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 %qD 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 %qD 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 %qD defined but not used", p, p);
729 warning ("%Jlabel %qD 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 && scope != external_scope)
772 warning ("%Junused variable %qD", p, p);
776 error ("%Jtype of array %qD completed incompatibly with"
777 " implicit initialization", p, p);
784 /* All of these go in BLOCK_VARS, but only if this is the
785 binding in the home scope. */
788 TREE_CHAIN (p) = BLOCK_VARS (block);
789 BLOCK_VARS (block) = p;
791 /* If this is the file scope, and we are processing more
792 than one translation unit in this compilation, set
793 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
794 This makes same_translation_unit_p work, and causes
795 static declarations to be given disambiguating suffixes. */
796 if (scope == file_scope && num_in_fnames > 1)
798 DECL_CONTEXT (p) = context;
799 if (TREE_CODE (p) == TYPE_DECL)
800 set_type_context (TREE_TYPE (p), context);
804 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
805 already been put there by store_parm_decls. Unused-
806 parameter warnings are handled by function.c.
807 error_mark_node obviously does not go in BLOCK_VARS and
808 does not get unused-variable warnings. */
811 /* It is possible for a decl not to have a name. We get
812 here with b->id NULL in this case. */
815 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
816 I_SYMBOL_BINDING (b->id) = b->shadowed;
817 if (b->shadowed && b->shadowed->type)
818 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
828 /* Dispose of the block that we just made inside some higher level. */
829 if ((scope->function_body || scope == file_scope) && context)
831 DECL_INITIAL (context) = block;
832 BLOCK_SUPERCONTEXT (block) = context;
834 else if (scope->outer)
837 SCOPE_LIST_APPEND (scope->outer, blocks, block);
838 /* If we did not make a block for the scope just exited, any
839 blocks made for inner scopes must be carried forward so they
840 will later become subblocks of something else. */
841 else if (scope->blocks)
842 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
845 /* Pop the current scope, and free the structure for reuse. */
846 current_scope = scope->outer;
847 if (scope->function_body)
848 current_function_scope = scope->outer_function;
850 memset (scope, 0, sizeof (struct c_scope));
851 scope->outer = scope_freelist;
852 scope_freelist = scope;
858 push_file_scope (void)
866 file_scope = current_scope;
868 start_fname_decls ();
870 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
871 bind (DECL_NAME (decl), decl, file_scope,
872 /*invisible=*/false, /*nested=*/true);
876 pop_file_scope (void)
878 /* In case there were missing closebraces, get us back to the global
880 while (current_scope != file_scope)
883 /* __FUNCTION__ is defined at file scope (""). This
884 call may not be necessary as my tests indicate it
885 still works without it. */
886 finish_fname_decls ();
888 /* This is the point to write out a PCH if we're doing that.
889 In that case we do not want to do anything else. */
892 c_common_write_pch ();
896 /* Pop off the file scope and close this translation unit. */
899 cgraph_finalize_compilation_unit ();
902 /* Insert BLOCK at the end of the list of subblocks of the current
903 scope. This is used when a BIND_EXPR is expanded, to handle the
904 BLOCK node inside the BIND_EXPR. */
907 insert_block (tree block)
909 TREE_USED (block) = 1;
910 SCOPE_LIST_APPEND (current_scope, blocks, block);
913 /* Push a definition or a declaration of struct, union or enum tag "name".
914 "type" should be the type node.
915 We assume that the tag "name" is not already defined.
917 Note that the definition may really be just a forward reference.
918 In that case, the TYPE_SIZE will be zero. */
921 pushtag (tree name, tree type)
923 /* Record the identifier as the type's name if it has none. */
924 if (name && !TYPE_NAME (type))
925 TYPE_NAME (type) = name;
926 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
928 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
929 tagged type we just added to the current scope. This fake
930 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
931 to output a representation of a tagged type, and it also gives
932 us a convenient place to record the "scope start" address for the
935 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
937 /* An approximation for now, so we can tell this is a function-scope tag.
938 This will be updated in pop_scope. */
939 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
942 /* Subroutine of compare_decls. Allow harmless mismatches in return
943 and argument types provided that the type modes match. This function
944 return a unified type given a suitable match, and 0 otherwise. */
947 match_builtin_function_types (tree newtype, tree oldtype)
949 tree newrettype, oldrettype;
950 tree newargs, oldargs;
951 tree trytype, tryargs;
953 /* Accept the return type of the new declaration if same modes. */
954 oldrettype = TREE_TYPE (oldtype);
955 newrettype = TREE_TYPE (newtype);
957 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
960 oldargs = TYPE_ARG_TYPES (oldtype);
961 newargs = TYPE_ARG_TYPES (newtype);
964 while (oldargs || newargs)
968 || !TREE_VALUE (oldargs)
969 || !TREE_VALUE (newargs)
970 || TYPE_MODE (TREE_VALUE (oldargs))
971 != TYPE_MODE (TREE_VALUE (newargs)))
974 oldargs = TREE_CHAIN (oldargs);
975 newargs = TREE_CHAIN (newargs);
978 trytype = build_function_type (newrettype, tryargs);
979 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
982 /* Subroutine of diagnose_mismatched_decls. Check for function type
983 mismatch involving an empty arglist vs a nonempty one and give clearer
986 diagnose_arglist_conflict (tree newdecl, tree olddecl,
987 tree newtype, tree oldtype)
991 if (TREE_CODE (olddecl) != FUNCTION_DECL
992 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
993 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
995 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
998 t = TYPE_ARG_TYPES (oldtype);
1000 t = TYPE_ARG_TYPES (newtype);
1001 for (; t; t = TREE_CHAIN (t))
1003 tree type = TREE_VALUE (t);
1005 if (TREE_CHAIN (t) == 0
1006 && TYPE_MAIN_VARIANT (type) != void_type_node)
1008 inform ("a parameter list with an ellipsis can't match "
1009 "an empty parameter name list declaration");
1013 if (c_type_promotes_to (type) != type)
1015 inform ("an argument type that has a default promotion can't match "
1016 "an empty parameter name list declaration");
1022 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1023 old-style function definition, NEWDECL is a prototype declaration.
1024 Diagnose inconsistencies in the argument list. Returns TRUE if
1025 the prototype is compatible, FALSE if not. */
1027 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1029 tree newargs, oldargs;
1032 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
1033 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
1035 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1036 newargs = TYPE_ARG_TYPES (newtype);
1041 tree oldargtype = TREE_VALUE (oldargs);
1042 tree newargtype = TREE_VALUE (newargs);
1044 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1047 /* Reaching the end of just one list means the two decls don't
1048 agree on the number of arguments. */
1049 if (END_OF_ARGLIST (oldargtype))
1051 error ("%Jprototype for %qD declares more arguments "
1052 "than previous old-style definition", newdecl, newdecl);
1055 else if (END_OF_ARGLIST (newargtype))
1057 error ("%Jprototype for %qD declares fewer arguments "
1058 "than previous old-style definition", newdecl, newdecl);
1062 /* Type for passing arg must be consistent with that declared
1064 else if (!comptypes (oldargtype, newargtype))
1066 error ("%Jprototype for %qD declares arg %d with incompatible type",
1067 newdecl, newdecl, i);
1071 oldargs = TREE_CHAIN (oldargs);
1072 newargs = TREE_CHAIN (newargs);
1076 /* If we get here, no errors were found, but do issue a warning
1077 for this poor-style construct. */
1078 warning ("%Jprototype for %qD follows non-prototype definition",
1081 #undef END_OF_ARGLIST
1084 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1085 first in a pair of mismatched declarations, using the diagnostic
1088 locate_old_decl (tree decl, void (*diag)(const char *, ...))
1090 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1092 else if (DECL_INITIAL (decl))
1093 diag (N_("%Jprevious definition of %qD was here"), decl, decl);
1094 else if (C_DECL_IMPLICIT (decl))
1095 diag (N_("%Jprevious implicit declaration of %qD was here"), decl, decl);
1097 diag (N_("%Jprevious declaration of %qD was here"), decl, decl);
1100 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1101 Returns true if the caller should proceed to merge the two, false
1102 if OLDDECL should simply be discarded. As a side effect, issues
1103 all necessary diagnostics for invalid or poor-style combinations.
1104 If it returns true, writes the types of NEWDECL and OLDDECL to
1105 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1106 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1109 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1110 tree *newtypep, tree *oldtypep)
1112 tree newtype, oldtype;
1113 bool pedwarned = false;
1114 bool warned = false;
1116 /* If we have error_mark_node for either decl or type, just discard
1117 the previous decl - we're in an error cascade already. */
1118 if (olddecl == error_mark_node || newdecl == error_mark_node)
1120 *oldtypep = oldtype = TREE_TYPE (olddecl);
1121 *newtypep = newtype = TREE_TYPE (newdecl);
1122 if (oldtype == error_mark_node || newtype == error_mark_node)
1125 /* Two different categories of symbol altogether. This is an error
1126 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1127 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1129 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1130 && DECL_BUILT_IN (olddecl)
1131 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1133 error ("%J%qD redeclared as different kind of symbol",
1135 locate_old_decl (olddecl, error);
1137 else if (TREE_PUBLIC (newdecl))
1138 warning ("%Jbuilt-in function %qD declared as non-function",
1140 else if (warn_shadow)
1141 warning ("%Jdeclaration of %qD shadows a built-in function",
1146 /* Enumerators have no linkage, so may only be declared once in a
1148 if (TREE_CODE (olddecl) == CONST_DECL)
1150 error ("%Jredeclaration of enumerator %qD", newdecl, newdecl);
1151 locate_old_decl (olddecl, error);
1155 if (!comptypes (oldtype, newtype))
1157 if (TREE_CODE (olddecl) == FUNCTION_DECL
1158 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1160 /* Accept harmless mismatch in function types.
1161 This is for the ffs and fprintf builtins. */
1162 tree trytype = match_builtin_function_types (newtype, oldtype);
1164 if (trytype && comptypes (newtype, trytype))
1165 *oldtypep = oldtype = trytype;
1168 /* If types don't match for a built-in, throw away the
1169 built-in. No point in calling locate_old_decl here, it
1170 won't print anything. */
1171 warning ("%Jconflicting types for built-in function %qD",
1176 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1177 && DECL_IS_BUILTIN (olddecl))
1179 /* A conflicting function declaration for a predeclared
1180 function that isn't actually built in. Objective C uses
1181 these. The new declaration silently overrides everything
1182 but the volatility (i.e. noreturn) indication. See also
1183 below. FIXME: Make Objective C use normal builtins. */
1184 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1187 /* Permit void foo (...) to match int foo (...) if the latter is
1188 the definition and implicit int was used. See
1189 c-torture/compile/920625-2.c. */
1190 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1191 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1192 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1193 && C_FUNCTION_IMPLICIT_INT (newdecl))
1195 pedwarn ("%Jconflicting types for %qD", newdecl, newdecl);
1196 /* Make sure we keep void as the return type. */
1197 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1198 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1203 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1204 error ("%J conflicting type qualifiers for %qD", newdecl, newdecl);
1206 error ("%Jconflicting types for %qD", newdecl, newdecl);
1207 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1208 locate_old_decl (olddecl, error);
1213 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1214 but silently ignore the redeclaration if either is in a system
1215 header. (Conflicting redeclarations were handled above.) */
1216 if (TREE_CODE (newdecl) == TYPE_DECL)
1218 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1219 return true; /* Allow OLDDECL to continue in use. */
1221 error ("%Jredefinition of typedef %qD", newdecl, newdecl);
1222 locate_old_decl (olddecl, error);
1226 /* Function declarations can either be 'static' or 'extern' (no
1227 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1228 can never conflict with each other on account of linkage (6.2.2p4).
1229 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1230 two definitions if one is 'extern inline' and one is not. The non-
1231 extern-inline definition supersedes the extern-inline definition. */
1232 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1234 /* If you declare a built-in function name as static, or
1235 define the built-in with an old-style definition (so we
1236 can't validate the argument list) the built-in definition is
1237 overridden, but optionally warn this was a bad choice of name. */
1238 if (DECL_BUILT_IN (olddecl)
1239 && !C_DECL_DECLARED_BUILTIN (olddecl)
1240 && (!TREE_PUBLIC (newdecl)
1241 || (DECL_INITIAL (newdecl)
1242 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1245 warning ("%Jdeclaration of %qD shadows a built-in function",
1247 /* Discard the old built-in function. */
1251 if (DECL_INITIAL (newdecl))
1253 if (DECL_INITIAL (olddecl)
1254 && !(DECL_DECLARED_INLINE_P (olddecl)
1255 && DECL_EXTERNAL (olddecl)
1256 && !(DECL_DECLARED_INLINE_P (newdecl)
1257 && DECL_EXTERNAL (newdecl)
1258 && same_translation_unit_p (olddecl, newdecl))))
1260 error ("%Jredefinition of %qD", newdecl, newdecl);
1261 locate_old_decl (olddecl, error);
1265 /* If we have a prototype after an old-style function definition,
1266 the argument types must be checked specially. */
1267 else if (DECL_INITIAL (olddecl)
1268 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1269 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1270 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1272 locate_old_decl (olddecl, error);
1275 /* A non-static declaration (even an "extern") followed by a
1276 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1277 The same is true for a static forward declaration at block
1278 scope followed by a non-static declaration/definition at file
1279 scope. Static followed by non-static at the same scope is
1280 not undefined behavior, and is the most convenient way to get
1281 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1282 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1283 we do diagnose it if -Wtraditional. */
1284 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1286 /* Two exceptions to the rule. If olddecl is an extern
1287 inline, or a predeclared function that isn't actually
1288 built in, newdecl silently overrides olddecl. The latter
1289 occur only in Objective C; see also above. (FIXME: Make
1290 Objective C use normal builtins.) */
1291 if (!DECL_IS_BUILTIN (olddecl)
1292 && !(DECL_EXTERNAL (olddecl)
1293 && DECL_DECLARED_INLINE_P (olddecl)))
1295 error ("%Jstatic declaration of %qD follows "
1296 "non-static declaration", newdecl, newdecl);
1297 locate_old_decl (olddecl, error);
1301 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1303 if (DECL_CONTEXT (olddecl))
1305 error ("%Jnon-static declaration of %qD follows "
1306 "static declaration", newdecl, newdecl);
1307 locate_old_decl (olddecl, error);
1310 else if (warn_traditional)
1312 warning ("%Jnon-static declaration of %qD follows "
1313 "static declaration", newdecl, newdecl);
1318 else if (TREE_CODE (newdecl) == VAR_DECL)
1320 /* Only variables can be thread-local, and all declarations must
1321 agree on this property. */
1322 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1324 if (DECL_THREAD_LOCAL (newdecl))
1325 error ("%Jthread-local declaration of %qD follows "
1326 "non-thread-local declaration", newdecl, newdecl);
1328 error ("%Jnon-thread-local declaration of %qD follows "
1329 "thread-local declaration", newdecl, newdecl);
1331 locate_old_decl (olddecl, error);
1335 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1336 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1338 error ("%Jredefinition of %qD", newdecl, newdecl);
1339 locate_old_decl (olddecl, error);
1343 /* Objects declared at file scope: if the first declaration had
1344 external linkage (even if it was an external reference) the
1345 second must have external linkage as well, or the behavior is
1346 undefined. If the first declaration had internal linkage, then
1347 the second must too, or else be an external reference (in which
1348 case the composite declaration still has internal linkage).
1349 As for function declarations, we warn about the static-then-
1350 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1351 if (DECL_FILE_SCOPE_P (newdecl)
1352 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1354 if (DECL_EXTERNAL (newdecl))
1356 if (!DECL_FILE_SCOPE_P (olddecl))
1358 error ("%Jextern declaration of %qD follows "
1359 "declaration with no linkage", newdecl, newdecl);
1360 locate_old_decl (olddecl, error);
1363 else if (warn_traditional)
1365 warning ("%Jnon-static declaration of %qD follows "
1366 "static declaration", newdecl, newdecl);
1372 if (TREE_PUBLIC (newdecl))
1373 error ("%Jnon-static declaration of %qD follows "
1374 "static declaration", newdecl, newdecl);
1376 error ("%Jstatic declaration of %qD follows "
1377 "non-static declaration", newdecl, newdecl);
1379 locate_old_decl (olddecl, error);
1383 /* Two objects with the same name declared at the same block
1384 scope must both be external references (6.7p3). */
1385 else if (!DECL_FILE_SCOPE_P (newdecl))
1387 if (DECL_EXTERNAL (newdecl))
1389 /* Extern with initializer at block scope, which will
1390 already have received an error. */
1392 else if (DECL_EXTERNAL (olddecl))
1394 error ("%Jdeclaration of %qD with no linkage follows "
1395 "extern declaration", newdecl, newdecl);
1396 locate_old_decl (olddecl, error);
1400 error ("%Jredeclaration of %qD with no linkage",
1402 locate_old_decl (olddecl, error);
1410 /* All decls must agree on a visibility. */
1411 if (DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1412 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1414 warning ("%Jredeclaration of %qD with different visibility "
1415 "(old visibility preserved)", newdecl, newdecl);
1419 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1421 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1422 if (DECL_DECLARED_INLINE_P (newdecl)
1423 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1425 warning ("%Jinline declaration of %qD follows "
1426 "declaration with attribute noinline", newdecl, newdecl);
1429 else if (DECL_DECLARED_INLINE_P (olddecl)
1430 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1432 warning ("%Jdeclaration of %qD with attribute noinline follows "
1433 "inline declaration ", newdecl, newdecl);
1437 /* Inline declaration after use or definition.
1438 ??? Should we still warn about this now we have unit-at-a-time
1439 mode and can get it right?
1440 Definitely don't complain if the decls are in different translation
1442 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1443 && same_translation_unit_p (olddecl, newdecl))
1445 if (TREE_USED (olddecl))
1447 warning ("%J%qD declared inline after being called",
1451 else if (DECL_INITIAL (olddecl))
1453 warning ("%J%qD declared inline after its definition",
1459 else /* PARM_DECL, VAR_DECL */
1461 /* Redeclaration of a parameter is a constraint violation (this is
1462 not explicitly stated, but follows from C99 6.7p3 [no more than
1463 one declaration of the same identifier with no linkage in the
1464 same scope, except type tags] and 6.2.2p6 [parameters have no
1465 linkage]). We must check for a forward parameter declaration,
1466 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1467 an extension, the mandatory diagnostic for which is handled by
1468 mark_forward_parm_decls. */
1470 if (TREE_CODE (newdecl) == PARM_DECL
1471 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1473 error ("%Jredefinition of parameter %qD", newdecl, newdecl);
1474 locate_old_decl (olddecl, error);
1479 /* Optional warning for completely redundant decls. */
1480 if (!warned && !pedwarned
1481 && warn_redundant_decls
1482 /* Don't warn about a function declaration followed by a
1484 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1485 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1486 /* Don't warn about redundant redeclarations of builtins. */
1487 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1488 && !DECL_BUILT_IN (newdecl)
1489 && DECL_BUILT_IN (olddecl)
1490 && !C_DECL_DECLARED_BUILTIN (olddecl))
1491 /* Don't warn about an extern followed by a definition. */
1492 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1493 /* Don't warn about forward parameter decls. */
1494 && !(TREE_CODE (newdecl) == PARM_DECL
1495 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1497 warning ("%Jredundant redeclaration of %qD", newdecl, newdecl);
1501 /* Report location of previous decl/defn in a consistent manner. */
1502 if (warned || pedwarned)
1503 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1508 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1509 consistent with OLDDECL, but carries new information. Merge the
1510 new information into OLDDECL. This function issues no
1514 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1516 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1517 && DECL_INITIAL (newdecl) != 0);
1519 /* For real parm decl following a forward decl, rechain the old decl
1520 in its new location and clear TREE_ASM_WRITTEN (it's not a
1521 forward decl anymore). */
1522 if (TREE_CODE (newdecl) == PARM_DECL
1523 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1525 struct c_binding *b, **here;
1527 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1528 if ((*here)->decl == olddecl)
1535 b->prev = current_scope->bindings;
1536 current_scope->bindings = b;
1538 TREE_ASM_WRITTEN (olddecl) = 0;
1541 DECL_ATTRIBUTES (newdecl)
1542 = targetm.merge_decl_attributes (olddecl, newdecl);
1544 /* Merge the data types specified in the two decls. */
1546 = TREE_TYPE (olddecl)
1547 = composite_type (newtype, oldtype);
1549 /* Lay the type out, unless already done. */
1550 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1552 if (TREE_TYPE (newdecl) != error_mark_node)
1553 layout_type (TREE_TYPE (newdecl));
1554 if (TREE_CODE (newdecl) != FUNCTION_DECL
1555 && TREE_CODE (newdecl) != TYPE_DECL
1556 && TREE_CODE (newdecl) != CONST_DECL)
1557 layout_decl (newdecl, 0);
1561 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1562 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1563 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1564 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1565 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1566 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1568 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1569 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1573 /* Keep the old rtl since we can safely use it. */
1574 COPY_DECL_RTL (olddecl, newdecl);
1576 /* Merge the type qualifiers. */
1577 if (TREE_READONLY (newdecl))
1578 TREE_READONLY (olddecl) = 1;
1580 if (TREE_THIS_VOLATILE (newdecl))
1582 TREE_THIS_VOLATILE (olddecl) = 1;
1583 if (TREE_CODE (newdecl) == VAR_DECL)
1584 make_var_volatile (newdecl);
1587 /* Merge deprecatedness. */
1588 if (TREE_DEPRECATED (newdecl))
1589 TREE_DEPRECATED (olddecl) = 1;
1591 /* Keep source location of definition rather than declaration. */
1592 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1593 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1595 /* Merge the unused-warning information. */
1596 if (DECL_IN_SYSTEM_HEADER (olddecl))
1597 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1598 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1599 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1601 /* Merge the initialization information. */
1602 if (DECL_INITIAL (newdecl) == 0)
1603 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1605 /* Merge the section attribute.
