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 /* In C, comparisons and TRUTH_* expressions have type int. */
2299 truthvalue_type_node = integer_type_node;
2300 truthvalue_true_node = integer_one_node;
2301 truthvalue_false_node = integer_zero_node;
2303 /* Even in C99, which has a real boolean type. */
2304 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2305 boolean_type_node));
2307 endlink = void_list_node;
2308 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2310 = build_function_type (ptr_type_node,
2311 tree_cons (NULL_TREE, ptr_type_node, endlink));
2313 input_location = save_loc;
2315 pedantic_lvalues = pedantic;
2317 make_fname_decl = c_make_fname_decl;
2318 start_fname_decls ();
2320 builtin_decls = global_scope->names;
2323 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2324 decl, NAME is the initialization string and TYPE_DEP indicates whether
2325 NAME depended on the type of the function. As we don't yet implement
2326 delayed emission of static data, we mark the decl as emitted
2327 so it is not placed in the output. Anything using it must therefore pull
2328 out the STRING_CST initializer directly. This does mean that these names
2329 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2332 c_make_fname_decl (tree id, int type_dep)
2334 const char *name = fname_as_string (type_dep);
2335 tree decl, type, init;
2336 size_t length = strlen (name);
2338 type = build_array_type
2339 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2340 build_index_type (size_int (length)));
2342 decl = build_decl (VAR_DECL, id, type);
2344 TREE_STATIC (decl) = 1;
2345 TREE_READONLY (decl) = 1;
2346 DECL_ARTIFICIAL (decl) = 1;
2348 init = build_string (length + 1, name);
2349 TREE_TYPE (init) = type;
2350 DECL_INITIAL (decl) = init;
2352 TREE_USED (decl) = 1;
2354 if (current_function_decl)
2355 pushdecl_function_level (decl, DECL_NAME (decl));
2357 finish_decl (decl, init, NULL_TREE);
2362 /* Return a definition for a builtin function named NAME and whose data type
2363 is TYPE. TYPE should be a function type with argument types.
2364 FUNCTION_CODE tells later passes how to compile calls to this function.
2365 See tree.h for its possible values.
2367 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2368 the name to be called if we can't opencode the function. If
2369 ATTRS is nonzero, use that for the function's attribute list. */
2372 builtin_function (const char *name, tree type, int function_code,
2373 enum built_in_class class, const char *library_name,
2376 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2377 DECL_EXTERNAL (decl) = 1;
2378 TREE_PUBLIC (decl) = 1;
2380 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2381 make_decl_rtl (decl, NULL);
2383 DECL_BUILT_IN_CLASS (decl) = class;
2384 DECL_FUNCTION_CODE (decl) = function_code;
2386 /* Warn if a function in the namespace for users
2387 is used without an occasion to consider it declared. */
2388 if (name[0] != '_' || name[1] != '_')
2389 C_DECL_INVISIBLE (decl) = 1;
2391 /* Possibly apply some default attributes to this built-in function. */
2393 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2395 decl_attributes (&decl, NULL_TREE, 0);
2400 /* Apply default attributes to a function, if a system function with default
2404 c_insert_default_attributes (tree decl)
2406 if (!TREE_PUBLIC (decl))
2408 c_common_insert_default_attributes (decl);
2411 /* Called when a declaration is seen that contains no names to declare.
2412 If its type is a reference to a structure, union or enum inherited
2413 from a containing scope, shadow that tag name for the current scope
2414 with a forward reference.
2415 If its type defines a new named structure or union
2416 or defines an enum, it is valid but we need not do anything here.
2417 Otherwise, it is an error. */
2420 shadow_tag (tree declspecs)
2422 shadow_tag_warned (declspecs, 0);
2426 shadow_tag_warned (tree declspecs, int warned)
2429 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2436 pending_invalid_xref = 0;
2438 /* Remove the attributes from declspecs, since they will confuse the
2440 split_specs_attrs (declspecs, &specs, &attrs);
2442 for (link = specs; link; link = TREE_CHAIN (link))
2444 tree value = TREE_VALUE (link);
2445 enum tree_code code = TREE_CODE (value);
2447 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2448 /* Used to test also that TYPE_SIZE (value) != 0.
2449 That caused warning for `struct foo;' at top level in the file. */
2451 tree name = TYPE_NAME (value);
2458 if (warned != 1 && code != ENUMERAL_TYPE)
2459 /* Empty unnamed enum OK */
2461 pedwarn ("unnamed struct/union that defines no instances");
2467 t = lookup_tag (code, name, 1);
2471 t = make_node (code);
2478 if (!warned && ! in_system_header)
2480 warning ("useless keyword or type name in empty declaration");
2487 error ("two types specified in one empty declaration");
2492 pedwarn ("empty declaration");
2496 /* Construct an array declarator. EXPR is the expression inside [], or
2497 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2498 to the pointer to which a parameter array is converted). STATIC_P is
2499 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2500 is nonzero is the array is [*], a VLA of unspecified length which is
2501 nevertheless a complete type (not currently implemented by GCC),
2502 zero otherwise. The declarator is constructed as an ARRAY_REF
2503 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2504 left of the [] (filled by in set_array_declarator_type) and operand 1
2505 is the expression inside; whose TREE_TYPE is the type qualifiers and
2506 which has TREE_STATIC set if "static" is used. */
2509 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2512 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2513 TREE_TYPE (decl) = quals;
2514 TREE_STATIC (decl) = (static_p ? 1 : 0);
2515 if (pedantic && !flag_isoc99)
2517 if (static_p || quals != NULL_TREE)
2518 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2520 pedwarn ("ISO C90 does not support `[*]' array declarators");
2523 warning ("GCC does not yet properly implement `[*]' array declarators");
2527 /* Set the type of an array declarator. DECL is the declarator, as
2528 constructed by build_array_declarator; TYPE is what appears on the left
2529 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2530 abstract declarator, zero otherwise; this is used to reject static and
2531 type qualifiers in abstract declarators, where they are not in the
2535 set_array_declarator_type (tree decl, tree type, int abstract_p)
2537 TREE_OPERAND (decl, 0) = type;
2538 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2539 error ("static or type qualifiers in abstract declarator");
2543 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2546 groktypename (tree typename)
2550 if (TREE_CODE (typename) != TREE_LIST)
2553 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2555 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
2557 /* Apply attributes. */
2558 decl_attributes (&typename, attrs, 0);
2563 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2566 groktypename_in_parm_context (tree typename)
2568 if (TREE_CODE (typename) != TREE_LIST)
2570 return grokdeclarator (TREE_VALUE (typename),
2571 TREE_PURPOSE (typename),
2575 /* Decode a declarator in an ordinary declaration or data definition.
2576 This is called as soon as the type information and variable name
2577 have been parsed, before parsing the initializer if any.
2578 Here we create the ..._DECL node, fill in its type,
2579 and put it on the list of decls for the current context.
2580 The ..._DECL node is returned as the value.
2582 Exception: for arrays where the length is not specified,
2583 the type is left null, to be filled in by `finish_decl'.
2585 Function definitions do not come here; they go to start_function
2586 instead. However, external and forward declarations of functions
2587 do go through here. Structure field declarations are done by
2588 grokfield and not through here. */
2591 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2596 /* An object declared as __attribute__((deprecated)) suppresses
2597 warnings of uses of other deprecated items. */
2598 if (lookup_attribute ("deprecated", attributes))
2599 deprecated_state = DEPRECATED_SUPPRESS;
2601 decl = grokdeclarator (declarator, declspecs,
2602 NORMAL, initialized);
2604 deprecated_state = DEPRECATED_NORMAL;
2606 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2607 && MAIN_NAME_P (DECL_NAME (decl)))
2608 warning ("%H'%D' is usually a function",
2609 &DECL_SOURCE_LOCATION (decl), decl);
2612 /* Is it valid for this decl to have an initializer at all?
2613 If not, set INITIALIZED to zero, which will indirectly
2614 tell `finish_decl' to ignore the initializer once it is parsed. */
2615 switch (TREE_CODE (decl))
2618 error ("typedef `%s' is initialized (use __typeof__ instead)",
2619 IDENTIFIER_POINTER (DECL_NAME (decl)));
2624 error ("function `%s' is initialized like a variable",
2625 IDENTIFIER_POINTER (DECL_NAME (decl)));
2630 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2631 error ("parameter `%s' is initialized",
2632 IDENTIFIER_POINTER (DECL_NAME (decl)));
2637 /* Don't allow initializations for incomplete types
2638 except for arrays which might be completed by the initialization. */
2640 /* This can happen if the array size is an undefined macro. We already
2641 gave a warning, so we don't need another one. */
2642 if (TREE_TYPE (decl) == error_mark_node)
2644 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2646 /* A complete type is ok if size is fixed. */
2648 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2649 || C_DECL_VARIABLE_SIZE (decl))
2651 error ("variable-sized object may not be initialized");
2655 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2657 error ("variable `%s' has initializer but incomplete type",
2658 IDENTIFIER_POINTER (DECL_NAME (decl)));
2661 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2663 error ("elements of array `%s' have incomplete type",
2664 IDENTIFIER_POINTER (DECL_NAME (decl)));
2671 DECL_EXTERNAL (decl) = 0;
2672 if (current_scope == global_scope)
2673 TREE_STATIC (decl) = 1;
2675 /* Tell `pushdecl' this is an initialized decl
2676 even though we don't yet have the initializer expression.
2677 Also tell `finish_decl' it may store the real initializer. */
2678 DECL_INITIAL (decl) = error_mark_node;
2681 /* If this is a function declaration, write a record describing it to the
2682 prototypes file (if requested). */
2684 if (TREE_CODE (decl) == FUNCTION_DECL)
2685 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2687 /* ANSI specifies that a tentative definition which is not merged with
2688 a non-tentative definition behaves exactly like a definition with an
2689 initializer equal to zero. (Section 3.7.2)
2691 -fno-common gives strict ANSI behavior, though this tends to break
2692 a large body of code that grew up without this rule.
2694 Thread-local variables are never common, since there's no entrenched
2695 body of code to break, and it allows more efficient variable references
2696 in the presence of dynamic linking. */
2698 if (TREE_CODE (decl) == VAR_DECL
2700 && TREE_PUBLIC (decl)
2701 && !DECL_THREAD_LOCAL (decl)
2703 DECL_COMMON (decl) = 1;
2705 /* Set attributes here so if duplicate decl, will have proper attributes. */
2706 decl_attributes (&decl, attributes, 0);
2708 if (TREE_CODE (decl) == FUNCTION_DECL
2709 && DECL_DECLARED_INLINE_P (decl)
2710 && DECL_UNINLINABLE (decl)
2711 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2712 warning ("%Hinline function '%D' given attribute noinline",
2713 &DECL_SOURCE_LOCATION (decl), decl);
2715 /* Add this decl to the current scope.
2716 TEM may equal DECL or it may be a previous decl of the same name. */
2717 tem = pushdecl (decl);
2719 /* For a local variable, define the RTL now. */
2720 if (current_scope != global_scope
2721 /* But not if this is a duplicate decl
2722 and we preserved the rtl from the previous one
2723 (which may or may not happen). */
2724 && !DECL_RTL_SET_P (tem)
2725 && C_DECL_FILE_SCOPE (tem))
2727 if (TREE_TYPE (tem) != error_mark_node
2728 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
2730 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2731 && DECL_INITIAL (tem) != 0)
2738 /* Finish processing of a declaration;
2739 install its initial value.
2740 If the length of an array type is not known before,
2741 it must be determined now, from the initial value, or it is an error. */
2744 finish_decl (tree decl, tree init, tree asmspec_tree)
2746 tree type = TREE_TYPE (decl);
2747 int was_incomplete = (DECL_SIZE (decl) == 0);
2748 const char *asmspec = 0;
2750 /* If a name was specified, get the string. */
2751 if (current_scope == global_scope)
2752 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2754 asmspec = TREE_STRING_POINTER (asmspec_tree);
2756 /* If `start_decl' didn't like having an initialization, ignore it now. */
2757 if (init != 0 && DECL_INITIAL (decl) == 0)
2760 /* Don't crash if parm is initialized. */
2761 if (TREE_CODE (decl) == PARM_DECL)
2765 store_init_value (decl, init);
2767 /* Deduce size of array from initialization, if not already known */
2768 if (TREE_CODE (type) == ARRAY_TYPE
2769 && TYPE_DOMAIN (type) == 0
2770 && TREE_CODE (decl) != TYPE_DECL)
2773 = (TREE_STATIC (decl)
2774 /* Even if pedantic, an external linkage array
2775 may have incomplete type at first. */
2776 ? pedantic && !TREE_PUBLIC (decl)
2777 : !DECL_EXTERNAL (decl));
2779 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2781 /* Get the completed type made by complete_array_type. */
2782 type = TREE_TYPE (decl);
2785 error ("%Hinitializer fails to determine size of '%D'",
2786 &DECL_SOURCE_LOCATION (decl), decl);
2788 else if (failure == 2)
2791 error ("%Harray size missing in '%D'",
2792 &DECL_SOURCE_LOCATION (decl), decl);
2793 /* If a `static' var's size isn't known,
2794 make it extern as well as static, so it does not get
2796 If it is not `static', then do not mark extern;
2797 finish_incomplete_decl will give it a default size
2798 and it will get allocated. */
2799 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2800 DECL_EXTERNAL (decl) = 1;
2803 /* TYPE_MAX_VALUE is always one less than the number of elements
2804 in the array, because we start counting at zero. Therefore,
2805 warn only if the value is less than zero. */
2806 else if (pedantic && TYPE_DOMAIN (type) != 0
2807 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2808 error ("%Hzero or negative size array '%D'",
2809 &DECL_SOURCE_LOCATION (decl), decl);
2811 layout_decl (decl, 0);
2814 if (TREE_CODE (decl) == VAR_DECL)
2816 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2817 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2818 layout_decl (decl, 0);
2820 if (DECL_SIZE (decl) == 0
2821 /* Don't give an error if we already gave one earlier. */
2822 && TREE_TYPE (decl) != error_mark_node
2823 && (TREE_STATIC (decl)
2825 /* A static variable with an incomplete type
2826 is an error if it is initialized.
2827 Also if it is not file scope.
2828 Otherwise, let it through, but if it is not `extern'
2829 then it may cause an error message later. */
2830 (DECL_INITIAL (decl) != 0
2831 || !C_DECL_FILE_SCOPE (decl))
2833 /* An automatic variable with an incomplete type
2835 !DECL_EXTERNAL (decl)))
2837 error ("%Hstorage size of '%D' isn't known",
2838 &DECL_SOURCE_LOCATION (decl), decl);
2839 TREE_TYPE (decl) = error_mark_node;
2842 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2843 && DECL_SIZE (decl) != 0)
2845 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2846 constant_expression_warning (DECL_SIZE (decl));
2848 error ("%Hstorage size of '%D' isn't constant",
2849 &DECL_SOURCE_LOCATION (decl), decl);
2852 if (TREE_USED (type))
2853 TREE_USED (decl) = 1;
2856 /* If this is a function and an assembler name is specified, reset DECL_RTL
2857 so we can give it its new name. Also, update built_in_decls if it
2858 was a normal built-in. */
2859 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2861 /* ASMSPEC is given, and not the name of a register. Mark the
2862 name with a star so assemble_name won't munge it. */
2863 char *starred = alloca (strlen (asmspec) + 2);
2865 strcpy (starred + 1, asmspec);
2867 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2869 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2870 SET_DECL_RTL (builtin, NULL_RTX);
2871 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2872 #ifdef TARGET_MEM_FUNCTIONS
2873 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2874 init_block_move_fn (starred);
2875 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2876 init_block_clear_fn (starred);
2878 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2879 init_block_move_fn (starred);
2880 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2881 init_block_clear_fn (starred);
2884 SET_DECL_RTL (decl, NULL_RTX);
2885 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (starred));
2888 /* If #pragma weak was used, mark the decl weak now. */
2889 if (current_scope == global_scope)
2890 maybe_apply_pragma_weak (decl);
2892 /* Output the assembler code and/or RTL code for variables and functions,
2893 unless the type is an undefined structure or union.
