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 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"
56 #include "langhooks-def.h"
58 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
60 { NORMAL, /* Ordinary declaration */
61 FUNCDEF, /* Function definition */
62 PARM, /* Declaration of parm before function body */
63 FIELD, /* Declaration inside struct or union */
64 BITFIELD, /* Likewise but with specified width */
65 TYPENAME}; /* Typename (inside cast or sizeof) */
68 /* Nonzero if we have seen an invalid cross reference
69 to a struct, union, or enum, but not yet printed the message. */
71 tree pending_invalid_xref;
72 /* File and line to appear in the eventual error message. */
73 location_t pending_invalid_xref_location;
75 /* While defining an enum type, this is 1 plus the last enumerator
76 constant value. Note that will do not have to save this or `enum_overflow'
77 around nested function definition since such a definition could only
78 occur in an enum value expression and we don't use these variables in
81 static tree enum_next_value;
83 /* Nonzero means that there was overflow computing enum_next_value. */
85 static int enum_overflow;
87 /* Parsing a function declarator leaves a list of parameter names
88 or a chain of parameter decls here. */
90 static tree last_function_parms;
92 /* ... and a chain of structure and enum types declared in the
95 static tree last_function_parm_tags;
97 /* ... and a chain of all non-parameter declarations (such as
98 CONST_DECLs from enumerations) here. */
100 static tree last_function_parm_others;
102 /* After parsing the declarator that starts a function definition,
103 `start_function' puts the list of parameter names or chain of decls here
104 for `store_parm_decls' to find. */
106 static tree current_function_parms;
108 /* Similar, for last_function_parm_tags. */
110 static tree current_function_parm_tags;
112 /* And for last_function_parm_others. */
114 static tree current_function_parm_others;
116 /* Similar, for the file and line that the prototype came from if this is
117 an old-style definition. */
119 static location_t current_function_prototype_locus;
121 /* The current statement tree. */
123 static GTY(()) struct stmt_tree_s c_stmt_tree;
125 /* The current scope statement stack. */
127 static GTY(()) tree c_scope_stmt_stack;
129 /* A list of external DECLs that appeared at block scope when there was
130 some other global meaning for that identifier. */
131 static GTY(()) tree truly_local_externals;
133 /* All the builtins; this is a subset of the entries of global_scope. */
135 static GTY(()) tree first_builtin_decl;
136 static GTY(()) tree last_builtin_decl;
138 /* A DECL for the current file-scope context. */
140 static GTY(()) tree current_file_decl;
142 /* Set to 0 at beginning of a function definition, set to 1 if
143 a return statement that specifies a return value is seen. */
145 int current_function_returns_value;
147 /* Set to 0 at beginning of a function definition, set to 1 if
148 a return statement with no argument is seen. */
150 int current_function_returns_null;
152 /* Set to 0 at beginning of a function definition, set to 1 if
153 a call to a noreturn function is seen. */
155 int current_function_returns_abnormally;
157 /* Set to nonzero by `grokdeclarator' for a function
158 whose return type is defaulted, if warnings for this are desired. */
160 static int warn_about_return_type;
162 /* Nonzero when starting a function declared `extern inline'. */
164 static int current_extern_inline;
166 /* Each c_scope structure describes the complete contents of one scope.
167 Three scopes are distinguished specially: the innermost or current
168 scope, the innermost function scope, and the outermost or file scope.
170 Most declarations are recorded in the current scope.
172 All normal label declarations are recorded in the innermost
173 function scope, as are bindings of undeclared identifiers to
174 error_mark_node. (GCC permits nested functions as an extension,
175 hence the 'innermost' qualifier.) Explicitly declared labels
176 (using the __label__ extension) appear in the current scope.
178 Being in the global scope (current_scope == global_scope) causes
179 special behavior in several places below. Also, under some
180 conditions the Objective-C front end records declarations in the
181 global scope even though that isn't the current scope.
183 The order of the names, parms, and blocks lists matters, and they
184 are frequently appended to. To avoid having to walk all the way to
185 the end of the list on each insertion, or reverse the lists later,
186 we maintain a pointer to the last list entry for each of the lists.
188 The order of the tags, shadowed, and shadowed_tags
189 lists does not matter, so we just prepend to these lists. */
191 struct c_scope GTY(())
193 /* The scope containing this one. */
194 struct c_scope *outer;
196 /* The next outermost function scope. */
197 struct c_scope *outer_function;
199 /* All variables, constants, functions, labels, and typedef names. */
203 /* All parameter declarations. Used only in the outermost scope of
208 /* All structure, union, and enum type tags. */
211 /* For each scope, a list of shadowed outer-scope definitions
212 to be restored when this scope is popped.
213 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
214 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
217 /* For each scope, a list of shadowed outer-scope tag definitions
218 to be restored when this scope is popped.
219 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
220 whose TREE_VALUE is its old definition (a kind of ..._TYPE node). */
223 /* For each scope (except the global one), a chain of BLOCK nodes
224 for all the scopes that were entered and exited one level down. */
228 /* True if we are currently filling this scope with parameter
232 /* True if we already complained about forward parameter decls
233 in this scope. This prevents double warnings on
234 foo (int a; int b; ...) */
235 bool warned_forward_parm_decls : 1;
237 /* True if this is the outermost block scope of a function body.
238 This scope contains the parameters, the local variables declared
239 in the outermost block, and all the labels (except those in
240 nested functions, or declared at block scope with __label__). */
241 bool function_body : 1;
243 /* True means make a BLOCK for this scope no matter what. */
247 /* The scope currently in effect. */
249 static GTY(()) struct c_scope *current_scope;
251 /* A chain of c_scope structures awaiting reuse. */
253 static GTY((deletable (""))) struct c_scope *scope_freelist;
255 /* The innermost function scope. Ordinary (not explicitly declared)
256 labels, bindings to error_mark_node, and the lazily-created
257 bindings of __func__ and its friends get this scope. */
259 static GTY(()) struct c_scope *current_function_scope;
261 /* The outermost scope, corresponding to the C "file scope". This is
262 created when the compiler is started and exists through the entire run. */
264 static GTY(()) struct c_scope *global_scope;
266 /* Append VAR to LIST in scope SCOPE. */
267 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
268 struct c_scope *s_ = (scope); \
270 if (s_->list##_last) \
271 TREE_CHAIN (s_->list##_last) = d_; \
274 s_->list##_last = d_; \
277 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
278 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
279 struct c_scope *t_ = (tscope); \
280 struct c_scope *f_ = (fscope); \
282 TREE_CHAIN (t_->to##_last) = f_->from; \
285 t_->to##_last = f_->from##_last; \
288 /* True means unconditionally make a BLOCK for the next scope pushed. */
290 static bool keep_next_level_flag;
292 /* True means the next call to pushlevel will be the outermost scope
293 of a function body, so do not push a new scope, merely cease
294 expecting parameter decls. */
296 static bool next_is_function_body;
298 /* Functions called automatically at the beginning and end of execution. */
300 tree static_ctors, static_dtors;
302 /* Forward declarations. */
304 static struct c_scope *make_scope (void);
305 static void pop_scope (void);
306 static tree match_builtin_function_types (tree, tree);
307 static int duplicate_decls (tree, tree, int, int);
308 static int redeclaration_error_message (tree, tree);
309 static tree make_label (tree, location_t);
310 static void bind_label (tree, tree, struct c_scope *);
311 static void implicit_decl_warning (tree);
312 static tree lookup_tag (enum tree_code, tree, int);
313 static tree lookup_name_current_level (tree);
314 static tree grokdeclarator (tree, tree, enum decl_context, int);
315 static tree grokparms (tree, int);
316 static void layout_array_type (tree);
317 static void store_parm_decls_newstyle (void);
318 static void store_parm_decls_oldstyle (void);
319 static tree c_make_fname_decl (tree, int);
320 static void c_expand_body_1 (tree, int);
321 static tree any_external_decl (tree);
322 static void record_external_decl (tree);
323 static void warn_if_shadowing (tree, tree);
324 static void clone_underlying_type (tree);
325 static bool flexible_array_type_p (tree);
326 static hashval_t link_hash_hash (const void *);
327 static int link_hash_eq (const void *, const void *);
329 /* States indicating how grokdeclarator() should handle declspecs marked
330 with __attribute__((deprecated)). An object declared as
331 __attribute__((deprecated)) suppresses warnings of uses of other
334 enum deprecated_states {
339 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
342 c_print_identifier (FILE *file, tree node, int indent)
344 print_node (file, "symbol", IDENTIFIER_SYMBOL_VALUE (node), indent + 4);
345 print_node (file, "tag", IDENTIFIER_TAG_VALUE (node), indent + 4);
346 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
347 if (C_IS_RESERVED_WORD (node))
349 tree rid = ridpointers[C_RID_CODE (node)];
350 indent_to (file, indent + 4);
351 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
352 (void *) rid, IDENTIFIER_POINTER (rid));
356 /* Hook called at end of compilation to assume 1 elt
357 for a file-scope tentative array defn that wasn't complete before. */
360 c_finish_incomplete_decl (tree decl)
362 if (TREE_CODE (decl) == VAR_DECL)
364 tree type = TREE_TYPE (decl);
365 if (type != error_mark_node
366 && TREE_CODE (type) == ARRAY_TYPE
367 && ! DECL_EXTERNAL (decl)
368 && TYPE_DOMAIN (type) == 0)
370 warning ("%Jarray '%D' assumed to have one element", decl, decl);
372 complete_array_type (type, NULL_TREE, 1);
374 layout_decl (decl, 0);
379 /* Reuse or create a struct for this scope. */
381 static struct c_scope *
384 struct c_scope *result;
387 result = scope_freelist;
388 scope_freelist = result->outer;
391 result = ggc_alloc_cleared (sizeof (struct c_scope));
396 /* Remove the topmost scope from the stack and add it to the
397 free list, updating current_function_scope if necessary. */
402 struct c_scope *scope = current_scope;
404 current_scope = scope->outer;
405 if (scope->function_body)
406 current_function_scope = scope->outer_function;
408 memset (scope, 0, sizeof (struct c_scope));
409 scope->outer = scope_freelist;
410 scope_freelist = scope;
413 /* Nonzero if we are currently in the global scope. */
416 global_bindings_p (void)
418 return current_scope == global_scope;
422 keep_next_level (void)
424 keep_next_level_flag = true;
427 /* Identify this scope as currently being filled with parameters. */
430 declare_parm_level (void)
432 current_scope->parm_flag = true;
435 /* Nonzero if currently making parm declarations. */
438 in_parm_level_p (void)
440 return current_scope->parm_flag;
443 /* Enter a new scope. The dummy parameter is for signature
444 compatibility with lang_hooks.decls.pushlevel. */
447 pushlevel (int dummy ATTRIBUTE_UNUSED)
449 if (next_is_function_body)
451 /* This is the transition from the parameters to the top level
452 of the function body. These are the same scope
453 (C99 6.2.1p4,6) so we do not push another scope structure.
454 next_is_function_body is set only by store_parm_decls, which
455 in turn is called when and only when we are about to
456 encounter the opening curly brace for the function body.
458 The outermost block of a function always gets a BLOCK node,
459 because the debugging output routines expect that each
460 function has at least one BLOCK. */
461 current_scope->parm_flag = false;
462 current_scope->function_body = true;
463 current_scope->keep = true;
464 current_scope->outer_function = current_function_scope;
465 current_function_scope = current_scope;
467 keep_next_level_flag = false;
468 next_is_function_body = false;
472 struct c_scope *scope = make_scope ();
474 scope->keep = keep_next_level_flag;
475 scope->outer = current_scope;
476 current_scope = scope;
477 keep_next_level_flag = false;
481 /* Exit a scope. Restore the state of the identifier-decl mappings
482 that were in effect when this scope was entered.
484 If KEEP is KEEP_YES (1), this scope had explicit declarations, so
485 create a BLOCK node to record its declarations and subblocks for
486 debugging output. If KEEP is KEEP_MAYBE, do so only if the names
487 or tags lists are nonempty.
489 The second parameter is ignored; it is present only for
490 signature compatibility with lang_hooks.decls.poplevel.
492 If FUNCTIONBODY is nonzero, this level is the body of a function,
493 even if current_scope->function_body is not set. This is used
494 by language-independent code that generates synthetic functions,
495 and cannot set current_scope->function_body.
497 FIXME: Eliminate the need for all arguments. */
500 poplevel (int keep, int dummy ATTRIBUTE_UNUSED, int functionbody)
502 struct c_scope *scope = current_scope;
507 /* The following line does not use |= due to a bug in HP's C compiler */
508 scope->function_body = scope->function_body | functionbody;
510 if (keep == KEEP_MAYBE)
511 keep = (scope->names || scope->tags);
514 keep |= scope->function_body;
516 /* If appropriate, create a BLOCK to record the decls for the life
521 block = make_node (BLOCK);
522 BLOCK_VARS (block) = scope->names;
523 BLOCK_SUBBLOCKS (block) = scope->blocks;
524 TREE_USED (block) = 1;
527 /* In each subblock, record that this is its superior. */
528 for (p = scope->blocks; p; p = TREE_CHAIN (p))
529 BLOCK_SUPERCONTEXT (p) = block;
531 /* Clear out the variable bindings in this scope.
533 Propagate TREE_ADDRESSABLE from nested functions to their
534 containing functions.
536 Issue warnings for unused variables and labels, and errors for
537 undefined labels, if there are any. */
539 for (p = scope->names; p; p = TREE_CHAIN (p))
541 switch (TREE_CODE (p))
544 if (TREE_USED (p) && !DECL_INITIAL (p))
546 error ("%Jlabel `%D' used but not defined", p, p);
547 DECL_INITIAL (p) = error_mark_node;
549 else if (!TREE_USED (p) && warn_unused_label)
551 if (DECL_INITIAL (p))
552 warning ("%Jlabel `%D' defined but not used", p, p);
554 warning ("%Jlabel `%D' declared but not defined", p, p);
557 IDENTIFIER_LABEL_VALUE (DECL_NAME (p)) = 0;
561 if (! TREE_ASM_WRITTEN (p)
562 && DECL_INITIAL (p) != 0
563 && TREE_ADDRESSABLE (p)
564 && DECL_ABSTRACT_ORIGIN (p) != 0
565 && DECL_ABSTRACT_ORIGIN (p) != p)
566 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
570 /* Keep this in sync with stmt.c:warn_about_unused_variables.
571 No warnings when the global scope is popped because the
572 global scope isn't popped for the last translation unit,
573 so the warnings are done in c_write_global_declaration. */
574 if (warn_unused_variable && scope != global_scope
576 && !DECL_IN_SYSTEM_HEADER (p)
578 && !DECL_ARTIFICIAL (p))
579 warning ("%Junused variable `%D'", p, p);
586 if (DECL_EXTERNAL (p) && scope != global_scope)
587 /* External decls stay in the symbol-value slot but are
589 C_DECL_INVISIBLE (p) = 1;
591 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p)) = 0;
597 /* Clear out the parameter bindings in this scope, if any.
598 Unused-parameter warnings are handled by function.c. */
599 for (p = scope->parms; p; p = TREE_CHAIN (p))
601 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p)) = 0;
603 /* Clear out the tag-meanings declared in this scope.
605 Set the TYPE_CONTEXTs for all of the tagged types belonging to
606 this scope so that they point to the appropriate construct, i.e.
607 either to the current FUNCTION_DECL node, or else to the BLOCK
608 node we just constructed.
610 Note that for tagged types whose scope is just the formal
611 parameter list for some function type specification, we can't
612 properly set their TYPE_CONTEXTs here, because we don't have a
613 pointer to the appropriate FUNCTION_TYPE node readily available
614 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
615 type nodes get set in `grokdeclarator' as soon as we have created
616 the FUNCTION_TYPE node which will represent the "scope" for these
617 "parameter list local" tagged types. */
619 decl = scope->function_body ? current_function_decl : block;
620 for (p = scope->tags; p; p = TREE_CHAIN (p))
622 if (TREE_PURPOSE (p))
623 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p)) = 0;
625 TYPE_CONTEXT (TREE_VALUE (p)) = decl;
628 /* Restore all name- and label-meanings from outer scopes that were
629 shadowed by this scope. */
630 for (p = scope->shadowed; p; p = TREE_CHAIN (p))
631 if (TREE_VALUE (p) && TREE_CODE (TREE_VALUE (p)) == LABEL_DECL)
632 IDENTIFIER_LABEL_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
634 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
636 /* Restore all tag-meanings from outer scopes that were shadowed by
638 for (p = scope->shadowed_tags; p; p = TREE_CHAIN (p))
639 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
641 /* Dispose of the block that we just made inside some higher level. */
642 if (scope->function_body)
643 DECL_INITIAL (current_function_decl) = block;
644 else if (scope->outer)
647 SCOPE_LIST_APPEND (scope->outer, blocks, block);
648 /* If we did not make a block for the scope just exited, any
649 blocks made for inner scopes must be carried forward so they
650 will later become subblocks of something else. */
651 else if (scope->blocks)
652 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
655 /* Pop the current scope, and free the structure for reuse. */
661 /* Insert BLOCK at the end of the list of subblocks of the current
662 scope. This is used when a BIND_EXPR is expanded, to handle the
663 BLOCK node inside the BIND_EXPR. */
666 insert_block (tree block)
668 TREE_USED (block) = 1;
669 SCOPE_LIST_APPEND (current_scope, blocks, block);
672 /* Set the BLOCK node for the innermost scope (the one we are
673 currently in). The RTL expansion machinery requires us to provide
674 this hook, but it is not useful in function-at-a-time mode. */
677 set_block (tree block ATTRIBUTE_UNUSED)
681 /* Push a definition or a declaration of struct, union or enum tag "name".
682 "type" should be the type node.
683 We assume that the tag "name" is not already defined.
685 Note that the definition may really be just a forward reference.
686 In that case, the TYPE_SIZE will be zero. */
689 pushtag (tree name, tree type)
691 struct c_scope *b = current_scope;
693 /* Record the identifier as the type's name if it has none. */
696 if (TYPE_NAME (type) == 0)
697 TYPE_NAME (type) = name;
699 if (IDENTIFIER_TAG_VALUE (name))
700 b->shadowed_tags = tree_cons (name, IDENTIFIER_TAG_VALUE (name),
702 IDENTIFIER_TAG_VALUE (name) = type;
705 b->tags = tree_cons (name, type, b->tags);
707 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
708 tagged type we just added to the current scope. This fake
709 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
710 to output a representation of a tagged type, and it also gives
711 us a convenient place to record the "scope start" address for the
714 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
716 /* An approximation for now, so we can tell this is a function-scope tag.
717 This will be updated in poplevel. */
718 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
721 /* Subroutine of duplicate_decls. Allow harmless mismatches in return
722 and argument types provided that the type modes match. This function
723 return a unified type given a suitable match, and 0 otherwise. */
726 match_builtin_function_types (tree oldtype, tree newtype)
728 tree newrettype, oldrettype;
729 tree newargs, oldargs;
730 tree trytype, tryargs;
732 /* Accept the return type of the new declaration if same modes. */
733 oldrettype = TREE_TYPE (oldtype);
734 newrettype = TREE_TYPE (newtype);
736 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
739 oldargs = TYPE_ARG_TYPES (oldtype);
740 newargs = TYPE_ARG_TYPES (newtype);
743 while (oldargs || newargs)
747 || ! TREE_VALUE (oldargs)
748 || ! TREE_VALUE (newargs)
749 || TYPE_MODE (TREE_VALUE (oldargs))
750 != TYPE_MODE (TREE_VALUE (newargs)))
753 oldargs = TREE_CHAIN (oldargs);
754 newargs = TREE_CHAIN (newargs);
757 trytype = build_function_type (newrettype, tryargs);
758 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
761 /* Handle when a new declaration NEWDECL
762 has the same name as an old one OLDDECL
763 in the same binding contour.
764 Prints an error message if appropriate.
766 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
769 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
770 and OLDDECL is in an outer scope and should thus not be changed. */
773 duplicate_decls (tree newdecl, tree olddecl, int different_binding_level,
776 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl),
778 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
779 && DECL_INITIAL (newdecl) != 0);
780 tree oldtype = TREE_TYPE (olddecl);
781 tree newtype = TREE_TYPE (newdecl);
784 if (DECL_P (olddecl))
786 if (TREE_CODE (newdecl) == FUNCTION_DECL
787 && TREE_CODE (olddecl) == FUNCTION_DECL
788 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
790 if (DECL_DECLARED_INLINE_P (newdecl)
791 && DECL_UNINLINABLE (newdecl)
792 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
793 /* Already warned elsewhere. */;
794 else if (DECL_DECLARED_INLINE_P (olddecl)
795 && DECL_UNINLINABLE (olddecl)
796 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
797 /* Already warned. */;
798 else if (DECL_DECLARED_INLINE_P (newdecl)
799 && ! DECL_DECLARED_INLINE_P (olddecl)
800 && DECL_UNINLINABLE (olddecl)
801 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
803 warning ("%Jfunction '%D' redeclared as inline",
805 warning ("%Jprevious declaration of function '%D' "
806 "with attribute noinline", olddecl, olddecl);
808 else if (DECL_DECLARED_INLINE_P (olddecl)
809 && DECL_UNINLINABLE (newdecl)
810 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
812 warning ("%Jfunction '%D' redeclared with attribute noinline",
814 warning ("%Jprevious declaration of function '%D' was inline",
819 DECL_ATTRIBUTES (newdecl)
820 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
823 if (TREE_CODE (newtype) == ERROR_MARK
824 || TREE_CODE (oldtype) == ERROR_MARK)
827 /* New decl is completely inconsistent with the old one =>
828 tell caller to replace the old one.
