1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
35 #include "tree-inline.h"
55 #include "langhooks-def.h"
57 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
59 { NORMAL, /* Ordinary declaration */
60 FUNCDEF, /* Function definition */
61 PARM, /* Declaration of parm before function body */
62 FIELD, /* Declaration inside struct or union */
63 BITFIELD, /* Likewise but with specified width */
64 TYPENAME}; /* Typename (inside cast or sizeof) */
67 /* Nonzero if we have seen an invalid cross reference
68 to a struct, union, or enum, but not yet printed the message. */
70 tree pending_invalid_xref;
71 /* File and line to appear in the eventual error message. */
72 location_t pending_invalid_xref_location;
74 /* While defining an enum type, this is 1 plus the last enumerator
75 constant value. Note that will do not have to save this or `enum_overflow'
76 around nested function definition since such a definition could only
77 occur in an enum value expression and we don't use these variables in
80 static tree enum_next_value;
82 /* Nonzero means that there was overflow computing enum_next_value. */
84 static int enum_overflow;
86 /* Parsing a function declarator leaves a list of parameter names
87 or a chain of parameter decls here. */
89 static tree last_function_parms;
91 /* Parsing a function declarator leaves a chain of structure
92 and enum types declared in the parmlist here. */
94 static tree last_function_parm_tags;
96 /* After parsing the declarator that starts a function definition,
97 `start_function' puts the list of parameter names or chain of decls here
98 for `store_parm_decls' to find. */
100 static tree current_function_parms;
102 /* Similar, for last_function_parm_tags. */
104 static tree current_function_parm_tags;
106 /* Similar, for the file and line that the prototype came from if this is
107 an old-style definition. */
109 static location_t current_function_prototype_locus;
111 /* The current statement tree. */
113 static GTY(()) struct stmt_tree_s c_stmt_tree;
115 /* The current scope statement stack. */
117 static GTY(()) tree c_scope_stmt_stack;
119 /* A list of external DECLs that appeared at block scope when there was
120 some other global meaning for that identifier. */
121 static GTY(()) tree truly_local_externals;
123 /* A list of the builtin file-scope DECLs. */
125 static GTY(()) tree builtin_decls;
127 /* A DECL for the current file-scope context. */
129 static GTY(()) tree current_file_decl;
131 /* Set to 0 at beginning of a function definition, set to 1 if
132 a return statement that specifies a return value is seen. */
134 int current_function_returns_value;
136 /* Set to 0 at beginning of a function definition, set to 1 if
137 a return statement with no argument is seen. */
139 int current_function_returns_null;
141 /* Set to 0 at beginning of a function definition, set to 1 if
142 a call to a noreturn function is seen. */
144 int current_function_returns_abnormally;
146 /* Set to nonzero by `grokdeclarator' for a function
147 whose return type is defaulted, if warnings for this are desired. */
149 static int warn_about_return_type;
151 /* Nonzero when starting a function declared `extern inline'. */
153 static int current_extern_inline;
155 /* For each binding contour we allocate a c_scope structure
156 * which records the names defined in that contour.
159 * 1) one for each function definition,
160 * where internal declarations of the parameters appear.
161 * 2) one for each compound statement,
162 * to record its declarations.
164 * The current meaning of a name can be found by searching the nested
165 * scopes from the current one out to the global one.
168 struct c_scope GTY(())
170 /* A chain of _DECL nodes for all variables, constants, functions,
171 and typedef types. These are in the reverse of the order supplied.
175 /* A list of structure, union and enum definitions,
176 * for looking up tag names.
177 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
178 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
179 * or ENUMERAL_TYPE node.
183 /* For each scope, a list of shadowed outer-scope definitions
184 to be restored when this scope is popped.
185 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
186 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
189 /* For each scope, a list of shadowed outer-scope tag definitions
190 to be restored when this scope is popped.
191 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
192 whose TREE_VALUE is its old definition (a kind of ..._TYPE node). */
195 /* For each scope (except not the global one),
196 a chain of BLOCK nodes for all the scopes
197 that were entered and exited one level down. */
200 /* The scope containing this one. */
201 struct c_scope *outer;
203 /* The next outermost function scope. */
204 struct c_scope *outer_function;
206 /* True if we are currently filling this scope with parameter
210 /* True if this is the outermost block scope of a function body.
211 This scope contains both the parameters and the local variables
212 declared in the outermost block. */
213 bool function_body : 1;
215 /* True means make a BLOCK for this scope regardless of all else. */
218 /* True means make a BLOCK if this scope has any subblocks. */
219 bool keep_if_subblocks : 1;
221 /* List of decls in `names' that have incomplete structure or
223 tree incomplete_list;
225 /* A list of decls giving the (reversed) specified order of parms,
226 not including any forward-decls in the parmlist.
227 This is so we can put the parms in proper order for assign_parms. */
231 /* The scope currently in effect. */
233 static GTY(()) struct c_scope *current_scope;
235 /* A chain of c_scope structures awaiting reuse. */
237 static GTY((deletable (""))) struct c_scope *scope_freelist;
239 /* The innermost function scope. Ordinary (not explicitly declared)
240 labels, bindings to error_mark_node, and the lazily-created
241 bindings of __func__ and its friends get this scope. */
242 static GTY(()) struct c_scope *current_function_scope;
244 /* The outermost scope, corresponding to the C "file scope". This is
245 created when the compiler is started and exists through the entire run. */
247 static GTY(()) struct c_scope *global_scope;
249 /* True means unconditionally make a BLOCK for the next scope pushed. */
251 static bool keep_next_level_flag;
253 /* True means make a BLOCK for the next scope pushed if it has subblocks. */
255 static bool keep_next_if_subblocks;
257 /* Functions called automatically at the beginning and end of execution. */
259 tree static_ctors, static_dtors;
261 /* Forward declarations. */
263 static struct c_scope *make_scope (void);
264 static void pop_scope (void);
265 static tree match_builtin_function_types (tree, tree);
266 static int duplicate_decls (tree, tree, int, int);
267 static int redeclaration_error_message (tree, tree);
268 static tree make_label (tree, location_t);
269 static void bind_label (tree, tree, struct c_scope *);
270 static void implicit_decl_warning (tree);
271 static void storedecls (tree);
272 static void storetags (tree);
273 static tree lookup_tag (enum tree_code, tree, int);
274 static tree lookup_name_current_level (tree);
275 static tree grokdeclarator (tree, tree, enum decl_context, int);
276 static tree grokparms (tree, int);
277 static void layout_array_type (tree);
278 static void store_parm_decls_newstyle (void);
279 static void store_parm_decls_oldstyle (void);
280 static tree c_make_fname_decl (tree, int);
281 static void c_expand_body_1 (tree, int);
282 static tree any_external_decl (tree);
283 static void record_external_decl (tree);
284 static void warn_if_shadowing (tree, tree);
285 static void clone_underlying_type (tree);
286 static void pushdecl_function_level (tree, tree);
287 static bool flexible_array_type_p (tree);
288 static hashval_t link_hash_hash (const void *);
289 static int link_hash_eq (const void *, const void *);
291 /* States indicating how grokdeclarator() should handle declspecs marked
292 with __attribute__((deprecated)). An object declared as
293 __attribute__((deprecated)) suppresses warnings of uses of other
296 enum deprecated_states {
301 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
304 c_print_identifier (FILE *file, tree node, int indent)
306 print_node (file, "symbol", IDENTIFIER_SYMBOL_VALUE (node), indent + 4);
307 print_node (file, "tag", IDENTIFIER_TAG_VALUE (node), indent + 4);
308 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
309 if (C_IS_RESERVED_WORD (node))
311 tree rid = ridpointers[C_RID_CODE (node)];
312 indent_to (file, indent + 4);
313 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
314 (void *) rid, IDENTIFIER_POINTER (rid));
318 /* Hook called at end of compilation to assume 1 elt
319 for a file-scope tentative array defn that wasn't complete before. */
322 c_finish_incomplete_decl (tree decl)
324 if (TREE_CODE (decl) == VAR_DECL)
326 tree type = TREE_TYPE (decl);
327 if (type != error_mark_node
328 && TREE_CODE (type) == ARRAY_TYPE
329 && ! DECL_EXTERNAL (decl)
330 && TYPE_DOMAIN (type) == 0)
332 warning ("%Harray '%D' assumed to have one element",
333 &DECL_SOURCE_LOCATION (decl), decl);
335 complete_array_type (type, NULL_TREE, 1);
337 layout_decl (decl, 0);
342 /* Reuse or create a struct for this scope. */
344 static struct c_scope *
347 struct c_scope *result;
350 result = scope_freelist;
351 scope_freelist = result->outer;
354 result = ggc_alloc_cleared (sizeof (struct c_scope));
359 /* Remove the topmost scope from the stack and add it to the
360 free list, updating current_function_scope if necessary. */
365 struct c_scope *scope = current_scope;
367 current_scope = scope->outer;
368 if (scope->function_body)
369 current_function_scope = scope->outer_function;
371 memset (scope, 0, sizeof (struct c_scope));
372 scope->outer = scope_freelist;
373 scope_freelist = scope;
376 /* Nonzero if we are currently in the global scope. */
379 global_bindings_p (void)
381 return current_scope == global_scope;
385 keep_next_level (void)
387 keep_next_level_flag = true;
390 /* Identify this scope as currently being filled with parameters. */
393 declare_parm_level (void)
395 current_scope->parm_flag = true;
398 /* Nonzero if currently making parm declarations. */
401 in_parm_level_p (void)
403 return current_scope->parm_flag;
406 /* Enter a new scope. */
409 pushlevel (int dummy ATTRIBUTE_UNUSED)
411 if (keep_next_if_subblocks)
413 /* This is the transition from the parameters to the top level
414 of the function body. These are the same scope
415 (C99 6.2.1p4,6) so we do not push another scope structure.
417 XXX Note kludge - keep_next_if_subblocks is set only by
418 store_parm_decls, which in turn is called when and only
419 when we are about to encounter the opening curly brace for
420 the function body. */
421 current_scope->parm_flag = false;
422 current_scope->function_body = true;
423 current_scope->keep |= keep_next_level_flag;
424 current_scope->keep_if_subblocks = true;
425 current_scope->outer_function = current_function_scope;
426 current_function_scope = current_scope;
428 keep_next_level_flag = false;
429 keep_next_if_subblocks = false;
433 struct c_scope *scope = make_scope ();
435 scope->keep = keep_next_level_flag;
436 scope->outer = current_scope;
437 current_scope = scope;
438 keep_next_level_flag = false;
442 /* Exit a scope. Restore the state of the identifier-decl mappings
443 that were in effect when this scope was entered.
445 If KEEP is KEEP_YES (1), this scope had explicit declarations, so
446 create a BLOCK node to record its declarations and subblocks for
447 debugging output. If KEEP is KEEP_MAYBE, do so only if the names
448 or tags lists are nonempty.
450 If FUNCTIONBODY is nonzero, this level is the body of a function,
451 so create a block as if KEEP were set and also clear out all
454 If REVERSE is nonzero, reverse the order of decls before putting
455 them into the BLOCK. */
458 poplevel (int keep, int reverse, int functionbody)
463 tree decls = current_scope->names;
464 tree tags = current_scope->tags;
465 tree subblocks = current_scope->blocks;
467 functionbody |= current_scope->function_body;
469 if (keep == KEEP_MAYBE)
470 keep = (current_scope->names || current_scope->tags);
472 keep |= (current_scope->keep || functionbody
473 || (subblocks && current_scope->keep_if_subblocks));
475 /* We used to warn about unused variables in expand_end_bindings,
476 i.e. while generating RTL. But in function-at-a-time mode we may
477 choose to never expand a function at all (e.g. auto inlining), so
478 we do this explicitly now.
479 No warnings when the global scope is popped because the global
480 scope isn't popped for the last translation unit, so the warnings
481 are done in c_write_global_declaration. */
482 if (current_scope != global_scope)
483 warn_about_unused_variables (decls);
485 /* Clear out the name-meanings declared in this scope.
486 Propagate TREE_ADDRESSABLE from nested functions to their
487 containing functions. */
488 for (link = decls; link; link = TREE_CHAIN (link))
490 if (TREE_CODE (link) == LABEL_DECL)
492 if (TREE_USED (link) && DECL_INITIAL (link) == 0)
494 error ("%Hlabel `%D' used but not defined",
495 &DECL_SOURCE_LOCATION (link), link);
496 /* Avoid crashing later. */
497 DECL_INITIAL (link) = error_mark_node;
499 else if (!TREE_USED (link) && warn_unused_label)
501 if (DECL_INITIAL (link) != 0)
502 warning ("%Hlabel `%D' defined but not used",
503 &DECL_SOURCE_LOCATION (link), link);
505 warning ("%Hlabel `%D' declared but not defined",
506 &DECL_SOURCE_LOCATION (link), link);
508 IDENTIFIER_LABEL_VALUE (DECL_NAME (link)) = 0;
510 else if (DECL_NAME (link) != 0)
512 if (DECL_EXTERNAL (link)
513 && current_scope != global_scope)
514 /* External decls stay in the symbol-value slot but are
516 C_DECL_INVISIBLE (link) = 1;
518 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (link)) = 0;
521 if (TREE_CODE (link) == FUNCTION_DECL
522 && ! TREE_ASM_WRITTEN (link)
523 && DECL_INITIAL (link) != 0
524 && TREE_ADDRESSABLE (link)
525 && DECL_ABSTRACT_ORIGIN (link) != 0
526 && DECL_ABSTRACT_ORIGIN (link) != link)
527 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (link)) = 1;
530 /* Clear out the tag-meanings declared in this scope. */
531 for (link = tags; link; link = TREE_CHAIN (link))
532 if (TREE_PURPOSE (link))
533 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (link)) = 0;
535 /* Restore all name- and label-meanings from outer scopes that were
536 shadowed by this scope. */
538 for (link = current_scope->shadowed; link; link = TREE_CHAIN (link))
539 if (TREE_VALUE (link) && TREE_CODE (TREE_VALUE (link)) == LABEL_DECL)
540 IDENTIFIER_LABEL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
542 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
544 /* Restore all tag-meanings from outer scopes that were shadowed by
547 for (link = current_scope->shadowed_tags; link;
548 link = TREE_CHAIN (link))
549 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
551 /* If this is the outermost block of a function, remove all
552 PARM_DECLs from current_scope->names; they are already
553 stored in DECL_ARGUMENTS of cfun->decl in proper order, should
554 not be put in BLOCK_VARS, and furthermore reversing them will
555 cause trouble later. They are all together at the end of the
557 if (functionbody && decls)
559 if (TREE_CODE (decls) == PARM_DECL)
564 while (TREE_CHAIN (link)
565 && TREE_CODE (TREE_CHAIN (link)) != PARM_DECL)
566 link = TREE_CHAIN (link);
568 TREE_CHAIN (link) = 0;
572 /* Get the decls in the order they were written.
573 Usually current_scope->names is in reverse order.
574 But parameter decls were previously put in forward order. */
577 decls = nreverse (decls);
579 /* If appropriate, create a BLOCK to record the decls for the life
585 block = make_node (BLOCK);
586 BLOCK_VARS (block) = decls;
587 BLOCK_SUBBLOCKS (block) = subblocks;
588 TREE_USED (block) = 1;
591 /* In each subblock, record that this is its superior. */
593 for (link = subblocks; link; link = TREE_CHAIN (link))
594 BLOCK_SUPERCONTEXT (link) = block;
596 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
597 binding contour so that they point to the appropriate construct, i.e.
598 either to the current FUNCTION_DECL node, or else to the BLOCK node
601 Note that for tagged types whose scope is just the formal parameter
602 list for some function type specification, we can't properly set
603 their TYPE_CONTEXTs here, because we don't have a pointer to the
604 appropriate FUNCTION_TYPE node readily available to us. For those
605 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
606 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
607 node which will represent the "scope" for these "parameter list local"
610 decl = functionbody ? current_function_decl : block;
612 for (link = tags; link; link = TREE_CHAIN (link))
613 TYPE_CONTEXT (TREE_VALUE (link)) = decl;
615 /* Pop the current scope, and free the structure for reuse. */
618 /* Dispose of the block that we just made inside some higher level. */
620 DECL_INITIAL (current_function_decl) = block;
621 else if (block && current_scope)
622 current_scope->blocks
623 = chainon (current_scope->blocks, block);
624 /* If we did not make a block for the scope just exited, any blocks
625 made for inner scopes (since they cannot be recorded as subblocks
626 here) must be carried forward so they will later become subblocks
627 of something else. */
628 else if (! block && subblocks)
629 current_scope->blocks
630 = chainon (current_scope->blocks, subblocks);
635 /* Insert BLOCK at the end of the list of subblocks of the current
636 scope. This is used when a BIND_EXPR is expanded, to handle the
637 BLOCK node inside the BIND_EXPR. */
640 insert_block (tree block)
642 TREE_USED (block) = 1;
643 current_scope->blocks
644 = chainon (current_scope->blocks, block);
647 /* Set the BLOCK node for the innermost scope (the one we are
648 currently in). The RTL expansion machinery requires us to provide
649 this hook, but it is not useful in function-at-a-time mode. */
652 set_block (tree block ATTRIBUTE_UNUSED)
656 /* Push a definition or a declaration of struct, union or enum tag "name".
657 "type" should be the type node.
658 We assume that the tag "name" is not already defined.
660 Note that the definition may really be just a forward reference.
661 In that case, the TYPE_SIZE will be zero. */
664 pushtag (tree name, tree type)
666 struct c_scope *b = current_scope;
670 /* Record the identifier as the type's name if it has none. */
672 if (TYPE_NAME (type) == 0)
673 TYPE_NAME (type) = name;
675 if (IDENTIFIER_TAG_VALUE (name))
676 b->shadowed_tags = tree_cons (name, IDENTIFIER_TAG_VALUE (name),
678 IDENTIFIER_TAG_VALUE (name) = type;
681 b->tags = tree_cons (name, type, b->tags);
683 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
684 tagged type we just added to the current scope. This fake
685 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
686 to output a representation of a tagged type, and it also gives
687 us a convenient place to record the "scope start" address for the
690 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
692 /* An approximation for now, so we can tell this is a function-scope tag.
693 This will be updated in poplevel. */
694 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
697 /* Subroutine of duplicate_decls. Allow harmless mismatches in return
698 and argument types provided that the type modes match. This function
699 return a unified type given a suitable match, and 0 otherwise. */
702 match_builtin_function_types (tree oldtype, tree newtype)
704 tree newrettype, oldrettype;
705 tree newargs, oldargs;
706 tree trytype, tryargs;
708 /* Accept the return type of the new declaration if same modes. */
709 oldrettype = TREE_TYPE (oldtype);
710 newrettype = TREE_TYPE (newtype);
712 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
715 oldargs = TYPE_ARG_TYPES (oldtype);
716 newargs = TYPE_ARG_TYPES (newtype);
719 while (oldargs || newargs)
723 || ! TREE_VALUE (oldargs)
724 || ! TREE_VALUE (newargs)
725 || TYPE_MODE (TREE_VALUE (oldargs))
726 != TYPE_MODE (TREE_VALUE (newargs)))
729 oldargs = TREE_CHAIN (oldargs);
730 newargs = TREE_CHAIN (newargs);
733 trytype = build_function_type (newrettype, tryargs);
734 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
737 /* Handle when a new declaration NEWDECL
738 has the same name as an old one OLDDECL
739 in the same binding contour.
740 Prints an error message if appropriate.
742 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
745 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
746 and OLDDECL is in an outer scope and should thus not be changed. */
749 duplicate_decls (tree newdecl, tree olddecl, int different_binding_level,
752 int comptype_flags = (different_tu ? COMPARE_DIFFERENT_TU
754 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl),
756 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
757 && DECL_INITIAL (newdecl) != 0);
758 tree oldtype = TREE_TYPE (olddecl);
759 tree newtype = TREE_TYPE (newdecl);
762 if (DECL_P (olddecl))
764 if (TREE_CODE (newdecl) == FUNCTION_DECL
765 && TREE_CODE (olddecl) == FUNCTION_DECL
766 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
768 if (DECL_DECLARED_INLINE_P (newdecl)
769 && DECL_UNINLINABLE (newdecl)
770 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
771 /* Already warned elsewhere. */;
772 else if (DECL_DECLARED_INLINE_P (olddecl)
773 && DECL_UNINLINABLE (olddecl)
774 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
775 /* Already warned. */;
776 else if (DECL_DECLARED_INLINE_P (newdecl)
777 && ! DECL_DECLARED_INLINE_P (olddecl)
778 && DECL_UNINLINABLE (olddecl)
779 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
781 warning ("%Hfunction '%D' redeclared as inline",
782 &DECL_SOURCE_LOCATION (newdecl), newdecl);
783 warning ("%Hprevious declaration of function '%D' "
784 "with attribute noinline",
785 &DECL_SOURCE_LOCATION (olddecl), olddecl);
787 else if (DECL_DECLARED_INLINE_P (olddecl)
788 && DECL_UNINLINABLE (newdecl)
789 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
791 warning ("%Hfunction '%D' redeclared with attribute noinline",
792 &DECL_SOURCE_LOCATION (newdecl), newdecl);
793 warning ("%Hprevious declaration of function '%D' was inline",
794 &DECL_SOURCE_LOCATION (olddecl), olddecl);
798 DECL_ATTRIBUTES (newdecl)
799 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
802 if (TREE_CODE (newtype) == ERROR_MARK
803 || TREE_CODE (oldtype) == ERROR_MARK)
806 /* New decl is completely inconsistent with the old one =>
807 tell caller to replace the old one.
808 This is always an error except in the case of shadowing a builtin. */
809 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
811 if (TREE_CODE (olddecl) == FUNCTION_DECL
812 && DECL_BUILT_IN (olddecl))
814 /* If you declare a built-in or predefined function name as static,
815 the old definition is overridden,
816 but optionally warn this was a bad choice of name. */
817 if (!TREE_PUBLIC (newdecl))
820 warning ("%Hshadowing built-in function '%D'",
821 &DECL_SOURCE_LOCATION (newdecl), newdecl);
824 warning ("%Hbuilt-in function '%D' declared as non-function",
825 &DECL_SOURCE_LOCATION (newdecl), newdecl);
829 error ("%H'%D' redeclared as different kind of symbol",
830 &DECL_SOURCE_LOCATION (newdecl), newdecl);
831 error ("%Hprevious declaration of '%D'",
832 &DECL_SOURCE_LOCATION (olddecl), olddecl);
838 /* For real parm decl following a forward decl, return 1 so old decl
839 will be reused. Only allow this to happen once. */
840 if (types_match && TREE_CODE (newdecl) == PARM_DECL
841 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
843 TREE_ASM_WRITTEN (olddecl) = 0;
847 /* The new declaration is the same kind of object as the old one.
848 The declarations may partially match. Print warnings if they don't
849 match enough. Ultimately, copy most of the information from the new
850 decl to the old one, and keep using the old one. */
852 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
854 /* A function declaration for a built-in function. */
855 if (!TREE_PUBLIC (newdecl))
857 /* If you declare a built-in function name as static, the
858 built-in definition is overridden,
859 but optionally warn this was a bad choice of name. */
861 warning ("%Hshadowing built-in function '%D'",
862 &DECL_SOURCE_LOCATION (newdecl), newdecl);
863 /* Discard the old built-in function. */
868 /* Accept harmless mismatch in function types.