1606 We want to issue an error if the sections conflict but that must be
1607 done later in decl_attributes since we are called before attributes
1609 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1610 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1612 /* Copy the assembler name.
1613 Currently, it can only be defined in the prototype. */
1614 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1616 /* Use visibility of whichever declaration had it specified */
1617 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1619 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1620 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1623 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1625 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1626 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1627 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1628 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1629 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1630 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1631 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1632 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1633 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1636 /* Merge the storage class information. */
1637 merge_weak (newdecl, olddecl);
1639 /* For functions, static overrides non-static. */
1640 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1642 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1643 /* This is since we don't automatically
1644 copy the attributes of NEWDECL into OLDDECL. */
1645 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1646 /* If this clears `static', clear it in the identifier too. */
1647 if (!TREE_PUBLIC (olddecl))
1648 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1650 if (DECL_EXTERNAL (newdecl))
1652 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1653 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1655 /* An extern decl does not override previous storage class. */
1656 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1657 if (!DECL_EXTERNAL (newdecl))
1659 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1660 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1665 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1666 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1669 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1671 /* If we're redefining a function previously defined as extern
1672 inline, make sure we emit debug info for the inline before we
1673 throw it away, in case it was inlined into a function that hasn't
1674 been written out yet. */
1675 if (new_is_definition && DECL_INITIAL (olddecl))
1677 if (TREE_USED (olddecl)
1678 /* In unit-at-a-time mode we never inline re-defined extern
1679 inline functions. */
1680 && !flag_unit_at_a_time
1681 && cgraph_function_possibly_inlined_p (olddecl))
1682 (*debug_hooks->outlining_inline_function) (olddecl);
1684 /* The new defn must not be inline. */
1685 DECL_INLINE (newdecl) = 0;
1686 DECL_UNINLINABLE (newdecl) = 1;
1690 /* If either decl says `inline', this fn is inline,
1691 unless its definition was passed already. */
1692 if (DECL_DECLARED_INLINE_P (newdecl)
1693 || DECL_DECLARED_INLINE_P (olddecl))
1694 DECL_DECLARED_INLINE_P (newdecl) = 1;
1696 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1697 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1700 if (DECL_BUILT_IN (olddecl))
1702 /* If redeclaring a builtin function, it stays built in.
1703 But it gets tagged as having been declared. */
1704 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1705 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1706 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1709 /* Also preserve various other info from the definition. */
1710 if (!new_is_definition)
1712 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1713 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1714 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1715 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1716 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1718 /* Set DECL_INLINE on the declaration if we've got a body
1719 from which to instantiate. */
1720 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1722 DECL_INLINE (newdecl) = 1;
1723 DECL_ABSTRACT_ORIGIN (newdecl)
1724 = DECL_ABSTRACT_ORIGIN (olddecl);
1729 /* If a previous declaration said inline, mark the
1730 definition as inlinable. */
1731 if (DECL_DECLARED_INLINE_P (newdecl)
1732 && !DECL_UNINLINABLE (newdecl))
1733 DECL_INLINE (newdecl) = 1;
1737 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1738 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1740 unsigned olddecl_uid = DECL_UID (olddecl);
1741 tree olddecl_context = DECL_CONTEXT (olddecl);
1743 memcpy ((char *) olddecl + sizeof (struct tree_common),
1744 (char *) newdecl + sizeof (struct tree_common),
1745 sizeof (struct tree_decl) - sizeof (struct tree_common));
1746 DECL_UID (olddecl) = olddecl_uid;
1747 DECL_CONTEXT (olddecl) = olddecl_context;
1750 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1751 so that encode_section_info has a chance to look at the new decl
1752 flags and attributes. */
1753 if (DECL_RTL_SET_P (olddecl)
1754 && (TREE_CODE (olddecl) == FUNCTION_DECL
1755 || (TREE_CODE (olddecl) == VAR_DECL
1756 && TREE_STATIC (olddecl))))
1757 make_decl_rtl (olddecl);
1760 /* Handle when a new declaration NEWDECL has the same name as an old
1761 one OLDDECL in the same binding contour. Prints an error message
1764 If safely possible, alter OLDDECL to look like NEWDECL, and return
1765 true. Otherwise, return false. */
1768 duplicate_decls (tree newdecl, tree olddecl)
1770 tree newtype = NULL, oldtype = NULL;
1772 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1775 merge_decls (newdecl, olddecl, newtype, oldtype);
1780 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1782 warn_if_shadowing (tree new_decl)
1784 struct c_binding *b;
1786 /* Shadow warnings wanted? */
1788 /* No shadow warnings for internally generated vars. */
1789 || DECL_IS_BUILTIN (new_decl)
1790 /* No shadow warnings for vars made for inlining. */
1791 || DECL_FROM_INLINE (new_decl)
1792 /* Don't warn about the parm names in function declarator
1793 within a function declarator. It would be nice to avoid
1794 warning in any function declarator in a declaration, as
1795 opposed to a definition, but there is no way to tell
1796 it's not a definition at this point. */
1797 || (TREE_CODE (new_decl) == PARM_DECL && current_scope->outer->parm_flag))
1800 /* Is anything being shadowed? Invisible decls do not count. */
1801 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1802 if (b->decl && b->decl != new_decl && !b->invisible)
1804 tree old_decl = b->decl;
1806 if (TREE_CODE (old_decl) == PARM_DECL)
1807 warning ("%Jdeclaration of %qD shadows a parameter",
1808 new_decl, new_decl);
1809 else if (DECL_FILE_SCOPE_P (old_decl))
1810 warning ("%Jdeclaration of %qD shadows a global declaration",
1811 new_decl, new_decl);
1812 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1813 && DECL_BUILT_IN (old_decl))
1814 warning ("%Jdeclaration of %qD shadows a built-in function",
1815 new_decl, new_decl);
1817 warning ("%Jdeclaration of %qD shadows a previous local",
1818 new_decl, new_decl);
1820 if (TREE_CODE (old_decl) != FUNCTION_DECL
1821 || !DECL_BUILT_IN (old_decl))
1822 warning ("%Jshadowed declaration is here", old_decl);
1829 /* Subroutine of pushdecl.
1831 X is a TYPE_DECL for a typedef statement. Create a brand new
1832 ..._TYPE node (which will be just a variant of the existing
1833 ..._TYPE node with identical properties) and then install X
1834 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1836 The whole point here is to end up with a situation where each
1837 and every ..._TYPE node the compiler creates will be uniquely
1838 associated with AT MOST one node representing a typedef name.
1839 This way, even though the compiler substitutes corresponding
1840 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1841 early on, later parts of the compiler can always do the reverse
1842 translation and get back the corresponding typedef name. For
1845 typedef struct S MY_TYPE;
1848 Later parts of the compiler might only know that `object' was of
1849 type `struct S' if it were not for code just below. With this
1850 code however, later parts of the compiler see something like:
1852 struct S' == struct S
1853 typedef struct S' MY_TYPE;
1856 And they can then deduce (from the node for type struct S') that
1857 the original object declaration was:
1861 Being able to do this is important for proper support of protoize,
1862 and also for generating precise symbolic debugging information
1863 which takes full account of the programmer's (typedef) vocabulary.
1865 Obviously, we don't want to generate a duplicate ..._TYPE node if
1866 the TYPE_DECL node that we are now processing really represents a
1867 standard built-in type.
1869 Since all standard types are effectively declared at line zero
1870 in the source file, we can easily check to see if we are working
1871 on a standard type by checking the current value of lineno. */
1874 clone_underlying_type (tree x)
1876 if (DECL_IS_BUILTIN (x))
1878 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1879 TYPE_NAME (TREE_TYPE (x)) = x;
1881 else if (TREE_TYPE (x) != error_mark_node
1882 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1884 tree tt = TREE_TYPE (x);
1885 DECL_ORIGINAL_TYPE (x) = tt;
1886 tt = build_variant_type_copy (tt);
1888 TREE_USED (tt) = TREE_USED (x);
1893 /* Record a decl-node X as belonging to the current lexical scope.
1894 Check for errors (such as an incompatible declaration for the same
1895 name already seen in the same scope).
1897 Returns either X or an old decl for the same name.
1898 If an old decl is returned, it may have been smashed
1899 to agree with what X says. */
1904 tree name = DECL_NAME (x);
1905 struct c_scope *scope = current_scope;
1906 struct c_binding *b;
1907 bool nested = false;
1909 /* Functions need the lang_decl data. */
1910 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
1911 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
1913 /* Must set DECL_CONTEXT for everything not at file scope or
1914 DECL_FILE_SCOPE_P won't work. Local externs don't count
1915 unless they have initializers (which generate code). */
1916 if (current_function_decl
1917 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
1918 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
1919 DECL_CONTEXT (x) = current_function_decl;
1921 /* Anonymous decls are just inserted in the scope. */
1924 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
1928 /* First, see if there is another declaration with the same name in
1929 the current scope. If there is, duplicate_decls may do all the
1930 work for us. If duplicate_decls returns false, that indicates
1931 two incompatible decls in the same scope; we are to silently
1932 replace the old one (duplicate_decls has issued all appropriate
1933 diagnostics). In particular, we should not consider possible
1934 duplicates in the external scope, or shadowing. */
1935 b = I_SYMBOL_BINDING (name);
1936 if (b && B_IN_SCOPE (b, scope))
1938 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
1939 && COMPLETE_TYPE_P (TREE_TYPE (x)))
1940 b->inner_comp = false;
1941 if (duplicate_decls (x, b->decl))
1944 goto skip_external_and_shadow_checks;
1947 /* All declarations with external linkage, and all external
1948 references, go in the external scope, no matter what scope is
1949 current. However, the binding in that scope is ignored for
1950 purposes of normal name lookup. A separate binding structure is
1951 created in the requested scope; this governs the normal
1952 visibility of the symbol.
1954 The binding in the externals scope is used exclusively for
1955 detecting duplicate declarations of the same object, no matter
1956 what scope they are in; this is what we do here. (C99 6.2.7p2:
1957 All declarations that refer to the same object or function shall
1958 have compatible type; otherwise, the behavior is undefined.) */
1959 if (DECL_EXTERNAL (x) || scope == file_scope)
1961 tree type = TREE_TYPE (x);
1964 bool type_saved = false;
1965 if (b && !B_IN_EXTERNAL_SCOPE (b)
1966 && (TREE_CODE (b->decl) == FUNCTION_DECL
1967 || TREE_CODE (b->decl) == VAR_DECL)
1968 && DECL_FILE_SCOPE_P (b->decl))
1971 vistype = TREE_TYPE (visdecl);
1973 if (warn_nested_externs
1974 && scope != file_scope
1975 && !DECL_IN_SYSTEM_HEADER (x))
1976 warning ("nested extern declaration of %qD", x);
1978 while (b && !B_IN_EXTERNAL_SCOPE (b))
1980 /* If this decl might be modified, save its type. This is
1981 done here rather than when the decl is first bound
1982 because the type may change after first binding, through
1983 being completed or through attributes being added. If we
1984 encounter multiple such decls, only the first should have
1985 its type saved; the others will already have had their
1986 proper types saved and the types will not have changed as
1987 their scopes will not have been re-entered. */
1988 if (DECL_FILE_SCOPE_P (b->decl) && !type_saved)
1990 b->type = TREE_TYPE (b->decl);
1993 if (B_IN_FILE_SCOPE (b)
1994 && TREE_CODE (b->decl) == VAR_DECL
1995 && TREE_STATIC (b->decl)
1996 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
1997 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
1998 && TREE_CODE (type) == ARRAY_TYPE
1999 && TYPE_DOMAIN (type)
2000 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2001 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2003 /* Array type completed in inner scope, which should be
2004 diagnosed if the completion does not have size 1 and
2005 it does not get completed in the file scope. */
2006 b->inner_comp = true;
2011 /* If a matching external declaration has been found, set its
2012 type to the composite of all the types of that declaration.
2013 After the consistency checks, it will be reset to the
2014 composite of the visible types only. */
2015 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2017 TREE_TYPE (b->decl) = b->type;
2019 /* The point of the same_translation_unit_p check here is,
2020 we want to detect a duplicate decl for a construct like
2021 foo() { extern bar(); } ... static bar(); but not if
2022 they are in different translation units. In any case,
2023 the static does not go in the externals scope. */
2025 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2026 && duplicate_decls (x, b->decl))
2029 thistype = (vistype ? composite_type (vistype, type) : type);
2030 b->type = TREE_TYPE (b->decl);
2031 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2033 = build_type_attribute_variant (thistype,
2034 TYPE_ATTRIBUTES (b->type));
2035 TREE_TYPE (b->decl) = thistype;
2036 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2039 else if (TREE_PUBLIC (x))
2041 if (visdecl && !b && duplicate_decls (x, visdecl))
2043 /* An external declaration at block scope referring to a
2044 visible entity with internal linkage. The composite
2045 type will already be correct for this scope, so we
2046 just need to fall through to make the declaration in
2053 bind (name, x, external_scope, /*invisible=*/true,
2059 /* Similarly, a declaration of a function with static linkage at
2060 block scope must be checked against any existing declaration
2061 of that function at file scope. */
2062 else if (TREE_CODE (x) == FUNCTION_DECL && scope != file_scope
2063 && !TREE_PUBLIC (x) && !DECL_INITIAL (x))
2065 if (warn_nested_externs && !DECL_IN_SYSTEM_HEADER (x))
2066 warning ("nested static declaration of %qD", x);
2068 while (b && !B_IN_FILE_SCOPE (b))
2071 if (b && same_translation_unit_p (x, b->decl)
2072 && duplicate_decls (x, b->decl))
2074 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2079 bind (name, x, file_scope, /*invisible=*/true, /*nested=*/false);
2084 warn_if_shadowing (x);
2086 skip_external_and_shadow_checks:
2087 if (TREE_CODE (x) == TYPE_DECL)
2088 clone_underlying_type (x);
2090 bind (name, x, scope, /*invisible=*/false, nested);
2092 /* If x's type is incomplete because it's based on a
2093 structure or union which has not yet been fully declared,
2094 attach it to that structure or union type, so we can go
2095 back and complete the variable declaration later, if the
2096 structure or union gets fully declared.
2098 If the input is erroneous, we can have error_mark in the type
2099 slot (e.g. "f(void a, ...)") - that doesn't count as an
2101 if (TREE_TYPE (x) != error_mark_node
2102 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2104 tree element = TREE_TYPE (x);
2106 while (TREE_CODE (element) == ARRAY_TYPE)
2107 element = TREE_TYPE (element);
2108 element = TYPE_MAIN_VARIANT (element);
2110 if ((TREE_CODE (element) == RECORD_TYPE
2111 || TREE_CODE (element) == UNION_TYPE)
2112 && (TREE_CODE (x) != TYPE_DECL
2113 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2114 && !COMPLETE_TYPE_P (element))
2115 C_TYPE_INCOMPLETE_VARS (element)
2116 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2121 /* Record X as belonging to file scope.
2122 This is used only internally by the Objective-C front end,
2123 and is limited to its needs. duplicate_decls is not called;
2124 if there is any preexisting decl for this identifier, it is an ICE. */
2127 pushdecl_top_level (tree x)
2130 bool nested = false;
2132 gcc_assert (TREE_CODE (x) == VAR_DECL);
2134 name = DECL_NAME (x);
2136 gcc_assert (!I_SYMBOL_BINDING (name));
2138 if (TREE_PUBLIC (x))
2140 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2144 bind (name, x, file_scope, /*invisible=*/false, nested);
2150 implicit_decl_warning (tree id, tree olddecl)
2152 void (*diag) (const char *, ...);
2153 switch (mesg_implicit_function_declaration)
2156 case 1: diag = warning; break;
2157 case 2: diag = error; break;
2158 default: gcc_unreachable ();
2161 diag (N_("implicit declaration of function %qE"), id);
2163 locate_old_decl (olddecl, diag);
2166 /* Generate an implicit declaration for identifier FUNCTIONID as a
2167 function of type int (). */
2170 implicitly_declare (tree functionid)
2172 struct c_binding *b;
2176 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2178 if (B_IN_SCOPE (b, external_scope))
2187 /* FIXME: Objective-C has weird not-really-builtin functions
2188 which are supposed to be visible automatically. They wind up
2189 in the external scope because they're pushed before the file
2190 scope gets created. Catch this here and rebind them into the
2192 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2194 bind (functionid, decl, file_scope,
2195 /*invisible=*/false, /*nested=*/true);
2200 tree newtype = default_function_type;
2202 TREE_TYPE (decl) = b->type;
2203 /* Implicit declaration of a function already declared
2204 (somehow) in a different scope, or as a built-in.
2205 If this is the first time this has happened, warn;
2206 then recycle the old declaration but with the new type. */
2207 if (!C_DECL_IMPLICIT (decl))
2209 implicit_decl_warning (functionid, decl);
2210 C_DECL_IMPLICIT (decl) = 1;
2212 if (DECL_BUILT_IN (decl))
2214 newtype = build_type_attribute_variant (newtype,
2216 (TREE_TYPE (decl)));
2217 if (!comptypes (newtype, TREE_TYPE (decl)))
2219 warning ("incompatible implicit declaration of built-in"
2220 " function %qD", decl);
2221 newtype = TREE_TYPE (decl);
2226 if (!comptypes (newtype, TREE_TYPE (decl)))
2228 error ("incompatible implicit declaration of function %qD",
2230 locate_old_decl (decl, error);
2233 b->type = TREE_TYPE (decl);
2234 TREE_TYPE (decl) = newtype;
2235 bind (functionid, decl, current_scope,
2236 /*invisible=*/false, /*nested=*/true);
2241 /* Not seen before. */
2242 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2243 DECL_EXTERNAL (decl) = 1;
2244 TREE_PUBLIC (decl) = 1;
2245 C_DECL_IMPLICIT (decl) = 1;
2246 implicit_decl_warning (functionid, 0);
2247 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2249 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2251 /* C89 says implicit declarations are in the innermost block.
2252 So we record the decl in the standard fashion. */
2253 decl = pushdecl (decl);
2255 /* No need to call objc_check_decl here - it's a function type. */
2256 rest_of_decl_compilation (decl, 0, 0);
2258 /* Write a record describing this implicit function declaration
2259 to the prototypes file (if requested). */
2260 gen_aux_info_record (decl, 0, 1, 0);
2262 /* Possibly apply some default attributes to this implicit declaration. */
2263 decl_attributes (&decl, NULL_TREE, 0);
2268 /* Issue an error message for a reference to an undeclared variable
2269 ID, including a reference to a builtin outside of function-call
2270 context. Establish a binding of the identifier to error_mark_node
2271 in an appropriate scope, which will suppress further errors for the
2274 undeclared_variable (tree id)
2276 static bool already = false;
2277 struct c_scope *scope;
2279 if (current_function_decl == 0)
2281 error ("%qE undeclared here (not in a function)", id);
2282 scope = current_scope;
2286 error ("%qE undeclared (first use in this function)", id);
2290 error ("(Each undeclared identifier is reported only once");
2291 error ("for each function it appears in.)");
2295 /* If we are parsing old-style parameter decls, current_function_decl
2296 will be nonnull but current_function_scope will be null. */
2297 scope = current_function_scope ? current_function_scope : current_scope;
2299 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2302 /* Subroutine of lookup_label, declare_label, define_label: construct a
2303 LABEL_DECL with all the proper frills. */
2306 make_label (tree name, location_t location)
2308 tree label = build_decl (LABEL_DECL, name, void_type_node);
2310 DECL_CONTEXT (label) = current_function_decl;
2311 DECL_MODE (label) = VOIDmode;
2312 DECL_SOURCE_LOCATION (label) = location;
2317 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2318 Create one if none exists so far for the current function.
2319 This is called when a label is used in a goto expression or
2320 has its address taken. */
2323 lookup_label (tree name)
2327 if (current_function_decl == 0)
2329 error ("label %qs referenced outside of any function",
2330 IDENTIFIER_POINTER (name));
2334 /* Use a label already defined or ref'd with this name, but not if
2335 it is inherited from a containing function and wasn't declared
2337 label = I_LABEL_DECL (name);
2338 if (label && (DECL_CONTEXT (label) == current_function_decl
2339 || C_DECLARED_LABEL_FLAG (label)))
2341 /* If the label has only been declared, update its apparent
2342 location to point here, for better diagnostics if it
2343 turns out not to have been defined. */
2344 if (!TREE_USED (label))
2345 DECL_SOURCE_LOCATION (label) = input_location;
2349 /* No label binding for that identifier; make one. */
2350 label = make_label (name, input_location);
2352 /* Ordinary labels go in the current function scope. */
2353 bind (name, label, current_function_scope,
2354 /*invisible=*/false, /*nested=*/false);
2358 /* Make a label named NAME in the current function, shadowing silently
2359 any that may be inherited from containing functions or containing
2360 scopes. This is called for __label__ declarations. */
2363 declare_label (tree name)
2365 struct c_binding *b = I_LABEL_BINDING (name);
2368 /* Check to make sure that the label hasn't already been declared
2370 if (b && B_IN_CURRENT_SCOPE (b))
2372 error ("duplicate label declaration %qs", IDENTIFIER_POINTER (name));
2373 locate_old_decl (b->decl, error);
2375 /* Just use the previous declaration. */
2379 label = make_label (name, input_location);
2380 C_DECLARED_LABEL_FLAG (label) = 1;
2382 /* Declared labels go in the current scope. */
2383 bind (name, label, current_scope,
2384 /*invisible=*/false, /*nested=*/false);
2388 /* Define a label, specifying the location in the source file.
