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 /* These #defines are for clarity in working with the information block
95 returned by get_parm_info. */
96 #define ARG_INFO_PARMS(args) TREE_PURPOSE(args)
97 #define ARG_INFO_TAGS(args) TREE_VALUE(args)
98 #define ARG_INFO_TYPES(args) TREE_CHAIN(args)
99 #define ARG_INFO_OTHERS(args) TREE_TYPE(args)
101 /* The file and line that the prototype came from if this is an
102 old-style definition; used for diagnostics in
103 store_parm_decls_oldstyle. */
105 static location_t current_function_prototype_locus;
107 /* The current statement tree. */
109 static GTY(()) struct stmt_tree_s c_stmt_tree;
111 /* State saving variables. */
115 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
116 included in this invocation. Note that the current translation
117 unit is not included in this list. */
119 static GTY(()) tree all_translation_units;
121 /* A list of decls to be made automatically visible in each file scope. */
122 static GTY(()) tree visible_builtins;
124 /* Set to 0 at beginning of a function definition, set to 1 if
125 a return statement that specifies a return value is seen. */
127 int current_function_returns_value;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a return statement with no argument is seen. */
132 int current_function_returns_null;
134 /* Set to 0 at beginning of a function definition, set to 1 if
135 a call to a noreturn function is seen. */
137 int current_function_returns_abnormally;
139 /* Set to nonzero by `grokdeclarator' for a function
140 whose return type is defaulted, if warnings for this are desired. */
142 static int warn_about_return_type;
144 /* Nonzero when starting a function declared `extern inline'. */
146 static int current_extern_inline;
148 /* True means global_bindings_p should return false even if the scope stack
149 says we are in file scope. */
150 bool c_override_global_bindings_to_false;
153 /* Each c_binding structure describes one binding of an identifier to
154 a decl. All the decls in a scope - irrespective of namespace - are
155 chained together by the ->prev field, which (as the name implies)
156 runs in reverse order. All the decls in a given namespace bound to
157 a given identifier are chained by the ->shadowed field, which runs
158 from inner to outer scopes. Finally, the ->contour field points
159 back to the relevant scope structure; this is mainly used to make
160 decls in the externals scope invisible (see below).
162 The ->decl field usually points to a DECL node, but there are two
163 exceptions. In the namespace of type tags, the bound entity is a
164 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
165 identifier is encountered, it is bound to error_mark_node to
166 suppress further errors about that identifier in the current
169 struct c_binding GTY((chain_next ("%h.prev")))
171 tree decl; /* the decl bound */
172 tree id; /* the identifier it's bound to */
173 struct c_binding *prev; /* the previous decl in this scope */
174 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
175 struct c_scope *contour; /* the scope in which this decl is bound */
178 #define I_SYMBOL_BINDING(node) \
179 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->symbol_binding)
180 #define I_SYMBOL_DECL(node) \
181 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
183 #define I_TAG_BINDING(node) \
184 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->tag_binding)
185 #define I_TAG_DECL(node) \
186 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
188 #define I_LABEL_BINDING(node) \
189 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->label_binding)
190 #define I_LABEL_DECL(node) \
191 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
193 /* Each C symbol points to three linked lists of c_binding structures.
194 These describe the values of the identifier in the three different
195 namespaces defined by the language. */
197 struct lang_identifier GTY(())
199 struct c_common_identifier common_id;
200 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
201 struct c_binding *tag_binding; /* struct/union/enum tags */
202 struct c_binding *label_binding; /* labels */
205 /* Validate c-lang.c's assumptions. */
206 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
207 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
209 /* The resulting tree type. */
212 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
213 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)")))
215 union tree_node GTY ((tag ("0"),
216 desc ("tree_node_structure (&%h)")))
218 struct lang_identifier GTY ((tag ("1"))) identifier;
221 /* Each c_scope structure describes the complete contents of one
222 scope. Four scopes are distinguished specially: the innermost or
223 current scope, the innermost function scope, the file scope (always
224 the second to outermost) and the outermost or external scope.
226 Most declarations are recorded in the current scope.
228 All normal label declarations are recorded in the innermost
229 function scope, as are bindings of undeclared identifiers to
230 error_mark_node. (GCC permits nested functions as an extension,
231 hence the 'innermost' qualifier.) Explicitly declared labels
232 (using the __label__ extension) appear in the current scope.
234 Being in the file scope (current_scope == file_scope) causes
235 special behavior in several places below. Also, under some
236 conditions the Objective-C front end records declarations in the
237 file scope even though that isn't the current scope.
239 All declarations with external linkage are recorded in the external
240 scope, even if they aren't visible there; this models the fact that
241 such declarations are visible to the entire program, and (with a
242 bit of cleverness, see pushdecl) allows diagnosis of some violations
243 of C99 6.2.2p7 and 6.2.7p2:
245 If, within the same translation unit, the same identifier appears
246 with both internal and external linkage, the behavior is
249 All declarations that refer to the same object or function shall
250 have compatible type; otherwise, the behavior is undefined.
252 Initially only the built-in declarations, which describe compiler
253 intrinsic functions plus a subset of the standard library, are in
256 The order of the blocks list matters, and it is frequently appended
257 to. To avoid having to walk all the way to the end of the list on
258 each insertion, or reverse the list later, we maintain a pointer to
259 the last list entry. (FIXME: It should be feasible to use a reversed
262 The bindings list is strictly in reverse order of declarations;
263 pop_scope relies on this. */
266 struct c_scope GTY((chain_next ("%h.outer")))
268 /* The scope containing this one. */
269 struct c_scope *outer;
271 /* The next outermost function scope. */
272 struct c_scope *outer_function;
274 /* All bindings in this scope. */
275 struct c_binding *bindings;
277 /* For each scope (except the global one), a chain of BLOCK nodes
278 for all the scopes that were entered and exited one level down. */
282 /* The depth of this scope. Used to keep the ->shadowed chain of
283 bindings sorted innermost to outermost. */
284 unsigned int depth : 28;
286 /* True if we are currently filling this scope with parameter
288 BOOL_BITFIELD parm_flag : 1;
290 /* True if we already complained about forward parameter decls
291 in this scope. This prevents double warnings on
292 foo (int a; int b; ...) */
293 BOOL_BITFIELD warned_forward_parm_decls : 1;
295 /* True if this is the outermost block scope of a function body.
296 This scope contains the parameters, the local variables declared
297 in the outermost block, and all the labels (except those in
298 nested functions, or declared at block scope with __label__). */
299 BOOL_BITFIELD function_body : 1;
301 /* True means make a BLOCK for this scope no matter what. */
302 BOOL_BITFIELD keep : 1;
305 /* The scope currently in effect. */
307 static GTY(()) struct c_scope *current_scope;
309 /* The innermost function scope. Ordinary (not explicitly declared)
310 labels, bindings to error_mark_node, and the lazily-created
311 bindings of __func__ and its friends get this scope. */
313 static GTY(()) struct c_scope *current_function_scope;
315 /* The C file scope. This is reset for each input translation unit. */
317 static GTY(()) struct c_scope *file_scope;
319 /* The outermost scope. This is used for all declarations with
320 external linkage, and only these, hence the name. */
322 static GTY(()) struct c_scope *external_scope;
324 /* A chain of c_scope structures awaiting reuse. */
326 static GTY((deletable)) struct c_scope *scope_freelist;
328 /* A chain of c_binding structures awaiting reuse. */
330 static GTY((deletable)) struct c_binding *binding_freelist;
332 /* Append VAR to LIST in scope SCOPE. */
333 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
334 struct c_scope *s_ = (scope); \
336 if (s_->list##_last) \
337 TREE_CHAIN (s_->list##_last) = d_; \
340 s_->list##_last = d_; \
343 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
344 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
345 struct c_scope *t_ = (tscope); \
346 struct c_scope *f_ = (fscope); \
348 TREE_CHAIN (t_->to##_last) = f_->from; \
351 t_->to##_last = f_->from##_last; \
354 /* True means unconditionally make a BLOCK for the next scope pushed. */
356 static bool keep_next_level_flag;
358 /* True means the next call to push_scope will be the outermost scope
359 of a function body, so do not push a new scope, merely cease
360 expecting parameter decls. */
362 static bool next_is_function_body;
364 /* Functions called automatically at the beginning and end of execution. */
366 tree static_ctors, static_dtors;
368 /* Forward declarations. */
369 static tree lookup_name_in_scope (tree, struct c_scope *);
370 static tree c_make_fname_decl (tree, int);
371 static tree grokdeclarator (tree, tree, enum decl_context, int, tree *);
372 static tree grokparms (tree, int);
373 static void layout_array_type (tree);
375 /* States indicating how grokdeclarator() should handle declspecs marked
376 with __attribute__((deprecated)). An object declared as
377 __attribute__((deprecated)) suppresses warnings of uses of other
380 enum deprecated_states {
385 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
388 c_print_identifier (FILE *file, tree node, int indent)
390 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
391 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
392 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
393 if (C_IS_RESERVED_WORD (node))
395 tree rid = ridpointers[C_RID_CODE (node)];
396 indent_to (file, indent + 4);
397 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
398 (void *) rid, IDENTIFIER_POINTER (rid));
402 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
403 which may be any of several kinds of DECL or TYPE or error_mark_node,
404 in the scope SCOPE. */
406 bind (tree name, tree decl, struct c_scope *scope)
408 struct c_binding *b, **here;
410 if (binding_freelist)
412 b = binding_freelist;
413 binding_freelist = b->prev;
416 b = ggc_alloc (sizeof (struct c_binding));
423 b->prev = scope->bindings;
429 switch (TREE_CODE (decl))
431 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
434 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
440 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
446 /* Locate the appropriate place in the chain of shadowed decls
447 to insert this binding. Normally, scope == current_scope and
448 this does nothing. */
449 while (*here && (*here)->contour->depth > scope->depth)
450 here = &(*here)->shadowed;
456 /* Clear the binding structure B, stick it on the binding_freelist,
457 and return the former value of b->prev. This is used by pop_scope
458 and get_parm_info to iterate destructively over all the bindings
459 from a given scope. */
460 static struct c_binding *
461 free_binding_and_advance (struct c_binding *b)
463 struct c_binding *prev = b->prev;
469 b->prev = binding_freelist;
470 binding_freelist = b;
476 /* Hook called at end of compilation to assume 1 elt
477 for a file-scope tentative array defn that wasn't complete before. */
480 c_finish_incomplete_decl (tree decl)
482 if (TREE_CODE (decl) == VAR_DECL)
484 tree type = TREE_TYPE (decl);
485 if (type != error_mark_node
486 && TREE_CODE (type) == ARRAY_TYPE
487 && ! DECL_EXTERNAL (decl)
488 && TYPE_DOMAIN (type) == 0)
490 warning ("%Jarray '%D' assumed to have one element", decl, decl);
492 complete_array_type (type, NULL_TREE, 1);
494 layout_decl (decl, 0);
499 /* The Objective-C front-end often needs to determine the current scope. */
502 get_current_scope (void)
504 return current_scope;
507 /* The following function is used only by Objective-C. It needs to live here
508 because it accesses the innards of c_scope. */
511 objc_mark_locals_volatile (void *enclosing_blk)
513 struct c_scope *scope;
516 for (scope = current_scope;
517 scope && scope != enclosing_blk;
518 scope = scope->outer)
520 for (b = scope->bindings; b; b = b->prev)
522 if (TREE_CODE (b->decl) == VAR_DECL
523 || TREE_CODE (b->decl) == PARM_DECL)
525 C_DECL_REGISTER (b->decl) = 0;
526 DECL_REGISTER (b->decl) = 0;
527 TREE_THIS_VOLATILE (b->decl) = 1;
531 /* Do not climb up past the current function. */
532 if (scope->function_body)
537 /* Nonzero if we are currently in file scope. */
540 global_bindings_p (void)
542 return current_scope == file_scope && !c_override_global_bindings_to_false;
546 keep_next_level (void)
548 keep_next_level_flag = true;
551 /* Identify this scope as currently being filled with parameters. */
554 declare_parm_level (void)
556 current_scope->parm_flag = true;
562 if (next_is_function_body)
564 /* This is the transition from the parameters to the top level
565 of the function body. These are the same scope
566 (C99 6.2.1p4,6) so we do not push another scope structure.
567 next_is_function_body is set only by store_parm_decls, which
568 in turn is called when and only when we are about to
569 encounter the opening curly brace for the function body.
571 The outermost block of a function always gets a BLOCK node,
572 because the debugging output routines expect that each
573 function has at least one BLOCK. */
574 current_scope->parm_flag = false;
575 current_scope->function_body = true;
576 current_scope->keep = true;
577 current_scope->outer_function = current_function_scope;
578 current_function_scope = current_scope;
580 keep_next_level_flag = false;
581 next_is_function_body = false;
585 struct c_scope *scope;
588 scope = scope_freelist;
589 scope_freelist = scope->outer;
592 scope = ggc_alloc_cleared (sizeof (struct c_scope));
594 scope->keep = keep_next_level_flag;
595 scope->outer = current_scope;
596 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
598 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
600 if (current_scope && scope->depth == 0)
603 sorry ("GCC supports only %u nested scopes\n", scope->depth);
606 current_scope = scope;
607 keep_next_level_flag = false;
611 /* Exit a scope. Restore the state of the identifier-decl mappings
612 that were in effect when this scope was entered. Return a BLOCK
613 node containing all the DECLs in this scope that are of interest
614 to debug info generation. */
619 struct c_scope *scope = current_scope;
620 tree block, context, p;
623 bool functionbody = scope->function_body;
624 bool keep = functionbody || scope->keep || scope->bindings;
626 /* If appropriate, create a BLOCK to record the decls for the life
631 block = make_node (BLOCK);
632 BLOCK_SUBBLOCKS (block) = scope->blocks;
633 TREE_USED (block) = 1;
635 /* In each subblock, record that this is its superior. */
636 for (p = scope->blocks; p; p = TREE_CHAIN (p))
637 BLOCK_SUPERCONTEXT (p) = block;
639 BLOCK_VARS (block) = 0;
642 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
643 scope must be set so that they point to the appropriate
644 construct, i.e. either to the current FUNCTION_DECL node, or
645 else to the BLOCK node we just constructed.
647 Note that for tagged types whose scope is just the formal
648 parameter list for some function type specification, we can't
649 properly set their TYPE_CONTEXTs here, because we don't have a
650 pointer to the appropriate FUNCTION_TYPE node readily available
651 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
652 type nodes get set in `grokdeclarator' as soon as we have created
653 the FUNCTION_TYPE node which will represent the "scope" for these
654 "parameter list local" tagged types. */
655 if (scope->function_body)
656 context = current_function_decl;
657 else if (scope == file_scope)
659 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
660 TREE_CHAIN (file_decl) = all_translation_units;
661 all_translation_units = file_decl;
667 /* Clear all bindings in this scope. */
668 for (b = scope->bindings; b; b = free_binding_and_advance (b))
671 switch (TREE_CODE (p))
674 /* Warnings for unused labels, errors for undefined labels. */
675 if (TREE_USED (p) && !DECL_INITIAL (p))
677 error ("%Jlabel `%D' used but not defined", p, p);
678 DECL_INITIAL (p) = error_mark_node;
680 else if (!TREE_USED (p) && warn_unused_label)
682 if (DECL_INITIAL (p))
683 warning ("%Jlabel `%D' defined but not used", p, p);
685 warning ("%Jlabel `%D' declared but not defined", p, p);
687 /* Labels go in BLOCK_VARS. */
688 TREE_CHAIN (p) = BLOCK_VARS (block);
689 BLOCK_VARS (block) = p;
691 #ifdef ENABLE_CHECKING
692 if (I_LABEL_BINDING (b->id) != b) abort ();
694 I_LABEL_BINDING (b->id) = b->shadowed;
700 TYPE_CONTEXT (p) = context;
702 /* Types may not have tag-names, in which case the type
703 appears in the bindings list with b->id NULL. */
706 #ifdef ENABLE_CHECKING
707 if (I_TAG_BINDING (b->id) != b) abort ();
709 I_TAG_BINDING (b->id) = b->shadowed;
714 /* Propagate TREE_ADDRESSABLE from nested functions to their
715 containing functions. */
716 if (! TREE_ASM_WRITTEN (p)
717 && DECL_INITIAL (p) != 0
718 && TREE_ADDRESSABLE (p)
719 && DECL_ABSTRACT_ORIGIN (p) != 0
720 && DECL_ABSTRACT_ORIGIN (p) != p)
721 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
725 /* Warnings for unused variables. Keep this in sync with
726 stmt.c:warn_about_unused_variables, which we cannot use
727 since it expects a different data structure. */
728 if (warn_unused_variable
730 && !DECL_IN_SYSTEM_HEADER (p)
732 && !DECL_ARTIFICIAL (p)
733 && (scope != file_scope
734 || (TREE_STATIC (p) && !TREE_PUBLIC (p)
735 && !TREE_THIS_VOLATILE (p)))
736 && scope != external_scope)
737 warning ("%Junused variable `%D'", p, p);
743 /* All of these go in BLOCK_VARS, but only if this is the
744 binding in the home scope. */
745 if (!C_DECL_IN_EXTERNAL_SCOPE (p) || scope == external_scope)
747 TREE_CHAIN (p) = BLOCK_VARS (block);
748 BLOCK_VARS (block) = p;
750 /* If this is the file scope, must set DECL_CONTEXT on these. */
751 if (!C_DECL_IN_EXTERNAL_SCOPE (p) && scope == file_scope)
752 DECL_CONTEXT (p) = context;
755 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
756 already been put there by store_parm_decls. Unused-
757 parameter warnings are handled by function.c.
758 error_mark_node obviously does not go in BLOCK_VARS and
759 does not get unused-variable warnings. */
762 /* It is possible for a decl not to have a name. We get
763 here with b->id NULL in this case. */
766 #ifdef ENABLE_CHECKING
767 if (I_SYMBOL_BINDING (b->id) != b) abort ();
769 I_SYMBOL_BINDING (b->id) = b->shadowed;
779 /* Dispose of the block that we just made inside some higher level. */
780 if ((scope->function_body || scope == file_scope) && context)
782 DECL_INITIAL (context) = block;
783 BLOCK_SUPERCONTEXT (block) = context;
785 else if (scope->outer)
788 SCOPE_LIST_APPEND (scope->outer, blocks, block);
789 /* If we did not make a block for the scope just exited, any
790 blocks made for inner scopes must be carried forward so they
791 will later become subblocks of something else. */
792 else if (scope->blocks)
793 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
796 /* Pop the current scope, and free the structure for reuse. */
797 current_scope = scope->outer;
798 if (scope->function_body)
799 current_function_scope = scope->outer_function;
801 memset (scope, 0, sizeof (struct c_scope));
802 scope->outer = scope_freelist;
803 scope_freelist = scope;
809 push_file_scope (void)
817 file_scope = current_scope;
819 start_fname_decls ();
821 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
822 bind (DECL_NAME (decl), decl, file_scope);
826 pop_file_scope (void)
828 /* In case there were missing closebraces, get us back to the global
830 while (current_scope != file_scope)
833 /* __FUNCTION__ is defined at file scope (""). This
834 call may not be necessary as my tests indicate it
835 still works without it. */
836 finish_fname_decls ();
838 /* Kludge: don't actually pop the file scope if generating a
839 precompiled header, so that macros and local symbols are still
840 visible to the PCH generator. */
844 /* And pop off the file scope. */
848 cpp_undef_all (parse_in);
851 /* Insert BLOCK at the end of the list of subblocks of the current
852 scope. This is used when a BIND_EXPR is expanded, to handle the
853 BLOCK node inside the BIND_EXPR. */
856 insert_block (tree block)
858 TREE_USED (block) = 1;
859 SCOPE_LIST_APPEND (current_scope, blocks, block);
862 /* Push a definition or a declaration of struct, union or enum tag "name".
863 "type" should be the type node.
864 We assume that the tag "name" is not already defined.
866 Note that the definition may really be just a forward reference.
867 In that case, the TYPE_SIZE will be zero. */
870 pushtag (tree name, tree type)
872 /* Record the identifier as the type's name if it has none. */
873 if (name && !TYPE_NAME (type))
874 TYPE_NAME (type) = name;
875 bind (name, type, current_scope);
877 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
878 tagged type we just added to the current scope. This fake
879 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
880 to output a representation of a tagged type, and it also gives
881 us a convenient place to record the "scope start" address for the
884 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
886 /* An approximation for now, so we can tell this is a function-scope tag.
