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 /* The Objective-C front-end often needs to determine the current scope. */
416 get_current_scope (void)
418 return current_scope;
421 /* The following function is used only by Objective-C. It needs to live here
422 because it accesses the innards of c_scope. */
425 objc_mark_locals_volatile (void *enclosing_blk)
427 struct c_scope *scope;
429 for (scope = current_scope;
430 scope && scope != enclosing_blk;
431 scope = scope->outer)
435 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
437 DECL_REGISTER (decl) = 0;
438 TREE_THIS_VOLATILE (decl) = 1;
440 /* Do not climb up past the current function. */
441 if (scope->function_body)
446 /* Nonzero if we are currently in the global scope. */
449 global_bindings_p (void)
451 return current_scope == global_scope;
455 keep_next_level (void)
457 keep_next_level_flag = true;
460 /* Identify this scope as currently being filled with parameters. */
463 declare_parm_level (void)
465 current_scope->parm_flag = true;
468 /* Nonzero if currently making parm declarations. */
471 in_parm_level_p (void)
473 return current_scope->parm_flag;
476 /* Enter a new scope. The dummy parameter is for signature
477 compatibility with lang_hooks.decls.pushlevel. */
480 pushlevel (int dummy ATTRIBUTE_UNUSED)
482 if (next_is_function_body)
484 /* This is the transition from the parameters to the top level
485 of the function body. These are the same scope
486 (C99 6.2.1p4,6) so we do not push another scope structure.
487 next_is_function_body is set only by store_parm_decls, which
488 in turn is called when and only when we are about to
489 encounter the opening curly brace for the function body.
491 The outermost block of a function always gets a BLOCK node,
492 because the debugging output routines expect that each
493 function has at least one BLOCK. */
494 current_scope->parm_flag = false;
495 current_scope->function_body = true;
496 current_scope->keep = true;
497 current_scope->outer_function = current_function_scope;
498 current_function_scope = current_scope;
500 keep_next_level_flag = false;
501 next_is_function_body = false;
505 struct c_scope *scope = make_scope ();
507 scope->keep = keep_next_level_flag;
508 scope->outer = current_scope;
509 current_scope = scope;
510 keep_next_level_flag = false;
514 /* Exit a scope. Restore the state of the identifier-decl mappings
515 that were in effect when this scope was entered.
517 If KEEP is KEEP_YES (1), this scope had explicit declarations, so
518 create a BLOCK node to record its declarations and subblocks for
519 debugging output. If KEEP is KEEP_MAYBE, do so only if the names
520 or tags lists are nonempty.
522 The second parameter is ignored; it is present only for
523 signature compatibility with lang_hooks.decls.poplevel.
525 If FUNCTIONBODY is nonzero, this level is the body of a function,
526 even if current_scope->function_body is not set. This is used
527 by language-independent code that generates synthetic functions,
528 and cannot set current_scope->function_body.
530 FIXME: Eliminate the need for all arguments. */
533 poplevel (int keep, int dummy ATTRIBUTE_UNUSED, int functionbody)
535 struct c_scope *scope = current_scope;
540 /* The following line does not use |= due to a bug in HP's C compiler */
541 scope->function_body = scope->function_body | functionbody;
543 if (keep == KEEP_MAYBE)
544 keep = (scope->names || scope->tags);
547 keep |= scope->function_body;
549 /* If appropriate, create a BLOCK to record the decls for the life
554 block = make_node (BLOCK);
555 BLOCK_VARS (block) = scope->names;
556 BLOCK_SUBBLOCKS (block) = scope->blocks;
557 TREE_USED (block) = 1;
560 /* In each subblock, record that this is its superior. */
561 for (p = scope->blocks; p; p = TREE_CHAIN (p))
562 BLOCK_SUPERCONTEXT (p) = block;
564 /* Clear out the variable bindings in this scope.
566 Propagate TREE_ADDRESSABLE from nested functions to their
567 containing functions.
569 Issue warnings for unused variables and labels, and errors for
570 undefined labels, if there are any. */
572 for (p = scope->names; p; p = TREE_CHAIN (p))
574 switch (TREE_CODE (p))
577 if (TREE_USED (p) && !DECL_INITIAL (p))
579 error ("%Jlabel `%D' used but not defined", p, p);
580 DECL_INITIAL (p) = error_mark_node;
582 else if (!TREE_USED (p) && warn_unused_label)
584 if (DECL_INITIAL (p))
585 warning ("%Jlabel `%D' defined but not used", p, p);
587 warning ("%Jlabel `%D' declared but not defined", p, p);
590 IDENTIFIER_LABEL_VALUE (DECL_NAME (p)) = 0;
594 if (! TREE_ASM_WRITTEN (p)
595 && DECL_INITIAL (p) != 0
596 && TREE_ADDRESSABLE (p)
597 && DECL_ABSTRACT_ORIGIN (p) != 0
598 && DECL_ABSTRACT_ORIGIN (p) != p)
599 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
603 /* Keep this in sync with stmt.c:warn_about_unused_variables.
604 No warnings when the global scope is popped because the
605 global scope isn't popped for the last translation unit,
606 so the warnings are done in c_write_global_declaration. */
607 if (warn_unused_variable && scope != global_scope
609 && !DECL_IN_SYSTEM_HEADER (p)
611 && !DECL_ARTIFICIAL (p))
612 warning ("%Junused variable `%D'", p, p);
619 if (DECL_EXTERNAL (p) && scope != global_scope)
620 /* External decls stay in the symbol-value slot but are
622 C_DECL_INVISIBLE (p) = 1;
624 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p)) = 0;
630 /* Clear out the parameter bindings in this scope, if any.
631 Unused-parameter warnings are handled by function.c. */
632 for (p = scope->parms; p; p = TREE_CHAIN (p))
634 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p)) = 0;
636 /* Clear out the tag-meanings declared in this scope.
638 Set the TYPE_CONTEXTs for all of the tagged types belonging to
639 this scope so that they point to the appropriate construct, i.e.
640 either to the current FUNCTION_DECL node, or else to the BLOCK
641 node we just constructed.
643 Note that for tagged types whose scope is just the formal
644 parameter list for some function type specification, we can't
645 properly set their TYPE_CONTEXTs here, because we don't have a
646 pointer to the appropriate FUNCTION_TYPE node readily available
647 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
648 type nodes get set in `grokdeclarator' as soon as we have created
649 the FUNCTION_TYPE node which will represent the "scope" for these
650 "parameter list local" tagged types. */
652 decl = scope->function_body ? current_function_decl : block;
653 for (p = scope->tags; p; p = TREE_CHAIN (p))
655 if (TREE_PURPOSE (p))
656 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p)) = 0;
658 TYPE_CONTEXT (TREE_VALUE (p)) = decl;
661 /* Restore all name- and label-meanings from outer scopes that were
662 shadowed by this scope. */
663 for (p = scope->shadowed; p; p = TREE_CHAIN (p))
664 if (TREE_VALUE (p) && TREE_CODE (TREE_VALUE (p)) == LABEL_DECL)
665 IDENTIFIER_LABEL_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
667 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
669 /* Restore all tag-meanings from outer scopes that were shadowed by
671 for (p = scope->shadowed_tags; p; p = TREE_CHAIN (p))
672 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
674 /* Dispose of the block that we just made inside some higher level. */
675 if (scope->function_body)
676 DECL_INITIAL (current_function_decl) = block;
677 else if (scope->outer)
680 SCOPE_LIST_APPEND (scope->outer, blocks, block);
681 /* If we did not make a block for the scope just exited, any
682 blocks made for inner scopes must be carried forward so they
683 will later become subblocks of something else. */
684 else if (scope->blocks)
685 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
688 /* Pop the current scope, and free the structure for reuse. */
694 /* Insert BLOCK at the end of the list of subblocks of the current
695 scope. This is used when a BIND_EXPR is expanded, to handle the
696 BLOCK node inside the BIND_EXPR. */
699 insert_block (tree block)
701 TREE_USED (block) = 1;
702 SCOPE_LIST_APPEND (current_scope, blocks, block);
705 /* Set the BLOCK node for the innermost scope (the one we are
706 currently in). The RTL expansion machinery requires us to provide
707 this hook, but it is not useful in function-at-a-time mode. */
710 set_block (tree block ATTRIBUTE_UNUSED)
714 /* Push a definition or a declaration of struct, union or enum tag "name".
715 "type" should be the type node.
716 We assume that the tag "name" is not already defined.
718 Note that the definition may really be just a forward reference.
719 In that case, the TYPE_SIZE will be zero. */
722 pushtag (tree name, tree type)
724 struct c_scope *b = current_scope;
726 /* Record the identifier as the type's name if it has none. */
729 if (TYPE_NAME (type) == 0)
730 TYPE_NAME (type) = name;
732 if (IDENTIFIER_TAG_VALUE (name))
733 b->shadowed_tags = tree_cons (name, IDENTIFIER_TAG_VALUE (name),
735 IDENTIFIER_TAG_VALUE (name) = type;
738 b->tags = tree_cons (name, type, b->tags);
740 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
741 tagged type we just added to the current scope. This fake
742 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
743 to output a representation of a tagged type, and it also gives
744 us a convenient place to record the "scope start" address for the
747 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
749 /* An approximation for now, so we can tell this is a function-scope tag.
750 This will be updated in poplevel. */
751 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
754 /* Subroutine of duplicate_decls. Allow harmless mismatches in return
755 and argument types provided that the type modes match. This function
756 return a unified type given a suitable match, and 0 otherwise. */
759 match_builtin_function_types (tree oldtype, tree newtype)
761 tree newrettype, oldrettype;
762 tree newargs, oldargs;
763 tree trytype, tryargs;
765 /* Accept the return type of the new declaration if same modes. */
766 oldrettype = TREE_TYPE (oldtype);
767 newrettype = TREE_TYPE (newtype);
769 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
772 oldargs = TYPE_ARG_TYPES (oldtype);
773 newargs = TYPE_ARG_TYPES (newtype);
776 while (oldargs || newargs)
780 || ! TREE_VALUE (oldargs)
781 || ! TREE_VALUE (newargs)
782 || TYPE_MODE (TREE_VALUE (oldargs))
783 != TYPE_MODE (TREE_VALUE (newargs)))
786 oldargs = TREE_CHAIN (oldargs);
787 newargs = TREE_CHAIN (newargs);
790 trytype = build_function_type (newrettype, tryargs);
791 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
794 /* Handle when a new declaration NEWDECL
795 has the same name as an old one OLDDECL
796 in the same binding contour.
797 Prints an error message if appropriate.
799 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
802 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
803 and OLDDECL is in an outer scope and should thus not be changed. */
806 duplicate_decls (tree newdecl, tree olddecl, int different_binding_level,
809 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl),
811 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
812 && DECL_INITIAL (newdecl) != 0);
813 tree oldtype = TREE_TYPE (olddecl);
814 tree newtype = TREE_TYPE (newdecl);
817 if (DECL_P (olddecl))
819 if (TREE_CODE (newdecl) == FUNCTION_DECL
820 && TREE_CODE (olddecl) == FUNCTION_DECL
821 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
823 if (DECL_DECLARED_INLINE_P (newdecl)
824 && DECL_UNINLINABLE (newdecl)
825 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
826 /* Already warned elsewhere. */;
827 else if (DECL_DECLARED_INLINE_P (olddecl)
828 && DECL_UNINLINABLE (olddecl)
829 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
830 /* Already warned. */;
831 else if (DECL_DECLARED_INLINE_P (newdecl)
832 && ! DECL_DECLARED_INLINE_P (olddecl)
833 && DECL_UNINLINABLE (olddecl)
834 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
836 warning ("%Jfunction '%D' redeclared as inline",
838 warning ("%Jprevious declaration of function '%D' "
839 "with attribute noinline", olddecl, olddecl);
841 else if (DECL_DECLARED_INLINE_P (olddecl)
842 && DECL_UNINLINABLE (newdecl)
843 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
845 warning ("%Jfunction '%D' redeclared with attribute noinline",
847 warning ("%Jprevious declaration of function '%D' was inline",
852 DECL_ATTRIBUTES (newdecl)
853 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
856 if (TREE_CODE (newtype) == ERROR_MARK
857 || TREE_CODE (oldtype) == ERROR_MARK)
860 /* New decl is completely inconsistent with the old one =>
861 tell caller to replace the old one.
862 This is always an error except in the case of shadowing a builtin. */
863 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
865 if (TREE_CODE (olddecl) == FUNCTION_DECL
866 && DECL_BUILT_IN (olddecl))
868 /* If you declare a built-in or predefined function name as static,
869 the old definition is overridden,
870 but optionally warn this was a bad choice of name. */
871 if (!TREE_PUBLIC (newdecl))
874 warning ("%Jshadowing built-in function '%D'",
878 warning ("%Jbuilt-in function '%D' declared as non-function",
883 error ("%J'%D' redeclared as different kind of symbol",
885 error ("%Jprevious declaration of '%D'", olddecl, olddecl);
891 /* For real parm decl following a forward decl, return 1 so old decl
892 will be reused. Only allow this to happen once. */
893 if (types_match && TREE_CODE (newdecl) == PARM_DECL
894 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
896 TREE_ASM_WRITTEN (olddecl) = 0;
900 /* The new declaration is the same kind of object as the old one.
901 The declarations may partially match. Print warnings if they don't
902 match enough. Ultimately, copy most of the information from the new
903 decl to the old one, and keep using the old one. */
905 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
907 /* A function declaration for a built-in function. */
908 if (!TREE_PUBLIC (newdecl))
910 /* If you declare a built-in function name as static, the
911 built-in definition is overridden,
912 but optionally warn this was a bad choice of name. */
914 warning ("%Jshadowing built-in function '%D'", newdecl, newdecl);
915 /* Discard the old built-in function. */
920 /* Accept harmless mismatch in function types.
921 This is for the ffs and fprintf builtins. */
922 tree trytype = match_builtin_function_types (oldtype, newtype);
926 types_match = comptypes (newtype, trytype, COMPARE_STRICT);
929 if (! different_binding_level)
930 TREE_TYPE (olddecl) = oldtype;
935 /* If types don't match for a built-in, throw away the built-in. */
936 warning ("%Jconflicting types for built-in function '%D'",
941 else if (TREE_CODE (olddecl) == FUNCTION_DECL
942 && DECL_SOURCE_LINE (olddecl) == 0)
944 /* A function declaration for a predeclared function
945 that isn't actually built in. */
946 if (!TREE_PUBLIC (newdecl))
948 /* If you declare it as static, the
949 default definition is overridden. */
952 else if (!types_match)
954 /* If the types don't match, preserve volatility indication.
955 Later on, we will discard everything else about the
956 default declaration. */
957 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
960 /* Permit char *foo () to match void *foo (...) if not pedantic,
961 if one of them came from a system header file. */
962 else if (!types_match
963 && TREE_CODE (olddecl) == FUNCTION_DECL
964 && TREE_CODE (newdecl) == FUNCTION_DECL
965 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
966 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
967 && (DECL_IN_SYSTEM_HEADER (olddecl)
968 || DECL_IN_SYSTEM_HEADER (newdecl))
969 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
970 && TYPE_ARG_TYPES (oldtype) == 0
971 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
972 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
974 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
975 && TYPE_ARG_TYPES (newtype) == 0
976 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
977 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
980 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
981 /* Make sure we keep void * as ret type, not char *. */
982 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
983 TREE_TYPE (newdecl) = newtype = oldtype;
985 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
986 we will come back here again. */
987 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
989 /* Permit void foo (...) to match int foo (...) if the latter is the
990 definition and implicit int was used. See c-torture/compile/920625-2.c. */
991 else if (!types_match && new_is_definition
992 && TREE_CODE (olddecl) == FUNCTION_DECL
993 && TREE_CODE (newdecl) == FUNCTION_DECL
994 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
995 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
996 && C_FUNCTION_IMPLICIT_INT (newdecl))
998 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
999 /* Make sure we keep void as the return type. */
1000 TREE_TYPE (newdecl) = newtype = oldtype;
1001 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1003 else if (!types_match
1004 /* Permit char *foo (int, ...); followed by char *foo ();
1006 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1008 /* Return types must still match. */
1009 && comptypes (TREE_TYPE (oldtype),
1010 TREE_TYPE (newtype), COMPARE_STRICT)
1011 && TYPE_ARG_TYPES (newtype) == 0))
1013 error ("%Jconflicting types for '%D'", newdecl, newdecl);
1014 /* Check for function type mismatch
1015 involving an empty arglist vs a nonempty one. */
1016 if (TREE_CODE (olddecl) == FUNCTION_DECL
1017 && comptypes (TREE_TYPE (oldtype),
1018 TREE_TYPE (newtype), COMPARE_STRICT)
1019 && ((TYPE_ARG_TYPES (oldtype) == 0
1020 && DECL_INITIAL (olddecl) == 0)
1022 (TYPE_ARG_TYPES (newtype) == 0
1023 && DECL_INITIAL (newdecl) == 0)))
1025 /* Classify the problem further. */
1026 tree t = TYPE_ARG_TYPES (oldtype);
1028 t = TYPE_ARG_TYPES (newtype);
1029 for (; t; t = TREE_CHAIN (t))
1031 tree type = TREE_VALUE (t);
1033 if (TREE_CHAIN (t) == 0
1034 && TYPE_MAIN_VARIANT (type) != void_type_node)
1036 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1040 if (c_type_promotes_to (type) != type)
1042 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1047 if (C_DECL_IMPLICIT (olddecl))
1048 error ("%Jprevious implicit declaration of '%D'", olddecl, olddecl);
1050 error ("%Jprevious declaration of '%D'", olddecl, olddecl);
1052 /* This is safer because the initializer might contain references
1053 to variables that were declared between olddecl and newdecl. This
1054 will make the initializer invalid for olddecl in case it gets
1055 assigned to olddecl below. */
1056 if (TREE_CODE (newdecl) == VAR_DECL)
1057 DECL_INITIAL (newdecl) = 0;
1059 /* TLS cannot follow non-TLS declaration. */
1060 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1061 && !DECL_THREAD_LOCAL (olddecl) && DECL_THREAD_LOCAL (newdecl))
1063 error ("%Jthread-local declaration of '%D' follows non thread-local "
1064 "declaration", newdecl, newdecl);
1065 error ("%Jprevious declaration of '%D'", olddecl, olddecl);
1067 /* non-TLS declaration cannot follow TLS declaration. */
1068 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1069 && DECL_THREAD_LOCAL (olddecl) && !DECL_THREAD_LOCAL (newdecl))
1071 error ("%Jnon thread-local declaration of '%D' follows "
1072 "thread-local declaration", newdecl, newdecl);
1073 error ("%Jprevious declaration of '%D'", olddecl, olddecl);
1077 errmsg = redeclaration_error_message (newdecl, olddecl);
1083 error ("%Jredefinition of '%D'", newdecl, newdecl);
1086 error ("%Jredeclaration of '%D'", newdecl, newdecl);
1089 error ("%Jconflicting declarations of '%D'", newdecl, newdecl);
1095 if (DECL_INITIAL (olddecl)
1096 && current_scope == global_scope)
1097 error ("%J'%D' previously defined here", olddecl, olddecl);
1099 error ("%J'%D' previously declared here", olddecl, olddecl);
1102 else if (TREE_CODE (newdecl) == TYPE_DECL
1103 && (DECL_IN_SYSTEM_HEADER (olddecl)
1104 || DECL_IN_SYSTEM_HEADER (newdecl)))
1106 warning ("%Jredefinition of '%D'", newdecl, newdecl);
1107 if (DECL_INITIAL (olddecl) && current_scope == global_scope)
1108 warning ("%J'%D' previously defined here", olddecl, olddecl);
1110 warning ("%J'%D' previously declared here", olddecl, olddecl);
1112 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1113 && DECL_INITIAL (olddecl) != 0
1114 && TYPE_ARG_TYPES (oldtype) == 0
1115 && TYPE_ARG_TYPES (newtype) != 0
1116 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1120 /* Prototype decl follows defn w/o prototype. */
1122 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1123 type = TYPE_ARG_TYPES (newtype),
1126 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1128 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1129 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1131 warning ("%Jprototype for '%D' follows", newdecl, newdecl);
1132 warning ("%Jnon-prototype definition here", olddecl);
1135 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1136 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1138 error ("%Jprototype for '%D' follows and number of "
1139 "arguments doesn't match", newdecl, newdecl);
1140 error ("%Jnon-prototype definition here", olddecl);
1144 /* Type for passing arg must be consistent
1145 with that declared for the arg. */
1146 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type),
1149 error ("%Jprototype for '%D' follows and argument %d "
1150 "doesn't match", newdecl, newdecl, nargs);
1151 error ("%Jnon-prototype definition here", olddecl);
1157 /* Warn about mismatches in various flags. */
1160 /* Warn if function is now inline
1161 but was previously declared not inline and has been called. */
1162 if (TREE_CODE (olddecl) == FUNCTION_DECL
1163 && ! DECL_DECLARED_INLINE_P (olddecl)
1164 && DECL_DECLARED_INLINE_P (newdecl)
1165 && TREE_USED (olddecl))
1166 warning ("%J'%D' declared inline after being called",
1168 if (TREE_CODE (olddecl) == FUNCTION_DECL
1169 && ! DECL_DECLARED_INLINE_P (olddecl)
1170 && DECL_DECLARED_INLINE_P (newdecl)
1171 && DECL_INITIAL (olddecl) != 0)
1172 warning ("%J'%D' declared inline after its definition",
1175 /* If pedantic, warn when static declaration follows a non-static
1176 declaration. Otherwise, do so only for functions. */
1177 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1178 && TREE_PUBLIC (olddecl)
1179 && !TREE_PUBLIC (newdecl))
1180 warning ("%Jstatic declaration for '%D' follows non-static",
1183 /* If warn_traditional, warn when a non-static function
1184 declaration follows a static one. */
1185 if (warn_traditional && !in_system_header
1186 && TREE_CODE (olddecl) == FUNCTION_DECL
1187 && !TREE_PUBLIC (olddecl)
1188 && TREE_PUBLIC (newdecl))
1189 warning ("%Jnon-static declaration for '%D' follows static",
1192 /* Warn when const declaration follows a non-const
1193 declaration, but not for functions. */
1194 if (TREE_CODE (olddecl) != FUNCTION_DECL
1195 && !TREE_READONLY (olddecl)
1196 && TREE_READONLY (newdecl))
1197 warning ("%Jconst declaration for '%D' follows non-const",
1199 /* These bits are logically part of the type, for variables.
