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, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
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"
56 #include "tree-iterator.h"
57 #include "diagnostic.h"
58 #include "tree-dump.h"
63 #include "langhooks-def.h"
64 #include "pointer-set.h"
68 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
70 { NORMAL, /* Ordinary declaration */
71 FUNCDEF, /* Function definition */
72 PARM, /* Declaration of parm before function body */
73 FIELD, /* Declaration inside struct or union */
74 TYPENAME}; /* Typename (inside cast or sizeof) */
76 /* States indicating how grokdeclarator() should handle declspecs marked
77 with __attribute__((deprecated)). An object declared as
78 __attribute__((deprecated)) suppresses warnings of uses of other
81 enum deprecated_states {
87 /* Nonzero if we have seen an invalid cross reference
88 to a struct, union, or enum, but not yet printed the message. */
89 tree pending_invalid_xref;
91 /* File and line to appear in the eventual error message. */
92 location_t pending_invalid_xref_location;
94 /* True means we've initialized exception handling. */
95 bool c_eh_initialized_p;
97 /* The file and line that the prototype came from if this is an
98 old-style definition; used for diagnostics in
99 store_parm_decls_oldstyle. */
101 static location_t current_function_prototype_locus;
103 /* Whether this prototype was built-in. */
105 static bool current_function_prototype_built_in;
107 /* The argument type information of this prototype. */
109 static tree current_function_prototype_arg_types;
111 /* The argument information structure for the function currently being
114 static struct c_arg_info *current_function_arg_info;
116 /* The obstack on which parser and related data structures, which are
117 not live beyond their top-level declaration or definition, are
119 struct obstack parser_obstack;
121 /* The current statement tree. */
123 static GTY(()) struct stmt_tree_s c_stmt_tree;
125 /* State saving variables. */
129 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
130 included in this invocation. Note that the current translation
131 unit is not included in this list. */
133 static GTY(()) tree all_translation_units;
135 /* A list of decls to be made automatically visible in each file scope. */
136 static GTY(()) tree visible_builtins;
138 /* Set to 0 at beginning of a function definition, set to 1 if
139 a return statement that specifies a return value is seen. */
141 int current_function_returns_value;
143 /* Set to 0 at beginning of a function definition, set to 1 if
144 a return statement with no argument is seen. */
146 int current_function_returns_null;
148 /* Set to 0 at beginning of a function definition, set to 1 if
149 a call to a noreturn function is seen. */
151 int current_function_returns_abnormally;
153 /* Set to nonzero by `grokdeclarator' for a function
154 whose return type is defaulted, if warnings for this are desired. */
156 static int warn_about_return_type;
158 /* Nonzero when the current toplevel function contains a declaration
159 of a nested function which is never defined. */
161 static bool undef_nested_function;
163 /* True means global_bindings_p should return false even if the scope stack
164 says we are in file scope. */
165 bool c_override_global_bindings_to_false;
168 /* Each c_binding structure describes one binding of an identifier to
169 a decl. All the decls in a scope - irrespective of namespace - are
170 chained together by the ->prev field, which (as the name implies)
171 runs in reverse order. All the decls in a given namespace bound to
172 a given identifier are chained by the ->shadowed field, which runs
173 from inner to outer scopes.
175 The ->decl field usually points to a DECL node, but there are two
176 exceptions. In the namespace of type tags, the bound entity is a
177 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
178 identifier is encountered, it is bound to error_mark_node to
179 suppress further errors about that identifier in the current
182 The ->type field stores the type of the declaration in this scope;
183 if NULL, the type is the type of the ->decl field. This is only of
184 relevance for objects with external or internal linkage which may
185 be redeclared in inner scopes, forming composite types that only
186 persist for the duration of those scopes. In the external scope,
187 this stores the composite of all the types declared for this
188 object, visible or not. The ->inner_comp field (used only at file
189 scope) stores whether an incomplete array type at file scope was
190 completed at an inner scope to an array size other than 1.
