1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002 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"
52 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
54 { NORMAL, /* Ordinary declaration */
55 FUNCDEF, /* Function definition */
56 PARM, /* Declaration of parm before function body */
57 FIELD, /* Declaration inside struct or union */
58 BITFIELD, /* Likewise but with specified width */
59 TYPENAME}; /* Typename (inside cast or sizeof) */
62 /* Nonzero if we have seen an invalid cross reference
63 to a struct, union, or enum, but not yet printed the message. */
65 tree pending_invalid_xref;
66 /* File and line to appear in the eventual error message. */
67 const char *pending_invalid_xref_file;
68 int pending_invalid_xref_line;
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 const char *current_function_prototype_file;
104 static int current_function_prototype_line;
106 /* The current statement tree. */
108 static GTY(()) struct stmt_tree_s c_stmt_tree;
110 /* The current scope statement stack. */
112 static GTY(()) tree c_scope_stmt_stack;
114 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
115 that have names. Here so we can clear out their names' definitions
116 at the end of the function. */
118 static GTY(()) tree named_labels;
120 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
122 static GTY(()) tree shadowed_labels;
124 /* Set to 0 at beginning of a function definition, set to 1 if
125 a return statement that specifies a return value is seen. */
127 int current_function_returns_value;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a return statement with no argument is seen. */
132 int current_function_returns_null;
134 /* Set to 0 at beginning of a function definition, set to 1 if
135 a call to a noreturn function is seen. */
137 int current_function_returns_abnormally;
139 /* Set to nonzero by `grokdeclarator' for a function
140 whose return type is defaulted, if warnings for this are desired. */
142 static int warn_about_return_type;
144 /* Nonzero when starting a function declared `extern inline'. */
146 static int current_extern_inline;
148 /* For each binding contour we allocate a binding_level structure
149 * which records the names defined in that contour.
152 * 1) one for each function definition,
153 * where internal declarations of the parameters appear.
154 * 2) one for each compound statement,
155 * to record its declarations.
157 * The current meaning of a name can be found by searching the levels from
158 * the current one out to the global one.
161 /* Note that the information in the `names' component of the global contour
162 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
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 local 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 (except not the global one),
186 a chain of BLOCK nodes for all the levels
187 that were entered and exited one level down. */
190 /* The BLOCK node for this level, if one has been preallocated.
191 If 0, the BLOCK is allocated (if needed) when the level is popped. */
194 /* The binding level which this one is contained in (inherits from). */
195 struct binding_level *level_chain;
197 /* Nonzero for the level that holds the parameters of a function. */
200 /* Nonzero if this level "doesn't exist" for tags. */
201 char tag_transparent;
203 /* Nonzero if sublevels of this level "don't exist" for tags.
204 This is set in the parm level of a function definition
205 while reading the function body, so that the outermost block
206 of the function body will be tag-transparent. */
207 char subblocks_tag_transparent;
209 /* Nonzero means make a BLOCK for this level regardless of all else. */
212 /* Nonzero means make a BLOCK if this level has any subblocks. */
213 char keep_if_subblocks;
215 /* List of decls in `names' that have incomplete structure or
217 tree incomplete_list;
219 /* A list of decls giving the (reversed) specified order of parms,
220 not including any forward-decls in the parmlist.
221 This is so we can put the parms in proper order for assign_parms. */
225 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
227 /* The binding level currently in effect. */
229 static GTY(()) struct binding_level *current_binding_level;
231 /* A chain of binding_level structures awaiting reuse. */
233 static GTY((deletable (""))) struct binding_level *free_binding_level;
235 /* The outermost binding level, for names of file scope.
236 This is created when the compiler is started and exists
237 through the entire run. */
239 static GTY(()) struct binding_level *global_binding_level;
241 /* Binding level structures are initialized by copying this one. */
243 static struct binding_level clear_binding_level
244 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, NULL,
247 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
249 static int keep_next_level_flag;
251 /* Nonzero means make a BLOCK for the next level pushed
252 if it has subblocks. */
254 static int keep_next_if_subblocks;
256 /* The chain of outer levels of label scopes.
257 This uses the same data structure used for binding levels,
258 but it works differently: each link in the chain records
259 saved values of named_labels and shadowed_labels for
260 a label binding level outside the current one. */
262 static GTY(()) struct binding_level *label_level_chain;
264 /* Functions called automatically at the beginning and end of execution. */
266 tree static_ctors, static_dtors;
268 /* Forward declarations. */
270 static struct binding_level * make_binding_level PARAMS ((void));
271 static void pop_binding_level PARAMS ((struct binding_level **));
272 static void clear_limbo_values PARAMS ((tree));
273 static int duplicate_decls PARAMS ((tree, tree, int));
274 static int redeclaration_error_message PARAMS ((tree, tree));
275 static void storedecls PARAMS ((tree));
276 static void storetags PARAMS ((tree));
277 static tree lookup_tag PARAMS ((enum tree_code, tree,
278 struct binding_level *, int));
279 static tree lookup_tag_reverse PARAMS ((tree));
280 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
282 static tree grokparms PARAMS ((tree, int));
283 static void layout_array_type PARAMS ((tree));
284 static tree c_make_fname_decl PARAMS ((tree, int));
285 static void c_expand_body_1 PARAMS ((tree, int));
286 static void warn_if_shadowing PARAMS ((tree, tree));
287 static bool flexible_array_type_p PARAMS ((tree));
289 /* States indicating how grokdeclarator() should handle declspecs marked
290 with __attribute__((deprecated)). An object declared as
291 __attribute__((deprecated)) suppresses warnings of uses of other
294 enum deprecated_states {
299 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
302 c_print_identifier (file, node, indent)
307 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
308 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
309 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
310 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
311 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
312 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
313 if (C_IS_RESERVED_WORD (node))
315 tree rid = ridpointers[C_RID_CODE (node)];
316 indent_to (file, indent + 4);
317 fprintf (file, "rid ");
318 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
319 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
323 /* Hook called at end of compilation to assume 1 elt
324 for a top-level tentative array defn that wasn't complete before. */
327 c_finish_incomplete_decl (decl)
330 if (TREE_CODE (decl) == VAR_DECL)
332 tree type = TREE_TYPE (decl);
333 if (type != error_mark_node
334 && TREE_CODE (type) == ARRAY_TYPE
335 && ! DECL_EXTERNAL (decl)
336 && TYPE_DOMAIN (type) == 0)
338 warning_with_decl (decl, "array `%s' assumed to have one element");
340 complete_array_type (type, NULL_TREE, 1);
342 layout_decl (decl, 0);
347 /* Reuse or create a struct for this binding level. */
349 static struct binding_level *
350 make_binding_level ()
352 if (free_binding_level)
354 struct binding_level *result = free_binding_level;
355 free_binding_level = result->level_chain;
359 return (struct binding_level *) ggc_alloc (sizeof (struct binding_level));
362 /* Remove a binding level from a list and add it to the level chain. */
365 pop_binding_level (lp)
366 struct binding_level **lp;
368 struct binding_level *l = *lp;
369 *lp = l->level_chain;
371 memset (l, 0, sizeof (struct binding_level));
372 l->level_chain = free_binding_level;
373 free_binding_level = l;
376 /* Nonzero if we are currently in the global binding level. */
381 return current_binding_level == global_binding_level;
387 keep_next_level_flag = 1;
390 /* Nonzero if the current level needs to have a BLOCK made. */
395 return ((current_binding_level->keep_if_subblocks
396 && current_binding_level->blocks != 0)
397 || current_binding_level->keep
398 || current_binding_level->names != 0
399 || (current_binding_level->tags != 0
400 && !current_binding_level->tag_transparent));
403 /* Identify this binding level as a level of parameters.
404 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
405 But it turns out there is no way to pass the right value for
406 DEFINITION_FLAG, so we ignore it. */
409 declare_parm_level (definition_flag)
410 int definition_flag ATTRIBUTE_UNUSED;
412 current_binding_level->parm_flag = 1;
415 /* Nonzero if currently making parm declarations. */
420 return current_binding_level->parm_flag;
423 /* Enter a new binding level.
424 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
425 not for that of tags. */
428 pushlevel (tag_transparent)
431 struct binding_level *newlevel = NULL_BINDING_LEVEL;
433 /* If this is the top level of a function,
434 just make sure that NAMED_LABELS is 0. */
436 if (current_binding_level == global_binding_level)
441 newlevel = make_binding_level ();
443 /* Add this level to the front of the chain (stack) of levels that
446 *newlevel = clear_binding_level;
447 newlevel->tag_transparent
449 || (current_binding_level
450 ? current_binding_level->subblocks_tag_transparent
452 newlevel->level_chain = current_binding_level;
453 current_binding_level = newlevel;
454 newlevel->keep = keep_next_level_flag;
455 keep_next_level_flag = 0;
456 newlevel->keep_if_subblocks = keep_next_if_subblocks;
457 keep_next_if_subblocks = 0;
460 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
463 clear_limbo_values (block)
468 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
469 if (DECL_NAME (tem) != 0)
470 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
472 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
473 clear_limbo_values (tem);
476 /* Exit a binding level.
477 Pop the level off, and restore the state of the identifier-decl mappings
478 that were in effect when this level was entered.
480 If KEEP is nonzero, this level had explicit declarations, so
481 and create a "block" (a BLOCK node) for the level
482 to record its declarations and subblocks for symbol table output.
484 If FUNCTIONBODY is nonzero, this level is the body of a function,
485 so create a block as if KEEP were set and also clear out all
488 If REVERSE is nonzero, reverse the order of decls before putting
489 them into the BLOCK. */
492 poplevel (keep, reverse, functionbody)
498 /* The chain of decls was accumulated in reverse order.
499 Put it into forward order, just for cleanliness. */
501 tree tags = current_binding_level->tags;
502 tree subblocks = current_binding_level->blocks;
505 int block_previously_created;
507 keep |= current_binding_level->keep;
509 /* This warning is turned off because it causes warnings for
510 declarations like `extern struct foo *x'. */
512 /* Warn about incomplete structure types in this level. */
513 for (link = tags; link; link = TREE_CHAIN (link))
514 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
516 tree type = TREE_VALUE (link);
517 tree type_name = TYPE_NAME (type);
518 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
520 : DECL_NAME (type_name));
521 switch (TREE_CODE (type))
524 error ("`struct %s' incomplete in scope ending here", id);
527 error ("`union %s' incomplete in scope ending here", id);
530 error ("`enum %s' incomplete in scope ending here", id);
536 /* Get the decls in the order they were written.
537 Usually current_binding_level->names is in reverse order.
538 But parameter decls were previously put in forward order. */
541 current_binding_level->names
542 = decls = nreverse (current_binding_level->names);
544 decls = current_binding_level->names;
546 /* Output any nested inline functions within this block
547 if they weren't already output. */
549 for (decl = decls; decl; decl = TREE_CHAIN (decl))
550 if (TREE_CODE (decl) == FUNCTION_DECL
551 && ! TREE_ASM_WRITTEN (decl)
552 && DECL_INITIAL (decl) != 0
553 && TREE_ADDRESSABLE (decl))
555 /* If this decl was copied from a file-scope decl
556 on account of a block-scope extern decl,
557 propagate TREE_ADDRESSABLE to the file-scope decl.
559 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
560 true, since then the decl goes through save_for_inline_copying. */
561 if (DECL_ABSTRACT_ORIGIN (decl) != 0
562 && DECL_ABSTRACT_ORIGIN (decl) != decl)
563 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
566 /* We used to warn about unused variables in expand_end_bindings,
567 i.e. while generating RTL. But in function-at-a-time mode we may
568 choose to never expand a function at all (e.g. auto inlining), so
569 we do this explicitly now. */
570 warn_about_unused_variables (getdecls ());
572 /* If there were any declarations or structure tags in that level,
573 or if this level is a function body,
574 create a BLOCK to record them for the life of this function. */
577 block_previously_created = (current_binding_level->this_block != 0);
578 if (block_previously_created)
579 block = current_binding_level->this_block;
580 else if (keep || functionbody
581 || (current_binding_level->keep_if_subblocks && subblocks != 0))
582 block = make_node (BLOCK);
585 BLOCK_VARS (block) = decls;
586 BLOCK_SUBBLOCKS (block) = subblocks;
589 /* In each subblock, record that this is its superior. */
591 for (link = subblocks; link; link = TREE_CHAIN (link))
592 BLOCK_SUPERCONTEXT (link) = block;
594 /* Clear out the meanings of the local variables of this level. */
596 for (link = decls; link; link = TREE_CHAIN (link))
598 if (DECL_NAME (link) != 0)
600 /* If the ident. was used or addressed via a local extern decl,
601 don't forget that fact. */
602 if (DECL_EXTERNAL (link))
604 if (TREE_USED (link))
605 TREE_USED (DECL_NAME (link)) = 1;
606 if (TREE_ADDRESSABLE (link))
607 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
609 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
613 /* Restore all name-meanings of the outer levels
614 that were shadowed by this level. */
616 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
617 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
619 /* If the level being exited is the top level of a function,
620 check over all the labels, and clear out the current
621 (function local) meanings of their names. */
625 clear_limbo_values (block);
627 /* If this is the top level block of a function,
628 the vars are the function's parameters.
629 Don't leave them in the BLOCK because they are
630 found in the FUNCTION_DECL instead. */
632 BLOCK_VARS (block) = 0;
634 /* Clear out the definitions of all label names,
635 since their scopes end here,
636 and add them to BLOCK_VARS. */
638 for (link = named_labels; link; link = TREE_CHAIN (link))
640 tree label = TREE_VALUE (link);
642 if (DECL_INITIAL (label) == 0)
644 error_with_decl (label, "label `%s' used but not defined");
645 /* Avoid crashing later. */
646 define_label (input_filename, lineno,
649 else if (warn_unused_label && !TREE_USED (label))
650 warning_with_decl (label, "label `%s' defined but not used");
651 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
653 /* Put the labels into the "variables" of the
654 top-level block, so debugger can see them. */
655 TREE_CHAIN (label) = BLOCK_VARS (block);
656 BLOCK_VARS (block) = label;
660 /* Pop the current level, and free the structure for reuse. */
662 pop_binding_level (¤t_binding_level);
664 /* Dispose of the block that we just made inside some higher level. */
666 DECL_INITIAL (current_function_decl) = block;
669 if (!block_previously_created)
670 current_binding_level->blocks
671 = chainon (current_binding_level->blocks, block);
673 /* If we did not make a block for the level just exited,
674 any blocks made for inner levels
675 (since they cannot be recorded as subblocks in that level)
676 must be carried forward so they will later become subblocks
677 of something else. */
679 current_binding_level->blocks
680 = chainon (current_binding_level->blocks, subblocks);
682 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
683 binding contour so that they point to the appropriate construct, i.e.
684 either to the current FUNCTION_DECL node, or else to the BLOCK node
687 Note that for tagged types whose scope is just the formal parameter
688 list for some function type specification, we can't properly set
689 their TYPE_CONTEXTs here, because we don't have a pointer to the
690 appropriate FUNCTION_TYPE node readily available to us. For those
691 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
692 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
693 node which will represent the "scope" for these "parameter list local"
697 for (link = tags; link; link = TREE_CHAIN (link))
698 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
700 for (link = tags; link; link = TREE_CHAIN (link))
701 TYPE_CONTEXT (TREE_VALUE (link)) = block;
704 TREE_USED (block) = 1;
709 /* Insert BLOCK at the end of the list of subblocks of the
710 current binding level. This is used when a BIND_EXPR is expanded,
711 to handle the BLOCK node inside the BIND_EXPR. */
717 TREE_USED (block) = 1;
718 current_binding_level->blocks
719 = chainon (current_binding_level->blocks, block);
722 /* Set the BLOCK node for the innermost scope
723 (the one we are currently in). */
729 current_binding_level->this_block = block;
730 current_binding_level->names = chainon (current_binding_level->names,
732 current_binding_level->blocks = chainon (current_binding_level->blocks,
733 BLOCK_SUBBLOCKS (block));
739 struct binding_level *newlevel;
741 newlevel = make_binding_level ();
743 /* Add this level to the front of the chain (stack) of label levels. */
745 newlevel->level_chain = label_level_chain;
746 label_level_chain = newlevel;
748 newlevel->names = named_labels;
749 newlevel->shadowed = shadowed_labels;
757 struct binding_level *level = label_level_chain;
760 /* Clear out the definitions of the declared labels in this level.
761 Leave in the list any ordinary, non-declared labels. */
762 for (link = named_labels, prev = 0; link;)
764 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
766 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
768 error_with_decl (TREE_VALUE (link),
769 "label `%s' used but not defined");
770 /* Avoid crashing later. */
771 define_label (input_filename, lineno,
772 DECL_NAME (TREE_VALUE (link)));
774 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
775 warning_with_decl (TREE_VALUE (link),
776 "label `%s' defined but not used");
777 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
779 /* Delete this element from the list. */
780 link = TREE_CHAIN (link);
782 TREE_CHAIN (prev) = link;
789 link = TREE_CHAIN (link);
793 /* Bring back all the labels that were shadowed. */
794 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
795 if (DECL_NAME (TREE_VALUE (link)) != 0)
796 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
799 named_labels = chainon (named_labels, level->names);
800 shadowed_labels = level->shadowed;
802 /* Pop the current level, and free the structure for reuse. */
803 pop_binding_level (&label_level_chain);
806 /* Push a definition or a declaration of struct, union or enum tag "name".
807 "type" should be the type node.
808 We assume that the tag "name" is not already defined.
810 Note that the definition may really be just a forward reference.
811 In that case, the TYPE_SIZE will be zero. */
817 struct binding_level *b;
819 /* Find the proper binding level for this type tag. */
821 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
826 /* Record the identifier as the type's name if it has none. */
828 if (TYPE_NAME (type) == 0)
829 TYPE_NAME (type) = name;
832 b->tags = tree_cons (name, type, b->tags);
834 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
835 tagged type we just added to the current binding level. This fake
836 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
837 to output a representation of a tagged type, and it also gives
838 us a convenient place to record the "scope start" address for the
841 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
843 /* An approximation for now, so we can tell this is a function-scope tag.
844 This will be updated in poplevel. */
845 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
848 /* Handle when a new declaration NEWDECL
849 has the same name as an old one OLDDECL
850 in the same binding contour.
851 Prints an error message if appropriate.
853 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
856 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
857 and OLDDECL is in an outer binding level and should thus not be changed. */
860 duplicate_decls (newdecl, olddecl, different_binding_level)
861 tree newdecl, olddecl;
862 int different_binding_level;
864 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
865 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
866 && DECL_INITIAL (newdecl) != 0);
867 tree oldtype = TREE_TYPE (olddecl);
868 tree newtype = TREE_TYPE (newdecl);
871 if (DECL_P (olddecl))
873 if (TREE_CODE (newdecl) == FUNCTION_DECL
874 && TREE_CODE (olddecl) == FUNCTION_DECL
875 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
877 if (DECL_DECLARED_INLINE_P (newdecl)
878 && DECL_UNINLINABLE (newdecl)
879 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
880 /* Already warned elsewhere. */;
881 else if (DECL_DECLARED_INLINE_P (olddecl)
882 && DECL_UNINLINABLE (olddecl)
883 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
884 /* Already warned. */;
885 else if (DECL_DECLARED_INLINE_P (newdecl)
886 && ! DECL_DECLARED_INLINE_P (olddecl)
887 && DECL_UNINLINABLE (olddecl)
888 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
890 warning_with_decl (newdecl,
891 "function `%s' redeclared as inline");
892 warning_with_decl (olddecl,
893 "previous declaration of function `%s' with attribute noinline");
895 else if (DECL_DECLARED_INLINE_P (olddecl)
896 && DECL_UNINLINABLE (newdecl)
897 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
899 warning_with_decl (newdecl,
900 "function `%s' redeclared with attribute noinline");
901 warning_with_decl (olddecl,
902 "previous declaration of function `%s' was inline");
906 DECL_ATTRIBUTES (newdecl)
907 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
910 if (TREE_CODE (newtype) == ERROR_MARK
911 || TREE_CODE (oldtype) == ERROR_MARK)
914 /* New decl is completely inconsistent with the old one =>
915 tell caller to replace the old one.
916 This is always an error except in the case of shadowing a builtin. */
917 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
919 if (TREE_CODE (olddecl) == FUNCTION_DECL
920 && (DECL_BUILT_IN (olddecl)
921 || DECL_BUILT_IN_NONANSI (olddecl)))
923 /* If you declare a built-in or predefined function name as static,
924 the old definition is overridden,
925 but optionally warn this was a bad choice of name. */
926 if (!TREE_PUBLIC (newdecl))
930 else if (DECL_BUILT_IN (olddecl))
931 warning_with_decl (newdecl, "shadowing built-in function `%s'");
933 warning_with_decl (newdecl, "shadowing library function `%s'");
935 /* Likewise, if the built-in is not ansi, then programs can
936 override it even globally without an error. */
937 else if (! DECL_BUILT_IN (olddecl))
938 warning_with_decl (newdecl,
939 "library function `%s' declared as non-function");
941 else if (DECL_BUILT_IN_NONANSI (olddecl))
942 warning_with_decl (newdecl,
943 "built-in function `%s' declared as non-function");
945 warning_with_decl (newdecl,
946 "built-in function `%s' declared as non-function");
950 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
951 error_with_decl (olddecl, "previous declaration of `%s'");
957 /* For real parm decl following a forward decl,
958 return 1 so old decl will be reused. */
959 if (types_match && TREE_CODE (newdecl) == PARM_DECL
960 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
963 /* The new declaration is the same kind of object as the old one.
