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 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2701 tree value = declspecs->type;
2702 enum tree_code code = TREE_CODE (value);
2704 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2705 /* Used to test also that TYPE_SIZE (value) != 0.
2706 That caused warning for `struct foo;' at top level in the file. */
2708 tree name = TYPE_NAME (value);
2715 if (warned != 1 && code != ENUMERAL_TYPE)
2716 /* Empty unnamed enum OK */
2718 pedwarn ("unnamed struct/union that defines no instances");
2722 else if (!declspecs->tag_defined_p
2723 && declspecs->storage_class != csc_none)
2726 pedwarn ("empty declaration with storage class specifier "
2727 "does not redeclare tag");
2729 pending_xref_error ();
2731 else if (!declspecs->tag_defined_p
2732 && (declspecs->const_p
2733 || declspecs->volatile_p
2734 || declspecs->restrict_p))
2737 pedwarn ("empty declaration with type qualifier "
2738 "does not redeclare tag");
2740 pending_xref_error ();
2744 pending_invalid_xref = 0;
2745 t = lookup_tag (code, name, 1);
2749 t = make_node (code);
2756 if (warned != 1 && !in_system_header)
2758 pedwarn ("useless type name in empty declaration");
2763 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2765 pedwarn ("useless type name in empty declaration");
2769 pending_invalid_xref = 0;
2771 if (declspecs->inline_p)
2773 error ("%<inline%> in empty declaration");
2777 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2779 error ("%<auto%> in file-scope empty declaration");
2783 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2785 error ("%<register%> in file-scope empty declaration");
2789 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2791 warning ("useless storage class specifier in empty declaration");
2795 if (!warned && !in_system_header && declspecs->thread_p)
2797 warning ("useless %<__thread%> in empty declaration");
2801 if (!warned && !in_system_header && (declspecs->const_p
2802 || declspecs->volatile_p
2803 || declspecs->restrict_p))
2805 warning ("useless type qualifier in empty declaration");
2812 pedwarn ("empty declaration");
2817 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2818 bits. SPECS represents declaration specifiers that the grammar
2819 only permits to contain type qualifiers and attributes. */
2822 quals_from_declspecs (const struct c_declspecs *specs)
2824 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
2825 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
2826 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
2827 gcc_assert (!specs->type
2828 && !specs->decl_attr
2829 && specs->typespec_word == cts_none
2830 && specs->storage_class == csc_none
2831 && !specs->typedef_p
2832 && !specs->explicit_signed_p
2833 && !specs->deprecated_p
2835 && !specs->long_long_p
2838 && !specs->unsigned_p
2839 && !specs->complex_p
2841 && !specs->thread_p);
2845 /* Construct an array declarator. EXPR is the expression inside [], or
2846 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2847 to the pointer to which a parameter array is converted). STATIC_P is
2848 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2849 is true if the array is [*], a VLA of unspecified length which is
2850 nevertheless a complete type (not currently implemented by GCC),
2851 false otherwise. The field for the contained declarator is left to be
2852 filled in by set_array_declarator_inner. */
2854 struct c_declarator *
2855 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
2858 struct c_declarator *declarator = XOBNEW (&parser_obstack,
2859 struct c_declarator);
2860 declarator->kind = cdk_array;
2861 declarator->declarator = 0;
2862 declarator->u.array.dimen = expr;
2865 declarator->u.array.attrs = quals->attrs;
2866 declarator->u.array.quals = quals_from_declspecs (quals);
2870 declarator->u.array.attrs = NULL_TREE;
2871 declarator->u.array.quals = 0;
2873 declarator->u.array.static_p = static_p;
2874 declarator->u.array.vla_unspec_p = vla_unspec_p;
2875 if (pedantic && !flag_isoc99)
2877 if (static_p || quals != NULL)
2878 pedwarn ("ISO C90 does not support %<static%> or type "
2879 "qualifiers in parameter array declarators");
2881 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
2884 warning ("GCC does not yet properly implement %<[*]%> array declarators");
2888 /* Set the contained declarator of an array declarator. DECL is the
2889 declarator, as constructed by build_array_declarator; INNER is what
2890 appears on the left of the []. ABSTRACT_P is true if it is an
2891 abstract declarator, false otherwise; this is used to reject static
2892 and type qualifiers in abstract declarators, where they are not in
2893 the C99 grammar (subject to possible change in DR#289). */
2895 struct c_declarator *
2896 set_array_declarator_inner (struct c_declarator *decl,
2897 struct c_declarator *inner, bool abstract_p)
2899 decl->declarator = inner;
2900 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
2901 || decl->u.array.attrs != NULL_TREE
2902 || decl->u.array.static_p))
2903 error ("static or type qualifiers in abstract declarator");
2907 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2910 groktypename (struct c_type_name *type_name)
2913 tree attrs = type_name->specs->attrs;
2915 type_name->specs->attrs = NULL_TREE;
2917 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
2920 /* Apply attributes. */
2921 decl_attributes (&type, attrs, 0);
2926 /* Decode a declarator in an ordinary declaration or data definition.
2927 This is called as soon as the type information and variable name
2928 have been parsed, before parsing the initializer if any.
2929 Here we create the ..._DECL node, fill in its type,
2930 and put it on the list of decls for the current context.
2931 The ..._DECL node is returned as the value.
2933 Exception: for arrays where the length is not specified,
2934 the type is left null, to be filled in by `finish_decl'.
2936 Function definitions do not come here; they go to start_function
2937 instead. However, external and forward declarations of functions
2938 do go through here. Structure field declarations are done by
2939 grokfield and not through here. */
2942 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
2943 bool initialized, tree attributes)
2948 /* An object declared as __attribute__((deprecated)) suppresses
2949 warnings of uses of other deprecated items. */
2950 if (lookup_attribute ("deprecated", attributes))
2951 deprecated_state = DEPRECATED_SUPPRESS;
2953 decl = grokdeclarator (declarator, declspecs,
2954 NORMAL, initialized, NULL);
2956 deprecated_state = DEPRECATED_NORMAL;
2958 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2959 && MAIN_NAME_P (DECL_NAME (decl)))
2960 warning ("%J%qD is usually a function", decl, decl);
2963 /* Is it valid for this decl to have an initializer at all?
2964 If not, set INITIALIZED to zero, which will indirectly
2965 tell 'finish_decl' to ignore the initializer once it is parsed. */
2966 switch (TREE_CODE (decl))
2969 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
2974 error ("function %qD is initialized like a variable", decl);
2979 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2980 error ("parameter %qD is initialized", decl);
2985 /* Don't allow initializations for incomplete types except for
2986 arrays which might be completed by the initialization. */
2988 /* This can happen if the array size is an undefined macro.
2989 We already gave a warning, so we don't need another one. */
2990 if (TREE_TYPE (decl) == error_mark_node)
2992 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2994 /* A complete type is ok if size is fixed. */
2996 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2997 || C_DECL_VARIABLE_SIZE (decl))
2999 error ("variable-sized object may not be initialized");
3003 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3005 error ("variable %qD has initializer but incomplete type", decl);
3008 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3010 error ("elements of array %qD have incomplete type", decl);
3013 else if (C_DECL_VARIABLE_SIZE (decl))
3015 /* Although C99 is unclear about whether incomplete arrays
3016 of VLAs themselves count as VLAs, it does not make
3017 sense to permit them to be initialized given that
3018 ordinary VLAs may not be initialized. */
3019 error ("variable-sized object may not be initialized");
3026 if (current_scope == file_scope)
3027 TREE_STATIC (decl) = 1;
3029 /* Tell 'pushdecl' this is an initialized decl
3030 even though we don't yet have the initializer expression.
3031 Also tell 'finish_decl' it may store the real initializer. */
3032 DECL_INITIAL (decl) = error_mark_node;
3035 /* If this is a function declaration, write a record describing it to the
3036 prototypes file (if requested). */
3038 if (TREE_CODE (decl) == FUNCTION_DECL)
3039 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3041 /* ANSI specifies that a tentative definition which is not merged with
3042 a non-tentative definition behaves exactly like a definition with an
3043 initializer equal to zero. (Section 3.7.2)
3045 -fno-common gives strict ANSI behavior, though this tends to break
3046 a large body of code that grew up without this rule.
3048 Thread-local variables are never common, since there's no entrenched
3049 body of code to break, and it allows more efficient variable references
3050 in the presence of dynamic linking. */
3052 if (TREE_CODE (decl) == VAR_DECL
3054 && TREE_PUBLIC (decl)
3055 && !DECL_THREAD_LOCAL (decl)
3057 DECL_COMMON (decl) = 1;
3059 /* Set attributes here so if duplicate decl, will have proper attributes. */
3060 decl_attributes (&decl, attributes, 0);
3062 if (TREE_CODE (decl) == FUNCTION_DECL
3063 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3065 struct c_declarator *ce = declarator;
3067 if (ce->kind == cdk_pointer)
3068 ce = declarator->declarator;
3069 if (ce->kind == cdk_function)
3071 tree args = ce->u.arg_info->parms;
3072 for (; args; args = TREE_CHAIN (args))
3074 tree type = TREE_TYPE (args);
3075 if (type && INTEGRAL_TYPE_P (type)
3076 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3077 DECL_ARG_TYPE (args) = integer_type_node;
3082 if (TREE_CODE (decl) == FUNCTION_DECL
3083 && DECL_DECLARED_INLINE_P (decl)
3084 && DECL_UNINLINABLE (decl)
3085 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3086 warning ("%Jinline function %qD given attribute noinline", decl, decl);
3088 /* Add this decl to the current scope.
3089 TEM may equal DECL or it may be a previous decl of the same name. */
3090 tem = pushdecl (decl);
3092 if (initialized && DECL_EXTERNAL (tem))
3094 DECL_EXTERNAL (tem) = 0;
3095 TREE_STATIC (tem) = 1;
3101 /* Finish processing of a declaration;
3102 install its initial value.
3103 If the length of an array type is not known before,
3104 it must be determined now, from the initial value, or it is an error. */
3107 finish_decl (tree decl, tree init, tree asmspec_tree)
3109 tree type = TREE_TYPE (decl);
3110 int was_incomplete = (DECL_SIZE (decl) == 0);
3111 const char *asmspec = 0;
3113 /* If a name was specified, get the string. */
3114 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3115 && DECL_FILE_SCOPE_P (decl))
3116 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3118 asmspec = TREE_STRING_POINTER (asmspec_tree);
3120 /* If `start_decl' didn't like having an initialization, ignore it now. */
3121 if (init != 0 && DECL_INITIAL (decl) == 0)
3124 /* Don't crash if parm is initialized. */
3125 if (TREE_CODE (decl) == PARM_DECL)
3129 store_init_value (decl, init);
3131 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3132 || TREE_CODE (decl) == FUNCTION_DECL
3133 || TREE_CODE (decl) == FIELD_DECL))
3134 objc_check_decl (decl);
3136 /* Deduce size of array from initialization, if not already known. */
3137 if (TREE_CODE (type) == ARRAY_TYPE
3138 && TYPE_DOMAIN (type) == 0
3139 && TREE_CODE (decl) != TYPE_DECL)
3142 = (TREE_STATIC (decl)
3143 /* Even if pedantic, an external linkage array
3144 may have incomplete type at first. */
3145 ? pedantic && !TREE_PUBLIC (decl)
3146 : !DECL_EXTERNAL (decl));
3148 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3150 /* Get the completed type made by complete_array_type. */
3151 type = TREE_TYPE (decl);
3154 error ("%Jinitializer fails to determine size of %qD", decl, decl);
3156 else if (failure == 2)
3159 error ("%Jarray size missing in %qD", decl, decl);
3160 /* If a `static' var's size isn't known,
3161 make it extern as well as static, so it does not get
3163 If it is not `static', then do not mark extern;
3164 finish_incomplete_decl will give it a default size
3165 and it will get allocated. */
3166 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3167 DECL_EXTERNAL (decl) = 1;
3170 /* TYPE_MAX_VALUE is always one less than the number of elements
3171 in the array, because we start counting at zero. Therefore,
3172 warn only if the value is less than zero. */
3173 else if (pedantic && TYPE_DOMAIN (type) != 0
3174 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3175 error ("%Jzero or negative size array %qD", decl, decl);
3177 layout_decl (decl, 0);
3180 if (TREE_CODE (decl) == VAR_DECL)
3182 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3183 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3184 layout_decl (decl, 0);
3186 if (DECL_SIZE (decl) == 0
3187 /* Don't give an error if we already gave one earlier. */
3188 && TREE_TYPE (decl) != error_mark_node
3189 && (TREE_STATIC (decl)
3190 /* A static variable with an incomplete type
3191 is an error if it is initialized.
3192 Also if it is not file scope.
3193 Otherwise, let it through, but if it is not `extern'
3194 then it may cause an error message later. */
3195 ? (DECL_INITIAL (decl) != 0
3196 || !DECL_FILE_SCOPE_P (decl))
3197 /* An automatic variable with an incomplete type
3199 : !DECL_EXTERNAL (decl)))
3201 error ("%Jstorage size of %qD isn%'t known", decl, decl);
3202 TREE_TYPE (decl) = error_mark_node;
3205 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3206 && DECL_SIZE (decl) != 0)
3208 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3209 constant_expression_warning (DECL_SIZE (decl));
3211 error ("%Jstorage size of %qD isn%'t constant", decl, decl);
3214 if (TREE_USED (type))
3215 TREE_USED (decl) = 1;
3218 /* If this is a function and an assembler name is specified, reset DECL_RTL
3219 so we can give it its new name. Also, update built_in_decls if it
3220 was a normal built-in. */
3221 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3223 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3225 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
3226 set_user_assembler_name (builtin, asmspec);
3227 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
3228 init_block_move_fn (asmspec);
3229 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
3230 init_block_clear_fn (asmspec);
3232 set_user_assembler_name (decl, asmspec);
3235 /* If #pragma weak was used, mark the decl weak now. */
3236 if (current_scope == file_scope)
3237 maybe_apply_pragma_weak (decl);
3239 /* If this is a variable definition, determine its ELF visibility. */
3240 if (TREE_CODE (decl) == VAR_DECL
3241 && TREE_STATIC (decl)
3242 && !DECL_EXTERNAL (decl))
3243 c_determine_visibility (decl);
3245 /* Output the assembler code and/or RTL code for variables and functions,
3246 unless the type is an undefined structure or union.
3247 If not, it will get done when the type is completed. */
3249 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3251 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3252 if (c_dialect_objc ())
3253 objc_check_decl (decl);
3257 /* If this is not a static variable, issue a warning.
3258 It doesn't make any sense to give an ASMSPEC for an
3259 ordinary, non-register local variable. Historically,
3260 GCC has accepted -- but ignored -- the ASMSPEC in
3262 if (!DECL_FILE_SCOPE_P (decl)
3263 && TREE_CODE (decl) == VAR_DECL
3264 && !C_DECL_REGISTER (decl)
3265 && !TREE_STATIC (decl))
3266 warning ("%Jignoring asm-specifier for non-static local "
3267 "variable %qD", decl, decl);
3268 else if (C_DECL_REGISTER (decl))
3269 change_decl_assembler_name (decl, get_identifier (asmspec));
3271 set_user_assembler_name (decl, asmspec);
3274 if (DECL_FILE_SCOPE_P (decl))
3276 if (DECL_INITIAL (decl) == NULL_TREE
3277 || DECL_INITIAL (decl) == error_mark_node)
3278 /* Don't output anything
3279 when a tentative file-scope definition is seen.
