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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
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"
63 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
65 { NORMAL, /* Ordinary declaration */
66 FUNCDEF, /* Function definition */
67 PARM, /* Declaration of parm before function body */
68 FIELD, /* Declaration inside struct or union */
69 TYPENAME}; /* Typename (inside cast or sizeof) */
72 /* Nonzero if we have seen an invalid cross reference
73 to a struct, union, or enum, but not yet printed the message. */
74 tree pending_invalid_xref;
76 /* File and line to appear in the eventual error message. */
77 location_t pending_invalid_xref_location;
79 /* True means we've initialized exception handling. */
80 bool c_eh_initialized_p;
82 /* While defining an enum type, this is 1 plus the last enumerator
83 constant value. Note that will do not have to save this or `enum_overflow'
84 around nested function definition since such a definition could only
85 occur in an enum value expression and we don't use these variables in
88 static tree enum_next_value;
90 /* Nonzero means that there was overflow computing enum_next_value. */
92 static int enum_overflow;
94 /* The file and line that the prototype came from if this is an
95 old-style definition; used for diagnostics in
96 store_parm_decls_oldstyle. */
98 static location_t current_function_prototype_locus;
100 /* The argument information structure for the function currently being
103 static struct c_arg_info *current_function_arg_info;
105 /* The obstack on which parser and related data structures, which are
106 not live beyond their top-level declaration or definition, are
108 struct obstack parser_obstack;
110 /* The current statement tree. */
112 static GTY(()) struct stmt_tree_s c_stmt_tree;
114 /* State saving variables. */
118 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
119 included in this invocation. Note that the current translation
120 unit is not included in this list. */
122 static GTY(()) tree all_translation_units;
124 /* A list of decls to be made automatically visible in each file scope. */
125 static GTY(()) tree visible_builtins;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a call to a noreturn function is seen. */
140 int current_function_returns_abnormally;
142 /* Set to nonzero by `grokdeclarator' for a function
143 whose return type is defaulted, if warnings for this are desired. */
145 static int warn_about_return_type;
147 /* Nonzero when starting a function declared `extern inline'. */
149 static int current_extern_inline;
151 /* True means global_bindings_p should return false even if the scope stack
152 says we are in file scope. */
153 bool c_override_global_bindings_to_false;
156 /* Each c_binding structure describes one binding of an identifier to
157 a decl. All the decls in a scope - irrespective of namespace - are
158 chained together by the ->prev field, which (as the name implies)
159 runs in reverse order. All the decls in a given namespace bound to
160 a given identifier are chained by the ->shadowed field, which runs
161 from inner to outer scopes.
163 The ->decl field usually points to a DECL node, but there are two
164 exceptions. In the namespace of type tags, the bound entity is a
165 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
166 identifier is encountered, it is bound to error_mark_node to
167 suppress further errors about that identifier in the current
170 The ->type field stores the type of the declaration in this scope;
171 if NULL, the type is the type of the ->decl field. This is only of
172 relevance for objects with external or internal linkage which may
173 be redeclared in inner scopes, forming composite types that only
174 persist for the duration of those scopes. In the external scope,
175 this stores the composite of all the types declared for this
176 object, visible or not. The ->inner_comp field (used only at file
177 scope) stores whether an incomplete array type at file scope was
178 completed at an inner scope to an array size other than 1.
180 The depth field is copied from the scope structure that holds this
181 decl. It is used to preserve the proper ordering of the ->shadowed
182 field (see bind()) and also for a handful of special-case checks.
183 Finally, the invisible bit is true for a decl which should be
184 ignored for purposes of normal name lookup, and the nested bit is
185 true for a decl that's been bound a second time in an inner scope;
186 in all such cases, the binding in the outer scope will have its
187 invisible bit true. */
189 struct c_binding GTY((chain_next ("%h.prev")))
191 tree decl; /* the decl bound */
192 tree type; /* the type in this scope */
193 tree id; /* the identifier it's bound to */
194 struct c_binding *prev; /* the previous decl in this scope */
195 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
196 unsigned int depth : 28; /* depth of this scope */
197 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
198 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
199 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
202 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
203 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
204 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
205 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
207 #define I_SYMBOL_BINDING(node) \
208 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->symbol_binding)
209 #define I_SYMBOL_DECL(node) \
210 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
212 #define I_TAG_BINDING(node) \
213 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->tag_binding)
214 #define I_TAG_DECL(node) \
215 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
217 #define I_LABEL_BINDING(node) \
218 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->label_binding)
219 #define I_LABEL_DECL(node) \
220 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
222 /* Each C symbol points to three linked lists of c_binding structures.
223 These describe the values of the identifier in the three different
224 namespaces defined by the language. */
226 struct lang_identifier GTY(())
228 struct c_common_identifier common_id;
229 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
230 struct c_binding *tag_binding; /* struct/union/enum tags */
231 struct c_binding *label_binding; /* labels */
234 /* Validate c-lang.c's assumptions. */
235 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
236 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
238 /* The resulting tree type. */
241 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
242 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *)TYPE_NEXT_VARIANT (&%h.generic) : (union lang_tree_node *)TREE_CHAIN (&%h.generic)")))
244 union tree_node GTY ((tag ("0"),
245 desc ("tree_node_structure (&%h)")))
247 struct lang_identifier GTY ((tag ("1"))) identifier;
250 /* Each c_scope structure describes the complete contents of one
251 scope. Four scopes are distinguished specially: the innermost or
252 current scope, the innermost function scope, the file scope (always
253 the second to outermost) and the outermost or external scope.
255 Most declarations are recorded in the current scope.
257 All normal label declarations are recorded in the innermost
258 function scope, as are bindings of undeclared identifiers to
259 error_mark_node. (GCC permits nested functions as an extension,
260 hence the 'innermost' qualifier.) Explicitly declared labels
261 (using the __label__ extension) appear in the current scope.
263 Being in the file scope (current_scope == file_scope) causes
264 special behavior in several places below. Also, under some
265 conditions the Objective-C front end records declarations in the
266 file scope even though that isn't the current scope.
268 All declarations with external linkage are recorded in the external
269 scope, even if they aren't visible there; this models the fact that
270 such declarations are visible to the entire program, and (with a
271 bit of cleverness, see pushdecl) allows diagnosis of some violations
272 of C99 6.2.2p7 and 6.2.7p2:
274 If, within the same translation unit, the same identifier appears
275 with both internal and external linkage, the behavior is
278 All declarations that refer to the same object or function shall
279 have compatible type; otherwise, the behavior is undefined.
281 Initially only the built-in declarations, which describe compiler
282 intrinsic functions plus a subset of the standard library, are in
285 The order of the blocks list matters, and it is frequently appended
286 to. To avoid having to walk all the way to the end of the list on
287 each insertion, or reverse the list later, we maintain a pointer to
288 the last list entry. (FIXME: It should be feasible to use a reversed
291 The bindings list is strictly in reverse order of declarations;
292 pop_scope relies on this. */
295 struct c_scope GTY((chain_next ("%h.outer")))
297 /* The scope containing this one. */
298 struct c_scope *outer;
300 /* The next outermost function scope. */
301 struct c_scope *outer_function;
303 /* All bindings in this scope. */
304 struct c_binding *bindings;
306 /* For each scope (except the global one), a chain of BLOCK nodes
307 for all the scopes that were entered and exited one level down. */
311 /* The depth of this scope. Used to keep the ->shadowed chain of
312 bindings sorted innermost to outermost. */
313 unsigned int depth : 28;
315 /* True if we are currently filling this scope with parameter
317 BOOL_BITFIELD parm_flag : 1;
319 /* True if we already complained about forward parameter decls
320 in this scope. This prevents double warnings on
321 foo (int a; int b; ...) */
322 BOOL_BITFIELD warned_forward_parm_decls : 1;
324 /* True if this is the outermost block scope of a function body.
325 This scope contains the parameters, the local variables declared
326 in the outermost block, and all the labels (except those in
327 nested functions, or declared at block scope with __label__). */
328 BOOL_BITFIELD function_body : 1;
330 /* True means make a BLOCK for this scope no matter what. */
331 BOOL_BITFIELD keep : 1;
334 /* The scope currently in effect. */
336 static GTY(()) struct c_scope *current_scope;
338 /* The innermost function scope. Ordinary (not explicitly declared)
339 labels, bindings to error_mark_node, and the lazily-created
340 bindings of __func__ and its friends get this scope. */
342 static GTY(()) struct c_scope *current_function_scope;
344 /* The C file scope. This is reset for each input translation unit. */
346 static GTY(()) struct c_scope *file_scope;
348 /* The outermost scope. This is used for all declarations with
349 external linkage, and only these, hence the name. */
351 static GTY(()) struct c_scope *external_scope;
353 /* A chain of c_scope structures awaiting reuse. */
355 static GTY((deletable)) struct c_scope *scope_freelist;
357 /* A chain of c_binding structures awaiting reuse. */
359 static GTY((deletable)) struct c_binding *binding_freelist;
361 /* Append VAR to LIST in scope SCOPE. */
362 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
363 struct c_scope *s_ = (scope); \
365 if (s_->list##_last) \
366 TREE_CHAIN (s_->list##_last) = d_; \
369 s_->list##_last = d_; \
372 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
373 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
374 struct c_scope *t_ = (tscope); \
375 struct c_scope *f_ = (fscope); \
377 TREE_CHAIN (t_->to##_last) = f_->from; \
380 t_->to##_last = f_->from##_last; \
383 /* True means unconditionally make a BLOCK for the next scope pushed. */
385 static bool keep_next_level_flag;
387 /* True means the next call to push_scope will be the outermost scope
388 of a function body, so do not push a new scope, merely cease
389 expecting parameter decls. */
391 static bool next_is_function_body;
393 /* Functions called automatically at the beginning and end of execution. */
395 static GTY(()) tree static_ctors;
396 static GTY(()) tree static_dtors;
398 /* Forward declarations. */
399 static tree lookup_name_in_scope (tree, struct c_scope *);
400 static tree c_make_fname_decl (tree, int);
401 static tree grokdeclarator (const struct c_declarator *,
402 struct c_declspecs *,
403 enum decl_context, bool, tree *);
404 static tree grokparms (struct c_arg_info *, bool);
405 static void layout_array_type (tree);
407 /* States indicating how grokdeclarator() should handle declspecs marked
408 with __attribute__((deprecated)). An object declared as
409 __attribute__((deprecated)) suppresses warnings of uses of other
412 enum deprecated_states {
417 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
420 c_print_identifier (FILE *file, tree node, int indent)
422 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
423 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
424 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
425 if (C_IS_RESERVED_WORD (node))
427 tree rid = ridpointers[C_RID_CODE (node)];
428 indent_to (file, indent + 4);
429 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
430 (void *) rid, IDENTIFIER_POINTER (rid));
434 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
435 which may be any of several kinds of DECL or TYPE or error_mark_node,
436 in the scope SCOPE. */
438 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
440 struct c_binding *b, **here;
442 if (binding_freelist)
444 b = binding_freelist;
445 binding_freelist = b->prev;
448 b = GGC_NEW (struct c_binding);
453 b->depth = scope->depth;
454 b->invisible = invisible;
460 b->prev = scope->bindings;
466 switch (TREE_CODE (decl))
468 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
471 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
477 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
483 /* Locate the appropriate place in the chain of shadowed decls
484 to insert this binding. Normally, scope == current_scope and
485 this does nothing. */
486 while (*here && (*here)->depth > scope->depth)
487 here = &(*here)->shadowed;
493 /* Clear the binding structure B, stick it on the binding_freelist,
494 and return the former value of b->prev. This is used by pop_scope
495 and get_parm_info to iterate destructively over all the bindings
496 from a given scope. */
497 static struct c_binding *
498 free_binding_and_advance (struct c_binding *b)
500 struct c_binding *prev = b->prev;
502 memset (b, 0, sizeof (struct c_binding));
503 b->prev = binding_freelist;
504 binding_freelist = b;
510 /* Hook called at end of compilation to assume 1 elt
511 for a file-scope tentative array defn that wasn't complete before. */
514 c_finish_incomplete_decl (tree decl)
516 if (TREE_CODE (decl) == VAR_DECL)
518 tree type = TREE_TYPE (decl);
519 if (type != error_mark_node
520 && TREE_CODE (type) == ARRAY_TYPE
521 && ! DECL_EXTERNAL (decl)
522 && TYPE_DOMAIN (type) == 0)
524 warning ("%Jarray '%D' assumed to have one element", decl, decl);
526 complete_array_type (type, NULL_TREE, 1);
528 layout_decl (decl, 0);
533 /* The Objective-C front-end often needs to determine the current scope. */
536 objc_get_current_scope (void)
538 return current_scope;
541 /* The following function is used only by Objective-C. It needs to live here
542 because it accesses the innards of c_scope. */
545 objc_mark_locals_volatile (void *enclosing_blk)
547 struct c_scope *scope;
550 for (scope = current_scope;
551 scope && scope != enclosing_blk;
552 scope = scope->outer)
554 for (b = scope->bindings; b; b = b->prev)
556 if (TREE_CODE (b->decl) == VAR_DECL
557 || TREE_CODE (b->decl) == PARM_DECL)
559 C_DECL_REGISTER (b->decl) = 0;
560 DECL_REGISTER (b->decl) = 0;
561 TREE_THIS_VOLATILE (b->decl) = 1;
565 /* Do not climb up past the current function. */
566 if (scope->function_body)
571 /* Nonzero if we are currently in file scope. */
574 global_bindings_p (void)
576 return current_scope == file_scope && !c_override_global_bindings_to_false;
580 keep_next_level (void)
582 keep_next_level_flag = true;
585 /* Identify this scope as currently being filled with parameters. */
588 declare_parm_level (void)
590 current_scope->parm_flag = true;
596 if (next_is_function_body)
598 /* This is the transition from the parameters to the top level
599 of the function body. These are the same scope
600 (C99 6.2.1p4,6) so we do not push another scope structure.
601 next_is_function_body is set only by store_parm_decls, which
602 in turn is called when and only when we are about to
603 encounter the opening curly brace for the function body.
605 The outermost block of a function always gets a BLOCK node,
606 because the debugging output routines expect that each
607 function has at least one BLOCK. */
608 current_scope->parm_flag = false;
609 current_scope->function_body = true;
610 current_scope->keep = true;
611 current_scope->outer_function = current_function_scope;
612 current_function_scope = current_scope;
614 keep_next_level_flag = false;
615 next_is_function_body = false;
619 struct c_scope *scope;
622 scope = scope_freelist;
623 scope_freelist = scope->outer;
626 scope = GGC_CNEW (struct c_scope);
628 scope->keep = keep_next_level_flag;
629 scope->outer = current_scope;
630 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
632 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
634 if (current_scope && scope->depth == 0)
637 sorry ("GCC supports only %u nested scopes\n", scope->depth);
640 current_scope = scope;
641 keep_next_level_flag = false;
645 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
648 set_type_context (tree type, tree context)
650 for (type = TYPE_MAIN_VARIANT (type); type;
651 type = TYPE_NEXT_VARIANT (type))
652 TYPE_CONTEXT (type) = context;
655 /* Exit a scope. Restore the state of the identifier-decl mappings
656 that were in effect when this scope was entered. Return a BLOCK
657 node containing all the DECLs in this scope that are of interest
658 to debug info generation. */
663 struct c_scope *scope = current_scope;
664 tree block, context, p;
667 bool functionbody = scope->function_body;
668 bool keep = functionbody || scope->keep || scope->bindings;
670 /* If appropriate, create a BLOCK to record the decls for the life
675 block = make_node (BLOCK);
676 BLOCK_SUBBLOCKS (block) = scope->blocks;
677 TREE_USED (block) = 1;
679 /* In each subblock, record that this is its superior. */
680 for (p = scope->blocks; p; p = TREE_CHAIN (p))
681 BLOCK_SUPERCONTEXT (p) = block;
683 BLOCK_VARS (block) = 0;
686 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
687 scope must be set so that they point to the appropriate
688 construct, i.e. either to the current FUNCTION_DECL node, or
689 else to the BLOCK node we just constructed.
691 Note that for tagged types whose scope is just the formal
692 parameter list for some function type specification, we can't
693 properly set their TYPE_CONTEXTs here, because we don't have a
694 pointer to the appropriate FUNCTION_TYPE node readily available
695 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
696 type nodes get set in `grokdeclarator' as soon as we have created
697 the FUNCTION_TYPE node which will represent the "scope" for these
698 "parameter list local" tagged types. */
699 if (scope->function_body)
700 context = current_function_decl;
701 else if (scope == file_scope)
703 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
704 TREE_CHAIN (file_decl) = all_translation_units;
705 all_translation_units = file_decl;
711 /* Clear all bindings in this scope. */
712 for (b = scope->bindings; b; b = free_binding_and_advance (b))
715 switch (TREE_CODE (p))
718 /* Warnings for unused labels, errors for undefined labels. */
719 if (TREE_USED (p) && !DECL_INITIAL (p))
721 error ("%Jlabel `%D' used but not defined", p, p);
722 DECL_INITIAL (p) = error_mark_node;
724 else if (!TREE_USED (p) && warn_unused_label)
726 if (DECL_INITIAL (p))
727 warning ("%Jlabel `%D' defined but not used", p, p);
729 warning ("%Jlabel `%D' declared but not defined", p, p);
731 /* Labels go in BLOCK_VARS. */
732 TREE_CHAIN (p) = BLOCK_VARS (block);
733 BLOCK_VARS (block) = p;
734 gcc_assert (I_LABEL_BINDING (b->id) == b);
735 I_LABEL_BINDING (b->id) = b->shadowed;
741 set_type_context (p, context);
743 /* Types may not have tag-names, in which case the type
744 appears in the bindings list with b->id NULL. */
747 gcc_assert (I_TAG_BINDING (b->id) == b);
748 I_TAG_BINDING (b->id) = b->shadowed;
753 /* Propagate TREE_ADDRESSABLE from nested functions to their
754 containing functions. */
755 if (! TREE_ASM_WRITTEN (p)
756 && DECL_INITIAL (p) != 0
757 && TREE_ADDRESSABLE (p)
758 && DECL_ABSTRACT_ORIGIN (p) != 0
759 && DECL_ABSTRACT_ORIGIN (p) != p)
760 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
764 /* Warnings for unused variables. */
765 if (warn_unused_variable
767 && !DECL_IN_SYSTEM_HEADER (p)
769 && !DECL_ARTIFICIAL (p)
770 && (scope != file_scope
771 || (TREE_STATIC (p) && !TREE_PUBLIC (p)
772 && !TREE_THIS_VOLATILE (p)))
773 && scope != external_scope)
774 warning ("%Junused variable `%D'", p, p);
778 error ("%Jtype of array %qD completed incompatibly with"
779 " implicit initialization", p, p);
786 /* All of these go in BLOCK_VARS, but only if this is the
787 binding in the home scope. */
790 TREE_CHAIN (p) = BLOCK_VARS (block);
791 BLOCK_VARS (block) = p;
793 /* If this is the file scope, and we are processing more
794 than one translation unit in this compilation, set
795 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
796 This makes same_translation_unit_p work, and causes
797 static declarations to be given disambiguating suffixes. */
798 if (scope == file_scope && num_in_fnames > 1)
800 DECL_CONTEXT (p) = context;
801 if (TREE_CODE (p) == TYPE_DECL)
802 set_type_context (TREE_TYPE (p), context);
806 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
807 already been put there by store_parm_decls. Unused-
808 parameter warnings are handled by function.c.
809 error_mark_node obviously does not go in BLOCK_VARS and
810 does not get unused-variable warnings. */
813 /* It is possible for a decl not to have a name. We get
814 here with b->id NULL in this case. */
817 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
818 I_SYMBOL_BINDING (b->id) = b->shadowed;
819 if (b->shadowed && b->shadowed->type)
820 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
830 /* Dispose of the block that we just made inside some higher level. */
831 if ((scope->function_body || scope == file_scope) && context)
833 DECL_INITIAL (context) = block;
834 BLOCK_SUPERCONTEXT (block) = context;
836 else if (scope->outer)
839 SCOPE_LIST_APPEND (scope->outer, blocks, block);
840 /* If we did not make a block for the scope just exited, any
841 blocks made for inner scopes must be carried forward so they
842 will later become subblocks of something else. */
843 else if (scope->blocks)
844 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
847 /* Pop the current scope, and free the structure for reuse. */
848 current_scope = scope->outer;
849 if (scope->function_body)
850 current_function_scope = scope->outer_function;
852 memset (scope, 0, sizeof (struct c_scope));
853 scope->outer = scope_freelist;
854 scope_freelist = scope;
860 push_file_scope (void)
868 file_scope = current_scope;
870 start_fname_decls ();
872 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
873 bind (DECL_NAME (decl), decl, file_scope,
874 /*invisible=*/false, /*nested=*/true);
878 pop_file_scope (void)
880 /* In case there were missing closebraces, get us back to the global
882 while (current_scope != file_scope)
885 /* __FUNCTION__ is defined at file scope (""). This
886 call may not be necessary as my tests indicate it
887 still works without it. */
888 finish_fname_decls ();
890 /* This is the point to write out a PCH if we're doing that.
891 In that case we do not want to do anything else. */
894 c_common_write_pch ();
898 /* Pop off the file scope and close this translation unit. */
901 cgraph_finalize_compilation_unit ();
904 /* Insert BLOCK at the end of the list of subblocks of the current
905 scope. This is used when a BIND_EXPR is expanded, to handle the
906 BLOCK node inside the BIND_EXPR. */
909 insert_block (tree block)
911 TREE_USED (block) = 1;
912 SCOPE_LIST_APPEND (current_scope, blocks, block);
915 /* Push a definition or a declaration of struct, union or enum tag "name".
916 "type" should be the type node.
917 We assume that the tag "name" is not already defined.
919 Note that the definition may really be just a forward reference.
920 In that case, the TYPE_SIZE will be zero. */
923 pushtag (tree name, tree type)
925 /* Record the identifier as the type's name if it has none. */
926 if (name && !TYPE_NAME (type))
927 TYPE_NAME (type) = name;
928 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
930 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
931 tagged type we just added to the current scope. This fake
932 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
933 to output a representation of a tagged type, and it also gives
934 us a convenient place to record the "scope start" address for the
937 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
939 /* An approximation for now, so we can tell this is a function-scope tag.
