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. */
33 #include "tree-inline.h"
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
52 { NORMAL, /* Ordinary declaration */
53 FUNCDEF, /* Function definition */
54 PARM, /* Declaration of parm before function body */
55 FIELD, /* Declaration inside struct or union */
56 BITFIELD, /* Likewise but with specified width */
57 TYPENAME}; /* Typename (inside cast or sizeof) */
60 /* Nonzero if we have seen an invalid cross reference
61 to a struct, union, or enum, but not yet printed the message. */
63 tree pending_invalid_xref;
64 /* File and line to appear in the eventual error message. */
65 const char *pending_invalid_xref_file;
66 int pending_invalid_xref_line;
68 /* While defining an enum type, this is 1 plus the last enumerator
69 constant value. Note that will do not have to save this or `enum_overflow'
70 around nested function definition since such a definition could only
71 occur in an enum value expression and we don't use these variables in
74 static tree enum_next_value;
76 /* Nonzero means that there was overflow computing enum_next_value. */
78 static int enum_overflow;
80 /* Parsing a function declarator leaves a list of parameter names
81 or a chain or parameter decls here. */
83 static tree last_function_parms;
85 /* Parsing a function declarator leaves here a chain of structure
86 and enum types declared in the parmlist. */
88 static tree last_function_parm_tags;
90 /* After parsing the declarator that starts a function definition,
91 `start_function' puts here the list of parameter names or chain of decls.
92 `store_parm_decls' finds it here. */
94 static tree current_function_parms;
96 /* Similar, for last_function_parm_tags. */
97 static tree current_function_parm_tags;
99 /* Similar, for the file and line that the prototype came from if this is
100 an old-style definition. */
101 static const char *current_function_prototype_file;
102 static int current_function_prototype_line;
104 /* The current statement tree. */
106 static GTY(()) struct stmt_tree_s c_stmt_tree;
108 /* The current scope statement stack. */
110 static GTY(()) tree c_scope_stmt_stack;
112 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
113 that have names. Here so we can clear out their names' definitions
114 at the end of the function. */
116 static GTY(()) tree named_labels;
118 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
120 static GTY(()) tree shadowed_labels;
122 /* Set to 0 at beginning of a function definition, set to 1 if
123 a return statement that specifies a return value is seen. */
125 int current_function_returns_value;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement with no argument is seen. */
130 int current_function_returns_null;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a call to a noreturn function is seen. */
135 int current_function_returns_abnormally;
137 /* Set to nonzero by `grokdeclarator' for a function
138 whose return type is defaulted, if warnings for this are desired. */
140 static int warn_about_return_type;
142 /* Nonzero when starting a function declared `extern inline'. */
144 static int current_extern_inline;
146 /* For each binding contour we allocate a binding_level structure
147 * which records the names defined in that contour.
150 * 1) one for each function definition,
151 * where internal declarations of the parameters appear.
152 * 2) one for each compound statement,
153 * to record its declarations.
155 * The current meaning of a name can be found by searching the levels from
156 * the current one out to the global one.
159 /* Note that the information in the `names' component of the global contour
160 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
162 struct binding_level GTY(())
164 /* A chain of _DECL nodes for all variables, constants, functions,
165 and typedef types. These are in the reverse of the order supplied.
169 /* A list of structure, union and enum definitions,
170 * for looking up tag names.
171 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
172 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
173 * or ENUMERAL_TYPE node.
177 /* For each level, a list of shadowed outer-level local definitions
178 to be restored when this level is popped.
179 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
180 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
183 /* For each level (except not the global one),
184 a chain of BLOCK nodes for all the levels
185 that were entered and exited one level down. */
188 /* The BLOCK node for this level, if one has been preallocated.
189 If 0, the BLOCK is allocated (if needed) when the level is popped. */
192 /* The binding level which this one is contained in (inherits from). */
193 struct binding_level *level_chain;
195 /* Nonzero for the level that holds the parameters of a function. */
198 /* Nonzero if this level "doesn't exist" for tags. */
199 char tag_transparent;
201 /* Nonzero if sublevels of this level "don't exist" for tags.
202 This is set in the parm level of a function definition
203 while reading the function body, so that the outermost block
204 of the function body will be tag-transparent. */
205 char subblocks_tag_transparent;
207 /* Nonzero means make a BLOCK for this level regardless of all else. */
210 /* Nonzero means make a BLOCK if this level has any subblocks. */
211 char keep_if_subblocks;
213 /* List of decls in `names' that have incomplete structure or
215 tree incomplete_list;
217 /* A list of decls giving the (reversed) specified order of parms,
218 not including any forward-decls in the parmlist.
219 This is so we can put the parms in proper order for assign_parms. */
223 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
225 /* The binding level currently in effect. */
227 static GTY(()) struct binding_level *current_binding_level;
229 /* A chain of binding_level structures awaiting reuse. */
231 static GTY((deletable (""))) struct binding_level *free_binding_level;
233 /* The outermost binding level, for names of file scope.
234 This is created when the compiler is started and exists
235 through the entire run. */
237 static GTY(()) struct binding_level *global_binding_level;
239 /* Binding level structures are initialized by copying this one. */
241 static struct binding_level clear_binding_level
242 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, NULL,
245 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
247 static int keep_next_level_flag;
249 /* Nonzero means make a BLOCK for the next level pushed
250 if it has subblocks. */
252 static int keep_next_if_subblocks;
254 /* The chain of outer levels of label scopes.
255 This uses the same data structure used for binding levels,
256 but it works differently: each link in the chain records
257 saved values of named_labels and shadowed_labels for
258 a label binding level outside the current one. */
260 static GTY(()) struct binding_level *label_level_chain;
262 /* Functions called automatically at the beginning and end of execution. */
264 tree static_ctors, static_dtors;
266 /* Forward declarations. */
268 static struct binding_level * make_binding_level PARAMS ((void));
269 static void pop_binding_level PARAMS ((struct binding_level **));
270 static void clear_limbo_values PARAMS ((tree));
271 static int duplicate_decls PARAMS ((tree, tree, int));
272 static int redeclaration_error_message PARAMS ((tree, tree));
273 static void storedecls PARAMS ((tree));
274 static void storetags PARAMS ((tree));
275 static tree lookup_tag PARAMS ((enum tree_code, tree,
276 struct binding_level *, int));
277 static tree lookup_tag_reverse PARAMS ((tree));
278 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
280 static tree grokparms PARAMS ((tree, int));
281 static void layout_array_type PARAMS ((tree));
282 static tree c_make_fname_decl PARAMS ((tree, int));
283 static void c_expand_body PARAMS ((tree, int, int));
284 static void warn_if_shadowing PARAMS ((tree, tree));
285 static bool flexible_array_type_p PARAMS ((tree));
287 /* States indicating how grokdeclarator() should handle declspecs marked
288 with __attribute__((deprecated)). An object declared as
289 __attribute__((deprecated)) suppresses warnings of uses of other
292 enum deprecated_states {
297 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
300 c_print_identifier (file, node, indent)
305 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
306 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
307 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
308 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
309 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
310 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
311 if (C_IS_RESERVED_WORD (node))
313 tree rid = ridpointers[C_RID_CODE (node)];
314 indent_to (file, indent + 4);
315 fprintf (file, "rid ");
316 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
317 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
321 /* Hook called at end of compilation to assume 1 elt
322 for a top-level tentative array defn that wasn't complete before. */
325 c_finish_incomplete_decl (decl)
328 if (TREE_CODE (decl) == VAR_DECL)
330 tree type = TREE_TYPE (decl);
331 if (type != error_mark_node
332 && TREE_CODE (type) == ARRAY_TYPE
333 && ! DECL_EXTERNAL (decl)
334 && TYPE_DOMAIN (type) == 0)
336 warning_with_decl (decl, "array `%s' assumed to have one element");
338 complete_array_type (type, NULL_TREE, 1);
340 layout_decl (decl, 0);
345 /* Reuse or create a struct for this binding level. */
347 static struct binding_level *
348 make_binding_level ()
350 if (free_binding_level)
352 struct binding_level *result = free_binding_level;
353 free_binding_level = result->level_chain;
357 return (struct binding_level *) ggc_alloc (sizeof (struct binding_level));
360 /* Remove a binding level from a list and add it to the level chain. */
363 pop_binding_level (lp)
364 struct binding_level **lp;
366 struct binding_level *l = *lp;
367 *lp = l->level_chain;
369 memset (l, 0, sizeof (struct binding_level));
370 l->level_chain = free_binding_level;
371 free_binding_level = l;
374 /* Nonzero if we are currently in the global binding level. */
379 return current_binding_level == global_binding_level;
385 keep_next_level_flag = 1;
388 /* Nonzero if the current level needs to have a BLOCK made. */
393 return ((current_binding_level->keep_if_subblocks
394 && current_binding_level->blocks != 0)
395 || current_binding_level->keep
396 || current_binding_level->names != 0
397 || (current_binding_level->tags != 0
398 && !current_binding_level->tag_transparent));
401 /* Identify this binding level as a level of parameters.
402 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
403 But it turns out there is no way to pass the right value for
404 DEFINITION_FLAG, so we ignore it. */
407 declare_parm_level (definition_flag)
408 int definition_flag ATTRIBUTE_UNUSED;
410 current_binding_level->parm_flag = 1;
413 /* Nonzero if currently making parm declarations. */
418 return current_binding_level->parm_flag;
421 /* Enter a new binding level.
422 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
423 not for that of tags. */
426 pushlevel (tag_transparent)
429 struct binding_level *newlevel = NULL_BINDING_LEVEL;
431 /* If this is the top level of a function,
432 just make sure that NAMED_LABELS is 0. */
434 if (current_binding_level == global_binding_level)
439 newlevel = make_binding_level ();
441 /* Add this level to the front of the chain (stack) of levels that
444 *newlevel = clear_binding_level;
445 newlevel->tag_transparent
447 || (current_binding_level
448 ? current_binding_level->subblocks_tag_transparent
450 newlevel->level_chain = current_binding_level;
451 current_binding_level = newlevel;
452 newlevel->keep = keep_next_level_flag;
453 keep_next_level_flag = 0;
454 newlevel->keep_if_subblocks = keep_next_if_subblocks;
455 keep_next_if_subblocks = 0;
458 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
461 clear_limbo_values (block)
466 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
467 if (DECL_NAME (tem) != 0)
468 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
470 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
471 clear_limbo_values (tem);
474 /* Exit a binding level.
475 Pop the level off, and restore the state of the identifier-decl mappings
476 that were in effect when this level was entered.
478 If KEEP is nonzero, this level had explicit declarations, so
479 and create a "block" (a BLOCK node) for the level
480 to record its declarations and subblocks for symbol table output.
482 If FUNCTIONBODY is nonzero, this level is the body of a function,
483 so create a block as if KEEP were set and also clear out all
486 If REVERSE is nonzero, reverse the order of decls before putting
487 them into the BLOCK. */
490 poplevel (keep, reverse, functionbody)
496 /* The chain of decls was accumulated in reverse order.
497 Put it into forward order, just for cleanliness. */
499 tree tags = current_binding_level->tags;
500 tree subblocks = current_binding_level->blocks;
503 int block_previously_created;
505 keep |= current_binding_level->keep;
507 /* This warning is turned off because it causes warnings for
508 declarations like `extern struct foo *x'. */
510 /* Warn about incomplete structure types in this level. */
511 for (link = tags; link; link = TREE_CHAIN (link))
512 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
514 tree type = TREE_VALUE (link);
515 tree type_name = TYPE_NAME (type);
516 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
518 : DECL_NAME (type_name));
519 switch (TREE_CODE (type))
522 error ("`struct %s' incomplete in scope ending here", id);
525 error ("`union %s' incomplete in scope ending here", id);
528 error ("`enum %s' incomplete in scope ending here", id);
534 /* Get the decls in the order they were written.
535 Usually current_binding_level->names is in reverse order.
536 But parameter decls were previously put in forward order. */
539 current_binding_level->names
540 = decls = nreverse (current_binding_level->names);
542 decls = current_binding_level->names;
544 /* Output any nested inline functions within this block
545 if they weren't already output. */
547 for (decl = decls; decl; decl = TREE_CHAIN (decl))
548 if (TREE_CODE (decl) == FUNCTION_DECL
549 && ! TREE_ASM_WRITTEN (decl)
550 && DECL_INITIAL (decl) != 0
551 && TREE_ADDRESSABLE (decl))
553 /* If this decl was copied from a file-scope decl
554 on account of a block-scope extern decl,
555 propagate TREE_ADDRESSABLE to the file-scope decl.
557 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
558 true, since then the decl goes through save_for_inline_copying. */
559 if (DECL_ABSTRACT_ORIGIN (decl) != 0
560 && DECL_ABSTRACT_ORIGIN (decl) != decl)
561 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
564 /* We used to warn about unused variables in expand_end_bindings,
565 i.e. while generating RTL. But in function-at-a-time mode we may
566 choose to never expand a function at all (e.g. auto inlining), so
567 we do this explicitly now. */
568 warn_about_unused_variables (getdecls ());
570 /* If there were any declarations or structure tags in that level,
571 or if this level is a function body,
572 create a BLOCK to record them for the life of this function. */
575 block_previously_created = (current_binding_level->this_block != 0);
576 if (block_previously_created)
577 block = current_binding_level->this_block;
578 else if (keep || functionbody
579 || (current_binding_level->keep_if_subblocks && subblocks != 0))
580 block = make_node (BLOCK);
583 BLOCK_VARS (block) = decls;
584 BLOCK_SUBBLOCKS (block) = subblocks;
587 /* In each subblock, record that this is its superior. */
589 for (link = subblocks; link; link = TREE_CHAIN (link))
590 BLOCK_SUPERCONTEXT (link) = block;
592 /* Clear out the meanings of the local variables of this level. */
594 for (link = decls; link; link = TREE_CHAIN (link))
596 if (DECL_NAME (link) != 0)
598 /* If the ident. was used or addressed via a local extern decl,
599 don't forget that fact. */
600 if (DECL_EXTERNAL (link))
602 if (TREE_USED (link))
603 TREE_USED (DECL_NAME (link)) = 1;
604 if (TREE_ADDRESSABLE (link))
605 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
607 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
611 /* Restore all name-meanings of the outer levels
612 that were shadowed by this level. */
614 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
615 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
617 /* If the level being exited is the top level of a function,
618 check over all the labels, and clear out the current
619 (function local) meanings of their names. */
623 clear_limbo_values (block);
625 /* If this is the top level block of a function,
626 the vars are the function's parameters.
627 Don't leave them in the BLOCK because they are
628 found in the FUNCTION_DECL instead. */
630 BLOCK_VARS (block) = 0;
632 /* Clear out the definitions of all label names,
633 since their scopes end here,
634 and add them to BLOCK_VARS. */
636 for (link = named_labels; link; link = TREE_CHAIN (link))
638 tree label = TREE_VALUE (link);
640 if (DECL_INITIAL (label) == 0)
642 error_with_decl (label, "label `%s' used but not defined");
643 /* Avoid crashing later. */
644 define_label (input_filename, lineno,
647 else if (warn_unused_label && !TREE_USED (label))
648 warning_with_decl (label, "label `%s' defined but not used");
649 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
651 /* Put the labels into the "variables" of the
652 top-level block, so debugger can see them. */
653 TREE_CHAIN (label) = BLOCK_VARS (block);
654 BLOCK_VARS (block) = label;
658 /* Pop the current level, and free the structure for reuse. */
660 pop_binding_level (¤t_binding_level);
662 /* Dispose of the block that we just made inside some higher level. */
664 DECL_INITIAL (current_function_decl) = block;
667 if (!block_previously_created)
668 current_binding_level->blocks
669 = chainon (current_binding_level->blocks, block);
671 /* If we did not make a block for the level just exited,
672 any blocks made for inner levels
673 (since they cannot be recorded as subblocks in that level)
674 must be carried forward so they will later become subblocks
675 of something else. */
677 current_binding_level->blocks
678 = chainon (current_binding_level->blocks, subblocks);
680 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
681 binding contour so that they point to the appropriate construct, i.e.
682 either to the current FUNCTION_DECL node, or else to the BLOCK node
685 Note that for tagged types whose scope is just the formal parameter
686 list for some function type specification, we can't properly set
687 their TYPE_CONTEXTs here, because we don't have a pointer to the
688 appropriate FUNCTION_TYPE node readily available to us. For those
689 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
690 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
691 node which will represent the "scope" for these "parameter list local"
695 for (link = tags; link; link = TREE_CHAIN (link))
696 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
698 for (link = tags; link; link = TREE_CHAIN (link))
699 TYPE_CONTEXT (TREE_VALUE (link)) = block;
702 TREE_USED (block) = 1;
707 /* Insert BLOCK at the end of the list of subblocks of the
708 current binding level. This is used when a BIND_EXPR is expanded,
709 to handle the BLOCK node inside the BIND_EXPR. */
715 TREE_USED (block) = 1;
716 current_binding_level->blocks
717 = chainon (current_binding_level->blocks, block);
720 /* Set the BLOCK node for the innermost scope
721 (the one we are currently in). */
727 current_binding_level->this_block = block;
728 current_binding_level->names = chainon (current_binding_level->names,
730 current_binding_level->blocks = chainon (current_binding_level->blocks,
731 BLOCK_SUBBLOCKS (block));
737 struct binding_level *newlevel;
739 newlevel = make_binding_level ();
741 /* Add this level to the front of the chain (stack) of label levels. */
743 newlevel->level_chain = label_level_chain;
744 label_level_chain = newlevel;
746 newlevel->names = named_labels;
747 newlevel->shadowed = shadowed_labels;
755 struct binding_level *level = label_level_chain;
758 /* Clear out the definitions of the declared labels in this level.
759 Leave in the list any ordinary, non-declared labels. */
760 for (link = named_labels, prev = 0; link;)
762 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
764 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
766 error_with_decl (TREE_VALUE (link),
767 "label `%s' used but not defined");
768 /* Avoid crashing later. */
769 define_label (input_filename, lineno,
770 DECL_NAME (TREE_VALUE (link)));
772 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
773 warning_with_decl (TREE_VALUE (link),
774 "label `%s' defined but not used");
775 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
777 /* Delete this element from the list. */
778 link = TREE_CHAIN (link);
780 TREE_CHAIN (prev) = link;
787 link = TREE_CHAIN (link);
791 /* Bring back all the labels that were shadowed. */
792 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
793 if (DECL_NAME (TREE_VALUE (link)) != 0)
794 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
797 named_labels = chainon (named_labels, level->names);
798 shadowed_labels = level->shadowed;
800 /* Pop the current level, and free the structure for reuse. */
801 pop_binding_level (&label_level_chain);
804 /* Push a definition or a declaration of struct, union or enum tag "name".
805 "type" should be the type node.
806 We assume that the tag "name" is not already defined.
808 Note that the definition may really be just a forward reference.
809 In that case, the TYPE_SIZE will be zero. */
815 struct binding_level *b;
817 /* Find the proper binding level for this type tag. */
819 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
824 /* Record the identifier as the type's name if it has none. */
826 if (TYPE_NAME (type) == 0)
827 TYPE_NAME (type) = name;
830 b->tags = tree_cons (name, type, b->tags);
832 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
833 tagged type we just added to the current binding level. This fake
834 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
835 to output a representation of a tagged type, and it also gives
836 us a convenient place to record the "scope start" address for the
839 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
841 /* An approximation for now, so we can tell this is a function-scope tag.
842 This will be updated in poplevel. */
843 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
846 /* Handle when a new declaration NEWDECL
847 has the same name as an old one OLDDECL
848 in the same binding contour.
849 Prints an error message if appropriate.
851 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
854 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
855 and OLDDECL is in an outer binding level and should thus not be changed. */
858 duplicate_decls (newdecl, olddecl, different_binding_level)
859 tree newdecl, olddecl;
860 int different_binding_level;
862 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
863 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
864 && DECL_INITIAL (newdecl) != 0);
865 tree oldtype = TREE_TYPE (olddecl);
866 tree newtype = TREE_TYPE (newdecl);
869 if (DECL_P (olddecl))
871 if (TREE_CODE (newdecl) == FUNCTION_DECL
872 && TREE_CODE (olddecl) == FUNCTION_DECL
873 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
875 if (DECL_DECLARED_INLINE_P (newdecl)
876 && DECL_UNINLINABLE (newdecl)
877 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
878 /* Already warned elsewhere. */;
879 else if (DECL_DECLARED_INLINE_P (olddecl)
880 && DECL_UNINLINABLE (olddecl)
881 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
882 /* Already warned. */;
883 else if (DECL_DECLARED_INLINE_P (newdecl)
884 && ! DECL_DECLARED_INLINE_P (olddecl)
885 && DECL_UNINLINABLE (olddecl)
886 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
888 warning_with_decl (newdecl,
889 "function `%s' redeclared as inline");
890 warning_with_decl (olddecl,
891 "previous declaration of function `%s' with attribute noinline");
893 else if (DECL_DECLARED_INLINE_P (olddecl)
894 && DECL_UNINLINABLE (newdecl)
895 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
897 warning_with_decl (newdecl,
898 "function `%s' redeclared with attribute noinline");
899 warning_with_decl (olddecl,
900 "previous declaration of function `%s' was inline");
904 DECL_ATTRIBUTES (newdecl)
905 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
908 if (TREE_CODE (newtype) == ERROR_MARK
909 || TREE_CODE (oldtype) == ERROR_MARK)
912 /* New decl is completely inconsistent with the old one =>
913 tell caller to replace the old one.