1200 But not for functions
1201 (where qualifiers are not valid ANSI anyway). */
1202 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1203 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1204 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1205 pedwarn ("%Jtype qualifiers for '%D' conflict with previous "
1206 "declaration", newdecl, newdecl);
1210 /* Optionally warn about more than one declaration for the same name. */
1211 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1212 /* Don't warn about a function declaration
1213 followed by a definition. */
1214 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1215 && DECL_INITIAL (olddecl) == 0)
1216 /* Don't warn about extern decl followed by (tentative) definition. */
1217 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1219 warning ("%Jredundant redeclaration of '%D' in same scope",
1221 warning ("%Jprevious declaration of '%D'", olddecl, olddecl);
1224 /* Copy all the DECL_... slots specified in the new decl
1225 except for any that we copy here from the old type.
1227 Past this point, we don't change OLDTYPE and NEWTYPE
1228 even if we change the types of NEWDECL and OLDDECL. */
1232 /* When copying info to olddecl, we store into write_olddecl
1233 instead. This allows us to avoid modifying olddecl when
1234 different_binding_level is true. */
1235 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1237 /* Merge the data types specified in the two decls. */
1238 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1240 if (different_binding_level)
1242 if (TYPE_ARG_TYPES (oldtype) != 0
1243 && TYPE_ARG_TYPES (newtype) == 0)
1244 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1247 = build_type_attribute_variant
1249 merge_attributes (TYPE_ATTRIBUTES (newtype),
1250 TYPE_ATTRIBUTES (oldtype)));
1254 = TREE_TYPE (olddecl)
1255 = common_type (newtype, oldtype);
1258 /* Lay the type out, unless already done. */
1259 if (oldtype != TREE_TYPE (newdecl))
1261 if (TREE_TYPE (newdecl) != error_mark_node)
1262 layout_type (TREE_TYPE (newdecl));
1263 if (TREE_CODE (newdecl) != FUNCTION_DECL
1264 && TREE_CODE (newdecl) != TYPE_DECL
1265 && TREE_CODE (newdecl) != CONST_DECL)
1266 layout_decl (newdecl, 0);
1270 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1271 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1272 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1273 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1274 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1275 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1277 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1278 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1282 /* Keep the old rtl since we can safely use it. */
1283 COPY_DECL_RTL (olddecl, newdecl);
1285 /* Merge the type qualifiers. */
1286 if (TREE_READONLY (newdecl))
1287 TREE_READONLY (write_olddecl) = 1;
1289 if (TREE_THIS_VOLATILE (newdecl))
1291 TREE_THIS_VOLATILE (write_olddecl) = 1;
1292 if (TREE_CODE (newdecl) == VAR_DECL
1293 /* If an automatic variable is re-declared in the same
1294 function scope, but the old declaration was not
1295 volatile, make_var_volatile() would crash because the
1296 variable would have been assigned to a pseudo, not a
1297 MEM. Since this duplicate declaration is invalid
1298 anyway, we just skip the call. */
1300 make_var_volatile (newdecl);
1303 /* Keep source location of definition rather than declaration. */
1304 /* When called with different_binding_level set, keep the old
1305 information so that meaningful diagnostics can be given. */
1306 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1307 && ! different_binding_level)
1308 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1310 /* Merge the unused-warning information. */
1311 if (DECL_IN_SYSTEM_HEADER (olddecl))
1312 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1313 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1314 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1316 /* Merge the initialization information. */
1317 /* When called with different_binding_level set, don't copy over
1318 DECL_INITIAL, so that we don't accidentally change function
1319 declarations into function definitions. */
1320 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1321 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1323 /* Merge the section attribute.
1324 We want to issue an error if the sections conflict but that must be
1325 done later in decl_attributes since we are called before attributes
1327 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1328 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1330 /* Copy the assembler name.
1331 Currently, it can only be defined in the prototype. */
1332 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1334 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1336 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1337 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1338 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1339 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1340 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1341 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1342 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1343 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1344 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1347 /* If cannot merge, then use the new type and qualifiers,
1348 and don't preserve the old rtl. */
1349 else if (! different_binding_level)
1351 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1352 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1353 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1354 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1357 /* Merge the storage class information. */
1358 merge_weak (newdecl, olddecl);
1360 /* For functions, static overrides non-static. */
1361 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1363 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1364 /* This is since we don't automatically
1365 copy the attributes of NEWDECL into OLDDECL. */
1366 /* No need to worry about different_binding_level here because
1367 then TREE_PUBLIC (newdecl) was true. */
1368 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1369 /* If this clears `static', clear it in the identifier too. */
1370 if (! TREE_PUBLIC (olddecl))
1371 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1373 if (DECL_EXTERNAL (newdecl))
1375 if (! different_binding_level || different_tu)
1377 /* Don't mess with these flags on local externs; they remain
1378 external even if there's a declaration at file scope which
1380 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1381 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1383 /* An extern decl does not override previous storage class. */
1384 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1385 if (! DECL_EXTERNAL (newdecl))
1387 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1388 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1389 /* If we have two non-EXTERNAL file-scope decls that are
1390 the same, only one of them should be written out. */
1392 TREE_ASM_WRITTEN (newdecl) = 1;
1397 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1398 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1401 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1403 /* If we're redefining a function previously defined as extern
1404 inline, make sure we emit debug info for the inline before we
1405 throw it away, in case it was inlined into a function that hasn't
1406 been written out yet. */
1407 if (new_is_definition && DECL_INITIAL (olddecl))
1409 if (TREE_USED (olddecl))
1410 (*debug_hooks->outlining_inline_function) (olddecl);
1412 /* The new defn must not be inline. */
1413 DECL_INLINE (newdecl) = 0;
1414 DECL_UNINLINABLE (newdecl) = 1;
1418 /* If either decl says `inline', this fn is inline,
1419 unless its definition was passed already. */
1420 if (DECL_DECLARED_INLINE_P (newdecl)
1421 || DECL_DECLARED_INLINE_P (olddecl))
1422 DECL_DECLARED_INLINE_P (newdecl) = 1;
1424 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1425 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1428 if (DECL_BUILT_IN (olddecl))
1430 /* Get rid of any built-in function if new arg types don't match it
1431 or if we have a function definition. */
1432 if (! types_match || new_is_definition)
1434 if (! different_binding_level)
1436 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1437 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1442 /* If redeclaring a builtin function, and not a definition,
1443 it stays built in. */
1444 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1445 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1449 /* Also preserve various other info from the definition. */
1450 if (! new_is_definition)
1452 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1453 /* When called with different_binding_level set, don't copy over
1454 DECL_INITIAL, so that we don't accidentally change function
1455 declarations into function definitions. */
1456 if (! different_binding_level)
1457 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1458 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1459 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1460 DECL_ESTIMATED_INSNS (newdecl) = DECL_ESTIMATED_INSNS (olddecl);
1461 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1463 /* Set DECL_INLINE on the declaration if we've got a body
1464 from which to instantiate. */
1465 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1467 DECL_INLINE (newdecl) = 1;
1468 DECL_ABSTRACT_ORIGIN (newdecl)
1469 = (different_binding_level
1470 ? DECL_ORIGIN (olddecl)
1471 : DECL_ABSTRACT_ORIGIN (olddecl));
1476 /* If a previous declaration said inline, mark the
1477 definition as inlinable. */
1478 if (DECL_DECLARED_INLINE_P (newdecl)
1479 && ! DECL_UNINLINABLE (newdecl))
1480 DECL_INLINE (newdecl) = 1;
1483 if (different_binding_level)
1486 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1487 But preserve OLDDECL's DECL_UID. */
1489 unsigned olddecl_uid = DECL_UID (olddecl);
1491 memcpy ((char *) olddecl + sizeof (struct tree_common),
1492 (char *) newdecl + sizeof (struct tree_common),
1493 sizeof (struct tree_decl) - sizeof (struct tree_common));
1494 DECL_UID (olddecl) = olddecl_uid;
1497 /* NEWDECL contains the merged attribute lists.
1498 Update OLDDECL to be the same. */
1499 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1501 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1502 so that encode_section_info has a chance to look at the new decl
1503 flags and attributes. */
1504 if (DECL_RTL_SET_P (olddecl)
1505 && (TREE_CODE (olddecl) == FUNCTION_DECL
1506 || (TREE_CODE (olddecl) == VAR_DECL
1507 && TREE_STATIC (olddecl))))
1508 make_decl_rtl (olddecl, NULL);
1513 /* Return any external DECL associated with ID, whether or not it is
1514 currently in scope. */
1517 any_external_decl (tree id)
1519 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1522 if (decl == 0 || TREE_CODE (decl) == ERROR_MARK)
1524 else if (TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1527 t = purpose_member (id, truly_local_externals);
1529 return TREE_VALUE (t);
1534 /* Record an external decl DECL. This only does something if a
1535 shadowing decl already exists. */
1537 record_external_decl (tree decl)
1539 tree name = DECL_NAME (decl);
1540 if (!IDENTIFIER_SYMBOL_VALUE (name))
1543 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1546 /* Check whether decl-node X shadows an existing declaration.
1547 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1548 which might be a NULL_TREE. */
1550 warn_if_shadowing (tree x, tree old)
1554 /* Nothing to shadow? */
1556 /* Shadow warnings not wanted? */
1558 /* No shadow warnings for internally generated vars. */
1559 || DECL_SOURCE_LINE (x) == 0
1560 /* No shadow warnings for vars made for inlining. */
1561 || DECL_FROM_INLINE (x)
1562 /* Don't warn about the parm names in function declarator
1563 within a function declarator.
1564 It would be nice to avoid warning in any function
1565 declarator in a declaration, as opposed to a definition,
1566 but there is no way to tell it's not a definition. */
1567 || (TREE_CODE (x) == PARM_DECL && current_scope->outer->parm_flag))
1570 name = IDENTIFIER_POINTER (DECL_NAME (x));
1571 if (TREE_CODE (old) == PARM_DECL)
1572 shadow_warning (SW_PARAM, name, old);
1573 else if (DECL_FILE_SCOPE_P (old))
1574 shadow_warning (SW_GLOBAL, name, old);
1576 shadow_warning (SW_LOCAL, name, old);
1580 /* Subroutine of pushdecl.
1582 X is a TYPE_DECL for a typedef statement. Create a brand new
1583 ..._TYPE node (which will be just a variant of the existing
1584 ..._TYPE node with identical properties) and then install X
1585 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1587 The whole point here is to end up with a situation where each
1588 and every ..._TYPE node the compiler creates will be uniquely
1589 associated with AT MOST one node representing a typedef name.
1590 This way, even though the compiler substitutes corresponding
1591 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1592 early on, later parts of the compiler can always do the reverse
1593 translation and get back the corresponding typedef name. For
1596 typedef struct S MY_TYPE;
1599 Later parts of the compiler might only know that `object' was of
1600 type `struct S' if it were not for code just below. With this
1601 code however, later parts of the compiler see something like:
1603 struct S' == struct S
1604 typedef struct S' MY_TYPE;
1607 And they can then deduce (from the node for type struct S') that
1608 the original object declaration was:
1612 Being able to do this is important for proper support of protoize,
1613 and also for generating precise symbolic debugging information
1614 which takes full account of the programmer's (typedef) vocabulary.
1616 Obviously, we don't want to generate a duplicate ..._TYPE node if
1617 the TYPE_DECL node that we are now processing really represents a
1618 standard built-in type.
1620 Since all standard types are effectively declared at line zero
1621 in the source file, we can easily check to see if we are working
1622 on a standard type by checking the current value of lineno. */
1625 clone_underlying_type (tree x)
1627 if (DECL_SOURCE_LINE (x) == 0)
1629 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1630 TYPE_NAME (TREE_TYPE (x)) = x;
1632 else if (TREE_TYPE (x) != error_mark_node
1633 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1635 tree tt = TREE_TYPE (x);
1636 DECL_ORIGINAL_TYPE (x) = tt;
1637 tt = build_type_copy (tt);
1639 TREE_USED (tt) = TREE_USED (x);
1644 /* Record a decl-node X as belonging to the current lexical scope.
1645 Check for errors (such as an incompatible declaration for the same
1646 name already seen in the same scope).
1648 Returns either X or an old decl for the same name.
1649 If an old decl is returned, it may have been smashed
1650 to agree with what X says. */
1655 tree name = DECL_NAME (x);
1656 struct c_scope *scope = current_scope;
1658 #ifdef ENABLE_CHECKING
1659 if (error_mark_node == 0)
1660 /* Called too early. */
1664 /* Functions need the lang_decl data. */
1665 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1666 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1668 /* A local extern declaration for a function doesn't constitute nesting.
1669 A local auto declaration does, since it's a forward decl
1670 for a nested function coming later. */
1671 if (current_function_decl == NULL
1672 || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1673 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
1674 DECL_CONTEXT (x) = current_file_decl;
1676 DECL_CONTEXT (x) = current_function_decl;
1682 if (warn_nested_externs
1683 && scope != global_scope
1684 && DECL_EXTERNAL (x)
1685 && !DECL_IN_SYSTEM_HEADER (x))
1686 warning ("nested extern declaration of `%s'",
1687 IDENTIFIER_POINTER (name));
1689 old = lookup_name_current_level (name);
1690 if (old && duplicate_decls (x, old, 0, false))
1692 /* For PARM_DECLs, old may be a forward declaration.
1693 If so, we want to remove it from its old location
1694 (in the variables chain) and rechain it in the
1695 location given by the new declaration. */
1696 if (TREE_CODE (x) == PARM_DECL)
1699 for (p = &scope->names; *p; p = &TREE_CHAIN (*p))
1702 *p = TREE_CHAIN (old);
1703 SCOPE_LIST_APPEND (scope, parms, old);
1709 if (DECL_EXTERNAL (x) || scope == global_scope)
1711 /* Find and check against a previous, not-in-scope, external
1712 decl for this identifier. (C99 s???: If two declarations
1713 with external linkage, referring to the same object, have
1714 incompatible types, the behavior is undefined). */
1715 tree ext = any_external_decl (name);
1718 if (duplicate_decls (x, ext, scope != global_scope,
1720 x = copy_node (ext);
1723 record_external_decl (x);
1726 if (TREE_CODE (x) == TYPE_DECL)
1727 clone_underlying_type (x);
1729 /* If storing a local value, there may already be one
1730 (inherited). If so, record it for restoration when this
1731 scope ends. Take care not to do this if we are replacing an
1732 older decl in the same scope (i.e. duplicate_decls returned
1734 if (scope != global_scope
1735 && IDENTIFIER_SYMBOL_VALUE (name)
1736 && IDENTIFIER_SYMBOL_VALUE (name) != old)
1738 warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
1739 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1743 /* Install the new declaration in the requested scope. */
1744 IDENTIFIER_SYMBOL_VALUE (name) = x;
1745 C_DECL_INVISIBLE (x) = 0;
1747 /* If x's type is incomplete because it's based on a
1748 structure or union which has not yet been fully declared,
1749 attach it to that structure or union type, so we can go
1750 back and complete the variable declaration later, if the
1751 structure or union gets fully declared.
1753 If the input is erroneous, we can have error_mark in the type
1754 slot (e.g. "f(void a, ...)") - that doesn't count as an
1756 if (TREE_TYPE (x) != error_mark_node
1757 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1759 tree element = TREE_TYPE (x);
1761 while (TREE_CODE (element) == ARRAY_TYPE)
1762 element = TREE_TYPE (element);
1763 element = TYPE_MAIN_VARIANT (element);
1765 if ((TREE_CODE (element) == RECORD_TYPE
1766 || TREE_CODE (element) == UNION_TYPE)
1767 && (TREE_CODE (x) != TYPE_DECL
1768 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
1769 && !COMPLETE_TYPE_P (element))
1770 C_TYPE_INCOMPLETE_VARS (element)
1771 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
1775 if (TREE_CODE (x) == PARM_DECL)
1776 SCOPE_LIST_APPEND (scope, parms, x);
1778 SCOPE_LIST_APPEND (scope, names, x);
1783 /* Record X as belonging to the global scope (C99 "file scope").
1784 This is used only internally by the Objective-C front end,
1785 and is limited to its needs. duplicate_decls is not called;
1786 if there is any preexisting decl for this identifier, it is an ICE. */
1789 pushdecl_top_level (tree x)
1793 if (TREE_CODE (x) != VAR_DECL)
1796 name = DECL_NAME (x);
1798 if (IDENTIFIER_SYMBOL_VALUE (name))
1801 DECL_CONTEXT (x) = current_file_decl;
1802 IDENTIFIER_SYMBOL_VALUE (name) = x;
1804 SCOPE_LIST_APPEND (global_scope, names, x);
1808 /* Generate an implicit declaration for identifier FUNCTIONID as a
1809 function of type int (). */
1812 implicitly_declare (tree functionid)
1814 tree decl = any_external_decl (functionid);
1818 /* Implicit declaration of a function already declared
1819 (somehow) in a different scope, or as a built-in.
1820 If this is the first time this has happened, warn;
1821 then recycle the old declaration. */
1822 if (!C_DECL_IMPLICIT (decl))
1824 implicit_decl_warning (DECL_NAME (decl));
1825 if (! DECL_FILE_SCOPE_P (decl))
1826 warning ("%Jprevious declaration of '%D'", decl, decl);
1827 C_DECL_IMPLICIT (decl) = 1;
1829 /* If this function is global, then it must already be in the
1830 global scope, so there's no need to push it again. */
1831 if (current_scope == global_scope)
1833 /* If this is a local declaration, make a copy; we can't have
1834 the same DECL listed in two different scopes. */
1835 return pushdecl (copy_node (decl));
1838 /* Not seen before. */
1839 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1840 DECL_EXTERNAL (decl) = 1;
1841 TREE_PUBLIC (decl) = 1;
1842 C_DECL_IMPLICIT (decl) = 1;
1843 implicit_decl_warning (functionid);
1845 /* C89 says implicit declarations are in the innermost block.
1846 So we record the decl in the standard fashion. */
1847 decl = pushdecl (decl);
1849 /* No need to call objc_check_decl here - it's a function type. */
1850 rest_of_decl_compilation (decl, NULL, 0, 0);
1852 /* Write a record describing this implicit function declaration
1853 to the prototypes file (if requested). */
1854 gen_aux_info_record (decl, 0, 1, 0);
1856 /* Possibly apply some default attributes to this implicit declaration. */
1857 decl_attributes (&decl, NULL_TREE, 0);
1863 implicit_decl_warning (tree id)
1865 const char *name = IDENTIFIER_POINTER (id);
1866 if (mesg_implicit_function_declaration == 2)
1867 error ("implicit declaration of function `%s'", name);
1868 else if (mesg_implicit_function_declaration == 1)
1869 warning ("implicit declaration of function `%s'", name);
1872 /* Return zero if the declaration NEWDECL is valid
1873 when the declaration OLDDECL (assumed to be for the same name)
1874 has already been seen.
