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"
53 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
55 { NORMAL, /* Ordinary declaration */
56 FUNCDEF, /* Function definition */
57 PARM, /* Declaration of parm before function body */
58 FIELD, /* Declaration inside struct or union */
59 BITFIELD, /* Likewise but with specified width */
60 TYPENAME}; /* Typename (inside cast or sizeof) */
63 /* Nonzero if we have seen an invalid cross reference
64 to a struct, union, or enum, but not yet printed the message. */
66 tree pending_invalid_xref;
67 /* File and line to appear in the eventual error message. */
68 const char *pending_invalid_xref_file;
69 int pending_invalid_xref_line;
71 /* While defining an enum type, this is 1 plus the last enumerator
72 constant value. Note that will do not have to save this or `enum_overflow'
73 around nested function definition since such a definition could only
74 occur in an enum value expression and we don't use these variables in
77 static tree enum_next_value;
79 /* Nonzero means that there was overflow computing enum_next_value. */
81 static int enum_overflow;
83 /* Parsing a function declarator leaves a list of parameter names
84 or a chain or parameter decls here. */
86 static tree last_function_parms;
88 /* Parsing a function declarator leaves here a chain of structure
89 and enum types declared in the parmlist. */
91 static tree last_function_parm_tags;
93 /* After parsing the declarator that starts a function definition,
94 `start_function' puts here the list of parameter names or chain of decls.
95 `store_parm_decls' finds it here. */
97 static tree current_function_parms;
99 /* Similar, for last_function_parm_tags. */
100 static tree current_function_parm_tags;
102 /* Similar, for the file and line that the prototype came from if this is
103 an old-style definition. */
104 static const char *current_function_prototype_file;
105 static int current_function_prototype_line;
107 /* The current statement tree. */
109 static GTY(()) struct stmt_tree_s c_stmt_tree;
111 /* The current scope statement stack. */
113 static GTY(()) tree c_scope_stmt_stack;
115 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
116 that have names. Here so we can clear out their names' definitions
117 at the end of the function. */
119 static GTY(()) tree named_labels;
121 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
123 static GTY(()) tree shadowed_labels;
125 /* A list of external DECLs that appeared at block scope when there was
126 some other global meaning for that identifier. */
127 static GTY(()) tree truly_local_externals;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a return statement that specifies a return value is seen. */
132 int current_function_returns_value;
134 /* Set to 0 at beginning of a function definition, set to 1 if
135 a return statement with no argument is seen. */
137 int current_function_returns_null;
139 /* Set to 0 at beginning of a function definition, set to 1 if
140 a call to a noreturn function is seen. */
142 int current_function_returns_abnormally;
144 /* Set to nonzero by `grokdeclarator' for a function
145 whose return type is defaulted, if warnings for this are desired. */
147 static int warn_about_return_type;
149 /* Nonzero when starting a function declared `extern inline'. */
151 static int current_extern_inline;
153 /* For each binding contour we allocate a binding_level structure
154 * which records the names defined in that contour.
157 * 1) one for each function definition,
158 * where internal declarations of the parameters appear.
159 * 2) one for each compound statement,
160 * to record its declarations.
162 * The current meaning of a name can be found by searching the levels from
163 * the current one out to the global one.
166 struct binding_level GTY(())
168 /* A chain of _DECL nodes for all variables, constants, functions,
169 and typedef types. These are in the reverse of the order supplied.
173 /* A list of structure, union and enum definitions,
174 * for looking up tag names.
175 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
176 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
177 * or ENUMERAL_TYPE node.
181 /* For each level, a list of shadowed outer-level definitions
182 to be restored when this level is popped.
183 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
184 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
187 /* For each level, a list of shadowed outer-level tag definitions
188 to be restored when this level is popped.
189 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
190 whose TREE_VALUE is its old definition (a kind of ..._TYPE node). */
193 /* For each level (except not the global one),
194 a chain of BLOCK nodes for all the levels
195 that were entered and exited one level down. */
198 /* The binding level which this one is contained in (inherits from). */
199 struct binding_level *level_chain;
201 /* Nonzero if we are currently filling this level with parameter
205 /* Nonzero if this is the outermost block scope of a function body.
206 This scope contains both the parameters and the local variables
207 declared in the outermost block. */
210 /* Nonzero means make a BLOCK for this level regardless of all else. */
213 /* Nonzero means make a BLOCK if this level has any subblocks. */
214 char keep_if_subblocks;
216 /* List of decls in `names' that have incomplete structure or
218 tree incomplete_list;
220 /* A list of decls giving the (reversed) specified order of parms,
221 not including any forward-decls in the parmlist.
222 This is so we can put the parms in proper order for assign_parms. */
226 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
228 /* The binding level currently in effect. */
230 static GTY(()) struct binding_level *current_binding_level;
232 /* A chain of binding_level structures awaiting reuse. */
234 static GTY((deletable (""))) struct binding_level *free_binding_level;
236 /* The outermost binding level, for names of file scope.
237 This is created when the compiler is started and exists
238 through the entire run. */
240 static GTY(()) struct binding_level *global_binding_level;
242 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
244 static int keep_next_level_flag;
246 /* Nonzero means make a BLOCK for the next level pushed
247 if it has subblocks. */
249 static int keep_next_if_subblocks;
251 /* The chain of outer levels of label scopes.
252 This uses the same data structure used for binding levels,
253 but it works differently: each link in the chain records
254 saved values of named_labels and shadowed_labels for
255 a label binding level outside the current one. */
257 static GTY(()) struct binding_level *label_level_chain;
259 /* Functions called automatically at the beginning and end of execution. */
261 tree static_ctors, static_dtors;
263 /* Forward declarations. */
265 static struct binding_level *make_binding_level PARAMS ((void));
266 static void pop_binding_level PARAMS ((struct binding_level **));
267 static int duplicate_decls PARAMS ((tree, tree, int));
268 static int redeclaration_error_message PARAMS ((tree, tree));
269 static void implicit_decl_warning PARAMS ((tree));
270 static void storedecls PARAMS ((tree));
271 static void storetags PARAMS ((tree));
272 static tree lookup_tag PARAMS ((enum tree_code, tree, int));
273 static tree lookup_name_current_level PARAMS ((tree));
274 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
276 static tree grokparms PARAMS ((tree, int));
277 static void layout_array_type PARAMS ((tree));
278 static tree c_make_fname_decl PARAMS ((tree, int));
279 static void c_expand_body_1 PARAMS ((tree, int));
280 static tree any_external_decl PARAMS ((tree));
281 static void record_external_decl PARAMS ((tree));
282 static void warn_if_shadowing PARAMS ((tree, tree));
283 static void clone_underlying_type PARAMS ((tree));
284 static bool flexible_array_type_p PARAMS ((tree));
286 /* States indicating how grokdeclarator() should handle declspecs marked
287 with __attribute__((deprecated)). An object declared as
288 __attribute__((deprecated)) suppresses warnings of uses of other
291 enum deprecated_states {
296 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
299 c_print_identifier (file, node, indent)
304 print_node (file, "symbol", IDENTIFIER_SYMBOL_VALUE (node), indent + 4);
305 print_node (file, "tag", IDENTIFIER_TAG_VALUE (node), indent + 4);
306 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
307 if (C_IS_RESERVED_WORD (node))
309 tree rid = ridpointers[C_RID_CODE (node)];
310 indent_to (file, indent + 4);
311 fprintf (file, "rid ");
312 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
313 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
317 /* Hook called at end of compilation to assume 1 elt
318 for a top-level tentative array defn that wasn't complete before. */
321 c_finish_incomplete_decl (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_with_decl (decl, "array `%s' assumed to have one element");
334 complete_array_type (type, NULL_TREE, 1);
336 layout_decl (decl, 0);
341 /* Reuse or create a struct for this binding level. */
343 static struct binding_level *
344 make_binding_level ()
346 struct binding_level *result;
347 if (free_binding_level)
349 result = free_binding_level;
350 free_binding_level = result->level_chain;
351 memset (result, 0, sizeof(struct binding_level));
354 result = (struct binding_level *)
355 ggc_alloc_cleared (sizeof (struct binding_level));
360 /* Remove a binding level from a list and add it to the level chain. */
363 pop_binding_level (lp)
364 struct binding_level **lp;
366 struct binding_level *l = *lp;
367 *lp = l->level_chain;
369 memset (l, 0, sizeof (struct binding_level));
370 l->level_chain = free_binding_level;
371 free_binding_level = l;
374 /* Nonzero if we are currently in the global binding level. */
379 return current_binding_level == global_binding_level;
385 keep_next_level_flag = 1;
388 /* Nonzero if the current level needs to have a BLOCK made. */
393 return ((current_binding_level->keep_if_subblocks
394 && current_binding_level->blocks != 0)
395 || current_binding_level->keep
396 || current_binding_level->names != 0
397 || current_binding_level->tags != 0);
400 /* Identify this binding level as a level of parameters.
401 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
402 But it turns out there is no way to pass the right value for
403 DEFINITION_FLAG, so we ignore it. */
406 declare_parm_level (definition_flag)
407 int definition_flag ATTRIBUTE_UNUSED;
409 current_binding_level->parm_flag = 1;
412 /* Nonzero if currently making parm declarations. */
417 return current_binding_level->parm_flag;
420 /* Enter a new binding level. */
424 int dummy ATTRIBUTE_UNUSED;
426 /* If this is the top level of a function, make sure that
427 NAMED_LABELS is 0. */
429 if (current_binding_level == global_binding_level)
432 if (keep_next_if_subblocks)
434 /* This is the transition from the parameters to the top level
435 of the function body. These are the same scope
436 (C99 6.2.1p4,6) so we do not push another binding level.
438 XXX Note kludge - keep_next_if_subblocks is set only by
439 store_parm_decls, which in turn is called when and only
440 when we are about to encounter the opening curly brace for
441 the function body. */
442 current_binding_level->parm_flag = 0;
443 current_binding_level->function_body = 1;
444 current_binding_level->keep |= keep_next_level_flag;
445 current_binding_level->keep_if_subblocks = 1;
447 keep_next_level_flag = 0;
448 keep_next_if_subblocks = 0;
452 struct binding_level *newlevel = make_binding_level ();
454 newlevel->keep = keep_next_level_flag;
455 newlevel->level_chain = current_binding_level;
456 current_binding_level = newlevel;
457 keep_next_level_flag = 0;
461 /* Exit a binding level.
462 Pop the level off, and restore the state of the identifier-decl mappings
463 that were in effect when this level was entered.
465 If KEEP is nonzero, this level had explicit declarations, so
466 and create a "block" (a BLOCK node) for the level
467 to record its declarations and subblocks for symbol table output.
469 If FUNCTIONBODY is nonzero, this level is the body of a function,
470 so create a block as if KEEP were set and also clear out all
473 If REVERSE is nonzero, reverse the order of decls before putting
474 them into the BLOCK. */
477 poplevel (keep, reverse, functionbody)
485 tree decls = current_binding_level->names;
486 tree tags = current_binding_level->tags;
487 tree subblocks = current_binding_level->blocks;
489 functionbody |= current_binding_level->function_body;
490 keep |= (current_binding_level->keep || functionbody
491 || (current_binding_level->keep_if_subblocks && subblocks != 0));
493 /* We used to warn about unused variables in expand_end_bindings,
494 i.e. while generating RTL. But in function-at-a-time mode we may
495 choose to never expand a function at all (e.g. auto inlining), so
496 we do this explicitly now. */
497 warn_about_unused_variables (decls);
499 /* Clear out the name-meanings declared on this level.
500 Propagate TREE_ADDRESSABLE from nested functions to their
501 containing functions. */
502 for (link = decls; link; link = TREE_CHAIN (link))
504 if (DECL_NAME (link) != 0)
506 if (DECL_EXTERNAL (link))
507 /* External decls stay in the symbol-value slot but are
509 C_DECL_INVISIBLE (link) = 1;
511 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (link)) = 0;
514 if (TREE_CODE (link) == FUNCTION_DECL
515 && ! TREE_ASM_WRITTEN (link)
516 && DECL_INITIAL (link) != 0
517 && TREE_ADDRESSABLE (link)
518 && DECL_ABSTRACT_ORIGIN (link) != 0
519 && DECL_ABSTRACT_ORIGIN (link) != link)
520 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (link)) = 1;
523 /* Clear out the tag-meanings declared on this level. */
524 for (link = tags; link; link = TREE_CHAIN (link))
525 if (TREE_PURPOSE (link))
526 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (link)) = 0;
528 /* Restore all name-meanings of the outer levels
529 that were shadowed by this level. */
531 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
532 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
534 /* Restore all tag-meanings of the outer levels
535 that were shadowed by this level. */
537 for (link = current_binding_level->shadowed_tags; link;
538 link = TREE_CHAIN (link))
539 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
541 /* If this is the top level block of a function, remove all
542 PARM_DECLs from current_binding_level->names; they are already
543 stored in DECL_ARGUMENTS of cfun->decl in proper order, should
544 not be put in BLOCK_VARS, and furthermore reversing them will
545 cause trouble later. They are all together at the end of the
547 if (functionbody && decls)
549 if (TREE_CODE (decls) == PARM_DECL)
554 while (TREE_CHAIN (link)
555 && TREE_CODE (TREE_CHAIN (link)) != PARM_DECL)
556 link = TREE_CHAIN (link);
558 TREE_CHAIN (link) = 0;
562 /* Get the decls in the order they were written.
563 Usually current_binding_level->names is in reverse order.
564 But parameter decls were previously put in forward order. */
567 decls = nreverse (decls);
569 /* If there were any declarations or structure tags in that level,
570 or if this level is a function body,
571 create a BLOCK to record them for the life of this function. */
576 block = make_node (BLOCK);
577 BLOCK_VARS (block) = decls;
578 BLOCK_SUBBLOCKS (block) = subblocks;
579 TREE_USED (block) = 1;
582 /* In each subblock, record that this is its superior. */
584 for (link = subblocks; link; link = TREE_CHAIN (link))
585 BLOCK_SUPERCONTEXT (link) = block;
587 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
588 binding contour so that they point to the appropriate construct, i.e.
589 either to the current FUNCTION_DECL node, or else to the BLOCK node
592 Note that for tagged types whose scope is just the formal parameter
593 list for some function type specification, we can't properly set
594 their TYPE_CONTEXTs here, because we don't have a pointer to the
595 appropriate FUNCTION_TYPE node readily available to us. For those
596 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
597 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
598 node which will represent the "scope" for these "parameter list local"
601 decl = functionbody ? current_function_decl : block;
603 for (link = tags; link; link = TREE_CHAIN (link))
604 TYPE_CONTEXT (TREE_VALUE (link)) = decl;
606 /* If the level being exited is the top level of a function, check
607 over all the labels, and clear out the current (function local)
608 meanings of their names. Then add them to BLOCK_VARS. */
612 for (link = named_labels; link; link = TREE_CHAIN (link))
614 tree label = TREE_VALUE (link);
616 if (DECL_INITIAL (label) == 0)
618 error_with_decl (label, "label `%s' used but not defined");
619 /* Avoid crashing later. */
620 define_label (input_filename, lineno,
623 else if (warn_unused_label && !TREE_USED (label))
624 warning_with_decl (label, "label `%s' defined but not used");
625 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
627 /* Put the labels into the "variables" of the
628 top-level block, so debugger can see them. */
629 TREE_CHAIN (label) = BLOCK_VARS (block);
630 BLOCK_VARS (block) = label;
634 /* Pop the current level, and free the structure for reuse. */
636 pop_binding_level (¤t_binding_level);
638 /* Dispose of the block that we just made inside some higher level. */
640 DECL_INITIAL (current_function_decl) = block;
642 current_binding_level->blocks
643 = chainon (current_binding_level->blocks, block);
644 /* If we did not make a block for the level just exited,
645 any blocks made for inner levels
646 (since they cannot be recorded as subblocks in that level)
647 must be carried forward so they will later become subblocks
648 of something else. */
650 current_binding_level->blocks
651 = chainon (current_binding_level->blocks, subblocks);
656 /* Insert BLOCK at the end of the list of subblocks of the
657 current binding level. This is used when a BIND_EXPR is expanded,
658 to handle the BLOCK node inside the BIND_EXPR. */
664 TREE_USED (block) = 1;
665 current_binding_level->blocks
666 = chainon (current_binding_level->blocks, block);
669 /* Set the BLOCK node for the innermost scope (the one we are
670 currently in). The RTL expansion machinery requires us to provide
671 this hook, but it is not useful in function-at-a-time mode. */
675 tree block ATTRIBUTE_UNUSED;
682 struct binding_level *newlevel;
684 newlevel = make_binding_level ();
686 /* Add this level to the front of the chain (stack) of label levels. */
688 newlevel->level_chain = label_level_chain;
689 label_level_chain = newlevel;
691 newlevel->names = named_labels;
692 newlevel->shadowed = shadowed_labels;
700 struct binding_level *level = label_level_chain;
703 /* Clear out the definitions of the declared labels in this level.
704 Leave in the list any ordinary, non-declared labels. */
705 for (link = named_labels, prev = 0; link;)
707 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
709 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
711 error_with_decl (TREE_VALUE (link),
712 "label `%s' used but not defined");
713 /* Avoid crashing later. */
714 define_label (input_filename, lineno,
715 DECL_NAME (TREE_VALUE (link)));
717 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
718 warning_with_decl (TREE_VALUE (link),
719 "label `%s' defined but not used");
720 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
722 /* Delete this element from the list. */
723 link = TREE_CHAIN (link);
725 TREE_CHAIN (prev) = link;
732 link = TREE_CHAIN (link);
736 /* Bring back all the labels that were shadowed. */
737 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
738 if (DECL_NAME (TREE_VALUE (link)) != 0)
739 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
742 named_labels = chainon (named_labels, level->names);
743 shadowed_labels = level->shadowed;
745 /* Pop the current level, and free the structure for reuse. */
746 pop_binding_level (&label_level_chain);
749 /* Push a definition or a declaration of struct, union or enum tag "name".
750 "type" should be the type node.
751 We assume that the tag "name" is not already defined.
753 Note that the definition may really be just a forward reference.
754 In that case, the TYPE_SIZE will be zero. */
760 struct binding_level *b = current_binding_level;
764 /* Record the identifier as the type's name if it has none. */
766 if (TYPE_NAME (type) == 0)
767 TYPE_NAME (type) = name;
769 if (IDENTIFIER_TAG_VALUE (name))
770 b->shadowed_tags = tree_cons (name, IDENTIFIER_TAG_VALUE (name),
772 IDENTIFIER_TAG_VALUE (name) = type;
775 b->tags = tree_cons (name, type, b->tags);
777 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
778 tagged type we just added to the current binding level. This fake
779 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
780 to output a representation of a tagged type, and it also gives
781 us a convenient place to record the "scope start" address for the
784 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
786 /* An approximation for now, so we can tell this is a function-scope tag.
787 This will be updated in poplevel. */
788 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
791 /* Handle when a new declaration NEWDECL
792 has the same name as an old one OLDDECL
793 in the same binding contour.
794 Prints an error message if appropriate.
796 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
799 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
800 and OLDDECL is in an outer binding level and should thus not be changed. */
803 duplicate_decls (newdecl, olddecl, different_binding_level)
804 tree newdecl, olddecl;
805 int different_binding_level;
807 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
808 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
809 && DECL_INITIAL (newdecl) != 0);
810 tree oldtype = TREE_TYPE (olddecl);
811 tree newtype = TREE_TYPE (newdecl);
814 if (DECL_P (olddecl))
816 if (TREE_CODE (newdecl) == FUNCTION_DECL
817 && TREE_CODE (olddecl) == FUNCTION_DECL
818 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
820 if (DECL_DECLARED_INLINE_P (newdecl)
821 && DECL_UNINLINABLE (newdecl)
822 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
823 /* Already warned elsewhere. */;
824 else if (DECL_DECLARED_INLINE_P (olddecl)
825 && DECL_UNINLINABLE (olddecl)
826 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
827 /* Already warned. */;
828 else if (DECL_DECLARED_INLINE_P (newdecl)
829 && ! DECL_DECLARED_INLINE_P (olddecl)
830 && DECL_UNINLINABLE (olddecl)
831 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
833 warning_with_decl (newdecl,
834 "function `%s' redeclared as inline");
835 warning_with_decl (olddecl,
836 "previous declaration of function `%s' with attribute noinline");
838 else if (DECL_DECLARED_INLINE_P (olddecl)
839 && DECL_UNINLINABLE (newdecl)
840 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
842 warning_with_decl (newdecl,
843 "function `%s' redeclared with attribute noinline");
844 warning_with_decl (olddecl,
845 "previous declaration of function `%s' was inline");
849 DECL_ATTRIBUTES (newdecl)
850 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
853 if (TREE_CODE (newtype) == ERROR_MARK
854 || TREE_CODE (oldtype) == ERROR_MARK)
857 /* New decl is completely inconsistent with the old one =>
858 tell caller to replace the old one.