914 This is always an error except in the case of shadowing a builtin. */
915 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
917 if (TREE_CODE (olddecl) == FUNCTION_DECL
918 && (DECL_BUILT_IN (olddecl)
919 || DECL_BUILT_IN_NONANSI (olddecl)))
921 /* If you declare a built-in or predefined function name as static,
922 the old definition is overridden,
923 but optionally warn this was a bad choice of name. */
924 if (!TREE_PUBLIC (newdecl))
928 else if (DECL_BUILT_IN (olddecl))
929 warning_with_decl (newdecl, "shadowing built-in function `%s'");
931 warning_with_decl (newdecl, "shadowing library function `%s'");
933 /* Likewise, if the built-in is not ansi, then programs can
934 override it even globally without an error. */
935 else if (! DECL_BUILT_IN (olddecl))
936 warning_with_decl (newdecl,
937 "library function `%s' declared as non-function");
939 else if (DECL_BUILT_IN_NONANSI (olddecl))
940 warning_with_decl (newdecl,
941 "built-in function `%s' declared as non-function");
943 warning_with_decl (newdecl,
944 "built-in function `%s' declared as non-function");
948 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
949 error_with_decl (olddecl, "previous declaration of `%s'");
955 /* For real parm decl following a forward decl,
956 return 1 so old decl will be reused. */
957 if (types_match && TREE_CODE (newdecl) == PARM_DECL
958 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
961 /* The new declaration is the same kind of object as the old one.
962 The declarations may partially match. Print warnings if they don't
963 match enough. Ultimately, copy most of the information from the new
964 decl to the old one, and keep using the old one. */
966 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
968 /* A function declaration for a built-in function. */
969 if (!TREE_PUBLIC (newdecl))
971 /* If you declare a built-in function name as static, the
972 built-in definition is overridden,
973 but optionally warn this was a bad choice of name. */
975 warning_with_decl (newdecl, "shadowing built-in function `%s'");
976 /* Discard the old built-in function. */
979 else if (!types_match)
981 /* Accept the return type of the new declaration if same modes. */
982 tree oldreturntype = TREE_TYPE (oldtype);
983 tree newreturntype = TREE_TYPE (newtype);
985 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
987 /* Function types may be shared, so we can't just modify
988 the return type of olddecl's function type. */
990 = build_function_type (newreturntype,
991 TYPE_ARG_TYPES (oldtype));
992 trytype = build_type_attribute_variant (trytype,
993 TYPE_ATTRIBUTES (oldtype));
995 types_match = comptypes (newtype, trytype);
999 /* Accept harmless mismatch in first argument type also.
1000 This is for the ffs and fprintf builtins. */
1001 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1002 && TYPE_ARG_TYPES (oldtype) != 0
1003 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1004 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1005 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1006 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1008 /* Function types may be shared, so we can't just modify
1009 the return type of olddecl's function type. */
1011 = build_function_type (TREE_TYPE (oldtype),
1012 tree_cons (NULL_TREE,
1013 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1014 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1015 trytype = build_type_attribute_variant (trytype,
1016 TYPE_ATTRIBUTES (oldtype));
1018 types_match = comptypes (newtype, trytype);
1022 if (! different_binding_level)
1023 TREE_TYPE (olddecl) = oldtype;
1025 else if (TYPE_ARG_TYPES (oldtype) == NULL
1026 && TYPE_ARG_TYPES (newtype) != NULL)
1028 /* For bcmp, bzero, fputs the builtin type has arguments not
1029 specified. Use the ones from the prototype so that type checking
1030 is done for them. */
1032 = build_function_type (TREE_TYPE (oldtype),
1033 TYPE_ARG_TYPES (newtype));
1034 trytype = build_type_attribute_variant (trytype,
1035 TYPE_ATTRIBUTES (oldtype));
1038 if (! different_binding_level)
1039 TREE_TYPE (olddecl) = oldtype;
1043 /* If types don't match for a built-in, throw away the built-in. */
1044 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1048 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1049 && DECL_SOURCE_LINE (olddecl) == 0)
1051 /* A function declaration for a predeclared function
1052 that isn't actually built in. */
1053 if (!TREE_PUBLIC (newdecl))
1055 /* If you declare it as static, the
1056 default definition is overridden. */
1059 else if (!types_match)
1061 /* If the types don't match, preserve volatility indication.
1062 Later on, we will discard everything else about the
1063 default declaration. */
1064 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1067 /* Permit char *foo () to match void *foo (...) if not pedantic,
1068 if one of them came from a system header file. */
1069 else if (!types_match
1070 && TREE_CODE (olddecl) == FUNCTION_DECL
1071 && TREE_CODE (newdecl) == FUNCTION_DECL
1072 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1073 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1074 && (DECL_IN_SYSTEM_HEADER (olddecl)
1075 || DECL_IN_SYSTEM_HEADER (newdecl))
1076 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1077 && TYPE_ARG_TYPES (oldtype) == 0
1078 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1079 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1081 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1082 && TYPE_ARG_TYPES (newtype) == 0
1083 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1084 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1087 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1088 /* Make sure we keep void * as ret type, not char *. */
1089 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1090 TREE_TYPE (newdecl) = newtype = oldtype;
1092 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1093 we will come back here again. */
1094 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1096 else if (!types_match
1097 /* Permit char *foo (int, ...); followed by char *foo ();
1099 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1101 /* Return types must still match. */
1102 && comptypes (TREE_TYPE (oldtype),
1103 TREE_TYPE (newtype))
1104 && TYPE_ARG_TYPES (newtype) == 0))
1106 error_with_decl (newdecl, "conflicting types for `%s'");
1107 /* Check for function type mismatch
1108 involving an empty arglist vs a nonempty one. */
1109 if (TREE_CODE (olddecl) == FUNCTION_DECL
1110 && comptypes (TREE_TYPE (oldtype),
1111 TREE_TYPE (newtype))
1112 && ((TYPE_ARG_TYPES (oldtype) == 0
1113 && DECL_INITIAL (olddecl) == 0)
1115 (TYPE_ARG_TYPES (newtype) == 0
1116 && DECL_INITIAL (newdecl) == 0)))
1118 /* Classify the problem further. */
1119 tree t = TYPE_ARG_TYPES (oldtype);
1121 t = TYPE_ARG_TYPES (newtype);
1122 for (; t; t = TREE_CHAIN (t))
1124 tree type = TREE_VALUE (t);
1126 if (TREE_CHAIN (t) == 0
1127 && TYPE_MAIN_VARIANT (type) != void_type_node)
1129 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1133 if (c_type_promotes_to (type) != type)
1135 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1140 error_with_decl (olddecl, "previous declaration of `%s'");
1142 /* TLS cannot follow non-TLS declaration. */
1143 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1144 && !DECL_THREAD_LOCAL (olddecl) && DECL_THREAD_LOCAL (newdecl))
1146 error_with_decl (newdecl, "thread-local declaration of `%s' follows non thread-local declaration");
1147 error_with_decl (olddecl, "previous declaration of `%s'");
1149 /* non-TLS declaration cannot follow TLS declaration. */
1150 else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
1151 && DECL_THREAD_LOCAL (olddecl) && !DECL_THREAD_LOCAL (newdecl))
1153 error_with_decl (newdecl, "non thread-local declaration of `%s' follows thread-local declaration");
1154 error_with_decl (olddecl, "previous declaration of `%s'");
1158 errmsg = redeclaration_error_message (newdecl, olddecl);
1164 error_with_decl (newdecl, "redefinition of `%s'");
1167 error_with_decl (newdecl, "redeclaration of `%s'");
1170 error_with_decl (newdecl, "conflicting declarations of `%s'");
1176 error_with_decl (olddecl,
1177 ((DECL_INITIAL (olddecl)
1178 && current_binding_level == global_binding_level)
1179 ? "`%s' previously defined here"
1180 : "`%s' previously declared here"));
1183 else if (TREE_CODE (newdecl) == TYPE_DECL
1184 && (DECL_IN_SYSTEM_HEADER (olddecl)
1185 || DECL_IN_SYSTEM_HEADER (newdecl)))
1187 warning_with_decl (newdecl, "redefinition of `%s'");
1190 ((DECL_INITIAL (olddecl)
1191 && current_binding_level == global_binding_level)
1192 ? "`%s' previously defined here"
1193 : "`%s' previously declared here"));
1195 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1196 && DECL_INITIAL (olddecl) != 0
1197 && TYPE_ARG_TYPES (oldtype) == 0
1198 && TYPE_ARG_TYPES (newtype) != 0
1199 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1203 /* Prototype decl follows defn w/o prototype. */
1205 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1206 type = TYPE_ARG_TYPES (newtype),
1209 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1211 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1212 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1214 warning_with_decl (newdecl, "prototype for `%s' follows");
1215 warning_with_decl (olddecl, "non-prototype definition here");
1218 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1219 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1221 error_with_decl (newdecl,
1222 "prototype for `%s' follows and number of arguments doesn't match");
1223 error_with_decl (olddecl, "non-prototype definition here");
1227 /* Type for passing arg must be consistent
1228 with that declared for the arg. */
1229 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)))
1231 error_with_decl (newdecl,
1232 "prototype for `%s' follows and argument %d doesn't match",
1234 error_with_decl (olddecl, "non-prototype definition here");
1240 /* Warn about mismatches in various flags. */
1243 /* Warn if function is now inline
1244 but was previously declared not inline and has been called. */
1245 if (TREE_CODE (olddecl) == FUNCTION_DECL
1246 && ! DECL_DECLARED_INLINE_P (olddecl)
1247 && DECL_DECLARED_INLINE_P (newdecl)
1248 && TREE_USED (olddecl))
1249 warning_with_decl (newdecl,
1250 "`%s' declared inline after being called");
1251 if (TREE_CODE (olddecl) == FUNCTION_DECL
1252 && ! DECL_DECLARED_INLINE_P (olddecl)
1253 && DECL_DECLARED_INLINE_P (newdecl)
1254 && DECL_INITIAL (olddecl) != 0)
1255 warning_with_decl (newdecl,
1256 "`%s' declared inline after its definition");
1258 /* If pedantic, warn when static declaration follows a non-static
1259 declaration. Otherwise, do so only for functions. */
1260 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1261 && TREE_PUBLIC (olddecl)
1262 && !TREE_PUBLIC (newdecl))
1263 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1265 /* If warn_traditional, warn when a non-static function
1266 declaration follows a static one. */
1267 if (warn_traditional && !in_system_header
1268 && TREE_CODE (olddecl) == FUNCTION_DECL
1269 && !TREE_PUBLIC (olddecl)
1270 && TREE_PUBLIC (newdecl))
1271 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1273 /* Warn when const declaration follows a non-const
1274 declaration, but not for functions. */
1275 if (TREE_CODE (olddecl) != FUNCTION_DECL
1276 && !TREE_READONLY (olddecl)
1277 && TREE_READONLY (newdecl))
1278 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1279 /* These bits are logically part of the type, for variables.
1280 But not for functions
1281 (where qualifiers are not valid ANSI anyway). */
1282 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1283 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1284 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1285 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1289 /* Optionally warn about more than one declaration for the same name. */
1290 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1291 /* Don't warn about a function declaration
1292 followed by a definition. */
1293 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1294 && DECL_INITIAL (olddecl) == 0)
1295 /* Don't warn about extern decl followed by (tentative) definition. */
1296 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1298 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1299 warning_with_decl (olddecl, "previous declaration of `%s'");
1302 /* Copy all the DECL_... slots specified in the new decl
1303 except for any that we copy here from the old type.
1305 Past this point, we don't change OLDTYPE and NEWTYPE
1306 even if we change the types of NEWDECL and OLDDECL. */
1310 /* When copying info to olddecl, we store into write_olddecl
1311 instead. This allows us to avoid modifying olddecl when
1312 different_binding_level is true. */
1313 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1315 /* Merge the data types specified in the two decls. */
1316 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1318 if (different_binding_level)
1320 if (TYPE_ARG_TYPES (oldtype) != 0
1321 && TYPE_ARG_TYPES (newtype) == 0)
1322 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1325 = build_type_attribute_variant
1327 merge_attributes (TYPE_ATTRIBUTES (newtype),
1328 TYPE_ATTRIBUTES (oldtype)));
1332 = TREE_TYPE (olddecl)
1333 = common_type (newtype, oldtype);
1336 /* Lay the type out, unless already done. */
1337 if (oldtype != TREE_TYPE (newdecl))
1339 if (TREE_TYPE (newdecl) != error_mark_node)
1340 layout_type (TREE_TYPE (newdecl));
1341 if (TREE_CODE (newdecl) != FUNCTION_DECL
1342 && TREE_CODE (newdecl) != TYPE_DECL
1343 && TREE_CODE (newdecl) != CONST_DECL)
1344 layout_decl (newdecl, 0);
1348 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1349 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1350 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1351 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1352 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1353 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1355 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1356 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1360 /* Keep the old rtl since we can safely use it. */
1361 COPY_DECL_RTL (olddecl, newdecl);
1363 /* Merge the type qualifiers. */
1364 if (TREE_READONLY (newdecl))
1365 TREE_READONLY (write_olddecl) = 1;
1367 if (TREE_THIS_VOLATILE (newdecl))
1369 TREE_THIS_VOLATILE (write_olddecl) = 1;
1370 if (TREE_CODE (newdecl) == VAR_DECL
1371 /* If an automatic variable is re-declared in the same
1372 function scope, but the old declaration was not
1373 volatile, make_var_volatile() would crash because the
1374 variable would have been assigned to a pseudo, not a
1375 MEM. Since this duplicate declaration is invalid
1376 anyway, we just skip the call. */
1378 make_var_volatile (newdecl);
1381 /* Keep source location of definition rather than declaration. */
1382 /* When called with different_binding_level set, keep the old
1383 information so that meaningful diagnostics can be given. */
1384 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1385 && ! different_binding_level)
1387 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1388 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1391 /* Merge the unused-warning information. */
1392 if (DECL_IN_SYSTEM_HEADER (olddecl))
1393 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1394 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1395 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1397 /* Merge the initialization information. */
1398 /* When called with different_binding_level set, don't copy over
1399 DECL_INITIAL, so that we don't accidentally change function
1400 declarations into function definitions. */
1401 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1402 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1404 /* Merge the section attribute.
1405 We want to issue an error if the sections conflict but that must be
1406 done later in decl_attributes since we are called before attributes
1408 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1409 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1411 /* Copy the assembler name.
1412 Currently, it can only be defined in the prototype. */
1413 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1415 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1417 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1418 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1419 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1420 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1421 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1424 /* If cannot merge, then use the new type and qualifiers,
1425 and don't preserve the old rtl. */
1426 else if (! different_binding_level)
1428 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1429 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1430 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1431 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1434 /* Merge the storage class information. */
1435 merge_weak (newdecl, olddecl);
1437 /* For functions, static overrides non-static. */
1438 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1440 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1441 /* This is since we don't automatically
1442 copy the attributes of NEWDECL into OLDDECL. */
1443 /* No need to worry about different_binding_level here because
1444 then TREE_PUBLIC (newdecl) was true. */
1445 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1446 /* If this clears `static', clear it in the identifier too. */
1447 if (! TREE_PUBLIC (olddecl))
1448 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1450 if (DECL_EXTERNAL (newdecl))
1452 if (! different_binding_level)
1454 /* Don't mess with these flags on local externs; they remain
1455 external even if there's a declaration at file scope which
1457 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1458 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1460 /* An extern decl does not override previous storage class. */
1461 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1462 if (! DECL_EXTERNAL (newdecl))
1463 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1467 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1468 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1471 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1473 /* If we're redefining a function previously defined as extern
1474 inline, make sure we emit debug info for the inline before we
1475 throw it away, in case it was inlined into a function that hasn't
1476 been written out yet. */
1477 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1479 (*debug_hooks->outlining_inline_function) (olddecl);
1481 /* The new defn must not be inline. */
1482 DECL_INLINE (newdecl) = 0;
1483 DECL_UNINLINABLE (newdecl) = 1;
1487 /* If either decl says `inline', this fn is inline,
1488 unless its definition was passed already. */
1489 if (DECL_DECLARED_INLINE_P (newdecl)
1490 || DECL_DECLARED_INLINE_P (olddecl))
1491 DECL_DECLARED_INLINE_P (newdecl) = 1;
1493 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1494 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1497 if (DECL_BUILT_IN (olddecl))
1499 /* Get rid of any built-in function if new arg types don't match it
1500 or if we have a function definition. */
1501 if (! types_match || new_is_definition)
1503 if (! different_binding_level)
1505 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1506 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1511 /* If redeclaring a builtin function, and not a definition,
1512 it stays built in. */
1513 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1514 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1518 /* Also preserve various other info from the definition. */
1519 if (! new_is_definition)
1521 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1522 /* When called with different_binding_level set, don't copy over
1523 DECL_INITIAL, so that we don't accidentally change function
1524 declarations into function definitions. */
1525 if (! different_binding_level)
1526 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1527 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1528 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1529 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
1530 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1532 /* Set DECL_INLINE on the declaration if we've got a body
1533 from which to instantiate. */
1534 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1536 DECL_INLINE (newdecl) = 1;
1537 DECL_ABSTRACT_ORIGIN (newdecl)
1538 = (different_binding_level
1539 ? DECL_ORIGIN (olddecl)
1540 : DECL_ABSTRACT_ORIGIN (olddecl));
1545 /* If a previous declaration said inline, mark the
1546 definition as inlinable. */
1547 if (DECL_DECLARED_INLINE_P (newdecl)
1548 && ! DECL_UNINLINABLE (newdecl))
1549 DECL_INLINE (newdecl) = 1;
1552 if (different_binding_level)
1555 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1556 But preserve OLDDECL's DECL_UID. */
1558 unsigned olddecl_uid = DECL_UID (olddecl);
1560 memcpy ((char *) olddecl + sizeof (struct tree_common),
1561 (char *) newdecl + sizeof (struct tree_common),
1562 sizeof (struct tree_decl) - sizeof (struct tree_common));
1563 DECL_UID (olddecl) = olddecl_uid;
1566 /* NEWDECL contains the merged attribute lists.
1567 Update OLDDECL to be the same. */
1568 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1573 /* Check whether decl-node X shadows an existing declaration.
1574 OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
1575 which might be a NULL_TREE. */
1577 warn_if_shadowing (x, oldlocal)
1582 if (DECL_EXTERNAL (x))
1585 name = DECL_NAME (x);
1587 /* Warn if shadowing an argument at the top level of the body. */
1589 /* This warning doesn't apply to the parms of a nested fcn. */
1590 && ! current_binding_level->parm_flag
1591 /* Check that this is one level down from the parms. */
1592 && current_binding_level->level_chain->parm_flag
1593 /* Check that the decl being shadowed
1594 comes from the parm level, one level up. */
1595 && chain_member (oldlocal, current_binding_level->level_chain->names))
1597 if (TREE_CODE (oldlocal) == PARM_DECL)
1598 pedwarn ("declaration of `%s' shadows a parameter",
1599 IDENTIFIER_POINTER (name));
1601 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
1602 IDENTIFIER_POINTER (name));
1604 /* Maybe warn if shadowing something else. */
1605 else if (warn_shadow
1606 /* No shadow warnings for internally generated vars. */
1607 && DECL_SOURCE_LINE (x) != 0
1608 /* No shadow warnings for vars made for inlining. */
1609 && ! DECL_FROM_INLINE (x))
1611 if (TREE_CODE (x) == PARM_DECL
1612 && current_binding_level->level_chain->parm_flag)
1613 /* Don't warn about the parm names in function declarator
1614 within a function declarator.
1615 It would be nice to avoid warning in any function
1616 declarator in a declaration, as opposed to a definition,
1617 but there is no way to tell it's not a definition. */
1621 if (TREE_CODE (oldlocal) == PARM_DECL)
1622 shadow_warning ("a parameter", name, oldlocal);
1624 shadow_warning ("a previous local", name, oldlocal);
1626 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
1627 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
1628 shadow_warning ("a global declaration", name,
1629 IDENTIFIER_GLOBAL_VALUE (name));
1633 /* Record a decl-node X as belonging to the current lexical scope.
1634 Check for errors (such as an incompatible declaration for the same
1635 name already seen in the same scope).
1637 Returns either X or an old decl for the same name.
1638 If an old decl is returned, it may have been smashed
1639 to agree with what X says. */
1646 tree name = DECL_NAME (x);
1647 struct binding_level *b = current_binding_level;
1649 /* Functions need the lang_decl data. */
1650 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1651 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
1652 ggc_alloc_cleared (sizeof (struct lang_decl));
1654 DECL_CONTEXT (x) = current_function_decl;
1655 /* A local extern declaration for a function doesn't constitute nesting.
1656 A local auto declaration does, since it's a forward decl
1657 for a nested function coming later. */
1658 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1659 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
1660 DECL_CONTEXT (x) = 0;
1664 int different_binding_level = 0;
1666 if (warn_nested_externs
1667 && DECL_EXTERNAL (x)
1668 && b != global_binding_level
1669 && x != IDENTIFIER_IMPLICIT_DECL (name)
1670 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
1671 && !DECL_IN_SYSTEM_HEADER (x))
1672 warning ("nested extern declaration of `%s'",
1673 IDENTIFIER_POINTER (name));
1675 t = lookup_name_current_level (name);
1676 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
1678 t = IDENTIFIER_GLOBAL_VALUE (name);
1679 /* Type decls at global scope don't conflict with externs declared
1680 inside lexical blocks. */
1681 if (! t || TREE_CODE (t) == TYPE_DECL)
1682 /* If there's no visible global declaration, try for an
1684 t = IDENTIFIER_LIMBO_VALUE (name);
1685 different_binding_level = 1;
1687 if (t != 0 && t == error_mark_node)
1688 /* error_mark_node is 0 for a while during initialization! */
1691 error_with_decl (x, "`%s' used prior to declaration");
1694 /* If this decl is `static' and an implicit decl was seen previously,
1696 if (TREE_PUBLIC (name)
1697 /* Don't test for DECL_EXTERNAL, because grokdeclarator
1698 sets this for all functions. */
1699 && ! TREE_PUBLIC (x)
1700 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
1701 /* We used to warn also for explicit extern followed by static,
1702 but sometimes you need to do it that way. */
1703 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
1705 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1706 IDENTIFIER_POINTER (name));
1707 pedwarn_with_file_and_line
1708 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
1709 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
1710 "previous declaration of `%s'",
1711 IDENTIFIER_POINTER (name));
1712 TREE_THIS_VOLATILE (name) = 1;
1715 if (t != 0 && duplicate_decls (x, t, different_binding_level))
1717 if (TREE_CODE (t) == PARM_DECL)
1719 /* Don't allow more than one "real" duplicate
1720 of a forward parm decl. */
1721 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
1727 /* If we are processing a typedef statement, generate a whole new
1728 ..._TYPE node (which will be just an variant of the existing
1729 ..._TYPE node with identical properties) and then install the
1730 TYPE_DECL node generated to represent the typedef name as the
1731 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1733 The whole point here is to end up with a situation where each
1734 and every ..._TYPE node the compiler creates will be uniquely
1735 associated with AT MOST one node representing a typedef name.