869 This is for the ffs and fprintf builtins. */
870 tree trytype = match_builtin_function_types (oldtype, newtype);
874 types_match = comptypes (newtype, trytype, comptype_flags);
877 if (! different_binding_level)
878 TREE_TYPE (olddecl) = oldtype;
883 /* If types don't match for a built-in, throw away the built-in. */
884 warning ("%Hconflicting types for built-in function '%D'",
885 &DECL_SOURCE_LOCATION (newdecl), newdecl);
889 else if (TREE_CODE (olddecl) == FUNCTION_DECL
890 && DECL_SOURCE_LINE (olddecl) == 0)
892 /* A function declaration for a predeclared function
893 that isn't actually built in. */
894 if (!TREE_PUBLIC (newdecl))
896 /* If you declare it as static, the
897 default definition is overridden. */
900 else if (!types_match)
902 /* If the types don't match, preserve volatility indication.
903 Later on, we will discard everything else about the
904 default declaration. */
905 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
908 /* Permit char *foo () to match void *foo (...) if not pedantic,
909 if one of them came from a system header file. */
910 else if (!types_match
911 && TREE_CODE (olddecl) == FUNCTION_DECL
912 && TREE_CODE (newdecl) == FUNCTION_DECL
913 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
914 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
915 && (DECL_IN_SYSTEM_HEADER (olddecl)
916 || DECL_IN_SYSTEM_HEADER (newdecl))
917 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
918 && TYPE_ARG_TYPES (oldtype) == 0
919 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
920 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
922 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
923 && TYPE_ARG_TYPES (newtype) == 0
924 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
925 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
928 pedwarn ("%Hconflicting types for '%D'",
929 &DECL_SOURCE_LOCATION (newdecl), newdecl);
930 /* Make sure we keep void * as ret type, not char *. */
931 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
932 TREE_TYPE (newdecl) = newtype = oldtype;
934 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
935 we will come back here again. */
936 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
938 /* Permit void foo (...) to match int foo (...) if the latter is the
939 definition and implicit int was used. See c-torture/compile/920625-2.c. */
940 else if (!types_match && new_is_definition
941 && TREE_CODE (olddecl) == FUNCTION_DECL
942 && TREE_CODE (newdecl) == FUNCTION_DECL
943 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
944 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
945 && C_FUNCTION_IMPLICIT_INT (newdecl))
947 pedwarn ("%Hconflicting types for '%D'",
948 &DECL_SOURCE_LOCATION (newdecl), newdecl);
949 /* Make sure we keep void as the return type. */
950 TREE_TYPE (newdecl) = newtype = oldtype;
951 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
953 else if (!types_match
954 /* Permit char *foo (int, ...); followed by char *foo ();
956 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
958 /* Return types must still match. */
959 && comptypes (TREE_TYPE (oldtype),
960 TREE_TYPE (newtype), comptype_flags)
961 && TYPE_ARG_TYPES (newtype) == 0))
963 error ("%Hconflicting types for '%D'",
964 &DECL_SOURCE_LOCATION (newdecl), newdecl);
965 /* Check for function type mismatch
966 involving an empty arglist vs a nonempty one. */
967 if (TREE_CODE (olddecl) == FUNCTION_DECL
968 && comptypes (TREE_TYPE (oldtype),
969 TREE_TYPE (newtype), comptype_flags)
970 && ((TYPE_ARG_TYPES (oldtype) == 0
971 && DECL_INITIAL (olddecl) == 0)
973 (TYPE_ARG_TYPES (newtype) == 0
974 && DECL_INITIAL (newdecl) == 0)))
976 /* Classify the problem further. */
977 tree t = TYPE_ARG_TYPES (oldtype);
979 t = TYPE_ARG_TYPES (newtype);
980 for (; t; t = TREE_CHAIN (t))
982 tree type = TREE_VALUE (t);
984 if (TREE_CHAIN (t) == 0
985 && TYPE_MAIN_VARIANT (type) != void_type_node)
987 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
991 if (c_type_promotes_to (type) != type)
993 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
998 if (C_DECL_IMPLICIT (olddecl))
999 error ("%Hprevious implicit declaration of '%D'",
1000 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1002 error ("%Hprevious declaration of '%D'",
1003 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1005 /* This is safer because the initializer might contain references
1006 to variables that were declared between olddecl and newdecl. This
1007 will make the initializer invalid for olddecl in case it gets
1008 assigned to olddecl below. */
1009 if (TREE_CODE (newdecl) == VAR_DECL)
1010 DECL_INITIAL (newdecl) = 0;
1012 /* TLS cannot follow non-TLS declaration. */
1013 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1014 && !DECL_THREAD_LOCAL (olddecl) && DECL_THREAD_LOCAL (newdecl))
1016 error ("%Hthread-local declaration of '%D' follows non thread-local "
1017 "declaration", &DECL_SOURCE_LOCATION (newdecl), newdecl);
1018 error ("%Hprevious declaration of '%D'",
1019 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1021 /* non-TLS declaration cannot follow TLS declaration. */
1022 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1023 && DECL_THREAD_LOCAL (olddecl) && !DECL_THREAD_LOCAL (newdecl))
1025 error ("%Hnon thread-local declaration of '%D' follows "
1026 "thread-local declaration",
1027 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1028 error ("%Hprevious declaration of '%D'",
1029 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1033 errmsg = redeclaration_error_message (newdecl, olddecl);
1036 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1040 error ("%Hredefinition of '%D'", locus, newdecl);
1043 error ("%Hredeclaration of '%D'", locus, newdecl);
1046 error ("%Hconflicting declarations of '%D'", locus, newdecl);
1052 locus = &DECL_SOURCE_LOCATION (olddecl);
1053 if (DECL_INITIAL (olddecl)
1054 && current_scope == global_scope)
1055 error ("%H'%D' previously defined here", locus, olddecl);
1057 error ("%H'%D' previously declared here", locus, olddecl);
1060 else if (TREE_CODE (newdecl) == TYPE_DECL
1061 && (DECL_IN_SYSTEM_HEADER (olddecl)
1062 || DECL_IN_SYSTEM_HEADER (newdecl)))
1064 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1065 warning ("%Hredefinition of '%D'", locus, newdecl);
1066 locus = &DECL_SOURCE_LOCATION (olddecl);
1067 if (DECL_INITIAL (olddecl)
1068 && current_scope == global_scope)
1069 warning ("%H'%D' previously defined here", locus, olddecl);
1071 warning ("%H'%D' previously declared here", locus, olddecl);
1073 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1074 && DECL_INITIAL (olddecl) != 0
1075 && TYPE_ARG_TYPES (oldtype) == 0
1076 && TYPE_ARG_TYPES (newtype) != 0
1077 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1081 /* Prototype decl follows defn w/o prototype. */
1083 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1084 type = TYPE_ARG_TYPES (newtype),
1087 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1089 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1090 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1092 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1093 warning ("%Hprototype for '%D' follows", locus, newdecl);
1094 locus = &DECL_SOURCE_LOCATION (olddecl);
1095 warning ("%Hnon-prototype definition here", locus);
1098 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1099 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1101 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1102 error ("%Hprototype for '%D' follows and number of "
1103 "arguments doesn't match", locus, newdecl);
1104 locus = &DECL_SOURCE_LOCATION (olddecl);
1105 error ("%Hnon-prototype definition here", locus);
1109 /* Type for passing arg must be consistent
1110 with that declared for the arg. */
1111 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type),
1114 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1115 error ("%Hprototype for '%D' follows and argument %d "
1116 "doesn't match", locus, newdecl, nargs);
1117 locus = &DECL_SOURCE_LOCATION (olddecl);
1118 error ("%Hnon-prototype definition here", locus);
1124 /* Warn about mismatches in various flags. */
1127 /* Warn if function is now inline
1128 but was previously declared not inline and has been called. */
1129 if (TREE_CODE (olddecl) == FUNCTION_DECL
1130 && ! DECL_DECLARED_INLINE_P (olddecl)
1131 && DECL_DECLARED_INLINE_P (newdecl)
1132 && TREE_USED (olddecl))
1133 warning ("%H'%D' declared inline after being called",
1134 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1135 if (TREE_CODE (olddecl) == FUNCTION_DECL
1136 && ! DECL_DECLARED_INLINE_P (olddecl)
1137 && DECL_DECLARED_INLINE_P (newdecl)
1138 && DECL_INITIAL (olddecl) != 0)
1139 warning ("%H'%D' declared inline after its definition",
1140 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1142 /* If pedantic, warn when static declaration follows a non-static
1143 declaration. Otherwise, do so only for functions. */
1144 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1145 && TREE_PUBLIC (olddecl)
1146 && !TREE_PUBLIC (newdecl))
1147 warning ("%Hstatic declaration for '%D' follows non-static",
1148 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1150 /* If warn_traditional, warn when a non-static function
1151 declaration follows a static one. */
1152 if (warn_traditional && !in_system_header
1153 && TREE_CODE (olddecl) == FUNCTION_DECL
1154 && !TREE_PUBLIC (olddecl)
1155 && TREE_PUBLIC (newdecl))
1156 warning ("%Hnon-static declaration for '%D' follows static",
1157 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1159 /* Warn when const declaration follows a non-const
1160 declaration, but not for functions. */
1161 if (TREE_CODE (olddecl) != FUNCTION_DECL
1162 && !TREE_READONLY (olddecl)
1163 && TREE_READONLY (newdecl))
1164 warning ("%Hconst declaration for '%D' follows non-const",
1165 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1166 /* These bits are logically part of the type, for variables.
1167 But not for functions
1168 (where qualifiers are not valid ANSI anyway). */
1169 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1170 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1171 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1172 pedwarn ("%Htype qualifiers for '%D' conflict with previous "
1173 "declaration", &DECL_SOURCE_LOCATION (newdecl), newdecl);
1177 /* Optionally warn about more than one declaration for the same name. */
1178 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1179 /* Don't warn about a function declaration
1180 followed by a definition. */
1181 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1182 && DECL_INITIAL (olddecl) == 0)
1183 /* Don't warn about extern decl followed by (tentative) definition. */
1184 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1186 warning ("%Hredundant redeclaration of '%D' in same scope",
1187 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1188 warning ("%Hprevious declaration of '%D'",
1189 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1192 /* Copy all the DECL_... slots specified in the new decl
1193 except for any that we copy here from the old type.
1195 Past this point, we don't change OLDTYPE and NEWTYPE
1196 even if we change the types of NEWDECL and OLDDECL. */
1200 /* When copying info to olddecl, we store into write_olddecl
1201 instead. This allows us to avoid modifying olddecl when
1202 different_binding_level is true. */
1203 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1205 /* Merge the data types specified in the two decls. */
1206 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1208 if (different_binding_level)
1210 if (TYPE_ARG_TYPES (oldtype) != 0
1211 && TYPE_ARG_TYPES (newtype) == 0)
1212 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1215 = build_type_attribute_variant
1217 merge_attributes (TYPE_ATTRIBUTES (newtype),
1218 TYPE_ATTRIBUTES (oldtype)));
1222 = TREE_TYPE (olddecl)
1223 = common_type (newtype, oldtype);
1226 /* Lay the type out, unless already done. */
1227 if (oldtype != TREE_TYPE (newdecl))
1229 if (TREE_TYPE (newdecl) != error_mark_node)
1230 layout_type (TREE_TYPE (newdecl));
1231 if (TREE_CODE (newdecl) != FUNCTION_DECL
1232 && TREE_CODE (newdecl) != TYPE_DECL
1233 && TREE_CODE (newdecl) != CONST_DECL)
1234 layout_decl (newdecl, 0);
1238 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1239 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1240 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1241 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1242 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1243 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1245 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1246 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1250 /* Keep the old rtl since we can safely use it. */
1251 COPY_DECL_RTL (olddecl, newdecl);
1253 /* Merge the type qualifiers. */
1254 if (TREE_READONLY (newdecl))
1255 TREE_READONLY (write_olddecl) = 1;
1257 if (TREE_THIS_VOLATILE (newdecl))
1259 TREE_THIS_VOLATILE (write_olddecl) = 1;
1260 if (TREE_CODE (newdecl) == VAR_DECL
1261 /* If an automatic variable is re-declared in the same
1262 function scope, but the old declaration was not
1263 volatile, make_var_volatile() would crash because the
1264 variable would have been assigned to a pseudo, not a
1265 MEM. Since this duplicate declaration is invalid
1266 anyway, we just skip the call. */
1268 make_var_volatile (newdecl);
1271 /* Keep source location of definition rather than declaration. */
1272 /* When called with different_binding_level set, keep the old
1273 information so that meaningful diagnostics can be given. */
1274 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1275 && ! different_binding_level)
1277 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1278 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1281 /* Merge the unused-warning information. */
1282 if (DECL_IN_SYSTEM_HEADER (olddecl))
1283 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1284 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1285 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1287 /* Merge the initialization information. */
1288 /* When called with different_binding_level set, don't copy over
1289 DECL_INITIAL, so that we don't accidentally change function
1290 declarations into function definitions. */
1291 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1292 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1294 /* Merge the section attribute.
1295 We want to issue an error if the sections conflict but that must be
1296 done later in decl_attributes since we are called before attributes
1298 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1299 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1301 /* Copy the assembler name.
1302 Currently, it can only be defined in the prototype. */
1303 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1305 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1307 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1308 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1309 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1310 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1311 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1312 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1313 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1314 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1315 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1318 /* If cannot merge, then use the new type and qualifiers,
1319 and don't preserve the old rtl. */
1320 else if (! different_binding_level)
1322 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1323 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1324 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1325 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1328 /* Merge the storage class information. */
1329 merge_weak (newdecl, olddecl);
1331 /* For functions, static overrides non-static. */
1332 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1334 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1335 /* This is since we don't automatically
1336 copy the attributes of NEWDECL into OLDDECL. */
1337 /* No need to worry about different_binding_level here because
1338 then TREE_PUBLIC (newdecl) was true. */
1339 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1340 /* If this clears `static', clear it in the identifier too. */
1341 if (! TREE_PUBLIC (olddecl))
1342 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1344 if (DECL_EXTERNAL (newdecl))
1346 if (! different_binding_level || different_tu)
1348 /* Don't mess with these flags on local externs; they remain
1349 external even if there's a declaration at file scope which
1351 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1352 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1354 /* An extern decl does not override previous storage class. */
1355 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1356 if (! DECL_EXTERNAL (newdecl))
1358 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1359 /* If we have two non-EXTERNAL file-scope decls that are
1360 the same, only one of them should be written out. */
1362 TREE_ASM_WRITTEN (newdecl) = 1;
1367 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1368 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1371 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1373 /* If we're redefining a function previously defined as extern
1374 inline, make sure we emit debug info for the inline before we
1375 throw it away, in case it was inlined into a function that hasn't
1376 been written out yet. */
1377 if (new_is_definition && DECL_INITIAL (olddecl))
1379 if (TREE_USED (olddecl))
1380 (*debug_hooks->outlining_inline_function) (olddecl);
1382 /* The new defn must not be inline. */
1383 DECL_INLINE (newdecl) = 0;
1384 DECL_UNINLINABLE (newdecl) = 1;
1388 /* If either decl says `inline', this fn is inline,
1389 unless its definition was passed already. */
1390 if (DECL_DECLARED_INLINE_P (newdecl)
1391 || DECL_DECLARED_INLINE_P (olddecl))
1392 DECL_DECLARED_INLINE_P (newdecl) = 1;
1394 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1395 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1398 if (DECL_BUILT_IN (olddecl))
1400 /* Get rid of any built-in function if new arg types don't match it
1401 or if we have a function definition. */
1402 if (! types_match || new_is_definition)
1404 if (! different_binding_level)
1406 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1407 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1412 /* If redeclaring a builtin function, and not a definition,
1413 it stays built in. */
1414 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1415 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1419 /* Also preserve various other info from the definition. */
1420 if (! new_is_definition)
1422 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1423 /* When called with different_binding_level set, don't copy over
1424 DECL_INITIAL, so that we don't accidentally change function
1425 declarations into function definitions. */
1426 if (! different_binding_level)
1427 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1428 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1429 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1430 DECL_ESTIMATED_INSNS (newdecl) = DECL_ESTIMATED_INSNS (olddecl);
1431 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1433 /* Set DECL_INLINE on the declaration if we've got a body
1434 from which to instantiate. */
1435 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1437 DECL_INLINE (newdecl) = 1;
1438 DECL_ABSTRACT_ORIGIN (newdecl)
1439 = (different_binding_level
1440 ? DECL_ORIGIN (olddecl)
1441 : DECL_ABSTRACT_ORIGIN (olddecl));
1446 /* If a previous declaration said inline, mark the
1447 definition as inlinable. */
1448 if (DECL_DECLARED_INLINE_P (newdecl)
1449 && ! DECL_UNINLINABLE (newdecl))
1450 DECL_INLINE (newdecl) = 1;
1453 if (different_binding_level)
1456 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1457 But preserve OLDDECL's DECL_UID. */
1459 unsigned olddecl_uid = DECL_UID (olddecl);
1461 memcpy ((char *) olddecl + sizeof (struct tree_common),
1462 (char *) newdecl + sizeof (struct tree_common),
1463 sizeof (struct tree_decl) - sizeof (struct tree_common));
1464 DECL_UID (olddecl) = olddecl_uid;
1467 /* NEWDECL contains the merged attribute lists.
1468 Update OLDDECL to be the same. */
1469 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1471 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1472 so that encode_section_info has a chance to look at the new decl
1473 flags and attributes. */
1474 if (DECL_RTL_SET_P (olddecl)
1475 && (TREE_CODE (olddecl) == FUNCTION_DECL
1476 || (TREE_CODE (olddecl) == VAR_DECL
1477 && TREE_STATIC (olddecl))))
1478 make_decl_rtl (olddecl, NULL);
1483 /* Return any external DECL associated with ID, whether or not it is
1484 currently in scope. */
1487 any_external_decl (tree id)
1489 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1492 if (decl == 0 || TREE_CODE (decl) == ERROR_MARK)
1494 else if (TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1497 t = purpose_member (id, truly_local_externals);
1499 return TREE_VALUE (t);
1504 /* Record an external decl DECL. This only does something if a
1505 shadowing decl already exists. */
1507 record_external_decl (tree decl)
1509 tree name = DECL_NAME (decl);
1510 if (!IDENTIFIER_SYMBOL_VALUE (name))
1513 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1516 /* Check whether decl-node X shadows an existing declaration.
1517 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1518 which might be a NULL_TREE. */
1520 warn_if_shadowing (tree x, tree old)
1524 /* Nothing to shadow? */
1526 /* Shadow warnings not wanted? */
1528 /* No shadow warnings for internally generated vars. */
1529 || DECL_SOURCE_LINE (x) == 0
1530 /* No shadow warnings for vars made for inlining. */
1531 || DECL_FROM_INLINE (x)
1532 /* Don't warn about the parm names in function declarator
1533 within a function declarator.
1534 It would be nice to avoid warning in any function
1535 declarator in a declaration, as opposed to a definition,
1536 but there is no way to tell it's not a definition. */
1537 || (TREE_CODE (x) == PARM_DECL
1538 && current_scope->outer->parm_flag))
1541 name = IDENTIFIER_POINTER (DECL_NAME (x));
1543 if (TREE_CODE (old) == PARM_DECL)
1544 shadow_warning (SW_PARAM, name, old);
1545 else if (C_DECL_FILE_SCOPE (old))
1546 shadow_warning (SW_GLOBAL, name, old);
1548 shadow_warning (SW_LOCAL, name, old);
1552 /* Subroutine of pushdecl.
1554 X is a TYPE_DECL for a typedef statement. Create a brand new
1555 ..._TYPE node (which will be just a variant of the existing
1556 ..._TYPE node with identical properties) and then install X
1557 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1559 The whole point here is to end up with a situation where each
1560 and every ..._TYPE node the compiler creates will be uniquely
1561 associated with AT MOST one node representing a typedef name.
1562 This way, even though the compiler substitutes corresponding
1563 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1564 early on, later parts of the compiler can always do the reverse
1565 translation and get back the corresponding typedef name. For
1568 typedef struct S MY_TYPE;
1571 Later parts of the compiler might only know that `object' was of
1572 type `struct S' if it were not for code just below. With this
1573 code however, later parts of the compiler see something like:
1575 struct S' == struct S
1576 typedef struct S' MY_TYPE;
1579 And they can then deduce (from the node for type struct S') that
1580 the original object declaration was:
1584 Being able to do this is important for proper support of protoize,
1585 and also for generating precise symbolic debugging information
1586 which takes full account of the programmer's (typedef) vocabulary.
1588 Obviously, we don't want to generate a duplicate ..._TYPE node if
1589 the TYPE_DECL node that we are now processing really represents a
1590 standard built-in type.
1592 Since all standard types are effectively declared at line zero
1593 in the source file, we can easily check to see if we are working
1594 on a standard type by checking the current value of lineno. */
1597 clone_underlying_type (tree x)
1599 if (DECL_SOURCE_LINE (x) == 0)
1601 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1602 TYPE_NAME (TREE_TYPE (x)) = x;
1604 else if (TREE_TYPE (x) != error_mark_node
1605 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1607 tree tt = TREE_TYPE (x);
1608 DECL_ORIGINAL_TYPE (x) = tt;
1609 tt = build_type_copy (tt);
1611 TREE_USED (tt) = TREE_USED (x);
1616 /* Record a decl-node X as belonging to the current lexical scope.
1617 Check for errors (such as an incompatible declaration for the same
1618 name already seen in the same scope).
1620 Returns either X or an old decl for the same name.
1621 If an old decl is returned, it may have been smashed
1622 to agree with what X says. */
1627 tree name = DECL_NAME (x);
1628 struct c_scope *scope = current_scope;
1630 #ifdef ENABLE_CHECKING
1631 if (error_mark_node == 0)
1632 /* Called too early. */
1636 /* Functions need the lang_decl data. */
1637 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1638 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1640 /* A local extern declaration for a function doesn't constitute nesting.
1641 A local auto declaration does, since it's a forward decl
1642 for a nested function coming later. */
1643 if (current_function_decl == NULL
1644 || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1645 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
1646 DECL_CONTEXT (x) = current_file_decl;
1648 DECL_CONTEXT (x) = current_function_decl;
1654 if (warn_nested_externs
1655 && scope != global_scope
1656 && DECL_EXTERNAL (x)
1657 && !DECL_IN_SYSTEM_HEADER (x))
1658 warning ("nested extern declaration of `%s'",
1659 IDENTIFIER_POINTER (name));
1661 old = lookup_name_current_level (name);
1662 if (old && duplicate_decls (x, old, 0, false))
1664 if (DECL_EXTERNAL (x) || scope == global_scope)
1666 /* Find and check against a previous, not-in-scope, external
1667 decl for this identifier. (C99 s???: If two declarations
1668 with external linkage, referring to the same object, have
1669 incompatible types, the behavior is undefined). */
1670 tree ext = any_external_decl (name);
1673 if (duplicate_decls (x, ext, scope != global_scope,
1675 x = copy_node (ext);
1678 record_external_decl (x);
1681 if (TREE_CODE (x) == TYPE_DECL)
1682 clone_underlying_type (x);
1684 /* If storing a local value, there may already be one
1685 (inherited). If so, record it for restoration when this
1686 scope ends. Take care not to do this if we are replacing an
1687 older decl in the same scope (i.e. duplicate_decls returned
1689 if (scope != global_scope
1690 && IDENTIFIER_SYMBOL_VALUE (name)
1691 && IDENTIFIER_SYMBOL_VALUE (name) != old)
1693 warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
1694 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1698 /* Install the new declaration in the requested scope. */
1699 IDENTIFIER_SYMBOL_VALUE (name) = x;
1700 C_DECL_INVISIBLE (x) = 0;
1702 /* Keep list of variables in this scope with incomplete type.
