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 location_t pending_invalid_xref_location;
70 /* While defining an enum type, this is 1 plus the last enumerator
71 constant value. Note that will do not have to save this or `enum_overflow'
72 around nested function definition since such a definition could only
73 occur in an enum value expression and we don't use these variables in
76 static tree enum_next_value;
78 /* Nonzero means that there was overflow computing enum_next_value. */
80 static int enum_overflow;
82 /* Parsing a function declarator leaves a list of parameter names
83 or a chain or parameter decls here. */
85 static tree last_function_parms;
87 /* Parsing a function declarator leaves here a chain of structure
88 and enum types declared in the parmlist. */
90 static tree last_function_parm_tags;
92 /* After parsing the declarator that starts a function definition,
93 `start_function' puts here the list of parameter names or chain of decls.
94 `store_parm_decls' finds it here. */
96 static tree current_function_parms;
98 /* Similar, for last_function_parm_tags. */
99 static tree current_function_parm_tags;
101 /* Similar, for the file and line that the prototype came from if this is
102 an old-style definition. */
103 static location_t current_function_prototype_locus;
105 /* The current statement tree. */
107 static GTY(()) struct stmt_tree_s c_stmt_tree;
109 /* The current scope statement stack. */
111 static GTY(()) tree c_scope_stmt_stack;
113 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
114 that have names. Here so we can clear out their names' definitions
115 at the end of the function. */
117 static GTY(()) tree named_labels;
119 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
121 static GTY(()) tree shadowed_labels;
123 /* A list of external DECLs that appeared at block scope when there was
124 some other global meaning for that identifier. */
125 static GTY(()) tree truly_local_externals;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a call to a noreturn function is seen. */
140 int current_function_returns_abnormally;
142 /* Set to nonzero by `grokdeclarator' for a function
143 whose return type is defaulted, if warnings for this are desired. */
145 static int warn_about_return_type;
147 /* Nonzero when starting a function declared `extern inline'. */
149 static int current_extern_inline;
151 /* For each binding contour we allocate a binding_level structure
152 * which records the names defined in that contour.
155 * 1) one for each function definition,
156 * where internal declarations of the parameters appear.
157 * 2) one for each compound statement,
158 * to record its declarations.
160 * The current meaning of a name can be found by searching the levels from
161 * the current one out to the global one.
164 struct binding_level GTY(())
166 /* A chain of _DECL nodes for all variables, constants, functions,
167 and typedef types. These are in the reverse of the order supplied.
171 /* A list of structure, union and enum definitions,
172 * for looking up tag names.
173 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
174 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
175 * or ENUMERAL_TYPE node.
179 /* For each level, a list of shadowed outer-level definitions
180 to be restored when this level is popped.
181 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
182 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
185 /* For each level, a list of shadowed outer-level tag definitions
186 to be restored when this level is popped.
187 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
188 whose TREE_VALUE is its old definition (a kind of ..._TYPE node). */
191 /* For each level (except not the global one),
192 a chain of BLOCK nodes for all the levels
193 that were entered and exited one level down. */
196 /* The binding level which this one is contained in (inherits from). */
197 struct binding_level *level_chain;
199 /* Nonzero if we are currently filling this level with parameter
203 /* Nonzero if this is the outermost block scope of a function body.
204 This scope contains both the parameters and the local variables
205 declared in the outermost block. */
208 /* Nonzero means make a BLOCK for this level regardless of all else. */
211 /* Nonzero means make a BLOCK if this level has any subblocks. */
212 char keep_if_subblocks;
214 /* List of decls in `names' that have incomplete structure or
216 tree incomplete_list;
218 /* A list of decls giving the (reversed) specified order of parms,
219 not including any forward-decls in the parmlist.
220 This is so we can put the parms in proper order for assign_parms. */
224 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
226 /* The binding level currently in effect. */
228 static GTY(()) struct binding_level *current_binding_level;
230 /* A chain of binding_level structures awaiting reuse. */
232 static GTY((deletable (""))) struct binding_level *free_binding_level;
234 /* The outermost binding level, for names of file scope.
235 This is created when the compiler is started and exists
236 through the entire run. */
238 static GTY(()) struct binding_level *global_binding_level;
240 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
242 static int keep_next_level_flag;
244 /* Nonzero means make a BLOCK for the next level pushed
245 if it has subblocks. */
247 static int keep_next_if_subblocks;
249 /* The chain of outer levels of label scopes.
250 This uses the same data structure used for binding levels,
251 but it works differently: each link in the chain records
252 saved values of named_labels and shadowed_labels for
253 a label binding level outside the current one. */
255 static GTY(()) struct binding_level *label_level_chain;
257 /* Functions called automatically at the beginning and end of execution. */
259 tree static_ctors, static_dtors;
261 /* Forward declarations. */
263 static struct binding_level *make_binding_level PARAMS ((void));
264 static void pop_binding_level PARAMS ((struct binding_level **));
265 static int duplicate_decls PARAMS ((tree, tree, int));
266 static int redeclaration_error_message PARAMS ((tree, tree));
267 static void implicit_decl_warning PARAMS ((tree));
268 static void storedecls PARAMS ((tree));
269 static void storetags PARAMS ((tree));
270 static tree lookup_tag PARAMS ((enum tree_code, tree, int));
271 static tree lookup_name_current_level PARAMS ((tree));
272 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
274 static tree grokparms PARAMS ((tree, int));
275 static void layout_array_type PARAMS ((tree));
276 static tree c_make_fname_decl PARAMS ((tree, int));
277 static void c_expand_body_1 PARAMS ((tree, int));
278 static tree any_external_decl PARAMS ((tree));
279 static void record_external_decl PARAMS ((tree));
280 static void warn_if_shadowing PARAMS ((tree, tree));
281 static void clone_underlying_type PARAMS ((tree));
282 static bool flexible_array_type_p PARAMS ((tree));
284 /* States indicating how grokdeclarator() should handle declspecs marked
285 with __attribute__((deprecated)). An object declared as
286 __attribute__((deprecated)) suppresses warnings of uses of other
289 enum deprecated_states {
294 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
297 c_print_identifier (file, node, indent)
302 print_node (file, "symbol", IDENTIFIER_SYMBOL_VALUE (node), indent + 4);
303 print_node (file, "tag", IDENTIFIER_TAG_VALUE (node), indent + 4);
304 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
305 if (C_IS_RESERVED_WORD (node))
307 tree rid = ridpointers[C_RID_CODE (node)];
308 indent_to (file, indent + 4);
309 fprintf (file, "rid ");
310 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
311 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
315 /* Hook called at end of compilation to assume 1 elt
316 for a top-level tentative array defn that wasn't complete before. */
319 c_finish_incomplete_decl (decl)
322 if (TREE_CODE (decl) == VAR_DECL)
324 tree type = TREE_TYPE (decl);
325 if (type != error_mark_node
326 && TREE_CODE (type) == ARRAY_TYPE
327 && ! DECL_EXTERNAL (decl)
328 && TYPE_DOMAIN (type) == 0)
330 warning_with_decl (decl, "array `%s' assumed to have one element");
332 complete_array_type (type, NULL_TREE, 1);
334 layout_decl (decl, 0);
339 /* Reuse or create a struct for this binding level. */
341 static struct binding_level *
342 make_binding_level ()
344 struct binding_level *result;
345 if (free_binding_level)
347 result = free_binding_level;
348 free_binding_level = result->level_chain;
349 memset (result, 0, sizeof(struct binding_level));
352 result = (struct binding_level *)
353 ggc_alloc_cleared (sizeof (struct binding_level));
358 /* Remove a binding level from a list and add it to the level chain. */
361 pop_binding_level (lp)
362 struct binding_level **lp;
364 struct binding_level *l = *lp;
365 *lp = l->level_chain;
367 memset (l, 0, sizeof (struct binding_level));
368 l->level_chain = free_binding_level;
369 free_binding_level = l;
372 /* Nonzero if we are currently in the global binding level. */
377 return current_binding_level == global_binding_level;
383 keep_next_level_flag = 1;
386 /* Nonzero if the current level needs to have a BLOCK made. */
391 return ((current_binding_level->keep_if_subblocks
392 && current_binding_level->blocks != 0)
393 || current_binding_level->keep
394 || current_binding_level->names != 0
395 || current_binding_level->tags != 0);
398 /* Identify this binding level as a level of parameters.
399 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
400 But it turns out there is no way to pass the right value for
401 DEFINITION_FLAG, so we ignore it. */
404 declare_parm_level (definition_flag)
405 int definition_flag ATTRIBUTE_UNUSED;
407 current_binding_level->parm_flag = 1;
410 /* Nonzero if currently making parm declarations. */
415 return current_binding_level->parm_flag;
418 /* Enter a new binding level. */
422 int dummy ATTRIBUTE_UNUSED;
424 /* If this is the top level of a function, make sure that
425 NAMED_LABELS is 0. */
427 if (current_binding_level == global_binding_level)
430 if (keep_next_if_subblocks)
432 /* This is the transition from the parameters to the top level
433 of the function body. These are the same scope
434 (C99 6.2.1p4,6) so we do not push another binding level.
436 XXX Note kludge - keep_next_if_subblocks is set only by
437 store_parm_decls, which in turn is called when and only
438 when we are about to encounter the opening curly brace for
439 the function body. */
440 current_binding_level->parm_flag = 0;
441 current_binding_level->function_body = 1;
442 current_binding_level->keep |= keep_next_level_flag;
443 current_binding_level->keep_if_subblocks = 1;
445 keep_next_level_flag = 0;
446 keep_next_if_subblocks = 0;
450 struct binding_level *newlevel = make_binding_level ();
452 newlevel->keep = keep_next_level_flag;
453 newlevel->level_chain = current_binding_level;
454 current_binding_level = newlevel;
455 keep_next_level_flag = 0;
459 /* Exit a binding level.
460 Pop the level off, and restore the state of the identifier-decl mappings
461 that were in effect when this level was entered.
463 If KEEP is nonzero, this level had explicit declarations, so
464 and create a "block" (a BLOCK node) for the level
465 to record its declarations and subblocks for symbol table output.
467 If FUNCTIONBODY is nonzero, this level is the body of a function,
468 so create a block as if KEEP were set and also clear out all
471 If REVERSE is nonzero, reverse the order of decls before putting
472 them into the BLOCK. */
475 poplevel (keep, reverse, functionbody)
483 tree decls = current_binding_level->names;
484 tree tags = current_binding_level->tags;
485 tree subblocks = current_binding_level->blocks;
487 functionbody |= current_binding_level->function_body;
488 keep |= (current_binding_level->keep || functionbody
489 || (current_binding_level->keep_if_subblocks && subblocks != 0));
491 /* We used to warn about unused variables in expand_end_bindings,
492 i.e. while generating RTL. But in function-at-a-time mode we may
493 choose to never expand a function at all (e.g. auto inlining), so
494 we do this explicitly now. */
495 warn_about_unused_variables (decls);
497 /* Clear out the name-meanings declared on this level.
498 Propagate TREE_ADDRESSABLE from nested functions to their
499 containing functions. */
500 for (link = decls; link; link = TREE_CHAIN (link))
502 if (DECL_NAME (link) != 0)
504 if (DECL_EXTERNAL (link))
505 /* External decls stay in the symbol-value slot but are
507 C_DECL_INVISIBLE (link) = 1;
509 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (link)) = 0;
512 if (TREE_CODE (link) == FUNCTION_DECL
513 && ! TREE_ASM_WRITTEN (link)
514 && DECL_INITIAL (link) != 0
515 && TREE_ADDRESSABLE (link)
516 && DECL_ABSTRACT_ORIGIN (link) != 0
517 && DECL_ABSTRACT_ORIGIN (link) != link)
518 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (link)) = 1;
521 /* Clear out the tag-meanings declared on this level. */
522 for (link = tags; link; link = TREE_CHAIN (link))
523 if (TREE_PURPOSE (link))
524 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (link)) = 0;
526 /* Restore all name-meanings of the outer levels
527 that were shadowed by this level. */
529 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
530 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
532 /* Restore all tag-meanings of the outer levels
533 that were shadowed by this level. */
535 for (link = current_binding_level->shadowed_tags; link;
536 link = TREE_CHAIN (link))
537 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
539 /* If this is the top level block of a function, remove all
540 PARM_DECLs from current_binding_level->names; they are already
541 stored in DECL_ARGUMENTS of cfun->decl in proper order, should
542 not be put in BLOCK_VARS, and furthermore reversing them will
543 cause trouble later. They are all together at the end of the
545 if (functionbody && decls)
547 if (TREE_CODE (decls) == PARM_DECL)
552 while (TREE_CHAIN (link)
553 && TREE_CODE (TREE_CHAIN (link)) != PARM_DECL)
554 link = TREE_CHAIN (link);
556 TREE_CHAIN (link) = 0;
560 /* Get the decls in the order they were written.
561 Usually current_binding_level->names is in reverse order.
562 But parameter decls were previously put in forward order. */
565 decls = nreverse (decls);
567 /* If there were any declarations or structure tags in that level,
568 or if this level is a function body,
569 create a BLOCK to record them for the life of this function. */
574 block = make_node (BLOCK);
575 BLOCK_VARS (block) = decls;
576 BLOCK_SUBBLOCKS (block) = subblocks;
577 TREE_USED (block) = 1;
580 /* In each subblock, record that this is its superior. */
582 for (link = subblocks; link; link = TREE_CHAIN (link))
583 BLOCK_SUPERCONTEXT (link) = block;
585 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
586 binding contour so that they point to the appropriate construct, i.e.
587 either to the current FUNCTION_DECL node, or else to the BLOCK node
590 Note that for tagged types whose scope is just the formal parameter
591 list for some function type specification, we can't properly set
592 their TYPE_CONTEXTs here, because we don't have a pointer to the
593 appropriate FUNCTION_TYPE node readily available to us. For those
594 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
595 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
596 node which will represent the "scope" for these "parameter list local"
599 decl = functionbody ? current_function_decl : block;
601 for (link = tags; link; link = TREE_CHAIN (link))
602 TYPE_CONTEXT (TREE_VALUE (link)) = decl;
604 /* If the level being exited is the top level of a function, check
605 over all the labels, and clear out the current (function local)
606 meanings of their names. Then add them to BLOCK_VARS. */
610 for (link = named_labels; link; link = TREE_CHAIN (link))
612 tree label = TREE_VALUE (link);
614 if (DECL_INITIAL (label) == 0)
616 error_with_decl (label, "label `%s' used but not defined");
617 /* Avoid crashing later. */
618 define_label (input_filename, input_line,
621 else if (warn_unused_label && !TREE_USED (label))
622 warning_with_decl (label, "label `%s' defined but not used");
623 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
625 /* Put the labels into the "variables" of the
626 top-level block, so debugger can see them. */
627 TREE_CHAIN (label) = BLOCK_VARS (block);
628 BLOCK_VARS (block) = label;
632 /* Pop the current level, and free the structure for reuse. */
634 pop_binding_level (¤t_binding_level);
636 /* Dispose of the block that we just made inside some higher level. */
638 DECL_INITIAL (current_function_decl) = block;
640 current_binding_level->blocks
641 = chainon (current_binding_level->blocks, block);
642 /* If we did not make a block for the level just exited,
643 any blocks made for inner levels
644 (since they cannot be recorded as subblocks in that level)
645 must be carried forward so they will later become subblocks
646 of something else. */
648 current_binding_level->blocks
649 = chainon (current_binding_level->blocks, subblocks);
654 /* Insert BLOCK at the end of the list of subblocks of the
655 current binding level. This is used when a BIND_EXPR is expanded,
656 to handle the BLOCK node inside the BIND_EXPR. */
662 TREE_USED (block) = 1;
663 current_binding_level->blocks
664 = chainon (current_binding_level->blocks, block);
667 /* Set the BLOCK node for the innermost scope (the one we are
668 currently in). The RTL expansion machinery requires us to provide
669 this hook, but it is not useful in function-at-a-time mode. */
673 tree block ATTRIBUTE_UNUSED;
680 struct binding_level *newlevel;
682 newlevel = make_binding_level ();
684 /* Add this level to the front of the chain (stack) of label levels. */
686 newlevel->level_chain = label_level_chain;
687 label_level_chain = newlevel;
689 newlevel->names = named_labels;
690 newlevel->shadowed = shadowed_labels;
698 struct binding_level *level = label_level_chain;
701 /* Clear out the definitions of the declared labels in this level.
702 Leave in the list any ordinary, non-declared labels. */
703 for (link = named_labels, prev = 0; link;)
705 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
707 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
709 error_with_decl (TREE_VALUE (link),
710 "label `%s' used but not defined");
711 /* Avoid crashing later. */
712 define_label (input_filename, input_line,
713 DECL_NAME (TREE_VALUE (link)));
715 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
716 warning_with_decl (TREE_VALUE (link),
717 "label `%s' defined but not used");
718 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
720 /* Delete this element from the list. */
721 link = TREE_CHAIN (link);
723 TREE_CHAIN (prev) = link;
730 link = TREE_CHAIN (link);
734 /* Bring back all the labels that were shadowed. */
735 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
736 if (DECL_NAME (TREE_VALUE (link)) != 0)
737 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
740 named_labels = chainon (named_labels, level->names);
741 shadowed_labels = level->shadowed;
743 /* Pop the current level, and free the structure for reuse. */
744 pop_binding_level (&label_level_chain);
747 /* Push a definition or a declaration of struct, union or enum tag "name".
748 "type" should be the type node.
749 We assume that the tag "name" is not already defined.
751 Note that the definition may really be just a forward reference.
752 In that case, the TYPE_SIZE will be zero. */
758 struct binding_level *b = current_binding_level;
762 /* Record the identifier as the type's name if it has none. */
764 if (TYPE_NAME (type) == 0)
765 TYPE_NAME (type) = name;
767 if (IDENTIFIER_TAG_VALUE (name))
768 b->shadowed_tags = tree_cons (name, IDENTIFIER_TAG_VALUE (name),
770 IDENTIFIER_TAG_VALUE (name) = type;
773 b->tags = tree_cons (name, type, b->tags);
775 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
776 tagged type we just added to the current binding level. This fake
777 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
778 to output a representation of a tagged type, and it also gives
779 us a convenient place to record the "scope start" address for the
782 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
784 /* An approximation for now, so we can tell this is a function-scope tag.
785 This will be updated in poplevel. */
786 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
789 /* Handle when a new declaration NEWDECL
790 has the same name as an old one OLDDECL
791 in the same binding contour.
792 Prints an error message if appropriate.
794 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
797 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
798 and OLDDECL is in an outer binding level and should thus not be changed. */
801 duplicate_decls (newdecl, olddecl, different_binding_level)
802 tree newdecl, olddecl;
803 int different_binding_level;
805 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
806 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
807 && DECL_INITIAL (newdecl) != 0);
808 tree oldtype = TREE_TYPE (olddecl);
809 tree newtype = TREE_TYPE (newdecl);
812 if (DECL_P (olddecl))
814 if (TREE_CODE (newdecl) == FUNCTION_DECL
815 && TREE_CODE (olddecl) == FUNCTION_DECL
816 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
818 if (DECL_DECLARED_INLINE_P (newdecl)
819 && DECL_UNINLINABLE (newdecl)
820 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
821 /* Already warned elsewhere. */;
822 else if (DECL_DECLARED_INLINE_P (olddecl)
823 && DECL_UNINLINABLE (olddecl)
824 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
825 /* Already warned. */;
826 else if (DECL_DECLARED_INLINE_P (newdecl)
827 && ! DECL_DECLARED_INLINE_P (olddecl)
828 && DECL_UNINLINABLE (olddecl)
829 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
831 warning_with_decl (newdecl,
832 "function `%s' redeclared as inline");
833 warning_with_decl (olddecl,
834 "previous declaration of function `%s' with attribute noinline");
836 else if (DECL_DECLARED_INLINE_P (olddecl)
837 && DECL_UNINLINABLE (newdecl)
838 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
840 warning_with_decl (newdecl,
841 "function `%s' redeclared with attribute noinline");
842 warning_with_decl (olddecl,
843 "previous declaration of function `%s' was inline");
847 DECL_ATTRIBUTES (newdecl)
848 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
851 if (TREE_CODE (newtype) == ERROR_MARK
852 || TREE_CODE (oldtype) == ERROR_MARK)
855 /* New decl is completely inconsistent with the old one =>
856 tell caller to replace the old one.
857 This is always an error except in the case of shadowing a builtin. */
858 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
860 if (TREE_CODE (olddecl) == FUNCTION_DECL
861 && DECL_BUILT_IN (olddecl))
863 /* If you declare a built-in or predefined function name as static,
864 the old definition is overridden,
865 but optionally warn this was a bad choice of name. */
866 if (!TREE_PUBLIC (newdecl))
869 warning_with_decl (newdecl, "shadowing built-in function `%s'");
872 warning_with_decl (newdecl,
873 "built-in function `%s' declared as non-function");
877 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
878 error_with_decl (olddecl, "previous declaration of `%s'");
884 /* For real parm decl following a forward decl, return 1 so old decl
885 will be reused. Only allow this to happen once. */
886 if (types_match && TREE_CODE (newdecl) == PARM_DECL
887 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
889 TREE_ASM_WRITTEN (olddecl) = 0;
893 /* The new declaration is the same kind of object as the old one.
