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, input_line,
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, input_line,
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))
865 /* If you declare a built-in or predefined function name as static,
866 the old definition is overridden,
867 but optionally warn this was a bad choice of name. */
868 if (!TREE_PUBLIC (newdecl))
871 warning_with_decl (newdecl, "shadowing built-in function `%s'");
874 warning_with_decl (newdecl,
875 "built-in function `%s' declared as non-function");
879 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
880 error_with_decl (olddecl, "previous declaration of `%s'");
886 /* For real parm decl following a forward decl, return 1 so old decl
887 will be reused. Only allow this to happen once. */
888 if (types_match && TREE_CODE (newdecl) == PARM_DECL
889 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
891 TREE_ASM_WRITTEN (olddecl) = 0;
895 /* The new declaration is the same kind of object as the old one.
896 The declarations may partially match. Print warnings if they don't
897 match enough. Ultimately, copy most of the information from the new
898 decl to the old one, and keep using the old one. */
900 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
902 /* A function declaration for a built-in function. */
903 if (!TREE_PUBLIC (newdecl))
905 /* If you declare a built-in function name as static, the
906 built-in definition is overridden,
907 but optionally warn this was a bad choice of name. */
909 warning_with_decl (newdecl, "shadowing built-in function `%s'");
910 /* Discard the old built-in function. */
913 else if (!types_match)
915 /* Accept the return type of the new declaration if same modes. */
916 tree oldreturntype = TREE_TYPE (oldtype);
917 tree newreturntype = TREE_TYPE (newtype);
919 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
921 /* Function types may be shared, so we can't just modify
922 the return type of olddecl's function type. */
924 = build_function_type (newreturntype,
925 TYPE_ARG_TYPES (oldtype));
926 trytype = build_type_attribute_variant (trytype,
927 TYPE_ATTRIBUTES (oldtype));
929 types_match = comptypes (newtype, trytype);
933 /* Accept harmless mismatch in first argument type also.
934 This is for the ffs and fprintf builtins. */
935 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
936 && TYPE_ARG_TYPES (oldtype) != 0
937 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
938 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
939 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
940 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
942 /* Function types may be shared, so we can't just modify
943 the return type of olddecl's function type. */
945 = build_function_type (TREE_TYPE (oldtype),
946 tree_cons (NULL_TREE,
947 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
948 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
949 trytype = build_type_attribute_variant (trytype,
950 TYPE_ATTRIBUTES (oldtype));
952 types_match = comptypes (newtype, trytype);
956 if (! different_binding_level)
957 TREE_TYPE (olddecl) = oldtype;
959 else if (TYPE_ARG_TYPES (oldtype) == NULL
960 && TYPE_ARG_TYPES (newtype) != NULL)
962 /* For bcmp, bzero, fputs the builtin type has arguments not
963 specified. Use the ones from the prototype so that type checking
966 = build_function_type (TREE_TYPE (oldtype),
967 TYPE_ARG_TYPES (newtype));
968 trytype = build_type_attribute_variant (trytype,
969 TYPE_ATTRIBUTES (oldtype));
972 if (! different_binding_level)
973 TREE_TYPE (olddecl) = oldtype;
977 /* If types don't match for a built-in, throw away the built-in. */
978 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
982 else if (TREE_CODE (olddecl) == FUNCTION_DECL
983 && DECL_SOURCE_LINE (olddecl) == 0)
985 /* A function declaration for a predeclared function
986 that isn't actually built in. */
987 if (!TREE_PUBLIC (newdecl))
989 /* If you declare it as static, the
990 default definition is overridden. */
993 else if (!types_match)
995 /* If the types don't match, preserve volatility indication.
996 Later on, we will discard everything else about the
997 default declaration. */
998 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1001 /* Permit char *foo () to match void *foo (...) if not pedantic,
1002 if one of them came from a system header file. */
1003 else if (!types_match
1004 && TREE_CODE (olddecl) == FUNCTION_DECL
1005 && TREE_CODE (newdecl) == FUNCTION_DECL
1006 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1007 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1008 && (DECL_IN_SYSTEM_HEADER (olddecl)
1009 || DECL_IN_SYSTEM_HEADER (newdecl))
1010 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1011 && TYPE_ARG_TYPES (oldtype) == 0
1012 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1013 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1015 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1016 && TYPE_ARG_TYPES (newtype) == 0
1017 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1018 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1021 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1022 /* Make sure we keep void * as ret type, not char *. */
1023 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1024 TREE_TYPE (newdecl) = newtype = oldtype;
1026 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1027 we will come back here again. */
1028 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1030 /* Permit void foo (...) to match int foo (...) if the latter is the
1031 definition and implicit int was used. See c-torture/compile/920625-2.c. */
1032 else if (!types_match && new_is_definition
1033 && TREE_CODE (olddecl) == FUNCTION_DECL
1034 && TREE_CODE (newdecl) == FUNCTION_DECL
1035 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1036 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1037 && C_FUNCTION_IMPLICIT_INT (newdecl))
1039 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1040 /* Make sure we keep void as the return type. */
1041 TREE_TYPE (newdecl) = newtype = oldtype;
1042 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1044 else if (!types_match
1045 /* Permit char *foo (int, ...); followed by char *foo ();
1047 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1049 /* Return types must still match. */
1050 && comptypes (TREE_TYPE (oldtype),
1051 TREE_TYPE (newtype))
1052 && TYPE_ARG_TYPES (newtype) == 0))
1054 error_with_decl (newdecl, "conflicting types for `%s'");
1055 /* Check for function type mismatch
1056 involving an empty arglist vs a nonempty one. */
1057 if (TREE_CODE (olddecl) == FUNCTION_DECL
1058 && comptypes (TREE_TYPE (oldtype),
1059 TREE_TYPE (newtype))
1060 && ((TYPE_ARG_TYPES (oldtype) == 0
1061 && DECL_INITIAL (olddecl) == 0)
1063 (TYPE_ARG_TYPES (newtype) == 0
1064 && DECL_INITIAL (newdecl) == 0)))
1066 /* Classify the problem further. */
1067 tree t = TYPE_ARG_TYPES (oldtype);
1069 t = TYPE_ARG_TYPES (newtype);
1070 for (; t; t = TREE_CHAIN (t))
1072 tree type = TREE_VALUE (t);
1074 if (TREE_CHAIN (t) == 0
1075 && TYPE_MAIN_VARIANT (type) != void_type_node)
1077 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1081 if (c_type_promotes_to (type) != type)
1083 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1088 if (C_DECL_IMPLICIT (olddecl))
1089 error_with_decl (olddecl, "previous implicit declaration of `%s'");
1091 error_with_decl (olddecl, "previous declaration of `%s'");
1093 /* This is safer because the initializer might contain references
1094 to variables that were declared between olddecl and newdecl. This
1095 will make the initializer invalid for olddecl in case it gets
1096 assigned to olddecl below. */
1097 if (TREE_CODE (newdecl) == VAR_DECL)
1098 DECL_INITIAL (newdecl) = 0;
1100 /* TLS cannot follow non-TLS declaration. */
1101 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1102 && !DECL_THREAD_LOCAL (olddecl) && DECL_THREAD_LOCAL (newdecl))
1104 error_with_decl (newdecl, "thread-local declaration of `%s' follows non thread-local declaration");
1105 error_with_decl (olddecl, "previous declaration of `%s'");
1107 /* non-TLS declaration cannot follow TLS declaration. */
1108 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1109 && DECL_THREAD_LOCAL (olddecl) && !DECL_THREAD_LOCAL (newdecl))
1111 error_with_decl (newdecl, "non thread-local declaration of `%s' follows thread-local declaration");
1112 error_with_decl (olddecl, "previous declaration of `%s'");
1116 errmsg = redeclaration_error_message (newdecl, olddecl);
1122 error_with_decl (newdecl, "redefinition of `%s'");
1125 error_with_decl (newdecl, "redeclaration of `%s'");
1128 error_with_decl (newdecl, "conflicting declarations of `%s'");
1134 error_with_decl (olddecl,
1135 ((DECL_INITIAL (olddecl)
1136 && current_binding_level == global_binding_level)
1137 ? "`%s' previously defined here"
1138 : "`%s' previously declared here"));
1141 else if (TREE_CODE (newdecl) == TYPE_DECL
1142 && (DECL_IN_SYSTEM_HEADER (olddecl)
1143 || DECL_IN_SYSTEM_HEADER (newdecl)))
1145 warning_with_decl (newdecl, "redefinition of `%s'");
1148 ((DECL_INITIAL (olddecl)
1149 && current_binding_level == global_binding_level)
1150 ? "`%s' previously defined here"
1151 : "`%s' previously declared here"));
1153 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1154 && DECL_INITIAL (olddecl) != 0
1155 && TYPE_ARG_TYPES (oldtype) == 0
1156 && TYPE_ARG_TYPES (newtype) != 0
1157 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1161 /* Prototype decl follows defn w/o prototype. */
1163 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1164 type = TYPE_ARG_TYPES (newtype),
1167 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1169 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1170 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1172 warning_with_decl (newdecl, "prototype for `%s' follows");
1173 warning_with_decl (olddecl, "non-prototype definition here");
1176 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1177 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1179 error_with_decl (newdecl,
1180 "prototype for `%s' follows and number of arguments doesn't match");
1181 error_with_decl (olddecl, "non-prototype definition here");
1185 /* Type for passing arg must be consistent
1186 with that declared for the arg. */
1187 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)))
1189 error_with_decl (newdecl,
1190 "prototype for `%s' follows and argument %d doesn't match",
1192 error_with_decl (olddecl, "non-prototype definition here");
1198 /* Warn about mismatches in various flags. */
1201 /* Warn if function is now inline
1202 but was previously declared not inline and has been called. */
1203 if (TREE_CODE (olddecl) == FUNCTION_DECL
1204 && ! DECL_DECLARED_INLINE_P (olddecl)
1205 && DECL_DECLARED_INLINE_P (newdecl)
1206 && TREE_USED (olddecl))
1207 warning_with_decl (newdecl,
1208 "`%s' declared inline after being called");
1209 if (TREE_CODE (olddecl) == FUNCTION_DECL
1210 && ! DECL_DECLARED_INLINE_P (olddecl)
1211 && DECL_DECLARED_INLINE_P (newdecl)
1212 && DECL_INITIAL (olddecl) != 0)
1213 warning_with_decl (newdecl,
1214 "`%s' declared inline after its definition");
1216 /* If pedantic, warn when static declaration follows a non-static
1217 declaration. Otherwise, do so only for functions. */
1218 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1219 && TREE_PUBLIC (olddecl)
1220 && !TREE_PUBLIC (newdecl))
1221 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1223 /* If warn_traditional, warn when a non-static function
1224 declaration follows a static one. */
1225 if (warn_traditional && !in_system_header
1226 && TREE_CODE (olddecl) == FUNCTION_DECL
1227 && !TREE_PUBLIC (olddecl)
1228 && TREE_PUBLIC (newdecl))
1229 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1231 /* Warn when const declaration follows a non-const
1232 declaration, but not for functions. */
1233 if (TREE_CODE (olddecl) != FUNCTION_DECL
1234 && !TREE_READONLY (olddecl)
1235 && TREE_READONLY (newdecl))
1236 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1237 /* These bits are logically part of the type, for variables.
1238 But not for functions
1239 (where qualifiers are not valid ANSI anyway). */
1240 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1241 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1242 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1243 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1247 /* Optionally warn about more than one declaration for the same name. */
1248 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1249 /* Don't warn about a function declaration
1250 followed by a definition. */
1251 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1252 && DECL_INITIAL (olddecl) == 0)
1253 /* Don't warn about extern decl followed by (tentative) definition. */
1254 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1256 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1257 warning_with_decl (olddecl, "previous declaration of `%s'");
1260 /* Copy all the DECL_... slots specified in the new decl
1261 except for any that we copy here from the old type.
1263 Past this point, we don't change OLDTYPE and NEWTYPE
1264 even if we change the types of NEWDECL and OLDDECL. */
1268 /* When copying info to olddecl, we store into write_olddecl
1269 instead. This allows us to avoid modifying olddecl when
1270 different_binding_level is true. */
1271 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1273 /* Merge the data types specified in the two decls. */
1274 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1276 if (different_binding_level)
1278 if (TYPE_ARG_TYPES (oldtype) != 0
1279 && TYPE_ARG_TYPES (newtype) == 0)
1280 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1283 = build_type_attribute_variant
1285 merge_attributes (TYPE_ATTRIBUTES (newtype),
1286 TYPE_ATTRIBUTES (oldtype)));
1290 = TREE_TYPE (olddecl)
1291 = common_type (newtype, oldtype);
1294 /* Lay the type out, unless already done. */
1295 if (oldtype != TREE_TYPE (newdecl))
1297 if (TREE_TYPE (newdecl) != error_mark_node)
1298 layout_type (TREE_TYPE (newdecl));
1299 if (TREE_CODE (newdecl) != FUNCTION_DECL
1300 && TREE_CODE (newdecl) != TYPE_DECL
1301 && TREE_CODE (newdecl) != CONST_DECL)
1302 layout_decl (newdecl, 0);
1306 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1307 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1308 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1309 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1310 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1311 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1313 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1314 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1318 /* Keep the old rtl since we can safely use it. */
1319 COPY_DECL_RTL (olddecl, newdecl);
1321 /* Merge the type qualifiers. */
1322 if (TREE_READONLY (newdecl))
1323 TREE_READONLY (write_olddecl) = 1;
1325 if (TREE_THIS_VOLATILE (newdecl))
1327 TREE_THIS_VOLATILE (write_olddecl) = 1;
1328 if (TREE_CODE (newdecl) == VAR_DECL
1329 /* If an automatic variable is re-declared in the same
1330 function scope, but the old declaration was not
1331 volatile, make_var_volatile() would crash because the
1332 variable would have been assigned to a pseudo, not a
1333 MEM. Since this duplicate declaration is invalid
1334 anyway, we just skip the call. */
1336 make_var_volatile (newdecl);
1339 /* Keep source location of definition rather than declaration. */
1340 /* When called with different_binding_level set, keep the old
1341 information so that meaningful diagnostics can be given. */
1342 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1343 && ! different_binding_level)
1345 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1346 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1349 /* Merge the unused-warning information. */
1350 if (DECL_IN_SYSTEM_HEADER (olddecl))
1351 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1352 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1353 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1355 /* Merge the initialization information. */
1356 /* When called with different_binding_level set, don't copy over
1357 DECL_INITIAL, so that we don't accidentally change function
1358 declarations into function definitions. */
1359 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1360 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1362 /* Merge the section attribute.
1363 We want to issue an error if the sections conflict but that must be
1364 done later in decl_attributes since we are called before attributes
1366 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1367 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1369 /* Copy the assembler name.
1370 Currently, it can only be defined in the prototype. */
1371 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1373 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1375 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1376 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1377 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1378 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1379 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1380 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1381 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1382 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1383 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1386 /* If cannot merge, then use the new type and qualifiers,
1387 and don't preserve the old rtl. */
1388 else if (! different_binding_level)
1390 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1391 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1392 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1393 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1396 /* Merge the storage class information. */
1397 merge_weak (newdecl, olddecl);
1399 /* For functions, static overrides non-static. */
1400 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1402 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1403 /* This is since we don't automatically
1404 copy the attributes of NEWDECL into OLDDECL. */
1405 /* No need to worry about different_binding_level here because
1406 then TREE_PUBLIC (newdecl) was true. */
1407 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1408 /* If this clears `static', clear it in the identifier too. */
1409 if (! TREE_PUBLIC (olddecl))
1410 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1412 if (DECL_EXTERNAL (newdecl))
1414 if (! different_binding_level)
1416 /* Don't mess with these flags on local externs; they remain
1417 external even if there's a declaration at file scope which
1419 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1420 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1422 /* An extern decl does not override previous storage class. */
1423 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1424 if (! DECL_EXTERNAL (newdecl))
1425 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1429 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1430 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1433 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1435 /* If we're redefining a function previously defined as extern
1436 inline, make sure we emit debug info for the inline before we
1437 throw it away, in case it was inlined into a function that hasn't
1438 been written out yet. */
1439 if (new_is_definition && DECL_INITIAL (olddecl))
1441 if (TREE_USED (olddecl))
1442 (*debug_hooks->outlining_inline_function) (olddecl);
1444 /* The new defn must not be inline. */
1445 DECL_INLINE (newdecl) = 0;
1446 DECL_UNINLINABLE (newdecl) = 1;
1450 /* If either decl says `inline', this fn is inline,
1451 unless its definition was passed already. */
1452 if (DECL_DECLARED_INLINE_P (newdecl)
1453 || DECL_DECLARED_INLINE_P (olddecl))
1454 DECL_DECLARED_INLINE_P (newdecl) = 1;
1456 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1457 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1460 if (DECL_BUILT_IN (olddecl))
1462 /* Get rid of any built-in function if new arg types don't match it
1463 or if we have a function definition. */
1464 if (! types_match || new_is_definition)
1466 if (! different_binding_level)
1468 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1469 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1474 /* If redeclaring a builtin function, and not a definition,
1475 it stays built in. */
1476 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1477 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1481 /* Also preserve various other info from the definition. */
1482 if (! new_is_definition)
1484 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1485 /* When called with different_binding_level set, don't copy over
1486 DECL_INITIAL, so that we don't accidentally change function
1487 declarations into function definitions. */
1488 if (! different_binding_level)
1489 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1490 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1491 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1492 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
1493 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1495 /* Set DECL_INLINE on the declaration if we've got a body
1496 from which to instantiate. */
1497 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1499 DECL_INLINE (newdecl) = 1;
1500 DECL_ABSTRACT_ORIGIN (newdecl)
1501 = (different_binding_level
1502 ? DECL_ORIGIN (olddecl)
1503 : DECL_ABSTRACT_ORIGIN (olddecl));
1508 /* If a previous declaration said inline, mark the
1509 definition as inlinable. */
1510 if (DECL_DECLARED_INLINE_P (newdecl)
1511 && ! DECL_UNINLINABLE (newdecl))
1512 DECL_INLINE (newdecl) = 1;
1515 if (different_binding_level)
1518 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1519 But preserve OLDDECL's DECL_UID. */
1521 unsigned olddecl_uid = DECL_UID (olddecl);
1523 memcpy ((char *) olddecl + sizeof (struct tree_common),
1524 (char *) newdecl + sizeof (struct tree_common),
1525 sizeof (struct tree_decl) - sizeof (struct tree_common));
1526 DECL_UID (olddecl) = olddecl_uid;
1529 /* NEWDECL contains the merged attribute lists.
1530 Update OLDDECL to be the same. */
1531 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1536 /* Return any external DECL associated with ID, whether or not it is
1537 currently in scope. */
1539 any_external_decl (id)
1542 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1545 if (decl && TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1548 t = purpose_member (id, truly_local_externals);
1550 return TREE_VALUE (t);
1555 /* Record an external decl DECL. This only does something if a
1556 shadowing decl already exists. */
1558 record_external_decl (decl)
1561 tree name = DECL_NAME (decl);
1562 if (!IDENTIFIER_SYMBOL_VALUE (name))
1565 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1568 /* Check whether decl-node X shadows an existing declaration.
