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 binding_level 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 levels from
165 * the current one out to the global one.
168 struct binding_level 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 level, a list of shadowed outer-level definitions
184 to be restored when this level 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 level, a list of shadowed outer-level tag definitions
190 to be restored when this level 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 level (except not the global one),
196 a chain of BLOCK nodes for all the levels
197 that were entered and exited one level down. */
200 /* The scope containing this one. */
201 struct binding_level *outer;
203 /* The next outermost function scope. */
204 struct binding_level *outer_function;
206 /* True if we are currently filling this level 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 level regardless of all else. */
218 /* True means make a BLOCK if this level 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 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
233 /* The binding level currently in effect. */
235 static GTY(()) struct binding_level *current_binding_level;
237 /* A chain of binding_level structures awaiting reuse. */
239 static GTY((deletable (""))) struct binding_level *free_binding_level;
241 /* The innermost function scope. Ordinary (not explicitly declared)
242 labels, bindings to error_mark_node, and the lazily-created
243 bindings of __func__ and its friends get this scope. */
244 static GTY(()) struct binding_level *current_function_level;
246 /* The outermost binding level, for names of file scope.
247 This is created when the compiler is started and exists
248 through the entire run. */
250 static GTY(()) struct binding_level *global_binding_level;
252 /* True means unconditionally make a BLOCK for the next level pushed. */
254 static bool keep_next_level_flag;
256 /* True means make a BLOCK for the next level pushed if it has subblocks. */
258 static bool keep_next_if_subblocks;
260 /* Functions called automatically at the beginning and end of execution. */
262 tree static_ctors, static_dtors;
264 /* Forward declarations. */
266 static struct binding_level *make_binding_level (void);
267 static void pop_binding_level (void);
268 static int duplicate_decls (tree, tree, int, int);
269 static int redeclaration_error_message (tree, tree);
270 static tree make_label (tree, location_t);
271 static void bind_label (tree, tree, struct binding_level *);
272 static void implicit_decl_warning (tree);
273 static void storedecls (tree);
274 static void storetags (tree);
275 static tree lookup_tag (enum tree_code, tree, int);
276 static tree lookup_name_current_level (tree);
277 static tree grokdeclarator (tree, tree, enum decl_context, int);
278 static tree grokparms (tree, int);
279 static void layout_array_type (tree);
280 static tree c_make_fname_decl (tree, int);
281 static void c_expand_body_1 (tree, int);
282 static tree any_external_decl (tree);
283 static void record_external_decl (tree);
284 static void warn_if_shadowing (tree, tree);
285 static void clone_underlying_type (tree);
286 static void pushdecl_function_level (tree, tree);
287 static bool flexible_array_type_p (tree);
288 static hashval_t link_hash_hash (const void *);
289 static int link_hash_eq (const void *, const void *);
291 /* States indicating how grokdeclarator() should handle declspecs marked
292 with __attribute__((deprecated)). An object declared as
293 __attribute__((deprecated)) suppresses warnings of uses of other
296 enum deprecated_states {
301 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
304 c_print_identifier (FILE *file, tree node, int indent)
306 print_node (file, "symbol", IDENTIFIER_SYMBOL_VALUE (node), indent + 4);
307 print_node (file, "tag", IDENTIFIER_TAG_VALUE (node), indent + 4);
308 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
309 if (C_IS_RESERVED_WORD (node))
311 tree rid = ridpointers[C_RID_CODE (node)];
312 indent_to (file, indent + 4);
313 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
314 (void *) rid, IDENTIFIER_POINTER (rid));
318 /* Hook called at end of compilation to assume 1 elt
319 for a top-level tentative array defn that wasn't complete before. */
322 c_finish_incomplete_decl (tree decl)
324 if (TREE_CODE (decl) == VAR_DECL)
326 tree type = TREE_TYPE (decl);
327 if (type != error_mark_node
328 && TREE_CODE (type) == ARRAY_TYPE
329 && ! DECL_EXTERNAL (decl)
330 && TYPE_DOMAIN (type) == 0)
332 warning ("%Harray '%D' assumed to have one element",
333 &DECL_SOURCE_LOCATION (decl), decl);
335 complete_array_type (type, NULL_TREE, 1);
337 layout_decl (decl, 0);
342 /* Reuse or create a struct for this binding level. */
344 static struct binding_level *
345 make_binding_level (void)
347 struct binding_level *result;
348 if (free_binding_level)
350 result = free_binding_level;
351 free_binding_level = result->outer;
354 result = ggc_alloc_cleared (sizeof (struct binding_level));
359 /* Remove the topmost binding level from the stack and add it to the
360 free list, updating current_function_level if necessary. */
363 pop_binding_level (void)
365 struct binding_level *scope = current_binding_level;
367 current_binding_level = scope->outer;
368 if (scope->function_body)
369 current_function_level = scope->outer_function;
371 memset (scope, 0, sizeof (struct binding_level));
372 scope->outer = free_binding_level;
373 free_binding_level = scope;
376 /* Nonzero if we are currently in the global binding level. */
379 global_bindings_p (void)
381 return current_binding_level == global_binding_level;
385 keep_next_level (void)
387 keep_next_level_flag = true;
390 /* Identify this binding level as a level of parameters. */
393 declare_parm_level (void)
395 current_binding_level->parm_flag = true;
398 /* Nonzero if currently making parm declarations. */
401 in_parm_level_p (void)
403 return current_binding_level->parm_flag;
406 /* Enter a new binding level. */
409 pushlevel (int dummy ATTRIBUTE_UNUSED)
411 if (keep_next_if_subblocks)
413 /* This is the transition from the parameters to the top level
414 of the function body. These are the same scope
415 (C99 6.2.1p4,6) so we do not push another binding level.
417 XXX Note kludge - keep_next_if_subblocks is set only by
418 store_parm_decls, which in turn is called when and only
419 when we are about to encounter the opening curly brace for
420 the function body. */
421 current_binding_level->parm_flag = false;
422 current_binding_level->function_body = true;
423 current_binding_level->keep |= keep_next_level_flag;
424 current_binding_level->keep_if_subblocks = true;
425 current_binding_level->outer_function = current_function_level;
426 current_function_level = current_binding_level;
428 keep_next_level_flag = false;
429 keep_next_if_subblocks = false;
433 struct binding_level *newlevel = make_binding_level ();
435 newlevel->keep = keep_next_level_flag;
436 newlevel->outer = current_binding_level;
437 current_binding_level = newlevel;
438 keep_next_level_flag = false;
442 /* Exit a binding level.
443 Pop the level off, and restore the state of the identifier-decl mappings
444 that were in effect when this level was entered.
446 If KEEP is nonzero, this level had explicit declarations, so
447 and create a "block" (a BLOCK node) for the level
448 to record its declarations and subblocks for symbol table output.
450 If FUNCTIONBODY is nonzero, this level is the body of a function,
451 so create a block as if KEEP were set and also clear out all
454 If REVERSE is nonzero, reverse the order of decls before putting
455 them into the BLOCK. */
458 poplevel (int keep, int reverse, int functionbody)
463 tree decls = current_binding_level->names;
464 tree tags = current_binding_level->tags;
465 tree subblocks = current_binding_level->blocks;
467 functionbody |= current_binding_level->function_body;
469 if (keep == KEEP_MAYBE)
470 keep = (current_binding_level->names || current_binding_level->tags);
472 keep |= (current_binding_level->keep || functionbody
473 || (subblocks && current_binding_level->keep_if_subblocks));
475 /* We used to warn about unused variables in expand_end_bindings,
476 i.e. while generating RTL. But in function-at-a-time mode we may
477 choose to never expand a function at all (e.g. auto inlining), so
478 we do this explicitly now.
479 No warnings when the global scope is popped because the global
480 scope isn't popped for the last translation unit, so the warnings
481 are done in c_write_global_declaration. */
482 if (current_binding_level != global_binding_level)
483 warn_about_unused_variables (decls);
485 /* Clear out the name-meanings declared on this level.
486 Propagate TREE_ADDRESSABLE from nested functions to their
487 containing functions. */
488 for (link = decls; link; link = TREE_CHAIN (link))
490 if (TREE_CODE (link) == LABEL_DECL)
492 if (TREE_USED (link) && DECL_INITIAL (link) == 0)
494 error ("%Hlabel `%D' used but not defined",
495 &DECL_SOURCE_LOCATION (link), link);
496 /* Avoid crashing later. */
497 DECL_INITIAL (link) = error_mark_node;
499 else if (!TREE_USED (link) && warn_unused_label)
501 if (DECL_INITIAL (link) != 0)
502 warning ("%Hlabel `%D' defined but not used",
503 &DECL_SOURCE_LOCATION (link), link);
505 warning ("%Hlabel `%D' declared but not defined",
506 &DECL_SOURCE_LOCATION (link), link);
508 IDENTIFIER_LABEL_VALUE (DECL_NAME (link)) = 0;
510 else if (DECL_NAME (link) != 0)
512 if (DECL_EXTERNAL (link)
513 && current_binding_level != global_binding_level)
514 /* External decls stay in the symbol-value slot but are
516 C_DECL_INVISIBLE (link) = 1;
518 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (link)) = 0;
521 if (TREE_CODE (link) == FUNCTION_DECL
522 && ! TREE_ASM_WRITTEN (link)
523 && DECL_INITIAL (link) != 0
524 && TREE_ADDRESSABLE (link)
525 && DECL_ABSTRACT_ORIGIN (link) != 0
526 && DECL_ABSTRACT_ORIGIN (link) != link)
527 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (link)) = 1;
530 /* Clear out the tag-meanings declared on this level. */
531 for (link = tags; link; link = TREE_CHAIN (link))
532 if (TREE_PURPOSE (link))
533 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (link)) = 0;
535 /* Restore all name- and label-meanings of the outer levels
536 that were shadowed by this level. */
538 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
539 if (TREE_VALUE (link) && TREE_CODE (TREE_VALUE (link)) == LABEL_DECL)
540 IDENTIFIER_LABEL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
542 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
544 /* Restore all tag-meanings of the outer levels
545 that were shadowed by this level. */
547 for (link = current_binding_level->shadowed_tags; link;
548 link = TREE_CHAIN (link))
549 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
551 /* If this is the top level block of a function, remove all
552 PARM_DECLs from current_binding_level->names; they are already
553 stored in DECL_ARGUMENTS of cfun->decl in proper order, should
554 not be put in BLOCK_VARS, and furthermore reversing them will
555 cause trouble later. They are all together at the end of the
557 if (functionbody && decls)
559 if (TREE_CODE (decls) == PARM_DECL)
564 while (TREE_CHAIN (link)
565 && TREE_CODE (TREE_CHAIN (link)) != PARM_DECL)
566 link = TREE_CHAIN (link);
568 TREE_CHAIN (link) = 0;
572 /* Get the decls in the order they were written.
573 Usually current_binding_level->names is in reverse order.
574 But parameter decls were previously put in forward order. */
577 decls = nreverse (decls);
579 /* If there were any declarations or structure tags in that level,
580 or if this level is a function body,
581 create a BLOCK to record them for the life of this function. */
586 block = make_node (BLOCK);
587 BLOCK_VARS (block) = decls;
588 BLOCK_SUBBLOCKS (block) = subblocks;
589 TREE_USED (block) = 1;
592 /* In each subblock, record that this is its superior. */
594 for (link = subblocks; link; link = TREE_CHAIN (link))
595 BLOCK_SUPERCONTEXT (link) = block;
597 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
598 binding contour so that they point to the appropriate construct, i.e.
599 either to the current FUNCTION_DECL node, or else to the BLOCK node
602 Note that for tagged types whose scope is just the formal parameter
603 list for some function type specification, we can't properly set
604 their TYPE_CONTEXTs here, because we don't have a pointer to the
605 appropriate FUNCTION_TYPE node readily available to us. For those
606 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
607 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
608 node which will represent the "scope" for these "parameter list local"
611 decl = functionbody ? current_function_decl : block;
613 for (link = tags; link; link = TREE_CHAIN (link))
614 TYPE_CONTEXT (TREE_VALUE (link)) = decl;
616 /* Pop the current level, and free the structure for reuse. */
617 pop_binding_level ();
619 /* Dispose of the block that we just made inside some higher level. */
621 DECL_INITIAL (current_function_decl) = block;
622 else if (block && current_binding_level)
623 current_binding_level->blocks
624 = chainon (current_binding_level->blocks, block);
625 /* If we did not make a block for the level just exited,
626 any blocks made for inner levels
627 (since they cannot be recorded as subblocks in that level)
628 must be carried forward so they will later become subblocks
629 of something else. */
630 else if (! block && subblocks)
631 current_binding_level->blocks
632 = chainon (current_binding_level->blocks, subblocks);
637 /* Insert BLOCK at the end of the list of subblocks of the
638 current binding level. This is used when a BIND_EXPR is expanded,
639 to handle the BLOCK node inside the BIND_EXPR. */
642 insert_block (tree block)
644 TREE_USED (block) = 1;
645 current_binding_level->blocks
646 = chainon (current_binding_level->blocks, block);
649 /* Set the BLOCK node for the innermost scope (the one we are
650 currently in). The RTL expansion machinery requires us to provide
651 this hook, but it is not useful in function-at-a-time mode. */
654 set_block (tree block ATTRIBUTE_UNUSED)
658 /* Push a definition or a declaration of struct, union or enum tag "name".
659 "type" should be the type node.
660 We assume that the tag "name" is not already defined.
662 Note that the definition may really be just a forward reference.
663 In that case, the TYPE_SIZE will be zero. */
666 pushtag (tree name, tree type)
668 struct binding_level *b = current_binding_level;
672 /* Record the identifier as the type's name if it has none. */
674 if (TYPE_NAME (type) == 0)
675 TYPE_NAME (type) = name;
677 if (IDENTIFIER_TAG_VALUE (name))
678 b->shadowed_tags = tree_cons (name, IDENTIFIER_TAG_VALUE (name),
680 IDENTIFIER_TAG_VALUE (name) = type;
683 b->tags = tree_cons (name, type, b->tags);
685 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
686 tagged type we just added to the current binding level. This fake
687 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
688 to output a representation of a tagged type, and it also gives
689 us a convenient place to record the "scope start" address for the
692 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
694 /* An approximation for now, so we can tell this is a function-scope tag.
695 This will be updated in poplevel. */
696 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
699 /* Handle when a new declaration NEWDECL
700 has the same name as an old one OLDDECL
701 in the same binding contour.
702 Prints an error message if appropriate.
704 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
707 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
708 and OLDDECL is in an outer binding level and should thus not be changed. */
711 duplicate_decls (tree newdecl, tree olddecl, int different_binding_level,
714 int comptype_flags = (different_tu ? COMPARE_DIFFERENT_TU
716 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl),
718 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
719 && DECL_INITIAL (newdecl) != 0);
720 tree oldtype = TREE_TYPE (olddecl);
721 tree newtype = TREE_TYPE (newdecl);
724 if (DECL_P (olddecl))
726 if (TREE_CODE (newdecl) == FUNCTION_DECL
727 && TREE_CODE (olddecl) == FUNCTION_DECL
728 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
730 if (DECL_DECLARED_INLINE_P (newdecl)
731 && DECL_UNINLINABLE (newdecl)
732 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
733 /* Already warned elsewhere. */;
734 else if (DECL_DECLARED_INLINE_P (olddecl)
735 && DECL_UNINLINABLE (olddecl)
736 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
737 /* Already warned. */;
738 else if (DECL_DECLARED_INLINE_P (newdecl)
739 && ! DECL_DECLARED_INLINE_P (olddecl)
740 && DECL_UNINLINABLE (olddecl)
741 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
743 warning ("%Hfunction '%D' redeclared as inline",
744 &DECL_SOURCE_LOCATION (newdecl), newdecl);
745 warning ("%Hprevious declaration of function '%D' "
746 "with attribute noinline",
747 &DECL_SOURCE_LOCATION (olddecl), olddecl);
749 else if (DECL_DECLARED_INLINE_P (olddecl)
750 && DECL_UNINLINABLE (newdecl)
751 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
753 warning ("%Hfunction '%D' redeclared with attribute noinline",
754 &DECL_SOURCE_LOCATION (newdecl), newdecl);
755 warning ("%Hprevious declaration of function '%D' was inline",
756 &DECL_SOURCE_LOCATION (olddecl), olddecl);
760 DECL_ATTRIBUTES (newdecl)
761 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
764 if (TREE_CODE (newtype) == ERROR_MARK
765 || TREE_CODE (oldtype) == ERROR_MARK)
768 /* New decl is completely inconsistent with the old one =>
769 tell caller to replace the old one.
770 This is always an error except in the case of shadowing a builtin. */
771 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
773 if (TREE_CODE (olddecl) == FUNCTION_DECL
774 && DECL_BUILT_IN (olddecl))
776 /* If you declare a built-in or predefined function name as static,
777 the old definition is overridden,
778 but optionally warn this was a bad choice of name. */
779 if (!TREE_PUBLIC (newdecl))
782 warning ("%Hshadowing built-in function '%D'",
783 &DECL_SOURCE_LOCATION (newdecl), newdecl);
786 warning ("%Hbuilt-in function '%D' declared as non-function",
787 &DECL_SOURCE_LOCATION (newdecl), newdecl);
791 error ("%H'%D' redeclared as different kind of symbol",
792 &DECL_SOURCE_LOCATION (newdecl), newdecl);
793 error ("%Hprevious declaration of '%D'",
794 &DECL_SOURCE_LOCATION (olddecl), olddecl);
800 /* For real parm decl following a forward decl, return 1 so old decl
801 will be reused. Only allow this to happen once. */
802 if (types_match && TREE_CODE (newdecl) == PARM_DECL
803 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
805 TREE_ASM_WRITTEN (olddecl) = 0;
809 /* The new declaration is the same kind of object as the old one.
810 The declarations may partially match. Print warnings if they don't
811 match enough. Ultimately, copy most of the information from the new
812 decl to the old one, and keep using the old one. */
814 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
816 /* A function declaration for a built-in function. */
817 if (!TREE_PUBLIC (newdecl))
819 /* If you declare a built-in function name as static, the
820 built-in definition is overridden,
821 but optionally warn this was a bad choice of name. */
823 warning ("%Hshadowing built-in function '%D'",
824 &DECL_SOURCE_LOCATION (newdecl), newdecl);
825 /* Discard the old built-in function. */
828 else if (!types_match)
830 /* Accept the return type of the new declaration if same modes. */
831 tree oldreturntype = TREE_TYPE (oldtype);
832 tree newreturntype = TREE_TYPE (newtype);
834 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
836 /* Function types may be shared, so we can't just modify
837 the return type of olddecl's function type. */
839 = build_function_type (newreturntype,
840 TYPE_ARG_TYPES (oldtype));
841 trytype = build_type_attribute_variant (trytype,
842 TYPE_ATTRIBUTES (oldtype));
844 types_match = comptypes (newtype, trytype, comptype_flags);
848 /* Accept harmless mismatch in first argument type also.
849 This is for the ffs and fprintf builtins. */
850 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
851 && TYPE_ARG_TYPES (oldtype) != 0
852 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
853 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
854 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
855 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
857 /* Function types may be shared, so we can't just modify
858 the return type of olddecl's function type. */
860 = build_function_type (TREE_TYPE (oldtype),
861 tree_cons (NULL_TREE,
862 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
863 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
864 trytype = build_type_attribute_variant (trytype,
865 TYPE_ATTRIBUTES (oldtype));
867 types_match = comptypes (newtype, trytype, comptype_flags);
871 if (! different_binding_level)
872 TREE_TYPE (olddecl) = oldtype;
874 else if (TYPE_ARG_TYPES (oldtype) == NULL
875 && TYPE_ARG_TYPES (newtype) != NULL)
877 /* For bcmp, bzero, fputs the builtin type has arguments not
878 specified. Use the ones from the prototype so that type checking
881 = build_function_type (TREE_TYPE (oldtype),
882 TYPE_ARG_TYPES (newtype));
883 trytype = build_type_attribute_variant (trytype,
884 TYPE_ATTRIBUTES (oldtype));
887 if (! different_binding_level)
888 TREE_TYPE (olddecl) = oldtype;
892 /* If types don't match for a built-in, throw away the built-in. */
893 warning ("%Hconflicting types for built-in function '%D'",
894 &DECL_SOURCE_LOCATION (newdecl), newdecl);
898 else if (TREE_CODE (olddecl) == FUNCTION_DECL
899 && DECL_SOURCE_LINE (olddecl) == 0)
901 /* A function declaration for a predeclared function
902 that isn't actually built in. */
903 if (!TREE_PUBLIC (newdecl))
905 /* If you declare it as static, the
906 default definition is overridden. */
909 else if (!types_match)
911 /* If the types don't match, preserve volatility indication.