894 The declarations may partially match. Print warnings if they don't
895 match enough. Ultimately, copy most of the information from the new
896 decl to the old one, and keep using the old one. */
898 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
900 /* A function declaration for a built-in function. */
901 if (!TREE_PUBLIC (newdecl))
903 /* If you declare a built-in function name as static, the
904 built-in definition is overridden,
905 but optionally warn this was a bad choice of name. */
907 warning_with_decl (newdecl, "shadowing built-in function `%s'");
908 /* Discard the old built-in function. */
911 else if (!types_match)
913 /* Accept the return type of the new declaration if same modes. */
914 tree oldreturntype = TREE_TYPE (oldtype);
915 tree newreturntype = TREE_TYPE (newtype);
917 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
919 /* Function types may be shared, so we can't just modify
920 the return type of olddecl's function type. */
922 = build_function_type (newreturntype,
923 TYPE_ARG_TYPES (oldtype));
924 trytype = build_type_attribute_variant (trytype,
925 TYPE_ATTRIBUTES (oldtype));
927 types_match = comptypes (newtype, trytype);
931 /* Accept harmless mismatch in first argument type also.
932 This is for the ffs and fprintf builtins. */
933 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
934 && TYPE_ARG_TYPES (oldtype) != 0
935 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
936 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
937 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
938 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
940 /* Function types may be shared, so we can't just modify
941 the return type of olddecl's function type. */
943 = build_function_type (TREE_TYPE (oldtype),
944 tree_cons (NULL_TREE,
945 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
946 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
947 trytype = build_type_attribute_variant (trytype,
948 TYPE_ATTRIBUTES (oldtype));
950 types_match = comptypes (newtype, trytype);
954 if (! different_binding_level)
955 TREE_TYPE (olddecl) = oldtype;
957 else if (TYPE_ARG_TYPES (oldtype) == NULL
958 && TYPE_ARG_TYPES (newtype) != NULL)
960 /* For bcmp, bzero, fputs the builtin type has arguments not
961 specified. Use the ones from the prototype so that type checking
964 = build_function_type (TREE_TYPE (oldtype),
965 TYPE_ARG_TYPES (newtype));
966 trytype = build_type_attribute_variant (trytype,
967 TYPE_ATTRIBUTES (oldtype));
970 if (! different_binding_level)
971 TREE_TYPE (olddecl) = oldtype;
975 /* If types don't match for a built-in, throw away the built-in. */
976 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
980 else if (TREE_CODE (olddecl) == FUNCTION_DECL
981 && DECL_SOURCE_LINE (olddecl) == 0)
983 /* A function declaration for a predeclared function
984 that isn't actually built in. */
985 if (!TREE_PUBLIC (newdecl))
987 /* If you declare it as static, the
988 default definition is overridden. */
991 else if (!types_match)
993 /* If the types don't match, preserve volatility indication.
994 Later on, we will discard everything else about the
995 default declaration. */
996 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
999 /* Permit char *foo () to match void *foo (...) if not pedantic,
1000 if one of them came from a system header file. */
1001 else if (!types_match
1002 && TREE_CODE (olddecl) == FUNCTION_DECL
1003 && TREE_CODE (newdecl) == FUNCTION_DECL
1004 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1005 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1006 && (DECL_IN_SYSTEM_HEADER (olddecl)
1007 || DECL_IN_SYSTEM_HEADER (newdecl))
1008 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1009 && TYPE_ARG_TYPES (oldtype) == 0
1010 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1011 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1013 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1014 && TYPE_ARG_TYPES (newtype) == 0
1015 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1016 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1019 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1020 /* Make sure we keep void * as ret type, not char *. */
1021 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1022 TREE_TYPE (newdecl) = newtype = oldtype;
1024 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1025 we will come back here again. */
1026 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1028 /* Permit void foo (...) to match int foo (...) if the latter is the
1029 definition and implicit int was used. See c-torture/compile/920625-2.c. */
1030 else if (!types_match && new_is_definition
1031 && TREE_CODE (olddecl) == FUNCTION_DECL
1032 && TREE_CODE (newdecl) == FUNCTION_DECL
1033 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1034 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1035 && C_FUNCTION_IMPLICIT_INT (newdecl))
1037 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1038 /* Make sure we keep void as the return type. */
1039 TREE_TYPE (newdecl) = newtype = oldtype;
1040 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1042 else if (!types_match
1043 /* Permit char *foo (int, ...); followed by char *foo ();
1045 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1047 /* Return types must still match. */
1048 && comptypes (TREE_TYPE (oldtype),
1049 TREE_TYPE (newtype))
1050 && TYPE_ARG_TYPES (newtype) == 0))
1052 error_with_decl (newdecl, "conflicting types for `%s'");
1053 /* Check for function type mismatch
1054 involving an empty arglist vs a nonempty one. */
1055 if (TREE_CODE (olddecl) == FUNCTION_DECL
1056 && comptypes (TREE_TYPE (oldtype),
1057 TREE_TYPE (newtype))
1058 && ((TYPE_ARG_TYPES (oldtype) == 0
1059 && DECL_INITIAL (olddecl) == 0)
1061 (TYPE_ARG_TYPES (newtype) == 0
1062 && DECL_INITIAL (newdecl) == 0)))
1064 /* Classify the problem further. */
1065 tree t = TYPE_ARG_TYPES (oldtype);
1067 t = TYPE_ARG_TYPES (newtype);
1068 for (; t; t = TREE_CHAIN (t))
1070 tree type = TREE_VALUE (t);
1072 if (TREE_CHAIN (t) == 0
1073 && TYPE_MAIN_VARIANT (type) != void_type_node)
1075 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1079 if (c_type_promotes_to (type) != type)
1081 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1086 if (C_DECL_IMPLICIT (olddecl))
1087 error_with_decl (olddecl, "previous implicit declaration of `%s'");
1089 error_with_decl (olddecl, "previous declaration of `%s'");
1091 /* This is safer because the initializer might contain references
1092 to variables that were declared between olddecl and newdecl. This
1093 will make the initializer invalid for olddecl in case it gets
1094 assigned to olddecl below. */
1095 if (TREE_CODE (newdecl) == VAR_DECL)
1096 DECL_INITIAL (newdecl) = 0;
1098 /* TLS cannot follow non-TLS declaration. */
1099 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1100 && !DECL_THREAD_LOCAL (olddecl) && DECL_THREAD_LOCAL (newdecl))
1102 error_with_decl (newdecl, "thread-local declaration of `%s' follows non thread-local declaration");
1103 error_with_decl (olddecl, "previous declaration of `%s'");
1105 /* non-TLS declaration cannot follow TLS declaration. */
1106 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1107 && DECL_THREAD_LOCAL (olddecl) && !DECL_THREAD_LOCAL (newdecl))
1109 error_with_decl (newdecl, "non thread-local declaration of `%s' follows thread-local declaration");
1110 error_with_decl (olddecl, "previous declaration of `%s'");
1114 errmsg = redeclaration_error_message (newdecl, olddecl);
1120 error_with_decl (newdecl, "redefinition of `%s'");
1123 error_with_decl (newdecl, "redeclaration of `%s'");
1126 error_with_decl (newdecl, "conflicting declarations of `%s'");
1132 error_with_decl (olddecl,
1133 ((DECL_INITIAL (olddecl)
1134 && current_binding_level == global_binding_level)
1135 ? "`%s' previously defined here"
1136 : "`%s' previously declared here"));
1139 else if (TREE_CODE (newdecl) == TYPE_DECL
1140 && (DECL_IN_SYSTEM_HEADER (olddecl)
1141 || DECL_IN_SYSTEM_HEADER (newdecl)))
1143 warning_with_decl (newdecl, "redefinition of `%s'");
1146 ((DECL_INITIAL (olddecl)
1147 && current_binding_level == global_binding_level)
1148 ? "`%s' previously defined here"
1149 : "`%s' previously declared here"));
1151 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1152 && DECL_INITIAL (olddecl) != 0
1153 && TYPE_ARG_TYPES (oldtype) == 0
1154 && TYPE_ARG_TYPES (newtype) != 0
1155 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1159 /* Prototype decl follows defn w/o prototype. */
1161 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1162 type = TYPE_ARG_TYPES (newtype),
1165 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1167 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1168 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1170 warning_with_decl (newdecl, "prototype for `%s' follows");
1171 warning_with_decl (olddecl, "non-prototype definition here");
1174 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1175 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1177 error_with_decl (newdecl,
1178 "prototype for `%s' follows and number of arguments doesn't match");
1179 error_with_decl (olddecl, "non-prototype definition here");
1183 /* Type for passing arg must be consistent
1184 with that declared for the arg. */
1185 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)))
1187 error_with_decl (newdecl,
1188 "prototype for `%s' follows and argument %d doesn't match",
1190 error_with_decl (olddecl, "non-prototype definition here");
1196 /* Warn about mismatches in various flags. */
1199 /* Warn if function is now inline
1200 but was previously declared not inline and has been called. */
1201 if (TREE_CODE (olddecl) == FUNCTION_DECL
1202 && ! DECL_DECLARED_INLINE_P (olddecl)
1203 && DECL_DECLARED_INLINE_P (newdecl)
1204 && TREE_USED (olddecl))
1205 warning_with_decl (newdecl,
1206 "`%s' declared inline after being called");
1207 if (TREE_CODE (olddecl) == FUNCTION_DECL
1208 && ! DECL_DECLARED_INLINE_P (olddecl)
1209 && DECL_DECLARED_INLINE_P (newdecl)
1210 && DECL_INITIAL (olddecl) != 0)
1211 warning_with_decl (newdecl,
1212 "`%s' declared inline after its definition");
1214 /* If pedantic, warn when static declaration follows a non-static
1215 declaration. Otherwise, do so only for functions. */
1216 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1217 && TREE_PUBLIC (olddecl)
1218 && !TREE_PUBLIC (newdecl))
1219 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1221 /* If warn_traditional, warn when a non-static function
1222 declaration follows a static one. */
1223 if (warn_traditional && !in_system_header
1224 && TREE_CODE (olddecl) == FUNCTION_DECL
1225 && !TREE_PUBLIC (olddecl)
1226 && TREE_PUBLIC (newdecl))
1227 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1229 /* Warn when const declaration follows a non-const
1230 declaration, but not for functions. */
1231 if (TREE_CODE (olddecl) != FUNCTION_DECL
1232 && !TREE_READONLY (olddecl)
1233 && TREE_READONLY (newdecl))
1234 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1235 /* These bits are logically part of the type, for variables.
1236 But not for functions
1237 (where qualifiers are not valid ANSI anyway). */
1238 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1239 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1240 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1241 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1245 /* Optionally warn about more than one declaration for the same name. */
1246 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1247 /* Don't warn about a function declaration
1248 followed by a definition. */
1249 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1250 && DECL_INITIAL (olddecl) == 0)
1251 /* Don't warn about extern decl followed by (tentative) definition. */
1252 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1254 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1255 warning_with_decl (olddecl, "previous declaration of `%s'");
1258 /* Copy all the DECL_... slots specified in the new decl
1259 except for any that we copy here from the old type.
1261 Past this point, we don't change OLDTYPE and NEWTYPE
1262 even if we change the types of NEWDECL and OLDDECL. */
1266 /* When copying info to olddecl, we store into write_olddecl
1267 instead. This allows us to avoid modifying olddecl when
1268 different_binding_level is true. */
1269 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1271 /* Merge the data types specified in the two decls. */
1272 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1274 if (different_binding_level)
1276 if (TYPE_ARG_TYPES (oldtype) != 0
1277 && TYPE_ARG_TYPES (newtype) == 0)
1278 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1281 = build_type_attribute_variant
1283 merge_attributes (TYPE_ATTRIBUTES (newtype),
1284 TYPE_ATTRIBUTES (oldtype)));
1288 = TREE_TYPE (olddecl)
1289 = common_type (newtype, oldtype);
1292 /* Lay the type out, unless already done. */
1293 if (oldtype != TREE_TYPE (newdecl))
1295 if (TREE_TYPE (newdecl) != error_mark_node)
1296 layout_type (TREE_TYPE (newdecl));
1297 if (TREE_CODE (newdecl) != FUNCTION_DECL
1298 && TREE_CODE (newdecl) != TYPE_DECL
1299 && TREE_CODE (newdecl) != CONST_DECL)
1300 layout_decl (newdecl, 0);
1304 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1305 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1306 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1307 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1308 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1309 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1311 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1312 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1316 /* Keep the old rtl since we can safely use it. */
1317 COPY_DECL_RTL (olddecl, newdecl);
1319 /* Merge the type qualifiers. */
1320 if (TREE_READONLY (newdecl))
1321 TREE_READONLY (write_olddecl) = 1;
1323 if (TREE_THIS_VOLATILE (newdecl))
1325 TREE_THIS_VOLATILE (write_olddecl) = 1;
1326 if (TREE_CODE (newdecl) == VAR_DECL
1327 /* If an automatic variable is re-declared in the same
1328 function scope, but the old declaration was not
1329 volatile, make_var_volatile() would crash because the
1330 variable would have been assigned to a pseudo, not a
1331 MEM. Since this duplicate declaration is invalid
1332 anyway, we just skip the call. */
1334 make_var_volatile (newdecl);
1337 /* Keep source location of definition rather than declaration. */
1338 /* When called with different_binding_level set, keep the old
1339 information so that meaningful diagnostics can be given. */
1340 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1341 && ! different_binding_level)
1343 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1344 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1347 /* Merge the unused-warning information. */
1348 if (DECL_IN_SYSTEM_HEADER (olddecl))
1349 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1350 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1351 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1353 /* Merge the initialization information. */
1354 /* When called with different_binding_level set, don't copy over
1355 DECL_INITIAL, so that we don't accidentally change function
1356 declarations into function definitions. */
1357 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1358 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1360 /* Merge the section attribute.
1361 We want to issue an error if the sections conflict but that must be
1362 done later in decl_attributes since we are called before attributes
1364 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1365 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1367 /* Copy the assembler name.
1368 Currently, it can only be defined in the prototype. */
1369 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1371 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1373 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1374 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1375 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1376 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1377 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1378 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1379 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1380 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1381 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1384 /* If cannot merge, then use the new type and qualifiers,
1385 and don't preserve the old rtl. */
1386 else if (! different_binding_level)
1388 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1389 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1390 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1391 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1394 /* Merge the storage class information. */
1395 merge_weak (newdecl, olddecl);
1397 /* For functions, static overrides non-static. */
1398 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1400 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1401 /* This is since we don't automatically
1402 copy the attributes of NEWDECL into OLDDECL. */
1403 /* No need to worry about different_binding_level here because
1404 then TREE_PUBLIC (newdecl) was true. */
1405 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1406 /* If this clears `static', clear it in the identifier too. */
1407 if (! TREE_PUBLIC (olddecl))
1408 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1410 if (DECL_EXTERNAL (newdecl))
1412 if (! different_binding_level)
1414 /* Don't mess with these flags on local externs; they remain
1415 external even if there's a declaration at file scope which
1417 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1418 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1420 /* An extern decl does not override previous storage class. */
1421 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1422 if (! DECL_EXTERNAL (newdecl))
1423 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1427 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1428 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1431 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1433 /* If we're redefining a function previously defined as extern
1434 inline, make sure we emit debug info for the inline before we
1435 throw it away, in case it was inlined into a function that hasn't
1436 been written out yet. */
1437 if (new_is_definition && DECL_INITIAL (olddecl))
1439 if (TREE_USED (olddecl))
1440 (*debug_hooks->outlining_inline_function) (olddecl);
1442 /* The new defn must not be inline. */
1443 DECL_INLINE (newdecl) = 0;
1444 DECL_UNINLINABLE (newdecl) = 1;
1448 /* If either decl says `inline', this fn is inline,
1449 unless its definition was passed already. */
1450 if (DECL_DECLARED_INLINE_P (newdecl)
1451 || DECL_DECLARED_INLINE_P (olddecl))
1452 DECL_DECLARED_INLINE_P (newdecl) = 1;
1454 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1455 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1458 if (DECL_BUILT_IN (olddecl))
1460 /* Get rid of any built-in function if new arg types don't match it
1461 or if we have a function definition. */
1462 if (! types_match || new_is_definition)
1464 if (! different_binding_level)
1466 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1467 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1472 /* If redeclaring a builtin function, and not a definition,
1473 it stays built in. */
1474 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1475 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1479 /* Also preserve various other info from the definition. */
1480 if (! new_is_definition)
1482 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1483 /* When called with different_binding_level set, don't copy over
1484 DECL_INITIAL, so that we don't accidentally change function
1485 declarations into function definitions. */
1486 if (! different_binding_level)
1487 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1488 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1489 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1490 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
1491 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1493 /* Set DECL_INLINE on the declaration if we've got a body
1494 from which to instantiate. */
1495 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1497 DECL_INLINE (newdecl) = 1;
1498 DECL_ABSTRACT_ORIGIN (newdecl)
1499 = (different_binding_level
1500 ? DECL_ORIGIN (olddecl)
1501 : DECL_ABSTRACT_ORIGIN (olddecl));
1506 /* If a previous declaration said inline, mark the
1507 definition as inlinable. */
1508 if (DECL_DECLARED_INLINE_P (newdecl)
1509 && ! DECL_UNINLINABLE (newdecl))
1510 DECL_INLINE (newdecl) = 1;
1513 if (different_binding_level)
1516 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1517 But preserve OLDDECL's DECL_UID. */
1519 unsigned olddecl_uid = DECL_UID (olddecl);
1521 memcpy ((char *) olddecl + sizeof (struct tree_common),
1522 (char *) newdecl + sizeof (struct tree_common),
1523 sizeof (struct tree_decl) - sizeof (struct tree_common));
1524 DECL_UID (olddecl) = olddecl_uid;
1527 /* NEWDECL contains the merged attribute lists.
1528 Update OLDDECL to be the same. */
1529 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1534 /* Return any external DECL associated with ID, whether or not it is
1535 currently in scope. */
1537 any_external_decl (id)
1540 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1543 if (decl && TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1546 t = purpose_member (id, truly_local_externals);
1548 return TREE_VALUE (t);
1553 /* Record an external decl DECL. This only does something if a
1554 shadowing decl already exists. */
1556 record_external_decl (decl)
1559 tree name = DECL_NAME (decl);
1560 if (!IDENTIFIER_SYMBOL_VALUE (name))
1563 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1566 /* Check whether decl-node X shadows an existing declaration.
1567 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1568 which might be a NULL_TREE. */
1570 warn_if_shadowing (x, old)
1575 /* Nothing to shadow? */
1577 /* Shadow warnings not wanted? */
1579 /* No shadow warnings for internally generated vars. */
1580 || DECL_SOURCE_LINE (x) == 0
1581 /* No shadow warnings for vars made for inlining. */
1582 || DECL_FROM_INLINE (x)
1583 /* Don't warn about the parm names in function declarator
1584 within a function declarator.
1585 It would be nice to avoid warning in any function
1586 declarator in a declaration, as opposed to a definition,
1587 but there is no way to tell it's not a definition. */
1588 || (TREE_CODE (x) == PARM_DECL
1589 && current_binding_level->level_chain->parm_flag))
1592 name = IDENTIFIER_POINTER (DECL_NAME (x));
1594 if (TREE_CODE (old) == PARM_DECL)
1595 shadow_warning (SW_PARAM, name, old);
1596 else if (DECL_CONTEXT (old) == 0)
1597 shadow_warning (SW_GLOBAL, name, old);
1599 shadow_warning (SW_LOCAL, name, old);
1603 /* Subroutine of pushdecl.
1605 X is a TYPE_DECL for a typedef statement. Create a brand new
1606 ..._TYPE node (which will be just a variant of the existing
1607 ..._TYPE node with identical properties) and then install X
1608 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1610 The whole point here is to end up with a situation where each
1611 and every ..._TYPE node the compiler creates will be uniquely
1612 associated with AT MOST one node representing a typedef name.
1613 This way, even though the compiler substitutes corresponding
1614 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1615 early on, later parts of the compiler can always do the reverse
1616 translation and get back the corresponding typedef name. For
1619 typedef struct S MY_TYPE;
1622 Later parts of the compiler might only know that `object' was of
1623 type `struct S' if it were not for code just below. With this
1624 code however, later parts of the compiler see something like:
1626 struct S' == struct S
1627 typedef struct S' MY_TYPE;
1630 And they can then deduce (from the node for type struct S') that
1631 the original object declaration was:
1635 Being able to do this is important for proper support of protoize,
1636 and also for generating precise symbolic debugging information
1637 which takes full account of the programmer's (typedef) vocabulary.
1639 Obviously, we don't want to generate a duplicate ..._TYPE node if
1640 the TYPE_DECL node that we are now processing really represents a
1641 standard built-in type.
1643 Since all standard types are effectively declared at line zero
1644 in the source file, we can easily check to see if we are working
1645 on a standard type by checking the current value of lineno. */
1648 clone_underlying_type (x)
1651 if (DECL_SOURCE_LINE (x) == 0)
1653 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1654 TYPE_NAME (TREE_TYPE (x)) = x;
1656 else if (TREE_TYPE (x) != error_mark_node
1657 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1659 tree tt = TREE_TYPE (x);
1660 DECL_ORIGINAL_TYPE (x) = tt;
1661 tt = build_type_copy (tt);
1663 TREE_USED (tt) = TREE_USED (x);
1668 /* Record a decl-node X as belonging to the current lexical scope.
1669 Check for errors (such as an incompatible declaration for the same
1670 name already seen in the same scope).
1672 Returns either X or an old decl for the same name.
1673 If an old decl is returned, it may have been smashed
1674 to agree with what X says. */
1680 tree name = DECL_NAME (x);
1681 struct binding_level *scope = current_binding_level;
1683 #ifdef ENABLE_CHECKING
1684 if (error_mark_node == 0)
1685 /* Called too early. */
1689 /* Functions need the lang_decl data. */
1690 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1691 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
1692 ggc_alloc_cleared (sizeof (struct lang_decl));
1694 /* A local extern declaration for a function doesn't constitute nesting.