1875 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
1876 and 3 if it is a conflicting declaration. */
1879 redeclaration_error_message (tree newdecl, tree olddecl)
1881 if (TREE_CODE (newdecl) == TYPE_DECL)
1883 /* Do not complain about type redeclarations where at least one
1884 declaration was in a system header. */
1885 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
1889 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1891 /* Declarations of functions can insist on internal linkage
1892 but they can't be inconsistent with internal linkage,
1893 so there can be no error on that account.
1894 However defining the same name twice is no good. */
1895 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
1896 /* However, defining once as extern inline and a second
1897 time in another way is ok. */
1898 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
1899 && ! (DECL_DECLARED_INLINE_P (newdecl)
1900 && DECL_EXTERNAL (newdecl))))
1904 else if (DECL_FILE_SCOPE_P (newdecl))
1906 /* Objects declared at file scope: */
1907 /* If at least one is a reference, it's ok. */
1908 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
1910 /* Reject two definitions. */
1911 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
1913 /* Now we have two tentative defs, or one tentative and one real def. */
1914 /* Insist that the linkage match. */
1915 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
1919 else if (current_scope->parm_flag
1920 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1924 /* Newdecl has block scope. If olddecl has block scope also, then
1925 reject two definitions, and reject a definition together with an
1926 external reference. Otherwise, it is OK, because newdecl must
1927 be an extern reference to olddecl. */
1928 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
1929 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
1935 /* Issue an error message for a reference to an undeclared variable
1936 ID, including a reference to a builtin outside of function-call
1937 context. Establish a binding of the identifier to error_mark_node
1938 in an appropriate scope, which will suppress further errors for the
1941 undeclared_variable (tree id)
1943 static bool already = false;
1944 struct c_scope *scope;
1946 if (current_function_decl == 0)
1948 error ("`%s' undeclared here (not in a function)",
1949 IDENTIFIER_POINTER (id));
1950 scope = current_scope;
1954 error ("`%s' undeclared (first use in this function)",
1955 IDENTIFIER_POINTER (id));
1959 error ("(Each undeclared identifier is reported only once");
1960 error ("for each function it appears in.)");
1964 scope = current_function_scope;
1967 scope->shadowed = tree_cons (id, IDENTIFIER_SYMBOL_VALUE (id),
1969 IDENTIFIER_SYMBOL_VALUE (id) = error_mark_node;
1972 /* Subroutine of lookup_label, declare_label, define_label: construct a
1973 LABEL_DECL with all the proper frills. */
1976 make_label (tree name, location_t location)
1978 tree label = build_decl (LABEL_DECL, name, void_type_node);
1980 DECL_CONTEXT (label) = current_function_decl;
1981 DECL_MODE (label) = VOIDmode;
1982 DECL_SOURCE_LOCATION (label) = location;
1987 /* Another subroutine of lookup_label, declare_label, define_label:
1988 set up the binding of name to LABEL_DECL in the given SCOPE. */
1991 bind_label (tree name, tree label, struct c_scope *scope)
1993 if (IDENTIFIER_LABEL_VALUE (name))
1994 scope->shadowed = tree_cons (name, IDENTIFIER_LABEL_VALUE (name),
1996 IDENTIFIER_LABEL_VALUE (name) = label;
1998 SCOPE_LIST_APPEND (scope, names, label);
2001 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2002 Create one if none exists so far for the current function.
2003 This is called when a label is used in a goto expression or
2004 has its address taken. */
2007 lookup_label (tree name)
2011 if (current_function_decl == 0)
2013 error ("label %s referenced outside of any function",
2014 IDENTIFIER_POINTER (name));
2018 /* Use a label already defined or ref'd with this name, but not if
2019 it is inherited from a containing function and wasn't declared
2021 label = IDENTIFIER_LABEL_VALUE (name);
2022 if (label && (DECL_CONTEXT (label) == current_function_decl
2023 || C_DECLARED_LABEL_FLAG (label)))
2025 /* If the label has only been declared, update its apparent
2026 location to point here, for better diagnostics if it
2027 turns out not to have been defined. */
2028 if (!TREE_USED (label))
2029 DECL_SOURCE_LOCATION (label) = input_location;
2033 /* No label binding for that identifier; make one. */
2034 label = make_label (name, input_location);
2036 /* Ordinary labels go in the current function scope. */
2037 bind_label (name, label, current_function_scope);
2041 /* Make a label named NAME in the current function, shadowing silently
2042 any that may be inherited from containing functions or containing
2043 scopes. This is called for __label__ declarations. */
2045 /* Note that valid use, if the label being shadowed comes from another
2046 scope in the same function, requires calling declare_nonlocal_label
2047 right away. (Is this still true? -zw 2003-07-17) */
2050 declare_label (tree name)
2052 tree label = IDENTIFIER_LABEL_VALUE (name);
2055 /* Check to make sure that the label hasn't already been declared
2057 for (dup = current_scope->names; dup; dup = TREE_CHAIN (dup))
2060 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2061 error ("%Jthis is a previous declaration", dup);
2063 /* Just use the previous declaration. */
2067 label = make_label (name, input_location);
2068 C_DECLARED_LABEL_FLAG (label) = 1;
2070 /* Declared labels go in the current scope. */
2071 bind_label (name, label, current_scope);
2075 /* Define a label, specifying the location in the source file.
2076 Return the LABEL_DECL node for the label, if the definition is valid.
2077 Otherwise return 0. */
2080 define_label (location_t location, tree name)
2084 /* Find any preexisting label with this name. It is an error
2085 if that label has already been defined in this function, or
2086 if there is a containing function with a declared label with
2088 label = IDENTIFIER_LABEL_VALUE (name);
2091 && ((DECL_CONTEXT (label) == current_function_decl
2092 && DECL_INITIAL (label) != 0)
2093 || (DECL_CONTEXT (label) != current_function_decl
2094 && C_DECLARED_LABEL_FLAG (label))))
2096 error ("%Hduplicate label `%D'", &location, label);
2097 if (DECL_INITIAL (label))
2098 error ("%J`%D' previously defined here", label, label);
2100 error ("%J`%D' previously declared here", label, label);
2103 else if (label && DECL_CONTEXT (label) == current_function_decl)
2105 /* The label has been used or declared already in this function,
2106 but not defined. Update its location to point to this
2108 DECL_SOURCE_LOCATION (label) = location;
2112 /* No label binding for that identifier; make one. */
2113 label = make_label (name, location);
2115 /* Ordinary labels go in the current function scope. */
2116 bind_label (name, label, current_function_scope);
2119 if (warn_traditional && !in_system_header && lookup_name (name))
2120 warning ("%Htraditional C lacks a separate namespace for labels, "
2121 "identifier `%s' conflicts", &location,
2122 IDENTIFIER_POINTER (name));
2124 /* Mark label as having been defined. */
2125 DECL_INITIAL (label) = error_mark_node;
2129 /* Return the list of declarations of the current scope. */
2134 return current_scope->names;
2138 /* Given NAME, an IDENTIFIER_NODE,
2139 return the structure (or union or enum) definition for that name.
2140 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2141 CODE says which kind of type the caller wants;
2142 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2143 If the wrong kind of type is found, an error is reported. */
2146 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2148 tree tag = IDENTIFIER_TAG_VALUE (name);
2154 /* We only care about whether it's in this level if
2155 thislevel_only was set or it might be a type clash. */
2156 if (thislevel_only || TREE_CODE (tag) != code)
2158 if (current_scope == global_scope
2159 || purpose_member (name, current_scope->tags))
2163 if (thislevel_only && !thislevel)
2166 if (TREE_CODE (tag) != code)
2168 /* Definition isn't the kind we were looking for. */
2169 pending_invalid_xref = name;
2170 pending_invalid_xref_location = input_location;
2172 /* If in the same binding level as a declaration as a tag
2173 of a different type, this must not be allowed to
2174 shadow that tag, so give the error immediately.
2175 (For example, "struct foo; union foo;" is invalid.) */
2177 pending_xref_error ();
2182 /* Print an error message now
2183 for a recent invalid struct, union or enum cross reference.
2184 We don't print them immediately because they are not invalid
2185 when used in the `struct foo;' construct for shadowing. */
2188 pending_xref_error (void)
2190 if (pending_invalid_xref != 0)
2191 error ("%H`%s' defined as wrong kind of tag",
2192 &pending_invalid_xref_location,
2193 IDENTIFIER_POINTER (pending_invalid_xref));
2194 pending_invalid_xref = 0;
2198 /* Look up NAME in the current scope and its superiors
2199 in the namespace of variables, functions and typedefs.
2200 Return a ..._DECL node of some kind representing its definition,
2201 or return 0 if it is undefined. */
2204 lookup_name (tree name)
2206 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2207 if (decl == 0 || decl == error_mark_node)
2209 if (C_DECL_INVISIBLE (decl))
2214 /* Similar to `lookup_name' but look only at the current scope. */
2217 lookup_name_current_level (tree name)
2219 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2221 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2224 if (current_scope == global_scope)
2227 /* Scan the current scope for a decl with name NAME.
2228 For PARM_DECLs, we have to look at both ->parms and ->names, since
2229 forward parameter declarations wind up on the ->names list. */
2230 if (TREE_CODE (decl) == PARM_DECL
2231 && chain_member (decl, current_scope->parms))
2233 if (chain_member (decl, current_scope->names))
2239 /* Create the predefined scalar types of C,
2240 and some nodes representing standard constants (0, 1, (void *) 0).
2241 Initialize the global scope.
2242 Make definitions for built-in primitive functions. */
2245 c_init_decl_processing (void)
2248 tree ptr_ftype_void, ptr_ftype_ptr;
2249 location_t save_loc = input_location;
2251 /* Adds some ggc roots, and reserved words for c-parse.in. */
2254 current_function_decl = 0;
2256 /* Make the c_scope structure for global names. */
2258 global_scope = current_scope;
2260 /* Declarations from c_common_nodes_and_builtins must not be associated
2261 with this input file, lest we get differences between using and not
2262 using preprocessed headers. */
2263 input_location.file = "<internal>";
2264 input_location.line = 0;
2266 /* Make the DECL for the toplevel file scope. */
2267 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
2269 build_common_tree_nodes (flag_signed_char);
2271 c_common_nodes_and_builtins ();
2273 /* In C, comparisons and TRUTH_* expressions have type int. */
2274 truthvalue_type_node = integer_type_node;
2275 truthvalue_true_node = integer_one_node;
2276 truthvalue_false_node = integer_zero_node;
2278 /* Even in C99, which has a real boolean type. */
2279 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2280 boolean_type_node));
2282 endlink = void_list_node;
2283 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2285 = build_function_type (ptr_type_node,
2286 tree_cons (NULL_TREE, ptr_type_node, endlink));
2288 input_location = save_loc;
2290 pedantic_lvalues = pedantic;
2292 make_fname_decl = c_make_fname_decl;
2293 start_fname_decls ();
2295 first_builtin_decl = global_scope->names;
2296 last_builtin_decl = global_scope->names_last;
2299 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2300 decl, NAME is the initialization string and TYPE_DEP indicates whether
2301 NAME depended on the type of the function. As we don't yet implement
2302 delayed emission of static data, we mark the decl as emitted
2303 so it is not placed in the output. Anything using it must therefore pull
2304 out the STRING_CST initializer directly. FIXME. */
2307 c_make_fname_decl (tree id, int type_dep)
2309 const char *name = fname_as_string (type_dep);
2310 tree decl, type, init;
2311 size_t length = strlen (name);
2313 type = build_array_type
2314 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2315 build_index_type (size_int (length)));
2317 decl = build_decl (VAR_DECL, id, type);
2319 TREE_STATIC (decl) = 1;
2320 TREE_READONLY (decl) = 1;
2321 DECL_ARTIFICIAL (decl) = 1;
2323 init = build_string (length + 1, name);
2324 TREE_TYPE (init) = type;
2325 DECL_INITIAL (decl) = init;
2327 TREE_USED (decl) = 1;
2329 if (current_function_decl)
2331 DECL_CONTEXT (decl) = current_function_decl;
2332 IDENTIFIER_SYMBOL_VALUE (id) = decl;
2333 SCOPE_LIST_APPEND (current_function_scope, names, decl);
2336 finish_decl (decl, init, NULL_TREE);
2341 /* Return a definition for a builtin function named NAME and whose data type
2342 is TYPE. TYPE should be a function type with argument types.
2343 FUNCTION_CODE tells later passes how to compile calls to this function.
2344 See tree.h for its possible values.
2346 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2347 the name to be called if we can't opencode the function. If
2348 ATTRS is nonzero, use that for the function's attribute list. */
2351 builtin_function (const char *name, tree type, int function_code,
2352 enum built_in_class class, const char *library_name,
2355 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2356 DECL_EXTERNAL (decl) = 1;
2357 TREE_PUBLIC (decl) = 1;
2359 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2360 make_decl_rtl (decl, NULL);
2362 DECL_BUILT_IN_CLASS (decl) = class;
2363 DECL_FUNCTION_CODE (decl) = function_code;
2365 /* Warn if a function in the namespace for users
2366 is used without an occasion to consider it declared. */
2367 if (name[0] != '_' || name[1] != '_')
2368 C_DECL_INVISIBLE (decl) = 1;
2370 /* Possibly apply some default attributes to this built-in function. */
2372 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2374 decl_attributes (&decl, NULL_TREE, 0);
2379 /* Called when a declaration is seen that contains no names to declare.
2380 If its type is a reference to a structure, union or enum inherited
2381 from a containing scope, shadow that tag name for the current scope
2382 with a forward reference.
2383 If its type defines a new named structure or union
2384 or defines an enum, it is valid but we need not do anything here.
2385 Otherwise, it is an error. */
2388 shadow_tag (tree declspecs)
2390 shadow_tag_warned (declspecs, 0);
2394 shadow_tag_warned (tree declspecs, int warned)
2397 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2404 pending_invalid_xref = 0;
2406 /* Remove the attributes from declspecs, since they will confuse the
2408 split_specs_attrs (declspecs, &specs, &attrs);
2410 for (link = specs; link; link = TREE_CHAIN (link))
2412 tree value = TREE_VALUE (link);
2413 enum tree_code code = TREE_CODE (value);
2415 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2416 /* Used to test also that TYPE_SIZE (value) != 0.
2417 That caused warning for `struct foo;' at top level in the file. */
2419 tree name = TYPE_NAME (value);
2426 if (warned != 1 && code != ENUMERAL_TYPE)
2427 /* Empty unnamed enum OK */
2429 pedwarn ("unnamed struct/union that defines no instances");
2435 t = lookup_tag (code, name, 1);
2439 t = make_node (code);
2446 if (!warned && ! in_system_header)
2448 warning ("useless keyword or type name in empty declaration");
2455 error ("two types specified in one empty declaration");
2460 pedwarn ("empty declaration");
2464 /* Construct an array declarator. EXPR is the expression inside [], or
2465 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2466 to the pointer to which a parameter array is converted). STATIC_P is
2467 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2468 is nonzero is the array is [*], a VLA of unspecified length which is
2469 nevertheless a complete type (not currently implemented by GCC),
2470 zero otherwise. The declarator is constructed as an ARRAY_REF
2471 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2472 left of the [] (filled by in set_array_declarator_type) and operand 1
2473 is the expression inside; whose TREE_TYPE is the type qualifiers and
2474 which has TREE_STATIC set if "static" is used. */
2477 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2480 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2481 TREE_TYPE (decl) = quals;
2482 TREE_STATIC (decl) = (static_p ? 1 : 0);
2483 if (pedantic && !flag_isoc99)
2485 if (static_p || quals != NULL_TREE)
2486 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2488 pedwarn ("ISO C90 does not support `[*]' array declarators");
2491 warning ("GCC does not yet properly implement `[*]' array declarators");
2495 /* Set the type of an array declarator. DECL is the declarator, as
2496 constructed by build_array_declarator; TYPE is what appears on the left
2497 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2498 abstract declarator, zero otherwise; this is used to reject static and
2499 type qualifiers in abstract declarators, where they are not in the
2503 set_array_declarator_type (tree decl, tree type, int abstract_p)
2505 TREE_OPERAND (decl, 0) = type;
2506 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2507 error ("static or type qualifiers in abstract declarator");
2511 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2514 groktypename (tree typename)
2518 if (TREE_CODE (typename) != TREE_LIST)
2521 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2523 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
2525 /* Apply attributes. */
2526 decl_attributes (&typename, attrs, 0);
2531 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2534 groktypename_in_parm_context (tree typename)
2536 if (TREE_CODE (typename) != TREE_LIST)
2538 return grokdeclarator (TREE_VALUE (typename),
2539 TREE_PURPOSE (typename),
2543 /* Decode a declarator in an ordinary declaration or data definition.
2544 This is called as soon as the type information and variable name
2545 have been parsed, before parsing the initializer if any.
2546 Here we create the ..._DECL node, fill in its type,
2547 and put it on the list of decls for the current context.
2548 The ..._DECL node is returned as the value.
2550 Exception: for arrays where the length is not specified,
2551 the type is left null, to be filled in by `finish_decl'.
2553 Function definitions do not come here; they go to start_function
2554 instead. However, external and forward declarations of functions
2555 do go through here. Structure field declarations are done by
2556 grokfield and not through here. */
2559 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2564 /* An object declared as __attribute__((deprecated)) suppresses
2565 warnings of uses of other deprecated items. */
2566 if (lookup_attribute ("deprecated", attributes))
2567 deprecated_state = DEPRECATED_SUPPRESS;
2569 decl = grokdeclarator (declarator, declspecs,
2570 NORMAL, initialized);
2572 deprecated_state = DEPRECATED_NORMAL;
2574 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2575 && MAIN_NAME_P (DECL_NAME (decl)))
2576 warning ("%J'%D' is usually a function", decl, decl);
2579 /* Is it valid for this decl to have an initializer at all?
2580 If not, set INITIALIZED to zero, which will indirectly
2581 tell `finish_decl' to ignore the initializer once it is parsed. */
2582 switch (TREE_CODE (decl))
2585 error ("typedef `%s' is initialized (use __typeof__ instead)",
2586 IDENTIFIER_POINTER (DECL_NAME (decl)));
2591 error ("function `%s' is initialized like a variable",
2592 IDENTIFIER_POINTER (DECL_NAME (decl)));
2597 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2598 error ("parameter `%s' is initialized",
2599 IDENTIFIER_POINTER (DECL_NAME (decl)));
2604 /* Don't allow initializations for incomplete types
2605 except for arrays which might be completed by the initialization. */
2607 /* This can happen if the array size is an undefined macro. We already
2608 gave a warning, so we don't need another one. */
2609 if (TREE_TYPE (decl) == error_mark_node)
2611 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2613 /* A complete type is ok if size is fixed. */
2615 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2616 || C_DECL_VARIABLE_SIZE (decl))
2618 error ("variable-sized object may not be initialized");
2622 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2624 error ("variable `%s' has initializer but incomplete type",
2625 IDENTIFIER_POINTER (DECL_NAME (decl)));
2628 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2630 error ("elements of array `%s' have incomplete type",
2631 IDENTIFIER_POINTER (DECL_NAME (decl)));
2638 DECL_EXTERNAL (decl) = 0;
2639 if (current_scope == global_scope)
2640 TREE_STATIC (decl) = 1;
2642 /* Tell `pushdecl' this is an initialized decl
2643 even though we don't yet have the initializer expression.
2644 Also tell `finish_decl' it may store the real initializer. */
2645 DECL_INITIAL (decl) = error_mark_node;
2648 /* If this is a function declaration, write a record describing it to the
2649 prototypes file (if requested). */
2651 if (TREE_CODE (decl) == FUNCTION_DECL)
2652 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2654 /* ANSI specifies that a tentative definition which is not merged with
2655 a non-tentative definition behaves exactly like a definition with an
2656 initializer equal to zero. (Section 3.7.2)
2658 -fno-common gives strict ANSI behavior, though this tends to break
2659 a large body of code that grew up without this rule.
2661 Thread-local variables are never common, since there's no entrenched
2662 body of code to break, and it allows more efficient variable references
2663 in the presence of dynamic linking. */
2665 if (TREE_CODE (decl) == VAR_DECL
2667 && TREE_PUBLIC (decl)
2668 && !DECL_THREAD_LOCAL (decl)
2670 DECL_COMMON (decl) = 1;
2672 /* Set attributes here so if duplicate decl, will have proper attributes. */
2673 decl_attributes (&decl, attributes, 0);
2675 if (TREE_CODE (decl) == FUNCTION_DECL
2676 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2678 tree ce = declarator;
2680 if (TREE_CODE (ce) == INDIRECT_REF)
2681 ce = TREE_OPERAND (declarator, 0);
2682 if (TREE_CODE (ce) == CALL_EXPR)
2684 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2685 for (; args; args = TREE_CHAIN (args))
2687 tree type = TREE_TYPE (args);
2688 if (INTEGRAL_TYPE_P (type)
2689 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2690 DECL_ARG_TYPE (args) = integer_type_node;
2695 if (TREE_CODE (decl) == FUNCTION_DECL
2696 && DECL_DECLARED_INLINE_P (decl)
2697 && DECL_UNINLINABLE (decl)
2698 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2699 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2701 /* Add this decl to the current scope.