1736 This way, even though the compiler substitutes corresponding
1737 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1738 early on, later parts of the compiler can always do the reverse
1739 translation and get back the corresponding typedef name. For
1742 typedef struct S MY_TYPE;
1745 Later parts of the compiler might only know that `object' was of
1746 type `struct S' if it were not for code just below. With this
1747 code however, later parts of the compiler see something like:
1749 struct S' == struct S
1750 typedef struct S' MY_TYPE;
1753 And they can then deduce (from the node for type struct S') that
1754 the original object declaration was:
1758 Being able to do this is important for proper support of protoize,
1759 and also for generating precise symbolic debugging information
1760 which takes full account of the programmer's (typedef) vocabulary.
1762 Obviously, we don't want to generate a duplicate ..._TYPE node if
1763 the TYPE_DECL node that we are now processing really represents a
1764 standard built-in type.
1766 Since all standard types are effectively declared at line zero
1767 in the source file, we can easily check to see if we are working
1768 on a standard type by checking the current value of lineno. */
1770 if (TREE_CODE (x) == TYPE_DECL)
1772 if (DECL_SOURCE_LINE (x) == 0)
1774 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1775 TYPE_NAME (TREE_TYPE (x)) = x;
1777 else if (TREE_TYPE (x) != error_mark_node
1778 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1780 tree tt = TREE_TYPE (x);
1781 DECL_ORIGINAL_TYPE (x) = tt;
1782 tt = build_type_copy (tt);
1784 TREE_USED (tt) = TREE_USED (x);
1789 /* Multiple external decls of the same identifier ought to match.
1790 We get warnings about inline functions where they are defined.
1791 Avoid duplicate warnings where they are used. */
1793 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
1797 if (IDENTIFIER_LIMBO_VALUE (name) != 0)
1798 /* Decls in limbo are always extern, so no need to check that. */
1799 decl = IDENTIFIER_LIMBO_VALUE (name);
1803 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
1804 /* If old decl is built-in, we already warned if we should. */
1805 && !DECL_BUILT_IN (decl))
1807 pedwarn_with_decl (x,
1808 "type mismatch with previous external decl");
1809 pedwarn_with_decl (decl, "previous external decl of `%s'");
1813 /* If a function has had an implicit declaration, and then is defined,
1814 make sure they are compatible. */
1816 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1817 && IDENTIFIER_GLOBAL_VALUE (name) == 0
1818 && TREE_CODE (x) == FUNCTION_DECL
1819 && ! comptypes (TREE_TYPE (x),
1820 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
1822 warning_with_decl (x, "type mismatch with previous implicit declaration");
1823 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
1824 "previous implicit declaration of `%s'");
1827 /* This name is new in its binding level.
1828 Install the new declaration and return it. */
1829 if (b == global_binding_level)
1831 /* Install a global value. */
1833 /* If the first global decl has external linkage,
1834 warn if we later see static one. */
1835 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
1836 TREE_PUBLIC (name) = 1;
1838 IDENTIFIER_GLOBAL_VALUE (name) = x;
1840 /* We no longer care about any previous block level declarations. */
1841 IDENTIFIER_LIMBO_VALUE (name) = 0;
1843 /* Don't forget if the function was used via an implicit decl. */
1844 if (IDENTIFIER_IMPLICIT_DECL (name)
1845 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
1846 TREE_USED (x) = 1, TREE_USED (name) = 1;
1848 /* Don't forget if its address was taken in that way. */
1849 if (IDENTIFIER_IMPLICIT_DECL (name)
1850 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
1851 TREE_ADDRESSABLE (x) = 1;
1853 /* Warn about mismatches against previous implicit decl. */
1854 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1855 /* If this real decl matches the implicit, don't complain. */
1856 && ! (TREE_CODE (x) == FUNCTION_DECL
1857 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
1858 == integer_type_node)))
1859 pedwarn ("`%s' was previously implicitly declared to return `int'",
1860 IDENTIFIER_POINTER (name));
1862 /* If this decl is `static' and an `extern' was seen previously,
1863 that is erroneous. */
1864 if (TREE_PUBLIC (name)
1865 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
1867 /* Okay to redeclare an ANSI built-in as static. */
1868 if (t != 0 && DECL_BUILT_IN (t))
1870 /* Okay to declare a non-ANSI built-in as anything. */
1871 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
1873 /* Okay to have global type decl after an earlier extern
1874 declaration inside a lexical block. */
1875 else if (TREE_CODE (x) == TYPE_DECL)
1877 else if (IDENTIFIER_IMPLICIT_DECL (name))
1879 if (! TREE_THIS_VOLATILE (name))
1880 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1881 IDENTIFIER_POINTER (name));
1884 pedwarn ("`%s' was declared `extern' and later `static'",
1885 IDENTIFIER_POINTER (name));
1890 /* Here to install a non-global value. */
1891 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
1892 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
1894 IDENTIFIER_LOCAL_VALUE (name) = x;
1896 /* If this is an extern function declaration, see if we
1897 have a global definition or declaration for the function. */
1900 && TREE_CODE (x) == FUNCTION_DECL
1901 && TREE_CODE (oldglobal) == FUNCTION_DECL
1902 && DECL_EXTERNAL (x)
1903 && ! DECL_DECLARED_INLINE_P (x))
1905 /* We have one. Their types must agree. */
1906 if (! comptypes (TREE_TYPE (x),
1907 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
1908 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
1911 /* Inner extern decl is inline if global one is.
1912 Copy enough to really inline it. */
1913 if (DECL_DECLARED_INLINE_P (oldglobal))
1915 DECL_DECLARED_INLINE_P (x)
1916 = DECL_DECLARED_INLINE_P (oldglobal);
1917 DECL_INLINE (x) = DECL_INLINE (oldglobal);
1918 DECL_INITIAL (x) = (current_function_decl == oldglobal
1919 ? 0 : DECL_INITIAL (oldglobal));
1920 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
1921 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
1922 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
1923 DECL_RESULT (x) = DECL_RESULT (oldglobal);
1924 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
1925 DECL_ABSTRACT_ORIGIN (x)
1926 = DECL_ABSTRACT_ORIGIN (oldglobal);
1928 /* Inner extern decl is built-in if global one is. */
1929 if (DECL_BUILT_IN (oldglobal))
1931 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
1932 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
1934 /* Keep the arg types from a file-scope fcn defn. */
1935 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
1936 && DECL_INITIAL (oldglobal)
1937 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
1938 TREE_TYPE (x) = TREE_TYPE (oldglobal);
1943 /* This case is probably sometimes the right thing to do. */
1944 /* If we have a local external declaration,
1945 then any file-scope declaration should not
1946 have been static. */
1947 if (oldlocal == 0 && oldglobal != 0
1948 && !TREE_PUBLIC (oldglobal)
1949 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
1950 warning ("`%s' locally external but globally static",
1951 IDENTIFIER_POINTER (name));
1954 /* If we have a local external declaration,
1955 and no file-scope declaration has yet been seen,
1956 then if we later have a file-scope decl it must not be static. */
1958 && DECL_EXTERNAL (x)
1962 TREE_PUBLIC (name) = 1;
1964 /* Save this decl, so that we can do type checking against
1965 other decls after it falls out of scope.
1967 Only save it once. This prevents temporary decls created in
1968 expand_inline_function from being used here, since this
1969 will have been set when the inline function was parsed.
1970 It also helps give slightly better warnings. */
1971 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
1972 IDENTIFIER_LIMBO_VALUE (name) = x;
1975 warn_if_shadowing (x, oldlocal);
1977 /* If storing a local value, there may already be one (inherited).
1978 If so, record it for restoration when this binding level ends. */
1980 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
1983 /* Keep list of variables in this level with incomplete type.
1984 If the input is erroneous, we can have error_mark in the type
1985 slot (e.g. "f(void a, ...)") - that doesn't count as an
1987 if (TREE_TYPE (x) != error_mark_node
1988 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1990 tree element = TREE_TYPE (x);
1992 while (TREE_CODE (element) == ARRAY_TYPE)
1993 element = TREE_TYPE (element);
1994 if (TREE_CODE (element) == RECORD_TYPE
1995 || TREE_CODE (element) == UNION_TYPE)
1996 b->incomplete_list = tree_cons (NULL_TREE, x, b->incomplete_list);
2000 /* Put decls on list in reverse order.
2001 We will reverse them later if necessary. */
2002 TREE_CHAIN (x) = b->names;
2008 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2011 pushdecl_top_level (x)
2015 struct binding_level *b = current_binding_level;
2017 current_binding_level = global_binding_level;
2019 current_binding_level = b;
2023 /* Generate an implicit declaration for identifier FUNCTIONID
2024 as a function of type int (). Print a warning if appropriate. */
2027 implicitly_declare (functionid)
2031 int traditional_warning = 0;
2032 /* Only one "implicit declaration" warning per identifier. */
2033 int implicit_warning;
2035 /* We used to reuse an old implicit decl here,
2036 but this loses with inline functions because it can clobber
2037 the saved decl chains. */
2039 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2040 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2043 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2045 /* Warn of implicit decl following explicit local extern decl.
2046 This is probably a program designed for traditional C. */
2047 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2048 traditional_warning = 1;
2050 /* Warn once of an implicit declaration. */
2051 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2053 DECL_EXTERNAL (decl) = 1;
2054 TREE_PUBLIC (decl) = 1;
2056 /* Record that we have an implicit decl and this is it. */
2057 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2059 /* ANSI standard says implicit declarations are in the innermost block.
2060 So we record the decl in the standard fashion. */
2063 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2065 objc_check_decl (decl);
2067 rest_of_decl_compilation (decl, NULL, 0, 0);
2069 if (implicit_warning)
2070 implicit_decl_warning (functionid);
2071 else if (warn_traditional && traditional_warning)
2072 warning ("function `%s' was previously declared within a block",
2073 IDENTIFIER_POINTER (functionid));
2075 /* Write a record describing this implicit function declaration to the
2076 prototypes file (if requested). */
2078 gen_aux_info_record (decl, 0, 1, 0);
2080 /* Possibly apply some default attributes to this implicit declaration. */
2081 decl_attributes (&decl, NULL_TREE, 0);
2087 implicit_decl_warning (id)
2090 const char *name = IDENTIFIER_POINTER (id);
2091 if (mesg_implicit_function_declaration == 2)
2092 error ("implicit declaration of function `%s'", name);
2093 else if (mesg_implicit_function_declaration == 1)
2094 warning ("implicit declaration of function `%s'", name);
2097 /* Return zero if the declaration NEWDECL is valid
2098 when the declaration OLDDECL (assumed to be for the same name)
2099 has already been seen.
2100 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2101 and 3 if it is a conflicting declaration. */
2104 redeclaration_error_message (newdecl, olddecl)
2105 tree newdecl, olddecl;
2107 if (TREE_CODE (newdecl) == TYPE_DECL)
2109 /* Do not complain about type redeclarations where at least one
2110 declaration was in a system header. */
2111 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2115 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2117 /* Declarations of functions can insist on internal linkage
2118 but they can't be inconsistent with internal linkage,
2119 so there can be no error on that account.
2120 However defining the same name twice is no good. */
2121 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2122 /* However, defining once as extern inline and a second
2123 time in another way is ok. */
2124 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2125 && ! (DECL_DECLARED_INLINE_P (newdecl)
2126 && DECL_EXTERNAL (newdecl))))
2130 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2132 /* Objects declared at top level: */
2133 /* If at least one is a reference, it's ok. */
2134 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2136 /* Reject two definitions. */
2137 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2139 /* Now we have two tentative defs, or one tentative and one real def. */
2140 /* Insist that the linkage match. */
2141 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2145 else if (current_binding_level->parm_flag
2146 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2150 /* Newdecl has block scope. If olddecl has block scope also, then
2151 reject two definitions, and reject a definition together with an
2152 external reference. Otherwise, it is OK, because newdecl must
2153 be an extern reference to olddecl. */
2154 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2155 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2161 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2162 Create one if none exists so far for the current function.
2163 This function is called for both label definitions and label references. */
2169 tree decl = IDENTIFIER_LABEL_VALUE (id);
2171 if (current_function_decl == 0)
2173 error ("label %s referenced outside of any function",
2174 IDENTIFIER_POINTER (id));
2178 /* Use a label already defined or ref'd with this name. */
2181 /* But not if it is inherited and wasn't declared to be inheritable. */
2182 if (DECL_CONTEXT (decl) != current_function_decl
2183 && ! C_DECLARED_LABEL_FLAG (decl))
2184 return shadow_label (id);
2188 decl = build_decl (LABEL_DECL, id, void_type_node);
2190 /* A label not explicitly declared must be local to where it's ref'd. */
2191 DECL_CONTEXT (decl) = current_function_decl;
2193 DECL_MODE (decl) = VOIDmode;
2195 /* Say where one reference is to the label,
2196 for the sake of the error if it is not defined. */
2197 DECL_SOURCE_LINE (decl) = lineno;
2198 DECL_SOURCE_FILE (decl) = input_filename;
2200 IDENTIFIER_LABEL_VALUE (id) = decl;
2202 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2207 /* Make a label named NAME in the current function,
2208 shadowing silently any that may be inherited from containing functions
2209 or containing scopes.
2211 Note that valid use, if the label being shadowed
2212 comes from another scope in the same function,
2213 requires calling declare_nonlocal_label right away. */
2219 tree decl = IDENTIFIER_LABEL_VALUE (name);
2225 /* Check to make sure that the label hasn't already been declared
2226 at this label scope */
2227 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2228 if (TREE_VALUE (dup) == decl)
2230 error ("duplicate label declaration `%s'",
2231 IDENTIFIER_POINTER (name));
2232 error_with_decl (TREE_VALUE (dup),
2233 "this is a previous declaration");
2234 /* Just use the previous declaration. */
2235 return lookup_label (name);
2238 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2239 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2242 return lookup_label (name);
2245 /* Define a label, specifying the location in the source file.
2246 Return the LABEL_DECL node for the label, if the definition is valid.
2247 Otherwise return 0. */
2250 define_label (filename, line, name)
2251 const char *filename;
2255 tree decl = lookup_label (name);
2257 /* If label with this name is known from an outer context, shadow it. */
2258 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2260 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2261 IDENTIFIER_LABEL_VALUE (name) = 0;
2262 decl = lookup_label (name);
2265 if (warn_traditional && !in_system_header && lookup_name (name))
2266 warning_with_file_and_line (filename, line,
2267 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2268 IDENTIFIER_POINTER (name));
2270 if (DECL_INITIAL (decl) != 0)
2272 error_with_file_and_line (filename, line, "duplicate label `%s'",
2273 IDENTIFIER_POINTER (name));
2278 /* Mark label as having been defined. */
2279 DECL_INITIAL (decl) = error_mark_node;
2280 /* Say where in the source. */
2281 DECL_SOURCE_FILE (decl) = filename;
2282 DECL_SOURCE_LINE (decl) = line;
2287 /* Return the list of declarations of the current level.
2288 Note that this list is in reverse order unless/until
2289 you nreverse it; and when you do nreverse it, you must
2290 store the result back using `storedecls' or you will lose. */
2295 return current_binding_level->names;
2298 /* Return the list of type-tags (for structs, etc) of the current level. */
2303 return current_binding_level->tags;
2306 /* Store the list of declarations of the current level.
2307 This is done for the parameter declarations of a function being defined,
2308 after they are modified in the light of any missing parameters. */
2314 current_binding_level->names = decls;
2317 /* Similarly, store the list of tags of the current level. */
2323 current_binding_level->tags = tags;
2326 /* Given NAME, an IDENTIFIER_NODE,
2327 return the structure (or union or enum) definition for that name.
2328 Searches binding levels from BINDING_LEVEL up to the global level.
2329 If THISLEVEL_ONLY is nonzero, searches only the specified context
2330 (but skips any tag-transparent contexts to find one that is
2331 meaningful for tags).
2332 CODE says which kind of type the caller wants;
2333 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2334 If the wrong kind of type is found, an error is reported. */
2337 lookup_tag (code, name, binding_level, thislevel_only)
2338 enum tree_code code;
2339 struct binding_level *binding_level;
2343 struct binding_level *level;
2346 for (level = binding_level; level; level = level->level_chain)
2349 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2351 if (TREE_PURPOSE (tail) == name)
2353 if (TREE_CODE (TREE_VALUE (tail)) != code)
2355 /* Definition isn't the kind we were looking for. */
2356 pending_invalid_xref = name;
2357 pending_invalid_xref_file = input_filename;
2358 pending_invalid_xref_line = lineno;
2359 /* If in the same binding level as a declaration as a tag
2360 of a different type, this must not be allowed to
2361 shadow that tag, so give the error immediately.
2362 (For example, "struct foo; union foo;" is invalid.) */
2364 pending_xref_error ();
2366 return TREE_VALUE (tail);
2369 if (! level->tag_transparent)
2379 /* Print an error message now
2380 for a recent invalid struct, union or enum cross reference.
2381 We don't print them immediately because they are not invalid
2382 when used in the `struct foo;' construct for shadowing. */
2385 pending_xref_error ()
2387 if (pending_invalid_xref != 0)
2388 error_with_file_and_line (pending_invalid_xref_file,
2389 pending_invalid_xref_line,
2390 "`%s' defined as wrong kind of tag",
2391 IDENTIFIER_POINTER (pending_invalid_xref));
2392 pending_invalid_xref = 0;
2395 /* Given a type, find the tag that was defined for it and return the tag name.
2396 Otherwise return 0. */
2399 lookup_tag_reverse (type)
2402 struct binding_level *level;
2404 for (level = current_binding_level; level; level = level->level_chain)
2407 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2409 if (TREE_VALUE (tail) == type)
2410 return TREE_PURPOSE (tail);
2416 /* Look up NAME in the current binding level and its superiors
2417 in the namespace of variables, functions and typedefs.
2418 Return a ..._DECL node of some kind representing its definition,
2419 or return 0 if it is undefined. */
2427 if (current_binding_level != global_binding_level
2428 && IDENTIFIER_LOCAL_VALUE (name))
2429 val = IDENTIFIER_LOCAL_VALUE (name);
2431 val = IDENTIFIER_GLOBAL_VALUE (name);
2435 /* Similar to `lookup_name' but look only at current binding level. */
2438 lookup_name_current_level (name)
2443 if (current_binding_level == global_binding_level)
2444 return IDENTIFIER_GLOBAL_VALUE (name);
2446 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2449 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2450 if (DECL_NAME (t) == name)
2456 /* Create the predefined scalar types of C,
2457 and some nodes representing standard constants (0, 1, (void *) 0).
2458 Initialize the global binding level.
2459 Make definitions for built-in primitive functions. */
2462 c_init_decl_processing ()
2465 tree ptr_ftype_void, ptr_ftype_ptr;
2467 /* Adds some ggc roots, and reserved words for c-parse.in. */
2470 current_function_decl = NULL;
2471 named_labels = NULL;
2472 current_binding_level = NULL_BINDING_LEVEL;
2473 free_binding_level = NULL_BINDING_LEVEL;
2475 /* Make the binding_level structure for global names. */
2477 global_binding_level = current_binding_level;
2479 build_common_tree_nodes (flag_signed_char);
2481 c_common_nodes_and_builtins ();
2483 boolean_type_node = integer_type_node;
2484 boolean_true_node = integer_one_node;
2485 boolean_false_node = integer_zero_node;
2487 c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
2488 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2489 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2490 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2491 TYPE_PRECISION (c_bool_type_node) = 1;
2492 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2494 c_bool_false_node = build_int_2 (0, 0);
2495 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2496 c_bool_true_node = build_int_2 (1, 0);
2497 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2499 endlink = void_list_node;
2500 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2502 = build_function_type (ptr_type_node,
2503 tree_cons (NULL_TREE, ptr_type_node, endlink));
2505 pedantic_lvalues = pedantic;
2507 make_fname_decl = c_make_fname_decl;
2508 start_fname_decls ();
2511 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2512 decl, NAME is the initialization string and TYPE_DEP indicates whether
2513 NAME depended on the type of the function. As we don't yet implement
2514 delayed emission of static data, we mark the decl as emitted
2515 so it is not placed in the output. Anything using it must therefore pull
2516 out the STRING_CST initializer directly. This does mean that these names
2517 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2520 c_make_fname_decl (id, type_dep)
2524 const char *name = fname_as_string (type_dep);
2525 tree decl, type, init;
2526 size_t length = strlen (name);
2528 type = build_array_type
2529 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2530 build_index_type (size_int (length)));
2532 decl = build_decl (VAR_DECL, id, type);
2533 /* We don't push the decl, so have to set its context here. */
2534 DECL_CONTEXT (decl) = current_function_decl;
2536 TREE_STATIC (decl) = 1;
2537 TREE_READONLY (decl) = 1;
2538 DECL_ARTIFICIAL (decl) = 1;
2540 init = build_string (length + 1, name);
2541 TREE_TYPE (init) = type;
2542 DECL_INITIAL (decl) = init;
2544 TREE_USED (decl) = 1;
2546 finish_decl (decl, init, NULL_TREE);
2551 /* Return a definition for a builtin function named NAME and whose data type
2552 is TYPE. TYPE should be a function type with argument types.