887 This will be updated in pop_scope. */
888 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
891 /* Subroutine of compare_decls. Allow harmless mismatches in return
892 and argument types provided that the type modes match. This function
893 return a unified type given a suitable match, and 0 otherwise. */
896 match_builtin_function_types (tree newtype, tree oldtype)
898 tree newrettype, oldrettype;
899 tree newargs, oldargs;
900 tree trytype, tryargs;
902 /* Accept the return type of the new declaration if same modes. */
903 oldrettype = TREE_TYPE (oldtype);
904 newrettype = TREE_TYPE (newtype);
906 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
909 oldargs = TYPE_ARG_TYPES (oldtype);
910 newargs = TYPE_ARG_TYPES (newtype);
913 while (oldargs || newargs)
917 || ! TREE_VALUE (oldargs)
918 || ! TREE_VALUE (newargs)
919 || TYPE_MODE (TREE_VALUE (oldargs))
920 != TYPE_MODE (TREE_VALUE (newargs)))
923 oldargs = TREE_CHAIN (oldargs);
924 newargs = TREE_CHAIN (newargs);
927 trytype = build_function_type (newrettype, tryargs);
928 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
931 /* Subroutine of diagnose_mismatched_decls. Check for function type
932 mismatch involving an empty arglist vs a nonempty one and give clearer
935 diagnose_arglist_conflict (tree newdecl, tree olddecl,
936 tree newtype, tree oldtype)
940 if (TREE_CODE (olddecl) != FUNCTION_DECL
941 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
942 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
944 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
947 t = TYPE_ARG_TYPES (oldtype);
949 t = TYPE_ARG_TYPES (newtype);
950 for (; t; t = TREE_CHAIN (t))
952 tree type = TREE_VALUE (t);
954 if (TREE_CHAIN (t) == 0
955 && TYPE_MAIN_VARIANT (type) != void_type_node)
957 inform ("a parameter list with an ellipsis can't match "
958 "an empty parameter name list declaration");
962 if (c_type_promotes_to (type) != type)
964 inform ("an argument type that has a default promotion can't match "
965 "an empty parameter name list declaration");
971 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
972 old-style function definition, NEWDECL is a prototype declaration.
973 Diagnose inconsistencies in the argument list. Returns TRUE if
974 the prototype is compatible, FALSE if not. */
976 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
978 tree newargs, oldargs;
981 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
982 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
984 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
985 newargs = TYPE_ARG_TYPES (newtype);
990 tree oldargtype = TREE_VALUE (oldargs);
991 tree newargtype = TREE_VALUE (newargs);
993 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
996 /* Reaching the end of just one list means the two decls don't
997 agree on the number of arguments. */
998 if (END_OF_ARGLIST (oldargtype))
1000 error ("%Jprototype for '%D' declares more arguments "
1001 "than previous old-style definition", newdecl, newdecl);
1004 else if (END_OF_ARGLIST (newargtype))
1006 error ("%Jprototype for '%D' declares fewer arguments "
1007 "than previous old-style definition", newdecl, newdecl);
1011 /* Type for passing arg must be consistent with that declared
1013 else if (! comptypes (oldargtype, newargtype))
1015 error ("%Jprototype for '%D' declares arg %d with incompatible type",
1016 newdecl, newdecl, i);
1020 oldargs = TREE_CHAIN (oldargs);
1021 newargs = TREE_CHAIN (newargs);
1025 /* If we get here, no errors were found, but do issue a warning
1026 for this poor-style construct. */
1027 warning ("%Jprototype for '%D' follows non-prototype definition",
1030 #undef END_OF_ARGLIST
1033 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1034 first in a pair of mismatched declarations, using the diagnostic
1037 locate_old_decl (tree decl, void (*diag)(const char *, ...))
1039 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1041 else if (DECL_INITIAL (decl))
1042 diag (N_("%Jprevious definition of '%D' was here"), decl, decl);
1043 else if (C_DECL_IMPLICIT (decl))
1044 diag (N_("%Jprevious implicit declaration of '%D' was here"), decl, decl);
1046 diag (N_("%Jprevious declaration of '%D' was here"), decl, decl);
1049 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1050 Returns true if the caller should proceed to merge the two, false
1051 if OLDDECL should simply be discarded. As a side effect, issues
1052 all necessary diagnostics for invalid or poor-style combinations.
1053 If it returns true, writes the types of NEWDECL and OLDDECL to
1054 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1055 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1058 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1059 tree *newtypep, tree *oldtypep)
1061 tree newtype, oldtype;
1062 bool pedwarned = false;
1063 bool warned = false;
1065 /* If we have error_mark_node for either decl or type, just discard
1066 the previous decl - we're in an error cascade already. */
1067 if (olddecl == error_mark_node || newdecl == error_mark_node)
1069 *oldtypep = oldtype = TREE_TYPE (olddecl);
1070 *newtypep = newtype = TREE_TYPE (newdecl);
1071 if (oldtype == error_mark_node || newtype == error_mark_node)
1074 /* Two different categories of symbol altogether. This is an error
1075 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1076 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1078 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1079 && DECL_BUILT_IN (olddecl)
1080 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1082 error ("%J'%D' redeclared as different kind of symbol",
1084 locate_old_decl (olddecl, error);
1086 else if (TREE_PUBLIC (newdecl))
1087 warning ("%Jbuilt-in function '%D' declared as non-function",
1089 else if (warn_shadow)
1090 warning ("%Jdeclaration of '%D' shadows a built-in function",
1095 if (!comptypes (oldtype, newtype))
1097 if (TREE_CODE (olddecl) == FUNCTION_DECL
1098 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1100 /* Accept harmless mismatch in function types.
1101 This is for the ffs and fprintf builtins. */
1102 tree trytype = match_builtin_function_types (newtype, oldtype);
1104 if (trytype && comptypes (newtype, trytype))
1105 *oldtypep = oldtype = trytype;
1108 /* If types don't match for a built-in, throw away the
1109 built-in. No point in calling locate_old_decl here, it
1110 won't print anything. */
1111 warning ("%Jconflicting types for built-in function '%D'",
1116 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1117 && DECL_IS_BUILTIN (olddecl))
1119 /* A conflicting function declaration for a predeclared
1120 function that isn't actually built in. Objective C uses
1121 these. The new declaration silently overrides everything
1122 but the volatility (i.e. noreturn) indication. See also
1123 below. FIXME: Make Objective C use normal builtins. */
1124 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1127 /* Permit void foo (...) to match int foo (...) if the latter is
1128 the definition and implicit int was used. See
1129 c-torture/compile/920625-2.c. */
1130 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1131 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1132 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1133 && C_FUNCTION_IMPLICIT_INT (newdecl))
1135 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
1136 /* Make sure we keep void as the return type. */
1137 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1138 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1143 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1144 error ("%J conflicting type qualifiers for '%D'", newdecl, newdecl);
1146 error ("%Jconflicting types for '%D'", newdecl, newdecl);
1147 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1148 locate_old_decl (olddecl, error);
1153 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1154 but silently ignore the redeclaration if either is in a system
1155 header. (Conflicting redeclarations were handled above.) */
1156 if (TREE_CODE (newdecl) == TYPE_DECL)
1158 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1159 return true; /* Allow OLDDECL to continue in use. */
1161 error ("%Jredefinition of typedef '%D'", newdecl, newdecl);
1162 locate_old_decl (olddecl, error);
1166 /* Function declarations can either be 'static' or 'extern' (no
1167 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1168 can never conflict with each other on account of linkage (6.2.2p4).
1169 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1170 two definitions if one is 'extern inline' and one is not. The non-
1171 extern-inline definition supersedes the extern-inline definition. */
1172 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1174 /* If you declare a built-in function name as static, or
1175 define the built-in with an old-style definition (so we
1176 can't validate the argument list) the built-in definition is
1177 overridden, but optionally warn this was a bad choice of name. */
1178 if (DECL_BUILT_IN (olddecl)
1179 && !C_DECL_DECLARED_BUILTIN (olddecl)
1180 && (!TREE_PUBLIC (newdecl)
1181 || (DECL_INITIAL (newdecl)
1182 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1185 warning ("%Jdeclaration of '%D' shadows a built-in function",
1187 /* Discard the old built-in function. */
1191 if (DECL_INITIAL (newdecl))
1193 if (DECL_INITIAL (olddecl)
1194 && !(DECL_DECLARED_INLINE_P (olddecl)
1195 && DECL_EXTERNAL (olddecl)
1196 && !(DECL_DECLARED_INLINE_P (newdecl)
1197 && DECL_EXTERNAL (newdecl))))
1199 error ("%Jredefinition of '%D'", newdecl, newdecl);
1200 locate_old_decl (olddecl, error);
1204 /* If we have a prototype after an old-style function definition,
1205 the argument types must be checked specially. */
1206 else if (DECL_INITIAL (olddecl)
1207 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1208 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1209 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1211 locate_old_decl (olddecl, error);
1214 /* Mismatched non-static and static is considered poor style.
1215 We only diagnose static then non-static if -Wtraditional,
1216 because it is the most convenient way to get some effects
1217 (see e.g. what unwind-dw2-fde-glibc.c does to the definition
1218 of _Unwind_Find_FDE in unwind-dw2-fde.c). Revisit? */
1219 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1221 /* A static function declaration for a predeclared function
1222 that isn't actually built in, silently overrides the
1223 default. Objective C uses these. See also above.
1224 FIXME: Make Objective C use normal builtins. */
1225 if (TREE_CODE (olddecl) == FUNCTION_DECL
1226 && DECL_IS_BUILTIN (olddecl))
1230 warning ("%Jstatic declaration of '%D' follows "
1231 "non-static declaration", newdecl, newdecl);
1235 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl)
1236 && warn_traditional)
1238 warning ("%Jnon-static declaration of '%D' follows "
1239 "static declaration", newdecl, newdecl);
1243 else if (TREE_CODE (newdecl) == VAR_DECL)
1245 /* Only variables can be thread-local, and all declarations must
1246 agree on this property. */
1247 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1249 if (DECL_THREAD_LOCAL (newdecl))
1250 error ("%Jthread-local declaration of '%D' follows "
1251 "non-thread-local declaration", newdecl, newdecl);
1253 error ("%Jnon-thread-local declaration of '%D' follows "
1254 "thread-local declaration", newdecl, newdecl);
1256 locate_old_decl (olddecl, error);
1260 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1261 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1263 error ("%Jredefinition of '%D'", newdecl, newdecl);
1264 locate_old_decl (olddecl, error);
1268 /* Objects declared at file scope: if at least one is 'extern',
1269 it's fine (6.2.2p4); otherwise the linkage must agree (6.2.2p7). */
1270 if (DECL_FILE_SCOPE_P (newdecl))
1272 if (!DECL_EXTERNAL (newdecl)
1273 && !DECL_EXTERNAL (olddecl)
1274 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1276 if (TREE_PUBLIC (newdecl))
1277 error ("%Jnon-static declaration of '%D' follows "
1278 "static declaration", newdecl, newdecl);
1280 error ("%Jstatic declaration of '%D' follows "
1281 "non-static declaration", newdecl, newdecl);
1283 locate_old_decl (olddecl, error);
1287 /* Two objects with the same name declared at the same block
1288 scope must both be external references (6.7p3). */
1289 else if (DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl)
1290 && (!DECL_EXTERNAL (newdecl) || !DECL_EXTERNAL (olddecl)))
1292 if (DECL_EXTERNAL (newdecl))
1293 error ("%Jextern declaration of '%D' follows "
1294 "declaration with no linkage", newdecl, newdecl);
1295 else if (DECL_EXTERNAL (olddecl))
1296 error ("%Jdeclaration of '%D' with no linkage follows "
1297 "extern declaration", newdecl, newdecl);
1299 error ("%Jredeclaration of '%D' with no linkage",
1302 locate_old_decl (olddecl, error);
1308 /* All decls must agree on a non-default visibility. */
1309 if (DECL_VISIBILITY (newdecl) != VISIBILITY_DEFAULT
1310 && DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT
1311 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1313 warning ("%Jredeclaration of '%D' with different visibility "
1314 "(old visibility preserved)", newdecl, newdecl);
1318 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1320 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1321 if (DECL_DECLARED_INLINE_P (newdecl)
1322 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1324 warning ("%Jinline declaration of '%D' follows "
1325 "declaration with attribute noinline", newdecl, newdecl);
1328 else if (DECL_DECLARED_INLINE_P (olddecl)
1329 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1331 warning ("%Jdeclaration of '%D' with attribute noinline follows "
1332 "inline declaration ", newdecl, newdecl);
1336 /* Inline declaration after use or definition.
1337 ??? Should we still warn about this now we have unit-at-a-time
1338 mode and can get it right? */
1339 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl))
1341 if (TREE_USED (olddecl))
1343 warning ("%J'%D' declared inline after being called",
1347 else if (DECL_INITIAL (olddecl))
1349 warning ("%J'%D' declared inline after its definition",
1355 else /* PARM_DECL, VAR_DECL */
1357 /* Redeclaration of a parameter is a constraint violation (this is
1358 not explicitly stated, but follows from C99 6.7p3 [no more than
1359 one declaration of the same identifier with no linkage in the
1360 same scope, except type tags] and 6.2.2p6 [parameters have no
1361 linkage]). We must check for a forward parameter declaration,
1362 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1363 an extension, the mandatory diagnostic for which is handled by
1364 mark_forward_parm_decls. */
1366 if (TREE_CODE (newdecl) == PARM_DECL
1367 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1369 error ("%Jredefinition of parameter '%D'", newdecl, newdecl);
1370 locate_old_decl (olddecl, error);
1375 /* Optional warning for completely redundant decls. */
1376 if (!warned && !pedwarned
1377 && warn_redundant_decls
1378 /* Don't warn about a function declaration followed by a
1380 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1381 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1382 /* Don't warn about an extern followed by a definition. */
1383 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1384 /* Don't warn about forward parameter decls. */
1385 && !(TREE_CODE (newdecl) == PARM_DECL
1386 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1388 warning ("%Jredundant redeclaration of '%D'", newdecl, newdecl);
1392 /* Report location of previous decl/defn in a consistent manner. */
1393 if (warned || pedwarned)
1394 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1399 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1400 consistent with OLDDECL, but carries new information. Merge the
1401 new information into OLDDECL. This function issues no
1405 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1407 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1408 && DECL_INITIAL (newdecl) != 0);
1410 /* For real parm decl following a forward decl, rechain the old decl
1411 in its new location and clear TREE_ASM_WRITTEN (it's not a
1412 forward decl anymore). */
1413 if (TREE_CODE (newdecl) == PARM_DECL
1414 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1416 struct c_binding *b, **here;
1418 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1419 if ((*here)->decl == olddecl)
1426 b->prev = current_scope->bindings;
1427 current_scope->bindings = b;
1429 TREE_ASM_WRITTEN (olddecl) = 0;
1432 DECL_ATTRIBUTES (newdecl)
1433 = targetm.merge_decl_attributes (olddecl, newdecl);
1435 /* Merge the data types specified in the two decls. */
1437 = TREE_TYPE (olddecl)
1438 = composite_type (newtype, oldtype);
1440 /* Lay the type out, unless already done. */
1441 if (oldtype != TREE_TYPE (newdecl))
1443 if (TREE_TYPE (newdecl) != error_mark_node)
1444 layout_type (TREE_TYPE (newdecl));
1445 if (TREE_CODE (newdecl) != FUNCTION_DECL
1446 && TREE_CODE (newdecl) != TYPE_DECL
1447 && TREE_CODE (newdecl) != CONST_DECL)
1448 layout_decl (newdecl, 0);
1452 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1453 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1454 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1455 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1456 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1457 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1459 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1460 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1464 /* Keep the old rtl since we can safely use it. */
1465 COPY_DECL_RTL (olddecl, newdecl);
1467 /* Merge the type qualifiers. */
1468 if (TREE_READONLY (newdecl))
1469 TREE_READONLY (olddecl) = 1;
1471 if (TREE_THIS_VOLATILE (newdecl))
1473 TREE_THIS_VOLATILE (olddecl) = 1;
1474 if (TREE_CODE (newdecl) == VAR_DECL)
1475 make_var_volatile (newdecl);
1478 /* Keep source location of definition rather than declaration. */
1479 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1480 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1482 /* Merge the unused-warning information. */
1483 if (DECL_IN_SYSTEM_HEADER (olddecl))
1484 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1485 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1486 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1488 /* Merge the initialization information. */
1489 if (DECL_INITIAL (newdecl) == 0)
1490 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1492 /* Merge the section attribute.
1493 We want to issue an error if the sections conflict but that must be
1494 done later in decl_attributes since we are called before attributes
1496 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1497 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1499 /* Copy the assembler name.
1500 Currently, it can only be defined in the prototype. */
1501 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1503 /* If either declaration has a nondefault visibility, use it. */
1504 if (DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT)
1505 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1507 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1509 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1510 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1511 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1512 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1513 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1514 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1515 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1516 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1517 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1520 /* Merge the storage class information. */
1521 merge_weak (newdecl, olddecl);
1523 /* For functions, static overrides non-static. */
1524 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1526 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1527 /* This is since we don't automatically
1528 copy the attributes of NEWDECL into OLDDECL. */
1529 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1530 /* If this clears `static', clear it in the identifier too. */
1531 if (! TREE_PUBLIC (olddecl))
1532 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1534 if (DECL_EXTERNAL (newdecl))
1536 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1537 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1539 /* An extern decl does not override previous storage class. */
1540 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1541 if (! DECL_EXTERNAL (newdecl))
1543 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1544 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1549 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1550 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1553 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1555 /* If we're redefining a function previously defined as extern
1556 inline, make sure we emit debug info for the inline before we
1557 throw it away, in case it was inlined into a function that hasn't
1558 been written out yet. */
1559 if (new_is_definition && DECL_INITIAL (olddecl))
1561 if (TREE_USED (olddecl)
1562 /* In unit-at-a-time mode we never inline re-defined extern
1563 inline functions. */
1564 && !flag_unit_at_a_time
1565 && cgraph_function_possibly_inlined_p (olddecl))
1566 (*debug_hooks->outlining_inline_function) (olddecl);
1568 /* The new defn must not be inline. */
1569 DECL_INLINE (newdecl) = 0;
1570 DECL_UNINLINABLE (newdecl) = 1;
1574 /* If either decl says `inline', this fn is inline,
1575 unless its definition was passed already. */
1576 if (DECL_DECLARED_INLINE_P (newdecl)
1577 || DECL_DECLARED_INLINE_P (olddecl))
1578 DECL_DECLARED_INLINE_P (newdecl) = 1;
1580 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1581 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1584 if (DECL_BUILT_IN (olddecl))
1586 /* If redeclaring a builtin function, it stays built in.
1587 But it gets tagged as having been declared. */
1588 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1589 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1590 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1593 /* Also preserve various other info from the definition. */
1594 if (! new_is_definition)
1596 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1597 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1598 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1599 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1600 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1602 /* Set DECL_INLINE on the declaration if we've got a body
1603 from which to instantiate. */
1604 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1606 DECL_INLINE (newdecl) = 1;
1607 DECL_ABSTRACT_ORIGIN (newdecl)
1608 = DECL_ABSTRACT_ORIGIN (olddecl);
1613 /* If a previous declaration said inline, mark the
1614 definition as inlinable. */
1615 if (DECL_DECLARED_INLINE_P (newdecl)
1616 && ! DECL_UNINLINABLE (newdecl))
1617 DECL_INLINE (newdecl) = 1;
1621 /* This bit must not get wiped out. */
1622 C_DECL_IN_EXTERNAL_SCOPE (newdecl) |= C_DECL_IN_EXTERNAL_SCOPE (olddecl);
1624 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1625 But preserve OLDDECL's DECL_UID. */
1627 unsigned olddecl_uid = DECL_UID (olddecl);
1629 memcpy ((char *) olddecl + sizeof (struct tree_common),
1630 (char *) newdecl + sizeof (struct tree_common),
1631 sizeof (struct tree_decl) - sizeof (struct tree_common));
1632 DECL_UID (olddecl) = olddecl_uid;
1635 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1636 so that encode_section_info has a chance to look at the new decl
1637 flags and attributes. */
1638 if (DECL_RTL_SET_P (olddecl)
1639 && (TREE_CODE (olddecl) == FUNCTION_DECL
1640 || (TREE_CODE (olddecl) == VAR_DECL
1641 && TREE_STATIC (olddecl))))
1642 make_decl_rtl (olddecl, NULL);
1645 /* Handle when a new declaration NEWDECL has the same name as an old
1646 one OLDDECL in the same binding contour. Prints an error message
1649 If safely possible, alter OLDDECL to look like NEWDECL, and return
1650 true. Otherwise, return false. */
1653 duplicate_decls (tree newdecl, tree olddecl)
1655 tree newtype = NULL, oldtype = NULL;
1657 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1660 merge_decls (newdecl, olddecl, newtype, oldtype);
1665 /* Check whether decl-node NEW shadows an existing declaration. */
1667 warn_if_shadowing (tree new)
1669 struct c_binding *b;
1671 /* Shadow warnings wanted? */
1673 /* No shadow warnings for internally generated vars. */
1674 || DECL_IS_BUILTIN (new)
1675 /* No shadow warnings for vars made for inlining. */
1676 || DECL_FROM_INLINE (new)
1677 /* Don't warn about the parm names in function declarator
1678 within a function declarator. It would be nice to avoid
1679 warning in any function declarator in a declaration, as
1680 opposed to a definition, but there is no way to tell
1681 it's not a definition at this point. */
1682 || (TREE_CODE (new) == PARM_DECL && current_scope->outer->parm_flag))
1685 /* Is anything being shadowed? Do not be confused by a second binding
1686 to the same decl in the externals scope. */
1687 for (b = I_SYMBOL_BINDING (DECL_NAME (new)); b; b = b->shadowed)
1688 if (b->decl && b->decl != new && b->contour != external_scope)
1692 if (TREE_CODE (old) == PARM_DECL)
1693 warning ("%Jdeclaration of '%D' shadows a parameter", new, new);
1694 else if (DECL_FILE_SCOPE_P (old))
1695 warning ("%Jdeclaration of '%D' shadows a global declaration",
1697 else if (TREE_CODE (old) == FUNCTION_DECL && DECL_BUILT_IN (old))
1698 warning ("%Jdeclaration of '%D' shadows a built-in function",
1701 warning ("%Jdeclaration of '%D' shadows a previous local", new, new);
1703 if (TREE_CODE (old) != FUNCTION_DECL || !DECL_BUILT_IN (old))
1704 warning ("%Jshadowed declaration is here", old);
1711 /* Subroutine of pushdecl.
