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 tree c_make_fname_decl (tree, int);
279 static void c_expand_body_1 (tree, int);
280 static tree any_external_decl (tree);
281 static void record_external_decl (tree);
282 static void warn_if_shadowing (tree, tree);
283 static void clone_underlying_type (tree);
284 static void pushdecl_function_level (tree, tree);
285 static bool flexible_array_type_p (tree);
286 static hashval_t link_hash_hash (const void *);
287 static int link_hash_eq (const void *, const void *);
289 /* States indicating how grokdeclarator() should handle declspecs marked
290 with __attribute__((deprecated)). An object declared as
291 __attribute__((deprecated)) suppresses warnings of uses of other
294 enum deprecated_states {
299 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
302 c_print_identifier (FILE *file, tree node, int indent)
304 print_node (file, "symbol", IDENTIFIER_SYMBOL_VALUE (node), indent + 4);
305 print_node (file, "tag", IDENTIFIER_TAG_VALUE (node), indent + 4);
306 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
307 if (C_IS_RESERVED_WORD (node))
309 tree rid = ridpointers[C_RID_CODE (node)];
310 indent_to (file, indent + 4);
311 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
312 (void *) rid, IDENTIFIER_POINTER (rid));
316 /* Hook called at end of compilation to assume 1 elt
317 for a file-scope tentative array defn that wasn't complete before. */
320 c_finish_incomplete_decl (tree decl)
322 if (TREE_CODE (decl) == VAR_DECL)
324 tree type = TREE_TYPE (decl);
325 if (type != error_mark_node
326 && TREE_CODE (type) == ARRAY_TYPE
327 && ! DECL_EXTERNAL (decl)
328 && TYPE_DOMAIN (type) == 0)
330 warning ("%Harray '%D' assumed to have one element",
331 &DECL_SOURCE_LOCATION (decl), decl);
333 complete_array_type (type, NULL_TREE, 1);
335 layout_decl (decl, 0);
340 /* Reuse or create a struct for this scope. */
342 static struct c_scope *
345 struct c_scope *result;
348 result = scope_freelist;
349 scope_freelist = result->outer;
352 result = ggc_alloc_cleared (sizeof (struct c_scope));
357 /* Remove the topmost scope from the stack and add it to the
358 free list, updating current_function_scope if necessary. */
363 struct c_scope *scope = current_scope;
365 current_scope = scope->outer;
366 if (scope->function_body)
367 current_function_scope = scope->outer_function;
369 memset (scope, 0, sizeof (struct c_scope));
370 scope->outer = scope_freelist;
371 scope_freelist = scope;
374 /* Nonzero if we are currently in the global scope. */
377 global_bindings_p (void)
379 return current_scope == global_scope;
383 keep_next_level (void)
385 keep_next_level_flag = true;
388 /* Identify this scope as currently being filled with parameters. */
391 declare_parm_level (void)
393 current_scope->parm_flag = true;
396 /* Nonzero if currently making parm declarations. */
399 in_parm_level_p (void)
401 return current_scope->parm_flag;
404 /* Enter a new scope. */
407 pushlevel (int dummy ATTRIBUTE_UNUSED)
409 if (keep_next_if_subblocks)
411 /* This is the transition from the parameters to the top level
412 of the function body. These are the same scope
413 (C99 6.2.1p4,6) so we do not push another scope structure.
415 XXX Note kludge - keep_next_if_subblocks is set only by
416 store_parm_decls, which in turn is called when and only
417 when we are about to encounter the opening curly brace for
418 the function body. */
419 current_scope->parm_flag = false;
420 current_scope->function_body = true;
421 current_scope->keep |= keep_next_level_flag;
422 current_scope->keep_if_subblocks = true;
423 current_scope->outer_function = current_function_scope;
424 current_function_scope = current_scope;
426 keep_next_level_flag = false;
427 keep_next_if_subblocks = false;
431 struct c_scope *scope = make_scope ();
433 scope->keep = keep_next_level_flag;
434 scope->outer = current_scope;
435 current_scope = scope;
436 keep_next_level_flag = false;
440 /* Exit a scope. Restore the state of the identifier-decl mappings
441 that were in effect when this scope was entered.
443 If KEEP is KEEP_YES (1), this scope had explicit declarations, so
444 create a BLOCK node to record its declarations and subblocks for
445 debugging output. If KEEP is KEEP_MAYBE, do so only if the names
446 or tags lists are nonempty.
448 If FUNCTIONBODY is nonzero, this level is the body of a function,
449 so create a block as if KEEP were set and also clear out all
452 If REVERSE is nonzero, reverse the order of decls before putting
453 them into the BLOCK. */
456 poplevel (int keep, int reverse, int functionbody)
461 tree decls = current_scope->names;
462 tree tags = current_scope->tags;
463 tree subblocks = current_scope->blocks;
465 functionbody |= current_scope->function_body;
467 if (keep == KEEP_MAYBE)
468 keep = (current_scope->names || current_scope->tags);
470 keep |= (current_scope->keep || functionbody
471 || (subblocks && current_scope->keep_if_subblocks));
473 /* We used to warn about unused variables in expand_end_bindings,
474 i.e. while generating RTL. But in function-at-a-time mode we may
475 choose to never expand a function at all (e.g. auto inlining), so
476 we do this explicitly now.
477 No warnings when the global scope is popped because the global
478 scope isn't popped for the last translation unit, so the warnings
479 are done in c_write_global_declaration. */
480 if (current_scope != global_scope)
481 warn_about_unused_variables (decls);
483 /* Clear out the name-meanings declared in this scope.
484 Propagate TREE_ADDRESSABLE from nested functions to their
485 containing functions. */
486 for (link = decls; link; link = TREE_CHAIN (link))
488 if (TREE_CODE (link) == LABEL_DECL)
490 if (TREE_USED (link) && DECL_INITIAL (link) == 0)
492 error ("%Hlabel `%D' used but not defined",
493 &DECL_SOURCE_LOCATION (link), link);
494 /* Avoid crashing later. */
495 DECL_INITIAL (link) = error_mark_node;
497 else if (!TREE_USED (link) && warn_unused_label)
499 if (DECL_INITIAL (link) != 0)
500 warning ("%Hlabel `%D' defined but not used",
501 &DECL_SOURCE_LOCATION (link), link);
503 warning ("%Hlabel `%D' declared but not defined",
504 &DECL_SOURCE_LOCATION (link), link);
506 IDENTIFIER_LABEL_VALUE (DECL_NAME (link)) = 0;
508 else if (DECL_NAME (link) != 0)
510 if (DECL_EXTERNAL (link)
511 && current_scope != global_scope)
512 /* External decls stay in the symbol-value slot but are
514 C_DECL_INVISIBLE (link) = 1;
516 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (link)) = 0;
519 if (TREE_CODE (link) == FUNCTION_DECL
520 && ! TREE_ASM_WRITTEN (link)
521 && DECL_INITIAL (link) != 0
522 && TREE_ADDRESSABLE (link)
523 && DECL_ABSTRACT_ORIGIN (link) != 0
524 && DECL_ABSTRACT_ORIGIN (link) != link)
525 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (link)) = 1;
528 /* Clear out the tag-meanings declared in this scope. */
529 for (link = tags; link; link = TREE_CHAIN (link))
530 if (TREE_PURPOSE (link))
531 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (link)) = 0;
533 /* Restore all name- and label-meanings from outer scopes that were
534 shadowed by this scope. */
536 for (link = current_scope->shadowed; link; link = TREE_CHAIN (link))
537 if (TREE_VALUE (link) && TREE_CODE (TREE_VALUE (link)) == LABEL_DECL)
538 IDENTIFIER_LABEL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
540 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
542 /* Restore all tag-meanings from outer scopes that were shadowed by
545 for (link = current_scope->shadowed_tags; link;
546 link = TREE_CHAIN (link))
547 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
549 /* If this is the outermost block of a function, remove all
550 PARM_DECLs from current_scope->names; they are already
551 stored in DECL_ARGUMENTS of cfun->decl in proper order, should
552 not be put in BLOCK_VARS, and furthermore reversing them will
553 cause trouble later. They are all together at the end of the
555 if (functionbody && decls)
557 if (TREE_CODE (decls) == PARM_DECL)
562 while (TREE_CHAIN (link)
563 && TREE_CODE (TREE_CHAIN (link)) != PARM_DECL)
564 link = TREE_CHAIN (link);
566 TREE_CHAIN (link) = 0;
570 /* Get the decls in the order they were written.
571 Usually current_scope->names is in reverse order.
572 But parameter decls were previously put in forward order. */
575 decls = nreverse (decls);
577 /* If appropriate, create a BLOCK to record the decls for the life
583 block = make_node (BLOCK);
584 BLOCK_VARS (block) = decls;
585 BLOCK_SUBBLOCKS (block) = subblocks;
586 TREE_USED (block) = 1;
589 /* In each subblock, record that this is its superior. */
591 for (link = subblocks; link; link = TREE_CHAIN (link))
592 BLOCK_SUPERCONTEXT (link) = block;
594 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
595 binding contour so that they point to the appropriate construct, i.e.
596 either to the current FUNCTION_DECL node, or else to the BLOCK node
599 Note that for tagged types whose scope is just the formal parameter
600 list for some function type specification, we can't properly set
601 their TYPE_CONTEXTs here, because we don't have a pointer to the
602 appropriate FUNCTION_TYPE node readily available to us. For those
603 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
604 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
605 node which will represent the "scope" for these "parameter list local"
608 decl = functionbody ? current_function_decl : block;
610 for (link = tags; link; link = TREE_CHAIN (link))
611 TYPE_CONTEXT (TREE_VALUE (link)) = decl;
613 /* Pop the current scope, and free the structure for reuse. */
616 /* Dispose of the block that we just made inside some higher level. */
618 DECL_INITIAL (current_function_decl) = block;
619 else if (block && current_scope)
620 current_scope->blocks
621 = chainon (current_scope->blocks, block);
622 /* If we did not make a block for the scope just exited, any blocks
623 made for inner scopes (since they cannot be recorded as subblocks
624 here) must be carried forward so they will later become subblocks
625 of something else. */
626 else if (! block && subblocks)
627 current_scope->blocks
628 = chainon (current_scope->blocks, subblocks);
633 /* Insert BLOCK at the end of the list of subblocks of the current
634 scope. This is used when a BIND_EXPR is expanded, to handle the
635 BLOCK node inside the BIND_EXPR. */
638 insert_block (tree block)
640 TREE_USED (block) = 1;
641 current_scope->blocks
642 = chainon (current_scope->blocks, block);
645 /* Set the BLOCK node for the innermost scope (the one we are
646 currently in). The RTL expansion machinery requires us to provide
647 this hook, but it is not useful in function-at-a-time mode. */
650 set_block (tree block ATTRIBUTE_UNUSED)
654 /* Push a definition or a declaration of struct, union or enum tag "name".
655 "type" should be the type node.
656 We assume that the tag "name" is not already defined.
658 Note that the definition may really be just a forward reference.
659 In that case, the TYPE_SIZE will be zero. */
662 pushtag (tree name, tree type)
664 struct c_scope *b = current_scope;
668 /* Record the identifier as the type's name if it has none. */
670 if (TYPE_NAME (type) == 0)
671 TYPE_NAME (type) = name;
673 if (IDENTIFIER_TAG_VALUE (name))
674 b->shadowed_tags = tree_cons (name, IDENTIFIER_TAG_VALUE (name),
676 IDENTIFIER_TAG_VALUE (name) = type;
679 b->tags = tree_cons (name, type, b->tags);
681 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
682 tagged type we just added to the current scope. This fake
683 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
684 to output a representation of a tagged type, and it also gives
685 us a convenient place to record the "scope start" address for the
688 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
690 /* An approximation for now, so we can tell this is a function-scope tag.
691 This will be updated in poplevel. */
692 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
695 /* Subroutine of duplicate_decls. Allow harmless mismatches in return
696 and argument types provided that the type modes match. This function
697 return a unified type given a suitable match, and 0 otherwise. */
700 match_builtin_function_types (tree oldtype, tree newtype)
702 tree newrettype, oldrettype;
703 tree newargs, oldargs;
704 tree trytype, tryargs;
706 /* Accept the return type of the new declaration if same modes. */
707 oldrettype = TREE_TYPE (oldtype);
708 newrettype = TREE_TYPE (newtype);
710 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
713 oldargs = TYPE_ARG_TYPES (oldtype);
714 newargs = TYPE_ARG_TYPES (newtype);
717 while (oldargs || newargs)
721 || ! TREE_VALUE (oldargs)
722 || ! TREE_VALUE (newargs)
723 || TYPE_MODE (TREE_VALUE (oldargs))
724 != TYPE_MODE (TREE_VALUE (newargs)))
727 oldargs = TREE_CHAIN (oldargs);
728 newargs = TREE_CHAIN (newargs);
731 trytype = build_function_type (newrettype, tryargs);
732 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
735 /* Handle when a new declaration NEWDECL
736 has the same name as an old one OLDDECL
737 in the same binding contour.
738 Prints an error message if appropriate.
740 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
743 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
744 and OLDDECL is in an outer scope and should thus not be changed. */
747 duplicate_decls (tree newdecl, tree olddecl, int different_binding_level,
750 int comptype_flags = (different_tu ? COMPARE_DIFFERENT_TU
752 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl),
754 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
755 && DECL_INITIAL (newdecl) != 0);
756 tree oldtype = TREE_TYPE (olddecl);
757 tree newtype = TREE_TYPE (newdecl);
760 if (DECL_P (olddecl))
762 if (TREE_CODE (newdecl) == FUNCTION_DECL
763 && TREE_CODE (olddecl) == FUNCTION_DECL
764 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
766 if (DECL_DECLARED_INLINE_P (newdecl)
767 && DECL_UNINLINABLE (newdecl)
768 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
769 /* Already warned elsewhere. */;
770 else if (DECL_DECLARED_INLINE_P (olddecl)
771 && DECL_UNINLINABLE (olddecl)
772 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
773 /* Already warned. */;
774 else if (DECL_DECLARED_INLINE_P (newdecl)
775 && ! DECL_DECLARED_INLINE_P (olddecl)
776 && DECL_UNINLINABLE (olddecl)
777 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
779 warning ("%Hfunction '%D' redeclared as inline",
780 &DECL_SOURCE_LOCATION (newdecl), newdecl);
781 warning ("%Hprevious declaration of function '%D' "
782 "with attribute noinline",
783 &DECL_SOURCE_LOCATION (olddecl), olddecl);
785 else if (DECL_DECLARED_INLINE_P (olddecl)
786 && DECL_UNINLINABLE (newdecl)
787 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
789 warning ("%Hfunction '%D' redeclared with attribute noinline",
790 &DECL_SOURCE_LOCATION (newdecl), newdecl);
791 warning ("%Hprevious declaration of function '%D' was inline",
792 &DECL_SOURCE_LOCATION (olddecl), olddecl);
796 DECL_ATTRIBUTES (newdecl)
797 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
800 if (TREE_CODE (newtype) == ERROR_MARK
801 || TREE_CODE (oldtype) == ERROR_MARK)
804 /* New decl is completely inconsistent with the old one =>
805 tell caller to replace the old one.
806 This is always an error except in the case of shadowing a builtin. */
807 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
809 if (TREE_CODE (olddecl) == FUNCTION_DECL
810 && DECL_BUILT_IN (olddecl))
812 /* If you declare a built-in or predefined function name as static,
813 the old definition is overridden,
814 but optionally warn this was a bad choice of name. */
815 if (!TREE_PUBLIC (newdecl))
818 warning ("%Hshadowing built-in function '%D'",
819 &DECL_SOURCE_LOCATION (newdecl), newdecl);
822 warning ("%Hbuilt-in function '%D' declared as non-function",
823 &DECL_SOURCE_LOCATION (newdecl), newdecl);
827 error ("%H'%D' redeclared as different kind of symbol",
828 &DECL_SOURCE_LOCATION (newdecl), newdecl);
829 error ("%Hprevious declaration of '%D'",
830 &DECL_SOURCE_LOCATION (olddecl), olddecl);
836 /* For real parm decl following a forward decl, return 1 so old decl
837 will be reused. Only allow this to happen once. */
838 if (types_match && TREE_CODE (newdecl) == PARM_DECL
839 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
841 TREE_ASM_WRITTEN (olddecl) = 0;
845 /* The new declaration is the same kind of object as the old one.
846 The declarations may partially match. Print warnings if they don't
847 match enough. Ultimately, copy most of the information from the new
848 decl to the old one, and keep using the old one. */
850 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
852 /* A function declaration for a built-in function. */
853 if (!TREE_PUBLIC (newdecl))
855 /* If you declare a built-in function name as static, the
856 built-in definition is overridden,
857 but optionally warn this was a bad choice of name. */
859 warning ("%Hshadowing built-in function '%D'",
860 &DECL_SOURCE_LOCATION (newdecl), newdecl);
861 /* Discard the old built-in function. */
864 else if (!types_match)
866 /* Accept harmless mismatch in function types.
867 This is for the ffs and fprintf builtins. */
868 tree trytype = match_builtin_function_types (oldtype, newtype);
872 types_match = comptypes (newtype, trytype, comptype_flags);
875 if (! different_binding_level)
876 TREE_TYPE (olddecl) = oldtype;
879 else if (TYPE_ARG_TYPES (oldtype) == NULL
880 && TYPE_ARG_TYPES (newtype) != NULL)
882 /* For bcmp, bzero, fputs the builtin type has arguments not
883 specified. Use the ones from the prototype so that type checking
886 = build_function_type (TREE_TYPE (oldtype),
887 TYPE_ARG_TYPES (newtype));
888 trytype = build_type_attribute_variant (trytype,
889 TYPE_ATTRIBUTES (oldtype));
892 if (! different_binding_level)
893 TREE_TYPE (olddecl) = oldtype;
897 /* If types don't match for a built-in, throw away the built-in. */
898 warning ("%Hconflicting types for built-in function '%D'",
899 &DECL_SOURCE_LOCATION (newdecl), newdecl);
903 else if (TREE_CODE (olddecl) == FUNCTION_DECL
904 && DECL_SOURCE_LINE (olddecl) == 0)
906 /* A function declaration for a predeclared function
907 that isn't actually built in. */
908 if (!TREE_PUBLIC (newdecl))
910 /* If you declare it as static, the
911 default definition is overridden. */
914 else if (!types_match)
916 /* If the types don't match, preserve volatility indication.