2553 FUNCTION_CODE tells later passes how to compile calls to this function.
2554 See tree.h for its possible values.
2556 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2557 the name to be called if we can't opencode the function. If
2558 ATTRS is nonzero, use that for the function's attribute list. */
2561 builtin_function (name, type, function_code, class, library_name, attrs)
2565 enum built_in_class class;
2566 const char *library_name;
2569 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2570 DECL_EXTERNAL (decl) = 1;
2571 TREE_PUBLIC (decl) = 1;
2573 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2574 make_decl_rtl (decl, NULL);
2576 DECL_BUILT_IN_CLASS (decl) = class;
2577 DECL_FUNCTION_CODE (decl) = function_code;
2579 /* Warn if a function in the namespace for users
2580 is used without an occasion to consider it declared. */
2581 if (name[0] != '_' || name[1] != '_')
2582 C_DECL_ANTICIPATED (decl) = 1;
2584 /* Possibly apply some default attributes to this built-in function. */
2586 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2588 decl_attributes (&decl, NULL_TREE, 0);
2593 /* Apply default attributes to a function, if a system function with default
2597 c_insert_default_attributes (decl)
2600 if (!TREE_PUBLIC (decl))
2602 c_common_insert_default_attributes (decl);
2605 /* Called when a declaration is seen that contains no names to declare.
2606 If its type is a reference to a structure, union or enum inherited
2607 from a containing scope, shadow that tag name for the current scope
2608 with a forward reference.
2609 If its type defines a new named structure or union
2610 or defines an enum, it is valid but we need not do anything here.
2611 Otherwise, it is an error. */
2614 shadow_tag (declspecs)
2617 shadow_tag_warned (declspecs, 0);
2621 shadow_tag_warned (declspecs, warned)
2624 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2631 pending_invalid_xref = 0;
2633 /* Remove the attributes from declspecs, since they will confuse the
2635 split_specs_attrs (declspecs, &specs, &attrs);
2637 for (link = specs; link; link = TREE_CHAIN (link))
2639 tree value = TREE_VALUE (link);
2640 enum tree_code code = TREE_CODE (value);
2642 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2643 /* Used to test also that TYPE_SIZE (value) != 0.
2644 That caused warning for `struct foo;' at top level in the file. */
2646 tree name = lookup_tag_reverse (value);
2653 if (warned != 1 && code != ENUMERAL_TYPE)
2654 /* Empty unnamed enum OK */
2656 pedwarn ("unnamed struct/union that defines no instances");
2662 t = lookup_tag (code, name, current_binding_level, 1);
2666 t = make_node (code);
2673 if (!warned && ! in_system_header)
2675 warning ("useless keyword or type name in empty declaration");
2682 error ("two types specified in one empty declaration");
2687 pedwarn ("empty declaration");
2691 /* Construct an array declarator. EXPR is the expression inside [], or
2692 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2693 to the pointer to which a parameter array is converted). STATIC_P is
2694 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2695 is nonzero is the array is [*], a VLA of unspecified length which is
2696 nevertheless a complete type (not currently implemented by GCC),
2697 zero otherwise. The declarator is constructed as an ARRAY_REF
2698 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2699 left of the [] (filled by in set_array_declarator_type) and operand 1
2700 is the expression inside; whose TREE_TYPE is the type qualifiers and
2701 which has TREE_STATIC set if "static" is used. */
2704 build_array_declarator (expr, quals, static_p, vla_unspec_p)
2711 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2712 TREE_TYPE (decl) = quals;
2713 TREE_STATIC (decl) = (static_p ? 1 : 0);
2714 if (pedantic && !flag_isoc99)
2716 if (static_p || quals != NULL_TREE)
2717 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2719 pedwarn ("ISO C90 does not support `[*]' array declarators");
2722 warning ("GCC does not yet properly implement `[*]' array declarators");
2726 /* Set the type of an array declarator. DECL is the declarator, as
2727 constructed by build_array_declarator; TYPE is what appears on the left
2728 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2729 abstract declarator, zero otherwise; this is used to reject static and
2730 type qualifiers in abstract declarators, where they are not in the
2734 set_array_declarator_type (decl, type, abstract_p)
2739 TREE_OPERAND (decl, 0) = type;
2740 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2741 error ("static or type qualifiers in abstract declarator");
2745 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2748 groktypename (typename)
2753 if (TREE_CODE (typename) != TREE_LIST)
2756 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2758 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
2760 /* Apply attributes. */
2761 decl_attributes (&typename, attrs, 0);
2766 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2769 groktypename_in_parm_context (typename)
2772 if (TREE_CODE (typename) != TREE_LIST)
2774 return grokdeclarator (TREE_VALUE (typename),
2775 TREE_PURPOSE (typename),
2779 /* Decode a declarator in an ordinary declaration or data definition.
2780 This is called as soon as the type information and variable name
2781 have been parsed, before parsing the initializer if any.
2782 Here we create the ..._DECL node, fill in its type,
2783 and put it on the list of decls for the current context.
2784 The ..._DECL node is returned as the value.
2786 Exception: for arrays where the length is not specified,
2787 the type is left null, to be filled in by `finish_decl'.
2789 Function definitions do not come here; they go to start_function
2790 instead. However, external and forward declarations of functions
2791 do go through here. Structure field declarations are done by
2792 grokfield and not through here. */
2795 start_decl (declarator, declspecs, initialized, attributes)
2796 tree declarator, declspecs;
2803 /* An object declared as __attribute__((deprecated)) suppresses
2804 warnings of uses of other deprecated items. */
2805 if (lookup_attribute ("deprecated", attributes))
2806 deprecated_state = DEPRECATED_SUPPRESS;
2808 decl = grokdeclarator (declarator, declspecs,
2809 NORMAL, initialized);
2811 deprecated_state = DEPRECATED_NORMAL;
2813 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2814 && MAIN_NAME_P (DECL_NAME (decl)))
2815 warning_with_decl (decl, "`%s' is usually a function");
2818 /* Is it valid for this decl to have an initializer at all?
2819 If not, set INITIALIZED to zero, which will indirectly
2820 tell `finish_decl' to ignore the initializer once it is parsed. */
2821 switch (TREE_CODE (decl))
2824 error ("typedef `%s' is initialized (use __typeof__ instead)",
2825 IDENTIFIER_POINTER (DECL_NAME (decl)));
2830 error ("function `%s' is initialized like a variable",
2831 IDENTIFIER_POINTER (DECL_NAME (decl)));
2836 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2837 error ("parameter `%s' is initialized",
2838 IDENTIFIER_POINTER (DECL_NAME (decl)));
2843 /* Don't allow initializations for incomplete types
2844 except for arrays which might be completed by the initialization. */
2846 /* This can happen if the array size is an undefined macro. We already
2847 gave a warning, so we don't need another one. */
2848 if (TREE_TYPE (decl) == error_mark_node)
2850 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2852 /* A complete type is ok if size is fixed. */
2854 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2855 || C_DECL_VARIABLE_SIZE (decl))
2857 error ("variable-sized object may not be initialized");
2861 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2863 error ("variable `%s' has initializer but incomplete type",
2864 IDENTIFIER_POINTER (DECL_NAME (decl)));
2867 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2869 error ("elements of array `%s' have incomplete type",
2870 IDENTIFIER_POINTER (DECL_NAME (decl)));
2878 /* Seems redundant with grokdeclarator. */
2879 if (current_binding_level != global_binding_level
2880 && DECL_EXTERNAL (decl)
2881 && TREE_CODE (decl) != FUNCTION_DECL)
2882 warning ("declaration of `%s' has `extern' and is initialized",
2883 IDENTIFIER_POINTER (DECL_NAME (decl)));
2885 DECL_EXTERNAL (decl) = 0;
2886 if (current_binding_level == global_binding_level)
2887 TREE_STATIC (decl) = 1;
2889 /* Tell `pushdecl' this is an initialized decl
2890 even though we don't yet have the initializer expression.
2891 Also tell `finish_decl' it may store the real initializer. */
2892 DECL_INITIAL (decl) = error_mark_node;
2895 /* If this is a function declaration, write a record describing it to the
2896 prototypes file (if requested). */
2898 if (TREE_CODE (decl) == FUNCTION_DECL)
2899 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2901 /* ANSI specifies that a tentative definition which is not merged with
2902 a non-tentative definition behaves exactly like a definition with an
2903 initializer equal to zero. (Section 3.7.2)
2905 -fno-common gives strict ANSI behavior, though this tends to break
2906 a large body of code that grew up without this rule.
2908 Thread-local variables are never common, since there's no entrenched
2909 body of code to break, and it allows more efficient variable references
2910 in the presense of dynamic linking. */
2912 if (TREE_CODE (decl) == VAR_DECL
2914 && TREE_PUBLIC (decl)
2915 && !DECL_THREAD_LOCAL (decl)
2917 DECL_COMMON (decl) = 1;
2919 /* Set attributes here so if duplicate decl, will have proper attributes. */
2920 decl_attributes (&decl, attributes, 0);
2922 /* If #pragma weak was used, mark the decl weak now. */
2923 if (current_binding_level == global_binding_level)
2924 maybe_apply_pragma_weak (decl);
2926 if (TREE_CODE (decl) == FUNCTION_DECL
2927 && DECL_DECLARED_INLINE_P (decl)
2928 && DECL_UNINLINABLE (decl)
2929 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2930 warning_with_decl (decl,
2931 "inline function `%s' given attribute noinline");
2933 /* Add this decl to the current binding level.
2934 TEM may equal DECL or it may be a previous decl of the same name. */
2935 tem = pushdecl (decl);
2937 /* For a local variable, define the RTL now. */
2938 if (current_binding_level != global_binding_level
2939 /* But not if this is a duplicate decl
2940 and we preserved the rtl from the previous one
2941 (which may or may not happen). */
2942 && !DECL_RTL_SET_P (tem)
2943 && !DECL_CONTEXT (tem))
2945 if (TREE_TYPE (tem) != error_mark_node
2946 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
2948 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2949 && DECL_INITIAL (tem) != 0)
2956 /* Finish processing of a declaration;
2957 install its initial value.
2958 If the length of an array type is not known before,
2959 it must be determined now, from the initial value, or it is an error. */
2962 finish_decl (decl, init, asmspec_tree)
2966 tree type = TREE_TYPE (decl);
2967 int was_incomplete = (DECL_SIZE (decl) == 0);
2968 const char *asmspec = 0;
2970 /* If a name was specified, get the string. */
2971 if (current_binding_level == global_binding_level)
2972 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2974 asmspec = TREE_STRING_POINTER (asmspec_tree);
2976 /* If `start_decl' didn't like having an initialization, ignore it now. */
2977 if (init != 0 && DECL_INITIAL (decl) == 0)
2980 /* Don't crash if parm is initialized. */
2981 if (TREE_CODE (decl) == PARM_DECL)
2985 store_init_value (decl, init);
2987 /* Deduce size of array from initialization, if not already known */
2988 if (TREE_CODE (type) == ARRAY_TYPE
2989 && TYPE_DOMAIN (type) == 0
2990 && TREE_CODE (decl) != TYPE_DECL)
2993 = (TREE_STATIC (decl)
2994 /* Even if pedantic, an external linkage array
2995 may have incomplete type at first. */
2996 ? pedantic && !TREE_PUBLIC (decl)
2997 : !DECL_EXTERNAL (decl));
2999 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3001 /* Get the completed type made by complete_array_type. */
3002 type = TREE_TYPE (decl);
3005 error_with_decl (decl, "initializer fails to determine size of `%s'");
3007 else if (failure == 2)
3010 error_with_decl (decl, "array size missing in `%s'");
3011 /* If a `static' var's size isn't known,
3012 make it extern as well as static, so it does not get
3014 If it is not `static', then do not mark extern;
3015 finish_incomplete_decl will give it a default size
3016 and it will get allocated. */
3017 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3018 DECL_EXTERNAL (decl) = 1;
3021 /* TYPE_MAX_VALUE is always one less than the number of elements
3022 in the array, because we start counting at zero. Therefore,
3023 warn only if the value is less than zero. */
3024 else if (pedantic && TYPE_DOMAIN (type) != 0
3025 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3026 error_with_decl (decl, "zero or negative size array `%s'");
3028 layout_decl (decl, 0);
3031 if (TREE_CODE (decl) == VAR_DECL)
3033 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3034 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3035 layout_decl (decl, 0);
3037 if (DECL_SIZE (decl) == 0
3038 /* Don't give an error if we already gave one earlier. */
3039 && TREE_TYPE (decl) != error_mark_node
3040 && (TREE_STATIC (decl)
3042 /* A static variable with an incomplete type
3043 is an error if it is initialized.
3044 Also if it is not file scope.
3045 Otherwise, let it through, but if it is not `extern'
3046 then it may cause an error message later. */
3047 (DECL_INITIAL (decl) != 0
3048 || DECL_CONTEXT (decl) != 0)
3050 /* An automatic variable with an incomplete type
3052 !DECL_EXTERNAL (decl)))
3054 error_with_decl (decl, "storage size of `%s' isn't known");
3055 TREE_TYPE (decl) = error_mark_node;
3058 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3059 && DECL_SIZE (decl) != 0)
3061 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3062 constant_expression_warning (DECL_SIZE (decl));
3064 error_with_decl (decl, "storage size of `%s' isn't constant");
3067 if (TREE_USED (type))
3068 TREE_USED (decl) = 1;
3071 /* If this is a function and an assembler name is specified, it isn't
3072 builtin any more. Also reset DECL_RTL so we can give it its new
3074 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3076 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3077 SET_DECL_RTL (decl, NULL_RTX);
3078 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3081 /* Output the assembler code and/or RTL code for variables and functions,
3082 unless the type is an undefined structure or union.
3083 If not, it will get done when the type is completed. */
3085 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3087 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3089 objc_check_decl (decl);
3091 if (!DECL_CONTEXT (decl))
3093 if (DECL_INITIAL (decl) == NULL_TREE
3094 || DECL_INITIAL (decl) == error_mark_node)
3095 /* Don't output anything
3096 when a tentative file-scope definition is seen.
3097 But at end of compilation, do output code for them. */
3098 DECL_DEFER_OUTPUT (decl) = 1;
3099 rest_of_decl_compilation (decl, asmspec,
3100 (DECL_CONTEXT (decl) == 0
3101 || TREE_ASM_WRITTEN (decl)), 0);
3105 /* This is a local variable. If there is an ASMSPEC, the
3106 user has requested that we handle it specially. */
3109 /* In conjunction with an ASMSPEC, the `register'
3110 keyword indicates that we should place the variable
3111 in a particular register. */
3112 if (DECL_REGISTER (decl))
3113 DECL_C_HARD_REGISTER (decl) = 1;
3115 /* If this is not a static variable, issue a warning.
3116 It doesn't make any sense to give an ASMSPEC for an
3117 ordinary, non-register local variable. Historically,
3118 GCC has accepted -- but ignored -- the ASMSPEC in
3120 if (TREE_CODE (decl) == VAR_DECL
3121 && !DECL_REGISTER (decl)
3122 && !TREE_STATIC (decl))
3123 warning_with_decl (decl,
3124 "ignoring asm-specifier for non-static local variable `%s'");
3126 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3129 if (TREE_CODE (decl) != FUNCTION_DECL)
3130 add_decl_stmt (decl);
3133 if (DECL_CONTEXT (decl) != 0)
3135 /* Recompute the RTL of a local array now
3136 if it used to be an incomplete type. */
3138 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3140 /* If we used it already as memory, it must stay in memory. */
3141 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3142 /* If it's still incomplete now, no init will save it. */
3143 if (DECL_SIZE (decl) == 0)
3144 DECL_INITIAL (decl) = 0;
3149 if (TREE_CODE (decl) == TYPE_DECL)
3151 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3153 objc_check_decl (decl);
3154 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3157 /* At the end of a declaration, throw away any variable type sizes
3158 of types defined inside that declaration. There is no use
3159 computing them in the following function definition. */
3160 if (current_binding_level == global_binding_level)
3161 get_pending_sizes ();
3164 /* Given a parsed parameter declaration,
3165 decode it into a PARM_DECL and push that on the current binding level.
3166 Also, for the sake of forward parm decls,
3167 record the given order of parms in `parm_order'. */
3170 push_parm_decl (parm)
3174 int old_immediate_size_expand = immediate_size_expand;
3175 /* Don't try computing parm sizes now -- wait till fn is called. */
3176 immediate_size_expand = 0;
3178 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3179 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3180 decl_attributes (&decl, TREE_VALUE (parm), 0);
3183 if (DECL_NAME (decl))
3186 olddecl = lookup_name (DECL_NAME (decl));
3187 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3188 pedwarn_with_decl (decl,
3189 "ISO C forbids parameter `%s' shadowing typedef");
3193 decl = pushdecl (decl);
3195 immediate_size_expand = old_immediate_size_expand;
3197 current_binding_level->parm_order
3198 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3200 /* Add this decl to the current binding level. */
3201 finish_decl (decl, NULL_TREE, NULL_TREE);
3204 /* Clear the given order of parms in `parm_order'.
3205 Used at start of parm list,
3206 and also at semicolon terminating forward decls. */
3211 current_binding_level->parm_order = NULL_TREE;
3214 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3215 literal, which may be an incomplete array type completed by the
3216 initializer; INIT is a CONSTRUCTOR that initializes the compound
3220 build_compound_literal (type, init)
3224 /* We do not use start_decl here because we have a type, not a declarator;
3225 and do not use finish_decl because the decl should be stored inside
3226 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3227 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3230 DECL_EXTERNAL (decl) = 0;
3231 TREE_PUBLIC (decl) = 0;
3232 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3233 DECL_CONTEXT (decl) = current_function_decl;
3234 TREE_USED (decl) = 1;
3235 TREE_TYPE (decl) = type;
3236 TREE_READONLY (decl) = TREE_READONLY (type);
3237 store_init_value (decl, init);
3239 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3241 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3246 type = TREE_TYPE (decl);
3247 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3248 return error_mark_node;
3250 stmt = build_stmt (DECL_STMT, decl);
3251 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3252 TREE_SIDE_EFFECTS (complit) = 1;
3254 layout_decl (decl, 0);
3256 if (TREE_STATIC (decl))
3258 /* This decl needs a name for the assembler output. We also need
3259 a unique suffix to be added to the name. */
3261 extern int var_labelno;
3263 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal", var_labelno);
3265 DECL_NAME (decl) = get_identifier (name);
3266 DECL_DEFER_OUTPUT (decl) = 1;
3267 DECL_COMDAT (decl) = 1;
3268 DECL_ARTIFICIAL (decl) = 1;
3270 rest_of_decl_compilation (decl, NULL, 1, 0);
3276 /* Make TYPE a complete type based on INITIAL_VALUE.
3277 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3278 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3281 complete_array_type (type, initial_value, do_default)
3286 tree maxindex = NULL_TREE;
3291 /* Note MAXINDEX is really the maximum index,
3292 one less than the size. */
3293 if (TREE_CODE (initial_value) == STRING_CST)
3296 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3297 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3300 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3302 tree elts = CONSTRUCTOR_ELTS (initial_value);
3303 maxindex = build_int_2 (-1, -1);
3304 for (; elts; elts = TREE_CHAIN (elts))
3306 if (TREE_PURPOSE (elts))
3307 maxindex = TREE_PURPOSE (elts);
3309 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3310 maxindex, integer_one_node));
3312 maxindex = copy_node (maxindex);
3316 /* Make an error message unless that happened already. */
3317 if (initial_value != error_mark_node)
3320 /* Prevent further error messages. */
3321 maxindex = build_int_2 (0, 0);
3328 maxindex = build_int_2 (0, 0);
3334 TYPE_DOMAIN (type) = build_index_type (maxindex);
3335 if (!TREE_TYPE (maxindex))
3336 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3339 /* Lay out the type now that we can get the real answer. */
3346 /* Determine whether TYPE is a structure with a flexible array member,
3347 or a union containing such a structure (possibly recursively). */
3350 flexible_array_type_p (type)
3354 switch (TREE_CODE (type))
3357 x = TYPE_FIELDS (type);
3360 while (TREE_CHAIN (x) != NULL_TREE)
3362 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3363 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3364 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3365 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3369 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3371 if (flexible_array_type_p (TREE_TYPE (x)))
3380 /* Given declspecs and a declarator,
3381 determine the name and type of the object declared
3382 and construct a ..._DECL node for it.
3383 (In one case we can return a ..._TYPE node instead.
3384 For invalid input we sometimes return 0.)
3386 DECLSPECS is a chain of tree_list nodes whose value fields
3387 are the storage classes and type specifiers.
3389 DECL_CONTEXT says which syntactic context this declaration is in:
3390 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3391 FUNCDEF for a function definition. Like NORMAL but a few different
3392 error messages in each case. Return value may be zero meaning
3393 this definition is too screwy to try to parse.
3394 PARM for a parameter declaration (either within a function prototype
3395 or before a function body). Make a PARM_DECL, or return void_type_node.
3396 TYPENAME if for a typename (in a cast or sizeof).
3397 Don't make a DECL node; just return the ..._TYPE node.
3398 FIELD for a struct or union field; make a FIELD_DECL.
3399 BITFIELD for a field with specified width.
3400 INITIALIZED is 1 if the decl has an initializer.
3402 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3403 It may also be so in the PARM case, for a prototype where the
3404 argument type is specified but not the name.
3406 This function is where the complicated C meanings of `static'
3407 and `extern' are interpreted. */
3410 grokdeclarator (declarator, declspecs, decl_context, initialized)
3413 enum decl_context decl_context;
3418 tree type = NULL_TREE;
3423 int type_quals = TYPE_UNQUALIFIED;
3425 int explicit_int = 0;
3426 int explicit_char = 0;
3427 int defaulted_int = 0;
3428 tree typedef_decl = 0;
3430 tree typedef_type = 0;
3431 int funcdef_flag = 0;
3432 enum tree_code innermost_code = ERROR_MARK;
3434 int size_varies = 0;
3435 tree decl_attr = NULL_TREE;
3436 tree array_ptr_quals = NULL_TREE;
3437 int array_parm_static = 0;
3438 tree returned_attrs = NULL_TREE;
3440 if (decl_context == BITFIELD)
3441 bitfield = 1, decl_context = FIELD;
3443 if (decl_context == FUNCDEF)
3444 funcdef_flag = 1, decl_context = NORMAL;
3446 /* Look inside a declarator for the name being declared
3447 and get it as a string, for an error message. */
3449 tree decl = declarator;
3453 switch (TREE_CODE (decl))
3458 innermost_code = TREE_CODE (decl);
3459 decl = TREE_OPERAND (decl, 0);
3463 decl = TREE_VALUE (decl);
3466 case IDENTIFIER_NODE:
3467 name = IDENTIFIER_POINTER (decl);
3478 /* A function definition's declarator must have the form of
3479 a function declarator. */
3481 if (funcdef_flag && innermost_code != CALL_EXPR)
3484 /* Anything declared one level down from the top level
3485 must be one of the parameters of a function
3486 (because the body is at least two levels down). */
3488 /* If this looks like a function definition, make it one,
3489 even if it occurs where parms are expected.