829 This is always an error except in the case of shadowing a builtin. */
830 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
832 if (TREE_CODE (olddecl) == FUNCTION_DECL
833 && DECL_BUILT_IN (olddecl))
835 /* If you declare a built-in or predefined function name as static,
836 the old definition is overridden,
837 but optionally warn this was a bad choice of name. */
838 if (!TREE_PUBLIC (newdecl))
841 warning ("%Jshadowing built-in function '%D'",
845 warning ("%Jbuilt-in function '%D' declared as non-function",
850 error ("%J'%D' redeclared as different kind of symbol",
852 error ("%Jprevious declaration of '%D'", olddecl, olddecl);
858 /* For real parm decl following a forward decl, return 1 so old decl
859 will be reused. Only allow this to happen once. */
860 if (types_match && TREE_CODE (newdecl) == PARM_DECL
861 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
863 TREE_ASM_WRITTEN (olddecl) = 0;
867 /* The new declaration is the same kind of object as the old one.
868 The declarations may partially match. Print warnings if they don't
869 match enough. Ultimately, copy most of the information from the new
870 decl to the old one, and keep using the old one. */
872 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
874 /* A function declaration for a built-in function. */
875 if (!TREE_PUBLIC (newdecl))
877 /* If you declare a built-in function name as static, the
878 built-in definition is overridden,
879 but optionally warn this was a bad choice of name. */
881 warning ("%Jshadowing built-in function '%D'", newdecl, newdecl);
882 /* Discard the old built-in function. */
887 /* Accept harmless mismatch in function types.
888 This is for the ffs and fprintf builtins. */
889 tree trytype = match_builtin_function_types (oldtype, newtype);
893 types_match = comptypes (newtype, trytype, COMPARE_STRICT);
896 if (! different_binding_level)
897 TREE_TYPE (olddecl) = oldtype;
902 /* If types don't match for a built-in, throw away the built-in. */
903 warning ("%Jconflicting types for built-in function '%D'",
908 else if (TREE_CODE (olddecl) == FUNCTION_DECL && !TREE_LOCUS_SET_P (olddecl))
910 /* A function declaration for a predeclared function
911 that isn't actually built in. */
912 if (!TREE_PUBLIC (newdecl))
914 /* If you declare it as static, the
915 default definition is overridden. */
918 else if (!types_match)
920 /* If the types don't match, preserve volatility indication.
921 Later on, we will discard everything else about the
922 default declaration. */
923 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
926 /* Permit char *foo () to match void *foo (...) if not pedantic,
927 if one of them came from a system header file. */
928 else if (!types_match
929 && TREE_CODE (olddecl) == FUNCTION_DECL
930 && TREE_CODE (newdecl) == FUNCTION_DECL
931 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
932 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
933 && (DECL_IN_SYSTEM_HEADER (olddecl)
934 || DECL_IN_SYSTEM_HEADER (newdecl))
935 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
936 && TYPE_ARG_TYPES (oldtype) == 0
937 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
938 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
940 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
941 && TYPE_ARG_TYPES (newtype) == 0
942 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
943 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
946 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
947 /* Make sure we keep void * as ret type, not char *. */
948 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
949 TREE_TYPE (newdecl) = newtype = oldtype;
951 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
952 we will come back here again. */
953 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
955 /* Permit void foo (...) to match int foo (...) if the latter is the
956 definition and implicit int was used. See c-torture/compile/920625-2.c. */
957 else if (!types_match && new_is_definition
958 && TREE_CODE (olddecl) == FUNCTION_DECL
959 && TREE_CODE (newdecl) == FUNCTION_DECL
960 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
961 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
962 && C_FUNCTION_IMPLICIT_INT (newdecl))
964 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
965 /* Make sure we keep void as the return type. */
966 TREE_TYPE (newdecl) = newtype = oldtype;
967 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
969 else if (!types_match
970 /* Permit char *foo (int, ...); followed by char *foo ();
972 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
974 /* Return types must still match. */
975 && comptypes (TREE_TYPE (oldtype),
976 TREE_TYPE (newtype), COMPARE_STRICT)
977 && TYPE_ARG_TYPES (newtype) == 0))
979 error ("%Jconflicting types for '%D'", newdecl, newdecl);
980 /* Check for function type mismatch
981 involving an empty arglist vs a nonempty one. */
982 if (TREE_CODE (olddecl) == FUNCTION_DECL
983 && comptypes (TREE_TYPE (oldtype),
984 TREE_TYPE (newtype), COMPARE_STRICT)
985 && ((TYPE_ARG_TYPES (oldtype) == 0
986 && DECL_INITIAL (olddecl) == 0)
988 (TYPE_ARG_TYPES (newtype) == 0
989 && DECL_INITIAL (newdecl) == 0)))
991 /* Classify the problem further. */
992 tree t = TYPE_ARG_TYPES (oldtype);
994 t = TYPE_ARG_TYPES (newtype);
995 for (; t; t = TREE_CHAIN (t))
997 tree type = TREE_VALUE (t);
999 if (TREE_CHAIN (t) == 0
1000 && TYPE_MAIN_VARIANT (type) != void_type_node)
1002 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1006 if (c_type_promotes_to (type) != type)
1008 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1013 if (C_DECL_IMPLICIT (olddecl))
1014 error ("%Jprevious implicit declaration of '%D'", olddecl, olddecl);
1016 error ("%Jprevious declaration of '%D'", olddecl, olddecl);
1018 /* This is safer because the initializer might contain references
1019 to variables that were declared between olddecl and newdecl. This
1020 will make the initializer invalid for olddecl in case it gets
1021 assigned to olddecl below. */
1022 if (TREE_CODE (newdecl) == VAR_DECL)
1023 DECL_INITIAL (newdecl) = 0;
1025 /* TLS cannot follow non-TLS declaration. */
1026 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1027 && !DECL_THREAD_LOCAL (olddecl) && DECL_THREAD_LOCAL (newdecl))
1029 error ("%Jthread-local declaration of '%D' follows non thread-local "
1030 "declaration", newdecl, newdecl);
1031 error ("%Jprevious declaration of '%D'", olddecl, olddecl);
1033 /* non-TLS declaration cannot follow TLS declaration. */
1034 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1035 && DECL_THREAD_LOCAL (olddecl) && !DECL_THREAD_LOCAL (newdecl))
1037 error ("%Jnon thread-local declaration of '%D' follows "
1038 "thread-local declaration", newdecl, newdecl);
1039 error ("%Jprevious declaration of '%D'", olddecl, olddecl);
1043 errmsg = redeclaration_error_message (newdecl, olddecl);
1049 error ("%Jredefinition of '%D'", newdecl, newdecl);
1052 error ("%Jredeclaration of '%D'", newdecl, newdecl);
1055 error ("%Jconflicting declarations of '%D'", newdecl, newdecl);
1061 if (DECL_INITIAL (olddecl)
1062 && current_scope == global_scope)
1063 error ("%J'%D' previously defined here", olddecl, olddecl);
1065 error ("%J'%D' previously declared here", olddecl, olddecl);
1068 else if (TREE_CODE (newdecl) == TYPE_DECL
1069 && (DECL_IN_SYSTEM_HEADER (olddecl)
1070 || DECL_IN_SYSTEM_HEADER (newdecl)))
1072 warning ("%Jredefinition of '%D'", newdecl, newdecl);
1073 if (DECL_INITIAL (olddecl) && current_scope == global_scope)
1074 warning ("%J'%D' previously defined here", olddecl, olddecl);
1076 warning ("%J'%D' previously declared here", olddecl, olddecl);
1078 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1079 && DECL_INITIAL (olddecl) != 0
1080 && TYPE_ARG_TYPES (oldtype) == 0
1081 && TYPE_ARG_TYPES (newtype) != 0
1082 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1086 /* Prototype decl follows defn w/o prototype. */
1088 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1089 type = TYPE_ARG_TYPES (newtype),
1092 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1094 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1095 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1097 warning ("%Jprototype for '%D' follows", newdecl, newdecl);
1098 warning ("%Jnon-prototype definition here", olddecl);
1101 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1102 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1104 error ("%Jprototype for '%D' follows and number of "
1105 "arguments doesn't match", newdecl, newdecl);
1106 error ("%Jnon-prototype definition here", olddecl);
1110 /* Type for passing arg must be consistent
1111 with that declared for the arg. */
1112 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type),
1115 error ("%Jprototype for '%D' follows and argument %d "
1116 "doesn't match", newdecl, newdecl, nargs);
1117 error ("%Jnon-prototype definition here", olddecl);
1123 /* Warn about mismatches in various flags. */
1126 /* Warn if function is now inline
1127 but was previously declared not inline and has been called. */
1128 if (TREE_CODE (olddecl) == FUNCTION_DECL
1129 && ! DECL_DECLARED_INLINE_P (olddecl)
1130 && DECL_DECLARED_INLINE_P (newdecl)
1131 && TREE_USED (olddecl))
1132 warning ("%J'%D' declared inline after being called",
1134 if (TREE_CODE (olddecl) == FUNCTION_DECL
1135 && ! DECL_DECLARED_INLINE_P (olddecl)
1136 && DECL_DECLARED_INLINE_P (newdecl)
1137 && DECL_INITIAL (olddecl) != 0)
1138 warning ("%J'%D' declared inline after its definition",
1141 /* If pedantic, warn when static declaration follows a non-static
1142 declaration. Otherwise, do so only for functions. */
1143 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1144 && TREE_PUBLIC (olddecl)
1145 && !TREE_PUBLIC (newdecl))
1146 warning ("%Jstatic declaration for '%D' follows non-static",
1149 /* If warn_traditional, warn when a non-static function
1150 declaration follows a static one. */
1151 if (warn_traditional && !in_system_header
1152 && TREE_CODE (olddecl) == FUNCTION_DECL
1153 && !TREE_PUBLIC (olddecl)
1154 && TREE_PUBLIC (newdecl))
1155 warning ("%Jnon-static declaration for '%D' follows static",
1158 /* Warn when const declaration follows a non-const
1159 declaration, but not for functions. */
1160 if (TREE_CODE (olddecl) != FUNCTION_DECL
1161 && !TREE_READONLY (olddecl)
1162 && TREE_READONLY (newdecl))
1163 warning ("%Jconst declaration for '%D' follows non-const",
1165 /* These bits are logically part of the type, for variables.
1166 But not for functions
1167 (where qualifiers are not valid ANSI anyway). */
1168 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1169 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1170 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1171 pedwarn ("%Jtype qualifiers for '%D' conflict with previous "
1172 "declaration", newdecl, newdecl);
1176 /* Optionally warn about more than one declaration for the same name. */
1177 if (errmsg == 0 && warn_redundant_decls && TREE_LOCUS_SET_P (olddecl)
1178 /* Don't warn about a function declaration
1179 followed by a definition. */
1180 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1181 && DECL_INITIAL (olddecl) == 0)
1182 /* Don't warn about extern decl followed by (tentative) definition. */
1183 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1185 warning ("%Jredundant redeclaration of '%D' in same scope",
1187 warning ("%Jprevious declaration of '%D'", olddecl, olddecl);
1190 /* Copy all the DECL_... slots specified in the new decl
1191 except for any that we copy here from the old type.
1193 Past this point, we don't change OLDTYPE and NEWTYPE
1194 even if we change the types of NEWDECL and OLDDECL. */
1198 /* When copying info to olddecl, we store into write_olddecl
1199 instead. This allows us to avoid modifying olddecl when
1200 different_binding_level is true. */
1201 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1203 /* Merge the data types specified in the two decls. */
1204 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1206 if (different_binding_level)
1208 if (TYPE_ARG_TYPES (oldtype) != 0
1209 && TYPE_ARG_TYPES (newtype) == 0)
1210 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1213 = build_type_attribute_variant
1215 merge_attributes (TYPE_ATTRIBUTES (newtype),
1216 TYPE_ATTRIBUTES (oldtype)));
1220 = TREE_TYPE (olddecl)
1221 = common_type (newtype, oldtype);
1224 /* Lay the type out, unless already done. */
1225 if (oldtype != TREE_TYPE (newdecl))
1227 if (TREE_TYPE (newdecl) != error_mark_node)
1228 layout_type (TREE_TYPE (newdecl));
1229 if (TREE_CODE (newdecl) != FUNCTION_DECL
1230 && TREE_CODE (newdecl) != TYPE_DECL
1231 && TREE_CODE (newdecl) != CONST_DECL)
1232 layout_decl (newdecl, 0);
1236 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1237 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1238 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1239 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1240 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1241 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1243 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1244 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1248 /* Keep the old rtl since we can safely use it. */
1249 COPY_DECL_RTL (olddecl, newdecl);
1251 /* Merge the type qualifiers. */
1252 if (TREE_READONLY (newdecl))
1253 TREE_READONLY (write_olddecl) = 1;
1255 if (TREE_THIS_VOLATILE (newdecl))
1257 TREE_THIS_VOLATILE (write_olddecl) = 1;
1258 if (TREE_CODE (newdecl) == VAR_DECL
1259 /* If an automatic variable is re-declared in the same
1260 function scope, but the old declaration was not
1261 volatile, make_var_volatile() would crash because the
1262 variable would have been assigned to a pseudo, not a
1263 MEM. Since this duplicate declaration is invalid
1264 anyway, we just skip the call. */
1266 make_var_volatile (newdecl);
1269 /* Keep source location of definition rather than declaration. */
1270 /* When called with different_binding_level set, keep the old
1271 information so that meaningful diagnostics can be given. */
1272 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1273 && ! different_binding_level)
1274 copy_tree_locus (newdecl, olddecl);
1276 /* Merge the unused-warning information. */
1277 if (DECL_IN_SYSTEM_HEADER (olddecl))
1278 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1279 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1280 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1282 /* Merge the initialization information. */
1283 /* When called with different_binding_level set, don't copy over
1284 DECL_INITIAL, so that we don't accidentally change function
1285 declarations into function definitions. */
1286 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1287 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1289 /* Merge the section attribute.
1290 We want to issue an error if the sections conflict but that must be
1291 done later in decl_attributes since we are called before attributes
1293 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1294 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1296 /* Copy the assembler name.
1297 Currently, it can only be defined in the prototype. */
1298 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1300 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1302 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1303 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1304 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1305 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1306 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1307 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1308 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1309 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1310 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1313 /* If cannot merge, then use the new type and qualifiers,
1314 and don't preserve the old rtl. */
1315 else if (! different_binding_level)
1317 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1318 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1319 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1320 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1323 /* Merge the storage class information. */
1324 merge_weak (newdecl, olddecl);
1326 /* For functions, static overrides non-static. */
1327 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1329 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1330 /* This is since we don't automatically
1331 copy the attributes of NEWDECL into OLDDECL. */
1332 /* No need to worry about different_binding_level here because
1333 then TREE_PUBLIC (newdecl) was true. */
1334 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1335 /* If this clears `static', clear it in the identifier too. */
1336 if (! TREE_PUBLIC (olddecl))
1337 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1339 if (DECL_EXTERNAL (newdecl))
1341 if (! different_binding_level || different_tu)
1343 /* Don't mess with these flags on local externs; they remain
1344 external even if there's a declaration at file scope which
1346 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1347 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1349 /* An extern decl does not override previous storage class. */
1350 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1351 if (! DECL_EXTERNAL (newdecl))
1353 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1354 /* If we have two non-EXTERNAL file-scope decls that are
1355 the same, only one of them should be written out. */
1357 TREE_ASM_WRITTEN (newdecl) = 1;
1362 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1363 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1366 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1368 /* If we're redefining a function previously defined as extern
1369 inline, make sure we emit debug info for the inline before we
1370 throw it away, in case it was inlined into a function that hasn't
1371 been written out yet. */
1372 if (new_is_definition && DECL_INITIAL (olddecl))
1374 if (TREE_USED (olddecl))
1375 (*debug_hooks->outlining_inline_function) (olddecl);
1377 /* The new defn must not be inline. */
1378 DECL_INLINE (newdecl) = 0;
1379 DECL_UNINLINABLE (newdecl) = 1;
1383 /* If either decl says `inline', this fn is inline,
1384 unless its definition was passed already. */
1385 if (DECL_DECLARED_INLINE_P (newdecl)
1386 || DECL_DECLARED_INLINE_P (olddecl))
1387 DECL_DECLARED_INLINE_P (newdecl) = 1;
1389 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1390 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1393 if (DECL_BUILT_IN (olddecl))
1395 /* Get rid of any built-in function if new arg types don't match it
1396 or if we have a function definition. */
1397 if (! types_match || new_is_definition)
1399 if (! different_binding_level)
1401 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1402 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1407 /* If redeclaring a builtin function, and not a definition,
1408 it stays built in. */
1409 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1410 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1414 /* Also preserve various other info from the definition. */
1415 if (! new_is_definition)
1417 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1418 /* When called with different_binding_level set, don't copy over
1419 DECL_INITIAL, so that we don't accidentally change function
1420 declarations into function definitions. */
1421 if (! different_binding_level)
1422 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1423 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1424 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1425 DECL_ESTIMATED_INSNS (newdecl) = DECL_ESTIMATED_INSNS (olddecl);
1426 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1428 /* Set DECL_INLINE on the declaration if we've got a body
1429 from which to instantiate. */
1430 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1432 DECL_INLINE (newdecl) = 1;
1433 DECL_ABSTRACT_ORIGIN (newdecl)
1434 = (different_binding_level
1435 ? DECL_ORIGIN (olddecl)
1436 : DECL_ABSTRACT_ORIGIN (olddecl));
1441 /* If a previous declaration said inline, mark the
1442 definition as inlinable. */
1443 if (DECL_DECLARED_INLINE_P (newdecl)
1444 && ! DECL_UNINLINABLE (newdecl))
1445 DECL_INLINE (newdecl) = 1;
1448 if (different_binding_level)
1451 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1452 But preserve OLDDECL's DECL_UID. */
1454 unsigned olddecl_uid = DECL_UID (olddecl);
1456 memcpy ((char *) olddecl + sizeof (struct tree_common),
1457 (char *) newdecl + sizeof (struct tree_common),
1458 sizeof (struct tree_decl) - sizeof (struct tree_common));
1459 DECL_UID (olddecl) = olddecl_uid;
1462 /* NEWDECL contains the merged attribute lists.
1463 Update OLDDECL to be the same. */
1464 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1466 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1467 so that encode_section_info has a chance to look at the new decl
1468 flags and attributes. */
1469 if (DECL_RTL_SET_P (olddecl)
1470 && (TREE_CODE (olddecl) == FUNCTION_DECL
1471 || (TREE_CODE (olddecl) == VAR_DECL
1472 && TREE_STATIC (olddecl))))
1473 make_decl_rtl (olddecl, NULL);
1478 /* Return any external DECL associated with ID, whether or not it is
1479 currently in scope. */
1482 any_external_decl (tree id)
1484 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1487 if (decl == 0 || TREE_CODE (decl) == ERROR_MARK)
1489 else if (TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1492 t = purpose_member (id, truly_local_externals);
1494 return TREE_VALUE (t);
1499 /* Record an external decl DECL. This only does something if a
1500 shadowing decl already exists. */
1502 record_external_decl (tree decl)
1504 tree name = DECL_NAME (decl);
1505 if (!IDENTIFIER_SYMBOL_VALUE (name))
1508 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1511 /* Check whether decl-node X shadows an existing declaration.
1512 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1513 which might be a NULL_TREE. */
1515 warn_if_shadowing (tree x, tree old)
1519 /* Nothing to shadow? */
1521 /* Shadow warnings not wanted? */
1523 /* No shadow warnings for internally generated vars. */
1524 || !TREE_LOCUS_SET_P (x)
1525 /* No shadow warnings for vars made for inlining. */
1526 || DECL_FROM_INLINE (x)
1527 /* Don't warn about the parm names in function declarator
1528 within a function declarator.
1529 It would be nice to avoid warning in any function
1530 declarator in a declaration, as opposed to a definition,
1531 but there is no way to tell it's not a definition. */
1532 || (TREE_CODE (x) == PARM_DECL && current_scope->outer->parm_flag))
1535 name = IDENTIFIER_POINTER (DECL_NAME (x));
1536 if (TREE_CODE (old) == PARM_DECL)
1537 shadow_warning (SW_PARAM, name, old);
1538 else if (DECL_FILE_SCOPE_P (old))
1539 shadow_warning (SW_GLOBAL, name, old);
1541 shadow_warning (SW_LOCAL, name, old);
1545 /* Subroutine of pushdecl.
1547 X is a TYPE_DECL for a typedef statement. Create a brand new
1548 ..._TYPE node (which will be just a variant of the existing
1549 ..._TYPE node with identical properties) and then install X
1550 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1552 The whole point here is to end up with a situation where each
1553 and every ..._TYPE node the compiler creates will be uniquely
1554 associated with AT MOST one node representing a typedef name.
1555 This way, even though the compiler substitutes corresponding
1556 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1557 early on, later parts of the compiler can always do the reverse
1558 translation and get back the corresponding typedef name. For
1561 typedef struct S MY_TYPE;
1564 Later parts of the compiler might only know that `object' was of
1565 type `struct S' if it were not for code just below. With this
1566 code however, later parts of the compiler see something like:
1568 struct S' == struct S
1569 typedef struct S' MY_TYPE;
1572 And they can then deduce (from the node for type struct S') that
1573 the original object declaration was:
1577 Being able to do this is important for proper support of protoize,
1578 and also for generating precise symbolic debugging information
1579 which takes full account of the programmer's (typedef) vocabulary.
1581 Obviously, we don't want to generate a duplicate ..._TYPE node if
1582 the TYPE_DECL node that we are now processing really represents a
1583 standard built-in type.
1585 Since all standard types are effectively declared at line zero
1586 in the source file, we can easily check to see if we are working
1587 on a standard type by checking the current value of lineno. */
1590 clone_underlying_type (tree x)
1592 if (!TREE_LOCUS_SET_P (x))
1594 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1595 TYPE_NAME (TREE_TYPE (x)) = x;
1597 else if (TREE_TYPE (x) != error_mark_node
1598 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1600 tree tt = TREE_TYPE (x);
1601 DECL_ORIGINAL_TYPE (x) = tt;
1602 tt = build_type_copy (tt);
1604 TREE_USED (tt) = TREE_USED (x);
1609 /* Record a decl-node X as belonging to the current lexical scope.