1569 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1570 which might be a NULL_TREE. */
1572 warn_if_shadowing (x, old)
1577 /* Nothing to shadow? */
1579 /* Shadow warnings not wanted? */
1581 /* No shadow warnings for internally generated vars. */
1582 || DECL_SOURCE_LINE (x) == 0
1583 /* No shadow warnings for vars made for inlining. */
1584 || DECL_FROM_INLINE (x)
1585 /* Don't warn about the parm names in function declarator
1586 within a function declarator.
1587 It would be nice to avoid warning in any function
1588 declarator in a declaration, as opposed to a definition,
1589 but there is no way to tell it's not a definition. */
1590 || (TREE_CODE (x) == PARM_DECL
1591 && current_binding_level->level_chain->parm_flag))
1594 name = IDENTIFIER_POINTER (DECL_NAME (x));
1596 if (TREE_CODE (old) == PARM_DECL)
1597 shadow_warning (SW_PARAM, name, old);
1598 else if (DECL_CONTEXT (old) == 0)
1599 shadow_warning (SW_GLOBAL, name, old);
1601 shadow_warning (SW_LOCAL, name, old);
1605 /* Subroutine of pushdecl.
1607 X is a TYPE_DECL for a typedef statement. Create a brand new
1608 ..._TYPE node (which will be just a variant of the existing
1609 ..._TYPE node with identical properties) and then install X
1610 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1612 The whole point here is to end up with a situation where each
1613 and every ..._TYPE node the compiler creates will be uniquely
1614 associated with AT MOST one node representing a typedef name.
1615 This way, even though the compiler substitutes corresponding
1616 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1617 early on, later parts of the compiler can always do the reverse
1618 translation and get back the corresponding typedef name. For
1621 typedef struct S MY_TYPE;
1624 Later parts of the compiler might only know that `object' was of
1625 type `struct S' if it were not for code just below. With this
1626 code however, later parts of the compiler see something like:
1628 struct S' == struct S
1629 typedef struct S' MY_TYPE;
1632 And they can then deduce (from the node for type struct S') that
1633 the original object declaration was:
1637 Being able to do this is important for proper support of protoize,
1638 and also for generating precise symbolic debugging information
1639 which takes full account of the programmer's (typedef) vocabulary.
1641 Obviously, we don't want to generate a duplicate ..._TYPE node if
1642 the TYPE_DECL node that we are now processing really represents a
1643 standard built-in type.
1645 Since all standard types are effectively declared at line zero
1646 in the source file, we can easily check to see if we are working
1647 on a standard type by checking the current value of lineno. */
1650 clone_underlying_type (x)
1653 if (DECL_SOURCE_LINE (x) == 0)
1655 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1656 TYPE_NAME (TREE_TYPE (x)) = x;
1658 else if (TREE_TYPE (x) != error_mark_node
1659 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1661 tree tt = TREE_TYPE (x);
1662 DECL_ORIGINAL_TYPE (x) = tt;
1663 tt = build_type_copy (tt);
1665 TREE_USED (tt) = TREE_USED (x);
1670 /* Record a decl-node X as belonging to the current lexical scope.
1671 Check for errors (such as an incompatible declaration for the same
1672 name already seen in the same scope).
1674 Returns either X or an old decl for the same name.
1675 If an old decl is returned, it may have been smashed
1676 to agree with what X says. */
1682 tree name = DECL_NAME (x);
1683 struct binding_level *scope = current_binding_level;
1685 #ifdef ENABLE_CHECKING
1686 if (error_mark_node == 0)
1687 /* Called too early. */
1691 /* Functions need the lang_decl data. */
1692 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1693 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
1694 ggc_alloc_cleared (sizeof (struct lang_decl));
1696 /* A local extern declaration for a function doesn't constitute nesting.
1697 A local auto declaration does, since it's a forward decl
1698 for a nested function coming later. */
1699 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1700 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
1701 DECL_CONTEXT (x) = 0;
1703 DECL_CONTEXT (x) = current_function_decl;
1709 if (warn_nested_externs
1710 && scope != global_binding_level
1711 && DECL_EXTERNAL (x)
1712 && !DECL_IN_SYSTEM_HEADER (x))
1713 warning ("nested extern declaration of `%s'",
1714 IDENTIFIER_POINTER (name));
1716 old = lookup_name_current_level (name);
1717 if (old && duplicate_decls (x, old, 0))
1719 if (DECL_EXTERNAL (x) || scope == global_binding_level)
1721 /* Find and check against a previous, not-in-scope, external
1722 decl for this identifier. (C99 s???: If two declarations
1723 with external linkage, referring to the same object, have
1724 incompatible types, the behavior is undefined). */
1725 tree ext = any_external_decl (name);
1728 if (duplicate_decls (x, ext, scope != global_binding_level))
1729 x = copy_node (ext);
1732 record_external_decl (x);
1735 if (TREE_CODE (x) == TYPE_DECL)
1736 clone_underlying_type (x);
1738 /* If storing a local value, there may already be one
1739 (inherited). If so, record it for restoration when this
1740 binding level ends. Take care not to do this if we are
1741 replacing an older decl in the same binding level (i.e.
1742 duplicate_decls returned false, above). */
1743 if (scope != global_binding_level
1744 && IDENTIFIER_SYMBOL_VALUE (name)
1745 && IDENTIFIER_SYMBOL_VALUE (name) != old)
1747 warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
1748 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1752 /* Install the new declaration in the requested binding level. */
1753 IDENTIFIER_SYMBOL_VALUE (name) = x;
1754 C_DECL_INVISIBLE (x) = 0;
1756 /* Keep list of variables in this level with incomplete type.
1757 If the input is erroneous, we can have error_mark in the type
1758 slot (e.g. "f(void a, ...)") - that doesn't count as an
1760 if (TREE_TYPE (x) != error_mark_node
1761 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1763 tree element = TREE_TYPE (x);
1765 while (TREE_CODE (element) == ARRAY_TYPE)
1766 element = TREE_TYPE (element);
1767 if (TREE_CODE (element) == RECORD_TYPE
1768 || TREE_CODE (element) == UNION_TYPE)
1769 scope->incomplete_list = tree_cons (NULL_TREE, x,
1770 scope->incomplete_list);
1774 /* Put decls on list in reverse order.
1775 We will reverse them later if necessary. */
1776 TREE_CHAIN (x) = scope->names;
1782 /* Record X as belonging to the global scope (C99 "file scope").
1783 This is used only internally by the Objective C front end,
1784 and is limited to its needs. It will hork if there is _any_
1785 visible binding for X (not just a global one). */
1787 pushdecl_top_level (x)
1792 if (TREE_CODE (x) != VAR_DECL)
1795 name = DECL_NAME (x);
1796 old = IDENTIFIER_SYMBOL_VALUE (name);
1800 if (DECL_CONTEXT (old))
1803 if (!duplicate_decls (x, old, 0))
1809 DECL_CONTEXT (x) = 0;
1810 IDENTIFIER_SYMBOL_VALUE (name) = x;
1811 TREE_CHAIN (x) = global_binding_level->names;
1812 global_binding_level->names = x;
1816 /* Record X as belonging to the outermost scope of the current
1817 function. This is used only internally, by c_make_fname_decl and
1818 build_external_ref, and is limited to their needs. The NAME is
1819 provided as a separate argument because build_external_ref wants to
1820 use error_mark_node for X. For VAR_DECLs, duplicate_decls is not
1821 called; if there is any preexisting decl for this identifier, it is
1824 pushdecl_function_level (x, name)
1828 struct binding_level *scope;
1830 scope = current_binding_level;
1831 while (scope->function_body == 0)
1832 scope = scope->level_chain;
1836 if (x == error_mark_node)
1837 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1839 else if (TREE_CODE (x) == VAR_DECL)
1841 if (name != DECL_NAME (x))
1843 if (IDENTIFIER_SYMBOL_VALUE (name))
1846 DECL_CONTEXT (x) = current_function_decl;
1847 TREE_CHAIN (x) = scope->names;
1851 IDENTIFIER_SYMBOL_VALUE (name) = x;
1855 /* Generate an implicit declaration for identifier FUNCTIONID as a
1856 function of type int (). */
1859 implicitly_declare (functionid)
1862 tree decl = any_external_decl (functionid);
1864 if (decl && decl != error_mark_node)
1866 /* Implicit declaration of a function already declared
1867 (somehow) in a different scope, or as a built-in.
1868 If this is the first time this has happened, warn;
1869 then recycle the old declaration. */
1870 if (!C_DECL_IMPLICIT (decl))
1872 implicit_decl_warning (DECL_NAME (decl));
1873 if (DECL_CONTEXT (decl))
1874 warning_with_decl (decl, "previous declaration of `%s'");
1875 C_DECL_IMPLICIT (decl) = 1;
1877 /* If this function is global, then it must already be in the
1878 global binding level, so there's no need to push it again. */
1879 if (current_binding_level == global_binding_level)
1881 /* If this is a local declaration, make a copy; we can't have
1882 the same DECL listed in two different binding levels. */
1883 return pushdecl (copy_node (decl));
1886 /* Not seen before. */
1887 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1888 DECL_EXTERNAL (decl) = 1;
1889 TREE_PUBLIC (decl) = 1;
1890 C_DECL_IMPLICIT (decl) = 1;
1891 implicit_decl_warning (functionid);
1893 /* ANSI standard says implicit declarations are in the innermost block.
1894 So we record the decl in the standard fashion. */
1895 decl = pushdecl (decl);
1897 /* No need to call objc_check_decl here - it's a function type. */
1898 rest_of_decl_compilation (decl, NULL, 0, 0);
1900 /* Write a record describing this implicit function declaration to the
1901 prototypes file (if requested). */
1903 gen_aux_info_record (decl, 0, 1, 0);
1905 /* Possibly apply some default attributes to this implicit declaration. */
1906 decl_attributes (&decl, NULL_TREE, 0);
1912 implicit_decl_warning (id)
1915 const char *name = IDENTIFIER_POINTER (id);
1916 if (mesg_implicit_function_declaration == 2)
1917 error ("implicit declaration of function `%s'", name);
1918 else if (mesg_implicit_function_declaration == 1)
1919 warning ("implicit declaration of function `%s'", name);
1922 /* Return zero if the declaration NEWDECL is valid
1923 when the declaration OLDDECL (assumed to be for the same name)
1924 has already been seen.
1925 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
1926 and 3 if it is a conflicting declaration. */
1929 redeclaration_error_message (newdecl, olddecl)
1930 tree newdecl, olddecl;
1932 if (TREE_CODE (newdecl) == TYPE_DECL)
1934 /* Do not complain about type redeclarations where at least one
1935 declaration was in a system header. */
1936 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
1940 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1942 /* Declarations of functions can insist on internal linkage
1943 but they can't be inconsistent with internal linkage,
1944 so there can be no error on that account.
1945 However defining the same name twice is no good. */
1946 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
1947 /* However, defining once as extern inline and a second
1948 time in another way is ok. */
1949 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
1950 && ! (DECL_DECLARED_INLINE_P (newdecl)
1951 && DECL_EXTERNAL (newdecl))))
1955 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
1957 /* Objects declared at top level: */
1958 /* If at least one is a reference, it's ok. */
1959 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
1961 /* Reject two definitions. */
1962 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
1964 /* Now we have two tentative defs, or one tentative and one real def. */
1965 /* Insist that the linkage match. */
1966 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
1970 else if (current_binding_level->parm_flag
1971 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1975 /* Newdecl has block scope. If olddecl has block scope also, then
1976 reject two definitions, and reject a definition together with an
1977 external reference. Otherwise, it is OK, because newdecl must
1978 be an extern reference to olddecl. */
1979 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
1980 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
1986 /* Get the LABEL_DECL corresponding to identifier ID as a label.
1987 Create one if none exists so far for the current function.
1988 This function is called for both label definitions and label references. */
1994 tree decl = IDENTIFIER_LABEL_VALUE (id);
1996 if (current_function_decl == 0)
1998 error ("label %s referenced outside of any function",
1999 IDENTIFIER_POINTER (id));
2003 /* Use a label already defined or ref'd with this name. */
2006 /* But not if it is inherited and wasn't declared to be inheritable. */
2007 if (DECL_CONTEXT (decl) != current_function_decl
2008 && ! C_DECLARED_LABEL_FLAG (decl))
2009 return shadow_label (id);
2013 decl = build_decl (LABEL_DECL, id, void_type_node);
2015 /* A label not explicitly declared must be local to where it's ref'd. */
2016 DECL_CONTEXT (decl) = current_function_decl;
2018 DECL_MODE (decl) = VOIDmode;
2020 /* Say where one reference is to the label,
2021 for the sake of the error if it is not defined. */
2022 DECL_SOURCE_LINE (decl) = input_line;
2023 DECL_SOURCE_FILE (decl) = input_filename;
2025 IDENTIFIER_LABEL_VALUE (id) = decl;
2027 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2032 /* Make a label named NAME in the current function,
2033 shadowing silently any that may be inherited from containing functions
2034 or containing scopes.
2036 Note that valid use, if the label being shadowed
2037 comes from another scope in the same function,
2038 requires calling declare_nonlocal_label right away. */
2044 tree decl = IDENTIFIER_LABEL_VALUE (name);
2050 /* Check to make sure that the label hasn't already been declared
2051 at this label scope */
2052 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2053 if (TREE_VALUE (dup) == decl)
2055 error ("duplicate label declaration `%s'",
2056 IDENTIFIER_POINTER (name));
2057 error_with_decl (TREE_VALUE (dup),
2058 "this is a previous declaration");
2059 /* Just use the previous declaration. */
2060 return lookup_label (name);
2063 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2064 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2067 return lookup_label (name);
2070 /* Define a label, specifying the location in the source file.
2071 Return the LABEL_DECL node for the label, if the definition is valid.
2072 Otherwise return 0. */
2075 define_label (filename, line, name)
2076 const char *filename;
2080 tree decl = lookup_label (name);
2082 /* If label with this name is known from an outer context, shadow it. */
2083 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2085 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2086 IDENTIFIER_LABEL_VALUE (name) = 0;
2087 decl = lookup_label (name);
2090 if (warn_traditional && !in_system_header && lookup_name (name))
2091 warning_with_file_and_line (filename, line,
2092 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2093 IDENTIFIER_POINTER (name));
2095 if (DECL_INITIAL (decl) != 0)
2097 error_with_file_and_line (filename, line, "duplicate label `%s'",
2098 IDENTIFIER_POINTER (name));
2103 /* Mark label as having been defined. */
2104 DECL_INITIAL (decl) = error_mark_node;
2105 /* Say where in the source. */
2106 DECL_SOURCE_FILE (decl) = filename;
2107 DECL_SOURCE_LINE (decl) = line;
2112 /* Return the list of declarations of the current level.
2113 Note that this list is in reverse order unless/until
2114 you nreverse it; and when you do nreverse it, you must
2115 store the result back using `storedecls' or you will lose. */
2120 return current_binding_level->names;
2123 /* Return the list of type-tags (for structs, etc) of the current level. */
2128 return current_binding_level->tags;
2131 /* Store the list of declarations of the current level.
2132 This is done for the parameter declarations of a function being defined,
2133 after they are modified in the light of any missing parameters. */
2139 current_binding_level->names = decls;
2142 /* Similarly, store the list of tags of the current level. */
2148 current_binding_level->tags = tags;
2151 /* Given NAME, an IDENTIFIER_NODE,
2152 return the structure (or union or enum) definition for that name.
2153 If THISLEVEL_ONLY is nonzero, searches only the current_binding_level.
2154 CODE says which kind of type the caller wants;
2155 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2156 If the wrong kind of type is found, an error is reported. */
2159 lookup_tag (code, name, thislevel_only)
2160 enum tree_code code;
2164 tree tag = IDENTIFIER_TAG_VALUE (name);
2170 /* We only care about whether it's in this level if
2171 thislevel_only was set or it might be a type clash. */
2172 if (thislevel_only || TREE_CODE (tag) != code)
2174 if (current_binding_level == global_binding_level
2175 || purpose_member (name, current_binding_level->tags))
2179 if (thislevel_only && !thislevel)
2182 if (TREE_CODE (tag) != code)
2184 /* Definition isn't the kind we were looking for. */
2185 pending_invalid_xref = name;
2186 pending_invalid_xref_file = input_filename;
2187 pending_invalid_xref_line = input_line;
2189 /* If in the same binding level as a declaration as a tag
2190 of a different type, this must not be allowed to
2191 shadow that tag, so give the error immediately.
2192 (For example, "struct foo; union foo;" is invalid.) */
2194 pending_xref_error ();
2199 /* Print an error message now
2200 for a recent invalid struct, union or enum cross reference.
2201 We don't print them immediately because they are not invalid
2202 when used in the `struct foo;' construct for shadowing. */
2205 pending_xref_error ()
2207 if (pending_invalid_xref != 0)
2208 error_with_file_and_line (pending_invalid_xref_file,
2209 pending_invalid_xref_line,
2210 "`%s' defined as wrong kind of tag",
2211 IDENTIFIER_POINTER (pending_invalid_xref));
2212 pending_invalid_xref = 0;
2216 /* Look up NAME in the current binding level and its superiors
2217 in the namespace of variables, functions and typedefs.
2218 Return a ..._DECL node of some kind representing its definition,
2219 or return 0 if it is undefined. */
2225 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2226 if (decl == 0 || decl == error_mark_node)
2228 if (C_DECL_INVISIBLE (decl))
2233 /* Similar to `lookup_name' but look only at the current binding level. */
2236 lookup_name_current_level (name)
2239 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2241 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2244 if (current_binding_level == global_binding_level)
2247 /* Scan the current scope for a decl with name NAME. */
2248 if (chain_member (decl, current_binding_level->names))
2254 /* Create the predefined scalar types of C,
2255 and some nodes representing standard constants (0, 1, (void *) 0).
2256 Initialize the global binding level.
2257 Make definitions for built-in primitive functions. */
2260 c_init_decl_processing ()
2263 tree ptr_ftype_void, ptr_ftype_ptr;
2265 /* Adds some ggc roots, and reserved words for c-parse.in. */
2268 current_function_decl = NULL;
2269 named_labels = NULL;
2270 current_binding_level = NULL_BINDING_LEVEL;
2271 free_binding_level = NULL_BINDING_LEVEL;
2273 /* Make the binding_level structure for global names. */
2275 global_binding_level = current_binding_level;
2277 build_common_tree_nodes (flag_signed_char);
2279 c_common_nodes_and_builtins ();
2281 boolean_type_node = integer_type_node;
2282 boolean_true_node = integer_one_node;
2283 boolean_false_node = integer_zero_node;
2285 c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
2286 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2287 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2288 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2289 TYPE_PRECISION (c_bool_type_node) = 1;
2290 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2292 c_bool_false_node = build_int_2 (0, 0);
2293 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2294 c_bool_true_node = build_int_2 (1, 0);
2295 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2297 endlink = void_list_node;
2298 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2300 = build_function_type (ptr_type_node,
2301 tree_cons (NULL_TREE, ptr_type_node, endlink));
2303 pedantic_lvalues = pedantic;
2305 make_fname_decl = c_make_fname_decl;
2306 start_fname_decls ();
2309 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2310 decl, NAME is the initialization string and TYPE_DEP indicates whether
2311 NAME depended on the type of the function. As we don't yet implement
2312 delayed emission of static data, we mark the decl as emitted
2313 so it is not placed in the output. Anything using it must therefore pull
2314 out the STRING_CST initializer directly. This does mean that these names
2315 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2318 c_make_fname_decl (id, type_dep)
2322 const char *name = fname_as_string (type_dep);
2323 tree decl, type, init;
2324 size_t length = strlen (name);
2326 type = build_array_type
2327 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2328 build_index_type (size_int (length)));
2330 decl = build_decl (VAR_DECL, id, type);
2332 TREE_STATIC (decl) = 1;
2333 TREE_READONLY (decl) = 1;
2334 DECL_ARTIFICIAL (decl) = 1;
2336 init = build_string (length + 1, name);
2337 TREE_TYPE (init) = type;
2338 DECL_INITIAL (decl) = init;
2340 TREE_USED (decl) = 1;
2342 if (current_function_decl)
2343 pushdecl_function_level (decl, DECL_NAME (decl));
2345 finish_decl (decl, init, NULL_TREE);
2350 /* Return a definition for a builtin function named NAME and whose data type
2351 is TYPE. TYPE should be a function type with argument types.