192 The depth field is copied from the scope structure that holds this
193 decl. It is used to preserve the proper ordering of the ->shadowed
194 field (see bind()) and also for a handful of special-case checks.
195 Finally, the invisible bit is true for a decl which should be
196 ignored for purposes of normal name lookup, and the nested bit is
197 true for a decl that's been bound a second time in an inner scope;
198 in all such cases, the binding in the outer scope will have its
199 invisible bit true. */
201 struct c_binding GTY((chain_next ("%h.prev")))
203 tree decl; /* the decl bound */
204 tree type; /* the type in this scope */
205 tree id; /* the identifier it's bound to */
206 struct c_binding *prev; /* the previous decl in this scope */
207 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
208 unsigned int depth : 28; /* depth of this scope */
209 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
210 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
211 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
213 location_t locus; /* location for nested bindings */
215 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
216 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
217 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
218 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
220 #define I_SYMBOL_BINDING(node) \
221 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
222 #define I_SYMBOL_DECL(node) \
223 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
225 #define I_TAG_BINDING(node) \
226 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
227 #define I_TAG_DECL(node) \
228 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
230 #define I_LABEL_BINDING(node) \
231 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
232 #define I_LABEL_DECL(node) \
233 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
235 /* Each C symbol points to three linked lists of c_binding structures.
236 These describe the values of the identifier in the three different
237 namespaces defined by the language. */
239 struct lang_identifier GTY(())
241 struct c_common_identifier common_id;
242 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
243 struct c_binding *tag_binding; /* struct/union/enum tags */
244 struct c_binding *label_binding; /* labels */
247 /* Validate c-lang.c's assumptions. */
248 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
249 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
251 /* The resulting tree type. */
254 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
255 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))")))
257 union tree_node GTY ((tag ("0"),
258 desc ("tree_node_structure (&%h)")))
260 struct lang_identifier GTY ((tag ("1"))) identifier;
263 /* Each c_scope structure describes the complete contents of one
264 scope. Four scopes are distinguished specially: the innermost or
265 current scope, the innermost function scope, the file scope (always
266 the second to outermost) and the outermost or external scope.
268 Most declarations are recorded in the current scope.
270 All normal label declarations are recorded in the innermost
271 function scope, as are bindings of undeclared identifiers to
272 error_mark_node. (GCC permits nested functions as an extension,
273 hence the 'innermost' qualifier.) Explicitly declared labels
274 (using the __label__ extension) appear in the current scope.
276 Being in the file scope (current_scope == file_scope) causes
277 special behavior in several places below. Also, under some
278 conditions the Objective-C front end records declarations in the
279 file scope even though that isn't the current scope.
281 All declarations with external linkage are recorded in the external
282 scope, even if they aren't visible there; this models the fact that
283 such declarations are visible to the entire program, and (with a
284 bit of cleverness, see pushdecl) allows diagnosis of some violations
285 of C99 6.2.2p7 and 6.2.7p2:
287 If, within the same translation unit, the same identifier appears
288 with both internal and external linkage, the behavior is
291 All declarations that refer to the same object or function shall
292 have compatible type; otherwise, the behavior is undefined.
294 Initially only the built-in declarations, which describe compiler
295 intrinsic functions plus a subset of the standard library, are in
298 The order of the blocks list matters, and it is frequently appended
299 to. To avoid having to walk all the way to the end of the list on
300 each insertion, or reverse the list later, we maintain a pointer to
301 the last list entry. (FIXME: It should be feasible to use a reversed
304 The bindings list is strictly in reverse order of declarations;
305 pop_scope relies on this. */
308 struct c_scope GTY((chain_next ("%h.outer")))
310 /* The scope containing this one. */
311 struct c_scope *outer;
313 /* The next outermost function scope. */
314 struct c_scope *outer_function;
316 /* All bindings in this scope. */
317 struct c_binding *bindings;
319 /* For each scope (except the global one), a chain of BLOCK nodes
320 for all the scopes that were entered and exited one level down. */
324 /* The depth of this scope. Used to keep the ->shadowed chain of
325 bindings sorted innermost to outermost. */
326 unsigned int depth : 28;
328 /* True if we are currently filling this scope with parameter
330 BOOL_BITFIELD parm_flag : 1;
332 /* True if we saw [*] in this scope. Used to give an error messages
333 if these appears in a function definition. */
334 BOOL_BITFIELD had_vla_unspec : 1;
336 /* True if we already complained about forward parameter decls
337 in this scope. This prevents double warnings on
338 foo (int a; int b; ...) */
339 BOOL_BITFIELD warned_forward_parm_decls : 1;
341 /* True if this is the outermost block scope of a function body.
