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 /* These #defines are for clarity in working with the information block
87 returned by get_parm_info. */
88 #define ARG_INFO_PARMS(args) TREE_PURPOSE(args)
89 #define ARG_INFO_TAGS(args) TREE_VALUE(args)
90 #define ARG_INFO_TYPES(args) TREE_CHAIN(args)
91 #define ARG_INFO_OTHERS(args) TREE_TYPE(args)
93 /* The file and line that the prototype came from if this is an
94 old-style definition; used for diagnostics in
95 store_parm_decls_oldstyle. */
97 static location_t current_function_prototype_locus;
99 /* The current statement tree. */
101 static GTY(()) struct stmt_tree_s c_stmt_tree;
103 /* The current scope statement stack. */
105 static GTY(()) tree c_scope_stmt_stack;
107 /* State saving variables. */
108 int c_in_iteration_stmt;
111 /* A list of external DECLs that appeared at block scope when there was
112 some other global meaning for that identifier. */
113 static GTY(()) tree truly_local_externals;
115 /* All the builtins; this is a subset of the entries of global_scope. */
117 static GTY(()) tree first_builtin_decl;
118 static GTY(()) tree last_builtin_decl;
120 /* A DECL for the current file-scope context. */
122 static GTY(()) tree current_file_decl;
124 /* Set to 0 at beginning of a function definition, set to 1 if
125 a return statement that specifies a return value is seen. */
127 int current_function_returns_value;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a return statement with no argument is seen. */
132 int current_function_returns_null;
134 /* Set to 0 at beginning of a function definition, set to 1 if
135 a call to a noreturn function is seen. */
137 int current_function_returns_abnormally;
139 /* Set to nonzero by `grokdeclarator' for a function
140 whose return type is defaulted, if warnings for this are desired. */
142 static int warn_about_return_type;
144 /* Nonzero when starting a function declared `extern inline'. */
146 static int current_extern_inline;
148 /* Each c_scope structure describes the complete contents of one scope.
149 Three scopes are distinguished specially: the innermost or current
150 scope, the innermost function scope, and the outermost or file scope.
152 Most declarations are recorded in the current scope.
154 All normal label declarations are recorded in the innermost
155 function scope, as are bindings of undeclared identifiers to
156 error_mark_node. (GCC permits nested functions as an extension,
157 hence the 'innermost' qualifier.) Explicitly declared labels
158 (using the __label__ extension) appear in the current scope.
160 Being in the global scope (current_scope == global_scope) causes
161 special behavior in several places below. Also, under some
162 conditions the Objective-C front end records declarations in the
163 global scope even though that isn't the current scope.
165 The order of the names, parms, and blocks lists matters, and they
166 are frequently appended to. To avoid having to walk all the way to
167 the end of the list on each insertion, or reverse the lists later,
168 we maintain a pointer to the last list entry for each of the lists.
170 The order of the tags, shadowed, and shadowed_tags
171 lists does not matter, so we just prepend to these lists. */
173 struct c_scope GTY(())
175 /* The scope containing this one. */
176 struct c_scope *outer;
178 /* The next outermost function scope. */
179 struct c_scope *outer_function;
181 /* All variables, constants, functions, labels, and typedef names. */
185 /* All parameter declarations. Used only in the outermost scope of
190 /* All structure, union, and enum type tags. */
193 /* For each scope, a list of shadowed outer-scope definitions
194 to be restored when this scope is popped.
195 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
196 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
199 /* For each scope, a list of shadowed outer-scope tag definitions
200 to be restored when this scope is popped.
201 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
202 whose TREE_VALUE is its old definition (a kind of ..._TYPE node). */
205 /* For each scope (except the global one), a chain of BLOCK nodes
206 for all the scopes that were entered and exited one level down. */
210 /* True if we are currently filling this scope with parameter
212 BOOL_BITFIELD parm_flag : 1;
214 /* True if we already complained about forward parameter decls
215 in this scope. This prevents double warnings on
216 foo (int a; int b; ...) */
217 BOOL_BITFIELD warned_forward_parm_decls : 1;
219 /* True if this is the outermost block scope of a function body.
220 This scope contains the parameters, the local variables declared
221 in the outermost block, and all the labels (except those in
222 nested functions, or declared at block scope with __label__). */
223 BOOL_BITFIELD function_body : 1;
225 /* True means make a BLOCK for this scope no matter what. */
226 BOOL_BITFIELD keep : 1;
229 /* The scope currently in effect. */
231 static GTY(()) struct c_scope *current_scope;
233 /* A chain of c_scope structures awaiting reuse. */
235 static GTY((deletable (""))) struct c_scope *scope_freelist;
237 /* The innermost function scope. Ordinary (not explicitly declared)
238 labels, bindings to error_mark_node, and the lazily-created
239 bindings of __func__ and its friends get this scope. */
241 static GTY(()) struct c_scope *current_function_scope;
243 /* The outermost scope, corresponding to the C "file scope". This is
244 created when the compiler is started and exists through the entire run. */
246 static GTY(()) struct c_scope *global_scope;
248 /* Append VAR to LIST in scope SCOPE. */
249 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
250 struct c_scope *s_ = (scope); \
252 if (s_->list##_last) \
253 TREE_CHAIN (s_->list##_last) = d_; \
256 s_->list##_last = d_; \
259 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
260 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
261 struct c_scope *t_ = (tscope); \
262 struct c_scope *f_ = (fscope); \
264 TREE_CHAIN (t_->to##_last) = f_->from; \
267 t_->to##_last = f_->from##_last; \
270 /* True means unconditionally make a BLOCK for the next scope pushed. */
272 static bool keep_next_level_flag;
274 /* True means the next call to pushlevel will be the outermost scope
275 of a function body, so do not push a new scope, merely cease
276 expecting parameter decls. */
278 static bool next_is_function_body;
280 /* Functions called automatically at the beginning and end of execution. */
282 tree static_ctors, static_dtors;
284 /* Forward declarations. */
286 static struct c_scope *make_scope (void);
287 static void pop_scope (void);
288 static tree make_label (tree, location_t);
289 static void bind_label (tree, tree, struct c_scope *);
290 static void implicit_decl_warning (tree);
291 static tree lookup_tag (enum tree_code, tree, int);
292 static tree lookup_name_current_level (tree);
293 static tree grokdeclarator (tree, tree, enum decl_context, int, tree *);
294 static tree grokparms (tree, int);
295 static void layout_array_type (tree);
296 static tree c_make_fname_decl (tree, int);
297 static void c_expand_body_1 (tree, int);
298 static tree any_external_decl (tree);
299 static void record_external_decl (tree);
300 static void warn_if_shadowing (tree, tree);
301 static void check_bitfield_type_and_width (tree *, tree *, const char *);
302 static void clone_underlying_type (tree);
303 static bool flexible_array_type_p (tree);
304 static hashval_t link_hash_hash (const void *);
305 static int link_hash_eq (const void *, const void *);
307 /* States indicating how grokdeclarator() should handle declspecs marked
308 with __attribute__((deprecated)). An object declared as
309 __attribute__((deprecated)) suppresses warnings of uses of other
312 enum deprecated_states {
317 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
320 c_print_identifier (FILE *file, tree node, int indent)
322 print_node (file, "symbol", IDENTIFIER_SYMBOL_VALUE (node), indent + 4);
323 print_node (file, "tag", IDENTIFIER_TAG_VALUE (node), indent + 4);
324 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
325 if (C_IS_RESERVED_WORD (node))
327 tree rid = ridpointers[C_RID_CODE (node)];
328 indent_to (file, indent + 4);
329 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
330 (void *) rid, IDENTIFIER_POINTER (rid));
334 /* Hook called at end of compilation to assume 1 elt
335 for a file-scope tentative array defn that wasn't complete before. */
338 c_finish_incomplete_decl (tree decl)
340 if (TREE_CODE (decl) == VAR_DECL)
342 tree type = TREE_TYPE (decl);
343 if (type != error_mark_node
344 && TREE_CODE (type) == ARRAY_TYPE
345 && ! DECL_EXTERNAL (decl)
346 && TYPE_DOMAIN (type) == 0)
348 warning ("%Jarray '%D' assumed to have one element", decl, decl);
350 complete_array_type (type, NULL_TREE, 1);
352 layout_decl (decl, 0);
357 /* Reuse or create a struct for this scope. */
359 static struct c_scope *
362 struct c_scope *result;
365 result = scope_freelist;
366 scope_freelist = result->outer;
369 result = ggc_alloc_cleared (sizeof (struct c_scope));
374 /* Remove the topmost scope from the stack and add it to the
375 free list, updating current_function_scope if necessary. */
380 struct c_scope *scope = current_scope;
382 current_scope = scope->outer;
383 if (scope->function_body)
384 current_function_scope = scope->outer_function;
386 memset (scope, 0, sizeof (struct c_scope));
387 scope->outer = scope_freelist;
388 scope_freelist = scope;
391 /* The Objective-C front-end often needs to determine the current scope. */
394 get_current_scope (void)
396 return current_scope;
399 /* The following function is used only by Objective-C. It needs to live here
400 because it accesses the innards of c_scope. */
403 objc_mark_locals_volatile (void *enclosing_blk)
405 struct c_scope *scope;
407 for (scope = current_scope;
408 scope && scope != enclosing_blk;
409 scope = scope->outer)
413 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
415 DECL_REGISTER (decl) = 0;
416 TREE_THIS_VOLATILE (decl) = 1;
418 /* Do not climb up past the current function. */
419 if (scope->function_body)
424 /* Nonzero if we are currently in the global scope. */
427 global_bindings_p (void)
429 return current_scope == global_scope;
433 keep_next_level (void)
435 keep_next_level_flag = true;
438 /* Identify this scope as currently being filled with parameters. */
441 declare_parm_level (void)
443 current_scope->parm_flag = true;
446 /* Nonzero if currently making parm declarations. */
449 in_parm_level_p (void)
451 return current_scope->parm_flag;
454 /* Enter a new scope. The dummy parameter is for signature
455 compatibility with lang_hooks.decls.pushlevel. */
458 pushlevel (int dummy ATTRIBUTE_UNUSED)
460 if (next_is_function_body)
462 /* This is the transition from the parameters to the top level
463 of the function body. These are the same scope
464 (C99 6.2.1p4,6) so we do not push another scope structure.
465 next_is_function_body is set only by store_parm_decls, which
466 in turn is called when and only when we are about to
467 encounter the opening curly brace for the function body.
469 The outermost block of a function always gets a BLOCK node,
470 because the debugging output routines expect that each
471 function has at least one BLOCK. */
472 current_scope->parm_flag = false;
473 current_scope->function_body = true;
474 current_scope->keep = true;
475 current_scope->outer_function = current_function_scope;
476 current_function_scope = current_scope;
478 keep_next_level_flag = false;
479 next_is_function_body = false;
483 struct c_scope *scope = make_scope ();
485 scope->keep = keep_next_level_flag;
486 scope->outer = current_scope;
487 current_scope = scope;
488 keep_next_level_flag = false;
492 /* Exit a scope. Restore the state of the identifier-decl mappings
493 that were in effect when this scope was entered.
495 If KEEP is KEEP_YES (1), this scope had explicit declarations, so
496 create a BLOCK node to record its declarations and subblocks for
497 debugging output. If KEEP is KEEP_MAYBE, do so only if the names
498 or tags lists are nonempty.
500 The second parameter is ignored; it is present only for
501 signature compatibility with lang_hooks.decls.poplevel.
503 If FUNCTIONBODY is nonzero, this level is the body of a function,
504 even if current_scope->function_body is not set. This is used
505 by language-independent code that generates synthetic functions,
506 and cannot set current_scope->function_body.
508 FIXME: Eliminate the need for all arguments. */
511 poplevel (int keep, int dummy ATTRIBUTE_UNUSED, int functionbody)
513 struct c_scope *scope = current_scope;
518 /* The following line does not use |= due to a bug in HP's C compiler. */
519 scope->function_body = scope->function_body | functionbody;
521 if (keep == KEEP_MAYBE)
522 keep = (scope->names || scope->tags);
525 keep |= scope->function_body;
527 /* If appropriate, create a BLOCK to record the decls for the life
532 block = make_node (BLOCK);
533 BLOCK_VARS (block) = scope->names;
534 BLOCK_SUBBLOCKS (block) = scope->blocks;
535 TREE_USED (block) = 1;
538 /* In each subblock, record that this is its superior. */
539 for (p = scope->blocks; p; p = TREE_CHAIN (p))
540 BLOCK_SUPERCONTEXT (p) = block;
542 /* Clear out the variable bindings in this scope.
544 Propagate TREE_ADDRESSABLE from nested functions to their
545 containing functions.
547 Issue warnings for unused variables and labels, and errors for
548 undefined labels, if there are any. */
550 for (p = scope->names; p; p = TREE_CHAIN (p))
552 switch (TREE_CODE (p))
555 if (TREE_USED (p) && !DECL_INITIAL (p))
557 error ("%Jlabel `%D' used but not defined", p, p);
558 DECL_INITIAL (p) = error_mark_node;
560 else if (!TREE_USED (p) && warn_unused_label)
562 if (DECL_INITIAL (p))
563 warning ("%Jlabel `%D' defined but not used", p, p);
565 warning ("%Jlabel `%D' declared but not defined", p, p);
568 IDENTIFIER_LABEL_VALUE (DECL_NAME (p)) = 0;
572 if (! TREE_ASM_WRITTEN (p)
573 && DECL_INITIAL (p) != 0
574 && TREE_ADDRESSABLE (p)
575 && DECL_ABSTRACT_ORIGIN (p) != 0
576 && DECL_ABSTRACT_ORIGIN (p) != p)
577 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
581 /* Keep this in sync with stmt.c:warn_about_unused_variables.
582 No warnings when the global scope is popped because the
583 global scope isn't popped for the last translation unit,
584 so the warnings are done in c_write_global_declaration. */
585 if (warn_unused_variable && scope != global_scope
587 && !DECL_IN_SYSTEM_HEADER (p)
589 && !DECL_ARTIFICIAL (p))
590 warning ("%Junused variable `%D'", p, p);
597 if (DECL_EXTERNAL (p) && scope != global_scope)
598 /* External decls stay in the symbol-value slot but are
600 C_DECL_INVISIBLE (p) = 1;
602 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p)) = 0;
608 /* Clear out the parameter bindings in this scope, if any.
609 Unused-parameter warnings are handled by function.c. */
610 for (p = scope->parms; p; p = TREE_CHAIN (p))
612 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p)) = 0;
614 /* Clear out the tag-meanings declared in this scope.
616 Set the TYPE_CONTEXTs for all of the tagged types belonging to
617 this scope so that they point to the appropriate construct, i.e.
618 either to the current FUNCTION_DECL node, or else to the BLOCK
619 node we just constructed.
621 Note that for tagged types whose scope is just the formal
622 parameter list for some function type specification, we can't
623 properly set their TYPE_CONTEXTs here, because we don't have a
624 pointer to the appropriate FUNCTION_TYPE node readily available
625 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
626 type nodes get set in `grokdeclarator' as soon as we have created
627 the FUNCTION_TYPE node which will represent the "scope" for these
628 "parameter list local" tagged types. */
630 decl = scope->function_body ? current_function_decl : block;
631 for (p = scope->tags; p; p = TREE_CHAIN (p))
633 if (TREE_PURPOSE (p))
634 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p)) = 0;
636 TYPE_CONTEXT (TREE_VALUE (p)) = decl;
639 /* Restore all name- and label-meanings from outer scopes that were
640 shadowed by this scope. */
641 for (p = scope->shadowed; p; p = TREE_CHAIN (p))
642 if (TREE_VALUE (p) && TREE_CODE (TREE_VALUE (p)) == LABEL_DECL)
643 IDENTIFIER_LABEL_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
645 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
647 /* Restore all tag-meanings from outer scopes that were shadowed by
649 for (p = scope->shadowed_tags; p; p = TREE_CHAIN (p))
650 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
652 /* Dispose of the block that we just made inside some higher level. */
653 if (scope->function_body && current_function_decl)
654 DECL_INITIAL (current_function_decl) = block;
655 else if (scope->outer)
658 SCOPE_LIST_APPEND (scope->outer, blocks, block);
659 /* If we did not make a block for the scope just exited, any
660 blocks made for inner scopes must be carried forward so they
661 will later become subblocks of something else. */
662 else if (scope->blocks)
663 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
666 /* Pop the current scope, and free the structure for reuse. */
672 /* Insert BLOCK at the end of the list of subblocks of the current
673 scope. This is used when a BIND_EXPR is expanded, to handle the
674 BLOCK node inside the BIND_EXPR. */
677 insert_block (tree block)
679 TREE_USED (block) = 1;
680 SCOPE_LIST_APPEND (current_scope, blocks, block);
683 /* Set the BLOCK node for the innermost scope (the one we are
684 currently in). The RTL expansion machinery requires us to provide
685 this hook, but it is not useful in function-at-a-time mode. */
688 set_block (tree block ATTRIBUTE_UNUSED)
692 /* Push a definition or a declaration of struct, union or enum tag "name".
693 "type" should be the type node.
694 We assume that the tag "name" is not already defined.
696 Note that the definition may really be just a forward reference.
697 In that case, the TYPE_SIZE will be zero. */
700 pushtag (tree name, tree type)
702 struct c_scope *b = current_scope;
704 /* Record the identifier as the type's name if it has none. */
707 if (TYPE_NAME (type) == 0)
708 TYPE_NAME (type) = name;
710 if (IDENTIFIER_TAG_VALUE (name))
711 b->shadowed_tags = tree_cons (name, IDENTIFIER_TAG_VALUE (name),
713 IDENTIFIER_TAG_VALUE (name) = type;
716 b->tags = tree_cons (name, type, b->tags);
718 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
719 tagged type we just added to the current scope. This fake
720 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
721 to output a representation of a tagged type, and it also gives
722 us a convenient place to record the "scope start" address for the
725 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
727 /* An approximation for now, so we can tell this is a function-scope tag.
728 This will be updated in poplevel. */
729 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
732 /* Subroutine of compare_decls. Allow harmless mismatches in return
733 and argument types provided that the type modes match. This function
734 return a unified type given a suitable match, and 0 otherwise. */
737 match_builtin_function_types (tree newtype, tree oldtype)
739 tree newrettype, oldrettype;
740 tree newargs, oldargs;
741 tree trytype, tryargs;
743 /* Accept the return type of the new declaration if same modes. */
744 oldrettype = TREE_TYPE (oldtype);
745 newrettype = TREE_TYPE (newtype);
747 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
750 oldargs = TYPE_ARG_TYPES (oldtype);
751 newargs = TYPE_ARG_TYPES (newtype);
754 while (oldargs || newargs)
758 || ! TREE_VALUE (oldargs)
759 || ! TREE_VALUE (newargs)
760 || TYPE_MODE (TREE_VALUE (oldargs))
761 != TYPE_MODE (TREE_VALUE (newargs)))
764 oldargs = TREE_CHAIN (oldargs);
765 newargs = TREE_CHAIN (newargs);
768 trytype = build_function_type (newrettype, tryargs);
769 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
772 /* Subroutine of diagnose_mismatched_decls. Check for function type
773 mismatch involving an empty arglist vs a nonempty one and give clearer
776 diagnose_arglist_conflict (tree newdecl, tree olddecl,
777 tree newtype, tree oldtype)
781 if (TREE_CODE (olddecl) != FUNCTION_DECL
782 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype), COMPARE_STRICT)
783 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
785 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
788 t = TYPE_ARG_TYPES (oldtype);
790 t = TYPE_ARG_TYPES (newtype);
791 for (; t; t = TREE_CHAIN (t))
793 tree type = TREE_VALUE (t);
795 if (TREE_CHAIN (t) == 0
796 && TYPE_MAIN_VARIANT (type) != void_type_node)
798 inform ("a parameter list with an ellipsis can't match "
799 "an empty parameter name list declaration");
803 if (c_type_promotes_to (type) != type)
805 inform ("an argument type that has a default promotion can't match "
806 "an empty parameter name list declaration");
812 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
813 old-style function definition, NEWDECL is a prototype declaration.
814 Diagnose inconsistencies in the argument list. Returns TRUE if
815 the prototype is compatible, FALSE if not. */
817 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
819 tree newargs, oldargs;
822 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
823 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
825 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
826 newargs = TYPE_ARG_TYPES (newtype);
831 tree oldargtype = TREE_VALUE (oldargs);
832 tree newargtype = TREE_VALUE (newargs);
834 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
837 /* Reaching the end of just one list means the two decls don't
838 agree on the number of arguments. */
839 if (END_OF_ARGLIST (oldargtype))
841 error ("%Jprototype for '%D' declares more arguments "
842 "than previous old-style definition", newdecl, newdecl);
845 else if (END_OF_ARGLIST (newargtype))
847 error ("%Jprototype for '%D' declares fewer arguments "
848 "than previous old-style definition", newdecl, newdecl);
852 /* Type for passing arg must be consistent with that declared
854 else if (! comptypes (oldargtype, newargtype, COMPARE_STRICT))
856 error ("%Jprototype for '%D' declares arg %d with incompatible type",
857 newdecl, newdecl, i);
861 oldargs = TREE_CHAIN (oldargs);
862 newargs = TREE_CHAIN (newargs);
866 /* If we get here, no errors were found, but do issue a warning
867 for this poor-style construct. */
868 warning ("%Jprototype for '%D' follows non-prototype definition",
871 #undef END_OF_ARGLIST
874 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
875 first in a pair of mismatched declarations, using the diagnostic
878 locate_old_decl (tree decl, void (*diag)(const char *, ...))
