1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
36 #include "tree-inline.h"
53 #include "langhooks.h"
54 #include "tree-mudflap.h"
55 #include "tree-gimple.h"
56 #include "diagnostic.h"
57 #include "tree-dump.h"
62 #include "langhooks-def.h"
64 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
66 { NORMAL, /* Ordinary declaration */
67 FUNCDEF, /* Function definition */
68 PARM, /* Declaration of parm before function body */
69 FIELD, /* Declaration inside struct or union */
70 TYPENAME}; /* Typename (inside cast or sizeof) */
73 /* Nonzero if we have seen an invalid cross reference
74 to a struct, union, or enum, but not yet printed the message. */
75 tree pending_invalid_xref;
77 /* File and line to appear in the eventual error message. */
78 location_t pending_invalid_xref_location;
80 /* True means we've initialized exception handling. */
81 bool c_eh_initialized_p;
83 /* While defining an enum type, this is 1 plus the last enumerator
84 constant value. Note that will do not have to save this or `enum_overflow'
85 around nested function definition since such a definition could only
86 occur in an enum value expression and we don't use these variables in
89 static tree enum_next_value;
91 /* Nonzero means that there was overflow computing enum_next_value. */
93 static int enum_overflow;
95 /* The file and line that the prototype came from if this is an
96 old-style definition; used for diagnostics in
97 store_parm_decls_oldstyle. */
99 static location_t current_function_prototype_locus;
101 /* The argument information structure for the function currently being
104 static struct c_arg_info *current_function_arg_info;
106 /* The obstack on which parser and related data structures, which are
107 not live beyond their top-level declaration or definition, are
109 struct obstack parser_obstack;
111 /* The current statement tree. */
113 static GTY(()) struct stmt_tree_s c_stmt_tree;
115 /* State saving variables. */
119 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
120 included in this invocation. Note that the current translation
121 unit is not included in this list. */
123 static GTY(()) tree all_translation_units;
125 /* A list of decls to be made automatically visible in each file scope. */
126 static GTY(()) tree visible_builtins;
128 /* Set to 0 at beginning of a function definition, set to 1 if
129 a return statement that specifies a return value is seen. */
131 int current_function_returns_value;
133 /* Set to 0 at beginning of a function definition, set to 1 if
134 a return statement with no argument is seen. */
136 int current_function_returns_null;
138 /* Set to 0 at beginning of a function definition, set to 1 if
139 a call to a noreturn function is seen. */
141 int current_function_returns_abnormally;
143 /* Set to nonzero by `grokdeclarator' for a function
144 whose return type is defaulted, if warnings for this are desired. */
146 static int warn_about_return_type;
148 /* Nonzero when starting a function declared `extern inline'. */
150 static int current_extern_inline;
152 /* Nonzero when the current toplevel function contains a declaration
153 of a nested function which is never defined. */
155 static bool undef_nested_function;
157 /* True means global_bindings_p should return false even if the scope stack
158 says we are in file scope. */
159 bool c_override_global_bindings_to_false;
162 /* Each c_binding structure describes one binding of an identifier to
163 a decl. All the decls in a scope - irrespective of namespace - are
164 chained together by the ->prev field, which (as the name implies)
165 runs in reverse order. All the decls in a given namespace bound to
166 a given identifier are chained by the ->shadowed field, which runs
167 from inner to outer scopes.
169 The ->decl field usually points to a DECL node, but there are two
170 exceptions. In the namespace of type tags, the bound entity is a
171 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
172 identifier is encountered, it is bound to error_mark_node to
173 suppress further errors about that identifier in the current
176 The ->type field stores the type of the declaration in this scope;
177 if NULL, the type is the type of the ->decl field. This is only of
178 relevance for objects with external or internal linkage which may
179 be redeclared in inner scopes, forming composite types that only
180 persist for the duration of those scopes. In the external scope,
181 this stores the composite of all the types declared for this
182 object, visible or not. The ->inner_comp field (used only at file
183 scope) stores whether an incomplete array type at file scope was
184 completed at an inner scope to an array size other than 1.
186 The depth field is copied from the scope structure that holds this
187 decl. It is used to preserve the proper ordering of the ->shadowed
188 field (see bind()) and also for a handful of special-case checks.
189 Finally, the invisible bit is true for a decl which should be
190 ignored for purposes of normal name lookup, and the nested bit is
191 true for a decl that's been bound a second time in an inner scope;
192 in all such cases, the binding in the outer scope will have its
193 invisible bit true. */
195 struct c_binding GTY((chain_next ("%h.prev")))
197 tree decl; /* the decl bound */
198 tree type; /* the type in this scope */
199 tree id; /* the identifier it's bound to */
200 struct c_binding *prev; /* the previous decl in this scope */
201 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
202 unsigned int depth : 28; /* depth of this scope */
203 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
204 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
205 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
208 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
209 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
210 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
211 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
213 #define I_SYMBOL_BINDING(node) \
214 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
215 #define I_SYMBOL_DECL(node) \
216 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
218 #define I_TAG_BINDING(node) \
219 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
220 #define I_TAG_DECL(node) \
221 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
223 #define I_LABEL_BINDING(node) \
224 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
225 #define I_LABEL_DECL(node) \
226 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
228 /* Each C symbol points to three linked lists of c_binding structures.
229 These describe the values of the identifier in the three different
230 namespaces defined by the language. */
232 struct lang_identifier GTY(())
234 struct c_common_identifier common_id;
235 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
236 struct c_binding *tag_binding; /* struct/union/enum tags */
237 struct c_binding *label_binding; /* labels */
240 /* Validate c-lang.c's assumptions. */
241 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
242 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
244 /* The resulting tree type. */
247 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
248 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : (union lang_tree_node *) TREE_CHAIN (&%h.generic)")))
250 union tree_node GTY ((tag ("0"),
251 desc ("tree_node_structure (&%h)")))
253 struct lang_identifier GTY ((tag ("1"))) identifier;
256 /* Each c_scope structure describes the complete contents of one
257 scope. Four scopes are distinguished specially: the innermost or
258 current scope, the innermost function scope, the file scope (always
259 the second to outermost) and the outermost or external scope.
261 Most declarations are recorded in the current scope.
263 All normal label declarations are recorded in the innermost
264 function scope, as are bindings of undeclared identifiers to
265 error_mark_node. (GCC permits nested functions as an extension,
266 hence the 'innermost' qualifier.) Explicitly declared labels
267 (using the __label__ extension) appear in the current scope.
269 Being in the file scope (current_scope == file_scope) causes
270 special behavior in several places below. Also, under some
271 conditions the Objective-C front end records declarations in the
272 file scope even though that isn't the current scope.
274 All declarations with external linkage are recorded in the external
275 scope, even if they aren't visible there; this models the fact that
276 such declarations are visible to the entire program, and (with a
277 bit of cleverness, see pushdecl) allows diagnosis of some violations
278 of C99 6.2.2p7 and 6.2.7p2:
280 If, within the same translation unit, the same identifier appears
281 with both internal and external linkage, the behavior is
284 All declarations that refer to the same object or function shall
285 have compatible type; otherwise, the behavior is undefined.
287 Initially only the built-in declarations, which describe compiler
288 intrinsic functions plus a subset of the standard library, are in
291 The order of the blocks list matters, and it is frequently appended
292 to. To avoid having to walk all the way to the end of the list on
293 each insertion, or reverse the list later, we maintain a pointer to
294 the last list entry. (FIXME: It should be feasible to use a reversed
297 The bindings list is strictly in reverse order of declarations;
298 pop_scope relies on this. */
301 struct c_scope GTY((chain_next ("%h.outer")))
303 /* The scope containing this one. */
304 struct c_scope *outer;
306 /* The next outermost function scope. */
307 struct c_scope *outer_function;
309 /* All bindings in this scope. */
310 struct c_binding *bindings;
312 /* For each scope (except the global one), a chain of BLOCK nodes
313 for all the scopes that were entered and exited one level down. */
317 /* The depth of this scope. Used to keep the ->shadowed chain of
318 bindings sorted innermost to outermost. */
319 unsigned int depth : 28;
321 /* True if we are currently filling this scope with parameter
323 BOOL_BITFIELD parm_flag : 1;
325 /* True if we already complained about forward parameter decls
326 in this scope. This prevents double warnings on
327 foo (int a; int b; ...) */
328 BOOL_BITFIELD warned_forward_parm_decls : 1;
330 /* True if this is the outermost block scope of a function body.
331 This scope contains the parameters, the local variables declared
332 in the outermost block, and all the labels (except those in
333 nested functions, or declared at block scope with __label__). */
334 BOOL_BITFIELD function_body : 1;
336 /* True means make a BLOCK for this scope no matter what. */
337 BOOL_BITFIELD keep : 1;
340 /* The scope currently in effect. */
342 static GTY(()) struct c_scope *current_scope;
344 /* The innermost function scope. Ordinary (not explicitly declared)
345 labels, bindings to error_mark_node, and the lazily-created
346 bindings of __func__ and its friends get this scope. */
348 static GTY(()) struct c_scope *current_function_scope;
350 /* The C file scope. This is reset for each input translation unit. */
352 static GTY(()) struct c_scope *file_scope;
354 /* The outermost scope. This is used for all declarations with
355 external linkage, and only these, hence the name. */
357 static GTY(()) struct c_scope *external_scope;
359 /* A chain of c_scope structures awaiting reuse. */
361 static GTY((deletable)) struct c_scope *scope_freelist;
363 /* A chain of c_binding structures awaiting reuse. */
365 static GTY((deletable)) struct c_binding *binding_freelist;
367 /* Append VAR to LIST in scope SCOPE. */
368 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
369 struct c_scope *s_ = (scope); \
371 if (s_->list##_last) \
372 TREE_CHAIN (s_->list##_last) = d_; \
375 s_->list##_last = d_; \
378 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
379 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
380 struct c_scope *t_ = (tscope); \
381 struct c_scope *f_ = (fscope); \
383 TREE_CHAIN (t_->to##_last) = f_->from; \
386 t_->to##_last = f_->from##_last; \
389 /* True means unconditionally make a BLOCK for the next scope pushed. */
391 static bool keep_next_level_flag;
393 /* True means the next call to push_scope will be the outermost scope
394 of a function body, so do not push a new scope, merely cease
395 expecting parameter decls. */
397 static bool next_is_function_body;
399 /* Functions called automatically at the beginning and end of execution. */
401 static GTY(()) tree static_ctors;
402 static GTY(()) tree static_dtors;
404 /* Forward declarations. */
405 static tree lookup_name_in_scope (tree, struct c_scope *);
406 static tree c_make_fname_decl (tree, int);
407 static tree grokdeclarator (const struct c_declarator *,
408 struct c_declspecs *,
409 enum decl_context, bool, tree *);
410 static tree grokparms (struct c_arg_info *, bool);
411 static void layout_array_type (tree);
413 /* States indicating how grokdeclarator() should handle declspecs marked
414 with __attribute__((deprecated)). An object declared as
415 __attribute__((deprecated)) suppresses warnings of uses of other
418 enum deprecated_states {
423 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
426 c_print_identifier (FILE *file, tree node, int indent)
428 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
429 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
430 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
431 if (C_IS_RESERVED_WORD (node))
433 tree rid = ridpointers[C_RID_CODE (node)];
434 indent_to (file, indent + 4);
435 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
436 (void *) rid, IDENTIFIER_POINTER (rid));
440 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
441 which may be any of several kinds of DECL or TYPE or error_mark_node,
442 in the scope SCOPE. */
444 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
446 struct c_binding *b, **here;
448 if (binding_freelist)
450 b = binding_freelist;
451 binding_freelist = b->prev;
454 b = GGC_NEW (struct c_binding);
459 b->depth = scope->depth;
460 b->invisible = invisible;
466 b->prev = scope->bindings;
472 switch (TREE_CODE (decl))
474 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
477 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
483 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
489 /* Locate the appropriate place in the chain of shadowed decls
490 to insert this binding. Normally, scope == current_scope and
491 this does nothing. */
492 while (*here && (*here)->depth > scope->depth)
493 here = &(*here)->shadowed;
499 /* Clear the binding structure B, stick it on the binding_freelist,
500 and return the former value of b->prev. This is used by pop_scope
501 and get_parm_info to iterate destructively over all the bindings
502 from a given scope. */
503 static struct c_binding *
504 free_binding_and_advance (struct c_binding *b)
506 struct c_binding *prev = b->prev;
508 memset (b, 0, sizeof (struct c_binding));
509 b->prev = binding_freelist;
510 binding_freelist = b;
516 /* Hook called at end of compilation to assume 1 elt
517 for a file-scope tentative array defn that wasn't complete before. */
520 c_finish_incomplete_decl (tree decl)
522 if (TREE_CODE (decl) == VAR_DECL)
524 tree type = TREE_TYPE (decl);
525 if (type != error_mark_node
526 && TREE_CODE (type) == ARRAY_TYPE
527 && !DECL_EXTERNAL (decl)
528 && TYPE_DOMAIN (type) == 0)
530 warning ("%Jarray %qD assumed to have one element", decl, decl);
532 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
534 layout_decl (decl, 0);
539 /* The Objective-C front-end often needs to determine the current scope. */
542 objc_get_current_scope (void)
544 return current_scope;
547 /* The following function is used only by Objective-C. It needs to live here
548 because it accesses the innards of c_scope. */
551 objc_mark_locals_volatile (void *enclosing_blk)
553 struct c_scope *scope;
556 for (scope = current_scope;
557 scope && scope != enclosing_blk;
558 scope = scope->outer)
560 for (b = scope->bindings; b; b = b->prev)
562 if (TREE_CODE (b->decl) == VAR_DECL
563 || TREE_CODE (b->decl) == PARM_DECL)
565 C_DECL_REGISTER (b->decl) = 0;
566 DECL_REGISTER (b->decl) = 0;
567 TREE_THIS_VOLATILE (b->decl) = 1;
571 /* Do not climb up past the current function. */
572 if (scope->function_body)
577 /* Nonzero if we are currently in file scope. */
580 global_bindings_p (void)
582 return current_scope == file_scope && !c_override_global_bindings_to_false;
586 keep_next_level (void)
588 keep_next_level_flag = true;
591 /* Identify this scope as currently being filled with parameters. */
594 declare_parm_level (void)
596 current_scope->parm_flag = true;
602 if (next_is_function_body)
604 /* This is the transition from the parameters to the top level
605 of the function body. These are the same scope
606 (C99 6.2.1p4,6) so we do not push another scope structure.
607 next_is_function_body is set only by store_parm_decls, which
608 in turn is called when and only when we are about to
609 encounter the opening curly brace for the function body.
611 The outermost block of a function always gets a BLOCK node,
612 because the debugging output routines expect that each
613 function has at least one BLOCK. */
614 current_scope->parm_flag = false;
615 current_scope->function_body = true;
616 current_scope->keep = true;
617 current_scope->outer_function = current_function_scope;
618 current_function_scope = current_scope;
620 keep_next_level_flag = false;
621 next_is_function_body = false;
625 struct c_scope *scope;
628 scope = scope_freelist;
629 scope_freelist = scope->outer;
632 scope = GGC_CNEW (struct c_scope);
634 scope->keep = keep_next_level_flag;
635 scope->outer = current_scope;
636 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
638 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
640 if (current_scope && scope->depth == 0)
643 sorry ("GCC supports only %u nested scopes", scope->depth);
646 current_scope = scope;
647 keep_next_level_flag = false;
651 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
654 set_type_context (tree type, tree context)
656 for (type = TYPE_MAIN_VARIANT (type); type;
657 type = TYPE_NEXT_VARIANT (type))
658 TYPE_CONTEXT (type) = context;
661 /* Exit a scope. Restore the state of the identifier-decl mappings
662 that were in effect when this scope was entered. Return a BLOCK
663 node containing all the DECLs in this scope that are of interest
664 to debug info generation. */
669 struct c_scope *scope = current_scope;
670 tree block, context, p;
673 bool functionbody = scope->function_body;
674 bool keep = functionbody || scope->keep || scope->bindings;
676 /* If appropriate, create a BLOCK to record the decls for the life
681 block = make_node (BLOCK);
682 BLOCK_SUBBLOCKS (block) = scope->blocks;
683 TREE_USED (block) = 1;
685 /* In each subblock, record that this is its superior. */
686 for (p = scope->blocks; p; p = TREE_CHAIN (p))
687 BLOCK_SUPERCONTEXT (p) = block;
689 BLOCK_VARS (block) = 0;
692 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
693 scope must be set so that they point to the appropriate
694 construct, i.e. either to the current FUNCTION_DECL node, or
695 else to the BLOCK node we just constructed.
697 Note that for tagged types whose scope is just the formal
698 parameter list for some function type specification, we can't
699 properly set their TYPE_CONTEXTs here, because we don't have a
700 pointer to the appropriate FUNCTION_TYPE node readily available
701 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
702 type nodes get set in `grokdeclarator' as soon as we have created
703 the FUNCTION_TYPE node which will represent the "scope" for these
704 "parameter list local" tagged types. */
705 if (scope->function_body)
706 context = current_function_decl;
707 else if (scope == file_scope)
709 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
710 TREE_CHAIN (file_decl) = all_translation_units;
711 all_translation_units = file_decl;
717 /* Clear all bindings in this scope. */
718 for (b = scope->bindings; b; b = free_binding_and_advance (b))
721 switch (TREE_CODE (p))
724 /* Warnings for unused labels, errors for undefined labels. */
725 if (TREE_USED (p) && !DECL_INITIAL (p))
727 error ("%Jlabel %qD used but not defined", p, p);
728 DECL_INITIAL (p) = error_mark_node;
730 else if (!TREE_USED (p) && warn_unused_label)
732 if (DECL_INITIAL (p))
733 warning ("%Jlabel %qD defined but not used", p, p);
735 warning ("%Jlabel %qD declared but not defined", p, p);
737 /* Labels go in BLOCK_VARS. */
738 TREE_CHAIN (p) = BLOCK_VARS (block);
739 BLOCK_VARS (block) = p;
740 gcc_assert (I_LABEL_BINDING (b->id) == b);
741 I_LABEL_BINDING (b->id) = b->shadowed;
747 set_type_context (p, context);
749 /* Types may not have tag-names, in which case the type
750 appears in the bindings list with b->id NULL. */
753 gcc_assert (I_TAG_BINDING (b->id) == b);
754 I_TAG_BINDING (b->id) = b->shadowed;
759 /* Propagate TREE_ADDRESSABLE from nested functions to their
760 containing functions. */
761 if (!TREE_ASM_WRITTEN (p)
762 && DECL_INITIAL (p) != 0
763 && TREE_ADDRESSABLE (p)
764 && DECL_ABSTRACT_ORIGIN (p) != 0
765 && DECL_ABSTRACT_ORIGIN (p) != p)
766 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
767 if (!DECL_EXTERNAL (p)
768 && DECL_INITIAL (p) == 0)
770 error ("%Jnested function %qD declared but never defined", p, p);
771 undef_nested_function = true;
776 /* Warnings for unused variables. */
777 if (warn_unused_variable
779 && !DECL_IN_SYSTEM_HEADER (p)
781 && !DECL_ARTIFICIAL (p)
782 && scope != file_scope
783 && scope != external_scope)
784 warning ("%Junused variable %qD", p, p);
788 error ("%Jtype of array %qD completed incompatibly with"
789 " implicit initialization", p, p);
796 /* All of these go in BLOCK_VARS, but only if this is the
797 binding in the home scope. */
800 TREE_CHAIN (p) = BLOCK_VARS (block);
801 BLOCK_VARS (block) = p;
803 /* If this is the file scope, and we are processing more
804 than one translation unit in this compilation, set
805 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
806 This makes same_translation_unit_p work, and causes
807 static declarations to be given disambiguating suffixes. */
808 if (scope == file_scope && num_in_fnames > 1)
810 DECL_CONTEXT (p) = context;
811 if (TREE_CODE (p) == TYPE_DECL)
812 set_type_context (TREE_TYPE (p), context);
816 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
817 already been put there by store_parm_decls. Unused-
818 parameter warnings are handled by function.c.
819 error_mark_node obviously does not go in BLOCK_VARS and
820 does not get unused-variable warnings. */
823 /* It is possible for a decl not to have a name. We get
824 here with b->id NULL in this case. */
827 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
828 I_SYMBOL_BINDING (b->id) = b->shadowed;
829 if (b->shadowed && b->shadowed->type)
830 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
840 /* Dispose of the block that we just made inside some higher level. */
841 if ((scope->function_body || scope == file_scope) && context)
843 DECL_INITIAL (context) = block;
844 BLOCK_SUPERCONTEXT (block) = context;
846 else if (scope->outer)
849 SCOPE_LIST_APPEND (scope->outer, blocks, block);
850 /* If we did not make a block for the scope just exited, any
851 blocks made for inner scopes must be carried forward so they
852 will later become subblocks of something else. */
853 else if (scope->blocks)
854 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
857 /* Pop the current scope, and free the structure for reuse. */
858 current_scope = scope->outer;
859 if (scope->function_body)
860 current_function_scope = scope->outer_function;
862 memset (scope, 0, sizeof (struct c_scope));
863 scope->outer = scope_freelist;
864 scope_freelist = scope;
870 push_file_scope (void)
878 file_scope = current_scope;
880 start_fname_decls ();
882 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
883 bind (DECL_NAME (decl), decl, file_scope,
884 /*invisible=*/false, /*nested=*/true);
888 pop_file_scope (void)
890 /* In case there were missing closebraces, get us back to the global
892 while (current_scope != file_scope)
895 /* __FUNCTION__ is defined at file scope (""). This
896 call may not be necessary as my tests indicate it
897 still works without it. */
898 finish_fname_decls ();
900 /* This is the point to write out a PCH if we're doing that.
901 In that case we do not want to do anything else. */
904 c_common_write_pch ();
908 /* Pop off the file scope and close this translation unit. */
912 maybe_apply_pending_pragma_weaks ();
913 cgraph_finalize_compilation_unit ();
916 /* Insert BLOCK at the end of the list of subblocks of the current
917 scope. This is used when a BIND_EXPR is expanded, to handle the
918 BLOCK node inside the BIND_EXPR. */
921 insert_block (tree block)
923 TREE_USED (block) = 1;
924 SCOPE_LIST_APPEND (current_scope, blocks, block);
927 /* Push a definition or a declaration of struct, union or enum tag "name".
928 "type" should be the type node.
929 We assume that the tag "name" is not already defined.
931 Note that the definition may really be just a forward reference.
932 In that case, the TYPE_SIZE will be zero. */
935 pushtag (tree name, tree type)
937 /* Record the identifier as the type's name if it has none. */
938 if (name && !TYPE_NAME (type))
939 TYPE_NAME (type) = name;
940 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
942 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
943 tagged type we just added to the current scope. This fake
944 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
945 to output a representation of a tagged type, and it also gives
946 us a convenient place to record the "scope start" address for the
949 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
951 /* An approximation for now, so we can tell this is a function-scope tag.