342 This scope contains the parameters, the local variables declared
343 in the outermost block, and all the labels (except those in
344 nested functions, or declared at block scope with __label__). */
345 BOOL_BITFIELD function_body : 1;
347 /* True means make a BLOCK for this scope no matter what. */
348 BOOL_BITFIELD keep : 1;
351 /* The scope currently in effect. */
353 static GTY(()) struct c_scope *current_scope;
355 /* The innermost function scope. Ordinary (not explicitly declared)
356 labels, bindings to error_mark_node, and the lazily-created
357 bindings of __func__ and its friends get this scope. */
359 static GTY(()) struct c_scope *current_function_scope;
361 /* The C file scope. This is reset for each input translation unit. */
363 static GTY(()) struct c_scope *file_scope;
365 /* The outermost scope. This is used for all declarations with
366 external linkage, and only these, hence the name. */
368 static GTY(()) struct c_scope *external_scope;
370 /* A chain of c_scope structures awaiting reuse. */
372 static GTY((deletable)) struct c_scope *scope_freelist;
374 /* A chain of c_binding structures awaiting reuse. */
376 static GTY((deletable)) struct c_binding *binding_freelist;
378 /* Append VAR to LIST in scope SCOPE. */
379 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
380 struct c_scope *s_ = (scope); \
382 if (s_->list##_last) \
383 BLOCK_CHAIN (s_->list##_last) = d_; \
386 s_->list##_last = d_; \
389 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
390 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
391 struct c_scope *t_ = (tscope); \
392 struct c_scope *f_ = (fscope); \
394 BLOCK_CHAIN (t_->to##_last) = f_->from; \
397 t_->to##_last = f_->from##_last; \
400 /* True means unconditionally make a BLOCK for the next scope pushed. */
402 static bool keep_next_level_flag;
404 /* True means the next call to push_scope will be the outermost scope
405 of a function body, so do not push a new scope, merely cease
406 expecting parameter decls. */
408 static bool next_is_function_body;
410 /* Forward declarations. */
411 static tree lookup_name_in_scope (tree, struct c_scope *);
412 static tree c_make_fname_decl (tree, int);
413 static tree grokdeclarator (const struct c_declarator *,
414 struct c_declspecs *,
415 enum decl_context, bool, tree *, tree *, tree *,
416 bool *, enum deprecated_states);
417 static tree grokparms (struct c_arg_info *, bool);
418 static void layout_array_type (tree);
420 /* T is a statement. Add it to the statement-tree. This is the
421 C/ObjC version--C++ has a slightly different version of this
427 enum tree_code code = TREE_CODE (t);
429 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
431 if (!EXPR_HAS_LOCATION (t))
432 SET_EXPR_LOCATION (t, input_location);
435 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
436 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
438 /* Add T to the statement-tree. Non-side-effect statements need to be
439 recorded during statement expressions. */
440 append_to_statement_list_force (t, &cur_stmt_list);
447 c_print_identifier (FILE *file, tree node, int indent)
449 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
450 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
451 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
452 if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
454 tree rid = ridpointers[C_RID_CODE (node)];
455 indent_to (file, indent + 4);
456 fprintf (file, "rid %p \"%s\"",
457 (void *) rid, IDENTIFIER_POINTER (rid));
461 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
462 which may be any of several kinds of DECL or TYPE or error_mark_node,
463 in the scope SCOPE. */
465 bind (tree name, tree decl, struct c_scope *scope, bool invisible,
466 bool nested, location_t locus)
468 struct c_binding *b, **here;
470 if (binding_freelist)
472 b = binding_freelist;
473 binding_freelist = b->prev;
476 b = GGC_NEW (struct c_binding);
481 b->depth = scope->depth;
482 b->invisible = invisible;
489 b->prev = scope->bindings;
495 switch (TREE_CODE (decl))
497 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
500 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
506 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
512 /* Locate the appropriate place in the chain of shadowed decls
513 to insert this binding. Normally, scope == current_scope and
514 this does nothing. */
515 while (*here && (*here)->depth > scope->depth)
516 here = &(*here)->shadowed;
522 /* Clear the binding structure B, stick it on the binding_freelist,