1703 If the input is erroneous, we can have error_mark in the type
1704 slot (e.g. "f(void a, ...)") - that doesn't count as an
1706 if (TREE_TYPE (x) != error_mark_node
1707 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1709 tree element = TREE_TYPE (x);
1711 while (TREE_CODE (element) == ARRAY_TYPE)
1712 element = TREE_TYPE (element);
1713 if (TREE_CODE (element) == RECORD_TYPE
1714 || TREE_CODE (element) == UNION_TYPE)
1715 scope->incomplete_list = tree_cons (NULL_TREE, x,
1716 scope->incomplete_list);
1720 /* Put decls on list in reverse order.
1721 We will reverse them later if necessary. */
1722 TREE_CHAIN (x) = scope->names;
1728 /* Record X as belonging to the global scope (C99 "file scope").
1729 This is used only internally by the Objective-C front end,
1730 and is limited to its needs. It will hork if there is _any_
1731 visible binding for X (not just a global one). */
1733 pushdecl_top_level (tree x)
1737 if (TREE_CODE (x) != VAR_DECL)
1740 name = DECL_NAME (x);
1741 old = IDENTIFIER_SYMBOL_VALUE (name);
1745 if (DECL_CONTEXT (old))
1748 if (!duplicate_decls (x, old, 0, false))
1754 DECL_CONTEXT (x) = current_file_decl;
1755 IDENTIFIER_SYMBOL_VALUE (name) = x;
1756 TREE_CHAIN (x) = global_scope->names;
1757 global_scope->names = x;
1761 /* Record X as belonging to the outermost scope of the current
1762 function. This is used only internally, by c_make_fname_decl and
1763 undeclared_variable, and is limited to their needs. The NAME is
1764 provided as a separate argument because undeclared_variable wants to
1765 use error_mark_node for X. For VAR_DECLs, duplicate_decls is not
1766 called; if there is any preexisting decl for this identifier, it is
1769 pushdecl_function_level (tree x, tree name)
1771 struct c_scope *scope = current_function_scope;
1773 if (x == error_mark_node)
1774 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1776 else if (TREE_CODE (x) == VAR_DECL)
1778 if (name != DECL_NAME (x))
1780 if (IDENTIFIER_SYMBOL_VALUE (name))
1783 DECL_CONTEXT (x) = current_function_decl;
1784 TREE_CHAIN (x) = scope->names;
1788 IDENTIFIER_SYMBOL_VALUE (name) = x;
1791 /* Generate an implicit declaration for identifier FUNCTIONID as a
1792 function of type int (). */
1795 implicitly_declare (tree functionid)
1797 tree decl = any_external_decl (functionid);
1799 if (decl && decl != error_mark_node)
1801 /* Implicit declaration of a function already declared
1802 (somehow) in a different scope, or as a built-in.
1803 If this is the first time this has happened, warn;
1804 then recycle the old declaration. */
1805 if (!C_DECL_IMPLICIT (decl))
1807 implicit_decl_warning (DECL_NAME (decl));
1808 if (! C_DECL_FILE_SCOPE (decl))
1809 warning ("%Hprevious declaration of '%D'",
1810 &DECL_SOURCE_LOCATION (decl), decl);
1811 C_DECL_IMPLICIT (decl) = 1;
1813 /* If this function is global, then it must already be in the
1814 global scope, so there's no need to push it again. */
1815 if (current_scope == global_scope)
1817 /* If this is a local declaration, make a copy; we can't have
1818 the same DECL listed in two different scopes. */
1819 return pushdecl (copy_node (decl));
1822 /* Not seen before. */
1823 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1824 DECL_EXTERNAL (decl) = 1;
1825 TREE_PUBLIC (decl) = 1;
1826 C_DECL_IMPLICIT (decl) = 1;
1827 implicit_decl_warning (functionid);
1829 /* ANSI standard says implicit declarations are in the innermost block.
1830 So we record the decl in the standard fashion. */
1831 decl = pushdecl (decl);
1833 /* No need to call objc_check_decl here - it's a function type. */
1834 rest_of_decl_compilation (decl, NULL, 0, 0);
1836 /* Write a record describing this implicit function declaration to the
1837 prototypes file (if requested). */
1839 gen_aux_info_record (decl, 0, 1, 0);
1841 /* Possibly apply some default attributes to this implicit declaration. */
1842 decl_attributes (&decl, NULL_TREE, 0);
1848 implicit_decl_warning (tree id)
1850 const char *name = IDENTIFIER_POINTER (id);
1851 if (mesg_implicit_function_declaration == 2)
1852 error ("implicit declaration of function `%s'", name);
1853 else if (mesg_implicit_function_declaration == 1)
1854 warning ("implicit declaration of function `%s'", name);
1857 /* Return zero if the declaration NEWDECL is valid
1858 when the declaration OLDDECL (assumed to be for the same name)
1859 has already been seen.
1860 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
1861 and 3 if it is a conflicting declaration. */
1864 redeclaration_error_message (tree newdecl, tree olddecl)
1866 if (TREE_CODE (newdecl) == TYPE_DECL)
1868 /* Do not complain about type redeclarations where at least one
1869 declaration was in a system header. */
1870 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
1874 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1876 /* Declarations of functions can insist on internal linkage
1877 but they can't be inconsistent with internal linkage,
1878 so there can be no error on that account.
1879 However defining the same name twice is no good. */
1880 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
1881 /* However, defining once as extern inline and a second
1882 time in another way is ok. */
1883 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
1884 && ! (DECL_DECLARED_INLINE_P (newdecl)
1885 && DECL_EXTERNAL (newdecl))))
1889 else if (C_DECL_FILE_SCOPE (newdecl))
1891 /* Objects declared at file scope: */
1892 /* If at least one is a reference, it's ok. */
1893 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
1895 /* Reject two definitions. */
1896 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
1898 /* Now we have two tentative defs, or one tentative and one real def. */
1899 /* Insist that the linkage match. */
1900 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
1904 else if (current_scope->parm_flag
1905 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1909 /* Newdecl has block scope. If olddecl has block scope also, then
1910 reject two definitions, and reject a definition together with an
1911 external reference. Otherwise, it is OK, because newdecl must
1912 be an extern reference to olddecl. */
1913 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
1914 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
1920 /* Issue an error message for a reference to an undeclared variable
1921 ID, including a reference to a builtin outside of function-call
1922 context. Establish a binding of the identifier to error_mark_node
1923 in an appropriate scope, which will suppress further errors for the
1926 undeclared_variable (tree id)
1928 static bool already = false;
1930 if (current_function_decl == 0)
1932 error ("`%s' undeclared here (not in a function)",
1933 IDENTIFIER_POINTER (id));
1934 IDENTIFIER_SYMBOL_VALUE (id) = error_mark_node;
1938 error ("`%s' undeclared (first use in this function)",
1939 IDENTIFIER_POINTER (id));
1943 error ("(Each undeclared identifier is reported only once");
1944 error ("for each function it appears in.)");
1948 pushdecl_function_level (error_mark_node, id);
1952 /* Subroutine of lookup_label, declare_label, define_label: construct a
1953 LABEL_DECL with all the proper frills. */
1956 make_label (tree name, location_t location)
1958 tree label = build_decl (LABEL_DECL, name, void_type_node);
1960 DECL_CONTEXT (label) = current_function_decl;
1961 DECL_MODE (label) = VOIDmode;
1962 DECL_SOURCE_LOCATION (label) = location;
1967 /* Another subroutine of lookup_label, declare_label, define_label:
1968 set up the binding of name to LABEL_DECL in the given SCOPE. */
1971 bind_label (tree name, tree label, struct c_scope *scope)
1973 if (IDENTIFIER_LABEL_VALUE (name))
1974 scope->shadowed = tree_cons (name, IDENTIFIER_LABEL_VALUE (name),
1976 IDENTIFIER_LABEL_VALUE (name) = label;
1978 TREE_CHAIN (label) = scope->names;
1979 scope->names = label;
1982 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
1983 Create one if none exists so far for the current function.
1984 This is called when a label is used in a goto expression or
1985 has its address taken. */
1988 lookup_label (tree name)
1992 if (current_function_decl == 0)
1994 error ("label %s referenced outside of any function",
1995 IDENTIFIER_POINTER (name));
1999 /* Use a label already defined or ref'd with this name, but not if
2000 it is inherited from a containing function and wasn't declared
2002 label = IDENTIFIER_LABEL_VALUE (name);
2003 if (label && (DECL_CONTEXT (label) == current_function_decl
2004 || C_DECLARED_LABEL_FLAG (label)))
2006 /* If the label has only been declared, update its apparent
2007 location to point here, for better diagnostics if it
2008 turns out not to have been defined. */
2009 if (!TREE_USED (label))
2010 DECL_SOURCE_LOCATION (label) = input_location;
2014 /* No label binding for that identifier; make one. */
2015 label = make_label (name, input_location);
2017 /* Ordinary labels go in the current function scope, which is
2018 not necessarily the current label scope. */
2019 bind_label (name, label, current_function_scope);
2023 /* Make a label named NAME in the current function, shadowing silently
2024 any that may be inherited from containing functions or containing
2025 scopes. This is called for __label__ declarations. */
2027 /* Note that valid use, if the label being shadowed comes from another
2028 scope in the same function, requires calling declare_nonlocal_label
2029 right away. (Is this still true? -zw 2003-07-17) */
2032 declare_label (tree name)
2034 tree label = IDENTIFIER_LABEL_VALUE (name);
2037 /* Check to make sure that the label hasn't already been declared
2039 for (dup = current_scope->names; dup; dup = TREE_CHAIN (dup))
2042 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2043 error ("%Hthis is a previous declaration",
2044 &DECL_SOURCE_LOCATION (dup));
2046 /* Just use the previous declaration. */
2050 label = make_label (name, input_location);
2051 C_DECLARED_LABEL_FLAG (label) = 1;
2053 /* Declared labels go in the current scope. */
2054 bind_label (name, label, current_scope);
2058 /* Define a label, specifying the location in the source file.
2059 Return the LABEL_DECL node for the label, if the definition is valid.
2060 Otherwise return 0. */
2063 define_label (location_t location, tree name)
2067 /* Find any preexisting label with this name. It is an error
2068 if that label has already been defined in this function, or
2069 if there is a containing function with a declared label with
2071 label = IDENTIFIER_LABEL_VALUE (name);
2074 && ((DECL_CONTEXT (label) == current_function_decl
2075 && DECL_INITIAL (label) != 0)
2076 || (DECL_CONTEXT (label) != current_function_decl
2077 && C_DECLARED_LABEL_FLAG (label))))
2079 error ("%Hduplicate label `%D'", &location, label);
2080 if (DECL_INITIAL (label))
2081 error ("%H`%D' previously defined here",
2082 &DECL_SOURCE_LOCATION (label), label);
2084 error ("%H`%D' previously declared here",
2085 &DECL_SOURCE_LOCATION (label), label);
2088 else if (label && DECL_CONTEXT (label) == current_function_decl)
2090 /* The label has been used or declared already in this function,
2091 but not defined. Update its location to point to this
2093 DECL_SOURCE_LOCATION (label) = location;
2097 /* No label binding for that identifier; make one. */
2098 label = make_label (name, location);
2100 /* Ordinary labels go in the current function scope, which is
2101 not necessarily the current label scope. */
2102 bind_label (name, label, current_function_scope);
2105 if (warn_traditional && !in_system_header && lookup_name (name))
2106 warning ("%Htraditional C lacks a separate namespace for labels, "
2107 "identifier `%s' conflicts", &location,
2108 IDENTIFIER_POINTER (name));
2110 /* Mark label as having been defined. */
2111 DECL_INITIAL (label) = error_mark_node;
2115 /* Return the list of declarations of the current scope.
2116 Note that this list is in reverse order unless/until
2117 you nreverse it; and when you do nreverse it, you must
2118 store the result back using `storedecls' or you will lose. */
2123 return current_scope->names;
2126 /* Return the list of type-tags (for structs, etc) of the current scope. */
2131 return current_scope->tags;
2134 /* Store the list of declarations of the current scope.
2135 This is done for the parameter declarations of a function being defined,
2136 after they are modified in the light of any missing parameters. */
2139 storedecls (tree decls)
2141 current_scope->names = decls;
2144 /* Similarly, store the list of tags of the current scope. */
2147 storetags (tree tags)
2149 current_scope->tags = tags;
2152 /* Given NAME, an IDENTIFIER_NODE,
2153 return the structure (or union or enum) definition for that name.
2154 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2155 CODE says which kind of type the caller wants;
2156 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2157 If the wrong kind of type is found, an error is reported. */
2160 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2162 tree tag = IDENTIFIER_TAG_VALUE (name);
2168 /* We only care about whether it's in this level if
2169 thislevel_only was set or it might be a type clash. */
2170 if (thislevel_only || TREE_CODE (tag) != code)
2172 if (current_scope == global_scope
2173 || purpose_member (name, current_scope->tags))
2177 if (thislevel_only && !thislevel)
2180 if (TREE_CODE (tag) != code)
2182 /* Definition isn't the kind we were looking for. */
2183 pending_invalid_xref = name;
2184 pending_invalid_xref_location = input_location;
2186 /* If in the same binding level as a declaration as a tag
2187 of a different type, this must not be allowed to
2188 shadow that tag, so give the error immediately.
2189 (For example, "struct foo; union foo;" is invalid.) */
2191 pending_xref_error ();
2196 /* Print an error message now
2197 for a recent invalid struct, union or enum cross reference.
2198 We don't print them immediately because they are not invalid
2199 when used in the `struct foo;' construct for shadowing. */
2202 pending_xref_error (void)
2204 if (pending_invalid_xref != 0)
2205 error ("%H`%s' defined as wrong kind of tag",
2206 &pending_invalid_xref_location,
2207 IDENTIFIER_POINTER (pending_invalid_xref));
2208 pending_invalid_xref = 0;
2212 /* Look up NAME in the current scope and its superiors
2213 in the namespace of variables, functions and typedefs.
2214 Return a ..._DECL node of some kind representing its definition,
2215 or return 0 if it is undefined. */
2218 lookup_name (tree name)
2220 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2221 if (decl == 0 || decl == error_mark_node)
2223 if (C_DECL_INVISIBLE (decl))
2228 /* Similar to `lookup_name' but look only at the current scope. */
2231 lookup_name_current_level (tree name)
2233 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2235 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2238 if (current_scope == global_scope)
2241 /* Scan the current scope for a decl with name NAME. */
2242 if (chain_member (decl, current_scope->names))
2248 /* Create the predefined scalar types of C,
2249 and some nodes representing standard constants (0, 1, (void *) 0).
2250 Initialize the global scope.
2251 Make definitions for built-in primitive functions. */
2254 c_init_decl_processing (void)
2257 tree ptr_ftype_void, ptr_ftype_ptr;
2258 location_t save_loc = input_location;
2260 /* Adds some ggc roots, and reserved words for c-parse.in. */
2263 current_function_decl = NULL;
2264 current_scope = NULL;
2265 current_function_scope = NULL;
2266 scope_freelist = NULL;
2268 /* Make the c_scope structure for global names. */
2270 global_scope = current_scope;
2271 /* Declarations from c_common_nodes_and_builtins must not be associated
2272 with this input file, lest we get differences between using and not
2273 using preprocessed headers. */
2274 input_location.file = "<internal>";
2275 input_location.line = 0;
2277 /* Make the DECL for the toplevel file scope. */
2278 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
2280 build_common_tree_nodes (flag_signed_char);
2282 c_common_nodes_and_builtins ();
2284 /* In C, comparisons and TRUTH_* expressions have type int. */
2285 truthvalue_type_node = integer_type_node;
2286 truthvalue_true_node = integer_one_node;
2287 truthvalue_false_node = integer_zero_node;
2289 /* Even in C99, which has a real boolean type. */
2290 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2291 boolean_type_node));
2293 endlink = void_list_node;
2294 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2296 = build_function_type (ptr_type_node,
2297 tree_cons (NULL_TREE, ptr_type_node, endlink));
2299 input_location = save_loc;
2301 pedantic_lvalues = pedantic;
2303 make_fname_decl = c_make_fname_decl;
2304 start_fname_decls ();
2306 builtin_decls = global_scope->names;
2309 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2310 decl, NAME is the initialization string and TYPE_DEP indicates whether
2311 NAME depended on the type of the function. As we don't yet implement
2312 delayed emission of static data, we mark the decl as emitted
2313 so it is not placed in the output. Anything using it must therefore pull
2314 out the STRING_CST initializer directly. This does mean that these names
2315 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2318 c_make_fname_decl (tree id, int type_dep)
2320 const char *name = fname_as_string (type_dep);
2321 tree decl, type, init;
2322 size_t length = strlen (name);
2324 type = build_array_type
2325 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2326 build_index_type (size_int (length)));
2328 decl = build_decl (VAR_DECL, id, type);
2330 TREE_STATIC (decl) = 1;
2331 TREE_READONLY (decl) = 1;
2332 DECL_ARTIFICIAL (decl) = 1;
2334 init = build_string (length + 1, name);
2335 TREE_TYPE (init) = type;
2336 DECL_INITIAL (decl) = init;
2338 TREE_USED (decl) = 1;
2340 if (current_function_decl)
2341 pushdecl_function_level (decl, DECL_NAME (decl));
2343 finish_decl (decl, init, NULL_TREE);
2348 /* Return a definition for a builtin function named NAME and whose data type
2349 is TYPE. TYPE should be a function type with argument types.
2350 FUNCTION_CODE tells later passes how to compile calls to this function.
2351 See tree.h for its possible values.
2353 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2354 the name to be called if we can't opencode the function. If
2355 ATTRS is nonzero, use that for the function's attribute list. */
2358 builtin_function (const char *name, tree type, int function_code,
2359 enum built_in_class class, const char *library_name,
2362 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2363 DECL_EXTERNAL (decl) = 1;
2364 TREE_PUBLIC (decl) = 1;
2366 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2367 make_decl_rtl (decl, NULL);
2369 DECL_BUILT_IN_CLASS (decl) = class;
2370 DECL_FUNCTION_CODE (decl) = function_code;
2372 /* Warn if a function in the namespace for users
2373 is used without an occasion to consider it declared. */
2374 if (name[0] != '_' || name[1] != '_')
2375 C_DECL_INVISIBLE (decl) = 1;
2377 /* Possibly apply some default attributes to this built-in function. */
2379 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2381 decl_attributes (&decl, NULL_TREE, 0);
2386 /* Apply default attributes to a function, if a system function with default
2390 c_insert_default_attributes (tree decl)
2392 if (!TREE_PUBLIC (decl))
2394 c_common_insert_default_attributes (decl);
2397 /* Called when a declaration is seen that contains no names to declare.
2398 If its type is a reference to a structure, union or enum inherited
2399 from a containing scope, shadow that tag name for the current scope
2400 with a forward reference.
2401 If its type defines a new named structure or union
2402 or defines an enum, it is valid but we need not do anything here.
2403 Otherwise, it is an error. */
2406 shadow_tag (tree declspecs)
2408 shadow_tag_warned (declspecs, 0);
2412 shadow_tag_warned (tree declspecs, int warned)
2415 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2422 pending_invalid_xref = 0;
2424 /* Remove the attributes from declspecs, since they will confuse the
2426 split_specs_attrs (declspecs, &specs, &attrs);
2428 for (link = specs; link; link = TREE_CHAIN (link))
2430 tree value = TREE_VALUE (link);
2431 enum tree_code code = TREE_CODE (value);
2433 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2434 /* Used to test also that TYPE_SIZE (value) != 0.
2435 That caused warning for `struct foo;' at top level in the file. */
2437 tree name = TYPE_NAME (value);
2444 if (warned != 1 && code != ENUMERAL_TYPE)
2445 /* Empty unnamed enum OK */
2447 pedwarn ("unnamed struct/union that defines no instances");
2453 t = lookup_tag (code, name, 1);
2457 t = make_node (code);
2464 if (!warned && ! in_system_header)
2466 warning ("useless keyword or type name in empty declaration");
2473 error ("two types specified in one empty declaration");
2478 pedwarn ("empty declaration");
2482 /* Construct an array declarator. EXPR is the expression inside [], or
2483 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2484 to the pointer to which a parameter array is converted). STATIC_P is
2485 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2486 is nonzero is the array is [*], a VLA of unspecified length which is
2487 nevertheless a complete type (not currently implemented by GCC),
2488 zero otherwise. The declarator is constructed as an ARRAY_REF
2489 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2490 left of the [] (filled by in set_array_declarator_type) and operand 1
2491 is the expression inside; whose TREE_TYPE is the type qualifiers and
2492 which has TREE_STATIC set if "static" is used. */
2495 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2498 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2499 TREE_TYPE (decl) = quals;
2500 TREE_STATIC (decl) = (static_p ? 1 : 0);
2501 if (pedantic && !flag_isoc99)
2503 if (static_p || quals != NULL_TREE)
2504 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2506 pedwarn ("ISO C90 does not support `[*]' array declarators");
2509 warning ("GCC does not yet properly implement `[*]' array declarators");
2513 /* Set the type of an array declarator. DECL is the declarator, as
2514 constructed by build_array_declarator; TYPE is what appears on the left
2515 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2516 abstract declarator, zero otherwise; this is used to reject static and
2517 type qualifiers in abstract declarators, where they are not in the
2521 set_array_declarator_type (tree decl, tree type, int abstract_p)
2523 TREE_OPERAND (decl, 0) = type;
2524 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2525 error ("static or type qualifiers in abstract declarator");
2529 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2532 groktypename (tree typename)
2536 if (TREE_CODE (typename) != TREE_LIST)
2539 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2541 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
2543 /* Apply attributes. */
2544 decl_attributes (&typename, attrs, 0);
2549 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2552 groktypename_in_parm_context (tree typename)
2554 if (TREE_CODE (typename) != TREE_LIST)
2556 return grokdeclarator (TREE_VALUE (typename),
2557 TREE_PURPOSE (typename),
2561 /* Decode a declarator in an ordinary declaration or data definition.
2562 This is called as soon as the type information and variable name
2563 have been parsed, before parsing the initializer if any.
2564 Here we create the ..._DECL node, fill in its type,
2565 and put it on the list of decls for the current context.
2566 The ..._DECL node is returned as the value.
2568 Exception: for arrays where the length is not specified,
2569 the type is left null, to be filled in by `finish_decl'.