859 This is always an error except in the case of shadowing a builtin. */
860 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
862 if (TREE_CODE (olddecl) == FUNCTION_DECL
863 && (DECL_BUILT_IN (olddecl)
864 || DECL_BUILT_IN_NONANSI (olddecl)))
866 /* If you declare a built-in or predefined function name as static,
867 the old definition is overridden,
868 but optionally warn this was a bad choice of name. */
869 if (!TREE_PUBLIC (newdecl))
873 else if (DECL_BUILT_IN (olddecl))
874 warning_with_decl (newdecl, "shadowing built-in function `%s'");
876 warning_with_decl (newdecl, "shadowing library function `%s'");
878 /* Likewise, if the built-in is not ansi, then programs can
879 override it even globally without an error. */
880 else if (! DECL_BUILT_IN (olddecl))
881 warning_with_decl (newdecl,
882 "library function `%s' declared as non-function");
884 else if (DECL_BUILT_IN_NONANSI (olddecl))
885 warning_with_decl (newdecl,
886 "built-in function `%s' declared as non-function");
888 warning_with_decl (newdecl,
889 "built-in function `%s' declared as non-function");
893 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
894 error_with_decl (olddecl, "previous declaration of `%s'");
900 /* For real parm decl following a forward decl, return 1 so old decl
901 will be reused. Only allow this to happen once. */
902 if (types_match && TREE_CODE (newdecl) == PARM_DECL
903 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
905 TREE_ASM_WRITTEN (olddecl) = 0;
909 /* The new declaration is the same kind of object as the old one.
910 The declarations may partially match. Print warnings if they don't
911 match enough. Ultimately, copy most of the information from the new
912 decl to the old one, and keep using the old one. */
914 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
916 /* A function declaration for a built-in function. */
917 if (!TREE_PUBLIC (newdecl))
919 /* If you declare a built-in function name as static, the
920 built-in definition is overridden,
921 but optionally warn this was a bad choice of name. */
923 warning_with_decl (newdecl, "shadowing built-in function `%s'");
924 /* Discard the old built-in function. */
927 else if (!types_match)
929 /* Accept the return type of the new declaration if same modes. */
930 tree oldreturntype = TREE_TYPE (oldtype);
931 tree newreturntype = TREE_TYPE (newtype);
933 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
935 /* Function types may be shared, so we can't just modify
936 the return type of olddecl's function type. */
938 = build_function_type (newreturntype,
939 TYPE_ARG_TYPES (oldtype));
940 trytype = build_type_attribute_variant (trytype,
941 TYPE_ATTRIBUTES (oldtype));
943 types_match = comptypes (newtype, trytype);
947 /* Accept harmless mismatch in first argument type also.
948 This is for the ffs and fprintf builtins. */
949 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
950 && TYPE_ARG_TYPES (oldtype) != 0
951 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
952 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
953 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
954 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
956 /* Function types may be shared, so we can't just modify
957 the return type of olddecl's function type. */
959 = build_function_type (TREE_TYPE (oldtype),
960 tree_cons (NULL_TREE,
961 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
962 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
963 trytype = build_type_attribute_variant (trytype,
964 TYPE_ATTRIBUTES (oldtype));
966 types_match = comptypes (newtype, trytype);
970 if (! different_binding_level)
971 TREE_TYPE (olddecl) = oldtype;
973 else if (TYPE_ARG_TYPES (oldtype) == NULL
974 && TYPE_ARG_TYPES (newtype) != NULL)
976 /* For bcmp, bzero, fputs the builtin type has arguments not
977 specified. Use the ones from the prototype so that type checking
980 = build_function_type (TREE_TYPE (oldtype),
981 TYPE_ARG_TYPES (newtype));
982 trytype = build_type_attribute_variant (trytype,
983 TYPE_ATTRIBUTES (oldtype));
986 if (! different_binding_level)
987 TREE_TYPE (olddecl) = oldtype;
991 /* If types don't match for a built-in, throw away the built-in. */
992 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
996 else if (TREE_CODE (olddecl) == FUNCTION_DECL
997 && DECL_SOURCE_LINE (olddecl) == 0)
999 /* A function declaration for a predeclared function
1000 that isn't actually built in. */
1001 if (!TREE_PUBLIC (newdecl))
1003 /* If you declare it as static, the
1004 default definition is overridden. */
1007 else if (!types_match)
1009 /* If the types don't match, preserve volatility indication.
1010 Later on, we will discard everything else about the
1011 default declaration. */
1012 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1015 /* Permit char *foo () to match void *foo (...) if not pedantic,
1016 if one of them came from a system header file. */
1017 else if (!types_match
1018 && TREE_CODE (olddecl) == FUNCTION_DECL
1019 && TREE_CODE (newdecl) == FUNCTION_DECL
1020 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1021 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1022 && (DECL_IN_SYSTEM_HEADER (olddecl)
1023 || DECL_IN_SYSTEM_HEADER (newdecl))
1024 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1025 && TYPE_ARG_TYPES (oldtype) == 0
1026 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1027 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1029 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1030 && TYPE_ARG_TYPES (newtype) == 0
1031 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1032 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1035 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1036 /* Make sure we keep void * as ret type, not char *. */
1037 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1038 TREE_TYPE (newdecl) = newtype = oldtype;
1040 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1041 we will come back here again. */
1042 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1044 /* Permit void foo (...) to match int foo (...) if the latter is the
1045 definition and implicit int was used. See c-torture/compile/920625-2.c. */
1046 else if (!types_match && new_is_definition
1047 && TREE_CODE (olddecl) == FUNCTION_DECL
1048 && TREE_CODE (newdecl) == FUNCTION_DECL
1049 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1050 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1051 && C_FUNCTION_IMPLICIT_INT (newdecl))
1053 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1054 /* Make sure we keep void as the return type. */
1055 TREE_TYPE (newdecl) = newtype = oldtype;
1056 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1058 else if (!types_match
1059 /* Permit char *foo (int, ...); followed by char *foo ();
1061 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1063 /* Return types must still match. */
1064 && comptypes (TREE_TYPE (oldtype),
1065 TREE_TYPE (newtype))
1066 && TYPE_ARG_TYPES (newtype) == 0))
1068 error_with_decl (newdecl, "conflicting types for `%s'");
1069 /* Check for function type mismatch
1070 involving an empty arglist vs a nonempty one. */
1071 if (TREE_CODE (olddecl) == FUNCTION_DECL
1072 && comptypes (TREE_TYPE (oldtype),
1073 TREE_TYPE (newtype))
1074 && ((TYPE_ARG_TYPES (oldtype) == 0
1075 && DECL_INITIAL (olddecl) == 0)
1077 (TYPE_ARG_TYPES (newtype) == 0
1078 && DECL_INITIAL (newdecl) == 0)))
1080 /* Classify the problem further. */
1081 tree t = TYPE_ARG_TYPES (oldtype);
1083 t = TYPE_ARG_TYPES (newtype);
1084 for (; t; t = TREE_CHAIN (t))
1086 tree type = TREE_VALUE (t);
1088 if (TREE_CHAIN (t) == 0
1089 && TYPE_MAIN_VARIANT (type) != void_type_node)
1091 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1095 if (c_type_promotes_to (type) != type)
1097 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1102 if (C_DECL_IMPLICIT (olddecl))
1103 error_with_decl (olddecl, "previous implicit declaration of `%s'");
1105 error_with_decl (olddecl, "previous declaration of `%s'");
1107 /* This is safer because the initializer might contain references
1108 to variables that were declared between olddecl and newdecl. This
1109 will make the initializer invalid for olddecl in case it gets
1110 assigned to olddecl below. */
1111 if (TREE_CODE (newdecl) == VAR_DECL)
1112 DECL_INITIAL (newdecl) = 0;
1114 /* TLS cannot follow non-TLS declaration. */
1115 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1116 && !DECL_THREAD_LOCAL (olddecl) && DECL_THREAD_LOCAL (newdecl))
1118 error_with_decl (newdecl, "thread-local declaration of `%s' follows non thread-local declaration");
1119 error_with_decl (olddecl, "previous declaration of `%s'");
1121 /* non-TLS declaration cannot follow TLS declaration. */
1122 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1123 && DECL_THREAD_LOCAL (olddecl) && !DECL_THREAD_LOCAL (newdecl))
1125 error_with_decl (newdecl, "non thread-local declaration of `%s' follows thread-local declaration");
1126 error_with_decl (olddecl, "previous declaration of `%s'");
1130 errmsg = redeclaration_error_message (newdecl, olddecl);
1136 error_with_decl (newdecl, "redefinition of `%s'");
1139 error_with_decl (newdecl, "redeclaration of `%s'");
1142 error_with_decl (newdecl, "conflicting declarations of `%s'");
1148 error_with_decl (olddecl,
1149 ((DECL_INITIAL (olddecl)
1150 && current_binding_level == global_binding_level)
1151 ? "`%s' previously defined here"
1152 : "`%s' previously declared here"));
1155 else if (TREE_CODE (newdecl) == TYPE_DECL
1156 && (DECL_IN_SYSTEM_HEADER (olddecl)
1157 || DECL_IN_SYSTEM_HEADER (newdecl)))
1159 warning_with_decl (newdecl, "redefinition of `%s'");
1162 ((DECL_INITIAL (olddecl)
1163 && current_binding_level == global_binding_level)
1164 ? "`%s' previously defined here"
1165 : "`%s' previously declared here"));
1167 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1168 && DECL_INITIAL (olddecl) != 0
1169 && TYPE_ARG_TYPES (oldtype) == 0
1170 && TYPE_ARG_TYPES (newtype) != 0
1171 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1175 /* Prototype decl follows defn w/o prototype. */
1177 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1178 type = TYPE_ARG_TYPES (newtype),
1181 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1183 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1184 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1186 warning_with_decl (newdecl, "prototype for `%s' follows");
1187 warning_with_decl (olddecl, "non-prototype definition here");
1190 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1191 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1193 error_with_decl (newdecl,
1194 "prototype for `%s' follows and number of arguments doesn't match");
1195 error_with_decl (olddecl, "non-prototype definition here");
1199 /* Type for passing arg must be consistent
1200 with that declared for the arg. */
1201 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)))
1203 error_with_decl (newdecl,
1204 "prototype for `%s' follows and argument %d doesn't match",
1206 error_with_decl (olddecl, "non-prototype definition here");
1212 /* Warn about mismatches in various flags. */
1215 /* Warn if function is now inline
1216 but was previously declared not inline and has been called. */
1217 if (TREE_CODE (olddecl) == FUNCTION_DECL
1218 && ! DECL_DECLARED_INLINE_P (olddecl)
1219 && DECL_DECLARED_INLINE_P (newdecl)
1220 && TREE_USED (olddecl))
1221 warning_with_decl (newdecl,
1222 "`%s' declared inline after being called");
1223 if (TREE_CODE (olddecl) == FUNCTION_DECL
1224 && ! DECL_DECLARED_INLINE_P (olddecl)
1225 && DECL_DECLARED_INLINE_P (newdecl)
1226 && DECL_INITIAL (olddecl) != 0)
1227 warning_with_decl (newdecl,
1228 "`%s' declared inline after its definition");
1230 /* If pedantic, warn when static declaration follows a non-static
1231 declaration. Otherwise, do so only for functions. */
1232 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1233 && TREE_PUBLIC (olddecl)
1234 && !TREE_PUBLIC (newdecl))
1235 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1237 /* If warn_traditional, warn when a non-static function
1238 declaration follows a static one. */
1239 if (warn_traditional && !in_system_header
1240 && TREE_CODE (olddecl) == FUNCTION_DECL
1241 && !TREE_PUBLIC (olddecl)
1242 && TREE_PUBLIC (newdecl))
1243 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1245 /* Warn when const declaration follows a non-const
1246 declaration, but not for functions. */
1247 if (TREE_CODE (olddecl) != FUNCTION_DECL
1248 && !TREE_READONLY (olddecl)
1249 && TREE_READONLY (newdecl))
1250 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1251 /* These bits are logically part of the type, for variables.
1252 But not for functions
1253 (where qualifiers are not valid ANSI anyway). */
1254 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1255 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1256 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1257 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1261 /* Optionally warn about more than one declaration for the same name. */
1262 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1263 /* Don't warn about a function declaration
1264 followed by a definition. */
1265 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1266 && DECL_INITIAL (olddecl) == 0)
1267 /* Don't warn about extern decl followed by (tentative) definition. */
1268 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1270 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1271 warning_with_decl (olddecl, "previous declaration of `%s'");
1274 /* Copy all the DECL_... slots specified in the new decl
1275 except for any that we copy here from the old type.
1277 Past this point, we don't change OLDTYPE and NEWTYPE
1278 even if we change the types of NEWDECL and OLDDECL. */
1282 /* When copying info to olddecl, we store into write_olddecl
1283 instead. This allows us to avoid modifying olddecl when
1284 different_binding_level is true. */
1285 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1287 /* Merge the data types specified in the two decls. */
1288 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1290 if (different_binding_level)
1292 if (TYPE_ARG_TYPES (oldtype) != 0
1293 && TYPE_ARG_TYPES (newtype) == 0)
1294 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1297 = build_type_attribute_variant
1299 merge_attributes (TYPE_ATTRIBUTES (newtype),
1300 TYPE_ATTRIBUTES (oldtype)));
1304 = TREE_TYPE (olddecl)
1305 = common_type (newtype, oldtype);
1308 /* Lay the type out, unless already done. */
1309 if (oldtype != TREE_TYPE (newdecl))
1311 if (TREE_TYPE (newdecl) != error_mark_node)
1312 layout_type (TREE_TYPE (newdecl));
1313 if (TREE_CODE (newdecl) != FUNCTION_DECL
1314 && TREE_CODE (newdecl) != TYPE_DECL
1315 && TREE_CODE (newdecl) != CONST_DECL)
1316 layout_decl (newdecl, 0);
1320 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1321 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1322 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1323 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1324 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1325 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1327 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1328 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1332 /* Keep the old rtl since we can safely use it. */
1333 COPY_DECL_RTL (olddecl, newdecl);
1335 /* Merge the type qualifiers. */
1336 if (TREE_READONLY (newdecl))
1337 TREE_READONLY (write_olddecl) = 1;
1339 if (TREE_THIS_VOLATILE (newdecl))
1341 TREE_THIS_VOLATILE (write_olddecl) = 1;
1342 if (TREE_CODE (newdecl) == VAR_DECL
1343 /* If an automatic variable is re-declared in the same
1344 function scope, but the old declaration was not
1345 volatile, make_var_volatile() would crash because the
1346 variable would have been assigned to a pseudo, not a
1347 MEM. Since this duplicate declaration is invalid
1348 anyway, we just skip the call. */
1350 make_var_volatile (newdecl);
1353 /* Keep source location of definition rather than declaration. */
1354 /* When called with different_binding_level set, keep the old
1355 information so that meaningful diagnostics can be given. */
1356 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1357 && ! different_binding_level)
1359 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1360 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1363 /* Merge the unused-warning information. */
1364 if (DECL_IN_SYSTEM_HEADER (olddecl))
1365 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1366 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1367 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1369 /* Merge the initialization information. */
1370 /* When called with different_binding_level set, don't copy over
1371 DECL_INITIAL, so that we don't accidentally change function
1372 declarations into function definitions. */
1373 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1374 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1376 /* Merge the section attribute.
1377 We want to issue an error if the sections conflict but that must be
1378 done later in decl_attributes since we are called before attributes
1380 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1381 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1383 /* Copy the assembler name.
1384 Currently, it can only be defined in the prototype. */
1385 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1387 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1389 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1390 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1391 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1392 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1393 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1396 /* If cannot merge, then use the new type and qualifiers,
1397 and don't preserve the old rtl. */
1398 else if (! different_binding_level)
1400 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1401 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1402 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1403 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1406 /* Merge the storage class information. */
1407 merge_weak (newdecl, olddecl);
1409 /* For functions, static overrides non-static. */
1410 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1412 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1413 /* This is since we don't automatically
1414 copy the attributes of NEWDECL into OLDDECL. */
1415 /* No need to worry about different_binding_level here because
1416 then TREE_PUBLIC (newdecl) was true. */
1417 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1418 /* If this clears `static', clear it in the identifier too. */
1419 if (! TREE_PUBLIC (olddecl))
1420 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1422 if (DECL_EXTERNAL (newdecl))
1424 if (! different_binding_level)
1426 /* Don't mess with these flags on local externs; they remain
1427 external even if there's a declaration at file scope which
1429 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1430 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1432 /* An extern decl does not override previous storage class. */
1433 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1434 if (! DECL_EXTERNAL (newdecl))
1435 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1439 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1440 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1443 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1445 /* If we're redefining a function previously defined as extern
1446 inline, make sure we emit debug info for the inline before we
1447 throw it away, in case it was inlined into a function that hasn't
1448 been written out yet. */
1449 if (new_is_definition && DECL_INITIAL (olddecl))
1451 if (TREE_USED (olddecl))
1452 (*debug_hooks->outlining_inline_function) (olddecl);
1454 /* The new defn must not be inline. */
1455 DECL_INLINE (newdecl) = 0;
1456 DECL_UNINLINABLE (newdecl) = 1;
1460 /* If either decl says `inline', this fn is inline,
1461 unless its definition was passed already. */
1462 if (DECL_DECLARED_INLINE_P (newdecl)
1463 || DECL_DECLARED_INLINE_P (olddecl))
1464 DECL_DECLARED_INLINE_P (newdecl) = 1;
1466 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1467 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1470 if (DECL_BUILT_IN (olddecl))
1472 /* Get rid of any built-in function if new arg types don't match it
1473 or if we have a function definition. */
1474 if (! types_match || new_is_definition)
1476 if (! different_binding_level)
1478 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1479 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1484 /* If redeclaring a builtin function, and not a definition,
1485 it stays built in. */
1486 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1487 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1491 /* Also preserve various other info from the definition. */
1492 if (! new_is_definition)
1494 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1495 /* When called with different_binding_level set, don't copy over
1496 DECL_INITIAL, so that we don't accidentally change function
1497 declarations into function definitions. */
1498 if (! different_binding_level)
1499 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1500 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1501 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1502 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
1503 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1505 /* Set DECL_INLINE on the declaration if we've got a body
1506 from which to instantiate. */
1507 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1509 DECL_INLINE (newdecl) = 1;
1510 DECL_ABSTRACT_ORIGIN (newdecl)
1511 = (different_binding_level
1512 ? DECL_ORIGIN (olddecl)
1513 : DECL_ABSTRACT_ORIGIN (olddecl));
1518 /* If a previous declaration said inline, mark the
1519 definition as inlinable. */
1520 if (DECL_DECLARED_INLINE_P (newdecl)
1521 && ! DECL_UNINLINABLE (newdecl))
1522 DECL_INLINE (newdecl) = 1;
1525 if (different_binding_level)
1528 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1529 But preserve OLDDECL's DECL_UID. */
1531 unsigned olddecl_uid = DECL_UID (olddecl);
1533 memcpy ((char *) olddecl + sizeof (struct tree_common),
1534 (char *) newdecl + sizeof (struct tree_common),
1535 sizeof (struct tree_decl) - sizeof (struct tree_common));
1536 DECL_UID (olddecl) = olddecl_uid;
1539 /* NEWDECL contains the merged attribute lists.
1540 Update OLDDECL to be the same. */
1541 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1546 /* Return any external DECL associated with ID, whether or not it is
1547 currently in scope. */
1549 any_external_decl (id)
1552 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1555 if (decl && TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1558 t = purpose_member (id, truly_local_externals);
1560 return TREE_VALUE (t);
1565 /* Record an external decl DECL. This only does something if a
1566 shadowing decl already exists. */
1568 record_external_decl (decl)
1571 tree name = DECL_NAME (decl);
1572 if (!IDENTIFIER_SYMBOL_VALUE (name))
1575 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1578 /* Check whether decl-node X shadows an existing declaration.
1579 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1580 which might be a NULL_TREE. */
1582 warn_if_shadowing (x, old)
1587 /* Nothing to shadow? */
1589 /* Shadow warnings not wanted? */
1591 /* No shadow warnings for internally generated vars. */
1592 || DECL_SOURCE_LINE (x) == 0
1593 /* No shadow warnings for vars made for inlining. */
1594 || DECL_FROM_INLINE (x)
1595 /* Don't warn about the parm names in function declarator
1596 within a function declarator.
1597 It would be nice to avoid warning in any function
1598 declarator in a declaration, as opposed to a definition,
1599 but there is no way to tell it's not a definition. */
1600 || (TREE_CODE (x) == PARM_DECL
1601 && current_binding_level->level_chain->parm_flag))
1604 name = IDENTIFIER_POINTER (DECL_NAME (x));
1606 if (TREE_CODE (old) == PARM_DECL)
1607 shadow_warning (SW_PARAM, name, old);
1608 else if (DECL_CONTEXT (old) == 0)
1609 shadow_warning (SW_GLOBAL, name, old);
1611 shadow_warning (SW_LOCAL, name, old);
1615 /* Subroutine of pushdecl.
1617 X is a TYPE_DECL for a typedef statement. Create a brand new
1618 ..._TYPE node (which will be just a variant of the existing
1619 ..._TYPE node with identical properties) and then install X
1620 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1622 The whole point here is to end up with a situation where each
1623 and every ..._TYPE node the compiler creates will be uniquely
1624 associated with AT MOST one node representing a typedef name.
1625 This way, even though the compiler substitutes corresponding
1626 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1627 early on, later parts of the compiler can always do the reverse
1628 translation and get back the corresponding typedef name. For
1631 typedef struct S MY_TYPE;
1634 Later parts of the compiler might only know that `object' was of
1635 type `struct S' if it were not for code just below. With this
1636 code however, later parts of the compiler see something like:
1638 struct S' == struct S
1639 typedef struct S' MY_TYPE;
1642 And they can then deduce (from the node for type struct S') that
1643 the original object declaration was:
1647 Being able to do this is important for proper support of protoize,
1648 and also for generating precise symbolic debugging information
1649 which takes full account of the programmer's (typedef) vocabulary.
1651 Obviously, we don't want to generate a duplicate ..._TYPE node if
1652 the TYPE_DECL node that we are now processing really represents a
1653 standard built-in type.