3280 But at end of compilation, do output code for them. */
3281 DECL_DEFER_OUTPUT (decl) = 1;
3282 rest_of_decl_compilation (decl, true, 0);
3286 /* In conjunction with an ASMSPEC, the `register'
3287 keyword indicates that we should place the variable
3288 in a particular register. */
3289 if (asmspec && C_DECL_REGISTER (decl))
3291 DECL_HARD_REGISTER (decl) = 1;
3292 /* This cannot be done for a structure with volatile
3293 fields, on which DECL_REGISTER will have been
3295 if (!DECL_REGISTER (decl))
3296 error ("cannot put object with volatile field into register");
3299 if (TREE_CODE (decl) != FUNCTION_DECL)
3301 /* If we're building a variable sized type, and we might be
3302 reachable other than via the top of the current binding
3303 level, then create a new BIND_EXPR so that we deallocate
3304 the object at the right time. */
3305 /* Note that DECL_SIZE can be null due to errors. */
3306 if (DECL_SIZE (decl)
3307 && !TREE_CONSTANT (DECL_SIZE (decl))
3308 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3311 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3312 TREE_SIDE_EFFECTS (bind) = 1;
3314 BIND_EXPR_BODY (bind) = push_stmt_list ();
3316 add_stmt (build_stmt (DECL_EXPR, decl));
3321 if (!DECL_FILE_SCOPE_P (decl))
3323 /* Recompute the RTL of a local array now
3324 if it used to be an incomplete type. */
3326 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3328 /* If we used it already as memory, it must stay in memory. */
3329 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3330 /* If it's still incomplete now, no init will save it. */
3331 if (DECL_SIZE (decl) == 0)
3332 DECL_INITIAL (decl) = 0;
3337 /* If this was marked 'used', be sure it will be output. */
3338 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3339 mark_decl_referenced (decl);
3341 if (TREE_CODE (decl) == TYPE_DECL)
3343 if (!DECL_FILE_SCOPE_P (decl)
3344 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3345 add_stmt (build_stmt (DECL_EXPR, decl));
3347 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3350 /* At the end of a declaration, throw away any variable type sizes
3351 of types defined inside that declaration. There is no use
3352 computing them in the following function definition. */
3353 if (current_scope == file_scope)
3354 get_pending_sizes ();
3356 /* Install a cleanup (aka destructor) if one was given. */
3357 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3359 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3362 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3363 tree cleanup_decl = lookup_name (cleanup_id);
3366 /* Build "cleanup(&decl)" for the destructor. */
3367 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3368 cleanup = build_tree_list (NULL_TREE, cleanup);
3369 cleanup = build_function_call (cleanup_decl, cleanup);
3371 /* Don't warn about decl unused; the cleanup uses it. */
3372 TREE_USED (decl) = 1;
3373 TREE_USED (cleanup_decl) = 1;
3375 /* Initialize EH, if we've been told to do so. */
3376 if (flag_exceptions && !c_eh_initialized_p)
3378 c_eh_initialized_p = true;
3379 eh_personality_libfunc
3380 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3381 ? "__gcc_personality_sj0"
3382 : "__gcc_personality_v0");
3383 using_eh_for_cleanups ();
3386 push_cleanup (decl, cleanup, false);
3391 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3394 grokparm (const struct c_parm *parm)
3396 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3399 decl_attributes (&decl, parm->attrs, 0);
3404 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3405 and push that on the current scope. */
3408 push_parm_decl (const struct c_parm *parm)
3412 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3413 decl_attributes (&decl, parm->attrs, 0);
3415 decl = pushdecl (decl);
3417 finish_decl (decl, NULL_TREE, NULL_TREE);
3420 /* Mark all the parameter declarations to date as forward decls.
3421 Also diagnose use of this extension. */
3424 mark_forward_parm_decls (void)
3426 struct c_binding *b;
3428 if (pedantic && !current_scope->warned_forward_parm_decls)
3430 pedwarn ("ISO C forbids forward parameter declarations");
3431 current_scope->warned_forward_parm_decls = true;
3434 for (b = current_scope->bindings; b; b = b->prev)
3435 if (TREE_CODE (b->decl) == PARM_DECL)
3436 TREE_ASM_WRITTEN (b->decl) = 1;
3439 static GTY(()) int compound_literal_number;
3441 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3442 literal, which may be an incomplete array type completed by the
3443 initializer; INIT is a CONSTRUCTOR that initializes the compound
3447 build_compound_literal (tree type, tree init)
3449 /* We do not use start_decl here because we have a type, not a declarator;
3450 and do not use finish_decl because the decl should be stored inside
3451 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3456 if (type == error_mark_node)
3457 return error_mark_node;
3459 decl = build_decl (VAR_DECL, NULL_TREE, type);
3460 DECL_EXTERNAL (decl) = 0;
3461 TREE_PUBLIC (decl) = 0;
3462 TREE_STATIC (decl) = (current_scope == file_scope);
3463 DECL_CONTEXT (decl) = current_function_decl;
3464 TREE_USED (decl) = 1;
3465 TREE_TYPE (decl) = type;
3466 TREE_READONLY (decl) = TYPE_READONLY (type);
3467 store_init_value (decl, init);
3469 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3471 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3473 gcc_assert (!failure);
3476 type = TREE_TYPE (decl);
3477 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3478 return error_mark_node;
3480 stmt = build_stmt (DECL_EXPR, decl);
3481 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3482 TREE_SIDE_EFFECTS (complit) = 1;
3484 layout_decl (decl, 0);
3486 if (TREE_STATIC (decl))
3488 /* This decl needs a name for the assembler output. We also need
3489 a unique suffix to be added to the name. */
3492 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3493 compound_literal_number);
3494 compound_literal_number++;
3495 DECL_NAME (decl) = get_identifier (name);
3496 DECL_DEFER_OUTPUT (decl) = 1;
3497 DECL_COMDAT (decl) = 1;
3498 DECL_ARTIFICIAL (decl) = 1;
3500 rest_of_decl_compilation (decl, 1, 0);
3506 /* Make TYPE a complete type based on INITIAL_VALUE.
3507 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3508 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3511 complete_array_type (tree type, tree initial_value, int do_default)
3513 tree maxindex = NULL_TREE;
3518 /* Note MAXINDEX is really the maximum index,
3519 one less than the size. */
3520 if (TREE_CODE (initial_value) == STRING_CST)
3523 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3524 maxindex = build_int_cst (NULL_TREE,
3525 (TREE_STRING_LENGTH (initial_value)
3528 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3530 tree elts = CONSTRUCTOR_ELTS (initial_value);
3531 maxindex = build_int_cst (NULL_TREE, -1);
3532 for (; elts; elts = TREE_CHAIN (elts))
3534 if (TREE_PURPOSE (elts))
3535 maxindex = TREE_PURPOSE (elts);
3537 maxindex = fold (build2 (PLUS_EXPR, integer_type_node,
3538 maxindex, integer_one_node));
3543 /* Make an error message unless that happened already. */
3544 if (initial_value != error_mark_node)
3547 /* Prevent further error messages. */
3548 maxindex = build_int_cst (NULL_TREE, 0);
3555 maxindex = build_int_cst (NULL_TREE, 0);
3561 TYPE_DOMAIN (type) = build_index_type (maxindex);
3563 gcc_assert (TREE_TYPE (maxindex));
3566 /* Lay out the type now that we can get the real answer. */
3573 /* Determine whether TYPE is a structure with a flexible array member,
3574 or a union containing such a structure (possibly recursively). */
3577 flexible_array_type_p (tree type)
3580 switch (TREE_CODE (type))
3583 x = TYPE_FIELDS (type);
3586 while (TREE_CHAIN (x) != NULL_TREE)
3588 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3589 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3590 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3591 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3595 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3597 if (flexible_array_type_p (TREE_TYPE (x)))
3606 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3607 replacing with appropriate values if they are invalid. */
3609 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3612 unsigned int max_width;
3613 unsigned HOST_WIDE_INT w;
3614 const char *name = orig_name ? orig_name: _("<anonymous>");
3617 STRIP_NOPS (*width);
3619 /* Detect and ignore out of range field width and process valid
3621 if (TREE_CODE (*width) != INTEGER_CST)
3623 error ("bit-field %qs width not an integer constant", name);
3624 *width = integer_one_node;
3628 constant_expression_warning (*width);
3629 if (tree_int_cst_sgn (*width) < 0)
3631 error ("negative width in bit-field %qs", name);
3632 *width = integer_one_node;
3634 else if (integer_zerop (*width) && orig_name)
3636 error ("zero width for bit-field %qs", name);
3637 *width = integer_one_node;
3641 /* Detect invalid bit-field type. */
3642 if (TREE_CODE (*type) != INTEGER_TYPE
3643 && TREE_CODE (*type) != BOOLEAN_TYPE
3644 && TREE_CODE (*type) != ENUMERAL_TYPE)
3646 error ("bit-field %qs has invalid type", name);
3647 *type = unsigned_type_node;
3650 type_mv = TYPE_MAIN_VARIANT (*type);
3652 && type_mv != integer_type_node
3653 && type_mv != unsigned_type_node
3654 && type_mv != boolean_type_node)
3655 pedwarn ("type of bit-field %qs is a GCC extension", name);
3657 if (type_mv == boolean_type_node)
3658 max_width = CHAR_TYPE_SIZE;
3660 max_width = TYPE_PRECISION (*type);
3662 if (0 < compare_tree_int (*width, max_width))
3664 error ("width of %qs exceeds its type", name);
3666 *width = build_int_cst (NULL_TREE, w);
3669 w = tree_low_cst (*width, 1);
3671 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3673 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3675 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3676 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3677 warning ("%qs is narrower than values of its type", name);
3681 /* Given declspecs and a declarator,
3682 determine the name and type of the object declared
3683 and construct a ..._DECL node for it.
3684 (In one case we can return a ..._TYPE node instead.
3685 For invalid input we sometimes return 0.)
3687 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3689 DECL_CONTEXT says which syntactic context this declaration is in:
3690 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3691 FUNCDEF for a function definition. Like NORMAL but a few different
3692 error messages in each case. Return value may be zero meaning
3693 this definition is too screwy to try to parse.
3694 PARM for a parameter declaration (either within a function prototype
3695 or before a function body). Make a PARM_DECL, or return void_type_node.
3696 TYPENAME if for a typename (in a cast or sizeof).
3697 Don't make a DECL node; just return the ..._TYPE node.
3698 FIELD for a struct or union field; make a FIELD_DECL.
3699 INITIALIZED is true if the decl has an initializer.
3700 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3701 representing the width of the bit-field.
3703 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3704 It may also be so in the PARM case, for a prototype where the
3705 argument type is specified but not the name.
3707 This function is where the complicated C meanings of `static'
3708 and `extern' are interpreted. */
3711 grokdeclarator (const struct c_declarator *declarator,
3712 struct c_declspecs *declspecs,
3713 enum decl_context decl_context, bool initialized, tree *width)
3715 tree type = declspecs->type;
3716 bool threadp = declspecs->thread_p;
3717 enum c_storage_class storage_class = declspecs->storage_class;
3721 int type_quals = TYPE_UNQUALIFIED;
3722 const char *name, *orig_name;
3723 tree typedef_type = 0;
3724 int funcdef_flag = 0;
3725 bool funcdef_syntax = false;
3726 int size_varies = 0;
3727 tree decl_attr = declspecs->decl_attr;
3728 int array_ptr_quals = TYPE_UNQUALIFIED;
3729 tree array_ptr_attrs = NULL_TREE;
3730 int array_parm_static = 0;
3731 tree returned_attrs = NULL_TREE;
3732 bool bitfield = width != NULL;
3734 struct c_arg_info *arg_info = 0;
3736 if (decl_context == FUNCDEF)
3737 funcdef_flag = 1, decl_context = NORMAL;
3739 /* Look inside a declarator for the name being declared
3740 and get it as a string, for an error message. */
3742 const struct c_declarator *decl = declarator;
3751 funcdef_syntax = (decl->kind == cdk_function);
3752 decl = decl->declarator;
3756 decl = decl->declarator;
3761 name = IDENTIFIER_POINTER (decl->u.id);
3773 /* A function definition's declarator must have the form of
3774 a function declarator. */
3776 if (funcdef_flag && !funcdef_syntax)
3779 /* If this looks like a function definition, make it one,
3780 even if it occurs where parms are expected.
3781 Then store_parm_decls will reject it and not use it as a parm. */
3782 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3783 decl_context = PARM;
3785 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3786 warn_deprecated_use (declspecs->type);
3788 typedef_type = type;
3789 size_varies = C_TYPE_VARIABLE_SIZE (type);
3791 /* Diagnose defaulting to "int". */
3793 if (declspecs->default_int_p && !in_system_header)
3795 /* Issue a warning if this is an ISO C 99 program or if
3796 -Wreturn-type and this is a function, or if -Wimplicit;
3797 prefer the former warning since it is more explicit. */
3798 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3800 warn_about_return_type = 1;
3801 else if (warn_implicit_int || flag_isoc99)
3802 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
3805 /* Adjust the type if a bit-field is being declared,
3806 -funsigned-bitfields applied and the type is not explicitly
3808 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
3809 && TREE_CODE (type) == INTEGER_TYPE)
3810 type = c_common_unsigned_type (type);
3812 /* Check the type and width of a bit-field. */
3814 check_bitfield_type_and_width (&type, width, orig_name);
3816 /* Figure out the type qualifiers for the declaration. There are
3817 two ways a declaration can become qualified. One is something
3818 like `const int i' where the `const' is explicit. Another is
3819 something like `typedef const int CI; CI i' where the type of the
3820 declaration contains the `const'. A third possibility is that
3821 there is a type qualifier on the element type of a typedefed
3822 array type, in which case we should extract that qualifier so
3823 that c_apply_type_quals_to_decls receives the full list of
3824 qualifiers to work with (C90 is not entirely clear about whether
3825 duplicate qualifiers should be diagnosed in this case, but it
3826 seems most appropriate to do so). */
3827 element_type = strip_array_types (type);
3828 constp = declspecs->const_p + TYPE_READONLY (element_type);
3829 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
3830 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
3831 if (pedantic && !flag_isoc99)
3834 pedwarn ("duplicate %<const%>");
3836 pedwarn ("duplicate %<restrict%>");
3838 pedwarn ("duplicate %<volatile%>");
3840 if (!flag_gen_aux_info && (TYPE_QUALS (type)))
3841 type = TYPE_MAIN_VARIANT (type);
3842 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3843 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3844 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3846 /* Warn about storage classes that are invalid for certain
3847 kinds of declarations (parameters, typenames, etc.). */
3851 || storage_class == csc_auto
3852 || storage_class == csc_register
3853 || storage_class == csc_typedef))
3855 if (storage_class == csc_auto
3856 && (pedantic || current_scope == file_scope))
3857 pedwarn ("function definition declared %<auto%>");
3858 if (storage_class == csc_register)
3859 error ("function definition declared %<register%>");
3860 if (storage_class == csc_typedef)
3861 error ("function definition declared %<typedef%>");
3863 error ("function definition declared %<__thread%>");
3865 if (storage_class == csc_auto
3866 || storage_class == csc_register
3867 || storage_class == csc_typedef)
3868 storage_class = csc_none;
3870 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
3872 if (decl_context == PARM && storage_class == csc_register)
3876 switch (decl_context)
3879 error ("storage class specified for structure field %qs",
3883 error ("storage class specified for parameter %qs", name);
3886 error ("storage class specified for typename");
3889 storage_class = csc_none;
3893 else if (storage_class == csc_extern
3897 /* 'extern' with initialization is invalid if not at file scope. */
3898 if (current_scope == file_scope)
3899 warning ("%qs initialized and declared %<extern%>", name);
3901 error ("%qs has both %<extern%> and initializer", name);
3903 else if (current_scope == file_scope)
3905 if (storage_class == csc_auto)
3906 error ("file-scope declaration of %qs specifies %<auto%>", name);
3907 if (pedantic && storage_class == csc_register)
3908 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
3912 if (storage_class == csc_extern && funcdef_flag)
3913 error ("nested function %qs declared %<extern%>", name);
3914 else if (threadp && storage_class == csc_none)
3916 error ("function-scope %qs implicitly auto and declared "
3923 /* Now figure out the structure of the declarator proper.
