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)))
1276 warning ("%Jredundant redeclaration of '%D'", newdecl, newdecl);
1280 /* Report location of previous decl/defn in a consistent manner. */
1281 if (warned || pedwarned)
1282 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1287 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1288 consistent with OLDDECL, but carries new information. Merge the
1289 new information into OLDDECL. This function issues no
1293 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1295 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1296 && DECL_INITIAL (newdecl) != 0);
1298 /* For real parm decl following a forward decl, return 1 so old decl
1299 will be reused. Only allow this to happen once. */
1300 if (TREE_CODE (newdecl) == PARM_DECL
1301 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1303 TREE_ASM_WRITTEN (olddecl) = 0;
1307 DECL_ATTRIBUTES (newdecl)
1308 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1310 /* Merge the data types specified in the two decls. */
1312 = TREE_TYPE (olddecl)
1313 = common_type (newtype, oldtype);
1315 /* Lay the type out, unless already done. */
1316 if (oldtype != TREE_TYPE (newdecl))
1318 if (TREE_TYPE (newdecl) != error_mark_node)
1319 layout_type (TREE_TYPE (newdecl));
1320 if (TREE_CODE (newdecl) != FUNCTION_DECL
1321 && TREE_CODE (newdecl) != TYPE_DECL
1322 && TREE_CODE (newdecl) != CONST_DECL)
1323 layout_decl (newdecl, 0);
1327 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1328 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1329 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1330 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1331 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1332 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1334 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1335 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1339 /* Keep the old rtl since we can safely use it. */
1340 COPY_DECL_RTL (olddecl, newdecl);
1342 /* Merge the type qualifiers. */
1343 if (TREE_READONLY (newdecl))
1344 TREE_READONLY (olddecl) = 1;
1346 if (TREE_THIS_VOLATILE (newdecl))
1348 TREE_THIS_VOLATILE (olddecl) = 1;
1349 if (TREE_CODE (newdecl) == VAR_DECL)
1350 make_var_volatile (newdecl);
1353 /* Keep source location of definition rather than declaration. */
1354 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1355 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1357 /* Merge the unused-warning information. */
1358 if (DECL_IN_SYSTEM_HEADER (olddecl))
1359 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1360 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1361 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1363 /* Merge the initialization information. */
1364 if (DECL_INITIAL (newdecl) == 0)
1365 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1367 /* Merge the section attribute.
1368 We want to issue an error if the sections conflict but that must be
1369 done later in decl_attributes since we are called before attributes
1371 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1372 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1374 /* Copy the assembler name.
1375 Currently, it can only be defined in the prototype. */
1376 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1378 /* If either declaration has a nondefault visibility, use it. */
1379 if (DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT)
1380 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1382 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1384 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1385 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1386 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1387 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1388 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1389 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1390 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1391 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1392 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1395 /* Merge the storage class information. */
1396 merge_weak (newdecl, olddecl);
1398 /* For functions, static overrides non-static. */
1399 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1401 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1402 /* This is since we don't automatically
1403 copy the attributes of NEWDECL into OLDDECL. */
1404 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1405 /* If this clears `static', clear it in the identifier too. */
1406 if (! TREE_PUBLIC (olddecl))
1407 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1409 if (DECL_EXTERNAL (newdecl))
1411 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1412 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1414 /* An extern decl does not override previous storage class. */
1415 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1416 if (! DECL_EXTERNAL (newdecl))
1418 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1419 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1424 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1425 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1428 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1430 /* If we're redefining a function previously defined as extern
1431 inline, make sure we emit debug info for the inline before we
1432 throw it away, in case it was inlined into a function that hasn't
1433 been written out yet. */
1434 if (new_is_definition && DECL_INITIAL (olddecl))
1436 if (TREE_USED (olddecl)
1437 /* In unit-at-a-time mode we never inline re-defined extern
1438 inline functions. */
1439 && !flag_unit_at_a_time
1440 && cgraph_function_possibly_inlined_p (olddecl))
1441 (*debug_hooks->outlining_inline_function) (olddecl);
1443 /* The new defn must not be inline. */
1444 DECL_INLINE (newdecl) = 0;
1445 DECL_UNINLINABLE (newdecl) = 1;
1449 /* If either decl says `inline', this fn is inline,
1450 unless its definition was passed already. */
1451 if (DECL_DECLARED_INLINE_P (newdecl)
1452 || DECL_DECLARED_INLINE_P (olddecl))
1453 DECL_DECLARED_INLINE_P (newdecl) = 1;
1455 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1456 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1459 if (DECL_BUILT_IN (olddecl))
1461 /* If redeclaring a builtin function, it stays built in. */
1462 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1463 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1466 /* Also preserve various other info from the definition. */
1467 if (! new_is_definition)
1469 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1470 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1471 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1472 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1473 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1475 /* Set DECL_INLINE on the declaration if we've got a body
1476 from which to instantiate. */
1477 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1479 DECL_INLINE (newdecl) = 1;
1480 DECL_ABSTRACT_ORIGIN (newdecl)
1481 = DECL_ABSTRACT_ORIGIN (olddecl);
1486 /* If a previous declaration said inline, mark the
1487 definition as inlinable. */
1488 if (DECL_DECLARED_INLINE_P (newdecl)
1489 && ! DECL_UNINLINABLE (newdecl))
1490 DECL_INLINE (newdecl) = 1;
1494 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1495 But preserve OLDDECL's DECL_UID and C_DECL_INVISIBLE. */
1497 unsigned olddecl_uid = DECL_UID (olddecl);
1498 unsigned olddecl_invisible = C_DECL_INVISIBLE (olddecl);
1500 memcpy ((char *) olddecl + sizeof (struct tree_common),
1501 (char *) newdecl + sizeof (struct tree_common),
1502 sizeof (struct tree_decl) - sizeof (struct tree_common));
1503 DECL_UID (olddecl) = olddecl_uid;
1504 C_DECL_INVISIBLE (olddecl) = olddecl_invisible;
1507 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1508 so that encode_section_info has a chance to look at the new decl
1509 flags and attributes. */
1510 if (DECL_RTL_SET_P (olddecl)
1511 && (TREE_CODE (olddecl) == FUNCTION_DECL
1512 || (TREE_CODE (olddecl) == VAR_DECL
1513 && TREE_STATIC (olddecl))))
1514 make_decl_rtl (olddecl, NULL);
1517 /* Handle when a new declaration NEWDECL has the same name as an old
1518 one OLDDECL in the same binding contour. Prints an error message
1521 If safely possible, alter OLDDECL to look like NEWDECL, and return
1522 true. Otherwise, return false. */
1525 duplicate_decls (tree newdecl, tree olddecl)
1527 tree newtype, oldtype;
1529 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1532 merge_decls (newdecl, olddecl, newtype, oldtype);
1537 /* Return any external DECL associated with ID, whether or not it is
1538 currently in scope. */
1541 any_external_decl (tree id)
1543 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1546 if (decl == 0 || TREE_CODE (decl) == ERROR_MARK)
1548 else if (TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1551 t = purpose_member (id, truly_local_externals);
1553 return TREE_VALUE (t);
1558 /* Record an external decl DECL. This only does something if a
1559 shadowing decl already exists. */
1561 record_external_decl (tree decl)
1563 tree name = DECL_NAME (decl);
1564 if (!IDENTIFIER_SYMBOL_VALUE (name))
1567 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1570 /* Check whether decl-node X shadows an existing declaration.
1571 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1572 which might be a NULL_TREE. */
1574 warn_if_shadowing (tree x, tree old)
1576 /* Nothing to shadow? */
1578 /* Shadow warnings not wanted? */
1580 /* No shadow warnings for internally generated vars. */
1581 || DECL_SOURCE_LINE (x) == 0
1582 /* No shadow warnings for vars made for inlining. */
1583 || DECL_FROM_INLINE (x)
1584 /* Don't warn about the parm names in function declarator
1585 within a function declarator.
1586 It would be nice to avoid warning in any function
1587 declarator in a declaration, as opposed to a definition,
1588 but there is no way to tell it's not a definition. */
1589 || (TREE_CODE (x) == PARM_DECL && current_scope->outer->parm_flag)
1590 /* Shadow warnings only apply to local variables and parameters. */
1591 || (TREE_CODE (x) != PARM_DECL && DECL_FILE_SCOPE_P (x)))
1594 if (TREE_CODE (old) == PARM_DECL)
1595 warning ("%Jdeclaration of '%D' shadows a parameter", x, x);
1596 else if (DECL_FILE_SCOPE_P (old))
1597 warning ("%Jdeclaration of '%D' shadows a global declaration", x, x);
1599 warning ("%Jdeclaration of '%D' shadows a previous local", x, x);
1601 warning ("%Jshadowed declaration is here", old);
1605 /* Subroutine of pushdecl.
1607 X is a TYPE_DECL for a typedef statement. Create a brand new
1608 ..._TYPE node (which will be just a variant of the existing
1609 ..._TYPE node with identical properties) and then install X
1610 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1612 The whole point here is to end up with a situation where each
1613 and every ..._TYPE node the compiler creates will be uniquely
1614 associated with AT MOST one node representing a typedef name.
1615 This way, even though the compiler substitutes corresponding
1616 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1617 early on, later parts of the compiler can always do the reverse
1618 translation and get back the corresponding typedef name. For
1621 typedef struct S MY_TYPE;
1624 Later parts of the compiler might only know that `object' was of
1625 type `struct S' if it were not for code just below. With this
1626 code however, later parts of the compiler see something like:
1628 struct S' == struct S
1629 typedef struct S' MY_TYPE;
1632 And they can then deduce (from the node for type struct S') that
1633 the original object declaration was:
1637 Being able to do this is important for proper support of protoize,
1638 and also for generating precise symbolic debugging information
1639 which takes full account of the programmer's (typedef) vocabulary.
1641 Obviously, we don't want to generate a duplicate ..._TYPE node if
1642 the TYPE_DECL node that we are now processing really represents a
1643 standard built-in type.
1645 Since all standard types are effectively declared at line zero
1646 in the source file, we can easily check to see if we are working
1647 on a standard type by checking the current value of lineno. */
1650 clone_underlying_type (tree x)
1652 if (DECL_SOURCE_LINE (x) == 0)
1654 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1655 TYPE_NAME (TREE_TYPE (x)) = x;
1657 else if (TREE_TYPE (x) != error_mark_node
1658 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1660 tree tt = TREE_TYPE (x);
1661 DECL_ORIGINAL_TYPE (x) = tt;
1662 tt = build_type_copy (tt);
1664 TREE_USED (tt) = TREE_USED (x);
1669 /* Record a decl-node X as belonging to the current lexical scope.
1670 Check for errors (such as an incompatible declaration for the same
1671 name already seen in the same scope).
1673 Returns either X or an old decl for the same name.
1674 If an old decl is returned, it may have been smashed
1675 to agree with what X says. */
1680 tree name = DECL_NAME (x);
1681 struct c_scope *scope = current_scope;
1683 #ifdef ENABLE_CHECKING
1684 if (error_mark_node == 0)
1685 /* Called too early. */
1689 /* Functions need the lang_decl data. */
1690 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1691 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1693 /* A local extern declaration for a function doesn't constitute nesting.
1694 A local auto declaration does, since it's a forward decl
1695 for a nested function coming later. */
1696 if (current_function_decl == NULL
1697 || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1698 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
1699 DECL_CONTEXT (x) = current_file_decl;
1701 DECL_CONTEXT (x) = current_function_decl;
1707 if (warn_nested_externs
1708 && scope != global_scope
1709 && DECL_EXTERNAL (x)
1710 && !DECL_IN_SYSTEM_HEADER (x))
1711 warning ("nested extern declaration of `%s'",
1712 IDENTIFIER_POINTER (name));
1714 old = lookup_name_current_level (name);
1715 if (old && duplicate_decls (x, old))
1717 /* For PARM_DECLs, old may be a forward declaration.
1718 If so, we want to remove it from its old location
1719 (in the variables chain) and rechain it in the
1720 location given by the new declaration. */
1721 if (TREE_CODE (x) == PARM_DECL)
1724 for (p = &scope->names; *p; p = &TREE_CHAIN (*p))
1727 *p = TREE_CHAIN (old);
1728 SCOPE_LIST_APPEND (scope, parms, old);
1734 if (DECL_EXTERNAL (x) || scope == global_scope)
1736 /* Find and check against a previous, not-in-scope, external
1737 decl for this identifier. (C99 6.2.7p2: All declarations
1738 that refer to the same object or function shall have
1739 compatible type; otherwise, the behavior is undefined.) */
1740 tree ext = any_external_decl (name);
1743 if (duplicate_decls (x, ext))
1744 x = copy_node (ext);
1747 record_external_decl (x);
1750 if (TREE_CODE (x) == TYPE_DECL)
1751 clone_underlying_type (x);
1753 /* If storing a local value, there may already be one
1754 (inherited). If so, record it for restoration when this
1755 scope ends. Take care not to do this if we are replacing an
1756 older decl in the same scope (i.e. duplicate_decls returned
1758 if (scope != global_scope)
1760 tree inherited_decl = lookup_name (name);
1761 if (inherited_decl && inherited_decl != old)
1763 warn_if_shadowing (x, inherited_decl);
1764 scope->shadowed = tree_cons (name, inherited_decl,
1769 /* Install the new declaration in the requested scope. */
1770 IDENTIFIER_SYMBOL_VALUE (name) = x;
1771 C_DECL_INVISIBLE (x) = 0;
1773 /* If x's type is incomplete because it's based on a
1774 structure or union which has not yet been fully declared,
1775 attach it to that structure or union type, so we can go
1776 back and complete the variable declaration later, if the
1777 structure or union gets fully declared.
1779 If the input is erroneous, we can have error_mark in the type
1780 slot (e.g. "f(void a, ...)") - that doesn't count as an
1782 if (TREE_TYPE (x) != error_mark_node
1783 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1785 tree element = TREE_TYPE (x);
1787 while (TREE_CODE (element) == ARRAY_TYPE)
1788 element = TREE_TYPE (element);
1789 element = TYPE_MAIN_VARIANT (element);
1791 if ((TREE_CODE (element) == RECORD_TYPE
1792 || TREE_CODE (element) == UNION_TYPE)
1793 && (TREE_CODE (x) != TYPE_DECL
1794 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
1795 && !COMPLETE_TYPE_P (element))
1796 C_TYPE_INCOMPLETE_VARS (element)
1797 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
1801 if (TREE_CODE (x) == PARM_DECL)
1802 SCOPE_LIST_APPEND (scope, parms, x);
1804 SCOPE_LIST_APPEND (scope, names, x);
1809 /* Record X as belonging to the global scope (C99 "file scope").
1810 This is used only internally by the Objective-C front end,
1811 and is limited to its needs. duplicate_decls is not called;
1812 if there is any preexisting decl for this identifier, it is an ICE. */
1815 pushdecl_top_level (tree x)
1819 if (TREE_CODE (x) != VAR_DECL)
1822 name = DECL_NAME (x);
1824 if (IDENTIFIER_SYMBOL_VALUE (name))
1827 DECL_CONTEXT (x) = current_file_decl;
1828 IDENTIFIER_SYMBOL_VALUE (name) = x;
1830 SCOPE_LIST_APPEND (global_scope, names, x);
1834 /* Generate an implicit declaration for identifier FUNCTIONID as a
1835 function of type int (). */
1838 implicitly_declare (tree functionid)
1840 tree decl = any_external_decl (functionid);
1844 /* Implicit declaration of a function already declared
1845 (somehow) in a different scope, or as a built-in.
1846 If this is the first time this has happened, warn;
1847 then recycle the old declaration. */
1848 if (!C_DECL_IMPLICIT (decl))
1850 implicit_decl_warning (DECL_NAME (decl));
1851 if (! DECL_FILE_SCOPE_P (decl))
1852 warning ("%Jprevious declaration of '%D'", decl, decl);
1853 C_DECL_IMPLICIT (decl) = 1;
1855 /* If this function is global, then it must already be in the
1856 global scope, so there's no need to push it again. */
1857 if (current_scope == global_scope)
1859 /* If this is a local declaration, make a copy; we can't have
1860 the same DECL listed in two different scopes. */
1861 return pushdecl (copy_node (decl));
1864 /* Not seen before. */
1865 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1866 DECL_EXTERNAL (decl) = 1;
1867 TREE_PUBLIC (decl) = 1;
1868 C_DECL_IMPLICIT (decl) = 1;
1869 implicit_decl_warning (functionid);
1871 /* C89 says implicit declarations are in the innermost block.