964 The declarations may partially match. Print warnings if they don't
965 match enough. Ultimately, copy most of the information from the new
966 decl to the old one, and keep using the old one. */
968 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
970 /* A function declaration for a built-in function. */
971 if (!TREE_PUBLIC (newdecl))
973 /* If you declare a built-in function name as static, the
974 built-in definition is overridden,
975 but optionally warn this was a bad choice of name. */
977 warning_with_decl (newdecl, "shadowing built-in function `%s'");
978 /* Discard the old built-in function. */
981 else if (!types_match)
983 /* Accept the return type of the new declaration if same modes. */
984 tree oldreturntype = TREE_TYPE (oldtype);
985 tree newreturntype = TREE_TYPE (newtype);
987 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
989 /* Function types may be shared, so we can't just modify
990 the return type of olddecl's function type. */
992 = build_function_type (newreturntype,
993 TYPE_ARG_TYPES (oldtype));
994 trytype = build_type_attribute_variant (trytype,
995 TYPE_ATTRIBUTES (oldtype));
997 types_match = comptypes (newtype, trytype);
1001 /* Accept harmless mismatch in first argument type also.
1002 This is for the ffs and fprintf builtins. */
1003 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1004 && TYPE_ARG_TYPES (oldtype) != 0
1005 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1006 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1007 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1008 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1010 /* Function types may be shared, so we can't just modify
1011 the return type of olddecl's function type. */
1013 = build_function_type (TREE_TYPE (oldtype),
1014 tree_cons (NULL_TREE,
1015 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1016 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1017 trytype = build_type_attribute_variant (trytype,
1018 TYPE_ATTRIBUTES (oldtype));
1020 types_match = comptypes (newtype, trytype);
1024 if (! different_binding_level)
1025 TREE_TYPE (olddecl) = oldtype;
1027 else if (TYPE_ARG_TYPES (oldtype) == NULL
1028 && TYPE_ARG_TYPES (newtype) != NULL)
1030 /* For bcmp, bzero, fputs the builtin type has arguments not
1031 specified. Use the ones from the prototype so that type checking
1032 is done for them. */
1034 = build_function_type (TREE_TYPE (oldtype),
1035 TYPE_ARG_TYPES (newtype));
1036 trytype = build_type_attribute_variant (trytype,
1037 TYPE_ATTRIBUTES (oldtype));
1040 if (! different_binding_level)
1041 TREE_TYPE (olddecl) = oldtype;
1045 /* If types don't match for a built-in, throw away the built-in. */
1046 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1050 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1051 && DECL_SOURCE_LINE (olddecl) == 0)
1053 /* A function declaration for a predeclared function
1054 that isn't actually built in. */
1055 if (!TREE_PUBLIC (newdecl))
1057 /* If you declare it as static, the
1058 default definition is overridden. */
1061 else if (!types_match)
1063 /* If the types don't match, preserve volatility indication.
1064 Later on, we will discard everything else about the
1065 default declaration. */
1066 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1069 /* Permit char *foo () to match void *foo (...) if not pedantic,
1070 if one of them came from a system header file. */
1071 else if (!types_match
1072 && TREE_CODE (olddecl) == FUNCTION_DECL
1073 && TREE_CODE (newdecl) == FUNCTION_DECL
1074 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1075 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1076 && (DECL_IN_SYSTEM_HEADER (olddecl)
1077 || DECL_IN_SYSTEM_HEADER (newdecl))
1078 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1079 && TYPE_ARG_TYPES (oldtype) == 0
1080 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1081 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1083 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1084 && TYPE_ARG_TYPES (newtype) == 0
1085 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1086 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1089 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1090 /* Make sure we keep void * as ret type, not char *. */
1091 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1092 TREE_TYPE (newdecl) = newtype = oldtype;
1094 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1095 we will come back here again. */
1096 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1098 else if (!types_match
1099 /* Permit char *foo (int, ...); followed by char *foo ();
1101 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1103 /* Return types must still match. */
1104 && comptypes (TREE_TYPE (oldtype),
1105 TREE_TYPE (newtype))
1106 && TYPE_ARG_TYPES (newtype) == 0))
1108 error_with_decl (newdecl, "conflicting types for `%s'");
1109 /* Check for function type mismatch
1110 involving an empty arglist vs a nonempty one. */
1111 if (TREE_CODE (olddecl) == FUNCTION_DECL
1112 && comptypes (TREE_TYPE (oldtype),
1113 TREE_TYPE (newtype))
1114 && ((TYPE_ARG_TYPES (oldtype) == 0
1115 && DECL_INITIAL (olddecl) == 0)
1117 (TYPE_ARG_TYPES (newtype) == 0
1118 && DECL_INITIAL (newdecl) == 0)))
1120 /* Classify the problem further. */
1121 tree t = TYPE_ARG_TYPES (oldtype);
1123 t = TYPE_ARG_TYPES (newtype);
1124 for (; t; t = TREE_CHAIN (t))
1126 tree type = TREE_VALUE (t);
1128 if (TREE_CHAIN (t) == 0
1129 && TYPE_MAIN_VARIANT (type) != void_type_node)
1131 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1135 if (c_type_promotes_to (type) != type)
1137 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1142 error_with_decl (olddecl, "previous declaration of `%s'");
1144 /* This is safer because the initializer might contain references
1145 to variables that were declared between olddecl and newdecl. This
1146 will make the initializer invalid for olddecl in case it gets
1147 assigned to olddecl below. */
1148 DECL_INITIAL (newdecl) = 0;
1150 /* TLS cannot follow non-TLS declaration. */
1151 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1152 && !DECL_THREAD_LOCAL (olddecl) && DECL_THREAD_LOCAL (newdecl))
1154 error_with_decl (newdecl, "thread-local declaration of `%s' follows non thread-local declaration");
1155 error_with_decl (olddecl, "previous declaration of `%s'");
1157 /* non-TLS declaration cannot follow TLS declaration. */
1158 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1159 && DECL_THREAD_LOCAL (olddecl) && !DECL_THREAD_LOCAL (newdecl))
1161 error_with_decl (newdecl, "non thread-local declaration of `%s' follows thread-local declaration");
1162 error_with_decl (olddecl, "previous declaration of `%s'");
1166 errmsg = redeclaration_error_message (newdecl, olddecl);
1172 error_with_decl (newdecl, "redefinition of `%s'");
1175 error_with_decl (newdecl, "redeclaration of `%s'");
1178 error_with_decl (newdecl, "conflicting declarations of `%s'");
1184 error_with_decl (olddecl,
1185 ((DECL_INITIAL (olddecl)
1186 && current_binding_level == global_binding_level)
1187 ? "`%s' previously defined here"
1188 : "`%s' previously declared here"));
1191 else if (TREE_CODE (newdecl) == TYPE_DECL
1192 && (DECL_IN_SYSTEM_HEADER (olddecl)
1193 || DECL_IN_SYSTEM_HEADER (newdecl)))
1195 warning_with_decl (newdecl, "redefinition of `%s'");
1198 ((DECL_INITIAL (olddecl)
1199 && current_binding_level == global_binding_level)
1200 ? "`%s' previously defined here"
1201 : "`%s' previously declared here"));
1203 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1204 && DECL_INITIAL (olddecl) != 0
1205 && TYPE_ARG_TYPES (oldtype) == 0
1206 && TYPE_ARG_TYPES (newtype) != 0
1207 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1211 /* Prototype decl follows defn w/o prototype. */
1213 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1214 type = TYPE_ARG_TYPES (newtype),
1217 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1219 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1220 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1222 warning_with_decl (newdecl, "prototype for `%s' follows");
1223 warning_with_decl (olddecl, "non-prototype definition here");
1226 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1227 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1229 error_with_decl (newdecl,
1230 "prototype for `%s' follows and number of arguments doesn't match");
1231 error_with_decl (olddecl, "non-prototype definition here");
1235 /* Type for passing arg must be consistent
1236 with that declared for the arg. */
1237 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)))
1239 error_with_decl (newdecl,
1240 "prototype for `%s' follows and argument %d doesn't match",
1242 error_with_decl (olddecl, "non-prototype definition here");
1248 /* Warn about mismatches in various flags. */
1251 /* Warn if function is now inline
1252 but was previously declared not inline and has been called. */
1253 if (TREE_CODE (olddecl) == FUNCTION_DECL
1254 && ! DECL_DECLARED_INLINE_P (olddecl)
1255 && DECL_DECLARED_INLINE_P (newdecl)
1256 && TREE_USED (olddecl))
1257 warning_with_decl (newdecl,
1258 "`%s' declared inline after being called");
1259 if (TREE_CODE (olddecl) == FUNCTION_DECL
1260 && ! DECL_DECLARED_INLINE_P (olddecl)
1261 && DECL_DECLARED_INLINE_P (newdecl)
1262 && DECL_INITIAL (olddecl) != 0)
1263 warning_with_decl (newdecl,
1264 "`%s' declared inline after its definition");
1266 /* If pedantic, warn when static declaration follows a non-static
1267 declaration. Otherwise, do so only for functions. */
1268 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1269 && TREE_PUBLIC (olddecl)
1270 && !TREE_PUBLIC (newdecl))
1271 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1273 /* If warn_traditional, warn when a non-static function
1274 declaration follows a static one. */
1275 if (warn_traditional && !in_system_header
1276 && TREE_CODE (olddecl) == FUNCTION_DECL
1277 && !TREE_PUBLIC (olddecl)
1278 && TREE_PUBLIC (newdecl))
1279 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1281 /* Warn when const declaration follows a non-const
1282 declaration, but not for functions. */
1283 if (TREE_CODE (olddecl) != FUNCTION_DECL
1284 && !TREE_READONLY (olddecl)
1285 && TREE_READONLY (newdecl))
1286 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1287 /* These bits are logically part of the type, for variables.
1288 But not for functions
1289 (where qualifiers are not valid ANSI anyway). */
1290 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1291 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1292 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1293 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1297 /* Optionally warn about more than one declaration for the same name. */
1298 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1299 /* Don't warn about a function declaration
1300 followed by a definition. */
1301 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1302 && DECL_INITIAL (olddecl) == 0)
1303 /* Don't warn about extern decl followed by (tentative) definition. */
1304 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1306 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1307 warning_with_decl (olddecl, "previous declaration of `%s'");
1310 /* Copy all the DECL_... slots specified in the new decl
1311 except for any that we copy here from the old type.
1313 Past this point, we don't change OLDTYPE and NEWTYPE
1314 even if we change the types of NEWDECL and OLDDECL. */
1318 /* When copying info to olddecl, we store into write_olddecl
1319 instead. This allows us to avoid modifying olddecl when
1320 different_binding_level is true. */
1321 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1323 /* Merge the data types specified in the two decls. */
1324 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1326 if (different_binding_level)
1328 if (TYPE_ARG_TYPES (oldtype) != 0
1329 && TYPE_ARG_TYPES (newtype) == 0)
1330 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1333 = build_type_attribute_variant
1335 merge_attributes (TYPE_ATTRIBUTES (newtype),
1336 TYPE_ATTRIBUTES (oldtype)));
1340 = TREE_TYPE (olddecl)
1341 = common_type (newtype, oldtype);
1344 /* Lay the type out, unless already done. */
1345 if (oldtype != TREE_TYPE (newdecl))
1347 if (TREE_TYPE (newdecl) != error_mark_node)
1348 layout_type (TREE_TYPE (newdecl));
1349 if (TREE_CODE (newdecl) != FUNCTION_DECL
1350 && TREE_CODE (newdecl) != TYPE_DECL
1351 && TREE_CODE (newdecl) != CONST_DECL)
1352 layout_decl (newdecl, 0);
1356 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1357 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1358 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1359 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1360 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1361 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1363 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1364 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1368 /* Keep the old rtl since we can safely use it. */
1369 COPY_DECL_RTL (olddecl, newdecl);
1371 /* Merge the type qualifiers. */
1372 if (TREE_READONLY (newdecl))
1373 TREE_READONLY (write_olddecl) = 1;
1375 if (TREE_THIS_VOLATILE (newdecl))
1377 TREE_THIS_VOLATILE (write_olddecl) = 1;
1378 if (TREE_CODE (newdecl) == VAR_DECL
1379 /* If an automatic variable is re-declared in the same
1380 function scope, but the old declaration was not
1381 volatile, make_var_volatile() would crash because the
1382 variable would have been assigned to a pseudo, not a
1383 MEM. Since this duplicate declaration is invalid
1384 anyway, we just skip the call. */
1386 make_var_volatile (newdecl);
1389 /* Keep source location of definition rather than declaration. */
1390 /* When called with different_binding_level set, keep the old
1391 information so that meaningful diagnostics can be given. */
1392 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1393 && ! different_binding_level)
1395 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1396 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1399 /* Merge the unused-warning information. */
1400 if (DECL_IN_SYSTEM_HEADER (olddecl))
1401 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1402 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1403 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1405 /* Merge the initialization information. */
1406 /* When called with different_binding_level set, don't copy over
1407 DECL_INITIAL, so that we don't accidentally change function
1408 declarations into function definitions. */
1409 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1410 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1412 /* Merge the section attribute.
1413 We want to issue an error if the sections conflict but that must be
1414 done later in decl_attributes since we are called before attributes
1416 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1417 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1419 /* Copy the assembler name.
1420 Currently, it can only be defined in the prototype. */
1421 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1423 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1425 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1426 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1427 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1428 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1429 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1432 /* If cannot merge, then use the new type and qualifiers,
1433 and don't preserve the old rtl. */
1434 else if (! different_binding_level)
1436 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1437 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1438 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1439 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1442 /* Merge the storage class information. */
1443 merge_weak (newdecl, olddecl);
1445 /* For functions, static overrides non-static. */
1446 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1448 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1449 /* This is since we don't automatically
1450 copy the attributes of NEWDECL into OLDDECL. */
1451 /* No need to worry about different_binding_level here because
1452 then TREE_PUBLIC (newdecl) was true. */
1453 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1454 /* If this clears `static', clear it in the identifier too. */
1455 if (! TREE_PUBLIC (olddecl))
1456 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1458 if (DECL_EXTERNAL (newdecl))
1460 if (! different_binding_level)
1462 /* Don't mess with these flags on local externs; they remain
1463 external even if there's a declaration at file scope which
1465 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1466 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1468 /* An extern decl does not override previous storage class. */
1469 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1470 if (! DECL_EXTERNAL (newdecl))
1471 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1475 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1476 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1479 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1481 /* If we're redefining a function previously defined as extern
1482 inline, make sure we emit debug info for the inline before we
1483 throw it away, in case it was inlined into a function that hasn't
1484 been written out yet. */
1485 if (new_is_definition && DECL_INITIAL (olddecl))
1487 if (TREE_USED (olddecl))
1488 (*debug_hooks->outlining_inline_function) (olddecl);
1490 /* The new defn must not be inline. */
1491 DECL_INLINE (newdecl) = 0;
1492 DECL_UNINLINABLE (newdecl) = 1;
1496 /* If either decl says `inline', this fn is inline,
1497 unless its definition was passed already. */
1498 if (DECL_DECLARED_INLINE_P (newdecl)
1499 || DECL_DECLARED_INLINE_P (olddecl))
1500 DECL_DECLARED_INLINE_P (newdecl) = 1;
1502 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1503 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1506 if (DECL_BUILT_IN (olddecl))
1508 /* Get rid of any built-in function if new arg types don't match it
1509 or if we have a function definition. */
1510 if (! types_match || new_is_definition)
1512 if (! different_binding_level)
1514 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1515 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1520 /* If redeclaring a builtin function, and not a definition,
1521 it stays built in. */
1522 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1523 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1527 /* Also preserve various other info from the definition. */
1528 if (! new_is_definition)
1530 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1531 /* When called with different_binding_level set, don't copy over
1532 DECL_INITIAL, so that we don't accidentally change function
1533 declarations into function definitions. */
1534 if (! different_binding_level)
1535 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1536 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1537 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1538 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
1539 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1541 /* Set DECL_INLINE on the declaration if we've got a body
1542 from which to instantiate. */
1543 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1545 DECL_INLINE (newdecl) = 1;
1546 DECL_ABSTRACT_ORIGIN (newdecl)
1547 = (different_binding_level
1548 ? DECL_ORIGIN (olddecl)
1549 : DECL_ABSTRACT_ORIGIN (olddecl));
1554 /* If a previous declaration said inline, mark the
1555 definition as inlinable. */
1556 if (DECL_DECLARED_INLINE_P (newdecl)
1557 && ! DECL_UNINLINABLE (newdecl))
1558 DECL_INLINE (newdecl) = 1;
1561 if (different_binding_level)
1564 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1565 But preserve OLDDECL's DECL_UID. */
1567 unsigned olddecl_uid = DECL_UID (olddecl);
1569 memcpy ((char *) olddecl + sizeof (struct tree_common),
1570 (char *) newdecl + sizeof (struct tree_common),
1571 sizeof (struct tree_decl) - sizeof (struct tree_common));
1572 DECL_UID (olddecl) = olddecl_uid;
1575 /* NEWDECL contains the merged attribute lists.
1576 Update OLDDECL to be the same. */
1577 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1582 /* Check whether decl-node X shadows an existing declaration.
1583 OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
1584 which might be a NULL_TREE. */
1586 warn_if_shadowing (x, oldlocal)
1591 if (DECL_EXTERNAL (x))
1594 name = DECL_NAME (x);
1596 /* Warn if shadowing an argument at the top level of the body. */
1598 /* This warning doesn't apply to the parms of a nested fcn. */
1599 && ! current_binding_level->parm_flag
1600 /* Check that this is one level down from the parms. */
1601 && current_binding_level->level_chain->parm_flag
1602 /* Check that the decl being shadowed
1603 comes from the parm level, one level up. */
1604 && chain_member (oldlocal, current_binding_level->level_chain->names))
1606 if (TREE_CODE (oldlocal) == PARM_DECL)
1607 pedwarn ("declaration of `%s' shadows a parameter",
1608 IDENTIFIER_POINTER (name));
1610 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
1611 IDENTIFIER_POINTER (name));
1613 /* Maybe warn if shadowing something else. */
1614 else if (warn_shadow
1615 /* No shadow warnings for internally generated vars. */
1616 && DECL_SOURCE_LINE (x) != 0
1617 /* No shadow warnings for vars made for inlining. */
1618 && ! DECL_FROM_INLINE (x))
1620 if (TREE_CODE (x) == PARM_DECL
1621 && current_binding_level->level_chain->parm_flag)
1622 /* Don't warn about the parm names in function declarator
1623 within a function declarator.
1624 It would be nice to avoid warning in any function
1625 declarator in a declaration, as opposed to a definition,
1626 but there is no way to tell it's not a definition. */
1630 if (TREE_CODE (oldlocal) == PARM_DECL)
1631 shadow_warning ("a parameter", name, oldlocal);
1633 shadow_warning ("a previous local", name, oldlocal);
1635 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
1636 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
1637 shadow_warning ("a global declaration", name,
1638 IDENTIFIER_GLOBAL_VALUE (name));
1642 /* Record a decl-node X as belonging to the current lexical scope.
1643 Check for errors (such as an incompatible declaration for the same
1644 name already seen in the same scope).
1646 Returns either X or an old decl for the same name.
1647 If an old decl is returned, it may have been smashed
1648 to agree with what X says. */
1655 tree name = DECL_NAME (x);
1656 struct binding_level *b = current_binding_level;
1658 /* Functions need the lang_decl data. */
1659 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1660 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
1661 ggc_alloc_cleared (sizeof (struct lang_decl));
1663 DECL_CONTEXT (x) = current_function_decl;
1664 /* A local extern declaration for a function doesn't constitute nesting.
1665 A local auto declaration does, since it's a forward decl
1666 for a nested function coming later. */
1667 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1668 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
1669 DECL_CONTEXT (x) = 0;
1673 int different_binding_level = 0;
1675 if (warn_nested_externs
1676 && DECL_EXTERNAL (x)
1677 && b != global_binding_level
1678 && x != IDENTIFIER_IMPLICIT_DECL (name)
1679 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
1680 && !DECL_IN_SYSTEM_HEADER (x))
1681 warning ("nested extern declaration of `%s'",
1682 IDENTIFIER_POINTER (name));
1684 t = lookup_name_current_level (name);
1685 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
1687 t = IDENTIFIER_GLOBAL_VALUE (name);
1688 /* Type decls at global scope don't conflict with externs declared
1689 inside lexical blocks. */
1690 if (! t || TREE_CODE (t) == TYPE_DECL)
1691 /* If there's no visible global declaration, try for an
1693 t = IDENTIFIER_LIMBO_VALUE (name);
1694 different_binding_level = 1;
1696 if (t != 0 && t == error_mark_node)
1697 /* error_mark_node is 0 for a while during initialization! */
1700 error_with_decl (x, "`%s' used prior to declaration");
1703 /* If this decl is `static' and an implicit decl was seen previously,
1705 if (TREE_PUBLIC (name)
1706 /* Don't test for DECL_EXTERNAL, because grokdeclarator
1707 sets this for all functions. */
1708 && ! TREE_PUBLIC (x)
1709 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
1710 /* We used to warn also for explicit extern followed by static,
1711 but sometimes you need to do it that way. */
1712 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
1714 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1715 IDENTIFIER_POINTER (name));
1716 pedwarn_with_file_and_line
1717 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
1718 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
1719 "previous declaration of `%s'",
1720 IDENTIFIER_POINTER (name));
1721 TREE_THIS_VOLATILE (name) = 1;
1724 if (t != 0 && duplicate_decls (x, t, different_binding_level))
1726 if (TREE_CODE (t) == PARM_DECL)
1728 /* Don't allow more than one "real" duplicate
1729 of a forward parm decl. */
1730 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
1736 /* If we are processing a typedef statement, generate a whole new
1737 ..._TYPE node (which will be just a variant of the existing
1738 ..._TYPE node with identical properties) and then install the
1739 TYPE_DECL node generated to represent the typedef name as the
1740 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1742 The whole point here is to end up with a situation where each
1743 and every ..._TYPE node the compiler creates will be uniquely
1744 associated with AT MOST one node representing a typedef name.
1745 This way, even though the compiler substitutes corresponding
1746 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1747 early on, later parts of the compiler can always do the reverse
1748 translation and get back the corresponding typedef name. For
1751 typedef struct S MY_TYPE;
1754 Later parts of the compiler might only know that `object' was of
1755 type `struct S' if it were not for code just below. With this
1756 code however, later parts of the compiler see something like:
1758 struct S' == struct S
1759 typedef struct S' MY_TYPE;
1762 And they can then deduce (from the node for type struct S') that
1763 the original object declaration was:
1767 Being able to do this is important for proper support of protoize,
1768 and also for generating precise symbolic debugging information
1769 which takes full account of the programmer's (typedef) vocabulary.