523 and return the former value of b->prev. This is used by pop_scope
524 and get_parm_info to iterate destructively over all the bindings
525 from a given scope. */
526 static struct c_binding *
527 free_binding_and_advance (struct c_binding *b)
529 struct c_binding *prev = b->prev;
531 memset (b, 0, sizeof (struct c_binding));
532 b->prev = binding_freelist;
533 binding_freelist = b;
539 /* Hook called at end of compilation to assume 1 elt
540 for a file-scope tentative array defn that wasn't complete before. */
543 c_finish_incomplete_decl (tree decl)
545 if (TREE_CODE (decl) == VAR_DECL)
547 tree type = TREE_TYPE (decl);
548 if (type != error_mark_node
549 && TREE_CODE (type) == ARRAY_TYPE
550 && !DECL_EXTERNAL (decl)
551 && TYPE_DOMAIN (type) == 0)
553 warning (0, "array %q+D assumed to have one element", decl);
555 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
557 layout_decl (decl, 0);
562 /* The Objective-C front-end often needs to determine the current scope. */
565 objc_get_current_scope (void)
567 return current_scope;
570 /* The following function is used only by Objective-C. It needs to live here
571 because it accesses the innards of c_scope. */
574 objc_mark_locals_volatile (void *enclosing_blk)
576 struct c_scope *scope;
579 for (scope = current_scope;
580 scope && scope != enclosing_blk;
581 scope = scope->outer)
583 for (b = scope->bindings; b; b = b->prev)
584 objc_volatilize_decl (b->decl);
586 /* Do not climb up past the current function. */
587 if (scope->function_body)
592 /* Nonzero if we are currently in file scope. */
595 global_bindings_p (void)
597 return current_scope == file_scope && !c_override_global_bindings_to_false;
601 keep_next_level (void)
603 keep_next_level_flag = true;
606 /* Identify this scope as currently being filled with parameters. */
609 declare_parm_level (void)
611 current_scope->parm_flag = true;
617 if (next_is_function_body)
619 /* This is the transition from the parameters to the top level
620 of the function body. These are the same scope
621 (C99 6.2.1p4,6) so we do not push another scope structure.
622 next_is_function_body is set only by store_parm_decls, which
623 in turn is called when and only when we are about to
624 encounter the opening curly brace for the function body.
626 The outermost block of a function always gets a BLOCK node,
627 because the debugging output routines expect that each
628 function has at least one BLOCK. */
629 current_scope->parm_flag = false;
630 current_scope->function_body = true;
631 current_scope->keep = true;
632 current_scope->outer_function = current_function_scope;
633 current_function_scope = current_scope;
635 keep_next_level_flag = false;
636 next_is_function_body = false;
640 struct c_scope *scope;
643 scope = scope_freelist;
644 scope_freelist = scope->outer;
647 scope = GGC_CNEW (struct c_scope);
649 scope->keep = keep_next_level_flag;
650 scope->outer = current_scope;
651 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
653 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
655 if (current_scope && scope->depth == 0)
658 sorry ("GCC supports only %u nested scopes", scope->depth);
661 current_scope = scope;
662 keep_next_level_flag = false;
666 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
669 set_type_context (tree type, tree context)
671 for (type = TYPE_MAIN_VARIANT (type); type;
672 type = TYPE_NEXT_VARIANT (type))
673 TYPE_CONTEXT (type) = context;
676 /* Exit a scope. Restore the state of the identifier-decl mappings
677 that were in effect when this scope was entered. Return a BLOCK
678 node containing all the DECLs in this scope that are of interest
679 to debug info generation. */
684 struct c_scope *scope = current_scope;
685 tree block, context, p;
688 bool functionbody = scope->function_body;
689 bool keep = functionbody || scope->keep || scope->bindings;
691 c_end_vm_scope (scope->depth);
693 /* If appropriate, create a BLOCK to record the decls for the life
698 block = make_node (BLOCK);
699 BLOCK_SUBBLOCKS (block) = scope->blocks;
700 TREE_USED (block) = 1;
702 /* In each subblock, record that this is its superior. */
703 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
704 BLOCK_SUPERCONTEXT (p) = block;
706 BLOCK_VARS (block) = 0;
709 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
710 scope must be set so that they point to the appropriate
711 construct, i.e. either to the current FUNCTION_DECL node, or
712 else to the BLOCK node we just constructed.