912 Later on, we will discard everything else about the
913 default declaration. */
914 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
917 /* Permit char *foo () to match void *foo (...) if not pedantic,
918 if one of them came from a system header file. */
919 else if (!types_match
920 && TREE_CODE (olddecl) == FUNCTION_DECL
921 && TREE_CODE (newdecl) == FUNCTION_DECL
922 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
923 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
924 && (DECL_IN_SYSTEM_HEADER (olddecl)
925 || DECL_IN_SYSTEM_HEADER (newdecl))
926 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
927 && TYPE_ARG_TYPES (oldtype) == 0
928 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
929 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
931 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
932 && TYPE_ARG_TYPES (newtype) == 0
933 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
934 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
937 pedwarn ("%Hconflicting types for '%D'",
938 &DECL_SOURCE_LOCATION (newdecl), newdecl);
939 /* Make sure we keep void * as ret type, not char *. */
940 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
941 TREE_TYPE (newdecl) = newtype = oldtype;
943 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
944 we will come back here again. */
945 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
947 /* Permit void foo (...) to match int foo (...) if the latter is the
948 definition and implicit int was used. See c-torture/compile/920625-2.c. */
949 else if (!types_match && new_is_definition
950 && TREE_CODE (olddecl) == FUNCTION_DECL
951 && TREE_CODE (newdecl) == FUNCTION_DECL
952 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
953 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
954 && C_FUNCTION_IMPLICIT_INT (newdecl))
956 pedwarn ("%Hconflicting types for '%D'",
957 &DECL_SOURCE_LOCATION (newdecl), newdecl);
958 /* Make sure we keep void as the return type. */
959 TREE_TYPE (newdecl) = newtype = oldtype;
960 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
962 else if (!types_match
963 /* Permit char *foo (int, ...); followed by char *foo ();
965 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
967 /* Return types must still match. */
968 && comptypes (TREE_TYPE (oldtype),
969 TREE_TYPE (newtype), comptype_flags)
970 && TYPE_ARG_TYPES (newtype) == 0))
972 error ("%Hconflicting types for '%D'",
973 &DECL_SOURCE_LOCATION (newdecl), newdecl);
974 /* Check for function type mismatch
975 involving an empty arglist vs a nonempty one. */
976 if (TREE_CODE (olddecl) == FUNCTION_DECL
977 && comptypes (TREE_TYPE (oldtype),
978 TREE_TYPE (newtype), comptype_flags)
979 && ((TYPE_ARG_TYPES (oldtype) == 0
980 && DECL_INITIAL (olddecl) == 0)
982 (TYPE_ARG_TYPES (newtype) == 0
983 && DECL_INITIAL (newdecl) == 0)))
985 /* Classify the problem further. */
986 tree t = TYPE_ARG_TYPES (oldtype);
988 t = TYPE_ARG_TYPES (newtype);
989 for (; t; t = TREE_CHAIN (t))
991 tree type = TREE_VALUE (t);
993 if (TREE_CHAIN (t) == 0
994 && TYPE_MAIN_VARIANT (type) != void_type_node)
996 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1000 if (c_type_promotes_to (type) != type)
1002 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1007 if (C_DECL_IMPLICIT (olddecl))
1008 error ("%Hprevious implicit declaration of '%D'",
1009 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1011 error ("%Hprevious declaration of '%D'",
1012 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1014 /* This is safer because the initializer might contain references
1015 to variables that were declared between olddecl and newdecl. This
1016 will make the initializer invalid for olddecl in case it gets
1017 assigned to olddecl below. */
1018 if (TREE_CODE (newdecl) == VAR_DECL)
1019 DECL_INITIAL (newdecl) = 0;
1021 /* TLS cannot follow non-TLS declaration. */
1022 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1023 && !DECL_THREAD_LOCAL (olddecl) && DECL_THREAD_LOCAL (newdecl))
1025 error ("%Hthread-local declaration of '%D' follows non thread-local "
1026 "declaration", &DECL_SOURCE_LOCATION (newdecl), newdecl);
1027 error ("%Hprevious declaration of '%D'",
1028 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1030 /* non-TLS declaration cannot follow TLS declaration. */
1031 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1032 && DECL_THREAD_LOCAL (olddecl) && !DECL_THREAD_LOCAL (newdecl))
1034 error ("%Hnon thread-local declaration of '%D' follows "
1035 "thread-local declaration",
1036 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1037 error ("%Hprevious declaration of '%D'",
1038 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1042 errmsg = redeclaration_error_message (newdecl, olddecl);
1045 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1049 error ("%Hredefinition of '%D'", locus, newdecl);
1052 error ("%Hredeclaration of '%D'", locus, newdecl);
1055 error ("%Hconflicting declarations of '%D'", locus, newdecl);
1061 locus = &DECL_SOURCE_LOCATION (olddecl);
1062 if (DECL_INITIAL (olddecl)
1063 && current_binding_level == global_binding_level)
1064 error ("%H'%D' previously defined here", locus, olddecl);
1066 error ("%H'%D' previously declared here", locus, olddecl);
1069 else if (TREE_CODE (newdecl) == TYPE_DECL
1070 && (DECL_IN_SYSTEM_HEADER (olddecl)
1071 || DECL_IN_SYSTEM_HEADER (newdecl)))
1073 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1074 warning ("%Hredefinition of '%D'", locus, newdecl);
1075 locus = &DECL_SOURCE_LOCATION (olddecl);
1076 if (DECL_INITIAL (olddecl)
1077 && current_binding_level == global_binding_level)
1078 warning ("%H'%D' previously defined here", locus, olddecl);
1080 warning ("%H'%D' previously declared here", locus, olddecl);
1082 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1083 && DECL_INITIAL (olddecl) != 0
1084 && TYPE_ARG_TYPES (oldtype) == 0
1085 && TYPE_ARG_TYPES (newtype) != 0
1086 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1090 /* Prototype decl follows defn w/o prototype. */
1092 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1093 type = TYPE_ARG_TYPES (newtype),
1096 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1098 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1099 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1101 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1102 warning ("%Hprototype for '%D' follows", locus, newdecl);
1103 locus = &DECL_SOURCE_LOCATION (olddecl);
1104 warning ("%Hnon-prototype definition here", locus);
1107 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1108 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1110 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1111 error ("%Hprototype for '%D' follows and number of "
1112 "arguments doesn't match", locus, newdecl);
1113 locus = &DECL_SOURCE_LOCATION (olddecl);
1114 error ("%Hnon-prototype definition here", locus);
1118 /* Type for passing arg must be consistent
1119 with that declared for the arg. */
1120 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type),
1123 const location_t *locus = &DECL_SOURCE_LOCATION (newdecl);
1124 error ("%Hprototype for '%D' follows and argument %d "
1125 "doesn't match", locus, newdecl, nargs);
1126 locus = &DECL_SOURCE_LOCATION (olddecl);
1127 error ("%Hnon-prototype definition here", locus);
1133 /* Warn about mismatches in various flags. */
1136 /* Warn if function is now inline
1137 but was previously declared not inline and has been called. */
1138 if (TREE_CODE (olddecl) == FUNCTION_DECL
1139 && ! DECL_DECLARED_INLINE_P (olddecl)
1140 && DECL_DECLARED_INLINE_P (newdecl)
1141 && TREE_USED (olddecl))
1142 warning ("%H'%D' declared inline after being called",
1143 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1144 if (TREE_CODE (olddecl) == FUNCTION_DECL
1145 && ! DECL_DECLARED_INLINE_P (olddecl)
1146 && DECL_DECLARED_INLINE_P (newdecl)
1147 && DECL_INITIAL (olddecl) != 0)
1148 warning ("%H'%D' declared inline after its definition",
1149 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1151 /* If pedantic, warn when static declaration follows a non-static
1152 declaration. Otherwise, do so only for functions. */
1153 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1154 && TREE_PUBLIC (olddecl)
1155 && !TREE_PUBLIC (newdecl))
1156 warning ("%Hstatic declaration for '%D' follows non-static",
1157 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1159 /* If warn_traditional, warn when a non-static function
1160 declaration follows a static one. */
1161 if (warn_traditional && !in_system_header
1162 && TREE_CODE (olddecl) == FUNCTION_DECL
1163 && !TREE_PUBLIC (olddecl)
1164 && TREE_PUBLIC (newdecl))
1165 warning ("%Hnon-static declaration for '%D' follows static",
1166 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1168 /* Warn when const declaration follows a non-const
1169 declaration, but not for functions. */
1170 if (TREE_CODE (olddecl) != FUNCTION_DECL
1171 && !TREE_READONLY (olddecl)
1172 && TREE_READONLY (newdecl))
1173 warning ("%Hconst declaration for '%D' follows non-const",
1174 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1175 /* These bits are logically part of the type, for variables.
1176 But not for functions
1177 (where qualifiers are not valid ANSI anyway). */
1178 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1179 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1180 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1181 pedwarn ("%Htype qualifiers for '%D' conflict with previous "
1182 "declaration", &DECL_SOURCE_LOCATION (newdecl), newdecl);
1186 /* Optionally warn about more than one declaration for the same name. */
1187 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1188 /* Don't warn about a function declaration
1189 followed by a definition. */
1190 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1191 && DECL_INITIAL (olddecl) == 0)
1192 /* Don't warn about extern decl followed by (tentative) definition. */
1193 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1195 warning ("%Hredundant redeclaration of '%D' in same scope",
1196 &DECL_SOURCE_LOCATION (newdecl), newdecl);
1197 warning ("%Hprevious declaration of '%D'",
1198 &DECL_SOURCE_LOCATION (olddecl), olddecl);
1201 /* Copy all the DECL_... slots specified in the new decl
1202 except for any that we copy here from the old type.
1204 Past this point, we don't change OLDTYPE and NEWTYPE
1205 even if we change the types of NEWDECL and OLDDECL. */
1209 /* When copying info to olddecl, we store into write_olddecl
1210 instead. This allows us to avoid modifying olddecl when
1211 different_binding_level is true. */
1212 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1214 /* Merge the data types specified in the two decls. */
1215 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1217 if (different_binding_level)
1219 if (TYPE_ARG_TYPES (oldtype) != 0
1220 && TYPE_ARG_TYPES (newtype) == 0)
1221 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1224 = build_type_attribute_variant
1226 merge_attributes (TYPE_ATTRIBUTES (newtype),
1227 TYPE_ATTRIBUTES (oldtype)));
1231 = TREE_TYPE (olddecl)
1232 = common_type (newtype, oldtype);
1235 /* Lay the type out, unless already done. */
1236 if (oldtype != TREE_TYPE (newdecl))
1238 if (TREE_TYPE (newdecl) != error_mark_node)
1239 layout_type (TREE_TYPE (newdecl));
1240 if (TREE_CODE (newdecl) != FUNCTION_DECL
1241 && TREE_CODE (newdecl) != TYPE_DECL
1242 && TREE_CODE (newdecl) != CONST_DECL)
1243 layout_decl (newdecl, 0);
1247 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1248 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1249 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1250 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1251 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1252 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1254 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1255 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1259 /* Keep the old rtl since we can safely use it. */
1260 COPY_DECL_RTL (olddecl, newdecl);
1262 /* Merge the type qualifiers. */
1263 if (TREE_READONLY (newdecl))
1264 TREE_READONLY (write_olddecl) = 1;
1266 if (TREE_THIS_VOLATILE (newdecl))
1268 TREE_THIS_VOLATILE (write_olddecl) = 1;
1269 if (TREE_CODE (newdecl) == VAR_DECL
1270 /* If an automatic variable is re-declared in the same
1271 function scope, but the old declaration was not
1272 volatile, make_var_volatile() would crash because the
1273 variable would have been assigned to a pseudo, not a
1274 MEM. Since this duplicate declaration is invalid
1275 anyway, we just skip the call. */
1277 make_var_volatile (newdecl);
1280 /* Keep source location of definition rather than declaration. */
1281 /* When called with different_binding_level set, keep the old
1282 information so that meaningful diagnostics can be given. */
1283 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1284 && ! different_binding_level)
1286 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1287 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1290 /* Merge the unused-warning information. */
1291 if (DECL_IN_SYSTEM_HEADER (olddecl))
1292 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1293 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1294 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1296 /* Merge the initialization information. */
1297 /* When called with different_binding_level set, don't copy over
1298 DECL_INITIAL, so that we don't accidentally change function
1299 declarations into function definitions. */
1300 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1301 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1303 /* Merge the section attribute.
1304 We want to issue an error if the sections conflict but that must be
1305 done later in decl_attributes since we are called before attributes
1307 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1308 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1310 /* Copy the assembler name.
1311 Currently, it can only be defined in the prototype. */
1312 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1314 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1316 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1317 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1318 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1319 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1320 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1321 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1322 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1323 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1324 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1327 /* If cannot merge, then use the new type and qualifiers,
1328 and don't preserve the old rtl. */
1329 else if (! different_binding_level)
1331 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1332 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1333 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1334 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1337 /* Merge the storage class information. */
1338 merge_weak (newdecl, olddecl);
1340 /* For functions, static overrides non-static. */
1341 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1343 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1344 /* This is since we don't automatically
1345 copy the attributes of NEWDECL into OLDDECL. */
1346 /* No need to worry about different_binding_level here because
1347 then TREE_PUBLIC (newdecl) was true. */
1348 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1349 /* If this clears `static', clear it in the identifier too. */
1350 if (! TREE_PUBLIC (olddecl))
1351 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1353 if (DECL_EXTERNAL (newdecl))
1355 if (! different_binding_level || different_tu)
1357 /* Don't mess with these flags on local externs; they remain
1358 external even if there's a declaration at file scope which
1360 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1361 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1363 /* An extern decl does not override previous storage class. */
1364 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1365 if (! DECL_EXTERNAL (newdecl))
1367 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1368 /* If we have two non-EXTERNAL file-scope decls that are
1369 the same, only one of them should be written out. */
1371 TREE_ASM_WRITTEN (newdecl) = 1;
1376 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1377 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1380 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1382 /* If we're redefining a function previously defined as extern
1383 inline, make sure we emit debug info for the inline before we
1384 throw it away, in case it was inlined into a function that hasn't
1385 been written out yet. */
1386 if (new_is_definition && DECL_INITIAL (olddecl))
1388 if (TREE_USED (olddecl))
1389 (*debug_hooks->outlining_inline_function) (olddecl);
1391 /* The new defn must not be inline. */
1392 DECL_INLINE (newdecl) = 0;
1393 DECL_UNINLINABLE (newdecl) = 1;
1397 /* If either decl says `inline', this fn is inline,
1398 unless its definition was passed already. */
1399 if (DECL_DECLARED_INLINE_P (newdecl)
1400 || DECL_DECLARED_INLINE_P (olddecl))
1401 DECL_DECLARED_INLINE_P (newdecl) = 1;
1403 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1404 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1407 if (DECL_BUILT_IN (olddecl))
1409 /* Get rid of any built-in function if new arg types don't match it
1410 or if we have a function definition. */
1411 if (! types_match || new_is_definition)
1413 if (! different_binding_level)
1415 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1416 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1421 /* If redeclaring a builtin function, and not a definition,
1422 it stays built in. */
1423 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1424 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1428 /* Also preserve various other info from the definition. */
1429 if (! new_is_definition)
1431 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1432 /* When called with different_binding_level set, don't copy over
1433 DECL_INITIAL, so that we don't accidentally change function
1434 declarations into function definitions. */
1435 if (! different_binding_level)
1436 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1437 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1438 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1439 DECL_ESTIMATED_INSNS (newdecl) = DECL_ESTIMATED_INSNS (olddecl);
1440 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1442 /* Set DECL_INLINE on the declaration if we've got a body
1443 from which to instantiate. */
1444 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1446 DECL_INLINE (newdecl) = 1;
1447 DECL_ABSTRACT_ORIGIN (newdecl)
1448 = (different_binding_level
1449 ? DECL_ORIGIN (olddecl)
1450 : DECL_ABSTRACT_ORIGIN (olddecl));
1455 /* If a previous declaration said inline, mark the
1456 definition as inlinable. */
1457 if (DECL_DECLARED_INLINE_P (newdecl)
1458 && ! DECL_UNINLINABLE (newdecl))
1459 DECL_INLINE (newdecl) = 1;
1462 if (different_binding_level)
1465 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1466 But preserve OLDDECL's DECL_UID. */
1468 unsigned olddecl_uid = DECL_UID (olddecl);
1470 memcpy ((char *) olddecl + sizeof (struct tree_common),
1471 (char *) newdecl + sizeof (struct tree_common),
1472 sizeof (struct tree_decl) - sizeof (struct tree_common));
1473 DECL_UID (olddecl) = olddecl_uid;
1476 /* NEWDECL contains the merged attribute lists.
1477 Update OLDDECL to be the same. */
1478 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1480 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1481 so that encode_section_info has a chance to look at the new decl
1482 flags and attributes. */
1483 if (DECL_RTL_SET_P (olddecl)
1484 && (TREE_CODE (olddecl) == FUNCTION_DECL
1485 || (TREE_CODE (olddecl) == VAR_DECL
1486 && TREE_STATIC (olddecl))))
1487 make_decl_rtl (olddecl, NULL);
1492 /* Return any external DECL associated with ID, whether or not it is
1493 currently in scope. */
1496 any_external_decl (tree id)
1498 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1501 if (decl == 0 || TREE_CODE (decl) == ERROR_MARK)
1503 else if (TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1506 t = purpose_member (id, truly_local_externals);
1508 return TREE_VALUE (t);
1513 /* Record an external decl DECL. This only does something if a
1514 shadowing decl already exists. */
1516 record_external_decl (tree decl)
1518 tree name = DECL_NAME (decl);
1519 if (!IDENTIFIER_SYMBOL_VALUE (name))
1522 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1525 /* Check whether decl-node X shadows an existing declaration.
1526 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1527 which might be a NULL_TREE. */
1529 warn_if_shadowing (tree x, tree old)
1533 /* Nothing to shadow? */
1535 /* Shadow warnings not wanted? */
1537 /* No shadow warnings for internally generated vars. */
1538 || DECL_SOURCE_LINE (x) == 0
1539 /* No shadow warnings for vars made for inlining. */
1540 || DECL_FROM_INLINE (x)
1541 /* Don't warn about the parm names in function declarator
1542 within a function declarator.
1543 It would be nice to avoid warning in any function
1544 declarator in a declaration, as opposed to a definition,
1545 but there is no way to tell it's not a definition. */
1546 || (TREE_CODE (x) == PARM_DECL
1547 && current_binding_level->outer->parm_flag))
1550 name = IDENTIFIER_POINTER (DECL_NAME (x));
1552 if (TREE_CODE (old) == PARM_DECL)
1553 shadow_warning (SW_PARAM, name, old);
1554 else if (C_DECL_FILE_SCOPE (old))
1555 shadow_warning (SW_GLOBAL, name, old);
1557 shadow_warning (SW_LOCAL, name, old);
1561 /* Subroutine of pushdecl.
1563 X is a TYPE_DECL for a typedef statement. Create a brand new
1564 ..._TYPE node (which will be just a variant of the existing
1565 ..._TYPE node with identical properties) and then install X
1566 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1568 The whole point here is to end up with a situation where each
1569 and every ..._TYPE node the compiler creates will be uniquely
1570 associated with AT MOST one node representing a typedef name.
1571 This way, even though the compiler substitutes corresponding
1572 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1573 early on, later parts of the compiler can always do the reverse
1574 translation and get back the corresponding typedef name. For
1577 typedef struct S MY_TYPE;
1580 Later parts of the compiler might only know that `object' was of
1581 type `struct S' if it were not for code just below. With this
1582 code however, later parts of the compiler see something like:
1584 struct S' == struct S
1585 typedef struct S' MY_TYPE;
1588 And they can then deduce (from the node for type struct S') that
1589 the original object declaration was:
1593 Being able to do this is important for proper support of protoize,
1594 and also for generating precise symbolic debugging information
1595 which takes full account of the programmer's (typedef) vocabulary.
1597 Obviously, we don't want to generate a duplicate ..._TYPE node if
1598 the TYPE_DECL node that we are now processing really represents a
1599 standard built-in type.
1601 Since all standard types are effectively declared at line zero
1602 in the source file, we can easily check to see if we are working
1603 on a standard type by checking the current value of lineno. */
1606 clone_underlying_type (tree x)
1608 if (DECL_SOURCE_LINE (x) == 0)
1610 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1611 TYPE_NAME (TREE_TYPE (x)) = x;
1613 else if (TREE_TYPE (x) != error_mark_node
1614 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1616 tree tt = TREE_TYPE (x);
1617 DECL_ORIGINAL_TYPE (x) = tt;
1618 tt = build_type_copy (tt);
1620 TREE_USED (tt) = TREE_USED (x);
1625 /* Record a decl-node X as belonging to the current lexical scope.
1626 Check for errors (such as an incompatible declaration for the same
1627 name already seen in the same scope).
1629 Returns either X or an old decl for the same name.
1630 If an old decl is returned, it may have been smashed
1631 to agree with what X says. */
1636 tree name = DECL_NAME (x);
1637 struct binding_level *scope = current_binding_level;
1639 #ifdef ENABLE_CHECKING
1640 if (error_mark_node == 0)
1641 /* Called too early. */
1645 /* Functions need the lang_decl data. */
1646 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1647 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1649 /* A local extern declaration for a function doesn't constitute nesting.
1650 A local auto declaration does, since it's a forward decl
1651 for a nested function coming later. */
1652 if (current_function_decl == NULL
1653 || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1654 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
1655 DECL_CONTEXT (x) = current_file_decl;
1657 DECL_CONTEXT (x) = current_function_decl;
1663 if (warn_nested_externs
1664 && scope != global_binding_level
1665 && DECL_EXTERNAL (x)
1666 && !DECL_IN_SYSTEM_HEADER (x))
1667 warning ("nested extern declaration of `%s'",
1668 IDENTIFIER_POINTER (name));
1670 old = lookup_name_current_level (name);
1671 if (old && duplicate_decls (x, old, 0, false))
1673 if (DECL_EXTERNAL (x) || scope == global_binding_level)
1675 /* Find and check against a previous, not-in-scope, external
1676 decl for this identifier. (C99 s???: If two declarations
1677 with external linkage, referring to the same object, have
1678 incompatible types, the behavior is undefined). */
1679 tree ext = any_external_decl (name);
1682 if (duplicate_decls (x, ext, scope != global_binding_level,
1684 x = copy_node (ext);
1687 record_external_decl (x);
1690 if (TREE_CODE (x) == TYPE_DECL)
1691 clone_underlying_type (x);
1693 /* If storing a local value, there may already be one
1694 (inherited). If so, record it for restoration when this
1695 binding level ends. Take care not to do this if we are
1696 replacing an older decl in the same binding level (i.e.
1697 duplicate_decls returned false, above). */
1698 if (scope != global_binding_level
1699 && IDENTIFIER_SYMBOL_VALUE (name)
1700 && IDENTIFIER_SYMBOL_VALUE (name) != old)
1702 warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
1703 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1707 /* Install the new declaration in the requested binding level. */
1708 IDENTIFIER_SYMBOL_VALUE (name) = x;
1709 C_DECL_INVISIBLE (x) = 0;
1711 /* Keep list of variables in this level with incomplete type.
1712 If the input is erroneous, we can have error_mark in the type
1713 slot (e.g. "f(void a, ...)") - that doesn't count as an
1715 if (TREE_TYPE (x) != error_mark_node
1716 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1718 tree element = TREE_TYPE (x);
1720 while (TREE_CODE (element) == ARRAY_TYPE)
1721 element = TREE_TYPE (element);
1722 if (TREE_CODE (element) == RECORD_TYPE
1723 || TREE_CODE (element) == UNION_TYPE)
1724 scope->incomplete_list = tree_cons (NULL_TREE, x,
1725 scope->incomplete_list);
1729 /* Put decls on list in reverse order.
1730 We will reverse them later if necessary. */
1731 TREE_CHAIN (x) = scope->names;
1737 /* Record X as belonging to the global scope (C99 "file scope").
1738 This is used only internally by the Objective-C front end,
1739 and is limited to its needs. It will hork if there is _any_
1740 visible binding for X (not just a global one). */
1742 pushdecl_top_level (tree x)
1746 if (TREE_CODE (x) != VAR_DECL)
1749 name = DECL_NAME (x);
1750 old = IDENTIFIER_SYMBOL_VALUE (name);
1754 if (DECL_CONTEXT (old))
1757 if (!duplicate_decls (x, old, 0, false))
1763 DECL_CONTEXT (x) = current_file_decl;
1764 IDENTIFIER_SYMBOL_VALUE (name) = x;
1765 TREE_CHAIN (x) = global_binding_level->names;
1766 global_binding_level->names = x;
1770 /* Record X as belonging to the outermost scope of the current
1771 function. This is used only internally, by c_make_fname_decl and
1772 undeclared_variable, and is limited to their needs. The NAME is
1773 provided as a separate argument because undeclared_variable wants to
1774 use error_mark_node for X. For VAR_DECLs, duplicate_decls is not
1775 called; if there is any preexisting decl for this identifier, it is
1778 pushdecl_function_level (tree x, tree name)
1780 struct binding_level *scope = current_function_level;
1782 if (x == error_mark_node)
1783 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1785 else if (TREE_CODE (x) == VAR_DECL)
1787 if (name != DECL_NAME (x))
1789 if (IDENTIFIER_SYMBOL_VALUE (name))
1792 DECL_CONTEXT (x) = current_function_decl;
1793 TREE_CHAIN (x) = scope->names;
1797 IDENTIFIER_SYMBOL_VALUE (name) = x;
1800 /* Generate an implicit declaration for identifier FUNCTIONID as a
1801 function of type int (). */
1804 implicitly_declare (tree functionid)
1806 tree decl = any_external_decl (functionid);
1808 if (decl && decl != error_mark_node)
1810 /* Implicit declaration of a function already declared
1811 (somehow) in a different scope, or as a built-in.