2702 TEM may equal DECL or it may be a previous decl of the same name. */
2703 tem = pushdecl (decl);
2705 /* For a local variable, define the RTL now. */
2706 if (current_scope != global_scope
2707 /* But not if this is a duplicate decl
2708 and we preserved the rtl from the previous one
2709 (which may or may not happen). */
2710 && !DECL_RTL_SET_P (tem)
2711 && DECL_FILE_SCOPE_P (tem))
2713 if (TREE_TYPE (tem) != error_mark_node
2714 && (COMPLETE_TYPE_P (TREE_TYPE (tem))
2715 || (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2716 && DECL_INITIAL (tem) != 0)))
2723 /* Finish processing of a declaration;
2724 install its initial value.
2725 If the length of an array type is not known before,
2726 it must be determined now, from the initial value, or it is an error. */
2729 finish_decl (tree decl, tree init, tree asmspec_tree)
2731 tree type = TREE_TYPE (decl);
2732 int was_incomplete = (DECL_SIZE (decl) == 0);
2733 const char *asmspec = 0;
2735 /* If a name was specified, get the string. */
2736 if (current_scope == global_scope)
2737 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2739 asmspec = TREE_STRING_POINTER (asmspec_tree);
2741 /* If `start_decl' didn't like having an initialization, ignore it now. */
2742 if (init != 0 && DECL_INITIAL (decl) == 0)
2745 /* Don't crash if parm is initialized. */
2746 if (TREE_CODE (decl) == PARM_DECL)
2750 store_init_value (decl, init);
2752 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
2753 || TREE_CODE (decl) == FUNCTION_DECL
2754 || TREE_CODE (decl) == FIELD_DECL))
2755 objc_check_decl (decl);
2757 /* Deduce size of array from initialization, if not already known */
2758 if (TREE_CODE (type) == ARRAY_TYPE
2759 && TYPE_DOMAIN (type) == 0
2760 && TREE_CODE (decl) != TYPE_DECL)
2763 = (TREE_STATIC (decl)
2764 /* Even if pedantic, an external linkage array
2765 may have incomplete type at first. */
2766 ? pedantic && !TREE_PUBLIC (decl)
2767 : !DECL_EXTERNAL (decl));
2769 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2771 /* Get the completed type made by complete_array_type. */
2772 type = TREE_TYPE (decl);
2775 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2777 else if (failure == 2)
2780 error ("%Jarray size missing in '%D'", decl, decl);
2781 /* If a `static' var's size isn't known,
2782 make it extern as well as static, so it does not get
2784 If it is not `static', then do not mark extern;
2785 finish_incomplete_decl will give it a default size
2786 and it will get allocated. */
2787 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2788 DECL_EXTERNAL (decl) = 1;
2791 /* TYPE_MAX_VALUE is always one less than the number of elements
2792 in the array, because we start counting at zero. Therefore,
2793 warn only if the value is less than zero. */
2794 else if (pedantic && TYPE_DOMAIN (type) != 0
2795 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2796 error ("%Jzero or negative size array '%D'", decl, decl);
2798 layout_decl (decl, 0);
2801 if (TREE_CODE (decl) == VAR_DECL)
2803 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2804 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2805 layout_decl (decl, 0);
2807 if (DECL_SIZE (decl) == 0
2808 /* Don't give an error if we already gave one earlier. */
2809 && TREE_TYPE (decl) != error_mark_node
2810 && (TREE_STATIC (decl)
2812 /* A static variable with an incomplete type
2813 is an error if it is initialized.
2814 Also if it is not file scope.
2815 Otherwise, let it through, but if it is not `extern'
2816 then it may cause an error message later. */
2817 (DECL_INITIAL (decl) != 0
2818 || !DECL_FILE_SCOPE_P (decl))
2820 /* An automatic variable with an incomplete type
2822 !DECL_EXTERNAL (decl)))
2824 error ("%Jstorage size of '%D' isn't known", decl, decl);
2825 TREE_TYPE (decl) = error_mark_node;
2828 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2829 && DECL_SIZE (decl) != 0)
2831 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2832 constant_expression_warning (DECL_SIZE (decl));
2834 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2837 if (TREE_USED (type))
2838 TREE_USED (decl) = 1;
2841 /* If this is a function and an assembler name is specified, reset DECL_RTL
2842 so we can give it its new name. Also, update built_in_decls if it
2843 was a normal built-in. */
2844 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2846 /* ASMSPEC is given, and not the name of a register. Mark the
2847 name with a star so assemble_name won't munge it. */
2848 char *starred = alloca (strlen (asmspec) + 2);
2850 strcpy (starred + 1, asmspec);
2852 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2854 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2855 SET_DECL_RTL (builtin, NULL_RTX);
2856 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2857 #ifdef TARGET_MEM_FUNCTIONS
2858 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2859 init_block_move_fn (starred);
2860 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2861 init_block_clear_fn (starred);
2863 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2864 init_block_move_fn (starred);
2865 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2866 init_block_clear_fn (starred);
2869 SET_DECL_RTL (decl, NULL_RTX);
2870 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (starred));
2873 /* If #pragma weak was used, mark the decl weak now. */
2874 if (current_scope == global_scope)
2875 maybe_apply_pragma_weak (decl);
2877 /* Output the assembler code and/or RTL code for variables and functions,
2878 unless the type is an undefined structure or union.
2879 If not, it will get done when the type is completed. */
2881 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2883 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2884 if (c_dialect_objc ())
2885 objc_check_decl (decl);
2887 if (DECL_FILE_SCOPE_P (decl))
2889 if (DECL_INITIAL (decl) == NULL_TREE
2890 || DECL_INITIAL (decl) == error_mark_node)
2891 /* Don't output anything
2892 when a tentative file-scope definition is seen.
2893 But at end of compilation, do output code for them. */
2894 DECL_DEFER_OUTPUT (decl) = 1;
2895 rest_of_decl_compilation (decl, asmspec, true, 0);
2899 /* This is a local variable. If there is an ASMSPEC, the
2900 user has requested that we handle it specially. */
2903 /* In conjunction with an ASMSPEC, the `register'
2904 keyword indicates that we should place the variable
2905 in a particular register. */
2906 if (DECL_REGISTER (decl))
2907 DECL_C_HARD_REGISTER (decl) = 1;
2909 /* If this is not a static variable, issue a warning.
2910 It doesn't make any sense to give an ASMSPEC for an
2911 ordinary, non-register local variable. Historically,
2912 GCC has accepted -- but ignored -- the ASMSPEC in
2914 if (TREE_CODE (decl) == VAR_DECL
2915 && !DECL_REGISTER (decl)
2916 && !TREE_STATIC (decl))
2917 warning ("%Jignoring asm-specifier for non-static local "
2918 "variable '%D'", decl, decl);
2920 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
2923 if (TREE_CODE (decl) != FUNCTION_DECL)
2924 add_decl_stmt (decl);
2927 if (!DECL_FILE_SCOPE_P (decl))
2929 /* Recompute the RTL of a local array now
2930 if it used to be an incomplete type. */
2932 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2934 /* If we used it already as memory, it must stay in memory. */
2935 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2936 /* If it's still incomplete now, no init will save it. */
2937 if (DECL_SIZE (decl) == 0)
2938 DECL_INITIAL (decl) = 0;
2943 /* If this was marked 'used', be sure it will be output. */
2944 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2945 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2947 if (TREE_CODE (decl) == TYPE_DECL)
2948 rest_of_decl_compilation (decl, NULL, DECL_FILE_SCOPE_P (decl), 0);
2950 /* At the end of a declaration, throw away any variable type sizes
2951 of types defined inside that declaration. There is no use
2952 computing them in the following function definition. */
2953 if (current_scope == global_scope)
2954 get_pending_sizes ();
2956 /* Install a cleanup (aka destructor) if one was given. */
2957 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2959 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2962 static bool eh_initialized_p;
2964 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2965 tree cleanup_decl = lookup_name (cleanup_id);
2968 /* Build "cleanup(&decl)" for the destructor. */
2969 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2970 cleanup = build_tree_list (NULL_TREE, cleanup);
2971 cleanup = build_function_call (cleanup_decl, cleanup);
2973 /* Don't warn about decl unused; the cleanup uses it. */
2974 TREE_USED (decl) = 1;
2976 /* Initialize EH, if we've been told to do so. */
2977 if (flag_exceptions && !eh_initialized_p)
2979 eh_initialized_p = true;
2980 eh_personality_libfunc
2981 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
2982 ? "__gcc_personality_sj0"
2983 : "__gcc_personality_v0");
2984 using_eh_for_cleanups ();
2987 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
2992 /* Given a parsed parameter declaration, decode it into a PARM_DECL
2993 and push that on the current scope. */
2996 push_parm_decl (tree parm)
3000 /* Don't attempt to expand sizes while parsing this decl.
3001 (We can get here with i_s_e 1 somehow from Objective-C.) */
3002 int save_immediate_size_expand = immediate_size_expand;
3003 immediate_size_expand = 0;
3005 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3006 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3007 decl_attributes (&decl, TREE_VALUE (parm), 0);
3009 decl = pushdecl (decl);
3011 finish_decl (decl, NULL_TREE, NULL_TREE);
3013 immediate_size_expand = save_immediate_size_expand;
3016 /* Mark all the parameter declarations to date as forward decls,
3017 shift them to the variables list, and reset the parameters list.
3018 Also diagnose use of this extension. */
3021 mark_forward_parm_decls (void)
3025 if (pedantic && !current_scope->warned_forward_parm_decls)
3027 pedwarn ("ISO C forbids forward parameter declarations");
3028 current_scope->warned_forward_parm_decls = true;
3031 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
3032 TREE_ASM_WRITTEN (parm) = 1;
3034 SCOPE_LIST_CONCAT (current_scope, names, current_scope, parms);
3035 current_scope->parms = 0;
3036 current_scope->parms_last = 0;
3039 static GTY(()) int compound_literal_number;
3041 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3042 literal, which may be an incomplete array type completed by the
3043 initializer; INIT is a CONSTRUCTOR that initializes the compound
3047 build_compound_literal (tree type, tree init)
3049 /* We do not use start_decl here because we have a type, not a declarator;
3050 and do not use finish_decl because the decl should be stored inside
3051 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3052 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3055 DECL_EXTERNAL (decl) = 0;
3056 TREE_PUBLIC (decl) = 0;
3057 TREE_STATIC (decl) = (current_scope == global_scope);
3058 DECL_CONTEXT (decl) = current_function_decl;
3059 TREE_USED (decl) = 1;
3060 TREE_TYPE (decl) = type;
3061 TREE_READONLY (decl) = TREE_READONLY (type);
3062 store_init_value (decl, init);
3064 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3066 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3071 type = TREE_TYPE (decl);
3072 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3073 return error_mark_node;
3075 stmt = build_stmt (DECL_STMT, decl);
3076 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3077 TREE_SIDE_EFFECTS (complit) = 1;
3079 layout_decl (decl, 0);
3081 if (TREE_STATIC (decl))
3083 /* This decl needs a name for the assembler output. We also need
3084 a unique suffix to be added to the name. */
3087 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3088 compound_literal_number);
3089 compound_literal_number++;
3090 DECL_NAME (decl) = get_identifier (name);
3091 DECL_DEFER_OUTPUT (decl) = 1;
3092 DECL_COMDAT (decl) = 1;
3093 DECL_ARTIFICIAL (decl) = 1;
3095 rest_of_decl_compilation (decl, NULL, 1, 0);
3101 /* Make TYPE a complete type based on INITIAL_VALUE.
3102 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3103 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3106 complete_array_type (tree type, tree initial_value, int do_default)
3108 tree maxindex = NULL_TREE;
3113 /* Note MAXINDEX is really the maximum index,
3114 one less than the size. */
3115 if (TREE_CODE (initial_value) == STRING_CST)
3118 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3119 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3122 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3124 tree elts = CONSTRUCTOR_ELTS (initial_value);
3125 maxindex = build_int_2 (-1, -1);
3126 for (; elts; elts = TREE_CHAIN (elts))
3128 if (TREE_PURPOSE (elts))
3129 maxindex = TREE_PURPOSE (elts);
3131 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3132 maxindex, integer_one_node));
3134 maxindex = copy_node (maxindex);
3138 /* Make an error message unless that happened already. */
3139 if (initial_value != error_mark_node)
3142 /* Prevent further error messages. */
3143 maxindex = build_int_2 (0, 0);
3150 maxindex = build_int_2 (0, 0);
3156 TYPE_DOMAIN (type) = build_index_type (maxindex);
3157 if (!TREE_TYPE (maxindex))
3158 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3161 /* Lay out the type now that we can get the real answer. */
3168 /* Determine whether TYPE is a structure with a flexible array member,
3169 or a union containing such a structure (possibly recursively). */
3172 flexible_array_type_p (tree type)
3175 switch (TREE_CODE (type))
3178 x = TYPE_FIELDS (type);
3181 while (TREE_CHAIN (x) != NULL_TREE)
3183 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3184 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3185 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3186 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3190 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3192 if (flexible_array_type_p (TREE_TYPE (x)))
3201 /* Given declspecs and a declarator,
3202 determine the name and type of the object declared
3203 and construct a ..._DECL node for it.
3204 (In one case we can return a ..._TYPE node instead.
3205 For invalid input we sometimes return 0.)
3207 DECLSPECS is a chain of tree_list nodes whose value fields
3208 are the storage classes and type specifiers.
3210 DECL_CONTEXT says which syntactic context this declaration is in:
3211 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3212 FUNCDEF for a function definition. Like NORMAL but a few different
3213 error messages in each case. Return value may be zero meaning
3214 this definition is too screwy to try to parse.
3215 PARM for a parameter declaration (either within a function prototype
3216 or before a function body). Make a PARM_DECL, or return void_type_node.
3217 TYPENAME if for a typename (in a cast or sizeof).
3218 Don't make a DECL node; just return the ..._TYPE node.
3219 FIELD for a struct or union field; make a FIELD_DECL.
3220 BITFIELD for a field with specified width.
3221 INITIALIZED is 1 if the decl has an initializer.
3223 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3224 It may also be so in the PARM case, for a prototype where the
3225 argument type is specified but not the name.
3227 This function is where the complicated C meanings of `static'
3228 and `extern' are interpreted. */
3231 grokdeclarator (tree declarator, tree declspecs,
3232 enum decl_context decl_context, int initialized)
3236 tree type = NULL_TREE;
3241 int type_quals = TYPE_UNQUALIFIED;
3243 int explicit_int = 0;
3244 int explicit_char = 0;
3245 int defaulted_int = 0;
3246 tree typedef_decl = 0;
3248 tree typedef_type = 0;
3249 int funcdef_flag = 0;
3250 enum tree_code innermost_code = ERROR_MARK;
3252 int size_varies = 0;
3253 tree decl_attr = NULL_TREE;
3254 tree array_ptr_quals = NULL_TREE;
3255 int array_parm_static = 0;
3256 tree returned_attrs = NULL_TREE;
3258 if (decl_context == BITFIELD)
3259 bitfield = 1, decl_context = FIELD;
3261 if (decl_context == FUNCDEF)
3262 funcdef_flag = 1, decl_context = NORMAL;
3264 /* Look inside a declarator for the name being declared
3265 and get it as a string, for an error message. */
3267 tree decl = declarator;
3271 switch (TREE_CODE (decl))
3276 innermost_code = TREE_CODE (decl);
3277 decl = TREE_OPERAND (decl, 0);
3281 decl = TREE_VALUE (decl);
3284 case IDENTIFIER_NODE:
3285 name = IDENTIFIER_POINTER (decl);
3296 /* A function definition's declarator must have the form of
3297 a function declarator. */
3299 if (funcdef_flag && innermost_code != CALL_EXPR)
3302 /* If this looks like a function definition, make it one,
3303 even if it occurs where parms are expected.
3304 Then store_parm_decls will reject it and not use it as a parm. */
3305 if (decl_context == NORMAL && !funcdef_flag
3306 && current_scope->parm_flag)
3307 decl_context = PARM;
3309 /* Look through the decl specs and record which ones appear.
3310 Some typespecs are defined as built-in typenames.
3311 Others, the ones that are modifiers of other types,
3312 are represented by bits in SPECBITS: set the bits for
3313 the modifiers that appear. Storage class keywords are also in SPECBITS.
3315 If there is a typedef name or a type, store the type in TYPE.
3316 This includes builtin typedefs such as `int'.
3318 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3319 and did not come from a user typedef.
3321 Set LONGLONG if `long' is mentioned twice. */
3323 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3325 tree id = TREE_VALUE (spec);
3327 /* If the entire declaration is itself tagged as deprecated then
3328 suppress reports of deprecated items. */
3329 if (id && TREE_DEPRECATED (id))
3331 if (deprecated_state != DEPRECATED_SUPPRESS)
3332 warn_deprecated_use (id);
3335 if (id == ridpointers[(int) RID_INT])
3337 if (id == ridpointers[(int) RID_CHAR])
3340 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3342 enum rid i = C_RID_CODE (id);
3343 if ((int) i <= (int) RID_LAST_MODIFIER)
3345 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3348 error ("`long long long' is too long for GCC");
3351 if (pedantic && !flag_isoc99 && ! in_system_header
3353 pedwarn ("ISO C90 does not support `long long'");
3357 else if (specbits & (1 << (int) i))
3359 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3362 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3365 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3368 /* Diagnose "__thread extern". Recall that this list
3369 is in the reverse order seen in the text. */
3371 && (specbits & (1 << (int) RID_EXTERN
3372 | 1 << (int) RID_STATIC)))
3374 if (specbits & 1 << (int) RID_EXTERN)
3375 error ("`__thread' before `extern'");
3377 error ("`__thread' before `static'");
3380 specbits |= 1 << (int) i;
3385 error ("two or more data types in declaration of `%s'", name);
3386 /* Actual typedefs come to us as TYPE_DECL nodes. */
3387 else if (TREE_CODE (id) == TYPE_DECL)
3389 if (TREE_TYPE (id) == error_mark_node)
3390 ; /* Allow the type to default to int to avoid cascading errors. */
3393 type = TREE_TYPE (id);
3394 decl_attr = DECL_ATTRIBUTES (id);
3398 /* Built-in types come as identifiers. */
3399 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3401 tree t = lookup_name (id);
3402 if (TREE_TYPE (t) == error_mark_node)
3404 else if (!t || TREE_CODE (t) != TYPE_DECL)
3405 error ("`%s' fails to be a typedef or built in type",
3406 IDENTIFIER_POINTER (id));
3409 type = TREE_TYPE (t);
3413 else if (TREE_CODE (id) != ERROR_MARK)
3420 typedef_type = type;
3422 size_varies = C_TYPE_VARIABLE_SIZE (type);
3424 /* No type at all: default to `int', and set DEFAULTED_INT
3425 because it was not a user-defined typedef. */
3429 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3430 | (1 << (int) RID_SIGNED)
3431 | (1 << (int) RID_UNSIGNED)
3432 | (1 << (int) RID_COMPLEX))))
3433 /* Don't warn about typedef foo = bar. */
3434 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3435 && ! in_system_header)
3437 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3438 and this is a function, or if -Wimplicit; prefer the former
3439 warning since it is more explicit. */
3440 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3442 warn_about_return_type = 1;
3443 else if (warn_implicit_int || flag_isoc99)
3444 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3449 type = integer_type_node;
3452 /* Now process the modifiers that were specified
3453 and check for invalid combinations. */
3455 /* Long double is a special combination. */
3457 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3458 && TYPE_MAIN_VARIANT (type) == double_type_node)
3460 specbits &= ~(1 << (int) RID_LONG);
3461 type = long_double_type_node;
3464 /* Check all other uses of type modifiers. */
3466 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3467 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3471 if ((specbits & 1 << (int) RID_LONG)
3472 && (specbits & 1 << (int) RID_SHORT))
3473 error ("both long and short specified for `%s'", name);
3474 else if (((specbits & 1 << (int) RID_LONG)
3475 || (specbits & 1 << (int) RID_SHORT))
3477 error ("long or short specified with char for `%s'", name);
3478 else if (((specbits & 1 << (int) RID_LONG)
3479 || (specbits & 1 << (int) RID_SHORT))
3480 && TREE_CODE (type) == REAL_TYPE)
3482 static int already = 0;
3484 error ("long or short specified with floating type for `%s'", name);
3485 if (! already && ! pedantic)
3487 error ("the only valid combination is `long double'");
3491 else if ((specbits & 1 << (int) RID_SIGNED)
3492 && (specbits & 1 << (int) RID_UNSIGNED))
3493 error ("both signed and unsigned specified for `%s'", name);
3494 else if (TREE_CODE (type) != INTEGER_TYPE)
3495 error ("long, short, signed or unsigned invalid for `%s'", name);
3499 if (!explicit_int && !defaulted_int && !explicit_char)
3501 error ("long, short, signed or unsigned used invalidly for `%s'",
3507 /* Discard the type modifiers if they are invalid. */
3510 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3511 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3516 if ((specbits & (1 << (int) RID_COMPLEX))
3517 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3519 error ("complex invalid for `%s'", name);
3520 specbits &= ~(1 << (int) RID_COMPLEX);
3523 /* Decide whether an integer type is signed or not.
