1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
35 #include "tree-inline.h"
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 TYPENAME}; /* Typename (inside cast or sizeof) */
67 /* Nonzero if we have seen an invalid cross reference
68 to a struct, union, or enum, but not yet printed the message. */
70 tree pending_invalid_xref;
71 /* File and line to appear in the eventual error message. */
72 location_t pending_invalid_xref_location;
74 /* While defining an enum type, this is 1 plus the last enumerator
75 constant value. Note that will do not have to save this or `enum_overflow'
76 around nested function definition since such a definition could only
77 occur in an enum value expression and we don't use these variables in
80 static tree enum_next_value;
82 /* Nonzero means that there was overflow computing enum_next_value. */
84 static int enum_overflow;
86 /* Parsing a function declarator leaves a list of parameter names
87 or a chain of parameter decls here. */
89 static tree last_function_parms;
91 /* ... and a chain of structure and enum types declared in the
94 static tree last_function_parm_tags;
96 /* ... and a chain of all non-parameter declarations (such as
97 CONST_DECLs from enumerations) here. */
99 static tree last_function_parm_others;
101 /* After parsing the declarator that starts a function definition,
102 `start_function' puts the list of parameter names or chain of decls here
103 for `store_parm_decls' to find. */
105 static tree current_function_parms;
107 /* Similar, for last_function_parm_tags. */
109 static tree current_function_parm_tags;
111 /* And for last_function_parm_others. */
113 static tree current_function_parm_others;
115 /* Similar, for the file and line that the prototype came from if this is
116 an old-style definition. */
118 static location_t current_function_prototype_locus;
120 /* The current statement tree. */
122 static GTY(()) struct stmt_tree_s c_stmt_tree;
124 /* The current scope statement stack. */
126 static GTY(()) tree c_scope_stmt_stack;
128 /* State saving variables. */
129 int c_in_iteration_stmt;
132 /* A list of external DECLs that appeared at block scope when there was
133 some other global meaning for that identifier. */
134 static GTY(()) tree truly_local_externals;
136 /* All the builtins; this is a subset of the entries of global_scope. */
138 static GTY(()) tree first_builtin_decl;
139 static GTY(()) tree last_builtin_decl;
141 /* A DECL for the current file-scope context. */
143 static GTY(()) tree current_file_decl;
145 /* Set to 0 at beginning of a function definition, set to 1 if
146 a return statement that specifies a return value is seen. */
148 int current_function_returns_value;
150 /* Set to 0 at beginning of a function definition, set to 1 if
151 a return statement with no argument is seen. */
153 int current_function_returns_null;
155 /* Set to 0 at beginning of a function definition, set to 1 if
156 a call to a noreturn function is seen. */
158 int current_function_returns_abnormally;
160 /* Set to nonzero by `grokdeclarator' for a function
161 whose return type is defaulted, if warnings for this are desired. */
163 static int warn_about_return_type;
165 /* Nonzero when starting a function declared `extern inline'. */
167 static int current_extern_inline;
169 /* Each c_scope structure describes the complete contents of one scope.
170 Three scopes are distinguished specially: the innermost or current
171 scope, the innermost function scope, and the outermost or file scope.
173 Most declarations are recorded in the current scope.
175 All normal label declarations are recorded in the innermost
176 function scope, as are bindings of undeclared identifiers to
177 error_mark_node. (GCC permits nested functions as an extension,
178 hence the 'innermost' qualifier.) Explicitly declared labels
179 (using the __label__ extension) appear in the current scope.
181 Being in the global scope (current_scope == global_scope) causes
182 special behavior in several places below. Also, under some
183 conditions the Objective-C front end records declarations in the
184 global scope even though that isn't the current scope.
186 The order of the names, parms, and blocks lists matters, and they
187 are frequently appended to. To avoid having to walk all the way to
188 the end of the list on each insertion, or reverse the lists later,
189 we maintain a pointer to the last list entry for each of the lists.
191 The order of the tags, shadowed, and shadowed_tags
192 lists does not matter, so we just prepend to these lists. */
194 struct c_scope GTY(())
196 /* The scope containing this one. */
197 struct c_scope *outer;
199 /* The next outermost function scope. */
200 struct c_scope *outer_function;
202 /* All variables, constants, functions, labels, and typedef names. */
206 /* All parameter declarations. Used only in the outermost scope of
211 /* All structure, union, and enum type tags. */
214 /* For each scope, a list of shadowed outer-scope definitions
215 to be restored when this scope is popped.
216 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
217 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
220 /* For each scope, a list of shadowed outer-scope tag definitions
221 to be restored when this scope is popped.
222 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
223 whose TREE_VALUE is its old definition (a kind of ..._TYPE node). */
226 /* For each scope (except the global one), a chain of BLOCK nodes
227 for all the scopes that were entered and exited one level down. */
231 /* True if we are currently filling this scope with parameter
233 BOOL_BITFIELD parm_flag : 1;
235 /* True if we already complained about forward parameter decls
236 in this scope. This prevents double warnings on
237 foo (int a; int b; ...) */
238 BOOL_BITFIELD warned_forward_parm_decls : 1;
240 /* True if this is the outermost block scope of a function body.
241 This scope contains the parameters, the local variables declared
242 in the outermost block, and all the labels (except those in
243 nested functions, or declared at block scope with __label__). */
244 BOOL_BITFIELD function_body : 1;
246 /* True means make a BLOCK for this scope no matter what. */
247 BOOL_BITFIELD keep : 1;
250 /* The scope currently in effect. */
252 static GTY(()) struct c_scope *current_scope;
254 /* A chain of c_scope structures awaiting reuse. */
256 static GTY((deletable (""))) struct c_scope *scope_freelist;
258 /* The innermost function scope. Ordinary (not explicitly declared)
259 labels, bindings to error_mark_node, and the lazily-created
260 bindings of __func__ and its friends get this scope. */
262 static GTY(()) struct c_scope *current_function_scope;
264 /* The outermost scope, corresponding to the C "file scope". This is
265 created when the compiler is started and exists through the entire run. */
267 static GTY(()) struct c_scope *global_scope;
269 /* Append VAR to LIST in scope SCOPE. */
270 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
271 struct c_scope *s_ = (scope); \
273 if (s_->list##_last) \
274 TREE_CHAIN (s_->list##_last) = d_; \
277 s_->list##_last = d_; \
280 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
281 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
282 struct c_scope *t_ = (tscope); \
283 struct c_scope *f_ = (fscope); \
285 TREE_CHAIN (t_->to##_last) = f_->from; \
288 t_->to##_last = f_->from##_last; \
291 /* True means unconditionally make a BLOCK for the next scope pushed. */
293 static bool keep_next_level_flag;
295 /* True means the next call to pushlevel will be the outermost scope
296 of a function body, so do not push a new scope, merely cease
297 expecting parameter decls. */
299 static bool next_is_function_body;
301 /* Functions called automatically at the beginning and end of execution. */
303 tree static_ctors, static_dtors;
305 /* Forward declarations. */
307 static struct c_scope *make_scope (void);
308 static void pop_scope (void);
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, tree *);
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 check_bitfield_type_and_width (tree *, tree *, const char *);
325 static void clone_underlying_type (tree);
326 static bool flexible_array_type_p (tree);
327 static hashval_t link_hash_hash (const void *);
328 static int link_hash_eq (const void *, const void *);
330 /* States indicating how grokdeclarator() should handle declspecs marked
331 with __attribute__((deprecated)). An object declared as
332 __attribute__((deprecated)) suppresses warnings of uses of other
335 enum deprecated_states {
340 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
343 c_print_identifier (FILE *file, tree node, int indent)
345 print_node (file, "symbol", IDENTIFIER_SYMBOL_VALUE (node), indent + 4);
346 print_node (file, "tag", IDENTIFIER_TAG_VALUE (node), indent + 4);
347 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
348 if (C_IS_RESERVED_WORD (node))
350 tree rid = ridpointers[C_RID_CODE (node)];
351 indent_to (file, indent + 4);
352 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
353 (void *) rid, IDENTIFIER_POINTER (rid));
357 /* Hook called at end of compilation to assume 1 elt
358 for a file-scope tentative array defn that wasn't complete before. */
361 c_finish_incomplete_decl (tree decl)
363 if (TREE_CODE (decl) == VAR_DECL)
365 tree type = TREE_TYPE (decl);
366 if (type != error_mark_node
367 && TREE_CODE (type) == ARRAY_TYPE
368 && ! DECL_EXTERNAL (decl)
369 && TYPE_DOMAIN (type) == 0)
371 warning ("%Jarray '%D' assumed to have one element", decl, decl);
373 complete_array_type (type, NULL_TREE, 1);
375 layout_decl (decl, 0);
380 /* Reuse or create a struct for this scope. */
382 static struct c_scope *
385 struct c_scope *result;
388 result = scope_freelist;
389 scope_freelist = result->outer;
392 result = ggc_alloc_cleared (sizeof (struct c_scope));
397 /* Remove the topmost scope from the stack and add it to the
398 free list, updating current_function_scope if necessary. */
403 struct c_scope *scope = current_scope;
405 current_scope = scope->outer;
406 if (scope->function_body)
407 current_function_scope = scope->outer_function;
409 memset (scope, 0, sizeof (struct c_scope));
410 scope->outer = scope_freelist;
411 scope_freelist = scope;
414 /* The Objective-C front-end often needs to determine the current scope. */
417 get_current_scope (void)
419 return current_scope;
422 /* The following function is used only by Objective-C. It needs to live here
423 because it accesses the innards of c_scope. */
426 objc_mark_locals_volatile (void *enclosing_blk)
428 struct c_scope *scope;
430 for (scope = current_scope;
431 scope && scope != enclosing_blk;
432 scope = scope->outer)
436 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
438 DECL_REGISTER (decl) = 0;
439 TREE_THIS_VOLATILE (decl) = 1;
441 /* Do not climb up past the current function. */
442 if (scope->function_body)
447 /* Nonzero if we are currently in the global scope. */
450 global_bindings_p (void)
452 return current_scope == global_scope;
456 keep_next_level (void)
458 keep_next_level_flag = true;
461 /* Identify this scope as currently being filled with parameters. */
464 declare_parm_level (void)
466 current_scope->parm_flag = true;
469 /* Nonzero if currently making parm declarations. */
472 in_parm_level_p (void)
474 return current_scope->parm_flag;
477 /* Enter a new scope. The dummy parameter is for signature
478 compatibility with lang_hooks.decls.pushlevel. */
481 pushlevel (int dummy ATTRIBUTE_UNUSED)
483 if (next_is_function_body)
485 /* This is the transition from the parameters to the top level
486 of the function body. These are the same scope
487 (C99 6.2.1p4,6) so we do not push another scope structure.
488 next_is_function_body is set only by store_parm_decls, which
489 in turn is called when and only when we are about to
490 encounter the opening curly brace for the function body.
492 The outermost block of a function always gets a BLOCK node,
493 because the debugging output routines expect that each
494 function has at least one BLOCK. */
495 current_scope->parm_flag = false;
496 current_scope->function_body = true;
497 current_scope->keep = true;
498 current_scope->outer_function = current_function_scope;
499 current_function_scope = current_scope;
501 keep_next_level_flag = false;
502 next_is_function_body = false;
506 struct c_scope *scope = make_scope ();
508 scope->keep = keep_next_level_flag;
509 scope->outer = current_scope;
510 current_scope = scope;
511 keep_next_level_flag = false;
515 /* Exit a scope. Restore the state of the identifier-decl mappings
516 that were in effect when this scope was entered.
518 If KEEP is KEEP_YES (1), this scope had explicit declarations, so
519 create a BLOCK node to record its declarations and subblocks for
520 debugging output. If KEEP is KEEP_MAYBE, do so only if the names
521 or tags lists are nonempty.
523 The second parameter is ignored; it is present only for
524 signature compatibility with lang_hooks.decls.poplevel.
526 If FUNCTIONBODY is nonzero, this level is the body of a function,
527 even if current_scope->function_body is not set. This is used
528 by language-independent code that generates synthetic functions,
529 and cannot set current_scope->function_body.
531 FIXME: Eliminate the need for all arguments. */
534 poplevel (int keep, int dummy ATTRIBUTE_UNUSED, int functionbody)
536 struct c_scope *scope = current_scope;
541 /* The following line does not use |= due to a bug in HP's C compiler. */
542 scope->function_body = scope->function_body | functionbody;
544 if (keep == KEEP_MAYBE)
545 keep = (scope->names || scope->tags);
548 keep |= scope->function_body;
550 /* If appropriate, create a BLOCK to record the decls for the life
555 block = make_node (BLOCK);
556 BLOCK_VARS (block) = scope->names;
557 BLOCK_SUBBLOCKS (block) = scope->blocks;
558 TREE_USED (block) = 1;
561 /* In each subblock, record that this is its superior. */
562 for (p = scope->blocks; p; p = TREE_CHAIN (p))
563 BLOCK_SUPERCONTEXT (p) = block;
565 /* Clear out the variable bindings in this scope.
567 Propagate TREE_ADDRESSABLE from nested functions to their
568 containing functions.
570 Issue warnings for unused variables and labels, and errors for
571 undefined labels, if there are any. */
573 for (p = scope->names; p; p = TREE_CHAIN (p))
575 switch (TREE_CODE (p))
578 if (TREE_USED (p) && !DECL_INITIAL (p))
580 error ("%Jlabel `%D' used but not defined", p, p);
581 DECL_INITIAL (p) = error_mark_node;
583 else if (!TREE_USED (p) && warn_unused_label)
585 if (DECL_INITIAL (p))
586 warning ("%Jlabel `%D' defined but not used", p, p);
588 warning ("%Jlabel `%D' declared but not defined", p, p);
591 IDENTIFIER_LABEL_VALUE (DECL_NAME (p)) = 0;
595 if (! TREE_ASM_WRITTEN (p)
596 && DECL_INITIAL (p) != 0
597 && TREE_ADDRESSABLE (p)
598 && DECL_ABSTRACT_ORIGIN (p) != 0
599 && DECL_ABSTRACT_ORIGIN (p) != p)
600 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
604 /* Keep this in sync with stmt.c:warn_about_unused_variables.
605 No warnings when the global scope is popped because the
606 global scope isn't popped for the last translation unit,
607 so the warnings are done in c_write_global_declaration. */
608 if (warn_unused_variable && scope != global_scope
610 && !DECL_IN_SYSTEM_HEADER (p)
612 && !DECL_ARTIFICIAL (p))
613 warning ("%Junused variable `%D'", p, p);
620 if (DECL_EXTERNAL (p) && scope != global_scope)
621 /* External decls stay in the symbol-value slot but are
623 C_DECL_INVISIBLE (p) = 1;
625 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p)) = 0;
631 /* Clear out the parameter bindings in this scope, if any.
632 Unused-parameter warnings are handled by function.c. */
633 for (p = scope->parms; p; p = TREE_CHAIN (p))
635 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p)) = 0;
637 /* Clear out the tag-meanings declared in this scope.
639 Set the TYPE_CONTEXTs for all of the tagged types belonging to
640 this scope so that they point to the appropriate construct, i.e.
641 either to the current FUNCTION_DECL node, or else to the BLOCK
642 node we just constructed.
644 Note that for tagged types whose scope is just the formal
645 parameter list for some function type specification, we can't
646 properly set their TYPE_CONTEXTs here, because we don't have a
647 pointer to the appropriate FUNCTION_TYPE node readily available
648 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
649 type nodes get set in `grokdeclarator' as soon as we have created
650 the FUNCTION_TYPE node which will represent the "scope" for these
651 "parameter list local" tagged types. */
653 decl = scope->function_body ? current_function_decl : block;
654 for (p = scope->tags; p; p = TREE_CHAIN (p))
656 if (TREE_PURPOSE (p))
657 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p)) = 0;
659 TYPE_CONTEXT (TREE_VALUE (p)) = decl;
662 /* Restore all name- and label-meanings from outer scopes that were
663 shadowed by this scope. */
664 for (p = scope->shadowed; p; p = TREE_CHAIN (p))
665 if (TREE_VALUE (p) && TREE_CODE (TREE_VALUE (p)) == LABEL_DECL)
666 IDENTIFIER_LABEL_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
668 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
670 /* Restore all tag-meanings from outer scopes that were shadowed by
672 for (p = scope->shadowed_tags; p; p = TREE_CHAIN (p))
673 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
675 /* Dispose of the block that we just made inside some higher level. */
676 if (scope->function_body && current_function_decl)
677 DECL_INITIAL (current_function_decl) = block;
678 else if (scope->outer)
681 SCOPE_LIST_APPEND (scope->outer, blocks, block);
682 /* If we did not make a block for the scope just exited, any
683 blocks made for inner scopes must be carried forward so they
684 will later become subblocks of something else. */
685 else if (scope->blocks)
686 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
689 /* Pop the current scope, and free the structure for reuse. */
695 /* Insert BLOCK at the end of the list of subblocks of the current
696 scope. This is used when a BIND_EXPR is expanded, to handle the
697 BLOCK node inside the BIND_EXPR. */
700 insert_block (tree block)
702 TREE_USED (block) = 1;
703 SCOPE_LIST_APPEND (current_scope, blocks, block);
706 /* Set the BLOCK node for the innermost scope (the one we are
707 currently in). The RTL expansion machinery requires us to provide
708 this hook, but it is not useful in function-at-a-time mode. */
711 set_block (tree block ATTRIBUTE_UNUSED)
715 /* Push a definition or a declaration of struct, union or enum tag "name".
716 "type" should be the type node.
717 We assume that the tag "name" is not already defined.
719 Note that the definition may really be just a forward reference.
720 In that case, the TYPE_SIZE will be zero. */
723 pushtag (tree name, tree type)
725 struct c_scope *b = current_scope;
727 /* Record the identifier as the type's name if it has none. */
730 if (TYPE_NAME (type) == 0)
731 TYPE_NAME (type) = name;
733 if (IDENTIFIER_TAG_VALUE (name))
734 b->shadowed_tags = tree_cons (name, IDENTIFIER_TAG_VALUE (name),
736 IDENTIFIER_TAG_VALUE (name) = type;
739 b->tags = tree_cons (name, type, b->tags);
741 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
742 tagged type we just added to the current scope. This fake
743 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
744 to output a representation of a tagged type, and it also gives
745 us a convenient place to record the "scope start" address for the
748 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
750 /* An approximation for now, so we can tell this is a function-scope tag.
751 This will be updated in poplevel. */
752 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
755 /* Subroutine of compare_decls. Allow harmless mismatches in return
756 and argument types provided that the type modes match. This function
757 return a unified type given a suitable match, and 0 otherwise. */
760 match_builtin_function_types (tree newtype, tree oldtype)
762 tree newrettype, oldrettype;
763 tree newargs, oldargs;
764 tree trytype, tryargs;
766 /* Accept the return type of the new declaration if same modes. */
767 oldrettype = TREE_TYPE (oldtype);
768 newrettype = TREE_TYPE (newtype);
770 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
773 oldargs = TYPE_ARG_TYPES (oldtype);
774 newargs = TYPE_ARG_TYPES (newtype);
777 while (oldargs || newargs)
781 || ! TREE_VALUE (oldargs)
782 || ! TREE_VALUE (newargs)
783 || TYPE_MODE (TREE_VALUE (oldargs))
784 != TYPE_MODE (TREE_VALUE (newargs)))
787 oldargs = TREE_CHAIN (oldargs);
788 newargs = TREE_CHAIN (newargs);
791 trytype = build_function_type (newrettype, tryargs);
792 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
795 /* Subroutine of diagnose_mismathed_decls. Check for function type
796 mismatch involving an empty arglist vs a nonempty one and give clearer
799 diagnose_arglist_conflict (tree newdecl, tree olddecl,
800 tree newtype, tree oldtype)
804 if (TREE_CODE (olddecl) != FUNCTION_DECL
805 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype), COMPARE_STRICT)
806 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
808 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
811 t = TYPE_ARG_TYPES (oldtype);
813 t = TYPE_ARG_TYPES (newtype);
814 for (; t; t = TREE_CHAIN (t))
816 tree type = TREE_VALUE (t);
818 if (TREE_CHAIN (t) == 0
819 && TYPE_MAIN_VARIANT (type) != void_type_node)
821 inform ("a parameter list with an ellipsis can't match "
822 "an empty parameter name list declaration");
826 if (c_type_promotes_to (type) != type)
828 inform ("an argument type that has a default promotion can't match "
829 "an empty parameter name list declaration");
835 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
836 old-style function definition, NEWDECL is a prototype declaration.
837 Diagnose inconsistencies in the argument list. Returns TRUE if
838 the prototype is compatible, FALSE if not. */
840 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
842 tree newargs, oldargs;
845 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
846 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
848 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
849 newargs = TYPE_ARG_TYPES (newtype);
854 tree oldargtype = TREE_VALUE (oldargs);
855 tree newargtype = TREE_VALUE (newargs);
857 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
860 /* Reaching the end of just one list means the two decls don't
861 agree on the number of arguments. */
862 if (END_OF_ARGLIST (oldargtype))
864 error ("%Jprototype for '%D' declares more arguments "
865 "than previous old-style definition", newdecl, newdecl);
868 else if (END_OF_ARGLIST (newargtype))
870 error ("%Jprototype for '%D' declares fewer arguments "
871 "than previous old-style definition", newdecl, newdecl);
875 /* Type for passing arg must be consistent with that declared
877 else if (! comptypes (oldargtype, newargtype, COMPARE_STRICT))
879 error ("%Jprototype for '%D' declares arg %d with incompatible type",
880 newdecl, newdecl, i);
884 oldargs = TREE_CHAIN (oldargs);
885 newargs = TREE_CHAIN (newargs);
889 /* If we get here, no errors were found, but do issue a warning
890 for this poor-style construct. */
891 warning ("%Jprototype for '%D' follows non-prototype definition",
894 #undef END_OF_ARGLIST
897 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
898 first in a pair of mismatched declarations, using the diagnostic
901 locate_old_decl (tree decl, void (*diag)(const char *, ...))