917 Later on, we will discard everything else about the
918 default declaration. */
919 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
922 /* Permit char *foo () to match void *foo (...) if not pedantic,
923 if one of them came from a system header file. */
924 else if (!types_match
925 && TREE_CODE (olddecl) == FUNCTION_DECL
926 && TREE_CODE (newdecl) == FUNCTION_DECL
927 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
928 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
929 && (DECL_IN_SYSTEM_HEADER (olddecl)
930 || DECL_IN_SYSTEM_HEADER (newdecl))
931 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
932 && TYPE_ARG_TYPES (oldtype) == 0
933 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
934 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
936 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
937 && TYPE_ARG_TYPES (newtype) == 0
938 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
939 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
942 pedwarn ("%Hconflicting types for '%D'",
943 &DECL_SOURCE_LOCATION (newdecl), newdecl);
944 /* Make sure we keep void * as ret type, not char *. */
945 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
946 TREE_TYPE (newdecl) = newtype = oldtype;
948 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
949 we will come back here again. */
950 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
952 /* Permit void foo (...) to match int foo (...) if the latter is the
953 definition and implicit int was used. See c-torture/compile/920625-2.c. */
954 else if (!types_match && new_is_definition
955 && TREE_CODE (olddecl) == FUNCTION_DECL
956 && TREE_CODE (newdecl) == FUNCTION_DECL
957 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
958 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
959 && C_FUNCTION_IMPLICIT_INT (newdecl))
961 pedwarn ("%Hconflicting types for '%D'",
962 &DECL_SOURCE_LOCATION (newdecl), newdecl);
963 /* Make sure we keep void as the return type. */
964 TREE_TYPE (newdecl) = newtype = oldtype;
965 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
967 else if (!types_match
968 /* Permit char *foo (int, ...); followed by char *foo ();
970 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
972 /* Return types must still match. */
973 && comptypes (TREE_TYPE (oldtype),
974 TREE_TYPE (newtype), comptype_flags)
975 && TYPE_ARG_TYPES (newtype) == 0))
977 error ("%Hconflicting types for '%D'",
978 &DECL_SOURCE_LOCATION (newdecl), newdecl);
979 /* Check for function type mismatch
980 involving an empty arglist vs a nonempty one. */
981 if (TREE_CODE (olddecl) == FUNCTION_DECL
982 && comptypes (TREE_TYPE (oldtype),
983 TREE_TYPE (newtype), comptype_flags)
984 && ((TYPE_ARG_TYPES (oldtype) == 0
985 && DECL_INITIAL (olddecl) == 0)
987 (TYPE_ARG_TYPES (newtype) == 0
988 && DECL_INITIAL (newdecl) == 0)))
990 /* Classify the problem further. */
991 tree t = TYPE_ARG_TYPES (oldtype);
993 t = TYPE_ARG_TYPES (newtype);
994 for (; t; t = TREE_CHAIN (t))
996 tree type = TREE_VALUE (t);
998 if (TREE_CHAIN (t) == 0
999 && TYPE_MAIN_VARIANT (type) != void_type_node)
1001 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1005 if (c_type_promotes_to (type) != type)
1007 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1012 if (C_DECL_IMPLICIT (olddecl))
1013 error ("%Hprevious implicit declaration of '%D'",
1014 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1016 error ("%Hprevious declaration of '%D'",
1017 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1019 /* This is safer because the initializer might contain references
1020 to variables that were declared between olddecl and newdecl. This
1021 will make the initializer invalid for olddecl in case it gets
1022 assigned to olddecl below. */
1023 if (TREE_CODE (newdecl) == VAR_DECL)
1024 DECL_INITIAL (newdecl) = 0;
1026 /* TLS cannot follow non-TLS declaration. */
1027 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1028 && !DECL_THREAD_LOCAL (olddecl) && DECL_THREAD_LOCAL (newdecl))
1030 error ("%Hthread-local declaration of '%D' follows non thread-local "
1031 "declaration", &DECL_SOURCE_LOCATION (newdecl), newdecl);
1032 error ("%Hprevious declaration of '%D'",
1033 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1035 /* non-TLS declaration cannot follow TLS declaration. */
1036 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1037 && DECL_THREAD_LOCAL (olddecl) && !DECL_THREAD_LOCAL (newdecl))
1039 error ("%Hnon thread-local declaration of '%D' follows "
1040 "thread-local declaration",
1041 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1042 error ("%Hprevious declaration of '%D'",
1043 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1047 errmsg = redeclaration_error_message (newdecl, olddecl);
1050 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1054 error ("%Hredefinition of '%D'", locus, newdecl);
1057 error ("%Hredeclaration of '%D'", locus, newdecl);
1060 error ("%Hconflicting declarations of '%D'", locus, newdecl);
1066 locus = &DECL_SOURCE_LOCATION (olddecl);
1067 if (DECL_INITIAL (olddecl)
1068 && current_scope == global_scope)
1069 error ("%H'%D' previously defined here", locus, olddecl);
1071 error ("%H'%D' previously declared here", locus, olddecl);
1074 else if (TREE_CODE (newdecl) == TYPE_DECL
1075 && (DECL_IN_SYSTEM_HEADER (olddecl)
1076 || DECL_IN_SYSTEM_HEADER (newdecl)))
1078 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1079 warning ("%Hredefinition of '%D'", locus, newdecl);
1080 locus = &DECL_SOURCE_LOCATION (olddecl);
1081 if (DECL_INITIAL (olddecl)
1082 && current_scope == global_scope)
1083 warning ("%H'%D' previously defined here", locus, olddecl);
1085 warning ("%H'%D' previously declared here", locus, olddecl);
1087 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1088 && DECL_INITIAL (olddecl) != 0
1089 && TYPE_ARG_TYPES (oldtype) == 0
1090 && TYPE_ARG_TYPES (newtype) != 0
1091 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1095 /* Prototype decl follows defn w/o prototype. */
1097 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1098 type = TYPE_ARG_TYPES (newtype),
1101 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1103 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1104 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1106 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1107 warning ("%Hprototype for '%D' follows", locus, newdecl);
1108 locus = &DECL_SOURCE_LOCATION (olddecl);
1109 warning ("%Hnon-prototype definition here", locus);
1112 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1113 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1115 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1116 error ("%Hprototype for '%D' follows and number of "
1117 "arguments doesn't match", locus, newdecl);
1118 locus = &DECL_SOURCE_LOCATION (olddecl);
1119 error ("%Hnon-prototype definition here", locus);
1123 /* Type for passing arg must be consistent
1124 with that declared for the arg. */
1125 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type),
1128 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1129 error ("%Hprototype for '%D' follows and argument %d "
1130 "doesn't match", locus, newdecl, nargs);
1131 locus = &DECL_SOURCE_LOCATION (olddecl);
1132 error ("%Hnon-prototype definition here", locus);
1138 /* Warn about mismatches in various flags. */
1141 /* Warn if function is now inline
1142 but was previously declared not inline and has been called. */
1143 if (TREE_CODE (olddecl) == FUNCTION_DECL
1144 && ! DECL_DECLARED_INLINE_P (olddecl)
1145 && DECL_DECLARED_INLINE_P (newdecl)
1146 && TREE_USED (olddecl))
1147 warning ("%H'%D' declared inline after being called",
1148 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1149 if (TREE_CODE (olddecl) == FUNCTION_DECL
1150 && ! DECL_DECLARED_INLINE_P (olddecl)
1151 && DECL_DECLARED_INLINE_P (newdecl)
1152 && DECL_INITIAL (olddecl) != 0)
1153 warning ("%H'%D' declared inline after its definition",
1154 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1156 /* If pedantic, warn when static declaration follows a non-static
1157 declaration. Otherwise, do so only for functions. */
1158 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1159 && TREE_PUBLIC (olddecl)
1160 && !TREE_PUBLIC (newdecl))
1161 warning ("%Hstatic declaration for '%D' follows non-static",
1162 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1164 /* If warn_traditional, warn when a non-static function
1165 declaration follows a static one. */
1166 if (warn_traditional && !in_system_header
1167 && TREE_CODE (olddecl) == FUNCTION_DECL
1168 && !TREE_PUBLIC (olddecl)
1169 && TREE_PUBLIC (newdecl))
1170 warning ("%Hnon-static declaration for '%D' follows static",
1171 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1173 /* Warn when const declaration follows a non-const
1174 declaration, but not for functions. */
1175 if (TREE_CODE (olddecl) != FUNCTION_DECL
1176 && !TREE_READONLY (olddecl)
1177 && TREE_READONLY (newdecl))
1178 warning ("%Hconst declaration for '%D' follows non-const",
1179 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1180 /* These bits are logically part of the type, for variables.
1181 But not for functions
1182 (where qualifiers are not valid ANSI anyway). */
1183 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1184 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1185 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1186 pedwarn ("%Htype qualifiers for '%D' conflict with previous "
1187 "declaration", &DECL_SOURCE_LOCATION (newdecl), newdecl);
1191 /* Optionally warn about more than one declaration for the same name. */
1192 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1193 /* Don't warn about a function declaration
1194 followed by a definition. */
1195 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1196 && DECL_INITIAL (olddecl) == 0)
1197 /* Don't warn about extern decl followed by (tentative) definition. */
1198 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1200 warning ("%Hredundant redeclaration of '%D' in same scope",
1201 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1202 warning ("%Hprevious declaration of '%D'",
1203 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1206 /* Copy all the DECL_... slots specified in the new decl
1207 except for any that we copy here from the old type.
1209 Past this point, we don't change OLDTYPE and NEWTYPE
1210 even if we change the types of NEWDECL and OLDDECL. */
1214 /* When copying info to olddecl, we store into write_olddecl
1215 instead. This allows us to avoid modifying olddecl when
1216 different_binding_level is true. */
1217 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1219 /* Merge the data types specified in the two decls. */
1220 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1222 if (different_binding_level)
1224 if (TYPE_ARG_TYPES (oldtype) != 0
1225 && TYPE_ARG_TYPES (newtype) == 0)
1226 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1229 = build_type_attribute_variant
1231 merge_attributes (TYPE_ATTRIBUTES (newtype),
1232 TYPE_ATTRIBUTES (oldtype)));
1236 = TREE_TYPE (olddecl)
1237 = common_type (newtype, oldtype);
1240 /* Lay the type out, unless already done. */
1241 if (oldtype != TREE_TYPE (newdecl))
1243 if (TREE_TYPE (newdecl) != error_mark_node)
1244 layout_type (TREE_TYPE (newdecl));
1245 if (TREE_CODE (newdecl) != FUNCTION_DECL
1246 && TREE_CODE (newdecl) != TYPE_DECL
1247 && TREE_CODE (newdecl) != CONST_DECL)
1248 layout_decl (newdecl, 0);
1252 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1253 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1254 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1255 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1256 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1257 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1259 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1260 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1264 /* Keep the old rtl since we can safely use it. */
1265 COPY_DECL_RTL (olddecl, newdecl);
1267 /* Merge the type qualifiers. */
1268 if (TREE_READONLY (newdecl))
1269 TREE_READONLY (write_olddecl) = 1;
1271 if (TREE_THIS_VOLATILE (newdecl))
1273 TREE_THIS_VOLATILE (write_olddecl) = 1;
1274 if (TREE_CODE (newdecl) == VAR_DECL
1275 /* If an automatic variable is re-declared in the same
1276 function scope, but the old declaration was not
1277 volatile, make_var_volatile() would crash because the
1278 variable would have been assigned to a pseudo, not a
1279 MEM. Since this duplicate declaration is invalid
1280 anyway, we just skip the call. */
1282 make_var_volatile (newdecl);
1285 /* Keep source location of definition rather than declaration. */
1286 /* When called with different_binding_level set, keep the old
1287 information so that meaningful diagnostics can be given. */
1288 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1289 && ! different_binding_level)
1291 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1292 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1295 /* Merge the unused-warning information. */
1296 if (DECL_IN_SYSTEM_HEADER (olddecl))
1297 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1298 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1299 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1301 /* Merge the initialization information. */
1302 /* When called with different_binding_level set, don't copy over
1303 DECL_INITIAL, so that we don't accidentally change function
1304 declarations into function definitions. */
1305 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1306 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1308 /* Merge the section attribute.
1309 We want to issue an error if the sections conflict but that must be
1310 done later in decl_attributes since we are called before attributes
1312 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1313 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1315 /* Copy the assembler name.
1316 Currently, it can only be defined in the prototype. */
1317 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1319 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1321 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1322 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1323 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1324 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1325 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1326 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1327 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1328 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1329 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1332 /* If cannot merge, then use the new type and qualifiers,
1333 and don't preserve the old rtl. */
1334 else if (! different_binding_level)
1336 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1337 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1338 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1339 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1342 /* Merge the storage class information. */
1343 merge_weak (newdecl, olddecl);
1345 /* For functions, static overrides non-static. */
1346 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1348 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1349 /* This is since we don't automatically
1350 copy the attributes of NEWDECL into OLDDECL. */
1351 /* No need to worry about different_binding_level here because
1352 then TREE_PUBLIC (newdecl) was true. */
1353 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1354 /* If this clears `static', clear it in the identifier too. */
1355 if (! TREE_PUBLIC (olddecl))
1356 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1358 if (DECL_EXTERNAL (newdecl))
1360 if (! different_binding_level || different_tu)
1362 /* Don't mess with these flags on local externs; they remain
1363 external even if there's a declaration at file scope which
1365 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1366 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1368 /* An extern decl does not override previous storage class. */
1369 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1370 if (! DECL_EXTERNAL (newdecl))
1372 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1373 /* If we have two non-EXTERNAL file-scope decls that are
1374 the same, only one of them should be written out. */
1376 TREE_ASM_WRITTEN (newdecl) = 1;
1381 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1382 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1385 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1387 /* If we're redefining a function previously defined as extern
1388 inline, make sure we emit debug info for the inline before we
1389 throw it away, in case it was inlined into a function that hasn't
1390 been written out yet. */
1391 if (new_is_definition && DECL_INITIAL (olddecl))
1393 if (TREE_USED (olddecl))
1394 (*debug_hooks->outlining_inline_function) (olddecl);
1396 /* The new defn must not be inline. */
1397 DECL_INLINE (newdecl) = 0;
1398 DECL_UNINLINABLE (newdecl) = 1;
1402 /* If either decl says `inline', this fn is inline,
1403 unless its definition was passed already. */
1404 if (DECL_DECLARED_INLINE_P (newdecl)
1405 || DECL_DECLARED_INLINE_P (olddecl))
1406 DECL_DECLARED_INLINE_P (newdecl) = 1;
1408 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1409 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1412 if (DECL_BUILT_IN (olddecl))
1414 /* Get rid of any built-in function if new arg types don't match it
1415 or if we have a function definition. */
1416 if (! types_match || new_is_definition)
1418 if (! different_binding_level)
1420 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1421 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1426 /* If redeclaring a builtin function, and not a definition,
1427 it stays built in. */
1428 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1429 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1433 /* Also preserve various other info from the definition. */
1434 if (! new_is_definition)
1436 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1437 /* When called with different_binding_level set, don't copy over
1438 DECL_INITIAL, so that we don't accidentally change function
1439 declarations into function definitions. */
1440 if (! different_binding_level)
1441 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1442 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1443 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1444 DECL_ESTIMATED_INSNS (newdecl) = DECL_ESTIMATED_INSNS (olddecl);
1445 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1447 /* Set DECL_INLINE on the declaration if we've got a body
1448 from which to instantiate. */
1449 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1451 DECL_INLINE (newdecl) = 1;
1452 DECL_ABSTRACT_ORIGIN (newdecl)
1453 = (different_binding_level
1454 ? DECL_ORIGIN (olddecl)
1455 : DECL_ABSTRACT_ORIGIN (olddecl));
1460 /* If a previous declaration said inline, mark the
1461 definition as inlinable. */
1462 if (DECL_DECLARED_INLINE_P (newdecl)
1463 && ! DECL_UNINLINABLE (newdecl))
1464 DECL_INLINE (newdecl) = 1;
1467 if (different_binding_level)
1470 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1471 But preserve OLDDECL's DECL_UID. */
1473 unsigned olddecl_uid = DECL_UID (olddecl);
1475 memcpy ((char *) olddecl + sizeof (struct tree_common),
1476 (char *) newdecl + sizeof (struct tree_common),
1477 sizeof (struct tree_decl) - sizeof (struct tree_common));
1478 DECL_UID (olddecl) = olddecl_uid;
1481 /* NEWDECL contains the merged attribute lists.
1482 Update OLDDECL to be the same. */
1483 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1485 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1486 so that encode_section_info has a chance to look at the new decl
1487 flags and attributes. */
1488 if (DECL_RTL_SET_P (olddecl)
1489 && (TREE_CODE (olddecl) == FUNCTION_DECL
1490 || (TREE_CODE (olddecl) == VAR_DECL
1491 && TREE_STATIC (olddecl))))
1492 make_decl_rtl (olddecl, NULL);
1497 /* Return any external DECL associated with ID, whether or not it is
1498 currently in scope. */
1501 any_external_decl (tree id)
1503 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1506 if (decl == 0 || TREE_CODE (decl) == ERROR_MARK)
1508 else if (TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1511 t = purpose_member (id, truly_local_externals);
1513 return TREE_VALUE (t);
1518 /* Record an external decl DECL. This only does something if a
1519 shadowing decl already exists. */
1521 record_external_decl (tree decl)
1523 tree name = DECL_NAME (decl);
1524 if (!IDENTIFIER_SYMBOL_VALUE (name))
1527 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1530 /* Check whether decl-node X shadows an existing declaration.
1531 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1532 which might be a NULL_TREE. */
1534 warn_if_shadowing (tree x, tree old)
1538 /* Nothing to shadow? */
1540 /* Shadow warnings not wanted? */
1542 /* No shadow warnings for internally generated vars. */
1543 || DECL_SOURCE_LINE (x) == 0
1544 /* No shadow warnings for vars made for inlining. */
1545 || DECL_FROM_INLINE (x)
1546 /* Don't warn about the parm names in function declarator
1547 within a function declarator.
1548 It would be nice to avoid warning in any function
1549 declarator in a declaration, as opposed to a definition,
1550 but there is no way to tell it's not a definition. */
1551 || (TREE_CODE (x) == PARM_DECL
1552 && current_scope->outer->parm_flag))
1555 name = IDENTIFIER_POINTER (DECL_NAME (x));
1557 if (TREE_CODE (old) == PARM_DECL)
1558 shadow_warning (SW_PARAM, name, old);
1559 else if (C_DECL_FILE_SCOPE (old))
1560 shadow_warning (SW_GLOBAL, name, old);
1562 shadow_warning (SW_LOCAL, name, old);
1566 /* Subroutine of pushdecl.
1568 X is a TYPE_DECL for a typedef statement. Create a brand new
1569 ..._TYPE node (which will be just a variant of the existing
1570 ..._TYPE node with identical properties) and then install X
1571 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1573 The whole point here is to end up with a situation where each
1574 and every ..._TYPE node the compiler creates will be uniquely
1575 associated with AT MOST one node representing a typedef name.
1576 This way, even though the compiler substitutes corresponding
1577 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1578 early on, later parts of the compiler can always do the reverse
1579 translation and get back the corresponding typedef name. For
1582 typedef struct S MY_TYPE;
1585 Later parts of the compiler might only know that `object' was of
1586 type `struct S' if it were not for code just below. With this
1587 code however, later parts of the compiler see something like:
1589 struct S' == struct S
1590 typedef struct S' MY_TYPE;
1593 And they can then deduce (from the node for type struct S') that
1594 the original object declaration was:
1598 Being able to do this is important for proper support of protoize,
1599 and also for generating precise symbolic debugging information
1600 which takes full account of the programmer's (typedef) vocabulary.
1602 Obviously, we don't want to generate a duplicate ..._TYPE node if
1603 the TYPE_DECL node that we are now processing really represents a
1604 standard built-in type.
1606 Since all standard types are effectively declared at line zero
1607 in the source file, we can easily check to see if we are working
1608 on a standard type by checking the current value of lineno. */
1611 clone_underlying_type (tree x)
1613 if (DECL_SOURCE_LINE (x) == 0)
1615 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1616 TYPE_NAME (TREE_TYPE (x)) = x;
1618 else if (TREE_TYPE (x) != error_mark_node
1619 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1621 tree tt = TREE_TYPE (x);
1622 DECL_ORIGINAL_TYPE (x) = tt;
1623 tt = build_type_copy (tt);
1625 TREE_USED (tt) = TREE_USED (x);
1630 /* Record a decl-node X as belonging to the current lexical scope.
1631 Check for errors (such as an incompatible declaration for the same
1632 name already seen in the same scope).
1634 Returns either X or an old decl for the same name.
1635 If an old decl is returned, it may have been smashed
1636 to agree with what X says. */
1641 tree name = DECL_NAME (x);
1642 struct c_scope *scope = current_scope;
1644 #ifdef ENABLE_CHECKING
1645 if (error_mark_node == 0)
1646 /* Called too early. */
1650 /* Functions need the lang_decl data. */
1651 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1652 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1654 /* A local extern declaration for a function doesn't constitute nesting.
1655 A local auto declaration does, since it's a forward decl
1656 for a nested function coming later. */
1657 if (current_function_decl == NULL
1658 || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1659 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
1660 DECL_CONTEXT (x) = current_file_decl;
1662 DECL_CONTEXT (x) = current_function_decl;
1668 if (warn_nested_externs
1669 && scope != global_scope
1670 && DECL_EXTERNAL (x)
1671 && !DECL_IN_SYSTEM_HEADER (x))
1672 warning ("nested extern declaration of `%s'",
1673 IDENTIFIER_POINTER (name));
1675 old = lookup_name_current_level (name);
1676 if (old && duplicate_decls (x, old, 0, false))
1678 if (DECL_EXTERNAL (x) || scope == global_scope)
1680 /* Find and check against a previous, not-in-scope, external
1681 decl for this identifier. (C99 s???: If two declarations
1682 with external linkage, referring to the same object, have
1683 incompatible types, the behavior is undefined). */
1684 tree ext = any_external_decl (name);
1687 if (duplicate_decls (x, ext, scope != global_scope,
1689 x = copy_node (ext);
1692 record_external_decl (x);
1695 if (TREE_CODE (x) == TYPE_DECL)
1696 clone_underlying_type (x);
1698 /* If storing a local value, there may already be one
1699 (inherited). If so, record it for restoration when this
1700 scope ends. Take care not to do this if we are replacing an
1701 older decl in the same scope (i.e. duplicate_decls returned
1703 if (scope != global_scope
1704 && IDENTIFIER_SYMBOL_VALUE (name)
1705 && IDENTIFIER_SYMBOL_VALUE (name) != old)
1707 warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
1708 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1712 /* Install the new declaration in the requested scope. */
1713 IDENTIFIER_SYMBOL_VALUE (name) = x;
1714 C_DECL_INVISIBLE (x) = 0;
1716 /* Keep list of variables in this scope with incomplete type.
1717 If the input is erroneous, we can have error_mark in the type
1718 slot (e.g. "f(void a, ...)") - that doesn't count as an
1720 if (TREE_TYPE (x) != error_mark_node
1721 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1723 tree element = TREE_TYPE (x);
1725 while (TREE_CODE (element) == ARRAY_TYPE)
1726 element = TREE_TYPE (element);
1727 if (TREE_CODE (element) == RECORD_TYPE
1728 || TREE_CODE (element) == UNION_TYPE)
1729 scope->incomplete_list = tree_cons (NULL_TREE, x,
1730 scope->incomplete_list);
1734 /* Put decls on list in reverse order.
1735 We will reverse them later if necessary. */
1736 TREE_CHAIN (x) = scope->names;
1742 /* Record X as belonging to the global scope (C99 "file scope").
1743 This is used only internally by the Objective-C front end,
1744 and is limited to its needs. It will hork if there is _any_
1745 visible binding for X (not just a global one). */
1747 pushdecl_top_level (tree x)
1751 if (TREE_CODE (x) != VAR_DECL)
1754 name = DECL_NAME (x);
1755 old = IDENTIFIER_SYMBOL_VALUE (name);
1759 if (DECL_CONTEXT (old))
1762 if (!duplicate_decls (x, old, 0, false))
1768 DECL_CONTEXT (x) = current_file_decl;
1769 IDENTIFIER_SYMBOL_VALUE (name) = x;
1770 TREE_CHAIN (x) = global_scope->names;
1771 global_scope->names = x;
1775 /* Record X as belonging to the outermost scope of the current
1776 function. This is used only internally, by c_make_fname_decl and
1777 undeclared_variable, and is limited to their needs. The NAME is
1778 provided as a separate argument because undeclared_variable wants to
1779 use error_mark_node for X. For VAR_DECLs, duplicate_decls is not
1780 called; if there is any preexisting decl for this identifier, it is
1783 pushdecl_function_level (tree x, tree name)
1785 struct c_scope *scope = current_function_scope;
1787 if (x == error_mark_node)
1788 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1790 else if (TREE_CODE (x) == VAR_DECL)
1792 if (name != DECL_NAME (x))
1794 if (IDENTIFIER_SYMBOL_VALUE (name))
1797 DECL_CONTEXT (x) = current_function_decl;
1798 TREE_CHAIN (x) = scope->names;
1802 IDENTIFIER_SYMBOL_VALUE (name) = x;
1805 /* Generate an implicit declaration for identifier FUNCTIONID as a
1806 function of type int (). */
1809 implicitly_declare (tree functionid)
1811 tree decl = any_external_decl (functionid);
1813 if (decl && decl != error_mark_node)
1815 /* Implicit declaration of a function already declared
1816 (somehow) in a different scope, or as a built-in.
1817 If this is the first time this has happened, warn;
1818 then recycle the old declaration. */
1819 if (!C_DECL_IMPLICIT (decl))
1821 implicit_decl_warning (DECL_NAME (decl));
1822 if (! C_DECL_FILE_SCOPE (decl))
1823 warning ("%Hprevious declaration of '%D'",
1824 &DECL_SOURCE_LOCATION (decl), decl);
1825 C_DECL_IMPLICIT (decl) = 1;
1827 /* If this function is global, then it must already be in the
1828 global scope, so there's no need to push it again. */
1829 if (current_scope == global_scope)
1831 /* If this is a local declaration, make a copy; we can't have
1832 the same DECL listed in two different scopes. */
1833 return pushdecl (copy_node (decl));
1836 /* Not seen before. */
1837 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1838 DECL_EXTERNAL (decl) = 1;
1839 TREE_PUBLIC (decl) = 1;
1840 C_DECL_IMPLICIT (decl) = 1;
1841 implicit_decl_warning (functionid);
1843 /* ANSI standard says implicit declarations are in the innermost block.
