1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
35 #include "tree-inline.h"
52 #include "langhooks.h"
53 #include "tree-mudflap.h"
54 #include "tree-gimple.h"
55 #include "diagnostic.h"
56 #include "tree-dump.h"
61 #include "langhooks-def.h"
63 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
65 { NORMAL, /* Ordinary declaration */
66 FUNCDEF, /* Function definition */
67 PARM, /* Declaration of parm before function body */
68 FIELD, /* Declaration inside struct or union */
69 TYPENAME}; /* Typename (inside cast or sizeof) */
72 /* Nonzero if we have seen an invalid cross reference
73 to a struct, union, or enum, but not yet printed the message. */
74 tree pending_invalid_xref;
76 /* File and line to appear in the eventual error message. */
77 location_t pending_invalid_xref_location;
79 /* True means we've initialized exception handling. */
80 bool c_eh_initialized_p;
82 /* While defining an enum type, this is 1 plus the last enumerator
83 constant value. Note that will do not have to save this or `enum_overflow'
84 around nested function definition since such a definition could only
85 occur in an enum value expression and we don't use these variables in
88 static tree enum_next_value;
90 /* Nonzero means that there was overflow computing enum_next_value. */
92 static int enum_overflow;
94 /* The file and line that the prototype came from if this is an
95 old-style definition; used for diagnostics in
96 store_parm_decls_oldstyle. */
98 static location_t current_function_prototype_locus;
100 /* The argument information structure for the function currently being
103 static struct c_arg_info *current_function_arg_info;
105 /* The obstack on which parser and related data structures, which are
106 not live beyond their top-level declaration or definition, are
108 struct obstack parser_obstack;
110 /* The current statement tree. */
112 static GTY(()) struct stmt_tree_s c_stmt_tree;
114 /* State saving variables. */
118 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
119 included in this invocation. Note that the current translation
120 unit is not included in this list. */
122 static GTY(()) tree all_translation_units;
124 /* A list of decls to be made automatically visible in each file scope. */
125 static GTY(()) tree visible_builtins;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a call to a noreturn function is seen. */
140 int current_function_returns_abnormally;
142 /* Set to nonzero by `grokdeclarator' for a function
143 whose return type is defaulted, if warnings for this are desired. */
145 static int warn_about_return_type;
147 /* Nonzero when starting a function declared `extern inline'. */
149 static int current_extern_inline;
151 /* True means global_bindings_p should return false even if the scope stack
152 says we are in file scope. */
153 bool c_override_global_bindings_to_false;
156 /* Each c_binding structure describes one binding of an identifier to
157 a decl. All the decls in a scope - irrespective of namespace - are
158 chained together by the ->prev field, which (as the name implies)
159 runs in reverse order. All the decls in a given namespace bound to
160 a given identifier are chained by the ->shadowed field, which runs
161 from inner to outer scopes.
163 The ->decl field usually points to a DECL node, but there are two
164 exceptions. In the namespace of type tags, the bound entity is a
165 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
166 identifier is encountered, it is bound to error_mark_node to
167 suppress further errors about that identifier in the current
170 The ->type field stores the type of the declaration in this scope;
171 if NULL, the type is the type of the ->decl field. This is only of
172 relevance for objects with external or internal linkage which may
173 be redeclared in inner scopes, forming composite types that only
174 persist for the duration of those scopes. In the external scope,
175 this stores the composite of all the types declared for this
176 object, visible or not. The ->inner_comp field (used only at file
177 scope) stores whether an incomplete array type at file scope was
178 completed at an inner scope to an array size other than 1.
180 The depth field is copied from the scope structure that holds this
181 decl. It is used to preserve the proper ordering of the ->shadowed
182 field (see bind()) and also for a handful of special-case checks.
183 Finally, the invisible bit is true for a decl which should be
184 ignored for purposes of normal name lookup, and the nested bit is
185 true for a decl that's been bound a second time in an inner scope;
186 in all such cases, the binding in the outer scope will have its
187 invisible bit true. */
189 struct c_binding GTY((chain_next ("%h.prev")))
191 tree decl; /* the decl bound */
192 tree type; /* the type in this scope */
193 tree id; /* the identifier it's bound to */
194 struct c_binding *prev; /* the previous decl in this scope */
195 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
196 unsigned int depth : 28; /* depth of this scope */
197 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
198 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
199 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
202 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
203 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
204 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
205 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
207 #define I_SYMBOL_BINDING(node) \
208 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->symbol_binding)
209 #define I_SYMBOL_DECL(node) \
210 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
212 #define I_TAG_BINDING(node) \
213 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->tag_binding)
214 #define I_TAG_DECL(node) \
215 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
217 #define I_LABEL_BINDING(node) \
218 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->label_binding)
219 #define I_LABEL_DECL(node) \
220 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
222 /* Each C symbol points to three linked lists of c_binding structures.
223 These describe the values of the identifier in the three different
224 namespaces defined by the language. */
226 struct lang_identifier GTY(())
228 struct c_common_identifier common_id;
229 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
230 struct c_binding *tag_binding; /* struct/union/enum tags */
231 struct c_binding *label_binding; /* labels */
234 /* Validate c-lang.c's assumptions. */
235 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
236 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
238 /* The resulting tree type. */
241 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
242 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *)TYPE_NEXT_VARIANT (&%h.generic) : (union lang_tree_node *)TREE_CHAIN (&%h.generic)")))
244 union tree_node GTY ((tag ("0"),
245 desc ("tree_node_structure (&%h)")))
247 struct lang_identifier GTY ((tag ("1"))) identifier;
250 /* Each c_scope structure describes the complete contents of one
251 scope. Four scopes are distinguished specially: the innermost or
252 current scope, the innermost function scope, the file scope (always
253 the second to outermost) and the outermost or external scope.
255 Most declarations are recorded in the current scope.
257 All normal label declarations are recorded in the innermost
258 function scope, as are bindings of undeclared identifiers to
259 error_mark_node. (GCC permits nested functions as an extension,
260 hence the 'innermost' qualifier.) Explicitly declared labels
261 (using the __label__ extension) appear in the current scope.
263 Being in the file scope (current_scope == file_scope) causes
264 special behavior in several places below. Also, under some
265 conditions the Objective-C front end records declarations in the
266 file scope even though that isn't the current scope.
268 All declarations with external linkage are recorded in the external
269 scope, even if they aren't visible there; this models the fact that
270 such declarations are visible to the entire program, and (with a
271 bit of cleverness, see pushdecl) allows diagnosis of some violations
272 of C99 6.2.2p7 and 6.2.7p2:
274 If, within the same translation unit, the same identifier appears
275 with both internal and external linkage, the behavior is
278 All declarations that refer to the same object or function shall
279 have compatible type; otherwise, the behavior is undefined.
281 Initially only the built-in declarations, which describe compiler
282 intrinsic functions plus a subset of the standard library, are in
285 The order of the blocks list matters, and it is frequently appended
286 to. To avoid having to walk all the way to the end of the list on
287 each insertion, or reverse the list later, we maintain a pointer to
288 the last list entry. (FIXME: It should be feasible to use a reversed
291 The bindings list is strictly in reverse order of declarations;
292 pop_scope relies on this. */
295 struct c_scope GTY((chain_next ("%h.outer")))
297 /* The scope containing this one. */
298 struct c_scope *outer;
300 /* The next outermost function scope. */
301 struct c_scope *outer_function;
303 /* All bindings in this scope. */
304 struct c_binding *bindings;
306 /* For each scope (except the global one), a chain of BLOCK nodes
307 for all the scopes that were entered and exited one level down. */
311 /* The depth of this scope. Used to keep the ->shadowed chain of
312 bindings sorted innermost to outermost. */
313 unsigned int depth : 28;
315 /* True if we are currently filling this scope with parameter
317 BOOL_BITFIELD parm_flag : 1;
319 /* True if we already complained about forward parameter decls
320 in this scope. This prevents double warnings on
321 foo (int a; int b; ...) */
322 BOOL_BITFIELD warned_forward_parm_decls : 1;
324 /* True if this is the outermost block scope of a function body.
325 This scope contains the parameters, the local variables declared
326 in the outermost block, and all the labels (except those in
327 nested functions, or declared at block scope with __label__). */
328 BOOL_BITFIELD function_body : 1;
330 /* True means make a BLOCK for this scope no matter what. */
331 BOOL_BITFIELD keep : 1;
334 /* The scope currently in effect. */
336 static GTY(()) struct c_scope *current_scope;
338 /* The innermost function scope. Ordinary (not explicitly declared)
339 labels, bindings to error_mark_node, and the lazily-created
340 bindings of __func__ and its friends get this scope. */
342 static GTY(()) struct c_scope *current_function_scope;
344 /* The C file scope. This is reset for each input translation unit. */
346 static GTY(()) struct c_scope *file_scope;
348 /* The outermost scope. This is used for all declarations with
349 external linkage, and only these, hence the name. */
351 static GTY(()) struct c_scope *external_scope;
353 /* A chain of c_scope structures awaiting reuse. */
355 static GTY((deletable)) struct c_scope *scope_freelist;
357 /* A chain of c_binding structures awaiting reuse. */
359 static GTY((deletable)) struct c_binding *binding_freelist;
361 /* Append VAR to LIST in scope SCOPE. */
362 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
363 struct c_scope *s_ = (scope); \
365 if (s_->list##_last) \
366 TREE_CHAIN (s_->list##_last) = d_; \
369 s_->list##_last = d_; \
372 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
373 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
374 struct c_scope *t_ = (tscope); \
375 struct c_scope *f_ = (fscope); \
377 TREE_CHAIN (t_->to##_last) = f_->from; \
380 t_->to##_last = f_->from##_last; \
383 /* True means unconditionally make a BLOCK for the next scope pushed. */
385 static bool keep_next_level_flag;
387 /* True means the next call to push_scope will be the outermost scope
388 of a function body, so do not push a new scope, merely cease
389 expecting parameter decls. */
391 static bool next_is_function_body;
393 /* Functions called automatically at the beginning and end of execution. */
395 static GTY(()) tree static_ctors;
396 static GTY(()) tree static_dtors;
398 /* Forward declarations. */
399 static tree lookup_name_in_scope (tree, struct c_scope *);
400 static tree c_make_fname_decl (tree, int);
401 static tree grokdeclarator (const struct c_declarator *,
402 struct c_declspecs *,
403 enum decl_context, bool, tree *);
404 static tree grokparms (struct c_arg_info *, bool);
405 static void layout_array_type (tree);
407 /* States indicating how grokdeclarator() should handle declspecs marked
408 with __attribute__((deprecated)). An object declared as
409 __attribute__((deprecated)) suppresses warnings of uses of other
412 enum deprecated_states {
417 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
420 c_print_identifier (FILE *file, tree node, int indent)
422 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
423 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
424 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
425 if (C_IS_RESERVED_WORD (node))
427 tree rid = ridpointers[C_RID_CODE (node)];
428 indent_to (file, indent + 4);
429 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
430 (void *) rid, IDENTIFIER_POINTER (rid));
434 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
435 which may be any of several kinds of DECL or TYPE or error_mark_node,
436 in the scope SCOPE. */
438 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
440 struct c_binding *b, **here;
442 if (binding_freelist)
444 b = binding_freelist;
445 binding_freelist = b->prev;
448 b = GGC_NEW (struct c_binding);
453 b->depth = scope->depth;
454 b->invisible = invisible;
460 b->prev = scope->bindings;
466 switch (TREE_CODE (decl))
468 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
471 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
477 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
483 /* Locate the appropriate place in the chain of shadowed decls
484 to insert this binding. Normally, scope == current_scope and
485 this does nothing. */
486 while (*here && (*here)->depth > scope->depth)
487 here = &(*here)->shadowed;
493 /* Clear the binding structure B, stick it on the binding_freelist,
494 and return the former value of b->prev. This is used by pop_scope
495 and get_parm_info to iterate destructively over all the bindings
496 from a given scope. */
497 static struct c_binding *
498 free_binding_and_advance (struct c_binding *b)
500 struct c_binding *prev = b->prev;
502 memset (b, 0, sizeof (struct c_binding));
503 b->prev = binding_freelist;
504 binding_freelist = b;
510 /* Hook called at end of compilation to assume 1 elt
511 for a file-scope tentative array defn that wasn't complete before. */
514 c_finish_incomplete_decl (tree decl)
516 if (TREE_CODE (decl) == VAR_DECL)
518 tree type = TREE_TYPE (decl);
519 if (type != error_mark_node
520 && TREE_CODE (type) == ARRAY_TYPE
521 && ! DECL_EXTERNAL (decl)
522 && TYPE_DOMAIN (type) == 0)
524 warning ("%Jarray '%D' assumed to have one element", decl, decl);
526 complete_array_type (type, NULL_TREE, 1);
528 layout_decl (decl, 0);
533 /* The Objective-C front-end often needs to determine the current scope. */
536 objc_get_current_scope (void)
538 return current_scope;
541 /* The following function is used only by Objective-C. It needs to live here
542 because it accesses the innards of c_scope. */
545 objc_mark_locals_volatile (void *enclosing_blk)
547 struct c_scope *scope;
550 for (scope = current_scope;
551 scope && scope != enclosing_blk;
552 scope = scope->outer)
554 for (b = scope->bindings; b; b = b->prev)
556 if (TREE_CODE (b->decl) == VAR_DECL
557 || TREE_CODE (b->decl) == PARM_DECL)
559 C_DECL_REGISTER (b->decl) = 0;
560 DECL_REGISTER (b->decl) = 0;
561 TREE_THIS_VOLATILE (b->decl) = 1;
565 /* Do not climb up past the current function. */
566 if (scope->function_body)
571 /* Nonzero if we are currently in file scope. */
574 global_bindings_p (void)
576 return current_scope == file_scope && !c_override_global_bindings_to_false;
580 keep_next_level (void)
582 keep_next_level_flag = true;
585 /* Identify this scope as currently being filled with parameters. */
588 declare_parm_level (void)
590 current_scope->parm_flag = true;
596 if (next_is_function_body)
598 /* This is the transition from the parameters to the top level
599 of the function body. These are the same scope
600 (C99 6.2.1p4,6) so we do not push another scope structure.
601 next_is_function_body is set only by store_parm_decls, which
602 in turn is called when and only when we are about to
603 encounter the opening curly brace for the function body.
605 The outermost block of a function always gets a BLOCK node,
606 because the debugging output routines expect that each
607 function has at least one BLOCK. */
608 current_scope->parm_flag = false;
609 current_scope->function_body = true;
610 current_scope->keep = true;
611 current_scope->outer_function = current_function_scope;
612 current_function_scope = current_scope;
614 keep_next_level_flag = false;
615 next_is_function_body = false;
619 struct c_scope *scope;
622 scope = scope_freelist;
623 scope_freelist = scope->outer;
626 scope = GGC_CNEW (struct c_scope);
628 scope->keep = keep_next_level_flag;
629 scope->outer = current_scope;
630 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
632 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
634 if (current_scope && scope->depth == 0)
637 sorry ("GCC supports only %u nested scopes\n", scope->depth);
640 current_scope = scope;
641 keep_next_level_flag = false;
645 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
648 set_type_context (tree type, tree context)
650 for (type = TYPE_MAIN_VARIANT (type); type;
651 type = TYPE_NEXT_VARIANT (type))
652 TYPE_CONTEXT (type) = context;
655 /* Exit a scope. Restore the state of the identifier-decl mappings
656 that were in effect when this scope was entered. Return a BLOCK
657 node containing all the DECLs in this scope that are of interest
658 to debug info generation. */
663 struct c_scope *scope = current_scope;
664 tree block, context, p;
667 bool functionbody = scope->function_body;
668 bool keep = functionbody || scope->keep || scope->bindings;
670 /* If appropriate, create a BLOCK to record the decls for the life
675 block = make_node (BLOCK);
676 BLOCK_SUBBLOCKS (block) = scope->blocks;
677 TREE_USED (block) = 1;
679 /* In each subblock, record that this is its superior. */
680 for (p = scope->blocks; p; p = TREE_CHAIN (p))
681 BLOCK_SUPERCONTEXT (p) = block;
683 BLOCK_VARS (block) = 0;
686 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
687 scope must be set so that they point to the appropriate
688 construct, i.e. either to the current FUNCTION_DECL node, or
689 else to the BLOCK node we just constructed.
691 Note that for tagged types whose scope is just the formal
692 parameter list for some function type specification, we can't
693 properly set their TYPE_CONTEXTs here, because we don't have a
694 pointer to the appropriate FUNCTION_TYPE node readily available
695 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
696 type nodes get set in `grokdeclarator' as soon as we have created
697 the FUNCTION_TYPE node which will represent the "scope" for these
698 "parameter list local" tagged types. */
699 if (scope->function_body)
700 context = current_function_decl;
701 else if (scope == file_scope)
703 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
704 TREE_CHAIN (file_decl) = all_translation_units;
705 all_translation_units = file_decl;
711 /* Clear all bindings in this scope. */
712 for (b = scope->bindings; b; b = free_binding_and_advance (b))
715 switch (TREE_CODE (p))
718 /* Warnings for unused labels, errors for undefined labels. */
719 if (TREE_USED (p) && !DECL_INITIAL (p))
721 error ("%Jlabel `%D' used but not defined", p, p);
722 DECL_INITIAL (p) = error_mark_node;
724 else if (!TREE_USED (p) && warn_unused_label)
726 if (DECL_INITIAL (p))
727 warning ("%Jlabel `%D' defined but not used", p, p);
729 warning ("%Jlabel `%D' declared but not defined", p, p);
731 /* Labels go in BLOCK_VARS. */
732 TREE_CHAIN (p) = BLOCK_VARS (block);
733 BLOCK_VARS (block) = p;
734 gcc_assert (I_LABEL_BINDING (b->id) == b);
735 I_LABEL_BINDING (b->id) = b->shadowed;
741 set_type_context (p, context);
743 /* Types may not have tag-names, in which case the type
744 appears in the bindings list with b->id NULL. */
747 gcc_assert (I_TAG_BINDING (b->id) == b);
748 I_TAG_BINDING (b->id) = b->shadowed;
753 /* Propagate TREE_ADDRESSABLE from nested functions to their
754 containing functions. */
755 if (! TREE_ASM_WRITTEN (p)
756 && DECL_INITIAL (p) != 0
757 && TREE_ADDRESSABLE (p)
758 && DECL_ABSTRACT_ORIGIN (p) != 0
759 && DECL_ABSTRACT_ORIGIN (p) != p)
760 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
764 /* Warnings for unused variables. */
765 if (warn_unused_variable
767 && !DECL_IN_SYSTEM_HEADER (p)
769 && !DECL_ARTIFICIAL (p)
770 && (scope != file_scope
771 || (TREE_STATIC (p) && !TREE_PUBLIC (p)
772 && !TREE_THIS_VOLATILE (p)))
773 && scope != external_scope)
774 warning ("%Junused variable `%D'", p, p);
778 error ("%Jtype of array %qD completed incompatibly with"
779 " implicit initialization", p, p);
786 /* All of these go in BLOCK_VARS, but only if this is the
787 binding in the home scope. */
790 TREE_CHAIN (p) = BLOCK_VARS (block);
791 BLOCK_VARS (block) = p;
793 /* If this is the file scope, and we are processing more
794 than one translation unit in this compilation, set
795 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
796 This makes same_translation_unit_p work, and causes
797 static declarations to be given disambiguating suffixes. */
798 if (scope == file_scope && num_in_fnames > 1)
800 DECL_CONTEXT (p) = context;
801 if (TREE_CODE (p) == TYPE_DECL)
802 set_type_context (TREE_TYPE (p), context);
806 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
807 already been put there by store_parm_decls. Unused-
808 parameter warnings are handled by function.c.
809 error_mark_node obviously does not go in BLOCK_VARS and
810 does not get unused-variable warnings. */
813 /* It is possible for a decl not to have a name. We get
814 here with b->id NULL in this case. */
817 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
818 I_SYMBOL_BINDING (b->id) = b->shadowed;
819 if (b->shadowed && b->shadowed->type)
820 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
830 /* Dispose of the block that we just made inside some higher level. */
831 if ((scope->function_body || scope == file_scope) && context)
833 DECL_INITIAL (context) = block;
834 BLOCK_SUPERCONTEXT (block) = context;
836 else if (scope->outer)
839 SCOPE_LIST_APPEND (scope->outer, blocks, block);
840 /* If we did not make a block for the scope just exited, any
841 blocks made for inner scopes must be carried forward so they
842 will later become subblocks of something else. */
843 else if (scope->blocks)
844 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
847 /* Pop the current scope, and free the structure for reuse. */
848 current_scope = scope->outer;
849 if (scope->function_body)
850 current_function_scope = scope->outer_function;
852 memset (scope, 0, sizeof (struct c_scope));
853 scope->outer = scope_freelist;
854 scope_freelist = scope;
860 push_file_scope (void)
868 file_scope = current_scope;
870 start_fname_decls ();
872 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
873 bind (DECL_NAME (decl), decl, file_scope,
874 /*invisible=*/false, /*nested=*/true);
878 pop_file_scope (void)
880 /* In case there were missing closebraces, get us back to the global
882 while (current_scope != file_scope)
885 /* __FUNCTION__ is defined at file scope (""). This
886 call may not be necessary as my tests indicate it
887 still works without it. */
888 finish_fname_decls ();
890 /* This is the point to write out a PCH if we're doing that.
891 In that case we do not want to do anything else. */
894 c_common_write_pch ();
898 /* Pop off the file scope and close this translation unit. */
901 cgraph_finalize_compilation_unit ();
904 /* Insert BLOCK at the end of the list of subblocks of the current
905 scope. This is used when a BIND_EXPR is expanded, to handle the
906 BLOCK node inside the BIND_EXPR. */
909 insert_block (tree block)
911 TREE_USED (block) = 1;
912 SCOPE_LIST_APPEND (current_scope, blocks, block);
915 /* Push a definition or a declaration of struct, union or enum tag "name".
916 "type" should be the type node.
917 We assume that the tag "name" is not already defined.
919 Note that the definition may really be just a forward reference.
920 In that case, the TYPE_SIZE will be zero. */
923 pushtag (tree name, tree type)
925 /* Record the identifier as the type's name if it has none. */
926 if (name && !TYPE_NAME (type))
927 TYPE_NAME (type) = name;
928 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
930 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
931 tagged type we just added to the current scope. This fake
932 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
933 to output a representation of a tagged type, and it also gives
934 us a convenient place to record the "scope start" address for the
937 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
939 /* An approximation for now, so we can tell this is a function-scope tag.