1713 X is a TYPE_DECL for a typedef statement. Create a brand new
1714 ..._TYPE node (which will be just a variant of the existing
1715 ..._TYPE node with identical properties) and then install X
1716 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1718 The whole point here is to end up with a situation where each
1719 and every ..._TYPE node the compiler creates will be uniquely
1720 associated with AT MOST one node representing a typedef name.
1721 This way, even though the compiler substitutes corresponding
1722 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1723 early on, later parts of the compiler can always do the reverse
1724 translation and get back the corresponding typedef name. For
1727 typedef struct S MY_TYPE;
1730 Later parts of the compiler might only know that `object' was of
1731 type `struct S' if it were not for code just below. With this
1732 code however, later parts of the compiler see something like:
1734 struct S' == struct S
1735 typedef struct S' MY_TYPE;
1738 And they can then deduce (from the node for type struct S') that
1739 the original object declaration was:
1743 Being able to do this is important for proper support of protoize,
1744 and also for generating precise symbolic debugging information
1745 which takes full account of the programmer's (typedef) vocabulary.
1747 Obviously, we don't want to generate a duplicate ..._TYPE node if
1748 the TYPE_DECL node that we are now processing really represents a
1749 standard built-in type.
1751 Since all standard types are effectively declared at line zero
1752 in the source file, we can easily check to see if we are working
1753 on a standard type by checking the current value of lineno. */
1756 clone_underlying_type (tree x)
1758 if (DECL_IS_BUILTIN (x))
1760 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1761 TYPE_NAME (TREE_TYPE (x)) = x;
1763 else if (TREE_TYPE (x) != error_mark_node
1764 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1766 tree tt = TREE_TYPE (x);
1767 DECL_ORIGINAL_TYPE (x) = tt;
1768 tt = build_type_copy (tt);
1770 TREE_USED (tt) = TREE_USED (x);
1775 /* Record a decl-node X as belonging to the current lexical scope.
1776 Check for errors (such as an incompatible declaration for the same
1777 name already seen in the same scope).
1779 Returns either X or an old decl for the same name.
1780 If an old decl is returned, it may have been smashed
1781 to agree with what X says. */
1786 tree name = DECL_NAME (x);
1787 struct c_scope *scope = current_scope;
1788 struct c_binding *b;
1790 /* Functions need the lang_decl data. */
1791 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1792 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1794 /* Must set DECL_CONTEXT for everything not at file scope or
1795 DECL_FILE_SCOPE_P won't work. Local externs don't count
1796 unless they have initializers (which generate code). */
1797 if (current_function_decl
1798 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
1799 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
1800 DECL_CONTEXT (x) = current_function_decl;
1802 /* Anonymous decls are just inserted in the scope. */
1805 bind (name, x, scope);
1809 /* First, see if there is another declaration with the same name in
1810 the current scope. If there is, duplicate_decls may do all the
1811 work for us. If duplicate_decls returns false, that indicates
1812 two incompatible decls in the same scope; we are to silently
1813 replace the old one (duplicate_decls has issued all appropriate
1814 diagnostics). In particular, we should not consider possible
1815 duplicates in the external scope, or shadowing. */
1816 b = I_SYMBOL_BINDING (name);
1817 if (b && b->contour == scope)
1819 if (duplicate_decls (x, b->decl))
1822 goto skip_external_and_shadow_checks;
1825 /* All declarations with external linkage, and all external
1826 references, go in the external scope, no matter what scope is
1827 current. However, the binding in that scope is ignored for
1828 purposes of normal name lookup. A separate binding structure is
1829 created in the requested scope; this governs the normal
1830 visibility of the symbol.
1832 The binding in the externals scope is used exclusively for
1833 detecting duplicate declarations of the same object, no matter
1834 what scope they are in; this is what we do here. (C99 6.2.7p2:
1835 All declarations that refer to the same object or function shall
1836 have compatible type; otherwise, the behavior is undefined.) */
1837 if (DECL_EXTERNAL (x) || scope == file_scope)
1839 if (warn_nested_externs
1840 && scope != file_scope
1841 && !DECL_IN_SYSTEM_HEADER (x))
1842 warning ("nested extern declaration of `%s'",
1843 IDENTIFIER_POINTER (name));
1845 while (b && b->contour != external_scope)
1848 /* The point of the same_translation_unit_p check here is,
1849 we want to detect a duplicate decl for a construct like
1850 foo() { extern bar(); } ... static bar(); but not if
1851 they are in different translation units. In any case,
1852 the static does not go in the externals scope. */
1854 && (DECL_EXTERNAL (x) || TREE_PUBLIC (x)
1855 || same_translation_unit_p (x, b->decl))
1856 && duplicate_decls (x, b->decl))
1858 bind (name, b->decl, scope);
1861 else if (DECL_EXTERNAL (x) || TREE_PUBLIC (x))
1863 C_DECL_IN_EXTERNAL_SCOPE (x) = 1;
1864 bind (name, x, external_scope);
1868 warn_if_shadowing (x);
1870 skip_external_and_shadow_checks:
1871 if (TREE_CODE (x) == TYPE_DECL)
1872 clone_underlying_type (x);
1874 bind (name, x, scope);
1876 /* If x's type is incomplete because it's based on a
1877 structure or union which has not yet been fully declared,
1878 attach it to that structure or union type, so we can go
1879 back and complete the variable declaration later, if the
1880 structure or union gets fully declared.
1882 If the input is erroneous, we can have error_mark in the type
1883 slot (e.g. "f(void a, ...)") - that doesn't count as an
1885 if (TREE_TYPE (x) != error_mark_node
1886 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1888 tree element = TREE_TYPE (x);
1890 while (TREE_CODE (element) == ARRAY_TYPE)
1891 element = TREE_TYPE (element);
1892 element = TYPE_MAIN_VARIANT (element);
1894 if ((TREE_CODE (element) == RECORD_TYPE
1895 || TREE_CODE (element) == UNION_TYPE)
1896 && (TREE_CODE (x) != TYPE_DECL
1897 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
1898 && !COMPLETE_TYPE_P (element))
1899 C_TYPE_INCOMPLETE_VARS (element)
1900 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
1905 /* Record X as belonging to file scope.
1906 This is used only internally by the Objective-C front end,
1907 and is limited to its needs. duplicate_decls is not called;
1908 if there is any preexisting decl for this identifier, it is an ICE. */
1911 pushdecl_top_level (tree x)
1915 if (TREE_CODE (x) != VAR_DECL)
1918 name = DECL_NAME (x);
1920 if (I_SYMBOL_BINDING (name))
1923 if (DECL_EXTERNAL (x) || TREE_PUBLIC (x))
1925 C_DECL_IN_EXTERNAL_SCOPE (x) = 1;
1926 bind (name, x, external_scope);
1929 bind (name, x, file_scope);
1935 implicit_decl_warning (tree id, tree olddecl)
1937 void (*diag) (const char *, ...);
1938 switch (mesg_implicit_function_declaration)
1941 case 1: diag = warning; break;
1942 case 2: diag = error; break;
1946 diag (N_("implicit declaration of function '%E'"), id);
1948 locate_old_decl (olddecl, diag);
1951 /* Generate an implicit declaration for identifier FUNCTIONID as a
1952 function of type int (). */
1955 implicitly_declare (tree functionid)
1957 tree decl = lookup_name_in_scope (functionid, external_scope);
1961 /* FIXME: Objective-C has weird not-really-builtin functions
1962 which are supposed to be visible automatically. They wind up
1963 in the external scope because they're pushed before the file
1964 scope gets created. Catch this here and rebind them into the
1966 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
1968 bind (functionid, decl, file_scope);
1973 /* Implicit declaration of a function already declared
1974 (somehow) in a different scope, or as a built-in.
1975 If this is the first time this has happened, warn;
1976 then recycle the old declaration. */
1977 if (!C_DECL_IMPLICIT (decl))
1979 implicit_decl_warning (functionid, decl);
1980 C_DECL_IMPLICIT (decl) = 1;
1982 bind (functionid, decl, current_scope);
1987 /* Not seen before. */
1988 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1989 DECL_EXTERNAL (decl) = 1;
1990 TREE_PUBLIC (decl) = 1;
1991 C_DECL_IMPLICIT (decl) = 1;
1992 implicit_decl_warning (functionid, 0);
1994 /* C89 says implicit declarations are in the innermost block.
1995 So we record the decl in the standard fashion. */
1996 decl = pushdecl (decl);
1998 /* No need to call objc_check_decl here - it's a function type. */
1999 rest_of_decl_compilation (decl, NULL, 0, 0);
2001 /* Write a record describing this implicit function declaration
2002 to the prototypes file (if requested). */
2003 gen_aux_info_record (decl, 0, 1, 0);
2005 /* Possibly apply some default attributes to this implicit declaration. */
2006 decl_attributes (&decl, NULL_TREE, 0);
2011 /* Issue an error message for a reference to an undeclared variable
2012 ID, including a reference to a builtin outside of function-call
2013 context. Establish a binding of the identifier to error_mark_node
2014 in an appropriate scope, which will suppress further errors for the
2017 undeclared_variable (tree id)
2019 static bool already = false;
2020 struct c_scope *scope;
2022 if (current_function_decl == 0)
2024 error ("'%E' undeclared here (not in a function)", id);
2025 scope = current_scope;
2029 error ("'%E' undeclared (first use in this function)", id);
2033 error ("(Each undeclared identifier is reported only once");
2034 error ("for each function it appears in.)");
2038 /* If we are parsing old-style parameter decls, current_function_decl
2039 will be nonnull but current_function_scope will be null. */
2040 scope = current_function_scope ? current_function_scope : current_scope;
2042 bind (id, error_mark_node, scope);
2045 /* Subroutine of lookup_label, declare_label, define_label: construct a
2046 LABEL_DECL with all the proper frills. */
2049 make_label (tree name, location_t location)
2051 tree label = build_decl (LABEL_DECL, name, void_type_node);
2053 DECL_CONTEXT (label) = current_function_decl;
2054 DECL_MODE (label) = VOIDmode;
2055 DECL_SOURCE_LOCATION (label) = location;
2060 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2061 Create one if none exists so far for the current function.
2062 This is called when a label is used in a goto expression or
2063 has its address taken. */
2066 lookup_label (tree name)
2070 if (current_function_decl == 0)
2072 error ("label %s referenced outside of any function",
2073 IDENTIFIER_POINTER (name));
2077 /* Use a label already defined or ref'd with this name, but not if
2078 it is inherited from a containing function and wasn't declared
2080 label = I_LABEL_DECL (name);
2081 if (label && (DECL_CONTEXT (label) == current_function_decl
2082 || C_DECLARED_LABEL_FLAG (label)))
2084 /* If the label has only been declared, update its apparent
2085 location to point here, for better diagnostics if it
2086 turns out not to have been defined. */
2087 if (!TREE_USED (label))
2088 DECL_SOURCE_LOCATION (label) = input_location;
2092 /* No label binding for that identifier; make one. */
2093 label = make_label (name, input_location);
2095 /* Ordinary labels go in the current function scope. */
2096 bind (name, label, current_function_scope);
2100 /* Make a label named NAME in the current function, shadowing silently
2101 any that may be inherited from containing functions or containing
2102 scopes. This is called for __label__ declarations. */
2105 declare_label (tree name)
2107 struct c_binding *b = I_LABEL_BINDING (name);
2110 /* Check to make sure that the label hasn't already been declared
2112 if (b && b->contour == current_scope)
2114 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2115 locate_old_decl (b->decl, error);
2117 /* Just use the previous declaration. */
2121 label = make_label (name, input_location);
2122 C_DECLARED_LABEL_FLAG (label) = 1;
2124 /* Declared labels go in the current scope. */
2125 bind (name, label, current_scope);
2129 /* Define a label, specifying the location in the source file.
2130 Return the LABEL_DECL node for the label, if the definition is valid.
2131 Otherwise return 0. */
2134 define_label (location_t location, tree name)
2136 /* Find any preexisting label with this name. It is an error
2137 if that label has already been defined in this function, or
2138 if there is a containing function with a declared label with
2140 tree label = I_LABEL_DECL (name);
2143 && ((DECL_CONTEXT (label) == current_function_decl
2144 && DECL_INITIAL (label) != 0)
2145 || (DECL_CONTEXT (label) != current_function_decl
2146 && C_DECLARED_LABEL_FLAG (label))))
2148 error ("%Hduplicate label `%D'", &location, label);
2149 locate_old_decl (label, error);
2152 else if (label && DECL_CONTEXT (label) == current_function_decl)
2154 /* The label has been used or declared already in this function,
2155 but not defined. Update its location to point to this
2157 DECL_SOURCE_LOCATION (label) = location;
2161 /* No label binding for that identifier; make one. */
2162 label = make_label (name, location);
2164 /* Ordinary labels go in the current function scope. */
2165 bind (name, label, current_function_scope);
2168 if (warn_traditional && !in_system_header && lookup_name (name))
2169 warning ("%Htraditional C lacks a separate namespace for labels, "
2170 "identifier `%s' conflicts", &location,
2171 IDENTIFIER_POINTER (name));
2173 /* Mark label as having been defined. */
2174 DECL_INITIAL (label) = error_mark_node;
2178 /* Given NAME, an IDENTIFIER_NODE,
2179 return the structure (or union or enum) definition for that name.
2180 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2181 CODE says which kind of type the caller wants;
2182 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2183 If the wrong kind of type is found, an error is reported. */
2186 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2188 struct c_binding *b = I_TAG_BINDING (name);
2194 /* We only care about whether it's in this level if
2195 thislevel_only was set or it might be a type clash. */
2196 if (thislevel_only || TREE_CODE (b->decl) != code)
2198 /* For our purposes, a tag in the external scope is the same as
2199 a tag in the file scope. (Primarily relevant to Objective-C
2200 and its builtin structure tags, which get pushed before the
2201 file scope is created.) */
2202 if (b->contour == current_scope
2203 || (current_scope == file_scope && b->contour == external_scope))
2207 if (thislevel_only && !thislevel)
2210 if (TREE_CODE (b->decl) != code)
2212 /* Definition isn't the kind we were looking for. */
2213 pending_invalid_xref = name;
2214 pending_invalid_xref_location = input_location;
2216 /* If in the same binding level as a declaration as a tag
2217 of a different type, this must not be allowed to
2218 shadow that tag, so give the error immediately.
2219 (For example, "struct foo; union foo;" is invalid.) */
2221 pending_xref_error ();
2226 /* Print an error message now
2227 for a recent invalid struct, union or enum cross reference.
2228 We don't print them immediately because they are not invalid
2229 when used in the `struct foo;' construct for shadowing. */
2232 pending_xref_error (void)
2234 if (pending_invalid_xref != 0)
2235 error ("%H`%s' defined as wrong kind of tag",
2236 &pending_invalid_xref_location,
2237 IDENTIFIER_POINTER (pending_invalid_xref));
2238 pending_invalid_xref = 0;
2242 /* Look up NAME in the current scope and its superiors
2243 in the namespace of variables, functions and typedefs.
2244 Return a ..._DECL node of some kind representing its definition,
2245 or return 0 if it is undefined. */
2248 lookup_name (tree name)
2250 struct c_binding *b = I_SYMBOL_BINDING (name);
2251 if (b && (b->contour != external_scope || TREE_CODE (b->decl) == TYPE_DECL))
2256 /* Similar to `lookup_name' but look only at the indicated scope. */
2259 lookup_name_in_scope (tree name, struct c_scope *scope)
2261 struct c_binding *b;
2263 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2264 if (b->contour == scope)
2269 /* Create the predefined scalar types of C,
2270 and some nodes representing standard constants (0, 1, (void *) 0).
2271 Initialize the global scope.
2272 Make definitions for built-in primitive functions. */
2275 c_init_decl_processing (void)
2278 tree ptr_ftype_void, ptr_ftype_ptr;
2279 location_t save_loc = input_location;
2281 /* Adds some ggc roots, and reserved words for c-parse.in. */
2284 current_function_decl = 0;
2286 /* Make the externals scope. */
2288 external_scope = current_scope;
2290 /* Declarations from c_common_nodes_and_builtins must not be associated
2291 with this input file, lest we get differences between using and not
2292 using preprocessed headers. */
2293 #ifdef USE_MAPPED_LOCATION
2294 input_location = BUILTINS_LOCATION;
2296 input_location.file = "<built-in>";
2297 input_location.line = 0;
2300 build_common_tree_nodes (flag_signed_char);
2302 c_common_nodes_and_builtins ();
2304 /* In C, comparisons and TRUTH_* expressions have type int. */
2305 truthvalue_type_node = integer_type_node;
2306 truthvalue_true_node = integer_one_node;
2307 truthvalue_false_node = integer_zero_node;
2309 /* Even in C99, which has a real boolean type. */
2310 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2311 boolean_type_node));
2313 endlink = void_list_node;
2314 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2316 = build_function_type (ptr_type_node,
2317 tree_cons (NULL_TREE, ptr_type_node, endlink));
2319 input_location = save_loc;
2321 pedantic_lvalues = true;
2323 make_fname_decl = c_make_fname_decl;
2324 start_fname_decls ();
2327 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2328 decl, NAME is the initialization string and TYPE_DEP indicates whether
2329 NAME depended on the type of the function. As we don't yet implement
2330 delayed emission of static data, we mark the decl as emitted
2331 so it is not placed in the output. Anything using it must therefore pull
2332 out the STRING_CST initializer directly. FIXME. */
2335 c_make_fname_decl (tree id, int type_dep)
2337 const char *name = fname_as_string (type_dep);
2338 tree decl, type, init;
2339 size_t length = strlen (name);
2341 type = build_array_type
2342 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2343 build_index_type (size_int (length)));
2345 decl = build_decl (VAR_DECL, id, type);
2347 TREE_STATIC (decl) = 1;
2348 TREE_READONLY (decl) = 1;
2349 DECL_ARTIFICIAL (decl) = 1;
2351 init = build_string (length + 1, name);
2352 free ((char *) name);
2353 TREE_TYPE (init) = type;
2354 DECL_INITIAL (decl) = init;
2356 TREE_USED (decl) = 1;
2358 if (current_function_decl)
2360 DECL_CONTEXT (decl) = current_function_decl;
2361 bind (id, decl, current_function_scope);
2364 finish_decl (decl, init, NULL_TREE);
2369 /* Return a definition for a builtin function named NAME and whose data type
2370 is TYPE. TYPE should be a function type with argument types.
2371 FUNCTION_CODE tells later passes how to compile calls to this function.
2372 See tree.h for its possible values.
2374 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2375 the name to be called if we can't opencode the function. If
2376 ATTRS is nonzero, use that for the function's attribute list. */
2379 builtin_function (const char *name, tree type, int function_code,
2380 enum built_in_class class, const char *library_name,
2383 tree id = get_identifier (name);
2384 tree decl = build_decl (FUNCTION_DECL, id, type);
2385 TREE_PUBLIC (decl) = 1;
2386 DECL_EXTERNAL (decl) = 1;
2387 DECL_LANG_SPECIFIC (decl) = ggc_alloc_cleared (sizeof (struct lang_decl));
2388 DECL_BUILT_IN_CLASS (decl) = class;
2389 DECL_FUNCTION_CODE (decl) = function_code;
2391 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2393 /* Should never be called on a symbol with a preexisting meaning. */
2394 if (I_SYMBOL_BINDING (id))
2397 C_DECL_IN_EXTERNAL_SCOPE (decl) = 1;
2398 bind (id, decl, external_scope);
2400 /* Builtins in the implementation namespace are made visible without
2401 needing to be explicitly declared. See push_file_scope. */
2402 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2404 TREE_CHAIN (decl) = visible_builtins;
2405 visible_builtins = decl;
2408 /* Possibly apply some default attributes to this built-in function. */
2410 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2412 decl_attributes (&decl, NULL_TREE, 0);
2417 /* Called when a declaration is seen that contains no names to declare.
2418 If its type is a reference to a structure, union or enum inherited
2419 from a containing scope, shadow that tag name for the current scope
2420 with a forward reference.
2421 If its type defines a new named structure or union
2422 or defines an enum, it is valid but we need not do anything here.
2423 Otherwise, it is an error. */
2426 shadow_tag (tree declspecs)
2428 shadow_tag_warned (declspecs, 0);
2432 shadow_tag_warned (tree declspecs, int warned)
2435 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2442 pending_invalid_xref = 0;
2444 /* Remove the attributes from declspecs, since they will confuse the
2446 split_specs_attrs (declspecs, &specs, &attrs);
2448 for (link = specs; link; link = TREE_CHAIN (link))
2450 tree value = TREE_VALUE (link);
2451 enum tree_code code = TREE_CODE (value);
2453 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2454 /* Used to test also that TYPE_SIZE (value) != 0.