2352 FUNCTION_CODE tells later passes how to compile calls to this function.
2353 See tree.h for its possible values.
2355 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2356 the name to be called if we can't opencode the function. If
2357 ATTRS is nonzero, use that for the function's attribute list. */
2360 builtin_function (name, type, function_code, class, library_name, attrs)
2364 enum built_in_class class;
2365 const char *library_name;
2368 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2369 DECL_EXTERNAL (decl) = 1;
2370 TREE_PUBLIC (decl) = 1;
2372 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2373 make_decl_rtl (decl, NULL);
2375 DECL_BUILT_IN_CLASS (decl) = class;
2376 DECL_FUNCTION_CODE (decl) = function_code;
2378 /* Warn if a function in the namespace for users
2379 is used without an occasion to consider it declared. */
2380 if (name[0] != '_' || name[1] != '_')
2381 C_DECL_INVISIBLE (decl) = 1;
2383 /* Possibly apply some default attributes to this built-in function. */
2385 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2387 decl_attributes (&decl, NULL_TREE, 0);
2392 /* Apply default attributes to a function, if a system function with default
2396 c_insert_default_attributes (decl)
2399 if (!TREE_PUBLIC (decl))
2401 c_common_insert_default_attributes (decl);
2404 /* Called when a declaration is seen that contains no names to declare.
2405 If its type is a reference to a structure, union or enum inherited
2406 from a containing scope, shadow that tag name for the current scope
2407 with a forward reference.
2408 If its type defines a new named structure or union
2409 or defines an enum, it is valid but we need not do anything here.
2410 Otherwise, it is an error. */
2413 shadow_tag (declspecs)
2416 shadow_tag_warned (declspecs, 0);
2420 shadow_tag_warned (declspecs, warned)
2423 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2430 pending_invalid_xref = 0;
2432 /* Remove the attributes from declspecs, since they will confuse the
2434 split_specs_attrs (declspecs, &specs, &attrs);
2436 for (link = specs; link; link = TREE_CHAIN (link))
2438 tree value = TREE_VALUE (link);
2439 enum tree_code code = TREE_CODE (value);
2441 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2442 /* Used to test also that TYPE_SIZE (value) != 0.
2443 That caused warning for `struct foo;' at top level in the file. */
2445 tree name = TYPE_NAME (value);
2452 if (warned != 1 && code != ENUMERAL_TYPE)
2453 /* Empty unnamed enum OK */
2455 pedwarn ("unnamed struct/union that defines no instances");
2461 t = lookup_tag (code, name, 1);
2465 t = make_node (code);
2472 if (!warned && ! in_system_header)
2474 warning ("useless keyword or type name in empty declaration");
2481 error ("two types specified in one empty declaration");
2486 pedwarn ("empty declaration");
2490 /* Construct an array declarator. EXPR is the expression inside [], or
2491 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2492 to the pointer to which a parameter array is converted). STATIC_P is
2493 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2494 is nonzero is the array is [*], a VLA of unspecified length which is
2495 nevertheless a complete type (not currently implemented by GCC),
2496 zero otherwise. The declarator is constructed as an ARRAY_REF
2497 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2498 left of the [] (filled by in set_array_declarator_type) and operand 1
2499 is the expression inside; whose TREE_TYPE is the type qualifiers and
2500 which has TREE_STATIC set if "static" is used. */
2503 build_array_declarator (expr, quals, static_p, vla_unspec_p)
2510 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2511 TREE_TYPE (decl) = quals;
2512 TREE_STATIC (decl) = (static_p ? 1 : 0);
2513 if (pedantic && !flag_isoc99)
2515 if (static_p || quals != NULL_TREE)
2516 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2518 pedwarn ("ISO C90 does not support `[*]' array declarators");
2521 warning ("GCC does not yet properly implement `[*]' array declarators");
2525 /* Set the type of an array declarator. DECL is the declarator, as
2526 constructed by build_array_declarator; TYPE is what appears on the left
2527 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2528 abstract declarator, zero otherwise; this is used to reject static and
2529 type qualifiers in abstract declarators, where they are not in the
2533 set_array_declarator_type (decl, type, abstract_p)
2538 TREE_OPERAND (decl, 0) = type;
2539 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2540 error ("static or type qualifiers in abstract declarator");
2544 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2547 groktypename (typename)
2552 if (TREE_CODE (typename) != TREE_LIST)
2555 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2557 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
2559 /* Apply attributes. */
2560 decl_attributes (&typename, attrs, 0);
2565 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2568 groktypename_in_parm_context (typename)
2571 if (TREE_CODE (typename) != TREE_LIST)
2573 return grokdeclarator (TREE_VALUE (typename),
2574 TREE_PURPOSE (typename),
2578 /* Decode a declarator in an ordinary declaration or data definition.
2579 This is called as soon as the type information and variable name
2580 have been parsed, before parsing the initializer if any.
2581 Here we create the ..._DECL node, fill in its type,
2582 and put it on the list of decls for the current context.
2583 The ..._DECL node is returned as the value.
2585 Exception: for arrays where the length is not specified,
2586 the type is left null, to be filled in by `finish_decl'.
2588 Function definitions do not come here; they go to start_function
2589 instead. However, external and forward declarations of functions
2590 do go through here. Structure field declarations are done by
2591 grokfield and not through here. */
2594 start_decl (declarator, declspecs, initialized, attributes)
2595 tree declarator, declspecs;
2602 /* An object declared as __attribute__((deprecated)) suppresses
2603 warnings of uses of other deprecated items. */
2604 if (lookup_attribute ("deprecated", attributes))
2605 deprecated_state = DEPRECATED_SUPPRESS;
2607 decl = grokdeclarator (declarator, declspecs,
2608 NORMAL, initialized);
2610 deprecated_state = DEPRECATED_NORMAL;
2612 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2613 && MAIN_NAME_P (DECL_NAME (decl)))
2614 warning_with_decl (decl, "`%s' is usually a function");
2617 /* Is it valid for this decl to have an initializer at all?
2618 If not, set INITIALIZED to zero, which will indirectly
2619 tell `finish_decl' to ignore the initializer once it is parsed. */
2620 switch (TREE_CODE (decl))
2623 error ("typedef `%s' is initialized (use __typeof__ instead)",
2624 IDENTIFIER_POINTER (DECL_NAME (decl)));
2629 error ("function `%s' is initialized like a variable",
2630 IDENTIFIER_POINTER (DECL_NAME (decl)));
2635 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2636 error ("parameter `%s' is initialized",
2637 IDENTIFIER_POINTER (DECL_NAME (decl)));
2642 /* Don't allow initializations for incomplete types
2643 except for arrays which might be completed by the initialization. */
2645 /* This can happen if the array size is an undefined macro. We already
2646 gave a warning, so we don't need another one. */
2647 if (TREE_TYPE (decl) == error_mark_node)
2649 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2651 /* A complete type is ok if size is fixed. */
2653 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2654 || C_DECL_VARIABLE_SIZE (decl))
2656 error ("variable-sized object may not be initialized");
2660 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2662 error ("variable `%s' has initializer but incomplete type",
2663 IDENTIFIER_POINTER (DECL_NAME (decl)));
2666 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2668 error ("elements of array `%s' have incomplete type",
2669 IDENTIFIER_POINTER (DECL_NAME (decl)));
2677 /* Seems redundant with grokdeclarator. */
2678 if (current_binding_level != global_binding_level
2679 && DECL_EXTERNAL (decl)
2680 && TREE_CODE (decl) != FUNCTION_DECL)
2681 warning ("declaration of `%s' has `extern' and is initialized",
2682 IDENTIFIER_POINTER (DECL_NAME (decl)));
2684 DECL_EXTERNAL (decl) = 0;
2685 if (current_binding_level == global_binding_level)
2686 TREE_STATIC (decl) = 1;
2688 /* Tell `pushdecl' this is an initialized decl
2689 even though we don't yet have the initializer expression.
2690 Also tell `finish_decl' it may store the real initializer. */
2691 DECL_INITIAL (decl) = error_mark_node;
2694 /* If this is a function declaration, write a record describing it to the
2695 prototypes file (if requested). */
2697 if (TREE_CODE (decl) == FUNCTION_DECL)
2698 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2700 /* ANSI specifies that a tentative definition which is not merged with
2701 a non-tentative definition behaves exactly like a definition with an
2702 initializer equal to zero. (Section 3.7.2)
2704 -fno-common gives strict ANSI behavior, though this tends to break
2705 a large body of code that grew up without this rule.
2707 Thread-local variables are never common, since there's no entrenched
2708 body of code to break, and it allows more efficient variable references
2709 in the presence of dynamic linking. */
2711 if (TREE_CODE (decl) == VAR_DECL
2713 && TREE_PUBLIC (decl)
2714 && !DECL_THREAD_LOCAL (decl)
2716 DECL_COMMON (decl) = 1;
2718 /* Set attributes here so if duplicate decl, will have proper attributes. */
2719 decl_attributes (&decl, attributes, 0);
2721 /* If #pragma weak was used, mark the decl weak now. */
2722 if (current_binding_level == global_binding_level)
2723 maybe_apply_pragma_weak (decl);
2725 if (TREE_CODE (decl) == FUNCTION_DECL
2726 && DECL_DECLARED_INLINE_P (decl)
2727 && DECL_UNINLINABLE (decl)
2728 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2729 warning_with_decl (decl,
2730 "inline function `%s' given attribute noinline");
2732 /* Add this decl to the current binding level.
2733 TEM may equal DECL or it may be a previous decl of the same name. */
2734 tem = pushdecl (decl);
2736 /* For a local variable, define the RTL now. */
2737 if (current_binding_level != global_binding_level
2738 /* But not if this is a duplicate decl
2739 and we preserved the rtl from the previous one
2740 (which may or may not happen). */
2741 && !DECL_RTL_SET_P (tem)
2742 && !DECL_CONTEXT (tem))
2744 if (TREE_TYPE (tem) != error_mark_node
2745 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
2747 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2748 && DECL_INITIAL (tem) != 0)
2755 /* Finish processing of a declaration;
2756 install its initial value.
2757 If the length of an array type is not known before,
2758 it must be determined now, from the initial value, or it is an error. */
2761 finish_decl (decl, init, asmspec_tree)
2765 tree type = TREE_TYPE (decl);
2766 int was_incomplete = (DECL_SIZE (decl) == 0);
2767 const char *asmspec = 0;
2769 /* If a name was specified, get the string. */
2770 if (current_binding_level == global_binding_level)
2771 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2773 asmspec = TREE_STRING_POINTER (asmspec_tree);
2775 /* If `start_decl' didn't like having an initialization, ignore it now. */
2776 if (init != 0 && DECL_INITIAL (decl) == 0)
2779 /* Don't crash if parm is initialized. */
2780 if (TREE_CODE (decl) == PARM_DECL)
2784 store_init_value (decl, init);
2786 /* Deduce size of array from initialization, if not already known */
2787 if (TREE_CODE (type) == ARRAY_TYPE
2788 && TYPE_DOMAIN (type) == 0
2789 && TREE_CODE (decl) != TYPE_DECL)
2792 = (TREE_STATIC (decl)
2793 /* Even if pedantic, an external linkage array
2794 may have incomplete type at first. */
2795 ? pedantic && !TREE_PUBLIC (decl)
2796 : !DECL_EXTERNAL (decl));
2798 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2800 /* Get the completed type made by complete_array_type. */
2801 type = TREE_TYPE (decl);
2804 error_with_decl (decl, "initializer fails to determine size of `%s'");
2806 else if (failure == 2)
2809 error_with_decl (decl, "array size missing in `%s'");
2810 /* If a `static' var's size isn't known,
2811 make it extern as well as static, so it does not get
2813 If it is not `static', then do not mark extern;
2814 finish_incomplete_decl will give it a default size
2815 and it will get allocated. */
2816 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2817 DECL_EXTERNAL (decl) = 1;
2820 /* TYPE_MAX_VALUE is always one less than the number of elements
2821 in the array, because we start counting at zero. Therefore,
2822 warn only if the value is less than zero. */
2823 else if (pedantic && TYPE_DOMAIN (type) != 0
2824 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2825 error_with_decl (decl, "zero or negative size array `%s'");
2827 layout_decl (decl, 0);
2830 if (TREE_CODE (decl) == VAR_DECL)
2832 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2833 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2834 layout_decl (decl, 0);
2836 if (DECL_SIZE (decl) == 0
2837 /* Don't give an error if we already gave one earlier. */
2838 && TREE_TYPE (decl) != error_mark_node
2839 && (TREE_STATIC (decl)
2841 /* A static variable with an incomplete type
2842 is an error if it is initialized.
2843 Also if it is not file scope.
2844 Otherwise, let it through, but if it is not `extern'
2845 then it may cause an error message later. */
2846 (DECL_INITIAL (decl) != 0
2847 || DECL_CONTEXT (decl) != 0)
2849 /* An automatic variable with an incomplete type
2851 !DECL_EXTERNAL (decl)))
2853 error_with_decl (decl, "storage size of `%s' isn't known");
2854 TREE_TYPE (decl) = error_mark_node;
2857 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2858 && DECL_SIZE (decl) != 0)
2860 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2861 constant_expression_warning (DECL_SIZE (decl));
2863 error_with_decl (decl, "storage size of `%s' isn't constant");
2866 if (TREE_USED (type))
2867 TREE_USED (decl) = 1;
2870 /* If this is a function and an assembler name is specified, reset DECL_RTL
2871 so we can give it its new name. Also, update built_in_decls if it
2872 was a normal built-in. */
2873 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2875 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2877 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2878 SET_DECL_RTL (builtin, NULL_RTX);
2879 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (asmspec));
2880 #ifdef TARGET_MEM_FUNCTIONS
2881 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2882 init_block_move_fn (asmspec);
2883 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2884 init_block_clear_fn (asmspec);
2886 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2887 init_block_move_fn (asmspec);
2888 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2889 init_block_clear_fn (asmspec);
2892 SET_DECL_RTL (decl, NULL_RTX);
2893 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
2896 /* Output the assembler code and/or RTL code for variables and functions,
2897 unless the type is an undefined structure or union.
2898 If not, it will get done when the type is completed. */
2900 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2902 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2904 objc_check_decl (decl);
2906 if (!DECL_CONTEXT (decl))
2908 if (DECL_INITIAL (decl) == NULL_TREE
2909 || DECL_INITIAL (decl) == error_mark_node)
2910 /* Don't output anything
2911 when a tentative file-scope definition is seen.
2912 But at end of compilation, do output code for them. */
2913 DECL_DEFER_OUTPUT (decl) = 1;
2914 rest_of_decl_compilation (decl, asmspec,
2915 (DECL_CONTEXT (decl) == 0
2916 || TREE_ASM_WRITTEN (decl)), 0);
2920 /* This is a local variable. If there is an ASMSPEC, the
2921 user has requested that we handle it specially. */
2924 /* In conjunction with an ASMSPEC, the `register'
2925 keyword indicates that we should place the variable
2926 in a particular register. */
2927 if (DECL_REGISTER (decl))
2928 DECL_C_HARD_REGISTER (decl) = 1;
2930 /* If this is not a static variable, issue a warning.
2931 It doesn't make any sense to give an ASMSPEC for an
2932 ordinary, non-register local variable. Historically,
2933 GCC has accepted -- but ignored -- the ASMSPEC in
2935 if (TREE_CODE (decl) == VAR_DECL
2936 && !DECL_REGISTER (decl)
2937 && !TREE_STATIC (decl))
2938 warning_with_decl (decl,
2939 "ignoring asm-specifier for non-static local variable `%s'");
2941 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
2944 if (TREE_CODE (decl) != FUNCTION_DECL)
2945 add_decl_stmt (decl);
2948 if (DECL_CONTEXT (decl) != 0)
2950 /* Recompute the RTL of a local array now
2951 if it used to be an incomplete type. */
2953 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2955 /* If we used it already as memory, it must stay in memory. */
2956 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2957 /* If it's still incomplete now, no init will save it. */
2958 if (DECL_SIZE (decl) == 0)
2959 DECL_INITIAL (decl) = 0;
2964 if (TREE_CODE (decl) == TYPE_DECL)
2966 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2968 objc_check_decl (decl);
2969 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
2972 /* At the end of a declaration, throw away any variable type sizes
2973 of types defined inside that declaration. There is no use
2974 computing them in the following function definition. */
2975 if (current_binding_level == global_binding_level)
2976 get_pending_sizes ();
2979 /* Given a parsed parameter declaration,
2980 decode it into a PARM_DECL and push that on the current binding level.
2981 Also, for the sake of forward parm decls,
2982 record the given order of parms in `parm_order'. */
2985 push_parm_decl (parm)
2989 int old_immediate_size_expand = immediate_size_expand;
2990 /* Don't try computing parm sizes now -- wait till fn is called. */
2991 immediate_size_expand = 0;
2993 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
2994 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
2995 decl_attributes (&decl, TREE_VALUE (parm), 0);
2998 if (DECL_NAME (decl))
3001 olddecl = lookup_name (DECL_NAME (decl));
3002 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3003 pedwarn_with_decl (decl,
3004 "ISO C forbids parameter `%s' shadowing typedef");
3008 decl = pushdecl (decl);
3010 immediate_size_expand = old_immediate_size_expand;
3012 current_binding_level->parm_order
3013 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3015 /* Add this decl to the current binding level. */
3016 finish_decl (decl, NULL_TREE, NULL_TREE);
3019 /* Clear the given order of parms in `parm_order'.