940 This will be updated in pop_scope. */
941 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
944 /* Subroutine of compare_decls. Allow harmless mismatches in return
945 and argument types provided that the type modes match. This function
946 return a unified type given a suitable match, and 0 otherwise. */
949 match_builtin_function_types (tree newtype, tree oldtype)
951 tree newrettype, oldrettype;
952 tree newargs, oldargs;
953 tree trytype, tryargs;
955 /* Accept the return type of the new declaration if same modes. */
956 oldrettype = TREE_TYPE (oldtype);
957 newrettype = TREE_TYPE (newtype);
959 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
962 oldargs = TYPE_ARG_TYPES (oldtype);
963 newargs = TYPE_ARG_TYPES (newtype);
966 while (oldargs || newargs)
970 || ! TREE_VALUE (oldargs)
971 || ! TREE_VALUE (newargs)
972 || TYPE_MODE (TREE_VALUE (oldargs))
973 != TYPE_MODE (TREE_VALUE (newargs)))
976 oldargs = TREE_CHAIN (oldargs);
977 newargs = TREE_CHAIN (newargs);
980 trytype = build_function_type (newrettype, tryargs);
981 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
984 /* Subroutine of diagnose_mismatched_decls. Check for function type
985 mismatch involving an empty arglist vs a nonempty one and give clearer
988 diagnose_arglist_conflict (tree newdecl, tree olddecl,
989 tree newtype, tree oldtype)
993 if (TREE_CODE (olddecl) != FUNCTION_DECL
994 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
995 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
997 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1000 t = TYPE_ARG_TYPES (oldtype);
1002 t = TYPE_ARG_TYPES (newtype);
1003 for (; t; t = TREE_CHAIN (t))
1005 tree type = TREE_VALUE (t);
1007 if (TREE_CHAIN (t) == 0
1008 && TYPE_MAIN_VARIANT (type) != void_type_node)
1010 inform ("a parameter list with an ellipsis can't match "
1011 "an empty parameter name list declaration");
1015 if (c_type_promotes_to (type) != type)
1017 inform ("an argument type that has a default promotion can't match "
1018 "an empty parameter name list declaration");
1024 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1025 old-style function definition, NEWDECL is a prototype declaration.
1026 Diagnose inconsistencies in the argument list. Returns TRUE if
1027 the prototype is compatible, FALSE if not. */
1029 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1031 tree newargs, oldargs;
1034 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
1035 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
1037 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1038 newargs = TYPE_ARG_TYPES (newtype);
1043 tree oldargtype = TREE_VALUE (oldargs);
1044 tree newargtype = TREE_VALUE (newargs);
1046 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1049 /* Reaching the end of just one list means the two decls don't
1050 agree on the number of arguments. */
1051 if (END_OF_ARGLIST (oldargtype))
1053 error ("%Jprototype for '%D' declares more arguments "
1054 "than previous old-style definition", newdecl, newdecl);
1057 else if (END_OF_ARGLIST (newargtype))
1059 error ("%Jprototype for '%D' declares fewer arguments "
1060 "than previous old-style definition", newdecl, newdecl);
1064 /* Type for passing arg must be consistent with that declared
1066 else if (! comptypes (oldargtype, newargtype))
1068 error ("%Jprototype for '%D' declares arg %d with incompatible type",
1069 newdecl, newdecl, i);
1073 oldargs = TREE_CHAIN (oldargs);
1074 newargs = TREE_CHAIN (newargs);
1078 /* If we get here, no errors were found, but do issue a warning
1079 for this poor-style construct. */
1080 warning ("%Jprototype for '%D' follows non-prototype definition",
1083 #undef END_OF_ARGLIST
1086 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1087 first in a pair of mismatched declarations, using the diagnostic
1090 locate_old_decl (tree decl, void (*diag)(const char *, ...))
1092 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1094 else if (DECL_INITIAL (decl))
1095 diag (N_("%Jprevious definition of '%D' was here"), decl, decl);
1096 else if (C_DECL_IMPLICIT (decl))
1097 diag (N_("%Jprevious implicit declaration of '%D' was here"), decl, decl);
1099 diag (N_("%Jprevious declaration of '%D' was here"), decl, decl);
1102 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1103 Returns true if the caller should proceed to merge the two, false
1104 if OLDDECL should simply be discarded. As a side effect, issues
1105 all necessary diagnostics for invalid or poor-style combinations.
1106 If it returns true, writes the types of NEWDECL and OLDDECL to
1107 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1108 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1111 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1112 tree *newtypep, tree *oldtypep)
1114 tree newtype, oldtype;
1115 bool pedwarned = false;
1116 bool warned = false;
1118 /* If we have error_mark_node for either decl or type, just discard
1119 the previous decl - we're in an error cascade already. */
1120 if (olddecl == error_mark_node || newdecl == error_mark_node)
1122 *oldtypep = oldtype = TREE_TYPE (olddecl);
1123 *newtypep = newtype = TREE_TYPE (newdecl);
1124 if (oldtype == error_mark_node || newtype == error_mark_node)
1127 /* Two different categories of symbol altogether. This is an error
1128 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1129 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1131 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1132 && DECL_BUILT_IN (olddecl)
1133 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1135 error ("%J'%D' redeclared as different kind of symbol",
1137 locate_old_decl (olddecl, error);
1139 else if (TREE_PUBLIC (newdecl))
1140 warning ("%Jbuilt-in function '%D' declared as non-function",
1142 else if (warn_shadow)
1143 warning ("%Jdeclaration of '%D' shadows a built-in function",
1148 if (!comptypes (oldtype, newtype))
1150 if (TREE_CODE (olddecl) == FUNCTION_DECL
1151 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1153 /* Accept harmless mismatch in function types.
1154 This is for the ffs and fprintf builtins. */
1155 tree trytype = match_builtin_function_types (newtype, oldtype);
1157 if (trytype && comptypes (newtype, trytype))
1158 *oldtypep = oldtype = trytype;
1161 /* If types don't match for a built-in, throw away the
1162 built-in. No point in calling locate_old_decl here, it
1163 won't print anything. */
1164 warning ("%Jconflicting types for built-in function '%D'",
1169 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1170 && DECL_IS_BUILTIN (olddecl))
1172 /* A conflicting function declaration for a predeclared
1173 function that isn't actually built in. Objective C uses
1174 these. The new declaration silently overrides everything
1175 but the volatility (i.e. noreturn) indication. See also
1176 below. FIXME: Make Objective C use normal builtins. */
1177 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1180 /* Permit void foo (...) to match int foo (...) if the latter is
1181 the definition and implicit int was used. See
1182 c-torture/compile/920625-2.c. */
1183 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1184 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1185 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1186 && C_FUNCTION_IMPLICIT_INT (newdecl))
1188 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
1189 /* Make sure we keep void as the return type. */
1190 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1191 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1196 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1197 error ("%J conflicting type qualifiers for '%D'", newdecl, newdecl);
1199 error ("%Jconflicting types for '%D'", newdecl, newdecl);
1200 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1201 locate_old_decl (olddecl, error);
1206 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1207 but silently ignore the redeclaration if either is in a system
1208 header. (Conflicting redeclarations were handled above.) */
1209 if (TREE_CODE (newdecl) == TYPE_DECL)
1211 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1212 return true; /* Allow OLDDECL to continue in use. */
1214 error ("%Jredefinition of typedef '%D'", newdecl, newdecl);
1215 locate_old_decl (olddecl, error);
1219 /* Function declarations can either be 'static' or 'extern' (no
1220 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1221 can never conflict with each other on account of linkage (6.2.2p4).
1222 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1223 two definitions if one is 'extern inline' and one is not. The non-
1224 extern-inline definition supersedes the extern-inline definition. */
1225 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1227 /* If you declare a built-in function name as static, or
1228 define the built-in with an old-style definition (so we
1229 can't validate the argument list) the built-in definition is
1230 overridden, but optionally warn this was a bad choice of name. */
1231 if (DECL_BUILT_IN (olddecl)
1232 && !C_DECL_DECLARED_BUILTIN (olddecl)
1233 && (!TREE_PUBLIC (newdecl)
1234 || (DECL_INITIAL (newdecl)
1235 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1238 warning ("%Jdeclaration of '%D' shadows a built-in function",
1240 /* Discard the old built-in function. */
1244 if (DECL_INITIAL (newdecl))
1246 if (DECL_INITIAL (olddecl)
1247 && !(DECL_DECLARED_INLINE_P (olddecl)
1248 && DECL_EXTERNAL (olddecl)
1249 && !(DECL_DECLARED_INLINE_P (newdecl)
1250 && DECL_EXTERNAL (newdecl)
1251 && same_translation_unit_p (olddecl, newdecl))))
1253 error ("%Jredefinition of '%D'", newdecl, newdecl);
1254 locate_old_decl (olddecl, error);
1258 /* If we have a prototype after an old-style function definition,
1259 the argument types must be checked specially. */
1260 else if (DECL_INITIAL (olddecl)
1261 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1262 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1263 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1265 locate_old_decl (olddecl, error);
1268 /* A non-static declaration (even an "extern") followed by a
1269 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1270 The same is true for a static forward declaration at block
1271 scope followed by a non-static declaration/definition at file
1272 scope. Static followed by non-static at the same scope is
1273 not undefined behavior, and is the most convenient way to get
1274 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1275 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1276 we do diagnose it if -Wtraditional. */
1277 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1279 /* Two exceptions to the rule. If olddecl is an extern
1280 inline, or a predeclared function that isn't actually
1281 built in, newdecl silently overrides olddecl. The latter
1282 occur only in Objective C; see also above. (FIXME: Make
1283 Objective C use normal builtins.) */
1284 if (!DECL_IS_BUILTIN (olddecl)
1285 && !(DECL_EXTERNAL (olddecl)
1286 && DECL_DECLARED_INLINE_P (olddecl)))
1288 error ("%Jstatic declaration of '%D' follows "
1289 "non-static declaration", newdecl, newdecl);
1290 locate_old_decl (olddecl, error);
1294 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1296 if (DECL_CONTEXT (olddecl))
1298 error ("%Jnon-static declaration of '%D' follows "
1299 "static declaration", newdecl, newdecl);
1300 locate_old_decl (olddecl, error);
1303 else if (warn_traditional)
1305 warning ("%Jnon-static declaration of '%D' follows "
1306 "static declaration", newdecl, newdecl);
1311 else if (TREE_CODE (newdecl) == VAR_DECL)
1313 /* Only variables can be thread-local, and all declarations must
1314 agree on this property. */
1315 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1317 if (DECL_THREAD_LOCAL (newdecl))
1318 error ("%Jthread-local declaration of '%D' follows "
1319 "non-thread-local declaration", newdecl, newdecl);
1321 error ("%Jnon-thread-local declaration of '%D' follows "
1322 "thread-local declaration", newdecl, newdecl);
1324 locate_old_decl (olddecl, error);
1328 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1329 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1331 error ("%Jredefinition of '%D'", newdecl, newdecl);
1332 locate_old_decl (olddecl, error);
1336 /* Objects declared at file scope: if the first declaration had
1337 external linkage (even if it was an external reference) the
1338 second must have external linkage as well, or the behavior is
1339 undefined. If the first declaration had internal linkage, then
1340 the second must too, or else be an external reference (in which
1341 case the composite declaration still has internal linkage).
1342 As for function declarations, we warn about the static-then-
1343 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1344 if (DECL_FILE_SCOPE_P (newdecl)
1345 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1347 if (DECL_EXTERNAL (newdecl))
1349 if (!DECL_FILE_SCOPE_P (olddecl))
1351 error ("%Jextern declaration of %qD follows "
1352 "declaration with no linkage", newdecl, newdecl);
1353 locate_old_decl (olddecl, error);
1356 else if (warn_traditional)
1358 warning ("%Jnon-static declaration of '%D' follows "
1359 "static declaration", newdecl, newdecl);
1365 if (TREE_PUBLIC (newdecl))
1366 error ("%Jnon-static declaration of '%D' follows "
1367 "static declaration", newdecl, newdecl);
1369 error ("%Jstatic declaration of '%D' follows "
1370 "non-static declaration", newdecl, newdecl);
1372 locate_old_decl (olddecl, error);
1376 /* Two objects with the same name declared at the same block
1377 scope must both be external references (6.7p3). */
1378 else if (!DECL_FILE_SCOPE_P (newdecl))
1380 if (DECL_EXTERNAL (newdecl))
1382 /* Extern with initializer at block scope, which will
1383 already have received an error. */
1385 else if (DECL_EXTERNAL (olddecl))
1387 error ("%Jdeclaration of '%D' with no linkage follows "
1388 "extern declaration", newdecl, newdecl);
1389 locate_old_decl (olddecl, error);
1393 error ("%Jredeclaration of '%D' with no linkage",
1395 locate_old_decl (olddecl, error);
1403 /* All decls must agree on a visibility. */
1404 if (DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1405 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1407 warning ("%Jredeclaration of '%D' with different visibility "
1408 "(old visibility preserved)", newdecl, newdecl);
1412 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1414 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1415 if (DECL_DECLARED_INLINE_P (newdecl)
1416 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1418 warning ("%Jinline declaration of '%D' follows "
1419 "declaration with attribute noinline", newdecl, newdecl);
1422 else if (DECL_DECLARED_INLINE_P (olddecl)
1423 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1425 warning ("%Jdeclaration of '%D' with attribute noinline follows "
1426 "inline declaration ", newdecl, newdecl);
1430 /* Inline declaration after use or definition.
1431 ??? Should we still warn about this now we have unit-at-a-time
1432 mode and can get it right?
1433 Definitely don't complain if the decls are in different translation
1435 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1436 && same_translation_unit_p (olddecl, newdecl))
1438 if (TREE_USED (olddecl))
1440 warning ("%J'%D' declared inline after being called",
1444 else if (DECL_INITIAL (olddecl))
1446 warning ("%J'%D' declared inline after its definition",
1452 else /* PARM_DECL, VAR_DECL */
1454 /* Redeclaration of a parameter is a constraint violation (this is
1455 not explicitly stated, but follows from C99 6.7p3 [no more than
1456 one declaration of the same identifier with no linkage in the
1457 same scope, except type tags] and 6.2.2p6 [parameters have no
1458 linkage]). We must check for a forward parameter declaration,
1459 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1460 an extension, the mandatory diagnostic for which is handled by
1461 mark_forward_parm_decls. */
1463 if (TREE_CODE (newdecl) == PARM_DECL
1464 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1466 error ("%Jredefinition of parameter '%D'", newdecl, newdecl);
1467 locate_old_decl (olddecl, error);
1472 /* Optional warning for completely redundant decls. */
1473 if (!warned && !pedwarned
1474 && warn_redundant_decls
1475 /* Don't warn about a function declaration followed by a
1477 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1478 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1479 /* Don't warn about redundant redeclarations of builtins. */
1480 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1481 && !DECL_BUILT_IN (newdecl)
1482 && DECL_BUILT_IN (olddecl)
1483 && !C_DECL_DECLARED_BUILTIN (olddecl))
1484 /* Don't warn about an extern followed by a definition. */
1485 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1486 /* Don't warn about forward parameter decls. */
1487 && !(TREE_CODE (newdecl) == PARM_DECL
1488 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1490 warning ("%Jredundant redeclaration of '%D'", newdecl, newdecl);
1494 /* Report location of previous decl/defn in a consistent manner. */
1495 if (warned || pedwarned)
1496 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1501 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1502 consistent with OLDDECL, but carries new information. Merge the
1503 new information into OLDDECL. This function issues no
1507 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1509 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1510 && DECL_INITIAL (newdecl) != 0);
1512 /* For real parm decl following a forward decl, rechain the old decl
1513 in its new location and clear TREE_ASM_WRITTEN (it's not a
1514 forward decl anymore). */
1515 if (TREE_CODE (newdecl) == PARM_DECL
1516 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1518 struct c_binding *b, **here;
1520 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1521 if ((*here)->decl == olddecl)
1528 b->prev = current_scope->bindings;
1529 current_scope->bindings = b;
1531 TREE_ASM_WRITTEN (olddecl) = 0;
1534 DECL_ATTRIBUTES (newdecl)
1535 = targetm.merge_decl_attributes (olddecl, newdecl);
1537 /* Merge the data types specified in the two decls. */
1539 = TREE_TYPE (olddecl)
1540 = composite_type (newtype, oldtype);
1542 /* Lay the type out, unless already done. */
1543 if (oldtype != TREE_TYPE (newdecl))
1545 if (TREE_TYPE (newdecl) != error_mark_node)
1546 layout_type (TREE_TYPE (newdecl));
1547 if (TREE_CODE (newdecl) != FUNCTION_DECL
1548 && TREE_CODE (newdecl) != TYPE_DECL
1549 && TREE_CODE (newdecl) != CONST_DECL)
1550 layout_decl (newdecl, 0);
1554 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1555 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1556 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1557 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1558 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1559 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1561 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1562 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1566 /* Keep the old rtl since we can safely use it. */
1567 COPY_DECL_RTL (olddecl, newdecl);
1569 /* Merge the type qualifiers. */
1570 if (TREE_READONLY (newdecl))
1571 TREE_READONLY (olddecl) = 1;
1573 if (TREE_THIS_VOLATILE (newdecl))
1575 TREE_THIS_VOLATILE (olddecl) = 1;
1576 if (TREE_CODE (newdecl) == VAR_DECL)
1577 make_var_volatile (newdecl);
1580 /* Keep source location of definition rather than declaration. */
1581 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1582 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1584 /* Merge the unused-warning information. */
1585 if (DECL_IN_SYSTEM_HEADER (olddecl))
1586 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1587 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1588 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1590 /* Merge the initialization information. */
1591 if (DECL_INITIAL (newdecl) == 0)
1592 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1594 /* Merge the section attribute.
1595 We want to issue an error if the sections conflict but that must be
1596 done later in decl_attributes since we are called before attributes
1598 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1599 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1601 /* Copy the assembler name.
1602 Currently, it can only be defined in the prototype. */
1603 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1605 /* Use visibility of whichever declaration had it specified */
1606 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1608 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1609 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1612 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1614 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1615 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1616 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1617 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1618 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1619 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1620 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1621 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1622 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1625 /* Merge the storage class information. */
1626 merge_weak (newdecl, olddecl);
1628 /* For functions, static overrides non-static. */
1629 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1631 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1632 /* This is since we don't automatically
1633 copy the attributes of NEWDECL into OLDDECL. */
1634 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1635 /* If this clears `static', clear it in the identifier too. */
1636 if (! TREE_PUBLIC (olddecl))
1637 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1639 if (DECL_EXTERNAL (newdecl))
1641 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1642 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1644 /* An extern decl does not override previous storage class. */
1645 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1646 if (! DECL_EXTERNAL (newdecl))
1648 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1649 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1654 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1655 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1658 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1660 /* If we're redefining a function previously defined as extern
1661 inline, make sure we emit debug info for the inline before we
1662 throw it away, in case it was inlined into a function that hasn't
1663 been written out yet. */
1664 if (new_is_definition && DECL_INITIAL (olddecl))
1666 if (TREE_USED (olddecl)
1667 /* In unit-at-a-time mode we never inline re-defined extern
1668 inline functions. */
1669 && !flag_unit_at_a_time
1670 && cgraph_function_possibly_inlined_p (olddecl))
1671 (*debug_hooks->outlining_inline_function) (olddecl);
1673 /* The new defn must not be inline. */
1674 DECL_INLINE (newdecl) = 0;
1675 DECL_UNINLINABLE (newdecl) = 1;
1679 /* If either decl says `inline', this fn is inline,
1680 unless its definition was passed already. */
1681 if (DECL_DECLARED_INLINE_P (newdecl)
1682 || DECL_DECLARED_INLINE_P (olddecl))
1683 DECL_DECLARED_INLINE_P (newdecl) = 1;
1685 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1686 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1689 if (DECL_BUILT_IN (olddecl))
1691 /* If redeclaring a builtin function, it stays built in.
1692 But it gets tagged as having been declared. */
1693 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1694 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1695 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1698 /* Also preserve various other info from the definition. */
1699 if (! new_is_definition)
1701 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1702 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1703 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1704 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1705 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1707 /* Set DECL_INLINE on the declaration if we've got a body
1708 from which to instantiate. */
1709 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1711 DECL_INLINE (newdecl) = 1;
1712 DECL_ABSTRACT_ORIGIN (newdecl)
1713 = DECL_ABSTRACT_ORIGIN (olddecl);
1718 /* If a previous declaration said inline, mark the
1719 definition as inlinable. */
1720 if (DECL_DECLARED_INLINE_P (newdecl)
1721 && ! DECL_UNINLINABLE (newdecl))
1722 DECL_INLINE (newdecl) = 1;
1726 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1727 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1729 unsigned olddecl_uid = DECL_UID (olddecl);
1730 tree olddecl_context = DECL_CONTEXT (olddecl);
1732 memcpy ((char *) olddecl + sizeof (struct tree_common),
1733 (char *) newdecl + sizeof (struct tree_common),
1734 sizeof (struct tree_decl) - sizeof (struct tree_common));
1735 DECL_UID (olddecl) = olddecl_uid;
1736 DECL_CONTEXT (olddecl) = olddecl_context;
1739 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1740 so that encode_section_info has a chance to look at the new decl
1741 flags and attributes. */
1742 if (DECL_RTL_SET_P (olddecl)
1743 && (TREE_CODE (olddecl) == FUNCTION_DECL
1744 || (TREE_CODE (olddecl) == VAR_DECL
1745 && TREE_STATIC (olddecl))))
1746 make_decl_rtl (olddecl);
1749 /* Handle when a new declaration NEWDECL has the same name as an old
1750 one OLDDECL in the same binding contour. Prints an error message
1753 If safely possible, alter OLDDECL to look like NEWDECL, and return
1754 true. Otherwise, return false. */
1757 duplicate_decls (tree newdecl, tree olddecl)
1759 tree newtype = NULL, oldtype = NULL;
1761 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1764 merge_decls (newdecl, olddecl, newtype, oldtype);
1769 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1771 warn_if_shadowing (tree new_decl)
1773 struct c_binding *b;
1775 /* Shadow warnings wanted? */
1777 /* No shadow warnings for internally generated vars. */
1778 || DECL_IS_BUILTIN (new_decl)
1779 /* No shadow warnings for vars made for inlining. */
1780 || DECL_FROM_INLINE (new_decl)
1781 /* Don't warn about the parm names in function declarator
1782 within a function declarator. It would be nice to avoid
1783 warning in any function declarator in a declaration, as
1784 opposed to a definition, but there is no way to tell
1785 it's not a definition at this point. */
1786 || (TREE_CODE (new_decl) == PARM_DECL && current_scope->outer->parm_flag))
1789 /* Is anything being shadowed? Invisible decls do not count. */
1790 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1791 if (b->decl && b->decl != new_decl && !b->invisible)
1793 tree old_decl = b->decl;
1795 if (TREE_CODE (old_decl) == PARM_DECL)
1796 warning ("%Jdeclaration of '%D' shadows a parameter",
1797 new_decl, new_decl);
1798 else if (DECL_FILE_SCOPE_P (old_decl))
1799 warning ("%Jdeclaration of '%D' shadows a global declaration",
1800 new_decl, new_decl);
1801 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1802 && DECL_BUILT_IN (old_decl))
1803 warning ("%Jdeclaration of '%D' shadows a built-in function",
1804 new_decl, new_decl);
1806 warning ("%Jdeclaration of '%D' shadows a previous local",
1807 new_decl, new_decl);
1809 if (TREE_CODE (old_decl) != FUNCTION_DECL
1810 || ! DECL_BUILT_IN (old_decl))
1811 warning ("%Jshadowed declaration is here", old_decl);
1818 /* Subroutine of pushdecl.