3924 Descend through it, creating more complex types, until we reach
3925 the declared identifier (or NULL_TREE, in an absolute declarator). */
3927 while (declarator && declarator->kind != cdk_id)
3929 if (type == error_mark_node)
3931 declarator = declarator->declarator;
3935 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
3936 a cdk_pointer (for *...),
3937 a cdk_function (for ...(...)),
3938 a cdk_attrs (for nested attributes),
3939 or a cdk_id (for the name being declared
3940 or the place in an absolute declarator
3941 where the name was omitted).
3942 For the last case, we have just exited the loop.
3944 At this point, TYPE is the type of elements of an array,
3945 or for a function to return, or for a pointer to point to.
3946 After this sequence of ifs, TYPE is the type of the
3947 array or function or pointer, and DECLARATOR has had its
3948 outermost layer removed. */
3950 if (array_ptr_quals != TYPE_UNQUALIFIED
3951 || array_ptr_attrs != NULL_TREE
3952 || array_parm_static)
3954 /* Only the innermost declarator (making a parameter be of
3955 array type which is converted to pointer type)
3956 may have static or type qualifiers. */
3957 error ("static or type qualifiers in non-parameter array declarator");
3958 array_ptr_quals = TYPE_UNQUALIFIED;
3959 array_ptr_attrs = NULL_TREE;
3960 array_parm_static = 0;
3963 switch (declarator->kind)
3967 /* A declarator with embedded attributes. */
3968 tree attrs = declarator->u.attrs;
3969 const struct c_declarator *inner_decl;
3971 declarator = declarator->declarator;
3972 inner_decl = declarator;
3973 while (inner_decl->kind == cdk_attrs)
3974 inner_decl = inner_decl->declarator;
3975 if (inner_decl->kind == cdk_id)
3976 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3977 else if (inner_decl->kind == cdk_function)
3978 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3979 else if (inner_decl->kind == cdk_array)
3980 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3981 returned_attrs = decl_attributes (&type,
3982 chainon (returned_attrs, attrs),
3988 tree itype = NULL_TREE;
3989 tree size = declarator->u.array.dimen;
3990 /* The index is a signed object `sizetype' bits wide. */
3991 tree index_type = c_common_signed_type (sizetype);
3993 array_ptr_quals = declarator->u.array.quals;
3994 array_ptr_attrs = declarator->u.array.attrs;
3995 array_parm_static = declarator->u.array.static_p;
3997 declarator = declarator->declarator;
3999 /* Check for some types that there cannot be arrays of. */
4001 if (VOID_TYPE_P (type))
4003 error ("declaration of %qs as array of voids", name);
4004 type = error_mark_node;
4007 if (TREE_CODE (type) == FUNCTION_TYPE)
4009 error ("declaration of %qs as array of functions", name);
4010 type = error_mark_node;
4013 if (pedantic && !in_system_header && flexible_array_type_p (type))
4014 pedwarn ("invalid use of structure with flexible array member");
4016 if (size == error_mark_node)
4017 type = error_mark_node;
4019 if (type == error_mark_node)
4022 /* If size was specified, set ITYPE to a range-type for
4023 that size. Otherwise, ITYPE remains null. finish_decl
4024 may figure it out from an initial value. */
4028 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4030 STRIP_TYPE_NOPS (size);
4032 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4034 error ("size of array %qs has non-integer type", name);
4035 size = integer_one_node;
4038 if (pedantic && integer_zerop (size))
4039 pedwarn ("ISO C forbids zero-size array %qs", name);
4041 if (TREE_CODE (size) == INTEGER_CST)
4043 constant_expression_warning (size);
4044 if (tree_int_cst_sgn (size) < 0)
4046 error ("size of array %qs is negative", name);
4047 size = integer_one_node;
4052 /* Make sure the array size remains visibly
4053 nonconstant even if it is (eg) a const variable
4054 with known value. */
4057 if (!flag_isoc99 && pedantic)
4059 if (TREE_CONSTANT (size))
4060 pedwarn ("ISO C90 forbids array %qs whose size "
4061 "can%'t be evaluated",
4064 pedwarn ("ISO C90 forbids variable-size array %qs",
4069 if (integer_zerop (size))
4071 /* A zero-length array cannot be represented with
4072 an unsigned index type, which is what we'll
4073 get with build_index_type. Create an
4074 open-ended range instead. */
4075 itype = build_range_type (sizetype, size, NULL_TREE);
4079 /* Compute the maximum valid index, that is, size
4080 - 1. Do the calculation in index_type, so that
4081 if it is a variable the computations will be
4082 done in the proper mode. */
4083 itype = fold (build2 (MINUS_EXPR, index_type,
4084 convert (index_type, size),
4085 convert (index_type,
4088 /* If that overflowed, the array is too big. ???
4089 While a size of INT_MAX+1 technically shouldn't
4090 cause an overflow (because we subtract 1), the
4091 overflow is recorded during the conversion to
4092 index_type, before the subtraction. Handling
4093 this case seems like an unnecessary
4095 if (TREE_OVERFLOW (itype))
4097 error ("size of array %qs is too large", name);
4098 type = error_mark_node;
4103 itype = variable_size (itype);
4104 itype = build_index_type (itype);
4107 else if (decl_context == FIELD)
4109 if (pedantic && !flag_isoc99 && !in_system_header)
4110 pedwarn ("ISO C90 does not support flexible array members");
4112 /* ISO C99 Flexible array members are effectively
4113 identical to GCC's zero-length array extension. */
4114 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4117 /* If pedantic, complain about arrays of incomplete types. */
4118 if (pedantic && !COMPLETE_TYPE_P (type))
4119 pedwarn ("array type has incomplete element type");
4121 /* Build the array type itself, then merge any constancy
4122 or volatility into the target type. We must do it in
4123 this order to ensure that the TYPE_MAIN_VARIANT field
4124 of the array type is set correctly. */
4125 type = build_array_type (type, itype);
4127 type = c_build_qualified_type (type, type_quals);
4130 C_TYPE_VARIABLE_SIZE (type) = 1;
4132 /* The GCC extension for zero-length arrays differs from
4133 ISO flexible array members in that sizeof yields
4135 if (size && integer_zerop (size))
4138 TYPE_SIZE (type) = bitsize_zero_node;
4139 TYPE_SIZE_UNIT (type) = size_zero_node;
4141 else if (declarator->kind == cdk_pointer)
4142 /* We can never complete an array type which is the
4143 target of a pointer, so go ahead and lay it out. */
4146 if (decl_context != PARM
4147 && (array_ptr_quals != TYPE_UNQUALIFIED
4148 || array_ptr_attrs != NULL_TREE
4149 || array_parm_static))
4151 error ("static or type qualifiers in non-parameter array declarator");
4152 array_ptr_quals = TYPE_UNQUALIFIED;
4153 array_ptr_attrs = NULL_TREE;
4154 array_parm_static = 0;
4160 /* Say it's a definition only for the declarator closest
4161 to the identifier, apart possibly from some
4163 bool really_funcdef = false;
4167 const struct c_declarator *t = declarator->declarator;
4168 while (t->kind == cdk_attrs)
4170 really_funcdef = (t->kind == cdk_id);
4173 /* Declaring a function type. Make sure we have a valid
4174 type for the function to return. */
4175 if (type == error_mark_node)
4180 /* Warn about some types functions can't return. */
4181 if (TREE_CODE (type) == FUNCTION_TYPE)
4183 error ("%qs declared as function returning a function", name);
4184 type = integer_type_node;
4186 if (TREE_CODE (type) == ARRAY_TYPE)
4188 error ("%qs declared as function returning an array", name);
4189 type = integer_type_node;
4192 /* Construct the function type and go to the next
4193 inner layer of declarator. */
4194 arg_info = declarator->u.arg_info;
4195 arg_types = grokparms (arg_info, really_funcdef);
4197 /* Type qualifiers before the return type of the function
4198 qualify the return type, not the function type. */
4201 /* Type qualifiers on a function return type are
4202 normally permitted by the standard but have no
4203 effect, so give a warning at -Wreturn-type.
4204 Qualifiers on a void return type are banned on
4205 function definitions in ISO C; GCC used to used
4206 them for noreturn functions. */
4207 if (VOID_TYPE_P (type) && really_funcdef)
4208 pedwarn ("function definition has qualified void return type");
4209 else if (warn_return_type)
4210 warning ("type qualifiers ignored on function return type");
4212 type = c_build_qualified_type (type, type_quals);
4214 type_quals = TYPE_UNQUALIFIED;
4216 type = build_function_type (type, arg_types);
4217 declarator = declarator->declarator;
4219 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4220 the formal parameter list of this FUNCTION_TYPE to point to
4221 the FUNCTION_TYPE node itself. */
4225 for (link = arg_info->tags;
4227 link = TREE_CHAIN (link))
4228 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4234 /* Merge any constancy or volatility into the target type
4237 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4239 pedwarn ("ISO C forbids qualified function types");
4241 type = c_build_qualified_type (type, type_quals);
4244 type = build_pointer_type (type);
4246 /* Process type qualifiers (such as const or volatile)
4247 that were given inside the `*'. */
4248 type_quals = declarator->u.pointer_quals;
4250 declarator = declarator->declarator;
4258 /* Now TYPE has the actual type. */
4260 /* Did array size calculations overflow? */
4262 if (TREE_CODE (type) == ARRAY_TYPE
4263 && COMPLETE_TYPE_P (type)
4264 && TREE_OVERFLOW (TYPE_SIZE (type)))
4266 error ("size of array %qs is too large", name);
4267 /* If we proceed with the array type as it is, we'll eventually
4268 crash in tree_low_cst(). */
4269 type = error_mark_node;
4272 /* If this is declaring a typedef name, return a TYPE_DECL. */
4274 if (storage_class == csc_typedef)
4277 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4279 pedwarn ("ISO C forbids qualified function types");
4281 type = c_build_qualified_type (type, type_quals);
4282 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4283 if (declspecs->explicit_signed_p)
4284 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4285 decl_attributes (&decl, returned_attrs, 0);
4286 if (declspecs->inline_p)
4287 pedwarn ("%Jtypedef %qD declared %<inline%>", decl, decl);
4291 /* Detect the case of an array type of unspecified size
4292 which came, as such, direct from a typedef name.
4293 We must copy the type, so that each identifier gets
4294 a distinct type, so that each identifier's size can be
4295 controlled separately by its own initializer. */
4297 if (type != 0 && typedef_type != 0
4298 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4299 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4301 type = build_array_type (TREE_TYPE (type), 0);
4303 C_TYPE_VARIABLE_SIZE (type) = 1;
4306 /* If this is a type name (such as, in a cast or sizeof),
4307 compute the type and return it now. */
4309 if (decl_context == TYPENAME)
4311 /* Note that the grammar rejects storage classes in typenames
4313 gcc_assert (storage_class == csc_none && !threadp
4314 && !declspecs->inline_p);
4315 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4317 pedwarn ("ISO C forbids const or volatile function types");
4319 type = c_build_qualified_type (type, type_quals);
4320 decl_attributes (&type, returned_attrs, 0);
4324 /* Aside from typedefs and type names (handle above),
4325 `void' at top level (not within pointer)
4326 is allowed only in public variables.
4327 We don't complain about parms either, but that is because
4328 a better error message can be made later. */
4330 if (VOID_TYPE_P (type) && decl_context != PARM
4331 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4332 && (storage_class == csc_extern
4333 || (current_scope == file_scope
4334 && !(storage_class == csc_static
4335 || storage_class == csc_register)))))
4337 error ("variable or field %qs declared void", name);
4338 type = integer_type_node;
4341 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4342 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4347 if (decl_context == PARM)
4349 tree type_as_written;
4352 /* A parameter declared as an array of T is really a pointer to T.
4353 One declared as a function is really a pointer to a function. */
4355 if (TREE_CODE (type) == ARRAY_TYPE)
4357 /* Transfer const-ness of array into that of type pointed to. */
4358 type = TREE_TYPE (type);
4360 type = c_build_qualified_type (type, type_quals);
4361 type = build_pointer_type (type);
4362 type_quals = array_ptr_quals;
4364 /* We don't yet implement attributes in this context. */
4365 if (array_ptr_attrs != NULL_TREE)
4366 warning ("attributes in parameter array declarator ignored");
4370 else if (TREE_CODE (type) == FUNCTION_TYPE)
4372 if (pedantic && type_quals)
4373 pedwarn ("ISO C forbids qualified function types");
4375 type = c_build_qualified_type (type, type_quals);
4376 type = build_pointer_type (type);
4377 type_quals = TYPE_UNQUALIFIED;
4379 else if (type_quals)
4380 type = c_build_qualified_type (type, type_quals);
4382 type_as_written = type;
4384 decl = build_decl (PARM_DECL, declarator->u.id, type);
4386 C_DECL_VARIABLE_SIZE (decl) = 1;
4388 /* Compute the type actually passed in the parmlist,
4389 for the case where there is no prototype.
4390 (For example, shorts and chars are passed as ints.)