3490 Then store_parm_decls will reject it and not use it as a parm. */
3491 if (decl_context == NORMAL && !funcdef_flag
3492 && current_binding_level->parm_flag)
3493 decl_context = PARM;
3495 /* Look through the decl specs and record which ones appear.
3496 Some typespecs are defined as built-in typenames.
3497 Others, the ones that are modifiers of other types,
3498 are represented by bits in SPECBITS: set the bits for
3499 the modifiers that appear. Storage class keywords are also in SPECBITS.
3501 If there is a typedef name or a type, store the type in TYPE.
3502 This includes builtin typedefs such as `int'.
3504 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3505 and did not come from a user typedef.
3507 Set LONGLONG if `long' is mentioned twice. */
3509 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3511 tree id = TREE_VALUE (spec);
3513 /* If the entire declaration is itself tagged as deprecated then
3514 suppress reports of deprecated items. */
3515 if (id && TREE_DEPRECATED (id))
3517 if (deprecated_state != DEPRECATED_SUPPRESS)
3518 warn_deprecated_use (id);
3521 if (id == ridpointers[(int) RID_INT])
3523 if (id == ridpointers[(int) RID_CHAR])
3526 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3528 enum rid i = C_RID_CODE (id);
3529 if ((int) i <= (int) RID_LAST_MODIFIER)
3531 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3534 error ("`long long long' is too long for GCC");
3537 if (pedantic && !flag_isoc99 && ! in_system_header
3539 pedwarn ("ISO C90 does not support `long long'");
3543 else if (specbits & (1 << (int) i))
3545 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3548 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3551 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3554 /* Diagnose "__thread extern". Recall that this list
3555 is in the reverse order seen in the text. */
3557 && (specbits & (1 << (int) RID_EXTERN
3558 | 1 << (int) RID_STATIC)))
3560 if (specbits & 1 << (int) RID_EXTERN)
3561 error ("`__thread' before `extern'");
3563 error ("`__thread' before `static'");
3566 specbits |= 1 << (int) i;
3571 error ("two or more data types in declaration of `%s'", name);
3572 /* Actual typedefs come to us as TYPE_DECL nodes. */
3573 else if (TREE_CODE (id) == TYPE_DECL)
3575 if (TREE_TYPE (id) == error_mark_node)
3576 ; /* Allow the type to default to int to avoid cascading errors. */
3579 type = TREE_TYPE (id);
3580 decl_attr = DECL_ATTRIBUTES (id);
3584 /* Built-in types come as identifiers. */
3585 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3587 tree t = lookup_name (id);
3588 if (TREE_TYPE (t) == error_mark_node)
3590 else if (!t || TREE_CODE (t) != TYPE_DECL)
3591 error ("`%s' fails to be a typedef or built in type",
3592 IDENTIFIER_POINTER (id));
3595 type = TREE_TYPE (t);
3599 else if (TREE_CODE (id) != ERROR_MARK)
3606 typedef_type = type;
3608 size_varies = C_TYPE_VARIABLE_SIZE (type);
3610 /* No type at all: default to `int', and set DEFAULTED_INT
3611 because it was not a user-defined typedef. */
3615 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3616 | (1 << (int) RID_SIGNED)
3617 | (1 << (int) RID_UNSIGNED)
3618 | (1 << (int) RID_COMPLEX))))
3619 /* Don't warn about typedef foo = bar. */
3620 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3621 && ! in_system_header)
3623 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3624 and this is a function, or if -Wimplicit; prefer the former
3625 warning since it is more explicit. */
3626 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3628 warn_about_return_type = 1;
3629 else if (warn_implicit_int || flag_isoc99)
3630 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3635 type = integer_type_node;
3638 /* Now process the modifiers that were specified
3639 and check for invalid combinations. */
3641 /* Long double is a special combination. */
3643 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3644 && TYPE_MAIN_VARIANT (type) == double_type_node)
3646 specbits &= ~(1 << (int) RID_LONG);
3647 type = long_double_type_node;
3650 /* Check all other uses of type modifiers. */
3652 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3653 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3657 if ((specbits & 1 << (int) RID_LONG)
3658 && (specbits & 1 << (int) RID_SHORT))
3659 error ("both long and short specified for `%s'", name);
3660 else if (((specbits & 1 << (int) RID_LONG)
3661 || (specbits & 1 << (int) RID_SHORT))
3663 error ("long or short specified with char for `%s'", name);
3664 else if (((specbits & 1 << (int) RID_LONG)
3665 || (specbits & 1 << (int) RID_SHORT))
3666 && TREE_CODE (type) == REAL_TYPE)
3668 static int already = 0;
3670 error ("long or short specified with floating type for `%s'", name);
3671 if (! already && ! pedantic)
3673 error ("the only valid combination is `long double'");
3677 else if ((specbits & 1 << (int) RID_SIGNED)
3678 && (specbits & 1 << (int) RID_UNSIGNED))
3679 error ("both signed and unsigned specified for `%s'", name);
3680 else if (TREE_CODE (type) != INTEGER_TYPE)
3681 error ("long, short, signed or unsigned invalid for `%s'", name);
3685 if (!explicit_int && !defaulted_int && !explicit_char)
3687 error ("long, short, signed or unsigned used invalidly for `%s'",
3693 /* Discard the type modifiers if they are invalid. */
3696 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3697 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3702 if ((specbits & (1 << (int) RID_COMPLEX))
3703 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3705 error ("complex invalid for `%s'", name);
3706 specbits &= ~(1 << (int) RID_COMPLEX);
3709 /* Decide whether an integer type is signed or not.
3710 Optionally treat bitfields as signed by default. */
3711 if (specbits & 1 << (int) RID_UNSIGNED
3712 || (bitfield && ! flag_signed_bitfields
3713 && (explicit_int || defaulted_int || explicit_char
3714 /* A typedef for plain `int' without `signed'
3715 can be controlled just like plain `int'. */
3716 || ! (typedef_decl != 0
3717 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3718 && TREE_CODE (type) != ENUMERAL_TYPE
3719 && !(specbits & 1 << (int) RID_SIGNED)))
3722 type = long_long_unsigned_type_node;
3723 else if (specbits & 1 << (int) RID_LONG)
3724 type = long_unsigned_type_node;
3725 else if (specbits & 1 << (int) RID_SHORT)
3726 type = short_unsigned_type_node;
3727 else if (type == char_type_node)
3728 type = unsigned_char_type_node;
3729 else if (typedef_decl)
3730 type = c_common_unsigned_type (type);
3732 type = unsigned_type_node;
3734 else if ((specbits & 1 << (int) RID_SIGNED)
3735 && type == char_type_node)
3736 type = signed_char_type_node;
3738 type = long_long_integer_type_node;
3739 else if (specbits & 1 << (int) RID_LONG)
3740 type = long_integer_type_node;
3741 else if (specbits & 1 << (int) RID_SHORT)
3742 type = short_integer_type_node;
3744 if (specbits & 1 << (int) RID_COMPLEX)
3746 if (pedantic && !flag_isoc99)
3747 pedwarn ("ISO C90 does not support complex types");
3748 /* If we just have "complex", it is equivalent to
3749 "complex double", but if any modifiers at all are specified it is
3750 the complex form of TYPE. E.g, "complex short" is
3751 "complex short int". */
3753 if (defaulted_int && ! longlong
3754 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3755 | (1 << (int) RID_SIGNED)
3756 | (1 << (int) RID_UNSIGNED))))
3759 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3760 type = complex_double_type_node;
3762 else if (type == integer_type_node)
3765 pedwarn ("ISO C does not support complex integer types");
3766 type = complex_integer_type_node;
3768 else if (type == float_type_node)
3769 type = complex_float_type_node;
3770 else if (type == double_type_node)
3771 type = complex_double_type_node;
3772 else if (type == long_double_type_node)
3773 type = complex_long_double_type_node;
3777 pedwarn ("ISO C does not support complex integer types");
3778 type = build_complex_type (type);
3782 /* Figure out the type qualifiers for the declaration. There are
3783 two ways a declaration can become qualified. One is something
3784 like `const int i' where the `const' is explicit. Another is
3785 something like `typedef const int CI; CI i' where the type of the
3786 declaration contains the `const'. */
3787 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3788 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
3789 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3790 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3791 if (constp > 1 && ! flag_isoc99)
3792 pedwarn ("duplicate `const'");
3793 if (restrictp > 1 && ! flag_isoc99)
3794 pedwarn ("duplicate `restrict'");
3795 if (volatilep > 1 && ! flag_isoc99)
3796 pedwarn ("duplicate `volatile'");
3797 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3798 type = TYPE_MAIN_VARIANT (type);
3799 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3800 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3801 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3803 /* Warn if two storage classes are given. Default to `auto'. */
3808 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3809 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3810 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3811 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3812 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3814 /* "static __thread" and "extern __thread" are allowed. */
3815 if ((specbits & (1 << (int) RID_THREAD
3816 | 1 << (int) RID_STATIC
3817 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3820 /* Warn about storage classes that are invalid for certain
3821 kinds of declarations (parameters, typenames, etc.). */
3824 error ("multiple storage classes in declaration of `%s'", name);
3825 else if (funcdef_flag
3827 & ((1 << (int) RID_REGISTER)
3828 | (1 << (int) RID_AUTO)
3829 | (1 << (int) RID_TYPEDEF)
3830 | (1 << (int) RID_THREAD))))
3832 if (specbits & 1 << (int) RID_AUTO
3833 && (pedantic || current_binding_level == global_binding_level))
3834 pedwarn ("function definition declared `auto'");
3835 if (specbits & 1 << (int) RID_REGISTER)
3836 error ("function definition declared `register'");
3837 if (specbits & 1 << (int) RID_TYPEDEF)
3838 error ("function definition declared `typedef'");
3839 if (specbits & 1 << (int) RID_THREAD)
3840 error ("function definition declared `__thread'");
3841 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3842 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3844 else if (decl_context != NORMAL && nclasses > 0)
3846 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3850 switch (decl_context)
3853 error ("storage class specified for structure field `%s'",
3857 error ("storage class specified for parameter `%s'", name);
3860 error ("storage class specified for typename");
3863 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3864 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3865 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3868 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3870 /* `extern' with initialization is invalid if not at top level. */
3871 if (current_binding_level == global_binding_level)
3872 warning ("`%s' initialized and declared `extern'", name);
3874 error ("`%s' has both `extern' and initializer", name);
3876 else if (current_binding_level == global_binding_level)
3878 if (specbits & 1 << (int) RID_AUTO)
3879 error ("top-level declaration of `%s' specifies `auto'", name);
3883 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3884 error ("nested function `%s' declared `extern'", name);
3885 else if ((specbits & (1 << (int) RID_THREAD
3886 | 1 << (int) RID_EXTERN
3887 | 1 << (int) RID_STATIC))
3888 == (1 << (int) RID_THREAD))
3890 error ("function-scope `%s' implicitly auto and declared `__thread'",
3892 specbits &= ~(1 << (int) RID_THREAD);
3897 /* Now figure out the structure of the declarator proper.
3898 Descend through it, creating more complex types, until we reach
3899 the declared identifier (or NULL_TREE, in an absolute declarator). */
3901 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3903 if (type == error_mark_node)
3905 declarator = TREE_OPERAND (declarator, 0);
3909 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3910 an INDIRECT_REF (for *...),
3911 a CALL_EXPR (for ...(...)),
3912 a TREE_LIST (for nested attributes),
3913 an identifier (for the name being declared)
3914 or a null pointer (for the place in an absolute declarator
3915 where the name was omitted).
3916 For the last two cases, we have just exited the loop.
3918 At this point, TYPE is the type of elements of an array,
3919 or for a function to return, or for a pointer to point to.
3920 After this sequence of ifs, TYPE is the type of the
3921 array or function or pointer, and DECLARATOR has had its
3922 outermost layer removed. */
3924 if (array_ptr_quals != NULL_TREE || array_parm_static)
3926 /* Only the innermost declarator (making a parameter be of
3927 array type which is converted to pointer type)
3928 may have static or type qualifiers. */
3929 error ("static or type qualifiers in non-parameter array declarator");
3930 array_ptr_quals = NULL_TREE;
3931 array_parm_static = 0;
3934 if (TREE_CODE (declarator) == TREE_LIST)
3936 /* We encode a declarator with embedded attributes using
3938 tree attrs = TREE_PURPOSE (declarator);
3941 declarator = TREE_VALUE (declarator);
3942 inner_decl = declarator;
3943 while (inner_decl != NULL_TREE
3944 && TREE_CODE (inner_decl) == TREE_LIST)
3945 inner_decl = TREE_VALUE (inner_decl);
3946 if (inner_decl == NULL_TREE
3947 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3948 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3949 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3950 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3951 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3952 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3953 returned_attrs = decl_attributes (&type,
3954 chainon (returned_attrs, attrs),
3957 else if (TREE_CODE (declarator) == ARRAY_REF)
3959 tree itype = NULL_TREE;
3960 tree size = TREE_OPERAND (declarator, 1);
3961 /* The index is a signed object `sizetype' bits wide. */
3962 tree index_type = c_common_signed_type (sizetype);
3964 array_ptr_quals = TREE_TYPE (declarator);
3965 array_parm_static = TREE_STATIC (declarator);
3967 declarator = TREE_OPERAND (declarator, 0);
3969 /* Check for some types that there cannot be arrays of. */
3971 if (VOID_TYPE_P (type))
3973 error ("declaration of `%s' as array of voids", name);
3974 type = error_mark_node;
3977 if (TREE_CODE (type) == FUNCTION_TYPE)
3979 error ("declaration of `%s' as array of functions", name);
3980 type = error_mark_node;
3983 if (pedantic && flexible_array_type_p (type))
3984 pedwarn ("invalid use of structure with flexible array member");
3986 if (size == error_mark_node)
3987 type = error_mark_node;
3989 if (type == error_mark_node)
3992 /* If size was specified, set ITYPE to a range-type for that size.
3993 Otherwise, ITYPE remains null. finish_decl may figure it out
3994 from an initial value. */
3998 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3999 STRIP_TYPE_NOPS (size);
4001 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4003 error ("size of array `%s' has non-integer type", name);
4004 size = integer_one_node;
4007 if (pedantic && integer_zerop (size))
4008 pedwarn ("ISO C forbids zero-size array `%s'", name);
4010 if (TREE_CODE (size) == INTEGER_CST)
4012 constant_expression_warning (size);
4013 if (tree_int_cst_sgn (size) < 0)
4015 error ("size of array `%s' is negative", name);
4016 size = integer_one_node;
4021 /* Make sure the array size remains visibly nonconstant
4022 even if it is (eg) a const variable with known value. */
4025 if (!flag_isoc99 && pedantic)
4027 if (TREE_CONSTANT (size))
4028 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
4031 pedwarn ("ISO C90 forbids variable-size array `%s'",
4036 if (integer_zerop (size))
4038 /* A zero-length array cannot be represented with an
4039 unsigned index type, which is what we'll get with
4040 build_index_type. Create an open-ended range instead. */
4041 itype = build_range_type (sizetype, size, NULL_TREE);
4045 /* Compute the maximum valid index, that is, size - 1.
4046 Do the calculation in index_type, so that if it is
4047 a variable the computations will be done in the
4049 itype = fold (build (MINUS_EXPR, index_type,
4050 convert (index_type, size),
4051 convert (index_type, size_one_node)));
4053 /* If that overflowed, the array is too big.
4054 ??? While a size of INT_MAX+1 technically shouldn't
4055 cause an overflow (because we subtract 1), the overflow
4056 is recorded during the conversion to index_type, before
4057 the subtraction. Handling this case seems like an
4058 unnecessary complication. */
4059 if (TREE_OVERFLOW (itype))
4061 error ("size of array `%s' is too large", name);
4062 type = error_mark_node;
4067 itype = variable_size (itype);
4068 itype = build_index_type (itype);
4071 else if (decl_context == FIELD)
4073 if (pedantic && !flag_isoc99 && !in_system_header)
4074 pedwarn ("ISO C90 does not support flexible array members");
4076 /* ISO C99 Flexible array members are effectively identical
4077 to GCC's zero-length array extension. */
4078 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4081 /* If pedantic, complain about arrays of incomplete types. */
4083 if (pedantic && !COMPLETE_TYPE_P (type))
4084 pedwarn ("array type has incomplete element type");
4087 /* We shouldn't have a function type here at all!
4088 Functions aren't allowed as array elements. */
4089 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4090 && (constp || volatilep))
4091 pedwarn ("ISO C forbids const or volatile function types");
4094 /* Build the array type itself, then merge any constancy or
4095 volatility into the target type. We must do it in this order
4096 to ensure that the TYPE_MAIN_VARIANT field of the array type
4097 is set correctly. */
4099 type = build_array_type (type, itype);
4101 type = c_build_qualified_type (type, type_quals);
4104 C_TYPE_VARIABLE_SIZE (type) = 1;
4106 /* The GCC extension for zero-length arrays differs from
4107 ISO flexible array members in that sizeof yields zero. */
4108 if (size && integer_zerop (size))
4111 TYPE_SIZE (type) = bitsize_zero_node;
4112 TYPE_SIZE_UNIT (type) = size_zero_node;
4114 if (decl_context != PARM
4115 && (array_ptr_quals != NULL_TREE || array_parm_static))
4117 error ("static or type qualifiers in non-parameter array declarator");
4118 array_ptr_quals = NULL_TREE;
4119 array_parm_static = 0;
4122 else if (TREE_CODE (declarator) == CALL_EXPR)
4126 /* Declaring a function type.
4127 Make sure we have a valid type for the function to return. */
4128 if (type == error_mark_node)
4133 /* Warn about some types functions can't return. */
4135 if (TREE_CODE (type) == FUNCTION_TYPE)
4137 error ("`%s' declared as function returning a function", name);
4138 type = integer_type_node;
4140 if (TREE_CODE (type) == ARRAY_TYPE)
4142 error ("`%s' declared as function returning an array", name);
4143 type = integer_type_node;
4146 /* Construct the function type and go to the next
4147 inner layer of declarator. */
4149 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4151 /* Say it's a definition
4152 only for the CALL_EXPR
4153 closest to the identifier. */
4154 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4155 /* Type qualifiers before the return type of the function
4156 qualify the return type, not the function type. */
4159 /* Type qualifiers on a function return type are normally
4160 permitted by the standard but have no effect, so give a
4161 warning at -W. Qualifiers on a void return type have
4162 meaning as a GNU extension, and are banned on function
4163 definitions in ISO C. FIXME: strictly we shouldn't
4164 pedwarn for qualified void return types except on function
4165 definitions, but not doing so could lead to the undesirable
4166 state of a "volatile void" function return type not being
4167 warned about, and a use of the function being compiled
4168 with GNU semantics, with no diagnostics under -pedantic. */
4169 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4170 pedwarn ("ISO C forbids qualified void function return type");
4171 else if (extra_warnings
4172 && !(VOID_TYPE_P (type)
4173 && type_quals == TYPE_QUAL_VOLATILE))
4174 warning ("type qualifiers ignored on function return type");
4176 type = c_build_qualified_type (type, type_quals);
4178 type_quals = TYPE_UNQUALIFIED;
4180 type = build_function_type (type, arg_types);
4181 declarator = TREE_OPERAND (declarator, 0);
4183 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4184 the formal parameter list of this FUNCTION_TYPE to point to
4185 the FUNCTION_TYPE node itself. */
4190 for (link = last_function_parm_tags;
4192 link = TREE_CHAIN (link))
4193 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4196 else if (TREE_CODE (declarator) == INDIRECT_REF)
4198 /* Merge any constancy or volatility into the target type
4201 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4203 pedwarn ("ISO C forbids qualified function types");
4205 type = c_build_qualified_type (type, type_quals);
4206 type_quals = TYPE_UNQUALIFIED;
4209 type = build_pointer_type (type);
4211 /* Process a list of type modifier keywords
4212 (such as const or volatile) that were given inside the `*'. */
4214 if (TREE_TYPE (declarator))
4222 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4223 typemodlist = TREE_CHAIN (typemodlist))
4225 tree qualifier = TREE_VALUE (typemodlist);
4227 if (C_IS_RESERVED_WORD (qualifier))
4229 if (C_RID_CODE (qualifier) == RID_CONST)
4231 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4233 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4243 error ("invalid type modifier within pointer declarator");
4244 if (constp > 1 && ! flag_isoc99)
4245 pedwarn ("duplicate `const'");
4246 if (volatilep > 1 && ! flag_isoc99)
4247 pedwarn ("duplicate `volatile'");
4248 if (restrictp > 1 && ! flag_isoc99)
4249 pedwarn ("duplicate `restrict'");
4251 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4252 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4253 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4256 declarator = TREE_OPERAND (declarator, 0);
4263 /* Now TYPE has the actual type. */
4265 /* Did array size calculations overflow? */
4267 if (TREE_CODE (type) == ARRAY_TYPE
4268 && COMPLETE_TYPE_P (type)
4269 && TREE_OVERFLOW (TYPE_SIZE (type)))
4271 error ("size of array `%s' is too large", name);
4272 /* If we proceed with the array type as it is, we'll eventually
4273 crash in tree_low_cst(). */
4274 type = error_mark_node;
4277 /* If this is declaring a typedef name, return a TYPE_DECL. */
4279 if (specbits & (1 << (int) RID_TYPEDEF))
4282 /* Note that the grammar rejects storage classes
4283 in typenames, fields or parameters */
4284 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4286 pedwarn ("ISO C forbids qualified function types");
4288 type = c_build_qualified_type (type, type_quals);
4289 decl = build_decl (TYPE_DECL, declarator, type);
4290 if ((specbits & (1 << (int) RID_SIGNED))
4291 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4292 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4293 decl_attributes (&decl, returned_attrs, 0);
4297 /* Detect the case of an array type of unspecified size
4298 which came, as such, direct from a typedef name.