1872 So we record the decl in the standard fashion. */
1873 decl = pushdecl (decl);
1875 /* No need to call objc_check_decl here - it's a function type. */
1876 rest_of_decl_compilation (decl, NULL, 0, 0);
1878 /* Write a record describing this implicit function declaration
1879 to the prototypes file (if requested). */
1880 gen_aux_info_record (decl, 0, 1, 0);
1882 /* Possibly apply some default attributes to this implicit declaration. */
1883 decl_attributes (&decl, NULL_TREE, 0);
1889 implicit_decl_warning (tree id)
1891 const char *name = IDENTIFIER_POINTER (id);
1892 if (mesg_implicit_function_declaration == 2)
1893 error ("implicit declaration of function `%s'", name);
1894 else if (mesg_implicit_function_declaration == 1)
1895 warning ("implicit declaration of function `%s'", name);
1898 /* Issue an error message for a reference to an undeclared variable
1899 ID, including a reference to a builtin outside of function-call
1900 context. Establish a binding of the identifier to error_mark_node
1901 in an appropriate scope, which will suppress further errors for the
1904 undeclared_variable (tree id)
1906 static bool already = false;
1907 struct c_scope *scope;
1909 if (current_function_decl == 0)
1911 error ("`%s' undeclared here (not in a function)",
1912 IDENTIFIER_POINTER (id));
1913 scope = current_scope;
1917 error ("`%s' undeclared (first use in this function)",
1918 IDENTIFIER_POINTER (id));
1922 error ("(Each undeclared identifier is reported only once");
1923 error ("for each function it appears in.)");
1927 scope = current_function_scope;
1930 scope->shadowed = tree_cons (id, IDENTIFIER_SYMBOL_VALUE (id),
1932 IDENTIFIER_SYMBOL_VALUE (id) = error_mark_node;
1935 /* Subroutine of lookup_label, declare_label, define_label: construct a
1936 LABEL_DECL with all the proper frills. */
1939 make_label (tree name, location_t location)
1941 tree label = build_decl (LABEL_DECL, name, void_type_node);
1943 DECL_CONTEXT (label) = current_function_decl;
1944 DECL_MODE (label) = VOIDmode;
1945 DECL_SOURCE_LOCATION (label) = location;
1950 /* Another subroutine of lookup_label, declare_label, define_label:
1951 set up the binding of name to LABEL_DECL in the given SCOPE. */
1954 bind_label (tree name, tree label, struct c_scope *scope)
1956 if (IDENTIFIER_LABEL_VALUE (name))
1957 scope->shadowed = tree_cons (name, IDENTIFIER_LABEL_VALUE (name),
1959 IDENTIFIER_LABEL_VALUE (name) = label;
1961 SCOPE_LIST_APPEND (scope, names, label);
1964 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
1965 Create one if none exists so far for the current function.
1966 This is called when a label is used in a goto expression or
1967 has its address taken. */
1970 lookup_label (tree name)
1974 if (current_function_decl == 0)
1976 error ("label %s referenced outside of any function",
1977 IDENTIFIER_POINTER (name));
1981 /* Use a label already defined or ref'd with this name, but not if
1982 it is inherited from a containing function and wasn't declared
1984 label = IDENTIFIER_LABEL_VALUE (name);
1985 if (label && (DECL_CONTEXT (label) == current_function_decl
1986 || C_DECLARED_LABEL_FLAG (label)))
1988 /* If the label has only been declared, update its apparent
1989 location to point here, for better diagnostics if it
1990 turns out not to have been defined. */
1991 if (!TREE_USED (label))
1992 DECL_SOURCE_LOCATION (label) = input_location;
1996 /* No label binding for that identifier; make one. */
1997 label = make_label (name, input_location);
1999 /* Ordinary labels go in the current function scope. */
2000 bind_label (name, label, current_function_scope);
2004 /* Make a label named NAME in the current function, shadowing silently
2005 any that may be inherited from containing functions or containing
2006 scopes. This is called for __label__ declarations. */
2008 /* Note that valid use, if the label being shadowed comes from another
2009 scope in the same function, requires calling declare_nonlocal_label
2010 right away. (Is this still true? -zw 2003-07-17) */
2013 declare_label (tree name)
2015 tree label = IDENTIFIER_LABEL_VALUE (name);
2018 /* Check to make sure that the label hasn't already been declared
2020 for (dup = current_scope->names; dup; dup = TREE_CHAIN (dup))
2023 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2024 error ("%Jthis is a previous declaration", dup);
2026 /* Just use the previous declaration. */
2030 label = make_label (name, input_location);
2031 C_DECLARED_LABEL_FLAG (label) = 1;
2033 /* Declared labels go in the current scope. */
2034 bind_label (name, label, current_scope);
2038 /* Define a label, specifying the location in the source file.
2039 Return the LABEL_DECL node for the label, if the definition is valid.
2040 Otherwise return 0. */
2043 define_label (location_t location, tree name)
2047 /* Find any preexisting label with this name. It is an error
2048 if that label has already been defined in this function, or
2049 if there is a containing function with a declared label with
2051 label = IDENTIFIER_LABEL_VALUE (name);
2054 && ((DECL_CONTEXT (label) == current_function_decl
2055 && DECL_INITIAL (label) != 0)
2056 || (DECL_CONTEXT (label) != current_function_decl
2057 && C_DECLARED_LABEL_FLAG (label))))
2059 error ("%Hduplicate label `%D'", &location, label);
2060 if (DECL_INITIAL (label))
2061 error ("%J`%D' previously defined here", label, label);
2063 error ("%J`%D' previously declared here", label, label);
2066 else if (label && DECL_CONTEXT (label) == current_function_decl)
2068 /* The label has been used or declared already in this function,
2069 but not defined. Update its location to point to this
2071 DECL_SOURCE_LOCATION (label) = location;
2075 /* No label binding for that identifier; make one. */
2076 label = make_label (name, location);
2078 /* Ordinary labels go in the current function scope. */
2079 bind_label (name, label, current_function_scope);
2082 if (warn_traditional && !in_system_header && lookup_name (name))
2083 warning ("%Htraditional C lacks a separate namespace for labels, "
2084 "identifier `%s' conflicts", &location,
2085 IDENTIFIER_POINTER (name));
2087 /* Mark label as having been defined. */
2088 DECL_INITIAL (label) = error_mark_node;
2092 /* Return the list of declarations of the current scope. */
2097 return current_scope->names;
2101 /* Given NAME, an IDENTIFIER_NODE,
2102 return the structure (or union or enum) definition for that name.
2103 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2104 CODE says which kind of type the caller wants;
2105 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2106 If the wrong kind of type is found, an error is reported. */
2109 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2111 tree tag = IDENTIFIER_TAG_VALUE (name);
2117 /* We only care about whether it's in this level if
2118 thislevel_only was set or it might be a type clash. */
2119 if (thislevel_only || TREE_CODE (tag) != code)
2121 if (current_scope == global_scope
2122 || purpose_member (name, current_scope->tags))
2126 if (thislevel_only && !thislevel)
2129 if (TREE_CODE (tag) != code)
2131 /* Definition isn't the kind we were looking for. */
2132 pending_invalid_xref = name;
2133 pending_invalid_xref_location = input_location;
2135 /* If in the same binding level as a declaration as a tag
2136 of a different type, this must not be allowed to
2137 shadow that tag, so give the error immediately.
2138 (For example, "struct foo; union foo;" is invalid.) */
2140 pending_xref_error ();
2145 /* Print an error message now
2146 for a recent invalid struct, union or enum cross reference.
2147 We don't print them immediately because they are not invalid
2148 when used in the `struct foo;' construct for shadowing. */
2151 pending_xref_error (void)
2153 if (pending_invalid_xref != 0)
2154 error ("%H`%s' defined as wrong kind of tag",
2155 &pending_invalid_xref_location,
2156 IDENTIFIER_POINTER (pending_invalid_xref));
2157 pending_invalid_xref = 0;
2161 /* Look up NAME in the current scope and its superiors
2162 in the namespace of variables, functions and typedefs.
2163 Return a ..._DECL node of some kind representing its definition,
2164 or return 0 if it is undefined. */
2167 lookup_name (tree name)
2169 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2170 if (decl == 0 || decl == error_mark_node)
2172 if (C_DECL_INVISIBLE (decl))
2177 /* Similar to `lookup_name' but look only at the current scope. */
2180 lookup_name_current_level (tree name)
2182 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2184 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2187 if (current_scope == global_scope)
2190 /* Scan the current scope for a decl with name NAME.
2191 For PARM_DECLs, we have to look at both ->parms and ->names, since
2192 forward parameter declarations wind up on the ->names list. */
2193 if (TREE_CODE (decl) == PARM_DECL
2194 && chain_member (decl, current_scope->parms))
2196 if (chain_member (decl, current_scope->names))
2202 /* Create the predefined scalar types of C,
2203 and some nodes representing standard constants (0, 1, (void *) 0).
2204 Initialize the global scope.
2205 Make definitions for built-in primitive functions. */
2208 c_init_decl_processing (void)
2211 tree ptr_ftype_void, ptr_ftype_ptr;
2212 location_t save_loc = input_location;
2214 /* Adds some ggc roots, and reserved words for c-parse.in. */
2217 current_function_decl = 0;
2219 /* Make the c_scope structure for global names. */
2221 global_scope = current_scope;
2223 /* Declarations from c_common_nodes_and_builtins must not be associated
2224 with this input file, lest we get differences between using and not
2225 using preprocessed headers. */
2226 input_location.file = "<internal>";
2227 input_location.line = 0;
2229 /* Make the DECL for the toplevel file scope. */
2230 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
2232 build_common_tree_nodes (flag_signed_char);
2234 c_common_nodes_and_builtins ();
2236 /* In C, comparisons and TRUTH_* expressions have type int. */
2237 truthvalue_type_node = integer_type_node;
2238 truthvalue_true_node = integer_one_node;
2239 truthvalue_false_node = integer_zero_node;
2241 /* Even in C99, which has a real boolean type. */
2242 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2243 boolean_type_node));
2245 endlink = void_list_node;
2246 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2248 = build_function_type (ptr_type_node,
2249 tree_cons (NULL_TREE, ptr_type_node, endlink));
2251 input_location = save_loc;
2253 pedantic_lvalues = pedantic;
2255 make_fname_decl = c_make_fname_decl;
2256 start_fname_decls ();
2258 first_builtin_decl = global_scope->names;
2259 last_builtin_decl = global_scope->names_last;
2262 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2263 decl, NAME is the initialization string and TYPE_DEP indicates whether
2264 NAME depended on the type of the function. As we don't yet implement
2265 delayed emission of static data, we mark the decl as emitted
2266 so it is not placed in the output. Anything using it must therefore pull
2267 out the STRING_CST initializer directly. FIXME. */
2270 c_make_fname_decl (tree id, int type_dep)
2272 const char *name = fname_as_string (type_dep);
2273 tree decl, type, init;
2274 size_t length = strlen (name);
2276 type = build_array_type
2277 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2278 build_index_type (size_int (length)));
2280 decl = build_decl (VAR_DECL, id, type);
2282 TREE_STATIC (decl) = 1;
2283 TREE_READONLY (decl) = 1;
2284 DECL_ARTIFICIAL (decl) = 1;
2286 init = build_string (length + 1, name);
2287 TREE_TYPE (init) = type;
2288 DECL_INITIAL (decl) = init;
2290 TREE_USED (decl) = 1;
2292 if (current_function_decl)
2294 DECL_CONTEXT (decl) = current_function_decl;
2295 IDENTIFIER_SYMBOL_VALUE (id) = decl;
2296 SCOPE_LIST_APPEND (current_function_scope, names, decl);
2299 finish_decl (decl, init, NULL_TREE);
2304 /* Return a definition for a builtin function named NAME and whose data type
2305 is TYPE. TYPE should be a function type with argument types.
2306 FUNCTION_CODE tells later passes how to compile calls to this function.
2307 See tree.h for its possible values.
2309 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2310 the name to be called if we can't opencode the function. If
2311 ATTRS is nonzero, use that for the function's attribute list. */
2314 builtin_function (const char *name, tree type, int function_code,
2315 enum built_in_class class, const char *library_name,
2318 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2319 DECL_EXTERNAL (decl) = 1;
2320 TREE_PUBLIC (decl) = 1;
2322 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2323 make_decl_rtl (decl, NULL);
2325 DECL_BUILT_IN_CLASS (decl) = class;
2326 DECL_FUNCTION_CODE (decl) = function_code;
2328 /* Warn if a function in the namespace for users
2329 is used without an occasion to consider it declared. */
2330 if (name[0] != '_' || name[1] != '_')
2331 C_DECL_INVISIBLE (decl) = 1;
2333 /* Possibly apply some default attributes to this built-in function. */
2335 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2337 decl_attributes (&decl, NULL_TREE, 0);
2342 /* Called when a declaration is seen that contains no names to declare.
2343 If its type is a reference to a structure, union or enum inherited
2344 from a containing scope, shadow that tag name for the current scope
2345 with a forward reference.
2346 If its type defines a new named structure or union
2347 or defines an enum, it is valid but we need not do anything here.
2348 Otherwise, it is an error. */
2351 shadow_tag (tree declspecs)
2353 shadow_tag_warned (declspecs, 0);
2357 shadow_tag_warned (tree declspecs, int warned)
2360 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2367 pending_invalid_xref = 0;
2369 /* Remove the attributes from declspecs, since they will confuse the
2371 split_specs_attrs (declspecs, &specs, &attrs);
2373 for (link = specs; link; link = TREE_CHAIN (link))
2375 tree value = TREE_VALUE (link);
2376 enum tree_code code = TREE_CODE (value);
2378 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2379 /* Used to test also that TYPE_SIZE (value) != 0.
2380 That caused warning for `struct foo;' at top level in the file. */
2382 tree name = TYPE_NAME (value);
2389 if (warned != 1 && code != ENUMERAL_TYPE)
2390 /* Empty unnamed enum OK */
2392 pedwarn ("unnamed struct/union that defines no instances");
2398 t = lookup_tag (code, name, 1);
2402 t = make_node (code);
2409 if (!warned && ! in_system_header)
2411 warning ("useless keyword or type name in empty declaration");
2418 error ("two types specified in one empty declaration");
2423 pedwarn ("empty declaration");
2427 /* Construct an array declarator. EXPR is the expression inside [], or
2428 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2429 to the pointer to which a parameter array is converted). STATIC_P is
2430 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2431 is nonzero is the array is [*], a VLA of unspecified length which is
2432 nevertheless a complete type (not currently implemented by GCC),
2433 zero otherwise. The declarator is constructed as an ARRAY_REF
2434 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2435 left of the [] (filled by in set_array_declarator_type) and operand 1
2436 is the expression inside; whose TREE_TYPE is the type qualifiers and
2437 which has TREE_STATIC set if "static" is used. */
2440 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2443 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2444 TREE_TYPE (decl) = quals;
2445 TREE_STATIC (decl) = (static_p ? 1 : 0);
2446 if (pedantic && !flag_isoc99)
2448 if (static_p || quals != NULL_TREE)
2449 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2451 pedwarn ("ISO C90 does not support `[*]' array declarators");
2454 warning ("GCC does not yet properly implement `[*]' array declarators");
2458 /* Set the type of an array declarator. DECL is the declarator, as
2459 constructed by build_array_declarator; TYPE is what appears on the left
2460 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2461 abstract declarator, zero otherwise; this is used to reject static and
2462 type qualifiers in abstract declarators, where they are not in the
2466 set_array_declarator_type (tree decl, tree type, int abstract_p)
2468 TREE_OPERAND (decl, 0) = type;
2469 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2470 error ("static or type qualifiers in abstract declarator");
2474 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2477 groktypename (tree typename)
2481 if (TREE_CODE (typename) != TREE_LIST)
2484 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2486 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0,
2489 /* Apply attributes. */
2490 decl_attributes (&typename, attrs, 0);
2495 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2498 groktypename_in_parm_context (tree typename)
2500 if (TREE_CODE (typename) != TREE_LIST)
2502 return grokdeclarator (TREE_VALUE (typename),
2503 TREE_PURPOSE (typename),
2507 /* Decode a declarator in an ordinary declaration or data definition.
2508 This is called as soon as the type information and variable name
2509 have been parsed, before parsing the initializer if any.
2510 Here we create the ..._DECL node, fill in its type,
2511 and put it on the list of decls for the current context.
2512 The ..._DECL node is returned as the value.
2514 Exception: for arrays where the length is not specified,
2515 the type is left null, to be filled in by `finish_decl'.
2517 Function definitions do not come here; they go to start_function
2518 instead. However, external and forward declarations of functions
2519 do go through here. Structure field declarations are done by
2520 grokfield and not through here. */
2523 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2528 /* An object declared as __attribute__((deprecated)) suppresses
2529 warnings of uses of other deprecated items. */
2530 if (lookup_attribute ("deprecated", attributes))
2531 deprecated_state = DEPRECATED_SUPPRESS;
2533 decl = grokdeclarator (declarator, declspecs,
2534 NORMAL, initialized, NULL);
2536 deprecated_state = DEPRECATED_NORMAL;
2538 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2539 && MAIN_NAME_P (DECL_NAME (decl)))
2540 warning ("%J'%D' is usually a function", decl, decl);
2543 /* Is it valid for this decl to have an initializer at all?
2544 If not, set INITIALIZED to zero, which will indirectly
2545 tell `finish_decl' to ignore the initializer once it is parsed. */
2546 switch (TREE_CODE (decl))
2549 error ("typedef `%s' is initialized (use __typeof__ instead)",
2550 IDENTIFIER_POINTER (DECL_NAME (decl)));
2555 error ("function `%s' is initialized like a variable",
2556 IDENTIFIER_POINTER (DECL_NAME (decl)));
2561 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2562 error ("parameter `%s' is initialized",
2563 IDENTIFIER_POINTER (DECL_NAME (decl)));
2568 /* Don't allow initializations for incomplete types
2569 except for arrays which might be completed by the initialization. */
2571 /* This can happen if the array size is an undefined macro. We already
2572 gave a warning, so we don't need another one. */
2573 if (TREE_TYPE (decl) == error_mark_node)
2575 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2577 /* A complete type is ok if size is fixed. */
2579 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2580 || C_DECL_VARIABLE_SIZE (decl))
2582 error ("variable-sized object may not be initialized");
2586 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2588 error ("variable `%s' has initializer but incomplete type",
2589 IDENTIFIER_POINTER (DECL_NAME (decl)));
2592 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2594 error ("elements of array `%s' have incomplete type",
2595 IDENTIFIER_POINTER (DECL_NAME (decl)));
2602 DECL_EXTERNAL (decl) = 0;
2603 if (current_scope == global_scope)
2604 TREE_STATIC (decl) = 1;
2606 /* Tell `pushdecl' this is an initialized decl
2607 even though we don't yet have the initializer expression.