1812 If this is the first time this has happened, warn;
1813 then recycle the old declaration. */
1814 if (!C_DECL_IMPLICIT (decl))
1816 implicit_decl_warning (DECL_NAME (decl));
1817 if (! C_DECL_FILE_SCOPE (decl))
1818 warning ("%Hprevious declaration of '%D'",
1819 &DECL_SOURCE_LOCATION (decl), decl);
1820 C_DECL_IMPLICIT (decl) = 1;
1822 /* If this function is global, then it must already be in the
1823 global binding level, so there's no need to push it again. */
1824 if (current_binding_level == global_binding_level)
1826 /* If this is a local declaration, make a copy; we can't have
1827 the same DECL listed in two different binding levels. */
1828 return pushdecl (copy_node (decl));
1831 /* Not seen before. */
1832 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1833 DECL_EXTERNAL (decl) = 1;
1834 TREE_PUBLIC (decl) = 1;
1835 C_DECL_IMPLICIT (decl) = 1;
1836 implicit_decl_warning (functionid);
1838 /* ANSI standard says implicit declarations are in the innermost block.
1839 So we record the decl in the standard fashion. */
1840 decl = pushdecl (decl);
1842 /* No need to call objc_check_decl here - it's a function type. */
1843 rest_of_decl_compilation (decl, NULL, 0, 0);
1845 /* Write a record describing this implicit function declaration to the
1846 prototypes file (if requested). */
1848 gen_aux_info_record (decl, 0, 1, 0);
1850 /* Possibly apply some default attributes to this implicit declaration. */
1851 decl_attributes (&decl, NULL_TREE, 0);
1857 implicit_decl_warning (tree id)
1859 const char *name = IDENTIFIER_POINTER (id);
1860 if (mesg_implicit_function_declaration == 2)
1861 error ("implicit declaration of function `%s'", name);
1862 else if (mesg_implicit_function_declaration == 1)
1863 warning ("implicit declaration of function `%s'", name);
1866 /* Return zero if the declaration NEWDECL is valid
1867 when the declaration OLDDECL (assumed to be for the same name)
1868 has already been seen.
1869 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
1870 and 3 if it is a conflicting declaration. */
1873 redeclaration_error_message (tree newdecl, tree olddecl)
1875 if (TREE_CODE (newdecl) == TYPE_DECL)
1877 /* Do not complain about type redeclarations where at least one
1878 declaration was in a system header. */
1879 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
1883 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1885 /* Declarations of functions can insist on internal linkage
1886 but they can't be inconsistent with internal linkage,
1887 so there can be no error on that account.
1888 However defining the same name twice is no good. */
1889 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
1890 /* However, defining once as extern inline and a second
1891 time in another way is ok. */
1892 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
1893 && ! (DECL_DECLARED_INLINE_P (newdecl)
1894 && DECL_EXTERNAL (newdecl))))
1898 else if (C_DECL_FILE_SCOPE (newdecl))
1900 /* Objects declared at top level: */
1901 /* If at least one is a reference, it's ok. */
1902 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
1904 /* Reject two definitions. */
1905 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
1907 /* Now we have two tentative defs, or one tentative and one real def. */
1908 /* Insist that the linkage match. */
1909 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
1913 else if (current_binding_level->parm_flag
1914 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1918 /* Newdecl has block scope. If olddecl has block scope also, then
1919 reject two definitions, and reject a definition together with an
1920 external reference. Otherwise, it is OK, because newdecl must
1921 be an extern reference to olddecl. */
1922 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
1923 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
1929 /* Issue an error message for a reference to an undeclared variable
1930 ID, including a reference to a builtin outside of function-call
1931 context. Establish a binding of the identifier to error_mark_node
1932 in an appropriate scope, which will suppress further errors for the
1935 undeclared_variable (tree id)
1937 static bool already = false;
1939 if (current_function_decl == 0)
1941 error ("`%s' undeclared here (not in a function)",
1942 IDENTIFIER_POINTER (id));
1943 IDENTIFIER_SYMBOL_VALUE (id) = error_mark_node;
1947 error ("`%s' undeclared (first use in this function)",
1948 IDENTIFIER_POINTER (id));
1952 error ("(Each undeclared identifier is reported only once");
1953 error ("for each function it appears in.)");
1957 pushdecl_function_level (error_mark_node, id);
1961 /* Subroutine of lookup_label, declare_label, define_label: construct a
1962 LABEL_DECL with all the proper frills. */
1965 make_label (tree name, location_t location)
1967 tree label = build_decl (LABEL_DECL, name, void_type_node);
1969 DECL_CONTEXT (label) = current_function_decl;
1970 DECL_MODE (label) = VOIDmode;
1971 DECL_SOURCE_LOCATION (label) = location;
1976 /* Another subroutine of lookup_label, declare_label, define_label:
1977 set up the binding of name to LABEL_DECL in the given SCOPE. */
1980 bind_label (tree name, tree label, struct binding_level *scope)
1982 if (IDENTIFIER_LABEL_VALUE (name))
1983 scope->shadowed = tree_cons (name, IDENTIFIER_LABEL_VALUE (name),
1985 IDENTIFIER_LABEL_VALUE (name) = label;
1987 TREE_CHAIN (label) = scope->names;
1988 scope->names = label;
1991 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
1992 Create one if none exists so far for the current function.
1993 This is called when a label is used in a goto expression or
1994 has its address taken. */
1997 lookup_label (tree name)
2001 if (current_function_decl == 0)
2003 error ("label %s referenced outside of any function",
2004 IDENTIFIER_POINTER (name));
2008 /* Use a label already defined or ref'd with this name, but not if
2009 it is inherited from a containing function and wasn't declared
2011 label = IDENTIFIER_LABEL_VALUE (name);
2012 if (label && (DECL_CONTEXT (label) == current_function_decl
2013 || C_DECLARED_LABEL_FLAG (label)))
2015 /* If the label has only been declared, update its apparent
2016 location to point here, for better diagnostics if it
2017 turns out not to have been defined. */
2018 if (!TREE_USED (label))
2019 DECL_SOURCE_LOCATION (label) = input_location;
2023 /* No label binding for that identifier; make one. */
2024 label = make_label (name, input_location);
2026 /* Ordinary labels go in the current function scope, which is
2027 not necessarily the current label scope. */
2028 bind_label (name, label, current_function_level);
2032 /* Make a label named NAME in the current function, shadowing silently
2033 any that may be inherited from containing functions or containing
2034 scopes. This is called for __label__ declarations. */
2036 /* Note that valid use, if the label being shadowed comes from another
2037 scope in the same function, requires calling declare_nonlocal_label
2038 right away. (Is this still true? -zw 2003-07-17) */
2041 declare_label (tree name)
2043 tree label = IDENTIFIER_LABEL_VALUE (name);
2046 /* Check to make sure that the label hasn't already been declared
2048 for (dup = current_binding_level->names; dup; dup = TREE_CHAIN (dup))
2051 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2052 error ("%Hthis is a previous declaration",
2053 &DECL_SOURCE_LOCATION (dup));
2055 /* Just use the previous declaration. */
2059 label = make_label (name, input_location);
2060 C_DECLARED_LABEL_FLAG (label) = 1;
2062 /* Declared labels go in the current scope. */
2063 bind_label (name, label, current_binding_level);
2067 /* Define a label, specifying the location in the source file.
2068 Return the LABEL_DECL node for the label, if the definition is valid.
2069 Otherwise return 0. */
2072 define_label (location_t location, tree name)
2076 /* Find any preexisting label with this name. It is an error
2077 if that label has already been defined in this function, or
2078 if there is a containing function with a declared label with
2080 label = IDENTIFIER_LABEL_VALUE (name);
2083 && ((DECL_CONTEXT (label) == current_function_decl
2084 && DECL_INITIAL (label) != 0)
2085 || (DECL_CONTEXT (label) != current_function_decl
2086 && C_DECLARED_LABEL_FLAG (label))))
2088 error ("%Hduplicate label `%D'", &location, label);
2089 if (DECL_INITIAL (label))
2090 error ("%H`%D' previously defined here",
2091 &DECL_SOURCE_LOCATION (label), label);
2093 error ("%H`%D' previously declared here",
2094 &DECL_SOURCE_LOCATION (label), label);
2097 else if (label && DECL_CONTEXT (label) == current_function_decl)
2099 /* The label has been used or declared already in this function,
2100 but not defined. Update its location to point to this
2102 DECL_SOURCE_LOCATION (label) = location;
2106 /* No label binding for that identifier; make one. */
2107 label = make_label (name, location);
2109 /* Ordinary labels go in the current function scope, which is
2110 not necessarily the current label scope. */
2111 bind_label (name, label, current_function_level);
2114 if (warn_traditional && !in_system_header && lookup_name (name))
2115 warning ("%Htraditional C lacks a separate namespace for labels, "
2116 "identifier `%s' conflicts", &location,
2117 IDENTIFIER_POINTER (name));
2119 /* Mark label as having been defined. */
2120 DECL_INITIAL (label) = error_mark_node;
2124 /* Return the list of declarations of the current level.
2125 Note that this list is in reverse order unless/until
2126 you nreverse it; and when you do nreverse it, you must
2127 store the result back using `storedecls' or you will lose. */
2132 return current_binding_level->names;
2135 /* Return the list of type-tags (for structs, etc) of the current level. */
2140 return current_binding_level->tags;
2143 /* Store the list of declarations of the current level.
2144 This is done for the parameter declarations of a function being defined,
2145 after they are modified in the light of any missing parameters. */
2148 storedecls (tree decls)
2150 current_binding_level->names = decls;
2153 /* Similarly, store the list of tags of the current level. */
2156 storetags (tree tags)
2158 current_binding_level->tags = tags;
2161 /* Given NAME, an IDENTIFIER_NODE,
2162 return the structure (or union or enum) definition for that name.
2163 If THISLEVEL_ONLY is nonzero, searches only the current_binding_level.
2164 CODE says which kind of type the caller wants;
2165 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2166 If the wrong kind of type is found, an error is reported. */
2169 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2171 tree tag = IDENTIFIER_TAG_VALUE (name);
2177 /* We only care about whether it's in this level if
2178 thislevel_only was set or it might be a type clash. */
2179 if (thislevel_only || TREE_CODE (tag) != code)
2181 if (current_binding_level == global_binding_level
2182 || purpose_member (name, current_binding_level->tags))
2186 if (thislevel_only && !thislevel)
2189 if (TREE_CODE (tag) != code)
2191 /* Definition isn't the kind we were looking for. */
2192 pending_invalid_xref = name;
2193 pending_invalid_xref_location = input_location;
2195 /* If in the same binding level as a declaration as a tag
2196 of a different type, this must not be allowed to
2197 shadow that tag, so give the error immediately.
2198 (For example, "struct foo; union foo;" is invalid.) */
2200 pending_xref_error ();
2205 /* Print an error message now
2206 for a recent invalid struct, union or enum cross reference.
2207 We don't print them immediately because they are not invalid
2208 when used in the `struct foo;' construct for shadowing. */
2211 pending_xref_error (void)
2213 if (pending_invalid_xref != 0)
2214 error ("%H`%s' defined as wrong kind of tag",
2215 &pending_invalid_xref_location,
2216 IDENTIFIER_POINTER (pending_invalid_xref));
2217 pending_invalid_xref = 0;
2221 /* Look up NAME in the current binding level and its superiors
2222 in the namespace of variables, functions and typedefs.
2223 Return a ..._DECL node of some kind representing its definition,
2224 or return 0 if it is undefined. */
2227 lookup_name (tree name)
2229 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2230 if (decl == 0 || decl == error_mark_node)
2232 if (C_DECL_INVISIBLE (decl))
2237 /* Similar to `lookup_name' but look only at the current binding level. */
2240 lookup_name_current_level (tree name)
2242 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2244 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2247 if (current_binding_level == global_binding_level)
2250 /* Scan the current scope for a decl with name NAME. */
2251 if (chain_member (decl, current_binding_level->names))
2257 /* Create the predefined scalar types of C,
2258 and some nodes representing standard constants (0, 1, (void *) 0).
2259 Initialize the global binding level.
2260 Make definitions for built-in primitive functions. */
2263 c_init_decl_processing (void)
2266 tree ptr_ftype_void, ptr_ftype_ptr;
2267 location_t save_loc = input_location;
2269 /* Adds some ggc roots, and reserved words for c-parse.in. */
2272 current_function_decl = NULL;
2273 current_binding_level = NULL_BINDING_LEVEL;
2274 free_binding_level = NULL_BINDING_LEVEL;
2276 /* Make the binding_level structure for global names. */
2278 global_binding_level = current_binding_level;
2279 /* Declarations from c_common_nodes_and_builtins must not be associated
2280 with this input file, lest we get differences between using and not
2281 using preprocessed headers. */
2282 input_location.file = "<internal>";
2283 input_location.line = 0;
2285 /* Make the DECL for the toplevel file scope. */
2286 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
2288 build_common_tree_nodes (flag_signed_char);
2290 c_common_nodes_and_builtins ();
2292 boolean_type_node = integer_type_node;
2293 boolean_true_node = integer_one_node;
2294 boolean_false_node = integer_zero_node;
2296 c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
2297 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2298 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2299 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2300 TYPE_PRECISION (c_bool_type_node) = 1;
2301 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2303 c_bool_false_node = build_int_2 (0, 0);
2304 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2305 c_bool_true_node = build_int_2 (1, 0);
2306 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2308 endlink = void_list_node;
2309 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2311 = build_function_type (ptr_type_node,
2312 tree_cons (NULL_TREE, ptr_type_node, endlink));
2314 input_location = save_loc;
2316 pedantic_lvalues = pedantic;
2318 make_fname_decl = c_make_fname_decl;
2319 start_fname_decls ();
2321 builtin_decls = global_binding_level->names;
2324 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2325 decl, NAME is the initialization string and TYPE_DEP indicates whether
2326 NAME depended on the type of the function. As we don't yet implement
2327 delayed emission of static data, we mark the decl as emitted
2328 so it is not placed in the output. Anything using it must therefore pull
2329 out the STRING_CST initializer directly. This does mean that these names
2330 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2333 c_make_fname_decl (tree id, int type_dep)
2335 const char *name = fname_as_string (type_dep);
2336 tree decl, type, init;
2337 size_t length = strlen (name);
2339 type = build_array_type
2340 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2341 build_index_type (size_int (length)));
2343 decl = build_decl (VAR_DECL, id, type);
2345 TREE_STATIC (decl) = 1;
2346 TREE_READONLY (decl) = 1;
2347 DECL_ARTIFICIAL (decl) = 1;
2349 init = build_string (length + 1, name);
2350 TREE_TYPE (init) = type;
2351 DECL_INITIAL (decl) = init;
2353 TREE_USED (decl) = 1;
2355 if (current_function_decl)
2356 pushdecl_function_level (decl, DECL_NAME (decl));
2358 finish_decl (decl, init, NULL_TREE);
2363 /* Return a definition for a builtin function named NAME and whose data type
2364 is TYPE. TYPE should be a function type with argument types.
2365 FUNCTION_CODE tells later passes how to compile calls to this function.
2366 See tree.h for its possible values.
2368 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2369 the name to be called if we can't opencode the function. If
2370 ATTRS is nonzero, use that for the function's attribute list. */
2373 builtin_function (const char *name, tree type, int function_code,
2374 enum built_in_class class, const char *library_name,
2377 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2378 DECL_EXTERNAL (decl) = 1;
2379 TREE_PUBLIC (decl) = 1;
2381 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2382 make_decl_rtl (decl, NULL);
2384 DECL_BUILT_IN_CLASS (decl) = class;
2385 DECL_FUNCTION_CODE (decl) = function_code;
2387 /* Warn if a function in the namespace for users
2388 is used without an occasion to consider it declared. */
2389 if (name[0] != '_' || name[1] != '_')
2390 C_DECL_INVISIBLE (decl) = 1;
2392 /* Possibly apply some default attributes to this built-in function. */
2394 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2396 decl_attributes (&decl, NULL_TREE, 0);
2401 /* Apply default attributes to a function, if a system function with default
2405 c_insert_default_attributes (tree decl)
2407 if (!TREE_PUBLIC (decl))
2409 c_common_insert_default_attributes (decl);
2412 /* Called when a declaration is seen that contains no names to declare.
2413 If its type is a reference to a structure, union or enum inherited
2414 from a containing scope, shadow that tag name for the current scope
2415 with a forward reference.
2416 If its type defines a new named structure or union
2417 or defines an enum, it is valid but we need not do anything here.
2418 Otherwise, it is an error. */
2421 shadow_tag (tree declspecs)
2423 shadow_tag_warned (declspecs, 0);
2427 shadow_tag_warned (tree declspecs, int warned)
2430 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2437 pending_invalid_xref = 0;
2439 /* Remove the attributes from declspecs, since they will confuse the
2441 split_specs_attrs (declspecs, &specs, &attrs);
2443 for (link = specs; link; link = TREE_CHAIN (link))
2445 tree value = TREE_VALUE (link);
2446 enum tree_code code = TREE_CODE (value);
2448 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2449 /* Used to test also that TYPE_SIZE (value) != 0.
2450 That caused warning for `struct foo;' at top level in the file. */
2452 tree name = TYPE_NAME (value);
2459 if (warned != 1 && code != ENUMERAL_TYPE)
2460 /* Empty unnamed enum OK */
2462 pedwarn ("unnamed struct/union that defines no instances");
2468 t = lookup_tag (code, name, 1);
2472 t = make_node (code);
2479 if (!warned && ! in_system_header)
2481 warning ("useless keyword or type name in empty declaration");
2488 error ("two types specified in one empty declaration");
2493 pedwarn ("empty declaration");
2497 /* Construct an array declarator. EXPR is the expression inside [], or
2498 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2499 to the pointer to which a parameter array is converted). STATIC_P is
2500 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2501 is nonzero is the array is [*], a VLA of unspecified length which is
2502 nevertheless a complete type (not currently implemented by GCC),
2503 zero otherwise. The declarator is constructed as an ARRAY_REF
2504 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2505 left of the [] (filled by in set_array_declarator_type) and operand 1
2506 is the expression inside; whose TREE_TYPE is the type qualifiers and
2507 which has TREE_STATIC set if "static" is used. */
2510 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2513 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2514 TREE_TYPE (decl) = quals;
2515 TREE_STATIC (decl) = (static_p ? 1 : 0);
2516 if (pedantic && !flag_isoc99)
2518 if (static_p || quals != NULL_TREE)
2519 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2521 pedwarn ("ISO C90 does not support `[*]' array declarators");
2524 warning ("GCC does not yet properly implement `[*]' array declarators");
2528 /* Set the type of an array declarator. DECL is the declarator, as
2529 constructed by build_array_declarator; TYPE is what appears on the left
2530 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2531 abstract declarator, zero otherwise; this is used to reject static and
2532 type qualifiers in abstract declarators, where they are not in the
2536 set_array_declarator_type (tree decl, tree type, int abstract_p)
2538 TREE_OPERAND (decl, 0) = type;
2539 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2540 error ("static or type qualifiers in abstract declarator");
2544 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2547 groktypename (tree typename)
2551 if (TREE_CODE (typename) != TREE_LIST)
2554 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2556 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
2558 /* Apply attributes. */
2559 decl_attributes (&typename, attrs, 0);
2564 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2567 groktypename_in_parm_context (tree typename)
2569 if (TREE_CODE (typename) != TREE_LIST)
2571 return grokdeclarator (TREE_VALUE (typename),
2572 TREE_PURPOSE (typename),
2576 /* Decode a declarator in an ordinary declaration or data definition.
2577 This is called as soon as the type information and variable name
2578 have been parsed, before parsing the initializer if any.
2579 Here we create the ..._DECL node, fill in its type,
2580 and put it on the list of decls for the current context.
2581 The ..._DECL node is returned as the value.
2583 Exception: for arrays where the length is not specified,
2584 the type is left null, to be filled in by `finish_decl'.
2586 Function definitions do not come here; they go to start_function
2587 instead. However, external and forward declarations of functions
2588 do go through here. Structure field declarations are done by
2589 grokfield and not through here. */
2592 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2597 /* An object declared as __attribute__((deprecated)) suppresses
2598 warnings of uses of other deprecated items. */
2599 if (lookup_attribute ("deprecated", attributes))
2600 deprecated_state = DEPRECATED_SUPPRESS;
2602 decl = grokdeclarator (declarator, declspecs,
2603 NORMAL, initialized);
2605 deprecated_state = DEPRECATED_NORMAL;
2607 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2608 && MAIN_NAME_P (DECL_NAME (decl)))
2609 warning ("%H'%D' is usually a function",
2610 &DECL_SOURCE_LOCATION (decl), decl);
2613 /* Is it valid for this decl to have an initializer at all?
2614 If not, set INITIALIZED to zero, which will indirectly
2615 tell `finish_decl' to ignore the initializer once it is parsed. */
2616 switch (TREE_CODE (decl))
2619 error ("typedef `%s' is initialized (use __typeof__ instead)",
2620 IDENTIFIER_POINTER (DECL_NAME (decl)));
2625 error ("function `%s' is initialized like a variable",
2626 IDENTIFIER_POINTER (DECL_NAME (decl)));
2631 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2632 error ("parameter `%s' is initialized",
2633 IDENTIFIER_POINTER (DECL_NAME (decl)));
2638 /* Don't allow initializations for incomplete types
2639 except for arrays which might be completed by the initialization. */
2641 /* This can happen if the array size is an undefined macro. We already
2642 gave a warning, so we don't need another one. */
2643 if (TREE_TYPE (decl) == error_mark_node)
2645 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2647 /* A complete type is ok if size is fixed. */
2649 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2650 || C_DECL_VARIABLE_SIZE (decl))
2652 error ("variable-sized object may not be initialized");
2656 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2658 error ("variable `%s' has initializer but incomplete type",
2659 IDENTIFIER_POINTER (DECL_NAME (decl)));
2662 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2664 error ("elements of array `%s' have incomplete type",
2665 IDENTIFIER_POINTER (DECL_NAME (decl)));
2672 DECL_EXTERNAL (decl) = 0;
2673 if (current_binding_level == global_binding_level)
2674 TREE_STATIC (decl) = 1;
2676 /* Tell `pushdecl' this is an initialized decl
2677 even though we don't yet have the initializer expression.