2894 If not, it will get done when the type is completed. */
2896 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2898 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2899 if (c_dialect_objc ())
2900 objc_check_decl (decl);
2902 if (C_DECL_FILE_SCOPE (decl))
2904 if (DECL_INITIAL (decl) == NULL_TREE
2905 || DECL_INITIAL (decl) == error_mark_node)
2906 /* Don't output anything
2907 when a tentative file-scope definition is seen.
2908 But at end of compilation, do output code for them. */
2909 DECL_DEFER_OUTPUT (decl) = 1;
2910 rest_of_decl_compilation (decl, asmspec, true, 0);
2914 /* This is a local variable. If there is an ASMSPEC, the
2915 user has requested that we handle it specially. */
2918 /* In conjunction with an ASMSPEC, the `register'
2919 keyword indicates that we should place the variable
2920 in a particular register. */
2921 if (DECL_REGISTER (decl))
2922 DECL_C_HARD_REGISTER (decl) = 1;
2924 /* If this is not a static variable, issue a warning.
2925 It doesn't make any sense to give an ASMSPEC for an
2926 ordinary, non-register local variable. Historically,
2927 GCC has accepted -- but ignored -- the ASMSPEC in
2929 if (TREE_CODE (decl) == VAR_DECL
2930 && !DECL_REGISTER (decl)
2931 && !TREE_STATIC (decl))
2932 warning ("%Hignoring asm-specifier for non-static local "
2933 "variable '%D'", &DECL_SOURCE_LOCATION (decl), decl);
2935 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
2938 if (TREE_CODE (decl) != FUNCTION_DECL)
2939 add_decl_stmt (decl);
2942 if (!C_DECL_FILE_SCOPE (decl))
2944 /* Recompute the RTL of a local array now
2945 if it used to be an incomplete type. */
2947 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2949 /* If we used it already as memory, it must stay in memory. */
2950 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2951 /* If it's still incomplete now, no init will save it. */
2952 if (DECL_SIZE (decl) == 0)
2953 DECL_INITIAL (decl) = 0;
2958 /* If this was marked 'used', be sure it will be output. */
2959 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2960 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2962 if (TREE_CODE (decl) == TYPE_DECL)
2964 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2965 if (c_dialect_objc ())
2966 objc_check_decl (decl);
2967 rest_of_decl_compilation (decl, NULL, C_DECL_FILE_SCOPE (decl), 0);
2970 /* At the end of a declaration, throw away any variable type sizes
2971 of types defined inside that declaration. There is no use
2972 computing them in the following function definition. */
2973 if (current_scope == global_scope)
2974 get_pending_sizes ();
2976 /* Install a cleanup (aka destructor) if one was given. */
2977 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2979 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2982 static bool eh_initialized_p;
2984 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2985 tree cleanup_decl = lookup_name (cleanup_id);
2988 /* Build "cleanup(&decl)" for the destructor. */
2989 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2990 cleanup = build_tree_list (NULL_TREE, cleanup);
2991 cleanup = build_function_call (cleanup_decl, cleanup);
2993 /* Don't warn about decl unused; the cleanup uses it. */
2994 TREE_USED (decl) = 1;
2996 /* Initialize EH, if we've been told to do so. */
2997 if (flag_exceptions && !eh_initialized_p)
2999 eh_initialized_p = true;
3000 eh_personality_libfunc
3001 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3002 ? "__gcc_personality_sj0"
3003 : "__gcc_personality_v0");
3004 using_eh_for_cleanups ();
3007 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
3012 /* Given a parsed parameter declaration,
3013 decode it into a PARM_DECL and push that on the current scope.
3014 Also, for the sake of forward parm decls,
3015 record the given order of parms in `parm_order'. */
3018 push_parm_decl (tree parm)
3021 int old_immediate_size_expand = immediate_size_expand;
3022 /* Don't try computing parm sizes now -- wait till fn is called. */
3023 immediate_size_expand = 0;
3025 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3026 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3027 decl_attributes (&decl, TREE_VALUE (parm), 0);
3029 decl = pushdecl (decl);
3031 immediate_size_expand = old_immediate_size_expand;
3033 current_scope->parm_order
3034 = tree_cons (NULL_TREE, decl, current_scope->parm_order);
3036 /* Add this decl to the current scope. */
3037 finish_decl (decl, NULL_TREE, NULL_TREE);
3040 /* Clear the given order of parms in `parm_order'.
3041 Used at start of parm list,
3042 and also at semicolon terminating forward decls. */
3045 clear_parm_order (void)
3047 current_scope->parm_order = NULL_TREE;
3050 static GTY(()) int compound_literal_number;
3052 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3053 literal, which may be an incomplete array type completed by the
3054 initializer; INIT is a CONSTRUCTOR that initializes the compound
3058 build_compound_literal (tree type, tree init)
3060 /* We do not use start_decl here because we have a type, not a declarator;
3061 and do not use finish_decl because the decl should be stored inside
3062 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3063 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3066 DECL_EXTERNAL (decl) = 0;
3067 TREE_PUBLIC (decl) = 0;
3068 TREE_STATIC (decl) = (current_scope == global_scope);
3069 DECL_CONTEXT (decl) = current_function_decl;
3070 TREE_USED (decl) = 1;
3071 TREE_TYPE (decl) = type;
3072 TREE_READONLY (decl) = TREE_READONLY (type);
3073 store_init_value (decl, init);
3075 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3077 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3082 type = TREE_TYPE (decl);
3083 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3084 return error_mark_node;
3086 stmt = build_stmt (DECL_STMT, decl);
3087 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3088 TREE_SIDE_EFFECTS (complit) = 1;
3090 layout_decl (decl, 0);
3092 if (TREE_STATIC (decl))
3094 /* This decl needs a name for the assembler output. We also need
3095 a unique suffix to be added to the name. */
3098 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3099 compound_literal_number);
3100 compound_literal_number++;
3101 DECL_NAME (decl) = get_identifier (name);
3102 DECL_DEFER_OUTPUT (decl) = 1;
3103 DECL_COMDAT (decl) = 1;
3104 DECL_ARTIFICIAL (decl) = 1;
3106 rest_of_decl_compilation (decl, NULL, 1, 0);
3112 /* Make TYPE a complete type based on INITIAL_VALUE.
3113 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3114 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3117 complete_array_type (tree type, tree initial_value, int do_default)
3119 tree maxindex = NULL_TREE;
3124 /* Note MAXINDEX is really the maximum index,
3125 one less than the size. */
3126 if (TREE_CODE (initial_value) == STRING_CST)
3129 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3130 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3133 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3135 tree elts = CONSTRUCTOR_ELTS (initial_value);
3136 maxindex = build_int_2 (-1, -1);
3137 for (; elts; elts = TREE_CHAIN (elts))
3139 if (TREE_PURPOSE (elts))
3140 maxindex = TREE_PURPOSE (elts);
3142 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3143 maxindex, integer_one_node));
3145 maxindex = copy_node (maxindex);
3149 /* Make an error message unless that happened already. */
3150 if (initial_value != error_mark_node)
3153 /* Prevent further error messages. */
3154 maxindex = build_int_2 (0, 0);
3161 maxindex = build_int_2 (0, 0);
3167 TYPE_DOMAIN (type) = build_index_type (maxindex);
3168 if (!TREE_TYPE (maxindex))
3169 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3172 /* Lay out the type now that we can get the real answer. */
3179 /* Determine whether TYPE is a structure with a flexible array member,
3180 or a union containing such a structure (possibly recursively). */
3183 flexible_array_type_p (tree type)
3186 switch (TREE_CODE (type))
3189 x = TYPE_FIELDS (type);
3192 while (TREE_CHAIN (x) != NULL_TREE)
3194 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3195 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3196 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3197 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3201 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3203 if (flexible_array_type_p (TREE_TYPE (x)))
3212 /* Given declspecs and a declarator,
3213 determine the name and type of the object declared
3214 and construct a ..._DECL node for it.
3215 (In one case we can return a ..._TYPE node instead.
3216 For invalid input we sometimes return 0.)
3218 DECLSPECS is a chain of tree_list nodes whose value fields
3219 are the storage classes and type specifiers.
3221 DECL_CONTEXT says which syntactic context this declaration is in:
3222 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3223 FUNCDEF for a function definition. Like NORMAL but a few different
3224 error messages in each case. Return value may be zero meaning
3225 this definition is too screwy to try to parse.
3226 PARM for a parameter declaration (either within a function prototype
3227 or before a function body). Make a PARM_DECL, or return void_type_node.
3228 TYPENAME if for a typename (in a cast or sizeof).
3229 Don't make a DECL node; just return the ..._TYPE node.
3230 FIELD for a struct or union field; make a FIELD_DECL.
3231 BITFIELD for a field with specified width.
3232 INITIALIZED is 1 if the decl has an initializer.
3234 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3235 It may also be so in the PARM case, for a prototype where the
3236 argument type is specified but not the name.
3238 This function is where the complicated C meanings of `static'
3239 and `extern' are interpreted. */
3242 grokdeclarator (tree declarator, tree declspecs,
3243 enum decl_context decl_context, int initialized)
3247 tree type = NULL_TREE;
3252 int type_quals = TYPE_UNQUALIFIED;
3254 int explicit_int = 0;
3255 int explicit_char = 0;
3256 int defaulted_int = 0;
3257 tree typedef_decl = 0;
3259 tree typedef_type = 0;
3260 int funcdef_flag = 0;
3261 enum tree_code innermost_code = ERROR_MARK;
3263 int size_varies = 0;
3264 tree decl_attr = NULL_TREE;
3265 tree array_ptr_quals = NULL_TREE;
3266 int array_parm_static = 0;
3267 tree returned_attrs = NULL_TREE;
3269 if (decl_context == BITFIELD)
3270 bitfield = 1, decl_context = FIELD;
3272 if (decl_context == FUNCDEF)
3273 funcdef_flag = 1, decl_context = NORMAL;
3275 /* Look inside a declarator for the name being declared
3276 and get it as a string, for an error message. */
3278 tree decl = declarator;
3282 switch (TREE_CODE (decl))
3287 innermost_code = TREE_CODE (decl);
3288 decl = TREE_OPERAND (decl, 0);
3292 decl = TREE_VALUE (decl);
3295 case IDENTIFIER_NODE:
3296 name = IDENTIFIER_POINTER (decl);
3307 /* A function definition's declarator must have the form of
3308 a function declarator. */
3310 if (funcdef_flag && innermost_code != CALL_EXPR)
3313 /* If this looks like a function definition, make it one,
3314 even if it occurs where parms are expected.
3315 Then store_parm_decls will reject it and not use it as a parm. */
3316 if (decl_context == NORMAL && !funcdef_flag
3317 && current_scope->parm_flag)
3318 decl_context = PARM;
3320 /* Look through the decl specs and record which ones appear.
3321 Some typespecs are defined as built-in typenames.
3322 Others, the ones that are modifiers of other types,
3323 are represented by bits in SPECBITS: set the bits for
3324 the modifiers that appear. Storage class keywords are also in SPECBITS.
3326 If there is a typedef name or a type, store the type in TYPE.
3327 This includes builtin typedefs such as `int'.
3329 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3330 and did not come from a user typedef.
3332 Set LONGLONG if `long' is mentioned twice. */
3334 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3336 tree id = TREE_VALUE (spec);
3338 /* If the entire declaration is itself tagged as deprecated then
3339 suppress reports of deprecated items. */
3340 if (id && TREE_DEPRECATED (id))
3342 if (deprecated_state != DEPRECATED_SUPPRESS)
3343 warn_deprecated_use (id);
3346 if (id == ridpointers[(int) RID_INT])
3348 if (id == ridpointers[(int) RID_CHAR])
3351 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3353 enum rid i = C_RID_CODE (id);
3354 if ((int) i <= (int) RID_LAST_MODIFIER)
3356 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3359 error ("`long long long' is too long for GCC");
3362 if (pedantic && !flag_isoc99 && ! in_system_header
3364 pedwarn ("ISO C90 does not support `long long'");
3368 else if (specbits & (1 << (int) i))
3370 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3373 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3376 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3379 /* Diagnose "__thread extern". Recall that this list
3380 is in the reverse order seen in the text. */
3382 && (specbits & (1 << (int) RID_EXTERN
3383 | 1 << (int) RID_STATIC)))
3385 if (specbits & 1 << (int) RID_EXTERN)
3386 error ("`__thread' before `extern'");
3388 error ("`__thread' before `static'");
3391 specbits |= 1 << (int) i;
3396 error ("two or more data types in declaration of `%s'", name);
3397 /* Actual typedefs come to us as TYPE_DECL nodes. */
3398 else if (TREE_CODE (id) == TYPE_DECL)
3400 if (TREE_TYPE (id) == error_mark_node)
3401 ; /* Allow the type to default to int to avoid cascading errors. */
3404 type = TREE_TYPE (id);
3405 decl_attr = DECL_ATTRIBUTES (id);
3409 /* Built-in types come as identifiers. */
3410 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3412 tree t = lookup_name (id);
3413 if (TREE_TYPE (t) == error_mark_node)
3415 else if (!t || TREE_CODE (t) != TYPE_DECL)
3416 error ("`%s' fails to be a typedef or built in type",
3417 IDENTIFIER_POINTER (id));
3420 type = TREE_TYPE (t);
3424 else if (TREE_CODE (id) != ERROR_MARK)
3431 typedef_type = type;
3433 size_varies = C_TYPE_VARIABLE_SIZE (type);
3435 /* No type at all: default to `int', and set DEFAULTED_INT
3436 because it was not a user-defined typedef. */
3440 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3441 | (1 << (int) RID_SIGNED)
3442 | (1 << (int) RID_UNSIGNED)
3443 | (1 << (int) RID_COMPLEX))))
3444 /* Don't warn about typedef foo = bar. */
3445 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3446 && ! in_system_header)
3448 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3449 and this is a function, or if -Wimplicit; prefer the former
3450 warning since it is more explicit. */
3451 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3453 warn_about_return_type = 1;
3454 else if (warn_implicit_int || flag_isoc99)
3455 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3460 type = integer_type_node;
3463 /* Now process the modifiers that were specified
3464 and check for invalid combinations. */
3466 /* Long double is a special combination. */
3468 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3469 && TYPE_MAIN_VARIANT (type) == double_type_node)
3471 specbits &= ~(1 << (int) RID_LONG);
3472 type = long_double_type_node;
3475 /* Check all other uses of type modifiers. */
3477 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3478 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3482 if ((specbits & 1 << (int) RID_LONG)
3483 && (specbits & 1 << (int) RID_SHORT))
3484 error ("both long and short specified for `%s'", name);
3485 else if (((specbits & 1 << (int) RID_LONG)
3486 || (specbits & 1 << (int) RID_SHORT))
3488 error ("long or short specified with char for `%s'", name);
3489 else if (((specbits & 1 << (int) RID_LONG)
3490 || (specbits & 1 << (int) RID_SHORT))
3491 && TREE_CODE (type) == REAL_TYPE)
3493 static int already = 0;
3495 error ("long or short specified with floating type for `%s'", name);
3496 if (! already && ! pedantic)
3498 error ("the only valid combination is `long double'");
3502 else if ((specbits & 1 << (int) RID_SIGNED)
3503 && (specbits & 1 << (int) RID_UNSIGNED))
3504 error ("both signed and unsigned specified for `%s'", name);
3505 else if (TREE_CODE (type) != INTEGER_TYPE)
3506 error ("long, short, signed or unsigned invalid for `%s'", name);
3510 if (!explicit_int && !defaulted_int && !explicit_char)
3512 error ("long, short, signed or unsigned used invalidly for `%s'",
3518 /* Discard the type modifiers if they are invalid. */
3521 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3522 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3527 if ((specbits & (1 << (int) RID_COMPLEX))
3528 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3530 error ("complex invalid for `%s'", name);
3531 specbits &= ~(1 << (int) RID_COMPLEX);
3534 /* Decide whether an integer type is signed or not.