2608 Also tell `finish_decl' it may store the real initializer. */
2609 DECL_INITIAL (decl) = error_mark_node;
2612 /* If this is a function declaration, write a record describing it to the
2613 prototypes file (if requested). */
2615 if (TREE_CODE (decl) == FUNCTION_DECL)
2616 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2618 /* ANSI specifies that a tentative definition which is not merged with
2619 a non-tentative definition behaves exactly like a definition with an
2620 initializer equal to zero. (Section 3.7.2)
2622 -fno-common gives strict ANSI behavior, though this tends to break
2623 a large body of code that grew up without this rule.
2625 Thread-local variables are never common, since there's no entrenched
2626 body of code to break, and it allows more efficient variable references
2627 in the presence of dynamic linking. */
2629 if (TREE_CODE (decl) == VAR_DECL
2631 && TREE_PUBLIC (decl)
2632 && !DECL_THREAD_LOCAL (decl)
2634 DECL_COMMON (decl) = 1;
2636 /* Set attributes here so if duplicate decl, will have proper attributes. */
2637 decl_attributes (&decl, attributes, 0);
2639 if (TREE_CODE (decl) == FUNCTION_DECL
2640 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2642 tree ce = declarator;
2644 if (TREE_CODE (ce) == INDIRECT_REF)
2645 ce = TREE_OPERAND (declarator, 0);
2646 if (TREE_CODE (ce) == CALL_EXPR)
2648 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2649 for (; args; args = TREE_CHAIN (args))
2651 tree type = TREE_TYPE (args);
2652 if (INTEGRAL_TYPE_P (type)
2653 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2654 DECL_ARG_TYPE (args) = integer_type_node;
2659 if (TREE_CODE (decl) == FUNCTION_DECL
2660 && DECL_DECLARED_INLINE_P (decl)
2661 && DECL_UNINLINABLE (decl)
2662 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2663 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2665 /* Add this decl to the current scope.
2666 TEM may equal DECL or it may be a previous decl of the same name. */
2667 tem = pushdecl (decl);
2669 /* For a local variable, define the RTL now. */
2670 if (current_scope != global_scope
2671 /* But not if this is a duplicate decl
2672 and we preserved the rtl from the previous one
2673 (which may or may not happen). */
2674 && !DECL_RTL_SET_P (tem)
2675 && DECL_FILE_SCOPE_P (tem))
2677 if (TREE_TYPE (tem) != error_mark_node
2678 && (COMPLETE_TYPE_P (TREE_TYPE (tem))
2679 || (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2680 && DECL_INITIAL (tem) != 0)))
2687 /* Finish processing of a declaration;
2688 install its initial value.
2689 If the length of an array type is not known before,
2690 it must be determined now, from the initial value, or it is an error. */
2693 finish_decl (tree decl, tree init, tree asmspec_tree)
2695 tree type = TREE_TYPE (decl);
2696 int was_incomplete = (DECL_SIZE (decl) == 0);
2697 const char *asmspec = 0;
2699 /* If a name was specified, get the string. */
2700 if (current_scope == global_scope)
2701 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2703 asmspec = TREE_STRING_POINTER (asmspec_tree);
2705 /* If `start_decl' didn't like having an initialization, ignore it now. */
2706 if (init != 0 && DECL_INITIAL (decl) == 0)
2709 /* Don't crash if parm is initialized. */
2710 if (TREE_CODE (decl) == PARM_DECL)
2714 store_init_value (decl, init);
2716 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
2717 || TREE_CODE (decl) == FUNCTION_DECL
2718 || TREE_CODE (decl) == FIELD_DECL))
2719 objc_check_decl (decl);
2721 /* Deduce size of array from initialization, if not already known. */
2722 if (TREE_CODE (type) == ARRAY_TYPE
2723 && TYPE_DOMAIN (type) == 0
2724 && TREE_CODE (decl) != TYPE_DECL)
2727 = (TREE_STATIC (decl)
2728 /* Even if pedantic, an external linkage array
2729 may have incomplete type at first. */
2730 ? pedantic && !TREE_PUBLIC (decl)
2731 : !DECL_EXTERNAL (decl));
2733 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2735 /* Get the completed type made by complete_array_type. */
2736 type = TREE_TYPE (decl);
2739 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2741 else if (failure == 2)
2744 error ("%Jarray size missing in '%D'", decl, decl);
2745 /* If a `static' var's size isn't known,
2746 make it extern as well as static, so it does not get
2748 If it is not `static', then do not mark extern;
2749 finish_incomplete_decl will give it a default size
2750 and it will get allocated. */
2751 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2752 DECL_EXTERNAL (decl) = 1;
2755 /* TYPE_MAX_VALUE is always one less than the number of elements
2756 in the array, because we start counting at zero. Therefore,
2757 warn only if the value is less than zero. */
2758 else if (pedantic && TYPE_DOMAIN (type) != 0
2759 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2760 error ("%Jzero or negative size array '%D'", decl, decl);
2762 layout_decl (decl, 0);
2765 if (TREE_CODE (decl) == VAR_DECL)
2767 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2768 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2769 layout_decl (decl, 0);
2771 if (DECL_SIZE (decl) == 0
2772 /* Don't give an error if we already gave one earlier. */
2773 && TREE_TYPE (decl) != error_mark_node
2774 && (TREE_STATIC (decl)
2776 /* A static variable with an incomplete type
2777 is an error if it is initialized.
2778 Also if it is not file scope.
2779 Otherwise, let it through, but if it is not `extern'
2780 then it may cause an error message later. */
2781 (DECL_INITIAL (decl) != 0
2782 || !DECL_FILE_SCOPE_P (decl))
2784 /* An automatic variable with an incomplete type
2786 !DECL_EXTERNAL (decl)))
2788 error ("%Jstorage size of '%D' isn't known", decl, decl);
2789 TREE_TYPE (decl) = error_mark_node;
2792 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2793 && DECL_SIZE (decl) != 0)
2795 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2796 constant_expression_warning (DECL_SIZE (decl));
2798 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2801 if (TREE_USED (type))
2802 TREE_USED (decl) = 1;
2805 /* If this is a function and an assembler name is specified, reset DECL_RTL
2806 so we can give it its new name. Also, update built_in_decls if it
2807 was a normal built-in. */
2808 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2810 /* ASMSPEC is given, and not the name of a register. Mark the
2811 name with a star so assemble_name won't munge it. */
2812 char *starred = alloca (strlen (asmspec) + 2);
2814 strcpy (starred + 1, asmspec);
2816 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2818 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2819 SET_DECL_RTL (builtin, NULL_RTX);
2820 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2821 #ifdef TARGET_MEM_FUNCTIONS
2822 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2823 init_block_move_fn (starred);
2824 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2825 init_block_clear_fn (starred);
2827 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2828 init_block_move_fn (starred);
2829 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2830 init_block_clear_fn (starred);
2833 SET_DECL_RTL (decl, NULL_RTX);
2834 change_decl_assembler_name (decl, get_identifier (starred));
2837 /* If #pragma weak was used, mark the decl weak now. */
2838 if (current_scope == global_scope)
2839 maybe_apply_pragma_weak (decl);
2841 /* Output the assembler code and/or RTL code for variables and functions,
2842 unless the type is an undefined structure or union.
2843 If not, it will get done when the type is completed. */
2845 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2847 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2848 if (c_dialect_objc ())
2849 objc_check_decl (decl);
2851 if (DECL_FILE_SCOPE_P (decl))
2853 if (DECL_INITIAL (decl) == NULL_TREE
2854 || DECL_INITIAL (decl) == error_mark_node)
2855 /* Don't output anything
2856 when a tentative file-scope definition is seen.
2857 But at end of compilation, do output code for them. */
2858 DECL_DEFER_OUTPUT (decl) = 1;
2859 rest_of_decl_compilation (decl, asmspec, true, 0);
2863 /* This is a local variable. If there is an ASMSPEC, the
2864 user has requested that we handle it specially. */
2867 /* In conjunction with an ASMSPEC, the `register'
2868 keyword indicates that we should place the variable
2869 in a particular register. */
2870 if (DECL_REGISTER (decl))
2871 DECL_C_HARD_REGISTER (decl) = 1;
2873 /* If this is not a static variable, issue a warning.
2874 It doesn't make any sense to give an ASMSPEC for an
2875 ordinary, non-register local variable. Historically,
2876 GCC has accepted -- but ignored -- the ASMSPEC in
2878 if (TREE_CODE (decl) == VAR_DECL
2879 && !DECL_REGISTER (decl)
2880 && !TREE_STATIC (decl))
2881 warning ("%Jignoring asm-specifier for non-static local "
2882 "variable '%D'", decl, decl);
2884 change_decl_assembler_name (decl, get_identifier (asmspec));
2887 if (TREE_CODE (decl) != FUNCTION_DECL)
2888 add_decl_stmt (decl);
2891 if (!DECL_FILE_SCOPE_P (decl))
2893 /* Recompute the RTL of a local array now
2894 if it used to be an incomplete type. */
2896 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2898 /* If we used it already as memory, it must stay in memory. */
2899 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2900 /* If it's still incomplete now, no init will save it. */
2901 if (DECL_SIZE (decl) == 0)
2902 DECL_INITIAL (decl) = 0;
2907 /* If this was marked 'used', be sure it will be output. */
2908 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2909 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2911 if (TREE_CODE (decl) == TYPE_DECL)
2912 rest_of_decl_compilation (decl, NULL, DECL_FILE_SCOPE_P (decl), 0);
2914 /* At the end of a declaration, throw away any variable type sizes
2915 of types defined inside that declaration. There is no use
2916 computing them in the following function definition. */
2917 if (current_scope == global_scope)
2918 get_pending_sizes ();
2920 /* Install a cleanup (aka destructor) if one was given. */
2921 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2923 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2926 static bool eh_initialized_p;
2928 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2929 tree cleanup_decl = lookup_name (cleanup_id);
2932 /* Build "cleanup(&decl)" for the destructor. */
2933 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2934 cleanup = build_tree_list (NULL_TREE, cleanup);
2935 cleanup = build_function_call (cleanup_decl, cleanup);
2937 /* Don't warn about decl unused; the cleanup uses it. */
2938 TREE_USED (decl) = 1;
2940 /* Initialize EH, if we've been told to do so. */
2941 if (flag_exceptions && !eh_initialized_p)
2943 eh_initialized_p = true;
2944 eh_personality_libfunc
2945 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
2946 ? "__gcc_personality_sj0"
2947 : "__gcc_personality_v0");
2948 using_eh_for_cleanups ();
2951 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
2956 /* Given a parsed parameter declaration, decode it into a PARM_DECL
2957 and push that on the current scope. */
2960 push_parm_decl (tree parm)
2964 /* Don't attempt to expand sizes while parsing this decl.
2965 (We can get here with i_s_e 1 somehow from Objective-C.) */
2966 int save_immediate_size_expand = immediate_size_expand;
2967 immediate_size_expand = 0;
2969 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
2970 TREE_PURPOSE (TREE_PURPOSE (parm)),
2972 decl_attributes (&decl, TREE_VALUE (parm), 0);
2974 decl = pushdecl (decl);
2976 finish_decl (decl, NULL_TREE, NULL_TREE);
2978 immediate_size_expand = save_immediate_size_expand;
2981 /* Mark all the parameter declarations to date as forward decls,
2982 shift them to the variables list, and reset the parameters list.
2983 Also diagnose use of this extension. */
2986 mark_forward_parm_decls (void)
2990 if (pedantic && !current_scope->warned_forward_parm_decls)
2992 pedwarn ("ISO C forbids forward parameter declarations");
2993 current_scope->warned_forward_parm_decls = true;
2996 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
2997 TREE_ASM_WRITTEN (parm) = 1;
2999 SCOPE_LIST_CONCAT (current_scope, names, current_scope, parms);
3000 current_scope->parms = 0;
3001 current_scope->parms_last = 0;
3004 static GTY(()) int compound_literal_number;
3006 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3007 literal, which may be an incomplete array type completed by the
3008 initializer; INIT is a CONSTRUCTOR that initializes the compound
3012 build_compound_literal (tree type, tree init)
3014 /* We do not use start_decl here because we have a type, not a declarator;
3015 and do not use finish_decl because the decl should be stored inside
3016 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3017 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3020 DECL_EXTERNAL (decl) = 0;
3021 TREE_PUBLIC (decl) = 0;
3022 TREE_STATIC (decl) = (current_scope == global_scope);
3023 DECL_CONTEXT (decl) = current_function_decl;
3024 TREE_USED (decl) = 1;
3025 TREE_TYPE (decl) = type;
3026 TREE_READONLY (decl) = TREE_READONLY (type);
3027 store_init_value (decl, init);
3029 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3031 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3036 type = TREE_TYPE (decl);
3037 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3038 return error_mark_node;
3040 stmt = build_stmt (DECL_STMT, decl);
3041 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3042 TREE_SIDE_EFFECTS (complit) = 1;
3044 layout_decl (decl, 0);
3046 if (TREE_STATIC (decl))
3048 /* This decl needs a name for the assembler output. We also need
3049 a unique suffix to be added to the name. */
3052 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3053 compound_literal_number);
3054 compound_literal_number++;
3055 DECL_NAME (decl) = get_identifier (name);
3056 DECL_DEFER_OUTPUT (decl) = 1;
3057 DECL_COMDAT (decl) = 1;
3058 DECL_ARTIFICIAL (decl) = 1;
3060 rest_of_decl_compilation (decl, NULL, 1, 0);
3066 /* Make TYPE a complete type based on INITIAL_VALUE.
3067 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3068 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3071 complete_array_type (tree type, tree initial_value, int do_default)
3073 tree maxindex = NULL_TREE;
3078 /* Note MAXINDEX is really the maximum index,
3079 one less than the size. */
3080 if (TREE_CODE (initial_value) == STRING_CST)
3083 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3084 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3087 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3089 tree elts = CONSTRUCTOR_ELTS (initial_value);
3090 maxindex = build_int_2 (-1, -1);
3091 for (; elts; elts = TREE_CHAIN (elts))
3093 if (TREE_PURPOSE (elts))
3094 maxindex = TREE_PURPOSE (elts);
3096 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3097 maxindex, integer_one_node));
3099 maxindex = copy_node (maxindex);
3103 /* Make an error message unless that happened already. */
3104 if (initial_value != error_mark_node)
3107 /* Prevent further error messages. */
3108 maxindex = build_int_2 (0, 0);
3115 maxindex = build_int_2 (0, 0);
3121 TYPE_DOMAIN (type) = build_index_type (maxindex);
3122 if (!TREE_TYPE (maxindex))
3123 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3126 /* Lay out the type now that we can get the real answer. */
3133 /* Determine whether TYPE is a structure with a flexible array member,
3134 or a union containing such a structure (possibly recursively). */
3137 flexible_array_type_p (tree type)
3140 switch (TREE_CODE (type))
3143 x = TYPE_FIELDS (type);
3146 while (TREE_CHAIN (x) != NULL_TREE)
3148 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3149 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3150 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3151 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3155 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3157 if (flexible_array_type_p (TREE_TYPE (x)))
3166 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3167 replacing with appropriate values if they are invalid. */
3169 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3172 unsigned int max_width;
3173 unsigned HOST_WIDE_INT w;
3174 const char *name = orig_name ? orig_name: _("<anonymous>");
3177 STRIP_NOPS (*width);
3179 /* Detect and ignore out of range field width and process valid
3181 if (TREE_CODE (*width) != INTEGER_CST)
3183 error ("bit-field `%s' width not an integer constant", name);
3184 *width = integer_one_node;
3188 constant_expression_warning (*width);
3189 if (tree_int_cst_sgn (*width) < 0)
3191 error ("negative width in bit-field `%s'", name);
3192 *width = integer_one_node;
3194 else if (integer_zerop (*width) && orig_name)
3196 error ("zero width for bit-field `%s'", name);
3197 *width = integer_one_node;
3201 /* Detect invalid bit-field type. */
3202 if (TREE_CODE (*type) != INTEGER_TYPE
3203 && TREE_CODE (*type) != BOOLEAN_TYPE
3204 && TREE_CODE (*type) != ENUMERAL_TYPE)
3206 error ("bit-field `%s' has invalid type", name);
3207 *type = unsigned_type_node;
3210 type_mv = TYPE_MAIN_VARIANT (*type);
3212 && type_mv != integer_type_node
3213 && type_mv != unsigned_type_node
3214 && type_mv != boolean_type_node)
3215 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3217 if (type_mv == boolean_type_node)
3218 max_width = CHAR_TYPE_SIZE;
3220 max_width = TYPE_PRECISION (*type);
3222 if (0 < compare_tree_int (*width, max_width))
3224 error ("width of `%s' exceeds its type", name);
3226 *width = build_int_2 (w, 0);
3229 w = tree_low_cst (*width, 1);
3231 if (TREE_CODE (*type) == ENUMERAL_TYPE
3232 && (w < min_precision (TYPE_MIN_VALUE (*type), TREE_UNSIGNED (*type))
3233 || w < min_precision (TYPE_MAX_VALUE (*type), TREE_UNSIGNED (*type))))
3234 warning ("`%s' is narrower than values of its type", name);
3237 /* Given declspecs and a declarator,
3238 determine the name and type of the object declared
3239 and construct a ..._DECL node for it.