1771 Obviously, we don't want to generate a duplicate ..._TYPE node if
1772 the TYPE_DECL node that we are now processing really represents a
1773 standard built-in type.
1775 Since all standard types are effectively declared at line zero
1776 in the source file, we can easily check to see if we are working
1777 on a standard type by checking the current value of lineno. */
1779 if (TREE_CODE (x) == TYPE_DECL)
1781 if (DECL_SOURCE_LINE (x) == 0)
1783 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1784 TYPE_NAME (TREE_TYPE (x)) = x;
1786 else if (TREE_TYPE (x) != error_mark_node
1787 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1789 tree tt = TREE_TYPE (x);
1790 DECL_ORIGINAL_TYPE (x) = tt;
1791 tt = build_type_copy (tt);
1793 TREE_USED (tt) = TREE_USED (x);
1798 /* Multiple external decls of the same identifier ought to match.
1799 We get warnings about inline functions where they are defined.
1800 Avoid duplicate warnings where they are used. */
1802 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
1806 if (IDENTIFIER_LIMBO_VALUE (name) != 0)
1807 /* Decls in limbo are always extern, so no need to check that. */
1808 decl = IDENTIFIER_LIMBO_VALUE (name);
1812 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
1813 /* If old decl is built-in, we already warned if we should. */
1814 && !DECL_BUILT_IN (decl))
1816 pedwarn_with_decl (x,
1817 "type mismatch with previous external decl");
1818 pedwarn_with_decl (decl, "previous external decl of `%s'");
1822 /* If a function has had an implicit declaration, and then is defined,
1823 make sure they are compatible. */
1825 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1826 && IDENTIFIER_GLOBAL_VALUE (name) == 0
1827 && TREE_CODE (x) == FUNCTION_DECL
1828 && ! comptypes (TREE_TYPE (x),
1829 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
1831 warning_with_decl (x, "type mismatch with previous implicit declaration");
1832 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
1833 "previous implicit declaration of `%s'");
1836 /* This name is new in its binding level.
1837 Install the new declaration and return it. */
1838 if (b == global_binding_level)
1840 /* Install a global value. */
1842 /* If the first global decl has external linkage,
1843 warn if we later see static one. */
1844 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
1845 TREE_PUBLIC (name) = 1;
1847 IDENTIFIER_GLOBAL_VALUE (name) = x;
1849 /* We no longer care about any previous block level declarations. */
1850 IDENTIFIER_LIMBO_VALUE (name) = 0;
1852 /* Don't forget if the function was used via an implicit decl. */
1853 if (IDENTIFIER_IMPLICIT_DECL (name)
1854 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
1855 TREE_USED (x) = 1, TREE_USED (name) = 1;
1857 /* Don't forget if its address was taken in that way. */
1858 if (IDENTIFIER_IMPLICIT_DECL (name)
1859 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
1860 TREE_ADDRESSABLE (x) = 1;
1862 /* Warn about mismatches against previous implicit decl. */
1863 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1864 /* If this real decl matches the implicit, don't complain. */
1865 && ! (TREE_CODE (x) == FUNCTION_DECL
1866 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
1867 == integer_type_node)))
1868 pedwarn ("`%s' was previously implicitly declared to return `int'",
1869 IDENTIFIER_POINTER (name));
1871 /* If this decl is `static' and an `extern' was seen previously,
1872 that is erroneous. */
1873 if (TREE_PUBLIC (name)
1874 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
1876 /* Okay to redeclare an ANSI built-in as static. */
1877 if (t != 0 && DECL_BUILT_IN (t))
1879 /* Okay to declare a non-ANSI built-in as anything. */
1880 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
1882 /* Okay to have global type decl after an earlier extern
1883 declaration inside a lexical block. */
1884 else if (TREE_CODE (x) == TYPE_DECL)
1886 else if (IDENTIFIER_IMPLICIT_DECL (name))
1888 if (! TREE_THIS_VOLATILE (name))
1889 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1890 IDENTIFIER_POINTER (name));
1893 pedwarn ("`%s' was declared `extern' and later `static'",
1894 IDENTIFIER_POINTER (name));
1899 /* Here to install a non-global value. */
1900 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
1901 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
1903 IDENTIFIER_LOCAL_VALUE (name) = x;
1905 /* If this is an extern function declaration, see if we
1906 have a global definition or declaration for the function. */
1909 && TREE_CODE (x) == FUNCTION_DECL
1910 && TREE_CODE (oldglobal) == FUNCTION_DECL
1911 && DECL_EXTERNAL (x)
1912 && ! DECL_DECLARED_INLINE_P (x))
1914 /* We have one. Their types must agree. */
1915 if (! comptypes (TREE_TYPE (x),
1916 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
1917 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
1920 /* Inner extern decl is inline if global one is.
1921 Copy enough to really inline it. */
1922 if (DECL_DECLARED_INLINE_P (oldglobal))
1924 DECL_DECLARED_INLINE_P (x)
1925 = DECL_DECLARED_INLINE_P (oldglobal);
1926 DECL_INLINE (x) = DECL_INLINE (oldglobal);
1927 DECL_INITIAL (x) = (current_function_decl == oldglobal
1928 ? 0 : DECL_INITIAL (oldglobal));
1929 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
1930 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
1931 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
1932 DECL_RESULT (x) = DECL_RESULT (oldglobal);
1933 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
1934 DECL_ABSTRACT_ORIGIN (x)
1935 = DECL_ABSTRACT_ORIGIN (oldglobal);
1937 /* Inner extern decl is built-in if global one is. */
1938 if (DECL_BUILT_IN (oldglobal))
1940 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
1941 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
1943 /* Keep the arg types from a file-scope fcn defn. */
1944 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
1945 && DECL_INITIAL (oldglobal)
1946 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
1947 TREE_TYPE (x) = TREE_TYPE (oldglobal);
1952 /* This case is probably sometimes the right thing to do. */
1953 /* If we have a local external declaration,
1954 then any file-scope declaration should not
1955 have been static. */
1956 if (oldlocal == 0 && oldglobal != 0
1957 && !TREE_PUBLIC (oldglobal)
1958 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
1959 warning ("`%s' locally external but globally static",
1960 IDENTIFIER_POINTER (name));
1963 /* If we have a local external declaration,
1964 and no file-scope declaration has yet been seen,
1965 then if we later have a file-scope decl it must not be static. */
1967 && DECL_EXTERNAL (x)
1971 TREE_PUBLIC (name) = 1;
1973 /* Save this decl, so that we can do type checking against
1974 other decls after it falls out of scope.
1976 Only save it once. This prevents temporary decls created in
1977 expand_inline_function from being used here, since this
1978 will have been set when the inline function was parsed.
1979 It also helps give slightly better warnings. */
1980 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
1981 IDENTIFIER_LIMBO_VALUE (name) = x;
1984 warn_if_shadowing (x, oldlocal);
1986 /* If storing a local value, there may already be one (inherited).
1987 If so, record it for restoration when this binding level ends. */
1989 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
1992 /* Keep list of variables in this level with incomplete type.
1993 If the input is erroneous, we can have error_mark in the type
1994 slot (e.g. "f(void a, ...)") - that doesn't count as an
1996 if (TREE_TYPE (x) != error_mark_node
1997 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1999 tree element = TREE_TYPE (x);
2001 while (TREE_CODE (element) == ARRAY_TYPE)
2002 element = TREE_TYPE (element);
2003 if (TREE_CODE (element) == RECORD_TYPE
2004 || TREE_CODE (element) == UNION_TYPE)
2005 b->incomplete_list = tree_cons (NULL_TREE, x, b->incomplete_list);
2009 /* Put decls on list in reverse order.
2010 We will reverse them later if necessary. */
2011 TREE_CHAIN (x) = b->names;
2017 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2020 pushdecl_top_level (x)
2024 struct binding_level *b = current_binding_level;
2026 current_binding_level = global_binding_level;
2028 current_binding_level = b;
2032 /* Generate an implicit declaration for identifier FUNCTIONID
2033 as a function of type int (). Print a warning if appropriate. */
2036 implicitly_declare (functionid)
2040 int traditional_warning = 0;
2041 /* Only one "implicit declaration" warning per identifier. */
2042 int implicit_warning;
2044 /* We used to reuse an old implicit decl here,
2045 but this loses with inline functions because it can clobber
2046 the saved decl chains. */
2048 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2049 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2052 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2054 /* Warn of implicit decl following explicit local extern decl.
2055 This is probably a program designed for traditional C. */
2056 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2057 traditional_warning = 1;
2059 /* Warn once of an implicit declaration. */
2060 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2062 DECL_EXTERNAL (decl) = 1;
2063 TREE_PUBLIC (decl) = 1;
2065 /* Record that we have an implicit decl and this is it. */
2066 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2068 /* ANSI standard says implicit declarations are in the innermost block.
2069 So we record the decl in the standard fashion. */
2072 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2074 objc_check_decl (decl);
2076 rest_of_decl_compilation (decl, NULL, 0, 0);
2078 if (implicit_warning)
2079 implicit_decl_warning (functionid);
2080 else if (warn_traditional && traditional_warning)
2081 warning ("function `%s' was previously declared within a block",
2082 IDENTIFIER_POINTER (functionid));
2084 /* Write a record describing this implicit function declaration to the
2085 prototypes file (if requested). */
2087 gen_aux_info_record (decl, 0, 1, 0);
2089 /* Possibly apply some default attributes to this implicit declaration. */
2090 decl_attributes (&decl, NULL_TREE, 0);
2096 implicit_decl_warning (id)
2099 const char *name = IDENTIFIER_POINTER (id);
2100 if (mesg_implicit_function_declaration == 2)
2101 error ("implicit declaration of function `%s'", name);
2102 else if (mesg_implicit_function_declaration == 1)
2103 warning ("implicit declaration of function `%s'", name);
2106 /* Return zero if the declaration NEWDECL is valid
2107 when the declaration OLDDECL (assumed to be for the same name)
2108 has already been seen.
2109 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2110 and 3 if it is a conflicting declaration. */
2113 redeclaration_error_message (newdecl, olddecl)
2114 tree newdecl, olddecl;
2116 if (TREE_CODE (newdecl) == TYPE_DECL)
2118 /* Do not complain about type redeclarations where at least one
2119 declaration was in a system header. */
2120 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2124 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2126 /* Declarations of functions can insist on internal linkage
2127 but they can't be inconsistent with internal linkage,
2128 so there can be no error on that account.
2129 However defining the same name twice is no good. */
2130 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2131 /* However, defining once as extern inline and a second
2132 time in another way is ok. */
2133 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2134 && ! (DECL_DECLARED_INLINE_P (newdecl)
2135 && DECL_EXTERNAL (newdecl))))
2139 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2141 /* Objects declared at top level: */
2142 /* If at least one is a reference, it's ok. */
2143 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2145 /* Reject two definitions. */
2146 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2148 /* Now we have two tentative defs, or one tentative and one real def. */
2149 /* Insist that the linkage match. */
2150 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2154 else if (current_binding_level->parm_flag
2155 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2159 /* Newdecl has block scope. If olddecl has block scope also, then
2160 reject two definitions, and reject a definition together with an
2161 external reference. Otherwise, it is OK, because newdecl must
2162 be an extern reference to olddecl. */
2163 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2164 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2170 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2171 Create one if none exists so far for the current function.
2172 This function is called for both label definitions and label references. */
2178 tree decl = IDENTIFIER_LABEL_VALUE (id);
2180 if (current_function_decl == 0)
2182 error ("label %s referenced outside of any function",
2183 IDENTIFIER_POINTER (id));
2187 /* Use a label already defined or ref'd with this name. */
2190 /* But not if it is inherited and wasn't declared to be inheritable. */
2191 if (DECL_CONTEXT (decl) != current_function_decl
2192 && ! C_DECLARED_LABEL_FLAG (decl))
2193 return shadow_label (id);
2197 decl = build_decl (LABEL_DECL, id, void_type_node);
2199 /* A label not explicitly declared must be local to where it's ref'd. */
2200 DECL_CONTEXT (decl) = current_function_decl;
2202 DECL_MODE (decl) = VOIDmode;
2204 /* Say where one reference is to the label,
2205 for the sake of the error if it is not defined. */
2206 DECL_SOURCE_LINE (decl) = lineno;
2207 DECL_SOURCE_FILE (decl) = input_filename;
2209 IDENTIFIER_LABEL_VALUE (id) = decl;
2211 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2216 /* Make a label named NAME in the current function,
2217 shadowing silently any that may be inherited from containing functions
2218 or containing scopes.
2220 Note that valid use, if the label being shadowed
2221 comes from another scope in the same function,
2222 requires calling declare_nonlocal_label right away. */
2228 tree decl = IDENTIFIER_LABEL_VALUE (name);
2234 /* Check to make sure that the label hasn't already been declared
2235 at this label scope */
2236 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2237 if (TREE_VALUE (dup) == decl)
2239 error ("duplicate label declaration `%s'",
2240 IDENTIFIER_POINTER (name));
2241 error_with_decl (TREE_VALUE (dup),
2242 "this is a previous declaration");
2243 /* Just use the previous declaration. */
2244 return lookup_label (name);
2247 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2248 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2251 return lookup_label (name);
2254 /* Define a label, specifying the location in the source file.
2255 Return the LABEL_DECL node for the label, if the definition is valid.
2256 Otherwise return 0. */
2259 define_label (filename, line, name)
2260 const char *filename;
2264 tree decl = lookup_label (name);
2266 /* If label with this name is known from an outer context, shadow it. */
2267 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2269 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2270 IDENTIFIER_LABEL_VALUE (name) = 0;
2271 decl = lookup_label (name);
2274 if (warn_traditional && !in_system_header && lookup_name (name))
2275 warning_with_file_and_line (filename, line,
2276 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2277 IDENTIFIER_POINTER (name));
2279 if (DECL_INITIAL (decl) != 0)
2281 error_with_file_and_line (filename, line, "duplicate label `%s'",
2282 IDENTIFIER_POINTER (name));
2287 /* Mark label as having been defined. */
2288 DECL_INITIAL (decl) = error_mark_node;
2289 /* Say where in the source. */
2290 DECL_SOURCE_FILE (decl) = filename;
2291 DECL_SOURCE_LINE (decl) = line;
2296 /* Return the list of declarations of the current level.
2297 Note that this list is in reverse order unless/until
2298 you nreverse it; and when you do nreverse it, you must
2299 store the result back using `storedecls' or you will lose. */
2304 return current_binding_level->names;
2307 /* Return the list of type-tags (for structs, etc) of the current level. */
2312 return current_binding_level->tags;
2315 /* Store the list of declarations of the current level.
2316 This is done for the parameter declarations of a function being defined,
2317 after they are modified in the light of any missing parameters. */
2323 current_binding_level->names = decls;
2326 /* Similarly, store the list of tags of the current level. */
2332 current_binding_level->tags = tags;
2335 /* Given NAME, an IDENTIFIER_NODE,
2336 return the structure (or union or enum) definition for that name.
2337 Searches binding levels from BINDING_LEVEL up to the global level.
2338 If THISLEVEL_ONLY is nonzero, searches only the specified context
2339 (but skips any tag-transparent contexts to find one that is
2340 meaningful for tags).
2341 CODE says which kind of type the caller wants;
2342 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2343 If the wrong kind of type is found, an error is reported. */
2346 lookup_tag (code, name, binding_level, thislevel_only)
2347 enum tree_code code;
2348 struct binding_level *binding_level;
2352 struct binding_level *level;
2355 for (level = binding_level; level; level = level->level_chain)
2358 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2360 if (TREE_PURPOSE (tail) == name)
2362 if (TREE_CODE (TREE_VALUE (tail)) != code)
2364 /* Definition isn't the kind we were looking for. */
2365 pending_invalid_xref = name;
2366 pending_invalid_xref_file = input_filename;
2367 pending_invalid_xref_line = lineno;
2368 /* If in the same binding level as a declaration as a tag
2369 of a different type, this must not be allowed to
2370 shadow that tag, so give the error immediately.
2371 (For example, "struct foo; union foo;" is invalid.) */
2373 pending_xref_error ();
2375 return TREE_VALUE (tail);
2378 if (! level->tag_transparent)
2388 /* Print an error message now
2389 for a recent invalid struct, union or enum cross reference.
2390 We don't print them immediately because they are not invalid
2391 when used in the `struct foo;' construct for shadowing. */
2394 pending_xref_error ()
2396 if (pending_invalid_xref != 0)
2397 error_with_file_and_line (pending_invalid_xref_file,
2398 pending_invalid_xref_line,
2399 "`%s' defined as wrong kind of tag",
2400 IDENTIFIER_POINTER (pending_invalid_xref));
2401 pending_invalid_xref = 0;
2404 /* Given a type, find the tag that was defined for it and return the tag name.
2405 Otherwise return 0. */
2408 lookup_tag_reverse (type)
2411 struct binding_level *level;
2413 for (level = current_binding_level; level; level = level->level_chain)
2416 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2418 if (TREE_VALUE (tail) == type)
2419 return TREE_PURPOSE (tail);
2425 /* Look up NAME in the current binding level and its superiors
2426 in the namespace of variables, functions and typedefs.
2427 Return a ..._DECL node of some kind representing its definition,
2428 or return 0 if it is undefined. */
2436 if (current_binding_level != global_binding_level
2437 && IDENTIFIER_LOCAL_VALUE (name))
2438 val = IDENTIFIER_LOCAL_VALUE (name);
2440 val = IDENTIFIER_GLOBAL_VALUE (name);
2444 /* Similar to `lookup_name' but look only at current binding level. */
2447 lookup_name_current_level (name)
2452 if (current_binding_level == global_binding_level)
2453 return IDENTIFIER_GLOBAL_VALUE (name);
2455 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2458 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2459 if (DECL_NAME (t) == name)
2465 /* Create the predefined scalar types of C,
2466 and some nodes representing standard constants (0, 1, (void *) 0).
2467 Initialize the global binding level.
2468 Make definitions for built-in primitive functions. */
2471 c_init_decl_processing ()
2474 tree ptr_ftype_void, ptr_ftype_ptr;
2476 /* Adds some ggc roots, and reserved words for c-parse.in. */
2479 current_function_decl = NULL;
2480 named_labels = NULL;
2481 current_binding_level = NULL_BINDING_LEVEL;
2482 free_binding_level = NULL_BINDING_LEVEL;
2484 /* Make the binding_level structure for global names. */
2486 global_binding_level = current_binding_level;
2488 build_common_tree_nodes (flag_signed_char);
2490 c_common_nodes_and_builtins ();
2492 boolean_type_node = integer_type_node;
2493 boolean_true_node = integer_one_node;
2494 boolean_false_node = integer_zero_node;
2496 c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
2497 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2498 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2499 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2500 TYPE_PRECISION (c_bool_type_node) = 1;
2501 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2503 c_bool_false_node = build_int_2 (0, 0);
2504 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2505 c_bool_true_node = build_int_2 (1, 0);
2506 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2508 endlink = void_list_node;
2509 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2511 = build_function_type (ptr_type_node,
2512 tree_cons (NULL_TREE, ptr_type_node, endlink));
2514 pedantic_lvalues = pedantic;
2516 make_fname_decl = c_make_fname_decl;
2517 start_fname_decls ();
2520 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2521 decl, NAME is the initialization string and TYPE_DEP indicates whether
2522 NAME depended on the type of the function. As we don't yet implement
2523 delayed emission of static data, we mark the decl as emitted
2524 so it is not placed in the output. Anything using it must therefore pull
2525 out the STRING_CST initializer directly. This does mean that these names
2526 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2529 c_make_fname_decl (id, type_dep)
2533 const char *name = fname_as_string (type_dep);
2534 tree decl, type, init;
2535 size_t length = strlen (name);
2537 type = build_array_type
2538 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2539 build_index_type (size_int (length)));
2541 decl = build_decl (VAR_DECL, id, type);
2542 /* We don't push the decl, so have to set its context here. */
2543 DECL_CONTEXT (decl) = current_function_decl;
2545 TREE_STATIC (decl) = 1;
2546 TREE_READONLY (decl) = 1;
2547 DECL_ARTIFICIAL (decl) = 1;
2549 init = build_string (length + 1, name);
2550 TREE_TYPE (init) = type;
2551 DECL_INITIAL (decl) = init;
2553 TREE_USED (decl) = 1;
2555 if (current_function_decl)
2557 /* Add the decls to the outermost block. */
2558 struct binding_level *b = current_binding_level;
2559 struct binding_level *old = b;
2560 while (b->level_chain->parm_flag == 0)
2562 current_binding_level = b;
2564 current_binding_level = old;
2567 finish_decl (decl, init, NULL_TREE);
2572 /* Return a definition for a builtin function named NAME and whose data type
2573 is TYPE. TYPE should be a function type with argument types.
2574 FUNCTION_CODE tells later passes how to compile calls to this function.
2575 See tree.h for its possible values.
2577 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2578 the name to be called if we can't opencode the function. If
2579 ATTRS is nonzero, use that for the function's attribute list. */
2582 builtin_function (name, type, function_code, class, library_name, attrs)
2586 enum built_in_class class;
2587 const char *library_name;
2590 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2591 DECL_EXTERNAL (decl) = 1;
2592 TREE_PUBLIC (decl) = 1;
2594 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2595 make_decl_rtl (decl, NULL);
2597 DECL_BUILT_IN_CLASS (decl) = class;
2598 DECL_FUNCTION_CODE (decl) = function_code;
2600 /* Warn if a function in the namespace for users
2601 is used without an occasion to consider it declared. */
2602 if (name[0] != '_' || name[1] != '_')
2603 C_DECL_ANTICIPATED (decl) = 1;
2605 /* Possibly apply some default attributes to this built-in function. */
2607 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2609 decl_attributes (&decl, NULL_TREE, 0);
2614 /* Apply default attributes to a function, if a system function with default
2618 c_insert_default_attributes (decl)
2621 if (!TREE_PUBLIC (decl))
2623 c_common_insert_default_attributes (decl);
2626 /* Called when a declaration is seen that contains no names to declare.