3535 Optionally treat bitfields as signed by default. */
3536 if (specbits & 1 << (int) RID_UNSIGNED
3537 || (bitfield && ! flag_signed_bitfields
3538 && (explicit_int || defaulted_int || explicit_char
3539 /* A typedef for plain `int' without `signed'
3540 can be controlled just like plain `int'. */
3541 || ! (typedef_decl != 0
3542 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3543 && TREE_CODE (type) != ENUMERAL_TYPE
3544 && !(specbits & 1 << (int) RID_SIGNED)))
3547 type = long_long_unsigned_type_node;
3548 else if (specbits & 1 << (int) RID_LONG)
3549 type = long_unsigned_type_node;
3550 else if (specbits & 1 << (int) RID_SHORT)
3551 type = short_unsigned_type_node;
3552 else if (type == char_type_node)
3553 type = unsigned_char_type_node;
3554 else if (typedef_decl)
3555 type = c_common_unsigned_type (type);
3557 type = unsigned_type_node;
3559 else if ((specbits & 1 << (int) RID_SIGNED)
3560 && type == char_type_node)
3561 type = signed_char_type_node;
3563 type = long_long_integer_type_node;
3564 else if (specbits & 1 << (int) RID_LONG)
3565 type = long_integer_type_node;
3566 else if (specbits & 1 << (int) RID_SHORT)
3567 type = short_integer_type_node;
3569 if (specbits & 1 << (int) RID_COMPLEX)
3571 if (pedantic && !flag_isoc99)
3572 pedwarn ("ISO C90 does not support complex types");
3573 /* If we just have "complex", it is equivalent to
3574 "complex double", but if any modifiers at all are specified it is
3575 the complex form of TYPE. E.g, "complex short" is
3576 "complex short int". */
3578 if (defaulted_int && ! longlong
3579 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3580 | (1 << (int) RID_SIGNED)
3581 | (1 << (int) RID_UNSIGNED))))
3584 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3585 type = complex_double_type_node;
3587 else if (type == integer_type_node)
3590 pedwarn ("ISO C does not support complex integer types");
3591 type = complex_integer_type_node;
3593 else if (type == float_type_node)
3594 type = complex_float_type_node;
3595 else if (type == double_type_node)
3596 type = complex_double_type_node;
3597 else if (type == long_double_type_node)
3598 type = complex_long_double_type_node;
3602 pedwarn ("ISO C does not support complex integer types");
3603 type = build_complex_type (type);
3607 /* Figure out the type qualifiers for the declaration. There are
3608 two ways a declaration can become qualified. One is something
3609 like `const int i' where the `const' is explicit. Another is
3610 something like `typedef const int CI; CI i' where the type of the
3611 declaration contains the `const'. */
3612 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3613 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
3614 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3615 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3616 if (constp > 1 && ! flag_isoc99)
3617 pedwarn ("duplicate `const'");
3618 if (restrictp > 1 && ! flag_isoc99)
3619 pedwarn ("duplicate `restrict'");
3620 if (volatilep > 1 && ! flag_isoc99)
3621 pedwarn ("duplicate `volatile'");
3622 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3623 type = TYPE_MAIN_VARIANT (type);
3624 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3625 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3626 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3628 /* Warn if two storage classes are given. Default to `auto'. */
3633 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3634 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3635 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3636 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3637 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3639 /* "static __thread" and "extern __thread" are allowed. */
3640 if ((specbits & (1 << (int) RID_THREAD
3641 | 1 << (int) RID_STATIC
3642 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3645 /* Warn about storage classes that are invalid for certain
3646 kinds of declarations (parameters, typenames, etc.). */
3649 error ("multiple storage classes in declaration of `%s'", name);
3650 else if (funcdef_flag
3652 & ((1 << (int) RID_REGISTER)
3653 | (1 << (int) RID_AUTO)
3654 | (1 << (int) RID_TYPEDEF)
3655 | (1 << (int) RID_THREAD))))
3657 if (specbits & 1 << (int) RID_AUTO
3658 && (pedantic || current_scope == global_scope))
3659 pedwarn ("function definition declared `auto'");
3660 if (specbits & 1 << (int) RID_REGISTER)
3661 error ("function definition declared `register'");
3662 if (specbits & 1 << (int) RID_TYPEDEF)
3663 error ("function definition declared `typedef'");
3664 if (specbits & 1 << (int) RID_THREAD)
3665 error ("function definition declared `__thread'");
3666 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3667 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3669 else if (decl_context != NORMAL && nclasses > 0)
3671 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3675 switch (decl_context)
3678 error ("storage class specified for structure field `%s'",
3682 error ("storage class specified for parameter `%s'", name);
3685 error ("storage class specified for typename");
3688 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3689 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3690 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3693 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3695 /* `extern' with initialization is invalid if not at file scope. */
3696 if (current_scope == global_scope)
3697 warning ("`%s' initialized and declared `extern'", name);
3699 error ("`%s' has both `extern' and initializer", name);
3701 else if (current_scope == global_scope)
3703 if (specbits & 1 << (int) RID_AUTO)
3704 error ("file-scope declaration of `%s' specifies `auto'", name);
3708 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3709 error ("nested function `%s' declared `extern'", name);
3710 else if ((specbits & (1 << (int) RID_THREAD
3711 | 1 << (int) RID_EXTERN
3712 | 1 << (int) RID_STATIC))
3713 == (1 << (int) RID_THREAD))
3715 error ("function-scope `%s' implicitly auto and declared `__thread'",
3717 specbits &= ~(1 << (int) RID_THREAD);
3722 /* Now figure out the structure of the declarator proper.
3723 Descend through it, creating more complex types, until we reach
3724 the declared identifier (or NULL_TREE, in an absolute declarator). */
3726 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3728 if (type == error_mark_node)
3730 declarator = TREE_OPERAND (declarator, 0);
3734 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3735 an INDIRECT_REF (for *...),
3736 a CALL_EXPR (for ...(...)),
3737 a TREE_LIST (for nested attributes),
3738 an identifier (for the name being declared)
3739 or a null pointer (for the place in an absolute declarator
3740 where the name was omitted).
3741 For the last two cases, we have just exited the loop.
3743 At this point, TYPE is the type of elements of an array,
3744 or for a function to return, or for a pointer to point to.
3745 After this sequence of ifs, TYPE is the type of the
3746 array or function or pointer, and DECLARATOR has had its
3747 outermost layer removed. */
3749 if (array_ptr_quals != NULL_TREE || array_parm_static)
3751 /* Only the innermost declarator (making a parameter be of
3752 array type which is converted to pointer type)
3753 may have static or type qualifiers. */
3754 error ("static or type qualifiers in non-parameter array declarator");
3755 array_ptr_quals = NULL_TREE;
3756 array_parm_static = 0;
3759 if (TREE_CODE (declarator) == TREE_LIST)
3761 /* We encode a declarator with embedded attributes using
3763 tree attrs = TREE_PURPOSE (declarator);
3766 declarator = TREE_VALUE (declarator);
3767 inner_decl = declarator;
3768 while (inner_decl != NULL_TREE
3769 && TREE_CODE (inner_decl) == TREE_LIST)
3770 inner_decl = TREE_VALUE (inner_decl);
3771 if (inner_decl == NULL_TREE
3772 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3773 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3774 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3775 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3776 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3777 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3778 returned_attrs = decl_attributes (&type,
3779 chainon (returned_attrs, attrs),
3782 else if (TREE_CODE (declarator) == ARRAY_REF)
3784 tree itype = NULL_TREE;
3785 tree size = TREE_OPERAND (declarator, 1);
3786 /* The index is a signed object `sizetype' bits wide. */
3787 tree index_type = c_common_signed_type (sizetype);
3789 array_ptr_quals = TREE_TYPE (declarator);
3790 array_parm_static = TREE_STATIC (declarator);
3792 declarator = TREE_OPERAND (declarator, 0);
3794 /* Check for some types that there cannot be arrays of. */
3796 if (VOID_TYPE_P (type))
3798 error ("declaration of `%s' as array of voids", name);
3799 type = error_mark_node;
3802 if (TREE_CODE (type) == FUNCTION_TYPE)
3804 error ("declaration of `%s' as array of functions", name);
3805 type = error_mark_node;
3808 if (pedantic && flexible_array_type_p (type))
3809 pedwarn ("invalid use of structure with flexible array member");
3811 if (size == error_mark_node)
3812 type = error_mark_node;
3814 if (type == error_mark_node)
3817 /* If size was specified, set ITYPE to a range-type for that size.
3818 Otherwise, ITYPE remains null. finish_decl may figure it out
3819 from an initial value. */
3823 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3824 STRIP_TYPE_NOPS (size);
3826 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3828 error ("size of array `%s' has non-integer type", name);
3829 size = integer_one_node;
3832 if (pedantic && integer_zerop (size))
3833 pedwarn ("ISO C forbids zero-size array `%s'", name);
3835 if (TREE_CODE (size) == INTEGER_CST)
3837 constant_expression_warning (size);
3838 if (tree_int_cst_sgn (size) < 0)
3840 error ("size of array `%s' is negative", name);
3841 size = integer_one_node;
3846 /* Make sure the array size remains visibly nonconstant
3847 even if it is (eg) a const variable with known value. */
3850 if (!flag_isoc99 && pedantic)
3852 if (TREE_CONSTANT (size))
3853 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3856 pedwarn ("ISO C90 forbids variable-size array `%s'",
3861 if (integer_zerop (size))
3863 /* A zero-length array cannot be represented with an
3864 unsigned index type, which is what we'll get with
3865 build_index_type. Create an open-ended range instead. */
3866 itype = build_range_type (sizetype, size, NULL_TREE);
3870 /* Compute the maximum valid index, that is, size - 1.
3871 Do the calculation in index_type, so that if it is
3872 a variable the computations will be done in the
3874 itype = fold (build (MINUS_EXPR, index_type,
3875 convert (index_type, size),
3876 convert (index_type, size_one_node)));
3878 /* If that overflowed, the array is too big.
3879 ??? While a size of INT_MAX+1 technically shouldn't
3880 cause an overflow (because we subtract 1), the overflow
3881 is recorded during the conversion to index_type, before
3882 the subtraction. Handling this case seems like an
3883 unnecessary complication. */
3884 if (TREE_OVERFLOW (itype))
3886 error ("size of array `%s' is too large", name);
3887 type = error_mark_node;
3893 /* We must be able to distinguish the
3894 SAVE_EXPR_CONTEXT for the variably-sized type
3895 so that we can set it correctly in
3896 set_save_expr_context. The convention is
3897 that all SAVE_EXPRs that need to be reset
3898 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3899 tree cfd = current_function_decl;
3900 if (decl_context == PARM)
3901 current_function_decl = NULL_TREE;
3902 itype = variable_size (itype);
3903 if (decl_context == PARM)
3904 current_function_decl = cfd;
3906 itype = build_index_type (itype);
3909 else if (decl_context == FIELD)
3911 if (pedantic && !flag_isoc99 && !in_system_header)
3912 pedwarn ("ISO C90 does not support flexible array members");
3914 /* ISO C99 Flexible array members are effectively identical
3915 to GCC's zero-length array extension. */
3916 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3919 /* If pedantic, complain about arrays of incomplete types. */
3921 if (pedantic && !COMPLETE_TYPE_P (type))
3922 pedwarn ("array type has incomplete element type");
3924 /* Build the array type itself, then merge any constancy or
3925 volatility into the target type. We must do it in this order
3926 to ensure that the TYPE_MAIN_VARIANT field of the array type
3927 is set correctly. */
3929 type = build_array_type (type, itype);
3931 type = c_build_qualified_type (type, type_quals);
3934 C_TYPE_VARIABLE_SIZE (type) = 1;
3936 /* The GCC extension for zero-length arrays differs from
3937 ISO flexible array members in that sizeof yields zero. */
3938 if (size && integer_zerop (size))
3941 TYPE_SIZE (type) = bitsize_zero_node;
3942 TYPE_SIZE_UNIT (type) = size_zero_node;
3944 if (decl_context != PARM
3945 && (array_ptr_quals != NULL_TREE || array_parm_static))
3947 error ("static or type qualifiers in non-parameter array declarator");
3948 array_ptr_quals = NULL_TREE;
3949 array_parm_static = 0;
3952 else if (TREE_CODE (declarator) == CALL_EXPR)
3956 /* Declaring a function type.