1655 Since all standard types are effectively declared at line zero
1656 in the source file, we can easily check to see if we are working
1657 on a standard type by checking the current value of lineno. */
1660 clone_underlying_type (x)
1663 if (DECL_SOURCE_LINE (x) == 0)
1665 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1666 TYPE_NAME (TREE_TYPE (x)) = x;
1668 else if (TREE_TYPE (x) != error_mark_node
1669 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1671 tree tt = TREE_TYPE (x);
1672 DECL_ORIGINAL_TYPE (x) = tt;
1673 tt = build_type_copy (tt);
1675 TREE_USED (tt) = TREE_USED (x);
1680 /* Record a decl-node X as belonging to the current lexical scope.
1681 Check for errors (such as an incompatible declaration for the same
1682 name already seen in the same scope).
1684 Returns either X or an old decl for the same name.
1685 If an old decl is returned, it may have been smashed
1686 to agree with what X says. */
1692 tree name = DECL_NAME (x);
1693 struct binding_level *scope = current_binding_level;
1695 #ifdef ENABLE_CHECKING
1696 if (error_mark_node == 0)
1697 /* Called too early. */
1701 /* Functions need the lang_decl data. */
1702 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1703 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
1704 ggc_alloc_cleared (sizeof (struct lang_decl));
1706 /* A local extern declaration for a function doesn't constitute nesting.
1707 A local auto declaration does, since it's a forward decl
1708 for a nested function coming later. */
1709 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1710 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
1711 DECL_CONTEXT (x) = 0;
1713 DECL_CONTEXT (x) = current_function_decl;
1719 if (warn_nested_externs
1720 && scope != global_binding_level
1721 && DECL_EXTERNAL (x)
1722 && !DECL_IN_SYSTEM_HEADER (x))
1723 warning ("nested extern declaration of `%s'",
1724 IDENTIFIER_POINTER (name));
1726 old = lookup_name_current_level (name);
1727 if (old && duplicate_decls (x, old, 0))
1729 if (DECL_EXTERNAL (x) || scope == global_binding_level)
1731 /* Find and check against a previous, not-in-scope, external
1732 decl for this identifier. (C99 s???: If two declarations
1733 with external linkage, referring to the same object, have
1734 incompatible types, the behavior is undefined). */
1735 tree ext = any_external_decl (name);
1738 if (duplicate_decls (x, ext, scope != global_binding_level))
1739 x = copy_node (ext);
1742 record_external_decl (x);
1745 if (TREE_CODE (x) == TYPE_DECL)
1746 clone_underlying_type (x);
1748 /* If storing a local value, there may already be one
1749 (inherited). If so, record it for restoration when this
1750 binding level ends. Take care not to do this if we are
1751 replacing an older decl in the same binding level (i.e.
1752 duplicate_decls returned false, above). */
1753 if (scope != global_binding_level
1754 && IDENTIFIER_SYMBOL_VALUE (name)
1755 && IDENTIFIER_SYMBOL_VALUE (name) != old)
1757 warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
1758 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1762 /* Install the new declaration in the requested binding level. */
1763 IDENTIFIER_SYMBOL_VALUE (name) = x;
1764 C_DECL_INVISIBLE (x) = 0;
1766 /* Keep list of variables in this level with incomplete type.
1767 If the input is erroneous, we can have error_mark in the type
1768 slot (e.g. "f(void a, ...)") - that doesn't count as an
1770 if (TREE_TYPE (x) != error_mark_node
1771 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1773 tree element = TREE_TYPE (x);
1775 while (TREE_CODE (element) == ARRAY_TYPE)
1776 element = TREE_TYPE (element);
1777 if (TREE_CODE (element) == RECORD_TYPE
1778 || TREE_CODE (element) == UNION_TYPE)
1779 scope->incomplete_list = tree_cons (NULL_TREE, x,
1780 scope->incomplete_list);
1784 /* Put decls on list in reverse order.
1785 We will reverse them later if necessary. */
1786 TREE_CHAIN (x) = scope->names;
1792 /* Record X as belonging to the global scope (C99 "file scope").
1793 This is used only internally by the Objective C front end,
1794 and is limited to its needs. It will hork if there is _any_
1795 visible binding for X (not just a global one). */
1797 pushdecl_top_level (x)
1802 if (TREE_CODE (x) != VAR_DECL)
1805 name = DECL_NAME (x);
1806 old = IDENTIFIER_SYMBOL_VALUE (name);
1810 if (DECL_CONTEXT (old))
1813 if (!duplicate_decls (x, old, 0))
1819 DECL_CONTEXT (x) = 0;
1820 IDENTIFIER_SYMBOL_VALUE (name) = x;
1821 TREE_CHAIN (x) = global_binding_level->names;
1822 global_binding_level->names = x;
1826 /* Record X as belonging to the outermost scope of the current
1827 function. This is used only internally, by c_make_fname_decl and
1828 build_external_ref, and is limited to their needs. The NAME is
1829 provided as a separate argument because build_external_ref wants to
1830 use error_mark_node for X. For VAR_DECLs, duplicate_decls is not
1831 called; if there is any preexisting decl for this identifier, it is
1834 pushdecl_function_level (x, name)
1838 struct binding_level *scope;
1840 scope = current_binding_level;
1841 while (scope->function_body == 0)
1842 scope = scope->level_chain;
1846 if (x == error_mark_node)
1847 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1849 else if (TREE_CODE (x) == VAR_DECL)
1851 if (name != DECL_NAME (x))
1853 if (IDENTIFIER_SYMBOL_VALUE (name))
1856 DECL_CONTEXT (x) = current_function_decl;
1857 TREE_CHAIN (x) = scope->names;
1861 IDENTIFIER_SYMBOL_VALUE (name) = x;
1865 /* Generate an implicit declaration for identifier FUNCTIONID as a
1866 function of type int (). */
1869 implicitly_declare (functionid)
1872 tree decl = any_external_decl (functionid);
1874 if (decl && decl != error_mark_node)
1876 /* Implicit declaration of a function already declared
1877 (somehow) in a different scope, or as a built-in.
1878 If this is the first time this has happened, warn;
1879 then recycle the old declaration. */
1880 if (!C_DECL_IMPLICIT (decl))
1882 implicit_decl_warning (DECL_NAME (decl));
1883 if (DECL_CONTEXT (decl))
1884 warning_with_decl (decl, "previous declaration of `%s'");
1885 C_DECL_IMPLICIT (decl) = 1;
1887 return pushdecl (decl);
1890 /* Not seen before. */
1891 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1892 DECL_EXTERNAL (decl) = 1;
1893 TREE_PUBLIC (decl) = 1;
1894 C_DECL_IMPLICIT (decl) = 1;
1895 implicit_decl_warning (functionid);
1897 /* ANSI standard says implicit declarations are in the innermost block.
1898 So we record the decl in the standard fashion. */
1899 decl = pushdecl (decl);
1901 /* No need to call objc_check_decl here - it's a function type. */
1902 rest_of_decl_compilation (decl, NULL, 0, 0);
1904 /* Write a record describing this implicit function declaration to the
1905 prototypes file (if requested). */
1907 gen_aux_info_record (decl, 0, 1, 0);
1909 /* Possibly apply some default attributes to this implicit declaration. */
1910 decl_attributes (&decl, NULL_TREE, 0);
1916 implicit_decl_warning (id)
1919 const char *name = IDENTIFIER_POINTER (id);
1920 if (mesg_implicit_function_declaration == 2)
1921 error ("implicit declaration of function `%s'", name);
1922 else if (mesg_implicit_function_declaration == 1)
1923 warning ("implicit declaration of function `%s'", name);
1926 /* Return zero if the declaration NEWDECL is valid
1927 when the declaration OLDDECL (assumed to be for the same name)
1928 has already been seen.
1929 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
1930 and 3 if it is a conflicting declaration. */
1933 redeclaration_error_message (newdecl, olddecl)
1934 tree newdecl, olddecl;
1936 if (TREE_CODE (newdecl) == TYPE_DECL)
1938 /* Do not complain about type redeclarations where at least one
1939 declaration was in a system header. */
1940 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
1944 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1946 /* Declarations of functions can insist on internal linkage
1947 but they can't be inconsistent with internal linkage,
1948 so there can be no error on that account.
1949 However defining the same name twice is no good. */
1950 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
1951 /* However, defining once as extern inline and a second
1952 time in another way is ok. */
1953 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
1954 && ! (DECL_DECLARED_INLINE_P (newdecl)
1955 && DECL_EXTERNAL (newdecl))))
1959 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
1961 /* Objects declared at top level: */
1962 /* If at least one is a reference, it's ok. */
1963 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
1965 /* Reject two definitions. */
1966 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
1968 /* Now we have two tentative defs, or one tentative and one real def. */
1969 /* Insist that the linkage match. */
1970 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
1974 else if (current_binding_level->parm_flag
1975 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1979 /* Newdecl has block scope. If olddecl has block scope also, then
1980 reject two definitions, and reject a definition together with an
1981 external reference. Otherwise, it is OK, because newdecl must
1982 be an extern reference to olddecl. */
1983 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
1984 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
1990 /* Get the LABEL_DECL corresponding to identifier ID as a label.
1991 Create one if none exists so far for the current function.
1992 This function is called for both label definitions and label references. */
1998 tree decl = IDENTIFIER_LABEL_VALUE (id);
2000 if (current_function_decl == 0)
2002 error ("label %s referenced outside of any function",
2003 IDENTIFIER_POINTER (id));
2007 /* Use a label already defined or ref'd with this name. */
2010 /* But not if it is inherited and wasn't declared to be inheritable. */
2011 if (DECL_CONTEXT (decl) != current_function_decl
2012 && ! C_DECLARED_LABEL_FLAG (decl))
2013 return shadow_label (id);
2017 decl = build_decl (LABEL_DECL, id, void_type_node);
2019 /* A label not explicitly declared must be local to where it's ref'd. */
2020 DECL_CONTEXT (decl) = current_function_decl;
2022 DECL_MODE (decl) = VOIDmode;
2024 /* Say where one reference is to the label,
2025 for the sake of the error if it is not defined. */
2026 DECL_SOURCE_LINE (decl) = lineno;
2027 DECL_SOURCE_FILE (decl) = input_filename;
2029 IDENTIFIER_LABEL_VALUE (id) = decl;
2031 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2036 /* Make a label named NAME in the current function,
2037 shadowing silently any that may be inherited from containing functions
2038 or containing scopes.
2040 Note that valid use, if the label being shadowed
2041 comes from another scope in the same function,
2042 requires calling declare_nonlocal_label right away. */
2048 tree decl = IDENTIFIER_LABEL_VALUE (name);
2054 /* Check to make sure that the label hasn't already been declared
2055 at this label scope */
2056 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2057 if (TREE_VALUE (dup) == decl)
2059 error ("duplicate label declaration `%s'",
2060 IDENTIFIER_POINTER (name));
2061 error_with_decl (TREE_VALUE (dup),
2062 "this is a previous declaration");
2063 /* Just use the previous declaration. */
2064 return lookup_label (name);
2067 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2068 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2071 return lookup_label (name);
2074 /* Define a label, specifying the location in the source file.
2075 Return the LABEL_DECL node for the label, if the definition is valid.
2076 Otherwise return 0. */
2079 define_label (filename, line, name)
2080 const char *filename;
2084 tree decl = lookup_label (name);
2086 /* If label with this name is known from an outer context, shadow it. */
2087 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2089 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2090 IDENTIFIER_LABEL_VALUE (name) = 0;
2091 decl = lookup_label (name);
2094 if (warn_traditional && !in_system_header && lookup_name (name))
2095 warning_with_file_and_line (filename, line,
2096 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2097 IDENTIFIER_POINTER (name));
2099 if (DECL_INITIAL (decl) != 0)
2101 error_with_file_and_line (filename, line, "duplicate label `%s'",
2102 IDENTIFIER_POINTER (name));
2107 /* Mark label as having been defined. */
2108 DECL_INITIAL (decl) = error_mark_node;
2109 /* Say where in the source. */
2110 DECL_SOURCE_FILE (decl) = filename;
2111 DECL_SOURCE_LINE (decl) = line;
2116 /* Return the list of declarations of the current level.
2117 Note that this list is in reverse order unless/until
2118 you nreverse it; and when you do nreverse it, you must
2119 store the result back using `storedecls' or you will lose. */
2124 return current_binding_level->names;
2127 /* Return the list of type-tags (for structs, etc) of the current level. */
2132 return current_binding_level->tags;
2135 /* Store the list of declarations of the current level.
2136 This is done for the parameter declarations of a function being defined,
2137 after they are modified in the light of any missing parameters. */
2143 current_binding_level->names = decls;
2146 /* Similarly, store the list of tags of the current level. */
2152 current_binding_level->tags = tags;
2155 /* Given NAME, an IDENTIFIER_NODE,
2156 return the structure (or union or enum) definition for that name.
2157 If THISLEVEL_ONLY is nonzero, searches only the current_binding_level.
2158 CODE says which kind of type the caller wants;
2159 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2160 If the wrong kind of type is found, an error is reported. */
2163 lookup_tag (code, name, thislevel_only)
2164 enum tree_code code;
2168 tree tag = IDENTIFIER_TAG_VALUE (name);
2174 /* We only care about whether it's in this level if
2175 thislevel_only was set or it might be a type clash. */
2176 if (thislevel_only || TREE_CODE (tag) != code)
2178 if (current_binding_level == global_binding_level
2179 || purpose_member (name, current_binding_level->tags))
2183 if (thislevel_only && !thislevel)
2186 if (TREE_CODE (tag) != code)
2188 /* Definition isn't the kind we were looking for. */
2189 pending_invalid_xref = name;
2190 pending_invalid_xref_file = input_filename;
2191 pending_invalid_xref_line = lineno;
2193 /* If in the same binding level as a declaration as a tag
2194 of a different type, this must not be allowed to
2195 shadow that tag, so give the error immediately.
2196 (For example, "struct foo; union foo;" is invalid.) */
2198 pending_xref_error ();
2203 /* Print an error message now
2204 for a recent invalid struct, union or enum cross reference.
2205 We don't print them immediately because they are not invalid
2206 when used in the `struct foo;' construct for shadowing. */
2209 pending_xref_error ()
2211 if (pending_invalid_xref != 0)
2212 error_with_file_and_line (pending_invalid_xref_file,
2213 pending_invalid_xref_line,
2214 "`%s' defined as wrong kind of tag",
2215 IDENTIFIER_POINTER (pending_invalid_xref));
2216 pending_invalid_xref = 0;
2220 /* Look up NAME in the current binding level and its superiors
2221 in the namespace of variables, functions and typedefs.
2222 Return a ..._DECL node of some kind representing its definition,
2223 or return 0 if it is undefined. */
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 (name)
2243 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2245 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2248 if (current_binding_level == global_binding_level)
2251 /* Scan the current scope for a decl with name NAME. */
2252 if (chain_member (decl, current_binding_level->names))
2258 /* Create the predefined scalar types of C,
2259 and some nodes representing standard constants (0, 1, (void *) 0).
2260 Initialize the global binding level.
2261 Make definitions for built-in primitive functions. */
2264 c_init_decl_processing ()
2267 tree ptr_ftype_void, ptr_ftype_ptr;
2269 /* Adds some ggc roots, and reserved words for c-parse.in. */
2272 current_function_decl = NULL;
2273 named_labels = NULL;
2274 current_binding_level = NULL_BINDING_LEVEL;
2275 free_binding_level = NULL_BINDING_LEVEL;
2277 /* Make the binding_level structure for global names. */
2279 global_binding_level = current_binding_level;
2281 build_common_tree_nodes (flag_signed_char);
2283 c_common_nodes_and_builtins ();
2285 boolean_type_node = integer_type_node;
2286 boolean_true_node = integer_one_node;
2287 boolean_false_node = integer_zero_node;
2289 c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
2290 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2291 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2292 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2293 TYPE_PRECISION (c_bool_type_node) = 1;
2294 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2296 c_bool_false_node = build_int_2 (0, 0);
2297 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2298 c_bool_true_node = build_int_2 (1, 0);
2299 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2301 endlink = void_list_node;
2302 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2304 = build_function_type (ptr_type_node,
2305 tree_cons (NULL_TREE, ptr_type_node, endlink));
2307 pedantic_lvalues = pedantic;
2309 make_fname_decl = c_make_fname_decl;
2310 start_fname_decls ();
2313 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2314 decl, NAME is the initialization string and TYPE_DEP indicates whether
2315 NAME depended on the type of the function. As we don't yet implement
2316 delayed emission of static data, we mark the decl as emitted
2317 so it is not placed in the output. Anything using it must therefore pull
2318 out the STRING_CST initializer directly. This does mean that these names
2319 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2322 c_make_fname_decl (id, type_dep)
2326 const char *name = fname_as_string (type_dep);
2327 tree decl, type, init;
2328 size_t length = strlen (name);
2330 type = build_array_type
2331 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2332 build_index_type (size_int (length)));
2334 decl = build_decl (VAR_DECL, id, type);
2336 TREE_STATIC (decl) = 1;
2337 TREE_READONLY (decl) = 1;
2338 DECL_ARTIFICIAL (decl) = 1;
2340 init = build_string (length + 1, name);
2341 TREE_TYPE (init) = type;
2342 DECL_INITIAL (decl) = init;
2344 TREE_USED (decl) = 1;
2346 if (current_function_decl)
2347 pushdecl_function_level (decl, DECL_NAME (decl));
2349 finish_decl (decl, init, NULL_TREE);
2354 /* Return a definition for a builtin function named NAME and whose data type
2355 is TYPE. TYPE should be a function type with argument types.
2356 FUNCTION_CODE tells later passes how to compile calls to this function.
2357 See tree.h for its possible values.
2359 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2360 the name to be called if we can't opencode the function. If
2361 ATTRS is nonzero, use that for the function's attribute list. */
2364 builtin_function (name, type, function_code, class, library_name, attrs)
2368 enum built_in_class class;
2369 const char *library_name;
2372 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2373 DECL_EXTERNAL (decl) = 1;
2374 TREE_PUBLIC (decl) = 1;
2376 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2377 make_decl_rtl (decl, NULL);
2379 DECL_BUILT_IN_CLASS (decl) = class;
2380 DECL_FUNCTION_CODE (decl) = function_code;
2382 /* Warn if a function in the namespace for users
2383 is used without an occasion to consider it declared. */
2384 if (name[0] != '_' || name[1] != '_')
2385 C_DECL_INVISIBLE (decl) = 1;
2387 /* Possibly apply some default attributes to this built-in function. */
2389 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2391 decl_attributes (&decl, NULL_TREE, 0);
2396 /* Apply default attributes to a function, if a system function with default
2400 c_insert_default_attributes (decl)
2403 if (!TREE_PUBLIC (decl))
2405 c_common_insert_default_attributes (decl);
2408 /* Called when a declaration is seen that contains no names to declare.
2409 If its type is a reference to a structure, union or enum inherited
2410 from a containing scope, shadow that tag name for the current scope
2411 with a forward reference.
2412 If its type defines a new named structure or union
2413 or defines an enum, it is valid but we need not do anything here.
2414 Otherwise, it is an error. */
2417 shadow_tag (declspecs)
2420 shadow_tag_warned (declspecs, 0);
2424 shadow_tag_warned (declspecs, warned)
2427 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2434 pending_invalid_xref = 0;
2436 /* Remove the attributes from declspecs, since they will confuse the
2438 split_specs_attrs (declspecs, &specs, &attrs);
2440 for (link = specs; link; link = TREE_CHAIN (link))
2442 tree value = TREE_VALUE (link);
2443 enum tree_code code = TREE_CODE (value);
2445 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2446 /* Used to test also that TYPE_SIZE (value) != 0.
2447 That caused warning for `struct foo;' at top level in the file. */
2449 tree name = TYPE_NAME (value);
2456 if (warned != 1 && code != ENUMERAL_TYPE)
2457 /* Empty unnamed enum OK */
2459 pedwarn ("unnamed struct/union that defines no instances");
2465 t = lookup_tag (code, name, 1);
2469 t = make_node (code);
2476 if (!warned && ! in_system_header)
2478 warning ("useless keyword or type name in empty declaration");
2485 error ("two types specified in one empty declaration");
2490 pedwarn ("empty declaration");
2494 /* Construct an array declarator. EXPR is the expression inside [], or
2495 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2496 to the pointer to which a parameter array is converted). STATIC_P is
2497 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2498 is nonzero is the array is [*], a VLA of unspecified length which is
2499 nevertheless a complete type (not currently implemented by GCC),
2500 zero otherwise. The declarator is constructed as an ARRAY_REF
2501 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2502 left of the [] (filled by in set_array_declarator_type) and operand 1
2503 is the expression inside; whose TREE_TYPE is the type qualifiers and
2504 which has TREE_STATIC set if "static" is used. */
2507 build_array_declarator (expr, quals, static_p, vla_unspec_p)
2514 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2515 TREE_TYPE (decl) = quals;
2516 TREE_STATIC (decl) = (static_p ? 1 : 0);
2517 if (pedantic && !flag_isoc99)
2519 if (static_p || quals != NULL_TREE)
2520 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2522 pedwarn ("ISO C90 does not support `[*]' array declarators");
2525 warning ("GCC does not yet properly implement `[*]' array declarators");
2529 /* Set the type of an array declarator. DECL is the declarator, as
2530 constructed by build_array_declarator; TYPE is what appears on the left
2531 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2532 abstract declarator, zero otherwise; this is used to reject static and
2533 type qualifiers in abstract declarators, where they are not in the
2537 set_array_declarator_type (decl, type, abstract_p)
2542 TREE_OPERAND (decl, 0) = type;
2543 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2544 error ("static or type qualifiers in abstract declarator");
2548 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2551 groktypename (typename)
2556 if (TREE_CODE (typename) != TREE_LIST)
2559 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2561 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
2563 /* Apply attributes. */
2564 decl_attributes (&typename, attrs, 0);
2569 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2572 groktypename_in_parm_context (typename)
2575 if (TREE_CODE (typename) != TREE_LIST)
2577 return grokdeclarator (TREE_VALUE (typename),
2578 TREE_PURPOSE (typename),
2582 /* Decode a declarator in an ordinary declaration or data definition.