2678 Also tell `finish_decl' it may store the real initializer. */
2679 DECL_INITIAL (decl) = error_mark_node;
2682 /* If this is a function declaration, write a record describing it to the
2683 prototypes file (if requested). */
2685 if (TREE_CODE (decl) == FUNCTION_DECL)
2686 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2688 /* ANSI specifies that a tentative definition which is not merged with
2689 a non-tentative definition behaves exactly like a definition with an
2690 initializer equal to zero. (Section 3.7.2)
2692 -fno-common gives strict ANSI behavior, though this tends to break
2693 a large body of code that grew up without this rule.
2695 Thread-local variables are never common, since there's no entrenched
2696 body of code to break, and it allows more efficient variable references
2697 in the presence of dynamic linking. */
2699 if (TREE_CODE (decl) == VAR_DECL
2701 && TREE_PUBLIC (decl)
2702 && !DECL_THREAD_LOCAL (decl)
2704 DECL_COMMON (decl) = 1;
2706 /* Set attributes here so if duplicate decl, will have proper attributes. */
2707 decl_attributes (&decl, attributes, 0);
2709 if (TREE_CODE (decl) == FUNCTION_DECL
2710 && DECL_DECLARED_INLINE_P (decl)
2711 && DECL_UNINLINABLE (decl)
2712 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2713 warning ("%Hinline function '%D' given attribute noinline",
2714 &DECL_SOURCE_LOCATION (decl), decl);
2716 /* Add this decl to the current binding level.
2717 TEM may equal DECL or it may be a previous decl of the same name. */
2718 tem = pushdecl (decl);
2720 /* For a local variable, define the RTL now. */
2721 if (current_binding_level != global_binding_level
2722 /* But not if this is a duplicate decl
2723 and we preserved the rtl from the previous one
2724 (which may or may not happen). */
2725 && !DECL_RTL_SET_P (tem)
2726 && C_DECL_FILE_SCOPE (tem))
2728 if (TREE_TYPE (tem) != error_mark_node
2729 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
2731 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2732 && DECL_INITIAL (tem) != 0)
2739 /* Finish processing of a declaration;
2740 install its initial value.
2741 If the length of an array type is not known before,
2742 it must be determined now, from the initial value, or it is an error. */
2745 finish_decl (tree decl, tree init, tree asmspec_tree)
2747 tree type = TREE_TYPE (decl);
2748 int was_incomplete = (DECL_SIZE (decl) == 0);
2749 const char *asmspec = 0;
2751 /* If a name was specified, get the string. */
2752 if (current_binding_level == global_binding_level)
2753 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2755 asmspec = TREE_STRING_POINTER (asmspec_tree);
2757 /* If `start_decl' didn't like having an initialization, ignore it now. */
2758 if (init != 0 && DECL_INITIAL (decl) == 0)
2761 /* Don't crash if parm is initialized. */
2762 if (TREE_CODE (decl) == PARM_DECL)
2766 store_init_value (decl, init);
2768 /* Deduce size of array from initialization, if not already known */
2769 if (TREE_CODE (type) == ARRAY_TYPE
2770 && TYPE_DOMAIN (type) == 0
2771 && TREE_CODE (decl) != TYPE_DECL)
2774 = (TREE_STATIC (decl)
2775 /* Even if pedantic, an external linkage array
2776 may have incomplete type at first. */
2777 ? pedantic && !TREE_PUBLIC (decl)
2778 : !DECL_EXTERNAL (decl));
2780 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2782 /* Get the completed type made by complete_array_type. */
2783 type = TREE_TYPE (decl);
2786 error ("%Hinitializer fails to determine size of '%D'",
2787 &DECL_SOURCE_LOCATION (decl), decl);
2789 else if (failure == 2)
2792 error ("%Harray size missing in '%D'",
2793 &DECL_SOURCE_LOCATION (decl), decl);
2794 /* If a `static' var's size isn't known,
2795 make it extern as well as static, so it does not get
2797 If it is not `static', then do not mark extern;
2798 finish_incomplete_decl will give it a default size
2799 and it will get allocated. */
2800 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2801 DECL_EXTERNAL (decl) = 1;
2804 /* TYPE_MAX_VALUE is always one less than the number of elements
2805 in the array, because we start counting at zero. Therefore,
2806 warn only if the value is less than zero. */
2807 else if (pedantic && TYPE_DOMAIN (type) != 0
2808 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2809 error ("%Hzero or negative size array '%D'",
2810 &DECL_SOURCE_LOCATION (decl), decl);
2812 layout_decl (decl, 0);
2815 if (TREE_CODE (decl) == VAR_DECL)
2817 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2818 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2819 layout_decl (decl, 0);
2821 if (DECL_SIZE (decl) == 0
2822 /* Don't give an error if we already gave one earlier. */
2823 && TREE_TYPE (decl) != error_mark_node
2824 && (TREE_STATIC (decl)
2826 /* A static variable with an incomplete type
2827 is an error if it is initialized.
2828 Also if it is not file scope.
2829 Otherwise, let it through, but if it is not `extern'
2830 then it may cause an error message later. */
2831 (DECL_INITIAL (decl) != 0
2832 || !C_DECL_FILE_SCOPE (decl))
2834 /* An automatic variable with an incomplete type
2836 !DECL_EXTERNAL (decl)))
2838 error ("%Hstorage size of '%D' isn't known",
2839 &DECL_SOURCE_LOCATION (decl), decl);
2840 TREE_TYPE (decl) = error_mark_node;
2843 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2844 && DECL_SIZE (decl) != 0)
2846 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2847 constant_expression_warning (DECL_SIZE (decl));
2849 error ("%Hstorage size of '%D' isn't constant",
2850 &DECL_SOURCE_LOCATION (decl), decl);
2853 if (TREE_USED (type))
2854 TREE_USED (decl) = 1;
2857 /* If this is a function and an assembler name is specified, reset DECL_RTL
2858 so we can give it its new name. Also, update built_in_decls if it
2859 was a normal built-in. */
2860 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2862 /* ASMSPEC is given, and not the name of a register. Mark the
2863 name with a star so assemble_name won't munge it. */
2864 char *starred = alloca (strlen (asmspec) + 2);
2866 strcpy (starred + 1, asmspec);
2868 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2870 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2871 SET_DECL_RTL (builtin, NULL_RTX);
2872 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2873 #ifdef TARGET_MEM_FUNCTIONS
2874 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2875 init_block_move_fn (starred);
2876 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2877 init_block_clear_fn (starred);
2879 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2880 init_block_move_fn (starred);
2881 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2882 init_block_clear_fn (starred);
2885 SET_DECL_RTL (decl, NULL_RTX);
2886 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (starred));
2889 /* If #pragma weak was used, mark the decl weak now. */
2890 if (current_binding_level == global_binding_level)
2891 maybe_apply_pragma_weak (decl);
2893 /* Output the assembler code and/or RTL code for variables and functions,
2894 unless the type is an undefined structure or union.
2895 If not, it will get done when the type is completed. */
2897 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2899 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2900 if (c_dialect_objc ())
2901 objc_check_decl (decl);
2903 if (C_DECL_FILE_SCOPE (decl))
2905 if (DECL_INITIAL (decl) == NULL_TREE
2906 || DECL_INITIAL (decl) == error_mark_node)
2907 /* Don't output anything
2908 when a tentative file-scope definition is seen.
2909 But at end of compilation, do output code for them. */
2910 DECL_DEFER_OUTPUT (decl) = 1;
2911 rest_of_decl_compilation (decl, asmspec, true, 0);
2915 /* This is a local variable. If there is an ASMSPEC, the
2916 user has requested that we handle it specially. */
2919 /* In conjunction with an ASMSPEC, the `register'
2920 keyword indicates that we should place the variable
2921 in a particular register. */
2922 if (DECL_REGISTER (decl))
2923 DECL_C_HARD_REGISTER (decl) = 1;
2925 /* If this is not a static variable, issue a warning.
2926 It doesn't make any sense to give an ASMSPEC for an
2927 ordinary, non-register local variable. Historically,
2928 GCC has accepted -- but ignored -- the ASMSPEC in
2930 if (TREE_CODE (decl) == VAR_DECL
2931 && !DECL_REGISTER (decl)
2932 && !TREE_STATIC (decl))
2933 warning ("%Hignoring asm-specifier for non-static local "
2934 "variable '%D'", &DECL_SOURCE_LOCATION (decl), decl);
2936 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
2939 if (TREE_CODE (decl) != FUNCTION_DECL)
2940 add_decl_stmt (decl);
2943 if (!C_DECL_FILE_SCOPE (decl))
2945 /* Recompute the RTL of a local array now
2946 if it used to be an incomplete type. */
2948 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2950 /* If we used it already as memory, it must stay in memory. */
2951 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2952 /* If it's still incomplete now, no init will save it. */
2953 if (DECL_SIZE (decl) == 0)
2954 DECL_INITIAL (decl) = 0;
2959 /* If this was marked 'used', be sure it will be output. */
2960 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2961 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2963 if (TREE_CODE (decl) == TYPE_DECL)
2965 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2966 if (c_dialect_objc ())
2967 objc_check_decl (decl);
2968 rest_of_decl_compilation (decl, NULL, C_DECL_FILE_SCOPE (decl), 0);
2971 /* At the end of a declaration, throw away any variable type sizes
2972 of types defined inside that declaration. There is no use
2973 computing them in the following function definition. */
2974 if (current_binding_level == global_binding_level)
2975 get_pending_sizes ();
2977 /* Install a cleanup (aka destructor) if one was given. */
2978 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2980 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2983 static bool eh_initialized_p;
2985 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2986 tree cleanup_decl = lookup_name (cleanup_id);
2989 /* Build "cleanup(&decl)" for the destructor. */
2990 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2991 cleanup = build_tree_list (NULL_TREE, cleanup);
2992 cleanup = build_function_call (cleanup_decl, cleanup);
2994 /* Don't warn about decl unused; the cleanup uses it. */
2995 TREE_USED (decl) = 1;
2997 /* Initialize EH, if we've been told to do so. */
2998 if (flag_exceptions && !eh_initialized_p)
3000 eh_initialized_p = true;
3001 eh_personality_libfunc
3002 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3003 ? "__gcc_personality_sj0"
3004 : "__gcc_personality_v0");
3005 using_eh_for_cleanups ();
3008 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
3013 /* Given a parsed parameter declaration,
3014 decode it into a PARM_DECL and push that on the current binding level.
3015 Also, for the sake of forward parm decls,
3016 record the given order of parms in `parm_order'. */
3019 push_parm_decl (tree parm)
3022 int old_immediate_size_expand = immediate_size_expand;
3023 /* Don't try computing parm sizes now -- wait till fn is called. */
3024 immediate_size_expand = 0;
3026 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3027 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3028 decl_attributes (&decl, TREE_VALUE (parm), 0);
3030 decl = pushdecl (decl);
3032 immediate_size_expand = old_immediate_size_expand;
3034 current_binding_level->parm_order
3035 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3037 /* Add this decl to the current binding level. */
3038 finish_decl (decl, NULL_TREE, NULL_TREE);
3041 /* Clear the given order of parms in `parm_order'.
3042 Used at start of parm list,
3043 and also at semicolon terminating forward decls. */
3046 clear_parm_order (void)
3048 current_binding_level->parm_order = NULL_TREE;
3051 static GTY(()) int compound_literal_number;
3053 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3054 literal, which may be an incomplete array type completed by the
3055 initializer; INIT is a CONSTRUCTOR that initializes the compound
3059 build_compound_literal (tree type, tree init)
3061 /* We do not use start_decl here because we have a type, not a declarator;
3062 and do not use finish_decl because the decl should be stored inside
3063 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3064 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3067 DECL_EXTERNAL (decl) = 0;
3068 TREE_PUBLIC (decl) = 0;
3069 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3070 DECL_CONTEXT (decl) = current_function_decl;
3071 TREE_USED (decl) = 1;
3072 TREE_TYPE (decl) = type;
3073 TREE_READONLY (decl) = TREE_READONLY (type);
3074 store_init_value (decl, init);
3076 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3078 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3083 type = TREE_TYPE (decl);
3084 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3085 return error_mark_node;
3087 stmt = build_stmt (DECL_STMT, decl);
3088 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3089 TREE_SIDE_EFFECTS (complit) = 1;
3091 layout_decl (decl, 0);
3093 if (TREE_STATIC (decl))
3095 /* This decl needs a name for the assembler output. We also need
3096 a unique suffix to be added to the name. */
3099 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3100 compound_literal_number);
3101 compound_literal_number++;
3102 DECL_NAME (decl) = get_identifier (name);
3103 DECL_DEFER_OUTPUT (decl) = 1;
3104 DECL_COMDAT (decl) = 1;
3105 DECL_ARTIFICIAL (decl) = 1;
3107 rest_of_decl_compilation (decl, NULL, 1, 0);
3113 /* Make TYPE a complete type based on INITIAL_VALUE.
3114 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3115 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3118 complete_array_type (tree type, tree initial_value, int do_default)
3120 tree maxindex = NULL_TREE;
3125 /* Note MAXINDEX is really the maximum index,
3126 one less than the size. */
3127 if (TREE_CODE (initial_value) == STRING_CST)
3130 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3131 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3134 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3136 tree elts = CONSTRUCTOR_ELTS (initial_value);
3137 maxindex = build_int_2 (-1, -1);
3138 for (; elts; elts = TREE_CHAIN (elts))
3140 if (TREE_PURPOSE (elts))
3141 maxindex = TREE_PURPOSE (elts);
3143 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3144 maxindex, integer_one_node));
3146 maxindex = copy_node (maxindex);
3150 /* Make an error message unless that happened already. */
3151 if (initial_value != error_mark_node)
3154 /* Prevent further error messages. */
3155 maxindex = build_int_2 (0, 0);
3162 maxindex = build_int_2 (0, 0);
3168 TYPE_DOMAIN (type) = build_index_type (maxindex);
3169 if (!TREE_TYPE (maxindex))
3170 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3173 /* Lay out the type now that we can get the real answer. */
3180 /* Determine whether TYPE is a structure with a flexible array member,
3181 or a union containing such a structure (possibly recursively). */
3184 flexible_array_type_p (tree type)
3187 switch (TREE_CODE (type))
3190 x = TYPE_FIELDS (type);
3193 while (TREE_CHAIN (x) != NULL_TREE)
3195 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3196 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3197 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3198 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3202 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3204 if (flexible_array_type_p (TREE_TYPE (x)))
3213 /* Given declspecs and a declarator,
3214 determine the name and type of the object declared
3215 and construct a ..._DECL node for it.
3216 (In one case we can return a ..._TYPE node instead.
3217 For invalid input we sometimes return 0.)
3219 DECLSPECS is a chain of tree_list nodes whose value fields
3220 are the storage classes and type specifiers.
3222 DECL_CONTEXT says which syntactic context this declaration is in:
3223 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3224 FUNCDEF for a function definition. Like NORMAL but a few different
3225 error messages in each case. Return value may be zero meaning
3226 this definition is too screwy to try to parse.
3227 PARM for a parameter declaration (either within a function prototype
3228 or before a function body). Make a PARM_DECL, or return void_type_node.
3229 TYPENAME if for a typename (in a cast or sizeof).
3230 Don't make a DECL node; just return the ..._TYPE node.
3231 FIELD for a struct or union field; make a FIELD_DECL.
3232 BITFIELD for a field with specified width.
3233 INITIALIZED is 1 if the decl has an initializer.
3235 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3236 It may also be so in the PARM case, for a prototype where the
3237 argument type is specified but not the name.
3239 This function is where the complicated C meanings of `static'
3240 and `extern' are interpreted. */
3243 grokdeclarator (tree declarator, tree declspecs,
3244 enum decl_context decl_context, int initialized)
3248 tree type = NULL_TREE;
3253 int type_quals = TYPE_UNQUALIFIED;
3255 int explicit_int = 0;
3256 int explicit_char = 0;
3257 int defaulted_int = 0;
3258 tree typedef_decl = 0;
3260 tree typedef_type = 0;
3261 int funcdef_flag = 0;
3262 enum tree_code innermost_code = ERROR_MARK;
3264 int size_varies = 0;
3265 tree decl_attr = NULL_TREE;
3266 tree array_ptr_quals = NULL_TREE;
3267 int array_parm_static = 0;
3268 tree returned_attrs = NULL_TREE;
3270 if (decl_context == BITFIELD)
3271 bitfield = 1, decl_context = FIELD;
3273 if (decl_context == FUNCDEF)
3274 funcdef_flag = 1, decl_context = NORMAL;
3276 /* Look inside a declarator for the name being declared
3277 and get it as a string, for an error message. */
3279 tree decl = declarator;
3283 switch (TREE_CODE (decl))
3288 innermost_code = TREE_CODE (decl);
3289 decl = TREE_OPERAND (decl, 0);
3293 decl = TREE_VALUE (decl);
3296 case IDENTIFIER_NODE:
3297 name = IDENTIFIER_POINTER (decl);
3308 /* A function definition's declarator must have the form of
3309 a function declarator. */
3311 if (funcdef_flag && innermost_code != CALL_EXPR)
3314 /* Anything declared one level down from the top level
3315 must be one of the parameters of a function
3316 (because the body is at least two levels down). */
3318 /* If this looks like a function definition, make it one,
3319 even if it occurs where parms are expected.
3320 Then store_parm_decls will reject it and not use it as a parm. */
3321 if (decl_context == NORMAL && !funcdef_flag
3322 && current_binding_level->parm_flag)
3323 decl_context = PARM;
3325 /* Look through the decl specs and record which ones appear.
3326 Some typespecs are defined as built-in typenames.
3327 Others, the ones that are modifiers of other types,
3328 are represented by bits in SPECBITS: set the bits for
3329 the modifiers that appear. Storage class keywords are also in SPECBITS.
3331 If there is a typedef name or a type, store the type in TYPE.
3332 This includes builtin typedefs such as `int'.
3334 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3335 and did not come from a user typedef.
3337 Set LONGLONG if `long' is mentioned twice. */
3339 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3341 tree id = TREE_VALUE (spec);
3343 /* If the entire declaration is itself tagged as deprecated then
3344 suppress reports of deprecated items. */
3345 if (id && TREE_DEPRECATED (id))
3347 if (deprecated_state != DEPRECATED_SUPPRESS)
3348 warn_deprecated_use (id);
3351 if (id == ridpointers[(int) RID_INT])
3353 if (id == ridpointers[(int) RID_CHAR])
3356 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3358 enum rid i = C_RID_CODE (id);
3359 if ((int) i <= (int) RID_LAST_MODIFIER)
3361 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3364 error ("`long long long' is too long for GCC");
3367 if (pedantic && !flag_isoc99 && ! in_system_header
3369 pedwarn ("ISO C90 does not support `long long'");
3373 else if (specbits & (1 << (int) i))
3375 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3378 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3381 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3384 /* Diagnose "__thread extern". Recall that this list
3385 is in the reverse order seen in the text. */
3387 && (specbits & (1 << (int) RID_EXTERN
3388 | 1 << (int) RID_STATIC)))
3390 if (specbits & 1 << (int) RID_EXTERN)
3391 error ("`__thread' before `extern'");
3393 error ("`__thread' before `static'");
3396 specbits |= 1 << (int) i;
3401 error ("two or more data types in declaration of `%s'", name);
3402 /* Actual typedefs come to us as TYPE_DECL nodes. */
3403 else if (TREE_CODE (id) == TYPE_DECL)
3405 if (TREE_TYPE (id) == error_mark_node)
3406 ; /* Allow the type to default to int to avoid cascading errors. */
3409 type = TREE_TYPE (id);
3410 decl_attr = DECL_ATTRIBUTES (id);
3414 /* Built-in types come as identifiers. */
3415 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3417 tree t = lookup_name (id);
3418 if (TREE_TYPE (t) == error_mark_node)
3420 else if (!t || TREE_CODE (t) != TYPE_DECL)
3421 error ("`%s' fails to be a typedef or built in type",
3422 IDENTIFIER_POINTER (id));
3425 type = TREE_TYPE (t);
3429 else if (TREE_CODE (id) != ERROR_MARK)
3436 typedef_type = type;
3438 size_varies = C_TYPE_VARIABLE_SIZE (type);
3440 /* No type at all: default to `int', and set DEFAULTED_INT
3441 because it was not a user-defined typedef. */
3445 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3446 | (1 << (int) RID_SIGNED)
3447 | (1 << (int) RID_UNSIGNED)
3448 | (1 << (int) RID_COMPLEX))))
3449 /* Don't warn about typedef foo = bar. */
3450 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3451 && ! in_system_header)
3453 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3454 and this is a function, or if -Wimplicit; prefer the former
3455 warning since it is more explicit. */
3456 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3458 warn_about_return_type = 1;
3459 else if (warn_implicit_int || flag_isoc99)
3460 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3465 type = integer_type_node;
3468 /* Now process the modifiers that were specified
3469 and check for invalid combinations. */
3471 /* Long double is a special combination. */
3473 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3474 && TYPE_MAIN_VARIANT (type) == double_type_node)
3476 specbits &= ~(1 << (int) RID_LONG);
3477 type = long_double_type_node;
3480 /* Check all other uses of type modifiers. */
3482 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3483 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3487 if ((specbits & 1 << (int) RID_LONG)
3488 && (specbits & 1 << (int) RID_SHORT))
3489 error ("both long and short specified for `%s'", name);
3490 else if (((specbits & 1 << (int) RID_LONG)
3491 || (specbits & 1 << (int) RID_SHORT))
3493 error ("long or short specified with char for `%s'", name);
3494 else if (((specbits & 1 << (int) RID_LONG)
3495 || (specbits & 1 << (int) RID_SHORT))
3496 && TREE_CODE (type) == REAL_TYPE)
3498 static int already = 0;
3500 error ("long or short specified with floating type for `%s'", name);
3501 if (! already && ! pedantic)
3503 error ("the only valid combination is `long double'");
3507 else if ((specbits & 1 << (int) RID_SIGNED)
3508 && (specbits & 1 << (int) RID_UNSIGNED))
3509 error ("both signed and unsigned specified for `%s'", name);
3510 else if (TREE_CODE (type) != INTEGER_TYPE)
3511 error ("long, short, signed or unsigned invalid for `%s'", name);
3515 if (!explicit_int && !defaulted_int && !explicit_char)
3517 error ("long, short, signed or unsigned used invalidly for `%s'",
3523 /* Discard the type modifiers if they are invalid. */
3526 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3527 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3532 if ((specbits & (1 << (int) RID_COMPLEX))
3533 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3535 error ("complex invalid for `%s'", name);
3536 specbits &= ~(1 << (int) RID_COMPLEX);
3539 /* Decide whether an integer type is signed or not.