880 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
882 else if (DECL_INITIAL (decl))
883 diag (N_("%Jprevious definition of '%D' was here"), decl, decl);
884 else if (C_DECL_IMPLICIT (decl))
885 diag (N_("%Jprevious implicit declaration of '%D' was here"), decl, decl);
887 diag (N_("%Jprevious declaration of '%D' was here"), decl, decl);
890 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
891 Returns true if the caller should proceed to merge the two, false
892 if OLDDECL should simply be discarded. As a side effect, issues
893 all necessary diagnostics for invalid or poor-style combinations.
894 If it returns true, writes the types of NEWDECL and OLDDECL to
895 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
896 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
899 diagnose_mismatched_decls (tree newdecl, tree olddecl,
900 tree *newtypep, tree *oldtypep)
902 tree newtype, oldtype;
903 bool pedwarned = false;
906 /* If we have error_mark_node for either decl or type, just discard
907 the previous decl - we're in an error cascade already. */
908 if (olddecl == error_mark_node || newdecl == error_mark_node)
910 *oldtypep = oldtype = TREE_TYPE (olddecl);
911 *newtypep = newtype = TREE_TYPE (newdecl);
912 if (oldtype == error_mark_node || newtype == error_mark_node)
915 /* Two different categories of symbol altogether. This is an error
916 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
917 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
919 if (TREE_CODE (olddecl) != FUNCTION_DECL
920 || !DECL_BUILT_IN (olddecl) || !C_DECL_INVISIBLE (olddecl))
922 error ("%J'%D' redeclared as different kind of symbol",
924 locate_old_decl (olddecl, error);
926 else if (TREE_PUBLIC (newdecl))
927 warning ("%Jbuilt-in function '%D' declared as non-function",
929 else if (warn_shadow)
930 warning ("%Jshadowing built-in function '%D'",
935 if (!comptypes (oldtype, newtype, COMPARE_STRICT))
937 if (TREE_CODE (olddecl) == FUNCTION_DECL
938 && DECL_BUILT_IN (olddecl) && C_DECL_INVISIBLE (olddecl))
940 /* Accept harmless mismatch in function types.
941 This is for the ffs and fprintf builtins. */
942 tree trytype = match_builtin_function_types (newtype, oldtype);
944 if (trytype && comptypes (newtype, trytype, COMPARE_STRICT))
945 *oldtypep = oldtype = trytype;
948 /* If types don't match for a built-in, throw away the
949 built-in. No point in calling locate_old_decl here, it
950 won't print anything. */
951 warning ("%Jconflicting types for built-in function '%D'",
956 else if (TREE_CODE (olddecl) == FUNCTION_DECL
957 && DECL_SOURCE_LINE (olddecl) == 0)
959 /* A conflicting function declaration for a predeclared
960 function that isn't actually built in. Objective C uses
961 these. The new declaration silently overrides everything
962 but the volatility (i.e. noreturn) indication. See also
963 below. FIXME: Make Objective C use normal builtins. */
964 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
967 /* Permit void foo (...) to match int foo (...) if the latter is
968 the definition and implicit int was used. See
969 c-torture/compile/920625-2.c. */
970 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
971 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
972 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
973 && C_FUNCTION_IMPLICIT_INT (newdecl))
975 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
976 /* Make sure we keep void as the return type. */
977 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
978 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
983 error ("%Jconflicting types for '%D'", newdecl, newdecl);
984 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
985 locate_old_decl (olddecl, error);
990 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
991 but silently ignore the redeclaration if either is in a system
992 header. (Conflicting redeclarations were handled above.) */
993 if (TREE_CODE (newdecl) == TYPE_DECL)
995 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
996 return true; /* Allow OLDDECL to continue in use. */
998 error ("%Jredefinition of typedef '%D'", newdecl, newdecl);
999 locate_old_decl (olddecl, error);
1003 /* Function declarations can either be 'static' or 'extern' (no
1004 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1005 can never conflict with each other on account of linkage (6.2.2p4).
1006 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1007 two definitions if one is 'extern inline' and one is not. The non-
1008 extern-inline definition supersedes the extern-inline definition. */
1009 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1011 /* If you declare a built-in function name as static, or
1012 define the built-in with an old-style definition (so we
1013 can't validate the argument list) the built-in definition is
1014 overridden, but optionally warn this was a bad choice of name. */
1015 if (DECL_BUILT_IN (olddecl)
1016 && C_DECL_INVISIBLE (olddecl)
1017 && (!TREE_PUBLIC (newdecl)
1018 || (DECL_INITIAL (newdecl)
1019 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1022 warning ("%Jshadowing built-in function '%D'", newdecl, newdecl);
1023 /* Discard the old built-in function. */
1027 if (DECL_INITIAL (newdecl))
1029 if (DECL_INITIAL (olddecl)
1030 && !(DECL_DECLARED_INLINE_P (olddecl)
1031 && DECL_EXTERNAL (olddecl)
1032 && !(DECL_DECLARED_INLINE_P (newdecl)
1033 && DECL_EXTERNAL (newdecl))))
1035 error ("%Jredefinition of '%D'", newdecl, newdecl);
1036 locate_old_decl (olddecl, error);
1040 /* If we have a prototype after an old-style function definition,
1041 the argument types must be checked specially. */
1042 else if (DECL_INITIAL (olddecl)
1043 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1044 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1045 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1047 locate_old_decl (olddecl, error);
1050 /* Mismatched non-static and static is considered poor style.
1051 We only diagnose static then non-static if -Wtraditional,
1052 because it is the most convenient way to get some effects
1053 (see e.g. what unwind-dw2-fde-glibc.c does to the definition
1054 of _Unwind_Find_FDE in unwind-dw2-fde.c). Revisit? */
1055 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1057 /* A static function declaration for a predeclared function
1058 that isn't actually built in, silently overrides the
1059 default. Objective C uses these. See also above.
1060 FIXME: Make Objective C use normal builtins. */
1061 if (TREE_CODE (olddecl) == FUNCTION_DECL
1062 && DECL_SOURCE_LINE (olddecl) == 0)
1066 warning ("%Jstatic declaration of '%D' follows "
1067 "non-static declaration", newdecl, newdecl);
1071 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl)
1072 && warn_traditional)
1074 warning ("%Jnon-static declaration of '%D' follows "
1075 "static declaration", newdecl, newdecl);
1079 else if (TREE_CODE (newdecl) == VAR_DECL)
1081 /* Only variables can be thread-local, and all declarations must
1082 agree on this property. */
1083 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1085 if (DECL_THREAD_LOCAL (newdecl))
1086 error ("%Jthread-local declaration of '%D' follows "
1087 "non-thread-local declaration", newdecl, newdecl);
1089 error ("%Jnon-thread-local declaration of '%D' follows "
1090 "thread-local declaration", newdecl, newdecl);
1092 locate_old_decl (olddecl, error);
1096 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1097 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1099 error ("%Jredefinition of '%D'", newdecl, newdecl);
1100 locate_old_decl (olddecl, error);
1104 /* Objects declared at file scope: if at least one is 'extern',
1105 it's fine (6.2.2p4); otherwise the linkage must agree (6.2.2p7). */
1106 if (DECL_FILE_SCOPE_P (newdecl))
1108 if (!DECL_EXTERNAL (newdecl)
1109 && !DECL_EXTERNAL (olddecl)
1110 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1112 if (TREE_PUBLIC (newdecl))
1113 error ("%Jnon-static declaration of '%D' follows "
1114 "static declaration", newdecl, newdecl);
1116 error ("%Jstatic declaration of '%D' follows "
1117 "non-static declaration", newdecl, newdecl);
1119 locate_old_decl (olddecl, error);
1123 /* Two objects with the same name declared at the same block
1124 scope must both be external references (6.7p3). */
1125 else if (DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl)
1126 && (!DECL_EXTERNAL (newdecl) || !DECL_EXTERNAL (olddecl)))
1128 if (DECL_EXTERNAL (newdecl))
1129 error ("%Jextern declaration of '%D' follows "
1130 "declaration with no linkage", newdecl, newdecl);
1131 else if (DECL_EXTERNAL (olddecl))
1132 error ("%Jdeclaration of '%D' with no linkage follows "
1133 "extern declaration", newdecl, newdecl);
1135 error ("%Jredeclaration of '%D' with no linkage",
1138 locate_old_decl (olddecl, error);
1144 /* All decls must agree on a non-default visibility. */
1145 if (DECL_VISIBILITY (newdecl) != VISIBILITY_DEFAULT
1146 && DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT
1147 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1149 warning ("%Jredeclaration of '%D' with different visibility "
1150 "(old visibility preserved)", newdecl, newdecl);
1154 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1156 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1157 if (DECL_DECLARED_INLINE_P (newdecl)
1158 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1160 warning ("%Jinline declaration of '%D' follows "
1161 "declaration with attribute noinline", newdecl, newdecl);
1164 else if (DECL_DECLARED_INLINE_P (olddecl)
1165 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1167 warning ("%Jdeclaration of '%D' with attribute noinline follows "
1168 "inline declaration ", newdecl, newdecl);
1172 /* Inline declaration after use or definition.
1173 ??? Should we still warn about this now we have unit-at-a-time
1174 mode and can get it right? */
1175 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl))
1177 if (TREE_USED (olddecl))
1179 warning ("%J'%D' declared inline after being called",
1183 else if (DECL_INITIAL (olddecl))
1185 warning ("%J'%D' declared inline after its definition",
1191 else /* PARM_DECL, VAR_DECL */
1193 /* Redeclaration of a PARM_DECL is invalid unless this is the
1194 real position of a forward-declared parameter (GCC extension). */
1195 if (TREE_CODE (newdecl) == PARM_DECL
1196 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1198 error ("%Jredefinition of parameter '%D'", newdecl, newdecl);
1199 locate_old_decl (olddecl, error);
1203 /* These bits are only type qualifiers when applied to objects. */
1204 if (TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl))
1206 if (TREE_THIS_VOLATILE (newdecl))
1207 pedwarn ("%Jvolatile declaration of '%D' follows "
1208 "non-volatile declaration", newdecl, newdecl);
1210 pedwarn ("%Jnon-volatile declaration of '%D' follows "
1211 "volatile declaration", newdecl, newdecl);
1214 if (TREE_READONLY (newdecl) != TREE_READONLY (olddecl))
1216 if (TREE_READONLY (newdecl))
1217 pedwarn ("%Jconst declaration of '%D' follows "
1218 "non-const declaration", newdecl, newdecl);
1220 pedwarn ("%Jnon-const declaration of '%D' follows "
1221 "const declaration", newdecl, newdecl);
1226 /* Optional warning for completely redundant decls. */
1227 if (!warned && !pedwarned
1228 && warn_redundant_decls
1229 /* Don't warn about a function declaration followed by a
1231 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1232 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1233 /* Don't warn about an extern followed by a definition. */
1234 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1235 /* Don't warn about forward parameter decls. */
1236 && !(TREE_CODE (newdecl) == PARM_DECL
1237 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1239 warning ("%Jredundant redeclaration of '%D'", newdecl, newdecl);
1243 /* Report location of previous decl/defn in a consistent manner. */
1244 if (warned || pedwarned)
1245 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1250 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1251 consistent with OLDDECL, but carries new information. Merge the
1252 new information into OLDDECL. This function issues no
1256 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1258 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1259 && DECL_INITIAL (newdecl) != 0);
1261 /* For real parm decl following a forward decl, return 1 so old decl
1262 will be reused. Only allow this to happen once. */
1263 if (TREE_CODE (newdecl) == PARM_DECL
1264 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1266 TREE_ASM_WRITTEN (olddecl) = 0;
1270 DECL_ATTRIBUTES (newdecl)
1271 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1273 /* Merge the data types specified in the two decls. */
1275 = TREE_TYPE (olddecl)
1276 = common_type (newtype, oldtype);
1278 /* Lay the type out, unless already done. */
1279 if (oldtype != TREE_TYPE (newdecl))
1281 if (TREE_TYPE (newdecl) != error_mark_node)
1282 layout_type (TREE_TYPE (newdecl));
1283 if (TREE_CODE (newdecl) != FUNCTION_DECL
1284 && TREE_CODE (newdecl) != TYPE_DECL
1285 && TREE_CODE (newdecl) != CONST_DECL)
1286 layout_decl (newdecl, 0);
1290 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1291 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1292 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1293 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1294 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1295 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1297 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1298 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1302 /* Keep the old rtl since we can safely use it. */
1303 COPY_DECL_RTL (olddecl, newdecl);
1305 /* Merge the type qualifiers. */
1306 if (TREE_READONLY (newdecl))
1307 TREE_READONLY (olddecl) = 1;
1309 if (TREE_THIS_VOLATILE (newdecl))
1311 TREE_THIS_VOLATILE (olddecl) = 1;
1312 if (TREE_CODE (newdecl) == VAR_DECL)
1313 make_var_volatile (newdecl);
1316 /* Keep source location of definition rather than declaration. */
1317 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1318 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1320 /* Merge the unused-warning information. */
1321 if (DECL_IN_SYSTEM_HEADER (olddecl))
1322 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1323 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1324 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1326 /* Merge the initialization information. */
1327 if (DECL_INITIAL (newdecl) == 0)
1328 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1330 /* Merge the section attribute.
1331 We want to issue an error if the sections conflict but that must be
1332 done later in decl_attributes since we are called before attributes
1334 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1335 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1337 /* Copy the assembler name.
1338 Currently, it can only be defined in the prototype. */
1339 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1341 /* If either declaration has a nondefault visibility, use it. */
1342 if (DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT)
1343 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1345 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1347 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1348 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1349 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1350 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1351 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1352 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1353 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1354 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1355 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1358 /* Merge the storage class information. */
1359 merge_weak (newdecl, olddecl);
1361 /* For functions, static overrides non-static. */
1362 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1364 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1365 /* This is since we don't automatically
1366 copy the attributes of NEWDECL into OLDDECL. */
1367 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1368 /* If this clears `static', clear it in the identifier too. */
1369 if (! TREE_PUBLIC (olddecl))
1370 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1372 if (DECL_EXTERNAL (newdecl))
1374 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1375 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1377 /* An extern decl does not override previous storage class. */
1378 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1379 if (! DECL_EXTERNAL (newdecl))
1381 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1382 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1387 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1388 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1391 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1393 /* If we're redefining a function previously defined as extern
1394 inline, make sure we emit debug info for the inline before we
1395 throw it away, in case it was inlined into a function that hasn't
1396 been written out yet. */
1397 if (new_is_definition && DECL_INITIAL (olddecl))
1399 if (TREE_USED (olddecl)
1400 /* In unit-at-a-time mode we never inline re-defined extern
1401 inline functions. */
1402 && !flag_unit_at_a_time
1403 && cgraph_function_possibly_inlined_p (olddecl))
1404 (*debug_hooks->outlining_inline_function) (olddecl);
1406 /* The new defn must not be inline. */
1407 DECL_INLINE (newdecl) = 0;
1408 DECL_UNINLINABLE (newdecl) = 1;
1412 /* If either decl says `inline', this fn is inline,
1413 unless its definition was passed already. */
1414 if (DECL_DECLARED_INLINE_P (newdecl)
1415 || DECL_DECLARED_INLINE_P (olddecl))
1416 DECL_DECLARED_INLINE_P (newdecl) = 1;
1418 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1419 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1422 if (DECL_BUILT_IN (olddecl))
1424 /* If redeclaring a builtin function, it stays built in. */
1425 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1426 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1429 /* Also preserve various other info from the definition. */
1430 if (! new_is_definition)
1432 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1433 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1434 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1435 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1436 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1438 /* Set DECL_INLINE on the declaration if we've got a body
1439 from which to instantiate. */
1440 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1442 DECL_INLINE (newdecl) = 1;
1443 DECL_ABSTRACT_ORIGIN (newdecl)
1444 = DECL_ABSTRACT_ORIGIN (olddecl);
1449 /* If a previous declaration said inline, mark the
1450 definition as inlinable. */
1451 if (DECL_DECLARED_INLINE_P (newdecl)
1452 && ! DECL_UNINLINABLE (newdecl))
1453 DECL_INLINE (newdecl) = 1;
1457 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1458 But preserve OLDDECL's DECL_UID. */
1460 unsigned olddecl_uid = DECL_UID (olddecl);
1462 memcpy ((char *) olddecl + sizeof (struct tree_common),
1463 (char *) newdecl + sizeof (struct tree_common),
1464 sizeof (struct tree_decl) - sizeof (struct tree_common));
1465 DECL_UID (olddecl) = olddecl_uid;
1468 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1469 so that encode_section_info has a chance to look at the new decl
1470 flags and attributes. */
1471 if (DECL_RTL_SET_P (olddecl)
1472 && (TREE_CODE (olddecl) == FUNCTION_DECL
1473 || (TREE_CODE (olddecl) == VAR_DECL
1474 && TREE_STATIC (olddecl))))
1475 make_decl_rtl (olddecl, NULL);
1478 /* Handle when a new declaration NEWDECL has the same name as an old
1479 one OLDDECL in the same binding contour. Prints an error message
1482 If safely possible, alter OLDDECL to look like NEWDECL, and return
1483 true. Otherwise, return false. */
1486 duplicate_decls (tree newdecl, tree olddecl)
1488 tree newtype, oldtype;
1490 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1493 merge_decls (newdecl, olddecl, newtype, oldtype);
1498 /* Return any external DECL associated with ID, whether or not it is
1499 currently in scope. */
1502 any_external_decl (tree id)
1504 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1507 if (decl == 0 || TREE_CODE (decl) == ERROR_MARK)
1509 else if (TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1512 t = purpose_member (id, truly_local_externals);
1514 return TREE_VALUE (t);
1519 /* Record an external decl DECL. This only does something if a
1520 shadowing decl already exists. */
1522 record_external_decl (tree decl)
1524 tree name = DECL_NAME (decl);
1525 if (!IDENTIFIER_SYMBOL_VALUE (name))
1528 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1531 /* Check whether decl-node X shadows an existing declaration.
1532 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1533 which might be a NULL_TREE. */
1535 warn_if_shadowing (tree x, tree old)
1537 /* Nothing to shadow? */
1539 /* Shadow warnings not wanted? */
1541 /* No shadow warnings for internally generated vars. */
1542 || DECL_SOURCE_LINE (x) == 0
1543 /* No shadow warnings for vars made for inlining. */
1544 || DECL_FROM_INLINE (x)
1545 /* Don't warn about the parm names in function declarator
1546 within a function declarator.
1547 It would be nice to avoid warning in any function
1548 declarator in a declaration, as opposed to a definition,
1549 but there is no way to tell it's not a definition. */
1550 || (TREE_CODE (x) == PARM_DECL && current_scope->outer->parm_flag))
1553 if (TREE_CODE (old) == PARM_DECL)
1554 warning ("%Jdeclaration of '%D' shadows a parameter", x, x);
1555 else if (DECL_FILE_SCOPE_P (old))
1556 warning ("%Jdeclaration of '%D' shadows a global declaration", x, x);
1558 warning ("%Jdeclaration of '%D' shadows a previous local", x, x);
1560 warning ("%Jshadowed declaration is here", old);
1564 /* Subroutine of pushdecl.
1566 X is a TYPE_DECL for a typedef statement. Create a brand new
1567 ..._TYPE node (which will be just a variant of the existing
1568 ..._TYPE node with identical properties) and then install X
1569 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1571 The whole point here is to end up with a situation where each
1572 and every ..._TYPE node the compiler creates will be uniquely
1573 associated with AT MOST one node representing a typedef name.
1574 This way, even though the compiler substitutes corresponding
1575 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1576 early on, later parts of the compiler can always do the reverse
1577 translation and get back the corresponding typedef name. For
1580 typedef struct S MY_TYPE;
1583 Later parts of the compiler might only know that `object' was of
1584 type `struct S' if it were not for code just below. With this
1585 code however, later parts of the compiler see something like:
1587 struct S' == struct S
1588 typedef struct S' MY_TYPE;
1591 And they can then deduce (from the node for type struct S') that
1592 the original object declaration was:
1596 Being able to do this is important for proper support of protoize,
1597 and also for generating precise symbolic debugging information
1598 which takes full account of the programmer's (typedef) vocabulary.
1600 Obviously, we don't want to generate a duplicate ..._TYPE node if
1601 the TYPE_DECL node that we are now processing really represents a
1602 standard built-in type.
1604 Since all standard types are effectively declared at line zero
1605 in the source file, we can easily check to see if we are working
1606 on a standard type by checking the current value of lineno. */
1609 clone_underlying_type (tree x)
1611 if (DECL_SOURCE_LINE (x) == 0)
1613 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1614 TYPE_NAME (TREE_TYPE (x)) = x;
1616 else if (TREE_TYPE (x) != error_mark_node
1617 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1619 tree tt = TREE_TYPE (x);
1620 DECL_ORIGINAL_TYPE (x) = tt;
1621 tt = build_type_copy (tt);
1623 TREE_USED (tt) = TREE_USED (x);
1628 /* Record a decl-node X as belonging to the current lexical scope.
1629 Check for errors (such as an incompatible declaration for the same
1630 name already seen in the same scope).
1632 Returns either X or an old decl for the same name.
1633 If an old decl is returned, it may have been smashed
1634 to agree with what X says. */
1639 tree name = DECL_NAME (x);
1640 struct c_scope *scope = current_scope;
1642 #ifdef ENABLE_CHECKING
1643 if (error_mark_node == 0)
1644 /* Called too early. */
1648 /* Functions need the lang_decl data. */
1649 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1650 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1652 /* A local extern declaration for a function doesn't constitute nesting.
1653 A local auto declaration does, since it's a forward decl
1654 for a nested function coming later. */
1655 if (current_function_decl == NULL
1656 || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1657 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
1658 DECL_CONTEXT (x) = current_file_decl;
1660 DECL_CONTEXT (x) = current_function_decl;
1666 if (warn_nested_externs
1667 && scope != global_scope
1668 && DECL_EXTERNAL (x)
1669 && !DECL_IN_SYSTEM_HEADER (x))
1670 warning ("nested extern declaration of `%s'",
1671 IDENTIFIER_POINTER (name));
1673 old = lookup_name_current_level (name);
1674 if (old && duplicate_decls (x, old))
1676 /* For PARM_DECLs, old may be a forward declaration.