1820 X is a TYPE_DECL for a typedef statement. Create a brand new
1821 ..._TYPE node (which will be just a variant of the existing
1822 ..._TYPE node with identical properties) and then install X
1823 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1825 The whole point here is to end up with a situation where each
1826 and every ..._TYPE node the compiler creates will be uniquely
1827 associated with AT MOST one node representing a typedef name.
1828 This way, even though the compiler substitutes corresponding
1829 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1830 early on, later parts of the compiler can always do the reverse
1831 translation and get back the corresponding typedef name. For
1834 typedef struct S MY_TYPE;
1837 Later parts of the compiler might only know that `object' was of
1838 type `struct S' if it were not for code just below. With this
1839 code however, later parts of the compiler see something like:
1841 struct S' == struct S
1842 typedef struct S' MY_TYPE;
1845 And they can then deduce (from the node for type struct S') that
1846 the original object declaration was:
1850 Being able to do this is important for proper support of protoize,
1851 and also for generating precise symbolic debugging information
1852 which takes full account of the programmer's (typedef) vocabulary.
1854 Obviously, we don't want to generate a duplicate ..._TYPE node if
1855 the TYPE_DECL node that we are now processing really represents a
1856 standard built-in type.
1858 Since all standard types are effectively declared at line zero
1859 in the source file, we can easily check to see if we are working
1860 on a standard type by checking the current value of lineno. */
1863 clone_underlying_type (tree x)
1865 if (DECL_IS_BUILTIN (x))
1867 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1868 TYPE_NAME (TREE_TYPE (x)) = x;
1870 else if (TREE_TYPE (x) != error_mark_node
1871 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1873 tree tt = TREE_TYPE (x);
1874 DECL_ORIGINAL_TYPE (x) = tt;
1875 tt = build_variant_type_copy (tt);
1877 TREE_USED (tt) = TREE_USED (x);
1882 /* Record a decl-node X as belonging to the current lexical scope.
1883 Check for errors (such as an incompatible declaration for the same
1884 name already seen in the same scope).
1886 Returns either X or an old decl for the same name.
1887 If an old decl is returned, it may have been smashed
1888 to agree with what X says. */
1893 tree name = DECL_NAME (x);
1894 struct c_scope *scope = current_scope;
1895 struct c_binding *b;
1896 bool nested = false;
1898 /* Functions need the lang_decl data. */
1899 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1900 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
1902 /* Must set DECL_CONTEXT for everything not at file scope or
1903 DECL_FILE_SCOPE_P won't work. Local externs don't count
1904 unless they have initializers (which generate code). */
1905 if (current_function_decl
1906 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
1907 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
1908 DECL_CONTEXT (x) = current_function_decl;
1910 /* Anonymous decls are just inserted in the scope. */
1913 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
1917 /* First, see if there is another declaration with the same name in
1918 the current scope. If there is, duplicate_decls may do all the
1919 work for us. If duplicate_decls returns false, that indicates
1920 two incompatible decls in the same scope; we are to silently
1921 replace the old one (duplicate_decls has issued all appropriate
1922 diagnostics). In particular, we should not consider possible
1923 duplicates in the external scope, or shadowing. */
1924 b = I_SYMBOL_BINDING (name);
1925 if (b && B_IN_SCOPE (b, scope))
1927 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
1928 && COMPLETE_TYPE_P (TREE_TYPE (x)))
1929 b->inner_comp = false;
1930 if (duplicate_decls (x, b->decl))
1933 goto skip_external_and_shadow_checks;
1936 /* All declarations with external linkage, and all external
1937 references, go in the external scope, no matter what scope is
1938 current. However, the binding in that scope is ignored for
1939 purposes of normal name lookup. A separate binding structure is
1940 created in the requested scope; this governs the normal
1941 visibility of the symbol.
1943 The binding in the externals scope is used exclusively for
1944 detecting duplicate declarations of the same object, no matter
1945 what scope they are in; this is what we do here. (C99 6.2.7p2:
1946 All declarations that refer to the same object or function shall
1947 have compatible type; otherwise, the behavior is undefined.) */
1948 if (DECL_EXTERNAL (x) || scope == file_scope)
1950 tree type = TREE_TYPE (x);
1953 bool type_saved = false;
1954 if (b && !B_IN_EXTERNAL_SCOPE (b)
1955 && (TREE_CODE (b->decl) == FUNCTION_DECL
1956 || TREE_CODE (b->decl) == VAR_DECL)
1957 && DECL_FILE_SCOPE_P (b->decl))
1960 vistype = TREE_TYPE (visdecl);
1962 if (warn_nested_externs
1963 && scope != file_scope
1964 && !DECL_IN_SYSTEM_HEADER (x))
1965 warning ("nested extern declaration of '%D'", x);
1967 while (b && !B_IN_EXTERNAL_SCOPE (b))
1969 /* If this decl might be modified, save its type. This is
1970 done here rather than when the decl is first bound
1971 because the type may change after first binding, through
1972 being completed or through attributes being added. If we
1973 encounter multiple such decls, only the first should have
1974 its type saved; the others will already have had their
1975 proper types saved and the types will not have changed as
1976 their scopes will not have been re-entered. */
1977 if (DECL_FILE_SCOPE_P (b->decl) && !type_saved)
1979 b->type = TREE_TYPE (b->decl);
1982 if (B_IN_FILE_SCOPE (b)
1983 && TREE_CODE (b->decl) == VAR_DECL
1984 && TREE_STATIC (b->decl)
1985 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
1986 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
1987 && TREE_CODE (type) == ARRAY_TYPE
1988 && TYPE_DOMAIN (type)
1989 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
1990 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
1992 /* Array type completed in inner scope, which should be
1993 diagnosed if the completion does not have size 1 and
1994 it does not get completed in the file scope. */
1995 b->inner_comp = true;
2000 /* If a matching external declaration has been found, set its
2001 type to the composite of all the types of that declaration.
2002 After the consistency checks, it will be reset to the
2003 composite of the visible types only. */
2004 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2006 TREE_TYPE (b->decl) = b->type;
2008 /* The point of the same_translation_unit_p check here is,
2009 we want to detect a duplicate decl for a construct like
2010 foo() { extern bar(); } ... static bar(); but not if
2011 they are in different translation units. In any case,
2012 the static does not go in the externals scope. */
2014 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2015 && duplicate_decls (x, b->decl))
2018 thistype = (vistype ? composite_type (vistype, type) : type);
2019 b->type = TREE_TYPE (b->decl);
2020 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2022 = build_type_attribute_variant (thistype,
2023 TYPE_ATTRIBUTES (b->type));
2024 TREE_TYPE (b->decl) = thistype;
2025 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2028 else if (TREE_PUBLIC (x))
2030 if (visdecl && !b && duplicate_decls (x, visdecl))
2032 /* An external declaration at block scope referring to a
2033 visible entity with internal linkage. The composite
2034 type will already be correct for this scope, so we
2035 just need to fall through to make the declaration in
2041 bind (name, x, external_scope, /*invisible=*/true,
2047 /* Similarly, a declaration of a function with static linkage at
2048 block scope must be checked against any existing declaration
2049 of that function at file scope. */
2050 else if (TREE_CODE (x) == FUNCTION_DECL && scope != file_scope
2051 && !TREE_PUBLIC (x) && !DECL_INITIAL (x))
2053 if (warn_nested_externs && !DECL_IN_SYSTEM_HEADER (x))
2054 warning ("nested static declaration of '%D'", x);
2056 while (b && !B_IN_FILE_SCOPE (b))
2059 if (b && same_translation_unit_p (x, b->decl)
2060 && duplicate_decls (x, b->decl))
2062 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2067 bind (name, x, file_scope, /*invisible=*/true, /*nested=*/false);
2072 warn_if_shadowing (x);
2074 skip_external_and_shadow_checks:
2075 if (TREE_CODE (x) == TYPE_DECL)
2076 clone_underlying_type (x);
2078 bind (name, x, scope, /*invisible=*/false, nested);
2080 /* If x's type is incomplete because it's based on a
2081 structure or union which has not yet been fully declared,
2082 attach it to that structure or union type, so we can go
2083 back and complete the variable declaration later, if the
2084 structure or union gets fully declared.
2086 If the input is erroneous, we can have error_mark in the type
2087 slot (e.g. "f(void a, ...)") - that doesn't count as an
2089 if (TREE_TYPE (x) != error_mark_node
2090 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2092 tree element = TREE_TYPE (x);
2094 while (TREE_CODE (element) == ARRAY_TYPE)
2095 element = TREE_TYPE (element);
2096 element = TYPE_MAIN_VARIANT (element);
2098 if ((TREE_CODE (element) == RECORD_TYPE
2099 || TREE_CODE (element) == UNION_TYPE)
2100 && (TREE_CODE (x) != TYPE_DECL
2101 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2102 && !COMPLETE_TYPE_P (element))
2103 C_TYPE_INCOMPLETE_VARS (element)
2104 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2109 /* Record X as belonging to file scope.
2110 This is used only internally by the Objective-C front end,
2111 and is limited to its needs. duplicate_decls is not called;
2112 if there is any preexisting decl for this identifier, it is an ICE. */
2115 pushdecl_top_level (tree x)
2118 bool nested = false;
2120 gcc_assert (TREE_CODE (x) == VAR_DECL);
2122 name = DECL_NAME (x);
2124 gcc_assert (!I_SYMBOL_BINDING (name));
2126 if (TREE_PUBLIC (x))
2128 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2132 bind (name, x, file_scope, /*invisible=*/false, nested);
2138 implicit_decl_warning (tree id, tree olddecl)
2140 void (*diag) (const char *, ...);
2141 switch (mesg_implicit_function_declaration)
2144 case 1: diag = warning; break;
2145 case 2: diag = error; break;
2146 default: gcc_unreachable ();
2149 diag (N_("implicit declaration of function '%E'"), id);
2151 locate_old_decl (olddecl, diag);
2154 /* Generate an implicit declaration for identifier FUNCTIONID as a
2155 function of type int (). */
2158 implicitly_declare (tree functionid)
2160 struct c_binding *b;
2162 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2164 if (B_IN_SCOPE (b, external_scope))
2173 /* FIXME: Objective-C has weird not-really-builtin functions
2174 which are supposed to be visible automatically. They wind up
2175 in the external scope because they're pushed before the file
2176 scope gets created. Catch this here and rebind them into the
2178 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2180 bind (functionid, decl, file_scope,
2181 /*invisible=*/false, /*nested=*/true);
2186 tree newtype = default_function_type;
2188 TREE_TYPE (decl) = b->type;
2189 /* Implicit declaration of a function already declared
2190 (somehow) in a different scope, or as a built-in.
2191 If this is the first time this has happened, warn;
2192 then recycle the old declaration but with the new type. */
2193 if (!C_DECL_IMPLICIT (decl))
2195 implicit_decl_warning (functionid, decl);
2196 C_DECL_IMPLICIT (decl) = 1;
2198 if (DECL_BUILT_IN (decl))
2200 newtype = build_type_attribute_variant (newtype,
2202 (TREE_TYPE (decl)));
2203 if (!comptypes (newtype, TREE_TYPE (decl)))
2205 warning ("incompatible implicit declaration of built-in"
2206 " function %qD", decl);
2207 newtype = TREE_TYPE (decl);
2212 if (!comptypes (newtype, TREE_TYPE (decl)))
2214 error ("incompatible implicit declaration of function %qD",
2216 locate_old_decl (decl, error);
2219 b->type = TREE_TYPE (decl);
2220 TREE_TYPE (decl) = newtype;
2221 bind (functionid, decl, current_scope,
2222 /*invisible=*/false, /*nested=*/true);
2227 /* Not seen before. */
2228 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2229 DECL_EXTERNAL (decl) = 1;
2230 TREE_PUBLIC (decl) = 1;
2231 C_DECL_IMPLICIT (decl) = 1;
2232 implicit_decl_warning (functionid, 0);
2234 /* C89 says implicit declarations are in the innermost block.
2235 So we record the decl in the standard fashion. */
2236 decl = pushdecl (decl);
2238 /* No need to call objc_check_decl here - it's a function type. */
2239 rest_of_decl_compilation (decl, 0, 0);
2241 /* Write a record describing this implicit function declaration
2242 to the prototypes file (if requested). */
2243 gen_aux_info_record (decl, 0, 1, 0);
2245 /* Possibly apply some default attributes to this implicit declaration. */
2246 decl_attributes (&decl, NULL_TREE, 0);
2251 /* Issue an error message for a reference to an undeclared variable
2252 ID, including a reference to a builtin outside of function-call
2253 context. Establish a binding of the identifier to error_mark_node
2254 in an appropriate scope, which will suppress further errors for the
2257 undeclared_variable (tree id)
2259 static bool already = false;
2260 struct c_scope *scope;
2262 if (current_function_decl == 0)
2264 error ("'%E' undeclared here (not in a function)", id);
2265 scope = current_scope;
2269 error ("'%E' undeclared (first use in this function)", id);
2273 error ("(Each undeclared identifier is reported only once");
2274 error ("for each function it appears in.)");
2278 /* If we are parsing old-style parameter decls, current_function_decl
2279 will be nonnull but current_function_scope will be null. */
2280 scope = current_function_scope ? current_function_scope : current_scope;
2282 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2285 /* Subroutine of lookup_label, declare_label, define_label: construct a
2286 LABEL_DECL with all the proper frills. */
2289 make_label (tree name, location_t location)
2291 tree label = build_decl (LABEL_DECL, name, void_type_node);
2293 DECL_CONTEXT (label) = current_function_decl;
2294 DECL_MODE (label) = VOIDmode;
2295 DECL_SOURCE_LOCATION (label) = location;
2300 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2301 Create one if none exists so far for the current function.
2302 This is called when a label is used in a goto expression or
2303 has its address taken. */
2306 lookup_label (tree name)
2310 if (current_function_decl == 0)
2312 error ("label %s referenced outside of any function",
2313 IDENTIFIER_POINTER (name));
2317 /* Use a label already defined or ref'd with this name, but not if
2318 it is inherited from a containing function and wasn't declared
2320 label = I_LABEL_DECL (name);
2321 if (label && (DECL_CONTEXT (label) == current_function_decl
2322 || C_DECLARED_LABEL_FLAG (label)))
2324 /* If the label has only been declared, update its apparent
2325 location to point here, for better diagnostics if it
2326 turns out not to have been defined. */
2327 if (!TREE_USED (label))
2328 DECL_SOURCE_LOCATION (label) = input_location;
2332 /* No label binding for that identifier; make one. */
2333 label = make_label (name, input_location);
2335 /* Ordinary labels go in the current function scope. */
2336 bind (name, label, current_function_scope,
2337 /*invisible=*/false, /*nested=*/false);
2341 /* Make a label named NAME in the current function, shadowing silently
2342 any that may be inherited from containing functions or containing
2343 scopes. This is called for __label__ declarations. */
2346 declare_label (tree name)
2348 struct c_binding *b = I_LABEL_BINDING (name);
2351 /* Check to make sure that the label hasn't already been declared
2353 if (b && B_IN_CURRENT_SCOPE (b))
2355 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2356 locate_old_decl (b->decl, error);
2358 /* Just use the previous declaration. */
2362 label = make_label (name, input_location);
2363 C_DECLARED_LABEL_FLAG (label) = 1;
2365 /* Declared labels go in the current scope. */
2366 bind (name, label, current_scope,
2367 /*invisible=*/false, /*nested=*/false);
2371 /* Define a label, specifying the location in the source file.
2372 Return the LABEL_DECL node for the label, if the definition is valid.
2373 Otherwise return 0. */
2376 define_label (location_t location, tree name)
2378 /* Find any preexisting label with this name. It is an error
2379 if that label has already been defined in this function, or
2380 if there is a containing function with a declared label with
2382 tree label = I_LABEL_DECL (name);
2385 && ((DECL_CONTEXT (label) == current_function_decl
2386 && DECL_INITIAL (label) != 0)
2387 || (DECL_CONTEXT (label) != current_function_decl
2388 && C_DECLARED_LABEL_FLAG (label))))
2390 error ("%Hduplicate label `%D'", &location, label);
2391 locate_old_decl (label, error);
2394 else if (label && DECL_CONTEXT (label) == current_function_decl)
2396 /* The label has been used or declared already in this function,
2397 but not defined. Update its location to point to this
2399 DECL_SOURCE_LOCATION (label) = location;
2403 /* No label binding for that identifier; make one. */
2404 label = make_label (name, location);
2406 /* Ordinary labels go in the current function scope. */
2407 bind (name, label, current_function_scope,
2408 /*invisible=*/false, /*nested=*/false);
2411 if (warn_traditional && !in_system_header && lookup_name (name))
2412 warning ("%Htraditional C lacks a separate namespace for labels, "
2413 "identifier `%s' conflicts", &location,
2414 IDENTIFIER_POINTER (name));
2416 /* Mark label as having been defined. */
2417 DECL_INITIAL (label) = error_mark_node;
2421 /* Given NAME, an IDENTIFIER_NODE,
2422 return the structure (or union or enum) definition for that name.
2423 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2424 CODE says which kind of type the caller wants;
2425 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2426 If the wrong kind of type is found, an error is reported. */
2429 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2431 struct c_binding *b = I_TAG_BINDING (name);
2437 /* We only care about whether it's in this level if
2438 thislevel_only was set or it might be a type clash. */
2439 if (thislevel_only || TREE_CODE (b->decl) != code)
2441 /* For our purposes, a tag in the external scope is the same as
2442 a tag in the file scope. (Primarily relevant to Objective-C
2443 and its builtin structure tags, which get pushed before the
2444 file scope is created.) */
2445 if (B_IN_CURRENT_SCOPE (b)
2446 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2450 if (thislevel_only && !thislevel)
2453 if (TREE_CODE (b->decl) != code)
2455 /* Definition isn't the kind we were looking for. */
2456 pending_invalid_xref = name;
2457 pending_invalid_xref_location = input_location;
2459 /* If in the same binding level as a declaration as a tag
2460 of a different type, this must not be allowed to
2461 shadow that tag, so give the error immediately.
2462 (For example, "struct foo; union foo;" is invalid.) */
2464 pending_xref_error ();
2469 /* Print an error message now
2470 for a recent invalid struct, union or enum cross reference.
2471 We don't print them immediately because they are not invalid
2472 when used in the `struct foo;' construct for shadowing. */
2475 pending_xref_error (void)
2477 if (pending_invalid_xref != 0)
2478 error ("%H`%s' defined as wrong kind of tag",
2479 &pending_invalid_xref_location,
2480 IDENTIFIER_POINTER (pending_invalid_xref));
2481 pending_invalid_xref = 0;
2485 /* Look up NAME in the current scope and its superiors
2486 in the namespace of variables, functions and typedefs.
2487 Return a ..._DECL node of some kind representing its definition,
2488 or return 0 if it is undefined. */
2491 lookup_name (tree name)
2493 struct c_binding *b = I_SYMBOL_BINDING (name);
2494 if (b && !b->invisible)
2499 /* Similar to `lookup_name' but look only at the indicated scope. */
2502 lookup_name_in_scope (tree name, struct c_scope *scope)
2504 struct c_binding *b;
2506 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2507 if (B_IN_SCOPE (b, scope))
2512 /* Create the predefined scalar types of C,
2513 and some nodes representing standard constants (0, 1, (void *) 0).
2514 Initialize the global scope.
2515 Make definitions for built-in primitive functions. */
2518 c_init_decl_processing (void)
2521 tree ptr_ftype_void, ptr_ftype_ptr;
2522 location_t save_loc = input_location;
2524 /* Adds some ggc roots, and reserved words for c-parse.in. */
2527 current_function_decl = 0;
2529 gcc_obstack_init (&parser_obstack);
2531 /* Make the externals scope. */
2533 external_scope = current_scope;
2535 /* Declarations from c_common_nodes_and_builtins must not be associated
2536 with this input file, lest we get differences between using and not
2537 using preprocessed headers. */
2538 #ifdef USE_MAPPED_LOCATION
2539 input_location = BUILTINS_LOCATION;
2541 input_location.file = "<built-in>";
2542 input_location.line = 0;
2545 build_common_tree_nodes (flag_signed_char, false);
2547 c_common_nodes_and_builtins ();
2549 /* In C, comparisons and TRUTH_* expressions have type int. */
2550 truthvalue_type_node = integer_type_node;
2551 truthvalue_true_node = integer_one_node;
2552 truthvalue_false_node = integer_zero_node;
2554 /* Even in C99, which has a real boolean type. */
2555 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2556 boolean_type_node));
2558 endlink = void_list_node;
2559 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2561 = build_function_type (ptr_type_node,
2562 tree_cons (NULL_TREE, ptr_type_node, endlink));
2564 input_location = save_loc;
2566 pedantic_lvalues = true;
2568 make_fname_decl = c_make_fname_decl;
2569 start_fname_decls ();
2572 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2573 decl, NAME is the initialization string and TYPE_DEP indicates whether
2574 NAME depended on the type of the function. As we don't yet implement
2575 delayed emission of static data, we mark the decl as emitted
2576 so it is not placed in the output. Anything using it must therefore pull
2577 out the STRING_CST initializer directly. FIXME. */
2580 c_make_fname_decl (tree id, int type_dep)
2582 const char *name = fname_as_string (type_dep);
2583 tree decl, type, init;
2584 size_t length = strlen (name);
2586 type = build_array_type
2587 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2588 build_index_type (size_int (length)));
2590 decl = build_decl (VAR_DECL, id, type);
2592 TREE_STATIC (decl) = 1;
2593 TREE_READONLY (decl) = 1;
2594 DECL_ARTIFICIAL (decl) = 1;
2596 init = build_string (length + 1, name);
2597 free ((char *) name);
2598 TREE_TYPE (init) = type;
2599 DECL_INITIAL (decl) = init;
2601 TREE_USED (decl) = 1;
2603 if (current_function_decl)
2605 DECL_CONTEXT (decl) = current_function_decl;
2606 bind (id, decl, current_function_scope,
2607 /*invisible=*/false, /*nested=*/false);
2610 finish_decl (decl, init, NULL_TREE);
2615 /* Return a definition for a builtin function named NAME and whose data type
2616 is TYPE. TYPE should be a function type with argument types.