4299 We must copy the type, so that each identifier gets
4300 a distinct type, so that each identifier's size can be
4301 controlled separately by its own initializer. */
4303 if (type != 0 && typedef_type != 0
4304 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4305 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4307 type = build_array_type (TREE_TYPE (type), 0);
4309 C_TYPE_VARIABLE_SIZE (type) = 1;
4312 /* If this is a type name (such as, in a cast or sizeof),
4313 compute the type and return it now. */
4315 if (decl_context == TYPENAME)
4317 /* Note that the grammar rejects storage classes
4318 in typenames, fields or parameters */
4319 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4321 pedwarn ("ISO C forbids const or volatile function types");
4323 type = c_build_qualified_type (type, type_quals);
4324 decl_attributes (&type, returned_attrs, 0);
4328 /* Aside from typedefs and type names (handle above),
4329 `void' at top level (not within pointer)
4330 is allowed only in public variables.
4331 We don't complain about parms either, but that is because
4332 a better error message can be made later. */
4334 if (VOID_TYPE_P (type) && decl_context != PARM
4335 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4336 && ((specbits & (1 << (int) RID_EXTERN))
4337 || (current_binding_level == global_binding_level
4339 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4341 error ("variable or field `%s' declared void", name);
4342 type = integer_type_node;
4345 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4346 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4351 if (decl_context == PARM)
4353 tree type_as_written;
4356 /* A parameter declared as an array of T is really a pointer to T.
4357 One declared as a function is really a pointer to a function. */
4359 if (TREE_CODE (type) == ARRAY_TYPE)
4361 /* Transfer const-ness of array into that of type pointed to. */
4362 type = TREE_TYPE (type);
4364 type = c_build_qualified_type (type, type_quals);
4365 type = build_pointer_type (type);
4366 type_quals = TYPE_UNQUALIFIED;
4367 if (array_ptr_quals)
4369 tree new_ptr_quals, new_ptr_attrs;
4371 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4372 /* We don't yet implement attributes in this context. */
4373 if (new_ptr_attrs != NULL_TREE)
4374 warning ("attributes in parameter array declarator ignored");
4379 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4381 tree qualifier = TREE_VALUE (new_ptr_quals);
4383 if (C_IS_RESERVED_WORD (qualifier))
4385 if (C_RID_CODE (qualifier) == RID_CONST)
4387 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4389 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4399 error ("invalid type modifier within array declarator");
4401 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4402 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4403 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4407 else if (TREE_CODE (type) == FUNCTION_TYPE)
4409 if (pedantic && type_quals)
4410 pedwarn ("ISO C forbids qualified function types");
4412 type = c_build_qualified_type (type, type_quals);
4413 type = build_pointer_type (type);
4414 type_quals = TYPE_UNQUALIFIED;
4416 else if (type_quals)
4417 type = c_build_qualified_type (type, type_quals);
4419 type_as_written = type;
4421 decl = build_decl (PARM_DECL, declarator, type);
4423 C_DECL_VARIABLE_SIZE (decl) = 1;
4425 /* Compute the type actually passed in the parmlist,
4426 for the case where there is no prototype.
4427 (For example, shorts and chars are passed as ints.)
4428 When there is a prototype, this is overridden later. */
4430 if (type == error_mark_node)
4431 promoted_type = type;
4433 promoted_type = c_type_promotes_to (type);
4435 DECL_ARG_TYPE (decl) = promoted_type;
4436 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4438 else if (decl_context == FIELD)
4440 /* Structure field. It may not be a function. */
4442 if (TREE_CODE (type) == FUNCTION_TYPE)
4444 error ("field `%s' declared as a function", name);
4445 type = build_pointer_type (type);
4447 else if (TREE_CODE (type) != ERROR_MARK
4448 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4450 error ("field `%s' has incomplete type", name);
4451 type = error_mark_node;
4453 /* Move type qualifiers down to element of an array. */
4454 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4456 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4458 TYPE_DOMAIN (type));
4460 /* Leave the field const or volatile as well. */
4461 type_quals = TYPE_UNQUALIFIED;
4464 decl = build_decl (FIELD_DECL, declarator, type);
4465 DECL_NONADDRESSABLE_P (decl) = bitfield;
4468 C_DECL_VARIABLE_SIZE (decl) = 1;
4470 else if (TREE_CODE (type) == FUNCTION_TYPE)
4472 /* Every function declaration is "external"
4473 except for those which are inside a function body
4474 in which `auto' is used.
4475 That is a case not specified by ANSI C,
4476 and we use it for forward declarations for nested functions. */
4477 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4478 || current_binding_level == global_binding_level);
4480 if (specbits & (1 << (int) RID_AUTO)
4481 && (pedantic || current_binding_level == global_binding_level))
4482 pedwarn ("invalid storage class for function `%s'", name);
4483 if (specbits & (1 << (int) RID_REGISTER))
4484 error ("invalid storage class for function `%s'", name);
4485 if (specbits & (1 << (int) RID_THREAD))
4486 error ("invalid storage class for function `%s'", name);
4487 /* Function declaration not at top level.
4488 Storage classes other than `extern' are not allowed
4489 and `extern' makes no difference. */
4490 if (current_binding_level != global_binding_level
4491 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4493 pedwarn ("invalid storage class for function `%s'", name);
4495 decl = build_decl (FUNCTION_DECL, declarator, type);
4496 decl = build_decl_attribute_variant (decl, decl_attr);
4498 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4499 ggc_alloc_cleared (sizeof (struct lang_decl));
4501 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4502 pedwarn ("ISO C forbids qualified function types");
4504 /* GNU C interprets a `volatile void' return type to indicate
4505 that the function does not return. */
4506 if ((type_quals & TYPE_QUAL_VOLATILE)
4507 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4508 warning ("`noreturn' function returns non-void value");
4511 DECL_EXTERNAL (decl) = 1;
4512 /* Record absence of global scope for `static' or `auto'. */
4514 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4517 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4519 /* Record presence of `inline', if it is reasonable. */
4520 if (MAIN_NAME_P (declarator))
4523 warning ("cannot inline function `main'");
4527 /* Assume that otherwise the function can be inlined. */
4528 DECL_DECLARED_INLINE_P (decl) = 1;
4530 /* Do not mark bare declarations as DECL_INLINE. Doing so
4531 in the presence of multiple declarations can result in
4532 the abstract origin pointing between the declarations,
4533 which will confuse dwarf2out. */
4536 DECL_INLINE (decl) = 1;
4537 if (specbits & (1 << (int) RID_EXTERN))
4538 current_extern_inline = 1;
4541 /* If -finline-functions, assume it can be inlined. This does
4542 two things: let the function be deferred until it is actually
4543 needed, and let dwarf2 know that the function is inlinable. */
4544 else if (flag_inline_trees == 2 && initialized)
4546 DECL_INLINE (decl) = 1;
4547 DECL_DECLARED_INLINE_P (decl) = 0;
4552 /* It's a variable. */
4553 /* An uninitialized decl with `extern' is a reference. */
4554 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4556 /* Move type qualifiers down to element of an array. */
4557 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4559 int saved_align = TYPE_ALIGN(type);
4560 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4562 TYPE_DOMAIN (type));
4563 TYPE_ALIGN (type) = saved_align;
4564 #if 0 /* Leave the variable const or volatile as well. */
4565 type_quals = TYPE_UNQUALIFIED;
4568 else if (type_quals)
4569 type = c_build_qualified_type (type, type_quals);
4571 decl = build_decl (VAR_DECL, declarator, type);
4573 C_DECL_VARIABLE_SIZE (decl) = 1;
4576 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4578 DECL_EXTERNAL (decl) = extern_ref;
4580 /* At top level, the presence of a `static' or `register' storage
4581 class specifier, or the absence of all storage class specifiers
4582 makes this declaration a definition (perhaps tentative). Also,
4583 the absence of both `static' and `register' makes it public. */
4584 if (current_binding_level == global_binding_level)
4586 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4587 | (1 << (int) RID_REGISTER)));
4588 TREE_STATIC (decl) = !extern_ref;
4590 /* Not at top level, only `static' makes a static definition. */
4593 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4594 TREE_PUBLIC (decl) = extern_ref;
4597 if (specbits & 1 << (int) RID_THREAD)
4599 if (targetm.have_tls)
4600 DECL_THREAD_LOCAL (decl) = 1;
4602 /* A mere warning is sure to result in improper semantics
4603 at runtime. Don't bother to allow this to compile. */
4604 error ("thread-local storage not supported for this target");
4608 /* Record `register' declaration for warnings on &
4609 and in case doing stupid register allocation. */
4611 if (specbits & (1 << (int) RID_REGISTER))
4612 DECL_REGISTER (decl) = 1;
4614 /* Record constancy and volatility. */
4615 c_apply_type_quals_to_decl (type_quals, decl);
4617 /* If a type has volatile components, it should be stored in memory.
4618 Otherwise, the fact that those components are volatile
4619 will be ignored, and would even crash the compiler. */
4620 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4621 c_mark_addressable (decl);
4623 decl_attributes (&decl, returned_attrs, 0);
4629 /* Decode the parameter-list info for a function type or function definition.
4630 The argument is the value returned by `get_parm_info' (or made in parse.y
4631 if there is an identifier list instead of a parameter decl list).
4632 These two functions are separate because when a function returns
4633 or receives functions then each is called multiple times but the order
4634 of calls is different. The last call to `grokparms' is always the one
4635 that contains the formal parameter names of a function definition.
4637 Store in `last_function_parms' a chain of the decls of parms.
4638 Also store in `last_function_parm_tags' a chain of the struct, union,
4639 and enum tags declared among the parms.
4641 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4643 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4644 a mere declaration. A nonempty identifier-list gets an error message
4645 when FUNCDEF_FLAG is zero. */
4648 grokparms (parms_info, funcdef_flag)
4652 tree first_parm = TREE_CHAIN (parms_info);
4654 last_function_parms = TREE_PURPOSE (parms_info);
4655 last_function_parm_tags = TREE_VALUE (parms_info);
4657 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4658 && !in_system_header)
4659 warning ("function declaration isn't a prototype");
4662 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4665 pedwarn ("parameter names (without types) in function declaration");
4667 last_function_parms = first_parm;
4674 /* We no longer test FUNCDEF_FLAG.
4675 If the arg types are incomplete in a declaration,
4676 they must include undefined tags.
4677 These tags can never be defined in the scope of the declaration,
4678 so the types can never be completed,
4679 and no call can be compiled successfully. */
4681 /* In a fcn definition, arg types must be complete. */
4684 for (parm = last_function_parms, typelt = first_parm;
4686 parm = TREE_CHAIN (parm))
4687 /* Skip over any enumeration constants declared here. */
4688 if (TREE_CODE (parm) == PARM_DECL)
4690 /* Barf if the parameter itself has an incomplete type. */
4691 tree type = TREE_VALUE (typelt);
4692 if (type == error_mark_node)
4694 if (!COMPLETE_TYPE_P (type))
4696 if (funcdef_flag && DECL_NAME (parm) != 0)
4697 error ("parameter `%s' has incomplete type",
4698 IDENTIFIER_POINTER (DECL_NAME (parm)));
4700 warning ("parameter has incomplete type");
4703 TREE_VALUE (typelt) = error_mark_node;
4704 TREE_TYPE (parm) = error_mark_node;
4708 /* This has been replaced by parm_tags_warning, which
4709 uses a more accurate criterion for what to warn
4713 /* Now warn if is a pointer to an incomplete type. */
4714 while (TREE_CODE (type) == POINTER_TYPE
4715 || TREE_CODE (type) == REFERENCE_TYPE)
4716 type = TREE_TYPE (type);
4717 type = TYPE_MAIN_VARIANT (type);
4718 if (!COMPLETE_TYPE_P (type))
4720 if (DECL_NAME (parm) != 0)
4721 warning ("parameter `%s' points to incomplete type",
4722 IDENTIFIER_POINTER (DECL_NAME (parm)));
4724 warning ("parameter points to incomplete type");
4728 typelt = TREE_CHAIN (typelt);
4735 /* Return a tree_list node with info on a parameter list just parsed.
4736 The TREE_PURPOSE is a chain of decls of those parms.
4737 The TREE_VALUE is a list of structure, union and enum tags defined.
4738 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4739 This tree_list node is later fed to `grokparms'.
4741 VOID_AT_END nonzero means append `void' to the end of the type-list.
4742 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4745 get_parm_info (void_at_end)
4751 tree tags = gettags ();
4752 tree parms = getdecls ();
4754 tree order = current_binding_level->parm_order;
4756 /* Just `void' (and no ellipsis) is special. There are really no parms.
4757 But if the `void' is qualified (by `const' or `volatile') or has a
4758 storage class specifier (`register'), then the behavior is undefined;
4759 by not counting it as the special case of `void' we will cause an
4760 error later. Typedefs for `void' are OK (see DR#157). */
4761 if (void_at_end && parms != 0
4762 && TREE_CHAIN (parms) == 0
4763 && VOID_TYPE_P (TREE_TYPE (parms))
4764 && ! TREE_THIS_VOLATILE (parms)
4765 && ! TREE_READONLY (parms)
4766 && ! DECL_REGISTER (parms)
4767 && DECL_NAME (parms) == 0)
4770 storedecls (NULL_TREE);
4771 return tree_cons (NULL_TREE, NULL_TREE,
4772 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4775 /* Extract enumerator values and other non-parms declared with the parms.
4776 Likewise any forward parm decls that didn't have real parm decls. */
4777 for (decl = parms; decl;)
4779 tree next = TREE_CHAIN (decl);
4781 if (TREE_CODE (decl) != PARM_DECL)
4783 TREE_CHAIN (decl) = new_parms;
4786 else if (TREE_ASM_WRITTEN (decl))
4788 error_with_decl (decl,
4789 "parameter `%s' has just a forward declaration");
4790 TREE_CHAIN (decl) = new_parms;
4796 /* Put the parm decls back in the order they were in in the parm list. */
4797 for (t = order; t; t = TREE_CHAIN (t))
4800 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4802 TREE_CHAIN (TREE_VALUE (t)) = 0;
4805 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4808 /* Store the parmlist in the binding level since the old one
4809 is no longer a valid list. (We have changed the chain pointers.) */
4810 storedecls (new_parms);
4812 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4813 /* There may also be declarations for enumerators if an enumeration
4814 type is declared among the parms. Ignore them here. */
4815 if (TREE_CODE (decl) == PARM_DECL)
4817 /* Since there is a prototype,
4818 args are passed in their declared types. */
4819 tree type = TREE_TYPE (decl);
4820 DECL_ARG_TYPE (decl) = type;
4821 if (PROMOTE_PROTOTYPES
4822 && INTEGRAL_TYPE_P (type)
4823 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4824 DECL_ARG_TYPE (decl) = integer_type_node;
4826 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4827 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
4828 && DECL_NAME (decl) == 0)
4830 error ("`void' in parameter list must be the entire list");
4836 return tree_cons (new_parms, tags,
4837 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
4839 return tree_cons (new_parms, tags, nreverse (types));
4842 /* At end of parameter list, warn about any struct, union or enum tags
4843 defined within. Do so because these types cannot ever become complete. */
4846 parmlist_tags_warning ()
4851 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4853 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4854 /* An anonymous union parm type is meaningful as a GNU extension.
4855 So don't warn for that. */
4856 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
4858 if (TREE_PURPOSE (elt) != 0)
4860 if (code == RECORD_TYPE)
4861 warning ("`struct %s' declared inside parameter list",
4862 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4863 else if (code == UNION_TYPE)
4864 warning ("`union %s' declared inside parameter list",
4865 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4867 warning ("`enum %s' declared inside parameter list",
4868 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4872 /* For translation these need to be separate warnings */
4873 if (code == RECORD_TYPE)
4874 warning ("anonymous struct declared inside parameter list");
4875 else if (code == UNION_TYPE)
4876 warning ("anonymous union declared inside parameter list");
4878 warning ("anonymous enum declared inside parameter list");
4882 warning ("its scope is only this definition or declaration, which is probably not what you want");
4888 /* Get the struct, enum or union (CODE says which) with tag NAME.
4889 Define the tag as a forward-reference if it is not defined. */
4892 xref_tag (code, name)
4893 enum tree_code code;
4896 /* If a cross reference is requested, look up the type
4897 already defined for this tag and return it. */
4899 tree ref = lookup_tag (code, name, current_binding_level, 0);
4900 /* If this is the right type of tag, return what we found.
4901 (This reference will be shadowed by shadow_tag later if appropriate.)
4902 If this is the wrong type of tag, do not return it. If it was the
4903 wrong type in the same binding level, we will have had an error
4904 message already; if in a different binding level and declaring
4905 a name, pending_xref_error will give an error message; but if in a
4906 different binding level and not declaring a name, this tag should
4907 shadow the previous declaration of a different type of tag, and
4908 this would not work properly if we return the reference found.
4909 (For example, with "struct foo" in an outer scope, "union foo;"
4910 must shadow that tag with a new one of union type.) */
4911 if (ref && TREE_CODE (ref) == code)
4914 /* If no such tag is yet defined, create a forward-reference node
4915 and record it as the "definition".
4916 When a real declaration of this type is found,
4917 the forward-reference will be altered into a real type. */
4919 ref = make_node (code);
4920 if (code == ENUMERAL_TYPE)
4922 /* Give the type a default layout like unsigned int
4923 to avoid crashing if it does not get defined. */
4924 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4925 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4926 TYPE_USER_ALIGN (ref) = 0;
4927 TREE_UNSIGNED (ref) = 1;
4928 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4929 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4930 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4933 pushtag (name, ref);
4938 /* Make sure that the tag NAME is defined *in the current binding level*
4939 at least as a forward reference.
4940 CODE says which kind of tag NAME ought to be. */
4943 start_struct (code, name)
4944 enum tree_code code;
4947 /* If there is already a tag defined at this binding level
4948 (as a forward reference), just return it. */
4953 ref = lookup_tag (code, name, current_binding_level, 1);
4954 if (ref && TREE_CODE (ref) == code)
4956 C_TYPE_BEING_DEFINED (ref) = 1;
4957 TYPE_PACKED (ref) = flag_pack_struct;
4958 if (TYPE_FIELDS (ref))
4960 if (code == UNION_TYPE)
4961 error ("redefinition of `union %s'",
4962 IDENTIFIER_POINTER (name));
4964 error ("redefinition of `struct %s'",
4965 IDENTIFIER_POINTER (name));
4971 /* Otherwise create a forward-reference just so the tag is in scope. */
4973 ref = make_node (code);
4974 pushtag (name, ref);
4975 C_TYPE_BEING_DEFINED (ref) = 1;
4976 TYPE_PACKED (ref) = flag_pack_struct;
4980 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4981 of a structure component, returning a FIELD_DECL node.
4982 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4984 This is done during the parsing of the struct declaration.
4985 The FIELD_DECL nodes are chained together and the lot of them
4986 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4989 grokfield (filename, line, declarator, declspecs, width)
4990 const char *filename ATTRIBUTE_UNUSED;
4991 int line ATTRIBUTE_UNUSED;
4992 tree declarator, declspecs, width;
4996 if (declarator == NULL_TREE && width == NULL_TREE)
4998 /* This is an unnamed decl.
5000 If we have something of the form "union { list } ;" then this
5001 is the anonymous union extension. Similarly for struct.
5003 If this is something of the form "struct foo;", then
5004 If MS extensions are enabled, this is handled as an
5006 Otherwise this is a forward declaration of a structure tag.
5008 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5009 If MS extensions are enabled and foo names a structure, then
5010 again this is an anonymous struct.
5011 Otherwise this is an error.
5013 Oh what a horrid tangled web we weave. I wonder if MS consiously
5014 took this from Plan 9 or if it was an accident of implementation
5015 that took root before someone noticed the bug... */
5017 tree type = TREE_VALUE (declspecs);
5019 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
5020 type = TREE_TYPE (type);
5021 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
5023 if (flag_ms_extensions)
5026 goto warn_unnamed_field;
5027 else if (TYPE_NAME (type) == NULL)
5030 goto warn_unnamed_field;
5035 warning ("declaration does not declare anything");
5040 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5042 finish_decl (value, NULL_TREE, NULL_TREE);
5043 DECL_INITIAL (value) = width;
5046 objc_check_decl (value);
5050 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5051 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5052 ATTRIBUTES are attributes to be applied to the structure. */
5055 finish_struct (t, fieldlist, attributes)
5061 int toplevel = global_binding_level == current_binding_level;
5062 int saw_named_field;
5064 /* If this type was previously laid out as a forward reference,
5065 make sure we lay it out again. */
5069 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5071 /* Nameless union parm types are useful as GCC extension. */
5072 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5073 /* Otherwise, warn about any struct or union def. in parmlist. */
5074 if (in_parm_level_p ())
5077 pedwarn ("%s defined inside parms",
5078 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5080 warning ("%s defined inside parms",
5081 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5086 for (x = fieldlist; x; x = TREE_CHAIN (x))
5087 if (DECL_NAME (x) != 0)
5091 pedwarn ("%s has no %s",
5092 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5093 fieldlist ? _("named members") : _("members"));
5096 /* Install struct as DECL_CONTEXT of each field decl.