3020 Used at start of parm list,
3021 and also at semicolon terminating forward decls. */
3026 current_binding_level->parm_order = NULL_TREE;
3029 static GTY(()) int compound_literal_number;
3031 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3032 literal, which may be an incomplete array type completed by the
3033 initializer; INIT is a CONSTRUCTOR that initializes the compound
3037 build_compound_literal (type, init)
3041 /* We do not use start_decl here because we have a type, not a declarator;
3042 and do not use finish_decl because the decl should be stored inside
3043 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3044 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3047 DECL_EXTERNAL (decl) = 0;
3048 TREE_PUBLIC (decl) = 0;
3049 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3050 DECL_CONTEXT (decl) = current_function_decl;
3051 TREE_USED (decl) = 1;
3052 TREE_TYPE (decl) = type;
3053 TREE_READONLY (decl) = TREE_READONLY (type);
3054 store_init_value (decl, init);
3056 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3058 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3063 type = TREE_TYPE (decl);
3064 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3065 return error_mark_node;
3067 stmt = build_stmt (DECL_STMT, decl);
3068 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3069 TREE_SIDE_EFFECTS (complit) = 1;
3071 layout_decl (decl, 0);
3073 if (TREE_STATIC (decl))
3075 /* This decl needs a name for the assembler output. We also need
3076 a unique suffix to be added to the name. */
3079 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3080 compound_literal_number);
3081 compound_literal_number++;
3082 DECL_NAME (decl) = get_identifier (name);
3083 DECL_DEFER_OUTPUT (decl) = 1;
3084 DECL_COMDAT (decl) = 1;
3085 DECL_ARTIFICIAL (decl) = 1;
3087 rest_of_decl_compilation (decl, NULL, 1, 0);
3093 /* Make TYPE a complete type based on INITIAL_VALUE.
3094 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3095 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3098 complete_array_type (type, initial_value, do_default)
3103 tree maxindex = NULL_TREE;
3108 /* Note MAXINDEX is really the maximum index,
3109 one less than the size. */
3110 if (TREE_CODE (initial_value) == STRING_CST)
3113 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3114 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3117 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3119 tree elts = CONSTRUCTOR_ELTS (initial_value);
3120 maxindex = build_int_2 (-1, -1);
3121 for (; elts; elts = TREE_CHAIN (elts))
3123 if (TREE_PURPOSE (elts))
3124 maxindex = TREE_PURPOSE (elts);
3126 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3127 maxindex, integer_one_node));
3129 maxindex = copy_node (maxindex);
3133 /* Make an error message unless that happened already. */
3134 if (initial_value != error_mark_node)
3137 /* Prevent further error messages. */
3138 maxindex = build_int_2 (0, 0);
3145 maxindex = build_int_2 (0, 0);
3151 TYPE_DOMAIN (type) = build_index_type (maxindex);
3152 if (!TREE_TYPE (maxindex))
3153 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3156 /* Lay out the type now that we can get the real answer. */
3163 /* Determine whether TYPE is a structure with a flexible array member,
3164 or a union containing such a structure (possibly recursively). */
3167 flexible_array_type_p (type)
3171 switch (TREE_CODE (type))
3174 x = TYPE_FIELDS (type);
3177 while (TREE_CHAIN (x) != NULL_TREE)
3179 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3180 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3181 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3182 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3186 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3188 if (flexible_array_type_p (TREE_TYPE (x)))
3197 /* Given declspecs and a declarator,
3198 determine the name and type of the object declared
3199 and construct a ..._DECL node for it.
3200 (In one case we can return a ..._TYPE node instead.
3201 For invalid input we sometimes return 0.)
3203 DECLSPECS is a chain of tree_list nodes whose value fields
3204 are the storage classes and type specifiers.
3206 DECL_CONTEXT says which syntactic context this declaration is in:
3207 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3208 FUNCDEF for a function definition. Like NORMAL but a few different
3209 error messages in each case. Return value may be zero meaning
3210 this definition is too screwy to try to parse.
3211 PARM for a parameter declaration (either within a function prototype
3212 or before a function body). Make a PARM_DECL, or return void_type_node.
3213 TYPENAME if for a typename (in a cast or sizeof).
3214 Don't make a DECL node; just return the ..._TYPE node.
3215 FIELD for a struct or union field; make a FIELD_DECL.
3216 BITFIELD for a field with specified width.
3217 INITIALIZED is 1 if the decl has an initializer.
3219 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3220 It may also be so in the PARM case, for a prototype where the
3221 argument type is specified but not the name.
3223 This function is where the complicated C meanings of `static'
3224 and `extern' are interpreted. */
3227 grokdeclarator (declarator, declspecs, decl_context, initialized)
3230 enum decl_context decl_context;
3235 tree type = NULL_TREE;
3240 int type_quals = TYPE_UNQUALIFIED;
3242 int explicit_int = 0;
3243 int explicit_char = 0;
3244 int defaulted_int = 0;
3245 tree typedef_decl = 0;
3247 tree typedef_type = 0;
3248 int funcdef_flag = 0;
3249 enum tree_code innermost_code = ERROR_MARK;
3251 int size_varies = 0;
3252 tree decl_attr = NULL_TREE;
3253 tree array_ptr_quals = NULL_TREE;
3254 int array_parm_static = 0;
3255 tree returned_attrs = NULL_TREE;
3257 if (decl_context == BITFIELD)
3258 bitfield = 1, decl_context = FIELD;
3260 if (decl_context == FUNCDEF)
3261 funcdef_flag = 1, decl_context = NORMAL;
3263 /* Look inside a declarator for the name being declared
3264 and get it as a string, for an error message. */
3266 tree decl = declarator;
3270 switch (TREE_CODE (decl))
3275 innermost_code = TREE_CODE (decl);
3276 decl = TREE_OPERAND (decl, 0);
3280 decl = TREE_VALUE (decl);
3283 case IDENTIFIER_NODE:
3284 name = IDENTIFIER_POINTER (decl);
3295 /* A function definition's declarator must have the form of
3296 a function declarator. */
3298 if (funcdef_flag && innermost_code != CALL_EXPR)
3301 /* Anything declared one level down from the top level
3302 must be one of the parameters of a function
3303 (because the body is at least two levels down). */
3305 /* If this looks like a function definition, make it one,
3306 even if it occurs where parms are expected.
3307 Then store_parm_decls will reject it and not use it as a parm. */
3308 if (decl_context == NORMAL && !funcdef_flag
3309 && current_binding_level->parm_flag)
3310 decl_context = PARM;
3312 /* Look through the decl specs and record which ones appear.
3313 Some typespecs are defined as built-in typenames.
3314 Others, the ones that are modifiers of other types,
3315 are represented by bits in SPECBITS: set the bits for
3316 the modifiers that appear. Storage class keywords are also in SPECBITS.
3318 If there is a typedef name or a type, store the type in TYPE.
3319 This includes builtin typedefs such as `int'.
3321 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3322 and did not come from a user typedef.
3324 Set LONGLONG if `long' is mentioned twice. */
3326 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3328 tree id = TREE_VALUE (spec);
3330 /* If the entire declaration is itself tagged as deprecated then
3331 suppress reports of deprecated items. */
3332 if (id && TREE_DEPRECATED (id))
3334 if (deprecated_state != DEPRECATED_SUPPRESS)
3335 warn_deprecated_use (id);
3338 if (id == ridpointers[(int) RID_INT])
3340 if (id == ridpointers[(int) RID_CHAR])
3343 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3345 enum rid i = C_RID_CODE (id);
3346 if ((int) i <= (int) RID_LAST_MODIFIER)
3348 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3351 error ("`long long long' is too long for GCC");
3354 if (pedantic && !flag_isoc99 && ! in_system_header
3356 pedwarn ("ISO C90 does not support `long long'");
3360 else if (specbits & (1 << (int) i))
3362 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3365 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3368 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3371 /* Diagnose "__thread extern". Recall that this list
3372 is in the reverse order seen in the text. */
3374 && (specbits & (1 << (int) RID_EXTERN
3375 | 1 << (int) RID_STATIC)))
3377 if (specbits & 1 << (int) RID_EXTERN)
3378 error ("`__thread' before `extern'");
3380 error ("`__thread' before `static'");
3383 specbits |= 1 << (int) i;
3388 error ("two or more data types in declaration of `%s'", name);
3389 /* Actual typedefs come to us as TYPE_DECL nodes. */
3390 else if (TREE_CODE (id) == TYPE_DECL)
3392 if (TREE_TYPE (id) == error_mark_node)
3393 ; /* Allow the type to default to int to avoid cascading errors. */
3396 type = TREE_TYPE (id);
3397 decl_attr = DECL_ATTRIBUTES (id);
3401 /* Built-in types come as identifiers. */
3402 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3404 tree t = lookup_name (id);
3405 if (TREE_TYPE (t) == error_mark_node)
3407 else if (!t || TREE_CODE (t) != TYPE_DECL)
3408 error ("`%s' fails to be a typedef or built in type",
3409 IDENTIFIER_POINTER (id));
3412 type = TREE_TYPE (t);
3416 else if (TREE_CODE (id) != ERROR_MARK)
3423 typedef_type = type;
3425 size_varies = C_TYPE_VARIABLE_SIZE (type);
3427 /* No type at all: default to `int', and set DEFAULTED_INT
3428 because it was not a user-defined typedef. */
3432 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3433 | (1 << (int) RID_SIGNED)
3434 | (1 << (int) RID_UNSIGNED)
3435 | (1 << (int) RID_COMPLEX))))
3436 /* Don't warn about typedef foo = bar. */
3437 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3438 && ! in_system_header)
3440 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3441 and this is a function, or if -Wimplicit; prefer the former
3442 warning since it is more explicit. */
3443 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3445 warn_about_return_type = 1;
3446 else if (warn_implicit_int || flag_isoc99)
3447 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3452 type = integer_type_node;
3455 /* Now process the modifiers that were specified
3456 and check for invalid combinations. */
3458 /* Long double is a special combination. */
3460 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3461 && TYPE_MAIN_VARIANT (type) == double_type_node)
3463 specbits &= ~(1 << (int) RID_LONG);
3464 type = long_double_type_node;
3467 /* Check all other uses of type modifiers. */
3469 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3470 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3474 if ((specbits & 1 << (int) RID_LONG)
3475 && (specbits & 1 << (int) RID_SHORT))
3476 error ("both long and short specified for `%s'", name);
3477 else if (((specbits & 1 << (int) RID_LONG)
3478 || (specbits & 1 << (int) RID_SHORT))
3480 error ("long or short specified with char for `%s'", name);
3481 else if (((specbits & 1 << (int) RID_LONG)
3482 || (specbits & 1 << (int) RID_SHORT))
3483 && TREE_CODE (type) == REAL_TYPE)
3485 static int already = 0;
3487 error ("long or short specified with floating type for `%s'", name);
3488 if (! already && ! pedantic)
3490 error ("the only valid combination is `long double'");
3494 else if ((specbits & 1 << (int) RID_SIGNED)
3495 && (specbits & 1 << (int) RID_UNSIGNED))
3496 error ("both signed and unsigned specified for `%s'", name);
3497 else if (TREE_CODE (type) != INTEGER_TYPE)
3498 error ("long, short, signed or unsigned invalid for `%s'", name);
3502 if (!explicit_int && !defaulted_int && !explicit_char)
3504 error ("long, short, signed or unsigned used invalidly for `%s'",
3510 /* Discard the type modifiers if they are invalid. */
3513 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3514 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3519 if ((specbits & (1 << (int) RID_COMPLEX))
3520 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3522 error ("complex invalid for `%s'", name);
3523 specbits &= ~(1 << (int) RID_COMPLEX);
3526 /* Decide whether an integer type is signed or not.
3527 Optionally treat bitfields as signed by default. */
3528 if (specbits & 1 << (int) RID_UNSIGNED
3529 || (bitfield && ! flag_signed_bitfields
3530 && (explicit_int || defaulted_int || explicit_char
3531 /* A typedef for plain `int' without `signed'
3532 can be controlled just like plain `int'. */
3533 || ! (typedef_decl != 0
3534 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3535 && TREE_CODE (type) != ENUMERAL_TYPE
3536 && !(specbits & 1 << (int) RID_SIGNED)))
3539 type = long_long_unsigned_type_node;
3540 else if (specbits & 1 << (int) RID_LONG)
3541 type = long_unsigned_type_node;
3542 else if (specbits & 1 << (int) RID_SHORT)
3543 type = short_unsigned_type_node;
3544 else if (type == char_type_node)
3545 type = unsigned_char_type_node;
3546 else if (typedef_decl)
3547 type = c_common_unsigned_type (type);
3549 type = unsigned_type_node;
3551 else if ((specbits & 1 << (int) RID_SIGNED)
3552 && type == char_type_node)
3553 type = signed_char_type_node;
3555 type = long_long_integer_type_node;
3556 else if (specbits & 1 << (int) RID_LONG)
3557 type = long_integer_type_node;
3558 else if (specbits & 1 << (int) RID_SHORT)
3559 type = short_integer_type_node;
3561 if (specbits & 1 << (int) RID_COMPLEX)
3563 if (pedantic && !flag_isoc99)
3564 pedwarn ("ISO C90 does not support complex types");
3565 /* If we just have "complex", it is equivalent to
3566 "complex double", but if any modifiers at all are specified it is
3567 the complex form of TYPE. E.g, "complex short" is
3568 "complex short int". */
3570 if (defaulted_int && ! longlong
3571 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3572 | (1 << (int) RID_SIGNED)
3573 | (1 << (int) RID_UNSIGNED))))
3576 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3577 type = complex_double_type_node;
3579 else if (type == integer_type_node)
3582 pedwarn ("ISO C does not support complex integer types");
3583 type = complex_integer_type_node;
3585 else if (type == float_type_node)
3586 type = complex_float_type_node;
3587 else if (type == double_type_node)
3588 type = complex_double_type_node;
3589 else if (type == long_double_type_node)
3590 type = complex_long_double_type_node;
3594 pedwarn ("ISO C does not support complex integer types");
3595 type = build_complex_type (type);
3599 /* Figure out the type qualifiers for the declaration. There are
3600 two ways a declaration can become qualified. One is something
3601 like `const int i' where the `const' is explicit. Another is
3602 something like `typedef const int CI; CI i' where the type of the
3603 declaration contains the `const'. */
3604 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3605 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
3606 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3607 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3608 if (constp > 1 && ! flag_isoc99)
3609 pedwarn ("duplicate `const'");
3610 if (restrictp > 1 && ! flag_isoc99)
3611 pedwarn ("duplicate `restrict'");
3612 if (volatilep > 1 && ! flag_isoc99)
3613 pedwarn ("duplicate `volatile'");
3614 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3615 type = TYPE_MAIN_VARIANT (type);
3616 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3617 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3618 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3620 /* Warn if two storage classes are given. Default to `auto'. */
3625 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3626 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3627 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3628 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3629 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3631 /* "static __thread" and "extern __thread" are allowed. */
3632 if ((specbits & (1 << (int) RID_THREAD
3633 | 1 << (int) RID_STATIC
3634 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3637 /* Warn about storage classes that are invalid for certain
3638 kinds of declarations (parameters, typenames, etc.). */
3641 error ("multiple storage classes in declaration of `%s'", name);
3642 else if (funcdef_flag
3644 & ((1 << (int) RID_REGISTER)
3645 | (1 << (int) RID_AUTO)
3646 | (1 << (int) RID_TYPEDEF)
3647 | (1 << (int) RID_THREAD))))
3649 if (specbits & 1 << (int) RID_AUTO
3650 && (pedantic || current_binding_level == global_binding_level))
3651 pedwarn ("function definition declared `auto'");
3652 if (specbits & 1 << (int) RID_REGISTER)
3653 error ("function definition declared `register'");
3654 if (specbits & 1 << (int) RID_TYPEDEF)
3655 error ("function definition declared `typedef'");
3656 if (specbits & 1 << (int) RID_THREAD)
3657 error ("function definition declared `__thread'");
3658 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3659 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3661 else if (decl_context != NORMAL && nclasses > 0)
3663 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3667 switch (decl_context)
3670 error ("storage class specified for structure field `%s'",
3674 error ("storage class specified for parameter `%s'", name);
3677 error ("storage class specified for typename");
3680 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3681 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3682 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3685 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3687 /* `extern' with initialization is invalid if not at top level. */
3688 if (current_binding_level == global_binding_level)
3689 warning ("`%s' initialized and declared `extern'", name);
3691 error ("`%s' has both `extern' and initializer", name);
3693 else if (current_binding_level == global_binding_level)
3695 if (specbits & 1 << (int) RID_AUTO)
3696 error ("top-level declaration of `%s' specifies `auto'", name);
3700 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3701 error ("nested function `%s' declared `extern'", name);
3702 else if ((specbits & (1 << (int) RID_THREAD
3703 | 1 << (int) RID_EXTERN
3704 | 1 << (int) RID_STATIC))
3705 == (1 << (int) RID_THREAD))
3707 error ("function-scope `%s' implicitly auto and declared `__thread'",
3709 specbits &= ~(1 << (int) RID_THREAD);
3714 /* Now figure out the structure of the declarator proper.
3715 Descend through it, creating more complex types, until we reach
3716 the declared identifier (or NULL_TREE, in an absolute declarator). */
3718 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3720 if (type == error_mark_node)
3722 declarator = TREE_OPERAND (declarator, 0);
3726 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3727 an INDIRECT_REF (for *...),
3728 a CALL_EXPR (for ...(...)),
3729 a TREE_LIST (for nested attributes),
3730 an identifier (for the name being declared)
3731 or a null pointer (for the place in an absolute declarator
3732 where the name was omitted).
3733 For the last two cases, we have just exited the loop.
3735 At this point, TYPE is the type of elements of an array,
3736 or for a function to return, or for a pointer to point to.
3737 After this sequence of ifs, TYPE is the type of the
3738 array or function or pointer, and DECLARATOR has had its
3739 outermost layer removed. */
3741 if (array_ptr_quals != NULL_TREE || array_parm_static)
3743 /* Only the innermost declarator (making a parameter be of
3744 array type which is converted to pointer type)
3745 may have static or type qualifiers. */
3746 error ("static or type qualifiers in non-parameter array declarator");
3747 array_ptr_quals = NULL_TREE;
3748 array_parm_static = 0;
3751 if (TREE_CODE (declarator) == TREE_LIST)
3753 /* We encode a declarator with embedded attributes using
3755 tree attrs = TREE_PURPOSE (declarator);
3758 declarator = TREE_VALUE (declarator);
3759 inner_decl = declarator;
3760 while (inner_decl != NULL_TREE
3761 && TREE_CODE (inner_decl) == TREE_LIST)
3762 inner_decl = TREE_VALUE (inner_decl);
3763 if (inner_decl == NULL_TREE
3764 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3765 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3766 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3767 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3768 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3769 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3770 returned_attrs = decl_attributes (&type,
3771 chainon (returned_attrs, attrs),
3774 else if (TREE_CODE (declarator) == ARRAY_REF)
3776 tree itype = NULL_TREE;
3777 tree size = TREE_OPERAND (declarator, 1);
3778 /* The index is a signed object `sizetype' bits wide. */
3779 tree index_type = c_common_signed_type (sizetype);
3781 array_ptr_quals = TREE_TYPE (declarator);
3782 array_parm_static = TREE_STATIC (declarator);
3784 declarator = TREE_OPERAND (declarator, 0);
3786 /* Check for some types that there cannot be arrays of. */
3788 if (VOID_TYPE_P (type))
3790 error ("declaration of `%s' as array of voids", name);
3791 type = error_mark_node;
3794 if (TREE_CODE (type) == FUNCTION_TYPE)
3796 error ("declaration of `%s' as array of functions", name);
3797 type = error_mark_node;
3800 if (pedantic && flexible_array_type_p (type))
3801 pedwarn ("invalid use of structure with flexible array member");
3803 if (size == error_mark_node)
3804 type = error_mark_node;
3806 if (type == error_mark_node)
3809 /* If size was specified, set ITYPE to a range-type for that size.