903 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
905 else if (DECL_INITIAL (decl))
906 diag (N_("%Jprevious definition of '%D' was here"), decl, decl);
907 else if (C_DECL_IMPLICIT (decl))
908 diag (N_("%Jprevious implicit declaration of '%D' was here"), decl, decl);
910 diag (N_("%Jprevious declaration of '%D' was here"), decl, decl);
913 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
914 Returns true if the caller should proceed to merge the two, false
915 if OLDDECL should simply be discarded. As a side effect, issues
916 all necessary diagnostics for invalid or poor-style combinations.
917 If it returns true, writes the types of NEWDECL and OLDDECL to
918 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
919 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
922 diagnose_mismatched_decls (tree newdecl, tree olddecl,
923 tree *newtypep, tree *oldtypep)
925 tree newtype, oldtype;
926 bool pedwarned = false;
929 /* If we have error_mark_node for either decl or type, just discard
930 the previous decl - we're in an error cascade already. */
931 if (olddecl == error_mark_node || newdecl == error_mark_node)
933 *oldtypep = oldtype = TREE_TYPE (olddecl);
934 *newtypep = newtype = TREE_TYPE (newdecl);
935 if (oldtype == error_mark_node || newtype == error_mark_node)
938 /* Two different categories of symbol altogether. This is an error
939 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
940 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
942 if (TREE_CODE (olddecl) != FUNCTION_DECL
943 || !DECL_BUILT_IN (olddecl) || !C_DECL_INVISIBLE (olddecl))
945 error ("%J'%D' redeclared as different kind of symbol",
947 locate_old_decl (olddecl, error);
949 else if (TREE_PUBLIC (newdecl))
950 warning ("%Jbuilt-in function '%D' declared as non-function",
952 else if (warn_shadow)
953 warning ("%Jshadowing built-in function '%D'",
958 /* Enumerators have no linkage, so may only be declared once in a
960 if (TREE_CODE (olddecl) == CONST_DECL)
962 error ("%Jredeclaration of enumerator `%D'", newdecl, newdecl);
963 locate_old_decl (olddecl, error);
967 if (!comptypes (oldtype, newtype, COMPARE_STRICT))
969 if (TREE_CODE (olddecl) == FUNCTION_DECL
970 && DECL_BUILT_IN (olddecl) && C_DECL_INVISIBLE (olddecl))
972 /* Accept harmless mismatch in function types.
973 This is for the ffs and fprintf builtins. */
974 tree trytype = match_builtin_function_types (newtype, oldtype);
976 if (trytype && comptypes (newtype, trytype, COMPARE_STRICT))
977 *oldtypep = oldtype = trytype;
980 /* If types don't match for a built-in, throw away the
981 built-in. No point in calling locate_old_decl here, it
982 won't print anything. */
983 warning ("%Jconflicting types for built-in function '%D'",
988 else if (TREE_CODE (olddecl) == FUNCTION_DECL
989 && DECL_SOURCE_LINE (olddecl) == 0)
991 /* A conflicting function declaration for a predeclared
992 function that isn't actually built in. Objective C uses
993 these. The new declaration silently overrides everything
994 but the volatility (i.e. noreturn) indication. See also
995 below. FIXME: Make Objective C use normal builtins. */
996 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
999 /* Permit void foo (...) to match int foo (...) if the latter is
1000 the definition and implicit int was used. See
1001 c-torture/compile/920625-2.c. */
1002 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1003 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1004 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1005 && C_FUNCTION_IMPLICIT_INT (newdecl))
1007 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
1008 /* Make sure we keep void as the return type. */
1009 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1010 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1015 error ("%Jconflicting types for '%D'", newdecl, newdecl);
1016 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1017 locate_old_decl (olddecl, error);
1022 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1023 but silently ignore the redeclaration if either is in a system
1024 header. (Conflicting redeclarations were handled above.) */
1025 if (TREE_CODE (newdecl) == TYPE_DECL)
1027 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1028 return true; /* allow OLDDECL to continue in use */
1030 error ("%Jredefinition of typedef '%D'", newdecl, newdecl);
1031 locate_old_decl (olddecl, error);
1035 /* Function declarations can either be 'static' or 'extern' (no
1036 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1037 can never conflict with each other on account of linkage (6.2.2p4).
1038 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1039 two definitions if one is 'extern inline' and one is not. The non-
1040 extern-inline definition supersedes the extern-inline definition. */
1041 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1043 /* If you declare a built-in function name as static, or
1044 define the built-in with an old-style definition (so we
1045 can't validate the argument list) the built-in definition is
1046 overridden, but optionally warn this was a bad choice of name. */
1047 if (DECL_BUILT_IN (olddecl)
1048 && C_DECL_INVISIBLE (olddecl)
1049 && (!TREE_PUBLIC (newdecl)
1050 || (DECL_INITIAL (newdecl)
1051 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1054 warning ("%Jshadowing built-in function '%D'", newdecl, newdecl);
1055 /* Discard the old built-in function. */
1059 if (DECL_INITIAL (newdecl))
1061 if (DECL_INITIAL (olddecl)
1062 && !(DECL_DECLARED_INLINE_P (olddecl)
1063 && DECL_EXTERNAL (olddecl)
1064 && !(DECL_DECLARED_INLINE_P (newdecl)
1065 && DECL_EXTERNAL (newdecl))))
1067 error ("%Jredefinition of '%D'", newdecl, newdecl);
1068 locate_old_decl (olddecl, error);
1072 /* If we have a prototype after an old-style function definition,
1073 the argument types must be checked specially. */
1074 else if (DECL_INITIAL (olddecl)
1075 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1076 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1077 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1079 locate_old_decl (olddecl, error);
1082 /* Mismatched non-static and static is considered poor style.
1083 We only diagnose static then non-static if -Wtraditional,
1084 because it is the most convenient way to get some effects
1085 (see e.g. what unwind-dw2-fde-glibc.c does to the definition
1086 of _Unwind_Find_FDE in unwind-dw2-fde.c). Revisit? */
1087 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1089 /* A static function declaration for a predeclared function
1090 that isn't actually built in, silently overrides the
1091 default. Objective C uses these. See also above.
1092 FIXME: Make Objective C use normal builtins. */
1093 if (TREE_CODE (olddecl) == FUNCTION_DECL
1094 && DECL_SOURCE_LINE (olddecl) == 0)
1098 warning ("%Jstatic declaration of '%D' follows "
1099 "non-static declaration", newdecl, newdecl);
1103 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl)
1104 && warn_traditional)
1106 warning ("%Jnon-static declaration of '%D' follows "
1107 "static declaration", newdecl, newdecl);
1111 else if (TREE_CODE (newdecl) == VAR_DECL)
1113 /* Only variables can be thread-local, and all declarations must
1114 agree on this property. */
1115 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1117 if (DECL_THREAD_LOCAL (newdecl))
1118 error ("%Jthread-local declaration of '%D' follows "
1119 "non-thread-local declaration", newdecl, newdecl);
1121 error ("%Jnon-thread-local declaration of '%D' follows "
1122 "thread-local declaration", newdecl, newdecl);
1124 locate_old_decl (olddecl, error);
1128 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1129 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1131 error ("%Jredefinition of '%D'", newdecl, newdecl);
1132 locate_old_decl (olddecl, error);
1136 /* Objects declared at file scope: if at least one is 'extern',
1137 it's fine (6.2.2p4); otherwise the linkage must agree (6.2.2p7). */
1138 if (DECL_FILE_SCOPE_P (newdecl))
1140 if (!DECL_EXTERNAL (newdecl)
1141 && !DECL_EXTERNAL (olddecl)
1142 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1144 if (TREE_PUBLIC (newdecl))
1145 error ("%Jnon-static declaration of '%D' follows "
1146 "static declaration", newdecl, newdecl);
1148 error ("%Jstatic declaration of '%D' follows "
1149 "non-static declaration", newdecl, newdecl);
1151 locate_old_decl (olddecl, error);
1155 /* Two objects with the same name declared at the same block
1156 scope must both be external references (6.7p3). */
1157 else if (DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl)
1158 && (!DECL_EXTERNAL (newdecl) || !DECL_EXTERNAL (olddecl)))
1160 if (DECL_EXTERNAL (newdecl))
1161 error ("%Jextern declaration of '%D' follows "
1162 "declaration with no linkage", newdecl, newdecl);
1163 else if (DECL_EXTERNAL (olddecl))
1164 error ("%Jdeclaration of '%D' with no linkage follows "
1165 "extern declaration", newdecl, newdecl);
1167 error ("%Jredeclaration of '%D' with no linkage",
1170 locate_old_decl (olddecl, error);
1176 /* All decls must agree on a non-default visibility. */
1177 if (DECL_VISIBILITY (newdecl) != VISIBILITY_DEFAULT
1178 && DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT
1179 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1181 warning ("%Jredeclaration of '%D' with different visibility "
1182 "(old visibility preserved)", newdecl, newdecl);
1186 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1188 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1189 if (DECL_DECLARED_INLINE_P (newdecl)
1190 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1192 warning ("%Jinline declaration of '%D' follows "
1193 "declaration with attribute noinline", newdecl, newdecl);
1196 else if (DECL_DECLARED_INLINE_P (olddecl)
1197 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1199 warning ("%Jdeclaration of '%D' with attribute noinline follows "
1200 "inline declaration ", newdecl, newdecl);
1204 /* Inline declaration after use or definition.
1205 ??? Should we still warn about this now we have unit-at-a-time
1206 mode and can get it right? */
1207 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl))
1209 if (TREE_USED (olddecl))
1211 warning ("%J'%D' declared inline after being called",
1215 else if (DECL_INITIAL (olddecl))
1217 warning ("%J'%D' declared inline after its definition",
1223 else /* PARM_DECL, VAR_DECL */
1225 /* Redeclaration of a PARM_DECL is invalid unless this is the
1226 real position of a forward-declared parameter (GCC extension). */
1227 if (TREE_CODE (newdecl) == PARM_DECL
1228 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1230 error ("%Jredefinition of parameter '%D'", newdecl, newdecl);
1231 locate_old_decl (olddecl, error);
1235 /* These bits are only type qualifiers when applied to objects. */
1236 if (TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl))
1238 if (TREE_THIS_VOLATILE (newdecl))
1239 pedwarn ("%Jvolatile declaration of '%D' follows "
1240 "non-volatile declaration", newdecl, newdecl);
1242 pedwarn ("%Jnon-volatile declaration of '%D' follows "
1243 "volatile declaration", newdecl, newdecl);
1246 if (TREE_READONLY (newdecl) != TREE_READONLY (olddecl))
1248 if (TREE_READONLY (newdecl))
1249 pedwarn ("%Jconst declaration of '%D' follows "
1250 "non-const declaration", newdecl, newdecl);
1252 pedwarn ("%Jnon-const declaration of '%D' follows "
1253 "const declaration", newdecl, newdecl);
1258 /* Optional warning for completely redundant decls. */
1259 if (!warned && !pedwarned
1260 && warn_redundant_decls
1261 /* Don't warn about a function declaration followed by a
1263 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1264 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1265 /* Don't warn about redundant redeclarations of builtins. */
1266 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1267 && !DECL_BUILT_IN (newdecl)
1268 && DECL_BUILT_IN (olddecl)
1269 && C_DECL_INVISIBLE (olddecl))
1270 /* Don't warn about an extern followed by a definition. */
1271 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1272 /* Don't warn about forward parameter decls. */
1273 && !(TREE_CODE (newdecl) == PARM_DECL
1274 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1275 /* Don't warn about a variable definition following a declaration. */
1276 && !(TREE_CODE (newdecl) == VAR_DECL
1277 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
1279 warning ("%Jredundant redeclaration of '%D'", newdecl, newdecl);
1283 /* Report location of previous decl/defn in a consistent manner. */
1284 if (warned || pedwarned)
1285 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1290 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1291 consistent with OLDDECL, but carries new information. Merge the
1292 new information into OLDDECL. This function issues no
1296 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1298 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1299 && DECL_INITIAL (newdecl) != 0);
1301 /* For real parm decl following a forward decl, return 1 so old decl
1302 will be reused. Only allow this to happen once. */
1303 if (TREE_CODE (newdecl) == PARM_DECL
1304 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1306 TREE_ASM_WRITTEN (olddecl) = 0;
1310 DECL_ATTRIBUTES (newdecl)
1311 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1313 /* Merge the data types specified in the two decls. */
1315 = TREE_TYPE (olddecl)
1316 = common_type (newtype, oldtype);
1318 /* Lay the type out, unless already done. */
1319 if (oldtype != TREE_TYPE (newdecl))
1321 if (TREE_TYPE (newdecl) != error_mark_node)
1322 layout_type (TREE_TYPE (newdecl));
1323 if (TREE_CODE (newdecl) != FUNCTION_DECL
1324 && TREE_CODE (newdecl) != TYPE_DECL
1325 && TREE_CODE (newdecl) != CONST_DECL)
1326 layout_decl (newdecl, 0);
1330 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1331 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1332 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1333 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1334 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1335 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1337 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1338 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1342 /* Keep the old rtl since we can safely use it. */
1343 COPY_DECL_RTL (olddecl, newdecl);
1345 /* Merge the type qualifiers. */
1346 if (TREE_READONLY (newdecl))
1347 TREE_READONLY (olddecl) = 1;
1349 if (TREE_THIS_VOLATILE (newdecl))
1351 TREE_THIS_VOLATILE (olddecl) = 1;
1352 if (TREE_CODE (newdecl) == VAR_DECL)
1353 make_var_volatile (newdecl);
1356 /* Keep source location of definition rather than declaration. */
1357 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1358 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1360 /* Merge the unused-warning information. */
1361 if (DECL_IN_SYSTEM_HEADER (olddecl))
1362 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1363 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1364 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1366 /* Merge the initialization information. */
1367 if (DECL_INITIAL (newdecl) == 0)
1368 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1370 /* Merge the section attribute.
1371 We want to issue an error if the sections conflict but that must be
1372 done later in decl_attributes since we are called before attributes
1374 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1375 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1377 /* Copy the assembler name.
1378 Currently, it can only be defined in the prototype. */
1379 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1381 /* If either declaration has a nondefault visibility, use it. */
1382 if (DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT)
1383 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1385 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1387 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1388 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1389 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1390 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1391 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1392 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1393 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1394 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1395 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1398 /* Merge the storage class information. */
1399 merge_weak (newdecl, olddecl);
1401 /* For functions, static overrides non-static. */
1402 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1404 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1405 /* This is since we don't automatically
1406 copy the attributes of NEWDECL into OLDDECL. */
1407 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1408 /* If this clears `static', clear it in the identifier too. */
1409 if (! TREE_PUBLIC (olddecl))
1410 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1412 if (DECL_EXTERNAL (newdecl))
1414 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1415 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1417 /* An extern decl does not override previous storage class. */
1418 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1419 if (! DECL_EXTERNAL (newdecl))
1421 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1422 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1427 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1428 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1431 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1433 /* If we're redefining a function previously defined as extern
1434 inline, make sure we emit debug info for the inline before we
1435 throw it away, in case it was inlined into a function that hasn't
1436 been written out yet. */
1437 if (new_is_definition && DECL_INITIAL (olddecl))
1439 if (TREE_USED (olddecl)
1440 /* In unit-at-a-time mode we never inline re-defined extern
1441 inline functions. */
1442 && !flag_unit_at_a_time
1443 && cgraph_function_possibly_inlined_p (olddecl))
1444 (*debug_hooks->outlining_inline_function) (olddecl);
1446 /* The new defn must not be inline. */
1447 DECL_INLINE (newdecl) = 0;
1448 DECL_UNINLINABLE (newdecl) = 1;
1452 /* If either decl says `inline', this fn is inline,
1453 unless its definition was passed already. */
1454 if (DECL_DECLARED_INLINE_P (newdecl)
1455 || DECL_DECLARED_INLINE_P (olddecl))
1456 DECL_DECLARED_INLINE_P (newdecl) = 1;
1458 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1459 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1462 if (DECL_BUILT_IN (olddecl))
1464 /* If redeclaring a builtin function, it stays built in. */
1465 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1466 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1469 /* Also preserve various other info from the definition. */
1470 if (! new_is_definition)
1472 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1473 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1474 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1475 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1476 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1478 /* Set DECL_INLINE on the declaration if we've got a body
1479 from which to instantiate. */
1480 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1482 DECL_INLINE (newdecl) = 1;
1483 DECL_ABSTRACT_ORIGIN (newdecl)
1484 = DECL_ABSTRACT_ORIGIN (olddecl);
1489 /* If a previous declaration said inline, mark the
1490 definition as inlinable. */
1491 if (DECL_DECLARED_INLINE_P (newdecl)
1492 && ! DECL_UNINLINABLE (newdecl))
1493 DECL_INLINE (newdecl) = 1;
1497 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1498 But preserve OLDDECL's DECL_UID and C_DECL_INVISIBLE. */
1500 unsigned olddecl_uid = DECL_UID (olddecl);
1501 unsigned olddecl_invisible = C_DECL_INVISIBLE (olddecl);
1503 memcpy ((char *) olddecl + sizeof (struct tree_common),
1504 (char *) newdecl + sizeof (struct tree_common),
1505 sizeof (struct tree_decl) - sizeof (struct tree_common));
1506 DECL_UID (olddecl) = olddecl_uid;
1507 C_DECL_INVISIBLE (olddecl) = olddecl_invisible;
1510 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1511 so that encode_section_info has a chance to look at the new decl
1512 flags and attributes. */
1513 if (DECL_RTL_SET_P (olddecl)
1514 && (TREE_CODE (olddecl) == FUNCTION_DECL
1515 || (TREE_CODE (olddecl) == VAR_DECL
1516 && TREE_STATIC (olddecl))))
1517 make_decl_rtl (olddecl, NULL);
1520 /* Handle when a new declaration NEWDECL has the same name as an old
1521 one OLDDECL in the same binding contour. Prints an error message
1524 If safely possible, alter OLDDECL to look like NEWDECL, and return
1525 true. Otherwise, return false. */
1528 duplicate_decls (tree newdecl, tree olddecl)
1530 tree newtype, oldtype;
1532 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1535 merge_decls (newdecl, olddecl, newtype, oldtype);
1540 /* Return any external DECL associated with ID, whether or not it is
1541 currently in scope. */
1544 any_external_decl (tree id)
1546 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1549 if (decl == 0 || TREE_CODE (decl) == ERROR_MARK)
1551 else if (TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1554 t = purpose_member (id, truly_local_externals);
1556 return TREE_VALUE (t);
1561 /* Record an external decl DECL. This only does something if a
1562 shadowing decl already exists. */
1564 record_external_decl (tree decl)
1566 tree name = DECL_NAME (decl);
1567 if (!IDENTIFIER_SYMBOL_VALUE (name))
1570 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1573 /* Check whether decl-node X shadows an existing declaration.
1574 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1575 which might be a NULL_TREE. */
1577 warn_if_shadowing (tree x, tree old)
1579 /* Nothing to shadow? */
1581 /* Shadow warnings not wanted? */
1583 /* No shadow warnings for internally generated vars. */
1584 || DECL_SOURCE_LINE (x) == 0
1585 /* No shadow warnings for vars made for inlining. */
1586 || DECL_FROM_INLINE (x)
1587 /* Don't warn about the parm names in function declarator
1588 within a function declarator.
1589 It would be nice to avoid warning in any function
1590 declarator in a declaration, as opposed to a definition,
1591 but there is no way to tell it's not a definition. */
1592 || (TREE_CODE (x) == PARM_DECL && current_scope->outer->parm_flag)
1593 /* Shadow warnings only apply to local variables and parameters. */
1594 || (TREE_CODE (x) != PARM_DECL && DECL_FILE_SCOPE_P (x)))
1597 if (TREE_CODE (old) == PARM_DECL)
1598 warning ("%Jdeclaration of '%D' shadows a parameter", x, x);
1599 else if (DECL_FILE_SCOPE_P (old))
1600 warning ("%Jdeclaration of '%D' shadows a global declaration", x, x);
1602 warning ("%Jdeclaration of '%D' shadows a previous local", x, x);
1604 warning ("%Jshadowed declaration is here", old);
1608 /* Subroutine of pushdecl.
1610 X is a TYPE_DECL for a typedef statement. Create a brand new
1611 ..._TYPE node (which will be just a variant of the existing
1612 ..._TYPE node with identical properties) and then install X
1613 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1615 The whole point here is to end up with a situation where each
1616 and every ..._TYPE node the compiler creates will be uniquely
1617 associated with AT MOST one node representing a typedef name.
1618 This way, even though the compiler substitutes corresponding
1619 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1620 early on, later parts of the compiler can always do the reverse
1621 translation and get back the corresponding typedef name. For
1624 typedef struct S MY_TYPE;
1627 Later parts of the compiler might only know that `object' was of
1628 type `struct S' if it were not for code just below. With this
1629 code however, later parts of the compiler see something like:
1631 struct S' == struct S
1632 typedef struct S' MY_TYPE;
1635 And they can then deduce (from the node for type struct S') that
1636 the original object declaration was:
1640 Being able to do this is important for proper support of protoize,
1641 and also for generating precise symbolic debugging information
1642 which takes full account of the programmer's (typedef) vocabulary.
1644 Obviously, we don't want to generate a duplicate ..._TYPE node if
1645 the TYPE_DECL node that we are now processing really represents a
1646 standard built-in type.
1648 Since all standard types are effectively declared at line zero
1649 in the source file, we can easily check to see if we are working
1650 on a standard type by checking the current value of lineno. */
1653 clone_underlying_type (tree x)
1655 if (DECL_SOURCE_LINE (x) == 0)
1657 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1658 TYPE_NAME (TREE_TYPE (x)) = x;
1660 else if (TREE_TYPE (x) != error_mark_node
1661 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1663 tree tt = TREE_TYPE (x);
1664 DECL_ORIGINAL_TYPE (x) = tt;
1665 tt = build_type_copy (tt);
1667 TREE_USED (tt) = TREE_USED (x);
1672 /* Record a decl-node X as belonging to the current lexical scope.