5097 Also process specified field sizes,m which is found in the DECL_INITIAL.
5098 Store 0 there, except for ": 0" fields (so we can find them
5099 and delete them, below). */
5101 saw_named_field = 0;
5102 for (x = fieldlist; x; x = TREE_CHAIN (x))
5104 DECL_CONTEXT (x) = t;
5105 DECL_PACKED (x) |= TYPE_PACKED (t);
5107 /* If any field is const, the structure type is pseudo-const. */
5108 if (TREE_READONLY (x))
5109 C_TYPE_FIELDS_READONLY (t) = 1;
5112 /* A field that is pseudo-const makes the structure likewise. */
5113 tree t1 = TREE_TYPE (x);
5114 while (TREE_CODE (t1) == ARRAY_TYPE)
5115 t1 = TREE_TYPE (t1);
5116 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5117 && C_TYPE_FIELDS_READONLY (t1))
5118 C_TYPE_FIELDS_READONLY (t) = 1;
5121 /* Any field that is volatile means variables of this type must be
5122 treated in some ways as volatile. */
5123 if (TREE_THIS_VOLATILE (x))
5124 C_TYPE_FIELDS_VOLATILE (t) = 1;
5126 /* Any field of nominal variable size implies structure is too. */
5127 if (C_DECL_VARIABLE_SIZE (x))
5128 C_TYPE_VARIABLE_SIZE (t) = 1;
5130 /* Detect invalid nested redefinition. */
5131 if (TREE_TYPE (x) == t)
5132 error ("nested redefinition of `%s'",
5133 IDENTIFIER_POINTER (TYPE_NAME (t)));
5135 /* Detect invalid bit-field size. */
5136 if (DECL_INITIAL (x))
5137 STRIP_NOPS (DECL_INITIAL (x));
5138 if (DECL_INITIAL (x))
5140 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5141 constant_expression_warning (DECL_INITIAL (x));
5145 "bit-field `%s' width not an integer constant");
5146 DECL_INITIAL (x) = NULL;
5150 /* Detect invalid bit-field type. */
5151 if (DECL_INITIAL (x)
5152 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5153 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5154 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5156 error_with_decl (x, "bit-field `%s' has invalid type");
5157 DECL_INITIAL (x) = NULL;
5160 if (DECL_INITIAL (x) && pedantic
5161 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5162 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5163 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5164 /* Accept an enum that's equivalent to int or unsigned int. */
5165 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5166 && (TYPE_PRECISION (TREE_TYPE (x))
5167 == TYPE_PRECISION (integer_type_node))))
5168 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5170 /* Detect and ignore out of range field width and process valid
5172 if (DECL_INITIAL (x))
5175 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
5176 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5178 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5179 error_with_decl (x, "negative width in bit-field `%s'");
5180 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5181 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5182 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5183 error_with_decl (x, "zero width for bit-field `%s'");
5186 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5187 unsigned HOST_WIDE_INT width
5188 = tree_low_cst (DECL_INITIAL (x), 1);
5190 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5191 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5192 TREE_UNSIGNED (TREE_TYPE (x)))
5194 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5195 TREE_UNSIGNED (TREE_TYPE (x))))))
5196 warning_with_decl (x,
5197 "`%s' is narrower than values of its type");
5199 DECL_SIZE (x) = bitsize_int (width);
5200 DECL_BIT_FIELD (x) = 1;
5201 SET_DECL_C_BIT_FIELD (x);
5204 && ! (* targetm.ms_bitfield_layout_p) (t))
5206 /* field size 0 => force desired amount of alignment. */
5207 #ifdef EMPTY_FIELD_BOUNDARY
5208 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5210 #ifdef PCC_BITFIELD_TYPE_MATTERS
5211 if (PCC_BITFIELD_TYPE_MATTERS)
5213 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5214 TYPE_ALIGN (TREE_TYPE (x)));
5215 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5222 else if (TREE_TYPE (x) != error_mark_node)
5224 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5225 : TYPE_ALIGN (TREE_TYPE (x)));
5227 /* Non-bit-fields are aligned for their type, except packed
5228 fields which require only BITS_PER_UNIT alignment. */
5229 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5230 if (! DECL_PACKED (x))
5231 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5234 DECL_INITIAL (x) = 0;
5236 /* Detect flexible array member in an invalid context. */
5237 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5238 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5239 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5240 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5242 if (TREE_CODE (t) == UNION_TYPE)
5243 error_with_decl (x, "flexible array member in union");
5244 else if (TREE_CHAIN (x) != NULL_TREE)
5245 error_with_decl (x, "flexible array member not at end of struct");
5246 else if (! saw_named_field)
5247 error_with_decl (x, "flexible array member in otherwise empty struct");
5250 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5251 && flexible_array_type_p (TREE_TYPE (x)))
5252 pedwarn_with_decl (x, "invalid use of structure with flexible array member");
5255 saw_named_field = 1;
5258 /* Delete all duplicate fields from the fieldlist */
5259 for (x = fieldlist; x && TREE_CHAIN (x);)
5260 /* Anonymous fields aren't duplicates. */
5261 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5269 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5275 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5277 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5278 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5284 /* Now we have the nearly final fieldlist. Record it,
5285 then lay out the structure or union (including the fields). */
5287 TYPE_FIELDS (t) = fieldlist;
5291 /* Delete all zero-width bit-fields from the fieldlist */
5293 tree *fieldlistp = &fieldlist;
5295 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5296 *fieldlistp = TREE_CHAIN (*fieldlistp);
5298 fieldlistp = &TREE_CHAIN (*fieldlistp);
5301 /* Now we have the truly final field list.
5302 Store it in this type and in the variants. */
5304 TYPE_FIELDS (t) = fieldlist;
5306 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5308 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5309 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5310 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5311 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5314 /* If this was supposed to be a transparent union, but we can't
5315 make it one, warn and turn off the flag. */
5316 if (TREE_CODE (t) == UNION_TYPE
5317 && TYPE_TRANSPARENT_UNION (t)
5318 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5320 TYPE_TRANSPARENT_UNION (t) = 0;
5321 warning ("union cannot be made transparent");
5324 /* If this structure or union completes the type of any previous
5325 variable declaration, lay it out and output its rtl. */
5327 if (current_binding_level->incomplete_list != NULL_TREE)
5329 tree prev = NULL_TREE;
5331 for (x = current_binding_level->incomplete_list; x; x = TREE_CHAIN (x))
5333 tree decl = TREE_VALUE (x);
5335 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5336 && TREE_CODE (decl) != TYPE_DECL)
5338 layout_decl (decl, 0);
5339 /* This is a no-op in c-lang.c or something real in objc-act.c. */
5341 objc_check_decl (decl);
5342 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5345 /* Unlink X from the incomplete list. */
5347 TREE_CHAIN (prev) = TREE_CHAIN (x);
5349 current_binding_level->incomplete_list = TREE_CHAIN (x);
5351 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5352 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5354 tree element = TREE_TYPE (decl);
5355 while (TREE_CODE (element) == ARRAY_TYPE)
5356 element = TREE_TYPE (element);
5359 layout_array_type (TREE_TYPE (decl));
5360 if (TREE_CODE (decl) != TYPE_DECL)
5362 layout_decl (decl, 0);
5364 objc_check_decl (decl);
5365 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5369 /* Unlink X from the incomplete list. */
5371 TREE_CHAIN (prev) = TREE_CHAIN (x);
5373 current_binding_level->incomplete_list = TREE_CHAIN (x);
5379 /* Finish debugging output for this type. */
5380 rest_of_type_compilation (t, toplevel);
5385 /* Lay out the type T, and its element type, and so on. */
5388 layout_array_type (t)
5391 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5392 layout_array_type (TREE_TYPE (t));
5396 /* Begin compiling the definition of an enumeration type.
5397 NAME is its name (or null if anonymous).
5398 Returns the type object, as yet incomplete.
5399 Also records info about it so that build_enumerator
5400 may be used to declare the individual values as they are read. */
5408 /* If this is the real definition for a previous forward reference,
5409 fill in the contents in the same object that used to be the
5410 forward reference. */
5413 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5415 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5417 enumtype = make_node (ENUMERAL_TYPE);
5418 pushtag (name, enumtype);
5421 C_TYPE_BEING_DEFINED (enumtype) = 1;
5423 if (TYPE_VALUES (enumtype) != 0)
5425 /* This enum is a named one that has been declared already. */
5426 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5428 /* Completely replace its old definition.
5429 The old enumerators remain defined, however. */
5430 TYPE_VALUES (enumtype) = 0;
5433 enum_next_value = integer_zero_node;
5436 if (flag_short_enums)
5437 TYPE_PACKED (enumtype) = 1;
5442 /* After processing and defining all the values of an enumeration type,
5443 install their decls in the enumeration type and finish it off.
5444 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5445 and ATTRIBUTES are the specified attributes.
5446 Returns ENUMTYPE. */
5449 finish_enum (enumtype, values, attributes)
5455 tree minnode = 0, maxnode = 0, enum_value_type;
5456 int precision, unsign;
5457 int toplevel = (global_binding_level == current_binding_level);
5459 if (in_parm_level_p ())
5460 warning ("enum defined inside parms");
5462 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5464 /* Calculate the maximum value of any enumerator in this type. */
5466 if (values == error_mark_node)
5467 minnode = maxnode = integer_zero_node;
5470 minnode = maxnode = TREE_VALUE (values);
5471 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5473 tree value = TREE_VALUE (pair);
5474 if (tree_int_cst_lt (maxnode, value))
5476 if (tree_int_cst_lt (value, minnode))
5481 /* Construct the final type of this enumeration. It is the same
5482 as one of the integral types - the narrowest one that fits, except
5483 that normally we only go as narrow as int - and signed iff any of
5484 the values are negative. */
5485 unsign = (tree_int_cst_sgn (minnode) >= 0);
5486 precision = MAX (min_precision (minnode, unsign),
5487 min_precision (maxnode, unsign));
5488 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5490 tree narrowest = c_common_type_for_size (precision, unsign);
5493 warning ("enumeration values exceed range of largest integer");
5494 narrowest = long_long_integer_type_node;
5497 precision = TYPE_PRECISION (narrowest);
5500 precision = TYPE_PRECISION (integer_type_node);
5502 if (precision == TYPE_PRECISION (integer_type_node))
5503 enum_value_type = c_common_type_for_size (precision, 0);
5505 enum_value_type = enumtype;
5507 TYPE_MIN_VALUE (enumtype) = minnode;
5508 TYPE_MAX_VALUE (enumtype) = maxnode;
5509 TYPE_PRECISION (enumtype) = precision;
5510 TREE_UNSIGNED (enumtype) = unsign;
5511 TYPE_SIZE (enumtype) = 0;
5512 layout_type (enumtype);
5514 if (values != error_mark_node)
5516 /* Change the type of the enumerators to be the enum type. We
5517 need to do this irrespective of the size of the enum, for
5518 proper type checking. Replace the DECL_INITIALs of the
5519 enumerators, and the value slots of the list, with copies
5520 that have the enum type; they cannot be modified in place
5521 because they may be shared (e.g. integer_zero_node) Finally,
5522 change the purpose slots to point to the names of the decls. */
5523 for (pair = values; pair; pair = TREE_CHAIN (pair))
5525 tree enu = TREE_PURPOSE (pair);
5527 TREE_TYPE (enu) = enumtype;
5528 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5529 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5530 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5531 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5532 DECL_MODE (enu) = TYPE_MODE (enumtype);
5534 /* The ISO C Standard mandates enumerators to have type int,
5535 even though the underlying type of an enum type is
5536 unspecified. Here we convert any enumerators that fit in
5537 an int to type int, to avoid promotions to unsigned types
5538 when comparing integers with enumerators that fit in the
5539 int range. When -pedantic is given, build_enumerator()
5540 would have already taken care of those that don't fit. */
5541 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5542 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5544 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5546 TREE_PURPOSE (pair) = DECL_NAME (enu);
5547 TREE_VALUE (pair) = DECL_INITIAL (enu);
5550 TYPE_VALUES (enumtype) = values;
5553 /* Fix up all variant types of this enum type. */
5554 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5556 if (tem == enumtype)
5558 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5559 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5560 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5561 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5562 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5563 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5564 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5565 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5566 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5567 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5570 /* Finish debugging output for this type. */
5571 rest_of_type_compilation (enumtype, toplevel);
5576 /* Build and install a CONST_DECL for one value of the
5577 current enumeration type (one that was begun with start_enum).
5578 Return a tree-list containing the CONST_DECL and its value.
5579 Assignment of sequential values by default is handled here. */
5582 build_enumerator (name, value)
5587 /* Validate and default VALUE. */
5589 /* Remove no-op casts from the value. */
5591 STRIP_TYPE_NOPS (value);
5595 if (TREE_CODE (value) == INTEGER_CST)
5597 value = default_conversion (value);
5598 constant_expression_warning (value);
5602 error ("enumerator value for `%s' not integer constant",
5603 IDENTIFIER_POINTER (name));
5608 /* Default based on previous value. */
5609 /* It should no longer be possible to have NON_LVALUE_EXPR
5613 value = enum_next_value;
5615 error ("overflow in enumeration values");
5618 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5620 pedwarn ("ISO C restricts enumerator values to range of `int'");
5621 value = convert (integer_type_node, value);
5624 /* Set basis for default for next value. */
5625 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5626 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5628 /* Now create a declaration for the enum value name. */
5630 type = TREE_TYPE (value);
5631 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5632 TYPE_PRECISION (integer_type_node)),
5633 (TYPE_PRECISION (type)
5634 >= TYPE_PRECISION (integer_type_node)
5635 && TREE_UNSIGNED (type)));
5637 decl = build_decl (CONST_DECL, name, type);
5638 DECL_INITIAL (decl) = convert (type, value);
5641 return tree_cons (decl, value, NULL_TREE);
5645 /* Create the FUNCTION_DECL for a function definition.
5646 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5647 the declaration; they describe the function's name and the type it returns,
5648 but twisted together in a fashion that parallels the syntax of C.
5650 This function creates a binding context for the function body
5651 as well as setting up the FUNCTION_DECL in current_function_decl.
5653 Returns 1 on success. If the DECLARATOR is not suitable for a function
5654 (it defines a datum instead), we return 0, which tells
5655 yyparse to report a parse error. */
5658 start_function (declspecs, declarator, attributes)
5659 tree declarator, declspecs, attributes;
5661 tree decl1, old_decl;
5663 int old_immediate_size_expand = immediate_size_expand;
5665 current_function_returns_value = 0; /* Assume, until we see it does. */
5666 current_function_returns_null = 0;
5667 current_function_returns_abnormally = 0;
5668 warn_about_return_type = 0;
5669 current_extern_inline = 0;
5671 shadowed_labels = 0;
5673 /* Don't expand any sizes in the return type of the function. */
5674 immediate_size_expand = 0;
5676 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5678 /* If the declarator is not suitable for a function definition,
5679 cause a syntax error. */
5682 immediate_size_expand = old_immediate_size_expand;
5686 decl_attributes (&decl1, attributes, 0);
5688 /* If #pragma weak was used, mark the decl weak now. */
5689 if (current_binding_level == global_binding_level)
5690 maybe_apply_pragma_weak (decl1);
5692 if (DECL_DECLARED_INLINE_P (decl1)
5693 && DECL_UNINLINABLE (decl1)
5694 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5695 warning_with_decl (decl1,
5696 "inline function `%s' given attribute noinline");
5698 announce_function (decl1);
5700 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5702 error ("return type is an incomplete type");
5703 /* Make it return void instead. */
5705 = build_function_type (void_type_node,
5706 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5709 if (warn_about_return_type)
5710 pedwarn_c99 ("return type defaults to `int'");
5712 /* Save the parm names or decls from this function's declarator
5713 where store_parm_decls will find them. */
5714 current_function_parms = last_function_parms;
5715 current_function_parm_tags = last_function_parm_tags;
5717 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5718 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5719 DECL_INITIAL (decl1) = error_mark_node;
5721 /* If this definition isn't a prototype and we had a prototype declaration
5722 before, copy the arg type info from that prototype.
5723 But not if what we had before was a builtin function. */
5724 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5725 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5726 && !DECL_BUILT_IN (old_decl)
5727 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5728 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5729 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5731 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5732 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5733 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5736 /* If there is no explicit declaration, look for any out-of-scope implicit
5739 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5741 /* Optionally warn of old-fashioned def with no previous prototype. */
5742 if (warn_strict_prototypes
5743 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5745 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
5746 || (DECL_BUILT_IN (old_decl)
5747 && ! C_DECL_ANTICIPATED (old_decl)))))
5748 warning ("function declaration isn't a prototype");
5749 /* Optionally warn of any global def with no previous prototype. */
5750 else if (warn_missing_prototypes
5751 && TREE_PUBLIC (decl1)
5753 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
5754 || (DECL_BUILT_IN (old_decl)
5755 && ! C_DECL_ANTICIPATED (old_decl))))
5756 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5757 warning_with_decl (decl1, "no previous prototype for `%s'");
5758 /* Optionally warn of any def with no previous prototype
5759 if the function has already been used. */
5760 else if (warn_missing_prototypes
5761 && old_decl != 0 && TREE_USED (old_decl)
5762 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5763 warning_with_decl (decl1,
5764 "`%s' was used with no prototype before its definition");
5765 /* Optionally warn of any global def with no previous declaration. */
5766 else if (warn_missing_declarations
5767 && TREE_PUBLIC (decl1)
5769 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5770 warning_with_decl (decl1, "no previous declaration for `%s'");
5771 /* Optionally warn of any def with no previous declaration
5772 if the function has already been used. */
5773 else if (warn_missing_declarations
5774 && old_decl != 0 && TREE_USED (old_decl)
5775 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5776 warning_with_decl (decl1,
5777 "`%s' was used with no declaration before its definition");
5779 /* This is a definition, not a reference.
5780 So normally clear DECL_EXTERNAL.
5781 However, `extern inline' acts like a declaration
5782 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5783 DECL_EXTERNAL (decl1) = current_extern_inline;
5785 /* This function exists in static storage.
5786 (This does not mean `static' in the C sense!) */
5787 TREE_STATIC (decl1) = 1;
5789 /* A nested function is not global. */
5790 if (current_function_decl != 0)
5791 TREE_PUBLIC (decl1) = 0;
5793 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5794 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5799 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5800 != integer_type_node)
5801 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5803 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5804 args = TREE_CHAIN (args))
5806 tree type = args ? TREE_VALUE (args) : 0;
5808 if (type == void_type_node)
5815 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5816 pedwarn_with_decl (decl1,
5817 "first argument of `%s' should be `int'");
5821 if (TREE_CODE (type) != POINTER_TYPE
5822 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5823 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5825 pedwarn_with_decl (decl1,
5826 "second argument of `%s' should be `char **'");
5830 if (TREE_CODE (type) != POINTER_TYPE
5831 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5832 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5834 pedwarn_with_decl (decl1,
5835 "third argument of `%s' should probably be `char **'");
5840 /* It is intentional that this message does not mention the third
5841 argument because it's only mentioned in an appendix of the
5843 if (argct > 0 && (argct < 2 || argct > 3))
5844 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5846 if (! TREE_PUBLIC (decl1))
5847 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5850 /* Record the decl so that the function name is defined.
5851 If we already have a decl for this name, and it is a FUNCTION_DECL,
5852 use the old decl. */
5854 current_function_decl = pushdecl (decl1);
5857 declare_parm_level (1);
5858 current_binding_level->subblocks_tag_transparent = 1;
5860 make_decl_rtl (current_function_decl, NULL);
5862 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5863 /* Promote the value to int before returning it. */
5864 if (c_promoting_integer_type_p (restype))
5866 /* It retains unsignedness if not really getting wider. */
5867 if (TREE_UNSIGNED (restype)
5868 && (TYPE_PRECISION (restype)
5869 == TYPE_PRECISION (integer_type_node)))
5870 restype = unsigned_type_node;
5872 restype = integer_type_node;
5874 DECL_RESULT (current_function_decl)
5875 = build_decl (RESULT_DECL, NULL_TREE, restype);
5877 /* If this fcn was already referenced via a block-scope `extern' decl
5878 (or an implicit decl), propagate certain information about the usage. */
5879 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5880 TREE_ADDRESSABLE (current_function_decl) = 1;
5882 immediate_size_expand = old_immediate_size_expand;
5884 start_fname_decls ();
5889 /* Store the parameter declarations into the current function declaration.
5890 This is called after parsing the parameter declarations, before
5891 digesting the body of the function.
5893 For an old-style definition, modify the function's type
5894 to specify at least the number of arguments. */
5899 tree fndecl = current_function_decl;
5902 /* This is either a chain of PARM_DECLs (if a prototype was used)
5903 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5904 tree specparms = current_function_parms;
5906 /* This is a list of types declared among parms in a prototype. */
5907 tree parmtags = current_function_parm_tags;
5909 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5910 tree parmdecls = getdecls ();
5912 /* This is a chain of any other decls that came in among the parm
5913 declarations. If a parm is declared with enum {foo, bar} x;
5914 then CONST_DECLs for foo and bar are put here. */
5917 /* The function containing FNDECL, if any. */
5918 tree context = decl_function_context (fndecl);
5920 /* Nonzero if this definition is written with a prototype. */
5923 int saved_warn_shadow = warn_shadow;
5925 /* Don't re-emit shadow warnings. */
5928 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5930 /* This case is when the function was defined with an ANSI prototype.
5931 The parms already have decls, so we need not do anything here
5932 except record them as in effect
5933 and complain if any redundant old-style parm decls were written. */
5944 error_with_decl (fndecl,
5945 "parm types given both in parmlist and separately");
5946 /* Get rid of the erroneous decls; don't keep them on
5947 the list of parms, since they might not be PARM_DECLs. */
5948 for (decl = current_binding_level->names;
5949 decl; decl = TREE_CHAIN (decl))
5950 if (DECL_NAME (decl))
5951 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5952 for (link = current_binding_level->shadowed;
5953 link; link = TREE_CHAIN (link))
5954 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5955 current_binding_level->names = 0;
5956 current_binding_level->shadowed = 0;
5959 specparms = nreverse (specparms);
5960 for (parm = specparms; parm; parm = next)
5962 next = TREE_CHAIN (parm);
5963 if (TREE_CODE (parm) == PARM_DECL)
5965 if (DECL_NAME (parm) == 0)
5966 error_with_decl (parm, "parameter name omitted");
5967 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
5968 && VOID_TYPE_P (TREE_TYPE (parm)))
5970 error_with_decl (parm, "parameter `%s' declared void");
5971 /* Change the type to error_mark_node so this parameter
5972 will be ignored by assign_parms. */
5973 TREE_TYPE (parm) = error_mark_node;
5979 /* If we find an enum constant or a type tag,
5980 put it aside for the moment. */
5981 TREE_CHAIN (parm) = 0;
5982 others = chainon (others, parm);
5986 /* Get the decls in their original chain order
5987 and record in the function. */
5988 DECL_ARGUMENTS (fndecl) = getdecls ();
5991 /* If this function takes a variable number of arguments,
5992 add a phony parameter to the end of the parm list,
5993 to represent the position of the first unnamed argument. */
5994 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5997 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5998 /* Let's hope the address of the unnamed parm
5999 won't depend on its type. */
6000 TREE_TYPE (dummy) = integer_type_node;
6001 DECL_ARG_TYPE (dummy) = integer_type_node;
6002 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6006 /* Now pushdecl the enum constants. */
6007 for (parm = others; parm; parm = next)
6009 next = TREE_CHAIN (parm);
6010 if (DECL_NAME (parm) == 0)
6012 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6014 else if (TREE_CODE (parm) != PARM_DECL)
6018 storetags (chainon (parmtags, gettags ()));
6022 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6023 each with a parm name as the TREE_VALUE.