2617 FUNCTION_CODE tells later passes how to compile calls to this function.
2618 See tree.h for its possible values.
2620 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2621 the name to be called if we can't opencode the function. If
2622 ATTRS is nonzero, use that for the function's attribute list. */
2625 builtin_function (const char *name, tree type, int function_code,
2626 enum built_in_class cl, const char *library_name,
2629 tree id = get_identifier (name);
2630 tree decl = build_decl (FUNCTION_DECL, id, type);
2631 TREE_PUBLIC (decl) = 1;
2632 DECL_EXTERNAL (decl) = 1;
2633 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2634 DECL_BUILT_IN_CLASS (decl) = cl;
2635 DECL_FUNCTION_CODE (decl) = function_code;
2637 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2639 /* Should never be called on a symbol with a preexisting meaning. */
2640 gcc_assert (!I_SYMBOL_BINDING (id));
2642 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2644 /* Builtins in the implementation namespace are made visible without
2645 needing to be explicitly declared. See push_file_scope. */
2646 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2648 TREE_CHAIN (decl) = visible_builtins;
2649 visible_builtins = decl;
2652 /* Possibly apply some default attributes to this built-in function. */
2654 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2656 decl_attributes (&decl, NULL_TREE, 0);
2661 /* Called when a declaration is seen that contains no names to declare.
2662 If its type is a reference to a structure, union or enum inherited
2663 from a containing scope, shadow that tag name for the current scope
2664 with a forward reference.
2665 If its type defines a new named structure or union
2666 or defines an enum, it is valid but we need not do anything here.
2667 Otherwise, it is an error. */
2670 shadow_tag (const struct c_declspecs *declspecs)
2672 shadow_tag_warned (declspecs, 0);
2675 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2678 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2680 bool found_tag = false;
2682 pending_invalid_xref = 0;
2684 if (declspecs->type && !declspecs->typedef_decl)
2686 tree value = declspecs->type;
2687 enum tree_code code = TREE_CODE (value);
2689 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2690 /* Used to test also that TYPE_SIZE (value) != 0.
2691 That caused warning for `struct foo;' at top level in the file. */
2693 tree name = TYPE_NAME (value);
2700 if (warned != 1 && code != ENUMERAL_TYPE)
2701 /* Empty unnamed enum OK */
2703 pedwarn ("unnamed struct/union that defines no instances");
2709 t = lookup_tag (code, name, 1);
2713 t = make_node (code);
2720 if (warned != 1 && !in_system_header)
2722 pedwarn ("useless type name in empty declaration");
2727 else if (warned != 1 && !in_system_header && declspecs->typedef_decl)
2729 pedwarn ("useless type name in empty declaration");
2733 if (found_tag && (declspecs->specbits & ((1 << (int) RID_LONG)
2734 | (1 << (int) RID_SHORT)
2735 | (1 << (int) RID_UNSIGNED)
2736 | (1 << (int) RID_SIGNED)
2737 | (1 << (int) RID_COMPLEX))))
2739 error ("long, short, signed, unsigned or complex used invalidly "
2740 "in empty declaration");
2744 if (!warned && !in_system_header && declspecs->specbits)
2746 warning ("useless keyword or type name in empty declaration");
2753 pedwarn ("empty declaration");
2757 /* Construct an array declarator. EXPR is the expression inside [], or
2758 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2759 to the pointer to which a parameter array is converted). STATIC_P is
2760 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2761 is true if the array is [*], a VLA of unspecified length which is
2762 nevertheless a complete type (not currently implemented by GCC),
2763 false otherwise. The field for the contained declarator is left to be
2764 filled in by set_array_declarator_inner. */
2766 struct c_declarator *
2767 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
2770 struct c_declarator *declarator = XOBNEW (&parser_obstack,
2771 struct c_declarator);
2772 declarator->kind = cdk_array;
2773 declarator->declarator = 0;
2774 declarator->u.array.dimen = expr;
2775 declarator->u.array.quals = quals;
2776 declarator->u.array.static_p = static_p;
2777 declarator->u.array.vla_unspec_p = vla_unspec_p;
2778 if (pedantic && !flag_isoc99)
2780 if (static_p || quals != NULL)
2781 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2783 pedwarn ("ISO C90 does not support `[*]' array declarators");
2786 warning ("GCC does not yet properly implement `[*]' array declarators");
2790 /* Set the contained declarator of an array declarator. DECL is the
2791 declarator, as constructed by build_array_declarator; INNER is what
2792 appears on the left of the []. ABSTRACT_P is true if it is an
2793 abstract declarator, false otherwise; this is used to reject static
2794 and type qualifiers in abstract declarators, where they are not in
2795 the C99 grammar (subject to possible change in DR#289). */
2797 struct c_declarator *
2798 set_array_declarator_inner (struct c_declarator *decl,
2799 struct c_declarator *inner, bool abstract_p)
2801 decl->declarator = inner;
2802 if (abstract_p && (decl->u.array.quals != NULL
2803 || decl->u.array.static_p))
2804 error ("static or type qualifiers in abstract declarator");
2808 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2811 groktypename (struct c_type_name *type_name)
2814 tree attrs = type_name->specs->attrs;
2816 type_name->specs->attrs = NULL_TREE;
2818 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
2821 /* Apply attributes. */
2822 decl_attributes (&type, attrs, 0);
2827 /* Decode a declarator in an ordinary declaration or data definition.
2828 This is called as soon as the type information and variable name
2829 have been parsed, before parsing the initializer if any.
2830 Here we create the ..._DECL node, fill in its type,
2831 and put it on the list of decls for the current context.
2832 The ..._DECL node is returned as the value.
2834 Exception: for arrays where the length is not specified,
2835 the type is left null, to be filled in by `finish_decl'.
2837 Function definitions do not come here; they go to start_function
2838 instead. However, external and forward declarations of functions
2839 do go through here. Structure field declarations are done by
2840 grokfield and not through here. */
2843 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
2844 bool initialized, tree attributes)
2849 /* An object declared as __attribute__((deprecated)) suppresses
2850 warnings of uses of other deprecated items. */
2851 if (lookup_attribute ("deprecated", attributes))
2852 deprecated_state = DEPRECATED_SUPPRESS;
2854 decl = grokdeclarator (declarator, declspecs,
2855 NORMAL, initialized, NULL);
2857 deprecated_state = DEPRECATED_NORMAL;
2859 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2860 && MAIN_NAME_P (DECL_NAME (decl)))
2861 warning ("%J'%D' is usually a function", decl, decl);
2864 /* Is it valid for this decl to have an initializer at all?
2865 If not, set INITIALIZED to zero, which will indirectly
2866 tell 'finish_decl' to ignore the initializer once it is parsed. */
2867 switch (TREE_CODE (decl))
2870 error ("typedef '%D' is initialized (use __typeof__ instead)", decl);
2875 error ("function '%D' is initialized like a variable", decl);
2880 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2881 error ("parameter '%D' is initialized", decl);
2886 /* Don't allow initializations for incomplete types except for
2887 arrays which might be completed by the initialization. */
2889 /* This can happen if the array size is an undefined macro.
2890 We already gave a warning, so we don't need another one. */
2891 if (TREE_TYPE (decl) == error_mark_node)
2893 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2895 /* A complete type is ok if size is fixed. */
2897 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2898 || C_DECL_VARIABLE_SIZE (decl))
2900 error ("variable-sized object may not be initialized");
2904 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2906 error ("variable '%D' has initializer but incomplete type", decl);
2909 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2911 error ("elements of array '%D' have incomplete type", decl);
2918 if (current_scope == file_scope)
2919 TREE_STATIC (decl) = 1;
2921 /* Tell 'pushdecl' this is an initialized decl
2922 even though we don't yet have the initializer expression.
2923 Also tell 'finish_decl' it may store the real initializer. */
2924 DECL_INITIAL (decl) = error_mark_node;
2927 /* If this is a function declaration, write a record describing it to the
2928 prototypes file (if requested). */
2930 if (TREE_CODE (decl) == FUNCTION_DECL)
2931 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2933 /* ANSI specifies that a tentative definition which is not merged with
2934 a non-tentative definition behaves exactly like a definition with an
2935 initializer equal to zero. (Section 3.7.2)
2937 -fno-common gives strict ANSI behavior, though this tends to break
2938 a large body of code that grew up without this rule.
2940 Thread-local variables are never common, since there's no entrenched
2941 body of code to break, and it allows more efficient variable references
2942 in the presence of dynamic linking. */
2944 if (TREE_CODE (decl) == VAR_DECL
2946 && TREE_PUBLIC (decl)
2947 && !DECL_THREAD_LOCAL (decl)
2949 DECL_COMMON (decl) = 1;
2951 /* Set attributes here so if duplicate decl, will have proper attributes. */
2952 decl_attributes (&decl, attributes, 0);
2954 if (TREE_CODE (decl) == FUNCTION_DECL
2955 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2957 struct c_declarator *ce = declarator;
2959 if (ce->kind == cdk_pointer)
2960 ce = declarator->declarator;
2961 if (ce->kind == cdk_function)
2963 tree args = ce->u.arg_info->parms;
2964 for (; args; args = TREE_CHAIN (args))
2966 tree type = TREE_TYPE (args);
2967 if (type && INTEGRAL_TYPE_P (type)
2968 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2969 DECL_ARG_TYPE (args) = integer_type_node;
2974 if (TREE_CODE (decl) == FUNCTION_DECL
2975 && DECL_DECLARED_INLINE_P (decl)
2976 && DECL_UNINLINABLE (decl)
2977 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2978 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2980 /* Add this decl to the current scope.
2981 TEM may equal DECL or it may be a previous decl of the same name. */
2982 tem = pushdecl (decl);
2985 DECL_EXTERNAL (tem) = 0;
2990 /* Finish processing of a declaration;
2991 install its initial value.
2992 If the length of an array type is not known before,
2993 it must be determined now, from the initial value, or it is an error. */
2996 finish_decl (tree decl, tree init, tree asmspec_tree)
2998 tree type = TREE_TYPE (decl);
2999 int was_incomplete = (DECL_SIZE (decl) == 0);
3000 const char *asmspec = 0;
3002 /* If a name was specified, get the string. */
3003 if (current_scope == file_scope)
3004 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3006 asmspec = TREE_STRING_POINTER (asmspec_tree);
3008 /* If `start_decl' didn't like having an initialization, ignore it now. */
3009 if (init != 0 && DECL_INITIAL (decl) == 0)
3012 /* Don't crash if parm is initialized. */
3013 if (TREE_CODE (decl) == PARM_DECL)
3017 store_init_value (decl, init);
3019 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3020 || TREE_CODE (decl) == FUNCTION_DECL
3021 || TREE_CODE (decl) == FIELD_DECL))
3022 objc_check_decl (decl);
3024 /* Deduce size of array from initialization, if not already known. */
3025 if (TREE_CODE (type) == ARRAY_TYPE
3026 && TYPE_DOMAIN (type) == 0
3027 && TREE_CODE (decl) != TYPE_DECL)
3030 = (TREE_STATIC (decl)
3031 /* Even if pedantic, an external linkage array
3032 may have incomplete type at first. */
3033 ? pedantic && !TREE_PUBLIC (decl)
3034 : !DECL_EXTERNAL (decl));
3036 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3038 /* Get the completed type made by complete_array_type. */
3039 type = TREE_TYPE (decl);
3042 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
3044 else if (failure == 2)
3047 error ("%Jarray size missing in '%D'", decl, decl);
3048 /* If a `static' var's size isn't known,
3049 make it extern as well as static, so it does not get
3051 If it is not `static', then do not mark extern;
3052 finish_incomplete_decl will give it a default size
3053 and it will get allocated. */
3054 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3055 DECL_EXTERNAL (decl) = 1;
3058 /* TYPE_MAX_VALUE is always one less than the number of elements
3059 in the array, because we start counting at zero. Therefore,
3060 warn only if the value is less than zero. */
3061 else if (pedantic && TYPE_DOMAIN (type) != 0
3062 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3063 error ("%Jzero or negative size array '%D'", decl, decl);
3065 layout_decl (decl, 0);
3068 if (TREE_CODE (decl) == VAR_DECL)
3070 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3071 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3072 layout_decl (decl, 0);
3074 if (DECL_SIZE (decl) == 0
3075 /* Don't give an error if we already gave one earlier. */
3076 && TREE_TYPE (decl) != error_mark_node
3077 && (TREE_STATIC (decl)
3078 /* A static variable with an incomplete type
3079 is an error if it is initialized.
3080 Also if it is not file scope.
3081 Otherwise, let it through, but if it is not `extern'
3082 then it may cause an error message later. */
3083 ? (DECL_INITIAL (decl) != 0
3084 || !DECL_FILE_SCOPE_P (decl))
3085 /* An automatic variable with an incomplete type
3087 : !DECL_EXTERNAL (decl)))
3089 error ("%Jstorage size of '%D' isn't known", decl, decl);
3090 TREE_TYPE (decl) = error_mark_node;
3093 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3094 && DECL_SIZE (decl) != 0)
3096 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3097 constant_expression_warning (DECL_SIZE (decl));
3099 error ("%Jstorage size of '%D' isn't constant", decl, decl);
3102 if (TREE_USED (type))
3103 TREE_USED (decl) = 1;
3106 /* If this is a function and an assembler name is specified, reset DECL_RTL
3107 so we can give it its new name. Also, update built_in_decls if it
3108 was a normal built-in. */
3109 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3111 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3113 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
3114 set_user_assembler_name (builtin, asmspec);
3115 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
3116 init_block_move_fn (asmspec);
3117 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
3118 init_block_clear_fn (asmspec);
3120 set_user_assembler_name (decl, asmspec);
3123 /* If #pragma weak was used, mark the decl weak now. */
3124 if (current_scope == file_scope)
3125 maybe_apply_pragma_weak (decl);
3127 /* If this is a variable definition, determine its ELF visibility. */
3128 if (TREE_CODE (decl) == VAR_DECL
3129 && TREE_STATIC (decl)
3130 && !DECL_EXTERNAL (decl))
3131 c_determine_visibility (decl);
3133 /* Output the assembler code and/or RTL code for variables and functions,
3134 unless the type is an undefined structure or union.
3135 If not, it will get done when the type is completed. */
3137 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3139 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3140 if (c_dialect_objc ())
3141 objc_check_decl (decl);
3145 /* If this is not a static variable, issue a warning.
3146 It doesn't make any sense to give an ASMSPEC for an
3147 ordinary, non-register local variable. Historically,
3148 GCC has accepted -- but ignored -- the ASMSPEC in
3150 if (! DECL_FILE_SCOPE_P (decl)
3151 && TREE_CODE (decl) == VAR_DECL
3152 && !C_DECL_REGISTER (decl)
3153 && !TREE_STATIC (decl))
3154 warning ("%Jignoring asm-specifier for non-static local "
3155 "variable '%D'", decl, decl);
3156 else if (C_DECL_REGISTER (decl))
3157 change_decl_assembler_name (decl, get_identifier (asmspec));
3159 set_user_assembler_name (decl, asmspec);
3162 if (DECL_FILE_SCOPE_P (decl))
3164 if (DECL_INITIAL (decl) == NULL_TREE
3165 || DECL_INITIAL (decl) == error_mark_node)
3166 /* Don't output anything
3167 when a tentative file-scope definition is seen.
3168 But at end of compilation, do output code for them. */
3169 DECL_DEFER_OUTPUT (decl) = 1;
3170 rest_of_decl_compilation (decl, true, 0);
3174 /* In conjunction with an ASMSPEC, the `register'
3175 keyword indicates that we should place the variable
3176 in a particular register. */
3177 if (asmspec && C_DECL_REGISTER (decl))
3179 DECL_HARD_REGISTER (decl) = 1;
3180 /* This cannot be done for a structure with volatile
3181 fields, on which DECL_REGISTER will have been
3183 if (!DECL_REGISTER (decl))
3184 error ("cannot put object with volatile field into register");
3187 if (TREE_CODE (decl) != FUNCTION_DECL)
3189 /* If we're building a variable sized type, and we might be
3190 reachable other than via the top of the current binding
3191 level, then create a new BIND_EXPR so that we deallocate
3192 the object at the right time. */
3193 /* Note that DECL_SIZE can be null due to errors. */
3194 if (DECL_SIZE (decl)
3195 && !TREE_CONSTANT (DECL_SIZE (decl))
3196 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3199 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3200 TREE_SIDE_EFFECTS (bind) = 1;
3202 BIND_EXPR_BODY (bind) = push_stmt_list ();
3204 add_stmt (build_stmt (DECL_EXPR, decl));
3209 if (!DECL_FILE_SCOPE_P (decl))
3211 /* Recompute the RTL of a local array now
3212 if it used to be an incomplete type. */
3214 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3216 /* If we used it already as memory, it must stay in memory. */
3217 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3218 /* If it's still incomplete now, no init will save it. */
3219 if (DECL_SIZE (decl) == 0)
3220 DECL_INITIAL (decl) = 0;
3225 /* If this was marked 'used', be sure it will be output. */
3226 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3227 mark_decl_referenced (decl);
3229 if (TREE_CODE (decl) == TYPE_DECL)
3231 if (!DECL_FILE_SCOPE_P (decl)
3232 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3233 add_stmt (build_stmt (DECL_EXPR, decl));
3235 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3238 /* At the end of a declaration, throw away any variable type sizes
3239 of types defined inside that declaration. There is no use
3240 computing them in the following function definition. */
3241 if (current_scope == file_scope)
3242 get_pending_sizes ();
3244 /* Install a cleanup (aka destructor) if one was given. */
3245 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3247 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3250 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3251 tree cleanup_decl = lookup_name (cleanup_id);
3254 /* Build "cleanup(&decl)" for the destructor. */
3255 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3256 cleanup = build_tree_list (NULL_TREE, cleanup);
3257 cleanup = build_function_call (cleanup_decl, cleanup);
3259 /* Don't warn about decl unused; the cleanup uses it. */
3260 TREE_USED (decl) = 1;
3261 TREE_USED (cleanup_decl) = 1;
3263 /* Initialize EH, if we've been told to do so. */
3264 if (flag_exceptions && !c_eh_initialized_p)
3266 c_eh_initialized_p = true;
3267 eh_personality_libfunc
3268 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3269 ? "__gcc_personality_sj0"
3270 : "__gcc_personality_v0");
3271 using_eh_for_cleanups ();
3274 push_cleanup (decl, cleanup, false);
3279 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3282 grokparm (const struct c_parm *parm)
3284 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3287 decl_attributes (&decl, parm->attrs, 0);
3292 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3293 and push that on the current scope. */
3296 push_parm_decl (const struct c_parm *parm)
3300 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3301 decl_attributes (&decl, parm->attrs, 0);
3303 decl = pushdecl (decl);
3305 finish_decl (decl, NULL_TREE, NULL_TREE);
3308 /* Mark all the parameter declarations to date as forward decls.
3309 Also diagnose use of this extension. */
3312 mark_forward_parm_decls (void)
3314 struct c_binding *b;
3316 if (pedantic && !current_scope->warned_forward_parm_decls)
3318 pedwarn ("ISO C forbids forward parameter declarations");
3319 current_scope->warned_forward_parm_decls = true;
3322 for (b = current_scope->bindings; b; b = b->prev)
3323 if (TREE_CODE (b->decl) == PARM_DECL)
3324 TREE_ASM_WRITTEN (b->decl) = 1;
3327 static GTY(()) int compound_literal_number;
3329 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3330 literal, which may be an incomplete array type completed by the
3331 initializer; INIT is a CONSTRUCTOR that initializes the compound
3335 build_compound_literal (tree type, tree init)
3337 /* We do not use start_decl here because we have a type, not a declarator;
3338 and do not use finish_decl because the decl should be stored inside
3339 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3340 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3343 DECL_EXTERNAL (decl) = 0;
3344 TREE_PUBLIC (decl) = 0;
3345 TREE_STATIC (decl) = (current_scope == file_scope);
3346 DECL_CONTEXT (decl) = current_function_decl;
3347 TREE_USED (decl) = 1;
3348 TREE_TYPE (decl) = type;
3349 TREE_READONLY (decl) = TYPE_READONLY (type);
3350 store_init_value (decl, init);
3352 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3354 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3356 gcc_assert (!failure);
3359 type = TREE_TYPE (decl);
3360 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3361 return error_mark_node;
3363 stmt = build_stmt (DECL_EXPR, decl);
3364 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3365 TREE_SIDE_EFFECTS (complit) = 1;
3367 layout_decl (decl, 0);
3369 if (TREE_STATIC (decl))
3371 /* This decl needs a name for the assembler output. We also need
3372 a unique suffix to be added to the name. */
3375 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3376 compound_literal_number);
3377 compound_literal_number++;
3378 DECL_NAME (decl) = get_identifier (name);
3379 DECL_DEFER_OUTPUT (decl) = 1;
3380 DECL_COMDAT (decl) = 1;
3381 DECL_ARTIFICIAL (decl) = 1;
3383 rest_of_decl_compilation (decl, 1, 0);
3389 /* Make TYPE a complete type based on INITIAL_VALUE.