2583 This is called as soon as the type information and variable name
2584 have been parsed, before parsing the initializer if any.
2585 Here we create the ..._DECL node, fill in its type,
2586 and put it on the list of decls for the current context.
2587 The ..._DECL node is returned as the value.
2589 Exception: for arrays where the length is not specified,
2590 the type is left null, to be filled in by `finish_decl'.
2592 Function definitions do not come here; they go to start_function
2593 instead. However, external and forward declarations of functions
2594 do go through here. Structure field declarations are done by
2595 grokfield and not through here. */
2598 start_decl (declarator, declspecs, initialized, attributes)
2599 tree declarator, declspecs;
2606 /* An object declared as __attribute__((deprecated)) suppresses
2607 warnings of uses of other deprecated items. */
2608 if (lookup_attribute ("deprecated", attributes))
2609 deprecated_state = DEPRECATED_SUPPRESS;
2611 decl = grokdeclarator (declarator, declspecs,
2612 NORMAL, initialized);
2614 deprecated_state = DEPRECATED_NORMAL;
2616 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2617 && MAIN_NAME_P (DECL_NAME (decl)))
2618 warning_with_decl (decl, "`%s' is usually a function");
2621 /* Is it valid for this decl to have an initializer at all?
2622 If not, set INITIALIZED to zero, which will indirectly
2623 tell `finish_decl' to ignore the initializer once it is parsed. */
2624 switch (TREE_CODE (decl))
2627 error ("typedef `%s' is initialized (use __typeof__ instead)",
2628 IDENTIFIER_POINTER (DECL_NAME (decl)));
2633 error ("function `%s' is initialized like a variable",
2634 IDENTIFIER_POINTER (DECL_NAME (decl)));
2639 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2640 error ("parameter `%s' is initialized",
2641 IDENTIFIER_POINTER (DECL_NAME (decl)));
2646 /* Don't allow initializations for incomplete types
2647 except for arrays which might be completed by the initialization. */
2649 /* This can happen if the array size is an undefined macro. We already
2650 gave a warning, so we don't need another one. */
2651 if (TREE_TYPE (decl) == error_mark_node)
2653 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2655 /* A complete type is ok if size is fixed. */
2657 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2658 || C_DECL_VARIABLE_SIZE (decl))
2660 error ("variable-sized object may not be initialized");
2664 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2666 error ("variable `%s' has initializer but incomplete type",
2667 IDENTIFIER_POINTER (DECL_NAME (decl)));
2670 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2672 error ("elements of array `%s' have incomplete type",
2673 IDENTIFIER_POINTER (DECL_NAME (decl)));
2681 /* Seems redundant with grokdeclarator. */
2682 if (current_binding_level != global_binding_level
2683 && DECL_EXTERNAL (decl)
2684 && TREE_CODE (decl) != FUNCTION_DECL)
2685 warning ("declaration of `%s' has `extern' and is initialized",
2686 IDENTIFIER_POINTER (DECL_NAME (decl)));
2688 DECL_EXTERNAL (decl) = 0;
2689 if (current_binding_level == global_binding_level)
2690 TREE_STATIC (decl) = 1;
2692 /* Tell `pushdecl' this is an initialized decl
2693 even though we don't yet have the initializer expression.
2694 Also tell `finish_decl' it may store the real initializer. */
2695 DECL_INITIAL (decl) = error_mark_node;
2698 /* If this is a function declaration, write a record describing it to the
2699 prototypes file (if requested). */
2701 if (TREE_CODE (decl) == FUNCTION_DECL)
2702 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2704 /* ANSI specifies that a tentative definition which is not merged with
2705 a non-tentative definition behaves exactly like a definition with an
2706 initializer equal to zero. (Section 3.7.2)
2708 -fno-common gives strict ANSI behavior, though this tends to break
2709 a large body of code that grew up without this rule.
2711 Thread-local variables are never common, since there's no entrenched
2712 body of code to break, and it allows more efficient variable references
2713 in the presence of dynamic linking. */
2715 if (TREE_CODE (decl) == VAR_DECL
2717 && TREE_PUBLIC (decl)
2718 && !DECL_THREAD_LOCAL (decl)
2720 DECL_COMMON (decl) = 1;
2722 /* Set attributes here so if duplicate decl, will have proper attributes. */
2723 decl_attributes (&decl, attributes, 0);
2725 /* If #pragma weak was used, mark the decl weak now. */
2726 if (current_binding_level == global_binding_level)
2727 maybe_apply_pragma_weak (decl);
2729 if (TREE_CODE (decl) == FUNCTION_DECL
2730 && DECL_DECLARED_INLINE_P (decl)
2731 && DECL_UNINLINABLE (decl)
2732 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2733 warning_with_decl (decl,
2734 "inline function `%s' given attribute noinline");
2736 /* Add this decl to the current binding level.
2737 TEM may equal DECL or it may be a previous decl of the same name. */
2738 tem = pushdecl (decl);
2740 /* For a local variable, define the RTL now. */
2741 if (current_binding_level != global_binding_level
2742 /* But not if this is a duplicate decl
2743 and we preserved the rtl from the previous one
2744 (which may or may not happen). */
2745 && !DECL_RTL_SET_P (tem)
2746 && !DECL_CONTEXT (tem))
2748 if (TREE_TYPE (tem) != error_mark_node
2749 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
2751 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2752 && DECL_INITIAL (tem) != 0)
2759 /* Finish processing of a declaration;
2760 install its initial value.
2761 If the length of an array type is not known before,
2762 it must be determined now, from the initial value, or it is an error. */
2765 finish_decl (decl, init, asmspec_tree)
2769 tree type = TREE_TYPE (decl);
2770 int was_incomplete = (DECL_SIZE (decl) == 0);
2771 const char *asmspec = 0;
2773 /* If a name was specified, get the string. */
2774 if (current_binding_level == global_binding_level)
2775 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2777 asmspec = TREE_STRING_POINTER (asmspec_tree);
2779 /* If `start_decl' didn't like having an initialization, ignore it now. */
2780 if (init != 0 && DECL_INITIAL (decl) == 0)
2783 /* Don't crash if parm is initialized. */
2784 if (TREE_CODE (decl) == PARM_DECL)
2788 store_init_value (decl, init);
2790 /* Deduce size of array from initialization, if not already known */
2791 if (TREE_CODE (type) == ARRAY_TYPE
2792 && TYPE_DOMAIN (type) == 0
2793 && TREE_CODE (decl) != TYPE_DECL)
2796 = (TREE_STATIC (decl)
2797 /* Even if pedantic, an external linkage array
2798 may have incomplete type at first. */
2799 ? pedantic && !TREE_PUBLIC (decl)
2800 : !DECL_EXTERNAL (decl));
2802 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2804 /* Get the completed type made by complete_array_type. */
2805 type = TREE_TYPE (decl);
2808 error_with_decl (decl, "initializer fails to determine size of `%s'");
2810 else if (failure == 2)
2813 error_with_decl (decl, "array size missing in `%s'");
2814 /* If a `static' var's size isn't known,
2815 make it extern as well as static, so it does not get
2817 If it is not `static', then do not mark extern;
2818 finish_incomplete_decl will give it a default size
2819 and it will get allocated. */
2820 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2821 DECL_EXTERNAL (decl) = 1;
2824 /* TYPE_MAX_VALUE is always one less than the number of elements
2825 in the array, because we start counting at zero. Therefore,
2826 warn only if the value is less than zero. */
2827 else if (pedantic && TYPE_DOMAIN (type) != 0
2828 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2829 error_with_decl (decl, "zero or negative size array `%s'");
2831 layout_decl (decl, 0);
2834 if (TREE_CODE (decl) == VAR_DECL)
2836 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2837 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2838 layout_decl (decl, 0);
2840 if (DECL_SIZE (decl) == 0
2841 /* Don't give an error if we already gave one earlier. */
2842 && TREE_TYPE (decl) != error_mark_node
2843 && (TREE_STATIC (decl)
2845 /* A static variable with an incomplete type
2846 is an error if it is initialized.
2847 Also if it is not file scope.
2848 Otherwise, let it through, but if it is not `extern'
2849 then it may cause an error message later. */
2850 (DECL_INITIAL (decl) != 0
2851 || DECL_CONTEXT (decl) != 0)
2853 /* An automatic variable with an incomplete type
2855 !DECL_EXTERNAL (decl)))
2857 error_with_decl (decl, "storage size of `%s' isn't known");
2858 TREE_TYPE (decl) = error_mark_node;
2861 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2862 && DECL_SIZE (decl) != 0)
2864 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2865 constant_expression_warning (DECL_SIZE (decl));
2867 error_with_decl (decl, "storage size of `%s' isn't constant");
2870 if (TREE_USED (type))
2871 TREE_USED (decl) = 1;
2874 /* If this is a function and an assembler name is specified, it isn't
2875 builtin any more. Also reset DECL_RTL so we can give it its new
2877 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2879 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
2880 SET_DECL_RTL (decl, NULL_RTX);
2881 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
2884 /* Output the assembler code and/or RTL code for variables and functions,
2885 unless the type is an undefined structure or union.
2886 If not, it will get done when the type is completed. */
2888 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2890 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2892 objc_check_decl (decl);
2894 if (!DECL_CONTEXT (decl))
2896 if (DECL_INITIAL (decl) == NULL_TREE
2897 || DECL_INITIAL (decl) == error_mark_node)
2898 /* Don't output anything
2899 when a tentative file-scope definition is seen.
2900 But at end of compilation, do output code for them. */
2901 DECL_DEFER_OUTPUT (decl) = 1;
2902 rest_of_decl_compilation (decl, asmspec,
2903 (DECL_CONTEXT (decl) == 0
2904 || TREE_ASM_WRITTEN (decl)), 0);
2908 /* This is a local variable. If there is an ASMSPEC, the
2909 user has requested that we handle it specially. */
2912 /* In conjunction with an ASMSPEC, the `register'
2913 keyword indicates that we should place the variable
2914 in a particular register. */
2915 if (DECL_REGISTER (decl))
2916 DECL_C_HARD_REGISTER (decl) = 1;
2918 /* If this is not a static variable, issue a warning.
2919 It doesn't make any sense to give an ASMSPEC for an
2920 ordinary, non-register local variable. Historically,
2921 GCC has accepted -- but ignored -- the ASMSPEC in
2923 if (TREE_CODE (decl) == VAR_DECL
2924 && !DECL_REGISTER (decl)
2925 && !TREE_STATIC (decl))
2926 warning_with_decl (decl,
2927 "ignoring asm-specifier for non-static local variable `%s'");
2929 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
2932 if (TREE_CODE (decl) != FUNCTION_DECL)
2933 add_decl_stmt (decl);
2936 if (DECL_CONTEXT (decl) != 0)
2938 /* Recompute the RTL of a local array now
2939 if it used to be an incomplete type. */
2941 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2943 /* If we used it already as memory, it must stay in memory. */
2944 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2945 /* If it's still incomplete now, no init will save it. */
2946 if (DECL_SIZE (decl) == 0)
2947 DECL_INITIAL (decl) = 0;
2952 if (TREE_CODE (decl) == TYPE_DECL)
2954 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2956 objc_check_decl (decl);
2957 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
2960 /* At the end of a declaration, throw away any variable type sizes
2961 of types defined inside that declaration. There is no use
2962 computing them in the following function definition. */
2963 if (current_binding_level == global_binding_level)
2964 get_pending_sizes ();
2967 /* Given a parsed parameter declaration,
2968 decode it into a PARM_DECL and push that on the current binding level.
2969 Also, for the sake of forward parm decls,
2970 record the given order of parms in `parm_order'. */
2973 push_parm_decl (parm)
2977 int old_immediate_size_expand = immediate_size_expand;
2978 /* Don't try computing parm sizes now -- wait till fn is called. */
2979 immediate_size_expand = 0;
2981 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
2982 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
2983 decl_attributes (&decl, TREE_VALUE (parm), 0);
2986 if (DECL_NAME (decl))
2989 olddecl = lookup_name (DECL_NAME (decl));
2990 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
2991 pedwarn_with_decl (decl,
2992 "ISO C forbids parameter `%s' shadowing typedef");
2996 decl = pushdecl (decl);
2998 immediate_size_expand = old_immediate_size_expand;
3000 current_binding_level->parm_order
3001 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3003 /* Add this decl to the current binding level. */
3004 finish_decl (decl, NULL_TREE, NULL_TREE);
3007 /* Clear the given order of parms in `parm_order'.
3008 Used at start of parm list,
3009 and also at semicolon terminating forward decls. */
3014 current_binding_level->parm_order = NULL_TREE;
3017 static GTY(()) int compound_literal_number;
3019 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3020 literal, which may be an incomplete array type completed by the
3021 initializer; INIT is a CONSTRUCTOR that initializes the compound
3025 build_compound_literal (type, init)
3029 /* We do not use start_decl here because we have a type, not a declarator;
3030 and do not use finish_decl because the decl should be stored inside
3031 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3032 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3035 DECL_EXTERNAL (decl) = 0;
3036 TREE_PUBLIC (decl) = 0;
3037 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3038 DECL_CONTEXT (decl) = current_function_decl;
3039 TREE_USED (decl) = 1;
3040 TREE_TYPE (decl) = type;
3041 TREE_READONLY (decl) = TREE_READONLY (type);
3042 store_init_value (decl, init);
3044 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3046 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3051 type = TREE_TYPE (decl);
3052 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3053 return error_mark_node;
3055 stmt = build_stmt (DECL_STMT, decl);
3056 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3057 TREE_SIDE_EFFECTS (complit) = 1;
3059 layout_decl (decl, 0);
3061 if (TREE_STATIC (decl))
3063 /* This decl needs a name for the assembler output. We also need
3064 a unique suffix to be added to the name. */
3067 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3068 compound_literal_number);
3069 compound_literal_number++;
3070 DECL_NAME (decl) = get_identifier (name);
3071 DECL_DEFER_OUTPUT (decl) = 1;
3072 DECL_COMDAT (decl) = 1;
3073 DECL_ARTIFICIAL (decl) = 1;
3075 rest_of_decl_compilation (decl, NULL, 1, 0);
3081 /* Make TYPE a complete type based on INITIAL_VALUE.
3082 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3083 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3086 complete_array_type (type, initial_value, do_default)
3091 tree maxindex = NULL_TREE;
3096 /* Note MAXINDEX is really the maximum index,
3097 one less than the size. */
3098 if (TREE_CODE (initial_value) == STRING_CST)
3101 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3102 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3105 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3107 tree elts = CONSTRUCTOR_ELTS (initial_value);
3108 maxindex = build_int_2 (-1, -1);
3109 for (; elts; elts = TREE_CHAIN (elts))
3111 if (TREE_PURPOSE (elts))
3112 maxindex = TREE_PURPOSE (elts);
3114 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3115 maxindex, integer_one_node));
3117 maxindex = copy_node (maxindex);
3121 /* Make an error message unless that happened already. */
3122 if (initial_value != error_mark_node)
3125 /* Prevent further error messages. */
3126 maxindex = build_int_2 (0, 0);
3133 maxindex = build_int_2 (0, 0);
3139 TYPE_DOMAIN (type) = build_index_type (maxindex);
3140 if (!TREE_TYPE (maxindex))
3141 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3144 /* Lay out the type now that we can get the real answer. */
3151 /* Determine whether TYPE is a structure with a flexible array member,
3152 or a union containing such a structure (possibly recursively). */
3155 flexible_array_type_p (type)
3159 switch (TREE_CODE (type))
3162 x = TYPE_FIELDS (type);
3165 while (TREE_CHAIN (x) != NULL_TREE)
3167 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3168 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3169 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3170 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3174 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3176 if (flexible_array_type_p (TREE_TYPE (x)))
3185 /* Given declspecs and a declarator,
3186 determine the name and type of the object declared
3187 and construct a ..._DECL node for it.
3188 (In one case we can return a ..._TYPE node instead.
3189 For invalid input we sometimes return 0.)
3191 DECLSPECS is a chain of tree_list nodes whose value fields
3192 are the storage classes and type specifiers.
3194 DECL_CONTEXT says which syntactic context this declaration is in:
3195 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3196 FUNCDEF for a function definition. Like NORMAL but a few different
3197 error messages in each case. Return value may be zero meaning
3198 this definition is too screwy to try to parse.
3199 PARM for a parameter declaration (either within a function prototype
3200 or before a function body). Make a PARM_DECL, or return void_type_node.
3201 TYPENAME if for a typename (in a cast or sizeof).
3202 Don't make a DECL node; just return the ..._TYPE node.
3203 FIELD for a struct or union field; make a FIELD_DECL.
3204 BITFIELD for a field with specified width.
3205 INITIALIZED is 1 if the decl has an initializer.
3207 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3208 It may also be so in the PARM case, for a prototype where the
3209 argument type is specified but not the name.
3211 This function is where the complicated C meanings of `static'
3212 and `extern' are interpreted. */
3215 grokdeclarator (declarator, declspecs, decl_context, initialized)
3218 enum decl_context decl_context;
3223 tree type = NULL_TREE;
3228 int type_quals = TYPE_UNQUALIFIED;
3230 int explicit_int = 0;
3231 int explicit_char = 0;
3232 int defaulted_int = 0;
3233 tree typedef_decl = 0;
3235 tree typedef_type = 0;
3236 int funcdef_flag = 0;
3237 enum tree_code innermost_code = ERROR_MARK;
3239 int size_varies = 0;
3240 tree decl_attr = NULL_TREE;
3241 tree array_ptr_quals = NULL_TREE;
3242 int array_parm_static = 0;
3243 tree returned_attrs = NULL_TREE;
3245 if (decl_context == BITFIELD)
3246 bitfield = 1, decl_context = FIELD;
3248 if (decl_context == FUNCDEF)
3249 funcdef_flag = 1, decl_context = NORMAL;
3251 /* Look inside a declarator for the name being declared
3252 and get it as a string, for an error message. */
3254 tree decl = declarator;
3258 switch (TREE_CODE (decl))
3263 innermost_code = TREE_CODE (decl);
3264 decl = TREE_OPERAND (decl, 0);
3268 decl = TREE_VALUE (decl);
3271 case IDENTIFIER_NODE:
3272 name = IDENTIFIER_POINTER (decl);
3283 /* A function definition's declarator must have the form of
3284 a function declarator. */
3286 if (funcdef_flag && innermost_code != CALL_EXPR)
3289 /* Anything declared one level down from the top level
3290 must be one of the parameters of a function
3291 (because the body is at least two levels down). */
3293 /* If this looks like a function definition, make it one,
3294 even if it occurs where parms are expected.
3295 Then store_parm_decls will reject it and not use it as a parm. */
3296 if (decl_context == NORMAL && !funcdef_flag
3297 && current_binding_level->parm_flag)
3298 decl_context = PARM;
3300 /* Look through the decl specs and record which ones appear.
3301 Some typespecs are defined as built-in typenames.
3302 Others, the ones that are modifiers of other types,
3303 are represented by bits in SPECBITS: set the bits for
3304 the modifiers that appear. Storage class keywords are also in SPECBITS.
3306 If there is a typedef name or a type, store the type in TYPE.
3307 This includes builtin typedefs such as `int'.
3309 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3310 and did not come from a user typedef.