2571 Function definitions do not come here; they go to start_function
2572 instead. However, external and forward declarations of functions
2573 do go through here. Structure field declarations are done by
2574 grokfield and not through here. */
2577 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2582 /* An object declared as __attribute__((deprecated)) suppresses
2583 warnings of uses of other deprecated items. */
2584 if (lookup_attribute ("deprecated", attributes))
2585 deprecated_state = DEPRECATED_SUPPRESS;
2587 decl = grokdeclarator (declarator, declspecs,
2588 NORMAL, initialized);
2590 deprecated_state = DEPRECATED_NORMAL;
2592 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2593 && MAIN_NAME_P (DECL_NAME (decl)))
2594 warning ("%H'%D' is usually a function",
2595 &DECL_SOURCE_LOCATION (decl), decl);
2598 /* Is it valid for this decl to have an initializer at all?
2599 If not, set INITIALIZED to zero, which will indirectly
2600 tell `finish_decl' to ignore the initializer once it is parsed. */
2601 switch (TREE_CODE (decl))
2604 error ("typedef `%s' is initialized (use __typeof__ instead)",
2605 IDENTIFIER_POINTER (DECL_NAME (decl)));
2610 error ("function `%s' is initialized like a variable",
2611 IDENTIFIER_POINTER (DECL_NAME (decl)));
2616 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2617 error ("parameter `%s' is initialized",
2618 IDENTIFIER_POINTER (DECL_NAME (decl)));
2623 /* Don't allow initializations for incomplete types
2624 except for arrays which might be completed by the initialization. */
2626 /* This can happen if the array size is an undefined macro. We already
2627 gave a warning, so we don't need another one. */
2628 if (TREE_TYPE (decl) == error_mark_node)
2630 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2632 /* A complete type is ok if size is fixed. */
2634 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2635 || C_DECL_VARIABLE_SIZE (decl))
2637 error ("variable-sized object may not be initialized");
2641 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2643 error ("variable `%s' has initializer but incomplete type",
2644 IDENTIFIER_POINTER (DECL_NAME (decl)));
2647 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2649 error ("elements of array `%s' have incomplete type",
2650 IDENTIFIER_POINTER (DECL_NAME (decl)));
2657 DECL_EXTERNAL (decl) = 0;
2658 if (current_scope == global_scope)
2659 TREE_STATIC (decl) = 1;
2661 /* Tell `pushdecl' this is an initialized decl
2662 even though we don't yet have the initializer expression.
2663 Also tell `finish_decl' it may store the real initializer. */
2664 DECL_INITIAL (decl) = error_mark_node;
2667 /* If this is a function declaration, write a record describing it to the
2668 prototypes file (if requested). */
2670 if (TREE_CODE (decl) == FUNCTION_DECL)
2671 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2673 /* ANSI specifies that a tentative definition which is not merged with
2674 a non-tentative definition behaves exactly like a definition with an
2675 initializer equal to zero. (Section 3.7.2)
2677 -fno-common gives strict ANSI behavior, though this tends to break
2678 a large body of code that grew up without this rule.
2680 Thread-local variables are never common, since there's no entrenched
2681 body of code to break, and it allows more efficient variable references
2682 in the presence of dynamic linking. */
2684 if (TREE_CODE (decl) == VAR_DECL
2686 && TREE_PUBLIC (decl)
2687 && !DECL_THREAD_LOCAL (decl)
2689 DECL_COMMON (decl) = 1;
2691 /* Set attributes here so if duplicate decl, will have proper attributes. */
2692 decl_attributes (&decl, attributes, 0);
2694 if (TREE_CODE (decl) == FUNCTION_DECL
2695 && DECL_DECLARED_INLINE_P (decl)
2696 && DECL_UNINLINABLE (decl)
2697 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2698 warning ("%Hinline function '%D' given attribute noinline",
2699 &DECL_SOURCE_LOCATION (decl), decl);
2701 /* Add this decl to the current scope.
2702 TEM may equal DECL or it may be a previous decl of the same name. */
2703 tem = pushdecl (decl);
2705 /* For a local variable, define the RTL now. */
2706 if (current_scope != global_scope
2707 /* But not if this is a duplicate decl
2708 and we preserved the rtl from the previous one
2709 (which may or may not happen). */
2710 && !DECL_RTL_SET_P (tem)
2711 && C_DECL_FILE_SCOPE (tem))
2713 if (TREE_TYPE (tem) != error_mark_node
2714 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
2716 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2717 && DECL_INITIAL (tem) != 0)
2724 /* Finish processing of a declaration;
2725 install its initial value.
2726 If the length of an array type is not known before,
2727 it must be determined now, from the initial value, or it is an error. */
2730 finish_decl (tree decl, tree init, tree asmspec_tree)
2732 tree type = TREE_TYPE (decl);
2733 int was_incomplete = (DECL_SIZE (decl) == 0);
2734 const char *asmspec = 0;
2736 /* If a name was specified, get the string. */
2737 if (current_scope == global_scope)
2738 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2740 asmspec = TREE_STRING_POINTER (asmspec_tree);
2742 /* If `start_decl' didn't like having an initialization, ignore it now. */
2743 if (init != 0 && DECL_INITIAL (decl) == 0)
2746 /* Don't crash if parm is initialized. */
2747 if (TREE_CODE (decl) == PARM_DECL)
2751 store_init_value (decl, init);
2753 /* Deduce size of array from initialization, if not already known */
2754 if (TREE_CODE (type) == ARRAY_TYPE
2755 && TYPE_DOMAIN (type) == 0
2756 && TREE_CODE (decl) != TYPE_DECL)
2759 = (TREE_STATIC (decl)
2760 /* Even if pedantic, an external linkage array
2761 may have incomplete type at first. */
2762 ? pedantic && !TREE_PUBLIC (decl)
2763 : !DECL_EXTERNAL (decl));
2765 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2767 /* Get the completed type made by complete_array_type. */
2768 type = TREE_TYPE (decl);
2771 error ("%Hinitializer fails to determine size of '%D'",
2772 &DECL_SOURCE_LOCATION (decl), decl);
2774 else if (failure == 2)
2777 error ("%Harray size missing in '%D'",
2778 &DECL_SOURCE_LOCATION (decl), decl);
2779 /* If a `static' var's size isn't known,
2780 make it extern as well as static, so it does not get
2782 If it is not `static', then do not mark extern;
2783 finish_incomplete_decl will give it a default size
2784 and it will get allocated. */
2785 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2786 DECL_EXTERNAL (decl) = 1;
2789 /* TYPE_MAX_VALUE is always one less than the number of elements
2790 in the array, because we start counting at zero. Therefore,
2791 warn only if the value is less than zero. */
2792 else if (pedantic && TYPE_DOMAIN (type) != 0
2793 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2794 error ("%Hzero or negative size array '%D'",
2795 &DECL_SOURCE_LOCATION (decl), decl);
2797 layout_decl (decl, 0);
2800 if (TREE_CODE (decl) == VAR_DECL)
2802 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2803 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2804 layout_decl (decl, 0);
2806 if (DECL_SIZE (decl) == 0
2807 /* Don't give an error if we already gave one earlier. */
2808 && TREE_TYPE (decl) != error_mark_node
2809 && (TREE_STATIC (decl)
2811 /* A static variable with an incomplete type
2812 is an error if it is initialized.
2813 Also if it is not file scope.
2814 Otherwise, let it through, but if it is not `extern'
2815 then it may cause an error message later. */
2816 (DECL_INITIAL (decl) != 0
2817 || !C_DECL_FILE_SCOPE (decl))
2819 /* An automatic variable with an incomplete type
2821 !DECL_EXTERNAL (decl)))
2823 error ("%Hstorage size of '%D' isn't known",
2824 &DECL_SOURCE_LOCATION (decl), decl);
2825 TREE_TYPE (decl) = error_mark_node;
2828 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2829 && DECL_SIZE (decl) != 0)
2831 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2832 constant_expression_warning (DECL_SIZE (decl));
2834 error ("%Hstorage size of '%D' isn't constant",
2835 &DECL_SOURCE_LOCATION (decl), decl);
2838 if (TREE_USED (type))
2839 TREE_USED (decl) = 1;
2842 /* If this is a function and an assembler name is specified, reset DECL_RTL
2843 so we can give it its new name. Also, update built_in_decls if it
2844 was a normal built-in. */
2845 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2847 /* ASMSPEC is given, and not the name of a register. Mark the
2848 name with a star so assemble_name won't munge it. */
2849 char *starred = alloca (strlen (asmspec) + 2);
2851 strcpy (starred + 1, asmspec);
2853 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2855 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2856 SET_DECL_RTL (builtin, NULL_RTX);
2857 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2858 #ifdef TARGET_MEM_FUNCTIONS
2859 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2860 init_block_move_fn (starred);
2861 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2862 init_block_clear_fn (starred);
2864 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2865 init_block_move_fn (starred);
2866 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2867 init_block_clear_fn (starred);
2870 SET_DECL_RTL (decl, NULL_RTX);
2871 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (starred));
2874 /* If #pragma weak was used, mark the decl weak now. */
2875 if (current_scope == global_scope)
2876 maybe_apply_pragma_weak (decl);
2878 /* Output the assembler code and/or RTL code for variables and functions,
2879 unless the type is an undefined structure or union.
2880 If not, it will get done when the type is completed. */
2882 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2884 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2885 if (c_dialect_objc ())
2886 objc_check_decl (decl);
2888 if (C_DECL_FILE_SCOPE (decl))
2890 if (DECL_INITIAL (decl) == NULL_TREE
2891 || DECL_INITIAL (decl) == error_mark_node)
2892 /* Don't output anything
2893 when a tentative file-scope definition is seen.
2894 But at end of compilation, do output code for them. */
2895 DECL_DEFER_OUTPUT (decl) = 1;
2896 rest_of_decl_compilation (decl, asmspec, true, 0);
2900 /* This is a local variable. If there is an ASMSPEC, the
2901 user has requested that we handle it specially. */
2904 /* In conjunction with an ASMSPEC, the `register'
2905 keyword indicates that we should place the variable
2906 in a particular register. */
2907 if (DECL_REGISTER (decl))
2908 DECL_C_HARD_REGISTER (decl) = 1;
2910 /* If this is not a static variable, issue a warning.
2911 It doesn't make any sense to give an ASMSPEC for an
2912 ordinary, non-register local variable. Historically,
2913 GCC has accepted -- but ignored -- the ASMSPEC in
2915 if (TREE_CODE (decl) == VAR_DECL
2916 && !DECL_REGISTER (decl)
2917 && !TREE_STATIC (decl))
2918 warning ("%Hignoring asm-specifier for non-static local "
2919 "variable '%D'", &DECL_SOURCE_LOCATION (decl), decl);
2921 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
2924 if (TREE_CODE (decl) != FUNCTION_DECL)
2925 add_decl_stmt (decl);
2928 if (!C_DECL_FILE_SCOPE (decl))
2930 /* Recompute the RTL of a local array now
2931 if it used to be an incomplete type. */
2933 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2935 /* If we used it already as memory, it must stay in memory. */
2936 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2937 /* If it's still incomplete now, no init will save it. */
2938 if (DECL_SIZE (decl) == 0)
2939 DECL_INITIAL (decl) = 0;
2944 /* If this was marked 'used', be sure it will be output. */
2945 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2946 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2948 if (TREE_CODE (decl) == TYPE_DECL)
2950 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2951 if (c_dialect_objc ())
2952 objc_check_decl (decl);
2953 rest_of_decl_compilation (decl, NULL, C_DECL_FILE_SCOPE (decl), 0);
2956 /* At the end of a declaration, throw away any variable type sizes
2957 of types defined inside that declaration. There is no use
2958 computing them in the following function definition. */
2959 if (current_scope == global_scope)
2960 get_pending_sizes ();
2962 /* Install a cleanup (aka destructor) if one was given. */
2963 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2965 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2968 static bool eh_initialized_p;
2970 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2971 tree cleanup_decl = lookup_name (cleanup_id);
2974 /* Build "cleanup(&decl)" for the destructor. */
2975 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2976 cleanup = build_tree_list (NULL_TREE, cleanup);
2977 cleanup = build_function_call (cleanup_decl, cleanup);
2979 /* Don't warn about decl unused; the cleanup uses it. */
2980 TREE_USED (decl) = 1;
2982 /* Initialize EH, if we've been told to do so. */
2983 if (flag_exceptions && !eh_initialized_p)
2985 eh_initialized_p = true;
2986 eh_personality_libfunc
2987 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
2988 ? "__gcc_personality_sj0"
2989 : "__gcc_personality_v0");
2990 using_eh_for_cleanups ();
2993 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
2998 /* Given a parsed parameter declaration,
2999 decode it into a PARM_DECL and push that on the current scope.
3000 Also, for the sake of forward parm decls,
3001 record the given order of parms in `parm_order'. */
3004 push_parm_decl (tree parm)
3007 int old_immediate_size_expand = immediate_size_expand;
3008 /* Don't try computing parm sizes now -- wait till fn is called. */
3009 immediate_size_expand = 0;
3011 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3012 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3013 decl_attributes (&decl, TREE_VALUE (parm), 0);
3015 decl = pushdecl (decl);
3017 immediate_size_expand = old_immediate_size_expand;
3019 current_scope->parm_order
3020 = tree_cons (NULL_TREE, decl, current_scope->parm_order);
3022 /* Add this decl to the current scope. */
3023 finish_decl (decl, NULL_TREE, NULL_TREE);
3026 /* Clear the given order of parms in `parm_order'.
3027 Used at start of parm list,
3028 and also at semicolon terminating forward decls. */
3031 clear_parm_order (void)
3033 current_scope->parm_order = NULL_TREE;
3036 static GTY(()) int compound_literal_number;
3038 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3039 literal, which may be an incomplete array type completed by the
3040 initializer; INIT is a CONSTRUCTOR that initializes the compound
3044 build_compound_literal (tree type, tree init)
3046 /* We do not use start_decl here because we have a type, not a declarator;
3047 and do not use finish_decl because the decl should be stored inside
3048 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3049 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3052 DECL_EXTERNAL (decl) = 0;
3053 TREE_PUBLIC (decl) = 0;
3054 TREE_STATIC (decl) = (current_scope == global_scope);
3055 DECL_CONTEXT (decl) = current_function_decl;
3056 TREE_USED (decl) = 1;
3057 TREE_TYPE (decl) = type;
3058 TREE_READONLY (decl) = TREE_READONLY (type);
3059 store_init_value (decl, init);
3061 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3063 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3068 type = TREE_TYPE (decl);
3069 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3070 return error_mark_node;
3072 stmt = build_stmt (DECL_STMT, decl);
3073 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3074 TREE_SIDE_EFFECTS (complit) = 1;
3076 layout_decl (decl, 0);
3078 if (TREE_STATIC (decl))
3080 /* This decl needs a name for the assembler output. We also need
3081 a unique suffix to be added to the name. */
3084 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3085 compound_literal_number);
3086 compound_literal_number++;
3087 DECL_NAME (decl) = get_identifier (name);
3088 DECL_DEFER_OUTPUT (decl) = 1;
3089 DECL_COMDAT (decl) = 1;
3090 DECL_ARTIFICIAL (decl) = 1;
3092 rest_of_decl_compilation (decl, NULL, 1, 0);
3098 /* Make TYPE a complete type based on INITIAL_VALUE.
3099 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3100 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3103 complete_array_type (tree type, tree initial_value, int do_default)
3105 tree maxindex = NULL_TREE;
3110 /* Note MAXINDEX is really the maximum index,
3111 one less than the size. */
3112 if (TREE_CODE (initial_value) == STRING_CST)
3115 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3116 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3119 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3121 tree elts = CONSTRUCTOR_ELTS (initial_value);
3122 maxindex = build_int_2 (-1, -1);
3123 for (; elts; elts = TREE_CHAIN (elts))
3125 if (TREE_PURPOSE (elts))
3126 maxindex = TREE_PURPOSE (elts);
3128 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3129 maxindex, integer_one_node));
3131 maxindex = copy_node (maxindex);
3135 /* Make an error message unless that happened already. */
3136 if (initial_value != error_mark_node)
3139 /* Prevent further error messages. */
3140 maxindex = build_int_2 (0, 0);
3147 maxindex = build_int_2 (0, 0);
3153 TYPE_DOMAIN (type) = build_index_type (maxindex);
3154 if (!TREE_TYPE (maxindex))
3155 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3158 /* Lay out the type now that we can get the real answer. */
3165 /* Determine whether TYPE is a structure with a flexible array member,
3166 or a union containing such a structure (possibly recursively). */
3169 flexible_array_type_p (tree type)
3172 switch (TREE_CODE (type))
3175 x = TYPE_FIELDS (type);
3178 while (TREE_CHAIN (x) != NULL_TREE)
3180 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3181 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3182 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3183 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3187 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3189 if (flexible_array_type_p (TREE_TYPE (x)))
3198 /* Given declspecs and a declarator,
3199 determine the name and type of the object declared
3200 and construct a ..._DECL node for it.
3201 (In one case we can return a ..._TYPE node instead.
3202 For invalid input we sometimes return 0.)
3204 DECLSPECS is a chain of tree_list nodes whose value fields
3205 are the storage classes and type specifiers.
3207 DECL_CONTEXT says which syntactic context this declaration is in:
3208 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3209 FUNCDEF for a function definition. Like NORMAL but a few different
3210 error messages in each case. Return value may be zero meaning
3211 this definition is too screwy to try to parse.
3212 PARM for a parameter declaration (either within a function prototype
3213 or before a function body). Make a PARM_DECL, or return void_type_node.
3214 TYPENAME if for a typename (in a cast or sizeof).
3215 Don't make a DECL node; just return the ..._TYPE node.
3216 FIELD for a struct or union field; make a FIELD_DECL.
3217 BITFIELD for a field with specified width.
3218 INITIALIZED is 1 if the decl has an initializer.
3220 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3221 It may also be so in the PARM case, for a prototype where the
3222 argument type is specified but not the name.
3224 This function is where the complicated C meanings of `static'
3225 and `extern' are interpreted. */
3228 grokdeclarator (tree declarator, tree declspecs,
3229 enum decl_context decl_context, int initialized)
3233 tree type = NULL_TREE;
3238 int type_quals = TYPE_UNQUALIFIED;
3240 int explicit_int = 0;
3241 int explicit_char = 0;
3242 int defaulted_int = 0;
3243 tree typedef_decl = 0;
3245 tree typedef_type = 0;
3246 int funcdef_flag = 0;
3247 enum tree_code innermost_code = ERROR_MARK;
3249 int size_varies = 0;
3250 tree decl_attr = NULL_TREE;
3251 tree array_ptr_quals = NULL_TREE;
3252 int array_parm_static = 0;
3253 tree returned_attrs = NULL_TREE;
3255 if (decl_context == BITFIELD)
3256 bitfield = 1, decl_context = FIELD;
3258 if (decl_context == FUNCDEF)
3259 funcdef_flag = 1, decl_context = NORMAL;
3261 /* Look inside a declarator for the name being declared
3262 and get it as a string, for an error message. */
3264 tree decl = declarator;
3268 switch (TREE_CODE (decl))
3273 innermost_code = TREE_CODE (decl);
3274 decl = TREE_OPERAND (decl, 0);
3278 decl = TREE_VALUE (decl);
3281 case IDENTIFIER_NODE:
3282 name = IDENTIFIER_POINTER (decl);
3293 /* A function definition's declarator must have the form of
3294 a function declarator. */
3296 if (funcdef_flag && innermost_code != CALL_EXPR)
3299 /* If this looks like a function definition, make it one,
3300 even if it occurs where parms are expected.
3301 Then store_parm_decls will reject it and not use it as a parm. */
3302 if (decl_context == NORMAL && !funcdef_flag
3303 && current_scope->parm_flag)
3304 decl_context = PARM;
3306 /* Look through the decl specs and record which ones appear.
3307 Some typespecs are defined as built-in typenames.
3308 Others, the ones that are modifiers of other types,
3309 are represented by bits in SPECBITS: set the bits for
3310 the modifiers that appear. Storage class keywords are also in SPECBITS.
3312 If there is a typedef name or a type, store the type in TYPE.
3313 This includes builtin typedefs such as `int'.
3315 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3316 and did not come from a user typedef.
3318 Set LONGLONG if `long' is mentioned twice. */
3320 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3322 tree id = TREE_VALUE (spec);
3324 /* If the entire declaration is itself tagged as deprecated then
3325 suppress reports of deprecated items. */
3326 if (id && TREE_DEPRECATED (id))
3328 if (deprecated_state != DEPRECATED_SUPPRESS)
3329 warn_deprecated_use (id);
3332 if (id == ridpointers[(int) RID_INT])
3334 if (id == ridpointers[(int) RID_CHAR])
3337 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3339 enum rid i = C_RID_CODE (id);
3340 if ((int) i <= (int) RID_LAST_MODIFIER)
3342 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3345 error ("`long long long' is too long for GCC");
3348 if (pedantic && !flag_isoc99 && ! in_system_header
3350 pedwarn ("ISO C90 does not support `long long'");
3354 else if (specbits & (1 << (int) i))
3356 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3359 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3362 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3365 /* Diagnose "__thread extern". Recall that this list
3366 is in the reverse order seen in the text. */
3368 && (specbits & (1 << (int) RID_EXTERN
3369 | 1 << (int) RID_STATIC)))
3371 if (specbits & 1 << (int) RID_EXTERN)
3372 error ("`__thread' before `extern'");
3374 error ("`__thread' before `static'");
3377 specbits |= 1 << (int) i;
3382 error ("two or more data types in declaration of `%s'", name);
3383 /* Actual typedefs come to us as TYPE_DECL nodes. */
3384 else if (TREE_CODE (id) == TYPE_DECL)
3386 if (TREE_TYPE (id) == error_mark_node)
3387 ; /* Allow the type to default to int to avoid cascading errors. */
3390 type = TREE_TYPE (id);
3391 decl_attr = DECL_ATTRIBUTES (id);
3395 /* Built-in types come as identifiers. */
3396 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3398 tree t = lookup_name (id);
3399 if (TREE_TYPE (t) == error_mark_node)
3401 else if (!t || TREE_CODE (t) != TYPE_DECL)
3402 error ("`%s' fails to be a typedef or built in type",
3403 IDENTIFIER_POINTER (id));
3406 type = TREE_TYPE (t);
3410 else if (TREE_CODE (id) != ERROR_MARK)
3417 typedef_type = type;
3419 size_varies = C_TYPE_VARIABLE_SIZE (type);
3421 /* No type at all: default to `int', and set DEFAULTED_INT
3422 because it was not a user-defined typedef. */
3426 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3427 | (1 << (int) RID_SIGNED)
3428 | (1 << (int) RID_UNSIGNED)
3429 | (1 << (int) RID_COMPLEX))))
3430 /* Don't warn about typedef foo = bar. */
3431 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3432 && ! in_system_header)
3434 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3435 and this is a function, or if -Wimplicit; prefer the former
3436 warning since it is more explicit. */
3437 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3439 warn_about_return_type = 1;
3440 else if (warn_implicit_int || flag_isoc99)
3441 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3446 type = integer_type_node;
3449 /* Now process the modifiers that were specified
3450 and check for invalid combinations. */
3452 /* Long double is a special combination. */
3454 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3455 && TYPE_MAIN_VARIANT (type) == double_type_node)
3457 specbits &= ~(1 << (int) RID_LONG);
3458 type = long_double_type_node;
3461 /* Check all other uses of type modifiers. */
3463 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3464 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3468 if ((specbits & 1 << (int) RID_LONG)
3469 && (specbits & 1 << (int) RID_SHORT))
3470 error ("both long and short specified for `%s'", name);
3471 else if (((specbits & 1 << (int) RID_LONG)
3472 || (specbits & 1 << (int) RID_SHORT))
3474 error ("long or short specified with char for `%s'", name);
3475 else if (((specbits & 1 << (int) RID_LONG)
3476 || (specbits & 1 << (int) RID_SHORT))
3477 && TREE_CODE (type) == REAL_TYPE)
3479 static int already = 0;
3481 error ("long or short specified with floating type for `%s'", name);
3482 if (! already && ! pedantic)
3484 error ("the only valid combination is `long double'");
3488 else if ((specbits & 1 << (int) RID_SIGNED)
3489 && (specbits & 1 << (int) RID_UNSIGNED))
3490 error ("both signed and unsigned specified for `%s'", name);
3491 else if (TREE_CODE (type) != INTEGER_TYPE)
3492 error ("long, short, signed or unsigned invalid for `%s'", name);
3496 if (!explicit_int && !defaulted_int && !explicit_char)
3498 error ("long, short, signed or unsigned used invalidly for `%s'",
3504 /* Discard the type modifiers if they are invalid. */
3507 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3508 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3513 if ((specbits & (1 << (int) RID_COMPLEX))
3514 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3516 error ("complex invalid for `%s'", name);
3517 specbits &= ~(1 << (int) RID_COMPLEX);
3520 /* Decide whether an integer type is signed or not.