3524 Optionally treat bitfields as signed by default. */
3525 if (specbits & 1 << (int) RID_UNSIGNED
3526 || (bitfield && ! flag_signed_bitfields
3527 && (explicit_int || defaulted_int || explicit_char
3528 /* A typedef for plain `int' without `signed'
3529 can be controlled just like plain `int'. */
3530 || ! (typedef_decl != 0
3531 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3532 && TREE_CODE (type) != ENUMERAL_TYPE
3533 && !(specbits & 1 << (int) RID_SIGNED)))
3536 type = long_long_unsigned_type_node;
3537 else if (specbits & 1 << (int) RID_LONG)
3538 type = long_unsigned_type_node;
3539 else if (specbits & 1 << (int) RID_SHORT)
3540 type = short_unsigned_type_node;
3541 else if (type == char_type_node)
3542 type = unsigned_char_type_node;
3543 else if (typedef_decl)
3544 type = c_common_unsigned_type (type);
3546 type = unsigned_type_node;
3548 else if ((specbits & 1 << (int) RID_SIGNED)
3549 && type == char_type_node)
3550 type = signed_char_type_node;
3552 type = long_long_integer_type_node;
3553 else if (specbits & 1 << (int) RID_LONG)
3554 type = long_integer_type_node;
3555 else if (specbits & 1 << (int) RID_SHORT)
3556 type = short_integer_type_node;
3558 if (specbits & 1 << (int) RID_COMPLEX)
3560 if (pedantic && !flag_isoc99)
3561 pedwarn ("ISO C90 does not support complex types");
3562 /* If we just have "complex", it is equivalent to
3563 "complex double", but if any modifiers at all are specified it is
3564 the complex form of TYPE. E.g, "complex short" is
3565 "complex short int". */
3567 if (defaulted_int && ! longlong
3568 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3569 | (1 << (int) RID_SIGNED)
3570 | (1 << (int) RID_UNSIGNED))))
3573 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3574 type = complex_double_type_node;
3576 else if (type == integer_type_node)
3579 pedwarn ("ISO C does not support complex integer types");
3580 type = complex_integer_type_node;
3582 else if (type == float_type_node)
3583 type = complex_float_type_node;
3584 else if (type == double_type_node)
3585 type = complex_double_type_node;
3586 else if (type == long_double_type_node)
3587 type = complex_long_double_type_node;
3591 pedwarn ("ISO C does not support complex integer types");
3592 type = build_complex_type (type);
3596 /* Figure out the type qualifiers for the declaration. There are
3597 two ways a declaration can become qualified. One is something
3598 like `const int i' where the `const' is explicit. Another is
3599 something like `typedef const int CI; CI i' where the type of the
3600 declaration contains the `const'. */
3601 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3602 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
3603 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3604 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3605 if (constp > 1 && ! flag_isoc99)
3606 pedwarn ("duplicate `const'");
3607 if (restrictp > 1 && ! flag_isoc99)
3608 pedwarn ("duplicate `restrict'");
3609 if (volatilep > 1 && ! flag_isoc99)
3610 pedwarn ("duplicate `volatile'");
3611 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3612 type = TYPE_MAIN_VARIANT (type);
3613 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3614 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3615 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3617 /* Warn if two storage classes are given. Default to `auto'. */
3622 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3623 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3624 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3625 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3626 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3628 /* "static __thread" and "extern __thread" are allowed. */
3629 if ((specbits & (1 << (int) RID_THREAD
3630 | 1 << (int) RID_STATIC
3631 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3634 /* Warn about storage classes that are invalid for certain
3635 kinds of declarations (parameters, typenames, etc.). */
3638 error ("multiple storage classes in declaration of `%s'", name);
3639 else if (funcdef_flag
3641 & ((1 << (int) RID_REGISTER)
3642 | (1 << (int) RID_AUTO)
3643 | (1 << (int) RID_TYPEDEF)
3644 | (1 << (int) RID_THREAD))))
3646 if (specbits & 1 << (int) RID_AUTO
3647 && (pedantic || current_scope == global_scope))
3648 pedwarn ("function definition declared `auto'");
3649 if (specbits & 1 << (int) RID_REGISTER)
3650 error ("function definition declared `register'");
3651 if (specbits & 1 << (int) RID_TYPEDEF)
3652 error ("function definition declared `typedef'");
3653 if (specbits & 1 << (int) RID_THREAD)
3654 error ("function definition declared `__thread'");
3655 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3656 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3658 else if (decl_context != NORMAL && nclasses > 0)
3660 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3664 switch (decl_context)
3667 error ("storage class specified for structure field `%s'",
3671 error ("storage class specified for parameter `%s'", name);
3674 error ("storage class specified for typename");
3677 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3678 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3679 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3682 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3684 /* `extern' with initialization is invalid if not at file scope. */
3685 if (current_scope == global_scope)
3686 warning ("`%s' initialized and declared `extern'", name);
3688 error ("`%s' has both `extern' and initializer", name);
3690 else if (current_scope == global_scope)
3692 if (specbits & 1 << (int) RID_AUTO)
3693 error ("file-scope declaration of `%s' specifies `auto'", name);
3697 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3698 error ("nested function `%s' declared `extern'", name);
3699 else if ((specbits & (1 << (int) RID_THREAD
3700 | 1 << (int) RID_EXTERN
3701 | 1 << (int) RID_STATIC))
3702 == (1 << (int) RID_THREAD))
3704 error ("function-scope `%s' implicitly auto and declared `__thread'",
3706 specbits &= ~(1 << (int) RID_THREAD);
3711 /* Now figure out the structure of the declarator proper.
3712 Descend through it, creating more complex types, until we reach
3713 the declared identifier (or NULL_TREE, in an absolute declarator). */
3715 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3717 if (type == error_mark_node)
3719 declarator = TREE_OPERAND (declarator, 0);
3723 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3724 an INDIRECT_REF (for *...),
3725 a CALL_EXPR (for ...(...)),
3726 a TREE_LIST (for nested attributes),
3727 an identifier (for the name being declared)
3728 or a null pointer (for the place in an absolute declarator
3729 where the name was omitted).
3730 For the last two cases, we have just exited the loop.
3732 At this point, TYPE is the type of elements of an array,
3733 or for a function to return, or for a pointer to point to.
3734 After this sequence of ifs, TYPE is the type of the
3735 array or function or pointer, and DECLARATOR has had its
3736 outermost layer removed. */
3738 if (array_ptr_quals != NULL_TREE || array_parm_static)
3740 /* Only the innermost declarator (making a parameter be of
3741 array type which is converted to pointer type)
3742 may have static or type qualifiers. */
3743 error ("static or type qualifiers in non-parameter array declarator");
3744 array_ptr_quals = NULL_TREE;
3745 array_parm_static = 0;
3748 if (TREE_CODE (declarator) == TREE_LIST)
3750 /* We encode a declarator with embedded attributes using
3752 tree attrs = TREE_PURPOSE (declarator);
3755 declarator = TREE_VALUE (declarator);
3756 inner_decl = declarator;
3757 while (inner_decl != NULL_TREE
3758 && TREE_CODE (inner_decl) == TREE_LIST)
3759 inner_decl = TREE_VALUE (inner_decl);
3760 if (inner_decl == NULL_TREE
3761 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3762 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3763 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3764 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3765 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3766 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3767 returned_attrs = decl_attributes (&type,
3768 chainon (returned_attrs, attrs),
3771 else if (TREE_CODE (declarator) == ARRAY_REF)
3773 tree itype = NULL_TREE;
3774 tree size = TREE_OPERAND (declarator, 1);
3775 /* The index is a signed object `sizetype' bits wide. */
3776 tree index_type = c_common_signed_type (sizetype);
3778 array_ptr_quals = TREE_TYPE (declarator);
3779 array_parm_static = TREE_STATIC (declarator);
3781 declarator = TREE_OPERAND (declarator, 0);
3783 /* Check for some types that there cannot be arrays of. */
3785 if (VOID_TYPE_P (type))
3787 error ("declaration of `%s' as array of voids", name);
3788 type = error_mark_node;
3791 if (TREE_CODE (type) == FUNCTION_TYPE)
3793 error ("declaration of `%s' as array of functions", name);
3794 type = error_mark_node;
3797 if (pedantic && flexible_array_type_p (type))
3798 pedwarn ("invalid use of structure with flexible array member");
3800 if (size == error_mark_node)
3801 type = error_mark_node;
3803 if (type == error_mark_node)
3806 /* If size was specified, set ITYPE to a range-type for that size.
3807 Otherwise, ITYPE remains null. finish_decl may figure it out
3808 from an initial value. */
3812 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3813 STRIP_TYPE_NOPS (size);
3815 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3817 error ("size of array `%s' has non-integer type", name);
3818 size = integer_one_node;
3821 if (pedantic && integer_zerop (size))
3822 pedwarn ("ISO C forbids zero-size array `%s'", name);
3824 if (TREE_CODE (size) == INTEGER_CST)
3826 constant_expression_warning (size);
3827 if (tree_int_cst_sgn (size) < 0)
3829 error ("size of array `%s' is negative", name);
3830 size = integer_one_node;
3835 /* Make sure the array size remains visibly nonconstant
3836 even if it is (eg) a const variable with known value. */
3839 if (!flag_isoc99 && pedantic)
3841 if (TREE_CONSTANT (size))
3842 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3845 pedwarn ("ISO C90 forbids variable-size array `%s'",
3850 if (integer_zerop (size))
3852 /* A zero-length array cannot be represented with an
3853 unsigned index type, which is what we'll get with
3854 build_index_type. Create an open-ended range instead. */
3855 itype = build_range_type (sizetype, size, NULL_TREE);
3859 /* Compute the maximum valid index, that is, size - 1.
3860 Do the calculation in index_type, so that if it is
3861 a variable the computations will be done in the
3863 itype = fold (build (MINUS_EXPR, index_type,
3864 convert (index_type, size),
3865 convert (index_type, size_one_node)));
3867 /* If that overflowed, the array is too big.
3868 ??? While a size of INT_MAX+1 technically shouldn't
3869 cause an overflow (because we subtract 1), the overflow
3870 is recorded during the conversion to index_type, before
3871 the subtraction. Handling this case seems like an
3872 unnecessary complication. */
3873 if (TREE_OVERFLOW (itype))
3875 error ("size of array `%s' is too large", name);
3876 type = error_mark_node;
3882 /* We must be able to distinguish the
3883 SAVE_EXPR_CONTEXT for the variably-sized type
3884 so that we can set it correctly in
3885 set_save_expr_context. The convention is
3886 that all SAVE_EXPRs that need to be reset
3887 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3888 tree cfd = current_function_decl;
3889 if (decl_context == PARM)
3890 current_function_decl = NULL_TREE;
3891 itype = variable_size (itype);
3892 if (decl_context == PARM)
3893 current_function_decl = cfd;
3895 itype = build_index_type (itype);
3898 else if (decl_context == FIELD)
3900 if (pedantic && !flag_isoc99 && !in_system_header)
3901 pedwarn ("ISO C90 does not support flexible array members");
3903 /* ISO C99 Flexible array members are effectively identical
3904 to GCC's zero-length array extension. */
3905 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3908 /* If pedantic, complain about arrays of incomplete types. */
3910 if (pedantic && !COMPLETE_TYPE_P (type))
3911 pedwarn ("array type has incomplete element type");
3913 /* Build the array type itself, then merge any constancy or
3914 volatility into the target type. We must do it in this order
3915 to ensure that the TYPE_MAIN_VARIANT field of the array type
3916 is set correctly. */
3918 type = build_array_type (type, itype);
3920 type = c_build_qualified_type (type, type_quals);
3923 C_TYPE_VARIABLE_SIZE (type) = 1;
3925 /* The GCC extension for zero-length arrays differs from
3926 ISO flexible array members in that sizeof yields zero. */
3927 if (size && integer_zerop (size))
3930 TYPE_SIZE (type) = bitsize_zero_node;
3931 TYPE_SIZE_UNIT (type) = size_zero_node;
3933 if (decl_context != PARM
3934 && (array_ptr_quals != NULL_TREE || array_parm_static))
3936 error ("static or type qualifiers in non-parameter array declarator");
3937 array_ptr_quals = NULL_TREE;
3938 array_parm_static = 0;
3941 else if (TREE_CODE (declarator) == CALL_EXPR)
3945 /* Declaring a function type.
3946 Make sure we have a valid type for the function to return. */
3947 if (type == error_mark_node)
3952 /* Warn about some types functions can't return. */
3954 if (TREE_CODE (type) == FUNCTION_TYPE)
3956 error ("`%s' declared as function returning a function", name);
3957 type = integer_type_node;
3959 if (TREE_CODE (type) == ARRAY_TYPE)
3961 error ("`%s' declared as function returning an array", name);
3962 type = integer_type_node;
3965 /* Construct the function type and go to the next
3966 inner layer of declarator. */
3968 arg_types = grokparms (TREE_OPERAND (declarator, 1),
3970 /* Say it's a definition
3971 only for the CALL_EXPR
3972 closest to the identifier. */
3973 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
3974 /* Type qualifiers before the return type of the function
3975 qualify the return type, not the function type. */
3978 /* Type qualifiers on a function return type are normally
3979 permitted by the standard but have no effect, so give a
3980 warning at -Wextra. Qualifiers on a void return type have
3981 meaning as a GNU extension, and are banned on function
3982 definitions in ISO C. FIXME: strictly we shouldn't
3983 pedwarn for qualified void return types except on function
3984 definitions, but not doing so could lead to the undesirable
3985 state of a "volatile void" function return type not being
3986 warned about, and a use of the function being compiled
3987 with GNU semantics, with no diagnostics under -pedantic. */
3988 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
3989 pedwarn ("ISO C forbids qualified void function return type");
3990 else if (extra_warnings
3991 && !(VOID_TYPE_P (type)
3992 && type_quals == TYPE_QUAL_VOLATILE))
3993 warning ("type qualifiers ignored on function return type");
3995 type = c_build_qualified_type (type, type_quals);
3997 type_quals = TYPE_UNQUALIFIED;
3999 type = build_function_type (type, arg_types);
4000 declarator = TREE_OPERAND (declarator, 0);
4002 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4003 the formal parameter list of this FUNCTION_TYPE to point to
4004 the FUNCTION_TYPE node itself. */
4009 for (link = last_function_parm_tags;
4011 link = TREE_CHAIN (link))
4012 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4015 else if (TREE_CODE (declarator) == INDIRECT_REF)
4017 /* Merge any constancy or volatility into the target type
4020 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4022 pedwarn ("ISO C forbids qualified function types");
4024 type = c_build_qualified_type (type, type_quals);
4025 type_quals = TYPE_UNQUALIFIED;
4028 type = build_pointer_type (type);
4030 /* Process a list of type modifier keywords
4031 (such as const or volatile) that were given inside the `*'. */
4033 if (TREE_TYPE (declarator))
4041 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4042 typemodlist = TREE_CHAIN (typemodlist))
4044 tree qualifier = TREE_VALUE (typemodlist);
4046 if (C_IS_RESERVED_WORD (qualifier))
4048 if (C_RID_CODE (qualifier) == RID_CONST)
4050 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4052 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4062 error ("invalid type modifier within pointer declarator");
4063 if (constp > 1 && ! flag_isoc99)
4064 pedwarn ("duplicate `const'");
4065 if (volatilep > 1 && ! flag_isoc99)
4066 pedwarn ("duplicate `volatile'");
4067 if (restrictp > 1 && ! flag_isoc99)
4068 pedwarn ("duplicate `restrict'");
4070 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4071 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4072 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4075 declarator = TREE_OPERAND (declarator, 0);
4082 /* Now TYPE has the actual type. */
4084 /* Did array size calculations overflow? */
4086 if (TREE_CODE (type) == ARRAY_TYPE
4087 && COMPLETE_TYPE_P (type)
4088 && TREE_OVERFLOW (TYPE_SIZE (type)))
4090 error ("size of array `%s' is too large", name);
4091 /* If we proceed with the array type as it is, we'll eventually
4092 crash in tree_low_cst(). */
4093 type = error_mark_node;
4096 /* If this is declaring a typedef name, return a TYPE_DECL. */
4098 if (specbits & (1 << (int) RID_TYPEDEF))
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 qualified function types");
4107 type = c_build_qualified_type (type, type_quals);
4108 decl = build_decl (TYPE_DECL, declarator, type);
4109 if ((specbits & (1 << (int) RID_SIGNED))
4110 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4111 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4112 decl_attributes (&decl, returned_attrs, 0);
4116 /* Detect the case of an array type of unspecified size
4117 which came, as such, direct from a typedef name.
4118 We must copy the type, so that each identifier gets
4119 a distinct type, so that each identifier's size can be
4120 controlled separately by its own initializer. */
4122 if (type != 0 && typedef_type != 0
4123 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4124 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4126 type = build_array_type (TREE_TYPE (type), 0);
4128 C_TYPE_VARIABLE_SIZE (type) = 1;
4131 /* If this is a type name (such as, in a cast or sizeof),
4132 compute the type and return it now. */
4134 if (decl_context == TYPENAME)
4136 /* Note that the grammar rejects storage classes
4137 in typenames, fields or parameters */
4138 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4140 pedwarn ("ISO C forbids const or volatile function types");
4142 type = c_build_qualified_type (type, type_quals);
4143 decl_attributes (&type, returned_attrs, 0);
4147 /* Aside from typedefs and type names (handle above),
4148 `void' at top level (not within pointer)
4149 is allowed only in public variables.
4150 We don't complain about parms either, but that is because
4151 a better error message can be made later. */
4153 if (VOID_TYPE_P (type) && decl_context != PARM
4154 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4155 && ((specbits & (1 << (int) RID_EXTERN))
4156 || (current_scope == global_scope
4158 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4160 error ("variable or field `%s' declared void", name);
4161 type = integer_type_node;
4164 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4165 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4170 if (decl_context == PARM)
4172 tree type_as_written;
4175 /* A parameter declared as an array of T is really a pointer to T.
4176 One declared as a function is really a pointer to a function. */
4178 if (TREE_CODE (type) == ARRAY_TYPE)
4180 /* Transfer const-ness of array into that of type pointed to. */
4181 type = TREE_TYPE (type);
4183 type = c_build_qualified_type (type, type_quals);
4184 type = build_pointer_type (type);
4185 type_quals = TYPE_UNQUALIFIED;
4186 if (array_ptr_quals)
4188 tree new_ptr_quals, new_ptr_attrs;
4190 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4191 /* We don't yet implement attributes in this context. */
4192 if (new_ptr_attrs != NULL_TREE)
4193 warning ("attributes in parameter array declarator ignored");
4198 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4200 tree qualifier = TREE_VALUE (new_ptr_quals);
4202 if (C_IS_RESERVED_WORD (qualifier))
4204 if (C_RID_CODE (qualifier) == RID_CONST)
4206 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4208 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4218 error ("invalid type modifier within array declarator");
4220 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4221 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4222 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4226 else if (TREE_CODE (type) == FUNCTION_TYPE)
4228 if (pedantic && type_quals)
4229 pedwarn ("ISO C forbids qualified function types");
4231 type = c_build_qualified_type (type, type_quals);
4232 type = build_pointer_type (type);
4233 type_quals = TYPE_UNQUALIFIED;
4235 else if (type_quals)
4236 type = c_build_qualified_type (type, type_quals);
4238 type_as_written = type;
4240 decl = build_decl (PARM_DECL, declarator, type);
4242 C_DECL_VARIABLE_SIZE (decl) = 1;
4244 /* Compute the type actually passed in the parmlist,
4245 for the case where there is no prototype.