714 Note that for tagged types whose scope is just the formal
715 parameter list for some function type specification, we can't
716 properly set their TYPE_CONTEXTs here, because we don't have a
717 pointer to the appropriate FUNCTION_TYPE node readily available
718 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
719 type nodes get set in `grokdeclarator' as soon as we have created
720 the FUNCTION_TYPE node which will represent the "scope" for these
721 "parameter list local" tagged types. */
722 if (scope->function_body)
723 context = current_function_decl;
724 else if (scope == file_scope)
726 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
727 TREE_CHAIN (file_decl) = all_translation_units;
728 all_translation_units = file_decl;
734 /* Clear all bindings in this scope. */
735 for (b = scope->bindings; b; b = free_binding_and_advance (b))
738 switch (TREE_CODE (p))
741 /* Warnings for unused labels, errors for undefined labels. */
742 if (TREE_USED (p) && !DECL_INITIAL (p))
744 error ("label %q+D used but not defined", p);
745 DECL_INITIAL (p) = error_mark_node;
748 warn_for_unused_label (p);
750 /* Labels go in BLOCK_VARS. */
751 TREE_CHAIN (p) = BLOCK_VARS (block);
752 BLOCK_VARS (block) = p;
753 gcc_assert (I_LABEL_BINDING (b->id) == b);
754 I_LABEL_BINDING (b->id) = b->shadowed;
760 set_type_context (p, context);
762 /* Types may not have tag-names, in which case the type
763 appears in the bindings list with b->id NULL. */
766 gcc_assert (I_TAG_BINDING (b->id) == b);
767 I_TAG_BINDING (b->id) = b->shadowed;
772 /* Propagate TREE_ADDRESSABLE from nested functions to their
773 containing functions. */
774 if (!TREE_ASM_WRITTEN (p)
775 && DECL_INITIAL (p) != 0
776 && TREE_ADDRESSABLE (p)
777 && DECL_ABSTRACT_ORIGIN (p) != 0
778 && DECL_ABSTRACT_ORIGIN (p) != p)
779 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
780 if (!DECL_EXTERNAL (p)
782 && scope != file_scope
783 && scope != external_scope)
785 error ("nested function %q+D declared but never defined", p);
786 undef_nested_function = true;
788 else if (DECL_DECLARED_INLINE_P (p)
790 && !DECL_INITIAL (p))
792 /* C99 6.7.4p6: "a function with external linkage... declared
793 with an inline function specifier ... shall also be defined
794 in the same translation unit." */
795 if (!flag_gnu89_inline)
796 pedwarn (input_location, 0,
797 "inline function %q+D declared but never defined", p);
798 DECL_EXTERNAL (p) = 1;
804 /* Warnings for unused variables. */
806 && !TREE_NO_WARNING (p)
807 && !DECL_IN_SYSTEM_HEADER (p)
809 && !DECL_ARTIFICIAL (p)
810 && scope != file_scope
811 && scope != external_scope)
812 warning (OPT_Wunused_variable, "unused variable %q+D", p);
816 error ("type of array %q+D completed incompatibly with"
817 " implicit initialization", p);
824 /* All of these go in BLOCK_VARS, but only if this is the
825 binding in the home scope. */
828 TREE_CHAIN (p) = BLOCK_VARS (block);
829 BLOCK_VARS (block) = p;
831 else if (VAR_OR_FUNCTION_DECL_P (p))
833 /* For block local externs add a special
834 DECL_EXTERNAL decl for debug info generation. */
835 tree extp = copy_node (p);
837 DECL_EXTERNAL (extp) = 1;
838 TREE_STATIC (extp) = 0;
839 TREE_PUBLIC (extp) = 1;
840 DECL_INITIAL (extp) = NULL_TREE;
841 DECL_LANG_SPECIFIC (extp) = NULL;
842 DECL_CONTEXT (extp) = current_function_decl;