2627 If its type is a reference to a structure, union or enum inherited
2628 from a containing scope, shadow that tag name for the current scope
2629 with a forward reference.
2630 If its type defines a new named structure or union
2631 or defines an enum, it is valid but we need not do anything here.
2632 Otherwise, it is an error. */
2635 shadow_tag (declspecs)
2638 shadow_tag_warned (declspecs, 0);
2642 shadow_tag_warned (declspecs, warned)
2645 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2652 pending_invalid_xref = 0;
2654 /* Remove the attributes from declspecs, since they will confuse the
2656 split_specs_attrs (declspecs, &specs, &attrs);
2658 for (link = specs; link; link = TREE_CHAIN (link))
2660 tree value = TREE_VALUE (link);
2661 enum tree_code code = TREE_CODE (value);
2663 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2664 /* Used to test also that TYPE_SIZE (value) != 0.
2665 That caused warning for `struct foo;' at top level in the file. */
2667 tree name = lookup_tag_reverse (value);
2674 if (warned != 1 && code != ENUMERAL_TYPE)
2675 /* Empty unnamed enum OK */
2677 pedwarn ("unnamed struct/union that defines no instances");
2683 t = lookup_tag (code, name, current_binding_level, 1);
2687 t = make_node (code);
2694 if (!warned && ! in_system_header)
2696 warning ("useless keyword or type name in empty declaration");
2703 error ("two types specified in one empty declaration");
2708 pedwarn ("empty declaration");
2712 /* Construct an array declarator. EXPR is the expression inside [], or
2713 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2714 to the pointer to which a parameter array is converted). STATIC_P is
2715 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2716 is nonzero is the array is [*], a VLA of unspecified length which is
2717 nevertheless a complete type (not currently implemented by GCC),
2718 zero otherwise. The declarator is constructed as an ARRAY_REF
2719 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2720 left of the [] (filled by in set_array_declarator_type) and operand 1
2721 is the expression inside; whose TREE_TYPE is the type qualifiers and
2722 which has TREE_STATIC set if "static" is used. */
2725 build_array_declarator (expr, quals, static_p, vla_unspec_p)
2732 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2733 TREE_TYPE (decl) = quals;
2734 TREE_STATIC (decl) = (static_p ? 1 : 0);
2735 if (pedantic && !flag_isoc99)
2737 if (static_p || quals != NULL_TREE)
2738 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2740 pedwarn ("ISO C90 does not support `[*]' array declarators");
2743 warning ("GCC does not yet properly implement `[*]' array declarators");
2747 /* Set the type of an array declarator. DECL is the declarator, as
2748 constructed by build_array_declarator; TYPE is what appears on the left
2749 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2750 abstract declarator, zero otherwise; this is used to reject static and
2751 type qualifiers in abstract declarators, where they are not in the
2755 set_array_declarator_type (decl, type, abstract_p)
2760 TREE_OPERAND (decl, 0) = type;
2761 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2762 error ("static or type qualifiers in abstract declarator");
2766 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2769 groktypename (typename)
2774 if (TREE_CODE (typename) != TREE_LIST)
2777 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2779 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
2781 /* Apply attributes. */
2782 decl_attributes (&typename, attrs, 0);
2787 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2790 groktypename_in_parm_context (typename)
2793 if (TREE_CODE (typename) != TREE_LIST)
2795 return grokdeclarator (TREE_VALUE (typename),
2796 TREE_PURPOSE (typename),
2800 /* Decode a declarator in an ordinary declaration or data definition.
2801 This is called as soon as the type information and variable name
2802 have been parsed, before parsing the initializer if any.
2803 Here we create the ..._DECL node, fill in its type,
2804 and put it on the list of decls for the current context.
2805 The ..._DECL node is returned as the value.
2807 Exception: for arrays where the length is not specified,
2808 the type is left null, to be filled in by `finish_decl'.
2810 Function definitions do not come here; they go to start_function
2811 instead. However, external and forward declarations of functions
2812 do go through here. Structure field declarations are done by
2813 grokfield and not through here. */
2816 start_decl (declarator, declspecs, initialized, attributes)
2817 tree declarator, declspecs;
2824 /* An object declared as __attribute__((deprecated)) suppresses
2825 warnings of uses of other deprecated items. */
2826 if (lookup_attribute ("deprecated", attributes))
2827 deprecated_state = DEPRECATED_SUPPRESS;
2829 decl = grokdeclarator (declarator, declspecs,
2830 NORMAL, initialized);
2832 deprecated_state = DEPRECATED_NORMAL;
2834 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2835 && MAIN_NAME_P (DECL_NAME (decl)))
2836 warning_with_decl (decl, "`%s' is usually a function");
2839 /* Is it valid for this decl to have an initializer at all?
2840 If not, set INITIALIZED to zero, which will indirectly
2841 tell `finish_decl' to ignore the initializer once it is parsed. */
2842 switch (TREE_CODE (decl))
2845 error ("typedef `%s' is initialized (use __typeof__ instead)",
2846 IDENTIFIER_POINTER (DECL_NAME (decl)));
2851 error ("function `%s' is initialized like a variable",
2852 IDENTIFIER_POINTER (DECL_NAME (decl)));
2857 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2858 error ("parameter `%s' is initialized",
2859 IDENTIFIER_POINTER (DECL_NAME (decl)));
2864 /* Don't allow initializations for incomplete types
2865 except for arrays which might be completed by the initialization. */
2867 /* This can happen if the array size is an undefined macro. We already
2868 gave a warning, so we don't need another one. */
2869 if (TREE_TYPE (decl) == error_mark_node)
2871 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2873 /* A complete type is ok if size is fixed. */
2875 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2876 || C_DECL_VARIABLE_SIZE (decl))
2878 error ("variable-sized object may not be initialized");
2882 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2884 error ("variable `%s' has initializer but incomplete type",
2885 IDENTIFIER_POINTER (DECL_NAME (decl)));
2888 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2890 error ("elements of array `%s' have incomplete type",
2891 IDENTIFIER_POINTER (DECL_NAME (decl)));
2899 /* Seems redundant with grokdeclarator. */
2900 if (current_binding_level != global_binding_level
2901 && DECL_EXTERNAL (decl)
2902 && TREE_CODE (decl) != FUNCTION_DECL)
2903 warning ("declaration of `%s' has `extern' and is initialized",
2904 IDENTIFIER_POINTER (DECL_NAME (decl)));
2906 DECL_EXTERNAL (decl) = 0;
2907 if (current_binding_level == global_binding_level)
2908 TREE_STATIC (decl) = 1;
2910 /* Tell `pushdecl' this is an initialized decl
2911 even though we don't yet have the initializer expression.
2912 Also tell `finish_decl' it may store the real initializer. */
2913 DECL_INITIAL (decl) = error_mark_node;
2916 /* If this is a function declaration, write a record describing it to the
2917 prototypes file (if requested). */
2919 if (TREE_CODE (decl) == FUNCTION_DECL)
2920 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2922 /* ANSI specifies that a tentative definition which is not merged with
2923 a non-tentative definition behaves exactly like a definition with an
2924 initializer equal to zero. (Section 3.7.2)
2926 -fno-common gives strict ANSI behavior, though this tends to break
2927 a large body of code that grew up without this rule.
2929 Thread-local variables are never common, since there's no entrenched
2930 body of code to break, and it allows more efficient variable references
2931 in the presence of dynamic linking. */
2933 if (TREE_CODE (decl) == VAR_DECL
2935 && TREE_PUBLIC (decl)
2936 && !DECL_THREAD_LOCAL (decl)
2938 DECL_COMMON (decl) = 1;
2940 /* Set attributes here so if duplicate decl, will have proper attributes. */
2941 decl_attributes (&decl, attributes, 0);
2943 /* If #pragma weak was used, mark the decl weak now. */
2944 if (current_binding_level == global_binding_level)
2945 maybe_apply_pragma_weak (decl);
2947 if (TREE_CODE (decl) == FUNCTION_DECL
2948 && DECL_DECLARED_INLINE_P (decl)
2949 && DECL_UNINLINABLE (decl)
2950 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2951 warning_with_decl (decl,
2952 "inline function `%s' given attribute noinline");
2954 /* Add this decl to the current binding level.
2955 TEM may equal DECL or it may be a previous decl of the same name. */
2956 tem = pushdecl (decl);
2958 /* For a local variable, define the RTL now. */
2959 if (current_binding_level != global_binding_level
2960 /* But not if this is a duplicate decl
2961 and we preserved the rtl from the previous one
2962 (which may or may not happen). */
2963 && !DECL_RTL_SET_P (tem)
2964 && !DECL_CONTEXT (tem))
2966 if (TREE_TYPE (tem) != error_mark_node
2967 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
2969 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2970 && DECL_INITIAL (tem) != 0)
2977 /* Finish processing of a declaration;
2978 install its initial value.
2979 If the length of an array type is not known before,
2980 it must be determined now, from the initial value, or it is an error. */
2983 finish_decl (decl, init, asmspec_tree)
2987 tree type = TREE_TYPE (decl);
2988 int was_incomplete = (DECL_SIZE (decl) == 0);
2989 const char *asmspec = 0;
2991 /* If a name was specified, get the string. */
2992 if (current_binding_level == global_binding_level)
2993 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2995 asmspec = TREE_STRING_POINTER (asmspec_tree);
2997 /* If `start_decl' didn't like having an initialization, ignore it now. */
2998 if (init != 0 && DECL_INITIAL (decl) == 0)
3001 /* Don't crash if parm is initialized. */
3002 if (TREE_CODE (decl) == PARM_DECL)
3006 store_init_value (decl, init);
3008 /* Deduce size of array from initialization, if not already known */
3009 if (TREE_CODE (type) == ARRAY_TYPE
3010 && TYPE_DOMAIN (type) == 0
3011 && TREE_CODE (decl) != TYPE_DECL)
3014 = (TREE_STATIC (decl)
3015 /* Even if pedantic, an external linkage array
3016 may have incomplete type at first. */
3017 ? pedantic && !TREE_PUBLIC (decl)
3018 : !DECL_EXTERNAL (decl));
3020 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3022 /* Get the completed type made by complete_array_type. */
3023 type = TREE_TYPE (decl);
3026 error_with_decl (decl, "initializer fails to determine size of `%s'");
3028 else if (failure == 2)
3031 error_with_decl (decl, "array size missing in `%s'");
3032 /* If a `static' var's size isn't known,
3033 make it extern as well as static, so it does not get
3035 If it is not `static', then do not mark extern;
3036 finish_incomplete_decl will give it a default size
3037 and it will get allocated. */
3038 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3039 DECL_EXTERNAL (decl) = 1;
3042 /* TYPE_MAX_VALUE is always one less than the number of elements
3043 in the array, because we start counting at zero. Therefore,
3044 warn only if the value is less than zero. */
3045 else if (pedantic && TYPE_DOMAIN (type) != 0
3046 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3047 error_with_decl (decl, "zero or negative size array `%s'");
3049 layout_decl (decl, 0);
3052 if (TREE_CODE (decl) == VAR_DECL)
3054 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3055 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3056 layout_decl (decl, 0);
3058 if (DECL_SIZE (decl) == 0
3059 /* Don't give an error if we already gave one earlier. */
3060 && TREE_TYPE (decl) != error_mark_node
3061 && (TREE_STATIC (decl)
3063 /* A static variable with an incomplete type
3064 is an error if it is initialized.
3065 Also if it is not file scope.
3066 Otherwise, let it through, but if it is not `extern'
3067 then it may cause an error message later. */
3068 (DECL_INITIAL (decl) != 0
3069 || DECL_CONTEXT (decl) != 0)
3071 /* An automatic variable with an incomplete type
3073 !DECL_EXTERNAL (decl)))
3075 error_with_decl (decl, "storage size of `%s' isn't known");
3076 TREE_TYPE (decl) = error_mark_node;
3079 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3080 && DECL_SIZE (decl) != 0)
3082 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3083 constant_expression_warning (DECL_SIZE (decl));
3085 error_with_decl (decl, "storage size of `%s' isn't constant");
3088 if (TREE_USED (type))
3089 TREE_USED (decl) = 1;
3092 /* If this is a function and an assembler name is specified, it isn't
3093 builtin any more. Also reset DECL_RTL so we can give it its new
3095 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3097 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3098 SET_DECL_RTL (decl, NULL_RTX);
3099 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3102 /* Output the assembler code and/or RTL code for variables and functions,
3103 unless the type is an undefined structure or union.
3104 If not, it will get done when the type is completed. */
3106 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3108 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3110 objc_check_decl (decl);
3112 if (!DECL_CONTEXT (decl))
3114 if (DECL_INITIAL (decl) == NULL_TREE
3115 || DECL_INITIAL (decl) == error_mark_node)
3116 /* Don't output anything
3117 when a tentative file-scope definition is seen.
3118 But at end of compilation, do output code for them. */
3119 DECL_DEFER_OUTPUT (decl) = 1;
3120 rest_of_decl_compilation (decl, asmspec,
3121 (DECL_CONTEXT (decl) == 0
3122 || TREE_ASM_WRITTEN (decl)), 0);
3126 /* This is a local variable. If there is an ASMSPEC, the
3127 user has requested that we handle it specially. */
3130 /* In conjunction with an ASMSPEC, the `register'
3131 keyword indicates that we should place the variable
3132 in a particular register. */
3133 if (DECL_REGISTER (decl))
3134 DECL_C_HARD_REGISTER (decl) = 1;
3136 /* If this is not a static variable, issue a warning.
3137 It doesn't make any sense to give an ASMSPEC for an
3138 ordinary, non-register local variable. Historically,
3139 GCC has accepted -- but ignored -- the ASMSPEC in
3141 if (TREE_CODE (decl) == VAR_DECL
3142 && !DECL_REGISTER (decl)
3143 && !TREE_STATIC (decl))
3144 warning_with_decl (decl,
3145 "ignoring asm-specifier for non-static local variable `%s'");
3147 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3150 if (TREE_CODE (decl) != FUNCTION_DECL)
3151 add_decl_stmt (decl);
3154 if (DECL_CONTEXT (decl) != 0)
3156 /* Recompute the RTL of a local array now
3157 if it used to be an incomplete type. */
3159 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3161 /* If we used it already as memory, it must stay in memory. */
3162 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3163 /* If it's still incomplete now, no init will save it. */
3164 if (DECL_SIZE (decl) == 0)
3165 DECL_INITIAL (decl) = 0;
3170 if (TREE_CODE (decl) == TYPE_DECL)
3172 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3174 objc_check_decl (decl);
3175 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3178 /* At the end of a declaration, throw away any variable type sizes
3179 of types defined inside that declaration. There is no use
3180 computing them in the following function definition. */
3181 if (current_binding_level == global_binding_level)
3182 get_pending_sizes ();
3185 /* Given a parsed parameter declaration,
3186 decode it into a PARM_DECL and push that on the current binding level.
3187 Also, for the sake of forward parm decls,
3188 record the given order of parms in `parm_order'. */
3191 push_parm_decl (parm)
3195 int old_immediate_size_expand = immediate_size_expand;
3196 /* Don't try computing parm sizes now -- wait till fn is called. */
3197 immediate_size_expand = 0;
3199 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3200 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3201 decl_attributes (&decl, TREE_VALUE (parm), 0);
3204 if (DECL_NAME (decl))
3207 olddecl = lookup_name (DECL_NAME (decl));
3208 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3209 pedwarn_with_decl (decl,
3210 "ISO C forbids parameter `%s' shadowing typedef");
3214 decl = pushdecl (decl);
3216 immediate_size_expand = old_immediate_size_expand;
3218 current_binding_level->parm_order
3219 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3221 /* Add this decl to the current binding level. */
3222 finish_decl (decl, NULL_TREE, NULL_TREE);
3225 /* Clear the given order of parms in `parm_order'.
3226 Used at start of parm list,
3227 and also at semicolon terminating forward decls. */
3232 current_binding_level->parm_order = NULL_TREE;
3235 static GTY(()) int compound_literal_number;
3237 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3238 literal, which may be an incomplete array type completed by the
3239 initializer; INIT is a CONSTRUCTOR that initializes the compound
3243 build_compound_literal (type, init)
3247 /* We do not use start_decl here because we have a type, not a declarator;
3248 and do not use finish_decl because the decl should be stored inside
3249 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3250 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3253 DECL_EXTERNAL (decl) = 0;
3254 TREE_PUBLIC (decl) = 0;
3255 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3256 DECL_CONTEXT (decl) = current_function_decl;
3257 TREE_USED (decl) = 1;
3258 TREE_TYPE (decl) = type;
3259 TREE_READONLY (decl) = TREE_READONLY (type);
3260 store_init_value (decl, init);
3262 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3264 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3269 type = TREE_TYPE (decl);
3270 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3271 return error_mark_node;
3273 stmt = build_stmt (DECL_STMT, decl);
3274 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3275 TREE_SIDE_EFFECTS (complit) = 1;
3277 layout_decl (decl, 0);
3279 if (TREE_STATIC (decl))
3281 /* This decl needs a name for the assembler output. We also need
3282 a unique suffix to be added to the name. */
3285 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3286 compound_literal_number);
3287 compound_literal_number++;
3288 DECL_NAME (decl) = get_identifier (name);
3289 DECL_DEFER_OUTPUT (decl) = 1;
3290 DECL_COMDAT (decl) = 1;
3291 DECL_ARTIFICIAL (decl) = 1;
3293 rest_of_decl_compilation (decl, NULL, 1, 0);
3299 /* Make TYPE a complete type based on INITIAL_VALUE.
3300 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3301 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3304 complete_array_type (type, initial_value, do_default)
3309 tree maxindex = NULL_TREE;
3314 /* Note MAXINDEX is really the maximum index,
3315 one less than the size. */
3316 if (TREE_CODE (initial_value) == STRING_CST)
3319 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3320 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3323 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3325 tree elts = CONSTRUCTOR_ELTS (initial_value);
3326 maxindex = build_int_2 (-1, -1);
3327 for (; elts; elts = TREE_CHAIN (elts))
3329 if (TREE_PURPOSE (elts))
3330 maxindex = TREE_PURPOSE (elts);
3332 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3333 maxindex, integer_one_node));
3335 maxindex = copy_node (maxindex);
3339 /* Make an error message unless that happened already. */
3340 if (initial_value != error_mark_node)
3343 /* Prevent further error messages. */
3344 maxindex = build_int_2 (0, 0);
3351 maxindex = build_int_2 (0, 0);
3357 TYPE_DOMAIN (type) = build_index_type (maxindex);
3358 if (!TREE_TYPE (maxindex))
3359 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3362 /* Lay out the type now that we can get the real answer. */
3369 /* Determine whether TYPE is a structure with a flexible array member,
3370 or a union containing such a structure (possibly recursively). */
3373 flexible_array_type_p (type)
3377 switch (TREE_CODE (type))
3380 x = TYPE_FIELDS (type);
3383 while (TREE_CHAIN (x) != NULL_TREE)
3385 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3386 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3387 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3388 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3392 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3394 if (flexible_array_type_p (TREE_TYPE (x)))
3403 /* Given declspecs and a declarator,
3404 determine the name and type of the object declared
3405 and construct a ..._DECL node for it.
3406 (In one case we can return a ..._TYPE node instead.
3407 For invalid input we sometimes return 0.)
3409 DECLSPECS is a chain of tree_list nodes whose value fields
3410 are the storage classes and type specifiers.
3412 DECL_CONTEXT says which syntactic context this declaration is in:
3413 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3414 FUNCDEF for a function definition. Like NORMAL but a few different
3415 error messages in each case. Return value may be zero meaning
3416 this definition is too screwy to try to parse.
3417 PARM for a parameter declaration (either within a function prototype
3418 or before a function body). Make a PARM_DECL, or return void_type_node.
3419 TYPENAME if for a typename (in a cast or sizeof).
3420 Don't make a DECL node; just return the ..._TYPE node.
3421 FIELD for a struct or union field; make a FIELD_DECL.
3422 BITFIELD for a field with specified width.
3423 INITIALIZED is 1 if the decl has an initializer.
3425 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3426 It may also be so in the PARM case, for a prototype where the
3427 argument type is specified but not the name.
3429 This function is where the complicated C meanings of `static'
3430 and `extern' are interpreted. */
3433 grokdeclarator (declarator, declspecs, decl_context, initialized)
3436 enum decl_context decl_context;
3441 tree type = NULL_TREE;
3446 int type_quals = TYPE_UNQUALIFIED;
3448 int explicit_int = 0;
3449 int explicit_char = 0;
3450 int defaulted_int = 0;
3451 tree typedef_decl = 0;
3453 tree typedef_type = 0;
3454 int funcdef_flag = 0;
3455 enum tree_code innermost_code = ERROR_MARK;
3457 int size_varies = 0;
3458 tree decl_attr = NULL_TREE;
3459 tree array_ptr_quals = NULL_TREE;
3460 int array_parm_static = 0;
3461 tree returned_attrs = NULL_TREE;
3463 if (decl_context == BITFIELD)
3464 bitfield = 1, decl_context = FIELD;
3466 if (decl_context == FUNCDEF)
3467 funcdef_flag = 1, decl_context = NORMAL;
3469 /* Look inside a declarator for the name being declared
3470 and get it as a string, for an error message. */
3472 tree decl = declarator;
3476 switch (TREE_CODE (decl))
3481 innermost_code = TREE_CODE (decl);
3482 decl = TREE_OPERAND (decl, 0);
3486 decl = TREE_VALUE (decl);
3489 case IDENTIFIER_NODE:
3490 name = IDENTIFIER_POINTER (decl);
3501 /* A function definition's declarator must have the form of
3502 a function declarator. */
3504 if (funcdef_flag && innermost_code != CALL_EXPR)
3507 /* Anything declared one level down from the top level
3508 must be one of the parameters of a function
3509 (because the body is at least two levels down). */
3511 /* If this looks like a function definition, make it one,
3512 even if it occurs where parms are expected.