3312 Set LONGLONG if `long' is mentioned twice. */
3314 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3316 tree id = TREE_VALUE (spec);
3318 /* If the entire declaration is itself tagged as deprecated then
3319 suppress reports of deprecated items. */
3320 if (id && TREE_DEPRECATED (id))
3322 if (deprecated_state != DEPRECATED_SUPPRESS)
3323 warn_deprecated_use (id);
3326 if (id == ridpointers[(int) RID_INT])
3328 if (id == ridpointers[(int) RID_CHAR])
3331 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3333 enum rid i = C_RID_CODE (id);
3334 if ((int) i <= (int) RID_LAST_MODIFIER)
3336 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3339 error ("`long long long' is too long for GCC");
3342 if (pedantic && !flag_isoc99 && ! in_system_header
3344 pedwarn ("ISO C90 does not support `long long'");
3348 else if (specbits & (1 << (int) i))
3350 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3353 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3356 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3359 /* Diagnose "__thread extern". Recall that this list
3360 is in the reverse order seen in the text. */
3362 && (specbits & (1 << (int) RID_EXTERN
3363 | 1 << (int) RID_STATIC)))
3365 if (specbits & 1 << (int) RID_EXTERN)
3366 error ("`__thread' before `extern'");
3368 error ("`__thread' before `static'");
3371 specbits |= 1 << (int) i;
3376 error ("two or more data types in declaration of `%s'", name);
3377 /* Actual typedefs come to us as TYPE_DECL nodes. */
3378 else if (TREE_CODE (id) == TYPE_DECL)
3380 if (TREE_TYPE (id) == error_mark_node)
3381 ; /* Allow the type to default to int to avoid cascading errors. */
3384 type = TREE_TYPE (id);
3385 decl_attr = DECL_ATTRIBUTES (id);
3389 /* Built-in types come as identifiers. */
3390 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3392 tree t = lookup_name (id);
3393 if (TREE_TYPE (t) == error_mark_node)
3395 else if (!t || TREE_CODE (t) != TYPE_DECL)
3396 error ("`%s' fails to be a typedef or built in type",
3397 IDENTIFIER_POINTER (id));
3400 type = TREE_TYPE (t);
3404 else if (TREE_CODE (id) != ERROR_MARK)
3411 typedef_type = type;
3413 size_varies = C_TYPE_VARIABLE_SIZE (type);
3415 /* No type at all: default to `int', and set DEFAULTED_INT
3416 because it was not a user-defined typedef. */
3420 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3421 | (1 << (int) RID_SIGNED)
3422 | (1 << (int) RID_UNSIGNED)
3423 | (1 << (int) RID_COMPLEX))))
3424 /* Don't warn about typedef foo = bar. */
3425 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3426 && ! in_system_header)
3428 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3429 and this is a function, or if -Wimplicit; prefer the former
3430 warning since it is more explicit. */
3431 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3433 warn_about_return_type = 1;
3434 else if (warn_implicit_int || flag_isoc99)
3435 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3440 type = integer_type_node;
3443 /* Now process the modifiers that were specified
3444 and check for invalid combinations. */
3446 /* Long double is a special combination. */
3448 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3449 && TYPE_MAIN_VARIANT (type) == double_type_node)
3451 specbits &= ~(1 << (int) RID_LONG);
3452 type = long_double_type_node;
3455 /* Check all other uses of type modifiers. */
3457 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3458 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3462 if ((specbits & 1 << (int) RID_LONG)
3463 && (specbits & 1 << (int) RID_SHORT))
3464 error ("both long and short specified for `%s'", name);
3465 else if (((specbits & 1 << (int) RID_LONG)
3466 || (specbits & 1 << (int) RID_SHORT))
3468 error ("long or short specified with char for `%s'", name);
3469 else if (((specbits & 1 << (int) RID_LONG)
3470 || (specbits & 1 << (int) RID_SHORT))
3471 && TREE_CODE (type) == REAL_TYPE)
3473 static int already = 0;
3475 error ("long or short specified with floating type for `%s'", name);
3476 if (! already && ! pedantic)
3478 error ("the only valid combination is `long double'");
3482 else if ((specbits & 1 << (int) RID_SIGNED)
3483 && (specbits & 1 << (int) RID_UNSIGNED))
3484 error ("both signed and unsigned specified for `%s'", name);
3485 else if (TREE_CODE (type) != INTEGER_TYPE)
3486 error ("long, short, signed or unsigned invalid for `%s'", name);
3490 if (!explicit_int && !defaulted_int && !explicit_char)
3492 error ("long, short, signed or unsigned used invalidly for `%s'",
3498 /* Discard the type modifiers if they are invalid. */
3501 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3502 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3507 if ((specbits & (1 << (int) RID_COMPLEX))
3508 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3510 error ("complex invalid for `%s'", name);
3511 specbits &= ~(1 << (int) RID_COMPLEX);
3514 /* Decide whether an integer type is signed or not.
3515 Optionally treat bitfields as signed by default. */
3516 if (specbits & 1 << (int) RID_UNSIGNED
3517 || (bitfield && ! flag_signed_bitfields
3518 && (explicit_int || defaulted_int || explicit_char
3519 /* A typedef for plain `int' without `signed'
3520 can be controlled just like plain `int'. */
3521 || ! (typedef_decl != 0
3522 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3523 && TREE_CODE (type) != ENUMERAL_TYPE
3524 && !(specbits & 1 << (int) RID_SIGNED)))
3527 type = long_long_unsigned_type_node;
3528 else if (specbits & 1 << (int) RID_LONG)
3529 type = long_unsigned_type_node;
3530 else if (specbits & 1 << (int) RID_SHORT)
3531 type = short_unsigned_type_node;
3532 else if (type == char_type_node)
3533 type = unsigned_char_type_node;
3534 else if (typedef_decl)
3535 type = c_common_unsigned_type (type);
3537 type = unsigned_type_node;
3539 else if ((specbits & 1 << (int) RID_SIGNED)
3540 && type == char_type_node)
3541 type = signed_char_type_node;
3543 type = long_long_integer_type_node;
3544 else if (specbits & 1 << (int) RID_LONG)
3545 type = long_integer_type_node;
3546 else if (specbits & 1 << (int) RID_SHORT)
3547 type = short_integer_type_node;
3549 if (specbits & 1 << (int) RID_COMPLEX)
3551 if (pedantic && !flag_isoc99)
3552 pedwarn ("ISO C90 does not support complex types");
3553 /* If we just have "complex", it is equivalent to
3554 "complex double", but if any modifiers at all are specified it is
3555 the complex form of TYPE. E.g, "complex short" is
3556 "complex short int". */
3558 if (defaulted_int && ! longlong
3559 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3560 | (1 << (int) RID_SIGNED)
3561 | (1 << (int) RID_UNSIGNED))))
3564 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3565 type = complex_double_type_node;
3567 else if (type == integer_type_node)
3570 pedwarn ("ISO C does not support complex integer types");
3571 type = complex_integer_type_node;
3573 else if (type == float_type_node)
3574 type = complex_float_type_node;
3575 else if (type == double_type_node)
3576 type = complex_double_type_node;
3577 else if (type == long_double_type_node)
3578 type = complex_long_double_type_node;
3582 pedwarn ("ISO C does not support complex integer types");
3583 type = build_complex_type (type);
3587 /* Figure out the type qualifiers for the declaration. There are
3588 two ways a declaration can become qualified. One is something
3589 like `const int i' where the `const' is explicit. Another is
3590 something like `typedef const int CI; CI i' where the type of the
3591 declaration contains the `const'. */
3592 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3593 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
3594 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3595 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3596 if (constp > 1 && ! flag_isoc99)
3597 pedwarn ("duplicate `const'");
3598 if (restrictp > 1 && ! flag_isoc99)
3599 pedwarn ("duplicate `restrict'");
3600 if (volatilep > 1 && ! flag_isoc99)
3601 pedwarn ("duplicate `volatile'");
3602 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3603 type = TYPE_MAIN_VARIANT (type);
3604 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3605 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3606 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3608 /* Warn if two storage classes are given. Default to `auto'. */
3613 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3614 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3615 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3616 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3617 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3619 /* "static __thread" and "extern __thread" are allowed. */
3620 if ((specbits & (1 << (int) RID_THREAD
3621 | 1 << (int) RID_STATIC
3622 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3625 /* Warn about storage classes that are invalid for certain
3626 kinds of declarations (parameters, typenames, etc.). */
3629 error ("multiple storage classes in declaration of `%s'", name);
3630 else if (funcdef_flag
3632 & ((1 << (int) RID_REGISTER)
3633 | (1 << (int) RID_AUTO)
3634 | (1 << (int) RID_TYPEDEF)
3635 | (1 << (int) RID_THREAD))))
3637 if (specbits & 1 << (int) RID_AUTO
3638 && (pedantic || current_binding_level == global_binding_level))
3639 pedwarn ("function definition declared `auto'");
3640 if (specbits & 1 << (int) RID_REGISTER)
3641 error ("function definition declared `register'");
3642 if (specbits & 1 << (int) RID_TYPEDEF)
3643 error ("function definition declared `typedef'");
3644 if (specbits & 1 << (int) RID_THREAD)
3645 error ("function definition declared `__thread'");
3646 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3647 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3649 else if (decl_context != NORMAL && nclasses > 0)
3651 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3655 switch (decl_context)
3658 error ("storage class specified for structure field `%s'",
3662 error ("storage class specified for parameter `%s'", name);
3665 error ("storage class specified for typename");
3668 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3669 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3670 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3673 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3675 /* `extern' with initialization is invalid if not at top level. */
3676 if (current_binding_level == global_binding_level)
3677 warning ("`%s' initialized and declared `extern'", name);
3679 error ("`%s' has both `extern' and initializer", name);
3681 else if (current_binding_level == global_binding_level)
3683 if (specbits & 1 << (int) RID_AUTO)
3684 error ("top-level declaration of `%s' specifies `auto'", name);
3688 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3689 error ("nested function `%s' declared `extern'", name);
3690 else if ((specbits & (1 << (int) RID_THREAD
3691 | 1 << (int) RID_EXTERN
3692 | 1 << (int) RID_STATIC))
3693 == (1 << (int) RID_THREAD))
3695 error ("function-scope `%s' implicitly auto and declared `__thread'",
3697 specbits &= ~(1 << (int) RID_THREAD);
3702 /* Now figure out the structure of the declarator proper.
3703 Descend through it, creating more complex types, until we reach
3704 the declared identifier (or NULL_TREE, in an absolute declarator). */
3706 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3708 if (type == error_mark_node)
3710 declarator = TREE_OPERAND (declarator, 0);
3714 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3715 an INDIRECT_REF (for *...),
3716 a CALL_EXPR (for ...(...)),
3717 a TREE_LIST (for nested attributes),
3718 an identifier (for the name being declared)
3719 or a null pointer (for the place in an absolute declarator
3720 where the name was omitted).
3721 For the last two cases, we have just exited the loop.
3723 At this point, TYPE is the type of elements of an array,
3724 or for a function to return, or for a pointer to point to.
3725 After this sequence of ifs, TYPE is the type of the
3726 array or function or pointer, and DECLARATOR has had its
3727 outermost layer removed. */
3729 if (array_ptr_quals != NULL_TREE || array_parm_static)
3731 /* Only the innermost declarator (making a parameter be of
3732 array type which is converted to pointer type)
3733 may have static or type qualifiers. */
3734 error ("static or type qualifiers in non-parameter array declarator");
3735 array_ptr_quals = NULL_TREE;
3736 array_parm_static = 0;
3739 if (TREE_CODE (declarator) == TREE_LIST)
3741 /* We encode a declarator with embedded attributes using
3743 tree attrs = TREE_PURPOSE (declarator);
3746 declarator = TREE_VALUE (declarator);
3747 inner_decl = declarator;
3748 while (inner_decl != NULL_TREE
3749 && TREE_CODE (inner_decl) == TREE_LIST)
3750 inner_decl = TREE_VALUE (inner_decl);
3751 if (inner_decl == NULL_TREE
3752 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3753 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3754 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3755 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3756 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3757 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3758 returned_attrs = decl_attributes (&type,
3759 chainon (returned_attrs, attrs),
3762 else if (TREE_CODE (declarator) == ARRAY_REF)
3764 tree itype = NULL_TREE;
3765 tree size = TREE_OPERAND (declarator, 1);
3766 /* The index is a signed object `sizetype' bits wide. */
3767 tree index_type = c_common_signed_type (sizetype);
3769 array_ptr_quals = TREE_TYPE (declarator);
3770 array_parm_static = TREE_STATIC (declarator);
3772 declarator = TREE_OPERAND (declarator, 0);
3774 /* Check for some types that there cannot be arrays of. */
3776 if (VOID_TYPE_P (type))
3778 error ("declaration of `%s' as array of voids", name);
3779 type = error_mark_node;
3782 if (TREE_CODE (type) == FUNCTION_TYPE)
3784 error ("declaration of `%s' as array of functions", name);
3785 type = error_mark_node;
3788 if (pedantic && flexible_array_type_p (type))
3789 pedwarn ("invalid use of structure with flexible array member");
3791 if (size == error_mark_node)
3792 type = error_mark_node;
3794 if (type == error_mark_node)
3797 /* If size was specified, set ITYPE to a range-type for that size.
3798 Otherwise, ITYPE remains null. finish_decl may figure it out
3799 from an initial value. */
3803 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3804 STRIP_TYPE_NOPS (size);
3806 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3808 error ("size of array `%s' has non-integer type", name);
3809 size = integer_one_node;
3812 if (pedantic && integer_zerop (size))
3813 pedwarn ("ISO C forbids zero-size array `%s'", name);
3815 if (TREE_CODE (size) == INTEGER_CST)
3817 constant_expression_warning (size);
3818 if (tree_int_cst_sgn (size) < 0)
3820 error ("size of array `%s' is negative", name);
3821 size = integer_one_node;
3826 /* Make sure the array size remains visibly nonconstant
3827 even if it is (eg) a const variable with known value. */
3830 if (!flag_isoc99 && pedantic)
3832 if (TREE_CONSTANT (size))
3833 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3836 pedwarn ("ISO C90 forbids variable-size array `%s'",
3841 if (integer_zerop (size))
3843 /* A zero-length array cannot be represented with an
3844 unsigned index type, which is what we'll get with
3845 build_index_type. Create an open-ended range instead. */
3846 itype = build_range_type (sizetype, size, NULL_TREE);
3850 /* Compute the maximum valid index, that is, size - 1.
3851 Do the calculation in index_type, so that if it is
3852 a variable the computations will be done in the
3854 itype = fold (build (MINUS_EXPR, index_type,
3855 convert (index_type, size),
3856 convert (index_type, size_one_node)));
3858 /* If that overflowed, the array is too big.
3859 ??? While a size of INT_MAX+1 technically shouldn't
3860 cause an overflow (because we subtract 1), the overflow
3861 is recorded during the conversion to index_type, before
3862 the subtraction. Handling this case seems like an
3863 unnecessary complication. */
3864 if (TREE_OVERFLOW (itype))
3866 error ("size of array `%s' is too large", name);
3867 type = error_mark_node;
3873 /* We must be able to distinguish the
3874 SAVE_EXPR_CONTEXT for the variably-sized type
3875 so that we can set it correctly in
3876 set_save_expr_context. The convention is
3877 that all SAVE_EXPRs that need to be reset
3878 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3879 tree cfd = current_function_decl;
3880 if (decl_context == PARM)
3881 current_function_decl = NULL_TREE;
3882 itype = variable_size (itype);
3883 if (decl_context == PARM)
3884 current_function_decl = cfd;
3886 itype = build_index_type (itype);
3889 else if (decl_context == FIELD)
3891 if (pedantic && !flag_isoc99 && !in_system_header)
3892 pedwarn ("ISO C90 does not support flexible array members");
3894 /* ISO C99 Flexible array members are effectively identical
3895 to GCC's zero-length array extension. */
3896 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3899 /* If pedantic, complain about arrays of incomplete types. */
3901 if (pedantic && !COMPLETE_TYPE_P (type))
3902 pedwarn ("array type has incomplete element type");
3905 /* We shouldn't have a function type here at all!
3906 Functions aren't allowed as array elements. */
3907 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
3908 && (constp || volatilep))
3909 pedwarn ("ISO C forbids const or volatile function types");
3912 /* Build the array type itself, then merge any constancy or
3913 volatility into the target type. We must do it in this order
3914 to ensure that the TYPE_MAIN_VARIANT field of the array type
3915 is set correctly. */
3917 type = build_array_type (type, itype);
3919 type = c_build_qualified_type (type, type_quals);
3922 C_TYPE_VARIABLE_SIZE (type) = 1;
3924 /* The GCC extension for zero-length arrays differs from
3925 ISO flexible array members in that sizeof yields zero. */
3926 if (size && integer_zerop (size))
3929 TYPE_SIZE (type) = bitsize_zero_node;
3930 TYPE_SIZE_UNIT (type) = size_zero_node;
3932 if (decl_context != PARM
3933 && (array_ptr_quals != NULL_TREE || array_parm_static))
3935 error ("static or type qualifiers in non-parameter array declarator");
3936 array_ptr_quals = NULL_TREE;
3937 array_parm_static = 0;
3940 else if (TREE_CODE (declarator) == CALL_EXPR)
3944 /* Declaring a function type.
3945 Make sure we have a valid type for the function to return. */
3946 if (type == error_mark_node)
3951 /* Warn about some types functions can't return. */
3953 if (TREE_CODE (type) == FUNCTION_TYPE)
3955 error ("`%s' declared as function returning a function", name);
3956 type = integer_type_node;
3958 if (TREE_CODE (type) == ARRAY_TYPE)
3960 error ("`%s' declared as function returning an array", name);
3961 type = integer_type_node;
3964 /* Construct the function type and go to the next
3965 inner layer of declarator. */
3967 arg_types = grokparms (TREE_OPERAND (declarator, 1),
3969 /* Say it's a definition
3970 only for the CALL_EXPR
3971 closest to the identifier. */
3972 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
3973 /* Type qualifiers before the return type of the function
3974 qualify the return type, not the function type. */
3977 /* Type qualifiers on a function return type are normally
3978 permitted by the standard but have no effect, so give a
3979 warning at -Wextra. Qualifiers on a void return type have
3980 meaning as a GNU extension, and are banned on function
3981 definitions in ISO C. FIXME: strictly we shouldn't
3982 pedwarn for qualified void return types except on function
3983 definitions, but not doing so could lead to the undesirable
3984 state of a "volatile void" function return type not being
3985 warned about, and a use of the function being compiled
3986 with GNU semantics, with no diagnostics under -pedantic. */
3987 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
3988 pedwarn ("ISO C forbids qualified void function return type");
3989 else if (extra_warnings
3990 && !(VOID_TYPE_P (type)
3991 && type_quals == TYPE_QUAL_VOLATILE))
3992 warning ("type qualifiers ignored on function return type");
3994 type = c_build_qualified_type (type, type_quals);
3996 type_quals = TYPE_UNQUALIFIED;
3998 type = build_function_type (type, arg_types);
3999 declarator = TREE_OPERAND (declarator, 0);
4001 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4002 the formal parameter list of this FUNCTION_TYPE to point to
4003 the FUNCTION_TYPE node itself. */
4008 for (link = last_function_parm_tags;
4010 link = TREE_CHAIN (link))
4011 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4014 else if (TREE_CODE (declarator) == INDIRECT_REF)
4016 /* Merge any constancy or volatility into the target type
4019 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4021 pedwarn ("ISO C forbids qualified function types");
4023 type = c_build_qualified_type (type, type_quals);
4024 type_quals = TYPE_UNQUALIFIED;
4027 type = build_pointer_type (type);
4029 /* Process a list of type modifier keywords
4030 (such as const or volatile) that were given inside the `*'. */
4032 if (TREE_TYPE (declarator))
4040 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4041 typemodlist = TREE_CHAIN (typemodlist))
4043 tree qualifier = TREE_VALUE (typemodlist);
4045 if (C_IS_RESERVED_WORD (qualifier))
4047 if (C_RID_CODE (qualifier) == RID_CONST)
4049 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4051 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4061 error ("invalid type modifier within pointer declarator");
4062 if (constp > 1 && ! flag_isoc99)
4063 pedwarn ("duplicate `const'");
4064 if (volatilep > 1 && ! flag_isoc99)
4065 pedwarn ("duplicate `volatile'");
4066 if (restrictp > 1 && ! flag_isoc99)
4067 pedwarn ("duplicate `restrict'");
4069 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4070 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4071 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4074 declarator = TREE_OPERAND (declarator, 0);
4081 /* Now TYPE has the actual type. */
4083 /* Did array size calculations overflow? */
4085 if (TREE_CODE (type) == ARRAY_TYPE
4086 && COMPLETE_TYPE_P (type)
4087 && TREE_OVERFLOW (TYPE_SIZE (type)))
4089 error ("size of array `%s' is too large", name);
4090 /* If we proceed with the array type as it is, we'll eventually
4091 crash in tree_low_cst(). */
4092 type = error_mark_node;
4095 /* If this is declaring a typedef name, return a TYPE_DECL. */
4097 if (specbits & (1 << (int) RID_TYPEDEF))
4100 /* Note that the grammar rejects storage classes
4101 in typenames, fields or parameters */
4102 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4104 pedwarn ("ISO C forbids qualified function types");
4106 type = c_build_qualified_type (type, type_quals);
4107 decl = build_decl (TYPE_DECL, declarator, type);
4108 if ((specbits & (1 << (int) RID_SIGNED))
4109 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4110 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4111 decl_attributes (&decl, returned_attrs, 0);
4115 /* Detect the case of an array type of unspecified size
4116 which came, as such, direct from a typedef name.
4117 We must copy the type, so that each identifier gets
4118 a distinct type, so that each identifier's size can be
4119 controlled separately by its own initializer. */
4121 if (type != 0 && typedef_type != 0
4122 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4123 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4125 type = build_array_type (TREE_TYPE (type), 0);
4127 C_TYPE_VARIABLE_SIZE (type) = 1;
4130 /* If this is a type name (such as, in a cast or sizeof),
4131 compute the type and return it now. */
4133 if (decl_context == TYPENAME)
4135 /* Note that the grammar rejects storage classes
4136 in typenames, fields or parameters */
4137 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4139 pedwarn ("ISO C forbids const or volatile function types");
4141 type = c_build_qualified_type (type, type_quals);
4142 decl_attributes (&type, returned_attrs, 0);
4146 /* Aside from typedefs and type names (handle above),
4147 `void' at top level (not within pointer)
4148 is allowed only in public variables.
4149 We don't complain about parms either, but that is because
4150 a better error message can be made later. */
4152 if (VOID_TYPE_P (type) && decl_context != PARM
4153 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4154 && ((specbits & (1 << (int) RID_EXTERN))
4155 || (current_binding_level == global_binding_level
4157 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4159 error ("variable or field `%s' declared void", name);
4160 type = integer_type_node;
4163 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4164 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4169 if (decl_context == PARM)
4171 tree type_as_written;
4174 /* A parameter declared as an array of T is really a pointer to T.