4391 When there is a prototype, this is overridden later. */
4393 if (type == error_mark_node)
4394 promoted_type = type;
4396 promoted_type = c_type_promotes_to (type);
4398 DECL_ARG_TYPE (decl) = promoted_type;
4399 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4400 if (declspecs->inline_p)
4401 pedwarn ("%Jparameter %qD declared %<inline%>", decl, decl);
4403 else if (decl_context == FIELD)
4405 /* Note that the grammar rejects storage classes in typenames
4407 gcc_assert (storage_class == csc_none && !threadp
4408 && !declspecs->inline_p);
4410 /* Structure field. It may not be a function. */
4412 if (TREE_CODE (type) == FUNCTION_TYPE)
4414 error ("field %qs declared as a function", name);
4415 type = build_pointer_type (type);
4417 else if (TREE_CODE (type) != ERROR_MARK
4418 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4420 error ("field %qs has incomplete type", name);
4421 type = error_mark_node;
4423 /* Move type qualifiers down to element of an array. */
4424 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4425 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4427 TYPE_DOMAIN (type));
4428 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4429 DECL_NONADDRESSABLE_P (decl) = bitfield;
4432 C_DECL_VARIABLE_SIZE (decl) = 1;
4434 else if (TREE_CODE (type) == FUNCTION_TYPE)
4436 if (storage_class == csc_register || threadp)
4437 error ("invalid storage class for function %qs", name);
4438 else if (current_scope != file_scope)
4440 /* Function declaration not at file scope. Storage
4441 classes other than `extern' are not allowed, C99
4442 6.7.1p5, and `extern' makes no difference. However,
4443 GCC allows 'auto', perhaps with 'inline', to support
4444 nested functions. */
4445 if (storage_class == csc_auto)
4448 pedwarn ("invalid storage class for function %qs", name);
4450 if (storage_class == csc_static)
4451 error ("invalid storage class for function %qs", name);
4454 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4455 decl = build_decl_attribute_variant (decl, decl_attr);
4457 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4459 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4460 pedwarn ("ISO C forbids qualified function types");
4462 /* GNU C interprets a volatile-qualified function type to indicate
4463 that the function does not return. */
4464 if ((type_quals & TYPE_QUAL_VOLATILE)
4465 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4466 warning ("%<noreturn%> function returns non-void value");
4468 /* Every function declaration is an external reference
4469 (DECL_EXTERNAL) except for those which are not at file
4470 scope and are explicitly declared "auto". This is
4471 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4472 GCC to signify a forward declaration of a nested function. */
4473 if (storage_class == csc_auto && current_scope != file_scope)
4474 DECL_EXTERNAL (decl) = 0;
4476 DECL_EXTERNAL (decl) = 1;
4478 /* Record absence of global scope for `static' or `auto'. */
4480 = !(storage_class == csc_static || storage_class == csc_auto);
4482 /* For a function definition, record the argument information
4483 block where store_parm_decls will look for it. */
4485 current_function_arg_info = arg_info;
4487 if (declspecs->default_int_p)
4488 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4490 /* Record presence of `inline', if it is reasonable. */
4491 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4493 if (declspecs->inline_p)
4494 pedwarn ("cannot inline function %<main%>");
4496 else if (declspecs->inline_p)
4498 /* Record that the function is declared `inline'. */
4499 DECL_DECLARED_INLINE_P (decl) = 1;
4501 /* Do not mark bare declarations as DECL_INLINE. Doing so
4502 in the presence of multiple declarations can result in
4503 the abstract origin pointing between the declarations,
4504 which will confuse dwarf2out. */
4507 DECL_INLINE (decl) = 1;
4508 if (storage_class == csc_extern)
4509 current_extern_inline = 1;
4512 /* If -finline-functions, assume it can be inlined. This does
4513 two things: let the function be deferred until it is actually
4514 needed, and let dwarf2 know that the function is inlinable. */
4515 else if (flag_inline_trees == 2 && initialized)
4516 DECL_INLINE (decl) = 1;
4520 /* It's a variable. */
4521 /* An uninitialized decl with `extern' is a reference. */
4522 int extern_ref = !initialized && storage_class == csc_extern;
4524 /* Move type qualifiers down to element of an array. */
4525 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4527 int saved_align = TYPE_ALIGN(type);
4528 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4530 TYPE_DOMAIN (type));
4531 TYPE_ALIGN (type) = saved_align;
4533 else if (type_quals)
4534 type = c_build_qualified_type (type, type_quals);
4536 /* C99 6.2.2p7: It is invalid (compile-time undefined
4537 behavior) to create an 'extern' declaration for a
4538 variable if there is a global declaration that is
4539 'static' and the global declaration is not visible.
4540 (If the static declaration _is_ currently visible,
4541 the 'extern' declaration is taken to refer to that decl.) */
4542 if (extern_ref && current_scope != file_scope)
4544 tree global_decl = identifier_global_value (declarator->u.id);
4545 tree visible_decl = lookup_name (declarator->u.id);
4548 && global_decl != visible_decl
4549 && TREE_CODE (global_decl) == VAR_DECL
4550 && !TREE_PUBLIC (global_decl))
4551 error ("variable previously declared %<static%> redeclared "
4555 decl = build_decl (VAR_DECL, declarator->u.id, type);
4557 C_DECL_VARIABLE_SIZE (decl) = 1;
4559 if (declspecs->inline_p)
4560 pedwarn ("%Jvariable %qD declared %<inline%>", decl, decl);
4562 /* At file scope, an initialized extern declaration may follow
4563 a static declaration. In that case, DECL_EXTERNAL will be
4564 reset later in start_decl. */
4565 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4567 /* At file scope, the presence of a `static' or `register' storage
4568 class specifier, or the absence of all storage class specifiers
4569 makes this declaration a definition (perhaps tentative). Also,
4570 the absence of both `static' and `register' makes it public. */
4571 if (current_scope == file_scope)
4573 TREE_PUBLIC (decl) = !(storage_class == csc_static
4574 || storage_class == csc_register);
4575 TREE_STATIC (decl) = !extern_ref;
4577 /* Not at file scope, only `static' makes a static definition. */
4580 TREE_STATIC (decl) = (storage_class == csc_static);
4581 TREE_PUBLIC (decl) = extern_ref;
4586 if (targetm.have_tls)
4587 DECL_THREAD_LOCAL (decl) = 1;
4589 /* A mere warning is sure to result in improper semantics
4590 at runtime. Don't bother to allow this to compile. */
4591 error ("thread-local storage not supported for this target");
4595 /* Record `register' declaration for warnings on &
4596 and in case doing stupid register allocation. */
4598 if (storage_class == csc_register)
4600 C_DECL_REGISTER (decl) = 1;
4601 DECL_REGISTER (decl) = 1;
4604 /* Record constancy and volatility. */
4605 c_apply_type_quals_to_decl (type_quals, decl);
4607 /* If a type has volatile components, it should be stored in memory.
4608 Otherwise, the fact that those components are volatile
4609 will be ignored, and would even crash the compiler. */
4610 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4612 /* It is not an error for a structure with volatile fields to
4613 be declared register, but reset DECL_REGISTER since it
4614 cannot actually go in a register. */
4615 int was_reg = C_DECL_REGISTER (decl);
4616 C_DECL_REGISTER (decl) = 0;
4617 DECL_REGISTER (decl) = 0;
4618 c_mark_addressable (decl);
4619 C_DECL_REGISTER (decl) = was_reg;
4622 /* This is the earliest point at which we might know the assembler
4623 name of a variable. Thus, if it's known before this, die horribly. */
4624 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4626 decl_attributes (&decl, returned_attrs, 0);
4632 /* Decode the parameter-list info for a function type or function definition.
4633 The argument is the value returned by `get_parm_info' (or made in parse.y
4634 if there is an identifier list instead of a parameter decl list).
4635 These two functions are separate because when a function returns
4636 or receives functions then each is called multiple times but the order
4637 of calls is different. The last call to `grokparms' is always the one
4638 that contains the formal parameter names of a function definition.
4640 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4642 FUNCDEF_FLAG is true for a function definition, false for
4643 a mere declaration. A nonempty identifier-list gets an error message
4644 when FUNCDEF_FLAG is false. */
4647 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4649 tree arg_types = arg_info->types;
4651 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4652 && !in_system_header)
4653 warning ("function declaration isn%'t a prototype");
4655 if (arg_types == error_mark_node)
4656 return 0; /* don't set TYPE_ARG_TYPES in this case */
4658 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4661 pedwarn ("parameter names (without types) in function declaration");
4663 arg_info->parms = arg_info->types;
4664 arg_info->types = 0;
4669 tree parm, type, typelt;
4670 unsigned int parmno;
4672 /* If there is a parameter of incomplete type in a definition,
4673 this is an error. In a declaration this is valid, and a
4674 struct or union type may be completed later, before any calls
4675 or definition of the function. In the case where the tag was
4676 first declared within the parameter list, a warning has
4677 already been given. If a parameter has void type, then
4678 however the function cannot be defined or called, so
4681 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4683 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4685 type = TREE_VALUE (typelt);
4686 if (type == error_mark_node)
4689 if (!COMPLETE_TYPE_P (type))
4693 if (DECL_NAME (parm))
4694 error ("%Jparameter %u (%qD) has incomplete type",
4695 parm, parmno, parm);
4697 error ("%Jparameter %u has incomplete type",
4700 TREE_VALUE (typelt) = error_mark_node;
4701 TREE_TYPE (parm) = error_mark_node;
4703 else if (VOID_TYPE_P (type))
4705 if (DECL_NAME (parm))
4706 warning ("%Jparameter %u (%qD) has void type",
4707 parm, parmno, parm);
4709 warning ("%Jparameter %u has void type",
4718 /* Take apart the current scope and return a c_arg_info structure with
4719 info on a parameter list just parsed.
4721 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4723 ELLIPSIS being true means the argument list ended in '...' so don't
4724 append a sentinel (void_list_node) to the end of the type-list. */
4727 get_parm_info (bool ellipsis)
4729 struct c_binding *b = current_scope->bindings;
4730 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4737 static bool explained_incomplete_types = false;
4738 bool gave_void_only_once_err = false;
4740 arg_info->parms = 0;
4742 arg_info->types = 0;
4743 arg_info->others = 0;
4745 /* The bindings in this scope must not get put into a block.
4746 We will take care of deleting the binding nodes. */
4747 current_scope->bindings = 0;
4749 /* This function is only called if there was *something* on the
4753 /* A parameter list consisting solely of 'void' indicates that the
4754 function takes no arguments. But if the 'void' is qualified
4755 (by 'const' or 'volatile'), or has a storage class specifier
4756 ('register'), then the behavior is undefined; issue an error.
4757 Typedefs for 'void' are OK (see DR#157). */
4758 if (b->prev == 0 /* one binding */
4759 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4760 && !DECL_NAME (b->decl) /* anonymous */
4761 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4763 if (TREE_THIS_VOLATILE (b->decl)
4764 || TREE_READONLY (b->decl)
4765 || C_DECL_REGISTER (b->decl))
4766 error ("%<void%> as only parameter may not be qualified");
4768 /* There cannot be an ellipsis. */
4770 error ("%<void%> must be the only parameter");
4772 arg_info->types = void_list_node;
4777 types = void_list_node;
4779 /* Break up the bindings list into parms, tags, types, and others;
4780 apply sanity checks; purge the name-to-decl bindings. */
4783 tree decl = b->decl;
4784 tree type = TREE_TYPE (decl);
4785 const char *keyword;
4787 switch (TREE_CODE (decl))
4792 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4793 I_SYMBOL_BINDING (b->id) = b->shadowed;
4796 /* Check for forward decls that never got their actual decl. */
4797 if (TREE_ASM_WRITTEN (decl))
4798 error ("%Jparameter %qD has just a forward declaration",
4800 /* Check for (..., void, ...) and issue an error. */
4801 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4803 if (!gave_void_only_once_err)
4805 error ("%<void%> must be the only parameter");
4806 gave_void_only_once_err = true;
4811 /* Valid parameter, add it to the list. */
4812 TREE_CHAIN (decl) = parms;
4815 /* Since there is a prototype, args are passed in their
4816 declared types. The back end may override this later. */
4817 DECL_ARG_TYPE (decl) = type;
4818 types = tree_cons (0, type, types);
4822 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4823 case UNION_TYPE: keyword = "union"; goto tag;
4824 case RECORD_TYPE: keyword = "struct"; goto tag;
4826 /* Types may not have tag-names, in which case the type
4827 appears in the bindings list with b->id NULL. */
4830 gcc_assert (I_TAG_BINDING (b->id) == b);
4831 I_TAG_BINDING (b->id) = b->shadowed;
4834 /* Warn about any struct, union or enum tags defined in a
4835 parameter list. The scope of such types is limited to
4836 the parameter list, which is rarely if ever desirable
4837 (it's impossible to call such a function with type-
4838 correct arguments). An anonymous union parm type is
4839 meaningful as a GNU extension, so don't warn for that. */
4840 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4843 /* The %s will be one of 'struct', 'union', or 'enum'. */
4844 warning ("%<%s %E%> declared inside parameter list",
4847 /* The %s will be one of 'struct', 'union', or 'enum'. */
4848 warning ("anonymous %s declared inside parameter list",
4851 if (!explained_incomplete_types)
4853 warning ("its scope is only this definition or declaration,"
4854 " which is probably not what you want");
4855 explained_incomplete_types = true;
4859 tags = tree_cons (b->id, decl, tags);
4864 /* CONST_DECLs appear here when we have an embedded enum,
4865 and TYPE_DECLs appear here when we have an embedded struct
4866 or union. No warnings for this - we already warned about the
4868 TREE_CHAIN (decl) = others;
4873 /* error_mark_node appears here when we have an undeclared
4874 variable. Just throw it away. */
4877 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4878 I_SYMBOL_BINDING (b->id) = b->shadowed;
4882 /* Other things that might be encountered. */
4890 b = free_binding_and_advance (b);
4893 arg_info->parms = parms;
4894 arg_info->tags = tags;
4895 arg_info->types = types;
4896 arg_info->others = others;
4900 /* Get the struct, enum or union (CODE says which) with tag NAME.
4901 Define the tag as a forward-reference if it is not defined.
4902 Return a c_typespec structure for the type specifier. */
4905 parser_xref_tag (enum tree_code code, tree name)
4907 struct c_typespec ret;
4908 /* If a cross reference is requested, look up the type
4909 already defined for this tag and return it. */
4911 tree ref = lookup_tag (code, name, 0);
4912 /* If this is the right type of tag, return what we found.
4913 (This reference will be shadowed by shadow_tag later if appropriate.)
4914 If this is the wrong type of tag, do not return it. If it was the
4915 wrong type in the same scope, we will have had an error
4916 message already; if in a different scope and declaring
4917 a name, pending_xref_error will give an error message; but if in a
4918 different scope and not declaring a name, this tag should
4919 shadow the previous declaration of a different type of tag, and
4920 this would not work properly if we return the reference found.
4921 (For example, with "struct foo" in an outer scope, "union foo;"
4922 must shadow that tag with a new one of union type.) */
4923 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
4924 if (ref && TREE_CODE (ref) == code)
4930 /* If no such tag is yet defined, create a forward-reference node
4931 and record it as the "definition".
4932 When a real declaration of this type is found,
4933 the forward-reference will be altered into a real type. */
4935 ref = make_node (code);
4936 if (code == ENUMERAL_TYPE)
4938 /* Give the type a default layout like unsigned int
4939 to avoid crashing if it does not get defined. */
4940 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4941 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4942 TYPE_USER_ALIGN (ref) = 0;
4943 TYPE_UNSIGNED (ref) = 1;
4944 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4945 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4946 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4949 pushtag (name, ref);
4955 /* Get the struct, enum or union (CODE says which) with tag NAME.
4956 Define the tag as a forward-reference if it is not defined.
4957 Return a tree for the type. */
4960 xref_tag (enum tree_code code, tree name)
4962 return parser_xref_tag (code, name).spec;
4965 /* Make sure that the tag NAME is defined *in the current scope*
4966 at least as a forward reference.