3390 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3391 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3394 complete_array_type (tree type, tree initial_value, int do_default)
3396 tree maxindex = NULL_TREE;
3401 /* Note MAXINDEX is really the maximum index,
3402 one less than the size. */
3403 if (TREE_CODE (initial_value) == STRING_CST)
3406 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3407 maxindex = build_int_cst (NULL_TREE,
3408 (TREE_STRING_LENGTH (initial_value)
3411 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3413 tree elts = CONSTRUCTOR_ELTS (initial_value);
3414 maxindex = build_int_cst (NULL_TREE, -1);
3415 for (; elts; elts = TREE_CHAIN (elts))
3417 if (TREE_PURPOSE (elts))
3418 maxindex = TREE_PURPOSE (elts);
3420 maxindex = fold (build2 (PLUS_EXPR, integer_type_node,
3421 maxindex, integer_one_node));
3426 /* Make an error message unless that happened already. */
3427 if (initial_value != error_mark_node)
3430 /* Prevent further error messages. */
3431 maxindex = build_int_cst (NULL_TREE, 0);
3438 maxindex = build_int_cst (NULL_TREE, 0);
3444 TYPE_DOMAIN (type) = build_index_type (maxindex);
3446 gcc_assert (TREE_TYPE (maxindex));
3449 /* Lay out the type now that we can get the real answer. */
3456 /* Determine whether TYPE is a structure with a flexible array member,
3457 or a union containing such a structure (possibly recursively). */
3460 flexible_array_type_p (tree type)
3463 switch (TREE_CODE (type))
3466 x = TYPE_FIELDS (type);
3469 while (TREE_CHAIN (x) != NULL_TREE)
3471 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3472 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3473 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3474 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3478 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3480 if (flexible_array_type_p (TREE_TYPE (x)))
3489 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3490 replacing with appropriate values if they are invalid. */
3492 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3495 unsigned int max_width;
3496 unsigned HOST_WIDE_INT w;
3497 const char *name = orig_name ? orig_name: _("<anonymous>");
3500 STRIP_NOPS (*width);
3502 /* Detect and ignore out of range field width and process valid
3504 if (TREE_CODE (*width) != INTEGER_CST)
3506 error ("bit-field `%s' width not an integer constant", name);
3507 *width = integer_one_node;
3511 constant_expression_warning (*width);
3512 if (tree_int_cst_sgn (*width) < 0)
3514 error ("negative width in bit-field `%s'", name);
3515 *width = integer_one_node;
3517 else if (integer_zerop (*width) && orig_name)
3519 error ("zero width for bit-field `%s'", name);
3520 *width = integer_one_node;
3524 /* Detect invalid bit-field type. */
3525 if (TREE_CODE (*type) != INTEGER_TYPE
3526 && TREE_CODE (*type) != BOOLEAN_TYPE
3527 && TREE_CODE (*type) != ENUMERAL_TYPE)
3529 error ("bit-field `%s' has invalid type", name);
3530 *type = unsigned_type_node;
3533 type_mv = TYPE_MAIN_VARIANT (*type);
3535 && type_mv != integer_type_node
3536 && type_mv != unsigned_type_node
3537 && type_mv != boolean_type_node)
3538 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3540 if (type_mv == boolean_type_node)
3541 max_width = CHAR_TYPE_SIZE;
3543 max_width = TYPE_PRECISION (*type);
3545 if (0 < compare_tree_int (*width, max_width))
3547 error ("width of `%s' exceeds its type", name);
3549 *width = build_int_cst (NULL_TREE, w);
3552 w = tree_low_cst (*width, 1);
3554 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3556 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3558 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3559 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3560 warning ("`%s' is narrower than values of its type", name);
3564 /* Given declspecs and a declarator,
3565 determine the name and type of the object declared
3566 and construct a ..._DECL node for it.
3567 (In one case we can return a ..._TYPE node instead.
3568 For invalid input we sometimes return 0.)
3570 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3572 DECL_CONTEXT says which syntactic context this declaration is in:
3573 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3574 FUNCDEF for a function definition. Like NORMAL but a few different
3575 error messages in each case. Return value may be zero meaning
3576 this definition is too screwy to try to parse.
3577 PARM for a parameter declaration (either within a function prototype
3578 or before a function body). Make a PARM_DECL, or return void_type_node.
3579 TYPENAME if for a typename (in a cast or sizeof).
3580 Don't make a DECL node; just return the ..._TYPE node.
3581 FIELD for a struct or union field; make a FIELD_DECL.
3582 INITIALIZED is true if the decl has an initializer.
3583 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3584 representing the width of the bit-field.
3586 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3587 It may also be so in the PARM case, for a prototype where the
3588 argument type is specified but not the name.
3590 This function is where the complicated C meanings of `static'
3591 and `extern' are interpreted. */
3594 grokdeclarator (const struct c_declarator *declarator,
3595 struct c_declspecs *declspecs,
3596 enum decl_context decl_context, bool initialized, tree *width)
3598 int specbits = declspecs->specbits;
3599 tree type = declspecs->type;
3603 int type_quals = TYPE_UNQUALIFIED;
3605 int defaulted_int = 0;
3606 const char *name, *orig_name;
3607 tree typedef_type = 0;
3608 int funcdef_flag = 0;
3609 bool funcdef_syntax = false;
3610 int size_varies = 0;
3611 tree decl_attr = NULL_TREE;
3612 struct c_declspecs *array_ptr_quals = 0;
3613 int array_parm_static = 0;
3614 tree returned_attrs = NULL_TREE;
3615 bool bitfield = width != NULL;
3617 struct c_arg_info *arg_info = 0;
3619 if (decl_context == FUNCDEF)
3620 funcdef_flag = 1, decl_context = NORMAL;
3622 /* Look inside a declarator for the name being declared
3623 and get it as a string, for an error message. */
3625 const struct c_declarator *decl = declarator;
3634 funcdef_syntax = (decl->kind == cdk_function);
3635 decl = decl->declarator;
3639 decl = decl->declarator;
3644 name = IDENTIFIER_POINTER (decl->u.id);
3656 /* A function definition's declarator must have the form of
3657 a function declarator. */
3659 if (funcdef_flag && !funcdef_syntax)
3662 /* If this looks like a function definition, make it one,
3663 even if it occurs where parms are expected.
3664 Then store_parm_decls will reject it and not use it as a parm. */
3665 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3666 decl_context = PARM;
3668 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3669 warn_deprecated_use (declspecs->typedef_decl
3670 ? declspecs->typedef_decl
3673 typedef_type = type;
3675 size_varies = C_TYPE_VARIABLE_SIZE (type);
3677 /* No type at all: default to `int', and set DEFAULTED_INT
3678 because it was not a user-defined typedef. */
3682 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3683 | (1 << (int) RID_SIGNED)
3684 | (1 << (int) RID_UNSIGNED)
3685 | (1 << (int) RID_COMPLEX))))
3686 /* Don't warn about typedef foo = bar. */
3687 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3688 && ! in_system_header)
3690 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3691 and this is a function, or if -Wimplicit; prefer the former
3692 warning since it is more explicit. */
3693 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3695 warn_about_return_type = 1;
3696 else if (warn_implicit_int || flag_isoc99)
3697 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3702 type = integer_type_node;
3705 /* Now process the modifiers that were specified
3706 and check for invalid combinations. */
3708 /* Long double is a special combination. */
3710 if ((specbits & 1 << (int) RID_LONG) && ! declspecs->long_long_p
3711 && TYPE_MAIN_VARIANT (type) == double_type_node)
3713 specbits &= ~(1 << (int) RID_LONG);
3714 type = long_double_type_node;
3717 /* Check all other uses of type modifiers. */
3719 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3720 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3724 if ((specbits & 1 << (int) RID_LONG)
3725 && (specbits & 1 << (int) RID_SHORT))
3726 error ("both long and short specified for `%s'", name);
3727 else if (((specbits & 1 << (int) RID_LONG)
3728 || (specbits & 1 << (int) RID_SHORT))
3729 && declspecs->explicit_char_p)
3730 error ("long or short specified with char for `%s'", name);
3731 else if (((specbits & 1 << (int) RID_LONG)
3732 || (specbits & 1 << (int) RID_SHORT))
3733 && TREE_CODE (type) == REAL_TYPE)
3735 static int already = 0;
3737 error ("long or short specified with floating type for `%s'", name);
3738 if (! already && ! pedantic)
3740 error ("the only valid combination is `long double'");
3744 else if ((specbits & 1 << (int) RID_SIGNED)
3745 && (specbits & 1 << (int) RID_UNSIGNED))
3746 error ("both signed and unsigned specified for `%s'", name);
3747 else if (TREE_CODE (type) != INTEGER_TYPE)
3748 error ("long, short, signed or unsigned invalid for `%s'", name);
3752 if (!declspecs->explicit_int_p && !defaulted_int
3753 && !declspecs->explicit_char_p)
3755 error ("long, short, signed or unsigned used invalidly for `%s'",
3761 /* Discard the type modifiers if they are invalid. */
3764 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3765 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3766 declspecs->long_long_p = 0;
3770 if ((specbits & (1 << (int) RID_COMPLEX))
3771 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3773 error ("complex invalid for `%s'", name);
3774 specbits &= ~(1 << (int) RID_COMPLEX);
3777 /* Decide whether an integer type is signed or not.
3778 Optionally treat bit-fields as signed by default. */
3779 if (specbits & 1 << (int) RID_UNSIGNED
3780 || (bitfield && ! flag_signed_bitfields
3781 && (declspecs->explicit_int_p || defaulted_int
3782 || declspecs->explicit_char_p
3783 /* A typedef for plain `int' without `signed'
3784 can be controlled just like plain `int'. */
3785 || ! (declspecs->typedef_decl != 0
3786 && C_TYPEDEF_EXPLICITLY_SIGNED (declspecs->typedef_decl)))
3787 && TREE_CODE (type) != ENUMERAL_TYPE
3788 && !(specbits & 1 << (int) RID_SIGNED)))
3790 if (declspecs->long_long_p)
3791 type = long_long_unsigned_type_node;
3792 else if (specbits & 1 << (int) RID_LONG)
3793 type = long_unsigned_type_node;
3794 else if (specbits & 1 << (int) RID_SHORT)
3795 type = short_unsigned_type_node;
3796 else if (type == char_type_node)
3797 type = unsigned_char_type_node;
3798 else if (declspecs->typedef_decl)
3799 type = c_common_unsigned_type (type);
3801 type = unsigned_type_node;
3803 else if ((specbits & 1 << (int) RID_SIGNED)
3804 && type == char_type_node)
3805 type = signed_char_type_node;
3806 else if (declspecs->long_long_p)
3807 type = long_long_integer_type_node;
3808 else if (specbits & 1 << (int) RID_LONG)
3809 type = long_integer_type_node;
3810 else if (specbits & 1 << (int) RID_SHORT)
3811 type = short_integer_type_node;
3813 if (specbits & 1 << (int) RID_COMPLEX)
3815 if (pedantic && !flag_isoc99)
3816 pedwarn ("ISO C90 does not support complex types");
3817 /* If we just have "complex", it is equivalent to
3818 "complex double", but if any modifiers at all are specified it is
3819 the complex form of TYPE. E.g, "complex short" is
3820 "complex short int". */
3822 if (defaulted_int && ! declspecs->long_long_p
3823 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3824 | (1 << (int) RID_SIGNED)
3825 | (1 << (int) RID_UNSIGNED))))
3828 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3829 type = complex_double_type_node;
3831 else if (type == integer_type_node)
3834 pedwarn ("ISO C does not support complex integer types");
3835 type = complex_integer_type_node;
3837 else if (type == float_type_node)
3838 type = complex_float_type_node;
3839 else if (type == double_type_node)
3840 type = complex_double_type_node;
3841 else if (type == long_double_type_node)
3842 type = complex_long_double_type_node;
3846 pedwarn ("ISO C does not support complex integer types");
3847 type = build_complex_type (type);
3851 /* Check the type and width of a bit-field. */
3853 check_bitfield_type_and_width (&type, width, orig_name);
3855 /* Figure out the type qualifiers for the declaration. There are
3856 two ways a declaration can become qualified. One is something
3857 like `const int i' where the `const' is explicit. Another is
3858 something like `typedef const int CI; CI i' where the type of the
3859 declaration contains the `const'. A third possibility is that
3860 there is a type qualifier on the element type of a typedefed
3861 array type, in which case we should extract that qualifier so
3862 that c_apply_type_quals_to_decls receives the full list of
3863 qualifiers to work with (C90 is not entirely clear about whether
3864 duplicate qualifiers should be diagnosed in this case, but it
3865 seems most appropriate to do so). */
3866 element_type = strip_array_types (type);
3867 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3869 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3871 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3872 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3873 if (pedantic && !flag_isoc99)
3876 pedwarn ("duplicate `const'");
3878 pedwarn ("duplicate `restrict'");
3880 pedwarn ("duplicate `volatile'");
3882 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3883 type = TYPE_MAIN_VARIANT (type);
3884 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3885 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3886 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3888 /* Warn if two storage classes are given. Default to `auto'. */
3893 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3894 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3895 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3896 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3897 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3899 /* "static __thread" and "extern __thread" are allowed. */
3900 if ((specbits & (1 << (int) RID_THREAD
3901 | 1 << (int) RID_STATIC
3902 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3905 /* Warn about storage classes that are invalid for certain
3906 kinds of declarations (parameters, typenames, etc.). */
3909 error ("multiple storage classes in declaration of `%s'", name);
3910 else if (funcdef_flag
3912 & ((1 << (int) RID_REGISTER)
3913 | (1 << (int) RID_AUTO)
3914 | (1 << (int) RID_TYPEDEF)
3915 | (1 << (int) RID_THREAD))))
3917 if (specbits & 1 << (int) RID_AUTO
3918 && (pedantic || current_scope == file_scope))
3919 pedwarn ("function definition declared `auto'");
3920 if (specbits & 1 << (int) RID_REGISTER)
3921 error ("function definition declared `register'");
3922 if (specbits & 1 << (int) RID_TYPEDEF)
3923 error ("function definition declared `typedef'");
3924 if (specbits & 1 << (int) RID_THREAD)
3925 error ("function definition declared `__thread'");
3926 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3927 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3929 else if (decl_context != NORMAL && nclasses > 0)
3931 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3935 switch (decl_context)
3938 error ("storage class specified for structure field `%s'",
3942 error ("storage class specified for parameter `%s'", name);
3945 error ("storage class specified for typename");
3948 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3949 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3950 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3953 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3955 /* `extern' with initialization is invalid if not at file scope. */
3956 if (current_scope == file_scope)
3957 warning ("`%s' initialized and declared `extern'", name);
3959 error ("`%s' has both `extern' and initializer", name);
3961 else if (current_scope == file_scope)
3963 if (specbits & 1 << (int) RID_AUTO)
3964 error ("file-scope declaration of `%s' specifies `auto'", name);
3968 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3969 error ("nested function `%s' declared `extern'", name);
3970 else if ((specbits & (1 << (int) RID_THREAD
3971 | 1 << (int) RID_EXTERN
3972 | 1 << (int) RID_STATIC))
3973 == (1 << (int) RID_THREAD))
3975 error ("function-scope `%s' implicitly auto and declared `__thread'",
3977 specbits &= ~(1 << (int) RID_THREAD);
3982 /* Now figure out the structure of the declarator proper.
3983 Descend through it, creating more complex types, until we reach
3984 the declared identifier (or NULL_TREE, in an absolute declarator). */
3986 while (declarator && declarator->kind != cdk_id)
3988 if (type == error_mark_node)
3990 declarator = declarator->declarator;
3994 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
3995 a cdk_pointer (for *...),
3996 a cdk_function (for ...(...)),
3997 a cdk_attrs (for nested attributes),
3998 or a cdk_id (for the name being declared
3999 or the place in an absolute declarator
4000 where the name was omitted).
4001 For the last case, we have just exited the loop.
4003 At this point, TYPE is the type of elements of an array,
4004 or for a function to return, or for a pointer to point to.
4005 After this sequence of ifs, TYPE is the type of the
4006 array or function or pointer, and DECLARATOR has had its
4007 outermost layer removed. */
4009 if (array_ptr_quals != NULL || array_parm_static)
4011 /* Only the innermost declarator (making a parameter be of
4012 array type which is converted to pointer type)
4013 may have static or type qualifiers. */
4014 error ("static or type qualifiers in non-parameter array declarator");
4015 array_ptr_quals = NULL;
4016 array_parm_static = 0;
4019 switch (declarator->kind)
4023 /* A declarator with embedded attributes. */
4024 tree attrs = declarator->u.attrs;
4025 const struct c_declarator *inner_decl;
4027 declarator = declarator->declarator;
4028 inner_decl = declarator;
4029 while (inner_decl->kind == cdk_attrs)
4030 inner_decl = inner_decl->declarator;
4031 if (inner_decl->kind == cdk_id)
4032 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4033 else if (inner_decl->kind == cdk_function)
4034 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4035 else if (inner_decl->kind == cdk_array)
4036 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4037 returned_attrs = decl_attributes (&type,
4038 chainon (returned_attrs, attrs),
4044 tree itype = NULL_TREE;
4045 tree size = declarator->u.array.dimen;
4046 /* The index is a signed object `sizetype' bits wide. */
4047 tree index_type = c_common_signed_type (sizetype);
4049 array_ptr_quals = declarator->u.array.quals;
4050 array_parm_static = declarator->u.array.static_p;
4052 declarator = declarator->declarator;
4054 /* Check for some types that there cannot be arrays of. */
4056 if (VOID_TYPE_P (type))
4058 error ("declaration of `%s' as array of voids", name);
4059 type = error_mark_node;
4062 if (TREE_CODE (type) == FUNCTION_TYPE)
4064 error ("declaration of `%s' as array of functions", name);
4065 type = error_mark_node;
4068 if (pedantic && !in_system_header && flexible_array_type_p (type))
4069 pedwarn ("invalid use of structure with flexible array member");
4071 if (size == error_mark_node)
4072 type = error_mark_node;
4074 if (type == error_mark_node)
4077 /* If size was specified, set ITYPE to a range-type for
4078 that size. Otherwise, ITYPE remains null. finish_decl
4079 may figure it out from an initial value. */
4083 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4085 STRIP_TYPE_NOPS (size);
4087 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4089 error ("size of array `%s' has non-integer type", name);
4090 size = integer_one_node;
4093 if (pedantic && integer_zerop (size))
4094 pedwarn ("ISO C forbids zero-size array `%s'", name);
4096 if (TREE_CODE (size) == INTEGER_CST)
4098 constant_expression_warning (size);
4099 if (tree_int_cst_sgn (size) < 0)
4101 error ("size of array `%s' is negative", name);
4102 size = integer_one_node;
4107 /* Make sure the array size remains visibly
4108 nonconstant even if it is (eg) a const variable
4109 with known value. */
4112 if (!flag_isoc99 && pedantic)
4114 if (TREE_CONSTANT (size))
4115 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
4118 pedwarn ("ISO C90 forbids variable-size array `%s'",
4123 if (integer_zerop (size))
4125 /* A zero-length array cannot be represented with
4126 an unsigned index type, which is what we'll
4127 get with build_index_type. Create an
4128 open-ended range instead. */
4129 itype = build_range_type (sizetype, size, NULL_TREE);
4133 /* Compute the maximum valid index, that is, size
4134 - 1. Do the calculation in index_type, so that
4135 if it is a variable the computations will be
4136 done in the proper mode. */
4137 itype = fold (build2 (MINUS_EXPR, index_type,
4138 convert (index_type, size),
4139 convert (index_type,
4142 /* If that overflowed, the array is too big. ???
4143 While a size of INT_MAX+1 technically shouldn't
4144 cause an overflow (because we subtract 1), the
4145 overflow is recorded during the conversion to
4146 index_type, before the subtraction. Handling
4147 this case seems like an unnecessary
4149 if (TREE_OVERFLOW (itype))
4151 error ("size of array `%s' is too large", name);
4152 type = error_mark_node;
4157 itype = variable_size (itype);
4158 itype = build_index_type (itype);
4161 else if (decl_context == FIELD)
4163 if (pedantic && !flag_isoc99 && !in_system_header)
4164 pedwarn ("ISO C90 does not support flexible array members");
4166 /* ISO C99 Flexible array members are effectively
4167 identical to GCC's zero-length array extension. */
4168 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4171 /* If pedantic, complain about arrays of incomplete types. */
4172 if (pedantic && !COMPLETE_TYPE_P (type))
4173 pedwarn ("array type has incomplete element type");
4175 /* Build the array type itself, then merge any constancy
4176 or volatility into the target type. We must do it in
4177 this order to ensure that the TYPE_MAIN_VARIANT field
4178 of the array type is set correctly. */
4179 type = build_array_type (type, itype);
4181 type = c_build_qualified_type (type, type_quals);
4184 C_TYPE_VARIABLE_SIZE (type) = 1;
4186 /* The GCC extension for zero-length arrays differs from
4187 ISO flexible array members in that sizeof yields
4189 if (size && integer_zerop (size))
4192 TYPE_SIZE (type) = bitsize_zero_node;
4193 TYPE_SIZE_UNIT (type) = size_zero_node;
4195 else if (declarator->kind == cdk_pointer)
4196 /* We can never complete an array type which is the
4197 target of a pointer, so go ahead and lay it out. */
4200 if (decl_context != PARM
4201 && (array_ptr_quals != NULL || array_parm_static))
4203 error ("static or type qualifiers in non-parameter array declarator");
4204 array_ptr_quals = NULL;
4205 array_parm_static = 0;
4211 /* Say it's a definition only for the declarator closest
4212 to the identifier, apart possibly from some
4214 bool really_funcdef = false;
4218 const struct c_declarator *t = declarator->declarator;
4219 while (t->kind == cdk_attrs)
4221 really_funcdef = (t->kind == cdk_id);
4224 /* Declaring a function type. Make sure we have a valid
4225 type for the function to return. */
4226 if (type == error_mark_node)
4231 /* Warn about some types functions can't return. */
4232 if (TREE_CODE (type) == FUNCTION_TYPE)
4234 error ("`%s' declared as function returning a function", name);
4235 type = integer_type_node;
4237 if (TREE_CODE (type) == ARRAY_TYPE)
4239 error ("`%s' declared as function returning an array", name);
4240 type = integer_type_node;
4243 /* Construct the function type and go to the next
4244 inner layer of declarator. */
4245 arg_info = declarator->u.arg_info;
4246 arg_types = grokparms (arg_info, really_funcdef);
4248 /* Type qualifiers before the return type of the function
4249 qualify the return type, not the function type. */
4252 /* Type qualifiers on a function return type are
4253 normally permitted by the standard but have no
4254 effect, so give a warning at -Wreturn-type.
4255 Qualifiers on a void return type are banned on
4256 function definitions in ISO C; GCC used to used
4257 them for noreturn functions. */
4258 if (VOID_TYPE_P (type) && really_funcdef)
4259 pedwarn ("function definition has qualified void return type");
4260 else if (warn_return_type)
4261 warning ("type qualifiers ignored on function return type");
4263 type = c_build_qualified_type (type, type_quals);
4265 type_quals = TYPE_UNQUALIFIED;
4267 type = build_function_type (type, arg_types);
4268 declarator = declarator->declarator;
4270 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4271 the formal parameter list of this FUNCTION_TYPE to point to
4272 the FUNCTION_TYPE node itself. */
4276 for (link = arg_info->tags;
4278 link = TREE_CHAIN (link))
4279 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4285 /* Merge any constancy or volatility into the target type
4288 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4290 pedwarn ("ISO C forbids qualified function types");
4292 type = c_build_qualified_type (type, type_quals);
4293 type_quals = TYPE_UNQUALIFIED;
4296 type = build_pointer_type (type);
4298 /* Process type qualifiers (such as const or volatile)
4299 that were given inside the `*'. */
4300 if (declarator->u.pointer_quals)
4302 int pbits = declarator->u.pointer_quals->specbits;
4304 /* The grammar should only permit qualifiers here. */
4305 gcc_assert (!declarator->u.pointer_quals->type
4306 && !(pbits & ~((1 << (int) RID_CONST)
4307 | (1 << (int) RID_VOLATILE)
4308 | (1 << (int) RID_RESTRICT))));
4310 constp = !!(pbits & (1 << (int) RID_CONST));
4311 volatilep = !!(pbits & (1 << (int) RID_VOLATILE));
4312 restrictp = !!(pbits & (1 << (int) RID_RESTRICT));
4314 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4315 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4316 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4319 declarator = declarator->declarator;
4327 /* Now TYPE has the actual type. */
4329 /* Did array size calculations overflow? */
4331 if (TREE_CODE (type) == ARRAY_TYPE
4332 && COMPLETE_TYPE_P (type)
4333 && TREE_OVERFLOW (TYPE_SIZE (type)))
4335 error ("size of array `%s' is too large", name);
4336 /* If we proceed with the array type as it is, we'll eventually
4337 crash in tree_low_cst(). */
4338 type = error_mark_node;
4341 /* If this is declaring a typedef name, return a TYPE_DECL. */
4343 if (specbits & (1 << (int) RID_TYPEDEF))
4346 /* Note that the grammar rejects storage classes
4347 in typenames, fields or parameters */
4348 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4350 pedwarn ("ISO C forbids qualified function types");
4352 type = c_build_qualified_type (type, type_quals);
4353 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4354 if ((specbits & (1 << (int) RID_SIGNED))
4355 || (declspecs->typedef_decl
4356 && C_TYPEDEF_EXPLICITLY_SIGNED (declspecs->typedef_decl)))
4357 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4358 decl_attributes (&decl, returned_attrs, 0);
4362 /* Detect the case of an array type of unspecified size
4363 which came, as such, direct from a typedef name.