3513 Then store_parm_decls will reject it and not use it as a parm. */
3514 if (decl_context == NORMAL && !funcdef_flag
3515 && current_binding_level->parm_flag)
3516 decl_context = PARM;
3518 /* Look through the decl specs and record which ones appear.
3519 Some typespecs are defined as built-in typenames.
3520 Others, the ones that are modifiers of other types,
3521 are represented by bits in SPECBITS: set the bits for
3522 the modifiers that appear. Storage class keywords are also in SPECBITS.
3524 If there is a typedef name or a type, store the type in TYPE.
3525 This includes builtin typedefs such as `int'.
3527 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3528 and did not come from a user typedef.
3530 Set LONGLONG if `long' is mentioned twice. */
3532 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3534 tree id = TREE_VALUE (spec);
3536 /* If the entire declaration is itself tagged as deprecated then
3537 suppress reports of deprecated items. */
3538 if (id && TREE_DEPRECATED (id))
3540 if (deprecated_state != DEPRECATED_SUPPRESS)
3541 warn_deprecated_use (id);
3544 if (id == ridpointers[(int) RID_INT])
3546 if (id == ridpointers[(int) RID_CHAR])
3549 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3551 enum rid i = C_RID_CODE (id);
3552 if ((int) i <= (int) RID_LAST_MODIFIER)
3554 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3557 error ("`long long long' is too long for GCC");
3560 if (pedantic && !flag_isoc99 && ! in_system_header
3562 pedwarn ("ISO C90 does not support `long long'");
3566 else if (specbits & (1 << (int) i))
3568 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3571 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3574 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3577 /* Diagnose "__thread extern". Recall that this list
3578 is in the reverse order seen in the text. */
3580 && (specbits & (1 << (int) RID_EXTERN
3581 | 1 << (int) RID_STATIC)))
3583 if (specbits & 1 << (int) RID_EXTERN)
3584 error ("`__thread' before `extern'");
3586 error ("`__thread' before `static'");
3589 specbits |= 1 << (int) i;
3594 error ("two or more data types in declaration of `%s'", name);
3595 /* Actual typedefs come to us as TYPE_DECL nodes. */
3596 else if (TREE_CODE (id) == TYPE_DECL)
3598 if (TREE_TYPE (id) == error_mark_node)
3599 ; /* Allow the type to default to int to avoid cascading errors. */
3602 type = TREE_TYPE (id);
3603 decl_attr = DECL_ATTRIBUTES (id);
3607 /* Built-in types come as identifiers. */
3608 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3610 tree t = lookup_name (id);
3611 if (TREE_TYPE (t) == error_mark_node)
3613 else if (!t || TREE_CODE (t) != TYPE_DECL)
3614 error ("`%s' fails to be a typedef or built in type",
3615 IDENTIFIER_POINTER (id));
3618 type = TREE_TYPE (t);
3622 else if (TREE_CODE (id) != ERROR_MARK)
3629 typedef_type = type;
3631 size_varies = C_TYPE_VARIABLE_SIZE (type);
3633 /* No type at all: default to `int', and set DEFAULTED_INT
3634 because it was not a user-defined typedef. */
3638 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3639 | (1 << (int) RID_SIGNED)
3640 | (1 << (int) RID_UNSIGNED)
3641 | (1 << (int) RID_COMPLEX))))
3642 /* Don't warn about typedef foo = bar. */
3643 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3644 && ! in_system_header)
3646 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3647 and this is a function, or if -Wimplicit; prefer the former
3648 warning since it is more explicit. */
3649 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3651 warn_about_return_type = 1;
3652 else if (warn_implicit_int || flag_isoc99)
3653 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3658 type = integer_type_node;
3661 /* Now process the modifiers that were specified
3662 and check for invalid combinations. */
3664 /* Long double is a special combination. */
3666 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3667 && TYPE_MAIN_VARIANT (type) == double_type_node)
3669 specbits &= ~(1 << (int) RID_LONG);
3670 type = long_double_type_node;
3673 /* Check all other uses of type modifiers. */
3675 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3676 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3680 if ((specbits & 1 << (int) RID_LONG)
3681 && (specbits & 1 << (int) RID_SHORT))
3682 error ("both long and short specified for `%s'", name);
3683 else if (((specbits & 1 << (int) RID_LONG)
3684 || (specbits & 1 << (int) RID_SHORT))
3686 error ("long or short specified with char for `%s'", name);
3687 else if (((specbits & 1 << (int) RID_LONG)
3688 || (specbits & 1 << (int) RID_SHORT))
3689 && TREE_CODE (type) == REAL_TYPE)
3691 static int already = 0;
3693 error ("long or short specified with floating type for `%s'", name);
3694 if (! already && ! pedantic)
3696 error ("the only valid combination is `long double'");
3700 else if ((specbits & 1 << (int) RID_SIGNED)
3701 && (specbits & 1 << (int) RID_UNSIGNED))
3702 error ("both signed and unsigned specified for `%s'", name);
3703 else if (TREE_CODE (type) != INTEGER_TYPE)
3704 error ("long, short, signed or unsigned invalid for `%s'", name);
3708 if (!explicit_int && !defaulted_int && !explicit_char)
3710 error ("long, short, signed or unsigned used invalidly for `%s'",
3716 /* Discard the type modifiers if they are invalid. */
3719 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3720 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3725 if ((specbits & (1 << (int) RID_COMPLEX))
3726 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3728 error ("complex invalid for `%s'", name);
3729 specbits &= ~(1 << (int) RID_COMPLEX);
3732 /* Decide whether an integer type is signed or not.
3733 Optionally treat bitfields as signed by default. */
3734 if (specbits & 1 << (int) RID_UNSIGNED
3735 || (bitfield && ! flag_signed_bitfields
3736 && (explicit_int || defaulted_int || explicit_char
3737 /* A typedef for plain `int' without `signed'
3738 can be controlled just like plain `int'. */
3739 || ! (typedef_decl != 0
3740 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3741 && TREE_CODE (type) != ENUMERAL_TYPE
3742 && !(specbits & 1 << (int) RID_SIGNED)))
3745 type = long_long_unsigned_type_node;
3746 else if (specbits & 1 << (int) RID_LONG)
3747 type = long_unsigned_type_node;
3748 else if (specbits & 1 << (int) RID_SHORT)
3749 type = short_unsigned_type_node;
3750 else if (type == char_type_node)
3751 type = unsigned_char_type_node;
3752 else if (typedef_decl)
3753 type = c_common_unsigned_type (type);
3755 type = unsigned_type_node;
3757 else if ((specbits & 1 << (int) RID_SIGNED)
3758 && type == char_type_node)
3759 type = signed_char_type_node;
3761 type = long_long_integer_type_node;
3762 else if (specbits & 1 << (int) RID_LONG)
3763 type = long_integer_type_node;
3764 else if (specbits & 1 << (int) RID_SHORT)
3765 type = short_integer_type_node;
3767 if (specbits & 1 << (int) RID_COMPLEX)
3769 if (pedantic && !flag_isoc99)
3770 pedwarn ("ISO C90 does not support complex types");
3771 /* If we just have "complex", it is equivalent to
3772 "complex double", but if any modifiers at all are specified it is
3773 the complex form of TYPE. E.g, "complex short" is
3774 "complex short int". */
3776 if (defaulted_int && ! longlong
3777 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3778 | (1 << (int) RID_SIGNED)
3779 | (1 << (int) RID_UNSIGNED))))
3782 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3783 type = complex_double_type_node;
3785 else if (type == integer_type_node)
3788 pedwarn ("ISO C does not support complex integer types");
3789 type = complex_integer_type_node;
3791 else if (type == float_type_node)
3792 type = complex_float_type_node;
3793 else if (type == double_type_node)
3794 type = complex_double_type_node;
3795 else if (type == long_double_type_node)
3796 type = complex_long_double_type_node;
3800 pedwarn ("ISO C does not support complex integer types");
3801 type = build_complex_type (type);
3805 /* Figure out the type qualifiers for the declaration. There are
3806 two ways a declaration can become qualified. One is something
3807 like `const int i' where the `const' is explicit. Another is
3808 something like `typedef const int CI; CI i' where the type of the
3809 declaration contains the `const'. */
3810 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3811 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
3812 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3813 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3814 if (constp > 1 && ! flag_isoc99)
3815 pedwarn ("duplicate `const'");
3816 if (restrictp > 1 && ! flag_isoc99)
3817 pedwarn ("duplicate `restrict'");
3818 if (volatilep > 1 && ! flag_isoc99)
3819 pedwarn ("duplicate `volatile'");
3820 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3821 type = TYPE_MAIN_VARIANT (type);
3822 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3823 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3824 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3826 /* Warn if two storage classes are given. Default to `auto'. */
3831 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3832 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3833 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3834 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3835 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3837 /* "static __thread" and "extern __thread" are allowed. */
3838 if ((specbits & (1 << (int) RID_THREAD
3839 | 1 << (int) RID_STATIC
3840 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3843 /* Warn about storage classes that are invalid for certain
3844 kinds of declarations (parameters, typenames, etc.). */
3847 error ("multiple storage classes in declaration of `%s'", name);
3848 else if (funcdef_flag
3850 & ((1 << (int) RID_REGISTER)
3851 | (1 << (int) RID_AUTO)
3852 | (1 << (int) RID_TYPEDEF)
3853 | (1 << (int) RID_THREAD))))
3855 if (specbits & 1 << (int) RID_AUTO
3856 && (pedantic || current_binding_level == global_binding_level))
3857 pedwarn ("function definition declared `auto'");
3858 if (specbits & 1 << (int) RID_REGISTER)
3859 error ("function definition declared `register'");
3860 if (specbits & 1 << (int) RID_TYPEDEF)
3861 error ("function definition declared `typedef'");
3862 if (specbits & 1 << (int) RID_THREAD)
3863 error ("function definition declared `__thread'");
3864 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3865 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3867 else if (decl_context != NORMAL && nclasses > 0)
3869 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3873 switch (decl_context)
3876 error ("storage class specified for structure field `%s'",
3880 error ("storage class specified for parameter `%s'", name);
3883 error ("storage class specified for typename");
3886 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3887 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3888 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3891 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3893 /* `extern' with initialization is invalid if not at top level. */
3894 if (current_binding_level == global_binding_level)
3895 warning ("`%s' initialized and declared `extern'", name);
3897 error ("`%s' has both `extern' and initializer", name);
3899 else if (current_binding_level == global_binding_level)
3901 if (specbits & 1 << (int) RID_AUTO)
3902 error ("top-level declaration of `%s' specifies `auto'", name);
3906 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3907 error ("nested function `%s' declared `extern'", name);
3908 else if ((specbits & (1 << (int) RID_THREAD
3909 | 1 << (int) RID_EXTERN
3910 | 1 << (int) RID_STATIC))
3911 == (1 << (int) RID_THREAD))
3913 error ("function-scope `%s' implicitly auto and declared `__thread'",
3915 specbits &= ~(1 << (int) RID_THREAD);
3920 /* Now figure out the structure of the declarator proper.
3921 Descend through it, creating more complex types, until we reach
3922 the declared identifier (or NULL_TREE, in an absolute declarator). */
3924 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3926 if (type == error_mark_node)
3928 declarator = TREE_OPERAND (declarator, 0);
3932 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3933 an INDIRECT_REF (for *...),
3934 a CALL_EXPR (for ...(...)),
3935 a TREE_LIST (for nested attributes),
3936 an identifier (for the name being declared)
3937 or a null pointer (for the place in an absolute declarator
3938 where the name was omitted).
3939 For the last two cases, we have just exited the loop.
3941 At this point, TYPE is the type of elements of an array,
3942 or for a function to return, or for a pointer to point to.
3943 After this sequence of ifs, TYPE is the type of the
3944 array or function or pointer, and DECLARATOR has had its
3945 outermost layer removed. */
3947 if (array_ptr_quals != NULL_TREE || array_parm_static)
3949 /* Only the innermost declarator (making a parameter be of
3950 array type which is converted to pointer type)
3951 may have static or type qualifiers. */
3952 error ("static or type qualifiers in non-parameter array declarator");
3953 array_ptr_quals = NULL_TREE;
3954 array_parm_static = 0;
3957 if (TREE_CODE (declarator) == TREE_LIST)
3959 /* We encode a declarator with embedded attributes using
3961 tree attrs = TREE_PURPOSE (declarator);
3964 declarator = TREE_VALUE (declarator);
3965 inner_decl = declarator;
3966 while (inner_decl != NULL_TREE
3967 && TREE_CODE (inner_decl) == TREE_LIST)
3968 inner_decl = TREE_VALUE (inner_decl);
3969 if (inner_decl == NULL_TREE
3970 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3971 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3972 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3973 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3974 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3975 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3976 returned_attrs = decl_attributes (&type,
3977 chainon (returned_attrs, attrs),
3980 else if (TREE_CODE (declarator) == ARRAY_REF)
3982 tree itype = NULL_TREE;
3983 tree size = TREE_OPERAND (declarator, 1);
3984 /* The index is a signed object `sizetype' bits wide. */
3985 tree index_type = c_common_signed_type (sizetype);
3987 array_ptr_quals = TREE_TYPE (declarator);
3988 array_parm_static = TREE_STATIC (declarator);
3990 declarator = TREE_OPERAND (declarator, 0);
3992 /* Check for some types that there cannot be arrays of. */
3994 if (VOID_TYPE_P (type))
3996 error ("declaration of `%s' as array of voids", name);
3997 type = error_mark_node;
4000 if (TREE_CODE (type) == FUNCTION_TYPE)
4002 error ("declaration of `%s' as array of functions", name);
4003 type = error_mark_node;
4006 if (pedantic && flexible_array_type_p (type))
4007 pedwarn ("invalid use of structure with flexible array member");
4009 if (size == error_mark_node)
4010 type = error_mark_node;
4012 if (type == error_mark_node)
4015 /* If size was specified, set ITYPE to a range-type for that size.
4016 Otherwise, ITYPE remains null. finish_decl may figure it out
4017 from an initial value. */
4021 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4022 STRIP_TYPE_NOPS (size);
4024 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4026 error ("size of array `%s' has non-integer type", name);
4027 size = integer_one_node;
4030 if (pedantic && integer_zerop (size))
4031 pedwarn ("ISO C forbids zero-size array `%s'", name);
4033 if (TREE_CODE (size) == INTEGER_CST)
4035 constant_expression_warning (size);
4036 if (tree_int_cst_sgn (size) < 0)
4038 error ("size of array `%s' is negative", name);
4039 size = integer_one_node;
4044 /* Make sure the array size remains visibly nonconstant
4045 even if it is (eg) a const variable with known value. */
4048 if (!flag_isoc99 && pedantic)
4050 if (TREE_CONSTANT (size))
4051 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
4054 pedwarn ("ISO C90 forbids variable-size array `%s'",
4059 if (integer_zerop (size))
4061 /* A zero-length array cannot be represented with an
4062 unsigned index type, which is what we'll get with
4063 build_index_type. Create an open-ended range instead. */
4064 itype = build_range_type (sizetype, size, NULL_TREE);
4068 /* Compute the maximum valid index, that is, size - 1.
4069 Do the calculation in index_type, so that if it is
4070 a variable the computations will be done in the
4072 itype = fold (build (MINUS_EXPR, index_type,
4073 convert (index_type, size),
4074 convert (index_type, size_one_node)));
4076 /* If that overflowed, the array is too big.
4077 ??? While a size of INT_MAX+1 technically shouldn't
4078 cause an overflow (because we subtract 1), the overflow
4079 is recorded during the conversion to index_type, before
4080 the subtraction. Handling this case seems like an
4081 unnecessary complication. */
4082 if (TREE_OVERFLOW (itype))
4084 error ("size of array `%s' is too large", name);
4085 type = error_mark_node;
4090 itype = variable_size (itype);
4091 itype = build_index_type (itype);
4094 else if (decl_context == FIELD)
4096 if (pedantic && !flag_isoc99 && !in_system_header)
4097 pedwarn ("ISO C90 does not support flexible array members");
4099 /* ISO C99 Flexible array members are effectively identical
4100 to GCC's zero-length array extension. */
4101 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4104 /* If pedantic, complain about arrays of incomplete types. */
4106 if (pedantic && !COMPLETE_TYPE_P (type))
4107 pedwarn ("array type has incomplete element type");
4110 /* We shouldn't have a function type here at all!
4111 Functions aren't allowed as array elements. */
4112 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4113 && (constp || volatilep))
4114 pedwarn ("ISO C forbids const or volatile function types");
4117 /* Build the array type itself, then merge any constancy or
4118 volatility into the target type. We must do it in this order
4119 to ensure that the TYPE_MAIN_VARIANT field of the array type
4120 is set correctly. */
4122 type = build_array_type (type, itype);
4124 type = c_build_qualified_type (type, type_quals);
4127 C_TYPE_VARIABLE_SIZE (type) = 1;
4129 /* The GCC extension for zero-length arrays differs from
4130 ISO flexible array members in that sizeof yields zero. */
4131 if (size && integer_zerop (size))
4134 TYPE_SIZE (type) = bitsize_zero_node;
4135 TYPE_SIZE_UNIT (type) = size_zero_node;
4137 if (decl_context != PARM
4138 && (array_ptr_quals != NULL_TREE || array_parm_static))
4140 error ("static or type qualifiers in non-parameter array declarator");
4141 array_ptr_quals = NULL_TREE;
4142 array_parm_static = 0;
4145 else if (TREE_CODE (declarator) == CALL_EXPR)
4149 /* Declaring a function type.
4150 Make sure we have a valid type for the function to return. */
4151 if (type == error_mark_node)
4156 /* Warn about some types functions can't return. */
4158 if (TREE_CODE (type) == FUNCTION_TYPE)
4160 error ("`%s' declared as function returning a function", name);
4161 type = integer_type_node;
4163 if (TREE_CODE (type) == ARRAY_TYPE)
4165 error ("`%s' declared as function returning an array", name);
4166 type = integer_type_node;
4169 /* Construct the function type and go to the next
4170 inner layer of declarator. */
4172 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4174 /* Say it's a definition
4175 only for the CALL_EXPR
4176 closest to the identifier. */
4177 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4178 /* Type qualifiers before the return type of the function
4179 qualify the return type, not the function type. */
4182 /* Type qualifiers on a function return type are normally
4183 permitted by the standard but have no effect, so give a
4184 warning at -Wextra. Qualifiers on a void return type have
4185 meaning as a GNU extension, and are banned on function
4186 definitions in ISO C. FIXME: strictly we shouldn't
4187 pedwarn for qualified void return types except on function
4188 definitions, but not doing so could lead to the undesirable
4189 state of a "volatile void" function return type not being
4190 warned about, and a use of the function being compiled
4191 with GNU semantics, with no diagnostics under -pedantic. */
4192 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4193 pedwarn ("ISO C forbids qualified void function return type");
4194 else if (extra_warnings
4195 && !(VOID_TYPE_P (type)
4196 && type_quals == TYPE_QUAL_VOLATILE))
4197 warning ("type qualifiers ignored on function return type");
4199 type = c_build_qualified_type (type, type_quals);
4201 type_quals = TYPE_UNQUALIFIED;
4203 type = build_function_type (type, arg_types);
4204 declarator = TREE_OPERAND (declarator, 0);
4206 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4207 the formal parameter list of this FUNCTION_TYPE to point to
4208 the FUNCTION_TYPE node itself. */
4213 for (link = last_function_parm_tags;
4215 link = TREE_CHAIN (link))
4216 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4219 else if (TREE_CODE (declarator) == INDIRECT_REF)
4221 /* Merge any constancy or volatility into the target type
4224 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4226 pedwarn ("ISO C forbids qualified function types");
4228 type = c_build_qualified_type (type, type_quals);
4229 type_quals = TYPE_UNQUALIFIED;
4232 type = build_pointer_type (type);
4234 /* Process a list of type modifier keywords
4235 (such as const or volatile) that were given inside the `*'. */
4237 if (TREE_TYPE (declarator))
4245 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4246 typemodlist = TREE_CHAIN (typemodlist))
4248 tree qualifier = TREE_VALUE (typemodlist);
4250 if (C_IS_RESERVED_WORD (qualifier))
4252 if (C_RID_CODE (qualifier) == RID_CONST)
4254 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4256 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4266 error ("invalid type modifier within pointer declarator");
4267 if (constp > 1 && ! flag_isoc99)
4268 pedwarn ("duplicate `const'");
4269 if (volatilep > 1 && ! flag_isoc99)
4270 pedwarn ("duplicate `volatile'");
4271 if (restrictp > 1 && ! flag_isoc99)
4272 pedwarn ("duplicate `restrict'");
4274 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4275 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4276 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4279 declarator = TREE_OPERAND (declarator, 0);
4286 /* Now TYPE has the actual type. */
4288 /* Did array size calculations overflow? */
4290 if (TREE_CODE (type) == ARRAY_TYPE
4291 && COMPLETE_TYPE_P (type)
4292 && TREE_OVERFLOW (TYPE_SIZE (type)))
4294 error ("size of array `%s' is too large", name);
4295 /* If we proceed with the array type as it is, we'll eventually
4296 crash in tree_low_cst(). */
4297 type = error_mark_node;
4300 /* If this is declaring a typedef name, return a TYPE_DECL. */
4302 if (specbits & (1 << (int) RID_TYPEDEF))
4305 /* Note that the grammar rejects storage classes
4306 in typenames, fields or parameters */
4307 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4309 pedwarn ("ISO C forbids qualified function types");
4311 type = c_build_qualified_type (type, type_quals);
4312 decl = build_decl (TYPE_DECL, declarator, type);
4313 if ((specbits & (1 << (int) RID_SIGNED))
4314 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4315 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4316 decl_attributes (&decl, returned_attrs, 0);
4320 /* Detect the case of an array type of unspecified size
4321 which came, as such, direct from a typedef name.