1844 So we record the decl in the standard fashion. */
1845 decl = pushdecl (decl);
1847 /* No need to call objc_check_decl here - it's a function type. */
1848 rest_of_decl_compilation (decl, NULL, 0, 0);
1850 /* Write a record describing this implicit function declaration to the
1851 prototypes file (if requested). */
1853 gen_aux_info_record (decl, 0, 1, 0);
1855 /* Possibly apply some default attributes to this implicit declaration. */
1856 decl_attributes (&decl, NULL_TREE, 0);
1862 implicit_decl_warning (tree id)
1864 const char *name = IDENTIFIER_POINTER (id);
1865 if (mesg_implicit_function_declaration == 2)
1866 error ("implicit declaration of function `%s'", name);
1867 else if (mesg_implicit_function_declaration == 1)
1868 warning ("implicit declaration of function `%s'", name);
1871 /* Return zero if the declaration NEWDECL is valid
1872 when the declaration OLDDECL (assumed to be for the same name)
1873 has already been seen.
1874 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
1875 and 3 if it is a conflicting declaration. */
1878 redeclaration_error_message (tree newdecl, tree olddecl)
1880 if (TREE_CODE (newdecl) == TYPE_DECL)
1882 /* Do not complain about type redeclarations where at least one
1883 declaration was in a system header. */
1884 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
1888 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1890 /* Declarations of functions can insist on internal linkage
1891 but they can't be inconsistent with internal linkage,
1892 so there can be no error on that account.
1893 However defining the same name twice is no good. */
1894 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
1895 /* However, defining once as extern inline and a second
1896 time in another way is ok. */
1897 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
1898 && ! (DECL_DECLARED_INLINE_P (newdecl)
1899 && DECL_EXTERNAL (newdecl))))
1903 else if (C_DECL_FILE_SCOPE (newdecl))
1905 /* Objects declared at file scope: */
1906 /* If at least one is a reference, it's ok. */
1907 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
1909 /* Reject two definitions. */
1910 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
1912 /* Now we have two tentative defs, or one tentative and one real def. */
1913 /* Insist that the linkage match. */
1914 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
1918 else if (current_scope->parm_flag
1919 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1923 /* Newdecl has block scope. If olddecl has block scope also, then
1924 reject two definitions, and reject a definition together with an
1925 external reference. Otherwise, it is OK, because newdecl must
1926 be an extern reference to olddecl. */
1927 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
1928 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
1934 /* Issue an error message for a reference to an undeclared variable
1935 ID, including a reference to a builtin outside of function-call
1936 context. Establish a binding of the identifier to error_mark_node
1937 in an appropriate scope, which will suppress further errors for the
1940 undeclared_variable (tree id)
1942 static bool already = false;
1944 if (current_function_decl == 0)
1946 error ("`%s' undeclared here (not in a function)",
1947 IDENTIFIER_POINTER (id));
1948 IDENTIFIER_SYMBOL_VALUE (id) = error_mark_node;
1952 error ("`%s' undeclared (first use in this function)",
1953 IDENTIFIER_POINTER (id));
1957 error ("(Each undeclared identifier is reported only once");
1958 error ("for each function it appears in.)");
1962 pushdecl_function_level (error_mark_node, id);
1966 /* Subroutine of lookup_label, declare_label, define_label: construct a
1967 LABEL_DECL with all the proper frills. */
1970 make_label (tree name, location_t location)
1972 tree label = build_decl (LABEL_DECL, name, void_type_node);
1974 DECL_CONTEXT (label) = current_function_decl;
1975 DECL_MODE (label) = VOIDmode;
1976 DECL_SOURCE_LOCATION (label) = location;
1981 /* Another subroutine of lookup_label, declare_label, define_label:
1982 set up the binding of name to LABEL_DECL in the given SCOPE. */
1985 bind_label (tree name, tree label, struct c_scope *scope)
1987 if (IDENTIFIER_LABEL_VALUE (name))
1988 scope->shadowed = tree_cons (name, IDENTIFIER_LABEL_VALUE (name),
1990 IDENTIFIER_LABEL_VALUE (name) = label;
1992 TREE_CHAIN (label) = scope->names;
1993 scope->names = label;
1996 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
1997 Create one if none exists so far for the current function.
1998 This is called when a label is used in a goto expression or
1999 has its address taken. */
2002 lookup_label (tree name)
2006 if (current_function_decl == 0)
2008 error ("label %s referenced outside of any function",
2009 IDENTIFIER_POINTER (name));
2013 /* Use a label already defined or ref'd with this name, but not if
2014 it is inherited from a containing function and wasn't declared
2016 label = IDENTIFIER_LABEL_VALUE (name);
2017 if (label && (DECL_CONTEXT (label) == current_function_decl
2018 || C_DECLARED_LABEL_FLAG (label)))
2020 /* If the label has only been declared, update its apparent
2021 location to point here, for better diagnostics if it
2022 turns out not to have been defined. */
2023 if (!TREE_USED (label))
2024 DECL_SOURCE_LOCATION (label) = input_location;
2028 /* No label binding for that identifier; make one. */
2029 label = make_label (name, input_location);
2031 /* Ordinary labels go in the current function scope, which is
2032 not necessarily the current label scope. */
2033 bind_label (name, label, current_function_scope);
2037 /* Make a label named NAME in the current function, shadowing silently
2038 any that may be inherited from containing functions or containing
2039 scopes. This is called for __label__ declarations. */
2041 /* Note that valid use, if the label being shadowed comes from another
2042 scope in the same function, requires calling declare_nonlocal_label
2043 right away. (Is this still true? -zw 2003-07-17) */
2046 declare_label (tree name)
2048 tree label = IDENTIFIER_LABEL_VALUE (name);
2051 /* Check to make sure that the label hasn't already been declared
2053 for (dup = current_scope->names; dup; dup = TREE_CHAIN (dup))
2056 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2057 error ("%Hthis is a previous declaration",
2058 &DECL_SOURCE_LOCATION (dup));
2060 /* Just use the previous declaration. */
2064 label = make_label (name, input_location);
2065 C_DECLARED_LABEL_FLAG (label) = 1;
2067 /* Declared labels go in the current scope. */
2068 bind_label (name, label, current_scope);
2072 /* Define a label, specifying the location in the source file.
2073 Return the LABEL_DECL node for the label, if the definition is valid.
2074 Otherwise return 0. */
2077 define_label (location_t location, tree name)
2081 /* Find any preexisting label with this name. It is an error
2082 if that label has already been defined in this function, or
2083 if there is a containing function with a declared label with
2085 label = IDENTIFIER_LABEL_VALUE (name);
2088 && ((DECL_CONTEXT (label) == current_function_decl
2089 && DECL_INITIAL (label) != 0)
2090 || (DECL_CONTEXT (label) != current_function_decl
2091 && C_DECLARED_LABEL_FLAG (label))))
2093 error ("%Hduplicate label `%D'", &location, label);
2094 if (DECL_INITIAL (label))
2095 error ("%H`%D' previously defined here",
2096 &DECL_SOURCE_LOCATION (label), label);
2098 error ("%H`%D' previously declared here",
2099 &DECL_SOURCE_LOCATION (label), label);
2102 else if (label && DECL_CONTEXT (label) == current_function_decl)
2104 /* The label has been used or declared already in this function,
2105 but not defined. Update its location to point to this
2107 DECL_SOURCE_LOCATION (label) = location;
2111 /* No label binding for that identifier; make one. */
2112 label = make_label (name, location);
2114 /* Ordinary labels go in the current function scope, which is
2115 not necessarily the current label scope. */
2116 bind_label (name, label, current_function_scope);
2119 if (warn_traditional && !in_system_header && lookup_name (name))
2120 warning ("%Htraditional C lacks a separate namespace for labels, "
2121 "identifier `%s' conflicts", &location,
2122 IDENTIFIER_POINTER (name));
2124 /* Mark label as having been defined. */
2125 DECL_INITIAL (label) = error_mark_node;
2129 /* Return the list of declarations of the current scope.
2130 Note that this list is in reverse order unless/until
2131 you nreverse it; and when you do nreverse it, you must
2132 store the result back using `storedecls' or you will lose. */
2137 return current_scope->names;
2140 /* Return the list of type-tags (for structs, etc) of the current scope. */
2145 return current_scope->tags;
2148 /* Store the list of declarations of the current scope.
2149 This is done for the parameter declarations of a function being defined,
2150 after they are modified in the light of any missing parameters. */
2153 storedecls (tree decls)
2155 current_scope->names = decls;
2158 /* Similarly, store the list of tags of the current scope. */
2161 storetags (tree tags)
2163 current_scope->tags = tags;
2166 /* Given NAME, an IDENTIFIER_NODE,
2167 return the structure (or union or enum) definition for that name.
2168 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2169 CODE says which kind of type the caller wants;
2170 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2171 If the wrong kind of type is found, an error is reported. */
2174 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2176 tree tag = IDENTIFIER_TAG_VALUE (name);
2182 /* We only care about whether it's in this level if
2183 thislevel_only was set or it might be a type clash. */
2184 if (thislevel_only || TREE_CODE (tag) != code)
2186 if (current_scope == global_scope
2187 || purpose_member (name, current_scope->tags))
2191 if (thislevel_only && !thislevel)
2194 if (TREE_CODE (tag) != code)
2196 /* Definition isn't the kind we were looking for. */
2197 pending_invalid_xref = name;
2198 pending_invalid_xref_location = input_location;
2200 /* If in the same binding level as a declaration as a tag
2201 of a different type, this must not be allowed to
2202 shadow that tag, so give the error immediately.
2203 (For example, "struct foo; union foo;" is invalid.) */
2205 pending_xref_error ();
2210 /* Print an error message now
2211 for a recent invalid struct, union or enum cross reference.
2212 We don't print them immediately because they are not invalid
2213 when used in the `struct foo;' construct for shadowing. */
2216 pending_xref_error (void)
2218 if (pending_invalid_xref != 0)
2219 error ("%H`%s' defined as wrong kind of tag",
2220 &pending_invalid_xref_location,
2221 IDENTIFIER_POINTER (pending_invalid_xref));
2222 pending_invalid_xref = 0;
2226 /* Look up NAME in the current scope and its superiors
2227 in the namespace of variables, functions and typedefs.
2228 Return a ..._DECL node of some kind representing its definition,
2229 or return 0 if it is undefined. */
2232 lookup_name (tree name)
2234 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2235 if (decl == 0 || decl == error_mark_node)
2237 if (C_DECL_INVISIBLE (decl))
2242 /* Similar to `lookup_name' but look only at the current scope. */
2245 lookup_name_current_level (tree name)
2247 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2249 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2252 if (current_scope == global_scope)
2255 /* Scan the current scope for a decl with name NAME. */
2256 if (chain_member (decl, current_scope->names))
2262 /* Create the predefined scalar types of C,
2263 and some nodes representing standard constants (0, 1, (void *) 0).
2264 Initialize the global scope.
2265 Make definitions for built-in primitive functions. */
2268 c_init_decl_processing (void)
2271 tree ptr_ftype_void, ptr_ftype_ptr;
2272 location_t save_loc = input_location;
2274 /* Adds some ggc roots, and reserved words for c-parse.in. */
2277 current_function_decl = NULL;
2278 current_scope = NULL;
2279 current_function_scope = NULL;
2280 scope_freelist = NULL;
2282 /* Make the c_scope structure for global names. */
2284 global_scope = current_scope;
2285 /* Declarations from c_common_nodes_and_builtins must not be associated
2286 with this input file, lest we get differences between using and not
2287 using preprocessed headers. */
2288 input_location.file = "<internal>";
2289 input_location.line = 0;
2291 /* Make the DECL for the toplevel file scope. */
2292 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
2294 build_common_tree_nodes (flag_signed_char);
2296 c_common_nodes_and_builtins ();
2298 boolean_type_node = integer_type_node;
2299 boolean_true_node = integer_one_node;
2300 boolean_false_node = integer_zero_node;
2302 c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
2303 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2304 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2305 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2306 TYPE_PRECISION (c_bool_type_node) = 1;
2307 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2309 c_bool_false_node = build_int_2 (0, 0);
2310 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2311 c_bool_true_node = build_int_2 (1, 0);
2312 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2314 endlink = void_list_node;
2315 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2317 = build_function_type (ptr_type_node,
2318 tree_cons (NULL_TREE, ptr_type_node, endlink));
2320 input_location = save_loc;
2322 pedantic_lvalues = pedantic;
2324 make_fname_decl = c_make_fname_decl;
2325 start_fname_decls ();
2327 builtin_decls = global_scope->names;
2330 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2331 decl, NAME is the initialization string and TYPE_DEP indicates whether
2332 NAME depended on the type of the function. As we don't yet implement
2333 delayed emission of static data, we mark the decl as emitted
2334 so it is not placed in the output. Anything using it must therefore pull
2335 out the STRING_CST initializer directly. This does mean that these names
2336 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2339 c_make_fname_decl (tree id, int type_dep)
2341 const char *name = fname_as_string (type_dep);
2342 tree decl, type, init;
2343 size_t length = strlen (name);
2345 type = build_array_type
2346 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2347 build_index_type (size_int (length)));
2349 decl = build_decl (VAR_DECL, id, type);
2351 TREE_STATIC (decl) = 1;
2352 TREE_READONLY (decl) = 1;
2353 DECL_ARTIFICIAL (decl) = 1;
2355 init = build_string (length + 1, name);
2356 TREE_TYPE (init) = type;
2357 DECL_INITIAL (decl) = init;
2359 TREE_USED (decl) = 1;
2361 if (current_function_decl)
2362 pushdecl_function_level (decl, DECL_NAME (decl));
2364 finish_decl (decl, init, NULL_TREE);
2369 /* Return a definition for a builtin function named NAME and whose data type
2370 is TYPE. TYPE should be a function type with argument types.
2371 FUNCTION_CODE tells later passes how to compile calls to this function.
2372 See tree.h for its possible values.
2374 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2375 the name to be called if we can't opencode the function. If
2376 ATTRS is nonzero, use that for the function's attribute list. */
2379 builtin_function (const char *name, tree type, int function_code,
2380 enum built_in_class class, const char *library_name,
2383 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2384 DECL_EXTERNAL (decl) = 1;
2385 TREE_PUBLIC (decl) = 1;
2387 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2388 make_decl_rtl (decl, NULL);
2390 DECL_BUILT_IN_CLASS (decl) = class;
2391 DECL_FUNCTION_CODE (decl) = function_code;
2393 /* Warn if a function in the namespace for users
2394 is used without an occasion to consider it declared. */
2395 if (name[0] != '_' || name[1] != '_')
2396 C_DECL_INVISIBLE (decl) = 1;
2398 /* Possibly apply some default attributes to this built-in function. */
2400 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2402 decl_attributes (&decl, NULL_TREE, 0);
2407 /* Apply default attributes to a function, if a system function with default
2411 c_insert_default_attributes (tree decl)
2413 if (!TREE_PUBLIC (decl))
2415 c_common_insert_default_attributes (decl);
2418 /* Called when a declaration is seen that contains no names to declare.
2419 If its type is a reference to a structure, union or enum inherited
2420 from a containing scope, shadow that tag name for the current scope
2421 with a forward reference.
2422 If its type defines a new named structure or union
2423 or defines an enum, it is valid but we need not do anything here.
2424 Otherwise, it is an error. */
2427 shadow_tag (tree declspecs)
2429 shadow_tag_warned (declspecs, 0);
2433 shadow_tag_warned (tree declspecs, int warned)
2436 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2443 pending_invalid_xref = 0;
2445 /* Remove the attributes from declspecs, since they will confuse the
2447 split_specs_attrs (declspecs, &specs, &attrs);
2449 for (link = specs; link; link = TREE_CHAIN (link))
2451 tree value = TREE_VALUE (link);
2452 enum tree_code code = TREE_CODE (value);
2454 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2455 /* Used to test also that TYPE_SIZE (value) != 0.
2456 That caused warning for `struct foo;' at top level in the file. */
2458 tree name = TYPE_NAME (value);
2465 if (warned != 1 && code != ENUMERAL_TYPE)
2466 /* Empty unnamed enum OK */
2468 pedwarn ("unnamed struct/union that defines no instances");
2474 t = lookup_tag (code, name, 1);
2478 t = make_node (code);
2485 if (!warned && ! in_system_header)
2487 warning ("useless keyword or type name in empty declaration");
2494 error ("two types specified in one empty declaration");
2499 pedwarn ("empty declaration");
2503 /* Construct an array declarator. EXPR is the expression inside [], or
2504 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2505 to the pointer to which a parameter array is converted). STATIC_P is
2506 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2507 is nonzero is the array is [*], a VLA of unspecified length which is
2508 nevertheless a complete type (not currently implemented by GCC),
2509 zero otherwise. The declarator is constructed as an ARRAY_REF
2510 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2511 left of the [] (filled by in set_array_declarator_type) and operand 1
2512 is the expression inside; whose TREE_TYPE is the type qualifiers and
2513 which has TREE_STATIC set if "static" is used. */
2516 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2519 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2520 TREE_TYPE (decl) = quals;
2521 TREE_STATIC (decl) = (static_p ? 1 : 0);
2522 if (pedantic && !flag_isoc99)
2524 if (static_p || quals != NULL_TREE)
2525 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2527 pedwarn ("ISO C90 does not support `[*]' array declarators");
2530 warning ("GCC does not yet properly implement `[*]' array declarators");
2534 /* Set the type of an array declarator. DECL is the declarator, as
2535 constructed by build_array_declarator; TYPE is what appears on the left
2536 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2537 abstract declarator, zero otherwise; this is used to reject static and
2538 type qualifiers in abstract declarators, where they are not in the
2542 set_array_declarator_type (tree decl, tree type, int abstract_p)
2544 TREE_OPERAND (decl, 0) = type;
2545 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2546 error ("static or type qualifiers in abstract declarator");
2550 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2553 groktypename (tree typename)
2557 if (TREE_CODE (typename) != TREE_LIST)
2560 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2562 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
2564 /* Apply attributes. */
2565 decl_attributes (&typename, attrs, 0);
2570 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2573 groktypename_in_parm_context (tree typename)
2575 if (TREE_CODE (typename) != TREE_LIST)
2577 return grokdeclarator (TREE_VALUE (typename),
2578 TREE_PURPOSE (typename),
2582 /* Decode a declarator in an ordinary declaration or data definition.
2583 This is called as soon as the type information and variable name
2584 have been parsed, before parsing the initializer if any.
2585 Here we create the ..._DECL node, fill in its type,
2586 and put it on the list of decls for the current context.
2587 The ..._DECL node is returned as the value.
2589 Exception: for arrays where the length is not specified,
2590 the type is left null, to be filled in by `finish_decl'.
2592 Function definitions do not come here; they go to start_function
2593 instead. However, external and forward declarations of functions
2594 do go through here. Structure field declarations are done by
2595 grokfield and not through here. */
2598 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2603 /* An object declared as __attribute__((deprecated)) suppresses
2604 warnings of uses of other deprecated items. */
2605 if (lookup_attribute ("deprecated", attributes))
2606 deprecated_state = DEPRECATED_SUPPRESS;
2608 decl = grokdeclarator (declarator, declspecs,
2609 NORMAL, initialized);
2611 deprecated_state = DEPRECATED_NORMAL;
2613 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2614 && MAIN_NAME_P (DECL_NAME (decl)))
2615 warning ("%H'%D' is usually a function",
2616 &DECL_SOURCE_LOCATION (decl), decl);
2619 /* Is it valid for this decl to have an initializer at all?
2620 If not, set INITIALIZED to zero, which will indirectly
2621 tell `finish_decl' to ignore the initializer once it is parsed. */
2622 switch (TREE_CODE (decl))
2625 error ("typedef `%s' is initialized (use __typeof__ instead)",
2626 IDENTIFIER_POINTER (DECL_NAME (decl)));
2631 error ("function `%s' is initialized like a variable",
2632 IDENTIFIER_POINTER (DECL_NAME (decl)));
2637 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2638 error ("parameter `%s' is initialized",
2639 IDENTIFIER_POINTER (DECL_NAME (decl)));
2644 /* Don't allow initializations for incomplete types
2645 except for arrays which might be completed by the initialization. */
2647 /* This can happen if the array size is an undefined macro. We already
2648 gave a warning, so we don't need another one. */
2649 if (TREE_TYPE (decl) == error_mark_node)
2651 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2653 /* A complete type is ok if size is fixed. */
2655 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2656 || C_DECL_VARIABLE_SIZE (decl))
2658 error ("variable-sized object may not be initialized");
2662 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2664 error ("variable `%s' has initializer but incomplete type",
2665 IDENTIFIER_POINTER (DECL_NAME (decl)));
2668 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2670 error ("elements of array `%s' have incomplete type",
2671 IDENTIFIER_POINTER (DECL_NAME (decl)));
2678 DECL_EXTERNAL (decl) = 0;
2679 if (current_scope == global_scope)
2680 TREE_STATIC (decl) = 1;
2682 /* Tell `pushdecl' this is an initialized decl
2683 even though we don't yet have the initializer expression.
2684 Also tell `finish_decl' it may store the real initializer. */
2685 DECL_INITIAL (decl) = error_mark_node;
2688 /* If this is a function declaration, write a record describing it to the
2689 prototypes file (if requested). */
2691 if (TREE_CODE (decl) == FUNCTION_DECL)
2692 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2694 /* ANSI specifies that a tentative definition which is not merged with
2695 a non-tentative definition behaves exactly like a definition with an
2696 initializer equal to zero. (Section 3.7.2)
2698 -fno-common gives strict ANSI behavior, though this tends to break
2699 a large body of code that grew up without this rule.
2701 Thread-local variables are never common, since there's no entrenched
2702 body of code to break, and it allows more efficient variable references
2703 in the presence of dynamic linking. */
2705 if (TREE_CODE (decl) == VAR_DECL
2707 && TREE_PUBLIC (decl)
2708 && !DECL_THREAD_LOCAL (decl)
2710 DECL_COMMON (decl) = 1;
2712 /* Set attributes here so if duplicate decl, will have proper attributes. */
2713 decl_attributes (&decl, attributes, 0);
2715 if (TREE_CODE (decl) == FUNCTION_DECL
2716 && DECL_DECLARED_INLINE_P (decl)
2717 && DECL_UNINLINABLE (decl)
2718 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2719 warning ("%Hinline function '%D' given attribute noinline",
2720 &DECL_SOURCE_LOCATION (decl), decl);
2722 /* Add this decl to the current scope.