3957 Make sure we have a valid type for the function to return. */
3958 if (type == error_mark_node)
3963 /* Warn about some types functions can't return. */
3965 if (TREE_CODE (type) == FUNCTION_TYPE)
3967 error ("`%s' declared as function returning a function", name);
3968 type = integer_type_node;
3970 if (TREE_CODE (type) == ARRAY_TYPE)
3972 error ("`%s' declared as function returning an array", name);
3973 type = integer_type_node;
3976 /* Construct the function type and go to the next
3977 inner layer of declarator. */
3979 arg_types = grokparms (TREE_OPERAND (declarator, 1),
3981 /* Say it's a definition
3982 only for the CALL_EXPR
3983 closest to the identifier. */
3984 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
3985 /* Type qualifiers before the return type of the function
3986 qualify the return type, not the function type. */
3989 /* Type qualifiers on a function return type are normally
3990 permitted by the standard but have no effect, so give a
3991 warning at -Wextra. Qualifiers on a void return type have
3992 meaning as a GNU extension, and are banned on function
3993 definitions in ISO C. FIXME: strictly we shouldn't
3994 pedwarn for qualified void return types except on function
3995 definitions, but not doing so could lead to the undesirable
3996 state of a "volatile void" function return type not being
3997 warned about, and a use of the function being compiled
3998 with GNU semantics, with no diagnostics under -pedantic. */
3999 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4000 pedwarn ("ISO C forbids qualified void function return type");
4001 else if (extra_warnings
4002 && !(VOID_TYPE_P (type)
4003 && type_quals == TYPE_QUAL_VOLATILE))
4004 warning ("type qualifiers ignored on function return type");
4006 type = c_build_qualified_type (type, type_quals);
4008 type_quals = TYPE_UNQUALIFIED;
4010 type = build_function_type (type, arg_types);
4011 declarator = TREE_OPERAND (declarator, 0);
4013 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4014 the formal parameter list of this FUNCTION_TYPE to point to
4015 the FUNCTION_TYPE node itself. */
4020 for (link = last_function_parm_tags;
4022 link = TREE_CHAIN (link))
4023 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4026 else if (TREE_CODE (declarator) == INDIRECT_REF)
4028 /* Merge any constancy or volatility into the target type
4031 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4033 pedwarn ("ISO C forbids qualified function types");
4035 type = c_build_qualified_type (type, type_quals);
4036 type_quals = TYPE_UNQUALIFIED;
4039 type = build_pointer_type (type);
4041 /* Process a list of type modifier keywords
4042 (such as const or volatile) that were given inside the `*'. */
4044 if (TREE_TYPE (declarator))
4052 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4053 typemodlist = TREE_CHAIN (typemodlist))
4055 tree qualifier = TREE_VALUE (typemodlist);
4057 if (C_IS_RESERVED_WORD (qualifier))
4059 if (C_RID_CODE (qualifier) == RID_CONST)
4061 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4063 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4073 error ("invalid type modifier within pointer declarator");
4074 if (constp > 1 && ! flag_isoc99)
4075 pedwarn ("duplicate `const'");
4076 if (volatilep > 1 && ! flag_isoc99)
4077 pedwarn ("duplicate `volatile'");
4078 if (restrictp > 1 && ! flag_isoc99)
4079 pedwarn ("duplicate `restrict'");
4081 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4082 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4083 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4086 declarator = TREE_OPERAND (declarator, 0);
4093 /* Now TYPE has the actual type. */
4095 /* Did array size calculations overflow? */
4097 if (TREE_CODE (type) == ARRAY_TYPE
4098 && COMPLETE_TYPE_P (type)
4099 && TREE_OVERFLOW (TYPE_SIZE (type)))
4101 error ("size of array `%s' is too large", name);
4102 /* If we proceed with the array type as it is, we'll eventually
4103 crash in tree_low_cst(). */
4104 type = error_mark_node;
4107 /* If this is declaring a typedef name, return a TYPE_DECL. */
4109 if (specbits & (1 << (int) RID_TYPEDEF))
4112 /* Note that the grammar rejects storage classes
4113 in typenames, fields or parameters */
4114 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4116 pedwarn ("ISO C forbids qualified function types");
4118 type = c_build_qualified_type (type, type_quals);
4119 decl = build_decl (TYPE_DECL, declarator, type);
4120 if ((specbits & (1 << (int) RID_SIGNED))
4121 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4122 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4123 decl_attributes (&decl, returned_attrs, 0);
4127 /* Detect the case of an array type of unspecified size
4128 which came, as such, direct from a typedef name.
4129 We must copy the type, so that each identifier gets
4130 a distinct type, so that each identifier's size can be
4131 controlled separately by its own initializer. */
4133 if (type != 0 && typedef_type != 0
4134 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4135 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4137 type = build_array_type (TREE_TYPE (type), 0);
4139 C_TYPE_VARIABLE_SIZE (type) = 1;
4142 /* If this is a type name (such as, in a cast or sizeof),
4143 compute the type and return it now. */
4145 if (decl_context == TYPENAME)
4147 /* Note that the grammar rejects storage classes
4148 in typenames, fields or parameters */
4149 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4151 pedwarn ("ISO C forbids const or volatile function types");
4153 type = c_build_qualified_type (type, type_quals);
4154 decl_attributes (&type, returned_attrs, 0);
4158 /* Aside from typedefs and type names (handle above),
4159 `void' at top level (not within pointer)
4160 is allowed only in public variables.
4161 We don't complain about parms either, but that is because
4162 a better error message can be made later. */
4164 if (VOID_TYPE_P (type) && decl_context != PARM
4165 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4166 && ((specbits & (1 << (int) RID_EXTERN))
4167 || (current_scope == global_scope
4169 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4171 error ("variable or field `%s' declared void", name);
4172 type = integer_type_node;
4175 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4176 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4181 if (decl_context == PARM)
4183 tree type_as_written;
4186 /* A parameter declared as an array of T is really a pointer to T.
4187 One declared as a function is really a pointer to a function. */
4189 if (TREE_CODE (type) == ARRAY_TYPE)
4191 /* Transfer const-ness of array into that of type pointed to. */
4192 type = TREE_TYPE (type);
4194 type = c_build_qualified_type (type, type_quals);
4195 type = build_pointer_type (type);
4196 type_quals = TYPE_UNQUALIFIED;
4197 if (array_ptr_quals)
4199 tree new_ptr_quals, new_ptr_attrs;
4201 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4202 /* We don't yet implement attributes in this context. */
4203 if (new_ptr_attrs != NULL_TREE)
4204 warning ("attributes in parameter array declarator ignored");
4209 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4211 tree qualifier = TREE_VALUE (new_ptr_quals);
4213 if (C_IS_RESERVED_WORD (qualifier))
4215 if (C_RID_CODE (qualifier) == RID_CONST)
4217 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4219 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4229 error ("invalid type modifier within array declarator");
4231 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4232 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4233 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4237 else if (TREE_CODE (type) == FUNCTION_TYPE)
4239 if (pedantic && type_quals)
4240 pedwarn ("ISO C forbids qualified function types");
4242 type = c_build_qualified_type (type, type_quals);
4243 type = build_pointer_type (type);
4244 type_quals = TYPE_UNQUALIFIED;
4246 else if (type_quals)
4247 type = c_build_qualified_type (type, type_quals);
4249 type_as_written = type;
4251 decl = build_decl (PARM_DECL, declarator, type);
4253 C_DECL_VARIABLE_SIZE (decl) = 1;
4255 /* Compute the type actually passed in the parmlist,
4256 for the case where there is no prototype.
4257 (For example, shorts and chars are passed as ints.)
4258 When there is a prototype, this is overridden later. */
4260 if (type == error_mark_node)
4261 promoted_type = type;
4263 promoted_type = c_type_promotes_to (type);
4265 DECL_ARG_TYPE (decl) = promoted_type;
4266 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4268 else if (decl_context == FIELD)
4270 /* Structure field. It may not be a function. */
4272 if (TREE_CODE (type) == FUNCTION_TYPE)
4274 error ("field `%s' declared as a function", name);
4275 type = build_pointer_type (type);
4277 else if (TREE_CODE (type) != ERROR_MARK
4278 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4280 error ("field `%s' has incomplete type", name);
4281 type = error_mark_node;
4283 /* Move type qualifiers down to element of an array. */
4284 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4286 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4288 TYPE_DOMAIN (type));
4290 decl = build_decl (FIELD_DECL, declarator, type);
4291 DECL_NONADDRESSABLE_P (decl) = bitfield;
4294 C_DECL_VARIABLE_SIZE (decl) = 1;
4296 else if (TREE_CODE (type) == FUNCTION_TYPE)
4298 /* Every function declaration is "external"
4299 except for those which are inside a function body
4300 in which `auto' is used.
4301 That is a case not specified by ANSI C,
4302 and we use it for forward declarations for nested functions. */
4303 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4304 || current_scope == global_scope);
4306 if (specbits & (1 << (int) RID_AUTO)
4307 && (pedantic || current_scope == global_scope))
4308 pedwarn ("invalid storage class for function `%s'", name);
4309 if (specbits & (1 << (int) RID_REGISTER))
4310 error ("invalid storage class for function `%s'", name);
4311 if (specbits & (1 << (int) RID_THREAD))
4312 error ("invalid storage class for function `%s'", name);
4313 /* Function declaration not at file scope.
4314 Storage classes other than `extern' are not allowed
4315 and `extern' makes no difference. */
4316 if (current_scope != global_scope
4317 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4319 pedwarn ("invalid storage class for function `%s'", name);
4321 decl = build_decl (FUNCTION_DECL, declarator, type);
4322 decl = build_decl_attribute_variant (decl, decl_attr);
4324 DECL_LANG_SPECIFIC (decl)
4325 = ggc_alloc_cleared (sizeof (struct lang_decl));
4327 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4328 pedwarn ("ISO C forbids qualified function types");
4330 /* GNU C interprets a `volatile void' return type to indicate
4331 that the function does not return. */
4332 if ((type_quals & TYPE_QUAL_VOLATILE)
4333 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4334 warning ("`noreturn' function returns non-void value");
4337 DECL_EXTERNAL (decl) = 1;
4338 /* Record absence of global scope for `static' or `auto'. */
4340 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4343 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4345 /* Record presence of `inline', if it is reasonable. */
4346 if (MAIN_NAME_P (declarator))
4349 warning ("cannot inline function `main'");
4353 /* Assume that otherwise the function can be inlined. */
4354 DECL_DECLARED_INLINE_P (decl) = 1;
4356 /* Do not mark bare declarations as DECL_INLINE. Doing so
4357 in the presence of multiple declarations can result in
4358 the abstract origin pointing between the declarations,
4359 which will confuse dwarf2out. */
4362 DECL_INLINE (decl) = 1;
4363 if (specbits & (1 << (int) RID_EXTERN))
4364 current_extern_inline = 1;
4367 /* If -finline-functions, assume it can be inlined. This does
4368 two things: let the function be deferred until it is actually
4369 needed, and let dwarf2 know that the function is inlinable. */
4370 else if (flag_inline_trees == 2 && initialized)
4372 if (!DECL_INLINE (decl))
4373 DID_INLINE_FUNC (decl) = 1;
4374 DECL_INLINE (decl) = 1;
4375 DECL_DECLARED_INLINE_P (decl) = 0;
4380 /* It's a variable. */
4381 /* An uninitialized decl with `extern' is a reference. */
4382 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4384 /* Move type qualifiers down to element of an array. */
4385 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4387 int saved_align = TYPE_ALIGN(type);
4388 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4390 TYPE_DOMAIN (type));
4391 TYPE_ALIGN (type) = saved_align;
4393 else if (type_quals)
4394 type = c_build_qualified_type (type, type_quals);
4396 /* It is invalid to create an `extern' declaration for a
4397 variable if there is a global declaration that is
4399 if (extern_ref && current_scope != global_scope)
4403 global_decl = identifier_global_value (declarator);
4405 && TREE_CODE (global_decl) == VAR_DECL
4406 && !TREE_PUBLIC (global_decl))
4407 error ("variable previously declared `static' redeclared "
4411 decl = build_decl (VAR_DECL, declarator, type);
4413 C_DECL_VARIABLE_SIZE (decl) = 1;
4416 pedwarn ("%Hvariable '%D' declared `inline'",
4417 &DECL_SOURCE_LOCATION (decl), decl);
4419 DECL_EXTERNAL (decl) = extern_ref;
4421 /* At file scope, the presence of a `static' or `register' storage
4422 class specifier, or the absence of all storage class specifiers
4423 makes this declaration a definition (perhaps tentative). Also,
4424 the absence of both `static' and `register' makes it public. */
4425 if (current_scope == global_scope)
4427 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4428 | (1 << (int) RID_REGISTER)));
4429 TREE_STATIC (decl) = !extern_ref;
4431 /* Not at file scope, only `static' makes a static definition. */
4434 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4435 TREE_PUBLIC (decl) = extern_ref;
4438 if (specbits & 1 << (int) RID_THREAD)
4440 if (targetm.have_tls)
4441 DECL_THREAD_LOCAL (decl) = 1;
4443 /* A mere warning is sure to result in improper semantics
4444 at runtime. Don't bother to allow this to compile. */
4445 error ("thread-local storage not supported for this target");
4449 /* Record `register' declaration for warnings on &
4450 and in case doing stupid register allocation. */
4452 if (specbits & (1 << (int) RID_REGISTER))
4453 DECL_REGISTER (decl) = 1;
4455 /* Record constancy and volatility. */
4456 c_apply_type_quals_to_decl (type_quals, decl);
4458 /* If a type has volatile components, it should be stored in memory.
4459 Otherwise, the fact that those components are volatile
4460 will be ignored, and would even crash the compiler. */
4461 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4462 c_mark_addressable (decl);
4464 #ifdef ENABLE_CHECKING
4465 /* This is the earliest point at which we might know the assembler
4466 name of a variable. Thus, if it's known before this, die horribly. */
4467 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4471 decl_attributes (&decl, returned_attrs, 0);
4477 /* Decode the parameter-list info for a function type or function definition.
4478 The argument is the value returned by `get_parm_info' (or made in parse.y
4479 if there is an identifier list instead of a parameter decl list).
4480 These two functions are separate because when a function returns
4481 or receives functions then each is called multiple times but the order
4482 of calls is different. The last call to `grokparms' is always the one
4483 that contains the formal parameter names of a function definition.
4485 Store in `last_function_parms' a chain of the decls of parms.
4486 Also store in `last_function_parm_tags' a chain of the struct, union,
4487 and enum tags declared among the parms.
4489 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4491 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4492 a mere declaration. A nonempty identifier-list gets an error message
4493 when FUNCDEF_FLAG is zero. */
4496 grokparms (tree parms_info, int funcdef_flag)
4498 tree first_parm = TREE_CHAIN (parms_info);
4500 last_function_parms = TREE_PURPOSE (parms_info);
4501 last_function_parm_tags = TREE_VALUE (parms_info);
4503 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4504 && !in_system_header)
4505 warning ("function declaration isn't a prototype");
4508 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4511 pedwarn ("parameter names (without types) in function declaration");
4513 last_function_parms = first_parm;
4520 /* If the arg types are incomplete in a declaration,
4521 they must include undefined tags.
4522 These tags can never be defined in the scope of the declaration,
4523 so the types can never be completed,
4524 and no call can be compiled successfully. */
4525 for (parm = last_function_parms, typelt = first_parm;
4527 parm = TREE_CHAIN (parm))
4528 /* Skip over any enumeration constants declared here. */
4529 if (TREE_CODE (parm) == PARM_DECL)
4531 /* Barf if the parameter itself has an incomplete type. */
4532 tree type = TREE_VALUE (typelt);
4533 if (type == error_mark_node)
4535 if (!COMPLETE_TYPE_P (type))
4537 if (funcdef_flag && DECL_NAME (parm) != 0)
4538 error ("parameter `%s' has incomplete type",
4539 IDENTIFIER_POINTER (DECL_NAME (parm)));
4541 warning ("parameter has incomplete type");
4544 TREE_VALUE (typelt) = error_mark_node;
4545 TREE_TYPE (parm) = error_mark_node;
4548 typelt = TREE_CHAIN (typelt);
4555 /* Return a tree_list node with info on a parameter list just parsed.
4556 The TREE_PURPOSE is a chain of decls of those parms.
4557 The TREE_VALUE is a list of structure, union and enum tags defined.
4558 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4559 This tree_list node is later fed to `grokparms'.
4561 VOID_AT_END nonzero means append `void' to the end of the type-list.
4562 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4565 get_parm_info (int void_at_end)
4570 tree tags = gettags ();
4571 tree parms = getdecls ();
4573 tree order = current_scope->parm_order;
4575 /* Just `void' (and no ellipsis) is special. There are really no parms.
4576 But if the `void' is qualified (by `const' or `volatile') or has a
4577 storage class specifier (`register'), then the behavior is undefined;
4578 by not counting it as the special case of `void' we will cause an
4579 error later. Typedefs for `void' are OK (see DR#157). */
4580 if (void_at_end && parms != 0
4581 && TREE_CHAIN (parms) == 0
4582 && VOID_TYPE_P (TREE_TYPE (parms))
4583 && ! TREE_THIS_VOLATILE (parms)
4584 && ! TREE_READONLY (parms)
4585 && ! DECL_REGISTER (parms)
4586 && DECL_NAME (parms) == 0)
4589 storedecls (NULL_TREE);
4590 return tree_cons (NULL_TREE, NULL_TREE,
4591 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4594 /* Extract enumerator values and other non-parms declared with the parms.