3240 (In one case we can return a ..._TYPE node instead.
3241 For invalid input we sometimes return 0.)
3243 DECLSPECS is a chain of tree_list nodes whose value fields
3244 are the storage classes and type specifiers.
3246 DECL_CONTEXT says which syntactic context this declaration is in:
3247 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3248 FUNCDEF for a function definition. Like NORMAL but a few different
3249 error messages in each case. Return value may be zero meaning
3250 this definition is too screwy to try to parse.
3251 PARM for a parameter declaration (either within a function prototype
3252 or before a function body). Make a PARM_DECL, or return void_type_node.
3253 TYPENAME if for a typename (in a cast or sizeof).
3254 Don't make a DECL node; just return the ..._TYPE node.
3255 FIELD for a struct or union field; make a FIELD_DECL.
3256 INITIALIZED is 1 if the decl has an initializer.
3257 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3258 representing the width of the bit-field.
3260 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3261 It may also be so in the PARM case, for a prototype where the
3262 argument type is specified but not the name.
3264 This function is where the complicated C meanings of `static'
3265 and `extern' are interpreted. */
3268 grokdeclarator (tree declarator, tree declspecs,
3269 enum decl_context decl_context, int initialized, tree *width)
3273 tree type = NULL_TREE;
3278 int type_quals = TYPE_UNQUALIFIED;
3280 int explicit_int = 0;
3281 int explicit_char = 0;
3282 int defaulted_int = 0;
3283 tree typedef_decl = 0;
3284 const char *name, *orig_name;
3285 tree typedef_type = 0;
3286 int funcdef_flag = 0;
3287 enum tree_code innermost_code = ERROR_MARK;
3288 int size_varies = 0;
3289 tree decl_attr = NULL_TREE;
3290 tree array_ptr_quals = NULL_TREE;
3291 int array_parm_static = 0;
3292 tree returned_attrs = NULL_TREE;
3293 bool bitfield = width != NULL;
3296 if (decl_context == FUNCDEF)
3297 funcdef_flag = 1, decl_context = NORMAL;
3299 /* Look inside a declarator for the name being declared
3300 and get it as a string, for an error message. */
3302 tree decl = declarator;
3306 switch (TREE_CODE (decl))
3311 innermost_code = TREE_CODE (decl);
3312 decl = TREE_OPERAND (decl, 0);
3316 decl = TREE_VALUE (decl);
3319 case IDENTIFIER_NODE:
3320 name = IDENTIFIER_POINTER (decl);
3332 /* A function definition's declarator must have the form of
3333 a function declarator. */
3335 if (funcdef_flag && innermost_code != CALL_EXPR)
3338 /* If this looks like a function definition, make it one,
3339 even if it occurs where parms are expected.
3340 Then store_parm_decls will reject it and not use it as a parm. */
3341 if (decl_context == NORMAL && !funcdef_flag
3342 && current_scope->parm_flag)
3343 decl_context = PARM;
3345 /* Look through the decl specs and record which ones appear.
3346 Some typespecs are defined as built-in typenames.
3347 Others, the ones that are modifiers of other types,
3348 are represented by bits in SPECBITS: set the bits for
3349 the modifiers that appear. Storage class keywords are also in SPECBITS.
3351 If there is a typedef name or a type, store the type in TYPE.
3352 This includes builtin typedefs such as `int'.
3354 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3355 and did not come from a user typedef.
3357 Set LONGLONG if `long' is mentioned twice. */
3359 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3361 tree id = TREE_VALUE (spec);
3363 /* If the entire declaration is itself tagged as deprecated then
3364 suppress reports of deprecated items. */
3365 if (id && TREE_DEPRECATED (id))
3367 if (deprecated_state != DEPRECATED_SUPPRESS)
3368 warn_deprecated_use (id);
3371 if (id == ridpointers[(int) RID_INT])
3373 if (id == ridpointers[(int) RID_CHAR])
3376 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3378 enum rid i = C_RID_CODE (id);
3379 if ((int) i <= (int) RID_LAST_MODIFIER)
3381 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3384 error ("`long long long' is too long for GCC");
3387 if (pedantic && !flag_isoc99 && ! in_system_header
3389 pedwarn ("ISO C90 does not support `long long'");
3393 else if (specbits & (1 << (int) i))
3395 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3397 if (pedantic && !flag_isoc99)
3398 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3401 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3404 /* Diagnose "__thread extern". Recall that this list
3405 is in the reverse order seen in the text. */
3407 && (specbits & (1 << (int) RID_EXTERN
3408 | 1 << (int) RID_STATIC)))
3410 if (specbits & 1 << (int) RID_EXTERN)
3411 error ("`__thread' before `extern'");
3413 error ("`__thread' before `static'");
3416 specbits |= 1 << (int) i;
3421 error ("two or more data types in declaration of `%s'", name);
3422 /* Actual typedefs come to us as TYPE_DECL nodes. */
3423 else if (TREE_CODE (id) == TYPE_DECL)
3425 if (TREE_TYPE (id) == error_mark_node)
3426 ; /* Allow the type to default to int to avoid cascading errors. */
3429 type = TREE_TYPE (id);
3430 decl_attr = DECL_ATTRIBUTES (id);
3434 /* Built-in types come as identifiers. */
3435 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3437 tree t = lookup_name (id);
3438 if (TREE_TYPE (t) == error_mark_node)
3440 else if (!t || TREE_CODE (t) != TYPE_DECL)
3441 error ("`%s' fails to be a typedef or built in type",
3442 IDENTIFIER_POINTER (id));
3445 type = TREE_TYPE (t);
3449 else if (TREE_CODE (id) != ERROR_MARK)
3456 typedef_type = type;
3458 size_varies = C_TYPE_VARIABLE_SIZE (type);
3460 /* No type at all: default to `int', and set DEFAULTED_INT
3461 because it was not a user-defined typedef. */
3465 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3466 | (1 << (int) RID_SIGNED)
3467 | (1 << (int) RID_UNSIGNED)
3468 | (1 << (int) RID_COMPLEX))))
3469 /* Don't warn about typedef foo = bar. */
3470 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3471 && ! in_system_header)
3473 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3474 and this is a function, or if -Wimplicit; prefer the former
3475 warning since it is more explicit. */
3476 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3478 warn_about_return_type = 1;
3479 else if (warn_implicit_int || flag_isoc99)
3480 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3485 type = integer_type_node;
3488 /* Now process the modifiers that were specified
3489 and check for invalid combinations. */
3491 /* Long double is a special combination. */
3493 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3494 && TYPE_MAIN_VARIANT (type) == double_type_node)
3496 specbits &= ~(1 << (int) RID_LONG);
3497 type = long_double_type_node;
3500 /* Check all other uses of type modifiers. */
3502 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3503 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3507 if ((specbits & 1 << (int) RID_LONG)
3508 && (specbits & 1 << (int) RID_SHORT))
3509 error ("both long and short specified for `%s'", name);
3510 else if (((specbits & 1 << (int) RID_LONG)
3511 || (specbits & 1 << (int) RID_SHORT))
3513 error ("long or short specified with char for `%s'", name);
3514 else if (((specbits & 1 << (int) RID_LONG)
3515 || (specbits & 1 << (int) RID_SHORT))
3516 && TREE_CODE (type) == REAL_TYPE)
3518 static int already = 0;
3520 error ("long or short specified with floating type for `%s'", name);
3521 if (! already && ! pedantic)
3523 error ("the only valid combination is `long double'");
3527 else if ((specbits & 1 << (int) RID_SIGNED)
3528 && (specbits & 1 << (int) RID_UNSIGNED))
3529 error ("both signed and unsigned specified for `%s'", name);
3530 else if (TREE_CODE (type) != INTEGER_TYPE)
3531 error ("long, short, signed or unsigned invalid for `%s'", name);
3535 if (!explicit_int && !defaulted_int && !explicit_char)
3537 error ("long, short, signed or unsigned used invalidly for `%s'",
3543 /* Discard the type modifiers if they are invalid. */
3546 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3547 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3552 if ((specbits & (1 << (int) RID_COMPLEX))
3553 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3555 error ("complex invalid for `%s'", name);
3556 specbits &= ~(1 << (int) RID_COMPLEX);
3559 /* Decide whether an integer type is signed or not.
3560 Optionally treat bit-fields as signed by default. */
3561 if (specbits & 1 << (int) RID_UNSIGNED
3562 || (bitfield && ! flag_signed_bitfields
3563 && (explicit_int || defaulted_int || explicit_char
3564 /* A typedef for plain `int' without `signed'
3565 can be controlled just like plain `int'. */
3566 || ! (typedef_decl != 0
3567 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3568 && TREE_CODE (type) != ENUMERAL_TYPE
3569 && !(specbits & 1 << (int) RID_SIGNED)))
3572 type = long_long_unsigned_type_node;
3573 else if (specbits & 1 << (int) RID_LONG)
3574 type = long_unsigned_type_node;
3575 else if (specbits & 1 << (int) RID_SHORT)
3576 type = short_unsigned_type_node;
3577 else if (type == char_type_node)
3578 type = unsigned_char_type_node;
3579 else if (typedef_decl)
3580 type = c_common_unsigned_type (type);
3582 type = unsigned_type_node;
3584 else if ((specbits & 1 << (int) RID_SIGNED)
3585 && type == char_type_node)
3586 type = signed_char_type_node;
3588 type = long_long_integer_type_node;
3589 else if (specbits & 1 << (int) RID_LONG)
3590 type = long_integer_type_node;
3591 else if (specbits & 1 << (int) RID_SHORT)
3592 type = short_integer_type_node;
3594 if (specbits & 1 << (int) RID_COMPLEX)
3596 if (pedantic && !flag_isoc99)
3597 pedwarn ("ISO C90 does not support complex types");
3598 /* If we just have "complex", it is equivalent to
3599 "complex double", but if any modifiers at all are specified it is
3600 the complex form of TYPE. E.g, "complex short" is
3601 "complex short int". */
3603 if (defaulted_int && ! longlong
3604 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3605 | (1 << (int) RID_SIGNED)
3606 | (1 << (int) RID_UNSIGNED))))
3609 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3610 type = complex_double_type_node;
3612 else if (type == integer_type_node)
3615 pedwarn ("ISO C does not support complex integer types");
3616 type = complex_integer_type_node;
3618 else if (type == float_type_node)
3619 type = complex_float_type_node;
3620 else if (type == double_type_node)
3621 type = complex_double_type_node;
3622 else if (type == long_double_type_node)
3623 type = complex_long_double_type_node;
3627 pedwarn ("ISO C does not support complex integer types");
3628 type = build_complex_type (type);
3632 /* Figure out the type qualifiers for the declaration. There are
3633 two ways a declaration can become qualified. One is something
3634 like `const int i' where the `const' is explicit. Another is
3635 something like `typedef const int CI; CI i' where the type of the
3636 declaration contains the `const'. A third possibility is that
3637 there is a type qualifier on the element type of a typedefed
3638 array type, in which case we should extract that qualifier so
3639 that c_apply_type_quals_to_decls receives the full list of
3640 qualifiers to work with (C90 is not entirely clear about whether
3641 duplicate qualifiers should be diagnosed in this case, but it
3642 seems most appropriate to do so). */
3643 element_type = strip_array_types (type);
3644 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3646 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3648 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3649 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3650 if (pedantic && !flag_isoc99)
3653 pedwarn ("duplicate `const'");
3655 pedwarn ("duplicate `restrict'");
3657 pedwarn ("duplicate `volatile'");
3659 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3660 type = TYPE_MAIN_VARIANT (type);
3661 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3662 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3663 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3665 /* Warn if two storage classes are given. Default to `auto'. */
3670 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3671 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3672 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3673 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3674 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3676 /* "static __thread" and "extern __thread" are allowed. */
3677 if ((specbits & (1 << (int) RID_THREAD
3678 | 1 << (int) RID_STATIC
3679 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3682 /* Warn about storage classes that are invalid for certain
3683 kinds of declarations (parameters, typenames, etc.). */
3686 error ("multiple storage classes in declaration of `%s'", name);
3687 else if (funcdef_flag
3689 & ((1 << (int) RID_REGISTER)
3690 | (1 << (int) RID_AUTO)
3691 | (1 << (int) RID_TYPEDEF)
3692 | (1 << (int) RID_THREAD))))
3694 if (specbits & 1 << (int) RID_AUTO
3695 && (pedantic || current_scope == global_scope))
3696 pedwarn ("function definition declared `auto'");
3697 if (specbits & 1 << (int) RID_REGISTER)
3698 error ("function definition declared `register'");
3699 if (specbits & 1 << (int) RID_TYPEDEF)
3700 error ("function definition declared `typedef'");
3701 if (specbits & 1 << (int) RID_THREAD)
3702 error ("function definition declared `__thread'");
3703 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3704 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3706 else if (decl_context != NORMAL && nclasses > 0)
3708 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3712 switch (decl_context)
3715 error ("storage class specified for structure field `%s'",
3719 error ("storage class specified for parameter `%s'", name);
3722 error ("storage class specified for typename");
3725 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3726 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3727 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3730 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3732 /* `extern' with initialization is invalid if not at file scope. */
3733 if (current_scope == global_scope)
3734 warning ("`%s' initialized and declared `extern'", name);
3736 error ("`%s' has both `extern' and initializer", name);
3738 else if (current_scope == global_scope)
3740 if (specbits & 1 << (int) RID_AUTO)
3741 error ("file-scope declaration of `%s' specifies `auto'", name);
3745 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3746 error ("nested function `%s' declared `extern'", name);
3747 else if ((specbits & (1 << (int) RID_THREAD
3748 | 1 << (int) RID_EXTERN
3749 | 1 << (int) RID_STATIC))
3750 == (1 << (int) RID_THREAD))
3752 error ("function-scope `%s' implicitly auto and declared `__thread'",
3754 specbits &= ~(1 << (int) RID_THREAD);
3759 /* Now figure out the structure of the declarator proper.
3760 Descend through it, creating more complex types, until we reach
3761 the declared identifier (or NULL_TREE, in an absolute declarator). */
3763 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3765 if (type == error_mark_node)
3767 declarator = TREE_OPERAND (declarator, 0);
3771 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3772 an INDIRECT_REF (for *...),
3773 a CALL_EXPR (for ...(...)),
3774 a TREE_LIST (for nested attributes),
3775 an identifier (for the name being declared)
3776 or a null pointer (for the place in an absolute declarator
3777 where the name was omitted).
3778 For the last two cases, we have just exited the loop.
3780 At this point, TYPE is the type of elements of an array,
3781 or for a function to return, or for a pointer to point to.
3782 After this sequence of ifs, TYPE is the type of the
3783 array or function or pointer, and DECLARATOR has had its
3784 outermost layer removed. */
3786 if (array_ptr_quals != NULL_TREE || array_parm_static)
3788 /* Only the innermost declarator (making a parameter be of
3789 array type which is converted to pointer type)
3790 may have static or type qualifiers. */
3791 error ("static or type qualifiers in non-parameter array declarator");
3792 array_ptr_quals = NULL_TREE;
3793 array_parm_static = 0;
3796 if (TREE_CODE (declarator) == TREE_LIST)
3798 /* We encode a declarator with embedded attributes using
3800 tree attrs = TREE_PURPOSE (declarator);
3803 declarator = TREE_VALUE (declarator);
3804 inner_decl = declarator;
3805 while (inner_decl != NULL_TREE
3806 && TREE_CODE (inner_decl) == TREE_LIST)
3807 inner_decl = TREE_VALUE (inner_decl);
3808 if (inner_decl == NULL_TREE
3809 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3810 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3811 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3812 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3813 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3814 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3815 returned_attrs = decl_attributes (&type,
3816 chainon (returned_attrs, attrs),
3819 else if (TREE_CODE (declarator) == ARRAY_REF)
3821 tree itype = NULL_TREE;
3822 tree size = TREE_OPERAND (declarator, 1);
3823 /* The index is a signed object `sizetype' bits wide. */
3824 tree index_type = c_common_signed_type (sizetype);
3826 array_ptr_quals = TREE_TYPE (declarator);
3827 array_parm_static = TREE_STATIC (declarator);
3829 declarator = TREE_OPERAND (declarator, 0);
3831 /* Check for some types that there cannot be arrays of. */
3833 if (VOID_TYPE_P (type))
3835 error ("declaration of `%s' as array of voids", name);
3836 type = error_mark_node;
3839 if (TREE_CODE (type) == FUNCTION_TYPE)
3841 error ("declaration of `%s' as array of functions", name);
3842 type = error_mark_node;
3845 if (pedantic && !in_system_header && flexible_array_type_p (type))
3846 pedwarn ("invalid use of structure with flexible array member");
3848 if (size == error_mark_node)
3849 type = error_mark_node;
3851 if (type == error_mark_node)
3854 /* If size was specified, set ITYPE to a range-type for that size.