1610 Check for errors (such as an incompatible declaration for the same
1611 name already seen in the same scope).
1613 Returns either X or an old decl for the same name.
1614 If an old decl is returned, it may have been smashed
1615 to agree with what X says. */
1620 tree name = DECL_NAME (x);
1621 struct c_scope *scope = current_scope;
1623 #ifdef ENABLE_CHECKING
1624 if (error_mark_node == 0)
1625 /* Called too early. */
1629 /* Functions need the lang_decl data. */
1630 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1631 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1633 /* A local extern declaration for a function doesn't constitute nesting.
1634 A local auto declaration does, since it's a forward decl
1635 for a nested function coming later. */
1636 if (current_function_decl == NULL
1637 || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1638 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
1639 DECL_CONTEXT (x) = current_file_decl;
1641 DECL_CONTEXT (x) = current_function_decl;
1647 if (warn_nested_externs
1648 && scope != global_scope
1649 && DECL_EXTERNAL (x)
1650 && !DECL_IN_SYSTEM_HEADER (x))
1651 warning ("nested extern declaration of `%s'",
1652 IDENTIFIER_POINTER (name));
1654 old = lookup_name_current_level (name);
1655 if (old && duplicate_decls (x, old, 0, false))
1657 /* For PARM_DECLs, old may be a forward declaration.
1658 If so, we want to remove it from its old location
1659 (in the variables chain) and rechain it in the
1660 location given by the new declaration. */
1661 if (TREE_CODE (x) == PARM_DECL)
1664 for (p = &scope->names; *p; p = &TREE_CHAIN (*p))
1667 *p = TREE_CHAIN (old);
1668 SCOPE_LIST_APPEND (scope, parms, old);
1674 if (DECL_EXTERNAL (x) || scope == global_scope)
1676 /* Find and check against a previous, not-in-scope, external
1677 decl for this identifier. (C99 s???: If two declarations
1678 with external linkage, referring to the same object, have
1679 incompatible types, the behavior is undefined). */
1680 tree ext = any_external_decl (name);
1683 if (duplicate_decls (x, ext, scope != global_scope,
1685 x = copy_node (ext);
1688 record_external_decl (x);
1691 if (TREE_CODE (x) == TYPE_DECL)
1692 clone_underlying_type (x);
1694 /* If storing a local value, there may already be one
1695 (inherited). If so, record it for restoration when this
1696 scope ends. Take care not to do this if we are replacing an
1697 older decl in the same scope (i.e. duplicate_decls returned
1699 if (scope != global_scope
1700 && IDENTIFIER_SYMBOL_VALUE (name)
1701 && IDENTIFIER_SYMBOL_VALUE (name) != old)
1703 warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
1704 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1708 /* Install the new declaration in the requested scope. */
1709 IDENTIFIER_SYMBOL_VALUE (name) = x;
1710 C_DECL_INVISIBLE (x) = 0;
1712 /* If x's type is incomplete because it's based on a
1713 structure or union which has not yet been fully declared,
1714 attach it to that structure or union type, so we can go
1715 back and complete the variable declaration later, if the
1716 structure or union gets fully declared.
1718 If the input is erroneous, we can have error_mark in the type
1719 slot (e.g. "f(void a, ...)") - that doesn't count as an
1721 if (TREE_TYPE (x) != error_mark_node
1722 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1724 tree element = TREE_TYPE (x);
1726 while (TREE_CODE (element) == ARRAY_TYPE)
1727 element = TREE_TYPE (element);
1728 element = TYPE_MAIN_VARIANT (element);
1730 if ((TREE_CODE (element) == RECORD_TYPE
1731 || TREE_CODE (element) == UNION_TYPE)
1732 && (TREE_CODE (x) != TYPE_DECL
1733 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
1734 && !COMPLETE_TYPE_P (element))
1735 C_TYPE_INCOMPLETE_VARS (element)
1736 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
1740 if (TREE_CODE (x) == PARM_DECL)
1741 SCOPE_LIST_APPEND (scope, parms, x);
1743 SCOPE_LIST_APPEND (scope, names, x);
1748 /* Record X as belonging to the global scope (C99 "file scope").
1749 This is used only internally by the Objective-C front end,
1750 and is limited to its needs. duplicate_decls is not called;
1751 if there is any preexisting decl for this identifier, it is an ICE. */
1754 pushdecl_top_level (tree x)
1758 if (TREE_CODE (x) != VAR_DECL)
1761 name = DECL_NAME (x);
1763 if (IDENTIFIER_SYMBOL_VALUE (name))
1766 DECL_CONTEXT (x) = current_file_decl;
1767 IDENTIFIER_SYMBOL_VALUE (name) = x;
1769 SCOPE_LIST_APPEND (global_scope, names, x);
1773 /* Generate an implicit declaration for identifier FUNCTIONID as a
1774 function of type int (). */
1777 implicitly_declare (tree functionid)
1779 tree decl = any_external_decl (functionid);
1783 /* Implicit declaration of a function already declared
1784 (somehow) in a different scope, or as a built-in.
1785 If this is the first time this has happened, warn;
1786 then recycle the old declaration. */
1787 if (!C_DECL_IMPLICIT (decl))
1789 implicit_decl_warning (DECL_NAME (decl));
1790 if (! DECL_FILE_SCOPE_P (decl))
1791 warning ("%Jprevious declaration of '%D'", decl, decl);
1792 C_DECL_IMPLICIT (decl) = 1;
1794 /* If this function is global, then it must already be in the
1795 global scope, so there's no need to push it again. */
1796 if (current_scope == global_scope)
1798 /* If this is a local declaration, make a copy; we can't have
1799 the same DECL listed in two different scopes. */
1800 return pushdecl (copy_node (decl));
1803 /* Not seen before. */
1804 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1805 DECL_EXTERNAL (decl) = 1;
1806 TREE_PUBLIC (decl) = 1;
1807 C_DECL_IMPLICIT (decl) = 1;
1808 implicit_decl_warning (functionid);
1810 /* C89 says implicit declarations are in the innermost block.
1811 So we record the decl in the standard fashion. */
1812 decl = pushdecl (decl);
1814 /* No need to call objc_check_decl here - it's a function type. */
1815 rest_of_decl_compilation (decl, NULL, 0, 0);
1817 /* Write a record describing this implicit function declaration
1818 to the prototypes file (if requested). */
1819 gen_aux_info_record (decl, 0, 1, 0);
1821 /* Possibly apply some default attributes to this implicit declaration. */
1822 decl_attributes (&decl, NULL_TREE, 0);
1828 implicit_decl_warning (tree id)
1830 const char *name = IDENTIFIER_POINTER (id);
1831 if (mesg_implicit_function_declaration == 2)
1832 error ("implicit declaration of function `%s'", name);
1833 else if (mesg_implicit_function_declaration == 1)
1834 warning ("implicit declaration of function `%s'", name);
1837 /* Return zero if the declaration NEWDECL is valid
1838 when the declaration OLDDECL (assumed to be for the same name)
1839 has already been seen.
1840 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
1841 and 3 if it is a conflicting declaration. */
1844 redeclaration_error_message (tree newdecl, tree olddecl)
1846 if (TREE_CODE (newdecl) == TYPE_DECL)
1848 /* Do not complain about type redeclarations where at least one
1849 declaration was in a system header. */
1850 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
1854 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1856 /* Declarations of functions can insist on internal linkage
1857 but they can't be inconsistent with internal linkage,
1858 so there can be no error on that account.
1859 However defining the same name twice is no good. */
1860 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
1861 /* However, defining once as extern inline and a second
1862 time in another way is ok. */
1863 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
1864 && ! (DECL_DECLARED_INLINE_P (newdecl)
1865 && DECL_EXTERNAL (newdecl))))
1869 else if (DECL_FILE_SCOPE_P (newdecl))
1871 /* Objects declared at file scope: */
1872 /* If at least one is a reference, it's ok. */
1873 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
1875 /* Reject two definitions. */
1876 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
1878 /* Now we have two tentative defs, or one tentative and one real def. */
1879 /* Insist that the linkage match. */
1880 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
1884 else if (current_scope->parm_flag
1885 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1889 /* Newdecl has block scope. If olddecl has block scope also, then
1890 reject two definitions, and reject a definition together with an
1891 external reference. Otherwise, it is OK, because newdecl must
1892 be an extern reference to olddecl. */
1893 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
1894 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
1900 /* Issue an error message for a reference to an undeclared variable
1901 ID, including a reference to a builtin outside of function-call
1902 context. Establish a binding of the identifier to error_mark_node
1903 in an appropriate scope, which will suppress further errors for the
1906 undeclared_variable (tree id)
1908 static bool already = false;
1909 struct c_scope *scope;
1911 if (current_function_decl == 0)
1913 error ("`%s' undeclared here (not in a function)",
1914 IDENTIFIER_POINTER (id));
1915 scope = current_scope;
1919 error ("`%s' undeclared (first use in this function)",
1920 IDENTIFIER_POINTER (id));
1924 error ("(Each undeclared identifier is reported only once");
1925 error ("for each function it appears in.)");
1929 scope = current_function_scope;
1932 scope->shadowed = tree_cons (id, IDENTIFIER_SYMBOL_VALUE (id),
1934 IDENTIFIER_SYMBOL_VALUE (id) = error_mark_node;
1937 /* Subroutine of lookup_label, declare_label, define_label: construct a
1938 LABEL_DECL with all the proper frills. */
1941 make_label (tree name, location_t location)
1943 tree label = build_decl (LABEL_DECL, name, void_type_node);
1945 DECL_CONTEXT (label) = current_function_decl;
1946 DECL_MODE (label) = VOIDmode;
1947 set_tree_locus (label, location);
1952 /* Another subroutine of lookup_label, declare_label, define_label:
1953 set up the binding of name to LABEL_DECL in the given SCOPE. */
1956 bind_label (tree name, tree label, struct c_scope *scope)
1958 if (IDENTIFIER_LABEL_VALUE (name))
1959 scope->shadowed = tree_cons (name, IDENTIFIER_LABEL_VALUE (name),
1961 IDENTIFIER_LABEL_VALUE (name) = label;
1963 SCOPE_LIST_APPEND (scope, names, label);
1966 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
1967 Create one if none exists so far for the current function.
1968 This is called when a label is used in a goto expression or
1969 has its address taken. */
1972 lookup_label (tree name)
1976 if (current_function_decl == 0)
1978 error ("label %s referenced outside of any function",
1979 IDENTIFIER_POINTER (name));
1983 /* Use a label already defined or ref'd with this name, but not if
1984 it is inherited from a containing function and wasn't declared
1986 label = IDENTIFIER_LABEL_VALUE (name);
1987 if (label && (DECL_CONTEXT (label) == current_function_decl
1988 || C_DECLARED_LABEL_FLAG (label)))
1990 /* If the label has only been declared, update its apparent
1991 location to point here, for better diagnostics if it
1992 turns out not to have been defined. */
1993 if (!TREE_USED (label))
1994 set_tree_locus (label, input_location);
1998 /* No label binding for that identifier; make one. */
1999 label = make_label (name, input_location);
2001 /* Ordinary labels go in the current function scope. */
2002 bind_label (name, label, current_function_scope);
2006 /* Make a label named NAME in the current function, shadowing silently
2007 any that may be inherited from containing functions or containing
2008 scopes. This is called for __label__ declarations. */
2010 /* Note that valid use, if the label being shadowed comes from another
2011 scope in the same function, requires calling declare_nonlocal_label
2012 right away. (Is this still true? -zw 2003-07-17) */
2015 declare_label (tree name)
2017 tree label = IDENTIFIER_LABEL_VALUE (name);
2020 /* Check to make sure that the label hasn't already been declared
2022 for (dup = current_scope->names; dup; dup = TREE_CHAIN (dup))
2025 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2026 error ("%Jthis is a previous declaration", dup);
2028 /* Just use the previous declaration. */
2032 label = make_label (name, input_location);
2033 C_DECLARED_LABEL_FLAG (label) = 1;
2035 /* Declared labels go in the current scope. */
2036 bind_label (name, label, current_scope);
2040 /* Define a label, specifying the location in the source file.
2041 Return the LABEL_DECL node for the label, if the definition is valid.
2042 Otherwise return 0. */
2045 define_label (location_t location, tree name)
2049 /* Find any preexisting label with this name. It is an error
2050 if that label has already been defined in this function, or
2051 if there is a containing function with a declared label with
2053 label = IDENTIFIER_LABEL_VALUE (name);
2056 && ((DECL_CONTEXT (label) == current_function_decl
2057 && DECL_INITIAL (label) != 0)
2058 || (DECL_CONTEXT (label) != current_function_decl
2059 && C_DECLARED_LABEL_FLAG (label))))
2061 error ("%Hduplicate label `%D'", &location, label);
2062 if (DECL_INITIAL (label))
2063 error ("%J`%D' previously defined here", label, label);
2065 error ("%J`%D' previously declared here", label, label);
2068 else if (label && DECL_CONTEXT (label) == current_function_decl)
2070 /* The label has been used or declared already in this function,
2071 but not defined. Update its location to point to this
2073 set_tree_locus (label, location);
2077 /* No label binding for that identifier; make one. */
2078 label = make_label (name, location);
2080 /* Ordinary labels go in the current function scope. */
2081 bind_label (name, label, current_function_scope);
2084 if (warn_traditional && !in_system_header && lookup_name (name))
2085 warning ("%Htraditional C lacks a separate namespace for labels, "
2086 "identifier `%s' conflicts", &location,
2087 IDENTIFIER_POINTER (name));
2089 /* Mark label as having been defined. */
2090 DECL_INITIAL (label) = error_mark_node;
2094 /* Return the list of declarations of the current scope. */
2099 return current_scope->names;
2103 /* Given NAME, an IDENTIFIER_NODE,
2104 return the structure (or union or enum) definition for that name.
2105 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2106 CODE says which kind of type the caller wants;
2107 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2108 If the wrong kind of type is found, an error is reported. */
2111 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2113 tree tag = IDENTIFIER_TAG_VALUE (name);
2119 /* We only care about whether it's in this level if
2120 thislevel_only was set or it might be a type clash. */
2121 if (thislevel_only || TREE_CODE (tag) != code)
2123 if (current_scope == global_scope
2124 || purpose_member (name, current_scope->tags))
2128 if (thislevel_only && !thislevel)
2131 if (TREE_CODE (tag) != code)
2133 /* Definition isn't the kind we were looking for. */
2134 pending_invalid_xref = name;
2135 pending_invalid_xref_location = input_location;
2137 /* If in the same binding level as a declaration as a tag
2138 of a different type, this must not be allowed to
2139 shadow that tag, so give the error immediately.
2140 (For example, "struct foo; union foo;" is invalid.) */
2142 pending_xref_error ();
2147 /* Print an error message now
2148 for a recent invalid struct, union or enum cross reference.
2149 We don't print them immediately because they are not invalid
2150 when used in the `struct foo;' construct for shadowing. */
2153 pending_xref_error (void)
2155 if (pending_invalid_xref != 0)
2156 error ("%H`%s' defined as wrong kind of tag",
2157 &pending_invalid_xref_location,
2158 IDENTIFIER_POINTER (pending_invalid_xref));
2159 pending_invalid_xref = 0;
2163 /* Look up NAME in the current scope and its superiors
2164 in the namespace of variables, functions and typedefs.
2165 Return a ..._DECL node of some kind representing its definition,
2166 or return 0 if it is undefined. */
2169 lookup_name (tree name)
2171 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2172 if (decl == 0 || decl == error_mark_node)
2174 if (C_DECL_INVISIBLE (decl))
2179 /* Similar to `lookup_name' but look only at the current scope. */
2182 lookup_name_current_level (tree name)
2184 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2186 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2189 if (current_scope == global_scope)
2192 /* Scan the current scope for a decl with name NAME.
2193 For PARM_DECLs, we have to look at both ->parms and ->names, since
2194 forward parameter declarations wind up on the ->names list. */
2195 if (TREE_CODE (decl) == PARM_DECL
2196 && chain_member (decl, current_scope->parms))
2198 if (chain_member (decl, current_scope->names))
2204 /* Create the predefined scalar types of C,
2205 and some nodes representing standard constants (0, 1, (void *) 0).
2206 Initialize the global scope.
2207 Make definitions for built-in primitive functions. */
2210 c_init_decl_processing (void)
2213 tree ptr_ftype_void, ptr_ftype_ptr;
2214 location_t save_loc = input_location;
2216 /* Adds some ggc roots, and reserved words for c-parse.in. */
2219 current_function_decl = 0;
2221 /* Make the c_scope structure for global names. */
2223 global_scope = current_scope;
2225 /* Declarations from c_common_nodes_and_builtins must not be associated
2226 with this input file, lest we get differences between using and not
2227 using preprocessed headers. */
2228 input_location.file = "<internal>";
2229 input_location.line = 0;
2231 /* Make the DECL for the toplevel file scope. */
2232 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
2234 build_common_tree_nodes (flag_signed_char);
2236 c_common_nodes_and_builtins ();
2238 /* In C, comparisons and TRUTH_* expressions have type int. */
2239 truthvalue_type_node = integer_type_node;
2240 truthvalue_true_node = integer_one_node;
2241 truthvalue_false_node = integer_zero_node;
2243 /* Even in C99, which has a real boolean type. */
2244 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2245 boolean_type_node));
2247 endlink = void_list_node;
2248 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2250 = build_function_type (ptr_type_node,
2251 tree_cons (NULL_TREE, ptr_type_node, endlink));
2253 input_location = save_loc;
2255 pedantic_lvalues = pedantic;
2257 make_fname_decl = c_make_fname_decl;
2258 start_fname_decls ();
2260 first_builtin_decl = global_scope->names;
2261 last_builtin_decl = global_scope->names_last;
2264 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2265 decl, NAME is the initialization string and TYPE_DEP indicates whether
2266 NAME depended on the type of the function. As we don't yet implement
2267 delayed emission of static data, we mark the decl as emitted
2268 so it is not placed in the output. Anything using it must therefore pull
2269 out the STRING_CST initializer directly. FIXME. */
2272 c_make_fname_decl (tree id, int type_dep)
2274 const char *name = fname_as_string (type_dep);
2275 tree decl, type, init;
2276 size_t length = strlen (name);
2278 type = build_array_type
2279 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2280 build_index_type (size_int (length)));
2282 decl = build_decl (VAR_DECL, id, type);
2284 TREE_STATIC (decl) = 1;
2285 TREE_READONLY (decl) = 1;
2286 DECL_ARTIFICIAL (decl) = 1;
2288 init = build_string (length + 1, name);
2289 TREE_TYPE (init) = type;
2290 DECL_INITIAL (decl) = init;
2292 TREE_USED (decl) = 1;
2294 if (current_function_decl)
2296 DECL_CONTEXT (decl) = current_function_decl;
2297 IDENTIFIER_SYMBOL_VALUE (id) = decl;
2298 SCOPE_LIST_APPEND (current_function_scope, names, decl);
2301 finish_decl (decl, init, NULL_TREE);
2306 /* Return a definition for a builtin function named NAME and whose data type
2307 is TYPE. TYPE should be a function type with argument types.
2308 FUNCTION_CODE tells later passes how to compile calls to this function.
2309 See tree.h for its possible values.
2311 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2312 the name to be called if we can't opencode the function. If
2313 ATTRS is nonzero, use that for the function's attribute list. */
2316 builtin_function (const char *name, tree type, int function_code,
2317 enum built_in_class class, const char *library_name,
2320 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2321 DECL_EXTERNAL (decl) = 1;
2322 TREE_PUBLIC (decl) = 1;
2324 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2325 make_decl_rtl (decl, NULL);
2327 DECL_BUILT_IN_CLASS (decl) = class;
2328 DECL_FUNCTION_CODE (decl) = function_code;
2330 /* Warn if a function in the namespace for users
2331 is used without an occasion to consider it declared. */
2332 if (name[0] != '_' || name[1] != '_')
2333 C_DECL_INVISIBLE (decl) = 1;
2335 /* Possibly apply some default attributes to this built-in function. */
2337 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2339 decl_attributes (&decl, NULL_TREE, 0);
2344 /* Called when a declaration is seen that contains no names to declare.
2345 If its type is a reference to a structure, union or enum inherited
2346 from a containing scope, shadow that tag name for the current scope
2347 with a forward reference.
2348 If its type defines a new named structure or union
2349 or defines an enum, it is valid but we need not do anything here.
2350 Otherwise, it is an error. */
2353 shadow_tag (tree declspecs)
2355 shadow_tag_warned (declspecs, 0);
2359 shadow_tag_warned (tree declspecs, int warned)
2362 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2369 pending_invalid_xref = 0;
2371 /* Remove the attributes from declspecs, since they will confuse the
2373 split_specs_attrs (declspecs, &specs, &attrs);
2375 for (link = specs; link; link = TREE_CHAIN (link))
2377 tree value = TREE_VALUE (link);
2378 enum tree_code code = TREE_CODE (value);
2380 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2381 /* Used to test also that TYPE_SIZE (value) != 0.