6025 PARMDECLS is a chain of declarations for parameters.
6026 Warning! It can also contain CONST_DECLs which are not parameters
6027 but are names of enumerators of any enum types
6028 declared among the parameters.
6030 First match each formal parameter name with its declaration.
6031 Associate decls with the names and store the decls
6032 into the TREE_PURPOSE slots. */
6034 /* We use DECL_WEAK as a flag to show which parameters have been
6035 seen already since it is not used on PARM_DECL or CONST_DECL. */
6036 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6037 DECL_WEAK (parm) = 0;
6039 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6041 tree tail, found = NULL;
6043 if (TREE_VALUE (parm) == 0)
6045 error_with_decl (fndecl,
6046 "parameter name missing from parameter list");
6047 TREE_PURPOSE (parm) = 0;
6051 /* See if any of the parmdecls specifies this parm by name.
6052 Ignore any enumerator decls. */
6053 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6054 if (DECL_NAME (tail) == TREE_VALUE (parm)
6055 && TREE_CODE (tail) == PARM_DECL)
6061 /* If declaration already marked, we have a duplicate name.
6062 Complain, and don't use this decl twice. */
6063 if (found && DECL_WEAK (found))
6065 error_with_decl (found, "multiple parameters named `%s'");
6069 /* If the declaration says "void", complain and ignore it. */
6070 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6072 error_with_decl (found, "parameter `%s' declared void");
6073 TREE_TYPE (found) = integer_type_node;
6074 DECL_ARG_TYPE (found) = integer_type_node;
6075 layout_decl (found, 0);
6078 /* If no declaration found, default to int. */
6081 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6083 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6084 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6085 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6087 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6088 else if (extra_warnings)
6089 warning_with_decl (found, "type of `%s' defaults to `int'");
6093 TREE_PURPOSE (parm) = found;
6095 /* Mark this decl as "already found". */
6096 DECL_WEAK (found) = 1;
6099 /* Put anything which is on the parmdecls chain and which is
6100 not a PARM_DECL onto the list NONPARMS. (The types of
6101 non-parm things which might appear on the list include
6102 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6103 any actual PARM_DECLs not matched with any names. */
6106 for (parm = parmdecls; parm;)
6108 tree next = TREE_CHAIN (parm);
6109 TREE_CHAIN (parm) = 0;
6111 if (TREE_CODE (parm) != PARM_DECL)
6112 nonparms = chainon (nonparms, parm);
6115 /* Complain about args with incomplete types. */
6116 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6118 error_with_decl (parm, "parameter `%s' has incomplete type");
6119 TREE_TYPE (parm) = error_mark_node;
6122 if (! DECL_WEAK (parm))
6124 error_with_decl (parm,
6125 "declaration for parameter `%s' but no such parameter");
6126 /* Pretend the parameter was not missing.
6127 This gets us to a standard state and minimizes
6128 further error messages. */
6130 = chainon (specparms,
6131 tree_cons (parm, NULL_TREE, NULL_TREE));
6138 /* Chain the declarations together in the order of the list of
6139 names. Store that chain in the function decl, replacing the
6142 DECL_ARGUMENTS (fndecl) = 0;
6145 for (last = 0; parm; parm = TREE_CHAIN (parm))
6146 if (TREE_PURPOSE (parm))
6149 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6151 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6152 last = TREE_PURPOSE (parm);
6153 TREE_CHAIN (last) = 0;
6157 /* If there was a previous prototype,
6158 set the DECL_ARG_TYPE of each argument according to
6159 the type previously specified, and report any mismatches. */
6161 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6164 for (parm = DECL_ARGUMENTS (fndecl),
6165 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6166 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6167 != void_type_node));
6168 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6170 if (parm == 0 || type == 0
6171 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6173 error ("number of arguments doesn't match prototype");
6174 error_with_file_and_line (current_function_prototype_file,
6175 current_function_prototype_line,
6176 "prototype declaration");
6179 /* Type for passing arg must be consistent with that
6180 declared for the arg. ISO C says we take the unqualified
6181 type for parameters declared with qualified type. */
6182 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6183 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6185 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6186 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6188 /* Adjust argument to match prototype. E.g. a previous
6189 `int foo(float);' prototype causes
6190 `int foo(x) float x; {...}' to be treated like
6191 `int foo(float x) {...}'. This is particularly
6192 useful for argument types like uid_t. */
6193 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6195 if (PROMOTE_PROTOTYPES
6196 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6197 && TYPE_PRECISION (TREE_TYPE (parm))
6198 < TYPE_PRECISION (integer_type_node))
6199 DECL_ARG_TYPE (parm) = integer_type_node;
6203 pedwarn ("promoted argument `%s' doesn't match prototype",
6204 IDENTIFIER_POINTER (DECL_NAME (parm)));
6205 warning_with_file_and_line
6206 (current_function_prototype_file,
6207 current_function_prototype_line,
6208 "prototype declaration");
6213 error ("argument `%s' doesn't match prototype",
6214 IDENTIFIER_POINTER (DECL_NAME (parm)));
6215 error_with_file_and_line (current_function_prototype_file,
6216 current_function_prototype_line,
6217 "prototype declaration");
6221 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6224 /* Otherwise, create a prototype that would match. */
6228 tree actual = 0, last = 0, type;
6230 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6232 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6234 TREE_CHAIN (last) = type;
6239 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6241 TREE_CHAIN (last) = type;
6245 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6246 of the type of this function, but we need to avoid having this
6247 affect the types of other similarly-typed functions, so we must
6248 first force the generation of an identical (but separate) type
6249 node for the relevant function type. The new node we create
6250 will be a variant of the main variant of the original function
6253 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6255 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6258 /* Now store the final chain of decls for the arguments
6259 as the decl-chain of the current lexical scope.
6260 Put the enumerators in as well, at the front so that
6261 DECL_ARGUMENTS is not modified. */
6263 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6266 /* Make sure the binding level for the top of the function body
6267 gets a BLOCK if there are any in the function.
6268 Otherwise, the dbx output is wrong. */
6270 keep_next_if_subblocks = 1;
6272 /* ??? This might be an improvement,
6273 but needs to be thought about some more. */
6275 keep_next_level_flag = 1;
6278 /* Write a record describing this function definition to the prototypes
6279 file (if requested). */
6281 gen_aux_info_record (fndecl, 1, 0, prototype);
6283 /* Initialize the RTL code for the function. */
6284 init_function_start (fndecl, input_filename, lineno);
6286 /* Begin the statement tree for this function. */
6287 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6289 /* If this is a nested function, save away the sizes of any
6290 variable-size types so that we can expand them when generating
6296 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6297 = nreverse (get_pending_sizes ());
6298 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6301 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6304 /* This function is being processed in whole-function mode. */
6305 cfun->x_whole_function_mode_p = 1;
6307 /* Even though we're inside a function body, we still don't want to
6308 call expand_expr to calculate the size of a variable-sized array.
6309 We haven't necessarily assigned RTL to all variables yet, so it's
6310 not safe to try to expand expressions involving them. */
6311 immediate_size_expand = 0;
6312 cfun->x_dont_save_pending_sizes_p = 1;
6314 warn_shadow = saved_warn_shadow;
6317 /* Finish up a function declaration and compile that function
6318 all the way to assembler language output. The free the storage
6319 for the function definition.
6321 This is called after parsing the body of the function definition.
6323 NESTED is nonzero if the function being finished is nested in another.
6324 CAN_DEFER_P is nonzero if the function may be deferred. */
6327 finish_function (nested, can_defer_p)
6331 tree fndecl = current_function_decl;
6334 /* This caused &foo to be of type ptr-to-const-function which then
6335 got a warning when stored in a ptr-to-function variable. */
6336 TREE_READONLY (fndecl) = 1;
6340 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6342 /* Must mark the RESULT_DECL as being in this function. */
6344 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6346 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6348 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6349 != integer_type_node)
6351 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6352 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6354 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6358 #ifdef DEFAULT_MAIN_RETURN
6359 /* Make it so that `main' always returns success by default. */
6360 DEFAULT_MAIN_RETURN;
6363 c_expand_return (integer_zero_node);
6368 finish_fname_decls ();
6370 /* Tie off the statement tree for this function. */
6371 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6373 /* Complain if there's just no return statement. */
6374 if (warn_return_type
6375 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6376 && !current_function_returns_value && !current_function_returns_null
6377 /* Don't complain if we abort. */
6378 && !current_function_returns_abnormally
6379 /* Don't warn for main(). */
6380 && !MAIN_NAME_P (DECL_NAME (fndecl))
6381 /* Or if they didn't actually specify a return type. */
6382 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6383 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6384 inline function, as we might never be compiled separately. */
6385 && DECL_INLINE (fndecl))
6386 warning ("no return statement in function returning non-void");
6388 /* Clear out memory we no longer need. */
6389 free_after_parsing (cfun);
6390 /* Since we never call rest_of_compilation, we never clear
6391 CFUN. Do so explicitly. */
6392 free_after_compilation (cfun);
6397 /* Generate RTL for the body of this function. */
6398 c_expand_body (fndecl, nested, can_defer_p);
6400 /* Let the error reporting routines know that we're outside a
6401 function. For a nested function, this value is used in
6402 c_pop_function_context and then reset via pop_function_context. */
6403 current_function_decl = NULL;
6407 /* Generate the RTL for a deferred function FNDECL. */
6410 c_expand_deferred_function (fndecl)
6413 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6414 function was deferred, e.g. in duplicate_decls. */
6415 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6417 c_expand_body (fndecl, 0, 0);
6418 current_function_decl = NULL;
6422 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6423 then we are already in the process of generating RTL for another
6424 function. If can_defer_p is zero, we won't attempt to defer the
6425 generation of RTL. */
6428 c_expand_body (fndecl, nested_p, can_defer_p)
6430 int nested_p, can_defer_p;
6432 int uninlinable = 1;
6434 /* There's no reason to do any of the work here if we're only doing
6435 semantic analysis; this code just generates RTL. */
6436 if (flag_syntax_only)
6439 if (flag_inline_trees)
6441 /* First, cache whether the current function is inlinable. Some
6442 predicates depend on cfun and current_function_decl to
6443 function completely. */
6444 timevar_push (TV_INTEGRATION);
6445 uninlinable = ! tree_inlinable_function_p (fndecl);
6447 if (! uninlinable && can_defer_p
6448 /* Save function tree for inlining. Should return 0 if the
6449 language does not support function deferring or the
6450 function could not be deferred. */
6451 && defer_fn (fndecl))
6453 /* Let the back-end know that this function exists. */
6454 (*debug_hooks->deferred_inline_function) (fndecl);
6455 timevar_pop (TV_INTEGRATION);
6459 /* Then, inline any functions called in it. */
6460 optimize_inline_calls (fndecl);
6461 timevar_pop (TV_INTEGRATION);
6464 timevar_push (TV_EXPAND);
6468 /* Make sure that we will evaluate variable-sized types involved
6469 in our function's type. */
6470 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6471 /* Squirrel away our current state. */
6472 push_function_context ();
6475 /* Initialize the RTL code for the function. */
6476 current_function_decl = fndecl;
6477 input_filename = DECL_SOURCE_FILE (fndecl);
6478 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6480 /* This function is being processed in whole-function mode. */
6481 cfun->x_whole_function_mode_p = 1;
6483 /* Even though we're inside a function body, we still don't want to
6484 call expand_expr to calculate the size of a variable-sized array.
6485 We haven't necessarily assigned RTL to all variables yet, so it's
6486 not safe to try to expand expressions involving them. */
6487 immediate_size_expand = 0;
6488 cfun->x_dont_save_pending_sizes_p = 1;
6490 /* Set up parameters and prepare for return, for the function. */
6491 expand_function_start (fndecl, 0);
6493 /* If this function is `main', emit a call to `__main'
6494 to run global initializers, etc. */
6495 if (DECL_NAME (fndecl)
6496 && MAIN_NAME_P (DECL_NAME (fndecl))
6497 && DECL_CONTEXT (fndecl) == NULL_TREE)
6498 expand_main_function ();
6500 /* Generate the RTL for this function. */
6501 expand_stmt (DECL_SAVED_TREE (fndecl));
6504 /* Allow the body of the function to be garbage collected. */
6505 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6508 /* We hard-wired immediate_size_expand to zero above.
6509 expand_function_end will decrement this variable. So, we set the
6510 variable to one here, so that after the decrement it will remain
6512 immediate_size_expand = 1;
6514 /* Allow language dialects to perform special processing. */
6515 if (lang_expand_function_end)
6516 (*lang_expand_function_end) ();
6518 /* Generate rtl for function exit. */
6519 expand_function_end (input_filename, lineno, 0);
6521 /* If this is a nested function, protect the local variables in the stack
6522 above us from being collected while we're compiling this function. */
6524 ggc_push_context ();
6526 /* Run the optimizers and output the assembler code for this function. */
6527 rest_of_compilation (fndecl);
6529 /* Undo the GC context switch. */
6533 /* With just -W, complain only if function returns both with
6534 and without a value. */
6536 && current_function_returns_value
6537 && current_function_returns_null)
6538 warning ("this function may return with or without a value");
6540 /* If requested, warn about function definitions where the function will
6541 return a value (usually of some struct or union type) which itself will
6542 take up a lot of stack space. */
6544 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6546 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6548 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6549 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6550 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6553 unsigned int size_as_int
6554 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6556 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6557 warning_with_decl (fndecl,
6558 "size of return value of `%s' is %u bytes",
6561 warning_with_decl (fndecl,
6562 "size of return value of `%s' is larger than %d bytes",
6567 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6568 && ! flag_inline_trees)
6570 /* Stop pointing to the local nodes about to be freed.
6571 But DECL_INITIAL must remain nonzero so we know this
6572 was an actual function definition.
6573 For a nested function, this is done in c_pop_function_context.
6574 If rest_of_compilation set this to 0, leave it 0. */
6575 if (DECL_INITIAL (fndecl) != 0)
6576 DECL_INITIAL (fndecl) = error_mark_node;
6578 DECL_ARGUMENTS (fndecl) = 0;
6581 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6583 if (targetm.have_ctors_dtors)
6584 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6585 DEFAULT_INIT_PRIORITY);
6587 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6590 if (DECL_STATIC_DESTRUCTOR (fndecl))
6592 if (targetm.have_ctors_dtors)
6593 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6594 DEFAULT_INIT_PRIORITY);
6596 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6600 /* Return to the enclosing function. */
6601 pop_function_context ();
6602 timevar_pop (TV_EXPAND);
6605 /* Check the declarations given in a for-loop for satisfying the C99
6608 check_for_loop_decls ()
6614 /* If we get here, declarations have been used in a for loop without
6615 the C99 for loop scope. This doesn't make much sense, so don't
6617 error ("`for' loop initial declaration used outside C99 mode");
6620 /* C99 subclause 6.8.5 paragraph 3:
6622 [#3] The declaration part of a for statement shall only
6623 declare identifiers for objects having storage class auto or
6626 It isn't clear whether, in this sentence, "identifiers" binds to
6627 "shall only declare" or to "objects" - that is, whether all identifiers
6628 declared must be identifiers for objects, or whether the restriction
6629 only applies to those that are. (A question on this in comp.std.c
6630 in November 2000 received no answer.) We implement the strictest
6631 interpretation, to avoid creating an extension which later causes
6634 for (t = gettags (); t; t = TREE_CHAIN (t))
6636 if (TREE_PURPOSE (t) != 0)
6638 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6640 if (code == RECORD_TYPE)
6641 error ("`struct %s' declared in `for' loop initial declaration",
6642 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6643 else if (code == UNION_TYPE)
6644 error ("`union %s' declared in `for' loop initial declaration",
6645 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6647 error ("`enum %s' declared in `for' loop initial declaration",
6648 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6652 for (t = getdecls (); t; t = TREE_CHAIN (t))
6654 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6655 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6656 else if (TREE_STATIC (t))
6657 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6658 else if (DECL_EXTERNAL (t))
6659 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6663 /* Save and restore the variables in this file and elsewhere
6664 that keep track of the progress of compilation of the current function.
6665 Used for nested functions. */
6667 struct language_function GTY(())
6669 struct c_language_function base;
6671 tree shadowed_labels;
6674 int returns_abnormally;
6675 int warn_about_return_type;
6677 struct binding_level *binding_level;
6680 /* Save and reinitialize the variables
6681 used during compilation of a C function. */
6684 c_push_function_context (f)
6687 struct language_function *p;
6688 p = ((struct language_function *)
6689 ggc_alloc (sizeof (struct language_function)));
6692 p->base.x_stmt_tree = c_stmt_tree;
6693 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6694 p->named_labels = named_labels;
6695 p->shadowed_labels = shadowed_labels;
6696 p->returns_value = current_function_returns_value;
6697 p->returns_null = current_function_returns_null;
6698 p->returns_abnormally = current_function_returns_abnormally;
6699 p->warn_about_return_type = warn_about_return_type;
6700 p->extern_inline = current_extern_inline;
6701 p->binding_level = current_binding_level;
6704 /* Restore the variables used during compilation of a C function. */
6707 c_pop_function_context (f)
6710 struct language_function *p = f->language;
6713 /* Bring back all the labels that were shadowed. */
6714 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6715 if (DECL_NAME (TREE_VALUE (link)) != 0)
6716 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6717 = TREE_VALUE (link);
6719 if (DECL_SAVED_INSNS (current_function_decl) == 0
6720 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6722 /* Stop pointing to the local nodes about to be freed. */
6723 /* But DECL_INITIAL must remain nonzero so we know this
6724 was an actual function definition. */
6725 DECL_INITIAL (current_function_decl) = error_mark_node;
6726 DECL_ARGUMENTS (current_function_decl) = 0;
6729 c_stmt_tree = p->base.x_stmt_tree;
6730 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6731 named_labels = p->named_labels;
6732 shadowed_labels = p->shadowed_labels;
6733 current_function_returns_value = p->returns_value;
6734 current_function_returns_null = p->returns_null;
6735 current_function_returns_abnormally = p->returns_abnormally;
6736 warn_about_return_type = p->warn_about_return_type;
6737 current_extern_inline = p->extern_inline;
6738 current_binding_level = p->binding_level;
6743 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6746 c_dup_lang_specific_decl (decl)
6749 struct lang_decl *ld;
6751 if (!DECL_LANG_SPECIFIC (decl))
6754 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
6755 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
6756 sizeof (struct lang_decl));
6757 DECL_LANG_SPECIFIC (decl) = ld;
6760 /* The functions below are required for functionality of doing
6761 function at once processing in the C front end. Currently these
6762 functions are not called from anywhere in the C front end, but as
6763 these changes continue, that will change. */
6765 /* Returns nonzero if the current statement is a full expression,
6766 i.e. temporaries created during that statement should be destroyed
6767 at the end of the statement. */
6770 stmts_are_full_exprs_p ()
6775 /* Returns the stmt_tree (if any) to which statements are currently
6776 being added. If there is no active statement-tree, NULL is
6780 current_stmt_tree ()
6782 return &c_stmt_tree;
6785 /* Returns the stack of SCOPE_STMTs for the current function. */
6788 current_scope_stmt_stack ()
6790 return &c_scope_stmt_stack;
6793 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6797 anon_aggr_type_p (node)
6798 tree node ATTRIBUTE_UNUSED;
6803 /* Dummy function in place of callback used by C++. */
6806 extract_interface_info ()
6810 /* Return a new COMPOUND_STMT, after adding it to the current
6814 c_begin_compound_stmt ()
6818 /* Create the COMPOUND_STMT. */
6819 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6824 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6828 c_expand_decl_stmt (t)
6831 tree decl = DECL_STMT_DECL (t);
6833 /* Expand nested functions. */
6834 if (TREE_CODE (decl) == FUNCTION_DECL
6835 && DECL_CONTEXT (decl) == current_function_decl
6836 && DECL_SAVED_TREE (decl))
6837 c_expand_body (decl, /*nested_p=*/1, /*can_defer_p=*/0);
6840 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
6841 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
6844 identifier_global_value (t)
6847 return IDENTIFIER_GLOBAL_VALUE (t);
6850 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6851 otherwise the name is found in ridpointers from RID_INDEX. */
6854 record_builtin_type (rid_index, name, type)
6861 id = ridpointers[(int) rid_index];
6863 id = get_identifier (name);
6864 pushdecl (build_decl (TYPE_DECL, id, type));
6867 /* Build the void_list_node (void_type_node having been created). */
6869 build_void_list_node ()
6871 tree t = build_tree_list (NULL_TREE, void_type_node);
6875 /* Return something to represent absolute declarators containing a *.
6876 TARGET is the absolute declarator that the * contains.
6877 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6878 to apply to the pointer type, represented as identifiers, possible mixed
6881 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6882 if attributes are present) and whose type is the modifier list. */
6885 make_pointer_declarator (type_quals_attrs, target)
6886 tree type_quals_attrs, target;
6889 tree itarget = target;
6890 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6891 if (attrs != NULL_TREE)
6892 itarget = tree_cons (attrs, target, NULL_TREE);
6893 return build1 (INDIRECT_REF, quals, itarget);
6896 #include "gt-c-decl.h"