952 This will be updated in pop_scope. */
953 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
956 /* Subroutine of compare_decls. Allow harmless mismatches in return
957 and argument types provided that the type modes match. This function
958 return a unified type given a suitable match, and 0 otherwise. */
961 match_builtin_function_types (tree newtype, tree oldtype)
963 tree newrettype, oldrettype;
964 tree newargs, oldargs;
965 tree trytype, tryargs;
967 /* Accept the return type of the new declaration if same modes. */
968 oldrettype = TREE_TYPE (oldtype);
969 newrettype = TREE_TYPE (newtype);
971 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
974 oldargs = TYPE_ARG_TYPES (oldtype);
975 newargs = TYPE_ARG_TYPES (newtype);
978 while (oldargs || newargs)
982 || !TREE_VALUE (oldargs)
983 || !TREE_VALUE (newargs)
984 || TYPE_MODE (TREE_VALUE (oldargs))
985 != TYPE_MODE (TREE_VALUE (newargs)))
988 oldargs = TREE_CHAIN (oldargs);
989 newargs = TREE_CHAIN (newargs);
992 trytype = build_function_type (newrettype, tryargs);
993 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
996 /* Subroutine of diagnose_mismatched_decls. Check for function type
997 mismatch involving an empty arglist vs a nonempty one and give clearer
1000 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1001 tree newtype, tree oldtype)
1005 if (TREE_CODE (olddecl) != FUNCTION_DECL
1006 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1007 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1009 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1012 t = TYPE_ARG_TYPES (oldtype);
1014 t = TYPE_ARG_TYPES (newtype);
1015 for (; t; t = TREE_CHAIN (t))
1017 tree type = TREE_VALUE (t);
1019 if (TREE_CHAIN (t) == 0
1020 && TYPE_MAIN_VARIANT (type) != void_type_node)
1022 inform ("a parameter list with an ellipsis can%'t match "
1023 "an empty parameter name list declaration");
1027 if (c_type_promotes_to (type) != type)
1029 inform ("an argument type that has a default promotion can%'t match "
1030 "an empty parameter name list declaration");
1036 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1037 old-style function definition, NEWDECL is a prototype declaration.
1038 Diagnose inconsistencies in the argument list. Returns TRUE if
1039 the prototype is compatible, FALSE if not. */
1041 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1043 tree newargs, oldargs;
1046 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
1047 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
1049 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1050 newargs = TYPE_ARG_TYPES (newtype);
1055 tree oldargtype = TREE_VALUE (oldargs);
1056 tree newargtype = TREE_VALUE (newargs);
1058 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1061 /* Reaching the end of just one list means the two decls don't
1062 agree on the number of arguments. */
1063 if (END_OF_ARGLIST (oldargtype))
1065 error ("%Jprototype for %qD declares more arguments "
1066 "than previous old-style definition", newdecl, newdecl);
1069 else if (END_OF_ARGLIST (newargtype))
1071 error ("%Jprototype for %qD declares fewer arguments "
1072 "than previous old-style definition", newdecl, newdecl);
1076 /* Type for passing arg must be consistent with that declared
1078 else if (!comptypes (oldargtype, newargtype))
1080 error ("%Jprototype for %qD declares argument %d"
1081 " with incompatible type",
1082 newdecl, newdecl, i);
1086 oldargs = TREE_CHAIN (oldargs);
1087 newargs = TREE_CHAIN (newargs);
1091 /* If we get here, no errors were found, but do issue a warning
1092 for this poor-style construct. */
1093 warning ("%Jprototype for %qD follows non-prototype definition",
1096 #undef END_OF_ARGLIST
1099 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1100 first in a pair of mismatched declarations, using the diagnostic
1103 locate_old_decl (tree decl, void (*diag)(const char *, ...))
1105 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1107 else if (DECL_INITIAL (decl))
1108 diag (N_("%Jprevious definition of %qD was here"), decl, decl);
1109 else if (C_DECL_IMPLICIT (decl))
1110 diag (N_("%Jprevious implicit declaration of %qD was here"), decl, decl);
1112 diag (N_("%Jprevious declaration of %qD was here"), decl, decl);
1115 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1116 Returns true if the caller should proceed to merge the two, false
1117 if OLDDECL should simply be discarded. As a side effect, issues
1118 all necessary diagnostics for invalid or poor-style combinations.
1119 If it returns true, writes the types of NEWDECL and OLDDECL to
1120 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1121 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1124 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1125 tree *newtypep, tree *oldtypep)
1127 tree newtype, oldtype;
1128 bool pedwarned = false;
1129 bool warned = false;
1132 /* If we have error_mark_node for either decl or type, just discard
1133 the previous decl - we're in an error cascade already. */
1134 if (olddecl == error_mark_node || newdecl == error_mark_node)
1136 *oldtypep = oldtype = TREE_TYPE (olddecl);
1137 *newtypep = newtype = TREE_TYPE (newdecl);
1138 if (oldtype == error_mark_node || newtype == error_mark_node)
1141 /* Two different categories of symbol altogether. This is an error
1142 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1143 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1145 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1146 && DECL_BUILT_IN (olddecl)
1147 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1149 error ("%J%qD redeclared as different kind of symbol",
1151 locate_old_decl (olddecl, error);
1153 else if (TREE_PUBLIC (newdecl))
1154 warning ("%Jbuilt-in function %qD declared as non-function",
1156 else if (warn_shadow)
1157 warning ("%Jdeclaration of %qD shadows a built-in function",
1162 /* Enumerators have no linkage, so may only be declared once in a
1164 if (TREE_CODE (olddecl) == CONST_DECL)
1166 error ("%Jredeclaration of enumerator %qD", newdecl, newdecl);
1167 locate_old_decl (olddecl, error);
1171 if (!comptypes (oldtype, newtype))
1173 if (TREE_CODE (olddecl) == FUNCTION_DECL
1174 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1176 /* Accept harmless mismatch in function types.
1177 This is for the ffs and fprintf builtins. */
1178 tree trytype = match_builtin_function_types (newtype, oldtype);
1180 if (trytype && comptypes (newtype, trytype))
1181 *oldtypep = oldtype = trytype;
1184 /* If types don't match for a built-in, throw away the
1185 built-in. No point in calling locate_old_decl here, it
1186 won't print anything. */
1187 warning ("%Jconflicting types for built-in function %qD",
1192 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1193 && DECL_IS_BUILTIN (olddecl))
1195 /* A conflicting function declaration for a predeclared
1196 function that isn't actually built in. Objective C uses
1197 these. The new declaration silently overrides everything
1198 but the volatility (i.e. noreturn) indication. See also
1199 below. FIXME: Make Objective C use normal builtins. */
1200 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1203 /* Permit void foo (...) to match int foo (...) if the latter is
1204 the definition and implicit int was used. See
1205 c-torture/compile/920625-2.c. */
1206 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1207 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1208 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1209 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1211 pedwarn ("%Jconflicting types for %qD", newdecl, newdecl);
1212 /* Make sure we keep void as the return type. */
1213 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1214 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1217 /* Permit void foo (...) to match an earlier call to foo (...) with
1218 no declared type (thus, implicitly int). */
1219 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1220 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1221 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1222 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1224 pedwarn ("%Jconflicting types for %qD", newdecl, newdecl);
1225 /* Make sure we keep void as the return type. */
1226 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1231 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1232 error ("%J conflicting type qualifiers for %qD", newdecl, newdecl);
1234 error ("%Jconflicting types for %qD", newdecl, newdecl);
1235 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1236 locate_old_decl (olddecl, error);
1241 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1242 but silently ignore the redeclaration if either is in a system
1243 header. (Conflicting redeclarations were handled above.) */
1244 if (TREE_CODE (newdecl) == TYPE_DECL)
1246 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1247 return true; /* Allow OLDDECL to continue in use. */
1249 error ("%Jredefinition of typedef %qD", newdecl, newdecl);
1250 locate_old_decl (olddecl, error);
1254 /* Function declarations can either be 'static' or 'extern' (no
1255 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1256 can never conflict with each other on account of linkage (6.2.2p4).
1257 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1258 two definitions if one is 'extern inline' and one is not. The non-
1259 extern-inline definition supersedes the extern-inline definition. */
1260 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1262 /* If you declare a built-in function name as static, or
1263 define the built-in with an old-style definition (so we
1264 can't validate the argument list) the built-in definition is
1265 overridden, but optionally warn this was a bad choice of name. */
1266 if (DECL_BUILT_IN (olddecl)
1267 && !C_DECL_DECLARED_BUILTIN (olddecl)
1268 && (!TREE_PUBLIC (newdecl)
1269 || (DECL_INITIAL (newdecl)
1270 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1273 warning ("%Jdeclaration of %qD shadows a built-in function",
1275 /* Discard the old built-in function. */
1279 if (DECL_INITIAL (newdecl))
1281 if (DECL_INITIAL (olddecl))
1283 /* If both decls have extern inline and are in the same TU,
1284 reject the new decl. */
1285 if (DECL_DECLARED_INLINE_P (olddecl)
1286 && DECL_EXTERNAL (olddecl)
1287 && DECL_DECLARED_INLINE_P (newdecl)
1288 && DECL_EXTERNAL (newdecl)
1289 && same_translation_unit_p (newdecl, olddecl))
1291 error ("%Jredefinition of %qD", newdecl, newdecl);
1292 locate_old_decl (olddecl, error);
1295 /* If both decls have not extern inline, reject the new decl. */
1296 if (!DECL_DECLARED_INLINE_P (olddecl)
1297 && !DECL_EXTERNAL (olddecl)
1298 && !DECL_DECLARED_INLINE_P (newdecl)
1299 && !DECL_EXTERNAL (newdecl))
1301 error ("%Jredefinition of %qD", newdecl, newdecl);
1302 locate_old_decl (olddecl, error);
1305 /* If the new decl is declared as extern inline, error if they are
1306 in the same TU, otherwise retain the old decl. */
1307 if (!DECL_DECLARED_INLINE_P (olddecl)
1308 && !DECL_EXTERNAL (olddecl)
1309 && DECL_DECLARED_INLINE_P (newdecl)
1310 && DECL_EXTERNAL (newdecl))
1312 if (same_translation_unit_p (newdecl, olddecl))
1314 error ("%Jredefinition of %qD", newdecl, newdecl);
1315 locate_old_decl (olddecl, error);
1323 /* If we have a prototype after an old-style function definition,
1324 the argument types must be checked specially. */
1325 else if (DECL_INITIAL (olddecl)
1326 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1327 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1328 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1330 locate_old_decl (olddecl, error);
1333 /* A non-static declaration (even an "extern") followed by a
1334 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1335 The same is true for a static forward declaration at block
1336 scope followed by a non-static declaration/definition at file
1337 scope. Static followed by non-static at the same scope is
1338 not undefined behavior, and is the most convenient way to get
1339 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1340 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1341 we do diagnose it if -Wtraditional. */
1342 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1344 /* Two exceptions to the rule. If olddecl is an extern
1345 inline, or a predeclared function that isn't actually
1346 built in, newdecl silently overrides olddecl. The latter
1347 occur only in Objective C; see also above. (FIXME: Make
1348 Objective C use normal builtins.) */
1349 if (!DECL_IS_BUILTIN (olddecl)
1350 && !(DECL_EXTERNAL (olddecl)
1351 && DECL_DECLARED_INLINE_P (olddecl)))
1353 error ("%Jstatic declaration of %qD follows "
1354 "non-static declaration", newdecl, newdecl);
1355 locate_old_decl (olddecl, error);
1359 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1361 if (DECL_CONTEXT (olddecl))
1363 error ("%Jnon-static declaration of %qD follows "
1364 "static declaration", newdecl, newdecl);
1365 locate_old_decl (olddecl, error);
1368 else if (warn_traditional)
1370 warning ("%Jnon-static declaration of %qD follows "
1371 "static declaration", newdecl, newdecl);
1376 else if (TREE_CODE (newdecl) == VAR_DECL)
1378 /* Only variables can be thread-local, and all declarations must
1379 agree on this property. */
1380 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1382 if (DECL_THREAD_LOCAL (newdecl))
1383 error ("%Jthread-local declaration of %qD follows "
1384 "non-thread-local declaration", newdecl, newdecl);
1386 error ("%Jnon-thread-local declaration of %qD follows "
1387 "thread-local declaration", newdecl, newdecl);
1389 locate_old_decl (olddecl, error);
1393 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1394 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1396 error ("%Jredefinition of %qD", newdecl, newdecl);
1397 locate_old_decl (olddecl, error);
1401 /* Objects declared at file scope: if the first declaration had
1402 external linkage (even if it was an external reference) the
1403 second must have external linkage as well, or the behavior is
1404 undefined. If the first declaration had internal linkage, then
1405 the second must too, or else be an external reference (in which
1406 case the composite declaration still has internal linkage).
1407 As for function declarations, we warn about the static-then-
1408 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1409 if (DECL_FILE_SCOPE_P (newdecl)
1410 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1412 if (DECL_EXTERNAL (newdecl))
1414 if (!DECL_FILE_SCOPE_P (olddecl))
1416 error ("%Jextern declaration of %qD follows "
1417 "declaration with no linkage", newdecl, newdecl);
1418 locate_old_decl (olddecl, error);
1421 else if (warn_traditional)
1423 warning ("%Jnon-static declaration of %qD follows "
1424 "static declaration", newdecl, newdecl);
1430 if (TREE_PUBLIC (newdecl))
1431 error ("%Jnon-static declaration of %qD follows "
1432 "static declaration", newdecl, newdecl);
1434 error ("%Jstatic declaration of %qD follows "
1435 "non-static declaration", newdecl, newdecl);
1437 locate_old_decl (olddecl, error);
1441 /* Two objects with the same name declared at the same block
1442 scope must both be external references (6.7p3). */
1443 else if (!DECL_FILE_SCOPE_P (newdecl))
1445 if (DECL_EXTERNAL (newdecl))
1447 /* Extern with initializer at block scope, which will
1448 already have received an error. */
1450 else if (DECL_EXTERNAL (olddecl))
1452 error ("%Jdeclaration of %qD with no linkage follows "
1453 "extern declaration", newdecl, newdecl);
1454 locate_old_decl (olddecl, error);
1458 error ("%Jredeclaration of %qD with no linkage",
1460 locate_old_decl (olddecl, error);
1468 /* All decls must agree on a visibility. */
1469 if (DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1470 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1472 warning ("%Jredeclaration of %qD with different visibility "
1473 "(old visibility preserved)", newdecl, newdecl);
1477 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1479 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1480 if (DECL_DECLARED_INLINE_P (newdecl)
1481 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1483 warning ("%Jinline declaration of %qD follows "
1484 "declaration with attribute noinline", newdecl, newdecl);
1487 else if (DECL_DECLARED_INLINE_P (olddecl)
1488 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1490 warning ("%Jdeclaration of %qD with attribute noinline follows "
1491 "inline declaration ", newdecl, newdecl);
1495 /* Inline declaration after use or definition.
1496 ??? Should we still warn about this now we have unit-at-a-time
1497 mode and can get it right?
1498 Definitely don't complain if the decls are in different translation
1500 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1501 && same_translation_unit_p (olddecl, newdecl))
1503 if (TREE_USED (olddecl))
1505 warning ("%J%qD declared inline after being called",
1509 else if (DECL_INITIAL (olddecl))
1511 warning ("%J%qD declared inline after its definition",
1517 else /* PARM_DECL, VAR_DECL */
1519 /* Redeclaration of a parameter is a constraint violation (this is
1520 not explicitly stated, but follows from C99 6.7p3 [no more than
1521 one declaration of the same identifier with no linkage in the
1522 same scope, except type tags] and 6.2.2p6 [parameters have no
1523 linkage]). We must check for a forward parameter declaration,
1524 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1525 an extension, the mandatory diagnostic for which is handled by
1526 mark_forward_parm_decls. */
1528 if (TREE_CODE (newdecl) == PARM_DECL
1529 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1531 error ("%Jredefinition of parameter %qD", newdecl, newdecl);
1532 locate_old_decl (olddecl, error);
1537 /* Optional warning for completely redundant decls. */
1538 if (!warned && !pedwarned
1539 && warn_redundant_decls
1540 /* Don't warn about a function declaration followed by a
1542 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1543 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1544 /* Don't warn about redundant redeclarations of builtins. */
1545 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1546 && !DECL_BUILT_IN (newdecl)
1547 && DECL_BUILT_IN (olddecl)
1548 && !C_DECL_DECLARED_BUILTIN (olddecl))
1549 /* Don't warn about an extern followed by a definition. */
1550 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1551 /* Don't warn about forward parameter decls. */
1552 && !(TREE_CODE (newdecl) == PARM_DECL
1553 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1555 warning ("%Jredundant redeclaration of %qD", newdecl, newdecl);
1559 /* Report location of previous decl/defn in a consistent manner. */
1560 if (warned || pedwarned)
1561 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1566 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1567 consistent with OLDDECL, but carries new information. Merge the
1568 new information into OLDDECL. This function issues no
1572 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1574 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1575 && DECL_INITIAL (newdecl) != 0);
1577 /* For real parm decl following a forward decl, rechain the old decl
1578 in its new location and clear TREE_ASM_WRITTEN (it's not a
1579 forward decl anymore). */
1580 if (TREE_CODE (newdecl) == PARM_DECL
1581 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1583 struct c_binding *b, **here;
1585 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1586 if ((*here)->decl == olddecl)
1593 b->prev = current_scope->bindings;
1594 current_scope->bindings = b;
1596 TREE_ASM_WRITTEN (olddecl) = 0;
1599 DECL_ATTRIBUTES (newdecl)
1600 = targetm.merge_decl_attributes (olddecl, newdecl);
1602 /* Merge the data types specified in the two decls. */
1604 = TREE_TYPE (olddecl)
1605 = composite_type (newtype, oldtype);
1607 /* Lay the type out, unless already done. */
1608 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1610 if (TREE_TYPE (newdecl) != error_mark_node)
1611 layout_type (TREE_TYPE (newdecl));
1612 if (TREE_CODE (newdecl) != FUNCTION_DECL
1613 && TREE_CODE (newdecl) != TYPE_DECL
1614 && TREE_CODE (newdecl) != CONST_DECL)
1615 layout_decl (newdecl, 0);
1619 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1620 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1621 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1622 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1623 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1624 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1626 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1627 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1631 /* Keep the old rtl since we can safely use it. */
1632 COPY_DECL_RTL (olddecl, newdecl);
1634 /* Merge the type qualifiers. */
1635 if (TREE_READONLY (newdecl))
1636 TREE_READONLY (olddecl) = 1;
1638 if (TREE_THIS_VOLATILE (newdecl))
1640 TREE_THIS_VOLATILE (olddecl) = 1;
1641 if (TREE_CODE (newdecl) == VAR_DECL)
1642 make_var_volatile (newdecl);
1645 /* Merge deprecatedness. */
1646 if (TREE_DEPRECATED (newdecl))
1647 TREE_DEPRECATED (olddecl) = 1;
1649 /* Keep source location of definition rather than declaration. */
1650 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1651 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1653 /* Merge the unused-warning information. */
1654 if (DECL_IN_SYSTEM_HEADER (olddecl))
1655 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1656 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1657 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1659 /* Merge the initialization information. */
1660 if (DECL_INITIAL (newdecl) == 0)
1661 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1663 /* Merge the section attribute.
1664 We want to issue an error if the sections conflict but that must be
1665 done later in decl_attributes since we are called before attributes
1667 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1668 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1670 /* Copy the assembler name.
1671 Currently, it can only be defined in the prototype. */
1672 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1674 /* Use visibility of whichever declaration had it specified */
1675 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1677 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1678 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1681 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1683 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1684 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1685 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1686 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1687 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1688 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1689 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1690 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1691 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1692 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1695 /* Merge the storage class information. */
1696 merge_weak (newdecl, olddecl);
1698 /* For functions, static overrides non-static. */
1699 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1701 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1702 /* This is since we don't automatically
1703 copy the attributes of NEWDECL into OLDDECL. */
1704 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1705 /* If this clears `static', clear it in the identifier too. */
1706 if (!TREE_PUBLIC (olddecl))
1707 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1709 if (DECL_EXTERNAL (newdecl))
1711 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1712 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1714 /* An extern decl does not override previous storage class. */
1715 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1716 if (!DECL_EXTERNAL (newdecl))
1718 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1719 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1724 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1725 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1728 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1730 /* If we're redefining a function previously defined as extern
1731 inline, make sure we emit debug info for the inline before we
1732 throw it away, in case it was inlined into a function that hasn't
1733 been written out yet. */
1734 if (new_is_definition && DECL_INITIAL (olddecl))
1736 if (TREE_USED (olddecl)
1737 /* In unit-at-a-time mode we never inline re-defined extern
1738 inline functions. */
1739 && !flag_unit_at_a_time
1740 && cgraph_function_possibly_inlined_p (olddecl))
1741 (*debug_hooks->outlining_inline_function) (olddecl);
1743 /* The new defn must not be inline. */
1744 DECL_INLINE (newdecl) = 0;
1745 DECL_UNINLINABLE (newdecl) = 1;
1749 /* If either decl says `inline', this fn is inline,
1750 unless its definition was passed already. */
1751 if (DECL_DECLARED_INLINE_P (newdecl)
1752 || DECL_DECLARED_INLINE_P (olddecl))
1753 DECL_DECLARED_INLINE_P (newdecl) = 1;
1755 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1756 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1759 if (DECL_BUILT_IN (olddecl))
1761 /* If redeclaring a builtin function, it stays built in.
1762 But it gets tagged as having been declared. */
1763 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1764 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1765 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1768 /* Also preserve various other info from the definition. */
1769 if (!new_is_definition)
1771 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1772 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1773 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1774 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1775 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1777 /* Set DECL_INLINE on the declaration if we've got a body
1778 from which to instantiate. */
1779 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1781 DECL_INLINE (newdecl) = 1;
1782 DECL_ABSTRACT_ORIGIN (newdecl)
1783 = DECL_ABSTRACT_ORIGIN (olddecl);
1788 /* If a previous declaration said inline, mark the
1789 definition as inlinable. */
1790 if (DECL_DECLARED_INLINE_P (newdecl)
1791 && !DECL_UNINLINABLE (newdecl))
1792 DECL_INLINE (newdecl) = 1;
1796 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1797 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1799 unsigned olddecl_uid = DECL_UID (olddecl);
1800 tree olddecl_context = DECL_CONTEXT (olddecl);
1802 memcpy ((char *) olddecl + sizeof (struct tree_common),
1803 (char *) newdecl + sizeof (struct tree_common),
1804 sizeof (struct tree_decl) - sizeof (struct tree_common));
1805 DECL_UID (olddecl) = olddecl_uid;
1806 DECL_CONTEXT (olddecl) = olddecl_context;
1809 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1810 so that encode_section_info has a chance to look at the new decl
1811 flags and attributes. */
1812 if (DECL_RTL_SET_P (olddecl)
1813 && (TREE_CODE (olddecl) == FUNCTION_DECL
1814 || (TREE_CODE (olddecl) == VAR_DECL
1815 && TREE_STATIC (olddecl))))
1816 make_decl_rtl (olddecl);
1819 /* Handle when a new declaration NEWDECL has the same name as an old
1820 one OLDDECL in the same binding contour. Prints an error message
1823 If safely possible, alter OLDDECL to look like NEWDECL, and return
1824 true. Otherwise, return false. */
1827 duplicate_decls (tree newdecl, tree olddecl)
1829 tree newtype = NULL, oldtype = NULL;
1831 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1834 merge_decls (newdecl, olddecl, newtype, oldtype);
1839 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1841 warn_if_shadowing (tree new_decl)
1843 struct c_binding *b;
1845 /* Shadow warnings wanted? */
1847 /* No shadow warnings for internally generated vars. */
1848 || DECL_IS_BUILTIN (new_decl)
1849 /* No shadow warnings for vars made for inlining. */
1850 || DECL_FROM_INLINE (new_decl)
1851 /* Don't warn about the parm names in function declarator
1852 within a function declarator. It would be nice to avoid
1853 warning in any function declarator in a declaration, as
1854 opposed to a definition, but there is no way to tell
1855 it's not a definition at this point. */
1856 || (TREE_CODE (new_decl) == PARM_DECL && current_scope->outer->parm_flag))
1859 /* Is anything being shadowed? Invisible decls do not count. */
1860 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1861 if (b->decl && b->decl != new_decl && !b->invisible)
1863 tree old_decl = b->decl;
1865 if (old_decl == error_mark_node)
1867 warning ("%Jdeclaration of %qD shadows previous non-variable",
1868 new_decl, new_decl);
1871 else if (TREE_CODE (old_decl) == PARM_DECL)
1872 warning ("%Jdeclaration of %qD shadows a parameter",
1873 new_decl, new_decl);
1874 else if (DECL_FILE_SCOPE_P (old_decl))
1875 warning ("%Jdeclaration of %qD shadows a global declaration",
1876 new_decl, new_decl);
1877 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1878 && DECL_BUILT_IN (old_decl))
1880 warning ("%Jdeclaration of %qD shadows a built-in function",
1881 new_decl, new_decl);
1885 warning ("%Jdeclaration of %qD shadows a previous local",
1886 new_decl, new_decl);
1888 warning ("%Jshadowed declaration is here", old_decl);
1895 /* Subroutine of pushdecl.