3540 Optionally treat bitfields as signed by default. */
3541 if (specbits & 1 << (int) RID_UNSIGNED
3542 || (bitfield && ! flag_signed_bitfields
3543 && (explicit_int || defaulted_int || explicit_char
3544 /* A typedef for plain `int' without `signed'
3545 can be controlled just like plain `int'. */
3546 || ! (typedef_decl != 0
3547 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3548 && TREE_CODE (type) != ENUMERAL_TYPE
3549 && !(specbits & 1 << (int) RID_SIGNED)))
3552 type = long_long_unsigned_type_node;
3553 else if (specbits & 1 << (int) RID_LONG)
3554 type = long_unsigned_type_node;
3555 else if (specbits & 1 << (int) RID_SHORT)
3556 type = short_unsigned_type_node;
3557 else if (type == char_type_node)
3558 type = unsigned_char_type_node;
3559 else if (typedef_decl)
3560 type = c_common_unsigned_type (type);
3562 type = unsigned_type_node;
3564 else if ((specbits & 1 << (int) RID_SIGNED)
3565 && type == char_type_node)
3566 type = signed_char_type_node;
3568 type = long_long_integer_type_node;
3569 else if (specbits & 1 << (int) RID_LONG)
3570 type = long_integer_type_node;
3571 else if (specbits & 1 << (int) RID_SHORT)
3572 type = short_integer_type_node;
3574 if (specbits & 1 << (int) RID_COMPLEX)
3576 if (pedantic && !flag_isoc99)
3577 pedwarn ("ISO C90 does not support complex types");
3578 /* If we just have "complex", it is equivalent to
3579 "complex double", but if any modifiers at all are specified it is
3580 the complex form of TYPE. E.g, "complex short" is
3581 "complex short int". */
3583 if (defaulted_int && ! longlong
3584 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3585 | (1 << (int) RID_SIGNED)
3586 | (1 << (int) RID_UNSIGNED))))
3589 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3590 type = complex_double_type_node;
3592 else if (type == integer_type_node)
3595 pedwarn ("ISO C does not support complex integer types");
3596 type = complex_integer_type_node;
3598 else if (type == float_type_node)
3599 type = complex_float_type_node;
3600 else if (type == double_type_node)
3601 type = complex_double_type_node;
3602 else if (type == long_double_type_node)
3603 type = complex_long_double_type_node;
3607 pedwarn ("ISO C does not support complex integer types");
3608 type = build_complex_type (type);
3612 /* Figure out the type qualifiers for the declaration. There are
3613 two ways a declaration can become qualified. One is something
3614 like `const int i' where the `const' is explicit. Another is
3615 something like `typedef const int CI; CI i' where the type of the
3616 declaration contains the `const'. */
3617 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3618 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
3619 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3620 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3621 if (constp > 1 && ! flag_isoc99)
3622 pedwarn ("duplicate `const'");
3623 if (restrictp > 1 && ! flag_isoc99)
3624 pedwarn ("duplicate `restrict'");
3625 if (volatilep > 1 && ! flag_isoc99)
3626 pedwarn ("duplicate `volatile'");
3627 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3628 type = TYPE_MAIN_VARIANT (type);
3629 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3630 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3631 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3633 /* Warn if two storage classes are given. Default to `auto'. */
3638 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3639 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3640 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3641 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3642 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3644 /* "static __thread" and "extern __thread" are allowed. */
3645 if ((specbits & (1 << (int) RID_THREAD
3646 | 1 << (int) RID_STATIC
3647 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3650 /* Warn about storage classes that are invalid for certain
3651 kinds of declarations (parameters, typenames, etc.). */
3654 error ("multiple storage classes in declaration of `%s'", name);
3655 else if (funcdef_flag
3657 & ((1 << (int) RID_REGISTER)
3658 | (1 << (int) RID_AUTO)
3659 | (1 << (int) RID_TYPEDEF)
3660 | (1 << (int) RID_THREAD))))
3662 if (specbits & 1 << (int) RID_AUTO
3663 && (pedantic || current_binding_level == global_binding_level))
3664 pedwarn ("function definition declared `auto'");
3665 if (specbits & 1 << (int) RID_REGISTER)
3666 error ("function definition declared `register'");
3667 if (specbits & 1 << (int) RID_TYPEDEF)
3668 error ("function definition declared `typedef'");
3669 if (specbits & 1 << (int) RID_THREAD)
3670 error ("function definition declared `__thread'");
3671 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3672 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3674 else if (decl_context != NORMAL && nclasses > 0)
3676 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3680 switch (decl_context)
3683 error ("storage class specified for structure field `%s'",
3687 error ("storage class specified for parameter `%s'", name);
3690 error ("storage class specified for typename");
3693 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3694 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3695 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3698 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3700 /* `extern' with initialization is invalid if not at top level. */
3701 if (current_binding_level == global_binding_level)
3702 warning ("`%s' initialized and declared `extern'", name);
3704 error ("`%s' has both `extern' and initializer", name);
3706 else if (current_binding_level == global_binding_level)
3708 if (specbits & 1 << (int) RID_AUTO)
3709 error ("top-level declaration of `%s' specifies `auto'", name);
3713 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3714 error ("nested function `%s' declared `extern'", name);
3715 else if ((specbits & (1 << (int) RID_THREAD
3716 | 1 << (int) RID_EXTERN
3717 | 1 << (int) RID_STATIC))
3718 == (1 << (int) RID_THREAD))
3720 error ("function-scope `%s' implicitly auto and declared `__thread'",
3722 specbits &= ~(1 << (int) RID_THREAD);
3727 /* Now figure out the structure of the declarator proper.
3728 Descend through it, creating more complex types, until we reach
3729 the declared identifier (or NULL_TREE, in an absolute declarator). */
3731 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3733 if (type == error_mark_node)
3735 declarator = TREE_OPERAND (declarator, 0);
3739 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3740 an INDIRECT_REF (for *...),
3741 a CALL_EXPR (for ...(...)),
3742 a TREE_LIST (for nested attributes),
3743 an identifier (for the name being declared)
3744 or a null pointer (for the place in an absolute declarator
3745 where the name was omitted).
3746 For the last two cases, we have just exited the loop.
3748 At this point, TYPE is the type of elements of an array,
3749 or for a function to return, or for a pointer to point to.
3750 After this sequence of ifs, TYPE is the type of the
3751 array or function or pointer, and DECLARATOR has had its
3752 outermost layer removed. */
3754 if (array_ptr_quals != NULL_TREE || array_parm_static)
3756 /* Only the innermost declarator (making a parameter be of
3757 array type which is converted to pointer type)
3758 may have static or type qualifiers. */
3759 error ("static or type qualifiers in non-parameter array declarator");
3760 array_ptr_quals = NULL_TREE;
3761 array_parm_static = 0;
3764 if (TREE_CODE (declarator) == TREE_LIST)
3766 /* We encode a declarator with embedded attributes using
3768 tree attrs = TREE_PURPOSE (declarator);
3771 declarator = TREE_VALUE (declarator);
3772 inner_decl = declarator;
3773 while (inner_decl != NULL_TREE
3774 && TREE_CODE (inner_decl) == TREE_LIST)
3775 inner_decl = TREE_VALUE (inner_decl);
3776 if (inner_decl == NULL_TREE
3777 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3778 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3779 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3780 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3781 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3782 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3783 returned_attrs = decl_attributes (&type,
3784 chainon (returned_attrs, attrs),
3787 else if (TREE_CODE (declarator) == ARRAY_REF)
3789 tree itype = NULL_TREE;
3790 tree size = TREE_OPERAND (declarator, 1);
3791 /* The index is a signed object `sizetype' bits wide. */
3792 tree index_type = c_common_signed_type (sizetype);
3794 array_ptr_quals = TREE_TYPE (declarator);
3795 array_parm_static = TREE_STATIC (declarator);
3797 declarator = TREE_OPERAND (declarator, 0);
3799 /* Check for some types that there cannot be arrays of. */
3801 if (VOID_TYPE_P (type))
3803 error ("declaration of `%s' as array of voids", name);
3804 type = error_mark_node;
3807 if (TREE_CODE (type) == FUNCTION_TYPE)
3809 error ("declaration of `%s' as array of functions", name);
3810 type = error_mark_node;
3813 if (pedantic && flexible_array_type_p (type))
3814 pedwarn ("invalid use of structure with flexible array member");
3816 if (size == error_mark_node)
3817 type = error_mark_node;
3819 if (type == error_mark_node)
3822 /* If size was specified, set ITYPE to a range-type for that size.
3823 Otherwise, ITYPE remains null. finish_decl may figure it out
3824 from an initial value. */
3828 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3829 STRIP_TYPE_NOPS (size);
3831 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3833 error ("size of array `%s' has non-integer type", name);
3834 size = integer_one_node;
3837 if (pedantic && integer_zerop (size))
3838 pedwarn ("ISO C forbids zero-size array `%s'", name);
3840 if (TREE_CODE (size) == INTEGER_CST)
3842 constant_expression_warning (size);
3843 if (tree_int_cst_sgn (size) < 0)
3845 error ("size of array `%s' is negative", name);
3846 size = integer_one_node;
3851 /* Make sure the array size remains visibly nonconstant
3852 even if it is (eg) a const variable with known value. */
3855 if (!flag_isoc99 && pedantic)
3857 if (TREE_CONSTANT (size))
3858 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3861 pedwarn ("ISO C90 forbids variable-size array `%s'",
3866 if (integer_zerop (size))
3868 /* A zero-length array cannot be represented with an
3869 unsigned index type, which is what we'll get with
3870 build_index_type. Create an open-ended range instead. */
3871 itype = build_range_type (sizetype, size, NULL_TREE);
3875 /* Compute the maximum valid index, that is, size - 1.
3876 Do the calculation in index_type, so that if it is
3877 a variable the computations will be done in the
3879 itype = fold (build (MINUS_EXPR, index_type,
3880 convert (index_type, size),
3881 convert (index_type, size_one_node)));
3883 /* If that overflowed, the array is too big.
3884 ??? While a size of INT_MAX+1 technically shouldn't
3885 cause an overflow (because we subtract 1), the overflow
3886 is recorded during the conversion to index_type, before
3887 the subtraction. Handling this case seems like an
3888 unnecessary complication. */
3889 if (TREE_OVERFLOW (itype))
3891 error ("size of array `%s' is too large", name);
3892 type = error_mark_node;
3898 /* We must be able to distinguish the
3899 SAVE_EXPR_CONTEXT for the variably-sized type
3900 so that we can set it correctly in
3901 set_save_expr_context. The convention is
3902 that all SAVE_EXPRs that need to be reset
3903 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3904 tree cfd = current_function_decl;
3905 if (decl_context == PARM)
3906 current_function_decl = NULL_TREE;
3907 itype = variable_size (itype);
3908 if (decl_context == PARM)
3909 current_function_decl = cfd;
3911 itype = build_index_type (itype);
3914 else if (decl_context == FIELD)
3916 if (pedantic && !flag_isoc99 && !in_system_header)
3917 pedwarn ("ISO C90 does not support flexible array members");
3919 /* ISO C99 Flexible array members are effectively identical
3920 to GCC's zero-length array extension. */
3921 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3924 /* If pedantic, complain about arrays of incomplete types. */
3926 if (pedantic && !COMPLETE_TYPE_P (type))
3927 pedwarn ("array type has incomplete element type");
3929 /* Build the array type itself, then merge any constancy or
3930 volatility into the target type. We must do it in this order
3931 to ensure that the TYPE_MAIN_VARIANT field of the array type
3932 is set correctly. */
3934 type = build_array_type (type, itype);
3936 type = c_build_qualified_type (type, type_quals);
3939 C_TYPE_VARIABLE_SIZE (type) = 1;
3941 /* The GCC extension for zero-length arrays differs from
3942 ISO flexible array members in that sizeof yields zero. */
3943 if (size && integer_zerop (size))
3946 TYPE_SIZE (type) = bitsize_zero_node;
3947 TYPE_SIZE_UNIT (type) = size_zero_node;
3949 if (decl_context != PARM
3950 && (array_ptr_quals != NULL_TREE || array_parm_static))
3952 error ("static or type qualifiers in non-parameter array declarator");
3953 array_ptr_quals = NULL_TREE;
3954 array_parm_static = 0;
3957 else if (TREE_CODE (declarator) == CALL_EXPR)
3961 /* Declaring a function type.
3962 Make sure we have a valid type for the function to return. */
3963 if (type == error_mark_node)
3968 /* Warn about some types functions can't return. */
3970 if (TREE_CODE (type) == FUNCTION_TYPE)
3972 error ("`%s' declared as function returning a function", name);
3973 type = integer_type_node;
3975 if (TREE_CODE (type) == ARRAY_TYPE)
3977 error ("`%s' declared as function returning an array", name);
3978 type = integer_type_node;
3981 /* Construct the function type and go to the next
3982 inner layer of declarator. */
3984 arg_types = grokparms (TREE_OPERAND (declarator, 1),
3986 /* Say it's a definition
3987 only for the CALL_EXPR
3988 closest to the identifier. */
3989 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
3990 /* Type qualifiers before the return type of the function
3991 qualify the return type, not the function type. */
3994 /* Type qualifiers on a function return type are normally
3995 permitted by the standard but have no effect, so give a
3996 warning at -Wextra. Qualifiers on a void return type have
3997 meaning as a GNU extension, and are banned on function
3998 definitions in ISO C. FIXME: strictly we shouldn't
3999 pedwarn for qualified void return types except on function
4000 definitions, but not doing so could lead to the undesirable
4001 state of a "volatile void" function return type not being
4002 warned about, and a use of the function being compiled
4003 with GNU semantics, with no diagnostics under -pedantic. */
4004 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4005 pedwarn ("ISO C forbids qualified void function return type");
4006 else if (extra_warnings
4007 && !(VOID_TYPE_P (type)
4008 && type_quals == TYPE_QUAL_VOLATILE))
4009 warning ("type qualifiers ignored on function return type");
4011 type = c_build_qualified_type (type, type_quals);
4013 type_quals = TYPE_UNQUALIFIED;
4015 type = build_function_type (type, arg_types);
4016 declarator = TREE_OPERAND (declarator, 0);
4018 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4019 the formal parameter list of this FUNCTION_TYPE to point to
4020 the FUNCTION_TYPE node itself. */
4025 for (link = last_function_parm_tags;
4027 link = TREE_CHAIN (link))
4028 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4031 else if (TREE_CODE (declarator) == INDIRECT_REF)
4033 /* Merge any constancy or volatility into the target type
4036 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4038 pedwarn ("ISO C forbids qualified function types");
4040 type = c_build_qualified_type (type, type_quals);
4041 type_quals = TYPE_UNQUALIFIED;
4044 type = build_pointer_type (type);
4046 /* Process a list of type modifier keywords
4047 (such as const or volatile) that were given inside the `*'. */
4049 if (TREE_TYPE (declarator))
4057 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4058 typemodlist = TREE_CHAIN (typemodlist))
4060 tree qualifier = TREE_VALUE (typemodlist);
4062 if (C_IS_RESERVED_WORD (qualifier))
4064 if (C_RID_CODE (qualifier) == RID_CONST)
4066 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4068 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4078 error ("invalid type modifier within pointer declarator");
4079 if (constp > 1 && ! flag_isoc99)
4080 pedwarn ("duplicate `const'");
4081 if (volatilep > 1 && ! flag_isoc99)
4082 pedwarn ("duplicate `volatile'");
4083 if (restrictp > 1 && ! flag_isoc99)
4084 pedwarn ("duplicate `restrict'");
4086 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4087 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4088 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4091 declarator = TREE_OPERAND (declarator, 0);
4098 /* Now TYPE has the actual type. */
4100 /* Did array size calculations overflow? */
4102 if (TREE_CODE (type) == ARRAY_TYPE
4103 && COMPLETE_TYPE_P (type)
4104 && TREE_OVERFLOW (TYPE_SIZE (type)))
4106 error ("size of array `%s' is too large", name);
4107 /* If we proceed with the array type as it is, we'll eventually
4108 crash in tree_low_cst(). */
4109 type = error_mark_node;
4112 /* If this is declaring a typedef name, return a TYPE_DECL. */
4114 if (specbits & (1 << (int) RID_TYPEDEF))
4117 /* Note that the grammar rejects storage classes
4118 in typenames, fields or parameters */
4119 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4121 pedwarn ("ISO C forbids qualified function types");
4123 type = c_build_qualified_type (type, type_quals);
4124 decl = build_decl (TYPE_DECL, declarator, type);
4125 if ((specbits & (1 << (int) RID_SIGNED))
4126 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4127 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4128 decl_attributes (&decl, returned_attrs, 0);
4132 /* Detect the case of an array type of unspecified size
4133 which came, as such, direct from a typedef name.
4134 We must copy the type, so that each identifier gets
4135 a distinct type, so that each identifier's size can be
4136 controlled separately by its own initializer. */
4138 if (type != 0 && typedef_type != 0
4139 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4140 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4142 type = build_array_type (TREE_TYPE (type), 0);
4144 C_TYPE_VARIABLE_SIZE (type) = 1;
4147 /* If this is a type name (such as, in a cast or sizeof),
4148 compute the type and return it now. */
4150 if (decl_context == TYPENAME)
4152 /* Note that the grammar rejects storage classes
4153 in typenames, fields or parameters */
4154 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4156 pedwarn ("ISO C forbids const or volatile function types");
4158 type = c_build_qualified_type (type, type_quals);
4159 decl_attributes (&type, returned_attrs, 0);
4163 /* Aside from typedefs and type names (handle above),
4164 `void' at top level (not within pointer)
4165 is allowed only in public variables.
4166 We don't complain about parms either, but that is because
4167 a better error message can be made later. */
4169 if (VOID_TYPE_P (type) && decl_context != PARM
4170 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4171 && ((specbits & (1 << (int) RID_EXTERN))
4172 || (current_binding_level == global_binding_level
4174 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4176 error ("variable or field `%s' declared void", name);
4177 type = integer_type_node;
4180 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4181 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4186 if (decl_context == PARM)
4188 tree type_as_written;
4191 /* A parameter declared as an array of T is really a pointer to T.
4192 One declared as a function is really a pointer to a function. */
4194 if (TREE_CODE (type) == ARRAY_TYPE)
4196 /* Transfer const-ness of array into that of type pointed to. */
4197 type = TREE_TYPE (type);
4199 type = c_build_qualified_type (type, type_quals);
4200 type = build_pointer_type (type);
4201 type_quals = TYPE_UNQUALIFIED;
4202 if (array_ptr_quals)
4204 tree new_ptr_quals, new_ptr_attrs;
4206 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4207 /* We don't yet implement attributes in this context. */
4208 if (new_ptr_attrs != NULL_TREE)
4209 warning ("attributes in parameter array declarator ignored");
4214 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4216 tree qualifier = TREE_VALUE (new_ptr_quals);
4218 if (C_IS_RESERVED_WORD (qualifier))
4220 if (C_RID_CODE (qualifier) == RID_CONST)
4222 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4224 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4234 error ("invalid type modifier within array declarator");
4236 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4237 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4238 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4242 else if (TREE_CODE (type) == FUNCTION_TYPE)
4244 if (pedantic && type_quals)
4245 pedwarn ("ISO C forbids qualified function types");
4247 type = c_build_qualified_type (type, type_quals);
4248 type = build_pointer_type (type);
4249 type_quals = TYPE_UNQUALIFIED;
4251 else if (type_quals)
4252 type = c_build_qualified_type (type, type_quals);
4254 type_as_written = type;
4256 decl = build_decl (PARM_DECL, declarator, type);
4258 C_DECL_VARIABLE_SIZE (decl) = 1;
4260 /* Compute the type actually passed in the parmlist,
4261 for the case where there is no prototype.
4262 (For example, shorts and chars are passed as ints.)
4263 When there is a prototype, this is overridden later. */
4265 if (type == error_mark_node)
4266 promoted_type = type;
4268 promoted_type = c_type_promotes_to (type);
4270 DECL_ARG_TYPE (decl) = promoted_type;
4271 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4273 else if (decl_context == FIELD)
4275 /* Structure field. It may not be a function. */
4277 if (TREE_CODE (type) == FUNCTION_TYPE)
4279 error ("field `%s' declared as a function", name);
4280 type = build_pointer_type (type);
4282 else if (TREE_CODE (type) != ERROR_MARK
4283 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4285 error ("field `%s' has incomplete type", name);
4286 type = error_mark_node;
4288 /* Move type qualifiers down to element of an array. */
4289 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4291 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4293 TYPE_DOMAIN (type));
4295 decl = build_decl (FIELD_DECL, declarator, type);
4296 DECL_NONADDRESSABLE_P (decl) = bitfield;
4299 C_DECL_VARIABLE_SIZE (decl) = 1;
4301 else if (TREE_CODE (type) == FUNCTION_TYPE)
4303 /* Every function declaration is "external"
4304 except for those which are inside a function body
4305 in which `auto' is used.
4306 That is a case not specified by ANSI C,
4307 and we use it for forward declarations for nested functions. */
4308 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4309 || current_binding_level == global_binding_level);
4311 if (specbits & (1 << (int) RID_AUTO)
4312 && (pedantic || current_binding_level == global_binding_level))
4313 pedwarn ("invalid storage class for function `%s'", name);
4314 if (specbits & (1 << (int) RID_REGISTER))
4315 error ("invalid storage class for function `%s'", name);
4316 if (specbits & (1 << (int) RID_THREAD))
4317 error ("invalid storage class for function `%s'", name);
4318 /* Function declaration not at top level.