3810 Otherwise, ITYPE remains null. finish_decl may figure it out
3811 from an initial value. */
3815 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3816 STRIP_TYPE_NOPS (size);
3818 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3820 error ("size of array `%s' has non-integer type", name);
3821 size = integer_one_node;
3824 if (pedantic && integer_zerop (size))
3825 pedwarn ("ISO C forbids zero-size array `%s'", name);
3827 if (TREE_CODE (size) == INTEGER_CST)
3829 constant_expression_warning (size);
3830 if (tree_int_cst_sgn (size) < 0)
3832 error ("size of array `%s' is negative", name);
3833 size = integer_one_node;
3838 /* Make sure the array size remains visibly nonconstant
3839 even if it is (eg) a const variable with known value. */
3842 if (!flag_isoc99 && pedantic)
3844 if (TREE_CONSTANT (size))
3845 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3848 pedwarn ("ISO C90 forbids variable-size array `%s'",
3853 if (integer_zerop (size))
3855 /* A zero-length array cannot be represented with an
3856 unsigned index type, which is what we'll get with
3857 build_index_type. Create an open-ended range instead. */
3858 itype = build_range_type (sizetype, size, NULL_TREE);
3862 /* Compute the maximum valid index, that is, size - 1.
3863 Do the calculation in index_type, so that if it is
3864 a variable the computations will be done in the
3866 itype = fold (build (MINUS_EXPR, index_type,
3867 convert (index_type, size),
3868 convert (index_type, size_one_node)));
3870 /* If that overflowed, the array is too big.
3871 ??? While a size of INT_MAX+1 technically shouldn't
3872 cause an overflow (because we subtract 1), the overflow
3873 is recorded during the conversion to index_type, before
3874 the subtraction. Handling this case seems like an
3875 unnecessary complication. */
3876 if (TREE_OVERFLOW (itype))
3878 error ("size of array `%s' is too large", name);
3879 type = error_mark_node;
3885 /* We must be able to distinguish the
3886 SAVE_EXPR_CONTEXT for the variably-sized type
3887 so that we can set it correctly in
3888 set_save_expr_context. The convention is
3889 that all SAVE_EXPRs that need to be reset
3890 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3891 tree cfd = current_function_decl;
3892 if (decl_context == PARM)
3893 current_function_decl = NULL_TREE;
3894 itype = variable_size (itype);
3895 if (decl_context == PARM)
3896 current_function_decl = cfd;
3898 itype = build_index_type (itype);
3901 else if (decl_context == FIELD)
3903 if (pedantic && !flag_isoc99 && !in_system_header)
3904 pedwarn ("ISO C90 does not support flexible array members");
3906 /* ISO C99 Flexible array members are effectively identical
3907 to GCC's zero-length array extension. */
3908 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3911 /* If pedantic, complain about arrays of incomplete types. */
3913 if (pedantic && !COMPLETE_TYPE_P (type))
3914 pedwarn ("array type has incomplete element type");
3917 /* We shouldn't have a function type here at all!
3918 Functions aren't allowed as array elements. */
3919 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
3920 && (constp || volatilep))
3921 pedwarn ("ISO C forbids const or volatile function types");
3924 /* Build the array type itself, then merge any constancy or
3925 volatility into the target type. We must do it in this order
3926 to ensure that the TYPE_MAIN_VARIANT field of the array type
3927 is set correctly. */
3929 type = build_array_type (type, itype);
3931 type = c_build_qualified_type (type, type_quals);
3934 C_TYPE_VARIABLE_SIZE (type) = 1;
3936 /* The GCC extension for zero-length arrays differs from
3937 ISO flexible array members in that sizeof yields zero. */
3938 if (size && integer_zerop (size))
3941 TYPE_SIZE (type) = bitsize_zero_node;
3942 TYPE_SIZE_UNIT (type) = size_zero_node;
3944 if (decl_context != PARM
3945 && (array_ptr_quals != NULL_TREE || array_parm_static))
3947 error ("static or type qualifiers in non-parameter array declarator");
3948 array_ptr_quals = NULL_TREE;
3949 array_parm_static = 0;
3952 else if (TREE_CODE (declarator) == CALL_EXPR)
3956 /* Declaring a function type.
3957 Make sure we have a valid type for the function to return. */
3958 if (type == error_mark_node)
3963 /* Warn about some types functions can't return. */
3965 if (TREE_CODE (type) == FUNCTION_TYPE)
3967 error ("`%s' declared as function returning a function", name);
3968 type = integer_type_node;
3970 if (TREE_CODE (type) == ARRAY_TYPE)
3972 error ("`%s' declared as function returning an array", name);
3973 type = integer_type_node;
3976 /* Construct the function type and go to the next
3977 inner layer of declarator. */
3979 arg_types = grokparms (TREE_OPERAND (declarator, 1),
3981 /* Say it's a definition
3982 only for the CALL_EXPR
3983 closest to the identifier. */
3984 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
3985 /* Type qualifiers before the return type of the function
3986 qualify the return type, not the function type. */
3989 /* Type qualifiers on a function return type are normally
3990 permitted by the standard but have no effect, so give a
3991 warning at -Wextra. Qualifiers on a void return type have
3992 meaning as a GNU extension, and are banned on function
3993 definitions in ISO C. FIXME: strictly we shouldn't
3994 pedwarn for qualified void return types except on function
3995 definitions, but not doing so could lead to the undesirable
3996 state of a "volatile void" function return type not being
3997 warned about, and a use of the function being compiled
3998 with GNU semantics, with no diagnostics under -pedantic. */
3999 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4000 pedwarn ("ISO C forbids qualified void function return type");
4001 else if (extra_warnings
4002 && !(VOID_TYPE_P (type)
4003 && type_quals == TYPE_QUAL_VOLATILE))
4004 warning ("type qualifiers ignored on function return type");
4006 type = c_build_qualified_type (type, type_quals);
4008 type_quals = TYPE_UNQUALIFIED;
4010 type = build_function_type (type, arg_types);
4011 declarator = TREE_OPERAND (declarator, 0);
4013 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4014 the formal parameter list of this FUNCTION_TYPE to point to
4015 the FUNCTION_TYPE node itself. */
4020 for (link = last_function_parm_tags;
4022 link = TREE_CHAIN (link))
4023 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4026 else if (TREE_CODE (declarator) == INDIRECT_REF)
4028 /* Merge any constancy or volatility into the target type
4031 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4033 pedwarn ("ISO C forbids qualified function types");
4035 type = c_build_qualified_type (type, type_quals);
4036 type_quals = TYPE_UNQUALIFIED;
4039 type = build_pointer_type (type);
4041 /* Process a list of type modifier keywords
4042 (such as const or volatile) that were given inside the `*'. */
4044 if (TREE_TYPE (declarator))
4052 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4053 typemodlist = TREE_CHAIN (typemodlist))
4055 tree qualifier = TREE_VALUE (typemodlist);
4057 if (C_IS_RESERVED_WORD (qualifier))
4059 if (C_RID_CODE (qualifier) == RID_CONST)
4061 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4063 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4073 error ("invalid type modifier within pointer declarator");
4074 if (constp > 1 && ! flag_isoc99)
4075 pedwarn ("duplicate `const'");
4076 if (volatilep > 1 && ! flag_isoc99)
4077 pedwarn ("duplicate `volatile'");
4078 if (restrictp > 1 && ! flag_isoc99)
4079 pedwarn ("duplicate `restrict'");
4081 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4082 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4083 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4086 declarator = TREE_OPERAND (declarator, 0);
4093 /* Now TYPE has the actual type. */
4095 /* Did array size calculations overflow? */
4097 if (TREE_CODE (type) == ARRAY_TYPE
4098 && COMPLETE_TYPE_P (type)
4099 && TREE_OVERFLOW (TYPE_SIZE (type)))
4101 error ("size of array `%s' is too large", name);
4102 /* If we proceed with the array type as it is, we'll eventually
4103 crash in tree_low_cst(). */
4104 type = error_mark_node;
4107 /* If this is declaring a typedef name, return a TYPE_DECL. */
4109 if (specbits & (1 << (int) RID_TYPEDEF))
4112 /* Note that the grammar rejects storage classes
4113 in typenames, fields or parameters */
4114 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4116 pedwarn ("ISO C forbids qualified function types");
4118 type = c_build_qualified_type (type, type_quals);
4119 decl = build_decl (TYPE_DECL, declarator, type);
4120 if ((specbits & (1 << (int) RID_SIGNED))
4121 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4122 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4123 decl_attributes (&decl, returned_attrs, 0);
4127 /* Detect the case of an array type of unspecified size
4128 which came, as such, direct from a typedef name.
4129 We must copy the type, so that each identifier gets
4130 a distinct type, so that each identifier's size can be
4131 controlled separately by its own initializer. */
4133 if (type != 0 && typedef_type != 0
4134 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4135 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4137 type = build_array_type (TREE_TYPE (type), 0);
4139 C_TYPE_VARIABLE_SIZE (type) = 1;
4142 /* If this is a type name (such as, in a cast or sizeof),
4143 compute the type and return it now. */
4145 if (decl_context == TYPENAME)
4147 /* Note that the grammar rejects storage classes
4148 in typenames, fields or parameters */
4149 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4151 pedwarn ("ISO C forbids const or volatile function types");
4153 type = c_build_qualified_type (type, type_quals);
4154 decl_attributes (&type, returned_attrs, 0);
4158 /* Aside from typedefs and type names (handle above),
4159 `void' at top level (not within pointer)
4160 is allowed only in public variables.
4161 We don't complain about parms either, but that is because
4162 a better error message can be made later. */
4164 if (VOID_TYPE_P (type) && decl_context != PARM
4165 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4166 && ((specbits & (1 << (int) RID_EXTERN))
4167 || (current_binding_level == global_binding_level
4169 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4171 error ("variable or field `%s' declared void", name);
4172 type = integer_type_node;
4175 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4176 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4181 if (decl_context == PARM)
4183 tree type_as_written;
4186 /* A parameter declared as an array of T is really a pointer to T.
4187 One declared as a function is really a pointer to a function. */
4189 if (TREE_CODE (type) == ARRAY_TYPE)
4191 /* Transfer const-ness of array into that of type pointed to. */
4192 type = TREE_TYPE (type);
4194 type = c_build_qualified_type (type, type_quals);
4195 type = build_pointer_type (type);
4196 type_quals = TYPE_UNQUALIFIED;
4197 if (array_ptr_quals)
4199 tree new_ptr_quals, new_ptr_attrs;
4201 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4202 /* We don't yet implement attributes in this context. */
4203 if (new_ptr_attrs != NULL_TREE)
4204 warning ("attributes in parameter array declarator ignored");
4209 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4211 tree qualifier = TREE_VALUE (new_ptr_quals);
4213 if (C_IS_RESERVED_WORD (qualifier))
4215 if (C_RID_CODE (qualifier) == RID_CONST)
4217 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4219 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4229 error ("invalid type modifier within array declarator");
4231 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4232 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4233 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4237 else if (TREE_CODE (type) == FUNCTION_TYPE)
4239 if (pedantic && type_quals)
4240 pedwarn ("ISO C forbids qualified function types");
4242 type = c_build_qualified_type (type, type_quals);
4243 type = build_pointer_type (type);
4244 type_quals = TYPE_UNQUALIFIED;
4246 else if (type_quals)
4247 type = c_build_qualified_type (type, type_quals);
4249 type_as_written = type;
4251 decl = build_decl (PARM_DECL, declarator, type);
4253 C_DECL_VARIABLE_SIZE (decl) = 1;
4255 /* Compute the type actually passed in the parmlist,
4256 for the case where there is no prototype.
4257 (For example, shorts and chars are passed as ints.)
4258 When there is a prototype, this is overridden later. */
4260 if (type == error_mark_node)
4261 promoted_type = type;
4263 promoted_type = c_type_promotes_to (type);
4265 DECL_ARG_TYPE (decl) = promoted_type;
4266 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4268 else if (decl_context == FIELD)
4270 /* Structure field. It may not be a function. */
4272 if (TREE_CODE (type) == FUNCTION_TYPE)
4274 error ("field `%s' declared as a function", name);
4275 type = build_pointer_type (type);
4277 else if (TREE_CODE (type) != ERROR_MARK
4278 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4280 error ("field `%s' has incomplete type", name);
4281 type = error_mark_node;
4283 /* Move type qualifiers down to element of an array. */
4284 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4286 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4288 TYPE_DOMAIN (type));
4290 /* Leave the field const or volatile as well. */
4291 type_quals = TYPE_UNQUALIFIED;
4294 decl = build_decl (FIELD_DECL, declarator, type);
4295 DECL_NONADDRESSABLE_P (decl) = bitfield;
4298 C_DECL_VARIABLE_SIZE (decl) = 1;
4300 else if (TREE_CODE (type) == FUNCTION_TYPE)
4302 /* Every function declaration is "external"
4303 except for those which are inside a function body
4304 in which `auto' is used.
4305 That is a case not specified by ANSI C,
4306 and we use it for forward declarations for nested functions. */
4307 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4308 || current_binding_level == global_binding_level);
4310 if (specbits & (1 << (int) RID_AUTO)
4311 && (pedantic || current_binding_level == global_binding_level))
4312 pedwarn ("invalid storage class for function `%s'", name);
4313 if (specbits & (1 << (int) RID_REGISTER))
4314 error ("invalid storage class for function `%s'", name);
4315 if (specbits & (1 << (int) RID_THREAD))
4316 error ("invalid storage class for function `%s'", name);
4317 /* Function declaration not at top level.
4318 Storage classes other than `extern' are not allowed
4319 and `extern' makes no difference. */
4320 if (current_binding_level != global_binding_level
4321 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4323 pedwarn ("invalid storage class for function `%s'", name);
4325 decl = build_decl (FUNCTION_DECL, declarator, type);
4326 decl = build_decl_attribute_variant (decl, decl_attr);
4328 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4329 ggc_alloc_cleared (sizeof (struct lang_decl));
4331 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4332 pedwarn ("ISO C forbids qualified function types");
4334 /* GNU C interprets a `volatile void' return type to indicate
4335 that the function does not return. */
4336 if ((type_quals & TYPE_QUAL_VOLATILE)
4337 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4338 warning ("`noreturn' function returns non-void value");
4341 DECL_EXTERNAL (decl) = 1;
4342 /* Record absence of global scope for `static' or `auto'. */
4344 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4347 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4349 /* Record presence of `inline', if it is reasonable. */
4350 if (MAIN_NAME_P (declarator))
4353 warning ("cannot inline function `main'");
4357 /* Assume that otherwise the function can be inlined. */
4358 DECL_DECLARED_INLINE_P (decl) = 1;
4360 /* Do not mark bare declarations as DECL_INLINE. Doing so
4361 in the presence of multiple declarations can result in
4362 the abstract origin pointing between the declarations,
4363 which will confuse dwarf2out. */
4366 DECL_INLINE (decl) = 1;
4367 if (specbits & (1 << (int) RID_EXTERN))
4368 current_extern_inline = 1;
4371 /* If -finline-functions, assume it can be inlined. This does
4372 two things: let the function be deferred until it is actually
4373 needed, and let dwarf2 know that the function is inlinable. */
4374 else if (flag_inline_trees == 2 && initialized)
4376 if (!DECL_INLINE (decl))
4377 DID_INLINE_FUNC (decl) = 1;
4378 DECL_INLINE (decl) = 1;
4379 DECL_DECLARED_INLINE_P (decl) = 0;
4384 /* It's a variable. */
4385 /* An uninitialized decl with `extern' is a reference. */
4386 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4388 /* Move type qualifiers down to element of an array. */
4389 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4391 int saved_align = TYPE_ALIGN(type);
4392 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4394 TYPE_DOMAIN (type));
4395 TYPE_ALIGN (type) = saved_align;
4396 #if 0 /* Leave the variable const or volatile as well. */
4397 type_quals = TYPE_UNQUALIFIED;
4400 else if (type_quals)
4401 type = c_build_qualified_type (type, type_quals);
4403 /* It is invalid to create an `extern' declaration for a
4404 variable if there is a global declaration that is
4406 if (extern_ref && current_binding_level != global_binding_level)
4410 global_decl = identifier_global_value (declarator);
4412 && TREE_CODE (global_decl) == VAR_DECL
4413 && !TREE_PUBLIC (global_decl))
4414 error ("variable previously declared `static' redeclared "
4418 decl = build_decl (VAR_DECL, declarator, type);
4420 C_DECL_VARIABLE_SIZE (decl) = 1;
4423 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4425 DECL_EXTERNAL (decl) = extern_ref;
4427 /* At top level, the presence of a `static' or `register' storage
4428 class specifier, or the absence of all storage class specifiers
4429 makes this declaration a definition (perhaps tentative). Also,
4430 the absence of both `static' and `register' makes it public. */
4431 if (current_binding_level == global_binding_level)
4433 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4434 | (1 << (int) RID_REGISTER)));
4435 TREE_STATIC (decl) = !extern_ref;
4437 /* Not at top level, only `static' makes a static definition. */
4440 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4441 TREE_PUBLIC (decl) = extern_ref;
4444 if (specbits & 1 << (int) RID_THREAD)
4446 if (targetm.have_tls)
4447 DECL_THREAD_LOCAL (decl) = 1;
4449 /* A mere warning is sure to result in improper semantics
4450 at runtime. Don't bother to allow this to compile. */
4451 error ("thread-local storage not supported for this target");
4455 /* Record `register' declaration for warnings on &
4456 and in case doing stupid register allocation. */
4458 if (specbits & (1 << (int) RID_REGISTER))
4459 DECL_REGISTER (decl) = 1;
4461 /* Record constancy and volatility. */
4462 c_apply_type_quals_to_decl (type_quals, decl);
4464 /* If a type has volatile components, it should be stored in memory.
4465 Otherwise, the fact that those components are volatile
4466 will be ignored, and would even crash the compiler. */
4467 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4468 c_mark_addressable (decl);
4470 decl_attributes (&decl, returned_attrs, 0);
4476 /* Decode the parameter-list info for a function type or function definition.
4477 The argument is the value returned by `get_parm_info' (or made in parse.y
4478 if there is an identifier list instead of a parameter decl list).
4479 These two functions are separate because when a function returns
4480 or receives functions then each is called multiple times but the order
4481 of calls is different. The last call to `grokparms' is always the one
4482 that contains the formal parameter names of a function definition.
4484 Store in `last_function_parms' a chain of the decls of parms.
4485 Also store in `last_function_parm_tags' a chain of the struct, union,
4486 and enum tags declared among the parms.
4488 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4490 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4491 a mere declaration. A nonempty identifier-list gets an error message
4492 when FUNCDEF_FLAG is zero. */
4495 grokparms (parms_info, funcdef_flag)
4499 tree first_parm = TREE_CHAIN (parms_info);
4501 last_function_parms = TREE_PURPOSE (parms_info);
4502 last_function_parm_tags = TREE_VALUE (parms_info);
4504 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4505 && !in_system_header)
4506 warning ("function declaration isn't a prototype");
4509 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4512 pedwarn ("parameter names (without types) in function declaration");
4514 last_function_parms = first_parm;
4521 /* We no longer test FUNCDEF_FLAG.