4246 (For example, shorts and chars are passed as ints.)
4247 When there is a prototype, this is overridden later. */
4249 if (type == error_mark_node)
4250 promoted_type = type;
4252 promoted_type = c_type_promotes_to (type);
4254 DECL_ARG_TYPE (decl) = promoted_type;
4255 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4257 else if (decl_context == FIELD)
4259 /* Structure field. It may not be a function. */
4261 if (TREE_CODE (type) == FUNCTION_TYPE)
4263 error ("field `%s' declared as a function", name);
4264 type = build_pointer_type (type);
4266 else if (TREE_CODE (type) != ERROR_MARK
4267 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4269 error ("field `%s' has incomplete type", name);
4270 type = error_mark_node;
4272 /* Move type qualifiers down to element of an array. */
4273 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4274 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4276 TYPE_DOMAIN (type));
4277 decl = build_decl (FIELD_DECL, declarator, type);
4278 DECL_NONADDRESSABLE_P (decl) = bitfield;
4281 C_DECL_VARIABLE_SIZE (decl) = 1;
4283 else if (TREE_CODE (type) == FUNCTION_TYPE)
4285 /* Every function declaration is "external"
4286 except for those which are inside a function body
4287 in which `auto' is used.
4288 That is a case not specified by ANSI C,
4289 and we use it for forward declarations for nested functions. */
4290 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4291 || current_scope == global_scope);
4293 if (specbits & (1 << (int) RID_AUTO)
4294 && (pedantic || current_scope == global_scope))
4295 pedwarn ("invalid storage class for function `%s'", name);
4296 if (specbits & (1 << (int) RID_REGISTER))
4297 error ("invalid storage class for function `%s'", name);
4298 if (specbits & (1 << (int) RID_THREAD))
4299 error ("invalid storage class for function `%s'", name);
4300 /* Function declaration not at file scope.
4301 Storage classes other than `extern' are not allowed
4302 and `extern' makes no difference. */
4303 if (current_scope != global_scope
4304 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4306 pedwarn ("invalid storage class for function `%s'", name);
4308 decl = build_decl (FUNCTION_DECL, declarator, type);
4309 decl = build_decl_attribute_variant (decl, decl_attr);
4311 DECL_LANG_SPECIFIC (decl)
4312 = ggc_alloc_cleared (sizeof (struct lang_decl));
4314 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4315 pedwarn ("ISO C forbids qualified function types");
4317 /* GNU C interprets a `volatile void' return type to indicate
4318 that the function does not return. */
4319 if ((type_quals & TYPE_QUAL_VOLATILE)
4320 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4321 warning ("`noreturn' function returns non-void value");
4324 DECL_EXTERNAL (decl) = 1;
4325 /* Record absence of global scope for `static' or `auto'. */
4327 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4330 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4332 /* Record presence of `inline', if it is reasonable. */
4333 if (MAIN_NAME_P (declarator))
4336 warning ("cannot inline function `main'");
4340 /* Record that the function is declared `inline'. */
4341 DECL_DECLARED_INLINE_P (decl) = 1;
4343 /* Do not mark bare declarations as DECL_INLINE. Doing so
4344 in the presence of multiple declarations can result in
4345 the abstract origin pointing between the declarations,
4346 which will confuse dwarf2out. */
4349 DECL_INLINE (decl) = 1;
4350 if (specbits & (1 << (int) RID_EXTERN))
4351 current_extern_inline = 1;
4354 /* If -finline-functions, assume it can be inlined. This does
4355 two things: let the function be deferred until it is actually
4356 needed, and let dwarf2 know that the function is inlinable. */
4357 else if (flag_inline_trees == 2 && initialized)
4358 DECL_INLINE (decl) = 1;
4362 /* It's a variable. */
4363 /* An uninitialized decl with `extern' is a reference. */
4364 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4366 /* Move type qualifiers down to element of an array. */
4367 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4369 int saved_align = TYPE_ALIGN(type);
4370 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4372 TYPE_DOMAIN (type));
4373 TYPE_ALIGN (type) = saved_align;
4375 else if (type_quals)
4376 type = c_build_qualified_type (type, type_quals);
4378 /* It is invalid to create an `extern' declaration for a
4379 variable if there is a global declaration that is
4381 if (extern_ref && current_scope != global_scope)
4385 global_decl = identifier_global_value (declarator);
4387 && TREE_CODE (global_decl) == VAR_DECL
4388 && !TREE_PUBLIC (global_decl))
4389 error ("variable previously declared `static' redeclared "
4393 decl = build_decl (VAR_DECL, declarator, type);
4395 C_DECL_VARIABLE_SIZE (decl) = 1;
4398 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4400 DECL_EXTERNAL (decl) = extern_ref;
4402 /* At file scope, the presence of a `static' or `register' storage
4403 class specifier, or the absence of all storage class specifiers
4404 makes this declaration a definition (perhaps tentative). Also,
4405 the absence of both `static' and `register' makes it public. */
4406 if (current_scope == global_scope)
4408 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4409 | (1 << (int) RID_REGISTER)));
4410 TREE_STATIC (decl) = !extern_ref;
4412 /* Not at file scope, only `static' makes a static definition. */
4415 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4416 TREE_PUBLIC (decl) = extern_ref;
4419 if (specbits & 1 << (int) RID_THREAD)
4421 if (targetm.have_tls)
4422 DECL_THREAD_LOCAL (decl) = 1;
4424 /* A mere warning is sure to result in improper semantics
4425 at runtime. Don't bother to allow this to compile. */
4426 error ("thread-local storage not supported for this target");
4430 /* Record `register' declaration for warnings on &
4431 and in case doing stupid register allocation. */
4433 if (specbits & (1 << (int) RID_REGISTER))
4434 DECL_REGISTER (decl) = 1;
4436 /* Record constancy and volatility. */
4437 c_apply_type_quals_to_decl (type_quals, decl);
4439 /* If a type has volatile components, it should be stored in memory.
4440 Otherwise, the fact that those components are volatile
4441 will be ignored, and would even crash the compiler. */
4442 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4443 c_mark_addressable (decl);
4445 #ifdef ENABLE_CHECKING
4446 /* This is the earliest point at which we might know the assembler
4447 name of a variable. Thus, if it's known before this, die horribly. */
4448 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4452 decl_attributes (&decl, returned_attrs, 0);
4458 /* Decode the parameter-list info for a function type or function definition.
4459 The argument is the value returned by `get_parm_info' (or made in parse.y
4460 if there is an identifier list instead of a parameter decl list).
4461 These two functions are separate because when a function returns
4462 or receives functions then each is called multiple times but the order
4463 of calls is different. The last call to `grokparms' is always the one
4464 that contains the formal parameter names of a function definition.
4466 Store in `last_function_parms' a chain of the decls of parms.
4467 Also store in `last_function_parm_tags' a chain of the struct, union,
4468 and enum tags declared among the parms.
4470 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4472 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4473 a mere declaration. A nonempty identifier-list gets an error message
4474 when FUNCDEF_FLAG is zero. */
4477 grokparms (tree parms_info, int funcdef_flag)
4479 tree first_parm = TREE_CHAIN (parms_info);
4481 last_function_parms = TREE_PURPOSE (parms_info);
4482 last_function_parm_tags = TREE_VALUE (parms_info);
4483 last_function_parm_others = TREE_TYPE (parms_info);
4485 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4486 && !in_system_header)
4487 warning ("function declaration isn't a prototype");
4490 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4493 pedwarn ("parameter names (without types) in function declaration");
4495 last_function_parms = first_parm;
4502 /* If the arg types are incomplete in a declaration,
4503 they must include undefined tags.
4504 These tags can never be defined in the scope of the declaration,
4505 so the types can never be completed,
4506 and no call can be compiled successfully. */
4508 for (parm = last_function_parms, typelt = first_parm;
4510 parm = TREE_CHAIN (parm))
4511 /* Skip over any enumeration constants declared here. */
4512 if (TREE_CODE (parm) == PARM_DECL)
4514 /* Barf if the parameter itself has an incomplete type. */
4515 tree type = TREE_VALUE (typelt);
4516 if (type == error_mark_node)
4518 if (!COMPLETE_TYPE_P (type))
4520 if (funcdef_flag && DECL_NAME (parm) != 0)
4521 error ("parameter `%s' has incomplete type",
4522 IDENTIFIER_POINTER (DECL_NAME (parm)));
4524 warning ("parameter has incomplete type");
4527 TREE_VALUE (typelt) = error_mark_node;
4528 TREE_TYPE (parm) = error_mark_node;
4531 typelt = TREE_CHAIN (typelt);
4538 /* Return a tree_list node with info on a parameter list just parsed.
4539 The TREE_PURPOSE is a list of decls of those parms.
4540 The TREE_VALUE is a list of structure, union and enum tags defined.
4541 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4542 The TREE_TYPE is a list of non-parameter decls which appeared with the
4544 This tree_list node is later fed to `grokparms'.
4546 VOID_AT_END nonzero means append `void' to the end of the type-list.
4547 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4550 get_parm_info (int void_at_end)
4552 tree decl, type, list;
4554 tree *last_type = &types;
4555 tree tags = current_scope->tags;
4556 tree parms = current_scope->parms;
4557 tree others = current_scope->names;
4558 static bool explained_incomplete_types = false;
4559 bool gave_void_only_once_err = false;
4561 /* Just "void" (and no ellipsis) is special. There are really no parms.
4562 But if the "void" is qualified (by "const" or "volatile"), or has a
4563 storage class specifier ("register"), then the behavior is undefined;
4564 issue an error. Typedefs for "void" are OK (see DR#157). */
4565 if (void_at_end && parms != 0
4566 && TREE_CHAIN (parms) == 0
4567 && VOID_TYPE_P (TREE_TYPE (parms))
4568 && !DECL_NAME (parms))
4570 if (TREE_THIS_VOLATILE (parms)
4571 || TREE_READONLY (parms)
4572 || DECL_REGISTER (parms))
4573 error ("\"void\" as only parameter may not be qualified");
4575 return tree_cons (0, 0, tree_cons (0, void_type_node, 0));
4578 /* Sanity check all of the parameter declarations. */
4579 for (decl = parms; decl; decl = TREE_CHAIN (decl))
4581 if (TREE_CODE (decl) != PARM_DECL)
4583 if (TREE_ASM_WRITTEN (decl))
4586 /* Since there is a prototype, args are passed in their
4587 declared types. The back end may override this. */
4588 type = TREE_TYPE (decl);
4589 DECL_ARG_TYPE (decl) = type;
4591 /* Check for (..., void, ...) and issue an error. */
4592 if (VOID_TYPE_P (type) && !DECL_NAME (decl) && !gave_void_only_once_err)
4594 error ("\"void\" must be the only parameter");
4595 gave_void_only_once_err = true;
4598 type = build_tree_list (0, type);
4600 last_type = &TREE_CHAIN (type);
4603 /* Check the list of non-parameter decls for any forward parm decls
4604 that never got real decls. */
4605 for (decl = others; decl; decl = TREE_CHAIN (decl))
4606 if (TREE_CODE (decl) == PARM_DECL)
4608 if (!TREE_ASM_WRITTEN (decl))
4611 error ("%Jparameter \"%D\" has just a forward declaration",
4615 /* Warn about any struct, union or enum tags defined within this
4616 list. The scope of such types is limited to this declaration,
4617 which is rarely if ever desirable (it's impossible to call such
4618 a function with type-correct arguments). */
4619 for (decl = tags; decl; decl = TREE_CHAIN (decl))
4621 enum tree_code code = TREE_CODE (TREE_VALUE (decl));
4622 const char *keyword;
4623 /* An anonymous union parm type is meaningful as a GNU extension.
4624 So don't warn for that. */
4625 if (code == UNION_TYPE && TREE_PURPOSE (decl) == 0 && !pedantic)
4628 /* The keyword should not be translated. */
4631 case RECORD_TYPE: keyword = "struct"; break;
4632 case UNION_TYPE: keyword = "union"; break;
4633 case ENUMERAL_TYPE: keyword = "enum"; break;
4637 if (TREE_PURPOSE (decl))
4638 /* The first %s will be one of 'struct', 'union', or 'enum'. */
4639 warning ("\"%s %s\" declared inside parameter list",
4640 keyword, IDENTIFIER_POINTER (TREE_PURPOSE (decl)));
4642 /* The %s will be one of 'struct', 'union', or 'enum'. */
4643 warning ("anonymous %s declared inside parameter list", keyword);
4645 if (! explained_incomplete_types)
4647 warning ("its scope is only this definition or declaration,"
4648 " which is probably not what you want");
4649 explained_incomplete_types = true;
4656 type = build_tree_list (0, void_type_node);
4660 list = tree_cons (parms, tags, types);
4661 TREE_TYPE (list) = others;
4665 /* Get the struct, enum or union (CODE says which) with tag NAME.
4666 Define the tag as a forward-reference if it is not defined. */
4669 xref_tag (enum tree_code code, tree name)
4671 /* If a cross reference is requested, look up the type
4672 already defined for this tag and return it. */
4674 tree ref = lookup_tag (code, name, 0);
4675 /* If this is the right type of tag, return what we found.
4676 (This reference will be shadowed by shadow_tag later if appropriate.)
4677 If this is the wrong type of tag, do not return it. If it was the
4678 wrong type in the same scope, we will have had an error
4679 message already; if in a different scope and declaring
4680 a name, pending_xref_error will give an error message; but if in a
4681 different scope and not declaring a name, this tag should
4682 shadow the previous declaration of a different type of tag, and
4683 this would not work properly if we return the reference found.
4684 (For example, with "struct foo" in an outer scope, "union foo;"
4685 must shadow that tag with a new one of union type.) */
4686 if (ref && TREE_CODE (ref) == code)
4689 /* If no such tag is yet defined, create a forward-reference node
4690 and record it as the "definition".
4691 When a real declaration of this type is found,
4692 the forward-reference will be altered into a real type. */
4694 ref = make_node (code);
4695 if (code == ENUMERAL_TYPE)
4697 /* Give the type a default layout like unsigned int
4698 to avoid crashing if it does not get defined. */
4699 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4700 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4701 TYPE_USER_ALIGN (ref) = 0;
4702 TREE_UNSIGNED (ref) = 1;
4703 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4704 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4705 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4708 pushtag (name, ref);
4713 /* Make sure that the tag NAME is defined *in the current scope*
4714 at least as a forward reference.
4715 CODE says which kind of tag NAME ought to be. */
4718 start_struct (enum tree_code code, tree name)
4720 /* If there is already a tag defined at this scope
4721 (as a forward reference), just return it. */
4726 ref = lookup_tag (code, name, 1);
4727 if (ref && TREE_CODE (ref) == code)
4729 if (TYPE_FIELDS (ref))
4731 if (code == UNION_TYPE)
4732 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4734 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4739 /* Otherwise create a forward-reference just so the tag is in scope. */
4741 ref = make_node (code);
4742 pushtag (name, ref);
4745 C_TYPE_BEING_DEFINED (ref) = 1;
4746 TYPE_PACKED (ref) = flag_pack_struct;
4750 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4751 of a structure component, returning a FIELD_DECL node.
4752 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4754 This is done during the parsing of the struct declaration.
4755 The FIELD_DECL nodes are chained together and the lot of them
4756 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4759 grokfield (tree declarator, tree declspecs, tree width)
4763 if (declarator == NULL_TREE && width == NULL_TREE)
4765 /* This is an unnamed decl.
4767 If we have something of the form "union { list } ;" then this
4768 is the anonymous union extension. Similarly for struct.
4770 If this is something of the form "struct foo;", then
4771 If MS extensions are enabled, this is handled as an
4773 Otherwise this is a forward declaration of a structure tag.
4775 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4776 If MS extensions are enabled and foo names a structure, then
4777 again this is an anonymous struct.
4778 Otherwise this is an error.
4780 Oh what a horrid tangled web we weave. I wonder if MS consciously
4781 took this from Plan 9 or if it was an accident of implementation
4782 that took root before someone noticed the bug... */
4784 tree type = TREE_VALUE (declspecs);
4786 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4787 type = TREE_TYPE (type);
4788 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4790 if (flag_ms_extensions)
4793 goto warn_unnamed_field;
4794 else if (TYPE_NAME (type) == NULL)
4797 goto warn_unnamed_field;
4802 warning ("declaration does not declare anything");
4807 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4809 finish_decl (value, NULL_TREE, NULL_TREE);
4810 DECL_INITIAL (value) = width;
4815 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4816 the list such that this does not present a problem later. */
4819 detect_field_duplicates (tree fieldlist)
4824 /* First, see if there are more than "a few" fields.
4825 This is trivially true if there are zero or one fields. */
4828 x = TREE_CHAIN (fieldlist);
4834 } while (timeout > 0 && x);
4836 /* If there were "few" fields, avoid the overhead of allocating
4837 a hash table. Instead just do the nested traversal thing. */
4840 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4843 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4844 if (DECL_NAME (y) == DECL_NAME (x))
4846 error ("%Jduplicate member '%D'", x, x);
4847 DECL_NAME (x) = NULL_TREE;
4853 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4856 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4857 if ((y = DECL_NAME (x)) != 0)
4859 slot = htab_find_slot (htab, y, INSERT);
4862 error ("%Jduplicate member '%D'", x, x);
4863 DECL_NAME (x) = NULL_TREE;
4872 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4873 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4874 ATTRIBUTES are attributes to be applied to the structure. */
4877 finish_struct (tree t, tree fieldlist, tree attributes)
4880 int toplevel = global_scope == current_scope;
4881 int saw_named_field;
4883 /* If this type was previously laid out as a forward reference,
4884 make sure we lay it out again. */
4888 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4890 /* Nameless union parm types are useful as GCC extension. */
4891 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4892 /* Otherwise, warn about any struct or union def. in parmlist. */
4893 if (in_parm_level_p ())
4896 pedwarn ("%s defined inside parms",
4897 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4899 warning ("%s defined inside parms",
4900 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4905 for (x = fieldlist; x; x = TREE_CHAIN (x))
4906 if (DECL_NAME (x) != 0)
4910 pedwarn ("%s has no %s",
4911 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4912 fieldlist ? _("named members") : _("members"));
4915 /* Install struct as DECL_CONTEXT of each field decl.
4916 Also process specified field sizes,m which is found in the DECL_INITIAL.
4917 Store 0 there, except for ": 0" fields (so we can find them
4918 and delete them, below). */
4920 saw_named_field = 0;
4921 for (x = fieldlist; x; x = TREE_CHAIN (x))
4923 DECL_CONTEXT (x) = t;
4924 DECL_PACKED (x) |= TYPE_PACKED (t);
4926 /* If any field is const, the structure type is pseudo-const. */
4927 if (TREE_READONLY (x))
4928 C_TYPE_FIELDS_READONLY (t) = 1;
4931 /* A field that is pseudo-const makes the structure likewise. */
4932 tree t1 = TREE_TYPE (x);
4933 while (TREE_CODE (t1) == ARRAY_TYPE)
4934 t1 = TREE_TYPE (t1);
4935 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4936 && C_TYPE_FIELDS_READONLY (t1))
4937 C_TYPE_FIELDS_READONLY (t) = 1;
4940 /* Any field that is volatile means variables of this type must be
4941 treated in some ways as volatile. */
4942 if (TREE_THIS_VOLATILE (x))
4943 C_TYPE_FIELDS_VOLATILE (t) = 1;
4945 /* Any field of nominal variable size implies structure is too. */
4946 if (C_DECL_VARIABLE_SIZE (x))
4947 C_TYPE_VARIABLE_SIZE (t) = 1;
4949 /* Detect invalid nested redefinition. */
4950 if (TREE_TYPE (x) == t)
4951 error ("nested redefinition of `%s'",
4952 IDENTIFIER_POINTER (TYPE_NAME (t)));
4954 /* Detect invalid bit-field size. */
4955 if (DECL_INITIAL (x))
4956 STRIP_NOPS (DECL_INITIAL (x));
4957 if (DECL_INITIAL (x))
4959 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
4960 constant_expression_warning (DECL_INITIAL (x));
4963 error ("%Jbit-field '%D' width not an integer constant", x, x);
4964 DECL_INITIAL (x) = NULL;
4968 /* Detect invalid bit-field type. */
4969 if (DECL_INITIAL (x)
4970 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
4971 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
4972 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
4974 error ("%Jbit-field '%D' has invalid type", x, x);
4975 DECL_INITIAL (x) = NULL;
4978 if (DECL_INITIAL (x) && pedantic
4979 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
4980 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
4981 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != boolean_type_node
4982 /* Accept an enum that's equivalent to int or unsigned int. */
4983 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
4984 && (TYPE_PRECISION (TREE_TYPE (x))
4985 == TYPE_PRECISION (integer_type_node))))
4986 pedwarn ("%Jbit-field '%D' type invalid in ISO C", x, x);
4988 /* Detect and ignore out of range field width and process valid
4990 if (DECL_INITIAL (x))
4993 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == boolean_type_node
4994 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
4996 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
4997 error ("%Jnegative width in bit-field '%D'", x, x);
4998 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
4999 pedwarn ("%Jwidth of '%D' exceeds its type", x, x);
5000 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5001 error ("%Jzero width for bit-field '%D'", x, x);
5004 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5005 unsigned HOST_WIDE_INT width
5006 = tree_low_cst (DECL_INITIAL (x), 1);
5008 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5009 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5010 TREE_UNSIGNED (TREE_TYPE (x)))
5012 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5013 TREE_UNSIGNED (TREE_TYPE (x))))))
5014 warning ("%J'%D' is narrower than values of its type", x, x);
5016 DECL_SIZE (x) = bitsize_int (width);
5017 DECL_BIT_FIELD (x) = 1;
5018 SET_DECL_C_BIT_FIELD (x);
5022 DECL_INITIAL (x) = 0;
5024 /* Detect flexible array member in an invalid context. */
5025 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5026 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5027 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5028 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5030 if (TREE_CODE (t) == UNION_TYPE)
5031 error ("%Jflexible array member in union", x);
5032 else if (TREE_CHAIN (x) != NULL_TREE)
5033 error ("%Jflexible array member not at end of struct", x);
5034 else if (! saw_named_field)
5035 error ("%Jflexible array member in otherwise empty struct", x);
5038 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5039 && flexible_array_type_p (TREE_TYPE (x)))
5040 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5043 saw_named_field = 1;
5046 detect_field_duplicates (fieldlist);
5048 /* Now we have the nearly final fieldlist. Record it,
5049 then lay out the structure or union (including the fields). */
5051 TYPE_FIELDS (t) = fieldlist;
5055 /* Delete all zero-width bit-fields from the fieldlist */
5057 tree *fieldlistp = &fieldlist;
5059 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5060 *fieldlistp = TREE_CHAIN (*fieldlistp);
5062 fieldlistp = &TREE_CHAIN (*fieldlistp);
5065 /* Now we have the truly final field list.