2723 TEM may equal DECL or it may be a previous decl of the same name. */
2724 tem = pushdecl (decl);
2726 /* For a local variable, define the RTL now. */
2727 if (current_scope != global_scope
2728 /* But not if this is a duplicate decl
2729 and we preserved the rtl from the previous one
2730 (which may or may not happen). */
2731 && !DECL_RTL_SET_P (tem)
2732 && C_DECL_FILE_SCOPE (tem))
2734 if (TREE_TYPE (tem) != error_mark_node
2735 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
2737 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2738 && DECL_INITIAL (tem) != 0)
2745 /* Finish processing of a declaration;
2746 install its initial value.
2747 If the length of an array type is not known before,
2748 it must be determined now, from the initial value, or it is an error. */
2751 finish_decl (tree decl, tree init, tree asmspec_tree)
2753 tree type = TREE_TYPE (decl);
2754 int was_incomplete = (DECL_SIZE (decl) == 0);
2755 const char *asmspec = 0;
2757 /* If a name was specified, get the string. */
2758 if (current_scope == global_scope)
2759 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2761 asmspec = TREE_STRING_POINTER (asmspec_tree);
2763 /* If `start_decl' didn't like having an initialization, ignore it now. */
2764 if (init != 0 && DECL_INITIAL (decl) == 0)
2767 /* Don't crash if parm is initialized. */
2768 if (TREE_CODE (decl) == PARM_DECL)
2772 store_init_value (decl, init);
2774 /* Deduce size of array from initialization, if not already known */
2775 if (TREE_CODE (type) == ARRAY_TYPE
2776 && TYPE_DOMAIN (type) == 0
2777 && TREE_CODE (decl) != TYPE_DECL)
2780 = (TREE_STATIC (decl)
2781 /* Even if pedantic, an external linkage array
2782 may have incomplete type at first. */
2783 ? pedantic && !TREE_PUBLIC (decl)
2784 : !DECL_EXTERNAL (decl));
2786 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2788 /* Get the completed type made by complete_array_type. */
2789 type = TREE_TYPE (decl);
2792 error ("%Hinitializer fails to determine size of '%D'",
2793 &DECL_SOURCE_LOCATION (decl), decl);
2795 else if (failure == 2)
2798 error ("%Harray size missing in '%D'",
2799 &DECL_SOURCE_LOCATION (decl), decl);
2800 /* If a `static' var's size isn't known,
2801 make it extern as well as static, so it does not get
2803 If it is not `static', then do not mark extern;
2804 finish_incomplete_decl will give it a default size
2805 and it will get allocated. */
2806 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2807 DECL_EXTERNAL (decl) = 1;
2810 /* TYPE_MAX_VALUE is always one less than the number of elements
2811 in the array, because we start counting at zero. Therefore,
2812 warn only if the value is less than zero. */
2813 else if (pedantic && TYPE_DOMAIN (type) != 0
2814 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2815 error ("%Hzero or negative size array '%D'",
2816 &DECL_SOURCE_LOCATION (decl), decl);
2818 layout_decl (decl, 0);
2821 if (TREE_CODE (decl) == VAR_DECL)
2823 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2824 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2825 layout_decl (decl, 0);
2827 if (DECL_SIZE (decl) == 0
2828 /* Don't give an error if we already gave one earlier. */
2829 && TREE_TYPE (decl) != error_mark_node
2830 && (TREE_STATIC (decl)
2832 /* A static variable with an incomplete type
2833 is an error if it is initialized.
2834 Also if it is not file scope.
2835 Otherwise, let it through, but if it is not `extern'
2836 then it may cause an error message later. */
2837 (DECL_INITIAL (decl) != 0
2838 || !C_DECL_FILE_SCOPE (decl))
2840 /* An automatic variable with an incomplete type
2842 !DECL_EXTERNAL (decl)))
2844 error ("%Hstorage size of '%D' isn't known",
2845 &DECL_SOURCE_LOCATION (decl), decl);
2846 TREE_TYPE (decl) = error_mark_node;
2849 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2850 && DECL_SIZE (decl) != 0)
2852 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2853 constant_expression_warning (DECL_SIZE (decl));
2855 error ("%Hstorage size of '%D' isn't constant",
2856 &DECL_SOURCE_LOCATION (decl), decl);
2859 if (TREE_USED (type))
2860 TREE_USED (decl) = 1;
2863 /* If this is a function and an assembler name is specified, reset DECL_RTL
2864 so we can give it its new name. Also, update built_in_decls if it
2865 was a normal built-in. */
2866 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2868 /* ASMSPEC is given, and not the name of a register. Mark the
2869 name with a star so assemble_name won't munge it. */
2870 char *starred = alloca (strlen (asmspec) + 2);
2872 strcpy (starred + 1, asmspec);
2874 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2876 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2877 SET_DECL_RTL (builtin, NULL_RTX);
2878 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2879 #ifdef TARGET_MEM_FUNCTIONS
2880 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2881 init_block_move_fn (starred);
2882 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2883 init_block_clear_fn (starred);
2885 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2886 init_block_move_fn (starred);
2887 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2888 init_block_clear_fn (starred);
2891 SET_DECL_RTL (decl, NULL_RTX);
2892 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (starred));
2895 /* If #pragma weak was used, mark the decl weak now. */
2896 if (current_scope == global_scope)
2897 maybe_apply_pragma_weak (decl);
2899 /* Output the assembler code and/or RTL code for variables and functions,
2900 unless the type is an undefined structure or union.
2901 If not, it will get done when the type is completed. */
2903 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2905 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2906 if (c_dialect_objc ())
2907 objc_check_decl (decl);
2909 if (C_DECL_FILE_SCOPE (decl))
2911 if (DECL_INITIAL (decl) == NULL_TREE
2912 || DECL_INITIAL (decl) == error_mark_node)
2913 /* Don't output anything
2914 when a tentative file-scope definition is seen.
2915 But at end of compilation, do output code for them. */
2916 DECL_DEFER_OUTPUT (decl) = 1;
2917 rest_of_decl_compilation (decl, asmspec, true, 0);
2921 /* This is a local variable. If there is an ASMSPEC, the
2922 user has requested that we handle it specially. */
2925 /* In conjunction with an ASMSPEC, the `register'
2926 keyword indicates that we should place the variable
2927 in a particular register. */
2928 if (DECL_REGISTER (decl))
2929 DECL_C_HARD_REGISTER (decl) = 1;
2931 /* If this is not a static variable, issue a warning.
2932 It doesn't make any sense to give an ASMSPEC for an
2933 ordinary, non-register local variable. Historically,
2934 GCC has accepted -- but ignored -- the ASMSPEC in
2936 if (TREE_CODE (decl) == VAR_DECL
2937 && !DECL_REGISTER (decl)
2938 && !TREE_STATIC (decl))
2939 warning ("%Hignoring asm-specifier for non-static local "
2940 "variable '%D'", &DECL_SOURCE_LOCATION (decl), decl);
2942 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
2945 if (TREE_CODE (decl) != FUNCTION_DECL)
2946 add_decl_stmt (decl);
2949 if (!C_DECL_FILE_SCOPE (decl))
2951 /* Recompute the RTL of a local array now
2952 if it used to be an incomplete type. */
2954 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2956 /* If we used it already as memory, it must stay in memory. */
2957 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2958 /* If it's still incomplete now, no init will save it. */
2959 if (DECL_SIZE (decl) == 0)
2960 DECL_INITIAL (decl) = 0;
2965 /* If this was marked 'used', be sure it will be output. */
2966 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2967 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2969 if (TREE_CODE (decl) == TYPE_DECL)
2971 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2972 if (c_dialect_objc ())
2973 objc_check_decl (decl);
2974 rest_of_decl_compilation (decl, NULL, C_DECL_FILE_SCOPE (decl), 0);
2977 /* At the end of a declaration, throw away any variable type sizes
2978 of types defined inside that declaration. There is no use
2979 computing them in the following function definition. */
2980 if (current_scope == global_scope)
2981 get_pending_sizes ();
2983 /* Install a cleanup (aka destructor) if one was given. */
2984 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2986 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2989 static bool eh_initialized_p;
2991 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2992 tree cleanup_decl = lookup_name (cleanup_id);
2995 /* Build "cleanup(&decl)" for the destructor. */
2996 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2997 cleanup = build_tree_list (NULL_TREE, cleanup);
2998 cleanup = build_function_call (cleanup_decl, cleanup);
3000 /* Don't warn about decl unused; the cleanup uses it. */
3001 TREE_USED (decl) = 1;
3003 /* Initialize EH, if we've been told to do so. */
3004 if (flag_exceptions && !eh_initialized_p)
3006 eh_initialized_p = true;
3007 eh_personality_libfunc
3008 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3009 ? "__gcc_personality_sj0"
3010 : "__gcc_personality_v0");
3011 using_eh_for_cleanups ();
3014 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
3019 /* Given a parsed parameter declaration,
3020 decode it into a PARM_DECL and push that on the current scope.
3021 Also, for the sake of forward parm decls,
3022 record the given order of parms in `parm_order'. */
3025 push_parm_decl (tree parm)
3028 int old_immediate_size_expand = immediate_size_expand;
3029 /* Don't try computing parm sizes now -- wait till fn is called. */
3030 immediate_size_expand = 0;
3032 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3033 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3034 decl_attributes (&decl, TREE_VALUE (parm), 0);
3036 decl = pushdecl (decl);
3038 immediate_size_expand = old_immediate_size_expand;
3040 current_scope->parm_order
3041 = tree_cons (NULL_TREE, decl, current_scope->parm_order);
3043 /* Add this decl to the current scope. */
3044 finish_decl (decl, NULL_TREE, NULL_TREE);
3047 /* Clear the given order of parms in `parm_order'.
3048 Used at start of parm list,
3049 and also at semicolon terminating forward decls. */
3052 clear_parm_order (void)
3054 current_scope->parm_order = NULL_TREE;
3057 static GTY(()) int compound_literal_number;
3059 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3060 literal, which may be an incomplete array type completed by the
3061 initializer; INIT is a CONSTRUCTOR that initializes the compound
3065 build_compound_literal (tree type, tree init)
3067 /* We do not use start_decl here because we have a type, not a declarator;
3068 and do not use finish_decl because the decl should be stored inside
3069 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3070 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3073 DECL_EXTERNAL (decl) = 0;
3074 TREE_PUBLIC (decl) = 0;
3075 TREE_STATIC (decl) = (current_scope == global_scope);
3076 DECL_CONTEXT (decl) = current_function_decl;
3077 TREE_USED (decl) = 1;
3078 TREE_TYPE (decl) = type;
3079 TREE_READONLY (decl) = TREE_READONLY (type);
3080 store_init_value (decl, init);
3082 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3084 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3089 type = TREE_TYPE (decl);
3090 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3091 return error_mark_node;
3093 stmt = build_stmt (DECL_STMT, decl);
3094 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3095 TREE_SIDE_EFFECTS (complit) = 1;
3097 layout_decl (decl, 0);
3099 if (TREE_STATIC (decl))
3101 /* This decl needs a name for the assembler output. We also need
3102 a unique suffix to be added to the name. */
3105 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3106 compound_literal_number);
3107 compound_literal_number++;
3108 DECL_NAME (decl) = get_identifier (name);
3109 DECL_DEFER_OUTPUT (decl) = 1;
3110 DECL_COMDAT (decl) = 1;
3111 DECL_ARTIFICIAL (decl) = 1;
3113 rest_of_decl_compilation (decl, NULL, 1, 0);
3119 /* Make TYPE a complete type based on INITIAL_VALUE.
3120 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3121 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3124 complete_array_type (tree type, tree initial_value, int do_default)
3126 tree maxindex = NULL_TREE;
3131 /* Note MAXINDEX is really the maximum index,
3132 one less than the size. */
3133 if (TREE_CODE (initial_value) == STRING_CST)
3136 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3137 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3140 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3142 tree elts = CONSTRUCTOR_ELTS (initial_value);
3143 maxindex = build_int_2 (-1, -1);
3144 for (; elts; elts = TREE_CHAIN (elts))
3146 if (TREE_PURPOSE (elts))
3147 maxindex = TREE_PURPOSE (elts);
3149 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3150 maxindex, integer_one_node));
3152 maxindex = copy_node (maxindex);
3156 /* Make an error message unless that happened already. */
3157 if (initial_value != error_mark_node)
3160 /* Prevent further error messages. */
3161 maxindex = build_int_2 (0, 0);
3168 maxindex = build_int_2 (0, 0);
3174 TYPE_DOMAIN (type) = build_index_type (maxindex);
3175 if (!TREE_TYPE (maxindex))
3176 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3179 /* Lay out the type now that we can get the real answer. */
3186 /* Determine whether TYPE is a structure with a flexible array member,
3187 or a union containing such a structure (possibly recursively). */
3190 flexible_array_type_p (tree type)
3193 switch (TREE_CODE (type))
3196 x = TYPE_FIELDS (type);
3199 while (TREE_CHAIN (x) != NULL_TREE)
3201 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3202 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3203 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3204 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3208 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3210 if (flexible_array_type_p (TREE_TYPE (x)))
3219 /* Given declspecs and a declarator,
3220 determine the name and type of the object declared
3221 and construct a ..._DECL node for it.
3222 (In one case we can return a ..._TYPE node instead.
3223 For invalid input we sometimes return 0.)
3225 DECLSPECS is a chain of tree_list nodes whose value fields
3226 are the storage classes and type specifiers.
3228 DECL_CONTEXT says which syntactic context this declaration is in:
3229 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3230 FUNCDEF for a function definition. Like NORMAL but a few different
3231 error messages in each case. Return value may be zero meaning
3232 this definition is too screwy to try to parse.
3233 PARM for a parameter declaration (either within a function prototype
3234 or before a function body). Make a PARM_DECL, or return void_type_node.
3235 TYPENAME if for a typename (in a cast or sizeof).
3236 Don't make a DECL node; just return the ..._TYPE node.
3237 FIELD for a struct or union field; make a FIELD_DECL.
3238 BITFIELD for a field with specified width.
3239 INITIALIZED is 1 if the decl has an initializer.
3241 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3242 It may also be so in the PARM case, for a prototype where the
3243 argument type is specified but not the name.
3245 This function is where the complicated C meanings of `static'
3246 and `extern' are interpreted. */
3249 grokdeclarator (tree declarator, tree declspecs,
3250 enum decl_context decl_context, int initialized)
3254 tree type = NULL_TREE;
3259 int type_quals = TYPE_UNQUALIFIED;
3261 int explicit_int = 0;
3262 int explicit_char = 0;
3263 int defaulted_int = 0;
3264 tree typedef_decl = 0;
3266 tree typedef_type = 0;
3267 int funcdef_flag = 0;
3268 enum tree_code innermost_code = ERROR_MARK;
3270 int size_varies = 0;
3271 tree decl_attr = NULL_TREE;
3272 tree array_ptr_quals = NULL_TREE;
3273 int array_parm_static = 0;
3274 tree returned_attrs = NULL_TREE;
3276 if (decl_context == BITFIELD)
3277 bitfield = 1, decl_context = FIELD;
3279 if (decl_context == FUNCDEF)
3280 funcdef_flag = 1, decl_context = NORMAL;
3282 /* Look inside a declarator for the name being declared
3283 and get it as a string, for an error message. */
3285 tree decl = declarator;
3289 switch (TREE_CODE (decl))
3294 innermost_code = TREE_CODE (decl);
3295 decl = TREE_OPERAND (decl, 0);
3299 decl = TREE_VALUE (decl);
3302 case IDENTIFIER_NODE:
3303 name = IDENTIFIER_POINTER (decl);
3314 /* A function definition's declarator must have the form of
3315 a function declarator. */
3317 if (funcdef_flag && innermost_code != CALL_EXPR)
3320 /* If this looks like a function definition, make it one,
3321 even if it occurs where parms are expected.
3322 Then store_parm_decls will reject it and not use it as a parm. */
3323 if (decl_context == NORMAL && !funcdef_flag
3324 && current_scope->parm_flag)
3325 decl_context = PARM;
3327 /* Look through the decl specs and record which ones appear.
3328 Some typespecs are defined as built-in typenames.
3329 Others, the ones that are modifiers of other types,
3330 are represented by bits in SPECBITS: set the bits for
3331 the modifiers that appear. Storage class keywords are also in SPECBITS.
3333 If there is a typedef name or a type, store the type in TYPE.
3334 This includes builtin typedefs such as `int'.
3336 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3337 and did not come from a user typedef.
3339 Set LONGLONG if `long' is mentioned twice. */
3341 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3343 tree id = TREE_VALUE (spec);
3345 /* If the entire declaration is itself tagged as deprecated then
3346 suppress reports of deprecated items. */
3347 if (id && TREE_DEPRECATED (id))
3349 if (deprecated_state != DEPRECATED_SUPPRESS)
3350 warn_deprecated_use (id);
3353 if (id == ridpointers[(int) RID_INT])
3355 if (id == ridpointers[(int) RID_CHAR])
3358 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3360 enum rid i = C_RID_CODE (id);
3361 if ((int) i <= (int) RID_LAST_MODIFIER)
3363 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3366 error ("`long long long' is too long for GCC");
3369 if (pedantic && !flag_isoc99 && ! in_system_header
3371 pedwarn ("ISO C90 does not support `long long'");
3375 else if (specbits & (1 << (int) i))
3377 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3380 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3383 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3386 /* Diagnose "__thread extern". Recall that this list
3387 is in the reverse order seen in the text. */
3389 && (specbits & (1 << (int) RID_EXTERN
3390 | 1 << (int) RID_STATIC)))
3392 if (specbits & 1 << (int) RID_EXTERN)
3393 error ("`__thread' before `extern'");
3395 error ("`__thread' before `static'");
3398 specbits |= 1 << (int) i;
3403 error ("two or more data types in declaration of `%s'", name);
3404 /* Actual typedefs come to us as TYPE_DECL nodes. */
3405 else if (TREE_CODE (id) == TYPE_DECL)
3407 if (TREE_TYPE (id) == error_mark_node)
3408 ; /* Allow the type to default to int to avoid cascading errors. */
3411 type = TREE_TYPE (id);
3412 decl_attr = DECL_ATTRIBUTES (id);
3416 /* Built-in types come as identifiers. */
3417 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3419 tree t = lookup_name (id);
3420 if (TREE_TYPE (t) == error_mark_node)
3422 else if (!t || TREE_CODE (t) != TYPE_DECL)
3423 error ("`%s' fails to be a typedef or built in type",
3424 IDENTIFIER_POINTER (id));
3427 type = TREE_TYPE (t);
3431 else if (TREE_CODE (id) != ERROR_MARK)
3438 typedef_type = type;
3440 size_varies = C_TYPE_VARIABLE_SIZE (type);
3442 /* No type at all: default to `int', and set DEFAULTED_INT
3443 because it was not a user-defined typedef. */
3447 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3448 | (1 << (int) RID_SIGNED)
3449 | (1 << (int) RID_UNSIGNED)
3450 | (1 << (int) RID_COMPLEX))))
3451 /* Don't warn about typedef foo = bar. */
3452 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3453 && ! in_system_header)
3455 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3456 and this is a function, or if -Wimplicit; prefer the former
3457 warning since it is more explicit. */
3458 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3460 warn_about_return_type = 1;
3461 else if (warn_implicit_int || flag_isoc99)
3462 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3467 type = integer_type_node;
3470 /* Now process the modifiers that were specified
3471 and check for invalid combinations. */
3473 /* Long double is a special combination. */
3475 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3476 && TYPE_MAIN_VARIANT (type) == double_type_node)
3478 specbits &= ~(1 << (int) RID_LONG);
3479 type = long_double_type_node;
3482 /* Check all other uses of type modifiers. */
3484 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3485 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3489 if ((specbits & 1 << (int) RID_LONG)
3490 && (specbits & 1 << (int) RID_SHORT))
3491 error ("both long and short specified for `%s'", name);
3492 else if (((specbits & 1 << (int) RID_LONG)
3493 || (specbits & 1 << (int) RID_SHORT))
3495 error ("long or short specified with char for `%s'", name);
3496 else if (((specbits & 1 << (int) RID_LONG)
3497 || (specbits & 1 << (int) RID_SHORT))
3498 && TREE_CODE (type) == REAL_TYPE)
3500 static int already = 0;
3502 error ("long or short specified with floating type for `%s'", name);
3503 if (! already && ! pedantic)
3505 error ("the only valid combination is `long double'");
3509 else if ((specbits & 1 << (int) RID_SIGNED)
3510 && (specbits & 1 << (int) RID_UNSIGNED))
3511 error ("both signed and unsigned specified for `%s'", name);
3512 else if (TREE_CODE (type) != INTEGER_TYPE)
3513 error ("long, short, signed or unsigned invalid for `%s'", name);
3517 if (!explicit_int && !defaulted_int && !explicit_char)
3519 error ("long, short, signed or unsigned used invalidly for `%s'",
3525 /* Discard the type modifiers if they are invalid. */
3528 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3529 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3534 if ((specbits & (1 << (int) RID_COMPLEX))
3535 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3537 error ("complex invalid for `%s'", name);
3538 specbits &= ~(1 << (int) RID_COMPLEX);
3541 /* Decide whether an integer type is signed or not.