4175 One declared as a function is really a pointer to a function. */
4177 if (TREE_CODE (type) == ARRAY_TYPE)
4179 /* Transfer const-ness of array into that of type pointed to. */
4180 type = TREE_TYPE (type);
4182 type = c_build_qualified_type (type, type_quals);
4183 type = build_pointer_type (type);
4184 type_quals = TYPE_UNQUALIFIED;
4185 if (array_ptr_quals)
4187 tree new_ptr_quals, new_ptr_attrs;
4189 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4190 /* We don't yet implement attributes in this context. */
4191 if (new_ptr_attrs != NULL_TREE)
4192 warning ("attributes in parameter array declarator ignored");
4197 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4199 tree qualifier = TREE_VALUE (new_ptr_quals);
4201 if (C_IS_RESERVED_WORD (qualifier))
4203 if (C_RID_CODE (qualifier) == RID_CONST)
4205 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4207 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4217 error ("invalid type modifier within array declarator");
4219 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4220 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4221 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4225 else if (TREE_CODE (type) == FUNCTION_TYPE)
4227 if (pedantic && type_quals)
4228 pedwarn ("ISO C forbids qualified function types");
4230 type = c_build_qualified_type (type, type_quals);
4231 type = build_pointer_type (type);
4232 type_quals = TYPE_UNQUALIFIED;
4234 else if (type_quals)
4235 type = c_build_qualified_type (type, type_quals);
4237 type_as_written = type;
4239 decl = build_decl (PARM_DECL, declarator, type);
4241 C_DECL_VARIABLE_SIZE (decl) = 1;
4243 /* Compute the type actually passed in the parmlist,
4244 for the case where there is no prototype.
4245 (For example, shorts and chars are passed as ints.)
4246 When there is a prototype, this is overridden later. */
4248 if (type == error_mark_node)
4249 promoted_type = type;
4251 promoted_type = c_type_promotes_to (type);
4253 DECL_ARG_TYPE (decl) = promoted_type;
4254 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4256 else if (decl_context == FIELD)
4258 /* Structure field. It may not be a function. */
4260 if (TREE_CODE (type) == FUNCTION_TYPE)
4262 error ("field `%s' declared as a function", name);
4263 type = build_pointer_type (type);
4265 else if (TREE_CODE (type) != ERROR_MARK
4266 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4268 error ("field `%s' has incomplete type", name);
4269 type = error_mark_node;
4271 /* Move type qualifiers down to element of an array. */
4272 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4274 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4276 TYPE_DOMAIN (type));
4278 /* Leave the field const or volatile as well. */
4279 type_quals = TYPE_UNQUALIFIED;
4282 decl = build_decl (FIELD_DECL, declarator, type);
4283 DECL_NONADDRESSABLE_P (decl) = bitfield;
4286 C_DECL_VARIABLE_SIZE (decl) = 1;
4288 else if (TREE_CODE (type) == FUNCTION_TYPE)
4290 /* Every function declaration is "external"
4291 except for those which are inside a function body
4292 in which `auto' is used.
4293 That is a case not specified by ANSI C,
4294 and we use it for forward declarations for nested functions. */
4295 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4296 || current_binding_level == global_binding_level);
4298 if (specbits & (1 << (int) RID_AUTO)
4299 && (pedantic || current_binding_level == global_binding_level))
4300 pedwarn ("invalid storage class for function `%s'", name);
4301 if (specbits & (1 << (int) RID_REGISTER))
4302 error ("invalid storage class for function `%s'", name);
4303 if (specbits & (1 << (int) RID_THREAD))
4304 error ("invalid storage class for function `%s'", name);
4305 /* Function declaration not at top level.
4306 Storage classes other than `extern' are not allowed
4307 and `extern' makes no difference. */
4308 if (current_binding_level != global_binding_level
4309 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4311 pedwarn ("invalid storage class for function `%s'", name);
4313 decl = build_decl (FUNCTION_DECL, declarator, type);
4314 decl = build_decl_attribute_variant (decl, decl_attr);
4316 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4317 ggc_alloc_cleared (sizeof (struct lang_decl));
4319 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4320 pedwarn ("ISO C forbids qualified function types");
4322 /* GNU C interprets a `volatile void' return type to indicate
4323 that the function does not return. */
4324 if ((type_quals & TYPE_QUAL_VOLATILE)
4325 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4326 warning ("`noreturn' function returns non-void value");
4329 DECL_EXTERNAL (decl) = 1;
4330 /* Record absence of global scope for `static' or `auto'. */
4332 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4335 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4337 /* Record presence of `inline', if it is reasonable. */
4338 if (MAIN_NAME_P (declarator))
4341 warning ("cannot inline function `main'");
4345 /* Assume that otherwise the function can be inlined. */
4346 DECL_DECLARED_INLINE_P (decl) = 1;
4348 /* Do not mark bare declarations as DECL_INLINE. Doing so
4349 in the presence of multiple declarations can result in
4350 the abstract origin pointing between the declarations,
4351 which will confuse dwarf2out. */
4354 DECL_INLINE (decl) = 1;
4355 if (specbits & (1 << (int) RID_EXTERN))
4356 current_extern_inline = 1;
4359 /* If -finline-functions, assume it can be inlined. This does
4360 two things: let the function be deferred until it is actually
4361 needed, and let dwarf2 know that the function is inlinable. */
4362 else if (flag_inline_trees == 2 && initialized)
4364 if (!DECL_INLINE (decl))
4365 DID_INLINE_FUNC (decl) = 1;
4366 DECL_INLINE (decl) = 1;
4367 DECL_DECLARED_INLINE_P (decl) = 0;
4372 /* It's a variable. */
4373 /* An uninitialized decl with `extern' is a reference. */
4374 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4376 /* Move type qualifiers down to element of an array. */
4377 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4379 int saved_align = TYPE_ALIGN(type);
4380 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4382 TYPE_DOMAIN (type));
4383 TYPE_ALIGN (type) = saved_align;
4384 #if 0 /* Leave the variable const or volatile as well. */
4385 type_quals = TYPE_UNQUALIFIED;
4388 else if (type_quals)
4389 type = c_build_qualified_type (type, type_quals);
4391 decl = build_decl (VAR_DECL, declarator, type);
4393 C_DECL_VARIABLE_SIZE (decl) = 1;
4396 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4398 DECL_EXTERNAL (decl) = extern_ref;
4400 /* At top level, the presence of a `static' or `register' storage
4401 class specifier, or the absence of all storage class specifiers
4402 makes this declaration a definition (perhaps tentative). Also,
4403 the absence of both `static' and `register' makes it public. */
4404 if (current_binding_level == global_binding_level)
4406 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4407 | (1 << (int) RID_REGISTER)));
4408 TREE_STATIC (decl) = !extern_ref;
4410 /* Not at top level, only `static' makes a static definition. */
4413 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4414 TREE_PUBLIC (decl) = extern_ref;
4417 if (specbits & 1 << (int) RID_THREAD)
4419 if (targetm.have_tls)
4420 DECL_THREAD_LOCAL (decl) = 1;
4422 /* A mere warning is sure to result in improper semantics
4423 at runtime. Don't bother to allow this to compile. */
4424 error ("thread-local storage not supported for this target");
4428 /* Record `register' declaration for warnings on &
4429 and in case doing stupid register allocation. */
4431 if (specbits & (1 << (int) RID_REGISTER))
4432 DECL_REGISTER (decl) = 1;
4434 /* Record constancy and volatility. */
4435 c_apply_type_quals_to_decl (type_quals, decl);
4437 /* If a type has volatile components, it should be stored in memory.
4438 Otherwise, the fact that those components are volatile
4439 will be ignored, and would even crash the compiler. */
4440 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4441 c_mark_addressable (decl);
4443 decl_attributes (&decl, returned_attrs, 0);
4449 /* Decode the parameter-list info for a function type or function definition.
4450 The argument is the value returned by `get_parm_info' (or made in parse.y
4451 if there is an identifier list instead of a parameter decl list).
4452 These two functions are separate because when a function returns
4453 or receives functions then each is called multiple times but the order
4454 of calls is different. The last call to `grokparms' is always the one
4455 that contains the formal parameter names of a function definition.
4457 Store in `last_function_parms' a chain of the decls of parms.
4458 Also store in `last_function_parm_tags' a chain of the struct, union,
4459 and enum tags declared among the parms.
4461 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4463 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4464 a mere declaration. A nonempty identifier-list gets an error message
4465 when FUNCDEF_FLAG is zero. */
4468 grokparms (parms_info, funcdef_flag)
4472 tree first_parm = TREE_CHAIN (parms_info);
4474 last_function_parms = TREE_PURPOSE (parms_info);
4475 last_function_parm_tags = TREE_VALUE (parms_info);
4477 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4478 && !in_system_header)
4479 warning ("function declaration isn't a prototype");
4482 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4485 pedwarn ("parameter names (without types) in function declaration");
4487 last_function_parms = first_parm;
4494 /* We no longer test FUNCDEF_FLAG.
4495 If the arg types are incomplete in a declaration,
4496 they must include undefined tags.
4497 These tags can never be defined in the scope of the declaration,
4498 so the types can never be completed,
4499 and no call can be compiled successfully. */
4501 /* In a fcn definition, arg types must be complete. */
4504 for (parm = last_function_parms, typelt = first_parm;
4506 parm = TREE_CHAIN (parm))
4507 /* Skip over any enumeration constants declared here. */
4508 if (TREE_CODE (parm) == PARM_DECL)
4510 /* Barf if the parameter itself has an incomplete type. */
4511 tree type = TREE_VALUE (typelt);
4512 if (type == error_mark_node)
4514 if (!COMPLETE_TYPE_P (type))
4516 if (funcdef_flag && DECL_NAME (parm) != 0)
4517 error ("parameter `%s' has incomplete type",
4518 IDENTIFIER_POINTER (DECL_NAME (parm)));
4520 warning ("parameter has incomplete type");
4523 TREE_VALUE (typelt) = error_mark_node;
4524 TREE_TYPE (parm) = error_mark_node;
4528 /* This has been replaced by parm_tags_warning, which
4529 uses a more accurate criterion for what to warn
4533 /* Now warn if is a pointer to an incomplete type. */
4534 while (TREE_CODE (type) == POINTER_TYPE
4535 || TREE_CODE (type) == REFERENCE_TYPE)
4536 type = TREE_TYPE (type);
4537 type = TYPE_MAIN_VARIANT (type);
4538 if (!COMPLETE_TYPE_P (type))
4540 if (DECL_NAME (parm) != 0)
4541 warning ("parameter `%s' points to incomplete type",
4542 IDENTIFIER_POINTER (DECL_NAME (parm)));
4544 warning ("parameter points to incomplete type");
4548 typelt = TREE_CHAIN (typelt);
4555 /* Return a tree_list node with info on a parameter list just parsed.
4556 The TREE_PURPOSE is a chain of decls of those parms.
4557 The TREE_VALUE is a list of structure, union and enum tags defined.
4558 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4559 This tree_list node is later fed to `grokparms'.
4561 VOID_AT_END nonzero means append `void' to the end of the type-list.
4562 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4565 get_parm_info (void_at_end)
4571 tree tags = gettags ();
4572 tree parms = getdecls ();
4574 tree order = current_binding_level->parm_order;
4576 /* Just `void' (and no ellipsis) is special. There are really no parms.
4577 But if the `void' is qualified (by `const' or `volatile') or has a
4578 storage class specifier (`register'), then the behavior is undefined;
4579 by not counting it as the special case of `void' we will cause an
4580 error later. Typedefs for `void' are OK (see DR#157). */
4581 if (void_at_end && parms != 0
4582 && TREE_CHAIN (parms) == 0
4583 && VOID_TYPE_P (TREE_TYPE (parms))
4584 && ! TREE_THIS_VOLATILE (parms)
4585 && ! TREE_READONLY (parms)
4586 && ! DECL_REGISTER (parms)
4587 && DECL_NAME (parms) == 0)
4590 storedecls (NULL_TREE);
4591 return tree_cons (NULL_TREE, NULL_TREE,
4592 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4595 /* Extract enumerator values and other non-parms declared with the parms.
4596 Likewise any forward parm decls that didn't have real parm decls. */
4597 for (decl = parms; decl;)
4599 tree next = TREE_CHAIN (decl);
4601 if (TREE_CODE (decl) != PARM_DECL)
4603 TREE_CHAIN (decl) = new_parms;
4606 else if (TREE_ASM_WRITTEN (decl))
4608 error_with_decl (decl,
4609 "parameter `%s' has just a forward declaration");
4610 TREE_CHAIN (decl) = new_parms;
4616 /* Put the parm decls back in the order they were in in the parm list. */
4617 for (t = order; t; t = TREE_CHAIN (t))
4620 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4622 TREE_CHAIN (TREE_VALUE (t)) = 0;
4625 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4628 /* Store the parmlist in the binding level since the old one
4629 is no longer a valid list. (We have changed the chain pointers.) */
4630 storedecls (new_parms);
4632 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4633 /* There may also be declarations for enumerators if an enumeration
4634 type is declared among the parms. Ignore them here. */
4635 if (TREE_CODE (decl) == PARM_DECL)
4637 /* Since there is a prototype,
4638 args are passed in their declared types. */
4639 tree type = TREE_TYPE (decl);
4640 DECL_ARG_TYPE (decl) = type;
4641 if (PROMOTE_PROTOTYPES
4642 && INTEGRAL_TYPE_P (type)
4643 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4644 DECL_ARG_TYPE (decl) = integer_type_node;
4646 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4647 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
4648 && DECL_NAME (decl) == 0)
4650 error ("`void' in parameter list must be the entire list");
4656 return tree_cons (new_parms, tags,
4657 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
4659 return tree_cons (new_parms, tags, nreverse (types));
4662 /* At end of parameter list, warn about any struct, union or enum tags
4663 defined within. Do so because these types cannot ever become complete. */
4666 parmlist_tags_warning ()
4671 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4673 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4674 /* An anonymous union parm type is meaningful as a GNU extension.
4675 So don't warn for that. */
4676 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
4678 if (TREE_PURPOSE (elt) != 0)
4680 if (code == RECORD_TYPE)
4681 warning ("`struct %s' declared inside parameter list",
4682 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4683 else if (code == UNION_TYPE)
4684 warning ("`union %s' declared inside parameter list",
4685 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4687 warning ("`enum %s' declared inside parameter list",
4688 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4692 /* For translation these need to be separate warnings */
4693 if (code == RECORD_TYPE)
4694 warning ("anonymous struct declared inside parameter list");
4695 else if (code == UNION_TYPE)
4696 warning ("anonymous union declared inside parameter list");
4698 warning ("anonymous enum declared inside parameter list");
4702 warning ("its scope is only this definition or declaration, which is probably not what you want");
4708 /* Get the struct, enum or union (CODE says which) with tag NAME.
4709 Define the tag as a forward-reference if it is not defined. */
4712 xref_tag (code, name)
4713 enum tree_code code;
4716 /* If a cross reference is requested, look up the type
4717 already defined for this tag and return it. */
4719 tree ref = lookup_tag (code, name, 0);
4720 /* If this is the right type of tag, return what we found.
4721 (This reference will be shadowed by shadow_tag later if appropriate.)
4722 If this is the wrong type of tag, do not return it. If it was the
4723 wrong type in the same binding level, we will have had an error
4724 message already; if in a different binding level and declaring
4725 a name, pending_xref_error will give an error message; but if in a
4726 different binding level and not declaring a name, this tag should
4727 shadow the previous declaration of a different type of tag, and
4728 this would not work properly if we return the reference found.
4729 (For example, with "struct foo" in an outer scope, "union foo;"
4730 must shadow that tag with a new one of union type.) */
4731 if (ref && TREE_CODE (ref) == code)
4734 /* If no such tag is yet defined, create a forward-reference node
4735 and record it as the "definition".
4736 When a real declaration of this type is found,
4737 the forward-reference will be altered into a real type. */
4739 ref = make_node (code);
4740 if (code == ENUMERAL_TYPE)
4742 /* Give the type a default layout like unsigned int
4743 to avoid crashing if it does not get defined. */
4744 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4745 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4746 TYPE_USER_ALIGN (ref) = 0;
4747 TREE_UNSIGNED (ref) = 1;
4748 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4749 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4750 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4753 pushtag (name, ref);
4758 /* Make sure that the tag NAME is defined *in the current binding level*
4759 at least as a forward reference.
4760 CODE says which kind of tag NAME ought to be. */
4763 start_struct (code, name)
4764 enum tree_code code;
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 (filename, line, declarator, declspecs, width)
4807 const char *filename ATTRIBUTE_UNUSED;
4808 int line ATTRIBUTE_UNUSED;
4809 tree declarator, declspecs, width;
4813 if (declarator == NULL_TREE && width == NULL_TREE)
4815 /* This is an unnamed decl.
4817 If we have something of the form "union { list } ;" then this
4818 is the anonymous union extension. Similarly for struct.
4820 If this is something of the form "struct foo;", then
4821 If MS extensions are enabled, this is handled as an
4823 Otherwise this is a forward declaration of a structure tag.
4825 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4826 If MS extensions are enabled and foo names a structure, then
4827 again this is an anonymous struct.
4828 Otherwise this is an error.
4830 Oh what a horrid tangled web we weave. I wonder if MS consciously
4831 took this from Plan 9 or if it was an accident of implementation
4832 that took root before someone noticed the bug... */
4834 tree type = TREE_VALUE (declspecs);
4836 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4837 type = TREE_TYPE (type);
4838 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4840 if (flag_ms_extensions)
4843 goto warn_unnamed_field;
4844 else if (TYPE_NAME (type) == NULL)
4847 goto warn_unnamed_field;
4852 warning ("declaration does not declare anything");
4857 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4859 finish_decl (value, NULL_TREE, NULL_TREE);
4860 DECL_INITIAL (value) = width;
4863 objc_check_decl (value);
4867 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4868 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4869 ATTRIBUTES are attributes to be applied to the structure. */
4872 finish_struct (t, fieldlist, attributes)
4878 int toplevel = global_binding_level == current_binding_level;
4879 int saw_named_field;
4881 /* If this type was previously laid out as a forward reference,
4882 make sure we lay it out again. */
4886 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4888 /* Nameless union parm types are useful as GCC extension. */
4889 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4890 /* Otherwise, warn about any struct or union def. in parmlist. */
4891 if (in_parm_level_p ())
4894 pedwarn ("%s defined inside parms",
4895 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4897 warning ("%s defined inside parms",
4898 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4903 for (x = fieldlist; x; x = TREE_CHAIN (x))
4904 if (DECL_NAME (x) != 0)
4908 pedwarn ("%s has no %s",
4909 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4910 fieldlist ? _("named members") : _("members"));
4913 /* Install struct as DECL_CONTEXT of each field decl.
4914 Also process specified field sizes,m which is found in the DECL_INITIAL.
4915 Store 0 there, except for ": 0" fields (so we can find them
4916 and delete them, below). */
4918 saw_named_field = 0;
4919 for (x = fieldlist; x; x = TREE_CHAIN (x))
4921 DECL_CONTEXT (x) = t;
4922 DECL_PACKED (x) |= TYPE_PACKED (t);
4924 /* If any field is const, the structure type is pseudo-const. */
4925 if (TREE_READONLY (x))
4926 C_TYPE_FIELDS_READONLY (t) = 1;
4929 /* A field that is pseudo-const makes the structure likewise. */
4930 tree t1 = TREE_TYPE (x);
4931 while (TREE_CODE (t1) == ARRAY_TYPE)
4932 t1 = TREE_TYPE (t1);
4933 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4934 && C_TYPE_FIELDS_READONLY (t1))
4935 C_TYPE_FIELDS_READONLY (t) = 1;
4938 /* Any field that is volatile means variables of this type must be
4939 treated in some ways as volatile. */
4940 if (TREE_THIS_VOLATILE (x))
4941 C_TYPE_FIELDS_VOLATILE (t) = 1;
4943 /* Any field of nominal variable size implies structure is too. */
4944 if (C_DECL_VARIABLE_SIZE (x))
4945 C_TYPE_VARIABLE_SIZE (t) = 1;
4947 /* Detect invalid nested redefinition. */
4948 if (TREE_TYPE (x) == t)
4949 error ("nested redefinition of `%s'",
4950 IDENTIFIER_POINTER (TYPE_NAME (t)));
4952 /* Detect invalid bit-field size. */
4953 if (DECL_INITIAL (x))
4954 STRIP_NOPS (DECL_INITIAL (x));
4955 if (DECL_INITIAL (x))
4957 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
4958 constant_expression_warning (DECL_INITIAL (x));
4962 "bit-field `%s' width not an integer constant");
4963 DECL_INITIAL (x) = NULL;
4967 /* Detect invalid bit-field type. */
4968 if (DECL_INITIAL (x)
4969 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
4970 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
4971 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
4973 error_with_decl (x, "bit-field `%s' has invalid type");
4974 DECL_INITIAL (x) = NULL;
4977 if (DECL_INITIAL (x) && pedantic
4978 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
4979 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
4980 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
4981 /* Accept an enum that's equivalent to int or unsigned int. */
4982 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
4983 && (TYPE_PRECISION (TREE_TYPE (x))
4984 == TYPE_PRECISION (integer_type_node))))
4985 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
4987 /* Detect and ignore out of range field width and process valid
4989 if (DECL_INITIAL (x))
4992 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
4993 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
4995 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
4996 error_with_decl (x, "negative width in bit-field `%s'");
4997 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
4998 pedwarn_with_decl (x, "width of `%s' exceeds its type");
4999 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5000 error_with_decl (x, "zero width for bit-field `%s'");
5003 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5004 unsigned HOST_WIDE_INT width
5005 = tree_low_cst (DECL_INITIAL (x), 1);
5007 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5008 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5009 TREE_UNSIGNED (TREE_TYPE (x)))
5011 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5012 TREE_UNSIGNED (TREE_TYPE (x))))))
5013 warning_with_decl (x,
5014 "`%s' is narrower than values of its type");
5016 DECL_SIZE (x) = bitsize_int (width);
5017 DECL_BIT_FIELD (x) = 1;
5018 SET_DECL_C_BIT_FIELD (x);
5022 DECL_INITIAL (x) = 0;
5024 /* Detect flexible array member in an invalid context. */
5025 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5026 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5027 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5028 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5030 if (TREE_CODE (t) == UNION_TYPE)
5031 error_with_decl (x, "flexible array member in union");
5032 else if (TREE_CHAIN (x) != NULL_TREE)
5033 error_with_decl (x, "flexible array member not at end of struct");
5034 else if (! saw_named_field)
5035 error_with_decl (x, "flexible array member in otherwise empty struct");
5038 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5039 && flexible_array_type_p (TREE_TYPE (x)))
5040 pedwarn_with_decl (x, "invalid use of structure with flexible array member");
5043 saw_named_field = 1;
5046 /* Delete all duplicate fields from the fieldlist */
5047 for (x = fieldlist; x && TREE_CHAIN (x);)
5048 /* Anonymous fields aren't duplicates. */
5049 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5057 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5063 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5065 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5066 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5072 /* Now we have the nearly final fieldlist. Record it,
5073 then lay out the structure or union (including the fields). */
5075 TYPE_FIELDS (t) = fieldlist;
5079 /* Delete all zero-width bit-fields from the fieldlist */
5081 tree *fieldlistp = &fieldlist;
5083 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5084 *fieldlistp = TREE_CHAIN (*fieldlistp);
5086 fieldlistp = &TREE_CHAIN (*fieldlistp);
5089 /* Now we have the truly final field list.