4595 Likewise any forward parm decls that didn't have real parm decls. */
4596 for (decl = parms; decl;)
4598 tree next = TREE_CHAIN (decl);
4600 if (TREE_CODE (decl) != PARM_DECL)
4602 TREE_CHAIN (decl) = new_parms;
4605 else if (TREE_ASM_WRITTEN (decl))
4607 error ("%Hparameter '%D' has just a forward declaration",
4608 &DECL_SOURCE_LOCATION (decl), decl);
4609 TREE_CHAIN (decl) = new_parms;
4615 /* Put the parm decls back in the order they were in in the parm list. */
4616 for (t = order; t; t = TREE_CHAIN (t))
4619 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4621 TREE_CHAIN (TREE_VALUE (t)) = 0;
4624 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4627 /* Store the parmlist in the scope structure since the old one
4628 is no longer a valid list. (We have changed the chain pointers.) */
4629 storedecls (new_parms);
4631 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4632 /* There may also be declarations for enumerators if an enumeration
4633 type is declared among the parms. Ignore them here. */
4634 if (TREE_CODE (decl) == PARM_DECL)
4636 /* Since there is a prototype,
4637 args are passed in their declared types. */
4638 tree type = TREE_TYPE (decl);
4639 DECL_ARG_TYPE (decl) = type;
4640 if (PROMOTE_PROTOTYPES
4641 && INTEGRAL_TYPE_P (type)
4642 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4643 DECL_ARG_TYPE (decl) = integer_type_node;
4645 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4646 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
4647 && DECL_NAME (decl) == 0)
4649 error ("`void' in parameter list must be the entire list");
4655 return tree_cons (new_parms, tags,
4656 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
4658 return tree_cons (new_parms, tags, nreverse (types));
4661 /* At end of parameter list, warn about any struct, union or enum tags
4662 defined within. Do so because these types cannot ever become complete. */
4665 parmlist_tags_warning (void)
4670 for (elt = current_scope->tags; elt; elt = TREE_CHAIN (elt))
4672 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4673 /* An anonymous union parm type is meaningful as a GNU extension.
4674 So don't warn for that. */
4675 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
4677 if (TREE_PURPOSE (elt) != 0)
4679 if (code == RECORD_TYPE)
4680 warning ("`struct %s' declared inside parameter list",
4681 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4682 else if (code == UNION_TYPE)
4683 warning ("`union %s' declared inside parameter list",
4684 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4686 warning ("`enum %s' declared inside parameter list",
4687 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4691 /* For translation these need to be separate warnings */
4692 if (code == RECORD_TYPE)
4693 warning ("anonymous struct declared inside parameter list");
4694 else if (code == UNION_TYPE)
4695 warning ("anonymous union declared inside parameter list");
4697 warning ("anonymous enum declared inside parameter list");
4701 warning ("its scope is only this definition or declaration, which is probably not what you want");
4707 /* Get the struct, enum or union (CODE says which) with tag NAME.
4708 Define the tag as a forward-reference if it is not defined. */
4711 xref_tag (enum tree_code code, tree name)
4713 /* If a cross reference is requested, look up the type
4714 already defined for this tag and return it. */
4716 tree ref = lookup_tag (code, name, 0);
4717 /* If this is the right type of tag, return what we found.
4718 (This reference will be shadowed by shadow_tag later if appropriate.)
4719 If this is the wrong type of tag, do not return it. If it was the
4720 wrong type in the same scope, we will have had an error
4721 message already; if in a different scope and declaring
4722 a name, pending_xref_error will give an error message; but if in a
4723 different scope and not declaring a name, this tag should
4724 shadow the previous declaration of a different type of tag, and
4725 this would not work properly if we return the reference found.
4726 (For example, with "struct foo" in an outer scope, "union foo;"
4727 must shadow that tag with a new one of union type.) */
4728 if (ref && TREE_CODE (ref) == code)
4731 /* If no such tag is yet defined, create a forward-reference node
4732 and record it as the "definition".
4733 When a real declaration of this type is found,
4734 the forward-reference will be altered into a real type. */
4736 ref = make_node (code);
4737 if (code == ENUMERAL_TYPE)
4739 /* Give the type a default layout like unsigned int
4740 to avoid crashing if it does not get defined. */
4741 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4742 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4743 TYPE_USER_ALIGN (ref) = 0;
4744 TREE_UNSIGNED (ref) = 1;
4745 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4746 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4747 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4750 pushtag (name, ref);
4755 /* Make sure that the tag NAME is defined *in the current scope*
4756 at least as a forward reference.
4757 CODE says which kind of tag NAME ought to be. */
4760 start_struct (enum tree_code code, tree name)
4762 /* If there is already a tag defined at this scope
4763 (as a forward reference), just return it. */
4768 ref = lookup_tag (code, name, 1);
4769 if (ref && TREE_CODE (ref) == code)
4771 if (TYPE_FIELDS (ref))
4773 if (code == UNION_TYPE)
4774 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4776 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4781 /* Otherwise create a forward-reference just so the tag is in scope. */
4783 ref = make_node (code);
4784 pushtag (name, ref);
4787 C_TYPE_BEING_DEFINED (ref) = 1;
4788 TYPE_PACKED (ref) = flag_pack_struct;
4792 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4793 of a structure component, returning a FIELD_DECL node.
4794 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4796 This is done during the parsing of the struct declaration.
4797 The FIELD_DECL nodes are chained together and the lot of them
4798 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4801 grokfield (tree declarator, tree declspecs, tree width)
4805 if (declarator == NULL_TREE && width == NULL_TREE)
4807 /* This is an unnamed decl.
4809 If we have something of the form "union { list } ;" then this
4810 is the anonymous union extension. Similarly for struct.
4812 If this is something of the form "struct foo;", then
4813 If MS extensions are enabled, this is handled as an
4815 Otherwise this is a forward declaration of a structure tag.
4817 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4818 If MS extensions are enabled and foo names a structure, then
4819 again this is an anonymous struct.
4820 Otherwise this is an error.
4822 Oh what a horrid tangled web we weave. I wonder if MS consciously
4823 took this from Plan 9 or if it was an accident of implementation
4824 that took root before someone noticed the bug... */
4826 tree type = TREE_VALUE (declspecs);
4828 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4829 type = TREE_TYPE (type);
4830 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4832 if (flag_ms_extensions)
4835 goto warn_unnamed_field;
4836 else if (TYPE_NAME (type) == NULL)
4839 goto warn_unnamed_field;
4844 warning ("declaration does not declare anything");
4849 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4851 finish_decl (value, NULL_TREE, NULL_TREE);
4852 DECL_INITIAL (value) = width;
4854 if (c_dialect_objc ())
4855 objc_check_decl (value);
4859 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4860 the list such that this does not present a problem later. */
4863 detect_field_duplicates (tree fieldlist)
4868 /* First, see if there are more than "a few" fields.
4869 This is trivially true if there are zero or one fields. */
4872 x = TREE_CHAIN (fieldlist);
4878 } while (timeout > 0 && x);
4880 /* If there were "few" fields, avoid the overhead of allocating
4881 a hash table. Instead just do the nested traversal thing. */
4884 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4887 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4888 if (DECL_NAME (y) == DECL_NAME (x))
4890 error ("%Hduplicate member '%D'",
4891 &DECL_SOURCE_LOCATION (x), x);
4892 DECL_NAME (x) = NULL_TREE;
4898 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4901 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4902 if ((y = DECL_NAME (x)) != 0)
4904 slot = htab_find_slot (htab, y, INSERT);
4907 error ("%Hduplicate member '%D'",
4908 &DECL_SOURCE_LOCATION (x), x);
4909 DECL_NAME (x) = NULL_TREE;
4918 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4919 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4920 ATTRIBUTES are attributes to be applied to the structure. */
4923 finish_struct (tree t, tree fieldlist, tree attributes)
4926 int toplevel = global_scope == current_scope;
4927 int saw_named_field;
4929 /* If this type was previously laid out as a forward reference,
4930 make sure we lay it out again. */
4934 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4936 /* Nameless union parm types are useful as GCC extension. */
4937 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4938 /* Otherwise, warn about any struct or union def. in parmlist. */
4939 if (in_parm_level_p ())
4942 pedwarn ("%s defined inside parms",
4943 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4945 warning ("%s defined inside parms",
4946 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4951 for (x = fieldlist; x; x = TREE_CHAIN (x))
4952 if (DECL_NAME (x) != 0)
4956 pedwarn ("%s has no %s",
4957 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4958 fieldlist ? _("named members") : _("members"));
4961 /* Install struct as DECL_CONTEXT of each field decl.
4962 Also process specified field sizes,m which is found in the DECL_INITIAL.
4963 Store 0 there, except for ": 0" fields (so we can find them
4964 and delete them, below). */
4966 saw_named_field = 0;
4967 for (x = fieldlist; x; x = TREE_CHAIN (x))
4969 DECL_CONTEXT (x) = t;
4970 DECL_PACKED (x) |= TYPE_PACKED (t);
4972 /* If any field is const, the structure type is pseudo-const. */
4973 if (TREE_READONLY (x))
4974 C_TYPE_FIELDS_READONLY (t) = 1;
4977 /* A field that is pseudo-const makes the structure likewise. */
4978 tree t1 = TREE_TYPE (x);
4979 while (TREE_CODE (t1) == ARRAY_TYPE)
4980 t1 = TREE_TYPE (t1);
4981 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4982 && C_TYPE_FIELDS_READONLY (t1))
4983 C_TYPE_FIELDS_READONLY (t) = 1;
4986 /* Any field that is volatile means variables of this type must be
4987 treated in some ways as volatile. */
4988 if (TREE_THIS_VOLATILE (x))
4989 C_TYPE_FIELDS_VOLATILE (t) = 1;
4991 /* Any field of nominal variable size implies structure is too. */
4992 if (C_DECL_VARIABLE_SIZE (x))
4993 C_TYPE_VARIABLE_SIZE (t) = 1;
4995 /* Detect invalid nested redefinition. */
4996 if (TREE_TYPE (x) == t)
4997 error ("nested redefinition of `%s'",
4998 IDENTIFIER_POINTER (TYPE_NAME (t)));
5000 /* Detect invalid bit-field size. */
5001 if (DECL_INITIAL (x))
5002 STRIP_NOPS (DECL_INITIAL (x));
5003 if (DECL_INITIAL (x))
5005 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5006 constant_expression_warning (DECL_INITIAL (x));
5009 error ("%Hbit-field '%D' width not an integer constant",
5010 &DECL_SOURCE_LOCATION (x), x);
5011 DECL_INITIAL (x) = NULL;
5015 /* Detect invalid bit-field type. */
5016 if (DECL_INITIAL (x)
5017 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5018 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5019 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5021 error ("%Hbit-field '%D' has invalid type",
5022 &DECL_SOURCE_LOCATION (x), x);
5023 DECL_INITIAL (x) = NULL;
5026 if (DECL_INITIAL (x) && pedantic
5027 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5028 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5029 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != boolean_type_node
5030 /* Accept an enum that's equivalent to int or unsigned int. */
5031 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5032 && (TYPE_PRECISION (TREE_TYPE (x))
5033 == TYPE_PRECISION (integer_type_node))))
5034 pedwarn ("%Hbit-field '%D' type invalid in ISO C",
5035 &DECL_SOURCE_LOCATION (x), x);
5037 /* Detect and ignore out of range field width and process valid
5039 if (DECL_INITIAL (x))
5042 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == boolean_type_node
5043 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5045 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5046 error ("%Hnegative width in bit-field '%D'",
5047 &DECL_SOURCE_LOCATION (x), x);
5048 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5049 pedwarn ("%Hwidth of '%D' exceeds its type",
5050 &DECL_SOURCE_LOCATION (x), x);
5051 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5052 error ("%Hzero width for bit-field '%D'",
5053 &DECL_SOURCE_LOCATION (x), x);
5056 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5057 unsigned HOST_WIDE_INT width
5058 = tree_low_cst (DECL_INITIAL (x), 1);
5060 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5061 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5062 TREE_UNSIGNED (TREE_TYPE (x)))
5064 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5065 TREE_UNSIGNED (TREE_TYPE (x))))))
5066 warning ("%H'%D' is narrower than values of its type",
5067 &DECL_SOURCE_LOCATION (x), x);
5069 DECL_SIZE (x) = bitsize_int (width);
5070 DECL_BIT_FIELD (x) = 1;
5071 SET_DECL_C_BIT_FIELD (x);
5075 DECL_INITIAL (x) = 0;
5077 /* Detect flexible array member in an invalid context. */
5078 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5079 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5080 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5081 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5083 if (TREE_CODE (t) == UNION_TYPE)
5084 error ("%Hflexible array member in union",
5085 &DECL_SOURCE_LOCATION (x));
5086 else if (TREE_CHAIN (x) != NULL_TREE)
5087 error ("%Hflexible array member not at end of struct",
5088 &DECL_SOURCE_LOCATION (x));
5089 else if (! saw_named_field)
5090 error ("%Hflexible array member in otherwise empty struct",
5091 &DECL_SOURCE_LOCATION (x));
5094 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5095 && flexible_array_type_p (TREE_TYPE (x)))
5096 pedwarn ("%Hinvalid use of structure with flexible array member",
5097 &DECL_SOURCE_LOCATION (x));
5100 saw_named_field = 1;
5103 detect_field_duplicates (fieldlist);
5105 /* Now we have the nearly final fieldlist. Record it,
5106 then lay out the structure or union (including the fields). */
5108 TYPE_FIELDS (t) = fieldlist;
5112 /* Delete all zero-width bit-fields from the fieldlist */
5114 tree *fieldlistp = &fieldlist;
5116 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5117 *fieldlistp = TREE_CHAIN (*fieldlistp);
5119 fieldlistp = &TREE_CHAIN (*fieldlistp);
5122 /* Now we have the truly final field list.
5123 Store it in this type and in the variants. */
5125 TYPE_FIELDS (t) = fieldlist;
5127 /* If there are lots of fields, sort so we can look through them fast.
5128 We arbitrarily consider 16 or more elts to be "a lot". */
5133 for (x = fieldlist; x; x = TREE_CHAIN (x))
5135 if (len > 15 || DECL_NAME (x) == NULL)
5143 struct lang_type *space;
5144 struct sorted_fields_type *space2;
5146 len += list_length (x);
5148 /* Use the same allocation policy here that make_node uses, to
5149 ensure that this lives as long as the rest of the struct decl.