2389 Return the LABEL_DECL node for the label, if the definition is valid.
2390 Otherwise return 0. */
2393 define_label (location_t location, tree name)
2395 /* Find any preexisting label with this name. It is an error
2396 if that label has already been defined in this function, or
2397 if there is a containing function with a declared label with
2399 tree label = I_LABEL_DECL (name);
2402 && ((DECL_CONTEXT (label) == current_function_decl
2403 && DECL_INITIAL (label) != 0)
2404 || (DECL_CONTEXT (label) != current_function_decl
2405 && C_DECLARED_LABEL_FLAG (label))))
2407 error ("%Hduplicate label %qD", &location, label);
2408 locate_old_decl (label, error);
2411 else if (label && DECL_CONTEXT (label) == current_function_decl)
2413 /* The label has been used or declared already in this function,
2414 but not defined. Update its location to point to this
2416 DECL_SOURCE_LOCATION (label) = location;
2420 /* No label binding for that identifier; make one. */
2421 label = make_label (name, location);
2423 /* Ordinary labels go in the current function scope. */
2424 bind (name, label, current_function_scope,
2425 /*invisible=*/false, /*nested=*/false);
2428 if (warn_traditional && !in_system_header && lookup_name (name))
2429 warning ("%Htraditional C lacks a separate namespace for labels, "
2430 "identifier %qs conflicts", &location,
2431 IDENTIFIER_POINTER (name));
2433 /* Mark label as having been defined. */
2434 DECL_INITIAL (label) = error_mark_node;
2438 /* Given NAME, an IDENTIFIER_NODE,
2439 return the structure (or union or enum) definition for that name.
2440 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2441 CODE says which kind of type the caller wants;
2442 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2443 If the wrong kind of type is found, an error is reported. */
2446 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2448 struct c_binding *b = I_TAG_BINDING (name);
2454 /* We only care about whether it's in this level if
2455 thislevel_only was set or it might be a type clash. */
2456 if (thislevel_only || TREE_CODE (b->decl) != code)
2458 /* For our purposes, a tag in the external scope is the same as
2459 a tag in the file scope. (Primarily relevant to Objective-C
2460 and its builtin structure tags, which get pushed before the
2461 file scope is created.) */
2462 if (B_IN_CURRENT_SCOPE (b)
2463 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2467 if (thislevel_only && !thislevel)
2470 if (TREE_CODE (b->decl) != code)
2472 /* Definition isn't the kind we were looking for. */
2473 pending_invalid_xref = name;
2474 pending_invalid_xref_location = input_location;
2476 /* If in the same binding level as a declaration as a tag
2477 of a different type, this must not be allowed to
2478 shadow that tag, so give the error immediately.
2479 (For example, "struct foo; union foo;" is invalid.) */
2481 pending_xref_error ();
2486 /* Print an error message now
2487 for a recent invalid struct, union or enum cross reference.
2488 We don't print them immediately because they are not invalid
2489 when used in the `struct foo;' construct for shadowing. */
2492 pending_xref_error (void)
2494 if (pending_invalid_xref != 0)
2495 error ("%H%qs defined as wrong kind of tag",
2496 &pending_invalid_xref_location,
2497 IDENTIFIER_POINTER (pending_invalid_xref));
2498 pending_invalid_xref = 0;
2502 /* Look up NAME in the current scope and its superiors
2503 in the namespace of variables, functions and typedefs.
2504 Return a ..._DECL node of some kind representing its definition,
2505 or return 0 if it is undefined. */
2508 lookup_name (tree name)
2510 struct c_binding *b = I_SYMBOL_BINDING (name);
2511 if (b && !b->invisible)
2516 /* Similar to `lookup_name' but look only at the indicated scope. */
2519 lookup_name_in_scope (tree name, struct c_scope *scope)
2521 struct c_binding *b;
2523 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2524 if (B_IN_SCOPE (b, scope))
2529 /* Create the predefined scalar types of C,
2530 and some nodes representing standard constants (0, 1, (void *) 0).
2531 Initialize the global scope.
2532 Make definitions for built-in primitive functions. */
2535 c_init_decl_processing (void)
2538 tree ptr_ftype_void, ptr_ftype_ptr;
2539 location_t save_loc = input_location;
2541 /* Adds some ggc roots, and reserved words for c-parse.in. */
2544 current_function_decl = 0;
2546 gcc_obstack_init (&parser_obstack);
2548 /* Make the externals scope. */
2550 external_scope = current_scope;
2552 /* Declarations from c_common_nodes_and_builtins must not be associated
2553 with this input file, lest we get differences between using and not
2554 using preprocessed headers. */
2555 #ifdef USE_MAPPED_LOCATION
2556 input_location = BUILTINS_LOCATION;
2558 input_location.file = "<built-in>";
2559 input_location.line = 0;
2562 build_common_tree_nodes (flag_signed_char, false);
2564 c_common_nodes_and_builtins ();
2566 /* In C, comparisons and TRUTH_* expressions have type int. */
2567 truthvalue_type_node = integer_type_node;
2568 truthvalue_true_node = integer_one_node;
2569 truthvalue_false_node = integer_zero_node;
2571 /* Even in C99, which has a real boolean type. */
2572 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2573 boolean_type_node));
2575 endlink = void_list_node;
2576 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2578 = build_function_type (ptr_type_node,
2579 tree_cons (NULL_TREE, ptr_type_node, endlink));
2581 input_location = save_loc;
2583 pedantic_lvalues = true;
2585 make_fname_decl = c_make_fname_decl;
2586 start_fname_decls ();
2589 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2590 decl, NAME is the initialization string and TYPE_DEP indicates whether
2591 NAME depended on the type of the function. As we don't yet implement
2592 delayed emission of static data, we mark the decl as emitted
2593 so it is not placed in the output. Anything using it must therefore pull
2594 out the STRING_CST initializer directly. FIXME. */
2597 c_make_fname_decl (tree id, int type_dep)
2599 const char *name = fname_as_string (type_dep);
2600 tree decl, type, init;
2601 size_t length = strlen (name);
2603 type = build_array_type
2604 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2605 build_index_type (size_int (length)));
2607 decl = build_decl (VAR_DECL, id, type);
2609 TREE_STATIC (decl) = 1;
2610 TREE_READONLY (decl) = 1;
2611 DECL_ARTIFICIAL (decl) = 1;
2613 init = build_string (length + 1, name);
2614 free ((char *) name);
2615 TREE_TYPE (init) = type;
2616 DECL_INITIAL (decl) = init;
2618 TREE_USED (decl) = 1;
2620 if (current_function_decl)
2622 DECL_CONTEXT (decl) = current_function_decl;
2623 bind (id, decl, current_function_scope,
2624 /*invisible=*/false, /*nested=*/false);
2627 finish_decl (decl, init, NULL_TREE);
2632 /* Return a definition for a builtin function named NAME and whose data type
2633 is TYPE. TYPE should be a function type with argument types.
2634 FUNCTION_CODE tells later passes how to compile calls to this function.
2635 See tree.h for its possible values.
2637 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2638 the name to be called if we can't opencode the function. If
2639 ATTRS is nonzero, use that for the function's attribute list. */
2642 builtin_function (const char *name, tree type, int function_code,
2643 enum built_in_class cl, const char *library_name,
2646 tree id = get_identifier (name);
2647 tree decl = build_decl (FUNCTION_DECL, id, type);
2648 TREE_PUBLIC (decl) = 1;
2649 DECL_EXTERNAL (decl) = 1;
2650 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2651 DECL_BUILT_IN_CLASS (decl) = cl;
2652 DECL_FUNCTION_CODE (decl) = function_code;
2654 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2656 /* Should never be called on a symbol with a preexisting meaning. */
2657 gcc_assert (!I_SYMBOL_BINDING (id));
2659 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2661 /* Builtins in the implementation namespace are made visible without
2662 needing to be explicitly declared. See push_file_scope. */
2663 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2665 TREE_CHAIN (decl) = visible_builtins;
2666 visible_builtins = decl;
2669 /* Possibly apply some default attributes to this built-in function. */
2671 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2673 decl_attributes (&decl, NULL_TREE, 0);
2678 /* Called when a declaration is seen that contains no names to declare.
2679 If its type is a reference to a structure, union or enum inherited
2680 from a containing scope, shadow that tag name for the current scope
2681 with a forward reference.
2682 If its type defines a new named structure or union
2683 or defines an enum, it is valid but we need not do anything here.
2684 Otherwise, it is an error. */
2687 shadow_tag (const struct c_declspecs *declspecs)
2689 shadow_tag_warned (declspecs, 0);
2692 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2695 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2697 bool found_tag = false;
2699 pending_invalid_xref = 0;
2701 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2703 tree value = declspecs->type;
2704 enum tree_code code = TREE_CODE (value);
2706 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2707 /* Used to test also that TYPE_SIZE (value) != 0.
2708 That caused warning for `struct foo;' at top level in the file. */
2710 tree name = TYPE_NAME (value);
2717 if (warned != 1 && code != ENUMERAL_TYPE)
2718 /* Empty unnamed enum OK */
2720 pedwarn ("unnamed struct/union that defines no instances");
2726 t = lookup_tag (code, name, 1);
2730 t = make_node (code);
2737 if (warned != 1 && !in_system_header)
2739 pedwarn ("useless type name in empty declaration");
2744 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2746 pedwarn ("useless type name in empty declaration");
2750 if (declspecs->inline_p)
2752 error ("%<inline%> in empty declaration");
2756 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2758 error ("%<auto%> in file-scope empty declaration");
2762 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2764 error ("%<register%> in file-scope empty declaration");
2768 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2770 warning ("useless storage class specifier in empty declaration");
2774 if (!warned && !in_system_header && declspecs->thread_p)
2776 warning ("useless %<__thread%> in empty declaration");
2780 if (!warned && !in_system_header && (declspecs->const_p
2781 || declspecs->volatile_p
2782 || declspecs->restrict_p))
2784 warning ("useless type qualifier in empty declaration");
2791 pedwarn ("empty declaration");
2796 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2797 bits. SPECS represents declaration specifiers that the grammar
2798 only permits to contain type qualifiers and attributes. */
2801 quals_from_declspecs (const struct c_declspecs *specs)
2803 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
2804 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
2805 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
2806 gcc_assert (!specs->type
2807 && !specs->decl_attr
2808 && specs->typespec_word == cts_none
2809 && specs->storage_class == csc_none
2810 && !specs->typedef_p
2811 && !specs->explicit_signed_p
2812 && !specs->deprecated_p
2814 && !specs->long_long_p
2817 && !specs->unsigned_p
2818 && !specs->complex_p
2820 && !specs->thread_p);
2824 /* Construct an array declarator. EXPR is the expression inside [], or
2825 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2826 to the pointer to which a parameter array is converted). STATIC_P is
2827 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2828 is true if the array is [*], a VLA of unspecified length which is
2829 nevertheless a complete type (not currently implemented by GCC),
2830 false otherwise. The field for the contained declarator is left to be
2831 filled in by set_array_declarator_inner. */
2833 struct c_declarator *
2834 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
2837 struct c_declarator *declarator = XOBNEW (&parser_obstack,
2838 struct c_declarator);
2839 declarator->kind = cdk_array;
2840 declarator->declarator = 0;
2841 declarator->u.array.dimen = expr;
2844 declarator->u.array.attrs = quals->attrs;
2845 declarator->u.array.quals = quals_from_declspecs (quals);
2849 declarator->u.array.attrs = NULL_TREE;
2850 declarator->u.array.quals = 0;
2852 declarator->u.array.static_p = static_p;
2853 declarator->u.array.vla_unspec_p = vla_unspec_p;
2854 if (pedantic && !flag_isoc99)
2856 if (static_p || quals != NULL)
2857 pedwarn ("ISO C90 does not support %<static%> or type "
2858 "qualifiers in parameter array declarators");
2860 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
2863 warning ("GCC does not yet properly implement %<[*]%> array declarators");
2867 /* Set the contained declarator of an array declarator. DECL is the
2868 declarator, as constructed by build_array_declarator; INNER is what
2869 appears on the left of the []. ABSTRACT_P is true if it is an
2870 abstract declarator, false otherwise; this is used to reject static
2871 and type qualifiers in abstract declarators, where they are not in
2872 the C99 grammar (subject to possible change in DR#289). */
2874 struct c_declarator *
2875 set_array_declarator_inner (struct c_declarator *decl,
2876 struct c_declarator *inner, bool abstract_p)
2878 decl->declarator = inner;
2879 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
2880 || decl->u.array.attrs != NULL_TREE
2881 || decl->u.array.static_p))
2882 error ("static or type qualifiers in abstract declarator");
2886 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2889 groktypename (struct c_type_name *type_name)
2892 tree attrs = type_name->specs->attrs;
2894 type_name->specs->attrs = NULL_TREE;
2896 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
2899 /* Apply attributes. */
2900 decl_attributes (&type, attrs, 0);
2905 /* Decode a declarator in an ordinary declaration or data definition.
2906 This is called as soon as the type information and variable name
2907 have been parsed, before parsing the initializer if any.
2908 Here we create the ..._DECL node, fill in its type,
2909 and put it on the list of decls for the current context.
2910 The ..._DECL node is returned as the value.
2912 Exception: for arrays where the length is not specified,
2913 the type is left null, to be filled in by `finish_decl'.
2915 Function definitions do not come here; they go to start_function
2916 instead. However, external and forward declarations of functions
2917 do go through here. Structure field declarations are done by
2918 grokfield and not through here. */
2921 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
2922 bool initialized, tree attributes)
2927 /* An object declared as __attribute__((deprecated)) suppresses
2928 warnings of uses of other deprecated items. */
2929 if (lookup_attribute ("deprecated", attributes))
2930 deprecated_state = DEPRECATED_SUPPRESS;
2932 decl = grokdeclarator (declarator, declspecs,
2933 NORMAL, initialized, NULL);
2935 deprecated_state = DEPRECATED_NORMAL;
2937 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2938 && MAIN_NAME_P (DECL_NAME (decl)))
2939 warning ("%J%qD is usually a function", decl, decl);
2942 /* Is it valid for this decl to have an initializer at all?
2943 If not, set INITIALIZED to zero, which will indirectly
2944 tell 'finish_decl' to ignore the initializer once it is parsed. */
2945 switch (TREE_CODE (decl))
2948 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
2953 error ("function %qD is initialized like a variable", decl);
2958 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2959 error ("parameter %qD is initialized", decl);
2964 /* Don't allow initializations for incomplete types except for
2965 arrays which might be completed by the initialization. */
2967 /* This can happen if the array size is an undefined macro.
2968 We already gave a warning, so we don't need another one. */
2969 if (TREE_TYPE (decl) == error_mark_node)
2971 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2973 /* A complete type is ok if size is fixed. */
2975 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2976 || C_DECL_VARIABLE_SIZE (decl))
2978 error ("variable-sized object may not be initialized");
2982 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2984 error ("variable %qD has initializer but incomplete type", decl);
2987 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2989 error ("elements of array %qD have incomplete type", decl);
2992 else if (C_DECL_VARIABLE_SIZE (decl))
2994 /* Although C99 is unclear about whether incomplete arrays
2995 of VLAs themselves count as VLAs, it does not make
2996 sense to permit them to be initialized given that
2997 ordinary VLAs may not be initialized. */
2998 error ("variable-sized object may not be initialized");
3005 if (current_scope == file_scope)
3006 TREE_STATIC (decl) = 1;
3008 /* Tell 'pushdecl' this is an initialized decl
3009 even though we don't yet have the initializer expression.
3010 Also tell 'finish_decl' it may store the real initializer. */
3011 DECL_INITIAL (decl) = error_mark_node;
3014 /* If this is a function declaration, write a record describing it to the
3015 prototypes file (if requested). */
3017 if (TREE_CODE (decl) == FUNCTION_DECL)
3018 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3020 /* ANSI specifies that a tentative definition which is not merged with
3021 a non-tentative definition behaves exactly like a definition with an
3022 initializer equal to zero. (Section 3.7.2)
3024 -fno-common gives strict ANSI behavior, though this tends to break
3025 a large body of code that grew up without this rule.
3027 Thread-local variables are never common, since there's no entrenched
3028 body of code to break, and it allows more efficient variable references
3029 in the presence of dynamic linking. */
3031 if (TREE_CODE (decl) == VAR_DECL
3033 && TREE_PUBLIC (decl)
3034 && !DECL_THREAD_LOCAL (decl)
3036 DECL_COMMON (decl) = 1;
3038 /* Set attributes here so if duplicate decl, will have proper attributes. */
3039 decl_attributes (&decl, attributes, 0);
3041 if (TREE_CODE (decl) == FUNCTION_DECL
3042 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3044 struct c_declarator *ce = declarator;
3046 if (ce->kind == cdk_pointer)
3047 ce = declarator->declarator;
3048 if (ce->kind == cdk_function)
3050 tree args = ce->u.arg_info->parms;
3051 for (; args; args = TREE_CHAIN (args))
3053 tree type = TREE_TYPE (args);
3054 if (type && INTEGRAL_TYPE_P (type)
3055 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3056 DECL_ARG_TYPE (args) = integer_type_node;
3061 if (TREE_CODE (decl) == FUNCTION_DECL
3062 && DECL_DECLARED_INLINE_P (decl)
3063 && DECL_UNINLINABLE (decl)
3064 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3065 warning ("%Jinline function %qD given attribute noinline", decl, decl);
3067 /* Add this decl to the current scope.
3068 TEM may equal DECL or it may be a previous decl of the same name. */
3069 tem = pushdecl (decl);
3071 if (initialized && DECL_EXTERNAL (tem))
3073 DECL_EXTERNAL (tem) = 0;
3074 TREE_STATIC (tem) = 1;
3080 /* Finish processing of a declaration;
3081 install its initial value.
3082 If the length of an array type is not known before,
3083 it must be determined now, from the initial value, or it is an error. */
3086 finish_decl (tree decl, tree init, tree asmspec_tree)
3088 tree type = TREE_TYPE (decl);
3089 int was_incomplete = (DECL_SIZE (decl) == 0);
3090 const char *asmspec = 0;
3092 /* If a name was specified, get the string. */
3093 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3094 && DECL_FILE_SCOPE_P (decl))
3095 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3097 asmspec = TREE_STRING_POINTER (asmspec_tree);
3099 /* If `start_decl' didn't like having an initialization, ignore it now. */
3100 if (init != 0 && DECL_INITIAL (decl) == 0)
3103 /* Don't crash if parm is initialized. */
3104 if (TREE_CODE (decl) == PARM_DECL)
3108 store_init_value (decl, init);
3110 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3111 || TREE_CODE (decl) == FUNCTION_DECL
3112 || TREE_CODE (decl) == FIELD_DECL))
3113 objc_check_decl (decl);
3115 /* Deduce size of array from initialization, if not already known. */
3116 if (TREE_CODE (type) == ARRAY_TYPE
3117 && TYPE_DOMAIN (type) == 0
3118 && TREE_CODE (decl) != TYPE_DECL)
3121 = (TREE_STATIC (decl)
3122 /* Even if pedantic, an external linkage array
3123 may have incomplete type at first. */
3124 ? pedantic && !TREE_PUBLIC (decl)
3125 : !DECL_EXTERNAL (decl));
3127 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3129 /* Get the completed type made by complete_array_type. */
3130 type = TREE_TYPE (decl);
3133 error ("%Jinitializer fails to determine size of %qD", decl, decl);
3135 else if (failure == 2)
3138 error ("%Jarray size missing in %qD", decl, decl);
3139 /* If a `static' var's size isn't known,
3140 make it extern as well as static, so it does not get
3142 If it is not `static', then do not mark extern;
3143 finish_incomplete_decl will give it a default size
3144 and it will get allocated. */
3145 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3146 DECL_EXTERNAL (decl) = 1;
3149 /* TYPE_MAX_VALUE is always one less than the number of elements
3150 in the array, because we start counting at zero. Therefore,
3151 warn only if the value is less than zero. */
3152 else if (pedantic && TYPE_DOMAIN (type) != 0
3153 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3154 error ("%Jzero or negative size array %qD", decl, decl);
3156 layout_decl (decl, 0);
3159 if (TREE_CODE (decl) == VAR_DECL)
3161 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3162 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3163 layout_decl (decl, 0);
3165 if (DECL_SIZE (decl) == 0
3166 /* Don't give an error if we already gave one earlier. */
3167 && TREE_TYPE (decl) != error_mark_node
3168 && (TREE_STATIC (decl)
3169 /* A static variable with an incomplete type
3170 is an error if it is initialized.