5090 Store it in this type and in the variants. */
5092 TYPE_FIELDS (t) = fieldlist;
5094 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5096 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5097 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5098 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5099 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5102 /* If this was supposed to be a transparent union, but we can't
5103 make it one, warn and turn off the flag. */
5104 if (TREE_CODE (t) == UNION_TYPE
5105 && TYPE_TRANSPARENT_UNION (t)
5106 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5108 TYPE_TRANSPARENT_UNION (t) = 0;
5109 warning ("union cannot be made transparent");
5112 /* If this structure or union completes the type of any previous
5113 variable declaration, lay it out and output its rtl. */
5115 if (current_binding_level->incomplete_list != NULL_TREE)
5117 tree prev = NULL_TREE;
5119 for (x = current_binding_level->incomplete_list; x; x = TREE_CHAIN (x))
5121 tree decl = TREE_VALUE (x);
5123 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5124 && TREE_CODE (decl) != TYPE_DECL)
5126 layout_decl (decl, 0);
5127 /* This is a no-op in c-lang.c or something real in objc-act.c. */
5129 objc_check_decl (decl);
5130 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5133 /* Unlink X from the incomplete list. */
5135 TREE_CHAIN (prev) = TREE_CHAIN (x);
5137 current_binding_level->incomplete_list = TREE_CHAIN (x);
5139 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5140 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5142 tree element = TREE_TYPE (decl);
5143 while (TREE_CODE (element) == ARRAY_TYPE)
5144 element = TREE_TYPE (element);
5147 layout_array_type (TREE_TYPE (decl));
5148 if (TREE_CODE (decl) != TYPE_DECL)
5150 layout_decl (decl, 0);
5152 objc_check_decl (decl);
5153 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5157 /* Unlink X from the incomplete list. */
5159 TREE_CHAIN (prev) = TREE_CHAIN (x);
5161 current_binding_level->incomplete_list = TREE_CHAIN (x);
5167 /* Finish debugging output for this type. */
5168 rest_of_type_compilation (t, toplevel);
5173 /* Lay out the type T, and its element type, and so on. */
5176 layout_array_type (t)
5179 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5180 layout_array_type (TREE_TYPE (t));
5184 /* Begin compiling the definition of an enumeration type.
5185 NAME is its name (or null if anonymous).
5186 Returns the type object, as yet incomplete.
5187 Also records info about it so that build_enumerator
5188 may be used to declare the individual values as they are read. */
5196 /* If this is the real definition for a previous forward reference,
5197 fill in the contents in the same object that used to be the
5198 forward reference. */
5201 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5203 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5205 enumtype = make_node (ENUMERAL_TYPE);
5206 pushtag (name, enumtype);
5209 C_TYPE_BEING_DEFINED (enumtype) = 1;
5211 if (TYPE_VALUES (enumtype) != 0)
5213 /* This enum is a named one that has been declared already. */
5214 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5216 /* Completely replace its old definition.
5217 The old enumerators remain defined, however. */
5218 TYPE_VALUES (enumtype) = 0;
5221 enum_next_value = integer_zero_node;
5224 if (flag_short_enums)
5225 TYPE_PACKED (enumtype) = 1;
5230 /* After processing and defining all the values of an enumeration type,
5231 install their decls in the enumeration type and finish it off.
5232 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5233 and ATTRIBUTES are the specified attributes.
5234 Returns ENUMTYPE. */
5237 finish_enum (enumtype, values, attributes)
5243 tree minnode = 0, maxnode = 0, enum_value_type;
5244 int precision, unsign;
5245 int toplevel = (global_binding_level == current_binding_level);
5247 if (in_parm_level_p ())
5248 warning ("enum defined inside parms");
5250 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5252 /* Calculate the maximum value of any enumerator in this type. */
5254 if (values == error_mark_node)
5255 minnode = maxnode = integer_zero_node;
5258 minnode = maxnode = TREE_VALUE (values);
5259 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5261 tree value = TREE_VALUE (pair);
5262 if (tree_int_cst_lt (maxnode, value))
5264 if (tree_int_cst_lt (value, minnode))
5269 /* Construct the final type of this enumeration. It is the same
5270 as one of the integral types - the narrowest one that fits, except
5271 that normally we only go as narrow as int - and signed iff any of
5272 the values are negative. */
5273 unsign = (tree_int_cst_sgn (minnode) >= 0);
5274 precision = MAX (min_precision (minnode, unsign),
5275 min_precision (maxnode, unsign));
5276 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5278 tree narrowest = c_common_type_for_size (precision, unsign);
5281 warning ("enumeration values exceed range of largest integer");
5282 narrowest = long_long_integer_type_node;
5285 precision = TYPE_PRECISION (narrowest);
5288 precision = TYPE_PRECISION (integer_type_node);
5290 if (precision == TYPE_PRECISION (integer_type_node))
5291 enum_value_type = c_common_type_for_size (precision, 0);
5293 enum_value_type = enumtype;
5295 TYPE_MIN_VALUE (enumtype) = minnode;
5296 TYPE_MAX_VALUE (enumtype) = maxnode;
5297 TYPE_PRECISION (enumtype) = precision;
5298 TREE_UNSIGNED (enumtype) = unsign;
5299 TYPE_SIZE (enumtype) = 0;
5300 layout_type (enumtype);
5302 if (values != error_mark_node)
5304 /* Change the type of the enumerators to be the enum type. We
5305 need to do this irrespective of the size of the enum, for
5306 proper type checking. Replace the DECL_INITIALs of the
5307 enumerators, and the value slots of the list, with copies
5308 that have the enum type; they cannot be modified in place
5309 because they may be shared (e.g. integer_zero_node) Finally,
5310 change the purpose slots to point to the names of the decls. */
5311 for (pair = values; pair; pair = TREE_CHAIN (pair))
5313 tree enu = TREE_PURPOSE (pair);
5315 TREE_TYPE (enu) = enumtype;
5317 /* The ISO C Standard mandates enumerators to have type int,
5318 even though the underlying type of an enum type is
5319 unspecified. Here we convert any enumerators that fit in
5320 an int to type int, to avoid promotions to unsigned types
5321 when comparing integers with enumerators that fit in the
5322 int range. When -pedantic is given, build_enumerator()
5323 would have already taken care of those that don't fit. */
5324 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5325 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5327 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5329 TREE_PURPOSE (pair) = DECL_NAME (enu);
5330 TREE_VALUE (pair) = DECL_INITIAL (enu);
5333 TYPE_VALUES (enumtype) = values;
5336 /* Fix up all variant types of this enum type. */
5337 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5339 if (tem == enumtype)
5341 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5342 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5343 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5344 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5345 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5346 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5347 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5348 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5349 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5350 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5353 /* Finish debugging output for this type. */
5354 rest_of_type_compilation (enumtype, toplevel);
5359 /* Build and install a CONST_DECL for one value of the
5360 current enumeration type (one that was begun with start_enum).
5361 Return a tree-list containing the CONST_DECL and its value.
5362 Assignment of sequential values by default is handled here. */
5365 build_enumerator (name, value)
5370 /* Validate and default VALUE. */
5372 /* Remove no-op casts from the value. */
5374 STRIP_TYPE_NOPS (value);
5378 if (TREE_CODE (value) == INTEGER_CST)
5380 value = default_conversion (value);
5381 constant_expression_warning (value);
5385 error ("enumerator value for `%s' not integer constant",
5386 IDENTIFIER_POINTER (name));
5391 /* Default based on previous value. */
5392 /* It should no longer be possible to have NON_LVALUE_EXPR
5396 value = enum_next_value;
5398 error ("overflow in enumeration values");
5401 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5403 pedwarn ("ISO C restricts enumerator values to range of `int'");
5404 value = convert (integer_type_node, value);
5407 /* Set basis for default for next value. */
5408 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5409 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5411 /* Now create a declaration for the enum value name. */
5413 type = TREE_TYPE (value);
5414 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5415 TYPE_PRECISION (integer_type_node)),
5416 (TYPE_PRECISION (type)
5417 >= TYPE_PRECISION (integer_type_node)
5418 && TREE_UNSIGNED (type)));
5420 decl = build_decl (CONST_DECL, name, type);
5421 DECL_INITIAL (decl) = convert (type, value);
5424 return tree_cons (decl, value, NULL_TREE);
5428 /* Create the FUNCTION_DECL for a function definition.
5429 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5430 the declaration; they describe the function's name and the type it returns,
5431 but twisted together in a fashion that parallels the syntax of C.
5433 This function creates a binding context for the function body
5434 as well as setting up the FUNCTION_DECL in current_function_decl.
5436 Returns 1 on success. If the DECLARATOR is not suitable for a function
5437 (it defines a datum instead), we return 0, which tells
5438 yyparse to report a parse error. */
5441 start_function (declspecs, declarator, attributes)
5442 tree declarator, declspecs, attributes;
5444 tree decl1, old_decl;
5446 int old_immediate_size_expand = immediate_size_expand;
5448 current_function_returns_value = 0; /* Assume, until we see it does. */
5449 current_function_returns_null = 0;
5450 current_function_returns_abnormally = 0;
5451 warn_about_return_type = 0;
5452 current_extern_inline = 0;
5454 shadowed_labels = 0;
5456 /* Don't expand any sizes in the return type of the function. */
5457 immediate_size_expand = 0;
5459 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5461 /* If the declarator is not suitable for a function definition,
5462 cause a syntax error. */
5465 immediate_size_expand = old_immediate_size_expand;
5469 decl_attributes (&decl1, attributes, 0);
5471 /* If #pragma weak was used, mark the decl weak now. */
5472 if (current_binding_level == global_binding_level)
5473 maybe_apply_pragma_weak (decl1);
5475 if (DECL_DECLARED_INLINE_P (decl1)
5476 && DECL_UNINLINABLE (decl1)
5477 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5478 warning_with_decl (decl1,
5479 "inline function `%s' given attribute noinline");
5481 announce_function (decl1);
5483 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5485 error ("return type is an incomplete type");
5486 /* Make it return void instead. */
5488 = build_function_type (void_type_node,
5489 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5492 if (warn_about_return_type)
5493 pedwarn_c99 ("return type defaults to `int'");
5495 /* Save the parm names or decls from this function's declarator
5496 where store_parm_decls will find them. */
5497 current_function_parms = last_function_parms;
5498 current_function_parm_tags = last_function_parm_tags;
5500 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5501 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5502 DECL_INITIAL (decl1) = error_mark_node;
5504 /* If this definition isn't a prototype and we had a prototype declaration
5505 before, copy the arg type info from that prototype.
5506 But not if what we had before was a builtin function. */
5507 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5508 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5509 && !DECL_BUILT_IN (old_decl)
5510 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5511 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5512 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5514 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5515 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5516 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5519 /* Optionally warn of old-fashioned def with no previous prototype. */
5520 if (warn_strict_prototypes
5521 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5522 && C_DECL_ISNT_PROTOTYPE (old_decl))
5523 warning ("function declaration isn't a prototype");
5524 /* Optionally warn of any global def with no previous prototype. */
5525 else if (warn_missing_prototypes
5526 && TREE_PUBLIC (decl1)
5527 && ! MAIN_NAME_P (DECL_NAME (decl1))
5528 && C_DECL_ISNT_PROTOTYPE (old_decl))
5529 warning_with_decl (decl1, "no previous prototype for `%s'");
5530 /* Optionally warn of any def with no previous prototype
5531 if the function has already been used. */
5532 else if (warn_missing_prototypes
5533 && old_decl != 0 && TREE_USED (old_decl)
5534 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5535 warning_with_decl (decl1,
5536 "`%s' was used with no prototype before its definition");
5537 /* Optionally warn of any global def with no previous declaration. */
5538 else if (warn_missing_declarations
5539 && TREE_PUBLIC (decl1)
5541 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5542 warning_with_decl (decl1, "no previous declaration for `%s'");
5543 /* Optionally warn of any def with no previous declaration
5544 if the function has already been used. */
5545 else if (warn_missing_declarations
5546 && old_decl != 0 && TREE_USED (old_decl)
5547 && C_DECL_IMPLICIT (old_decl))
5548 warning_with_decl (decl1,
5549 "`%s' was used with no declaration before its definition");
5551 /* This is a definition, not a reference.
5552 So normally clear DECL_EXTERNAL.
5553 However, `extern inline' acts like a declaration
5554 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5555 DECL_EXTERNAL (decl1) = current_extern_inline;
5557 /* This function exists in static storage.
5558 (This does not mean `static' in the C sense!) */
5559 TREE_STATIC (decl1) = 1;
5561 /* A nested function is not global. */
5562 if (current_function_decl != 0)
5563 TREE_PUBLIC (decl1) = 0;
5565 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5566 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5571 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5572 != integer_type_node)
5573 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5575 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5576 args = TREE_CHAIN (args))
5578 tree type = args ? TREE_VALUE (args) : 0;
5580 if (type == void_type_node)
5587 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5588 pedwarn_with_decl (decl1,
5589 "first argument of `%s' should be `int'");
5593 if (TREE_CODE (type) != POINTER_TYPE
5594 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5595 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5597 pedwarn_with_decl (decl1,
5598 "second argument of `%s' should be `char **'");
5602 if (TREE_CODE (type) != POINTER_TYPE
5603 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5604 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5606 pedwarn_with_decl (decl1,
5607 "third argument of `%s' should probably be `char **'");
5612 /* It is intentional that this message does not mention the third
5613 argument because it's only mentioned in an appendix of the
5615 if (argct > 0 && (argct < 2 || argct > 3))
5616 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5618 if (! TREE_PUBLIC (decl1))
5619 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5622 /* Record the decl so that the function name is defined.
5623 If we already have a decl for this name, and it is a FUNCTION_DECL,
5624 use the old decl. */
5626 current_function_decl = pushdecl (decl1);
5629 declare_parm_level (1);
5631 make_decl_rtl (current_function_decl, NULL);
5633 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5634 /* Promote the value to int before returning it. */
5635 if (c_promoting_integer_type_p (restype))
5637 /* It retains unsignedness if not really getting wider. */
5638 if (TREE_UNSIGNED (restype)
5639 && (TYPE_PRECISION (restype)
5640 == TYPE_PRECISION (integer_type_node)))
5641 restype = unsigned_type_node;
5643 restype = integer_type_node;
5645 DECL_RESULT (current_function_decl)
5646 = build_decl (RESULT_DECL, NULL_TREE, restype);
5648 /* If this fcn was already referenced via a block-scope `extern' decl
5649 (or an implicit decl), propagate certain information about the usage. */
5650 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5651 TREE_ADDRESSABLE (current_function_decl) = 1;
5653 immediate_size_expand = old_immediate_size_expand;
5655 start_fname_decls ();
5660 /* Store the parameter declarations into the current function declaration.
5661 This is called after parsing the parameter declarations, before
5662 digesting the body of the function.
5664 For an old-style definition, modify the function's type
5665 to specify at least the number of arguments. */
5670 tree fndecl = current_function_decl;
5673 /* This is either a chain of PARM_DECLs (if a prototype was used)
5674 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5675 tree specparms = current_function_parms;
5677 /* This is a list of types declared among parms in a prototype. */
5678 tree parmtags = current_function_parm_tags;
5680 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5681 tree parmdecls = getdecls ();
5683 /* This is a chain of any other decls that came in among the parm
5684 declarations. If a parm is declared with enum {foo, bar} x;
5685 then CONST_DECLs for foo and bar are put here. */
5688 /* The function containing FNDECL, if any. */
5689 tree context = decl_function_context (fndecl);
5691 /* Nonzero if this definition is written with a prototype. */
5694 int saved_warn_shadow = warn_shadow;
5696 /* Don't re-emit shadow warnings. */
5699 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5701 /* This case is when the function was defined with an ANSI prototype.
5702 The parms already have decls, so we need not do anything here
5703 except record them as in effect
5704 and complain if any redundant old-style parm decls were written. */
5715 error_with_decl (fndecl,
5716 "parm types given both in parmlist and separately");
5717 /* Get rid of the erroneous decls; don't keep them on
5718 the list of parms, since they might not be PARM_DECLs. */
5719 for (decl = current_binding_level->names;
5720 decl; decl = TREE_CHAIN (decl))
5721 if (DECL_NAME (decl))
5722 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = 0;
5723 for (link = current_binding_level->shadowed;
5724 link; link = TREE_CHAIN (link))
5725 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5726 current_binding_level->names = 0;
5727 current_binding_level->shadowed = 0;
5730 specparms = nreverse (specparms);
5731 for (parm = specparms; parm; parm = next)
5733 next = TREE_CHAIN (parm);
5734 if (TREE_CODE (parm) == PARM_DECL)
5736 if (DECL_NAME (parm) == 0)
5737 error_with_decl (parm, "parameter name omitted");
5738 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
5739 && VOID_TYPE_P (TREE_TYPE (parm)))
5741 error_with_decl (parm, "parameter `%s' declared void");
5742 /* Change the type to error_mark_node so this parameter
5743 will be ignored by assign_parms. */
5744 TREE_TYPE (parm) = error_mark_node;
5750 /* If we find an enum constant or a type tag,
5751 put it aside for the moment. */
5752 TREE_CHAIN (parm) = 0;
5753 others = chainon (others, parm);
5757 /* Get the decls in their original chain order
5758 and record in the function. */
5759 DECL_ARGUMENTS (fndecl) = getdecls ();
5762 /* If this function takes a variable number of arguments,
5763 add a phony parameter to the end of the parm list,
5764 to represent the position of the first unnamed argument. */
5765 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5768 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5769 /* Let's hope the address of the unnamed parm
5770 won't depend on its type. */
5771 TREE_TYPE (dummy) = integer_type_node;
5772 DECL_ARG_TYPE (dummy) = integer_type_node;
5773 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
5777 /* Now pushdecl the enum constants. */
5778 for (parm = others; parm; parm = next)
5780 next = TREE_CHAIN (parm);
5781 if (DECL_NAME (parm) == 0)
5783 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5785 else if (TREE_CODE (parm) != PARM_DECL)
5789 storetags (chainon (parmtags, gettags ()));
5793 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5794 each with a parm name as the TREE_VALUE.
5796 PARMDECLS is a chain of declarations for parameters.
5797 Warning! It can also contain CONST_DECLs which are not parameters
5798 but are names of enumerators of any enum types
5799 declared among the parameters.
5801 First match each formal parameter name with its declaration.
5802 Associate decls with the names and store the decls
5803 into the TREE_PURPOSE slots. */
5805 /* We use DECL_WEAK as a flag to show which parameters have been
5806 seen already since it is not used on PARM_DECL or CONST_DECL. */
5807 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5808 DECL_WEAK (parm) = 0;
5810 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5812 tree tail, found = NULL;
5814 if (TREE_VALUE (parm) == 0)
5816 error_with_decl (fndecl,
5817 "parameter name missing from parameter list");
5818 TREE_PURPOSE (parm) = 0;
5822 /* See if any of the parmdecls specifies this parm by name.
5823 Ignore any enumerator decls. */
5824 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5825 if (DECL_NAME (tail) == TREE_VALUE (parm)
5826 && TREE_CODE (tail) == PARM_DECL)
5832 /* If declaration already marked, we have a duplicate name.
5833 Complain, and don't use this decl twice. */
5834 if (found && DECL_WEAK (found))
5836 error_with_decl (found, "multiple parameters named `%s'");
5840 /* If the declaration says "void", complain and ignore it. */
5841 if (found && VOID_TYPE_P (TREE_TYPE (found)))
5843 error_with_decl (found, "parameter `%s' declared void");
5844 TREE_TYPE (found) = integer_type_node;
5845 DECL_ARG_TYPE (found) = integer_type_node;
5846 layout_decl (found, 0);
5849 /* If no declaration found, default to int. */
5852 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5854 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5855 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5856 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5858 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
5859 else if (extra_warnings)
5860 warning_with_decl (found, "type of `%s' defaults to `int'");
5864 TREE_PURPOSE (parm) = found;
5866 /* Mark this decl as "already found". */
5867 DECL_WEAK (found) = 1;
5870 /* Put anything which is on the parmdecls chain and which is
5871 not a PARM_DECL onto the list NONPARMS. (The types of
5872 non-parm things which might appear on the list include
5873 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5874 any actual PARM_DECLs not matched with any names. */
5877 for (parm = parmdecls; parm;)
5879 tree next = TREE_CHAIN (parm);
5880 TREE_CHAIN (parm) = 0;
5882 if (TREE_CODE (parm) != PARM_DECL)
5883 nonparms = chainon (nonparms, parm);
5886 /* Complain about args with incomplete types. */
5887 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5889 error_with_decl (parm, "parameter `%s' has incomplete type");
5890 TREE_TYPE (parm) = error_mark_node;
5893 if (! DECL_WEAK (parm))
5895 error_with_decl (parm,
5896 "declaration for parameter `%s' but no such parameter");
5897 /* Pretend the parameter was not missing.