940 This will be updated in pop_scope. */
941 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
944 /* Subroutine of compare_decls. Allow harmless mismatches in return
945 and argument types provided that the type modes match. This function
946 return a unified type given a suitable match, and 0 otherwise. */
949 match_builtin_function_types (tree newtype, tree oldtype)
951 tree newrettype, oldrettype;
952 tree newargs, oldargs;
953 tree trytype, tryargs;
955 /* Accept the return type of the new declaration if same modes. */
956 oldrettype = TREE_TYPE (oldtype);
957 newrettype = TREE_TYPE (newtype);
959 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
962 oldargs = TYPE_ARG_TYPES (oldtype);
963 newargs = TYPE_ARG_TYPES (newtype);
966 while (oldargs || newargs)
970 || ! TREE_VALUE (oldargs)
971 || ! TREE_VALUE (newargs)
972 || TYPE_MODE (TREE_VALUE (oldargs))
973 != TYPE_MODE (TREE_VALUE (newargs)))
976 oldargs = TREE_CHAIN (oldargs);
977 newargs = TREE_CHAIN (newargs);
980 trytype = build_function_type (newrettype, tryargs);
981 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
984 /* Subroutine of diagnose_mismatched_decls. Check for function type
985 mismatch involving an empty arglist vs a nonempty one and give clearer
988 diagnose_arglist_conflict (tree newdecl, tree olddecl,
989 tree newtype, tree oldtype)
993 if (TREE_CODE (olddecl) != FUNCTION_DECL
994 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
995 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
997 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1000 t = TYPE_ARG_TYPES (oldtype);
1002 t = TYPE_ARG_TYPES (newtype);
1003 for (; t; t = TREE_CHAIN (t))
1005 tree type = TREE_VALUE (t);
1007 if (TREE_CHAIN (t) == 0
1008 && TYPE_MAIN_VARIANT (type) != void_type_node)
1010 inform ("a parameter list with an ellipsis can't match "
1011 "an empty parameter name list declaration");
1015 if (c_type_promotes_to (type) != type)
1017 inform ("an argument type that has a default promotion can't match "
1018 "an empty parameter name list declaration");
1024 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1025 old-style function definition, NEWDECL is a prototype declaration.
1026 Diagnose inconsistencies in the argument list. Returns TRUE if
1027 the prototype is compatible, FALSE if not. */
1029 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1031 tree newargs, oldargs;
1034 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
1035 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
1037 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1038 newargs = TYPE_ARG_TYPES (newtype);
1043 tree oldargtype = TREE_VALUE (oldargs);
1044 tree newargtype = TREE_VALUE (newargs);
1046 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1049 /* Reaching the end of just one list means the two decls don't
1050 agree on the number of arguments. */
1051 if (END_OF_ARGLIST (oldargtype))
1053 error ("%Jprototype for '%D' declares more arguments "
1054 "than previous old-style definition", newdecl, newdecl);
1057 else if (END_OF_ARGLIST (newargtype))
1059 error ("%Jprototype for '%D' declares fewer arguments "
1060 "than previous old-style definition", newdecl, newdecl);
1064 /* Type for passing arg must be consistent with that declared
1066 else if (! comptypes (oldargtype, newargtype))
1068 error ("%Jprototype for '%D' declares arg %d with incompatible type",
1069 newdecl, newdecl, i);
1073 oldargs = TREE_CHAIN (oldargs);
1074 newargs = TREE_CHAIN (newargs);
1078 /* If we get here, no errors were found, but do issue a warning
1079 for this poor-style construct. */
1080 warning ("%Jprototype for '%D' follows non-prototype definition",
1083 #undef END_OF_ARGLIST
1086 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1087 first in a pair of mismatched declarations, using the diagnostic
1090 locate_old_decl (tree decl, void (*diag)(const char *, ...))
1092 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1094 else if (DECL_INITIAL (decl))
1095 diag (N_("%Jprevious definition of '%D' was here"), decl, decl);
1096 else if (C_DECL_IMPLICIT (decl))
1097 diag (N_("%Jprevious implicit declaration of '%D' was here"), decl, decl);
1099 diag (N_("%Jprevious declaration of '%D' was here"), decl, decl);
1102 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1103 Returns true if the caller should proceed to merge the two, false
1104 if OLDDECL should simply be discarded. As a side effect, issues
1105 all necessary diagnostics for invalid or poor-style combinations.
1106 If it returns true, writes the types of NEWDECL and OLDDECL to
1107 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1108 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1111 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1112 tree *newtypep, tree *oldtypep)
1114 tree newtype, oldtype;
1115 bool pedwarned = false;
1116 bool warned = false;
1118 /* If we have error_mark_node for either decl or type, just discard
1119 the previous decl - we're in an error cascade already. */
1120 if (olddecl == error_mark_node || newdecl == error_mark_node)
1122 *oldtypep = oldtype = TREE_TYPE (olddecl);
1123 *newtypep = newtype = TREE_TYPE (newdecl);
1124 if (oldtype == error_mark_node || newtype == error_mark_node)
1127 /* Two different categories of symbol altogether. This is an error
1128 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1129 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1131 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1132 && DECL_BUILT_IN (olddecl)
1133 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1135 error ("%J'%D' redeclared as different kind of symbol",
1137 locate_old_decl (olddecl, error);
1139 else if (TREE_PUBLIC (newdecl))
1140 warning ("%Jbuilt-in function '%D' declared as non-function",
1142 else if (warn_shadow)
1143 warning ("%Jdeclaration of '%D' shadows a built-in function",
1148 if (!comptypes (oldtype, newtype))
1150 if (TREE_CODE (olddecl) == FUNCTION_DECL
1151 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1153 /* Accept harmless mismatch in function types.
1154 This is for the ffs and fprintf builtins. */
1155 tree trytype = match_builtin_function_types (newtype, oldtype);
1157 if (trytype && comptypes (newtype, trytype))
1158 *oldtypep = oldtype = trytype;
1161 /* If types don't match for a built-in, throw away the
1162 built-in. No point in calling locate_old_decl here, it
1163 won't print anything. */
1164 warning ("%Jconflicting types for built-in function '%D'",
1169 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1170 && DECL_IS_BUILTIN (olddecl))
1172 /* A conflicting function declaration for a predeclared
1173 function that isn't actually built in. Objective C uses
1174 these. The new declaration silently overrides everything
1175 but the volatility (i.e. noreturn) indication. See also
1176 below. FIXME: Make Objective C use normal builtins. */
1177 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1180 /* Permit void foo (...) to match int foo (...) if the latter is
1181 the definition and implicit int was used. See
1182 c-torture/compile/920625-2.c. */
1183 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1184 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1185 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1186 && C_FUNCTION_IMPLICIT_INT (newdecl))
1188 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
1189 /* Make sure we keep void as the return type. */
1190 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1191 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1196 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1197 error ("%J conflicting type qualifiers for '%D'", newdecl, newdecl);
1199 error ("%Jconflicting types for '%D'", newdecl, newdecl);
1200 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1201 locate_old_decl (olddecl, error);
1206 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1207 but silently ignore the redeclaration if either is in a system
1208 header. (Conflicting redeclarations were handled above.) */
1209 if (TREE_CODE (newdecl) == TYPE_DECL)
1211 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1212 return true; /* Allow OLDDECL to continue in use. */
1214 error ("%Jredefinition of typedef '%D'", newdecl, newdecl);
1215 locate_old_decl (olddecl, error);
1219 /* Function declarations can either be 'static' or 'extern' (no
1220 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1221 can never conflict with each other on account of linkage (6.2.2p4).
1222 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1223 two definitions if one is 'extern inline' and one is not. The non-
1224 extern-inline definition supersedes the extern-inline definition. */
1225 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1227 /* If you declare a built-in function name as static, or
1228 define the built-in with an old-style definition (so we
1229 can't validate the argument list) the built-in definition is
1230 overridden, but optionally warn this was a bad choice of name. */
1231 if (DECL_BUILT_IN (olddecl)
1232 && !C_DECL_DECLARED_BUILTIN (olddecl)
1233 && (!TREE_PUBLIC (newdecl)
1234 || (DECL_INITIAL (newdecl)
1235 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1238 warning ("%Jdeclaration of '%D' shadows a built-in function",
1240 /* Discard the old built-in function. */
1244 if (DECL_INITIAL (newdecl))
1246 if (DECL_INITIAL (olddecl)
1247 && !(DECL_DECLARED_INLINE_P (olddecl)
1248 && DECL_EXTERNAL (olddecl)
1249 && !(DECL_DECLARED_INLINE_P (newdecl)
1250 && DECL_EXTERNAL (newdecl)
1251 && same_translation_unit_p (olddecl, newdecl))))
1253 error ("%Jredefinition of '%D'", newdecl, newdecl);
1254 locate_old_decl (olddecl, error);
1258 /* If we have a prototype after an old-style function definition,
1259 the argument types must be checked specially. */
1260 else if (DECL_INITIAL (olddecl)
1261 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1262 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1263 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1265 locate_old_decl (olddecl, error);
1268 /* A non-static declaration (even an "extern") followed by a
1269 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1270 The same is true for a static forward declaration at block
1271 scope followed by a non-static declaration/definition at file
1272 scope. Static followed by non-static at the same scope is
1273 not undefined behavior, and is the most convenient way to get
1274 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1275 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1276 we do diagnose it if -Wtraditional. */
1277 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1279 /* Two exceptions to the rule. If olddecl is an extern
1280 inline, or a predeclared function that isn't actually
1281 built in, newdecl silently overrides olddecl. The latter
1282 occur only in Objective C; see also above. (FIXME: Make
1283 Objective C use normal builtins.) */
1284 if (!DECL_IS_BUILTIN (olddecl)
1285 && !(DECL_EXTERNAL (olddecl)
1286 && DECL_DECLARED_INLINE_P (olddecl)))
1288 error ("%Jstatic declaration of '%D' follows "
1289 "non-static declaration", newdecl, newdecl);
1290 locate_old_decl (olddecl, error);
1294 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1296 if (DECL_CONTEXT (olddecl))
1298 error ("%Jnon-static declaration of '%D' follows "
1299 "static declaration", newdecl, newdecl);
1300 locate_old_decl (olddecl, error);
1303 else if (warn_traditional)
1305 warning ("%Jnon-static declaration of '%D' follows "
1306 "static declaration", newdecl, newdecl);
1311 else if (TREE_CODE (newdecl) == VAR_DECL)
1313 /* Only variables can be thread-local, and all declarations must
1314 agree on this property. */
1315 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1317 if (DECL_THREAD_LOCAL (newdecl))
1318 error ("%Jthread-local declaration of '%D' follows "
1319 "non-thread-local declaration", newdecl, newdecl);
1321 error ("%Jnon-thread-local declaration of '%D' follows "
1322 "thread-local declaration", newdecl, newdecl);
1324 locate_old_decl (olddecl, error);
1328 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1329 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1331 error ("%Jredefinition of '%D'", newdecl, newdecl);
1332 locate_old_decl (olddecl, error);
1336 /* Objects declared at file scope: if the first declaration had
1337 external linkage (even if it was an external reference) the
1338 second must have external linkage as well, or the behavior is
1339 undefined. If the first declaration had internal linkage, then
1340 the second must too, or else be an external reference (in which
1341 case the composite declaration still has internal linkage).
1342 As for function declarations, we warn about the static-then-
1343 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1344 if (DECL_FILE_SCOPE_P (newdecl)
1345 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1347 if (DECL_EXTERNAL (newdecl))
1349 if (!DECL_FILE_SCOPE_P (olddecl))
1351 error ("%Jextern declaration of %qD follows "
1352 "declaration with no linkage", newdecl, newdecl);
1353 locate_old_decl (olddecl, error);
1356 else if (warn_traditional)
1358 warning ("%Jnon-static declaration of '%D' follows "
1359 "static declaration", newdecl, newdecl);
1365 if (TREE_PUBLIC (newdecl))
1366 error ("%Jnon-static declaration of '%D' follows "
1367 "static declaration", newdecl, newdecl);
1369 error ("%Jstatic declaration of '%D' follows "
1370 "non-static declaration", newdecl, newdecl);
1372 locate_old_decl (olddecl, error);
1376 /* Two objects with the same name declared at the same block
1377 scope must both be external references (6.7p3). */
1378 else if (!DECL_FILE_SCOPE_P (newdecl))
1380 if (DECL_EXTERNAL (newdecl))
1382 /* Extern with initializer at block scope, which will
1383 already have received an error. */
1385 else if (DECL_EXTERNAL (olddecl))
1387 error ("%Jdeclaration of '%D' with no linkage follows "
1388 "extern declaration", newdecl, newdecl);
1389 locate_old_decl (olddecl, error);
1393 error ("%Jredeclaration of '%D' with no linkage",
1395 locate_old_decl (olddecl, error);
1403 /* All decls must agree on a visibility. */
1404 if (DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1405 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1407 warning ("%Jredeclaration of '%D' with different visibility "
1408 "(old visibility preserved)", newdecl, newdecl);
1412 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1414 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1415 if (DECL_DECLARED_INLINE_P (newdecl)
1416 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1418 warning ("%Jinline declaration of '%D' follows "
1419 "declaration with attribute noinline", newdecl, newdecl);
1422 else if (DECL_DECLARED_INLINE_P (olddecl)
1423 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1425 warning ("%Jdeclaration of '%D' with attribute noinline follows "
1426 "inline declaration ", newdecl, newdecl);
1430 /* Inline declaration after use or definition.
1431 ??? Should we still warn about this now we have unit-at-a-time
1432 mode and can get it right?
1433 Definitely don't complain if the decls are in different translation
1435 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1436 && same_translation_unit_p (olddecl, newdecl))
1438 if (TREE_USED (olddecl))
1440 warning ("%J'%D' declared inline after being called",
1444 else if (DECL_INITIAL (olddecl))
1446 warning ("%J'%D' declared inline after its definition",
1452 else /* PARM_DECL, VAR_DECL */
1454 /* Redeclaration of a parameter is a constraint violation (this is
1455 not explicitly stated, but follows from C99 6.7p3 [no more than
1456 one declaration of the same identifier with no linkage in the
1457 same scope, except type tags] and 6.2.2p6 [parameters have no
1458 linkage]). We must check for a forward parameter declaration,
1459 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1460 an extension, the mandatory diagnostic for which is handled by
1461 mark_forward_parm_decls. */
1463 if (TREE_CODE (newdecl) == PARM_DECL
1464 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1466 error ("%Jredefinition of parameter '%D'", newdecl, newdecl);
1467 locate_old_decl (olddecl, error);
1472 /* Optional warning for completely redundant decls. */
1473 if (!warned && !pedwarned
1474 && warn_redundant_decls
1475 /* Don't warn about a function declaration followed by a
1477 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1478 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1479 /* Don't warn about redundant redeclarations of builtins. */
1480 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1481 && !DECL_BUILT_IN (newdecl)
1482 && DECL_BUILT_IN (olddecl)
1483 && !C_DECL_DECLARED_BUILTIN (olddecl))
1484 /* Don't warn about an extern followed by a definition. */
1485 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1486 /* Don't warn about forward parameter decls. */
1487 && !(TREE_CODE (newdecl) == PARM_DECL
1488 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1490 warning ("%Jredundant redeclaration of '%D'", newdecl, newdecl);
1494 /* Report location of previous decl/defn in a consistent manner. */
1495 if (warned || pedwarned)
1496 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1501 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1502 consistent with OLDDECL, but carries new information. Merge the
1503 new information into OLDDECL. This function issues no
1507 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1509 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1510 && DECL_INITIAL (newdecl) != 0);
1512 /* For real parm decl following a forward decl, rechain the old decl
1513 in its new location and clear TREE_ASM_WRITTEN (it's not a
1514 forward decl anymore). */
1515 if (TREE_CODE (newdecl) == PARM_DECL
1516 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1518 struct c_binding *b, **here;
1520 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1521 if ((*here)->decl == olddecl)
1528 b->prev = current_scope->bindings;
1529 current_scope->bindings = b;
1531 TREE_ASM_WRITTEN (olddecl) = 0;
1534 DECL_ATTRIBUTES (newdecl)
1535 = targetm.merge_decl_attributes (olddecl, newdecl);
1537 /* Merge the data types specified in the two decls. */
1539 = TREE_TYPE (olddecl)
1540 = composite_type (newtype, oldtype);
1542 /* Lay the type out, unless already done. */
1543 if (oldtype != TREE_TYPE (newdecl))
1545 if (TREE_TYPE (newdecl) != error_mark_node)
1546 layout_type (TREE_TYPE (newdecl));
1547 if (TREE_CODE (newdecl) != FUNCTION_DECL
1548 && TREE_CODE (newdecl) != TYPE_DECL
1549 && TREE_CODE (newdecl) != CONST_DECL)
1550 layout_decl (newdecl, 0);
1554 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1555 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1556 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1557 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1558 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1559 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1561 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1562 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1566 /* Keep the old rtl since we can safely use it. */
1567 COPY_DECL_RTL (olddecl, newdecl);
1569 /* Merge the type qualifiers. */
1570 if (TREE_READONLY (newdecl))
1571 TREE_READONLY (olddecl) = 1;
1573 if (TREE_THIS_VOLATILE (newdecl))
1575 TREE_THIS_VOLATILE (olddecl) = 1;
1576 if (TREE_CODE (newdecl) == VAR_DECL)
1577 make_var_volatile (newdecl);
1580 /* Keep source location of definition rather than declaration. */
1581 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1582 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1584 /* Merge the unused-warning information. */
1585 if (DECL_IN_SYSTEM_HEADER (olddecl))
1586 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1587 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1588 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1590 /* Merge the initialization information. */
1591 if (DECL_INITIAL (newdecl) == 0)
1592 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1594 /* Merge the section attribute.
1595 We want to issue an error if the sections conflict but that must be
1596 done later in decl_attributes since we are called before attributes
1598 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1599 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1601 /* Copy the assembler name.
1602 Currently, it can only be defined in the prototype. */
1603 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1605 /* Use visibility of whichever declaration had it specified */
1606 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1608 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1609 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1612 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1614 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1615 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1616 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1617 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1618 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1619 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1620 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1621 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1622 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1625 /* Merge the storage class information. */
1626 merge_weak (newdecl, olddecl);
1628 /* For functions, static overrides non-static. */
1629 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1631 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1632 /* This is since we don't automatically
1633 copy the attributes of NEWDECL into OLDDECL. */
1634 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1635 /* If this clears `static', clear it in the identifier too. */
1636 if (! TREE_PUBLIC (olddecl))
1637 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1639 if (DECL_EXTERNAL (newdecl))
1641 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1642 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1644 /* An extern decl does not override previous storage class. */
1645 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1646 if (! DECL_EXTERNAL (newdecl))
1648 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1649 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1654 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1655 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1658 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1660 /* If we're redefining a function previously defined as extern
1661 inline, make sure we emit debug info for the inline before we
1662 throw it away, in case it was inlined into a function that hasn't
1663 been written out yet. */
1664 if (new_is_definition && DECL_INITIAL (olddecl))
1666 if (TREE_USED (olddecl)
1667 /* In unit-at-a-time mode we never inline re-defined extern
1668 inline functions. */
1669 && !flag_unit_at_a_time
1670 && cgraph_function_possibly_inlined_p (olddecl))
1671 (*debug_hooks->outlining_inline_function) (olddecl);
1673 /* The new defn must not be inline. */
1674 DECL_INLINE (newdecl) = 0;
1675 DECL_UNINLINABLE (newdecl) = 1;
1679 /* If either decl says `inline', this fn is inline,
1680 unless its definition was passed already. */
1681 if (DECL_DECLARED_INLINE_P (newdecl)
1682 || DECL_DECLARED_INLINE_P (olddecl))
1683 DECL_DECLARED_INLINE_P (newdecl) = 1;
1685 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1686 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1689 if (DECL_BUILT_IN (olddecl))
1691 /* If redeclaring a builtin function, it stays built in.
1692 But it gets tagged as having been declared. */
1693 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1694 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1695 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1698 /* Also preserve various other info from the definition. */
1699 if (! new_is_definition)
1701 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1702 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1703 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1704 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1705 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1707 /* Set DECL_INLINE on the declaration if we've got a body
1708 from which to instantiate. */
1709 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1711 DECL_INLINE (newdecl) = 1;
1712 DECL_ABSTRACT_ORIGIN (newdecl)
1713 = DECL_ABSTRACT_ORIGIN (olddecl);
1718 /* If a previous declaration said inline, mark the
1719 definition as inlinable. */
1720 if (DECL_DECLARED_INLINE_P (newdecl)
1721 && ! DECL_UNINLINABLE (newdecl))
1722 DECL_INLINE (newdecl) = 1;
1726 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1727 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1729 unsigned olddecl_uid = DECL_UID (olddecl);
1730 tree olddecl_context = DECL_CONTEXT (olddecl);
1732 memcpy ((char *) olddecl + sizeof (struct tree_common),
1733 (char *) newdecl + sizeof (struct tree_common),
1734 sizeof (struct tree_decl) - sizeof (struct tree_common));
1735 DECL_UID (olddecl) = olddecl_uid;
1736 DECL_CONTEXT (olddecl) = olddecl_context;
1739 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1740 so that encode_section_info has a chance to look at the new decl
1741 flags and attributes. */
1742 if (DECL_RTL_SET_P (olddecl)
1743 && (TREE_CODE (olddecl) == FUNCTION_DECL
1744 || (TREE_CODE (olddecl) == VAR_DECL
1745 && TREE_STATIC (olddecl))))
1746 make_decl_rtl (olddecl);
1749 /* Handle when a new declaration NEWDECL has the same name as an old
1750 one OLDDECL in the same binding contour. Prints an error message
1753 If safely possible, alter OLDDECL to look like NEWDECL, and return
1754 true. Otherwise, return false. */
1757 duplicate_decls (tree newdecl, tree olddecl)
1759 tree newtype = NULL, oldtype = NULL;
1761 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1764 merge_decls (newdecl, olddecl, newtype, oldtype);
1769 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1771 warn_if_shadowing (tree new_decl)
1773 struct c_binding *b;
1775 /* Shadow warnings wanted? */
1777 /* No shadow warnings for internally generated vars. */
1778 || DECL_IS_BUILTIN (new_decl)
1779 /* No shadow warnings for vars made for inlining. */
1780 || DECL_FROM_INLINE (new_decl)
1781 /* Don't warn about the parm names in function declarator
1782 within a function declarator. It would be nice to avoid
1783 warning in any function declarator in a declaration, as
1784 opposed to a definition, but there is no way to tell
1785 it's not a definition at this point. */
1786 || (TREE_CODE (new_decl) == PARM_DECL && current_scope->outer->parm_flag))
1789 /* Is anything being shadowed? Invisible decls do not count. */
1790 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1791 if (b->decl && b->decl != new_decl && !b->invisible)
1793 tree old_decl = b->decl;
1795 if (TREE_CODE (old_decl) == PARM_DECL)
1796 warning ("%Jdeclaration of '%D' shadows a parameter",
1797 new_decl, new_decl);
1798 else if (DECL_FILE_SCOPE_P (old_decl))
1799 warning ("%Jdeclaration of '%D' shadows a global declaration",
1800 new_decl, new_decl);
1801 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1802 && DECL_BUILT_IN (old_decl))
1803 warning ("%Jdeclaration of '%D' shadows a built-in function",
1804 new_decl, new_decl);
1806 warning ("%Jdeclaration of '%D' shadows a previous local",
1807 new_decl, new_decl);
1809 if (TREE_CODE (old_decl) != FUNCTION_DECL
1810 || ! DECL_BUILT_IN (old_decl))
1811 warning ("%Jshadowed declaration is here", old_decl);
1818 /* Subroutine of pushdecl.