1695 A local auto declaration does, since it's a forward decl
1696 for a nested function coming later. */
1697 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1698 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
1699 DECL_CONTEXT (x) = 0;
1701 DECL_CONTEXT (x) = current_function_decl;
1707 if (warn_nested_externs
1708 && scope != global_binding_level
1709 && DECL_EXTERNAL (x)
1710 && !DECL_IN_SYSTEM_HEADER (x))
1711 warning ("nested extern declaration of `%s'",
1712 IDENTIFIER_POINTER (name));
1714 old = lookup_name_current_level (name);
1715 if (old && duplicate_decls (x, old, 0))
1717 if (DECL_EXTERNAL (x) || scope == global_binding_level)
1719 /* Find and check against a previous, not-in-scope, external
1720 decl for this identifier. (C99 s???: If two declarations
1721 with external linkage, referring to the same object, have
1722 incompatible types, the behavior is undefined). */
1723 tree ext = any_external_decl (name);
1726 if (duplicate_decls (x, ext, scope != global_binding_level))
1727 x = copy_node (ext);
1730 record_external_decl (x);
1733 if (TREE_CODE (x) == TYPE_DECL)
1734 clone_underlying_type (x);
1736 /* If storing a local value, there may already be one
1737 (inherited). If so, record it for restoration when this
1738 binding level ends. Take care not to do this if we are
1739 replacing an older decl in the same binding level (i.e.
1740 duplicate_decls returned false, above). */
1741 if (scope != global_binding_level
1742 && IDENTIFIER_SYMBOL_VALUE (name)
1743 && IDENTIFIER_SYMBOL_VALUE (name) != old)
1745 warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
1746 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1750 /* Install the new declaration in the requested binding level. */
1751 IDENTIFIER_SYMBOL_VALUE (name) = x;
1752 C_DECL_INVISIBLE (x) = 0;
1754 /* Keep list of variables in this level with incomplete type.
1755 If the input is erroneous, we can have error_mark in the type
1756 slot (e.g. "f(void a, ...)") - that doesn't count as an
1758 if (TREE_TYPE (x) != error_mark_node
1759 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1761 tree element = TREE_TYPE (x);
1763 while (TREE_CODE (element) == ARRAY_TYPE)
1764 element = TREE_TYPE (element);
1765 if (TREE_CODE (element) == RECORD_TYPE
1766 || TREE_CODE (element) == UNION_TYPE)
1767 scope->incomplete_list = tree_cons (NULL_TREE, x,
1768 scope->incomplete_list);
1772 /* Put decls on list in reverse order.
1773 We will reverse them later if necessary. */
1774 TREE_CHAIN (x) = scope->names;
1780 /* Record X as belonging to the global scope (C99 "file scope").
1781 This is used only internally by the Objective C front end,
1782 and is limited to its needs. It will hork if there is _any_
1783 visible binding for X (not just a global one). */
1785 pushdecl_top_level (x)
1790 if (TREE_CODE (x) != VAR_DECL)
1793 name = DECL_NAME (x);
1794 old = IDENTIFIER_SYMBOL_VALUE (name);
1798 if (DECL_CONTEXT (old))
1801 if (!duplicate_decls (x, old, 0))
1807 DECL_CONTEXT (x) = 0;
1808 IDENTIFIER_SYMBOL_VALUE (name) = x;
1809 TREE_CHAIN (x) = global_binding_level->names;
1810 global_binding_level->names = x;
1814 /* Record X as belonging to the outermost scope of the current
1815 function. This is used only internally, by c_make_fname_decl and
1816 build_external_ref, and is limited to their needs. The NAME is
1817 provided as a separate argument because build_external_ref wants to
1818 use error_mark_node for X. For VAR_DECLs, duplicate_decls is not
1819 called; if there is any preexisting decl for this identifier, it is
1822 pushdecl_function_level (x, name)
1826 struct binding_level *scope;
1828 scope = current_binding_level;
1829 while (scope->function_body == 0)
1830 scope = scope->level_chain;
1834 if (x == error_mark_node)
1835 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1837 else if (TREE_CODE (x) == VAR_DECL)
1839 if (name != DECL_NAME (x))
1841 if (IDENTIFIER_SYMBOL_VALUE (name))
1844 DECL_CONTEXT (x) = current_function_decl;
1845 TREE_CHAIN (x) = scope->names;
1849 IDENTIFIER_SYMBOL_VALUE (name) = x;
1853 /* Generate an implicit declaration for identifier FUNCTIONID as a
1854 function of type int (). */
1857 implicitly_declare (functionid)
1860 tree decl = any_external_decl (functionid);
1862 if (decl && decl != error_mark_node)
1864 /* Implicit declaration of a function already declared
1865 (somehow) in a different scope, or as a built-in.
1866 If this is the first time this has happened, warn;
1867 then recycle the old declaration. */
1868 if (!C_DECL_IMPLICIT (decl))
1870 implicit_decl_warning (DECL_NAME (decl));
1871 if (DECL_CONTEXT (decl))
1872 warning_with_decl (decl, "previous declaration of `%s'");
1873 C_DECL_IMPLICIT (decl) = 1;
1875 /* If this function is global, then it must already be in the
1876 global binding level, so there's no need to push it again. */
1877 if (current_binding_level == global_binding_level)
1879 /* If this is a local declaration, make a copy; we can't have
1880 the same DECL listed in two different binding levels. */
1881 return pushdecl (copy_node (decl));
1884 /* Not seen before. */
1885 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1886 DECL_EXTERNAL (decl) = 1;
1887 TREE_PUBLIC (decl) = 1;
1888 C_DECL_IMPLICIT (decl) = 1;
1889 implicit_decl_warning (functionid);
1891 /* ANSI standard says implicit declarations are in the innermost block.
1892 So we record the decl in the standard fashion. */
1893 decl = pushdecl (decl);
1895 /* No need to call objc_check_decl here - it's a function type. */
1896 rest_of_decl_compilation (decl, NULL, 0, 0);
1898 /* Write a record describing this implicit function declaration to the
1899 prototypes file (if requested). */
1901 gen_aux_info_record (decl, 0, 1, 0);
1903 /* Possibly apply some default attributes to this implicit declaration. */
1904 decl_attributes (&decl, NULL_TREE, 0);
1910 implicit_decl_warning (id)
1913 const char *name = IDENTIFIER_POINTER (id);
1914 if (mesg_implicit_function_declaration == 2)
1915 error ("implicit declaration of function `%s'", name);
1916 else if (mesg_implicit_function_declaration == 1)
1917 warning ("implicit declaration of function `%s'", name);
1920 /* Return zero if the declaration NEWDECL is valid
1921 when the declaration OLDDECL (assumed to be for the same name)
1922 has already been seen.
1923 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
1924 and 3 if it is a conflicting declaration. */
1927 redeclaration_error_message (newdecl, olddecl)
1928 tree newdecl, olddecl;
1930 if (TREE_CODE (newdecl) == TYPE_DECL)
1932 /* Do not complain about type redeclarations where at least one
1933 declaration was in a system header. */
1934 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
1938 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1940 /* Declarations of functions can insist on internal linkage
1941 but they can't be inconsistent with internal linkage,
1942 so there can be no error on that account.
1943 However defining the same name twice is no good. */
1944 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
1945 /* However, defining once as extern inline and a second
1946 time in another way is ok. */
1947 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
1948 && ! (DECL_DECLARED_INLINE_P (newdecl)
1949 && DECL_EXTERNAL (newdecl))))
1953 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
1955 /* Objects declared at top level: */
1956 /* If at least one is a reference, it's ok. */
1957 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
1959 /* Reject two definitions. */
1960 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
1962 /* Now we have two tentative defs, or one tentative and one real def. */
1963 /* Insist that the linkage match. */
1964 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
1968 else if (current_binding_level->parm_flag
1969 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1973 /* Newdecl has block scope. If olddecl has block scope also, then
1974 reject two definitions, and reject a definition together with an
1975 external reference. Otherwise, it is OK, because newdecl must
1976 be an extern reference to olddecl. */
1977 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
1978 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
1984 /* Get the LABEL_DECL corresponding to identifier ID as a label.
1985 Create one if none exists so far for the current function.
1986 This function is called for both label definitions and label references. */
1992 tree decl = IDENTIFIER_LABEL_VALUE (id);
1994 if (current_function_decl == 0)
1996 error ("label %s referenced outside of any function",
1997 IDENTIFIER_POINTER (id));
2001 /* Use a label already defined or ref'd with this name. */
2004 /* But not if it is inherited and wasn't declared to be inheritable. */
2005 if (DECL_CONTEXT (decl) != current_function_decl
2006 && ! C_DECLARED_LABEL_FLAG (decl))
2007 return shadow_label (id);
2011 decl = build_decl (LABEL_DECL, id, void_type_node);
2013 /* A label not explicitly declared must be local to where it's ref'd. */
2014 DECL_CONTEXT (decl) = current_function_decl;
2016 DECL_MODE (decl) = VOIDmode;
2018 /* Say where one reference is to the label,
2019 for the sake of the error if it is not defined. */
2020 DECL_SOURCE_LOCATION (decl) = input_location;
2022 IDENTIFIER_LABEL_VALUE (id) = decl;
2024 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2029 /* Make a label named NAME in the current function,
2030 shadowing silently any that may be inherited from containing functions
2031 or containing scopes.
2033 Note that valid use, if the label being shadowed
2034 comes from another scope in the same function,
2035 requires calling declare_nonlocal_label right away. */
2041 tree decl = IDENTIFIER_LABEL_VALUE (name);
2047 /* Check to make sure that the label hasn't already been declared
2048 at this label scope */
2049 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2050 if (TREE_VALUE (dup) == decl)
2052 error ("duplicate label declaration `%s'",
2053 IDENTIFIER_POINTER (name));
2054 error_with_decl (TREE_VALUE (dup),
2055 "this is a previous declaration");
2056 /* Just use the previous declaration. */
2057 return lookup_label (name);
2060 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2061 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2064 return lookup_label (name);
2067 /* Define a label, specifying the location in the source file.
2068 Return the LABEL_DECL node for the label, if the definition is valid.
2069 Otherwise return 0. */
2072 define_label (const char* filename, int line, tree name)
2075 tree decl = lookup_label (name);
2076 locus.file = filename;
2079 /* If label with this name is known from an outer context, shadow it. */
2080 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2082 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2083 IDENTIFIER_LABEL_VALUE (name) = 0;
2084 decl = lookup_label (name);
2087 if (warn_traditional && !in_system_header && lookup_name (name))
2088 warning ("%Htraditional C lacks a separate namespace for labels, "
2089 "identifier `%s' conflicts", &locus, IDENTIFIER_POINTER (name));
2091 if (DECL_INITIAL (decl) != 0)
2093 error ("%Hduplicate label `%s'", &locus, IDENTIFIER_POINTER (name));
2098 /* Mark label as having been defined. */
2099 DECL_INITIAL (decl) = error_mark_node;
2100 /* Say where in the source. */
2101 DECL_SOURCE_LOCATION (decl) = locus;
2106 /* Return the list of declarations of the current level.
2107 Note that this list is in reverse order unless/until
2108 you nreverse it; and when you do nreverse it, you must
2109 store the result back using `storedecls' or you will lose. */
2114 return current_binding_level->names;
2117 /* Return the list of type-tags (for structs, etc) of the current level. */
2122 return current_binding_level->tags;
2125 /* Store the list of declarations of the current level.
2126 This is done for the parameter declarations of a function being defined,
2127 after they are modified in the light of any missing parameters. */
2133 current_binding_level->names = decls;
2136 /* Similarly, store the list of tags of the current level. */
2142 current_binding_level->tags = tags;
2145 /* Given NAME, an IDENTIFIER_NODE,
2146 return the structure (or union or enum) definition for that name.
2147 If THISLEVEL_ONLY is nonzero, searches only the current_binding_level.
2148 CODE says which kind of type the caller wants;
2149 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2150 If the wrong kind of type is found, an error is reported. */
2153 lookup_tag (code, name, thislevel_only)
2154 enum tree_code code;
2158 tree tag = IDENTIFIER_TAG_VALUE (name);
2164 /* We only care about whether it's in this level if
2165 thislevel_only was set or it might be a type clash. */
2166 if (thislevel_only || TREE_CODE (tag) != code)
2168 if (current_binding_level == global_binding_level
2169 || purpose_member (name, current_binding_level->tags))
2173 if (thislevel_only && !thislevel)
2176 if (TREE_CODE (tag) != code)
2178 /* Definition isn't the kind we were looking for. */
2179 pending_invalid_xref = name;
2180 pending_invalid_xref_location = input_location;
2182 /* If in the same binding level as a declaration as a tag
2183 of a different type, this must not be allowed to
2184 shadow that tag, so give the error immediately.
2185 (For example, "struct foo; union foo;" is invalid.) */
2187 pending_xref_error ();
2192 /* Print an error message now
2193 for a recent invalid struct, union or enum cross reference.
2194 We don't print them immediately because they are not invalid
2195 when used in the `struct foo;' construct for shadowing. */
2198 pending_xref_error ()
2200 if (pending_invalid_xref != 0)
2201 error ("%H`%s' defined as wrong kind of tag",
2202 &pending_invalid_xref_location,
2203 IDENTIFIER_POINTER (pending_invalid_xref));
2204 pending_invalid_xref = 0;
2208 /* Look up NAME in the current binding level and its superiors
2209 in the namespace of variables, functions and typedefs.
2210 Return a ..._DECL node of some kind representing its definition,
2211 or return 0 if it is undefined. */
2217 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2218 if (decl == 0 || decl == error_mark_node)
2220 if (C_DECL_INVISIBLE (decl))
2225 /* Similar to `lookup_name' but look only at the current binding level. */
2228 lookup_name_current_level (name)
2231 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2233 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2236 if (current_binding_level == global_binding_level)
2239 /* Scan the current scope for a decl with name NAME. */
2240 if (chain_member (decl, current_binding_level->names))
2246 /* Create the predefined scalar types of C,
2247 and some nodes representing standard constants (0, 1, (void *) 0).
2248 Initialize the global binding level.
2249 Make definitions for built-in primitive functions. */
2252 c_init_decl_processing ()
2255 tree ptr_ftype_void, ptr_ftype_ptr;
2257 /* Adds some ggc roots, and reserved words for c-parse.in. */
2260 current_function_decl = NULL;
2261 named_labels = NULL;
2262 current_binding_level = NULL_BINDING_LEVEL;
2263 free_binding_level = NULL_BINDING_LEVEL;
2265 /* Make the binding_level structure for global names. */
2267 global_binding_level = current_binding_level;
2269 build_common_tree_nodes (flag_signed_char);
2271 c_common_nodes_and_builtins ();
2273 boolean_type_node = integer_type_node;
2274 boolean_true_node = integer_one_node;
2275 boolean_false_node = integer_zero_node;
2277 c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
2278 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2279 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2280 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2281 TYPE_PRECISION (c_bool_type_node) = 1;
2282 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2284 c_bool_false_node = build_int_2 (0, 0);
2285 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2286 c_bool_true_node = build_int_2 (1, 0);
2287 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2289 endlink = void_list_node;
2290 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2292 = build_function_type (ptr_type_node,
2293 tree_cons (NULL_TREE, ptr_type_node, endlink));
2295 pedantic_lvalues = pedantic;
2297 make_fname_decl = c_make_fname_decl;
2298 start_fname_decls ();
2301 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2302 decl, NAME is the initialization string and TYPE_DEP indicates whether
2303 NAME depended on the type of the function. As we don't yet implement
2304 delayed emission of static data, we mark the decl as emitted
2305 so it is not placed in the output. Anything using it must therefore pull
2306 out the STRING_CST initializer directly. This does mean that these names
2307 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2310 c_make_fname_decl (id, type_dep)
2314 const char *name = fname_as_string (type_dep);
2315 tree decl, type, init;
2316 size_t length = strlen (name);
2318 type = build_array_type
2319 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2320 build_index_type (size_int (length)));
2322 decl = build_decl (VAR_DECL, id, type);
2324 TREE_STATIC (decl) = 1;
2325 TREE_READONLY (decl) = 1;
2326 DECL_ARTIFICIAL (decl) = 1;
2328 init = build_string (length + 1, name);
2329 TREE_TYPE (init) = type;
2330 DECL_INITIAL (decl) = init;
2332 TREE_USED (decl) = 1;
2334 if (current_function_decl)
2335 pushdecl_function_level (decl, DECL_NAME (decl));
2337 finish_decl (decl, init, NULL_TREE);
2342 /* Return a definition for a builtin function named NAME and whose data type
2343 is TYPE. TYPE should be a function type with argument types.
2344 FUNCTION_CODE tells later passes how to compile calls to this function.
2345 See tree.h for its possible values.
2347 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2348 the name to be called if we can't opencode the function. If
2349 ATTRS is nonzero, use that for the function's attribute list. */
2352 builtin_function (name, type, function_code, class, library_name, attrs)
2356 enum built_in_class class;
2357 const char *library_name;
2360 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2361 DECL_EXTERNAL (decl) = 1;
2362 TREE_PUBLIC (decl) = 1;
2364 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2365 make_decl_rtl (decl, NULL);
2367 DECL_BUILT_IN_CLASS (decl) = class;
2368 DECL_FUNCTION_CODE (decl) = function_code;
2370 /* Warn if a function in the namespace for users
2371 is used without an occasion to consider it declared. */
2372 if (name[0] != '_' || name[1] != '_')
2373 C_DECL_INVISIBLE (decl) = 1;
2375 /* Possibly apply some default attributes to this built-in function. */
2377 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2379 decl_attributes (&decl, NULL_TREE, 0);
2384 /* Apply default attributes to a function, if a system function with default
2388 c_insert_default_attributes (decl)
2391 if (!TREE_PUBLIC (decl))
2393 c_common_insert_default_attributes (decl);
2396 /* Called when a declaration is seen that contains no names to declare.
2397 If its type is a reference to a structure, union or enum inherited
2398 from a containing scope, shadow that tag name for the current scope
2399 with a forward reference.
2400 If its type defines a new named structure or union
2401 or defines an enum, it is valid but we need not do anything here.
2402 Otherwise, it is an error. */
2405 shadow_tag (declspecs)
2408 shadow_tag_warned (declspecs, 0);
2412 shadow_tag_warned (declspecs, warned)
2415 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2422 pending_invalid_xref = 0;
2424 /* Remove the attributes from declspecs, since they will confuse the
2426 split_specs_attrs (declspecs, &specs, &attrs);
2428 for (link = specs; link; link = TREE_CHAIN (link))
2430 tree value = TREE_VALUE (link);
2431 enum tree_code code = TREE_CODE (value);
2433 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2434 /* Used to test also that TYPE_SIZE (value) != 0.
2435 That caused warning for `struct foo;' at top level in the file. */
2437 tree name = TYPE_NAME (value);
2444 if (warned != 1 && code != ENUMERAL_TYPE)
2445 /* Empty unnamed enum OK */
2447 pedwarn ("unnamed struct/union that defines no instances");
2453 t = lookup_tag (code, name, 1);
2457 t = make_node (code);
2464 if (!warned && ! in_system_header)
2466 warning ("useless keyword or type name in empty declaration");
2473 error ("two types specified in one empty declaration");
2478 pedwarn ("empty declaration");
2482 /* Construct an array declarator. EXPR is the expression inside [], or
2483 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2484 to the pointer to which a parameter array is converted). STATIC_P is
2485 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2486 is nonzero is the array is [*], a VLA of unspecified length which is
2487 nevertheless a complete type (not currently implemented by GCC),
2488 zero otherwise. The declarator is constructed as an ARRAY_REF
2489 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2490 left of the [] (filled by in set_array_declarator_type) and operand 1
2491 is the expression inside; whose TREE_TYPE is the type qualifiers and
2492 which has TREE_STATIC set if "static" is used. */
2495 build_array_declarator (expr, quals, static_p, vla_unspec_p)
2502 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2503 TREE_TYPE (decl) = quals;
2504 TREE_STATIC (decl) = (static_p ? 1 : 0);
2505 if (pedantic && !flag_isoc99)
2507 if (static_p || quals != NULL_TREE)
2508 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2510 pedwarn ("ISO C90 does not support `[*]' array declarators");
2513 warning ("GCC does not yet properly implement `[*]' array declarators");
2517 /* Set the type of an array declarator. DECL is the declarator, as
2518 constructed by build_array_declarator; TYPE is what appears on the left
2519 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2520 abstract declarator, zero otherwise; this is used to reject static and
2521 type qualifiers in abstract declarators, where they are not in the
2525 set_array_declarator_type (decl, type, abstract_p)
2530 TREE_OPERAND (decl, 0) = type;
2531 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2532 error ("static or type qualifiers in abstract declarator");
2536 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2539 groktypename (typename)
2544 if (TREE_CODE (typename) != TREE_LIST)
2547 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2549 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
2551 /* Apply attributes. */
2552 decl_attributes (&typename, attrs, 0);
2557 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2560 groktypename_in_parm_context (typename)
2563 if (TREE_CODE (typename) != TREE_LIST)
2565 return grokdeclarator (TREE_VALUE (typename),
2566 TREE_PURPOSE (typename),
2570 /* Decode a declarator in an ordinary declaration or data definition.
2571 This is called as soon as the type information and variable name
2572 have been parsed, before parsing the initializer if any.
2573 Here we create the ..._DECL node, fill in its type,
2574 and put it on the list of decls for the current context.
2575 The ..._DECL node is returned as the value.
2577 Exception: for arrays where the length is not specified,
2578 the type is left null, to be filled in by `finish_decl'.