5066 Store it in this type and in the variants. */
5068 TYPE_FIELDS (t) = fieldlist;
5070 /* If there are lots of fields, sort so we can look through them fast.
5071 We arbitrarily consider 16 or more elts to be "a lot". */
5076 for (x = fieldlist; x; x = TREE_CHAIN (x))
5078 if (len > 15 || DECL_NAME (x) == NULL)
5086 struct lang_type *space;
5087 struct sorted_fields_type *space2;
5089 len += list_length (x);
5091 /* Use the same allocation policy here that make_node uses, to
5092 ensure that this lives as long as the rest of the struct decl.
5093 All decls in an inline function need to be saved. */
5095 space = ggc_alloc (sizeof (struct lang_type));
5096 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5100 field_array = &space2->elts[0];
5101 for (x = fieldlist; x; x = TREE_CHAIN (x))
5103 field_array[len++] = x;
5105 /* If there is anonymous struct or union, break out of the loop. */
5106 if (DECL_NAME (x) == NULL)
5109 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5112 TYPE_LANG_SPECIFIC (t) = space;
5113 TYPE_LANG_SPECIFIC (t)->s->len = len;
5114 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5115 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5120 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5122 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5123 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5124 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5125 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5128 /* If this was supposed to be a transparent union, but we can't
5129 make it one, warn and turn off the flag. */
5130 if (TREE_CODE (t) == UNION_TYPE
5131 && TYPE_TRANSPARENT_UNION (t)
5132 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5134 TYPE_TRANSPARENT_UNION (t) = 0;
5135 warning ("union cannot be made transparent");
5138 /* If this structure or union completes the type of any previous
5139 variable declaration, lay it out and output its rtl. */
5140 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5144 tree decl = TREE_VALUE (x);
5145 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5146 layout_array_type (TREE_TYPE (decl));
5147 if (TREE_CODE (decl) != TYPE_DECL)
5149 layout_decl (decl, 0);
5150 if (c_dialect_objc ())
5151 objc_check_decl (decl);
5152 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5157 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5159 /* Finish debugging output for this type. */
5160 rest_of_type_compilation (t, toplevel);
5165 /* Lay out the type T, and its element type, and so on. */
5168 layout_array_type (tree t)
5170 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5171 layout_array_type (TREE_TYPE (t));
5175 /* Begin compiling the definition of an enumeration type.
5176 NAME is its name (or null if anonymous).
5177 Returns the type object, as yet incomplete.
5178 Also records info about it so that build_enumerator
5179 may be used to declare the individual values as they are read. */
5182 start_enum (tree name)
5186 /* If this is the real definition for a previous forward reference,
5187 fill in the contents in the same object that used to be the
5188 forward reference. */
5191 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5193 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5195 enumtype = make_node (ENUMERAL_TYPE);
5196 pushtag (name, enumtype);
5199 C_TYPE_BEING_DEFINED (enumtype) = 1;
5201 if (TYPE_VALUES (enumtype) != 0)
5203 /* This enum is a named one that has been declared already. */
5204 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5206 /* Completely replace its old definition.
5207 The old enumerators remain defined, however. */
5208 TYPE_VALUES (enumtype) = 0;
5211 enum_next_value = integer_zero_node;
5214 if (flag_short_enums)
5215 TYPE_PACKED (enumtype) = 1;
5220 /* After processing and defining all the values of an enumeration type,
5221 install their decls in the enumeration type and finish it off.
5222 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5223 and ATTRIBUTES are the specified attributes.
5224 Returns ENUMTYPE. */
5227 finish_enum (tree enumtype, tree values, tree attributes)
5230 tree minnode = 0, maxnode = 0, enum_value_type;
5231 int precision, unsign;
5232 int toplevel = (global_scope == current_scope);
5234 if (in_parm_level_p ())
5235 warning ("enum defined inside parms");
5237 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5239 /* Calculate the maximum value of any enumerator in this type. */
5241 if (values == error_mark_node)
5242 minnode = maxnode = integer_zero_node;
5245 minnode = maxnode = TREE_VALUE (values);
5246 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5248 tree value = TREE_VALUE (pair);
5249 if (tree_int_cst_lt (maxnode, value))
5251 if (tree_int_cst_lt (value, minnode))
5256 /* Construct the final type of this enumeration. It is the same
5257 as one of the integral types - the narrowest one that fits, except
5258 that normally we only go as narrow as int - and signed iff any of
5259 the values are negative. */
5260 unsign = (tree_int_cst_sgn (minnode) >= 0);
5261 precision = MAX (min_precision (minnode, unsign),
5262 min_precision (maxnode, unsign));
5263 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5265 tree narrowest = c_common_type_for_size (precision, unsign);
5268 warning ("enumeration values exceed range of largest integer");
5269 narrowest = long_long_integer_type_node;
5272 precision = TYPE_PRECISION (narrowest);
5275 precision = TYPE_PRECISION (integer_type_node);
5277 if (precision == TYPE_PRECISION (integer_type_node))
5278 enum_value_type = c_common_type_for_size (precision, 0);
5280 enum_value_type = enumtype;
5282 TYPE_MIN_VALUE (enumtype) = minnode;
5283 TYPE_MAX_VALUE (enumtype) = maxnode;
5284 TYPE_PRECISION (enumtype) = precision;
5285 TREE_UNSIGNED (enumtype) = unsign;
5286 TYPE_SIZE (enumtype) = 0;
5287 layout_type (enumtype);
5289 if (values != error_mark_node)
5291 /* Change the type of the enumerators to be the enum type. We
5292 need to do this irrespective of the size of the enum, for
5293 proper type checking. Replace the DECL_INITIALs of the
5294 enumerators, and the value slots of the list, with copies
5295 that have the enum type; they cannot be modified in place
5296 because they may be shared (e.g. integer_zero_node) Finally,
5297 change the purpose slots to point to the names of the decls. */
5298 for (pair = values; pair; pair = TREE_CHAIN (pair))
5300 tree enu = TREE_PURPOSE (pair);
5302 TREE_TYPE (enu) = enumtype;
5304 /* The ISO C Standard mandates enumerators to have type int,
5305 even though the underlying type of an enum type is
5306 unspecified. Here we convert any enumerators that fit in
5307 an int to type int, to avoid promotions to unsigned types
5308 when comparing integers with enumerators that fit in the
5309 int range. When -pedantic is given, build_enumerator()
5310 would have already taken care of those that don't fit. */
5311 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5312 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5314 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5316 TREE_PURPOSE (pair) = DECL_NAME (enu);
5317 TREE_VALUE (pair) = DECL_INITIAL (enu);
5320 TYPE_VALUES (enumtype) = values;
5323 /* Fix up all variant types of this enum type. */
5324 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5326 if (tem == enumtype)
5328 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5329 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5330 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5331 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5332 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5333 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5334 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5335 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5336 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5337 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5340 /* Finish debugging output for this type. */
5341 rest_of_type_compilation (enumtype, toplevel);
5346 /* Build and install a CONST_DECL for one value of the
5347 current enumeration type (one that was begun with start_enum).
5348 Return a tree-list containing the CONST_DECL and its value.
5349 Assignment of sequential values by default is handled here. */
5352 build_enumerator (tree name, tree value)
5356 /* Validate and default VALUE. */
5358 /* Remove no-op casts from the value. */
5360 STRIP_TYPE_NOPS (value);
5364 if (TREE_CODE (value) == INTEGER_CST)
5366 value = default_conversion (value);
5367 constant_expression_warning (value);
5371 error ("enumerator value for `%s' not integer constant",
5372 IDENTIFIER_POINTER (name));
5377 /* Default based on previous value. */
5378 /* It should no longer be possible to have NON_LVALUE_EXPR
5382 value = enum_next_value;
5384 error ("overflow in enumeration values");
5387 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5389 pedwarn ("ISO C restricts enumerator values to range of `int'");
5390 value = convert (integer_type_node, value);
5393 /* Set basis for default for next value. */
5394 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5395 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5397 /* Now create a declaration for the enum value name. */
5399 type = TREE_TYPE (value);
5400 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5401 TYPE_PRECISION (integer_type_node)),
5402 (TYPE_PRECISION (type)
5403 >= TYPE_PRECISION (integer_type_node)
5404 && TREE_UNSIGNED (type)));
5406 decl = build_decl (CONST_DECL, name, type);
5407 DECL_INITIAL (decl) = convert (type, value);
5410 return tree_cons (decl, value, NULL_TREE);
5414 /* Create the FUNCTION_DECL for a function definition.
5415 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5416 the declaration; they describe the function's name and the type it returns,
5417 but twisted together in a fashion that parallels the syntax of C.
5419 This function creates a binding context for the function body
5420 as well as setting up the FUNCTION_DECL in current_function_decl.
5422 Returns 1 on success. If the DECLARATOR is not suitable for a function
5423 (it defines a datum instead), we return 0, which tells
5424 yyparse to report a parse error. */
5427 start_function (tree declspecs, tree declarator, tree attributes)
5429 tree decl1, old_decl;
5431 int old_immediate_size_expand = immediate_size_expand;
5433 current_function_returns_value = 0; /* Assume, until we see it does. */
5434 current_function_returns_null = 0;
5435 current_function_returns_abnormally = 0;
5436 warn_about_return_type = 0;
5437 current_extern_inline = 0;
5439 /* Don't expand any sizes in the return type of the function. */
5440 immediate_size_expand = 0;
5442 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5444 /* If the declarator is not suitable for a function definition,
5445 cause a syntax error. */
5448 immediate_size_expand = old_immediate_size_expand;
5452 decl_attributes (&decl1, attributes, 0);
5454 if (DECL_DECLARED_INLINE_P (decl1)
5455 && DECL_UNINLINABLE (decl1)
5456 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5457 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5459 announce_function (decl1);
5461 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5463 error ("return type is an incomplete type");
5464 /* Make it return void instead. */
5466 = build_function_type (void_type_node,
5467 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5470 if (warn_about_return_type)
5471 pedwarn_c99 ("return type defaults to `int'");
5473 /* Save the parm names or decls from this function's declarator
5474 where store_parm_decls will find them. */
5475 current_function_parms = last_function_parms;
5476 current_function_parm_tags = last_function_parm_tags;
5477 current_function_parm_others = last_function_parm_others;
5479 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5480 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5481 DECL_INITIAL (decl1) = error_mark_node;
5483 /* If this definition isn't a prototype and we had a prototype declaration
5484 before, copy the arg type info from that prototype.
5485 But not if what we had before was a builtin function. */
5486 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5487 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5488 && !DECL_BUILT_IN (old_decl)
5489 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5490 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5491 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5493 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5494 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5497 /* Optionally warn of old-fashioned def with no previous prototype. */
5498 if (warn_strict_prototypes
5499 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5500 && C_DECL_ISNT_PROTOTYPE (old_decl))
5501 warning ("function declaration isn't a prototype");
5502 /* Optionally warn of any global def with no previous prototype. */
5503 else if (warn_missing_prototypes
5504 && TREE_PUBLIC (decl1)
5505 && ! MAIN_NAME_P (DECL_NAME (decl1))
5506 && C_DECL_ISNT_PROTOTYPE (old_decl))
5507 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5508 /* Optionally warn of any def with no previous prototype
5509 if the function has already been used. */
5510 else if (warn_missing_prototypes
5511 && old_decl != 0 && TREE_USED (old_decl)
5512 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5513 warning ("%J'%D' was used with no prototype before its definition",
5515 /* Optionally warn of any global def with no previous declaration. */
5516 else if (warn_missing_declarations
5517 && TREE_PUBLIC (decl1)
5519 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5520 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5521 /* Optionally warn of any def with no previous declaration
5522 if the function has already been used. */
5523 else if (warn_missing_declarations
5524 && old_decl != 0 && TREE_USED (old_decl)
5525 && C_DECL_IMPLICIT (old_decl))
5526 warning ("%J`%D' was used with no declaration before its definition",
5529 /* This is a definition, not a reference.
5530 So normally clear DECL_EXTERNAL.
5531 However, `extern inline' acts like a declaration
5532 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5533 DECL_EXTERNAL (decl1) = current_extern_inline;
5535 /* This function exists in static storage.
5536 (This does not mean `static' in the C sense!) */
5537 TREE_STATIC (decl1) = 1;
5539 /* A nested function is not global. */
5540 if (current_function_decl != 0)
5541 TREE_PUBLIC (decl1) = 0;
5543 #ifdef ENABLE_CHECKING
5544 /* This is the earliest point at which we might know the assembler
5545 name of the function. Thus, if it's set before this, die horribly. */
5546 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5550 /* If #pragma weak was used, mark the decl weak now. */
5551 if (current_scope == global_scope)
5552 maybe_apply_pragma_weak (decl1);
5554 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5555 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5560 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5561 != integer_type_node)
5562 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5564 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5565 args = TREE_CHAIN (args))
5567 tree type = args ? TREE_VALUE (args) : 0;
5569 if (type == void_type_node)
5576 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5577 pedwarn ("%Jfirst argument of '%D' should be `int'",
5582 if (TREE_CODE (type) != POINTER_TYPE
5583 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5584 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5586 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5591 if (TREE_CODE (type) != POINTER_TYPE
5592 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5593 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5595 pedwarn ("%Jthird argument of '%D' should probably be "
5596 "'char **'", decl1, decl1);
5601 /* It is intentional that this message does not mention the third
5602 argument because it's only mentioned in an appendix of the
5604 if (argct > 0 && (argct < 2 || argct > 3))
5605 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5607 if (! TREE_PUBLIC (decl1))
5608 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5611 /* Record the decl so that the function name is defined.
5612 If we already have a decl for this name, and it is a FUNCTION_DECL,
5613 use the old decl. */
5615 current_function_decl = pushdecl (decl1);
5618 declare_parm_level ();
5620 make_decl_rtl (current_function_decl, NULL);
5622 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5623 /* Promote the value to int before returning it. */
5624 if (c_promoting_integer_type_p (restype))
5626 /* It retains unsignedness if not really getting wider. */
5627 if (TREE_UNSIGNED (restype)
5628 && (TYPE_PRECISION (restype)
5629 == TYPE_PRECISION (integer_type_node)))
5630 restype = unsigned_type_node;
5632 restype = integer_type_node;
5634 DECL_RESULT (current_function_decl)
5635 = build_decl (RESULT_DECL, NULL_TREE, restype);
5637 /* If this fcn was already referenced via a block-scope `extern' decl
5638 (or an implicit decl), propagate certain information about the usage. */
5639 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5640 TREE_ADDRESSABLE (current_function_decl) = 1;
5642 immediate_size_expand = old_immediate_size_expand;
5644 start_fname_decls ();
5649 /* Subroutine of store_parm_decls which handles new-style function
5650 definitions (prototype format). The parms already have decls, so we
5651 need only record them as in effect and complain if any redundant
5652 old-style parm decls were written. */
5654 store_parm_decls_newstyle (void)
5657 tree fndecl = current_function_decl;
5658 tree parms = current_function_parms;
5659 tree tags = current_function_parm_tags;
5660 tree others = current_function_parm_others;
5662 if (current_scope->parms || current_scope->names || current_scope->tags)
5664 error ("%Jold-style parameter declarations in prototyped "
5665 "function definition", fndecl);
5667 /* Get rid of the old-style declarations. */
5672 /* Now make all the parameter declarations visible in the function body.
5673 We can bypass most of the grunt work of pushdecl. */
5674 for (last = 0, decl = parms; decl; last = decl, decl = TREE_CHAIN (decl))
5676 DECL_CONTEXT (decl) = current_function_decl;
5677 if (DECL_NAME (decl) == 0)
5678 error ("%Jparameter name omitted", decl);
5681 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5682 current_scope->shadowed
5683 = tree_cons (DECL_NAME (decl),
5684 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5685 current_scope->shadowed);
5686 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5689 current_scope->parms = parms;
5690 current_scope->parms_last = last;
5692 /* Record the parameter list in the function declaration. */
5693 DECL_ARGUMENTS (fndecl) = parms;
5695 /* Now make all the ancillary declarations visible, likewise. */
5696 for (last = 0, decl = others; decl; last = decl, decl = TREE_CHAIN (decl))
5698 DECL_CONTEXT (decl) = current_function_decl;
5699 if (DECL_NAME (decl)
5700 && TYPE_MAIN_VARIANT (TREE_TYPE (decl)) != void_type_node)
5702 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5703 current_scope->shadowed
5704 = tree_cons (DECL_NAME (decl),
5705 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5706 current_scope->shadowed);
5707 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5710 current_scope->names = others;
5711 current_scope->names_last = last;
5713 /* And all the tag declarations. */
5714 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5715 if (TREE_PURPOSE (decl))
5717 if (IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)))
5718 current_scope->shadowed_tags
5719 = tree_cons (TREE_PURPOSE (decl),
5720 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (decl)),
5721 current_scope->shadowed_tags);
5722 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)) = TREE_VALUE (decl);
5724 current_scope->tags = tags;
5727 /* Subroutine of store_parm_decls which handles old-style function
5728 definitions (separate parameter list and declarations). */
5731 store_parm_decls_oldstyle (void)
5733 tree parm, decl, last;
5734 tree fndecl = current_function_decl;
5736 /* This is the identifier list from the function declarator. */
5737 tree parmids = current_function_parms;
5739 /* We use DECL_WEAK as a flag to show which parameters have been
5740 seen already, since it is not used on PARM_DECL. */
5741 #ifdef ENABLE_CHECKING
5742 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5743 if (DECL_WEAK (parm))
5747 /* Match each formal parameter name with its declaration. Save each
5748 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5749 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5751 if (TREE_VALUE (parm) == 0)
5753 error ("%Jparameter name missing from parameter list", fndecl);
5754 TREE_PURPOSE (parm) = 0;
5758 decl = IDENTIFIER_SYMBOL_VALUE (TREE_VALUE (parm));
5759 if (decl && DECL_CONTEXT (decl) == fndecl)
5761 /* If we got something other than a PARM_DECL it is an error. */
5762 if (TREE_CODE (decl) != PARM_DECL)
5763 error ("%J\"%D\" declared as a non-parameter", decl, decl);
5764 /* If the declaration is already marked, we have a duplicate
5765 name. Complain and ignore the duplicate. */
5766 else if (DECL_WEAK (decl))
5768 error ("%Jmultiple parameters named \"%D\"", decl, decl);
5769 TREE_PURPOSE (parm) = 0;
5772 /* If the declaration says "void", complain and turn it into
5774 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5776 error ("%Jparameter \"%D\" declared void", decl, decl);
5777 TREE_TYPE (decl) = integer_type_node;
5778 DECL_ARG_TYPE (decl) = integer_type_node;
5779 layout_decl (decl, 0);
5782 /* If no declaration found, default to int. */
5785 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5786 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5787 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5791 pedwarn ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5792 else if (extra_warnings)
5793 warning ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5796 TREE_PURPOSE (parm) = decl;
5797 DECL_WEAK (decl) = 1;
5800 /* Now examine the parms chain for incomplete declarations
5801 and declarations with no corresponding names. */
5803 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5805 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5807 error ("%Jparameter \"%D\" has incomplete type", parm, parm);
5808 TREE_TYPE (parm) = error_mark_node;
5811 if (! DECL_WEAK (parm))
5813 error ("%Jdeclaration for parameter \"%D\" but no such parameter",
5816 /* Pretend the parameter was not missing.