1820 X is a TYPE_DECL for a typedef statement. Create a brand new
1821 ..._TYPE node (which will be just a variant of the existing
1822 ..._TYPE node with identical properties) and then install X
1823 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1825 The whole point here is to end up with a situation where each
1826 and every ..._TYPE node the compiler creates will be uniquely
1827 associated with AT MOST one node representing a typedef name.
1828 This way, even though the compiler substitutes corresponding
1829 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1830 early on, later parts of the compiler can always do the reverse
1831 translation and get back the corresponding typedef name. For
1834 typedef struct S MY_TYPE;
1837 Later parts of the compiler might only know that `object' was of
1838 type `struct S' if it were not for code just below. With this
1839 code however, later parts of the compiler see something like:
1841 struct S' == struct S
1842 typedef struct S' MY_TYPE;
1845 And they can then deduce (from the node for type struct S') that
1846 the original object declaration was:
1850 Being able to do this is important for proper support of protoize,
1851 and also for generating precise symbolic debugging information
1852 which takes full account of the programmer's (typedef) vocabulary.
1854 Obviously, we don't want to generate a duplicate ..._TYPE node if
1855 the TYPE_DECL node that we are now processing really represents a
1856 standard built-in type.
1858 Since all standard types are effectively declared at line zero
1859 in the source file, we can easily check to see if we are working
1860 on a standard type by checking the current value of lineno. */
1863 clone_underlying_type (tree x)
1865 if (DECL_IS_BUILTIN (x))
1867 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1868 TYPE_NAME (TREE_TYPE (x)) = x;
1870 else if (TREE_TYPE (x) != error_mark_node
1871 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1873 tree tt = TREE_TYPE (x);
1874 DECL_ORIGINAL_TYPE (x) = tt;
1875 tt = build_variant_type_copy (tt);
1877 TREE_USED (tt) = TREE_USED (x);
1882 /* Record a decl-node X as belonging to the current lexical scope.
1883 Check for errors (such as an incompatible declaration for the same
1884 name already seen in the same scope).
1886 Returns either X or an old decl for the same name.
1887 If an old decl is returned, it may have been smashed
1888 to agree with what X says. */
1893 tree name = DECL_NAME (x);
1894 struct c_scope *scope = current_scope;
1895 struct c_binding *b;
1896 bool nested = false;
1898 /* Functions need the lang_decl data. */
1899 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1900 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
1902 /* Must set DECL_CONTEXT for everything not at file scope or
1903 DECL_FILE_SCOPE_P won't work. Local externs don't count
1904 unless they have initializers (which generate code). */
1905 if (current_function_decl
1906 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
1907 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
1908 DECL_CONTEXT (x) = current_function_decl;
1910 /* Anonymous decls are just inserted in the scope. */
1913 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
1917 /* First, see if there is another declaration with the same name in
1918 the current scope. If there is, duplicate_decls may do all the
1919 work for us. If duplicate_decls returns false, that indicates
1920 two incompatible decls in the same scope; we are to silently
1921 replace the old one (duplicate_decls has issued all appropriate
1922 diagnostics). In particular, we should not consider possible
1923 duplicates in the external scope, or shadowing. */
1924 b = I_SYMBOL_BINDING (name);
1925 if (b && B_IN_SCOPE (b, scope))
1927 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
1928 && COMPLETE_TYPE_P (TREE_TYPE (x)))
1929 b->inner_comp = false;
1930 if (duplicate_decls (x, b->decl))
1933 goto skip_external_and_shadow_checks;
1936 /* All declarations with external linkage, and all external
1937 references, go in the external scope, no matter what scope is
1938 current. However, the binding in that scope is ignored for
1939 purposes of normal name lookup. A separate binding structure is
1940 created in the requested scope; this governs the normal
1941 visibility of the symbol.
1943 The binding in the externals scope is used exclusively for
1944 detecting duplicate declarations of the same object, no matter
1945 what scope they are in; this is what we do here. (C99 6.2.7p2:
1946 All declarations that refer to the same object or function shall
1947 have compatible type; otherwise, the behavior is undefined.) */
1948 if (DECL_EXTERNAL (x) || scope == file_scope)
1950 tree type = TREE_TYPE (x);
1953 bool type_saved = false;
1954 if (b && !B_IN_EXTERNAL_SCOPE (b)
1955 && (TREE_CODE (b->decl) == FUNCTION_DECL
1956 || TREE_CODE (b->decl) == VAR_DECL)
1957 && DECL_FILE_SCOPE_P (b->decl))
1960 vistype = TREE_TYPE (visdecl);
1962 if (warn_nested_externs
1963 && scope != file_scope
1964 && !DECL_IN_SYSTEM_HEADER (x))
1965 warning ("nested extern declaration of '%D'", x);
1967 while (b && !B_IN_EXTERNAL_SCOPE (b))
1969 /* If this decl might be modified, save its type. This is
1970 done here rather than when the decl is first bound
1971 because the type may change after first binding, through
1972 being completed or through attributes being added. If we
1973 encounter multiple such decls, only the first should have
1974 its type saved; the others will already have had their
1975 proper types saved and the types will not have changed as
1976 their scopes will not have been re-entered. */
1977 if (DECL_FILE_SCOPE_P (b->decl) && !type_saved)
1979 b->type = TREE_TYPE (b->decl);
1982 if (B_IN_FILE_SCOPE (b)
1983 && TREE_CODE (b->decl) == VAR_DECL
1984 && TREE_STATIC (b->decl)
1985 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
1986 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
1987 && TREE_CODE (type) == ARRAY_TYPE
1988 && TYPE_DOMAIN (type)
1989 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
1990 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
1992 /* Array type completed in inner scope, which should be
1993 diagnosed if the completion does not have size 1 and
1994 it does not get completed in the file scope. */
1995 b->inner_comp = true;
2000 /* If a matching external declaration has been found, set its
2001 type to the composite of all the types of that declaration.
2002 After the consistency checks, it will be reset to the
2003 composite of the visible types only. */
2004 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2006 TREE_TYPE (b->decl) = b->type;
2008 /* The point of the same_translation_unit_p check here is,
2009 we want to detect a duplicate decl for a construct like
2010 foo() { extern bar(); } ... static bar(); but not if
2011 they are in different translation units. In any case,
2012 the static does not go in the externals scope. */
2014 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2015 && duplicate_decls (x, b->decl))
2018 thistype = (vistype ? composite_type (vistype, type) : type);
2019 b->type = TREE_TYPE (b->decl);
2020 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2022 = build_type_attribute_variant (thistype,
2023 TYPE_ATTRIBUTES (b->type));
2024 TREE_TYPE (b->decl) = thistype;
2025 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2028 else if (TREE_PUBLIC (x))
2030 if (visdecl && !b && duplicate_decls (x, visdecl))
2032 /* An external declaration at block scope referring to a
2033 visible entity with internal linkage. The composite
2034 type will already be correct for this scope, so we
2035 just need to fall through to make the declaration in
2041 bind (name, x, external_scope, /*invisible=*/true,
2047 /* Similarly, a declaration of a function with static linkage at
2048 block scope must be checked against any existing declaration
2049 of that function at file scope. */
2050 else if (TREE_CODE (x) == FUNCTION_DECL && scope != file_scope
2051 && !TREE_PUBLIC (x) && !DECL_INITIAL (x))
2053 if (warn_nested_externs && !DECL_IN_SYSTEM_HEADER (x))
2054 warning ("nested static declaration of '%D'", x);
2056 while (b && !B_IN_FILE_SCOPE (b))
2059 if (b && same_translation_unit_p (x, b->decl)
2060 && duplicate_decls (x, b->decl))
2062 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2067 bind (name, x, file_scope, /*invisible=*/true, /*nested=*/false);
2072 warn_if_shadowing (x);
2074 skip_external_and_shadow_checks:
2075 if (TREE_CODE (x) == TYPE_DECL)
2076 clone_underlying_type (x);
2078 bind (name, x, scope, /*invisible=*/false, nested);
2080 /* If x's type is incomplete because it's based on a
2081 structure or union which has not yet been fully declared,
2082 attach it to that structure or union type, so we can go
2083 back and complete the variable declaration later, if the
2084 structure or union gets fully declared.
2086 If the input is erroneous, we can have error_mark in the type
2087 slot (e.g. "f(void a, ...)") - that doesn't count as an
2089 if (TREE_TYPE (x) != error_mark_node
2090 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2092 tree element = TREE_TYPE (x);
2094 while (TREE_CODE (element) == ARRAY_TYPE)
2095 element = TREE_TYPE (element);
2096 element = TYPE_MAIN_VARIANT (element);
2098 if ((TREE_CODE (element) == RECORD_TYPE
2099 || TREE_CODE (element) == UNION_TYPE)
2100 && (TREE_CODE (x) != TYPE_DECL
2101 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2102 && !COMPLETE_TYPE_P (element))
2103 C_TYPE_INCOMPLETE_VARS (element)
2104 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2109 /* Record X as belonging to file scope.
2110 This is used only internally by the Objective-C front end,
2111 and is limited to its needs. duplicate_decls is not called;
2112 if there is any preexisting decl for this identifier, it is an ICE. */
2115 pushdecl_top_level (tree x)
2118 bool nested = false;
2120 gcc_assert (TREE_CODE (x) == VAR_DECL);
2122 name = DECL_NAME (x);
2124 gcc_assert (!I_SYMBOL_BINDING (name));
2126 if (TREE_PUBLIC (x))
2128 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2132 bind (name, x, file_scope, /*invisible=*/false, nested);
2138 implicit_decl_warning (tree id, tree olddecl)
2140 void (*diag) (const char *, ...);
2141 switch (mesg_implicit_function_declaration)
2144 case 1: diag = warning; break;
2145 case 2: diag = error; break;
2146 default: gcc_unreachable ();
2149 diag (N_("implicit declaration of function '%E'"), id);
2151 locate_old_decl (olddecl, diag);
2154 /* Generate an implicit declaration for identifier FUNCTIONID as a
2155 function of type int (). */
2158 implicitly_declare (tree functionid)
2160 struct c_binding *b;
2162 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2164 if (B_IN_SCOPE (b, external_scope))
2173 /* FIXME: Objective-C has weird not-really-builtin functions
2174 which are supposed to be visible automatically. They wind up
2175 in the external scope because they're pushed before the file
2176 scope gets created. Catch this here and rebind them into the
2178 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2180 bind (functionid, decl, file_scope,
2181 /*invisible=*/false, /*nested=*/true);
2186 tree newtype = default_function_type;
2188 TREE_TYPE (decl) = b->type;
2189 /* Implicit declaration of a function already declared
2190 (somehow) in a different scope, or as a built-in.
2191 If this is the first time this has happened, warn;
2192 then recycle the old declaration but with the new type. */
2193 if (!C_DECL_IMPLICIT (decl))
2195 implicit_decl_warning (functionid, decl);
2196 C_DECL_IMPLICIT (decl) = 1;
2198 if (DECL_BUILT_IN (decl))
2200 newtype = build_type_attribute_variant (newtype,
2202 (TREE_TYPE (decl)));
2203 if (!comptypes (newtype, TREE_TYPE (decl)))
2205 warning ("incompatible implicit declaration of built-in"
2206 " function %qD", decl);
2207 newtype = TREE_TYPE (decl);
2212 if (!comptypes (newtype, TREE_TYPE (decl)))
2214 error ("incompatible implicit declaration of function %qD",
2216 locate_old_decl (decl, error);
2219 b->type = TREE_TYPE (decl);
2220 TREE_TYPE (decl) = newtype;
2221 bind (functionid, decl, current_scope,
2222 /*invisible=*/false, /*nested=*/true);
2227 /* Not seen before. */
2228 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2229 DECL_EXTERNAL (decl) = 1;
2230 TREE_PUBLIC (decl) = 1;
2231 C_DECL_IMPLICIT (decl) = 1;
2232 implicit_decl_warning (functionid, 0);
2234 /* C89 says implicit declarations are in the innermost block.
2235 So we record the decl in the standard fashion. */
2236 decl = pushdecl (decl);
2238 /* No need to call objc_check_decl here - it's a function type. */
2239 rest_of_decl_compilation (decl, 0, 0);
2241 /* Write a record describing this implicit function declaration
2242 to the prototypes file (if requested). */
2243 gen_aux_info_record (decl, 0, 1, 0);
2245 /* Possibly apply some default attributes to this implicit declaration. */
2246 decl_attributes (&decl, NULL_TREE, 0);
2251 /* Issue an error message for a reference to an undeclared variable
2252 ID, including a reference to a builtin outside of function-call
2253 context. Establish a binding of the identifier to error_mark_node
2254 in an appropriate scope, which will suppress further errors for the
2257 undeclared_variable (tree id)
2259 static bool already = false;
2260 struct c_scope *scope;
2262 if (current_function_decl == 0)
2264 error ("'%E' undeclared here (not in a function)", id);
2265 scope = current_scope;
2269 error ("'%E' undeclared (first use in this function)", id);
2273 error ("(Each undeclared identifier is reported only once");
2274 error ("for each function it appears in.)");
2278 /* If we are parsing old-style parameter decls, current_function_decl
2279 will be nonnull but current_function_scope will be null. */
2280 scope = current_function_scope ? current_function_scope : current_scope;
2282 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2285 /* Subroutine of lookup_label, declare_label, define_label: construct a
2286 LABEL_DECL with all the proper frills. */
2289 make_label (tree name, location_t location)
2291 tree label = build_decl (LABEL_DECL, name, void_type_node);
2293 DECL_CONTEXT (label) = current_function_decl;
2294 DECL_MODE (label) = VOIDmode;
2295 DECL_SOURCE_LOCATION (label) = location;
2300 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2301 Create one if none exists so far for the current function.
2302 This is called when a label is used in a goto expression or
2303 has its address taken. */
2306 lookup_label (tree name)
2310 if (current_function_decl == 0)
2312 error ("label %s referenced outside of any function",
2313 IDENTIFIER_POINTER (name));
2317 /* Use a label already defined or ref'd with this name, but not if
2318 it is inherited from a containing function and wasn't declared
2320 label = I_LABEL_DECL (name);
2321 if (label && (DECL_CONTEXT (label) == current_function_decl
2322 || C_DECLARED_LABEL_FLAG (label)))
2324 /* If the label has only been declared, update its apparent
2325 location to point here, for better diagnostics if it
2326 turns out not to have been defined. */
2327 if (!TREE_USED (label))
2328 DECL_SOURCE_LOCATION (label) = input_location;
2332 /* No label binding for that identifier; make one. */
2333 label = make_label (name, input_location);
2335 /* Ordinary labels go in the current function scope. */
2336 bind (name, label, current_function_scope,
2337 /*invisible=*/false, /*nested=*/false);
2341 /* Make a label named NAME in the current function, shadowing silently
2342 any that may be inherited from containing functions or containing
2343 scopes. This is called for __label__ declarations. */
2346 declare_label (tree name)
2348 struct c_binding *b = I_LABEL_BINDING (name);
2351 /* Check to make sure that the label hasn't already been declared
2353 if (b && B_IN_CURRENT_SCOPE (b))
2355 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2356 locate_old_decl (b->decl, error);
2358 /* Just use the previous declaration. */
2362 label = make_label (name, input_location);
2363 C_DECLARED_LABEL_FLAG (label) = 1;
2365 /* Declared labels go in the current scope. */
2366 bind (name, label, current_scope,
2367 /*invisible=*/false, /*nested=*/false);
2371 /* Define a label, specifying the location in the source file.
2372 Return the LABEL_DECL node for the label, if the definition is valid.
2373 Otherwise return 0. */
2376 define_label (location_t location, tree name)
2378 /* Find any preexisting label with this name. It is an error
2379 if that label has already been defined in this function, or
2380 if there is a containing function with a declared label with
2382 tree label = I_LABEL_DECL (name);
2385 && ((DECL_CONTEXT (label) == current_function_decl
2386 && DECL_INITIAL (label) != 0)
2387 || (DECL_CONTEXT (label) != current_function_decl
2388 && C_DECLARED_LABEL_FLAG (label))))
2390 error ("%Hduplicate label `%D'", &location, label);
2391 locate_old_decl (label, error);
2394 else if (label && DECL_CONTEXT (label) == current_function_decl)
2396 /* The label has been used or declared already in this function,
2397 but not defined. Update its location to point to this
2399 DECL_SOURCE_LOCATION (label) = location;
2403 /* No label binding for that identifier; make one. */
2404 label = make_label (name, location);
2406 /* Ordinary labels go in the current function scope. */
2407 bind (name, label, current_function_scope,
2408 /*invisible=*/false, /*nested=*/false);
2411 if (warn_traditional && !in_system_header && lookup_name (name))
2412 warning ("%Htraditional C lacks a separate namespace for labels, "
2413 "identifier `%s' conflicts", &location,
2414 IDENTIFIER_POINTER (name));
2416 /* Mark label as having been defined. */
2417 DECL_INITIAL (label) = error_mark_node;
2421 /* Given NAME, an IDENTIFIER_NODE,
2422 return the structure (or union or enum) definition for that name.
2423 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2424 CODE says which kind of type the caller wants;
2425 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2426 If the wrong kind of type is found, an error is reported. */
2429 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2431 struct c_binding *b = I_TAG_BINDING (name);
2437 /* We only care about whether it's in this level if
2438 thislevel_only was set or it might be a type clash. */
2439 if (thislevel_only || TREE_CODE (b->decl) != code)
2441 /* For our purposes, a tag in the external scope is the same as
2442 a tag in the file scope. (Primarily relevant to Objective-C
2443 and its builtin structure tags, which get pushed before the
2444 file scope is created.) */
2445 if (B_IN_CURRENT_SCOPE (b)
2446 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2450 if (thislevel_only && !thislevel)
2453 if (TREE_CODE (b->decl) != code)
2455 /* Definition isn't the kind we were looking for. */
2456 pending_invalid_xref = name;
2457 pending_invalid_xref_location = input_location;
2459 /* If in the same binding level as a declaration as a tag
2460 of a different type, this must not be allowed to
2461 shadow that tag, so give the error immediately.
2462 (For example, "struct foo; union foo;" is invalid.) */
2464 pending_xref_error ();
2469 /* Print an error message now
2470 for a recent invalid struct, union or enum cross reference.
2471 We don't print them immediately because they are not invalid
2472 when used in the `struct foo;' construct for shadowing. */
2475 pending_xref_error (void)
2477 if (pending_invalid_xref != 0)
2478 error ("%H`%s' defined as wrong kind of tag",
2479 &pending_invalid_xref_location,
2480 IDENTIFIER_POINTER (pending_invalid_xref));
2481 pending_invalid_xref = 0;
2485 /* Look up NAME in the current scope and its superiors
2486 in the namespace of variables, functions and typedefs.
2487 Return a ..._DECL node of some kind representing its definition,
2488 or return 0 if it is undefined. */
2491 lookup_name (tree name)
2493 struct c_binding *b = I_SYMBOL_BINDING (name);
2494 if (b && !b->invisible)
2499 /* Similar to `lookup_name' but look only at the indicated scope. */
2502 lookup_name_in_scope (tree name, struct c_scope *scope)
2504 struct c_binding *b;
2506 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2507 if (B_IN_SCOPE (b, scope))
2512 /* Create the predefined scalar types of C,
2513 and some nodes representing standard constants (0, 1, (void *) 0).
2514 Initialize the global scope.
2515 Make definitions for built-in primitive functions. */
2518 c_init_decl_processing (void)
2521 tree ptr_ftype_void, ptr_ftype_ptr;
2522 location_t save_loc = input_location;
2524 /* Adds some ggc roots, and reserved words for c-parse.in. */
2527 current_function_decl = 0;
2529 gcc_obstack_init (&parser_obstack);
2531 /* Make the externals scope. */
2533 external_scope = current_scope;
2535 /* Declarations from c_common_nodes_and_builtins must not be associated
2536 with this input file, lest we get differences between using and not
2537 using preprocessed headers. */
2538 #ifdef USE_MAPPED_LOCATION
2539 input_location = BUILTINS_LOCATION;
2541 input_location.file = "<built-in>";
2542 input_location.line = 0;
2545 build_common_tree_nodes (flag_signed_char, false);
2547 c_common_nodes_and_builtins ();
2549 /* In C, comparisons and TRUTH_* expressions have type int. */
2550 truthvalue_type_node = integer_type_node;
2551 truthvalue_true_node = integer_one_node;
2552 truthvalue_false_node = integer_zero_node;
2554 /* Even in C99, which has a real boolean type. */
2555 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2556 boolean_type_node));
2558 endlink = void_list_node;
2559 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2561 = build_function_type (ptr_type_node,
2562 tree_cons (NULL_TREE, ptr_type_node, endlink));
2564 input_location = save_loc;
2566 pedantic_lvalues = true;
2568 make_fname_decl = c_make_fname_decl;
2569 start_fname_decls ();
2572 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2573 decl, NAME is the initialization string and TYPE_DEP indicates whether
2574 NAME depended on the type of the function. As we don't yet implement
2575 delayed emission of static data, we mark the decl as emitted
2576 so it is not placed in the output. Anything using it must therefore pull
2577 out the STRING_CST initializer directly. FIXME. */
2580 c_make_fname_decl (tree id, int type_dep)
2582 const char *name = fname_as_string (type_dep);
2583 tree decl, type, init;
2584 size_t length = strlen (name);
2586 type = build_array_type
2587 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2588 build_index_type (size_int (length)));
2590 decl = build_decl (VAR_DECL, id, type);
2592 TREE_STATIC (decl) = 1;
2593 TREE_READONLY (decl) = 1;
2594 DECL_ARTIFICIAL (decl) = 1;
2596 init = build_string (length + 1, name);
2597 free ((char *) name);
2598 TREE_TYPE (init) = type;
2599 DECL_INITIAL (decl) = init;
2601 TREE_USED (decl) = 1;
2603 if (current_function_decl)
2605 DECL_CONTEXT (decl) = current_function_decl;
2606 bind (id, decl, current_function_scope,
2607 /*invisible=*/false, /*nested=*/false);
2610 finish_decl (decl, init, NULL_TREE);
2615 /* Return a definition for a builtin function named NAME and whose data type
2616 is TYPE. TYPE should be a function type with argument types.