3855 Otherwise, ITYPE remains null. finish_decl may figure it out
3856 from an initial value. */
3860 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3861 STRIP_TYPE_NOPS (size);
3863 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3865 error ("size of array `%s' has non-integer type", name);
3866 size = integer_one_node;
3869 if (pedantic && integer_zerop (size))
3870 pedwarn ("ISO C forbids zero-size array `%s'", name);
3872 if (TREE_CODE (size) == INTEGER_CST)
3874 constant_expression_warning (size);
3875 if (tree_int_cst_sgn (size) < 0)
3877 error ("size of array `%s' is negative", name);
3878 size = integer_one_node;
3883 /* Make sure the array size remains visibly nonconstant
3884 even if it is (eg) a const variable with known value. */
3887 if (!flag_isoc99 && pedantic)
3889 if (TREE_CONSTANT (size))
3890 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3893 pedwarn ("ISO C90 forbids variable-size array `%s'",
3898 if (integer_zerop (size))
3900 /* A zero-length array cannot be represented with an
3901 unsigned index type, which is what we'll get with
3902 build_index_type. Create an open-ended range instead. */
3903 itype = build_range_type (sizetype, size, NULL_TREE);
3907 /* Compute the maximum valid index, that is, size - 1.
3908 Do the calculation in index_type, so that if it is
3909 a variable the computations will be done in the
3911 itype = fold (build (MINUS_EXPR, index_type,
3912 convert (index_type, size),
3913 convert (index_type, size_one_node)));
3915 /* If that overflowed, the array is too big.
3916 ??? While a size of INT_MAX+1 technically shouldn't
3917 cause an overflow (because we subtract 1), the overflow
3918 is recorded during the conversion to index_type, before
3919 the subtraction. Handling this case seems like an
3920 unnecessary complication. */
3921 if (TREE_OVERFLOW (itype))
3923 error ("size of array `%s' is too large", name);
3924 type = error_mark_node;
3930 /* We must be able to distinguish the
3931 SAVE_EXPR_CONTEXT for the variably-sized type
3932 so that we can set it correctly in
3933 set_save_expr_context. The convention is
3934 that all SAVE_EXPRs that need to be reset
3935 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3936 tree cfd = current_function_decl;
3937 if (decl_context == PARM)
3938 current_function_decl = NULL_TREE;
3939 itype = variable_size (itype);
3940 if (decl_context == PARM)
3941 current_function_decl = cfd;
3943 itype = build_index_type (itype);
3946 else if (decl_context == FIELD)
3948 if (pedantic && !flag_isoc99 && !in_system_header)
3949 pedwarn ("ISO C90 does not support flexible array members");
3951 /* ISO C99 Flexible array members are effectively identical
3952 to GCC's zero-length array extension. */
3953 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3956 /* If pedantic, complain about arrays of incomplete types. */
3958 if (pedantic && !COMPLETE_TYPE_P (type))
3959 pedwarn ("array type has incomplete element type");
3961 /* Build the array type itself, then merge any constancy or
3962 volatility into the target type. We must do it in this order
3963 to ensure that the TYPE_MAIN_VARIANT field of the array type
3964 is set correctly. */
3966 type = build_array_type (type, itype);
3968 type = c_build_qualified_type (type, type_quals);
3971 C_TYPE_VARIABLE_SIZE (type) = 1;
3973 /* The GCC extension for zero-length arrays differs from
3974 ISO flexible array members in that sizeof yields zero. */
3975 if (size && integer_zerop (size))
3978 TYPE_SIZE (type) = bitsize_zero_node;
3979 TYPE_SIZE_UNIT (type) = size_zero_node;
3981 if (decl_context != PARM
3982 && (array_ptr_quals != NULL_TREE || array_parm_static))
3984 error ("static or type qualifiers in non-parameter array declarator");
3985 array_ptr_quals = NULL_TREE;
3986 array_parm_static = 0;
3989 else if (TREE_CODE (declarator) == CALL_EXPR)
3991 /* Say it's a definition only for the declarator closest to
3992 the identifier, apart possibly from some attributes. */
3993 bool really_funcdef = false;
3997 tree t = TREE_OPERAND (declarator, 0);
3998 while (TREE_CODE (t) == TREE_LIST)
4000 really_funcdef = (TREE_CODE (t) == IDENTIFIER_NODE);
4003 /* Declaring a function type.
4004 Make sure we have a valid type for the function to return. */
4005 if (type == error_mark_node)
4010 /* Warn about some types functions can't return. */
4012 if (TREE_CODE (type) == FUNCTION_TYPE)
4014 error ("`%s' declared as function returning a function", name);
4015 type = integer_type_node;
4017 if (TREE_CODE (type) == ARRAY_TYPE)
4019 error ("`%s' declared as function returning an array", name);
4020 type = integer_type_node;
4023 /* Construct the function type and go to the next
4024 inner layer of declarator. */
4026 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4028 /* Type qualifiers before the return type of the function
4029 qualify the return type, not the function type. */
4032 /* Type qualifiers on a function return type are normally
4033 permitted by the standard but have no effect, so give a
4034 warning at -Wextra. Qualifiers on a void return type have
4035 meaning as a GNU extension, and are banned on function
4036 definitions in ISO C. FIXME: strictly we shouldn't
4037 pedwarn for qualified void return types except on function
4038 definitions, but not doing so could lead to the undesirable
4039 state of a "volatile void" function return type not being
4040 warned about, and a use of the function being compiled
4041 with GNU semantics, with no diagnostics under -pedantic. */
4042 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4043 pedwarn ("ISO C forbids qualified void function return type");
4044 else if (extra_warnings
4045 && !(VOID_TYPE_P (type)
4046 && type_quals == TYPE_QUAL_VOLATILE))
4047 warning ("type qualifiers ignored on function return type");
4049 type = c_build_qualified_type (type, type_quals);
4051 type_quals = TYPE_UNQUALIFIED;
4053 type = build_function_type (type, arg_types);
4054 declarator = TREE_OPERAND (declarator, 0);
4056 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4057 the formal parameter list of this FUNCTION_TYPE to point to
4058 the FUNCTION_TYPE node itself. */
4063 for (link = last_function_parm_tags;
4065 link = TREE_CHAIN (link))
4066 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4069 else if (TREE_CODE (declarator) == INDIRECT_REF)
4071 /* Merge any constancy or volatility into the target type
4074 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4076 pedwarn ("ISO C forbids qualified function types");
4078 type = c_build_qualified_type (type, type_quals);
4079 type_quals = TYPE_UNQUALIFIED;
4082 type = build_pointer_type (type);
4084 /* Process a list of type modifier keywords
4085 (such as const or volatile) that were given inside the `*'. */
4087 if (TREE_TYPE (declarator))
4095 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4096 typemodlist = TREE_CHAIN (typemodlist))
4098 tree qualifier = TREE_VALUE (typemodlist);
4100 if (C_IS_RESERVED_WORD (qualifier))
4102 if (C_RID_CODE (qualifier) == RID_CONST)
4104 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4106 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4116 error ("invalid type modifier within pointer declarator");
4117 if (pedantic && !flag_isoc99)
4120 pedwarn ("duplicate `const'");
4122 pedwarn ("duplicate `volatile'");
4124 pedwarn ("duplicate `restrict'");
4127 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4128 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4129 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4132 declarator = TREE_OPERAND (declarator, 0);
4139 /* Now TYPE has the actual type. */
4141 /* Check the type and width of a bit-field. */
4143 check_bitfield_type_and_width (&type, width, orig_name);
4145 /* Did array size calculations overflow? */
4147 if (TREE_CODE (type) == ARRAY_TYPE
4148 && COMPLETE_TYPE_P (type)
4149 && TREE_OVERFLOW (TYPE_SIZE (type)))
4151 error ("size of array `%s' is too large", name);
4152 /* If we proceed with the array type as it is, we'll eventually
4153 crash in tree_low_cst(). */
4154 type = error_mark_node;
4157 /* If this is declaring a typedef name, return a TYPE_DECL. */
4159 if (specbits & (1 << (int) RID_TYPEDEF))
4162 /* Note that the grammar rejects storage classes
4163 in typenames, fields or parameters */
4164 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4166 pedwarn ("ISO C forbids qualified function types");
4168 type = c_build_qualified_type (type, type_quals);
4169 decl = build_decl (TYPE_DECL, declarator, type);
4170 if ((specbits & (1 << (int) RID_SIGNED))
4171 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4172 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4173 decl_attributes (&decl, returned_attrs, 0);
4177 /* Detect the case of an array type of unspecified size
4178 which came, as such, direct from a typedef name.
4179 We must copy the type, so that each identifier gets
4180 a distinct type, so that each identifier's size can be
4181 controlled separately by its own initializer. */
4183 if (type != 0 && typedef_type != 0
4184 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4185 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4187 type = build_array_type (TREE_TYPE (type), 0);
4189 C_TYPE_VARIABLE_SIZE (type) = 1;
4192 /* If this is a type name (such as, in a cast or sizeof),
4193 compute the type and return it now. */
4195 if (decl_context == TYPENAME)
4197 /* Note that the grammar rejects storage classes
4198 in typenames, fields or parameters */
4199 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4201 pedwarn ("ISO C forbids const or volatile function types");
4203 type = c_build_qualified_type (type, type_quals);
4204 decl_attributes (&type, returned_attrs, 0);
4208 /* Aside from typedefs and type names (handle above),
4209 `void' at top level (not within pointer)
4210 is allowed only in public variables.
4211 We don't complain about parms either, but that is because
4212 a better error message can be made later. */
4214 if (VOID_TYPE_P (type) && decl_context != PARM
4215 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4216 && ((specbits & (1 << (int) RID_EXTERN))
4217 || (current_scope == global_scope
4219 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4221 error ("variable or field `%s' declared void", name);
4222 type = integer_type_node;
4225 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4226 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4231 if (decl_context == PARM)
4233 tree type_as_written;
4236 /* A parameter declared as an array of T is really a pointer to T.
4237 One declared as a function is really a pointer to a function. */
4239 if (TREE_CODE (type) == ARRAY_TYPE)
4241 /* Transfer const-ness of array into that of type pointed to. */
4242 type = TREE_TYPE (type);
4244 type = c_build_qualified_type (type, type_quals);
4245 type = build_pointer_type (type);
4246 type_quals = TYPE_UNQUALIFIED;
4247 if (array_ptr_quals)
4249 tree new_ptr_quals, new_ptr_attrs;
4251 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4252 /* We don't yet implement attributes in this context. */
4253 if (new_ptr_attrs != NULL_TREE)
4254 warning ("attributes in parameter array declarator ignored");
4259 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4261 tree qualifier = TREE_VALUE (new_ptr_quals);
4263 if (C_IS_RESERVED_WORD (qualifier))
4265 if (C_RID_CODE (qualifier) == RID_CONST)
4267 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4269 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4279 error ("invalid type modifier within array declarator");
4281 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4282 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4283 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4287 else if (TREE_CODE (type) == FUNCTION_TYPE)
4289 if (pedantic && type_quals)
4290 pedwarn ("ISO C forbids qualified function types");
4292 type = c_build_qualified_type (type, type_quals);
4293 type = build_pointer_type (type);
4294 type_quals = TYPE_UNQUALIFIED;
4296 else if (type_quals)
4297 type = c_build_qualified_type (type, type_quals);
4299 type_as_written = type;
4301 decl = build_decl (PARM_DECL, declarator, type);
4303 C_DECL_VARIABLE_SIZE (decl) = 1;
4305 /* Compute the type actually passed in the parmlist,
4306 for the case where there is no prototype.
4307 (For example, shorts and chars are passed as ints.)
4308 When there is a prototype, this is overridden later. */
4310 if (type == error_mark_node)
4311 promoted_type = type;
4313 promoted_type = c_type_promotes_to (type);
4315 DECL_ARG_TYPE (decl) = promoted_type;
4316 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4318 else if (decl_context == FIELD)
4320 /* Structure field. It may not be a function. */
4322 if (TREE_CODE (type) == FUNCTION_TYPE)
4324 error ("field `%s' declared as a function", name);
4325 type = build_pointer_type (type);
4327 else if (TREE_CODE (type) != ERROR_MARK
4328 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4330 error ("field `%s' has incomplete type", name);
4331 type = error_mark_node;
4333 /* Move type qualifiers down to element of an array. */
4334 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4335 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4337 TYPE_DOMAIN (type));
4338 decl = build_decl (FIELD_DECL, declarator, type);
4339 DECL_NONADDRESSABLE_P (decl) = bitfield;
4342 C_DECL_VARIABLE_SIZE (decl) = 1;
4344 else if (TREE_CODE (type) == FUNCTION_TYPE)
4346 /* Every function declaration is "external"
4347 except for those which are inside a function body
4348 in which `auto' is used.
4349 That is a case not specified by ANSI C,
4350 and we use it for forward declarations for nested functions. */
4351 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4352 || current_scope == global_scope);
4354 if (specbits & (1 << (int) RID_AUTO)
4355 && (pedantic || current_scope == global_scope))
4356 pedwarn ("invalid storage class for function `%s'", name);
4357 if (specbits & (1 << (int) RID_REGISTER))
4358 error ("invalid storage class for function `%s'", name);
4359 if (specbits & (1 << (int) RID_THREAD))
4360 error ("invalid storage class for function `%s'", name);
4361 /* Function declaration not at file scope.
4362 Storage classes other than `extern' are not allowed
4363 and `extern' makes no difference. */
4364 if (current_scope != global_scope
4365 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4367 pedwarn ("invalid storage class for function `%s'", name);
4369 decl = build_decl (FUNCTION_DECL, declarator, type);
4370 decl = build_decl_attribute_variant (decl, decl_attr);
4372 DECL_LANG_SPECIFIC (decl)
4373 = ggc_alloc_cleared (sizeof (struct lang_decl));
4375 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4376 pedwarn ("ISO C forbids qualified function types");
4378 /* GNU C interprets a `volatile void' return type to indicate
4379 that the function does not return. */
4380 if ((type_quals & TYPE_QUAL_VOLATILE)
4381 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4382 warning ("`noreturn' function returns non-void value");
4385 DECL_EXTERNAL (decl) = 1;
4386 /* Record absence of global scope for `static' or `auto'. */
4388 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4391 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4393 /* Record presence of `inline', if it is reasonable. */
4394 if (MAIN_NAME_P (declarator))
4397 warning ("cannot inline function `main'");
4401 /* Record that the function is declared `inline'. */
4402 DECL_DECLARED_INLINE_P (decl) = 1;
4404 /* Do not mark bare declarations as DECL_INLINE. Doing so
4405 in the presence of multiple declarations can result in
4406 the abstract origin pointing between the declarations,
4407 which will confuse dwarf2out. */
4410 DECL_INLINE (decl) = 1;
4411 if (specbits & (1 << (int) RID_EXTERN))
4412 current_extern_inline = 1;
4415 /* If -finline-functions, assume it can be inlined. This does
4416 two things: let the function be deferred until it is actually
4417 needed, and let dwarf2 know that the function is inlinable. */
4418 else if (flag_inline_trees == 2 && initialized)
4419 DECL_INLINE (decl) = 1;
4423 /* It's a variable. */
4424 /* An uninitialized decl with `extern' is a reference. */
4425 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4427 /* Move type qualifiers down to element of an array. */
4428 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4430 int saved_align = TYPE_ALIGN(type);
4431 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4433 TYPE_DOMAIN (type));
4434 TYPE_ALIGN (type) = saved_align;
4436 else if (type_quals)
4437 type = c_build_qualified_type (type, type_quals);
4439 /* It is invalid to create an `extern' declaration for a
4440 variable if there is a global declaration that is
4441 `static' and the global declaration is not visible. */
4442 if (extern_ref && current_scope != global_scope)
4446 global_decl = identifier_global_value (declarator);
4448 && TREE_CODE (global_decl) == VAR_DECL
4449 && lookup_name (declarator) != global_decl
4450 && !TREE_PUBLIC (global_decl))
4451 error ("variable previously declared `static' redeclared "
4455 decl = build_decl (VAR_DECL, declarator, type);
4457 C_DECL_VARIABLE_SIZE (decl) = 1;
4460 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4462 DECL_EXTERNAL (decl) = extern_ref;
4464 /* At file scope, the presence of a `static' or `register' storage
4465 class specifier, or the absence of all storage class specifiers
4466 makes this declaration a definition (perhaps tentative). Also,
4467 the absence of both `static' and `register' makes it public. */
4468 if (current_scope == global_scope)
4470 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4471 | (1 << (int) RID_REGISTER)));
4472 TREE_STATIC (decl) = !extern_ref;
4474 /* Not at file scope, only `static' makes a static definition. */
4477 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4478 TREE_PUBLIC (decl) = extern_ref;
4481 if (specbits & 1 << (int) RID_THREAD)
4483 if (targetm.have_tls)
4484 DECL_THREAD_LOCAL (decl) = 1;
4486 /* A mere warning is sure to result in improper semantics
4487 at runtime. Don't bother to allow this to compile. */
4488 error ("thread-local storage not supported for this target");
4492 /* Record `register' declaration for warnings on &
4493 and in case doing stupid register allocation. */
4495 if (specbits & (1 << (int) RID_REGISTER))
4496 DECL_REGISTER (decl) = 1;
4498 /* Record constancy and volatility. */
4499 c_apply_type_quals_to_decl (type_quals, decl);
4501 /* If a type has volatile components, it should be stored in memory.