4522 If the arg types are incomplete in a declaration,
4523 they must include undefined tags.
4524 These tags can never be defined in the scope of the declaration,
4525 so the types can never be completed,
4526 and no call can be compiled successfully. */
4528 /* In a fcn definition, arg types must be complete. */
4531 for (parm = last_function_parms, typelt = first_parm;
4533 parm = TREE_CHAIN (parm))
4534 /* Skip over any enumeration constants declared here. */
4535 if (TREE_CODE (parm) == PARM_DECL)
4537 /* Barf if the parameter itself has an incomplete type. */
4538 tree type = TREE_VALUE (typelt);
4539 if (type == error_mark_node)
4541 if (!COMPLETE_TYPE_P (type))
4543 if (funcdef_flag && DECL_NAME (parm) != 0)
4544 error ("parameter `%s' has incomplete type",
4545 IDENTIFIER_POINTER (DECL_NAME (parm)));
4547 warning ("parameter has incomplete type");
4550 TREE_VALUE (typelt) = error_mark_node;
4551 TREE_TYPE (parm) = error_mark_node;
4555 /* This has been replaced by parm_tags_warning, which
4556 uses a more accurate criterion for what to warn
4560 /* Now warn if is a pointer to an incomplete type. */
4561 while (TREE_CODE (type) == POINTER_TYPE
4562 || TREE_CODE (type) == REFERENCE_TYPE)
4563 type = TREE_TYPE (type);
4564 type = TYPE_MAIN_VARIANT (type);
4565 if (!COMPLETE_TYPE_P (type))
4567 if (DECL_NAME (parm) != 0)
4568 warning ("parameter `%s' points to incomplete type",
4569 IDENTIFIER_POINTER (DECL_NAME (parm)));
4571 warning ("parameter points to incomplete type");
4575 typelt = TREE_CHAIN (typelt);
4582 /* Return a tree_list node with info on a parameter list just parsed.
4583 The TREE_PURPOSE is a chain of decls of those parms.
4584 The TREE_VALUE is a list of structure, union and enum tags defined.
4585 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4586 This tree_list node is later fed to `grokparms'.
4588 VOID_AT_END nonzero means append `void' to the end of the type-list.
4589 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4592 get_parm_info (void_at_end)
4598 tree tags = gettags ();
4599 tree parms = getdecls ();
4601 tree order = current_binding_level->parm_order;
4603 /* Just `void' (and no ellipsis) is special. There are really no parms.
4604 But if the `void' is qualified (by `const' or `volatile') or has a
4605 storage class specifier (`register'), then the behavior is undefined;
4606 by not counting it as the special case of `void' we will cause an
4607 error later. Typedefs for `void' are OK (see DR#157). */
4608 if (void_at_end && parms != 0
4609 && TREE_CHAIN (parms) == 0
4610 && VOID_TYPE_P (TREE_TYPE (parms))
4611 && ! TREE_THIS_VOLATILE (parms)
4612 && ! TREE_READONLY (parms)
4613 && ! DECL_REGISTER (parms)
4614 && DECL_NAME (parms) == 0)
4617 storedecls (NULL_TREE);
4618 return tree_cons (NULL_TREE, NULL_TREE,
4619 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4622 /* Extract enumerator values and other non-parms declared with the parms.
4623 Likewise any forward parm decls that didn't have real parm decls. */
4624 for (decl = parms; decl;)
4626 tree next = TREE_CHAIN (decl);
4628 if (TREE_CODE (decl) != PARM_DECL)
4630 TREE_CHAIN (decl) = new_parms;
4633 else if (TREE_ASM_WRITTEN (decl))
4635 error_with_decl (decl,
4636 "parameter `%s' has just a forward declaration");
4637 TREE_CHAIN (decl) = new_parms;
4643 /* Put the parm decls back in the order they were in in the parm list. */
4644 for (t = order; t; t = TREE_CHAIN (t))
4647 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4649 TREE_CHAIN (TREE_VALUE (t)) = 0;
4652 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4655 /* Store the parmlist in the binding level since the old one
4656 is no longer a valid list. (We have changed the chain pointers.) */
4657 storedecls (new_parms);
4659 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4660 /* There may also be declarations for enumerators if an enumeration
4661 type is declared among the parms. Ignore them here. */
4662 if (TREE_CODE (decl) == PARM_DECL)
4664 /* Since there is a prototype,
4665 args are passed in their declared types. */
4666 tree type = TREE_TYPE (decl);
4667 DECL_ARG_TYPE (decl) = type;
4668 if (PROMOTE_PROTOTYPES
4669 && INTEGRAL_TYPE_P (type)
4670 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4671 DECL_ARG_TYPE (decl) = integer_type_node;
4673 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4674 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
4675 && DECL_NAME (decl) == 0)
4677 error ("`void' in parameter list must be the entire list");
4683 return tree_cons (new_parms, tags,
4684 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
4686 return tree_cons (new_parms, tags, nreverse (types));
4689 /* At end of parameter list, warn about any struct, union or enum tags
4690 defined within. Do so because these types cannot ever become complete. */
4693 parmlist_tags_warning ()
4698 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4700 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4701 /* An anonymous union parm type is meaningful as a GNU extension.
4702 So don't warn for that. */
4703 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
4705 if (TREE_PURPOSE (elt) != 0)
4707 if (code == RECORD_TYPE)
4708 warning ("`struct %s' declared inside parameter list",
4709 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4710 else if (code == UNION_TYPE)
4711 warning ("`union %s' declared inside parameter list",
4712 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4714 warning ("`enum %s' declared inside parameter list",
4715 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4719 /* For translation these need to be separate warnings */
4720 if (code == RECORD_TYPE)
4721 warning ("anonymous struct declared inside parameter list");
4722 else if (code == UNION_TYPE)
4723 warning ("anonymous union declared inside parameter list");
4725 warning ("anonymous enum declared inside parameter list");
4729 warning ("its scope is only this definition or declaration, which is probably not what you want");
4735 /* Get the struct, enum or union (CODE says which) with tag NAME.
4736 Define the tag as a forward-reference if it is not defined. */
4739 xref_tag (code, name)
4740 enum tree_code code;
4743 /* If a cross reference is requested, look up the type
4744 already defined for this tag and return it. */
4746 tree ref = lookup_tag (code, name, 0);
4747 /* If this is the right type of tag, return what we found.
4748 (This reference will be shadowed by shadow_tag later if appropriate.)
4749 If this is the wrong type of tag, do not return it. If it was the
4750 wrong type in the same binding level, we will have had an error
4751 message already; if in a different binding level and declaring
4752 a name, pending_xref_error will give an error message; but if in a
4753 different binding level and not declaring a name, this tag should
4754 shadow the previous declaration of a different type of tag, and
4755 this would not work properly if we return the reference found.
4756 (For example, with "struct foo" in an outer scope, "union foo;"
4757 must shadow that tag with a new one of union type.) */
4758 if (ref && TREE_CODE (ref) == code)
4761 /* If no such tag is yet defined, create a forward-reference node
4762 and record it as the "definition".
4763 When a real declaration of this type is found,
4764 the forward-reference will be altered into a real type. */
4766 ref = make_node (code);
4767 if (code == ENUMERAL_TYPE)
4769 /* Give the type a default layout like unsigned int
4770 to avoid crashing if it does not get defined. */
4771 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4772 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4773 TYPE_USER_ALIGN (ref) = 0;
4774 TREE_UNSIGNED (ref) = 1;
4775 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4776 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4777 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4780 pushtag (name, ref);
4785 /* Make sure that the tag NAME is defined *in the current binding level*
4786 at least as a forward reference.
4787 CODE says which kind of tag NAME ought to be. */
4790 start_struct (code, name)
4791 enum tree_code code;
4794 /* If there is already a tag defined at this binding level
4795 (as a forward reference), just return it. */
4800 ref = lookup_tag (code, name, 1);
4801 if (ref && TREE_CODE (ref) == code)
4803 if (TYPE_FIELDS (ref))
4805 if (code == UNION_TYPE)
4806 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4808 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4813 /* Otherwise create a forward-reference just so the tag is in scope. */
4815 ref = make_node (code);
4816 pushtag (name, ref);
4819 C_TYPE_BEING_DEFINED (ref) = 1;
4820 TYPE_PACKED (ref) = flag_pack_struct;
4824 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4825 of a structure component, returning a FIELD_DECL node.
4826 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4828 This is done during the parsing of the struct declaration.
4829 The FIELD_DECL nodes are chained together and the lot of them
4830 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4833 grokfield (filename, line, declarator, declspecs, width)
4834 const char *filename ATTRIBUTE_UNUSED;
4835 int line ATTRIBUTE_UNUSED;
4836 tree declarator, declspecs, width;
4840 if (declarator == NULL_TREE && width == NULL_TREE)
4842 /* This is an unnamed decl.
4844 If we have something of the form "union { list } ;" then this
4845 is the anonymous union extension. Similarly for struct.
4847 If this is something of the form "struct foo;", then
4848 If MS extensions are enabled, this is handled as an
4850 Otherwise this is a forward declaration of a structure tag.
4852 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4853 If MS extensions are enabled and foo names a structure, then
4854 again this is an anonymous struct.
4855 Otherwise this is an error.
4857 Oh what a horrid tangled web we weave. I wonder if MS consciously
4858 took this from Plan 9 or if it was an accident of implementation
4859 that took root before someone noticed the bug... */
4861 tree type = TREE_VALUE (declspecs);
4863 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4864 type = TREE_TYPE (type);
4865 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4867 if (flag_ms_extensions)
4870 goto warn_unnamed_field;
4871 else if (TYPE_NAME (type) == NULL)
4874 goto warn_unnamed_field;
4879 warning ("declaration does not declare anything");
4884 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4886 finish_decl (value, NULL_TREE, NULL_TREE);
4887 DECL_INITIAL (value) = width;
4890 objc_check_decl (value);
4894 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4895 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4896 ATTRIBUTES are attributes to be applied to the structure. */
4899 finish_struct (t, fieldlist, attributes)
4905 int toplevel = global_binding_level == current_binding_level;
4906 int saw_named_field;
4908 /* If this type was previously laid out as a forward reference,
4909 make sure we lay it out again. */
4913 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4915 /* Nameless union parm types are useful as GCC extension. */
4916 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4917 /* Otherwise, warn about any struct or union def. in parmlist. */
4918 if (in_parm_level_p ())
4921 pedwarn ("%s defined inside parms",
4922 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4924 warning ("%s defined inside parms",
4925 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4930 for (x = fieldlist; x; x = TREE_CHAIN (x))
4931 if (DECL_NAME (x) != 0)
4935 pedwarn ("%s has no %s",
4936 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4937 fieldlist ? _("named members") : _("members"));
4940 /* Install struct as DECL_CONTEXT of each field decl.
4941 Also process specified field sizes,m which is found in the DECL_INITIAL.
4942 Store 0 there, except for ": 0" fields (so we can find them
4943 and delete them, below). */
4945 saw_named_field = 0;
4946 for (x = fieldlist; x; x = TREE_CHAIN (x))
4948 DECL_CONTEXT (x) = t;
4949 DECL_PACKED (x) |= TYPE_PACKED (t);
4951 /* If any field is const, the structure type is pseudo-const. */
4952 if (TREE_READONLY (x))
4953 C_TYPE_FIELDS_READONLY (t) = 1;
4956 /* A field that is pseudo-const makes the structure likewise. */
4957 tree t1 = TREE_TYPE (x);
4958 while (TREE_CODE (t1) == ARRAY_TYPE)
4959 t1 = TREE_TYPE (t1);
4960 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4961 && C_TYPE_FIELDS_READONLY (t1))
4962 C_TYPE_FIELDS_READONLY (t) = 1;
4965 /* Any field that is volatile means variables of this type must be
4966 treated in some ways as volatile. */
4967 if (TREE_THIS_VOLATILE (x))
4968 C_TYPE_FIELDS_VOLATILE (t) = 1;
4970 /* Any field of nominal variable size implies structure is too. */
4971 if (C_DECL_VARIABLE_SIZE (x))
4972 C_TYPE_VARIABLE_SIZE (t) = 1;
4974 /* Detect invalid nested redefinition. */
4975 if (TREE_TYPE (x) == t)
4976 error ("nested redefinition of `%s'",
4977 IDENTIFIER_POINTER (TYPE_NAME (t)));
4979 /* Detect invalid bit-field size. */
4980 if (DECL_INITIAL (x))
4981 STRIP_NOPS (DECL_INITIAL (x));
4982 if (DECL_INITIAL (x))
4984 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
4985 constant_expression_warning (DECL_INITIAL (x));
4989 "bit-field `%s' width not an integer constant");
4990 DECL_INITIAL (x) = NULL;
4994 /* Detect invalid bit-field type. */
4995 if (DECL_INITIAL (x)
4996 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
4997 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
4998 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5000 error_with_decl (x, "bit-field `%s' has invalid type");
5001 DECL_INITIAL (x) = NULL;
5004 if (DECL_INITIAL (x) && pedantic
5005 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5006 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5007 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5008 /* Accept an enum that's equivalent to int or unsigned int. */
5009 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5010 && (TYPE_PRECISION (TREE_TYPE (x))
5011 == TYPE_PRECISION (integer_type_node))))
5012 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5014 /* Detect and ignore out of range field width and process valid
5016 if (DECL_INITIAL (x))
5019 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
5020 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5022 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5023 error_with_decl (x, "negative width in bit-field `%s'");
5024 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5025 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5026 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5027 error_with_decl (x, "zero width for bit-field `%s'");
5030 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5031 unsigned HOST_WIDE_INT width
5032 = tree_low_cst (DECL_INITIAL (x), 1);
5034 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5035 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5036 TREE_UNSIGNED (TREE_TYPE (x)))
5038 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5039 TREE_UNSIGNED (TREE_TYPE (x))))))
5040 warning_with_decl (x,
5041 "`%s' is narrower than values of its type");
5043 DECL_SIZE (x) = bitsize_int (width);
5044 DECL_BIT_FIELD (x) = 1;
5045 SET_DECL_C_BIT_FIELD (x);
5049 DECL_INITIAL (x) = 0;
5051 /* Detect flexible array member in an invalid context. */
5052 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5053 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5054 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5055 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5057 if (TREE_CODE (t) == UNION_TYPE)
5058 error_with_decl (x, "flexible array member in union");
5059 else if (TREE_CHAIN (x) != NULL_TREE)
5060 error_with_decl (x, "flexible array member not at end of struct");
5061 else if (! saw_named_field)
5062 error_with_decl (x, "flexible array member in otherwise empty struct");
5065 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5066 && flexible_array_type_p (TREE_TYPE (x)))
5067 pedwarn_with_decl (x, "invalid use of structure with flexible array member");
5070 saw_named_field = 1;
5073 /* Delete all duplicate fields from the fieldlist */
5074 for (x = fieldlist; x && TREE_CHAIN (x);)
5075 /* Anonymous fields aren't duplicates. */
5076 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5084 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5090 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5092 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5093 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5099 /* Now we have the nearly final fieldlist. Record it,
5100 then lay out the structure or union (including the fields). */
5102 TYPE_FIELDS (t) = fieldlist;
5106 /* Delete all zero-width bit-fields from the fieldlist */
5108 tree *fieldlistp = &fieldlist;
5110 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5111 *fieldlistp = TREE_CHAIN (*fieldlistp);
5113 fieldlistp = &TREE_CHAIN (*fieldlistp);
5116 /* Now we have the truly final field list.
5117 Store it in this type and in the variants. */
5119 TYPE_FIELDS (t) = fieldlist;
5121 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5123 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5124 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5125 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5126 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5129 /* If this was supposed to be a transparent union, but we can't
5130 make it one, warn and turn off the flag. */
5131 if (TREE_CODE (t) == UNION_TYPE
5132 && TYPE_TRANSPARENT_UNION (t)
5133 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5135 TYPE_TRANSPARENT_UNION (t) = 0;
5136 warning ("union cannot be made transparent");
5139 /* If this structure or union completes the type of any previous
5140 variable declaration, lay it out and output its rtl. */
5142 if (current_binding_level->incomplete_list != NULL_TREE)
5144 tree prev = NULL_TREE;
5146 for (x = current_binding_level->incomplete_list; x; x = TREE_CHAIN (x))
5148 tree decl = TREE_VALUE (x);
5150 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5151 && TREE_CODE (decl) != TYPE_DECL)
5153 layout_decl (decl, 0);
5154 /* This is a no-op in c-lang.c or something real in objc-act.c. */
5156 objc_check_decl (decl);
5157 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5160 /* Unlink X from the incomplete list. */
5162 TREE_CHAIN (prev) = TREE_CHAIN (x);
5164 current_binding_level->incomplete_list = TREE_CHAIN (x);
5166 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5167 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5169 tree element = TREE_TYPE (decl);
5170 while (TREE_CODE (element) == ARRAY_TYPE)
5171 element = TREE_TYPE (element);
5174 layout_array_type (TREE_TYPE (decl));
5175 if (TREE_CODE (decl) != TYPE_DECL)
5177 layout_decl (decl, 0);
5179 objc_check_decl (decl);
5180 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5184 /* Unlink X from the incomplete list. */
5186 TREE_CHAIN (prev) = TREE_CHAIN (x);
5188 current_binding_level->incomplete_list = TREE_CHAIN (x);
5194 /* Finish debugging output for this type. */
5195 rest_of_type_compilation (t, toplevel);
5200 /* Lay out the type T, and its element type, and so on. */
5203 layout_array_type (t)
5206 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5207 layout_array_type (TREE_TYPE (t));
5211 /* Begin compiling the definition of an enumeration type.
5212 NAME is its name (or null if anonymous).
5213 Returns the type object, as yet incomplete.
5214 Also records info about it so that build_enumerator
5215 may be used to declare the individual values as they are read. */
5223 /* If this is the real definition for a previous forward reference,
5224 fill in the contents in the same object that used to be the
5225 forward reference. */
5228 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5230 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5232 enumtype = make_node (ENUMERAL_TYPE);
5233 pushtag (name, enumtype);
5236 C_TYPE_BEING_DEFINED (enumtype) = 1;
5238 if (TYPE_VALUES (enumtype) != 0)
5240 /* This enum is a named one that has been declared already. */
5241 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5243 /* Completely replace its old definition.
5244 The old enumerators remain defined, however. */
5245 TYPE_VALUES (enumtype) = 0;
5248 enum_next_value = integer_zero_node;
5251 if (flag_short_enums)
5252 TYPE_PACKED (enumtype) = 1;
5257 /* After processing and defining all the values of an enumeration type,
5258 install their decls in the enumeration type and finish it off.
5259 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5260 and ATTRIBUTES are the specified attributes.