2617 FUNCTION_CODE tells later passes how to compile calls to this function.
2618 See tree.h for its possible values.
2620 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2621 the name to be called if we can't opencode the function. If
2622 ATTRS is nonzero, use that for the function's attribute list. */
2625 builtin_function (const char *name, tree type, int function_code,
2626 enum built_in_class cl, const char *library_name,
2629 tree id = get_identifier (name);
2630 tree decl = build_decl (FUNCTION_DECL, id, type);
2631 TREE_PUBLIC (decl) = 1;
2632 DECL_EXTERNAL (decl) = 1;
2633 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2634 DECL_BUILT_IN_CLASS (decl) = cl;
2635 DECL_FUNCTION_CODE (decl) = function_code;
2637 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2639 /* Should never be called on a symbol with a preexisting meaning. */
2640 gcc_assert (!I_SYMBOL_BINDING (id));
2642 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2644 /* Builtins in the implementation namespace are made visible without
2645 needing to be explicitly declared. See push_file_scope. */
2646 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2648 TREE_CHAIN (decl) = visible_builtins;
2649 visible_builtins = decl;
2652 /* Possibly apply some default attributes to this built-in function. */
2654 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2656 decl_attributes (&decl, NULL_TREE, 0);
2661 /* Called when a declaration is seen that contains no names to declare.
2662 If its type is a reference to a structure, union or enum inherited
2663 from a containing scope, shadow that tag name for the current scope
2664 with a forward reference.
2665 If its type defines a new named structure or union
2666 or defines an enum, it is valid but we need not do anything here.
2667 Otherwise, it is an error. */
2670 shadow_tag (const struct c_declspecs *declspecs)
2672 shadow_tag_warned (declspecs, 0);
2675 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2678 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2680 bool found_tag = false;
2682 pending_invalid_xref = 0;
2684 if (declspecs->type && !declspecs->typedef_p)
2686 tree value = declspecs->type;
2687 enum tree_code code = TREE_CODE (value);
2689 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2690 /* Used to test also that TYPE_SIZE (value) != 0.
2691 That caused warning for `struct foo;' at top level in the file. */
2693 tree name = TYPE_NAME (value);
2700 if (warned != 1 && code != ENUMERAL_TYPE)
2701 /* Empty unnamed enum OK */
2703 pedwarn ("unnamed struct/union that defines no instances");
2709 t = lookup_tag (code, name, 1);
2713 t = make_node (code);
2720 if (warned != 1 && !in_system_header)
2722 pedwarn ("useless type name in empty declaration");
2727 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2729 pedwarn ("useless type name in empty declaration");
2733 if (found_tag && (declspecs->specbits & ((1 << (int) RID_LONG)
2734 | (1 << (int) RID_SHORT)
2735 | (1 << (int) RID_UNSIGNED)
2736 | (1 << (int) RID_SIGNED)
2737 | (1 << (int) RID_COMPLEX))))
2739 error ("long, short, signed, unsigned or complex used invalidly "
2740 "in empty declaration");
2744 if (declspecs->inline_p)
2746 error ("%<inline%> in empty declaration");
2750 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2752 error ("%<auto%> in file-scope empty declaration");
2756 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2758 error ("%<register%> in file-scope empty declaration");
2762 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2764 warning ("useless storage class specifier in empty declaration");
2768 if (!warned && !in_system_header && declspecs->thread_p)
2770 warning ("useless %<__thread%> in empty declaration");
2774 if (!warned && !in_system_header && declspecs->specbits)
2776 warning ("useless keyword or type name in empty declaration");
2783 pedwarn ("empty declaration");
2787 /* Construct an array declarator. EXPR is the expression inside [], or
2788 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2789 to the pointer to which a parameter array is converted). STATIC_P is
2790 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2791 is true if the array is [*], a VLA of unspecified length which is
2792 nevertheless a complete type (not currently implemented by GCC),
2793 false otherwise. The field for the contained declarator is left to be
2794 filled in by set_array_declarator_inner. */
2796 struct c_declarator *
2797 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
2800 struct c_declarator *declarator = XOBNEW (&parser_obstack,
2801 struct c_declarator);
2802 declarator->kind = cdk_array;
2803 declarator->declarator = 0;
2804 declarator->u.array.dimen = expr;
2805 declarator->u.array.quals = quals;
2806 declarator->u.array.static_p = static_p;
2807 declarator->u.array.vla_unspec_p = vla_unspec_p;
2808 if (pedantic && !flag_isoc99)
2810 if (static_p || quals != NULL)
2811 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2813 pedwarn ("ISO C90 does not support `[*]' array declarators");
2816 warning ("GCC does not yet properly implement `[*]' array declarators");
2820 /* Set the contained declarator of an array declarator. DECL is the
2821 declarator, as constructed by build_array_declarator; INNER is what
2822 appears on the left of the []. ABSTRACT_P is true if it is an
2823 abstract declarator, false otherwise; this is used to reject static
2824 and type qualifiers in abstract declarators, where they are not in
2825 the C99 grammar (subject to possible change in DR#289). */
2827 struct c_declarator *
2828 set_array_declarator_inner (struct c_declarator *decl,
2829 struct c_declarator *inner, bool abstract_p)
2831 decl->declarator = inner;
2832 if (abstract_p && (decl->u.array.quals != NULL
2833 || decl->u.array.static_p))
2834 error ("static or type qualifiers in abstract declarator");
2838 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2841 groktypename (struct c_type_name *type_name)
2844 tree attrs = type_name->specs->attrs;
2846 type_name->specs->attrs = NULL_TREE;
2848 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
2851 /* Apply attributes. */
2852 decl_attributes (&type, attrs, 0);
2857 /* Decode a declarator in an ordinary declaration or data definition.
2858 This is called as soon as the type information and variable name
2859 have been parsed, before parsing the initializer if any.
2860 Here we create the ..._DECL node, fill in its type,
2861 and put it on the list of decls for the current context.
2862 The ..._DECL node is returned as the value.
2864 Exception: for arrays where the length is not specified,
2865 the type is left null, to be filled in by `finish_decl'.
2867 Function definitions do not come here; they go to start_function
2868 instead. However, external and forward declarations of functions
2869 do go through here. Structure field declarations are done by
2870 grokfield and not through here. */
2873 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
2874 bool initialized, tree attributes)
2879 /* An object declared as __attribute__((deprecated)) suppresses
2880 warnings of uses of other deprecated items. */
2881 if (lookup_attribute ("deprecated", attributes))
2882 deprecated_state = DEPRECATED_SUPPRESS;
2884 decl = grokdeclarator (declarator, declspecs,
2885 NORMAL, initialized, NULL);
2887 deprecated_state = DEPRECATED_NORMAL;
2889 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2890 && MAIN_NAME_P (DECL_NAME (decl)))
2891 warning ("%J'%D' is usually a function", decl, decl);
2894 /* Is it valid for this decl to have an initializer at all?
2895 If not, set INITIALIZED to zero, which will indirectly
2896 tell 'finish_decl' to ignore the initializer once it is parsed. */
2897 switch (TREE_CODE (decl))
2900 error ("typedef '%D' is initialized (use __typeof__ instead)", decl);
2905 error ("function '%D' is initialized like a variable", decl);
2910 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2911 error ("parameter '%D' is initialized", decl);
2916 /* Don't allow initializations for incomplete types except for
2917 arrays which might be completed by the initialization. */
2919 /* This can happen if the array size is an undefined macro.
2920 We already gave a warning, so we don't need another one. */
2921 if (TREE_TYPE (decl) == error_mark_node)
2923 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2925 /* A complete type is ok if size is fixed. */
2927 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2928 || C_DECL_VARIABLE_SIZE (decl))
2930 error ("variable-sized object may not be initialized");
2934 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2936 error ("variable '%D' has initializer but incomplete type", decl);
2939 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2941 error ("elements of array '%D' have incomplete type", decl);
2948 if (current_scope == file_scope)
2949 TREE_STATIC (decl) = 1;
2951 /* Tell 'pushdecl' this is an initialized decl
2952 even though we don't yet have the initializer expression.
2953 Also tell 'finish_decl' it may store the real initializer. */
2954 DECL_INITIAL (decl) = error_mark_node;
2957 /* If this is a function declaration, write a record describing it to the
2958 prototypes file (if requested). */
2960 if (TREE_CODE (decl) == FUNCTION_DECL)
2961 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2963 /* ANSI specifies that a tentative definition which is not merged with
2964 a non-tentative definition behaves exactly like a definition with an
2965 initializer equal to zero. (Section 3.7.2)
2967 -fno-common gives strict ANSI behavior, though this tends to break
2968 a large body of code that grew up without this rule.
2970 Thread-local variables are never common, since there's no entrenched
2971 body of code to break, and it allows more efficient variable references
2972 in the presence of dynamic linking. */
2974 if (TREE_CODE (decl) == VAR_DECL
2976 && TREE_PUBLIC (decl)
2977 && !DECL_THREAD_LOCAL (decl)
2979 DECL_COMMON (decl) = 1;
2981 /* Set attributes here so if duplicate decl, will have proper attributes. */
2982 decl_attributes (&decl, attributes, 0);
2984 if (TREE_CODE (decl) == FUNCTION_DECL
2985 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2987 struct c_declarator *ce = declarator;
2989 if (ce->kind == cdk_pointer)
2990 ce = declarator->declarator;
2991 if (ce->kind == cdk_function)
2993 tree args = ce->u.arg_info->parms;
2994 for (; args; args = TREE_CHAIN (args))
2996 tree type = TREE_TYPE (args);
2997 if (type && INTEGRAL_TYPE_P (type)
2998 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2999 DECL_ARG_TYPE (args) = integer_type_node;
3004 if (TREE_CODE (decl) == FUNCTION_DECL
3005 && DECL_DECLARED_INLINE_P (decl)
3006 && DECL_UNINLINABLE (decl)
3007 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3008 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
3010 /* Add this decl to the current scope.
3011 TEM may equal DECL or it may be a previous decl of the same name. */
3012 tem = pushdecl (decl);
3015 DECL_EXTERNAL (tem) = 0;
3020 /* Finish processing of a declaration;
3021 install its initial value.
3022 If the length of an array type is not known before,
3023 it must be determined now, from the initial value, or it is an error. */
3026 finish_decl (tree decl, tree init, tree asmspec_tree)
3028 tree type = TREE_TYPE (decl);
3029 int was_incomplete = (DECL_SIZE (decl) == 0);
3030 const char *asmspec = 0;
3032 /* If a name was specified, get the string. */
3033 if (current_scope == file_scope)
3034 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3036 asmspec = TREE_STRING_POINTER (asmspec_tree);
3038 /* If `start_decl' didn't like having an initialization, ignore it now. */
3039 if (init != 0 && DECL_INITIAL (decl) == 0)
3042 /* Don't crash if parm is initialized. */
3043 if (TREE_CODE (decl) == PARM_DECL)
3047 store_init_value (decl, init);
3049 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3050 || TREE_CODE (decl) == FUNCTION_DECL
3051 || TREE_CODE (decl) == FIELD_DECL))
3052 objc_check_decl (decl);
3054 /* Deduce size of array from initialization, if not already known. */
3055 if (TREE_CODE (type) == ARRAY_TYPE
3056 && TYPE_DOMAIN (type) == 0
3057 && TREE_CODE (decl) != TYPE_DECL)
3060 = (TREE_STATIC (decl)
3061 /* Even if pedantic, an external linkage array
3062 may have incomplete type at first. */
3063 ? pedantic && !TREE_PUBLIC (decl)
3064 : !DECL_EXTERNAL (decl));
3066 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3068 /* Get the completed type made by complete_array_type. */
3069 type = TREE_TYPE (decl);
3072 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
3074 else if (failure == 2)
3077 error ("%Jarray size missing in '%D'", decl, decl);
3078 /* If a `static' var's size isn't known,
3079 make it extern as well as static, so it does not get
3081 If it is not `static', then do not mark extern;
3082 finish_incomplete_decl will give it a default size
3083 and it will get allocated. */
3084 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3085 DECL_EXTERNAL (decl) = 1;
3088 /* TYPE_MAX_VALUE is always one less than the number of elements
3089 in the array, because we start counting at zero. Therefore,
3090 warn only if the value is less than zero. */
3091 else if (pedantic && TYPE_DOMAIN (type) != 0
3092 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3093 error ("%Jzero or negative size array '%D'", decl, decl);
3095 layout_decl (decl, 0);
3098 if (TREE_CODE (decl) == VAR_DECL)
3100 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3101 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3102 layout_decl (decl, 0);
3104 if (DECL_SIZE (decl) == 0
3105 /* Don't give an error if we already gave one earlier. */
3106 && TREE_TYPE (decl) != error_mark_node
3107 && (TREE_STATIC (decl)
3108 /* A static variable with an incomplete type
3109 is an error if it is initialized.
3110 Also if it is not file scope.
3111 Otherwise, let it through, but if it is not `extern'
3112 then it may cause an error message later. */
3113 ? (DECL_INITIAL (decl) != 0
3114 || !DECL_FILE_SCOPE_P (decl))
3115 /* An automatic variable with an incomplete type
3117 : !DECL_EXTERNAL (decl)))
3119 error ("%Jstorage size of '%D' isn't known", decl, decl);
3120 TREE_TYPE (decl) = error_mark_node;
3123 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3124 && DECL_SIZE (decl) != 0)
3126 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3127 constant_expression_warning (DECL_SIZE (decl));
3129 error ("%Jstorage size of '%D' isn't constant", decl, decl);
3132 if (TREE_USED (type))
3133 TREE_USED (decl) = 1;
3136 /* If this is a function and an assembler name is specified, reset DECL_RTL
3137 so we can give it its new name. Also, update built_in_decls if it
3138 was a normal built-in. */
3139 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3141 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3143 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
3144 set_user_assembler_name (builtin, asmspec);
3145 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
3146 init_block_move_fn (asmspec);
3147 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
3148 init_block_clear_fn (asmspec);
3150 set_user_assembler_name (decl, asmspec);
3153 /* If #pragma weak was used, mark the decl weak now. */
3154 if (current_scope == file_scope)
3155 maybe_apply_pragma_weak (decl);
3157 /* If this is a variable definition, determine its ELF visibility. */
3158 if (TREE_CODE (decl) == VAR_DECL
3159 && TREE_STATIC (decl)
3160 && !DECL_EXTERNAL (decl))
3161 c_determine_visibility (decl);
3163 /* Output the assembler code and/or RTL code for variables and functions,
3164 unless the type is an undefined structure or union.
3165 If not, it will get done when the type is completed. */
3167 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3169 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3170 if (c_dialect_objc ())
3171 objc_check_decl (decl);
3175 /* If this is not a static variable, issue a warning.
3176 It doesn't make any sense to give an ASMSPEC for an
3177 ordinary, non-register local variable. Historically,
3178 GCC has accepted -- but ignored -- the ASMSPEC in
3180 if (! DECL_FILE_SCOPE_P (decl)
3181 && TREE_CODE (decl) == VAR_DECL
3182 && !C_DECL_REGISTER (decl)
3183 && !TREE_STATIC (decl))
3184 warning ("%Jignoring asm-specifier for non-static local "
3185 "variable '%D'", decl, decl);
3186 else if (C_DECL_REGISTER (decl))
3187 change_decl_assembler_name (decl, get_identifier (asmspec));
3189 set_user_assembler_name (decl, asmspec);
3192 if (DECL_FILE_SCOPE_P (decl))
3194 if (DECL_INITIAL (decl) == NULL_TREE
3195 || DECL_INITIAL (decl) == error_mark_node)
3196 /* Don't output anything
3197 when a tentative file-scope definition is seen.
3198 But at end of compilation, do output code for them. */
3199 DECL_DEFER_OUTPUT (decl) = 1;
3200 rest_of_decl_compilation (decl, true, 0);
3204 /* In conjunction with an ASMSPEC, the `register'
3205 keyword indicates that we should place the variable
3206 in a particular register. */
3207 if (asmspec && C_DECL_REGISTER (decl))
3209 DECL_HARD_REGISTER (decl) = 1;
3210 /* This cannot be done for a structure with volatile
3211 fields, on which DECL_REGISTER will have been
3213 if (!DECL_REGISTER (decl))
3214 error ("cannot put object with volatile field into register");
3217 if (TREE_CODE (decl) != FUNCTION_DECL)
3219 /* If we're building a variable sized type, and we might be
3220 reachable other than via the top of the current binding
3221 level, then create a new BIND_EXPR so that we deallocate
3222 the object at the right time. */
3223 /* Note that DECL_SIZE can be null due to errors. */
3224 if (DECL_SIZE (decl)
3225 && !TREE_CONSTANT (DECL_SIZE (decl))
3226 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3229 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3230 TREE_SIDE_EFFECTS (bind) = 1;
3232 BIND_EXPR_BODY (bind) = push_stmt_list ();
3234 add_stmt (build_stmt (DECL_EXPR, decl));
3239 if (!DECL_FILE_SCOPE_P (decl))
3241 /* Recompute the RTL of a local array now
3242 if it used to be an incomplete type. */
3244 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3246 /* If we used it already as memory, it must stay in memory. */
3247 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3248 /* If it's still incomplete now, no init will save it. */
3249 if (DECL_SIZE (decl) == 0)
3250 DECL_INITIAL (decl) = 0;
3255 /* If this was marked 'used', be sure it will be output. */
3256 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3257 mark_decl_referenced (decl);
3259 if (TREE_CODE (decl) == TYPE_DECL)
3261 if (!DECL_FILE_SCOPE_P (decl)
3262 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3263 add_stmt (build_stmt (DECL_EXPR, decl));
3265 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3268 /* At the end of a declaration, throw away any variable type sizes
3269 of types defined inside that declaration. There is no use
3270 computing them in the following function definition. */
3271 if (current_scope == file_scope)
3272 get_pending_sizes ();
3274 /* Install a cleanup (aka destructor) if one was given. */
3275 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3277 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3280 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3281 tree cleanup_decl = lookup_name (cleanup_id);
3284 /* Build "cleanup(&decl)" for the destructor. */
3285 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3286 cleanup = build_tree_list (NULL_TREE, cleanup);
3287 cleanup = build_function_call (cleanup_decl, cleanup);
3289 /* Don't warn about decl unused; the cleanup uses it. */
3290 TREE_USED (decl) = 1;
3291 TREE_USED (cleanup_decl) = 1;
3293 /* Initialize EH, if we've been told to do so. */
3294 if (flag_exceptions && !c_eh_initialized_p)
3296 c_eh_initialized_p = true;
3297 eh_personality_libfunc
3298 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3299 ? "__gcc_personality_sj0"
3300 : "__gcc_personality_v0");
3301 using_eh_for_cleanups ();
3304 push_cleanup (decl, cleanup, false);
3309 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3312 grokparm (const struct c_parm *parm)
3314 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3317 decl_attributes (&decl, parm->attrs, 0);
3322 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3323 and push that on the current scope. */
3326 push_parm_decl (const struct c_parm *parm)
3330 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3331 decl_attributes (&decl, parm->attrs, 0);
3333 decl = pushdecl (decl);
3335 finish_decl (decl, NULL_TREE, NULL_TREE);
3338 /* Mark all the parameter declarations to date as forward decls.
3339 Also diagnose use of this extension. */
3342 mark_forward_parm_decls (void)
3344 struct c_binding *b;
3346 if (pedantic && !current_scope->warned_forward_parm_decls)
3348 pedwarn ("ISO C forbids forward parameter declarations");
3349 current_scope->warned_forward_parm_decls = true;
3352 for (b = current_scope->bindings; b; b = b->prev)
3353 if (TREE_CODE (b->decl) == PARM_DECL)
3354 TREE_ASM_WRITTEN (b->decl) = 1;
3357 static GTY(()) int compound_literal_number;
3359 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3360 literal, which may be an incomplete array type completed by the
3361 initializer; INIT is a CONSTRUCTOR that initializes the compound
3365 build_compound_literal (tree type, tree init)
3367 /* We do not use start_decl here because we have a type, not a declarator;
3368 and do not use finish_decl because the decl should be stored inside
3369 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3370 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3373 DECL_EXTERNAL (decl) = 0;
3374 TREE_PUBLIC (decl) = 0;
3375 TREE_STATIC (decl) = (current_scope == file_scope);
3376 DECL_CONTEXT (decl) = current_function_decl;
3377 TREE_USED (decl) = 1;
3378 TREE_TYPE (decl) = type;
3379 TREE_READONLY (decl) = TYPE_READONLY (type);
3380 store_init_value (decl, init);
3382 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3384 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3386 gcc_assert (!failure);
3389 type = TREE_TYPE (decl);
3390 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3391 return error_mark_node;
3393 stmt = build_stmt (DECL_EXPR, decl);
3394 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3395 TREE_SIDE_EFFECTS (complit) = 1;
3397 layout_decl (decl, 0);
3399 if (TREE_STATIC (decl))
3401 /* This decl needs a name for the assembler output. We also need
3402 a unique suffix to be added to the name. */
3405 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3406 compound_literal_number);
3407 compound_literal_number++;
3408 DECL_NAME (decl) = get_identifier (name);
3409 DECL_DEFER_OUTPUT (decl) = 1;
3410 DECL_COMDAT (decl) = 1;
3411 DECL_ARTIFICIAL (decl) = 1;
3413 rest_of_decl_compilation (decl, 1, 0);
3419 /* Make TYPE a complete type based on INITIAL_VALUE.