5150 All decls in an inline function need to be saved. */
5152 space = ggc_alloc (sizeof (struct lang_type));
5153 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5157 field_array = &space2->elts[0];
5158 for (x = fieldlist; x; x = TREE_CHAIN (x))
5160 field_array[len++] = x;
5162 /* If there is anonymous struct or union, break out of the loop. */
5163 if (DECL_NAME (x) == NULL)
5166 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5169 TYPE_LANG_SPECIFIC (t) = space;
5170 TYPE_LANG_SPECIFIC (t)->s->len = len;
5171 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5172 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5177 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5179 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5180 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5181 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5182 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5185 /* If this was supposed to be a transparent union, but we can't
5186 make it one, warn and turn off the flag. */
5187 if (TREE_CODE (t) == UNION_TYPE
5188 && TYPE_TRANSPARENT_UNION (t)
5189 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5191 TYPE_TRANSPARENT_UNION (t) = 0;
5192 warning ("union cannot be made transparent");
5195 /* If this structure or union completes the type of any previous
5196 variable declaration, lay it out and output its rtl. */
5198 if (current_scope->incomplete_list != NULL_TREE)
5200 tree prev = NULL_TREE;
5202 for (x = current_scope->incomplete_list; x; x = TREE_CHAIN (x))
5204 tree decl = TREE_VALUE (x);
5206 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5207 && TREE_CODE (decl) != TYPE_DECL)
5209 layout_decl (decl, 0);
5210 /* This is a no-op in c-lang.c or something real in objc-act.c. */
5211 if (c_dialect_objc ())
5212 objc_check_decl (decl);
5213 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5216 /* Unlink X from the incomplete list. */
5218 TREE_CHAIN (prev) = TREE_CHAIN (x);
5220 current_scope->incomplete_list = TREE_CHAIN (x);
5222 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5223 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5225 tree element = TREE_TYPE (decl);
5226 while (TREE_CODE (element) == ARRAY_TYPE)
5227 element = TREE_TYPE (element);
5230 layout_array_type (TREE_TYPE (decl));
5231 if (TREE_CODE (decl) != TYPE_DECL)
5233 layout_decl (decl, 0);
5234 if (c_dialect_objc ())
5235 objc_check_decl (decl);
5236 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5240 /* Unlink X from the incomplete list. */
5242 TREE_CHAIN (prev) = TREE_CHAIN (x);
5244 current_scope->incomplete_list = TREE_CHAIN (x);
5250 /* Finish debugging output for this type. */
5251 rest_of_type_compilation (t, toplevel);
5256 /* Lay out the type T, and its element type, and so on. */
5259 layout_array_type (tree t)
5261 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5262 layout_array_type (TREE_TYPE (t));
5266 /* Begin compiling the definition of an enumeration type.
5267 NAME is its name (or null if anonymous).
5268 Returns the type object, as yet incomplete.
5269 Also records info about it so that build_enumerator
5270 may be used to declare the individual values as they are read. */
5273 start_enum (tree name)
5277 /* If this is the real definition for a previous forward reference,
5278 fill in the contents in the same object that used to be the
5279 forward reference. */
5282 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5284 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5286 enumtype = make_node (ENUMERAL_TYPE);
5287 pushtag (name, enumtype);
5290 C_TYPE_BEING_DEFINED (enumtype) = 1;
5292 if (TYPE_VALUES (enumtype) != 0)
5294 /* This enum is a named one that has been declared already. */
5295 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5297 /* Completely replace its old definition.
5298 The old enumerators remain defined, however. */
5299 TYPE_VALUES (enumtype) = 0;
5302 enum_next_value = integer_zero_node;
5305 if (flag_short_enums)
5306 TYPE_PACKED (enumtype) = 1;
5311 /* After processing and defining all the values of an enumeration type,
5312 install their decls in the enumeration type and finish it off.
5313 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5314 and ATTRIBUTES are the specified attributes.
5315 Returns ENUMTYPE. */
5318 finish_enum (tree enumtype, tree values, tree attributes)
5321 tree minnode = 0, maxnode = 0, enum_value_type;
5322 int precision, unsign;
5323 int toplevel = (global_scope == current_scope);
5325 if (in_parm_level_p ())
5326 warning ("enum defined inside parms");
5328 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5330 /* Calculate the maximum value of any enumerator in this type. */
5332 if (values == error_mark_node)
5333 minnode = maxnode = integer_zero_node;
5336 minnode = maxnode = TREE_VALUE (values);
5337 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5339 tree value = TREE_VALUE (pair);
5340 if (tree_int_cst_lt (maxnode, value))
5342 if (tree_int_cst_lt (value, minnode))
5347 /* Construct the final type of this enumeration. It is the same
5348 as one of the integral types - the narrowest one that fits, except
5349 that normally we only go as narrow as int - and signed iff any of
5350 the values are negative. */
5351 unsign = (tree_int_cst_sgn (minnode) >= 0);
5352 precision = MAX (min_precision (minnode, unsign),
5353 min_precision (maxnode, unsign));
5354 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5356 tree narrowest = c_common_type_for_size (precision, unsign);
5359 warning ("enumeration values exceed range of largest integer");
5360 narrowest = long_long_integer_type_node;
5363 precision = TYPE_PRECISION (narrowest);
5366 precision = TYPE_PRECISION (integer_type_node);
5368 if (precision == TYPE_PRECISION (integer_type_node))
5369 enum_value_type = c_common_type_for_size (precision, 0);
5371 enum_value_type = enumtype;
5373 TYPE_MIN_VALUE (enumtype) = minnode;
5374 TYPE_MAX_VALUE (enumtype) = maxnode;
5375 TYPE_PRECISION (enumtype) = precision;
5376 TREE_UNSIGNED (enumtype) = unsign;
5377 TYPE_SIZE (enumtype) = 0;
5378 layout_type (enumtype);
5380 if (values != error_mark_node)
5382 /* Change the type of the enumerators to be the enum type. We
5383 need to do this irrespective of the size of the enum, for
5384 proper type checking. Replace the DECL_INITIALs of the
5385 enumerators, and the value slots of the list, with copies
5386 that have the enum type; they cannot be modified in place
5387 because they may be shared (e.g. integer_zero_node) Finally,
5388 change the purpose slots to point to the names of the decls. */
5389 for (pair = values; pair; pair = TREE_CHAIN (pair))
5391 tree enu = TREE_PURPOSE (pair);
5393 TREE_TYPE (enu) = enumtype;
5395 /* The ISO C Standard mandates enumerators to have type int,
5396 even though the underlying type of an enum type is
5397 unspecified. Here we convert any enumerators that fit in
5398 an int to type int, to avoid promotions to unsigned types
5399 when comparing integers with enumerators that fit in the
5400 int range. When -pedantic is given, build_enumerator()
5401 would have already taken care of those that don't fit. */
5402 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5403 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5405 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5407 TREE_PURPOSE (pair) = DECL_NAME (enu);
5408 TREE_VALUE (pair) = DECL_INITIAL (enu);
5411 TYPE_VALUES (enumtype) = values;
5414 /* Fix up all variant types of this enum type. */
5415 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5417 if (tem == enumtype)
5419 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5420 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5421 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5422 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5423 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5424 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5425 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5426 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5427 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5428 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5431 /* Finish debugging output for this type. */
5432 rest_of_type_compilation (enumtype, toplevel);
5437 /* Build and install a CONST_DECL for one value of the
5438 current enumeration type (one that was begun with start_enum).
5439 Return a tree-list containing the CONST_DECL and its value.
5440 Assignment of sequential values by default is handled here. */
5443 build_enumerator (tree name, tree value)
5447 /* Validate and default VALUE. */
5449 /* Remove no-op casts from the value. */
5451 STRIP_TYPE_NOPS (value);
5455 if (TREE_CODE (value) == INTEGER_CST)
5457 value = default_conversion (value);
5458 constant_expression_warning (value);
5462 error ("enumerator value for `%s' not integer constant",
5463 IDENTIFIER_POINTER (name));
5468 /* Default based on previous value. */
5469 /* It should no longer be possible to have NON_LVALUE_EXPR
5473 value = enum_next_value;
5475 error ("overflow in enumeration values");
5478 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5480 pedwarn ("ISO C restricts enumerator values to range of `int'");
5481 value = convert (integer_type_node, value);
5484 /* Set basis for default for next value. */
5485 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5486 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5488 /* Now create a declaration for the enum value name. */
5490 type = TREE_TYPE (value);
5491 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5492 TYPE_PRECISION (integer_type_node)),
5493 (TYPE_PRECISION (type)
5494 >= TYPE_PRECISION (integer_type_node)
5495 && TREE_UNSIGNED (type)));
5497 decl = build_decl (CONST_DECL, name, type);
5498 DECL_INITIAL (decl) = convert (type, value);
5501 return tree_cons (decl, value, NULL_TREE);
5505 /* Create the FUNCTION_DECL for a function definition.
5506 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5507 the declaration; they describe the function's name and the type it returns,
5508 but twisted together in a fashion that parallels the syntax of C.
5510 This function creates a binding context for the function body
5511 as well as setting up the FUNCTION_DECL in current_function_decl.
5513 Returns 1 on success. If the DECLARATOR is not suitable for a function
5514 (it defines a datum instead), we return 0, which tells
5515 yyparse to report a parse error. */
5518 start_function (tree declspecs, tree declarator, tree attributes)
5520 tree decl1, old_decl;
5522 int old_immediate_size_expand = immediate_size_expand;
5524 current_function_returns_value = 0; /* Assume, until we see it does. */
5525 current_function_returns_null = 0;
5526 current_function_returns_abnormally = 0;
5527 warn_about_return_type = 0;
5528 current_extern_inline = 0;
5530 /* Don't expand any sizes in the return type of the function. */
5531 immediate_size_expand = 0;
5533 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5535 /* If the declarator is not suitable for a function definition,
5536 cause a syntax error. */
5539 immediate_size_expand = old_immediate_size_expand;
5543 decl_attributes (&decl1, attributes, 0);
5545 if (DECL_DECLARED_INLINE_P (decl1)
5546 && DECL_UNINLINABLE (decl1)
5547 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5548 warning ("%Hinline function '%D' given attribute noinline",
5549 &DECL_SOURCE_LOCATION (decl1), decl1);
5551 announce_function (decl1);
5553 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5555 error ("return type is an incomplete type");
5556 /* Make it return void instead. */
5558 = build_function_type (void_type_node,
5559 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5562 if (warn_about_return_type)
5563 pedwarn_c99 ("return type defaults to `int'");
5565 /* Save the parm names or decls from this function's declarator
5566 where store_parm_decls will find them. */
5567 current_function_parms = last_function_parms;
5568 current_function_parm_tags = last_function_parm_tags;
5570 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5571 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5572 DECL_INITIAL (decl1) = error_mark_node;
5574 /* If this definition isn't a prototype and we had a prototype declaration
5575 before, copy the arg type info from that prototype.
5576 But not if what we had before was a builtin function. */
5577 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5578 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5579 && !DECL_BUILT_IN (old_decl)
5580 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5581 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5582 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5584 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5585 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5588 /* Optionally warn of old-fashioned def with no previous prototype. */
5589 if (warn_strict_prototypes
5590 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5591 && C_DECL_ISNT_PROTOTYPE (old_decl))
5592 warning ("function declaration isn't a prototype");
5593 /* Optionally warn of any global def with no previous prototype. */
5594 else if (warn_missing_prototypes
5595 && TREE_PUBLIC (decl1)
5596 && ! MAIN_NAME_P (DECL_NAME (decl1))
5597 && C_DECL_ISNT_PROTOTYPE (old_decl))
5598 warning ("%Hno previous prototype for '%D'",
5599 &DECL_SOURCE_LOCATION (decl1), decl1);
5600 /* Optionally warn of any def with no previous prototype
5601 if the function has already been used. */
5602 else if (warn_missing_prototypes
5603 && old_decl != 0 && TREE_USED (old_decl)
5604 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5605 warning ("%H'%D' was used with no prototype before its definition",
5606 &DECL_SOURCE_LOCATION (decl1), decl1);
5607 /* Optionally warn of any global def with no previous declaration. */
5608 else if (warn_missing_declarations
5609 && TREE_PUBLIC (decl1)
5611 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5612 warning ("%Hno previous declaration for '%D'",
5613 &DECL_SOURCE_LOCATION (decl1), decl1);
5614 /* Optionally warn of any def with no previous declaration
5615 if the function has already been used. */
5616 else if (warn_missing_declarations
5617 && old_decl != 0 && TREE_USED (old_decl)
5618 && C_DECL_IMPLICIT (old_decl))
5619 warning ("%H`%D' was used with no declaration before its definition",
5620 &DECL_SOURCE_LOCATION (decl1), decl1);
5622 /* This is a definition, not a reference.
5623 So normally clear DECL_EXTERNAL.
5624 However, `extern inline' acts like a declaration
5625 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5626 DECL_EXTERNAL (decl1) = current_extern_inline;
5628 /* This function exists in static storage.
5629 (This does not mean `static' in the C sense!) */
5630 TREE_STATIC (decl1) = 1;
5632 /* A nested function is not global. */
5633 if (current_function_decl != 0)
5634 TREE_PUBLIC (decl1) = 0;
5636 #ifdef ENABLE_CHECKING
5637 /* This is the earliest point at which we might know the assembler
5638 name of the function. Thus, if it's set before this, die horribly. */
5639 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5643 /* If #pragma weak was used, mark the decl weak now. */
5644 if (current_scope == global_scope)
5645 maybe_apply_pragma_weak (decl1);
5647 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5648 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5652 const location_t *locus = &DECL_SOURCE_LOCATION (decl1);
5654 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5655 != integer_type_node)
5656 pedwarn ("%Hreturn type of '%D' is not `int'", locus, decl1);
5658 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5659 args = TREE_CHAIN (args))
5661 tree type = args ? TREE_VALUE (args) : 0;
5663 if (type == void_type_node)
5670 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5671 pedwarn ("%Hfirst argument of '%D' should be `int'",
5676 if (TREE_CODE (type) != POINTER_TYPE
5677 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5678 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5680 pedwarn ("%Hsecond argument of '%D' should be 'char **'",
5685 if (TREE_CODE (type) != POINTER_TYPE
5686 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5687 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5689 pedwarn ("%Hthird argument of '%D' should probably be "
5690 "'char **'", locus, decl1);
5695 /* It is intentional that this message does not mention the third
5696 argument because it's only mentioned in an appendix of the
5698 if (argct > 0 && (argct < 2 || argct > 3))
5699 pedwarn ("%H'%D' takes only zero or two arguments", locus, decl1);
5701 if (! TREE_PUBLIC (decl1))
5702 pedwarn ("%H'%D' is normally a non-static function", locus, decl1);
5705 /* Record the decl so that the function name is defined.
5706 If we already have a decl for this name, and it is a FUNCTION_DECL,
5707 use the old decl. */
5709 current_function_decl = pushdecl (decl1);
5712 declare_parm_level ();
5714 make_decl_rtl (current_function_decl, NULL);
5716 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5717 /* Promote the value to int before returning it. */
5718 if (c_promoting_integer_type_p (restype))
5720 /* It retains unsignedness if not really getting wider. */
5721 if (TREE_UNSIGNED (restype)
5722 && (TYPE_PRECISION (restype)
5723 == TYPE_PRECISION (integer_type_node)))
5724 restype = unsigned_type_node;
5726 restype = integer_type_node;
5728 DECL_RESULT (current_function_decl)
5729 = build_decl (RESULT_DECL, NULL_TREE, restype);
5731 /* If this fcn was already referenced via a block-scope `extern' decl
5732 (or an implicit decl), propagate certain information about the usage. */
5733 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5734 TREE_ADDRESSABLE (current_function_decl) = 1;
5736 immediate_size_expand = old_immediate_size_expand;
5738 start_fname_decls ();
5743 /* Store the parameter declarations into the current function declaration.
5744 This is called after parsing the parameter declarations, before
5745 digesting the body of the function.
5747 For an old-style definition, modify the function's type
5748 to specify at least the number of arguments. */
5751 store_parm_decls (void)
5753 tree fndecl = current_function_decl;
5756 /* This is either a chain of PARM_DECLs (if a prototype was used)
5757 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5758 tree specparms = current_function_parms;
5760 /* This is a list of types declared among parms in a prototype. */
5761 tree parmtags = current_function_parm_tags;
5763 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5764 tree parmdecls = getdecls ();
5766 /* This is a chain of any other decls that came in among the parm
5767 declarations. If a parm is declared with enum {foo, bar} x;
5768 then CONST_DECLs for foo and bar are put here. */
5771 /* The function containing FNDECL, if any. */
5772 tree context = decl_function_context (fndecl);
5774 /* Nonzero if this definition is written with a prototype. */
5777 bool saved_warn_shadow = warn_shadow;
5779 /* Don't re-emit shadow warnings. */
5780 warn_shadow = false;
5782 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5784 /* This case is when the function was defined with an ANSI prototype.