3521 Optionally treat bitfields as signed by default. */
3522 if (specbits & 1 << (int) RID_UNSIGNED
3523 || (bitfield && ! flag_signed_bitfields
3524 && (explicit_int || defaulted_int || explicit_char
3525 /* A typedef for plain `int' without `signed'
3526 can be controlled just like plain `int'. */
3527 || ! (typedef_decl != 0
3528 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3529 && TREE_CODE (type) != ENUMERAL_TYPE
3530 && !(specbits & 1 << (int) RID_SIGNED)))
3533 type = long_long_unsigned_type_node;
3534 else if (specbits & 1 << (int) RID_LONG)
3535 type = long_unsigned_type_node;
3536 else if (specbits & 1 << (int) RID_SHORT)
3537 type = short_unsigned_type_node;
3538 else if (type == char_type_node)
3539 type = unsigned_char_type_node;
3540 else if (typedef_decl)
3541 type = c_common_unsigned_type (type);
3543 type = unsigned_type_node;
3545 else if ((specbits & 1 << (int) RID_SIGNED)
3546 && type == char_type_node)
3547 type = signed_char_type_node;
3549 type = long_long_integer_type_node;
3550 else if (specbits & 1 << (int) RID_LONG)
3551 type = long_integer_type_node;
3552 else if (specbits & 1 << (int) RID_SHORT)
3553 type = short_integer_type_node;
3555 if (specbits & 1 << (int) RID_COMPLEX)
3557 if (pedantic && !flag_isoc99)
3558 pedwarn ("ISO C90 does not support complex types");
3559 /* If we just have "complex", it is equivalent to
3560 "complex double", but if any modifiers at all are specified it is
3561 the complex form of TYPE. E.g, "complex short" is
3562 "complex short int". */
3564 if (defaulted_int && ! longlong
3565 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3566 | (1 << (int) RID_SIGNED)
3567 | (1 << (int) RID_UNSIGNED))))
3570 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3571 type = complex_double_type_node;
3573 else if (type == integer_type_node)
3576 pedwarn ("ISO C does not support complex integer types");
3577 type = complex_integer_type_node;
3579 else if (type == float_type_node)
3580 type = complex_float_type_node;
3581 else if (type == double_type_node)
3582 type = complex_double_type_node;
3583 else if (type == long_double_type_node)
3584 type = complex_long_double_type_node;
3588 pedwarn ("ISO C does not support complex integer types");
3589 type = build_complex_type (type);
3593 /* Figure out the type qualifiers for the declaration. There are
3594 two ways a declaration can become qualified. One is something
3595 like `const int i' where the `const' is explicit. Another is
3596 something like `typedef const int CI; CI i' where the type of the
3597 declaration contains the `const'. */
3598 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3599 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
3600 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3601 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3602 if (constp > 1 && ! flag_isoc99)
3603 pedwarn ("duplicate `const'");
3604 if (restrictp > 1 && ! flag_isoc99)
3605 pedwarn ("duplicate `restrict'");
3606 if (volatilep > 1 && ! flag_isoc99)
3607 pedwarn ("duplicate `volatile'");
3608 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3609 type = TYPE_MAIN_VARIANT (type);
3610 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3611 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3612 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3614 /* Warn if two storage classes are given. Default to `auto'. */
3619 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3620 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3621 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3622 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3623 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3625 /* "static __thread" and "extern __thread" are allowed. */
3626 if ((specbits & (1 << (int) RID_THREAD
3627 | 1 << (int) RID_STATIC
3628 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3631 /* Warn about storage classes that are invalid for certain
3632 kinds of declarations (parameters, typenames, etc.). */
3635 error ("multiple storage classes in declaration of `%s'", name);
3636 else if (funcdef_flag
3638 & ((1 << (int) RID_REGISTER)
3639 | (1 << (int) RID_AUTO)
3640 | (1 << (int) RID_TYPEDEF)
3641 | (1 << (int) RID_THREAD))))
3643 if (specbits & 1 << (int) RID_AUTO
3644 && (pedantic || current_scope == global_scope))
3645 pedwarn ("function definition declared `auto'");
3646 if (specbits & 1 << (int) RID_REGISTER)
3647 error ("function definition declared `register'");
3648 if (specbits & 1 << (int) RID_TYPEDEF)
3649 error ("function definition declared `typedef'");
3650 if (specbits & 1 << (int) RID_THREAD)
3651 error ("function definition declared `__thread'");
3652 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3653 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3655 else if (decl_context != NORMAL && nclasses > 0)
3657 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3661 switch (decl_context)
3664 error ("storage class specified for structure field `%s'",
3668 error ("storage class specified for parameter `%s'", name);
3671 error ("storage class specified for typename");
3674 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3675 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3676 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3679 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3681 /* `extern' with initialization is invalid if not at file scope. */
3682 if (current_scope == global_scope)
3683 warning ("`%s' initialized and declared `extern'", name);
3685 error ("`%s' has both `extern' and initializer", name);
3687 else if (current_scope == global_scope)
3689 if (specbits & 1 << (int) RID_AUTO)
3690 error ("file-scope declaration of `%s' specifies `auto'", name);
3694 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3695 error ("nested function `%s' declared `extern'", name);
3696 else if ((specbits & (1 << (int) RID_THREAD
3697 | 1 << (int) RID_EXTERN
3698 | 1 << (int) RID_STATIC))
3699 == (1 << (int) RID_THREAD))
3701 error ("function-scope `%s' implicitly auto and declared `__thread'",
3703 specbits &= ~(1 << (int) RID_THREAD);
3708 /* Now figure out the structure of the declarator proper.
3709 Descend through it, creating more complex types, until we reach
3710 the declared identifier (or NULL_TREE, in an absolute declarator). */
3712 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3714 if (type == error_mark_node)
3716 declarator = TREE_OPERAND (declarator, 0);
3720 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3721 an INDIRECT_REF (for *...),
3722 a CALL_EXPR (for ...(...)),
3723 a TREE_LIST (for nested attributes),
3724 an identifier (for the name being declared)
3725 or a null pointer (for the place in an absolute declarator
3726 where the name was omitted).
3727 For the last two cases, we have just exited the loop.
3729 At this point, TYPE is the type of elements of an array,
3730 or for a function to return, or for a pointer to point to.
3731 After this sequence of ifs, TYPE is the type of the
3732 array or function or pointer, and DECLARATOR has had its
3733 outermost layer removed. */
3735 if (array_ptr_quals != NULL_TREE || array_parm_static)
3737 /* Only the innermost declarator (making a parameter be of
3738 array type which is converted to pointer type)
3739 may have static or type qualifiers. */
3740 error ("static or type qualifiers in non-parameter array declarator");
3741 array_ptr_quals = NULL_TREE;
3742 array_parm_static = 0;
3745 if (TREE_CODE (declarator) == TREE_LIST)
3747 /* We encode a declarator with embedded attributes using
3749 tree attrs = TREE_PURPOSE (declarator);
3752 declarator = TREE_VALUE (declarator);
3753 inner_decl = declarator;
3754 while (inner_decl != NULL_TREE
3755 && TREE_CODE (inner_decl) == TREE_LIST)
3756 inner_decl = TREE_VALUE (inner_decl);
3757 if (inner_decl == NULL_TREE
3758 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3759 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3760 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3761 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3762 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3763 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3764 returned_attrs = decl_attributes (&type,
3765 chainon (returned_attrs, attrs),
3768 else if (TREE_CODE (declarator) == ARRAY_REF)
3770 tree itype = NULL_TREE;
3771 tree size = TREE_OPERAND (declarator, 1);
3772 /* The index is a signed object `sizetype' bits wide. */
3773 tree index_type = c_common_signed_type (sizetype);
3775 array_ptr_quals = TREE_TYPE (declarator);
3776 array_parm_static = TREE_STATIC (declarator);
3778 declarator = TREE_OPERAND (declarator, 0);
3780 /* Check for some types that there cannot be arrays of. */
3782 if (VOID_TYPE_P (type))
3784 error ("declaration of `%s' as array of voids", name);
3785 type = error_mark_node;
3788 if (TREE_CODE (type) == FUNCTION_TYPE)
3790 error ("declaration of `%s' as array of functions", name);
3791 type = error_mark_node;
3794 if (pedantic && flexible_array_type_p (type))
3795 pedwarn ("invalid use of structure with flexible array member");
3797 if (size == error_mark_node)
3798 type = error_mark_node;
3800 if (type == error_mark_node)
3803 /* If size was specified, set ITYPE to a range-type for that size.
3804 Otherwise, ITYPE remains null. finish_decl may figure it out
3805 from an initial value. */
3809 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3810 STRIP_TYPE_NOPS (size);
3812 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3814 error ("size of array `%s' has non-integer type", name);
3815 size = integer_one_node;
3818 if (pedantic && integer_zerop (size))
3819 pedwarn ("ISO C forbids zero-size array `%s'", name);
3821 if (TREE_CODE (size) == INTEGER_CST)
3823 constant_expression_warning (size);
3824 if (tree_int_cst_sgn (size) < 0)
3826 error ("size of array `%s' is negative", name);
3827 size = integer_one_node;
3832 /* Make sure the array size remains visibly nonconstant
3833 even if it is (eg) a const variable with known value. */
3836 if (!flag_isoc99 && pedantic)
3838 if (TREE_CONSTANT (size))
3839 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3842 pedwarn ("ISO C90 forbids variable-size array `%s'",
3847 if (integer_zerop (size))
3849 /* A zero-length array cannot be represented with an
3850 unsigned index type, which is what we'll get with
3851 build_index_type. Create an open-ended range instead. */
3852 itype = build_range_type (sizetype, size, NULL_TREE);
3856 /* Compute the maximum valid index, that is, size - 1.
3857 Do the calculation in index_type, so that if it is
3858 a variable the computations will be done in the
3860 itype = fold (build (MINUS_EXPR, index_type,
3861 convert (index_type, size),
3862 convert (index_type, size_one_node)));
3864 /* If that overflowed, the array is too big.
3865 ??? While a size of INT_MAX+1 technically shouldn't
3866 cause an overflow (because we subtract 1), the overflow
3867 is recorded during the conversion to index_type, before
3868 the subtraction. Handling this case seems like an
3869 unnecessary complication. */
3870 if (TREE_OVERFLOW (itype))
3872 error ("size of array `%s' is too large", name);
3873 type = error_mark_node;
3879 /* We must be able to distinguish the
3880 SAVE_EXPR_CONTEXT for the variably-sized type
3881 so that we can set it correctly in
3882 set_save_expr_context. The convention is
3883 that all SAVE_EXPRs that need to be reset
3884 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3885 tree cfd = current_function_decl;
3886 if (decl_context == PARM)
3887 current_function_decl = NULL_TREE;
3888 itype = variable_size (itype);
3889 if (decl_context == PARM)
3890 current_function_decl = cfd;
3892 itype = build_index_type (itype);
3895 else if (decl_context == FIELD)
3897 if (pedantic && !flag_isoc99 && !in_system_header)
3898 pedwarn ("ISO C90 does not support flexible array members");
3900 /* ISO C99 Flexible array members are effectively identical
3901 to GCC's zero-length array extension. */
3902 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3905 /* If pedantic, complain about arrays of incomplete types. */
3907 if (pedantic && !COMPLETE_TYPE_P (type))
3908 pedwarn ("array type has incomplete element type");
3910 /* Build the array type itself, then merge any constancy or
3911 volatility into the target type. We must do it in this order
3912 to ensure that the TYPE_MAIN_VARIANT field of the array type
3913 is set correctly. */
3915 type = build_array_type (type, itype);
3917 type = c_build_qualified_type (type, type_quals);
3920 C_TYPE_VARIABLE_SIZE (type) = 1;
3922 /* The GCC extension for zero-length arrays differs from
3923 ISO flexible array members in that sizeof yields zero. */
3924 if (size && integer_zerop (size))
3927 TYPE_SIZE (type) = bitsize_zero_node;
3928 TYPE_SIZE_UNIT (type) = size_zero_node;
3930 if (decl_context != PARM
3931 && (array_ptr_quals != NULL_TREE || array_parm_static))
3933 error ("static or type qualifiers in non-parameter array declarator");
3934 array_ptr_quals = NULL_TREE;
3935 array_parm_static = 0;
3938 else if (TREE_CODE (declarator) == CALL_EXPR)
3942 /* Declaring a function type.
3943 Make sure we have a valid type for the function to return. */
3944 if (type == error_mark_node)
3949 /* Warn about some types functions can't return. */
3951 if (TREE_CODE (type) == FUNCTION_TYPE)
3953 error ("`%s' declared as function returning a function", name);
3954 type = integer_type_node;
3956 if (TREE_CODE (type) == ARRAY_TYPE)
3958 error ("`%s' declared as function returning an array", name);
3959 type = integer_type_node;
3962 /* Construct the function type and go to the next
3963 inner layer of declarator. */
3965 arg_types = grokparms (TREE_OPERAND (declarator, 1),
3967 /* Say it's a definition
3968 only for the CALL_EXPR
3969 closest to the identifier. */
3970 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
3971 /* Type qualifiers before the return type of the function
3972 qualify the return type, not the function type. */
3975 /* Type qualifiers on a function return type are normally
3976 permitted by the standard but have no effect, so give a
3977 warning at -Wextra. Qualifiers on a void return type have
3978 meaning as a GNU extension, and are banned on function
3979 definitions in ISO C. FIXME: strictly we shouldn't
3980 pedwarn for qualified void return types except on function
3981 definitions, but not doing so could lead to the undesirable
3982 state of a "volatile void" function return type not being
3983 warned about, and a use of the function being compiled
3984 with GNU semantics, with no diagnostics under -pedantic. */
3985 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
3986 pedwarn ("ISO C forbids qualified void function return type");
3987 else if (extra_warnings
3988 && !(VOID_TYPE_P (type)
3989 && type_quals == TYPE_QUAL_VOLATILE))
3990 warning ("type qualifiers ignored on function return type");
3992 type = c_build_qualified_type (type, type_quals);
3994 type_quals = TYPE_UNQUALIFIED;
3996 type = build_function_type (type, arg_types);
3997 declarator = TREE_OPERAND (declarator, 0);
3999 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4000 the formal parameter list of this FUNCTION_TYPE to point to
4001 the FUNCTION_TYPE node itself. */
4006 for (link = last_function_parm_tags;
4008 link = TREE_CHAIN (link))
4009 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4012 else if (TREE_CODE (declarator) == INDIRECT_REF)
4014 /* Merge any constancy or volatility into the target type
4017 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4019 pedwarn ("ISO C forbids qualified function types");
4021 type = c_build_qualified_type (type, type_quals);
4022 type_quals = TYPE_UNQUALIFIED;
4025 type = build_pointer_type (type);
4027 /* Process a list of type modifier keywords
4028 (such as const or volatile) that were given inside the `*'. */
4030 if (TREE_TYPE (declarator))
4038 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4039 typemodlist = TREE_CHAIN (typemodlist))
4041 tree qualifier = TREE_VALUE (typemodlist);
4043 if (C_IS_RESERVED_WORD (qualifier))
4045 if (C_RID_CODE (qualifier) == RID_CONST)
4047 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4049 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4059 error ("invalid type modifier within pointer declarator");
4060 if (constp > 1 && ! flag_isoc99)
4061 pedwarn ("duplicate `const'");
4062 if (volatilep > 1 && ! flag_isoc99)
4063 pedwarn ("duplicate `volatile'");
4064 if (restrictp > 1 && ! flag_isoc99)
4065 pedwarn ("duplicate `restrict'");
4067 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4068 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4069 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4072 declarator = TREE_OPERAND (declarator, 0);
4079 /* Now TYPE has the actual type. */
4081 /* Did array size calculations overflow? */
4083 if (TREE_CODE (type) == ARRAY_TYPE
4084 && COMPLETE_TYPE_P (type)
4085 && TREE_OVERFLOW (TYPE_SIZE (type)))
4087 error ("size of array `%s' is too large", name);
4088 /* If we proceed with the array type as it is, we'll eventually
4089 crash in tree_low_cst(). */
4090 type = error_mark_node;
4093 /* If this is declaring a typedef name, return a TYPE_DECL. */
4095 if (specbits & (1 << (int) RID_TYPEDEF))
4098 /* Note that the grammar rejects storage classes
4099 in typenames, fields or parameters */
4100 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4102 pedwarn ("ISO C forbids qualified function types");
4104 type = c_build_qualified_type (type, type_quals);
4105 decl = build_decl (TYPE_DECL, declarator, type);
4106 if ((specbits & (1 << (int) RID_SIGNED))
4107 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4108 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4109 decl_attributes (&decl, returned_attrs, 0);
4113 /* Detect the case of an array type of unspecified size
4114 which came, as such, direct from a typedef name.
4115 We must copy the type, so that each identifier gets
4116 a distinct type, so that each identifier's size can be
4117 controlled separately by its own initializer. */
4119 if (type != 0 && typedef_type != 0
4120 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4121 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4123 type = build_array_type (TREE_TYPE (type), 0);
4125 C_TYPE_VARIABLE_SIZE (type) = 1;
4128 /* If this is a type name (such as, in a cast or sizeof),
4129 compute the type and return it now. */
4131 if (decl_context == TYPENAME)
4133 /* Note that the grammar rejects storage classes
4134 in typenames, fields or parameters */
4135 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4137 pedwarn ("ISO C forbids const or volatile function types");
4139 type = c_build_qualified_type (type, type_quals);
4140 decl_attributes (&type, returned_attrs, 0);
4144 /* Aside from typedefs and type names (handle above),
4145 `void' at top level (not within pointer)
4146 is allowed only in public variables.
4147 We don't complain about parms either, but that is because
4148 a better error message can be made later. */
4150 if (VOID_TYPE_P (type) && decl_context != PARM
4151 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4152 && ((specbits & (1 << (int) RID_EXTERN))
4153 || (current_scope == global_scope
4155 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4157 error ("variable or field `%s' declared void", name);
4158 type = integer_type_node;
4161 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4162 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4167 if (decl_context == PARM)
4169 tree type_as_written;
4172 /* A parameter declared as an array of T is really a pointer to T.
4173 One declared as a function is really a pointer to a function. */
4175 if (TREE_CODE (type) == ARRAY_TYPE)
4177 /* Transfer const-ness of array into that of type pointed to. */
4178 type = TREE_TYPE (type);
4180 type = c_build_qualified_type (type, type_quals);
4181 type = build_pointer_type (type);
4182 type_quals = TYPE_UNQUALIFIED;
4183 if (array_ptr_quals)
4185 tree new_ptr_quals, new_ptr_attrs;
4187 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4188 /* We don't yet implement attributes in this context. */
4189 if (new_ptr_attrs != NULL_TREE)
4190 warning ("attributes in parameter array declarator ignored");
4195 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4197 tree qualifier = TREE_VALUE (new_ptr_quals);
4199 if (C_IS_RESERVED_WORD (qualifier))
4201 if (C_RID_CODE (qualifier) == RID_CONST)
4203 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4205 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4215 error ("invalid type modifier within array declarator");
4217 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4218 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4219 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4223 else if (TREE_CODE (type) == FUNCTION_TYPE)
4225 if (pedantic && type_quals)
4226 pedwarn ("ISO C forbids qualified function types");
4228 type = c_build_qualified_type (type, type_quals);
4229 type = build_pointer_type (type);
4230 type_quals = TYPE_UNQUALIFIED;
4232 else if (type_quals)
4233 type = c_build_qualified_type (type, type_quals);
4235 type_as_written = type;
4237 decl = build_decl (PARM_DECL, declarator, type);
4239 C_DECL_VARIABLE_SIZE (decl) = 1;
4241 /* Compute the type actually passed in the parmlist,
4242 for the case where there is no prototype.
4243 (For example, shorts and chars are passed as ints.)
4244 When there is a prototype, this is overridden later. */
4246 if (type == error_mark_node)
4247 promoted_type = type;
4249 promoted_type = c_type_promotes_to (type);
4251 DECL_ARG_TYPE (decl) = promoted_type;
4252 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4254 else if (decl_context == FIELD)
4256 /* Structure field. It may not be a function. */
4258 if (TREE_CODE (type) == FUNCTION_TYPE)
4260 error ("field `%s' declared as a function", name);
4261 type = build_pointer_type (type);
4263 else if (TREE_CODE (type) != ERROR_MARK
4264 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4266 error ("field `%s' has incomplete type", name);
4267 type = error_mark_node;
4269 /* Move type qualifiers down to element of an array. */
4270 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4272 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4274 TYPE_DOMAIN (type));
4276 decl = build_decl (FIELD_DECL, declarator, type);
4277 DECL_NONADDRESSABLE_P (decl) = bitfield;
4280 C_DECL_VARIABLE_SIZE (decl) = 1;
4282 else if (TREE_CODE (type) == FUNCTION_TYPE)
4284 /* Every function declaration is "external"
4285 except for those which are inside a function body
4286 in which `auto' is used.
4287 That is a case not specified by ANSI C,
4288 and we use it for forward declarations for nested functions. */
4289 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4290 || current_scope == global_scope);
4292 if (specbits & (1 << (int) RID_AUTO)
4293 && (pedantic || current_scope == global_scope))
4294 pedwarn ("invalid storage class for function `%s'", name);
4295 if (specbits & (1 << (int) RID_REGISTER))
4296 error ("invalid storage class for function `%s'", name);
4297 if (specbits & (1 << (int) RID_THREAD))
4298 error ("invalid storage class for function `%s'", name);
4299 /* Function declaration not at file scope.