4502 Otherwise, the fact that those components are volatile
4503 will be ignored, and would even crash the compiler. */
4504 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4505 c_mark_addressable (decl);
4507 #ifdef ENABLE_CHECKING
4508 /* This is the earliest point at which we might know the assembler
4509 name of a variable. Thus, if it's known before this, die horribly. */
4510 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4514 decl_attributes (&decl, returned_attrs, 0);
4520 /* Decode the parameter-list info for a function type or function definition.
4521 The argument is the value returned by `get_parm_info' (or made in parse.y
4522 if there is an identifier list instead of a parameter decl list).
4523 These two functions are separate because when a function returns
4524 or receives functions then each is called multiple times but the order
4525 of calls is different. The last call to `grokparms' is always the one
4526 that contains the formal parameter names of a function definition.
4528 Store in `last_function_parms' a chain of the decls of parms.
4529 Also store in `last_function_parm_tags' a chain of the struct, union,
4530 and enum tags declared among the parms.
4532 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4534 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4535 a mere declaration. A nonempty identifier-list gets an error message
4536 when FUNCDEF_FLAG is zero. */
4539 grokparms (tree parms_info, int funcdef_flag)
4541 tree first_parm = TREE_CHAIN (parms_info);
4543 last_function_parms = TREE_PURPOSE (parms_info);
4544 last_function_parm_tags = TREE_VALUE (parms_info);
4545 last_function_parm_others = TREE_TYPE (parms_info);
4547 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4548 && !in_system_header)
4549 warning ("function declaration isn't a prototype");
4552 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4555 pedwarn ("parameter names (without types) in function declaration");
4557 last_function_parms = first_parm;
4564 /* If the arg types are incomplete in a declaration,
4565 they must include undefined tags.
4566 These tags can never be defined in the scope of the declaration,
4567 so the types can never be completed,
4568 and no call can be compiled successfully. */
4570 for (parm = last_function_parms, typelt = first_parm;
4572 parm = TREE_CHAIN (parm))
4573 /* Skip over any enumeration constants declared here. */
4574 if (TREE_CODE (parm) == PARM_DECL)
4576 /* Barf if the parameter itself has an incomplete type. */
4577 tree type = TREE_VALUE (typelt);
4578 if (type == error_mark_node)
4580 if (!COMPLETE_TYPE_P (type))
4582 if (funcdef_flag && DECL_NAME (parm) != 0)
4583 error ("parameter `%s' has incomplete type",
4584 IDENTIFIER_POINTER (DECL_NAME (parm)));
4586 warning ("parameter has incomplete type");
4589 TREE_VALUE (typelt) = error_mark_node;
4590 TREE_TYPE (parm) = error_mark_node;
4593 typelt = TREE_CHAIN (typelt);
4600 /* Return a tree_list node with info on a parameter list just parsed.
4601 The TREE_PURPOSE is a list of decls of those parms.
4602 The TREE_VALUE is a list of structure, union and enum tags defined.
4603 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4604 The TREE_TYPE is a list of non-parameter decls which appeared with the
4606 This tree_list node is later fed to `grokparms'.
4608 VOID_AT_END nonzero means append `void' to the end of the type-list.
4609 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4612 get_parm_info (int void_at_end)
4614 tree decl, type, list;
4616 tree *last_type = &types;
4617 tree tags = current_scope->tags;
4618 tree parms = current_scope->parms;
4619 tree others = current_scope->names;
4620 static bool explained_incomplete_types = false;
4621 bool gave_void_only_once_err = false;
4623 /* Just "void" (and no ellipsis) is special. There are really no parms.
4624 But if the "void" is qualified (by "const" or "volatile"), or has a
4625 storage class specifier ("register"), then the behavior is undefined;
4626 issue an error. Typedefs for "void" are OK (see DR#157). */
4627 if (void_at_end && parms != 0
4628 && TREE_CHAIN (parms) == 0
4629 && VOID_TYPE_P (TREE_TYPE (parms))
4630 && !DECL_NAME (parms))
4632 if (TREE_THIS_VOLATILE (parms)
4633 || TREE_READONLY (parms)
4634 || DECL_REGISTER (parms))
4635 error ("\"void\" as only parameter may not be qualified");
4637 return tree_cons (0, 0, tree_cons (0, void_type_node, 0));
4640 /* Sanity check all of the parameter declarations. */
4641 for (decl = parms; decl; decl = TREE_CHAIN (decl))
4643 if (TREE_CODE (decl) != PARM_DECL)
4645 if (TREE_ASM_WRITTEN (decl))
4648 /* Since there is a prototype, args are passed in their
4649 declared types. The back end may override this. */
4650 type = TREE_TYPE (decl);
4651 DECL_ARG_TYPE (decl) = type;
4653 /* Check for (..., void, ...) and issue an error. */
4654 if (VOID_TYPE_P (type) && !DECL_NAME (decl) && !gave_void_only_once_err)
4656 error ("\"void\" must be the only parameter");
4657 gave_void_only_once_err = true;
4660 type = build_tree_list (0, type);
4662 last_type = &TREE_CHAIN (type);
4665 /* Check the list of non-parameter decls for any forward parm decls
4666 that never got real decls. */
4667 for (decl = others; decl; decl = TREE_CHAIN (decl))
4668 if (TREE_CODE (decl) == PARM_DECL)
4670 if (!TREE_ASM_WRITTEN (decl))
4673 error ("%Jparameter \"%D\" has just a forward declaration",
4677 /* Warn about any struct, union or enum tags defined within this
4678 list. The scope of such types is limited to this declaration,
4679 which is rarely if ever desirable (it's impossible to call such
4680 a function with type-correct arguments). */
4681 for (decl = tags; decl; decl = TREE_CHAIN (decl))
4683 enum tree_code code = TREE_CODE (TREE_VALUE (decl));
4684 const char *keyword;
4685 /* An anonymous union parm type is meaningful as a GNU extension.
4686 So don't warn for that. */
4687 if (code == UNION_TYPE && TREE_PURPOSE (decl) == 0 && !pedantic)
4690 /* The keyword should not be translated. */
4693 case RECORD_TYPE: keyword = "struct"; break;
4694 case UNION_TYPE: keyword = "union"; break;
4695 case ENUMERAL_TYPE: keyword = "enum"; break;
4699 if (TREE_PURPOSE (decl))
4700 /* The first %s will be one of 'struct', 'union', or 'enum'. */
4701 warning ("\"%s %s\" declared inside parameter list",
4702 keyword, IDENTIFIER_POINTER (TREE_PURPOSE (decl)));
4704 /* The %s will be one of 'struct', 'union', or 'enum'. */
4705 warning ("anonymous %s declared inside parameter list", keyword);
4707 if (! explained_incomplete_types)
4709 warning ("its scope is only this definition or declaration,"
4710 " which is probably not what you want");
4711 explained_incomplete_types = true;
4718 type = build_tree_list (0, void_type_node);
4722 list = tree_cons (parms, tags, types);
4723 TREE_TYPE (list) = others;
4727 /* Get the struct, enum or union (CODE says which) with tag NAME.
4728 Define the tag as a forward-reference if it is not defined. */
4731 xref_tag (enum tree_code code, tree name)
4733 /* If a cross reference is requested, look up the type
4734 already defined for this tag and return it. */
4736 tree ref = lookup_tag (code, name, 0);
4737 /* If this is the right type of tag, return what we found.
4738 (This reference will be shadowed by shadow_tag later if appropriate.)
4739 If this is the wrong type of tag, do not return it. If it was the
4740 wrong type in the same scope, we will have had an error
4741 message already; if in a different scope and declaring
4742 a name, pending_xref_error will give an error message; but if in a
4743 different scope and not declaring a name, this tag should
4744 shadow the previous declaration of a different type of tag, and
4745 this would not work properly if we return the reference found.
4746 (For example, with "struct foo" in an outer scope, "union foo;"
4747 must shadow that tag with a new one of union type.) */
4748 if (ref && TREE_CODE (ref) == code)
4751 /* If no such tag is yet defined, create a forward-reference node
4752 and record it as the "definition".
4753 When a real declaration of this type is found,
4754 the forward-reference will be altered into a real type. */
4756 ref = make_node (code);
4757 if (code == ENUMERAL_TYPE)
4759 /* Give the type a default layout like unsigned int
4760 to avoid crashing if it does not get defined. */
4761 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4762 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4763 TYPE_USER_ALIGN (ref) = 0;
4764 TREE_UNSIGNED (ref) = 1;
4765 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4766 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4767 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4770 pushtag (name, ref);
4775 /* Make sure that the tag NAME is defined *in the current scope*
4776 at least as a forward reference.
4777 CODE says which kind of tag NAME ought to be. */
4780 start_struct (enum tree_code code, tree name)
4782 /* If there is already a tag defined at this scope
4783 (as a forward reference), just return it. */
4788 ref = lookup_tag (code, name, 1);
4789 if (ref && TREE_CODE (ref) == code)
4791 if (TYPE_SIZE (ref))
4793 if (code == UNION_TYPE)
4794 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4796 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4798 else if (C_TYPE_BEING_DEFINED (ref))
4800 if (code == UNION_TYPE)
4801 error ("nested redefinition of `union %s'",
4802 IDENTIFIER_POINTER (name));
4804 error ("nested redefinition of `struct %s'",
4805 IDENTIFIER_POINTER (name));
4810 /* Otherwise create a forward-reference just so the tag is in scope. */
4812 ref = make_node (code);
4813 pushtag (name, ref);
4816 C_TYPE_BEING_DEFINED (ref) = 1;
4817 TYPE_PACKED (ref) = flag_pack_struct;
4821 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4822 of a structure component, returning a FIELD_DECL node.
4823 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4825 This is done during the parsing of the struct declaration.
4826 The FIELD_DECL nodes are chained together and the lot of them
4827 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4830 grokfield (tree declarator, tree declspecs, tree width)
4834 if (declarator == NULL_TREE && width == NULL_TREE)
4836 /* This is an unnamed decl.
4838 If we have something of the form "union { list } ;" then this
4839 is the anonymous union extension. Similarly for struct.
4841 If this is something of the form "struct foo;", then
4842 If MS extensions are enabled, this is handled as an
4844 Otherwise this is a forward declaration of a structure tag.
4846 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4847 If MS extensions are enabled and foo names a structure, then
4848 again this is an anonymous struct.
4849 Otherwise this is an error.
4851 Oh what a horrid tangled web we weave. I wonder if MS consciously
4852 took this from Plan 9 or if it was an accident of implementation
4853 that took root before someone noticed the bug... */
4855 tree type = TREE_VALUE (declspecs);
4857 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4858 type = TREE_TYPE (type);
4859 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4861 if (flag_ms_extensions)
4864 goto warn_unnamed_field;
4865 else if (TYPE_NAME (type) == NULL)
4868 goto warn_unnamed_field;
4873 warning ("declaration does not declare anything");
4878 value = grokdeclarator (declarator, declspecs, FIELD, 0,
4879 width ? &width : NULL);
4881 finish_decl (value, NULL_TREE, NULL_TREE);
4882 DECL_INITIAL (value) = width;
4887 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4888 the list such that this does not present a problem later. */
4891 detect_field_duplicates (tree fieldlist)
4896 /* First, see if there are more than "a few" fields.
4897 This is trivially true if there are zero or one fields. */
4900 x = TREE_CHAIN (fieldlist);
4906 } while (timeout > 0 && x);
4908 /* If there were "few" fields, avoid the overhead of allocating
4909 a hash table. Instead just do the nested traversal thing. */
4912 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4915 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4916 if (DECL_NAME (y) == DECL_NAME (x))
4918 error ("%Jduplicate member '%D'", x, x);
4919 DECL_NAME (x) = NULL_TREE;
4925 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4928 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4929 if ((y = DECL_NAME (x)) != 0)
4931 slot = htab_find_slot (htab, y, INSERT);
4934 error ("%Jduplicate member '%D'", x, x);
4935 DECL_NAME (x) = NULL_TREE;
4944 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4945 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4946 ATTRIBUTES are attributes to be applied to the structure. */
4949 finish_struct (tree t, tree fieldlist, tree attributes)
4952 int toplevel = global_scope == current_scope;
4953 int saw_named_field;
4955 /* If this type was previously laid out as a forward reference,
4956 make sure we lay it out again. */
4960 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4962 /* Nameless union parm types are useful as GCC extension. */
4963 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4964 /* Otherwise, warn about any struct or union def. in parmlist. */
4965 if (in_parm_level_p ())
4968 pedwarn ("%s defined inside parms",
4969 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4971 warning ("%s defined inside parms",
4972 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4977 for (x = fieldlist; x; x = TREE_CHAIN (x))
4978 if (DECL_NAME (x) != 0)
4982 pedwarn ("%s has no %s",
4983 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4984 fieldlist ? _("named members") : _("members"));
4987 /* Install struct as DECL_CONTEXT of each field decl.
4988 Also process specified field sizes,m which is found in the DECL_INITIAL.
4989 Store 0 there, except for ": 0" fields (so we can find them
4990 and delete them, below). */
4992 saw_named_field = 0;
4993 for (x = fieldlist; x; x = TREE_CHAIN (x))
4995 DECL_CONTEXT (x) = t;
4996 DECL_PACKED (x) |= TYPE_PACKED (t);
4998 /* If any field is const, the structure type is pseudo-const. */
4999 if (TREE_READONLY (x))
5000 C_TYPE_FIELDS_READONLY (t) = 1;
5003 /* A field that is pseudo-const makes the structure likewise. */
5004 tree t1 = TREE_TYPE (x);
5005 while (TREE_CODE (t1) == ARRAY_TYPE)
5006 t1 = TREE_TYPE (t1);
5007 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5008 && C_TYPE_FIELDS_READONLY (t1))
5009 C_TYPE_FIELDS_READONLY (t) = 1;
5012 /* Any field that is volatile means variables of this type must be
5013 treated in some ways as volatile. */
5014 if (TREE_THIS_VOLATILE (x))
5015 C_TYPE_FIELDS_VOLATILE (t) = 1;
5017 /* Any field of nominal variable size implies structure is too. */
5018 if (C_DECL_VARIABLE_SIZE (x))
5019 C_TYPE_VARIABLE_SIZE (t) = 1;
5021 if (DECL_INITIAL (x))
5023 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5024 DECL_SIZE (x) = bitsize_int (width);
5025 DECL_BIT_FIELD (x) = 1;
5026 SET_DECL_C_BIT_FIELD (x);
5029 DECL_INITIAL (x) = 0;
5031 /* Detect flexible array member in an invalid context. */
5032 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5033 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5034 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5035 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5037 if (TREE_CODE (t) == UNION_TYPE)
5039 error ("%Jflexible array member in union", x);
5040 TREE_TYPE (x) = error_mark_node;
5042 else if (TREE_CHAIN (x) != NULL_TREE)
5044 error ("%Jflexible array member not at end of struct", x);
5045 TREE_TYPE (x) = error_mark_node;
5047 else if (! saw_named_field)
5049 error ("%Jflexible array member in otherwise empty struct", x);
5050 TREE_TYPE (x) = error_mark_node;
5054 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5055 && flexible_array_type_p (TREE_TYPE (x)))
5056 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5059 saw_named_field = 1;
5062 detect_field_duplicates (fieldlist);
5064 /* Now we have the nearly final fieldlist. Record it,
5065 then lay out the structure or union (including the fields). */
5067 TYPE_FIELDS (t) = fieldlist;
5071 /* Delete all zero-width bit-fields from the fieldlist. */
5073 tree *fieldlistp = &fieldlist;
5075 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5076 *fieldlistp = TREE_CHAIN (*fieldlistp);
5078 fieldlistp = &TREE_CHAIN (*fieldlistp);
5081 /* Now we have the truly final field list.
5082 Store it in this type and in the variants. */
5084 TYPE_FIELDS (t) = fieldlist;
5086 /* If there are lots of fields, sort so we can look through them fast.
5087 We arbitrarily consider 16 or more elts to be "a lot". */
5092 for (x = fieldlist; x; x = TREE_CHAIN (x))
5094 if (len > 15 || DECL_NAME (x) == NULL)
5102 struct lang_type *space;
5103 struct sorted_fields_type *space2;
5105 len += list_length (x);
5107 /* Use the same allocation policy here that make_node uses, to
5108 ensure that this lives as long as the rest of the struct decl.