2382 That caused warning for `struct foo;' at top level in the file. */
2384 tree name = TYPE_NAME (value);
2391 if (warned != 1 && code != ENUMERAL_TYPE)
2392 /* Empty unnamed enum OK */
2394 pedwarn ("unnamed struct/union that defines no instances");
2400 t = lookup_tag (code, name, 1);
2404 t = make_node (code);
2411 if (!warned && ! in_system_header)
2413 warning ("useless keyword or type name in empty declaration");
2420 error ("two types specified in one empty declaration");
2425 pedwarn ("empty declaration");
2429 /* Construct an array declarator. EXPR is the expression inside [], or
2430 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2431 to the pointer to which a parameter array is converted). STATIC_P is
2432 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2433 is nonzero is the array is [*], a VLA of unspecified length which is
2434 nevertheless a complete type (not currently implemented by GCC),
2435 zero otherwise. The declarator is constructed as an ARRAY_REF
2436 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2437 left of the [] (filled by in set_array_declarator_type) and operand 1
2438 is the expression inside; whose TREE_TYPE is the type qualifiers and
2439 which has TREE_STATIC set if "static" is used. */
2442 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2445 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2446 TREE_TYPE (decl) = quals;
2447 TREE_STATIC (decl) = (static_p ? 1 : 0);
2448 if (pedantic && !flag_isoc99)
2450 if (static_p || quals != NULL_TREE)
2451 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2453 pedwarn ("ISO C90 does not support `[*]' array declarators");
2456 warning ("GCC does not yet properly implement `[*]' array declarators");
2460 /* Set the type of an array declarator. DECL is the declarator, as
2461 constructed by build_array_declarator; TYPE is what appears on the left
2462 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2463 abstract declarator, zero otherwise; this is used to reject static and
2464 type qualifiers in abstract declarators, where they are not in the
2468 set_array_declarator_type (tree decl, tree type, int abstract_p)
2470 TREE_OPERAND (decl, 0) = type;
2471 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2472 error ("static or type qualifiers in abstract declarator");
2476 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2479 groktypename (tree typename)
2483 if (TREE_CODE (typename) != TREE_LIST)
2486 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2488 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
2490 /* Apply attributes. */
2491 decl_attributes (&typename, attrs, 0);
2496 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2499 groktypename_in_parm_context (tree typename)
2501 if (TREE_CODE (typename) != TREE_LIST)
2503 return grokdeclarator (TREE_VALUE (typename),
2504 TREE_PURPOSE (typename),
2508 /* Decode a declarator in an ordinary declaration or data definition.
2509 This is called as soon as the type information and variable name
2510 have been parsed, before parsing the initializer if any.
2511 Here we create the ..._DECL node, fill in its type,
2512 and put it on the list of decls for the current context.
2513 The ..._DECL node is returned as the value.
2515 Exception: for arrays where the length is not specified,
2516 the type is left null, to be filled in by `finish_decl'.
2518 Function definitions do not come here; they go to start_function
2519 instead. However, external and forward declarations of functions
2520 do go through here. Structure field declarations are done by
2521 grokfield and not through here. */
2524 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2529 /* An object declared as __attribute__((deprecated)) suppresses
2530 warnings of uses of other deprecated items. */
2531 if (lookup_attribute ("deprecated", attributes))
2532 deprecated_state = DEPRECATED_SUPPRESS;
2534 decl = grokdeclarator (declarator, declspecs,
2535 NORMAL, initialized);
2537 deprecated_state = DEPRECATED_NORMAL;
2539 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2540 && MAIN_NAME_P (DECL_NAME (decl)))
2541 warning ("%J'%D' is usually a function", decl, decl);
2544 /* Is it valid for this decl to have an initializer at all?
2545 If not, set INITIALIZED to zero, which will indirectly
2546 tell `finish_decl' to ignore the initializer once it is parsed. */
2547 switch (TREE_CODE (decl))
2550 error ("typedef `%s' is initialized (use __typeof__ instead)",
2551 IDENTIFIER_POINTER (DECL_NAME (decl)));
2556 error ("function `%s' is initialized like a variable",
2557 IDENTIFIER_POINTER (DECL_NAME (decl)));
2562 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2563 error ("parameter `%s' is initialized",
2564 IDENTIFIER_POINTER (DECL_NAME (decl)));
2569 /* Don't allow initializations for incomplete types
2570 except for arrays which might be completed by the initialization. */
2572 /* This can happen if the array size is an undefined macro. We already
2573 gave a warning, so we don't need another one. */
2574 if (TREE_TYPE (decl) == error_mark_node)
2576 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2578 /* A complete type is ok if size is fixed. */
2580 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2581 || C_DECL_VARIABLE_SIZE (decl))
2583 error ("variable-sized object may not be initialized");
2587 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2589 error ("variable `%s' has initializer but incomplete type",
2590 IDENTIFIER_POINTER (DECL_NAME (decl)));
2593 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2595 error ("elements of array `%s' have incomplete type",
2596 IDENTIFIER_POINTER (DECL_NAME (decl)));
2603 DECL_EXTERNAL (decl) = 0;
2604 if (current_scope == global_scope)
2605 TREE_STATIC (decl) = 1;
2607 /* Tell `pushdecl' this is an initialized decl
2608 even though we don't yet have the initializer expression.
2609 Also tell `finish_decl' it may store the real initializer. */
2610 DECL_INITIAL (decl) = error_mark_node;
2613 /* If this is a function declaration, write a record describing it to the
2614 prototypes file (if requested). */
2616 if (TREE_CODE (decl) == FUNCTION_DECL)
2617 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2619 /* ANSI specifies that a tentative definition which is not merged with
2620 a non-tentative definition behaves exactly like a definition with an
2621 initializer equal to zero. (Section 3.7.2)
2623 -fno-common gives strict ANSI behavior, though this tends to break
2624 a large body of code that grew up without this rule.
2626 Thread-local variables are never common, since there's no entrenched
2627 body of code to break, and it allows more efficient variable references
2628 in the presence of dynamic linking. */
2630 if (TREE_CODE (decl) == VAR_DECL
2632 && TREE_PUBLIC (decl)
2633 && !DECL_THREAD_LOCAL (decl)
2635 DECL_COMMON (decl) = 1;
2637 /* Set attributes here so if duplicate decl, will have proper attributes. */
2638 decl_attributes (&decl, attributes, 0);
2640 if (TREE_CODE (decl) == FUNCTION_DECL
2641 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2643 tree ce = declarator;
2645 if (TREE_CODE (ce) == INDIRECT_REF)
2646 ce = TREE_OPERAND (declarator, 0);
2647 if (TREE_CODE (ce) == CALL_EXPR)
2649 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2650 for (; args; args = TREE_CHAIN (args))
2652 tree type = TREE_TYPE (args);
2653 if (INTEGRAL_TYPE_P (type)
2654 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2655 DECL_ARG_TYPE (args) = integer_type_node;
2660 if (TREE_CODE (decl) == FUNCTION_DECL
2661 && DECL_DECLARED_INLINE_P (decl)
2662 && DECL_UNINLINABLE (decl)
2663 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2664 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2666 /* Add this decl to the current scope.
2667 TEM may equal DECL or it may be a previous decl of the same name. */
2668 tem = pushdecl (decl);
2670 /* For a local variable, define the RTL now. */
2671 if (current_scope != global_scope
2672 /* But not if this is a duplicate decl
2673 and we preserved the rtl from the previous one
2674 (which may or may not happen). */
2675 && !DECL_RTL_SET_P (tem)
2676 && DECL_FILE_SCOPE_P (tem))
2678 if (TREE_TYPE (tem) != error_mark_node
2679 && (COMPLETE_TYPE_P (TREE_TYPE (tem))
2680 || (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2681 && DECL_INITIAL (tem) != 0)))
2688 /* Finish processing of a declaration;
2689 install its initial value.
2690 If the length of an array type is not known before,
2691 it must be determined now, from the initial value, or it is an error. */
2694 finish_decl (tree decl, tree init, tree asmspec_tree)
2696 tree type = TREE_TYPE (decl);
2697 int was_incomplete = (DECL_SIZE (decl) == 0);
2698 const char *asmspec = 0;
2700 /* If a name was specified, get the string. */
2701 if (current_scope == global_scope)
2702 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2704 asmspec = TREE_STRING_POINTER (asmspec_tree);
2706 /* If `start_decl' didn't like having an initialization, ignore it now. */
2707 if (init != 0 && DECL_INITIAL (decl) == 0)
2710 /* Don't crash if parm is initialized. */
2711 if (TREE_CODE (decl) == PARM_DECL)
2715 store_init_value (decl, init);
2717 /* Deduce size of array from initialization, if not already known */
2718 if (TREE_CODE (type) == ARRAY_TYPE
2719 && TYPE_DOMAIN (type) == 0
2720 && TREE_CODE (decl) != TYPE_DECL)
2723 = (TREE_STATIC (decl)
2724 /* Even if pedantic, an external linkage array
2725 may have incomplete type at first. */
2726 ? pedantic && !TREE_PUBLIC (decl)
2727 : !DECL_EXTERNAL (decl));
2729 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2731 /* Get the completed type made by complete_array_type. */
2732 type = TREE_TYPE (decl);
2735 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2737 else if (failure == 2)
2740 error ("%Jarray size missing in '%D'", decl, decl);
2741 /* If a `static' var's size isn't known,
2742 make it extern as well as static, so it does not get
2744 If it is not `static', then do not mark extern;
2745 finish_incomplete_decl will give it a default size
2746 and it will get allocated. */
2747 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2748 DECL_EXTERNAL (decl) = 1;
2751 /* TYPE_MAX_VALUE is always one less than the number of elements
2752 in the array, because we start counting at zero. Therefore,
2753 warn only if the value is less than zero. */
2754 else if (pedantic && TYPE_DOMAIN (type) != 0
2755 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2756 error ("%Jzero or negative size array '%D'", decl, decl);
2758 layout_decl (decl, 0);
2761 if (TREE_CODE (decl) == VAR_DECL)
2763 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2764 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2765 layout_decl (decl, 0);
2767 if (DECL_SIZE (decl) == 0
2768 /* Don't give an error if we already gave one earlier. */
2769 && TREE_TYPE (decl) != error_mark_node
2770 && (TREE_STATIC (decl)
2772 /* A static variable with an incomplete type
2773 is an error if it is initialized.
2774 Also if it is not file scope.
2775 Otherwise, let it through, but if it is not `extern'
2776 then it may cause an error message later. */
2777 (DECL_INITIAL (decl) != 0
2778 || !DECL_FILE_SCOPE_P (decl))
2780 /* An automatic variable with an incomplete type
2782 !DECL_EXTERNAL (decl)))
2784 error ("%Jstorage size of '%D' isn't known", decl, decl);
2785 TREE_TYPE (decl) = error_mark_node;
2788 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2789 && DECL_SIZE (decl) != 0)
2791 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2792 constant_expression_warning (DECL_SIZE (decl));
2794 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2797 if (TREE_USED (type))
2798 TREE_USED (decl) = 1;
2801 /* If this is a function and an assembler name is specified, reset DECL_RTL
2802 so we can give it its new name. Also, update built_in_decls if it
2803 was a normal built-in. */
2804 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2806 /* ASMSPEC is given, and not the name of a register. Mark the
2807 name with a star so assemble_name won't munge it. */
2808 char *starred = alloca (strlen (asmspec) + 2);
2810 strcpy (starred + 1, asmspec);
2812 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2814 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2815 SET_DECL_RTL (builtin, NULL_RTX);
2816 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2817 #ifdef TARGET_MEM_FUNCTIONS
2818 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2819 init_block_move_fn (starred);
2820 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2821 init_block_clear_fn (starred);
2823 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2824 init_block_move_fn (starred);
2825 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2826 init_block_clear_fn (starred);
2829 SET_DECL_RTL (decl, NULL_RTX);
2830 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (starred));
2833 /* If #pragma weak was used, mark the decl weak now. */
2834 if (current_scope == global_scope)
2835 maybe_apply_pragma_weak (decl);
2837 /* Output the assembler code and/or RTL code for variables and functions,
2838 unless the type is an undefined structure or union.
2839 If not, it will get done when the type is completed. */
2841 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2843 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2844 if (c_dialect_objc ())
2845 objc_check_decl (decl);
2847 if (DECL_FILE_SCOPE_P (decl))
2849 if (DECL_INITIAL (decl) == NULL_TREE
2850 || DECL_INITIAL (decl) == error_mark_node)
2851 /* Don't output anything
2852 when a tentative file-scope definition is seen.
2853 But at end of compilation, do output code for them. */
2854 DECL_DEFER_OUTPUT (decl) = 1;
2855 rest_of_decl_compilation (decl, asmspec, true, 0);
2859 /* This is a local variable. If there is an ASMSPEC, the
2860 user has requested that we handle it specially. */
2863 /* In conjunction with an ASMSPEC, the `register'
2864 keyword indicates that we should place the variable
2865 in a particular register. */
2866 if (DECL_REGISTER (decl))
2867 DECL_C_HARD_REGISTER (decl) = 1;
2869 /* If this is not a static variable, issue a warning.
2870 It doesn't make any sense to give an ASMSPEC for an
2871 ordinary, non-register local variable. Historically,
2872 GCC has accepted -- but ignored -- the ASMSPEC in
2874 if (TREE_CODE (decl) == VAR_DECL
2875 && !DECL_REGISTER (decl)
2876 && !TREE_STATIC (decl))
2877 warning ("%Jignoring asm-specifier for non-static local "
2878 "variable '%D'", decl, decl);
2880 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
2883 if (TREE_CODE (decl) != FUNCTION_DECL)
2884 add_decl_stmt (decl);
2887 if (!DECL_FILE_SCOPE_P (decl))
2889 /* Recompute the RTL of a local array now
2890 if it used to be an incomplete type. */
2892 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2894 /* If we used it already as memory, it must stay in memory. */
2895 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2896 /* If it's still incomplete now, no init will save it. */
2897 if (DECL_SIZE (decl) == 0)
2898 DECL_INITIAL (decl) = 0;
2903 /* If this was marked 'used', be sure it will be output. */
2904 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2905 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2907 if (TREE_CODE (decl) == TYPE_DECL)
2909 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2910 if (c_dialect_objc ())
2911 objc_check_decl (decl);
2912 rest_of_decl_compilation (decl, NULL, DECL_FILE_SCOPE_P (decl), 0);
2915 /* At the end of a declaration, throw away any variable type sizes
2916 of types defined inside that declaration. There is no use
2917 computing them in the following function definition. */
2918 if (current_scope == global_scope)
2919 get_pending_sizes ();
2921 /* Install a cleanup (aka destructor) if one was given. */
2922 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2924 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2927 static bool eh_initialized_p;
2929 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2930 tree cleanup_decl = lookup_name (cleanup_id);
2933 /* Build "cleanup(&decl)" for the destructor. */
2934 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2935 cleanup = build_tree_list (NULL_TREE, cleanup);
2936 cleanup = build_function_call (cleanup_decl, cleanup);
2938 /* Don't warn about decl unused; the cleanup uses it. */
2939 TREE_USED (decl) = 1;
2941 /* Initialize EH, if we've been told to do so. */
2942 if (flag_exceptions && !eh_initialized_p)
2944 eh_initialized_p = true;
2945 eh_personality_libfunc
2946 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
2947 ? "__gcc_personality_sj0"
2948 : "__gcc_personality_v0");
2949 using_eh_for_cleanups ();
2952 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
2957 /* Given a parsed parameter declaration, decode it into a PARM_DECL
2958 and push that on the current scope. */
2961 push_parm_decl (tree parm)
2965 /* Don't attempt to expand sizes while parsing this decl.
2966 (We can get here with i_s_e 1 somehow from Objective-C.) */
2967 int save_immediate_size_expand = immediate_size_expand;
2968 immediate_size_expand = 0;
2970 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
2971 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
2972 decl_attributes (&decl, TREE_VALUE (parm), 0);
2974 decl = pushdecl (decl);
2976 finish_decl (decl, NULL_TREE, NULL_TREE);
2978 immediate_size_expand = save_immediate_size_expand;
2981 /* Mark all the parameter declarations to date as forward decls,
2982 shift them to the variables list, and reset the parameters list.
2983 Also diagnose use of this extension. */
2986 mark_forward_parm_decls (void)
2990 if (pedantic && !current_scope->warned_forward_parm_decls)
2992 pedwarn ("ISO C forbids forward parameter declarations");
2993 current_scope->warned_forward_parm_decls = true;
2996 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
2997 TREE_ASM_WRITTEN (parm) = 1;
2999 SCOPE_LIST_CONCAT (current_scope, names, current_scope, parms);
3000 current_scope->parms = 0;
3001 current_scope->parms_last = 0;
3004 static GTY(()) int compound_literal_number;
3006 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3007 literal, which may be an incomplete array type completed by the
3008 initializer; INIT is a CONSTRUCTOR that initializes the compound
3012 build_compound_literal (tree type, tree init)
3014 /* We do not use start_decl here because we have a type, not a declarator;
3015 and do not use finish_decl because the decl should be stored inside
3016 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3017 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3020 DECL_EXTERNAL (decl) = 0;
3021 TREE_PUBLIC (decl) = 0;
3022 TREE_STATIC (decl) = (current_scope == global_scope);
3023 DECL_CONTEXT (decl) = current_function_decl;
3024 TREE_USED (decl) = 1;
3025 TREE_TYPE (decl) = type;
3026 TREE_READONLY (decl) = TREE_READONLY (type);
3027 store_init_value (decl, init);
3029 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3031 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3036 type = TREE_TYPE (decl);
3037 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3038 return error_mark_node;
3040 stmt = build_stmt (DECL_STMT, decl);
3041 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3042 TREE_SIDE_EFFECTS (complit) = 1;
3044 layout_decl (decl, 0);
3046 if (TREE_STATIC (decl))
3048 /* This decl needs a name for the assembler output. We also need
3049 a unique suffix to be added to the name. */
3052 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3053 compound_literal_number);
3054 compound_literal_number++;
3055 DECL_NAME (decl) = get_identifier (name);
3056 DECL_DEFER_OUTPUT (decl) = 1;
3057 DECL_COMDAT (decl) = 1;
3058 DECL_ARTIFICIAL (decl) = 1;
3060 rest_of_decl_compilation (decl, NULL, 1, 0);
3066 /* Make TYPE a complete type based on INITIAL_VALUE.
3067 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3068 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3071 complete_array_type (tree type, tree initial_value, int do_default)
3073 tree maxindex = NULL_TREE;
3078 /* Note MAXINDEX is really the maximum index,
3079 one less than the size. */
3080 if (TREE_CODE (initial_value) == STRING_CST)
3083 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3084 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3087 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3089 tree elts = CONSTRUCTOR_ELTS (initial_value);
3090 maxindex = build_int_2 (-1, -1);
3091 for (; elts; elts = TREE_CHAIN (elts))
3093 if (TREE_PURPOSE (elts))
3094 maxindex = TREE_PURPOSE (elts);
3096 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3097 maxindex, integer_one_node));
3099 maxindex = copy_node (maxindex);
3103 /* Make an error message unless that happened already. */
3104 if (initial_value != error_mark_node)
3107 /* Prevent further error messages. */
3108 maxindex = build_int_2 (0, 0);
3115 maxindex = build_int_2 (0, 0);
3121 TYPE_DOMAIN (type) = build_index_type (maxindex);
3122 if (!TREE_TYPE (maxindex))
3123 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3126 /* Lay out the type now that we can get the real answer. */
3133 /* Determine whether TYPE is a structure with a flexible array member,
3134 or a union containing such a structure (possibly recursively). */
3137 flexible_array_type_p (tree type)
3140 switch (TREE_CODE (type))
3143 x = TYPE_FIELDS (type);
3146 while (TREE_CHAIN (x) != NULL_TREE)
3148 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3149 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3150 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3151 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3155 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3157 if (flexible_array_type_p (TREE_TYPE (x)))
3166 /* Given declspecs and a declarator,
3167 determine the name and type of the object declared
3168 and construct a ..._DECL node for it.
3169 (In one case we can return a ..._TYPE node instead.
3170 For invalid input we sometimes return 0.)
3172 DECLSPECS is a chain of tree_list nodes whose value fields
3173 are the storage classes and type specifiers.
3175 DECL_CONTEXT says which syntactic context this declaration is in:
3176 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3177 FUNCDEF for a function definition. Like NORMAL but a few different
3178 error messages in each case. Return value may be zero meaning
3179 this definition is too screwy to try to parse.
3180 PARM for a parameter declaration (either within a function prototype
3181 or before a function body). Make a PARM_DECL, or return void_type_node.
3182 TYPENAME if for a typename (in a cast or sizeof).
3183 Don't make a DECL node; just return the ..._TYPE node.
3184 FIELD for a struct or union field; make a FIELD_DECL.
3185 BITFIELD for a field with specified width.
3186 INITIALIZED is 1 if the decl has an initializer.
3188 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3189 It may also be so in the PARM case, for a prototype where the
3190 argument type is specified but not the name.
3192 This function is where the complicated C meanings of `static'
3193 and `extern' are interpreted. */
3196 grokdeclarator (tree declarator, tree declspecs,
3197 enum decl_context decl_context, int initialized)
3201 tree type = NULL_TREE;
3206 int type_quals = TYPE_UNQUALIFIED;
3208 int explicit_int = 0;
3209 int explicit_char = 0;
3210 int defaulted_int = 0;
3211 tree typedef_decl = 0;
3213 tree typedef_type = 0;
3214 int funcdef_flag = 0;
3215 enum tree_code innermost_code = ERROR_MARK;
3217 int size_varies = 0;
3218 tree decl_attr = NULL_TREE;
3219 tree array_ptr_quals = NULL_TREE;
3220 int array_parm_static = 0;
3221 tree returned_attrs = NULL_TREE;
3223 if (decl_context == BITFIELD)
3224 bitfield = 1, decl_context = FIELD;
3226 if (decl_context == FUNCDEF)
3227 funcdef_flag = 1, decl_context = NORMAL;
3229 /* Look inside a declarator for the name being declared
3230 and get it as a string, for an error message. */
3232 tree decl = declarator;
3236 switch (TREE_CODE (decl))
3241 innermost_code = TREE_CODE (decl);
3242 decl = TREE_OPERAND (decl, 0);
3246 decl = TREE_VALUE (decl);
3249 case IDENTIFIER_NODE:
3250 name = IDENTIFIER_POINTER (decl);
3261 /* A function definition's declarator must have the form of
3262 a function declarator. */
3264 if (funcdef_flag && innermost_code != CALL_EXPR)
3267 /* If this looks like a function definition, make it one,
3268 even if it occurs where parms are expected.