4319 Storage classes other than `extern' are not allowed
4320 and `extern' makes no difference. */
4321 if (current_binding_level != global_binding_level
4322 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4324 pedwarn ("invalid storage class for function `%s'", name);
4326 decl = build_decl (FUNCTION_DECL, declarator, type);
4327 decl = build_decl_attribute_variant (decl, decl_attr);
4329 DECL_LANG_SPECIFIC (decl)
4330 = ggc_alloc_cleared (sizeof (struct lang_decl));
4332 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4333 pedwarn ("ISO C forbids qualified function types");
4335 /* GNU C interprets a `volatile void' return type to indicate
4336 that the function does not return. */
4337 if ((type_quals & TYPE_QUAL_VOLATILE)
4338 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4339 warning ("`noreturn' function returns non-void value");
4342 DECL_EXTERNAL (decl) = 1;
4343 /* Record absence of global scope for `static' or `auto'. */
4345 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4348 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4350 /* Record presence of `inline', if it is reasonable. */
4351 if (MAIN_NAME_P (declarator))
4354 warning ("cannot inline function `main'");
4358 /* Assume that otherwise the function can be inlined. */
4359 DECL_DECLARED_INLINE_P (decl) = 1;
4361 /* Do not mark bare declarations as DECL_INLINE. Doing so
4362 in the presence of multiple declarations can result in
4363 the abstract origin pointing between the declarations,
4364 which will confuse dwarf2out. */
4367 DECL_INLINE (decl) = 1;
4368 if (specbits & (1 << (int) RID_EXTERN))
4369 current_extern_inline = 1;
4372 /* If -finline-functions, assume it can be inlined. This does
4373 two things: let the function be deferred until it is actually
4374 needed, and let dwarf2 know that the function is inlinable. */
4375 else if (flag_inline_trees == 2 && initialized)
4377 if (!DECL_INLINE (decl))
4378 DID_INLINE_FUNC (decl) = 1;
4379 DECL_INLINE (decl) = 1;
4380 DECL_DECLARED_INLINE_P (decl) = 0;
4385 /* It's a variable. */
4386 /* An uninitialized decl with `extern' is a reference. */
4387 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4389 /* Move type qualifiers down to element of an array. */
4390 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4392 int saved_align = TYPE_ALIGN(type);
4393 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4395 TYPE_DOMAIN (type));
4396 TYPE_ALIGN (type) = saved_align;
4398 else if (type_quals)
4399 type = c_build_qualified_type (type, type_quals);
4401 /* It is invalid to create an `extern' declaration for a
4402 variable if there is a global declaration that is
4404 if (extern_ref && current_binding_level != global_binding_level)
4408 global_decl = identifier_global_value (declarator);
4410 && TREE_CODE (global_decl) == VAR_DECL
4411 && !TREE_PUBLIC (global_decl))
4412 error ("variable previously declared `static' redeclared "
4416 decl = build_decl (VAR_DECL, declarator, type);
4418 C_DECL_VARIABLE_SIZE (decl) = 1;
4421 pedwarn ("%Hvariable '%D' declared `inline'",
4422 &DECL_SOURCE_LOCATION (decl), decl);
4424 DECL_EXTERNAL (decl) = extern_ref;
4426 /* At top level, the presence of a `static' or `register' storage
4427 class specifier, or the absence of all storage class specifiers
4428 makes this declaration a definition (perhaps tentative). Also,
4429 the absence of both `static' and `register' makes it public. */
4430 if (current_binding_level == global_binding_level)
4432 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4433 | (1 << (int) RID_REGISTER)));
4434 TREE_STATIC (decl) = !extern_ref;
4436 /* Not at top level, only `static' makes a static definition. */
4439 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4440 TREE_PUBLIC (decl) = extern_ref;
4443 if (specbits & 1 << (int) RID_THREAD)
4445 if (targetm.have_tls)
4446 DECL_THREAD_LOCAL (decl) = 1;
4448 /* A mere warning is sure to result in improper semantics
4449 at runtime. Don't bother to allow this to compile. */
4450 error ("thread-local storage not supported for this target");
4454 /* Record `register' declaration for warnings on &
4455 and in case doing stupid register allocation. */
4457 if (specbits & (1 << (int) RID_REGISTER))
4458 DECL_REGISTER (decl) = 1;
4460 /* Record constancy and volatility. */
4461 c_apply_type_quals_to_decl (type_quals, decl);
4463 /* If a type has volatile components, it should be stored in memory.
4464 Otherwise, the fact that those components are volatile
4465 will be ignored, and would even crash the compiler. */
4466 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4467 c_mark_addressable (decl);
4469 #ifdef ENABLE_CHECKING
4470 /* This is the earliest point at which we might know the assembler
4471 name of a variable. Thus, if it's known before this, die horribly. */
4472 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4476 decl_attributes (&decl, returned_attrs, 0);
4482 /* Decode the parameter-list info for a function type or function definition.
4483 The argument is the value returned by `get_parm_info' (or made in parse.y
4484 if there is an identifier list instead of a parameter decl list).
4485 These two functions are separate because when a function returns
4486 or receives functions then each is called multiple times but the order
4487 of calls is different. The last call to `grokparms' is always the one
4488 that contains the formal parameter names of a function definition.
4490 Store in `last_function_parms' a chain of the decls of parms.
4491 Also store in `last_function_parm_tags' a chain of the struct, union,
4492 and enum tags declared among the parms.
4494 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4496 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4497 a mere declaration. A nonempty identifier-list gets an error message
4498 when FUNCDEF_FLAG is zero. */
4501 grokparms (tree parms_info, int funcdef_flag)
4503 tree first_parm = TREE_CHAIN (parms_info);
4505 last_function_parms = TREE_PURPOSE (parms_info);
4506 last_function_parm_tags = TREE_VALUE (parms_info);
4508 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4509 && !in_system_header)
4510 warning ("function declaration isn't a prototype");
4513 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4516 pedwarn ("parameter names (without types) in function declaration");
4518 last_function_parms = first_parm;
4525 /* If the arg types are incomplete in a declaration,
4526 they must include undefined tags.
4527 These tags can never be defined in the scope of the declaration,
4528 so the types can never be completed,
4529 and no call can be compiled successfully. */
4530 for (parm = last_function_parms, typelt = first_parm;
4532 parm = TREE_CHAIN (parm))
4533 /* Skip over any enumeration constants declared here. */
4534 if (TREE_CODE (parm) == PARM_DECL)
4536 /* Barf if the parameter itself has an incomplete type. */
4537 tree type = TREE_VALUE (typelt);
4538 if (type == error_mark_node)
4540 if (!COMPLETE_TYPE_P (type))
4542 if (funcdef_flag && DECL_NAME (parm) != 0)
4543 error ("parameter `%s' has incomplete type",
4544 IDENTIFIER_POINTER (DECL_NAME (parm)));
4546 warning ("parameter has incomplete type");
4549 TREE_VALUE (typelt) = error_mark_node;
4550 TREE_TYPE (parm) = error_mark_node;
4553 typelt = TREE_CHAIN (typelt);
4560 /* Return a tree_list node with info on a parameter list just parsed.
4561 The TREE_PURPOSE is a chain of decls of those parms.
4562 The TREE_VALUE is a list of structure, union and enum tags defined.
4563 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4564 This tree_list node is later fed to `grokparms'.
4566 VOID_AT_END nonzero means append `void' to the end of the type-list.
4567 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4570 get_parm_info (int void_at_end)
4575 tree tags = gettags ();
4576 tree parms = getdecls ();
4578 tree order = current_binding_level->parm_order;
4580 /* Just `void' (and no ellipsis) is special. There are really no parms.
4581 But if the `void' is qualified (by `const' or `volatile') or has a
4582 storage class specifier (`register'), then the behavior is undefined;
4583 by not counting it as the special case of `void' we will cause an
4584 error later. Typedefs for `void' are OK (see DR#157). */
4585 if (void_at_end && parms != 0
4586 && TREE_CHAIN (parms) == 0
4587 && VOID_TYPE_P (TREE_TYPE (parms))
4588 && ! TREE_THIS_VOLATILE (parms)
4589 && ! TREE_READONLY (parms)
4590 && ! DECL_REGISTER (parms)
4591 && DECL_NAME (parms) == 0)
4594 storedecls (NULL_TREE);
4595 return tree_cons (NULL_TREE, NULL_TREE,
4596 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4599 /* Extract enumerator values and other non-parms declared with the parms.
4600 Likewise any forward parm decls that didn't have real parm decls. */
4601 for (decl = parms; decl;)
4603 tree next = TREE_CHAIN (decl);
4605 if (TREE_CODE (decl) != PARM_DECL)
4607 TREE_CHAIN (decl) = new_parms;
4610 else if (TREE_ASM_WRITTEN (decl))
4612 error ("%Hparameter '%D' has just a forward declaration",
4613 &DECL_SOURCE_LOCATION (decl), decl);
4614 TREE_CHAIN (decl) = new_parms;
4620 /* Put the parm decls back in the order they were in in the parm list. */
4621 for (t = order; t; t = TREE_CHAIN (t))
4624 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4626 TREE_CHAIN (TREE_VALUE (t)) = 0;
4629 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4632 /* Store the parmlist in the binding level since the old one
4633 is no longer a valid list. (We have changed the chain pointers.) */
4634 storedecls (new_parms);
4636 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4637 /* There may also be declarations for enumerators if an enumeration
4638 type is declared among the parms. Ignore them here. */
4639 if (TREE_CODE (decl) == PARM_DECL)
4641 /* Since there is a prototype,
4642 args are passed in their declared types. */
4643 tree type = TREE_TYPE (decl);
4644 DECL_ARG_TYPE (decl) = type;
4645 if (PROMOTE_PROTOTYPES
4646 && INTEGRAL_TYPE_P (type)
4647 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4648 DECL_ARG_TYPE (decl) = integer_type_node;
4650 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4651 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
4652 && DECL_NAME (decl) == 0)
4654 error ("`void' in parameter list must be the entire list");
4660 return tree_cons (new_parms, tags,
4661 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
4663 return tree_cons (new_parms, tags, nreverse (types));
4666 /* At end of parameter list, warn about any struct, union or enum tags
4667 defined within. Do so because these types cannot ever become complete. */
4670 parmlist_tags_warning (void)
4675 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4677 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4678 /* An anonymous union parm type is meaningful as a GNU extension.
4679 So don't warn for that. */
4680 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
4682 if (TREE_PURPOSE (elt) != 0)
4684 if (code == RECORD_TYPE)
4685 warning ("`struct %s' declared inside parameter list",
4686 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4687 else if (code == UNION_TYPE)
4688 warning ("`union %s' declared inside parameter list",
4689 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4691 warning ("`enum %s' declared inside parameter list",
4692 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4696 /* For translation these need to be separate warnings */
4697 if (code == RECORD_TYPE)
4698 warning ("anonymous struct declared inside parameter list");
4699 else if (code == UNION_TYPE)
4700 warning ("anonymous union declared inside parameter list");
4702 warning ("anonymous enum declared inside parameter list");
4706 warning ("its scope is only this definition or declaration, which is probably not what you want");
4712 /* Get the struct, enum or union (CODE says which) with tag NAME.
4713 Define the tag as a forward-reference if it is not defined. */
4716 xref_tag (enum tree_code code, tree name)
4718 /* If a cross reference is requested, look up the type
4719 already defined for this tag and return it. */
4721 tree ref = lookup_tag (code, name, 0);
4722 /* If this is the right type of tag, return what we found.
4723 (This reference will be shadowed by shadow_tag later if appropriate.)
4724 If this is the wrong type of tag, do not return it. If it was the
4725 wrong type in the same binding level, we will have had an error
4726 message already; if in a different binding level and declaring
4727 a name, pending_xref_error will give an error message; but if in a
4728 different binding level and not declaring a name, this tag should
4729 shadow the previous declaration of a different type of tag, and
4730 this would not work properly if we return the reference found.
4731 (For example, with "struct foo" in an outer scope, "union foo;"
4732 must shadow that tag with a new one of union type.) */
4733 if (ref && TREE_CODE (ref) == code)
4736 /* If no such tag is yet defined, create a forward-reference node
4737 and record it as the "definition".
4738 When a real declaration of this type is found,
4739 the forward-reference will be altered into a real type. */
4741 ref = make_node (code);
4742 if (code == ENUMERAL_TYPE)
4744 /* Give the type a default layout like unsigned int
4745 to avoid crashing if it does not get defined. */
4746 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4747 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4748 TYPE_USER_ALIGN (ref) = 0;
4749 TREE_UNSIGNED (ref) = 1;
4750 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4751 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4752 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4755 pushtag (name, ref);
4760 /* Make sure that the tag NAME is defined *in the current binding level*
4761 at least as a forward reference.
4762 CODE says which kind of tag NAME ought to be. */
4765 start_struct (enum tree_code code, tree name)
4767 /* If there is already a tag defined at this binding level
4768 (as a forward reference), just return it. */
4773 ref = lookup_tag (code, name, 1);
4774 if (ref && TREE_CODE (ref) == code)
4776 if (TYPE_FIELDS (ref))
4778 if (code == UNION_TYPE)
4779 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4781 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4786 /* Otherwise create a forward-reference just so the tag is in scope. */
4788 ref = make_node (code);
4789 pushtag (name, ref);
4792 C_TYPE_BEING_DEFINED (ref) = 1;
4793 TYPE_PACKED (ref) = flag_pack_struct;
4797 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4798 of a structure component, returning a FIELD_DECL node.
4799 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4801 This is done during the parsing of the struct declaration.
4802 The FIELD_DECL nodes are chained together and the lot of them
4803 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4806 grokfield (tree declarator, tree declspecs, tree width)
4810 if (declarator == NULL_TREE && width == NULL_TREE)
4812 /* This is an unnamed decl.
4814 If we have something of the form "union { list } ;" then this
4815 is the anonymous union extension. Similarly for struct.
4817 If this is something of the form "struct foo;", then
4818 If MS extensions are enabled, this is handled as an
4820 Otherwise this is a forward declaration of a structure tag.
4822 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4823 If MS extensions are enabled and foo names a structure, then
4824 again this is an anonymous struct.
4825 Otherwise this is an error.
4827 Oh what a horrid tangled web we weave. I wonder if MS consciously
4828 took this from Plan 9 or if it was an accident of implementation
4829 that took root before someone noticed the bug... */
4831 tree type = TREE_VALUE (declspecs);
4833 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4834 type = TREE_TYPE (type);
4835 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4837 if (flag_ms_extensions)
4840 goto warn_unnamed_field;
4841 else if (TYPE_NAME (type) == NULL)
4844 goto warn_unnamed_field;
4849 warning ("declaration does not declare anything");
4854 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4856 finish_decl (value, NULL_TREE, NULL_TREE);
4857 DECL_INITIAL (value) = width;
4859 if (c_dialect_objc ())
4860 objc_check_decl (value);
4864 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4865 the list such that this does not present a problem later. */
4868 detect_field_duplicates (tree fieldlist)
4873 /* First, see if there are more than "a few" fields.
4874 This is trivially true if there are zero or one fields. */
4877 x = TREE_CHAIN (fieldlist);
4883 } while (timeout > 0 && x);
4885 /* If there were "few" fields, avoid the overhead of allocating
4886 a hash table. Instead just do the nested traversal thing. */
4889 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4892 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4893 if (DECL_NAME (y) == DECL_NAME (x))
4895 error ("%Hduplicate member '%D'",
4896 &DECL_SOURCE_LOCATION (x), x);
4897 DECL_NAME (x) = NULL_TREE;
4903 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4906 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4907 if ((y = DECL_NAME (x)) != 0)
4909 slot = htab_find_slot (htab, y, INSERT);
4912 error ("%Hduplicate member '%D'",
4913 &DECL_SOURCE_LOCATION (x), x);
4914 DECL_NAME (x) = NULL_TREE;
4923 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4924 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4925 ATTRIBUTES are attributes to be applied to the structure. */
4928 finish_struct (tree t, tree fieldlist, tree attributes)
4931 int toplevel = global_binding_level == current_binding_level;
4932 int saw_named_field;
4934 /* If this type was previously laid out as a forward reference,
4935 make sure we lay it out again. */
4939 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4941 /* Nameless union parm types are useful as GCC extension. */
4942 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4943 /* Otherwise, warn about any struct or union def. in parmlist. */
4944 if (in_parm_level_p ())
4947 pedwarn ("%s defined inside parms",
4948 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4950 warning ("%s defined inside parms",
4951 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4956 for (x = fieldlist; x; x = TREE_CHAIN (x))
4957 if (DECL_NAME (x) != 0)
4961 pedwarn ("%s has no %s",
4962 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4963 fieldlist ? _("named members") : _("members"));
4966 /* Install struct as DECL_CONTEXT of each field decl.
4967 Also process specified field sizes,m which is found in the DECL_INITIAL.
4968 Store 0 there, except for ": 0" fields (so we can find them
4969 and delete them, below). */
4971 saw_named_field = 0;
4972 for (x = fieldlist; x; x = TREE_CHAIN (x))
4974 DECL_CONTEXT (x) = t;
4975 DECL_PACKED (x) |= TYPE_PACKED (t);
4977 /* If any field is const, the structure type is pseudo-const. */
4978 if (TREE_READONLY (x))
4979 C_TYPE_FIELDS_READONLY (t) = 1;
4982 /* A field that is pseudo-const makes the structure likewise. */
4983 tree t1 = TREE_TYPE (x);
4984 while (TREE_CODE (t1) == ARRAY_TYPE)
4985 t1 = TREE_TYPE (t1);
4986 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4987 && C_TYPE_FIELDS_READONLY (t1))
4988 C_TYPE_FIELDS_READONLY (t) = 1;
4991 /* Any field that is volatile means variables of this type must be
4992 treated in some ways as volatile. */
4993 if (TREE_THIS_VOLATILE (x))
4994 C_TYPE_FIELDS_VOLATILE (t) = 1;
4996 /* Any field of nominal variable size implies structure is too. */
4997 if (C_DECL_VARIABLE_SIZE (x))
4998 C_TYPE_VARIABLE_SIZE (t) = 1;
5000 /* Detect invalid nested redefinition. */
5001 if (TREE_TYPE (x) == t)
5002 error ("nested redefinition of `%s'",
5003 IDENTIFIER_POINTER (TYPE_NAME (t)));
5005 /* Detect invalid bit-field size. */
5006 if (DECL_INITIAL (x))
5007 STRIP_NOPS (DECL_INITIAL (x));
5008 if (DECL_INITIAL (x))
5010 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5011 constant_expression_warning (DECL_INITIAL (x));
5014 error ("%Hbit-field '%D' width not an integer constant",
5015 &DECL_SOURCE_LOCATION (x), x);
5016 DECL_INITIAL (x) = NULL;
5020 /* Detect invalid bit-field type. */
5021 if (DECL_INITIAL (x)
5022 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5023 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5024 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5026 error ("%Hbit-field '%D' has invalid type",
5027 &DECL_SOURCE_LOCATION (x), x);
5028 DECL_INITIAL (x) = NULL;
5031 if (DECL_INITIAL (x) && pedantic
5032 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5033 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5034 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5035 /* Accept an enum that's equivalent to int or unsigned int. */
5036 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5037 && (TYPE_PRECISION (TREE_TYPE (x))
5038 == TYPE_PRECISION (integer_type_node))))
5039 pedwarn ("%Hbit-field '%D' type invalid in ISO C",
5040 &DECL_SOURCE_LOCATION (x), x);
5042 /* Detect and ignore out of range field width and process valid
5044 if (DECL_INITIAL (x))
5047 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
5048 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5050 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5051 error ("%Hnegative width in bit-field '%D'",
5052 &DECL_SOURCE_LOCATION (x), x);
5053 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5054 pedwarn ("%Hwidth of '%D' exceeds its type",
5055 &DECL_SOURCE_LOCATION (x), x);
5056 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5057 error ("%Hzero width for bit-field '%D'",
5058 &DECL_SOURCE_LOCATION (x), x);
5061 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5062 unsigned HOST_WIDE_INT width
5063 = tree_low_cst (DECL_INITIAL (x), 1);
5065 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5066 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5067 TREE_UNSIGNED (TREE_TYPE (x)))
5069 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5070 TREE_UNSIGNED (TREE_TYPE (x))))))
5071 warning ("%H'%D' is narrower than values of its type",
5072 &DECL_SOURCE_LOCATION (x), x);
5074 DECL_SIZE (x) = bitsize_int (width);
5075 DECL_BIT_FIELD (x) = 1;
5076 SET_DECL_C_BIT_FIELD (x);
5080 DECL_INITIAL (x) = 0;
5082 /* Detect flexible array member in an invalid context. */
5083 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5084 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5085 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5086 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5088 if (TREE_CODE (t) == UNION_TYPE)
5089 error ("%Hflexible array member in union",
5090 &DECL_SOURCE_LOCATION (x));
5091 else if (TREE_CHAIN (x) != NULL_TREE)
5092 error ("%Hflexible array member not at end of struct",
5093 &DECL_SOURCE_LOCATION (x));
5094 else if (! saw_named_field)
5095 error ("%Hflexible array member in otherwise empty struct",
5096 &DECL_SOURCE_LOCATION (x));
5099 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5100 && flexible_array_type_p (TREE_TYPE (x)))
5101 pedwarn ("%Hinvalid use of structure with flexible array member",
5102 &DECL_SOURCE_LOCATION (x));
5105 saw_named_field = 1;
5108 detect_field_duplicates (fieldlist);
5110 /* Now we have the nearly final fieldlist. Record it,
5111 then lay out the structure or union (including the fields). */
5113 TYPE_FIELDS (t) = fieldlist;
5117 /* Delete all zero-width bit-fields from the fieldlist */
5119 tree *fieldlistp = &fieldlist;
5121 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5122 *fieldlistp = TREE_CHAIN (*fieldlistp);
5124 fieldlistp = &TREE_CHAIN (*fieldlistp);
5127 /* Now we have the truly final field list.
5128 Store it in this type and in the variants. */
5130 TYPE_FIELDS (t) = fieldlist;
5132 /* If there are lots of fields, sort so we can look through them fast.
5133 We arbitrarily consider 16 or more elts to be "a lot". */
5138 for (x = fieldlist; x; x = TREE_CHAIN (x))
5140 if (len > 15 || DECL_NAME (x) == NULL)
5148 struct lang_type *space;
5149 struct sorted_fields_type *space2;
5151 len += list_length (x);
5153 /* Use the same allocation policy here that make_node uses, to
5154 ensure that this lives as long as the rest of the struct decl.
5155 All decls in an inline function need to be saved. */
5157 space = ggc_alloc (sizeof (struct lang_type));
5158 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5162 field_array = &space2->elts[0];
5163 for (x = fieldlist; x; x = TREE_CHAIN (x))
5165 field_array[len++] = x;
5167 /* if there is anonymous struct or union break out of the loop */
5168 if (DECL_NAME (x) == NULL)
5171 /* found no anonymous struct/union add the TYPE_LANG_SPECIFIC. */
5174 TYPE_LANG_SPECIFIC (t) = space;
5175 TYPE_LANG_SPECIFIC (t)->s->len = len;
5176 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5177 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5182 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5184 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5185 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5186 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5187 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5190 /* If this was supposed to be a transparent union, but we can't
5191 make it one, warn and turn off the flag. */
5192 if (TREE_CODE (t) == UNION_TYPE
5193 && TYPE_TRANSPARENT_UNION (t)
5194 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5196 TYPE_TRANSPARENT_UNION (t) = 0;
5197 warning ("union cannot be made transparent");
5200 /* If this structure or union completes the type of any previous
5201 variable declaration, lay it out and output its rtl. */
5203 if (current_binding_level->incomplete_list != NULL_TREE)
5205 tree prev = NULL_TREE;
5207 for (x = current_binding_level->incomplete_list; x; x = TREE_CHAIN (x))
5209 tree decl = TREE_VALUE (x);
5211 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5212 && TREE_CODE (decl) != TYPE_DECL)
5214 layout_decl (decl, 0);
5215 /* This is a no-op in c-lang.c or something real in objc-act.c. */
5216 if (c_dialect_objc ())
5217 objc_check_decl (decl);
5218 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5221 /* Unlink X from the incomplete list. */
5223 TREE_CHAIN (prev) = TREE_CHAIN (x);
5225 current_binding_level->incomplete_list = TREE_CHAIN (x);
5227 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5228 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5230 tree element = TREE_TYPE (decl);
5231 while (TREE_CODE (element) == ARRAY_TYPE)
5232 element = TREE_TYPE (element);
5235 layout_array_type (TREE_TYPE (decl));
5236 if (TREE_CODE (decl) != TYPE_DECL)
5238 layout_decl (decl, 0);
5239 if (c_dialect_objc ())
5240 objc_check_decl (decl);
5241 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5245 /* Unlink X from the incomplete list. */
5247 TREE_CHAIN (prev) = TREE_CHAIN (x);
5249 current_binding_level->incomplete_list = TREE_CHAIN (x);
5255 /* Finish debugging output for this type. */
5256 rest_of_type_compilation (t, toplevel);
5261 /* Lay out the type T, and its element type, and so on. */
5264 layout_array_type (tree t)
5266 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5267 layout_array_type (TREE_TYPE (t));
5271 /* Begin compiling the definition of an enumeration type.