4300 Storage classes other than `extern' are not allowed
4301 and `extern' makes no difference. */
4302 if (current_scope != global_scope
4303 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4305 pedwarn ("invalid storage class for function `%s'", name);
4307 decl = build_decl (FUNCTION_DECL, declarator, type);
4308 decl = build_decl_attribute_variant (decl, decl_attr);
4310 DECL_LANG_SPECIFIC (decl)
4311 = ggc_alloc_cleared (sizeof (struct lang_decl));
4313 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4314 pedwarn ("ISO C forbids qualified function types");
4316 /* GNU C interprets a `volatile void' return type to indicate
4317 that the function does not return. */
4318 if ((type_quals & TYPE_QUAL_VOLATILE)
4319 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4320 warning ("`noreturn' function returns non-void value");
4323 DECL_EXTERNAL (decl) = 1;
4324 /* Record absence of global scope for `static' or `auto'. */
4326 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4329 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4331 /* Record presence of `inline', if it is reasonable. */
4332 if (MAIN_NAME_P (declarator))
4335 warning ("cannot inline function `main'");
4339 /* Assume that otherwise the function can be inlined. */
4340 DECL_DECLARED_INLINE_P (decl) = 1;
4342 /* Do not mark bare declarations as DECL_INLINE. Doing so
4343 in the presence of multiple declarations can result in
4344 the abstract origin pointing between the declarations,
4345 which will confuse dwarf2out. */
4348 DECL_INLINE (decl) = 1;
4349 if (specbits & (1 << (int) RID_EXTERN))
4350 current_extern_inline = 1;
4353 /* If -finline-functions, assume it can be inlined. This does
4354 two things: let the function be deferred until it is actually
4355 needed, and let dwarf2 know that the function is inlinable. */
4356 else if (flag_inline_trees == 2 && initialized)
4358 if (!DECL_INLINE (decl))
4359 DID_INLINE_FUNC (decl) = 1;
4360 DECL_INLINE (decl) = 1;
4361 DECL_DECLARED_INLINE_P (decl) = 0;
4366 /* It's a variable. */
4367 /* An uninitialized decl with `extern' is a reference. */
4368 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4370 /* Move type qualifiers down to element of an array. */
4371 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4373 int saved_align = TYPE_ALIGN(type);
4374 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4376 TYPE_DOMAIN (type));
4377 TYPE_ALIGN (type) = saved_align;
4379 else if (type_quals)
4380 type = c_build_qualified_type (type, type_quals);
4382 /* It is invalid to create an `extern' declaration for a
4383 variable if there is a global declaration that is
4385 if (extern_ref && current_scope != global_scope)
4389 global_decl = identifier_global_value (declarator);
4391 && TREE_CODE (global_decl) == VAR_DECL
4392 && !TREE_PUBLIC (global_decl))
4393 error ("variable previously declared `static' redeclared "
4397 decl = build_decl (VAR_DECL, declarator, type);
4399 C_DECL_VARIABLE_SIZE (decl) = 1;
4402 pedwarn ("%Hvariable '%D' declared `inline'",
4403 &DECL_SOURCE_LOCATION (decl), decl);
4405 DECL_EXTERNAL (decl) = extern_ref;
4407 /* At file scope, the presence of a `static' or `register' storage
4408 class specifier, or the absence of all storage class specifiers
4409 makes this declaration a definition (perhaps tentative). Also,
4410 the absence of both `static' and `register' makes it public. */
4411 if (current_scope == global_scope)
4413 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4414 | (1 << (int) RID_REGISTER)));
4415 TREE_STATIC (decl) = !extern_ref;
4417 /* Not at file scope, only `static' makes a static definition. */
4420 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4421 TREE_PUBLIC (decl) = extern_ref;
4424 if (specbits & 1 << (int) RID_THREAD)
4426 if (targetm.have_tls)
4427 DECL_THREAD_LOCAL (decl) = 1;
4429 /* A mere warning is sure to result in improper semantics
4430 at runtime. Don't bother to allow this to compile. */
4431 error ("thread-local storage not supported for this target");
4435 /* Record `register' declaration for warnings on &
4436 and in case doing stupid register allocation. */
4438 if (specbits & (1 << (int) RID_REGISTER))
4439 DECL_REGISTER (decl) = 1;
4441 /* Record constancy and volatility. */
4442 c_apply_type_quals_to_decl (type_quals, decl);
4444 /* If a type has volatile components, it should be stored in memory.
4445 Otherwise, the fact that those components are volatile
4446 will be ignored, and would even crash the compiler. */
4447 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4448 c_mark_addressable (decl);
4450 #ifdef ENABLE_CHECKING
4451 /* This is the earliest point at which we might know the assembler
4452 name of a variable. Thus, if it's known before this, die horribly. */
4453 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4457 decl_attributes (&decl, returned_attrs, 0);
4463 /* Decode the parameter-list info for a function type or function definition.
4464 The argument is the value returned by `get_parm_info' (or made in parse.y
4465 if there is an identifier list instead of a parameter decl list).
4466 These two functions are separate because when a function returns
4467 or receives functions then each is called multiple times but the order
4468 of calls is different. The last call to `grokparms' is always the one
4469 that contains the formal parameter names of a function definition.
4471 Store in `last_function_parms' a chain of the decls of parms.
4472 Also store in `last_function_parm_tags' a chain of the struct, union,
4473 and enum tags declared among the parms.
4475 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4477 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4478 a mere declaration. A nonempty identifier-list gets an error message
4479 when FUNCDEF_FLAG is zero. */
4482 grokparms (tree parms_info, int funcdef_flag)
4484 tree first_parm = TREE_CHAIN (parms_info);
4486 last_function_parms = TREE_PURPOSE (parms_info);
4487 last_function_parm_tags = TREE_VALUE (parms_info);
4489 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4490 && !in_system_header)
4491 warning ("function declaration isn't a prototype");
4494 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4497 pedwarn ("parameter names (without types) in function declaration");
4499 last_function_parms = first_parm;
4506 /* If the arg types are incomplete in a declaration,
4507 they must include undefined tags.
4508 These tags can never be defined in the scope of the declaration,
4509 so the types can never be completed,
4510 and no call can be compiled successfully. */
4511 for (parm = last_function_parms, typelt = first_parm;
4513 parm = TREE_CHAIN (parm))
4514 /* Skip over any enumeration constants declared here. */
4515 if (TREE_CODE (parm) == PARM_DECL)
4517 /* Barf if the parameter itself has an incomplete type. */
4518 tree type = TREE_VALUE (typelt);
4519 if (type == error_mark_node)
4521 if (!COMPLETE_TYPE_P (type))
4523 if (funcdef_flag && DECL_NAME (parm) != 0)
4524 error ("parameter `%s' has incomplete type",
4525 IDENTIFIER_POINTER (DECL_NAME (parm)));
4527 warning ("parameter has incomplete type");
4530 TREE_VALUE (typelt) = error_mark_node;
4531 TREE_TYPE (parm) = error_mark_node;
4534 typelt = TREE_CHAIN (typelt);
4541 /* Return a tree_list node with info on a parameter list just parsed.
4542 The TREE_PURPOSE is a chain of decls of those parms.
4543 The TREE_VALUE is a list of structure, union and enum tags defined.
4544 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4545 This tree_list node is later fed to `grokparms'.
4547 VOID_AT_END nonzero means append `void' to the end of the type-list.
4548 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4551 get_parm_info (int void_at_end)
4556 tree tags = gettags ();
4557 tree parms = getdecls ();
4559 tree order = current_scope->parm_order;
4561 /* Just `void' (and no ellipsis) is special. There are really no parms.
4562 But if the `void' is qualified (by `const' or `volatile') or has a
4563 storage class specifier (`register'), then the behavior is undefined;
4564 by not counting it as the special case of `void' we will cause an
4565 error later. Typedefs for `void' are OK (see DR#157). */
4566 if (void_at_end && parms != 0
4567 && TREE_CHAIN (parms) == 0
4568 && VOID_TYPE_P (TREE_TYPE (parms))
4569 && ! TREE_THIS_VOLATILE (parms)
4570 && ! TREE_READONLY (parms)
4571 && ! DECL_REGISTER (parms)
4572 && DECL_NAME (parms) == 0)
4575 storedecls (NULL_TREE);
4576 return tree_cons (NULL_TREE, NULL_TREE,
4577 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4580 /* Extract enumerator values and other non-parms declared with the parms.
4581 Likewise any forward parm decls that didn't have real parm decls. */
4582 for (decl = parms; decl;)
4584 tree next = TREE_CHAIN (decl);
4586 if (TREE_CODE (decl) != PARM_DECL)
4588 TREE_CHAIN (decl) = new_parms;
4591 else if (TREE_ASM_WRITTEN (decl))
4593 error ("%Hparameter '%D' has just a forward declaration",
4594 &DECL_SOURCE_LOCATION (decl), decl);
4595 TREE_CHAIN (decl) = new_parms;
4601 /* Put the parm decls back in the order they were in in the parm list. */
4602 for (t = order; t; t = TREE_CHAIN (t))
4605 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4607 TREE_CHAIN (TREE_VALUE (t)) = 0;
4610 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4613 /* Store the parmlist in the scope structure since the old one
4614 is no longer a valid list. (We have changed the chain pointers.) */
4615 storedecls (new_parms);
4617 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4618 /* There may also be declarations for enumerators if an enumeration
4619 type is declared among the parms. Ignore them here. */
4620 if (TREE_CODE (decl) == PARM_DECL)
4622 /* Since there is a prototype,
4623 args are passed in their declared types. */
4624 tree type = TREE_TYPE (decl);
4625 DECL_ARG_TYPE (decl) = type;
4626 if (PROMOTE_PROTOTYPES
4627 && INTEGRAL_TYPE_P (type)
4628 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4629 DECL_ARG_TYPE (decl) = integer_type_node;
4631 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4632 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
4633 && DECL_NAME (decl) == 0)
4635 error ("`void' in parameter list must be the entire list");
4641 return tree_cons (new_parms, tags,
4642 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
4644 return tree_cons (new_parms, tags, nreverse (types));
4647 /* At end of parameter list, warn about any struct, union or enum tags
4648 defined within. Do so because these types cannot ever become complete. */
4651 parmlist_tags_warning (void)
4656 for (elt = current_scope->tags; elt; elt = TREE_CHAIN (elt))
4658 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4659 /* An anonymous union parm type is meaningful as a GNU extension.
4660 So don't warn for that. */
4661 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
4663 if (TREE_PURPOSE (elt) != 0)
4665 if (code == RECORD_TYPE)
4666 warning ("`struct %s' declared inside parameter list",
4667 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4668 else if (code == UNION_TYPE)
4669 warning ("`union %s' declared inside parameter list",
4670 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4672 warning ("`enum %s' declared inside parameter list",
4673 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4677 /* For translation these need to be separate warnings */
4678 if (code == RECORD_TYPE)
4679 warning ("anonymous struct declared inside parameter list");
4680 else if (code == UNION_TYPE)
4681 warning ("anonymous union declared inside parameter list");
4683 warning ("anonymous enum declared inside parameter list");
4687 warning ("its scope is only this definition or declaration, which is probably not what you want");
4693 /* Get the struct, enum or union (CODE says which) with tag NAME.
4694 Define the tag as a forward-reference if it is not defined. */
4697 xref_tag (enum tree_code code, tree name)
4699 /* If a cross reference is requested, look up the type
4700 already defined for this tag and return it. */
4702 tree ref = lookup_tag (code, name, 0);
4703 /* If this is the right type of tag, return what we found.
4704 (This reference will be shadowed by shadow_tag later if appropriate.)
4705 If this is the wrong type of tag, do not return it. If it was the
4706 wrong type in the same scope, we will have had an error
4707 message already; if in a different scope and declaring
4708 a name, pending_xref_error will give an error message; but if in a
4709 different scope and not declaring a name, this tag should
4710 shadow the previous declaration of a different type of tag, and
4711 this would not work properly if we return the reference found.
4712 (For example, with "struct foo" in an outer scope, "union foo;"
4713 must shadow that tag with a new one of union type.) */
4714 if (ref && TREE_CODE (ref) == code)
4717 /* If no such tag is yet defined, create a forward-reference node
4718 and record it as the "definition".
4719 When a real declaration of this type is found,
4720 the forward-reference will be altered into a real type. */
4722 ref = make_node (code);
4723 if (code == ENUMERAL_TYPE)
4725 /* Give the type a default layout like unsigned int
4726 to avoid crashing if it does not get defined. */
4727 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4728 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4729 TYPE_USER_ALIGN (ref) = 0;
4730 TREE_UNSIGNED (ref) = 1;
4731 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4732 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4733 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4736 pushtag (name, ref);
4741 /* Make sure that the tag NAME is defined *in the current scope*
4742 at least as a forward reference.
4743 CODE says which kind of tag NAME ought to be. */
4746 start_struct (enum tree_code code, tree name)
4748 /* If there is already a tag defined at this scope
4749 (as a forward reference), just return it. */
4754 ref = lookup_tag (code, name, 1);
4755 if (ref && TREE_CODE (ref) == code)
4757 if (TYPE_FIELDS (ref))
4759 if (code == UNION_TYPE)
4760 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4762 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4767 /* Otherwise create a forward-reference just so the tag is in scope. */
4769 ref = make_node (code);
4770 pushtag (name, ref);
4773 C_TYPE_BEING_DEFINED (ref) = 1;
4774 TYPE_PACKED (ref) = flag_pack_struct;
4778 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4779 of a structure component, returning a FIELD_DECL node.
4780 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4782 This is done during the parsing of the struct declaration.
4783 The FIELD_DECL nodes are chained together and the lot of them
4784 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4787 grokfield (tree declarator, tree declspecs, tree width)
4791 if (declarator == NULL_TREE && width == NULL_TREE)
4793 /* This is an unnamed decl.
4795 If we have something of the form "union { list } ;" then this
4796 is the anonymous union extension. Similarly for struct.
4798 If this is something of the form "struct foo;", then
4799 If MS extensions are enabled, this is handled as an
4801 Otherwise this is a forward declaration of a structure tag.
4803 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4804 If MS extensions are enabled and foo names a structure, then
4805 again this is an anonymous struct.
4806 Otherwise this is an error.
4808 Oh what a horrid tangled web we weave. I wonder if MS consciously
4809 took this from Plan 9 or if it was an accident of implementation
4810 that took root before someone noticed the bug... */
4812 tree type = TREE_VALUE (declspecs);
4814 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4815 type = TREE_TYPE (type);
4816 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4818 if (flag_ms_extensions)
4821 goto warn_unnamed_field;
4822 else if (TYPE_NAME (type) == NULL)
4825 goto warn_unnamed_field;
4830 warning ("declaration does not declare anything");
4835 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4837 finish_decl (value, NULL_TREE, NULL_TREE);
4838 DECL_INITIAL (value) = width;
4840 if (c_dialect_objc ())
4841 objc_check_decl (value);
4845 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4846 the list such that this does not present a problem later. */
4849 detect_field_duplicates (tree fieldlist)
4854 /* First, see if there are more than "a few" fields.
4855 This is trivially true if there are zero or one fields. */
4858 x = TREE_CHAIN (fieldlist);
4864 } while (timeout > 0 && x);
4866 /* If there were "few" fields, avoid the overhead of allocating
4867 a hash table. Instead just do the nested traversal thing. */
4870 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4873 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4874 if (DECL_NAME (y) == DECL_NAME (x))
4876 error ("%Hduplicate member '%D'",
4877 &DECL_SOURCE_LOCATION (x), x);
4878 DECL_NAME (x) = NULL_TREE;
4884 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4887 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4888 if ((y = DECL_NAME (x)) != 0)
4890 slot = htab_find_slot (htab, y, INSERT);
4893 error ("%Hduplicate member '%D'",
4894 &DECL_SOURCE_LOCATION (x), x);
4895 DECL_NAME (x) = NULL_TREE;
4904 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4905 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4906 ATTRIBUTES are attributes to be applied to the structure. */
4909 finish_struct (tree t, tree fieldlist, tree attributes)
4912 int toplevel = global_scope == current_scope;
4913 int saw_named_field;
4915 /* If this type was previously laid out as a forward reference,
4916 make sure we lay it out again. */
4920 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4922 /* Nameless union parm types are useful as GCC extension. */
4923 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4924 /* Otherwise, warn about any struct or union def. in parmlist. */
4925 if (in_parm_level_p ())
4928 pedwarn ("%s defined inside parms",
4929 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4931 warning ("%s defined inside parms",
4932 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4937 for (x = fieldlist; x; x = TREE_CHAIN (x))
4938 if (DECL_NAME (x) != 0)
4942 pedwarn ("%s has no %s",
4943 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4944 fieldlist ? _("named members") : _("members"));
4947 /* Install struct as DECL_CONTEXT of each field decl.
4948 Also process specified field sizes,m which is found in the DECL_INITIAL.
4949 Store 0 there, except for ": 0" fields (so we can find them
4950 and delete them, below). */
4952 saw_named_field = 0;
4953 for (x = fieldlist; x; x = TREE_CHAIN (x))
4955 DECL_CONTEXT (x) = t;
4956 DECL_PACKED (x) |= TYPE_PACKED (t);
4958 /* If any field is const, the structure type is pseudo-const. */
4959 if (TREE_READONLY (x))
4960 C_TYPE_FIELDS_READONLY (t) = 1;
4963 /* A field that is pseudo-const makes the structure likewise. */
4964 tree t1 = TREE_TYPE (x);
4965 while (TREE_CODE (t1) == ARRAY_TYPE)
4966 t1 = TREE_TYPE (t1);
4967 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4968 && C_TYPE_FIELDS_READONLY (t1))
4969 C_TYPE_FIELDS_READONLY (t) = 1;
4972 /* Any field that is volatile means variables of this type must be
4973 treated in some ways as volatile. */
4974 if (TREE_THIS_VOLATILE (x))
4975 C_TYPE_FIELDS_VOLATILE (t) = 1;
4977 /* Any field of nominal variable size implies structure is too. */
4978 if (C_DECL_VARIABLE_SIZE (x))
4979 C_TYPE_VARIABLE_SIZE (t) = 1;
4981 /* Detect invalid nested redefinition. */
4982 if (TREE_TYPE (x) == t)
4983 error ("nested redefinition of `%s'",
4984 IDENTIFIER_POINTER (TYPE_NAME (t)));
4986 /* Detect invalid bit-field size. */
4987 if (DECL_INITIAL (x))
4988 STRIP_NOPS (DECL_INITIAL (x));
4989 if (DECL_INITIAL (x))
4991 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
4992 constant_expression_warning (DECL_INITIAL (x));
4995 error ("%Hbit-field '%D' width not an integer constant",
4996 &DECL_SOURCE_LOCATION (x), x);
4997 DECL_INITIAL (x) = NULL;
5001 /* Detect invalid bit-field type. */
5002 if (DECL_INITIAL (x)
5003 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5004 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5005 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5007 error ("%Hbit-field '%D' has invalid type",
5008 &DECL_SOURCE_LOCATION (x), x);
5009 DECL_INITIAL (x) = NULL;
5012 if (DECL_INITIAL (x) && pedantic
5013 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5014 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5015 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != boolean_type_node
5016 /* Accept an enum that's equivalent to int or unsigned int. */
5017 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5018 && (TYPE_PRECISION (TREE_TYPE (x))
5019 == TYPE_PRECISION (integer_type_node))))
5020 pedwarn ("%Hbit-field '%D' type invalid in ISO C",
5021 &DECL_SOURCE_LOCATION (x), x);
5023 /* Detect and ignore out of range field width and process valid
5025 if (DECL_INITIAL (x))
5028 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == boolean_type_node
5029 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5031 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5032 error ("%Hnegative width in bit-field '%D'",
5033 &DECL_SOURCE_LOCATION (x), x);
5034 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5035 pedwarn ("%Hwidth of '%D' exceeds its type",
5036 &DECL_SOURCE_LOCATION (x), x);
5037 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5038 error ("%Hzero width for bit-field '%D'",
5039 &DECL_SOURCE_LOCATION (x), x);
5042 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5043 unsigned HOST_WIDE_INT width
5044 = tree_low_cst (DECL_INITIAL (x), 1);
5046 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5047 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5048 TREE_UNSIGNED (TREE_TYPE (x)))
5050 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5051 TREE_UNSIGNED (TREE_TYPE (x))))))
5052 warning ("%H'%D' is narrower than values of its type",
5053 &DECL_SOURCE_LOCATION (x), x);
5055 DECL_SIZE (x) = bitsize_int (width);
5056 DECL_BIT_FIELD (x) = 1;
5057 SET_DECL_C_BIT_FIELD (x);
5061 DECL_INITIAL (x) = 0;
5063 /* Detect flexible array member in an invalid context. */
5064 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5065 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5066 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5067 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5069 if (TREE_CODE (t) == UNION_TYPE)
5070 error ("%Hflexible array member in union",
5071 &DECL_SOURCE_LOCATION (x));
5072 else if (TREE_CHAIN (x) != NULL_TREE)
5073 error ("%Hflexible array member not at end of struct",
5074 &DECL_SOURCE_LOCATION (x));
5075 else if (! saw_named_field)
5076 error ("%Hflexible array member in otherwise empty struct",
5077 &DECL_SOURCE_LOCATION (x));
5080 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5081 && flexible_array_type_p (TREE_TYPE (x)))
5082 pedwarn ("%Hinvalid use of structure with flexible array member",
5083 &DECL_SOURCE_LOCATION (x));
5086 saw_named_field = 1;
5089 detect_field_duplicates (fieldlist);
5091 /* Now we have the nearly final fieldlist. Record it,
5092 then lay out the structure or union (including the fields). */
5094 TYPE_FIELDS (t) = fieldlist;
5098 /* Delete all zero-width bit-fields from the fieldlist */
5100 tree *fieldlistp = &fieldlist;
5102 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5103 *fieldlistp = TREE_CHAIN (*fieldlistp);
5105 fieldlistp = &TREE_CHAIN (*fieldlistp);
5108 /* Now we have the truly final field list.
5109 Store it in this type and in the variants. */
5111 TYPE_FIELDS (t) = fieldlist;
5113 /* If there are lots of fields, sort so we can look through them fast.
5114 We arbitrarily consider 16 or more elts to be "a lot". */
5119 for (x = fieldlist; x; x = TREE_CHAIN (x))
5121 if (len > 15 || DECL_NAME (x) == NULL)
5129 struct lang_type *space;
5130 struct sorted_fields_type *space2;
5132 len += list_length (x);
5134 /* Use the same allocation policy here that make_node uses, to
5135 ensure that this lives as long as the rest of the struct decl.