5785 The parms already have decls, so we need not do anything here
5786 except record them as in effect
5787 and complain if any redundant old-style parm decls were written. */
5798 error ("%Hparm types given both in parmlist and separately",
5799 &DECL_SOURCE_LOCATION (fndecl));
5800 /* Get rid of the erroneous decls; don't keep them on
5801 the list of parms, since they might not be PARM_DECLs. */
5802 for (decl = current_scope->names;
5803 decl; decl = TREE_CHAIN (decl))
5804 if (DECL_NAME (decl))
5805 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = 0;
5806 for (link = current_scope->shadowed;
5807 link; link = TREE_CHAIN (link))
5808 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5809 current_scope->names = 0;
5810 current_scope->shadowed = 0;
5813 specparms = nreverse (specparms);
5814 for (parm = specparms; parm; parm = next)
5816 const location_t *locus = &DECL_SOURCE_LOCATION (parm);
5817 next = TREE_CHAIN (parm);
5818 if (TREE_CODE (parm) == PARM_DECL)
5820 if (DECL_NAME (parm) == 0)
5821 error ("%Hparameter name omitted", locus);
5822 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
5823 && VOID_TYPE_P (TREE_TYPE (parm)))
5825 error ("%Hparameter '%D' declared void", locus, parm);
5826 /* Change the type to error_mark_node so this parameter
5827 will be ignored by assign_parms. */
5828 TREE_TYPE (parm) = error_mark_node;
5834 /* If we find an enum constant or a type tag,
5835 put it aside for the moment. */
5836 TREE_CHAIN (parm) = 0;
5837 others = chainon (others, parm);
5841 /* Get the decls in their original chain order
5842 and record in the function. */
5843 DECL_ARGUMENTS (fndecl) = getdecls ();
5845 /* Now pushdecl the enum constants. */
5846 for (parm = others; parm; parm = next)
5848 next = TREE_CHAIN (parm);
5849 if (DECL_NAME (parm) == 0)
5851 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5853 else if (TREE_CODE (parm) != PARM_DECL)
5857 storetags (chainon (parmtags, gettags ()));
5861 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5862 each with a parm name as the TREE_VALUE.
5864 PARMDECLS is a chain of declarations for parameters.
5865 Warning! It can also contain CONST_DECLs which are not parameters
5866 but are names of enumerators of any enum types
5867 declared among the parameters.
5869 First match each formal parameter name with its declaration.
5870 Associate decls with the names and store the decls
5871 into the TREE_PURPOSE slots. */
5873 /* We use DECL_WEAK as a flag to show which parameters have been
5874 seen already since it is not used on PARM_DECL or CONST_DECL. */
5875 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5876 DECL_WEAK (parm) = 0;
5878 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5880 tree tail, found = NULL;
5882 if (TREE_VALUE (parm) == 0)
5884 error ("%Hparameter name missing from parameter list",
5885 &DECL_SOURCE_LOCATION (fndecl));
5886 TREE_PURPOSE (parm) = 0;
5890 /* See if any of the parmdecls specifies this parm by name.
5891 Ignore any enumerator decls. */
5892 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5893 if (DECL_NAME (tail) == TREE_VALUE (parm)
5894 && TREE_CODE (tail) == PARM_DECL)
5900 /* If declaration already marked, we have a duplicate name.
5901 Complain, and don't use this decl twice. */
5902 if (found && DECL_WEAK (found))
5904 error ("%Hmultiple parameters named '%D'",
5905 &DECL_SOURCE_LOCATION (found), found);
5909 /* If the declaration says "void", complain and ignore it. */
5910 if (found && VOID_TYPE_P (TREE_TYPE (found)))
5912 error ("%Hparameter '%D' declared void",
5913 &DECL_SOURCE_LOCATION (found), found);
5914 TREE_TYPE (found) = integer_type_node;
5915 DECL_ARG_TYPE (found) = integer_type_node;
5916 layout_decl (found, 0);
5919 /* If no declaration found, default to int. */
5922 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5924 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5925 DECL_SOURCE_LOCATION (found) = DECL_SOURCE_LOCATION (fndecl);
5927 pedwarn ("%Htype of '%D' defaults to `int'",
5928 &DECL_SOURCE_LOCATION (found), found);
5929 else if (extra_warnings)
5930 warning ("%Htype of '%D' defaults to `int'",
5931 &DECL_SOURCE_LOCATION (found), found);
5935 TREE_PURPOSE (parm) = found;
5937 /* Mark this decl as "already found". */
5938 DECL_WEAK (found) = 1;
5941 /* Put anything which is on the parmdecls chain and which is
5942 not a PARM_DECL onto the list NONPARMS. (The types of
5943 non-parm things which might appear on the list include
5944 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5945 any actual PARM_DECLs not matched with any names. */
5948 for (parm = parmdecls; parm;)
5950 const location_t *locus = &DECL_SOURCE_LOCATION (parm);
5951 tree next = TREE_CHAIN (parm);
5952 TREE_CHAIN (parm) = 0;
5954 if (TREE_CODE (parm) != PARM_DECL)
5955 nonparms = chainon (nonparms, parm);
5958 /* Complain about args with incomplete types. */
5959 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5961 error ("%Hparameter '%D' has incomplete type", locus, parm);
5962 TREE_TYPE (parm) = error_mark_node;
5965 if (! DECL_WEAK (parm))
5967 error ("%Hdeclaration for parameter '%D' but no such "
5968 "parameter", locus, parm);
5969 /* Pretend the parameter was not missing.
5970 This gets us to a standard state and minimizes
5971 further error messages. */
5973 = chainon (specparms,
5974 tree_cons (parm, NULL_TREE, NULL_TREE));
5981 /* Chain the declarations together in the order of the list of
5982 names. Store that chain in the function decl, replacing the
5985 DECL_ARGUMENTS (fndecl) = 0;
5988 for (last = 0; parm; parm = TREE_CHAIN (parm))
5989 if (TREE_PURPOSE (parm))
5992 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
5994 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5995 last = TREE_PURPOSE (parm);
5996 TREE_CHAIN (last) = 0;
6000 /* If there was a previous prototype,
6001 set the DECL_ARG_TYPE of each argument according to
6002 the type previously specified, and report any mismatches. */
6004 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6007 for (parm = DECL_ARGUMENTS (fndecl),
6008 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6009 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6010 != void_type_node));
6011 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6013 if (parm == 0 || type == 0
6014 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6016 error ("number of arguments doesn't match prototype");
6017 error ("%Hprototype declaration",
6018 ¤t_function_prototype_locus);
6021 /* Type for passing arg must be consistent with that
6022 declared for the arg. ISO C says we take the unqualified
6023 type for parameters declared with qualified type. */
6024 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6025 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
6028 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6029 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6031 /* Adjust argument to match prototype. E.g. a previous
6032 `int foo(float);' prototype causes
6033 `int foo(x) float x; {...}' to be treated like
6034 `int foo(float x) {...}'. This is particularly
6035 useful for argument types like uid_t. */
6036 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6038 if (PROMOTE_PROTOTYPES
6039 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6040 && TYPE_PRECISION (TREE_TYPE (parm))
6041 < TYPE_PRECISION (integer_type_node))
6042 DECL_ARG_TYPE (parm) = integer_type_node;
6046 pedwarn ("promoted argument `%s' doesn't match prototype",
6047 IDENTIFIER_POINTER (DECL_NAME (parm)));
6048 warning ("%Hprototype declaration",
6049 ¤t_function_prototype_locus);
6054 error ("argument `%s' doesn't match prototype",
6055 IDENTIFIER_POINTER (DECL_NAME (parm)));
6056 error ("%Hprototype declaration",
6057 ¤t_function_prototype_locus);
6061 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6064 /* Otherwise, create a prototype that would match. */
6068 tree actual = 0, last = 0, type;
6070 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6072 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6074 TREE_CHAIN (last) = type;
6079 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6081 TREE_CHAIN (last) = type;
6085 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6086 of the type of this function, but we need to avoid having this
6087 affect the types of other similarly-typed functions, so we must
6088 first force the generation of an identical (but separate) type
6089 node for the relevant function type. The new node we create
6090 will be a variant of the main variant of the original function
6093 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6095 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6098 /* Now store the final chain of decls for the arguments
6099 as the decl-chain of the current lexical scope.
6100 Put the enumerators in as well, at the front so that
6101 DECL_ARGUMENTS is not modified. */
6103 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6106 /* Make sure the scope for the top of the function body
6107 gets a BLOCK if there are any in the function.
6108 Otherwise, the dbx output is wrong. */
6110 keep_next_if_subblocks = 1;
6112 /* Write a record describing this function definition to the prototypes
6113 file (if requested). */
6115 gen_aux_info_record (fndecl, 1, 0, prototype);
6117 /* Initialize the RTL code for the function. */
6118 init_function_start (fndecl);
6120 /* Begin the statement tree for this function. */
6121 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6123 /* If this is a nested function, save away the sizes of any
6124 variable-size types so that we can expand them when generating
6130 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6131 = nreverse (get_pending_sizes ());
6132 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6135 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6138 /* This function is being processed in whole-function mode. */
6139 cfun->x_whole_function_mode_p = 1;
6141 /* Even though we're inside a function body, we still don't want to
6142 call expand_expr to calculate the size of a variable-sized array.
6143 We haven't necessarily assigned RTL to all variables yet, so it's
6144 not safe to try to expand expressions involving them. */
6145 immediate_size_expand = 0;
6146 cfun->x_dont_save_pending_sizes_p = 1;
6148 warn_shadow = saved_warn_shadow;
6151 /* Finish up a function declaration and compile that function
6152 all the way to assembler language output. The free the storage
6153 for the function definition.
6155 This is called after parsing the body of the function definition.
6157 NESTED is nonzero if the function being finished is nested in another.
6158 CAN_DEFER_P is nonzero if the function may be deferred. */
6161 finish_function (int nested, int can_defer_p)
6163 tree fndecl = current_function_decl;
6165 /* When a function declaration is totally empty, e.g.
6167 (the argument list is irrelevant) the compstmt rule will not
6168 bother calling pushlevel/poplevel, which means we get here with
6169 the scope stack out of sync. Detect this situation by
6170 noticing that current_scope is still as
6171 store_parm_decls left it, and do a dummy push/pop to get back to
6172 consistency. Note that the call to pushlevel does not actually
6173 push another scope - see there for details. */
6174 if (current_scope->parm_flag && keep_next_if_subblocks)
6180 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6182 /* Must mark the RESULT_DECL as being in this function. */
6184 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6186 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6188 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6189 != integer_type_node)
6191 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6192 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6194 pedwarn ("%Hreturn type of '%D' is not `int'",
6195 &DECL_SOURCE_LOCATION (fndecl), fndecl);
6199 #ifdef DEFAULT_MAIN_RETURN
6200 /* Make it so that `main' always returns success by default. */
6201 DEFAULT_MAIN_RETURN;
6204 c_expand_return (integer_zero_node);
6209 finish_fname_decls ();
6211 /* Tie off the statement tree for this function. */
6212 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6214 /* Complain if there's just no return statement. */
6215 if (warn_return_type
6216 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6217 && !current_function_returns_value && !current_function_returns_null
6218 /* Don't complain if we abort. */
6219 && !current_function_returns_abnormally
6220 /* Don't warn for main(). */
6221 && !MAIN_NAME_P (DECL_NAME (fndecl))
6222 /* Or if they didn't actually specify a return type. */
6223 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6224 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6225 inline function, as we might never be compiled separately. */
6226 && DECL_INLINE (fndecl))
6227 warning ("no return statement in function returning non-void");
6229 /* Clear out memory we no longer need. */
6230 free_after_parsing (cfun);
6231 /* Since we never call rest_of_compilation, we never clear
6232 CFUN. Do so explicitly. */
6233 free_after_compilation (cfun);
6236 if (flag_unit_at_a_time && can_defer_p)
6238 cgraph_finalize_function (fndecl, DECL_SAVED_TREE (fndecl));
6239 current_function_decl = NULL;
6245 /* Function is parsed.
6246 Generate RTL for the body of this function or defer
6247 it for later expansion. */
6248 int uninlinable = 1;
6250 /* There's no reason to do any of the work here if we're only doing
6251 semantic analysis; this code just generates RTL. */
6252 if (flag_syntax_only)
6254 current_function_decl = NULL;
6255 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6259 if (flag_inline_trees)
6261 /* First, cache whether the current function is inlinable. Some
6262 predicates depend on cfun and current_function_decl to
6263 function completely. */
6264 timevar_push (TV_INTEGRATION);
6265 uninlinable = ! tree_inlinable_function_p (fndecl, 0);
6268 /* We defer functions marked inline *even if* the function
6269 itself is not inlinable. This is because we don't yet
6270 know if the function will actually be used; we may be
6271 able to avoid emitting it entirely. */
6272 && (! uninlinable || DECL_DECLARED_INLINE_P (fndecl))
6273 /* Save function tree for inlining. Should return 0 if the
6274 language does not support function deferring or the
6275 function could not be deferred. */
6276 && defer_fn (fndecl))
6278 /* Let the back-end know that this function exists. */
6279 (*debug_hooks->deferred_inline_function) (fndecl);
6280 timevar_pop (TV_INTEGRATION);
6281 current_function_decl = NULL;
6285 /* Then, inline any functions called in it. */
6286 optimize_inline_calls (fndecl);
6287 timevar_pop (TV_INTEGRATION);
6290 c_expand_body (fndecl);
6292 /* Keep the function body if it's needed for inlining or dumping. */
6293 if (uninlinable && !dump_enabled_p (TDI_all))
6295 /* Allow the body of the function to be garbage collected. */
6296 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6299 /* Let the error reporting routines know that we're outside a
6300 function. For a nested function, this value is used in
6301 c_pop_function_context and then reset via pop_function_context. */
6302 current_function_decl = NULL;
6306 /* Generate the RTL for a deferred function FNDECL. */
6309 c_expand_deferred_function (tree fndecl)
6311 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6312 function was deferred, e.g. in duplicate_decls. */
6313 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6315 if (flag_inline_trees)
6317 timevar_push (TV_INTEGRATION);
6318 optimize_inline_calls (fndecl);
6319 timevar_pop (TV_INTEGRATION);
6321 c_expand_body (fndecl);
6322 current_function_decl = NULL;
6326 /* Called to move the SAVE_EXPRs for parameter declarations in a
6327 nested function into the nested function. DATA is really the
6328 nested FUNCTION_DECL. */
6331 set_save_expr_context (tree *tp,
6335 if (TREE_CODE (*tp) == SAVE_EXPR && !SAVE_EXPR_CONTEXT (*tp))
6336 SAVE_EXPR_CONTEXT (*tp) = (tree) data;
6337 /* Do not walk back into the SAVE_EXPR_CONTEXT; that will cause
6339 else if (DECL_P (*tp))
6345 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6346 then we are already in the process of generating RTL for another
6347 function. If can_defer_p is zero, we won't attempt to defer the
6348 generation of RTL. */
6351 c_expand_body_1 (tree fndecl, int nested_p)
6353 timevar_push (TV_EXPAND);
6357 /* Make sure that we will evaluate variable-sized types involved
6358 in our function's type. */
6359 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6360 /* Squirrel away our current state. */
6361 push_function_context ();
6364 /* Initialize the RTL code for the function. */
6365 current_function_decl = fndecl;
6366 input_location = DECL_SOURCE_LOCATION (fndecl);
6367 init_function_start (fndecl);
6369 /* This function is being processed in whole-function mode. */
6370 cfun->x_whole_function_mode_p = 1;
6372 /* Even though we're inside a function body, we still don't want to
6373 call expand_expr to calculate the size of a variable-sized array.