5109 All decls in an inline function need to be saved. */
5111 space = ggc_alloc (sizeof (struct lang_type));
5112 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5116 field_array = &space2->elts[0];
5117 for (x = fieldlist; x; x = TREE_CHAIN (x))
5119 field_array[len++] = x;
5121 /* If there is anonymous struct or union, break out of the loop. */
5122 if (DECL_NAME (x) == NULL)
5125 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5128 TYPE_LANG_SPECIFIC (t) = space;
5129 TYPE_LANG_SPECIFIC (t)->s->len = len;
5130 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5131 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5136 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5138 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5139 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5140 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5141 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5142 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5143 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5144 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5147 /* If this was supposed to be a transparent union, but we can't
5148 make it one, warn and turn off the flag. */
5149 if (TREE_CODE (t) == UNION_TYPE
5150 && TYPE_TRANSPARENT_UNION (t)
5151 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5153 TYPE_TRANSPARENT_UNION (t) = 0;
5154 warning ("union cannot be made transparent");
5157 /* If this structure or union completes the type of any previous
5158 variable declaration, lay it out and output its rtl. */
5159 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5163 tree decl = TREE_VALUE (x);
5164 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5165 layout_array_type (TREE_TYPE (decl));
5166 if (TREE_CODE (decl) != TYPE_DECL)
5168 layout_decl (decl, 0);
5169 if (c_dialect_objc ())
5170 objc_check_decl (decl);
5171 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5176 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5178 /* Finish debugging output for this type. */
5179 rest_of_type_compilation (t, toplevel);
5184 /* Lay out the type T, and its element type, and so on. */
5187 layout_array_type (tree t)
5189 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5190 layout_array_type (TREE_TYPE (t));
5194 /* Begin compiling the definition of an enumeration type.
5195 NAME is its name (or null if anonymous).
5196 Returns the type object, as yet incomplete.
5197 Also records info about it so that build_enumerator
5198 may be used to declare the individual values as they are read. */
5201 start_enum (tree name)
5205 /* If this is the real definition for a previous forward reference,
5206 fill in the contents in the same object that used to be the
5207 forward reference. */
5210 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5212 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5214 enumtype = make_node (ENUMERAL_TYPE);
5215 pushtag (name, enumtype);
5218 if (C_TYPE_BEING_DEFINED (enumtype))
5219 error ("nested redefinition of `enum %s'", IDENTIFIER_POINTER (name));
5221 C_TYPE_BEING_DEFINED (enumtype) = 1;
5223 if (TYPE_VALUES (enumtype) != 0)
5225 /* This enum is a named one that has been declared already. */
5226 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5228 /* Completely replace its old definition.
5229 The old enumerators remain defined, however. */
5230 TYPE_VALUES (enumtype) = 0;
5233 enum_next_value = integer_zero_node;
5236 if (flag_short_enums)
5237 TYPE_PACKED (enumtype) = 1;
5242 /* After processing and defining all the values of an enumeration type,
5243 install their decls in the enumeration type and finish it off.
5244 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5245 and ATTRIBUTES are the specified attributes.
5246 Returns ENUMTYPE. */
5249 finish_enum (tree enumtype, tree values, tree attributes)
5252 tree minnode = 0, maxnode = 0, enum_value_type;
5253 int precision, unsign;
5254 int toplevel = (global_scope == current_scope);
5256 if (in_parm_level_p ())
5257 warning ("enum defined inside parms");
5259 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5261 /* Calculate the maximum value of any enumerator in this type. */
5263 if (values == error_mark_node)
5264 minnode = maxnode = integer_zero_node;
5267 minnode = maxnode = TREE_VALUE (values);
5268 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5270 tree value = TREE_VALUE (pair);
5271 if (tree_int_cst_lt (maxnode, value))
5273 if (tree_int_cst_lt (value, minnode))
5278 /* Construct the final type of this enumeration. It is the same
5279 as one of the integral types - the narrowest one that fits, except
5280 that normally we only go as narrow as int - and signed iff any of
5281 the values are negative. */
5282 unsign = (tree_int_cst_sgn (minnode) >= 0);
5283 precision = MAX (min_precision (minnode, unsign),
5284 min_precision (maxnode, unsign));
5285 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5287 tree narrowest = c_common_type_for_size (precision, unsign);
5290 warning ("enumeration values exceed range of largest integer");
5291 narrowest = long_long_integer_type_node;
5294 precision = TYPE_PRECISION (narrowest);
5297 precision = TYPE_PRECISION (integer_type_node);
5299 if (precision == TYPE_PRECISION (integer_type_node))
5300 enum_value_type = c_common_type_for_size (precision, 0);
5302 enum_value_type = enumtype;
5304 TYPE_MIN_VALUE (enumtype) = minnode;
5305 TYPE_MAX_VALUE (enumtype) = maxnode;
5306 TREE_UNSIGNED (enumtype) = unsign;
5307 TYPE_SIZE (enumtype) = 0;
5309 /* If the precision of the type was specific with an attribute and it
5310 was too small, give an error. Otherwise, use it. */
5311 if (TYPE_PRECISION (enumtype))
5313 if (precision > TYPE_PRECISION (enumtype))
5314 error ("specified mode too small for enumeral values");
5317 TYPE_PRECISION (enumtype) = precision;
5319 layout_type (enumtype);
5321 if (values != error_mark_node)
5323 /* Change the type of the enumerators to be the enum type. We
5324 need to do this irrespective of the size of the enum, for
5325 proper type checking. Replace the DECL_INITIALs of the
5326 enumerators, and the value slots of the list, with copies
5327 that have the enum type; they cannot be modified in place
5328 because they may be shared (e.g. integer_zero_node) Finally,
5329 change the purpose slots to point to the names of the decls. */
5330 for (pair = values; pair; pair = TREE_CHAIN (pair))
5332 tree enu = TREE_PURPOSE (pair);
5334 TREE_TYPE (enu) = enumtype;
5336 /* The ISO C Standard mandates enumerators to have type int,
5337 even though the underlying type of an enum type is
5338 unspecified. Here we convert any enumerators that fit in
5339 an int to type int, to avoid promotions to unsigned types
5340 when comparing integers with enumerators that fit in the
5341 int range. When -pedantic is given, build_enumerator()
5342 would have already taken care of those that don't fit. */
5343 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5344 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5346 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5348 TREE_PURPOSE (pair) = DECL_NAME (enu);
5349 TREE_VALUE (pair) = DECL_INITIAL (enu);
5352 TYPE_VALUES (enumtype) = values;
5355 /* Fix up all variant types of this enum type. */
5356 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5358 if (tem == enumtype)
5360 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5361 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5362 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5363 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5364 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5365 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5366 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5367 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5368 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5369 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5372 /* Finish debugging output for this type. */
5373 rest_of_type_compilation (enumtype, toplevel);
5378 /* Build and install a CONST_DECL for one value of the
5379 current enumeration type (one that was begun with start_enum).
5380 Return a tree-list containing the CONST_DECL and its value.
5381 Assignment of sequential values by default is handled here. */
5384 build_enumerator (tree name, tree value)
5388 /* Validate and default VALUE. */
5390 /* Remove no-op casts from the value. */
5392 STRIP_TYPE_NOPS (value);
5396 if (TREE_CODE (value) == INTEGER_CST)
5398 value = default_conversion (value);
5399 constant_expression_warning (value);
5403 error ("enumerator value for `%s' not integer constant",
5404 IDENTIFIER_POINTER (name));
5409 /* Default based on previous value. */
5410 /* It should no longer be possible to have NON_LVALUE_EXPR
5414 value = enum_next_value;
5416 error ("overflow in enumeration values");
5419 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5421 pedwarn ("ISO C restricts enumerator values to range of `int'");
5422 value = convert (integer_type_node, value);
5425 /* Set basis for default for next value. */
5426 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5427 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5429 /* Now create a declaration for the enum value name. */
5431 type = TREE_TYPE (value);
5432 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5433 TYPE_PRECISION (integer_type_node)),
5434 (TYPE_PRECISION (type)
5435 >= TYPE_PRECISION (integer_type_node)
5436 && TREE_UNSIGNED (type)));
5438 decl = build_decl (CONST_DECL, name, type);
5439 DECL_INITIAL (decl) = convert (type, value);
5442 return tree_cons (decl, value, NULL_TREE);
5446 /* Create the FUNCTION_DECL for a function definition.
5447 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5448 the declaration; they describe the function's name and the type it returns,
5449 but twisted together in a fashion that parallels the syntax of C.
5451 This function creates a binding context for the function body
5452 as well as setting up the FUNCTION_DECL in current_function_decl.
5454 Returns 1 on success. If the DECLARATOR is not suitable for a function
5455 (it defines a datum instead), we return 0, which tells
5456 yyparse to report a parse error. */
5459 start_function (tree declspecs, tree declarator, tree attributes)
5461 tree decl1, old_decl;
5463 int old_immediate_size_expand = immediate_size_expand;
5465 current_function_returns_value = 0; /* Assume, until we see it does. */
5466 current_function_returns_null = 0;
5467 current_function_returns_abnormally = 0;
5468 warn_about_return_type = 0;
5469 current_extern_inline = 0;
5470 c_in_iteration_stmt = 0;
5473 /* Don't expand any sizes in the return type of the function. */
5474 immediate_size_expand = 0;
5476 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, NULL);
5478 /* If the declarator is not suitable for a function definition,
5479 cause a syntax error. */
5482 immediate_size_expand = old_immediate_size_expand;
5486 decl_attributes (&decl1, attributes, 0);
5488 if (DECL_DECLARED_INLINE_P (decl1)
5489 && DECL_UNINLINABLE (decl1)
5490 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5491 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5493 announce_function (decl1);
5495 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5497 error ("return type is an incomplete type");
5498 /* Make it return void instead. */
5500 = build_function_type (void_type_node,
5501 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5504 if (warn_about_return_type)
5505 pedwarn_c99 ("return type defaults to `int'");
5507 /* Save the parm names or decls from this function's declarator
5508 where store_parm_decls will find them. */
5509 current_function_parms = last_function_parms;
5510 current_function_parm_tags = last_function_parm_tags;
5511 current_function_parm_others = last_function_parm_others;
5513 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5514 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5515 DECL_INITIAL (decl1) = error_mark_node;
5517 /* If this definition isn't a prototype and we had a prototype declaration
5518 before, copy the arg type info from that prototype.
5519 But not if what we had before was a builtin function. */
5520 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5521 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5522 && !DECL_BUILT_IN (old_decl)
5523 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5524 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5525 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5527 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5528 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5531 /* Optionally warn of old-fashioned def with no previous prototype. */
5532 if (warn_strict_prototypes
5533 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5534 && C_DECL_ISNT_PROTOTYPE (old_decl))
5535 warning ("function declaration isn't a prototype");
5536 /* Optionally warn of any global def with no previous prototype. */
5537 else if (warn_missing_prototypes
5538 && TREE_PUBLIC (decl1)
5539 && ! MAIN_NAME_P (DECL_NAME (decl1))
5540 && C_DECL_ISNT_PROTOTYPE (old_decl))
5541 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5542 /* Optionally warn of any def with no previous prototype
5543 if the function has already been used. */
5544 else if (warn_missing_prototypes
5545 && old_decl != 0 && TREE_USED (old_decl)
5546 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5547 warning ("%J'%D' was used with no prototype before its definition",
5549 /* Optionally warn of any global def with no previous declaration. */
5550 else if (warn_missing_declarations
5551 && TREE_PUBLIC (decl1)
5553 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5554 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5555 /* Optionally warn of any def with no previous declaration
5556 if the function has already been used. */
5557 else if (warn_missing_declarations
5558 && old_decl != 0 && TREE_USED (old_decl)
5559 && C_DECL_IMPLICIT (old_decl))
5560 warning ("%J`%D' was used with no declaration before its definition",
5563 /* This is a definition, not a reference.
5564 So normally clear DECL_EXTERNAL.
5565 However, `extern inline' acts like a declaration
5566 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5567 DECL_EXTERNAL (decl1) = current_extern_inline;
5569 /* This function exists in static storage.
5570 (This does not mean `static' in the C sense!) */
5571 TREE_STATIC (decl1) = 1;
5573 /* A nested function is not global. */
5574 if (current_function_decl != 0)
5575 TREE_PUBLIC (decl1) = 0;
5577 #ifdef ENABLE_CHECKING
5578 /* This is the earliest point at which we might know the assembler
5579 name of the function. Thus, if it's set before this, die horribly. */
5580 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5584 /* If #pragma weak was used, mark the decl weak now. */
5585 if (current_scope == global_scope)
5586 maybe_apply_pragma_weak (decl1);
5588 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5589 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5594 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5595 != integer_type_node)
5596 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5598 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5599 args = TREE_CHAIN (args))
5601 tree type = args ? TREE_VALUE (args) : 0;
5603 if (type == void_type_node)
5610 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5611 pedwarn ("%Jfirst argument of '%D' should be `int'",
5616 if (TREE_CODE (type) != POINTER_TYPE
5617 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5618 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5620 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5625 if (TREE_CODE (type) != POINTER_TYPE
5626 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5627 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5629 pedwarn ("%Jthird argument of '%D' should probably be "
5630 "'char **'", decl1, decl1);
5635 /* It is intentional that this message does not mention the third
5636 argument because it's only mentioned in an appendix of the
5638 if (argct > 0 && (argct < 2 || argct > 3))
5639 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5641 if (! TREE_PUBLIC (decl1))
5642 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5645 /* Record the decl so that the function name is defined.
5646 If we already have a decl for this name, and it is a FUNCTION_DECL,
5647 use the old decl. */
5649 current_function_decl = pushdecl (decl1);
5652 declare_parm_level ();
5654 make_decl_rtl (current_function_decl, NULL);
5656 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5657 /* Promote the value to int before returning it. */
5658 if (c_promoting_integer_type_p (restype))
5660 /* It retains unsignedness if not really getting wider. */
5661 if (TREE_UNSIGNED (restype)
5662 && (TYPE_PRECISION (restype)
5663 == TYPE_PRECISION (integer_type_node)))
5664 restype = unsigned_type_node;
5666 restype = integer_type_node;
5668 DECL_RESULT (current_function_decl)
5669 = build_decl (RESULT_DECL, NULL_TREE, restype);
5671 /* If this fcn was already referenced via a block-scope `extern' decl
5672 (or an implicit decl), propagate certain information about the usage. */
5673 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5674 TREE_ADDRESSABLE (current_function_decl) = 1;
5676 immediate_size_expand = old_immediate_size_expand;
5678 start_fname_decls ();
5683 /* Subroutine of store_parm_decls which handles new-style function
5684 definitions (prototype format). The parms already have decls, so we
5685 need only record them as in effect and complain if any redundant
5686 old-style parm decls were written. */
5688 store_parm_decls_newstyle (void)
5691 tree fndecl = current_function_decl;
5692 tree parms = current_function_parms;
5693 tree tags = current_function_parm_tags;
5694 tree others = current_function_parm_others;
5696 if (current_scope->parms || current_scope->names || current_scope->tags)
5698 error ("%Jold-style parameter declarations in prototyped "
5699 "function definition", fndecl);
5701 /* Get rid of the old-style declarations. */
5706 /* Now make all the parameter declarations visible in the function body.
5707 We can bypass most of the grunt work of pushdecl. */
5708 for (last = 0, decl = parms; decl; last = decl, decl = TREE_CHAIN (decl))
5710 DECL_CONTEXT (decl) = current_function_decl;
5711 if (DECL_NAME (decl) == 0)
5712 error ("%Jparameter name omitted", decl);
5715 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5716 current_scope->shadowed
5717 = tree_cons (DECL_NAME (decl),
5718 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5719 current_scope->shadowed);
5720 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5723 current_scope->parms = parms;
5724 current_scope->parms_last = last;
5726 /* Record the parameter list in the function declaration. */
5727 DECL_ARGUMENTS (fndecl) = parms;
5729 /* Now make all the ancillary declarations visible, likewise. */
5730 for (last = 0, decl = others; decl; last = decl, decl = TREE_CHAIN (decl))
5732 DECL_CONTEXT (decl) = current_function_decl;
5733 if (DECL_NAME (decl)
5734 && TYPE_MAIN_VARIANT (TREE_TYPE (decl)) != void_type_node)
5736 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5737 current_scope->shadowed
5738 = tree_cons (DECL_NAME (decl),
5739 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5740 current_scope->shadowed);
5741 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5744 current_scope->names = others;
5745 current_scope->names_last = last;
5747 /* And all the tag declarations. */
5748 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5749 if (TREE_PURPOSE (decl))
5751 if (IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)))
5752 current_scope->shadowed_tags
5753 = tree_cons (TREE_PURPOSE (decl),
5754 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (decl)),
5755 current_scope->shadowed_tags);
5756 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)) = TREE_VALUE (decl);
5758 current_scope->tags = tags;
5761 /* Subroutine of store_parm_decls which handles old-style function
5762 definitions (separate parameter list and declarations). */
5765 store_parm_decls_oldstyle (void)
5767 tree parm, decl, last;
5768 tree fndecl = current_function_decl;
5770 /* This is the identifier list from the function declarator. */
5771 tree parmids = current_function_parms;
5773 /* We use DECL_WEAK as a flag to show which parameters have been
5774 seen already, since it is not used on PARM_DECL. */
5775 #ifdef ENABLE_CHECKING
5776 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5777 if (DECL_WEAK (parm))
5781 /* Match each formal parameter name with its declaration. Save each
5782 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5783 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5785 if (TREE_VALUE (parm) == 0)
5787 error ("%Jparameter name missing from parameter list", fndecl);
5788 TREE_PURPOSE (parm) = 0;
5792 decl = IDENTIFIER_SYMBOL_VALUE (TREE_VALUE (parm));
5793 if (decl && DECL_CONTEXT (decl) == fndecl)
5795 /* If we got something other than a PARM_DECL it is an error. */
5796 if (TREE_CODE (decl) != PARM_DECL)
5797 error ("%J\"%D\" declared as a non-parameter", decl, decl);
5798 /* If the declaration is already marked, we have a duplicate
5799 name. Complain and ignore the duplicate. */
5800 else if (DECL_WEAK (decl))
5802 error ("%Jmultiple parameters named \"%D\"", decl, decl);
5803 TREE_PURPOSE (parm) = 0;
5806 /* If the declaration says "void", complain and turn it into
5808 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5810 error ("%Jparameter \"%D\" declared void", decl, decl);
5811 TREE_TYPE (decl) = integer_type_node;
5812 DECL_ARG_TYPE (decl) = integer_type_node;
5813 layout_decl (decl, 0);
5816 /* If no declaration found, default to int. */
5819 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5820 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5821 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5825 pedwarn ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5826 else if (extra_warnings)
5827 warning ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5830 TREE_PURPOSE (parm) = decl;
5831 DECL_WEAK (decl) = 1;
5834 /* Now examine the parms chain for incomplete declarations
5835 and declarations with no corresponding names. */
5837 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5839 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5841 error ("%Jparameter \"%D\" has incomplete type", parm, parm);
5842 TREE_TYPE (parm) = error_mark_node;
5845 if (! DECL_WEAK (parm))
5847 error ("%Jdeclaration for parameter \"%D\" but no such parameter",
5850 /* Pretend the parameter was not missing.