1897 X is a TYPE_DECL for a typedef statement. Create a brand new
1898 ..._TYPE node (which will be just a variant of the existing
1899 ..._TYPE node with identical properties) and then install X
1900 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1902 The whole point here is to end up with a situation where each
1903 and every ..._TYPE node the compiler creates will be uniquely
1904 associated with AT MOST one node representing a typedef name.
1905 This way, even though the compiler substitutes corresponding
1906 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1907 early on, later parts of the compiler can always do the reverse
1908 translation and get back the corresponding typedef name. For
1911 typedef struct S MY_TYPE;
1914 Later parts of the compiler might only know that `object' was of
1915 type `struct S' if it were not for code just below. With this
1916 code however, later parts of the compiler see something like:
1918 struct S' == struct S
1919 typedef struct S' MY_TYPE;
1922 And they can then deduce (from the node for type struct S') that
1923 the original object declaration was:
1927 Being able to do this is important for proper support of protoize,
1928 and also for generating precise symbolic debugging information
1929 which takes full account of the programmer's (typedef) vocabulary.
1931 Obviously, we don't want to generate a duplicate ..._TYPE node if
1932 the TYPE_DECL node that we are now processing really represents a
1933 standard built-in type.
1935 Since all standard types are effectively declared at line zero
1936 in the source file, we can easily check to see if we are working
1937 on a standard type by checking the current value of lineno. */
1940 clone_underlying_type (tree x)
1942 if (DECL_IS_BUILTIN (x))
1944 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1945 TYPE_NAME (TREE_TYPE (x)) = x;
1947 else if (TREE_TYPE (x) != error_mark_node
1948 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1950 tree tt = TREE_TYPE (x);
1951 DECL_ORIGINAL_TYPE (x) = tt;
1952 tt = build_variant_type_copy (tt);
1954 TREE_USED (tt) = TREE_USED (x);
1959 /* Record a decl-node X as belonging to the current lexical scope.
1960 Check for errors (such as an incompatible declaration for the same
1961 name already seen in the same scope).
1963 Returns either X or an old decl for the same name.
1964 If an old decl is returned, it may have been smashed
1965 to agree with what X says. */
1970 tree name = DECL_NAME (x);
1971 struct c_scope *scope = current_scope;
1972 struct c_binding *b;
1973 bool nested = false;
1975 /* Functions need the lang_decl data. */
1976 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
1977 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
1979 /* Must set DECL_CONTEXT for everything not at file scope or
1980 DECL_FILE_SCOPE_P won't work. Local externs don't count
1981 unless they have initializers (which generate code). */
1982 if (current_function_decl
1983 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
1984 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
1985 DECL_CONTEXT (x) = current_function_decl;
1987 /* Anonymous decls are just inserted in the scope. */
1990 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
1994 /* First, see if there is another declaration with the same name in
1995 the current scope. If there is, duplicate_decls may do all the
1996 work for us. If duplicate_decls returns false, that indicates
1997 two incompatible decls in the same scope; we are to silently
1998 replace the old one (duplicate_decls has issued all appropriate
1999 diagnostics). In particular, we should not consider possible
2000 duplicates in the external scope, or shadowing. */
2001 b = I_SYMBOL_BINDING (name);
2002 if (b && B_IN_SCOPE (b, scope))
2004 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2005 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2006 b->inner_comp = false;
2007 if (duplicate_decls (x, b->decl))
2010 goto skip_external_and_shadow_checks;
2013 /* All declarations with external linkage, and all external
2014 references, go in the external scope, no matter what scope is
2015 current. However, the binding in that scope is ignored for
2016 purposes of normal name lookup. A separate binding structure is
2017 created in the requested scope; this governs the normal
2018 visibility of the symbol.
2020 The binding in the externals scope is used exclusively for
2021 detecting duplicate declarations of the same object, no matter
2022 what scope they are in; this is what we do here. (C99 6.2.7p2:
2023 All declarations that refer to the same object or function shall
2024 have compatible type; otherwise, the behavior is undefined.) */
2025 if (DECL_EXTERNAL (x) || scope == file_scope)
2027 tree type = TREE_TYPE (x);
2030 bool type_saved = false;
2031 if (b && !B_IN_EXTERNAL_SCOPE (b)
2032 && (TREE_CODE (b->decl) == FUNCTION_DECL
2033 || TREE_CODE (b->decl) == VAR_DECL)
2034 && DECL_FILE_SCOPE_P (b->decl))
2037 vistype = TREE_TYPE (visdecl);
2039 if (warn_nested_externs
2040 && scope != file_scope
2041 && !DECL_IN_SYSTEM_HEADER (x))
2042 warning ("nested extern declaration of %qD", x);
2044 while (b && !B_IN_EXTERNAL_SCOPE (b))
2046 /* If this decl might be modified, save its type. This is
2047 done here rather than when the decl is first bound
2048 because the type may change after first binding, through
2049 being completed or through attributes being added. If we
2050 encounter multiple such decls, only the first should have
2051 its type saved; the others will already have had their
2052 proper types saved and the types will not have changed as
2053 their scopes will not have been re-entered. */
2054 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2056 b->type = TREE_TYPE (b->decl);
2059 if (B_IN_FILE_SCOPE (b)
2060 && TREE_CODE (b->decl) == VAR_DECL
2061 && TREE_STATIC (b->decl)
2062 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2063 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2064 && TREE_CODE (type) == ARRAY_TYPE
2065 && TYPE_DOMAIN (type)
2066 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2067 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2069 /* Array type completed in inner scope, which should be
2070 diagnosed if the completion does not have size 1 and
2071 it does not get completed in the file scope. */
2072 b->inner_comp = true;
2077 /* If a matching external declaration has been found, set its
2078 type to the composite of all the types of that declaration.
2079 After the consistency checks, it will be reset to the
2080 composite of the visible types only. */
2081 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2083 TREE_TYPE (b->decl) = b->type;
2085 /* The point of the same_translation_unit_p check here is,
2086 we want to detect a duplicate decl for a construct like
2087 foo() { extern bar(); } ... static bar(); but not if
2088 they are in different translation units. In any case,
2089 the static does not go in the externals scope. */
2091 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2092 && duplicate_decls (x, b->decl))
2095 thistype = (vistype ? composite_type (vistype, type) : type);
2096 b->type = TREE_TYPE (b->decl);
2097 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2099 = build_type_attribute_variant (thistype,
2100 TYPE_ATTRIBUTES (b->type));
2101 TREE_TYPE (b->decl) = thistype;
2102 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2105 else if (TREE_PUBLIC (x))
2107 if (visdecl && !b && duplicate_decls (x, visdecl))
2109 /* An external declaration at block scope referring to a
2110 visible entity with internal linkage. The composite
2111 type will already be correct for this scope, so we
2112 just need to fall through to make the declaration in
2119 bind (name, x, external_scope, /*invisible=*/true,
2126 warn_if_shadowing (x);
2128 skip_external_and_shadow_checks:
2129 if (TREE_CODE (x) == TYPE_DECL)
2130 clone_underlying_type (x);
2132 bind (name, x, scope, /*invisible=*/false, nested);
2134 /* If x's type is incomplete because it's based on a
2135 structure or union which has not yet been fully declared,
2136 attach it to that structure or union type, so we can go
2137 back and complete the variable declaration later, if the
2138 structure or union gets fully declared.
2140 If the input is erroneous, we can have error_mark in the type
2141 slot (e.g. "f(void a, ...)") - that doesn't count as an
2143 if (TREE_TYPE (x) != error_mark_node
2144 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2146 tree element = TREE_TYPE (x);
2148 while (TREE_CODE (element) == ARRAY_TYPE)
2149 element = TREE_TYPE (element);
2150 element = TYPE_MAIN_VARIANT (element);
2152 if ((TREE_CODE (element) == RECORD_TYPE
2153 || TREE_CODE (element) == UNION_TYPE)
2154 && (TREE_CODE (x) != TYPE_DECL
2155 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2156 && !COMPLETE_TYPE_P (element))
2157 C_TYPE_INCOMPLETE_VARS (element)
2158 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2163 /* Record X as belonging to file scope.
2164 This is used only internally by the Objective-C front end,
2165 and is limited to its needs. duplicate_decls is not called;
2166 if there is any preexisting decl for this identifier, it is an ICE. */
2169 pushdecl_top_level (tree x)
2172 bool nested = false;
2173 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2175 name = DECL_NAME (x);
2177 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2179 if (TREE_PUBLIC (x))
2181 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2185 bind (name, x, file_scope, /*invisible=*/false, nested);
2191 implicit_decl_warning (tree id, tree olddecl)
2193 void (*diag) (const char *, ...);
2194 switch (mesg_implicit_function_declaration)
2197 case 1: diag = warning; break;
2198 case 2: diag = error; break;
2199 default: gcc_unreachable ();
2202 diag (N_("implicit declaration of function %qE"), id);
2204 locate_old_decl (olddecl, diag);
2207 /* Generate an implicit declaration for identifier FUNCTIONID as a
2208 function of type int (). */
2211 implicitly_declare (tree functionid)
2213 struct c_binding *b;
2217 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2219 if (B_IN_SCOPE (b, external_scope))
2228 if (decl == error_mark_node)
2231 /* FIXME: Objective-C has weird not-really-builtin functions
2232 which are supposed to be visible automatically. They wind up
2233 in the external scope because they're pushed before the file
2234 scope gets created. Catch this here and rebind them into the
2236 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2238 bind (functionid, decl, file_scope,
2239 /*invisible=*/false, /*nested=*/true);
2244 tree newtype = default_function_type;
2246 TREE_TYPE (decl) = b->type;
2247 /* Implicit declaration of a function already declared
2248 (somehow) in a different scope, or as a built-in.
2249 If this is the first time this has happened, warn;
2250 then recycle the old declaration but with the new type. */
2251 if (!C_DECL_IMPLICIT (decl))
2253 implicit_decl_warning (functionid, decl);
2254 C_DECL_IMPLICIT (decl) = 1;
2256 if (DECL_BUILT_IN (decl))
2258 newtype = build_type_attribute_variant (newtype,
2260 (TREE_TYPE (decl)));
2261 if (!comptypes (newtype, TREE_TYPE (decl)))
2263 warning ("incompatible implicit declaration of built-in"
2264 " function %qD", decl);
2265 newtype = TREE_TYPE (decl);
2270 if (!comptypes (newtype, TREE_TYPE (decl)))
2272 error ("incompatible implicit declaration of function %qD",
2274 locate_old_decl (decl, error);
2277 b->type = TREE_TYPE (decl);
2278 TREE_TYPE (decl) = newtype;
2279 bind (functionid, decl, current_scope,
2280 /*invisible=*/false, /*nested=*/true);
2285 /* Not seen before. */
2286 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2287 DECL_EXTERNAL (decl) = 1;
2288 TREE_PUBLIC (decl) = 1;
2289 C_DECL_IMPLICIT (decl) = 1;
2290 implicit_decl_warning (functionid, 0);
2291 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2293 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2295 /* C89 says implicit declarations are in the innermost block.
2296 So we record the decl in the standard fashion. */
2297 decl = pushdecl (decl);
2299 /* No need to call objc_check_decl here - it's a function type. */
2300 rest_of_decl_compilation (decl, 0, 0);
2302 /* Write a record describing this implicit function declaration
2303 to the prototypes file (if requested). */
2304 gen_aux_info_record (decl, 0, 1, 0);
2306 /* Possibly apply some default attributes to this implicit declaration. */
2307 decl_attributes (&decl, NULL_TREE, 0);
2312 /* Issue an error message for a reference to an undeclared variable
2313 ID, including a reference to a builtin outside of function-call
2314 context. Establish a binding of the identifier to error_mark_node
2315 in an appropriate scope, which will suppress further errors for the
2316 same identifier. The error message should be given location LOC. */
2318 undeclared_variable (tree id, location_t loc)
2320 static bool already = false;
2321 struct c_scope *scope;
2323 if (current_function_decl == 0)
2325 error ("%H%qE undeclared here (not in a function)", &loc, id);
2326 scope = current_scope;
2330 error ("%H%qE undeclared (first use in this function)", &loc, id);
2334 error ("%H(Each undeclared identifier is reported only once", &loc);
2335 error ("%Hfor each function it appears in.)", &loc);
2339 /* If we are parsing old-style parameter decls, current_function_decl
2340 will be nonnull but current_function_scope will be null. */
2341 scope = current_function_scope ? current_function_scope : current_scope;
2343 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2346 /* Subroutine of lookup_label, declare_label, define_label: construct a
2347 LABEL_DECL with all the proper frills. */
2350 make_label (tree name, location_t location)
2352 tree label = build_decl (LABEL_DECL, name, void_type_node);
2354 DECL_CONTEXT (label) = current_function_decl;
2355 DECL_MODE (label) = VOIDmode;
2356 DECL_SOURCE_LOCATION (label) = location;
2361 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2362 Create one if none exists so far for the current function.
2363 This is called when a label is used in a goto expression or
2364 has its address taken. */
2367 lookup_label (tree name)
2371 if (current_function_decl == 0)
2373 error ("label %qE referenced outside of any function", name);
2377 /* Use a label already defined or ref'd with this name, but not if
2378 it is inherited from a containing function and wasn't declared
2380 label = I_LABEL_DECL (name);
2381 if (label && (DECL_CONTEXT (label) == current_function_decl
2382 || C_DECLARED_LABEL_FLAG (label)))
2384 /* If the label has only been declared, update its apparent
2385 location to point here, for better diagnostics if it
2386 turns out not to have been defined. */
2387 if (!TREE_USED (label))
2388 DECL_SOURCE_LOCATION (label) = input_location;
2392 /* No label binding for that identifier; make one. */
2393 label = make_label (name, input_location);
2395 /* Ordinary labels go in the current function scope. */
2396 bind (name, label, current_function_scope,
2397 /*invisible=*/false, /*nested=*/false);
2401 /* Make a label named NAME in the current function, shadowing silently
2402 any that may be inherited from containing functions or containing
2403 scopes. This is called for __label__ declarations. */
2406 declare_label (tree name)
2408 struct c_binding *b = I_LABEL_BINDING (name);
2411 /* Check to make sure that the label hasn't already been declared
2413 if (b && B_IN_CURRENT_SCOPE (b))
2415 error ("duplicate label declaration %qE", name);
2416 locate_old_decl (b->decl, error);
2418 /* Just use the previous declaration. */
2422 label = make_label (name, input_location);
2423 C_DECLARED_LABEL_FLAG (label) = 1;
2425 /* Declared labels go in the current scope. */
2426 bind (name, label, current_scope,
2427 /*invisible=*/false, /*nested=*/false);
2431 /* Define a label, specifying the location in the source file.
2432 Return the LABEL_DECL node for the label, if the definition is valid.
2433 Otherwise return 0. */
2436 define_label (location_t location, tree name)
2438 /* Find any preexisting label with this name. It is an error
2439 if that label has already been defined in this function, or
2440 if there is a containing function with a declared label with
2442 tree label = I_LABEL_DECL (name);
2443 struct c_label_list *nlist;
2446 && ((DECL_CONTEXT (label) == current_function_decl
2447 && DECL_INITIAL (label) != 0)
2448 || (DECL_CONTEXT (label) != current_function_decl
2449 && C_DECLARED_LABEL_FLAG (label))))
2451 error ("%Hduplicate label %qD", &location, label);
2452 locate_old_decl (label, error);
2455 else if (label && DECL_CONTEXT (label) == current_function_decl)
2457 /* The label has been used or declared already in this function,
2458 but not defined. Update its location to point to this
2460 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2461 error ("%Jjump into statement expression", label);
2462 DECL_SOURCE_LOCATION (label) = location;
2466 /* No label binding for that identifier; make one. */
2467 label = make_label (name, location);
2469 /* Ordinary labels go in the current function scope. */
2470 bind (name, label, current_function_scope,
2471 /*invisible=*/false, /*nested=*/false);
2474 if (warn_traditional && !in_system_header && lookup_name (name))
2475 warning ("%Htraditional C lacks a separate namespace for labels, "
2476 "identifier %qE conflicts", &location, name);
2478 nlist = XOBNEW (&parser_obstack, struct c_label_list);
2479 nlist->next = label_context_stack->labels_def;
2480 nlist->label = label;
2481 label_context_stack->labels_def = nlist;
2483 /* Mark label as having been defined. */
2484 DECL_INITIAL (label) = error_mark_node;
2488 /* Given NAME, an IDENTIFIER_NODE,
2489 return the structure (or union or enum) definition for that name.
2490 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2491 CODE says which kind of type the caller wants;
2492 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2493 If the wrong kind of type is found, an error is reported. */
2496 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2498 struct c_binding *b = I_TAG_BINDING (name);
2504 /* We only care about whether it's in this level if
2505 thislevel_only was set or it might be a type clash. */
2506 if (thislevel_only || TREE_CODE (b->decl) != code)
2508 /* For our purposes, a tag in the external scope is the same as
2509 a tag in the file scope. (Primarily relevant to Objective-C
2510 and its builtin structure tags, which get pushed before the
2511 file scope is created.) */
2512 if (B_IN_CURRENT_SCOPE (b)
2513 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2517 if (thislevel_only && !thislevel)
2520 if (TREE_CODE (b->decl) != code)
2522 /* Definition isn't the kind we were looking for. */
2523 pending_invalid_xref = name;
2524 pending_invalid_xref_location = input_location;
2526 /* If in the same binding level as a declaration as a tag
2527 of a different type, this must not be allowed to
2528 shadow that tag, so give the error immediately.
2529 (For example, "struct foo; union foo;" is invalid.) */
2531 pending_xref_error ();
2536 /* Print an error message now
2537 for a recent invalid struct, union or enum cross reference.
2538 We don't print them immediately because they are not invalid
2539 when used in the `struct foo;' construct for shadowing. */
2542 pending_xref_error (void)
2544 if (pending_invalid_xref != 0)
2545 error ("%H%qE defined as wrong kind of tag",
2546 &pending_invalid_xref_location, pending_invalid_xref);
2547 pending_invalid_xref = 0;
2551 /* Look up NAME in the current scope and its superiors
2552 in the namespace of variables, functions and typedefs.
2553 Return a ..._DECL node of some kind representing its definition,
2554 or return 0 if it is undefined. */
2557 lookup_name (tree name)
2559 struct c_binding *b = I_SYMBOL_BINDING (name);
2560 if (b && !b->invisible)
2565 /* Similar to `lookup_name' but look only at the indicated scope. */
2568 lookup_name_in_scope (tree name, struct c_scope *scope)
2570 struct c_binding *b;
2572 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2573 if (B_IN_SCOPE (b, scope))
2578 /* Create the predefined scalar types of C,
2579 and some nodes representing standard constants (0, 1, (void *) 0).
2580 Initialize the global scope.
2581 Make definitions for built-in primitive functions. */
2584 c_init_decl_processing (void)
2586 location_t save_loc = input_location;
2588 /* Initialize reserved words for parser. */
2591 current_function_decl = 0;
2593 gcc_obstack_init (&parser_obstack);
2595 /* Make the externals scope. */
2597 external_scope = current_scope;
2599 /* Declarations from c_common_nodes_and_builtins must not be associated
2600 with this input file, lest we get differences between using and not
2601 using preprocessed headers. */
2602 #ifdef USE_MAPPED_LOCATION
2603 input_location = BUILTINS_LOCATION;
2605 input_location.file = "<built-in>";
2606 input_location.line = 0;
2609 build_common_tree_nodes (flag_signed_char, false);
2611 c_common_nodes_and_builtins ();
2613 /* In C, comparisons and TRUTH_* expressions have type int. */
2614 truthvalue_type_node = integer_type_node;
2615 truthvalue_true_node = integer_one_node;
2616 truthvalue_false_node = integer_zero_node;
2618 /* Even in C99, which has a real boolean type. */
2619 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2620 boolean_type_node));
2622 input_location = save_loc;
2624 pedantic_lvalues = true;
2626 make_fname_decl = c_make_fname_decl;
2627 start_fname_decls ();
2630 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2631 decl, NAME is the initialization string and TYPE_DEP indicates whether
2632 NAME depended on the type of the function. As we don't yet implement
2633 delayed emission of static data, we mark the decl as emitted
2634 so it is not placed in the output. Anything using it must therefore pull
2635 out the STRING_CST initializer directly. FIXME. */
2638 c_make_fname_decl (tree id, int type_dep)
2640 const char *name = fname_as_string (type_dep);
2641 tree decl, type, init;
2642 size_t length = strlen (name);
2644 type = build_array_type (char_type_node,
2645 build_index_type (size_int (length)));
2646 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2648 decl = build_decl (VAR_DECL, id, type);
2650 TREE_STATIC (decl) = 1;
2651 TREE_READONLY (decl) = 1;
2652 DECL_ARTIFICIAL (decl) = 1;
2654 init = build_string (length + 1, name);
2655 free ((char *) name);
2656 TREE_TYPE (init) = type;
2657 DECL_INITIAL (decl) = init;
2659 TREE_USED (decl) = 1;
2661 if (current_function_decl)
2663 DECL_CONTEXT (decl) = current_function_decl;
2664 bind (id, decl, current_function_scope,
2665 /*invisible=*/false, /*nested=*/false);
2668 finish_decl (decl, init, NULL_TREE);
2673 /* Return a definition for a builtin function named NAME and whose data type
2674 is TYPE. TYPE should be a function type with argument types.
2675 FUNCTION_CODE tells later passes how to compile calls to this function.
2676 See tree.h for its possible values.
2678 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2679 the name to be called if we can't opencode the function. If
2680 ATTRS is nonzero, use that for the function's attribute list. */
2683 builtin_function (const char *name, tree type, int function_code,
2684 enum built_in_class cl, const char *library_name,
2687 tree id = get_identifier (name);
2688 tree decl = build_decl (FUNCTION_DECL, id, type);
2689 TREE_PUBLIC (decl) = 1;
2690 DECL_EXTERNAL (decl) = 1;
2691 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2692 DECL_BUILT_IN_CLASS (decl) = cl;
2693 DECL_FUNCTION_CODE (decl) = function_code;
2695 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2697 /* Should never be called on a symbol with a preexisting meaning. */
2698 gcc_assert (!I_SYMBOL_BINDING (id));
2700 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2702 /* Builtins in the implementation namespace are made visible without
2703 needing to be explicitly declared. See push_file_scope. */
2704 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2706 TREE_CHAIN (decl) = visible_builtins;
2707 visible_builtins = decl;
2710 /* Possibly apply some default attributes to this built-in function. */
2712 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2714 decl_attributes (&decl, NULL_TREE, 0);
2719 /* Called when a declaration is seen that contains no names to declare.
2720 If its type is a reference to a structure, union or enum inherited
2721 from a containing scope, shadow that tag name for the current scope
2722 with a forward reference.
2723 If its type defines a new named structure or union
2724 or defines an enum, it is valid but we need not do anything here.
2725 Otherwise, it is an error. */
2728 shadow_tag (const struct c_declspecs *declspecs)
2730 shadow_tag_warned (declspecs, 0);
2733 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2736 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2738 bool found_tag = false;
2740 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2742 tree value = declspecs->type;
2743 enum tree_code code = TREE_CODE (value);
2745 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2746 /* Used to test also that TYPE_SIZE (value) != 0.