3542 Optionally treat bitfields as signed by default. */
3543 if (specbits & 1 << (int) RID_UNSIGNED
3544 || (bitfield && ! flag_signed_bitfields
3545 && (explicit_int || defaulted_int || explicit_char
3546 /* A typedef for plain `int' without `signed'
3547 can be controlled just like plain `int'. */
3548 || ! (typedef_decl != 0
3549 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3550 && TREE_CODE (type) != ENUMERAL_TYPE
3551 && !(specbits & 1 << (int) RID_SIGNED)))
3554 type = long_long_unsigned_type_node;
3555 else if (specbits & 1 << (int) RID_LONG)
3556 type = long_unsigned_type_node;
3557 else if (specbits & 1 << (int) RID_SHORT)
3558 type = short_unsigned_type_node;
3559 else if (type == char_type_node)
3560 type = unsigned_char_type_node;
3561 else if (typedef_decl)
3562 type = c_common_unsigned_type (type);
3564 type = unsigned_type_node;
3566 else if ((specbits & 1 << (int) RID_SIGNED)
3567 && type == char_type_node)
3568 type = signed_char_type_node;
3570 type = long_long_integer_type_node;
3571 else if (specbits & 1 << (int) RID_LONG)
3572 type = long_integer_type_node;
3573 else if (specbits & 1 << (int) RID_SHORT)
3574 type = short_integer_type_node;
3576 if (specbits & 1 << (int) RID_COMPLEX)
3578 if (pedantic && !flag_isoc99)
3579 pedwarn ("ISO C90 does not support complex types");
3580 /* If we just have "complex", it is equivalent to
3581 "complex double", but if any modifiers at all are specified it is
3582 the complex form of TYPE. E.g, "complex short" is
3583 "complex short int". */
3585 if (defaulted_int && ! longlong
3586 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3587 | (1 << (int) RID_SIGNED)
3588 | (1 << (int) RID_UNSIGNED))))
3591 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3592 type = complex_double_type_node;
3594 else if (type == integer_type_node)
3597 pedwarn ("ISO C does not support complex integer types");
3598 type = complex_integer_type_node;
3600 else if (type == float_type_node)
3601 type = complex_float_type_node;
3602 else if (type == double_type_node)
3603 type = complex_double_type_node;
3604 else if (type == long_double_type_node)
3605 type = complex_long_double_type_node;
3609 pedwarn ("ISO C does not support complex integer types");
3610 type = build_complex_type (type);
3614 /* Figure out the type qualifiers for the declaration. There are
3615 two ways a declaration can become qualified. One is something
3616 like `const int i' where the `const' is explicit. Another is
3617 something like `typedef const int CI; CI i' where the type of the
3618 declaration contains the `const'. */
3619 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3620 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
3621 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3622 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3623 if (constp > 1 && ! flag_isoc99)
3624 pedwarn ("duplicate `const'");
3625 if (restrictp > 1 && ! flag_isoc99)
3626 pedwarn ("duplicate `restrict'");
3627 if (volatilep > 1 && ! flag_isoc99)
3628 pedwarn ("duplicate `volatile'");
3629 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3630 type = TYPE_MAIN_VARIANT (type);
3631 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3632 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3633 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3635 /* Warn if two storage classes are given. Default to `auto'. */
3640 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3641 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3642 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3643 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3644 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3646 /* "static __thread" and "extern __thread" are allowed. */
3647 if ((specbits & (1 << (int) RID_THREAD
3648 | 1 << (int) RID_STATIC
3649 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3652 /* Warn about storage classes that are invalid for certain
3653 kinds of declarations (parameters, typenames, etc.). */
3656 error ("multiple storage classes in declaration of `%s'", name);
3657 else if (funcdef_flag
3659 & ((1 << (int) RID_REGISTER)
3660 | (1 << (int) RID_AUTO)
3661 | (1 << (int) RID_TYPEDEF)
3662 | (1 << (int) RID_THREAD))))
3664 if (specbits & 1 << (int) RID_AUTO
3665 && (pedantic || current_scope == global_scope))
3666 pedwarn ("function definition declared `auto'");
3667 if (specbits & 1 << (int) RID_REGISTER)
3668 error ("function definition declared `register'");
3669 if (specbits & 1 << (int) RID_TYPEDEF)
3670 error ("function definition declared `typedef'");
3671 if (specbits & 1 << (int) RID_THREAD)
3672 error ("function definition declared `__thread'");
3673 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3674 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3676 else if (decl_context != NORMAL && nclasses > 0)
3678 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3682 switch (decl_context)
3685 error ("storage class specified for structure field `%s'",
3689 error ("storage class specified for parameter `%s'", name);
3692 error ("storage class specified for typename");
3695 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3696 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3697 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3700 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3702 /* `extern' with initialization is invalid if not at file scope. */
3703 if (current_scope == global_scope)
3704 warning ("`%s' initialized and declared `extern'", name);
3706 error ("`%s' has both `extern' and initializer", name);
3708 else if (current_scope == global_scope)
3710 if (specbits & 1 << (int) RID_AUTO)
3711 error ("file-scope declaration of `%s' specifies `auto'", name);
3715 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3716 error ("nested function `%s' declared `extern'", name);
3717 else if ((specbits & (1 << (int) RID_THREAD
3718 | 1 << (int) RID_EXTERN
3719 | 1 << (int) RID_STATIC))
3720 == (1 << (int) RID_THREAD))
3722 error ("function-scope `%s' implicitly auto and declared `__thread'",
3724 specbits &= ~(1 << (int) RID_THREAD);
3729 /* Now figure out the structure of the declarator proper.
3730 Descend through it, creating more complex types, until we reach
3731 the declared identifier (or NULL_TREE, in an absolute declarator). */
3733 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3735 if (type == error_mark_node)
3737 declarator = TREE_OPERAND (declarator, 0);
3741 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3742 an INDIRECT_REF (for *...),
3743 a CALL_EXPR (for ...(...)),
3744 a TREE_LIST (for nested attributes),
3745 an identifier (for the name being declared)
3746 or a null pointer (for the place in an absolute declarator
3747 where the name was omitted).
3748 For the last two cases, we have just exited the loop.
3750 At this point, TYPE is the type of elements of an array,
3751 or for a function to return, or for a pointer to point to.
3752 After this sequence of ifs, TYPE is the type of the
3753 array or function or pointer, and DECLARATOR has had its
3754 outermost layer removed. */
3756 if (array_ptr_quals != NULL_TREE || array_parm_static)
3758 /* Only the innermost declarator (making a parameter be of
3759 array type which is converted to pointer type)
3760 may have static or type qualifiers. */
3761 error ("static or type qualifiers in non-parameter array declarator");
3762 array_ptr_quals = NULL_TREE;
3763 array_parm_static = 0;
3766 if (TREE_CODE (declarator) == TREE_LIST)
3768 /* We encode a declarator with embedded attributes using
3770 tree attrs = TREE_PURPOSE (declarator);
3773 declarator = TREE_VALUE (declarator);
3774 inner_decl = declarator;
3775 while (inner_decl != NULL_TREE
3776 && TREE_CODE (inner_decl) == TREE_LIST)
3777 inner_decl = TREE_VALUE (inner_decl);
3778 if (inner_decl == NULL_TREE
3779 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3780 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3781 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3782 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3783 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3784 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3785 returned_attrs = decl_attributes (&type,
3786 chainon (returned_attrs, attrs),
3789 else if (TREE_CODE (declarator) == ARRAY_REF)
3791 tree itype = NULL_TREE;
3792 tree size = TREE_OPERAND (declarator, 1);
3793 /* The index is a signed object `sizetype' bits wide. */
3794 tree index_type = c_common_signed_type (sizetype);
3796 array_ptr_quals = TREE_TYPE (declarator);
3797 array_parm_static = TREE_STATIC (declarator);
3799 declarator = TREE_OPERAND (declarator, 0);
3801 /* Check for some types that there cannot be arrays of. */
3803 if (VOID_TYPE_P (type))
3805 error ("declaration of `%s' as array of voids", name);
3806 type = error_mark_node;
3809 if (TREE_CODE (type) == FUNCTION_TYPE)
3811 error ("declaration of `%s' as array of functions", name);
3812 type = error_mark_node;
3815 if (pedantic && flexible_array_type_p (type))
3816 pedwarn ("invalid use of structure with flexible array member");
3818 if (size == error_mark_node)
3819 type = error_mark_node;
3821 if (type == error_mark_node)
3824 /* If size was specified, set ITYPE to a range-type for that size.
3825 Otherwise, ITYPE remains null. finish_decl may figure it out
3826 from an initial value. */
3830 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3831 STRIP_TYPE_NOPS (size);
3833 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3835 error ("size of array `%s' has non-integer type", name);
3836 size = integer_one_node;
3839 if (pedantic && integer_zerop (size))
3840 pedwarn ("ISO C forbids zero-size array `%s'", name);
3842 if (TREE_CODE (size) == INTEGER_CST)
3844 constant_expression_warning (size);
3845 if (tree_int_cst_sgn (size) < 0)
3847 error ("size of array `%s' is negative", name);
3848 size = integer_one_node;
3853 /* Make sure the array size remains visibly nonconstant
3854 even if it is (eg) a const variable with known value. */
3857 if (!flag_isoc99 && pedantic)
3859 if (TREE_CONSTANT (size))
3860 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3863 pedwarn ("ISO C90 forbids variable-size array `%s'",
3868 if (integer_zerop (size))
3870 /* A zero-length array cannot be represented with an
3871 unsigned index type, which is what we'll get with
3872 build_index_type. Create an open-ended range instead. */
3873 itype = build_range_type (sizetype, size, NULL_TREE);
3877 /* Compute the maximum valid index, that is, size - 1.
3878 Do the calculation in index_type, so that if it is
3879 a variable the computations will be done in the
3881 itype = fold (build (MINUS_EXPR, index_type,
3882 convert (index_type, size),
3883 convert (index_type, size_one_node)));
3885 /* If that overflowed, the array is too big.
3886 ??? While a size of INT_MAX+1 technically shouldn't
3887 cause an overflow (because we subtract 1), the overflow
3888 is recorded during the conversion to index_type, before
3889 the subtraction. Handling this case seems like an
3890 unnecessary complication. */
3891 if (TREE_OVERFLOW (itype))
3893 error ("size of array `%s' is too large", name);
3894 type = error_mark_node;
3900 /* We must be able to distinguish the
3901 SAVE_EXPR_CONTEXT for the variably-sized type
3902 so that we can set it correctly in
3903 set_save_expr_context. The convention is
3904 that all SAVE_EXPRs that need to be reset
3905 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3906 tree cfd = current_function_decl;
3907 if (decl_context == PARM)
3908 current_function_decl = NULL_TREE;
3909 itype = variable_size (itype);
3910 if (decl_context == PARM)
3911 current_function_decl = cfd;
3913 itype = build_index_type (itype);
3916 else if (decl_context == FIELD)
3918 if (pedantic && !flag_isoc99 && !in_system_header)
3919 pedwarn ("ISO C90 does not support flexible array members");
3921 /* ISO C99 Flexible array members are effectively identical
3922 to GCC's zero-length array extension. */
3923 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3926 /* If pedantic, complain about arrays of incomplete types. */
3928 if (pedantic && !COMPLETE_TYPE_P (type))
3929 pedwarn ("array type has incomplete element type");
3931 /* Build the array type itself, then merge any constancy or
3932 volatility into the target type. We must do it in this order
3933 to ensure that the TYPE_MAIN_VARIANT field of the array type
3934 is set correctly. */
3936 type = build_array_type (type, itype);
3938 type = c_build_qualified_type (type, type_quals);
3941 C_TYPE_VARIABLE_SIZE (type) = 1;
3943 /* The GCC extension for zero-length arrays differs from
3944 ISO flexible array members in that sizeof yields zero. */
3945 if (size && integer_zerop (size))
3948 TYPE_SIZE (type) = bitsize_zero_node;
3949 TYPE_SIZE_UNIT (type) = size_zero_node;
3951 if (decl_context != PARM
3952 && (array_ptr_quals != NULL_TREE || array_parm_static))
3954 error ("static or type qualifiers in non-parameter array declarator");
3955 array_ptr_quals = NULL_TREE;
3956 array_parm_static = 0;
3959 else if (TREE_CODE (declarator) == CALL_EXPR)
3963 /* Declaring a function type.
3964 Make sure we have a valid type for the function to return. */
3965 if (type == error_mark_node)
3970 /* Warn about some types functions can't return. */
3972 if (TREE_CODE (type) == FUNCTION_TYPE)
3974 error ("`%s' declared as function returning a function", name);
3975 type = integer_type_node;
3977 if (TREE_CODE (type) == ARRAY_TYPE)
3979 error ("`%s' declared as function returning an array", name);
3980 type = integer_type_node;
3983 /* Construct the function type and go to the next
3984 inner layer of declarator. */
3986 arg_types = grokparms (TREE_OPERAND (declarator, 1),
3988 /* Say it's a definition
3989 only for the CALL_EXPR
3990 closest to the identifier. */
3991 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
3992 /* Type qualifiers before the return type of the function
3993 qualify the return type, not the function type. */
3996 /* Type qualifiers on a function return type are normally
3997 permitted by the standard but have no effect, so give a
3998 warning at -Wextra. Qualifiers on a void return type have
3999 meaning as a GNU extension, and are banned on function
4000 definitions in ISO C. FIXME: strictly we shouldn't
4001 pedwarn for qualified void return types except on function
4002 definitions, but not doing so could lead to the undesirable
4003 state of a "volatile void" function return type not being
4004 warned about, and a use of the function being compiled
4005 with GNU semantics, with no diagnostics under -pedantic. */
4006 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4007 pedwarn ("ISO C forbids qualified void function return type");
4008 else if (extra_warnings
4009 && !(VOID_TYPE_P (type)
4010 && type_quals == TYPE_QUAL_VOLATILE))
4011 warning ("type qualifiers ignored on function return type");
4013 type = c_build_qualified_type (type, type_quals);
4015 type_quals = TYPE_UNQUALIFIED;
4017 type = build_function_type (type, arg_types);
4018 declarator = TREE_OPERAND (declarator, 0);
4020 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4021 the formal parameter list of this FUNCTION_TYPE to point to
4022 the FUNCTION_TYPE node itself. */
4027 for (link = last_function_parm_tags;
4029 link = TREE_CHAIN (link))
4030 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4033 else if (TREE_CODE (declarator) == INDIRECT_REF)
4035 /* Merge any constancy or volatility into the target type
4038 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4040 pedwarn ("ISO C forbids qualified function types");
4042 type = c_build_qualified_type (type, type_quals);
4043 type_quals = TYPE_UNQUALIFIED;
4046 type = build_pointer_type (type);
4048 /* Process a list of type modifier keywords
4049 (such as const or volatile) that were given inside the `*'. */
4051 if (TREE_TYPE (declarator))
4059 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4060 typemodlist = TREE_CHAIN (typemodlist))
4062 tree qualifier = TREE_VALUE (typemodlist);
4064 if (C_IS_RESERVED_WORD (qualifier))
4066 if (C_RID_CODE (qualifier) == RID_CONST)
4068 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4070 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4080 error ("invalid type modifier within pointer declarator");
4081 if (constp > 1 && ! flag_isoc99)
4082 pedwarn ("duplicate `const'");
4083 if (volatilep > 1 && ! flag_isoc99)
4084 pedwarn ("duplicate `volatile'");
4085 if (restrictp > 1 && ! flag_isoc99)
4086 pedwarn ("duplicate `restrict'");
4088 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4089 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4090 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4093 declarator = TREE_OPERAND (declarator, 0);
4100 /* Now TYPE has the actual type. */
4102 /* Did array size calculations overflow? */
4104 if (TREE_CODE (type) == ARRAY_TYPE
4105 && COMPLETE_TYPE_P (type)
4106 && TREE_OVERFLOW (TYPE_SIZE (type)))
4108 error ("size of array `%s' is too large", name);
4109 /* If we proceed with the array type as it is, we'll eventually
4110 crash in tree_low_cst(). */
4111 type = error_mark_node;
4114 /* If this is declaring a typedef name, return a TYPE_DECL. */
4116 if (specbits & (1 << (int) RID_TYPEDEF))
4119 /* Note that the grammar rejects storage classes
4120 in typenames, fields or parameters */
4121 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4123 pedwarn ("ISO C forbids qualified function types");
4125 type = c_build_qualified_type (type, type_quals);
4126 decl = build_decl (TYPE_DECL, declarator, type);
4127 if ((specbits & (1 << (int) RID_SIGNED))
4128 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4129 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4130 decl_attributes (&decl, returned_attrs, 0);
4134 /* Detect the case of an array type of unspecified size
4135 which came, as such, direct from a typedef name.
4136 We must copy the type, so that each identifier gets
4137 a distinct type, so that each identifier's size can be
4138 controlled separately by its own initializer. */
4140 if (type != 0 && typedef_type != 0
4141 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4142 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4144 type = build_array_type (TREE_TYPE (type), 0);
4146 C_TYPE_VARIABLE_SIZE (type) = 1;
4149 /* If this is a type name (such as, in a cast or sizeof),
4150 compute the type and return it now. */
4152 if (decl_context == TYPENAME)
4154 /* Note that the grammar rejects storage classes
4155 in typenames, fields or parameters */
4156 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4158 pedwarn ("ISO C forbids const or volatile function types");
4160 type = c_build_qualified_type (type, type_quals);
4161 decl_attributes (&type, returned_attrs, 0);
4165 /* Aside from typedefs and type names (handle above),
4166 `void' at top level (not within pointer)
4167 is allowed only in public variables.
4168 We don't complain about parms either, but that is because
4169 a better error message can be made later. */
4171 if (VOID_TYPE_P (type) && decl_context != PARM
4172 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4173 && ((specbits & (1 << (int) RID_EXTERN))
4174 || (current_scope == global_scope
4176 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4178 error ("variable or field `%s' declared void", name);
4179 type = integer_type_node;
4182 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4183 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4188 if (decl_context == PARM)
4190 tree type_as_written;
4193 /* A parameter declared as an array of T is really a pointer to T.
4194 One declared as a function is really a pointer to a function. */
4196 if (TREE_CODE (type) == ARRAY_TYPE)
4198 /* Transfer const-ness of array into that of type pointed to. */
4199 type = TREE_TYPE (type);
4201 type = c_build_qualified_type (type, type_quals);
4202 type = build_pointer_type (type);
4203 type_quals = TYPE_UNQUALIFIED;
4204 if (array_ptr_quals)
4206 tree new_ptr_quals, new_ptr_attrs;
4208 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4209 /* We don't yet implement attributes in this context. */
4210 if (new_ptr_attrs != NULL_TREE)
4211 warning ("attributes in parameter array declarator ignored");
4216 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4218 tree qualifier = TREE_VALUE (new_ptr_quals);
4220 if (C_IS_RESERVED_WORD (qualifier))
4222 if (C_RID_CODE (qualifier) == RID_CONST)
4224 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4226 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4236 error ("invalid type modifier within array declarator");
4238 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4239 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4240 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4244 else if (TREE_CODE (type) == FUNCTION_TYPE)
4246 if (pedantic && type_quals)
4247 pedwarn ("ISO C forbids qualified function types");
4249 type = c_build_qualified_type (type, type_quals);
4250 type = build_pointer_type (type);
4251 type_quals = TYPE_UNQUALIFIED;
4253 else if (type_quals)
4254 type = c_build_qualified_type (type, type_quals);
4256 type_as_written = type;
4258 decl = build_decl (PARM_DECL, declarator, type);
4260 C_DECL_VARIABLE_SIZE (decl) = 1;
4262 /* Compute the type actually passed in the parmlist,
4263 for the case where there is no prototype.
4264 (For example, shorts and chars are passed as ints.)
4265 When there is a prototype, this is overridden later. */
4267 if (type == error_mark_node)
4268 promoted_type = type;
4270 promoted_type = c_type_promotes_to (type);
4272 DECL_ARG_TYPE (decl) = promoted_type;
4273 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4275 else if (decl_context == FIELD)
4277 /* Structure field. It may not be a function. */
4279 if (TREE_CODE (type) == FUNCTION_TYPE)
4281 error ("field `%s' declared as a function", name);
4282 type = build_pointer_type (type);
4284 else if (TREE_CODE (type) != ERROR_MARK
4285 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4287 error ("field `%s' has incomplete type", name);
4288 type = error_mark_node;
4290 /* Move type qualifiers down to element of an array. */
4291 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4293 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4295 TYPE_DOMAIN (type));
4297 decl = build_decl (FIELD_DECL, declarator, type);
4298 DECL_NONADDRESSABLE_P (decl) = bitfield;
4301 C_DECL_VARIABLE_SIZE (decl) = 1;
4303 else if (TREE_CODE (type) == FUNCTION_TYPE)
4305 /* Every function declaration is "external"
4306 except for those which are inside a function body
4307 in which `auto' is used.
4308 That is a case not specified by ANSI C,
4309 and we use it for forward declarations for nested functions. */
4310 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4311 || current_scope == global_scope);
4313 if (specbits & (1 << (int) RID_AUTO)
4314 && (pedantic || current_scope == global_scope))
4315 pedwarn ("invalid storage class for function `%s'", name);
4316 if (specbits & (1 << (int) RID_REGISTER))
4317 error ("invalid storage class for function `%s'", name);
4318 if (specbits & (1 << (int) RID_THREAD))
4319 error ("invalid storage class for function `%s'", name);
4320 /* Function declaration not at file scope.
4321 Storage classes other than `extern' are not allowed
4322 and `extern' makes no difference. */
4323 if (current_scope != global_scope
4324 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4326 pedwarn ("invalid storage class for function `%s'", name);
4328 decl = build_decl (FUNCTION_DECL, declarator, type);
4329 decl = build_decl_attribute_variant (decl, decl_attr);
4331 DECL_LANG_SPECIFIC (decl)
4332 = ggc_alloc_cleared (sizeof (struct lang_decl));
4334 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4335 pedwarn ("ISO C forbids qualified function types");
4337 /* GNU C interprets a `volatile void' return type to indicate
4338 that the function does not return. */
4339 if ((type_quals & TYPE_QUAL_VOLATILE)
4340 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4341 warning ("`noreturn' function returns non-void value");
4344 DECL_EXTERNAL (decl) = 1;
4345 /* Record absence of global scope for `static' or `auto'. */
4347 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4350 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4352 /* Record presence of `inline', if it is reasonable. */
4353 if (MAIN_NAME_P (declarator))
4356 warning ("cannot inline function `main'");
4360 /* Assume that otherwise the function can be inlined. */
4361 DECL_DECLARED_INLINE_P (decl) = 1;
4363 /* Do not mark bare declarations as DECL_INLINE. Doing so
4364 in the presence of multiple declarations can result in
4365 the abstract origin pointing between the declarations,
4366 which will confuse dwarf2out. */
4369 DECL_INLINE (decl) = 1;
4370 if (specbits & (1 << (int) RID_EXTERN))
4371 current_extern_inline = 1;
4374 /* If -finline-functions, assume it can be inlined. This does
4375 two things: let the function be deferred until it is actually
4376 needed, and let dwarf2 know that the function is inlinable. */
4377 else if (flag_inline_trees == 2 && initialized)
4379 if (!DECL_INLINE (decl))
4380 DID_INLINE_FUNC (decl) = 1;
4381 DECL_INLINE (decl) = 1;
4382 DECL_DECLARED_INLINE_P (decl) = 0;
4387 /* It's a variable. */
4388 /* An uninitialized decl with `extern' is a reference. */
4389 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4391 /* Move type qualifiers down to element of an array. */
4392 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4394 int saved_align = TYPE_ALIGN(type);
4395 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4397 TYPE_DOMAIN (type));
4398 TYPE_ALIGN (type) = saved_align;
4400 else if (type_quals)
4401 type = c_build_qualified_type (type, type_quals);
4403 /* It is invalid to create an `extern' declaration for a
4404 variable if there is a global declaration that is
4406 if (extern_ref && current_scope != global_scope)
4410 global_decl = identifier_global_value (declarator);
4412 && TREE_CODE (global_decl) == VAR_DECL
4413 && !TREE_PUBLIC (global_decl))
4414 error ("variable previously declared `static' redeclared "
4418 decl = build_decl (VAR_DECL, declarator, type);
4420 C_DECL_VARIABLE_SIZE (decl) = 1;
4423 pedwarn ("%Hvariable '%D' declared `inline'",
4424 &DECL_SOURCE_LOCATION (decl), decl);
4426 DECL_EXTERNAL (decl) = extern_ref;
4428 /* At file scope, the presence of a `static' or `register' storage
4429 class specifier, or the absence of all storage class specifiers
4430 makes this declaration a definition (perhaps tentative). Also,
4431 the absence of both `static' and `register' makes it public. */
4432 if (current_scope == global_scope)
4434 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4435 | (1 << (int) RID_REGISTER)));
4436 TREE_STATIC (decl) = !extern_ref;
4438 /* Not at file scope, only `static' makes a static definition. */
4441 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4442 TREE_PUBLIC (decl) = extern_ref;
4445 if (specbits & 1 << (int) RID_THREAD)
4447 if (targetm.have_tls)
4448 DECL_THREAD_LOCAL (decl) = 1;
4450 /* A mere warning is sure to result in improper semantics
4451 at runtime. Don't bother to allow this to compile. */
4452 error ("thread-local storage not supported for this target");
4456 /* Record `register' declaration for warnings on &
4457 and in case doing stupid register allocation. */
4459 if (specbits & (1 << (int) RID_REGISTER))
4460 DECL_REGISTER (decl) = 1;
4462 /* Record constancy and volatility. */
4463 c_apply_type_quals_to_decl (type_quals, decl);
4465 /* If a type has volatile components, it should be stored in memory.