4967 CODE says which kind of tag NAME ought to be. */
4970 start_struct (enum tree_code code, tree name)
4972 /* If there is already a tag defined at this scope
4973 (as a forward reference), just return it. */
4978 ref = lookup_tag (code, name, 1);
4979 if (ref && TREE_CODE (ref) == code)
4981 if (TYPE_SIZE (ref))
4983 if (code == UNION_TYPE)
4984 error ("redefinition of %<union %s%>", IDENTIFIER_POINTER (name));
4986 error ("redefinition of %<struct %s%>", IDENTIFIER_POINTER (name));
4988 else if (C_TYPE_BEING_DEFINED (ref))
4990 if (code == UNION_TYPE)
4991 error ("nested redefinition of %<union %s%>",
4992 IDENTIFIER_POINTER (name));
4994 error ("nested redefinition of %<struct %s%>",
4995 IDENTIFIER_POINTER (name));
5000 /* Otherwise create a forward-reference just so the tag is in scope. */
5002 ref = make_node (code);
5003 pushtag (name, ref);
5006 C_TYPE_BEING_DEFINED (ref) = 1;
5007 TYPE_PACKED (ref) = flag_pack_struct;
5011 /* Process the specs, declarator and width (NULL if omitted)
5012 of a structure component, returning a FIELD_DECL node.
5013 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5015 This is done during the parsing of the struct declaration.
5016 The FIELD_DECL nodes are chained together and the lot of them
5017 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5020 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5025 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5026 && width == NULL_TREE)
5028 /* This is an unnamed decl.
5030 If we have something of the form "union { list } ;" then this
5031 is the anonymous union extension. Similarly for struct.
5033 If this is something of the form "struct foo;", then
5034 If MS extensions are enabled, this is handled as an
5036 Otherwise this is a forward declaration of a structure tag.
5038 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5039 If MS extensions are enabled and foo names a structure, then
5040 again this is an anonymous struct.
5041 Otherwise this is an error.
5043 Oh what a horrid tangled web we weave. I wonder if MS consciously
5044 took this from Plan 9 or if it was an accident of implementation
5045 that took root before someone noticed the bug... */
5047 tree type = declspecs->type;
5048 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5049 || TREE_CODE (type) == UNION_TYPE);
5053 && (flag_ms_extensions || !declspecs->typedef_p))
5055 if (flag_ms_extensions)
5059 else if (TYPE_NAME (type) == NULL)
5066 pedwarn ("declaration does not declare anything");
5070 pedwarn ("ISO C doesn't support unnamed structs/unions");
5073 value = grokdeclarator (declarator, declspecs, FIELD, false,
5074 width ? &width : NULL);
5076 finish_decl (value, NULL_TREE, NULL_TREE);
5077 DECL_INITIAL (value) = width;
5082 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5083 the list such that this does not present a problem later. */
5086 detect_field_duplicates (tree fieldlist)
5091 /* First, see if there are more than "a few" fields.
5092 This is trivially true if there are zero or one fields. */
5095 x = TREE_CHAIN (fieldlist);
5101 } while (timeout > 0 && x);
5103 /* If there were "few" fields, avoid the overhead of allocating
5104 a hash table. Instead just do the nested traversal thing. */
5107 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5110 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5111 if (DECL_NAME (y) == DECL_NAME (x))
5113 error ("%Jduplicate member %qD", x, x);
5114 DECL_NAME (x) = NULL_TREE;
5120 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5123 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5124 if ((y = DECL_NAME (x)) != 0)
5126 slot = htab_find_slot (htab, y, INSERT);
5129 error ("%Jduplicate member %qD", x, x);
5130 DECL_NAME (x) = NULL_TREE;
5139 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5140 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5141 ATTRIBUTES are attributes to be applied to the structure. */
5144 finish_struct (tree t, tree fieldlist, tree attributes)
5147 bool toplevel = file_scope == current_scope;
5148 int saw_named_field;
5150 /* If this type was previously laid out as a forward reference,
5151 make sure we lay it out again. */
5155 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5159 for (x = fieldlist; x; x = TREE_CHAIN (x))
5160 if (DECL_NAME (x) != 0)
5164 pedwarn ("%s has no %s",
5165 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5166 fieldlist ? _("named members") : _("members"));
5169 /* Install struct as DECL_CONTEXT of each field decl.
5170 Also process specified field sizes, found in the DECL_INITIAL,
5171 storing 0 there after the type has been changed to precision equal
5172 to its width, rather than the precision of the specified standard
5173 type. (Correct layout requires the original type to have been preserved
5176 saw_named_field = 0;
5177 for (x = fieldlist; x; x = TREE_CHAIN (x))
5179 DECL_CONTEXT (x) = t;
5180 DECL_PACKED (x) |= TYPE_PACKED (t);
5182 /* If any field is const, the structure type is pseudo-const. */
5183 if (TREE_READONLY (x))
5184 C_TYPE_FIELDS_READONLY (t) = 1;
5187 /* A field that is pseudo-const makes the structure likewise. */
5188 tree t1 = TREE_TYPE (x);
5189 while (TREE_CODE (t1) == ARRAY_TYPE)
5190 t1 = TREE_TYPE (t1);
5191 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5192 && C_TYPE_FIELDS_READONLY (t1))
5193 C_TYPE_FIELDS_READONLY (t) = 1;
5196 /* Any field that is volatile means variables of this type must be
5197 treated in some ways as volatile. */
5198 if (TREE_THIS_VOLATILE (x))
5199 C_TYPE_FIELDS_VOLATILE (t) = 1;
5201 /* Any field of nominal variable size implies structure is too. */
5202 if (C_DECL_VARIABLE_SIZE (x))
5203 C_TYPE_VARIABLE_SIZE (t) = 1;
5205 if (DECL_INITIAL (x))
5207 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5208 DECL_SIZE (x) = bitsize_int (width);
5209 DECL_BIT_FIELD (x) = 1;
5210 SET_DECL_C_BIT_FIELD (x);
5213 /* Detect flexible array member in an invalid context. */
5214 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5215 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5216 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5217 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5219 if (TREE_CODE (t) == UNION_TYPE)
5221 error ("%Jflexible array member in union", x);
5222 TREE_TYPE (x) = error_mark_node;
5224 else if (TREE_CHAIN (x) != NULL_TREE)
5226 error ("%Jflexible array member not at end of struct", x);
5227 TREE_TYPE (x) = error_mark_node;
5229 else if (!saw_named_field)
5231 error ("%Jflexible array member in otherwise empty struct", x);
5232 TREE_TYPE (x) = error_mark_node;
5236 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5237 && flexible_array_type_p (TREE_TYPE (x)))
5238 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5241 saw_named_field = 1;
5244 detect_field_duplicates (fieldlist);
5246 /* Now we have the nearly final fieldlist. Record it,
5247 then lay out the structure or union (including the fields). */
5249 TYPE_FIELDS (t) = fieldlist;
5253 /* Give bit-fields their proper types. */
5255 tree *fieldlistp = &fieldlist;
5257 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5258 && TREE_TYPE (*fieldlistp) != error_mark_node)
5260 unsigned HOST_WIDE_INT width
5261 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5262 tree type = TREE_TYPE (*fieldlistp);
5263 if (width != TYPE_PRECISION (type))
5264 TREE_TYPE (*fieldlistp)
5265 = build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
5266 DECL_INITIAL (*fieldlistp) = 0;
5269 fieldlistp = &TREE_CHAIN (*fieldlistp);
5272 /* Now we have the truly final field list.
5273 Store it in this type and in the variants. */
5275 TYPE_FIELDS (t) = fieldlist;
5277 /* If there are lots of fields, sort so we can look through them fast.
5278 We arbitrarily consider 16 or more elts to be "a lot". */
5283 for (x = fieldlist; x; x = TREE_CHAIN (x))
5285 if (len > 15 || DECL_NAME (x) == NULL)
5293 struct lang_type *space;
5294 struct sorted_fields_type *space2;
5296 len += list_length (x);
5298 /* Use the same allocation policy here that make_node uses, to
5299 ensure that this lives as long as the rest of the struct decl.
5300 All decls in an inline function need to be saved. */
5302 space = GGC_CNEW (struct lang_type);
5303 space2 = GGC_NEWVAR (struct sorted_fields_type,
5304 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5308 field_array = &space2->elts[0];
5309 for (x = fieldlist; x; x = TREE_CHAIN (x))
5311 field_array[len++] = x;
5313 /* If there is anonymous struct or union, break out of the loop. */
5314 if (DECL_NAME (x) == NULL)
5317 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5320 TYPE_LANG_SPECIFIC (t) = space;
5321 TYPE_LANG_SPECIFIC (t)->s->len = len;
5322 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5323 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5328 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5330 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5331 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5332 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5333 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5336 /* If this was supposed to be a transparent union, but we can't
5337 make it one, warn and turn off the flag. */
5338 if (TREE_CODE (t) == UNION_TYPE
5339 && TYPE_TRANSPARENT_UNION (t)
5340 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5342 TYPE_TRANSPARENT_UNION (t) = 0;
5343 warning ("union cannot be made transparent");
5346 /* If this structure or union completes the type of any previous
5347 variable declaration, lay it out and output its rtl. */
5348 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5352 tree decl = TREE_VALUE (x);
5353 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5354 layout_array_type (TREE_TYPE (decl));
5355 if (TREE_CODE (decl) != TYPE_DECL)
5357 layout_decl (decl, 0);
5358 if (c_dialect_objc ())
5359 objc_check_decl (decl);
5360 rest_of_decl_compilation (decl, toplevel, 0);
5365 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5367 /* Finish debugging output for this type. */
5368 rest_of_type_compilation (t, toplevel);
5373 /* Lay out the type T, and its element type, and so on. */
5376 layout_array_type (tree t)
5378 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5379 layout_array_type (TREE_TYPE (t));
5383 /* Begin compiling the definition of an enumeration type.
5384 NAME is its name (or null if anonymous).
5385 Returns the type object, as yet incomplete.
5386 Also records info about it so that build_enumerator
5387 may be used to declare the individual values as they are read. */
5390 start_enum (tree name)
5394 /* If this is the real definition for a previous forward reference,
5395 fill in the contents in the same object that used to be the
5396 forward reference. */
5399 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5401 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5403 enumtype = make_node (ENUMERAL_TYPE);
5404 pushtag (name, enumtype);
5407 if (C_TYPE_BEING_DEFINED (enumtype))
5408 error ("nested redefinition of %<enum %s%>", IDENTIFIER_POINTER (name));
5410 C_TYPE_BEING_DEFINED (enumtype) = 1;
5412 if (TYPE_VALUES (enumtype) != 0)
5414 /* This enum is a named one that has been declared already. */
5415 error ("redeclaration of %<enum %s%>", IDENTIFIER_POINTER (name));
5417 /* Completely replace its old definition.
5418 The old enumerators remain defined, however. */
5419 TYPE_VALUES (enumtype) = 0;
5422 enum_next_value = integer_zero_node;
5425 if (flag_short_enums)
5426 TYPE_PACKED (enumtype) = 1;
5431 /* After processing and defining all the values of an enumeration type,
5432 install their decls in the enumeration type and finish it off.
5433 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5434 and ATTRIBUTES are the specified attributes.
5435 Returns ENUMTYPE. */
5438 finish_enum (tree enumtype, tree values, tree attributes)
5441 tree minnode = 0, maxnode = 0;
5442 int precision, unsign;
5443 bool toplevel = (file_scope == current_scope);
5444 struct lang_type *lt;
5446 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5448 /* Calculate the maximum value of any enumerator in this type. */
5450 if (values == error_mark_node)
5451 minnode = maxnode = integer_zero_node;
5454 minnode = maxnode = TREE_VALUE (values);
5455 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5457 tree value = TREE_VALUE (pair);
5458 if (tree_int_cst_lt (maxnode, value))
5460 if (tree_int_cst_lt (value, minnode))
5465 /* Construct the final type of this enumeration. It is the same
5466 as one of the integral types - the narrowest one that fits, except
5467 that normally we only go as narrow as int - and signed iff any of
5468 the values are negative. */
5469 unsign = (tree_int_cst_sgn (minnode) >= 0);
5470 precision = MAX (min_precision (minnode, unsign),
5471 min_precision (maxnode, unsign));
5473 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5475 tem = c_common_type_for_size (precision, unsign);
5478 warning ("enumeration values exceed range of largest integer");
5479 tem = long_long_integer_type_node;
5483 tem = unsign ? unsigned_type_node : integer_type_node;
5485 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5486 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5487 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5488 TYPE_SIZE (enumtype) = 0;
5490 /* If the precision of the type was specific with an attribute and it
5491 was too small, give an error. Otherwise, use it. */
5492 if (TYPE_PRECISION (enumtype))
5494 if (precision > TYPE_PRECISION (enumtype))
5495 error ("specified mode too small for enumeral values");
5498 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5500 layout_type (enumtype);
5502 if (values != error_mark_node)
5504 /* Change the type of the enumerators to be the enum type. We
5505 need to do this irrespective of the size of the enum, for
5506 proper type checking. Replace the DECL_INITIALs of the
5507 enumerators, and the value slots of the list, with copies
5508 that have the enum type; they cannot be modified in place
5509 because they may be shared (e.g. integer_zero_node) Finally,
5510 change the purpose slots to point to the names of the decls. */
5511 for (pair = values; pair; pair = TREE_CHAIN (pair))
5513 tree enu = TREE_PURPOSE (pair);
5514 tree ini = DECL_INITIAL (enu);
5516 TREE_TYPE (enu) = enumtype;
5518 /* The ISO C Standard mandates enumerators to have type int,
5519 even though the underlying type of an enum type is
5520 unspecified. Here we convert any enumerators that fit in
5521 an int to type int, to avoid promotions to unsigned types
5522 when comparing integers with enumerators that fit in the
5523 int range. When -pedantic is given, build_enumerator()
5524 would have already taken care of those that don't fit. */
5525 if (int_fits_type_p (ini, integer_type_node))
5526 tem = integer_type_node;
5529 ini = convert (tem, ini);
5531 DECL_INITIAL (enu) = ini;
5532 TREE_PURPOSE (pair) = DECL_NAME (enu);
5533 TREE_VALUE (pair) = ini;
5536 TYPE_VALUES (enumtype) = values;
5539 /* Record the min/max values so that we can warn about bit-field
5540 enumerations that are too small for the values. */
5541 lt = GGC_CNEW (struct lang_type);
5542 lt->enum_min = minnode;
5543 lt->enum_max = maxnode;
5544 TYPE_LANG_SPECIFIC (enumtype) = lt;
5546 /* Fix up all variant types of this enum type. */
5547 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5549 if (tem == enumtype)
5551 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5552 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5553 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5554 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5555 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5556 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5557 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5558 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5559 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5560 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5561 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5564 /* Finish debugging output for this type. */
5565 rest_of_type_compilation (enumtype, toplevel);
5570 /* Build and install a CONST_DECL for one value of the
5571 current enumeration type (one that was begun with start_enum).