2455 That caused warning for `struct foo;' at top level in the file. */
2457 tree name = TYPE_NAME (value);
2464 if (warned != 1 && code != ENUMERAL_TYPE)
2465 /* Empty unnamed enum OK */
2467 pedwarn ("unnamed struct/union that defines no instances");
2473 t = lookup_tag (code, name, 1);
2477 t = make_node (code);
2484 if (!warned && ! in_system_header)
2486 warning ("useless keyword or type name in empty declaration");
2493 error ("two types specified in one empty declaration");
2498 pedwarn ("empty declaration");
2502 /* Construct an array declarator. EXPR is the expression inside [], or
2503 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2504 to the pointer to which a parameter array is converted). STATIC_P is
2505 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2506 is nonzero is the array is [*], a VLA of unspecified length which is
2507 nevertheless a complete type (not currently implemented by GCC),
2508 zero otherwise. The declarator is constructed as an ARRAY_REF
2509 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2510 left of the [] (filled by in set_array_declarator_type) and operand 1
2511 is the expression inside; whose TREE_TYPE is the type qualifiers and
2512 which has TREE_STATIC set if "static" is used. */
2515 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2518 decl = build_nt (ARRAY_REF, NULL_TREE, expr, NULL_TREE, NULL_TREE);
2519 TREE_TYPE (decl) = quals;
2520 TREE_STATIC (decl) = (static_p ? 1 : 0);
2521 if (pedantic && !flag_isoc99)
2523 if (static_p || quals != NULL_TREE)
2524 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2526 pedwarn ("ISO C90 does not support `[*]' array declarators");
2529 warning ("GCC does not yet properly implement `[*]' array declarators");
2533 /* Set the type of an array declarator. DECL is the declarator, as
2534 constructed by build_array_declarator; TYPE is what appears on the left
2535 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2536 abstract declarator, zero otherwise; this is used to reject static and
2537 type qualifiers in abstract declarators, where they are not in the
2541 set_array_declarator_type (tree decl, tree type, int abstract_p)
2543 TREE_OPERAND (decl, 0) = type;
2544 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2545 error ("static or type qualifiers in abstract declarator");
2549 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2552 groktypename (tree typename)
2556 if (TREE_CODE (typename) != TREE_LIST)
2559 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2561 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0,
2564 /* Apply attributes. */
2565 decl_attributes (&typename, attrs, 0);
2570 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2573 groktypename_in_parm_context (tree typename)
2575 if (TREE_CODE (typename) != TREE_LIST)
2577 return grokdeclarator (TREE_VALUE (typename),
2578 TREE_PURPOSE (typename),
2582 /* Decode a declarator in an ordinary declaration or data definition.
2583 This is called as soon as the type information and variable name
2584 have been parsed, before parsing the initializer if any.
2585 Here we create the ..._DECL node, fill in its type,
2586 and put it on the list of decls for the current context.
2587 The ..._DECL node is returned as the value.
2589 Exception: for arrays where the length is not specified,
2590 the type is left null, to be filled in by `finish_decl'.
2592 Function definitions do not come here; they go to start_function
2593 instead. However, external and forward declarations of functions
2594 do go through here. Structure field declarations are done by
2595 grokfield and not through here. */
2598 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2603 /* An object declared as __attribute__((deprecated)) suppresses
2604 warnings of uses of other deprecated items. */
2605 if (lookup_attribute ("deprecated", attributes))
2606 deprecated_state = DEPRECATED_SUPPRESS;
2608 decl = grokdeclarator (declarator, declspecs,
2609 NORMAL, initialized, NULL);
2611 deprecated_state = DEPRECATED_NORMAL;
2613 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2614 && MAIN_NAME_P (DECL_NAME (decl)))
2615 warning ("%J'%D' is usually a function", decl, decl);
2618 /* Is it valid for this decl to have an initializer at all?
2619 If not, set INITIALIZED to zero, which will indirectly
2620 tell 'finish_decl' to ignore the initializer once it is parsed. */
2621 switch (TREE_CODE (decl))
2624 error ("typedef '%D' is initialized (use __typeof__ instead)", decl);
2629 error ("function '%D' is initialized like a variable", decl);
2634 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2635 error ("parameter '%D' is initialized", decl);
2640 /* Don't allow initializations for incomplete types except for
2641 arrays which might be completed by the initialization. */
2643 /* This can happen if the array size is an undefined macro.
2644 We already gave a warning, so we don't need another one. */
2645 if (TREE_TYPE (decl) == error_mark_node)
2647 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2649 /* A complete type is ok if size is fixed. */
2651 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2652 || C_DECL_VARIABLE_SIZE (decl))
2654 error ("variable-sized object may not be initialized");
2658 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2660 error ("variable '%D' has initializer but incomplete type", decl);
2663 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2665 error ("elements of array '%D' have incomplete type", decl);
2672 DECL_EXTERNAL (decl) = 0;
2673 if (current_scope == file_scope)
2674 TREE_STATIC (decl) = 1;
2676 /* Tell 'pushdecl' this is an initialized decl
2677 even though we don't yet have the initializer expression.
2678 Also tell 'finish_decl' it may store the real initializer. */
2679 DECL_INITIAL (decl) = error_mark_node;
2682 /* If this is a function declaration, write a record describing it to the
2683 prototypes file (if requested). */
2685 if (TREE_CODE (decl) == FUNCTION_DECL)
2686 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2688 /* ANSI specifies that a tentative definition which is not merged with
2689 a non-tentative definition behaves exactly like a definition with an
2690 initializer equal to zero. (Section 3.7.2)
2692 -fno-common gives strict ANSI behavior, though this tends to break
2693 a large body of code that grew up without this rule.
2695 Thread-local variables are never common, since there's no entrenched
2696 body of code to break, and it allows more efficient variable references
2697 in the presence of dynamic linking. */
2699 if (TREE_CODE (decl) == VAR_DECL
2701 && TREE_PUBLIC (decl)
2702 && !DECL_THREAD_LOCAL (decl)
2704 DECL_COMMON (decl) = 1;
2706 /* Set attributes here so if duplicate decl, will have proper attributes. */
2707 decl_attributes (&decl, attributes, 0);
2709 if (TREE_CODE (decl) == FUNCTION_DECL
2710 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2712 tree ce = declarator;
2714 if (TREE_CODE (ce) == INDIRECT_REF)
2715 ce = TREE_OPERAND (declarator, 0);
2716 if (TREE_CODE (ce) == CALL_EXPR)
2718 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2719 for (; args; args = TREE_CHAIN (args))
2721 tree type = TREE_TYPE (args);
2722 if (type && INTEGRAL_TYPE_P (type)
2723 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2724 DECL_ARG_TYPE (args) = integer_type_node;
2729 if (TREE_CODE (decl) == FUNCTION_DECL
2730 && DECL_DECLARED_INLINE_P (decl)
2731 && DECL_UNINLINABLE (decl)
2732 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2733 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2735 /* Add this decl to the current scope.
2736 TEM may equal DECL or it may be a previous decl of the same name. */
2737 tem = pushdecl (decl);
2742 /* Finish processing of a declaration;
2743 install its initial value.
2744 If the length of an array type is not known before,
2745 it must be determined now, from the initial value, or it is an error. */
2748 finish_decl (tree decl, tree init, tree asmspec_tree)
2750 tree type = TREE_TYPE (decl);
2751 int was_incomplete = (DECL_SIZE (decl) == 0);
2752 const char *asmspec = 0;
2754 /* If a name was specified, get the string. */
2755 if (current_scope == file_scope)
2756 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2758 asmspec = TREE_STRING_POINTER (asmspec_tree);
2760 /* If `start_decl' didn't like having an initialization, ignore it now. */
2761 if (init != 0 && DECL_INITIAL (decl) == 0)
2764 /* Don't crash if parm is initialized. */
2765 if (TREE_CODE (decl) == PARM_DECL)
2769 store_init_value (decl, init);
2771 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
2772 || TREE_CODE (decl) == FUNCTION_DECL
2773 || TREE_CODE (decl) == FIELD_DECL))
2774 objc_check_decl (decl);
2776 /* Deduce size of array from initialization, if not already known. */
2777 if (TREE_CODE (type) == ARRAY_TYPE
2778 && TYPE_DOMAIN (type) == 0
2779 && TREE_CODE (decl) != TYPE_DECL)
2782 = (TREE_STATIC (decl)
2783 /* Even if pedantic, an external linkage array
2784 may have incomplete type at first. */
2785 ? pedantic && !TREE_PUBLIC (decl)
2786 : !DECL_EXTERNAL (decl));
2788 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2790 /* Get the completed type made by complete_array_type. */
2791 type = TREE_TYPE (decl);
2794 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2796 else if (failure == 2)
2799 error ("%Jarray size missing in '%D'", decl, decl);
2800 /* If a `static' var's size isn't known,
2801 make it extern as well as static, so it does not get
2803 If it is not `static', then do not mark extern;
2804 finish_incomplete_decl will give it a default size
2805 and it will get allocated. */
2806 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2807 DECL_EXTERNAL (decl) = 1;
2810 /* TYPE_MAX_VALUE is always one less than the number of elements
2811 in the array, because we start counting at zero. Therefore,
2812 warn only if the value is less than zero. */
2813 else if (pedantic && TYPE_DOMAIN (type) != 0
2814 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2815 error ("%Jzero or negative size array '%D'", decl, decl);
2817 layout_decl (decl, 0);
2820 if (TREE_CODE (decl) == VAR_DECL)
2822 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2823 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2824 layout_decl (decl, 0);
2826 if (DECL_SIZE (decl) == 0
2827 /* Don't give an error if we already gave one earlier. */
2828 && TREE_TYPE (decl) != error_mark_node
2829 && (TREE_STATIC (decl)
2831 /* A static variable with an incomplete type
2832 is an error if it is initialized.
2833 Also if it is not file scope.
2834 Otherwise, let it through, but if it is not `extern'
2835 then it may cause an error message later. */
2836 (DECL_INITIAL (decl) != 0
2837 || !DECL_FILE_SCOPE_P (decl))
2839 /* An automatic variable with an incomplete type
2841 !DECL_EXTERNAL (decl)))
2843 error ("%Jstorage size of '%D' isn't known", decl, decl);
2844 TREE_TYPE (decl) = error_mark_node;
2847 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2848 && DECL_SIZE (decl) != 0)
2850 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2851 constant_expression_warning (DECL_SIZE (decl));
2853 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2856 if (TREE_USED (type))
2857 TREE_USED (decl) = 1;
2860 /* If this is a function and an assembler name is specified, reset DECL_RTL
2861 so we can give it its new name. Also, update built_in_decls if it
2862 was a normal built-in. */
2863 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2865 /* ASMSPEC is given, and not the name of a register. Mark the
2866 name with a star so assemble_name won't munge it. */
2867 char *starred = alloca (strlen (asmspec) + 2);
2869 strcpy (starred + 1, asmspec);
2871 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2873 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2874 SET_DECL_RTL (builtin, NULL_RTX);
2875 change_decl_assembler_name (builtin, get_identifier (starred));
2876 #ifdef TARGET_MEM_FUNCTIONS
2877 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2878 init_block_move_fn (starred);
2879 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2880 init_block_clear_fn (starred);
2882 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2883 init_block_move_fn (starred);
2884 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2885 init_block_clear_fn (starred);
2888 SET_DECL_RTL (decl, NULL_RTX);
2889 change_decl_assembler_name (decl, get_identifier (starred));
2892 /* If #pragma weak was used, mark the decl weak now. */
2893 if (current_scope == file_scope)
2894 maybe_apply_pragma_weak (decl);
2896 /* Output the assembler code and/or RTL code for variables and functions,
2897 unless the type is an undefined structure or union.
2898 If not, it will get done when the type is completed. */
2900 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2902 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2903 if (c_dialect_objc ())
2904 objc_check_decl (decl);
2906 if (DECL_FILE_SCOPE_P (decl))
2908 if (DECL_INITIAL (decl) == NULL_TREE
2909 || DECL_INITIAL (decl) == error_mark_node)
2910 /* Don't output anything
2911 when a tentative file-scope definition is seen.
2912 But at end of compilation, do output code for them. */
2913 DECL_DEFER_OUTPUT (decl) = 1;
2914 rest_of_decl_compilation (decl, asmspec, true, 0);
2918 /* This is a local variable. If there is an ASMSPEC, the
2919 user has requested that we handle it specially. */
2922 /* In conjunction with an ASMSPEC, the `register'
2923 keyword indicates that we should place the variable
2924 in a particular register. */
2925 if (C_DECL_REGISTER (decl))
2927 DECL_HARD_REGISTER (decl) = 1;
2928 /* This cannot be done for a structure with volatile
2929 fields, on which DECL_REGISTER will have been
2931 if (!DECL_REGISTER (decl))
2932 error ("cannot put object with volatile field into register");
2935 /* If this is not a static variable, issue a warning.
2936 It doesn't make any sense to give an ASMSPEC for an
2937 ordinary, non-register local variable. Historically,
2938 GCC has accepted -- but ignored -- the ASMSPEC in
2940 if (TREE_CODE (decl) == VAR_DECL
2941 && !C_DECL_REGISTER (decl)
2942 && !TREE_STATIC (decl))
2943 warning ("%Jignoring asm-specifier for non-static local "
2944 "variable '%D'", decl, decl);
2946 change_decl_assembler_name (decl, get_identifier (asmspec));
2949 if (TREE_CODE (decl) != FUNCTION_DECL)
2950 add_stmt (build_stmt (DECL_EXPR, decl));
2953 if (!DECL_FILE_SCOPE_P (decl))
2955 /* Recompute the RTL of a local array now
2956 if it used to be an incomplete type. */
2958 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2960 /* If we used it already as memory, it must stay in memory. */
2961 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2962 /* If it's still incomplete now, no init will save it. */
2963 if (DECL_SIZE (decl) == 0)
2964 DECL_INITIAL (decl) = 0;
2969 /* If this was marked 'used', be sure it will be output. */
2970 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2971 mark_decl_referenced (decl);
2973 if (TREE_CODE (decl) == TYPE_DECL)
2975 if (!DECL_FILE_SCOPE_P (decl)
2976 && variably_modified_type_p (TREE_TYPE (decl)))
2977 add_stmt (build_stmt (DECL_EXPR, decl));
2979 rest_of_decl_compilation (decl, NULL, DECL_FILE_SCOPE_P (decl), 0);
2982 /* At the end of a declaration, throw away any variable type sizes
2983 of types defined inside that declaration. There is no use
2984 computing them in the following function definition. */
2985 if (current_scope == file_scope)
2986 get_pending_sizes ();
2988 /* Install a cleanup (aka destructor) if one was given. */
2989 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2991 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2994 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2995 tree cleanup_decl = lookup_name (cleanup_id);
2998 /* Build "cleanup(&decl)" for the destructor. */
2999 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3000 cleanup = build_tree_list (NULL_TREE, cleanup);
3001 cleanup = build_function_call (cleanup_decl, cleanup);
3003 /* Don't warn about decl unused; the cleanup uses it. */
3004 TREE_USED (decl) = 1;
3005 TREE_USED (cleanup_decl) = 1;
3007 /* Initialize EH, if we've been told to do so. */
3008 if (flag_exceptions && !c_eh_initialized_p)
3010 c_eh_initialized_p = true;
3011 eh_personality_libfunc
3012 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3013 ? "__gcc_personality_sj0"
3014 : "__gcc_personality_v0");
3015 using_eh_for_cleanups ();
3018 push_cleanup (decl, cleanup, false);
3023 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3024 and push that on the current scope. */
3027 push_parm_decl (tree parm)
3031 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3032 TREE_PURPOSE (TREE_PURPOSE (parm)),
3034 decl_attributes (&decl, TREE_VALUE (parm), 0);
3036 decl = pushdecl (decl);
3038 finish_decl (decl, NULL_TREE, NULL_TREE);
3041 /* Mark all the parameter declarations to date as forward decls.
3042 Also diagnose use of this extension. */
3045 mark_forward_parm_decls (void)
3047 struct c_binding *b;
3049 if (pedantic && !current_scope->warned_forward_parm_decls)
3051 pedwarn ("ISO C forbids forward parameter declarations");
3052 current_scope->warned_forward_parm_decls = true;
3055 for (b = current_scope->bindings; b; b = b->prev)
3056 if (TREE_CODE (b->decl) == PARM_DECL)
3057 TREE_ASM_WRITTEN (b->decl) = 1;
3060 static GTY(()) int compound_literal_number;
3062 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3063 literal, which may be an incomplete array type completed by the
3064 initializer; INIT is a CONSTRUCTOR that initializes the compound
3068 build_compound_literal (tree type, tree init)
3070 /* We do not use start_decl here because we have a type, not a declarator;
3071 and do not use finish_decl because the decl should be stored inside
3072 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3073 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3076 DECL_EXTERNAL (decl) = 0;
3077 TREE_PUBLIC (decl) = 0;
3078 TREE_STATIC (decl) = (current_scope == file_scope);
3079 DECL_CONTEXT (decl) = current_function_decl;
3080 TREE_USED (decl) = 1;
3081 TREE_TYPE (decl) = type;
3082 TREE_READONLY (decl) = TYPE_READONLY (type);
3083 store_init_value (decl, init);
3085 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3087 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3092 type = TREE_TYPE (decl);
3093 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3094 return error_mark_node;
3096 stmt = build_stmt (DECL_EXPR, decl);
3097 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3098 TREE_SIDE_EFFECTS (complit) = 1;
3100 layout_decl (decl, 0);
3102 if (TREE_STATIC (decl))
3104 /* This decl needs a name for the assembler output. We also need
3105 a unique suffix to be added to the name. */
3108 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3109 compound_literal_number);
3110 compound_literal_number++;
3111 DECL_NAME (decl) = get_identifier (name);
3112 DECL_DEFER_OUTPUT (decl) = 1;
3113 DECL_COMDAT (decl) = 1;
3114 DECL_ARTIFICIAL (decl) = 1;
3116 rest_of_decl_compilation (decl, NULL, 1, 0);
3122 /* Make TYPE a complete type based on INITIAL_VALUE.
3123 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3124 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3127 complete_array_type (tree type, tree initial_value, int do_default)
3129 tree maxindex = NULL_TREE;
3134 /* Note MAXINDEX is really the maximum index,
3135 one less than the size. */
3136 if (TREE_CODE (initial_value) == STRING_CST)
3139 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3140 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3143 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3145 tree elts = CONSTRUCTOR_ELTS (initial_value);
3146 maxindex = build_int_2 (-1, -1);
3147 for (; elts; elts = TREE_CHAIN (elts))
3149 if (TREE_PURPOSE (elts))
3150 maxindex = TREE_PURPOSE (elts);
3152 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3153 maxindex, integer_one_node));
3155 maxindex = copy_node (maxindex);
3159 /* Make an error message unless that happened already. */
3160 if (initial_value != error_mark_node)
3163 /* Prevent further error messages. */
3164 maxindex = build_int_2 (0, 0);
3171 maxindex = build_int_2 (0, 0);
3177 TYPE_DOMAIN (type) = build_index_type (maxindex);
3178 if (!TREE_TYPE (maxindex))
3179 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3182 /* Lay out the type now that we can get the real answer. */
3189 /* Determine whether TYPE is a structure with a flexible array member,
3190 or a union containing such a structure (possibly recursively). */
3193 flexible_array_type_p (tree type)
3196 switch (TREE_CODE (type))
3199 x = TYPE_FIELDS (type);
3202 while (TREE_CHAIN (x) != NULL_TREE)
3204 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3205 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3206 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3207 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3211 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3213 if (flexible_array_type_p (TREE_TYPE (x)))
3222 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3223 replacing with appropriate values if they are invalid. */
3225 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3228 unsigned int max_width;
3229 unsigned HOST_WIDE_INT w;
3230 const char *name = orig_name ? orig_name: _("<anonymous>");
3233 STRIP_NOPS (*width);
3235 /* Detect and ignore out of range field width and process valid
3237 if (TREE_CODE (*width) != INTEGER_CST)
3239 error ("bit-field `%s' width not an integer constant", name);
3240 *width = integer_one_node;
3244 constant_expression_warning (*width);
3245 if (tree_int_cst_sgn (*width) < 0)
3247 error ("negative width in bit-field `%s'", name);
3248 *width = integer_one_node;
3250 else if (integer_zerop (*width) && orig_name)
3252 error ("zero width for bit-field `%s'", name);
3253 *width = integer_one_node;
3257 /* Detect invalid bit-field type. */
3258 if (TREE_CODE (*type) != INTEGER_TYPE
3259 && TREE_CODE (*type) != BOOLEAN_TYPE
3260 && TREE_CODE (*type) != ENUMERAL_TYPE)
3262 error ("bit-field `%s' has invalid type", name);
3263 *type = unsigned_type_node;
3266 type_mv = TYPE_MAIN_VARIANT (*type);
3268 && type_mv != integer_type_node
3269 && type_mv != unsigned_type_node
3270 && type_mv != boolean_type_node)
3271 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3273 if (type_mv == boolean_type_node)
3274 max_width = CHAR_TYPE_SIZE;
3276 max_width = TYPE_PRECISION (*type);
3278 if (0 < compare_tree_int (*width, max_width))
3280 error ("width of `%s' exceeds its type", name);
3282 *width = build_int_2 (w, 0);
3285 w = tree_low_cst (*width, 1);
3287 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3289 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3291 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3292 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3293 warning ("`%s' is narrower than values of its type", name);
3297 /* Given declspecs and a declarator,
3298 determine the name and type of the object declared
3299 and construct a ..._DECL node for it.