4466 Otherwise, the fact that those components are volatile
4467 will be ignored, and would even crash the compiler. */
4468 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4469 c_mark_addressable (decl);
4471 #ifdef ENABLE_CHECKING
4472 /* This is the earliest point at which we might know the assembler
4473 name of a variable. Thus, if it's known before this, die horribly. */
4474 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4478 decl_attributes (&decl, returned_attrs, 0);
4484 /* Decode the parameter-list info for a function type or function definition.
4485 The argument is the value returned by `get_parm_info' (or made in parse.y
4486 if there is an identifier list instead of a parameter decl list).
4487 These two functions are separate because when a function returns
4488 or receives functions then each is called multiple times but the order
4489 of calls is different. The last call to `grokparms' is always the one
4490 that contains the formal parameter names of a function definition.
4492 Store in `last_function_parms' a chain of the decls of parms.
4493 Also store in `last_function_parm_tags' a chain of the struct, union,
4494 and enum tags declared among the parms.
4496 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4498 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4499 a mere declaration. A nonempty identifier-list gets an error message
4500 when FUNCDEF_FLAG is zero. */
4503 grokparms (tree parms_info, int funcdef_flag)
4505 tree first_parm = TREE_CHAIN (parms_info);
4507 last_function_parms = TREE_PURPOSE (parms_info);
4508 last_function_parm_tags = TREE_VALUE (parms_info);
4510 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4511 && !in_system_header)
4512 warning ("function declaration isn't a prototype");
4515 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4518 pedwarn ("parameter names (without types) in function declaration");
4520 last_function_parms = first_parm;
4527 /* If the arg types are incomplete in a declaration,
4528 they must include undefined tags.
4529 These tags can never be defined in the scope of the declaration,
4530 so the types can never be completed,
4531 and no call can be compiled successfully. */
4532 for (parm = last_function_parms, typelt = first_parm;
4534 parm = TREE_CHAIN (parm))
4535 /* Skip over any enumeration constants declared here. */
4536 if (TREE_CODE (parm) == PARM_DECL)
4538 /* Barf if the parameter itself has an incomplete type. */
4539 tree type = TREE_VALUE (typelt);
4540 if (type == error_mark_node)
4542 if (!COMPLETE_TYPE_P (type))
4544 if (funcdef_flag && DECL_NAME (parm) != 0)
4545 error ("parameter `%s' has incomplete type",
4546 IDENTIFIER_POINTER (DECL_NAME (parm)));
4548 warning ("parameter has incomplete type");
4551 TREE_VALUE (typelt) = error_mark_node;
4552 TREE_TYPE (parm) = error_mark_node;
4555 typelt = TREE_CHAIN (typelt);
4562 /* Return a tree_list node with info on a parameter list just parsed.
4563 The TREE_PURPOSE is a chain of decls of those parms.
4564 The TREE_VALUE is a list of structure, union and enum tags defined.
4565 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4566 This tree_list node is later fed to `grokparms'.
4568 VOID_AT_END nonzero means append `void' to the end of the type-list.
4569 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4572 get_parm_info (int void_at_end)
4577 tree tags = gettags ();
4578 tree parms = getdecls ();
4580 tree order = current_scope->parm_order;
4582 /* Just `void' (and no ellipsis) is special. There are really no parms.
4583 But if the `void' is qualified (by `const' or `volatile') or has a
4584 storage class specifier (`register'), then the behavior is undefined;
4585 by not counting it as the special case of `void' we will cause an
4586 error later. Typedefs for `void' are OK (see DR#157). */
4587 if (void_at_end && parms != 0
4588 && TREE_CHAIN (parms) == 0
4589 && VOID_TYPE_P (TREE_TYPE (parms))
4590 && ! TREE_THIS_VOLATILE (parms)
4591 && ! TREE_READONLY (parms)
4592 && ! DECL_REGISTER (parms)
4593 && DECL_NAME (parms) == 0)
4596 storedecls (NULL_TREE);
4597 return tree_cons (NULL_TREE, NULL_TREE,
4598 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4601 /* Extract enumerator values and other non-parms declared with the parms.
4602 Likewise any forward parm decls that didn't have real parm decls. */
4603 for (decl = parms; decl;)
4605 tree next = TREE_CHAIN (decl);
4607 if (TREE_CODE (decl) != PARM_DECL)
4609 TREE_CHAIN (decl) = new_parms;
4612 else if (TREE_ASM_WRITTEN (decl))
4614 error ("%Hparameter '%D' has just a forward declaration",
4615 &DECL_SOURCE_LOCATION (decl), decl);
4616 TREE_CHAIN (decl) = new_parms;
4622 /* Put the parm decls back in the order they were in in the parm list. */
4623 for (t = order; t; t = TREE_CHAIN (t))
4626 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4628 TREE_CHAIN (TREE_VALUE (t)) = 0;
4631 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4634 /* Store the parmlist in the scope structure since the old one
4635 is no longer a valid list. (We have changed the chain pointers.) */
4636 storedecls (new_parms);
4638 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4639 /* There may also be declarations for enumerators if an enumeration
4640 type is declared among the parms. Ignore them here. */
4641 if (TREE_CODE (decl) == PARM_DECL)
4643 /* Since there is a prototype,
4644 args are passed in their declared types. */
4645 tree type = TREE_TYPE (decl);
4646 DECL_ARG_TYPE (decl) = type;
4647 if (PROMOTE_PROTOTYPES
4648 && INTEGRAL_TYPE_P (type)
4649 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4650 DECL_ARG_TYPE (decl) = integer_type_node;
4652 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4653 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
4654 && DECL_NAME (decl) == 0)
4656 error ("`void' in parameter list must be the entire list");
4662 return tree_cons (new_parms, tags,
4663 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
4665 return tree_cons (new_parms, tags, nreverse (types));
4668 /* At end of parameter list, warn about any struct, union or enum tags
4669 defined within. Do so because these types cannot ever become complete. */
4672 parmlist_tags_warning (void)
4677 for (elt = current_scope->tags; elt; elt = TREE_CHAIN (elt))
4679 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4680 /* An anonymous union parm type is meaningful as a GNU extension.
4681 So don't warn for that. */
4682 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
4684 if (TREE_PURPOSE (elt) != 0)
4686 if (code == RECORD_TYPE)
4687 warning ("`struct %s' declared inside parameter list",
4688 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4689 else if (code == UNION_TYPE)
4690 warning ("`union %s' declared inside parameter list",
4691 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4693 warning ("`enum %s' declared inside parameter list",
4694 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4698 /* For translation these need to be separate warnings */
4699 if (code == RECORD_TYPE)
4700 warning ("anonymous struct declared inside parameter list");
4701 else if (code == UNION_TYPE)
4702 warning ("anonymous union declared inside parameter list");
4704 warning ("anonymous enum declared inside parameter list");
4708 warning ("its scope is only this definition or declaration, which is probably not what you want");
4714 /* Get the struct, enum or union (CODE says which) with tag NAME.
4715 Define the tag as a forward-reference if it is not defined. */
4718 xref_tag (enum tree_code code, tree name)
4720 /* If a cross reference is requested, look up the type
4721 already defined for this tag and return it. */
4723 tree ref = lookup_tag (code, name, 0);
4724 /* If this is the right type of tag, return what we found.
4725 (This reference will be shadowed by shadow_tag later if appropriate.)
4726 If this is the wrong type of tag, do not return it. If it was the
4727 wrong type in the same scope, we will have had an error
4728 message already; if in a different scope and declaring
4729 a name, pending_xref_error will give an error message; but if in a
4730 different scope and not declaring a name, this tag should
4731 shadow the previous declaration of a different type of tag, and
4732 this would not work properly if we return the reference found.
4733 (For example, with "struct foo" in an outer scope, "union foo;"
4734 must shadow that tag with a new one of union type.) */
4735 if (ref && TREE_CODE (ref) == code)
4738 /* If no such tag is yet defined, create a forward-reference node
4739 and record it as the "definition".
4740 When a real declaration of this type is found,
4741 the forward-reference will be altered into a real type. */
4743 ref = make_node (code);
4744 if (code == ENUMERAL_TYPE)
4746 /* Give the type a default layout like unsigned int
4747 to avoid crashing if it does not get defined. */
4748 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4749 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4750 TYPE_USER_ALIGN (ref) = 0;
4751 TREE_UNSIGNED (ref) = 1;
4752 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4753 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4754 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4757 pushtag (name, ref);
4762 /* Make sure that the tag NAME is defined *in the current scope*
4763 at least as a forward reference.
4764 CODE says which kind of tag NAME ought to be. */
4767 start_struct (enum tree_code code, tree name)
4769 /* If there is already a tag defined at this scope
4770 (as a forward reference), just return it. */
4775 ref = lookup_tag (code, name, 1);
4776 if (ref && TREE_CODE (ref) == code)
4778 if (TYPE_FIELDS (ref))
4780 if (code == UNION_TYPE)
4781 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4783 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4788 /* Otherwise create a forward-reference just so the tag is in scope. */
4790 ref = make_node (code);
4791 pushtag (name, ref);
4794 C_TYPE_BEING_DEFINED (ref) = 1;
4795 TYPE_PACKED (ref) = flag_pack_struct;
4799 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4800 of a structure component, returning a FIELD_DECL node.
4801 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4803 This is done during the parsing of the struct declaration.
4804 The FIELD_DECL nodes are chained together and the lot of them
4805 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4808 grokfield (tree declarator, tree declspecs, tree width)
4812 if (declarator == NULL_TREE && width == NULL_TREE)
4814 /* This is an unnamed decl.
4816 If we have something of the form "union { list } ;" then this
4817 is the anonymous union extension. Similarly for struct.
4819 If this is something of the form "struct foo;", then
4820 If MS extensions are enabled, this is handled as an
4822 Otherwise this is a forward declaration of a structure tag.
4824 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4825 If MS extensions are enabled and foo names a structure, then
4826 again this is an anonymous struct.
4827 Otherwise this is an error.
4829 Oh what a horrid tangled web we weave. I wonder if MS consciously
4830 took this from Plan 9 or if it was an accident of implementation
4831 that took root before someone noticed the bug... */
4833 tree type = TREE_VALUE (declspecs);
4835 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4836 type = TREE_TYPE (type);
4837 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4839 if (flag_ms_extensions)
4842 goto warn_unnamed_field;
4843 else if (TYPE_NAME (type) == NULL)
4846 goto warn_unnamed_field;
4851 warning ("declaration does not declare anything");
4856 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4858 finish_decl (value, NULL_TREE, NULL_TREE);
4859 DECL_INITIAL (value) = width;
4861 if (c_dialect_objc ())
4862 objc_check_decl (value);
4866 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4867 the list such that this does not present a problem later. */
4870 detect_field_duplicates (tree fieldlist)
4875 /* First, see if there are more than "a few" fields.
4876 This is trivially true if there are zero or one fields. */
4879 x = TREE_CHAIN (fieldlist);
4885 } while (timeout > 0 && x);
4887 /* If there were "few" fields, avoid the overhead of allocating
4888 a hash table. Instead just do the nested traversal thing. */
4891 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4894 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4895 if (DECL_NAME (y) == DECL_NAME (x))
4897 error ("%Hduplicate member '%D'",
4898 &DECL_SOURCE_LOCATION (x), x);
4899 DECL_NAME (x) = NULL_TREE;
4905 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4908 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4909 if ((y = DECL_NAME (x)) != 0)
4911 slot = htab_find_slot (htab, y, INSERT);
4914 error ("%Hduplicate member '%D'",
4915 &DECL_SOURCE_LOCATION (x), x);
4916 DECL_NAME (x) = NULL_TREE;
4925 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4926 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4927 ATTRIBUTES are attributes to be applied to the structure. */
4930 finish_struct (tree t, tree fieldlist, tree attributes)
4933 int toplevel = global_scope == current_scope;
4934 int saw_named_field;
4936 /* If this type was previously laid out as a forward reference,
4937 make sure we lay it out again. */
4941 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4943 /* Nameless union parm types are useful as GCC extension. */
4944 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4945 /* Otherwise, warn about any struct or union def. in parmlist. */
4946 if (in_parm_level_p ())
4949 pedwarn ("%s defined inside parms",
4950 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4952 warning ("%s defined inside parms",
4953 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4958 for (x = fieldlist; x; x = TREE_CHAIN (x))
4959 if (DECL_NAME (x) != 0)
4963 pedwarn ("%s has no %s",
4964 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4965 fieldlist ? _("named members") : _("members"));
4968 /* Install struct as DECL_CONTEXT of each field decl.
4969 Also process specified field sizes,m which is found in the DECL_INITIAL.
4970 Store 0 there, except for ": 0" fields (so we can find them
4971 and delete them, below). */
4973 saw_named_field = 0;
4974 for (x = fieldlist; x; x = TREE_CHAIN (x))
4976 DECL_CONTEXT (x) = t;
4977 DECL_PACKED (x) |= TYPE_PACKED (t);
4979 /* If any field is const, the structure type is pseudo-const. */
4980 if (TREE_READONLY (x))
4981 C_TYPE_FIELDS_READONLY (t) = 1;
4984 /* A field that is pseudo-const makes the structure likewise. */
4985 tree t1 = TREE_TYPE (x);
4986 while (TREE_CODE (t1) == ARRAY_TYPE)
4987 t1 = TREE_TYPE (t1);
4988 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4989 && C_TYPE_FIELDS_READONLY (t1))
4990 C_TYPE_FIELDS_READONLY (t) = 1;
4993 /* Any field that is volatile means variables of this type must be
4994 treated in some ways as volatile. */
4995 if (TREE_THIS_VOLATILE (x))
4996 C_TYPE_FIELDS_VOLATILE (t) = 1;
4998 /* Any field of nominal variable size implies structure is too. */
4999 if (C_DECL_VARIABLE_SIZE (x))
5000 C_TYPE_VARIABLE_SIZE (t) = 1;
5002 /* Detect invalid nested redefinition. */
5003 if (TREE_TYPE (x) == t)
5004 error ("nested redefinition of `%s'",
5005 IDENTIFIER_POINTER (TYPE_NAME (t)));
5007 /* Detect invalid bit-field size. */
5008 if (DECL_INITIAL (x))
5009 STRIP_NOPS (DECL_INITIAL (x));
5010 if (DECL_INITIAL (x))
5012 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5013 constant_expression_warning (DECL_INITIAL (x));
5016 error ("%Hbit-field '%D' width not an integer constant",
5017 &DECL_SOURCE_LOCATION (x), x);
5018 DECL_INITIAL (x) = NULL;
5022 /* Detect invalid bit-field type. */
5023 if (DECL_INITIAL (x)
5024 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5025 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5026 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5028 error ("%Hbit-field '%D' has invalid type",
5029 &DECL_SOURCE_LOCATION (x), x);
5030 DECL_INITIAL (x) = NULL;
5033 if (DECL_INITIAL (x) && pedantic
5034 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5035 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5036 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5037 /* Accept an enum that's equivalent to int or unsigned int. */
5038 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5039 && (TYPE_PRECISION (TREE_TYPE (x))
5040 == TYPE_PRECISION (integer_type_node))))
5041 pedwarn ("%Hbit-field '%D' type invalid in ISO C",
5042 &DECL_SOURCE_LOCATION (x), x);
5044 /* Detect and ignore out of range field width and process valid
5046 if (DECL_INITIAL (x))
5049 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
5050 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5052 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5053 error ("%Hnegative width in bit-field '%D'",
5054 &DECL_SOURCE_LOCATION (x), x);
5055 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5056 pedwarn ("%Hwidth of '%D' exceeds its type",
5057 &DECL_SOURCE_LOCATION (x), x);
5058 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5059 error ("%Hzero width for bit-field '%D'",
5060 &DECL_SOURCE_LOCATION (x), x);
5063 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5064 unsigned HOST_WIDE_INT width
5065 = tree_low_cst (DECL_INITIAL (x), 1);
5067 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5068 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5069 TREE_UNSIGNED (TREE_TYPE (x)))
5071 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5072 TREE_UNSIGNED (TREE_TYPE (x))))))
5073 warning ("%H'%D' is narrower than values of its type",
5074 &DECL_SOURCE_LOCATION (x), x);
5076 DECL_SIZE (x) = bitsize_int (width);
5077 DECL_BIT_FIELD (x) = 1;
5078 SET_DECL_C_BIT_FIELD (x);
5082 DECL_INITIAL (x) = 0;
5084 /* Detect flexible array member in an invalid context. */
5085 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5086 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5087 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5088 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5090 if (TREE_CODE (t) == UNION_TYPE)
5091 error ("%Hflexible array member in union",
5092 &DECL_SOURCE_LOCATION (x));
5093 else if (TREE_CHAIN (x) != NULL_TREE)
5094 error ("%Hflexible array member not at end of struct",
5095 &DECL_SOURCE_LOCATION (x));
5096 else if (! saw_named_field)
5097 error ("%Hflexible array member in otherwise empty struct",
5098 &DECL_SOURCE_LOCATION (x));
5101 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5102 && flexible_array_type_p (TREE_TYPE (x)))
5103 pedwarn ("%Hinvalid use of structure with flexible array member",
5104 &DECL_SOURCE_LOCATION (x));
5107 saw_named_field = 1;
5110 detect_field_duplicates (fieldlist);
5112 /* Now we have the nearly final fieldlist. Record it,
5113 then lay out the structure or union (including the fields). */
5115 TYPE_FIELDS (t) = fieldlist;
5119 /* Delete all zero-width bit-fields from the fieldlist */
5121 tree *fieldlistp = &fieldlist;
5123 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5124 *fieldlistp = TREE_CHAIN (*fieldlistp);
5126 fieldlistp = &TREE_CHAIN (*fieldlistp);
5129 /* Now we have the truly final field list.
5130 Store it in this type and in the variants. */
5132 TYPE_FIELDS (t) = fieldlist;
5134 /* If there are lots of fields, sort so we can look through them fast.
5135 We arbitrarily consider 16 or more elts to be "a lot". */
5140 for (x = fieldlist; x; x = TREE_CHAIN (x))
5142 if (len > 15 || DECL_NAME (x) == NULL)
5150 struct lang_type *space;
5151 struct sorted_fields_type *space2;
5153 len += list_length (x);
5155 /* Use the same allocation policy here that make_node uses, to
5156 ensure that this lives as long as the rest of the struct decl.
5157 All decls in an inline function need to be saved. */
5159 space = ggc_alloc (sizeof (struct lang_type));
5160 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5164 field_array = &space2->elts[0];
5165 for (x = fieldlist; x; x = TREE_CHAIN (x))
5167 field_array[len++] = x;
5169 /* If there is anonymous struct or union, break out of the loop. */
5170 if (DECL_NAME (x) == NULL)
5173 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5176 TYPE_LANG_SPECIFIC (t) = space;
5177 TYPE_LANG_SPECIFIC (t)->s->len = len;
5178 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5179 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5184 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5186 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5187 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5188 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5189 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5192 /* If this was supposed to be a transparent union, but we can't
5193 make it one, warn and turn off the flag. */
5194 if (TREE_CODE (t) == UNION_TYPE
5195 && TYPE_TRANSPARENT_UNION (t)
5196 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5198 TYPE_TRANSPARENT_UNION (t) = 0;
5199 warning ("union cannot be made transparent");
5202 /* If this structure or union completes the type of any previous
5203 variable declaration, lay it out and output its rtl. */
5205 if (current_scope->incomplete_list != NULL_TREE)
5207 tree prev = NULL_TREE;
5209 for (x = current_scope->incomplete_list; x; x = TREE_CHAIN (x))
5211 tree decl = TREE_VALUE (x);
5213 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5214 && TREE_CODE (decl) != TYPE_DECL)
5216 layout_decl (decl, 0);
5217 /* This is a no-op in c-lang.c or something real in objc-act.c. */
5218 if (c_dialect_objc ())
5219 objc_check_decl (decl);
5220 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5223 /* Unlink X from the incomplete list. */
5225 TREE_CHAIN (prev) = TREE_CHAIN (x);
5227 current_scope->incomplete_list = TREE_CHAIN (x);
5229 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5230 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5232 tree element = TREE_TYPE (decl);
5233 while (TREE_CODE (element) == ARRAY_TYPE)
5234 element = TREE_TYPE (element);
5237 layout_array_type (TREE_TYPE (decl));
5238 if (TREE_CODE (decl) != TYPE_DECL)
5240 layout_decl (decl, 0);
5241 if (c_dialect_objc ())
5242 objc_check_decl (decl);
5243 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5247 /* Unlink X from the incomplete list. */
5249 TREE_CHAIN (prev) = TREE_CHAIN (x);
5251 current_scope->incomplete_list = TREE_CHAIN (x);
5257 /* Finish debugging output for this type. */
5258 rest_of_type_compilation (t, toplevel);
5263 /* Lay out the type T, and its element type, and so on. */
5266 layout_array_type (tree t)
5268 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5269 layout_array_type (TREE_TYPE (t));
5273 /* Begin compiling the definition of an enumeration type.