3171 Also if it is not file scope.
3172 Otherwise, let it through, but if it is not `extern'
3173 then it may cause an error message later. */
3174 ? (DECL_INITIAL (decl) != 0
3175 || !DECL_FILE_SCOPE_P (decl))
3176 /* An automatic variable with an incomplete type
3178 : !DECL_EXTERNAL (decl)))
3180 error ("%Jstorage size of %qD isn%'t known", decl, decl);
3181 TREE_TYPE (decl) = error_mark_node;
3184 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3185 && DECL_SIZE (decl) != 0)
3187 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3188 constant_expression_warning (DECL_SIZE (decl));
3190 error ("%Jstorage size of %qD isn%'t constant", decl, decl);
3193 if (TREE_USED (type))
3194 TREE_USED (decl) = 1;
3197 /* If this is a function and an assembler name is specified, reset DECL_RTL
3198 so we can give it its new name. Also, update built_in_decls if it
3199 was a normal built-in. */
3200 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3202 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3204 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
3205 set_user_assembler_name (builtin, asmspec);
3206 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
3207 init_block_move_fn (asmspec);
3208 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
3209 init_block_clear_fn (asmspec);
3211 set_user_assembler_name (decl, asmspec);
3214 /* If #pragma weak was used, mark the decl weak now. */
3215 if (current_scope == file_scope)
3216 maybe_apply_pragma_weak (decl);
3218 /* If this is a variable definition, determine its ELF visibility. */
3219 if (TREE_CODE (decl) == VAR_DECL
3220 && TREE_STATIC (decl)
3221 && !DECL_EXTERNAL (decl))
3222 c_determine_visibility (decl);
3224 /* Output the assembler code and/or RTL code for variables and functions,
3225 unless the type is an undefined structure or union.
3226 If not, it will get done when the type is completed. */
3228 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3230 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3231 if (c_dialect_objc ())
3232 objc_check_decl (decl);
3236 /* If this is not a static variable, issue a warning.
3237 It doesn't make any sense to give an ASMSPEC for an
3238 ordinary, non-register local variable. Historically,
3239 GCC has accepted -- but ignored -- the ASMSPEC in
3241 if (!DECL_FILE_SCOPE_P (decl)
3242 && TREE_CODE (decl) == VAR_DECL
3243 && !C_DECL_REGISTER (decl)
3244 && !TREE_STATIC (decl))
3245 warning ("%Jignoring asm-specifier for non-static local "
3246 "variable %qD", decl, decl);
3247 else if (C_DECL_REGISTER (decl))
3248 change_decl_assembler_name (decl, get_identifier (asmspec));
3250 set_user_assembler_name (decl, asmspec);
3253 if (DECL_FILE_SCOPE_P (decl))
3255 if (DECL_INITIAL (decl) == NULL_TREE
3256 || DECL_INITIAL (decl) == error_mark_node)
3257 /* Don't output anything
3258 when a tentative file-scope definition is seen.
3259 But at end of compilation, do output code for them. */
3260 DECL_DEFER_OUTPUT (decl) = 1;
3261 rest_of_decl_compilation (decl, true, 0);
3265 /* In conjunction with an ASMSPEC, the `register'
3266 keyword indicates that we should place the variable
3267 in a particular register. */
3268 if (asmspec && C_DECL_REGISTER (decl))
3270 DECL_HARD_REGISTER (decl) = 1;
3271 /* This cannot be done for a structure with volatile
3272 fields, on which DECL_REGISTER will have been
3274 if (!DECL_REGISTER (decl))
3275 error ("cannot put object with volatile field into register");
3278 if (TREE_CODE (decl) != FUNCTION_DECL)
3280 /* If we're building a variable sized type, and we might be
3281 reachable other than via the top of the current binding
3282 level, then create a new BIND_EXPR so that we deallocate
3283 the object at the right time. */
3284 /* Note that DECL_SIZE can be null due to errors. */
3285 if (DECL_SIZE (decl)
3286 && !TREE_CONSTANT (DECL_SIZE (decl))
3287 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3290 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3291 TREE_SIDE_EFFECTS (bind) = 1;
3293 BIND_EXPR_BODY (bind) = push_stmt_list ();
3295 add_stmt (build_stmt (DECL_EXPR, decl));
3300 if (!DECL_FILE_SCOPE_P (decl))
3302 /* Recompute the RTL of a local array now
3303 if it used to be an incomplete type. */
3305 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3307 /* If we used it already as memory, it must stay in memory. */
3308 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3309 /* If it's still incomplete now, no init will save it. */
3310 if (DECL_SIZE (decl) == 0)
3311 DECL_INITIAL (decl) = 0;
3316 /* If this was marked 'used', be sure it will be output. */
3317 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3318 mark_decl_referenced (decl);
3320 if (TREE_CODE (decl) == TYPE_DECL)
3322 if (!DECL_FILE_SCOPE_P (decl)
3323 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3324 add_stmt (build_stmt (DECL_EXPR, decl));
3326 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3329 /* At the end of a declaration, throw away any variable type sizes
3330 of types defined inside that declaration. There is no use
3331 computing them in the following function definition. */
3332 if (current_scope == file_scope)
3333 get_pending_sizes ();
3335 /* Install a cleanup (aka destructor) if one was given. */
3336 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3338 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3341 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3342 tree cleanup_decl = lookup_name (cleanup_id);
3345 /* Build "cleanup(&decl)" for the destructor. */
3346 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3347 cleanup = build_tree_list (NULL_TREE, cleanup);
3348 cleanup = build_function_call (cleanup_decl, cleanup);
3350 /* Don't warn about decl unused; the cleanup uses it. */
3351 TREE_USED (decl) = 1;
3352 TREE_USED (cleanup_decl) = 1;
3354 /* Initialize EH, if we've been told to do so. */
3355 if (flag_exceptions && !c_eh_initialized_p)
3357 c_eh_initialized_p = true;
3358 eh_personality_libfunc
3359 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3360 ? "__gcc_personality_sj0"
3361 : "__gcc_personality_v0");
3362 using_eh_for_cleanups ();
3365 push_cleanup (decl, cleanup, false);
3370 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3373 grokparm (const struct c_parm *parm)
3375 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3378 decl_attributes (&decl, parm->attrs, 0);
3383 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3384 and push that on the current scope. */
3387 push_parm_decl (const struct c_parm *parm)
3391 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3392 decl_attributes (&decl, parm->attrs, 0);
3394 decl = pushdecl (decl);
3396 finish_decl (decl, NULL_TREE, NULL_TREE);
3399 /* Mark all the parameter declarations to date as forward decls.
3400 Also diagnose use of this extension. */
3403 mark_forward_parm_decls (void)
3405 struct c_binding *b;
3407 if (pedantic && !current_scope->warned_forward_parm_decls)
3409 pedwarn ("ISO C forbids forward parameter declarations");
3410 current_scope->warned_forward_parm_decls = true;
3413 for (b = current_scope->bindings; b; b = b->prev)
3414 if (TREE_CODE (b->decl) == PARM_DECL)
3415 TREE_ASM_WRITTEN (b->decl) = 1;
3418 static GTY(()) int compound_literal_number;
3420 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3421 literal, which may be an incomplete array type completed by the
3422 initializer; INIT is a CONSTRUCTOR that initializes the compound
3426 build_compound_literal (tree type, tree init)
3428 /* We do not use start_decl here because we have a type, not a declarator;
3429 and do not use finish_decl because the decl should be stored inside
3430 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3435 if (type == error_mark_node)
3436 return error_mark_node;
3438 decl = build_decl (VAR_DECL, NULL_TREE, type);
3439 DECL_EXTERNAL (decl) = 0;
3440 TREE_PUBLIC (decl) = 0;
3441 TREE_STATIC (decl) = (current_scope == file_scope);
3442 DECL_CONTEXT (decl) = current_function_decl;
3443 TREE_USED (decl) = 1;
3444 TREE_TYPE (decl) = type;
3445 TREE_READONLY (decl) = TYPE_READONLY (type);
3446 store_init_value (decl, init);
3448 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3450 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3452 gcc_assert (!failure);
3455 type = TREE_TYPE (decl);
3456 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3457 return error_mark_node;
3459 stmt = build_stmt (DECL_EXPR, decl);
3460 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3461 TREE_SIDE_EFFECTS (complit) = 1;
3463 layout_decl (decl, 0);
3465 if (TREE_STATIC (decl))
3467 /* This decl needs a name for the assembler output. We also need
3468 a unique suffix to be added to the name. */
3471 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3472 compound_literal_number);
3473 compound_literal_number++;
3474 DECL_NAME (decl) = get_identifier (name);
3475 DECL_DEFER_OUTPUT (decl) = 1;
3476 DECL_COMDAT (decl) = 1;
3477 DECL_ARTIFICIAL (decl) = 1;
3479 rest_of_decl_compilation (decl, 1, 0);
3485 /* Make TYPE a complete type based on INITIAL_VALUE.
3486 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3487 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3490 complete_array_type (tree type, tree initial_value, int do_default)
3492 tree maxindex = NULL_TREE;
3497 /* Note MAXINDEX is really the maximum index,
3498 one less than the size. */
3499 if (TREE_CODE (initial_value) == STRING_CST)
3502 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3503 maxindex = build_int_cst (NULL_TREE,
3504 (TREE_STRING_LENGTH (initial_value)
3507 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3509 tree elts = CONSTRUCTOR_ELTS (initial_value);
3510 maxindex = build_int_cst (NULL_TREE, -1);
3511 for (; elts; elts = TREE_CHAIN (elts))
3513 if (TREE_PURPOSE (elts))
3514 maxindex = TREE_PURPOSE (elts);
3516 maxindex = fold (build2 (PLUS_EXPR, integer_type_node,
3517 maxindex, integer_one_node));
3522 /* Make an error message unless that happened already. */
3523 if (initial_value != error_mark_node)
3526 /* Prevent further error messages. */
3527 maxindex = build_int_cst (NULL_TREE, 0);
3534 maxindex = build_int_cst (NULL_TREE, 0);
3540 TYPE_DOMAIN (type) = build_index_type (maxindex);
3542 gcc_assert (TREE_TYPE (maxindex));
3545 /* Lay out the type now that we can get the real answer. */
3552 /* Determine whether TYPE is a structure with a flexible array member,
3553 or a union containing such a structure (possibly recursively). */
3556 flexible_array_type_p (tree type)
3559 switch (TREE_CODE (type))
3562 x = TYPE_FIELDS (type);
3565 while (TREE_CHAIN (x) != NULL_TREE)
3567 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3568 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3569 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3570 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3574 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3576 if (flexible_array_type_p (TREE_TYPE (x)))
3585 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3586 replacing with appropriate values if they are invalid. */
3588 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3591 unsigned int max_width;
3592 unsigned HOST_WIDE_INT w;
3593 const char *name = orig_name ? orig_name: _("<anonymous>");
3596 STRIP_NOPS (*width);
3598 /* Detect and ignore out of range field width and process valid
3600 if (TREE_CODE (*width) != INTEGER_CST)
3602 error ("bit-field %qs width not an integer constant", name);
3603 *width = integer_one_node;
3607 constant_expression_warning (*width);
3608 if (tree_int_cst_sgn (*width) < 0)
3610 error ("negative width in bit-field %qs", name);
3611 *width = integer_one_node;
3613 else if (integer_zerop (*width) && orig_name)
3615 error ("zero width for bit-field %qs", name);
3616 *width = integer_one_node;
3620 /* Detect invalid bit-field type. */
3621 if (TREE_CODE (*type) != INTEGER_TYPE
3622 && TREE_CODE (*type) != BOOLEAN_TYPE
3623 && TREE_CODE (*type) != ENUMERAL_TYPE)
3625 error ("bit-field %qs has invalid type", name);
3626 *type = unsigned_type_node;
3629 type_mv = TYPE_MAIN_VARIANT (*type);
3631 && type_mv != integer_type_node
3632 && type_mv != unsigned_type_node
3633 && type_mv != boolean_type_node)
3634 pedwarn ("type of bit-field %qs is a GCC extension", name);
3636 if (type_mv == boolean_type_node)
3637 max_width = CHAR_TYPE_SIZE;
3639 max_width = TYPE_PRECISION (*type);
3641 if (0 < compare_tree_int (*width, max_width))
3643 error ("width of %qs exceeds its type", name);
3645 *width = build_int_cst (NULL_TREE, w);
3648 w = tree_low_cst (*width, 1);
3650 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3652 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3654 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3655 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3656 warning ("%qs is narrower than values of its type", name);
3660 /* Given declspecs and a declarator,
3661 determine the name and type of the object declared
3662 and construct a ..._DECL node for it.
3663 (In one case we can return a ..._TYPE node instead.
3664 For invalid input we sometimes return 0.)
3666 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3668 DECL_CONTEXT says which syntactic context this declaration is in:
3669 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3670 FUNCDEF for a function definition. Like NORMAL but a few different
3671 error messages in each case. Return value may be zero meaning
3672 this definition is too screwy to try to parse.
3673 PARM for a parameter declaration (either within a function prototype
3674 or before a function body). Make a PARM_DECL, or return void_type_node.
3675 TYPENAME if for a typename (in a cast or sizeof).
3676 Don't make a DECL node; just return the ..._TYPE node.
3677 FIELD for a struct or union field; make a FIELD_DECL.
3678 INITIALIZED is true if the decl has an initializer.
3679 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3680 representing the width of the bit-field.
3682 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3683 It may also be so in the PARM case, for a prototype where the
3684 argument type is specified but not the name.
3686 This function is where the complicated C meanings of `static'
3687 and `extern' are interpreted. */
3690 grokdeclarator (const struct c_declarator *declarator,
3691 struct c_declspecs *declspecs,
3692 enum decl_context decl_context, bool initialized, tree *width)
3694 tree type = declspecs->type;
3695 bool threadp = declspecs->thread_p;
3696 enum c_storage_class storage_class = declspecs->storage_class;
3700 int type_quals = TYPE_UNQUALIFIED;
3701 const char *name, *orig_name;
3702 tree typedef_type = 0;
3703 int funcdef_flag = 0;
3704 bool funcdef_syntax = false;
3705 int size_varies = 0;
3706 tree decl_attr = declspecs->decl_attr;
3707 int array_ptr_quals = TYPE_UNQUALIFIED;
3708 tree array_ptr_attrs = NULL_TREE;
3709 int array_parm_static = 0;
3710 tree returned_attrs = NULL_TREE;
3711 bool bitfield = width != NULL;
3713 struct c_arg_info *arg_info = 0;
3715 if (decl_context == FUNCDEF)
3716 funcdef_flag = 1, decl_context = NORMAL;
3718 /* Look inside a declarator for the name being declared
3719 and get it as a string, for an error message. */
3721 const struct c_declarator *decl = declarator;
3730 funcdef_syntax = (decl->kind == cdk_function);
3731 decl = decl->declarator;
3735 decl = decl->declarator;
3740 name = IDENTIFIER_POINTER (decl->u.id);
3752 /* A function definition's declarator must have the form of
3753 a function declarator. */
3755 if (funcdef_flag && !funcdef_syntax)
3758 /* If this looks like a function definition, make it one,
3759 even if it occurs where parms are expected.
3760 Then store_parm_decls will reject it and not use it as a parm. */
3761 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3762 decl_context = PARM;
3764 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3765 warn_deprecated_use (declspecs->type);
3767 typedef_type = type;
3768 size_varies = C_TYPE_VARIABLE_SIZE (type);
3770 /* Diagnose defaulting to "int". */
3772 if (declspecs->default_int_p && !in_system_header)
3774 /* Issue a warning if this is an ISO C 99 program or if
3775 -Wreturn-type and this is a function, or if -Wimplicit;
3776 prefer the former warning since it is more explicit. */
3777 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3779 warn_about_return_type = 1;
3780 else if (warn_implicit_int || flag_isoc99)
3781 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
3784 /* Adjust the type if a bit-field is being declared,
3785 -funsigned-bitfields applied and the type is not explicitly
3787 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
3788 && TREE_CODE (type) == INTEGER_TYPE)
3789 type = c_common_unsigned_type (type);
3791 /* Check the type and width of a bit-field. */
3793 check_bitfield_type_and_width (&type, width, orig_name);
3795 /* Figure out the type qualifiers for the declaration. There are
3796 two ways a declaration can become qualified. One is something
3797 like `const int i' where the `const' is explicit. Another is
3798 something like `typedef const int CI; CI i' where the type of the
3799 declaration contains the `const'. A third possibility is that
3800 there is a type qualifier on the element type of a typedefed
3801 array type, in which case we should extract that qualifier so
3802 that c_apply_type_quals_to_decls receives the full list of
3803 qualifiers to work with (C90 is not entirely clear about whether
3804 duplicate qualifiers should be diagnosed in this case, but it
3805 seems most appropriate to do so). */
3806 element_type = strip_array_types (type);
3807 constp = declspecs->const_p + TYPE_READONLY (element_type);
3808 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
3809 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
3810 if (pedantic && !flag_isoc99)
3813 pedwarn ("duplicate %<const%>");
3815 pedwarn ("duplicate %<restrict%>");
3817 pedwarn ("duplicate %<volatile%>");
3819 if (!flag_gen_aux_info && (TYPE_QUALS (type)))
3820 type = TYPE_MAIN_VARIANT (type);
3821 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3822 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3823 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3825 /* Warn about storage classes that are invalid for certain
3826 kinds of declarations (parameters, typenames, etc.). */
3830 || storage_class == csc_auto
3831 || storage_class == csc_register
3832 || storage_class == csc_typedef))
3834 if (storage_class == csc_auto
3835 && (pedantic || current_scope == file_scope))
3836 pedwarn ("function definition declared %<auto%>");
3837 if (storage_class == csc_register)
3838 error ("function definition declared %<register%>");
3839 if (storage_class == csc_typedef)
3840 error ("function definition declared %<typedef%>");
3842 error ("function definition declared %<__thread%>");
3844 if (storage_class == csc_auto
3845 || storage_class == csc_register
3846 || storage_class == csc_typedef)
3847 storage_class = csc_none;
3849 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
3851 if (decl_context == PARM && storage_class == csc_register)
3855 switch (decl_context)
3858 error ("storage class specified for structure field %qs",
3862 error ("storage class specified for parameter %qs", name);
3865 error ("storage class specified for typename");
3868 storage_class = csc_none;
3872 else if (storage_class == csc_extern
3876 /* 'extern' with initialization is invalid if not at file scope. */
3877 if (current_scope == file_scope)
3878 warning ("%qs initialized and declared %<extern%>", name);
3880 error ("%qs has both %<extern%> and initializer", name);
3882 else if (current_scope == file_scope)
3884 if (storage_class == csc_auto)
3885 error ("file-scope declaration of %qs specifies %<auto%>", name);
3886 if (pedantic && storage_class == csc_register)
3887 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
3891 if (storage_class == csc_extern && funcdef_flag)
3892 error ("nested function %qs declared %<extern%>", name);
3893 else if (threadp && storage_class == csc_none)
3895 error ("function-scope %qs implicitly auto and declared "
3902 /* Now figure out the structure of the declarator proper.
3903 Descend through it, creating more complex types, until we reach
3904 the declared identifier (or NULL_TREE, in an absolute declarator). */
3906 while (declarator && declarator->kind != cdk_id)
3908 if (type == error_mark_node)
3910 declarator = declarator->declarator;
3914 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
3915 a cdk_pointer (for *...),
3916 a cdk_function (for ...(...)),
3917 a cdk_attrs (for nested attributes),
3918 or a cdk_id (for the name being declared
3919 or the place in an absolute declarator
3920 where the name was omitted).
3921 For the last case, we have just exited the loop.
3923 At this point, TYPE is the type of elements of an array,
3924 or for a function to return, or for a pointer to point to.
3925 After this sequence of ifs, TYPE is the type of the
3926 array or function or pointer, and DECLARATOR has had its
3927 outermost layer removed. */
3929 if (array_ptr_quals != TYPE_UNQUALIFIED
3930 || array_ptr_attrs != NULL_TREE
3931 || array_parm_static)
3933 /* Only the innermost declarator (making a parameter be of
3934 array type which is converted to pointer type)
3935 may have static or type qualifiers. */
3936 error ("static or type qualifiers in non-parameter array declarator");
3937 array_ptr_quals = TYPE_UNQUALIFIED;
3938 array_ptr_attrs = NULL_TREE;
3939 array_parm_static = 0;
3942 switch (declarator->kind)
3946 /* A declarator with embedded attributes. */
3947 tree attrs = declarator->u.attrs;
3948 const struct c_declarator *inner_decl;
3950 declarator = declarator->declarator;
3951 inner_decl = declarator;
3952 while (inner_decl->kind == cdk_attrs)
3953 inner_decl = inner_decl->declarator;
3954 if (inner_decl->kind == cdk_id)
3955 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3956 else if (inner_decl->kind == cdk_function)
3957 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3958 else if (inner_decl->kind == cdk_array)
3959 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3960 returned_attrs = decl_attributes (&type,
3961 chainon (returned_attrs, attrs),
3967 tree itype = NULL_TREE;
3968 tree size = declarator->u.array.dimen;
3969 /* The index is a signed object `sizetype' bits wide. */
3970 tree index_type = c_common_signed_type (sizetype);
3972 array_ptr_quals = declarator->u.array.quals;
3973 array_ptr_attrs = declarator->u.array.attrs;
3974 array_parm_static = declarator->u.array.static_p;
3976 declarator = declarator->declarator;
3978 /* Check for some types that there cannot be arrays of. */
3980 if (VOID_TYPE_P (type))
3982 error ("declaration of %qs as array of voids", name);
3983 type = error_mark_node;
3986 if (TREE_CODE (type) == FUNCTION_TYPE)
3988 error ("declaration of %qs as array of functions", name);
3989 type = error_mark_node;
3992 if (pedantic && !in_system_header && flexible_array_type_p (type))
3993 pedwarn ("invalid use of structure with flexible array member");
3995 if (size == error_mark_node)
3996 type = error_mark_node;
3998 if (type == error_mark_node)
4001 /* If size was specified, set ITYPE to a range-type for
4002 that size. Otherwise, ITYPE remains null. finish_decl
4003 may figure it out from an initial value. */
4007 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4009 STRIP_TYPE_NOPS (size);
4011 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4013 error ("size of array %qs has non-integer type", name);
4014 size = integer_one_node;
4017 if (pedantic && integer_zerop (size))
4018 pedwarn ("ISO C forbids zero-size array %qs", name);
4020 if (TREE_CODE (size) == INTEGER_CST)
4022 constant_expression_warning (size);
4023 if (tree_int_cst_sgn (size) < 0)
4025 error ("size of array %qs is negative", name);
4026 size = integer_one_node;
4031 /* Make sure the array size remains visibly
4032 nonconstant even if it is (eg) a const variable
4033 with known value. */
4036 if (!flag_isoc99 && pedantic)
4038 if (TREE_CONSTANT (size))
4039 pedwarn ("ISO C90 forbids array %qs whose size "
4040 "can%'t be evaluated",
4043 pedwarn ("ISO C90 forbids variable-size array %qs",
4048 if (integer_zerop (size))
4050 /* A zero-length array cannot be represented with
4051 an unsigned index type, which is what we'll
4052 get with build_index_type. Create an
4053 open-ended range instead. */
4054 itype = build_range_type (sizetype, size, NULL_TREE);
4058 /* Compute the maximum valid index, that is, size
4059 - 1. Do the calculation in index_type, so that
4060 if it is a variable the computations will be
4061 done in the proper mode. */
4062 itype = fold (build2 (MINUS_EXPR, index_type,
4063 convert (index_type, size),
4064 convert (index_type,
4067 /* If that overflowed, the array is too big. ???