1677 If so, we want to remove it from its old location
1678 (in the variables chain) and rechain it in the
1679 location given by the new declaration. */
1680 if (TREE_CODE (x) == PARM_DECL)
1683 for (p = &scope->names; *p; p = &TREE_CHAIN (*p))
1686 *p = TREE_CHAIN (old);
1687 SCOPE_LIST_APPEND (scope, parms, old);
1693 if (DECL_EXTERNAL (x) || scope == global_scope)
1695 /* Find and check against a previous, not-in-scope, external
1696 decl for this identifier. (C99 6.2.7p2: All declarations
1697 that refer to the same object or function shall have
1698 compatible type; otherwise, the behavior is undefined.) */
1699 tree ext = any_external_decl (name);
1702 if (duplicate_decls (x, ext))
1704 /* XXX This copy_node call violates the basic
1705 assumption that there is only one DECL for any
1706 given object. This causes all sorts of problems
1707 elsewhere. To correct it we must stop chaining
1708 DECLs directly within the scope structure (work
1709 in progress). -zw 2004-03-05 */
1710 x = copy_node (ext);
1712 /* Kludge around one of the worst consequences of
1713 the above copy_node call, viz. that the arg_info
1714 block created by get_parm_info can survive in a
1715 copied FUNCTION_DECL after store_parm_decls is
1716 done with it, and confuse the debug info
1718 if (TREE_CODE (ext) == FUNCTION_DECL
1719 && DECL_ARGUMENTS (ext)
1720 && TREE_CODE (DECL_ARGUMENTS (ext)) == TREE_LIST)
1721 DECL_ARGUMENTS (ext) = 0;
1725 record_external_decl (x);
1728 if (TREE_CODE (x) == TYPE_DECL)
1729 clone_underlying_type (x);
1731 /* If storing a local value, there may already be one
1732 (inherited). If so, record it for restoration when this
1733 scope ends. Take care not to do this if we are replacing an
1734 older decl in the same scope (i.e. duplicate_decls returned
1736 if (scope != global_scope
1737 && IDENTIFIER_SYMBOL_VALUE (name)
1738 && IDENTIFIER_SYMBOL_VALUE (name) != old)
1740 warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
1741 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1745 /* Install the new declaration in the requested scope. */
1746 IDENTIFIER_SYMBOL_VALUE (name) = x;
1747 C_DECL_INVISIBLE (x) = 0;
1749 /* If x's type is incomplete because it's based on a
1750 structure or union which has not yet been fully declared,
1751 attach it to that structure or union type, so we can go
1752 back and complete the variable declaration later, if the
1753 structure or union gets fully declared.
1755 If the input is erroneous, we can have error_mark in the type
1756 slot (e.g. "f(void a, ...)") - that doesn't count as an
1758 if (TREE_TYPE (x) != error_mark_node
1759 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1761 tree element = TREE_TYPE (x);
1763 while (TREE_CODE (element) == ARRAY_TYPE)
1764 element = TREE_TYPE (element);
1765 element = TYPE_MAIN_VARIANT (element);
1767 if ((TREE_CODE (element) == RECORD_TYPE
1768 || TREE_CODE (element) == UNION_TYPE)
1769 && (TREE_CODE (x) != TYPE_DECL
1770 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
1771 && !COMPLETE_TYPE_P (element))
1772 C_TYPE_INCOMPLETE_VARS (element)
1773 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
1777 if (TREE_CODE (x) == PARM_DECL)
1778 SCOPE_LIST_APPEND (scope, parms, x);
1780 SCOPE_LIST_APPEND (scope, names, x);
1785 /* Record X as belonging to the global scope (C99 "file scope").
1786 This is used only internally by the Objective-C front end,
1787 and is limited to its needs. duplicate_decls is not called;
1788 if there is any preexisting decl for this identifier, it is an ICE. */
1791 pushdecl_top_level (tree x)
1795 if (TREE_CODE (x) != VAR_DECL)
1798 name = DECL_NAME (x);
1800 if (IDENTIFIER_SYMBOL_VALUE (name))
1803 DECL_CONTEXT (x) = current_file_decl;
1804 IDENTIFIER_SYMBOL_VALUE (name) = x;
1806 SCOPE_LIST_APPEND (global_scope, names, x);
1810 /* Generate an implicit declaration for identifier FUNCTIONID as a
1811 function of type int (). */
1814 implicitly_declare (tree functionid)
1816 tree decl = any_external_decl (functionid);
1820 /* Implicit declaration of a function already declared
1821 (somehow) in a different scope, or as a built-in.
1822 If this is the first time this has happened, warn;
1823 then recycle the old declaration. */
1824 if (!C_DECL_IMPLICIT (decl))
1826 implicit_decl_warning (DECL_NAME (decl));
1827 if (! DECL_FILE_SCOPE_P (decl))
1828 warning ("%Jprevious declaration of '%D'", decl, decl);
1829 C_DECL_IMPLICIT (decl) = 1;
1831 /* If this function is global, then it must already be in the
1832 global scope, so there's no need to push it again. */
1833 if (current_scope == global_scope)
1835 /* If this is a local declaration, make a copy; we can't have
1836 the same DECL listed in two different scopes. */
1837 return pushdecl (copy_node (decl));
1840 /* Not seen before. */
1841 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1842 DECL_EXTERNAL (decl) = 1;
1843 TREE_PUBLIC (decl) = 1;
1844 C_DECL_IMPLICIT (decl) = 1;
1845 implicit_decl_warning (functionid);
1847 /* C89 says implicit declarations are in the innermost block.
1848 So we record the decl in the standard fashion. */
1849 decl = pushdecl (decl);
1851 /* No need to call objc_check_decl here - it's a function type. */
1852 rest_of_decl_compilation (decl, NULL, 0, 0);
1854 /* Write a record describing this implicit function declaration
1855 to the prototypes file (if requested). */
1856 gen_aux_info_record (decl, 0, 1, 0);
1858 /* Possibly apply some default attributes to this implicit declaration. */
1859 decl_attributes (&decl, NULL_TREE, 0);
1865 implicit_decl_warning (tree id)
1867 const char *name = IDENTIFIER_POINTER (id);
1868 if (mesg_implicit_function_declaration == 2)
1869 error ("implicit declaration of function `%s'", name);
1870 else if (mesg_implicit_function_declaration == 1)
1871 warning ("implicit declaration of function `%s'", name);
1874 /* Issue an error message for a reference to an undeclared variable
1875 ID, including a reference to a builtin outside of function-call
1876 context. Establish a binding of the identifier to error_mark_node
1877 in an appropriate scope, which will suppress further errors for the
1880 undeclared_variable (tree id)
1882 static bool already = false;
1883 struct c_scope *scope;
1885 if (current_function_decl == 0)
1887 error ("`%s' undeclared here (not in a function)",
1888 IDENTIFIER_POINTER (id));
1889 scope = current_scope;
1893 error ("`%s' undeclared (first use in this function)",
1894 IDENTIFIER_POINTER (id));
1898 error ("(Each undeclared identifier is reported only once");
1899 error ("for each function it appears in.)");
1903 scope = current_function_scope;
1906 scope->shadowed = tree_cons (id, IDENTIFIER_SYMBOL_VALUE (id),
1908 IDENTIFIER_SYMBOL_VALUE (id) = error_mark_node;
1911 /* Subroutine of lookup_label, declare_label, define_label: construct a
1912 LABEL_DECL with all the proper frills. */
1915 make_label (tree name, location_t location)
1917 tree label = build_decl (LABEL_DECL, name, void_type_node);
1919 DECL_CONTEXT (label) = current_function_decl;
1920 DECL_MODE (label) = VOIDmode;
1921 DECL_SOURCE_LOCATION (label) = location;
1926 /* Another subroutine of lookup_label, declare_label, define_label:
1927 set up the binding of name to LABEL_DECL in the given SCOPE. */
1930 bind_label (tree name, tree label, struct c_scope *scope)
1932 if (IDENTIFIER_LABEL_VALUE (name))
1933 scope->shadowed = tree_cons (name, IDENTIFIER_LABEL_VALUE (name),
1935 IDENTIFIER_LABEL_VALUE (name) = label;
1937 SCOPE_LIST_APPEND (scope, names, label);
1940 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
1941 Create one if none exists so far for the current function.
1942 This is called when a label is used in a goto expression or
1943 has its address taken. */
1946 lookup_label (tree name)
1950 if (current_function_decl == 0)
1952 error ("label %s referenced outside of any function",
1953 IDENTIFIER_POINTER (name));
1957 /* Use a label already defined or ref'd with this name, but not if
1958 it is inherited from a containing function and wasn't declared
1960 label = IDENTIFIER_LABEL_VALUE (name);
1961 if (label && (DECL_CONTEXT (label) == current_function_decl
1962 || C_DECLARED_LABEL_FLAG (label)))
1964 /* If the label has only been declared, update its apparent
1965 location to point here, for better diagnostics if it
1966 turns out not to have been defined. */
1967 if (!TREE_USED (label))
1968 DECL_SOURCE_LOCATION (label) = input_location;
1972 /* No label binding for that identifier; make one. */
1973 label = make_label (name, input_location);
1975 /* Ordinary labels go in the current function scope. */
1976 bind_label (name, label, current_function_scope);
1980 /* Make a label named NAME in the current function, shadowing silently
1981 any that may be inherited from containing functions or containing
1982 scopes. This is called for __label__ declarations. */
1984 /* Note that valid use, if the label being shadowed comes from another
1985 scope in the same function, requires calling declare_nonlocal_label
1986 right away. (Is this still true? -zw 2003-07-17) */
1989 declare_label (tree name)
1991 tree label = IDENTIFIER_LABEL_VALUE (name);
1994 /* Check to make sure that the label hasn't already been declared
1996 for (dup = current_scope->names; dup; dup = TREE_CHAIN (dup))
1999 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2000 error ("%Jthis is a previous declaration", dup);
2002 /* Just use the previous declaration. */
2006 label = make_label (name, input_location);
2007 C_DECLARED_LABEL_FLAG (label) = 1;
2009 /* Declared labels go in the current scope. */
2010 bind_label (name, label, current_scope);
2014 /* Define a label, specifying the location in the source file.
2015 Return the LABEL_DECL node for the label, if the definition is valid.
2016 Otherwise return 0. */
2019 define_label (location_t location, tree name)
2023 /* Find any preexisting label with this name. It is an error
2024 if that label has already been defined in this function, or
2025 if there is a containing function with a declared label with
2027 label = IDENTIFIER_LABEL_VALUE (name);
2030 && ((DECL_CONTEXT (label) == current_function_decl
2031 && DECL_INITIAL (label) != 0)
2032 || (DECL_CONTEXT (label) != current_function_decl
2033 && C_DECLARED_LABEL_FLAG (label))))
2035 error ("%Hduplicate label `%D'", &location, label);
2036 if (DECL_INITIAL (label))
2037 error ("%J`%D' previously defined here", label, label);
2039 error ("%J`%D' previously declared here", label, label);
2042 else if (label && DECL_CONTEXT (label) == current_function_decl)
2044 /* The label has been used or declared already in this function,
2045 but not defined. Update its location to point to this
2047 DECL_SOURCE_LOCATION (label) = location;
2051 /* No label binding for that identifier; make one. */
2052 label = make_label (name, location);
2054 /* Ordinary labels go in the current function scope. */
2055 bind_label (name, label, current_function_scope);
2058 if (warn_traditional && !in_system_header && lookup_name (name))
2059 warning ("%Htraditional C lacks a separate namespace for labels, "
2060 "identifier `%s' conflicts", &location,
2061 IDENTIFIER_POINTER (name));
2063 /* Mark label as having been defined. */
2064 DECL_INITIAL (label) = error_mark_node;
2068 /* Return the list of declarations of the current scope.
2069 This hook is optional and not implemented for C. */
2078 /* Given NAME, an IDENTIFIER_NODE,
2079 return the structure (or union or enum) definition for that name.
2080 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2081 CODE says which kind of type the caller wants;
2082 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2083 If the wrong kind of type is found, an error is reported. */
2086 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2088 tree tag = IDENTIFIER_TAG_VALUE (name);
2094 /* We only care about whether it's in this level if
2095 thislevel_only was set or it might be a type clash. */
2096 if (thislevel_only || TREE_CODE (tag) != code)
2098 if (current_scope == global_scope
2099 || purpose_member (name, current_scope->tags))
2103 if (thislevel_only && !thislevel)
2106 if (TREE_CODE (tag) != code)
2108 /* Definition isn't the kind we were looking for. */
2109 pending_invalid_xref = name;
2110 pending_invalid_xref_location = input_location;
2112 /* If in the same binding level as a declaration as a tag
2113 of a different type, this must not be allowed to
2114 shadow that tag, so give the error immediately.
2115 (For example, "struct foo; union foo;" is invalid.) */
2117 pending_xref_error ();
2122 /* Print an error message now
2123 for a recent invalid struct, union or enum cross reference.
2124 We don't print them immediately because they are not invalid
2125 when used in the `struct foo;' construct for shadowing. */
2128 pending_xref_error (void)
2130 if (pending_invalid_xref != 0)
2131 error ("%H`%s' defined as wrong kind of tag",
2132 &pending_invalid_xref_location,
2133 IDENTIFIER_POINTER (pending_invalid_xref));
2134 pending_invalid_xref = 0;
2138 /* Look up NAME in the current scope and its superiors
2139 in the namespace of variables, functions and typedefs.
2140 Return a ..._DECL node of some kind representing its definition,
2141 or return 0 if it is undefined. */
2144 lookup_name (tree name)
2146 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2147 if (decl == 0 || decl == error_mark_node)
2149 if (C_DECL_INVISIBLE (decl))
2154 /* Similar to `lookup_name' but look only at the current scope. */
2157 lookup_name_current_level (tree name)
2159 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2161 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2164 if (current_scope == global_scope)
2167 /* Scan the current scope for a decl with name NAME.
2168 For PARM_DECLs, we have to look at both ->parms and ->names, since
2169 forward parameter declarations wind up on the ->names list. */
2170 if (TREE_CODE (decl) == PARM_DECL
2171 && chain_member (decl, current_scope->parms))
2173 if (chain_member (decl, current_scope->names))
2179 /* Create the predefined scalar types of C,
2180 and some nodes representing standard constants (0, 1, (void *) 0).
2181 Initialize the global scope.
2182 Make definitions for built-in primitive functions. */
2185 c_init_decl_processing (void)
2188 tree ptr_ftype_void, ptr_ftype_ptr;
2189 location_t save_loc = input_location;
2191 /* Adds some ggc roots, and reserved words for c-parse.in. */
2194 current_function_decl = 0;
2196 /* Make the c_scope structure for global names. */
2198 global_scope = current_scope;
2200 /* Declarations from c_common_nodes_and_builtins must not be associated
2201 with this input file, lest we get differences between using and not
2202 using preprocessed headers. */
2203 input_location.file = "<internal>";
2204 input_location.line = 0;
2206 /* Make the DECL for the toplevel file scope. */
2207 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
2209 build_common_tree_nodes (flag_signed_char);
2211 c_common_nodes_and_builtins ();
2213 /* In C, comparisons and TRUTH_* expressions have type int. */
2214 truthvalue_type_node = integer_type_node;
2215 truthvalue_true_node = integer_one_node;
2216 truthvalue_false_node = integer_zero_node;
2218 /* Even in C99, which has a real boolean type. */
2219 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2220 boolean_type_node));
2222 endlink = void_list_node;
2223 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2225 = build_function_type (ptr_type_node,
2226 tree_cons (NULL_TREE, ptr_type_node, endlink));
2228 input_location = save_loc;
2230 pedantic_lvalues = true;
2232 make_fname_decl = c_make_fname_decl;
2233 start_fname_decls ();
2235 first_builtin_decl = global_scope->names;
2236 last_builtin_decl = global_scope->names_last;
2239 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2240 decl, NAME is the initialization string and TYPE_DEP indicates whether
2241 NAME depended on the type of the function. As we don't yet implement
2242 delayed emission of static data, we mark the decl as emitted
2243 so it is not placed in the output. Anything using it must therefore pull
2244 out the STRING_CST initializer directly. FIXME. */
2247 c_make_fname_decl (tree id, int type_dep)
2249 const char *name = fname_as_string (type_dep);
2250 tree decl, type, init;
2251 size_t length = strlen (name);
2253 type = build_array_type
2254 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2255 build_index_type (size_int (length)));
2257 decl = build_decl (VAR_DECL, id, type);
2259 TREE_STATIC (decl) = 1;
2260 TREE_READONLY (decl) = 1;
2261 DECL_ARTIFICIAL (decl) = 1;
2263 init = build_string (length + 1, name);
2264 TREE_TYPE (init) = type;
2265 DECL_INITIAL (decl) = init;
2267 TREE_USED (decl) = 1;
2269 if (current_function_decl)
2271 DECL_CONTEXT (decl) = current_function_decl;
2272 IDENTIFIER_SYMBOL_VALUE (id) = decl;
2273 SCOPE_LIST_APPEND (current_function_scope, names, decl);
2276 finish_decl (decl, init, NULL_TREE);
2281 /* Return a definition for a builtin function named NAME and whose data type
2282 is TYPE. TYPE should be a function type with argument types.
2283 FUNCTION_CODE tells later passes how to compile calls to this function.
2284 See tree.h for its possible values.
2286 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2287 the name to be called if we can't opencode the function. If
2288 ATTRS is nonzero, use that for the function's attribute list. */
2291 builtin_function (const char *name, tree type, int function_code,
2292 enum built_in_class class, const char *library_name,
2295 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2296 DECL_EXTERNAL (decl) = 1;
2297 TREE_PUBLIC (decl) = 1;
2299 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2300 make_decl_rtl (decl, NULL);
2302 DECL_BUILT_IN_CLASS (decl) = class;
2303 DECL_FUNCTION_CODE (decl) = function_code;
2305 /* Warn if a function in the namespace for users
2306 is used without an occasion to consider it declared. */
2307 if (name[0] != '_' || name[1] != '_')
2308 C_DECL_INVISIBLE (decl) = 1;
2310 /* Possibly apply some default attributes to this built-in function. */
2312 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2314 decl_attributes (&decl, NULL_TREE, 0);
2319 /* Called when a declaration is seen that contains no names to declare.
2320 If its type is a reference to a structure, union or enum inherited
2321 from a containing scope, shadow that tag name for the current scope
2322 with a forward reference.
2323 If its type defines a new named structure or union
2324 or defines an enum, it is valid but we need not do anything here.
2325 Otherwise, it is an error. */
2328 shadow_tag (tree declspecs)
2330 shadow_tag_warned (declspecs, 0);
2334 shadow_tag_warned (tree declspecs, int warned)
2337 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2344 pending_invalid_xref = 0;
2346 /* Remove the attributes from declspecs, since they will confuse the
2348 split_specs_attrs (declspecs, &specs, &attrs);
2350 for (link = specs; link; link = TREE_CHAIN (link))
2352 tree value = TREE_VALUE (link);
2353 enum tree_code code = TREE_CODE (value);
2355 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2356 /* Used to test also that TYPE_SIZE (value) != 0.
2357 That caused warning for `struct foo;' at top level in the file. */
2359 tree name = TYPE_NAME (value);
2366 if (warned != 1 && code != ENUMERAL_TYPE)
2367 /* Empty unnamed enum OK */
2369 pedwarn ("unnamed struct/union that defines no instances");
2375 t = lookup_tag (code, name, 1);
2379 t = make_node (code);
2386 if (!warned && ! in_system_header)
2388 warning ("useless keyword or type name in empty declaration");
2395 error ("two types specified in one empty declaration");
2400 pedwarn ("empty declaration");
2404 /* Construct an array declarator. EXPR is the expression inside [], or
2405 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2406 to the pointer to which a parameter array is converted). STATIC_P is
2407 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2408 is nonzero is the array is [*], a VLA of unspecified length which is
2409 nevertheless a complete type (not currently implemented by GCC),
2410 zero otherwise. The declarator is constructed as an ARRAY_REF
2411 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2412 left of the [] (filled by in set_array_declarator_type) and operand 1
2413 is the expression inside; whose TREE_TYPE is the type qualifiers and
2414 which has TREE_STATIC set if "static" is used. */
2417 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2420 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2421 TREE_TYPE (decl) = quals;
2422 TREE_STATIC (decl) = (static_p ? 1 : 0);
2423 if (pedantic && !flag_isoc99)
2425 if (static_p || quals != NULL_TREE)
2426 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2428 pedwarn ("ISO C90 does not support `[*]' array declarators");
2431 warning ("GCC does not yet properly implement `[*]' array declarators");
2435 /* Set the type of an array declarator. DECL is the declarator, as
2436 constructed by build_array_declarator; TYPE is what appears on the left
2437 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2438 abstract declarator, zero otherwise; this is used to reject static and
2439 type qualifiers in abstract declarators, where they are not in the
2443 set_array_declarator_type (tree decl, tree type, int abstract_p)
2445 TREE_OPERAND (decl, 0) = type;
2446 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2447 error ("static or type qualifiers in abstract declarator");
2451 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2454 groktypename (tree typename)
2458 if (TREE_CODE (typename) != TREE_LIST)
2461 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2463 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0,
2466 /* Apply attributes. */
2467 decl_attributes (&typename, attrs, 0);
2472 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2475 groktypename_in_parm_context (tree typename)
2477 if (TREE_CODE (typename) != TREE_LIST)
2479 return grokdeclarator (TREE_VALUE (typename),
2480 TREE_PURPOSE (typename),
2484 /* Decode a declarator in an ordinary declaration or data definition.