3420 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3421 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3424 complete_array_type (tree type, tree initial_value, int do_default)
3426 tree maxindex = NULL_TREE;
3431 /* Note MAXINDEX is really the maximum index,
3432 one less than the size. */
3433 if (TREE_CODE (initial_value) == STRING_CST)
3436 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3437 maxindex = build_int_cst (NULL_TREE,
3438 (TREE_STRING_LENGTH (initial_value)
3441 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3443 tree elts = CONSTRUCTOR_ELTS (initial_value);
3444 maxindex = build_int_cst (NULL_TREE, -1);
3445 for (; elts; elts = TREE_CHAIN (elts))
3447 if (TREE_PURPOSE (elts))
3448 maxindex = TREE_PURPOSE (elts);
3450 maxindex = fold (build2 (PLUS_EXPR, integer_type_node,
3451 maxindex, integer_one_node));
3456 /* Make an error message unless that happened already. */
3457 if (initial_value != error_mark_node)
3460 /* Prevent further error messages. */
3461 maxindex = build_int_cst (NULL_TREE, 0);
3468 maxindex = build_int_cst (NULL_TREE, 0);
3474 TYPE_DOMAIN (type) = build_index_type (maxindex);
3476 gcc_assert (TREE_TYPE (maxindex));
3479 /* Lay out the type now that we can get the real answer. */
3486 /* Determine whether TYPE is a structure with a flexible array member,
3487 or a union containing such a structure (possibly recursively). */
3490 flexible_array_type_p (tree type)
3493 switch (TREE_CODE (type))
3496 x = TYPE_FIELDS (type);
3499 while (TREE_CHAIN (x) != NULL_TREE)
3501 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3502 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3503 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3504 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3508 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3510 if (flexible_array_type_p (TREE_TYPE (x)))
3519 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3520 replacing with appropriate values if they are invalid. */
3522 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3525 unsigned int max_width;
3526 unsigned HOST_WIDE_INT w;
3527 const char *name = orig_name ? orig_name: _("<anonymous>");
3530 STRIP_NOPS (*width);
3532 /* Detect and ignore out of range field width and process valid
3534 if (TREE_CODE (*width) != INTEGER_CST)
3536 error ("bit-field `%s' width not an integer constant", name);
3537 *width = integer_one_node;
3541 constant_expression_warning (*width);
3542 if (tree_int_cst_sgn (*width) < 0)
3544 error ("negative width in bit-field `%s'", name);
3545 *width = integer_one_node;
3547 else if (integer_zerop (*width) && orig_name)
3549 error ("zero width for bit-field `%s'", name);
3550 *width = integer_one_node;
3554 /* Detect invalid bit-field type. */
3555 if (TREE_CODE (*type) != INTEGER_TYPE
3556 && TREE_CODE (*type) != BOOLEAN_TYPE
3557 && TREE_CODE (*type) != ENUMERAL_TYPE)
3559 error ("bit-field `%s' has invalid type", name);
3560 *type = unsigned_type_node;
3563 type_mv = TYPE_MAIN_VARIANT (*type);
3565 && type_mv != integer_type_node
3566 && type_mv != unsigned_type_node
3567 && type_mv != boolean_type_node)
3568 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3570 if (type_mv == boolean_type_node)
3571 max_width = CHAR_TYPE_SIZE;
3573 max_width = TYPE_PRECISION (*type);
3575 if (0 < compare_tree_int (*width, max_width))
3577 error ("width of `%s' exceeds its type", name);
3579 *width = build_int_cst (NULL_TREE, w);
3582 w = tree_low_cst (*width, 1);
3584 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3586 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3588 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3589 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3590 warning ("`%s' is narrower than values of its type", name);
3594 /* Given declspecs and a declarator,
3595 determine the name and type of the object declared
3596 and construct a ..._DECL node for it.
3597 (In one case we can return a ..._TYPE node instead.
3598 For invalid input we sometimes return 0.)
3600 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3602 DECL_CONTEXT says which syntactic context this declaration is in:
3603 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3604 FUNCDEF for a function definition. Like NORMAL but a few different
3605 error messages in each case. Return value may be zero meaning
3606 this definition is too screwy to try to parse.
3607 PARM for a parameter declaration (either within a function prototype
3608 or before a function body). Make a PARM_DECL, or return void_type_node.
3609 TYPENAME if for a typename (in a cast or sizeof).
3610 Don't make a DECL node; just return the ..._TYPE node.
3611 FIELD for a struct or union field; make a FIELD_DECL.
3612 INITIALIZED is true if the decl has an initializer.
3613 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3614 representing the width of the bit-field.
3616 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3617 It may also be so in the PARM case, for a prototype where the
3618 argument type is specified but not the name.
3620 This function is where the complicated C meanings of `static'
3621 and `extern' are interpreted. */
3624 grokdeclarator (const struct c_declarator *declarator,
3625 struct c_declspecs *declspecs,
3626 enum decl_context decl_context, bool initialized, tree *width)
3628 int specbits = declspecs->specbits;
3629 tree type = declspecs->type;
3630 bool threadp = declspecs->thread_p;
3631 enum c_storage_class storage_class = declspecs->storage_class;
3635 int type_quals = TYPE_UNQUALIFIED;
3636 int defaulted_int = 0;
3637 const char *name, *orig_name;
3638 tree typedef_type = 0;
3639 int funcdef_flag = 0;
3640 bool funcdef_syntax = false;
3641 int size_varies = 0;
3642 tree decl_attr = NULL_TREE;
3643 struct c_declspecs *array_ptr_quals = 0;
3644 int array_parm_static = 0;
3645 tree returned_attrs = NULL_TREE;
3646 bool bitfield = width != NULL;
3648 struct c_arg_info *arg_info = 0;
3650 if (decl_context == FUNCDEF)
3651 funcdef_flag = 1, decl_context = NORMAL;
3653 /* Look inside a declarator for the name being declared
3654 and get it as a string, for an error message. */
3656 const struct c_declarator *decl = declarator;
3665 funcdef_syntax = (decl->kind == cdk_function);
3666 decl = decl->declarator;
3670 decl = decl->declarator;
3675 name = IDENTIFIER_POINTER (decl->u.id);
3687 /* A function definition's declarator must have the form of
3688 a function declarator. */
3690 if (funcdef_flag && !funcdef_syntax)
3693 /* If this looks like a function definition, make it one,
3694 even if it occurs where parms are expected.
3695 Then store_parm_decls will reject it and not use it as a parm. */
3696 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3697 decl_context = PARM;
3699 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3700 warn_deprecated_use (declspecs->type);
3702 typedef_type = type;
3704 size_varies = C_TYPE_VARIABLE_SIZE (type);
3706 /* No type at all: default to `int', and set DEFAULTED_INT
3707 because it was not a user-defined typedef. */
3711 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3712 | (1 << (int) RID_SIGNED)
3713 | (1 << (int) RID_UNSIGNED)
3714 | (1 << (int) RID_COMPLEX))))
3715 /* Don't warn about typedef foo = bar. */
3716 && ! (storage_class == csc_typedef && initialized)
3717 && ! in_system_header)
3719 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3720 and this is a function, or if -Wimplicit; prefer the former
3721 warning since it is more explicit. */
3722 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3724 warn_about_return_type = 1;
3725 else if (warn_implicit_int || flag_isoc99)
3726 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3731 type = integer_type_node;
3734 /* Now process the modifiers that were specified
3735 and check for invalid combinations. */
3737 /* Long double is a special combination. */
3739 if ((specbits & 1 << (int) RID_LONG) && ! declspecs->long_long_p
3740 && TYPE_MAIN_VARIANT (type) == double_type_node)
3742 specbits &= ~(1 << (int) RID_LONG);
3743 type = long_double_type_node;
3746 /* Check all other uses of type modifiers. */
3748 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3749 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3753 if ((specbits & 1 << (int) RID_LONG)
3754 && (specbits & 1 << (int) RID_SHORT))
3755 error ("both long and short specified for `%s'", name);
3756 else if (((specbits & 1 << (int) RID_LONG)
3757 || (specbits & 1 << (int) RID_SHORT))
3758 && declspecs->explicit_char_p)
3759 error ("long or short specified with char for `%s'", name);
3760 else if (((specbits & 1 << (int) RID_LONG)
3761 || (specbits & 1 << (int) RID_SHORT))
3762 && TREE_CODE (type) == REAL_TYPE)
3764 static int already = 0;
3766 error ("long or short specified with floating type for `%s'", name);
3767 if (! already && ! pedantic)
3769 error ("the only valid combination is `long double'");
3773 else if ((specbits & 1 << (int) RID_SIGNED)
3774 && (specbits & 1 << (int) RID_UNSIGNED))
3775 error ("both signed and unsigned specified for `%s'", name);
3776 else if (TREE_CODE (type) != INTEGER_TYPE)
3777 error ("long, short, signed or unsigned invalid for `%s'", name);
3781 if (!declspecs->explicit_int_p && !defaulted_int
3782 && !declspecs->explicit_char_p)
3784 error ("long, short, signed or unsigned used invalidly for `%s'",
3790 /* Discard the type modifiers if they are invalid. */
3793 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3794 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3795 declspecs->long_long_p = 0;
3799 if ((specbits & (1 << (int) RID_COMPLEX))
3800 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3802 error ("complex invalid for `%s'", name);
3803 specbits &= ~(1 << (int) RID_COMPLEX);
3806 /* Decide whether an integer type is signed or not.
3807 Optionally treat bit-fields as signed by default. */
3808 if (specbits & 1 << (int) RID_UNSIGNED
3809 || (bitfield && ! flag_signed_bitfields
3810 && (declspecs->explicit_int_p || defaulted_int
3811 || declspecs->explicit_char_p
3812 /* A typedef for plain `int' without `signed'
3813 can be controlled just like plain `int'. */
3814 || !declspecs->typedef_signed_p)
3815 && TREE_CODE (type) != ENUMERAL_TYPE
3816 && !(specbits & 1 << (int) RID_SIGNED)))
3818 if (declspecs->long_long_p)
3819 type = long_long_unsigned_type_node;
3820 else if (specbits & 1 << (int) RID_LONG)
3821 type = long_unsigned_type_node;
3822 else if (specbits & 1 << (int) RID_SHORT)
3823 type = short_unsigned_type_node;
3824 else if (type == char_type_node)
3825 type = unsigned_char_type_node;
3826 else if (declspecs->typedef_p)
3827 type = c_common_unsigned_type (type);
3829 type = unsigned_type_node;
3831 else if ((specbits & 1 << (int) RID_SIGNED)
3832 && type == char_type_node)
3833 type = signed_char_type_node;
3834 else if (declspecs->long_long_p)
3835 type = long_long_integer_type_node;
3836 else if (specbits & 1 << (int) RID_LONG)
3837 type = long_integer_type_node;
3838 else if (specbits & 1 << (int) RID_SHORT)
3839 type = short_integer_type_node;
3841 if (specbits & 1 << (int) RID_COMPLEX)
3843 if (pedantic && !flag_isoc99)
3844 pedwarn ("ISO C90 does not support complex types");
3845 /* If we just have "complex", it is equivalent to
3846 "complex double", but if any modifiers at all are specified it is
3847 the complex form of TYPE. E.g, "complex short" is
3848 "complex short int". */
3850 if (defaulted_int && ! declspecs->long_long_p
3851 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3852 | (1 << (int) RID_SIGNED)
3853 | (1 << (int) RID_UNSIGNED))))
3856 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3857 type = complex_double_type_node;
3859 else if (type == integer_type_node)
3862 pedwarn ("ISO C does not support complex integer types");
3863 type = complex_integer_type_node;
3865 else if (type == float_type_node)
3866 type = complex_float_type_node;
3867 else if (type == double_type_node)
3868 type = complex_double_type_node;
3869 else if (type == long_double_type_node)
3870 type = complex_long_double_type_node;
3874 pedwarn ("ISO C does not support complex integer types");
3875 type = build_complex_type (type);
3879 /* Check the type and width of a bit-field. */
3881 check_bitfield_type_and_width (&type, width, orig_name);
3883 /* Figure out the type qualifiers for the declaration. There are
3884 two ways a declaration can become qualified. One is something
3885 like `const int i' where the `const' is explicit. Another is
3886 something like `typedef const int CI; CI i' where the type of the
3887 declaration contains the `const'. A third possibility is that
3888 there is a type qualifier on the element type of a typedefed
3889 array type, in which case we should extract that qualifier so
3890 that c_apply_type_quals_to_decls receives the full list of
3891 qualifiers to work with (C90 is not entirely clear about whether
3892 duplicate qualifiers should be diagnosed in this case, but it
3893 seems most appropriate to do so). */
3894 element_type = strip_array_types (type);
3895 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3897 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3899 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3900 if (pedantic && !flag_isoc99)
3903 pedwarn ("duplicate `const'");
3905 pedwarn ("duplicate `restrict'");
3907 pedwarn ("duplicate `volatile'");
3909 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3910 type = TYPE_MAIN_VARIANT (type);
3911 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3912 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3913 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3915 /* Warn about storage classes that are invalid for certain
3916 kinds of declarations (parameters, typenames, etc.). */
3920 || storage_class == csc_auto
3921 || storage_class == csc_register
3922 || storage_class == csc_typedef))
3924 if (storage_class == csc_auto
3925 && (pedantic || current_scope == file_scope))
3926 pedwarn ("function definition declared %<auto%>");
3927 if (storage_class == csc_register)
3928 error ("function definition declared %<register%>");
3929 if (storage_class == csc_typedef)
3930 error ("function definition declared %<typedef%>");
3932 error ("function definition declared %<__thread%>");
3934 if (storage_class == csc_auto
3935 || storage_class == csc_register
3936 || storage_class == csc_typedef)
3937 storage_class = csc_none;
3939 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
3941 if (decl_context == PARM && storage_class == csc_register)
3945 switch (decl_context)
3948 error ("storage class specified for structure field %qs",
3952 error ("storage class specified for parameter %qs", name);
3955 error ("storage class specified for typename");
3958 storage_class = csc_none;
3962 else if (storage_class == csc_extern
3966 /* 'extern' with initialization is invalid if not at file scope. */
3967 if (current_scope == file_scope)
3968 warning ("%qs initialized and declared %<extern%>", name);
3970 error ("%qs has both %<extern%> and initializer", name);
3972 else if (current_scope == file_scope)
3974 if (storage_class == csc_auto)
3975 error ("file-scope declaration of `%s' specifies `auto'", name);
3976 if (pedantic && storage_class == csc_register)
3977 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
3981 if (storage_class == csc_extern && funcdef_flag)
3982 error ("nested function `%s' declared `extern'", name);
3983 else if (threadp && storage_class == csc_none)
3985 error ("function-scope %qs implicitly auto and declared "
3992 /* Now figure out the structure of the declarator proper.
3993 Descend through it, creating more complex types, until we reach
3994 the declared identifier (or NULL_TREE, in an absolute declarator). */
3996 while (declarator && declarator->kind != cdk_id)
3998 if (type == error_mark_node)
4000 declarator = declarator->declarator;
4004 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4005 a cdk_pointer (for *...),
4006 a cdk_function (for ...(...)),
4007 a cdk_attrs (for nested attributes),
4008 or a cdk_id (for the name being declared
4009 or the place in an absolute declarator
4010 where the name was omitted).
4011 For the last case, we have just exited the loop.
4013 At this point, TYPE is the type of elements of an array,
4014 or for a function to return, or for a pointer to point to.
4015 After this sequence of ifs, TYPE is the type of the
4016 array or function or pointer, and DECLARATOR has had its
4017 outermost layer removed. */
4019 if (array_ptr_quals != NULL || array_parm_static)
4021 /* Only the innermost declarator (making a parameter be of
4022 array type which is converted to pointer type)
4023 may have static or type qualifiers. */
4024 error ("static or type qualifiers in non-parameter array declarator");
4025 array_ptr_quals = NULL;
4026 array_parm_static = 0;
4029 switch (declarator->kind)
4033 /* A declarator with embedded attributes. */
4034 tree attrs = declarator->u.attrs;
4035 const struct c_declarator *inner_decl;
4037 declarator = declarator->declarator;
4038 inner_decl = declarator;
4039 while (inner_decl->kind == cdk_attrs)
4040 inner_decl = inner_decl->declarator;
4041 if (inner_decl->kind == cdk_id)
4042 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4043 else if (inner_decl->kind == cdk_function)
4044 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4045 else if (inner_decl->kind == cdk_array)
4046 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4047 returned_attrs = decl_attributes (&type,
4048 chainon (returned_attrs, attrs),
4054 tree itype = NULL_TREE;
4055 tree size = declarator->u.array.dimen;
4056 /* The index is a signed object `sizetype' bits wide. */
4057 tree index_type = c_common_signed_type (sizetype);
4059 array_ptr_quals = declarator->u.array.quals;
4060 array_parm_static = declarator->u.array.static_p;
4062 declarator = declarator->declarator;
4064 /* Check for some types that there cannot be arrays of. */
4066 if (VOID_TYPE_P (type))
4068 error ("declaration of `%s' as array of voids", name);
4069 type = error_mark_node;
4072 if (TREE_CODE (type) == FUNCTION_TYPE)
4074 error ("declaration of `%s' as array of functions", name);
4075 type = error_mark_node;
4078 if (pedantic && !in_system_header && flexible_array_type_p (type))
4079 pedwarn ("invalid use of structure with flexible array member");
4081 if (size == error_mark_node)
4082 type = error_mark_node;
4084 if (type == error_mark_node)
4087 /* If size was specified, set ITYPE to a range-type for
4088 that size. Otherwise, ITYPE remains null. finish_decl
4089 may figure it out from an initial value. */
4093 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4095 STRIP_TYPE_NOPS (size);
4097 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4099 error ("size of array `%s' has non-integer type", name);
4100 size = integer_one_node;
4103 if (pedantic && integer_zerop (size))
4104 pedwarn ("ISO C forbids zero-size array `%s'", name);
4106 if (TREE_CODE (size) == INTEGER_CST)
4108 constant_expression_warning (size);
4109 if (tree_int_cst_sgn (size) < 0)
4111 error ("size of array `%s' is negative", name);
4112 size = integer_one_node;
4117 /* Make sure the array size remains visibly
4118 nonconstant even if it is (eg) a const variable
4119 with known value. */
4122 if (!flag_isoc99 && pedantic)
4124 if (TREE_CONSTANT (size))
4125 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
4128 pedwarn ("ISO C90 forbids variable-size array `%s'",
4133 if (integer_zerop (size))
4135 /* A zero-length array cannot be represented with
4136 an unsigned index type, which is what we'll
4137 get with build_index_type. Create an
4138 open-ended range instead. */
4139 itype = build_range_type (sizetype, size, NULL_TREE);
4143 /* Compute the maximum valid index, that is, size
4144 - 1. Do the calculation in index_type, so that
4145 if it is a variable the computations will be
4146 done in the proper mode. */
4147 itype = fold (build2 (MINUS_EXPR, index_type,
4148 convert (index_type, size),
4149 convert (index_type,
4152 /* If that overflowed, the array is too big. ???
4153 While a size of INT_MAX+1 technically shouldn't
4154 cause an overflow (because we subtract 1), the
4155 overflow is recorded during the conversion to
4156 index_type, before the subtraction. Handling
4157 this case seems like an unnecessary
4159 if (TREE_OVERFLOW (itype))
4161 error ("size of array `%s' is too large", name);
4162 type = error_mark_node;
4167 itype = variable_size (itype);
4168 itype = build_index_type (itype);
4171 else if (decl_context == FIELD)
4173 if (pedantic && !flag_isoc99 && !in_system_header)
4174 pedwarn ("ISO C90 does not support flexible array members");
4176 /* ISO C99 Flexible array members are effectively
4177 identical to GCC's zero-length array extension. */
4178 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4181 /* If pedantic, complain about arrays of incomplete types. */
4182 if (pedantic && !COMPLETE_TYPE_P (type))
4183 pedwarn ("array type has incomplete element type");
4185 /* Build the array type itself, then merge any constancy
4186 or volatility into the target type. We must do it in
4187 this order to ensure that the TYPE_MAIN_VARIANT field
4188 of the array type is set correctly. */
4189 type = build_array_type (type, itype);
4191 type = c_build_qualified_type (type, type_quals);
4194 C_TYPE_VARIABLE_SIZE (type) = 1;
4196 /* The GCC extension for zero-length arrays differs from
4197 ISO flexible array members in that sizeof yields
4199 if (size && integer_zerop (size))
4202 TYPE_SIZE (type) = bitsize_zero_node;
4203 TYPE_SIZE_UNIT (type) = size_zero_node;
4205 else if (declarator->kind == cdk_pointer)
4206 /* We can never complete an array type which is the
4207 target of a pointer, so go ahead and lay it out. */
4210 if (decl_context != PARM
4211 && (array_ptr_quals != NULL || array_parm_static))
4213 error ("static or type qualifiers in non-parameter array declarator");
4214 array_ptr_quals = NULL;
4215 array_parm_static = 0;
4221 /* Say it's a definition only for the declarator closest
4222 to the identifier, apart possibly from some
4224 bool really_funcdef = false;
4228 const struct c_declarator *t = declarator->declarator;
4229 while (t->kind == cdk_attrs)
4231 really_funcdef = (t->kind == cdk_id);
4234 /* Declaring a function type. Make sure we have a valid
4235 type for the function to return. */
4236 if (type == error_mark_node)
4241 /* Warn about some types functions can't return. */
4242 if (TREE_CODE (type) == FUNCTION_TYPE)
4244 error ("`%s' declared as function returning a function", name);
4245 type = integer_type_node;
4247 if (TREE_CODE (type) == ARRAY_TYPE)
4249 error ("`%s' declared as function returning an array", name);
4250 type = integer_type_node;
4253 /* Construct the function type and go to the next
4254 inner layer of declarator. */
4255 arg_info = declarator->u.arg_info;
4256 arg_types = grokparms (arg_info, really_funcdef);
4258 /* Type qualifiers before the return type of the function
4259 qualify the return type, not the function type. */
4262 /* Type qualifiers on a function return type are
4263 normally permitted by the standard but have no
4264 effect, so give a warning at -Wreturn-type.
4265 Qualifiers on a void return type are banned on
4266 function definitions in ISO C; GCC used to used
4267 them for noreturn functions. */
4268 if (VOID_TYPE_P (type) && really_funcdef)
4269 pedwarn ("function definition has qualified void return type");
4270 else if (warn_return_type)
4271 warning ("type qualifiers ignored on function return type");
4273 type = c_build_qualified_type (type, type_quals);
4275 type_quals = TYPE_UNQUALIFIED;
4277 type = build_function_type (type, arg_types);
4278 declarator = declarator->declarator;
4280 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4281 the formal parameter list of this FUNCTION_TYPE to point to
4282 the FUNCTION_TYPE node itself. */
4286 for (link = arg_info->tags;
4288 link = TREE_CHAIN (link))
4289 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4295 /* Merge any constancy or volatility into the target type
4298 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4300 pedwarn ("ISO C forbids qualified function types");
4302 type = c_build_qualified_type (type, type_quals);
4303 type_quals = TYPE_UNQUALIFIED;
4306 type = build_pointer_type (type);
4308 /* Process type qualifiers (such as const or volatile)
4309 that were given inside the `*'. */
4310 if (declarator->u.pointer_quals)
4312 int pbits = declarator->u.pointer_quals->specbits;
4314 /* The grammar should only permit qualifiers here. */
4315 gcc_assert (!declarator->u.pointer_quals->type
4316 && !(pbits & ~((1 << (int) RID_CONST)
4317 | (1 << (int) RID_VOLATILE)
4318 | (1 << (int) RID_RESTRICT))));
4320 constp = !!(pbits & (1 << (int) RID_CONST));
4321 volatilep = !!(pbits & (1 << (int) RID_VOLATILE));
4322 restrictp = !!(pbits & (1 << (int) RID_RESTRICT));
4324 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4325 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4326 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4329 declarator = declarator->declarator;
4337 /* Now TYPE has the actual type. */
4339 /* Did array size calculations overflow? */
4341 if (TREE_CODE (type) == ARRAY_TYPE
4342 && COMPLETE_TYPE_P (type)
4343 && TREE_OVERFLOW (TYPE_SIZE (type)))
4345 error ("size of array `%s' is too large", name);
4346 /* If we proceed with the array type as it is, we'll eventually
4347 crash in tree_low_cst(). */
4348 type = error_mark_node;
4351 /* If this is declaring a typedef name, return a TYPE_DECL. */
4353 if (storage_class == csc_typedef)
4356 /* Note that the grammar rejects storage classes
4357 in typenames, fields or parameters */
4358 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4360 pedwarn ("ISO C forbids qualified function types");
4362 type = c_build_qualified_type (type, type_quals);
4363 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4364 if ((specbits & (1 << (int) RID_SIGNED))
4365 || declspecs->typedef_signed_p)
4366 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4367 decl_attributes (&decl, returned_attrs, 0);
4371 /* Detect the case of an array type of unspecified size
4372 which came, as such, direct from a typedef name.