1673 Check for errors (such as an incompatible declaration for the same
1674 name already seen in the same scope).
1676 Returns either X or an old decl for the same name.
1677 If an old decl is returned, it may have been smashed
1678 to agree with what X says. */
1683 tree name = DECL_NAME (x);
1684 struct c_scope *scope = current_scope;
1686 #ifdef ENABLE_CHECKING
1687 if (error_mark_node == 0)
1688 /* Called too early. */
1692 /* Functions need the lang_decl data. */
1693 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1694 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1696 /* A local extern declaration for a function doesn't constitute nesting.
1697 A local auto declaration does, since it's a forward decl
1698 for a nested function coming later. */
1699 if (current_function_decl == NULL
1700 || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1701 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
1702 DECL_CONTEXT (x) = current_file_decl;
1704 DECL_CONTEXT (x) = current_function_decl;
1710 if (warn_nested_externs
1711 && scope != global_scope
1712 && DECL_EXTERNAL (x)
1713 && !DECL_IN_SYSTEM_HEADER (x))
1714 warning ("nested extern declaration of `%s'",
1715 IDENTIFIER_POINTER (name));
1717 old = lookup_name_current_level (name);
1718 if (old && duplicate_decls (x, old))
1720 /* For PARM_DECLs, old may be a forward declaration.
1721 If so, we want to remove it from its old location
1722 (in the variables chain) and rechain it in the
1723 location given by the new declaration. */
1724 if (TREE_CODE (x) == PARM_DECL)
1727 for (p = &scope->names; *p; p = &TREE_CHAIN (*p))
1730 *p = TREE_CHAIN (old);
1731 SCOPE_LIST_APPEND (scope, parms, old);
1737 if (DECL_EXTERNAL (x) || scope == global_scope)
1739 /* Find and check against a previous, not-in-scope, external
1740 decl for this identifier. (C99 6.2.7p2: All declarations
1741 that refer to the same object or function shall have
1742 compatible type; otherwise, the behavior is undefined.) */
1743 tree ext = any_external_decl (name);
1746 if (duplicate_decls (x, ext))
1747 x = copy_node (ext);
1750 record_external_decl (x);
1753 if (TREE_CODE (x) == TYPE_DECL)
1754 clone_underlying_type (x);
1756 /* If storing a local value, there may already be one
1757 (inherited). If so, record it for restoration when this
1758 scope ends. Take care not to do this if we are replacing an
1759 older decl in the same scope (i.e. duplicate_decls returned
1761 if (scope != global_scope)
1763 tree inherited_decl = lookup_name (name);
1764 if (inherited_decl && inherited_decl != old)
1766 warn_if_shadowing (x, inherited_decl);
1767 scope->shadowed = tree_cons (name, inherited_decl,
1772 /* Install the new declaration in the requested scope. */
1773 IDENTIFIER_SYMBOL_VALUE (name) = x;
1774 C_DECL_INVISIBLE (x) = 0;
1776 /* If x's type is incomplete because it's based on a
1777 structure or union which has not yet been fully declared,
1778 attach it to that structure or union type, so we can go
1779 back and complete the variable declaration later, if the
1780 structure or union gets fully declared.
1782 If the input is erroneous, we can have error_mark in the type
1783 slot (e.g. "f(void a, ...)") - that doesn't count as an
1785 if (TREE_TYPE (x) != error_mark_node
1786 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1788 tree element = TREE_TYPE (x);
1790 while (TREE_CODE (element) == ARRAY_TYPE)
1791 element = TREE_TYPE (element);
1792 element = TYPE_MAIN_VARIANT (element);
1794 if ((TREE_CODE (element) == RECORD_TYPE
1795 || TREE_CODE (element) == UNION_TYPE)
1796 && (TREE_CODE (x) != TYPE_DECL
1797 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
1798 && !COMPLETE_TYPE_P (element))
1799 C_TYPE_INCOMPLETE_VARS (element)
1800 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
1804 if (TREE_CODE (x) == PARM_DECL)
1805 SCOPE_LIST_APPEND (scope, parms, x);
1807 SCOPE_LIST_APPEND (scope, names, x);
1812 /* Record X as belonging to the global scope (C99 "file scope").
1813 This is used only internally by the Objective-C front end,
1814 and is limited to its needs. duplicate_decls is not called;
1815 if there is any preexisting decl for this identifier, it is an ICE. */
1818 pushdecl_top_level (tree x)
1822 if (TREE_CODE (x) != VAR_DECL)
1825 name = DECL_NAME (x);
1827 if (IDENTIFIER_SYMBOL_VALUE (name))
1830 DECL_CONTEXT (x) = current_file_decl;
1831 IDENTIFIER_SYMBOL_VALUE (name) = x;
1833 SCOPE_LIST_APPEND (global_scope, names, x);
1837 /* Generate an implicit declaration for identifier FUNCTIONID as a
1838 function of type int (). */
1841 implicitly_declare (tree functionid)
1843 tree decl = any_external_decl (functionid);
1847 /* Implicit declaration of a function already declared
1848 (somehow) in a different scope, or as a built-in.
1849 If this is the first time this has happened, warn;
1850 then recycle the old declaration. */
1851 if (!C_DECL_IMPLICIT (decl))
1853 implicit_decl_warning (DECL_NAME (decl));
1854 if (! DECL_FILE_SCOPE_P (decl))
1855 warning ("%Jprevious declaration of '%D'", decl, decl);
1856 C_DECL_IMPLICIT (decl) = 1;
1858 /* If this function is global, then it must already be in the
1859 global scope, so there's no need to push it again. */
1860 if (current_scope == global_scope)
1862 /* If this is a local declaration, make a copy; we can't have
1863 the same DECL listed in two different scopes. */
1864 return pushdecl (copy_node (decl));
1867 /* Not seen before. */
1868 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1869 DECL_EXTERNAL (decl) = 1;
1870 TREE_PUBLIC (decl) = 1;
1871 C_DECL_IMPLICIT (decl) = 1;
1872 implicit_decl_warning (functionid);
1874 /* C89 says implicit declarations are in the innermost block.
1875 So we record the decl in the standard fashion. */
1876 decl = pushdecl (decl);
1878 /* No need to call objc_check_decl here - it's a function type. */
1879 rest_of_decl_compilation (decl, NULL, 0, 0);
1881 /* Write a record describing this implicit function declaration
1882 to the prototypes file (if requested). */
1883 gen_aux_info_record (decl, 0, 1, 0);
1885 /* Possibly apply some default attributes to this implicit declaration. */
1886 decl_attributes (&decl, NULL_TREE, 0);
1892 implicit_decl_warning (tree id)
1894 const char *name = IDENTIFIER_POINTER (id);
1895 if (mesg_implicit_function_declaration == 2)
1896 error ("implicit declaration of function `%s'", name);
1897 else if (mesg_implicit_function_declaration == 1)
1898 warning ("implicit declaration of function `%s'", name);
1901 /* Issue an error message for a reference to an undeclared variable
1902 ID, including a reference to a builtin outside of function-call
1903 context. Establish a binding of the identifier to error_mark_node
1904 in an appropriate scope, which will suppress further errors for the
1907 undeclared_variable (tree id)
1909 static bool already = false;
1910 struct c_scope *scope;
1912 if (current_function_decl == 0)
1914 error ("`%s' undeclared here (not in a function)",
1915 IDENTIFIER_POINTER (id));
1916 scope = current_scope;
1920 error ("`%s' undeclared (first use in this function)",
1921 IDENTIFIER_POINTER (id));
1925 error ("(Each undeclared identifier is reported only once");
1926 error ("for each function it appears in.)");
1930 scope = current_function_scope;
1933 scope->shadowed = tree_cons (id, IDENTIFIER_SYMBOL_VALUE (id),
1935 IDENTIFIER_SYMBOL_VALUE (id) = error_mark_node;
1938 /* Subroutine of lookup_label, declare_label, define_label: construct a
1939 LABEL_DECL with all the proper frills. */
1942 make_label (tree name, location_t location)
1944 tree label = build_decl (LABEL_DECL, name, void_type_node);
1946 DECL_CONTEXT (label) = current_function_decl;
1947 DECL_MODE (label) = VOIDmode;
1948 DECL_SOURCE_LOCATION (label) = location;
1953 /* Another subroutine of lookup_label, declare_label, define_label:
1954 set up the binding of name to LABEL_DECL in the given SCOPE. */
1957 bind_label (tree name, tree label, struct c_scope *scope)
1959 if (IDENTIFIER_LABEL_VALUE (name))
1960 scope->shadowed = tree_cons (name, IDENTIFIER_LABEL_VALUE (name),
1962 IDENTIFIER_LABEL_VALUE (name) = label;
1964 SCOPE_LIST_APPEND (scope, names, label);
1967 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
1968 Create one if none exists so far for the current function.
1969 This is called when a label is used in a goto expression or
1970 has its address taken. */
1973 lookup_label (tree name)
1977 if (current_function_decl == 0)
1979 error ("label %s referenced outside of any function",
1980 IDENTIFIER_POINTER (name));
1984 /* Use a label already defined or ref'd with this name, but not if
1985 it is inherited from a containing function and wasn't declared
1987 label = IDENTIFIER_LABEL_VALUE (name);
1988 if (label && (DECL_CONTEXT (label) == current_function_decl
1989 || C_DECLARED_LABEL_FLAG (label)))
1991 /* If the label has only been declared, update its apparent
1992 location to point here, for better diagnostics if it
1993 turns out not to have been defined. */
1994 if (!TREE_USED (label))
1995 DECL_SOURCE_LOCATION (label) = input_location;
1999 /* No label binding for that identifier; make one. */
2000 label = make_label (name, input_location);
2002 /* Ordinary labels go in the current function scope. */
2003 bind_label (name, label, current_function_scope);
2007 /* Make a label named NAME in the current function, shadowing silently
2008 any that may be inherited from containing functions or containing
2009 scopes. This is called for __label__ declarations. */
2011 /* Note that valid use, if the label being shadowed comes from another
2012 scope in the same function, requires calling declare_nonlocal_label
2013 right away. (Is this still true? -zw 2003-07-17) */
2016 declare_label (tree name)
2018 tree label = IDENTIFIER_LABEL_VALUE (name);
2021 /* Check to make sure that the label hasn't already been declared
2023 for (dup = current_scope->names; dup; dup = TREE_CHAIN (dup))
2026 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2027 error ("%Jthis is a previous declaration", dup);
2029 /* Just use the previous declaration. */
2033 label = make_label (name, input_location);
2034 C_DECLARED_LABEL_FLAG (label) = 1;
2036 /* Declared labels go in the current scope. */
2037 bind_label (name, label, current_scope);
2041 /* Define a label, specifying the location in the source file.
2042 Return the LABEL_DECL node for the label, if the definition is valid.
2043 Otherwise return 0. */
2046 define_label (location_t location, tree name)
2050 /* Find any preexisting label with this name. It is an error
2051 if that label has already been defined in this function, or
2052 if there is a containing function with a declared label with
2054 label = IDENTIFIER_LABEL_VALUE (name);
2057 && ((DECL_CONTEXT (label) == current_function_decl
2058 && DECL_INITIAL (label) != 0)
2059 || (DECL_CONTEXT (label) != current_function_decl
2060 && C_DECLARED_LABEL_FLAG (label))))
2062 error ("%Hduplicate label `%D'", &location, label);
2063 if (DECL_INITIAL (label))
2064 error ("%J`%D' previously defined here", label, label);
2066 error ("%J`%D' previously declared here", label, label);
2069 else if (label && DECL_CONTEXT (label) == current_function_decl)
2071 /* The label has been used or declared already in this function,
2072 but not defined. Update its location to point to this
2074 DECL_SOURCE_LOCATION (label) = location;
2078 /* No label binding for that identifier; make one. */
2079 label = make_label (name, location);
2081 /* Ordinary labels go in the current function scope. */
2082 bind_label (name, label, current_function_scope);
2085 if (warn_traditional && !in_system_header && lookup_name (name))
2086 warning ("%Htraditional C lacks a separate namespace for labels, "
2087 "identifier `%s' conflicts", &location,
2088 IDENTIFIER_POINTER (name));
2090 /* Mark label as having been defined. */
2091 DECL_INITIAL (label) = error_mark_node;
2095 /* Return the list of declarations of the current scope. */
2100 return current_scope->names;
2104 /* Given NAME, an IDENTIFIER_NODE,
2105 return the structure (or union or enum) definition for that name.
2106 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2107 CODE says which kind of type the caller wants;
2108 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2109 If the wrong kind of type is found, an error is reported. */
2112 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2114 tree tag = IDENTIFIER_TAG_VALUE (name);
2120 /* We only care about whether it's in this level if
2121 thislevel_only was set or it might be a type clash. */
2122 if (thislevel_only || TREE_CODE (tag) != code)
2124 if (current_scope == global_scope
2125 || purpose_member (name, current_scope->tags))
2129 if (thislevel_only && !thislevel)
2132 if (TREE_CODE (tag) != code)
2134 /* Definition isn't the kind we were looking for. */
2135 pending_invalid_xref = name;
2136 pending_invalid_xref_location = input_location;
2138 /* If in the same binding level as a declaration as a tag
2139 of a different type, this must not be allowed to
2140 shadow that tag, so give the error immediately.
2141 (For example, "struct foo; union foo;" is invalid.) */
2143 pending_xref_error ();
2148 /* Print an error message now
2149 for a recent invalid struct, union or enum cross reference.
2150 We don't print them immediately because they are not invalid
2151 when used in the `struct foo;' construct for shadowing. */
2154 pending_xref_error (void)
2156 if (pending_invalid_xref != 0)
2157 error ("%H`%s' defined as wrong kind of tag",
2158 &pending_invalid_xref_location,
2159 IDENTIFIER_POINTER (pending_invalid_xref));
2160 pending_invalid_xref = 0;
2164 /* Look up NAME in the current scope and its superiors
2165 in the namespace of variables, functions and typedefs.
2166 Return a ..._DECL node of some kind representing its definition,
2167 or return 0 if it is undefined. */
2170 lookup_name (tree name)
2172 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2173 if (decl == 0 || decl == error_mark_node)
2175 if (C_DECL_INVISIBLE (decl))
2180 /* Similar to `lookup_name' but look only at the current scope. */
2183 lookup_name_current_level (tree name)
2185 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2187 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2190 if (current_scope == global_scope)
2193 /* Scan the current scope for a decl with name NAME.
2194 For PARM_DECLs, we have to look at both ->parms and ->names, since
2195 forward parameter declarations wind up on the ->names list. */
2196 if (TREE_CODE (decl) == PARM_DECL
2197 && chain_member (decl, current_scope->parms))
2199 if (chain_member (decl, current_scope->names))
2205 /* Create the predefined scalar types of C,
2206 and some nodes representing standard constants (0, 1, (void *) 0).
2207 Initialize the global scope.
2208 Make definitions for built-in primitive functions. */
2211 c_init_decl_processing (void)
2214 tree ptr_ftype_void, ptr_ftype_ptr;
2215 location_t save_loc = input_location;
2217 /* Adds some ggc roots, and reserved words for c-parse.in. */
2220 current_function_decl = 0;
2222 /* Make the c_scope structure for global names. */
2224 global_scope = current_scope;
2226 /* Declarations from c_common_nodes_and_builtins must not be associated
2227 with this input file, lest we get differences between using and not
2228 using preprocessed headers. */
2229 input_location.file = "<internal>";
2230 input_location.line = 0;
2232 /* Make the DECL for the toplevel file scope. */
2233 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
2235 build_common_tree_nodes (flag_signed_char);
2237 c_common_nodes_and_builtins ();
2239 /* In C, comparisons and TRUTH_* expressions have type int. */
2240 truthvalue_type_node = integer_type_node;
2241 truthvalue_true_node = integer_one_node;
2242 truthvalue_false_node = integer_zero_node;
2244 /* Even in C99, which has a real boolean type. */
2245 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2246 boolean_type_node));
2248 endlink = void_list_node;
2249 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2251 = build_function_type (ptr_type_node,
2252 tree_cons (NULL_TREE, ptr_type_node, endlink));
2254 input_location = save_loc;
2256 pedantic_lvalues = pedantic;
2258 make_fname_decl = c_make_fname_decl;
2259 start_fname_decls ();
2261 first_builtin_decl = global_scope->names;
2262 last_builtin_decl = global_scope->names_last;
2265 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2266 decl, NAME is the initialization string and TYPE_DEP indicates whether
2267 NAME depended on the type of the function. As we don't yet implement
2268 delayed emission of static data, we mark the decl as emitted
2269 so it is not placed in the output. Anything using it must therefore pull
2270 out the STRING_CST initializer directly. FIXME. */
2273 c_make_fname_decl (tree id, int type_dep)
2275 const char *name = fname_as_string (type_dep);
2276 tree decl, type, init;
2277 size_t length = strlen (name);
2279 type = build_array_type
2280 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2281 build_index_type (size_int (length)));
2283 decl = build_decl (VAR_DECL, id, type);
2285 TREE_STATIC (decl) = 1;
2286 TREE_READONLY (decl) = 1;
2287 DECL_ARTIFICIAL (decl) = 1;
2289 init = build_string (length + 1, name);
2290 TREE_TYPE (init) = type;
2291 DECL_INITIAL (decl) = init;
2293 TREE_USED (decl) = 1;
2295 if (current_function_decl)
2297 DECL_CONTEXT (decl) = current_function_decl;
2298 IDENTIFIER_SYMBOL_VALUE (id) = decl;
2299 SCOPE_LIST_APPEND (current_function_scope, names, decl);
2302 finish_decl (decl, init, NULL_TREE);
2307 /* Return a definition for a builtin function named NAME and whose data type
2308 is TYPE. TYPE should be a function type with argument types.
2309 FUNCTION_CODE tells later passes how to compile calls to this function.
2310 See tree.h for its possible values.
2312 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2313 the name to be called if we can't opencode the function. If
2314 ATTRS is nonzero, use that for the function's attribute list. */
2317 builtin_function (const char *name, tree type, int function_code,
2318 enum built_in_class class, const char *library_name,
2321 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2322 DECL_EXTERNAL (decl) = 1;
2323 TREE_PUBLIC (decl) = 1;
2325 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2326 make_decl_rtl (decl, NULL);
2328 DECL_BUILT_IN_CLASS (decl) = class;
2329 DECL_FUNCTION_CODE (decl) = function_code;
2331 /* Warn if a function in the namespace for users
2332 is used without an occasion to consider it declared. */
2333 if (name[0] != '_' || name[1] != '_')
2334 C_DECL_INVISIBLE (decl) = 1;
2336 /* Possibly apply some default attributes to this built-in function. */
2338 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2340 decl_attributes (&decl, NULL_TREE, 0);
2345 /* Called when a declaration is seen that contains no names to declare.
2346 If its type is a reference to a structure, union or enum inherited
2347 from a containing scope, shadow that tag name for the current scope
2348 with a forward reference.
2349 If its type defines a new named structure or union
2350 or defines an enum, it is valid but we need not do anything here.
2351 Otherwise, it is an error. */
2354 shadow_tag (tree declspecs)
2356 shadow_tag_warned (declspecs, 0);
2360 shadow_tag_warned (tree declspecs, int warned)
2363 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2370 pending_invalid_xref = 0;
2372 /* Remove the attributes from declspecs, since they will confuse the
2374 split_specs_attrs (declspecs, &specs, &attrs);
2376 for (link = specs; link; link = TREE_CHAIN (link))
2378 tree value = TREE_VALUE (link);
2379 enum tree_code code = TREE_CODE (value);
2381 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2382 /* Used to test also that TYPE_SIZE (value) != 0.
2383 That caused warning for `struct foo;' at top level in the file. */
2385 tree name = TYPE_NAME (value);
2392 if (warned != 1 && code != ENUMERAL_TYPE)
2393 /* Empty unnamed enum OK */
2395 pedwarn ("unnamed struct/union that defines no instances");
2401 t = lookup_tag (code, name, 1);
2405 t = make_node (code);
2412 if (!warned && ! in_system_header)
2414 warning ("useless keyword or type name in empty declaration");
2421 error ("two types specified in one empty declaration");
2426 pedwarn ("empty declaration");
2430 /* Construct an array declarator. EXPR is the expression inside [], or
2431 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2432 to the pointer to which a parameter array is converted). STATIC_P is
2433 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2434 is nonzero is the array is [*], a VLA of unspecified length which is
2435 nevertheless a complete type (not currently implemented by GCC),
2436 zero otherwise. The declarator is constructed as an ARRAY_REF
2437 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2438 left of the [] (filled by in set_array_declarator_type) and operand 1
2439 is the expression inside; whose TREE_TYPE is the type qualifiers and
2440 which has TREE_STATIC set if "static" is used. */
2443 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2446 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2447 TREE_TYPE (decl) = quals;
2448 TREE_STATIC (decl) = (static_p ? 1 : 0);
2449 if (pedantic && !flag_isoc99)
2451 if (static_p || quals != NULL_TREE)
2452 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2454 pedwarn ("ISO C90 does not support `[*]' array declarators");
2457 warning ("GCC does not yet properly implement `[*]' array declarators");
2461 /* Set the type of an array declarator. DECL is the declarator, as
2462 constructed by build_array_declarator; TYPE is what appears on the left
2463 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2464 abstract declarator, zero otherwise; this is used to reject static and
2465 type qualifiers in abstract declarators, where they are not in the
2469 set_array_declarator_type (tree decl, tree type, int abstract_p)
2471 TREE_OPERAND (decl, 0) = type;
2472 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2473 error ("static or type qualifiers in abstract declarator");
2477 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2480 groktypename (tree typename)
2484 if (TREE_CODE (typename) != TREE_LIST)
2487 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2489 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0,
2492 /* Apply attributes. */
2493 decl_attributes (&typename, attrs, 0);
2498 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2501 groktypename_in_parm_context (tree typename)
2503 if (TREE_CODE (typename) != TREE_LIST)
2505 return grokdeclarator (TREE_VALUE (typename),
2506 TREE_PURPOSE (typename),
2510 /* Decode a declarator in an ordinary declaration or data definition.