2485 This is called as soon as the type information and variable name
2486 have been parsed, before parsing the initializer if any.
2487 Here we create the ..._DECL node, fill in its type,
2488 and put it on the list of decls for the current context.
2489 The ..._DECL node is returned as the value.
2491 Exception: for arrays where the length is not specified,
2492 the type is left null, to be filled in by `finish_decl'.
2494 Function definitions do not come here; they go to start_function
2495 instead. However, external and forward declarations of functions
2496 do go through here. Structure field declarations are done by
2497 grokfield and not through here. */
2500 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2505 /* An object declared as __attribute__((deprecated)) suppresses
2506 warnings of uses of other deprecated items. */
2507 if (lookup_attribute ("deprecated", attributes))
2508 deprecated_state = DEPRECATED_SUPPRESS;
2510 decl = grokdeclarator (declarator, declspecs,
2511 NORMAL, initialized, NULL);
2513 deprecated_state = DEPRECATED_NORMAL;
2515 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2516 && MAIN_NAME_P (DECL_NAME (decl)))
2517 warning ("%J'%D' is usually a function", decl, decl);
2520 /* Is it valid for this decl to have an initializer at all?
2521 If not, set INITIALIZED to zero, which will indirectly
2522 tell `finish_decl' to ignore the initializer once it is parsed. */
2523 switch (TREE_CODE (decl))
2526 error ("typedef `%s' is initialized (use __typeof__ instead)",
2527 IDENTIFIER_POINTER (DECL_NAME (decl)));
2532 error ("function `%s' is initialized like a variable",
2533 IDENTIFIER_POINTER (DECL_NAME (decl)));
2538 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2539 error ("parameter `%s' is initialized",
2540 IDENTIFIER_POINTER (DECL_NAME (decl)));
2545 /* Don't allow initializations for incomplete types
2546 except for arrays which might be completed by the initialization. */
2548 /* This can happen if the array size is an undefined macro. We already
2549 gave a warning, so we don't need another one. */
2550 if (TREE_TYPE (decl) == error_mark_node)
2552 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2554 /* A complete type is ok if size is fixed. */
2556 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2557 || C_DECL_VARIABLE_SIZE (decl))
2559 error ("variable-sized object may not be initialized");
2563 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2565 error ("variable `%s' has initializer but incomplete type",
2566 IDENTIFIER_POINTER (DECL_NAME (decl)));
2569 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2571 error ("elements of array `%s' have incomplete type",
2572 IDENTIFIER_POINTER (DECL_NAME (decl)));
2579 DECL_EXTERNAL (decl) = 0;
2580 if (current_scope == global_scope)
2581 TREE_STATIC (decl) = 1;
2583 /* Tell `pushdecl' this is an initialized decl
2584 even though we don't yet have the initializer expression.
2585 Also tell `finish_decl' it may store the real initializer. */
2586 DECL_INITIAL (decl) = error_mark_node;
2589 /* If this is a function declaration, write a record describing it to the
2590 prototypes file (if requested). */
2592 if (TREE_CODE (decl) == FUNCTION_DECL)
2593 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2595 /* ANSI specifies that a tentative definition which is not merged with
2596 a non-tentative definition behaves exactly like a definition with an
2597 initializer equal to zero. (Section 3.7.2)
2599 -fno-common gives strict ANSI behavior, though this tends to break
2600 a large body of code that grew up without this rule.
2602 Thread-local variables are never common, since there's no entrenched
2603 body of code to break, and it allows more efficient variable references
2604 in the presence of dynamic linking. */
2606 if (TREE_CODE (decl) == VAR_DECL
2608 && TREE_PUBLIC (decl)
2609 && !DECL_THREAD_LOCAL (decl)
2611 DECL_COMMON (decl) = 1;
2613 /* Set attributes here so if duplicate decl, will have proper attributes. */
2614 decl_attributes (&decl, attributes, 0);
2616 if (TREE_CODE (decl) == FUNCTION_DECL
2617 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2619 tree ce = declarator;
2621 if (TREE_CODE (ce) == INDIRECT_REF)
2622 ce = TREE_OPERAND (declarator, 0);
2623 if (TREE_CODE (ce) == CALL_EXPR)
2625 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2626 for (; args; args = TREE_CHAIN (args))
2628 tree type = TREE_TYPE (args);
2629 if (INTEGRAL_TYPE_P (type)
2630 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2631 DECL_ARG_TYPE (args) = integer_type_node;
2636 if (TREE_CODE (decl) == FUNCTION_DECL
2637 && DECL_DECLARED_INLINE_P (decl)
2638 && DECL_UNINLINABLE (decl)
2639 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2640 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2642 /* Add this decl to the current scope.
2643 TEM may equal DECL or it may be a previous decl of the same name. */
2644 tem = pushdecl (decl);
2646 /* For a local variable, define the RTL now. */
2647 if (current_scope != global_scope
2648 /* But not if this is a duplicate decl
2649 and we preserved the rtl from the previous one
2650 (which may or may not happen). */
2651 && !DECL_RTL_SET_P (tem)
2652 && DECL_FILE_SCOPE_P (tem))
2654 if (TREE_TYPE (tem) != error_mark_node
2655 && (COMPLETE_TYPE_P (TREE_TYPE (tem))
2656 || (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2657 && DECL_INITIAL (tem) != 0)))
2664 /* Finish processing of a declaration;
2665 install its initial value.
2666 If the length of an array type is not known before,
2667 it must be determined now, from the initial value, or it is an error. */
2670 finish_decl (tree decl, tree init, tree asmspec_tree)
2672 tree type = TREE_TYPE (decl);
2673 int was_incomplete = (DECL_SIZE (decl) == 0);
2674 const char *asmspec = 0;
2676 /* If a name was specified, get the string. */
2677 if (current_scope == global_scope)
2678 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2680 asmspec = TREE_STRING_POINTER (asmspec_tree);
2682 /* If `start_decl' didn't like having an initialization, ignore it now. */
2683 if (init != 0 && DECL_INITIAL (decl) == 0)
2686 /* Don't crash if parm is initialized. */
2687 if (TREE_CODE (decl) == PARM_DECL)
2691 store_init_value (decl, init);
2693 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
2694 || TREE_CODE (decl) == FUNCTION_DECL
2695 || TREE_CODE (decl) == FIELD_DECL))
2696 objc_check_decl (decl);
2698 /* Deduce size of array from initialization, if not already known. */
2699 if (TREE_CODE (type) == ARRAY_TYPE
2700 && TYPE_DOMAIN (type) == 0
2701 && TREE_CODE (decl) != TYPE_DECL)
2704 = (TREE_STATIC (decl)
2705 /* Even if pedantic, an external linkage array
2706 may have incomplete type at first. */
2707 ? pedantic && !TREE_PUBLIC (decl)
2708 : !DECL_EXTERNAL (decl));
2710 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2712 /* Get the completed type made by complete_array_type. */
2713 type = TREE_TYPE (decl);
2716 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2718 else if (failure == 2)
2721 error ("%Jarray size missing in '%D'", decl, decl);
2722 /* If a `static' var's size isn't known,
2723 make it extern as well as static, so it does not get
2725 If it is not `static', then do not mark extern;
2726 finish_incomplete_decl will give it a default size
2727 and it will get allocated. */
2728 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2729 DECL_EXTERNAL (decl) = 1;
2732 /* TYPE_MAX_VALUE is always one less than the number of elements
2733 in the array, because we start counting at zero. Therefore,
2734 warn only if the value is less than zero. */
2735 else if (pedantic && TYPE_DOMAIN (type) != 0
2736 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2737 error ("%Jzero or negative size array '%D'", decl, decl);
2739 layout_decl (decl, 0);
2742 if (TREE_CODE (decl) == VAR_DECL)
2744 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2745 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2746 layout_decl (decl, 0);
2748 if (DECL_SIZE (decl) == 0
2749 /* Don't give an error if we already gave one earlier. */
2750 && TREE_TYPE (decl) != error_mark_node
2751 && (TREE_STATIC (decl)
2753 /* A static variable with an incomplete type
2754 is an error if it is initialized.
2755 Also if it is not file scope.
2756 Otherwise, let it through, but if it is not `extern'
2757 then it may cause an error message later. */
2758 (DECL_INITIAL (decl) != 0
2759 || !DECL_FILE_SCOPE_P (decl))
2761 /* An automatic variable with an incomplete type
2763 !DECL_EXTERNAL (decl)))
2765 error ("%Jstorage size of '%D' isn't known", decl, decl);
2766 TREE_TYPE (decl) = error_mark_node;
2769 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2770 && DECL_SIZE (decl) != 0)
2772 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2773 constant_expression_warning (DECL_SIZE (decl));
2775 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2778 if (TREE_USED (type))
2779 TREE_USED (decl) = 1;
2782 /* If this is a function and an assembler name is specified, reset DECL_RTL
2783 so we can give it its new name. Also, update built_in_decls if it
2784 was a normal built-in. */
2785 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2787 /* ASMSPEC is given, and not the name of a register. Mark the
2788 name with a star so assemble_name won't munge it. */
2789 char *starred = alloca (strlen (asmspec) + 2);
2791 strcpy (starred + 1, asmspec);
2793 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2795 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2796 SET_DECL_RTL (builtin, NULL_RTX);
2797 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2798 #ifdef TARGET_MEM_FUNCTIONS
2799 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2800 init_block_move_fn (starred);
2801 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2802 init_block_clear_fn (starred);
2804 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2805 init_block_move_fn (starred);
2806 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2807 init_block_clear_fn (starred);
2810 SET_DECL_RTL (decl, NULL_RTX);
2811 change_decl_assembler_name (decl, get_identifier (starred));
2814 /* If #pragma weak was used, mark the decl weak now. */
2815 if (current_scope == global_scope)
2816 maybe_apply_pragma_weak (decl);
2818 /* Output the assembler code and/or RTL code for variables and functions,
2819 unless the type is an undefined structure or union.
2820 If not, it will get done when the type is completed. */
2822 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2824 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2825 if (c_dialect_objc ())
2826 objc_check_decl (decl);
2828 if (DECL_FILE_SCOPE_P (decl))
2830 if (DECL_INITIAL (decl) == NULL_TREE
2831 || DECL_INITIAL (decl) == error_mark_node)
2832 /* Don't output anything
2833 when a tentative file-scope definition is seen.
2834 But at end of compilation, do output code for them. */
2835 DECL_DEFER_OUTPUT (decl) = 1;
2836 rest_of_decl_compilation (decl, asmspec, true, 0);
2840 /* This is a local variable. If there is an ASMSPEC, the
2841 user has requested that we handle it specially. */
2844 /* In conjunction with an ASMSPEC, the `register'
2845 keyword indicates that we should place the variable
2846 in a particular register. */
2847 if (DECL_REGISTER (decl))
2848 DECL_C_HARD_REGISTER (decl) = 1;
2850 /* If this is not a static variable, issue a warning.
2851 It doesn't make any sense to give an ASMSPEC for an
2852 ordinary, non-register local variable. Historically,
2853 GCC has accepted -- but ignored -- the ASMSPEC in
2855 if (TREE_CODE (decl) == VAR_DECL
2856 && !DECL_REGISTER (decl)
2857 && !TREE_STATIC (decl))
2858 warning ("%Jignoring asm-specifier for non-static local "
2859 "variable '%D'", decl, decl);
2861 change_decl_assembler_name (decl, get_identifier (asmspec));
2864 if (TREE_CODE (decl) != FUNCTION_DECL)
2865 add_decl_stmt (decl);
2868 if (!DECL_FILE_SCOPE_P (decl))
2870 /* Recompute the RTL of a local array now
2871 if it used to be an incomplete type. */
2873 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2875 /* If we used it already as memory, it must stay in memory. */
2876 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2877 /* If it's still incomplete now, no init will save it. */
2878 if (DECL_SIZE (decl) == 0)
2879 DECL_INITIAL (decl) = 0;
2884 /* If this was marked 'used', be sure it will be output. */
2885 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2886 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2888 if (TREE_CODE (decl) == TYPE_DECL)
2889 rest_of_decl_compilation (decl, NULL, DECL_FILE_SCOPE_P (decl), 0);
2891 /* At the end of a declaration, throw away any variable type sizes
2892 of types defined inside that declaration. There is no use
2893 computing them in the following function definition. */
2894 if (current_scope == global_scope)
2895 get_pending_sizes ();
2897 /* Install a cleanup (aka destructor) if one was given. */
2898 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2900 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2903 static bool eh_initialized_p;
2905 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2906 tree cleanup_decl = lookup_name (cleanup_id);
2909 /* Build "cleanup(&decl)" for the destructor. */
2910 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2911 cleanup = build_tree_list (NULL_TREE, cleanup);
2912 cleanup = build_function_call (cleanup_decl, cleanup);
2914 /* Don't warn about decl unused; the cleanup uses it. */
2915 TREE_USED (decl) = 1;
2917 /* Initialize EH, if we've been told to do so. */
2918 if (flag_exceptions && !eh_initialized_p)
2920 eh_initialized_p = true;
2921 eh_personality_libfunc
2922 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
2923 ? "__gcc_personality_sj0"
2924 : "__gcc_personality_v0");
2925 using_eh_for_cleanups ();
2928 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
2933 /* Given a parsed parameter declaration, decode it into a PARM_DECL
2934 and push that on the current scope. */
2937 push_parm_decl (tree parm)
2941 /* Don't attempt to expand sizes while parsing this decl.
2942 (We can get here with i_s_e 1 somehow from Objective-C.) */
2943 int save_immediate_size_expand = immediate_size_expand;
2944 immediate_size_expand = 0;
2946 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
2947 TREE_PURPOSE (TREE_PURPOSE (parm)),
2949 decl_attributes (&decl, TREE_VALUE (parm), 0);
2951 decl = pushdecl (decl);
2953 finish_decl (decl, NULL_TREE, NULL_TREE);
2955 immediate_size_expand = save_immediate_size_expand;
2958 /* Mark all the parameter declarations to date as forward decls,
2959 shift them to the variables list, and reset the parameters list.
2960 Also diagnose use of this extension. */
2963 mark_forward_parm_decls (void)
2967 if (pedantic && !current_scope->warned_forward_parm_decls)
2969 pedwarn ("ISO C forbids forward parameter declarations");
2970 current_scope->warned_forward_parm_decls = true;
2973 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
2974 TREE_ASM_WRITTEN (parm) = 1;
2976 SCOPE_LIST_CONCAT (current_scope, names, current_scope, parms);
2977 current_scope->parms = 0;
2978 current_scope->parms_last = 0;
2981 static GTY(()) int compound_literal_number;
2983 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
2984 literal, which may be an incomplete array type completed by the
2985 initializer; INIT is a CONSTRUCTOR that initializes the compound
2989 build_compound_literal (tree type, tree init)
2991 /* We do not use start_decl here because we have a type, not a declarator;
2992 and do not use finish_decl because the decl should be stored inside
2993 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
2994 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
2997 DECL_EXTERNAL (decl) = 0;
2998 TREE_PUBLIC (decl) = 0;
2999 TREE_STATIC (decl) = (current_scope == global_scope);
3000 DECL_CONTEXT (decl) = current_function_decl;
3001 TREE_USED (decl) = 1;
3002 TREE_TYPE (decl) = type;
3003 TREE_READONLY (decl) = TREE_READONLY (type);
3004 store_init_value (decl, init);
3006 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3008 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3013 type = TREE_TYPE (decl);
3014 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3015 return error_mark_node;
3017 stmt = build_stmt (DECL_STMT, decl);
3018 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3019 TREE_SIDE_EFFECTS (complit) = 1;
3021 layout_decl (decl, 0);
3023 if (TREE_STATIC (decl))
3025 /* This decl needs a name for the assembler output. We also need
3026 a unique suffix to be added to the name. */
3029 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3030 compound_literal_number);
3031 compound_literal_number++;
3032 DECL_NAME (decl) = get_identifier (name);
3033 DECL_DEFER_OUTPUT (decl) = 1;
3034 DECL_COMDAT (decl) = 1;
3035 DECL_ARTIFICIAL (decl) = 1;
3037 rest_of_decl_compilation (decl, NULL, 1, 0);
3043 /* Make TYPE a complete type based on INITIAL_VALUE.
3044 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3045 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3048 complete_array_type (tree type, tree initial_value, int do_default)
3050 tree maxindex = NULL_TREE;
3055 /* Note MAXINDEX is really the maximum index,
3056 one less than the size. */
3057 if (TREE_CODE (initial_value) == STRING_CST)
3060 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3061 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3064 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3066 tree elts = CONSTRUCTOR_ELTS (initial_value);
3067 maxindex = build_int_2 (-1, -1);
3068 for (; elts; elts = TREE_CHAIN (elts))
3070 if (TREE_PURPOSE (elts))
3071 maxindex = TREE_PURPOSE (elts);
3073 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3074 maxindex, integer_one_node));
3076 maxindex = copy_node (maxindex);
3080 /* Make an error message unless that happened already. */
3081 if (initial_value != error_mark_node)
3084 /* Prevent further error messages. */
3085 maxindex = build_int_2 (0, 0);
3092 maxindex = build_int_2 (0, 0);
3098 TYPE_DOMAIN (type) = build_index_type (maxindex);
3099 if (!TREE_TYPE (maxindex))
3100 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3103 /* Lay out the type now that we can get the real answer. */
3110 /* Determine whether TYPE is a structure with a flexible array member,
3111 or a union containing such a structure (possibly recursively). */
3114 flexible_array_type_p (tree type)
3117 switch (TREE_CODE (type))
3120 x = TYPE_FIELDS (type);
3123 while (TREE_CHAIN (x) != NULL_TREE)
3125 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3126 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3127 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3128 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3132 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3134 if (flexible_array_type_p (TREE_TYPE (x)))
3143 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3144 replacing with appropriate values if they are invalid. */
3146 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3149 unsigned int max_width;
3150 unsigned HOST_WIDE_INT w;
3151 const char *name = orig_name ? orig_name: _("<anonymous>");
3154 STRIP_NOPS (*width);
3156 /* Detect and ignore out of range field width and process valid
3158 if (TREE_CODE (*width) != INTEGER_CST)
3160 error ("bit-field `%s' width not an integer constant", name);
3161 *width = integer_one_node;
3165 constant_expression_warning (*width);
3166 if (tree_int_cst_sgn (*width) < 0)
3168 error ("negative width in bit-field `%s'", name);
3169 *width = integer_one_node;
3171 else if (integer_zerop (*width) && orig_name)
3173 error ("zero width for bit-field `%s'", name);
3174 *width = integer_one_node;
3178 /* Detect invalid bit-field type. */
3179 if (TREE_CODE (*type) != INTEGER_TYPE
3180 && TREE_CODE (*type) != BOOLEAN_TYPE
3181 && TREE_CODE (*type) != ENUMERAL_TYPE)
3183 error ("bit-field `%s' has invalid type", name);
3184 *type = unsigned_type_node;
3187 type_mv = TYPE_MAIN_VARIANT (*type);
3189 && type_mv != integer_type_node
3190 && type_mv != unsigned_type_node
3191 && type_mv != boolean_type_node)
3192 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3194 if (type_mv == boolean_type_node)
3195 max_width = CHAR_TYPE_SIZE;
3197 max_width = TYPE_PRECISION (*type);
3199 if (0 < compare_tree_int (*width, max_width))
3201 error ("width of `%s' exceeds its type", name);
3203 *width = build_int_2 (w, 0);
3206 w = tree_low_cst (*width, 1);
3208 if (TREE_CODE (*type) == ENUMERAL_TYPE
3209 && (w < min_precision (TYPE_MIN_VALUE (*type), TREE_UNSIGNED (*type))
3210 || w < min_precision (TYPE_MAX_VALUE (*type), TREE_UNSIGNED (*type))))
3211 warning ("`%s' is narrower than values of its type", name);
3214 /* Given declspecs and a declarator,
3215 determine the name and type of the object declared
3216 and construct a ..._DECL node for it.
3217 (In one case we can return a ..._TYPE node instead.
3218 For invalid input we sometimes return 0.)
3220 DECLSPECS is a chain of tree_list nodes whose value fields
3221 are the storage classes and type specifiers.
3223 DECL_CONTEXT says which syntactic context this declaration is in:
3224 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3225 FUNCDEF for a function definition. Like NORMAL but a few different
3226 error messages in each case. Return value may be zero meaning
3227 this definition is too screwy to try to parse.
3228 PARM for a parameter declaration (either within a function prototype
3229 or before a function body). Make a PARM_DECL, or return void_type_node.
3230 TYPENAME if for a typename (in a cast or sizeof).
3231 Don't make a DECL node; just return the ..._TYPE node.
3232 FIELD for a struct or union field; make a FIELD_DECL.
3233 INITIALIZED is 1 if the decl has an initializer.
3234 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3235 representing the width of the bit-field.
3237 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3238 It may also be so in the PARM case, for a prototype where the
3239 argument type is specified but not the name.