4322 We must copy the type, so that each identifier gets
4323 a distinct type, so that each identifier's size can be
4324 controlled separately by its own initializer. */
4326 if (type != 0 && typedef_type != 0
4327 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4328 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4330 type = build_array_type (TREE_TYPE (type), 0);
4332 C_TYPE_VARIABLE_SIZE (type) = 1;
4335 /* If this is a type name (such as, in a cast or sizeof),
4336 compute the type and return it now. */
4338 if (decl_context == TYPENAME)
4340 /* Note that the grammar rejects storage classes
4341 in typenames, fields or parameters */
4342 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4344 pedwarn ("ISO C forbids const or volatile function types");
4346 type = c_build_qualified_type (type, type_quals);
4347 decl_attributes (&type, returned_attrs, 0);
4351 /* Aside from typedefs and type names (handle above),
4352 `void' at top level (not within pointer)
4353 is allowed only in public variables.
4354 We don't complain about parms either, but that is because
4355 a better error message can be made later. */
4357 if (VOID_TYPE_P (type) && decl_context != PARM
4358 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4359 && ((specbits & (1 << (int) RID_EXTERN))
4360 || (current_binding_level == global_binding_level
4362 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4364 error ("variable or field `%s' declared void", name);
4365 type = integer_type_node;
4368 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4369 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4374 if (decl_context == PARM)
4376 tree type_as_written;
4379 /* A parameter declared as an array of T is really a pointer to T.
4380 One declared as a function is really a pointer to a function. */
4382 if (TREE_CODE (type) == ARRAY_TYPE)
4384 /* Transfer const-ness of array into that of type pointed to. */
4385 type = TREE_TYPE (type);
4387 type = c_build_qualified_type (type, type_quals);
4388 type = build_pointer_type (type);
4389 type_quals = TYPE_UNQUALIFIED;
4390 if (array_ptr_quals)
4392 tree new_ptr_quals, new_ptr_attrs;
4394 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4395 /* We don't yet implement attributes in this context. */
4396 if (new_ptr_attrs != NULL_TREE)
4397 warning ("attributes in parameter array declarator ignored");
4402 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4404 tree qualifier = TREE_VALUE (new_ptr_quals);
4406 if (C_IS_RESERVED_WORD (qualifier))
4408 if (C_RID_CODE (qualifier) == RID_CONST)
4410 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4412 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4422 error ("invalid type modifier within array declarator");
4424 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4425 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4426 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4430 else if (TREE_CODE (type) == FUNCTION_TYPE)
4432 if (pedantic && type_quals)
4433 pedwarn ("ISO C forbids qualified function types");
4435 type = c_build_qualified_type (type, type_quals);
4436 type = build_pointer_type (type);
4437 type_quals = TYPE_UNQUALIFIED;
4439 else if (type_quals)
4440 type = c_build_qualified_type (type, type_quals);
4442 type_as_written = type;
4444 decl = build_decl (PARM_DECL, declarator, type);
4446 C_DECL_VARIABLE_SIZE (decl) = 1;
4448 /* Compute the type actually passed in the parmlist,
4449 for the case where there is no prototype.
4450 (For example, shorts and chars are passed as ints.)
4451 When there is a prototype, this is overridden later. */
4453 if (type == error_mark_node)
4454 promoted_type = type;
4456 promoted_type = c_type_promotes_to (type);
4458 DECL_ARG_TYPE (decl) = promoted_type;
4459 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4461 else if (decl_context == FIELD)
4463 /* Structure field. It may not be a function. */
4465 if (TREE_CODE (type) == FUNCTION_TYPE)
4467 error ("field `%s' declared as a function", name);
4468 type = build_pointer_type (type);
4470 else if (TREE_CODE (type) != ERROR_MARK
4471 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4473 error ("field `%s' has incomplete type", name);
4474 type = error_mark_node;
4476 /* Move type qualifiers down to element of an array. */
4477 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4479 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4481 TYPE_DOMAIN (type));
4483 /* Leave the field const or volatile as well. */
4484 type_quals = TYPE_UNQUALIFIED;
4487 decl = build_decl (FIELD_DECL, declarator, type);
4488 DECL_NONADDRESSABLE_P (decl) = bitfield;
4491 C_DECL_VARIABLE_SIZE (decl) = 1;
4493 else if (TREE_CODE (type) == FUNCTION_TYPE)
4495 /* Every function declaration is "external"
4496 except for those which are inside a function body
4497 in which `auto' is used.
4498 That is a case not specified by ANSI C,
4499 and we use it for forward declarations for nested functions. */
4500 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4501 || current_binding_level == global_binding_level);
4503 if (specbits & (1 << (int) RID_AUTO)
4504 && (pedantic || current_binding_level == global_binding_level))
4505 pedwarn ("invalid storage class for function `%s'", name);
4506 if (specbits & (1 << (int) RID_REGISTER))
4507 error ("invalid storage class for function `%s'", name);
4508 if (specbits & (1 << (int) RID_THREAD))
4509 error ("invalid storage class for function `%s'", name);
4510 /* Function declaration not at top level.
4511 Storage classes other than `extern' are not allowed
4512 and `extern' makes no difference. */
4513 if (current_binding_level != global_binding_level
4514 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4516 pedwarn ("invalid storage class for function `%s'", name);
4518 decl = build_decl (FUNCTION_DECL, declarator, type);
4519 decl = build_decl_attribute_variant (decl, decl_attr);
4521 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4522 ggc_alloc_cleared (sizeof (struct lang_decl));
4524 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4525 pedwarn ("ISO C forbids qualified function types");
4527 /* GNU C interprets a `volatile void' return type to indicate
4528 that the function does not return. */
4529 if ((type_quals & TYPE_QUAL_VOLATILE)
4530 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4531 warning ("`noreturn' function returns non-void value");
4534 DECL_EXTERNAL (decl) = 1;
4535 /* Record absence of global scope for `static' or `auto'. */
4537 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4540 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4542 /* Record presence of `inline', if it is reasonable. */
4543 if (MAIN_NAME_P (declarator))
4546 warning ("cannot inline function `main'");
4550 /* Assume that otherwise the function can be inlined. */
4551 DECL_DECLARED_INLINE_P (decl) = 1;
4553 /* Do not mark bare declarations as DECL_INLINE. Doing so
4554 in the presence of multiple declarations can result in
4555 the abstract origin pointing between the declarations,
4556 which will confuse dwarf2out. */
4559 DECL_INLINE (decl) = 1;
4560 if (specbits & (1 << (int) RID_EXTERN))
4561 current_extern_inline = 1;
4564 /* If -finline-functions, assume it can be inlined. This does
4565 two things: let the function be deferred until it is actually
4566 needed, and let dwarf2 know that the function is inlinable. */
4567 else if (flag_inline_trees == 2 && initialized)
4569 DECL_INLINE (decl) = 1;
4570 DECL_DECLARED_INLINE_P (decl) = 0;
4575 /* It's a variable. */
4576 /* An uninitialized decl with `extern' is a reference. */
4577 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4579 /* Move type qualifiers down to element of an array. */
4580 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4582 int saved_align = TYPE_ALIGN(type);
4583 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4585 TYPE_DOMAIN (type));
4586 TYPE_ALIGN (type) = saved_align;
4587 #if 0 /* Leave the variable const or volatile as well. */
4588 type_quals = TYPE_UNQUALIFIED;
4591 else if (type_quals)
4592 type = c_build_qualified_type (type, type_quals);
4594 decl = build_decl (VAR_DECL, declarator, type);
4596 C_DECL_VARIABLE_SIZE (decl) = 1;
4599 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4601 DECL_EXTERNAL (decl) = extern_ref;
4603 /* At top level, the presence of a `static' or `register' storage
4604 class specifier, or the absence of all storage class specifiers
4605 makes this declaration a definition (perhaps tentative). Also,
4606 the absence of both `static' and `register' makes it public. */
4607 if (current_binding_level == global_binding_level)
4609 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4610 | (1 << (int) RID_REGISTER)));
4611 TREE_STATIC (decl) = !extern_ref;
4613 /* Not at top level, only `static' makes a static definition. */
4616 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4617 TREE_PUBLIC (decl) = extern_ref;
4620 if (specbits & 1 << (int) RID_THREAD)
4622 if (targetm.have_tls)
4623 DECL_THREAD_LOCAL (decl) = 1;
4625 /* A mere warning is sure to result in improper semantics
4626 at runtime. Don't bother to allow this to compile. */
4627 error ("thread-local storage not supported for this target");
4631 /* Record `register' declaration for warnings on &
4632 and in case doing stupid register allocation. */
4634 if (specbits & (1 << (int) RID_REGISTER))
4635 DECL_REGISTER (decl) = 1;
4637 /* Record constancy and volatility. */
4638 c_apply_type_quals_to_decl (type_quals, decl);
4640 /* If a type has volatile components, it should be stored in memory.
4641 Otherwise, the fact that those components are volatile
4642 will be ignored, and would even crash the compiler. */
4643 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4644 c_mark_addressable (decl);
4646 decl_attributes (&decl, returned_attrs, 0);
4652 /* Decode the parameter-list info for a function type or function definition.
4653 The argument is the value returned by `get_parm_info' (or made in parse.y
4654 if there is an identifier list instead of a parameter decl list).
4655 These two functions are separate because when a function returns
4656 or receives functions then each is called multiple times but the order
4657 of calls is different. The last call to `grokparms' is always the one
4658 that contains the formal parameter names of a function definition.
4660 Store in `last_function_parms' a chain of the decls of parms.
4661 Also store in `last_function_parm_tags' a chain of the struct, union,
4662 and enum tags declared among the parms.
4664 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4666 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4667 a mere declaration. A nonempty identifier-list gets an error message
4668 when FUNCDEF_FLAG is zero. */
4671 grokparms (parms_info, funcdef_flag)
4675 tree first_parm = TREE_CHAIN (parms_info);
4677 last_function_parms = TREE_PURPOSE (parms_info);
4678 last_function_parm_tags = TREE_VALUE (parms_info);
4680 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4681 && !in_system_header)
4682 warning ("function declaration isn't a prototype");
4685 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4688 pedwarn ("parameter names (without types) in function declaration");
4690 last_function_parms = first_parm;
4697 /* We no longer test FUNCDEF_FLAG.
4698 If the arg types are incomplete in a declaration,
4699 they must include undefined tags.
4700 These tags can never be defined in the scope of the declaration,
4701 so the types can never be completed,
4702 and no call can be compiled successfully. */
4704 /* In a fcn definition, arg types must be complete. */
4707 for (parm = last_function_parms, typelt = first_parm;
4709 parm = TREE_CHAIN (parm))
4710 /* Skip over any enumeration constants declared here. */
4711 if (TREE_CODE (parm) == PARM_DECL)
4713 /* Barf if the parameter itself has an incomplete type. */
4714 tree type = TREE_VALUE (typelt);
4715 if (type == error_mark_node)
4717 if (!COMPLETE_TYPE_P (type))
4719 if (funcdef_flag && DECL_NAME (parm) != 0)
4720 error ("parameter `%s' has incomplete type",
4721 IDENTIFIER_POINTER (DECL_NAME (parm)));
4723 warning ("parameter has incomplete type");
4726 TREE_VALUE (typelt) = error_mark_node;
4727 TREE_TYPE (parm) = error_mark_node;
4731 /* This has been replaced by parm_tags_warning, which
4732 uses a more accurate criterion for what to warn
4736 /* Now warn if is a pointer to an incomplete type. */
4737 while (TREE_CODE (type) == POINTER_TYPE
4738 || TREE_CODE (type) == REFERENCE_TYPE)
4739 type = TREE_TYPE (type);
4740 type = TYPE_MAIN_VARIANT (type);
4741 if (!COMPLETE_TYPE_P (type))
4743 if (DECL_NAME (parm) != 0)
4744 warning ("parameter `%s' points to incomplete type",
4745 IDENTIFIER_POINTER (DECL_NAME (parm)));
4747 warning ("parameter points to incomplete type");
4751 typelt = TREE_CHAIN (typelt);
4758 /* Return a tree_list node with info on a parameter list just parsed.
4759 The TREE_PURPOSE is a chain of decls of those parms.
4760 The TREE_VALUE is a list of structure, union and enum tags defined.
4761 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4762 This tree_list node is later fed to `grokparms'.
4764 VOID_AT_END nonzero means append `void' to the end of the type-list.
4765 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4768 get_parm_info (void_at_end)
4774 tree tags = gettags ();
4775 tree parms = getdecls ();
4777 tree order = current_binding_level->parm_order;
4779 /* Just `void' (and no ellipsis) is special. There are really no parms.
4780 But if the `void' is qualified (by `const' or `volatile') or has a
4781 storage class specifier (`register'), then the behavior is undefined;
4782 by not counting it as the special case of `void' we will cause an
4783 error later. Typedefs for `void' are OK (see DR#157). */
4784 if (void_at_end && parms != 0
4785 && TREE_CHAIN (parms) == 0
4786 && VOID_TYPE_P (TREE_TYPE (parms))
4787 && ! TREE_THIS_VOLATILE (parms)
4788 && ! TREE_READONLY (parms)
4789 && ! DECL_REGISTER (parms)
4790 && DECL_NAME (parms) == 0)
4793 storedecls (NULL_TREE);
4794 return tree_cons (NULL_TREE, NULL_TREE,
4795 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4798 /* Extract enumerator values and other non-parms declared with the parms.
4799 Likewise any forward parm decls that didn't have real parm decls. */
4800 for (decl = parms; decl;)
4802 tree next = TREE_CHAIN (decl);
4804 if (TREE_CODE (decl) != PARM_DECL)
4806 TREE_CHAIN (decl) = new_parms;
4809 else if (TREE_ASM_WRITTEN (decl))
4811 error_with_decl (decl,
4812 "parameter `%s' has just a forward declaration");
4813 TREE_CHAIN (decl) = new_parms;
4819 /* Put the parm decls back in the order they were in in the parm list. */
4820 for (t = order; t; t = TREE_CHAIN (t))
4823 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4825 TREE_CHAIN (TREE_VALUE (t)) = 0;
4828 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4831 /* Store the parmlist in the binding level since the old one
4832 is no longer a valid list. (We have changed the chain pointers.) */
4833 storedecls (new_parms);
4835 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4836 /* There may also be declarations for enumerators if an enumeration
4837 type is declared among the parms. Ignore them here. */
4838 if (TREE_CODE (decl) == PARM_DECL)
4840 /* Since there is a prototype,
4841 args are passed in their declared types. */
4842 tree type = TREE_TYPE (decl);
4843 DECL_ARG_TYPE (decl) = type;
4844 if (PROMOTE_PROTOTYPES
4845 && INTEGRAL_TYPE_P (type)
4846 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4847 DECL_ARG_TYPE (decl) = integer_type_node;
4849 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4850 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
4851 && DECL_NAME (decl) == 0)
4853 error ("`void' in parameter list must be the entire list");
4859 return tree_cons (new_parms, tags,
4860 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
4862 return tree_cons (new_parms, tags, nreverse (types));
4865 /* At end of parameter list, warn about any struct, union or enum tags
4866 defined within. Do so because these types cannot ever become complete. */
4869 parmlist_tags_warning ()
4874 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4876 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4877 /* An anonymous union parm type is meaningful as a GNU extension.
4878 So don't warn for that. */
4879 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
4881 if (TREE_PURPOSE (elt) != 0)
4883 if (code == RECORD_TYPE)
4884 warning ("`struct %s' declared inside parameter list",
4885 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4886 else if (code == UNION_TYPE)
4887 warning ("`union %s' declared inside parameter list",
4888 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4890 warning ("`enum %s' declared inside parameter list",
4891 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4895 /* For translation these need to be separate warnings */
4896 if (code == RECORD_TYPE)
4897 warning ("anonymous struct declared inside parameter list");
4898 else if (code == UNION_TYPE)
4899 warning ("anonymous union declared inside parameter list");
4901 warning ("anonymous enum declared inside parameter list");
4905 warning ("its scope is only this definition or declaration, which is probably not what you want");
4911 /* Get the struct, enum or union (CODE says which) with tag NAME.
4912 Define the tag as a forward-reference if it is not defined. */
4915 xref_tag (code, name)
4916 enum tree_code code;
4919 /* If a cross reference is requested, look up the type
4920 already defined for this tag and return it. */
4922 tree ref = lookup_tag (code, name, current_binding_level, 0);
4923 /* If this is the right type of tag, return what we found.
4924 (This reference will be shadowed by shadow_tag later if appropriate.)
4925 If this is the wrong type of tag, do not return it. If it was the
4926 wrong type in the same binding level, we will have had an error
4927 message already; if in a different binding level and declaring
4928 a name, pending_xref_error will give an error message; but if in a
4929 different binding level and not declaring a name, this tag should
4930 shadow the previous declaration of a different type of tag, and
4931 this would not work properly if we return the reference found.
4932 (For example, with "struct foo" in an outer scope, "union foo;"
4933 must shadow that tag with a new one of union type.) */
4934 if (ref && TREE_CODE (ref) == code)
4937 /* If no such tag is yet defined, create a forward-reference node
4938 and record it as the "definition".
4939 When a real declaration of this type is found,
4940 the forward-reference will be altered into a real type. */
4942 ref = make_node (code);
4943 if (code == ENUMERAL_TYPE)
4945 /* Give the type a default layout like unsigned int
4946 to avoid crashing if it does not get defined. */
4947 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4948 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4949 TYPE_USER_ALIGN (ref) = 0;
4950 TREE_UNSIGNED (ref) = 1;
4951 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4952 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4953 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4956 pushtag (name, ref);
4961 /* Make sure that the tag NAME is defined *in the current binding level*
4962 at least as a forward reference.
4963 CODE says which kind of tag NAME ought to be. */
4966 start_struct (code, name)
4967 enum tree_code code;
4970 /* If there is already a tag defined at this binding level
4971 (as a forward reference), just return it. */
4976 ref = lookup_tag (code, name, current_binding_level, 1);
4977 if (ref && TREE_CODE (ref) == code)
4979 if (TYPE_FIELDS (ref))
4981 if (code == UNION_TYPE)
4982 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4984 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4989 /* Otherwise create a forward-reference just so the tag is in scope. */
4991 ref = make_node (code);
4992 pushtag (name, ref);
4995 C_TYPE_BEING_DEFINED (ref) = 1;
4996 TYPE_PACKED (ref) = flag_pack_struct;
5000 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5001 of a structure component, returning a FIELD_DECL node.
5002 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5004 This is done during the parsing of the struct declaration.
5005 The FIELD_DECL nodes are chained together and the lot of them
5006 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5009 grokfield (filename, line, declarator, declspecs, width)
5010 const char *filename ATTRIBUTE_UNUSED;
5011 int line ATTRIBUTE_UNUSED;
5012 tree declarator, declspecs, width;
5016 if (declarator == NULL_TREE && width == NULL_TREE)
5018 /* This is an unnamed decl.
5020 If we have something of the form "union { list } ;" then this
5021 is the anonymous union extension. Similarly for struct.
5023 If this is something of the form "struct foo;", then
5024 If MS extensions are enabled, this is handled as an
5026 Otherwise this is a forward declaration of a structure tag.
5028 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5029 If MS extensions are enabled and foo names a structure, then
5030 again this is an anonymous struct.
5031 Otherwise this is an error.
5033 Oh what a horrid tangled web we weave. I wonder if MS consciously
5034 took this from Plan 9 or if it was an accident of implementation
5035 that took root before someone noticed the bug... */
5037 tree type = TREE_VALUE (declspecs);
5039 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
5040 type = TREE_TYPE (type);
5041 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
5043 if (flag_ms_extensions)
5046 goto warn_unnamed_field;
5047 else if (TYPE_NAME (type) == NULL)
5050 goto warn_unnamed_field;
5055 warning ("declaration does not declare anything");
5060 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5062 finish_decl (value, NULL_TREE, NULL_TREE);
5063 DECL_INITIAL (value) = width;
5066 objc_check_decl (value);
5070 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5071 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5072 ATTRIBUTES are attributes to be applied to the structure. */
5075 finish_struct (t, fieldlist, attributes)
5081 int toplevel = global_binding_level == current_binding_level;
5082 int saw_named_field;
5084 /* If this type was previously laid out as a forward reference,
5085 make sure we lay it out again. */
5089 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5091 /* Nameless union parm types are useful as GCC extension. */
5092 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5093 /* Otherwise, warn about any struct or union def. in parmlist. */
5094 if (in_parm_level_p ())
5097 pedwarn ("%s defined inside parms",
5098 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5100 warning ("%s defined inside parms",
5101 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5106 for (x = fieldlist; x; x = TREE_CHAIN (x))
5107 if (DECL_NAME (x) != 0)
5111 pedwarn ("%s has no %s",
5112 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5113 fieldlist ? _("named members") : _("members"));
5116 /* Install struct as DECL_CONTEXT of each field decl.