5898 This gets us to a standard state and minimizes
5899 further error messages. */
5901 = chainon (specparms,
5902 tree_cons (parm, NULL_TREE, NULL_TREE));
5909 /* Chain the declarations together in the order of the list of
5910 names. Store that chain in the function decl, replacing the
5913 DECL_ARGUMENTS (fndecl) = 0;
5916 for (last = 0; parm; parm = TREE_CHAIN (parm))
5917 if (TREE_PURPOSE (parm))
5920 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
5922 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5923 last = TREE_PURPOSE (parm);
5924 TREE_CHAIN (last) = 0;
5928 /* If there was a previous prototype,
5929 set the DECL_ARG_TYPE of each argument according to
5930 the type previously specified, and report any mismatches. */
5932 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5935 for (parm = DECL_ARGUMENTS (fndecl),
5936 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5937 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5938 != void_type_node));
5939 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5941 if (parm == 0 || type == 0
5942 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5944 error ("number of arguments doesn't match prototype");
5945 error_with_file_and_line (current_function_prototype_file,
5946 current_function_prototype_line,
5947 "prototype declaration");
5950 /* Type for passing arg must be consistent with that
5951 declared for the arg. ISO C says we take the unqualified
5952 type for parameters declared with qualified type. */
5953 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5954 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
5956 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5957 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5959 /* Adjust argument to match prototype. E.g. a previous
5960 `int foo(float);' prototype causes
5961 `int foo(x) float x; {...}' to be treated like
5962 `int foo(float x) {...}'. This is particularly
5963 useful for argument types like uid_t. */
5964 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5966 if (PROMOTE_PROTOTYPES
5967 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5968 && TYPE_PRECISION (TREE_TYPE (parm))
5969 < TYPE_PRECISION (integer_type_node))
5970 DECL_ARG_TYPE (parm) = integer_type_node;
5974 pedwarn ("promoted argument `%s' doesn't match prototype",
5975 IDENTIFIER_POINTER (DECL_NAME (parm)));
5976 warning_with_file_and_line
5977 (current_function_prototype_file,
5978 current_function_prototype_line,
5979 "prototype declaration");
5984 error ("argument `%s' doesn't match prototype",
5985 IDENTIFIER_POINTER (DECL_NAME (parm)));
5986 error_with_file_and_line (current_function_prototype_file,
5987 current_function_prototype_line,
5988 "prototype declaration");
5992 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5995 /* Otherwise, create a prototype that would match. */
5999 tree actual = 0, last = 0, type;
6001 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6003 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6005 TREE_CHAIN (last) = type;
6010 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6012 TREE_CHAIN (last) = type;
6016 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6017 of the type of this function, but we need to avoid having this
6018 affect the types of other similarly-typed functions, so we must
6019 first force the generation of an identical (but separate) type
6020 node for the relevant function type. The new node we create
6021 will be a variant of the main variant of the original function
6024 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6026 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6029 /* Now store the final chain of decls for the arguments
6030 as the decl-chain of the current lexical scope.
6031 Put the enumerators in as well, at the front so that
6032 DECL_ARGUMENTS is not modified. */
6034 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6037 /* Make sure the binding level for the top of the function body
6038 gets a BLOCK if there are any in the function.
6039 Otherwise, the dbx output is wrong. */
6041 keep_next_if_subblocks = 1;
6043 /* ??? This might be an improvement,
6044 but needs to be thought about some more. */
6046 keep_next_level_flag = 1;
6049 /* Write a record describing this function definition to the prototypes
6050 file (if requested). */
6052 gen_aux_info_record (fndecl, 1, 0, prototype);
6054 /* Initialize the RTL code for the function. */
6055 init_function_start (fndecl, input_filename, lineno);
6057 /* Begin the statement tree for this function. */
6058 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6060 /* If this is a nested function, save away the sizes of any
6061 variable-size types so that we can expand them when generating
6067 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6068 = nreverse (get_pending_sizes ());
6069 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6072 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6075 /* This function is being processed in whole-function mode. */
6076 cfun->x_whole_function_mode_p = 1;
6078 /* Even though we're inside a function body, we still don't want to
6079 call expand_expr to calculate the size of a variable-sized array.
6080 We haven't necessarily assigned RTL to all variables yet, so it's
6081 not safe to try to expand expressions involving them. */
6082 immediate_size_expand = 0;
6083 cfun->x_dont_save_pending_sizes_p = 1;
6085 warn_shadow = saved_warn_shadow;
6088 /* Finish up a function declaration and compile that function
6089 all the way to assembler language output. The free the storage
6090 for the function definition.
6092 This is called after parsing the body of the function definition.
6094 NESTED is nonzero if the function being finished is nested in another.
6095 CAN_DEFER_P is nonzero if the function may be deferred. */
6098 finish_function (nested, can_defer_p)
6102 tree fndecl = current_function_decl;
6104 /* When a function declaration is totally empty, e.g.
6106 (the argument list is irrelevant) the compstmt rule will not
6107 bother calling pushlevel/poplevel, which means we get here with
6108 the binding_level stack out of sync. Detect this situation by
6109 noticing that the current_binding_level is still as
6110 store_parm_decls left it, and do a dummy push/pop to get back to
6111 consistency. Note that the call to pushlevel does not actually
6112 push another binding level - see there for details. */
6113 if (current_binding_level->parm_flag && keep_next_if_subblocks)
6120 /* This caused &foo to be of type ptr-to-const-function which then
6121 got a warning when stored in a ptr-to-function variable. */
6122 TREE_READONLY (fndecl) = 1;
6125 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6127 /* Must mark the RESULT_DECL as being in this function. */
6129 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6131 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6133 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6134 != integer_type_node)
6136 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6137 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6139 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6143 #ifdef DEFAULT_MAIN_RETURN
6144 /* Make it so that `main' always returns success by default. */
6145 DEFAULT_MAIN_RETURN;
6148 c_expand_return (integer_zero_node);
6153 finish_fname_decls ();
6155 /* Tie off the statement tree for this function. */
6156 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6158 /* Complain if there's just no return statement. */
6159 if (warn_return_type
6160 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6161 && !current_function_returns_value && !current_function_returns_null
6162 /* Don't complain if we abort. */
6163 && !current_function_returns_abnormally
6164 /* Don't warn for main(). */
6165 && !MAIN_NAME_P (DECL_NAME (fndecl))
6166 /* Or if they didn't actually specify a return type. */
6167 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6168 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6169 inline function, as we might never be compiled separately. */
6170 && DECL_INLINE (fndecl))
6171 warning ("no return statement in function returning non-void");
6173 /* Clear out memory we no longer need. */
6174 free_after_parsing (cfun);
6175 /* Since we never call rest_of_compilation, we never clear
6176 CFUN. Do so explicitly. */
6177 free_after_compilation (cfun);
6180 if (flag_unit_at_a_time && can_defer_p)
6182 cgraph_finalize_function (fndecl, DECL_SAVED_TREE (fndecl));
6183 current_function_decl = NULL;
6189 /* Function is parsed.
6190 Generate RTL for the body of this function or defer
6191 it for later expansion. */
6192 int uninlinable = 1;
6194 /* There's no reason to do any of the work here if we're only doing
6195 semantic analysis; this code just generates RTL. */
6196 if (flag_syntax_only)
6198 current_function_decl = NULL;
6199 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6203 if (flag_inline_trees)
6205 /* First, cache whether the current function is inlinable. Some
6206 predicates depend on cfun and current_function_decl to
6207 function completely. */
6208 timevar_push (TV_INTEGRATION);
6209 uninlinable = ! tree_inlinable_function_p (fndecl, 0);
6212 /* We defer functions marked inline *even if* the function
6213 itself is not inlinable. This is because we don't yet
6214 know if the function will actually be used; we may be
6215 able to avoid emitting it entirely. */
6216 && (! uninlinable || DECL_DECLARED_INLINE_P (fndecl))
6217 /* Save function tree for inlining. Should return 0 if the
6218 language does not support function deferring or the
6219 function could not be deferred. */
6220 && defer_fn (fndecl))
6222 /* Let the back-end know that this function exists. */
6223 (*debug_hooks->deferred_inline_function) (fndecl);
6224 timevar_pop (TV_INTEGRATION);
6225 current_function_decl = NULL;
6229 /* Then, inline any functions called in it. */
6230 optimize_inline_calls (fndecl);
6231 timevar_pop (TV_INTEGRATION);
6234 c_expand_body (fndecl);
6238 /* Allow the body of the function to be garbage collected. */
6239 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6242 /* Let the error reporting routines know that we're outside a
6243 function. For a nested function, this value is used in
6244 c_pop_function_context and then reset via pop_function_context. */
6245 current_function_decl = NULL;
6249 /* Generate the RTL for a deferred function FNDECL. */
6252 c_expand_deferred_function (fndecl)
6255 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6256 function was deferred, e.g. in duplicate_decls. */
6257 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6259 if (flag_inline_trees)
6261 timevar_push (TV_INTEGRATION);
6262 optimize_inline_calls (fndecl);
6263 timevar_pop (TV_INTEGRATION);
6265 c_expand_body (fndecl);
6266 current_function_decl = NULL;
6270 /* Called to move the SAVE_EXPRs for parameter declarations in a
6271 nested function into the nested function. DATA is really the
6272 nested FUNCTION_DECL. */
6275 set_save_expr_context (tree *tp,
6279 if (TREE_CODE (*tp) == SAVE_EXPR && !SAVE_EXPR_CONTEXT (*tp))
6280 SAVE_EXPR_CONTEXT (*tp) = (tree) data;
6281 /* Do not walk back into the SAVE_EXPR_CONTEXT; that will cause
6283 else if (DECL_P (*tp))
6289 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6290 then we are already in the process of generating RTL for another
6291 function. If can_defer_p is zero, we won't attempt to defer the
6292 generation of RTL. */
6295 c_expand_body_1 (fndecl, nested_p)
6299 timevar_push (TV_EXPAND);
6303 /* Make sure that we will evaluate variable-sized types involved
6304 in our function's type. */
6305 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6306 /* Squirrel away our current state. */
6307 push_function_context ();
6310 /* Initialize the RTL code for the function. */
6311 current_function_decl = fndecl;
6312 input_filename = DECL_SOURCE_FILE (fndecl);
6313 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6314 lineno = DECL_SOURCE_LINE (fndecl);
6316 /* This function is being processed in whole-function mode. */
6317 cfun->x_whole_function_mode_p = 1;
6319 /* Even though we're inside a function body, we still don't want to
6320 call expand_expr to calculate the size of a variable-sized array.
6321 We haven't necessarily assigned RTL to all variables yet, so it's
6322 not safe to try to expand expressions involving them. */
6323 immediate_size_expand = 0;
6324 cfun->x_dont_save_pending_sizes_p = 1;
6326 /* Set up parameters and prepare for return, for the function. */
6327 expand_function_start (fndecl, 0);
6329 /* If the function has a variably modified type, there may be
6330 SAVE_EXPRs in the parameter types. Their context must be set to
6331 refer to this function; they cannot be expanded in the containing
6333 if (decl_function_context (fndecl)
6334 && variably_modified_type_p (TREE_TYPE (fndecl)))
6335 walk_tree (&TREE_TYPE (fndecl), set_save_expr_context, fndecl,
6338 /* If this function is `main', emit a call to `__main'
6339 to run global initializers, etc. */
6340 if (DECL_NAME (fndecl)
6341 && MAIN_NAME_P (DECL_NAME (fndecl))
6342 && DECL_CONTEXT (fndecl) == NULL_TREE)
6343 expand_main_function ();
6345 /* Generate the RTL for this function. */
6346 expand_stmt (DECL_SAVED_TREE (fndecl));
6348 /* We hard-wired immediate_size_expand to zero above.
6349 expand_function_end will decrement this variable. So, we set the
6350 variable to one here, so that after the decrement it will remain
6352 immediate_size_expand = 1;
6354 /* Allow language dialects to perform special processing. */
6355 if (lang_expand_function_end)
6356 (*lang_expand_function_end) ();
6358 /* Generate rtl for function exit. */
6359 expand_function_end (input_filename, lineno, 0);
6361 /* If this is a nested function, protect the local variables in the stack
6362 above us from being collected while we're compiling this function. */
6364 ggc_push_context ();
6366 /* Run the optimizers and output the assembler code for this function. */
6367 rest_of_compilation (fndecl);
6369 /* Undo the GC context switch. */
6373 /* With just -Wextra, complain only if function returns both with
6374 and without a value. */
6376 && current_function_returns_value
6377 && current_function_returns_null)
6378 warning ("this function may return with or without a value");
6380 /* If requested, warn about function definitions where the function will
6381 return a value (usually of some struct or union type) which itself will
6382 take up a lot of stack space. */
6384 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6386 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6388 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6389 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6390 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6393 unsigned int size_as_int
6394 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6396 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6397 warning_with_decl (fndecl,
6398 "size of return value of `%s' is %u bytes",
6401 warning_with_decl (fndecl,
6402 "size of return value of `%s' is larger than %d bytes",
6407 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6408 && ! flag_inline_trees)
6410 /* Stop pointing to the local nodes about to be freed.
6411 But DECL_INITIAL must remain nonzero so we know this
6412 was an actual function definition.
6413 For a nested function, this is done in c_pop_function_context.
6414 If rest_of_compilation set this to 0, leave it 0. */
6415 if (DECL_INITIAL (fndecl) != 0)
6416 DECL_INITIAL (fndecl) = error_mark_node;
6418 DECL_ARGUMENTS (fndecl) = 0;
6421 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6423 if (targetm.have_ctors_dtors)
6424 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6425 DEFAULT_INIT_PRIORITY);
6427 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6430 if (DECL_STATIC_DESTRUCTOR (fndecl))
6432 if (targetm.have_ctors_dtors)
6433 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6434 DEFAULT_INIT_PRIORITY);
6436 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6440 /* Return to the enclosing function. */
6441 pop_function_context ();
6442 timevar_pop (TV_EXPAND);
6445 /* Like c_expand_body_1 but only for unnested functions. */
6448 c_expand_body (fndecl)
6451 c_expand_body_1 (fndecl, 0);
6454 /* Check the declarations given in a for-loop for satisfying the C99
6457 check_for_loop_decls ()
6463 /* If we get here, declarations have been used in a for loop without
6464 the C99 for loop scope. This doesn't make much sense, so don't
6466 error ("`for' loop initial declaration used outside C99 mode");
6469 /* C99 subclause 6.8.5 paragraph 3:
6471 [#3] The declaration part of a for statement shall only
6472 declare identifiers for objects having storage class auto or
6475 It isn't clear whether, in this sentence, "identifiers" binds to
6476 "shall only declare" or to "objects" - that is, whether all identifiers
6477 declared must be identifiers for objects, or whether the restriction
6478 only applies to those that are. (A question on this in comp.std.c
6479 in November 2000 received no answer.) We implement the strictest
6480 interpretation, to avoid creating an extension which later causes
6483 for (t = gettags (); t; t = TREE_CHAIN (t))
6485 if (TREE_PURPOSE (t) != 0)
6487 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6489 if (code == RECORD_TYPE)
6490 error ("`struct %s' declared in `for' loop initial declaration",
6491 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6492 else if (code == UNION_TYPE)
6493 error ("`union %s' declared in `for' loop initial declaration",
6494 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6496 error ("`enum %s' declared in `for' loop initial declaration",
6497 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6501 for (t = getdecls (); t; t = TREE_CHAIN (t))
6503 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6504 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6505 else if (TREE_STATIC (t))
6506 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6507 else if (DECL_EXTERNAL (t))
6508 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6512 /* Save and restore the variables in this file and elsewhere
6513 that keep track of the progress of compilation of the current function.
6514 Used for nested functions. */
6516 struct language_function GTY(())
6518 struct c_language_function base;
6520 tree shadowed_labels;
6523 int returns_abnormally;
6524 int warn_about_return_type;
6526 struct binding_level *binding_level;
6529 /* Save and reinitialize the variables
6530 used during compilation of a C function. */
6533 c_push_function_context (f)
6536 struct language_function *p;
6537 p = ((struct language_function *)
6538 ggc_alloc (sizeof (struct language_function)));
6541 p->base.x_stmt_tree = c_stmt_tree;
6542 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6543 p->named_labels = named_labels;
6544 p->shadowed_labels = shadowed_labels;
6545 p->returns_value = current_function_returns_value;
6546 p->returns_null = current_function_returns_null;
6547 p->returns_abnormally = current_function_returns_abnormally;
6548 p->warn_about_return_type = warn_about_return_type;
6549 p->extern_inline = current_extern_inline;
6550 p->binding_level = current_binding_level;
6553 /* Restore the variables used during compilation of a C function. */
6556 c_pop_function_context (f)
6559 struct language_function *p = f->language;
6562 /* Bring back all the labels that were shadowed. */
6563 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6564 if (DECL_NAME (TREE_VALUE (link)) != 0)
6565 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6566 = TREE_VALUE (link);
6568 if (DECL_SAVED_INSNS (current_function_decl) == 0
6569 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6571 /* Stop pointing to the local nodes about to be freed. */
6572 /* But DECL_INITIAL must remain nonzero so we know this
6573 was an actual function definition. */
6574 DECL_INITIAL (current_function_decl) = error_mark_node;
6575 DECL_ARGUMENTS (current_function_decl) = 0;
6578 c_stmt_tree = p->base.x_stmt_tree;
6579 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6580 named_labels = p->named_labels;
6581 shadowed_labels = p->shadowed_labels;
6582 current_function_returns_value = p->returns_value;
6583 current_function_returns_null = p->returns_null;
6584 current_function_returns_abnormally = p->returns_abnormally;
6585 warn_about_return_type = p->warn_about_return_type;
6586 current_extern_inline = p->extern_inline;
6587 current_binding_level = p->binding_level;
6592 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6595 c_dup_lang_specific_decl (decl)
6598 struct lang_decl *ld;
6600 if (!DECL_LANG_SPECIFIC (decl))
6603 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
6604 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
6605 sizeof (struct lang_decl));
6606 DECL_LANG_SPECIFIC (decl) = ld;
6609 /* The functions below are required for functionality of doing
6610 function at once processing in the C front end. Currently these
6611 functions are not called from anywhere in the C front end, but as
6612 these changes continue, that will change. */
6614 /* Returns nonzero if the current statement is a full expression,
6615 i.e. temporaries created during that statement should be destroyed
6616 at the end of the statement. */
6619 stmts_are_full_exprs_p ()
6624 /* Returns the stmt_tree (if any) to which statements are currently
6625 being added. If there is no active statement-tree, NULL is
6629 current_stmt_tree ()
6631 return &c_stmt_tree;
6634 /* Returns the stack of SCOPE_STMTs for the current function. */
6637 current_scope_stmt_stack ()
6639 return &c_scope_stmt_stack;
6642 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6646 anon_aggr_type_p (node)
6647 tree node ATTRIBUTE_UNUSED;
6652 /* Dummy function in place of callback used by C++. */
6655 extract_interface_info ()
6659 /* Return a new COMPOUND_STMT, after adding it to the current
6663 c_begin_compound_stmt ()
6667 /* Create the COMPOUND_STMT. */
6668 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6673 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6677 c_expand_decl_stmt (t)
6680 tree decl = DECL_STMT_DECL (t);
6682 /* Expand nested functions. */
6683 if (TREE_CODE (decl) == FUNCTION_DECL
6684 && DECL_CONTEXT (decl) == current_function_decl
6685 && DECL_SAVED_TREE (decl))
6686 c_expand_body_1 (decl, 1);
6689 /* Return the global value of T as a symbol. */
6692 identifier_global_value (t)
6695 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6696 if (decl == 0 || DECL_CONTEXT (decl) == 0)
6699 /* Shadowed by something else; find the true global value. */
6700 for (decl = global_binding_level->names; decl; decl = TREE_CHAIN (decl))
6701 if (DECL_NAME (decl) == t)
6704 /* Only local values for this decl. */
6708 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6709 otherwise the name is found in ridpointers from RID_INDEX. */
6712 record_builtin_type (rid_index, name, type)
6719 id = ridpointers[(int) rid_index];
6721 id = get_identifier (name);
6722 pushdecl (build_decl (TYPE_DECL, id, type));
6725 /* Build the void_list_node (void_type_node having been created). */
6727 build_void_list_node ()
6729 tree t = build_tree_list (NULL_TREE, void_type_node);
6733 /* Return something to represent absolute declarators containing a *.
6734 TARGET is the absolute declarator that the * contains.
6735 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6736 to apply to the pointer type, represented as identifiers, possible mixed
6739 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6740 if attributes are present) and whose type is the modifier list. */
6743 make_pointer_declarator (type_quals_attrs, target)
6744 tree type_quals_attrs, target;
6747 tree itarget = target;
6748 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6749 if (attrs != NULL_TREE)
6750 itarget = tree_cons (attrs, target, NULL_TREE);
6751 return build1 (INDIRECT_REF, quals, itarget);
6754 #include "gt-c-decl.h"