2511 This is called as soon as the type information and variable name
2512 have been parsed, before parsing the initializer if any.
2513 Here we create the ..._DECL node, fill in its type,
2514 and put it on the list of decls for the current context.
2515 The ..._DECL node is returned as the value.
2517 Exception: for arrays where the length is not specified,
2518 the type is left null, to be filled in by `finish_decl'.
2520 Function definitions do not come here; they go to start_function
2521 instead. However, external and forward declarations of functions
2522 do go through here. Structure field declarations are done by
2523 grokfield and not through here. */
2526 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2531 /* An object declared as __attribute__((deprecated)) suppresses
2532 warnings of uses of other deprecated items. */
2533 if (lookup_attribute ("deprecated", attributes))
2534 deprecated_state = DEPRECATED_SUPPRESS;
2536 decl = grokdeclarator (declarator, declspecs,
2537 NORMAL, initialized, NULL);
2539 deprecated_state = DEPRECATED_NORMAL;
2541 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2542 && MAIN_NAME_P (DECL_NAME (decl)))
2543 warning ("%J'%D' is usually a function", decl, decl);
2546 /* Is it valid for this decl to have an initializer at all?
2547 If not, set INITIALIZED to zero, which will indirectly
2548 tell `finish_decl' to ignore the initializer once it is parsed. */
2549 switch (TREE_CODE (decl))
2552 error ("typedef `%s' is initialized (use __typeof__ instead)",
2553 IDENTIFIER_POINTER (DECL_NAME (decl)));
2558 error ("function `%s' is initialized like a variable",
2559 IDENTIFIER_POINTER (DECL_NAME (decl)));
2564 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2565 error ("parameter `%s' is initialized",
2566 IDENTIFIER_POINTER (DECL_NAME (decl)));
2571 /* Don't allow initializations for incomplete types
2572 except for arrays which might be completed by the initialization. */
2574 /* This can happen if the array size is an undefined macro. We already
2575 gave a warning, so we don't need another one. */
2576 if (TREE_TYPE (decl) == error_mark_node)
2578 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2580 /* A complete type is ok if size is fixed. */
2582 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2583 || C_DECL_VARIABLE_SIZE (decl))
2585 error ("variable-sized object may not be initialized");
2589 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2591 error ("variable `%s' has initializer but incomplete type",
2592 IDENTIFIER_POINTER (DECL_NAME (decl)));
2595 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2597 error ("elements of array `%s' have incomplete type",
2598 IDENTIFIER_POINTER (DECL_NAME (decl)));
2605 DECL_EXTERNAL (decl) = 0;
2606 if (current_scope == global_scope)
2607 TREE_STATIC (decl) = 1;
2609 /* Tell `pushdecl' this is an initialized decl
2610 even though we don't yet have the initializer expression.
2611 Also tell `finish_decl' it may store the real initializer. */
2612 DECL_INITIAL (decl) = error_mark_node;
2615 /* If this is a function declaration, write a record describing it to the
2616 prototypes file (if requested). */
2618 if (TREE_CODE (decl) == FUNCTION_DECL)
2619 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2621 /* ANSI specifies that a tentative definition which is not merged with
2622 a non-tentative definition behaves exactly like a definition with an
2623 initializer equal to zero. (Section 3.7.2)
2625 -fno-common gives strict ANSI behavior, though this tends to break
2626 a large body of code that grew up without this rule.
2628 Thread-local variables are never common, since there's no entrenched
2629 body of code to break, and it allows more efficient variable references
2630 in the presence of dynamic linking. */
2632 if (TREE_CODE (decl) == VAR_DECL
2634 && TREE_PUBLIC (decl)
2635 && !DECL_THREAD_LOCAL (decl)
2637 DECL_COMMON (decl) = 1;
2639 /* Set attributes here so if duplicate decl, will have proper attributes. */
2640 decl_attributes (&decl, attributes, 0);
2642 if (TREE_CODE (decl) == FUNCTION_DECL
2643 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2645 tree ce = declarator;
2647 if (TREE_CODE (ce) == INDIRECT_REF)
2648 ce = TREE_OPERAND (declarator, 0);
2649 if (TREE_CODE (ce) == CALL_EXPR)
2651 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2652 for (; args; args = TREE_CHAIN (args))
2654 tree type = TREE_TYPE (args);
2655 if (INTEGRAL_TYPE_P (type)
2656 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2657 DECL_ARG_TYPE (args) = integer_type_node;
2662 if (TREE_CODE (decl) == FUNCTION_DECL
2663 && DECL_DECLARED_INLINE_P (decl)
2664 && DECL_UNINLINABLE (decl)
2665 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2666 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2668 /* Add this decl to the current scope.
2669 TEM may equal DECL or it may be a previous decl of the same name. */
2670 tem = pushdecl (decl);
2672 /* For a local variable, define the RTL now. */
2673 if (current_scope != global_scope
2674 /* But not if this is a duplicate decl
2675 and we preserved the rtl from the previous one
2676 (which may or may not happen). */
2677 && !DECL_RTL_SET_P (tem)
2678 && DECL_FILE_SCOPE_P (tem))
2680 if (TREE_TYPE (tem) != error_mark_node
2681 && (COMPLETE_TYPE_P (TREE_TYPE (tem))
2682 || (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2683 && DECL_INITIAL (tem) != 0)))
2690 /* Finish processing of a declaration;
2691 install its initial value.
2692 If the length of an array type is not known before,
2693 it must be determined now, from the initial value, or it is an error. */
2696 finish_decl (tree decl, tree init, tree asmspec_tree)
2698 tree type = TREE_TYPE (decl);
2699 int was_incomplete = (DECL_SIZE (decl) == 0);
2700 const char *asmspec = 0;
2702 /* If a name was specified, get the string. */
2703 if (current_scope == global_scope)
2704 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2706 asmspec = TREE_STRING_POINTER (asmspec_tree);
2708 /* If `start_decl' didn't like having an initialization, ignore it now. */
2709 if (init != 0 && DECL_INITIAL (decl) == 0)
2712 /* Don't crash if parm is initialized. */
2713 if (TREE_CODE (decl) == PARM_DECL)
2717 store_init_value (decl, init);
2719 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
2720 || TREE_CODE (decl) == FUNCTION_DECL
2721 || TREE_CODE (decl) == FIELD_DECL))
2722 objc_check_decl (decl);
2724 /* Deduce size of array from initialization, if not already known. */
2725 if (TREE_CODE (type) == ARRAY_TYPE
2726 && TYPE_DOMAIN (type) == 0
2727 && TREE_CODE (decl) != TYPE_DECL)
2730 = (TREE_STATIC (decl)
2731 /* Even if pedantic, an external linkage array
2732 may have incomplete type at first. */
2733 ? pedantic && !TREE_PUBLIC (decl)
2734 : !DECL_EXTERNAL (decl));
2736 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2738 /* Get the completed type made by complete_array_type. */
2739 type = TREE_TYPE (decl);
2742 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2744 else if (failure == 2)
2747 error ("%Jarray size missing in '%D'", decl, decl);
2748 /* If a `static' var's size isn't known,
2749 make it extern as well as static, so it does not get
2751 If it is not `static', then do not mark extern;
2752 finish_incomplete_decl will give it a default size
2753 and it will get allocated. */
2754 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2755 DECL_EXTERNAL (decl) = 1;
2758 /* TYPE_MAX_VALUE is always one less than the number of elements
2759 in the array, because we start counting at zero. Therefore,
2760 warn only if the value is less than zero. */
2761 else if (pedantic && TYPE_DOMAIN (type) != 0
2762 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2763 error ("%Jzero or negative size array '%D'", decl, decl);
2765 layout_decl (decl, 0);
2768 if (TREE_CODE (decl) == VAR_DECL)
2770 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2771 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2772 layout_decl (decl, 0);
2774 if (DECL_SIZE (decl) == 0
2775 /* Don't give an error if we already gave one earlier. */
2776 && TREE_TYPE (decl) != error_mark_node
2777 && (TREE_STATIC (decl)
2779 /* A static variable with an incomplete type
2780 is an error if it is initialized.
2781 Also if it is not file scope.
2782 Otherwise, let it through, but if it is not `extern'
2783 then it may cause an error message later. */
2784 (DECL_INITIAL (decl) != 0
2785 || !DECL_FILE_SCOPE_P (decl))
2787 /* An automatic variable with an incomplete type
2789 !DECL_EXTERNAL (decl)))
2791 error ("%Jstorage size of '%D' isn't known", decl, decl);
2792 TREE_TYPE (decl) = error_mark_node;
2795 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2796 && DECL_SIZE (decl) != 0)
2798 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2799 constant_expression_warning (DECL_SIZE (decl));
2801 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2804 if (TREE_USED (type))
2805 TREE_USED (decl) = 1;
2808 /* If this is a function and an assembler name is specified, reset DECL_RTL
2809 so we can give it its new name. Also, update built_in_decls if it
2810 was a normal built-in. */
2811 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2813 /* ASMSPEC is given, and not the name of a register. Mark the
2814 name with a star so assemble_name won't munge it. */
2815 char *starred = alloca (strlen (asmspec) + 2);
2817 strcpy (starred + 1, asmspec);
2819 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2821 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2822 SET_DECL_RTL (builtin, NULL_RTX);
2823 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2824 #ifdef TARGET_MEM_FUNCTIONS
2825 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2826 init_block_move_fn (starred);
2827 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2828 init_block_clear_fn (starred);
2830 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2831 init_block_move_fn (starred);
2832 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2833 init_block_clear_fn (starred);
2836 SET_DECL_RTL (decl, NULL_RTX);
2837 change_decl_assembler_name (decl, get_identifier (starred));
2840 /* If #pragma weak was used, mark the decl weak now. */
2841 if (current_scope == global_scope)
2842 maybe_apply_pragma_weak (decl);
2844 /* Output the assembler code and/or RTL code for variables and functions,
2845 unless the type is an undefined structure or union.
2846 If not, it will get done when the type is completed. */
2848 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2850 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2851 if (c_dialect_objc ())
2852 objc_check_decl (decl);
2854 if (DECL_FILE_SCOPE_P (decl))
2856 if (DECL_INITIAL (decl) == NULL_TREE
2857 || DECL_INITIAL (decl) == error_mark_node)
2858 /* Don't output anything
2859 when a tentative file-scope definition is seen.
2860 But at end of compilation, do output code for them. */
2861 DECL_DEFER_OUTPUT (decl) = 1;
2862 rest_of_decl_compilation (decl, asmspec, true, 0);
2866 /* This is a local variable. If there is an ASMSPEC, the
2867 user has requested that we handle it specially. */
2870 /* In conjunction with an ASMSPEC, the `register'
2871 keyword indicates that we should place the variable
2872 in a particular register. */
2873 if (DECL_REGISTER (decl))
2874 DECL_C_HARD_REGISTER (decl) = 1;
2876 /* If this is not a static variable, issue a warning.
2877 It doesn't make any sense to give an ASMSPEC for an
2878 ordinary, non-register local variable. Historically,
2879 GCC has accepted -- but ignored -- the ASMSPEC in
2881 if (TREE_CODE (decl) == VAR_DECL
2882 && !DECL_REGISTER (decl)
2883 && !TREE_STATIC (decl))
2884 warning ("%Jignoring asm-specifier for non-static local "
2885 "variable '%D'", decl, decl);
2887 change_decl_assembler_name (decl, get_identifier (asmspec));
2890 if (TREE_CODE (decl) != FUNCTION_DECL)
2891 add_decl_stmt (decl);
2894 if (!DECL_FILE_SCOPE_P (decl))
2896 /* Recompute the RTL of a local array now
2897 if it used to be an incomplete type. */
2899 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2901 /* If we used it already as memory, it must stay in memory. */
2902 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2903 /* If it's still incomplete now, no init will save it. */
2904 if (DECL_SIZE (decl) == 0)
2905 DECL_INITIAL (decl) = 0;
2910 /* If this was marked 'used', be sure it will be output. */
2911 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2912 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2914 if (TREE_CODE (decl) == TYPE_DECL)
2915 rest_of_decl_compilation (decl, NULL, DECL_FILE_SCOPE_P (decl), 0);
2917 /* At the end of a declaration, throw away any variable type sizes
2918 of types defined inside that declaration. There is no use
2919 computing them in the following function definition. */
2920 if (current_scope == global_scope)
2921 get_pending_sizes ();
2923 /* Install a cleanup (aka destructor) if one was given. */
2924 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2926 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2929 static bool eh_initialized_p;
2931 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2932 tree cleanup_decl = lookup_name (cleanup_id);
2935 /* Build "cleanup(&decl)" for the destructor. */
2936 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2937 cleanup = build_tree_list (NULL_TREE, cleanup);
2938 cleanup = build_function_call (cleanup_decl, cleanup);
2940 /* Don't warn about decl unused; the cleanup uses it. */
2941 TREE_USED (decl) = 1;
2943 /* Initialize EH, if we've been told to do so. */
2944 if (flag_exceptions && !eh_initialized_p)
2946 eh_initialized_p = true;
2947 eh_personality_libfunc
2948 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
2949 ? "__gcc_personality_sj0"
2950 : "__gcc_personality_v0");
2951 using_eh_for_cleanups ();
2954 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
2959 /* Given a parsed parameter declaration, decode it into a PARM_DECL
2960 and push that on the current scope. */
2963 push_parm_decl (tree parm)
2966 int old_dont_save_pending_sizes_p = 0;
2968 /* Don't attempt to expand sizes while parsing this decl.
2969 (We can get here with i_s_e 1 somehow from Objective-C.) */
2970 int save_immediate_size_expand = immediate_size_expand;
2971 immediate_size_expand = 0;
2973 /* If this is a nested function, we do want to keep SAVE_EXPRs for
2974 the argument sizes, regardless of the parent's setting. */
2977 old_dont_save_pending_sizes_p = cfun->x_dont_save_pending_sizes_p;
2978 cfun->x_dont_save_pending_sizes_p = 0;
2981 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
2982 TREE_PURPOSE (TREE_PURPOSE (parm)),
2984 decl_attributes (&decl, TREE_VALUE (parm), 0);
2986 decl = pushdecl (decl);
2988 finish_decl (decl, NULL_TREE, NULL_TREE);
2991 cfun->x_dont_save_pending_sizes_p = old_dont_save_pending_sizes_p;
2992 immediate_size_expand = save_immediate_size_expand;
2995 /* Mark all the parameter declarations to date as forward decls,
2996 shift them to the variables list, and reset the parameters list.
2997 Also diagnose use of this extension. */
3000 mark_forward_parm_decls (void)
3004 if (pedantic && !current_scope->warned_forward_parm_decls)
3006 pedwarn ("ISO C forbids forward parameter declarations");
3007 current_scope->warned_forward_parm_decls = true;
3010 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
3011 TREE_ASM_WRITTEN (parm) = 1;
3013 SCOPE_LIST_CONCAT (current_scope, names, current_scope, parms);
3014 current_scope->parms = 0;
3015 current_scope->parms_last = 0;
3018 static GTY(()) int compound_literal_number;
3020 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3021 literal, which may be an incomplete array type completed by the
3022 initializer; INIT is a CONSTRUCTOR that initializes the compound
3026 build_compound_literal (tree type, tree init)
3028 /* We do not use start_decl here because we have a type, not a declarator;
3029 and do not use finish_decl because the decl should be stored inside
3030 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3031 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3034 DECL_EXTERNAL (decl) = 0;
3035 TREE_PUBLIC (decl) = 0;
3036 TREE_STATIC (decl) = (current_scope == global_scope);
3037 DECL_CONTEXT (decl) = current_function_decl;
3038 TREE_USED (decl) = 1;
3039 TREE_TYPE (decl) = type;
3040 TREE_READONLY (decl) = TREE_READONLY (type);
3041 store_init_value (decl, init);
3043 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3045 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3050 type = TREE_TYPE (decl);
3051 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3052 return error_mark_node;
3054 stmt = build_stmt (DECL_STMT, decl);
3055 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3056 TREE_SIDE_EFFECTS (complit) = 1;
3058 layout_decl (decl, 0);
3060 if (TREE_STATIC (decl))
3062 /* This decl needs a name for the assembler output. We also need
3063 a unique suffix to be added to the name. */
3066 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3067 compound_literal_number);
3068 compound_literal_number++;
3069 DECL_NAME (decl) = get_identifier (name);
3070 DECL_DEFER_OUTPUT (decl) = 1;
3071 DECL_COMDAT (decl) = 1;
3072 DECL_ARTIFICIAL (decl) = 1;
3074 rest_of_decl_compilation (decl, NULL, 1, 0);
3080 /* Make TYPE a complete type based on INITIAL_VALUE.
3081 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3082 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3085 complete_array_type (tree type, tree initial_value, int do_default)
3087 tree maxindex = NULL_TREE;
3092 /* Note MAXINDEX is really the maximum index,
3093 one less than the size. */
3094 if (TREE_CODE (initial_value) == STRING_CST)
3097 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3098 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3101 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3103 tree elts = CONSTRUCTOR_ELTS (initial_value);
3104 maxindex = build_int_2 (-1, -1);
3105 for (; elts; elts = TREE_CHAIN (elts))
3107 if (TREE_PURPOSE (elts))
3108 maxindex = TREE_PURPOSE (elts);
3110 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3111 maxindex, integer_one_node));
3113 maxindex = copy_node (maxindex);
3117 /* Make an error message unless that happened already. */
3118 if (initial_value != error_mark_node)
3121 /* Prevent further error messages. */
3122 maxindex = build_int_2 (0, 0);
3129 maxindex = build_int_2 (0, 0);
3135 TYPE_DOMAIN (type) = build_index_type (maxindex);
3136 if (!TREE_TYPE (maxindex))
3137 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3140 /* Lay out the type now that we can get the real answer. */
3147 /* Determine whether TYPE is a structure with a flexible array member,
3148 or a union containing such a structure (possibly recursively). */
3151 flexible_array_type_p (tree type)
3154 switch (TREE_CODE (type))
3157 x = TYPE_FIELDS (type);
3160 while (TREE_CHAIN (x) != NULL_TREE)
3162 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3163 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3164 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3165 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3169 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3171 if (flexible_array_type_p (TREE_TYPE (x)))
3180 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3181 replacing with appropriate values if they are invalid. */
3183 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3186 unsigned int max_width;
3187 unsigned HOST_WIDE_INT w;
3188 const char *name = orig_name ? orig_name: _("<anonymous>");
3191 STRIP_NOPS (*width);
3193 /* Detect and ignore out of range field width and process valid
3195 if (TREE_CODE (*width) != INTEGER_CST)
3197 error ("bit-field `%s' width not an integer constant", name);
3198 *width = integer_one_node;
3202 constant_expression_warning (*width);
3203 if (tree_int_cst_sgn (*width) < 0)
3205 error ("negative width in bit-field `%s'", name);
3206 *width = integer_one_node;
3208 else if (integer_zerop (*width) && orig_name)
3210 error ("zero width for bit-field `%s'", name);
3211 *width = integer_one_node;
3215 /* Detect invalid bit-field type. */
3216 if (TREE_CODE (*type) != INTEGER_TYPE
3217 && TREE_CODE (*type) != BOOLEAN_TYPE
3218 && TREE_CODE (*type) != ENUMERAL_TYPE)
3220 error ("bit-field `%s' has invalid type", name);
3221 *type = unsigned_type_node;
3224 type_mv = TYPE_MAIN_VARIANT (*type);
3226 && type_mv != integer_type_node
3227 && type_mv != unsigned_type_node
3228 && type_mv != boolean_type_node)
3229 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3231 if (type_mv == boolean_type_node)
3232 max_width = CHAR_TYPE_SIZE;
3234 max_width = TYPE_PRECISION (*type);
3236 if (0 < compare_tree_int (*width, max_width))
3238 error ("width of `%s' exceeds its type", name);
3240 *width = build_int_2 (w, 0);
3243 w = tree_low_cst (*width, 1);
3245 if (TREE_CODE (*type) == ENUMERAL_TYPE
3246 && (w < min_precision (TYPE_MIN_VALUE (*type), TREE_UNSIGNED (*type))
3247 || w < min_precision (TYPE_MAX_VALUE (*type), TREE_UNSIGNED (*type))))
3248 warning ("`%s' is narrower than values of its type", name);
3251 /* Given declspecs and a declarator,
3252 determine the name and type of the object declared
3253 and construct a ..._DECL node for it.
3254 (In one case we can return a ..._TYPE node instead.
3255 For invalid input we sometimes return 0.)
3257 DECLSPECS is a chain of tree_list nodes whose value fields
3258 are the storage classes and type specifiers.
3260 DECL_CONTEXT says which syntactic context this declaration is in:
3261 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3262 FUNCDEF for a function definition. Like NORMAL but a few different
3263 error messages in each case. Return value may be zero meaning
3264 this definition is too screwy to try to parse.
3265 PARM for a parameter declaration (either within a function prototype
3266 or before a function body). Make a PARM_DECL, or return void_type_node.
3267 TYPENAME if for a typename (in a cast or sizeof).
3268 Don't make a DECL node; just return the ..._TYPE node.
3269 FIELD for a struct or union field; make a FIELD_DECL.
3270 INITIALIZED is 1 if the decl has an initializer.
3271 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3272 representing the width of the bit-field.
3274 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3275 It may also be so in the PARM case, for a prototype where the
3276 argument type is specified but not the name.