2747 That caused warning for `struct foo;' at top level in the file. */
2749 tree name = TYPE_NAME (value);
2756 if (warned != 1 && code != ENUMERAL_TYPE)
2757 /* Empty unnamed enum OK */
2759 pedwarn ("unnamed struct/union that defines no instances");
2763 else if (!declspecs->tag_defined_p
2764 && declspecs->storage_class != csc_none)
2767 pedwarn ("empty declaration with storage class specifier "
2768 "does not redeclare tag");
2770 pending_xref_error ();
2772 else if (!declspecs->tag_defined_p
2773 && (declspecs->const_p
2774 || declspecs->volatile_p
2775 || declspecs->restrict_p))
2778 pedwarn ("empty declaration with type qualifier "
2779 "does not redeclare tag");
2781 pending_xref_error ();
2785 pending_invalid_xref = 0;
2786 t = lookup_tag (code, name, 1);
2790 t = make_node (code);
2797 if (warned != 1 && !in_system_header)
2799 pedwarn ("useless type name in empty declaration");
2804 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2806 pedwarn ("useless type name in empty declaration");
2810 pending_invalid_xref = 0;
2812 if (declspecs->inline_p)
2814 error ("%<inline%> in empty declaration");
2818 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2820 error ("%<auto%> in file-scope empty declaration");
2824 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2826 error ("%<register%> in file-scope empty declaration");
2830 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2832 warning ("useless storage class specifier in empty declaration");
2836 if (!warned && !in_system_header && declspecs->thread_p)
2838 warning ("useless %<__thread%> in empty declaration");
2842 if (!warned && !in_system_header && (declspecs->const_p
2843 || declspecs->volatile_p
2844 || declspecs->restrict_p))
2846 warning ("useless type qualifier in empty declaration");
2853 pedwarn ("empty declaration");
2858 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2859 bits. SPECS represents declaration specifiers that the grammar
2860 only permits to contain type qualifiers and attributes. */
2863 quals_from_declspecs (const struct c_declspecs *specs)
2865 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
2866 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
2867 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
2868 gcc_assert (!specs->type
2869 && !specs->decl_attr
2870 && specs->typespec_word == cts_none
2871 && specs->storage_class == csc_none
2872 && !specs->typedef_p
2873 && !specs->explicit_signed_p
2874 && !specs->deprecated_p
2876 && !specs->long_long_p
2879 && !specs->unsigned_p
2880 && !specs->complex_p
2882 && !specs->thread_p);
2886 /* Construct an array declarator. EXPR is the expression inside [], or
2887 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2888 to the pointer to which a parameter array is converted). STATIC_P is
2889 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2890 is true if the array is [*], a VLA of unspecified length which is
2891 nevertheless a complete type (not currently implemented by GCC),
2892 false otherwise. The field for the contained declarator is left to be
2893 filled in by set_array_declarator_inner. */
2895 struct c_declarator *
2896 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
2899 struct c_declarator *declarator = XOBNEW (&parser_obstack,
2900 struct c_declarator);
2901 declarator->kind = cdk_array;
2902 declarator->declarator = 0;
2903 declarator->u.array.dimen = expr;
2906 declarator->u.array.attrs = quals->attrs;
2907 declarator->u.array.quals = quals_from_declspecs (quals);
2911 declarator->u.array.attrs = NULL_TREE;
2912 declarator->u.array.quals = 0;
2914 declarator->u.array.static_p = static_p;
2915 declarator->u.array.vla_unspec_p = vla_unspec_p;
2916 if (pedantic && !flag_isoc99)
2918 if (static_p || quals != NULL)
2919 pedwarn ("ISO C90 does not support %<static%> or type "
2920 "qualifiers in parameter array declarators");
2922 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
2925 warning ("GCC does not yet properly implement %<[*]%> array declarators");
2929 /* Set the contained declarator of an array declarator. DECL is the
2930 declarator, as constructed by build_array_declarator; INNER is what
2931 appears on the left of the []. ABSTRACT_P is true if it is an
2932 abstract declarator, false otherwise; this is used to reject static
2933 and type qualifiers in abstract declarators, where they are not in
2934 the C99 grammar (subject to possible change in DR#289). */
2936 struct c_declarator *
2937 set_array_declarator_inner (struct c_declarator *decl,
2938 struct c_declarator *inner, bool abstract_p)
2940 decl->declarator = inner;
2941 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
2942 || decl->u.array.attrs != NULL_TREE
2943 || decl->u.array.static_p))
2944 error ("static or type qualifiers in abstract declarator");
2948 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2951 groktypename (struct c_type_name *type_name)
2954 tree attrs = type_name->specs->attrs;
2956 type_name->specs->attrs = NULL_TREE;
2958 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
2961 /* Apply attributes. */
2962 decl_attributes (&type, attrs, 0);
2967 /* Decode a declarator in an ordinary declaration or data definition.
2968 This is called as soon as the type information and variable name
2969 have been parsed, before parsing the initializer if any.
2970 Here we create the ..._DECL node, fill in its type,
2971 and put it on the list of decls for the current context.
2972 The ..._DECL node is returned as the value.
2974 Exception: for arrays where the length is not specified,
2975 the type is left null, to be filled in by `finish_decl'.
2977 Function definitions do not come here; they go to start_function
2978 instead. However, external and forward declarations of functions
2979 do go through here. Structure field declarations are done by
2980 grokfield and not through here. */
2983 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
2984 bool initialized, tree attributes)
2989 /* An object declared as __attribute__((deprecated)) suppresses
2990 warnings of uses of other deprecated items. */
2991 if (lookup_attribute ("deprecated", attributes))
2992 deprecated_state = DEPRECATED_SUPPRESS;
2994 decl = grokdeclarator (declarator, declspecs,
2995 NORMAL, initialized, NULL);
2999 deprecated_state = DEPRECATED_NORMAL;
3001 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3002 && MAIN_NAME_P (DECL_NAME (decl)))
3003 warning ("%J%qD is usually a function", decl, decl);
3006 /* Is it valid for this decl to have an initializer at all?
3007 If not, set INITIALIZED to zero, which will indirectly
3008 tell 'finish_decl' to ignore the initializer once it is parsed. */
3009 switch (TREE_CODE (decl))
3012 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3017 error ("function %qD is initialized like a variable", decl);
3022 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3023 error ("parameter %qD is initialized", decl);
3028 /* Don't allow initializations for incomplete types except for
3029 arrays which might be completed by the initialization. */
3031 /* This can happen if the array size is an undefined macro.
3032 We already gave a warning, so we don't need another one. */
3033 if (TREE_TYPE (decl) == error_mark_node)
3035 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3037 /* A complete type is ok if size is fixed. */
3039 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3040 || C_DECL_VARIABLE_SIZE (decl))
3042 error ("variable-sized object may not be initialized");
3046 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3048 error ("variable %qD has initializer but incomplete type", decl);
3051 else if (C_DECL_VARIABLE_SIZE (decl))
3053 /* Although C99 is unclear about whether incomplete arrays
3054 of VLAs themselves count as VLAs, it does not make
3055 sense to permit them to be initialized given that
3056 ordinary VLAs may not be initialized. */
3057 error ("variable-sized object may not be initialized");
3064 if (current_scope == file_scope)
3065 TREE_STATIC (decl) = 1;
3067 /* Tell 'pushdecl' this is an initialized decl
3068 even though we don't yet have the initializer expression.
3069 Also tell 'finish_decl' it may store the real initializer. */
3070 DECL_INITIAL (decl) = error_mark_node;
3073 /* If this is a function declaration, write a record describing it to the
3074 prototypes file (if requested). */
3076 if (TREE_CODE (decl) == FUNCTION_DECL)
3077 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3079 /* ANSI specifies that a tentative definition which is not merged with
3080 a non-tentative definition behaves exactly like a definition with an
3081 initializer equal to zero. (Section 3.7.2)
3083 -fno-common gives strict ANSI behavior, though this tends to break
3084 a large body of code that grew up without this rule.
3086 Thread-local variables are never common, since there's no entrenched
3087 body of code to break, and it allows more efficient variable references
3088 in the presence of dynamic linking. */
3090 if (TREE_CODE (decl) == VAR_DECL
3092 && TREE_PUBLIC (decl)
3093 && !DECL_THREAD_LOCAL (decl)
3095 DECL_COMMON (decl) = 1;
3097 /* Set attributes here so if duplicate decl, will have proper attributes. */
3098 decl_attributes (&decl, attributes, 0);
3100 if (TREE_CODE (decl) == FUNCTION_DECL
3101 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3103 struct c_declarator *ce = declarator;
3105 if (ce->kind == cdk_pointer)
3106 ce = declarator->declarator;
3107 if (ce->kind == cdk_function)
3109 tree args = ce->u.arg_info->parms;
3110 for (; args; args = TREE_CHAIN (args))
3112 tree type = TREE_TYPE (args);
3113 if (type && INTEGRAL_TYPE_P (type)
3114 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3115 DECL_ARG_TYPE (args) = integer_type_node;
3120 if (TREE_CODE (decl) == FUNCTION_DECL
3121 && DECL_DECLARED_INLINE_P (decl)
3122 && DECL_UNINLINABLE (decl)
3123 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3124 warning ("%Jinline function %qD given attribute noinline", decl, decl);
3126 /* Add this decl to the current scope.
3127 TEM may equal DECL or it may be a previous decl of the same name. */
3128 tem = pushdecl (decl);
3130 if (initialized && DECL_EXTERNAL (tem))
3132 DECL_EXTERNAL (tem) = 0;
3133 TREE_STATIC (tem) = 1;
3139 /* Finish processing of a declaration;
3140 install its initial value.
3141 If the length of an array type is not known before,
3142 it must be determined now, from the initial value, or it is an error. */
3145 finish_decl (tree decl, tree init, tree asmspec_tree)
3147 tree type = TREE_TYPE (decl);
3148 int was_incomplete = (DECL_SIZE (decl) == 0);
3149 const char *asmspec = 0;
3151 /* If a name was specified, get the string. */
3152 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3153 && DECL_FILE_SCOPE_P (decl))
3154 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3156 asmspec = TREE_STRING_POINTER (asmspec_tree);
3158 /* If `start_decl' didn't like having an initialization, ignore it now. */
3159 if (init != 0 && DECL_INITIAL (decl) == 0)
3162 /* Don't crash if parm is initialized. */
3163 if (TREE_CODE (decl) == PARM_DECL)
3167 store_init_value (decl, init);
3169 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3170 || TREE_CODE (decl) == FUNCTION_DECL
3171 || TREE_CODE (decl) == FIELD_DECL))
3172 objc_check_decl (decl);
3174 /* Deduce size of array from initialization, if not already known. */
3175 if (TREE_CODE (type) == ARRAY_TYPE
3176 && TYPE_DOMAIN (type) == 0
3177 && TREE_CODE (decl) != TYPE_DECL)
3180 = (TREE_STATIC (decl)
3181 /* Even if pedantic, an external linkage array
3182 may have incomplete type at first. */
3183 ? pedantic && !TREE_PUBLIC (decl)
3184 : !DECL_EXTERNAL (decl));
3186 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3189 /* Get the completed type made by complete_array_type. */
3190 type = TREE_TYPE (decl);
3193 error ("%Jinitializer fails to determine size of %qD", decl, decl);
3195 else if (failure == 2)
3198 error ("%Jarray size missing in %qD", decl, decl);
3199 /* If a `static' var's size isn't known,
3200 make it extern as well as static, so it does not get
3202 If it is not `static', then do not mark extern;
3203 finish_incomplete_decl will give it a default size
3204 and it will get allocated. */
3205 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3206 DECL_EXTERNAL (decl) = 1;
3208 else if (failure == 3)
3209 error ("%Jzero or negative size array %qD", decl, decl);
3211 if (DECL_INITIAL (decl))
3212 TREE_TYPE (DECL_INITIAL (decl)) = type;
3214 layout_decl (decl, 0);
3217 if (TREE_CODE (decl) == VAR_DECL)
3219 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3220 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3221 layout_decl (decl, 0);
3223 if (DECL_SIZE (decl) == 0
3224 /* Don't give an error if we already gave one earlier. */
3225 && TREE_TYPE (decl) != error_mark_node
3226 && (TREE_STATIC (decl)
3227 /* A static variable with an incomplete type
3228 is an error if it is initialized.
3229 Also if it is not file scope.
3230 Otherwise, let it through, but if it is not `extern'
3231 then it may cause an error message later. */
3232 ? (DECL_INITIAL (decl) != 0
3233 || !DECL_FILE_SCOPE_P (decl))
3234 /* An automatic variable with an incomplete type
3236 : !DECL_EXTERNAL (decl)))
3238 error ("%Jstorage size of %qD isn%'t known", decl, decl);
3239 TREE_TYPE (decl) = error_mark_node;
3242 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3243 && DECL_SIZE (decl) != 0)
3245 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3246 constant_expression_warning (DECL_SIZE (decl));
3248 error ("%Jstorage size of %qD isn%'t constant", decl, decl);
3251 if (TREE_USED (type))
3252 TREE_USED (decl) = 1;
3255 /* If this is a function and an assembler name is specified, reset DECL_RTL
3256 so we can give it its new name. Also, update built_in_decls if it
3257 was a normal built-in. */
3258 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3260 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3261 set_builtin_user_assembler_name (decl, asmspec);
3262 set_user_assembler_name (decl, asmspec);
3265 /* If #pragma weak was used, mark the decl weak now. */
3266 if (current_scope == file_scope)
3267 maybe_apply_pragma_weak (decl);
3269 /* If this is a variable definition, determine its ELF visibility. */
3270 if (TREE_CODE (decl) == VAR_DECL
3271 && TREE_STATIC (decl)
3272 && !DECL_EXTERNAL (decl))
3273 c_determine_visibility (decl);
3275 /* Output the assembler code and/or RTL code for variables and functions,
3276 unless the type is an undefined structure or union.
3277 If not, it will get done when the type is completed. */
3279 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3281 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3282 if (c_dialect_objc ())
3283 objc_check_decl (decl);
3287 /* If this is not a static variable, issue a warning.
3288 It doesn't make any sense to give an ASMSPEC for an
3289 ordinary, non-register local variable. Historically,
3290 GCC has accepted -- but ignored -- the ASMSPEC in
3292 if (!DECL_FILE_SCOPE_P (decl)
3293 && TREE_CODE (decl) == VAR_DECL
3294 && !C_DECL_REGISTER (decl)
3295 && !TREE_STATIC (decl))
3296 warning ("%Jignoring asm-specifier for non-static local "
3297 "variable %qD", decl, decl);
3298 else if (C_DECL_REGISTER (decl))
3299 change_decl_assembler_name (decl, get_identifier (asmspec));
3301 set_user_assembler_name (decl, asmspec);
3304 if (DECL_FILE_SCOPE_P (decl))
3306 if (DECL_INITIAL (decl) == NULL_TREE
3307 || DECL_INITIAL (decl) == error_mark_node)
3308 /* Don't output anything
3309 when a tentative file-scope definition is seen.
3310 But at end of compilation, do output code for them. */
3311 DECL_DEFER_OUTPUT (decl) = 1;
3312 rest_of_decl_compilation (decl, true, 0);
3316 /* In conjunction with an ASMSPEC, the `register'
3317 keyword indicates that we should place the variable
3318 in a particular register. */
3319 if (asmspec && C_DECL_REGISTER (decl))
3321 DECL_HARD_REGISTER (decl) = 1;
3322 /* This cannot be done for a structure with volatile
3323 fields, on which DECL_REGISTER will have been
3325 if (!DECL_REGISTER (decl))
3326 error ("cannot put object with volatile field into register");
3329 if (TREE_CODE (decl) != FUNCTION_DECL)
3331 /* If we're building a variable sized type, and we might be
3332 reachable other than via the top of the current binding
3333 level, then create a new BIND_EXPR so that we deallocate
3334 the object at the right time. */
3335 /* Note that DECL_SIZE can be null due to errors. */
3336 if (DECL_SIZE (decl)
3337 && !TREE_CONSTANT (DECL_SIZE (decl))
3338 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3341 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3342 TREE_SIDE_EFFECTS (bind) = 1;
3344 BIND_EXPR_BODY (bind) = push_stmt_list ();
3346 add_stmt (build_stmt (DECL_EXPR, decl));
3351 if (!DECL_FILE_SCOPE_P (decl))
3353 /* Recompute the RTL of a local array now
3354 if it used to be an incomplete type. */
3356 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3358 /* If we used it already as memory, it must stay in memory. */
3359 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3360 /* If it's still incomplete now, no init will save it. */
3361 if (DECL_SIZE (decl) == 0)
3362 DECL_INITIAL (decl) = 0;
3367 /* If this was marked 'used', be sure it will be output. */
3368 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3369 mark_decl_referenced (decl);
3371 if (TREE_CODE (decl) == TYPE_DECL)
3373 if (!DECL_FILE_SCOPE_P (decl)
3374 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3375 add_stmt (build_stmt (DECL_EXPR, decl));
3377 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3380 /* At the end of a declaration, throw away any variable type sizes
3381 of types defined inside that declaration. There is no use
3382 computing them in the following function definition. */
3383 if (current_scope == file_scope)
3384 get_pending_sizes ();
3386 /* Install a cleanup (aka destructor) if one was given. */
3387 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3389 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3392 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3393 tree cleanup_decl = lookup_name (cleanup_id);
3396 /* Build "cleanup(&decl)" for the destructor. */
3397 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3398 cleanup = build_tree_list (NULL_TREE, cleanup);
3399 cleanup = build_function_call (cleanup_decl, cleanup);
3401 /* Don't warn about decl unused; the cleanup uses it. */
3402 TREE_USED (decl) = 1;
3403 TREE_USED (cleanup_decl) = 1;
3405 /* Initialize EH, if we've been told to do so. */
3406 if (flag_exceptions && !c_eh_initialized_p)
3408 c_eh_initialized_p = true;
3409 eh_personality_libfunc
3410 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3411 ? "__gcc_personality_sj0"
3412 : "__gcc_personality_v0");
3413 using_eh_for_cleanups ();
3416 push_cleanup (decl, cleanup, false);
3421 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3424 grokparm (const struct c_parm *parm)
3426 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3429 decl_attributes (&decl, parm->attrs, 0);
3434 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3435 and push that on the current scope. */
3438 push_parm_decl (const struct c_parm *parm)
3442 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3443 decl_attributes (&decl, parm->attrs, 0);
3445 decl = pushdecl (decl);
3447 finish_decl (decl, NULL_TREE, NULL_TREE);
3450 /* Mark all the parameter declarations to date as forward decls.
3451 Also diagnose use of this extension. */
3454 mark_forward_parm_decls (void)
3456 struct c_binding *b;
3458 if (pedantic && !current_scope->warned_forward_parm_decls)
3460 pedwarn ("ISO C forbids forward parameter declarations");
3461 current_scope->warned_forward_parm_decls = true;
3464 for (b = current_scope->bindings; b; b = b->prev)
3465 if (TREE_CODE (b->decl) == PARM_DECL)
3466 TREE_ASM_WRITTEN (b->decl) = 1;
3469 static GTY(()) int compound_literal_number;
3471 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3472 literal, which may be an incomplete array type completed by the
3473 initializer; INIT is a CONSTRUCTOR that initializes the compound
3477 build_compound_literal (tree type, tree init)
3479 /* We do not use start_decl here because we have a type, not a declarator;
3480 and do not use finish_decl because the decl should be stored inside
3481 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3486 if (type == error_mark_node)
3487 return error_mark_node;
3489 decl = build_decl (VAR_DECL, NULL_TREE, type);
3490 DECL_EXTERNAL (decl) = 0;
3491 TREE_PUBLIC (decl) = 0;
3492 TREE_STATIC (decl) = (current_scope == file_scope);
3493 DECL_CONTEXT (decl) = current_function_decl;
3494 TREE_USED (decl) = 1;
3495 TREE_TYPE (decl) = type;
3496 TREE_READONLY (decl) = TYPE_READONLY (type);
3497 store_init_value (decl, init);
3499 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3501 int failure = complete_array_type (&TREE_TYPE (decl),
3502 DECL_INITIAL (decl), true);
3503 gcc_assert (!failure);
3505 type = TREE_TYPE (decl);
3506 TREE_TYPE (DECL_INITIAL (decl)) = type;
3509 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3510 return error_mark_node;
3512 stmt = build_stmt (DECL_EXPR, decl);
3513 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3514 TREE_SIDE_EFFECTS (complit) = 1;
3516 layout_decl (decl, 0);
3518 if (TREE_STATIC (decl))
3520 /* This decl needs a name for the assembler output. We also need
3521 a unique suffix to be added to the name. */
3524 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3525 compound_literal_number);
3526 compound_literal_number++;
3527 DECL_NAME (decl) = get_identifier (name);
3528 DECL_DEFER_OUTPUT (decl) = 1;
3529 DECL_COMDAT (decl) = 1;
3530 DECL_ARTIFICIAL (decl) = 1;
3531 DECL_IGNORED_P (decl) = 1;
3533 rest_of_decl_compilation (decl, 1, 0);
3539 /* Determine whether TYPE is a structure with a flexible array member,
3540 or a union containing such a structure (possibly recursively). */
3543 flexible_array_type_p (tree type)
3546 switch (TREE_CODE (type))
3549 x = TYPE_FIELDS (type);
3552 while (TREE_CHAIN (x) != NULL_TREE)
3554 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3555 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3556 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3557 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3561 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3563 if (flexible_array_type_p (TREE_TYPE (x)))
3572 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3573 replacing with appropriate values if they are invalid. */
3575 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3578 unsigned int max_width;
3579 unsigned HOST_WIDE_INT w;
3580 const char *name = orig_name ? orig_name: _("<anonymous>");
3582 /* Detect and ignore out of range field width and process valid
3584 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3585 || TREE_CODE (*width) != INTEGER_CST)
3587 error ("bit-field %qs width not an integer constant", name);
3588 *width = integer_one_node;
3592 constant_expression_warning (*width);
3593 if (tree_int_cst_sgn (*width) < 0)
3595 error ("negative width in bit-field %qs", name);
3596 *width = integer_one_node;
3598 else if (integer_zerop (*width) && orig_name)
3600 error ("zero width for bit-field %qs", name);
3601 *width = integer_one_node;
3605 /* Detect invalid bit-field type. */
3606 if (TREE_CODE (*type) != INTEGER_TYPE
3607 && TREE_CODE (*type) != BOOLEAN_TYPE
3608 && TREE_CODE (*type) != ENUMERAL_TYPE)
3610 error ("bit-field %qs has invalid type", name);
3611 *type = unsigned_type_node;
3614 type_mv = TYPE_MAIN_VARIANT (*type);
3616 && type_mv != integer_type_node
3617 && type_mv != unsigned_type_node
3618 && type_mv != boolean_type_node)
3619 pedwarn ("type of bit-field %qs is a GCC extension", name);
3621 if (type_mv == boolean_type_node)
3622 max_width = CHAR_TYPE_SIZE;
3624 max_width = TYPE_PRECISION (*type);
3626 if (0 < compare_tree_int (*width, max_width))
3628 error ("width of %qs exceeds its type", name);
3630 *width = build_int_cst (NULL_TREE, w);
3633 w = tree_low_cst (*width, 1);
3635 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3637 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3639 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3640 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3641 warning ("%qs is narrower than values of its type", name);
3645 /* Given declspecs and a declarator,
3646 determine the name and type of the object declared
3647 and construct a ..._DECL node for it.
3648 (In one case we can return a ..._TYPE node instead.
3649 For invalid input we sometimes return 0.)
3651 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3653 DECL_CONTEXT says which syntactic context this declaration is in:
3654 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3655 FUNCDEF for a function definition. Like NORMAL but a few different
3656 error messages in each case. Return value may be zero meaning
3657 this definition is too screwy to try to parse.
3658 PARM for a parameter declaration (either within a function prototype
3659 or before a function body). Make a PARM_DECL, or return void_type_node.
3660 TYPENAME if for a typename (in a cast or sizeof).
3661 Don't make a DECL node; just return the ..._TYPE node.
3662 FIELD for a struct or union field; make a FIELD_DECL.
3663 INITIALIZED is true if the decl has an initializer.
3664 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3665 representing the width of the bit-field.
3667 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3668 It may also be so in the PARM case, for a prototype where the
3669 argument type is specified but not the name.