5117 Also process specified field sizes,m which is found in the DECL_INITIAL.
5118 Store 0 there, except for ": 0" fields (so we can find them
5119 and delete them, below). */
5121 saw_named_field = 0;
5122 for (x = fieldlist; x; x = TREE_CHAIN (x))
5124 DECL_CONTEXT (x) = t;
5125 DECL_PACKED (x) |= TYPE_PACKED (t);
5127 /* If any field is const, the structure type is pseudo-const. */
5128 if (TREE_READONLY (x))
5129 C_TYPE_FIELDS_READONLY (t) = 1;
5132 /* A field that is pseudo-const makes the structure likewise. */
5133 tree t1 = TREE_TYPE (x);
5134 while (TREE_CODE (t1) == ARRAY_TYPE)
5135 t1 = TREE_TYPE (t1);
5136 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5137 && C_TYPE_FIELDS_READONLY (t1))
5138 C_TYPE_FIELDS_READONLY (t) = 1;
5141 /* Any field that is volatile means variables of this type must be
5142 treated in some ways as volatile. */
5143 if (TREE_THIS_VOLATILE (x))
5144 C_TYPE_FIELDS_VOLATILE (t) = 1;
5146 /* Any field of nominal variable size implies structure is too. */
5147 if (C_DECL_VARIABLE_SIZE (x))
5148 C_TYPE_VARIABLE_SIZE (t) = 1;
5150 /* Detect invalid nested redefinition. */
5151 if (TREE_TYPE (x) == t)
5152 error ("nested redefinition of `%s'",
5153 IDENTIFIER_POINTER (TYPE_NAME (t)));
5155 /* Detect invalid bit-field size. */
5156 if (DECL_INITIAL (x))
5157 STRIP_NOPS (DECL_INITIAL (x));
5158 if (DECL_INITIAL (x))
5160 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5161 constant_expression_warning (DECL_INITIAL (x));
5165 "bit-field `%s' width not an integer constant");
5166 DECL_INITIAL (x) = NULL;
5170 /* Detect invalid bit-field type. */
5171 if (DECL_INITIAL (x)
5172 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5173 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5174 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5176 error_with_decl (x, "bit-field `%s' has invalid type");
5177 DECL_INITIAL (x) = NULL;
5180 if (DECL_INITIAL (x) && pedantic
5181 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5182 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5183 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5184 /* Accept an enum that's equivalent to int or unsigned int. */
5185 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5186 && (TYPE_PRECISION (TREE_TYPE (x))
5187 == TYPE_PRECISION (integer_type_node))))
5188 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5190 /* Detect and ignore out of range field width and process valid
5192 if (DECL_INITIAL (x))
5195 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
5196 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5198 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5199 error_with_decl (x, "negative width in bit-field `%s'");
5200 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5201 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5202 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5203 error_with_decl (x, "zero width for bit-field `%s'");
5206 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5207 unsigned HOST_WIDE_INT width
5208 = tree_low_cst (DECL_INITIAL (x), 1);
5210 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5211 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5212 TREE_UNSIGNED (TREE_TYPE (x)))
5214 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5215 TREE_UNSIGNED (TREE_TYPE (x))))))
5216 warning_with_decl (x,
5217 "`%s' is narrower than values of its type");
5219 DECL_SIZE (x) = bitsize_int (width);
5220 DECL_BIT_FIELD (x) = 1;
5221 SET_DECL_C_BIT_FIELD (x);
5224 && ! (* targetm.ms_bitfield_layout_p) (t))
5226 /* field size 0 => force desired amount of alignment. */
5227 #ifdef EMPTY_FIELD_BOUNDARY
5228 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5230 #ifdef PCC_BITFIELD_TYPE_MATTERS
5231 if (PCC_BITFIELD_TYPE_MATTERS)
5233 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5234 TYPE_ALIGN (TREE_TYPE (x)));
5235 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5242 else if (TREE_TYPE (x) != error_mark_node)
5244 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5245 : TYPE_ALIGN (TREE_TYPE (x)));
5247 /* Non-bit-fields are aligned for their type, except packed
5248 fields which require only BITS_PER_UNIT alignment. */
5249 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5250 if (! DECL_PACKED (x))
5251 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5254 DECL_INITIAL (x) = 0;
5256 /* Detect flexible array member in an invalid context. */
5257 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5258 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5259 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5260 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5262 if (TREE_CODE (t) == UNION_TYPE)
5263 error_with_decl (x, "flexible array member in union");
5264 else if (TREE_CHAIN (x) != NULL_TREE)
5265 error_with_decl (x, "flexible array member not at end of struct");
5266 else if (! saw_named_field)
5267 error_with_decl (x, "flexible array member in otherwise empty struct");
5270 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5271 && flexible_array_type_p (TREE_TYPE (x)))
5272 pedwarn_with_decl (x, "invalid use of structure with flexible array member");
5275 saw_named_field = 1;
5278 /* Delete all duplicate fields from the fieldlist */
5279 for (x = fieldlist; x && TREE_CHAIN (x);)
5280 /* Anonymous fields aren't duplicates. */
5281 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5289 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5295 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5297 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5298 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5304 /* Now we have the nearly final fieldlist. Record it,
5305 then lay out the structure or union (including the fields). */
5307 TYPE_FIELDS (t) = fieldlist;
5311 /* Delete all zero-width bit-fields from the fieldlist */
5313 tree *fieldlistp = &fieldlist;
5315 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5316 *fieldlistp = TREE_CHAIN (*fieldlistp);
5318 fieldlistp = &TREE_CHAIN (*fieldlistp);
5321 /* Now we have the truly final field list.
5322 Store it in this type and in the variants. */
5324 TYPE_FIELDS (t) = fieldlist;
5326 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5328 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5329 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5330 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5331 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5334 /* If this was supposed to be a transparent union, but we can't
5335 make it one, warn and turn off the flag. */
5336 if (TREE_CODE (t) == UNION_TYPE
5337 && TYPE_TRANSPARENT_UNION (t)
5338 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5340 TYPE_TRANSPARENT_UNION (t) = 0;
5341 warning ("union cannot be made transparent");
5344 /* If this structure or union completes the type of any previous
5345 variable declaration, lay it out and output its rtl. */
5347 if (current_binding_level->incomplete_list != NULL_TREE)
5349 tree prev = NULL_TREE;
5351 for (x = current_binding_level->incomplete_list; x; x = TREE_CHAIN (x))
5353 tree decl = TREE_VALUE (x);
5355 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5356 && TREE_CODE (decl) != TYPE_DECL)
5358 layout_decl (decl, 0);
5359 /* This is a no-op in c-lang.c or something real in objc-act.c. */
5361 objc_check_decl (decl);
5362 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5365 /* Unlink X from the incomplete list. */
5367 TREE_CHAIN (prev) = TREE_CHAIN (x);
5369 current_binding_level->incomplete_list = TREE_CHAIN (x);
5371 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5372 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5374 tree element = TREE_TYPE (decl);
5375 while (TREE_CODE (element) == ARRAY_TYPE)
5376 element = TREE_TYPE (element);
5379 layout_array_type (TREE_TYPE (decl));
5380 if (TREE_CODE (decl) != TYPE_DECL)
5382 layout_decl (decl, 0);
5384 objc_check_decl (decl);
5385 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5389 /* Unlink X from the incomplete list. */
5391 TREE_CHAIN (prev) = TREE_CHAIN (x);
5393 current_binding_level->incomplete_list = TREE_CHAIN (x);
5399 /* Finish debugging output for this type. */
5400 rest_of_type_compilation (t, toplevel);
5405 /* Lay out the type T, and its element type, and so on. */
5408 layout_array_type (t)
5411 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5412 layout_array_type (TREE_TYPE (t));
5416 /* Begin compiling the definition of an enumeration type.
5417 NAME is its name (or null if anonymous).
5418 Returns the type object, as yet incomplete.
5419 Also records info about it so that build_enumerator
5420 may be used to declare the individual values as they are read. */
5428 /* If this is the real definition for a previous forward reference,
5429 fill in the contents in the same object that used to be the
5430 forward reference. */
5433 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5435 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5437 enumtype = make_node (ENUMERAL_TYPE);
5438 pushtag (name, enumtype);
5441 C_TYPE_BEING_DEFINED (enumtype) = 1;
5443 if (TYPE_VALUES (enumtype) != 0)
5445 /* This enum is a named one that has been declared already. */
5446 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5448 /* Completely replace its old definition.
5449 The old enumerators remain defined, however. */
5450 TYPE_VALUES (enumtype) = 0;
5453 enum_next_value = integer_zero_node;
5456 if (flag_short_enums)
5457 TYPE_PACKED (enumtype) = 1;
5462 /* After processing and defining all the values of an enumeration type,
5463 install their decls in the enumeration type and finish it off.
5464 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5465 and ATTRIBUTES are the specified attributes.
5466 Returns ENUMTYPE. */
5469 finish_enum (enumtype, values, attributes)
5475 tree minnode = 0, maxnode = 0, enum_value_type;
5476 int precision, unsign;
5477 int toplevel = (global_binding_level == current_binding_level);
5479 if (in_parm_level_p ())
5480 warning ("enum defined inside parms");
5482 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5484 /* Calculate the maximum value of any enumerator in this type. */
5486 if (values == error_mark_node)
5487 minnode = maxnode = integer_zero_node;
5490 minnode = maxnode = TREE_VALUE (values);
5491 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5493 tree value = TREE_VALUE (pair);
5494 if (tree_int_cst_lt (maxnode, value))
5496 if (tree_int_cst_lt (value, minnode))
5501 /* Construct the final type of this enumeration. It is the same
5502 as one of the integral types - the narrowest one that fits, except
5503 that normally we only go as narrow as int - and signed iff any of
5504 the values are negative. */
5505 unsign = (tree_int_cst_sgn (minnode) >= 0);
5506 precision = MAX (min_precision (minnode, unsign),
5507 min_precision (maxnode, unsign));
5508 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5510 tree narrowest = c_common_type_for_size (precision, unsign);
5513 warning ("enumeration values exceed range of largest integer");
5514 narrowest = long_long_integer_type_node;
5517 precision = TYPE_PRECISION (narrowest);
5520 precision = TYPE_PRECISION (integer_type_node);
5522 if (precision == TYPE_PRECISION (integer_type_node))
5523 enum_value_type = c_common_type_for_size (precision, 0);
5525 enum_value_type = enumtype;
5527 TYPE_MIN_VALUE (enumtype) = minnode;
5528 TYPE_MAX_VALUE (enumtype) = maxnode;
5529 TYPE_PRECISION (enumtype) = precision;
5530 TREE_UNSIGNED (enumtype) = unsign;
5531 TYPE_SIZE (enumtype) = 0;
5532 layout_type (enumtype);
5534 if (values != error_mark_node)
5536 /* Change the type of the enumerators to be the enum type. We
5537 need to do this irrespective of the size of the enum, for
5538 proper type checking. Replace the DECL_INITIALs of the
5539 enumerators, and the value slots of the list, with copies
5540 that have the enum type; they cannot be modified in place
5541 because they may be shared (e.g. integer_zero_node) Finally,
5542 change the purpose slots to point to the names of the decls. */
5543 for (pair = values; pair; pair = TREE_CHAIN (pair))
5545 tree enu = TREE_PURPOSE (pair);
5547 TREE_TYPE (enu) = enumtype;
5548 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5549 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5550 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5551 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5552 DECL_MODE (enu) = TYPE_MODE (enumtype);
5554 /* The ISO C Standard mandates enumerators to have type int,
5555 even though the underlying type of an enum type is
5556 unspecified. Here we convert any enumerators that fit in
5557 an int to type int, to avoid promotions to unsigned types
5558 when comparing integers with enumerators that fit in the
5559 int range. When -pedantic is given, build_enumerator()
5560 would have already taken care of those that don't fit. */
5561 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5562 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5564 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5566 TREE_PURPOSE (pair) = DECL_NAME (enu);
5567 TREE_VALUE (pair) = DECL_INITIAL (enu);
5570 TYPE_VALUES (enumtype) = values;
5573 /* Fix up all variant types of this enum type. */
5574 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5576 if (tem == enumtype)
5578 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5579 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5580 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5581 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5582 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5583 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5584 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5585 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5586 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5587 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5590 /* Finish debugging output for this type. */
5591 rest_of_type_compilation (enumtype, toplevel);
5596 /* Build and install a CONST_DECL for one value of the
5597 current enumeration type (one that was begun with start_enum).
5598 Return a tree-list containing the CONST_DECL and its value.
5599 Assignment of sequential values by default is handled here. */
5602 build_enumerator (name, value)
5607 /* Validate and default VALUE. */
5609 /* Remove no-op casts from the value. */
5611 STRIP_TYPE_NOPS (value);
5615 if (TREE_CODE (value) == INTEGER_CST)
5617 value = default_conversion (value);
5618 constant_expression_warning (value);
5622 error ("enumerator value for `%s' not integer constant",
5623 IDENTIFIER_POINTER (name));
5628 /* Default based on previous value. */
5629 /* It should no longer be possible to have NON_LVALUE_EXPR
5633 value = enum_next_value;
5635 error ("overflow in enumeration values");
5638 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5640 pedwarn ("ISO C restricts enumerator values to range of `int'");
5641 value = convert (integer_type_node, value);
5644 /* Set basis for default for next value. */
5645 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5646 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5648 /* Now create a declaration for the enum value name. */
5650 type = TREE_TYPE (value);
5651 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5652 TYPE_PRECISION (integer_type_node)),
5653 (TYPE_PRECISION (type)
5654 >= TYPE_PRECISION (integer_type_node)
5655 && TREE_UNSIGNED (type)));
5657 decl = build_decl (CONST_DECL, name, type);
5658 DECL_INITIAL (decl) = convert (type, value);
5661 return tree_cons (decl, value, NULL_TREE);
5665 /* Create the FUNCTION_DECL for a function definition.
5666 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5667 the declaration; they describe the function's name and the type it returns,
5668 but twisted together in a fashion that parallels the syntax of C.
5670 This function creates a binding context for the function body
5671 as well as setting up the FUNCTION_DECL in current_function_decl.
5673 Returns 1 on success. If the DECLARATOR is not suitable for a function
5674 (it defines a datum instead), we return 0, which tells
5675 yyparse to report a parse error. */
5678 start_function (declspecs, declarator, attributes)
5679 tree declarator, declspecs, attributes;
5681 tree decl1, old_decl;
5683 int old_immediate_size_expand = immediate_size_expand;
5685 current_function_returns_value = 0; /* Assume, until we see it does. */
5686 current_function_returns_null = 0;
5687 current_function_returns_abnormally = 0;
5688 warn_about_return_type = 0;
5689 current_extern_inline = 0;
5691 shadowed_labels = 0;
5693 /* Don't expand any sizes in the return type of the function. */
5694 immediate_size_expand = 0;
5696 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5698 /* If the declarator is not suitable for a function definition,
5699 cause a syntax error. */
5702 immediate_size_expand = old_immediate_size_expand;
5706 decl_attributes (&decl1, attributes, 0);
5708 /* If #pragma weak was used, mark the decl weak now. */
5709 if (current_binding_level == global_binding_level)
5710 maybe_apply_pragma_weak (decl1);
5712 if (DECL_DECLARED_INLINE_P (decl1)
5713 && DECL_UNINLINABLE (decl1)
5714 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5715 warning_with_decl (decl1,
5716 "inline function `%s' given attribute noinline");
5718 announce_function (decl1);
5720 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5722 error ("return type is an incomplete type");
5723 /* Make it return void instead. */
5725 = build_function_type (void_type_node,
5726 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5729 if (warn_about_return_type)
5730 pedwarn_c99 ("return type defaults to `int'");
5732 /* Save the parm names or decls from this function's declarator
5733 where store_parm_decls will find them. */
5734 current_function_parms = last_function_parms;
5735 current_function_parm_tags = last_function_parm_tags;
5737 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5738 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5739 DECL_INITIAL (decl1) = error_mark_node;
5741 /* If this definition isn't a prototype and we had a prototype declaration
5742 before, copy the arg type info from that prototype.
5743 But not if what we had before was a builtin function. */
5744 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5745 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5746 && !DECL_BUILT_IN (old_decl)
5747 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5748 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5749 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5751 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5752 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5753 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5756 /* If there is no explicit declaration, look for any out-of-scope implicit
5759 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5761 /* Optionally warn of old-fashioned def with no previous prototype. */
5762 if (warn_strict_prototypes
5763 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5765 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
5766 || (DECL_BUILT_IN (old_decl)
5767 && ! C_DECL_ANTICIPATED (old_decl)))))
5768 warning ("function declaration isn't a prototype");
5769 /* Optionally warn of any global def with no previous prototype. */
5770 else if (warn_missing_prototypes
5771 && TREE_PUBLIC (decl1)
5773 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
5774 || (DECL_BUILT_IN (old_decl)
5775 && ! C_DECL_ANTICIPATED (old_decl))))
5776 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5777 warning_with_decl (decl1, "no previous prototype for `%s'");
5778 /* Optionally warn of any def with no previous prototype
5779 if the function has already been used. */
5780 else if (warn_missing_prototypes
5781 && old_decl != 0 && TREE_USED (old_decl)
5782 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5783 warning_with_decl (decl1,
5784 "`%s' was used with no prototype before its definition");
5785 /* Optionally warn of any global def with no previous declaration. */
5786 else if (warn_missing_declarations
5787 && TREE_PUBLIC (decl1)
5789 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5790 warning_with_decl (decl1, "no previous declaration for `%s'");
5791 /* Optionally warn of any def with no previous declaration
5792 if the function has already been used. */
5793 else if (warn_missing_declarations
5794 && old_decl != 0 && TREE_USED (old_decl)
5795 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5796 warning_with_decl (decl1,
5797 "`%s' was used with no declaration before its definition");
5799 /* This is a definition, not a reference.
5800 So normally clear DECL_EXTERNAL.
5801 However, `extern inline' acts like a declaration
5802 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5803 DECL_EXTERNAL (decl1) = current_extern_inline;
5805 /* This function exists in static storage.
5806 (This does not mean `static' in the C sense!) */
5807 TREE_STATIC (decl1) = 1;
5809 /* A nested function is not global. */
5810 if (current_function_decl != 0)
5811 TREE_PUBLIC (decl1) = 0;
5813 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5814 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5819 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5820 != integer_type_node)
5821 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5823 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5824 args = TREE_CHAIN (args))
5826 tree type = args ? TREE_VALUE (args) : 0;
5828 if (type == void_type_node)
5835 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5836 pedwarn_with_decl (decl1,
5837 "first argument of `%s' should be `int'");
5841 if (TREE_CODE (type) != POINTER_TYPE
5842 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5843 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5845 pedwarn_with_decl (decl1,
5846 "second argument of `%s' should be `char **'");
5850 if (TREE_CODE (type) != POINTER_TYPE
5851 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5852 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5854 pedwarn_with_decl (decl1,
5855 "third argument of `%s' should probably be `char **'");
5860 /* It is intentional that this message does not mention the third
5861 argument because it's only mentioned in an appendix of the
5863 if (argct > 0 && (argct < 2 || argct > 3))
5864 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5866 if (! TREE_PUBLIC (decl1))
5867 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5870 /* Record the decl so that the function name is defined.
5871 If we already have a decl for this name, and it is a FUNCTION_DECL,
5872 use the old decl. */
5874 current_function_decl = pushdecl (decl1);
5877 declare_parm_level (1);
5878 current_binding_level->subblocks_tag_transparent = 1;
5880 make_decl_rtl (current_function_decl, NULL);
5882 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5883 /* Promote the value to int before returning it. */
5884 if (c_promoting_integer_type_p (restype))
5886 /* It retains unsignedness if not really getting wider. */
5887 if (TREE_UNSIGNED (restype)
5888 && (TYPE_PRECISION (restype)
5889 == TYPE_PRECISION (integer_type_node)))
5890 restype = unsigned_type_node;
5892 restype = integer_type_node;
5894 DECL_RESULT (current_function_decl)
5895 = build_decl (RESULT_DECL, NULL_TREE, restype);
5897 /* If this fcn was already referenced via a block-scope `extern' decl
5898 (or an implicit decl), propagate certain information about the usage. */
5899 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5900 TREE_ADDRESSABLE (current_function_decl) = 1;
5902 immediate_size_expand = old_immediate_size_expand;
5904 start_fname_decls ();
5909 /* Store the parameter declarations into the current function declaration.
5910 This is called after parsing the parameter declarations, before
5911 digesting the body of the function.
5913 For an old-style definition, modify the function's type
5914 to specify at least the number of arguments. */
5919 tree fndecl = current_function_decl;
5922 /* This is either a chain of PARM_DECLs (if a prototype was used)
5923 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5924 tree specparms = current_function_parms;
5926 /* This is a list of types declared among parms in a prototype. */
5927 tree parmtags = current_function_parm_tags;
5929 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5930 tree parmdecls = getdecls ();
5932 /* This is a chain of any other decls that came in among the parm
5933 declarations. If a parm is declared with enum {foo, bar} x;
5934 then CONST_DECLs for foo and bar are put here. */
5937 /* The function containing FNDECL, if any. */
5938 tree context = decl_function_context (fndecl);
5940 /* Nonzero if this definition is written with a prototype. */
5943 int saved_warn_shadow = warn_shadow;
5945 /* Don't re-emit shadow warnings. */
5948 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5950 /* This case is when the function was defined with an ANSI prototype.
5951 The parms already have decls, so we need not do anything here
5952 except record them as in effect
5953 and complain if any redundant old-style parm decls were written. */
5964 error_with_decl (fndecl,
5965 "parm types given both in parmlist and separately");
5966 /* Get rid of the erroneous decls; don't keep them on
5967 the list of parms, since they might not be PARM_DECLs. */
5968 for (decl = current_binding_level->names;
5969 decl; decl = TREE_CHAIN (decl))
5970 if (DECL_NAME (decl))
5971 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5972 for (link = current_binding_level->shadowed;
5973 link; link = TREE_CHAIN (link))
5974 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5975 current_binding_level->names = 0;
5976 current_binding_level->shadowed = 0;
5979 specparms = nreverse (specparms);
5980 for (parm = specparms; parm; parm = next)
5982 next = TREE_CHAIN (parm);
5983 if (TREE_CODE (parm) == PARM_DECL)
5985 if (DECL_NAME (parm) == 0)
5986 error_with_decl (parm, "parameter name omitted");
5987 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
5988 && VOID_TYPE_P (TREE_TYPE (parm)))
5990 error_with_decl (parm, "parameter `%s' declared void");
5991 /* Change the type to error_mark_node so this parameter
5992 will be ignored by assign_parms. */
5993 TREE_TYPE (parm) = error_mark_node;
5999 /* If we find an enum constant or a type tag,
6000 put it aside for the moment. */
6001 TREE_CHAIN (parm) = 0;
6002 others = chainon (others, parm);
6006 /* Get the decls in their original chain order
6007 and record in the function. */
6008 DECL_ARGUMENTS (fndecl) = getdecls ();
6011 /* If this function takes a variable number of arguments,
6012 add a phony parameter to the end of the parm list,
6013 to represent the position of the first unnamed argument. */
6014 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6017 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6018 /* Let's hope the address of the unnamed parm
6019 won't depend on its type. */
6020 TREE_TYPE (dummy) = integer_type_node;
6021 DECL_ARG_TYPE (dummy) = integer_type_node;
6022 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6026 /* Now pushdecl the enum constants. */
6027 for (parm = others; parm; parm = next)
6029 next = TREE_CHAIN (parm);
6030 if (DECL_NAME (parm) == 0)
6032 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6034 else if (TREE_CODE (parm) != PARM_DECL)
6038 storetags (chainon (parmtags, gettags ()));
6042 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6043 each with a parm name as the TREE_VALUE.