3278 This function is where the complicated C meanings of `static'
3279 and `extern' are interpreted. */
3282 grokdeclarator (tree declarator, tree declspecs,
3283 enum decl_context decl_context, int initialized, tree *width)
3287 tree type = NULL_TREE;
3292 int type_quals = TYPE_UNQUALIFIED;
3294 int explicit_int = 0;
3295 int explicit_char = 0;
3296 int defaulted_int = 0;
3297 tree typedef_decl = 0;
3298 const char *name, *orig_name;
3299 tree typedef_type = 0;
3300 int funcdef_flag = 0;
3301 enum tree_code innermost_code = ERROR_MARK;
3302 int size_varies = 0;
3303 tree decl_attr = NULL_TREE;
3304 tree array_ptr_quals = NULL_TREE;
3305 int array_parm_static = 0;
3306 tree returned_attrs = NULL_TREE;
3307 bool bitfield = width != NULL;
3310 if (decl_context == FUNCDEF)
3311 funcdef_flag = 1, decl_context = NORMAL;
3313 /* Look inside a declarator for the name being declared
3314 and get it as a string, for an error message. */
3316 tree decl = declarator;
3320 switch (TREE_CODE (decl))
3325 innermost_code = TREE_CODE (decl);
3326 decl = TREE_OPERAND (decl, 0);
3330 decl = TREE_VALUE (decl);
3333 case IDENTIFIER_NODE:
3334 name = IDENTIFIER_POINTER (decl);
3346 /* A function definition's declarator must have the form of
3347 a function declarator. */
3349 if (funcdef_flag && innermost_code != CALL_EXPR)
3352 /* If this looks like a function definition, make it one,
3353 even if it occurs where parms are expected.
3354 Then store_parm_decls will reject it and not use it as a parm. */
3355 if (decl_context == NORMAL && !funcdef_flag
3356 && current_scope->parm_flag)
3357 decl_context = PARM;
3359 /* Look through the decl specs and record which ones appear.
3360 Some typespecs are defined as built-in typenames.
3361 Others, the ones that are modifiers of other types,
3362 are represented by bits in SPECBITS: set the bits for
3363 the modifiers that appear. Storage class keywords are also in SPECBITS.
3365 If there is a typedef name or a type, store the type in TYPE.
3366 This includes builtin typedefs such as `int'.
3368 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3369 and did not come from a user typedef.
3371 Set LONGLONG if `long' is mentioned twice. */
3373 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3375 tree id = TREE_VALUE (spec);
3377 /* If the entire declaration is itself tagged as deprecated then
3378 suppress reports of deprecated items. */
3379 if (id && TREE_DEPRECATED (id))
3381 if (deprecated_state != DEPRECATED_SUPPRESS)
3382 warn_deprecated_use (id);
3385 if (id == ridpointers[(int) RID_INT])
3387 if (id == ridpointers[(int) RID_CHAR])
3390 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3392 enum rid i = C_RID_CODE (id);
3393 if ((int) i <= (int) RID_LAST_MODIFIER)
3395 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3398 error ("`long long long' is too long for GCC");
3401 if (pedantic && !flag_isoc99 && ! in_system_header
3403 pedwarn ("ISO C90 does not support `long long'");
3407 else if (specbits & (1 << (int) i))
3409 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3411 if (pedantic && !flag_isoc99)
3412 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3415 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3418 /* Diagnose "__thread extern". Recall that this list
3419 is in the reverse order seen in the text. */
3421 && (specbits & (1 << (int) RID_EXTERN
3422 | 1 << (int) RID_STATIC)))
3424 if (specbits & 1 << (int) RID_EXTERN)
3425 error ("`__thread' before `extern'");
3427 error ("`__thread' before `static'");
3430 specbits |= 1 << (int) i;
3435 error ("two or more data types in declaration of `%s'", name);
3436 /* Actual typedefs come to us as TYPE_DECL nodes. */
3437 else if (TREE_CODE (id) == TYPE_DECL)
3439 if (TREE_TYPE (id) == error_mark_node)
3440 ; /* Allow the type to default to int to avoid cascading errors. */
3443 type = TREE_TYPE (id);
3444 decl_attr = DECL_ATTRIBUTES (id);
3448 /* Built-in types come as identifiers. */
3449 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3451 tree t = lookup_name (id);
3452 if (TREE_TYPE (t) == error_mark_node)
3454 else if (!t || TREE_CODE (t) != TYPE_DECL)
3455 error ("`%s' fails to be a typedef or built in type",
3456 IDENTIFIER_POINTER (id));
3459 type = TREE_TYPE (t);
3463 else if (TREE_CODE (id) != ERROR_MARK)
3470 typedef_type = type;
3472 size_varies = C_TYPE_VARIABLE_SIZE (type);
3474 /* No type at all: default to `int', and set DEFAULTED_INT
3475 because it was not a user-defined typedef. */
3479 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3480 | (1 << (int) RID_SIGNED)
3481 | (1 << (int) RID_UNSIGNED)
3482 | (1 << (int) RID_COMPLEX))))
3483 /* Don't warn about typedef foo = bar. */
3484 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3485 && ! in_system_header)
3487 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3488 and this is a function, or if -Wimplicit; prefer the former
3489 warning since it is more explicit. */
3490 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3492 warn_about_return_type = 1;
3493 else if (warn_implicit_int || flag_isoc99)
3494 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3499 type = integer_type_node;
3502 /* Now process the modifiers that were specified
3503 and check for invalid combinations. */
3505 /* Long double is a special combination. */
3507 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3508 && TYPE_MAIN_VARIANT (type) == double_type_node)
3510 specbits &= ~(1 << (int) RID_LONG);
3511 type = long_double_type_node;
3514 /* Check all other uses of type modifiers. */
3516 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3517 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3521 if ((specbits & 1 << (int) RID_LONG)
3522 && (specbits & 1 << (int) RID_SHORT))
3523 error ("both long and short specified for `%s'", name);
3524 else if (((specbits & 1 << (int) RID_LONG)
3525 || (specbits & 1 << (int) RID_SHORT))
3527 error ("long or short specified with char for `%s'", name);
3528 else if (((specbits & 1 << (int) RID_LONG)
3529 || (specbits & 1 << (int) RID_SHORT))
3530 && TREE_CODE (type) == REAL_TYPE)
3532 static int already = 0;
3534 error ("long or short specified with floating type for `%s'", name);
3535 if (! already && ! pedantic)
3537 error ("the only valid combination is `long double'");
3541 else if ((specbits & 1 << (int) RID_SIGNED)
3542 && (specbits & 1 << (int) RID_UNSIGNED))
3543 error ("both signed and unsigned specified for `%s'", name);
3544 else if (TREE_CODE (type) != INTEGER_TYPE)
3545 error ("long, short, signed or unsigned invalid for `%s'", name);
3549 if (!explicit_int && !defaulted_int && !explicit_char)
3551 error ("long, short, signed or unsigned used invalidly for `%s'",
3557 /* Discard the type modifiers if they are invalid. */
3560 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3561 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3566 if ((specbits & (1 << (int) RID_COMPLEX))
3567 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3569 error ("complex invalid for `%s'", name);
3570 specbits &= ~(1 << (int) RID_COMPLEX);
3573 /* Decide whether an integer type is signed or not.
3574 Optionally treat bit-fields as signed by default. */
3575 if (specbits & 1 << (int) RID_UNSIGNED
3576 || (bitfield && ! flag_signed_bitfields
3577 && (explicit_int || defaulted_int || explicit_char
3578 /* A typedef for plain `int' without `signed'
3579 can be controlled just like plain `int'. */
3580 || ! (typedef_decl != 0
3581 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3582 && TREE_CODE (type) != ENUMERAL_TYPE
3583 && !(specbits & 1 << (int) RID_SIGNED)))
3586 type = long_long_unsigned_type_node;
3587 else if (specbits & 1 << (int) RID_LONG)
3588 type = long_unsigned_type_node;
3589 else if (specbits & 1 << (int) RID_SHORT)
3590 type = short_unsigned_type_node;
3591 else if (type == char_type_node)
3592 type = unsigned_char_type_node;
3593 else if (typedef_decl)
3594 type = c_common_unsigned_type (type);
3596 type = unsigned_type_node;
3598 else if ((specbits & 1 << (int) RID_SIGNED)
3599 && type == char_type_node)
3600 type = signed_char_type_node;
3602 type = long_long_integer_type_node;
3603 else if (specbits & 1 << (int) RID_LONG)
3604 type = long_integer_type_node;
3605 else if (specbits & 1 << (int) RID_SHORT)
3606 type = short_integer_type_node;
3608 if (specbits & 1 << (int) RID_COMPLEX)
3610 if (pedantic && !flag_isoc99)
3611 pedwarn ("ISO C90 does not support complex types");
3612 /* If we just have "complex", it is equivalent to
3613 "complex double", but if any modifiers at all are specified it is
3614 the complex form of TYPE. E.g, "complex short" is
3615 "complex short int". */
3617 if (defaulted_int && ! longlong
3618 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3619 | (1 << (int) RID_SIGNED)
3620 | (1 << (int) RID_UNSIGNED))))
3623 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3624 type = complex_double_type_node;
3626 else if (type == integer_type_node)
3629 pedwarn ("ISO C does not support complex integer types");
3630 type = complex_integer_type_node;
3632 else if (type == float_type_node)
3633 type = complex_float_type_node;
3634 else if (type == double_type_node)
3635 type = complex_double_type_node;
3636 else if (type == long_double_type_node)
3637 type = complex_long_double_type_node;
3641 pedwarn ("ISO C does not support complex integer types");
3642 type = build_complex_type (type);
3646 /* Figure out the type qualifiers for the declaration. There are
3647 two ways a declaration can become qualified. One is something
3648 like `const int i' where the `const' is explicit. Another is
3649 something like `typedef const int CI; CI i' where the type of the
3650 declaration contains the `const'. A third possibility is that
3651 there is a type qualifier on the element type of a typedefed
3652 array type, in which case we should extract that qualifier so
3653 that c_apply_type_quals_to_decls receives the full list of
3654 qualifiers to work with (C90 is not entirely clear about whether
3655 duplicate qualifiers should be diagnosed in this case, but it
3656 seems most appropriate to do so). */
3657 element_type = strip_array_types (type);
3658 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3660 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3662 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3663 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3664 if (pedantic && !flag_isoc99)
3667 pedwarn ("duplicate `const'");
3669 pedwarn ("duplicate `restrict'");
3671 pedwarn ("duplicate `volatile'");
3673 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3674 type = TYPE_MAIN_VARIANT (type);
3675 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3676 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3677 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3679 /* Warn if two storage classes are given. Default to `auto'. */
3684 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3685 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3686 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3687 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3688 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3690 /* "static __thread" and "extern __thread" are allowed. */
3691 if ((specbits & (1 << (int) RID_THREAD
3692 | 1 << (int) RID_STATIC
3693 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3696 /* Warn about storage classes that are invalid for certain
3697 kinds of declarations (parameters, typenames, etc.). */
3700 error ("multiple storage classes in declaration of `%s'", name);
3701 else if (funcdef_flag
3703 & ((1 << (int) RID_REGISTER)
3704 | (1 << (int) RID_AUTO)
3705 | (1 << (int) RID_TYPEDEF)
3706 | (1 << (int) RID_THREAD))))
3708 if (specbits & 1 << (int) RID_AUTO
3709 && (pedantic || current_scope == global_scope))
3710 pedwarn ("function definition declared `auto'");
3711 if (specbits & 1 << (int) RID_REGISTER)
3712 error ("function definition declared `register'");
3713 if (specbits & 1 << (int) RID_TYPEDEF)
3714 error ("function definition declared `typedef'");
3715 if (specbits & 1 << (int) RID_THREAD)
3716 error ("function definition declared `__thread'");
3717 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3718 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3720 else if (decl_context != NORMAL && nclasses > 0)
3722 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3726 switch (decl_context)
3729 error ("storage class specified for structure field `%s'",
3733 error ("storage class specified for parameter `%s'", name);
3736 error ("storage class specified for typename");
3739 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3740 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3741 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3744 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3746 /* `extern' with initialization is invalid if not at file scope. */
3747 if (current_scope == global_scope)
3748 warning ("`%s' initialized and declared `extern'", name);
3750 error ("`%s' has both `extern' and initializer", name);
3752 else if (current_scope == global_scope)
3754 if (specbits & 1 << (int) RID_AUTO)
3755 error ("file-scope declaration of `%s' specifies `auto'", name);
3759 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3760 error ("nested function `%s' declared `extern'", name);
3761 else if ((specbits & (1 << (int) RID_THREAD
3762 | 1 << (int) RID_EXTERN
3763 | 1 << (int) RID_STATIC))
3764 == (1 << (int) RID_THREAD))
3766 error ("function-scope `%s' implicitly auto and declared `__thread'",
3768 specbits &= ~(1 << (int) RID_THREAD);
3773 /* Now figure out the structure of the declarator proper.
3774 Descend through it, creating more complex types, until we reach
3775 the declared identifier (or NULL_TREE, in an absolute declarator). */
3777 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3779 if (type == error_mark_node)
3781 declarator = TREE_OPERAND (declarator, 0);
3785 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3786 an INDIRECT_REF (for *...),
3787 a CALL_EXPR (for ...(...)),
3788 a TREE_LIST (for nested attributes),
3789 an identifier (for the name being declared)
3790 or a null pointer (for the place in an absolute declarator
3791 where the name was omitted).
3792 For the last two cases, we have just exited the loop.
3794 At this point, TYPE is the type of elements of an array,
3795 or for a function to return, or for a pointer to point to.
3796 After this sequence of ifs, TYPE is the type of the
3797 array or function or pointer, and DECLARATOR has had its
3798 outermost layer removed. */
3800 if (array_ptr_quals != NULL_TREE || array_parm_static)
3802 /* Only the innermost declarator (making a parameter be of
3803 array type which is converted to pointer type)
3804 may have static or type qualifiers. */
3805 error ("static or type qualifiers in non-parameter array declarator");
3806 array_ptr_quals = NULL_TREE;
3807 array_parm_static = 0;
3810 if (TREE_CODE (declarator) == TREE_LIST)
3812 /* We encode a declarator with embedded attributes using
3814 tree attrs = TREE_PURPOSE (declarator);
3817 declarator = TREE_VALUE (declarator);
3818 inner_decl = declarator;
3819 while (inner_decl != NULL_TREE
3820 && TREE_CODE (inner_decl) == TREE_LIST)
3821 inner_decl = TREE_VALUE (inner_decl);
3822 if (inner_decl == NULL_TREE
3823 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3824 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3825 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3826 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3827 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3828 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3829 returned_attrs = decl_attributes (&type,
3830 chainon (returned_attrs, attrs),
3833 else if (TREE_CODE (declarator) == ARRAY_REF)
3835 tree itype = NULL_TREE;
3836 tree size = TREE_OPERAND (declarator, 1);
3837 /* The index is a signed object `sizetype' bits wide. */
3838 tree index_type = c_common_signed_type (sizetype);
3840 array_ptr_quals = TREE_TYPE (declarator);
3841 array_parm_static = TREE_STATIC (declarator);
3843 declarator = TREE_OPERAND (declarator, 0);
3845 /* Check for some types that there cannot be arrays of. */
3847 if (VOID_TYPE_P (type))
3849 error ("declaration of `%s' as array of voids", name);
3850 type = error_mark_node;
3853 if (TREE_CODE (type) == FUNCTION_TYPE)
3855 error ("declaration of `%s' as array of functions", name);
3856 type = error_mark_node;
3859 if (pedantic && !in_system_header && flexible_array_type_p (type))
3860 pedwarn ("invalid use of structure with flexible array member");
3862 if (size == error_mark_node)
3863 type = error_mark_node;
3865 if (type == error_mark_node)
3868 /* If size was specified, set ITYPE to a range-type for that size.
3869 Otherwise, ITYPE remains null. finish_decl may figure it out
3870 from an initial value. */
3874 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3875 STRIP_TYPE_NOPS (size);
3877 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3879 error ("size of array `%s' has non-integer type", name);
3880 size = integer_one_node;
3883 if (pedantic && integer_zerop (size))
3884 pedwarn ("ISO C forbids zero-size array `%s'", name);
3886 if (TREE_CODE (size) == INTEGER_CST)
3888 constant_expression_warning (size);
3889 if (tree_int_cst_sgn (size) < 0)
3891 error ("size of array `%s' is negative", name);
3892 size = integer_one_node;
3897 /* Make sure the array size remains visibly nonconstant
3898 even if it is (eg) a const variable with known value. */
3901 if (!flag_isoc99 && pedantic)
3903 if (TREE_CONSTANT (size))
3904 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3907 pedwarn ("ISO C90 forbids variable-size array `%s'",
3912 if (integer_zerop (size))
3914 /* A zero-length array cannot be represented with an
3915 unsigned index type, which is what we'll get with
3916 build_index_type. Create an open-ended range instead. */
3917 itype = build_range_type (sizetype, size, NULL_TREE);
3921 /* Compute the maximum valid index, that is, size - 1.
3922 Do the calculation in index_type, so that if it is
3923 a variable the computations will be done in the
3925 itype = fold (build (MINUS_EXPR, index_type,
3926 convert (index_type, size),
3927 convert (index_type, size_one_node)));
3929 /* If that overflowed, the array is too big.
3930 ??? While a size of INT_MAX+1 technically shouldn't
3931 cause an overflow (because we subtract 1), the overflow
3932 is recorded during the conversion to index_type, before
3933 the subtraction. Handling this case seems like an
3934 unnecessary complication. */
3935 if (TREE_OVERFLOW (itype))
3937 error ("size of array `%s' is too large", name);
3938 type = error_mark_node;
3944 /* We must be able to distinguish the
3945 SAVE_EXPR_CONTEXT for the variably-sized type
3946 so that we can set it correctly in
3947 set_save_expr_context. The convention is
3948 that all SAVE_EXPRs that need to be reset
3949 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3950 tree cfd = current_function_decl;
3951 if (decl_context == PARM)
3952 current_function_decl = NULL_TREE;
3953 itype = variable_size (itype);
3954 if (decl_context == PARM)
3955 current_function_decl = cfd;
3957 itype = build_index_type (itype);
3960 else if (decl_context == FIELD)
3962 if (pedantic && !flag_isoc99 && !in_system_header)
3963 pedwarn ("ISO C90 does not support flexible array members");
3965 /* ISO C99 Flexible array members are effectively identical
3966 to GCC's zero-length array extension. */
3967 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3970 /* If pedantic, complain about arrays of incomplete types. */
3972 if (pedantic && !COMPLETE_TYPE_P (type))
3973 pedwarn ("array type has incomplete element type");
3975 /* Build the array type itself, then merge any constancy or
3976 volatility into the target type. We must do it in this order
3977 to ensure that the TYPE_MAIN_VARIANT field of the array type
3978 is set correctly. */
3980 type = build_array_type (type, itype);
3982 type = c_build_qualified_type (type, type_quals);
3985 C_TYPE_VARIABLE_SIZE (type) = 1;
3987 /* The GCC extension for zero-length arrays differs from
3988 ISO flexible array members in that sizeof yields zero. */
3989 if (size && integer_zerop (size))
3992 TYPE_SIZE (type) = bitsize_zero_node;
3993 TYPE_SIZE_UNIT (type) = size_zero_node;
3995 if (decl_context != PARM
3996 && (array_ptr_quals != NULL_TREE || array_parm_static))
3998 error ("static or type qualifiers in non-parameter array declarator");
3999 array_ptr_quals = NULL_TREE;
4000 array_parm_static = 0;
4003 else if (TREE_CODE (declarator) == CALL_EXPR)
4005 /* Say it's a definition only for the declarator closest to
4006 the identifier, apart possibly from some attributes. */
4007 bool really_funcdef = false;
4011 tree t = TREE_OPERAND (declarator, 0);
4012 while (TREE_CODE (t) == TREE_LIST)
4014 really_funcdef = (TREE_CODE (t) == IDENTIFIER_NODE);
4017 /* Declaring a function type.
4018 Make sure we have a valid type for the function to return. */
4019 if (type == error_mark_node)
4024 /* Warn about some types functions can't return. */
4026 if (TREE_CODE (type) == FUNCTION_TYPE)
4028 error ("`%s' declared as function returning a function", name);
4029 type = integer_type_node;
4031 if (TREE_CODE (type) == ARRAY_TYPE)
4033 error ("`%s' declared as function returning an array", name);
4034 type = integer_type_node;
4037 /* Construct the function type and go to the next
4038 inner layer of declarator. */
4040 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4042 /* Type qualifiers before the return type of the function
4043 qualify the return type, not the function type. */
4046 /* Type qualifiers on a function return type are normally
4047 permitted by the standard but have no effect, so give a
4048 warning at -Wextra. Qualifiers on a void return type have
4049 meaning as a GNU extension, and are banned on function
4050 definitions in ISO C. FIXME: strictly we shouldn't
4051 pedwarn for qualified void return types except on function
4052 definitions, but not doing so could lead to the undesirable
4053 state of a "volatile void" function return type not being
4054 warned about, and a use of the function being compiled
4055 with GNU semantics, with no diagnostics under -pedantic. */
4056 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4057 pedwarn ("ISO C forbids qualified void function return type");
4058 else if (extra_warnings
4059 && !(VOID_TYPE_P (type)
4060 && type_quals == TYPE_QUAL_VOLATILE))
4061 warning ("type qualifiers ignored on function return type");
4063 type = c_build_qualified_type (type, type_quals);
4065 type_quals = TYPE_UNQUALIFIED;
4067 type = build_function_type (type, arg_types);
4068 declarator = TREE_OPERAND (declarator, 0);
4070 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4071 the formal parameter list of this FUNCTION_TYPE to point to
4072 the FUNCTION_TYPE node itself. */
4077 for (link = last_function_parm_tags;
4079 link = TREE_CHAIN (link))
4080 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4083 else if (TREE_CODE (declarator) == INDIRECT_REF)
4085 /* Merge any constancy or volatility into the target type
4088 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4090 pedwarn ("ISO C forbids qualified function types");
4092 type = c_build_qualified_type (type, type_quals);
4093 type_quals = TYPE_UNQUALIFIED;
4096 type = build_pointer_type (type);
4098 /* Process a list of type modifier keywords
4099 (such as const or volatile) that were given inside the `*'. */
4101 if (TREE_TYPE (declarator))
4109 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4110 typemodlist = TREE_CHAIN (typemodlist))
4112 tree qualifier = TREE_VALUE (typemodlist);
4114 if (C_IS_RESERVED_WORD (qualifier))
4116 if (C_RID_CODE (qualifier) == RID_CONST)
4118 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4120 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4130 error ("invalid type modifier within pointer declarator");
4131 if (pedantic && !flag_isoc99)
4134 pedwarn ("duplicate `const'");
4136 pedwarn ("duplicate `volatile'");
4138 pedwarn ("duplicate `restrict'");
4141 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4142 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4143 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4146 declarator = TREE_OPERAND (declarator, 0);
4153 /* Now TYPE has the actual type. */
4155 /* Check the type and width of a bit-field. */
4157 check_bitfield_type_and_width (&type, width, orig_name);
4159 /* Did array size calculations overflow? */
4161 if (TREE_CODE (type) == ARRAY_TYPE
4162 && COMPLETE_TYPE_P (type)
4163 && TREE_OVERFLOW (TYPE_SIZE (type)))
4165 error ("size of array `%s' is too large", name);
4166 /* If we proceed with the array type as it is, we'll eventually
4167 crash in tree_low_cst(). */
4168 type = error_mark_node;
4171 /* If this is declaring a typedef name, return a TYPE_DECL. */
4173 if (specbits & (1 << (int) RID_TYPEDEF))
4176 /* Note that the grammar rejects storage classes
4177 in typenames, fields or parameters */
4178 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4180 pedwarn ("ISO C forbids qualified function types");
4182 type = c_build_qualified_type (type, type_quals);
4183 decl = build_decl (TYPE_DECL, declarator, type);
4184 if ((specbits & (1 << (int) RID_SIGNED))
4185 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4186 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4187 decl_attributes (&decl, returned_attrs, 0);
4191 /* Detect the case of an array type of unspecified size
4192 which came, as such, direct from a typedef name.