5261 Returns ENUMTYPE. */
5264 finish_enum (enumtype, values, attributes)
5270 tree minnode = 0, maxnode = 0, enum_value_type;
5271 int precision, unsign;
5272 int toplevel = (global_binding_level == current_binding_level);
5274 if (in_parm_level_p ())
5275 warning ("enum defined inside parms");
5277 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5279 /* Calculate the maximum value of any enumerator in this type. */
5281 if (values == error_mark_node)
5282 minnode = maxnode = integer_zero_node;
5285 minnode = maxnode = TREE_VALUE (values);
5286 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5288 tree value = TREE_VALUE (pair);
5289 if (tree_int_cst_lt (maxnode, value))
5291 if (tree_int_cst_lt (value, minnode))
5296 /* Construct the final type of this enumeration. It is the same
5297 as one of the integral types - the narrowest one that fits, except
5298 that normally we only go as narrow as int - and signed iff any of
5299 the values are negative. */
5300 unsign = (tree_int_cst_sgn (minnode) >= 0);
5301 precision = MAX (min_precision (minnode, unsign),
5302 min_precision (maxnode, unsign));
5303 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5305 tree narrowest = c_common_type_for_size (precision, unsign);
5308 warning ("enumeration values exceed range of largest integer");
5309 narrowest = long_long_integer_type_node;
5312 precision = TYPE_PRECISION (narrowest);
5315 precision = TYPE_PRECISION (integer_type_node);
5317 if (precision == TYPE_PRECISION (integer_type_node))
5318 enum_value_type = c_common_type_for_size (precision, 0);
5320 enum_value_type = enumtype;
5322 TYPE_MIN_VALUE (enumtype) = minnode;
5323 TYPE_MAX_VALUE (enumtype) = maxnode;
5324 TYPE_PRECISION (enumtype) = precision;
5325 TREE_UNSIGNED (enumtype) = unsign;
5326 TYPE_SIZE (enumtype) = 0;
5327 layout_type (enumtype);
5329 if (values != error_mark_node)
5331 /* Change the type of the enumerators to be the enum type. We
5332 need to do this irrespective of the size of the enum, for
5333 proper type checking. Replace the DECL_INITIALs of the
5334 enumerators, and the value slots of the list, with copies
5335 that have the enum type; they cannot be modified in place
5336 because they may be shared (e.g. integer_zero_node) Finally,
5337 change the purpose slots to point to the names of the decls. */
5338 for (pair = values; pair; pair = TREE_CHAIN (pair))
5340 tree enu = TREE_PURPOSE (pair);
5342 TREE_TYPE (enu) = enumtype;
5344 /* The ISO C Standard mandates enumerators to have type int,
5345 even though the underlying type of an enum type is
5346 unspecified. Here we convert any enumerators that fit in
5347 an int to type int, to avoid promotions to unsigned types
5348 when comparing integers with enumerators that fit in the
5349 int range. When -pedantic is given, build_enumerator()
5350 would have already taken care of those that don't fit. */
5351 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5352 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5354 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5356 TREE_PURPOSE (pair) = DECL_NAME (enu);
5357 TREE_VALUE (pair) = DECL_INITIAL (enu);
5360 TYPE_VALUES (enumtype) = values;
5363 /* Fix up all variant types of this enum type. */
5364 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5366 if (tem == enumtype)
5368 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5369 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5370 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5371 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5372 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5373 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5374 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5375 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5376 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5377 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5380 /* Finish debugging output for this type. */
5381 rest_of_type_compilation (enumtype, toplevel);
5386 /* Build and install a CONST_DECL for one value of the
5387 current enumeration type (one that was begun with start_enum).
5388 Return a tree-list containing the CONST_DECL and its value.
5389 Assignment of sequential values by default is handled here. */
5392 build_enumerator (name, value)
5397 /* Validate and default VALUE. */
5399 /* Remove no-op casts from the value. */
5401 STRIP_TYPE_NOPS (value);
5405 if (TREE_CODE (value) == INTEGER_CST)
5407 value = default_conversion (value);
5408 constant_expression_warning (value);
5412 error ("enumerator value for `%s' not integer constant",
5413 IDENTIFIER_POINTER (name));
5418 /* Default based on previous value. */
5419 /* It should no longer be possible to have NON_LVALUE_EXPR
5423 value = enum_next_value;
5425 error ("overflow in enumeration values");
5428 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5430 pedwarn ("ISO C restricts enumerator values to range of `int'");
5431 value = convert (integer_type_node, value);
5434 /* Set basis for default for next value. */
5435 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5436 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5438 /* Now create a declaration for the enum value name. */
5440 type = TREE_TYPE (value);
5441 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5442 TYPE_PRECISION (integer_type_node)),
5443 (TYPE_PRECISION (type)
5444 >= TYPE_PRECISION (integer_type_node)
5445 && TREE_UNSIGNED (type)));
5447 decl = build_decl (CONST_DECL, name, type);
5448 DECL_INITIAL (decl) = convert (type, value);
5451 return tree_cons (decl, value, NULL_TREE);
5455 /* Create the FUNCTION_DECL for a function definition.
5456 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5457 the declaration; they describe the function's name and the type it returns,
5458 but twisted together in a fashion that parallels the syntax of C.
5460 This function creates a binding context for the function body
5461 as well as setting up the FUNCTION_DECL in current_function_decl.
5463 Returns 1 on success. If the DECLARATOR is not suitable for a function
5464 (it defines a datum instead), we return 0, which tells
5465 yyparse to report a parse error. */
5468 start_function (declspecs, declarator, attributes)
5469 tree declarator, declspecs, attributes;
5471 tree decl1, old_decl;
5473 int old_immediate_size_expand = immediate_size_expand;
5475 current_function_returns_value = 0; /* Assume, until we see it does. */
5476 current_function_returns_null = 0;
5477 current_function_returns_abnormally = 0;
5478 warn_about_return_type = 0;
5479 current_extern_inline = 0;
5481 shadowed_labels = 0;
5483 /* Don't expand any sizes in the return type of the function. */
5484 immediate_size_expand = 0;
5486 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5488 /* If the declarator is not suitable for a function definition,
5489 cause a syntax error. */
5492 immediate_size_expand = old_immediate_size_expand;
5496 decl_attributes (&decl1, attributes, 0);
5498 /* If #pragma weak was used, mark the decl weak now. */
5499 if (current_binding_level == global_binding_level)
5500 maybe_apply_pragma_weak (decl1);
5502 if (DECL_DECLARED_INLINE_P (decl1)
5503 && DECL_UNINLINABLE (decl1)
5504 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5505 warning_with_decl (decl1,
5506 "inline function `%s' given attribute noinline");
5508 announce_function (decl1);
5510 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5512 error ("return type is an incomplete type");
5513 /* Make it return void instead. */
5515 = build_function_type (void_type_node,
5516 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5519 if (warn_about_return_type)
5520 pedwarn_c99 ("return type defaults to `int'");
5522 /* Save the parm names or decls from this function's declarator
5523 where store_parm_decls will find them. */
5524 current_function_parms = last_function_parms;
5525 current_function_parm_tags = last_function_parm_tags;
5527 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5528 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5529 DECL_INITIAL (decl1) = error_mark_node;
5531 /* If this definition isn't a prototype and we had a prototype declaration
5532 before, copy the arg type info from that prototype.
5533 But not if what we had before was a builtin function. */
5534 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5535 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5536 && !DECL_BUILT_IN (old_decl)
5537 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5538 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5539 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5541 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5542 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5543 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5546 /* Optionally warn of old-fashioned def with no previous prototype. */
5547 if (warn_strict_prototypes
5548 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5549 && C_DECL_ISNT_PROTOTYPE (old_decl))
5550 warning ("function declaration isn't a prototype");
5551 /* Optionally warn of any global def with no previous prototype. */
5552 else if (warn_missing_prototypes
5553 && TREE_PUBLIC (decl1)
5554 && ! MAIN_NAME_P (DECL_NAME (decl1))
5555 && C_DECL_ISNT_PROTOTYPE (old_decl))
5556 warning_with_decl (decl1, "no previous prototype for `%s'");
5557 /* Optionally warn of any def with no previous prototype
5558 if the function has already been used. */
5559 else if (warn_missing_prototypes
5560 && old_decl != 0 && TREE_USED (old_decl)
5561 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5562 warning_with_decl (decl1,
5563 "`%s' was used with no prototype before its definition");
5564 /* Optionally warn of any global def with no previous declaration. */
5565 else if (warn_missing_declarations
5566 && TREE_PUBLIC (decl1)
5568 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5569 warning_with_decl (decl1, "no previous declaration for `%s'");
5570 /* Optionally warn of any def with no previous declaration
5571 if the function has already been used. */
5572 else if (warn_missing_declarations
5573 && old_decl != 0 && TREE_USED (old_decl)
5574 && C_DECL_IMPLICIT (old_decl))
5575 warning_with_decl (decl1,
5576 "`%s' was used with no declaration before its definition");
5578 /* This is a definition, not a reference.
5579 So normally clear DECL_EXTERNAL.
5580 However, `extern inline' acts like a declaration
5581 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5582 DECL_EXTERNAL (decl1) = current_extern_inline;
5584 /* This function exists in static storage.
5585 (This does not mean `static' in the C sense!) */
5586 TREE_STATIC (decl1) = 1;
5588 /* A nested function is not global. */
5589 if (current_function_decl != 0)
5590 TREE_PUBLIC (decl1) = 0;
5592 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5593 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5598 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5599 != integer_type_node)
5600 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5602 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5603 args = TREE_CHAIN (args))
5605 tree type = args ? TREE_VALUE (args) : 0;
5607 if (type == void_type_node)
5614 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5615 pedwarn_with_decl (decl1,
5616 "first argument of `%s' should be `int'");
5620 if (TREE_CODE (type) != POINTER_TYPE
5621 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5622 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5624 pedwarn_with_decl (decl1,
5625 "second argument of `%s' should be `char **'");
5629 if (TREE_CODE (type) != POINTER_TYPE
5630 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5631 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5633 pedwarn_with_decl (decl1,
5634 "third argument of `%s' should probably be `char **'");
5639 /* It is intentional that this message does not mention the third
5640 argument because it's only mentioned in an appendix of the
5642 if (argct > 0 && (argct < 2 || argct > 3))
5643 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5645 if (! TREE_PUBLIC (decl1))
5646 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5649 /* Record the decl so that the function name is defined.
5650 If we already have a decl for this name, and it is a FUNCTION_DECL,
5651 use the old decl. */
5653 current_function_decl = pushdecl (decl1);
5656 declare_parm_level (1);
5658 make_decl_rtl (current_function_decl, NULL);
5660 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5661 /* Promote the value to int before returning it. */
5662 if (c_promoting_integer_type_p (restype))
5664 /* It retains unsignedness if not really getting wider. */
5665 if (TREE_UNSIGNED (restype)
5666 && (TYPE_PRECISION (restype)
5667 == TYPE_PRECISION (integer_type_node)))
5668 restype = unsigned_type_node;
5670 restype = integer_type_node;
5672 DECL_RESULT (current_function_decl)
5673 = build_decl (RESULT_DECL, NULL_TREE, restype);
5675 /* If this fcn was already referenced via a block-scope `extern' decl
5676 (or an implicit decl), propagate certain information about the usage. */
5677 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5678 TREE_ADDRESSABLE (current_function_decl) = 1;
5680 immediate_size_expand = old_immediate_size_expand;
5682 start_fname_decls ();
5687 /* Store the parameter declarations into the current function declaration.
5688 This is called after parsing the parameter declarations, before
5689 digesting the body of the function.
5691 For an old-style definition, modify the function's type
5692 to specify at least the number of arguments. */
5697 tree fndecl = current_function_decl;
5700 /* This is either a chain of PARM_DECLs (if a prototype was used)
5701 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5702 tree specparms = current_function_parms;
5704 /* This is a list of types declared among parms in a prototype. */
5705 tree parmtags = current_function_parm_tags;
5707 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5708 tree parmdecls = getdecls ();
5710 /* This is a chain of any other decls that came in among the parm
5711 declarations. If a parm is declared with enum {foo, bar} x;
5712 then CONST_DECLs for foo and bar are put here. */
5715 /* The function containing FNDECL, if any. */
5716 tree context = decl_function_context (fndecl);
5718 /* Nonzero if this definition is written with a prototype. */
5721 int saved_warn_shadow = warn_shadow;
5723 /* Don't re-emit shadow warnings. */
5726 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5728 /* This case is when the function was defined with an ANSI prototype.
5729 The parms already have decls, so we need not do anything here
5730 except record them as in effect
5731 and complain if any redundant old-style parm decls were written. */
5742 error_with_decl (fndecl,
5743 "parm types given both in parmlist and separately");
5744 /* Get rid of the erroneous decls; don't keep them on
5745 the list of parms, since they might not be PARM_DECLs. */
5746 for (decl = current_binding_level->names;
5747 decl; decl = TREE_CHAIN (decl))
5748 if (DECL_NAME (decl))
5749 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = 0;
5750 for (link = current_binding_level->shadowed;
5751 link; link = TREE_CHAIN (link))
5752 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5753 current_binding_level->names = 0;
5754 current_binding_level->shadowed = 0;
5757 specparms = nreverse (specparms);
5758 for (parm = specparms; parm; parm = next)
5760 next = TREE_CHAIN (parm);
5761 if (TREE_CODE (parm) == PARM_DECL)
5763 if (DECL_NAME (parm) == 0)
5764 error_with_decl (parm, "parameter name omitted");
5765 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
5766 && VOID_TYPE_P (TREE_TYPE (parm)))
5768 error_with_decl (parm, "parameter `%s' declared void");
5769 /* Change the type to error_mark_node so this parameter
5770 will be ignored by assign_parms. */
5771 TREE_TYPE (parm) = error_mark_node;
5777 /* If we find an enum constant or a type tag,
5778 put it aside for the moment. */
5779 TREE_CHAIN (parm) = 0;
5780 others = chainon (others, parm);
5784 /* Get the decls in their original chain order
5785 and record in the function. */
5786 DECL_ARGUMENTS (fndecl) = getdecls ();
5789 /* If this function takes a variable number of arguments,
5790 add a phony parameter to the end of the parm list,
5791 to represent the position of the first unnamed argument. */
5792 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5795 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5796 /* Let's hope the address of the unnamed parm
5797 won't depend on its type. */
5798 TREE_TYPE (dummy) = integer_type_node;
5799 DECL_ARG_TYPE (dummy) = integer_type_node;
5800 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
5804 /* Now pushdecl the enum constants. */
5805 for (parm = others; parm; parm = next)
5807 next = TREE_CHAIN (parm);
5808 if (DECL_NAME (parm) == 0)
5810 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5812 else if (TREE_CODE (parm) != PARM_DECL)
5816 storetags (chainon (parmtags, gettags ()));
5820 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5821 each with a parm name as the TREE_VALUE.
5823 PARMDECLS is a chain of declarations for parameters.
5824 Warning! It can also contain CONST_DECLs which are not parameters
5825 but are names of enumerators of any enum types
5826 declared among the parameters.
5828 First match each formal parameter name with its declaration.
5829 Associate decls with the names and store the decls
5830 into the TREE_PURPOSE slots. */
5832 /* We use DECL_WEAK as a flag to show which parameters have been
5833 seen already since it is not used on PARM_DECL or CONST_DECL. */
5834 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5835 DECL_WEAK (parm) = 0;
5837 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5839 tree tail, found = NULL;
5841 if (TREE_VALUE (parm) == 0)
5843 error_with_decl (fndecl,
5844 "parameter name missing from parameter list");
5845 TREE_PURPOSE (parm) = 0;
5849 /* See if any of the parmdecls specifies this parm by name.
5850 Ignore any enumerator decls. */
5851 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5852 if (DECL_NAME (tail) == TREE_VALUE (parm)
5853 && TREE_CODE (tail) == PARM_DECL)
5859 /* If declaration already marked, we have a duplicate name.
5860 Complain, and don't use this decl twice. */
5861 if (found && DECL_WEAK (found))
5863 error_with_decl (found, "multiple parameters named `%s'");
5867 /* If the declaration says "void", complain and ignore it. */
5868 if (found && VOID_TYPE_P (TREE_TYPE (found)))
5870 error_with_decl (found, "parameter `%s' declared void");
5871 TREE_TYPE (found) = integer_type_node;
5872 DECL_ARG_TYPE (found) = integer_type_node;
5873 layout_decl (found, 0);
5876 /* If no declaration found, default to int. */
5879 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5881 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5882 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5883 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5885 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
5886 else if (extra_warnings)
5887 warning_with_decl (found, "type of `%s' defaults to `int'");
5891 TREE_PURPOSE (parm) = found;
5893 /* Mark this decl as "already found". */
5894 DECL_WEAK (found) = 1;
5897 /* Put anything which is on the parmdecls chain and which is
5898 not a PARM_DECL onto the list NONPARMS. (The types of
5899 non-parm things which might appear on the list include
5900 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5901 any actual PARM_DECLs not matched with any names. */
5904 for (parm = parmdecls; parm;)
5906 tree next = TREE_CHAIN (parm);
5907 TREE_CHAIN (parm) = 0;
5909 if (TREE_CODE (parm) != PARM_DECL)
5910 nonparms = chainon (nonparms, parm);
5913 /* Complain about args with incomplete types. */
5914 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5916 error_with_decl (parm, "parameter `%s' has incomplete type");
5917 TREE_TYPE (parm) = error_mark_node;
5920 if (! DECL_WEAK (parm))
5922 error_with_decl (parm,
5923 "declaration for parameter `%s' but no such parameter");
5924 /* Pretend the parameter was not missing.
5925 This gets us to a standard state and minimizes
5926 further error messages. */
5928 = chainon (specparms,
5929 tree_cons (parm, NULL_TREE, NULL_TREE));
5936 /* Chain the declarations together in the order of the list of
5937 names. Store that chain in the function decl, replacing the
5940 DECL_ARGUMENTS (fndecl) = 0;
5943 for (last = 0; parm; parm = TREE_CHAIN (parm))
5944 if (TREE_PURPOSE (parm))
5947 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
5949 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5950 last = TREE_PURPOSE (parm);
5951 TREE_CHAIN (last) = 0;
5955 /* If there was a previous prototype,
5956 set the DECL_ARG_TYPE of each argument according to
5957 the type previously specified, and report any mismatches. */
5959 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5962 for (parm = DECL_ARGUMENTS (fndecl),
5963 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5964 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5965 != void_type_node));
5966 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5968 if (parm == 0 || type == 0
5969 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5971 error ("number of arguments doesn't match prototype");
5972 error_with_file_and_line (current_function_prototype_file,
5973 current_function_prototype_line,
5974 "prototype declaration");
5977 /* Type for passing arg must be consistent with that
5978 declared for the arg. ISO C says we take the unqualified
5979 type for parameters declared with qualified type. */
5980 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5981 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
5983 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5984 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5986 /* Adjust argument to match prototype. E.g. a previous
5987 `int foo(float);' prototype causes
5988 `int foo(x) float x; {...}' to be treated like
5989 `int foo(float x) {...}'. This is particularly
5990 useful for argument types like uid_t. */
5991 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5993 if (PROMOTE_PROTOTYPES
5994 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5995 && TYPE_PRECISION (TREE_TYPE (parm))
5996 < TYPE_PRECISION (integer_type_node))
5997 DECL_ARG_TYPE (parm) = integer_type_node;
6001 pedwarn ("promoted argument `%s' doesn't match prototype",
6002 IDENTIFIER_POINTER (DECL_NAME (parm)));
6003 warning_with_file_and_line
6004 (current_function_prototype_file,
6005 current_function_prototype_line,
6006 "prototype declaration");
6011 error ("argument `%s' doesn't match prototype",
6012 IDENTIFIER_POINTER (DECL_NAME (parm)));
6013 error_with_file_and_line (current_function_prototype_file,
6014 current_function_prototype_line,
6015 "prototype declaration");
6019 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6022 /* Otherwise, create a prototype that would match. */
6026 tree actual = 0, last = 0, type;
6028 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6030 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6032 TREE_CHAIN (last) = type;
6037 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6039 TREE_CHAIN (last) = type;
6043 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6044 of the type of this function, but we need to avoid having this
6045 affect the types of other similarly-typed functions, so we must
6046 first force the generation of an identical (but separate) type
6047 node for the relevant function type. The new node we create
6048 will be a variant of the main variant of the original function
6051 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6053 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6056 /* Now store the final chain of decls for the arguments
6057 as the decl-chain of the current lexical scope.