3241 This function is where the complicated C meanings of `static'
3242 and `extern' are interpreted. */
3245 grokdeclarator (tree declarator, tree declspecs,
3246 enum decl_context decl_context, int initialized, tree *width)
3250 tree type = NULL_TREE;
3255 int type_quals = TYPE_UNQUALIFIED;
3257 int explicit_int = 0;
3258 int explicit_char = 0;
3259 int defaulted_int = 0;
3260 tree typedef_decl = 0;
3261 const char *name, *orig_name;
3262 tree typedef_type = 0;
3263 int funcdef_flag = 0;
3264 enum tree_code innermost_code = ERROR_MARK;
3265 int size_varies = 0;
3266 tree decl_attr = NULL_TREE;
3267 tree array_ptr_quals = NULL_TREE;
3268 int array_parm_static = 0;
3269 tree returned_attrs = NULL_TREE;
3270 bool bitfield = width != NULL;
3272 tree arg_info = NULL_TREE;
3274 if (decl_context == FUNCDEF)
3275 funcdef_flag = 1, decl_context = NORMAL;
3277 /* Look inside a declarator for the name being declared
3278 and get it as a string, for an error message. */
3280 tree decl = declarator;
3284 switch (TREE_CODE (decl))
3289 innermost_code = TREE_CODE (decl);
3290 decl = TREE_OPERAND (decl, 0);
3294 decl = TREE_VALUE (decl);
3297 case IDENTIFIER_NODE:
3298 name = IDENTIFIER_POINTER (decl);
3310 /* A function definition's declarator must have the form of
3311 a function declarator. */
3313 if (funcdef_flag && innermost_code != CALL_EXPR)
3316 /* If this looks like a function definition, make it one,
3317 even if it occurs where parms are expected.
3318 Then store_parm_decls will reject it and not use it as a parm. */
3319 if (decl_context == NORMAL && !funcdef_flag
3320 && current_scope->parm_flag)
3321 decl_context = PARM;
3323 /* Look through the decl specs and record which ones appear.
3324 Some typespecs are defined as built-in typenames.
3325 Others, the ones that are modifiers of other types,
3326 are represented by bits in SPECBITS: set the bits for
3327 the modifiers that appear. Storage class keywords are also in SPECBITS.
3329 If there is a typedef name or a type, store the type in TYPE.
3330 This includes builtin typedefs such as `int'.
3332 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3333 and did not come from a user typedef.
3335 Set LONGLONG if `long' is mentioned twice. */
3337 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3339 tree id = TREE_VALUE (spec);
3341 /* If the entire declaration is itself tagged as deprecated then
3342 suppress reports of deprecated items. */
3343 if (id && TREE_DEPRECATED (id))
3345 if (deprecated_state != DEPRECATED_SUPPRESS)
3346 warn_deprecated_use (id);
3349 if (id == ridpointers[(int) RID_INT])
3351 if (id == ridpointers[(int) RID_CHAR])
3354 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3356 enum rid i = C_RID_CODE (id);
3357 if ((int) i <= (int) RID_LAST_MODIFIER)
3359 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3362 error ("`long long long' is too long for GCC");
3365 if (pedantic && !flag_isoc99 && ! in_system_header
3367 pedwarn ("ISO C90 does not support `long long'");
3371 else if (specbits & (1 << (int) i))
3373 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3376 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3379 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3382 /* Diagnose "__thread extern". Recall that this list
3383 is in the reverse order seen in the text. */
3385 && (specbits & (1 << (int) RID_EXTERN
3386 | 1 << (int) RID_STATIC)))
3388 if (specbits & 1 << (int) RID_EXTERN)
3389 error ("`__thread' before `extern'");
3391 error ("`__thread' before `static'");
3394 specbits |= 1 << (int) i;
3399 error ("two or more data types in declaration of `%s'", name);
3400 /* Actual typedefs come to us as TYPE_DECL nodes. */
3401 else if (TREE_CODE (id) == TYPE_DECL)
3403 if (TREE_TYPE (id) == error_mark_node)
3404 ; /* Allow the type to default to int to avoid cascading errors. */
3407 type = TREE_TYPE (id);
3408 decl_attr = DECL_ATTRIBUTES (id);
3412 /* Built-in types come as identifiers. */
3413 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3415 tree t = lookup_name (id);
3416 if (TREE_TYPE (t) == error_mark_node)
3418 else if (!t || TREE_CODE (t) != TYPE_DECL)
3419 error ("`%s' fails to be a typedef or built in type",
3420 IDENTIFIER_POINTER (id));
3423 type = TREE_TYPE (t);
3427 else if (TREE_CODE (id) != ERROR_MARK)
3434 typedef_type = type;
3436 size_varies = C_TYPE_VARIABLE_SIZE (type);
3438 /* No type at all: default to `int', and set DEFAULTED_INT
3439 because it was not a user-defined typedef. */
3443 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3444 | (1 << (int) RID_SIGNED)
3445 | (1 << (int) RID_UNSIGNED)
3446 | (1 << (int) RID_COMPLEX))))
3447 /* Don't warn about typedef foo = bar. */
3448 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3449 && ! in_system_header)
3451 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3452 and this is a function, or if -Wimplicit; prefer the former
3453 warning since it is more explicit. */
3454 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3456 warn_about_return_type = 1;
3457 else if (warn_implicit_int || flag_isoc99)
3458 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3463 type = integer_type_node;
3466 /* Now process the modifiers that were specified
3467 and check for invalid combinations. */
3469 /* Long double is a special combination. */
3471 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3472 && TYPE_MAIN_VARIANT (type) == double_type_node)
3474 specbits &= ~(1 << (int) RID_LONG);
3475 type = long_double_type_node;
3478 /* Check all other uses of type modifiers. */
3480 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3481 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3485 if ((specbits & 1 << (int) RID_LONG)
3486 && (specbits & 1 << (int) RID_SHORT))
3487 error ("both long and short specified for `%s'", name);
3488 else if (((specbits & 1 << (int) RID_LONG)
3489 || (specbits & 1 << (int) RID_SHORT))
3491 error ("long or short specified with char for `%s'", name);
3492 else if (((specbits & 1 << (int) RID_LONG)
3493 || (specbits & 1 << (int) RID_SHORT))
3494 && TREE_CODE (type) == REAL_TYPE)
3496 static int already = 0;
3498 error ("long or short specified with floating type for `%s'", name);
3499 if (! already && ! pedantic)
3501 error ("the only valid combination is `long double'");
3505 else if ((specbits & 1 << (int) RID_SIGNED)
3506 && (specbits & 1 << (int) RID_UNSIGNED))
3507 error ("both signed and unsigned specified for `%s'", name);
3508 else if (TREE_CODE (type) != INTEGER_TYPE)
3509 error ("long, short, signed or unsigned invalid for `%s'", name);
3513 if (!explicit_int && !defaulted_int && !explicit_char)
3515 error ("long, short, signed or unsigned used invalidly for `%s'",
3521 /* Discard the type modifiers if they are invalid. */
3524 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3525 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3530 if ((specbits & (1 << (int) RID_COMPLEX))
3531 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3533 error ("complex invalid for `%s'", name);
3534 specbits &= ~(1 << (int) RID_COMPLEX);
3537 /* Decide whether an integer type is signed or not.
3538 Optionally treat bit-fields as signed by default. */
3539 if (specbits & 1 << (int) RID_UNSIGNED
3540 || (bitfield && ! flag_signed_bitfields
3541 && (explicit_int || defaulted_int || explicit_char
3542 /* A typedef for plain `int' without `signed'
3543 can be controlled just like plain `int'. */
3544 || ! (typedef_decl != 0
3545 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3546 && TREE_CODE (type) != ENUMERAL_TYPE
3547 && !(specbits & 1 << (int) RID_SIGNED)))
3550 type = long_long_unsigned_type_node;
3551 else if (specbits & 1 << (int) RID_LONG)
3552 type = long_unsigned_type_node;
3553 else if (specbits & 1 << (int) RID_SHORT)
3554 type = short_unsigned_type_node;
3555 else if (type == char_type_node)
3556 type = unsigned_char_type_node;
3557 else if (typedef_decl)
3558 type = c_common_unsigned_type (type);
3560 type = unsigned_type_node;
3562 else if ((specbits & 1 << (int) RID_SIGNED)
3563 && type == char_type_node)
3564 type = signed_char_type_node;
3566 type = long_long_integer_type_node;
3567 else if (specbits & 1 << (int) RID_LONG)
3568 type = long_integer_type_node;
3569 else if (specbits & 1 << (int) RID_SHORT)
3570 type = short_integer_type_node;
3572 if (specbits & 1 << (int) RID_COMPLEX)
3574 if (pedantic && !flag_isoc99)
3575 pedwarn ("ISO C90 does not support complex types");
3576 /* If we just have "complex", it is equivalent to
3577 "complex double", but if any modifiers at all are specified it is
3578 the complex form of TYPE. E.g, "complex short" is
3579 "complex short int". */
3581 if (defaulted_int && ! longlong
3582 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3583 | (1 << (int) RID_SIGNED)
3584 | (1 << (int) RID_UNSIGNED))))
3587 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3588 type = complex_double_type_node;
3590 else if (type == integer_type_node)
3593 pedwarn ("ISO C does not support complex integer types");
3594 type = complex_integer_type_node;
3596 else if (type == float_type_node)
3597 type = complex_float_type_node;
3598 else if (type == double_type_node)
3599 type = complex_double_type_node;
3600 else if (type == long_double_type_node)
3601 type = complex_long_double_type_node;
3605 pedwarn ("ISO C does not support complex integer types");
3606 type = build_complex_type (type);
3610 /* Check the type and width of a bit-field. */
3612 check_bitfield_type_and_width (&type, width, orig_name);
3614 /* Figure out the type qualifiers for the declaration. There are
3615 two ways a declaration can become qualified. One is something
3616 like `const int i' where the `const' is explicit. Another is
3617 something like `typedef const int CI; CI i' where the type of the
3618 declaration contains the `const'. A third possibility is that
3619 there is a type qualifier on the element type of a typedefed
3620 array type, in which case we should extract that qualifier so
3621 that c_apply_type_quals_to_decls receives the full list of
3622 qualifiers to work with (C90 is not entirely clear about whether
3623 duplicate qualifiers should be diagnosed in this case, but it
3624 seems most appropriate to do so). */
3625 element_type = strip_array_types (type);
3626 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3628 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3630 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3631 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3632 if (constp > 1 && ! flag_isoc99)
3633 pedwarn ("duplicate `const'");
3634 if (restrictp > 1 && ! flag_isoc99)
3635 pedwarn ("duplicate `restrict'");
3636 if (volatilep > 1 && ! flag_isoc99)
3637 pedwarn ("duplicate `volatile'");
3638 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3639 type = TYPE_MAIN_VARIANT (type);
3640 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3641 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3642 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3644 /* Warn if two storage classes are given. Default to `auto'. */
3649 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3650 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3651 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3652 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3653 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3655 /* "static __thread" and "extern __thread" are allowed. */
3656 if ((specbits & (1 << (int) RID_THREAD
3657 | 1 << (int) RID_STATIC
3658 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3661 /* Warn about storage classes that are invalid for certain
3662 kinds of declarations (parameters, typenames, etc.). */
3665 error ("multiple storage classes in declaration of `%s'", name);
3666 else if (funcdef_flag
3668 & ((1 << (int) RID_REGISTER)
3669 | (1 << (int) RID_AUTO)
3670 | (1 << (int) RID_TYPEDEF)
3671 | (1 << (int) RID_THREAD))))
3673 if (specbits & 1 << (int) RID_AUTO
3674 && (pedantic || current_scope == global_scope))
3675 pedwarn ("function definition declared `auto'");
3676 if (specbits & 1 << (int) RID_REGISTER)
3677 error ("function definition declared `register'");
3678 if (specbits & 1 << (int) RID_TYPEDEF)
3679 error ("function definition declared `typedef'");
3680 if (specbits & 1 << (int) RID_THREAD)
3681 error ("function definition declared `__thread'");
3682 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3683 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3685 else if (decl_context != NORMAL && nclasses > 0)
3687 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3691 switch (decl_context)
3694 error ("storage class specified for structure field `%s'",
3698 error ("storage class specified for parameter `%s'", name);
3701 error ("storage class specified for typename");
3704 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3705 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3706 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3709 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3711 /* `extern' with initialization is invalid if not at file scope. */
3712 if (current_scope == global_scope)
3713 warning ("`%s' initialized and declared `extern'", name);
3715 error ("`%s' has both `extern' and initializer", name);
3717 else if (current_scope == global_scope)
3719 if (specbits & 1 << (int) RID_AUTO)
3720 error ("file-scope declaration of `%s' specifies `auto'", name);
3724 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3725 error ("nested function `%s' declared `extern'", name);
3726 else if ((specbits & (1 << (int) RID_THREAD
3727 | 1 << (int) RID_EXTERN
3728 | 1 << (int) RID_STATIC))
3729 == (1 << (int) RID_THREAD))
3731 error ("function-scope `%s' implicitly auto and declared `__thread'",
3733 specbits &= ~(1 << (int) RID_THREAD);
3738 /* Now figure out the structure of the declarator proper.
3739 Descend through it, creating more complex types, until we reach
3740 the declared identifier (or NULL_TREE, in an absolute declarator). */
3742 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3744 if (type == error_mark_node)
3746 declarator = TREE_OPERAND (declarator, 0);
3750 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3751 an INDIRECT_REF (for *...),
3752 a CALL_EXPR (for ...(...)),
3753 a TREE_LIST (for nested attributes),
3754 an identifier (for the name being declared)
3755 or a null pointer (for the place in an absolute declarator
3756 where the name was omitted).
3757 For the last two cases, we have just exited the loop.
3759 At this point, TYPE is the type of elements of an array,
3760 or for a function to return, or for a pointer to point to.
3761 After this sequence of ifs, TYPE is the type of the
3762 array or function or pointer, and DECLARATOR has had its
3763 outermost layer removed. */
3765 if (array_ptr_quals != NULL_TREE || array_parm_static)
3767 /* Only the innermost declarator (making a parameter be of
3768 array type which is converted to pointer type)
3769 may have static or type qualifiers. */
3770 error ("static or type qualifiers in non-parameter array declarator");
3771 array_ptr_quals = NULL_TREE;
3772 array_parm_static = 0;
3775 if (TREE_CODE (declarator) == TREE_LIST)
3777 /* We encode a declarator with embedded attributes using
3779 tree attrs = TREE_PURPOSE (declarator);
3782 declarator = TREE_VALUE (declarator);
3783 inner_decl = declarator;
3784 while (inner_decl != NULL_TREE
3785 && TREE_CODE (inner_decl) == TREE_LIST)
3786 inner_decl = TREE_VALUE (inner_decl);
3787 if (inner_decl == NULL_TREE
3788 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3789 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3790 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3791 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3792 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3793 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3794 returned_attrs = decl_attributes (&type,
3795 chainon (returned_attrs, attrs),
3798 else if (TREE_CODE (declarator) == ARRAY_REF)
3800 tree itype = NULL_TREE;
3801 tree size = TREE_OPERAND (declarator, 1);
3802 /* The index is a signed object `sizetype' bits wide. */
3803 tree index_type = c_common_signed_type (sizetype);
3805 array_ptr_quals = TREE_TYPE (declarator);
3806 array_parm_static = TREE_STATIC (declarator);
3808 declarator = TREE_OPERAND (declarator, 0);
3810 /* Check for some types that there cannot be arrays of. */
3812 if (VOID_TYPE_P (type))
3814 error ("declaration of `%s' as array of voids", name);
3815 type = error_mark_node;
3818 if (TREE_CODE (type) == FUNCTION_TYPE)
3820 error ("declaration of `%s' as array of functions", name);
3821 type = error_mark_node;
3824 if (pedantic && flexible_array_type_p (type))
3825 pedwarn ("invalid use of structure with flexible array member");
3827 if (size == error_mark_node)
3828 type = error_mark_node;
3830 if (type == error_mark_node)
3833 /* If size was specified, set ITYPE to a range-type for that size.
3834 Otherwise, ITYPE remains null. finish_decl may figure it out
3835 from an initial value. */
3839 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3840 STRIP_TYPE_NOPS (size);
3842 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3844 error ("size of array `%s' has non-integer type", name);
3845 size = integer_one_node;
3848 if (pedantic && integer_zerop (size))
3849 pedwarn ("ISO C forbids zero-size array `%s'", name);
3851 if (TREE_CODE (size) == INTEGER_CST)
3853 constant_expression_warning (size);
3854 if (tree_int_cst_sgn (size) < 0)
3856 error ("size of array `%s' is negative", name);
3857 size = integer_one_node;
3862 /* Make sure the array size remains visibly nonconstant
3863 even if it is (eg) a const variable with known value. */
3866 if (!flag_isoc99 && pedantic)
3868 if (TREE_CONSTANT (size))
3869 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3872 pedwarn ("ISO C90 forbids variable-size array `%s'",
3877 if (integer_zerop (size))
3879 /* A zero-length array cannot be represented with an
3880 unsigned index type, which is what we'll get with
3881 build_index_type. Create an open-ended range instead. */
3882 itype = build_range_type (sizetype, size, NULL_TREE);
3886 /* Compute the maximum valid index, that is, size - 1.
3887 Do the calculation in index_type, so that if it is
3888 a variable the computations will be done in the
3890 itype = fold (build (MINUS_EXPR, index_type,
3891 convert (index_type, size),
3892 convert (index_type, size_one_node)));
3894 /* If that overflowed, the array is too big.
3895 ??? While a size of INT_MAX+1 technically shouldn't
3896 cause an overflow (because we subtract 1), the overflow
3897 is recorded during the conversion to index_type, before
3898 the subtraction. Handling this case seems like an
3899 unnecessary complication. */
3900 if (TREE_OVERFLOW (itype))
3902 error ("size of array `%s' is too large", name);
3903 type = error_mark_node;
3909 /* We must be able to distinguish the
3910 SAVE_EXPR_CONTEXT for the variably-sized type
3911 so that we can set it correctly in
3912 set_save_expr_context. The convention is
3913 that all SAVE_EXPRs that need to be reset
3914 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3915 tree cfd = current_function_decl;
3916 if (decl_context == PARM)
3917 current_function_decl = NULL_TREE;
3918 itype = variable_size (itype);
3919 if (decl_context == PARM)
3920 current_function_decl = cfd;
3922 itype = build_index_type (itype);
3925 else if (decl_context == FIELD)
3927 if (pedantic && !flag_isoc99 && !in_system_header)
3928 pedwarn ("ISO C90 does not support flexible array members");
3930 /* ISO C99 Flexible array members are effectively identical
3931 to GCC's zero-length array extension. */
3932 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3935 /* If pedantic, complain about arrays of incomplete types. */
3937 if (pedantic && !COMPLETE_TYPE_P (type))
3938 pedwarn ("array type has incomplete element type");
3940 /* Build the array type itself, then merge any constancy or
3941 volatility into the target type. We must do it in this order
3942 to ensure that the TYPE_MAIN_VARIANT field of the array type
3943 is set correctly. */
3945 type = build_array_type (type, itype);
3947 type = c_build_qualified_type (type, type_quals);
3950 C_TYPE_VARIABLE_SIZE (type) = 1;
3952 /* The GCC extension for zero-length arrays differs from
3953 ISO flexible array members in that sizeof yields zero. */
3954 if (size && integer_zerop (size))
3957 TYPE_SIZE (type) = bitsize_zero_node;
3958 TYPE_SIZE_UNIT (type) = size_zero_node;
3960 if (decl_context != PARM
3961 && (array_ptr_quals != NULL_TREE || array_parm_static))
3963 error ("static or type qualifiers in non-parameter array declarator");
3964 array_ptr_quals = NULL_TREE;
3965 array_parm_static = 0;
3968 else if (TREE_CODE (declarator) == CALL_EXPR)
3970 /* Declaring a function type. Say it's a definition only
3971 for the CALL_EXPR closest to the identifier. */
3972 bool really_funcdef = (funcdef_flag
3973 && (TREE_CODE (TREE_OPERAND (declarator, 0))
3974 == IDENTIFIER_NODE));
3977 /* Make sure we have a valid type for the function to return. */
3978 if (type == error_mark_node)
3983 /* Warn about some types functions can't return. */
3985 if (TREE_CODE (type) == FUNCTION_TYPE)
3987 error ("`%s' declared as function returning a function", name);
3988 type = integer_type_node;
3990 if (TREE_CODE (type) == ARRAY_TYPE)
3992 error ("`%s' declared as function returning an array", name);
3993 type = integer_type_node;
3996 /* Construct the function type and go to the next
3997 inner layer of declarator. */
3998 arg_info = TREE_OPERAND (declarator, 1);
3999 arg_types = grokparms (arg_info, really_funcdef);
4001 /* Type qualifiers before the return type of the function
4002 qualify the return type, not the function type. */
4005 /* Type qualifiers on a function return type are normally
4006 permitted by the standard but have no effect, so give a
4007 warning at -Wextra. Qualifiers on a void return type have
4008 meaning as a GNU extension, and are banned on function
4009 definitions in ISO C. FIXME: strictly we shouldn't
4010 pedwarn for qualified void return types except on function
4011 definitions, but not doing so could lead to the undesirable
4012 state of a "volatile void" function return type not being
4013 warned about, and a use of the function being compiled
4014 with GNU semantics, with no diagnostics under -pedantic. */
4015 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4016 pedwarn ("ISO C forbids qualified void function return type");
4017 else if (extra_warnings
4018 && !(VOID_TYPE_P (type)
4019 && type_quals == TYPE_QUAL_VOLATILE))
4020 warning ("type qualifiers ignored on function return type");
4022 type = c_build_qualified_type (type, type_quals);
4024 type_quals = TYPE_UNQUALIFIED;
4026 type = build_function_type (type, arg_types);
4027 declarator = TREE_OPERAND (declarator, 0);
4029 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4030 the formal parameter list of this FUNCTION_TYPE to point to
4031 the FUNCTION_TYPE node itself. */
4036 for (link = ARG_INFO_TAGS (arg_info);
4038 link = TREE_CHAIN (link))
4039 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4042 else if (TREE_CODE (declarator) == INDIRECT_REF)
4044 /* Merge any constancy or volatility into the target type
4047 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4049 pedwarn ("ISO C forbids qualified function types");
4051 type = c_build_qualified_type (type, type_quals);
4052 type_quals = TYPE_UNQUALIFIED;
4055 type = build_pointer_type (type);
4057 /* Process a list of type modifier keywords
4058 (such as const or volatile) that were given inside the `*'. */
4060 if (TREE_TYPE (declarator))
4068 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4069 typemodlist = TREE_CHAIN (typemodlist))
4071 tree qualifier = TREE_VALUE (typemodlist);
4073 if (C_IS_RESERVED_WORD (qualifier))
4075 if (C_RID_CODE (qualifier) == RID_CONST)
4077 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4079 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4089 error ("invalid type modifier within pointer declarator");
4090 if (constp > 1 && ! flag_isoc99)
4091 pedwarn ("duplicate `const'");
4092 if (volatilep > 1 && ! flag_isoc99)
4093 pedwarn ("duplicate `volatile'");
4094 if (restrictp > 1 && ! flag_isoc99)
4095 pedwarn ("duplicate `restrict'");
4097 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4098 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4099 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4102 declarator = TREE_OPERAND (declarator, 0);
4109 /* Now TYPE has the actual type. */
4111 /* Did array size calculations overflow? */
4113 if (TREE_CODE (type) == ARRAY_TYPE
4114 && COMPLETE_TYPE_P (type)
4115 && TREE_OVERFLOW (TYPE_SIZE (type)))
4117 error ("size of array `%s' is too large", name);
4118 /* If we proceed with the array type as it is, we'll eventually
4119 crash in tree_low_cst(). */
4120 type = error_mark_node;
4123 /* If this is declaring a typedef name, return a TYPE_DECL. */
4125 if (specbits & (1 << (int) RID_TYPEDEF))
4128 /* Note that the grammar rejects storage classes
4129 in typenames, fields or parameters */
4130 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4132 pedwarn ("ISO C forbids qualified function types");
4134 type = c_build_qualified_type (type, type_quals);
4135 decl = build_decl (TYPE_DECL, declarator, type);
4136 if ((specbits & (1 << (int) RID_SIGNED))
4137 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4138 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4139 decl_attributes (&decl, returned_attrs, 0);
4143 /* Detect the case of an array type of unspecified size
4144 which came, as such, direct from a typedef name.