4193 We must copy the type, so that each identifier gets
4194 a distinct type, so that each identifier's size can be
4195 controlled separately by its own initializer. */
4197 if (type != 0 && typedef_type != 0
4198 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4199 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4201 type = build_array_type (TREE_TYPE (type), 0);
4203 C_TYPE_VARIABLE_SIZE (type) = 1;
4206 /* If this is a type name (such as, in a cast or sizeof),
4207 compute the type and return it now. */
4209 if (decl_context == TYPENAME)
4211 /* Note that the grammar rejects storage classes
4212 in typenames, fields or parameters */
4213 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4215 pedwarn ("ISO C forbids const or volatile function types");
4217 type = c_build_qualified_type (type, type_quals);
4218 decl_attributes (&type, returned_attrs, 0);
4222 /* Aside from typedefs and type names (handle above),
4223 `void' at top level (not within pointer)
4224 is allowed only in public variables.
4225 We don't complain about parms either, but that is because
4226 a better error message can be made later. */
4228 if (VOID_TYPE_P (type) && decl_context != PARM
4229 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4230 && ((specbits & (1 << (int) RID_EXTERN))
4231 || (current_scope == global_scope
4233 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4235 error ("variable or field `%s' declared void", name);
4236 type = integer_type_node;
4239 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4240 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4245 if (decl_context == PARM)
4247 tree type_as_written;
4250 /* A parameter declared as an array of T is really a pointer to T.
4251 One declared as a function is really a pointer to a function. */
4253 if (TREE_CODE (type) == ARRAY_TYPE)
4255 /* Transfer const-ness of array into that of type pointed to. */
4256 type = TREE_TYPE (type);
4258 type = c_build_qualified_type (type, type_quals);
4259 type = build_pointer_type (type);
4260 type_quals = TYPE_UNQUALIFIED;
4261 if (array_ptr_quals)
4263 tree new_ptr_quals, new_ptr_attrs;
4265 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4266 /* We don't yet implement attributes in this context. */
4267 if (new_ptr_attrs != NULL_TREE)
4268 warning ("attributes in parameter array declarator ignored");
4273 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4275 tree qualifier = TREE_VALUE (new_ptr_quals);
4277 if (C_IS_RESERVED_WORD (qualifier))
4279 if (C_RID_CODE (qualifier) == RID_CONST)
4281 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4283 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4293 error ("invalid type modifier within array declarator");
4295 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4296 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4297 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4301 else if (TREE_CODE (type) == FUNCTION_TYPE)
4303 if (pedantic && type_quals)
4304 pedwarn ("ISO C forbids qualified function types");
4306 type = c_build_qualified_type (type, type_quals);
4307 type = build_pointer_type (type);
4308 type_quals = TYPE_UNQUALIFIED;
4310 else if (type_quals)
4311 type = c_build_qualified_type (type, type_quals);
4313 type_as_written = type;
4315 decl = build_decl (PARM_DECL, declarator, type);
4317 C_DECL_VARIABLE_SIZE (decl) = 1;
4319 /* Compute the type actually passed in the parmlist,
4320 for the case where there is no prototype.
4321 (For example, shorts and chars are passed as ints.)
4322 When there is a prototype, this is overridden later. */
4324 if (type == error_mark_node)
4325 promoted_type = type;
4327 promoted_type = c_type_promotes_to (type);
4329 DECL_ARG_TYPE (decl) = promoted_type;
4330 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4332 else if (decl_context == FIELD)
4334 /* Structure field. It may not be a function. */
4336 if (TREE_CODE (type) == FUNCTION_TYPE)
4338 error ("field `%s' declared as a function", name);
4339 type = build_pointer_type (type);
4341 else if (TREE_CODE (type) != ERROR_MARK
4342 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4344 error ("field `%s' has incomplete type", name);
4345 type = error_mark_node;
4347 /* Move type qualifiers down to element of an array. */
4348 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4349 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4351 TYPE_DOMAIN (type));
4352 decl = build_decl (FIELD_DECL, declarator, type);
4353 DECL_NONADDRESSABLE_P (decl) = bitfield;
4356 C_DECL_VARIABLE_SIZE (decl) = 1;
4358 else if (TREE_CODE (type) == FUNCTION_TYPE)
4360 /* Every function declaration is "external"
4361 except for those which are inside a function body
4362 in which `auto' is used.
4363 That is a case not specified by ANSI C,
4364 and we use it for forward declarations for nested functions. */
4365 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4366 || current_scope == global_scope);
4368 if (specbits & (1 << (int) RID_AUTO)
4369 && (pedantic || current_scope == global_scope))
4370 pedwarn ("invalid storage class for function `%s'", name);
4371 if (specbits & (1 << (int) RID_REGISTER))
4372 error ("invalid storage class for function `%s'", name);
4373 if (specbits & (1 << (int) RID_THREAD))
4374 error ("invalid storage class for function `%s'", name);
4375 /* Function declaration not at file scope.
4376 Storage classes other than `extern' are not allowed
4377 and `extern' makes no difference. */
4378 if (current_scope != global_scope
4379 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4381 pedwarn ("invalid storage class for function `%s'", name);
4383 decl = build_decl (FUNCTION_DECL, declarator, type);
4384 decl = build_decl_attribute_variant (decl, decl_attr);
4386 DECL_LANG_SPECIFIC (decl)
4387 = ggc_alloc_cleared (sizeof (struct lang_decl));
4389 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4390 pedwarn ("ISO C forbids qualified function types");
4392 /* GNU C interprets a `volatile void' return type to indicate
4393 that the function does not return. */
4394 if ((type_quals & TYPE_QUAL_VOLATILE)
4395 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4396 warning ("`noreturn' function returns non-void value");
4399 DECL_EXTERNAL (decl) = 1;
4400 /* Record absence of global scope for `static' or `auto'. */
4402 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4405 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4407 /* Record presence of `inline', if it is reasonable. */
4408 if (MAIN_NAME_P (declarator))
4411 warning ("cannot inline function `main'");
4415 /* Record that the function is declared `inline'. */
4416 DECL_DECLARED_INLINE_P (decl) = 1;
4418 /* Do not mark bare declarations as DECL_INLINE. Doing so
4419 in the presence of multiple declarations can result in
4420 the abstract origin pointing between the declarations,
4421 which will confuse dwarf2out. */
4424 DECL_INLINE (decl) = 1;
4425 if (specbits & (1 << (int) RID_EXTERN))
4426 current_extern_inline = 1;
4429 /* If -finline-functions, assume it can be inlined. This does
4430 two things: let the function be deferred until it is actually
4431 needed, and let dwarf2 know that the function is inlinable. */
4432 else if (flag_inline_trees == 2 && initialized)
4433 DECL_INLINE (decl) = 1;
4437 /* It's a variable. */
4438 /* An uninitialized decl with `extern' is a reference. */
4439 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4441 /* Move type qualifiers down to element of an array. */
4442 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4444 int saved_align = TYPE_ALIGN(type);
4445 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4447 TYPE_DOMAIN (type));
4448 TYPE_ALIGN (type) = saved_align;
4450 else if (type_quals)
4451 type = c_build_qualified_type (type, type_quals);
4453 /* It is invalid to create an `extern' declaration for a
4454 variable if there is a global declaration that is
4455 `static' and the global declaration is not visible. */
4456 if (extern_ref && current_scope != global_scope)
4460 global_decl = identifier_global_value (declarator);
4462 && TREE_CODE (global_decl) == VAR_DECL
4463 && lookup_name (declarator) != global_decl
4464 && !TREE_PUBLIC (global_decl))
4465 error ("variable previously declared `static' redeclared "
4469 decl = build_decl (VAR_DECL, declarator, type);
4471 C_DECL_VARIABLE_SIZE (decl) = 1;
4474 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4476 DECL_EXTERNAL (decl) = extern_ref;
4478 /* At file scope, the presence of a `static' or `register' storage
4479 class specifier, or the absence of all storage class specifiers
4480 makes this declaration a definition (perhaps tentative). Also,
4481 the absence of both `static' and `register' makes it public. */
4482 if (current_scope == global_scope)
4484 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4485 | (1 << (int) RID_REGISTER)));
4486 TREE_STATIC (decl) = !extern_ref;
4488 /* Not at file scope, only `static' makes a static definition. */
4491 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4492 TREE_PUBLIC (decl) = extern_ref;
4495 if (specbits & 1 << (int) RID_THREAD)
4497 if (targetm.have_tls)
4498 DECL_THREAD_LOCAL (decl) = 1;
4500 /* A mere warning is sure to result in improper semantics
4501 at runtime. Don't bother to allow this to compile. */
4502 error ("thread-local storage not supported for this target");
4506 /* Record `register' declaration for warnings on &
4507 and in case doing stupid register allocation. */
4509 if (specbits & (1 << (int) RID_REGISTER))
4510 DECL_REGISTER (decl) = 1;
4512 /* Record constancy and volatility. */
4513 c_apply_type_quals_to_decl (type_quals, decl);
4515 /* If a type has volatile components, it should be stored in memory.
4516 Otherwise, the fact that those components are volatile
4517 will be ignored, and would even crash the compiler. */
4518 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4519 c_mark_addressable (decl);
4521 #ifdef ENABLE_CHECKING
4522 /* This is the earliest point at which we might know the assembler
4523 name of a variable. Thus, if it's known before this, die horribly. */
4524 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4528 decl_attributes (&decl, returned_attrs, 0);
4534 /* Decode the parameter-list info for a function type or function definition.
4535 The argument is the value returned by `get_parm_info' (or made in parse.y
4536 if there is an identifier list instead of a parameter decl list).
4537 These two functions are separate because when a function returns
4538 or receives functions then each is called multiple times but the order
4539 of calls is different. The last call to `grokparms' is always the one
4540 that contains the formal parameter names of a function definition.
4542 Store in `last_function_parms' a chain of the decls of parms.
4543 Also store in `last_function_parm_tags' a chain of the struct, union,
4544 and enum tags declared among the parms.
4546 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4548 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4549 a mere declaration. A nonempty identifier-list gets an error message
4550 when FUNCDEF_FLAG is zero. */
4553 grokparms (tree parms_info, int funcdef_flag)
4555 tree first_parm = TREE_CHAIN (parms_info);
4557 last_function_parms = TREE_PURPOSE (parms_info);
4558 last_function_parm_tags = TREE_VALUE (parms_info);
4559 last_function_parm_others = TREE_TYPE (parms_info);
4561 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4562 && !in_system_header)
4563 warning ("function declaration isn't a prototype");
4566 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4569 pedwarn ("parameter names (without types) in function declaration");
4571 last_function_parms = first_parm;
4578 /* If the arg types are incomplete in a declaration,
4579 they must include undefined tags.
4580 These tags can never be defined in the scope of the declaration,
4581 so the types can never be completed,
4582 and no call can be compiled successfully. */
4584 for (parm = last_function_parms, typelt = first_parm;
4586 parm = TREE_CHAIN (parm))
4587 /* Skip over any enumeration constants declared here. */
4588 if (TREE_CODE (parm) == PARM_DECL)
4590 /* Barf if the parameter itself has an incomplete type. */
4591 tree type = TREE_VALUE (typelt);
4592 if (type == error_mark_node)
4594 if (!COMPLETE_TYPE_P (type))
4596 if (funcdef_flag && DECL_NAME (parm) != 0)
4597 error ("parameter `%s' has incomplete type",
4598 IDENTIFIER_POINTER (DECL_NAME (parm)));
4600 warning ("parameter has incomplete type");
4603 TREE_VALUE (typelt) = error_mark_node;
4604 TREE_TYPE (parm) = error_mark_node;
4607 typelt = TREE_CHAIN (typelt);
4614 /* Return a tree_list node with info on a parameter list just parsed.
4615 The TREE_PURPOSE is a list of decls of those parms.
4616 The TREE_VALUE is a list of structure, union and enum tags defined.
4617 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4618 The TREE_TYPE is a list of non-parameter decls which appeared with the
4620 This tree_list node is later fed to `grokparms'.
4622 VOID_AT_END nonzero means append `void' to the end of the type-list.
4623 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4626 get_parm_info (int void_at_end)
4628 tree decl, type, list;
4630 tree *last_type = &types;
4631 tree tags = current_scope->tags;
4632 tree parms = current_scope->parms;
4633 tree others = current_scope->names;
4634 static bool explained_incomplete_types = false;
4635 bool gave_void_only_once_err = false;
4637 /* Just "void" (and no ellipsis) is special. There are really no parms.
4638 But if the "void" is qualified (by "const" or "volatile"), or has a
4639 storage class specifier ("register"), then the behavior is undefined;
4640 issue an error. Typedefs for "void" are OK (see DR#157). */
4641 if (void_at_end && parms != 0
4642 && TREE_CHAIN (parms) == 0
4643 && VOID_TYPE_P (TREE_TYPE (parms))
4644 && !DECL_NAME (parms))
4646 if (TREE_THIS_VOLATILE (parms)
4647 || TREE_READONLY (parms)
4648 || DECL_REGISTER (parms))
4649 error ("\"void\" as only parameter may not be qualified");
4651 return tree_cons (0, 0, tree_cons (0, void_type_node, 0));
4654 /* Sanity check all of the parameter declarations. */
4655 for (decl = parms; decl; decl = TREE_CHAIN (decl))
4657 if (TREE_CODE (decl) != PARM_DECL)
4659 if (TREE_ASM_WRITTEN (decl))
4662 /* Since there is a prototype, args are passed in their
4663 declared types. The back end may override this. */
4664 type = TREE_TYPE (decl);
4665 DECL_ARG_TYPE (decl) = type;
4667 /* Check for (..., void, ...) and issue an error. */
4668 if (VOID_TYPE_P (type) && !DECL_NAME (decl) && !gave_void_only_once_err)
4670 error ("\"void\" must be the only parameter");
4671 gave_void_only_once_err = true;
4674 type = build_tree_list (0, type);
4676 last_type = &TREE_CHAIN (type);
4679 /* Check the list of non-parameter decls for any forward parm decls
4680 that never got real decls. */
4681 for (decl = others; decl; decl = TREE_CHAIN (decl))
4682 if (TREE_CODE (decl) == PARM_DECL)
4684 if (!TREE_ASM_WRITTEN (decl))
4687 error ("%Jparameter \"%D\" has just a forward declaration",
4691 /* Warn about any struct, union or enum tags defined within this
4692 list. The scope of such types is limited to this declaration,
4693 which is rarely if ever desirable (it's impossible to call such
4694 a function with type-correct arguments). */
4695 for (decl = tags; decl; decl = TREE_CHAIN (decl))
4697 enum tree_code code = TREE_CODE (TREE_VALUE (decl));
4698 const char *keyword;
4699 /* An anonymous union parm type is meaningful as a GNU extension.
4700 So don't warn for that. */
4701 if (code == UNION_TYPE && TREE_PURPOSE (decl) == 0 && !pedantic)
4704 /* The keyword should not be translated. */
4707 case RECORD_TYPE: keyword = "struct"; break;
4708 case UNION_TYPE: keyword = "union"; break;
4709 case ENUMERAL_TYPE: keyword = "enum"; break;
4713 if (TREE_PURPOSE (decl))
4714 /* The first %s will be one of 'struct', 'union', or 'enum'. */
4715 warning ("\"%s %s\" declared inside parameter list",
4716 keyword, IDENTIFIER_POINTER (TREE_PURPOSE (decl)));
4718 /* The %s will be one of 'struct', 'union', or 'enum'. */
4719 warning ("anonymous %s declared inside parameter list", keyword);
4721 if (! explained_incomplete_types)
4723 warning ("its scope is only this definition or declaration,"
4724 " which is probably not what you want");
4725 explained_incomplete_types = true;
4732 type = build_tree_list (0, void_type_node);
4736 list = tree_cons (parms, tags, types);
4737 TREE_TYPE (list) = others;
4741 /* Get the struct, enum or union (CODE says which) with tag NAME.
4742 Define the tag as a forward-reference if it is not defined. */
4745 xref_tag (enum tree_code code, tree name)
4747 /* If a cross reference is requested, look up the type
4748 already defined for this tag and return it. */
4750 tree ref = lookup_tag (code, name, 0);
4751 /* If this is the right type of tag, return what we found.
4752 (This reference will be shadowed by shadow_tag later if appropriate.)
4753 If this is the wrong type of tag, do not return it. If it was the
4754 wrong type in the same scope, we will have had an error
4755 message already; if in a different scope and declaring
4756 a name, pending_xref_error will give an error message; but if in a
4757 different scope and not declaring a name, this tag should
4758 shadow the previous declaration of a different type of tag, and
4759 this would not work properly if we return the reference found.
4760 (For example, with "struct foo" in an outer scope, "union foo;"
4761 must shadow that tag with a new one of union type.) */
4762 if (ref && TREE_CODE (ref) == code)
4765 /* If no such tag is yet defined, create a forward-reference node
4766 and record it as the "definition".
4767 When a real declaration of this type is found,
4768 the forward-reference will be altered into a real type. */
4770 ref = make_node (code);
4771 if (code == ENUMERAL_TYPE)
4773 /* Give the type a default layout like unsigned int
4774 to avoid crashing if it does not get defined. */
4775 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4776 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4777 TYPE_USER_ALIGN (ref) = 0;
4778 TREE_UNSIGNED (ref) = 1;
4779 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4780 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4781 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4784 pushtag (name, ref);
4789 /* Make sure that the tag NAME is defined *in the current scope*
4790 at least as a forward reference.
4791 CODE says which kind of tag NAME ought to be. */
4794 start_struct (enum tree_code code, tree name)
4796 /* If there is already a tag defined at this scope
4797 (as a forward reference), just return it. */
4802 ref = lookup_tag (code, name, 1);
4803 if (ref && TREE_CODE (ref) == code)
4805 if (TYPE_SIZE (ref))
4807 if (code == UNION_TYPE)
4808 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4810 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4812 else if (C_TYPE_BEING_DEFINED (ref))
4814 if (code == UNION_TYPE)
4815 error ("nested redefinition of `union %s'",
4816 IDENTIFIER_POINTER (name));
4818 error ("nested redefinition of `struct %s'",
4819 IDENTIFIER_POINTER (name));
4824 /* Otherwise create a forward-reference just so the tag is in scope. */
4826 ref = make_node (code);
4827 pushtag (name, ref);
4830 C_TYPE_BEING_DEFINED (ref) = 1;
4831 TYPE_PACKED (ref) = flag_pack_struct;
4835 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4836 of a structure component, returning a FIELD_DECL node.
4837 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4839 This is done during the parsing of the struct declaration.
4840 The FIELD_DECL nodes are chained together and the lot of them
4841 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4844 grokfield (tree declarator, tree declspecs, tree width)
4848 if (declarator == NULL_TREE && width == NULL_TREE)
4850 /* This is an unnamed decl.
4852 If we have something of the form "union { list } ;" then this
4853 is the anonymous union extension. Similarly for struct.
4855 If this is something of the form "struct foo;", then
4856 If MS extensions are enabled, this is handled as an
4858 Otherwise this is a forward declaration of a structure tag.
4860 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4861 If MS extensions are enabled and foo names a structure, then
4862 again this is an anonymous struct.
4863 Otherwise this is an error.
4865 Oh what a horrid tangled web we weave. I wonder if MS consciously
4866 took this from Plan 9 or if it was an accident of implementation
4867 that took root before someone noticed the bug... */
4869 tree type = TREE_VALUE (declspecs);
4871 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4872 type = TREE_TYPE (type);
4873 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4875 if (flag_ms_extensions)
4878 goto warn_unnamed_field;
4879 else if (TYPE_NAME (type) == NULL)
4882 goto warn_unnamed_field;
4887 warning ("declaration does not declare anything");
4892 value = grokdeclarator (declarator, declspecs, FIELD, 0,
4893 width ? &width : NULL);
4895 finish_decl (value, NULL_TREE, NULL_TREE);
4896 DECL_INITIAL (value) = width;
4901 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4902 the list such that this does not present a problem later. */
4905 detect_field_duplicates (tree fieldlist)
4910 /* First, see if there are more than "a few" fields.