3300 (In one case we can return a ..._TYPE node instead.
3301 For invalid input we sometimes return 0.)
3303 DECLSPECS is a chain of tree_list nodes whose value fields
3304 are the storage classes and type specifiers.
3306 DECL_CONTEXT says which syntactic context this declaration is in:
3307 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3308 FUNCDEF for a function definition. Like NORMAL but a few different
3309 error messages in each case. Return value may be zero meaning
3310 this definition is too screwy to try to parse.
3311 PARM for a parameter declaration (either within a function prototype
3312 or before a function body). Make a PARM_DECL, or return void_type_node.
3313 TYPENAME if for a typename (in a cast or sizeof).
3314 Don't make a DECL node; just return the ..._TYPE node.
3315 FIELD for a struct or union field; make a FIELD_DECL.
3316 INITIALIZED is 1 if the decl has an initializer.
3317 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3318 representing the width of the bit-field.
3320 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3321 It may also be so in the PARM case, for a prototype where the
3322 argument type is specified but not the name.
3324 This function is where the complicated C meanings of `static'
3325 and `extern' are interpreted. */
3328 grokdeclarator (tree declarator, tree declspecs,
3329 enum decl_context decl_context, int initialized, tree *width)
3333 tree type = NULL_TREE;
3338 int type_quals = TYPE_UNQUALIFIED;
3340 int explicit_int = 0;
3341 int explicit_char = 0;
3342 int defaulted_int = 0;
3343 tree typedef_decl = 0;
3344 const char *name, *orig_name;
3345 tree typedef_type = 0;
3346 int funcdef_flag = 0;
3347 enum tree_code innermost_code = ERROR_MARK;
3348 int size_varies = 0;
3349 tree decl_attr = NULL_TREE;
3350 tree array_ptr_quals = NULL_TREE;
3351 int array_parm_static = 0;
3352 tree returned_attrs = NULL_TREE;
3353 bool bitfield = width != NULL;
3355 tree arg_info = NULL_TREE;
3357 if (decl_context == FUNCDEF)
3358 funcdef_flag = 1, decl_context = NORMAL;
3360 /* Look inside a declarator for the name being declared
3361 and get it as a string, for an error message. */
3363 tree decl = declarator;
3367 switch (TREE_CODE (decl))
3372 innermost_code = TREE_CODE (decl);
3373 decl = TREE_OPERAND (decl, 0);
3377 decl = TREE_VALUE (decl);
3380 case IDENTIFIER_NODE:
3381 name = IDENTIFIER_POINTER (decl);
3393 /* A function definition's declarator must have the form of
3394 a function declarator. */
3396 if (funcdef_flag && innermost_code != CALL_EXPR)
3399 /* If this looks like a function definition, make it one,
3400 even if it occurs where parms are expected.
3401 Then store_parm_decls will reject it and not use it as a parm. */
3402 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3403 decl_context = PARM;
3405 /* Look through the decl specs and record which ones appear.
3406 Some typespecs are defined as built-in typenames.
3407 Others, the ones that are modifiers of other types,
3408 are represented by bits in SPECBITS: set the bits for
3409 the modifiers that appear. Storage class keywords are also in SPECBITS.
3411 If there is a typedef name or a type, store the type in TYPE.
3412 This includes builtin typedefs such as `int'.
3414 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3415 and did not come from a user typedef.
3417 Set LONGLONG if `long' is mentioned twice. */
3419 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3421 tree id = TREE_VALUE (spec);
3423 /* If the entire declaration is itself tagged as deprecated then
3424 suppress reports of deprecated items. */
3425 if (id && TREE_DEPRECATED (id))
3427 if (deprecated_state != DEPRECATED_SUPPRESS)
3428 warn_deprecated_use (id);
3431 if (id == ridpointers[(int) RID_INT])
3433 if (id == ridpointers[(int) RID_CHAR])
3436 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3438 enum rid i = C_RID_CODE (id);
3439 if ((int) i <= (int) RID_LAST_MODIFIER)
3441 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3444 error ("`long long long' is too long for GCC");
3447 if (pedantic && !flag_isoc99 && ! in_system_header
3449 pedwarn ("ISO C90 does not support `long long'");
3453 else if (specbits & (1 << (int) i))
3455 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3457 if (pedantic && !flag_isoc99)
3458 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3461 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3464 /* Diagnose "__thread extern". Recall that this list
3465 is in the reverse order seen in the text. */
3467 && (specbits & (1 << (int) RID_EXTERN
3468 | 1 << (int) RID_STATIC)))
3470 if (specbits & 1 << (int) RID_EXTERN)
3471 error ("`__thread' before `extern'");
3473 error ("`__thread' before `static'");
3476 specbits |= 1 << (int) i;
3481 error ("two or more data types in declaration of `%s'", name);
3482 /* Actual typedefs come to us as TYPE_DECL nodes. */
3483 else if (TREE_CODE (id) == TYPE_DECL)
3485 if (TREE_TYPE (id) == error_mark_node)
3486 ; /* Allow the type to default to int to avoid cascading errors. */
3489 type = TREE_TYPE (id);
3490 decl_attr = DECL_ATTRIBUTES (id);
3494 /* Built-in types come as identifiers. */
3495 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3497 tree t = lookup_name (id);
3498 if (!t || TREE_CODE (t) != TYPE_DECL)
3499 error ("`%s' fails to be a typedef or built in type",
3500 IDENTIFIER_POINTER (id));
3501 else if (TREE_TYPE (t) == error_mark_node)
3505 type = TREE_TYPE (t);
3509 else if (TREE_CODE (id) != ERROR_MARK)
3516 typedef_type = type;
3518 size_varies = C_TYPE_VARIABLE_SIZE (type);
3520 /* No type at all: default to `int', and set DEFAULTED_INT
3521 because it was not a user-defined typedef. */
3525 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3526 | (1 << (int) RID_SIGNED)
3527 | (1 << (int) RID_UNSIGNED)
3528 | (1 << (int) RID_COMPLEX))))
3529 /* Don't warn about typedef foo = bar. */
3530 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3531 && ! in_system_header)
3533 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3534 and this is a function, or if -Wimplicit; prefer the former
3535 warning since it is more explicit. */
3536 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3538 warn_about_return_type = 1;
3539 else if (warn_implicit_int || flag_isoc99)
3540 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3545 type = integer_type_node;
3548 /* Now process the modifiers that were specified
3549 and check for invalid combinations. */
3551 /* Long double is a special combination. */
3553 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3554 && TYPE_MAIN_VARIANT (type) == double_type_node)
3556 specbits &= ~(1 << (int) RID_LONG);
3557 type = long_double_type_node;
3560 /* Check all other uses of type modifiers. */
3562 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3563 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3567 if ((specbits & 1 << (int) RID_LONG)
3568 && (specbits & 1 << (int) RID_SHORT))
3569 error ("both long and short specified for `%s'", name);
3570 else if (((specbits & 1 << (int) RID_LONG)
3571 || (specbits & 1 << (int) RID_SHORT))
3573 error ("long or short specified with char for `%s'", name);
3574 else if (((specbits & 1 << (int) RID_LONG)
3575 || (specbits & 1 << (int) RID_SHORT))
3576 && TREE_CODE (type) == REAL_TYPE)
3578 static int already = 0;
3580 error ("long or short specified with floating type for `%s'", name);
3581 if (! already && ! pedantic)
3583 error ("the only valid combination is `long double'");
3587 else if ((specbits & 1 << (int) RID_SIGNED)
3588 && (specbits & 1 << (int) RID_UNSIGNED))
3589 error ("both signed and unsigned specified for `%s'", name);
3590 else if (TREE_CODE (type) != INTEGER_TYPE)
3591 error ("long, short, signed or unsigned invalid for `%s'", name);
3595 if (!explicit_int && !defaulted_int && !explicit_char)
3597 error ("long, short, signed or unsigned used invalidly for `%s'",
3603 /* Discard the type modifiers if they are invalid. */
3606 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3607 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3612 if ((specbits & (1 << (int) RID_COMPLEX))
3613 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3615 error ("complex invalid for `%s'", name);
3616 specbits &= ~(1 << (int) RID_COMPLEX);
3619 /* Decide whether an integer type is signed or not.
3620 Optionally treat bit-fields as signed by default. */
3621 if (specbits & 1 << (int) RID_UNSIGNED
3622 || (bitfield && ! flag_signed_bitfields
3623 && (explicit_int || defaulted_int || explicit_char
3624 /* A typedef for plain `int' without `signed'
3625 can be controlled just like plain `int'. */
3626 || ! (typedef_decl != 0
3627 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3628 && TREE_CODE (type) != ENUMERAL_TYPE
3629 && !(specbits & 1 << (int) RID_SIGNED)))
3632 type = long_long_unsigned_type_node;
3633 else if (specbits & 1 << (int) RID_LONG)
3634 type = long_unsigned_type_node;
3635 else if (specbits & 1 << (int) RID_SHORT)
3636 type = short_unsigned_type_node;
3637 else if (type == char_type_node)
3638 type = unsigned_char_type_node;
3639 else if (typedef_decl)
3640 type = c_common_unsigned_type (type);
3642 type = unsigned_type_node;
3644 else if ((specbits & 1 << (int) RID_SIGNED)
3645 && type == char_type_node)
3646 type = signed_char_type_node;
3648 type = long_long_integer_type_node;
3649 else if (specbits & 1 << (int) RID_LONG)
3650 type = long_integer_type_node;
3651 else if (specbits & 1 << (int) RID_SHORT)
3652 type = short_integer_type_node;
3654 if (specbits & 1 << (int) RID_COMPLEX)
3656 if (pedantic && !flag_isoc99)
3657 pedwarn ("ISO C90 does not support complex types");
3658 /* If we just have "complex", it is equivalent to
3659 "complex double", but if any modifiers at all are specified it is
3660 the complex form of TYPE. E.g, "complex short" is
3661 "complex short int". */
3663 if (defaulted_int && ! longlong
3664 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3665 | (1 << (int) RID_SIGNED)
3666 | (1 << (int) RID_UNSIGNED))))
3669 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3670 type = complex_double_type_node;
3672 else if (type == integer_type_node)
3675 pedwarn ("ISO C does not support complex integer types");
3676 type = complex_integer_type_node;
3678 else if (type == float_type_node)
3679 type = complex_float_type_node;
3680 else if (type == double_type_node)
3681 type = complex_double_type_node;
3682 else if (type == long_double_type_node)
3683 type = complex_long_double_type_node;
3687 pedwarn ("ISO C does not support complex integer types");
3688 type = build_complex_type (type);
3692 /* Check the type and width of a bit-field. */
3694 check_bitfield_type_and_width (&type, width, orig_name);
3696 /* Figure out the type qualifiers for the declaration. There are
3697 two ways a declaration can become qualified. One is something
3698 like `const int i' where the `const' is explicit. Another is
3699 something like `typedef const int CI; CI i' where the type of the
3700 declaration contains the `const'. A third possibility is that
3701 there is a type qualifier on the element type of a typedefed
3702 array type, in which case we should extract that qualifier so
3703 that c_apply_type_quals_to_decls receives the full list of
3704 qualifiers to work with (C90 is not entirely clear about whether
3705 duplicate qualifiers should be diagnosed in this case, but it
3706 seems most appropriate to do so). */
3707 element_type = strip_array_types (type);
3708 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3710 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3712 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3713 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3714 if (pedantic && !flag_isoc99)
3717 pedwarn ("duplicate `const'");
3719 pedwarn ("duplicate `restrict'");
3721 pedwarn ("duplicate `volatile'");
3723 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3724 type = TYPE_MAIN_VARIANT (type);
3725 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3726 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3727 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3729 /* Warn if two storage classes are given. Default to `auto'. */
3734 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3735 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3736 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3737 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3738 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3740 /* "static __thread" and "extern __thread" are allowed. */
3741 if ((specbits & (1 << (int) RID_THREAD
3742 | 1 << (int) RID_STATIC
3743 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3746 /* Warn about storage classes that are invalid for certain
3747 kinds of declarations (parameters, typenames, etc.). */
3750 error ("multiple storage classes in declaration of `%s'", name);
3751 else if (funcdef_flag
3753 & ((1 << (int) RID_REGISTER)
3754 | (1 << (int) RID_AUTO)
3755 | (1 << (int) RID_TYPEDEF)
3756 | (1 << (int) RID_THREAD))))
3758 if (specbits & 1 << (int) RID_AUTO
3759 && (pedantic || current_scope == file_scope))
3760 pedwarn ("function definition declared `auto'");
3761 if (specbits & 1 << (int) RID_REGISTER)
3762 error ("function definition declared `register'");
3763 if (specbits & 1 << (int) RID_TYPEDEF)
3764 error ("function definition declared `typedef'");
3765 if (specbits & 1 << (int) RID_THREAD)
3766 error ("function definition declared `__thread'");
3767 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3768 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3770 else if (decl_context != NORMAL && nclasses > 0)
3772 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3776 switch (decl_context)
3779 error ("storage class specified for structure field `%s'",
3783 error ("storage class specified for parameter `%s'", name);
3786 error ("storage class specified for typename");
3789 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3790 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3791 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3794 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3796 /* `extern' with initialization is invalid if not at file scope. */
3797 if (current_scope == file_scope)
3798 warning ("`%s' initialized and declared `extern'", name);
3800 error ("`%s' has both `extern' and initializer", name);
3802 else if (current_scope == file_scope)
3804 if (specbits & 1 << (int) RID_AUTO)
3805 error ("file-scope declaration of `%s' specifies `auto'", name);
3809 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3810 error ("nested function `%s' declared `extern'", name);
3811 else if ((specbits & (1 << (int) RID_THREAD
3812 | 1 << (int) RID_EXTERN
3813 | 1 << (int) RID_STATIC))
3814 == (1 << (int) RID_THREAD))
3816 error ("function-scope `%s' implicitly auto and declared `__thread'",
3818 specbits &= ~(1 << (int) RID_THREAD);
3823 /* Now figure out the structure of the declarator proper.
3824 Descend through it, creating more complex types, until we reach
3825 the declared identifier (or NULL_TREE, in an absolute declarator). */
3827 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3829 if (type == error_mark_node)
3831 declarator = TREE_OPERAND (declarator, 0);
3835 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3836 an INDIRECT_REF (for *...),
3837 a CALL_EXPR (for ...(...)),
3838 a TREE_LIST (for nested attributes),
3839 an identifier (for the name being declared)
3840 or a null pointer (for the place in an absolute declarator
3841 where the name was omitted).
3842 For the last two cases, we have just exited the loop.
3844 At this point, TYPE is the type of elements of an array,
3845 or for a function to return, or for a pointer to point to.
3846 After this sequence of ifs, TYPE is the type of the
3847 array or function or pointer, and DECLARATOR has had its
3848 outermost layer removed. */
3850 if (array_ptr_quals != NULL_TREE || array_parm_static)
3852 /* Only the innermost declarator (making a parameter be of
3853 array type which is converted to pointer type)
3854 may have static or type qualifiers. */
3855 error ("static or type qualifiers in non-parameter array declarator");
3856 array_ptr_quals = NULL_TREE;
3857 array_parm_static = 0;
3860 if (TREE_CODE (declarator) == TREE_LIST)
3862 /* We encode a declarator with embedded attributes using
3864 tree attrs = TREE_PURPOSE (declarator);
3867 declarator = TREE_VALUE (declarator);
3868 inner_decl = declarator;
3869 while (inner_decl != NULL_TREE
3870 && TREE_CODE (inner_decl) == TREE_LIST)
3871 inner_decl = TREE_VALUE (inner_decl);
3872 if (inner_decl == NULL_TREE
3873 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3874 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3875 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3876 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3877 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3878 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3879 returned_attrs = decl_attributes (&type,
3880 chainon (returned_attrs, attrs),
3883 else if (TREE_CODE (declarator) == ARRAY_REF)
3885 tree itype = NULL_TREE;
3886 tree size = TREE_OPERAND (declarator, 1);
3887 /* The index is a signed object `sizetype' bits wide. */
3888 tree index_type = c_common_signed_type (sizetype);
3890 array_ptr_quals = TREE_TYPE (declarator);
3891 array_parm_static = TREE_STATIC (declarator);
3893 declarator = TREE_OPERAND (declarator, 0);
3895 /* Check for some types that there cannot be arrays of. */
3897 if (VOID_TYPE_P (type))
3899 error ("declaration of `%s' as array of voids", name);
3900 type = error_mark_node;
3903 if (TREE_CODE (type) == FUNCTION_TYPE)
3905 error ("declaration of `%s' as array of functions", name);
3906 type = error_mark_node;
3909 if (pedantic && !in_system_header && flexible_array_type_p (type))
3910 pedwarn ("invalid use of structure with flexible array member");
3912 if (size == error_mark_node)
3913 type = error_mark_node;
3915 if (type == error_mark_node)
3918 /* If size was specified, set ITYPE to a range-type for that size.
3919 Otherwise, ITYPE remains null. finish_decl may figure it out
3920 from an initial value. */
3924 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3925 STRIP_TYPE_NOPS (size);
3927 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3929 error ("size of array `%s' has non-integer type", name);
3930 size = integer_one_node;
3933 if (pedantic && integer_zerop (size))
3934 pedwarn ("ISO C forbids zero-size array `%s'", name);
3936 if (TREE_CODE (size) == INTEGER_CST)
3938 constant_expression_warning (size);
3939 if (tree_int_cst_sgn (size) < 0)
3941 error ("size of array `%s' is negative", name);
3942 size = integer_one_node;
3947 /* Make sure the array size remains visibly nonconstant
3948 even if it is (eg) a const variable with known value. */
3951 if (!flag_isoc99 && pedantic)
3953 if (TREE_CONSTANT (size))
3954 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3957 pedwarn ("ISO C90 forbids variable-size array `%s'",
3962 if (integer_zerop (size))
3964 /* A zero-length array cannot be represented with an
3965 unsigned index type, which is what we'll get with
3966 build_index_type. Create an open-ended range instead. */
3967 itype = build_range_type (sizetype, size, NULL_TREE);
3971 /* Compute the maximum valid index, that is, size - 1.
3972 Do the calculation in index_type, so that if it is
3973 a variable the computations will be done in the
3975 itype = fold (build (MINUS_EXPR, index_type,
3976 convert (index_type, size),
3977 convert (index_type, size_one_node)));
3979 /* If that overflowed, the array is too big.
3980 ??? While a size of INT_MAX+1 technically shouldn't
3981 cause an overflow (because we subtract 1), the overflow
3982 is recorded during the conversion to index_type, before
3983 the subtraction. Handling this case seems like an
3984 unnecessary complication. */
3985 if (TREE_OVERFLOW (itype))
3987 error ("size of array `%s' is too large", name);
3988 type = error_mark_node;
3993 itype = variable_size (itype);
3994 itype = build_index_type (itype);
3997 else if (decl_context == FIELD)
3999 if (pedantic && !flag_isoc99 && !in_system_header)
4000 pedwarn ("ISO C90 does not support flexible array members");
4002 /* ISO C99 Flexible array members are effectively identical
4003 to GCC's zero-length array extension. */
4004 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4007 /* If pedantic, complain about arrays of incomplete types. */
4009 if (pedantic && !COMPLETE_TYPE_P (type))
4010 pedwarn ("array type has incomplete element type");
4012 /* Build the array type itself, then merge any constancy or
4013 volatility into the target type. We must do it in this order
4014 to ensure that the TYPE_MAIN_VARIANT field of the array type
4015 is set correctly. */
4017 type = build_array_type (type, itype);
4019 type = c_build_qualified_type (type, type_quals);
4022 C_TYPE_VARIABLE_SIZE (type) = 1;
4024 /* The GCC extension for zero-length arrays differs from
4025 ISO flexible array members in that sizeof yields zero. */
4026 if (size && integer_zerop (size))
4029 TYPE_SIZE (type) = bitsize_zero_node;
4030 TYPE_SIZE_UNIT (type) = size_zero_node;
4032 else if (declarator && TREE_CODE (declarator) == INDIRECT_REF)
4033 /* We can never complete an array type which is the target of a
4034 pointer, so go ahead and lay it out. */
4037 if (decl_context != PARM
4038 && (array_ptr_quals != NULL_TREE || array_parm_static))
4040 error ("static or type qualifiers in non-parameter array declarator");
4041 array_ptr_quals = NULL_TREE;
4042 array_parm_static = 0;
4045 else if (TREE_CODE (declarator) == CALL_EXPR)
4047 /* Say it's a definition only for the CALL_EXPR closest to
4049 bool really_funcdef = (funcdef_flag
4050 && (TREE_CODE (TREE_OPERAND (declarator, 0))
4051 == IDENTIFIER_NODE));
4054 /* Declaring a function type.