3671 This function is where the complicated C meanings of `static'
3672 and `extern' are interpreted. */
3675 grokdeclarator (const struct c_declarator *declarator,
3676 struct c_declspecs *declspecs,
3677 enum decl_context decl_context, bool initialized, tree *width)
3679 tree type = declspecs->type;
3680 bool threadp = declspecs->thread_p;
3681 enum c_storage_class storage_class = declspecs->storage_class;
3685 int type_quals = TYPE_UNQUALIFIED;
3686 const char *name, *orig_name;
3687 tree typedef_type = 0;
3688 int funcdef_flag = 0;
3689 bool funcdef_syntax = false;
3690 int size_varies = 0;
3691 tree decl_attr = declspecs->decl_attr;
3692 int array_ptr_quals = TYPE_UNQUALIFIED;
3693 tree array_ptr_attrs = NULL_TREE;
3694 int array_parm_static = 0;
3695 tree returned_attrs = NULL_TREE;
3696 bool bitfield = width != NULL;
3698 struct c_arg_info *arg_info = 0;
3700 if (decl_context == FUNCDEF)
3701 funcdef_flag = 1, decl_context = NORMAL;
3703 /* Look inside a declarator for the name being declared
3704 and get it as a string, for an error message. */
3706 const struct c_declarator *decl = declarator;
3715 funcdef_syntax = (decl->kind == cdk_function);
3716 decl = decl->declarator;
3720 decl = decl->declarator;
3725 name = IDENTIFIER_POINTER (decl->u.id);
3737 /* A function definition's declarator must have the form of
3738 a function declarator. */
3740 if (funcdef_flag && !funcdef_syntax)
3743 /* If this looks like a function definition, make it one,
3744 even if it occurs where parms are expected.
3745 Then store_parm_decls will reject it and not use it as a parm. */
3746 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3747 decl_context = PARM;
3749 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3750 warn_deprecated_use (declspecs->type);
3752 typedef_type = type;
3753 size_varies = C_TYPE_VARIABLE_SIZE (type);
3755 /* Diagnose defaulting to "int". */
3757 if (declspecs->default_int_p && !in_system_header)
3759 /* Issue a warning if this is an ISO C 99 program or if
3760 -Wreturn-type and this is a function, or if -Wimplicit;
3761 prefer the former warning since it is more explicit. */
3762 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3764 warn_about_return_type = 1;
3765 else if (warn_implicit_int || flag_isoc99)
3766 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
3769 /* Adjust the type if a bit-field is being declared,
3770 -funsigned-bitfields applied and the type is not explicitly
3772 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
3773 && TREE_CODE (type) == INTEGER_TYPE)
3774 type = c_common_unsigned_type (type);
3776 /* Figure out the type qualifiers for the declaration. There are
3777 two ways a declaration can become qualified. One is something
3778 like `const int i' where the `const' is explicit. Another is
3779 something like `typedef const int CI; CI i' where the type of the
3780 declaration contains the `const'. A third possibility is that
3781 there is a type qualifier on the element type of a typedefed
3782 array type, in which case we should extract that qualifier so
3783 that c_apply_type_quals_to_decls receives the full list of
3784 qualifiers to work with (C90 is not entirely clear about whether
3785 duplicate qualifiers should be diagnosed in this case, but it
3786 seems most appropriate to do so). */
3787 element_type = strip_array_types (type);
3788 constp = declspecs->const_p + TYPE_READONLY (element_type);
3789 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
3790 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
3791 if (pedantic && !flag_isoc99)
3794 pedwarn ("duplicate %<const%>");
3796 pedwarn ("duplicate %<restrict%>");
3798 pedwarn ("duplicate %<volatile%>");
3800 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
3801 type = TYPE_MAIN_VARIANT (type);
3802 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3803 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3804 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3806 /* Warn about storage classes that are invalid for certain
3807 kinds of declarations (parameters, typenames, etc.). */
3811 || storage_class == csc_auto
3812 || storage_class == csc_register
3813 || storage_class == csc_typedef))
3815 if (storage_class == csc_auto
3816 && (pedantic || current_scope == file_scope))
3817 pedwarn ("function definition declared %<auto%>");
3818 if (storage_class == csc_register)
3819 error ("function definition declared %<register%>");
3820 if (storage_class == csc_typedef)
3821 error ("function definition declared %<typedef%>");
3823 error ("function definition declared %<__thread%>");
3825 if (storage_class == csc_auto
3826 || storage_class == csc_register
3827 || storage_class == csc_typedef)
3828 storage_class = csc_none;
3830 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
3832 if (decl_context == PARM && storage_class == csc_register)
3836 switch (decl_context)
3839 error ("storage class specified for structure field %qs",
3843 error ("storage class specified for parameter %qs", name);
3846 error ("storage class specified for typename");
3849 storage_class = csc_none;
3853 else if (storage_class == csc_extern
3857 /* 'extern' with initialization is invalid if not at file scope. */
3858 if (current_scope == file_scope)
3859 warning ("%qs initialized and declared %<extern%>", name);
3861 error ("%qs has both %<extern%> and initializer", name);
3863 else if (current_scope == file_scope)
3865 if (storage_class == csc_auto)
3866 error ("file-scope declaration of %qs specifies %<auto%>", name);
3867 if (pedantic && storage_class == csc_register)
3868 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
3872 if (storage_class == csc_extern && funcdef_flag)
3873 error ("nested function %qs declared %<extern%>", name);
3874 else if (threadp && storage_class == csc_none)
3876 error ("function-scope %qs implicitly auto and declared "
3883 /* Now figure out the structure of the declarator proper.
3884 Descend through it, creating more complex types, until we reach
3885 the declared identifier (or NULL_TREE, in an absolute declarator).
3886 At each stage we maintain an unqualified version of the type
3887 together with any qualifiers that should be applied to it with
3888 c_build_qualified_type; this way, array types including
3889 multidimensional array types are first built up in unqualified
3890 form and then the qualified form is created with
3891 TYPE_MAIN_VARIANT pointing to the unqualified form. */
3893 while (declarator && declarator->kind != cdk_id)
3895 if (type == error_mark_node)
3897 declarator = declarator->declarator;
3901 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
3902 a cdk_pointer (for *...),
3903 a cdk_function (for ...(...)),
3904 a cdk_attrs (for nested attributes),
3905 or a cdk_id (for the name being declared
3906 or the place in an absolute declarator
3907 where the name was omitted).
3908 For the last case, we have just exited the loop.
3910 At this point, TYPE is the type of elements of an array,
3911 or for a function to return, or for a pointer to point to.
3912 After this sequence of ifs, TYPE is the type of the
3913 array or function or pointer, and DECLARATOR has had its
3914 outermost layer removed. */
3916 if (array_ptr_quals != TYPE_UNQUALIFIED
3917 || array_ptr_attrs != NULL_TREE
3918 || array_parm_static)
3920 /* Only the innermost declarator (making a parameter be of
3921 array type which is converted to pointer type)
3922 may have static or type qualifiers. */
3923 error ("static or type qualifiers in non-parameter array declarator");
3924 array_ptr_quals = TYPE_UNQUALIFIED;
3925 array_ptr_attrs = NULL_TREE;
3926 array_parm_static = 0;
3929 switch (declarator->kind)
3933 /* A declarator with embedded attributes. */
3934 tree attrs = declarator->u.attrs;
3935 const struct c_declarator *inner_decl;
3937 declarator = declarator->declarator;
3938 inner_decl = declarator;
3939 while (inner_decl->kind == cdk_attrs)
3940 inner_decl = inner_decl->declarator;
3941 if (inner_decl->kind == cdk_id)
3942 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3943 else if (inner_decl->kind == cdk_function)
3944 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3945 else if (inner_decl->kind == cdk_array)
3946 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3947 returned_attrs = decl_attributes (&type,
3948 chainon (returned_attrs, attrs),
3954 tree itype = NULL_TREE;
3955 tree size = declarator->u.array.dimen;
3956 /* The index is a signed object `sizetype' bits wide. */
3957 tree index_type = c_common_signed_type (sizetype);
3959 array_ptr_quals = declarator->u.array.quals;
3960 array_ptr_attrs = declarator->u.array.attrs;
3961 array_parm_static = declarator->u.array.static_p;
3963 declarator = declarator->declarator;
3965 /* Check for some types that there cannot be arrays of. */
3967 if (VOID_TYPE_P (type))
3969 error ("declaration of %qs as array of voids", name);
3970 type = error_mark_node;
3973 if (TREE_CODE (type) == FUNCTION_TYPE)
3975 error ("declaration of %qs as array of functions", name);
3976 type = error_mark_node;
3979 if (pedantic && !in_system_header && flexible_array_type_p (type))
3980 pedwarn ("invalid use of structure with flexible array member");
3982 if (size == error_mark_node)
3983 type = error_mark_node;
3985 if (type == error_mark_node)
3988 /* If size was specified, set ITYPE to a range-type for
3989 that size. Otherwise, ITYPE remains null. finish_decl
3990 may figure it out from an initial value. */
3994 /* Strip NON_LVALUE_EXPRs since we aren't using as an
3996 STRIP_TYPE_NOPS (size);
3998 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4000 error ("size of array %qs has non-integer type", name);
4001 size = integer_one_node;
4004 if (pedantic && integer_zerop (size))
4005 pedwarn ("ISO C forbids zero-size array %qs", name);
4007 if (TREE_CODE (size) == INTEGER_CST)
4009 constant_expression_warning (size);
4010 if (tree_int_cst_sgn (size) < 0)
4012 error ("size of array %qs is negative", name);
4013 size = integer_one_node;
4018 /* Make sure the array size remains visibly
4019 nonconstant even if it is (eg) a const variable
4020 with known value. */
4023 if (!flag_isoc99 && pedantic)
4025 if (TREE_CONSTANT (size))
4026 pedwarn ("ISO C90 forbids array %qs whose size "
4027 "can%'t be evaluated",
4030 pedwarn ("ISO C90 forbids variable-size array %qs",
4035 if (integer_zerop (size))
4037 /* A zero-length array cannot be represented with
4038 an unsigned index type, which is what we'll
4039 get with build_index_type. Create an
4040 open-ended range instead. */
4041 itype = build_range_type (sizetype, size, NULL_TREE);
4045 /* Arrange for the SAVE_EXPR on the inside of the
4046 MINUS_EXPR, which allows the -1 to get folded
4047 with the +1 that happens when building TYPE_SIZE. */
4049 size = variable_size (size);
4051 /* Compute the maximum valid index, that is, size
4052 - 1. Do the calculation in index_type, so that
4053 if it is a variable the computations will be
4054 done in the proper mode. */
4055 itype = fold (build2 (MINUS_EXPR, index_type,
4056 convert (index_type, size),
4057 convert (index_type,
4060 /* If that overflowed, the array is too big. ???
4061 While a size of INT_MAX+1 technically shouldn't
4062 cause an overflow (because we subtract 1), the
4063 overflow is recorded during the conversion to
4064 index_type, before the subtraction. Handling
4065 this case seems like an unnecessary
4067 if (TREE_OVERFLOW (itype))
4069 error ("size of array %qs is too large", name);
4070 type = error_mark_node;
4074 itype = build_index_type (itype);
4077 else if (decl_context == FIELD)
4079 if (pedantic && !flag_isoc99 && !in_system_header)
4080 pedwarn ("ISO C90 does not support flexible array members");
4082 /* ISO C99 Flexible array members are effectively
4083 identical to GCC's zero-length array extension. */
4084 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4087 /* Complain about arrays of incomplete types. */
4088 if (!COMPLETE_TYPE_P (type))
4090 error ("array type has incomplete element type");
4091 type = error_mark_node;
4094 type = build_array_type (type, itype);
4097 C_TYPE_VARIABLE_SIZE (type) = 1;
4099 /* The GCC extension for zero-length arrays differs from
4100 ISO flexible array members in that sizeof yields
4102 if (size && integer_zerop (size))
4104 TYPE_SIZE (type) = bitsize_zero_node;
4105 TYPE_SIZE_UNIT (type) = size_zero_node;
4108 if (decl_context != PARM
4109 && (array_ptr_quals != TYPE_UNQUALIFIED
4110 || array_ptr_attrs != NULL_TREE
4111 || array_parm_static))
4113 error ("static or type qualifiers in non-parameter array declarator");
4114 array_ptr_quals = TYPE_UNQUALIFIED;
4115 array_ptr_attrs = NULL_TREE;
4116 array_parm_static = 0;
4122 /* Say it's a definition only for the declarator closest
4123 to the identifier, apart possibly from some
4125 bool really_funcdef = false;
4129 const struct c_declarator *t = declarator->declarator;
4130 while (t->kind == cdk_attrs)
4132 really_funcdef = (t->kind == cdk_id);
4135 /* Declaring a function type. Make sure we have a valid
4136 type for the function to return. */
4137 if (type == error_mark_node)
4142 /* Warn about some types functions can't return. */
4143 if (TREE_CODE (type) == FUNCTION_TYPE)
4145 error ("%qs declared as function returning a function", name);
4146 type = integer_type_node;
4148 if (TREE_CODE (type) == ARRAY_TYPE)
4150 error ("%qs declared as function returning an array", name);
4151 type = integer_type_node;
4154 /* Construct the function type and go to the next
4155 inner layer of declarator. */
4156 arg_info = declarator->u.arg_info;
4157 arg_types = grokparms (arg_info, really_funcdef);
4159 /* Type qualifiers before the return type of the function
4160 qualify the return type, not the function type. */
4163 /* Type qualifiers on a function return type are
4164 normally permitted by the standard but have no
4165 effect, so give a warning at -Wreturn-type.
4166 Qualifiers on a void return type are banned on
4167 function definitions in ISO C; GCC used to used
4168 them for noreturn functions. */
4169 if (VOID_TYPE_P (type) && really_funcdef)
4170 pedwarn ("function definition has qualified void return type");
4171 else if (warn_return_type)
4172 warning ("type qualifiers ignored on function return type");
4174 type = c_build_qualified_type (type, type_quals);
4176 type_quals = TYPE_UNQUALIFIED;
4178 type = build_function_type (type, arg_types);
4179 declarator = declarator->declarator;
4181 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4182 the formal parameter list of this FUNCTION_TYPE to point to
4183 the FUNCTION_TYPE node itself. */
4187 for (link = arg_info->tags;
4189 link = TREE_CHAIN (link))
4190 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4196 /* Merge any constancy or volatility into the target type
4199 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4201 pedwarn ("ISO C forbids qualified function types");
4203 type = c_build_qualified_type (type, type_quals);
4206 type = build_pointer_type (type);
4208 /* Process type qualifiers (such as const or volatile)
4209 that were given inside the `*'. */
4210 type_quals = declarator->u.pointer_quals;
4212 declarator = declarator->declarator;
4220 /* Now TYPE has the actual type, apart from any qualifiers in
4223 /* Check the type and width of a bit-field. */
4225 check_bitfield_type_and_width (&type, width, orig_name);
4227 /* Did array size calculations overflow? */
4229 if (TREE_CODE (type) == ARRAY_TYPE
4230 && COMPLETE_TYPE_P (type)
4231 && TREE_OVERFLOW (TYPE_SIZE (type)))
4233 error ("size of array %qs is too large", name);
4234 /* If we proceed with the array type as it is, we'll eventually
4235 crash in tree_low_cst(). */
4236 type = error_mark_node;
4239 /* If this is declaring a typedef name, return a TYPE_DECL. */
4241 if (storage_class == csc_typedef)
4244 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4246 pedwarn ("ISO C forbids qualified function types");
4248 type = c_build_qualified_type (type, type_quals);
4249 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4250 if (declspecs->explicit_signed_p)
4251 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4252 decl_attributes (&decl, returned_attrs, 0);
4253 if (declspecs->inline_p)
4254 pedwarn ("%Jtypedef %qD declared %<inline%>", decl, decl);
4258 /* Detect the case of an array type of unspecified size
4259 which came, as such, direct from a typedef name.
4260 We must copy the type, so that each identifier gets
4261 a distinct type, so that each identifier's size can be
4262 controlled separately by its own initializer. */
4264 if (type != 0 && typedef_type != 0
4265 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4266 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4268 type = build_array_type (TREE_TYPE (type), 0);
4270 C_TYPE_VARIABLE_SIZE (type) = 1;
4273 /* If this is a type name (such as, in a cast or sizeof),
4274 compute the type and return it now. */
4276 if (decl_context == TYPENAME)
4278 /* Note that the grammar rejects storage classes in typenames
4280 gcc_assert (storage_class == csc_none && !threadp
4281 && !declspecs->inline_p);
4282 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4284 pedwarn ("ISO C forbids const or volatile function types");
4286 type = c_build_qualified_type (type, type_quals);
4287 decl_attributes (&type, returned_attrs, 0);
4291 /* Aside from typedefs and type names (handle above),
4292 `void' at top level (not within pointer)
4293 is allowed only in public variables.
4294 We don't complain about parms either, but that is because
4295 a better error message can be made later. */
4297 if (VOID_TYPE_P (type) && decl_context != PARM
4298 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4299 && (storage_class == csc_extern
4300 || (current_scope == file_scope
4301 && !(storage_class == csc_static
4302 || storage_class == csc_register)))))
4304 error ("variable or field %qs declared void", name);
4305 type = integer_type_node;
4308 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4309 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4314 if (decl_context == PARM)
4316 tree type_as_written;
4319 /* A parameter declared as an array of T is really a pointer to T.
4320 One declared as a function is really a pointer to a function. */
4322 if (TREE_CODE (type) == ARRAY_TYPE)
4324 /* Transfer const-ness of array into that of type pointed to. */
4325 type = TREE_TYPE (type);
4327 type = c_build_qualified_type (type, type_quals);
4328 type = build_pointer_type (type);
4329 type_quals = array_ptr_quals;
4331 /* We don't yet implement attributes in this context. */
4332 if (array_ptr_attrs != NULL_TREE)
4333 warning ("attributes in parameter array declarator ignored");
4337 else if (TREE_CODE (type) == FUNCTION_TYPE)
4339 if (pedantic && type_quals)
4340 pedwarn ("ISO C forbids qualified function types");
4342 type = c_build_qualified_type (type, type_quals);
4343 type = build_pointer_type (type);
4344 type_quals = TYPE_UNQUALIFIED;
4346 else if (type_quals)
4347 type = c_build_qualified_type (type, type_quals);
4349 type_as_written = type;
4351 decl = build_decl (PARM_DECL, declarator->u.id, type);
4353 C_DECL_VARIABLE_SIZE (decl) = 1;
4355 /* Compute the type actually passed in the parmlist,
4356 for the case where there is no prototype.
4357 (For example, shorts and chars are passed as ints.)
4358 When there is a prototype, this is overridden later. */
4360 if (type == error_mark_node)
4361 promoted_type = type;
4363 promoted_type = c_type_promotes_to (type);
4365 DECL_ARG_TYPE (decl) = promoted_type;
4366 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4367 if (declspecs->inline_p)
4368 pedwarn ("%Jparameter %qD declared %<inline%>", decl, decl);
4370 else if (decl_context == FIELD)
4372 /* Note that the grammar rejects storage classes in typenames
4374 gcc_assert (storage_class == csc_none && !threadp
4375 && !declspecs->inline_p);
4377 /* Structure field. It may not be a function. */
4379 if (TREE_CODE (type) == FUNCTION_TYPE)
4381 error ("field %qs declared as a function", name);
4382 type = build_pointer_type (type);
4384 else if (TREE_CODE (type) != ERROR_MARK
4385 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4387 error ("field %qs has incomplete type", name);
4388 type = error_mark_node;
4390 type = c_build_qualified_type (type, type_quals);
4391 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4392 DECL_NONADDRESSABLE_P (decl) = bitfield;
4395 C_DECL_VARIABLE_SIZE (decl) = 1;
4397 else if (TREE_CODE (type) == FUNCTION_TYPE)
4399 if (storage_class == csc_register || threadp)
4401 error ("invalid storage class for function %qs", name);
4403 else if (current_scope != file_scope)
4405 /* Function declaration not at file scope. Storage
4406 classes other than `extern' are not allowed, C99
4407 6.7.1p5, and `extern' makes no difference. However,
4408 GCC allows 'auto', perhaps with 'inline', to support
4409 nested functions. */
4410 if (storage_class == csc_auto)
4413 pedwarn ("invalid storage class for function %qs", name);
4415 else if (storage_class == csc_static)
4417 error ("invalid storage class for function %qs", name);
4419 storage_class = declspecs->storage_class = csc_none;
4425 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4426 decl = build_decl_attribute_variant (decl, decl_attr);
4428 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4430 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4431 pedwarn ("ISO C forbids qualified function types");
4433 /* GNU C interprets a volatile-qualified function type to indicate
4434 that the function does not return. */
4435 if ((type_quals & TYPE_QUAL_VOLATILE)
4436 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4437 warning ("%<noreturn%> function returns non-void value");
4439 /* Every function declaration is an external reference
4440 (DECL_EXTERNAL) except for those which are not at file
4441 scope and are explicitly declared "auto". This is
4442 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4443 GCC to signify a forward declaration of a nested function. */
4444 if (storage_class == csc_auto && current_scope != file_scope)
4445 DECL_EXTERNAL (decl) = 0;
4447 DECL_EXTERNAL (decl) = 1;
4449 /* Record absence of global scope for `static' or `auto'. */
4451 = !(storage_class == csc_static || storage_class == csc_auto);
4453 /* For a function definition, record the argument information
4454 block where store_parm_decls will look for it. */
4456 current_function_arg_info = arg_info;
4458 if (declspecs->default_int_p)
4459 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4461 /* Record presence of `inline', if it is reasonable. */
4462 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4464 if (declspecs->inline_p)
4465 pedwarn ("cannot inline function %<main%>");
4467 else if (declspecs->inline_p)
4469 /* Record that the function is declared `inline'. */
4470 DECL_DECLARED_INLINE_P (decl) = 1;
4472 /* Do not mark bare declarations as DECL_INLINE. Doing so
4473 in the presence of multiple declarations can result in
4474 the abstract origin pointing between the declarations,
4475 which will confuse dwarf2out. */
4478 DECL_INLINE (decl) = 1;
4479 if (storage_class == csc_extern)
4480 current_extern_inline = 1;
4483 /* If -finline-functions, assume it can be inlined. This does
4484 two things: let the function be deferred until it is actually
4485 needed, and let dwarf2 know that the function is inlinable. */
4486 else if (flag_inline_trees == 2 && initialized)
4487 DECL_INLINE (decl) = 1;
4491 /* It's a variable. */
4492 /* An uninitialized decl with `extern' is a reference. */
4493 int extern_ref = !initialized && storage_class == csc_extern;
4495 type = c_build_qualified_type (type, type_quals);
4497 /* C99 6.2.2p7: It is invalid (compile-time undefined
4498 behavior) to create an 'extern' declaration for a
4499 variable if there is a global declaration that is
4500 'static' and the global declaration is not visible.