4373 We must copy the type, so that each identifier gets
4374 a distinct type, so that each identifier's size can be
4375 controlled separately by its own initializer. */
4377 if (type != 0 && typedef_type != 0
4378 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4379 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4381 type = build_array_type (TREE_TYPE (type), 0);
4383 C_TYPE_VARIABLE_SIZE (type) = 1;
4386 /* If this is a type name (such as, in a cast or sizeof),
4387 compute the type and return it now. */
4389 if (decl_context == TYPENAME)
4391 /* Note that the grammar rejects storage classes
4392 in typenames, fields or parameters */
4393 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4395 pedwarn ("ISO C forbids const or volatile function types");
4397 type = c_build_qualified_type (type, type_quals);
4398 decl_attributes (&type, returned_attrs, 0);
4402 /* Aside from typedefs and type names (handle above),
4403 `void' at top level (not within pointer)
4404 is allowed only in public variables.
4405 We don't complain about parms either, but that is because
4406 a better error message can be made later. */
4408 if (VOID_TYPE_P (type) && decl_context != PARM
4409 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4410 && (storage_class == csc_extern
4411 || (current_scope == file_scope
4412 && !(storage_class == csc_static
4413 || storage_class == csc_register)))))
4415 error ("variable or field `%s' declared void", name);
4416 type = integer_type_node;
4419 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4420 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4425 if (decl_context == PARM)
4427 tree type_as_written;
4430 /* A parameter declared as an array of T is really a pointer to T.
4431 One declared as a function is really a pointer to a function. */
4433 if (TREE_CODE (type) == ARRAY_TYPE)
4435 /* Transfer const-ness of array into that of type pointed to. */
4436 type = TREE_TYPE (type);
4438 type = c_build_qualified_type (type, type_quals);
4439 type = build_pointer_type (type);
4440 type_quals = TYPE_UNQUALIFIED;
4441 if (array_ptr_quals)
4443 int apqbits = array_ptr_quals->specbits;
4445 /* We don't yet implement attributes in this context. */
4446 if (array_ptr_quals->attrs != NULL_TREE)
4447 warning ("attributes in parameter array declarator ignored");
4449 /* The grammar should only permit qualifiers here. */
4450 gcc_assert (!array_ptr_quals->type
4451 && !(apqbits & ~((1 << (int) RID_CONST)
4452 | (1 << (int) RID_VOLATILE)
4453 | (1 << (int) RID_RESTRICT))));
4455 constp = !!(apqbits & (1 << (int) RID_CONST));
4456 volatilep = !!(apqbits & (1 << (int) RID_VOLATILE));
4457 restrictp = !!(apqbits & (1 << (int) RID_RESTRICT));
4459 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4460 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4461 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4465 else if (TREE_CODE (type) == FUNCTION_TYPE)
4467 if (pedantic && type_quals)
4468 pedwarn ("ISO C forbids qualified function types");
4470 type = c_build_qualified_type (type, type_quals);
4471 type = build_pointer_type (type);
4472 type_quals = TYPE_UNQUALIFIED;
4474 else if (type_quals)
4475 type = c_build_qualified_type (type, type_quals);
4477 type_as_written = type;
4479 decl = build_decl (PARM_DECL, declarator->u.id, type);
4481 C_DECL_VARIABLE_SIZE (decl) = 1;
4483 /* Compute the type actually passed in the parmlist,
4484 for the case where there is no prototype.
4485 (For example, shorts and chars are passed as ints.)
4486 When there is a prototype, this is overridden later. */
4488 if (type == error_mark_node)
4489 promoted_type = type;
4491 promoted_type = c_type_promotes_to (type);
4493 DECL_ARG_TYPE (decl) = promoted_type;
4494 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4496 else if (decl_context == FIELD)
4498 /* Structure field. It may not be a function. */
4500 if (TREE_CODE (type) == FUNCTION_TYPE)
4502 error ("field `%s' declared as a function", name);
4503 type = build_pointer_type (type);
4505 else if (TREE_CODE (type) != ERROR_MARK
4506 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4508 error ("field `%s' has incomplete type", name);
4509 type = error_mark_node;
4511 /* Move type qualifiers down to element of an array. */
4512 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4513 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4515 TYPE_DOMAIN (type));
4516 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4517 DECL_NONADDRESSABLE_P (decl) = bitfield;
4520 C_DECL_VARIABLE_SIZE (decl) = 1;
4522 else if (TREE_CODE (type) == FUNCTION_TYPE)
4524 if (storage_class == csc_register || threadp)
4525 error ("invalid storage class for function `%s'", name);
4526 else if (current_scope != file_scope)
4528 /* Function declaration not at file scope. Storage
4529 classes other than `extern' are not allowed, C99
4530 6.7.1p5, and `extern' makes no difference. However,
4531 GCC allows 'auto', perhaps with 'inline', to support
4532 nested functions. */
4533 if (storage_class == csc_auto)
4536 pedwarn ("invalid storage class for function `%s'", name);
4538 if (storage_class == csc_static)
4539 error ("invalid storage class for function `%s'", name);
4542 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4543 decl = build_decl_attribute_variant (decl, decl_attr);
4545 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4547 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4548 pedwarn ("ISO C forbids qualified function types");
4550 /* GNU C interprets a volatile-qualified function type to indicate
4551 that the function does not return. */
4552 if ((type_quals & TYPE_QUAL_VOLATILE)
4553 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4554 warning ("`noreturn' function returns non-void value");
4556 /* Every function declaration is an external reference
4557 (DECL_EXTERNAL) except for those which are not at file
4558 scope and are explicitly declared "auto". This is
4559 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4560 GCC to signify a forward declaration of a nested function. */
4561 if (storage_class == csc_auto && current_scope != file_scope)
4562 DECL_EXTERNAL (decl) = 0;
4564 DECL_EXTERNAL (decl) = 1;
4566 /* Record absence of global scope for `static' or `auto'. */
4568 = !(storage_class == csc_static || storage_class == csc_auto);
4570 /* For a function definition, record the argument information
4571 block where store_parm_decls will look for it. */
4573 current_function_arg_info = arg_info;
4576 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4578 /* Record presence of `inline', if it is reasonable. */
4579 if (MAIN_NAME_P (declarator->u.id))
4581 if (declspecs->inline_p)
4582 warning ("cannot inline function `main'");
4584 else if (declspecs->inline_p)
4586 /* Record that the function is declared `inline'. */
4587 DECL_DECLARED_INLINE_P (decl) = 1;
4589 /* Do not mark bare declarations as DECL_INLINE. Doing so
4590 in the presence of multiple declarations can result in
4591 the abstract origin pointing between the declarations,
4592 which will confuse dwarf2out. */
4595 DECL_INLINE (decl) = 1;
4596 if (storage_class == csc_extern)
4597 current_extern_inline = 1;
4600 /* If -finline-functions, assume it can be inlined. This does
4601 two things: let the function be deferred until it is actually
4602 needed, and let dwarf2 know that the function is inlinable. */
4603 else if (flag_inline_trees == 2 && initialized)
4604 DECL_INLINE (decl) = 1;
4608 /* It's a variable. */
4609 /* An uninitialized decl with `extern' is a reference. */
4610 int extern_ref = !initialized && storage_class == csc_extern;
4612 /* Move type qualifiers down to element of an array. */
4613 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4615 int saved_align = TYPE_ALIGN(type);
4616 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4618 TYPE_DOMAIN (type));
4619 TYPE_ALIGN (type) = saved_align;
4621 else if (type_quals)
4622 type = c_build_qualified_type (type, type_quals);
4624 /* C99 6.2.2p7: It is invalid (compile-time undefined
4625 behavior) to create an 'extern' declaration for a
4626 variable if there is a global declaration that is
4627 'static' and the global declaration is not visible.
4628 (If the static declaration _is_ currently visible,
4629 the 'extern' declaration is taken to refer to that decl.) */
4630 if (extern_ref && current_scope != file_scope)
4632 tree global_decl = identifier_global_value (declarator->u.id);
4633 tree visible_decl = lookup_name (declarator->u.id);
4636 && global_decl != visible_decl
4637 && TREE_CODE (global_decl) == VAR_DECL
4638 && !TREE_PUBLIC (global_decl))
4639 error ("variable previously declared 'static' redeclared "
4643 decl = build_decl (VAR_DECL, declarator->u.id, type);
4645 C_DECL_VARIABLE_SIZE (decl) = 1;
4647 if (declspecs->inline_p)
4648 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4650 /* At file scope, an initialized extern declaration may follow
4651 a static declaration. In that case, DECL_EXTERNAL will be
4652 reset later in start_decl. */
4653 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4655 /* At file scope, the presence of a `static' or `register' storage
4656 class specifier, or the absence of all storage class specifiers
4657 makes this declaration a definition (perhaps tentative). Also,
4658 the absence of both `static' and `register' makes it public. */
4659 if (current_scope == file_scope)
4661 TREE_PUBLIC (decl) = !(storage_class == csc_static
4662 || storage_class == csc_register);
4663 TREE_STATIC (decl) = !extern_ref;
4665 /* Not at file scope, only `static' makes a static definition. */
4668 TREE_STATIC (decl) = (storage_class == csc_static);
4669 TREE_PUBLIC (decl) = extern_ref;
4674 if (targetm.have_tls)
4675 DECL_THREAD_LOCAL (decl) = 1;
4677 /* A mere warning is sure to result in improper semantics
4678 at runtime. Don't bother to allow this to compile. */
4679 error ("thread-local storage not supported for this target");
4683 /* Record `register' declaration for warnings on &
4684 and in case doing stupid register allocation. */
4686 if (storage_class == csc_register)
4688 C_DECL_REGISTER (decl) = 1;
4689 DECL_REGISTER (decl) = 1;
4692 /* Record constancy and volatility. */
4693 c_apply_type_quals_to_decl (type_quals, decl);
4695 /* If a type has volatile components, it should be stored in memory.
4696 Otherwise, the fact that those components are volatile
4697 will be ignored, and would even crash the compiler. */
4698 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4700 /* It is not an error for a structure with volatile fields to
4701 be declared register, but reset DECL_REGISTER since it
4702 cannot actually go in a register. */
4703 int was_reg = C_DECL_REGISTER (decl);
4704 C_DECL_REGISTER (decl) = 0;
4705 DECL_REGISTER (decl) = 0;
4706 c_mark_addressable (decl);
4707 C_DECL_REGISTER (decl) = was_reg;
4710 /* This is the earliest point at which we might know the assembler
4711 name of a variable. Thus, if it's known before this, die horribly. */
4712 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4714 decl_attributes (&decl, returned_attrs, 0);
4720 /* Decode the parameter-list info for a function type or function definition.
4721 The argument is the value returned by `get_parm_info' (or made in parse.y
4722 if there is an identifier list instead of a parameter decl list).
4723 These two functions are separate because when a function returns
4724 or receives functions then each is called multiple times but the order
4725 of calls is different. The last call to `grokparms' is always the one
4726 that contains the formal parameter names of a function definition.
4728 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4730 FUNCDEF_FLAG is true for a function definition, false for
4731 a mere declaration. A nonempty identifier-list gets an error message
4732 when FUNCDEF_FLAG is false. */
4735 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4737 tree arg_types = arg_info->types;
4739 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4740 && !in_system_header)
4741 warning ("function declaration isn't a prototype");
4743 if (arg_types == error_mark_node)
4744 return 0; /* don't set TYPE_ARG_TYPES in this case */
4746 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4749 pedwarn ("parameter names (without types) in function declaration");
4751 arg_info->parms = arg_info->types;
4752 arg_info->types = 0;
4757 tree parm, type, typelt;
4758 unsigned int parmno;
4760 /* If the arg types are incomplete in a declaration, they must
4761 include undefined tags. These tags can never be defined in
4762 the scope of the declaration, so the types can never be
4763 completed, and no call can be compiled successfully. */
4765 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4767 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4769 type = TREE_VALUE (typelt);
4770 if (type == error_mark_node)
4773 if (!COMPLETE_TYPE_P (type))
4777 if (DECL_NAME (parm))
4778 error ("%Jparameter %u ('%D') has incomplete type",
4779 parm, parmno, parm);
4781 error ("%Jparameter %u has incomplete type",
4784 TREE_VALUE (typelt) = error_mark_node;
4785 TREE_TYPE (parm) = error_mark_node;
4789 if (DECL_NAME (parm))
4790 warning ("%Jparameter %u ('%D') has incomplete type",
4791 parm, parmno, parm);
4793 warning ("%Jparameter %u has incomplete type",
4802 /* Take apart the current scope and return a c_arg_info structure with
4803 info on a parameter list just parsed.
4805 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4807 ELLIPSIS being true means the argument list ended in '...' so don't
4808 append a sentinel (void_list_node) to the end of the type-list. */
4811 get_parm_info (bool ellipsis)
4813 struct c_binding *b = current_scope->bindings;
4814 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4821 static bool explained_incomplete_types = false;
4822 bool gave_void_only_once_err = false;
4824 arg_info->parms = 0;
4826 arg_info->types = 0;
4827 arg_info->others = 0;
4829 /* The bindings in this scope must not get put into a block.
4830 We will take care of deleting the binding nodes. */
4831 current_scope->bindings = 0;
4833 /* This function is only called if there was *something* on the
4837 /* A parameter list consisting solely of 'void' indicates that the
4838 function takes no arguments. But if the 'void' is qualified
4839 (by 'const' or 'volatile'), or has a storage class specifier
4840 ('register'), then the behavior is undefined; issue an error.
4841 Typedefs for 'void' are OK (see DR#157). */
4842 if (b->prev == 0 /* one binding */
4843 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4844 && !DECL_NAME (b->decl) /* anonymous */
4845 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4847 if (TREE_THIS_VOLATILE (b->decl)
4848 || TREE_READONLY (b->decl)
4849 || C_DECL_REGISTER (b->decl))
4850 error ("'void' as only parameter may not be qualified");
4852 /* There cannot be an ellipsis. */
4854 error ("'void' must be the only parameter");
4856 arg_info->types = void_list_node;
4861 types = void_list_node;
4863 /* Break up the bindings list into parms, tags, types, and others;
4864 apply sanity checks; purge the name-to-decl bindings. */
4867 tree decl = b->decl;
4868 tree type = TREE_TYPE (decl);
4869 const char *keyword;
4871 switch (TREE_CODE (decl))
4876 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4877 I_SYMBOL_BINDING (b->id) = b->shadowed;
4880 /* Check for forward decls that never got their actual decl. */
4881 if (TREE_ASM_WRITTEN (decl))
4882 error ("%Jparameter '%D' has just a forward declaration",
4884 /* Check for (..., void, ...) and issue an error. */
4885 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4887 if (!gave_void_only_once_err)
4889 error ("'void' must be the only parameter");
4890 gave_void_only_once_err = true;
4895 /* Valid parameter, add it to the list. */
4896 TREE_CHAIN (decl) = parms;
4899 /* Since there is a prototype, args are passed in their
4900 declared types. The back end may override this later. */
4901 DECL_ARG_TYPE (decl) = type;
4902 types = tree_cons (0, type, types);
4906 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4907 case UNION_TYPE: keyword = "union"; goto tag;
4908 case RECORD_TYPE: keyword = "struct"; goto tag;
4910 /* Types may not have tag-names, in which case the type
4911 appears in the bindings list with b->id NULL. */
4914 gcc_assert (I_TAG_BINDING (b->id) == b);
4915 I_TAG_BINDING (b->id) = b->shadowed;
4918 /* Warn about any struct, union or enum tags defined in a
4919 parameter list. The scope of such types is limited to
4920 the parameter list, which is rarely if ever desirable
4921 (it's impossible to call such a function with type-
4922 correct arguments). An anonymous union parm type is
4923 meaningful as a GNU extension, so don't warn for that. */
4924 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4927 /* The %s will be one of 'struct', 'union', or 'enum'. */
4928 warning ("'%s %E' declared inside parameter list",
4931 /* The %s will be one of 'struct', 'union', or 'enum'. */
4932 warning ("anonymous %s declared inside parameter list",
4935 if (! explained_incomplete_types)
4937 warning ("its scope is only this definition or declaration,"
4938 " which is probably not what you want");
4939 explained_incomplete_types = true;
4943 tags = tree_cons (b->id, decl, tags);
4948 /* CONST_DECLs appear here when we have an embedded enum,
4949 and TYPE_DECLs appear here when we have an embedded struct
4950 or union. No warnings for this - we already warned about the
4952 TREE_CHAIN (decl) = others;
4957 /* error_mark_node appears here when we have an undeclared
4958 variable. Just throw it away. */
4961 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4962 I_SYMBOL_BINDING (b->id) = b->shadowed;
4966 /* Other things that might be encountered. */
4974 b = free_binding_and_advance (b);
4977 arg_info->parms = parms;
4978 arg_info->tags = tags;
4979 arg_info->types = types;
4980 arg_info->others = others;
4984 /* Get the struct, enum or union (CODE says which) with tag NAME.
4985 Define the tag as a forward-reference if it is not defined. */
4988 xref_tag (enum tree_code code, tree name)
4990 /* If a cross reference is requested, look up the type
4991 already defined for this tag and return it. */
4993 tree ref = lookup_tag (code, name, 0);
4994 /* If this is the right type of tag, return what we found.
4995 (This reference will be shadowed by shadow_tag later if appropriate.)
4996 If this is the wrong type of tag, do not return it. If it was the
4997 wrong type in the same scope, we will have had an error
4998 message already; if in a different scope and declaring
4999 a name, pending_xref_error will give an error message; but if in a
5000 different scope and not declaring a name, this tag should
5001 shadow the previous declaration of a different type of tag, and
5002 this would not work properly if we return the reference found.
5003 (For example, with "struct foo" in an outer scope, "union foo;"
5004 must shadow that tag with a new one of union type.) */
5005 if (ref && TREE_CODE (ref) == code)
5008 /* If no such tag is yet defined, create a forward-reference node
5009 and record it as the "definition".
5010 When a real declaration of this type is found,
5011 the forward-reference will be altered into a real type. */
5013 ref = make_node (code);
5014 if (code == ENUMERAL_TYPE)
5016 /* Give the type a default layout like unsigned int
5017 to avoid crashing if it does not get defined. */
5018 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5019 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5020 TYPE_USER_ALIGN (ref) = 0;
5021 TYPE_UNSIGNED (ref) = 1;
5022 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5023 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5024 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5027 pushtag (name, ref);
5032 /* Make sure that the tag NAME is defined *in the current scope*
5033 at least as a forward reference.
5034 CODE says which kind of tag NAME ought to be. */
5037 start_struct (enum tree_code code, tree name)
5039 /* If there is already a tag defined at this scope
5040 (as a forward reference), just return it. */
5045 ref = lookup_tag (code, name, 1);
5046 if (ref && TREE_CODE (ref) == code)
5048 if (TYPE_FIELDS (ref))
5050 if (code == UNION_TYPE)
5051 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
5053 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
5058 /* Otherwise create a forward-reference just so the tag is in scope. */
5060 ref = make_node (code);
5061 pushtag (name, ref);
5064 C_TYPE_BEING_DEFINED (ref) = 1;
5065 TYPE_PACKED (ref) = flag_pack_struct;
5069 /* Process the specs, declarator and width (NULL if omitted)
5070 of a structure component, returning a FIELD_DECL node.
5071 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5073 This is done during the parsing of the struct declaration.
5074 The FIELD_DECL nodes are chained together and the lot of them
5075 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5078 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5083 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5084 && width == NULL_TREE)
5086 /* This is an unnamed decl.
5088 If we have something of the form "union { list } ;" then this
5089 is the anonymous union extension. Similarly for struct.
5091 If this is something of the form "struct foo;", then
5092 If MS extensions are enabled, this is handled as an
5094 Otherwise this is a forward declaration of a structure tag.
5096 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5097 If MS extensions are enabled and foo names a structure, then
5098 again this is an anonymous struct.
5099 Otherwise this is an error.
5101 Oh what a horrid tangled web we weave. I wonder if MS consciously
5102 took this from Plan 9 or if it was an accident of implementation
5103 that took root before someone noticed the bug... */
5105 tree type = declspecs->type;
5108 && (TREE_CODE (type) == RECORD_TYPE
5109 || TREE_CODE (type) == UNION_TYPE)
5110 && (flag_ms_extensions || !declspecs->typedef_p))
5112 if (flag_ms_extensions)
5115 goto warn_unnamed_field;
5116 else if (TYPE_NAME (type) == NULL)
5119 goto warn_unnamed_field;
5124 warning ("declaration does not declare anything");
5129 value = grokdeclarator (declarator, declspecs, FIELD, false,
5130 width ? &width : NULL);
5132 finish_decl (value, NULL_TREE, NULL_TREE);
5133 DECL_INITIAL (value) = width;
5138 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5139 the list such that this does not present a problem later. */
5142 detect_field_duplicates (tree fieldlist)
5147 /* First, see if there are more than "a few" fields.
5148 This is trivially true if there are zero or one fields. */
5151 x = TREE_CHAIN (fieldlist);
5157 } while (timeout > 0 && x);
5159 /* If there were "few" fields, avoid the overhead of allocating
5160 a hash table. Instead just do the nested traversal thing. */
5163 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5166 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5167 if (DECL_NAME (y) == DECL_NAME (x))
5169 error ("%Jduplicate member '%D'", x, x);
5170 DECL_NAME (x) = NULL_TREE;
5176 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5179 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5180 if ((y = DECL_NAME (x)) != 0)
5182 slot = htab_find_slot (htab, y, INSERT);
5185 error ("%Jduplicate member '%D'", x, x);
5186 DECL_NAME (x) = NULL_TREE;
5195 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5196 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5197 ATTRIBUTES are attributes to be applied to the structure. */
5200 finish_struct (tree t, tree fieldlist, tree attributes)
5203 bool toplevel = file_scope == current_scope;
5204 int saw_named_field;
5206 /* If this type was previously laid out as a forward reference,
5207 make sure we lay it out again. */
5211 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5215 for (x = fieldlist; x; x = TREE_CHAIN (x))
5216 if (DECL_NAME (x) != 0)
5220 pedwarn ("%s has no %s",
5221 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5222 fieldlist ? _("named members") : _("members"));
5225 /* Install struct as DECL_CONTEXT of each field decl.