6045 PARMDECLS is a chain of declarations for parameters.
6046 Warning! It can also contain CONST_DECLs which are not parameters
6047 but are names of enumerators of any enum types
6048 declared among the parameters.
6050 First match each formal parameter name with its declaration.
6051 Associate decls with the names and store the decls
6052 into the TREE_PURPOSE slots. */
6054 /* We use DECL_WEAK as a flag to show which parameters have been
6055 seen already since it is not used on PARM_DECL or CONST_DECL. */
6056 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6057 DECL_WEAK (parm) = 0;
6059 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6061 tree tail, found = NULL;
6063 if (TREE_VALUE (parm) == 0)
6065 error_with_decl (fndecl,
6066 "parameter name missing from parameter list");
6067 TREE_PURPOSE (parm) = 0;
6071 /* See if any of the parmdecls specifies this parm by name.
6072 Ignore any enumerator decls. */
6073 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6074 if (DECL_NAME (tail) == TREE_VALUE (parm)
6075 && TREE_CODE (tail) == PARM_DECL)
6081 /* If declaration already marked, we have a duplicate name.
6082 Complain, and don't use this decl twice. */
6083 if (found && DECL_WEAK (found))
6085 error_with_decl (found, "multiple parameters named `%s'");
6089 /* If the declaration says "void", complain and ignore it. */
6090 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6092 error_with_decl (found, "parameter `%s' declared void");
6093 TREE_TYPE (found) = integer_type_node;
6094 DECL_ARG_TYPE (found) = integer_type_node;
6095 layout_decl (found, 0);
6098 /* If no declaration found, default to int. */
6101 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6103 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6104 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6105 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6107 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6108 else if (extra_warnings)
6109 warning_with_decl (found, "type of `%s' defaults to `int'");
6113 TREE_PURPOSE (parm) = found;
6115 /* Mark this decl as "already found". */
6116 DECL_WEAK (found) = 1;
6119 /* Put anything which is on the parmdecls chain and which is
6120 not a PARM_DECL onto the list NONPARMS. (The types of
6121 non-parm things which might appear on the list include
6122 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6123 any actual PARM_DECLs not matched with any names. */
6126 for (parm = parmdecls; parm;)
6128 tree next = TREE_CHAIN (parm);
6129 TREE_CHAIN (parm) = 0;
6131 if (TREE_CODE (parm) != PARM_DECL)
6132 nonparms = chainon (nonparms, parm);
6135 /* Complain about args with incomplete types. */
6136 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6138 error_with_decl (parm, "parameter `%s' has incomplete type");
6139 TREE_TYPE (parm) = error_mark_node;
6142 if (! DECL_WEAK (parm))
6144 error_with_decl (parm,
6145 "declaration for parameter `%s' but no such parameter");
6146 /* Pretend the parameter was not missing.
6147 This gets us to a standard state and minimizes
6148 further error messages. */
6150 = chainon (specparms,
6151 tree_cons (parm, NULL_TREE, NULL_TREE));
6158 /* Chain the declarations together in the order of the list of
6159 names. Store that chain in the function decl, replacing the
6162 DECL_ARGUMENTS (fndecl) = 0;
6165 for (last = 0; parm; parm = TREE_CHAIN (parm))
6166 if (TREE_PURPOSE (parm))
6169 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6171 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6172 last = TREE_PURPOSE (parm);
6173 TREE_CHAIN (last) = 0;
6177 /* If there was a previous prototype,
6178 set the DECL_ARG_TYPE of each argument according to
6179 the type previously specified, and report any mismatches. */
6181 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6184 for (parm = DECL_ARGUMENTS (fndecl),
6185 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6186 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6187 != void_type_node));
6188 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6190 if (parm == 0 || type == 0
6191 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6193 error ("number of arguments doesn't match prototype");
6194 error_with_file_and_line (current_function_prototype_file,
6195 current_function_prototype_line,
6196 "prototype declaration");
6199 /* Type for passing arg must be consistent with that
6200 declared for the arg. ISO C says we take the unqualified
6201 type for parameters declared with qualified type. */
6202 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6203 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6205 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6206 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6208 /* Adjust argument to match prototype. E.g. a previous
6209 `int foo(float);' prototype causes
6210 `int foo(x) float x; {...}' to be treated like
6211 `int foo(float x) {...}'. This is particularly
6212 useful for argument types like uid_t. */
6213 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6215 if (PROMOTE_PROTOTYPES
6216 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6217 && TYPE_PRECISION (TREE_TYPE (parm))
6218 < TYPE_PRECISION (integer_type_node))
6219 DECL_ARG_TYPE (parm) = integer_type_node;
6223 pedwarn ("promoted argument `%s' doesn't match prototype",
6224 IDENTIFIER_POINTER (DECL_NAME (parm)));
6225 warning_with_file_and_line
6226 (current_function_prototype_file,
6227 current_function_prototype_line,
6228 "prototype declaration");
6233 error ("argument `%s' doesn't match prototype",
6234 IDENTIFIER_POINTER (DECL_NAME (parm)));
6235 error_with_file_and_line (current_function_prototype_file,
6236 current_function_prototype_line,
6237 "prototype declaration");
6241 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6244 /* Otherwise, create a prototype that would match. */
6248 tree actual = 0, last = 0, type;
6250 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6252 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6254 TREE_CHAIN (last) = type;
6259 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6261 TREE_CHAIN (last) = type;
6265 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6266 of the type of this function, but we need to avoid having this
6267 affect the types of other similarly-typed functions, so we must
6268 first force the generation of an identical (but separate) type
6269 node for the relevant function type. The new node we create
6270 will be a variant of the main variant of the original function
6273 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6275 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6278 /* Now store the final chain of decls for the arguments
6279 as the decl-chain of the current lexical scope.
6280 Put the enumerators in as well, at the front so that
6281 DECL_ARGUMENTS is not modified. */
6283 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6286 /* Make sure the binding level for the top of the function body
6287 gets a BLOCK if there are any in the function.
6288 Otherwise, the dbx output is wrong. */
6290 keep_next_if_subblocks = 1;
6292 /* ??? This might be an improvement,
6293 but needs to be thought about some more. */
6295 keep_next_level_flag = 1;
6298 /* Write a record describing this function definition to the prototypes
6299 file (if requested). */
6301 gen_aux_info_record (fndecl, 1, 0, prototype);
6303 /* Initialize the RTL code for the function. */
6304 init_function_start (fndecl, input_filename, lineno);
6306 /* Begin the statement tree for this function. */
6307 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6309 /* If this is a nested function, save away the sizes of any
6310 variable-size types so that we can expand them when generating
6316 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6317 = nreverse (get_pending_sizes ());
6318 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6321 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6324 /* This function is being processed in whole-function mode. */
6325 cfun->x_whole_function_mode_p = 1;
6327 /* Even though we're inside a function body, we still don't want to
6328 call expand_expr to calculate the size of a variable-sized array.
6329 We haven't necessarily assigned RTL to all variables yet, so it's
6330 not safe to try to expand expressions involving them. */
6331 immediate_size_expand = 0;
6332 cfun->x_dont_save_pending_sizes_p = 1;
6334 warn_shadow = saved_warn_shadow;
6337 /* Finish up a function declaration and compile that function
6338 all the way to assembler language output. The free the storage
6339 for the function definition.
6341 This is called after parsing the body of the function definition.
6343 NESTED is nonzero if the function being finished is nested in another.
6344 CAN_DEFER_P is nonzero if the function may be deferred. */
6347 finish_function (nested, can_defer_p)
6351 tree fndecl = current_function_decl;
6354 /* This caused &foo to be of type ptr-to-const-function which then
6355 got a warning when stored in a ptr-to-function variable. */
6356 TREE_READONLY (fndecl) = 1;
6360 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6362 /* Must mark the RESULT_DECL as being in this function. */
6364 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6366 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6368 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6369 != integer_type_node)
6371 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6372 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6374 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6378 #ifdef DEFAULT_MAIN_RETURN
6379 /* Make it so that `main' always returns success by default. */
6380 DEFAULT_MAIN_RETURN;
6383 c_expand_return (integer_zero_node);
6388 finish_fname_decls ();
6390 /* Tie off the statement tree for this function. */
6391 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6393 /* Complain if there's just no return statement. */
6394 if (warn_return_type
6395 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6396 && !current_function_returns_value && !current_function_returns_null
6397 /* Don't complain if we abort. */
6398 && !current_function_returns_abnormally
6399 /* Don't warn for main(). */
6400 && !MAIN_NAME_P (DECL_NAME (fndecl))
6401 /* Or if they didn't actually specify a return type. */
6402 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6403 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6404 inline function, as we might never be compiled separately. */
6405 && DECL_INLINE (fndecl))
6406 warning ("no return statement in function returning non-void");
6408 /* Clear out memory we no longer need. */
6409 free_after_parsing (cfun);
6410 /* Since we never call rest_of_compilation, we never clear
6411 CFUN. Do so explicitly. */
6412 free_after_compilation (cfun);
6415 if (flag_unit_at_a_time)
6417 cgraph_finalize_function (fndecl, DECL_SAVED_TREE (fndecl));
6418 current_function_decl = NULL;
6424 /* Function is parsed.
6425 Generate RTL for the body of this function or defer
6426 it for later expansion. */
6427 int uninlinable = 1;
6429 /* There's no reason to do any of the work here if we're only doing
6430 semantic analysis; this code just generates RTL. */
6431 if (flag_syntax_only)
6433 current_function_decl = NULL;
6434 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6438 if (flag_inline_trees)
6440 /* First, cache whether the current function is inlinable. Some
6441 predicates depend on cfun and current_function_decl to
6442 function completely. */
6443 timevar_push (TV_INTEGRATION);
6444 uninlinable = ! tree_inlinable_function_p (fndecl);
6446 if (! uninlinable && can_defer_p
6447 /* Save function tree for inlining. Should return 0 if the
6448 language does not support function deferring or the
6449 function could not be deferred. */
6450 && defer_fn (fndecl))
6452 /* Let the back-end know that this function exists. */
6453 (*debug_hooks->deferred_inline_function) (fndecl);
6454 timevar_pop (TV_INTEGRATION);
6455 current_function_decl = NULL;
6459 /* Then, inline any functions called in it. */
6460 optimize_inline_calls (fndecl);
6461 timevar_pop (TV_INTEGRATION);
6464 c_expand_body (fndecl);
6468 /* Allow the body of the function to be garbage collected. */
6469 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6472 /* Let the error reporting routines know that we're outside a
6473 function. For a nested function, this value is used in
6474 c_pop_function_context and then reset via pop_function_context. */
6475 current_function_decl = NULL;
6479 /* Generate the RTL for a deferred function FNDECL. */
6482 c_expand_deferred_function (fndecl)
6485 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6486 function was deferred, e.g. in duplicate_decls. */
6487 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6489 if (flag_inline_trees)
6491 timevar_push (TV_INTEGRATION);
6492 optimize_inline_calls (fndecl);
6493 timevar_pop (TV_INTEGRATION);
6495 c_expand_body (fndecl);
6496 current_function_decl = NULL;
6500 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6501 then we are already in the process of generating RTL for another
6502 function. If can_defer_p is zero, we won't attempt to defer the
6503 generation of RTL. */
6506 c_expand_body_1 (fndecl, nested_p)
6510 timevar_push (TV_EXPAND);
6514 /* Make sure that we will evaluate variable-sized types involved
6515 in our function's type. */
6516 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6517 /* Squirrel away our current state. */
6518 push_function_context ();
6521 /* Initialize the RTL code for the function. */
6522 current_function_decl = fndecl;
6523 input_filename = DECL_SOURCE_FILE (fndecl);
6524 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6526 /* This function is being processed in whole-function mode. */
6527 cfun->x_whole_function_mode_p = 1;
6529 /* Even though we're inside a function body, we still don't want to
6530 call expand_expr to calculate the size of a variable-sized array.
6531 We haven't necessarily assigned RTL to all variables yet, so it's
6532 not safe to try to expand expressions involving them. */
6533 immediate_size_expand = 0;
6534 cfun->x_dont_save_pending_sizes_p = 1;
6536 /* Set up parameters and prepare for return, for the function. */
6537 expand_function_start (fndecl, 0);
6539 /* If this function is `main', emit a call to `__main'
6540 to run global initializers, etc. */
6541 if (DECL_NAME (fndecl)
6542 && MAIN_NAME_P (DECL_NAME (fndecl))
6543 && DECL_CONTEXT (fndecl) == NULL_TREE)
6544 expand_main_function ();
6546 /* Generate the RTL for this function. */
6547 expand_stmt (DECL_SAVED_TREE (fndecl));
6549 /* We hard-wired immediate_size_expand to zero above.
6550 expand_function_end will decrement this variable. So, we set the
6551 variable to one here, so that after the decrement it will remain
6553 immediate_size_expand = 1;
6555 /* Allow language dialects to perform special processing. */
6556 if (lang_expand_function_end)
6557 (*lang_expand_function_end) ();
6559 /* Generate rtl for function exit. */
6560 expand_function_end (input_filename, lineno, 0);
6562 /* If this is a nested function, protect the local variables in the stack
6563 above us from being collected while we're compiling this function. */
6565 ggc_push_context ();
6567 /* Run the optimizers and output the assembler code for this function. */
6568 rest_of_compilation (fndecl);
6570 /* Undo the GC context switch. */
6574 /* With just -Wextra, complain only if function returns both with
6575 and without a value. */
6577 && current_function_returns_value
6578 && current_function_returns_null)
6579 warning ("this function may return with or without a value");
6581 /* If requested, warn about function definitions where the function will
6582 return a value (usually of some struct or union type) which itself will
6583 take up a lot of stack space. */
6585 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6587 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6589 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6590 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6591 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6594 unsigned int size_as_int
6595 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6597 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6598 warning_with_decl (fndecl,
6599 "size of return value of `%s' is %u bytes",
6602 warning_with_decl (fndecl,
6603 "size of return value of `%s' is larger than %d bytes",
6608 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6609 && ! flag_inline_trees)
6611 /* Stop pointing to the local nodes about to be freed.
6612 But DECL_INITIAL must remain nonzero so we know this
6613 was an actual function definition.
6614 For a nested function, this is done in c_pop_function_context.
6615 If rest_of_compilation set this to 0, leave it 0. */
6616 if (DECL_INITIAL (fndecl) != 0)
6617 DECL_INITIAL (fndecl) = error_mark_node;
6619 DECL_ARGUMENTS (fndecl) = 0;
6622 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6624 if (targetm.have_ctors_dtors)
6625 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6626 DEFAULT_INIT_PRIORITY);
6628 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6631 if (DECL_STATIC_DESTRUCTOR (fndecl))
6633 if (targetm.have_ctors_dtors)
6634 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6635 DEFAULT_INIT_PRIORITY);
6637 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6641 /* Return to the enclosing function. */
6642 pop_function_context ();
6643 timevar_pop (TV_EXPAND);
6646 /* Like c_expand_body_1 but only for unnested functions. */
6649 c_expand_body (fndecl)
6652 c_expand_body_1 (fndecl, 0);
6655 /* Check the declarations given in a for-loop for satisfying the C99
6658 check_for_loop_decls ()
6664 /* If we get here, declarations have been used in a for loop without
6665 the C99 for loop scope. This doesn't make much sense, so don't
6667 error ("`for' loop initial declaration used outside C99 mode");
6670 /* C99 subclause 6.8.5 paragraph 3:
6672 [#3] The declaration part of a for statement shall only
6673 declare identifiers for objects having storage class auto or
6676 It isn't clear whether, in this sentence, "identifiers" binds to
6677 "shall only declare" or to "objects" - that is, whether all identifiers
6678 declared must be identifiers for objects, or whether the restriction
6679 only applies to those that are. (A question on this in comp.std.c
6680 in November 2000 received no answer.) We implement the strictest
6681 interpretation, to avoid creating an extension which later causes
6684 for (t = gettags (); t; t = TREE_CHAIN (t))
6686 if (TREE_PURPOSE (t) != 0)
6688 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6690 if (code == RECORD_TYPE)
6691 error ("`struct %s' declared in `for' loop initial declaration",
6692 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6693 else if (code == UNION_TYPE)
6694 error ("`union %s' declared in `for' loop initial declaration",
6695 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6697 error ("`enum %s' declared in `for' loop initial declaration",
6698 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6702 for (t = getdecls (); t; t = TREE_CHAIN (t))
6704 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6705 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6706 else if (TREE_STATIC (t))
6707 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6708 else if (DECL_EXTERNAL (t))
6709 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6713 /* Save and restore the variables in this file and elsewhere
6714 that keep track of the progress of compilation of the current function.
6715 Used for nested functions. */
6717 struct language_function GTY(())
6719 struct c_language_function base;
6721 tree shadowed_labels;
6724 int returns_abnormally;
6725 int warn_about_return_type;
6727 struct binding_level *binding_level;
6730 /* Save and reinitialize the variables
6731 used during compilation of a C function. */
6734 c_push_function_context (f)
6737 struct language_function *p;
6738 p = ((struct language_function *)
6739 ggc_alloc (sizeof (struct language_function)));
6742 p->base.x_stmt_tree = c_stmt_tree;
6743 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6744 p->named_labels = named_labels;
6745 p->shadowed_labels = shadowed_labels;
6746 p->returns_value = current_function_returns_value;
6747 p->returns_null = current_function_returns_null;
6748 p->returns_abnormally = current_function_returns_abnormally;
6749 p->warn_about_return_type = warn_about_return_type;
6750 p->extern_inline = current_extern_inline;
6751 p->binding_level = current_binding_level;
6754 /* Restore the variables used during compilation of a C function. */
6757 c_pop_function_context (f)
6760 struct language_function *p = f->language;
6763 /* Bring back all the labels that were shadowed. */
6764 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6765 if (DECL_NAME (TREE_VALUE (link)) != 0)
6766 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6767 = TREE_VALUE (link);
6769 if (DECL_SAVED_INSNS (current_function_decl) == 0
6770 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6772 /* Stop pointing to the local nodes about to be freed. */
6773 /* But DECL_INITIAL must remain nonzero so we know this
6774 was an actual function definition. */
6775 DECL_INITIAL (current_function_decl) = error_mark_node;
6776 DECL_ARGUMENTS (current_function_decl) = 0;
6779 c_stmt_tree = p->base.x_stmt_tree;
6780 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6781 named_labels = p->named_labels;
6782 shadowed_labels = p->shadowed_labels;
6783 current_function_returns_value = p->returns_value;
6784 current_function_returns_null = p->returns_null;
6785 current_function_returns_abnormally = p->returns_abnormally;
6786 warn_about_return_type = p->warn_about_return_type;
6787 current_extern_inline = p->extern_inline;
6788 current_binding_level = p->binding_level;
6793 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6796 c_dup_lang_specific_decl (decl)
6799 struct lang_decl *ld;
6801 if (!DECL_LANG_SPECIFIC (decl))
6804 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
6805 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
6806 sizeof (struct lang_decl));
6807 DECL_LANG_SPECIFIC (decl) = ld;
6810 /* The functions below are required for functionality of doing
6811 function at once processing in the C front end. Currently these
6812 functions are not called from anywhere in the C front end, but as
6813 these changes continue, that will change. */
6815 /* Returns nonzero if the current statement is a full expression,
6816 i.e. temporaries created during that statement should be destroyed
6817 at the end of the statement. */
6820 stmts_are_full_exprs_p ()
6825 /* Returns the stmt_tree (if any) to which statements are currently
6826 being added. If there is no active statement-tree, NULL is
6830 current_stmt_tree ()
6832 return &c_stmt_tree;
6835 /* Returns the stack of SCOPE_STMTs for the current function. */
6838 current_scope_stmt_stack ()
6840 return &c_scope_stmt_stack;
6843 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6847 anon_aggr_type_p (node)
6848 tree node ATTRIBUTE_UNUSED;
6853 /* Dummy function in place of callback used by C++. */
6856 extract_interface_info ()
6860 /* Return a new COMPOUND_STMT, after adding it to the current
6864 c_begin_compound_stmt ()
6868 /* Create the COMPOUND_STMT. */
6869 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6874 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6878 c_expand_decl_stmt (t)
6881 tree decl = DECL_STMT_DECL (t);
6883 /* Expand nested functions. */
6884 if (TREE_CODE (decl) == FUNCTION_DECL
6885 && DECL_CONTEXT (decl) == current_function_decl
6886 && DECL_SAVED_TREE (decl))
6887 c_expand_body_1 (decl, 1);
6890 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
6891 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
6894 identifier_global_value (t)
6897 return IDENTIFIER_GLOBAL_VALUE (t);
6900 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6901 otherwise the name is found in ridpointers from RID_INDEX. */
6904 record_builtin_type (rid_index, name, type)
6911 id = ridpointers[(int) rid_index];
6913 id = get_identifier (name);
6914 pushdecl (build_decl (TYPE_DECL, id, type));
6917 /* Build the void_list_node (void_type_node having been created). */
6919 build_void_list_node ()
6921 tree t = build_tree_list (NULL_TREE, void_type_node);
6925 /* Return something to represent absolute declarators containing a *.
6926 TARGET is the absolute declarator that the * contains.
6927 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6928 to apply to the pointer type, represented as identifiers, possible mixed
6931 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6932 if attributes are present) and whose type is the modifier list. */
6935 make_pointer_declarator (type_quals_attrs, target)
6936 tree type_quals_attrs, target;
6939 tree itarget = target;
6940 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6941 if (attrs != NULL_TREE)
6942 itarget = tree_cons (attrs, target, NULL_TREE);
6943 return build1 (INDIRECT_REF, quals, itarget);
6946 #include "gt-c-decl.h"