5572 Return a tree-list containing the CONST_DECL and its value.
5573 Assignment of sequential values by default is handled here. */
5576 build_enumerator (tree name, tree value)
5580 /* Validate and default VALUE. */
5582 /* Remove no-op casts from the value. */
5584 STRIP_TYPE_NOPS (value);
5588 /* Don't issue more errors for error_mark_node (i.e. an
5589 undeclared identifier) - just ignore the value expression. */
5590 if (value == error_mark_node)
5592 else if (TREE_CODE (value) != INTEGER_CST)
5594 error ("enumerator value for %qE is not an integer constant", name);
5599 value = default_conversion (value);
5600 constant_expression_warning (value);
5604 /* Default based on previous value. */
5605 /* It should no longer be possible to have NON_LVALUE_EXPR
5609 value = enum_next_value;
5611 error ("overflow in enumeration values");
5614 if (pedantic && !int_fits_type_p (value, integer_type_node))
5616 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5617 /* XXX This causes -pedantic to change the meaning of the program.
5618 Remove? -zw 2004-03-15 */
5619 value = convert (integer_type_node, value);
5622 /* Set basis for default for next value. */
5623 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5624 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5626 /* Now create a declaration for the enum value name. */
5628 type = TREE_TYPE (value);
5629 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5630 TYPE_PRECISION (integer_type_node)),
5631 (TYPE_PRECISION (type)
5632 >= TYPE_PRECISION (integer_type_node)
5633 && TYPE_UNSIGNED (type)));
5635 decl = build_decl (CONST_DECL, name, type);
5636 DECL_INITIAL (decl) = convert (type, value);
5639 return tree_cons (decl, value, NULL_TREE);
5643 /* Create the FUNCTION_DECL for a function definition.
5644 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5645 the declaration; they describe the function's name and the type it returns,
5646 but twisted together in a fashion that parallels the syntax of C.
5648 This function creates a binding context for the function body
5649 as well as setting up the FUNCTION_DECL in current_function_decl.
5651 Returns 1 on success. If the DECLARATOR is not suitable for a function
5652 (it defines a datum instead), we return 0, which tells
5653 yyparse to report a parse error. */
5656 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5659 tree decl1, old_decl;
5660 tree restype, resdecl;
5662 current_function_returns_value = 0; /* Assume, until we see it does. */
5663 current_function_returns_null = 0;
5664 current_function_returns_abnormally = 0;
5665 warn_about_return_type = 0;
5666 current_extern_inline = 0;
5667 c_switch_stack = NULL;
5669 /* Indicate no valid break/continue context by setting these variables
5670 to some non-null, non-label value. We'll notice and emit the proper
5671 error message in c_finish_bc_stmt. */
5672 c_break_label = c_cont_label = size_zero_node;
5674 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5676 /* If the declarator is not suitable for a function definition,
5677 cause a syntax error. */
5681 decl_attributes (&decl1, attributes, 0);
5683 if (DECL_DECLARED_INLINE_P (decl1)
5684 && DECL_UNINLINABLE (decl1)
5685 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5686 warning ("%Jinline function %qD given attribute noinline", decl1, decl1);
5688 announce_function (decl1);
5690 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5692 error ("return type is an incomplete type");
5693 /* Make it return void instead. */
5695 = build_function_type (void_type_node,
5696 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5699 if (warn_about_return_type)
5700 pedwarn_c99 ("return type defaults to %<int%>");
5702 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5703 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5704 DECL_INITIAL (decl1) = error_mark_node;
5706 /* If this definition isn't a prototype and we had a prototype declaration
5707 before, copy the arg type info from that prototype.
5708 But not if what we had before was a builtin function. */
5709 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5710 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5711 && !DECL_BUILT_IN (old_decl)
5712 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5713 TREE_TYPE (TREE_TYPE (old_decl)))
5714 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5716 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5718 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5721 /* Optionally warn of old-fashioned def with no previous prototype. */
5722 if (warn_strict_prototypes
5723 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5724 && C_DECL_ISNT_PROTOTYPE (old_decl))
5725 warning ("function declaration isn%'t a prototype");
5726 /* Optionally warn of any global def with no previous prototype. */
5727 else if (warn_missing_prototypes
5728 && TREE_PUBLIC (decl1)
5729 && !MAIN_NAME_P (DECL_NAME (decl1))
5730 && C_DECL_ISNT_PROTOTYPE (old_decl))
5731 warning ("%Jno previous prototype for %qD", decl1, decl1);
5732 /* Optionally warn of any def with no previous prototype
5733 if the function has already been used. */
5734 else if (warn_missing_prototypes
5735 && old_decl != 0 && TREE_USED (old_decl)
5736 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5737 warning ("%J%qD was used with no prototype before its definition",
5739 /* Optionally warn of any global def with no previous declaration. */
5740 else if (warn_missing_declarations
5741 && TREE_PUBLIC (decl1)
5743 && !MAIN_NAME_P (DECL_NAME (decl1)))
5744 warning ("%Jno previous declaration for %qD", decl1, decl1);
5745 /* Optionally warn of any def with no previous declaration
5746 if the function has already been used. */
5747 else if (warn_missing_declarations
5748 && old_decl != 0 && TREE_USED (old_decl)
5749 && C_DECL_IMPLICIT (old_decl))
5750 warning ("%J%qD was used with no declaration before its definition",
5753 /* This is a definition, not a reference.
5754 So normally clear DECL_EXTERNAL.
5755 However, `extern inline' acts like a declaration
5756 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5757 DECL_EXTERNAL (decl1) = current_extern_inline;
5759 /* This function exists in static storage.
5760 (This does not mean `static' in the C sense!) */
5761 TREE_STATIC (decl1) = 1;
5763 /* A nested function is not global. */
5764 if (current_function_decl != 0)
5765 TREE_PUBLIC (decl1) = 0;
5767 /* This is the earliest point at which we might know the assembler
5768 name of the function. Thus, if it's set before this, die horribly. */
5769 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5771 /* If #pragma weak was used, mark the decl weak now. */
5772 if (current_scope == file_scope)
5773 maybe_apply_pragma_weak (decl1);
5775 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5776 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5781 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5782 != integer_type_node)
5783 pedwarn ("%Jreturn type of %qD is not %<int%>", decl1, decl1);
5785 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5786 args = TREE_CHAIN (args))
5788 tree type = args ? TREE_VALUE (args) : 0;
5790 if (type == void_type_node)
5797 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5798 pedwarn ("%Jfirst argument of %qD should be %<int%>",
5803 if (TREE_CODE (type) != POINTER_TYPE
5804 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5805 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5807 pedwarn ("%Jsecond argument of %qD should be %<char **%>",
5812 if (TREE_CODE (type) != POINTER_TYPE
5813 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5814 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5816 pedwarn ("%Jthird argument of %qD should probably be "
5817 "%<char **%>", decl1, decl1);
5822 /* It is intentional that this message does not mention the third
5823 argument because it's only mentioned in an appendix of the
5825 if (argct > 0 && (argct < 2 || argct > 3))
5826 pedwarn ("%J%qD takes only zero or two arguments", decl1, decl1);
5828 if (!TREE_PUBLIC (decl1))
5829 pedwarn ("%J%qD is normally a non-static function", decl1, decl1);
5832 /* Record the decl so that the function name is defined.
5833 If we already have a decl for this name, and it is a FUNCTION_DECL,
5834 use the old decl. */
5836 current_function_decl = pushdecl (decl1);
5839 declare_parm_level ();
5841 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5842 /* Promote the value to int before returning it. */
5843 if (c_promoting_integer_type_p (restype))
5845 /* It retains unsignedness if not really getting wider. */
5846 if (TYPE_UNSIGNED (restype)
5847 && (TYPE_PRECISION (restype)
5848 == TYPE_PRECISION (integer_type_node)))
5849 restype = unsigned_type_node;
5851 restype = integer_type_node;
5854 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
5855 DECL_ARTIFICIAL (resdecl) = 1;
5856 DECL_IGNORED_P (resdecl) = 1;
5857 DECL_RESULT (current_function_decl) = resdecl;
5859 start_fname_decls ();
5864 /* Subroutine of store_parm_decls which handles new-style function
5865 definitions (prototype format). The parms already have decls, so we
5866 need only record them as in effect and complain if any redundant
5867 old-style parm decls were written. */
5869 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
5873 if (current_scope->bindings)
5875 error ("%Jold-style parameter declarations in prototyped "
5876 "function definition", fndecl);
5878 /* Get rid of the old-style declarations. */
5882 /* Don't issue this warning for nested functions, and don't issue this
5883 warning if we got here because ARG_INFO_TYPES was error_mark_node
5884 (this happens when a function definition has just an ellipsis in
5885 its parameter list). */
5886 else if (warn_traditional && !in_system_header && !current_function_scope
5887 && arg_info->types != error_mark_node)
5888 warning ("%Jtraditional C rejects ISO C style function definitions",
5891 /* Now make all the parameter declarations visible in the function body.
5892 We can bypass most of the grunt work of pushdecl. */
5893 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
5895 DECL_CONTEXT (decl) = current_function_decl;
5896 if (DECL_NAME (decl))
5897 bind (DECL_NAME (decl), decl, current_scope,
5898 /*invisible=*/false, /*nested=*/false);
5900 error ("%Jparameter name omitted", decl);
5903 /* Record the parameter list in the function declaration. */
5904 DECL_ARGUMENTS (fndecl) = arg_info->parms;
5906 /* Now make all the ancillary declarations visible, likewise. */
5907 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
5909 DECL_CONTEXT (decl) = current_function_decl;
5910 if (DECL_NAME (decl))
5911 bind (DECL_NAME (decl), decl, current_scope,
5912 /*invisible=*/false, /*nested=*/false);
5915 /* And all the tag declarations. */
5916 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
5917 if (TREE_PURPOSE (decl))
5918 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
5919 /*invisible=*/false, /*nested=*/false);
5922 /* Subroutine of store_parm_decls which handles old-style function
5923 definitions (separate parameter list and declarations). */
5926 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
5928 struct c_binding *b;
5929 tree parm, decl, last;
5930 tree parmids = arg_info->parms;
5932 /* We use DECL_WEAK as a flag to show which parameters have been
5933 seen already, since it is not used on PARM_DECL. */
5934 #ifdef ENABLE_CHECKING
5935 for (b = current_scope->bindings; b; b = b->prev)
5936 gcc_assert (TREE_CODE (b->decl) != PARM_DECL || !DECL_WEAK (b->decl));
5939 if (warn_old_style_definition && !in_system_header)
5940 warning ("%Jold-style function definition", fndecl);
5942 /* Match each formal parameter name with its declaration. Save each
5943 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5944 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5946 if (TREE_VALUE (parm) == 0)
5948 error ("%Jparameter name missing from parameter list", fndecl);
5949 TREE_PURPOSE (parm) = 0;
5953 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
5954 if (b && B_IN_CURRENT_SCOPE (b))
5957 /* If we got something other than a PARM_DECL it is an error. */
5958 if (TREE_CODE (decl) != PARM_DECL)
5959 error ("%J%qD declared as a non-parameter", decl, decl);
5960 /* If the declaration is already marked, we have a duplicate
5961 name. Complain and ignore the duplicate. */
5962 else if (DECL_WEAK (decl))
5964 error ("%Jmultiple parameters named %qD", decl, decl);
5965 TREE_PURPOSE (parm) = 0;
5968 /* If the declaration says "void", complain and turn it into
5970 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5972 error ("%Jparameter %qD declared with void type", decl, decl);
5973 TREE_TYPE (decl) = integer_type_node;
5974 DECL_ARG_TYPE (decl) = integer_type_node;
5975 layout_decl (decl, 0);
5978 /* If no declaration found, default to int. */
5981 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5982 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5983 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5987 pedwarn ("%Jtype of %qD defaults to %<int%>", decl, decl);
5988 else if (extra_warnings)
5989 warning ("%Jtype of %qD defaults to %<int%>", decl, decl);
5992 TREE_PURPOSE (parm) = decl;
5993 DECL_WEAK (decl) = 1;
5996 /* Now examine the parms chain for incomplete declarations
5997 and declarations with no corresponding names. */
5999 for (b = current_scope->bindings; b; b = b->prev)
6002 if (TREE_CODE (parm) != PARM_DECL)
6005 if (TREE_TYPE (parm) != error_mark_node
6006 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6008 error ("%Jparameter %qD has incomplete type", parm, parm);
6009 TREE_TYPE (parm) = error_mark_node;
6012 if (!DECL_WEAK (parm))
6014 error ("%Jdeclaration for parameter %qD but no such parameter",
6017 /* Pretend the parameter was not missing.
6018 This gets us to a standard state and minimizes
6019 further error messages. */
6020 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6024 /* Chain the declarations together in the order of the list of
6025 names. Store that chain in the function decl, replacing the
6026 list of names. Update the current scope to match. */
6027 DECL_ARGUMENTS (fndecl) = 0;
6029 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6030 if (TREE_PURPOSE (parm))
6032 if (parm && TREE_PURPOSE (parm))
6034 last = TREE_PURPOSE (parm);
6035 DECL_ARGUMENTS (fndecl) = last;
6036 DECL_WEAK (last) = 0;
6038 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6039 if (TREE_PURPOSE (parm))
6041 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6042 last = TREE_PURPOSE (parm);
6043 DECL_WEAK (last) = 0;
6045 TREE_CHAIN (last) = 0;
6048 /* If there was a previous prototype,
6049 set the DECL_ARG_TYPE of each argument according to
6050 the type previously specified, and report any mismatches. */
6052 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6055 for (parm = DECL_ARGUMENTS (fndecl),
6056 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6057 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6058 != void_type_node));
6059 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6061 if (parm == 0 || type == 0
6062 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6064 error ("number of arguments doesn%'t match prototype");
6065 error ("%Hprototype declaration",
6066 ¤t_function_prototype_locus);
6069 /* Type for passing arg must be consistent with that
6070 declared for the arg. ISO C says we take the unqualified
6071 type for parameters declared with qualified type. */
6072 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6073 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6075 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6076 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6078 /* Adjust argument to match prototype. E.g. a previous
6079 `int foo(float);' prototype causes
6080 `int foo(x) float x; {...}' to be treated like
6081 `int foo(float x) {...}'. This is particularly
6082 useful for argument types like uid_t. */
6083 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6085 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6086 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6087 && TYPE_PRECISION (TREE_TYPE (parm))
6088 < TYPE_PRECISION (integer_type_node))
6089 DECL_ARG_TYPE (parm) = integer_type_node;
6093 pedwarn ("promoted argument %qD "
6094 "doesn%'t match prototype", parm);
6095 pedwarn ("%Hprototype declaration",
6096 ¤t_function_prototype_locus);
6101 error ("argument %qD doesn%'t match prototype", parm);
6102 error ("%Hprototype declaration",
6103 ¤t_function_prototype_locus);
6107 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6110 /* Otherwise, create a prototype that would match. */
6114 tree actual = 0, last = 0, type;
6116 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6118 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6120 TREE_CHAIN (last) = type;
6125 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6127 TREE_CHAIN (last) = type;
6131 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6132 of the type of this function, but we need to avoid having this
6133 affect the types of other similarly-typed functions, so we must
6134 first force the generation of an identical (but separate) type
6135 node for the relevant function type. The new node we create
6136 will be a variant of the main variant of the original function
6139 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6141 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6145 /* Store parameter declarations passed in ARG_INFO into the current
6146 function declaration. */
6149 store_parm_decls_from (struct c_arg_info *arg_info)
6151 current_function_arg_info = arg_info;
6152 store_parm_decls ();
6155 /* Store the parameter declarations into the current function declaration.
6156 This is called after parsing the parameter declarations, before
6157 digesting the body of the function.