4068 While a size of INT_MAX+1 technically shouldn't
4069 cause an overflow (because we subtract 1), the
4070 overflow is recorded during the conversion to
4071 index_type, before the subtraction. Handling
4072 this case seems like an unnecessary
4074 if (TREE_OVERFLOW (itype))
4076 error ("size of array %qs is too large", name);
4077 type = error_mark_node;
4082 itype = variable_size (itype);
4083 itype = build_index_type (itype);
4086 else if (decl_context == FIELD)
4088 if (pedantic && !flag_isoc99 && !in_system_header)
4089 pedwarn ("ISO C90 does not support flexible array members");
4091 /* ISO C99 Flexible array members are effectively
4092 identical to GCC's zero-length array extension. */
4093 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4096 /* If pedantic, complain about arrays of incomplete types. */
4097 if (pedantic && !COMPLETE_TYPE_P (type))
4098 pedwarn ("array type has incomplete element type");
4100 /* Build the array type itself, then merge any constancy
4101 or volatility into the target type. We must do it in
4102 this order to ensure that the TYPE_MAIN_VARIANT field
4103 of the array type is set correctly. */
4104 type = build_array_type (type, itype);
4106 type = c_build_qualified_type (type, type_quals);
4109 C_TYPE_VARIABLE_SIZE (type) = 1;
4111 /* The GCC extension for zero-length arrays differs from
4112 ISO flexible array members in that sizeof yields
4114 if (size && integer_zerop (size))
4117 TYPE_SIZE (type) = bitsize_zero_node;
4118 TYPE_SIZE_UNIT (type) = size_zero_node;
4120 else if (declarator->kind == cdk_pointer)
4121 /* We can never complete an array type which is the
4122 target of a pointer, so go ahead and lay it out. */
4125 if (decl_context != PARM
4126 && (array_ptr_quals != TYPE_UNQUALIFIED
4127 || array_ptr_attrs != NULL_TREE
4128 || array_parm_static))
4130 error ("static or type qualifiers in non-parameter array declarator");
4131 array_ptr_quals = TYPE_UNQUALIFIED;
4132 array_ptr_attrs = NULL_TREE;
4133 array_parm_static = 0;
4139 /* Say it's a definition only for the declarator closest
4140 to the identifier, apart possibly from some
4142 bool really_funcdef = false;
4146 const struct c_declarator *t = declarator->declarator;
4147 while (t->kind == cdk_attrs)
4149 really_funcdef = (t->kind == cdk_id);
4152 /* Declaring a function type. Make sure we have a valid
4153 type for the function to return. */
4154 if (type == error_mark_node)
4159 /* Warn about some types functions can't return. */
4160 if (TREE_CODE (type) == FUNCTION_TYPE)
4162 error ("%qs declared as function returning a function", name);
4163 type = integer_type_node;
4165 if (TREE_CODE (type) == ARRAY_TYPE)
4167 error ("%qs declared as function returning an array", name);
4168 type = integer_type_node;
4171 /* Construct the function type and go to the next
4172 inner layer of declarator. */
4173 arg_info = declarator->u.arg_info;
4174 arg_types = grokparms (arg_info, really_funcdef);
4176 /* Type qualifiers before the return type of the function
4177 qualify the return type, not the function type. */
4180 /* Type qualifiers on a function return type are
4181 normally permitted by the standard but have no
4182 effect, so give a warning at -Wreturn-type.
4183 Qualifiers on a void return type are banned on
4184 function definitions in ISO C; GCC used to used
4185 them for noreturn functions. */
4186 if (VOID_TYPE_P (type) && really_funcdef)
4187 pedwarn ("function definition has qualified void return type");
4188 else if (warn_return_type)
4189 warning ("type qualifiers ignored on function return type");
4191 type = c_build_qualified_type (type, type_quals);
4193 type_quals = TYPE_UNQUALIFIED;
4195 type = build_function_type (type, arg_types);
4196 declarator = declarator->declarator;
4198 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4199 the formal parameter list of this FUNCTION_TYPE to point to
4200 the FUNCTION_TYPE node itself. */
4204 for (link = arg_info->tags;
4206 link = TREE_CHAIN (link))
4207 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4213 /* Merge any constancy or volatility into the target type
4216 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4218 pedwarn ("ISO C forbids qualified function types");
4220 type = c_build_qualified_type (type, type_quals);
4223 type = build_pointer_type (type);
4225 /* Process type qualifiers (such as const or volatile)
4226 that were given inside the `*'. */
4227 type_quals = declarator->u.pointer_quals;
4229 declarator = declarator->declarator;
4237 /* Now TYPE has the actual type. */
4239 /* Did array size calculations overflow? */
4241 if (TREE_CODE (type) == ARRAY_TYPE
4242 && COMPLETE_TYPE_P (type)
4243 && TREE_OVERFLOW (TYPE_SIZE (type)))
4245 error ("size of array %qs is too large", name);
4246 /* If we proceed with the array type as it is, we'll eventually
4247 crash in tree_low_cst(). */
4248 type = error_mark_node;
4251 /* If this is declaring a typedef name, return a TYPE_DECL. */
4253 if (storage_class == csc_typedef)
4256 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4258 pedwarn ("ISO C forbids qualified function types");
4260 type = c_build_qualified_type (type, type_quals);
4261 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4262 if (declspecs->explicit_signed_p)
4263 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4264 decl_attributes (&decl, returned_attrs, 0);
4265 if (declspecs->inline_p)
4266 pedwarn ("%Jtypedef %qD declared %<inline%>", decl, decl);
4270 /* Detect the case of an array type of unspecified size
4271 which came, as such, direct from a typedef name.
4272 We must copy the type, so that each identifier gets
4273 a distinct type, so that each identifier's size can be
4274 controlled separately by its own initializer. */
4276 if (type != 0 && typedef_type != 0
4277 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4278 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4280 type = build_array_type (TREE_TYPE (type), 0);
4282 C_TYPE_VARIABLE_SIZE (type) = 1;
4285 /* If this is a type name (such as, in a cast or sizeof),
4286 compute the type and return it now. */
4288 if (decl_context == TYPENAME)
4290 /* Note that the grammar rejects storage classes in typenames
4292 gcc_assert (storage_class == csc_none && !threadp
4293 && !declspecs->inline_p);
4294 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4296 pedwarn ("ISO C forbids const or volatile function types");
4298 type = c_build_qualified_type (type, type_quals);
4299 decl_attributes (&type, returned_attrs, 0);
4303 /* Aside from typedefs and type names (handle above),
4304 `void' at top level (not within pointer)
4305 is allowed only in public variables.
4306 We don't complain about parms either, but that is because
4307 a better error message can be made later. */
4309 if (VOID_TYPE_P (type) && decl_context != PARM
4310 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4311 && (storage_class == csc_extern
4312 || (current_scope == file_scope
4313 && !(storage_class == csc_static
4314 || storage_class == csc_register)))))
4316 error ("variable or field %qs declared void", name);
4317 type = integer_type_node;
4320 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4321 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4326 if (decl_context == PARM)
4328 tree type_as_written;
4331 /* A parameter declared as an array of T is really a pointer to T.
4332 One declared as a function is really a pointer to a function. */
4334 if (TREE_CODE (type) == ARRAY_TYPE)
4336 /* Transfer const-ness of array into that of type pointed to. */
4337 type = TREE_TYPE (type);
4339 type = c_build_qualified_type (type, type_quals);
4340 type = build_pointer_type (type);
4341 type_quals = array_ptr_quals;
4343 /* We don't yet implement attributes in this context. */
4344 if (array_ptr_attrs != NULL_TREE)
4345 warning ("attributes in parameter array declarator ignored");
4349 else if (TREE_CODE (type) == FUNCTION_TYPE)
4351 if (pedantic && type_quals)
4352 pedwarn ("ISO C forbids qualified function types");
4354 type = c_build_qualified_type (type, type_quals);
4355 type = build_pointer_type (type);
4356 type_quals = TYPE_UNQUALIFIED;
4358 else if (type_quals)
4359 type = c_build_qualified_type (type, type_quals);
4361 type_as_written = type;
4363 decl = build_decl (PARM_DECL, declarator->u.id, type);
4365 C_DECL_VARIABLE_SIZE (decl) = 1;
4367 /* Compute the type actually passed in the parmlist,
4368 for the case where there is no prototype.
4369 (For example, shorts and chars are passed as ints.)
4370 When there is a prototype, this is overridden later. */
4372 if (type == error_mark_node)
4373 promoted_type = type;
4375 promoted_type = c_type_promotes_to (type);
4377 DECL_ARG_TYPE (decl) = promoted_type;
4378 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4379 if (declspecs->inline_p)
4380 pedwarn ("%Jparameter %qD declared %<inline%>", decl, decl);
4382 else if (decl_context == FIELD)
4384 /* Note that the grammar rejects storage classes in typenames
4386 gcc_assert (storage_class == csc_none && !threadp
4387 && !declspecs->inline_p);
4389 /* Structure field. It may not be a function. */
4391 if (TREE_CODE (type) == FUNCTION_TYPE)
4393 error ("field %qs declared as a function", name);
4394 type = build_pointer_type (type);
4396 else if (TREE_CODE (type) != ERROR_MARK
4397 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4399 error ("field %qs has incomplete type", name);
4400 type = error_mark_node;
4402 /* Move type qualifiers down to element of an array. */
4403 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4404 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4406 TYPE_DOMAIN (type));
4407 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4408 DECL_NONADDRESSABLE_P (decl) = bitfield;
4411 C_DECL_VARIABLE_SIZE (decl) = 1;
4413 else if (TREE_CODE (type) == FUNCTION_TYPE)
4415 if (storage_class == csc_register || threadp)
4416 error ("invalid storage class for function %qs", name);
4417 else if (current_scope != file_scope)
4419 /* Function declaration not at file scope. Storage
4420 classes other than `extern' are not allowed, C99
4421 6.7.1p5, and `extern' makes no difference. However,
4422 GCC allows 'auto', perhaps with 'inline', to support
4423 nested functions. */
4424 if (storage_class == csc_auto)
4427 pedwarn ("invalid storage class for function %qs", name);
4429 if (storage_class == csc_static)
4430 error ("invalid storage class for function %qs", name);
4433 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4434 decl = build_decl_attribute_variant (decl, decl_attr);
4436 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4438 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4439 pedwarn ("ISO C forbids qualified function types");
4441 /* GNU C interprets a volatile-qualified function type to indicate
4442 that the function does not return. */
4443 if ((type_quals & TYPE_QUAL_VOLATILE)
4444 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4445 warning ("%<noreturn%> function returns non-void value");
4447 /* Every function declaration is an external reference
4448 (DECL_EXTERNAL) except for those which are not at file
4449 scope and are explicitly declared "auto". This is
4450 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4451 GCC to signify a forward declaration of a nested function. */
4452 if (storage_class == csc_auto && current_scope != file_scope)
4453 DECL_EXTERNAL (decl) = 0;
4455 DECL_EXTERNAL (decl) = 1;
4457 /* Record absence of global scope for `static' or `auto'. */
4459 = !(storage_class == csc_static || storage_class == csc_auto);
4461 /* For a function definition, record the argument information
4462 block where store_parm_decls will look for it. */
4464 current_function_arg_info = arg_info;
4466 if (declspecs->default_int_p)
4467 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4469 /* Record presence of `inline', if it is reasonable. */
4470 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4472 if (declspecs->inline_p)
4473 pedwarn ("cannot inline function %<main%>");
4475 else if (declspecs->inline_p)
4477 /* Record that the function is declared `inline'. */
4478 DECL_DECLARED_INLINE_P (decl) = 1;
4480 /* Do not mark bare declarations as DECL_INLINE. Doing so
4481 in the presence of multiple declarations can result in
4482 the abstract origin pointing between the declarations,
4483 which will confuse dwarf2out. */
4486 DECL_INLINE (decl) = 1;
4487 if (storage_class == csc_extern)
4488 current_extern_inline = 1;
4491 /* If -finline-functions, assume it can be inlined. This does
4492 two things: let the function be deferred until it is actually
4493 needed, and let dwarf2 know that the function is inlinable. */
4494 else if (flag_inline_trees == 2 && initialized)
4495 DECL_INLINE (decl) = 1;
4499 /* It's a variable. */
4500 /* An uninitialized decl with `extern' is a reference. */
4501 int extern_ref = !initialized && storage_class == csc_extern;
4503 /* Move type qualifiers down to element of an array. */
4504 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4506 int saved_align = TYPE_ALIGN(type);
4507 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4509 TYPE_DOMAIN (type));
4510 TYPE_ALIGN (type) = saved_align;
4512 else if (type_quals)
4513 type = c_build_qualified_type (type, type_quals);
4515 /* C99 6.2.2p7: It is invalid (compile-time undefined
4516 behavior) to create an 'extern' declaration for a
4517 variable if there is a global declaration that is
4518 'static' and the global declaration is not visible.
4519 (If the static declaration _is_ currently visible,
4520 the 'extern' declaration is taken to refer to that decl.) */
4521 if (extern_ref && current_scope != file_scope)
4523 tree global_decl = identifier_global_value (declarator->u.id);
4524 tree visible_decl = lookup_name (declarator->u.id);
4527 && global_decl != visible_decl
4528 && TREE_CODE (global_decl) == VAR_DECL
4529 && !TREE_PUBLIC (global_decl))
4530 error ("variable previously declared %<static%> redeclared "
4534 decl = build_decl (VAR_DECL, declarator->u.id, type);
4536 C_DECL_VARIABLE_SIZE (decl) = 1;
4538 if (declspecs->inline_p)
4539 pedwarn ("%Jvariable %qD declared %<inline%>", decl, decl);
4541 /* At file scope, an initialized extern declaration may follow
4542 a static declaration. In that case, DECL_EXTERNAL will be
4543 reset later in start_decl. */
4544 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4546 /* At file scope, the presence of a `static' or `register' storage
4547 class specifier, or the absence of all storage class specifiers
4548 makes this declaration a definition (perhaps tentative). Also,
4549 the absence of both `static' and `register' makes it public. */
4550 if (current_scope == file_scope)
4552 TREE_PUBLIC (decl) = !(storage_class == csc_static
4553 || storage_class == csc_register);
4554 TREE_STATIC (decl) = !extern_ref;
4556 /* Not at file scope, only `static' makes a static definition. */
4559 TREE_STATIC (decl) = (storage_class == csc_static);
4560 TREE_PUBLIC (decl) = extern_ref;
4565 if (targetm.have_tls)
4566 DECL_THREAD_LOCAL (decl) = 1;
4568 /* A mere warning is sure to result in improper semantics
4569 at runtime. Don't bother to allow this to compile. */
4570 error ("thread-local storage not supported for this target");
4574 /* Record `register' declaration for warnings on &
4575 and in case doing stupid register allocation. */
4577 if (storage_class == csc_register)
4579 C_DECL_REGISTER (decl) = 1;
4580 DECL_REGISTER (decl) = 1;
4583 /* Record constancy and volatility. */
4584 c_apply_type_quals_to_decl (type_quals, decl);
4586 /* If a type has volatile components, it should be stored in memory.
4587 Otherwise, the fact that those components are volatile
4588 will be ignored, and would even crash the compiler. */
4589 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4591 /* It is not an error for a structure with volatile fields to
4592 be declared register, but reset DECL_REGISTER since it
4593 cannot actually go in a register. */
4594 int was_reg = C_DECL_REGISTER (decl);
4595 C_DECL_REGISTER (decl) = 0;
4596 DECL_REGISTER (decl) = 0;
4597 c_mark_addressable (decl);
4598 C_DECL_REGISTER (decl) = was_reg;
4601 /* This is the earliest point at which we might know the assembler
4602 name of a variable. Thus, if it's known before this, die horribly. */
4603 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4605 decl_attributes (&decl, returned_attrs, 0);
4611 /* Decode the parameter-list info for a function type or function definition.
4612 The argument is the value returned by `get_parm_info' (or made in parse.y
4613 if there is an identifier list instead of a parameter decl list).
4614 These two functions are separate because when a function returns
4615 or receives functions then each is called multiple times but the order
4616 of calls is different. The last call to `grokparms' is always the one
4617 that contains the formal parameter names of a function definition.
4619 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4621 FUNCDEF_FLAG is true for a function definition, false for
4622 a mere declaration. A nonempty identifier-list gets an error message
4623 when FUNCDEF_FLAG is false. */
4626 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4628 tree arg_types = arg_info->types;
4630 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4631 && !in_system_header)
4632 warning ("function declaration isn%'t a prototype");
4634 if (arg_types == error_mark_node)
4635 return 0; /* don't set TYPE_ARG_TYPES in this case */
4637 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4640 pedwarn ("parameter names (without types) in function declaration");
4642 arg_info->parms = arg_info->types;
4643 arg_info->types = 0;
4648 tree parm, type, typelt;
4649 unsigned int parmno;
4651 /* If there is a parameter of incomplete type in a definition,
4652 this is an error. In a declaration this is valid, and a
4653 struct or union type may be completed later, before any calls
4654 or definition of the function. In the case where the tag was
4655 first declared within the parameter list, a warning has
4656 already been given. If a parameter has void type, then
4657 however the function cannot be defined or called, so
4660 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4662 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4664 type = TREE_VALUE (typelt);
4665 if (type == error_mark_node)
4668 if (!COMPLETE_TYPE_P (type))
4672 if (DECL_NAME (parm))
4673 error ("%Jparameter %u (%qD) has incomplete type",
4674 parm, parmno, parm);
4676 error ("%Jparameter %u has incomplete type",
4679 TREE_VALUE (typelt) = error_mark_node;
4680 TREE_TYPE (parm) = error_mark_node;
4682 else if (VOID_TYPE_P (type))
4684 if (DECL_NAME (parm))
4685 warning ("%Jparameter %u (%qD) has void type",
4686 parm, parmno, parm);
4688 warning ("%Jparameter %u has void type",
4697 /* Take apart the current scope and return a c_arg_info structure with
4698 info on a parameter list just parsed.
4700 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4702 ELLIPSIS being true means the argument list ended in '...' so don't
4703 append a sentinel (void_list_node) to the end of the type-list. */
4706 get_parm_info (bool ellipsis)
4708 struct c_binding *b = current_scope->bindings;
4709 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4716 static bool explained_incomplete_types = false;
4717 bool gave_void_only_once_err = false;
4719 arg_info->parms = 0;
4721 arg_info->types = 0;
4722 arg_info->others = 0;
4724 /* The bindings in this scope must not get put into a block.
4725 We will take care of deleting the binding nodes. */
4726 current_scope->bindings = 0;
4728 /* This function is only called if there was *something* on the
4732 /* A parameter list consisting solely of 'void' indicates that the
4733 function takes no arguments. But if the 'void' is qualified
4734 (by 'const' or 'volatile'), or has a storage class specifier
4735 ('register'), then the behavior is undefined; issue an error.