3269 Then store_parm_decls will reject it and not use it as a parm. */
3270 if (decl_context == NORMAL && !funcdef_flag
3271 && current_scope->parm_flag)
3272 decl_context = PARM;
3274 /* Look through the decl specs and record which ones appear.
3275 Some typespecs are defined as built-in typenames.
3276 Others, the ones that are modifiers of other types,
3277 are represented by bits in SPECBITS: set the bits for
3278 the modifiers that appear. Storage class keywords are also in SPECBITS.
3280 If there is a typedef name or a type, store the type in TYPE.
3281 This includes builtin typedefs such as `int'.
3283 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3284 and did not come from a user typedef.
3286 Set LONGLONG if `long' is mentioned twice. */
3288 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3290 tree id = TREE_VALUE (spec);
3292 /* If the entire declaration is itself tagged as deprecated then
3293 suppress reports of deprecated items. */
3294 if (id && TREE_DEPRECATED (id))
3296 if (deprecated_state != DEPRECATED_SUPPRESS)
3297 warn_deprecated_use (id);
3300 if (id == ridpointers[(int) RID_INT])
3302 if (id == ridpointers[(int) RID_CHAR])
3305 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3307 enum rid i = C_RID_CODE (id);
3308 if ((int) i <= (int) RID_LAST_MODIFIER)
3310 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3313 error ("`long long long' is too long for GCC");
3316 if (pedantic && !flag_isoc99 && ! in_system_header
3318 pedwarn ("ISO C90 does not support `long long'");
3322 else if (specbits & (1 << (int) i))
3324 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3327 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3330 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3333 /* Diagnose "__thread extern". Recall that this list
3334 is in the reverse order seen in the text. */
3336 && (specbits & (1 << (int) RID_EXTERN
3337 | 1 << (int) RID_STATIC)))
3339 if (specbits & 1 << (int) RID_EXTERN)
3340 error ("`__thread' before `extern'");
3342 error ("`__thread' before `static'");
3345 specbits |= 1 << (int) i;
3350 error ("two or more data types in declaration of `%s'", name);
3351 /* Actual typedefs come to us as TYPE_DECL nodes. */
3352 else if (TREE_CODE (id) == TYPE_DECL)
3354 if (TREE_TYPE (id) == error_mark_node)
3355 ; /* Allow the type to default to int to avoid cascading errors. */
3358 type = TREE_TYPE (id);
3359 decl_attr = DECL_ATTRIBUTES (id);
3363 /* Built-in types come as identifiers. */
3364 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3366 tree t = lookup_name (id);
3367 if (TREE_TYPE (t) == error_mark_node)
3369 else if (!t || TREE_CODE (t) != TYPE_DECL)
3370 error ("`%s' fails to be a typedef or built in type",
3371 IDENTIFIER_POINTER (id));
3374 type = TREE_TYPE (t);
3378 else if (TREE_CODE (id) != ERROR_MARK)
3385 typedef_type = type;
3387 size_varies = C_TYPE_VARIABLE_SIZE (type);
3389 /* No type at all: default to `int', and set DEFAULTED_INT
3390 because it was not a user-defined typedef. */
3394 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3395 | (1 << (int) RID_SIGNED)
3396 | (1 << (int) RID_UNSIGNED)
3397 | (1 << (int) RID_COMPLEX))))
3398 /* Don't warn about typedef foo = bar. */
3399 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3400 && ! in_system_header)
3402 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3403 and this is a function, or if -Wimplicit; prefer the former
3404 warning since it is more explicit. */
3405 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3407 warn_about_return_type = 1;
3408 else if (warn_implicit_int || flag_isoc99)
3409 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3414 type = integer_type_node;
3417 /* Now process the modifiers that were specified
3418 and check for invalid combinations. */
3420 /* Long double is a special combination. */
3422 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3423 && TYPE_MAIN_VARIANT (type) == double_type_node)
3425 specbits &= ~(1 << (int) RID_LONG);
3426 type = long_double_type_node;
3429 /* Check all other uses of type modifiers. */
3431 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3432 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3436 if ((specbits & 1 << (int) RID_LONG)
3437 && (specbits & 1 << (int) RID_SHORT))
3438 error ("both long and short specified for `%s'", name);
3439 else if (((specbits & 1 << (int) RID_LONG)
3440 || (specbits & 1 << (int) RID_SHORT))
3442 error ("long or short specified with char for `%s'", name);
3443 else if (((specbits & 1 << (int) RID_LONG)
3444 || (specbits & 1 << (int) RID_SHORT))
3445 && TREE_CODE (type) == REAL_TYPE)
3447 static int already = 0;
3449 error ("long or short specified with floating type for `%s'", name);
3450 if (! already && ! pedantic)
3452 error ("the only valid combination is `long double'");
3456 else if ((specbits & 1 << (int) RID_SIGNED)
3457 && (specbits & 1 << (int) RID_UNSIGNED))
3458 error ("both signed and unsigned specified for `%s'", name);
3459 else if (TREE_CODE (type) != INTEGER_TYPE)
3460 error ("long, short, signed or unsigned invalid for `%s'", name);
3464 if (!explicit_int && !defaulted_int && !explicit_char)
3466 error ("long, short, signed or unsigned used invalidly for `%s'",
3472 /* Discard the type modifiers if they are invalid. */
3475 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3476 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3481 if ((specbits & (1 << (int) RID_COMPLEX))
3482 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3484 error ("complex invalid for `%s'", name);
3485 specbits &= ~(1 << (int) RID_COMPLEX);
3488 /* Decide whether an integer type is signed or not.
3489 Optionally treat bitfields as signed by default. */
3490 if (specbits & 1 << (int) RID_UNSIGNED
3491 || (bitfield && ! flag_signed_bitfields
3492 && (explicit_int || defaulted_int || explicit_char
3493 /* A typedef for plain `int' without `signed'
3494 can be controlled just like plain `int'. */
3495 || ! (typedef_decl != 0
3496 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3497 && TREE_CODE (type) != ENUMERAL_TYPE
3498 && !(specbits & 1 << (int) RID_SIGNED)))
3501 type = long_long_unsigned_type_node;
3502 else if (specbits & 1 << (int) RID_LONG)
3503 type = long_unsigned_type_node;
3504 else if (specbits & 1 << (int) RID_SHORT)
3505 type = short_unsigned_type_node;
3506 else if (type == char_type_node)
3507 type = unsigned_char_type_node;
3508 else if (typedef_decl)
3509 type = c_common_unsigned_type (type);
3511 type = unsigned_type_node;
3513 else if ((specbits & 1 << (int) RID_SIGNED)
3514 && type == char_type_node)
3515 type = signed_char_type_node;
3517 type = long_long_integer_type_node;
3518 else if (specbits & 1 << (int) RID_LONG)
3519 type = long_integer_type_node;
3520 else if (specbits & 1 << (int) RID_SHORT)
3521 type = short_integer_type_node;
3523 if (specbits & 1 << (int) RID_COMPLEX)
3525 if (pedantic && !flag_isoc99)
3526 pedwarn ("ISO C90 does not support complex types");
3527 /* If we just have "complex", it is equivalent to
3528 "complex double", but if any modifiers at all are specified it is
3529 the complex form of TYPE. E.g, "complex short" is
3530 "complex short int". */
3532 if (defaulted_int && ! longlong
3533 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3534 | (1 << (int) RID_SIGNED)
3535 | (1 << (int) RID_UNSIGNED))))
3538 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3539 type = complex_double_type_node;
3541 else if (type == integer_type_node)
3544 pedwarn ("ISO C does not support complex integer types");
3545 type = complex_integer_type_node;
3547 else if (type == float_type_node)
3548 type = complex_float_type_node;
3549 else if (type == double_type_node)
3550 type = complex_double_type_node;
3551 else if (type == long_double_type_node)
3552 type = complex_long_double_type_node;
3556 pedwarn ("ISO C does not support complex integer types");
3557 type = build_complex_type (type);
3561 /* Figure out the type qualifiers for the declaration. There are
3562 two ways a declaration can become qualified. One is something
3563 like `const int i' where the `const' is explicit. Another is
3564 something like `typedef const int CI; CI i' where the type of the
3565 declaration contains the `const'. */
3566 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3567 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
3568 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3569 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3570 if (constp > 1 && ! flag_isoc99)
3571 pedwarn ("duplicate `const'");
3572 if (restrictp > 1 && ! flag_isoc99)
3573 pedwarn ("duplicate `restrict'");
3574 if (volatilep > 1 && ! flag_isoc99)
3575 pedwarn ("duplicate `volatile'");
3576 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3577 type = TYPE_MAIN_VARIANT (type);
3578 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3579 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3580 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3582 /* Warn if two storage classes are given. Default to `auto'. */
3587 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3588 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3589 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3590 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3591 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3593 /* "static __thread" and "extern __thread" are allowed. */
3594 if ((specbits & (1 << (int) RID_THREAD
3595 | 1 << (int) RID_STATIC
3596 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3599 /* Warn about storage classes that are invalid for certain
3600 kinds of declarations (parameters, typenames, etc.). */
3603 error ("multiple storage classes in declaration of `%s'", name);
3604 else if (funcdef_flag
3606 & ((1 << (int) RID_REGISTER)
3607 | (1 << (int) RID_AUTO)
3608 | (1 << (int) RID_TYPEDEF)
3609 | (1 << (int) RID_THREAD))))
3611 if (specbits & 1 << (int) RID_AUTO
3612 && (pedantic || current_scope == global_scope))
3613 pedwarn ("function definition declared `auto'");
3614 if (specbits & 1 << (int) RID_REGISTER)
3615 error ("function definition declared `register'");
3616 if (specbits & 1 << (int) RID_TYPEDEF)
3617 error ("function definition declared `typedef'");
3618 if (specbits & 1 << (int) RID_THREAD)
3619 error ("function definition declared `__thread'");
3620 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3621 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3623 else if (decl_context != NORMAL && nclasses > 0)
3625 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3629 switch (decl_context)
3632 error ("storage class specified for structure field `%s'",
3636 error ("storage class specified for parameter `%s'", name);
3639 error ("storage class specified for typename");
3642 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3643 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3644 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3647 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3649 /* `extern' with initialization is invalid if not at file scope. */
3650 if (current_scope == global_scope)
3651 warning ("`%s' initialized and declared `extern'", name);
3653 error ("`%s' has both `extern' and initializer", name);
3655 else if (current_scope == global_scope)
3657 if (specbits & 1 << (int) RID_AUTO)
3658 error ("file-scope declaration of `%s' specifies `auto'", name);
3662 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3663 error ("nested function `%s' declared `extern'", name);
3664 else if ((specbits & (1 << (int) RID_THREAD
3665 | 1 << (int) RID_EXTERN
3666 | 1 << (int) RID_STATIC))
3667 == (1 << (int) RID_THREAD))
3669 error ("function-scope `%s' implicitly auto and declared `__thread'",
3671 specbits &= ~(1 << (int) RID_THREAD);
3676 /* Now figure out the structure of the declarator proper.
3677 Descend through it, creating more complex types, until we reach
3678 the declared identifier (or NULL_TREE, in an absolute declarator). */
3680 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3682 if (type == error_mark_node)
3684 declarator = TREE_OPERAND (declarator, 0);
3688 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3689 an INDIRECT_REF (for *...),
3690 a CALL_EXPR (for ...(...)),
3691 a TREE_LIST (for nested attributes),
3692 an identifier (for the name being declared)
3693 or a null pointer (for the place in an absolute declarator
3694 where the name was omitted).
3695 For the last two cases, we have just exited the loop.
3697 At this point, TYPE is the type of elements of an array,
3698 or for a function to return, or for a pointer to point to.
3699 After this sequence of ifs, TYPE is the type of the
3700 array or function or pointer, and DECLARATOR has had its
3701 outermost layer removed. */
3703 if (array_ptr_quals != NULL_TREE || array_parm_static)
3705 /* Only the innermost declarator (making a parameter be of
3706 array type which is converted to pointer type)
3707 may have static or type qualifiers. */
3708 error ("static or type qualifiers in non-parameter array declarator");
3709 array_ptr_quals = NULL_TREE;
3710 array_parm_static = 0;
3713 if (TREE_CODE (declarator) == TREE_LIST)
3715 /* We encode a declarator with embedded attributes using
3717 tree attrs = TREE_PURPOSE (declarator);
3720 declarator = TREE_VALUE (declarator);
3721 inner_decl = declarator;
3722 while (inner_decl != NULL_TREE
3723 && TREE_CODE (inner_decl) == TREE_LIST)
3724 inner_decl = TREE_VALUE (inner_decl);
3725 if (inner_decl == NULL_TREE
3726 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3727 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3728 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3729 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3730 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3731 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3732 returned_attrs = decl_attributes (&type,
3733 chainon (returned_attrs, attrs),
3736 else if (TREE_CODE (declarator) == ARRAY_REF)
3738 tree itype = NULL_TREE;
3739 tree size = TREE_OPERAND (declarator, 1);
3740 /* The index is a signed object `sizetype' bits wide. */
3741 tree index_type = c_common_signed_type (sizetype);
3743 array_ptr_quals = TREE_TYPE (declarator);
3744 array_parm_static = TREE_STATIC (declarator);
3746 declarator = TREE_OPERAND (declarator, 0);
3748 /* Check for some types that there cannot be arrays of. */
3750 if (VOID_TYPE_P (type))
3752 error ("declaration of `%s' as array of voids", name);
3753 type = error_mark_node;
3756 if (TREE_CODE (type) == FUNCTION_TYPE)
3758 error ("declaration of `%s' as array of functions", name);
3759 type = error_mark_node;
3762 if (pedantic && flexible_array_type_p (type))
3763 pedwarn ("invalid use of structure with flexible array member");
3765 if (size == error_mark_node)
3766 type = error_mark_node;
3768 if (type == error_mark_node)
3771 /* If size was specified, set ITYPE to a range-type for that size.
3772 Otherwise, ITYPE remains null. finish_decl may figure it out
3773 from an initial value. */
3777 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3778 STRIP_TYPE_NOPS (size);
3780 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3782 error ("size of array `%s' has non-integer type", name);
3783 size = integer_one_node;
3786 if (pedantic && integer_zerop (size))
3787 pedwarn ("ISO C forbids zero-size array `%s'", name);
3789 if (TREE_CODE (size) == INTEGER_CST)
3791 constant_expression_warning (size);
3792 if (tree_int_cst_sgn (size) < 0)
3794 error ("size of array `%s' is negative", name);
3795 size = integer_one_node;
3800 /* Make sure the array size remains visibly nonconstant
3801 even if it is (eg) a const variable with known value. */
3804 if (!flag_isoc99 && pedantic)
3806 if (TREE_CONSTANT (size))
3807 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3810 pedwarn ("ISO C90 forbids variable-size array `%s'",
3815 if (integer_zerop (size))
3817 /* A zero-length array cannot be represented with an
3818 unsigned index type, which is what we'll get with
3819 build_index_type. Create an open-ended range instead. */
3820 itype = build_range_type (sizetype, size, NULL_TREE);
3824 /* Compute the maximum valid index, that is, size - 1.
3825 Do the calculation in index_type, so that if it is
3826 a variable the computations will be done in the
3828 itype = fold (build (MINUS_EXPR, index_type,
3829 convert (index_type, size),
3830 convert (index_type, size_one_node)));
3832 /* If that overflowed, the array is too big.
3833 ??? While a size of INT_MAX+1 technically shouldn't
3834 cause an overflow (because we subtract 1), the overflow
3835 is recorded during the conversion to index_type, before
3836 the subtraction. Handling this case seems like an
3837 unnecessary complication. */
3838 if (TREE_OVERFLOW (itype))
3840 error ("size of array `%s' is too large", name);
3841 type = error_mark_node;
3847 /* We must be able to distinguish the
3848 SAVE_EXPR_CONTEXT for the variably-sized type
3849 so that we can set it correctly in
3850 set_save_expr_context. The convention is
3851 that all SAVE_EXPRs that need to be reset
3852 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3853 tree cfd = current_function_decl;
3854 if (decl_context == PARM)
3855 current_function_decl = NULL_TREE;
3856 itype = variable_size (itype);
3857 if (decl_context == PARM)
3858 current_function_decl = cfd;
3860 itype = build_index_type (itype);
3863 else if (decl_context == FIELD)
3865 if (pedantic && !flag_isoc99 && !in_system_header)
3866 pedwarn ("ISO C90 does not support flexible array members");
3868 /* ISO C99 Flexible array members are effectively identical
3869 to GCC's zero-length array extension. */
3870 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3873 /* If pedantic, complain about arrays of incomplete types. */
3875 if (pedantic && !COMPLETE_TYPE_P (type))
3876 pedwarn ("array type has incomplete element type");
3878 /* Build the array type itself, then merge any constancy or
3879 volatility into the target type. We must do it in this order
3880 to ensure that the TYPE_MAIN_VARIANT field of the array type
3881 is set correctly. */
3883 type = build_array_type (type, itype);
3885 type = c_build_qualified_type (type, type_quals);
3888 C_TYPE_VARIABLE_SIZE (type) = 1;
3890 /* The GCC extension for zero-length arrays differs from
3891 ISO flexible array members in that sizeof yields zero. */
3892 if (size && integer_zerop (size))
3895 TYPE_SIZE (type) = bitsize_zero_node;
3896 TYPE_SIZE_UNIT (type) = size_zero_node;
3898 if (decl_context != PARM
3899 && (array_ptr_quals != NULL_TREE || array_parm_static))
3901 error ("static or type qualifiers in non-parameter array declarator");
3902 array_ptr_quals = NULL_TREE;
3903 array_parm_static = 0;
3906 else if (TREE_CODE (declarator) == CALL_EXPR)
3910 /* Declaring a function type.
3911 Make sure we have a valid type for the function to return. */
3912 if (type == error_mark_node)
3917 /* Warn about some types functions can't return. */
3919 if (TREE_CODE (type) == FUNCTION_TYPE)
3921 error ("`%s' declared as function returning a function", name);
3922 type = integer_type_node;
3924 if (TREE_CODE (type) == ARRAY_TYPE)
3926 error ("`%s' declared as function returning an array", name);
3927 type = integer_type_node;
3930 /* Construct the function type and go to the next
3931 inner layer of declarator. */
3933 arg_types = grokparms (TREE_OPERAND (declarator, 1),
3935 /* Say it's a definition
3936 only for the CALL_EXPR
3937 closest to the identifier. */
3938 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
3939 /* Type qualifiers before the return type of the function
3940 qualify the return type, not the function type. */
3943 /* Type qualifiers on a function return type are normally
3944 permitted by the standard but have no effect, so give a
3945 warning at -Wextra. Qualifiers on a void return type have
3946 meaning as a GNU extension, and are banned on function
3947 definitions in ISO C. FIXME: strictly we shouldn't
3948 pedwarn for qualified void return types except on function
3949 definitions, but not doing so could lead to the undesirable
3950 state of a "volatile void" function return type not being
3951 warned about, and a use of the function being compiled
3952 with GNU semantics, with no diagnostics under -pedantic. */
3953 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
3954 pedwarn ("ISO C forbids qualified void function return type");
3955 else if (extra_warnings
3956 && !(VOID_TYPE_P (type)
3957 && type_quals == TYPE_QUAL_VOLATILE))
3958 warning ("type qualifiers ignored on function return type");
3960 type = c_build_qualified_type (type, type_quals);
3962 type_quals = TYPE_UNQUALIFIED;
3964 type = build_function_type (type, arg_types);
3965 declarator = TREE_OPERAND (declarator, 0);
3967 /* Set the TYPE_CONTEXTs for each tagged type which is local to
3968 the formal parameter list of this FUNCTION_TYPE to point to
3969 the FUNCTION_TYPE node itself. */
3974 for (link = last_function_parm_tags;
3976 link = TREE_CHAIN (link))
3977 TYPE_CONTEXT (TREE_VALUE (link)) = type;
3980 else if (TREE_CODE (declarator) == INDIRECT_REF)
3982 /* Merge any constancy or volatility into the target type
3985 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
3987 pedwarn ("ISO C forbids qualified function types");
3989 type = c_build_qualified_type (type, type_quals);
3990 type_quals = TYPE_UNQUALIFIED;
3993 type = build_pointer_type (type);
3995 /* Process a list of type modifier keywords
3996 (such as const or volatile) that were given inside the `*'. */
3998 if (TREE_TYPE (declarator))
4006 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4007 typemodlist = TREE_CHAIN (typemodlist))
4009 tree qualifier = TREE_VALUE (typemodlist);
4011 if (C_IS_RESERVED_WORD (qualifier))
4013 if (C_RID_CODE (qualifier) == RID_CONST)
4015 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4017 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4027 error ("invalid type modifier within pointer declarator");
4028 if (constp > 1 && ! flag_isoc99)
4029 pedwarn ("duplicate `const'");
4030 if (volatilep > 1 && ! flag_isoc99)
4031 pedwarn ("duplicate `volatile'");
4032 if (restrictp > 1 && ! flag_isoc99)
4033 pedwarn ("duplicate `restrict'");
4035 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4036 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4037 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4040 declarator = TREE_OPERAND (declarator, 0);
4047 /* Now TYPE has the actual type. */
4049 /* Did array size calculations overflow? */
4051 if (TREE_CODE (type) == ARRAY_TYPE
4052 && COMPLETE_TYPE_P (type)
4053 && TREE_OVERFLOW (TYPE_SIZE (type)))
4055 error ("size of array `%s' is too large", name);
4056 /* If we proceed with the array type as it is, we'll eventually
4057 crash in tree_low_cst(). */
4058 type = error_mark_node;
4061 /* If this is declaring a typedef name, return a TYPE_DECL. */
4063 if (specbits & (1 << (int) RID_TYPEDEF))
4066 /* Note that the grammar rejects storage classes
4067 in typenames, fields or parameters */
4068 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4070 pedwarn ("ISO C forbids qualified function types");
4072 type = c_build_qualified_type (type, type_quals);
4073 decl = build_decl (TYPE_DECL, declarator, type);
4074 if ((specbits & (1 << (int) RID_SIGNED))
4075 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4076 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4077 decl_attributes (&decl, returned_attrs, 0);
4081 /* Detect the case of an array type of unspecified size
4082 which came, as such, direct from a typedef name.