4055 Make sure we have a valid type for the function to return. */
4056 if (type == error_mark_node)
4061 /* Warn about some types functions can't return. */
4063 if (TREE_CODE (type) == FUNCTION_TYPE)
4065 error ("`%s' declared as function returning a function", name);
4066 type = integer_type_node;
4068 if (TREE_CODE (type) == ARRAY_TYPE)
4070 error ("`%s' declared as function returning an array", name);
4071 type = integer_type_node;
4074 /* Construct the function type and go to the next
4075 inner layer of declarator. */
4076 arg_info = TREE_OPERAND (declarator, 1);
4077 arg_types = grokparms (arg_info, really_funcdef);
4079 /* Type qualifiers before the return type of the function
4080 qualify the return type, not the function type. */
4083 /* Type qualifiers on a function return type are normally
4084 permitted by the standard but have no effect, so give a
4085 warning at -Wextra. Qualifiers on a void return type have
4086 meaning as a GNU extension, and are banned on function
4087 definitions in ISO C. FIXME: strictly we shouldn't
4088 pedwarn for qualified void return types except on function
4089 definitions, but not doing so could lead to the undesirable
4090 state of a "volatile void" function return type not being
4091 warned about, and a use of the function being compiled
4092 with GNU semantics, with no diagnostics under -pedantic. */
4093 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4094 pedwarn ("ISO C forbids qualified void function return type");
4095 else if (extra_warnings
4096 && !(VOID_TYPE_P (type)
4097 && type_quals == TYPE_QUAL_VOLATILE))
4098 warning ("type qualifiers ignored on function return type");
4100 type = c_build_qualified_type (type, type_quals);
4102 type_quals = TYPE_UNQUALIFIED;
4104 type = build_function_type (type, arg_types);
4105 declarator = TREE_OPERAND (declarator, 0);
4107 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4108 the formal parameter list of this FUNCTION_TYPE to point to
4109 the FUNCTION_TYPE node itself. */
4114 for (link = ARG_INFO_TAGS (arg_info);
4116 link = TREE_CHAIN (link))
4117 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4120 else if (TREE_CODE (declarator) == INDIRECT_REF)
4122 /* Merge any constancy or volatility into the target type
4125 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4127 pedwarn ("ISO C forbids qualified function types");
4129 type = c_build_qualified_type (type, type_quals);
4130 type_quals = TYPE_UNQUALIFIED;
4133 type = build_pointer_type (type);
4135 /* Process a list of type modifier keywords
4136 (such as const or volatile) that were given inside the `*'. */
4138 if (TREE_TYPE (declarator))
4146 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4147 typemodlist = TREE_CHAIN (typemodlist))
4149 tree qualifier = TREE_VALUE (typemodlist);
4151 if (C_IS_RESERVED_WORD (qualifier))
4153 if (C_RID_CODE (qualifier) == RID_CONST)
4155 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4157 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4167 error ("invalid type modifier within pointer declarator");
4168 if (pedantic && !flag_isoc99)
4171 pedwarn ("duplicate `const'");
4173 pedwarn ("duplicate `volatile'");
4175 pedwarn ("duplicate `restrict'");
4178 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4179 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4180 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4183 declarator = TREE_OPERAND (declarator, 0);
4190 /* Now TYPE has the actual type. */
4192 /* Did array size calculations overflow? */
4194 if (TREE_CODE (type) == ARRAY_TYPE
4195 && COMPLETE_TYPE_P (type)
4196 && TREE_OVERFLOW (TYPE_SIZE (type)))
4198 error ("size of array `%s' is too large", name);
4199 /* If we proceed with the array type as it is, we'll eventually
4200 crash in tree_low_cst(). */
4201 type = error_mark_node;
4204 /* If this is declaring a typedef name, return a TYPE_DECL. */
4206 if (specbits & (1 << (int) RID_TYPEDEF))
4209 /* Note that the grammar rejects storage classes
4210 in typenames, fields or parameters */
4211 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4213 pedwarn ("ISO C forbids qualified function types");
4215 type = c_build_qualified_type (type, type_quals);
4216 decl = build_decl (TYPE_DECL, declarator, type);
4217 if ((specbits & (1 << (int) RID_SIGNED))
4218 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4219 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4220 decl_attributes (&decl, returned_attrs, 0);
4224 /* Detect the case of an array type of unspecified size
4225 which came, as such, direct from a typedef name.
4226 We must copy the type, so that each identifier gets
4227 a distinct type, so that each identifier's size can be
4228 controlled separately by its own initializer. */
4230 if (type != 0 && typedef_type != 0
4231 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4232 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4234 type = build_array_type (TREE_TYPE (type), 0);
4236 C_TYPE_VARIABLE_SIZE (type) = 1;
4239 /* If this is a type name (such as, in a cast or sizeof),
4240 compute the type and return it now. */
4242 if (decl_context == TYPENAME)
4244 /* Note that the grammar rejects storage classes
4245 in typenames, fields or parameters */
4246 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4248 pedwarn ("ISO C forbids const or volatile function types");
4250 type = c_build_qualified_type (type, type_quals);
4251 decl_attributes (&type, returned_attrs, 0);
4255 /* Aside from typedefs and type names (handle above),
4256 `void' at top level (not within pointer)
4257 is allowed only in public variables.
4258 We don't complain about parms either, but that is because
4259 a better error message can be made later. */
4261 if (VOID_TYPE_P (type) && decl_context != PARM
4262 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4263 && ((specbits & (1 << (int) RID_EXTERN))
4264 || (current_scope == file_scope
4266 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4268 error ("variable or field `%s' declared void", name);
4269 type = integer_type_node;
4272 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4273 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4278 if (decl_context == PARM)
4280 tree type_as_written;
4283 /* A parameter declared as an array of T is really a pointer to T.
4284 One declared as a function is really a pointer to a function. */
4286 if (TREE_CODE (type) == ARRAY_TYPE)
4288 /* Transfer const-ness of array into that of type pointed to. */
4289 type = TREE_TYPE (type);
4291 type = c_build_qualified_type (type, type_quals);
4292 type = build_pointer_type (type);
4293 type_quals = TYPE_UNQUALIFIED;
4294 if (array_ptr_quals)
4296 tree new_ptr_quals, new_ptr_attrs;
4298 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4299 /* We don't yet implement attributes in this context. */
4300 if (new_ptr_attrs != NULL_TREE)
4301 warning ("attributes in parameter array declarator ignored");
4306 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4308 tree qualifier = TREE_VALUE (new_ptr_quals);
4310 if (C_IS_RESERVED_WORD (qualifier))
4312 if (C_RID_CODE (qualifier) == RID_CONST)
4314 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4316 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4326 error ("invalid type modifier within array declarator");
4328 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4329 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4330 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4334 else if (TREE_CODE (type) == FUNCTION_TYPE)
4336 if (pedantic && type_quals)
4337 pedwarn ("ISO C forbids qualified function types");
4339 type = c_build_qualified_type (type, type_quals);
4340 type = build_pointer_type (type);
4341 type_quals = TYPE_UNQUALIFIED;
4343 else if (type_quals)
4344 type = c_build_qualified_type (type, type_quals);
4346 type_as_written = type;
4348 decl = build_decl (PARM_DECL, declarator, type);
4350 C_DECL_VARIABLE_SIZE (decl) = 1;
4352 /* Compute the type actually passed in the parmlist,
4353 for the case where there is no prototype.
4354 (For example, shorts and chars are passed as ints.)
4355 When there is a prototype, this is overridden later. */
4357 if (type == error_mark_node)
4358 promoted_type = type;
4360 promoted_type = c_type_promotes_to (type);
4362 DECL_ARG_TYPE (decl) = promoted_type;
4363 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4365 else if (decl_context == FIELD)
4367 /* Structure field. It may not be a function. */
4369 if (TREE_CODE (type) == FUNCTION_TYPE)
4371 error ("field `%s' declared as a function", name);
4372 type = build_pointer_type (type);
4374 else if (TREE_CODE (type) != ERROR_MARK
4375 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4377 error ("field `%s' has incomplete type", name);
4378 type = error_mark_node;
4380 /* Move type qualifiers down to element of an array. */
4381 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4382 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4384 TYPE_DOMAIN (type));
4385 decl = build_decl (FIELD_DECL, declarator, type);
4386 DECL_NONADDRESSABLE_P (decl) = bitfield;
4389 C_DECL_VARIABLE_SIZE (decl) = 1;
4391 else if (TREE_CODE (type) == FUNCTION_TYPE)
4393 /* Every function declaration is "external"
4394 except for those which are inside a function body
4395 in which `auto' is used.
4396 That is a case not specified by ANSI C,
4397 and we use it for forward declarations for nested functions. */
4398 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4399 || current_scope == file_scope);
4401 if (specbits & (1 << (int) RID_AUTO)
4402 && (pedantic || current_scope == file_scope))
4403 pedwarn ("invalid storage class for function `%s'", name);
4404 if (specbits & (1 << (int) RID_REGISTER))
4405 error ("invalid storage class for function `%s'", name);
4406 if (specbits & (1 << (int) RID_THREAD))
4407 error ("invalid storage class for function `%s'", name);
4408 /* Function declaration not at file scope.
4409 Storage classes other than `extern' are not allowed
4410 and `extern' makes no difference. */
4411 if (current_scope != file_scope
4412 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4414 pedwarn ("invalid storage class for function `%s'", name);
4416 decl = build_decl (FUNCTION_DECL, declarator, type);
4417 decl = build_decl_attribute_variant (decl, decl_attr);
4419 DECL_LANG_SPECIFIC (decl)
4420 = ggc_alloc_cleared (sizeof (struct lang_decl));
4422 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4423 pedwarn ("ISO C forbids qualified function types");
4425 /* GNU C interprets a `volatile void' return type to indicate
4426 that the function does not return. */
4427 if ((type_quals & TYPE_QUAL_VOLATILE)
4428 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4429 warning ("`noreturn' function returns non-void value");
4432 DECL_EXTERNAL (decl) = 1;
4433 /* Record absence of global scope for `static' or `auto'. */
4435 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4437 /* For a function definition, record the argument information
4438 block in DECL_ARGUMENTS where store_parm_decls will look
4441 DECL_ARGUMENTS (decl) = arg_info;
4444 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4446 /* Record presence of `inline', if it is reasonable. */
4447 if (MAIN_NAME_P (declarator))
4450 warning ("cannot inline function `main'");
4454 /* Record that the function is declared `inline'. */
4455 DECL_DECLARED_INLINE_P (decl) = 1;
4457 /* Do not mark bare declarations as DECL_INLINE. Doing so
4458 in the presence of multiple declarations can result in
4459 the abstract origin pointing between the declarations,
4460 which will confuse dwarf2out. */
4463 DECL_INLINE (decl) = 1;
4464 if (specbits & (1 << (int) RID_EXTERN))
4465 current_extern_inline = 1;
4468 /* If -finline-functions, assume it can be inlined. This does
4469 two things: let the function be deferred until it is actually
4470 needed, and let dwarf2 know that the function is inlinable. */
4471 else if (flag_inline_trees == 2 && initialized)
4472 DECL_INLINE (decl) = 1;
4476 /* It's a variable. */
4477 /* An uninitialized decl with `extern' is a reference. */
4478 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4480 /* Move type qualifiers down to element of an array. */
4481 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4483 int saved_align = TYPE_ALIGN(type);
4484 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4486 TYPE_DOMAIN (type));
4487 TYPE_ALIGN (type) = saved_align;
4489 else if (type_quals)
4490 type = c_build_qualified_type (type, type_quals);
4492 /* C99 6.2.2p7: It is invalid (compile-time undefined
4493 behavior) to create an 'extern' declaration for a
4494 variable if there is a global declaration that is
4495 'static' and the global declaration is not visible.
4496 (If the static declaration _is_ currently visible,
4497 the 'extern' declaration is taken to refer to that decl.) */
4498 if (extern_ref && current_scope != file_scope)
4500 tree global_decl = identifier_global_value (declarator);
4501 tree visible_decl = lookup_name (declarator);
4504 && global_decl != visible_decl
4505 && TREE_CODE (global_decl) == VAR_DECL
4506 && !TREE_PUBLIC (global_decl))
4507 error ("variable previously declared 'static' redeclared "
4511 decl = build_decl (VAR_DECL, declarator, type);
4513 C_DECL_VARIABLE_SIZE (decl) = 1;
4516 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4518 DECL_EXTERNAL (decl) = extern_ref;
4520 /* At file scope, the presence of a `static' or `register' storage
4521 class specifier, or the absence of all storage class specifiers
4522 makes this declaration a definition (perhaps tentative). Also,
4523 the absence of both `static' and `register' makes it public. */
4524 if (current_scope == file_scope)
4526 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4527 | (1 << (int) RID_REGISTER)));
4528 TREE_STATIC (decl) = !extern_ref;
4530 /* Not at file scope, only `static' makes a static definition. */
4533 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4534 TREE_PUBLIC (decl) = extern_ref;
4537 if (specbits & 1 << (int) RID_THREAD)
4539 if (targetm.have_tls)
4540 DECL_THREAD_LOCAL (decl) = 1;
4542 /* A mere warning is sure to result in improper semantics
4543 at runtime. Don't bother to allow this to compile. */
4544 error ("thread-local storage not supported for this target");
4548 /* Record `register' declaration for warnings on &
4549 and in case doing stupid register allocation. */
4551 if (specbits & (1 << (int) RID_REGISTER))
4553 C_DECL_REGISTER (decl) = 1;
4554 DECL_REGISTER (decl) = 1;
4557 /* Record constancy and volatility. */
4558 c_apply_type_quals_to_decl (type_quals, decl);
4560 /* If a type has volatile components, it should be stored in memory.
4561 Otherwise, the fact that those components are volatile
4562 will be ignored, and would even crash the compiler. */
4563 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4565 /* It is not an error for a structure with volatile fields to
4566 be declared register, but reset DECL_REGISTER since it
4567 cannot actually go in a register. */
4568 int was_reg = C_DECL_REGISTER (decl);
4569 C_DECL_REGISTER (decl) = 0;
4570 DECL_REGISTER (decl) = 0;
4571 c_mark_addressable (decl);
4572 C_DECL_REGISTER (decl) = was_reg;
4575 #ifdef ENABLE_CHECKING
4576 /* This is the earliest point at which we might know the assembler
4577 name of a variable. Thus, if it's known before this, die horribly. */
4578 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4582 decl_attributes (&decl, returned_attrs, 0);
4588 /* Decode the parameter-list info for a function type or function definition.
4589 The argument is the value returned by `get_parm_info' (or made in parse.y
4590 if there is an identifier list instead of a parameter decl list).
4591 These two functions are separate because when a function returns
4592 or receives functions then each is called multiple times but the order
4593 of calls is different. The last call to `grokparms' is always the one
4594 that contains the formal parameter names of a function definition.
4596 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4598 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4599 a mere declaration. A nonempty identifier-list gets an error message
4600 when FUNCDEF_FLAG is zero. */
4603 grokparms (tree arg_info, int funcdef_flag)
4605 tree arg_types = ARG_INFO_TYPES (arg_info);
4607 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4608 && !in_system_header)
4609 warning ("function declaration isn't a prototype");
4611 if (arg_types == error_mark_node)
4612 return 0; /* don't set TYPE_ARG_TYPES in this case */
4614 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4617 pedwarn ("parameter names (without types) in function declaration");
4619 ARG_INFO_PARMS (arg_info) = ARG_INFO_TYPES (arg_info);
4620 ARG_INFO_TYPES (arg_info) = 0;
4625 tree parm, type, typelt;
4626 unsigned int parmno;
4628 /* If the arg types are incomplete in a declaration, they must
4629 include undefined tags. These tags can never be defined in
4630 the scope of the declaration, so the types can never be
4631 completed, and no call can be compiled successfully. */
4633 for (parm = ARG_INFO_PARMS (arg_info), typelt = arg_types, parmno = 1;
4635 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4637 type = TREE_VALUE (typelt);
4638 if (type == error_mark_node)
4641 if (!COMPLETE_TYPE_P (type))
4645 if (DECL_NAME (parm))
4646 error ("%Jparameter %u ('%D') has incomplete type",
4647 parm, parmno, parm);
4649 error ("%Jparameter %u has incomplete type",
4652 TREE_VALUE (typelt) = error_mark_node;
4653 TREE_TYPE (parm) = error_mark_node;
4657 if (DECL_NAME (parm))
4658 warning ("%Jparameter %u ('%D') has incomplete type",
4659 parm, parmno, parm);
4661 warning ("%Jparameter %u has incomplete type",
4670 /* Take apart the current scope and return a tree_list node with info
4671 on a parameter list just parsed. This tree_list node should be
4672 examined using the ARG_INFO_* macros, defined above:
4674 ARG_INFO_PARMS: a list of parameter decls.
4675 ARG_INFO_TAGS: a list of structure, union and enum tags defined.
4676 ARG_INFO_TYPES: a list of argument types to go in the FUNCTION_TYPE.
4677 ARG_INFO_OTHERS: a list of non-parameter decls (notably enumeration
4678 constants) defined with the parameters.
4680 This tree_list node is later fed to 'grokparms' and 'store_parm_decls'.
4682 ELLIPSIS being true means the argument list ended in '...' so don't
4683 append a sentinel (void_list_node) to the end of the type-list. */
4686 get_parm_info (bool ellipsis)
4688 struct c_binding *b = current_scope->bindings;
4689 tree arg_info = make_node (TREE_LIST);
4695 static bool explained_incomplete_types = false;
4696 bool gave_void_only_once_err = false;
4698 /* The bindings in this scope must not get put into a block.
4699 We will take care of deleting the binding nodes. */
4700 current_scope->bindings = 0;
4702 /* This function is only called if there was *something* on the
4704 #ifdef ENABLE_CHECKING
4709 /* A parameter list consisting solely of 'void' indicates that the
4710 function takes no arguments. But if the 'void' is qualified
4711 (by 'const' or 'volatile'), or has a storage class specifier
4712 ('register'), then the behavior is undefined; issue an error.
4713 Typedefs for 'void' are OK (see DR#157). */
4714 if (b->prev == 0 /* one binding */
4715 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4716 && !DECL_NAME (b->decl) /* anonymous */
4717 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4719 if (TREE_THIS_VOLATILE (b->decl)
4720 || TREE_READONLY (b->decl)
4721 || C_DECL_REGISTER (b->decl))
4722 error ("'void' as only parameter may not be qualified");
4724 /* There cannot be an ellipsis. */
4726 error ("'void' must be the only parameter");
4728 ARG_INFO_TYPES (arg_info) = void_list_node;
4733 types = void_list_node;
4735 /* Break up the bindings list into parms, tags, types, and others;
4736 apply sanity checks; purge the name-to-decl bindings. */
4739 tree decl = b->decl;
4740 tree type = TREE_TYPE (decl);
4741 const char *keyword;
4743 switch (TREE_CODE (decl))
4748 #ifdef ENABLE_CHECKING
4749 if (I_SYMBOL_BINDING (b->id) != b) abort ();
4751 I_SYMBOL_BINDING (b->id) = b->shadowed;
4754 /* Check for forward decls that never got their actual decl. */
4755 if (TREE_ASM_WRITTEN (decl))
4756 error ("%Jparameter '%D' has just a forward declaration",
4758 /* Check for (..., void, ...) and issue an error. */
4759 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4761 if (!gave_void_only_once_err)
4763 error ("'void' must be the only parameter");
4764 gave_void_only_once_err = true;
4769 /* Valid parameter, add it to the list. */
4770 TREE_CHAIN (decl) = parms;
4773 /* Since there is a prototype, args are passed in their
4774 declared types. The back end may override this later. */
4775 DECL_ARG_TYPE (decl) = type;
4776 types = tree_cons (0, type, types);
4780 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4781 case UNION_TYPE: keyword = "union"; goto tag;
4782 case RECORD_TYPE: keyword = "struct"; goto tag;
4784 /* Types may not have tag-names, in which case the type
4785 appears in the bindings list with b->id NULL. */
4788 #ifdef ENABLE_CHECKING
4789 if (I_TAG_BINDING (b->id) != b) abort ();
4791 I_TAG_BINDING (b->id) = b->shadowed;
4794 /* Warn about any struct, union or enum tags defined in a
4795 parameter list. The scope of such types is limited to
4796 the parameter list, which is rarely if ever desirable
4797 (it's impossible to call such a function with type-
4798 correct arguments). An anonymous union parm type is
4799 meaningful as a GNU extension, so don't warn for that. */
4800 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4803 /* The %s will be one of 'struct', 'union', or 'enum'. */
4804 warning ("'%s %E' declared inside parameter list",
4807 /* The %s will be one of 'struct', 'union', or 'enum'. */
4808 warning ("anonymous %s declared inside parameter list",
4811 if (! explained_incomplete_types)
4813 warning ("its scope is only this definition or declaration,"
4814 " which is probably not what you want");
4815 explained_incomplete_types = true;
4819 tags = tree_cons (b->id, decl, tags);
4824 /* CONST_DECLs appear here when we have an embedded enum,
4825 and TYPE_DECLs appear here when we have an embedded struct
4826 or union. No warnings for this - we already warned about the
4828 TREE_CHAIN (decl) = others;
4833 /* error_mark_node appears here when we have an undeclared
4834 variable. Just throw it away. */
4837 #ifdef ENABLE_CHECKING
4838 if (I_SYMBOL_BINDING (b->id) != b) abort ();
4840 I_SYMBOL_BINDING (b->id) = b->shadowed;
4844 /* Other things that might be encountered. */
4852 b = free_binding_and_advance (b);
4855 ARG_INFO_PARMS (arg_info) = parms;
4856 ARG_INFO_TAGS (arg_info) = tags;
4857 ARG_INFO_TYPES (arg_info) = types;
4858 ARG_INFO_OTHERS (arg_info) = others;
4862 /* Get the struct, enum or union (CODE says which) with tag NAME.