4736 Typedefs for 'void' are OK (see DR#157). */
4737 if (b->prev == 0 /* one binding */
4738 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4739 && !DECL_NAME (b->decl) /* anonymous */
4740 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4742 if (TREE_THIS_VOLATILE (b->decl)
4743 || TREE_READONLY (b->decl)
4744 || C_DECL_REGISTER (b->decl))
4745 error ("%<void%> as only parameter may not be qualified");
4747 /* There cannot be an ellipsis. */
4749 error ("%<void%> must be the only parameter");
4751 arg_info->types = void_list_node;
4756 types = void_list_node;
4758 /* Break up the bindings list into parms, tags, types, and others;
4759 apply sanity checks; purge the name-to-decl bindings. */
4762 tree decl = b->decl;
4763 tree type = TREE_TYPE (decl);
4764 const char *keyword;
4766 switch (TREE_CODE (decl))
4771 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4772 I_SYMBOL_BINDING (b->id) = b->shadowed;
4775 /* Check for forward decls that never got their actual decl. */
4776 if (TREE_ASM_WRITTEN (decl))
4777 error ("%Jparameter %qD has just a forward declaration",
4779 /* Check for (..., void, ...) and issue an error. */
4780 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4782 if (!gave_void_only_once_err)
4784 error ("%<void%> must be the only parameter");
4785 gave_void_only_once_err = true;
4790 /* Valid parameter, add it to the list. */
4791 TREE_CHAIN (decl) = parms;
4794 /* Since there is a prototype, args are passed in their
4795 declared types. The back end may override this later. */
4796 DECL_ARG_TYPE (decl) = type;
4797 types = tree_cons (0, type, types);
4801 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4802 case UNION_TYPE: keyword = "union"; goto tag;
4803 case RECORD_TYPE: keyword = "struct"; goto tag;
4805 /* Types may not have tag-names, in which case the type
4806 appears in the bindings list with b->id NULL. */
4809 gcc_assert (I_TAG_BINDING (b->id) == b);
4810 I_TAG_BINDING (b->id) = b->shadowed;
4813 /* Warn about any struct, union or enum tags defined in a
4814 parameter list. The scope of such types is limited to
4815 the parameter list, which is rarely if ever desirable
4816 (it's impossible to call such a function with type-
4817 correct arguments). An anonymous union parm type is
4818 meaningful as a GNU extension, so don't warn for that. */
4819 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4822 /* The %s will be one of 'struct', 'union', or 'enum'. */
4823 warning ("%<%s %E%> declared inside parameter list",
4826 /* The %s will be one of 'struct', 'union', or 'enum'. */
4827 warning ("anonymous %s declared inside parameter list",
4830 if (!explained_incomplete_types)
4832 warning ("its scope is only this definition or declaration,"
4833 " which is probably not what you want");
4834 explained_incomplete_types = true;
4838 tags = tree_cons (b->id, decl, tags);
4843 /* CONST_DECLs appear here when we have an embedded enum,
4844 and TYPE_DECLs appear here when we have an embedded struct
4845 or union. No warnings for this - we already warned about the
4847 TREE_CHAIN (decl) = others;
4852 /* error_mark_node appears here when we have an undeclared
4853 variable. Just throw it away. */
4856 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4857 I_SYMBOL_BINDING (b->id) = b->shadowed;
4861 /* Other things that might be encountered. */
4869 b = free_binding_and_advance (b);
4872 arg_info->parms = parms;
4873 arg_info->tags = tags;
4874 arg_info->types = types;
4875 arg_info->others = others;
4879 /* Get the struct, enum or union (CODE says which) with tag NAME.
4880 Define the tag as a forward-reference if it is not defined. */
4883 xref_tag (enum tree_code code, tree name)
4885 /* If a cross reference is requested, look up the type
4886 already defined for this tag and return it. */
4888 tree ref = lookup_tag (code, name, 0);
4889 /* If this is the right type of tag, return what we found.
4890 (This reference will be shadowed by shadow_tag later if appropriate.)
4891 If this is the wrong type of tag, do not return it. If it was the
4892 wrong type in the same scope, we will have had an error
4893 message already; if in a different scope and declaring
4894 a name, pending_xref_error will give an error message; but if in a
4895 different scope and not declaring a name, this tag should
4896 shadow the previous declaration of a different type of tag, and
4897 this would not work properly if we return the reference found.
4898 (For example, with "struct foo" in an outer scope, "union foo;"
4899 must shadow that tag with a new one of union type.) */
4900 if (ref && TREE_CODE (ref) == code)
4903 /* If no such tag is yet defined, create a forward-reference node
4904 and record it as the "definition".
4905 When a real declaration of this type is found,
4906 the forward-reference will be altered into a real type. */
4908 ref = make_node (code);
4909 if (code == ENUMERAL_TYPE)
4911 /* Give the type a default layout like unsigned int
4912 to avoid crashing if it does not get defined. */
4913 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4914 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4915 TYPE_USER_ALIGN (ref) = 0;
4916 TYPE_UNSIGNED (ref) = 1;
4917 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4918 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4919 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4922 pushtag (name, ref);
4927 /* Make sure that the tag NAME is defined *in the current scope*
4928 at least as a forward reference.
4929 CODE says which kind of tag NAME ought to be. */
4932 start_struct (enum tree_code code, tree name)
4934 /* If there is already a tag defined at this scope
4935 (as a forward reference), just return it. */
4940 ref = lookup_tag (code, name, 1);
4941 if (ref && TREE_CODE (ref) == code)
4943 if (TYPE_SIZE (ref))
4945 if (code == UNION_TYPE)
4946 error ("redefinition of %<union %s%>", IDENTIFIER_POINTER (name));
4948 error ("redefinition of %<struct %s%>", IDENTIFIER_POINTER (name));
4950 else if (C_TYPE_BEING_DEFINED (ref))
4952 if (code == UNION_TYPE)
4953 error ("nested redefinition of %<union %s%>",
4954 IDENTIFIER_POINTER (name));
4956 error ("nested redefinition of %<struct %s%>",
4957 IDENTIFIER_POINTER (name));
4962 /* Otherwise create a forward-reference just so the tag is in scope. */
4964 ref = make_node (code);
4965 pushtag (name, ref);
4968 C_TYPE_BEING_DEFINED (ref) = 1;
4969 TYPE_PACKED (ref) = flag_pack_struct;
4973 /* Process the specs, declarator and width (NULL if omitted)
4974 of a structure component, returning a FIELD_DECL node.
4975 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4977 This is done during the parsing of the struct declaration.
4978 The FIELD_DECL nodes are chained together and the lot of them
4979 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4982 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
4987 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
4988 && width == NULL_TREE)
4990 /* This is an unnamed decl.
4992 If we have something of the form "union { list } ;" then this
4993 is the anonymous union extension. Similarly for struct.
4995 If this is something of the form "struct foo;", then
4996 If MS extensions are enabled, this is handled as an
4998 Otherwise this is a forward declaration of a structure tag.
5000 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5001 If MS extensions are enabled and foo names a structure, then
5002 again this is an anonymous struct.
5003 Otherwise this is an error.
5005 Oh what a horrid tangled web we weave. I wonder if MS consciously
5006 took this from Plan 9 or if it was an accident of implementation
5007 that took root before someone noticed the bug... */
5009 tree type = declspecs->type;
5010 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5011 || TREE_CODE (type) == UNION_TYPE);
5015 && (flag_ms_extensions || !declspecs->typedef_p))
5017 if (flag_ms_extensions)
5021 else if (TYPE_NAME (type) == NULL)
5028 pedwarn ("declaration does not declare anything");
5032 pedwarn ("ISO C doesn't support unnamed structs/unions");
5035 value = grokdeclarator (declarator, declspecs, FIELD, false,
5036 width ? &width : NULL);
5038 finish_decl (value, NULL_TREE, NULL_TREE);
5039 DECL_INITIAL (value) = width;
5044 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5045 the list such that this does not present a problem later. */
5048 detect_field_duplicates (tree fieldlist)
5053 /* First, see if there are more than "a few" fields.
5054 This is trivially true if there are zero or one fields. */
5057 x = TREE_CHAIN (fieldlist);
5063 } while (timeout > 0 && x);
5065 /* If there were "few" fields, avoid the overhead of allocating
5066 a hash table. Instead just do the nested traversal thing. */
5069 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5072 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5073 if (DECL_NAME (y) == DECL_NAME (x))
5075 error ("%Jduplicate member %qD", x, x);
5076 DECL_NAME (x) = NULL_TREE;
5082 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5085 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5086 if ((y = DECL_NAME (x)) != 0)
5088 slot = htab_find_slot (htab, y, INSERT);
5091 error ("%Jduplicate member %qD", x, x);
5092 DECL_NAME (x) = NULL_TREE;
5101 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5102 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5103 ATTRIBUTES are attributes to be applied to the structure. */
5106 finish_struct (tree t, tree fieldlist, tree attributes)
5109 bool toplevel = file_scope == current_scope;
5110 int saw_named_field;
5112 /* If this type was previously laid out as a forward reference,
5113 make sure we lay it out again. */
5117 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5121 for (x = fieldlist; x; x = TREE_CHAIN (x))
5122 if (DECL_NAME (x) != 0)
5126 pedwarn ("%s has no %s",
5127 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5128 fieldlist ? _("named members") : _("members"));
5131 /* Install struct as DECL_CONTEXT of each field decl.
5132 Also process specified field sizes, found in the DECL_INITIAL,
5133 storing 0 there after the type has been changed to precision equal
5134 to its width, rather than the precision of the specified standard
5135 type. (Correct layout requires the original type to have been preserved
5138 saw_named_field = 0;
5139 for (x = fieldlist; x; x = TREE_CHAIN (x))
5141 DECL_CONTEXT (x) = t;
5142 DECL_PACKED (x) |= TYPE_PACKED (t);
5144 /* If any field is const, the structure type is pseudo-const. */
5145 if (TREE_READONLY (x))
5146 C_TYPE_FIELDS_READONLY (t) = 1;
5149 /* A field that is pseudo-const makes the structure likewise. */
5150 tree t1 = TREE_TYPE (x);
5151 while (TREE_CODE (t1) == ARRAY_TYPE)
5152 t1 = TREE_TYPE (t1);
5153 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5154 && C_TYPE_FIELDS_READONLY (t1))
5155 C_TYPE_FIELDS_READONLY (t) = 1;
5158 /* Any field that is volatile means variables of this type must be
5159 treated in some ways as volatile. */
5160 if (TREE_THIS_VOLATILE (x))
5161 C_TYPE_FIELDS_VOLATILE (t) = 1;
5163 /* Any field of nominal variable size implies structure is too. */
5164 if (C_DECL_VARIABLE_SIZE (x))
5165 C_TYPE_VARIABLE_SIZE (t) = 1;
5167 if (DECL_INITIAL (x))
5169 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5170 DECL_SIZE (x) = bitsize_int (width);
5171 DECL_BIT_FIELD (x) = 1;
5172 SET_DECL_C_BIT_FIELD (x);
5175 /* Detect flexible array member in an invalid context. */
5176 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5177 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5178 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5179 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5181 if (TREE_CODE (t) == UNION_TYPE)
5183 error ("%Jflexible array member in union", x);
5184 TREE_TYPE (x) = error_mark_node;
5186 else if (TREE_CHAIN (x) != NULL_TREE)
5188 error ("%Jflexible array member not at end of struct", x);
5189 TREE_TYPE (x) = error_mark_node;
5191 else if (!saw_named_field)
5193 error ("%Jflexible array member in otherwise empty struct", x);
5194 TREE_TYPE (x) = error_mark_node;
5198 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5199 && flexible_array_type_p (TREE_TYPE (x)))
5200 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5203 saw_named_field = 1;
5206 detect_field_duplicates (fieldlist);
5208 /* Now we have the nearly final fieldlist. Record it,
5209 then lay out the structure or union (including the fields). */
5211 TYPE_FIELDS (t) = fieldlist;
5215 /* Give bit-fields their proper types. */
5217 tree *fieldlistp = &fieldlist;
5219 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5220 && TREE_TYPE (*fieldlistp) != error_mark_node)
5222 unsigned HOST_WIDE_INT width
5223 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5224 tree type = TREE_TYPE (*fieldlistp);
5225 if (width != TYPE_PRECISION (type))
5226 TREE_TYPE (*fieldlistp)
5227 = build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
5228 DECL_INITIAL (*fieldlistp) = 0;
5231 fieldlistp = &TREE_CHAIN (*fieldlistp);
5234 /* Now we have the truly final field list.
5235 Store it in this type and in the variants. */
5237 TYPE_FIELDS (t) = fieldlist;
5239 /* If there are lots of fields, sort so we can look through them fast.
5240 We arbitrarily consider 16 or more elts to be "a lot". */
5245 for (x = fieldlist; x; x = TREE_CHAIN (x))
5247 if (len > 15 || DECL_NAME (x) == NULL)
5255 struct lang_type *space;
5256 struct sorted_fields_type *space2;
5258 len += list_length (x);
5260 /* Use the same allocation policy here that make_node uses, to
5261 ensure that this lives as long as the rest of the struct decl.
5262 All decls in an inline function need to be saved. */
5264 space = GGC_CNEW (struct lang_type);
5265 space2 = GGC_NEWVAR (struct sorted_fields_type,
5266 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5270 field_array = &space2->elts[0];
5271 for (x = fieldlist; x; x = TREE_CHAIN (x))
5273 field_array[len++] = x;
5275 /* If there is anonymous struct or union, break out of the loop. */
5276 if (DECL_NAME (x) == NULL)
5279 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5282 TYPE_LANG_SPECIFIC (t) = space;
5283 TYPE_LANG_SPECIFIC (t)->s->len = len;
5284 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5285 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5290 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5292 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5293 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5294 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5295 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5298 /* If this was supposed to be a transparent union, but we can't
5299 make it one, warn and turn off the flag. */
5300 if (TREE_CODE (t) == UNION_TYPE
5301 && TYPE_TRANSPARENT_UNION (t)
5302 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5304 TYPE_TRANSPARENT_UNION (t) = 0;
5305 warning ("union cannot be made transparent");
5308 /* If this structure or union completes the type of any previous
5309 variable declaration, lay it out and output its rtl. */
5310 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5314 tree decl = TREE_VALUE (x);
5315 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5316 layout_array_type (TREE_TYPE (decl));
5317 if (TREE_CODE (decl) != TYPE_DECL)
5319 layout_decl (decl, 0);
5320 if (c_dialect_objc ())
5321 objc_check_decl (decl);
5322 rest_of_decl_compilation (decl, toplevel, 0);
5327 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5329 /* Finish debugging output for this type. */
5330 rest_of_type_compilation (t, toplevel);
5335 /* Lay out the type T, and its element type, and so on. */
5338 layout_array_type (tree t)
5340 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5341 layout_array_type (TREE_TYPE (t));
5345 /* Begin compiling the definition of an enumeration type.
5346 NAME is its name (or null if anonymous).
5347 Returns the type object, as yet incomplete.
5348 Also records info about it so that build_enumerator
5349 may be used to declare the individual values as they are read. */
5352 start_enum (tree name)
5356 /* If this is the real definition for a previous forward reference,
5357 fill in the contents in the same object that used to be the
5358 forward reference. */
5361 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5363 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5365 enumtype = make_node (ENUMERAL_TYPE);
5366 pushtag (name, enumtype);
5369 if (C_TYPE_BEING_DEFINED (enumtype))
5370 error ("nested redefinition of %<enum %s%>", IDENTIFIER_POINTER (name));
5372 C_TYPE_BEING_DEFINED (enumtype) = 1;
5374 if (TYPE_VALUES (enumtype) != 0)
5376 /* This enum is a named one that has been declared already. */
5377 error ("redeclaration of %<enum %s%>", IDENTIFIER_POINTER (name));
5379 /* Completely replace its old definition.
5380 The old enumerators remain defined, however. */
5381 TYPE_VALUES (enumtype) = 0;
5384 enum_next_value = integer_zero_node;
5387 if (flag_short_enums)
5388 TYPE_PACKED (enumtype) = 1;
5393 /* After processing and defining all the values of an enumeration type,
5394 install their decls in the enumeration type and finish it off.
5395 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5396 and ATTRIBUTES are the specified attributes.
5397 Returns ENUMTYPE. */
5400 finish_enum (tree enumtype, tree values, tree attributes)
5403 tree minnode = 0, maxnode = 0;
5404 int precision, unsign;
5405 bool toplevel = (file_scope == current_scope);
5406 struct lang_type *lt;
5408 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5410 /* Calculate the maximum value of any enumerator in this type. */
5412 if (values == error_mark_node)
5413 minnode = maxnode = integer_zero_node;
5416 minnode = maxnode = TREE_VALUE (values);
5417 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5419 tree value = TREE_VALUE (pair);
5420 if (tree_int_cst_lt (maxnode, value))
5422 if (tree_int_cst_lt (value, minnode))
5427 /* Construct the final type of this enumeration. It is the same
5428 as one of the integral types - the narrowest one that fits, except
5429 that normally we only go as narrow as int - and signed iff any of
5430 the values are negative. */
5431 unsign = (tree_int_cst_sgn (minnode) >= 0);
5432 precision = MAX (min_precision (minnode, unsign),
5433 min_precision (maxnode, unsign));
5435 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5437 tem = c_common_type_for_size (precision, unsign);
5440 warning ("enumeration values exceed range of largest integer");
5441 tem = long_long_integer_type_node;
5445 tem = unsign ? unsigned_type_node : integer_type_node;
5447 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5448 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5449 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5450 TYPE_SIZE (enumtype) = 0;
5452 /* If the precision of the type was specific with an attribute and it
5453 was too small, give an error. Otherwise, use it. */
5454 if (TYPE_PRECISION (enumtype))
5456 if (precision > TYPE_PRECISION (enumtype))
5457 error ("specified mode too small for enumeral values");
5460 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5462 layout_type (enumtype);
5464 if (values != error_mark_node)
5466 /* Change the type of the enumerators to be the enum type. We
5467 need to do this irrespective of the size of the enum, for
5468 proper type checking. Replace the DECL_INITIALs of the
5469 enumerators, and the value slots of the list, with copies
5470 that have the enum type; they cannot be modified in place
5471 because they may be shared (e.g. integer_zero_node) Finally,
5472 change the purpose slots to point to the names of the decls. */
5473 for (pair = values; pair; pair = TREE_CHAIN (pair))
5475 tree enu = TREE_PURPOSE (pair);
5476 tree ini = DECL_INITIAL (enu);
5478 TREE_TYPE (enu) = enumtype;
5480 /* The ISO C Standard mandates enumerators to have type int,
5481 even though the underlying type of an enum type is
5482 unspecified. Here we convert any enumerators that fit in
5483 an int to type int, to avoid promotions to unsigned types
5484 when comparing integers with enumerators that fit in the
5485 int range. When -pedantic is given, build_enumerator()
5486 would have already taken care of those that don't fit. */
5487 if (int_fits_type_p (ini, integer_type_node))
5488 tem = integer_type_node;
5491 ini = convert (tem, ini);
5493 DECL_INITIAL (enu) = ini;
5494 TREE_PURPOSE (pair) = DECL_NAME (enu);
5495 TREE_VALUE (pair) = ini;
5498 TYPE_VALUES (enumtype) = values;
5501 /* Record the min/max values so that we can warn about bit-field
5502 enumerations that are too small for the values. */
5503 lt = GGC_CNEW (struct lang_type);
5504 lt->enum_min = minnode;
5505 lt->enum_max = maxnode;
5506 TYPE_LANG_SPECIFIC (enumtype) = lt;
5508 /* Fix up all variant types of this enum type. */
5509 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5511 if (tem == enumtype)
5513 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5514 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5515 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5516 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5517 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5518 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5519 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5520 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5521 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5522 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5523 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5526 /* Finish debugging output for this type. */
5527 rest_of_type_compilation (enumtype, toplevel);
5532 /* Build and install a CONST_DECL for one value of the
5533 current enumeration type (one that was begun with start_enum).
5534 Return a tree-list containing the CONST_DECL and its value.
5535 Assignment of sequential values by default is handled here. */
5538 build_enumerator (tree name, tree value)
5542 /* Validate and default VALUE. */
5544 /* Remove no-op casts from the value. */
5546 STRIP_TYPE_NOPS (value);
5550 /* Don't issue more errors for error_mark_node (i.e. an
5551 undeclared identifier) - just ignore the value expression. */
5552 if (value == error_mark_node)
5554 else if (TREE_CODE (value) != INTEGER_CST)
5556 error ("enumerator value for %qE is not an integer constant", name);
5561 value = default_conversion (value);
5562 constant_expression_warning (value);
5566 /* Default based on previous value. */
5567 /* It should no longer be possible to have NON_LVALUE_EXPR
5571 value = enum_next_value;
5573 error ("overflow in enumeration values");
5576 if (pedantic && !int_fits_type_p (value, integer_type_node))
5578 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5579 /* XXX This causes -pedantic to change the meaning of the program.
5580 Remove? -zw 2004-03-15 */
5581 value = convert (integer_type_node, value);
5584 /* Set basis for default for next value. */
5585 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5586 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5588 /* Now create a declaration for the enum value name. */
5590 type = TREE_TYPE (value);
5591 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5592 TYPE_PRECISION (integer_type_node)),
5593 (TYPE_PRECISION (type)
5594 >= TYPE_PRECISION (integer_type_node)
5595 && TYPE_UNSIGNED (type)));
5597 decl = build_decl (CONST_DECL, name, type);
5598 DECL_INITIAL (decl) = convert (type, value);
5601 return tree_cons (decl, value, NULL_TREE);
5605 /* Create the FUNCTION_DECL for a function definition.
5606 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5607 the declaration; they describe the function's name and the type it returns,
5608 but twisted together in a fashion that parallels the syntax of C.
5610 This function creates a binding context for the function body
5611 as well as setting up the FUNCTION_DECL in current_function_decl.
5613 Returns 1 on success. If the DECLARATOR is not suitable for a function
5614 (it defines a datum instead), we return 0, which tells
5615 yyparse to report a parse error. */
5618 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5621 tree decl1, old_decl;
5622 tree restype, resdecl;
5624 current_function_returns_value = 0; /* Assume, until we see it does. */
5625 current_function_returns_null = 0;
5626 current_function_returns_abnormally = 0;
5627 warn_about_return_type = 0;
5628 current_extern_inline = 0;
5629 c_switch_stack = NULL;
5631 /* Indicate no valid break/continue context by setting these variables
5632 to some non-null, non-label value. We'll notice and emit the proper
5633 error message in c_finish_bc_stmt. */
5634 c_break_label = c_cont_label = size_zero_node;
5636 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5638 /* If the declarator is not suitable for a function definition,
5639 cause a syntax error. */
5643 decl_attributes (&decl1, attributes, 0);
5645 if (DECL_DECLARED_INLINE_P (decl1)
5646 && DECL_UNINLINABLE (decl1)
5647 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5648 warning ("%Jinline function %qD given attribute noinline", decl1, decl1);
5650 announce_function (decl1);
5652 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5654 error ("return type is an incomplete type");
5655 /* Make it return void instead. */
5657 = build_function_type (void_type_node,
5658 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5661 if (warn_about_return_type)
5662 pedwarn_c99 ("return type defaults to %<int%>");
5664 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5665 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5666 DECL_INITIAL (decl1) = error_mark_node;
5668 /* If this definition isn't a prototype and we had a prototype declaration
5669 before, copy the arg type info from that prototype.