4083 We must copy the type, so that each identifier gets
4084 a distinct type, so that each identifier's size can be
4085 controlled separately by its own initializer. */
4087 if (type != 0 && typedef_type != 0
4088 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4089 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4091 type = build_array_type (TREE_TYPE (type), 0);
4093 C_TYPE_VARIABLE_SIZE (type) = 1;
4096 /* If this is a type name (such as, in a cast or sizeof),
4097 compute the type and return it now. */
4099 if (decl_context == TYPENAME)
4101 /* Note that the grammar rejects storage classes
4102 in typenames, fields or parameters */
4103 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4105 pedwarn ("ISO C forbids const or volatile function types");
4107 type = c_build_qualified_type (type, type_quals);
4108 decl_attributes (&type, returned_attrs, 0);
4112 /* Aside from typedefs and type names (handle above),
4113 `void' at top level (not within pointer)
4114 is allowed only in public variables.
4115 We don't complain about parms either, but that is because
4116 a better error message can be made later. */
4118 if (VOID_TYPE_P (type) && decl_context != PARM
4119 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4120 && ((specbits & (1 << (int) RID_EXTERN))
4121 || (current_scope == global_scope
4123 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4125 error ("variable or field `%s' declared void", name);
4126 type = integer_type_node;
4129 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4130 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4135 if (decl_context == PARM)
4137 tree type_as_written;
4140 /* A parameter declared as an array of T is really a pointer to T.
4141 One declared as a function is really a pointer to a function. */
4143 if (TREE_CODE (type) == ARRAY_TYPE)
4145 /* Transfer const-ness of array into that of type pointed to. */
4146 type = TREE_TYPE (type);
4148 type = c_build_qualified_type (type, type_quals);
4149 type = build_pointer_type (type);
4150 type_quals = TYPE_UNQUALIFIED;
4151 if (array_ptr_quals)
4153 tree new_ptr_quals, new_ptr_attrs;
4155 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4156 /* We don't yet implement attributes in this context. */
4157 if (new_ptr_attrs != NULL_TREE)
4158 warning ("attributes in parameter array declarator ignored");
4163 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4165 tree qualifier = TREE_VALUE (new_ptr_quals);
4167 if (C_IS_RESERVED_WORD (qualifier))
4169 if (C_RID_CODE (qualifier) == RID_CONST)
4171 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4173 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4183 error ("invalid type modifier within array declarator");
4185 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4186 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4187 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4191 else if (TREE_CODE (type) == FUNCTION_TYPE)
4193 if (pedantic && type_quals)
4194 pedwarn ("ISO C forbids qualified function types");
4196 type = c_build_qualified_type (type, type_quals);
4197 type = build_pointer_type (type);
4198 type_quals = TYPE_UNQUALIFIED;
4200 else if (type_quals)
4201 type = c_build_qualified_type (type, type_quals);
4203 type_as_written = type;
4205 decl = build_decl (PARM_DECL, declarator, type);
4207 C_DECL_VARIABLE_SIZE (decl) = 1;
4209 /* Compute the type actually passed in the parmlist,
4210 for the case where there is no prototype.
4211 (For example, shorts and chars are passed as ints.)
4212 When there is a prototype, this is overridden later. */
4214 if (type == error_mark_node)
4215 promoted_type = type;
4217 promoted_type = c_type_promotes_to (type);
4219 DECL_ARG_TYPE (decl) = promoted_type;
4220 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4222 else if (decl_context == FIELD)
4224 /* Structure field. It may not be a function. */
4226 if (TREE_CODE (type) == FUNCTION_TYPE)
4228 error ("field `%s' declared as a function", name);
4229 type = build_pointer_type (type);
4231 else if (TREE_CODE (type) != ERROR_MARK
4232 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4234 error ("field `%s' has incomplete type", name);
4235 type = error_mark_node;
4237 /* Move type qualifiers down to element of an array. */
4238 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4239 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4241 TYPE_DOMAIN (type));
4242 decl = build_decl (FIELD_DECL, declarator, type);
4243 DECL_NONADDRESSABLE_P (decl) = bitfield;
4246 C_DECL_VARIABLE_SIZE (decl) = 1;
4248 else if (TREE_CODE (type) == FUNCTION_TYPE)
4250 /* Every function declaration is "external"
4251 except for those which are inside a function body
4252 in which `auto' is used.
4253 That is a case not specified by ANSI C,
4254 and we use it for forward declarations for nested functions. */
4255 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4256 || current_scope == global_scope);
4258 if (specbits & (1 << (int) RID_AUTO)
4259 && (pedantic || current_scope == global_scope))
4260 pedwarn ("invalid storage class for function `%s'", name);
4261 if (specbits & (1 << (int) RID_REGISTER))
4262 error ("invalid storage class for function `%s'", name);
4263 if (specbits & (1 << (int) RID_THREAD))
4264 error ("invalid storage class for function `%s'", name);
4265 /* Function declaration not at file scope.
4266 Storage classes other than `extern' are not allowed
4267 and `extern' makes no difference. */
4268 if (current_scope != global_scope
4269 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4271 pedwarn ("invalid storage class for function `%s'", name);
4273 decl = build_decl (FUNCTION_DECL, declarator, type);
4274 decl = build_decl_attribute_variant (decl, decl_attr);
4276 DECL_LANG_SPECIFIC (decl)
4277 = ggc_alloc_cleared (sizeof (struct lang_decl));
4279 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4280 pedwarn ("ISO C forbids qualified function types");
4282 /* GNU C interprets a `volatile void' return type to indicate
4283 that the function does not return. */
4284 if ((type_quals & TYPE_QUAL_VOLATILE)
4285 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4286 warning ("`noreturn' function returns non-void value");
4289 DECL_EXTERNAL (decl) = 1;
4290 /* Record absence of global scope for `static' or `auto'. */
4292 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4295 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4297 /* Record presence of `inline', if it is reasonable. */
4298 if (MAIN_NAME_P (declarator))
4301 warning ("cannot inline function `main'");
4305 /* Record that the function is declared `inline'. */
4306 DECL_DECLARED_INLINE_P (decl) = 1;
4308 /* Do not mark bare declarations as DECL_INLINE. Doing so
4309 in the presence of multiple declarations can result in
4310 the abstract origin pointing between the declarations,
4311 which will confuse dwarf2out. */
4314 DECL_INLINE (decl) = 1;
4315 if (specbits & (1 << (int) RID_EXTERN))
4316 current_extern_inline = 1;
4319 /* If -finline-functions, assume it can be inlined. This does
4320 two things: let the function be deferred until it is actually
4321 needed, and let dwarf2 know that the function is inlinable. */
4322 else if (flag_inline_trees == 2 && initialized)
4323 DECL_INLINE (decl) = 1;
4327 /* It's a variable. */
4328 /* An uninitialized decl with `extern' is a reference. */
4329 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4331 /* Move type qualifiers down to element of an array. */
4332 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4334 int saved_align = TYPE_ALIGN(type);
4335 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4337 TYPE_DOMAIN (type));
4338 TYPE_ALIGN (type) = saved_align;
4340 else if (type_quals)
4341 type = c_build_qualified_type (type, type_quals);
4343 /* It is invalid to create an `extern' declaration for a
4344 variable if there is a global declaration that is
4346 if (extern_ref && current_scope != global_scope)
4350 global_decl = identifier_global_value (declarator);
4352 && TREE_CODE (global_decl) == VAR_DECL
4353 && !TREE_PUBLIC (global_decl))
4354 error ("variable previously declared `static' redeclared "
4358 decl = build_decl (VAR_DECL, declarator, type);
4360 C_DECL_VARIABLE_SIZE (decl) = 1;
4363 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4365 DECL_EXTERNAL (decl) = extern_ref;
4367 /* At file scope, the presence of a `static' or `register' storage
4368 class specifier, or the absence of all storage class specifiers
4369 makes this declaration a definition (perhaps tentative). Also,
4370 the absence of both `static' and `register' makes it public. */
4371 if (current_scope == global_scope)
4373 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4374 | (1 << (int) RID_REGISTER)));
4375 TREE_STATIC (decl) = !extern_ref;
4377 /* Not at file scope, only `static' makes a static definition. */
4380 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4381 TREE_PUBLIC (decl) = extern_ref;
4384 if (specbits & 1 << (int) RID_THREAD)
4386 if (targetm.have_tls)
4387 DECL_THREAD_LOCAL (decl) = 1;
4389 /* A mere warning is sure to result in improper semantics
4390 at runtime. Don't bother to allow this to compile. */
4391 error ("thread-local storage not supported for this target");
4395 /* Record `register' declaration for warnings on &
4396 and in case doing stupid register allocation. */
4398 if (specbits & (1 << (int) RID_REGISTER))
4399 DECL_REGISTER (decl) = 1;
4401 /* Record constancy and volatility. */
4402 c_apply_type_quals_to_decl (type_quals, decl);
4404 /* If a type has volatile components, it should be stored in memory.
4405 Otherwise, the fact that those components are volatile
4406 will be ignored, and would even crash the compiler. */
4407 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4408 c_mark_addressable (decl);
4410 #ifdef ENABLE_CHECKING
4411 /* This is the earliest point at which we might know the assembler
4412 name of a variable. Thus, if it's known before this, die horribly. */
4413 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4417 decl_attributes (&decl, returned_attrs, 0);
4423 /* Decode the parameter-list info for a function type or function definition.
4424 The argument is the value returned by `get_parm_info' (or made in parse.y
4425 if there is an identifier list instead of a parameter decl list).
4426 These two functions are separate because when a function returns
4427 or receives functions then each is called multiple times but the order
4428 of calls is different. The last call to `grokparms' is always the one
4429 that contains the formal parameter names of a function definition.
4431 Store in `last_function_parms' a chain of the decls of parms.
4432 Also store in `last_function_parm_tags' a chain of the struct, union,
4433 and enum tags declared among the parms.
4435 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4437 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4438 a mere declaration. A nonempty identifier-list gets an error message
4439 when FUNCDEF_FLAG is zero. */
4442 grokparms (tree parms_info, int funcdef_flag)
4444 tree first_parm = TREE_CHAIN (parms_info);
4446 last_function_parms = TREE_PURPOSE (parms_info);
4447 last_function_parm_tags = TREE_VALUE (parms_info);
4448 last_function_parm_others = TREE_TYPE (parms_info);
4450 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4451 && !in_system_header)
4452 warning ("function declaration isn't a prototype");
4455 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4458 pedwarn ("parameter names (without types) in function declaration");
4460 last_function_parms = first_parm;
4467 /* If the arg types are incomplete in a declaration,
4468 they must include undefined tags.
4469 These tags can never be defined in the scope of the declaration,
4470 so the types can never be completed,
4471 and no call can be compiled successfully. */
4473 for (parm = last_function_parms, typelt = first_parm;
4475 parm = TREE_CHAIN (parm))
4476 /* Skip over any enumeration constants declared here. */
4477 if (TREE_CODE (parm) == PARM_DECL)
4479 /* Barf if the parameter itself has an incomplete type. */
4480 tree type = TREE_VALUE (typelt);
4481 if (type == error_mark_node)
4483 if (!COMPLETE_TYPE_P (type))
4485 if (funcdef_flag && DECL_NAME (parm) != 0)
4486 error ("parameter `%s' has incomplete type",
4487 IDENTIFIER_POINTER (DECL_NAME (parm)));
4489 warning ("parameter has incomplete type");
4492 TREE_VALUE (typelt) = error_mark_node;
4493 TREE_TYPE (parm) = error_mark_node;
4496 typelt = TREE_CHAIN (typelt);
4503 /* Return a tree_list node with info on a parameter list just parsed.
4504 The TREE_PURPOSE is a list of decls of those parms.
4505 The TREE_VALUE is a list of structure, union and enum tags defined.
4506 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4507 The TREE_TYPE is a list of non-parameter decls which appeared with the
4509 This tree_list node is later fed to `grokparms'.
4511 VOID_AT_END nonzero means append `void' to the end of the type-list.
4512 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4515 get_parm_info (int void_at_end)
4517 tree decl, type, list;
4519 tree *last_type = &types;
4520 tree tags = current_scope->tags;
4521 tree parms = current_scope->parms;
4522 tree others = current_scope->names;
4523 static bool explained_incomplete_types = false;
4524 bool gave_void_only_once_err = false;
4526 /* Just "void" (and no ellipsis) is special. There are really no parms.
4527 But if the "void" is qualified (by "const" or "volatile"), or has a
4528 storage class specifier ("register"), then the behavior is undefined;
4529 issue an error. Typedefs for "void" are OK (see DR#157). */
4530 if (void_at_end && parms != 0
4531 && TREE_CHAIN (parms) == 0
4532 && VOID_TYPE_P (TREE_TYPE (parms))
4533 && !DECL_NAME (parms))
4535 if (TREE_THIS_VOLATILE (parms)
4536 || TREE_READONLY (parms)
4537 || DECL_REGISTER (parms))
4538 error ("\"void\" as only parameter may not be qualified");
4540 return tree_cons (0, 0, tree_cons (0, void_type_node, 0));
4543 /* Sanity check all of the parameter declarations. */
4544 for (decl = parms; decl; decl = TREE_CHAIN (decl))
4546 if (TREE_CODE (decl) != PARM_DECL)
4548 if (TREE_ASM_WRITTEN (decl))
4551 /* Since there is a prototype, args are passed in their
4552 declared types. The back end may override this. */
4553 type = TREE_TYPE (decl);
4554 DECL_ARG_TYPE (decl) = type;
4556 /* Check for (..., void, ...) and issue an error. */
4557 if (VOID_TYPE_P (type) && !DECL_NAME (decl) && !gave_void_only_once_err)
4559 error ("\"void\" must be the only parameter");
4560 gave_void_only_once_err = true;
4563 type = build_tree_list (0, type);
4565 last_type = &TREE_CHAIN (type);
4568 /* Check the list of non-parameter decls for any forward parm decls
4569 that never got real decls. */
4570 for (decl = others; decl; decl = TREE_CHAIN (decl))
4571 if (TREE_CODE (decl) == PARM_DECL)
4573 if (!TREE_ASM_WRITTEN (decl))
4576 error ("%Jparameter \"%D\" has just a forward declaration",
4580 /* Warn about any struct, union or enum tags defined within this
4581 list. The scope of such types is limited to this declaration,
4582 which is rarely if ever desirable (it's impossible to call such
4583 a function with type-correct arguments). */
4584 for (decl = tags; decl; decl = TREE_CHAIN (decl))
4586 enum tree_code code = TREE_CODE (TREE_VALUE (decl));
4587 const char *keyword;
4588 /* An anonymous union parm type is meaningful as a GNU extension.
4589 So don't warn for that. */
4590 if (code == UNION_TYPE && TREE_PURPOSE (decl) == 0 && !pedantic)
4593 /* The keyword should not be translated. */
4596 case RECORD_TYPE: keyword = "struct"; break;
4597 case UNION_TYPE: keyword = "union"; break;
4598 case ENUMERAL_TYPE: keyword = "enum"; break;
4602 if (TREE_PURPOSE (decl))
4603 /* The first %s will be one of 'struct', 'union', or 'enum'. */
4604 warning ("\"%s %s\" declared inside parameter list",
4605 keyword, IDENTIFIER_POINTER (TREE_PURPOSE (decl)));
4607 /* The %s will be one of 'struct', 'union', or 'enum'. */
4608 warning ("anonymous %s declared inside parameter list", keyword);
4610 if (! explained_incomplete_types)
4612 warning ("its scope is only this definition or declaration,"
4613 " which is probably not what you want");
4614 explained_incomplete_types = true;
4621 type = build_tree_list (0, void_type_node);
4625 list = tree_cons (parms, tags, types);
4626 TREE_TYPE (list) = others;
4630 /* Get the struct, enum or union (CODE says which) with tag NAME.
4631 Define the tag as a forward-reference if it is not defined. */
4634 xref_tag (enum tree_code code, tree name)
4636 /* If a cross reference is requested, look up the type
4637 already defined for this tag and return it. */
4639 tree ref = lookup_tag (code, name, 0);
4640 /* If this is the right type of tag, return what we found.
4641 (This reference will be shadowed by shadow_tag later if appropriate.)
4642 If this is the wrong type of tag, do not return it. If it was the
4643 wrong type in the same scope, we will have had an error
4644 message already; if in a different scope and declaring
4645 a name, pending_xref_error will give an error message; but if in a
4646 different scope and not declaring a name, this tag should
4647 shadow the previous declaration of a different type of tag, and
4648 this would not work properly if we return the reference found.
4649 (For example, with "struct foo" in an outer scope, "union foo;"
4650 must shadow that tag with a new one of union type.) */
4651 if (ref && TREE_CODE (ref) == code)
4654 /* If no such tag is yet defined, create a forward-reference node
4655 and record it as the "definition".
4656 When a real declaration of this type is found,
4657 the forward-reference will be altered into a real type. */
4659 ref = make_node (code);
4660 if (code == ENUMERAL_TYPE)
4662 /* Give the type a default layout like unsigned int
4663 to avoid crashing if it does not get defined. */
4664 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4665 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4666 TYPE_USER_ALIGN (ref) = 0;
4667 TREE_UNSIGNED (ref) = 1;
4668 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4669 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4670 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4673 pushtag (name, ref);
4678 /* Make sure that the tag NAME is defined *in the current scope*
4679 at least as a forward reference.
4680 CODE says which kind of tag NAME ought to be. */
4683 start_struct (enum tree_code code, tree name)
4685 /* If there is already a tag defined at this scope
4686 (as a forward reference), just return it. */
4691 ref = lookup_tag (code, name, 1);
4692 if (ref && TREE_CODE (ref) == code)
4694 if (TYPE_FIELDS (ref))
4696 if (code == UNION_TYPE)
4697 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4699 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4704 /* Otherwise create a forward-reference just so the tag is in scope. */
4706 ref = make_node (code);
4707 pushtag (name, ref);
4710 C_TYPE_BEING_DEFINED (ref) = 1;
4711 TYPE_PACKED (ref) = flag_pack_struct;
4715 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4716 of a structure component, returning a FIELD_DECL node.
4717 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4719 This is done during the parsing of the struct declaration.
4720 The FIELD_DECL nodes are chained together and the lot of them
4721 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4724 grokfield (tree declarator, tree declspecs, tree width)
4728 if (declarator == NULL_TREE && width == NULL_TREE)
4730 /* This is an unnamed decl.
4732 If we have something of the form "union { list } ;" then this
4733 is the anonymous union extension. Similarly for struct.
4735 If this is something of the form "struct foo;", then
4736 If MS extensions are enabled, this is handled as an
4738 Otherwise this is a forward declaration of a structure tag.
4740 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4741 If MS extensions are enabled and foo names a structure, then
4742 again this is an anonymous struct.
4743 Otherwise this is an error.
4745 Oh what a horrid tangled web we weave. I wonder if MS consciously
4746 took this from Plan 9 or if it was an accident of implementation
4747 that took root before someone noticed the bug... */
4749 tree type = TREE_VALUE (declspecs);
4751 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4752 type = TREE_TYPE (type);
4753 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4755 if (flag_ms_extensions)
4758 goto warn_unnamed_field;
4759 else if (TYPE_NAME (type) == NULL)
4762 goto warn_unnamed_field;
4767 warning ("declaration does not declare anything");
4772 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4774 finish_decl (value, NULL_TREE, NULL_TREE);
4775 DECL_INITIAL (value) = width;
4777 if (c_dialect_objc ())
4778 objc_check_decl (value);
4782 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4783 the list such that this does not present a problem later. */
4786 detect_field_duplicates (tree fieldlist)
4791 /* First, see if there are more than "a few" fields.
4792 This is trivially true if there are zero or one fields. */
4795 x = TREE_CHAIN (fieldlist);
4801 } while (timeout > 0 && x);
4803 /* If there were "few" fields, avoid the overhead of allocating
4804 a hash table. Instead just do the nested traversal thing. */
4807 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4810 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4811 if (DECL_NAME (y) == DECL_NAME (x))
4813 error ("%Jduplicate member '%D'", x, x);
4814 DECL_NAME (x) = NULL_TREE;
4820 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4823 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4824 if ((y = DECL_NAME (x)) != 0)
4826 slot = htab_find_slot (htab, y, INSERT);
4829 error ("%Jduplicate member '%D'", x, x);
4830 DECL_NAME (x) = NULL_TREE;
4839 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4840 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4841 ATTRIBUTES are attributes to be applied to the structure. */
4844 finish_struct (tree t, tree fieldlist, tree attributes)
4847 int toplevel = global_scope == current_scope;
4848 int saw_named_field;
4850 /* If this type was previously laid out as a forward reference,
4851 make sure we lay it out again. */
4855 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4857 /* Nameless union parm types are useful as GCC extension. */
4858 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4859 /* Otherwise, warn about any struct or union def. in parmlist. */
4860 if (in_parm_level_p ())
4863 pedwarn ("%s defined inside parms",
4864 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4866 warning ("%s defined inside parms",
4867 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4872 for (x = fieldlist; x; x = TREE_CHAIN (x))
4873 if (DECL_NAME (x) != 0)
4877 pedwarn ("%s has no %s",
4878 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4879 fieldlist ? _("named members") : _("members"));
4882 /* Install struct as DECL_CONTEXT of each field decl.