4145 We must copy the type, so that each identifier gets
4146 a distinct type, so that each identifier's size can be
4147 controlled separately by its own initializer. */
4149 if (type != 0 && typedef_type != 0
4150 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4151 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4153 type = build_array_type (TREE_TYPE (type), 0);
4155 C_TYPE_VARIABLE_SIZE (type) = 1;
4158 /* If this is a type name (such as, in a cast or sizeof),
4159 compute the type and return it now. */
4161 if (decl_context == TYPENAME)
4163 /* Note that the grammar rejects storage classes
4164 in typenames, fields or parameters */
4165 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4167 pedwarn ("ISO C forbids const or volatile function types");
4169 type = c_build_qualified_type (type, type_quals);
4170 decl_attributes (&type, returned_attrs, 0);
4174 /* Aside from typedefs and type names (handle above),
4175 `void' at top level (not within pointer)
4176 is allowed only in public variables.
4177 We don't complain about parms either, but that is because
4178 a better error message can be made later. */
4180 if (VOID_TYPE_P (type) && decl_context != PARM
4181 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4182 && ((specbits & (1 << (int) RID_EXTERN))
4183 || (current_scope == global_scope
4185 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4187 error ("variable or field `%s' declared void", name);
4188 type = integer_type_node;
4191 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4192 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4197 if (decl_context == PARM)
4199 tree type_as_written;
4202 /* A parameter declared as an array of T is really a pointer to T.
4203 One declared as a function is really a pointer to a function. */
4205 if (TREE_CODE (type) == ARRAY_TYPE)
4207 /* Transfer const-ness of array into that of type pointed to. */
4208 type = TREE_TYPE (type);
4210 type = c_build_qualified_type (type, type_quals);
4211 type = build_pointer_type (type);
4212 type_quals = TYPE_UNQUALIFIED;
4213 if (array_ptr_quals)
4215 tree new_ptr_quals, new_ptr_attrs;
4217 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4218 /* We don't yet implement attributes in this context. */
4219 if (new_ptr_attrs != NULL_TREE)
4220 warning ("attributes in parameter array declarator ignored");
4225 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4227 tree qualifier = TREE_VALUE (new_ptr_quals);
4229 if (C_IS_RESERVED_WORD (qualifier))
4231 if (C_RID_CODE (qualifier) == RID_CONST)
4233 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4235 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4245 error ("invalid type modifier within array declarator");
4247 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4248 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4249 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4253 else if (TREE_CODE (type) == FUNCTION_TYPE)
4255 if (pedantic && type_quals)
4256 pedwarn ("ISO C forbids qualified function types");
4258 type = c_build_qualified_type (type, type_quals);
4259 type = build_pointer_type (type);
4260 type_quals = TYPE_UNQUALIFIED;
4262 else if (type_quals)
4263 type = c_build_qualified_type (type, type_quals);
4265 type_as_written = type;
4267 decl = build_decl (PARM_DECL, declarator, type);
4269 C_DECL_VARIABLE_SIZE (decl) = 1;
4271 /* Compute the type actually passed in the parmlist,
4272 for the case where there is no prototype.
4273 (For example, shorts and chars are passed as ints.)
4274 When there is a prototype, this is overridden later. */
4276 if (type == error_mark_node)
4277 promoted_type = type;
4279 promoted_type = c_type_promotes_to (type);
4281 DECL_ARG_TYPE (decl) = promoted_type;
4282 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4284 else if (decl_context == FIELD)
4286 /* Structure field. It may not be a function. */
4288 if (TREE_CODE (type) == FUNCTION_TYPE)
4290 error ("field `%s' declared as a function", name);
4291 type = build_pointer_type (type);
4293 else if (TREE_CODE (type) != ERROR_MARK
4294 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4296 error ("field `%s' has incomplete type", name);
4297 type = error_mark_node;
4299 /* Move type qualifiers down to element of an array. */
4300 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4301 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4303 TYPE_DOMAIN (type));
4304 decl = build_decl (FIELD_DECL, declarator, type);
4305 DECL_NONADDRESSABLE_P (decl) = bitfield;
4308 C_DECL_VARIABLE_SIZE (decl) = 1;
4310 else if (TREE_CODE (type) == FUNCTION_TYPE)
4312 /* Every function declaration is "external"
4313 except for those which are inside a function body
4314 in which `auto' is used.
4315 That is a case not specified by ANSI C,
4316 and we use it for forward declarations for nested functions. */
4317 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4318 || current_scope == global_scope);
4320 if (specbits & (1 << (int) RID_AUTO)
4321 && (pedantic || current_scope == global_scope))
4322 pedwarn ("invalid storage class for function `%s'", name);
4323 if (specbits & (1 << (int) RID_REGISTER))
4324 error ("invalid storage class for function `%s'", name);
4325 if (specbits & (1 << (int) RID_THREAD))
4326 error ("invalid storage class for function `%s'", name);
4327 /* Function declaration not at file scope.
4328 Storage classes other than `extern' are not allowed
4329 and `extern' makes no difference. */
4330 if (current_scope != global_scope
4331 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4333 pedwarn ("invalid storage class for function `%s'", name);
4335 decl = build_decl (FUNCTION_DECL, declarator, type);
4336 decl = build_decl_attribute_variant (decl, decl_attr);
4338 DECL_LANG_SPECIFIC (decl)
4339 = ggc_alloc_cleared (sizeof (struct lang_decl));
4341 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4342 pedwarn ("ISO C forbids qualified function types");
4344 /* GNU C interprets a `volatile void' return type to indicate
4345 that the function does not return. */
4346 if ((type_quals & TYPE_QUAL_VOLATILE)
4347 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4348 warning ("`noreturn' function returns non-void value");
4351 DECL_EXTERNAL (decl) = 1;
4352 /* Record absence of global scope for `static' or `auto'. */
4354 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4356 /* For a function definition, record the argument information
4357 block in DECL_ARGUMENTS where store_parm_decls will look
4360 DECL_ARGUMENTS (decl) = arg_info;
4363 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4365 /* Record presence of `inline', if it is reasonable. */
4366 if (MAIN_NAME_P (declarator))
4369 warning ("cannot inline function `main'");
4373 /* Record that the function is declared `inline'. */
4374 DECL_DECLARED_INLINE_P (decl) = 1;
4376 /* Do not mark bare declarations as DECL_INLINE. Doing so
4377 in the presence of multiple declarations can result in
4378 the abstract origin pointing between the declarations,
4379 which will confuse dwarf2out. */
4382 DECL_INLINE (decl) = 1;
4383 if (specbits & (1 << (int) RID_EXTERN))
4384 current_extern_inline = 1;
4387 /* If -finline-functions, assume it can be inlined. This does
4388 two things: let the function be deferred until it is actually
4389 needed, and let dwarf2 know that the function is inlinable. */
4390 else if (flag_inline_trees == 2 && initialized)
4391 DECL_INLINE (decl) = 1;
4395 /* It's a variable. */
4396 /* An uninitialized decl with `extern' is a reference. */
4397 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4399 /* Move type qualifiers down to element of an array. */
4400 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4402 int saved_align = TYPE_ALIGN(type);
4403 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4405 TYPE_DOMAIN (type));
4406 TYPE_ALIGN (type) = saved_align;
4408 else if (type_quals)
4409 type = c_build_qualified_type (type, type_quals);
4411 /* It is invalid to create an `extern' declaration for a
4412 variable if there is a global declaration that is
4414 if (extern_ref && current_scope != global_scope)
4418 global_decl = identifier_global_value (declarator);
4420 && TREE_CODE (global_decl) == VAR_DECL
4421 && !TREE_PUBLIC (global_decl))
4422 error ("variable previously declared `static' redeclared "
4426 decl = build_decl (VAR_DECL, declarator, type);
4428 C_DECL_VARIABLE_SIZE (decl) = 1;
4431 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4433 DECL_EXTERNAL (decl) = extern_ref;
4435 /* At file scope, the presence of a `static' or `register' storage
4436 class specifier, or the absence of all storage class specifiers
4437 makes this declaration a definition (perhaps tentative). Also,
4438 the absence of both `static' and `register' makes it public. */
4439 if (current_scope == global_scope)
4441 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4442 | (1 << (int) RID_REGISTER)));
4443 TREE_STATIC (decl) = !extern_ref;
4445 /* Not at file scope, only `static' makes a static definition. */
4448 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4449 TREE_PUBLIC (decl) = extern_ref;
4452 if (specbits & 1 << (int) RID_THREAD)
4454 if (targetm.have_tls)
4455 DECL_THREAD_LOCAL (decl) = 1;
4457 /* A mere warning is sure to result in improper semantics
4458 at runtime. Don't bother to allow this to compile. */
4459 error ("thread-local storage not supported for this target");
4463 /* Record `register' declaration for warnings on &
4464 and in case doing stupid register allocation. */
4466 if (specbits & (1 << (int) RID_REGISTER))
4467 DECL_REGISTER (decl) = 1;
4469 /* Record constancy and volatility. */
4470 c_apply_type_quals_to_decl (type_quals, decl);
4472 /* If a type has volatile components, it should be stored in memory.
4473 Otherwise, the fact that those components are volatile
4474 will be ignored, and would even crash the compiler. */
4475 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4476 c_mark_addressable (decl);
4478 #ifdef ENABLE_CHECKING
4479 /* This is the earliest point at which we might know the assembler
4480 name of a variable. Thus, if it's known before this, die horribly. */
4481 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4485 decl_attributes (&decl, returned_attrs, 0);
4491 /* Decode the parameter-list info for a function type or function definition.
4492 The argument is the value returned by `get_parm_info' (or made in parse.y
4493 if there is an identifier list instead of a parameter decl list).
4494 These two functions are separate because when a function returns
4495 or receives functions then each is called multiple times but the order
4496 of calls is different. The last call to `grokparms' is always the one
4497 that contains the formal parameter names of a function definition.
4499 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4501 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4502 a mere declaration. A nonempty identifier-list gets an error message
4503 when FUNCDEF_FLAG is zero. */
4506 grokparms (tree arg_info, int funcdef_flag)
4508 tree arg_types = ARG_INFO_TYPES (arg_info);
4510 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4511 && !in_system_header)
4512 warning ("function declaration isn't a prototype");
4514 if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4517 pedwarn ("parameter names (without types) in function declaration");
4519 ARG_INFO_PARMS (arg_info) = ARG_INFO_TYPES (arg_info);
4520 ARG_INFO_TYPES (arg_info) = 0;
4525 tree parm, type, typelt;
4526 unsigned int parmno;
4528 /* If the arg types are incomplete in a declaration, they must
4529 include undefined tags. These tags can never be defined in
4530 the scope of the declaration, so the types can never be
4531 completed, and no call can be compiled successfully. */
4533 for (parm = ARG_INFO_PARMS (arg_info), typelt = arg_types, parmno = 1;
4535 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4537 type = TREE_VALUE (typelt);
4538 if (type == error_mark_node)
4541 if (!COMPLETE_TYPE_P (type))
4545 if (DECL_NAME (parm))
4546 error ("%Jparameter %u ('%D') has incomplete type",
4547 parm, parmno, parm);
4549 error ("%Jparameter %u has incomplete type",
4552 TREE_VALUE (typelt) = error_mark_node;
4553 TREE_TYPE (parm) = error_mark_node;
4557 if (DECL_NAME (parm))
4558 warning ("%Jparameter %u ('%D') has incomplete type",
4559 parm, parmno, parm);
4561 warning ("%Jparameter %u has incomplete type",
4570 /* Return a tree_list node with info on a parameter list just parsed.
4571 This tree_list node should be examined using the ARG_INFO_* macros,
4573 ARG_INFO_PARMS: a list of parameter decls.
4574 ARG_INFO_TAGS: a list of structure, union and enum tags defined.
4575 ARG_INFO_TYPES: a list of argument types to go in the FUNCTION_TYPE.
4576 ARG_INFO_OTHERS: a list of non-parameter decls (notably enumeration
4577 constants) defined with the parameters.
4579 This tree_list node is later fed to 'grokparms' and 'store_parm_decls'.
4581 VOID_AT_END nonzero means append `void' to the end of the type-list.
4582 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4585 get_parm_info (int void_at_end)
4587 tree decl, type, list;
4589 tree *last_type = &types;
4590 tree tags = current_scope->tags;
4591 tree parms = current_scope->parms;
4592 tree others = current_scope->names;
4593 static bool explained_incomplete_types = false;
4594 bool gave_void_only_once_err = false;
4596 /* Just 'void' (and no ellipsis) is special. There are really no parms.
4597 But if the 'void' is qualified (by 'const' or 'volatile'), or has a
4598 storage class specifier ('register'), then the behavior is undefined;
4599 issue an error. Typedefs for 'void' are OK (see DR#157). */
4600 if (void_at_end && parms != 0
4601 && TREE_CHAIN (parms) == 0
4602 && VOID_TYPE_P (TREE_TYPE (parms))
4603 && !DECL_NAME (parms))
4605 if (TREE_THIS_VOLATILE (parms)
4606 || TREE_READONLY (parms)
4607 || DECL_REGISTER (parms))
4608 error ("'void' as only parameter may not be qualified");
4610 list = make_node (TREE_LIST);
4611 ARG_INFO_TYPES (list) = build_tree_list (0, void_type_node);
4615 /* Sanity check all of the parameter declarations. */
4616 for (decl = parms; decl; decl = TREE_CHAIN (decl))
4618 #ifdef ENABLE_CHECKING
4619 if (TREE_CODE (decl) != PARM_DECL)
4621 if (TREE_ASM_WRITTEN (decl))
4625 /* Since there is a prototype, args are passed in their
4626 declared types. The back end may override this. */
4627 type = TREE_TYPE (decl);
4628 DECL_ARG_TYPE (decl) = type;
4630 /* Check for (..., void, ...) and issue an error. */
4631 if (VOID_TYPE_P (type) && !DECL_NAME (decl) && !gave_void_only_once_err)
4633 error ("'void' must be the only parameter");
4634 gave_void_only_once_err = true;
4637 type = build_tree_list (0, type);
4639 last_type = &TREE_CHAIN (type);
4642 /* Check the list of non-parameter decls for any forward parm decls
4643 that never got real decls. */
4644 for (decl = others; decl; decl = TREE_CHAIN (decl))
4645 if (TREE_CODE (decl) == PARM_DECL)
4647 if (!TREE_ASM_WRITTEN (decl))
4650 error ("%Jparameter '%D' has just a forward declaration",
4654 /* Warn about any struct, union or enum tags defined within this
4655 list. The scope of such types is limited to this declaration,
4656 which is rarely if ever desirable (it's impossible to call such
4657 a function with type-correct arguments). */
4658 for (decl = tags; decl; decl = TREE_CHAIN (decl))
4660 enum tree_code code = TREE_CODE (TREE_VALUE (decl));
4661 const char *keyword;
4662 /* An anonymous union parm type is meaningful as a GNU extension.
4663 So don't warn for that. */
4664 if (code == UNION_TYPE && TREE_PURPOSE (decl) == 0 && !pedantic)
4667 /* The keyword should not be translated. */
4670 case RECORD_TYPE: keyword = "struct"; break;
4671 case UNION_TYPE: keyword = "union"; break;
4672 case ENUMERAL_TYPE: keyword = "enum"; break;
4676 if (TREE_PURPOSE (decl))
4677 /* The %s will be one of 'struct', 'union', or 'enum'. */
4678 warning ("'%s %E' declared inside parameter list",
4679 keyword, TREE_PURPOSE (decl));
4681 /* The %s will be one of 'struct', 'union', or 'enum'. */
4682 warning ("anonymous %s declared inside parameter list", keyword);
4684 if (! explained_incomplete_types)
4686 warning ("its scope is only this definition or declaration,"
4687 " which is probably not what you want");
4688 explained_incomplete_types = true;
4695 type = build_tree_list (0, void_type_node);
4699 list = make_node (TREE_LIST);
4700 ARG_INFO_PARMS (list) = parms;
4701 ARG_INFO_TAGS (list) = tags;
4702 ARG_INFO_TYPES (list) = types;
4703 ARG_INFO_OTHERS (list) = others;
4707 /* Get the struct, enum or union (CODE says which) with tag NAME.
4708 Define the tag as a forward-reference if it is not defined. */
4711 xref_tag (enum tree_code code, tree name)
4713 /* If a cross reference is requested, look up the type
4714 already defined for this tag and return it. */
4716 tree ref = lookup_tag (code, name, 0);
4717 /* If this is the right type of tag, return what we found.
4718 (This reference will be shadowed by shadow_tag later if appropriate.)
4719 If this is the wrong type of tag, do not return it. If it was the
4720 wrong type in the same scope, we will have had an error
4721 message already; if in a different scope and declaring
4722 a name, pending_xref_error will give an error message; but if in a
4723 different scope and not declaring a name, this tag should
4724 shadow the previous declaration of a different type of tag, and
4725 this would not work properly if we return the reference found.
4726 (For example, with "struct foo" in an outer scope, "union foo;"
4727 must shadow that tag with a new one of union type.) */
4728 if (ref && TREE_CODE (ref) == code)
4731 /* If no such tag is yet defined, create a forward-reference node
4732 and record it as the "definition".
4733 When a real declaration of this type is found,
4734 the forward-reference will be altered into a real type. */
4736 ref = make_node (code);
4737 if (code == ENUMERAL_TYPE)
4739 /* Give the type a default layout like unsigned int
4740 to avoid crashing if it does not get defined. */
4741 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4742 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4743 TYPE_USER_ALIGN (ref) = 0;
4744 TREE_UNSIGNED (ref) = 1;
4745 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4746 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4747 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4750 pushtag (name, ref);
4755 /* Make sure that the tag NAME is defined *in the current scope*
4756 at least as a forward reference.
4757 CODE says which kind of tag NAME ought to be. */
4760 start_struct (enum tree_code code, tree name)
4762 /* If there is already a tag defined at this scope
4763 (as a forward reference), just return it. */
4768 ref = lookup_tag (code, name, 1);
4769 if (ref && TREE_CODE (ref) == code)
4771 if (TYPE_FIELDS (ref))
4773 if (code == UNION_TYPE)
4774 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4776 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4781 /* Otherwise create a forward-reference just so the tag is in scope. */
4783 ref = make_node (code);
4784 pushtag (name, ref);
4787 C_TYPE_BEING_DEFINED (ref) = 1;
4788 TYPE_PACKED (ref) = flag_pack_struct;
4792 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4793 of a structure component, returning a FIELD_DECL node.
4794 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4796 This is done during the parsing of the struct declaration.
4797 The FIELD_DECL nodes are chained together and the lot of them
4798 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4801 grokfield (tree declarator, tree declspecs, tree width)
4805 if (declarator == NULL_TREE && width == NULL_TREE)
4807 /* This is an unnamed decl.
4809 If we have something of the form "union { list } ;" then this
4810 is the anonymous union extension. Similarly for struct.
4812 If this is something of the form "struct foo;", then
4813 If MS extensions are enabled, this is handled as an
4815 Otherwise this is a forward declaration of a structure tag.
4817 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4818 If MS extensions are enabled and foo names a structure, then
4819 again this is an anonymous struct.
4820 Otherwise this is an error.
4822 Oh what a horrid tangled web we weave. I wonder if MS consciously
4823 took this from Plan 9 or if it was an accident of implementation
4824 that took root before someone noticed the bug... */
4826 tree type = TREE_VALUE (declspecs);
4828 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4829 type = TREE_TYPE (type);
4830 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4832 if (flag_ms_extensions)
4835 goto warn_unnamed_field;
4836 else if (TYPE_NAME (type) == NULL)
4839 goto warn_unnamed_field;
4844 warning ("declaration does not declare anything");
4849 value = grokdeclarator (declarator, declspecs, FIELD, 0,
4850 width ? &width : NULL);
4852 finish_decl (value, NULL_TREE, NULL_TREE);
4853 DECL_INITIAL (value) = width;
4858 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4859 the list such that this does not present a problem later. */
4862 detect_field_duplicates (tree fieldlist)
4867 /* First, see if there are more than "a few" fields.