5136 All decls in an inline function need to be saved. */
5138 space = ggc_alloc (sizeof (struct lang_type));
5139 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5143 field_array = &space2->elts[0];
5144 for (x = fieldlist; x; x = TREE_CHAIN (x))
5146 field_array[len++] = x;
5148 /* If there is anonymous struct or union, break out of the loop. */
5149 if (DECL_NAME (x) == NULL)
5152 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5155 TYPE_LANG_SPECIFIC (t) = space;
5156 TYPE_LANG_SPECIFIC (t)->s->len = len;
5157 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5158 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5163 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5165 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5166 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5167 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5168 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5171 /* If this was supposed to be a transparent union, but we can't
5172 make it one, warn and turn off the flag. */
5173 if (TREE_CODE (t) == UNION_TYPE
5174 && TYPE_TRANSPARENT_UNION (t)
5175 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5177 TYPE_TRANSPARENT_UNION (t) = 0;
5178 warning ("union cannot be made transparent");
5181 /* If this structure or union completes the type of any previous
5182 variable declaration, lay it out and output its rtl. */
5184 if (current_scope->incomplete_list != NULL_TREE)
5186 tree prev = NULL_TREE;
5188 for (x = current_scope->incomplete_list; x; x = TREE_CHAIN (x))
5190 tree decl = TREE_VALUE (x);
5192 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5193 && TREE_CODE (decl) != TYPE_DECL)
5195 layout_decl (decl, 0);
5196 /* This is a no-op in c-lang.c or something real in objc-act.c. */
5197 if (c_dialect_objc ())
5198 objc_check_decl (decl);
5199 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5202 /* Unlink X from the incomplete list. */
5204 TREE_CHAIN (prev) = TREE_CHAIN (x);
5206 current_scope->incomplete_list = TREE_CHAIN (x);
5208 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5209 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5211 tree element = TREE_TYPE (decl);
5212 while (TREE_CODE (element) == ARRAY_TYPE)
5213 element = TREE_TYPE (element);
5216 layout_array_type (TREE_TYPE (decl));
5217 if (TREE_CODE (decl) != TYPE_DECL)
5219 layout_decl (decl, 0);
5220 if (c_dialect_objc ())
5221 objc_check_decl (decl);
5222 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5226 /* Unlink X from the incomplete list. */
5228 TREE_CHAIN (prev) = TREE_CHAIN (x);
5230 current_scope->incomplete_list = TREE_CHAIN (x);
5236 /* Finish debugging output for this type. */
5237 rest_of_type_compilation (t, toplevel);
5242 /* Lay out the type T, and its element type, and so on. */
5245 layout_array_type (tree t)
5247 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5248 layout_array_type (TREE_TYPE (t));
5252 /* Begin compiling the definition of an enumeration type.
5253 NAME is its name (or null if anonymous).
5254 Returns the type object, as yet incomplete.
5255 Also records info about it so that build_enumerator
5256 may be used to declare the individual values as they are read. */
5259 start_enum (tree name)
5263 /* If this is the real definition for a previous forward reference,
5264 fill in the contents in the same object that used to be the
5265 forward reference. */
5268 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5270 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5272 enumtype = make_node (ENUMERAL_TYPE);
5273 pushtag (name, enumtype);
5276 C_TYPE_BEING_DEFINED (enumtype) = 1;
5278 if (TYPE_VALUES (enumtype) != 0)
5280 /* This enum is a named one that has been declared already. */
5281 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5283 /* Completely replace its old definition.
5284 The old enumerators remain defined, however. */
5285 TYPE_VALUES (enumtype) = 0;
5288 enum_next_value = integer_zero_node;
5291 if (flag_short_enums)
5292 TYPE_PACKED (enumtype) = 1;
5297 /* After processing and defining all the values of an enumeration type,
5298 install their decls in the enumeration type and finish it off.
5299 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5300 and ATTRIBUTES are the specified attributes.
5301 Returns ENUMTYPE. */
5304 finish_enum (tree enumtype, tree values, tree attributes)
5307 tree minnode = 0, maxnode = 0, enum_value_type;
5308 int precision, unsign;
5309 int toplevel = (global_scope == current_scope);
5311 if (in_parm_level_p ())
5312 warning ("enum defined inside parms");
5314 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5316 /* Calculate the maximum value of any enumerator in this type. */
5318 if (values == error_mark_node)
5319 minnode = maxnode = integer_zero_node;
5322 minnode = maxnode = TREE_VALUE (values);
5323 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5325 tree value = TREE_VALUE (pair);
5326 if (tree_int_cst_lt (maxnode, value))
5328 if (tree_int_cst_lt (value, minnode))
5333 /* Construct the final type of this enumeration. It is the same
5334 as one of the integral types - the narrowest one that fits, except
5335 that normally we only go as narrow as int - and signed iff any of
5336 the values are negative. */
5337 unsign = (tree_int_cst_sgn (minnode) >= 0);
5338 precision = MAX (min_precision (minnode, unsign),
5339 min_precision (maxnode, unsign));
5340 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5342 tree narrowest = c_common_type_for_size (precision, unsign);
5345 warning ("enumeration values exceed range of largest integer");
5346 narrowest = long_long_integer_type_node;
5349 precision = TYPE_PRECISION (narrowest);
5352 precision = TYPE_PRECISION (integer_type_node);
5354 if (precision == TYPE_PRECISION (integer_type_node))
5355 enum_value_type = c_common_type_for_size (precision, 0);
5357 enum_value_type = enumtype;
5359 TYPE_MIN_VALUE (enumtype) = minnode;
5360 TYPE_MAX_VALUE (enumtype) = maxnode;
5361 TYPE_PRECISION (enumtype) = precision;
5362 TREE_UNSIGNED (enumtype) = unsign;
5363 TYPE_SIZE (enumtype) = 0;
5364 layout_type (enumtype);
5366 if (values != error_mark_node)
5368 /* Change the type of the enumerators to be the enum type. We
5369 need to do this irrespective of the size of the enum, for
5370 proper type checking. Replace the DECL_INITIALs of the
5371 enumerators, and the value slots of the list, with copies
5372 that have the enum type; they cannot be modified in place
5373 because they may be shared (e.g. integer_zero_node) Finally,
5374 change the purpose slots to point to the names of the decls. */
5375 for (pair = values; pair; pair = TREE_CHAIN (pair))
5377 tree enu = TREE_PURPOSE (pair);
5379 TREE_TYPE (enu) = enumtype;
5381 /* The ISO C Standard mandates enumerators to have type int,
5382 even though the underlying type of an enum type is
5383 unspecified. Here we convert any enumerators that fit in
5384 an int to type int, to avoid promotions to unsigned types
5385 when comparing integers with enumerators that fit in the
5386 int range. When -pedantic is given, build_enumerator()
5387 would have already taken care of those that don't fit. */
5388 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5389 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5391 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5393 TREE_PURPOSE (pair) = DECL_NAME (enu);
5394 TREE_VALUE (pair) = DECL_INITIAL (enu);
5397 TYPE_VALUES (enumtype) = values;
5400 /* Fix up all variant types of this enum type. */
5401 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5403 if (tem == enumtype)
5405 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5406 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5407 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5408 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5409 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5410 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5411 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5412 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5413 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5414 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5417 /* Finish debugging output for this type. */
5418 rest_of_type_compilation (enumtype, toplevel);
5423 /* Build and install a CONST_DECL for one value of the
5424 current enumeration type (one that was begun with start_enum).
5425 Return a tree-list containing the CONST_DECL and its value.
5426 Assignment of sequential values by default is handled here. */
5429 build_enumerator (tree name, tree value)
5433 /* Validate and default VALUE. */
5435 /* Remove no-op casts from the value. */
5437 STRIP_TYPE_NOPS (value);
5441 if (TREE_CODE (value) == INTEGER_CST)
5443 value = default_conversion (value);
5444 constant_expression_warning (value);
5448 error ("enumerator value for `%s' not integer constant",
5449 IDENTIFIER_POINTER (name));
5454 /* Default based on previous value. */
5455 /* It should no longer be possible to have NON_LVALUE_EXPR
5459 value = enum_next_value;
5461 error ("overflow in enumeration values");
5464 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5466 pedwarn ("ISO C restricts enumerator values to range of `int'");
5467 value = convert (integer_type_node, value);
5470 /* Set basis for default for next value. */
5471 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5472 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5474 /* Now create a declaration for the enum value name. */
5476 type = TREE_TYPE (value);
5477 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5478 TYPE_PRECISION (integer_type_node)),
5479 (TYPE_PRECISION (type)
5480 >= TYPE_PRECISION (integer_type_node)
5481 && TREE_UNSIGNED (type)));
5483 decl = build_decl (CONST_DECL, name, type);
5484 DECL_INITIAL (decl) = convert (type, value);
5487 return tree_cons (decl, value, NULL_TREE);
5491 /* Create the FUNCTION_DECL for a function definition.
5492 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5493 the declaration; they describe the function's name and the type it returns,
5494 but twisted together in a fashion that parallels the syntax of C.
5496 This function creates a binding context for the function body
5497 as well as setting up the FUNCTION_DECL in current_function_decl.
5499 Returns 1 on success. If the DECLARATOR is not suitable for a function
5500 (it defines a datum instead), we return 0, which tells
5501 yyparse to report a parse error. */
5504 start_function (tree declspecs, tree declarator, tree attributes)
5506 tree decl1, old_decl;
5508 int old_immediate_size_expand = immediate_size_expand;
5510 current_function_returns_value = 0; /* Assume, until we see it does. */
5511 current_function_returns_null = 0;
5512 current_function_returns_abnormally = 0;
5513 warn_about_return_type = 0;
5514 current_extern_inline = 0;
5516 /* Don't expand any sizes in the return type of the function. */
5517 immediate_size_expand = 0;
5519 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5521 /* If the declarator is not suitable for a function definition,
5522 cause a syntax error. */
5525 immediate_size_expand = old_immediate_size_expand;
5529 decl_attributes (&decl1, attributes, 0);
5531 if (DECL_DECLARED_INLINE_P (decl1)
5532 && DECL_UNINLINABLE (decl1)
5533 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5534 warning ("%Hinline function '%D' given attribute noinline",
5535 &DECL_SOURCE_LOCATION (decl1), decl1);
5537 announce_function (decl1);
5539 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5541 error ("return type is an incomplete type");
5542 /* Make it return void instead. */
5544 = build_function_type (void_type_node,
5545 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5548 if (warn_about_return_type)
5549 pedwarn_c99 ("return type defaults to `int'");
5551 /* Save the parm names or decls from this function's declarator
5552 where store_parm_decls will find them. */
5553 current_function_parms = last_function_parms;
5554 current_function_parm_tags = last_function_parm_tags;
5556 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5557 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5558 DECL_INITIAL (decl1) = error_mark_node;
5560 /* If this definition isn't a prototype and we had a prototype declaration
5561 before, copy the arg type info from that prototype.
5562 But not if what we had before was a builtin function. */
5563 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5564 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5565 && !DECL_BUILT_IN (old_decl)
5566 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5567 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5568 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5570 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5571 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5574 /* Optionally warn of old-fashioned def with no previous prototype. */
5575 if (warn_strict_prototypes
5576 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5577 && C_DECL_ISNT_PROTOTYPE (old_decl))
5578 warning ("function declaration isn't a prototype");
5579 /* Optionally warn of any global def with no previous prototype. */
5580 else if (warn_missing_prototypes
5581 && TREE_PUBLIC (decl1)
5582 && ! MAIN_NAME_P (DECL_NAME (decl1))
5583 && C_DECL_ISNT_PROTOTYPE (old_decl))
5584 warning ("%Hno previous prototype for '%D'",
5585 &DECL_SOURCE_LOCATION (decl1), decl1);
5586 /* Optionally warn of any def with no previous prototype
5587 if the function has already been used. */
5588 else if (warn_missing_prototypes
5589 && old_decl != 0 && TREE_USED (old_decl)
5590 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5591 warning ("%H'%D' was used with no prototype before its definition",
5592 &DECL_SOURCE_LOCATION (decl1), decl1);
5593 /* Optionally warn of any global def with no previous declaration. */
5594 else if (warn_missing_declarations
5595 && TREE_PUBLIC (decl1)
5597 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5598 warning ("%Hno previous declaration for '%D'",
5599 &DECL_SOURCE_LOCATION (decl1), decl1);
5600 /* Optionally warn of any def with no previous declaration
5601 if the function has already been used. */
5602 else if (warn_missing_declarations
5603 && old_decl != 0 && TREE_USED (old_decl)
5604 && C_DECL_IMPLICIT (old_decl))
5605 warning ("%H`%D' was used with no declaration before its definition",
5606 &DECL_SOURCE_LOCATION (decl1), decl1);
5608 /* This is a definition, not a reference.
5609 So normally clear DECL_EXTERNAL.
5610 However, `extern inline' acts like a declaration
5611 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5612 DECL_EXTERNAL (decl1) = current_extern_inline;
5614 /* This function exists in static storage.
5615 (This does not mean `static' in the C sense!) */
5616 TREE_STATIC (decl1) = 1;
5618 /* A nested function is not global. */
5619 if (current_function_decl != 0)
5620 TREE_PUBLIC (decl1) = 0;
5622 #ifdef ENABLE_CHECKING
5623 /* This is the earliest point at which we might know the assembler
5624 name of the function. Thus, if it's set before this, die horribly. */
5625 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5629 /* If #pragma weak was used, mark the decl weak now. */
5630 if (current_scope == global_scope)
5631 maybe_apply_pragma_weak (decl1);
5633 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5634 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5638 const location_t *locus = &DECL_SOURCE_LOCATION (decl1);
5640 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5641 != integer_type_node)
5642 pedwarn ("%Hreturn type of '%D' is not `int'", locus, decl1);
5644 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5645 args = TREE_CHAIN (args))
5647 tree type = args ? TREE_VALUE (args) : 0;
5649 if (type == void_type_node)
5656 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5657 pedwarn ("%Hfirst argument of '%D' should be `int'",
5662 if (TREE_CODE (type) != POINTER_TYPE
5663 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5664 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5666 pedwarn ("%Hsecond argument of '%D' should be 'char **'",
5671 if (TREE_CODE (type) != POINTER_TYPE
5672 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5673 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5675 pedwarn ("%Hthird argument of '%D' should probably be "
5676 "'char **'", locus, decl1);
5681 /* It is intentional that this message does not mention the third
5682 argument because it's only mentioned in an appendix of the
5684 if (argct > 0 && (argct < 2 || argct > 3))
5685 pedwarn ("%H'%D' takes only zero or two arguments", locus, decl1);
5687 if (! TREE_PUBLIC (decl1))
5688 pedwarn ("%H'%D' is normally a non-static function", locus, decl1);
5691 /* Record the decl so that the function name is defined.
5692 If we already have a decl for this name, and it is a FUNCTION_DECL,
5693 use the old decl. */
5695 current_function_decl = pushdecl (decl1);
5698 declare_parm_level ();
5700 make_decl_rtl (current_function_decl, NULL);
5702 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5703 /* Promote the value to int before returning it. */
5704 if (c_promoting_integer_type_p (restype))
5706 /* It retains unsignedness if not really getting wider. */
5707 if (TREE_UNSIGNED (restype)
5708 && (TYPE_PRECISION (restype)
5709 == TYPE_PRECISION (integer_type_node)))
5710 restype = unsigned_type_node;
5712 restype = integer_type_node;
5714 DECL_RESULT (current_function_decl)
5715 = build_decl (RESULT_DECL, NULL_TREE, restype);
5717 /* If this fcn was already referenced via a block-scope `extern' decl
5718 (or an implicit decl), propagate certain information about the usage. */
5719 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5720 TREE_ADDRESSABLE (current_function_decl) = 1;
5722 immediate_size_expand = old_immediate_size_expand;
5724 start_fname_decls ();
5729 /* Subroutine of store_parm_decls which handles new-style function
5730 definitions (prototype format). The parms already have decls, so we
5731 need only record them as in effect and complain if any redundant
5732 old-style parm decls were written. */
5734 store_parm_decls_newstyle (void)
5737 tree fndecl = current_function_decl;
5738 tree parms = current_function_parms;
5739 tree tags = current_function_parm_tags;
5741 /* This is anything which appeared in current_function_parms that
5742 wasn't a PARM_DECL. */
5745 if (current_scope->names || current_scope->tags)
5747 error ("%Hold-style parameter declarations in prototyped "
5748 "function definition", &DECL_SOURCE_LOCATION (fndecl));
5750 /* Get rid of the old-style declarations. */
5755 /* Now make all the parameter declarations visible in the function body. */
5756 parms = nreverse (parms);
5757 for (decl = parms; decl; decl = next)
5759 next = TREE_CHAIN (decl);
5760 if (TREE_CODE (decl) != PARM_DECL)
5762 /* If we find an enum constant or a type tag,
5763 put it aside for the moment. */
5764 TREE_CHAIN (decl) = 0;
5765 nonparms = chainon (nonparms, decl);
5769 if (DECL_NAME (decl) == 0)
5770 error ("%Hparameter name omitted", &DECL_SOURCE_LOCATION (decl));
5775 /* Record the parameter list in the function declaration. */
5776 DECL_ARGUMENTS (fndecl) = getdecls ();
5778 /* Now make all the ancillary declarations visible, likewise. */
5779 for (decl = nonparms; decl; decl = TREE_CHAIN (decl))
5780 if (DECL_NAME (decl) != 0
5781 && TYPE_MAIN_VARIANT (TREE_TYPE (decl)) != void_type_node)
5784 /* And all the tag declarations. */
5788 /* Subroutine of store_parm_decls which handles old-style function
5789 definitions (separate parameter list and declarations). */
5792 store_parm_decls_oldstyle (void)
5794 tree parm, decl, next;
5795 tree fndecl = current_function_decl;
5797 /* This is the identifier list from the function declarator. */
5798 tree parmids = current_function_parms;
5800 /* This is anything which appeared in current_scope->names that
5801 wasn't a PARM_DECL. */
5804 /* We use DECL_WEAK as a flag to show which parameters have been
5805 seen already, since it is not used on PARM_DECL or CONST_DECL. */
5806 for (parm = current_scope->names; parm; parm = TREE_CHAIN (parm))
5807 DECL_WEAK (parm) = 0;
5809 /* Match each formal parameter name with its declaration. Save each
5810 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5811 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5813 if (TREE_VALUE (parm) == 0)
5815 error ("%Hparameter name missing from parameter list",
5816 &DECL_SOURCE_LOCATION (fndecl));
5817 TREE_PURPOSE (parm) = 0;
5821 decl = IDENTIFIER_SYMBOL_VALUE (TREE_VALUE (parm));
5822 if (decl && DECL_CONTEXT (decl) == fndecl)
5824 const location_t *locus = &DECL_SOURCE_LOCATION (decl);
5825 /* If we got something other than a PARM_DECL it is an error. */
5826 if (TREE_CODE (decl) != PARM_DECL)
5827 error ("%H\"%D\" declared as a non-parameter", locus, decl);
5828 /* If the declaration is already marked, we have a duplicate
5829 name. Complain and ignore the duplicate. */
5830 else if (DECL_WEAK (decl))
5832 error ("%Hmultiple parameters named \"%D\"", locus, decl);
5833 TREE_PURPOSE (parm) = 0;
5836 /* If the declaration says "void", complain and turn it into
5838 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5840 error ("%Hparameter \"%D\" declared void", locus, decl);
5841 TREE_TYPE (decl) = integer_type_node;
5842 DECL_ARG_TYPE (decl) = integer_type_node;
5843 layout_decl (decl, 0);
5846 /* If no declaration found, default to int. */
5849 const location_t *locus = &DECL_SOURCE_LOCATION (fndecl);
5850 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5851 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5852 DECL_SOURCE_LOCATION (decl) = *locus;
5856 pedwarn ("%Htype of \"%D\" defaults to \"int\"", locus, decl);
5857 else if (extra_warnings)
5858 warning ("%Htype of \"%D\" defaults to \"int\"", locus, decl);
5861 TREE_PURPOSE (parm) = decl;
5862 DECL_WEAK (decl) = 1;
5865 /* Put anything which is in current_scope->names and which is
5866 not a PARM_DECL onto the list NONPARMS. (The types of
5867 non-parm things which might appear on the list include
5868 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5869 any actual PARM_DECLs not matched with any names. */
5872 for (parm = current_scope->names; parm; parm = next)
5874 const location_t *locus = &DECL_SOURCE_LOCATION (parm);
5875 next = TREE_CHAIN (parm);
5876 TREE_CHAIN (parm) = 0;
5878 if (TREE_CODE (parm) != PARM_DECL)
5880 nonparms = chainon (nonparms, parm);
5884 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5886 error ("%Hparameter \"%D\" has incomplete type", locus, parm);
5887 TREE_TYPE (parm) = error_mark_node;
5890 if (! DECL_WEAK (parm))
5892 error ("%Hdeclaration for parameter \"%D\" but no such parameter",
5895 /* Pretend the parameter was not missing.
5896 This gets us to a standard state and minimizes
5897 further error messages. */
5898 parmids = chainon (parmids, tree_cons (parm, 0, 0));
5902 /* Chain the declarations together in the order of the list of
5903 names. Store that chain in the function decl, replacing the
5905 DECL_ARGUMENTS (fndecl) = 0;
5908 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5909 if (TREE_PURPOSE (parm))
5911 if (parm && TREE_PURPOSE (parm))
5913 last = TREE_PURPOSE (parm);
5914 DECL_ARGUMENTS (fndecl) = last;
5915 DECL_WEAK (last) = 0;
5917 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
5918 if (TREE_PURPOSE (parm))
5920 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5921 last = TREE_PURPOSE (parm);
5922 DECL_WEAK (last) = 0;
5924 TREE_CHAIN (last) = 0;
5928 /* If there was a previous prototype,
5929 set the DECL_ARG_TYPE of each argument according to
5930 the type previously specified, and report any mismatches. */
5932 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5935 for (parm = DECL_ARGUMENTS (fndecl),
5936 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5937 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5938 != void_type_node));
5939 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5941 if (parm == 0 || type == 0
5942 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5944 error ("number of arguments doesn't match prototype");
5945 error ("%Hprototype declaration",
5946 ¤t_function_prototype_locus);
5949 /* Type for passing arg must be consistent with that
5950 declared for the arg. ISO C says we take the unqualified
5951 type for parameters declared with qualified type. */
5952 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5953 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
5956 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5957 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5959 /* Adjust argument to match prototype. E.g. a previous
5960 `int foo(float);' prototype causes
5961 `int foo(x) float x; {...}' to be treated like
5962 `int foo(float x) {...}'. This is particularly
5963 useful for argument types like uid_t. */
5964 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5966 if (PROMOTE_PROTOTYPES
5967 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5968 && TYPE_PRECISION (TREE_TYPE (parm))
5969 < TYPE_PRECISION (integer_type_node))
5970 DECL_ARG_TYPE (parm) = integer_type_node;
5974 pedwarn ("promoted argument \"%D\" "
5975 "doesn't match prototype", parm);
5976 pedwarn ("%Hprototype declaration",
5977 ¤t_function_prototype_locus);
5982 error ("argument \"%D\" doesn't match prototype", parm);
5983 error ("%Hprototype declaration",
5984 ¤t_function_prototype_locus);
5988 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5991 /* Otherwise, create a prototype that would match. */
5995 tree actual = 0, last = 0, type;
5997 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5999 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6001 TREE_CHAIN (last) = type;
6006 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6008 TREE_CHAIN (last) = type;
6012 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6013 of the type of this function, but we need to avoid having this
6014 affect the types of other similarly-typed functions, so we must
6015 first force the generation of an identical (but separate) type
6016 node for the relevant function type. The new node we create
6017 will be a variant of the main variant of the original function
6020 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6022 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6025 /* Now store the final chain of decls for the arguments
6026 as the decl-chain of the current lexical scope.