6159 For an old-style definition, construct a prototype out of the old-style
6160 parameter declarations and inject it into the function's type. */
6163 store_parm_decls (void)
6165 tree fndecl = current_function_decl;
6168 /* The argument information block for FNDECL. */
6169 struct c_arg_info *arg_info = current_function_arg_info;
6170 current_function_arg_info = 0;
6172 /* True if this definition is written with a prototype. Note:
6173 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6174 list in a function definition as equivalent to (void) -- an
6175 empty argument list specifies the function has no parameters,
6176 but only (void) sets up a prototype for future calls. */
6177 proto = arg_info->types != 0;
6180 store_parm_decls_newstyle (fndecl, arg_info);
6182 store_parm_decls_oldstyle (fndecl, arg_info);
6184 /* The next call to push_scope will be a function body. */
6186 next_is_function_body = true;
6188 /* Write a record describing this function definition to the prototypes
6189 file (if requested). */
6191 gen_aux_info_record (fndecl, 1, 0, proto);
6193 /* Initialize the RTL code for the function. */
6194 allocate_struct_function (fndecl);
6196 /* Begin the statement tree for this function. */
6197 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6199 /* ??? Insert the contents of the pending sizes list into the function
6200 to be evaluated. This just changes mis-behavior until assign_parms
6201 phase ordering problems are resolved. */
6204 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6205 add_stmt (TREE_VALUE (t));
6208 /* Even though we're inside a function body, we still don't want to
6209 call expand_expr to calculate the size of a variable-sized array.
6210 We haven't necessarily assigned RTL to all variables yet, so it's
6211 not safe to try to expand expressions involving them. */
6212 cfun->x_dont_save_pending_sizes_p = 1;
6215 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6219 c_warn_unused_result_recursively (tree fndecl)
6221 struct cgraph_node *cgn;
6223 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6224 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6226 /* Finalize all nested functions now. */
6227 cgn = cgraph_node (fndecl);
6228 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6229 c_warn_unused_result_recursively (cgn->decl);
6232 /* Finish up a function declaration and compile that function
6233 all the way to assembler language output. The free the storage
6234 for the function definition.
6236 This is called after parsing the body of the function definition. */
6239 finish_function (void)
6241 tree fndecl = current_function_decl;
6243 if (TREE_CODE (fndecl) == FUNCTION_DECL
6244 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6246 tree args = DECL_ARGUMENTS (fndecl);
6247 for (; args; args = TREE_CHAIN (args))
6249 tree type = TREE_TYPE (args);
6250 if (INTEGRAL_TYPE_P (type)
6251 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6252 DECL_ARG_TYPE (args) = integer_type_node;
6256 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6257 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6259 /* Must mark the RESULT_DECL as being in this function. */
6261 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6262 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6264 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6266 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6267 != integer_type_node)
6269 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6270 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6272 pedwarn ("%Jreturn type of %qD is not %<int%>", fndecl, fndecl);
6277 c_finish_return (integer_zero_node);
6281 /* Tie off the statement tree for this function. */
6282 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6284 finish_fname_decls ();
6286 /* Complain if there's just no return statement. */
6287 if (warn_return_type
6288 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6289 && !current_function_returns_value && !current_function_returns_null
6290 /* Don't complain if we abort. */
6291 && !current_function_returns_abnormally
6292 /* Don't warn for main(). */
6293 && !MAIN_NAME_P (DECL_NAME (fndecl))
6294 /* Or if they didn't actually specify a return type. */
6295 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6296 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6297 inline function, as we might never be compiled separately. */
6298 && DECL_INLINE (fndecl))
6299 warning ("no return statement in function returning non-void");
6301 /* With just -Wextra, complain only if function returns both with
6302 and without a value. */
6304 && current_function_returns_value
6305 && current_function_returns_null)
6306 warning ("this function may return with or without a value");
6308 /* Store the end of the function, so that we get good line number
6309 info for the epilogue. */
6310 cfun->function_end_locus = input_location;
6312 /* If we don't have ctors/dtors sections, and this is a static
6313 constructor or destructor, it must be recorded now. */
6314 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6315 && !targetm.have_ctors_dtors)
6316 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6317 if (DECL_STATIC_DESTRUCTOR (fndecl)
6318 && !targetm.have_ctors_dtors)
6319 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6321 /* Finalize the ELF visibility for the function. */
6322 c_determine_visibility (fndecl);
6324 /* Genericize before inlining. Delay genericizing nested functions
6325 until their parent function is genericized. Since finalizing
6326 requires GENERIC, delay that as well. */
6328 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6330 if (!decl_function_context (fndecl))
6332 c_genericize (fndecl);
6333 c_warn_unused_result_recursively (fndecl);
6335 /* ??? Objc emits functions after finalizing the compilation unit.
6336 This should be cleaned up later and this conditional removed. */
6337 if (cgraph_global_info_ready)
6339 c_expand_body (fndecl);
6343 cgraph_finalize_function (fndecl, false);
6347 /* Register this function with cgraph just far enough to get it
6348 added to our parent's nested function list. Handy, since the
6349 C front end doesn't have such a list. */
6350 (void) cgraph_node (fndecl);
6354 /* We're leaving the context of this function, so zap cfun.
6355 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6356 tree_rest_of_compilation. */
6358 current_function_decl = NULL;
6361 /* Generate the RTL for the body of FNDECL. */
6364 c_expand_body (tree fndecl)
6367 if (!DECL_INITIAL (fndecl)
6368 || DECL_INITIAL (fndecl) == error_mark_node)
6371 tree_rest_of_compilation (fndecl);
6373 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6374 && targetm.have_ctors_dtors)
6375 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6376 DEFAULT_INIT_PRIORITY);
6377 if (DECL_STATIC_DESTRUCTOR (fndecl)
6378 && targetm.have_ctors_dtors)
6379 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6380 DEFAULT_INIT_PRIORITY);
6383 /* Check the declarations given in a for-loop for satisfying the C99
6386 check_for_loop_decls (void)
6388 struct c_binding *b;
6392 /* If we get here, declarations have been used in a for loop without
6393 the C99 for loop scope. This doesn't make much sense, so don't
6395 error ("%<for%> loop initial declaration used outside C99 mode");
6398 /* C99 subclause 6.8.5 paragraph 3:
6400 [#3] The declaration part of a for statement shall only
6401 declare identifiers for objects having storage class auto or
6404 It isn't clear whether, in this sentence, "identifiers" binds to
6405 "shall only declare" or to "objects" - that is, whether all identifiers
6406 declared must be identifiers for objects, or whether the restriction
6407 only applies to those that are. (A question on this in comp.std.c
6408 in November 2000 received no answer.) We implement the strictest
6409 interpretation, to avoid creating an extension which later causes
6412 for (b = current_scope->bindings; b; b = b->prev)
6415 tree decl = b->decl;
6420 switch (TREE_CODE (decl))
6423 if (TREE_STATIC (decl))
6424 error ("%Jdeclaration of static variable %qD in %<for%> loop "
6425 "initial declaration", decl, decl);
6426 else if (DECL_EXTERNAL (decl))
6427 error ("%Jdeclaration of %<extern%> variable %qD in %<for%> loop "
6428 "initial declaration", decl, decl);
6432 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6436 error ("%<union %E%> declared in %<for%> loop initial declaration",
6440 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6444 error ("%Jdeclaration of non-variable %qD in %<for%> loop "
6445 "initial declaration", decl, decl);
6450 /* Save and reinitialize the variables
6451 used during compilation of a C function. */
6454 c_push_function_context (struct function *f)
6456 struct language_function *p;
6457 p = GGC_NEW (struct language_function);
6460 p->base.x_stmt_tree = c_stmt_tree;
6461 p->x_break_label = c_break_label;
6462 p->x_cont_label = c_cont_label;
6463 p->x_switch_stack = c_switch_stack;
6464 p->arg_info = current_function_arg_info;
6465 p->returns_value = current_function_returns_value;
6466 p->returns_null = current_function_returns_null;
6467 p->returns_abnormally = current_function_returns_abnormally;
6468 p->warn_about_return_type = warn_about_return_type;
6469 p->extern_inline = current_extern_inline;
6472 /* Restore the variables used during compilation of a C function. */
6475 c_pop_function_context (struct function *f)
6477 struct language_function *p = f->language;
6479 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6480 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6482 /* Stop pointing to the local nodes about to be freed. */
6483 /* But DECL_INITIAL must remain nonzero so we know this
6484 was an actual function definition. */
6485 DECL_INITIAL (current_function_decl) = error_mark_node;
6486 DECL_ARGUMENTS (current_function_decl) = 0;
6489 c_stmt_tree = p->base.x_stmt_tree;
6490 c_break_label = p->x_break_label;
6491 c_cont_label = p->x_cont_label;
6492 c_switch_stack = p->x_switch_stack;
6493 current_function_arg_info = p->arg_info;
6494 current_function_returns_value = p->returns_value;
6495 current_function_returns_null = p->returns_null;
6496 current_function_returns_abnormally = p->returns_abnormally;
6497 warn_about_return_type = p->warn_about_return_type;
6498 current_extern_inline = p->extern_inline;
6503 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6506 c_dup_lang_specific_decl (tree decl)
6508 struct lang_decl *ld;
6510 if (!DECL_LANG_SPECIFIC (decl))
6513 ld = GGC_NEW (struct lang_decl);
6514 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6515 DECL_LANG_SPECIFIC (decl) = ld;
6518 /* The functions below are required for functionality of doing
6519 function at once processing in the C front end. Currently these
6520 functions are not called from anywhere in the C front end, but as
6521 these changes continue, that will change. */
6523 /* Returns nonzero if the current statement is a full expression,
6524 i.e. temporaries created during that statement should be destroyed
6525 at the end of the statement. */
6528 stmts_are_full_exprs_p (void)
6533 /* Returns the stmt_tree (if any) to which statements are currently
6534 being added. If there is no active statement-tree, NULL is
6538 current_stmt_tree (void)
6540 return &c_stmt_tree;
6543 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6547 anon_aggr_type_p (tree ARG_UNUSED (node))
6552 /* Return the global value of T as a symbol. */
6555 identifier_global_value (tree t)
6557 struct c_binding *b;
6559 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6560 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6566 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6567 otherwise the name is found in ridpointers from RID_INDEX. */
6570 record_builtin_type (enum rid rid_index, const char *name, tree type)
6574 id = ridpointers[(int) rid_index];
6576 id = get_identifier (name);
6577 decl = build_decl (TYPE_DECL, id, type);
6579 if (debug_hooks->type_decl)
6580 debug_hooks->type_decl (decl, false);
6583 /* Build the void_list_node (void_type_node having been created). */
6585 build_void_list_node (void)
6587 tree t = build_tree_list (NULL_TREE, void_type_node);
6591 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6594 build_c_parm (struct c_declspecs *specs, tree attrs,
6595 struct c_declarator *declarator)
6597 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6600 ret->declarator = declarator;
6604 /* Return a declarator with nested attributes. TARGET is the inner
6605 declarator to which these attributes apply. ATTRS are the
6608 struct c_declarator *
6609 build_attrs_declarator (tree attrs, struct c_declarator *target)
6611 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6612 ret->kind = cdk_attrs;
6613 ret->declarator = target;
6614 ret->u.attrs = attrs;
6618 /* Return a declarator for a function with arguments specified by ARGS
6619 and return type specified by TARGET. */
6621 struct c_declarator *
6622 build_function_declarator (struct c_arg_info *args,
6623 struct c_declarator *target)
6625 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6626 ret->kind = cdk_function;
6627 ret->declarator = target;
6628 ret->u.arg_info = args;
6632 /* Return a declarator for the identifier IDENT (which may be
6633 NULL_TREE for an abstract declarator). */
6635 struct c_declarator *
6636 build_id_declarator (tree ident)
6638 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6640 ret->declarator = 0;
6645 /* Return something to represent absolute declarators containing a *.