5226 Also process specified field sizes, found in the DECL_INITIAL,
5227 storing 0 there after the type has been changed to precision equal
5228 to its width, rather than the precision of the specified standard
5229 type. (Correct layout requires the original type to have been preserved
5232 saw_named_field = 0;
5233 for (x = fieldlist; x; x = TREE_CHAIN (x))
5235 DECL_CONTEXT (x) = t;
5236 DECL_PACKED (x) |= TYPE_PACKED (t);
5238 /* If any field is const, the structure type is pseudo-const. */
5239 if (TREE_READONLY (x))
5240 C_TYPE_FIELDS_READONLY (t) = 1;
5243 /* A field that is pseudo-const makes the structure likewise. */
5244 tree t1 = TREE_TYPE (x);
5245 while (TREE_CODE (t1) == ARRAY_TYPE)
5246 t1 = TREE_TYPE (t1);
5247 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5248 && C_TYPE_FIELDS_READONLY (t1))
5249 C_TYPE_FIELDS_READONLY (t) = 1;
5252 /* Any field that is volatile means variables of this type must be
5253 treated in some ways as volatile. */
5254 if (TREE_THIS_VOLATILE (x))
5255 C_TYPE_FIELDS_VOLATILE (t) = 1;
5257 /* Any field of nominal variable size implies structure is too. */
5258 if (C_DECL_VARIABLE_SIZE (x))
5259 C_TYPE_VARIABLE_SIZE (t) = 1;
5261 /* Detect invalid nested redefinition. */
5262 if (TREE_TYPE (x) == t)
5263 error ("nested redefinition of `%s'",
5264 IDENTIFIER_POINTER (TYPE_NAME (t)));
5266 if (DECL_INITIAL (x))
5268 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5269 DECL_SIZE (x) = bitsize_int (width);
5270 DECL_BIT_FIELD (x) = 1;
5271 SET_DECL_C_BIT_FIELD (x);
5274 /* Detect flexible array member in an invalid context. */
5275 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5276 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5277 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5278 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5280 if (TREE_CODE (t) == UNION_TYPE)
5282 error ("%Jflexible array member in union", x);
5283 TREE_TYPE (x) = error_mark_node;
5285 else if (TREE_CHAIN (x) != NULL_TREE)
5287 error ("%Jflexible array member not at end of struct", x);
5288 TREE_TYPE (x) = error_mark_node;
5290 else if (! saw_named_field)
5292 error ("%Jflexible array member in otherwise empty struct", x);
5293 TREE_TYPE (x) = error_mark_node;
5297 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5298 && flexible_array_type_p (TREE_TYPE (x)))
5299 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5302 saw_named_field = 1;
5305 detect_field_duplicates (fieldlist);
5307 /* Now we have the nearly final fieldlist. Record it,
5308 then lay out the structure or union (including the fields). */
5310 TYPE_FIELDS (t) = fieldlist;
5314 /* Give bit-fields their proper types. */
5316 tree *fieldlistp = &fieldlist;
5318 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5319 && TREE_TYPE (*fieldlistp) != error_mark_node)
5321 unsigned HOST_WIDE_INT width
5322 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5323 tree type = TREE_TYPE (*fieldlistp);
5324 if (width != TYPE_PRECISION (type))
5325 TREE_TYPE (*fieldlistp)
5326 = build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
5327 DECL_INITIAL (*fieldlistp) = 0;
5330 fieldlistp = &TREE_CHAIN (*fieldlistp);
5333 /* Now we have the truly final field list.
5334 Store it in this type and in the variants. */
5336 TYPE_FIELDS (t) = fieldlist;
5338 /* If there are lots of fields, sort so we can look through them fast.
5339 We arbitrarily consider 16 or more elts to be "a lot". */
5344 for (x = fieldlist; x; x = TREE_CHAIN (x))
5346 if (len > 15 || DECL_NAME (x) == NULL)
5354 struct lang_type *space;
5355 struct sorted_fields_type *space2;
5357 len += list_length (x);
5359 /* Use the same allocation policy here that make_node uses, to
5360 ensure that this lives as long as the rest of the struct decl.
5361 All decls in an inline function need to be saved. */
5363 space = GGC_CNEW (struct lang_type);
5364 space2 = GGC_NEWVAR (struct sorted_fields_type,
5365 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5369 field_array = &space2->elts[0];
5370 for (x = fieldlist; x; x = TREE_CHAIN (x))
5372 field_array[len++] = x;
5374 /* If there is anonymous struct or union, break out of the loop. */
5375 if (DECL_NAME (x) == NULL)
5378 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5381 TYPE_LANG_SPECIFIC (t) = space;
5382 TYPE_LANG_SPECIFIC (t)->s->len = len;
5383 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5384 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5389 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5391 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5392 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5393 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5394 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5397 /* If this was supposed to be a transparent union, but we can't
5398 make it one, warn and turn off the flag. */
5399 if (TREE_CODE (t) == UNION_TYPE
5400 && TYPE_TRANSPARENT_UNION (t)
5401 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5403 TYPE_TRANSPARENT_UNION (t) = 0;
5404 warning ("union cannot be made transparent");
5407 /* If this structure or union completes the type of any previous
5408 variable declaration, lay it out and output its rtl. */
5409 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5413 tree decl = TREE_VALUE (x);
5414 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5415 layout_array_type (TREE_TYPE (decl));
5416 if (TREE_CODE (decl) != TYPE_DECL)
5418 layout_decl (decl, 0);
5419 if (c_dialect_objc ())
5420 objc_check_decl (decl);
5421 rest_of_decl_compilation (decl, toplevel, 0);
5426 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5428 /* Finish debugging output for this type. */
5429 rest_of_type_compilation (t, toplevel);
5434 /* Lay out the type T, and its element type, and so on. */
5437 layout_array_type (tree t)
5439 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5440 layout_array_type (TREE_TYPE (t));
5444 /* Begin compiling the definition of an enumeration type.
5445 NAME is its name (or null if anonymous).
5446 Returns the type object, as yet incomplete.
5447 Also records info about it so that build_enumerator
5448 may be used to declare the individual values as they are read. */
5451 start_enum (tree name)
5455 /* If this is the real definition for a previous forward reference,
5456 fill in the contents in the same object that used to be the
5457 forward reference. */
5460 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5462 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5464 enumtype = make_node (ENUMERAL_TYPE);
5465 pushtag (name, enumtype);
5468 C_TYPE_BEING_DEFINED (enumtype) = 1;
5470 if (TYPE_VALUES (enumtype) != 0)
5472 /* This enum is a named one that has been declared already. */
5473 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5475 /* Completely replace its old definition.
5476 The old enumerators remain defined, however. */
5477 TYPE_VALUES (enumtype) = 0;
5480 enum_next_value = integer_zero_node;
5483 if (flag_short_enums)
5484 TYPE_PACKED (enumtype) = 1;
5489 /* After processing and defining all the values of an enumeration type,
5490 install their decls in the enumeration type and finish it off.
5491 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5492 and ATTRIBUTES are the specified attributes.
5493 Returns ENUMTYPE. */
5496 finish_enum (tree enumtype, tree values, tree attributes)
5499 tree minnode = 0, maxnode = 0;
5500 int precision, unsign;
5501 bool toplevel = (file_scope == current_scope);
5502 struct lang_type *lt;
5504 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5506 /* Calculate the maximum value of any enumerator in this type. */
5508 if (values == error_mark_node)
5509 minnode = maxnode = integer_zero_node;
5512 minnode = maxnode = TREE_VALUE (values);
5513 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5515 tree value = TREE_VALUE (pair);
5516 if (tree_int_cst_lt (maxnode, value))
5518 if (tree_int_cst_lt (value, minnode))
5523 /* Construct the final type of this enumeration. It is the same
5524 as one of the integral types - the narrowest one that fits, except
5525 that normally we only go as narrow as int - and signed iff any of
5526 the values are negative. */
5527 unsign = (tree_int_cst_sgn (minnode) >= 0);
5528 precision = MAX (min_precision (minnode, unsign),
5529 min_precision (maxnode, unsign));
5531 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5533 tem = c_common_type_for_size (precision, unsign);
5536 warning ("enumeration values exceed range of largest integer");
5537 tem = long_long_integer_type_node;
5541 tem = unsign ? unsigned_type_node : integer_type_node;
5543 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5544 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5545 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5546 TYPE_SIZE (enumtype) = 0;
5548 /* If the precision of the type was specific with an attribute and it
5549 was too small, give an error. Otherwise, use it. */
5550 if (TYPE_PRECISION (enumtype))
5552 if (precision > TYPE_PRECISION (enumtype))
5553 error ("specified mode too small for enumeral values");
5556 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5558 layout_type (enumtype);
5560 if (values != error_mark_node)
5562 /* Change the type of the enumerators to be the enum type. We
5563 need to do this irrespective of the size of the enum, for
5564 proper type checking. Replace the DECL_INITIALs of the
5565 enumerators, and the value slots of the list, with copies
5566 that have the enum type; they cannot be modified in place
5567 because they may be shared (e.g. integer_zero_node) Finally,
5568 change the purpose slots to point to the names of the decls. */
5569 for (pair = values; pair; pair = TREE_CHAIN (pair))
5571 tree enu = TREE_PURPOSE (pair);
5572 tree ini = DECL_INITIAL (enu);
5574 TREE_TYPE (enu) = enumtype;
5576 /* The ISO C Standard mandates enumerators to have type int,
5577 even though the underlying type of an enum type is
5578 unspecified. Here we convert any enumerators that fit in
5579 an int to type int, to avoid promotions to unsigned types
5580 when comparing integers with enumerators that fit in the
5581 int range. When -pedantic is given, build_enumerator()
5582 would have already taken care of those that don't fit. */
5583 if (int_fits_type_p (ini, integer_type_node))
5584 tem = integer_type_node;
5587 ini = convert (tem, ini);
5589 DECL_INITIAL (enu) = ini;
5590 TREE_PURPOSE (pair) = DECL_NAME (enu);
5591 TREE_VALUE (pair) = ini;
5594 TYPE_VALUES (enumtype) = values;
5597 /* Record the min/max values so that we can warn about bit-field
5598 enumerations that are too small for the values. */
5599 lt = GGC_CNEW (struct lang_type);
5600 lt->enum_min = minnode;
5601 lt->enum_max = maxnode;
5602 TYPE_LANG_SPECIFIC (enumtype) = lt;
5604 /* Fix up all variant types of this enum type. */
5605 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5607 if (tem == enumtype)
5609 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5610 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5611 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5612 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5613 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5614 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5615 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5616 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5617 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5618 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5619 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5622 /* Finish debugging output for this type. */
5623 rest_of_type_compilation (enumtype, toplevel);
5628 /* Build and install a CONST_DECL for one value of the
5629 current enumeration type (one that was begun with start_enum).
5630 Return a tree-list containing the CONST_DECL and its value.
5631 Assignment of sequential values by default is handled here. */
5634 build_enumerator (tree name, tree value)
5638 /* Validate and default VALUE. */
5640 /* Remove no-op casts from the value. */
5642 STRIP_TYPE_NOPS (value);
5646 /* Don't issue more errors for error_mark_node (i.e. an
5647 undeclared identifier) - just ignore the value expression. */
5648 if (value == error_mark_node)
5650 else if (TREE_CODE (value) != INTEGER_CST)
5652 error ("enumerator value for '%E' is not an integer constant", name);
5657 value = default_conversion (value);
5658 constant_expression_warning (value);
5662 /* Default based on previous value. */
5663 /* It should no longer be possible to have NON_LVALUE_EXPR
5667 value = enum_next_value;
5669 error ("overflow in enumeration values");
5672 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5674 pedwarn ("ISO C restricts enumerator values to range of `int'");
5675 /* XXX This causes -pedantic to change the meaning of the program.
5676 Remove? -zw 2004-03-15 */
5677 value = convert (integer_type_node, value);
5680 /* Set basis for default for next value. */
5681 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5682 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5684 /* Now create a declaration for the enum value name. */
5686 type = TREE_TYPE (value);
5687 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5688 TYPE_PRECISION (integer_type_node)),
5689 (TYPE_PRECISION (type)
5690 >= TYPE_PRECISION (integer_type_node)
5691 && TYPE_UNSIGNED (type)));
5693 decl = build_decl (CONST_DECL, name, type);
5694 DECL_INITIAL (decl) = convert (type, value);
5697 return tree_cons (decl, value, NULL_TREE);
5701 /* Create the FUNCTION_DECL for a function definition.
5702 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5703 the declaration; they describe the function's name and the type it returns,
5704 but twisted together in a fashion that parallels the syntax of C.
5706 This function creates a binding context for the function body
5707 as well as setting up the FUNCTION_DECL in current_function_decl.
5709 Returns 1 on success. If the DECLARATOR is not suitable for a function
5710 (it defines a datum instead), we return 0, which tells
5711 yyparse to report a parse error. */
5714 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5717 tree decl1, old_decl;
5718 tree restype, resdecl;
5720 current_function_returns_value = 0; /* Assume, until we see it does. */
5721 current_function_returns_null = 0;
5722 current_function_returns_abnormally = 0;
5723 warn_about_return_type = 0;
5724 current_extern_inline = 0;
5725 c_switch_stack = NULL;
5727 /* Indicate no valid break/continue context by setting these variables
5728 to some non-null, non-label value. We'll notice and emit the proper
5729 error message in c_finish_bc_stmt. */
5730 c_break_label = c_cont_label = size_zero_node;
5732 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5734 /* If the declarator is not suitable for a function definition,
5735 cause a syntax error. */
5739 decl_attributes (&decl1, attributes, 0);
5741 if (DECL_DECLARED_INLINE_P (decl1)
5742 && DECL_UNINLINABLE (decl1)
5743 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5744 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5746 announce_function (decl1);
5748 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5750 error ("return type is an incomplete type");
5751 /* Make it return void instead. */
5753 = build_function_type (void_type_node,
5754 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5757 if (warn_about_return_type)
5758 pedwarn_c99 ("return type defaults to `int'");
5760 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5761 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5762 DECL_INITIAL (decl1) = error_mark_node;
5764 /* If this definition isn't a prototype and we had a prototype declaration
5765 before, copy the arg type info from that prototype.
5766 But not if what we had before was a builtin function. */
5767 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5768 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5769 && !DECL_BUILT_IN (old_decl)
5770 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5771 TREE_TYPE (TREE_TYPE (old_decl)))
5772 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5774 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5776 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5779 /* Optionally warn of old-fashioned def with no previous prototype. */
5780 if (warn_strict_prototypes
5781 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5782 && C_DECL_ISNT_PROTOTYPE (old_decl))
5783 warning ("function declaration isn't a prototype");
5784 /* Optionally warn of any global def with no previous prototype. */
5785 else if (warn_missing_prototypes
5786 && TREE_PUBLIC (decl1)
5787 && ! MAIN_NAME_P (DECL_NAME (decl1))
5788 && C_DECL_ISNT_PROTOTYPE (old_decl))
5789 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5790 /* Optionally warn of any def with no previous prototype
5791 if the function has already been used. */
5792 else if (warn_missing_prototypes
5793 && old_decl != 0 && TREE_USED (old_decl)
5794 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5795 warning ("%J'%D' was used with no prototype before its definition",
5797 /* Optionally warn of any global def with no previous declaration. */
5798 else if (warn_missing_declarations
5799 && TREE_PUBLIC (decl1)
5801 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5802 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5803 /* Optionally warn of any def with no previous declaration
5804 if the function has already been used. */
5805 else if (warn_missing_declarations
5806 && old_decl != 0 && TREE_USED (old_decl)
5807 && C_DECL_IMPLICIT (old_decl))
5808 warning ("%J`%D' was used with no declaration before its definition",
5811 /* This is a definition, not a reference.
5812 So normally clear DECL_EXTERNAL.
5813 However, `extern inline' acts like a declaration
5814 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5815 DECL_EXTERNAL (decl1) = current_extern_inline;
5817 /* This function exists in static storage.
5818 (This does not mean `static' in the C sense!) */
5819 TREE_STATIC (decl1) = 1;
5821 /* A nested function is not global. */
5822 if (current_function_decl != 0)
5823 TREE_PUBLIC (decl1) = 0;
5825 /* This is the earliest point at which we might know the assembler
5826 name of the function. Thus, if it's set before this, die horribly. */
5827 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5829 /* If #pragma weak was used, mark the decl weak now. */
5830 if (current_scope == file_scope)
5831 maybe_apply_pragma_weak (decl1);
5833 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5834 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5839 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5840 != integer_type_node)
5841 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5843 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5844 args = TREE_CHAIN (args))
5846 tree type = args ? TREE_VALUE (args) : 0;
5848 if (type == void_type_node)
5855 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5856 pedwarn ("%Jfirst argument of '%D' should be `int'",
5861 if (TREE_CODE (type) != POINTER_TYPE
5862 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5863 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5865 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5870 if (TREE_CODE (type) != POINTER_TYPE
5871 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5872 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5874 pedwarn ("%Jthird argument of '%D' should probably be "
5875 "'char **'", decl1, decl1);
5880 /* It is intentional that this message does not mention the third
5881 argument because it's only mentioned in an appendix of the
5883 if (argct > 0 && (argct < 2 || argct > 3))
5884 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5886 if (! TREE_PUBLIC (decl1))
5887 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5890 /* Record the decl so that the function name is defined.
5891 If we already have a decl for this name, and it is a FUNCTION_DECL,
5892 use the old decl. */
5894 current_function_decl = pushdecl (decl1);
5897 declare_parm_level ();
5899 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5900 /* Promote the value to int before returning it. */
5901 if (c_promoting_integer_type_p (restype))
5903 /* It retains unsignedness if not really getting wider. */
5904 if (TYPE_UNSIGNED (restype)
5905 && (TYPE_PRECISION (restype)
5906 == TYPE_PRECISION (integer_type_node)))
5907 restype = unsigned_type_node;
5909 restype = integer_type_node;
5912 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
5913 DECL_ARTIFICIAL (resdecl) = 1;
5914 DECL_IGNORED_P (resdecl) = 1;
5915 DECL_RESULT (current_function_decl) = resdecl;
5917 start_fname_decls ();
5922 /* Subroutine of store_parm_decls which handles new-style function
5923 definitions (prototype format). The parms already have decls, so we
5924 need only record them as in effect and complain if any redundant
5925 old-style parm decls were written. */
5927 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
5931 if (current_scope->bindings)
5933 error ("%Jold-style parameter declarations in prototyped "
5934 "function definition", fndecl);
5936 /* Get rid of the old-style declarations. */
5940 /* Don't issue this warning for nested functions, and don't issue this
5941 warning if we got here because ARG_INFO_TYPES was error_mark_node
5942 (this happens when a function definition has just an ellipsis in
5943 its parameter list). */
5944 else if (warn_traditional && !in_system_header && !current_function_scope
5945 && arg_info->types != error_mark_node)
5946 warning ("%Jtraditional C rejects ISO C style function definitions",
5949 /* Now make all the parameter declarations visible in the function body.
5950 We can bypass most of the grunt work of pushdecl. */
5951 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
5953 DECL_CONTEXT (decl) = current_function_decl;
5954 if (DECL_NAME (decl))
5955 bind (DECL_NAME (decl), decl, current_scope,
5956 /*invisible=*/false, /*nested=*/false);
5958 error ("%Jparameter name omitted", decl);
5961 /* Record the parameter list in the function declaration. */
5962 DECL_ARGUMENTS (fndecl) = arg_info->parms;
5964 /* Now make all the ancillary declarations visible, likewise. */
5965 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
5967 DECL_CONTEXT (decl) = current_function_decl;
5968 if (DECL_NAME (decl))
5969 bind (DECL_NAME (decl), decl, current_scope,
5970 /*invisible=*/false, /*nested=*/false);
5973 /* And all the tag declarations. */
5974 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
5975 if (TREE_PURPOSE (decl))
5976 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
5977 /*invisible=*/false, /*nested=*/false);
5980 /* Subroutine of store_parm_decls which handles old-style function
5981 definitions (separate parameter list and declarations). */
5984 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
5986 struct c_binding *b;
5987 tree parm, decl, last;
5988 tree parmids = arg_info->parms;
5990 /* We use DECL_WEAK as a flag to show which parameters have been
5991 seen already, since it is not used on PARM_DECL. */
5992 #ifdef ENABLE_CHECKING
5993 for (b = current_scope->bindings; b; b = b->prev)
5994 gcc_assert (TREE_CODE (b->decl) != PARM_DECL || !DECL_WEAK (b->decl));
5997 if (warn_old_style_definition && !in_system_header)
5998 warning ("%Jold-style function definition", fndecl);
6000 /* Match each formal parameter name with its declaration. Save each
6001 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6002 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6004 if (TREE_VALUE (parm) == 0)
6006 error ("%Jparameter name missing from parameter list", fndecl);
6007 TREE_PURPOSE (parm) = 0;
6011 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6012 if (b && B_IN_CURRENT_SCOPE (b))
6015 /* If we got something other than a PARM_DECL it is an error. */
6016 if (TREE_CODE (decl) != PARM_DECL)
6017 error ("%J'%D' declared as a non-parameter", decl, decl);
6018 /* If the declaration is already marked, we have a duplicate
6019 name. Complain and ignore the duplicate. */
6020 else if (DECL_WEAK (decl))
6022 error ("%Jmultiple parameters named '%D'", decl, decl);
6023 TREE_PURPOSE (parm) = 0;
6026 /* If the declaration says "void", complain and turn it into
6028 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6030 error ("%Jparameter '%D' declared with void type", decl, decl);
6031 TREE_TYPE (decl) = integer_type_node;
6032 DECL_ARG_TYPE (decl) = integer_type_node;
6033 layout_decl (decl, 0);
6036 /* If no declaration found, default to int. */
6039 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6040 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6041 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6045 pedwarn ("%Jtype of '%D' defaults to 'int'", decl, decl);
6046 else if (extra_warnings)
6047 warning ("%Jtype of '%D' defaults to 'int'", decl, decl);
6050 TREE_PURPOSE (parm) = decl;
6051 DECL_WEAK (decl) = 1;
6054 /* Now examine the parms chain for incomplete declarations
6055 and declarations with no corresponding names. */
6057 for (b = current_scope->bindings; b; b = b->prev)
6060 if (TREE_CODE (parm) != PARM_DECL)
6063 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6065 error ("%Jparameter '%D' has incomplete type", parm, parm);
6066 TREE_TYPE (parm) = error_mark_node;
6069 if (! DECL_WEAK (parm))
6071 error ("%Jdeclaration for parameter '%D' but no such parameter",
6074 /* Pretend the parameter was not missing.