5851 This gets us to a standard state and minimizes
5852 further error messages. */
5853 parmids = chainon (parmids, tree_cons (parm, 0, 0));
5857 /* Chain the declarations together in the order of the list of
5858 names. Store that chain in the function decl, replacing the
5859 list of names. Update the current scope to match. */
5860 DECL_ARGUMENTS (fndecl) = 0;
5862 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5863 if (TREE_PURPOSE (parm))
5865 if (parm && TREE_PURPOSE (parm))
5867 last = TREE_PURPOSE (parm);
5868 DECL_ARGUMENTS (fndecl) = last;
5869 current_scope->parms = last;
5870 DECL_WEAK (last) = 0;
5872 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
5873 if (TREE_PURPOSE (parm))
5875 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5876 last = TREE_PURPOSE (parm);
5877 DECL_WEAK (last) = 0;
5879 current_scope->parms_last = last;
5880 TREE_CHAIN (last) = 0;
5883 /* If there was a previous prototype,
5884 set the DECL_ARG_TYPE of each argument according to
5885 the type previously specified, and report any mismatches. */
5887 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5890 for (parm = DECL_ARGUMENTS (fndecl),
5891 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5892 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5893 != void_type_node));
5894 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5896 if (parm == 0 || type == 0
5897 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5899 error ("number of arguments doesn't match prototype");
5900 error ("%Hprototype declaration",
5901 ¤t_function_prototype_locus);
5904 /* Type for passing arg must be consistent with that
5905 declared for the arg. ISO C says we take the unqualified
5906 type for parameters declared with qualified type. */
5907 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5908 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
5911 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5912 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5914 /* Adjust argument to match prototype. E.g. a previous
5915 `int foo(float);' prototype causes
5916 `int foo(x) float x; {...}' to be treated like
5917 `int foo(float x) {...}'. This is particularly
5918 useful for argument types like uid_t. */
5919 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5921 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
5922 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5923 && TYPE_PRECISION (TREE_TYPE (parm))
5924 < TYPE_PRECISION (integer_type_node))
5925 DECL_ARG_TYPE (parm) = integer_type_node;
5929 pedwarn ("promoted argument \"%D\" "
5930 "doesn't match prototype", parm);
5931 pedwarn ("%Hprototype declaration",
5932 ¤t_function_prototype_locus);
5937 error ("argument \"%D\" doesn't match prototype", parm);
5938 error ("%Hprototype declaration",
5939 ¤t_function_prototype_locus);
5943 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5946 /* Otherwise, create a prototype that would match. */
5950 tree actual = 0, last = 0, type;
5952 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5954 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
5956 TREE_CHAIN (last) = type;
5961 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5963 TREE_CHAIN (last) = type;
5967 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5968 of the type of this function, but we need to avoid having this
5969 affect the types of other similarly-typed functions, so we must
5970 first force the generation of an identical (but separate) type
5971 node for the relevant function type. The new node we create
5972 will be a variant of the main variant of the original function
5975 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5977 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5981 /* Store the parameter declarations into the current function declaration.
5982 This is called after parsing the parameter declarations, before
5983 digesting the body of the function.
5985 For an old-style definition, construct a prototype out of the old-style
5986 parameter declarations and inject it into the function's type. */
5989 store_parm_decls (void)
5991 tree fndecl = current_function_decl;
5993 /* The function containing FNDECL, if any. */
5994 tree context = decl_function_context (fndecl);
5996 /* True if this definition is written with a prototype. */
5997 bool prototype = (current_function_parms
5998 && TREE_CODE (current_function_parms) != TREE_LIST);
6001 store_parm_decls_newstyle ();
6003 store_parm_decls_oldstyle ();
6005 /* The next call to pushlevel will be a function body. */
6007 next_is_function_body = true;
6009 /* Write a record describing this function definition to the prototypes
6010 file (if requested). */
6012 gen_aux_info_record (fndecl, 1, 0, prototype);
6014 /* Initialize the RTL code for the function. */
6015 allocate_struct_function (fndecl);
6017 /* Begin the statement tree for this function. */
6018 begin_stmt_tree (&DECL_SAVED_TREE (fndecl));
6020 /* If this is a nested function, save away the sizes of any
6021 variable-size types so that we can expand them when generating
6027 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6028 = nreverse (get_pending_sizes ());
6029 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6032 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
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)
6185 /* Make sure that we will evaluate variable-sized types involved
6186 in our function's type. */
6187 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6189 /* Squirrel away our current state. */
6190 push_function_context ();
6193 tree_rest_of_compilation (fndecl, nested_p);
6196 /* Return to the enclosing function. */
6197 pop_function_context ();
6199 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6201 if (targetm.have_ctors_dtors)
6202 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6203 DEFAULT_INIT_PRIORITY);
6205 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6208 if (DECL_STATIC_DESTRUCTOR (fndecl))
6210 if (targetm.have_ctors_dtors)
6211 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6212 DEFAULT_INIT_PRIORITY);
6214 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6218 /* Like c_expand_body_1 but only for unnested functions. */
6221 c_expand_body (tree fndecl)
6224 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6225 c_expand_body_1 (fndecl, 0);
6228 /* Check the declarations given in a for-loop for satisfying the C99
6231 check_for_loop_decls (void)
6237 /* If we get here, declarations have been used in a for loop without
6238 the C99 for loop scope. This doesn't make much sense, so don't
6240 error ("'for' loop initial declaration used outside C99 mode");
6243 /* C99 subclause 6.8.5 paragraph 3:
6245 [#3] The declaration part of a for statement shall only
6246 declare identifiers for objects having storage class auto or
6249 It isn't clear whether, in this sentence, "identifiers" binds to
6250 "shall only declare" or to "objects" - that is, whether all identifiers
6251 declared must be identifiers for objects, or whether the restriction
6252 only applies to those that are. (A question on this in comp.std.c
6253 in November 2000 received no answer.) We implement the strictest
6254 interpretation, to avoid creating an extension which later causes
6257 for (t = current_scope->tags; t; t = TREE_CHAIN (t))
6259 if (TREE_PURPOSE (t) != 0)
6261 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6263 if (code == RECORD_TYPE)
6264 error ("'struct %s' declared in 'for' loop initial declaration",
6265 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6266 else if (code == UNION_TYPE)
6267 error ("'union %s' declared in 'for' loop initial declaration",
6268 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6270 error ("'enum %s' declared in 'for' loop initial declaration",
6271 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6275 for (t = getdecls (); t; t = TREE_CHAIN (t))
6277 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6278 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6279 "initial declaration", t, t);
6280 else if (TREE_STATIC (t))
6281 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6282 "initial declaration", t, t);
6283 else if (DECL_EXTERNAL (t))
6284 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6285 "initial declaration", t, t);
6289 /* Save and reinitialize the variables
6290 used during compilation of a C function. */
6293 c_push_function_context (struct function *f)
6295 struct language_function *p;
6296 p = ggc_alloc (sizeof (struct language_function));
6299 p->base.x_stmt_tree = c_stmt_tree;
6300 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6301 p->x_in_iteration_stmt = c_in_iteration_stmt;
6302 p->x_in_case_stmt = c_in_case_stmt;
6303 p->returns_value = current_function_returns_value;
6304 p->returns_null = current_function_returns_null;
6305 p->returns_abnormally = current_function_returns_abnormally;
6306 p->warn_about_return_type = warn_about_return_type;
6307 p->extern_inline = current_extern_inline;
6310 /* Restore the variables used during compilation of a C function. */
6313 c_pop_function_context (struct function *f)
6315 struct language_function *p = f->language;
6317 if (DECL_SAVED_INSNS (current_function_decl) == 0
6318 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6320 /* Stop pointing to the local nodes about to be freed. */
6321 /* But DECL_INITIAL must remain nonzero so we know this
6322 was an actual function definition. */
6323 DECL_INITIAL (current_function_decl) = error_mark_node;
6324 DECL_ARGUMENTS (current_function_decl) = 0;
6327 c_stmt_tree = p->base.x_stmt_tree;
6328 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6329 c_in_iteration_stmt = p->x_in_iteration_stmt;
6330 c_in_case_stmt = p->x_in_case_stmt;
6331 current_function_returns_value = p->returns_value;
6332 current_function_returns_null = p->returns_null;
6333 current_function_returns_abnormally = p->returns_abnormally;
6334 warn_about_return_type = p->warn_about_return_type;
6335 current_extern_inline = p->extern_inline;
6340 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6343 c_dup_lang_specific_decl (tree decl)
6345 struct lang_decl *ld;
6347 if (!DECL_LANG_SPECIFIC (decl))
6350 ld = ggc_alloc (sizeof (struct lang_decl));
6351 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6352 DECL_LANG_SPECIFIC (decl) = ld;
6355 /* The functions below are required for functionality of doing
6356 function at once processing in the C front end. Currently these
6357 functions are not called from anywhere in the C front end, but as
6358 these changes continue, that will change. */
6360 /* Returns nonzero if the current statement is a full expression,
6361 i.e. temporaries created during that statement should be destroyed
6362 at the end of the statement. */
6365 stmts_are_full_exprs_p (void)
6370 /* Returns the stmt_tree (if any) to which statements are currently
6371 being added. If there is no active statement-tree, NULL is
6375 current_stmt_tree (void)
6377 return &c_stmt_tree;
6380 /* Returns the stack of SCOPE_STMTs for the current function. */
6383 current_scope_stmt_stack (void)
6385 return &c_scope_stmt_stack;
6388 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6392 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6397 /* Dummy function in place of callback used by C++. */
6400 extract_interface_info (void)
6404 /* Return a new COMPOUND_STMT, after adding it to the current
6408 c_begin_compound_stmt (void)
6412 /* Create the COMPOUND_STMT. */
6413 stmt = add_stmt (build_stmt (COMPOUND_STMT, error_mark_node));
6418 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6422 c_expand_decl_stmt (tree t)
6424 tree decl = DECL_STMT_DECL (t);
6426 /* Expand nested functions. */
6427 if (TREE_CODE (decl) == FUNCTION_DECL
6428 && DECL_CONTEXT (decl) == current_function_decl
6429 && DECL_SAVED_TREE (decl))
6430 c_expand_body_1 (decl, 1);
6433 /* Return the global value of T as a symbol. */
6436 identifier_global_value (tree t)
6438 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6439 if (decl == 0 || DECL_FILE_SCOPE_P (decl))
6442 /* Shadowed by something else; find the true global value. */
6443 for (decl = global_scope->names; decl; decl = TREE_CHAIN (decl))
6444 if (DECL_NAME (decl) == t)
6447 /* Only local values for this decl. */
6451 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6452 otherwise the name is found in ridpointers from RID_INDEX. */
6455 record_builtin_type (enum rid rid_index, const char *name, tree type)
6459 id = ridpointers[(int) rid_index];
6461 id = get_identifier (name);
6462 pushdecl (build_decl (TYPE_DECL, id, type));
6465 /* Build the void_list_node (void_type_node having been created). */
6467 build_void_list_node (void)
6469 tree t = build_tree_list (NULL_TREE, void_type_node);
6473 /* Return something to represent absolute declarators containing a *.
6474 TARGET is the absolute declarator that the * contains.
6475 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6476 to apply to the pointer type, represented as identifiers, possible mixed
6479 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6480 if attributes are present) and whose type is the modifier list. */
6483 make_pointer_declarator (tree type_quals_attrs, tree target)
6486 tree itarget = target;
6487 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6488 if (attrs != NULL_TREE)
6489 itarget = tree_cons (attrs, target, NULL_TREE);
6490 return build1 (INDIRECT_REF, quals, itarget);
6493 /* A wrapper around lhd_set_decl_assembler_name that gives static
6494 variables their C names if they are at file scope and only one
6495 translation unit is being compiled, for backwards compatibility
6496 with certain bizarre assembler hacks (like crtstuff.c). */
6499 c_static_assembler_name (tree decl)
6501 if (num_in_fnames == 1
6502 && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6503 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6504 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6506 lhd_set_decl_assembler_name (decl);
6509 /* Hash and equality functions for link_hash_table: key off
6510 DECL_ASSEMBLER_NAME. */
6513 link_hash_hash (const void *x_p)
6516 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6520 link_hash_eq (const void *x1_p, const void *x2_p)
6522 tree x1 = (tree)x1_p;
6523 tree x2 = (tree)x2_p;
6524 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6527 /* Propagate information between definitions and uses between multiple
6528 translation units in TU_LIST based on linkage rules. */
6531 merge_translation_unit_decls (void)
6533 const tree tu_list = current_file_decl;
6536 htab_t link_hash_table;
6539 /* Create the BLOCK that poplevel would have created, but don't
6540 actually call poplevel since that's expensive. */
6541 block = make_node (BLOCK);
6542 BLOCK_VARS (block) = current_scope->names;
6543 TREE_USED (block) = 1;
6544 DECL_INITIAL (current_file_decl) = block;
6546 /* If only one translation unit seen, no copying necessary. */
6547 if (TREE_CHAIN (tu_list) == NULL_TREE)
6550 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6552 /* Enter any actual definitions into the hash table. */
6553 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6554 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6555 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6558 slot = htab_find_slot (link_hash_table, decl, INSERT);
6560 /* If we've already got a definition, work out which one is
6561 the real one, put it into the hash table, and make the
6562 other one DECL_EXTERNAL. This is important to avoid
6563 putting out two definitions of the same symbol in the
6567 tree old_decl = (tree) *slot;
6569 /* If this is weak or common or whatever, suppress it
6570 in favor of the other definition. */
6571 if (DECL_WEAK (decl))
6572 DECL_EXTERNAL (decl) = 1;
6573 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6574 DECL_EXTERNAL (old_decl) = 1;
6575 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6576 DECL_EXTERNAL (decl) = 1;
6577 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6578 DECL_EXTERNAL (old_decl) = 1;
6580 if (DECL_EXTERNAL (decl))
6582 DECL_INITIAL (decl) = NULL_TREE;
6583 DECL_COMMON (decl) = 0;
6584 DECL_ONE_ONLY (decl) = 0;
6585 DECL_WEAK (decl) = 0;
6587 else if (DECL_EXTERNAL (old_decl))
6589 DECL_INITIAL (old_decl) = NULL_TREE;
6590 DECL_COMMON (old_decl) = 0;
6591 DECL_ONE_ONLY (old_decl) = 0;
6592 DECL_WEAK (old_decl) = 0;
6597 error ("%Jredefinition of global '%D'", decl, decl);
6598 error ("%J'%D' previously defined here", old_decl, old_decl);
6605 /* Now insert the desired information from all the definitions
6606 into any plain declarations. */
6607 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6608 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6609 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6612 global_decl = htab_find (link_hash_table, decl);
6617 /* Print any appropriate error messages, and partially merge
6619 (void) duplicate_decls (decl, global_decl);
6622 htab_delete (link_hash_table);
6625 /* Perform final processing on file-scope data. */
6628 c_write_global_declarations(void)
6632 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6634 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6635 int len = list_length (globals);
6636 tree *vec = xmalloc (sizeof (tree) * len);
6640 /* Process the decls in the order they were written. */
6642 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6645 wrapup_global_declarations (vec, len);
6647 check_global_declarations (vec, len);
6654 /* Reset the parser's state in preparation for a new file. */
6657 c_reset_state (void)
6660 tree file_scope_decl;
6662 /* Pop the global scope. */
6663 if (current_scope != global_scope)
6664 current_scope = global_scope;
6665 file_scope_decl = current_file_decl;
6666 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6667 BLOCK_SUPERCONTEXT (DECL_INITIAL (file_scope_decl)) = file_scope_decl;
6668 truly_local_externals = NULL_TREE;
6670 /* Start a new global binding level. */
6672 global_scope = current_scope;
6673 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6674 TREE_CHAIN (current_file_decl) = file_scope_decl;
6676 /* Reintroduce the builtin declarations. */
6677 for (link = first_builtin_decl;
6678 link != TREE_CHAIN (last_builtin_decl);
6679 link = TREE_CHAIN (link))
6680 pushdecl (copy_node (link));
6683 #include "gt-c-decl.h"