5274 NAME is its name (or null if anonymous).
5275 Returns the type object, as yet incomplete.
5276 Also records info about it so that build_enumerator
5277 may be used to declare the individual values as they are read. */
5280 start_enum (tree name)
5284 /* If this is the real definition for a previous forward reference,
5285 fill in the contents in the same object that used to be the
5286 forward reference. */
5289 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5291 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5293 enumtype = make_node (ENUMERAL_TYPE);
5294 pushtag (name, enumtype);
5297 C_TYPE_BEING_DEFINED (enumtype) = 1;
5299 if (TYPE_VALUES (enumtype) != 0)
5301 /* This enum is a named one that has been declared already. */
5302 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5304 /* Completely replace its old definition.
5305 The old enumerators remain defined, however. */
5306 TYPE_VALUES (enumtype) = 0;
5309 enum_next_value = integer_zero_node;
5312 if (flag_short_enums)
5313 TYPE_PACKED (enumtype) = 1;
5318 /* After processing and defining all the values of an enumeration type,
5319 install their decls in the enumeration type and finish it off.
5320 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5321 and ATTRIBUTES are the specified attributes.
5322 Returns ENUMTYPE. */
5325 finish_enum (tree enumtype, tree values, tree attributes)
5328 tree minnode = 0, maxnode = 0, enum_value_type;
5329 int precision, unsign;
5330 int toplevel = (global_scope == current_scope);
5332 if (in_parm_level_p ())
5333 warning ("enum defined inside parms");
5335 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5337 /* Calculate the maximum value of any enumerator in this type. */
5339 if (values == error_mark_node)
5340 minnode = maxnode = integer_zero_node;
5343 minnode = maxnode = TREE_VALUE (values);
5344 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5346 tree value = TREE_VALUE (pair);
5347 if (tree_int_cst_lt (maxnode, value))
5349 if (tree_int_cst_lt (value, minnode))
5354 /* Construct the final type of this enumeration. It is the same
5355 as one of the integral types - the narrowest one that fits, except
5356 that normally we only go as narrow as int - and signed iff any of
5357 the values are negative. */
5358 unsign = (tree_int_cst_sgn (minnode) >= 0);
5359 precision = MAX (min_precision (minnode, unsign),
5360 min_precision (maxnode, unsign));
5361 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5363 tree narrowest = c_common_type_for_size (precision, unsign);
5366 warning ("enumeration values exceed range of largest integer");
5367 narrowest = long_long_integer_type_node;
5370 precision = TYPE_PRECISION (narrowest);
5373 precision = TYPE_PRECISION (integer_type_node);
5375 if (precision == TYPE_PRECISION (integer_type_node))
5376 enum_value_type = c_common_type_for_size (precision, 0);
5378 enum_value_type = enumtype;
5380 TYPE_MIN_VALUE (enumtype) = minnode;
5381 TYPE_MAX_VALUE (enumtype) = maxnode;
5382 TYPE_PRECISION (enumtype) = precision;
5383 TREE_UNSIGNED (enumtype) = unsign;
5384 TYPE_SIZE (enumtype) = 0;
5385 layout_type (enumtype);
5387 if (values != error_mark_node)
5389 /* Change the type of the enumerators to be the enum type. We
5390 need to do this irrespective of the size of the enum, for
5391 proper type checking. Replace the DECL_INITIALs of the
5392 enumerators, and the value slots of the list, with copies
5393 that have the enum type; they cannot be modified in place
5394 because they may be shared (e.g. integer_zero_node) Finally,
5395 change the purpose slots to point to the names of the decls. */
5396 for (pair = values; pair; pair = TREE_CHAIN (pair))
5398 tree enu = TREE_PURPOSE (pair);
5400 TREE_TYPE (enu) = enumtype;
5402 /* The ISO C Standard mandates enumerators to have type int,
5403 even though the underlying type of an enum type is
5404 unspecified. Here we convert any enumerators that fit in
5405 an int to type int, to avoid promotions to unsigned types
5406 when comparing integers with enumerators that fit in the
5407 int range. When -pedantic is given, build_enumerator()
5408 would have already taken care of those that don't fit. */
5409 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5410 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5412 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5414 TREE_PURPOSE (pair) = DECL_NAME (enu);
5415 TREE_VALUE (pair) = DECL_INITIAL (enu);
5418 TYPE_VALUES (enumtype) = values;
5421 /* Fix up all variant types of this enum type. */
5422 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5424 if (tem == enumtype)
5426 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5427 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5428 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5429 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5430 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5431 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5432 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5433 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5434 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5435 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5438 /* Finish debugging output for this type. */
5439 rest_of_type_compilation (enumtype, toplevel);
5444 /* Build and install a CONST_DECL for one value of the
5445 current enumeration type (one that was begun with start_enum).
5446 Return a tree-list containing the CONST_DECL and its value.
5447 Assignment of sequential values by default is handled here. */
5450 build_enumerator (tree name, tree value)
5454 /* Validate and default VALUE. */
5456 /* Remove no-op casts from the value. */
5458 STRIP_TYPE_NOPS (value);
5462 if (TREE_CODE (value) == INTEGER_CST)
5464 value = default_conversion (value);
5465 constant_expression_warning (value);
5469 error ("enumerator value for `%s' not integer constant",
5470 IDENTIFIER_POINTER (name));
5475 /* Default based on previous value. */
5476 /* It should no longer be possible to have NON_LVALUE_EXPR
5480 value = enum_next_value;
5482 error ("overflow in enumeration values");
5485 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5487 pedwarn ("ISO C restricts enumerator values to range of `int'");
5488 value = convert (integer_type_node, value);
5491 /* Set basis for default for next value. */
5492 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5493 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5495 /* Now create a declaration for the enum value name. */
5497 type = TREE_TYPE (value);
5498 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5499 TYPE_PRECISION (integer_type_node)),
5500 (TYPE_PRECISION (type)
5501 >= TYPE_PRECISION (integer_type_node)
5502 && TREE_UNSIGNED (type)));
5504 decl = build_decl (CONST_DECL, name, type);
5505 DECL_INITIAL (decl) = convert (type, value);
5508 return tree_cons (decl, value, NULL_TREE);
5512 /* Create the FUNCTION_DECL for a function definition.
5513 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5514 the declaration; they describe the function's name and the type it returns,
5515 but twisted together in a fashion that parallels the syntax of C.
5517 This function creates a binding context for the function body
5518 as well as setting up the FUNCTION_DECL in current_function_decl.
5520 Returns 1 on success. If the DECLARATOR is not suitable for a function
5521 (it defines a datum instead), we return 0, which tells
5522 yyparse to report a parse error. */
5525 start_function (tree declspecs, tree declarator, tree attributes)
5527 tree decl1, old_decl;
5529 int old_immediate_size_expand = immediate_size_expand;
5531 current_function_returns_value = 0; /* Assume, until we see it does. */
5532 current_function_returns_null = 0;
5533 current_function_returns_abnormally = 0;
5534 warn_about_return_type = 0;
5535 current_extern_inline = 0;
5537 /* Don't expand any sizes in the return type of the function. */
5538 immediate_size_expand = 0;
5540 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5542 /* If the declarator is not suitable for a function definition,
5543 cause a syntax error. */
5546 immediate_size_expand = old_immediate_size_expand;
5550 decl_attributes (&decl1, attributes, 0);
5552 if (DECL_DECLARED_INLINE_P (decl1)
5553 && DECL_UNINLINABLE (decl1)
5554 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5555 warning ("%Hinline function '%D' given attribute noinline",
5556 &DECL_SOURCE_LOCATION (decl1), decl1);
5558 announce_function (decl1);
5560 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5562 error ("return type is an incomplete type");
5563 /* Make it return void instead. */
5565 = build_function_type (void_type_node,
5566 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5569 if (warn_about_return_type)
5570 pedwarn_c99 ("return type defaults to `int'");
5572 /* Save the parm names or decls from this function's declarator
5573 where store_parm_decls will find them. */
5574 current_function_parms = last_function_parms;
5575 current_function_parm_tags = last_function_parm_tags;
5577 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5578 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5579 DECL_INITIAL (decl1) = error_mark_node;
5581 /* If this definition isn't a prototype and we had a prototype declaration
5582 before, copy the arg type info from that prototype.
5583 But not if what we had before was a builtin function. */
5584 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5585 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5586 && !DECL_BUILT_IN (old_decl)
5587 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5588 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5589 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5591 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5592 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5595 /* Optionally warn of old-fashioned def with no previous prototype. */
5596 if (warn_strict_prototypes
5597 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5598 && C_DECL_ISNT_PROTOTYPE (old_decl))
5599 warning ("function declaration isn't a prototype");
5600 /* Optionally warn of any global def with no previous prototype. */
5601 else if (warn_missing_prototypes
5602 && TREE_PUBLIC (decl1)
5603 && ! MAIN_NAME_P (DECL_NAME (decl1))
5604 && C_DECL_ISNT_PROTOTYPE (old_decl))
5605 warning ("%Hno previous prototype for '%D'",
5606 &DECL_SOURCE_LOCATION (decl1), decl1);
5607 /* Optionally warn of any def with no previous prototype
5608 if the function has already been used. */
5609 else if (warn_missing_prototypes
5610 && old_decl != 0 && TREE_USED (old_decl)
5611 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5612 warning ("%H'%D' was used with no prototype before its definition",
5613 &DECL_SOURCE_LOCATION (decl1), decl1);
5614 /* Optionally warn of any global def with no previous declaration. */
5615 else if (warn_missing_declarations
5616 && TREE_PUBLIC (decl1)
5618 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5619 warning ("%Hno previous declaration for '%D'",
5620 &DECL_SOURCE_LOCATION (decl1), decl1);
5621 /* Optionally warn of any def with no previous declaration
5622 if the function has already been used. */
5623 else if (warn_missing_declarations
5624 && old_decl != 0 && TREE_USED (old_decl)
5625 && C_DECL_IMPLICIT (old_decl))
5626 warning ("%H`%D' was used with no declaration before its definition",
5627 &DECL_SOURCE_LOCATION (decl1), decl1);
5629 /* This is a definition, not a reference.
5630 So normally clear DECL_EXTERNAL.
5631 However, `extern inline' acts like a declaration
5632 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5633 DECL_EXTERNAL (decl1) = current_extern_inline;
5635 /* This function exists in static storage.
5636 (This does not mean `static' in the C sense!) */
5637 TREE_STATIC (decl1) = 1;
5639 /* A nested function is not global. */
5640 if (current_function_decl != 0)
5641 TREE_PUBLIC (decl1) = 0;
5643 #ifdef ENABLE_CHECKING
5644 /* This is the earliest point at which we might know the assembler
5645 name of the function. Thus, if it's set before this, die horribly. */
5646 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5650 /* If #pragma weak was used, mark the decl weak now. */
5651 if (current_scope == global_scope)
5652 maybe_apply_pragma_weak (decl1);
5654 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5655 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5659 const location_t *locus = &DECL_SOURCE_LOCATION (decl1);
5661 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5662 != integer_type_node)
5663 pedwarn ("%Hreturn type of '%D' is not `int'", locus, decl1);
5665 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5666 args = TREE_CHAIN (args))
5668 tree type = args ? TREE_VALUE (args) : 0;
5670 if (type == void_type_node)
5677 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5678 pedwarn ("%Hfirst argument of '%D' should be `int'",
5683 if (TREE_CODE (type) != POINTER_TYPE
5684 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5685 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5687 pedwarn ("%Hsecond argument of '%D' should be 'char **'",
5692 if (TREE_CODE (type) != POINTER_TYPE
5693 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5694 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5696 pedwarn ("%Hthird argument of '%D' should probably be "
5697 "'char **'", locus, decl1);
5702 /* It is intentional that this message does not mention the third
5703 argument because it's only mentioned in an appendix of the
5705 if (argct > 0 && (argct < 2 || argct > 3))
5706 pedwarn ("%H'%D' takes only zero or two arguments", locus, decl1);
5708 if (! TREE_PUBLIC (decl1))
5709 pedwarn ("%H'%D' is normally a non-static function", locus, decl1);
5712 /* Record the decl so that the function name is defined.
5713 If we already have a decl for this name, and it is a FUNCTION_DECL,
5714 use the old decl. */
5716 current_function_decl = pushdecl (decl1);
5719 declare_parm_level ();
5721 make_decl_rtl (current_function_decl, NULL);
5723 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5724 /* Promote the value to int before returning it. */
5725 if (c_promoting_integer_type_p (restype))
5727 /* It retains unsignedness if not really getting wider. */
5728 if (TREE_UNSIGNED (restype)
5729 && (TYPE_PRECISION (restype)
5730 == TYPE_PRECISION (integer_type_node)))
5731 restype = unsigned_type_node;
5733 restype = integer_type_node;
5735 DECL_RESULT (current_function_decl)
5736 = build_decl (RESULT_DECL, NULL_TREE, restype);
5738 /* If this fcn was already referenced via a block-scope `extern' decl
5739 (or an implicit decl), propagate certain information about the usage. */
5740 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5741 TREE_ADDRESSABLE (current_function_decl) = 1;
5743 immediate_size_expand = old_immediate_size_expand;
5745 start_fname_decls ();
5750 /* Store the parameter declarations into the current function declaration.
5751 This is called after parsing the parameter declarations, before
5752 digesting the body of the function.
5754 For an old-style definition, modify the function's type
5755 to specify at least the number of arguments. */
5758 store_parm_decls (void)
5760 tree fndecl = current_function_decl;
5763 /* This is either a chain of PARM_DECLs (if a prototype was used)
5764 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5765 tree specparms = current_function_parms;
5767 /* This is a list of types declared among parms in a prototype. */
5768 tree parmtags = current_function_parm_tags;
5770 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5771 tree parmdecls = getdecls ();
5773 /* This is a chain of any other decls that came in among the parm
5774 declarations. If a parm is declared with enum {foo, bar} x;
5775 then CONST_DECLs for foo and bar are put here. */
5778 /* The function containing FNDECL, if any. */
5779 tree context = decl_function_context (fndecl);
5781 /* Nonzero if this definition is written with a prototype. */
5784 bool saved_warn_shadow = warn_shadow;
5786 /* Don't re-emit shadow warnings. */
5787 warn_shadow = false;
5789 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5791 /* This case is when the function was defined with an ANSI prototype.
5792 The parms already have decls, so we need not do anything here
5793 except record them as in effect
5794 and complain if any redundant old-style parm decls were written. */
5805 error ("%Hparm types given both in parmlist and separately",
5806 &DECL_SOURCE_LOCATION (fndecl));
5807 /* Get rid of the erroneous decls; don't keep them on
5808 the list of parms, since they might not be PARM_DECLs. */
5809 for (decl = current_scope->names;
5810 decl; decl = TREE_CHAIN (decl))
5811 if (DECL_NAME (decl))
5812 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = 0;
5813 for (link = current_scope->shadowed;
5814 link; link = TREE_CHAIN (link))
5815 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5816 current_scope->names = 0;
5817 current_scope->shadowed = 0;
5820 specparms = nreverse (specparms);
5821 for (parm = specparms; parm; parm = next)
5823 const location_t *locus = &DECL_SOURCE_LOCATION (parm);
5824 next = TREE_CHAIN (parm);
5825 if (TREE_CODE (parm) == PARM_DECL)
5827 if (DECL_NAME (parm) == 0)
5828 error ("%Hparameter name omitted", locus);
5829 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
5830 && VOID_TYPE_P (TREE_TYPE (parm)))
5832 error ("%Hparameter '%D' declared void", locus, parm);
5833 /* Change the type to error_mark_node so this parameter
5834 will be ignored by assign_parms. */
5835 TREE_TYPE (parm) = error_mark_node;
5841 /* If we find an enum constant or a type tag,
5842 put it aside for the moment. */
5843 TREE_CHAIN (parm) = 0;
5844 others = chainon (others, parm);
5848 /* Get the decls in their original chain order
5849 and record in the function. */
5850 DECL_ARGUMENTS (fndecl) = getdecls ();
5852 /* Now pushdecl the enum constants. */
5853 for (parm = others; parm; parm = next)
5855 next = TREE_CHAIN (parm);
5856 if (DECL_NAME (parm) == 0)
5858 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5860 else if (TREE_CODE (parm) != PARM_DECL)
5864 storetags (chainon (parmtags, gettags ()));
5868 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5869 each with a parm name as the TREE_VALUE.
5871 PARMDECLS is a chain of declarations for parameters.
5872 Warning! It can also contain CONST_DECLs which are not parameters
5873 but are names of enumerators of any enum types
5874 declared among the parameters.
5876 First match each formal parameter name with its declaration.
5877 Associate decls with the names and store the decls
5878 into the TREE_PURPOSE slots. */
5880 /* We use DECL_WEAK as a flag to show which parameters have been
5881 seen already since it is not used on PARM_DECL or CONST_DECL. */
5882 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5883 DECL_WEAK (parm) = 0;
5885 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5887 tree tail, found = NULL;
5889 if (TREE_VALUE (parm) == 0)
5891 error ("%Hparameter name missing from parameter list",
5892 &DECL_SOURCE_LOCATION (fndecl));
5893 TREE_PURPOSE (parm) = 0;
5897 /* See if any of the parmdecls specifies this parm by name.
5898 Ignore any enumerator decls. */
5899 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5900 if (DECL_NAME (tail) == TREE_VALUE (parm)
5901 && TREE_CODE (tail) == PARM_DECL)
5907 /* If declaration already marked, we have a duplicate name.
5908 Complain, and don't use this decl twice. */
5909 if (found && DECL_WEAK (found))
5911 error ("%Hmultiple parameters named '%D'",
5912 &DECL_SOURCE_LOCATION (found), found);
5916 /* If the declaration says "void", complain and ignore it. */
5917 if (found && VOID_TYPE_P (TREE_TYPE (found)))
5919 error ("%Hparameter '%D' declared void",
5920 &DECL_SOURCE_LOCATION (found), found);
5921 TREE_TYPE (found) = integer_type_node;
5922 DECL_ARG_TYPE (found) = integer_type_node;
5923 layout_decl (found, 0);
5926 /* If no declaration found, default to int. */
5929 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5931 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5932 DECL_SOURCE_LOCATION (found) = DECL_SOURCE_LOCATION (fndecl);
5934 pedwarn ("%Htype of '%D' defaults to `int'",
5935 &DECL_SOURCE_LOCATION (found), found);
5936 else if (extra_warnings)
5937 warning ("%Htype of '%D' defaults to `int'",
5938 &DECL_SOURCE_LOCATION (found), found);
5942 TREE_PURPOSE (parm) = found;
5944 /* Mark this decl as "already found". */
5945 DECL_WEAK (found) = 1;
5948 /* Put anything which is on the parmdecls chain and which is
5949 not a PARM_DECL onto the list NONPARMS. (The types of
5950 non-parm things which might appear on the list include
5951 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5952 any actual PARM_DECLs not matched with any names. */
5955 for (parm = parmdecls; parm;)
5957 const location_t *locus = &DECL_SOURCE_LOCATION (parm);
5958 tree next = TREE_CHAIN (parm);
5959 TREE_CHAIN (parm) = 0;
5961 if (TREE_CODE (parm) != PARM_DECL)
5962 nonparms = chainon (nonparms, parm);
5965 /* Complain about args with incomplete types. */
5966 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5968 error ("%Hparameter '%D' has incomplete type", locus, parm);
5969 TREE_TYPE (parm) = error_mark_node;
5972 if (! DECL_WEAK (parm))
5974 error ("%Hdeclaration for parameter '%D' but no such "
5975 "parameter", locus, parm);
5976 /* Pretend the parameter was not missing.
5977 This gets us to a standard state and minimizes
5978 further error messages. */
5980 = chainon (specparms,
5981 tree_cons (parm, NULL_TREE, NULL_TREE));
5988 /* Chain the declarations together in the order of the list of
5989 names. Store that chain in the function decl, replacing the
5992 DECL_ARGUMENTS (fndecl) = 0;
5995 for (last = 0; parm; parm = TREE_CHAIN (parm))
5996 if (TREE_PURPOSE (parm))
5999 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6001 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6002 last = TREE_PURPOSE (parm);
6003 TREE_CHAIN (last) = 0;
6007 /* If there was a previous prototype,
6008 set the DECL_ARG_TYPE of each argument according to
6009 the type previously specified, and report any mismatches. */
6011 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6014 for (parm = DECL_ARGUMENTS (fndecl),
6015 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6016 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6017 != void_type_node));
6018 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6020 if (parm == 0 || type == 0
6021 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6023 error ("number of arguments doesn't match prototype");
6024 error ("%Hprototype declaration",
6025 ¤t_function_prototype_locus);
6028 /* Type for passing arg must be consistent with that
6029 declared for the arg. ISO C says we take the unqualified
6030 type for parameters declared with qualified type. */
6031 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6032 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
6035 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6036 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6038 /* Adjust argument to match prototype. E.g. a previous
6039 `int foo(float);' prototype causes
6040 `int foo(x) float x; {...}' to be treated like
6041 `int foo(float x) {...}'. This is particularly
6042 useful for argument types like uid_t. */
6043 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6045 if (PROMOTE_PROTOTYPES
6046 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6047 && TYPE_PRECISION (TREE_TYPE (parm))
6048 < TYPE_PRECISION (integer_type_node))
6049 DECL_ARG_TYPE (parm) = integer_type_node;
6053 pedwarn ("promoted argument `%s' doesn't match prototype",
6054 IDENTIFIER_POINTER (DECL_NAME (parm)));
6055 warning ("%Hprototype declaration",
6056 ¤t_function_prototype_locus);
6061 error ("argument `%s' doesn't match prototype",
6062 IDENTIFIER_POINTER (DECL_NAME (parm)));
6063 error ("%Hprototype declaration",
6064 ¤t_function_prototype_locus);
6068 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6071 /* Otherwise, create a prototype that would match. */
6075 tree actual = 0, last = 0, type;
6077 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6079 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6081 TREE_CHAIN (last) = type;
6086 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6088 TREE_CHAIN (last) = type;
6092 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6093 of the type of this function, but we need to avoid having this
6094 affect the types of other similarly-typed functions, so we must
6095 first force the generation of an identical (but separate) type
6096 node for the relevant function type. The new node we create
6097 will be a variant of the main variant of the original function
6100 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6102 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6105 /* Now store the final chain of decls for the arguments
6106 as the decl-chain of the current lexical scope.