4911 This is trivially true if there are zero or one fields. */
4914 x = TREE_CHAIN (fieldlist);
4920 } while (timeout > 0 && x);
4922 /* If there were "few" fields, avoid the overhead of allocating
4923 a hash table. Instead just do the nested traversal thing. */
4926 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4929 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4930 if (DECL_NAME (y) == DECL_NAME (x))
4932 error ("%Jduplicate member '%D'", x, x);
4933 DECL_NAME (x) = NULL_TREE;
4939 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4942 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4943 if ((y = DECL_NAME (x)) != 0)
4945 slot = htab_find_slot (htab, y, INSERT);
4948 error ("%Jduplicate member '%D'", x, x);
4949 DECL_NAME (x) = NULL_TREE;
4958 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4959 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4960 ATTRIBUTES are attributes to be applied to the structure. */
4963 finish_struct (tree t, tree fieldlist, tree attributes)
4966 int toplevel = global_scope == current_scope;
4967 int saw_named_field;
4969 /* If this type was previously laid out as a forward reference,
4970 make sure we lay it out again. */
4974 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4976 /* Nameless union parm types are useful as GCC extension. */
4977 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4978 /* Otherwise, warn about any struct or union def. in parmlist. */
4979 if (in_parm_level_p ())
4982 pedwarn ("%s defined inside parms",
4983 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4985 warning ("%s defined inside parms",
4986 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4991 for (x = fieldlist; x; x = TREE_CHAIN (x))
4992 if (DECL_NAME (x) != 0)
4996 pedwarn ("%s has no %s",
4997 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4998 fieldlist ? _("named members") : _("members"));
5001 /* Install struct as DECL_CONTEXT of each field decl.
5002 Also process specified field sizes,m which is found in the DECL_INITIAL.
5003 Store 0 there, except for ": 0" fields (so we can find them
5004 and delete them, below). */
5006 saw_named_field = 0;
5007 for (x = fieldlist; x; x = TREE_CHAIN (x))
5009 DECL_CONTEXT (x) = t;
5010 DECL_PACKED (x) |= TYPE_PACKED (t);
5012 /* If any field is const, the structure type is pseudo-const. */
5013 if (TREE_READONLY (x))
5014 C_TYPE_FIELDS_READONLY (t) = 1;
5017 /* A field that is pseudo-const makes the structure likewise. */
5018 tree t1 = TREE_TYPE (x);
5019 while (TREE_CODE (t1) == ARRAY_TYPE)
5020 t1 = TREE_TYPE (t1);
5021 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5022 && C_TYPE_FIELDS_READONLY (t1))
5023 C_TYPE_FIELDS_READONLY (t) = 1;
5026 /* Any field that is volatile means variables of this type must be
5027 treated in some ways as volatile. */
5028 if (TREE_THIS_VOLATILE (x))
5029 C_TYPE_FIELDS_VOLATILE (t) = 1;
5031 /* Any field of nominal variable size implies structure is too. */
5032 if (C_DECL_VARIABLE_SIZE (x))
5033 C_TYPE_VARIABLE_SIZE (t) = 1;
5035 if (DECL_INITIAL (x))
5037 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5038 DECL_SIZE (x) = bitsize_int (width);
5039 DECL_BIT_FIELD (x) = 1;
5040 SET_DECL_C_BIT_FIELD (x);
5043 DECL_INITIAL (x) = 0;
5045 /* Detect flexible array member in an invalid context. */
5046 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5047 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5048 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5049 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5051 if (TREE_CODE (t) == UNION_TYPE)
5053 error ("%Jflexible array member in union", x);
5054 TREE_TYPE (x) = error_mark_node;
5056 else if (TREE_CHAIN (x) != NULL_TREE)
5058 error ("%Jflexible array member not at end of struct", x);
5059 TREE_TYPE (x) = error_mark_node;
5061 else if (! saw_named_field)
5063 error ("%Jflexible array member in otherwise empty struct", x);
5064 TREE_TYPE (x) = error_mark_node;
5068 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5069 && flexible_array_type_p (TREE_TYPE (x)))
5070 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5073 saw_named_field = 1;
5076 detect_field_duplicates (fieldlist);
5078 /* Now we have the nearly final fieldlist. Record it,
5079 then lay out the structure or union (including the fields). */
5081 TYPE_FIELDS (t) = fieldlist;
5085 /* Delete all zero-width bit-fields from the fieldlist. */
5087 tree *fieldlistp = &fieldlist;
5089 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5090 *fieldlistp = TREE_CHAIN (*fieldlistp);
5092 fieldlistp = &TREE_CHAIN (*fieldlistp);
5095 /* Now we have the truly final field list.
5096 Store it in this type and in the variants. */
5098 TYPE_FIELDS (t) = fieldlist;
5100 /* If there are lots of fields, sort so we can look through them fast.
5101 We arbitrarily consider 16 or more elts to be "a lot". */
5106 for (x = fieldlist; x; x = TREE_CHAIN (x))
5108 if (len > 15 || DECL_NAME (x) == NULL)
5116 struct lang_type *space;
5117 struct sorted_fields_type *space2;
5119 len += list_length (x);
5121 /* Use the same allocation policy here that make_node uses, to
5122 ensure that this lives as long as the rest of the struct decl.
5123 All decls in an inline function need to be saved. */
5125 space = ggc_alloc (sizeof (struct lang_type));
5126 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5130 field_array = &space2->elts[0];
5131 for (x = fieldlist; x; x = TREE_CHAIN (x))
5133 field_array[len++] = x;
5135 /* If there is anonymous struct or union, break out of the loop. */
5136 if (DECL_NAME (x) == NULL)
5139 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5142 TYPE_LANG_SPECIFIC (t) = space;
5143 TYPE_LANG_SPECIFIC (t)->s->len = len;
5144 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5145 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5150 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5152 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5153 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5154 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5155 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5156 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5157 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5158 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5161 /* If this was supposed to be a transparent union, but we can't
5162 make it one, warn and turn off the flag. */
5163 if (TREE_CODE (t) == UNION_TYPE
5164 && TYPE_TRANSPARENT_UNION (t)
5165 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5167 TYPE_TRANSPARENT_UNION (t) = 0;
5168 warning ("union cannot be made transparent");
5171 /* If this structure or union completes the type of any previous
5172 variable declaration, lay it out and output its rtl. */
5173 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5177 tree decl = TREE_VALUE (x);
5178 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5179 layout_array_type (TREE_TYPE (decl));
5180 if (TREE_CODE (decl) != TYPE_DECL)
5182 layout_decl (decl, 0);
5183 if (c_dialect_objc ())
5184 objc_check_decl (decl);
5185 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5190 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5192 /* Finish debugging output for this type. */
5193 rest_of_type_compilation (t, toplevel);
5198 /* Lay out the type T, and its element type, and so on. */
5201 layout_array_type (tree t)
5203 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5204 layout_array_type (TREE_TYPE (t));
5208 /* Begin compiling the definition of an enumeration type.
5209 NAME is its name (or null if anonymous).
5210 Returns the type object, as yet incomplete.
5211 Also records info about it so that build_enumerator
5212 may be used to declare the individual values as they are read. */
5215 start_enum (tree name)
5219 /* If this is the real definition for a previous forward reference,
5220 fill in the contents in the same object that used to be the
5221 forward reference. */
5224 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5226 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5228 enumtype = make_node (ENUMERAL_TYPE);
5229 pushtag (name, enumtype);
5232 if (C_TYPE_BEING_DEFINED (enumtype))
5233 error ("nested redefinition of `enum %s'", IDENTIFIER_POINTER (name));
5235 C_TYPE_BEING_DEFINED (enumtype) = 1;
5237 if (TYPE_VALUES (enumtype) != 0)
5239 /* This enum is a named one that has been declared already. */
5240 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5242 /* Completely replace its old definition.
5243 The old enumerators remain defined, however. */
5244 TYPE_VALUES (enumtype) = 0;
5247 enum_next_value = integer_zero_node;
5250 if (flag_short_enums)
5251 TYPE_PACKED (enumtype) = 1;
5256 /* After processing and defining all the values of an enumeration type,
5257 install their decls in the enumeration type and finish it off.
5258 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5259 and ATTRIBUTES are the specified attributes.
5260 Returns ENUMTYPE. */
5263 finish_enum (tree enumtype, tree values, tree attributes)
5266 tree minnode = 0, maxnode = 0, enum_value_type;
5267 int precision, unsign;
5268 int toplevel = (global_scope == current_scope);
5270 if (in_parm_level_p ())
5271 warning ("enum defined inside parms");
5273 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5275 /* Calculate the maximum value of any enumerator in this type. */
5277 if (values == error_mark_node)
5278 minnode = maxnode = integer_zero_node;
5281 minnode = maxnode = TREE_VALUE (values);
5282 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5284 tree value = TREE_VALUE (pair);
5285 if (tree_int_cst_lt (maxnode, value))
5287 if (tree_int_cst_lt (value, minnode))
5292 /* Construct the final type of this enumeration. It is the same
5293 as one of the integral types - the narrowest one that fits, except
5294 that normally we only go as narrow as int - and signed iff any of
5295 the values are negative. */
5296 unsign = (tree_int_cst_sgn (minnode) >= 0);
5297 precision = MAX (min_precision (minnode, unsign),
5298 min_precision (maxnode, unsign));
5299 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5301 tree narrowest = c_common_type_for_size (precision, unsign);
5304 warning ("enumeration values exceed range of largest integer");
5305 narrowest = long_long_integer_type_node;
5308 precision = TYPE_PRECISION (narrowest);
5311 precision = TYPE_PRECISION (integer_type_node);
5313 if (precision == TYPE_PRECISION (integer_type_node))
5314 enum_value_type = c_common_type_for_size (precision, 0);
5316 enum_value_type = enumtype;
5318 TYPE_MIN_VALUE (enumtype) = minnode;
5319 TYPE_MAX_VALUE (enumtype) = maxnode;
5320 TREE_UNSIGNED (enumtype) = unsign;
5321 TYPE_SIZE (enumtype) = 0;
5323 /* If the precision of the type was specific with an attribute and it
5324 was too small, give an error. Otherwise, use it. */
5325 if (TYPE_PRECISION (enumtype))
5327 if (precision > TYPE_PRECISION (enumtype))
5328 error ("specified mode too small for enumeral values");
5331 TYPE_PRECISION (enumtype) = precision;
5333 layout_type (enumtype);
5335 if (values != error_mark_node)
5337 /* Change the type of the enumerators to be the enum type. We
5338 need to do this irrespective of the size of the enum, for
5339 proper type checking. Replace the DECL_INITIALs of the
5340 enumerators, and the value slots of the list, with copies
5341 that have the enum type; they cannot be modified in place
5342 because they may be shared (e.g. integer_zero_node) Finally,
5343 change the purpose slots to point to the names of the decls. */
5344 for (pair = values; pair; pair = TREE_CHAIN (pair))
5346 tree enu = TREE_PURPOSE (pair);
5348 TREE_TYPE (enu) = enumtype;
5350 /* The ISO C Standard mandates enumerators to have type int,
5351 even though the underlying type of an enum type is
5352 unspecified. Here we convert any enumerators that fit in
5353 an int to type int, to avoid promotions to unsigned types
5354 when comparing integers with enumerators that fit in the
5355 int range. When -pedantic is given, build_enumerator()
5356 would have already taken care of those that don't fit. */
5357 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5358 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5360 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5362 TREE_PURPOSE (pair) = DECL_NAME (enu);
5363 TREE_VALUE (pair) = DECL_INITIAL (enu);
5366 TYPE_VALUES (enumtype) = values;
5369 /* Fix up all variant types of this enum type. */
5370 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5372 if (tem == enumtype)
5374 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5375 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5376 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5377 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5378 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5379 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5380 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5381 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5382 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5383 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5386 /* Finish debugging output for this type. */
5387 rest_of_type_compilation (enumtype, toplevel);
5392 /* Build and install a CONST_DECL for one value of the
5393 current enumeration type (one that was begun with start_enum).
5394 Return a tree-list containing the CONST_DECL and its value.
5395 Assignment of sequential values by default is handled here. */
5398 build_enumerator (tree name, tree value)
5402 /* Validate and default VALUE. */
5404 /* Remove no-op casts from the value. */
5406 STRIP_TYPE_NOPS (value);
5410 if (TREE_CODE (value) == INTEGER_CST)
5412 value = default_conversion (value);
5413 constant_expression_warning (value);
5417 error ("enumerator value for `%s' not integer constant",
5418 IDENTIFIER_POINTER (name));
5423 /* Default based on previous value. */
5424 /* It should no longer be possible to have NON_LVALUE_EXPR
5428 value = enum_next_value;
5430 error ("overflow in enumeration values");
5433 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5435 pedwarn ("ISO C restricts enumerator values to range of `int'");
5436 value = convert (integer_type_node, value);
5439 /* Set basis for default for next value. */
5440 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5441 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5443 /* Now create a declaration for the enum value name. */
5445 type = TREE_TYPE (value);
5446 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5447 TYPE_PRECISION (integer_type_node)),
5448 (TYPE_PRECISION (type)
5449 >= TYPE_PRECISION (integer_type_node)
5450 && TREE_UNSIGNED (type)));
5452 decl = build_decl (CONST_DECL, name, type);
5453 DECL_INITIAL (decl) = convert (type, value);
5456 return tree_cons (decl, value, NULL_TREE);
5460 /* Create the FUNCTION_DECL for a function definition.
5461 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5462 the declaration; they describe the function's name and the type it returns,
5463 but twisted together in a fashion that parallels the syntax of C.
5465 This function creates a binding context for the function body
5466 as well as setting up the FUNCTION_DECL in current_function_decl.
5468 Returns 1 on success. If the DECLARATOR is not suitable for a function
5469 (it defines a datum instead), we return 0, which tells
5470 yyparse to report a parse error. */
5473 start_function (tree declspecs, tree declarator, tree attributes)
5475 tree decl1, old_decl;
5477 int old_immediate_size_expand = immediate_size_expand;
5479 current_function_returns_value = 0; /* Assume, until we see it does. */
5480 current_function_returns_null = 0;
5481 current_function_returns_abnormally = 0;
5482 warn_about_return_type = 0;
5483 current_extern_inline = 0;
5484 c_in_iteration_stmt = 0;
5487 /* Don't expand any sizes in the return type of the function. */
5488 immediate_size_expand = 0;
5490 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, NULL);
5492 /* If the declarator is not suitable for a function definition,
5493 cause a syntax error. */
5496 immediate_size_expand = old_immediate_size_expand;
5500 decl_attributes (&decl1, attributes, 0);
5502 if (DECL_DECLARED_INLINE_P (decl1)
5503 && DECL_UNINLINABLE (decl1)
5504 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5505 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5507 announce_function (decl1);
5509 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5511 error ("return type is an incomplete type");
5512 /* Make it return void instead. */
5514 = build_function_type (void_type_node,
5515 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5518 if (warn_about_return_type)
5519 pedwarn_c99 ("return type defaults to `int'");
5521 /* Save the parm names or decls from this function's declarator
5522 where store_parm_decls will find them. */
5523 current_function_parms = last_function_parms;
5524 current_function_parm_tags = last_function_parm_tags;
5525 current_function_parm_others = last_function_parm_others;
5527 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5528 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5529 DECL_INITIAL (decl1) = error_mark_node;
5531 /* If this definition isn't a prototype and we had a prototype declaration
5532 before, copy the arg type info from that prototype.
5533 But not if what we had before was a builtin function. */
5534 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5535 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5536 && !DECL_BUILT_IN (old_decl)
5537 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5538 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5539 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5541 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5542 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5545 /* Optionally warn of old-fashioned def with no previous prototype. */
5546 if (warn_strict_prototypes
5547 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5548 && C_DECL_ISNT_PROTOTYPE (old_decl))
5549 warning ("function declaration isn't a prototype");
5550 /* Optionally warn of any global def with no previous prototype. */
5551 else if (warn_missing_prototypes
5552 && TREE_PUBLIC (decl1)
5553 && ! MAIN_NAME_P (DECL_NAME (decl1))
5554 && C_DECL_ISNT_PROTOTYPE (old_decl))
5555 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5556 /* Optionally warn of any def with no previous prototype
5557 if the function has already been used. */
5558 else if (warn_missing_prototypes
5559 && old_decl != 0 && TREE_USED (old_decl)
5560 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5561 warning ("%J'%D' was used with no prototype before its definition",
5563 /* Optionally warn of any global def with no previous declaration. */
5564 else if (warn_missing_declarations
5565 && TREE_PUBLIC (decl1)
5567 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5568 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5569 /* Optionally warn of any def with no previous declaration
5570 if the function has already been used. */
5571 else if (warn_missing_declarations
5572 && old_decl != 0 && TREE_USED (old_decl)
5573 && C_DECL_IMPLICIT (old_decl))
5574 warning ("%J`%D' was used with no declaration before its definition",
5577 /* This is a definition, not a reference.
5578 So normally clear DECL_EXTERNAL.
5579 However, `extern inline' acts like a declaration
5580 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5581 DECL_EXTERNAL (decl1) = current_extern_inline;
5583 /* This function exists in static storage.
5584 (This does not mean `static' in the C sense!) */
5585 TREE_STATIC (decl1) = 1;
5587 /* A nested function is not global. */
5588 if (current_function_decl != 0)
5589 TREE_PUBLIC (decl1) = 0;
5591 #ifdef ENABLE_CHECKING
5592 /* This is the earliest point at which we might know the assembler
5593 name of the function. Thus, if it's set before this, die horribly. */
5594 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5598 /* If #pragma weak was used, mark the decl weak now. */
5599 if (current_scope == global_scope)
5600 maybe_apply_pragma_weak (decl1);
5602 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5603 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5608 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5609 != integer_type_node)
5610 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5612 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5613 args = TREE_CHAIN (args))
5615 tree type = args ? TREE_VALUE (args) : 0;
5617 if (type == void_type_node)
5624 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5625 pedwarn ("%Jfirst argument of '%D' should be `int'",
5630 if (TREE_CODE (type) != POINTER_TYPE
5631 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5632 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5634 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5639 if (TREE_CODE (type) != POINTER_TYPE
5640 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5641 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5643 pedwarn ("%Jthird argument of '%D' should probably be "
5644 "'char **'", decl1, decl1);
5649 /* It is intentional that this message does not mention the third
5650 argument because it's only mentioned in an appendix of the
5652 if (argct > 0 && (argct < 2 || argct > 3))
5653 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5655 if (! TREE_PUBLIC (decl1))
5656 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5659 /* Record the decl so that the function name is defined.
5660 If we already have a decl for this name, and it is a FUNCTION_DECL,
5661 use the old decl. */
5663 current_function_decl = pushdecl (decl1);
5666 declare_parm_level ();
5668 make_decl_rtl (current_function_decl, NULL);
5670 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5671 /* Promote the value to int before returning it. */
5672 if (c_promoting_integer_type_p (restype))
5674 /* It retains unsignedness if not really getting wider. */
5675 if (TREE_UNSIGNED (restype)
5676 && (TYPE_PRECISION (restype)
5677 == TYPE_PRECISION (integer_type_node)))
5678 restype = unsigned_type_node;
5680 restype = integer_type_node;
5682 DECL_RESULT (current_function_decl)
5683 = build_decl (RESULT_DECL, NULL_TREE, restype);
5685 /* If this fcn was already referenced via a block-scope `extern' decl
5686 (or an implicit decl), propagate certain information about the usage. */
5687 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5688 TREE_ADDRESSABLE (current_function_decl) = 1;
5690 immediate_size_expand = old_immediate_size_expand;
5692 start_fname_decls ();
5697 /* Subroutine of store_parm_decls which handles new-style function
5698 definitions (prototype format). The parms already have decls, so we
5699 need only record them as in effect and complain if any redundant
5700 old-style parm decls were written. */
5702 store_parm_decls_newstyle (void)
5705 tree fndecl = current_function_decl;
5706 tree parms = current_function_parms;
5707 tree tags = current_function_parm_tags;
5708 tree others = current_function_parm_others;
5710 if (current_scope->parms || current_scope->names || current_scope->tags)
5712 error ("%Jold-style parameter declarations in prototyped "
5713 "function definition", fndecl);
5715 /* Get rid of the old-style declarations. */
5720 /* Now make all the parameter declarations visible in the function body.