4868 This is trivially true if there are zero or one fields. */
4871 x = TREE_CHAIN (fieldlist);
4877 } while (timeout > 0 && x);
4879 /* If there were "few" fields, avoid the overhead of allocating
4880 a hash table. Instead just do the nested traversal thing. */
4883 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4886 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4887 if (DECL_NAME (y) == DECL_NAME (x))
4889 error ("%Jduplicate member '%D'", x, x);
4890 DECL_NAME (x) = NULL_TREE;
4896 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4899 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4900 if ((y = DECL_NAME (x)) != 0)
4902 slot = htab_find_slot (htab, y, INSERT);
4905 error ("%Jduplicate member '%D'", x, x);
4906 DECL_NAME (x) = NULL_TREE;
4915 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4916 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4917 ATTRIBUTES are attributes to be applied to the structure. */
4920 finish_struct (tree t, tree fieldlist, tree attributes)
4923 int toplevel = global_scope == current_scope;
4924 int saw_named_field;
4926 /* If this type was previously laid out as a forward reference,
4927 make sure we lay it out again. */
4931 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4933 /* Nameless union parm types are useful as GCC extension. */
4934 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4935 /* Otherwise, warn about any struct or union def. in parmlist. */
4936 if (in_parm_level_p ())
4939 pedwarn ("%s defined inside parms",
4940 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4942 warning ("%s defined inside parms",
4943 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4948 for (x = fieldlist; x; x = TREE_CHAIN (x))
4949 if (DECL_NAME (x) != 0)
4953 pedwarn ("%s has no %s",
4954 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4955 fieldlist ? _("named members") : _("members"));
4958 /* Install struct as DECL_CONTEXT of each field decl.
4959 Also process specified field sizes,m which is found in the DECL_INITIAL.
4960 Store 0 there, except for ": 0" fields (so we can find them
4961 and delete them, below). */
4963 saw_named_field = 0;
4964 for (x = fieldlist; x; x = TREE_CHAIN (x))
4966 DECL_CONTEXT (x) = t;
4967 DECL_PACKED (x) |= TYPE_PACKED (t);
4969 /* If any field is const, the structure type is pseudo-const. */
4970 if (TREE_READONLY (x))
4971 C_TYPE_FIELDS_READONLY (t) = 1;
4974 /* A field that is pseudo-const makes the structure likewise. */
4975 tree t1 = TREE_TYPE (x);
4976 while (TREE_CODE (t1) == ARRAY_TYPE)
4977 t1 = TREE_TYPE (t1);
4978 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4979 && C_TYPE_FIELDS_READONLY (t1))
4980 C_TYPE_FIELDS_READONLY (t) = 1;
4983 /* Any field that is volatile means variables of this type must be
4984 treated in some ways as volatile. */
4985 if (TREE_THIS_VOLATILE (x))
4986 C_TYPE_FIELDS_VOLATILE (t) = 1;
4988 /* Any field of nominal variable size implies structure is too. */
4989 if (C_DECL_VARIABLE_SIZE (x))
4990 C_TYPE_VARIABLE_SIZE (t) = 1;
4992 /* Detect invalid nested redefinition. */
4993 if (TREE_TYPE (x) == t)
4994 error ("nested redefinition of `%s'",
4995 IDENTIFIER_POINTER (TYPE_NAME (t)));
4997 if (DECL_INITIAL (x))
4999 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5000 DECL_SIZE (x) = bitsize_int (width);
5001 DECL_BIT_FIELD (x) = 1;
5002 SET_DECL_C_BIT_FIELD (x);
5005 DECL_INITIAL (x) = 0;
5007 /* Detect flexible array member in an invalid context. */
5008 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5009 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5010 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5011 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5013 if (TREE_CODE (t) == UNION_TYPE)
5014 error ("%Jflexible array member in union", x);
5015 else if (TREE_CHAIN (x) != NULL_TREE)
5016 error ("%Jflexible array member not at end of struct", x);
5017 else if (! saw_named_field)
5018 error ("%Jflexible array member in otherwise empty struct", x);
5021 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5022 && flexible_array_type_p (TREE_TYPE (x)))
5023 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5026 saw_named_field = 1;
5029 detect_field_duplicates (fieldlist);
5031 /* Now we have the nearly final fieldlist. Record it,
5032 then lay out the structure or union (including the fields). */
5034 TYPE_FIELDS (t) = fieldlist;
5038 /* Delete all zero-width bit-fields from the fieldlist. */
5040 tree *fieldlistp = &fieldlist;
5042 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5043 *fieldlistp = TREE_CHAIN (*fieldlistp);
5045 fieldlistp = &TREE_CHAIN (*fieldlistp);
5048 /* Now we have the truly final field list.
5049 Store it in this type and in the variants. */
5051 TYPE_FIELDS (t) = fieldlist;
5053 /* If there are lots of fields, sort so we can look through them fast.
5054 We arbitrarily consider 16 or more elts to be "a lot". */
5059 for (x = fieldlist; x; x = TREE_CHAIN (x))
5061 if (len > 15 || DECL_NAME (x) == NULL)
5069 struct lang_type *space;
5070 struct sorted_fields_type *space2;
5072 len += list_length (x);
5074 /* Use the same allocation policy here that make_node uses, to
5075 ensure that this lives as long as the rest of the struct decl.
5076 All decls in an inline function need to be saved. */
5078 space = ggc_alloc (sizeof (struct lang_type));
5079 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5083 field_array = &space2->elts[0];
5084 for (x = fieldlist; x; x = TREE_CHAIN (x))
5086 field_array[len++] = x;
5088 /* If there is anonymous struct or union, break out of the loop. */
5089 if (DECL_NAME (x) == NULL)
5092 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5095 TYPE_LANG_SPECIFIC (t) = space;
5096 TYPE_LANG_SPECIFIC (t)->s->len = len;
5097 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5098 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5103 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5105 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5106 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5107 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5108 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5111 /* If this was supposed to be a transparent union, but we can't
5112 make it one, warn and turn off the flag. */
5113 if (TREE_CODE (t) == UNION_TYPE
5114 && TYPE_TRANSPARENT_UNION (t)
5115 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5117 TYPE_TRANSPARENT_UNION (t) = 0;
5118 warning ("union cannot be made transparent");
5121 /* If this structure or union completes the type of any previous
5122 variable declaration, lay it out and output its rtl. */
5123 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5127 tree decl = TREE_VALUE (x);
5128 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5129 layout_array_type (TREE_TYPE (decl));
5130 if (TREE_CODE (decl) != TYPE_DECL)
5132 layout_decl (decl, 0);
5133 if (c_dialect_objc ())
5134 objc_check_decl (decl);
5135 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5140 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5142 /* Finish debugging output for this type. */
5143 rest_of_type_compilation (t, toplevel);
5148 /* Lay out the type T, and its element type, and so on. */
5151 layout_array_type (tree t)
5153 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5154 layout_array_type (TREE_TYPE (t));
5158 /* Begin compiling the definition of an enumeration type.
5159 NAME is its name (or null if anonymous).
5160 Returns the type object, as yet incomplete.
5161 Also records info about it so that build_enumerator
5162 may be used to declare the individual values as they are read. */
5165 start_enum (tree name)
5169 /* If this is the real definition for a previous forward reference,
5170 fill in the contents in the same object that used to be the
5171 forward reference. */
5174 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5176 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5178 enumtype = make_node (ENUMERAL_TYPE);
5179 pushtag (name, enumtype);
5182 C_TYPE_BEING_DEFINED (enumtype) = 1;
5184 if (TYPE_VALUES (enumtype) != 0)
5186 /* This enum is a named one that has been declared already. */
5187 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5189 /* Completely replace its old definition.
5190 The old enumerators remain defined, however. */
5191 TYPE_VALUES (enumtype) = 0;
5194 enum_next_value = integer_zero_node;
5197 if (flag_short_enums)
5198 TYPE_PACKED (enumtype) = 1;
5203 /* After processing and defining all the values of an enumeration type,
5204 install their decls in the enumeration type and finish it off.
5205 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5206 and ATTRIBUTES are the specified attributes.
5207 Returns ENUMTYPE. */
5210 finish_enum (tree enumtype, tree values, tree attributes)
5213 tree minnode = 0, maxnode = 0, enum_value_type;
5214 int precision, unsign;
5215 int toplevel = (global_scope == current_scope);
5217 if (in_parm_level_p ())
5218 warning ("enum defined inside parms");
5220 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5222 /* Calculate the maximum value of any enumerator in this type. */
5224 if (values == error_mark_node)
5225 minnode = maxnode = integer_zero_node;
5228 minnode = maxnode = TREE_VALUE (values);
5229 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5231 tree value = TREE_VALUE (pair);
5232 if (tree_int_cst_lt (maxnode, value))
5234 if (tree_int_cst_lt (value, minnode))
5239 /* Construct the final type of this enumeration. It is the same
5240 as one of the integral types - the narrowest one that fits, except
5241 that normally we only go as narrow as int - and signed iff any of
5242 the values are negative. */
5243 unsign = (tree_int_cst_sgn (minnode) >= 0);
5244 precision = MAX (min_precision (minnode, unsign),
5245 min_precision (maxnode, unsign));
5246 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5248 tree narrowest = c_common_type_for_size (precision, unsign);
5251 warning ("enumeration values exceed range of largest integer");
5252 narrowest = long_long_integer_type_node;
5255 precision = TYPE_PRECISION (narrowest);
5258 precision = TYPE_PRECISION (integer_type_node);
5260 if (precision == TYPE_PRECISION (integer_type_node))
5261 enum_value_type = c_common_type_for_size (precision, 0);
5263 enum_value_type = enumtype;
5265 TYPE_MIN_VALUE (enumtype) = minnode;
5266 TYPE_MAX_VALUE (enumtype) = maxnode;
5267 TYPE_PRECISION (enumtype) = precision;
5268 TREE_UNSIGNED (enumtype) = unsign;
5269 TYPE_SIZE (enumtype) = 0;
5270 layout_type (enumtype);
5272 if (values != error_mark_node)
5274 /* Change the type of the enumerators to be the enum type. We
5275 need to do this irrespective of the size of the enum, for
5276 proper type checking. Replace the DECL_INITIALs of the
5277 enumerators, and the value slots of the list, with copies
5278 that have the enum type; they cannot be modified in place
5279 because they may be shared (e.g. integer_zero_node) Finally,
5280 change the purpose slots to point to the names of the decls. */
5281 for (pair = values; pair; pair = TREE_CHAIN (pair))
5283 tree enu = TREE_PURPOSE (pair);
5285 TREE_TYPE (enu) = enumtype;
5287 /* The ISO C Standard mandates enumerators to have type int,
5288 even though the underlying type of an enum type is
5289 unspecified. Here we convert any enumerators that fit in
5290 an int to type int, to avoid promotions to unsigned types
5291 when comparing integers with enumerators that fit in the
5292 int range. When -pedantic is given, build_enumerator()
5293 would have already taken care of those that don't fit. */
5294 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5295 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5297 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5299 TREE_PURPOSE (pair) = DECL_NAME (enu);
5300 TREE_VALUE (pair) = DECL_INITIAL (enu);
5303 TYPE_VALUES (enumtype) = values;
5306 /* Fix up all variant types of this enum type. */
5307 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5309 if (tem == enumtype)
5311 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5312 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5313 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5314 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5315 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5316 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5317 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5318 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5319 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5320 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5323 /* Finish debugging output for this type. */
5324 rest_of_type_compilation (enumtype, toplevel);
5329 /* Build and install a CONST_DECL for one value of the
5330 current enumeration type (one that was begun with start_enum).
5331 Return a tree-list containing the CONST_DECL and its value.
5332 Assignment of sequential values by default is handled here. */
5335 build_enumerator (tree name, tree value)
5339 /* Validate and default VALUE. */
5341 /* Remove no-op casts from the value. */
5343 STRIP_TYPE_NOPS (value);
5347 if (TREE_CODE (value) == INTEGER_CST)
5349 value = default_conversion (value);
5350 constant_expression_warning (value);
5354 error ("enumerator value for `%s' not integer constant",
5355 IDENTIFIER_POINTER (name));
5360 /* Default based on previous value. */
5361 /* It should no longer be possible to have NON_LVALUE_EXPR
5365 value = enum_next_value;
5367 error ("overflow in enumeration values");
5370 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5372 pedwarn ("ISO C restricts enumerator values to range of `int'");
5373 value = convert (integer_type_node, value);
5376 /* Set basis for default for next value. */
5377 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5378 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5380 /* Now create a declaration for the enum value name. */
5382 type = TREE_TYPE (value);
5383 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5384 TYPE_PRECISION (integer_type_node)),
5385 (TYPE_PRECISION (type)
5386 >= TYPE_PRECISION (integer_type_node)
5387 && TREE_UNSIGNED (type)));
5389 decl = build_decl (CONST_DECL, name, type);
5390 DECL_INITIAL (decl) = convert (type, value);
5393 return tree_cons (decl, value, NULL_TREE);
5397 /* Create the FUNCTION_DECL for a function definition.
5398 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5399 the declaration; they describe the function's name and the type it returns,
5400 but twisted together in a fashion that parallels the syntax of C.
5402 This function creates a binding context for the function body
5403 as well as setting up the FUNCTION_DECL in current_function_decl.
5405 Returns 1 on success. If the DECLARATOR is not suitable for a function
5406 (it defines a datum instead), we return 0, which tells
5407 yyparse to report a parse error. */
5410 start_function (tree declspecs, tree declarator, tree attributes)
5412 tree decl1, old_decl;
5414 int old_immediate_size_expand = immediate_size_expand;
5416 current_function_returns_value = 0; /* Assume, until we see it does. */
5417 current_function_returns_null = 0;
5418 current_function_returns_abnormally = 0;
5419 warn_about_return_type = 0;
5420 current_extern_inline = 0;
5421 c_in_iteration_stmt = 0;
5424 /* Don't expand any sizes in the return type of the function. */
5425 immediate_size_expand = 0;
5427 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, NULL);
5429 /* If the declarator is not suitable for a function definition,
5430 cause a syntax error. */
5433 immediate_size_expand = old_immediate_size_expand;
5437 decl_attributes (&decl1, attributes, 0);
5439 if (DECL_DECLARED_INLINE_P (decl1)
5440 && DECL_UNINLINABLE (decl1)
5441 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5442 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5444 announce_function (decl1);
5446 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5448 error ("return type is an incomplete type");
5449 /* Make it return void instead. */
5451 = build_function_type (void_type_node,
5452 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5455 if (warn_about_return_type)
5456 pedwarn_c99 ("return type defaults to `int'");
5458 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5459 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5460 DECL_INITIAL (decl1) = error_mark_node;
5462 /* If this definition isn't a prototype and we had a prototype declaration
5463 before, copy the arg type info from that prototype.
5464 But not if what we had before was a builtin function. */
5465 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5466 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5467 && !DECL_BUILT_IN (old_decl)
5468 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5469 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5470 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5472 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5473 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5476 /* Optionally warn of old-fashioned def with no previous prototype. */
5477 if (warn_strict_prototypes
5478 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5479 && C_DECL_ISNT_PROTOTYPE (old_decl))
5480 warning ("function declaration isn't a prototype");
5481 /* Optionally warn of any global def with no previous prototype. */
5482 else if (warn_missing_prototypes
5483 && TREE_PUBLIC (decl1)
5484 && ! MAIN_NAME_P (DECL_NAME (decl1))
5485 && C_DECL_ISNT_PROTOTYPE (old_decl))
5486 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5487 /* Optionally warn of any def with no previous prototype
5488 if the function has already been used. */
5489 else if (warn_missing_prototypes
5490 && old_decl != 0 && TREE_USED (old_decl)
5491 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5492 warning ("%J'%D' was used with no prototype before its definition",
5494 /* Optionally warn of any global def with no previous declaration. */
5495 else if (warn_missing_declarations
5496 && TREE_PUBLIC (decl1)
5498 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5499 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5500 /* Optionally warn of any def with no previous declaration
5501 if the function has already been used. */
5502 else if (warn_missing_declarations
5503 && old_decl != 0 && TREE_USED (old_decl)
5504 && C_DECL_IMPLICIT (old_decl))
5505 warning ("%J`%D' was used with no declaration before its definition",
5508 /* This is a definition, not a reference.
5509 So normally clear DECL_EXTERNAL.
5510 However, `extern inline' acts like a declaration
5511 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5512 DECL_EXTERNAL (decl1) = current_extern_inline;
5514 /* This function exists in static storage.
5515 (This does not mean `static' in the C sense!) */
5516 TREE_STATIC (decl1) = 1;
5518 /* A nested function is not global. */
5519 if (current_function_decl != 0)
5520 TREE_PUBLIC (decl1) = 0;
5522 #ifdef ENABLE_CHECKING
5523 /* This is the earliest point at which we might know the assembler
5524 name of the function. Thus, if it's set before this, die horribly. */
5525 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5529 /* If #pragma weak was used, mark the decl weak now. */
5530 if (current_scope == global_scope)
5531 maybe_apply_pragma_weak (decl1);
5533 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5534 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5539 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5540 != integer_type_node)
5541 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5543 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5544 args = TREE_CHAIN (args))
5546 tree type = args ? TREE_VALUE (args) : 0;
5548 if (type == void_type_node)
5555 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5556 pedwarn ("%Jfirst argument of '%D' should be `int'",
5561 if (TREE_CODE (type) != POINTER_TYPE
5562 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5563 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5565 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5570 if (TREE_CODE (type) != POINTER_TYPE
5571 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5572 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5574 pedwarn ("%Jthird argument of '%D' should probably be "
5575 "'char **'", decl1, decl1);
5580 /* It is intentional that this message does not mention the third
5581 argument because it's only mentioned in an appendix of the
5583 if (argct > 0 && (argct < 2 || argct > 3))
5584 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5586 if (! TREE_PUBLIC (decl1))
5587 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5590 /* Record the decl so that the function name is defined.
5591 If we already have a decl for this name, and it is a FUNCTION_DECL,
5592 use the old decl. */
5594 current_function_decl = pushdecl (decl1);
5597 declare_parm_level ();
5599 make_decl_rtl (current_function_decl, NULL);
5601 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5602 /* Promote the value to int before returning it. */
5603 if (c_promoting_integer_type_p (restype))
5605 /* It retains unsignedness if not really getting wider. */
5606 if (TREE_UNSIGNED (restype)
5607 && (TYPE_PRECISION (restype)
5608 == TYPE_PRECISION (integer_type_node)))
5609 restype = unsigned_type_node;
5611 restype = integer_type_node;
5613 DECL_RESULT (current_function_decl)
5614 = build_decl (RESULT_DECL, NULL_TREE, restype);
5616 /* If this fcn was already referenced via a block-scope `extern' decl
5617 (or an implicit decl), propagate certain information about the usage. */
5618 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5619 TREE_ADDRESSABLE (current_function_decl) = 1;
5621 immediate_size_expand = old_immediate_size_expand;
5623 start_fname_decls ();
5628 /* Subroutine of store_parm_decls which handles new-style function
5629 definitions (prototype format). The parms already have decls, so we
5630 need only record them as in effect and complain if any redundant
5631 old-style parm decls were written. */
5633 store_parm_decls_newstyle (tree fndecl, tree arg_info)
5637 tree parms = ARG_INFO_PARMS (arg_info);
5638 tree tags = ARG_INFO_TAGS (arg_info);
5639 tree others = ARG_INFO_OTHERS (arg_info);
5641 if (current_scope->parms || current_scope->names || current_scope->tags)
5643 error ("%Jold-style parameter declarations in prototyped "
5644 "function definition", fndecl);
5646 /* Get rid of the old-style declarations. */
5651 /* Now make all the parameter declarations visible in the function body.