4501 (If the static declaration _is_ currently visible,
4502 the 'extern' declaration is taken to refer to that decl.) */
4503 if (extern_ref && current_scope != file_scope)
4505 tree global_decl = identifier_global_value (declarator->u.id);
4506 tree visible_decl = lookup_name (declarator->u.id);
4509 && global_decl != visible_decl
4510 && TREE_CODE (global_decl) == VAR_DECL
4511 && !TREE_PUBLIC (global_decl))
4512 error ("variable previously declared %<static%> redeclared "
4516 decl = build_decl (VAR_DECL, declarator->u.id, type);
4517 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4519 C_DECL_VARIABLE_SIZE (decl) = 1;
4521 if (declspecs->inline_p)
4522 pedwarn ("%Jvariable %qD declared %<inline%>", decl, decl);
4524 /* At file scope, an initialized extern declaration may follow
4525 a static declaration. In that case, DECL_EXTERNAL will be
4526 reset later in start_decl. */
4527 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4529 /* At file scope, the presence of a `static' or `register' storage
4530 class specifier, or the absence of all storage class specifiers
4531 makes this declaration a definition (perhaps tentative). Also,
4532 the absence of both `static' and `register' makes it public. */
4533 if (current_scope == file_scope)
4535 TREE_PUBLIC (decl) = !(storage_class == csc_static
4536 || storage_class == csc_register);
4537 TREE_STATIC (decl) = !extern_ref;
4539 /* Not at file scope, only `static' makes a static definition. */
4542 TREE_STATIC (decl) = (storage_class == csc_static);
4543 TREE_PUBLIC (decl) = extern_ref;
4548 if (targetm.have_tls)
4549 DECL_THREAD_LOCAL (decl) = 1;
4551 /* A mere warning is sure to result in improper semantics
4552 at runtime. Don't bother to allow this to compile. */
4553 error ("thread-local storage not supported for this target");
4557 /* Record `register' declaration for warnings on &
4558 and in case doing stupid register allocation. */
4560 if (storage_class == csc_register)
4562 C_DECL_REGISTER (decl) = 1;
4563 DECL_REGISTER (decl) = 1;
4566 /* Record constancy and volatility. */
4567 c_apply_type_quals_to_decl (type_quals, decl);
4569 /* If a type has volatile components, it should be stored in memory.
4570 Otherwise, the fact that those components are volatile
4571 will be ignored, and would even crash the compiler. */
4572 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4574 /* It is not an error for a structure with volatile fields to
4575 be declared register, but reset DECL_REGISTER since it
4576 cannot actually go in a register. */
4577 int was_reg = C_DECL_REGISTER (decl);
4578 C_DECL_REGISTER (decl) = 0;
4579 DECL_REGISTER (decl) = 0;
4580 c_mark_addressable (decl);
4581 C_DECL_REGISTER (decl) = was_reg;
4584 /* This is the earliest point at which we might know the assembler
4585 name of a variable. Thus, if it's known before this, die horribly. */
4586 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4588 decl_attributes (&decl, returned_attrs, 0);
4594 /* Decode the parameter-list info for a function type or function definition.
4595 The argument is the value returned by `get_parm_info' (or made in parse.y
4596 if there is an identifier list instead of a parameter decl list).
4597 These two functions are separate because when a function returns
4598 or receives functions then each is called multiple times but the order
4599 of calls is different. The last call to `grokparms' is always the one
4600 that contains the formal parameter names of a function definition.
4602 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4604 FUNCDEF_FLAG is true for a function definition, false for
4605 a mere declaration. A nonempty identifier-list gets an error message
4606 when FUNCDEF_FLAG is false. */
4609 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4611 tree arg_types = arg_info->types;
4613 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4614 && !in_system_header)
4615 warning ("function declaration isn%'t a prototype");
4617 if (arg_types == error_mark_node)
4618 return 0; /* don't set TYPE_ARG_TYPES in this case */
4620 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4623 pedwarn ("parameter names (without types) in function declaration");
4625 arg_info->parms = arg_info->types;
4626 arg_info->types = 0;
4631 tree parm, type, typelt;
4632 unsigned int parmno;
4634 /* If there is a parameter of incomplete type in a definition,
4635 this is an error. In a declaration this is valid, and a
4636 struct or union type may be completed later, before any calls
4637 or definition of the function. In the case where the tag was
4638 first declared within the parameter list, a warning has
4639 already been given. If a parameter has void type, then
4640 however the function cannot be defined or called, so
4643 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4645 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4647 type = TREE_VALUE (typelt);
4648 if (type == error_mark_node)
4651 if (!COMPLETE_TYPE_P (type))
4655 if (DECL_NAME (parm))
4656 error ("%Jparameter %u (%qD) has incomplete type",
4657 parm, parmno, parm);
4659 error ("%Jparameter %u has incomplete type",
4662 TREE_VALUE (typelt) = error_mark_node;
4663 TREE_TYPE (parm) = error_mark_node;
4665 else if (VOID_TYPE_P (type))
4667 if (DECL_NAME (parm))
4668 warning ("%Jparameter %u (%qD) has void type",
4669 parm, parmno, parm);
4671 warning ("%Jparameter %u has void type",
4680 /* Take apart the current scope and return a c_arg_info structure with
4681 info on a parameter list just parsed.
4683 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4685 ELLIPSIS being true means the argument list ended in '...' so don't
4686 append a sentinel (void_list_node) to the end of the type-list. */
4689 get_parm_info (bool ellipsis)
4691 struct c_binding *b = current_scope->bindings;
4692 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4699 static bool explained_incomplete_types = false;
4700 bool gave_void_only_once_err = false;
4702 arg_info->parms = 0;
4704 arg_info->types = 0;
4705 arg_info->others = 0;
4707 /* The bindings in this scope must not get put into a block.
4708 We will take care of deleting the binding nodes. */
4709 current_scope->bindings = 0;
4711 /* This function is only called if there was *something* on the
4715 /* A parameter list consisting solely of 'void' indicates that the
4716 function takes no arguments. But if the 'void' is qualified
4717 (by 'const' or 'volatile'), or has a storage class specifier
4718 ('register'), then the behavior is undefined; issue an error.
4719 Typedefs for 'void' are OK (see DR#157). */
4720 if (b->prev == 0 /* one binding */
4721 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4722 && !DECL_NAME (b->decl) /* anonymous */
4723 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4725 if (TREE_THIS_VOLATILE (b->decl)
4726 || TREE_READONLY (b->decl)
4727 || C_DECL_REGISTER (b->decl))
4728 error ("%<void%> as only parameter may not be qualified");
4730 /* There cannot be an ellipsis. */
4732 error ("%<void%> must be the only parameter");
4734 arg_info->types = void_list_node;
4739 types = void_list_node;
4741 /* Break up the bindings list into parms, tags, types, and others;
4742 apply sanity checks; purge the name-to-decl bindings. */
4745 tree decl = b->decl;
4746 tree type = TREE_TYPE (decl);
4747 const char *keyword;
4749 switch (TREE_CODE (decl))
4754 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4755 I_SYMBOL_BINDING (b->id) = b->shadowed;
4758 /* Check for forward decls that never got their actual decl. */
4759 if (TREE_ASM_WRITTEN (decl))
4760 error ("%Jparameter %qD has just a forward declaration",
4762 /* Check for (..., void, ...) and issue an error. */
4763 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4765 if (!gave_void_only_once_err)
4767 error ("%<void%> must be the only parameter");
4768 gave_void_only_once_err = true;
4773 /* Valid parameter, add it to the list. */
4774 TREE_CHAIN (decl) = parms;
4777 /* Since there is a prototype, args are passed in their
4778 declared types. The back end may override this later. */
4779 DECL_ARG_TYPE (decl) = type;
4780 types = tree_cons (0, type, types);
4784 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4785 case UNION_TYPE: keyword = "union"; goto tag;
4786 case RECORD_TYPE: keyword = "struct"; goto tag;
4788 /* Types may not have tag-names, in which case the type
4789 appears in the bindings list with b->id NULL. */
4792 gcc_assert (I_TAG_BINDING (b->id) == b);
4793 I_TAG_BINDING (b->id) = b->shadowed;
4796 /* Warn about any struct, union or enum tags defined in a
4797 parameter list. The scope of such types is limited to
4798 the parameter list, which is rarely if ever desirable
4799 (it's impossible to call such a function with type-
4800 correct arguments). An anonymous union parm type is
4801 meaningful as a GNU extension, so don't warn for that. */
4802 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4805 /* The %s will be one of 'struct', 'union', or 'enum'. */
4806 warning ("%<%s %E%> declared inside parameter list",
4809 /* The %s will be one of 'struct', 'union', or 'enum'. */
4810 warning ("anonymous %s declared inside parameter list",
4813 if (!explained_incomplete_types)
4815 warning ("its scope is only this definition or declaration,"
4816 " which is probably not what you want");
4817 explained_incomplete_types = true;
4821 tags = tree_cons (b->id, decl, tags);
4827 /* CONST_DECLs appear here when we have an embedded enum,
4828 and TYPE_DECLs appear here when we have an embedded struct
4829 or union. No warnings for this - we already warned about the
4830 type itself. FUNCTION_DECLs appear when there is an implicit
4831 function declaration in the parameter list. */
4833 TREE_CHAIN (decl) = others;
4838 /* error_mark_node appears here when we have an undeclared
4839 variable. Just throw it away. */
4842 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4843 I_SYMBOL_BINDING (b->id) = b->shadowed;
4847 /* Other things that might be encountered. */
4854 b = free_binding_and_advance (b);
4857 arg_info->parms = parms;
4858 arg_info->tags = tags;
4859 arg_info->types = types;
4860 arg_info->others = others;
4864 /* Get the struct, enum or union (CODE says which) with tag NAME.
4865 Define the tag as a forward-reference if it is not defined.
4866 Return a c_typespec structure for the type specifier. */
4869 parser_xref_tag (enum tree_code code, tree name)
4871 struct c_typespec ret;
4872 /* If a cross reference is requested, look up the type
4873 already defined for this tag and return it. */
4875 tree ref = lookup_tag (code, name, 0);
4876 /* If this is the right type of tag, return what we found.
4877 (This reference will be shadowed by shadow_tag later if appropriate.)
4878 If this is the wrong type of tag, do not return it. If it was the
4879 wrong type in the same scope, we will have had an error
4880 message already; if in a different scope and declaring
4881 a name, pending_xref_error will give an error message; but if in a
4882 different scope and not declaring a name, this tag should
4883 shadow the previous declaration of a different type of tag, and
4884 this would not work properly if we return the reference found.
4885 (For example, with "struct foo" in an outer scope, "union foo;"
4886 must shadow that tag with a new one of union type.) */
4887 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
4888 if (ref && TREE_CODE (ref) == code)
4894 /* If no such tag is yet defined, create a forward-reference node
4895 and record it as the "definition".
4896 When a real declaration of this type is found,
4897 the forward-reference will be altered into a real type. */
4899 ref = make_node (code);
4900 if (code == ENUMERAL_TYPE)
4902 /* Give the type a default layout like unsigned int
4903 to avoid crashing if it does not get defined. */
4904 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4905 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4906 TYPE_USER_ALIGN (ref) = 0;
4907 TYPE_UNSIGNED (ref) = 1;
4908 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4909 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4910 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4913 pushtag (name, ref);
4919 /* Get the struct, enum or union (CODE says which) with tag NAME.
4920 Define the tag as a forward-reference if it is not defined.
4921 Return a tree for the type. */
4924 xref_tag (enum tree_code code, tree name)
4926 return parser_xref_tag (code, name).spec;
4929 /* Make sure that the tag NAME is defined *in the current scope*
4930 at least as a forward reference.
4931 CODE says which kind of tag NAME ought to be. */
4934 start_struct (enum tree_code code, tree name)
4936 /* If there is already a tag defined at this scope
4937 (as a forward reference), just return it. */
4942 ref = lookup_tag (code, name, 1);
4943 if (ref && TREE_CODE (ref) == code)
4945 if (TYPE_SIZE (ref))
4947 if (code == UNION_TYPE)
4948 error ("redefinition of %<union %E%>", name);
4950 error ("redefinition of %<struct %E%>", name);
4952 else if (C_TYPE_BEING_DEFINED (ref))
4954 if (code == UNION_TYPE)
4955 error ("nested redefinition of %<union %E%>", name);
4957 error ("nested redefinition of %<struct %E%>", name);
4962 /* Otherwise create a forward-reference just so the tag is in scope. */
4964 ref = make_node (code);
4965 pushtag (name, ref);
4968 C_TYPE_BEING_DEFINED (ref) = 1;
4969 TYPE_PACKED (ref) = flag_pack_struct;
4973 /* Process the specs, declarator and width (NULL if omitted)
4974 of a structure component, returning a FIELD_DECL node.
4975 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4977 This is done during the parsing of the struct declaration.
4978 The FIELD_DECL nodes are chained together and the lot of them
4979 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4982 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
4987 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
4988 && width == NULL_TREE)
4990 /* This is an unnamed decl.
4992 If we have something of the form "union { list } ;" then this
4993 is the anonymous union extension. Similarly for struct.
4995 If this is something of the form "struct foo;", then
4996 If MS extensions are enabled, this is handled as an
4998 Otherwise this is a forward declaration of a structure tag.
5000 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5001 If MS extensions are enabled and foo names a structure, then
5002 again this is an anonymous struct.
5003 Otherwise this is an error.
5005 Oh what a horrid tangled web we weave. I wonder if MS consciously
5006 took this from Plan 9 or if it was an accident of implementation
5007 that took root before someone noticed the bug... */
5009 tree type = declspecs->type;
5010 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5011 || TREE_CODE (type) == UNION_TYPE);
5015 && (flag_ms_extensions || !declspecs->typedef_p))
5017 if (flag_ms_extensions)
5021 else if (TYPE_NAME (type) == NULL)
5028 pedwarn ("declaration does not declare anything");
5032 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5035 value = grokdeclarator (declarator, declspecs, FIELD, false,
5036 width ? &width : NULL);
5038 finish_decl (value, NULL_TREE, NULL_TREE);
5039 DECL_INITIAL (value) = width;
5044 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5045 the list such that this does not present a problem later. */
5048 detect_field_duplicates (tree fieldlist)
5053 /* First, see if there are more than "a few" fields.
5054 This is trivially true if there are zero or one fields. */
5057 x = TREE_CHAIN (fieldlist);
5063 } while (timeout > 0 && x);
5065 /* If there were "few" fields, avoid the overhead of allocating
5066 a hash table. Instead just do the nested traversal thing. */
5069 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5072 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5073 if (DECL_NAME (y) == DECL_NAME (x))
5075 error ("%Jduplicate member %qD", x, x);
5076 DECL_NAME (x) = NULL_TREE;
5082 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5085 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5086 if ((y = DECL_NAME (x)) != 0)
5088 slot = htab_find_slot (htab, y, INSERT);
5091 error ("%Jduplicate member %qD", x, x);
5092 DECL_NAME (x) = NULL_TREE;
5101 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5102 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5103 ATTRIBUTES are attributes to be applied to the structure. */
5106 finish_struct (tree t, tree fieldlist, tree attributes)
5109 bool toplevel = file_scope == current_scope;
5110 int saw_named_field;
5112 /* If this type was previously laid out as a forward reference,
5113 make sure we lay it out again. */
5117 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5121 for (x = fieldlist; x; x = TREE_CHAIN (x))
5122 if (DECL_NAME (x) != 0)
5127 if (TREE_CODE (t) == UNION_TYPE)
5130 pedwarn ("union has no named members");
5132 pedwarn ("union has no members");
5137 pedwarn ("struct has no named members");
5139 pedwarn ("struct has no members");
5144 /* Install struct as DECL_CONTEXT of each field decl.
5145 Also process specified field sizes, found in the DECL_INITIAL,
5146 storing 0 there after the type has been changed to precision equal
5147 to its width, rather than the precision of the specified standard
5148 type. (Correct layout requires the original type to have been preserved
5151 saw_named_field = 0;
5152 for (x = fieldlist; x; x = TREE_CHAIN (x))
5154 DECL_CONTEXT (x) = t;
5155 DECL_PACKED (x) |= TYPE_PACKED (t);
5157 /* If any field is const, the structure type is pseudo-const. */
5158 if (TREE_READONLY (x))
5159 C_TYPE_FIELDS_READONLY (t) = 1;
5162 /* A field that is pseudo-const makes the structure likewise. */
5163 tree t1 = TREE_TYPE (x);
5164 while (TREE_CODE (t1) == ARRAY_TYPE)
5165 t1 = TREE_TYPE (t1);
5166 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5167 && C_TYPE_FIELDS_READONLY (t1))
5168 C_TYPE_FIELDS_READONLY (t) = 1;
5171 /* Any field that is volatile means variables of this type must be
5172 treated in some ways as volatile. */
5173 if (TREE_THIS_VOLATILE (x))
5174 C_TYPE_FIELDS_VOLATILE (t) = 1;
5176 /* Any field of nominal variable size implies structure is too. */
5177 if (C_DECL_VARIABLE_SIZE (x))
5178 C_TYPE_VARIABLE_SIZE (t) = 1;
5180 if (DECL_INITIAL (x))
5182 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5183 DECL_SIZE (x) = bitsize_int (width);
5184 DECL_BIT_FIELD (x) = 1;
5185 SET_DECL_C_BIT_FIELD (x);
5188 /* Detect flexible array member in an invalid context. */
5189 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5190 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5191 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5192 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5194 if (TREE_CODE (t) == UNION_TYPE)
5196 error ("%Jflexible array member in union", x);
5197 TREE_TYPE (x) = error_mark_node;
5199 else if (TREE_CHAIN (x) != NULL_TREE)
5201 error ("%Jflexible array member not at end of struct", x);
5202 TREE_TYPE (x) = error_mark_node;
5204 else if (!saw_named_field)
5206 error ("%Jflexible array member in otherwise empty struct", x);
5207 TREE_TYPE (x) = error_mark_node;
5211 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5212 && flexible_array_type_p (TREE_TYPE (x)))
5213 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5216 saw_named_field = 1;
5219 detect_field_duplicates (fieldlist);
5221 /* Now we have the nearly final fieldlist. Record it,
5222 then lay out the structure or union (including the fields). */
5224 TYPE_FIELDS (t) = fieldlist;
5228 /* Give bit-fields their proper types. */
5230 tree *fieldlistp = &fieldlist;
5232 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5233 && TREE_TYPE (*fieldlistp) != error_mark_node)
5235 unsigned HOST_WIDE_INT width
5236 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5237 tree type = TREE_TYPE (*fieldlistp);
5238 if (width != TYPE_PRECISION (type))
5240 TREE_TYPE (*fieldlistp)
5241 = build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
5242 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5244 DECL_INITIAL (*fieldlistp) = 0;
5247 fieldlistp = &TREE_CHAIN (*fieldlistp);
5250 /* Now we have the truly final field list.
5251 Store it in this type and in the variants. */
5253 TYPE_FIELDS (t) = fieldlist;
5255 /* If there are lots of fields, sort so we can look through them fast.
5256 We arbitrarily consider 16 or more elts to be "a lot". */
5261 for (x = fieldlist; x; x = TREE_CHAIN (x))
5263 if (len > 15 || DECL_NAME (x) == NULL)
5271 struct lang_type *space;
5272 struct sorted_fields_type *space2;
5274 len += list_length (x);
5276 /* Use the same allocation policy here that make_node uses, to
5277 ensure that this lives as long as the rest of the struct decl.
5278 All decls in an inline function need to be saved. */
5280 space = GGC_CNEW (struct lang_type);
5281 space2 = GGC_NEWVAR (struct sorted_fields_type,
5282 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5286 field_array = &space2->elts[0];
5287 for (x = fieldlist; x; x = TREE_CHAIN (x))
5289 field_array[len++] = x;
5291 /* If there is anonymous struct or union, break out of the loop. */
5292 if (DECL_NAME (x) == NULL)
5295 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5298 TYPE_LANG_SPECIFIC (t) = space;
5299 TYPE_LANG_SPECIFIC (t)->s->len = len;
5300 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5301 qsort (field_array, len, sizeof (tree), field_decl_cmp);
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. */
5326 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5330 tree decl = TREE_VALUE (x);
5331 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5332 layout_array_type (TREE_TYPE (decl));
5333 if (TREE_CODE (decl) != TYPE_DECL)
5335 layout_decl (decl, 0);
5336 if (c_dialect_objc ())
5337 objc_check_decl (decl);
5338 rest_of_decl_compilation (decl, toplevel, 0);
5343 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5345 /* Finish debugging output for this type. */
5346 rest_of_type_compilation (t, toplevel);
5348 /* If we're inside a function proper, i.e. not file-scope and not still
5349 parsing parameters, then arrange for the size of a variable sized type
5351 if (cur_stmt_list && variably_modified_type_p (t, NULL))
5352 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5357 /* Lay out the type T, and its element type, and so on. */
5360 layout_array_type (tree t)
5362 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5363 layout_array_type (TREE_TYPE (t));
5367 /* Begin compiling the definition of an enumeration type.
5368 NAME is its name (or null if anonymous).
5369 Returns the type object, as yet incomplete.
5370 Also records info about it so that build_enumerator
5371 may be used to declare the individual values as they are read. */
5374 start_enum (tree name)
5378 /* If this is the real definition for a previous forward reference,
5379 fill in the contents in the same object that used to be the
5380 forward reference. */
5383 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5385 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5387 enumtype = make_node (ENUMERAL_TYPE);
5388 pushtag (name, enumtype);
5391 if (C_TYPE_BEING_DEFINED (enumtype))
5392 error ("nested redefinition of %<enum %E%>", name);
5394 C_TYPE_BEING_DEFINED (enumtype) = 1;
5396 if (TYPE_VALUES (enumtype) != 0)
5398 /* This enum is a named one that has been declared already. */
5399 error ("redeclaration of %<enum %E%>", name);
5401 /* Completely replace its old definition.
5402 The old enumerators remain defined, however. */
5403 TYPE_VALUES (enumtype) = 0;
5406 enum_next_value = integer_zero_node;
5409 if (flag_short_enums)
5410 TYPE_PACKED (enumtype) = 1;
5415 /* After processing and defining all the values of an enumeration type,
5416 install their decls in the enumeration type and finish it off.
5417 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5418 and ATTRIBUTES are the specified attributes.
5419 Returns ENUMTYPE. */
5422 finish_enum (tree enumtype, tree values, tree attributes)
5425 tree minnode = 0, maxnode = 0;
5426 int precision, unsign;
5427 bool toplevel = (file_scope == current_scope);
5428 struct lang_type *lt;
5430 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5432 /* Calculate the maximum value of any enumerator in this type. */
5434 if (values == error_mark_node)
5435 minnode = maxnode = integer_zero_node;
5438 minnode = maxnode = TREE_VALUE (values);
5439 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5441 tree value = TREE_VALUE (pair);
5442 if (tree_int_cst_lt (maxnode, value))
5444 if (tree_int_cst_lt (value, minnode))
5449 /* Construct the final type of this enumeration. It is the same
5450 as one of the integral types - the narrowest one that fits, except
5451 that normally we only go as narrow as int - and signed iff any of
5452 the values are negative. */
5453 unsign = (tree_int_cst_sgn (minnode) >= 0);
5454 precision = MAX (min_precision (minnode, unsign),
5455 min_precision (maxnode, unsign));
5457 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5459 tem = c_common_type_for_size (precision, unsign);
5462 warning ("enumeration values exceed range of largest integer");
5463 tem = long_long_integer_type_node;
5467 tem = unsign ? unsigned_type_node : integer_type_node;
5469 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5470 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5471 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5472 TYPE_SIZE (enumtype) = 0;
5474 /* If the precision of the type was specific with an attribute and it
5475 was too small, give an error. Otherwise, use it. */
5476 if (TYPE_PRECISION (enumtype))
5478 if (precision > TYPE_PRECISION (enumtype))
5479 error ("specified mode too small for enumeral values");
5482 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5484 layout_type (enumtype);
5486 if (values != error_mark_node)
5488 /* Change the type of the enumerators to be the enum type. We
5489 need to do this irrespective of the size of the enum, for
5490 proper type checking. Replace the DECL_INITIALs of the
5491 enumerators, and the value slots of the list, with copies
5492 that have the enum type; they cannot be modified in place
5493 because they may be shared (e.g. integer_zero_node) Finally,
5494 change the purpose slots to point to the names of the decls. */
5495 for (pair = values; pair; pair = TREE_CHAIN (pair))
5497 tree enu = TREE_PURPOSE (pair);
5498 tree ini = DECL_INITIAL (enu);
5500 TREE_TYPE (enu) = enumtype;
5502 /* The ISO C Standard mandates enumerators to have type int,
5503 even though the underlying type of an enum type is
5504 unspecified. Here we convert any enumerators that fit in
5505 an int to type int, to avoid promotions to unsigned types
5506 when comparing integers with enumerators that fit in the
5507 int range. When -pedantic is given, build_enumerator()
5508 would have already taken care of those that don't fit. */
5509 if (int_fits_type_p (ini, integer_type_node))
5510 tem = integer_type_node;
5513 ini = convert (tem, ini);
5515 DECL_INITIAL (enu) = ini;
5516 TREE_PURPOSE (pair) = DECL_NAME (enu);
5517 TREE_VALUE (pair) = ini;
5520 TYPE_VALUES (enumtype) = values;
5523 /* Record the min/max values so that we can warn about bit-field
5524 enumerations that are too small for the values. */
5525 lt = GGC_CNEW (struct lang_type);
5526 lt->enum_min = minnode;
5527 lt->enum_max = maxnode;
5528 TYPE_LANG_SPECIFIC (enumtype) = lt;
5530 /* Fix up all variant types of this enum type. */
5531 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5533 if (tem == enumtype)
5535 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5536 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5537 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5538 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5539 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5540 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5541 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5542 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5543 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5544 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5545 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5548 /* Finish debugging output for this type. */
5549 rest_of_type_compilation (enumtype, toplevel);
5554 /* Build and install a CONST_DECL for one value of the
5555 current enumeration type (one that was begun with start_enum).