5670 But not if what we had before was a builtin function. */
5671 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5672 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5673 && !DECL_BUILT_IN (old_decl)
5674 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5675 TREE_TYPE (TREE_TYPE (old_decl)))
5676 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5678 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5680 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5683 /* Optionally warn of old-fashioned def with no previous prototype. */
5684 if (warn_strict_prototypes
5685 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5686 && C_DECL_ISNT_PROTOTYPE (old_decl))
5687 warning ("function declaration isn%'t a prototype");
5688 /* Optionally warn of any global def with no previous prototype. */
5689 else if (warn_missing_prototypes
5690 && TREE_PUBLIC (decl1)
5691 && !MAIN_NAME_P (DECL_NAME (decl1))
5692 && C_DECL_ISNT_PROTOTYPE (old_decl))
5693 warning ("%Jno previous prototype for %qD", decl1, decl1);
5694 /* Optionally warn of any def with no previous prototype
5695 if the function has already been used. */
5696 else if (warn_missing_prototypes
5697 && old_decl != 0 && TREE_USED (old_decl)
5698 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5699 warning ("%J%qD was used with no prototype before its definition",
5701 /* Optionally warn of any global def with no previous declaration. */
5702 else if (warn_missing_declarations
5703 && TREE_PUBLIC (decl1)
5705 && !MAIN_NAME_P (DECL_NAME (decl1)))
5706 warning ("%Jno previous declaration for %qD", decl1, decl1);
5707 /* Optionally warn of any def with no previous declaration
5708 if the function has already been used. */
5709 else if (warn_missing_declarations
5710 && old_decl != 0 && TREE_USED (old_decl)
5711 && C_DECL_IMPLICIT (old_decl))
5712 warning ("%J%qD was used with no declaration before its definition",
5715 /* This is a definition, not a reference.
5716 So normally clear DECL_EXTERNAL.
5717 However, `extern inline' acts like a declaration
5718 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5719 DECL_EXTERNAL (decl1) = current_extern_inline;
5721 /* This function exists in static storage.
5722 (This does not mean `static' in the C sense!) */
5723 TREE_STATIC (decl1) = 1;
5725 /* A nested function is not global. */
5726 if (current_function_decl != 0)
5727 TREE_PUBLIC (decl1) = 0;
5729 /* This is the earliest point at which we might know the assembler
5730 name of the function. Thus, if it's set before this, die horribly. */
5731 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5733 /* If #pragma weak was used, mark the decl weak now. */
5734 if (current_scope == file_scope)
5735 maybe_apply_pragma_weak (decl1);
5737 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5738 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5743 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5744 != integer_type_node)
5745 pedwarn ("%Jreturn type of %qD is not %<int%>", decl1, decl1);
5747 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5748 args = TREE_CHAIN (args))
5750 tree type = args ? TREE_VALUE (args) : 0;
5752 if (type == void_type_node)
5759 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5760 pedwarn ("%Jfirst argument of %qD should be %<int%>",
5765 if (TREE_CODE (type) != POINTER_TYPE
5766 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5767 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5769 pedwarn ("%Jsecond argument of %qD should be %<char **%>",
5774 if (TREE_CODE (type) != POINTER_TYPE
5775 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5776 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5778 pedwarn ("%Jthird argument of %qD should probably be "
5779 "%<char **%>", decl1, decl1);
5784 /* It is intentional that this message does not mention the third
5785 argument because it's only mentioned in an appendix of the
5787 if (argct > 0 && (argct < 2 || argct > 3))
5788 pedwarn ("%J%qD takes only zero or two arguments", decl1, decl1);
5790 if (!TREE_PUBLIC (decl1))
5791 pedwarn ("%J%qD is normally a non-static function", decl1, decl1);
5794 /* Record the decl so that the function name is defined.
5795 If we already have a decl for this name, and it is a FUNCTION_DECL,
5796 use the old decl. */
5798 current_function_decl = pushdecl (decl1);
5801 declare_parm_level ();
5803 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5804 /* Promote the value to int before returning it. */
5805 if (c_promoting_integer_type_p (restype))
5807 /* It retains unsignedness if not really getting wider. */
5808 if (TYPE_UNSIGNED (restype)
5809 && (TYPE_PRECISION (restype)
5810 == TYPE_PRECISION (integer_type_node)))
5811 restype = unsigned_type_node;
5813 restype = integer_type_node;
5816 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
5817 DECL_ARTIFICIAL (resdecl) = 1;
5818 DECL_IGNORED_P (resdecl) = 1;
5819 DECL_RESULT (current_function_decl) = resdecl;
5821 start_fname_decls ();
5826 /* Subroutine of store_parm_decls which handles new-style function
5827 definitions (prototype format). The parms already have decls, so we
5828 need only record them as in effect and complain if any redundant
5829 old-style parm decls were written. */
5831 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
5835 if (current_scope->bindings)
5837 error ("%Jold-style parameter declarations in prototyped "
5838 "function definition", fndecl);
5840 /* Get rid of the old-style declarations. */
5844 /* Don't issue this warning for nested functions, and don't issue this
5845 warning if we got here because ARG_INFO_TYPES was error_mark_node
5846 (this happens when a function definition has just an ellipsis in
5847 its parameter list). */
5848 else if (warn_traditional && !in_system_header && !current_function_scope
5849 && arg_info->types != error_mark_node)
5850 warning ("%Jtraditional C rejects ISO C style function definitions",
5853 /* Now make all the parameter declarations visible in the function body.
5854 We can bypass most of the grunt work of pushdecl. */
5855 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
5857 DECL_CONTEXT (decl) = current_function_decl;
5858 if (DECL_NAME (decl))
5859 bind (DECL_NAME (decl), decl, current_scope,
5860 /*invisible=*/false, /*nested=*/false);
5862 error ("%Jparameter name omitted", decl);
5865 /* Record the parameter list in the function declaration. */
5866 DECL_ARGUMENTS (fndecl) = arg_info->parms;
5868 /* Now make all the ancillary declarations visible, likewise. */
5869 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
5871 DECL_CONTEXT (decl) = current_function_decl;
5872 if (DECL_NAME (decl))
5873 bind (DECL_NAME (decl), decl, current_scope,
5874 /*invisible=*/false, /*nested=*/false);
5877 /* And all the tag declarations. */
5878 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
5879 if (TREE_PURPOSE (decl))
5880 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
5881 /*invisible=*/false, /*nested=*/false);
5884 /* Subroutine of store_parm_decls which handles old-style function
5885 definitions (separate parameter list and declarations). */
5888 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
5890 struct c_binding *b;
5891 tree parm, decl, last;
5892 tree parmids = arg_info->parms;
5894 /* We use DECL_WEAK as a flag to show which parameters have been
5895 seen already, since it is not used on PARM_DECL. */
5896 #ifdef ENABLE_CHECKING
5897 for (b = current_scope->bindings; b; b = b->prev)
5898 gcc_assert (TREE_CODE (b->decl) != PARM_DECL || !DECL_WEAK (b->decl));
5901 if (warn_old_style_definition && !in_system_header)
5902 warning ("%Jold-style function definition", fndecl);
5904 /* Match each formal parameter name with its declaration. Save each
5905 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5906 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5908 if (TREE_VALUE (parm) == 0)
5910 error ("%Jparameter name missing from parameter list", fndecl);
5911 TREE_PURPOSE (parm) = 0;
5915 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
5916 if (b && B_IN_CURRENT_SCOPE (b))
5919 /* If we got something other than a PARM_DECL it is an error. */
5920 if (TREE_CODE (decl) != PARM_DECL)
5921 error ("%J%qD declared as a non-parameter", decl, decl);
5922 /* If the declaration is already marked, we have a duplicate
5923 name. Complain and ignore the duplicate. */
5924 else if (DECL_WEAK (decl))
5926 error ("%Jmultiple parameters named %qD", decl, decl);
5927 TREE_PURPOSE (parm) = 0;
5930 /* If the declaration says "void", complain and turn it into
5932 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5934 error ("%Jparameter %qD declared with void type", decl, decl);
5935 TREE_TYPE (decl) = integer_type_node;
5936 DECL_ARG_TYPE (decl) = integer_type_node;
5937 layout_decl (decl, 0);
5940 /* If no declaration found, default to int. */
5943 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5944 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5945 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5949 pedwarn ("%Jtype of %qD defaults to %<int%>", decl, decl);
5950 else if (extra_warnings)
5951 warning ("%Jtype of %qD defaults to %<int%>", decl, decl);
5954 TREE_PURPOSE (parm) = decl;
5955 DECL_WEAK (decl) = 1;
5958 /* Now examine the parms chain for incomplete declarations
5959 and declarations with no corresponding names. */
5961 for (b = current_scope->bindings; b; b = b->prev)
5964 if (TREE_CODE (parm) != PARM_DECL)
5967 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5969 error ("%Jparameter %qD has incomplete type", parm, parm);
5970 TREE_TYPE (parm) = error_mark_node;
5973 if (!DECL_WEAK (parm))
5975 error ("%Jdeclaration for parameter %qD but no such parameter",
5978 /* Pretend the parameter was not missing.
5979 This gets us to a standard state and minimizes
5980 further error messages. */
5981 parmids = chainon (parmids, tree_cons (parm, 0, 0));
5985 /* Chain the declarations together in the order of the list of
5986 names. Store that chain in the function decl, replacing the
5987 list of names. Update the current scope to match. */
5988 DECL_ARGUMENTS (fndecl) = 0;
5990 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5991 if (TREE_PURPOSE (parm))
5993 if (parm && TREE_PURPOSE (parm))
5995 last = TREE_PURPOSE (parm);
5996 DECL_ARGUMENTS (fndecl) = last;
5997 DECL_WEAK (last) = 0;
5999 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6000 if (TREE_PURPOSE (parm))
6002 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6003 last = TREE_PURPOSE (parm);
6004 DECL_WEAK (last) = 0;
6006 TREE_CHAIN (last) = 0;
6009 /* If there was a previous prototype,
6010 set the DECL_ARG_TYPE of each argument according to
6011 the type previously specified, and report any mismatches. */
6013 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6016 for (parm = DECL_ARGUMENTS (fndecl),
6017 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6018 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6019 != void_type_node));
6020 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6022 if (parm == 0 || type == 0
6023 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6025 error ("number of arguments doesn%'t match prototype");
6026 error ("%Hprototype declaration",
6027 ¤t_function_prototype_locus);
6030 /* Type for passing arg must be consistent with that
6031 declared for the arg. ISO C says we take the unqualified
6032 type for parameters declared with qualified type. */
6033 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6034 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6036 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6037 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6039 /* Adjust argument to match prototype. E.g. a previous
6040 `int foo(float);' prototype causes
6041 `int foo(x) float x; {...}' to be treated like
6042 `int foo(float x) {...}'. This is particularly
6043 useful for argument types like uid_t. */
6044 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6046 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6047 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6048 && TYPE_PRECISION (TREE_TYPE (parm))
6049 < TYPE_PRECISION (integer_type_node))
6050 DECL_ARG_TYPE (parm) = integer_type_node;
6054 pedwarn ("promoted argument %qD "
6055 "doesn%'t match prototype", parm);
6056 pedwarn ("%Hprototype declaration",
6057 ¤t_function_prototype_locus);
6062 error ("argument %qD doesn%'t match prototype", parm);
6063 error ("%Hprototype declaration",
6064 ¤t_function_prototype_locus);
6068 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6071 /* Otherwise, create a prototype that would match. */
6075 tree actual = 0, last = 0, type;
6077 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6079 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6081 TREE_CHAIN (last) = type;
6086 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6088 TREE_CHAIN (last) = type;
6092 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6093 of the type of this function, but we need to avoid having this
6094 affect the types of other similarly-typed functions, so we must
6095 first force the generation of an identical (but separate) type
6096 node for the relevant function type. The new node we create
6097 will be a variant of the main variant of the original function
6100 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6102 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6106 /* Store parameter declarations passed in ARG_INFO into the current
6107 function declaration. */
6110 store_parm_decls_from (struct c_arg_info *arg_info)
6112 current_function_arg_info = arg_info;
6113 store_parm_decls ();
6116 /* Store the parameter declarations into the current function declaration.
6117 This is called after parsing the parameter declarations, before
6118 digesting the body of the function.
6120 For an old-style definition, construct a prototype out of the old-style
6121 parameter declarations and inject it into the function's type. */
6124 store_parm_decls (void)
6126 tree fndecl = current_function_decl;
6129 /* The argument information block for FNDECL. */
6130 struct c_arg_info *arg_info = current_function_arg_info;
6131 current_function_arg_info = 0;
6133 /* True if this definition is written with a prototype. Note:
6134 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6135 list in a function definition as equivalent to (void) -- an
6136 empty argument list specifies the function has no parameters,
6137 but only (void) sets up a prototype for future calls. */
6138 proto = arg_info->types != 0;
6141 store_parm_decls_newstyle (fndecl, arg_info);
6143 store_parm_decls_oldstyle (fndecl, arg_info);
6145 /* The next call to push_scope will be a function body. */
6147 next_is_function_body = true;
6149 /* Write a record describing this function definition to the prototypes
6150 file (if requested). */
6152 gen_aux_info_record (fndecl, 1, 0, proto);
6154 /* Initialize the RTL code for the function. */
6155 allocate_struct_function (fndecl);
6157 /* Begin the statement tree for this function. */
6158 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6160 /* ??? Insert the contents of the pending sizes list into the function
6161 to be evaluated. This just changes mis-behavior until assign_parms
6162 phase ordering problems are resolved. */
6165 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6166 add_stmt (TREE_VALUE (t));
6169 /* Even though we're inside a function body, we still don't want to
6170 call expand_expr to calculate the size of a variable-sized array.
6171 We haven't necessarily assigned RTL to all variables yet, so it's
6172 not safe to try to expand expressions involving them. */
6173 cfun->x_dont_save_pending_sizes_p = 1;
6176 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6180 c_warn_unused_result_recursively (tree fndecl)
6182 struct cgraph_node *cgn;
6184 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6185 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6187 /* Finalize all nested functions now. */
6188 cgn = cgraph_node (fndecl);
6189 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6190 c_warn_unused_result_recursively (cgn->decl);
6193 /* Finish up a function declaration and compile that function
6194 all the way to assembler language output. The free the storage
6195 for the function definition.
6197 This is called after parsing the body of the function definition. */
6200 finish_function (void)
6202 tree fndecl = current_function_decl;
6204 if (TREE_CODE (fndecl) == FUNCTION_DECL
6205 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6207 tree args = DECL_ARGUMENTS (fndecl);
6208 for (; args; args = TREE_CHAIN (args))
6210 tree type = TREE_TYPE (args);
6211 if (INTEGRAL_TYPE_P (type)
6212 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6213 DECL_ARG_TYPE (args) = integer_type_node;
6217 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6218 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6220 /* Must mark the RESULT_DECL as being in this function. */
6222 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6223 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6225 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6227 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6228 != integer_type_node)
6230 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6231 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6233 pedwarn ("%Jreturn type of %qD is not %<int%>", fndecl, fndecl);
6238 c_finish_return (integer_zero_node);
6242 /* Tie off the statement tree for this function. */
6243 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6245 finish_fname_decls ();
6247 /* Complain if there's just no return statement. */
6248 if (warn_return_type
6249 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6250 && !current_function_returns_value && !current_function_returns_null
6251 /* Don't complain if we abort. */
6252 && !current_function_returns_abnormally
6253 /* Don't warn for main(). */
6254 && !MAIN_NAME_P (DECL_NAME (fndecl))
6255 /* Or if they didn't actually specify a return type. */
6256 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6257 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6258 inline function, as we might never be compiled separately. */
6259 && DECL_INLINE (fndecl))
6260 warning ("no return statement in function returning non-void");
6262 /* With just -Wextra, complain only if function returns both with
6263 and without a value. */
6265 && current_function_returns_value
6266 && current_function_returns_null)
6267 warning ("this function may return with or without a value");
6269 /* Store the end of the function, so that we get good line number
6270 info for the epilogue. */
6271 cfun->function_end_locus = input_location;
6273 /* If we don't have ctors/dtors sections, and this is a static
6274 constructor or destructor, it must be recorded now. */
6275 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6276 && !targetm.have_ctors_dtors)
6277 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6278 if (DECL_STATIC_DESTRUCTOR (fndecl)
6279 && !targetm.have_ctors_dtors)
6280 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6282 /* Finalize the ELF visibility for the function. */
6283 c_determine_visibility (fndecl);
6285 /* Genericize before inlining. Delay genericizing nested functions
6286 until their parent function is genericized. Since finalizing
6287 requires GENERIC, delay that as well. */
6289 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6291 if (!decl_function_context (fndecl))
6293 c_genericize (fndecl);
6294 c_warn_unused_result_recursively (fndecl);
6296 /* ??? Objc emits functions after finalizing the compilation unit.
6297 This should be cleaned up later and this conditional removed. */
6298 if (cgraph_global_info_ready)
6300 c_expand_body (fndecl);
6304 cgraph_finalize_function (fndecl, false);
6308 /* Register this function with cgraph just far enough to get it
6309 added to our parent's nested function list. Handy, since the
6310 C front end doesn't have such a list. */
6311 (void) cgraph_node (fndecl);
6315 /* We're leaving the context of this function, so zap cfun.
6316 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6317 tree_rest_of_compilation. */
6319 current_function_decl = NULL;
6322 /* Generate the RTL for the body of FNDECL. */
6325 c_expand_body (tree fndecl)
6328 if (!DECL_INITIAL (fndecl)
6329 || DECL_INITIAL (fndecl) == error_mark_node)
6332 tree_rest_of_compilation (fndecl);
6334 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6335 && targetm.have_ctors_dtors)
6336 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6337 DEFAULT_INIT_PRIORITY);
6338 if (DECL_STATIC_DESTRUCTOR (fndecl)
6339 && targetm.have_ctors_dtors)
6340 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6341 DEFAULT_INIT_PRIORITY);
6344 /* Check the declarations given in a for-loop for satisfying the C99
6347 check_for_loop_decls (void)
6349 struct c_binding *b;
6353 /* If we get here, declarations have been used in a for loop without
6354 the C99 for loop scope. This doesn't make much sense, so don't
6356 error ("%<for%> loop initial declaration used outside C99 mode");
6359 /* C99 subclause 6.8.5 paragraph 3:
6361 [#3] The declaration part of a for statement shall only
6362 declare identifiers for objects having storage class auto or
6365 It isn't clear whether, in this sentence, "identifiers" binds to
6366 "shall only declare" or to "objects" - that is, whether all identifiers
6367 declared must be identifiers for objects, or whether the restriction
6368 only applies to those that are. (A question on this in comp.std.c
6369 in November 2000 received no answer.) We implement the strictest
6370 interpretation, to avoid creating an extension which later causes
6373 for (b = current_scope->bindings; b; b = b->prev)
6376 tree decl = b->decl;
6381 switch (TREE_CODE (decl))
6384 if (TREE_STATIC (decl))
6385 error ("%Jdeclaration of static variable %qD in %<for%> loop "
6386 "initial declaration", decl, decl);
6387 else if (DECL_EXTERNAL (decl))
6388 error ("%Jdeclaration of %<extern%> variable %qD in %<for%> loop "
6389 "initial declaration", decl, decl);
6393 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6397 error ("%<union %E%> declared in %<for%> loop initial declaration",
6401 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6405 error ("%Jdeclaration of non-variable %qD in %<for%> loop "
6406 "initial declaration", decl, decl);
6411 /* Save and reinitialize the variables
6412 used during compilation of a C function. */
6415 c_push_function_context (struct function *f)
6417 struct language_function *p;
6418 p = GGC_NEW (struct language_function);
6421 p->base.x_stmt_tree = c_stmt_tree;
6422 p->x_break_label = c_break_label;
6423 p->x_cont_label = c_cont_label;
6424 p->x_switch_stack = c_switch_stack;
6425 p->arg_info = current_function_arg_info;
6426 p->returns_value = current_function_returns_value;
6427 p->returns_null = current_function_returns_null;
6428 p->returns_abnormally = current_function_returns_abnormally;
6429 p->warn_about_return_type = warn_about_return_type;
6430 p->extern_inline = current_extern_inline;
6433 /* Restore the variables used during compilation of a C function. */
6436 c_pop_function_context (struct function *f)
6438 struct language_function *p = f->language;
6440 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6441 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6443 /* Stop pointing to the local nodes about to be freed. */
6444 /* But DECL_INITIAL must remain nonzero so we know this
6445 was an actual function definition. */
6446 DECL_INITIAL (current_function_decl) = error_mark_node;
6447 DECL_ARGUMENTS (current_function_decl) = 0;
6450 c_stmt_tree = p->base.x_stmt_tree;
6451 c_break_label = p->x_break_label;
6452 c_cont_label = p->x_cont_label;
6453 c_switch_stack = p->x_switch_stack;
6454 current_function_arg_info = p->arg_info;
6455 current_function_returns_value = p->returns_value;
6456 current_function_returns_null = p->returns_null;
6457 current_function_returns_abnormally = p->returns_abnormally;
6458 warn_about_return_type = p->warn_about_return_type;
6459 current_extern_inline = p->extern_inline;
6464 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6467 c_dup_lang_specific_decl (tree decl)
6469 struct lang_decl *ld;
6471 if (!DECL_LANG_SPECIFIC (decl))
6474 ld = GGC_NEW (struct lang_decl);
6475 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6476 DECL_LANG_SPECIFIC (decl) = ld;
6479 /* The functions below are required for functionality of doing
6480 function at once processing in the C front end. Currently these
6481 functions are not called from anywhere in the C front end, but as
6482 these changes continue, that will change. */
6484 /* Returns nonzero if the current statement is a full expression,
6485 i.e. temporaries created during that statement should be destroyed
6486 at the end of the statement. */
6489 stmts_are_full_exprs_p (void)
6494 /* Returns the stmt_tree (if any) to which statements are currently
6495 being added. If there is no active statement-tree, NULL is
6499 current_stmt_tree (void)
6501 return &c_stmt_tree;
6504 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6508 anon_aggr_type_p (tree ARG_UNUSED (node))
6513 /* Return the global value of T as a symbol. */
6516 identifier_global_value (tree t)
6518 struct c_binding *b;
6520 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6521 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6527 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6528 otherwise the name is found in ridpointers from RID_INDEX. */
6531 record_builtin_type (enum rid rid_index, const char *name, tree type)
6535 id = ridpointers[(int) rid_index];
6537 id = get_identifier (name);
6538 decl = build_decl (TYPE_DECL, id, type);
6540 if (debug_hooks->type_decl)
6541 debug_hooks->type_decl (decl, false);
6544 /* Build the void_list_node (void_type_node having been created). */
6546 build_void_list_node (void)
6548 tree t = build_tree_list (NULL_TREE, void_type_node);
6552 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6555 build_c_parm (struct c_declspecs *specs, tree attrs,
6556 struct c_declarator *declarator)
6558 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6561 ret->declarator = declarator;
6565 /* Return a declarator with nested attributes. TARGET is the inner
6566 declarator to which these attributes apply. ATTRS are the
6569 struct c_declarator *
6570 build_attrs_declarator (tree attrs, struct c_declarator *target)
6572 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6573 ret->kind = cdk_attrs;
6574 ret->declarator = target;
6575 ret->u.attrs = attrs;
6579 /* Return a declarator for a function with arguments specified by ARGS
6580 and return type specified by TARGET. */
6582 struct c_declarator *
6583 build_function_declarator (struct c_arg_info *args,
6584 struct c_declarator *target)
6586 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6587 ret->kind = cdk_function;
6588 ret->declarator = target;
6589 ret->u.arg_info = args;
6593 /* Return a declarator for the identifier IDENT (which may be
6594 NULL_TREE for an abstract declarator). */
6596 struct c_declarator *
6597 build_id_declarator (tree ident)
6599 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6601 ret->declarator = 0;
6606 /* Return something to represent absolute declarators containing a *.