2580 Function definitions do not come here; they go to start_function
2581 instead. However, external and forward declarations of functions
2582 do go through here. Structure field declarations are done by
2583 grokfield and not through here. */
2586 start_decl (declarator, declspecs, initialized, attributes)
2587 tree declarator, declspecs;
2594 /* An object declared as __attribute__((deprecated)) suppresses
2595 warnings of uses of other deprecated items. */
2596 if (lookup_attribute ("deprecated", attributes))
2597 deprecated_state = DEPRECATED_SUPPRESS;
2599 decl = grokdeclarator (declarator, declspecs,
2600 NORMAL, initialized);
2602 deprecated_state = DEPRECATED_NORMAL;
2604 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2605 && MAIN_NAME_P (DECL_NAME (decl)))
2606 warning_with_decl (decl, "`%s' is usually a function");
2609 /* Is it valid for this decl to have an initializer at all?
2610 If not, set INITIALIZED to zero, which will indirectly
2611 tell `finish_decl' to ignore the initializer once it is parsed. */
2612 switch (TREE_CODE (decl))
2615 error ("typedef `%s' is initialized (use __typeof__ instead)",
2616 IDENTIFIER_POINTER (DECL_NAME (decl)));
2621 error ("function `%s' is initialized like a variable",
2622 IDENTIFIER_POINTER (DECL_NAME (decl)));
2627 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2628 error ("parameter `%s' is initialized",
2629 IDENTIFIER_POINTER (DECL_NAME (decl)));
2634 /* Don't allow initializations for incomplete types
2635 except for arrays which might be completed by the initialization. */
2637 /* This can happen if the array size is an undefined macro. We already
2638 gave a warning, so we don't need another one. */
2639 if (TREE_TYPE (decl) == error_mark_node)
2641 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2643 /* A complete type is ok if size is fixed. */
2645 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2646 || C_DECL_VARIABLE_SIZE (decl))
2648 error ("variable-sized object may not be initialized");
2652 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2654 error ("variable `%s' has initializer but incomplete type",
2655 IDENTIFIER_POINTER (DECL_NAME (decl)));
2658 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2660 error ("elements of array `%s' have incomplete type",
2661 IDENTIFIER_POINTER (DECL_NAME (decl)));
2669 /* Seems redundant with grokdeclarator. */
2670 if (current_binding_level != global_binding_level
2671 && DECL_EXTERNAL (decl)
2672 && TREE_CODE (decl) != FUNCTION_DECL)
2673 warning ("declaration of `%s' has `extern' and is initialized",
2674 IDENTIFIER_POINTER (DECL_NAME (decl)));
2676 DECL_EXTERNAL (decl) = 0;
2677 if (current_binding_level == global_binding_level)
2678 TREE_STATIC (decl) = 1;
2680 /* Tell `pushdecl' this is an initialized decl
2681 even though we don't yet have the initializer expression.
2682 Also tell `finish_decl' it may store the real initializer. */
2683 DECL_INITIAL (decl) = error_mark_node;
2686 /* If this is a function declaration, write a record describing it to the
2687 prototypes file (if requested). */
2689 if (TREE_CODE (decl) == FUNCTION_DECL)
2690 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2692 /* ANSI specifies that a tentative definition which is not merged with
2693 a non-tentative definition behaves exactly like a definition with an
2694 initializer equal to zero. (Section 3.7.2)
2696 -fno-common gives strict ANSI behavior, though this tends to break
2697 a large body of code that grew up without this rule.
2699 Thread-local variables are never common, since there's no entrenched
2700 body of code to break, and it allows more efficient variable references
2701 in the presence of dynamic linking. */
2703 if (TREE_CODE (decl) == VAR_DECL
2705 && TREE_PUBLIC (decl)
2706 && !DECL_THREAD_LOCAL (decl)
2708 DECL_COMMON (decl) = 1;
2710 /* Set attributes here so if duplicate decl, will have proper attributes. */
2711 decl_attributes (&decl, attributes, 0);
2713 /* If #pragma weak was used, mark the decl weak now. */
2714 if (current_binding_level == global_binding_level)
2715 maybe_apply_pragma_weak (decl);
2717 if (TREE_CODE (decl) == FUNCTION_DECL
2718 && DECL_DECLARED_INLINE_P (decl)
2719 && DECL_UNINLINABLE (decl)
2720 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2721 warning_with_decl (decl,
2722 "inline function `%s' given attribute noinline");
2724 /* Add this decl to the current binding level.
2725 TEM may equal DECL or it may be a previous decl of the same name. */
2726 tem = pushdecl (decl);
2728 /* For a local variable, define the RTL now. */
2729 if (current_binding_level != global_binding_level
2730 /* But not if this is a duplicate decl
2731 and we preserved the rtl from the previous one
2732 (which may or may not happen). */
2733 && !DECL_RTL_SET_P (tem)
2734 && !DECL_CONTEXT (tem))
2736 if (TREE_TYPE (tem) != error_mark_node
2737 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
2739 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2740 && DECL_INITIAL (tem) != 0)
2747 /* Finish processing of a declaration;
2748 install its initial value.
2749 If the length of an array type is not known before,
2750 it must be determined now, from the initial value, or it is an error. */
2753 finish_decl (decl, init, asmspec_tree)
2757 tree type = TREE_TYPE (decl);
2758 int was_incomplete = (DECL_SIZE (decl) == 0);
2759 const char *asmspec = 0;
2761 /* If a name was specified, get the string. */
2762 if (current_binding_level == global_binding_level)
2763 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2765 asmspec = TREE_STRING_POINTER (asmspec_tree);
2767 /* If `start_decl' didn't like having an initialization, ignore it now. */
2768 if (init != 0 && DECL_INITIAL (decl) == 0)
2771 /* Don't crash if parm is initialized. */
2772 if (TREE_CODE (decl) == PARM_DECL)
2776 store_init_value (decl, init);
2778 /* Deduce size of array from initialization, if not already known */
2779 if (TREE_CODE (type) == ARRAY_TYPE
2780 && TYPE_DOMAIN (type) == 0
2781 && TREE_CODE (decl) != TYPE_DECL)
2784 = (TREE_STATIC (decl)
2785 /* Even if pedantic, an external linkage array
2786 may have incomplete type at first. */
2787 ? pedantic && !TREE_PUBLIC (decl)
2788 : !DECL_EXTERNAL (decl));
2790 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2792 /* Get the completed type made by complete_array_type. */
2793 type = TREE_TYPE (decl);
2796 error_with_decl (decl, "initializer fails to determine size of `%s'");
2798 else if (failure == 2)
2801 error_with_decl (decl, "array size missing in `%s'");
2802 /* If a `static' var's size isn't known,
2803 make it extern as well as static, so it does not get
2805 If it is not `static', then do not mark extern;
2806 finish_incomplete_decl will give it a default size
2807 and it will get allocated. */
2808 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2809 DECL_EXTERNAL (decl) = 1;
2812 /* TYPE_MAX_VALUE is always one less than the number of elements
2813 in the array, because we start counting at zero. Therefore,
2814 warn only if the value is less than zero. */
2815 else if (pedantic && TYPE_DOMAIN (type) != 0
2816 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2817 error_with_decl (decl, "zero or negative size array `%s'");
2819 layout_decl (decl, 0);
2822 if (TREE_CODE (decl) == VAR_DECL)
2824 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2825 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2826 layout_decl (decl, 0);
2828 if (DECL_SIZE (decl) == 0
2829 /* Don't give an error if we already gave one earlier. */
2830 && TREE_TYPE (decl) != error_mark_node
2831 && (TREE_STATIC (decl)
2833 /* A static variable with an incomplete type
2834 is an error if it is initialized.
2835 Also if it is not file scope.
2836 Otherwise, let it through, but if it is not `extern'
2837 then it may cause an error message later. */
2838 (DECL_INITIAL (decl) != 0
2839 || DECL_CONTEXT (decl) != 0)
2841 /* An automatic variable with an incomplete type
2843 !DECL_EXTERNAL (decl)))
2845 error_with_decl (decl, "storage size of `%s' isn't known");
2846 TREE_TYPE (decl) = error_mark_node;
2849 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2850 && DECL_SIZE (decl) != 0)
2852 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2853 constant_expression_warning (DECL_SIZE (decl));
2855 error_with_decl (decl, "storage size of `%s' isn't constant");
2858 if (TREE_USED (type))
2859 TREE_USED (decl) = 1;
2862 /* If this is a function and an assembler name is specified, reset DECL_RTL
2863 so we can give it its new name. Also, update built_in_decls if it
2864 was a normal built-in. */
2865 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2867 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2869 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2870 SET_DECL_RTL (builtin, NULL_RTX);
2871 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (asmspec));
2872 #ifdef TARGET_MEM_FUNCTIONS
2873 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2874 init_block_move_fn (asmspec);
2875 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2876 init_block_clear_fn (asmspec);
2878 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2879 init_block_move_fn (asmspec);
2880 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2881 init_block_clear_fn (asmspec);
2884 SET_DECL_RTL (decl, NULL_RTX);
2885 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
2888 /* Output the assembler code and/or RTL code for variables and functions,
2889 unless the type is an undefined structure or union.
2890 If not, it will get done when the type is completed. */
2892 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2894 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2896 objc_check_decl (decl);
2898 if (!DECL_CONTEXT (decl))
2900 if (DECL_INITIAL (decl) == NULL_TREE
2901 || DECL_INITIAL (decl) == error_mark_node)
2902 /* Don't output anything
2903 when a tentative file-scope definition is seen.
2904 But at end of compilation, do output code for them. */
2905 DECL_DEFER_OUTPUT (decl) = 1;
2906 rest_of_decl_compilation (decl, asmspec,
2907 (DECL_CONTEXT (decl) == 0
2908 || TREE_ASM_WRITTEN (decl)), 0);
2912 /* This is a local variable. If there is an ASMSPEC, the
2913 user has requested that we handle it specially. */
2916 /* In conjunction with an ASMSPEC, the `register'
2917 keyword indicates that we should place the variable
2918 in a particular register. */
2919 if (DECL_REGISTER (decl))
2920 DECL_C_HARD_REGISTER (decl) = 1;
2922 /* If this is not a static variable, issue a warning.
2923 It doesn't make any sense to give an ASMSPEC for an
2924 ordinary, non-register local variable. Historically,
2925 GCC has accepted -- but ignored -- the ASMSPEC in
2927 if (TREE_CODE (decl) == VAR_DECL
2928 && !DECL_REGISTER (decl)
2929 && !TREE_STATIC (decl))
2930 warning_with_decl (decl,
2931 "ignoring asm-specifier for non-static local variable `%s'");
2933 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
2936 if (TREE_CODE (decl) != FUNCTION_DECL)
2937 add_decl_stmt (decl);
2940 if (DECL_CONTEXT (decl) != 0)
2942 /* Recompute the RTL of a local array now
2943 if it used to be an incomplete type. */
2945 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2947 /* If we used it already as memory, it must stay in memory. */
2948 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2949 /* If it's still incomplete now, no init will save it. */
2950 if (DECL_SIZE (decl) == 0)
2951 DECL_INITIAL (decl) = 0;
2956 if (TREE_CODE (decl) == TYPE_DECL)
2958 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2960 objc_check_decl (decl);
2961 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
2964 /* At the end of a declaration, throw away any variable type sizes
2965 of types defined inside that declaration. There is no use
2966 computing them in the following function definition. */
2967 if (current_binding_level == global_binding_level)
2968 get_pending_sizes ();
2971 /* Given a parsed parameter declaration,
2972 decode it into a PARM_DECL and push that on the current binding level.
2973 Also, for the sake of forward parm decls,
2974 record the given order of parms in `parm_order'. */
2977 push_parm_decl (parm)
2981 int old_immediate_size_expand = immediate_size_expand;
2982 /* Don't try computing parm sizes now -- wait till fn is called. */
2983 immediate_size_expand = 0;
2985 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
2986 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
2987 decl_attributes (&decl, TREE_VALUE (parm), 0);
2990 if (DECL_NAME (decl))
2993 olddecl = lookup_name (DECL_NAME (decl));
2994 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
2995 pedwarn_with_decl (decl,
2996 "ISO C forbids parameter `%s' shadowing typedef");
3000 decl = pushdecl (decl);
3002 immediate_size_expand = old_immediate_size_expand;
3004 current_binding_level->parm_order
3005 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3007 /* Add this decl to the current binding level. */
3008 finish_decl (decl, NULL_TREE, NULL_TREE);
3011 /* Clear the given order of parms in `parm_order'.
3012 Used at start of parm list,
3013 and also at semicolon terminating forward decls. */
3018 current_binding_level->parm_order = NULL_TREE;
3021 static GTY(()) int compound_literal_number;
3023 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3024 literal, which may be an incomplete array type completed by the
3025 initializer; INIT is a CONSTRUCTOR that initializes the compound
3029 build_compound_literal (type, init)
3033 /* We do not use start_decl here because we have a type, not a declarator;
3034 and do not use finish_decl because the decl should be stored inside
3035 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3036 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3039 DECL_EXTERNAL (decl) = 0;
3040 TREE_PUBLIC (decl) = 0;
3041 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3042 DECL_CONTEXT (decl) = current_function_decl;
3043 TREE_USED (decl) = 1;
3044 TREE_TYPE (decl) = type;
3045 TREE_READONLY (decl) = TREE_READONLY (type);
3046 store_init_value (decl, init);
3048 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3050 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3055 type = TREE_TYPE (decl);
3056 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3057 return error_mark_node;
3059 stmt = build_stmt (DECL_STMT, decl);
3060 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3061 TREE_SIDE_EFFECTS (complit) = 1;
3063 layout_decl (decl, 0);
3065 if (TREE_STATIC (decl))
3067 /* This decl needs a name for the assembler output. We also need
3068 a unique suffix to be added to the name. */
3071 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3072 compound_literal_number);
3073 compound_literal_number++;
3074 DECL_NAME (decl) = get_identifier (name);
3075 DECL_DEFER_OUTPUT (decl) = 1;
3076 DECL_COMDAT (decl) = 1;
3077 DECL_ARTIFICIAL (decl) = 1;
3079 rest_of_decl_compilation (decl, NULL, 1, 0);
3085 /* Make TYPE a complete type based on INITIAL_VALUE.
3086 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3087 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3090 complete_array_type (type, initial_value, do_default)
3095 tree maxindex = NULL_TREE;
3100 /* Note MAXINDEX is really the maximum index,
3101 one less than the size. */
3102 if (TREE_CODE (initial_value) == STRING_CST)
3105 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3106 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3109 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3111 tree elts = CONSTRUCTOR_ELTS (initial_value);
3112 maxindex = build_int_2 (-1, -1);
3113 for (; elts; elts = TREE_CHAIN (elts))
3115 if (TREE_PURPOSE (elts))
3116 maxindex = TREE_PURPOSE (elts);
3118 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3119 maxindex, integer_one_node));
3121 maxindex = copy_node (maxindex);
3125 /* Make an error message unless that happened already. */
3126 if (initial_value != error_mark_node)
3129 /* Prevent further error messages. */
3130 maxindex = build_int_2 (0, 0);
3137 maxindex = build_int_2 (0, 0);
3143 TYPE_DOMAIN (type) = build_index_type (maxindex);
3144 if (!TREE_TYPE (maxindex))
3145 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3148 /* Lay out the type now that we can get the real answer. */
3155 /* Determine whether TYPE is a structure with a flexible array member,
3156 or a union containing such a structure (possibly recursively). */
3159 flexible_array_type_p (type)
3163 switch (TREE_CODE (type))
3166 x = TYPE_FIELDS (type);
3169 while (TREE_CHAIN (x) != NULL_TREE)
3171 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3172 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3173 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3174 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3178 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3180 if (flexible_array_type_p (TREE_TYPE (x)))
3189 /* Given declspecs and a declarator,
3190 determine the name and type of the object declared
3191 and construct a ..._DECL node for it.
3192 (In one case we can return a ..._TYPE node instead.
3193 For invalid input we sometimes return 0.)
3195 DECLSPECS is a chain of tree_list nodes whose value fields
3196 are the storage classes and type specifiers.
3198 DECL_CONTEXT says which syntactic context this declaration is in:
3199 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3200 FUNCDEF for a function definition. Like NORMAL but a few different
3201 error messages in each case. Return value may be zero meaning
3202 this definition is too screwy to try to parse.
3203 PARM for a parameter declaration (either within a function prototype
3204 or before a function body). Make a PARM_DECL, or return void_type_node.
3205 TYPENAME if for a typename (in a cast or sizeof).
3206 Don't make a DECL node; just return the ..._TYPE node.
3207 FIELD for a struct or union field; make a FIELD_DECL.
3208 BITFIELD for a field with specified width.
3209 INITIALIZED is 1 if the decl has an initializer.
3211 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3212 It may also be so in the PARM case, for a prototype where the
3213 argument type is specified but not the name.
3215 This function is where the complicated C meanings of `static'
3216 and `extern' are interpreted. */
3219 grokdeclarator (declarator, declspecs, decl_context, initialized)
3222 enum decl_context decl_context;
3227 tree type = NULL_TREE;
3232 int type_quals = TYPE_UNQUALIFIED;
3234 int explicit_int = 0;
3235 int explicit_char = 0;
3236 int defaulted_int = 0;
3237 tree typedef_decl = 0;
3239 tree typedef_type = 0;
3240 int funcdef_flag = 0;
3241 enum tree_code innermost_code = ERROR_MARK;
3243 int size_varies = 0;
3244 tree decl_attr = NULL_TREE;
3245 tree array_ptr_quals = NULL_TREE;
3246 int array_parm_static = 0;
3247 tree returned_attrs = NULL_TREE;
3249 if (decl_context == BITFIELD)
3250 bitfield = 1, decl_context = FIELD;
3252 if (decl_context == FUNCDEF)
3253 funcdef_flag = 1, decl_context = NORMAL;
3255 /* Look inside a declarator for the name being declared
3256 and get it as a string, for an error message. */
3258 tree decl = declarator;
3262 switch (TREE_CODE (decl))
3267 innermost_code = TREE_CODE (decl);
3268 decl = TREE_OPERAND (decl, 0);
3272 decl = TREE_VALUE (decl);
3275 case IDENTIFIER_NODE:
3276 name = IDENTIFIER_POINTER (decl);
3287 /* A function definition's declarator must have the form of
3288 a function declarator. */
3290 if (funcdef_flag && innermost_code != CALL_EXPR)
3293 /* Anything declared one level down from the top level
3294 must be one of the parameters of a function
3295 (because the body is at least two levels down). */
3297 /* If this looks like a function definition, make it one,
3298 even if it occurs where parms are expected.
3299 Then store_parm_decls will reject it and not use it as a parm. */
3300 if (decl_context == NORMAL && !funcdef_flag
3301 && current_binding_level->parm_flag)
3302 decl_context = PARM;
3304 /* Look through the decl specs and record which ones appear.
3305 Some typespecs are defined as built-in typenames.
3306 Others, the ones that are modifiers of other types,
3307 are represented by bits in SPECBITS: set the bits for
3308 the modifiers that appear. Storage class keywords are also in SPECBITS.
3310 If there is a typedef name or a type, store the type in TYPE.
3311 This includes builtin typedefs such as `int'.
3313 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3314 and did not come from a user typedef.
3316 Set LONGLONG if `long' is mentioned twice. */
3318 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3320 tree id = TREE_VALUE (spec);
3322 /* If the entire declaration is itself tagged as deprecated then
3323 suppress reports of deprecated items. */
3324 if (id && TREE_DEPRECATED (id))
3326 if (deprecated_state != DEPRECATED_SUPPRESS)
3327 warn_deprecated_use (id);
3330 if (id == ridpointers[(int) RID_INT])
3332 if (id == ridpointers[(int) RID_CHAR])
3335 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3337 enum rid i = C_RID_CODE (id);
3338 if ((int) i <= (int) RID_LAST_MODIFIER)
3340 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3343 error ("`long long long' is too long for GCC");
3346 if (pedantic && !flag_isoc99 && ! in_system_header
3348 pedwarn ("ISO C90 does not support `long long'");
3352 else if (specbits & (1 << (int) i))
3354 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3357 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3360 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3363 /* Diagnose "__thread extern". Recall that this list
3364 is in the reverse order seen in the text. */
3366 && (specbits & (1 << (int) RID_EXTERN
3367 | 1 << (int) RID_STATIC)))
3369 if (specbits & 1 << (int) RID_EXTERN)
3370 error ("`__thread' before `extern'");
3372 error ("`__thread' before `static'");
3375 specbits |= 1 << (int) i;
3380 error ("two or more data types in declaration of `%s'", name);
3381 /* Actual typedefs come to us as TYPE_DECL nodes. */
3382 else if (TREE_CODE (id) == TYPE_DECL)
3384 if (TREE_TYPE (id) == error_mark_node)
3385 ; /* Allow the type to default to int to avoid cascading errors. */
3388 type = TREE_TYPE (id);
3389 decl_attr = DECL_ATTRIBUTES (id);
3393 /* Built-in types come as identifiers. */
3394 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3396 tree t = lookup_name (id);
3397 if (TREE_TYPE (t) == error_mark_node)
3399 else if (!t || TREE_CODE (t) != TYPE_DECL)
3400 error ("`%s' fails to be a typedef or built in type",
3401 IDENTIFIER_POINTER (id));
3404 type = TREE_TYPE (t);
3408 else if (TREE_CODE (id) != ERROR_MARK)
3415 typedef_type = type;
3417 size_varies = C_TYPE_VARIABLE_SIZE (type);
3419 /* No type at all: default to `int', and set DEFAULTED_INT
3420 because it was not a user-defined typedef. */
3424 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3425 | (1 << (int) RID_SIGNED)
3426 | (1 << (int) RID_UNSIGNED)
3427 | (1 << (int) RID_COMPLEX))))
3428 /* Don't warn about typedef foo = bar. */
3429 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3430 && ! in_system_header)
3432 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3433 and this is a function, or if -Wimplicit; prefer the former
3434 warning since it is more explicit. */
3435 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3437 warn_about_return_type = 1;
3438 else if (warn_implicit_int || flag_isoc99)
3439 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3444 type = integer_type_node;
3447 /* Now process the modifiers that were specified
3448 and check for invalid combinations. */
3450 /* Long double is a special combination. */
3452 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3453 && TYPE_MAIN_VARIANT (type) == double_type_node)
3455 specbits &= ~(1 << (int) RID_LONG);
3456 type = long_double_type_node;
3459 /* Check all other uses of type modifiers. */
3461 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3462 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3466 if ((specbits & 1 << (int) RID_LONG)
3467 && (specbits & 1 << (int) RID_SHORT))
3468 error ("both long and short specified for `%s'", name);
3469 else if (((specbits & 1 << (int) RID_LONG)
3470 || (specbits & 1 << (int) RID_SHORT))
3472 error ("long or short specified with char for `%s'", name);
3473 else if (((specbits & 1 << (int) RID_LONG)
3474 || (specbits & 1 << (int) RID_SHORT))
3475 && TREE_CODE (type) == REAL_TYPE)
3477 static int already = 0;
3479 error ("long or short specified with floating type for `%s'", name);
3480 if (! already && ! pedantic)
3482 error ("the only valid combination is `long double'");
3486 else if ((specbits & 1 << (int) RID_SIGNED)
3487 && (specbits & 1 << (int) RID_UNSIGNED))
3488 error ("both signed and unsigned specified for `%s'", name);
3489 else if (TREE_CODE (type) != INTEGER_TYPE)
3490 error ("long, short, signed or unsigned invalid for `%s'", name);
3494 if (!explicit_int && !defaulted_int && !explicit_char)
3496 error ("long, short, signed or unsigned used invalidly for `%s'",
3502 /* Discard the type modifiers if they are invalid. */
3505 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3506 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3511 if ((specbits & (1 << (int) RID_COMPLEX))
3512 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3514 error ("complex invalid for `%s'", name);
3515 specbits &= ~(1 << (int) RID_COMPLEX);
3518 /* Decide whether an integer type is signed or not.