5556 Return a tree-list containing the CONST_DECL and its value.
5557 Assignment of sequential values by default is handled here. */
5560 build_enumerator (tree name, tree value)
5564 /* Validate and default VALUE. */
5568 /* Don't issue more errors for error_mark_node (i.e. an
5569 undeclared identifier) - just ignore the value expression. */
5570 if (value == error_mark_node)
5572 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5573 || TREE_CODE (value) != INTEGER_CST)
5575 error ("enumerator value for %qE is not an integer constant", name);
5580 value = default_conversion (value);
5581 constant_expression_warning (value);
5585 /* Default based on previous value. */
5586 /* It should no longer be possible to have NON_LVALUE_EXPR
5590 value = enum_next_value;
5592 error ("overflow in enumeration values");
5595 if (pedantic && !int_fits_type_p (value, integer_type_node))
5597 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5598 /* XXX This causes -pedantic to change the meaning of the program.
5599 Remove? -zw 2004-03-15 */
5600 value = convert (integer_type_node, value);
5603 /* Set basis for default for next value. */
5604 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5605 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5607 /* Now create a declaration for the enum value name. */
5609 type = TREE_TYPE (value);
5610 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5611 TYPE_PRECISION (integer_type_node)),
5612 (TYPE_PRECISION (type)
5613 >= TYPE_PRECISION (integer_type_node)
5614 && TYPE_UNSIGNED (type)));
5616 decl = build_decl (CONST_DECL, name, type);
5617 DECL_INITIAL (decl) = convert (type, value);
5620 return tree_cons (decl, value, NULL_TREE);
5624 /* Create the FUNCTION_DECL for a function definition.
5625 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5626 the declaration; they describe the function's name and the type it returns,
5627 but twisted together in a fashion that parallels the syntax of C.
5629 This function creates a binding context for the function body
5630 as well as setting up the FUNCTION_DECL in current_function_decl.
5632 Returns 1 on success. If the DECLARATOR is not suitable for a function
5633 (it defines a datum instead), we return 0, which tells
5634 yyparse to report a parse error. */
5637 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5640 tree decl1, old_decl;
5641 tree restype, resdecl;
5642 struct c_label_context *nstack;
5644 current_function_returns_value = 0; /* Assume, until we see it does. */
5645 current_function_returns_null = 0;
5646 current_function_returns_abnormally = 0;
5647 warn_about_return_type = 0;
5648 current_extern_inline = 0;
5649 c_switch_stack = NULL;
5651 nstack = XOBNEW (&parser_obstack, struct c_label_context);
5652 nstack->labels_def = NULL;
5653 nstack->labels_used = NULL;
5654 nstack->next = label_context_stack;
5655 label_context_stack = nstack;
5657 /* Indicate no valid break/continue context by setting these variables
5658 to some non-null, non-label value. We'll notice and emit the proper
5659 error message in c_finish_bc_stmt. */
5660 c_break_label = c_cont_label = size_zero_node;
5662 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5664 /* If the declarator is not suitable for a function definition,
5665 cause a syntax error. */
5669 decl_attributes (&decl1, attributes, 0);
5671 if (DECL_DECLARED_INLINE_P (decl1)
5672 && DECL_UNINLINABLE (decl1)
5673 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5674 warning ("%Jinline function %qD given attribute noinline", decl1, decl1);
5676 announce_function (decl1);
5678 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5680 error ("return type is an incomplete type");
5681 /* Make it return void instead. */
5683 = build_function_type (void_type_node,
5684 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5687 if (warn_about_return_type)
5688 pedwarn_c99 ("return type defaults to %<int%>");
5690 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5691 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5692 DECL_INITIAL (decl1) = error_mark_node;
5694 /* If this definition isn't a prototype and we had a prototype declaration
5695 before, copy the arg type info from that prototype. */
5696 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5697 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5698 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5699 TREE_TYPE (TREE_TYPE (old_decl)))
5700 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5702 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5704 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5707 /* Optionally warn of old-fashioned def with no previous prototype. */
5708 if (warn_strict_prototypes
5709 && old_decl != error_mark_node
5710 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5711 && C_DECL_ISNT_PROTOTYPE (old_decl))
5712 warning ("function declaration isn%'t a prototype");
5713 /* Optionally warn of any global def with no previous prototype. */
5714 else if (warn_missing_prototypes
5715 && old_decl != error_mark_node
5716 && TREE_PUBLIC (decl1)
5717 && !MAIN_NAME_P (DECL_NAME (decl1))
5718 && C_DECL_ISNT_PROTOTYPE (old_decl))
5719 warning ("%Jno previous prototype for %qD", decl1, decl1);
5720 /* Optionally warn of any def with no previous prototype
5721 if the function has already been used. */
5722 else if (warn_missing_prototypes
5724 && old_decl != error_mark_node
5725 && TREE_USED (old_decl)
5726 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5727 warning ("%J%qD was used with no prototype before its definition",
5729 /* Optionally warn of any global def with no previous declaration. */
5730 else if (warn_missing_declarations
5731 && TREE_PUBLIC (decl1)
5733 && !MAIN_NAME_P (DECL_NAME (decl1)))
5734 warning ("%Jno previous declaration for %qD", decl1, decl1);
5735 /* Optionally warn of any def with no previous declaration
5736 if the function has already been used. */
5737 else if (warn_missing_declarations
5739 && old_decl != error_mark_node
5740 && TREE_USED (old_decl)
5741 && C_DECL_IMPLICIT (old_decl))
5742 warning ("%J%qD was used with no declaration before its definition",
5745 /* This is a definition, not a reference.
5746 So normally clear DECL_EXTERNAL.
5747 However, `extern inline' acts like a declaration
5748 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5749 DECL_EXTERNAL (decl1) = current_extern_inline;
5751 /* This function exists in static storage.
5752 (This does not mean `static' in the C sense!) */
5753 TREE_STATIC (decl1) = 1;
5755 /* A nested function is not global. */
5756 if (current_function_decl != 0)
5757 TREE_PUBLIC (decl1) = 0;
5759 /* This is the earliest point at which we might know the assembler
5760 name of the function. Thus, if it's set before this, die horribly. */
5761 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5763 /* If #pragma weak was used, mark the decl weak now. */
5764 if (current_scope == file_scope)
5765 maybe_apply_pragma_weak (decl1);
5767 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5768 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5773 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5774 != integer_type_node)
5775 pedwarn ("%Jreturn type of %qD is not %<int%>", decl1, decl1);
5777 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5778 args = TREE_CHAIN (args))
5780 tree type = args ? TREE_VALUE (args) : 0;
5782 if (type == void_type_node)
5789 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5790 pedwarn ("%Jfirst argument of %qD should be %<int%>",
5795 if (TREE_CODE (type) != POINTER_TYPE
5796 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5797 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5799 pedwarn ("%Jsecond argument of %qD should be %<char **%>",
5804 if (TREE_CODE (type) != POINTER_TYPE
5805 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5806 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5808 pedwarn ("%Jthird argument of %qD should probably be "
5809 "%<char **%>", decl1, decl1);
5814 /* It is intentional that this message does not mention the third
5815 argument because it's only mentioned in an appendix of the
5817 if (argct > 0 && (argct < 2 || argct > 3))
5818 pedwarn ("%J%qD takes only zero or two arguments", decl1, decl1);
5820 if (!TREE_PUBLIC (decl1))
5821 pedwarn ("%J%qD is normally a non-static function", decl1, decl1);
5824 /* Record the decl so that the function name is defined.
5825 If we already have a decl for this name, and it is a FUNCTION_DECL,
5826 use the old decl. */
5828 current_function_decl = pushdecl (decl1);
5831 declare_parm_level ();
5833 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5834 /* Promote the value to int before returning it. */
5835 if (c_promoting_integer_type_p (restype))
5837 /* It retains unsignedness if not really getting wider. */
5838 if (TYPE_UNSIGNED (restype)
5839 && (TYPE_PRECISION (restype)
5840 == TYPE_PRECISION (integer_type_node)))
5841 restype = unsigned_type_node;
5843 restype = integer_type_node;
5846 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
5847 DECL_ARTIFICIAL (resdecl) = 1;
5848 DECL_IGNORED_P (resdecl) = 1;
5849 DECL_RESULT (current_function_decl) = resdecl;
5851 start_fname_decls ();
5856 /* Subroutine of store_parm_decls which handles new-style function
5857 definitions (prototype format). The parms already have decls, so we
5858 need only record them as in effect and complain if any redundant
5859 old-style parm decls were written. */
5861 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
5865 if (current_scope->bindings)
5867 error ("%Jold-style parameter declarations in prototyped "
5868 "function definition", fndecl);
5870 /* Get rid of the old-style declarations. */
5874 /* Don't issue this warning for nested functions, and don't issue this
5875 warning if we got here because ARG_INFO_TYPES was error_mark_node
5876 (this happens when a function definition has just an ellipsis in
5877 its parameter list). */
5878 else if (warn_traditional && !in_system_header && !current_function_scope
5879 && arg_info->types != error_mark_node)
5880 warning ("%Jtraditional C rejects ISO C style function definitions",
5883 /* Now make all the parameter declarations visible in the function body.
5884 We can bypass most of the grunt work of pushdecl. */
5885 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
5887 DECL_CONTEXT (decl) = current_function_decl;
5888 if (DECL_NAME (decl))
5889 bind (DECL_NAME (decl), decl, current_scope,
5890 /*invisible=*/false, /*nested=*/false);
5892 error ("%Jparameter name omitted", decl);
5895 /* Record the parameter list in the function declaration. */
5896 DECL_ARGUMENTS (fndecl) = arg_info->parms;
5898 /* Now make all the ancillary declarations visible, likewise. */
5899 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
5901 DECL_CONTEXT (decl) = current_function_decl;
5902 if (DECL_NAME (decl))
5903 bind (DECL_NAME (decl), decl, current_scope,
5904 /*invisible=*/false, /*nested=*/false);
5907 /* And all the tag declarations. */
5908 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
5909 if (TREE_PURPOSE (decl))
5910 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
5911 /*invisible=*/false, /*nested=*/false);
5914 /* Subroutine of store_parm_decls which handles old-style function
5915 definitions (separate parameter list and declarations). */
5918 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
5920 struct c_binding *b;
5921 tree parm, decl, last;
5922 tree parmids = arg_info->parms;
5924 /* We use DECL_WEAK as a flag to show which parameters have been
5925 seen already, since it is not used on PARM_DECL. */
5926 #ifdef ENABLE_CHECKING
5927 for (b = current_scope->bindings; b; b = b->prev)
5928 gcc_assert (TREE_CODE (b->decl) != PARM_DECL || !DECL_WEAK (b->decl));
5931 if (warn_old_style_definition && !in_system_header)
5932 warning ("%Jold-style function definition", fndecl);
5934 /* Match each formal parameter name with its declaration. Save each
5935 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5936 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5938 if (TREE_VALUE (parm) == 0)
5940 error ("%Jparameter name missing from parameter list", fndecl);
5941 TREE_PURPOSE (parm) = 0;
5945 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
5946 if (b && B_IN_CURRENT_SCOPE (b))
5949 /* If we got something other than a PARM_DECL it is an error. */
5950 if (TREE_CODE (decl) != PARM_DECL)
5951 error ("%J%qD declared as a non-parameter", decl, decl);
5952 /* If the declaration is already marked, we have a duplicate
5953 name. Complain and ignore the duplicate. */
5954 else if (DECL_WEAK (decl))
5956 error ("%Jmultiple parameters named %qD", decl, decl);
5957 TREE_PURPOSE (parm) = 0;
5960 /* If the declaration says "void", complain and turn it into
5962 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5964 error ("%Jparameter %qD declared with void type", decl, decl);
5965 TREE_TYPE (decl) = integer_type_node;
5966 DECL_ARG_TYPE (decl) = integer_type_node;
5967 layout_decl (decl, 0);
5970 /* If no declaration found, default to int. */
5973 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5974 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5975 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5979 pedwarn ("%Jtype of %qD defaults to %<int%>", decl, decl);
5980 else if (extra_warnings)
5981 warning ("%Jtype of %qD defaults to %<int%>", decl, decl);
5984 TREE_PURPOSE (parm) = decl;
5985 DECL_WEAK (decl) = 1;
5988 /* Now examine the parms chain for incomplete declarations
5989 and declarations with no corresponding names. */
5991 for (b = current_scope->bindings; b; b = b->prev)
5994 if (TREE_CODE (parm) != PARM_DECL)
5997 if (TREE_TYPE (parm) != error_mark_node
5998 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6000 error ("%Jparameter %qD has incomplete type", parm, parm);
6001 TREE_TYPE (parm) = error_mark_node;
6004 if (!DECL_WEAK (parm))
6006 error ("%Jdeclaration for parameter %qD but no such parameter",
6009 /* Pretend the parameter was not missing.
6010 This gets us to a standard state and minimizes
6011 further error messages. */
6012 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6016 /* Chain the declarations together in the order of the list of
6017 names. Store that chain in the function decl, replacing the
6018 list of names. Update the current scope to match. */
6019 DECL_ARGUMENTS (fndecl) = 0;
6021 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6022 if (TREE_PURPOSE (parm))
6024 if (parm && TREE_PURPOSE (parm))
6026 last = TREE_PURPOSE (parm);
6027 DECL_ARGUMENTS (fndecl) = last;
6028 DECL_WEAK (last) = 0;
6030 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6031 if (TREE_PURPOSE (parm))
6033 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6034 last = TREE_PURPOSE (parm);
6035 DECL_WEAK (last) = 0;
6037 TREE_CHAIN (last) = 0;
6040 /* If there was a previous prototype,
6041 set the DECL_ARG_TYPE of each argument according to
6042 the type previously specified, and report any mismatches. */
6044 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6047 for (parm = DECL_ARGUMENTS (fndecl),
6048 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6049 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6050 != void_type_node));
6051 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6053 if (parm == 0 || type == 0
6054 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6056 error ("number of arguments doesn%'t match prototype");
6057 error ("%Hprototype declaration",
6058 ¤t_function_prototype_locus);
6061 /* Type for passing arg must be consistent with that
6062 declared for the arg. ISO C says we take the unqualified
6063 type for parameters declared with qualified type. */
6064 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6065 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6067 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6068 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6070 /* Adjust argument to match prototype. E.g. a previous
6071 `int foo(float);' prototype causes
6072 `int foo(x) float x; {...}' to be treated like
6073 `int foo(float x) {...}'. This is particularly
6074 useful for argument types like uid_t. */
6075 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6077 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6078 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6079 && TYPE_PRECISION (TREE_TYPE (parm))
6080 < TYPE_PRECISION (integer_type_node))
6081 DECL_ARG_TYPE (parm) = integer_type_node;
6085 pedwarn ("promoted argument %qD "
6086 "doesn%'t match prototype", parm);
6087 pedwarn ("%Hprototype declaration",
6088 ¤t_function_prototype_locus);
6093 error ("argument %qD doesn%'t match prototype", parm);
6094 error ("%Hprototype declaration",
6095 ¤t_function_prototype_locus);
6099 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6102 /* Otherwise, create a prototype that would match. */
6106 tree actual = 0, last = 0, type;
6108 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6110 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6112 TREE_CHAIN (last) = type;
6117 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6119 TREE_CHAIN (last) = type;
6123 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6124 of the type of this function, but we need to avoid having this
6125 affect the types of other similarly-typed functions, so we must
6126 first force the generation of an identical (but separate) type
6127 node for the relevant function type. The new node we create
6128 will be a variant of the main variant of the original function
6131 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6133 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6137 /* Store parameter declarations passed in ARG_INFO into the current
6138 function declaration. */
6141 store_parm_decls_from (struct c_arg_info *arg_info)
6143 current_function_arg_info = arg_info;
6144 store_parm_decls ();
6147 /* Store the parameter declarations into the current function declaration.
6148 This is called after parsing the parameter declarations, before
6149 digesting the body of the function.
6151 For an old-style definition, construct a prototype out of the old-style
6152 parameter declarations and inject it into the function's type. */
6155 store_parm_decls (void)
6157 tree fndecl = current_function_decl;
6160 /* The argument information block for FNDECL. */
6161 struct c_arg_info *arg_info = current_function_arg_info;
6162 current_function_arg_info = 0;
6164 /* True if this definition is written with a prototype. Note:
6165 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6166 list in a function definition as equivalent to (void) -- an
6167 empty argument list specifies the function has no parameters,
6168 but only (void) sets up a prototype for future calls. */
6169 proto = arg_info->types != 0;
6172 store_parm_decls_newstyle (fndecl, arg_info);
6174 store_parm_decls_oldstyle (fndecl, arg_info);
6176 /* The next call to push_scope will be a function body. */
6178 next_is_function_body = true;
6180 /* Write a record describing this function definition to the prototypes
6181 file (if requested). */
6183 gen_aux_info_record (fndecl, 1, 0, proto);
6185 /* Initialize the RTL code for the function. */
6186 allocate_struct_function (fndecl);
6188 /* Begin the statement tree for this function. */
6189 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6191 /* ??? Insert the contents of the pending sizes list into the function
6192 to be evaluated. The only reason left to have this is
6193 void foo(int n, int array[n++])
6194 because we throw away the array type in favor of a pointer type, and
6195 thus won't naturally see the SAVE_EXPR containing the increment. All
6196 other pending sizes would be handled by gimplify_parameters. */
6199 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6200 add_stmt (TREE_VALUE (t));
6203 /* Even though we're inside a function body, we still don't want to
6204 call expand_expr to calculate the size of a variable-sized array.
6205 We haven't necessarily assigned RTL to all variables yet, so it's
6206 not safe to try to expand expressions involving them. */
6207 cfun->x_dont_save_pending_sizes_p = 1;
6210 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6214 c_warn_unused_result_recursively (tree fndecl)
6216 struct cgraph_node *cgn;
6218 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6219 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6221 /* Finalize all nested functions now. */
6222 cgn = cgraph_node (fndecl);
6223 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6224 c_warn_unused_result_recursively (cgn->decl);
6227 /* Finish up a function declaration and compile that function
6228 all the way to assembler language output. The free the storage
6229 for the function definition.
6231 This is called after parsing the body of the function definition. */
6234 finish_function (void)
6236 tree fndecl = current_function_decl;
6238 label_context_stack = label_context_stack->next;
6240 if (TREE_CODE (fndecl) == FUNCTION_DECL
6241 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6243 tree args = DECL_ARGUMENTS (fndecl);
6244 for (; args; args = TREE_CHAIN (args))
6246 tree type = TREE_TYPE (args);
6247 if (INTEGRAL_TYPE_P (type)
6248 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6249 DECL_ARG_TYPE (args) = integer_type_node;
6253 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6254 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6256 /* Must mark the RESULT_DECL as being in this function. */
6258 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6259 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6261 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6263 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6264 != integer_type_node)
6266 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6267 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6269 pedwarn ("%Jreturn type of %qD is not %<int%>", fndecl, fndecl);
6275 tree stmt = c_finish_return (integer_zero_node);
6276 /* Hack. We don't want the middle-end to warn that this
6277 return is unreachable, so put the statement on the
6279 #ifdef USE_MAPPED_LOCATION
6280 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
6282 annotate_with_file_line (stmt, input_filename, 0);
6288 /* Tie off the statement tree for this function. */
6289 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6291 finish_fname_decls ();
6293 /* Complain if there's just no return statement. */
6294 if (warn_return_type
6295 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6296 && !current_function_returns_value && !current_function_returns_null
6297 /* Don't complain if we abort. */
6298 && !current_function_returns_abnormally
6299 /* Don't warn for main(). */
6300 && !MAIN_NAME_P (DECL_NAME (fndecl))
6301 /* Or if they didn't actually specify a return type. */
6302 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6303 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6304 inline function, as we might never be compiled separately. */
6305 && DECL_INLINE (fndecl))
6306 warning ("no return statement in function returning non-void");
6308 /* With just -Wextra, complain only if function returns both with
6309 and without a value. */
6311 && current_function_returns_value
6312 && current_function_returns_null)
6313 warning ("this function may return with or without a value");
6315 /* Store the end of the function, so that we get good line number
6316 info for the epilogue. */
6317 cfun->function_end_locus = input_location;
6319 /* If we don't have ctors/dtors sections, and this is a static
6320 constructor or destructor, it must be recorded now. */
6321 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6322 && !targetm.have_ctors_dtors)
6323 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6324 if (DECL_STATIC_DESTRUCTOR (fndecl)
6325 && !targetm.have_ctors_dtors)
6326 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6328 /* Finalize the ELF visibility for the function. */
6329 c_determine_visibility (fndecl);
6331 /* Genericize before inlining. Delay genericizing nested functions
6332 until their parent function is genericized. Since finalizing
6333 requires GENERIC, delay that as well. */
6335 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6336 && !undef_nested_function)
6338 if (!decl_function_context (fndecl))
6340 c_genericize (fndecl);
6341 c_warn_unused_result_recursively (fndecl);
6343 /* ??? Objc emits functions after finalizing the compilation unit.
6344 This should be cleaned up later and this conditional removed. */
6345 if (cgraph_global_info_ready)
6347 c_expand_body (fndecl);
6351 cgraph_finalize_function (fndecl, false);
6355 /* Register this function with cgraph just far enough to get it
6356 added to our parent's nested function list. Handy, since the
6357 C front end doesn't have such a list. */
6358 (void) cgraph_node (fndecl);
6362 if (!decl_function_context (fndecl))
6363 undef_nested_function = false;
6365 /* We're leaving the context of this function, so zap cfun.