4364 We must copy the type, so that each identifier gets
4365 a distinct type, so that each identifier's size can be
4366 controlled separately by its own initializer. */
4368 if (type != 0 && typedef_type != 0
4369 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4370 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4372 type = build_array_type (TREE_TYPE (type), 0);
4374 C_TYPE_VARIABLE_SIZE (type) = 1;
4377 /* If this is a type name (such as, in a cast or sizeof),
4378 compute the type and return it now. */
4380 if (decl_context == TYPENAME)
4382 /* Note that the grammar rejects storage classes
4383 in typenames, fields or parameters */
4384 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4386 pedwarn ("ISO C forbids const or volatile function types");
4388 type = c_build_qualified_type (type, type_quals);
4389 decl_attributes (&type, returned_attrs, 0);
4393 /* Aside from typedefs and type names (handle above),
4394 `void' at top level (not within pointer)
4395 is allowed only in public variables.
4396 We don't complain about parms either, but that is because
4397 a better error message can be made later. */
4399 if (VOID_TYPE_P (type) && decl_context != PARM
4400 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4401 && ((specbits & (1 << (int) RID_EXTERN))
4402 || (current_scope == file_scope
4404 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4406 error ("variable or field `%s' declared void", name);
4407 type = integer_type_node;
4410 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4411 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4416 if (decl_context == PARM)
4418 tree type_as_written;
4421 /* A parameter declared as an array of T is really a pointer to T.
4422 One declared as a function is really a pointer to a function. */
4424 if (TREE_CODE (type) == ARRAY_TYPE)
4426 /* Transfer const-ness of array into that of type pointed to. */
4427 type = TREE_TYPE (type);
4429 type = c_build_qualified_type (type, type_quals);
4430 type = build_pointer_type (type);
4431 type_quals = TYPE_UNQUALIFIED;
4432 if (array_ptr_quals)
4434 int apqbits = array_ptr_quals->specbits;
4436 /* We don't yet implement attributes in this context. */
4437 if (array_ptr_quals->attrs != NULL_TREE)
4438 warning ("attributes in parameter array declarator ignored");
4440 /* The grammar should only permit qualifiers here. */
4441 gcc_assert (!array_ptr_quals->type
4442 && !(apqbits & ~((1 << (int) RID_CONST)
4443 | (1 << (int) RID_VOLATILE)
4444 | (1 << (int) RID_RESTRICT))));
4446 constp = !!(apqbits & (1 << (int) RID_CONST));
4447 volatilep = !!(apqbits & (1 << (int) RID_VOLATILE));
4448 restrictp = !!(apqbits & (1 << (int) RID_RESTRICT));
4450 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4451 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4452 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4456 else if (TREE_CODE (type) == FUNCTION_TYPE)
4458 if (pedantic && type_quals)
4459 pedwarn ("ISO C forbids qualified function types");
4461 type = c_build_qualified_type (type, type_quals);
4462 type = build_pointer_type (type);
4463 type_quals = TYPE_UNQUALIFIED;
4465 else if (type_quals)
4466 type = c_build_qualified_type (type, type_quals);
4468 type_as_written = type;
4470 decl = build_decl (PARM_DECL, declarator->u.id, type);
4472 C_DECL_VARIABLE_SIZE (decl) = 1;
4474 /* Compute the type actually passed in the parmlist,
4475 for the case where there is no prototype.
4476 (For example, shorts and chars are passed as ints.)
4477 When there is a prototype, this is overridden later. */
4479 if (type == error_mark_node)
4480 promoted_type = type;
4482 promoted_type = c_type_promotes_to (type);
4484 DECL_ARG_TYPE (decl) = promoted_type;
4485 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4487 else if (decl_context == FIELD)
4489 /* Structure field. It may not be a function. */
4491 if (TREE_CODE (type) == FUNCTION_TYPE)
4493 error ("field `%s' declared as a function", name);
4494 type = build_pointer_type (type);
4496 else if (TREE_CODE (type) != ERROR_MARK
4497 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4499 error ("field `%s' has incomplete type", name);
4500 type = error_mark_node;
4502 /* Move type qualifiers down to element of an array. */
4503 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4504 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4506 TYPE_DOMAIN (type));
4507 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4508 DECL_NONADDRESSABLE_P (decl) = bitfield;
4511 C_DECL_VARIABLE_SIZE (decl) = 1;
4513 else if (TREE_CODE (type) == FUNCTION_TYPE)
4515 if (specbits & (1 << (int) RID_REGISTER)
4516 || specbits & (1 << (int) RID_THREAD))
4517 error ("invalid storage class for function `%s'", name);
4518 else if (current_scope != file_scope)
4520 /* Function declaration not at file scope. Storage
4521 classes other than `extern' are not allowed, C99
4522 6.7.1p5, and `extern' makes no difference. However,
4523 GCC allows 'auto', perhaps with 'inline', to support
4524 nested functions. */
4525 if (specbits & (1 << (int) RID_AUTO))
4528 pedwarn ("invalid storage class for function `%s'", name);
4530 if (specbits & (1 << (int) RID_STATIC))
4531 error ("invalid storage class for function `%s'", name);
4534 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4535 decl = build_decl_attribute_variant (decl, decl_attr);
4537 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4539 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4540 pedwarn ("ISO C forbids qualified function types");
4542 /* GNU C interprets a volatile-qualified function type to indicate
4543 that the function does not return. */
4544 if ((type_quals & TYPE_QUAL_VOLATILE)
4545 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4546 warning ("`noreturn' function returns non-void value");
4548 /* Every function declaration is an external reference
4549 (DECL_EXTERNAL) except for those which are not at file
4550 scope and are explicitly declared "auto". This is
4551 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4552 GCC to signify a forward declaration of a nested function. */
4553 if ((specbits & (1 << RID_AUTO)) && current_scope != file_scope)
4554 DECL_EXTERNAL (decl) = 0;
4556 DECL_EXTERNAL (decl) = 1;
4558 /* Record absence of global scope for `static' or `auto'. */
4560 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4562 /* For a function definition, record the argument information
4563 block where store_parm_decls will look for it. */
4565 current_function_arg_info = arg_info;
4568 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4570 /* Record presence of `inline', if it is reasonable. */
4571 if (MAIN_NAME_P (declarator->u.id))
4574 warning ("cannot inline function `main'");
4578 /* Record that the function is declared `inline'. */
4579 DECL_DECLARED_INLINE_P (decl) = 1;
4581 /* Do not mark bare declarations as DECL_INLINE. Doing so
4582 in the presence of multiple declarations can result in
4583 the abstract origin pointing between the declarations,
4584 which will confuse dwarf2out. */
4587 DECL_INLINE (decl) = 1;
4588 if (specbits & (1 << (int) RID_EXTERN))
4589 current_extern_inline = 1;
4592 /* If -finline-functions, assume it can be inlined. This does
4593 two things: let the function be deferred until it is actually
4594 needed, and let dwarf2 know that the function is inlinable. */
4595 else if (flag_inline_trees == 2 && initialized)
4596 DECL_INLINE (decl) = 1;
4600 /* It's a variable. */
4601 /* An uninitialized decl with `extern' is a reference. */
4602 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4604 /* Move type qualifiers down to element of an array. */
4605 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4607 int saved_align = TYPE_ALIGN(type);
4608 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4610 TYPE_DOMAIN (type));
4611 TYPE_ALIGN (type) = saved_align;
4613 else if (type_quals)
4614 type = c_build_qualified_type (type, type_quals);
4616 /* C99 6.2.2p7: It is invalid (compile-time undefined
4617 behavior) to create an 'extern' declaration for a
4618 variable if there is a global declaration that is
4619 'static' and the global declaration is not visible.
4620 (If the static declaration _is_ currently visible,
4621 the 'extern' declaration is taken to refer to that decl.) */
4622 if (extern_ref && current_scope != file_scope)
4624 tree global_decl = identifier_global_value (declarator->u.id);
4625 tree visible_decl = lookup_name (declarator->u.id);
4628 && global_decl != visible_decl
4629 && TREE_CODE (global_decl) == VAR_DECL
4630 && !TREE_PUBLIC (global_decl))
4631 error ("variable previously declared 'static' redeclared "
4635 decl = build_decl (VAR_DECL, declarator->u.id, type);
4637 C_DECL_VARIABLE_SIZE (decl) = 1;
4640 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4642 /* At file scope, an initialized extern declaration may follow
4643 a static declaration. In that case, DECL_EXTERNAL will be
4644 reset later in start_decl. */
4645 DECL_EXTERNAL (decl) = !!(specbits & (1 << (int) RID_EXTERN));
4647 /* At file scope, the presence of a `static' or `register' storage
4648 class specifier, or the absence of all storage class specifiers
4649 makes this declaration a definition (perhaps tentative). Also,
4650 the absence of both `static' and `register' makes it public. */
4651 if (current_scope == file_scope)
4653 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4654 | (1 << (int) RID_REGISTER)));
4655 TREE_STATIC (decl) = !extern_ref;
4657 /* Not at file scope, only `static' makes a static definition. */
4660 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4661 TREE_PUBLIC (decl) = extern_ref;
4664 if (specbits & 1 << (int) RID_THREAD)
4666 if (targetm.have_tls)
4667 DECL_THREAD_LOCAL (decl) = 1;
4669 /* A mere warning is sure to result in improper semantics
4670 at runtime. Don't bother to allow this to compile. */
4671 error ("thread-local storage not supported for this target");
4675 /* Record `register' declaration for warnings on &
4676 and in case doing stupid register allocation. */
4678 if (specbits & (1 << (int) RID_REGISTER))
4680 C_DECL_REGISTER (decl) = 1;
4681 DECL_REGISTER (decl) = 1;
4684 /* Record constancy and volatility. */
4685 c_apply_type_quals_to_decl (type_quals, decl);
4687 /* If a type has volatile components, it should be stored in memory.
4688 Otherwise, the fact that those components are volatile
4689 will be ignored, and would even crash the compiler. */
4690 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4692 /* It is not an error for a structure with volatile fields to
4693 be declared register, but reset DECL_REGISTER since it
4694 cannot actually go in a register. */
4695 int was_reg = C_DECL_REGISTER (decl);
4696 C_DECL_REGISTER (decl) = 0;
4697 DECL_REGISTER (decl) = 0;
4698 c_mark_addressable (decl);
4699 C_DECL_REGISTER (decl) = was_reg;
4702 /* This is the earliest point at which we might know the assembler
4703 name of a variable. Thus, if it's known before this, die horribly. */
4704 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4706 decl_attributes (&decl, returned_attrs, 0);
4712 /* Decode the parameter-list info for a function type or function definition.
4713 The argument is the value returned by `get_parm_info' (or made in parse.y
4714 if there is an identifier list instead of a parameter decl list).
4715 These two functions are separate because when a function returns
4716 or receives functions then each is called multiple times but the order
4717 of calls is different. The last call to `grokparms' is always the one
4718 that contains the formal parameter names of a function definition.
4720 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4722 FUNCDEF_FLAG is true for a function definition, false for
4723 a mere declaration. A nonempty identifier-list gets an error message
4724 when FUNCDEF_FLAG is false. */
4727 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4729 tree arg_types = arg_info->types;
4731 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4732 && !in_system_header)
4733 warning ("function declaration isn't a prototype");
4735 if (arg_types == error_mark_node)
4736 return 0; /* don't set TYPE_ARG_TYPES in this case */
4738 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4741 pedwarn ("parameter names (without types) in function declaration");
4743 arg_info->parms = arg_info->types;
4744 arg_info->types = 0;
4749 tree parm, type, typelt;
4750 unsigned int parmno;
4752 /* If the arg types are incomplete in a declaration, they must
4753 include undefined tags. These tags can never be defined in
4754 the scope of the declaration, so the types can never be
4755 completed, and no call can be compiled successfully. */
4757 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4759 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4761 type = TREE_VALUE (typelt);
4762 if (type == error_mark_node)
4765 if (!COMPLETE_TYPE_P (type))
4769 if (DECL_NAME (parm))
4770 error ("%Jparameter %u ('%D') has incomplete type",
4771 parm, parmno, parm);
4773 error ("%Jparameter %u has incomplete type",
4776 TREE_VALUE (typelt) = error_mark_node;
4777 TREE_TYPE (parm) = error_mark_node;
4781 if (DECL_NAME (parm))
4782 warning ("%Jparameter %u ('%D') has incomplete type",
4783 parm, parmno, parm);
4785 warning ("%Jparameter %u has incomplete type",
4794 /* Take apart the current scope and return a c_arg_info structure with
4795 info on a parameter list just parsed.
4797 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4799 ELLIPSIS being true means the argument list ended in '...' so don't
4800 append a sentinel (void_list_node) to the end of the type-list. */
4803 get_parm_info (bool ellipsis)
4805 struct c_binding *b = current_scope->bindings;
4806 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4813 static bool explained_incomplete_types = false;
4814 bool gave_void_only_once_err = false;
4816 arg_info->parms = 0;
4818 arg_info->types = 0;
4819 arg_info->others = 0;
4821 /* The bindings in this scope must not get put into a block.
4822 We will take care of deleting the binding nodes. */
4823 current_scope->bindings = 0;
4825 /* This function is only called if there was *something* on the
4829 /* A parameter list consisting solely of 'void' indicates that the
4830 function takes no arguments. But if the 'void' is qualified
4831 (by 'const' or 'volatile'), or has a storage class specifier
4832 ('register'), then the behavior is undefined; issue an error.
4833 Typedefs for 'void' are OK (see DR#157). */
4834 if (b->prev == 0 /* one binding */
4835 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4836 && !DECL_NAME (b->decl) /* anonymous */
4837 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4839 if (TREE_THIS_VOLATILE (b->decl)
4840 || TREE_READONLY (b->decl)
4841 || C_DECL_REGISTER (b->decl))
4842 error ("'void' as only parameter may not be qualified");
4844 /* There cannot be an ellipsis. */
4846 error ("'void' must be the only parameter");
4848 arg_info->types = void_list_node;
4853 types = void_list_node;
4855 /* Break up the bindings list into parms, tags, types, and others;
4856 apply sanity checks; purge the name-to-decl bindings. */
4859 tree decl = b->decl;
4860 tree type = TREE_TYPE (decl);
4861 const char *keyword;
4863 switch (TREE_CODE (decl))
4868 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4869 I_SYMBOL_BINDING (b->id) = b->shadowed;
4872 /* Check for forward decls that never got their actual decl. */
4873 if (TREE_ASM_WRITTEN (decl))
4874 error ("%Jparameter '%D' has just a forward declaration",
4876 /* Check for (..., void, ...) and issue an error. */
4877 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4879 if (!gave_void_only_once_err)
4881 error ("'void' must be the only parameter");
4882 gave_void_only_once_err = true;
4887 /* Valid parameter, add it to the list. */
4888 TREE_CHAIN (decl) = parms;
4891 /* Since there is a prototype, args are passed in their
4892 declared types. The back end may override this later. */
4893 DECL_ARG_TYPE (decl) = type;
4894 types = tree_cons (0, type, types);
4898 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4899 case UNION_TYPE: keyword = "union"; goto tag;
4900 case RECORD_TYPE: keyword = "struct"; goto tag;
4902 /* Types may not have tag-names, in which case the type
4903 appears in the bindings list with b->id NULL. */
4906 gcc_assert (I_TAG_BINDING (b->id) == b);
4907 I_TAG_BINDING (b->id) = b->shadowed;
4910 /* Warn about any struct, union or enum tags defined in a
4911 parameter list. The scope of such types is limited to
4912 the parameter list, which is rarely if ever desirable
4913 (it's impossible to call such a function with type-
4914 correct arguments). An anonymous union parm type is
4915 meaningful as a GNU extension, so don't warn for that. */
4916 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4919 /* The %s will be one of 'struct', 'union', or 'enum'. */
4920 warning ("'%s %E' declared inside parameter list",
4923 /* The %s will be one of 'struct', 'union', or 'enum'. */
4924 warning ("anonymous %s declared inside parameter list",
4927 if (! explained_incomplete_types)
4929 warning ("its scope is only this definition or declaration,"
4930 " which is probably not what you want");
4931 explained_incomplete_types = true;
4935 tags = tree_cons (b->id, decl, tags);
4940 /* CONST_DECLs appear here when we have an embedded enum,
4941 and TYPE_DECLs appear here when we have an embedded struct
4942 or union. No warnings for this - we already warned about the
4944 TREE_CHAIN (decl) = others;
4949 /* error_mark_node appears here when we have an undeclared
4950 variable. Just throw it away. */
4953 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4954 I_SYMBOL_BINDING (b->id) = b->shadowed;
4958 /* Other things that might be encountered. */
4966 b = free_binding_and_advance (b);
4969 arg_info->parms = parms;
4970 arg_info->tags = tags;
4971 arg_info->types = types;
4972 arg_info->others = others;
4976 /* Get the struct, enum or union (CODE says which) with tag NAME.
4977 Define the tag as a forward-reference if it is not defined. */
4980 xref_tag (enum tree_code code, tree name)
4982 /* If a cross reference is requested, look up the type
4983 already defined for this tag and return it. */
4985 tree ref = lookup_tag (code, name, 0);
4986 /* If this is the right type of tag, return what we found.
4987 (This reference will be shadowed by shadow_tag later if appropriate.)
4988 If this is the wrong type of tag, do not return it. If it was the
4989 wrong type in the same scope, we will have had an error
4990 message already; if in a different scope and declaring
4991 a name, pending_xref_error will give an error message; but if in a
4992 different scope and not declaring a name, this tag should
4993 shadow the previous declaration of a different type of tag, and
4994 this would not work properly if we return the reference found.
4995 (For example, with "struct foo" in an outer scope, "union foo;"
4996 must shadow that tag with a new one of union type.) */
4997 if (ref && TREE_CODE (ref) == code)
5000 /* If no such tag is yet defined, create a forward-reference node
5001 and record it as the "definition".
5002 When a real declaration of this type is found,
5003 the forward-reference will be altered into a real type. */
5005 ref = make_node (code);
5006 if (code == ENUMERAL_TYPE)
5008 /* Give the type a default layout like unsigned int
5009 to avoid crashing if it does not get defined. */
5010 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5011 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5012 TYPE_USER_ALIGN (ref) = 0;
5013 TYPE_UNSIGNED (ref) = 1;
5014 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5015 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5016 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5019 pushtag (name, ref);
5024 /* Make sure that the tag NAME is defined *in the current scope*
5025 at least as a forward reference.
5026 CODE says which kind of tag NAME ought to be. */
5029 start_struct (enum tree_code code, tree name)
5031 /* If there is already a tag defined at this scope
5032 (as a forward reference), just return it. */
5037 ref = lookup_tag (code, name, 1);
5038 if (ref && TREE_CODE (ref) == code)
5040 if (TYPE_FIELDS (ref))
5042 if (code == UNION_TYPE)
5043 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
5045 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
5050 /* Otherwise create a forward-reference just so the tag is in scope. */
5052 ref = make_node (code);
5053 pushtag (name, ref);
5056 C_TYPE_BEING_DEFINED (ref) = 1;
5057 TYPE_PACKED (ref) = flag_pack_struct;
5061 /* Process the specs, declarator and width (NULL if omitted)
5062 of a structure component, returning a FIELD_DECL node.
5063 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5065 This is done during the parsing of the struct declaration.
5066 The FIELD_DECL nodes are chained together and the lot of them
5067 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5070 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5075 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5076 && width == NULL_TREE)
5078 /* This is an unnamed decl.
5080 If we have something of the form "union { list } ;" then this
5081 is the anonymous union extension. Similarly for struct.
5083 If this is something of the form "struct foo;", then
5084 If MS extensions are enabled, this is handled as an
5086 Otherwise this is a forward declaration of a structure tag.
5088 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5089 If MS extensions are enabled and foo names a structure, then
5090 again this is an anonymous struct.
5091 Otherwise this is an error.
5093 Oh what a horrid tangled web we weave. I wonder if MS consciously
5094 took this from Plan 9 or if it was an accident of implementation
5095 that took root before someone noticed the bug... */
5097 tree type = declspecs->type;
5100 && (TREE_CODE (type) == RECORD_TYPE
5101 || TREE_CODE (type) == UNION_TYPE)
5102 && (flag_ms_extensions || !declspecs->typedef_decl))
5104 if (flag_ms_extensions)
5107 goto warn_unnamed_field;
5108 else if (TYPE_NAME (type) == NULL)
5111 goto warn_unnamed_field;
5116 warning ("declaration does not declare anything");
5121 value = grokdeclarator (declarator, declspecs, FIELD, false,
5122 width ? &width : NULL);
5124 finish_decl (value, NULL_TREE, NULL_TREE);
5125 DECL_INITIAL (value) = width;
5130 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5131 the list such that this does not present a problem later. */
5134 detect_field_duplicates (tree fieldlist)
5139 /* First, see if there are more than "a few" fields.