3519 Optionally treat bitfields as signed by default. */
3520 if (specbits & 1 << (int) RID_UNSIGNED
3521 || (bitfield && ! flag_signed_bitfields
3522 && (explicit_int || defaulted_int || explicit_char
3523 /* A typedef for plain `int' without `signed'
3524 can be controlled just like plain `int'. */
3525 || ! (typedef_decl != 0
3526 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3527 && TREE_CODE (type) != ENUMERAL_TYPE
3528 && !(specbits & 1 << (int) RID_SIGNED)))
3531 type = long_long_unsigned_type_node;
3532 else if (specbits & 1 << (int) RID_LONG)
3533 type = long_unsigned_type_node;
3534 else if (specbits & 1 << (int) RID_SHORT)
3535 type = short_unsigned_type_node;
3536 else if (type == char_type_node)
3537 type = unsigned_char_type_node;
3538 else if (typedef_decl)
3539 type = c_common_unsigned_type (type);
3541 type = unsigned_type_node;
3543 else if ((specbits & 1 << (int) RID_SIGNED)
3544 && type == char_type_node)
3545 type = signed_char_type_node;
3547 type = long_long_integer_type_node;
3548 else if (specbits & 1 << (int) RID_LONG)
3549 type = long_integer_type_node;
3550 else if (specbits & 1 << (int) RID_SHORT)
3551 type = short_integer_type_node;
3553 if (specbits & 1 << (int) RID_COMPLEX)
3555 if (pedantic && !flag_isoc99)
3556 pedwarn ("ISO C90 does not support complex types");
3557 /* If we just have "complex", it is equivalent to
3558 "complex double", but if any modifiers at all are specified it is
3559 the complex form of TYPE. E.g, "complex short" is
3560 "complex short int". */
3562 if (defaulted_int && ! longlong
3563 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3564 | (1 << (int) RID_SIGNED)
3565 | (1 << (int) RID_UNSIGNED))))
3568 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3569 type = complex_double_type_node;
3571 else if (type == integer_type_node)
3574 pedwarn ("ISO C does not support complex integer types");
3575 type = complex_integer_type_node;
3577 else if (type == float_type_node)
3578 type = complex_float_type_node;
3579 else if (type == double_type_node)
3580 type = complex_double_type_node;
3581 else if (type == long_double_type_node)
3582 type = complex_long_double_type_node;
3586 pedwarn ("ISO C does not support complex integer types");
3587 type = build_complex_type (type);
3591 /* Figure out the type qualifiers for the declaration. There are
3592 two ways a declaration can become qualified. One is something
3593 like `const int i' where the `const' is explicit. Another is
3594 something like `typedef const int CI; CI i' where the type of the
3595 declaration contains the `const'. */
3596 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3597 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
3598 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3599 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3600 if (constp > 1 && ! flag_isoc99)
3601 pedwarn ("duplicate `const'");
3602 if (restrictp > 1 && ! flag_isoc99)
3603 pedwarn ("duplicate `restrict'");
3604 if (volatilep > 1 && ! flag_isoc99)
3605 pedwarn ("duplicate `volatile'");
3606 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3607 type = TYPE_MAIN_VARIANT (type);
3608 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3609 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3610 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3612 /* Warn if two storage classes are given. Default to `auto'. */
3617 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3618 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3619 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3620 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3621 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3623 /* "static __thread" and "extern __thread" are allowed. */
3624 if ((specbits & (1 << (int) RID_THREAD
3625 | 1 << (int) RID_STATIC
3626 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3629 /* Warn about storage classes that are invalid for certain
3630 kinds of declarations (parameters, typenames, etc.). */
3633 error ("multiple storage classes in declaration of `%s'", name);
3634 else if (funcdef_flag
3636 & ((1 << (int) RID_REGISTER)
3637 | (1 << (int) RID_AUTO)
3638 | (1 << (int) RID_TYPEDEF)
3639 | (1 << (int) RID_THREAD))))
3641 if (specbits & 1 << (int) RID_AUTO
3642 && (pedantic || current_binding_level == global_binding_level))
3643 pedwarn ("function definition declared `auto'");
3644 if (specbits & 1 << (int) RID_REGISTER)
3645 error ("function definition declared `register'");
3646 if (specbits & 1 << (int) RID_TYPEDEF)
3647 error ("function definition declared `typedef'");
3648 if (specbits & 1 << (int) RID_THREAD)
3649 error ("function definition declared `__thread'");
3650 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3651 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3653 else if (decl_context != NORMAL && nclasses > 0)
3655 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3659 switch (decl_context)
3662 error ("storage class specified for structure field `%s'",
3666 error ("storage class specified for parameter `%s'", name);
3669 error ("storage class specified for typename");
3672 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3673 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3674 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3677 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3679 /* `extern' with initialization is invalid if not at top level. */
3680 if (current_binding_level == global_binding_level)
3681 warning ("`%s' initialized and declared `extern'", name);
3683 error ("`%s' has both `extern' and initializer", name);
3685 else if (current_binding_level == global_binding_level)
3687 if (specbits & 1 << (int) RID_AUTO)
3688 error ("top-level declaration of `%s' specifies `auto'", name);
3692 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3693 error ("nested function `%s' declared `extern'", name);
3694 else if ((specbits & (1 << (int) RID_THREAD
3695 | 1 << (int) RID_EXTERN
3696 | 1 << (int) RID_STATIC))
3697 == (1 << (int) RID_THREAD))
3699 error ("function-scope `%s' implicitly auto and declared `__thread'",
3701 specbits &= ~(1 << (int) RID_THREAD);
3706 /* Now figure out the structure of the declarator proper.
3707 Descend through it, creating more complex types, until we reach
3708 the declared identifier (or NULL_TREE, in an absolute declarator). */
3710 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3712 if (type == error_mark_node)
3714 declarator = TREE_OPERAND (declarator, 0);
3718 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3719 an INDIRECT_REF (for *...),
3720 a CALL_EXPR (for ...(...)),
3721 a TREE_LIST (for nested attributes),
3722 an identifier (for the name being declared)
3723 or a null pointer (for the place in an absolute declarator
3724 where the name was omitted).
3725 For the last two cases, we have just exited the loop.
3727 At this point, TYPE is the type of elements of an array,
3728 or for a function to return, or for a pointer to point to.
3729 After this sequence of ifs, TYPE is the type of the
3730 array or function or pointer, and DECLARATOR has had its
3731 outermost layer removed. */
3733 if (array_ptr_quals != NULL_TREE || array_parm_static)
3735 /* Only the innermost declarator (making a parameter be of
3736 array type which is converted to pointer type)
3737 may have static or type qualifiers. */
3738 error ("static or type qualifiers in non-parameter array declarator");
3739 array_ptr_quals = NULL_TREE;
3740 array_parm_static = 0;
3743 if (TREE_CODE (declarator) == TREE_LIST)
3745 /* We encode a declarator with embedded attributes using
3747 tree attrs = TREE_PURPOSE (declarator);
3750 declarator = TREE_VALUE (declarator);
3751 inner_decl = declarator;
3752 while (inner_decl != NULL_TREE
3753 && TREE_CODE (inner_decl) == TREE_LIST)
3754 inner_decl = TREE_VALUE (inner_decl);
3755 if (inner_decl == NULL_TREE
3756 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3757 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3758 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3759 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3760 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3761 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3762 returned_attrs = decl_attributes (&type,
3763 chainon (returned_attrs, attrs),
3766 else if (TREE_CODE (declarator) == ARRAY_REF)
3768 tree itype = NULL_TREE;
3769 tree size = TREE_OPERAND (declarator, 1);
3770 /* The index is a signed object `sizetype' bits wide. */
3771 tree index_type = c_common_signed_type (sizetype);
3773 array_ptr_quals = TREE_TYPE (declarator);
3774 array_parm_static = TREE_STATIC (declarator);
3776 declarator = TREE_OPERAND (declarator, 0);
3778 /* Check for some types that there cannot be arrays of. */
3780 if (VOID_TYPE_P (type))
3782 error ("declaration of `%s' as array of voids", name);
3783 type = error_mark_node;
3786 if (TREE_CODE (type) == FUNCTION_TYPE)
3788 error ("declaration of `%s' as array of functions", name);
3789 type = error_mark_node;
3792 if (pedantic && flexible_array_type_p (type))
3793 pedwarn ("invalid use of structure with flexible array member");
3795 if (size == error_mark_node)
3796 type = error_mark_node;
3798 if (type == error_mark_node)
3801 /* If size was specified, set ITYPE to a range-type for that size.
3802 Otherwise, ITYPE remains null. finish_decl may figure it out
3803 from an initial value. */
3807 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3808 STRIP_TYPE_NOPS (size);
3810 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3812 error ("size of array `%s' has non-integer type", name);
3813 size = integer_one_node;
3816 if (pedantic && integer_zerop (size))
3817 pedwarn ("ISO C forbids zero-size array `%s'", name);
3819 if (TREE_CODE (size) == INTEGER_CST)
3821 constant_expression_warning (size);
3822 if (tree_int_cst_sgn (size) < 0)
3824 error ("size of array `%s' is negative", name);
3825 size = integer_one_node;
3830 /* Make sure the array size remains visibly nonconstant
3831 even if it is (eg) a const variable with known value. */
3834 if (!flag_isoc99 && pedantic)
3836 if (TREE_CONSTANT (size))
3837 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3840 pedwarn ("ISO C90 forbids variable-size array `%s'",
3845 if (integer_zerop (size))
3847 /* A zero-length array cannot be represented with an
3848 unsigned index type, which is what we'll get with
3849 build_index_type. Create an open-ended range instead. */
3850 itype = build_range_type (sizetype, size, NULL_TREE);
3854 /* Compute the maximum valid index, that is, size - 1.
3855 Do the calculation in index_type, so that if it is
3856 a variable the computations will be done in the
3858 itype = fold (build (MINUS_EXPR, index_type,
3859 convert (index_type, size),
3860 convert (index_type, size_one_node)));
3862 /* If that overflowed, the array is too big.
3863 ??? While a size of INT_MAX+1 technically shouldn't
3864 cause an overflow (because we subtract 1), the overflow
3865 is recorded during the conversion to index_type, before
3866 the subtraction. Handling this case seems like an
3867 unnecessary complication. */
3868 if (TREE_OVERFLOW (itype))
3870 error ("size of array `%s' is too large", name);
3871 type = error_mark_node;
3877 /* We must be able to distinguish the
3878 SAVE_EXPR_CONTEXT for the variably-sized type
3879 so that we can set it correctly in
3880 set_save_expr_context. The convention is
3881 that all SAVE_EXPRs that need to be reset
3882 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3883 tree cfd = current_function_decl;
3884 if (decl_context == PARM)
3885 current_function_decl = NULL_TREE;
3886 itype = variable_size (itype);
3887 if (decl_context == PARM)
3888 current_function_decl = cfd;
3890 itype = build_index_type (itype);
3893 else if (decl_context == FIELD)
3895 if (pedantic && !flag_isoc99 && !in_system_header)
3896 pedwarn ("ISO C90 does not support flexible array members");
3898 /* ISO C99 Flexible array members are effectively identical
3899 to GCC's zero-length array extension. */
3900 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3903 /* If pedantic, complain about arrays of incomplete types. */
3905 if (pedantic && !COMPLETE_TYPE_P (type))
3906 pedwarn ("array type has incomplete element type");
3909 /* We shouldn't have a function type here at all!
3910 Functions aren't allowed as array elements. */
3911 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
3912 && (constp || volatilep))
3913 pedwarn ("ISO C forbids const or volatile function types");
3916 /* Build the array type itself, then merge any constancy or
3917 volatility into the target type. We must do it in this order
3918 to ensure that the TYPE_MAIN_VARIANT field of the array type
3919 is set correctly. */
3921 type = build_array_type (type, itype);
3923 type = c_build_qualified_type (type, type_quals);
3926 C_TYPE_VARIABLE_SIZE (type) = 1;
3928 /* The GCC extension for zero-length arrays differs from
3929 ISO flexible array members in that sizeof yields zero. */
3930 if (size && integer_zerop (size))
3933 TYPE_SIZE (type) = bitsize_zero_node;
3934 TYPE_SIZE_UNIT (type) = size_zero_node;
3936 if (decl_context != PARM
3937 && (array_ptr_quals != NULL_TREE || array_parm_static))
3939 error ("static or type qualifiers in non-parameter array declarator");
3940 array_ptr_quals = NULL_TREE;
3941 array_parm_static = 0;
3944 else if (TREE_CODE (declarator) == CALL_EXPR)
3948 /* Declaring a function type.
3949 Make sure we have a valid type for the function to return. */
3950 if (type == error_mark_node)
3955 /* Warn about some types functions can't return. */
3957 if (TREE_CODE (type) == FUNCTION_TYPE)
3959 error ("`%s' declared as function returning a function", name);
3960 type = integer_type_node;
3962 if (TREE_CODE (type) == ARRAY_TYPE)
3964 error ("`%s' declared as function returning an array", name);
3965 type = integer_type_node;
3968 /* Construct the function type and go to the next
3969 inner layer of declarator. */
3971 arg_types = grokparms (TREE_OPERAND (declarator, 1),
3973 /* Say it's a definition
3974 only for the CALL_EXPR
3975 closest to the identifier. */
3976 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
3977 /* Type qualifiers before the return type of the function
3978 qualify the return type, not the function type. */
3981 /* Type qualifiers on a function return type are normally
3982 permitted by the standard but have no effect, so give a
3983 warning at -Wextra. Qualifiers on a void return type have
3984 meaning as a GNU extension, and are banned on function
3985 definitions in ISO C. FIXME: strictly we shouldn't
3986 pedwarn for qualified void return types except on function
3987 definitions, but not doing so could lead to the undesirable
3988 state of a "volatile void" function return type not being
3989 warned about, and a use of the function being compiled
3990 with GNU semantics, with no diagnostics under -pedantic. */
3991 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
3992 pedwarn ("ISO C forbids qualified void function return type");
3993 else if (extra_warnings
3994 && !(VOID_TYPE_P (type)
3995 && type_quals == TYPE_QUAL_VOLATILE))
3996 warning ("type qualifiers ignored on function return type");
3998 type = c_build_qualified_type (type, type_quals);
4000 type_quals = TYPE_UNQUALIFIED;
4002 type = build_function_type (type, arg_types);
4003 declarator = TREE_OPERAND (declarator, 0);
4005 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4006 the formal parameter list of this FUNCTION_TYPE to point to
4007 the FUNCTION_TYPE node itself. */
4012 for (link = last_function_parm_tags;
4014 link = TREE_CHAIN (link))
4015 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4018 else if (TREE_CODE (declarator) == INDIRECT_REF)
4020 /* Merge any constancy or volatility into the target type
4023 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4025 pedwarn ("ISO C forbids qualified function types");
4027 type = c_build_qualified_type (type, type_quals);
4028 type_quals = TYPE_UNQUALIFIED;
4031 type = build_pointer_type (type);
4033 /* Process a list of type modifier keywords
4034 (such as const or volatile) that were given inside the `*'. */
4036 if (TREE_TYPE (declarator))
4044 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4045 typemodlist = TREE_CHAIN (typemodlist))
4047 tree qualifier = TREE_VALUE (typemodlist);
4049 if (C_IS_RESERVED_WORD (qualifier))
4051 if (C_RID_CODE (qualifier) == RID_CONST)
4053 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4055 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4065 error ("invalid type modifier within pointer declarator");
4066 if (constp > 1 && ! flag_isoc99)
4067 pedwarn ("duplicate `const'");
4068 if (volatilep > 1 && ! flag_isoc99)
4069 pedwarn ("duplicate `volatile'");
4070 if (restrictp > 1 && ! flag_isoc99)
4071 pedwarn ("duplicate `restrict'");
4073 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4074 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4075 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4078 declarator = TREE_OPERAND (declarator, 0);
4085 /* Now TYPE has the actual type. */
4087 /* Did array size calculations overflow? */
4089 if (TREE_CODE (type) == ARRAY_TYPE
4090 && COMPLETE_TYPE_P (type)
4091 && TREE_OVERFLOW (TYPE_SIZE (type)))
4093 error ("size of array `%s' is too large", name);
4094 /* If we proceed with the array type as it is, we'll eventually
4095 crash in tree_low_cst(). */
4096 type = error_mark_node;
4099 /* If this is declaring a typedef name, return a TYPE_DECL. */
4101 if (specbits & (1 << (int) RID_TYPEDEF))
4104 /* Note that the grammar rejects storage classes
4105 in typenames, fields or parameters */
4106 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4108 pedwarn ("ISO C forbids qualified function types");
4110 type = c_build_qualified_type (type, type_quals);
4111 decl = build_decl (TYPE_DECL, declarator, type);
4112 if ((specbits & (1 << (int) RID_SIGNED))
4113 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4114 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4115 decl_attributes (&decl, returned_attrs, 0);
4119 /* Detect the case of an array type of unspecified size
4120 which came, as such, direct from a typedef name.
4121 We must copy the type, so that each identifier gets
4122 a distinct type, so that each identifier's size can be
4123 controlled separately by its own initializer. */
4125 if (type != 0 && typedef_type != 0
4126 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4127 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4129 type = build_array_type (TREE_TYPE (type), 0);
4131 C_TYPE_VARIABLE_SIZE (type) = 1;
4134 /* If this is a type name (such as, in a cast or sizeof),
4135 compute the type and return it now. */
4137 if (decl_context == TYPENAME)
4139 /* Note that the grammar rejects storage classes
4140 in typenames, fields or parameters */
4141 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4143 pedwarn ("ISO C forbids const or volatile function types");
4145 type = c_build_qualified_type (type, type_quals);
4146 decl_attributes (&type, returned_attrs, 0);
4150 /* Aside from typedefs and type names (handle above),
4151 `void' at top level (not within pointer)
4152 is allowed only in public variables.
4153 We don't complain about parms either, but that is because
4154 a better error message can be made later. */
4156 if (VOID_TYPE_P (type) && decl_context != PARM
4157 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4158 && ((specbits & (1 << (int) RID_EXTERN))
4159 || (current_binding_level == global_binding_level
4161 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4163 error ("variable or field `%s' declared void", name);
4164 type = integer_type_node;
4167 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4168 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4173 if (decl_context == PARM)
4175 tree type_as_written;
4178 /* A parameter declared as an array of T is really a pointer to T.
4179 One declared as a function is really a pointer to a function. */
4181 if (TREE_CODE (type) == ARRAY_TYPE)
4183 /* Transfer const-ness of array into that of type pointed to. */
4184 type = TREE_TYPE (type);
4186 type = c_build_qualified_type (type, type_quals);
4187 type = build_pointer_type (type);
4188 type_quals = TYPE_UNQUALIFIED;
4189 if (array_ptr_quals)
4191 tree new_ptr_quals, new_ptr_attrs;
4193 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4194 /* We don't yet implement attributes in this context. */
4195 if (new_ptr_attrs != NULL_TREE)
4196 warning ("attributes in parameter array declarator ignored");
4201 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4203 tree qualifier = TREE_VALUE (new_ptr_quals);
4205 if (C_IS_RESERVED_WORD (qualifier))
4207 if (C_RID_CODE (qualifier) == RID_CONST)
4209 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4211 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4221 error ("invalid type modifier within array declarator");
4223 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4224 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4225 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4229 else if (TREE_CODE (type) == FUNCTION_TYPE)
4231 if (pedantic && type_quals)
4232 pedwarn ("ISO C forbids qualified function types");
4234 type = c_build_qualified_type (type, type_quals);
4235 type = build_pointer_type (type);
4236 type_quals = TYPE_UNQUALIFIED;
4238 else if (type_quals)
4239 type = c_build_qualified_type (type, type_quals);
4241 type_as_written = type;
4243 decl = build_decl (PARM_DECL, declarator, type);
4245 C_DECL_VARIABLE_SIZE (decl) = 1;
4247 /* Compute the type actually passed in the parmlist,
4248 for the case where there is no prototype.