5721 We can bypass most of the grunt work of pushdecl. */
5722 for (last = 0, decl = parms; decl; last = decl, decl = TREE_CHAIN (decl))
5724 DECL_CONTEXT (decl) = current_function_decl;
5725 if (DECL_NAME (decl) == 0)
5726 error ("%Jparameter name omitted", decl);
5729 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5730 current_scope->shadowed
5731 = tree_cons (DECL_NAME (decl),
5732 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5733 current_scope->shadowed);
5734 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5737 current_scope->parms = parms;
5738 current_scope->parms_last = last;
5740 /* Record the parameter list in the function declaration. */
5741 DECL_ARGUMENTS (fndecl) = parms;
5743 /* Now make all the ancillary declarations visible, likewise. */
5744 for (last = 0, decl = others; decl; last = decl, decl = TREE_CHAIN (decl))
5746 DECL_CONTEXT (decl) = current_function_decl;
5747 if (DECL_NAME (decl)
5748 && TYPE_MAIN_VARIANT (TREE_TYPE (decl)) != void_type_node)
5750 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5751 current_scope->shadowed
5752 = tree_cons (DECL_NAME (decl),
5753 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5754 current_scope->shadowed);
5755 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5758 current_scope->names = others;
5759 current_scope->names_last = last;
5761 /* And all the tag declarations. */
5762 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5763 if (TREE_PURPOSE (decl))
5765 if (IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)))
5766 current_scope->shadowed_tags
5767 = tree_cons (TREE_PURPOSE (decl),
5768 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (decl)),
5769 current_scope->shadowed_tags);
5770 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)) = TREE_VALUE (decl);
5772 current_scope->tags = tags;
5775 /* Subroutine of store_parm_decls which handles old-style function
5776 definitions (separate parameter list and declarations). */
5779 store_parm_decls_oldstyle (void)
5781 tree parm, decl, last;
5782 tree fndecl = current_function_decl;
5784 /* This is the identifier list from the function declarator. */
5785 tree parmids = current_function_parms;
5787 /* We use DECL_WEAK as a flag to show which parameters have been
5788 seen already, since it is not used on PARM_DECL. */
5789 #ifdef ENABLE_CHECKING
5790 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5791 if (DECL_WEAK (parm))
5795 /* Match each formal parameter name with its declaration. Save each
5796 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5797 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5799 if (TREE_VALUE (parm) == 0)
5801 error ("%Jparameter name missing from parameter list", fndecl);
5802 TREE_PURPOSE (parm) = 0;
5806 decl = IDENTIFIER_SYMBOL_VALUE (TREE_VALUE (parm));
5807 if (decl && DECL_CONTEXT (decl) == fndecl)
5809 /* If we got something other than a PARM_DECL it is an error. */
5810 if (TREE_CODE (decl) != PARM_DECL)
5811 error ("%J\"%D\" declared as a non-parameter", decl, decl);
5812 /* If the declaration is already marked, we have a duplicate
5813 name. Complain and ignore the duplicate. */
5814 else if (DECL_WEAK (decl))
5816 error ("%Jmultiple parameters named \"%D\"", decl, decl);
5817 TREE_PURPOSE (parm) = 0;
5820 /* If the declaration says "void", complain and turn it into
5822 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5824 error ("%Jparameter \"%D\" declared void", decl, decl);
5825 TREE_TYPE (decl) = integer_type_node;
5826 DECL_ARG_TYPE (decl) = integer_type_node;
5827 layout_decl (decl, 0);
5830 /* If no declaration found, default to int. */
5833 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5834 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5835 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5839 pedwarn ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5840 else if (extra_warnings)
5841 warning ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5844 TREE_PURPOSE (parm) = decl;
5845 DECL_WEAK (decl) = 1;
5848 /* Now examine the parms chain for incomplete declarations
5849 and declarations with no corresponding names. */
5851 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5853 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5855 error ("%Jparameter \"%D\" has incomplete type", parm, parm);
5856 TREE_TYPE (parm) = error_mark_node;
5859 if (! DECL_WEAK (parm))
5861 error ("%Jdeclaration for parameter \"%D\" but no such parameter",
5864 /* Pretend the parameter was not missing.
5865 This gets us to a standard state and minimizes
5866 further error messages. */
5867 parmids = chainon (parmids, tree_cons (parm, 0, 0));
5871 /* Chain the declarations together in the order of the list of
5872 names. Store that chain in the function decl, replacing the
5873 list of names. Update the current scope to match. */
5874 DECL_ARGUMENTS (fndecl) = 0;
5876 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5877 if (TREE_PURPOSE (parm))
5879 if (parm && TREE_PURPOSE (parm))
5881 last = TREE_PURPOSE (parm);
5882 DECL_ARGUMENTS (fndecl) = last;
5883 current_scope->parms = last;
5884 DECL_WEAK (last) = 0;
5886 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
5887 if (TREE_PURPOSE (parm))
5889 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5890 last = TREE_PURPOSE (parm);
5891 DECL_WEAK (last) = 0;
5893 current_scope->parms_last = last;
5894 TREE_CHAIN (last) = 0;
5897 /* If there was a previous prototype,
5898 set the DECL_ARG_TYPE of each argument according to
5899 the type previously specified, and report any mismatches. */
5901 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5904 for (parm = DECL_ARGUMENTS (fndecl),
5905 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5906 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5907 != void_type_node));
5908 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5910 if (parm == 0 || type == 0
5911 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5913 error ("number of arguments doesn't match prototype");
5914 error ("%Hprototype declaration",
5915 ¤t_function_prototype_locus);
5918 /* Type for passing arg must be consistent with that
5919 declared for the arg. ISO C says we take the unqualified
5920 type for parameters declared with qualified type. */
5921 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5922 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
5925 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5926 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5928 /* Adjust argument to match prototype. E.g. a previous
5929 `int foo(float);' prototype causes
5930 `int foo(x) float x; {...}' to be treated like
5931 `int foo(float x) {...}'. This is particularly
5932 useful for argument types like uid_t. */
5933 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5935 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
5936 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5937 && TYPE_PRECISION (TREE_TYPE (parm))
5938 < TYPE_PRECISION (integer_type_node))
5939 DECL_ARG_TYPE (parm) = integer_type_node;
5943 pedwarn ("promoted argument \"%D\" "
5944 "doesn't match prototype", parm);
5945 pedwarn ("%Hprototype declaration",
5946 ¤t_function_prototype_locus);
5951 error ("argument \"%D\" doesn't match prototype", parm);
5952 error ("%Hprototype declaration",
5953 ¤t_function_prototype_locus);
5957 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5960 /* Otherwise, create a prototype that would match. */
5964 tree actual = 0, last = 0, type;
5966 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5968 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
5970 TREE_CHAIN (last) = type;
5975 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5977 TREE_CHAIN (last) = type;
5981 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5982 of the type of this function, but we need to avoid having this
5983 affect the types of other similarly-typed functions, so we must
5984 first force the generation of an identical (but separate) type
5985 node for the relevant function type. The new node we create
5986 will be a variant of the main variant of the original function
5989 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5991 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5995 /* Store the parameter declarations into the current function declaration.
5996 This is called after parsing the parameter declarations, before
5997 digesting the body of the function.
5999 For an old-style definition, construct a prototype out of the old-style
6000 parameter declarations and inject it into the function's type. */
6003 store_parm_decls (void)
6005 tree fndecl = current_function_decl;
6007 /* True if this definition is written with a prototype. */
6008 bool prototype = (current_function_parms
6009 && TREE_CODE (current_function_parms) != TREE_LIST);
6012 store_parm_decls_newstyle ();
6014 store_parm_decls_oldstyle ();
6016 /* The next call to pushlevel will be a function body. */
6018 next_is_function_body = true;
6020 /* Write a record describing this function definition to the prototypes
6021 file (if requested). */
6023 gen_aux_info_record (fndecl, 1, 0, prototype);
6025 /* Initialize the RTL code for the function. */
6026 allocate_struct_function (fndecl);
6028 /* Begin the statement tree for this function. */
6029 begin_stmt_tree (&DECL_SAVED_TREE (fndecl));
6031 /* Save away the sizes of any variable-size types so that we can
6032 expand them when generating RTL. */
6033 DECL_LANG_SPECIFIC (fndecl)->pending_sizes = get_pending_sizes ();
6035 /* This function is being processed in whole-function mode. */
6036 cfun->x_whole_function_mode_p = 1;
6038 /* Even though we're inside a function body, we still don't want to
6039 call expand_expr to calculate the size of a variable-sized array.
6040 We haven't necessarily assigned RTL to all variables yet, so it's
6041 not safe to try to expand expressions involving them. */
6042 immediate_size_expand = 0;
6043 cfun->x_dont_save_pending_sizes_p = 1;
6046 /* Finish up a function declaration and compile that function
6047 all the way to assembler language output. The free the storage
6048 for the function definition.
6050 This is called after parsing the body of the function definition. */
6053 finish_function (void)
6055 tree fndecl = current_function_decl;
6057 /* When a function declaration is totally empty, e.g.
6059 (the argument list is irrelevant) the compstmt rule will not
6060 bother calling pushlevel/poplevel, which means we get here with
6061 the scope stack out of sync. Detect this situation by noticing
6062 that current_scope is still as store_parm_decls left it, and do
6063 a dummy push/pop to get back to consistency.
6064 Note that the call to pushlevel does not actually push another
6065 scope - see there for details. */
6067 if (current_scope->parm_flag && next_is_function_body)
6073 if (TREE_CODE (fndecl) == FUNCTION_DECL
6074 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6076 tree args = DECL_ARGUMENTS (fndecl);
6077 for (; args; args = TREE_CHAIN (args))
6079 tree type = TREE_TYPE (args);
6080 if (INTEGRAL_TYPE_P (type)
6081 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6082 DECL_ARG_TYPE (args) = integer_type_node;
6086 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6087 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6089 /* Must mark the RESULT_DECL as being in this function. */
6091 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6092 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6094 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6096 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6097 != integer_type_node)
6099 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6100 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6102 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6106 #ifdef DEFAULT_MAIN_RETURN
6107 /* Make it so that `main' always returns success by default. */
6108 DEFAULT_MAIN_RETURN;
6111 c_expand_return (integer_zero_node);
6116 finish_fname_decls ();
6118 /* Tie off the statement tree for this function. */
6119 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6121 /* Complain if there's just no return statement. */
6122 if (warn_return_type
6123 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6124 && !current_function_returns_value && !current_function_returns_null
6125 /* Don't complain if we abort. */
6126 && !current_function_returns_abnormally
6127 /* Don't warn for main(). */
6128 && !MAIN_NAME_P (DECL_NAME (fndecl))
6129 /* Or if they didn't actually specify a return type. */
6130 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6131 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6132 inline function, as we might never be compiled separately. */
6133 && DECL_INLINE (fndecl))
6134 warning ("no return statement in function returning non-void");
6136 /* With just -Wextra, complain only if function returns both with
6137 and without a value. */
6139 && current_function_returns_value
6140 && current_function_returns_null)
6141 warning ("this function may return with or without a value");
6143 /* We're leaving the context of this function, so zap cfun. It's still in
6144 DECL_SAVED_INSNS, and we'll restore it in tree_rest_of_compilation. */
6147 /* ??? Objc emits functions after finalizing the compilation unit.
6148 This should be cleaned up later and this conditional removed. */
6149 if (!cgraph_global_info_ready)
6150 cgraph_finalize_function (fndecl, false);
6152 c_expand_body (fndecl);
6153 current_function_decl = NULL;
6156 /* Generate the RTL for a deferred function FNDECL. */
6159 c_expand_deferred_function (tree fndecl)
6161 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6162 function was deferred, e.g. in duplicate_decls. */
6163 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6165 if (flag_inline_trees)
6167 timevar_push (TV_INTEGRATION);
6168 optimize_inline_calls (fndecl);
6169 timevar_pop (TV_INTEGRATION);
6171 c_expand_body (fndecl);
6172 current_function_decl = NULL;
6176 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6177 then we are already in the process of generating RTL for another
6181 c_expand_body_1 (tree fndecl, int nested_p)
6184 /* Squirrel away our current state. */
6185 push_function_context ();
6187 /* Make sure that we will evaluate variable-sized types involved
6188 in our function's type. */
6189 put_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6190 tree_rest_of_compilation (fndecl, nested_p);
6193 /* Return to the enclosing function. */
6194 pop_function_context ();
6196 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6198 if (targetm.have_ctors_dtors)
6199 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6200 DEFAULT_INIT_PRIORITY);
6202 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6205 if (DECL_STATIC_DESTRUCTOR (fndecl))
6207 if (targetm.have_ctors_dtors)
6208 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6209 DEFAULT_INIT_PRIORITY);
6211 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6215 /* Like c_expand_body_1 but only for unnested functions. */
6218 c_expand_body (tree fndecl)
6221 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6222 c_expand_body_1 (fndecl, 0);
6225 /* Check the declarations given in a for-loop for satisfying the C99
6228 check_for_loop_decls (void)
6234 /* If we get here, declarations have been used in a for loop without
6235 the C99 for loop scope. This doesn't make much sense, so don't
6237 error ("'for' loop initial declaration used outside C99 mode");
6240 /* C99 subclause 6.8.5 paragraph 3:
6242 [#3] The declaration part of a for statement shall only
6243 declare identifiers for objects having storage class auto or
6246 It isn't clear whether, in this sentence, "identifiers" binds to
6247 "shall only declare" or to "objects" - that is, whether all identifiers
6248 declared must be identifiers for objects, or whether the restriction
6249 only applies to those that are. (A question on this in comp.std.c
6250 in November 2000 received no answer.) We implement the strictest
6251 interpretation, to avoid creating an extension which later causes
6254 for (t = current_scope->tags; t; t = TREE_CHAIN (t))
6256 if (TREE_PURPOSE (t) != 0)
6258 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6260 if (code == RECORD_TYPE)
6261 error ("'struct %s' declared in 'for' loop initial declaration",
6262 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6263 else if (code == UNION_TYPE)
6264 error ("'union %s' declared in 'for' loop initial declaration",
6265 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6267 error ("'enum %s' declared in 'for' loop initial declaration",
6268 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6272 for (t = getdecls (); t; t = TREE_CHAIN (t))
6274 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6275 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6276 "initial declaration", t, t);
6277 else if (TREE_STATIC (t))
6278 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6279 "initial declaration", t, t);
6280 else if (DECL_EXTERNAL (t))
6281 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6282 "initial declaration", t, t);
6286 /* Save and reinitialize the variables
6287 used during compilation of a C function. */
6290 c_push_function_context (struct function *f)
6292 struct language_function *p;
6293 p = ggc_alloc (sizeof (struct language_function));
6296 p->base.x_stmt_tree = c_stmt_tree;
6297 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6298 p->x_in_iteration_stmt = c_in_iteration_stmt;
6299 p->x_in_case_stmt = c_in_case_stmt;
6300 p->returns_value = current_function_returns_value;
6301 p->returns_null = current_function_returns_null;
6302 p->returns_abnormally = current_function_returns_abnormally;
6303 p->warn_about_return_type = warn_about_return_type;
6304 p->extern_inline = current_extern_inline;
6307 /* Restore the variables used during compilation of a C function. */
6310 c_pop_function_context (struct function *f)
6312 struct language_function *p = f->language;
6314 if (DECL_SAVED_INSNS (current_function_decl) == 0
6315 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6317 /* Stop pointing to the local nodes about to be freed. */
6318 /* But DECL_INITIAL must remain nonzero so we know this
6319 was an actual function definition. */
6320 DECL_INITIAL (current_function_decl) = error_mark_node;
6321 DECL_ARGUMENTS (current_function_decl) = 0;
6324 c_stmt_tree = p->base.x_stmt_tree;
6325 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6326 c_in_iteration_stmt = p->x_in_iteration_stmt;
6327 c_in_case_stmt = p->x_in_case_stmt;
6328 current_function_returns_value = p->returns_value;
6329 current_function_returns_null = p->returns_null;
6330 current_function_returns_abnormally = p->returns_abnormally;
6331 warn_about_return_type = p->warn_about_return_type;
6332 current_extern_inline = p->extern_inline;
6337 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6340 c_dup_lang_specific_decl (tree decl)
6342 struct lang_decl *ld;
6344 if (!DECL_LANG_SPECIFIC (decl))
6347 ld = ggc_alloc (sizeof (struct lang_decl));
6348 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6349 DECL_LANG_SPECIFIC (decl) = ld;
6352 /* The functions below are required for functionality of doing
6353 function at once processing in the C front end. Currently these
6354 functions are not called from anywhere in the C front end, but as
6355 these changes continue, that will change. */
6357 /* Returns nonzero if the current statement is a full expression,
6358 i.e. temporaries created during that statement should be destroyed
6359 at the end of the statement. */
6362 stmts_are_full_exprs_p (void)
6367 /* Returns the stmt_tree (if any) to which statements are currently
6368 being added. If there is no active statement-tree, NULL is
6372 current_stmt_tree (void)
6374 return &c_stmt_tree;
6377 /* Returns the stack of SCOPE_STMTs for the current function. */
6380 current_scope_stmt_stack (void)
6382 return &c_scope_stmt_stack;
6385 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6389 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6394 /* Dummy function in place of callback used by C++. */
6397 extract_interface_info (void)
6401 /* Return a new COMPOUND_STMT, after adding it to the current
6405 c_begin_compound_stmt (void)
6409 /* Create the COMPOUND_STMT. */
6410 stmt = add_stmt (build_stmt (COMPOUND_STMT, error_mark_node));
6415 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6419 c_expand_decl_stmt (tree t)
6421 tree decl = DECL_STMT_DECL (t);
6423 /* Expand nested functions. */
6424 if (TREE_CODE (decl) == FUNCTION_DECL
6425 && DECL_CONTEXT (decl) == current_function_decl
6426 && DECL_SAVED_TREE (decl))
6427 c_expand_body_1 (decl, 1);
6430 /* Return the global value of T as a symbol. */
6433 identifier_global_value (tree t)
6435 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6436 if (decl == 0 || DECL_FILE_SCOPE_P (decl))
6439 /* Shadowed by something else; find the true global value. */
6440 for (decl = global_scope->names; decl; decl = TREE_CHAIN (decl))
6441 if (DECL_NAME (decl) == t)
6444 /* Only local values for this decl. */
6448 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6449 otherwise the name is found in ridpointers from RID_INDEX. */
6452 record_builtin_type (enum rid rid_index, const char *name, tree type)
6456 id = ridpointers[(int) rid_index];
6458 id = get_identifier (name);
6459 pushdecl (build_decl (TYPE_DECL, id, type));
6462 /* Build the void_list_node (void_type_node having been created). */
6464 build_void_list_node (void)
6466 tree t = build_tree_list (NULL_TREE, void_type_node);
6470 /* Return something to represent absolute declarators containing a *.
6471 TARGET is the absolute declarator that the * contains.
6472 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6473 to apply to the pointer type, represented as identifiers, possible mixed
6476 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6477 if attributes are present) and whose type is the modifier list. */
6480 make_pointer_declarator (tree type_quals_attrs, tree target)
6483 tree itarget = target;
6484 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6485 if (attrs != NULL_TREE)
6486 itarget = tree_cons (attrs, target, NULL_TREE);
6487 return build1 (INDIRECT_REF, quals, itarget);
6490 /* A wrapper around lhd_set_decl_assembler_name that gives static
6491 variables their C names if they are at file scope and only one
6492 translation unit is being compiled, for backwards compatibility
6493 with certain bizarre assembler hacks (like crtstuff.c). */
6496 c_static_assembler_name (tree decl)
6498 if (num_in_fnames == 1
6499 && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6500 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6501 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6503 lhd_set_decl_assembler_name (decl);
6506 /* Hash and equality functions for link_hash_table: key off
6507 DECL_ASSEMBLER_NAME. */
6510 link_hash_hash (const void *x_p)
6513 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6517 link_hash_eq (const void *x1_p, const void *x2_p)
6519 tree x1 = (tree)x1_p;
6520 tree x2 = (tree)x2_p;
6521 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6524 /* Propagate information between definitions and uses between multiple
6525 translation units in TU_LIST based on linkage rules. */
6528 merge_translation_unit_decls (void)
6530 const tree tu_list = current_file_decl;
6533 htab_t link_hash_table;
6536 /* Create the BLOCK that poplevel would have created, but don't
6537 actually call poplevel since that's expensive. */
6538 block = make_node (BLOCK);
6539 BLOCK_VARS (block) = current_scope->names;
6540 TREE_USED (block) = 1;
6541 DECL_INITIAL (current_file_decl) = block;
6543 /* If only one translation unit seen, no copying necessary. */
6544 if (TREE_CHAIN (tu_list) == NULL_TREE)
6547 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6549 /* Enter any actual definitions into the hash table. */
6550 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6551 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6552 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6555 slot = htab_find_slot (link_hash_table, decl, INSERT);
6557 /* If we've already got a definition, work out which one is
6558 the real one, put it into the hash table, and make the
6559 other one DECL_EXTERNAL. This is important to avoid
6560 putting out two definitions of the same symbol in the
6564 tree old_decl = (tree) *slot;
6566 /* If this is weak or common or whatever, suppress it
6567 in favor of the other definition. */
6568 if (DECL_WEAK (decl))
6569 DECL_EXTERNAL (decl) = 1;
6570 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6571 DECL_EXTERNAL (old_decl) = 1;
6572 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6573 DECL_EXTERNAL (decl) = 1;
6574 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6575 DECL_EXTERNAL (old_decl) = 1;
6577 if (DECL_EXTERNAL (decl))
6579 DECL_INITIAL (decl) = NULL_TREE;
6580 DECL_COMMON (decl) = 0;
6581 DECL_ONE_ONLY (decl) = 0;
6582 DECL_WEAK (decl) = 0;
6584 else if (DECL_EXTERNAL (old_decl))
6586 DECL_INITIAL (old_decl) = NULL_TREE;
6587 DECL_COMMON (old_decl) = 0;
6588 DECL_ONE_ONLY (old_decl) = 0;
6589 DECL_WEAK (old_decl) = 0;
6594 error ("%Jredefinition of global '%D'", decl, decl);
6595 error ("%J'%D' previously defined here", old_decl, old_decl);
6602 /* Now insert the desired information from all the definitions
6603 into any plain declarations. */
6604 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6605 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6606 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6609 global_decl = htab_find (link_hash_table, decl);
6614 /* Print any appropriate error messages, and partially merge
6616 (void) duplicate_decls (decl, global_decl);
6619 htab_delete (link_hash_table);
6622 /* Perform final processing on file-scope data. */
6625 c_write_global_declarations(void)
6629 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6631 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6632 int len = list_length (globals);
6633 tree *vec = xmalloc (sizeof (tree) * len);
6637 /* Process the decls in the order they were written. */
6639 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6642 wrapup_global_declarations (vec, len);
6644 check_global_declarations (vec, len);
6651 /* Reset the parser's state in preparation for a new file. */
6654 c_reset_state (void)
6657 tree file_scope_decl;
6659 /* Pop the global scope. */
6660 if (current_scope != global_scope)
6661 current_scope = global_scope;
6662 file_scope_decl = current_file_decl;
6663 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6664 BLOCK_SUPERCONTEXT (DECL_INITIAL (file_scope_decl)) = file_scope_decl;
6665 truly_local_externals = NULL_TREE;
6667 /* Start a new global binding level. */
6669 global_scope = current_scope;
6670 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6671 TREE_CHAIN (current_file_decl) = file_scope_decl;
6673 /* Reintroduce the builtin declarations. */
6674 for (link = first_builtin_decl;
6675 link != TREE_CHAIN (last_builtin_decl);
6676 link = TREE_CHAIN (link))
6677 pushdecl (copy_node (link));
6680 #include "gt-c-decl.h"