6374 We haven't necessarily assigned RTL to all variables yet, so it's
6375 not safe to try to expand expressions involving them. */
6376 immediate_size_expand = 0;
6377 cfun->x_dont_save_pending_sizes_p = 1;
6379 /* Set up parameters and prepare for return, for the function. */
6380 expand_function_start (fndecl, 0);
6382 /* If the function has a variably modified type, there may be
6383 SAVE_EXPRs in the parameter types. Their context must be set to
6384 refer to this function; they cannot be expanded in the containing
6386 if (decl_function_context (fndecl)
6387 && variably_modified_type_p (TREE_TYPE (fndecl)))
6388 walk_tree (&TREE_TYPE (fndecl), set_save_expr_context, fndecl,
6391 /* If this function is `main', emit a call to `__main'
6392 to run global initializers, etc. */
6393 if (DECL_NAME (fndecl)
6394 && MAIN_NAME_P (DECL_NAME (fndecl))
6395 && DECL_CONTEXT (fndecl) == NULL_TREE)
6396 expand_main_function ();
6398 /* Generate the RTL for this function. */
6399 expand_stmt (DECL_SAVED_TREE (fndecl));
6401 /* We hard-wired immediate_size_expand to zero above.
6402 expand_function_end will decrement this variable. So, we set the
6403 variable to one here, so that after the decrement it will remain
6405 immediate_size_expand = 1;
6407 /* Allow language dialects to perform special processing. */
6408 if (lang_expand_function_end)
6409 (*lang_expand_function_end) ();
6411 /* Generate rtl for function exit. */
6412 expand_function_end ();
6414 /* If this is a nested function, protect the local variables in the stack
6415 above us from being collected while we're compiling this function. */
6417 ggc_push_context ();
6419 /* Run the optimizers and output the assembler code for this function. */
6420 rest_of_compilation (fndecl);
6422 /* Undo the GC context switch. */
6426 /* With just -Wextra, complain only if function returns both with
6427 and without a value. */
6429 && current_function_returns_value
6430 && current_function_returns_null)
6431 warning ("this function may return with or without a value");
6433 /* If requested, warn about function definitions where the function will
6434 return a value (usually of some struct or union type) which itself will
6435 take up a lot of stack space. */
6437 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6439 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6441 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6442 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6443 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6446 const location_t *locus = &DECL_SOURCE_LOCATION (fndecl);
6447 unsigned int size_as_int
6448 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6450 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6451 warning ("%Hsize of return value of '%D' is %u bytes",
6452 locus, fndecl, size_as_int);
6454 warning ("%Hsize of return value of '%D' is larger than %wd bytes",
6455 locus, fndecl, larger_than_size);
6459 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6460 && ! flag_inline_trees)
6462 /* Stop pointing to the local nodes about to be freed.
6463 But DECL_INITIAL must remain nonzero so we know this
6464 was an actual function definition.
6465 For a nested function, this is done in c_pop_function_context.
6466 If rest_of_compilation set this to 0, leave it 0. */
6467 if (DECL_INITIAL (fndecl) != 0)
6468 DECL_INITIAL (fndecl) = error_mark_node;
6470 DECL_ARGUMENTS (fndecl) = 0;
6473 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6475 if (targetm.have_ctors_dtors)
6476 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6477 DEFAULT_INIT_PRIORITY);
6479 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6482 if (DECL_STATIC_DESTRUCTOR (fndecl))
6484 if (targetm.have_ctors_dtors)
6485 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6486 DEFAULT_INIT_PRIORITY);
6488 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6492 /* Return to the enclosing function. */
6493 pop_function_context ();
6494 timevar_pop (TV_EXPAND);
6497 /* Like c_expand_body_1 but only for unnested functions. */
6500 c_expand_body (tree fndecl)
6502 c_expand_body_1 (fndecl, 0);
6505 /* Check the declarations given in a for-loop for satisfying the C99
6508 check_for_loop_decls (void)
6514 /* If we get here, declarations have been used in a for loop without
6515 the C99 for loop scope. This doesn't make much sense, so don't
6517 error ("`for' loop initial declaration used outside C99 mode");
6520 /* C99 subclause 6.8.5 paragraph 3:
6522 [#3] The declaration part of a for statement shall only
6523 declare identifiers for objects having storage class auto or
6526 It isn't clear whether, in this sentence, "identifiers" binds to
6527 "shall only declare" or to "objects" - that is, whether all identifiers
6528 declared must be identifiers for objects, or whether the restriction
6529 only applies to those that are. (A question on this in comp.std.c
6530 in November 2000 received no answer.) We implement the strictest
6531 interpretation, to avoid creating an extension which later causes
6534 for (t = gettags (); t; t = TREE_CHAIN (t))
6536 if (TREE_PURPOSE (t) != 0)
6538 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6540 if (code == RECORD_TYPE)
6541 error ("`struct %s' declared in `for' loop initial declaration",
6542 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6543 else if (code == UNION_TYPE)
6544 error ("`union %s' declared in `for' loop initial declaration",
6545 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6547 error ("`enum %s' declared in `for' loop initial declaration",
6548 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6552 for (t = getdecls (); t; t = TREE_CHAIN (t))
6554 const location_t *locus = &DECL_SOURCE_LOCATION (t);
6555 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6556 error ("%Hdeclaration of non-variable '%D' in 'for' loop "
6557 "initial declaration", locus, t);
6558 else if (TREE_STATIC (t))
6559 error ("%Hdeclaration of static variable '%D' in 'for' loop "
6560 "initial declaration", locus, t);
6561 else if (DECL_EXTERNAL (t))
6562 error ("%Hdeclaration of 'extern' variable '%D' in 'for' loop "
6563 "initial declaration", locus, t);
6567 /* Save and restore the variables in this file and elsewhere
6568 that keep track of the progress of compilation of the current function.
6569 Used for nested functions. */
6571 struct language_function GTY(())
6573 struct c_language_function base;
6576 int returns_abnormally;
6577 int warn_about_return_type;
6579 struct c_scope *scope;
6582 /* Save and reinitialize the variables
6583 used during compilation of a C function. */
6586 c_push_function_context (struct function *f)
6588 struct language_function *p;
6589 p = ggc_alloc (sizeof (struct language_function));
6592 p->base.x_stmt_tree = c_stmt_tree;
6593 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6594 p->returns_value = current_function_returns_value;
6595 p->returns_null = current_function_returns_null;
6596 p->returns_abnormally = current_function_returns_abnormally;
6597 p->warn_about_return_type = warn_about_return_type;
6598 p->extern_inline = current_extern_inline;
6599 p->scope = current_scope;
6602 /* Restore the variables used during compilation of a C function. */
6605 c_pop_function_context (struct function *f)
6607 struct language_function *p = f->language;
6609 if (DECL_SAVED_INSNS (current_function_decl) == 0
6610 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6612 /* Stop pointing to the local nodes about to be freed. */
6613 /* But DECL_INITIAL must remain nonzero so we know this
6614 was an actual function definition. */
6615 DECL_INITIAL (current_function_decl) = error_mark_node;
6616 DECL_ARGUMENTS (current_function_decl) = 0;
6619 c_stmt_tree = p->base.x_stmt_tree;
6620 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6621 current_function_returns_value = p->returns_value;
6622 current_function_returns_null = p->returns_null;
6623 current_function_returns_abnormally = p->returns_abnormally;
6624 warn_about_return_type = p->warn_about_return_type;
6625 current_extern_inline = p->extern_inline;
6626 current_scope = p->scope;
6631 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6634 c_dup_lang_specific_decl (tree decl)
6636 struct lang_decl *ld;
6638 if (!DECL_LANG_SPECIFIC (decl))
6641 ld = ggc_alloc (sizeof (struct lang_decl));
6642 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6643 DECL_LANG_SPECIFIC (decl) = ld;
6646 /* The functions below are required for functionality of doing
6647 function at once processing in the C front end. Currently these
6648 functions are not called from anywhere in the C front end, but as
6649 these changes continue, that will change. */
6651 /* Returns nonzero if the current statement is a full expression,
6652 i.e. temporaries created during that statement should be destroyed
6653 at the end of the statement. */
6656 stmts_are_full_exprs_p (void)
6661 /* Returns the stmt_tree (if any) to which statements are currently
6662 being added. If there is no active statement-tree, NULL is
6666 current_stmt_tree (void)
6668 return &c_stmt_tree;
6671 /* Returns the stack of SCOPE_STMTs for the current function. */
6674 current_scope_stmt_stack (void)
6676 return &c_scope_stmt_stack;
6679 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6683 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6688 /* Dummy function in place of callback used by C++. */
6691 extract_interface_info (void)
6695 /* Return a new COMPOUND_STMT, after adding it to the current
6699 c_begin_compound_stmt (void)
6703 /* Create the COMPOUND_STMT. */
6704 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6709 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6713 c_expand_decl_stmt (tree t)
6715 tree decl = DECL_STMT_DECL (t);
6717 /* Expand nested functions. */
6718 if (TREE_CODE (decl) == FUNCTION_DECL
6719 && DECL_CONTEXT (decl) == current_function_decl
6720 && DECL_SAVED_TREE (decl))
6721 c_expand_body_1 (decl, 1);
6724 /* Return the global value of T as a symbol. */
6727 identifier_global_value (tree t)
6729 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6730 if (decl == 0 || C_DECL_FILE_SCOPE (decl))
6733 /* Shadowed by something else; find the true global value. */
6734 for (decl = global_scope->names; decl; decl = TREE_CHAIN (decl))
6735 if (DECL_NAME (decl) == t)
6738 /* Only local values for this decl. */
6742 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6743 otherwise the name is found in ridpointers from RID_INDEX. */
6746 record_builtin_type (enum rid rid_index, const char *name, tree type)
6750 id = ridpointers[(int) rid_index];
6752 id = get_identifier (name);
6753 pushdecl (build_decl (TYPE_DECL, id, type));
6756 /* Build the void_list_node (void_type_node having been created). */
6758 build_void_list_node (void)
6760 tree t = build_tree_list (NULL_TREE, void_type_node);
6764 /* Return something to represent absolute declarators containing a *.
6765 TARGET is the absolute declarator that the * contains.
6766 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6767 to apply to the pointer type, represented as identifiers, possible mixed
6770 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6771 if attributes are present) and whose type is the modifier list. */
6774 make_pointer_declarator (tree type_quals_attrs, tree target)
6777 tree itarget = target;
6778 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6779 if (attrs != NULL_TREE)
6780 itarget = tree_cons (attrs, target, NULL_TREE);
6781 return build1 (INDIRECT_REF, quals, itarget);
6784 /* A wrapper around lhd_set_decl_assembler_name that gives static
6785 variables their C names if they are at file scope and only one
6786 translation unit is being compiled, for backwards compatibility
6787 with certain bizzare assembler hacks (like crtstuff.c). */
6790 c_static_assembler_name (tree decl)
6792 if (num_in_fnames == 1
6793 && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6794 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6795 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6797 lhd_set_decl_assembler_name (decl);
6800 /* Hash and equality functions for link_hash_table: key off
6801 DECL_ASSEMBLER_NAME. */
6804 link_hash_hash (const void *x_p)
6807 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6811 link_hash_eq (const void *x1_p, const void *x2_p)
6813 tree x1 = (tree)x1_p;
6814 tree x2 = (tree)x2_p;
6815 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6818 /* Propagate information between definitions and uses between multiple
6819 translation units in TU_LIST based on linkage rules. */
6822 merge_translation_unit_decls (void)
6824 const tree tu_list = current_file_decl;
6827 htab_t link_hash_table;
6830 /* Create the BLOCK that poplevel would have created, but don't
6831 actually call poplevel since that's expensive. */
6832 block = make_node (BLOCK);
6833 BLOCK_VARS (block) = current_scope->names;
6834 TREE_USED (block) = 1;
6835 DECL_INITIAL (current_file_decl) = block;
6837 /* If only one translation unit seen, no copying necessary. */
6838 if (TREE_CHAIN (tu_list) == NULL_TREE)
6841 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6843 /* Enter any actual definitions into the hash table. */
6844 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6845 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6846 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6849 slot = htab_find_slot (link_hash_table, decl, INSERT);
6851 /* If we've already got a definition, work out which one is
6852 the real one, put it into the hash table, and make the
6853 other one DECL_EXTERNAL. This is important to avoid
6854 putting out two definitions of the same symbol in the
6858 tree old_decl = (tree) *slot;
6860 /* If this is weak or common or whatever, suppress it
6861 in favour of the other definition. */
6862 if (DECL_WEAK (decl))
6863 DECL_EXTERNAL (decl) = 1;
6864 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6865 DECL_EXTERNAL (old_decl) = 1;
6866 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6867 DECL_EXTERNAL (decl) = 1;
6868 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6869 DECL_EXTERNAL (old_decl) = 1;
6871 if (DECL_EXTERNAL (decl))
6873 DECL_INITIAL (decl) = NULL_TREE;
6874 DECL_COMMON (decl) = 0;
6875 DECL_ONE_ONLY (decl) = 0;
6876 DECL_WEAK (decl) = 0;
6878 else if (DECL_EXTERNAL (old_decl))
6880 DECL_INITIAL (old_decl) = NULL_TREE;
6881 DECL_COMMON (old_decl) = 0;
6882 DECL_ONE_ONLY (old_decl) = 0;
6883 DECL_WEAK (old_decl) = 0;
6888 error ("%Hredefinition of global '%D'",
6889 &DECL_SOURCE_LOCATION (decl), decl);
6890 error ("%H'%D' previously defined here",
6891 &DECL_SOURCE_LOCATION (old_decl), old_decl);
6898 /* Now insert the desired information from all the definitions
6899 into any plain declarations. */
6900 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6901 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6902 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6905 global_decl = htab_find (link_hash_table, decl);
6910 /* Print any appropriate error messages, and partially merge
6912 (void) duplicate_decls (decl, global_decl, true, true);
6915 htab_delete (link_hash_table);
6918 /* Perform final processing on file-scope data. */
6921 c_write_global_declarations(void)
6925 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6927 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6928 int len = list_length (globals);
6929 tree *vec = xmalloc (sizeof (tree) * len);
6933 /* Process the decls in reverse order--earliest first.
6934 Put them into VEC from back to front, then take out from front. */
6936 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6937 vec[len - i - 1] = decl;
6939 wrapup_global_declarations (vec, len);
6941 check_global_declarations (vec, len);
6948 /* Reset the parser's state in preparation for a new file. */
6951 c_reset_state (void)
6954 tree file_scope_decl;
6956 /* Pop the global scope. */
6957 if (current_scope != global_scope)
6958 current_scope = global_scope;
6959 file_scope_decl = current_file_decl;
6960 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6961 truly_local_externals = NULL_TREE;
6963 /* Start a new global binding level. */
6965 global_scope = current_scope;
6966 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6967 TREE_CHAIN (current_file_decl) = file_scope_decl;
6969 /* Reintroduce the global declarations. */
6970 for (link = builtin_decls; link; link = TREE_CHAIN (link))
6971 pushdecl (copy_node (link));
6974 #include "gt-c-decl.h"