5817 This gets us to a standard state and minimizes
5818 further error messages. */
5819 parmids = chainon (parmids, tree_cons (parm, 0, 0));
5823 /* Chain the declarations together in the order of the list of
5824 names. Store that chain in the function decl, replacing the
5825 list of names. Update the current scope to match. */
5826 DECL_ARGUMENTS (fndecl) = 0;
5828 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5829 if (TREE_PURPOSE (parm))
5831 if (parm && TREE_PURPOSE (parm))
5833 last = TREE_PURPOSE (parm);
5834 DECL_ARGUMENTS (fndecl) = last;
5835 current_scope->parms = last;
5836 DECL_WEAK (last) = 0;
5838 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
5839 if (TREE_PURPOSE (parm))
5841 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5842 last = TREE_PURPOSE (parm);
5843 DECL_WEAK (last) = 0;
5845 current_scope->parms_last = last;
5846 TREE_CHAIN (last) = 0;
5849 /* If there was a previous prototype,
5850 set the DECL_ARG_TYPE of each argument according to
5851 the type previously specified, and report any mismatches. */
5853 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5856 for (parm = DECL_ARGUMENTS (fndecl),
5857 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5858 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5859 != void_type_node));
5860 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5862 if (parm == 0 || type == 0
5863 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5865 error ("number of arguments doesn't match prototype");
5866 error ("%Hprototype declaration",
5867 ¤t_function_prototype_locus);
5870 /* Type for passing arg must be consistent with that
5871 declared for the arg. ISO C says we take the unqualified
5872 type for parameters declared with qualified type. */
5873 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5874 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
5877 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5878 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5880 /* Adjust argument to match prototype. E.g. a previous
5881 `int foo(float);' prototype causes
5882 `int foo(x) float x; {...}' to be treated like
5883 `int foo(float x) {...}'. This is particularly
5884 useful for argument types like uid_t. */
5885 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5887 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
5888 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5889 && TYPE_PRECISION (TREE_TYPE (parm))
5890 < TYPE_PRECISION (integer_type_node))
5891 DECL_ARG_TYPE (parm) = integer_type_node;
5895 pedwarn ("promoted argument \"%D\" "
5896 "doesn't match prototype", parm);
5897 pedwarn ("%Hprototype declaration",
5898 ¤t_function_prototype_locus);
5903 error ("argument \"%D\" doesn't match prototype", parm);
5904 error ("%Hprototype declaration",
5905 ¤t_function_prototype_locus);
5909 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5912 /* Otherwise, create a prototype that would match. */
5916 tree actual = 0, last = 0, type;
5918 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5920 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
5922 TREE_CHAIN (last) = type;
5927 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5929 TREE_CHAIN (last) = type;
5933 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5934 of the type of this function, but we need to avoid having this
5935 affect the types of other similarly-typed functions, so we must
5936 first force the generation of an identical (but separate) type
5937 node for the relevant function type. The new node we create
5938 will be a variant of the main variant of the original function
5941 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5943 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5947 /* Store the parameter declarations into the current function declaration.
5948 This is called after parsing the parameter declarations, before
5949 digesting the body of the function.
5951 For an old-style definition, construct a prototype out of the old-style
5952 parameter declarations and inject it into the function's type. */
5955 store_parm_decls (void)
5957 tree fndecl = current_function_decl;
5959 /* The function containing FNDECL, if any. */
5960 tree context = decl_function_context (fndecl);
5962 /* True if this definition is written with a prototype. */
5963 bool prototype = (current_function_parms
5964 && TREE_CODE (current_function_parms) != TREE_LIST);
5967 store_parm_decls_newstyle ();
5969 store_parm_decls_oldstyle ();
5971 /* The next call to pushlevel will be a function body. */
5973 next_is_function_body = true;
5975 /* Write a record describing this function definition to the prototypes
5976 file (if requested). */
5978 gen_aux_info_record (fndecl, 1, 0, prototype);
5980 /* Initialize the RTL code for the function. */
5981 allocate_struct_function (fndecl);
5983 /* Begin the statement tree for this function. */
5984 begin_stmt_tree (&DECL_SAVED_TREE (fndecl));
5986 /* If this is a nested function, save away the sizes of any
5987 variable-size types so that we can expand them when generating
5993 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
5994 = nreverse (get_pending_sizes ());
5995 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
5998 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6001 /* This function is being processed in whole-function mode. */
6002 cfun->x_whole_function_mode_p = 1;
6004 /* Even though we're inside a function body, we still don't want to
6005 call expand_expr to calculate the size of a variable-sized array.
6006 We haven't necessarily assigned RTL to all variables yet, so it's
6007 not safe to try to expand expressions involving them. */
6008 immediate_size_expand = 0;
6009 cfun->x_dont_save_pending_sizes_p = 1;
6012 /* Finish up a function declaration and compile that function
6013 all the way to assembler language output. The free the storage
6014 for the function definition.
6016 This is called after parsing the body of the function definition. */
6019 finish_function (void)
6021 tree fndecl = current_function_decl;
6023 /* When a function declaration is totally empty, e.g.
6025 (the argument list is irrelevant) the compstmt rule will not
6026 bother calling pushlevel/poplevel, which means we get here with
6027 the scope stack out of sync. Detect this situation by noticing
6028 that current_scope is still as store_parm_decls left it, and do
6029 a dummy push/pop to get back to consistency.
6030 Note that the call to pushlevel does not actually push another
6031 scope - see there for details. */
6033 if (current_scope->parm_flag && next_is_function_body)
6039 if (TREE_CODE (fndecl) == FUNCTION_DECL
6040 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6042 tree args = DECL_ARGUMENTS (fndecl);
6043 for (; args; args = TREE_CHAIN (args))
6045 tree type = TREE_TYPE (args);
6046 if (INTEGRAL_TYPE_P (type)
6047 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6048 DECL_ARG_TYPE (args) = integer_type_node;
6052 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6054 /* Must mark the RESULT_DECL as being in this function. */
6056 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6058 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6060 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6061 != integer_type_node)
6063 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6064 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6066 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6070 #ifdef DEFAULT_MAIN_RETURN
6071 /* Make it so that `main' always returns success by default. */
6072 DEFAULT_MAIN_RETURN;
6075 c_expand_return (integer_zero_node);
6080 finish_fname_decls ();
6082 /* Tie off the statement tree for this function. */
6083 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6085 /* Complain if there's just no return statement. */
6086 if (warn_return_type
6087 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6088 && !current_function_returns_value && !current_function_returns_null
6089 /* Don't complain if we abort. */
6090 && !current_function_returns_abnormally
6091 /* Don't warn for main(). */
6092 && !MAIN_NAME_P (DECL_NAME (fndecl))
6093 /* Or if they didn't actually specify a return type. */
6094 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6095 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6096 inline function, as we might never be compiled separately. */
6097 && DECL_INLINE (fndecl))
6098 warning ("no return statement in function returning non-void");
6100 /* With just -Wextra, complain only if function returns both with
6101 and without a value. */
6103 && current_function_returns_value
6104 && current_function_returns_null)
6105 warning ("this function may return with or without a value");
6107 /* We're leaving the context of this function, so zap cfun. It's still in
6108 DECL_SAVED_INSNS, and we'll restore it in tree_rest_of_compilation. */
6111 /* ??? Objc emits functions after finalizing the compilation unit.
6112 This should be cleaned up later and this conditional removed. */
6113 if (!cgraph_global_info_ready)
6114 cgraph_finalize_function (fndecl, false);
6116 c_expand_body (fndecl);
6117 current_function_decl = NULL;
6120 /* Generate the RTL for a deferred function FNDECL. */
6123 c_expand_deferred_function (tree fndecl)
6125 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6126 function was deferred, e.g. in duplicate_decls. */
6127 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6129 if (flag_inline_trees)
6131 timevar_push (TV_INTEGRATION);
6132 optimize_inline_calls (fndecl);
6133 timevar_pop (TV_INTEGRATION);
6135 c_expand_body (fndecl);
6136 current_function_decl = NULL;
6140 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6141 then we are already in the process of generating RTL for another
6145 c_expand_body_1 (tree fndecl, int nested_p)
6149 /* Make sure that we will evaluate variable-sized types involved
6150 in our function's type. */
6151 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6153 /* Squirrel away our current state. */
6154 push_function_context ();
6157 tree_rest_of_compilation (fndecl, nested_p);
6160 /* Return to the enclosing function. */
6161 pop_function_context ();
6163 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6165 if (targetm.have_ctors_dtors)
6166 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6167 DEFAULT_INIT_PRIORITY);
6169 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6172 if (DECL_STATIC_DESTRUCTOR (fndecl))
6174 if (targetm.have_ctors_dtors)
6175 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6176 DEFAULT_INIT_PRIORITY);
6178 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6182 /* Like c_expand_body_1 but only for unnested functions. */
6185 c_expand_body (tree fndecl)
6187 c_expand_body_1 (fndecl, 0);
6190 /* Check the declarations given in a for-loop for satisfying the C99
6193 check_for_loop_decls (void)
6199 /* If we get here, declarations have been used in a for loop without
6200 the C99 for loop scope. This doesn't make much sense, so don't
6202 error ("'for' loop initial declaration used outside C99 mode");
6205 /* C99 subclause 6.8.5 paragraph 3:
6207 [#3] The declaration part of a for statement shall only
6208 declare identifiers for objects having storage class auto or
6211 It isn't clear whether, in this sentence, "identifiers" binds to
6212 "shall only declare" or to "objects" - that is, whether all identifiers
6213 declared must be identifiers for objects, or whether the restriction
6214 only applies to those that are. (A question on this in comp.std.c
6215 in November 2000 received no answer.) We implement the strictest
6216 interpretation, to avoid creating an extension which later causes
6219 for (t = current_scope->tags; t; t = TREE_CHAIN (t))
6221 if (TREE_PURPOSE (t) != 0)
6223 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6225 if (code == RECORD_TYPE)
6226 error ("'struct %s' declared in 'for' loop initial declaration",
6227 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6228 else if (code == UNION_TYPE)
6229 error ("'union %s' declared in 'for' loop initial declaration",
6230 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6232 error ("'enum %s' declared in 'for' loop initial declaration",
6233 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6237 for (t = getdecls (); t; t = TREE_CHAIN (t))
6239 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6240 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6241 "initial declaration", t, t);
6242 else if (TREE_STATIC (t))
6243 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6244 "initial declaration", t, t);
6245 else if (DECL_EXTERNAL (t))
6246 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6247 "initial declaration", t, t);
6251 /* Save and restore the variables in this file and elsewhere
6252 that keep track of the progress of compilation of the current function.
6253 Used for nested functions. */
6255 struct language_function GTY(())
6257 struct c_language_function base;
6260 int returns_abnormally;
6261 int warn_about_return_type;
6265 /* Save and reinitialize the variables
6266 used during compilation of a C function. */
6269 c_push_function_context (struct function *f)
6271 struct language_function *p;
6272 p = ggc_alloc (sizeof (struct language_function));
6275 p->base.x_stmt_tree = c_stmt_tree;
6276 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6277 p->returns_value = current_function_returns_value;
6278 p->returns_null = current_function_returns_null;
6279 p->returns_abnormally = current_function_returns_abnormally;
6280 p->warn_about_return_type = warn_about_return_type;
6281 p->extern_inline = current_extern_inline;
6284 /* Restore the variables used during compilation of a C function. */
6287 c_pop_function_context (struct function *f)
6289 struct language_function *p = f->language;
6291 if (DECL_SAVED_INSNS (current_function_decl) == 0
6292 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6294 /* Stop pointing to the local nodes about to be freed. */
6295 /* But DECL_INITIAL must remain nonzero so we know this
6296 was an actual function definition. */
6297 DECL_INITIAL (current_function_decl) = error_mark_node;
6298 DECL_ARGUMENTS (current_function_decl) = 0;
6301 c_stmt_tree = p->base.x_stmt_tree;
6302 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6303 current_function_returns_value = p->returns_value;
6304 current_function_returns_null = p->returns_null;
6305 current_function_returns_abnormally = p->returns_abnormally;
6306 warn_about_return_type = p->warn_about_return_type;
6307 current_extern_inline = p->extern_inline;
6312 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6315 c_dup_lang_specific_decl (tree decl)
6317 struct lang_decl *ld;
6319 if (!DECL_LANG_SPECIFIC (decl))
6322 ld = ggc_alloc (sizeof (struct lang_decl));
6323 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6324 DECL_LANG_SPECIFIC (decl) = ld;
6327 /* The functions below are required for functionality of doing
6328 function at once processing in the C front end. Currently these
6329 functions are not called from anywhere in the C front end, but as
6330 these changes continue, that will change. */
6332 /* Returns nonzero if the current statement is a full expression,
6333 i.e. temporaries created during that statement should be destroyed
6334 at the end of the statement. */
6337 stmts_are_full_exprs_p (void)
6342 /* Returns the stmt_tree (if any) to which statements are currently
6343 being added. If there is no active statement-tree, NULL is
6347 current_stmt_tree (void)
6349 return &c_stmt_tree;
6352 /* Returns the stack of SCOPE_STMTs for the current function. */
6355 current_scope_stmt_stack (void)
6357 return &c_scope_stmt_stack;
6360 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6364 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6369 /* Dummy function in place of callback used by C++. */
6372 extract_interface_info (void)
6376 /* Return a new COMPOUND_STMT, after adding it to the current
6380 c_begin_compound_stmt (void)
6384 /* Create the COMPOUND_STMT. */
6385 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6390 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6394 c_expand_decl_stmt (tree t)
6396 tree decl = DECL_STMT_DECL (t);
6398 /* Expand nested functions. */
6399 if (TREE_CODE (decl) == FUNCTION_DECL
6400 && DECL_CONTEXT (decl) == current_function_decl
6401 && DECL_SAVED_TREE (decl))
6402 c_expand_body_1 (decl, 1);
6405 /* Return the global value of T as a symbol. */
6408 identifier_global_value (tree t)
6410 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6411 if (decl == 0 || DECL_FILE_SCOPE_P (decl))
6414 /* Shadowed by something else; find the true global value. */
6415 for (decl = global_scope->names; decl; decl = TREE_CHAIN (decl))
6416 if (DECL_NAME (decl) == t)
6419 /* Only local values for this decl. */
6423 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6424 otherwise the name is found in ridpointers from RID_INDEX. */
6427 record_builtin_type (enum rid rid_index, const char *name, tree type)
6431 id = ridpointers[(int) rid_index];
6433 id = get_identifier (name);
6434 pushdecl (build_decl (TYPE_DECL, id, type));
6437 /* Build the void_list_node (void_type_node having been created). */
6439 build_void_list_node (void)
6441 tree t = build_tree_list (NULL_TREE, void_type_node);
6445 /* Return something to represent absolute declarators containing a *.
6446 TARGET is the absolute declarator that the * contains.
6447 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6448 to apply to the pointer type, represented as identifiers, possible mixed
6451 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6452 if attributes are present) and whose type is the modifier list. */
6455 make_pointer_declarator (tree type_quals_attrs, tree target)
6458 tree itarget = target;
6459 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6460 if (attrs != NULL_TREE)
6461 itarget = tree_cons (attrs, target, NULL_TREE);
6462 return build1 (INDIRECT_REF, quals, itarget);
6465 /* A wrapper around lhd_set_decl_assembler_name that gives static
6466 variables their C names if they are at file scope and only one
6467 translation unit is being compiled, for backwards compatibility
6468 with certain bizarre assembler hacks (like crtstuff.c). */
6471 c_static_assembler_name (tree decl)
6473 if (num_in_fnames == 1
6474 && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6475 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6476 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6478 lhd_set_decl_assembler_name (decl);
6481 /* Hash and equality functions for link_hash_table: key off
6482 DECL_ASSEMBLER_NAME. */
6485 link_hash_hash (const void *x_p)
6488 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6492 link_hash_eq (const void *x1_p, const void *x2_p)
6494 tree x1 = (tree)x1_p;
6495 tree x2 = (tree)x2_p;
6496 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6499 /* Propagate information between definitions and uses between multiple
6500 translation units in TU_LIST based on linkage rules. */
6503 merge_translation_unit_decls (void)
6505 const tree tu_list = current_file_decl;
6508 htab_t link_hash_table;
6511 /* Create the BLOCK that poplevel would have created, but don't
6512 actually call poplevel since that's expensive. */
6513 block = make_node (BLOCK);
6514 BLOCK_VARS (block) = current_scope->names;
6515 TREE_USED (block) = 1;
6516 DECL_INITIAL (current_file_decl) = block;
6518 /* If only one translation unit seen, no copying necessary. */
6519 if (TREE_CHAIN (tu_list) == NULL_TREE)
6522 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6524 /* Enter any actual definitions into the hash table. */
6525 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6526 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6527 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6530 slot = htab_find_slot (link_hash_table, decl, INSERT);
6532 /* If we've already got a definition, work out which one is
6533 the real one, put it into the hash table, and make the
6534 other one DECL_EXTERNAL. This is important to avoid
6535 putting out two definitions of the same symbol in the
6539 tree old_decl = (tree) *slot;
6541 /* If this is weak or common or whatever, suppress it
6542 in favor of the other definition. */
6543 if (DECL_WEAK (decl))
6544 DECL_EXTERNAL (decl) = 1;
6545 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6546 DECL_EXTERNAL (old_decl) = 1;
6547 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6548 DECL_EXTERNAL (decl) = 1;
6549 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6550 DECL_EXTERNAL (old_decl) = 1;
6552 if (DECL_EXTERNAL (decl))
6554 DECL_INITIAL (decl) = NULL_TREE;
6555 DECL_COMMON (decl) = 0;
6556 DECL_ONE_ONLY (decl) = 0;
6557 DECL_WEAK (decl) = 0;
6559 else if (DECL_EXTERNAL (old_decl))
6561 DECL_INITIAL (old_decl) = NULL_TREE;
6562 DECL_COMMON (old_decl) = 0;
6563 DECL_ONE_ONLY (old_decl) = 0;
6564 DECL_WEAK (old_decl) = 0;
6569 error ("%Jredefinition of global '%D'", decl, decl);
6570 error ("%J'%D' previously defined here", old_decl, old_decl);
6577 /* Now insert the desired information from all the definitions
6578 into any plain declarations. */
6579 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6580 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6581 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6584 global_decl = htab_find (link_hash_table, decl);
6589 /* Print any appropriate error messages, and partially merge
6591 (void) duplicate_decls (decl, global_decl, true, true);
6594 htab_delete (link_hash_table);
6597 /* Perform final processing on file-scope data. */
6600 c_write_global_declarations(void)
6604 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6606 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6607 int len = list_length (globals);
6608 tree *vec = xmalloc (sizeof (tree) * len);
6612 /* Process the decls in the order they were written. */
6614 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6617 wrapup_global_declarations (vec, len);
6619 check_global_declarations (vec, len);
6626 /* Reset the parser's state in preparation for a new file. */
6629 c_reset_state (void)
6632 tree file_scope_decl;
6634 /* Pop the global scope. */
6635 if (current_scope != global_scope)
6636 current_scope = global_scope;
6637 file_scope_decl = current_file_decl;
6638 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6639 BLOCK_SUPERCONTEXT (DECL_INITIAL (file_scope_decl)) = file_scope_decl;
6640 truly_local_externals = NULL_TREE;
6642 /* Start a new global binding level. */
6644 global_scope = current_scope;
6645 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6646 TREE_CHAIN (current_file_decl) = file_scope_decl;
6648 /* Reintroduce the builtin declarations. */
6649 for (link = first_builtin_decl;
6650 link != TREE_CHAIN (last_builtin_decl);
6651 link = TREE_CHAIN (link))
6652 pushdecl (copy_node (link));
6655 #include "gt-c-decl.h"