6366 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6367 tree_rest_of_compilation. */
6369 current_function_decl = NULL;
6372 /* Generate the RTL for the body of FNDECL. */
6375 c_expand_body (tree fndecl)
6378 if (!DECL_INITIAL (fndecl)
6379 || DECL_INITIAL (fndecl) == error_mark_node)
6382 tree_rest_of_compilation (fndecl);
6384 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6385 && targetm.have_ctors_dtors)
6386 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6387 DEFAULT_INIT_PRIORITY);
6388 if (DECL_STATIC_DESTRUCTOR (fndecl)
6389 && targetm.have_ctors_dtors)
6390 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6391 DEFAULT_INIT_PRIORITY);
6394 /* Check the declarations given in a for-loop for satisfying the C99
6397 check_for_loop_decls (void)
6399 struct c_binding *b;
6403 /* If we get here, declarations have been used in a for loop without
6404 the C99 for loop scope. This doesn't make much sense, so don't
6406 error ("%<for%> loop initial declaration used outside C99 mode");
6409 /* C99 subclause 6.8.5 paragraph 3:
6411 [#3] The declaration part of a for statement shall only
6412 declare identifiers for objects having storage class auto or
6415 It isn't clear whether, in this sentence, "identifiers" binds to
6416 "shall only declare" or to "objects" - that is, whether all identifiers
6417 declared must be identifiers for objects, or whether the restriction
6418 only applies to those that are. (A question on this in comp.std.c
6419 in November 2000 received no answer.) We implement the strictest
6420 interpretation, to avoid creating an extension which later causes
6423 for (b = current_scope->bindings; b; b = b->prev)
6426 tree decl = b->decl;
6431 switch (TREE_CODE (decl))
6434 if (TREE_STATIC (decl))
6435 error ("%Jdeclaration of static variable %qD in %<for%> loop "
6436 "initial declaration", decl, decl);
6437 else if (DECL_EXTERNAL (decl))
6438 error ("%Jdeclaration of %<extern%> variable %qD in %<for%> loop "
6439 "initial declaration", decl, decl);
6443 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6447 error ("%<union %E%> declared in %<for%> loop initial declaration",
6451 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6455 error ("%Jdeclaration of non-variable %qD in %<for%> loop "
6456 "initial declaration", decl, decl);
6461 /* Save and reinitialize the variables
6462 used during compilation of a C function. */
6465 c_push_function_context (struct function *f)
6467 struct language_function *p;
6468 p = GGC_NEW (struct language_function);
6471 p->base.x_stmt_tree = c_stmt_tree;
6472 p->x_break_label = c_break_label;
6473 p->x_cont_label = c_cont_label;
6474 p->x_switch_stack = c_switch_stack;
6475 p->arg_info = current_function_arg_info;
6476 p->returns_value = current_function_returns_value;
6477 p->returns_null = current_function_returns_null;
6478 p->returns_abnormally = current_function_returns_abnormally;
6479 p->warn_about_return_type = warn_about_return_type;
6480 p->extern_inline = current_extern_inline;
6483 /* Restore the variables used during compilation of a C function. */
6486 c_pop_function_context (struct function *f)
6488 struct language_function *p = f->language;
6490 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6491 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6493 /* Stop pointing to the local nodes about to be freed. */
6494 /* But DECL_INITIAL must remain nonzero so we know this
6495 was an actual function definition. */
6496 DECL_INITIAL (current_function_decl) = error_mark_node;
6497 DECL_ARGUMENTS (current_function_decl) = 0;
6500 c_stmt_tree = p->base.x_stmt_tree;
6501 c_break_label = p->x_break_label;
6502 c_cont_label = p->x_cont_label;
6503 c_switch_stack = p->x_switch_stack;
6504 current_function_arg_info = p->arg_info;
6505 current_function_returns_value = p->returns_value;
6506 current_function_returns_null = p->returns_null;
6507 current_function_returns_abnormally = p->returns_abnormally;
6508 warn_about_return_type = p->warn_about_return_type;
6509 current_extern_inline = p->extern_inline;
6514 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6517 c_dup_lang_specific_decl (tree decl)
6519 struct lang_decl *ld;
6521 if (!DECL_LANG_SPECIFIC (decl))
6524 ld = GGC_NEW (struct lang_decl);
6525 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6526 DECL_LANG_SPECIFIC (decl) = ld;
6529 /* The functions below are required for functionality of doing
6530 function at once processing in the C front end. Currently these
6531 functions are not called from anywhere in the C front end, but as
6532 these changes continue, that will change. */
6534 /* Returns nonzero if the current statement is a full expression,
6535 i.e. temporaries created during that statement should be destroyed
6536 at the end of the statement. */
6539 stmts_are_full_exprs_p (void)
6544 /* Returns the stmt_tree (if any) to which statements are currently
6545 being added. If there is no active statement-tree, NULL is
6549 current_stmt_tree (void)
6551 return &c_stmt_tree;
6554 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6558 anon_aggr_type_p (tree ARG_UNUSED (node))
6563 /* Return the global value of T as a symbol. */
6566 identifier_global_value (tree t)
6568 struct c_binding *b;
6570 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6571 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6577 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6578 otherwise the name is found in ridpointers from RID_INDEX. */
6581 record_builtin_type (enum rid rid_index, const char *name, tree type)
6585 id = ridpointers[(int) rid_index];
6587 id = get_identifier (name);
6588 decl = build_decl (TYPE_DECL, id, type);
6590 if (debug_hooks->type_decl)
6591 debug_hooks->type_decl (decl, false);
6594 /* Build the void_list_node (void_type_node having been created). */
6596 build_void_list_node (void)
6598 tree t = build_tree_list (NULL_TREE, void_type_node);
6602 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6605 build_c_parm (struct c_declspecs *specs, tree attrs,
6606 struct c_declarator *declarator)
6608 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6611 ret->declarator = declarator;
6615 /* Return a declarator with nested attributes. TARGET is the inner
6616 declarator to which these attributes apply. ATTRS are the
6619 struct c_declarator *
6620 build_attrs_declarator (tree attrs, struct c_declarator *target)
6622 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6623 ret->kind = cdk_attrs;
6624 ret->declarator = target;
6625 ret->u.attrs = attrs;
6629 /* Return a declarator for a function with arguments specified by ARGS
6630 and return type specified by TARGET. */
6632 struct c_declarator *
6633 build_function_declarator (struct c_arg_info *args,
6634 struct c_declarator *target)
6636 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6637 ret->kind = cdk_function;
6638 ret->declarator = target;
6639 ret->u.arg_info = args;
6643 /* Return a declarator for the identifier IDENT (which may be
6644 NULL_TREE for an abstract declarator). */
6646 struct c_declarator *
6647 build_id_declarator (tree ident)
6649 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6651 ret->declarator = 0;
6653 /* Default value - may get reset to a more precise location. */
6654 ret->id_loc = input_location;
6658 /* Return something to represent absolute declarators containing a *.
6659 TARGET is the absolute declarator that the * contains.
6660 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6661 to apply to the pointer type. */
6663 struct c_declarator *
6664 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6665 struct c_declarator *target)
6669 struct c_declarator *itarget = target;
6670 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6671 if (type_quals_attrs)
6673 attrs = type_quals_attrs->attrs;
6674 quals = quals_from_declspecs (type_quals_attrs);
6675 if (attrs != NULL_TREE)
6676 itarget = build_attrs_declarator (attrs, target);
6678 ret->kind = cdk_pointer;
6679 ret->declarator = itarget;
6680 ret->u.pointer_quals = quals;
6684 /* Return a pointer to a structure for an empty list of declaration
6687 struct c_declspecs *
6688 build_null_declspecs (void)
6690 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6694 ret->typespec_word = cts_none;
6695 ret->storage_class = csc_none;
6696 ret->declspecs_seen_p = false;
6697 ret->type_seen_p = false;
6698 ret->non_sc_seen_p = false;
6699 ret->typedef_p = false;
6700 ret->tag_defined_p = false;
6701 ret->explicit_signed_p = false;
6702 ret->deprecated_p = false;
6703 ret->default_int_p = false;
6704 ret->long_p = false;
6705 ret->long_long_p = false;
6706 ret->short_p = false;
6707 ret->signed_p = false;
6708 ret->unsigned_p = false;
6709 ret->complex_p = false;
6710 ret->inline_p = false;
6711 ret->thread_p = false;
6712 ret->const_p = false;
6713 ret->volatile_p = false;
6714 ret->restrict_p = false;
6718 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6721 struct c_declspecs *
6722 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6726 specs->non_sc_seen_p = true;
6727 specs->declspecs_seen_p = true;
6728 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6729 && C_IS_RESERVED_WORD (qual));
6730 i = C_RID_CODE (qual);
6734 dupe = specs->const_p;
6735 specs->const_p = true;
6738 dupe = specs->volatile_p;
6739 specs->volatile_p = true;
6742 dupe = specs->restrict_p;
6743 specs->restrict_p = true;
6748 if (dupe && pedantic && !flag_isoc99)
6749 pedwarn ("duplicate %qE", qual);
6753 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6756 struct c_declspecs *
6757 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
6759 tree type = spec.spec;
6760 specs->non_sc_seen_p = true;
6761 specs->declspecs_seen_p = true;
6762 specs->type_seen_p = true;
6763 if (TREE_DEPRECATED (type))
6764 specs->deprecated_p = true;
6766 /* Handle type specifier keywords. */
6767 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
6769 enum rid i = C_RID_CODE (type);
6772 error ("two or more data types in declaration specifiers");
6775 if ((int) i <= (int) RID_LAST_MODIFIER)
6777 /* "long", "short", "signed", "unsigned" or "_Complex". */
6782 if (specs->long_long_p)
6784 error ("%<long long long%> is too long for GCC");
6789 if (specs->typespec_word == cts_double)
6791 error ("both %<long long%> and %<double%> in "
6792 "declaration specifiers");
6795 if (pedantic && !flag_isoc99 && !in_system_header
6797 pedwarn ("ISO C90 does not support %<long long%>");
6798 specs->long_long_p = 1;
6802 error ("both %<long%> and %<short%> in "
6803 "declaration specifiers");
6804 else if (specs->typespec_word == cts_void)
6805 error ("both %<long%> and %<void%> in "
6806 "declaration specifiers");
6807 else if (specs->typespec_word == cts_bool)
6808 error ("both %<long%> and %<_Bool%> in "
6809 "declaration specifiers");
6810 else if (specs->typespec_word == cts_char)
6811 error ("both %<long%> and %<char%> in "
6812 "declaration specifiers");
6813 else if (specs->typespec_word == cts_float)
6814 error ("both %<long%> and %<float%> in "
6815 "declaration specifiers");
6817 specs->long_p = true;
6820 dupe = specs->short_p;
6822 error ("both %<long%> and %<short%> in "
6823 "declaration specifiers");
6824 else if (specs->typespec_word == cts_void)
6825 error ("both %<short%> and %<void%> in "
6826 "declaration specifiers");
6827 else if (specs->typespec_word == cts_bool)
6828 error ("both %<short%> and %<_Bool%> in "
6829 "declaration specifiers");
6830 else if (specs->typespec_word == cts_char)
6831 error ("both %<short%> and %<char%> in "
6832 "declaration specifiers");
6833 else if (specs->typespec_word == cts_float)
6834 error ("both %<short%> and %<float%> in "
6835 "declaration specifiers");
6836 else if (specs->typespec_word == cts_double)
6837 error ("both %<short%> and %<double%> in "
6838 "declaration specifiers");
6840 specs->short_p = true;
6843 dupe = specs->signed_p;
6844 if (specs->unsigned_p)
6845 error ("both %<signed%> and %<unsigned%> in "
6846 "declaration specifiers");
6847 else if (specs->typespec_word == cts_void)
6848 error ("both %<signed%> and %<void%> in "
6849 "declaration specifiers");
6850 else if (specs->typespec_word == cts_bool)
6851 error ("both %<signed%> and %<_Bool%> in "
6852 "declaration specifiers");
6853 else if (specs->typespec_word == cts_float)
6854 error ("both %<signed%> and %<float%> in "
6855 "declaration specifiers");
6856 else if (specs->typespec_word == cts_double)
6857 error ("both %<signed%> and %<double%> in "
6858 "declaration specifiers");
6860 specs->signed_p = true;
6863 dupe = specs->unsigned_p;
6864 if (specs->signed_p)
6865 error ("both %<signed%> and %<unsigned%> in "
6866 "declaration specifiers");
6867 else if (specs->typespec_word == cts_void)
6868 error ("both %<unsigned%> and %<void%> in "
6869 "declaration specifiers");
6870 else if (specs->typespec_word == cts_bool)
6871 error ("both %<unsigned%> and %<_Bool%> in "
6872 "declaration specifiers");
6873 else if (specs->typespec_word == cts_float)
6874 error ("both %<unsigned%> and %<float%> in "
6875 "declaration specifiers");
6876 else if (specs->typespec_word == cts_double)
6877 error ("both %<unsigned%> and %<double%> in "
6878 "declaration specifiers");
6880 specs->unsigned_p = true;
6883 dupe = specs->complex_p;
6884 if (pedantic && !flag_isoc99 && !in_system_header)
6885 pedwarn ("ISO C90 does not support complex types");
6886 if (specs->typespec_word == cts_void)
6887 error ("both %<complex%> and %<void%> in "
6888 "declaration specifiers");
6889 else if (specs->typespec_word == cts_bool)
6890 error ("both %<complex%> and %<_Bool%> in "
6891 "declaration specifiers");
6893 specs->complex_p = true;
6900 error ("duplicate %qE", type);
6906 /* "void", "_Bool", "char", "int", "float" or "double". */
6907 if (specs->typespec_word != cts_none)
6909 error ("two or more data types in declaration specifiers");
6916 error ("both %<long%> and %<void%> in "
6917 "declaration specifiers");
6918 else if (specs->short_p)
6919 error ("both %<short%> and %<void%> in "
6920 "declaration specifiers");
6921 else if (specs->signed_p)
6922 error ("both %<signed%> and %<void%> in "
6923 "declaration specifiers");
6924 else if (specs->unsigned_p)
6925 error ("both %<unsigned%> and %<void%> in "
6926 "declaration specifiers");
6927 else if (specs->complex_p)
6928 error ("both %<complex%> and %<void%> in "
6929 "declaration specifiers");
6931 specs->typespec_word = cts_void;
6935 error ("both %<long%> and %<_Bool%> in "
6936 "declaration specifiers");
6937 else if (specs->short_p)
6938 error ("both %<short%> and %<_Bool%> in "
6939 "declaration specifiers");
6940 else if (specs->signed_p)
6941 error ("both %<signed%> and %<_Bool%> in "
6942 "declaration specifiers");
6943 else if (specs->unsigned_p)
6944 error ("both %<unsigned%> and %<_Bool%> in "
6945 "declaration specifiers");
6946 else if (specs->complex_p)
6947 error ("both %<complex%> and %<_Bool%> in "
6948 "declaration specifiers");
6950 specs->typespec_word = cts_bool;
6954 error ("both %<long%> and %<char%> in "
6955 "declaration specifiers");
6956 else if (specs->short_p)
6957 error ("both %<short%> and %<char%> in "
6958 "declaration specifiers");
6960 specs->typespec_word = cts_char;
6963 specs->typespec_word = cts_int;
6967 error ("both %<long%> and %<float%> in "
6968 "declaration specifiers");
6969 else if (specs->short_p)
6970 error ("both %<short%> and %<float%> in "
6971 "declaration specifiers");
6972 else if (specs->signed_p)
6973 error ("both %<signed%> and %<float%> in "
6974 "declaration specifiers");
6975 else if (specs->unsigned_p)
6976 error ("both %<unsigned%> and %<float%> in "
6977 "declaration specifiers");
6979 specs->typespec_word = cts_float;
6982 if (specs->long_long_p)
6983 error ("both %<long long%> and %<double%> in "
6984 "declaration specifiers");
6985 else if (specs->short_p)
6986 error ("both %<short%> and %<double%> in "
6987 "declaration specifiers");
6988 else if (specs->signed_p)
6989 error ("both %<signed%> and %<double%> in "
6990 "declaration specifiers");
6991 else if (specs->unsigned_p)
6992 error ("both %<unsigned%> and %<double%> in "
6993 "declaration specifiers");
6995 specs->typespec_word = cts_double;
6998 /* ObjC reserved word "id", handled below. */
7004 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7005 form of ObjC type, cases such as "int" and "long" being handled
7006 above), a TYPE (struct, union, enum and typeof specifiers) or an
7007 ERROR_MARK. In none of these cases may there have previously
7008 been any type specifiers. */
7009 if (specs->type || specs->typespec_word != cts_none
7010 || specs->long_p || specs->short_p || specs->signed_p
7011 || specs->unsigned_p || specs->complex_p)
7012 error ("two or more data types in declaration specifiers");
7013 else if (TREE_CODE (type) == TYPE_DECL)
7015 if (TREE_TYPE (type) == error_mark_node)
7016 ; /* Allow the type to default to int to avoid cascading errors. */
7019 specs->type = TREE_TYPE (type);
7020 specs->decl_attr = DECL_ATTRIBUTES (type);
7021 specs->typedef_p = true;
7022 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7025 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7027 tree t = lookup_name (type);
7028 if (!t || TREE_CODE (t) != TYPE_DECL)
7029 error ("%qE fails to be a typedef or built in type", type);
7030 else if (TREE_TYPE (t) == error_mark_node)
7033 specs->type = TREE_TYPE (t);
7035 else if (TREE_CODE (type) != ERROR_MARK)
7037 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7038 specs->tag_defined_p = true;
7039 if (spec.kind == ctsk_typeof)
7040 specs->typedef_p = true;
7047 /* Add the storage class specifier or function specifier SCSPEC to the
7048 declaration specifiers SPECS, returning SPECS. */
7050 struct c_declspecs *
7051 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7054 enum c_storage_class n = csc_none;
7056 specs->declspecs_seen_p = true;
7057 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7058 && C_IS_RESERVED_WORD (scspec));
7059 i = C_RID_CODE (scspec);
7060 if (extra_warnings && specs->non_sc_seen_p)
7061 warning ("%qE is not at beginning of declaration", scspec);
7065 /* C99 permits duplicate inline. Although of doubtful utility,
7066 it seems simplest to permit it in gnu89 mode as well, as
7067 there is also little utility in maintaining this as a
7068 difference between gnu89 and C99 inline. */
7070 specs->inline_p = true;
7073 dupe = specs->thread_p;
7074 if (specs->storage_class == csc_auto)
7075 error ("%<__thread%> used with %<auto%>");
7076 else if (specs->storage_class == csc_register)
7077 error ("%<__thread%> used with %<register%>");
7078 else if (specs->storage_class == csc_typedef)
7079 error ("%<__thread%> used with %<typedef%>");
7081 specs->thread_p = true;
7088 /* Diagnose "__thread extern". */
7089 if (specs->thread_p)
7090 error ("%<__thread%> before %<extern%>");
7097 /* Diagnose "__thread static". */
7098 if (specs->thread_p)
7099 error ("%<__thread%> before %<static%>");
7107 if (n != csc_none && n == specs->storage_class)
7110 error ("duplicate %qE", scspec);
7113 if (specs->storage_class != csc_none && n != specs->storage_class)
7115 error ("multiple storage classes in declaration specifiers");
7119 specs->storage_class = n;
7120 if (n != csc_extern && n != csc_static && specs->thread_p)
7122 error ("%<__thread%> used with %qE", scspec);
7123 specs->thread_p = false;
7130 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7133 struct c_declspecs *
7134 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7136 specs->attrs = chainon (attrs, specs->attrs);
7137 specs->declspecs_seen_p = true;
7141 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7142 specifiers with any other type specifier to determine the resulting
7143 type. This is where ISO C checks on complex types are made, since
7144 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7147 struct c_declspecs *
7148 finish_declspecs (struct c_declspecs *specs)
7150 /* If a type was specified as a whole, we have no modifiers and are
7152 if (specs->type != NULL_TREE)
7154 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7155 && !specs->signed_p && !specs->unsigned_p
7156 && !specs->complex_p);
7160 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7161 has been specified, treat it as "int" unless "_Complex" is
7162 present and there are no other specifiers. If we just have
7163 "_Complex", it is equivalent to "_Complex double", but e.g.
7164 "_Complex short" is equivalent to "_Complex short int". */
7165 if (specs->typespec_word == cts_none)
7167 if (specs->long_p || specs->short_p
7168 || specs->signed_p || specs->unsigned_p)
7170 specs->typespec_word = cts_int;
7172 else if (specs->complex_p)
7174 specs->typespec_word = cts_double;
7176 pedwarn ("ISO C does not support plain %<complex%> meaning "
7177 "%<double complex%>");
7181 specs->typespec_word = cts_int;
7182 specs->default_int_p = true;
7183 /* We don't diagnose this here because grokdeclarator will
7184 give more specific diagnostics according to whether it is
7185 a function definition. */
7189 /* If "signed" was specified, record this to distinguish "int" and
7190 "signed int" in the case of a bit-field with
7191 -funsigned-bitfields. */
7192 specs->explicit_signed_p = specs->signed_p;
7194 /* Now compute the actual type. */
7195 switch (specs->typespec_word)
7198 gcc_assert (!specs->long_p && !specs->short_p
7199 && !specs->signed_p && !specs->unsigned_p
7200 && !specs->complex_p);
7201 specs->type = void_type_node;
7204 gcc_assert (!specs->long_p && !specs->short_p
7205 && !specs->signed_p && !specs->unsigned_p
7206 && !specs->complex_p);
7207 specs->type = boolean_type_node;
7210 gcc_assert (!specs->long_p && !specs->short_p);
7211 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7212 if (specs->signed_p)
7213 specs->type = signed_char_type_node;
7214 else if (specs->unsigned_p)
7215 specs->type = unsigned_char_type_node;
7217 specs->type = char_type_node;
7218 if (specs->complex_p)
7221 pedwarn ("ISO C does not support complex integer types");
7222 specs->type = build_complex_type (specs->type);
7226 gcc_assert (!(specs->long_p && specs->short_p));
7227 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7228 if (specs->long_long_p)
7229 specs->type = (specs->unsigned_p
7230 ? long_long_unsigned_type_node
7231 : long_long_integer_type_node);
7232 else if (specs->long_p)
7233 specs->type = (specs->unsigned_p
7234 ? long_unsigned_type_node
7235 : long_integer_type_node);
7236 else if (specs->short_p)
7237 specs->type = (specs->unsigned_p
7238 ? short_unsigned_type_node
7239 : short_integer_type_node);
7241 specs->type = (specs->unsigned_p
7242 ? unsigned_type_node
7243 : integer_type_node);
7244 if (specs->complex_p)
7247 pedwarn ("ISO C does not support complex integer types");
7248 specs->type = build_complex_type (specs->type);
7252 gcc_assert (!specs->long_p && !specs->short_p
7253 && !specs->signed_p && !specs->unsigned_p);
7254 specs->type = (specs->complex_p
7255 ? complex_float_type_node
7259 gcc_assert (!specs->long_long_p && !specs->short_p
7260 && !specs->signed_p && !specs->unsigned_p);
7263 specs->type = (specs->complex_p
7264 ? complex_long_double_type_node
7265 : long_double_type_node);
7269 specs->type = (specs->complex_p
7270 ? complex_double_type_node
7271 : double_type_node);
7281 /* Synthesize a function which calls all the global ctors or global
7282 dtors in this file. This is only used for targets which do not
7283 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7285 build_cdtor (int method_type, tree cdtors)
7292 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7293 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7296 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7299 /* Perform final processing on one file scope's declarations (or the
7300 external scope's declarations), GLOBALS. */
7302 c_write_global_declarations_1 (tree globals)
7304 size_t len = list_length (globals);
7305 tree *vec = XNEWVEC (tree, len);
7309 /* Process the decls in the order they were written. */
7310 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
7313 /* Check for used but undefined static functions using the C
7314 standard's definition of "used", and set TREE_NO_WARNING so
7315 that check_global_declarations doesn't repeat the check. */
7316 if (TREE_CODE (decl) == FUNCTION_DECL
7317 && DECL_INITIAL (decl) == 0
7318 && DECL_EXTERNAL (decl)
7319 && !TREE_PUBLIC (decl)
7320 && C_DECL_USED (decl))
7322 pedwarn ("%J%qF used but never defined", decl, decl);
7323 TREE_NO_WARNING (decl) = 1;
7327 wrapup_global_declarations (vec, len);
7328 check_global_declarations (vec, len);
7334 c_write_global_declarations (void)
7338 /* We don't want to do this if generating a PCH. */
7342 /* Don't waste time on further processing if -fsyntax-only or we've
7343 encountered errors. */
7344 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7347 /* Close the external scope. */
7348 ext_block = pop_scope ();
7350 gcc_assert (!current_scope);
7352 /* Process all file scopes in this compilation, and the external_scope,
7353 through wrapup_global_declarations and check_global_declarations. */
7354 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7355 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7356 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7358 /* Generate functions to call static constructors and destructors
7359 for targets that do not support .ctors/.dtors sections. These
7360 functions have magic names which are detected by collect2. */
7361 build_cdtor ('I', static_ctors); static_ctors = 0;
7362 build_cdtor ('D', static_dtors); static_dtors = 0;
7364 /* We're done parsing; proceed to optimize and emit assembly.
7365 FIXME: shouldn't be the front end's responsibility to call this. */
7369 #include "gt-c-decl.h"