6075 This gets us to a standard state and minimizes
6076 further error messages. */
6077 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6081 /* Chain the declarations together in the order of the list of
6082 names. Store that chain in the function decl, replacing the
6083 list of names. Update the current scope to match. */
6084 DECL_ARGUMENTS (fndecl) = 0;
6086 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6087 if (TREE_PURPOSE (parm))
6089 if (parm && TREE_PURPOSE (parm))
6091 last = TREE_PURPOSE (parm);
6092 DECL_ARGUMENTS (fndecl) = last;
6093 DECL_WEAK (last) = 0;
6095 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6096 if (TREE_PURPOSE (parm))
6098 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6099 last = TREE_PURPOSE (parm);
6100 DECL_WEAK (last) = 0;
6102 TREE_CHAIN (last) = 0;
6105 /* If there was a previous prototype,
6106 set the DECL_ARG_TYPE of each argument according to
6107 the type previously specified, and report any mismatches. */
6109 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6112 for (parm = DECL_ARGUMENTS (fndecl),
6113 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6114 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6115 != void_type_node));
6116 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6118 if (parm == 0 || type == 0
6119 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6121 error ("number of arguments doesn't match prototype");
6122 error ("%Hprototype declaration",
6123 ¤t_function_prototype_locus);
6126 /* Type for passing arg must be consistent with that
6127 declared for the arg. ISO C says we take the unqualified
6128 type for parameters declared with qualified type. */
6129 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6130 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6132 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6133 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6135 /* Adjust argument to match prototype. E.g. a previous
6136 `int foo(float);' prototype causes
6137 `int foo(x) float x; {...}' to be treated like
6138 `int foo(float x) {...}'. This is particularly
6139 useful for argument types like uid_t. */
6140 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6142 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6143 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6144 && TYPE_PRECISION (TREE_TYPE (parm))
6145 < TYPE_PRECISION (integer_type_node))
6146 DECL_ARG_TYPE (parm) = integer_type_node;
6150 pedwarn ("promoted argument '%D' "
6151 "doesn't match prototype", parm);
6152 pedwarn ("%Hprototype declaration",
6153 ¤t_function_prototype_locus);
6158 error ("argument '%D' doesn't match prototype", parm);
6159 error ("%Hprototype declaration",
6160 ¤t_function_prototype_locus);
6164 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6167 /* Otherwise, create a prototype that would match. */
6171 tree actual = 0, last = 0, type;
6173 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6175 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6177 TREE_CHAIN (last) = type;
6182 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6184 TREE_CHAIN (last) = type;
6188 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6189 of the type of this function, but we need to avoid having this
6190 affect the types of other similarly-typed functions, so we must
6191 first force the generation of an identical (but separate) type
6192 node for the relevant function type. The new node we create
6193 will be a variant of the main variant of the original function
6196 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6198 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6202 /* Store parameter declarations passed in ARG_INFO into the current
6203 function declaration. */
6206 store_parm_decls_from (struct c_arg_info *arg_info)
6208 current_function_arg_info = arg_info;
6209 store_parm_decls ();
6212 /* Store the parameter declarations into the current function declaration.
6213 This is called after parsing the parameter declarations, before
6214 digesting the body of the function.
6216 For an old-style definition, construct a prototype out of the old-style
6217 parameter declarations and inject it into the function's type. */
6220 store_parm_decls (void)
6222 tree fndecl = current_function_decl;
6225 /* The argument information block for FNDECL. */
6226 struct c_arg_info *arg_info = current_function_arg_info;
6227 current_function_arg_info = 0;
6229 /* True if this definition is written with a prototype. Note:
6230 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6231 list in a function definition as equivalent to (void) -- an
6232 empty argument list specifies the function has no parameters,
6233 but only (void) sets up a prototype for future calls. */
6234 proto = arg_info->types != 0;
6237 store_parm_decls_newstyle (fndecl, arg_info);
6239 store_parm_decls_oldstyle (fndecl, arg_info);
6241 /* The next call to push_scope will be a function body. */
6243 next_is_function_body = true;
6245 /* Write a record describing this function definition to the prototypes
6246 file (if requested). */
6248 gen_aux_info_record (fndecl, 1, 0, proto);
6250 /* Initialize the RTL code for the function. */
6251 allocate_struct_function (fndecl);
6253 /* Begin the statement tree for this function. */
6254 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6256 /* ??? Insert the contents of the pending sizes list into the function
6257 to be evaluated. This just changes mis-behaviour until assign_parms
6258 phase ordering problems are resolved. */
6261 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6262 add_stmt (TREE_VALUE (t));
6265 /* Even though we're inside a function body, we still don't want to
6266 call expand_expr to calculate the size of a variable-sized array.
6267 We haven't necessarily assigned RTL to all variables yet, so it's
6268 not safe to try to expand expressions involving them. */
6269 cfun->x_dont_save_pending_sizes_p = 1;
6272 /* Give FNDECL and all its nested functions to cgraph for compilation. */
6275 c_finalize (tree fndecl)
6277 struct cgraph_node *cgn;
6279 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6280 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6282 /* ??? Objc emits functions after finalizing the compilation unit.
6283 This should be cleaned up later and this conditional removed. */
6284 if (cgraph_global_info_ready)
6286 c_expand_body (fndecl);
6290 /* Finalize all nested functions now. */
6291 cgn = cgraph_node (fndecl);
6292 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6293 c_finalize (cgn->decl);
6295 cgraph_finalize_function (fndecl, false);
6298 /* Finish up a function declaration and compile that function
6299 all the way to assembler language output. The free the storage
6300 for the function definition.
6302 This is called after parsing the body of the function definition. */
6305 finish_function (void)
6307 tree fndecl = current_function_decl;
6309 if (TREE_CODE (fndecl) == FUNCTION_DECL
6310 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6312 tree args = DECL_ARGUMENTS (fndecl);
6313 for (; args; args = TREE_CHAIN (args))
6315 tree type = TREE_TYPE (args);
6316 if (INTEGRAL_TYPE_P (type)
6317 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6318 DECL_ARG_TYPE (args) = integer_type_node;
6322 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6323 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6325 /* Must mark the RESULT_DECL as being in this function. */
6327 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6328 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6330 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6332 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6333 != integer_type_node)
6335 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6336 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6338 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6343 c_finish_return (integer_zero_node);
6347 /* Tie off the statement tree for this function. */
6348 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6350 finish_fname_decls ();
6352 /* Complain if there's just no return statement. */
6353 if (warn_return_type
6354 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6355 && !current_function_returns_value && !current_function_returns_null
6356 /* Don't complain if we abort. */
6357 && !current_function_returns_abnormally
6358 /* Don't warn for main(). */
6359 && !MAIN_NAME_P (DECL_NAME (fndecl))
6360 /* Or if they didn't actually specify a return type. */
6361 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6362 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6363 inline function, as we might never be compiled separately. */
6364 && DECL_INLINE (fndecl))
6365 warning ("no return statement in function returning non-void");
6367 /* With just -Wextra, complain only if function returns both with
6368 and without a value. */
6370 && current_function_returns_value
6371 && current_function_returns_null)
6372 warning ("this function may return with or without a value");
6374 /* Store the end of the function, so that we get good line number
6375 info for the epilogue. */
6376 cfun->function_end_locus = input_location;
6378 /* If we don't have ctors/dtors sections, and this is a static
6379 constructor or destructor, it must be recorded now. */
6380 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6381 && !targetm.have_ctors_dtors)
6382 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6383 if (DECL_STATIC_DESTRUCTOR (fndecl)
6384 && !targetm.have_ctors_dtors)
6385 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6387 /* Finalize the ELF visibility for the function. */
6388 c_determine_visibility (fndecl);
6390 /* Genericize before inlining. Delay genericizing nested functions
6391 until their parent function is genericized. Since finalizing
6392 requires GENERIC, delay that as well. */
6394 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6396 if (!decl_function_context (fndecl))
6398 c_genericize (fndecl);
6399 lower_nested_functions (fndecl);
6400 c_finalize (fndecl);
6404 /* Register this function with cgraph just far enough to get it
6405 added to our parent's nested function list. Handy, since the
6406 C front end doesn't have such a list. */
6407 (void) cgraph_node (fndecl);
6411 /* We're leaving the context of this function, so zap cfun.
6412 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6413 tree_rest_of_compilation. */
6415 current_function_decl = NULL;
6418 /* Generate the RTL for the body of FNDECL. */
6421 c_expand_body (tree fndecl)
6424 if (!DECL_INITIAL (fndecl)
6425 || DECL_INITIAL (fndecl) == error_mark_node)
6428 tree_rest_of_compilation (fndecl, false);
6430 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6431 && targetm.have_ctors_dtors)
6432 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6433 DEFAULT_INIT_PRIORITY);
6434 if (DECL_STATIC_DESTRUCTOR (fndecl)
6435 && targetm.have_ctors_dtors)
6436 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6437 DEFAULT_INIT_PRIORITY);
6440 /* Check the declarations given in a for-loop for satisfying the C99
6443 check_for_loop_decls (void)
6445 struct c_binding *b;
6449 /* If we get here, declarations have been used in a for loop without
6450 the C99 for loop scope. This doesn't make much sense, so don't
6452 error ("'for' loop initial declaration used outside C99 mode");
6455 /* C99 subclause 6.8.5 paragraph 3:
6457 [#3] The declaration part of a for statement shall only
6458 declare identifiers for objects having storage class auto or
6461 It isn't clear whether, in this sentence, "identifiers" binds to
6462 "shall only declare" or to "objects" - that is, whether all identifiers
6463 declared must be identifiers for objects, or whether the restriction
6464 only applies to those that are. (A question on this in comp.std.c
6465 in November 2000 received no answer.) We implement the strictest
6466 interpretation, to avoid creating an extension which later causes
6469 for (b = current_scope->bindings; b; b = b->prev)
6472 tree decl = b->decl;
6477 switch (TREE_CODE (decl))
6480 if (TREE_STATIC (decl))
6481 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6482 "initial declaration", decl, decl);
6483 else if (DECL_EXTERNAL (decl))
6484 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6485 "initial declaration", decl, decl);
6489 error ("'struct %E' declared in 'for' loop initial declaration", id);
6492 error ("'union %E' declared in 'for' loop initial declaration", id);
6495 error ("'enum %E' declared in 'for' loop initial declaration", id);
6498 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6499 "initial declaration", decl, decl);
6504 /* Save and reinitialize the variables
6505 used during compilation of a C function. */
6508 c_push_function_context (struct function *f)
6510 struct language_function *p;
6511 p = GGC_NEW (struct language_function);
6514 p->base.x_stmt_tree = c_stmt_tree;
6515 p->x_break_label = c_break_label;
6516 p->x_cont_label = c_cont_label;
6517 p->x_switch_stack = c_switch_stack;
6518 p->arg_info = current_function_arg_info;
6519 p->returns_value = current_function_returns_value;
6520 p->returns_null = current_function_returns_null;
6521 p->returns_abnormally = current_function_returns_abnormally;
6522 p->warn_about_return_type = warn_about_return_type;
6523 p->extern_inline = current_extern_inline;
6526 /* Restore the variables used during compilation of a C function. */
6529 c_pop_function_context (struct function *f)
6531 struct language_function *p = f->language;
6533 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6534 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6536 /* Stop pointing to the local nodes about to be freed. */
6537 /* But DECL_INITIAL must remain nonzero so we know this
6538 was an actual function definition. */
6539 DECL_INITIAL (current_function_decl) = error_mark_node;
6540 DECL_ARGUMENTS (current_function_decl) = 0;
6543 c_stmt_tree = p->base.x_stmt_tree;
6544 c_break_label = p->x_break_label;
6545 c_cont_label = p->x_cont_label;
6546 c_switch_stack = p->x_switch_stack;
6547 current_function_arg_info = p->arg_info;
6548 current_function_returns_value = p->returns_value;
6549 current_function_returns_null = p->returns_null;
6550 current_function_returns_abnormally = p->returns_abnormally;
6551 warn_about_return_type = p->warn_about_return_type;
6552 current_extern_inline = p->extern_inline;
6557 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6560 c_dup_lang_specific_decl (tree decl)
6562 struct lang_decl *ld;
6564 if (!DECL_LANG_SPECIFIC (decl))
6567 ld = GGC_NEW (struct lang_decl);
6568 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6569 DECL_LANG_SPECIFIC (decl) = ld;
6572 /* The functions below are required for functionality of doing
6573 function at once processing in the C front end. Currently these
6574 functions are not called from anywhere in the C front end, but as
6575 these changes continue, that will change. */
6577 /* Returns nonzero if the current statement is a full expression,
6578 i.e. temporaries created during that statement should be destroyed
6579 at the end of the statement. */
6582 stmts_are_full_exprs_p (void)
6587 /* Returns the stmt_tree (if any) to which statements are currently
6588 being added. If there is no active statement-tree, NULL is
6592 current_stmt_tree (void)
6594 return &c_stmt_tree;
6597 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6601 anon_aggr_type_p (tree ARG_UNUSED (node))
6606 /* Return the global value of T as a symbol. */
6609 identifier_global_value (tree t)
6611 struct c_binding *b;
6613 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6614 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6620 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6621 otherwise the name is found in ridpointers from RID_INDEX. */
6624 record_builtin_type (enum rid rid_index, const char *name, tree type)
6628 id = ridpointers[(int) rid_index];
6630 id = get_identifier (name);
6631 decl = build_decl (TYPE_DECL, id, type);
6633 if (debug_hooks->type_decl)
6634 debug_hooks->type_decl (decl, false);
6637 /* Build the void_list_node (void_type_node having been created). */
6639 build_void_list_node (void)
6641 tree t = build_tree_list (NULL_TREE, void_type_node);
6645 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6648 build_c_parm (struct c_declspecs *specs, tree attrs,
6649 struct c_declarator *declarator)
6651 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6654 ret->declarator = declarator;
6658 /* Return a declarator with nested attributes. TARGET is the inner
6659 declarator to which these attributes apply. ATTRS are the
6662 struct c_declarator *
6663 build_attrs_declarator (tree attrs, struct c_declarator *target)
6665 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6666 ret->kind = cdk_attrs;
6667 ret->declarator = target;
6668 ret->u.attrs = attrs;
6672 /* Return a declarator for a function with arguments specified by ARGS
6673 and return type specified by TARGET. */
6675 struct c_declarator *
6676 build_function_declarator (struct c_arg_info *args,
6677 struct c_declarator *target)
6679 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6680 ret->kind = cdk_function;
6681 ret->declarator = target;
6682 ret->u.arg_info = args;
6686 /* Return a declarator for the identifier IDENT (which may be
6687 NULL_TREE for an abstract declarator). */
6689 struct c_declarator *
6690 build_id_declarator (tree ident)
6692 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6694 ret->declarator = 0;
6699 /* Return something to represent absolute declarators containing a *.
6700 TARGET is the absolute declarator that the * contains.
6701 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6702 to apply to the pointer type. */
6704 struct c_declarator *
6705 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6706 struct c_declarator *target)
6709 struct c_declarator *itarget = target;
6710 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6711 if (type_quals_attrs)
6713 attrs = type_quals_attrs->attrs;
6714 type_quals_attrs->attrs = NULL_TREE;
6715 if (attrs != NULL_TREE)
6716 itarget = build_attrs_declarator (attrs, target);
6718 ret->kind = cdk_pointer;
6719 ret->declarator = itarget;
6720 ret->u.pointer_quals = type_quals_attrs;
6724 /* Return a pointer to a structure for an empty list of declaration
6727 struct c_declspecs *
6728 build_null_declspecs (void)
6730 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6735 ret->storage_class = csc_none;
6736 ret->non_sc_seen_p = false;
6737 ret->typedef_p = false;
6738 ret->typedef_signed_p = false;
6739 ret->deprecated_p = false;
6740 ret->explicit_int_p = false;
6741 ret->explicit_char_p = false;
6742 ret->long_long_p = false;
6743 ret->inline_p = false;
6744 ret->thread_p = false;
6748 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6751 struct c_declspecs *
6752 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6755 specs->non_sc_seen_p = true;
6756 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6757 && C_IS_RESERVED_WORD (qual));
6758 i = C_RID_CODE (qual);
6759 gcc_assert (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT);
6760 if ((specs->specbits & (1 << (int) i)) && pedantic && !flag_isoc99)
6761 pedwarn ("duplicate %qs", IDENTIFIER_POINTER (qual));
6762 specs->specbits |= 1 << (int) i;
6766 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6769 struct c_declspecs *
6770 declspecs_add_type (struct c_declspecs *specs, tree type)
6772 specs->non_sc_seen_p = true;
6773 if (TREE_DEPRECATED (type))
6774 specs->deprecated_p = true;
6775 if (type == ridpointers[(int) RID_INT])
6776 specs->explicit_int_p = true;
6777 if (type == ridpointers[(int) RID_CHAR])
6778 specs->explicit_char_p = true;
6780 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
6782 enum rid i = C_RID_CODE (type);
6783 if ((int) i <= (int) RID_LAST_MODIFIER)
6785 if (i == RID_LONG && (specs->specbits & (1 << (int) RID_LONG)))
6787 if (specs->long_long_p)
6788 error ("%<long long long%> is too long for GCC");
6791 if (pedantic && !flag_isoc99 && !in_system_header
6793 pedwarn ("ISO C90 does not support %<long long%>");
6794 specs->long_long_p = 1;
6797 else if (specs->specbits & (1 << (int) i))
6798 error ("duplicate %qs", IDENTIFIER_POINTER (type));
6800 specs->specbits |= 1 << (int) i;
6805 error ("two or more data types in declaration specifiers");
6806 /* Actual typedefs come to us as TYPE_DECL nodes. */
6807 else if (TREE_CODE (type) == TYPE_DECL)
6809 if (TREE_TYPE (type) == error_mark_node)
6810 ; /* Allow the type to default to int to avoid cascading errors. */
6813 specs->type = TREE_TYPE (type);
6814 specs->decl_attr = DECL_ATTRIBUTES (type);
6815 specs->typedef_p = true;
6816 specs->typedef_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
6819 /* Built-in types come as identifiers. */
6820 else if (TREE_CODE (type) == IDENTIFIER_NODE)
6822 tree t = lookup_name (type);
6823 if (!t || TREE_CODE (t) != TYPE_DECL)
6824 error ("%qs fails to be a typedef or built in type",
6825 IDENTIFIER_POINTER (type));
6826 else if (TREE_TYPE (t) == error_mark_node)
6829 specs->type = TREE_TYPE (t);
6831 else if (TREE_CODE (type) != ERROR_MARK)
6837 /* Add the storage class specifier or function specifier SCSPEC to the
6838 declaration specifiers SPECS, returning SPECS. */
6840 struct c_declspecs *
6841 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
6844 enum c_storage_class n = csc_none;
6846 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
6847 && C_IS_RESERVED_WORD (scspec));
6848 i = C_RID_CODE (scspec);
6849 if (extra_warnings && specs->non_sc_seen_p)
6850 warning ("%qs is not at beginning of declaration",
6851 IDENTIFIER_POINTER (scspec));
6855 /* GCC has hitherto given an error for duplicate inline, but
6856 this should be revisited since C99 permits duplicate
6858 dupe = specs->inline_p;
6859 specs->inline_p = true;
6862 dupe = specs->thread_p;
6863 if (specs->storage_class == csc_auto)
6864 error ("%<__thread%> used with %<auto%>");
6865 else if (specs->storage_class == csc_register)
6866 error ("%<__thread%> used with %<register%>");
6867 else if (specs->storage_class == csc_typedef)
6868 error ("%<__thread%> used with %<typedef%>");
6870 specs->thread_p = true;
6877 /* Diagnose "__thread extern". */
6878 if (specs->thread_p)
6879 error ("%<__thread%> before %<extern%>");
6886 /* Diagnose "__thread static". */
6887 if (specs->thread_p)
6888 error ("%<__thread%> before %<static%>");
6896 if (n != csc_none && n == specs->storage_class)
6899 error ("duplicate %qs", IDENTIFIER_POINTER (scspec));
6902 if (specs->storage_class != csc_none && n != specs->storage_class)
6904 error ("multiple storage classes in declaration specifiers");
6908 specs->storage_class = n;
6909 if (n != csc_extern && n != csc_static && specs->thread_p)
6911 error ("%<__thread%> used with %qs",
6912 IDENTIFIER_POINTER (scspec));
6913 specs->thread_p = false;
6920 /* Add the attributes ATTRS to the declaration specifiers SPECS,
6923 struct c_declspecs *
6924 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
6926 specs->attrs = chainon (attrs, specs->attrs);
6930 /* Synthesize a function which calls all the global ctors or global
6931 dtors in this file. This is only used for targets which do not
6932 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
6934 build_cdtor (int method_type, tree cdtors)
6941 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
6942 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
6945 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
6948 /* Perform final processing on one file scope's declarations (or the
6949 external scope's declarations), GLOBALS. */
6951 c_write_global_declarations_1 (tree globals)
6953 size_t len = list_length (globals);
6954 tree *vec = XNEWVEC (tree, len);
6958 /* Process the decls in the order they were written. */
6959 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6962 /* Check for used but undefined static functions using the C
6963 standard's definition of "used", and set TREE_NO_WARNING so
6964 that check_global_declarations doesn't repeat the check. */
6965 if (TREE_CODE (decl) == FUNCTION_DECL
6966 && DECL_INITIAL (decl) == 0
6967 && DECL_EXTERNAL (decl)
6968 && !TREE_PUBLIC (decl)
6969 && C_DECL_USED (decl))
6971 pedwarn ("%J%<%F%> used but never defined", decl, decl);
6972 TREE_NO_WARNING (decl) = 1;
6976 wrapup_global_declarations (vec, len);
6977 check_global_declarations (vec, len);
6983 c_write_global_declarations (void)
6987 /* We don't want to do this if generating a PCH. */
6991 /* Don't waste time on further processing if -fsyntax-only or we've
6992 encountered errors. */
6993 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
6996 /* Close the external scope. */
6997 ext_block = pop_scope ();
6999 gcc_assert (!current_scope);
7001 /* Process all file scopes in this compilation, and the external_scope,
7002 through wrapup_global_declarations and check_global_declarations. */
7003 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7004 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7005 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7007 /* Generate functions to call static constructors and destructors
7008 for targets that do not support .ctors/.dtors sections. These
7009 functions have magic names which are detected by collect2. */
7010 build_cdtor ('I', static_ctors); static_ctors = 0;
7011 build_cdtor ('D', static_dtors); static_dtors = 0;
7013 /* We're done parsing; proceed to optimize and emit assembly.
7014 FIXME: shouldn't be the front end's responsibility to call this. */
7017 /* Presently this has to happen after cgraph_optimize.
7018 FIXME: shouldn't be the front end's responsibility to call this. */
7020 mudflap_finish_file ();
7023 #include "gt-c-decl.h"