4249 (For example, shorts and chars are passed as ints.)
4250 When there is a prototype, this is overridden later. */
4252 if (type == error_mark_node)
4253 promoted_type = type;
4255 promoted_type = c_type_promotes_to (type);
4257 DECL_ARG_TYPE (decl) = promoted_type;
4258 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4260 else if (decl_context == FIELD)
4262 /* Structure field. It may not be a function. */
4264 if (TREE_CODE (type) == FUNCTION_TYPE)
4266 error ("field `%s' declared as a function", name);
4267 type = build_pointer_type (type);
4269 else if (TREE_CODE (type) != ERROR_MARK
4270 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4272 error ("field `%s' has incomplete type", name);
4273 type = error_mark_node;
4275 /* Move type qualifiers down to element of an array. */
4276 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4278 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4280 TYPE_DOMAIN (type));
4282 /* Leave the field const or volatile as well. */
4283 type_quals = TYPE_UNQUALIFIED;
4286 decl = build_decl (FIELD_DECL, declarator, type);
4287 DECL_NONADDRESSABLE_P (decl) = bitfield;
4290 C_DECL_VARIABLE_SIZE (decl) = 1;
4292 else if (TREE_CODE (type) == FUNCTION_TYPE)
4294 /* Every function declaration is "external"
4295 except for those which are inside a function body
4296 in which `auto' is used.
4297 That is a case not specified by ANSI C,
4298 and we use it for forward declarations for nested functions. */
4299 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4300 || current_binding_level == global_binding_level);
4302 if (specbits & (1 << (int) RID_AUTO)
4303 && (pedantic || current_binding_level == global_binding_level))
4304 pedwarn ("invalid storage class for function `%s'", name);
4305 if (specbits & (1 << (int) RID_REGISTER))
4306 error ("invalid storage class for function `%s'", name);
4307 if (specbits & (1 << (int) RID_THREAD))
4308 error ("invalid storage class for function `%s'", name);
4309 /* Function declaration not at top level.
4310 Storage classes other than `extern' are not allowed
4311 and `extern' makes no difference. */
4312 if (current_binding_level != global_binding_level
4313 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4315 pedwarn ("invalid storage class for function `%s'", name);
4317 decl = build_decl (FUNCTION_DECL, declarator, type);
4318 decl = build_decl_attribute_variant (decl, decl_attr);
4320 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4321 ggc_alloc_cleared (sizeof (struct lang_decl));
4323 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4324 pedwarn ("ISO C forbids qualified function types");
4326 /* GNU C interprets a `volatile void' return type to indicate
4327 that the function does not return. */
4328 if ((type_quals & TYPE_QUAL_VOLATILE)
4329 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4330 warning ("`noreturn' function returns non-void value");
4333 DECL_EXTERNAL (decl) = 1;
4334 /* Record absence of global scope for `static' or `auto'. */
4336 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4339 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4341 /* Record presence of `inline', if it is reasonable. */
4342 if (MAIN_NAME_P (declarator))
4345 warning ("cannot inline function `main'");
4349 /* Assume that otherwise the function can be inlined. */
4350 DECL_DECLARED_INLINE_P (decl) = 1;
4352 /* Do not mark bare declarations as DECL_INLINE. Doing so
4353 in the presence of multiple declarations can result in
4354 the abstract origin pointing between the declarations,
4355 which will confuse dwarf2out. */
4358 DECL_INLINE (decl) = 1;
4359 if (specbits & (1 << (int) RID_EXTERN))
4360 current_extern_inline = 1;
4363 /* If -finline-functions, assume it can be inlined. This does
4364 two things: let the function be deferred until it is actually
4365 needed, and let dwarf2 know that the function is inlinable. */
4366 else if (flag_inline_trees == 2 && initialized)
4368 if (!DECL_INLINE (decl))
4369 DID_INLINE_FUNC (decl) = 1;
4370 DECL_INLINE (decl) = 1;
4371 DECL_DECLARED_INLINE_P (decl) = 0;
4376 /* It's a variable. */
4377 /* An uninitialized decl with `extern' is a reference. */
4378 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4380 /* Move type qualifiers down to element of an array. */
4381 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4383 int saved_align = TYPE_ALIGN(type);
4384 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4386 TYPE_DOMAIN (type));
4387 TYPE_ALIGN (type) = saved_align;
4388 #if 0 /* Leave the variable const or volatile as well. */
4389 type_quals = TYPE_UNQUALIFIED;
4392 else if (type_quals)
4393 type = c_build_qualified_type (type, type_quals);
4395 /* It is invalid to create an `extern' declaration for a
4396 variable if there is a global declaration that is
4398 if (extern_ref && current_binding_level != global_binding_level)
4402 global_decl = identifier_global_value (declarator);
4404 && TREE_CODE (global_decl) == VAR_DECL
4405 && !TREE_PUBLIC (global_decl))
4406 error ("variable previously declared `static' redeclared "
4410 decl = build_decl (VAR_DECL, declarator, type);
4412 C_DECL_VARIABLE_SIZE (decl) = 1;
4415 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4417 DECL_EXTERNAL (decl) = extern_ref;
4419 /* At top level, the presence of a `static' or `register' storage
4420 class specifier, or the absence of all storage class specifiers
4421 makes this declaration a definition (perhaps tentative). Also,
4422 the absence of both `static' and `register' makes it public. */
4423 if (current_binding_level == global_binding_level)
4425 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4426 | (1 << (int) RID_REGISTER)));
4427 TREE_STATIC (decl) = !extern_ref;
4429 /* Not at top level, only `static' makes a static definition. */
4432 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4433 TREE_PUBLIC (decl) = extern_ref;
4436 if (specbits & 1 << (int) RID_THREAD)
4438 if (targetm.have_tls)
4439 DECL_THREAD_LOCAL (decl) = 1;
4441 /* A mere warning is sure to result in improper semantics
4442 at runtime. Don't bother to allow this to compile. */
4443 error ("thread-local storage not supported for this target");
4447 /* Record `register' declaration for warnings on &
4448 and in case doing stupid register allocation. */
4450 if (specbits & (1 << (int) RID_REGISTER))
4451 DECL_REGISTER (decl) = 1;
4453 /* Record constancy and volatility. */
4454 c_apply_type_quals_to_decl (type_quals, decl);
4456 /* If a type has volatile components, it should be stored in memory.
4457 Otherwise, the fact that those components are volatile
4458 will be ignored, and would even crash the compiler. */
4459 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4460 c_mark_addressable (decl);
4462 decl_attributes (&decl, returned_attrs, 0);
4468 /* Decode the parameter-list info for a function type or function definition.
4469 The argument is the value returned by `get_parm_info' (or made in parse.y
4470 if there is an identifier list instead of a parameter decl list).
4471 These two functions are separate because when a function returns
4472 or receives functions then each is called multiple times but the order
4473 of calls is different. The last call to `grokparms' is always the one
4474 that contains the formal parameter names of a function definition.
4476 Store in `last_function_parms' a chain of the decls of parms.
4477 Also store in `last_function_parm_tags' a chain of the struct, union,
4478 and enum tags declared among the parms.
4480 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4482 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4483 a mere declaration. A nonempty identifier-list gets an error message
4484 when FUNCDEF_FLAG is zero. */
4487 grokparms (parms_info, funcdef_flag)
4491 tree first_parm = TREE_CHAIN (parms_info);
4493 last_function_parms = TREE_PURPOSE (parms_info);
4494 last_function_parm_tags = TREE_VALUE (parms_info);
4496 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4497 && !in_system_header)
4498 warning ("function declaration isn't a prototype");
4501 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4504 pedwarn ("parameter names (without types) in function declaration");
4506 last_function_parms = first_parm;
4513 /* We no longer test FUNCDEF_FLAG.
4514 If the arg types are incomplete in a declaration,
4515 they must include undefined tags.
4516 These tags can never be defined in the scope of the declaration,
4517 so the types can never be completed,
4518 and no call can be compiled successfully. */
4520 /* In a fcn definition, arg types must be complete. */
4523 for (parm = last_function_parms, typelt = first_parm;
4525 parm = TREE_CHAIN (parm))
4526 /* Skip over any enumeration constants declared here. */
4527 if (TREE_CODE (parm) == PARM_DECL)
4529 /* Barf if the parameter itself has an incomplete type. */
4530 tree type = TREE_VALUE (typelt);
4531 if (type == error_mark_node)
4533 if (!COMPLETE_TYPE_P (type))
4535 if (funcdef_flag && DECL_NAME (parm) != 0)
4536 error ("parameter `%s' has incomplete type",
4537 IDENTIFIER_POINTER (DECL_NAME (parm)));
4539 warning ("parameter has incomplete type");
4542 TREE_VALUE (typelt) = error_mark_node;
4543 TREE_TYPE (parm) = error_mark_node;
4547 /* This has been replaced by parm_tags_warning, which
4548 uses a more accurate criterion for what to warn
4552 /* Now warn if is a pointer to an incomplete type. */
4553 while (TREE_CODE (type) == POINTER_TYPE
4554 || TREE_CODE (type) == REFERENCE_TYPE)
4555 type = TREE_TYPE (type);
4556 type = TYPE_MAIN_VARIANT (type);
4557 if (!COMPLETE_TYPE_P (type))
4559 if (DECL_NAME (parm) != 0)
4560 warning ("parameter `%s' points to incomplete type",
4561 IDENTIFIER_POINTER (DECL_NAME (parm)));
4563 warning ("parameter points to incomplete type");
4567 typelt = TREE_CHAIN (typelt);
4574 /* Return a tree_list node with info on a parameter list just parsed.
4575 The TREE_PURPOSE is a chain of decls of those parms.
4576 The TREE_VALUE is a list of structure, union and enum tags defined.
4577 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4578 This tree_list node is later fed to `grokparms'.
4580 VOID_AT_END nonzero means append `void' to the end of the type-list.
4581 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4584 get_parm_info (void_at_end)
4590 tree tags = gettags ();
4591 tree parms = getdecls ();
4593 tree order = current_binding_level->parm_order;
4595 /* Just `void' (and no ellipsis) is special. There are really no parms.
4596 But if the `void' is qualified (by `const' or `volatile') or has a
4597 storage class specifier (`register'), then the behavior is undefined;
4598 by not counting it as the special case of `void' we will cause an
4599 error later. Typedefs for `void' are OK (see DR#157). */
4600 if (void_at_end && parms != 0
4601 && TREE_CHAIN (parms) == 0
4602 && VOID_TYPE_P (TREE_TYPE (parms))
4603 && ! TREE_THIS_VOLATILE (parms)
4604 && ! TREE_READONLY (parms)
4605 && ! DECL_REGISTER (parms)
4606 && DECL_NAME (parms) == 0)
4609 storedecls (NULL_TREE);
4610 return tree_cons (NULL_TREE, NULL_TREE,
4611 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4614 /* Extract enumerator values and other non-parms declared with the parms.
4615 Likewise any forward parm decls that didn't have real parm decls. */
4616 for (decl = parms; decl;)
4618 tree next = TREE_CHAIN (decl);
4620 if (TREE_CODE (decl) != PARM_DECL)
4622 TREE_CHAIN (decl) = new_parms;
4625 else if (TREE_ASM_WRITTEN (decl))
4627 error_with_decl (decl,
4628 "parameter `%s' has just a forward declaration");
4629 TREE_CHAIN (decl) = new_parms;
4635 /* Put the parm decls back in the order they were in in the parm list. */
4636 for (t = order; t; t = TREE_CHAIN (t))
4639 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4641 TREE_CHAIN (TREE_VALUE (t)) = 0;
4644 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4647 /* Store the parmlist in the binding level since the old one
4648 is no longer a valid list. (We have changed the chain pointers.) */
4649 storedecls (new_parms);
4651 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4652 /* There may also be declarations for enumerators if an enumeration
4653 type is declared among the parms. Ignore them here. */
4654 if (TREE_CODE (decl) == PARM_DECL)
4656 /* Since there is a prototype,
4657 args are passed in their declared types. */
4658 tree type = TREE_TYPE (decl);
4659 DECL_ARG_TYPE (decl) = type;
4660 if (PROMOTE_PROTOTYPES
4661 && INTEGRAL_TYPE_P (type)
4662 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4663 DECL_ARG_TYPE (decl) = integer_type_node;
4665 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4666 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
4667 && DECL_NAME (decl) == 0)
4669 error ("`void' in parameter list must be the entire list");
4675 return tree_cons (new_parms, tags,
4676 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
4678 return tree_cons (new_parms, tags, nreverse (types));
4681 /* At end of parameter list, warn about any struct, union or enum tags
4682 defined within. Do so because these types cannot ever become complete. */
4685 parmlist_tags_warning ()
4690 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4692 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4693 /* An anonymous union parm type is meaningful as a GNU extension.
4694 So don't warn for that. */
4695 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
4697 if (TREE_PURPOSE (elt) != 0)
4699 if (code == RECORD_TYPE)
4700 warning ("`struct %s' declared inside parameter list",
4701 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4702 else if (code == UNION_TYPE)
4703 warning ("`union %s' declared inside parameter list",
4704 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4706 warning ("`enum %s' declared inside parameter list",
4707 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4711 /* For translation these need to be separate warnings */
4712 if (code == RECORD_TYPE)
4713 warning ("anonymous struct declared inside parameter list");
4714 else if (code == UNION_TYPE)
4715 warning ("anonymous union declared inside parameter list");
4717 warning ("anonymous enum declared inside parameter list");
4721 warning ("its scope is only this definition or declaration, which is probably not what you want");
4727 /* Get the struct, enum or union (CODE says which) with tag NAME.
4728 Define the tag as a forward-reference if it is not defined. */
4731 xref_tag (code, name)
4732 enum tree_code code;
4735 /* If a cross reference is requested, look up the type
4736 already defined for this tag and return it. */
4738 tree ref = lookup_tag (code, name, 0);
4739 /* If this is the right type of tag, return what we found.
4740 (This reference will be shadowed by shadow_tag later if appropriate.)
4741 If this is the wrong type of tag, do not return it. If it was the
4742 wrong type in the same binding level, we will have had an error
4743 message already; if in a different binding level and declaring
4744 a name, pending_xref_error will give an error message; but if in a
4745 different binding level and not declaring a name, this tag should
4746 shadow the previous declaration of a different type of tag, and
4747 this would not work properly if we return the reference found.
4748 (For example, with "struct foo" in an outer scope, "union foo;"
4749 must shadow that tag with a new one of union type.) */
4750 if (ref && TREE_CODE (ref) == code)
4753 /* If no such tag is yet defined, create a forward-reference node
4754 and record it as the "definition".
4755 When a real declaration of this type is found,
4756 the forward-reference will be altered into a real type. */
4758 ref = make_node (code);
4759 if (code == ENUMERAL_TYPE)
4761 /* Give the type a default layout like unsigned int
4762 to avoid crashing if it does not get defined. */
4763 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4764 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4765 TYPE_USER_ALIGN (ref) = 0;
4766 TREE_UNSIGNED (ref) = 1;
4767 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4768 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4769 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4772 pushtag (name, ref);
4777 /* Make sure that the tag NAME is defined *in the current binding level*
4778 at least as a forward reference.
4779 CODE says which kind of tag NAME ought to be. */
4782 start_struct (code, name)
4783 enum tree_code code;
4786 /* If there is already a tag defined at this binding level
4787 (as a forward reference), just return it. */
4792 ref = lookup_tag (code, name, 1);
4793 if (ref && TREE_CODE (ref) == code)
4795 if (TYPE_FIELDS (ref))
4797 if (code == UNION_TYPE)
4798 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4800 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4805 /* Otherwise create a forward-reference just so the tag is in scope. */
4807 ref = make_node (code);
4808 pushtag (name, ref);
4811 C_TYPE_BEING_DEFINED (ref) = 1;
4812 TYPE_PACKED (ref) = flag_pack_struct;
4816 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4817 of a structure component, returning a FIELD_DECL node.
4818 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4820 This is done during the parsing of the struct declaration.
4821 The FIELD_DECL nodes are chained together and the lot of them
4822 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4825 grokfield (filename, line, declarator, declspecs, width)
4826 const char *filename ATTRIBUTE_UNUSED;
4827 int line ATTRIBUTE_UNUSED;
4828 tree declarator, declspecs, width;
4832 if (declarator == NULL_TREE && width == NULL_TREE)
4834 /* This is an unnamed decl.
4836 If we have something of the form "union { list } ;" then this
4837 is the anonymous union extension. Similarly for struct.
4839 If this is something of the form "struct foo;", then
4840 If MS extensions are enabled, this is handled as an
4842 Otherwise this is a forward declaration of a structure tag.
4844 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4845 If MS extensions are enabled and foo names a structure, then
4846 again this is an anonymous struct.
4847 Otherwise this is an error.
4849 Oh what a horrid tangled web we weave. I wonder if MS consciously
4850 took this from Plan 9 or if it was an accident of implementation
4851 that took root before someone noticed the bug... */
4853 tree type = TREE_VALUE (declspecs);
4855 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4856 type = TREE_TYPE (type);
4857 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4859 if (flag_ms_extensions)
4862 goto warn_unnamed_field;
4863 else if (TYPE_NAME (type) == NULL)
4866 goto warn_unnamed_field;
4871 warning ("declaration does not declare anything");
4876 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4878 finish_decl (value, NULL_TREE, NULL_TREE);
4879 DECL_INITIAL (value) = width;
4882 objc_check_decl (value);
4886 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4887 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4888 ATTRIBUTES are attributes to be applied to the structure. */
4891 finish_struct (t, fieldlist, attributes)
4897 int toplevel = global_binding_level == current_binding_level;
4898 int saw_named_field;
4900 /* If this type was previously laid out as a forward reference,
4901 make sure we lay it out again. */
4905 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4907 /* Nameless union parm types are useful as GCC extension. */
4908 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4909 /* Otherwise, warn about any struct or union def. in parmlist. */
4910 if (in_parm_level_p ())
4913 pedwarn ("%s defined inside parms",
4914 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4916 warning ("%s defined inside parms",
4917 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4922 for (x = fieldlist; x; x = TREE_CHAIN (x))
4923 if (DECL_NAME (x) != 0)
4927 pedwarn ("%s has no %s",
4928 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4929 fieldlist ? _("named members") : _("members"));
4932 /* Install struct as DECL_CONTEXT of each field decl.
4933 Also process specified field sizes,m which is found in the DECL_INITIAL.
4934 Store 0 there, except for ": 0" fields (so we can find them
4935 and delete them, below). */
4937 saw_named_field = 0;
4938 for (x = fieldlist; x; x = TREE_CHAIN (x))
4940 DECL_CONTEXT (x) = t;
4941 DECL_PACKED (x) |= TYPE_PACKED (t);
4943 /* If any field is const, the structure type is pseudo-const. */
4944 if (TREE_READONLY (x))
4945 C_TYPE_FIELDS_READONLY (t) = 1;
4948 /* A field that is pseudo-const makes the structure likewise. */
4949 tree t1 = TREE_TYPE (x);
4950 while (TREE_CODE (t1) == ARRAY_TYPE)
4951 t1 = TREE_TYPE (t1);
4952 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4953 && C_TYPE_FIELDS_READONLY (t1))
4954 C_TYPE_FIELDS_READONLY (t) = 1;
4957 /* Any field that is volatile means variables of this type must be
4958 treated in some ways as volatile. */
4959 if (TREE_THIS_VOLATILE (x))
4960 C_TYPE_FIELDS_VOLATILE (t) = 1;
4962 /* Any field of nominal variable size implies structure is too. */
4963 if (C_DECL_VARIABLE_SIZE (x))
4964 C_TYPE_VARIABLE_SIZE (t) = 1;
4966 /* Detect invalid nested redefinition. */
4967 if (TREE_TYPE (x) == t)
4968 error ("nested redefinition of `%s'",
4969 IDENTIFIER_POINTER (TYPE_NAME (t)));
4971 /* Detect invalid bit-field size. */
4972 if (DECL_INITIAL (x))
4973 STRIP_NOPS (DECL_INITIAL (x));
4974 if (DECL_INITIAL (x))
4976 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
4977 constant_expression_warning (DECL_INITIAL (x));
4981 "bit-field `%s' width not an integer constant");
4982 DECL_INITIAL (x) = NULL;
4986 /* Detect invalid bit-field type. */
4987 if (DECL_INITIAL (x)
4988 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
4989 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
4990 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
4992 error_with_decl (x, "bit-field `%s' has invalid type");
4993 DECL_INITIAL (x) = NULL;
4996 if (DECL_INITIAL (x) && pedantic
4997 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
4998 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
4999 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5000 /* Accept an enum that's equivalent to int or unsigned int. */
5001 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5002 && (TYPE_PRECISION (TREE_TYPE (x))
5003 == TYPE_PRECISION (integer_type_node))))
5004 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5006 /* Detect and ignore out of range field width and process valid
5008 if (DECL_INITIAL (x))
5011 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
5012 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5014 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5015 error_with_decl (x, "negative width in bit-field `%s'");
5016 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5017 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5018 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5019 error_with_decl (x, "zero width for bit-field `%s'");
5022 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5023 unsigned HOST_WIDE_INT width
5024 = tree_low_cst (DECL_INITIAL (x), 1);
5026 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5027 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5028 TREE_UNSIGNED (TREE_TYPE (x)))
5030 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5031 TREE_UNSIGNED (TREE_TYPE (x))))))
5032 warning_with_decl (x,
5033 "`%s' is narrower than values of its type");
5035 DECL_SIZE (x) = bitsize_int (width);
5036 DECL_BIT_FIELD (x) = 1;
5037 SET_DECL_C_BIT_FIELD (x);
5041 DECL_INITIAL (x) = 0;
5043 /* Detect flexible array member in an invalid context. */
5044 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5045 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5046 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5047 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5049 if (TREE_CODE (t) == UNION_TYPE)
5050 error_with_decl (x, "flexible array member in union");
5051 else if (TREE_CHAIN (x) != NULL_TREE)
5052 error_with_decl (x, "flexible array member not at end of struct");
5053 else if (! saw_named_field)
5054 error_with_decl (x, "flexible array member in otherwise empty struct");
5057 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5058 && flexible_array_type_p (TREE_TYPE (x)))
5059 pedwarn_with_decl (x, "invalid use of structure with flexible array member");
5062 saw_named_field = 1;
5065 /* Delete all duplicate fields from the fieldlist */
5066 for (x = fieldlist; x && TREE_CHAIN (x);)
5067 /* Anonymous fields aren't duplicates. */
5068 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5076 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5082 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5084 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5085 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5091 /* Now we have the nearly final fieldlist. Record it,
5092 then lay out the structure or union (including the fields). */
5094 TYPE_FIELDS (t) = fieldlist;
5098 /* Delete all zero-width bit-fields from the fieldlist */
5100 tree *fieldlistp = &fieldlist;
5102 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5103 *fieldlistp = TREE_CHAIN (*fieldlistp);
5105 fieldlistp = &TREE_CHAIN (*fieldlistp);
5108 /* Now we have the truly final field list.