6027 Put the enumerators in as well, at the front so that
6028 DECL_ARGUMENTS is not modified. */
6030 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6033 /* Store the parameter declarations into the current function declaration.
6034 This is called after parsing the parameter declarations, before
6035 digesting the body of the function.
6037 For an old-style definition, construct a prototype out of the old-style
6038 parameter declarations and inject it into the function's type. */
6041 store_parm_decls (void)
6043 tree fndecl = current_function_decl;
6045 /* The function containing FNDECL, if any. */
6046 tree context = decl_function_context (fndecl);
6048 /* True if this definition is written with a prototype. */
6049 bool prototype = (current_function_parms
6050 && TREE_CODE (current_function_parms) != TREE_LIST);
6052 /* Don't re-emit shadow warnings. */
6053 bool saved_warn_shadow = warn_shadow;
6054 warn_shadow = false;
6057 store_parm_decls_newstyle ();
6059 store_parm_decls_oldstyle ();
6061 /* Make sure the scope for the top of the function body
6062 gets a BLOCK if there are any in the function.
6063 Otherwise, the dbx output is wrong. */
6065 keep_next_if_subblocks = 1;
6067 /* Write a record describing this function definition to the prototypes
6068 file (if requested). */
6070 gen_aux_info_record (fndecl, 1, 0, prototype);
6072 /* Initialize the RTL code for the function. */
6073 init_function_start (fndecl);
6075 /* Begin the statement tree for this function. */
6076 begin_stmt_tree (&DECL_SAVED_TREE (fndecl));
6078 /* If this is a nested function, save away the sizes of any
6079 variable-size types so that we can expand them when generating
6085 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6086 = nreverse (get_pending_sizes ());
6087 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6090 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6093 /* This function is being processed in whole-function mode. */
6094 cfun->x_whole_function_mode_p = 1;
6096 /* Even though we're inside a function body, we still don't want to
6097 call expand_expr to calculate the size of a variable-sized array.
6098 We haven't necessarily assigned RTL to all variables yet, so it's
6099 not safe to try to expand expressions involving them. */
6100 immediate_size_expand = 0;
6101 cfun->x_dont_save_pending_sizes_p = 1;
6103 warn_shadow = saved_warn_shadow;
6106 /* Finish up a function declaration and compile that function
6107 all the way to assembler language output. The free the storage
6108 for the function definition.
6110 This is called after parsing the body of the function definition.
6112 NESTED is nonzero if the function being finished is nested in another.
6113 CAN_DEFER_P is nonzero if the function may be deferred. */
6116 finish_function (int nested, int can_defer_p)
6118 tree fndecl = current_function_decl;
6120 /* When a function declaration is totally empty, e.g.
6122 (the argument list is irrelevant) the compstmt rule will not
6123 bother calling pushlevel/poplevel, which means we get here with
6124 the scope stack out of sync. Detect this situation by
6125 noticing that current_scope is still as
6126 store_parm_decls left it, and do a dummy push/pop to get back to
6127 consistency. Note that the call to pushlevel does not actually
6128 push another scope - see there for details. */
6129 if (current_scope->parm_flag && keep_next_if_subblocks)
6135 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6137 /* Must mark the RESULT_DECL as being in this function. */
6139 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6141 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6143 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6144 != integer_type_node)
6146 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6147 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6149 pedwarn ("%Hreturn type of '%D' is not `int'",
6150 &DECL_SOURCE_LOCATION (fndecl), fndecl);
6154 #ifdef DEFAULT_MAIN_RETURN
6155 /* Make it so that `main' always returns success by default. */
6156 DEFAULT_MAIN_RETURN;
6159 c_expand_return (integer_zero_node);
6164 finish_fname_decls ();
6166 /* Tie off the statement tree for this function. */
6167 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6169 /* Complain if there's just no return statement. */
6170 if (warn_return_type
6171 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6172 && !current_function_returns_value && !current_function_returns_null
6173 /* Don't complain if we abort. */
6174 && !current_function_returns_abnormally
6175 /* Don't warn for main(). */
6176 && !MAIN_NAME_P (DECL_NAME (fndecl))
6177 /* Or if they didn't actually specify a return type. */
6178 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6179 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6180 inline function, as we might never be compiled separately. */
6181 && DECL_INLINE (fndecl))
6182 warning ("no return statement in function returning non-void");
6184 /* Clear out memory we no longer need. */
6185 free_after_parsing (cfun);
6186 /* Since we never call rest_of_compilation, we never clear
6187 CFUN. Do so explicitly. */
6188 free_after_compilation (cfun);
6191 if (flag_unit_at_a_time && can_defer_p)
6193 cgraph_finalize_function (fndecl, DECL_SAVED_TREE (fndecl));
6194 current_function_decl = NULL;
6200 /* Function is parsed.
6201 Generate RTL for the body of this function or defer
6202 it for later expansion. */
6203 int uninlinable = 1;
6205 /* There's no reason to do any of the work here if we're only doing
6206 semantic analysis; this code just generates RTL. */
6207 if (flag_syntax_only)
6209 current_function_decl = NULL;
6210 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6214 if (flag_inline_trees)
6216 /* First, cache whether the current function is inlinable. Some
6217 predicates depend on cfun and current_function_decl to
6218 function completely. */
6219 timevar_push (TV_INTEGRATION);
6220 uninlinable = ! tree_inlinable_function_p (fndecl, 0);
6223 /* We defer functions marked inline *even if* the function
6224 itself is not inlinable. This is because we don't yet
6225 know if the function will actually be used; we may be
6226 able to avoid emitting it entirely. */
6227 && (! uninlinable || DECL_DECLARED_INLINE_P (fndecl))
6228 /* Save function tree for inlining. Should return 0 if the
6229 language does not support function deferring or the
6230 function could not be deferred. */
6231 && defer_fn (fndecl))
6233 /* Let the back-end know that this function exists. */
6234 (*debug_hooks->deferred_inline_function) (fndecl);
6235 timevar_pop (TV_INTEGRATION);
6236 current_function_decl = NULL;
6240 /* Then, inline any functions called in it. */
6241 optimize_inline_calls (fndecl);
6242 timevar_pop (TV_INTEGRATION);
6245 c_expand_body (fndecl);
6247 /* Keep the function body if it's needed for inlining or dumping. */
6248 if (uninlinable && !dump_enabled_p (TDI_all))
6250 /* Allow the body of the function to be garbage collected. */
6251 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6254 /* Let the error reporting routines know that we're outside a
6255 function. For a nested function, this value is used in
6256 c_pop_function_context and then reset via pop_function_context. */
6257 current_function_decl = NULL;
6261 /* Generate the RTL for a deferred function FNDECL. */
6264 c_expand_deferred_function (tree fndecl)
6266 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6267 function was deferred, e.g. in duplicate_decls. */
6268 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6270 if (flag_inline_trees)
6272 timevar_push (TV_INTEGRATION);
6273 optimize_inline_calls (fndecl);
6274 timevar_pop (TV_INTEGRATION);
6276 c_expand_body (fndecl);
6277 current_function_decl = NULL;
6281 /* Called to move the SAVE_EXPRs for parameter declarations in a
6282 nested function into the nested function. DATA is really the
6283 nested FUNCTION_DECL. */
6286 set_save_expr_context (tree *tp,
6290 if (TREE_CODE (*tp) == SAVE_EXPR && !SAVE_EXPR_CONTEXT (*tp))
6291 SAVE_EXPR_CONTEXT (*tp) = (tree) data;
6292 /* Do not walk back into the SAVE_EXPR_CONTEXT; that will cause
6294 else if (DECL_P (*tp))
6300 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6301 then we are already in the process of generating RTL for another
6302 function. If can_defer_p is zero, we won't attempt to defer the
6303 generation of RTL. */
6306 c_expand_body_1 (tree fndecl, int nested_p)
6308 timevar_push (TV_EXPAND);
6312 /* Make sure that we will evaluate variable-sized types involved
6313 in our function's type. */
6314 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6315 /* Squirrel away our current state. */
6316 push_function_context ();
6319 /* Initialize the RTL code for the function. */
6320 current_function_decl = fndecl;
6321 input_location = DECL_SOURCE_LOCATION (fndecl);
6322 init_function_start (fndecl);
6324 /* This function is being processed in whole-function mode. */
6325 cfun->x_whole_function_mode_p = 1;
6327 /* Even though we're inside a function body, we still don't want to
6328 call expand_expr to calculate the size of a variable-sized array.
6329 We haven't necessarily assigned RTL to all variables yet, so it's
6330 not safe to try to expand expressions involving them. */
6331 immediate_size_expand = 0;
6332 cfun->x_dont_save_pending_sizes_p = 1;
6334 /* Set up parameters and prepare for return, for the function. */
6335 expand_function_start (fndecl, 0);
6337 /* If the function has a variably modified type, there may be
6338 SAVE_EXPRs in the parameter types. Their context must be set to
6339 refer to this function; they cannot be expanded in the containing
6341 if (decl_function_context (fndecl)
6342 && variably_modified_type_p (TREE_TYPE (fndecl)))
6343 walk_tree (&TREE_TYPE (fndecl), set_save_expr_context, fndecl,
6346 /* If this function is `main', emit a call to `__main'
6347 to run global initializers, etc. */
6348 if (DECL_NAME (fndecl)
6349 && MAIN_NAME_P (DECL_NAME (fndecl))
6350 && DECL_CONTEXT (fndecl) == NULL_TREE)
6351 expand_main_function ();
6353 /* Generate the RTL for this function. */
6354 expand_stmt (DECL_SAVED_TREE (fndecl));
6356 /* We hard-wired immediate_size_expand to zero above.
6357 expand_function_end will decrement this variable. So, we set the
6358 variable to one here, so that after the decrement it will remain
6360 immediate_size_expand = 1;
6362 /* Allow language dialects to perform special processing. */
6363 if (lang_expand_function_end)
6364 (*lang_expand_function_end) ();
6366 /* Generate rtl for function exit. */
6367 expand_function_end ();
6369 /* If this is a nested function, protect the local variables in the stack
6370 above us from being collected while we're compiling this function. */
6372 ggc_push_context ();
6374 /* Run the optimizers and output the assembler code for this function. */
6375 rest_of_compilation (fndecl);
6377 /* Undo the GC context switch. */
6381 /* With just -Wextra, complain only if function returns both with
6382 and without a value. */
6384 && current_function_returns_value
6385 && current_function_returns_null)
6386 warning ("this function may return with or without a value");
6388 /* If requested, warn about function definitions where the function will
6389 return a value (usually of some struct or union type) which itself will
6390 take up a lot of stack space. */
6392 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6394 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6396 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6397 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6398 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6401 const location_t *locus = &DECL_SOURCE_LOCATION (fndecl);
6402 unsigned int size_as_int
6403 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6405 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6406 warning ("%Hsize of return value of '%D' is %u bytes",
6407 locus, fndecl, size_as_int);
6409 warning ("%Hsize of return value of '%D' is larger than %wd bytes",
6410 locus, fndecl, larger_than_size);
6414 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6415 && ! flag_inline_trees)
6417 /* Stop pointing to the local nodes about to be freed.
6418 But DECL_INITIAL must remain nonzero so we know this
6419 was an actual function definition.
6420 For a nested function, this is done in c_pop_function_context.
6421 If rest_of_compilation set this to 0, leave it 0. */
6422 if (DECL_INITIAL (fndecl) != 0)
6423 DECL_INITIAL (fndecl) = error_mark_node;
6425 DECL_ARGUMENTS (fndecl) = 0;
6428 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6430 if (targetm.have_ctors_dtors)
6431 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6432 DEFAULT_INIT_PRIORITY);
6434 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6437 if (DECL_STATIC_DESTRUCTOR (fndecl))
6439 if (targetm.have_ctors_dtors)
6440 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6441 DEFAULT_INIT_PRIORITY);
6443 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6447 /* Return to the enclosing function. */
6448 pop_function_context ();
6449 timevar_pop (TV_EXPAND);
6452 /* Like c_expand_body_1 but only for unnested functions. */
6455 c_expand_body (tree fndecl)
6457 c_expand_body_1 (fndecl, 0);
6460 /* Check the declarations given in a for-loop for satisfying the C99
6463 check_for_loop_decls (void)
6469 /* If we get here, declarations have been used in a for loop without
6470 the C99 for loop scope. This doesn't make much sense, so don't
6472 error ("`for' loop initial declaration used outside C99 mode");
6475 /* C99 subclause 6.8.5 paragraph 3:
6477 [#3] The declaration part of a for statement shall only
6478 declare identifiers for objects having storage class auto or
6481 It isn't clear whether, in this sentence, "identifiers" binds to
6482 "shall only declare" or to "objects" - that is, whether all identifiers
6483 declared must be identifiers for objects, or whether the restriction
6484 only applies to those that are. (A question on this in comp.std.c
6485 in November 2000 received no answer.) We implement the strictest
6486 interpretation, to avoid creating an extension which later causes
6489 for (t = gettags (); t; t = TREE_CHAIN (t))
6491 if (TREE_PURPOSE (t) != 0)
6493 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6495 if (code == RECORD_TYPE)
6496 error ("`struct %s' declared in `for' loop initial declaration",
6497 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6498 else if (code == UNION_TYPE)
6499 error ("`union %s' declared in `for' loop initial declaration",
6500 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6502 error ("`enum %s' declared in `for' loop initial declaration",
6503 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6507 for (t = getdecls (); t; t = TREE_CHAIN (t))
6509 const location_t *locus = &DECL_SOURCE_LOCATION (t);
6510 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6511 error ("%Hdeclaration of non-variable '%D' in 'for' loop "
6512 "initial declaration", locus, t);
6513 else if (TREE_STATIC (t))
6514 error ("%Hdeclaration of static variable '%D' in 'for' loop "
6515 "initial declaration", locus, t);
6516 else if (DECL_EXTERNAL (t))
6517 error ("%Hdeclaration of 'extern' variable '%D' in 'for' loop "
6518 "initial declaration", locus, t);
6522 /* Save and restore the variables in this file and elsewhere
6523 that keep track of the progress of compilation of the current function.
6524 Used for nested functions. */
6526 struct language_function GTY(())
6528 struct c_language_function base;
6531 int returns_abnormally;
6532 int warn_about_return_type;
6536 /* Save and reinitialize the variables
6537 used during compilation of a C function. */
6540 c_push_function_context (struct function *f)
6542 struct language_function *p;
6543 p = ggc_alloc (sizeof (struct language_function));
6546 p->base.x_stmt_tree = c_stmt_tree;
6547 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6548 p->returns_value = current_function_returns_value;
6549 p->returns_null = current_function_returns_null;
6550 p->returns_abnormally = current_function_returns_abnormally;
6551 p->warn_about_return_type = warn_about_return_type;
6552 p->extern_inline = current_extern_inline;
6555 /* Restore the variables used during compilation of a C function. */
6558 c_pop_function_context (struct function *f)
6560 struct language_function *p = f->language;
6562 if (DECL_SAVED_INSNS (current_function_decl) == 0
6563 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6565 /* Stop pointing to the local nodes about to be freed. */
6566 /* But DECL_INITIAL must remain nonzero so we know this
6567 was an actual function definition. */
6568 DECL_INITIAL (current_function_decl) = error_mark_node;
6569 DECL_ARGUMENTS (current_function_decl) = 0;
6572 c_stmt_tree = p->base.x_stmt_tree;
6573 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6574 current_function_returns_value = p->returns_value;
6575 current_function_returns_null = p->returns_null;
6576 current_function_returns_abnormally = p->returns_abnormally;
6577 warn_about_return_type = p->warn_about_return_type;
6578 current_extern_inline = p->extern_inline;
6583 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6586 c_dup_lang_specific_decl (tree decl)
6588 struct lang_decl *ld;
6590 if (!DECL_LANG_SPECIFIC (decl))
6593 ld = ggc_alloc (sizeof (struct lang_decl));
6594 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6595 DECL_LANG_SPECIFIC (decl) = ld;
6598 /* The functions below are required for functionality of doing
6599 function at once processing in the C front end. Currently these
6600 functions are not called from anywhere in the C front end, but as
6601 these changes continue, that will change. */
6603 /* Returns nonzero if the current statement is a full expression,
6604 i.e. temporaries created during that statement should be destroyed
6605 at the end of the statement. */
6608 stmts_are_full_exprs_p (void)
6613 /* Returns the stmt_tree (if any) to which statements are currently
6614 being added. If there is no active statement-tree, NULL is
6618 current_stmt_tree (void)
6620 return &c_stmt_tree;
6623 /* Returns the stack of SCOPE_STMTs for the current function. */
6626 current_scope_stmt_stack (void)
6628 return &c_scope_stmt_stack;
6631 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6635 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6640 /* Dummy function in place of callback used by C++. */
6643 extract_interface_info (void)
6647 /* Return a new COMPOUND_STMT, after adding it to the current
6651 c_begin_compound_stmt (void)
6655 /* Create the COMPOUND_STMT. */
6656 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6661 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6665 c_expand_decl_stmt (tree t)
6667 tree decl = DECL_STMT_DECL (t);
6669 /* Expand nested functions. */
6670 if (TREE_CODE (decl) == FUNCTION_DECL
6671 && DECL_CONTEXT (decl) == current_function_decl
6672 && DECL_SAVED_TREE (decl))
6673 c_expand_body_1 (decl, 1);
6676 /* Return the global value of T as a symbol. */
6679 identifier_global_value (tree t)
6681 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6682 if (decl == 0 || C_DECL_FILE_SCOPE (decl))
6685 /* Shadowed by something else; find the true global value. */
6686 for (decl = global_scope->names; decl; decl = TREE_CHAIN (decl))
6687 if (DECL_NAME (decl) == t)
6690 /* Only local values for this decl. */
6694 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6695 otherwise the name is found in ridpointers from RID_INDEX. */
6698 record_builtin_type (enum rid rid_index, const char *name, tree type)
6702 id = ridpointers[(int) rid_index];
6704 id = get_identifier (name);
6705 pushdecl (build_decl (TYPE_DECL, id, type));
6708 /* Build the void_list_node (void_type_node having been created). */
6710 build_void_list_node (void)
6712 tree t = build_tree_list (NULL_TREE, void_type_node);
6716 /* Return something to represent absolute declarators containing a *.
6717 TARGET is the absolute declarator that the * contains.
6718 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6719 to apply to the pointer type, represented as identifiers, possible mixed
6722 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6723 if attributes are present) and whose type is the modifier list. */
6726 make_pointer_declarator (tree type_quals_attrs, tree target)
6729 tree itarget = target;
6730 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6731 if (attrs != NULL_TREE)
6732 itarget = tree_cons (attrs, target, NULL_TREE);
6733 return build1 (INDIRECT_REF, quals, itarget);
6736 /* A wrapper around lhd_set_decl_assembler_name that gives static
6737 variables their C names if they are at file scope and only one
6738 translation unit is being compiled, for backwards compatibility
6739 with certain bizzare assembler hacks (like crtstuff.c). */
6742 c_static_assembler_name (tree decl)
6744 if (num_in_fnames == 1
6745 && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6746 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6747 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6749 lhd_set_decl_assembler_name (decl);
6752 /* Hash and equality functions for link_hash_table: key off
6753 DECL_ASSEMBLER_NAME. */
6756 link_hash_hash (const void *x_p)
6759 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6763 link_hash_eq (const void *x1_p, const void *x2_p)
6765 tree x1 = (tree)x1_p;
6766 tree x2 = (tree)x2_p;
6767 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6770 /* Propagate information between definitions and uses between multiple
6771 translation units in TU_LIST based on linkage rules. */
6774 merge_translation_unit_decls (void)
6776 const tree tu_list = current_file_decl;
6779 htab_t link_hash_table;
6782 /* Create the BLOCK that poplevel would have created, but don't
6783 actually call poplevel since that's expensive. */
6784 block = make_node (BLOCK);
6785 BLOCK_VARS (block) = current_scope->names;
6786 TREE_USED (block) = 1;
6787 DECL_INITIAL (current_file_decl) = block;
6789 /* If only one translation unit seen, no copying necessary. */
6790 if (TREE_CHAIN (tu_list) == NULL_TREE)
6793 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6795 /* Enter any actual definitions into the hash table. */
6796 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6797 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6798 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6801 slot = htab_find_slot (link_hash_table, decl, INSERT);
6803 /* If we've already got a definition, work out which one is
6804 the real one, put it into the hash table, and make the
6805 other one DECL_EXTERNAL. This is important to avoid
6806 putting out two definitions of the same symbol in the
6810 tree old_decl = (tree) *slot;
6812 /* If this is weak or common or whatever, suppress it
6813 in favour of the other definition. */
6814 if (DECL_WEAK (decl))
6815 DECL_EXTERNAL (decl) = 1;
6816 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6817 DECL_EXTERNAL (old_decl) = 1;
6818 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6819 DECL_EXTERNAL (decl) = 1;
6820 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6821 DECL_EXTERNAL (old_decl) = 1;
6823 if (DECL_EXTERNAL (decl))
6825 DECL_INITIAL (decl) = NULL_TREE;
6826 DECL_COMMON (decl) = 0;
6827 DECL_ONE_ONLY (decl) = 0;
6828 DECL_WEAK (decl) = 0;
6830 else if (DECL_EXTERNAL (old_decl))
6832 DECL_INITIAL (old_decl) = NULL_TREE;
6833 DECL_COMMON (old_decl) = 0;
6834 DECL_ONE_ONLY (old_decl) = 0;
6835 DECL_WEAK (old_decl) = 0;
6840 error ("%Hredefinition of global '%D'",
6841 &DECL_SOURCE_LOCATION (decl), decl);
6842 error ("%H'%D' previously defined here",
6843 &DECL_SOURCE_LOCATION (old_decl), old_decl);
6850 /* Now insert the desired information from all the definitions
6851 into any plain declarations. */
6852 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6853 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6854 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6857 global_decl = htab_find (link_hash_table, decl);
6862 /* Print any appropriate error messages, and partially merge
6864 (void) duplicate_decls (decl, global_decl, true, true);
6867 htab_delete (link_hash_table);
6870 /* Perform final processing on file-scope data. */
6873 c_write_global_declarations(void)
6877 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6879 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6880 int len = list_length (globals);
6881 tree *vec = xmalloc (sizeof (tree) * len);
6885 /* Process the decls in reverse order--earliest first.
6886 Put them into VEC from back to front, then take out from front. */
6888 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6889 vec[len - i - 1] = decl;
6891 wrapup_global_declarations (vec, len);
6893 check_global_declarations (vec, len);
6900 /* Reset the parser's state in preparation for a new file. */
6903 c_reset_state (void)
6906 tree file_scope_decl;
6908 /* Pop the global scope. */
6909 if (current_scope != global_scope)
6910 current_scope = global_scope;
6911 file_scope_decl = current_file_decl;
6912 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6913 truly_local_externals = NULL_TREE;
6915 /* Start a new global binding level. */
6917 global_scope = current_scope;
6918 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6919 TREE_CHAIN (current_file_decl) = file_scope_decl;
6921 /* Reintroduce the global declarations. */
6922 for (link = builtin_decls; link; link = TREE_CHAIN (link))
6923 pushdecl (copy_node (link));
6926 #include "gt-c-decl.h"