6607 TARGET is the absolute declarator that the * contains.
6608 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6609 to apply to the pointer type. */
6611 struct c_declarator *
6612 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6613 struct c_declarator *target)
6617 struct c_declarator *itarget = target;
6618 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6619 if (type_quals_attrs)
6621 attrs = type_quals_attrs->attrs;
6622 quals = quals_from_declspecs (type_quals_attrs);
6623 if (attrs != NULL_TREE)
6624 itarget = build_attrs_declarator (attrs, target);
6626 ret->kind = cdk_pointer;
6627 ret->declarator = itarget;
6628 ret->u.pointer_quals = quals;
6632 /* Return a pointer to a structure for an empty list of declaration
6635 struct c_declspecs *
6636 build_null_declspecs (void)
6638 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6642 ret->typespec_word = cts_none;
6643 ret->storage_class = csc_none;
6644 ret->non_sc_seen_p = false;
6645 ret->typedef_p = false;
6646 ret->explicit_signed_p = false;
6647 ret->deprecated_p = false;
6648 ret->default_int_p = false;
6649 ret->long_p = false;
6650 ret->long_long_p = false;
6651 ret->short_p = false;
6652 ret->signed_p = false;
6653 ret->unsigned_p = false;
6654 ret->complex_p = false;
6655 ret->inline_p = false;
6656 ret->thread_p = false;
6657 ret->const_p = false;
6658 ret->volatile_p = false;
6659 ret->restrict_p = false;
6663 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6666 struct c_declspecs *
6667 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6671 specs->non_sc_seen_p = true;
6672 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6673 && C_IS_RESERVED_WORD (qual));
6674 i = C_RID_CODE (qual);
6678 dupe = specs->const_p;
6679 specs->const_p = true;
6682 dupe = specs->volatile_p;
6683 specs->volatile_p = true;
6686 dupe = specs->restrict_p;
6687 specs->restrict_p = true;
6692 if (dupe && pedantic && !flag_isoc99)
6693 pedwarn ("duplicate %qs", IDENTIFIER_POINTER (qual));
6697 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6700 struct c_declspecs *
6701 declspecs_add_type (struct c_declspecs *specs, tree type)
6703 specs->non_sc_seen_p = true;
6704 if (TREE_DEPRECATED (type))
6705 specs->deprecated_p = true;
6707 /* Handle type specifier keywords. */
6708 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
6710 enum rid i = C_RID_CODE (type);
6713 error ("two or more data types in declaration specifiers");
6716 if ((int) i <= (int) RID_LAST_MODIFIER)
6718 /* "long", "short", "signed", "unsigned" or "_Complex". */
6723 if (specs->long_long_p)
6725 error ("%<long long long%> is too long for GCC");
6730 if (specs->typespec_word == cts_double)
6732 error ("both %<long long%> and %<double%> in "
6733 "declaration specifiers");
6736 if (pedantic && !flag_isoc99 && !in_system_header
6738 pedwarn ("ISO C90 does not support %<long long%>");
6739 specs->long_long_p = 1;
6743 error ("both %<long%> and %<short%> in "
6744 "declaration specifiers");
6745 else if (specs->typespec_word == cts_void)
6746 error ("both %<long%> and %<void%> in "
6747 "declaration specifiers");
6748 else if (specs->typespec_word == cts_bool)
6749 error ("both %<long%> and %<_Bool%> in "
6750 "declaration specifiers");
6751 else if (specs->typespec_word == cts_char)
6752 error ("both %<long%> and %<char%> in "
6753 "declaration specifiers");
6754 else if (specs->typespec_word == cts_float)
6755 error ("both %<long%> and %<float%> in "
6756 "declaration specifiers");
6758 specs->long_p = true;
6761 dupe = specs->short_p;
6763 error ("both %<long%> and %<short%> in "
6764 "declaration specifiers");
6765 else if (specs->typespec_word == cts_void)
6766 error ("both %<short%> and %<void%> in "
6767 "declaration specifiers");
6768 else if (specs->typespec_word == cts_bool)
6769 error ("both %<short%> and %<_Bool%> in "
6770 "declaration specifiers");
6771 else if (specs->typespec_word == cts_char)
6772 error ("both %<short%> and %<char%> in "
6773 "declaration specifiers");
6774 else if (specs->typespec_word == cts_float)
6775 error ("both %<short%> and %<float%> in "
6776 "declaration specifiers");
6777 else if (specs->typespec_word == cts_double)
6778 error ("both %<short%> and %<double%> in "
6779 "declaration specifiers");
6781 specs->short_p = true;
6784 dupe = specs->signed_p;
6785 if (specs->unsigned_p)
6786 error ("both %<signed%> and %<unsigned%> in "
6787 "declaration specifiers");
6788 else if (specs->typespec_word == cts_void)
6789 error ("both %<signed%> and %<void%> in "
6790 "declaration specifiers");
6791 else if (specs->typespec_word == cts_bool)
6792 error ("both %<signed%> and %<_Bool%> in "
6793 "declaration specifiers");
6794 else if (specs->typespec_word == cts_float)
6795 error ("both %<signed%> and %<float%> in "
6796 "declaration specifiers");
6797 else if (specs->typespec_word == cts_double)
6798 error ("both %<signed%> and %<double%> in "
6799 "declaration specifiers");
6801 specs->signed_p = true;
6804 dupe = specs->unsigned_p;
6805 if (specs->signed_p)
6806 error ("both %<signed%> and %<unsigned%> in "
6807 "declaration specifiers");
6808 else if (specs->typespec_word == cts_void)
6809 error ("both %<unsigned%> and %<void%> in "
6810 "declaration specifiers");
6811 else if (specs->typespec_word == cts_bool)
6812 error ("both %<unsigned%> and %<_Bool%> in "
6813 "declaration specifiers");
6814 else if (specs->typespec_word == cts_float)
6815 error ("both %<unsigned%> and %<float%> in "
6816 "declaration specifiers");
6817 else if (specs->typespec_word == cts_double)
6818 error ("both %<unsigned%> and %<double%> in "
6819 "declaration specifiers");
6821 specs->unsigned_p = true;
6824 dupe = specs->complex_p;
6825 if (pedantic && !flag_isoc99 && !in_system_header)
6826 pedwarn ("ISO C90 does not support complex types");
6827 if (specs->typespec_word == cts_void)
6828 error ("both %<complex%> and %<void%> in "
6829 "declaration specifiers");
6830 else if (specs->typespec_word == cts_bool)
6831 error ("both %<complex%> and %<_Bool%> in "
6832 "declaration specifiers");
6834 specs->complex_p = true;
6841 error ("duplicate %qs", IDENTIFIER_POINTER (type));
6847 /* "void", "_Bool", "char", "int", "float" or "double". */
6848 if (specs->typespec_word != cts_none)
6850 error ("two or more data types in declaration specifiers");
6857 error ("both %<long%> and %<void%> in "
6858 "declaration specifiers");
6859 else if (specs->short_p)
6860 error ("both %<short%> and %<void%> in "
6861 "declaration specifiers");
6862 else if (specs->signed_p)
6863 error ("both %<signed%> and %<void%> in "
6864 "declaration specifiers");
6865 else if (specs->unsigned_p)
6866 error ("both %<unsigned%> and %<void%> in "
6867 "declaration specifiers");
6868 else if (specs->complex_p)
6869 error ("both %<complex%> and %<void%> in "
6870 "declaration specifiers");
6872 specs->typespec_word = cts_void;
6876 error ("both %<long%> and %<_Bool%> in "
6877 "declaration specifiers");
6878 else if (specs->short_p)
6879 error ("both %<short%> and %<_Bool%> in "
6880 "declaration specifiers");
6881 else if (specs->signed_p)
6882 error ("both %<signed%> and %<_Bool%> in "
6883 "declaration specifiers");
6884 else if (specs->unsigned_p)
6885 error ("both %<unsigned%> and %<_Bool%> in "
6886 "declaration specifiers");
6887 else if (specs->complex_p)
6888 error ("both %<complex%> and %<_Bool%> in "
6889 "declaration specifiers");
6891 specs->typespec_word = cts_bool;
6895 error ("both %<long%> and %<char%> in "
6896 "declaration specifiers");
6897 else if (specs->short_p)
6898 error ("both %<short%> and %<char%> in "
6899 "declaration specifiers");
6901 specs->typespec_word = cts_char;
6904 specs->typespec_word = cts_int;
6908 error ("both %<long%> and %<float%> in "
6909 "declaration specifiers");
6910 else if (specs->short_p)
6911 error ("both %<short%> and %<float%> in "
6912 "declaration specifiers");
6913 else if (specs->signed_p)
6914 error ("both %<signed%> and %<float%> in "
6915 "declaration specifiers");
6916 else if (specs->unsigned_p)
6917 error ("both %<unsigned%> and %<float%> in "
6918 "declaration specifiers");
6920 specs->typespec_word = cts_float;
6923 if (specs->long_long_p)
6924 error ("both %<long long%> and %<double%> in "
6925 "declaration specifiers");
6926 else if (specs->short_p)
6927 error ("both %<short%> and %<double%> in "
6928 "declaration specifiers");
6929 else if (specs->signed_p)
6930 error ("both %<signed%> and %<double%> in "
6931 "declaration specifiers");
6932 else if (specs->unsigned_p)
6933 error ("both %<unsigned%> and %<double%> in "
6934 "declaration specifiers");
6936 specs->typespec_word = cts_double;
6939 /* ObjC reserved word "id", handled below. */
6945 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
6946 form of ObjC type, cases such as "int" and "long" being handled
6947 above), a TYPE (struct, union, enum and typeof specifiers) or an
6948 ERROR_MARK. In none of these cases may there have previously
6949 been any type specifiers. */
6950 if (specs->type || specs->typespec_word != cts_none
6951 || specs->long_p || specs->short_p || specs->signed_p
6952 || specs->unsigned_p || specs->complex_p)
6953 error ("two or more data types in declaration specifiers");
6954 else if (TREE_CODE (type) == TYPE_DECL)
6956 if (TREE_TYPE (type) == error_mark_node)
6957 ; /* Allow the type to default to int to avoid cascading errors. */
6960 specs->type = TREE_TYPE (type);
6961 specs->decl_attr = DECL_ATTRIBUTES (type);
6962 specs->typedef_p = true;
6963 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
6966 else if (TREE_CODE (type) == IDENTIFIER_NODE)
6968 tree t = lookup_name (type);
6969 if (!t || TREE_CODE (t) != TYPE_DECL)
6970 error ("%qs fails to be a typedef or built in type",
6971 IDENTIFIER_POINTER (type));
6972 else if (TREE_TYPE (t) == error_mark_node)
6975 specs->type = TREE_TYPE (t);
6977 else if (TREE_CODE (type) != ERROR_MARK)
6983 /* Add the storage class specifier or function specifier SCSPEC to the
6984 declaration specifiers SPECS, returning SPECS. */
6986 struct c_declspecs *
6987 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
6990 enum c_storage_class n = csc_none;
6992 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
6993 && C_IS_RESERVED_WORD (scspec));
6994 i = C_RID_CODE (scspec);
6995 if (extra_warnings && specs->non_sc_seen_p)
6996 warning ("%qs is not at beginning of declaration",
6997 IDENTIFIER_POINTER (scspec));
7001 /* C99 permits duplicate inline. Although of doubtful utility,
7002 it seems simplest to permit it in gnu89 mode as well, as
7003 there is also little utility in maintaining this as a
7004 difference between gnu89 and C99 inline. */
7006 specs->inline_p = true;
7009 dupe = specs->thread_p;
7010 if (specs->storage_class == csc_auto)
7011 error ("%<__thread%> used with %<auto%>");
7012 else if (specs->storage_class == csc_register)
7013 error ("%<__thread%> used with %<register%>");
7014 else if (specs->storage_class == csc_typedef)
7015 error ("%<__thread%> used with %<typedef%>");
7017 specs->thread_p = true;
7024 /* Diagnose "__thread extern". */
7025 if (specs->thread_p)
7026 error ("%<__thread%> before %<extern%>");
7033 /* Diagnose "__thread static". */
7034 if (specs->thread_p)
7035 error ("%<__thread%> before %<static%>");
7043 if (n != csc_none && n == specs->storage_class)
7046 error ("duplicate %qs", IDENTIFIER_POINTER (scspec));
7049 if (specs->storage_class != csc_none && n != specs->storage_class)
7051 error ("multiple storage classes in declaration specifiers");
7055 specs->storage_class = n;
7056 if (n != csc_extern && n != csc_static && specs->thread_p)
7058 error ("%<__thread%> used with %qs",
7059 IDENTIFIER_POINTER (scspec));
7060 specs->thread_p = false;
7067 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7070 struct c_declspecs *
7071 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7073 specs->attrs = chainon (attrs, specs->attrs);
7077 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7078 specifiers with any other type specifier to determine the resulting
7079 type. This is where ISO C checks on complex types are made, since
7080 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7083 struct c_declspecs *
7084 finish_declspecs (struct c_declspecs *specs)
7086 /* If a type was specified as a whole, we have no modifiers and are
7088 if (specs->type != NULL_TREE)
7090 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7091 && !specs->signed_p && !specs->unsigned_p
7092 && !specs->complex_p);
7096 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7097 has been specified, treat it as "int" unless "_Complex" is
7098 present and there are no other specifiers. If we just have
7099 "_Complex", it is equivalent to "_Complex double", but e.g.
7100 "_Complex short" is equivalent to "_Complex short int". */
7101 if (specs->typespec_word == cts_none)
7103 if (specs->long_p || specs->short_p
7104 || specs->signed_p || specs->unsigned_p)
7106 specs->typespec_word = cts_int;
7108 else if (specs->complex_p)
7110 specs->typespec_word = cts_double;
7112 pedwarn ("ISO C does not support plain %<complex%> meaning "
7113 "%<double complex%>");
7117 specs->typespec_word = cts_int;
7118 specs->default_int_p = true;
7119 /* We don't diagnose this here because grokdeclarator will
7120 give more specific diagnostics according to whether it is
7121 a function definition. */
7125 /* If "signed" was specified, record this to distinguish "int" and
7126 "signed int" in the case of a bit-field with
7127 -funsigned-bitfields. */
7128 specs->explicit_signed_p = specs->signed_p;
7130 /* Now compute the actual type. */
7131 switch (specs->typespec_word)
7134 gcc_assert (!specs->long_p && !specs->short_p
7135 && !specs->signed_p && !specs->unsigned_p
7136 && !specs->complex_p);
7137 specs->type = void_type_node;
7140 gcc_assert (!specs->long_p && !specs->short_p
7141 && !specs->signed_p && !specs->unsigned_p
7142 && !specs->complex_p);
7143 specs->type = boolean_type_node;
7146 gcc_assert (!specs->long_p && !specs->short_p);
7147 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7148 if (specs->signed_p)
7149 specs->type = signed_char_type_node;
7150 else if (specs->unsigned_p)
7151 specs->type = unsigned_char_type_node;
7153 specs->type = char_type_node;
7154 if (specs->complex_p)
7157 pedwarn ("ISO C does not support complex integer types");
7158 specs->type = build_complex_type (specs->type);
7162 gcc_assert (!(specs->long_p && specs->short_p));
7163 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7164 if (specs->long_long_p)
7165 specs->type = (specs->unsigned_p
7166 ? long_long_unsigned_type_node
7167 : long_long_integer_type_node);
7168 else if (specs->long_p)
7169 specs->type = (specs->unsigned_p
7170 ? long_unsigned_type_node
7171 : long_integer_type_node);
7172 else if (specs->short_p)
7173 specs->type = (specs->unsigned_p
7174 ? short_unsigned_type_node
7175 : short_integer_type_node);
7177 specs->type = (specs->unsigned_p
7178 ? unsigned_type_node
7179 : integer_type_node);
7180 if (specs->complex_p)
7183 pedwarn ("ISO C does not support complex integer types");
7184 specs->type = build_complex_type (specs->type);
7188 gcc_assert (!specs->long_p && !specs->short_p
7189 && !specs->signed_p && !specs->unsigned_p);
7190 specs->type = (specs->complex_p
7191 ? complex_float_type_node
7195 gcc_assert (!specs->long_long_p && !specs->short_p
7196 && !specs->signed_p && !specs->unsigned_p);
7199 specs->type = (specs->complex_p
7200 ? complex_long_double_type_node
7201 : long_double_type_node);
7205 specs->type = (specs->complex_p
7206 ? complex_double_type_node
7207 : double_type_node);
7217 /* Synthesize a function which calls all the global ctors or global
7218 dtors in this file. This is only used for targets which do not
7219 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7221 build_cdtor (int method_type, tree cdtors)
7228 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7229 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7232 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7235 /* Perform final processing on one file scope's declarations (or the
7236 external scope's declarations), GLOBALS. */
7238 c_write_global_declarations_1 (tree globals)
7240 size_t len = list_length (globals);
7241 tree *vec = XNEWVEC (tree, len);
7245 /* Process the decls in the order they were written. */
7246 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
7249 /* Check for used but undefined static functions using the C
7250 standard's definition of "used", and set TREE_NO_WARNING so
7251 that check_global_declarations doesn't repeat the check. */
7252 if (TREE_CODE (decl) == FUNCTION_DECL
7253 && DECL_INITIAL (decl) == 0
7254 && DECL_EXTERNAL (decl)
7255 && !TREE_PUBLIC (decl)
7256 && C_DECL_USED (decl))
7258 pedwarn ("%J%qF used but never defined", decl, decl);
7259 TREE_NO_WARNING (decl) = 1;
7263 wrapup_global_declarations (vec, len);
7264 check_global_declarations (vec, len);
7270 c_write_global_declarations (void)
7274 /* We don't want to do this if generating a PCH. */
7278 /* Don't waste time on further processing if -fsyntax-only or we've
7279 encountered errors. */
7280 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7283 /* Close the external scope. */
7284 ext_block = pop_scope ();
7286 gcc_assert (!current_scope);
7288 /* Process all file scopes in this compilation, and the external_scope,
7289 through wrapup_global_declarations and check_global_declarations. */
7290 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7291 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7292 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7294 /* Generate functions to call static constructors and destructors
7295 for targets that do not support .ctors/.dtors sections. These
7296 functions have magic names which are detected by collect2. */
7297 build_cdtor ('I', static_ctors); static_ctors = 0;
7298 build_cdtor ('D', static_dtors); static_dtors = 0;
7300 /* We're done parsing; proceed to optimize and emit assembly.
7301 FIXME: shouldn't be the front end's responsibility to call this. */
7305 #include "gt-c-decl.h"