4863 Define the tag as a forward-reference if it is not defined. */
4866 xref_tag (enum tree_code code, tree name)
4868 /* If a cross reference is requested, look up the type
4869 already defined for this tag and return it. */
4871 tree ref = lookup_tag (code, name, 0);
4872 /* If this is the right type of tag, return what we found.
4873 (This reference will be shadowed by shadow_tag later if appropriate.)
4874 If this is the wrong type of tag, do not return it. If it was the
4875 wrong type in the same scope, we will have had an error
4876 message already; if in a different scope and declaring
4877 a name, pending_xref_error will give an error message; but if in a
4878 different scope and not declaring a name, this tag should
4879 shadow the previous declaration of a different type of tag, and
4880 this would not work properly if we return the reference found.
4881 (For example, with "struct foo" in an outer scope, "union foo;"
4882 must shadow that tag with a new one of union type.) */
4883 if (ref && TREE_CODE (ref) == code)
4886 /* If no such tag is yet defined, create a forward-reference node
4887 and record it as the "definition".
4888 When a real declaration of this type is found,
4889 the forward-reference will be altered into a real type. */
4891 ref = make_node (code);
4892 if (code == ENUMERAL_TYPE)
4894 /* Give the type a default layout like unsigned int
4895 to avoid crashing if it does not get defined. */
4896 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4897 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4898 TYPE_USER_ALIGN (ref) = 0;
4899 TYPE_UNSIGNED (ref) = 1;
4900 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4901 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4902 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4905 pushtag (name, ref);
4910 /* Make sure that the tag NAME is defined *in the current scope*
4911 at least as a forward reference.
4912 CODE says which kind of tag NAME ought to be. */
4915 start_struct (enum tree_code code, tree name)
4917 /* If there is already a tag defined at this scope
4918 (as a forward reference), just return it. */
4923 ref = lookup_tag (code, name, 1);
4924 if (ref && TREE_CODE (ref) == code)
4926 if (TYPE_FIELDS (ref))
4928 if (code == UNION_TYPE)
4929 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4931 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4936 /* Otherwise create a forward-reference just so the tag is in scope. */
4938 ref = make_node (code);
4939 pushtag (name, ref);
4942 C_TYPE_BEING_DEFINED (ref) = 1;
4943 TYPE_PACKED (ref) = flag_pack_struct;
4947 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4948 of a structure component, returning a FIELD_DECL node.
4949 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4951 This is done during the parsing of the struct declaration.
4952 The FIELD_DECL nodes are chained together and the lot of them
4953 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4956 grokfield (tree declarator, tree declspecs, tree width)
4960 if (declarator == NULL_TREE && width == NULL_TREE)
4962 /* This is an unnamed decl.
4964 If we have something of the form "union { list } ;" then this
4965 is the anonymous union extension. Similarly for struct.
4967 If this is something of the form "struct foo;", then
4968 If MS extensions are enabled, this is handled as an
4970 Otherwise this is a forward declaration of a structure tag.
4972 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4973 If MS extensions are enabled and foo names a structure, then
4974 again this is an anonymous struct.
4975 Otherwise this is an error.
4977 Oh what a horrid tangled web we weave. I wonder if MS consciously
4978 took this from Plan 9 or if it was an accident of implementation
4979 that took root before someone noticed the bug... */
4981 tree type = TREE_VALUE (declspecs);
4983 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4984 type = TREE_TYPE (type);
4985 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4987 if (flag_ms_extensions)
4990 goto warn_unnamed_field;
4991 else if (TYPE_NAME (type) == NULL)
4994 goto warn_unnamed_field;
4999 warning ("declaration does not declare anything");
5004 value = grokdeclarator (declarator, declspecs, FIELD, 0,
5005 width ? &width : NULL);
5007 finish_decl (value, NULL_TREE, NULL_TREE);
5008 DECL_INITIAL (value) = width;
5013 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5014 the list such that this does not present a problem later. */
5017 detect_field_duplicates (tree fieldlist)
5022 /* First, see if there are more than "a few" fields.
5023 This is trivially true if there are zero or one fields. */
5026 x = TREE_CHAIN (fieldlist);
5032 } while (timeout > 0 && x);
5034 /* If there were "few" fields, avoid the overhead of allocating
5035 a hash table. Instead just do the nested traversal thing. */
5038 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5041 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5042 if (DECL_NAME (y) == DECL_NAME (x))
5044 error ("%Jduplicate member '%D'", x, x);
5045 DECL_NAME (x) = NULL_TREE;
5051 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5054 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5055 if ((y = DECL_NAME (x)) != 0)
5057 slot = htab_find_slot (htab, y, INSERT);
5060 error ("%Jduplicate member '%D'", x, x);
5061 DECL_NAME (x) = NULL_TREE;
5070 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5071 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5072 ATTRIBUTES are attributes to be applied to the structure. */
5075 finish_struct (tree t, tree fieldlist, tree attributes)
5078 bool toplevel = file_scope == current_scope;
5079 int saw_named_field;
5081 /* If this type was previously laid out as a forward reference,
5082 make sure we lay it out again. */
5086 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5090 for (x = fieldlist; x; x = TREE_CHAIN (x))
5091 if (DECL_NAME (x) != 0)
5095 pedwarn ("%s has no %s",
5096 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5097 fieldlist ? _("named members") : _("members"));
5100 /* Install struct as DECL_CONTEXT of each field decl.
5101 Also process specified field sizes,m which is found in the DECL_INITIAL.
5102 Store 0 there, except for ": 0" fields (so we can find them
5103 and delete them, below). */
5105 saw_named_field = 0;
5106 for (x = fieldlist; x; x = TREE_CHAIN (x))
5108 DECL_CONTEXT (x) = t;
5109 DECL_PACKED (x) |= TYPE_PACKED (t);
5111 /* If any field is const, the structure type is pseudo-const. */
5112 if (TREE_READONLY (x))
5113 C_TYPE_FIELDS_READONLY (t) = 1;
5116 /* A field that is pseudo-const makes the structure likewise. */
5117 tree t1 = TREE_TYPE (x);
5118 while (TREE_CODE (t1) == ARRAY_TYPE)
5119 t1 = TREE_TYPE (t1);
5120 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5121 && C_TYPE_FIELDS_READONLY (t1))
5122 C_TYPE_FIELDS_READONLY (t) = 1;
5125 /* Any field that is volatile means variables of this type must be
5126 treated in some ways as volatile. */
5127 if (TREE_THIS_VOLATILE (x))
5128 C_TYPE_FIELDS_VOLATILE (t) = 1;
5130 /* Any field of nominal variable size implies structure is too. */
5131 if (C_DECL_VARIABLE_SIZE (x))
5132 C_TYPE_VARIABLE_SIZE (t) = 1;
5134 /* Detect invalid nested redefinition. */
5135 if (TREE_TYPE (x) == t)
5136 error ("nested redefinition of `%s'",
5137 IDENTIFIER_POINTER (TYPE_NAME (t)));
5139 if (DECL_INITIAL (x))
5141 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5142 DECL_SIZE (x) = bitsize_int (width);
5143 DECL_BIT_FIELD (x) = 1;
5144 SET_DECL_C_BIT_FIELD (x);
5147 DECL_INITIAL (x) = 0;
5149 /* Detect flexible array member in an invalid context. */
5150 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5151 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5152 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5153 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5155 if (TREE_CODE (t) == UNION_TYPE)
5157 error ("%Jflexible array member in union", x);
5158 TREE_TYPE (x) = error_mark_node;
5160 else if (TREE_CHAIN (x) != NULL_TREE)
5162 error ("%Jflexible array member not at end of struct", x);
5163 TREE_TYPE (x) = error_mark_node;
5165 else if (! saw_named_field)
5167 error ("%Jflexible array member in otherwise empty struct", x);
5168 TREE_TYPE (x) = error_mark_node;
5172 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5173 && flexible_array_type_p (TREE_TYPE (x)))
5174 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5177 saw_named_field = 1;
5180 detect_field_duplicates (fieldlist);
5182 /* Now we have the nearly final fieldlist. Record it,
5183 then lay out the structure or union (including the fields). */
5185 TYPE_FIELDS (t) = fieldlist;
5189 /* Delete all zero-width bit-fields from the fieldlist. */
5191 tree *fieldlistp = &fieldlist;
5193 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5194 *fieldlistp = TREE_CHAIN (*fieldlistp);
5196 fieldlistp = &TREE_CHAIN (*fieldlistp);
5199 /* Now we have the truly final field list.
5200 Store it in this type and in the variants. */
5202 TYPE_FIELDS (t) = fieldlist;
5204 /* If there are lots of fields, sort so we can look through them fast.
5205 We arbitrarily consider 16 or more elts to be "a lot". */
5210 for (x = fieldlist; x; x = TREE_CHAIN (x))
5212 if (len > 15 || DECL_NAME (x) == NULL)
5220 struct lang_type *space;
5221 struct sorted_fields_type *space2;
5223 len += list_length (x);
5225 /* Use the same allocation policy here that make_node uses, to
5226 ensure that this lives as long as the rest of the struct decl.
5227 All decls in an inline function need to be saved. */
5229 space = ggc_alloc_cleared (sizeof (struct lang_type));
5230 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5234 field_array = &space2->elts[0];
5235 for (x = fieldlist; x; x = TREE_CHAIN (x))
5237 field_array[len++] = x;
5239 /* If there is anonymous struct or union, break out of the loop. */
5240 if (DECL_NAME (x) == NULL)
5243 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5246 TYPE_LANG_SPECIFIC (t) = space;
5247 TYPE_LANG_SPECIFIC (t)->s->len = len;
5248 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5249 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5254 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5256 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5257 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5258 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5259 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5262 /* If this was supposed to be a transparent union, but we can't
5263 make it one, warn and turn off the flag. */
5264 if (TREE_CODE (t) == UNION_TYPE
5265 && TYPE_TRANSPARENT_UNION (t)
5266 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5268 TYPE_TRANSPARENT_UNION (t) = 0;
5269 warning ("union cannot be made transparent");
5272 /* If this structure or union completes the type of any previous
5273 variable declaration, lay it out and output its rtl. */
5274 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5278 tree decl = TREE_VALUE (x);
5279 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5280 layout_array_type (TREE_TYPE (decl));
5281 if (TREE_CODE (decl) != TYPE_DECL)
5283 layout_decl (decl, 0);
5284 if (c_dialect_objc ())
5285 objc_check_decl (decl);
5286 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5291 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5293 /* Finish debugging output for this type. */
5294 rest_of_type_compilation (t, toplevel);
5299 /* Lay out the type T, and its element type, and so on. */
5302 layout_array_type (tree t)
5304 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5305 layout_array_type (TREE_TYPE (t));
5309 /* Begin compiling the definition of an enumeration type.
5310 NAME is its name (or null if anonymous).
5311 Returns the type object, as yet incomplete.
5312 Also records info about it so that build_enumerator
5313 may be used to declare the individual values as they are read. */
5316 start_enum (tree name)
5320 /* If this is the real definition for a previous forward reference,
5321 fill in the contents in the same object that used to be the
5322 forward reference. */
5325 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5327 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5329 enumtype = make_node (ENUMERAL_TYPE);
5330 pushtag (name, enumtype);
5333 C_TYPE_BEING_DEFINED (enumtype) = 1;
5335 if (TYPE_VALUES (enumtype) != 0)
5337 /* This enum is a named one that has been declared already. */
5338 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5340 /* Completely replace its old definition.
5341 The old enumerators remain defined, however. */
5342 TYPE_VALUES (enumtype) = 0;
5345 enum_next_value = integer_zero_node;
5348 if (flag_short_enums)
5349 TYPE_PACKED (enumtype) = 1;
5354 /* After processing and defining all the values of an enumeration type,
5355 install their decls in the enumeration type and finish it off.
5356 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5357 and ATTRIBUTES are the specified attributes.
5358 Returns ENUMTYPE. */
5361 finish_enum (tree enumtype, tree values, tree attributes)
5364 tree minnode = 0, maxnode = 0;
5365 int precision, unsign;
5366 bool toplevel = (file_scope == current_scope);
5367 struct lang_type *lt;
5369 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5371 /* Calculate the maximum value of any enumerator in this type. */
5373 if (values == error_mark_node)
5374 minnode = maxnode = integer_zero_node;
5377 minnode = maxnode = TREE_VALUE (values);
5378 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5380 tree value = TREE_VALUE (pair);
5381 if (tree_int_cst_lt (maxnode, value))
5383 if (tree_int_cst_lt (value, minnode))
5388 /* Construct the final type of this enumeration. It is the same
5389 as one of the integral types - the narrowest one that fits, except
5390 that normally we only go as narrow as int - and signed iff any of
5391 the values are negative. */
5392 unsign = (tree_int_cst_sgn (minnode) >= 0);
5393 precision = MAX (min_precision (minnode, unsign),
5394 min_precision (maxnode, unsign));
5395 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5397 tem = c_common_type_for_size (precision, unsign);
5400 warning ("enumeration values exceed range of largest integer");
5401 tem = long_long_integer_type_node;
5405 tem = unsign ? unsigned_type_node : integer_type_node;
5407 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5408 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5409 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5410 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5411 TYPE_SIZE (enumtype) = 0;
5412 layout_type (enumtype);
5414 if (values != error_mark_node)
5416 /* Change the type of the enumerators to be the enum type. We
5417 need to do this irrespective of the size of the enum, for
5418 proper type checking. Replace the DECL_INITIALs of the
5419 enumerators, and the value slots of the list, with copies
5420 that have the enum type; they cannot be modified in place
5421 because they may be shared (e.g. integer_zero_node) Finally,
5422 change the purpose slots to point to the names of the decls. */
5423 for (pair = values; pair; pair = TREE_CHAIN (pair))
5425 tree enu = TREE_PURPOSE (pair);
5426 tree ini = DECL_INITIAL (enu);
5428 TREE_TYPE (enu) = enumtype;
5430 /* The ISO C Standard mandates enumerators to have type int,
5431 even though the underlying type of an enum type is
5432 unspecified. Here we convert any enumerators that fit in
5433 an int to type int, to avoid promotions to unsigned types
5434 when comparing integers with enumerators that fit in the
5435 int range. When -pedantic is given, build_enumerator()
5436 would have already taken care of those that don't fit. */
5437 if (int_fits_type_p (ini, integer_type_node))
5438 tem = integer_type_node;
5441 ini = convert (tem, ini);
5443 DECL_INITIAL (enu) = ini;
5444 TREE_PURPOSE (pair) = DECL_NAME (enu);
5445 TREE_VALUE (pair) = ini;
5448 TYPE_VALUES (enumtype) = values;
5451 /* Record the min/max values so that we can warn about bit-field
5452 enumerations that are too small for the values. */
5453 lt = ggc_alloc_cleared (sizeof (struct lang_type));
5454 lt->enum_min = minnode;
5455 lt->enum_max = maxnode;
5456 TYPE_LANG_SPECIFIC (enumtype) = lt;
5458 /* Fix up all variant types of this enum type. */
5459 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5461 if (tem == enumtype)
5463 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5464 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5465 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5466 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5467 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5468 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5469 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5470 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5471 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5472 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5473 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5476 /* Finish debugging output for this type. */
5477 rest_of_type_compilation (enumtype, toplevel);
5482 /* Build and install a CONST_DECL for one value of the
5483 current enumeration type (one that was begun with start_enum).
5484 Return a tree-list containing the CONST_DECL and its value.
5485 Assignment of sequential values by default is handled here. */
5488 build_enumerator (tree name, tree value)
5492 /* Validate and default VALUE. */
5494 /* Remove no-op casts from the value. */
5496 STRIP_TYPE_NOPS (value);
5500 /* Don't issue more errors for error_mark_node (i.e. an
5501 undeclared identifier) - just ignore the value expression. */
5502 if (value == error_mark_node)
5504 else if (TREE_CODE (value) != INTEGER_CST)
5506 error ("enumerator value for '%E' is not an integer constant", name);
5511 value = default_conversion (value);
5512 constant_expression_warning (value);
5516 /* Default based on previous value. */
5517 /* It should no longer be possible to have NON_LVALUE_EXPR
5521 value = enum_next_value;
5523 error ("overflow in enumeration values");
5526 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5528 pedwarn ("ISO C restricts enumerator values to range of `int'");
5529 /* XXX This causes -pedantic to change the meaning of the program.
5530 Remove? -zw 2004-03-15 */
5531 value = convert (integer_type_node, value);
5534 /* Set basis for default for next value. */
5535 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5536 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5538 /* Now create a declaration for the enum value name. */
5540 type = TREE_TYPE (value);
5541 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5542 TYPE_PRECISION (integer_type_node)),
5543 (TYPE_PRECISION (type)
5544 >= TYPE_PRECISION (integer_type_node)
5545 && TYPE_UNSIGNED (type)));
5547 decl = build_decl (CONST_DECL, name, type);
5548 DECL_INITIAL (decl) = convert (type, value);
5551 return tree_cons (decl, value, NULL_TREE);
5555 /* Create the FUNCTION_DECL for a function definition.
5556 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5557 the declaration; they describe the function's name and the type it returns,
5558 but twisted together in a fashion that parallels the syntax of C.
5560 This function creates a binding context for the function body
5561 as well as setting up the FUNCTION_DECL in current_function_decl.
5563 Returns 1 on success. If the DECLARATOR is not suitable for a function
5564 (it defines a datum instead), we return 0, which tells
5565 yyparse to report a parse error. */
5568 start_function (tree declspecs, tree declarator, tree attributes)
5570 tree decl1, old_decl;
5573 current_function_returns_value = 0; /* Assume, until we see it does. */
5574 current_function_returns_null = 0;
5575 current_function_returns_abnormally = 0;
5576 warn_about_return_type = 0;
5577 current_extern_inline = 0;
5578 c_switch_stack = NULL;
5580 /* Indicate no valid break/continue context by setting these variables
5581 to some non-null, non-label value. We'll notice and emit the proper
5582 error message in c_finish_bc_stmt. */
5583 c_break_label = c_cont_label = size_zero_node;
5585 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, NULL);
5587 /* If the declarator is not suitable for a function definition,
5588 cause a syntax error. */
5592 decl_attributes (&decl1, attributes, 0);
5594 if (DECL_DECLARED_INLINE_P (decl1)
5595 && DECL_UNINLINABLE (decl1)
5596 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5597 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5599 announce_function (decl1);
5601 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5603 error ("return type is an incomplete type");
5604 /* Make it return void instead. */
5606 = build_function_type (void_type_node,
5607 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5610 if (warn_about_return_type)
5611 pedwarn_c99 ("return type defaults to `int'");
5613 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5614 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5615 DECL_INITIAL (decl1) = error_mark_node;
5617 /* If this definition isn't a prototype and we had a prototype declaration
5618 before, copy the arg type info from that prototype.
5619 But not if what we had before was a builtin function. */
5620 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5621 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5622 && !DECL_BUILT_IN (old_decl)
5623 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5624 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5625 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5627 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5628 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5631 /* Optionally warn of old-fashioned def with no previous prototype. */
5632 if (warn_strict_prototypes
5633 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5634 && C_DECL_ISNT_PROTOTYPE (old_decl))
5635 warning ("function declaration isn't a prototype");
5636 /* Optionally warn of any global def with no previous prototype. */
5637 else if (warn_missing_prototypes
5638 && TREE_PUBLIC (decl1)
5639 && ! MAIN_NAME_P (DECL_NAME (decl1))
5640 && C_DECL_ISNT_PROTOTYPE (old_decl))
5641 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5642 /* Optionally warn of any def with no previous prototype
5643 if the function has already been used. */
5644 else if (warn_missing_prototypes
5645 && old_decl != 0 && TREE_USED (old_decl)
5646 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5647 warning ("%J'%D' was used with no prototype before its definition",
5649 /* Optionally warn of any global def with no previous declaration. */
5650 else if (warn_missing_declarations
5651 && TREE_PUBLIC (decl1)
5653 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5654 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5655 /* Optionally warn of any def with no previous declaration
5656 if the function has already been used. */
5657 else if (warn_missing_declarations
5658 && old_decl != 0 && TREE_USED (old_decl)
5659 && C_DECL_IMPLICIT (old_decl))
5660 warning ("%J`%D' was used with no declaration before its definition",
5663 /* This is a definition, not a reference.
5664 So normally clear DECL_EXTERNAL.
5665 However, `extern inline' acts like a declaration
5666 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5667 DECL_EXTERNAL (decl1) = current_extern_inline;
5669 /* This function exists in static storage.