5109 Store it in this type and in the variants. */
5111 TYPE_FIELDS (t) = fieldlist;
5113 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5115 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5116 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5117 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5118 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5121 /* If this was supposed to be a transparent union, but we can't
5122 make it one, warn and turn off the flag. */
5123 if (TREE_CODE (t) == UNION_TYPE
5124 && TYPE_TRANSPARENT_UNION (t)
5125 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5127 TYPE_TRANSPARENT_UNION (t) = 0;
5128 warning ("union cannot be made transparent");
5131 /* If this structure or union completes the type of any previous
5132 variable declaration, lay it out and output its rtl. */
5134 if (current_binding_level->incomplete_list != NULL_TREE)
5136 tree prev = NULL_TREE;
5138 for (x = current_binding_level->incomplete_list; x; x = TREE_CHAIN (x))
5140 tree decl = TREE_VALUE (x);
5142 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5143 && TREE_CODE (decl) != TYPE_DECL)
5145 layout_decl (decl, 0);
5146 /* This is a no-op in c-lang.c or something real in objc-act.c. */
5148 objc_check_decl (decl);
5149 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5152 /* Unlink X from the incomplete list. */
5154 TREE_CHAIN (prev) = TREE_CHAIN (x);
5156 current_binding_level->incomplete_list = TREE_CHAIN (x);
5158 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5159 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5161 tree element = TREE_TYPE (decl);
5162 while (TREE_CODE (element) == ARRAY_TYPE)
5163 element = TREE_TYPE (element);
5166 layout_array_type (TREE_TYPE (decl));
5167 if (TREE_CODE (decl) != TYPE_DECL)
5169 layout_decl (decl, 0);
5171 objc_check_decl (decl);
5172 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5176 /* Unlink X from the incomplete list. */
5178 TREE_CHAIN (prev) = TREE_CHAIN (x);
5180 current_binding_level->incomplete_list = TREE_CHAIN (x);
5186 /* Finish debugging output for this type. */
5187 rest_of_type_compilation (t, toplevel);
5192 /* Lay out the type T, and its element type, and so on. */
5195 layout_array_type (t)
5198 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5199 layout_array_type (TREE_TYPE (t));
5203 /* Begin compiling the definition of an enumeration type.
5204 NAME is its name (or null if anonymous).
5205 Returns the type object, as yet incomplete.
5206 Also records info about it so that build_enumerator
5207 may be used to declare the individual values as they are read. */
5215 /* If this is the real definition for a previous forward reference,
5216 fill in the contents in the same object that used to be the
5217 forward reference. */
5220 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5222 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5224 enumtype = make_node (ENUMERAL_TYPE);
5225 pushtag (name, enumtype);
5228 C_TYPE_BEING_DEFINED (enumtype) = 1;
5230 if (TYPE_VALUES (enumtype) != 0)
5232 /* This enum is a named one that has been declared already. */
5233 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5235 /* Completely replace its old definition.
5236 The old enumerators remain defined, however. */
5237 TYPE_VALUES (enumtype) = 0;
5240 enum_next_value = integer_zero_node;
5243 if (flag_short_enums)
5244 TYPE_PACKED (enumtype) = 1;
5249 /* After processing and defining all the values of an enumeration type,
5250 install their decls in the enumeration type and finish it off.
5251 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5252 and ATTRIBUTES are the specified attributes.
5253 Returns ENUMTYPE. */
5256 finish_enum (enumtype, values, attributes)
5262 tree minnode = 0, maxnode = 0, enum_value_type;
5263 int precision, unsign;
5264 int toplevel = (global_binding_level == current_binding_level);
5266 if (in_parm_level_p ())
5267 warning ("enum defined inside parms");
5269 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5271 /* Calculate the maximum value of any enumerator in this type. */
5273 if (values == error_mark_node)
5274 minnode = maxnode = integer_zero_node;
5277 minnode = maxnode = TREE_VALUE (values);
5278 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5280 tree value = TREE_VALUE (pair);
5281 if (tree_int_cst_lt (maxnode, value))
5283 if (tree_int_cst_lt (value, minnode))
5288 /* Construct the final type of this enumeration. It is the same
5289 as one of the integral types - the narrowest one that fits, except
5290 that normally we only go as narrow as int - and signed iff any of
5291 the values are negative. */
5292 unsign = (tree_int_cst_sgn (minnode) >= 0);
5293 precision = MAX (min_precision (minnode, unsign),
5294 min_precision (maxnode, unsign));
5295 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5297 tree narrowest = c_common_type_for_size (precision, unsign);
5300 warning ("enumeration values exceed range of largest integer");
5301 narrowest = long_long_integer_type_node;
5304 precision = TYPE_PRECISION (narrowest);
5307 precision = TYPE_PRECISION (integer_type_node);
5309 if (precision == TYPE_PRECISION (integer_type_node))
5310 enum_value_type = c_common_type_for_size (precision, 0);
5312 enum_value_type = enumtype;
5314 TYPE_MIN_VALUE (enumtype) = minnode;
5315 TYPE_MAX_VALUE (enumtype) = maxnode;
5316 TYPE_PRECISION (enumtype) = precision;
5317 TREE_UNSIGNED (enumtype) = unsign;
5318 TYPE_SIZE (enumtype) = 0;
5319 layout_type (enumtype);
5321 if (values != error_mark_node)
5323 /* Change the type of the enumerators to be the enum type. We
5324 need to do this irrespective of the size of the enum, for
5325 proper type checking. Replace the DECL_INITIALs of the
5326 enumerators, and the value slots of the list, with copies
5327 that have the enum type; they cannot be modified in place
5328 because they may be shared (e.g. integer_zero_node) Finally,
5329 change the purpose slots to point to the names of the decls. */
5330 for (pair = values; pair; pair = TREE_CHAIN (pair))
5332 tree enu = TREE_PURPOSE (pair);
5334 TREE_TYPE (enu) = enumtype;
5336 /* The ISO C Standard mandates enumerators to have type int,
5337 even though the underlying type of an enum type is
5338 unspecified. Here we convert any enumerators that fit in
5339 an int to type int, to avoid promotions to unsigned types
5340 when comparing integers with enumerators that fit in the
5341 int range. When -pedantic is given, build_enumerator()
5342 would have already taken care of those that don't fit. */
5343 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5344 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5346 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5348 TREE_PURPOSE (pair) = DECL_NAME (enu);
5349 TREE_VALUE (pair) = DECL_INITIAL (enu);
5352 TYPE_VALUES (enumtype) = values;
5355 /* Fix up all variant types of this enum type. */
5356 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5358 if (tem == enumtype)
5360 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5361 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5362 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5363 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5364 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5365 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5366 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5367 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5368 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5369 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5372 /* Finish debugging output for this type. */
5373 rest_of_type_compilation (enumtype, toplevel);
5378 /* Build and install a CONST_DECL for one value of the
5379 current enumeration type (one that was begun with start_enum).
5380 Return a tree-list containing the CONST_DECL and its value.
5381 Assignment of sequential values by default is handled here. */
5384 build_enumerator (name, value)
5389 /* Validate and default VALUE. */
5391 /* Remove no-op casts from the value. */
5393 STRIP_TYPE_NOPS (value);
5397 if (TREE_CODE (value) == INTEGER_CST)
5399 value = default_conversion (value);
5400 constant_expression_warning (value);
5404 error ("enumerator value for `%s' not integer constant",
5405 IDENTIFIER_POINTER (name));
5410 /* Default based on previous value. */
5411 /* It should no longer be possible to have NON_LVALUE_EXPR
5415 value = enum_next_value;
5417 error ("overflow in enumeration values");
5420 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5422 pedwarn ("ISO C restricts enumerator values to range of `int'");
5423 value = convert (integer_type_node, value);
5426 /* Set basis for default for next value. */
5427 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5428 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5430 /* Now create a declaration for the enum value name. */
5432 type = TREE_TYPE (value);
5433 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5434 TYPE_PRECISION (integer_type_node)),
5435 (TYPE_PRECISION (type)
5436 >= TYPE_PRECISION (integer_type_node)
5437 && TREE_UNSIGNED (type)));
5439 decl = build_decl (CONST_DECL, name, type);
5440 DECL_INITIAL (decl) = convert (type, value);
5443 return tree_cons (decl, value, NULL_TREE);
5447 /* Create the FUNCTION_DECL for a function definition.
5448 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5449 the declaration; they describe the function's name and the type it returns,
5450 but twisted together in a fashion that parallels the syntax of C.
5452 This function creates a binding context for the function body
5453 as well as setting up the FUNCTION_DECL in current_function_decl.
5455 Returns 1 on success. If the DECLARATOR is not suitable for a function
5456 (it defines a datum instead), we return 0, which tells
5457 yyparse to report a parse error. */
5460 start_function (declspecs, declarator, attributes)
5461 tree declarator, declspecs, attributes;
5463 tree decl1, old_decl;
5465 int old_immediate_size_expand = immediate_size_expand;
5467 current_function_returns_value = 0; /* Assume, until we see it does. */
5468 current_function_returns_null = 0;
5469 current_function_returns_abnormally = 0;
5470 warn_about_return_type = 0;
5471 current_extern_inline = 0;
5473 shadowed_labels = 0;
5475 /* Don't expand any sizes in the return type of the function. */
5476 immediate_size_expand = 0;
5478 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5480 /* If the declarator is not suitable for a function definition,
5481 cause a syntax error. */
5484 immediate_size_expand = old_immediate_size_expand;
5488 decl_attributes (&decl1, attributes, 0);
5490 /* If #pragma weak was used, mark the decl weak now. */
5491 if (current_binding_level == global_binding_level)
5492 maybe_apply_pragma_weak (decl1);
5494 if (DECL_DECLARED_INLINE_P (decl1)
5495 && DECL_UNINLINABLE (decl1)
5496 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5497 warning_with_decl (decl1,
5498 "inline function `%s' given attribute noinline");
5500 announce_function (decl1);
5502 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5504 error ("return type is an incomplete type");
5505 /* Make it return void instead. */
5507 = build_function_type (void_type_node,
5508 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5511 if (warn_about_return_type)
5512 pedwarn_c99 ("return type defaults to `int'");
5514 /* Save the parm names or decls from this function's declarator
5515 where store_parm_decls will find them. */
5516 current_function_parms = last_function_parms;
5517 current_function_parm_tags = last_function_parm_tags;
5519 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5520 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5521 DECL_INITIAL (decl1) = error_mark_node;
5523 /* If this definition isn't a prototype and we had a prototype declaration
5524 before, copy the arg type info from that prototype.
5525 But not if what we had before was a builtin function. */
5526 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5527 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5528 && !DECL_BUILT_IN (old_decl)
5529 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5530 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5531 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5533 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5534 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5537 /* Optionally warn of old-fashioned def with no previous prototype. */
5538 if (warn_strict_prototypes
5539 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5540 && C_DECL_ISNT_PROTOTYPE (old_decl))
5541 warning ("function declaration isn't a prototype");
5542 /* Optionally warn of any global def with no previous prototype. */
5543 else if (warn_missing_prototypes
5544 && TREE_PUBLIC (decl1)
5545 && ! MAIN_NAME_P (DECL_NAME (decl1))
5546 && C_DECL_ISNT_PROTOTYPE (old_decl))
5547 warning_with_decl (decl1, "no previous prototype for `%s'");
5548 /* Optionally warn of any def with no previous prototype
5549 if the function has already been used. */
5550 else if (warn_missing_prototypes
5551 && old_decl != 0 && TREE_USED (old_decl)
5552 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5553 warning_with_decl (decl1,
5554 "`%s' was used with no prototype before its definition");
5555 /* Optionally warn of any global def with no previous declaration. */
5556 else if (warn_missing_declarations
5557 && TREE_PUBLIC (decl1)
5559 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5560 warning_with_decl (decl1, "no previous declaration for `%s'");
5561 /* Optionally warn of any def with no previous declaration
5562 if the function has already been used. */
5563 else if (warn_missing_declarations
5564 && old_decl != 0 && TREE_USED (old_decl)
5565 && C_DECL_IMPLICIT (old_decl))
5566 warning_with_decl (decl1,
5567 "`%s' was used with no declaration before its definition");
5569 /* This is a definition, not a reference.
5570 So normally clear DECL_EXTERNAL.
5571 However, `extern inline' acts like a declaration
5572 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5573 DECL_EXTERNAL (decl1) = current_extern_inline;
5575 /* This function exists in static storage.
5576 (This does not mean `static' in the C sense!) */
5577 TREE_STATIC (decl1) = 1;
5579 /* A nested function is not global. */
5580 if (current_function_decl != 0)
5581 TREE_PUBLIC (decl1) = 0;
5583 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5584 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5589 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5590 != integer_type_node)
5591 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5593 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5594 args = TREE_CHAIN (args))
5596 tree type = args ? TREE_VALUE (args) : 0;
5598 if (type == void_type_node)
5605 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5606 pedwarn_with_decl (decl1,
5607 "first argument of `%s' should be `int'");
5611 if (TREE_CODE (type) != POINTER_TYPE
5612 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5613 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5615 pedwarn_with_decl (decl1,
5616 "second argument of `%s' should be `char **'");
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 "third argument of `%s' should probably be `char **'");
5630 /* It is intentional that this message does not mention the third
5631 argument because it's only mentioned in an appendix of the
5633 if (argct > 0 && (argct < 2 || argct > 3))
5634 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5636 if (! TREE_PUBLIC (decl1))
5637 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5640 /* Record the decl so that the function name is defined.
5641 If we already have a decl for this name, and it is a FUNCTION_DECL,
5642 use the old decl. */
5644 current_function_decl = pushdecl (decl1);
5647 declare_parm_level (1);
5649 make_decl_rtl (current_function_decl, NULL);
5651 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5652 /* Promote the value to int before returning it. */
5653 if (c_promoting_integer_type_p (restype))
5655 /* It retains unsignedness if not really getting wider. */
5656 if (TREE_UNSIGNED (restype)
5657 && (TYPE_PRECISION (restype)
5658 == TYPE_PRECISION (integer_type_node)))
5659 restype = unsigned_type_node;
5661 restype = integer_type_node;
5663 DECL_RESULT (current_function_decl)
5664 = build_decl (RESULT_DECL, NULL_TREE, restype);
5666 /* If this fcn was already referenced via a block-scope `extern' decl
5667 (or an implicit decl), propagate certain information about the usage. */
5668 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5669 TREE_ADDRESSABLE (current_function_decl) = 1;
5671 immediate_size_expand = old_immediate_size_expand;
5673 start_fname_decls ();
5678 /* Store the parameter declarations into the current function declaration.
5679 This is called after parsing the parameter declarations, before
5680 digesting the body of the function.
5682 For an old-style definition, modify the function's type
5683 to specify at least the number of arguments. */
5688 tree fndecl = current_function_decl;
5691 /* This is either a chain of PARM_DECLs (if a prototype was used)
5692 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5693 tree specparms = current_function_parms;
5695 /* This is a list of types declared among parms in a prototype. */
5696 tree parmtags = current_function_parm_tags;
5698 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5699 tree parmdecls = getdecls ();
5701 /* This is a chain of any other decls that came in among the parm
5702 declarations. If a parm is declared with enum {foo, bar} x;
5703 then CONST_DECLs for foo and bar are put here. */
5706 /* The function containing FNDECL, if any. */
5707 tree context = decl_function_context (fndecl);
5709 /* Nonzero if this definition is written with a prototype. */
5712 int saved_warn_shadow = warn_shadow;
5714 /* Don't re-emit shadow warnings. */
5717 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5719 /* This case is when the function was defined with an ANSI prototype.
5720 The parms already have decls, so we need not do anything here
5721 except record them as in effect
5722 and complain if any redundant old-style parm decls were written. */
5733 error_with_decl (fndecl,
5734 "parm types given both in parmlist and separately");
5735 /* Get rid of the erroneous decls; don't keep them on
5736 the list of parms, since they might not be PARM_DECLs. */
5737 for (decl = current_binding_level->names;
5738 decl; decl = TREE_CHAIN (decl))
5739 if (DECL_NAME (decl))
5740 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = 0;
5741 for (link = current_binding_level->shadowed;
5742 link; link = TREE_CHAIN (link))
5743 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5744 current_binding_level->names = 0;
5745 current_binding_level->shadowed = 0;
5748 specparms = nreverse (specparms);
5749 for (parm = specparms; parm; parm = next)
5751 next = TREE_CHAIN (parm);
5752 if (TREE_CODE (parm) == PARM_DECL)
5754 if (DECL_NAME (parm) == 0)
5755 error_with_decl (parm, "parameter name omitted");
5756 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
5757 && VOID_TYPE_P (TREE_TYPE (parm)))
5759 error_with_decl (parm, "parameter `%s' declared void");
5760 /* Change the type to error_mark_node so this parameter
5761 will be ignored by assign_parms. */
5762 TREE_TYPE (parm) = error_mark_node;
5768 /* If we find an enum constant or a type tag,
5769 put it aside for the moment. */
5770 TREE_CHAIN (parm) = 0;
5771 others = chainon (others, parm);
5775 /* Get the decls in their original chain order
5776 and record in the function. */
5777 DECL_ARGUMENTS (fndecl) = getdecls ();
5780 /* If this function takes a variable number of arguments,
5781 add a phony parameter to the end of the parm list,
5782 to represent the position of the first unnamed argument. */
5783 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5786 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5787 /* Let's hope the address of the unnamed parm
5788 won't depend on its type. */
5789 TREE_TYPE (dummy) = integer_type_node;
5790 DECL_ARG_TYPE (dummy) = integer_type_node;
5791 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
5795 /* Now pushdecl the enum constants. */
5796 for (parm = others; parm; parm = next)
5798 next = TREE_CHAIN (parm);
5799 if (DECL_NAME (parm) == 0)
5801 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5803 else if (TREE_CODE (parm) != PARM_DECL)
5807 storetags (chainon (parmtags, gettags ()));
5811 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5812 each with a parm name as the TREE_VALUE.
5814 PARMDECLS is a chain of declarations for parameters.
5815 Warning! It can also contain CONST_DECLs which are not parameters
5816 but are names of enumerators of any enum types
5817 declared among the parameters.
5819 First match each formal parameter name with its declaration.
5820 Associate decls with the names and store the decls
5821 into the TREE_PURPOSE slots. */
5823 /* We use DECL_WEAK as a flag to show which parameters have been
5824 seen already since it is not used on PARM_DECL or CONST_DECL. */
5825 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5826 DECL_WEAK (parm) = 0;
5828 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5830 tree tail, found = NULL;
5832 if (TREE_VALUE (parm) == 0)
5834 error_with_decl (fndecl,
5835 "parameter name missing from parameter list");
5836 TREE_PURPOSE (parm) = 0;
5840 /* See if any of the parmdecls specifies this parm by name.
5841 Ignore any enumerator decls. */
5842 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5843 if (DECL_NAME (tail) == TREE_VALUE (parm)
5844 && TREE_CODE (tail) == PARM_DECL)
5850 /* If declaration already marked, we have a duplicate name.
5851 Complain, and don't use this decl twice. */
5852 if (found && DECL_WEAK (found))
5854 error_with_decl (found, "multiple parameters named `%s'");
5858 /* If the declaration says "void", complain and ignore it. */
5859 if (found && VOID_TYPE_P (TREE_TYPE (found)))
5861 error_with_decl (found, "parameter `%s' declared void");
5862 TREE_TYPE (found) = integer_type_node;
5863 DECL_ARG_TYPE (found) = integer_type_node;
5864 layout_decl (found, 0);
5867 /* If no declaration found, default to int. */
5870 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5872 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5873 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5874 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5876 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
5877 else if (extra_warnings)
5878 warning_with_decl (found, "type of `%s' defaults to `int'");
5882 TREE_PURPOSE (parm) = found;
5884 /* Mark this decl as "already found". */
5885 DECL_WEAK (found) = 1;
5888 /* Put anything which is on the parmdecls chain and which is
5889 not a PARM_DECL onto the list NONPARMS. (The types of
5890 non-parm things which might appear on the list include
5891 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5892 any actual PARM_DECLs not matched with any names. */
5895 for (parm = parmdecls; parm;)
5897 tree next = TREE_CHAIN (parm);
5898 TREE_CHAIN (parm) = 0;
5900 if (TREE_CODE (parm) != PARM_DECL)
5901 nonparms = chainon (nonparms, parm);
5904 /* Complain about args with incomplete types. */
5905 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5907 error_with_decl (parm, "parameter `%s' has incomplete type");
5908 TREE_TYPE (parm) = error_mark_node;
5911 if (! DECL_WEAK (parm))
5913 error_with_decl (parm,
5914 "declaration for parameter `%s' but no such parameter");
5915 /* Pretend the parameter was not missing.