4883 Also process specified field sizes,m which is found in the DECL_INITIAL.
4884 Store 0 there, except for ": 0" fields (so we can find them
4885 and delete them, below). */
4887 saw_named_field = 0;
4888 for (x = fieldlist; x; x = TREE_CHAIN (x))
4890 DECL_CONTEXT (x) = t;
4891 DECL_PACKED (x) |= TYPE_PACKED (t);
4893 /* If any field is const, the structure type is pseudo-const. */
4894 if (TREE_READONLY (x))
4895 C_TYPE_FIELDS_READONLY (t) = 1;
4898 /* A field that is pseudo-const makes the structure likewise. */
4899 tree t1 = TREE_TYPE (x);
4900 while (TREE_CODE (t1) == ARRAY_TYPE)
4901 t1 = TREE_TYPE (t1);
4902 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4903 && C_TYPE_FIELDS_READONLY (t1))
4904 C_TYPE_FIELDS_READONLY (t) = 1;
4907 /* Any field that is volatile means variables of this type must be
4908 treated in some ways as volatile. */
4909 if (TREE_THIS_VOLATILE (x))
4910 C_TYPE_FIELDS_VOLATILE (t) = 1;
4912 /* Any field of nominal variable size implies structure is too. */
4913 if (C_DECL_VARIABLE_SIZE (x))
4914 C_TYPE_VARIABLE_SIZE (t) = 1;
4916 /* Detect invalid nested redefinition. */
4917 if (TREE_TYPE (x) == t)
4918 error ("nested redefinition of `%s'",
4919 IDENTIFIER_POINTER (TYPE_NAME (t)));
4921 /* Detect invalid bit-field size. */
4922 if (DECL_INITIAL (x))
4923 STRIP_NOPS (DECL_INITIAL (x));
4924 if (DECL_INITIAL (x))
4926 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
4927 constant_expression_warning (DECL_INITIAL (x));
4930 error ("%Jbit-field '%D' width not an integer constant", x, x);
4931 DECL_INITIAL (x) = NULL;
4935 /* Detect invalid bit-field type. */
4936 if (DECL_INITIAL (x)
4937 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
4938 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
4939 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
4941 error ("%Jbit-field '%D' has invalid type", x, x);
4942 DECL_INITIAL (x) = NULL;
4945 if (DECL_INITIAL (x) && pedantic
4946 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
4947 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
4948 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != boolean_type_node
4949 /* Accept an enum that's equivalent to int or unsigned int. */
4950 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
4951 && (TYPE_PRECISION (TREE_TYPE (x))
4952 == TYPE_PRECISION (integer_type_node))))
4953 pedwarn ("%Jbit-field '%D' type invalid in ISO C", x, x);
4955 /* Detect and ignore out of range field width and process valid
4957 if (DECL_INITIAL (x))
4960 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == boolean_type_node
4961 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
4963 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
4964 error ("%Jnegative width in bit-field '%D'", x, x);
4965 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
4966 pedwarn ("%Jwidth of '%D' exceeds its type", x, x);
4967 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
4968 error ("%Jzero width for bit-field '%D'", x, x);
4971 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
4972 unsigned HOST_WIDE_INT width
4973 = tree_low_cst (DECL_INITIAL (x), 1);
4975 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
4976 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
4977 TREE_UNSIGNED (TREE_TYPE (x)))
4979 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
4980 TREE_UNSIGNED (TREE_TYPE (x))))))
4981 warning ("%J'%D' is narrower than values of its type", x, x);
4983 DECL_SIZE (x) = bitsize_int (width);
4984 DECL_BIT_FIELD (x) = 1;
4985 SET_DECL_C_BIT_FIELD (x);
4989 DECL_INITIAL (x) = 0;
4991 /* Detect flexible array member in an invalid context. */
4992 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
4993 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
4994 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
4995 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
4997 if (TREE_CODE (t) == UNION_TYPE)
4998 error ("%Jflexible array member in union", x);
4999 else if (TREE_CHAIN (x) != NULL_TREE)
5000 error ("%Jflexible array member not at end of struct", x);
5001 else if (! saw_named_field)
5002 error ("%Jflexible array member in otherwise empty struct", x);
5005 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5006 && flexible_array_type_p (TREE_TYPE (x)))
5007 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5010 saw_named_field = 1;
5013 detect_field_duplicates (fieldlist);
5015 /* Now we have the nearly final fieldlist. Record it,
5016 then lay out the structure or union (including the fields). */
5018 TYPE_FIELDS (t) = fieldlist;
5022 /* Delete all zero-width bit-fields from the fieldlist */
5024 tree *fieldlistp = &fieldlist;
5026 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5027 *fieldlistp = TREE_CHAIN (*fieldlistp);
5029 fieldlistp = &TREE_CHAIN (*fieldlistp);
5032 /* Now we have the truly final field list.
5033 Store it in this type and in the variants. */
5035 TYPE_FIELDS (t) = fieldlist;
5037 /* If there are lots of fields, sort so we can look through them fast.
5038 We arbitrarily consider 16 or more elts to be "a lot". */
5043 for (x = fieldlist; x; x = TREE_CHAIN (x))
5045 if (len > 15 || DECL_NAME (x) == NULL)
5053 struct lang_type *space;
5054 struct sorted_fields_type *space2;
5056 len += list_length (x);
5058 /* Use the same allocation policy here that make_node uses, to
5059 ensure that this lives as long as the rest of the struct decl.
5060 All decls in an inline function need to be saved. */
5062 space = ggc_alloc (sizeof (struct lang_type));
5063 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5067 field_array = &space2->elts[0];
5068 for (x = fieldlist; x; x = TREE_CHAIN (x))
5070 field_array[len++] = x;
5072 /* If there is anonymous struct or union, break out of the loop. */
5073 if (DECL_NAME (x) == NULL)
5076 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5079 TYPE_LANG_SPECIFIC (t) = space;
5080 TYPE_LANG_SPECIFIC (t)->s->len = len;
5081 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5082 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5087 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5089 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5090 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5091 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5092 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5095 /* If this was supposed to be a transparent union, but we can't
5096 make it one, warn and turn off the flag. */
5097 if (TREE_CODE (t) == UNION_TYPE
5098 && TYPE_TRANSPARENT_UNION (t)
5099 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5101 TYPE_TRANSPARENT_UNION (t) = 0;
5102 warning ("union cannot be made transparent");
5105 /* If this structure or union completes the type of any previous
5106 variable declaration, lay it out and output its rtl. */
5107 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5111 tree decl = TREE_VALUE (x);
5112 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5113 layout_array_type (TREE_TYPE (decl));
5114 if (TREE_CODE (decl) != TYPE_DECL)
5116 layout_decl (decl, 0);
5117 if (c_dialect_objc ())
5118 objc_check_decl (decl);
5119 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5124 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5126 /* Finish debugging output for this type. */
5127 rest_of_type_compilation (t, toplevel);
5132 /* Lay out the type T, and its element type, and so on. */
5135 layout_array_type (tree t)
5137 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5138 layout_array_type (TREE_TYPE (t));
5142 /* Begin compiling the definition of an enumeration type.
5143 NAME is its name (or null if anonymous).
5144 Returns the type object, as yet incomplete.
5145 Also records info about it so that build_enumerator
5146 may be used to declare the individual values as they are read. */
5149 start_enum (tree name)
5153 /* If this is the real definition for a previous forward reference,
5154 fill in the contents in the same object that used to be the
5155 forward reference. */
5158 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5160 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5162 enumtype = make_node (ENUMERAL_TYPE);
5163 pushtag (name, enumtype);
5166 C_TYPE_BEING_DEFINED (enumtype) = 1;
5168 if (TYPE_VALUES (enumtype) != 0)
5170 /* This enum is a named one that has been declared already. */
5171 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5173 /* Completely replace its old definition.
5174 The old enumerators remain defined, however. */
5175 TYPE_VALUES (enumtype) = 0;
5178 enum_next_value = integer_zero_node;
5181 if (flag_short_enums)
5182 TYPE_PACKED (enumtype) = 1;
5187 /* After processing and defining all the values of an enumeration type,
5188 install their decls in the enumeration type and finish it off.
5189 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5190 and ATTRIBUTES are the specified attributes.
5191 Returns ENUMTYPE. */
5194 finish_enum (tree enumtype, tree values, tree attributes)
5197 tree minnode = 0, maxnode = 0, enum_value_type;
5198 int precision, unsign;
5199 int toplevel = (global_scope == current_scope);
5201 if (in_parm_level_p ())
5202 warning ("enum defined inside parms");
5204 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5206 /* Calculate the maximum value of any enumerator in this type. */
5208 if (values == error_mark_node)
5209 minnode = maxnode = integer_zero_node;
5212 minnode = maxnode = TREE_VALUE (values);
5213 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5215 tree value = TREE_VALUE (pair);
5216 if (tree_int_cst_lt (maxnode, value))
5218 if (tree_int_cst_lt (value, minnode))
5223 /* Construct the final type of this enumeration. It is the same
5224 as one of the integral types - the narrowest one that fits, except
5225 that normally we only go as narrow as int - and signed iff any of
5226 the values are negative. */
5227 unsign = (tree_int_cst_sgn (minnode) >= 0);
5228 precision = MAX (min_precision (minnode, unsign),
5229 min_precision (maxnode, unsign));
5230 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5232 tree narrowest = c_common_type_for_size (precision, unsign);
5235 warning ("enumeration values exceed range of largest integer");
5236 narrowest = long_long_integer_type_node;
5239 precision = TYPE_PRECISION (narrowest);
5242 precision = TYPE_PRECISION (integer_type_node);
5244 if (precision == TYPE_PRECISION (integer_type_node))
5245 enum_value_type = c_common_type_for_size (precision, 0);
5247 enum_value_type = enumtype;
5249 TYPE_MIN_VALUE (enumtype) = minnode;
5250 TYPE_MAX_VALUE (enumtype) = maxnode;
5251 TYPE_PRECISION (enumtype) = precision;
5252 TREE_UNSIGNED (enumtype) = unsign;
5253 TYPE_SIZE (enumtype) = 0;
5254 layout_type (enumtype);
5256 if (values != error_mark_node)
5258 /* Change the type of the enumerators to be the enum type. We
5259 need to do this irrespective of the size of the enum, for
5260 proper type checking. Replace the DECL_INITIALs of the
5261 enumerators, and the value slots of the list, with copies
5262 that have the enum type; they cannot be modified in place
5263 because they may be shared (e.g. integer_zero_node) Finally,
5264 change the purpose slots to point to the names of the decls. */
5265 for (pair = values; pair; pair = TREE_CHAIN (pair))
5267 tree enu = TREE_PURPOSE (pair);
5269 TREE_TYPE (enu) = enumtype;
5271 /* The ISO C Standard mandates enumerators to have type int,
5272 even though the underlying type of an enum type is
5273 unspecified. Here we convert any enumerators that fit in
5274 an int to type int, to avoid promotions to unsigned types
5275 when comparing integers with enumerators that fit in the
5276 int range. When -pedantic is given, build_enumerator()
5277 would have already taken care of those that don't fit. */
5278 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5279 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5281 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5283 TREE_PURPOSE (pair) = DECL_NAME (enu);
5284 TREE_VALUE (pair) = DECL_INITIAL (enu);
5287 TYPE_VALUES (enumtype) = values;
5290 /* Fix up all variant types of this enum type. */
5291 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5293 if (tem == enumtype)
5295 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5296 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5297 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5298 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5299 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5300 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5301 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5302 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5303 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5304 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5307 /* Finish debugging output for this type. */
5308 rest_of_type_compilation (enumtype, toplevel);
5313 /* Build and install a CONST_DECL for one value of the
5314 current enumeration type (one that was begun with start_enum).
5315 Return a tree-list containing the CONST_DECL and its value.
5316 Assignment of sequential values by default is handled here. */
5319 build_enumerator (tree name, tree value)
5323 /* Validate and default VALUE. */
5325 /* Remove no-op casts from the value. */
5327 STRIP_TYPE_NOPS (value);
5331 if (TREE_CODE (value) == INTEGER_CST)
5333 value = default_conversion (value);
5334 constant_expression_warning (value);
5338 error ("enumerator value for `%s' not integer constant",
5339 IDENTIFIER_POINTER (name));
5344 /* Default based on previous value. */
5345 /* It should no longer be possible to have NON_LVALUE_EXPR
5349 value = enum_next_value;
5351 error ("overflow in enumeration values");
5354 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5356 pedwarn ("ISO C restricts enumerator values to range of `int'");
5357 value = convert (integer_type_node, value);
5360 /* Set basis for default for next value. */
5361 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5362 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5364 /* Now create a declaration for the enum value name. */
5366 type = TREE_TYPE (value);
5367 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5368 TYPE_PRECISION (integer_type_node)),
5369 (TYPE_PRECISION (type)
5370 >= TYPE_PRECISION (integer_type_node)
5371 && TREE_UNSIGNED (type)));
5373 decl = build_decl (CONST_DECL, name, type);
5374 DECL_INITIAL (decl) = convert (type, value);
5377 return tree_cons (decl, value, NULL_TREE);
5381 /* Create the FUNCTION_DECL for a function definition.
5382 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5383 the declaration; they describe the function's name and the type it returns,
5384 but twisted together in a fashion that parallels the syntax of C.
5386 This function creates a binding context for the function body
5387 as well as setting up the FUNCTION_DECL in current_function_decl.
5389 Returns 1 on success. If the DECLARATOR is not suitable for a function
5390 (it defines a datum instead), we return 0, which tells
5391 yyparse to report a parse error. */
5394 start_function (tree declspecs, tree declarator, tree attributes)
5396 tree decl1, old_decl;
5398 int old_immediate_size_expand = immediate_size_expand;
5400 current_function_returns_value = 0; /* Assume, until we see it does. */
5401 current_function_returns_null = 0;
5402 current_function_returns_abnormally = 0;
5403 warn_about_return_type = 0;
5404 current_extern_inline = 0;
5406 /* Don't expand any sizes in the return type of the function. */
5407 immediate_size_expand = 0;
5409 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5411 /* If the declarator is not suitable for a function definition,
5412 cause a syntax error. */
5415 immediate_size_expand = old_immediate_size_expand;
5419 decl_attributes (&decl1, attributes, 0);
5421 if (DECL_DECLARED_INLINE_P (decl1)
5422 && DECL_UNINLINABLE (decl1)
5423 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5424 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5426 announce_function (decl1);
5428 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5430 error ("return type is an incomplete type");
5431 /* Make it return void instead. */
5433 = build_function_type (void_type_node,
5434 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5437 if (warn_about_return_type)
5438 pedwarn_c99 ("return type defaults to `int'");
5440 /* Save the parm names or decls from this function's declarator
5441 where store_parm_decls will find them. */
5442 current_function_parms = last_function_parms;
5443 current_function_parm_tags = last_function_parm_tags;
5444 current_function_parm_others = last_function_parm_others;
5446 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5447 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5448 DECL_INITIAL (decl1) = error_mark_node;
5450 /* If this definition isn't a prototype and we had a prototype declaration
5451 before, copy the arg type info from that prototype.
5452 But not if what we had before was a builtin function. */
5453 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5454 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5455 && !DECL_BUILT_IN (old_decl)
5456 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5457 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5458 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5460 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5461 current_function_prototype_locus = TREE_LOCUS (old_decl);
5464 /* Optionally warn of old-fashioned def with no previous prototype. */
5465 if (warn_strict_prototypes
5466 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5467 && C_DECL_ISNT_PROTOTYPE (old_decl))
5468 warning ("function declaration isn't a prototype");
5469 /* Optionally warn of any global def with no previous prototype. */
5470 else if (warn_missing_prototypes
5471 && TREE_PUBLIC (decl1)
5472 && ! MAIN_NAME_P (DECL_NAME (decl1))
5473 && C_DECL_ISNT_PROTOTYPE (old_decl))
5474 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5475 /* Optionally warn of any def with no previous prototype
5476 if the function has already been used. */
5477 else if (warn_missing_prototypes
5478 && old_decl != 0 && TREE_USED (old_decl)
5479 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5480 warning ("%J'%D' was used with no prototype before its definition",
5482 /* Optionally warn of any global def with no previous declaration. */
5483 else if (warn_missing_declarations
5484 && TREE_PUBLIC (decl1)
5486 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5487 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5488 /* Optionally warn of any def with no previous declaration
5489 if the function has already been used. */
5490 else if (warn_missing_declarations
5491 && old_decl != 0 && TREE_USED (old_decl)
5492 && C_DECL_IMPLICIT (old_decl))
5493 warning ("%J`%D' was used with no declaration before its definition",
5496 /* This is a definition, not a reference.
5497 So normally clear DECL_EXTERNAL.
5498 However, `extern inline' acts like a declaration
5499 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5500 DECL_EXTERNAL (decl1) = current_extern_inline;
5502 /* This function exists in static storage.
5503 (This does not mean `static' in the C sense!) */
5504 TREE_STATIC (decl1) = 1;
5506 /* A nested function is not global. */
5507 if (current_function_decl != 0)
5508 TREE_PUBLIC (decl1) = 0;
5510 #ifdef ENABLE_CHECKING
5511 /* This is the earliest point at which we might know the assembler
5512 name of the function. Thus, if it's set before this, die horribly. */
5513 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5517 /* If #pragma weak was used, mark the decl weak now. */
5518 if (current_scope == global_scope)
5519 maybe_apply_pragma_weak (decl1);
5521 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5522 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5527 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5528 != integer_type_node)
5529 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5531 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5532 args = TREE_CHAIN (args))
5534 tree type = args ? TREE_VALUE (args) : 0;
5536 if (type == void_type_node)
5543 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5544 pedwarn ("%Jfirst argument of '%D' should be `int'",
5549 if (TREE_CODE (type) != POINTER_TYPE
5550 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5551 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5553 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5558 if (TREE_CODE (type) != POINTER_TYPE
5559 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5560 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5562 pedwarn ("%Jthird argument of '%D' should probably be "
5563 "'char **'", decl1, decl1);
5568 /* It is intentional that this message does not mention the third
5569 argument because it's only mentioned in an appendix of the
5571 if (argct > 0 && (argct < 2 || argct > 3))
5572 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5574 if (! TREE_PUBLIC (decl1))
5575 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5578 /* Record the decl so that the function name is defined.
5579 If we already have a decl for this name, and it is a FUNCTION_DECL,
5580 use the old decl. */
5582 current_function_decl = pushdecl (decl1);
5585 declare_parm_level ();
5587 make_decl_rtl (current_function_decl, NULL);
5589 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5590 /* Promote the value to int before returning it. */
5591 if (c_promoting_integer_type_p (restype))
5593 /* It retains unsignedness if not really getting wider. */
5594 if (TREE_UNSIGNED (restype)
5595 && (TYPE_PRECISION (restype)
5596 == TYPE_PRECISION (integer_type_node)))
5597 restype = unsigned_type_node;
5599 restype = integer_type_node;
5601 DECL_RESULT (current_function_decl)
5602 = build_decl (RESULT_DECL, NULL_TREE, restype);
5604 /* If this fcn was already referenced via a block-scope `extern' decl
5605 (or an implicit decl), propagate certain information about the usage. */
5606 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5607 TREE_ADDRESSABLE (current_function_decl) = 1;
5609 immediate_size_expand = old_immediate_size_expand;
5611 start_fname_decls ();
5616 /* Subroutine of store_parm_decls which handles new-style function
5617 definitions (prototype format). The parms already have decls, so we
5618 need only record them as in effect and complain if any redundant
5619 old-style parm decls were written. */
5621 store_parm_decls_newstyle (void)
5624 tree fndecl = current_function_decl;
5625 tree parms = current_function_parms;
5626 tree tags = current_function_parm_tags;
5627 tree others = current_function_parm_others;
5629 if (current_scope->parms || current_scope->names || current_scope->tags)
5631 error ("%Jold-style parameter declarations in prototyped "
5632 "function definition", fndecl);
5634 /* Get rid of the old-style declarations. */
5639 /* Now make all the parameter declarations visible in the function body.