5652 We can bypass most of the grunt work of pushdecl. */
5653 for (last = 0, decl = parms; decl; last = decl, decl = TREE_CHAIN (decl))
5655 DECL_CONTEXT (decl) = current_function_decl;
5656 if (DECL_NAME (decl) == 0)
5657 error ("%Jparameter name omitted", decl);
5660 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5661 current_scope->shadowed
5662 = tree_cons (DECL_NAME (decl),
5663 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5664 current_scope->shadowed);
5665 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5668 current_scope->parms = parms;
5669 current_scope->parms_last = last;
5671 /* Record the parameter list in the function declaration. */
5672 DECL_ARGUMENTS (fndecl) = parms;
5674 /* Now make all the ancillary declarations visible, likewise. */
5675 for (last = 0, decl = others; decl; last = decl, decl = TREE_CHAIN (decl))
5677 DECL_CONTEXT (decl) = current_function_decl;
5678 if (DECL_NAME (decl)
5679 && TYPE_MAIN_VARIANT (TREE_TYPE (decl)) != void_type_node)
5681 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5682 current_scope->shadowed
5683 = tree_cons (DECL_NAME (decl),
5684 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5685 current_scope->shadowed);
5686 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5689 current_scope->names = others;
5690 current_scope->names_last = last;
5692 /* And all the tag declarations. */
5693 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5694 if (TREE_PURPOSE (decl))
5696 if (IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)))
5697 current_scope->shadowed_tags
5698 = tree_cons (TREE_PURPOSE (decl),
5699 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (decl)),
5700 current_scope->shadowed_tags);
5701 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)) = TREE_VALUE (decl);
5703 current_scope->tags = tags;
5706 /* Subroutine of store_parm_decls which handles old-style function
5707 definitions (separate parameter list and declarations). */
5710 store_parm_decls_oldstyle (tree fndecl, tree arg_info)
5712 tree parm, decl, last;
5714 /* This is the identifier list from the function declarator. */
5715 tree parmids = ARG_INFO_PARMS (arg_info);
5717 /* We use DECL_WEAK as a flag to show which parameters have been
5718 seen already, since it is not used on PARM_DECL. */
5719 #ifdef ENABLE_CHECKING
5720 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5721 if (DECL_WEAK (parm))
5725 /* Match each formal parameter name with its declaration. Save each
5726 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5727 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5729 if (TREE_VALUE (parm) == 0)
5731 error ("%Jparameter name missing from parameter list", fndecl);
5732 TREE_PURPOSE (parm) = 0;
5736 decl = IDENTIFIER_SYMBOL_VALUE (TREE_VALUE (parm));
5737 if (decl && DECL_CONTEXT (decl) == fndecl)
5739 /* If we got something other than a PARM_DECL it is an error. */
5740 if (TREE_CODE (decl) != PARM_DECL)
5741 error ("%J\"%D\" declared as a non-parameter", decl, decl);
5742 /* If the declaration is already marked, we have a duplicate
5743 name. Complain and ignore the duplicate. */
5744 else if (DECL_WEAK (decl))
5746 error ("%Jmultiple parameters named \"%D\"", decl, decl);
5747 TREE_PURPOSE (parm) = 0;
5750 /* If the declaration says "void", complain and turn it into
5752 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5754 error ("%Jparameter \"%D\" declared void", decl, decl);
5755 TREE_TYPE (decl) = integer_type_node;
5756 DECL_ARG_TYPE (decl) = integer_type_node;
5757 layout_decl (decl, 0);
5760 /* If no declaration found, default to int. */
5763 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5764 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5765 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5769 pedwarn ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5770 else if (extra_warnings)
5771 warning ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5774 TREE_PURPOSE (parm) = decl;
5775 DECL_WEAK (decl) = 1;
5778 /* Now examine the parms chain for incomplete declarations
5779 and declarations with no corresponding names. */
5781 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5783 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5785 error ("%Jparameter \"%D\" has incomplete type", parm, parm);
5786 TREE_TYPE (parm) = error_mark_node;
5789 if (! DECL_WEAK (parm))
5791 error ("%Jdeclaration for parameter \"%D\" but no such parameter",
5794 /* Pretend the parameter was not missing.
5795 This gets us to a standard state and minimizes
5796 further error messages. */
5797 parmids = chainon (parmids, tree_cons (parm, 0, 0));
5801 /* Chain the declarations together in the order of the list of
5802 names. Store that chain in the function decl, replacing the
5803 list of names. Update the current scope to match. */
5804 DECL_ARGUMENTS (fndecl) = 0;
5806 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5807 if (TREE_PURPOSE (parm))
5809 if (parm && TREE_PURPOSE (parm))
5811 last = TREE_PURPOSE (parm);
5812 DECL_ARGUMENTS (fndecl) = last;
5813 current_scope->parms = last;
5814 DECL_WEAK (last) = 0;
5816 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
5817 if (TREE_PURPOSE (parm))
5819 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5820 last = TREE_PURPOSE (parm);
5821 DECL_WEAK (last) = 0;
5823 current_scope->parms_last = last;
5824 TREE_CHAIN (last) = 0;
5827 /* If there was a previous prototype,
5828 set the DECL_ARG_TYPE of each argument according to
5829 the type previously specified, and report any mismatches. */
5831 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5834 for (parm = DECL_ARGUMENTS (fndecl),
5835 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5836 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5837 != void_type_node));
5838 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5840 if (parm == 0 || type == 0
5841 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5843 error ("number of arguments doesn't match prototype");
5844 error ("%Hprototype declaration",
5845 ¤t_function_prototype_locus);
5848 /* Type for passing arg must be consistent with that
5849 declared for the arg. ISO C says we take the unqualified
5850 type for parameters declared with qualified type. */
5851 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5852 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
5855 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5856 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5858 /* Adjust argument to match prototype. E.g. a previous
5859 `int foo(float);' prototype causes
5860 `int foo(x) float x; {...}' to be treated like
5861 `int foo(float x) {...}'. This is particularly
5862 useful for argument types like uid_t. */
5863 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5865 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
5866 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5867 && TYPE_PRECISION (TREE_TYPE (parm))
5868 < TYPE_PRECISION (integer_type_node))
5869 DECL_ARG_TYPE (parm) = integer_type_node;
5873 pedwarn ("promoted argument \"%D\" "
5874 "doesn't match prototype", parm);
5875 pedwarn ("%Hprototype declaration",
5876 ¤t_function_prototype_locus);
5881 error ("argument \"%D\" doesn't match prototype", parm);
5882 error ("%Hprototype declaration",
5883 ¤t_function_prototype_locus);
5887 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5890 /* Otherwise, create a prototype that would match. */
5894 tree actual = 0, last = 0, type;
5896 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5898 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
5900 TREE_CHAIN (last) = type;
5905 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5907 TREE_CHAIN (last) = type;
5911 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5912 of the type of this function, but we need to avoid having this
5913 affect the types of other similarly-typed functions, so we must
5914 first force the generation of an identical (but separate) type
5915 node for the relevant function type. The new node we create
5916 will be a variant of the main variant of the original function
5919 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5921 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5925 /* Store the parameter declarations into the current function declaration.
5926 This is called after parsing the parameter declarations, before
5927 digesting the body of the function.
5929 For an old-style definition, construct a prototype out of the old-style
5930 parameter declarations and inject it into the function's type. */
5933 store_parm_decls (void)
5935 tree fndecl = current_function_decl;
5937 /* The function containing FNDECL, if any. */
5938 tree context = decl_function_context (fndecl);
5940 /* The argument information block for FNDECL. */
5941 tree arg_info = DECL_ARGUMENTS (fndecl);
5943 /* True if this definition is written with a prototype. Since this
5944 is a function definition, we can treat a null parameter list
5945 (i.e. "foo()") as prototyped (C99 6.7.5.3p14) - this reduces
5947 bool prototype = (!ARG_INFO_PARMS (arg_info)
5948 || TREE_CODE (ARG_INFO_PARMS (arg_info)) != TREE_LIST);
5951 store_parm_decls_newstyle (fndecl, arg_info);
5953 store_parm_decls_oldstyle (fndecl, arg_info);
5955 /* The next call to pushlevel will be a function body. */
5957 next_is_function_body = true;
5959 /* Write a record describing this function definition to the prototypes
5960 file (if requested). */
5962 gen_aux_info_record (fndecl, 1, 0, prototype);
5964 /* Initialize the RTL code for the function. */
5965 allocate_struct_function (fndecl);
5967 /* Begin the statement tree for this function. */
5968 begin_stmt_tree (&DECL_SAVED_TREE (fndecl));
5970 /* If this is a nested function, save away the sizes of any
5971 variable-size types so that we can expand them when generating
5977 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
5978 = nreverse (get_pending_sizes ());
5979 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
5982 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
5985 /* This function is being processed in whole-function mode. */
5986 cfun->x_whole_function_mode_p = 1;
5988 /* Even though we're inside a function body, we still don't want to
5989 call expand_expr to calculate the size of a variable-sized array.
5990 We haven't necessarily assigned RTL to all variables yet, so it's
5991 not safe to try to expand expressions involving them. */
5992 immediate_size_expand = 0;
5993 cfun->x_dont_save_pending_sizes_p = 1;
5996 /* Finish up a function declaration and compile that function
5997 all the way to assembler language output. The free the storage
5998 for the function definition.
6000 This is called after parsing the body of the function definition. */
6003 finish_function (void)
6005 tree fndecl = current_function_decl;
6007 /* When a function declaration is totally empty, e.g.
6009 (the argument list is irrelevant) the compstmt rule will not
6010 bother calling pushlevel/poplevel, which means we get here with
6011 the scope stack out of sync. Detect this situation by noticing
6012 that current_scope is still as store_parm_decls left it, and do
6013 a dummy push/pop to get back to consistency.
6014 Note that the call to pushlevel does not actually push another
6015 scope - see there for details. */
6017 if (current_scope->parm_flag && next_is_function_body)
6023 if (TREE_CODE (fndecl) == FUNCTION_DECL
6024 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6026 tree args = DECL_ARGUMENTS (fndecl);
6027 for (; args; args = TREE_CHAIN (args))
6029 tree type = TREE_TYPE (args);
6030 if (INTEGRAL_TYPE_P (type)
6031 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6032 DECL_ARG_TYPE (args) = integer_type_node;
6036 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6037 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6039 /* Must mark the RESULT_DECL as being in this function. */
6041 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6042 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6044 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6046 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6047 != integer_type_node)
6049 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6050 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6052 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6056 #ifdef DEFAULT_MAIN_RETURN
6057 /* Make it so that `main' always returns success by default. */
6058 DEFAULT_MAIN_RETURN;
6061 c_expand_return (integer_zero_node);
6066 finish_fname_decls ();
6068 /* Tie off the statement tree for this function. */
6069 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6071 /* Complain if there's just no return statement. */
6072 if (warn_return_type
6073 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6074 && !current_function_returns_value && !current_function_returns_null
6075 /* Don't complain if we abort. */
6076 && !current_function_returns_abnormally
6077 /* Don't warn for main(). */
6078 && !MAIN_NAME_P (DECL_NAME (fndecl))
6079 /* Or if they didn't actually specify a return type. */
6080 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6081 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6082 inline function, as we might never be compiled separately. */
6083 && DECL_INLINE (fndecl))
6084 warning ("no return statement in function returning non-void");
6086 /* With just -Wextra, complain only if function returns both with
6087 and without a value. */
6089 && current_function_returns_value
6090 && current_function_returns_null)
6091 warning ("this function may return with or without a value");
6093 /* We're leaving the context of this function, so zap cfun.
6094 It's still in DECL_STRUCT_FUNCTION , and we'll restore it in
6095 tree_rest_of_compilation. */
6098 /* ??? Objc emits functions after finalizing the compilation unit.
6099 This should be cleaned up later and this conditional removed. */
6100 if (!cgraph_global_info_ready)
6101 cgraph_finalize_function (fndecl, false);
6103 c_expand_body (fndecl);
6104 current_function_decl = NULL;
6107 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6108 then we are already in the process of generating RTL for another
6112 c_expand_body_1 (tree fndecl, int nested_p)
6116 /* Make sure that we will evaluate variable-sized types involved
6117 in our function's type. */
6118 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6120 /* Squirrel away our current state. */
6121 push_function_context ();
6124 tree_rest_of_compilation (fndecl, nested_p);
6127 /* Return to the enclosing function. */
6128 pop_function_context ();
6130 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6132 if (targetm.have_ctors_dtors)
6133 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6134 DEFAULT_INIT_PRIORITY);
6136 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6139 if (DECL_STATIC_DESTRUCTOR (fndecl))
6141 if (targetm.have_ctors_dtors)
6142 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6143 DEFAULT_INIT_PRIORITY);
6145 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6149 /* Like c_expand_body_1 but only for unnested functions. */
6152 c_expand_body (tree fndecl)
6155 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6156 c_expand_body_1 (fndecl, 0);
6159 /* Check the declarations given in a for-loop for satisfying the C99
6162 check_for_loop_decls (void)
6168 /* If we get here, declarations have been used in a for loop without
6169 the C99 for loop scope. This doesn't make much sense, so don't
6171 error ("'for' loop initial declaration used outside C99 mode");
6174 /* C99 subclause 6.8.5 paragraph 3:
6176 [#3] The declaration part of a for statement shall only
6177 declare identifiers for objects having storage class auto or
6180 It isn't clear whether, in this sentence, "identifiers" binds to
6181 "shall only declare" or to "objects" - that is, whether all identifiers
6182 declared must be identifiers for objects, or whether the restriction
6183 only applies to those that are. (A question on this in comp.std.c
6184 in November 2000 received no answer.) We implement the strictest
6185 interpretation, to avoid creating an extension which later causes
6188 for (t = current_scope->tags; t; t = TREE_CHAIN (t))
6190 if (TREE_PURPOSE (t) != 0)
6192 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6194 if (code == RECORD_TYPE)
6195 error ("'struct %s' declared in 'for' loop initial declaration",
6196 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6197 else if (code == UNION_TYPE)
6198 error ("'union %s' declared in 'for' loop initial declaration",
6199 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6201 error ("'enum %s' declared in 'for' loop initial declaration",
6202 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6206 for (t = current_scope->names; t; t = TREE_CHAIN (t))
6208 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6209 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6210 "initial declaration", t, t);
6211 else if (TREE_STATIC (t))
6212 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6213 "initial declaration", t, t);
6214 else if (DECL_EXTERNAL (t))
6215 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6216 "initial declaration", t, t);
6220 /* Save and reinitialize the variables
6221 used during compilation of a C function. */
6224 c_push_function_context (struct function *f)
6226 struct language_function *p;
6227 p = ggc_alloc (sizeof (struct language_function));
6230 p->base.x_stmt_tree = c_stmt_tree;
6231 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6232 p->x_in_iteration_stmt = c_in_iteration_stmt;
6233 p->x_in_case_stmt = c_in_case_stmt;
6234 p->returns_value = current_function_returns_value;
6235 p->returns_null = current_function_returns_null;
6236 p->returns_abnormally = current_function_returns_abnormally;
6237 p->warn_about_return_type = warn_about_return_type;
6238 p->extern_inline = current_extern_inline;
6241 /* Restore the variables used during compilation of a C function. */
6244 c_pop_function_context (struct function *f)
6246 struct language_function *p = f->language;
6248 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6249 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6251 /* Stop pointing to the local nodes about to be freed. */
6252 /* But DECL_INITIAL must remain nonzero so we know this
6253 was an actual function definition. */
6254 DECL_INITIAL (current_function_decl) = error_mark_node;
6255 DECL_ARGUMENTS (current_function_decl) = 0;
6258 c_stmt_tree = p->base.x_stmt_tree;
6259 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6260 c_in_iteration_stmt = p->x_in_iteration_stmt;
6261 c_in_case_stmt = p->x_in_case_stmt;
6262 current_function_returns_value = p->returns_value;
6263 current_function_returns_null = p->returns_null;
6264 current_function_returns_abnormally = p->returns_abnormally;
6265 warn_about_return_type = p->warn_about_return_type;
6266 current_extern_inline = p->extern_inline;
6271 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6274 c_dup_lang_specific_decl (tree decl)
6276 struct lang_decl *ld;
6278 if (!DECL_LANG_SPECIFIC (decl))
6281 ld = ggc_alloc (sizeof (struct lang_decl));
6282 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6283 DECL_LANG_SPECIFIC (decl) = ld;
6286 /* The functions below are required for functionality of doing
6287 function at once processing in the C front end. Currently these
6288 functions are not called from anywhere in the C front end, but as
6289 these changes continue, that will change. */
6291 /* Returns nonzero if the current statement is a full expression,
6292 i.e. temporaries created during that statement should be destroyed
6293 at the end of the statement. */
6296 stmts_are_full_exprs_p (void)
6301 /* Returns the stmt_tree (if any) to which statements are currently
6302 being added. If there is no active statement-tree, NULL is
6306 current_stmt_tree (void)
6308 return &c_stmt_tree;
6311 /* Returns the stack of SCOPE_STMTs for the current function. */
6314 current_scope_stmt_stack (void)
6316 return &c_scope_stmt_stack;
6319 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6323 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6328 /* Dummy function in place of callback used by C++. */
6331 extract_interface_info (void)
6335 /* Return a new COMPOUND_STMT, after adding it to the current
6339 c_begin_compound_stmt (void)
6343 /* Create the COMPOUND_STMT. */
6344 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6349 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6353 c_expand_decl_stmt (tree t)
6355 tree decl = DECL_STMT_DECL (t);
6357 /* Expand nested functions. */
6358 if (TREE_CODE (decl) == FUNCTION_DECL
6359 && DECL_CONTEXT (decl) == current_function_decl
6360 && DECL_SAVED_TREE (decl))
6361 c_expand_body_1 (decl, 1);
6364 /* Return the global value of T as a symbol. */
6367 identifier_global_value (tree t)
6369 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6370 if (decl == 0 || DECL_FILE_SCOPE_P (decl))
6373 /* Shadowed by something else; find the true global value. */
6374 for (decl = global_scope->names; decl; decl = TREE_CHAIN (decl))
6375 if (DECL_NAME (decl) == t)
6378 /* Only local values for this decl. */
6382 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6383 otherwise the name is found in ridpointers from RID_INDEX. */
6386 record_builtin_type (enum rid rid_index, const char *name, tree type)
6391 id = ridpointers[(int) rid_index];
6393 id = get_identifier (name);
6394 tdecl = build_decl (TYPE_DECL, id, type);
6396 debug_hooks->type_decl (tdecl, 0);
6399 /* Build the void_list_node (void_type_node having been created). */
6401 build_void_list_node (void)
6403 tree t = build_tree_list (NULL_TREE, void_type_node);
6407 /* Return something to represent absolute declarators containing a *.
6408 TARGET is the absolute declarator that the * contains.
6409 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6410 to apply to the pointer type, represented as identifiers, possible mixed
6413 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6414 if attributes are present) and whose type is the modifier list. */
6417 make_pointer_declarator (tree type_quals_attrs, tree target)
6420 tree itarget = target;
6421 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6422 if (attrs != NULL_TREE)
6423 itarget = tree_cons (attrs, target, NULL_TREE);
6424 return build1 (INDIRECT_REF, quals, itarget);
6427 /* A wrapper around lhd_set_decl_assembler_name that gives static
6428 variables their C names if they are at file scope and only one
6429 translation unit is being compiled, for backwards compatibility
6430 with certain bizarre assembler hacks (like crtstuff.c). */
6433 c_static_assembler_name (tree decl)
6435 if (num_in_fnames == 1
6436 && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6437 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6438 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6440 lhd_set_decl_assembler_name (decl);
6443 /* Hash and equality functions for link_hash_table: key off
6444 DECL_ASSEMBLER_NAME. */
6447 link_hash_hash (const void *x_p)
6450 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6454 link_hash_eq (const void *x1_p, const void *x2_p)
6456 tree x1 = (tree)x1_p;
6457 tree x2 = (tree)x2_p;
6458 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6461 /* Propagate information between definitions and uses between multiple
6462 translation units in TU_LIST based on linkage rules. */
6465 merge_translation_unit_decls (void)
6467 const tree tu_list = current_file_decl;
6470 htab_t link_hash_table;
6473 /* Create the BLOCK that poplevel would have created, but don't
6474 actually call poplevel since that's expensive. */
6475 block = make_node (BLOCK);
6476 BLOCK_VARS (block) = current_scope->names;
6477 TREE_USED (block) = 1;
6478 DECL_INITIAL (current_file_decl) = block;
6480 /* If only one translation unit seen, no copying necessary. */
6481 if (TREE_CHAIN (tu_list) == NULL_TREE)
6484 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6486 /* Enter any actual definitions into the hash table. */
6487 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6488 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6489 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6492 slot = htab_find_slot (link_hash_table, decl, INSERT);
6494 /* If we've already got a definition, work out which one is
6495 the real one, put it into the hash table, and make the
6496 other one DECL_EXTERNAL. This is important to avoid
6497 putting out two definitions of the same symbol in the
6501 tree old_decl = (tree) *slot;
6503 /* If this is weak or common or whatever, suppress it
6504 in favor of the other definition. */
6505 if (DECL_WEAK (decl))
6506 DECL_EXTERNAL (decl) = 1;
6507 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6508 DECL_EXTERNAL (old_decl) = 1;
6509 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6510 DECL_EXTERNAL (decl) = 1;
6511 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6512 DECL_EXTERNAL (old_decl) = 1;
6514 if (DECL_EXTERNAL (decl))
6516 DECL_INITIAL (decl) = NULL_TREE;
6517 DECL_COMMON (decl) = 0;
6518 DECL_ONE_ONLY (decl) = 0;
6519 DECL_WEAK (decl) = 0;
6521 else if (DECL_EXTERNAL (old_decl))
6523 DECL_INITIAL (old_decl) = NULL_TREE;
6524 DECL_COMMON (old_decl) = 0;
6525 DECL_ONE_ONLY (old_decl) = 0;
6526 DECL_WEAK (old_decl) = 0;
6531 error ("%Jredefinition of global '%D'", decl, decl);
6532 error ("%J'%D' previously defined here", old_decl, old_decl);
6539 /* Now insert the desired information from all the definitions
6540 into any plain declarations. */
6541 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6542 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6543 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6546 global_decl = htab_find (link_hash_table, decl);
6551 /* Print any appropriate error messages, and partially merge
6553 (void) duplicate_decls (decl, global_decl);
6556 htab_delete (link_hash_table);
6559 /* Perform final processing on file-scope data. */
6562 c_write_global_declarations(void)
6566 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6568 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6569 int len = list_length (globals);
6570 tree *vec = xmalloc (sizeof (tree) * len);
6574 /* Process the decls in the order they were written. */
6576 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6579 wrapup_global_declarations (vec, len);
6581 check_global_declarations (vec, len);
6588 /* Reset the parser's state in preparation for a new file. */
6591 c_reset_state (void)
6594 tree file_scope_decl;
6596 /* Pop the global scope. */
6597 if (current_scope != global_scope)
6598 current_scope = global_scope;
6599 file_scope_decl = current_file_decl;
6600 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6601 BLOCK_SUPERCONTEXT (DECL_INITIAL (file_scope_decl)) = file_scope_decl;
6602 truly_local_externals = NULL_TREE;
6604 /* Start a new global binding level. */
6606 global_scope = current_scope;
6607 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6608 TREE_CHAIN (current_file_decl) = file_scope_decl;
6610 /* Reintroduce the builtin declarations. */
6611 for (link = first_builtin_decl;
6612 link != TREE_CHAIN (last_builtin_decl);
6613 link = TREE_CHAIN (link))
6614 pushdecl (copy_node (link));
6617 #include "gt-c-decl.h"