5140 This is trivially true if there are zero or one fields. */
5143 x = TREE_CHAIN (fieldlist);
5149 } while (timeout > 0 && x);
5151 /* If there were "few" fields, avoid the overhead of allocating
5152 a hash table. Instead just do the nested traversal thing. */
5155 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5158 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5159 if (DECL_NAME (y) == DECL_NAME (x))
5161 error ("%Jduplicate member '%D'", x, x);
5162 DECL_NAME (x) = NULL_TREE;
5168 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5171 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5172 if ((y = DECL_NAME (x)) != 0)
5174 slot = htab_find_slot (htab, y, INSERT);
5177 error ("%Jduplicate member '%D'", x, x);
5178 DECL_NAME (x) = NULL_TREE;
5187 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5188 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5189 ATTRIBUTES are attributes to be applied to the structure. */
5192 finish_struct (tree t, tree fieldlist, tree attributes)
5195 bool toplevel = file_scope == current_scope;
5196 int saw_named_field;
5198 /* If this type was previously laid out as a forward reference,
5199 make sure we lay it out again. */
5203 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5207 for (x = fieldlist; x; x = TREE_CHAIN (x))
5208 if (DECL_NAME (x) != 0)
5212 pedwarn ("%s has no %s",
5213 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5214 fieldlist ? _("named members") : _("members"));
5217 /* Install struct as DECL_CONTEXT of each field decl.
5218 Also process specified field sizes, found in the DECL_INITIAL,
5219 storing 0 there after the type has been changed to precision equal
5220 to its width, rather than the precision of the specified standard
5221 type. (Correct layout requires the original type to have been preserved
5224 saw_named_field = 0;
5225 for (x = fieldlist; x; x = TREE_CHAIN (x))
5227 DECL_CONTEXT (x) = t;
5228 DECL_PACKED (x) |= TYPE_PACKED (t);
5230 /* If any field is const, the structure type is pseudo-const. */
5231 if (TREE_READONLY (x))
5232 C_TYPE_FIELDS_READONLY (t) = 1;
5235 /* A field that is pseudo-const makes the structure likewise. */
5236 tree t1 = TREE_TYPE (x);
5237 while (TREE_CODE (t1) == ARRAY_TYPE)
5238 t1 = TREE_TYPE (t1);
5239 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5240 && C_TYPE_FIELDS_READONLY (t1))
5241 C_TYPE_FIELDS_READONLY (t) = 1;
5244 /* Any field that is volatile means variables of this type must be
5245 treated in some ways as volatile. */
5246 if (TREE_THIS_VOLATILE (x))
5247 C_TYPE_FIELDS_VOLATILE (t) = 1;
5249 /* Any field of nominal variable size implies structure is too. */
5250 if (C_DECL_VARIABLE_SIZE (x))
5251 C_TYPE_VARIABLE_SIZE (t) = 1;
5253 /* Detect invalid nested redefinition. */
5254 if (TREE_TYPE (x) == t)
5255 error ("nested redefinition of `%s'",
5256 IDENTIFIER_POINTER (TYPE_NAME (t)));
5258 if (DECL_INITIAL (x))
5260 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5261 DECL_SIZE (x) = bitsize_int (width);
5262 DECL_BIT_FIELD (x) = 1;
5263 SET_DECL_C_BIT_FIELD (x);
5266 /* Detect flexible array member in an invalid context. */
5267 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5268 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5269 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5270 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5272 if (TREE_CODE (t) == UNION_TYPE)
5274 error ("%Jflexible array member in union", x);
5275 TREE_TYPE (x) = error_mark_node;
5277 else if (TREE_CHAIN (x) != NULL_TREE)
5279 error ("%Jflexible array member not at end of struct", x);
5280 TREE_TYPE (x) = error_mark_node;
5282 else if (! saw_named_field)
5284 error ("%Jflexible array member in otherwise empty struct", x);
5285 TREE_TYPE (x) = error_mark_node;
5289 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5290 && flexible_array_type_p (TREE_TYPE (x)))
5291 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5294 saw_named_field = 1;
5297 detect_field_duplicates (fieldlist);
5299 /* Now we have the nearly final fieldlist. Record it,
5300 then lay out the structure or union (including the fields). */
5302 TYPE_FIELDS (t) = fieldlist;
5306 /* Give bit-fields their proper types. */
5308 tree *fieldlistp = &fieldlist;
5310 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5311 && TREE_TYPE (*fieldlistp) != error_mark_node)
5313 unsigned HOST_WIDE_INT width
5314 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5315 tree type = TREE_TYPE (*fieldlistp);
5316 if (width != TYPE_PRECISION (type))
5317 TREE_TYPE (*fieldlistp)
5318 = build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
5319 DECL_INITIAL (*fieldlistp) = 0;
5322 fieldlistp = &TREE_CHAIN (*fieldlistp);
5325 /* Now we have the truly final field list.
5326 Store it in this type and in the variants. */
5328 TYPE_FIELDS (t) = fieldlist;
5330 /* If there are lots of fields, sort so we can look through them fast.
5331 We arbitrarily consider 16 or more elts to be "a lot". */
5336 for (x = fieldlist; x; x = TREE_CHAIN (x))
5338 if (len > 15 || DECL_NAME (x) == NULL)
5346 struct lang_type *space;
5347 struct sorted_fields_type *space2;
5349 len += list_length (x);
5351 /* Use the same allocation policy here that make_node uses, to
5352 ensure that this lives as long as the rest of the struct decl.
5353 All decls in an inline function need to be saved. */
5355 space = GGC_CNEW (struct lang_type);
5356 space2 = GGC_NEWVAR (struct sorted_fields_type,
5357 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5361 field_array = &space2->elts[0];
5362 for (x = fieldlist; x; x = TREE_CHAIN (x))
5364 field_array[len++] = x;
5366 /* If there is anonymous struct or union, break out of the loop. */
5367 if (DECL_NAME (x) == NULL)
5370 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5373 TYPE_LANG_SPECIFIC (t) = space;
5374 TYPE_LANG_SPECIFIC (t)->s->len = len;
5375 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5376 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5381 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5383 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5384 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5385 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5386 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5389 /* If this was supposed to be a transparent union, but we can't
5390 make it one, warn and turn off the flag. */
5391 if (TREE_CODE (t) == UNION_TYPE
5392 && TYPE_TRANSPARENT_UNION (t)
5393 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5395 TYPE_TRANSPARENT_UNION (t) = 0;
5396 warning ("union cannot be made transparent");
5399 /* If this structure or union completes the type of any previous
5400 variable declaration, lay it out and output its rtl. */
5401 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5405 tree decl = TREE_VALUE (x);
5406 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5407 layout_array_type (TREE_TYPE (decl));
5408 if (TREE_CODE (decl) != TYPE_DECL)
5410 layout_decl (decl, 0);
5411 if (c_dialect_objc ())
5412 objc_check_decl (decl);
5413 rest_of_decl_compilation (decl, toplevel, 0);
5418 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5420 /* Finish debugging output for this type. */
5421 rest_of_type_compilation (t, toplevel);
5426 /* Lay out the type T, and its element type, and so on. */
5429 layout_array_type (tree t)
5431 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5432 layout_array_type (TREE_TYPE (t));
5436 /* Begin compiling the definition of an enumeration type.
5437 NAME is its name (or null if anonymous).
5438 Returns the type object, as yet incomplete.
5439 Also records info about it so that build_enumerator
5440 may be used to declare the individual values as they are read. */
5443 start_enum (tree name)
5447 /* If this is the real definition for a previous forward reference,
5448 fill in the contents in the same object that used to be the
5449 forward reference. */
5452 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5454 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5456 enumtype = make_node (ENUMERAL_TYPE);
5457 pushtag (name, enumtype);
5460 C_TYPE_BEING_DEFINED (enumtype) = 1;
5462 if (TYPE_VALUES (enumtype) != 0)
5464 /* This enum is a named one that has been declared already. */
5465 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5467 /* Completely replace its old definition.
5468 The old enumerators remain defined, however. */
5469 TYPE_VALUES (enumtype) = 0;
5472 enum_next_value = integer_zero_node;
5475 if (flag_short_enums)
5476 TYPE_PACKED (enumtype) = 1;
5481 /* After processing and defining all the values of an enumeration type,
5482 install their decls in the enumeration type and finish it off.
5483 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5484 and ATTRIBUTES are the specified attributes.
5485 Returns ENUMTYPE. */
5488 finish_enum (tree enumtype, tree values, tree attributes)
5491 tree minnode = 0, maxnode = 0;
5492 int precision, unsign;
5493 bool toplevel = (file_scope == current_scope);
5494 struct lang_type *lt;
5496 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5498 /* Calculate the maximum value of any enumerator in this type. */
5500 if (values == error_mark_node)
5501 minnode = maxnode = integer_zero_node;
5504 minnode = maxnode = TREE_VALUE (values);
5505 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5507 tree value = TREE_VALUE (pair);
5508 if (tree_int_cst_lt (maxnode, value))
5510 if (tree_int_cst_lt (value, minnode))
5515 /* Construct the final type of this enumeration. It is the same
5516 as one of the integral types - the narrowest one that fits, except
5517 that normally we only go as narrow as int - and signed iff any of
5518 the values are negative. */
5519 unsign = (tree_int_cst_sgn (minnode) >= 0);
5520 precision = MAX (min_precision (minnode, unsign),
5521 min_precision (maxnode, unsign));
5523 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5525 tem = c_common_type_for_size (precision, unsign);
5528 warning ("enumeration values exceed range of largest integer");
5529 tem = long_long_integer_type_node;
5533 tem = unsign ? unsigned_type_node : integer_type_node;
5535 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5536 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5537 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5538 TYPE_SIZE (enumtype) = 0;
5540 /* If the precision of the type was specific with an attribute and it
5541 was too small, give an error. Otherwise, use it. */
5542 if (TYPE_PRECISION (enumtype))
5544 if (precision > TYPE_PRECISION (enumtype))
5545 error ("specified mode too small for enumeral values");
5548 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5550 layout_type (enumtype);
5552 if (values != error_mark_node)
5554 /* Change the type of the enumerators to be the enum type. We
5555 need to do this irrespective of the size of the enum, for
5556 proper type checking. Replace the DECL_INITIALs of the
5557 enumerators, and the value slots of the list, with copies
5558 that have the enum type; they cannot be modified in place
5559 because they may be shared (e.g. integer_zero_node) Finally,
5560 change the purpose slots to point to the names of the decls. */
5561 for (pair = values; pair; pair = TREE_CHAIN (pair))
5563 tree enu = TREE_PURPOSE (pair);
5564 tree ini = DECL_INITIAL (enu);
5566 TREE_TYPE (enu) = enumtype;
5568 /* The ISO C Standard mandates enumerators to have type int,
5569 even though the underlying type of an enum type is
5570 unspecified. Here we convert any enumerators that fit in
5571 an int to type int, to avoid promotions to unsigned types
5572 when comparing integers with enumerators that fit in the
5573 int range. When -pedantic is given, build_enumerator()
5574 would have already taken care of those that don't fit. */
5575 if (int_fits_type_p (ini, integer_type_node))
5576 tem = integer_type_node;
5579 ini = convert (tem, ini);
5581 DECL_INITIAL (enu) = ini;
5582 TREE_PURPOSE (pair) = DECL_NAME (enu);
5583 TREE_VALUE (pair) = ini;
5586 TYPE_VALUES (enumtype) = values;
5589 /* Record the min/max values so that we can warn about bit-field
5590 enumerations that are too small for the values. */
5591 lt = GGC_CNEW (struct lang_type);
5592 lt->enum_min = minnode;
5593 lt->enum_max = maxnode;
5594 TYPE_LANG_SPECIFIC (enumtype) = lt;
5596 /* Fix up all variant types of this enum type. */
5597 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5599 if (tem == enumtype)
5601 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5602 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5603 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5604 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5605 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5606 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5607 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5608 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5609 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5610 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5611 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5614 /* Finish debugging output for this type. */
5615 rest_of_type_compilation (enumtype, toplevel);
5620 /* Build and install a CONST_DECL for one value of the
5621 current enumeration type (one that was begun with start_enum).
5622 Return a tree-list containing the CONST_DECL and its value.
5623 Assignment of sequential values by default is handled here. */
5626 build_enumerator (tree name, tree value)
5630 /* Validate and default VALUE. */
5632 /* Remove no-op casts from the value. */
5634 STRIP_TYPE_NOPS (value);
5638 /* Don't issue more errors for error_mark_node (i.e. an
5639 undeclared identifier) - just ignore the value expression. */
5640 if (value == error_mark_node)
5642 else if (TREE_CODE (value) != INTEGER_CST)
5644 error ("enumerator value for '%E' is not an integer constant", name);
5649 value = default_conversion (value);
5650 constant_expression_warning (value);
5654 /* Default based on previous value. */
5655 /* It should no longer be possible to have NON_LVALUE_EXPR
5659 value = enum_next_value;
5661 error ("overflow in enumeration values");
5664 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5666 pedwarn ("ISO C restricts enumerator values to range of `int'");
5667 /* XXX This causes -pedantic to change the meaning of the program.
5668 Remove? -zw 2004-03-15 */
5669 value = convert (integer_type_node, value);
5672 /* Set basis for default for next value. */
5673 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5674 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5676 /* Now create a declaration for the enum value name. */
5678 type = TREE_TYPE (value);
5679 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5680 TYPE_PRECISION (integer_type_node)),
5681 (TYPE_PRECISION (type)
5682 >= TYPE_PRECISION (integer_type_node)
5683 && TYPE_UNSIGNED (type)));
5685 decl = build_decl (CONST_DECL, name, type);
5686 DECL_INITIAL (decl) = convert (type, value);
5689 return tree_cons (decl, value, NULL_TREE);
5693 /* Create the FUNCTION_DECL for a function definition.
5694 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5695 the declaration; they describe the function's name and the type it returns,
5696 but twisted together in a fashion that parallels the syntax of C.
5698 This function creates a binding context for the function body
5699 as well as setting up the FUNCTION_DECL in current_function_decl.
5701 Returns 1 on success. If the DECLARATOR is not suitable for a function
5702 (it defines a datum instead), we return 0, which tells
5703 yyparse to report a parse error. */
5706 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5709 tree decl1, old_decl;
5710 tree restype, resdecl;
5712 current_function_returns_value = 0; /* Assume, until we see it does. */
5713 current_function_returns_null = 0;
5714 current_function_returns_abnormally = 0;
5715 warn_about_return_type = 0;
5716 current_extern_inline = 0;
5717 c_switch_stack = NULL;
5719 /* Indicate no valid break/continue context by setting these variables
5720 to some non-null, non-label value. We'll notice and emit the proper
5721 error message in c_finish_bc_stmt. */
5722 c_break_label = c_cont_label = size_zero_node;
5724 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5726 /* If the declarator is not suitable for a function definition,
5727 cause a syntax error. */
5731 decl_attributes (&decl1, attributes, 0);
5733 if (DECL_DECLARED_INLINE_P (decl1)
5734 && DECL_UNINLINABLE (decl1)
5735 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5736 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5738 announce_function (decl1);
5740 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5742 error ("return type is an incomplete type");
5743 /* Make it return void instead. */
5745 = build_function_type (void_type_node,
5746 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5749 if (warn_about_return_type)
5750 pedwarn_c99 ("return type defaults to `int'");
5752 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5753 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5754 DECL_INITIAL (decl1) = error_mark_node;
5756 /* If this definition isn't a prototype and we had a prototype declaration
5757 before, copy the arg type info from that prototype.
5758 But not if what we had before was a builtin function. */
5759 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5760 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5761 && !DECL_BUILT_IN (old_decl)
5762 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5763 TREE_TYPE (TREE_TYPE (old_decl)))
5764 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5766 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5768 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5771 /* Optionally warn of old-fashioned def with no previous prototype. */
5772 if (warn_strict_prototypes
5773 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5774 && C_DECL_ISNT_PROTOTYPE (old_decl))
5775 warning ("function declaration isn't a prototype");
5776 /* Optionally warn of any global def with no previous prototype. */
5777 else if (warn_missing_prototypes
5778 && TREE_PUBLIC (decl1)
5779 && ! MAIN_NAME_P (DECL_NAME (decl1))
5780 && C_DECL_ISNT_PROTOTYPE (old_decl))
5781 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5782 /* Optionally warn of any def with no previous prototype
5783 if the function has already been used. */
5784 else if (warn_missing_prototypes
5785 && old_decl != 0 && TREE_USED (old_decl)
5786 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5787 warning ("%J'%D' was used with no prototype before its definition",
5789 /* Optionally warn of any global def with no previous declaration. */
5790 else if (warn_missing_declarations
5791 && TREE_PUBLIC (decl1)
5793 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5794 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5795 /* Optionally warn of any def with no previous declaration
5796 if the function has already been used. */
5797 else if (warn_missing_declarations
5798 && old_decl != 0 && TREE_USED (old_decl)
5799 && C_DECL_IMPLICIT (old_decl))
5800 warning ("%J`%D' was used with no declaration before its definition",
5803 /* This is a definition, not a reference.
5804 So normally clear DECL_EXTERNAL.
5805 However, `extern inline' acts like a declaration
5806 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5807 DECL_EXTERNAL (decl1) = current_extern_inline;
5809 /* This function exists in static storage.
5810 (This does not mean `static' in the C sense!) */
5811 TREE_STATIC (decl1) = 1;
5813 /* A nested function is not global. */
5814 if (current_function_decl != 0)
5815 TREE_PUBLIC (decl1) = 0;
5817 /* This is the earliest point at which we might know the assembler
5818 name of the function. Thus, if it's set before this, die horribly. */
5819 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5821 /* If #pragma weak was used, mark the decl weak now. */
5822 if (current_scope == file_scope)
5823 maybe_apply_pragma_weak (decl1);
5825 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5826 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5831 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5832 != integer_type_node)
5833 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5835 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5836 args = TREE_CHAIN (args))
5838 tree type = args ? TREE_VALUE (args) : 0;
5840 if (type == void_type_node)
5847 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5848 pedwarn ("%Jfirst argument of '%D' should be `int'",
5853 if (TREE_CODE (type) != POINTER_TYPE
5854 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5855 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5857 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5862 if (TREE_CODE (type) != POINTER_TYPE
5863 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5864 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5866 pedwarn ("%Jthird argument of '%D' should probably be "
5867 "'char **'", decl1, decl1);
5872 /* It is intentional that this message does not mention the third
5873 argument because it's only mentioned in an appendix of the
5875 if (argct > 0 && (argct < 2 || argct > 3))
5876 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5878 if (! TREE_PUBLIC (decl1))
5879 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5882 /* Record the decl so that the function name is defined.
5883 If we already have a decl for this name, and it is a FUNCTION_DECL,
5884 use the old decl. */
5886 current_function_decl = pushdecl (decl1);
5889 declare_parm_level ();
5891 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5892 /* Promote the value to int before returning it. */
5893 if (c_promoting_integer_type_p (restype))
5895 /* It retains unsignedness if not really getting wider. */
5896 if (TYPE_UNSIGNED (restype)
5897 && (TYPE_PRECISION (restype)
5898 == TYPE_PRECISION (integer_type_node)))
5899 restype = unsigned_type_node;
5901 restype = integer_type_node;
5904 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
5905 DECL_ARTIFICIAL (resdecl) = 1;
5906 DECL_IGNORED_P (resdecl) = 1;
5907 DECL_RESULT (current_function_decl) = resdecl;
5909 start_fname_decls ();
5914 /* Subroutine of store_parm_decls which handles new-style function
5915 definitions (prototype format). The parms already have decls, so we
5916 need only record them as in effect and complain if any redundant
5917 old-style parm decls were written. */
5919 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
5923 if (current_scope->bindings)
5925 error ("%Jold-style parameter declarations in prototyped "
5926 "function definition", fndecl);
5928 /* Get rid of the old-style declarations. */
5932 /* Don't issue this warning for nested functions, and don't issue this
5933 warning if we got here because ARG_INFO_TYPES was error_mark_node
5934 (this happens when a function definition has just an ellipsis in
5935 its parameter list). */
5936 else if (warn_traditional && !in_system_header && !current_function_scope
5937 && arg_info->types != error_mark_node)
5938 warning ("%Jtraditional C rejects ISO C style function definitions",
5941 /* Now make all the parameter declarations visible in the function body.
5942 We can bypass most of the grunt work of pushdecl. */
5943 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
5945 DECL_CONTEXT (decl) = current_function_decl;
5946 if (DECL_NAME (decl))
5947 bind (DECL_NAME (decl), decl, current_scope,
5948 /*invisible=*/false, /*nested=*/false);
5950 error ("%Jparameter name omitted", decl);
5953 /* Record the parameter list in the function declaration. */
5954 DECL_ARGUMENTS (fndecl) = arg_info->parms;
5956 /* Now make all the ancillary declarations visible, likewise. */
5957 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
5959 DECL_CONTEXT (decl) = current_function_decl;
5960 if (DECL_NAME (decl))
5961 bind (DECL_NAME (decl), decl, current_scope,
5962 /*invisible=*/false, /*nested=*/false);
5965 /* And all the tag declarations. */
5966 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
5967 if (TREE_PURPOSE (decl))
5968 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
5969 /*invisible=*/false, /*nested=*/false);
5972 /* Subroutine of store_parm_decls which handles old-style function
5973 definitions (separate parameter list and declarations). */
5976 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
5978 struct c_binding *b;
5979 tree parm, decl, last;
5980 tree parmids = arg_info->parms;
5982 /* We use DECL_WEAK as a flag to show which parameters have been
5983 seen already, since it is not used on PARM_DECL. */
5984 #ifdef ENABLE_CHECKING
5985 for (b = current_scope->bindings; b; b = b->prev)
5986 gcc_assert (TREE_CODE (b->decl) != PARM_DECL || !DECL_WEAK (b->decl));
5989 if (warn_old_style_definition && !in_system_header)
5990 warning ("%Jold-style function definition", fndecl);
5992 /* Match each formal parameter name with its declaration. Save each
5993 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5994 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5996 if (TREE_VALUE (parm) == 0)
5998 error ("%Jparameter name missing from parameter list", fndecl);
5999 TREE_PURPOSE (parm) = 0;
6003 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6004 if (b && B_IN_CURRENT_SCOPE (b))
6007 /* If we got something other than a PARM_DECL it is an error. */
6008 if (TREE_CODE (decl) != PARM_DECL)
6009 error ("%J'%D' declared as a non-parameter", decl, decl);
6010 /* If the declaration is already marked, we have a duplicate
6011 name. Complain and ignore the duplicate. */
6012 else if (DECL_WEAK (decl))
6014 error ("%Jmultiple parameters named '%D'", decl, decl);
6015 TREE_PURPOSE (parm) = 0;
6018 /* If the declaration says "void", complain and turn it into
6020 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6022 error ("%Jparameter '%D' declared with void type", decl, decl);
6023 TREE_TYPE (decl) = integer_type_node;
6024 DECL_ARG_TYPE (decl) = integer_type_node;
6025 layout_decl (decl, 0);
6028 /* If no declaration found, default to int. */
6031 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6032 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6033 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6037 pedwarn ("%Jtype of '%D' defaults to 'int'", decl, decl);
6038 else if (extra_warnings)
6039 warning ("%Jtype of '%D' defaults to 'int'", decl, decl);
6042 TREE_PURPOSE (parm) = decl;
6043 DECL_WEAK (decl) = 1;
6046 /* Now examine the parms chain for incomplete declarations
6047 and declarations with no corresponding names. */
6049 for (b = current_scope->bindings; b; b = b->prev)
6052 if (TREE_CODE (parm) != PARM_DECL)
6055 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6057 error ("%Jparameter '%D' has incomplete type", parm, parm);
6058 TREE_TYPE (parm) = error_mark_node;
6061 if (! DECL_WEAK (parm))
6063 error ("%Jdeclaration for parameter '%D' but no such parameter",
6066 /* Pretend the parameter was not missing.