6058 Put the enumerators in as well, at the front so that
6059 DECL_ARGUMENTS is not modified. */
6061 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6064 /* Make sure the binding level for the top of the function body
6065 gets a BLOCK if there are any in the function.
6066 Otherwise, the dbx output is wrong. */
6068 keep_next_if_subblocks = 1;
6070 /* ??? This might be an improvement,
6071 but needs to be thought about some more. */
6073 keep_next_level_flag = 1;
6076 /* Write a record describing this function definition to the prototypes
6077 file (if requested). */
6079 gen_aux_info_record (fndecl, 1, 0, prototype);
6081 /* Initialize the RTL code for the function. */
6082 init_function_start (fndecl, input_filename, input_line);
6084 /* Begin the statement tree for this function. */
6085 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6087 /* If this is a nested function, save away the sizes of any
6088 variable-size types so that we can expand them when generating
6094 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6095 = nreverse (get_pending_sizes ());
6096 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6099 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6102 /* This function is being processed in whole-function mode. */
6103 cfun->x_whole_function_mode_p = 1;
6105 /* Even though we're inside a function body, we still don't want to
6106 call expand_expr to calculate the size of a variable-sized array.
6107 We haven't necessarily assigned RTL to all variables yet, so it's
6108 not safe to try to expand expressions involving them. */
6109 immediate_size_expand = 0;
6110 cfun->x_dont_save_pending_sizes_p = 1;
6112 warn_shadow = saved_warn_shadow;
6115 /* Finish up a function declaration and compile that function
6116 all the way to assembler language output. The free the storage
6117 for the function definition.
6119 This is called after parsing the body of the function definition.
6121 NESTED is nonzero if the function being finished is nested in another.
6122 CAN_DEFER_P is nonzero if the function may be deferred. */
6125 finish_function (nested, can_defer_p)
6129 tree fndecl = current_function_decl;
6131 /* When a function declaration is totally empty, e.g.
6133 (the argument list is irrelevant) the compstmt rule will not
6134 bother calling pushlevel/poplevel, which means we get here with
6135 the binding_level stack out of sync. Detect this situation by
6136 noticing that the current_binding_level is still as
6137 store_parm_decls left it, and do a dummy push/pop to get back to
6138 consistency. Note that the call to pushlevel does not actually
6139 push another binding level - see there for details. */
6140 if (current_binding_level->parm_flag && keep_next_if_subblocks)
6147 /* This caused &foo to be of type ptr-to-const-function which then
6148 got a warning when stored in a ptr-to-function variable. */
6149 TREE_READONLY (fndecl) = 1;
6152 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6154 /* Must mark the RESULT_DECL as being in this function. */
6156 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6158 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6160 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6161 != integer_type_node)
6163 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6164 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6166 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6170 #ifdef DEFAULT_MAIN_RETURN
6171 /* Make it so that `main' always returns success by default. */
6172 DEFAULT_MAIN_RETURN;
6175 c_expand_return (integer_zero_node);
6180 finish_fname_decls ();
6182 /* Tie off the statement tree for this function. */
6183 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6185 /* Complain if there's just no return statement. */
6186 if (warn_return_type
6187 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6188 && !current_function_returns_value && !current_function_returns_null
6189 /* Don't complain if we abort. */
6190 && !current_function_returns_abnormally
6191 /* Don't warn for main(). */
6192 && !MAIN_NAME_P (DECL_NAME (fndecl))
6193 /* Or if they didn't actually specify a return type. */
6194 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6195 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6196 inline function, as we might never be compiled separately. */
6197 && DECL_INLINE (fndecl))
6198 warning ("no return statement in function returning non-void");
6200 /* Clear out memory we no longer need. */
6201 free_after_parsing (cfun);
6202 /* Since we never call rest_of_compilation, we never clear
6203 CFUN. Do so explicitly. */
6204 free_after_compilation (cfun);
6207 if (flag_unit_at_a_time && can_defer_p)
6209 cgraph_finalize_function (fndecl, DECL_SAVED_TREE (fndecl));
6210 current_function_decl = NULL;
6216 /* Function is parsed.
6217 Generate RTL for the body of this function or defer
6218 it for later expansion. */
6219 int uninlinable = 1;
6221 /* There's no reason to do any of the work here if we're only doing
6222 semantic analysis; this code just generates RTL. */
6223 if (flag_syntax_only)
6225 current_function_decl = NULL;
6226 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6230 if (flag_inline_trees)
6232 /* First, cache whether the current function is inlinable. Some
6233 predicates depend on cfun and current_function_decl to
6234 function completely. */
6235 timevar_push (TV_INTEGRATION);
6236 uninlinable = ! tree_inlinable_function_p (fndecl, 0);
6239 /* We defer functions marked inline *even if* the function
6240 itself is not inlinable. This is because we don't yet
6241 know if the function will actually be used; we may be
6242 able to avoid emitting it entirely. */
6243 && (! uninlinable || DECL_DECLARED_INLINE_P (fndecl))
6244 /* Save function tree for inlining. Should return 0 if the
6245 language does not support function deferring or the
6246 function could not be deferred. */
6247 && defer_fn (fndecl))
6249 /* Let the back-end know that this function exists. */
6250 (*debug_hooks->deferred_inline_function) (fndecl);
6251 timevar_pop (TV_INTEGRATION);
6252 current_function_decl = NULL;
6256 /* Then, inline any functions called in it. */
6257 optimize_inline_calls (fndecl);
6258 timevar_pop (TV_INTEGRATION);
6261 c_expand_body (fndecl);
6263 /* Keep the function body if it's needed for inlining or dumping. */
6264 if (uninlinable && !dump_enabled_p (TDI_all))
6266 /* Allow the body of the function to be garbage collected. */
6267 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6270 /* Let the error reporting routines know that we're outside a
6271 function. For a nested function, this value is used in
6272 c_pop_function_context and then reset via pop_function_context. */
6273 current_function_decl = NULL;
6277 /* Generate the RTL for a deferred function FNDECL. */
6280 c_expand_deferred_function (fndecl)
6283 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6284 function was deferred, e.g. in duplicate_decls. */
6285 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6287 if (flag_inline_trees)
6289 timevar_push (TV_INTEGRATION);
6290 optimize_inline_calls (fndecl);
6291 timevar_pop (TV_INTEGRATION);
6293 c_expand_body (fndecl);
6294 current_function_decl = NULL;
6298 /* Called to move the SAVE_EXPRs for parameter declarations in a
6299 nested function into the nested function. DATA is really the
6300 nested FUNCTION_DECL. */
6303 set_save_expr_context (tree *tp,
6307 if (TREE_CODE (*tp) == SAVE_EXPR && !SAVE_EXPR_CONTEXT (*tp))
6308 SAVE_EXPR_CONTEXT (*tp) = (tree) data;
6309 /* Do not walk back into the SAVE_EXPR_CONTEXT; that will cause
6311 else if (DECL_P (*tp))
6317 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6318 then we are already in the process of generating RTL for another
6319 function. If can_defer_p is zero, we won't attempt to defer the
6320 generation of RTL. */
6323 c_expand_body_1 (fndecl, nested_p)
6327 timevar_push (TV_EXPAND);
6331 /* Make sure that we will evaluate variable-sized types involved
6332 in our function's type. */
6333 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6334 /* Squirrel away our current state. */
6335 push_function_context ();
6338 /* Initialize the RTL code for the function. */
6339 current_function_decl = fndecl;
6340 input_filename = DECL_SOURCE_FILE (fndecl);
6341 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6342 input_line = DECL_SOURCE_LINE (fndecl);
6344 /* This function is being processed in whole-function mode. */
6345 cfun->x_whole_function_mode_p = 1;
6347 /* Even though we're inside a function body, we still don't want to
6348 call expand_expr to calculate the size of a variable-sized array.
6349 We haven't necessarily assigned RTL to all variables yet, so it's
6350 not safe to try to expand expressions involving them. */
6351 immediate_size_expand = 0;
6352 cfun->x_dont_save_pending_sizes_p = 1;
6354 /* Set up parameters and prepare for return, for the function. */
6355 expand_function_start (fndecl, 0);
6357 /* If the function has a variably modified type, there may be
6358 SAVE_EXPRs in the parameter types. Their context must be set to
6359 refer to this function; they cannot be expanded in the containing
6361 if (decl_function_context (fndecl)
6362 && variably_modified_type_p (TREE_TYPE (fndecl)))
6363 walk_tree (&TREE_TYPE (fndecl), set_save_expr_context, fndecl,
6366 /* If this function is `main', emit a call to `__main'
6367 to run global initializers, etc. */
6368 if (DECL_NAME (fndecl)
6369 && MAIN_NAME_P (DECL_NAME (fndecl))
6370 && DECL_CONTEXT (fndecl) == NULL_TREE)
6371 expand_main_function ();
6373 /* Generate the RTL for this function. */
6374 expand_stmt (DECL_SAVED_TREE (fndecl));
6376 /* We hard-wired immediate_size_expand to zero above.
6377 expand_function_end will decrement this variable. So, we set the
6378 variable to one here, so that after the decrement it will remain
6380 immediate_size_expand = 1;
6382 /* Allow language dialects to perform special processing. */
6383 if (lang_expand_function_end)
6384 (*lang_expand_function_end) ();
6386 /* Generate rtl for function exit. */
6387 expand_function_end (input_filename, input_line, 0);
6389 /* If this is a nested function, protect the local variables in the stack
6390 above us from being collected while we're compiling this function. */
6392 ggc_push_context ();
6394 /* Run the optimizers and output the assembler code for this function. */
6395 rest_of_compilation (fndecl);
6397 /* Undo the GC context switch. */
6401 /* With just -Wextra, complain only if function returns both with
6402 and without a value. */
6404 && current_function_returns_value
6405 && current_function_returns_null)
6406 warning ("this function may return with or without a value");
6408 /* If requested, warn about function definitions where the function will
6409 return a value (usually of some struct or union type) which itself will
6410 take up a lot of stack space. */
6412 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6414 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6416 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6417 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6418 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6421 unsigned int size_as_int
6422 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6424 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6425 warning_with_decl (fndecl,
6426 "size of return value of `%s' is %u bytes",
6429 warning_with_decl (fndecl,
6430 "size of return value of `%s' is larger than %d bytes",
6435 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6436 && ! flag_inline_trees)
6438 /* Stop pointing to the local nodes about to be freed.
6439 But DECL_INITIAL must remain nonzero so we know this
6440 was an actual function definition.
6441 For a nested function, this is done in c_pop_function_context.
6442 If rest_of_compilation set this to 0, leave it 0. */
6443 if (DECL_INITIAL (fndecl) != 0)
6444 DECL_INITIAL (fndecl) = error_mark_node;
6446 DECL_ARGUMENTS (fndecl) = 0;
6449 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6451 if (targetm.have_ctors_dtors)
6452 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6453 DEFAULT_INIT_PRIORITY);
6455 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6458 if (DECL_STATIC_DESTRUCTOR (fndecl))
6460 if (targetm.have_ctors_dtors)
6461 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6462 DEFAULT_INIT_PRIORITY);
6464 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6468 /* Return to the enclosing function. */
6469 pop_function_context ();
6470 timevar_pop (TV_EXPAND);
6473 /* Like c_expand_body_1 but only for unnested functions. */
6476 c_expand_body (fndecl)
6479 c_expand_body_1 (fndecl, 0);
6482 /* Check the declarations given in a for-loop for satisfying the C99
6485 check_for_loop_decls ()
6491 /* If we get here, declarations have been used in a for loop without
6492 the C99 for loop scope. This doesn't make much sense, so don't
6494 error ("`for' loop initial declaration used outside C99 mode");
6497 /* C99 subclause 6.8.5 paragraph 3:
6499 [#3] The declaration part of a for statement shall only
6500 declare identifiers for objects having storage class auto or
6503 It isn't clear whether, in this sentence, "identifiers" binds to
6504 "shall only declare" or to "objects" - that is, whether all identifiers
6505 declared must be identifiers for objects, or whether the restriction
6506 only applies to those that are. (A question on this in comp.std.c
6507 in November 2000 received no answer.) We implement the strictest
6508 interpretation, to avoid creating an extension which later causes
6511 for (t = gettags (); t; t = TREE_CHAIN (t))
6513 if (TREE_PURPOSE (t) != 0)
6515 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6517 if (code == RECORD_TYPE)
6518 error ("`struct %s' declared in `for' loop initial declaration",
6519 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6520 else if (code == UNION_TYPE)
6521 error ("`union %s' declared in `for' loop initial declaration",
6522 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6524 error ("`enum %s' declared in `for' loop initial declaration",
6525 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6529 for (t = getdecls (); t; t = TREE_CHAIN (t))
6531 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6532 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6533 else if (TREE_STATIC (t))
6534 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6535 else if (DECL_EXTERNAL (t))
6536 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6540 /* Save and restore the variables in this file and elsewhere
6541 that keep track of the progress of compilation of the current function.
6542 Used for nested functions. */
6544 struct language_function GTY(())
6546 struct c_language_function base;
6548 tree shadowed_labels;
6551 int returns_abnormally;
6552 int warn_about_return_type;
6554 struct binding_level *binding_level;
6557 /* Save and reinitialize the variables
6558 used during compilation of a C function. */
6561 c_push_function_context (f)
6564 struct language_function *p;
6565 p = ((struct language_function *)
6566 ggc_alloc (sizeof (struct language_function)));
6569 p->base.x_stmt_tree = c_stmt_tree;
6570 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6571 p->named_labels = named_labels;
6572 p->shadowed_labels = shadowed_labels;
6573 p->returns_value = current_function_returns_value;
6574 p->returns_null = current_function_returns_null;
6575 p->returns_abnormally = current_function_returns_abnormally;
6576 p->warn_about_return_type = warn_about_return_type;
6577 p->extern_inline = current_extern_inline;
6578 p->binding_level = current_binding_level;
6581 /* Restore the variables used during compilation of a C function. */
6584 c_pop_function_context (f)
6587 struct language_function *p = f->language;
6590 /* Bring back all the labels that were shadowed. */
6591 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6592 if (DECL_NAME (TREE_VALUE (link)) != 0)
6593 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6594 = TREE_VALUE (link);
6596 if (DECL_SAVED_INSNS (current_function_decl) == 0
6597 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6599 /* Stop pointing to the local nodes about to be freed. */
6600 /* But DECL_INITIAL must remain nonzero so we know this
6601 was an actual function definition. */
6602 DECL_INITIAL (current_function_decl) = error_mark_node;
6603 DECL_ARGUMENTS (current_function_decl) = 0;
6606 c_stmt_tree = p->base.x_stmt_tree;
6607 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6608 named_labels = p->named_labels;
6609 shadowed_labels = p->shadowed_labels;
6610 current_function_returns_value = p->returns_value;
6611 current_function_returns_null = p->returns_null;
6612 current_function_returns_abnormally = p->returns_abnormally;
6613 warn_about_return_type = p->warn_about_return_type;
6614 current_extern_inline = p->extern_inline;
6615 current_binding_level = p->binding_level;
6620 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6623 c_dup_lang_specific_decl (decl)
6626 struct lang_decl *ld;
6628 if (!DECL_LANG_SPECIFIC (decl))
6631 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
6632 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
6633 sizeof (struct lang_decl));
6634 DECL_LANG_SPECIFIC (decl) = ld;
6637 /* The functions below are required for functionality of doing
6638 function at once processing in the C front end. Currently these
6639 functions are not called from anywhere in the C front end, but as
6640 these changes continue, that will change. */
6642 /* Returns nonzero if the current statement is a full expression,
6643 i.e. temporaries created during that statement should be destroyed
6644 at the end of the statement. */
6647 stmts_are_full_exprs_p ()
6652 /* Returns the stmt_tree (if any) to which statements are currently
6653 being added. If there is no active statement-tree, NULL is
6657 current_stmt_tree ()
6659 return &c_stmt_tree;
6662 /* Returns the stack of SCOPE_STMTs for the current function. */
6665 current_scope_stmt_stack ()
6667 return &c_scope_stmt_stack;
6670 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6674 anon_aggr_type_p (node)
6675 tree node ATTRIBUTE_UNUSED;
6680 /* Dummy function in place of callback used by C++. */
6683 extract_interface_info ()
6687 /* Return a new COMPOUND_STMT, after adding it to the current
6691 c_begin_compound_stmt ()
6695 /* Create the COMPOUND_STMT. */
6696 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6701 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6705 c_expand_decl_stmt (t)
6708 tree decl = DECL_STMT_DECL (t);
6710 /* Expand nested functions. */
6711 if (TREE_CODE (decl) == FUNCTION_DECL
6712 && DECL_CONTEXT (decl) == current_function_decl
6713 && DECL_SAVED_TREE (decl))
6714 c_expand_body_1 (decl, 1);
6717 /* Return the global value of T as a symbol. */
6720 identifier_global_value (t)
6723 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6724 if (decl == 0 || DECL_CONTEXT (decl) == 0)
6727 /* Shadowed by something else; find the true global value. */
6728 for (decl = global_binding_level->names; decl; decl = TREE_CHAIN (decl))
6729 if (DECL_NAME (decl) == t)
6732 /* Only local values for this decl. */
6736 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6737 otherwise the name is found in ridpointers from RID_INDEX. */
6740 record_builtin_type (rid_index, name, type)
6747 id = ridpointers[(int) rid_index];
6749 id = get_identifier (name);
6750 pushdecl (build_decl (TYPE_DECL, id, type));
6753 /* Build the void_list_node (void_type_node having been created). */
6755 build_void_list_node ()
6757 tree t = build_tree_list (NULL_TREE, void_type_node);
6761 /* Return something to represent absolute declarators containing a *.
6762 TARGET is the absolute declarator that the * contains.
6763 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6764 to apply to the pointer type, represented as identifiers, possible mixed
6767 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6768 if attributes are present) and whose type is the modifier list. */
6771 make_pointer_declarator (type_quals_attrs, target)
6772 tree type_quals_attrs, target;
6775 tree itarget = target;
6776 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6777 if (attrs != NULL_TREE)
6778 itarget = tree_cons (attrs, target, NULL_TREE);
6779 return build1 (INDIRECT_REF, quals, itarget);
6782 #include "gt-c-decl.h"