5640 We can bypass most of the grunt work of pushdecl. */
5641 for (last = 0, decl = parms; decl; last = decl, decl = TREE_CHAIN (decl))
5643 DECL_CONTEXT (decl) = current_function_decl;
5644 if (DECL_NAME (decl) == 0)
5645 error ("%Jparameter name omitted", decl);
5648 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5649 current_scope->shadowed
5650 = tree_cons (DECL_NAME (decl),
5651 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5652 current_scope->shadowed);
5653 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5656 current_scope->parms = parms;
5657 current_scope->parms_last = last;
5659 /* Record the parameter list in the function declaration. */
5660 DECL_ARGUMENTS (fndecl) = parms;
5662 /* Now make all the ancillary declarations visible, likewise. */
5663 for (last = 0, decl = others; decl; last = decl, decl = TREE_CHAIN (decl))
5665 DECL_CONTEXT (decl) = current_function_decl;
5666 if (DECL_NAME (decl)
5667 && TYPE_MAIN_VARIANT (TREE_TYPE (decl)) != void_type_node)
5669 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5670 current_scope->shadowed
5671 = tree_cons (DECL_NAME (decl),
5672 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5673 current_scope->shadowed);
5674 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5677 current_scope->names = others;
5678 current_scope->names_last = last;
5680 /* And all the tag declarations. */
5681 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5682 if (TREE_PURPOSE (decl))
5684 if (IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)))
5685 current_scope->shadowed_tags
5686 = tree_cons (TREE_PURPOSE (decl),
5687 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (decl)),
5688 current_scope->shadowed_tags);
5689 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)) = TREE_VALUE (decl);
5691 current_scope->tags = tags;
5694 /* Subroutine of store_parm_decls which handles old-style function
5695 definitions (separate parameter list and declarations). */
5698 store_parm_decls_oldstyle (void)
5700 tree parm, decl, last;
5701 tree fndecl = current_function_decl;
5703 /* This is the identifier list from the function declarator. */
5704 tree parmids = current_function_parms;
5706 /* We use DECL_WEAK as a flag to show which parameters have been
5707 seen already, since it is not used on PARM_DECL. */
5708 #ifdef ENABLE_CHECKING
5709 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5710 if (DECL_WEAK (parm))
5714 /* Match each formal parameter name with its declaration. Save each
5715 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5716 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5718 if (TREE_VALUE (parm) == 0)
5720 error ("%Jparameter name missing from parameter list", fndecl);
5721 TREE_PURPOSE (parm) = 0;
5725 decl = IDENTIFIER_SYMBOL_VALUE (TREE_VALUE (parm));
5726 if (decl && DECL_CONTEXT (decl) == fndecl)
5728 /* If we got something other than a PARM_DECL it is an error. */
5729 if (TREE_CODE (decl) != PARM_DECL)
5730 error ("%J\"%D\" declared as a non-parameter", decl, decl);
5731 /* If the declaration is already marked, we have a duplicate
5732 name. Complain and ignore the duplicate. */
5733 else if (DECL_WEAK (decl))
5735 error ("%Jmultiple parameters named \"%D\"", decl, decl);
5736 TREE_PURPOSE (parm) = 0;
5739 /* If the declaration says "void", complain and turn it into
5741 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5743 error ("%Jparameter \"%D\" declared void", decl, decl);
5744 TREE_TYPE (decl) = integer_type_node;
5745 DECL_ARG_TYPE (decl) = integer_type_node;
5746 layout_decl (decl, 0);
5749 /* If no declaration found, default to int. */
5752 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5753 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5754 copy_tree_locus (decl, fndecl);
5758 pedwarn ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5759 else if (extra_warnings)
5760 warning ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5763 TREE_PURPOSE (parm) = decl;
5764 DECL_WEAK (decl) = 1;
5767 /* Now examine the parms chain for incomplete declarations
5768 and declarations with no corresponding names. */
5770 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5772 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5774 error ("%Jparameter \"%D\" has incomplete type", parm, parm);
5775 TREE_TYPE (parm) = error_mark_node;
5778 if (! DECL_WEAK (parm))
5780 error ("%Jdeclaration for parameter \"%D\" but no such parameter",
5783 /* Pretend the parameter was not missing.
5784 This gets us to a standard state and minimizes
5785 further error messages. */
5786 parmids = chainon (parmids, tree_cons (parm, 0, 0));
5790 /* Chain the declarations together in the order of the list of
5791 names. Store that chain in the function decl, replacing the
5792 list of names. Update the current scope to match. */
5793 DECL_ARGUMENTS (fndecl) = 0;
5795 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5796 if (TREE_PURPOSE (parm))
5798 if (parm && TREE_PURPOSE (parm))
5800 last = TREE_PURPOSE (parm);
5801 DECL_ARGUMENTS (fndecl) = last;
5802 current_scope->parms = last;
5803 DECL_WEAK (last) = 0;
5805 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
5806 if (TREE_PURPOSE (parm))
5808 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5809 last = TREE_PURPOSE (parm);
5810 DECL_WEAK (last) = 0;
5812 current_scope->parms_last = last;
5813 TREE_CHAIN (last) = 0;
5816 /* If there was a previous prototype,
5817 set the DECL_ARG_TYPE of each argument according to
5818 the type previously specified, and report any mismatches. */
5820 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5823 for (parm = DECL_ARGUMENTS (fndecl),
5824 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5825 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5826 != void_type_node));
5827 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5829 if (parm == 0 || type == 0
5830 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5832 error ("number of arguments doesn't match prototype");
5833 error ("%Hprototype declaration",
5834 ¤t_function_prototype_locus);
5837 /* Type for passing arg must be consistent with that
5838 declared for the arg. ISO C says we take the unqualified
5839 type for parameters declared with qualified type. */
5840 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5841 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
5844 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5845 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5847 /* Adjust argument to match prototype. E.g. a previous
5848 `int foo(float);' prototype causes
5849 `int foo(x) float x; {...}' to be treated like
5850 `int foo(float x) {...}'. This is particularly
5851 useful for argument types like uid_t. */
5852 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5854 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
5855 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5856 && TYPE_PRECISION (TREE_TYPE (parm))
5857 < TYPE_PRECISION (integer_type_node))
5858 DECL_ARG_TYPE (parm) = integer_type_node;
5862 pedwarn ("promoted argument \"%D\" "
5863 "doesn't match prototype", parm);
5864 pedwarn ("%Hprototype declaration",
5865 ¤t_function_prototype_locus);
5870 error ("argument \"%D\" doesn't match prototype", parm);
5871 error ("%Hprototype declaration",
5872 ¤t_function_prototype_locus);
5876 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5879 /* Otherwise, create a prototype that would match. */
5883 tree actual = 0, last = 0, type;
5885 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5887 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
5889 TREE_CHAIN (last) = type;
5894 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5896 TREE_CHAIN (last) = type;
5900 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5901 of the type of this function, but we need to avoid having this
5902 affect the types of other similarly-typed functions, so we must
5903 first force the generation of an identical (but separate) type
5904 node for the relevant function type. The new node we create
5905 will be a variant of the main variant of the original function
5908 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5910 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5914 /* Store the parameter declarations into the current function declaration.
5915 This is called after parsing the parameter declarations, before
5916 digesting the body of the function.
5918 For an old-style definition, construct a prototype out of the old-style
5919 parameter declarations and inject it into the function's type. */
5922 store_parm_decls (void)
5924 tree fndecl = current_function_decl;
5926 /* The function containing FNDECL, if any. */
5927 tree context = decl_function_context (fndecl);
5929 /* True if this definition is written with a prototype. */
5930 bool prototype = (current_function_parms
5931 && TREE_CODE (current_function_parms) != TREE_LIST);
5934 store_parm_decls_newstyle ();
5936 store_parm_decls_oldstyle ();
5938 /* The next call to pushlevel will be a function body. */
5940 next_is_function_body = true;
5942 /* Write a record describing this function definition to the prototypes
5943 file (if requested). */
5945 gen_aux_info_record (fndecl, 1, 0, prototype);
5947 /* Initialize the RTL code for the function. */
5948 allocate_struct_function (fndecl);
5950 /* Begin the statement tree for this function. */
5951 begin_stmt_tree (&DECL_SAVED_TREE (fndecl));
5953 /* If this is a nested function, save away the sizes of any
5954 variable-size types so that we can expand them when generating
5960 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
5961 = nreverse (get_pending_sizes ());
5962 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
5965 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
5968 /* This function is being processed in whole-function mode. */
5969 cfun->x_whole_function_mode_p = 1;
5971 /* Even though we're inside a function body, we still don't want to
5972 call expand_expr to calculate the size of a variable-sized array.
5973 We haven't necessarily assigned RTL to all variables yet, so it's
5974 not safe to try to expand expressions involving them. */
5975 immediate_size_expand = 0;
5976 cfun->x_dont_save_pending_sizes_p = 1;
5979 /* Finish up a function declaration and compile that function
5980 all the way to assembler language output. The free the storage
5981 for the function definition.
5983 This is called after parsing the body of the function definition. */
5988 tree fndecl = current_function_decl;
5990 /* When a function declaration is totally empty, e.g.
5992 (the argument list is irrelevant) the compstmt rule will not
5993 bother calling pushlevel/poplevel, which means we get here with
5994 the scope stack out of sync. Detect this situation by noticing
5995 that current_scope is still as store_parm_decls left it, and do
5996 a dummy push/pop to get back to consistency.
5997 Note that the call to pushlevel does not actually push another
5998 scope - see there for details. */
6000 if (current_scope->parm_flag && next_is_function_body)
6006 if (TREE_CODE (fndecl) == FUNCTION_DECL
6007 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6009 tree args = DECL_ARGUMENTS (fndecl);
6010 for (; args; args = TREE_CHAIN (args))
6012 tree type = TREE_TYPE (args);
6013 if (INTEGRAL_TYPE_P (type)
6014 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6015 DECL_ARG_TYPE (args) = integer_type_node;
6019 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6021 /* Must mark the RESULT_DECL as being in this function. */
6023 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6025 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6027 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6028 != integer_type_node)
6030 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6031 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6033 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6037 #ifdef DEFAULT_MAIN_RETURN
6038 /* Make it so that `main' always returns success by default. */
6039 DEFAULT_MAIN_RETURN;
6042 c_expand_return (integer_zero_node);
6047 finish_fname_decls ();
6049 /* Tie off the statement tree for this function. */
6050 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6052 /* Complain if there's just no return statement. */
6053 if (warn_return_type
6054 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6055 && !current_function_returns_value && !current_function_returns_null
6056 /* Don't complain if we abort. */
6057 && !current_function_returns_abnormally
6058 /* Don't warn for main(). */
6059 && !MAIN_NAME_P (DECL_NAME (fndecl))
6060 /* Or if they didn't actually specify a return type. */
6061 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6062 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6063 inline function, as we might never be compiled separately. */
6064 && DECL_INLINE (fndecl))
6065 warning ("no return statement in function returning non-void");
6067 /* With just -Wextra, complain only if function returns both with
6068 and without a value. */
6070 && current_function_returns_value
6071 && current_function_returns_null)
6072 warning ("this function may return with or without a value");
6074 /* We're leaving the context of this function, so zap cfun. It's still in
6075 DECL_SAVED_INSNS, and we'll restore it in tree_rest_of_compilation. */
6078 /* ??? Objc emits functions after finalizing the compilation unit.
6079 This should be cleaned up later and this conditional removed. */
6080 if (!cgraph_global_info_ready)
6081 cgraph_finalize_function (fndecl, false);
6083 c_expand_body (fndecl);
6084 current_function_decl = NULL;
6087 /* Generate the RTL for a deferred function FNDECL. */
6090 c_expand_deferred_function (tree fndecl)
6092 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6093 function was deferred, e.g. in duplicate_decls. */
6094 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6096 if (flag_inline_trees)
6098 timevar_push (TV_INTEGRATION);
6099 optimize_inline_calls (fndecl);
6100 timevar_pop (TV_INTEGRATION);
6102 c_expand_body (fndecl);
6103 current_function_decl = NULL;
6107 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6108 then we are already in the process of generating RTL for another
6112 c_expand_body_1 (tree fndecl, int nested_p)
6116 /* Make sure that we will evaluate variable-sized types involved
6117 in our function's type. */
6118 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6120 /* Squirrel away our current state. */
6121 push_function_context ();
6124 tree_rest_of_compilation (fndecl, nested_p);
6127 /* Return to the enclosing function. */
6128 pop_function_context ();
6130 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6132 if (targetm.have_ctors_dtors)
6133 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6134 DEFAULT_INIT_PRIORITY);
6136 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6139 if (DECL_STATIC_DESTRUCTOR (fndecl))
6141 if (targetm.have_ctors_dtors)
6142 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6143 DEFAULT_INIT_PRIORITY);
6145 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6149 /* Like c_expand_body_1 but only for unnested functions. */
6152 c_expand_body (tree fndecl)
6154 c_expand_body_1 (fndecl, 0);
6157 /* Check the declarations given in a for-loop for satisfying the C99
6160 check_for_loop_decls (void)
6166 /* If we get here, declarations have been used in a for loop without
6167 the C99 for loop scope. This doesn't make much sense, so don't
6169 error ("'for' loop initial declaration used outside C99 mode");
6172 /* C99 subclause 6.8.5 paragraph 3:
6174 [#3] The declaration part of a for statement shall only
6175 declare identifiers for objects having storage class auto or
6178 It isn't clear whether, in this sentence, "identifiers" binds to
6179 "shall only declare" or to "objects" - that is, whether all identifiers
6180 declared must be identifiers for objects, or whether the restriction
6181 only applies to those that are. (A question on this in comp.std.c
6182 in November 2000 received no answer.) We implement the strictest
6183 interpretation, to avoid creating an extension which later causes
6186 for (t = current_scope->tags; t; t = TREE_CHAIN (t))
6188 if (TREE_PURPOSE (t) != 0)
6190 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6192 if (code == RECORD_TYPE)
6193 error ("'struct %s' declared in 'for' loop initial declaration",
6194 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6195 else if (code == UNION_TYPE)
6196 error ("'union %s' declared in 'for' loop initial declaration",
6197 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6199 error ("'enum %s' declared in 'for' loop initial declaration",
6200 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6204 for (t = getdecls (); t; t = TREE_CHAIN (t))
6206 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6207 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6208 "initial declaration", t, t);
6209 else if (TREE_STATIC (t))
6210 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6211 "initial declaration", t, t);
6212 else if (DECL_EXTERNAL (t))
6213 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6214 "initial declaration", t, t);
6218 /* Save and restore the variables in this file and elsewhere
6219 that keep track of the progress of compilation of the current function.
6220 Used for nested functions. */
6222 struct language_function GTY(())
6224 struct c_language_function base;
6227 int returns_abnormally;
6228 int warn_about_return_type;
6232 /* Save and reinitialize the variables
6233 used during compilation of a C function. */
6236 c_push_function_context (struct function *f)
6238 struct language_function *p;
6239 p = ggc_alloc (sizeof (struct language_function));
6242 p->base.x_stmt_tree = c_stmt_tree;
6243 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6244 p->returns_value = current_function_returns_value;
6245 p->returns_null = current_function_returns_null;
6246 p->returns_abnormally = current_function_returns_abnormally;
6247 p->warn_about_return_type = warn_about_return_type;
6248 p->extern_inline = current_extern_inline;
6251 /* Restore the variables used during compilation of a C function. */
6254 c_pop_function_context (struct function *f)
6256 struct language_function *p = f->language;
6258 if (DECL_SAVED_INSNS (current_function_decl) == 0
6259 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6261 /* Stop pointing to the local nodes about to be freed. */
6262 /* But DECL_INITIAL must remain nonzero so we know this
6263 was an actual function definition. */
6264 DECL_INITIAL (current_function_decl) = error_mark_node;
6265 DECL_ARGUMENTS (current_function_decl) = 0;
6268 c_stmt_tree = p->base.x_stmt_tree;
6269 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6270 current_function_returns_value = p->returns_value;
6271 current_function_returns_null = p->returns_null;
6272 current_function_returns_abnormally = p->returns_abnormally;
6273 warn_about_return_type = p->warn_about_return_type;
6274 current_extern_inline = p->extern_inline;
6279 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6282 c_dup_lang_specific_decl (tree decl)
6284 struct lang_decl *ld;
6286 if (!DECL_LANG_SPECIFIC (decl))
6289 ld = ggc_alloc (sizeof (struct lang_decl));
6290 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6291 DECL_LANG_SPECIFIC (decl) = ld;
6294 /* The functions below are required for functionality of doing
6295 function at once processing in the C front end. Currently these
6296 functions are not called from anywhere in the C front end, but as
6297 these changes continue, that will change. */
6299 /* Returns nonzero if the current statement is a full expression,
6300 i.e. temporaries created during that statement should be destroyed
6301 at the end of the statement. */
6304 stmts_are_full_exprs_p (void)
6309 /* Returns the stmt_tree (if any) to which statements are currently
6310 being added. If there is no active statement-tree, NULL is
6314 current_stmt_tree (void)
6316 return &c_stmt_tree;
6319 /* Returns the stack of SCOPE_STMTs for the current function. */
6322 current_scope_stmt_stack (void)
6324 return &c_scope_stmt_stack;
6327 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6331 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6336 /* Dummy function in place of callback used by C++. */
6339 extract_interface_info (void)
6343 /* Return a new COMPOUND_STMT, after adding it to the current
6347 c_begin_compound_stmt (void)
6351 /* Create the COMPOUND_STMT. */
6352 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6357 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6361 c_expand_decl_stmt (tree t)
6363 tree decl = DECL_STMT_DECL (t);
6365 /* Expand nested functions. */
6366 if (TREE_CODE (decl) == FUNCTION_DECL
6367 && DECL_CONTEXT (decl) == current_function_decl
6368 && DECL_SAVED_TREE (decl))
6369 c_expand_body_1 (decl, 1);
6372 /* Return the global value of T as a symbol. */
6375 identifier_global_value (tree t)
6377 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6378 if (decl == 0 || DECL_FILE_SCOPE_P (decl))
6381 /* Shadowed by something else; find the true global value. */
6382 for (decl = global_scope->names; decl; decl = TREE_CHAIN (decl))
6383 if (DECL_NAME (decl) == t)
6386 /* Only local values for this decl. */
6390 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6391 otherwise the name is found in ridpointers from RID_INDEX. */
6394 record_builtin_type (enum rid rid_index, const char *name, tree type)
6398 id = ridpointers[(int) rid_index];
6400 id = get_identifier (name);
6401 pushdecl (build_decl (TYPE_DECL, id, type));
6404 /* Build the void_list_node (void_type_node having been created). */
6406 build_void_list_node (void)
6408 tree t = build_tree_list (NULL_TREE, void_type_node);
6412 /* Return something to represent absolute declarators containing a *.
6413 TARGET is the absolute declarator that the * contains.
6414 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6415 to apply to the pointer type, represented as identifiers, possible mixed
6418 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6419 if attributes are present) and whose type is the modifier list. */
6422 make_pointer_declarator (tree type_quals_attrs, tree target)
6425 tree itarget = target;
6426 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6427 if (attrs != NULL_TREE)
6428 itarget = tree_cons (attrs, target, NULL_TREE);
6429 return build1 (INDIRECT_REF, quals, itarget);
6432 /* A wrapper around lhd_set_decl_assembler_name that gives static
6433 variables their C names if they are at file scope and only one
6434 translation unit is being compiled, for backwards compatibility
6435 with certain bizarre assembler hacks (like crtstuff.c). */
6438 c_static_assembler_name (tree decl)
6440 if (num_in_fnames == 1
6441 && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6442 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6443 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6445 lhd_set_decl_assembler_name (decl);
6448 /* Hash and equality functions for link_hash_table: key off
6449 DECL_ASSEMBLER_NAME. */
6452 link_hash_hash (const void *x_p)
6455 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6459 link_hash_eq (const void *x1_p, const void *x2_p)
6461 tree x1 = (tree)x1_p;
6462 tree x2 = (tree)x2_p;
6463 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6466 /* Propagate information between definitions and uses between multiple
6467 translation units in TU_LIST based on linkage rules. */
6470 merge_translation_unit_decls (void)
6472 const tree tu_list = current_file_decl;
6475 htab_t link_hash_table;
6478 /* Create the BLOCK that poplevel would have created, but don't
6479 actually call poplevel since that's expensive. */
6480 block = make_node (BLOCK);
6481 BLOCK_VARS (block) = current_scope->names;
6482 TREE_USED (block) = 1;
6483 DECL_INITIAL (current_file_decl) = block;
6485 /* If only one translation unit seen, no copying necessary. */
6486 if (TREE_CHAIN (tu_list) == NULL_TREE)
6489 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6491 /* Enter any actual definitions into the hash table. */
6492 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6493 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6494 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6497 slot = htab_find_slot (link_hash_table, decl, INSERT);
6499 /* If we've already got a definition, work out which one is
6500 the real one, put it into the hash table, and make the
6501 other one DECL_EXTERNAL. This is important to avoid
6502 putting out two definitions of the same symbol in the
6506 tree old_decl = (tree) *slot;
6508 /* If this is weak or common or whatever, suppress it
6509 in favor of the other definition. */
6510 if (DECL_WEAK (decl))
6511 DECL_EXTERNAL (decl) = 1;
6512 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6513 DECL_EXTERNAL (old_decl) = 1;
6514 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6515 DECL_EXTERNAL (decl) = 1;
6516 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6517 DECL_EXTERNAL (old_decl) = 1;
6519 if (DECL_EXTERNAL (decl))
6521 DECL_INITIAL (decl) = NULL_TREE;
6522 DECL_COMMON (decl) = 0;
6523 DECL_ONE_ONLY (decl) = 0;
6524 DECL_WEAK (decl) = 0;
6526 else if (DECL_EXTERNAL (old_decl))
6528 DECL_INITIAL (old_decl) = NULL_TREE;
6529 DECL_COMMON (old_decl) = 0;
6530 DECL_ONE_ONLY (old_decl) = 0;
6531 DECL_WEAK (old_decl) = 0;
6536 error ("%Jredefinition of global '%D'", decl, decl);
6537 error ("%J'%D' previously defined here", old_decl, old_decl);
6544 /* Now insert the desired information from all the definitions
6545 into any plain declarations. */
6546 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6547 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6548 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6551 global_decl = htab_find (link_hash_table, decl);
6556 /* Print any appropriate error messages, and partially merge
6558 (void) duplicate_decls (decl, global_decl, true, true);
6561 htab_delete (link_hash_table);
6564 /* Perform final processing on file-scope data. */
6567 c_write_global_declarations(void)
6571 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6573 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6574 int len = list_length (globals);
6575 tree *vec = xmalloc (sizeof (tree) * len);
6579 /* Process the decls in the order they were written. */
6581 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6584 wrapup_global_declarations (vec, len);
6586 check_global_declarations (vec, len);
6593 /* Reset the parser's state in preparation for a new file. */
6596 c_reset_state (void)
6599 tree file_scope_decl;
6601 /* Pop the global scope. */
6602 if (current_scope != global_scope)
6603 current_scope = global_scope;
6604 file_scope_decl = current_file_decl;
6605 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6606 BLOCK_SUPERCONTEXT (DECL_INITIAL (file_scope_decl)) = file_scope_decl;
6607 truly_local_externals = NULL_TREE;
6609 /* Start a new global binding level. */
6611 global_scope = current_scope;
6612 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6613 TREE_CHAIN (current_file_decl) = file_scope_decl;
6615 /* Reintroduce the builtin declarations. */
6616 for (link = first_builtin_decl;
6617 link != TREE_CHAIN (last_builtin_decl);
6618 link = TREE_CHAIN (link))
6619 pushdecl (copy_node (link));
6622 #include "gt-c-decl.h"