6107 Put the enumerators in as well, at the front so that
6108 DECL_ARGUMENTS is not modified. */
6110 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6113 /* Make sure the scope for the top of the function body
6114 gets a BLOCK if there are any in the function.
6115 Otherwise, the dbx output is wrong. */
6117 keep_next_if_subblocks = 1;
6119 /* Write a record describing this function definition to the prototypes
6120 file (if requested). */
6122 gen_aux_info_record (fndecl, 1, 0, prototype);
6124 /* Initialize the RTL code for the function. */
6125 init_function_start (fndecl);
6127 /* Begin the statement tree for this function. */
6128 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6130 /* If this is a nested function, save away the sizes of any
6131 variable-size types so that we can expand them when generating
6137 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6138 = nreverse (get_pending_sizes ());
6139 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6142 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6145 /* This function is being processed in whole-function mode. */
6146 cfun->x_whole_function_mode_p = 1;
6148 /* Even though we're inside a function body, we still don't want to
6149 call expand_expr to calculate the size of a variable-sized array.
6150 We haven't necessarily assigned RTL to all variables yet, so it's
6151 not safe to try to expand expressions involving them. */
6152 immediate_size_expand = 0;
6153 cfun->x_dont_save_pending_sizes_p = 1;
6155 warn_shadow = saved_warn_shadow;
6158 /* Finish up a function declaration and compile that function
6159 all the way to assembler language output. The free the storage
6160 for the function definition.
6162 This is called after parsing the body of the function definition.
6164 NESTED is nonzero if the function being finished is nested in another.
6165 CAN_DEFER_P is nonzero if the function may be deferred. */
6168 finish_function (int nested, int can_defer_p)
6170 tree fndecl = current_function_decl;
6172 /* When a function declaration is totally empty, e.g.
6174 (the argument list is irrelevant) the compstmt rule will not
6175 bother calling pushlevel/poplevel, which means we get here with
6176 the scope stack out of sync. Detect this situation by
6177 noticing that current_scope is still as
6178 store_parm_decls left it, and do a dummy push/pop to get back to
6179 consistency. Note that the call to pushlevel does not actually
6180 push another scope - see there for details. */
6181 if (current_scope->parm_flag && keep_next_if_subblocks)
6187 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6189 /* Must mark the RESULT_DECL as being in this function. */
6191 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6193 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6195 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6196 != integer_type_node)
6198 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6199 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6201 pedwarn ("%Hreturn type of '%D' is not `int'",
6202 &DECL_SOURCE_LOCATION (fndecl), fndecl);
6206 #ifdef DEFAULT_MAIN_RETURN
6207 /* Make it so that `main' always returns success by default. */
6208 DEFAULT_MAIN_RETURN;
6211 c_expand_return (integer_zero_node);
6216 finish_fname_decls ();
6218 /* Tie off the statement tree for this function. */
6219 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6221 /* Complain if there's just no return statement. */
6222 if (warn_return_type
6223 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6224 && !current_function_returns_value && !current_function_returns_null
6225 /* Don't complain if we abort. */
6226 && !current_function_returns_abnormally
6227 /* Don't warn for main(). */
6228 && !MAIN_NAME_P (DECL_NAME (fndecl))
6229 /* Or if they didn't actually specify a return type. */
6230 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6231 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6232 inline function, as we might never be compiled separately. */
6233 && DECL_INLINE (fndecl))
6234 warning ("no return statement in function returning non-void");
6236 /* Clear out memory we no longer need. */
6237 free_after_parsing (cfun);
6238 /* Since we never call rest_of_compilation, we never clear
6239 CFUN. Do so explicitly. */
6240 free_after_compilation (cfun);
6243 if (flag_unit_at_a_time && can_defer_p)
6245 cgraph_finalize_function (fndecl, DECL_SAVED_TREE (fndecl));
6246 current_function_decl = NULL;
6252 /* Function is parsed.
6253 Generate RTL for the body of this function or defer
6254 it for later expansion. */
6255 int uninlinable = 1;
6257 /* There's no reason to do any of the work here if we're only doing
6258 semantic analysis; this code just generates RTL. */
6259 if (flag_syntax_only)
6261 current_function_decl = NULL;
6262 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6266 if (flag_inline_trees)
6268 /* First, cache whether the current function is inlinable. Some
6269 predicates depend on cfun and current_function_decl to
6270 function completely. */
6271 timevar_push (TV_INTEGRATION);
6272 uninlinable = ! tree_inlinable_function_p (fndecl, 0);
6275 /* We defer functions marked inline *even if* the function
6276 itself is not inlinable. This is because we don't yet
6277 know if the function will actually be used; we may be
6278 able to avoid emitting it entirely. */
6279 && (! uninlinable || DECL_DECLARED_INLINE_P (fndecl))
6280 /* Save function tree for inlining. Should return 0 if the
6281 language does not support function deferring or the
6282 function could not be deferred. */
6283 && defer_fn (fndecl))
6285 /* Let the back-end know that this function exists. */
6286 (*debug_hooks->deferred_inline_function) (fndecl);
6287 timevar_pop (TV_INTEGRATION);
6288 current_function_decl = NULL;
6292 /* Then, inline any functions called in it. */
6293 optimize_inline_calls (fndecl);
6294 timevar_pop (TV_INTEGRATION);
6297 c_expand_body (fndecl);
6299 /* Keep the function body if it's needed for inlining or dumping. */
6300 if (uninlinable && !dump_enabled_p (TDI_all))
6302 /* Allow the body of the function to be garbage collected. */
6303 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6306 /* Let the error reporting routines know that we're outside a
6307 function. For a nested function, this value is used in
6308 c_pop_function_context and then reset via pop_function_context. */
6309 current_function_decl = NULL;
6313 /* Generate the RTL for a deferred function FNDECL. */
6316 c_expand_deferred_function (tree fndecl)
6318 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6319 function was deferred, e.g. in duplicate_decls. */
6320 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6322 if (flag_inline_trees)
6324 timevar_push (TV_INTEGRATION);
6325 optimize_inline_calls (fndecl);
6326 timevar_pop (TV_INTEGRATION);
6328 c_expand_body (fndecl);
6329 current_function_decl = NULL;
6333 /* Called to move the SAVE_EXPRs for parameter declarations in a
6334 nested function into the nested function. DATA is really the
6335 nested FUNCTION_DECL. */
6338 set_save_expr_context (tree *tp,
6342 if (TREE_CODE (*tp) == SAVE_EXPR && !SAVE_EXPR_CONTEXT (*tp))
6343 SAVE_EXPR_CONTEXT (*tp) = (tree) data;
6344 /* Do not walk back into the SAVE_EXPR_CONTEXT; that will cause
6346 else if (DECL_P (*tp))
6352 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6353 then we are already in the process of generating RTL for another
6354 function. If can_defer_p is zero, we won't attempt to defer the
6355 generation of RTL. */
6358 c_expand_body_1 (tree fndecl, int nested_p)
6360 timevar_push (TV_EXPAND);
6364 /* Make sure that we will evaluate variable-sized types involved
6365 in our function's type. */
6366 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6367 /* Squirrel away our current state. */
6368 push_function_context ();
6371 /* Initialize the RTL code for the function. */
6372 current_function_decl = fndecl;
6373 input_location = DECL_SOURCE_LOCATION (fndecl);
6374 init_function_start (fndecl);
6376 /* This function is being processed in whole-function mode. */
6377 cfun->x_whole_function_mode_p = 1;
6379 /* Even though we're inside a function body, we still don't want to
6380 call expand_expr to calculate the size of a variable-sized array.
6381 We haven't necessarily assigned RTL to all variables yet, so it's
6382 not safe to try to expand expressions involving them. */
6383 immediate_size_expand = 0;
6384 cfun->x_dont_save_pending_sizes_p = 1;
6386 /* Set up parameters and prepare for return, for the function. */
6387 expand_function_start (fndecl, 0);
6389 /* If the function has a variably modified type, there may be
6390 SAVE_EXPRs in the parameter types. Their context must be set to
6391 refer to this function; they cannot be expanded in the containing
6393 if (decl_function_context (fndecl)
6394 && variably_modified_type_p (TREE_TYPE (fndecl)))
6395 walk_tree (&TREE_TYPE (fndecl), set_save_expr_context, fndecl,
6398 /* If this function is `main', emit a call to `__main'
6399 to run global initializers, etc. */
6400 if (DECL_NAME (fndecl)
6401 && MAIN_NAME_P (DECL_NAME (fndecl))
6402 && DECL_CONTEXT (fndecl) == NULL_TREE)
6403 expand_main_function ();
6405 /* Generate the RTL for this function. */
6406 expand_stmt (DECL_SAVED_TREE (fndecl));
6408 /* We hard-wired immediate_size_expand to zero above.
6409 expand_function_end will decrement this variable. So, we set the
6410 variable to one here, so that after the decrement it will remain
6412 immediate_size_expand = 1;
6414 /* Allow language dialects to perform special processing. */
6415 if (lang_expand_function_end)
6416 (*lang_expand_function_end) ();
6418 /* Generate rtl for function exit. */
6419 expand_function_end ();
6421 /* If this is a nested function, protect the local variables in the stack
6422 above us from being collected while we're compiling this function. */
6424 ggc_push_context ();
6426 /* Run the optimizers and output the assembler code for this function. */
6427 rest_of_compilation (fndecl);
6429 /* Undo the GC context switch. */
6433 /* With just -Wextra, complain only if function returns both with
6434 and without a value. */
6436 && current_function_returns_value
6437 && current_function_returns_null)
6438 warning ("this function may return with or without a value");
6440 /* If requested, warn about function definitions where the function will
6441 return a value (usually of some struct or union type) which itself will
6442 take up a lot of stack space. */
6444 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6446 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6448 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6449 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6450 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6453 const location_t *locus = &DECL_SOURCE_LOCATION (fndecl);
6454 unsigned int size_as_int
6455 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6457 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6458 warning ("%Hsize of return value of '%D' is %u bytes",
6459 locus, fndecl, size_as_int);
6461 warning ("%Hsize of return value of '%D' is larger than %wd bytes",
6462 locus, fndecl, larger_than_size);
6466 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6467 && ! flag_inline_trees)
6469 /* Stop pointing to the local nodes about to be freed.
6470 But DECL_INITIAL must remain nonzero so we know this
6471 was an actual function definition.
6472 For a nested function, this is done in c_pop_function_context.
6473 If rest_of_compilation set this to 0, leave it 0. */
6474 if (DECL_INITIAL (fndecl) != 0)
6475 DECL_INITIAL (fndecl) = error_mark_node;
6477 DECL_ARGUMENTS (fndecl) = 0;
6480 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6482 if (targetm.have_ctors_dtors)
6483 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6484 DEFAULT_INIT_PRIORITY);
6486 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6489 if (DECL_STATIC_DESTRUCTOR (fndecl))
6491 if (targetm.have_ctors_dtors)
6492 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6493 DEFAULT_INIT_PRIORITY);
6495 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6499 /* Return to the enclosing function. */
6500 pop_function_context ();
6501 timevar_pop (TV_EXPAND);
6504 /* Like c_expand_body_1 but only for unnested functions. */
6507 c_expand_body (tree fndecl)
6509 c_expand_body_1 (fndecl, 0);
6512 /* Check the declarations given in a for-loop for satisfying the C99
6515 check_for_loop_decls (void)
6521 /* If we get here, declarations have been used in a for loop without
6522 the C99 for loop scope. This doesn't make much sense, so don't
6524 error ("`for' loop initial declaration used outside C99 mode");
6527 /* C99 subclause 6.8.5 paragraph 3:
6529 [#3] The declaration part of a for statement shall only
6530 declare identifiers for objects having storage class auto or
6533 It isn't clear whether, in this sentence, "identifiers" binds to
6534 "shall only declare" or to "objects" - that is, whether all identifiers
6535 declared must be identifiers for objects, or whether the restriction
6536 only applies to those that are. (A question on this in comp.std.c
6537 in November 2000 received no answer.) We implement the strictest
6538 interpretation, to avoid creating an extension which later causes
6541 for (t = gettags (); t; t = TREE_CHAIN (t))
6543 if (TREE_PURPOSE (t) != 0)
6545 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6547 if (code == RECORD_TYPE)
6548 error ("`struct %s' declared in `for' loop initial declaration",
6549 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6550 else if (code == UNION_TYPE)
6551 error ("`union %s' declared in `for' loop initial declaration",
6552 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6554 error ("`enum %s' declared in `for' loop initial declaration",
6555 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6559 for (t = getdecls (); t; t = TREE_CHAIN (t))
6561 const location_t *locus = &DECL_SOURCE_LOCATION (t);
6562 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6563 error ("%Hdeclaration of non-variable '%D' in 'for' loop "
6564 "initial declaration", locus, t);
6565 else if (TREE_STATIC (t))
6566 error ("%Hdeclaration of static variable '%D' in 'for' loop "
6567 "initial declaration", locus, t);
6568 else if (DECL_EXTERNAL (t))
6569 error ("%Hdeclaration of 'extern' variable '%D' in 'for' loop "
6570 "initial declaration", locus, t);
6574 /* Save and restore the variables in this file and elsewhere
6575 that keep track of the progress of compilation of the current function.
6576 Used for nested functions. */
6578 struct language_function GTY(())
6580 struct c_language_function base;
6583 int returns_abnormally;
6584 int warn_about_return_type;
6586 struct c_scope *scope;
6589 /* Save and reinitialize the variables
6590 used during compilation of a C function. */
6593 c_push_function_context (struct function *f)
6595 struct language_function *p;
6596 p = ggc_alloc (sizeof (struct language_function));
6599 p->base.x_stmt_tree = c_stmt_tree;
6600 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6601 p->returns_value = current_function_returns_value;
6602 p->returns_null = current_function_returns_null;
6603 p->returns_abnormally = current_function_returns_abnormally;
6604 p->warn_about_return_type = warn_about_return_type;
6605 p->extern_inline = current_extern_inline;
6606 p->scope = current_scope;
6609 /* Restore the variables used during compilation of a C function. */
6612 c_pop_function_context (struct function *f)
6614 struct language_function *p = f->language;
6616 if (DECL_SAVED_INSNS (current_function_decl) == 0
6617 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6619 /* Stop pointing to the local nodes about to be freed. */
6620 /* But DECL_INITIAL must remain nonzero so we know this
6621 was an actual function definition. */
6622 DECL_INITIAL (current_function_decl) = error_mark_node;
6623 DECL_ARGUMENTS (current_function_decl) = 0;
6626 c_stmt_tree = p->base.x_stmt_tree;
6627 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6628 current_function_returns_value = p->returns_value;
6629 current_function_returns_null = p->returns_null;
6630 current_function_returns_abnormally = p->returns_abnormally;
6631 warn_about_return_type = p->warn_about_return_type;
6632 current_extern_inline = p->extern_inline;
6633 current_scope = p->scope;
6638 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6641 c_dup_lang_specific_decl (tree decl)
6643 struct lang_decl *ld;
6645 if (!DECL_LANG_SPECIFIC (decl))
6648 ld = ggc_alloc (sizeof (struct lang_decl));
6649 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6650 DECL_LANG_SPECIFIC (decl) = ld;
6653 /* The functions below are required for functionality of doing
6654 function at once processing in the C front end. Currently these
6655 functions are not called from anywhere in the C front end, but as
6656 these changes continue, that will change. */
6658 /* Returns nonzero if the current statement is a full expression,
6659 i.e. temporaries created during that statement should be destroyed
6660 at the end of the statement. */
6663 stmts_are_full_exprs_p (void)
6668 /* Returns the stmt_tree (if any) to which statements are currently
6669 being added. If there is no active statement-tree, NULL is
6673 current_stmt_tree (void)
6675 return &c_stmt_tree;
6678 /* Returns the stack of SCOPE_STMTs for the current function. */
6681 current_scope_stmt_stack (void)
6683 return &c_scope_stmt_stack;
6686 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6690 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6695 /* Dummy function in place of callback used by C++. */
6698 extract_interface_info (void)
6702 /* Return a new COMPOUND_STMT, after adding it to the current
6706 c_begin_compound_stmt (void)
6710 /* Create the COMPOUND_STMT. */
6711 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6716 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6720 c_expand_decl_stmt (tree t)
6722 tree decl = DECL_STMT_DECL (t);
6724 /* Expand nested functions. */
6725 if (TREE_CODE (decl) == FUNCTION_DECL
6726 && DECL_CONTEXT (decl) == current_function_decl
6727 && DECL_SAVED_TREE (decl))
6728 c_expand_body_1 (decl, 1);
6731 /* Return the global value of T as a symbol. */
6734 identifier_global_value (tree t)
6736 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6737 if (decl == 0 || C_DECL_FILE_SCOPE (decl))
6740 /* Shadowed by something else; find the true global value. */
6741 for (decl = global_scope->names; decl; decl = TREE_CHAIN (decl))
6742 if (DECL_NAME (decl) == t)
6745 /* Only local values for this decl. */
6749 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6750 otherwise the name is found in ridpointers from RID_INDEX. */
6753 record_builtin_type (enum rid rid_index, const char *name, tree type)
6757 id = ridpointers[(int) rid_index];
6759 id = get_identifier (name);
6760 pushdecl (build_decl (TYPE_DECL, id, type));
6763 /* Build the void_list_node (void_type_node having been created). */
6765 build_void_list_node (void)
6767 tree t = build_tree_list (NULL_TREE, void_type_node);
6771 /* Return something to represent absolute declarators containing a *.
6772 TARGET is the absolute declarator that the * contains.
6773 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6774 to apply to the pointer type, represented as identifiers, possible mixed
6777 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6778 if attributes are present) and whose type is the modifier list. */
6781 make_pointer_declarator (tree type_quals_attrs, tree target)
6784 tree itarget = target;
6785 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6786 if (attrs != NULL_TREE)
6787 itarget = tree_cons (attrs, target, NULL_TREE);
6788 return build1 (INDIRECT_REF, quals, itarget);
6791 /* A wrapper around lhd_set_decl_assembler_name that gives static
6792 variables their C names if they are at file scope and only one
6793 translation unit is being compiled, for backwards compatibility
6794 with certain bizzare assembler hacks (like crtstuff.c). */
6797 c_static_assembler_name (tree decl)
6799 if (num_in_fnames == 1
6800 && TREE_STATIC (decl) && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6801 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6802 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6804 lhd_set_decl_assembler_name (decl);
6807 /* Hash and equality functions for link_hash_table: key off
6808 DECL_ASSEMBLER_NAME. */
6811 link_hash_hash (const void *x_p)
6814 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6818 link_hash_eq (const void *x1_p, const void *x2_p)
6820 tree x1 = (tree)x1_p;
6821 tree x2 = (tree)x2_p;
6822 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6825 /* Propagate information between definitions and uses between multiple
6826 translation units in TU_LIST based on linkage rules. */
6829 merge_translation_unit_decls (void)
6831 const tree tu_list = current_file_decl;
6834 htab_t link_hash_table;
6837 /* Create the BLOCK that poplevel would have created, but don't
6838 actually call poplevel since that's expensive. */
6839 block = make_node (BLOCK);
6840 BLOCK_VARS (block) = current_scope->names;
6841 TREE_USED (block) = 1;
6842 DECL_INITIAL (current_file_decl) = block;
6844 /* If only one translation unit seen, no copying necessary. */
6845 if (TREE_CHAIN (tu_list) == NULL_TREE)
6848 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6850 /* Enter any actual definitions into the hash table. */
6851 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6852 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6853 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6856 slot = htab_find_slot (link_hash_table, decl, INSERT);
6858 /* If we've already got a definition, work out which one is
6859 the real one, put it into the hash table, and make the
6860 other one DECL_EXTERNAL. This is important to avoid
6861 putting out two definitions of the same symbol in the
6865 tree old_decl = (tree) *slot;
6867 /* If this is weak or common or whatever, suppress it
6868 in favour of the other definition. */
6869 if (DECL_WEAK (decl))
6870 DECL_EXTERNAL (decl) = 1;
6871 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6872 DECL_EXTERNAL (old_decl) = 1;
6873 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6874 DECL_EXTERNAL (decl) = 1;
6875 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6876 DECL_EXTERNAL (old_decl) = 1;
6878 if (DECL_EXTERNAL (decl))
6880 DECL_INITIAL (decl) = NULL_TREE;
6881 DECL_COMMON (decl) = 0;
6882 DECL_ONE_ONLY (decl) = 0;
6883 DECL_WEAK (decl) = 0;
6885 else if (DECL_EXTERNAL (old_decl))
6887 DECL_INITIAL (old_decl) = NULL_TREE;
6888 DECL_COMMON (old_decl) = 0;
6889 DECL_ONE_ONLY (old_decl) = 0;
6890 DECL_WEAK (old_decl) = 0;
6895 error ("%Hredefinition of global '%D'",
6896 &DECL_SOURCE_LOCATION (decl), decl);
6897 error ("%H'%D' previously defined here",
6898 &DECL_SOURCE_LOCATION (old_decl), old_decl);
6905 /* Now insert the desired information from all the definitions
6906 into any plain declarations. */
6907 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6908 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6909 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6912 global_decl = htab_find (link_hash_table, decl);
6917 /* Print any appropriate error messages, and partially merge
6919 (void) duplicate_decls (decl, global_decl, true, true);
6922 htab_delete (link_hash_table);
6925 /* Perform final processing on file-scope data. */
6928 c_write_global_declarations(void)
6932 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6934 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6935 int len = list_length (globals);
6936 tree *vec = xmalloc (sizeof (tree) * len);
6940 /* Process the decls in reverse order--earliest first.
6941 Put them into VEC from back to front, then take out from front. */
6943 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6944 vec[len - i - 1] = decl;
6946 wrapup_global_declarations (vec, len);
6948 check_global_declarations (vec, len);
6955 /* Reset the parser's state in preparation for a new file. */
6958 c_reset_state (void)
6961 tree file_scope_decl;
6963 /* Pop the global scope. */
6964 if (current_scope != global_scope)
6965 current_scope = global_scope;
6966 file_scope_decl = current_file_decl;
6967 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6968 truly_local_externals = NULL_TREE;
6970 /* Start a new global binding level. */
6972 global_scope = current_scope;
6973 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6974 TREE_CHAIN (current_file_decl) = file_scope_decl;
6976 /* Reintroduce the global declarations. */
6977 for (link = builtin_decls; link; link = TREE_CHAIN (link))
6978 pushdecl (copy_node (link));
6981 #include "gt-c-decl.h"