6067 This gets us to a standard state and minimizes
6068 further error messages. */
6069 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6073 /* Chain the declarations together in the order of the list of
6074 names. Store that chain in the function decl, replacing the
6075 list of names. Update the current scope to match. */
6076 DECL_ARGUMENTS (fndecl) = 0;
6078 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6079 if (TREE_PURPOSE (parm))
6081 if (parm && TREE_PURPOSE (parm))
6083 last = TREE_PURPOSE (parm);
6084 DECL_ARGUMENTS (fndecl) = last;
6085 DECL_WEAK (last) = 0;
6087 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6088 if (TREE_PURPOSE (parm))
6090 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6091 last = TREE_PURPOSE (parm);
6092 DECL_WEAK (last) = 0;
6094 TREE_CHAIN (last) = 0;
6097 /* If there was a previous prototype,
6098 set the DECL_ARG_TYPE of each argument according to
6099 the type previously specified, and report any mismatches. */
6101 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6104 for (parm = DECL_ARGUMENTS (fndecl),
6105 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6106 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6107 != void_type_node));
6108 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6110 if (parm == 0 || type == 0
6111 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6113 error ("number of arguments doesn't match prototype");
6114 error ("%Hprototype declaration",
6115 ¤t_function_prototype_locus);
6118 /* Type for passing arg must be consistent with that
6119 declared for the arg. ISO C says we take the unqualified
6120 type for parameters declared with qualified type. */
6121 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6122 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6124 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6125 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6127 /* Adjust argument to match prototype. E.g. a previous
6128 `int foo(float);' prototype causes
6129 `int foo(x) float x; {...}' to be treated like
6130 `int foo(float x) {...}'. This is particularly
6131 useful for argument types like uid_t. */
6132 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6134 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6135 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6136 && TYPE_PRECISION (TREE_TYPE (parm))
6137 < TYPE_PRECISION (integer_type_node))
6138 DECL_ARG_TYPE (parm) = integer_type_node;
6142 pedwarn ("promoted argument '%D' "
6143 "doesn't match prototype", parm);
6144 pedwarn ("%Hprototype declaration",
6145 ¤t_function_prototype_locus);
6150 error ("argument '%D' doesn't match prototype", parm);
6151 error ("%Hprototype declaration",
6152 ¤t_function_prototype_locus);
6156 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6159 /* Otherwise, create a prototype that would match. */
6163 tree actual = 0, last = 0, type;
6165 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6167 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6169 TREE_CHAIN (last) = type;
6174 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6176 TREE_CHAIN (last) = type;
6180 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6181 of the type of this function, but we need to avoid having this
6182 affect the types of other similarly-typed functions, so we must
6183 first force the generation of an identical (but separate) type
6184 node for the relevant function type. The new node we create
6185 will be a variant of the main variant of the original function
6188 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6190 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6194 /* Store parameter declarations passed in ARG_INFO into the current
6195 function declaration. */
6198 store_parm_decls_from (struct c_arg_info *arg_info)
6200 current_function_arg_info = arg_info;
6201 store_parm_decls ();
6204 /* Store the parameter declarations into the current function declaration.
6205 This is called after parsing the parameter declarations, before
6206 digesting the body of the function.
6208 For an old-style definition, construct a prototype out of the old-style
6209 parameter declarations and inject it into the function's type. */
6212 store_parm_decls (void)
6214 tree fndecl = current_function_decl;
6217 /* The argument information block for FNDECL. */
6218 struct c_arg_info *arg_info = current_function_arg_info;
6219 current_function_arg_info = 0;
6221 /* True if this definition is written with a prototype. Note:
6222 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6223 list in a function definition as equivalent to (void) -- an
6224 empty argument list specifies the function has no parameters,
6225 but only (void) sets up a prototype for future calls. */
6226 proto = arg_info->types != 0;
6229 store_parm_decls_newstyle (fndecl, arg_info);
6231 store_parm_decls_oldstyle (fndecl, arg_info);
6233 /* The next call to push_scope will be a function body. */
6235 next_is_function_body = true;
6237 /* Write a record describing this function definition to the prototypes
6238 file (if requested). */
6240 gen_aux_info_record (fndecl, 1, 0, proto);
6242 /* Initialize the RTL code for the function. */
6243 allocate_struct_function (fndecl);
6245 /* Begin the statement tree for this function. */
6246 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6248 /* ??? Insert the contents of the pending sizes list into the function
6249 to be evaluated. This just changes mis-behaviour until assign_parms
6250 phase ordering problems are resolved. */
6253 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6254 add_stmt (TREE_VALUE (t));
6257 /* Even though we're inside a function body, we still don't want to
6258 call expand_expr to calculate the size of a variable-sized array.
6259 We haven't necessarily assigned RTL to all variables yet, so it's
6260 not safe to try to expand expressions involving them. */
6261 cfun->x_dont_save_pending_sizes_p = 1;
6264 /* Give FNDECL and all its nested functions to cgraph for compilation. */
6267 c_finalize (tree fndecl)
6269 struct cgraph_node *cgn;
6271 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6272 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6274 /* ??? Objc emits functions after finalizing the compilation unit.
6275 This should be cleaned up later and this conditional removed. */
6276 if (cgraph_global_info_ready)
6278 c_expand_body (fndecl);
6282 /* Finalize all nested functions now. */
6283 cgn = cgraph_node (fndecl);
6284 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6285 c_finalize (cgn->decl);
6287 cgraph_finalize_function (fndecl, false);
6290 /* Finish up a function declaration and compile that function
6291 all the way to assembler language output. The free the storage
6292 for the function definition.
6294 This is called after parsing the body of the function definition. */
6297 finish_function (void)
6299 tree fndecl = current_function_decl;
6301 if (TREE_CODE (fndecl) == FUNCTION_DECL
6302 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6304 tree args = DECL_ARGUMENTS (fndecl);
6305 for (; args; args = TREE_CHAIN (args))
6307 tree type = TREE_TYPE (args);
6308 if (INTEGRAL_TYPE_P (type)
6309 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6310 DECL_ARG_TYPE (args) = integer_type_node;
6314 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6315 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6317 /* Must mark the RESULT_DECL as being in this function. */
6319 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6320 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6322 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6324 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6325 != integer_type_node)
6327 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6328 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6330 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6335 c_finish_return (integer_zero_node);
6339 /* Tie off the statement tree for this function. */
6340 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6342 finish_fname_decls ();
6344 /* Complain if there's just no return statement. */
6345 if (warn_return_type
6346 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6347 && !current_function_returns_value && !current_function_returns_null
6348 /* Don't complain if we abort. */
6349 && !current_function_returns_abnormally
6350 /* Don't warn for main(). */
6351 && !MAIN_NAME_P (DECL_NAME (fndecl))
6352 /* Or if they didn't actually specify a return type. */
6353 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6354 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6355 inline function, as we might never be compiled separately. */
6356 && DECL_INLINE (fndecl))
6357 warning ("no return statement in function returning non-void");
6359 /* With just -Wextra, complain only if function returns both with
6360 and without a value. */
6362 && current_function_returns_value
6363 && current_function_returns_null)
6364 warning ("this function may return with or without a value");
6366 /* Store the end of the function, so that we get good line number
6367 info for the epilogue. */
6368 cfun->function_end_locus = input_location;
6370 /* If we don't have ctors/dtors sections, and this is a static
6371 constructor or destructor, it must be recorded now. */
6372 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6373 && !targetm.have_ctors_dtors)
6374 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6375 if (DECL_STATIC_DESTRUCTOR (fndecl)
6376 && !targetm.have_ctors_dtors)
6377 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6379 /* Finalize the ELF visibility for the function. */
6380 c_determine_visibility (fndecl);
6382 /* Genericize before inlining. Delay genericizing nested functions
6383 until their parent function is genericized. Since finalizing
6384 requires GENERIC, delay that as well. */
6386 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6388 if (!decl_function_context (fndecl))
6390 c_genericize (fndecl);
6391 lower_nested_functions (fndecl);
6392 c_finalize (fndecl);
6396 /* Register this function with cgraph just far enough to get it
6397 added to our parent's nested function list. Handy, since the
6398 C front end doesn't have such a list. */
6399 (void) cgraph_node (fndecl);
6403 /* We're leaving the context of this function, so zap cfun.
6404 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6405 tree_rest_of_compilation. */
6407 current_function_decl = NULL;
6410 /* Generate the RTL for the body of FNDECL. */
6413 c_expand_body (tree fndecl)
6416 if (!DECL_INITIAL (fndecl)
6417 || DECL_INITIAL (fndecl) == error_mark_node)
6420 tree_rest_of_compilation (fndecl, false);
6422 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6423 && targetm.have_ctors_dtors)
6424 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6425 DEFAULT_INIT_PRIORITY);
6426 if (DECL_STATIC_DESTRUCTOR (fndecl)
6427 && targetm.have_ctors_dtors)
6428 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6429 DEFAULT_INIT_PRIORITY);
6432 /* Check the declarations given in a for-loop for satisfying the C99
6435 check_for_loop_decls (void)
6437 struct c_binding *b;
6441 /* If we get here, declarations have been used in a for loop without
6442 the C99 for loop scope. This doesn't make much sense, so don't
6444 error ("'for' loop initial declaration used outside C99 mode");
6447 /* C99 subclause 6.8.5 paragraph 3:
6449 [#3] The declaration part of a for statement shall only
6450 declare identifiers for objects having storage class auto or
6453 It isn't clear whether, in this sentence, "identifiers" binds to
6454 "shall only declare" or to "objects" - that is, whether all identifiers
6455 declared must be identifiers for objects, or whether the restriction
6456 only applies to those that are. (A question on this in comp.std.c
6457 in November 2000 received no answer.) We implement the strictest
6458 interpretation, to avoid creating an extension which later causes
6461 for (b = current_scope->bindings; b; b = b->prev)
6464 tree decl = b->decl;
6469 switch (TREE_CODE (decl))
6472 if (TREE_STATIC (decl))
6473 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6474 "initial declaration", decl, decl);
6475 else if (DECL_EXTERNAL (decl))
6476 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6477 "initial declaration", decl, decl);
6481 error ("'struct %E' declared in 'for' loop initial declaration", id);
6484 error ("'union %E' declared in 'for' loop initial declaration", id);
6487 error ("'enum %E' declared in 'for' loop initial declaration", id);
6490 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6491 "initial declaration", decl, decl);
6496 /* Save and reinitialize the variables
6497 used during compilation of a C function. */
6500 c_push_function_context (struct function *f)
6502 struct language_function *p;
6503 p = GGC_NEW (struct language_function);
6506 p->base.x_stmt_tree = c_stmt_tree;
6507 p->x_break_label = c_break_label;
6508 p->x_cont_label = c_cont_label;
6509 p->x_switch_stack = c_switch_stack;
6510 p->arg_info = current_function_arg_info;
6511 p->returns_value = current_function_returns_value;
6512 p->returns_null = current_function_returns_null;
6513 p->returns_abnormally = current_function_returns_abnormally;
6514 p->warn_about_return_type = warn_about_return_type;
6515 p->extern_inline = current_extern_inline;
6518 /* Restore the variables used during compilation of a C function. */
6521 c_pop_function_context (struct function *f)
6523 struct language_function *p = f->language;
6525 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6526 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6528 /* Stop pointing to the local nodes about to be freed. */
6529 /* But DECL_INITIAL must remain nonzero so we know this
6530 was an actual function definition. */
6531 DECL_INITIAL (current_function_decl) = error_mark_node;
6532 DECL_ARGUMENTS (current_function_decl) = 0;
6535 c_stmt_tree = p->base.x_stmt_tree;
6536 c_break_label = p->x_break_label;
6537 c_cont_label = p->x_cont_label;
6538 c_switch_stack = p->x_switch_stack;
6539 current_function_arg_info = p->arg_info;
6540 current_function_returns_value = p->returns_value;
6541 current_function_returns_null = p->returns_null;
6542 current_function_returns_abnormally = p->returns_abnormally;
6543 warn_about_return_type = p->warn_about_return_type;
6544 current_extern_inline = p->extern_inline;
6549 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6552 c_dup_lang_specific_decl (tree decl)
6554 struct lang_decl *ld;
6556 if (!DECL_LANG_SPECIFIC (decl))
6559 ld = GGC_NEW (struct lang_decl);
6560 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6561 DECL_LANG_SPECIFIC (decl) = ld;
6564 /* The functions below are required for functionality of doing
6565 function at once processing in the C front end. Currently these
6566 functions are not called from anywhere in the C front end, but as
6567 these changes continue, that will change. */
6569 /* Returns nonzero if the current statement is a full expression,
6570 i.e. temporaries created during that statement should be destroyed
6571 at the end of the statement. */
6574 stmts_are_full_exprs_p (void)
6579 /* Returns the stmt_tree (if any) to which statements are currently
6580 being added. If there is no active statement-tree, NULL is
6584 current_stmt_tree (void)
6586 return &c_stmt_tree;
6589 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6593 anon_aggr_type_p (tree ARG_UNUSED (node))
6598 /* Dummy function in place of callback used by C++. */
6601 extract_interface_info (void)
6605 /* Return the global value of T as a symbol. */
6608 identifier_global_value (tree t)
6610 struct c_binding *b;
6612 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6613 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6619 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6620 otherwise the name is found in ridpointers from RID_INDEX. */
6623 record_builtin_type (enum rid rid_index, const char *name, tree type)
6627 id = ridpointers[(int) rid_index];
6629 id = get_identifier (name);
6630 decl = build_decl (TYPE_DECL, id, type);
6632 if (debug_hooks->type_decl)
6633 debug_hooks->type_decl (decl, false);
6636 /* Build the void_list_node (void_type_node having been created). */
6638 build_void_list_node (void)
6640 tree t = build_tree_list (NULL_TREE, void_type_node);
6644 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6647 build_c_parm (struct c_declspecs *specs, tree attrs,
6648 struct c_declarator *declarator)
6650 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6653 ret->declarator = declarator;
6657 /* Return a declarator with nested attributes. TARGET is the inner
6658 declarator to which these attributes apply. ATTRS are the
6661 struct c_declarator *
6662 build_attrs_declarator (tree attrs, struct c_declarator *target)
6664 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6665 ret->kind = cdk_attrs;
6666 ret->declarator = target;
6667 ret->u.attrs = attrs;
6671 /* Return a declarator for a function with arguments specified by ARGS
6672 and return type specified by TARGET. */
6674 struct c_declarator *
6675 build_function_declarator (struct c_arg_info *args,
6676 struct c_declarator *target)
6678 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6679 ret->kind = cdk_function;
6680 ret->declarator = target;
6681 ret->u.arg_info = args;
6685 /* Return a declarator for the identifier IDENT (which may be
6686 NULL_TREE for an abstract declarator). */
6688 struct c_declarator *
6689 build_id_declarator (tree ident)
6691 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6693 ret->declarator = 0;
6698 /* Return something to represent absolute declarators containing a *.
6699 TARGET is the absolute declarator that the * contains.
6700 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6701 to apply to the pointer type. */
6703 struct c_declarator *
6704 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6705 struct c_declarator *target)
6708 struct c_declarator *itarget = target;
6709 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6710 if (type_quals_attrs)
6712 attrs = type_quals_attrs->attrs;
6713 type_quals_attrs->attrs = NULL_TREE;
6714 if (attrs != NULL_TREE)
6715 itarget = build_attrs_declarator (attrs, target);
6717 ret->kind = cdk_pointer;
6718 ret->declarator = itarget;
6719 ret->u.pointer_quals = type_quals_attrs;
6723 /* Return a pointer to a structure for an empty list of declaration
6726 struct c_declspecs *
6727 build_null_declspecs (void)
6729 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6731 ret->typedef_decl = 0;
6735 ret->non_sc_seen_p = false;
6736 ret->deprecated_p = false;
6737 ret->explicit_int_p = false;
6738 ret->explicit_char_p = false;
6739 ret->long_long_p = false;
6743 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6746 struct c_declspecs *
6747 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6750 specs->non_sc_seen_p = true;
6751 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6752 && C_IS_RESERVED_WORD (qual));
6753 i = C_RID_CODE (qual);
6754 gcc_assert (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT);
6755 if ((specs->specbits & (1 << (int) i)) && pedantic && !flag_isoc99)
6756 pedwarn ("duplicate %qs", IDENTIFIER_POINTER (qual));
6757 specs->specbits |= 1 << (int) i;
6761 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6764 struct c_declspecs *
6765 declspecs_add_type (struct c_declspecs *specs, tree type)
6767 specs->non_sc_seen_p = true;
6768 if (TREE_DEPRECATED (type))
6769 specs->deprecated_p = true;
6770 if (type == ridpointers[(int) RID_INT])
6771 specs->explicit_int_p = true;
6772 if (type == ridpointers[(int) RID_CHAR])
6773 specs->explicit_char_p = true;
6775 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
6777 enum rid i = C_RID_CODE (type);
6778 if ((int) i <= (int) RID_LAST_MODIFIER)
6780 if (i == RID_LONG && (specs->specbits & (1 << (int) RID_LONG)))
6782 if (specs->long_long_p)
6783 error ("%<long long long%> is too long for GCC");
6786 if (pedantic && !flag_isoc99 && !in_system_header
6788 pedwarn ("ISO C90 does not support %<long long%>");
6789 specs->long_long_p = 1;
6792 else if (specs->specbits & (1 << (int) i))
6793 error ("duplicate %qs", IDENTIFIER_POINTER (type));
6795 specs->specbits |= 1 << (int) i;
6800 error ("two or more data types in declaration specifiers");
6801 /* Actual typedefs come to us as TYPE_DECL nodes. */
6802 else if (TREE_CODE (type) == TYPE_DECL)
6804 if (TREE_TYPE (type) == error_mark_node)
6805 ; /* Allow the type to default to int to avoid cascading errors. */
6808 specs->type = TREE_TYPE (type);
6809 specs->decl_attr = DECL_ATTRIBUTES (type);
6810 specs->typedef_decl = type;
6813 /* Built-in types come as identifiers. */
6814 else if (TREE_CODE (type) == IDENTIFIER_NODE)
6816 tree t = lookup_name (type);
6817 if (!t || TREE_CODE (t) != TYPE_DECL)
6818 error ("%qs fails to be a typedef or built in type",
6819 IDENTIFIER_POINTER (type));
6820 else if (TREE_TYPE (t) == error_mark_node)
6823 specs->type = TREE_TYPE (t);
6825 else if (TREE_CODE (type) != ERROR_MARK)
6831 /* Add the storage class specifier or function specifier SCSPEC to the
6832 declaration specifiers SPECS, returning SPECS. */
6834 struct c_declspecs *
6835 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
6838 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
6839 && C_IS_RESERVED_WORD (scspec));
6840 i = C_RID_CODE (scspec);
6841 if (extra_warnings && specs->non_sc_seen_p)
6842 warning ("%qs is not at beginning of declaration",
6843 IDENTIFIER_POINTER (scspec));
6844 if (specs->specbits & (1 << (int) i))
6845 error ("duplicate %qs", IDENTIFIER_POINTER (scspec));
6846 /* Diagnose "__thread extern" and "__thread static". */
6847 if (specs->specbits & (1 << (int) RID_THREAD))
6849 if (i == RID_EXTERN)
6850 error ("%<__thread%> before %<extern%>");
6851 else if (i == RID_STATIC)
6852 error ("%<__thread%> before %<static%>");
6854 specs->specbits |= 1 << (int) i;
6858 /* Add the attributes ATTRS to the declaration specifiers SPECS,
6861 struct c_declspecs *
6862 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
6864 specs->attrs = chainon (attrs, specs->attrs);
6868 /* Synthesize a function which calls all the global ctors or global
6869 dtors in this file. This is only used for targets which do not
6870 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
6872 build_cdtor (int method_type, tree cdtors)
6879 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
6880 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
6883 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
6886 /* Perform final processing on one file scope's declarations (or the
6887 external scope's declarations), GLOBALS. */
6889 c_write_global_declarations_1 (tree globals)
6891 size_t len = list_length (globals);
6892 tree *vec = XNEWVEC (tree, len);
6896 /* Process the decls in the order they were written. */
6897 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6900 /* Check for used but undefined static functions using the C
6901 standard's definition of "used", and set TREE_NO_WARNING so
6902 that check_global_declarations doesn't repeat the check. */
6903 if (TREE_CODE (decl) == FUNCTION_DECL
6904 && DECL_INITIAL (decl) == 0
6905 && DECL_EXTERNAL (decl)
6906 && !TREE_PUBLIC (decl)
6907 && C_DECL_USED (decl))
6909 pedwarn ("%J%<%F%> used but never defined", decl, decl);
6910 TREE_NO_WARNING (decl) = 1;
6914 wrapup_global_declarations (vec, len);
6915 check_global_declarations (vec, len);
6921 c_write_global_declarations (void)
6925 /* We don't want to do this if generating a PCH. */
6929 /* Don't waste time on further processing if -fsyntax-only or we've
6930 encountered errors. */
6931 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
6934 /* Close the external scope. */
6935 ext_block = pop_scope ();
6937 gcc_assert (!current_scope);
6939 /* Process all file scopes in this compilation, and the external_scope,
6940 through wrapup_global_declarations and check_global_declarations. */
6941 for (t = all_translation_units; t; t = TREE_CHAIN (t))
6942 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
6943 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
6945 /* Generate functions to call static constructors and destructors
6946 for targets that do not support .ctors/.dtors sections. These
6947 functions have magic names which are detected by collect2. */
6948 build_cdtor ('I', static_ctors); static_ctors = 0;
6949 build_cdtor ('D', static_dtors); static_dtors = 0;
6951 /* We're done parsing; proceed to optimize and emit assembly.
6952 FIXME: shouldn't be the front end's responsibility to call this. */
6955 /* Presently this has to happen after cgraph_optimize.
6956 FIXME: shouldn't be the front end's responsibility to call this. */
6958 mudflap_finish_file ();
6961 #include "gt-c-decl.h"