5272 NAME is its name (or null if anonymous).
5273 Returns the type object, as yet incomplete.
5274 Also records info about it so that build_enumerator
5275 may be used to declare the individual values as they are read. */
5278 start_enum (tree name)
5282 /* If this is the real definition for a previous forward reference,
5283 fill in the contents in the same object that used to be the
5284 forward reference. */
5287 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5289 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5291 enumtype = make_node (ENUMERAL_TYPE);
5292 pushtag (name, enumtype);
5295 C_TYPE_BEING_DEFINED (enumtype) = 1;
5297 if (TYPE_VALUES (enumtype) != 0)
5299 /* This enum is a named one that has been declared already. */
5300 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5302 /* Completely replace its old definition.
5303 The old enumerators remain defined, however. */
5304 TYPE_VALUES (enumtype) = 0;
5307 enum_next_value = integer_zero_node;
5310 if (flag_short_enums)
5311 TYPE_PACKED (enumtype) = 1;
5316 /* After processing and defining all the values of an enumeration type,
5317 install their decls in the enumeration type and finish it off.
5318 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5319 and ATTRIBUTES are the specified attributes.
5320 Returns ENUMTYPE. */
5323 finish_enum (tree enumtype, tree values, tree attributes)
5326 tree minnode = 0, maxnode = 0, enum_value_type;
5327 int precision, unsign;
5328 int toplevel = (global_binding_level == current_binding_level);
5330 if (in_parm_level_p ())
5331 warning ("enum defined inside parms");
5333 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5335 /* Calculate the maximum value of any enumerator in this type. */
5337 if (values == error_mark_node)
5338 minnode = maxnode = integer_zero_node;
5341 minnode = maxnode = TREE_VALUE (values);
5342 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5344 tree value = TREE_VALUE (pair);
5345 if (tree_int_cst_lt (maxnode, value))
5347 if (tree_int_cst_lt (value, minnode))
5352 /* Construct the final type of this enumeration. It is the same
5353 as one of the integral types - the narrowest one that fits, except
5354 that normally we only go as narrow as int - and signed iff any of
5355 the values are negative. */
5356 unsign = (tree_int_cst_sgn (minnode) >= 0);
5357 precision = MAX (min_precision (minnode, unsign),
5358 min_precision (maxnode, unsign));
5359 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5361 tree narrowest = c_common_type_for_size (precision, unsign);
5364 warning ("enumeration values exceed range of largest integer");
5365 narrowest = long_long_integer_type_node;
5368 precision = TYPE_PRECISION (narrowest);
5371 precision = TYPE_PRECISION (integer_type_node);
5373 if (precision == TYPE_PRECISION (integer_type_node))
5374 enum_value_type = c_common_type_for_size (precision, 0);
5376 enum_value_type = enumtype;
5378 TYPE_MIN_VALUE (enumtype) = minnode;
5379 TYPE_MAX_VALUE (enumtype) = maxnode;
5380 TYPE_PRECISION (enumtype) = precision;
5381 TREE_UNSIGNED (enumtype) = unsign;
5382 TYPE_SIZE (enumtype) = 0;
5383 layout_type (enumtype);
5385 if (values != error_mark_node)
5387 /* Change the type of the enumerators to be the enum type. We
5388 need to do this irrespective of the size of the enum, for
5389 proper type checking. Replace the DECL_INITIALs of the
5390 enumerators, and the value slots of the list, with copies
5391 that have the enum type; they cannot be modified in place
5392 because they may be shared (e.g. integer_zero_node) Finally,
5393 change the purpose slots to point to the names of the decls. */
5394 for (pair = values; pair; pair = TREE_CHAIN (pair))
5396 tree enu = TREE_PURPOSE (pair);
5398 TREE_TYPE (enu) = enumtype;
5400 /* The ISO C Standard mandates enumerators to have type int,
5401 even though the underlying type of an enum type is
5402 unspecified. Here we convert any enumerators that fit in
5403 an int to type int, to avoid promotions to unsigned types
5404 when comparing integers with enumerators that fit in the
5405 int range. When -pedantic is given, build_enumerator()
5406 would have already taken care of those that don't fit. */
5407 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5408 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5410 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5412 TREE_PURPOSE (pair) = DECL_NAME (enu);
5413 TREE_VALUE (pair) = DECL_INITIAL (enu);
5416 TYPE_VALUES (enumtype) = values;
5419 /* Fix up all variant types of this enum type. */
5420 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5422 if (tem == enumtype)
5424 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5425 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5426 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5427 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5428 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5429 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5430 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5431 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5432 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5433 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5436 /* Finish debugging output for this type. */
5437 rest_of_type_compilation (enumtype, toplevel);
5442 /* Build and install a CONST_DECL for one value of the
5443 current enumeration type (one that was begun with start_enum).
5444 Return a tree-list containing the CONST_DECL and its value.
5445 Assignment of sequential values by default is handled here. */
5448 build_enumerator (tree name, tree value)
5452 /* Validate and default VALUE. */
5454 /* Remove no-op casts from the value. */
5456 STRIP_TYPE_NOPS (value);
5460 if (TREE_CODE (value) == INTEGER_CST)
5462 value = default_conversion (value);
5463 constant_expression_warning (value);
5467 error ("enumerator value for `%s' not integer constant",
5468 IDENTIFIER_POINTER (name));
5473 /* Default based on previous value. */
5474 /* It should no longer be possible to have NON_LVALUE_EXPR
5478 value = enum_next_value;
5480 error ("overflow in enumeration values");
5483 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5485 pedwarn ("ISO C restricts enumerator values to range of `int'");
5486 value = convert (integer_type_node, value);
5489 /* Set basis for default for next value. */
5490 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5491 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5493 /* Now create a declaration for the enum value name. */
5495 type = TREE_TYPE (value);
5496 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5497 TYPE_PRECISION (integer_type_node)),
5498 (TYPE_PRECISION (type)
5499 >= TYPE_PRECISION (integer_type_node)
5500 && TREE_UNSIGNED (type)));
5502 decl = build_decl (CONST_DECL, name, type);
5503 DECL_INITIAL (decl) = convert (type, value);
5506 return tree_cons (decl, value, NULL_TREE);
5510 /* Create the FUNCTION_DECL for a function definition.
5511 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5512 the declaration; they describe the function's name and the type it returns,
5513 but twisted together in a fashion that parallels the syntax of C.
5515 This function creates a binding context for the function body
5516 as well as setting up the FUNCTION_DECL in current_function_decl.
5518 Returns 1 on success. If the DECLARATOR is not suitable for a function
5519 (it defines a datum instead), we return 0, which tells
5520 yyparse to report a parse error. */
5523 start_function (tree declspecs, tree declarator, tree attributes)
5525 tree decl1, old_decl;
5527 int old_immediate_size_expand = immediate_size_expand;
5529 current_function_returns_value = 0; /* Assume, until we see it does. */
5530 current_function_returns_null = 0;
5531 current_function_returns_abnormally = 0;
5532 warn_about_return_type = 0;
5533 current_extern_inline = 0;
5535 /* Don't expand any sizes in the return type of the function. */
5536 immediate_size_expand = 0;
5538 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5540 /* If the declarator is not suitable for a function definition,
5541 cause a syntax error. */
5544 immediate_size_expand = old_immediate_size_expand;
5548 decl_attributes (&decl1, attributes, 0);
5550 if (DECL_DECLARED_INLINE_P (decl1)
5551 && DECL_UNINLINABLE (decl1)
5552 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5553 warning ("%Hinline function '%D' given attribute noinline",
5554 &DECL_SOURCE_LOCATION (decl1), decl1);
5556 announce_function (decl1);
5558 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5560 error ("return type is an incomplete type");
5561 /* Make it return void instead. */
5563 = build_function_type (void_type_node,
5564 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5567 if (warn_about_return_type)
5568 pedwarn_c99 ("return type defaults to `int'");
5570 /* Save the parm names or decls from this function's declarator
5571 where store_parm_decls will find them. */
5572 current_function_parms = last_function_parms;
5573 current_function_parm_tags = last_function_parm_tags;
5575 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5576 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5577 DECL_INITIAL (decl1) = error_mark_node;
5579 /* If this definition isn't a prototype and we had a prototype declaration
5580 before, copy the arg type info from that prototype.
5581 But not if what we had before was a builtin function. */
5582 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5583 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5584 && !DECL_BUILT_IN (old_decl)
5585 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5586 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5587 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5589 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5590 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5593 /* Optionally warn of old-fashioned def with no previous prototype. */
5594 if (warn_strict_prototypes
5595 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5596 && C_DECL_ISNT_PROTOTYPE (old_decl))
5597 warning ("function declaration isn't a prototype");
5598 /* Optionally warn of any global def with no previous prototype. */
5599 else if (warn_missing_prototypes
5600 && TREE_PUBLIC (decl1)
5601 && ! MAIN_NAME_P (DECL_NAME (decl1))
5602 && C_DECL_ISNT_PROTOTYPE (old_decl))
5603 warning ("%Hno previous prototype for '%D'",
5604 &DECL_SOURCE_LOCATION (decl1), decl1);
5605 /* Optionally warn of any def with no previous prototype
5606 if the function has already been used. */
5607 else if (warn_missing_prototypes
5608 && old_decl != 0 && TREE_USED (old_decl)
5609 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5610 warning ("%H'%D' was used with no prototype before its definition",
5611 &DECL_SOURCE_LOCATION (decl1), decl1);
5612 /* Optionally warn of any global def with no previous declaration. */
5613 else if (warn_missing_declarations
5614 && TREE_PUBLIC (decl1)
5616 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5617 warning ("%Hno previous declaration for '%D'",
5618 &DECL_SOURCE_LOCATION (decl1), decl1);
5619 /* Optionally warn of any def with no previous declaration
5620 if the function has already been used. */
5621 else if (warn_missing_declarations
5622 && old_decl != 0 && TREE_USED (old_decl)
5623 && C_DECL_IMPLICIT (old_decl))
5624 warning ("%H`%D' was used with no declaration before its definition",
5625 &DECL_SOURCE_LOCATION (decl1), decl1);
5627 /* This is a definition, not a reference.
5628 So normally clear DECL_EXTERNAL.
5629 However, `extern inline' acts like a declaration
5630 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5631 DECL_EXTERNAL (decl1) = current_extern_inline;
5633 /* This function exists in static storage.
5634 (This does not mean `static' in the C sense!) */
5635 TREE_STATIC (decl1) = 1;
5637 /* A nested function is not global. */
5638 if (current_function_decl != 0)
5639 TREE_PUBLIC (decl1) = 0;
5641 #ifdef ENABLE_CHECKING
5642 /* This is the earliest point at which we might know the assembler
5643 name of the function. Thus, if it's set before this, die horribly. */
5644 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5648 /* If #pragma weak was used, mark the decl weak now. */
5649 if (current_binding_level == global_binding_level)
5650 maybe_apply_pragma_weak (decl1);
5652 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5653 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5657 const location_t *locus = &DECL_SOURCE_LOCATION (decl1);
5659 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5660 != integer_type_node)
5661 pedwarn ("%Hreturn type of '%D' is not `int'", locus, decl1);
5663 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5664 args = TREE_CHAIN (args))
5666 tree type = args ? TREE_VALUE (args) : 0;
5668 if (type == void_type_node)
5675 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5676 pedwarn ("%Hfirst argument of '%D' should be `int'",
5681 if (TREE_CODE (type) != POINTER_TYPE
5682 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5683 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5685 pedwarn ("%Hsecond argument of '%D' should be 'char **'",
5690 if (TREE_CODE (type) != POINTER_TYPE
5691 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5692 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5694 pedwarn ("%Hthird argument of '%D' should probably be "
5695 "'char **'", locus, decl1);
5700 /* It is intentional that this message does not mention the third
5701 argument because it's only mentioned in an appendix of the
5703 if (argct > 0 && (argct < 2 || argct > 3))
5704 pedwarn ("%H'%D' takes only zero or two arguments", locus, decl1);
5706 if (! TREE_PUBLIC (decl1))
5707 pedwarn ("%H'%D' is normally a non-static function", locus, decl1);
5710 /* Record the decl so that the function name is defined.
5711 If we already have a decl for this name, and it is a FUNCTION_DECL,
5712 use the old decl. */
5714 current_function_decl = pushdecl (decl1);
5717 declare_parm_level ();
5719 make_decl_rtl (current_function_decl, NULL);
5721 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5722 /* Promote the value to int before returning it. */
5723 if (c_promoting_integer_type_p (restype))
5725 /* It retains unsignedness if not really getting wider. */
5726 if (TREE_UNSIGNED (restype)
5727 && (TYPE_PRECISION (restype)
5728 == TYPE_PRECISION (integer_type_node)))
5729 restype = unsigned_type_node;
5731 restype = integer_type_node;
5733 DECL_RESULT (current_function_decl)
5734 = build_decl (RESULT_DECL, NULL_TREE, restype);
5736 /* If this fcn was already referenced via a block-scope `extern' decl
5737 (or an implicit decl), propagate certain information about the usage. */
5738 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5739 TREE_ADDRESSABLE (current_function_decl) = 1;
5741 immediate_size_expand = old_immediate_size_expand;
5743 start_fname_decls ();
5748 /* Store the parameter declarations into the current function declaration.
5749 This is called after parsing the parameter declarations, before
5750 digesting the body of the function.
5752 For an old-style definition, modify the function's type
5753 to specify at least the number of arguments. */
5756 store_parm_decls (void)
5758 tree fndecl = current_function_decl;
5761 /* This is either a chain of PARM_DECLs (if a prototype was used)
5762 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5763 tree specparms = current_function_parms;
5765 /* This is a list of types declared among parms in a prototype. */
5766 tree parmtags = current_function_parm_tags;
5768 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5769 tree parmdecls = getdecls ();
5771 /* This is a chain of any other decls that came in among the parm
5772 declarations. If a parm is declared with enum {foo, bar} x;
5773 then CONST_DECLs for foo and bar are put here. */
5776 /* The function containing FNDECL, if any. */
5777 tree context = decl_function_context (fndecl);
5779 /* Nonzero if this definition is written with a prototype. */
5782 bool saved_warn_shadow = warn_shadow;
5784 /* Don't re-emit shadow warnings. */
5785 warn_shadow = false;
5787 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5789 /* This case is when the function was defined with an ANSI prototype.
5790 The parms already have decls, so we need not do anything here
5791 except record them as in effect
5792 and complain if any redundant old-style parm decls were written. */
5803 error ("%Hparm types given both in parmlist and separately",
5804 &DECL_SOURCE_LOCATION (fndecl));
5805 /* Get rid of the erroneous decls; don't keep them on
5806 the list of parms, since they might not be PARM_DECLs. */
5807 for (decl = current_binding_level->names;
5808 decl; decl = TREE_CHAIN (decl))
5809 if (DECL_NAME (decl))
5810 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = 0;
5811 for (link = current_binding_level->shadowed;
5812 link; link = TREE_CHAIN (link))
5813 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5814 current_binding_level->names = 0;
5815 current_binding_level->shadowed = 0;
5818 specparms = nreverse (specparms);
5819 for (parm = specparms; parm; parm = next)
5821 const location_t *locus = &DECL_SOURCE_LOCATION (parm);
5822 next = TREE_CHAIN (parm);
5823 if (TREE_CODE (parm) == PARM_DECL)
5825 if (DECL_NAME (parm) == 0)
5826 error ("%Hparameter name omitted", locus);
5827 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
5828 && VOID_TYPE_P (TREE_TYPE (parm)))
5830 error ("%Hparameter '%D' declared void", locus, parm);
5831 /* Change the type to error_mark_node so this parameter
5832 will be ignored by assign_parms. */
5833 TREE_TYPE (parm) = error_mark_node;
5839 /* If we find an enum constant or a type tag,
5840 put it aside for the moment. */
5841 TREE_CHAIN (parm) = 0;
5842 others = chainon (others, parm);
5846 /* Get the decls in their original chain order
5847 and record in the function. */
5848 DECL_ARGUMENTS (fndecl) = getdecls ();
5850 /* Now pushdecl the enum constants. */
5851 for (parm = others; parm; parm = next)
5853 next = TREE_CHAIN (parm);
5854 if (DECL_NAME (parm) == 0)
5856 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5858 else if (TREE_CODE (parm) != PARM_DECL)
5862 storetags (chainon (parmtags, gettags ()));
5866 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5867 each with a parm name as the TREE_VALUE.
5869 PARMDECLS is a chain of declarations for parameters.
5870 Warning! It can also contain CONST_DECLs which are not parameters
5871 but are names of enumerators of any enum types
5872 declared among the parameters.
5874 First match each formal parameter name with its declaration.
5875 Associate decls with the names and store the decls
5876 into the TREE_PURPOSE slots. */
5878 /* We use DECL_WEAK as a flag to show which parameters have been
5879 seen already since it is not used on PARM_DECL or CONST_DECL. */
5880 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5881 DECL_WEAK (parm) = 0;
5883 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5885 tree tail, found = NULL;
5887 if (TREE_VALUE (parm) == 0)
5889 error ("%Hparameter name missing from parameter list",
5890 &DECL_SOURCE_LOCATION (fndecl));
5891 TREE_PURPOSE (parm) = 0;
5895 /* See if any of the parmdecls specifies this parm by name.
5896 Ignore any enumerator decls. */
5897 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5898 if (DECL_NAME (tail) == TREE_VALUE (parm)
5899 && TREE_CODE (tail) == PARM_DECL)
5905 /* If declaration already marked, we have a duplicate name.
5906 Complain, and don't use this decl twice. */
5907 if (found && DECL_WEAK (found))
5909 error ("%Hmultiple parameters named '%D'",
5910 &DECL_SOURCE_LOCATION (found), found);
5914 /* If the declaration says "void", complain and ignore it. */
5915 if (found && VOID_TYPE_P (TREE_TYPE (found)))
5917 error ("%Hparameter '%D' declared void",
5918 &DECL_SOURCE_LOCATION (found), found);
5919 TREE_TYPE (found) = integer_type_node;
5920 DECL_ARG_TYPE (found) = integer_type_node;
5921 layout_decl (found, 0);
5924 /* If no declaration found, default to int. */
5927 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5929 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5930 DECL_SOURCE_LOCATION (found) = DECL_SOURCE_LOCATION (fndecl);
5932 pedwarn ("%Htype of '%D' defaults to `int'",
5933 &DECL_SOURCE_LOCATION (found), found);
5934 else if (extra_warnings)
5935 warning ("%Htype of '%D' defaults to `int'",
5936 &DECL_SOURCE_LOCATION (found), found);
5940 TREE_PURPOSE (parm) = found;
5942 /* Mark this decl as "already found". */
5943 DECL_WEAK (found) = 1;
5946 /* Put anything which is on the parmdecls chain and which is
5947 not a PARM_DECL onto the list NONPARMS. (The types of
5948 non-parm things which might appear on the list include
5949 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5950 any actual PARM_DECLs not matched with any names. */
5953 for (parm = parmdecls; parm;)
5955 const location_t *locus = &DECL_SOURCE_LOCATION (parm);
5956 tree next = TREE_CHAIN (parm);
5957 TREE_CHAIN (parm) = 0;
5959 if (TREE_CODE (parm) != PARM_DECL)
5960 nonparms = chainon (nonparms, parm);
5963 /* Complain about args with incomplete types. */
5964 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5966 error ("%Hparameter '%D' has incomplete type", locus, parm);
5967 TREE_TYPE (parm) = error_mark_node;
5970 if (! DECL_WEAK (parm))
5972 error ("%Hdeclaration for parameter '%D' but no such "
5973 "parameter", locus, parm);
5974 /* Pretend the parameter was not missing.
5975 This gets us to a standard state and minimizes
5976 further error messages. */
5978 = chainon (specparms,
5979 tree_cons (parm, NULL_TREE, NULL_TREE));
5986 /* Chain the declarations together in the order of the list of
5987 names. Store that chain in the function decl, replacing the
5990 DECL_ARGUMENTS (fndecl) = 0;
5993 for (last = 0; parm; parm = TREE_CHAIN (parm))
5994 if (TREE_PURPOSE (parm))
5997 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
5999 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6000 last = TREE_PURPOSE (parm);
6001 TREE_CHAIN (last) = 0;
6005 /* If there was a previous prototype,
6006 set the DECL_ARG_TYPE of each argument according to
6007 the type previously specified, and report any mismatches. */
6009 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6012 for (parm = DECL_ARGUMENTS (fndecl),
6013 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6014 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6015 != void_type_node));
6016 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6018 if (parm == 0 || type == 0
6019 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6021 error ("number of arguments doesn't match prototype");
6022 error ("%Hprototype declaration",
6023 ¤t_function_prototype_locus);
6026 /* Type for passing arg must be consistent with that
6027 declared for the arg. ISO C says we take the unqualified
6028 type for parameters declared with qualified type. */
6029 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6030 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
6033 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6034 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6036 /* Adjust argument to match prototype. E.g. a previous
6037 `int foo(float);' prototype causes
6038 `int foo(x) float x; {...}' to be treated like
6039 `int foo(float x) {...}'. This is particularly
6040 useful for argument types like uid_t. */
6041 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6043 if (PROMOTE_PROTOTYPES
6044 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6045 && TYPE_PRECISION (TREE_TYPE (parm))
6046 < TYPE_PRECISION (integer_type_node))
6047 DECL_ARG_TYPE (parm) = integer_type_node;
6051 pedwarn ("promoted argument `%s' doesn't match prototype",
6052 IDENTIFIER_POINTER (DECL_NAME (parm)));
6053 warning ("%Hprototype declaration",
6054 ¤t_function_prototype_locus);
6059 error ("argument `%s' doesn't match prototype",
6060 IDENTIFIER_POINTER (DECL_NAME (parm)));
6061 error ("%Hprototype declaration",
6062 ¤t_function_prototype_locus);
6066 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6069 /* Otherwise, create a prototype that would match. */
6073 tree actual = 0, last = 0, type;
6075 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6077 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6079 TREE_CHAIN (last) = type;
6084 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6086 TREE_CHAIN (last) = type;
6090 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6091 of the type of this function, but we need to avoid having this
6092 affect the types of other similarly-typed functions, so we must
6093 first force the generation of an identical (but separate) type
6094 node for the relevant function type. The new node we create
6095 will be a variant of the main variant of the original function
6098 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6100 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6103 /* Now store the final chain of decls for the arguments
6104 as the decl-chain of the current lexical scope.