5916 This gets us to a standard state and minimizes
5917 further error messages. */
5919 = chainon (specparms,
5920 tree_cons (parm, NULL_TREE, NULL_TREE));
5927 /* Chain the declarations together in the order of the list of
5928 names. Store that chain in the function decl, replacing the
5931 DECL_ARGUMENTS (fndecl) = 0;
5934 for (last = 0; parm; parm = TREE_CHAIN (parm))
5935 if (TREE_PURPOSE (parm))
5938 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
5940 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5941 last = TREE_PURPOSE (parm);
5942 TREE_CHAIN (last) = 0;
5946 /* If there was a previous prototype,
5947 set the DECL_ARG_TYPE of each argument according to
5948 the type previously specified, and report any mismatches. */
5950 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5953 for (parm = DECL_ARGUMENTS (fndecl),
5954 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5955 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5956 != void_type_node));
5957 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5959 if (parm == 0 || type == 0
5960 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5962 error ("number of arguments doesn't match prototype");
5963 error ("%Hprototype declaration",
5964 ¤t_function_prototype_locus);
5967 /* Type for passing arg must be consistent with that
5968 declared for the arg. ISO C says we take the unqualified
5969 type for parameters declared with qualified type. */
5970 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5971 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
5973 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5974 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5976 /* Adjust argument to match prototype. E.g. a previous
5977 `int foo(float);' prototype causes
5978 `int foo(x) float x; {...}' to be treated like
5979 `int foo(float x) {...}'. This is particularly
5980 useful for argument types like uid_t. */
5981 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5983 if (PROMOTE_PROTOTYPES
5984 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5985 && TYPE_PRECISION (TREE_TYPE (parm))
5986 < TYPE_PRECISION (integer_type_node))
5987 DECL_ARG_TYPE (parm) = integer_type_node;
5991 pedwarn ("promoted argument `%s' doesn't match prototype",
5992 IDENTIFIER_POINTER (DECL_NAME (parm)));
5993 warning ("%Hprototype declaration",
5994 ¤t_function_prototype_locus);
5999 error ("argument `%s' doesn't match prototype",
6000 IDENTIFIER_POINTER (DECL_NAME (parm)));
6001 error ("%Hprototype declaration",
6002 ¤t_function_prototype_locus);
6006 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6009 /* Otherwise, create a prototype that would match. */
6013 tree actual = 0, last = 0, type;
6015 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6017 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6019 TREE_CHAIN (last) = type;
6024 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6026 TREE_CHAIN (last) = type;
6030 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6031 of the type of this function, but we need to avoid having this
6032 affect the types of other similarly-typed functions, so we must
6033 first force the generation of an identical (but separate) type
6034 node for the relevant function type. The new node we create
6035 will be a variant of the main variant of the original function
6038 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6040 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6043 /* Now store the final chain of decls for the arguments
6044 as the decl-chain of the current lexical scope.
6045 Put the enumerators in as well, at the front so that
6046 DECL_ARGUMENTS is not modified. */
6048 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6051 /* Make sure the binding level for the top of the function body
6052 gets a BLOCK if there are any in the function.
6053 Otherwise, the dbx output is wrong. */
6055 keep_next_if_subblocks = 1;
6057 /* ??? This might be an improvement,
6058 but needs to be thought about some more. */
6060 keep_next_level_flag = 1;
6063 /* Write a record describing this function definition to the prototypes
6064 file (if requested). */
6066 gen_aux_info_record (fndecl, 1, 0, prototype);
6068 /* Initialize the RTL code for the function. */
6069 init_function_start (fndecl, input_filename, input_line);
6071 /* Begin the statement tree for this function. */
6072 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6074 /* If this is a nested function, save away the sizes of any
6075 variable-size types so that we can expand them when generating
6081 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6082 = nreverse (get_pending_sizes ());
6083 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6086 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6089 /* This function is being processed in whole-function mode. */
6090 cfun->x_whole_function_mode_p = 1;
6092 /* Even though we're inside a function body, we still don't want to
6093 call expand_expr to calculate the size of a variable-sized array.
6094 We haven't necessarily assigned RTL to all variables yet, so it's
6095 not safe to try to expand expressions involving them. */
6096 immediate_size_expand = 0;
6097 cfun->x_dont_save_pending_sizes_p = 1;
6099 warn_shadow = saved_warn_shadow;
6102 /* Finish up a function declaration and compile that function
6103 all the way to assembler language output. The free the storage
6104 for the function definition.
6106 This is called after parsing the body of the function definition.
6108 NESTED is nonzero if the function being finished is nested in another.
6109 CAN_DEFER_P is nonzero if the function may be deferred. */
6112 finish_function (nested, can_defer_p)
6116 tree fndecl = current_function_decl;
6118 /* When a function declaration is totally empty, e.g.
6120 (the argument list is irrelevant) the compstmt rule will not
6121 bother calling pushlevel/poplevel, which means we get here with
6122 the binding_level stack out of sync. Detect this situation by
6123 noticing that the current_binding_level is still as
6124 store_parm_decls left it, and do a dummy push/pop to get back to
6125 consistency. Note that the call to pushlevel does not actually
6126 push another binding level - see there for details. */
6127 if (current_binding_level->parm_flag && keep_next_if_subblocks)
6134 /* This caused &foo to be of type ptr-to-const-function which then
6135 got a warning when stored in a ptr-to-function variable. */
6136 TREE_READONLY (fndecl) = 1;
6139 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6141 /* Must mark the RESULT_DECL as being in this function. */
6143 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6145 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6147 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6148 != integer_type_node)
6150 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6151 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6153 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6157 #ifdef DEFAULT_MAIN_RETURN
6158 /* Make it so that `main' always returns success by default. */
6159 DEFAULT_MAIN_RETURN;
6162 c_expand_return (integer_zero_node);
6167 finish_fname_decls ();
6169 /* Tie off the statement tree for this function. */
6170 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6172 /* Complain if there's just no return statement. */
6173 if (warn_return_type
6174 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6175 && !current_function_returns_value && !current_function_returns_null
6176 /* Don't complain if we abort. */
6177 && !current_function_returns_abnormally
6178 /* Don't warn for main(). */
6179 && !MAIN_NAME_P (DECL_NAME (fndecl))
6180 /* Or if they didn't actually specify a return type. */
6181 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6182 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6183 inline function, as we might never be compiled separately. */
6184 && DECL_INLINE (fndecl))
6185 warning ("no return statement in function returning non-void");
6187 /* Clear out memory we no longer need. */
6188 free_after_parsing (cfun);
6189 /* Since we never call rest_of_compilation, we never clear
6190 CFUN. Do so explicitly. */
6191 free_after_compilation (cfun);
6194 if (flag_unit_at_a_time && can_defer_p)
6196 cgraph_finalize_function (fndecl, DECL_SAVED_TREE (fndecl));
6197 current_function_decl = NULL;
6203 /* Function is parsed.
6204 Generate RTL for the body of this function or defer
6205 it for later expansion. */
6206 int uninlinable = 1;
6208 /* There's no reason to do any of the work here if we're only doing
6209 semantic analysis; this code just generates RTL. */
6210 if (flag_syntax_only)
6212 current_function_decl = NULL;
6213 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6217 if (flag_inline_trees)
6219 /* First, cache whether the current function is inlinable. Some
6220 predicates depend on cfun and current_function_decl to
6221 function completely. */
6222 timevar_push (TV_INTEGRATION);
6223 uninlinable = ! tree_inlinable_function_p (fndecl, 0);
6226 /* We defer functions marked inline *even if* the function
6227 itself is not inlinable. This is because we don't yet
6228 know if the function will actually be used; we may be
6229 able to avoid emitting it entirely. */
6230 && (! uninlinable || DECL_DECLARED_INLINE_P (fndecl))
6231 /* Save function tree for inlining. Should return 0 if the
6232 language does not support function deferring or the
6233 function could not be deferred. */
6234 && defer_fn (fndecl))
6236 /* Let the back-end know that this function exists. */
6237 (*debug_hooks->deferred_inline_function) (fndecl);
6238 timevar_pop (TV_INTEGRATION);
6239 current_function_decl = NULL;
6243 /* Then, inline any functions called in it. */
6244 optimize_inline_calls (fndecl);
6245 timevar_pop (TV_INTEGRATION);
6248 c_expand_body (fndecl);
6250 /* Keep the function body if it's needed for inlining or dumping. */
6251 if (uninlinable && !dump_enabled_p (TDI_all))
6253 /* Allow the body of the function to be garbage collected. */
6254 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6257 /* Let the error reporting routines know that we're outside a
6258 function. For a nested function, this value is used in
6259 c_pop_function_context and then reset via pop_function_context. */
6260 current_function_decl = NULL;
6264 /* Generate the RTL for a deferred function FNDECL. */
6267 c_expand_deferred_function (fndecl)
6270 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6271 function was deferred, e.g. in duplicate_decls. */
6272 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6274 if (flag_inline_trees)
6276 timevar_push (TV_INTEGRATION);
6277 optimize_inline_calls (fndecl);
6278 timevar_pop (TV_INTEGRATION);
6280 c_expand_body (fndecl);
6281 current_function_decl = NULL;
6285 /* Called to move the SAVE_EXPRs for parameter declarations in a
6286 nested function into the nested function. DATA is really the
6287 nested FUNCTION_DECL. */
6290 set_save_expr_context (tree *tp,
6294 if (TREE_CODE (*tp) == SAVE_EXPR && !SAVE_EXPR_CONTEXT (*tp))
6295 SAVE_EXPR_CONTEXT (*tp) = (tree) data;
6296 /* Do not walk back into the SAVE_EXPR_CONTEXT; that will cause
6298 else if (DECL_P (*tp))
6304 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6305 then we are already in the process of generating RTL for another
6306 function. If can_defer_p is zero, we won't attempt to defer the
6307 generation of RTL. */
6310 c_expand_body_1 (fndecl, nested_p)
6314 timevar_push (TV_EXPAND);
6318 /* Make sure that we will evaluate variable-sized types involved
6319 in our function's type. */
6320 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6321 /* Squirrel away our current state. */
6322 push_function_context ();
6325 /* Initialize the RTL code for the function. */
6326 current_function_decl = fndecl;
6327 input_location = DECL_SOURCE_LOCATION (fndecl);
6328 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6330 /* This function is being processed in whole-function mode. */
6331 cfun->x_whole_function_mode_p = 1;
6333 /* Even though we're inside a function body, we still don't want to
6334 call expand_expr to calculate the size of a variable-sized array.
6335 We haven't necessarily assigned RTL to all variables yet, so it's
6336 not safe to try to expand expressions involving them. */
6337 immediate_size_expand = 0;
6338 cfun->x_dont_save_pending_sizes_p = 1;
6340 /* Set up parameters and prepare for return, for the function. */
6341 expand_function_start (fndecl, 0);
6343 /* If the function has a variably modified type, there may be
6344 SAVE_EXPRs in the parameter types. Their context must be set to
6345 refer to this function; they cannot be expanded in the containing
6347 if (decl_function_context (fndecl)
6348 && variably_modified_type_p (TREE_TYPE (fndecl)))
6349 walk_tree (&TREE_TYPE (fndecl), set_save_expr_context, fndecl,
6352 /* If this function is `main', emit a call to `__main'
6353 to run global initializers, etc. */
6354 if (DECL_NAME (fndecl)
6355 && MAIN_NAME_P (DECL_NAME (fndecl))
6356 && DECL_CONTEXT (fndecl) == NULL_TREE)
6357 expand_main_function ();
6359 /* Generate the RTL for this function. */
6360 expand_stmt (DECL_SAVED_TREE (fndecl));
6362 /* We hard-wired immediate_size_expand to zero above.
6363 expand_function_end will decrement this variable. So, we set the
6364 variable to one here, so that after the decrement it will remain
6366 immediate_size_expand = 1;
6368 /* Allow language dialects to perform special processing. */
6369 if (lang_expand_function_end)
6370 (*lang_expand_function_end) ();
6372 /* Generate rtl for function exit. */
6373 expand_function_end (input_filename, input_line, 0);
6375 /* If this is a nested function, protect the local variables in the stack
6376 above us from being collected while we're compiling this function. */
6378 ggc_push_context ();
6380 /* Run the optimizers and output the assembler code for this function. */
6381 rest_of_compilation (fndecl);
6383 /* Undo the GC context switch. */
6387 /* With just -Wextra, complain only if function returns both with
6388 and without a value. */
6390 && current_function_returns_value
6391 && current_function_returns_null)
6392 warning ("this function may return with or without a value");
6394 /* If requested, warn about function definitions where the function will
6395 return a value (usually of some struct or union type) which itself will
6396 take up a lot of stack space. */
6398 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6400 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6402 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6403 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6404 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6407 unsigned int size_as_int
6408 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6410 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6411 warning_with_decl (fndecl,
6412 "size of return value of `%s' is %u bytes",
6415 warning_with_decl (fndecl,
6416 "size of return value of `%s' is larger than %d bytes",
6421 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6422 && ! flag_inline_trees)
6424 /* Stop pointing to the local nodes about to be freed.
6425 But DECL_INITIAL must remain nonzero so we know this
6426 was an actual function definition.
6427 For a nested function, this is done in c_pop_function_context.
6428 If rest_of_compilation set this to 0, leave it 0. */
6429 if (DECL_INITIAL (fndecl) != 0)
6430 DECL_INITIAL (fndecl) = error_mark_node;
6432 DECL_ARGUMENTS (fndecl) = 0;
6435 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6437 if (targetm.have_ctors_dtors)
6438 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6439 DEFAULT_INIT_PRIORITY);
6441 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6444 if (DECL_STATIC_DESTRUCTOR (fndecl))
6446 if (targetm.have_ctors_dtors)
6447 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6448 DEFAULT_INIT_PRIORITY);
6450 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6454 /* Return to the enclosing function. */
6455 pop_function_context ();
6456 timevar_pop (TV_EXPAND);
6459 /* Like c_expand_body_1 but only for unnested functions. */
6462 c_expand_body (fndecl)
6465 c_expand_body_1 (fndecl, 0);
6468 /* Check the declarations given in a for-loop for satisfying the C99
6471 check_for_loop_decls ()
6477 /* If we get here, declarations have been used in a for loop without
6478 the C99 for loop scope. This doesn't make much sense, so don't
6480 error ("`for' loop initial declaration used outside C99 mode");
6483 /* C99 subclause 6.8.5 paragraph 3:
6485 [#3] The declaration part of a for statement shall only
6486 declare identifiers for objects having storage class auto or
6489 It isn't clear whether, in this sentence, "identifiers" binds to
6490 "shall only declare" or to "objects" - that is, whether all identifiers
6491 declared must be identifiers for objects, or whether the restriction
6492 only applies to those that are. (A question on this in comp.std.c
6493 in November 2000 received no answer.) We implement the strictest
6494 interpretation, to avoid creating an extension which later causes
6497 for (t = gettags (); t; t = TREE_CHAIN (t))
6499 if (TREE_PURPOSE (t) != 0)
6501 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6503 if (code == RECORD_TYPE)
6504 error ("`struct %s' declared in `for' loop initial declaration",
6505 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6506 else if (code == UNION_TYPE)
6507 error ("`union %s' declared in `for' loop initial declaration",
6508 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6510 error ("`enum %s' declared in `for' loop initial declaration",
6511 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6515 for (t = getdecls (); t; t = TREE_CHAIN (t))
6517 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6518 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6519 else if (TREE_STATIC (t))
6520 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6521 else if (DECL_EXTERNAL (t))
6522 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6526 /* Save and restore the variables in this file and elsewhere
6527 that keep track of the progress of compilation of the current function.
6528 Used for nested functions. */
6530 struct language_function GTY(())
6532 struct c_language_function base;
6534 tree shadowed_labels;
6537 int returns_abnormally;
6538 int warn_about_return_type;
6540 struct binding_level *binding_level;
6543 /* Save and reinitialize the variables
6544 used during compilation of a C function. */
6547 c_push_function_context (f)
6550 struct language_function *p;
6551 p = ((struct language_function *)
6552 ggc_alloc (sizeof (struct language_function)));
6555 p->base.x_stmt_tree = c_stmt_tree;
6556 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6557 p->named_labels = named_labels;
6558 p->shadowed_labels = shadowed_labels;
6559 p->returns_value = current_function_returns_value;
6560 p->returns_null = current_function_returns_null;
6561 p->returns_abnormally = current_function_returns_abnormally;
6562 p->warn_about_return_type = warn_about_return_type;
6563 p->extern_inline = current_extern_inline;
6564 p->binding_level = current_binding_level;
6567 /* Restore the variables used during compilation of a C function. */
6570 c_pop_function_context (f)
6573 struct language_function *p = f->language;
6576 /* Bring back all the labels that were shadowed. */
6577 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6578 if (DECL_NAME (TREE_VALUE (link)) != 0)
6579 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6580 = TREE_VALUE (link);
6582 if (DECL_SAVED_INSNS (current_function_decl) == 0
6583 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6585 /* Stop pointing to the local nodes about to be freed. */
6586 /* But DECL_INITIAL must remain nonzero so we know this
6587 was an actual function definition. */
6588 DECL_INITIAL (current_function_decl) = error_mark_node;
6589 DECL_ARGUMENTS (current_function_decl) = 0;
6592 c_stmt_tree = p->base.x_stmt_tree;
6593 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6594 named_labels = p->named_labels;
6595 shadowed_labels = p->shadowed_labels;
6596 current_function_returns_value = p->returns_value;
6597 current_function_returns_null = p->returns_null;
6598 current_function_returns_abnormally = p->returns_abnormally;
6599 warn_about_return_type = p->warn_about_return_type;
6600 current_extern_inline = p->extern_inline;
6601 current_binding_level = p->binding_level;
6606 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6609 c_dup_lang_specific_decl (decl)
6612 struct lang_decl *ld;
6614 if (!DECL_LANG_SPECIFIC (decl))
6617 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
6618 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
6619 sizeof (struct lang_decl));
6620 DECL_LANG_SPECIFIC (decl) = ld;
6623 /* The functions below are required for functionality of doing
6624 function at once processing in the C front end. Currently these
6625 functions are not called from anywhere in the C front end, but as
6626 these changes continue, that will change. */
6628 /* Returns nonzero if the current statement is a full expression,
6629 i.e. temporaries created during that statement should be destroyed
6630 at the end of the statement. */
6633 stmts_are_full_exprs_p ()
6638 /* Returns the stmt_tree (if any) to which statements are currently
6639 being added. If there is no active statement-tree, NULL is
6643 current_stmt_tree ()
6645 return &c_stmt_tree;
6648 /* Returns the stack of SCOPE_STMTs for the current function. */
6651 current_scope_stmt_stack ()
6653 return &c_scope_stmt_stack;
6656 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6660 anon_aggr_type_p (node)
6661 tree node ATTRIBUTE_UNUSED;
6666 /* Dummy function in place of callback used by C++. */
6669 extract_interface_info ()
6673 /* Return a new COMPOUND_STMT, after adding it to the current
6677 c_begin_compound_stmt ()
6681 /* Create the COMPOUND_STMT. */
6682 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6687 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6691 c_expand_decl_stmt (t)
6694 tree decl = DECL_STMT_DECL (t);
6696 /* Expand nested functions. */
6697 if (TREE_CODE (decl) == FUNCTION_DECL
6698 && DECL_CONTEXT (decl) == current_function_decl
6699 && DECL_SAVED_TREE (decl))
6700 c_expand_body_1 (decl, 1);
6703 /* Return the global value of T as a symbol. */
6706 identifier_global_value (t)
6709 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6710 if (decl == 0 || DECL_CONTEXT (decl) == 0)
6713 /* Shadowed by something else; find the true global value. */
6714 for (decl = global_binding_level->names; decl; decl = TREE_CHAIN (decl))
6715 if (DECL_NAME (decl) == t)
6718 /* Only local values for this decl. */
6722 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6723 otherwise the name is found in ridpointers from RID_INDEX. */
6726 record_builtin_type (rid_index, name, type)
6733 id = ridpointers[(int) rid_index];
6735 id = get_identifier (name);
6736 pushdecl (build_decl (TYPE_DECL, id, type));
6739 /* Build the void_list_node (void_type_node having been created). */
6741 build_void_list_node ()
6743 tree t = build_tree_list (NULL_TREE, void_type_node);
6747 /* Return something to represent absolute declarators containing a *.
6748 TARGET is the absolute declarator that the * contains.
6749 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6750 to apply to the pointer type, represented as identifiers, possible mixed
6753 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6754 if attributes are present) and whose type is the modifier list. */
6757 make_pointer_declarator (type_quals_attrs, target)
6758 tree type_quals_attrs, target;
6761 tree itarget = target;
6762 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6763 if (attrs != NULL_TREE)
6764 itarget = tree_cons (attrs, target, NULL_TREE);
6765 return build1 (INDIRECT_REF, quals, itarget);
6768 #include "gt-c-decl.h"