5670 (This does not mean `static' in the C sense!) */
5671 TREE_STATIC (decl1) = 1;
5673 /* A nested function is not global. */
5674 if (current_function_decl != 0)
5675 TREE_PUBLIC (decl1) = 0;
5677 #ifdef ENABLE_CHECKING
5678 /* This is the earliest point at which we might know the assembler
5679 name of the function. Thus, if it's set before this, die horribly. */
5680 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5684 /* If #pragma weak was used, mark the decl weak now. */
5685 if (current_scope == file_scope)
5686 maybe_apply_pragma_weak (decl1);
5688 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5689 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5694 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5695 != integer_type_node)
5696 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5698 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5699 args = TREE_CHAIN (args))
5701 tree type = args ? TREE_VALUE (args) : 0;
5703 if (type == void_type_node)
5710 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5711 pedwarn ("%Jfirst argument of '%D' should be `int'",
5716 if (TREE_CODE (type) != POINTER_TYPE
5717 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5718 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5720 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5725 if (TREE_CODE (type) != POINTER_TYPE
5726 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5727 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5729 pedwarn ("%Jthird argument of '%D' should probably be "
5730 "'char **'", decl1, decl1);
5735 /* It is intentional that this message does not mention the third
5736 argument because it's only mentioned in an appendix of the
5738 if (argct > 0 && (argct < 2 || argct > 3))
5739 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5741 if (! TREE_PUBLIC (decl1))
5742 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5745 /* Record the decl so that the function name is defined.
5746 If we already have a decl for this name, and it is a FUNCTION_DECL,
5747 use the old decl. */
5749 current_function_decl = pushdecl (decl1);
5752 declare_parm_level ();
5754 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5755 /* Promote the value to int before returning it. */
5756 if (c_promoting_integer_type_p (restype))
5758 /* It retains unsignedness if not really getting wider. */
5759 if (TYPE_UNSIGNED (restype)
5760 && (TYPE_PRECISION (restype)
5761 == TYPE_PRECISION (integer_type_node)))
5762 restype = unsigned_type_node;
5764 restype = integer_type_node;
5766 DECL_RESULT (current_function_decl)
5767 = build_decl (RESULT_DECL, NULL_TREE, restype);
5769 start_fname_decls ();
5774 /* Subroutine of store_parm_decls which handles new-style function
5775 definitions (prototype format). The parms already have decls, so we
5776 need only record them as in effect and complain if any redundant
5777 old-style parm decls were written. */
5779 store_parm_decls_newstyle (tree fndecl, tree arg_info)
5782 tree parms = ARG_INFO_PARMS (arg_info);
5783 tree tags = ARG_INFO_TAGS (arg_info);
5784 tree others = ARG_INFO_OTHERS (arg_info);
5786 if (current_scope->bindings)
5788 error ("%Jold-style parameter declarations in prototyped "
5789 "function definition", fndecl);
5791 /* Get rid of the old-style declarations. */
5795 /* Don't issue this warning for nested functions, and don't issue this
5796 warning if we got here because ARG_INFO_TYPES was error_mark_node
5797 (this happens when a function definition has just an ellipsis in
5798 its parameter list). */
5799 else if (warn_traditional && !in_system_header && !current_function_scope
5800 && ARG_INFO_TYPES (arg_info) != error_mark_node)
5801 warning ("%Jtraditional C rejects ISO C style function definitions",
5804 /* Now make all the parameter declarations visible in the function body.
5805 We can bypass most of the grunt work of pushdecl. */
5806 for (decl = parms; decl; decl = TREE_CHAIN (decl))
5808 DECL_CONTEXT (decl) = current_function_decl;
5809 if (DECL_NAME (decl))
5810 bind (DECL_NAME (decl), decl, current_scope);
5812 error ("%Jparameter name omitted", decl);
5815 /* Record the parameter list in the function declaration. */
5816 DECL_ARGUMENTS (fndecl) = parms;
5818 /* Now make all the ancillary declarations visible, likewise. */
5819 for (decl = others; decl; decl = TREE_CHAIN (decl))
5821 DECL_CONTEXT (decl) = current_function_decl;
5822 if (DECL_NAME (decl))
5823 bind (DECL_NAME (decl), decl, current_scope);
5826 /* And all the tag declarations. */
5827 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5828 if (TREE_PURPOSE (decl))
5829 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope);
5832 /* Subroutine of store_parm_decls which handles old-style function
5833 definitions (separate parameter list and declarations). */
5836 store_parm_decls_oldstyle (tree fndecl, tree arg_info)
5838 struct c_binding *b;
5839 tree parm, decl, last;
5840 tree parmids = ARG_INFO_PARMS (arg_info);
5842 /* We use DECL_WEAK as a flag to show which parameters have been
5843 seen already, since it is not used on PARM_DECL. */
5844 #ifdef ENABLE_CHECKING
5845 for (b = current_scope->bindings; b; b = b->prev)
5846 if (TREE_CODE (b->decl) == PARM_DECL && DECL_WEAK (b->decl))
5850 if (warn_old_style_definition && !in_system_header)
5851 warning ("%Jold-style function definition", fndecl);
5853 /* Match each formal parameter name with its declaration. Save each
5854 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5855 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5857 if (TREE_VALUE (parm) == 0)
5859 error ("%Jparameter name missing from parameter list", fndecl);
5860 TREE_PURPOSE (parm) = 0;
5864 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
5865 if (b && b->contour == current_scope)
5868 /* If we got something other than a PARM_DECL it is an error. */
5869 if (TREE_CODE (decl) != PARM_DECL)
5870 error ("%J'%D' declared as a non-parameter", decl, decl);
5871 /* If the declaration is already marked, we have a duplicate
5872 name. Complain and ignore the duplicate. */
5873 else if (DECL_WEAK (decl))
5875 error ("%Jmultiple parameters named '%D'", decl, decl);
5876 TREE_PURPOSE (parm) = 0;
5879 /* If the declaration says "void", complain and turn it into
5881 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5883 error ("%Jparameter '%D' declared with void type", decl, decl);
5884 TREE_TYPE (decl) = integer_type_node;
5885 DECL_ARG_TYPE (decl) = integer_type_node;
5886 layout_decl (decl, 0);
5889 /* If no declaration found, default to int. */
5892 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5893 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5894 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5898 pedwarn ("%Jtype of '%D' defaults to 'int'", decl, decl);
5899 else if (extra_warnings)
5900 warning ("%Jtype of '%D' defaults to 'int'", decl, decl);
5903 TREE_PURPOSE (parm) = decl;
5904 DECL_WEAK (decl) = 1;
5907 /* Now examine the parms chain for incomplete declarations
5908 and declarations with no corresponding names. */
5910 for (b = current_scope->bindings; b; b = b->prev)
5913 if (TREE_CODE (parm) != PARM_DECL)
5916 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5918 error ("%Jparameter '%D' has incomplete type", parm, parm);
5919 TREE_TYPE (parm) = error_mark_node;
5922 if (! DECL_WEAK (parm))
5924 error ("%Jdeclaration for parameter '%D' but no such parameter",
5927 /* Pretend the parameter was not missing.
5928 This gets us to a standard state and minimizes
5929 further error messages. */
5930 parmids = chainon (parmids, tree_cons (parm, 0, 0));
5934 /* Chain the declarations together in the order of the list of
5935 names. Store that chain in the function decl, replacing the
5936 list of names. Update the current scope to match. */
5937 DECL_ARGUMENTS (fndecl) = 0;
5939 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5940 if (TREE_PURPOSE (parm))
5942 if (parm && TREE_PURPOSE (parm))
5944 last = TREE_PURPOSE (parm);
5945 DECL_ARGUMENTS (fndecl) = last;
5946 DECL_WEAK (last) = 0;
5948 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
5949 if (TREE_PURPOSE (parm))
5951 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5952 last = TREE_PURPOSE (parm);
5953 DECL_WEAK (last) = 0;
5955 TREE_CHAIN (last) = 0;
5958 /* If there was a previous prototype,
5959 set the DECL_ARG_TYPE of each argument according to
5960 the type previously specified, and report any mismatches. */
5962 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5965 for (parm = DECL_ARGUMENTS (fndecl),
5966 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5967 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5968 != void_type_node));
5969 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5971 if (parm == 0 || type == 0
5972 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5974 error ("number of arguments doesn't match prototype");
5975 error ("%Hprototype declaration",
5976 ¤t_function_prototype_locus);
5979 /* Type for passing arg must be consistent with that
5980 declared for the arg. ISO C says we take the unqualified
5981 type for parameters declared with qualified type. */
5982 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5983 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
5985 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5986 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5988 /* Adjust argument to match prototype. E.g. a previous
5989 `int foo(float);' prototype causes
5990 `int foo(x) float x; {...}' to be treated like
5991 `int foo(float x) {...}'. This is particularly
5992 useful for argument types like uid_t. */
5993 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5995 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
5996 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5997 && TYPE_PRECISION (TREE_TYPE (parm))
5998 < TYPE_PRECISION (integer_type_node))
5999 DECL_ARG_TYPE (parm) = integer_type_node;
6003 pedwarn ("promoted argument '%D' "
6004 "doesn't match prototype", parm);
6005 pedwarn ("%Hprototype declaration",
6006 ¤t_function_prototype_locus);
6011 error ("argument '%D' doesn't match prototype", parm);
6012 error ("%Hprototype declaration",
6013 ¤t_function_prototype_locus);
6017 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6020 /* Otherwise, create a prototype that would match. */
6024 tree actual = 0, last = 0, type;
6026 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6028 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6030 TREE_CHAIN (last) = type;
6035 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6037 TREE_CHAIN (last) = type;
6041 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6042 of the type of this function, but we need to avoid having this
6043 affect the types of other similarly-typed functions, so we must
6044 first force the generation of an identical (but separate) type
6045 node for the relevant function type. The new node we create
6046 will be a variant of the main variant of the original function
6049 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6051 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6055 /* Store the parameter declarations into the current function declaration.
6056 This is called after parsing the parameter declarations, before
6057 digesting the body of the function.
6059 For an old-style definition, construct a prototype out of the old-style
6060 parameter declarations and inject it into the function's type. */
6063 store_parm_decls (void)
6065 tree fndecl = current_function_decl;
6067 /* The argument information block for FNDECL. */
6068 tree arg_info = DECL_ARGUMENTS (fndecl);
6070 /* True if this definition is written with a prototype. Note:
6071 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6072 list in a function definition as equivalent to (void) -- an
6073 empty argument list specifies the function has no parameters,
6074 but only (void) sets up a prototype for future calls. */
6075 bool proto = ARG_INFO_TYPES (arg_info) != 0;
6078 store_parm_decls_newstyle (fndecl, arg_info);
6080 store_parm_decls_oldstyle (fndecl, arg_info);
6082 /* The next call to push_scope will be a function body. */
6084 next_is_function_body = true;
6086 /* Write a record describing this function definition to the prototypes
6087 file (if requested). */
6089 gen_aux_info_record (fndecl, 1, 0, proto);
6091 /* Initialize the RTL code for the function. */
6092 allocate_struct_function (fndecl);
6094 /* Begin the statement tree for this function. */
6095 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6097 /* ??? Insert the contents of the pending sizes list into the function
6098 to be evaluated. This just changes mis-behaviour until assign_parms
6099 phase ordering problems are resolved. */
6102 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6103 add_stmt (TREE_VALUE (t));
6106 /* Even though we're inside a function body, we still don't want to
6107 call expand_expr to calculate the size of a variable-sized array.
6108 We haven't necessarily assigned RTL to all variables yet, so it's
6109 not safe to try to expand expressions involving them. */
6110 cfun->x_dont_save_pending_sizes_p = 1;
6113 /* Give FNDECL and all its nested functions to cgraph for compilation. */
6116 c_finalize (tree fndecl)
6118 struct cgraph_node *cgn;
6120 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6121 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6123 /* ??? Objc emits functions after finalizing the compilation unit.
6124 This should be cleaned up later and this conditional removed. */
6125 if (cgraph_global_info_ready)
6127 c_expand_body (fndecl);
6131 /* Finalize all nested functions now. */
6132 cgn = cgraph_node (fndecl);
6133 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6134 c_finalize (cgn->decl);
6136 cgraph_finalize_function (fndecl, false);
6139 /* Finish up a function declaration and compile that function
6140 all the way to assembler language output. The free the storage
6141 for the function definition.
6143 This is called after parsing the body of the function definition. */
6146 finish_function (void)
6148 tree fndecl = current_function_decl;
6150 if (TREE_CODE (fndecl) == FUNCTION_DECL
6151 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6153 tree args = DECL_ARGUMENTS (fndecl);
6154 for (; args; args = TREE_CHAIN (args))
6156 tree type = TREE_TYPE (args);
6157 if (INTEGRAL_TYPE_P (type)
6158 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6159 DECL_ARG_TYPE (args) = integer_type_node;
6163 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6164 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6166 /* Must mark the RESULT_DECL as being in this function. */
6168 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6169 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6171 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6173 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6174 != integer_type_node)
6176 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6177 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6179 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6184 c_finish_return (integer_zero_node);
6188 /* Tie off the statement tree for this function. */
6189 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6191 finish_fname_decls ();
6193 /* Complain if there's just no return statement. */
6194 if (warn_return_type
6195 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6196 && !current_function_returns_value && !current_function_returns_null
6197 /* Don't complain if we abort. */
6198 && !current_function_returns_abnormally
6199 /* Don't warn for main(). */
6200 && !MAIN_NAME_P (DECL_NAME (fndecl))
6201 /* Or if they didn't actually specify a return type. */
6202 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6203 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6204 inline function, as we might never be compiled separately. */
6205 && DECL_INLINE (fndecl))
6206 warning ("no return statement in function returning non-void");
6208 /* With just -Wextra, complain only if function returns both with
6209 and without a value. */
6211 && current_function_returns_value
6212 && current_function_returns_null)
6213 warning ("this function may return with or without a value");
6215 /* Store the end of the function, so that we get good line number
6216 info for the epilogue. */
6217 cfun->function_end_locus = input_location;
6219 /* If we don't have ctors/dtors sections, and this is a static
6220 constructor or destructor, it must be recorded now. */
6221 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6222 && !targetm.have_ctors_dtors)
6223 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6224 if (DECL_STATIC_DESTRUCTOR (fndecl)
6225 && !targetm.have_ctors_dtors)
6226 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6228 /* Genericize before inlining. Delay genericizing nested functions
6229 until their parent function is genericized. Since finalizing
6230 requires GENERIC, delay that as well. */
6232 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6234 if (!decl_function_context (fndecl))
6236 c_genericize (fndecl);
6237 lower_nested_functions (fndecl);
6238 c_finalize (fndecl);
6242 /* Register this function with cgraph just far enough to get it
6243 added to our parent's nested function list. Handy, since the
6244 C front end doesn't have such a list. */
6245 (void) cgraph_node (fndecl);
6249 /* We're leaving the context of this function, so zap cfun.
6250 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6251 tree_rest_of_compilation. */
6253 current_function_decl = NULL;
6256 /* Generate the RTL for the body of FNDECL. */
6259 c_expand_body (tree fndecl)
6262 if (!DECL_INITIAL (fndecl)
6263 || DECL_INITIAL (fndecl) == error_mark_node)
6266 tree_rest_of_compilation (fndecl, false);
6268 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6269 && targetm.have_ctors_dtors)
6270 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6271 DEFAULT_INIT_PRIORITY);
6272 if (DECL_STATIC_DESTRUCTOR (fndecl)
6273 && targetm.have_ctors_dtors)
6274 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6275 DEFAULT_INIT_PRIORITY);
6278 /* Check the declarations given in a for-loop for satisfying the C99
6281 check_for_loop_decls (void)
6283 struct c_binding *b;
6287 /* If we get here, declarations have been used in a for loop without
6288 the C99 for loop scope. This doesn't make much sense, so don't
6290 error ("'for' loop initial declaration used outside C99 mode");
6293 /* C99 subclause 6.8.5 paragraph 3:
6295 [#3] The declaration part of a for statement shall only
6296 declare identifiers for objects having storage class auto or
6299 It isn't clear whether, in this sentence, "identifiers" binds to
6300 "shall only declare" or to "objects" - that is, whether all identifiers
6301 declared must be identifiers for objects, or whether the restriction
6302 only applies to those that are. (A question on this in comp.std.c
6303 in November 2000 received no answer.) We implement the strictest
6304 interpretation, to avoid creating an extension which later causes
6307 for (b = current_scope->bindings; b; b = b->prev)
6310 tree decl = b->decl;
6315 switch (TREE_CODE (decl))
6318 if (TREE_STATIC (decl))
6319 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6320 "initial declaration", decl, decl);
6321 else if (DECL_EXTERNAL (decl))
6322 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6323 "initial declaration", decl, decl);
6327 error ("'struct %E' declared in 'for' loop initial declaration", id);
6330 error ("'union %E' declared in 'for' loop initial declaration", id);
6333 error ("'enum %E' declared in 'for' loop initial declaration", id);
6336 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6337 "initial declaration", decl, decl);
6342 /* Save and reinitialize the variables
6343 used during compilation of a C function. */
6346 c_push_function_context (struct function *f)
6348 struct language_function *p;
6349 p = ggc_alloc (sizeof (struct language_function));
6352 p->base.x_stmt_tree = c_stmt_tree;
6353 p->x_break_label = c_break_label;
6354 p->x_cont_label = c_cont_label;
6355 p->x_switch_stack = c_switch_stack;
6356 p->returns_value = current_function_returns_value;
6357 p->returns_null = current_function_returns_null;
6358 p->returns_abnormally = current_function_returns_abnormally;
6359 p->warn_about_return_type = warn_about_return_type;
6360 p->extern_inline = current_extern_inline;
6363 /* Restore the variables used during compilation of a C function. */
6366 c_pop_function_context (struct function *f)
6368 struct language_function *p = f->language;
6370 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6371 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6373 /* Stop pointing to the local nodes about to be freed. */
6374 /* But DECL_INITIAL must remain nonzero so we know this
6375 was an actual function definition. */
6376 DECL_INITIAL (current_function_decl) = error_mark_node;
6377 DECL_ARGUMENTS (current_function_decl) = 0;
6380 c_stmt_tree = p->base.x_stmt_tree;
6381 c_break_label = p->x_break_label;
6382 c_cont_label = p->x_cont_label;
6383 c_switch_stack = p->x_switch_stack;
6384 current_function_returns_value = p->returns_value;
6385 current_function_returns_null = p->returns_null;
6386 current_function_returns_abnormally = p->returns_abnormally;
6387 warn_about_return_type = p->warn_about_return_type;
6388 current_extern_inline = p->extern_inline;
6393 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6396 c_dup_lang_specific_decl (tree decl)
6398 struct lang_decl *ld;
6400 if (!DECL_LANG_SPECIFIC (decl))
6403 ld = ggc_alloc (sizeof (struct lang_decl));
6404 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6405 DECL_LANG_SPECIFIC (decl) = ld;
6408 /* The functions below are required for functionality of doing
6409 function at once processing in the C front end. Currently these
6410 functions are not called from anywhere in the C front end, but as
6411 these changes continue, that will change. */
6413 /* Returns nonzero if the current statement is a full expression,
6414 i.e. temporaries created during that statement should be destroyed
6415 at the end of the statement. */
6418 stmts_are_full_exprs_p (void)
6423 /* Returns the stmt_tree (if any) to which statements are currently
6424 being added. If there is no active statement-tree, NULL is
6428 current_stmt_tree (void)
6430 return &c_stmt_tree;
6433 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6437 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6442 /* Dummy function in place of callback used by C++. */
6445 extract_interface_info (void)
6449 /* Return the global value of T as a symbol. */
6452 identifier_global_value (tree t)
6454 struct c_binding *b;
6456 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6457 if (b->contour == file_scope || b->contour == external_scope)
6463 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6464 otherwise the name is found in ridpointers from RID_INDEX. */
6467 record_builtin_type (enum rid rid_index, const char *name, tree type)
6471 id = ridpointers[(int) rid_index];
6473 id = get_identifier (name);
6474 pushdecl (build_decl (TYPE_DECL, id, type));
6477 /* Build the void_list_node (void_type_node having been created). */
6479 build_void_list_node (void)
6481 tree t = build_tree_list (NULL_TREE, void_type_node);
6485 /* Return something to represent absolute declarators containing a *.
6486 TARGET is the absolute declarator that the * contains.
6487 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6488 to apply to the pointer type, represented as identifiers, possible mixed
6491 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6492 if attributes are present) and whose type is the modifier list. */
6495 make_pointer_declarator (tree type_quals_attrs, tree target)
6498 tree itarget = target;
6499 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6500 if (attrs != NULL_TREE)
6501 itarget = tree_cons (attrs, target, NULL_TREE);
6502 return build1 (INDIRECT_REF, quals, itarget);
6505 /* A wrapper around lhd_set_decl_assembler_name that gives static
6506 variables their C names if they are at file scope and only one
6507 translation unit is being compiled, for backwards compatibility
6508 with certain bizarre assembler hacks (like crtstuff.c). */
6511 c_static_assembler_name (tree decl)
6513 if (num_in_fnames == 1
6514 && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6515 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6516 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6518 lhd_set_decl_assembler_name (decl);
6521 /* Perform final processing on file-scope data. */
6523 c_write_global_declarations_1 (tree globals)
6525 size_t len = list_length (globals);
6526 tree *vec = xmalloc (sizeof (tree) * len);
6530 /* Process the decls in the order they were written. */
6531 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6534 wrapup_global_declarations (vec, len);
6535 check_global_declarations (vec, len);
6541 c_write_global_declarations (void)
6545 /* We don't want to do this if generating a PCH. */
6549 /* Process all file scopes in this compilation. */
6550 for (t = all_translation_units; t; t = TREE_CHAIN (t))
6551 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
6553 /* Now do the same for the externals scope. */
6556 c_write_global_declarations_1 (BLOCK_VARS (t));
6559 #include "gt-c-decl.h"