6105 Put the enumerators in as well, at the front so that
6106 DECL_ARGUMENTS is not modified. */
6108 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6111 /* Make sure the binding level for the top of the function body
6112 gets a BLOCK if there are any in the function.
6113 Otherwise, the dbx output is wrong. */
6115 keep_next_if_subblocks = 1;
6117 /* Write a record describing this function definition to the prototypes
6118 file (if requested). */
6120 gen_aux_info_record (fndecl, 1, 0, prototype);
6122 /* Initialize the RTL code for the function. */
6123 init_function_start (fndecl);
6125 /* Begin the statement tree for this function. */
6126 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6128 /* If this is a nested function, save away the sizes of any
6129 variable-size types so that we can expand them when generating
6135 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6136 = nreverse (get_pending_sizes ());
6137 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6140 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6143 /* This function is being processed in whole-function mode. */
6144 cfun->x_whole_function_mode_p = 1;
6146 /* Even though we're inside a function body, we still don't want to
6147 call expand_expr to calculate the size of a variable-sized array.
6148 We haven't necessarily assigned RTL to all variables yet, so it's
6149 not safe to try to expand expressions involving them. */
6150 immediate_size_expand = 0;
6151 cfun->x_dont_save_pending_sizes_p = 1;
6153 warn_shadow = saved_warn_shadow;
6156 /* Finish up a function declaration and compile that function
6157 all the way to assembler language output. The free the storage
6158 for the function definition.
6160 This is called after parsing the body of the function definition.
6162 NESTED is nonzero if the function being finished is nested in another.
6163 CAN_DEFER_P is nonzero if the function may be deferred. */
6166 finish_function (int nested, int can_defer_p)
6168 tree fndecl = current_function_decl;
6170 /* When a function declaration is totally empty, e.g.
6172 (the argument list is irrelevant) the compstmt rule will not
6173 bother calling pushlevel/poplevel, which means we get here with
6174 the binding_level stack out of sync. Detect this situation by
6175 noticing that the current_binding_level is still as
6176 store_parm_decls left it, and do a dummy push/pop to get back to
6177 consistency. Note that the call to pushlevel does not actually
6178 push another binding level - see there for details. */
6179 if (current_binding_level->parm_flag && keep_next_if_subblocks)
6185 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6187 /* Must mark the RESULT_DECL as being in this function. */
6189 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6191 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6193 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6194 != integer_type_node)
6196 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6197 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6199 pedwarn ("%Hreturn type of '%D' is not `int'",
6200 &DECL_SOURCE_LOCATION (fndecl), fndecl);
6204 #ifdef DEFAULT_MAIN_RETURN
6205 /* Make it so that `main' always returns success by default. */
6206 DEFAULT_MAIN_RETURN;
6209 c_expand_return (integer_zero_node);
6214 finish_fname_decls ();
6216 /* Tie off the statement tree for this function. */
6217 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6219 /* Complain if there's just no return statement. */
6220 if (warn_return_type
6221 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6222 && !current_function_returns_value && !current_function_returns_null
6223 /* Don't complain if we abort. */
6224 && !current_function_returns_abnormally
6225 /* Don't warn for main(). */
6226 && !MAIN_NAME_P (DECL_NAME (fndecl))
6227 /* Or if they didn't actually specify a return type. */
6228 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6229 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6230 inline function, as we might never be compiled separately. */
6231 && DECL_INLINE (fndecl))
6232 warning ("no return statement in function returning non-void");
6234 /* Clear out memory we no longer need. */
6235 free_after_parsing (cfun);
6236 /* Since we never call rest_of_compilation, we never clear
6237 CFUN. Do so explicitly. */
6238 free_after_compilation (cfun);
6241 if (flag_unit_at_a_time && can_defer_p)
6243 cgraph_finalize_function (fndecl, DECL_SAVED_TREE (fndecl));
6244 current_function_decl = NULL;
6250 /* Function is parsed.
6251 Generate RTL for the body of this function or defer
6252 it for later expansion. */
6253 int uninlinable = 1;
6255 /* There's no reason to do any of the work here if we're only doing
6256 semantic analysis; this code just generates RTL. */
6257 if (flag_syntax_only)
6259 current_function_decl = NULL;
6260 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6264 if (flag_inline_trees)
6266 /* First, cache whether the current function is inlinable. Some
6267 predicates depend on cfun and current_function_decl to
6268 function completely. */
6269 timevar_push (TV_INTEGRATION);
6270 uninlinable = ! tree_inlinable_function_p (fndecl, 0);
6273 /* We defer functions marked inline *even if* the function
6274 itself is not inlinable. This is because we don't yet
6275 know if the function will actually be used; we may be
6276 able to avoid emitting it entirely. */
6277 && (! uninlinable || DECL_DECLARED_INLINE_P (fndecl))
6278 /* Save function tree for inlining. Should return 0 if the
6279 language does not support function deferring or the
6280 function could not be deferred. */
6281 && defer_fn (fndecl))
6283 /* Let the back-end know that this function exists. */
6284 (*debug_hooks->deferred_inline_function) (fndecl);
6285 timevar_pop (TV_INTEGRATION);
6286 current_function_decl = NULL;
6290 /* Then, inline any functions called in it. */
6291 optimize_inline_calls (fndecl);
6292 timevar_pop (TV_INTEGRATION);
6295 c_expand_body (fndecl);
6297 /* Keep the function body if it's needed for inlining or dumping. */
6298 if (uninlinable && !dump_enabled_p (TDI_all))
6300 /* Allow the body of the function to be garbage collected. */
6301 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6304 /* Let the error reporting routines know that we're outside a
6305 function. For a nested function, this value is used in
6306 c_pop_function_context and then reset via pop_function_context. */
6307 current_function_decl = NULL;
6311 /* Generate the RTL for a deferred function FNDECL. */
6314 c_expand_deferred_function (tree fndecl)
6316 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6317 function was deferred, e.g. in duplicate_decls. */
6318 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6320 if (flag_inline_trees)
6322 timevar_push (TV_INTEGRATION);
6323 optimize_inline_calls (fndecl);
6324 timevar_pop (TV_INTEGRATION);
6326 c_expand_body (fndecl);
6327 current_function_decl = NULL;
6331 /* Called to move the SAVE_EXPRs for parameter declarations in a
6332 nested function into the nested function. DATA is really the
6333 nested FUNCTION_DECL. */
6336 set_save_expr_context (tree *tp,
6340 if (TREE_CODE (*tp) == SAVE_EXPR && !SAVE_EXPR_CONTEXT (*tp))
6341 SAVE_EXPR_CONTEXT (*tp) = (tree) data;
6342 /* Do not walk back into the SAVE_EXPR_CONTEXT; that will cause
6344 else if (DECL_P (*tp))
6350 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6351 then we are already in the process of generating RTL for another
6352 function. If can_defer_p is zero, we won't attempt to defer the
6353 generation of RTL. */
6356 c_expand_body_1 (tree fndecl, int nested_p)
6358 timevar_push (TV_EXPAND);
6362 /* Make sure that we will evaluate variable-sized types involved
6363 in our function's type. */
6364 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6365 /* Squirrel away our current state. */
6366 push_function_context ();
6369 /* Initialize the RTL code for the function. */
6370 current_function_decl = fndecl;
6371 input_location = DECL_SOURCE_LOCATION (fndecl);
6372 init_function_start (fndecl);
6374 /* This function is being processed in whole-function mode. */
6375 cfun->x_whole_function_mode_p = 1;
6377 /* Even though we're inside a function body, we still don't want to
6378 call expand_expr to calculate the size of a variable-sized array.
6379 We haven't necessarily assigned RTL to all variables yet, so it's
6380 not safe to try to expand expressions involving them. */
6381 immediate_size_expand = 0;
6382 cfun->x_dont_save_pending_sizes_p = 1;
6384 /* Set up parameters and prepare for return, for the function. */
6385 expand_function_start (fndecl, 0);
6387 /* If the function has a variably modified type, there may be
6388 SAVE_EXPRs in the parameter types. Their context must be set to
6389 refer to this function; they cannot be expanded in the containing
6391 if (decl_function_context (fndecl)
6392 && variably_modified_type_p (TREE_TYPE (fndecl)))
6393 walk_tree (&TREE_TYPE (fndecl), set_save_expr_context, fndecl,
6396 /* If this function is `main', emit a call to `__main'
6397 to run global initializers, etc. */
6398 if (DECL_NAME (fndecl)
6399 && MAIN_NAME_P (DECL_NAME (fndecl))
6400 && DECL_CONTEXT (fndecl) == NULL_TREE)
6401 expand_main_function ();
6403 /* Generate the RTL for this function. */
6404 expand_stmt (DECL_SAVED_TREE (fndecl));
6406 /* We hard-wired immediate_size_expand to zero above.
6407 expand_function_end will decrement this variable. So, we set the
6408 variable to one here, so that after the decrement it will remain
6410 immediate_size_expand = 1;
6412 /* Allow language dialects to perform special processing. */
6413 if (lang_expand_function_end)
6414 (*lang_expand_function_end) ();
6416 /* Generate rtl for function exit. */
6417 expand_function_end ();
6419 /* If this is a nested function, protect the local variables in the stack
6420 above us from being collected while we're compiling this function. */
6422 ggc_push_context ();
6424 /* Run the optimizers and output the assembler code for this function. */
6425 rest_of_compilation (fndecl);
6427 /* Undo the GC context switch. */
6431 /* With just -Wextra, complain only if function returns both with
6432 and without a value. */
6434 && current_function_returns_value
6435 && current_function_returns_null)
6436 warning ("this function may return with or without a value");
6438 /* If requested, warn about function definitions where the function will
6439 return a value (usually of some struct or union type) which itself will
6440 take up a lot of stack space. */
6442 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6444 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6446 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6447 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6448 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6451 const location_t *locus = &DECL_SOURCE_LOCATION (fndecl);
6452 unsigned int size_as_int
6453 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6455 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6456 warning ("%Hsize of return value of '%D' is %u bytes",
6457 locus, fndecl, size_as_int);
6459 warning ("%Hsize of return value of '%D' is larger than %wd bytes",
6460 locus, fndecl, larger_than_size);
6464 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6465 && ! flag_inline_trees)
6467 /* Stop pointing to the local nodes about to be freed.
6468 But DECL_INITIAL must remain nonzero so we know this
6469 was an actual function definition.
6470 For a nested function, this is done in c_pop_function_context.
6471 If rest_of_compilation set this to 0, leave it 0. */
6472 if (DECL_INITIAL (fndecl) != 0)
6473 DECL_INITIAL (fndecl) = error_mark_node;
6475 DECL_ARGUMENTS (fndecl) = 0;
6478 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6480 if (targetm.have_ctors_dtors)
6481 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6482 DEFAULT_INIT_PRIORITY);
6484 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6487 if (DECL_STATIC_DESTRUCTOR (fndecl))
6489 if (targetm.have_ctors_dtors)
6490 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6491 DEFAULT_INIT_PRIORITY);
6493 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6497 /* Return to the enclosing function. */
6498 pop_function_context ();
6499 timevar_pop (TV_EXPAND);
6502 /* Like c_expand_body_1 but only for unnested functions. */
6505 c_expand_body (tree fndecl)
6507 c_expand_body_1 (fndecl, 0);
6510 /* Check the declarations given in a for-loop for satisfying the C99
6513 check_for_loop_decls (void)
6519 /* If we get here, declarations have been used in a for loop without
6520 the C99 for loop scope. This doesn't make much sense, so don't
6522 error ("`for' loop initial declaration used outside C99 mode");
6525 /* C99 subclause 6.8.5 paragraph 3:
6527 [#3] The declaration part of a for statement shall only
6528 declare identifiers for objects having storage class auto or
6531 It isn't clear whether, in this sentence, "identifiers" binds to
6532 "shall only declare" or to "objects" - that is, whether all identifiers
6533 declared must be identifiers for objects, or whether the restriction
6534 only applies to those that are. (A question on this in comp.std.c
6535 in November 2000 received no answer.) We implement the strictest
6536 interpretation, to avoid creating an extension which later causes
6539 for (t = gettags (); t; t = TREE_CHAIN (t))
6541 if (TREE_PURPOSE (t) != 0)
6543 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6545 if (code == RECORD_TYPE)
6546 error ("`struct %s' declared in `for' loop initial declaration",
6547 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6548 else if (code == UNION_TYPE)
6549 error ("`union %s' declared in `for' loop initial declaration",
6550 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6552 error ("`enum %s' declared in `for' loop initial declaration",
6553 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6557 for (t = getdecls (); t; t = TREE_CHAIN (t))
6559 const location_t *locus = &DECL_SOURCE_LOCATION (t);
6560 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6561 error ("%Hdeclaration of non-variable '%D' in 'for' loop "
6562 "initial declaration", locus, t);
6563 else if (TREE_STATIC (t))
6564 error ("%Hdeclaration of static variable '%D' in 'for' loop "
6565 "initial declaration", locus, t);
6566 else if (DECL_EXTERNAL (t))
6567 error ("%Hdeclaration of 'extern' variable '%D' in 'for' loop "
6568 "initial declaration", locus, t);
6572 /* Save and restore the variables in this file and elsewhere
6573 that keep track of the progress of compilation of the current function.
6574 Used for nested functions. */
6576 struct language_function GTY(())
6578 struct c_language_function base;
6581 int returns_abnormally;
6582 int warn_about_return_type;
6584 struct binding_level *binding_level;
6587 /* Save and reinitialize the variables
6588 used during compilation of a C function. */
6591 c_push_function_context (struct function *f)
6593 struct language_function *p;
6594 p = ggc_alloc (sizeof (struct language_function));
6597 p->base.x_stmt_tree = c_stmt_tree;
6598 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6599 p->returns_value = current_function_returns_value;
6600 p->returns_null = current_function_returns_null;
6601 p->returns_abnormally = current_function_returns_abnormally;
6602 p->warn_about_return_type = warn_about_return_type;
6603 p->extern_inline = current_extern_inline;
6604 p->binding_level = current_binding_level;
6607 /* Restore the variables used during compilation of a C function. */
6610 c_pop_function_context (struct function *f)
6612 struct language_function *p = f->language;
6614 if (DECL_SAVED_INSNS (current_function_decl) == 0
6615 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6617 /* Stop pointing to the local nodes about to be freed. */
6618 /* But DECL_INITIAL must remain nonzero so we know this
6619 was an actual function definition. */
6620 DECL_INITIAL (current_function_decl) = error_mark_node;
6621 DECL_ARGUMENTS (current_function_decl) = 0;
6624 c_stmt_tree = p->base.x_stmt_tree;
6625 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6626 current_function_returns_value = p->returns_value;
6627 current_function_returns_null = p->returns_null;
6628 current_function_returns_abnormally = p->returns_abnormally;
6629 warn_about_return_type = p->warn_about_return_type;
6630 current_extern_inline = p->extern_inline;
6631 current_binding_level = p->binding_level;
6636 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6639 c_dup_lang_specific_decl (tree decl)
6641 struct lang_decl *ld;
6643 if (!DECL_LANG_SPECIFIC (decl))
6646 ld = ggc_alloc (sizeof (struct lang_decl));
6647 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6648 DECL_LANG_SPECIFIC (decl) = ld;
6651 /* The functions below are required for functionality of doing
6652 function at once processing in the C front end. Currently these
6653 functions are not called from anywhere in the C front end, but as
6654 these changes continue, that will change. */
6656 /* Returns nonzero if the current statement is a full expression,
6657 i.e. temporaries created during that statement should be destroyed
6658 at the end of the statement. */
6661 stmts_are_full_exprs_p (void)
6666 /* Returns the stmt_tree (if any) to which statements are currently
6667 being added. If there is no active statement-tree, NULL is
6671 current_stmt_tree (void)
6673 return &c_stmt_tree;
6676 /* Returns the stack of SCOPE_STMTs for the current function. */
6679 current_scope_stmt_stack (void)
6681 return &c_scope_stmt_stack;
6684 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6688 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6693 /* Dummy function in place of callback used by C++. */
6696 extract_interface_info (void)
6700 /* Return a new COMPOUND_STMT, after adding it to the current
6704 c_begin_compound_stmt (void)
6708 /* Create the COMPOUND_STMT. */
6709 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6714 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6718 c_expand_decl_stmt (tree t)
6720 tree decl = DECL_STMT_DECL (t);
6722 /* Expand nested functions. */
6723 if (TREE_CODE (decl) == FUNCTION_DECL
6724 && DECL_CONTEXT (decl) == current_function_decl
6725 && DECL_SAVED_TREE (decl))
6726 c_expand_body_1 (decl, 1);
6729 /* Return the global value of T as a symbol. */
6732 identifier_global_value (tree t)
6734 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6735 if (decl == 0 || C_DECL_FILE_SCOPE (decl))
6738 /* Shadowed by something else; find the true global value. */
6739 for (decl = global_binding_level->names; decl; decl = TREE_CHAIN (decl))
6740 if (DECL_NAME (decl) == t)
6743 /* Only local values for this decl. */
6747 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6748 otherwise the name is found in ridpointers from RID_INDEX. */
6751 record_builtin_type (enum rid rid_index, const char *name, tree type)
6755 id = ridpointers[(int) rid_index];
6757 id = get_identifier (name);
6758 pushdecl (build_decl (TYPE_DECL, id, type));
6761 /* Build the void_list_node (void_type_node having been created). */
6763 build_void_list_node (void)
6765 tree t = build_tree_list (NULL_TREE, void_type_node);
6769 /* Return something to represent absolute declarators containing a *.
6770 TARGET is the absolute declarator that the * contains.
6771 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6772 to apply to the pointer type, represented as identifiers, possible mixed
6775 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6776 if attributes are present) and whose type is the modifier list. */
6779 make_pointer_declarator (tree type_quals_attrs, tree target)
6782 tree itarget = target;
6783 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6784 if (attrs != NULL_TREE)
6785 itarget = tree_cons (attrs, target, NULL_TREE);
6786 return build1 (INDIRECT_REF, quals, itarget);
6789 /* A wrapper around lhd_set_decl_assembler_name that gives static
6790 variables their C names if they are at the top level and only one
6791 translation unit is being compiled, for backwards compatibility
6792 with certain bizzare assembler hacks (like crtstuff.c). */
6795 c_static_assembler_name (tree decl)
6797 if (num_in_fnames == 1
6798 && TREE_STATIC (decl) && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6799 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6800 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6802 lhd_set_decl_assembler_name (decl);
6805 /* Hash and equality functions for link_hash_table: key off
6806 DECL_ASSEMBLER_NAME. */
6809 link_hash_hash (const void *x_p)
6812 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6816 link_hash_eq (const void *x1_p, const void *x2_p)
6818 tree x1 = (tree)x1_p;
6819 tree x2 = (tree)x2_p;
6820 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6823 /* Propagate information between definitions and uses between multiple
6824 translation units in TU_LIST based on linkage rules. */
6827 merge_translation_unit_decls (void)
6829 const tree tu_list = current_file_decl;
6832 htab_t link_hash_table;
6835 /* Create the BLOCK that poplevel would have created, but don't
6836 actually call poplevel since that's expensive. */
6837 block = make_node (BLOCK);
6838 BLOCK_VARS (block) = current_binding_level->names;
6839 TREE_USED (block) = 1;
6840 DECL_INITIAL (current_file_decl) = block;
6842 /* If only one translation unit seen, no copying necessary. */
6843 if (TREE_CHAIN (tu_list) == NULL_TREE)
6846 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6848 /* Enter any actual definitions into the hash table. */
6849 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6850 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6851 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6854 slot = htab_find_slot (link_hash_table, decl, INSERT);
6856 /* If we've already got a definition, work out which one is
6857 the real one, put it into the hash table, and make the
6858 other one DECL_EXTERNAL. This is important to avoid
6859 putting out two definitions of the same symbol in the
6863 tree old_decl = (tree) *slot;
6865 /* If this is weak or common or whatever, suppress it
6866 in favour of the other definition. */
6867 if (DECL_WEAK (decl))
6868 DECL_EXTERNAL (decl) = 1;
6869 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6870 DECL_EXTERNAL (old_decl) = 1;
6871 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6872 DECL_EXTERNAL (decl) = 1;
6873 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6874 DECL_EXTERNAL (old_decl) = 1;
6876 if (DECL_EXTERNAL (decl))
6878 DECL_INITIAL (decl) = NULL_TREE;
6879 DECL_COMMON (decl) = 0;
6880 DECL_ONE_ONLY (decl) = 0;
6881 DECL_WEAK (decl) = 0;
6883 else if (DECL_EXTERNAL (old_decl))
6885 DECL_INITIAL (old_decl) = NULL_TREE;
6886 DECL_COMMON (old_decl) = 0;
6887 DECL_ONE_ONLY (old_decl) = 0;
6888 DECL_WEAK (old_decl) = 0;
6893 error ("%Hredefinition of global '%D'",
6894 &DECL_SOURCE_LOCATION (decl), decl);
6895 error ("%H'%D' previously defined here",
6896 &DECL_SOURCE_LOCATION (old_decl), old_decl);
6903 /* Now insert the desired information from all the definitions
6904 into any plain declarations. */
6905 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6906 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6907 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6910 global_decl = htab_find (link_hash_table, decl);
6915 /* Print any appropriate error messages, and partially merge
6917 (void) duplicate_decls (decl, global_decl, true, true);
6920 htab_delete (link_hash_table);
6923 /* Perform final processing on file-scope data. */
6926 c_write_global_declarations(void)
6930 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6932 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6933 int len = list_length (globals);
6934 tree *vec = xmalloc (sizeof (tree) * len);
6938 /* Process the decls in reverse order--earliest first.
6939 Put them into VEC from back to front, then take out from front. */
6941 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6942 vec[len - i - 1] = decl;
6944 wrapup_global_declarations (vec, len);
6946 check_global_declarations (vec, len);
6953 /* Reset the parser's state in preparation for a new file. */
6956 c_reset_state (void)
6959 tree file_scope_decl;
6961 /* Pop the global binding level. */
6962 if (current_binding_level != global_binding_level)
6963 current_binding_level = global_binding_level;
6964 file_scope_decl = current_file_decl;
6965 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6966 truly_local_externals = NULL_TREE;
6968 /* Start a new global binding level. */
6970 global_binding_level = current_binding_level;
6971 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6972 TREE_CHAIN (current_file_decl) = file_scope_decl;
6974 /* Reintroduce the global declarations. */
6975 for (link = builtin_decls; link; link = TREE_CHAIN (link))
6976 pushdecl (copy_node (link));
6979 #include "gt-c-decl.h"