6646 TARGET is the absolute declarator that the * contains.
6647 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6648 to apply to the pointer type. */
6650 struct c_declarator *
6651 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6652 struct c_declarator *target)
6656 struct c_declarator *itarget = target;
6657 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6658 if (type_quals_attrs)
6660 attrs = type_quals_attrs->attrs;
6661 quals = quals_from_declspecs (type_quals_attrs);
6662 if (attrs != NULL_TREE)
6663 itarget = build_attrs_declarator (attrs, target);
6665 ret->kind = cdk_pointer;
6666 ret->declarator = itarget;
6667 ret->u.pointer_quals = quals;
6671 /* Return a pointer to a structure for an empty list of declaration
6674 struct c_declspecs *
6675 build_null_declspecs (void)
6677 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6681 ret->typespec_word = cts_none;
6682 ret->storage_class = csc_none;
6683 ret->non_sc_seen_p = false;
6684 ret->typedef_p = false;
6685 ret->tag_defined_p = false;
6686 ret->explicit_signed_p = false;
6687 ret->deprecated_p = false;
6688 ret->default_int_p = false;
6689 ret->long_p = false;
6690 ret->long_long_p = false;
6691 ret->short_p = false;
6692 ret->signed_p = false;
6693 ret->unsigned_p = false;
6694 ret->complex_p = false;
6695 ret->inline_p = false;
6696 ret->thread_p = false;
6697 ret->const_p = false;
6698 ret->volatile_p = false;
6699 ret->restrict_p = false;
6703 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6706 struct c_declspecs *
6707 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6711 specs->non_sc_seen_p = true;
6712 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6713 && C_IS_RESERVED_WORD (qual));
6714 i = C_RID_CODE (qual);
6718 dupe = specs->const_p;
6719 specs->const_p = true;
6722 dupe = specs->volatile_p;
6723 specs->volatile_p = true;
6726 dupe = specs->restrict_p;
6727 specs->restrict_p = true;
6732 if (dupe && pedantic && !flag_isoc99)
6733 pedwarn ("duplicate %qs", IDENTIFIER_POINTER (qual));
6737 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6740 struct c_declspecs *
6741 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
6743 tree type = spec.spec;
6744 specs->non_sc_seen_p = true;
6745 if (TREE_DEPRECATED (type))
6746 specs->deprecated_p = true;
6748 /* Handle type specifier keywords. */
6749 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
6751 enum rid i = C_RID_CODE (type);
6754 error ("two or more data types in declaration specifiers");
6757 if ((int) i <= (int) RID_LAST_MODIFIER)
6759 /* "long", "short", "signed", "unsigned" or "_Complex". */
6764 if (specs->long_long_p)
6766 error ("%<long long long%> is too long for GCC");
6771 if (specs->typespec_word == cts_double)
6773 error ("both %<long long%> and %<double%> in "
6774 "declaration specifiers");
6777 if (pedantic && !flag_isoc99 && !in_system_header
6779 pedwarn ("ISO C90 does not support %<long long%>");
6780 specs->long_long_p = 1;
6784 error ("both %<long%> and %<short%> in "
6785 "declaration specifiers");
6786 else if (specs->typespec_word == cts_void)
6787 error ("both %<long%> and %<void%> in "
6788 "declaration specifiers");
6789 else if (specs->typespec_word == cts_bool)
6790 error ("both %<long%> and %<_Bool%> in "
6791 "declaration specifiers");
6792 else if (specs->typespec_word == cts_char)
6793 error ("both %<long%> and %<char%> in "
6794 "declaration specifiers");
6795 else if (specs->typespec_word == cts_float)
6796 error ("both %<long%> and %<float%> in "
6797 "declaration specifiers");
6799 specs->long_p = true;
6802 dupe = specs->short_p;
6804 error ("both %<long%> and %<short%> in "
6805 "declaration specifiers");
6806 else if (specs->typespec_word == cts_void)
6807 error ("both %<short%> and %<void%> in "
6808 "declaration specifiers");
6809 else if (specs->typespec_word == cts_bool)
6810 error ("both %<short%> and %<_Bool%> in "
6811 "declaration specifiers");
6812 else if (specs->typespec_word == cts_char)
6813 error ("both %<short%> and %<char%> in "
6814 "declaration specifiers");
6815 else if (specs->typespec_word == cts_float)
6816 error ("both %<short%> and %<float%> in "
6817 "declaration specifiers");
6818 else if (specs->typespec_word == cts_double)
6819 error ("both %<short%> and %<double%> in "
6820 "declaration specifiers");
6822 specs->short_p = true;
6825 dupe = specs->signed_p;
6826 if (specs->unsigned_p)
6827 error ("both %<signed%> and %<unsigned%> in "
6828 "declaration specifiers");
6829 else if (specs->typespec_word == cts_void)
6830 error ("both %<signed%> and %<void%> in "
6831 "declaration specifiers");
6832 else if (specs->typespec_word == cts_bool)
6833 error ("both %<signed%> and %<_Bool%> in "
6834 "declaration specifiers");
6835 else if (specs->typespec_word == cts_float)
6836 error ("both %<signed%> and %<float%> in "
6837 "declaration specifiers");
6838 else if (specs->typespec_word == cts_double)
6839 error ("both %<signed%> and %<double%> in "
6840 "declaration specifiers");
6842 specs->signed_p = true;
6845 dupe = specs->unsigned_p;
6846 if (specs->signed_p)
6847 error ("both %<signed%> and %<unsigned%> in "
6848 "declaration specifiers");
6849 else if (specs->typespec_word == cts_void)
6850 error ("both %<unsigned%> and %<void%> in "
6851 "declaration specifiers");
6852 else if (specs->typespec_word == cts_bool)
6853 error ("both %<unsigned%> and %<_Bool%> in "
6854 "declaration specifiers");
6855 else if (specs->typespec_word == cts_float)
6856 error ("both %<unsigned%> and %<float%> in "
6857 "declaration specifiers");
6858 else if (specs->typespec_word == cts_double)
6859 error ("both %<unsigned%> and %<double%> in "
6860 "declaration specifiers");
6862 specs->unsigned_p = true;
6865 dupe = specs->complex_p;
6866 if (pedantic && !flag_isoc99 && !in_system_header)
6867 pedwarn ("ISO C90 does not support complex types");
6868 if (specs->typespec_word == cts_void)
6869 error ("both %<complex%> and %<void%> in "
6870 "declaration specifiers");
6871 else if (specs->typespec_word == cts_bool)
6872 error ("both %<complex%> and %<_Bool%> in "
6873 "declaration specifiers");
6875 specs->complex_p = true;
6882 error ("duplicate %qs", IDENTIFIER_POINTER (type));
6888 /* "void", "_Bool", "char", "int", "float" or "double". */
6889 if (specs->typespec_word != cts_none)
6891 error ("two or more data types in declaration specifiers");
6898 error ("both %<long%> and %<void%> in "
6899 "declaration specifiers");
6900 else if (specs->short_p)
6901 error ("both %<short%> and %<void%> in "
6902 "declaration specifiers");
6903 else if (specs->signed_p)
6904 error ("both %<signed%> and %<void%> in "
6905 "declaration specifiers");
6906 else if (specs->unsigned_p)
6907 error ("both %<unsigned%> and %<void%> in "
6908 "declaration specifiers");
6909 else if (specs->complex_p)
6910 error ("both %<complex%> and %<void%> in "
6911 "declaration specifiers");
6913 specs->typespec_word = cts_void;
6917 error ("both %<long%> and %<_Bool%> in "
6918 "declaration specifiers");
6919 else if (specs->short_p)
6920 error ("both %<short%> and %<_Bool%> in "
6921 "declaration specifiers");
6922 else if (specs->signed_p)
6923 error ("both %<signed%> and %<_Bool%> in "
6924 "declaration specifiers");
6925 else if (specs->unsigned_p)
6926 error ("both %<unsigned%> and %<_Bool%> in "
6927 "declaration specifiers");
6928 else if (specs->complex_p)
6929 error ("both %<complex%> and %<_Bool%> in "
6930 "declaration specifiers");
6932 specs->typespec_word = cts_bool;
6936 error ("both %<long%> and %<char%> in "
6937 "declaration specifiers");
6938 else if (specs->short_p)
6939 error ("both %<short%> and %<char%> in "
6940 "declaration specifiers");
6942 specs->typespec_word = cts_char;
6945 specs->typespec_word = cts_int;
6949 error ("both %<long%> and %<float%> in "
6950 "declaration specifiers");
6951 else if (specs->short_p)
6952 error ("both %<short%> and %<float%> in "
6953 "declaration specifiers");
6954 else if (specs->signed_p)
6955 error ("both %<signed%> and %<float%> in "
6956 "declaration specifiers");
6957 else if (specs->unsigned_p)
6958 error ("both %<unsigned%> and %<float%> in "
6959 "declaration specifiers");
6961 specs->typespec_word = cts_float;
6964 if (specs->long_long_p)
6965 error ("both %<long long%> and %<double%> in "
6966 "declaration specifiers");
6967 else if (specs->short_p)
6968 error ("both %<short%> and %<double%> in "
6969 "declaration specifiers");
6970 else if (specs->signed_p)
6971 error ("both %<signed%> and %<double%> in "
6972 "declaration specifiers");
6973 else if (specs->unsigned_p)
6974 error ("both %<unsigned%> and %<double%> in "
6975 "declaration specifiers");
6977 specs->typespec_word = cts_double;
6980 /* ObjC reserved word "id", handled below. */
6986 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
6987 form of ObjC type, cases such as "int" and "long" being handled
6988 above), a TYPE (struct, union, enum and typeof specifiers) or an
6989 ERROR_MARK. In none of these cases may there have previously
6990 been any type specifiers. */
6991 if (specs->type || specs->typespec_word != cts_none
6992 || specs->long_p || specs->short_p || specs->signed_p
6993 || specs->unsigned_p || specs->complex_p)
6994 error ("two or more data types in declaration specifiers");
6995 else if (TREE_CODE (type) == TYPE_DECL)
6997 if (TREE_TYPE (type) == error_mark_node)
6998 ; /* Allow the type to default to int to avoid cascading errors. */
7001 specs->type = TREE_TYPE (type);
7002 specs->decl_attr = DECL_ATTRIBUTES (type);
7003 specs->typedef_p = true;
7004 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7007 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7009 tree t = lookup_name (type);
7010 if (!t || TREE_CODE (t) != TYPE_DECL)
7011 error ("%qs fails to be a typedef or built in type",
7012 IDENTIFIER_POINTER (type));
7013 else if (TREE_TYPE (t) == error_mark_node)
7016 specs->type = TREE_TYPE (t);
7018 else if (TREE_CODE (type) != ERROR_MARK)
7020 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7021 specs->tag_defined_p = true;
7022 if (spec.kind == ctsk_typeof)
7023 specs->typedef_p = true;
7030 /* Add the storage class specifier or function specifier SCSPEC to the
7031 declaration specifiers SPECS, returning SPECS. */
7033 struct c_declspecs *
7034 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7037 enum c_storage_class n = csc_none;
7039 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7040 && C_IS_RESERVED_WORD (scspec));
7041 i = C_RID_CODE (scspec);
7042 if (extra_warnings && specs->non_sc_seen_p)
7043 warning ("%qs is not at beginning of declaration",
7044 IDENTIFIER_POINTER (scspec));
7048 /* C99 permits duplicate inline. Although of doubtful utility,
7049 it seems simplest to permit it in gnu89 mode as well, as
7050 there is also little utility in maintaining this as a
7051 difference between gnu89 and C99 inline. */
7053 specs->inline_p = true;
7056 dupe = specs->thread_p;
7057 if (specs->storage_class == csc_auto)
7058 error ("%<__thread%> used with %<auto%>");
7059 else if (specs->storage_class == csc_register)
7060 error ("%<__thread%> used with %<register%>");
7061 else if (specs->storage_class == csc_typedef)
7062 error ("%<__thread%> used with %<typedef%>");
7064 specs->thread_p = true;
7071 /* Diagnose "__thread extern". */
7072 if (specs->thread_p)
7073 error ("%<__thread%> before %<extern%>");
7080 /* Diagnose "__thread static". */
7081 if (specs->thread_p)
7082 error ("%<__thread%> before %<static%>");
7090 if (n != csc_none && n == specs->storage_class)
7093 error ("duplicate %qs", IDENTIFIER_POINTER (scspec));
7096 if (specs->storage_class != csc_none && n != specs->storage_class)
7098 error ("multiple storage classes in declaration specifiers");
7102 specs->storage_class = n;
7103 if (n != csc_extern && n != csc_static && specs->thread_p)
7105 error ("%<__thread%> used with %qs",
7106 IDENTIFIER_POINTER (scspec));
7107 specs->thread_p = false;
7114 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7117 struct c_declspecs *
7118 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7120 specs->attrs = chainon (attrs, specs->attrs);
7124 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7125 specifiers with any other type specifier to determine the resulting
7126 type. This is where ISO C checks on complex types are made, since
7127 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7130 struct c_declspecs *
7131 finish_declspecs (struct c_declspecs *specs)
7133 /* If a type was specified as a whole, we have no modifiers and are
7135 if (specs->type != NULL_TREE)
7137 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7138 && !specs->signed_p && !specs->unsigned_p
7139 && !specs->complex_p);
7143 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7144 has been specified, treat it as "int" unless "_Complex" is
7145 present and there are no other specifiers. If we just have
7146 "_Complex", it is equivalent to "_Complex double", but e.g.
7147 "_Complex short" is equivalent to "_Complex short int". */
7148 if (specs->typespec_word == cts_none)
7150 if (specs->long_p || specs->short_p
7151 || specs->signed_p || specs->unsigned_p)
7153 specs->typespec_word = cts_int;
7155 else if (specs->complex_p)
7157 specs->typespec_word = cts_double;
7159 pedwarn ("ISO C does not support plain %<complex%> meaning "
7160 "%<double complex%>");
7164 specs->typespec_word = cts_int;
7165 specs->default_int_p = true;
7166 /* We don't diagnose this here because grokdeclarator will
7167 give more specific diagnostics according to whether it is
7168 a function definition. */
7172 /* If "signed" was specified, record this to distinguish "int" and
7173 "signed int" in the case of a bit-field with
7174 -funsigned-bitfields. */
7175 specs->explicit_signed_p = specs->signed_p;
7177 /* Now compute the actual type. */
7178 switch (specs->typespec_word)
7181 gcc_assert (!specs->long_p && !specs->short_p
7182 && !specs->signed_p && !specs->unsigned_p
7183 && !specs->complex_p);
7184 specs->type = void_type_node;
7187 gcc_assert (!specs->long_p && !specs->short_p
7188 && !specs->signed_p && !specs->unsigned_p
7189 && !specs->complex_p);
7190 specs->type = boolean_type_node;
7193 gcc_assert (!specs->long_p && !specs->short_p);
7194 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7195 if (specs->signed_p)
7196 specs->type = signed_char_type_node;
7197 else if (specs->unsigned_p)
7198 specs->type = unsigned_char_type_node;
7200 specs->type = char_type_node;
7201 if (specs->complex_p)
7204 pedwarn ("ISO C does not support complex integer types");
7205 specs->type = build_complex_type (specs->type);
7209 gcc_assert (!(specs->long_p && specs->short_p));
7210 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7211 if (specs->long_long_p)
7212 specs->type = (specs->unsigned_p
7213 ? long_long_unsigned_type_node
7214 : long_long_integer_type_node);
7215 else if (specs->long_p)
7216 specs->type = (specs->unsigned_p
7217 ? long_unsigned_type_node
7218 : long_integer_type_node);
7219 else if (specs->short_p)
7220 specs->type = (specs->unsigned_p
7221 ? short_unsigned_type_node
7222 : short_integer_type_node);
7224 specs->type = (specs->unsigned_p
7225 ? unsigned_type_node
7226 : integer_type_node);
7227 if (specs->complex_p)
7230 pedwarn ("ISO C does not support complex integer types");
7231 specs->type = build_complex_type (specs->type);
7235 gcc_assert (!specs->long_p && !specs->short_p
7236 && !specs->signed_p && !specs->unsigned_p);
7237 specs->type = (specs->complex_p
7238 ? complex_float_type_node
7242 gcc_assert (!specs->long_long_p && !specs->short_p
7243 && !specs->signed_p && !specs->unsigned_p);
7246 specs->type = (specs->complex_p
7247 ? complex_long_double_type_node
7248 : long_double_type_node);
7252 specs->type = (specs->complex_p
7253 ? complex_double_type_node
7254 : double_type_node);
7264 /* Synthesize a function which calls all the global ctors or global
7265 dtors in this file. This is only used for targets which do not
7266 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7268 build_cdtor (int method_type, tree cdtors)
7275 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7276 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7279 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7282 /* Perform final processing on one file scope's declarations (or the
7283 external scope's declarations), GLOBALS. */
7285 c_write_global_declarations_1 (tree globals)
7287 size_t len = list_length (globals);
7288 tree *vec = XNEWVEC (tree, len);
7292 /* Process the decls in the order they were written. */
7293 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
7296 /* Check for used but undefined static functions using the C
7297 standard's definition of "used", and set TREE_NO_WARNING so
7298 that check_global_declarations doesn't repeat the check. */
7299 if (TREE_CODE (decl) == FUNCTION_DECL
7300 && DECL_INITIAL (decl) == 0
7301 && DECL_EXTERNAL (decl)
7302 && !TREE_PUBLIC (decl)
7303 && C_DECL_USED (decl))
7305 pedwarn ("%J%qF used but never defined", decl, decl);
7306 TREE_NO_WARNING (decl) = 1;
7310 wrapup_global_declarations (vec, len);
7311 check_global_declarations (vec, len);
7317 c_write_global_declarations (void)
7321 /* We don't want to do this if generating a PCH. */
7325 /* Don't waste time on further processing if -fsyntax-only or we've
7326 encountered errors. */
7327 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7330 /* Close the external scope. */
7331 ext_block = pop_scope ();
7333 gcc_assert (!current_scope);
7335 /* Process all file scopes in this compilation, and the external_scope,
7336 through wrapup_global_declarations and check_global_declarations. */
7337 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7338 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7339 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7341 /* Generate functions to call static constructors and destructors
7342 for targets that do not support .ctors/.dtors sections. These
7343 functions have magic names which are detected by collect2. */
7344 build_cdtor ('I', static_ctors); static_ctors = 0;
7345 build_cdtor ('D', static_dtors); static_dtors = 0;
7347 /* We're done parsing; proceed to optimize and emit assembly.
7348 FIXME: shouldn't be the front end's responsibility to call this. */
7352 #include "gt-c-decl.h"