843 if (TREE_CODE (p) == FUNCTION_DECL)
845 DECL_RESULT (extp) = NULL_TREE;
846 DECL_SAVED_TREE (extp) = NULL_TREE;
847 DECL_STRUCT_FUNCTION (extp) = NULL;
849 if (b->locus != UNKNOWN_LOCATION)
850 DECL_SOURCE_LOCATION (extp) = b->locus;
851 TREE_CHAIN (extp) = BLOCK_VARS (block);
852 BLOCK_VARS (block) = extp;
854 /* If this is the file scope, and we are processing more
855 than one translation unit in this compilation, set
856 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
857 This makes same_translation_unit_p work, and causes
858 static declarations to be given disambiguating suffixes. */
859 if (scope == file_scope && num_in_fnames > 1)
861 DECL_CONTEXT (p) = context;
862 if (TREE_CODE (p) == TYPE_DECL)
863 set_type_context (TREE_TYPE (p), context);
867 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
868 already been put there by store_parm_decls. Unused-
869 parameter warnings are handled by function.c.
870 error_mark_node obviously does not go in BLOCK_VARS and
871 does not get unused-variable warnings. */
874 /* It is possible for a decl not to have a name. We get
875 here with b->id NULL in this case. */
878 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
879 I_SYMBOL_BINDING (b->id) = b->shadowed;
880 if (b->shadowed && b->shadowed->type)
881 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
891 /* Dispose of the block that we just made inside some higher level. */
892 if ((scope->function_body || scope == file_scope) && context)
894 DECL_INITIAL (context) = block;
895 BLOCK_SUPERCONTEXT (block) = context;
897 else if (scope->outer)
900 SCOPE_LIST_APPEND (scope->outer, blocks, block);
901 /* If we did not make a block for the scope just exited, any
902 blocks made for inner scopes must be carried forward so they
903 will later become subblocks of something else. */
904 else if (scope->blocks)
905 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
908 /* Pop the current scope, and free the structure for reuse. */
909 current_scope = scope->outer;
910 if (scope->function_body)
911 current_function_scope = scope->outer_function;
913 memset (scope, 0, sizeof (struct c_scope));
914 scope->outer = scope_freelist;
915 scope_freelist = scope;
921 push_file_scope (void)
929 file_scope = current_scope;
931 start_fname_decls ();
933 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
934 bind (DECL_NAME (decl), decl, file_scope,
935 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl));
939 pop_file_scope (void)
941 /* In case there were missing closebraces, get us back to the global
943 while (current_scope != file_scope)
946 /* __FUNCTION__ is defined at file scope (""). This
947 call may not be necessary as my tests indicate it
948 still works without it. */
949 finish_fname_decls ();
951 /* This is the point to write out a PCH if we're doing that.
952 In that case we do not want to do anything else. */
955 c_common_write_pch ();
959 /* Pop off the file scope and close this translation unit. */
963 maybe_apply_pending_pragma_weaks ();
964 cgraph_finalize_compilation_unit ();
968 /* Push a definition or a declaration of struct, union or enum tag "name".
969 "type" should be the type node.
970 We assume that the tag "name" is not already defined.
972 Note that the definition may really be just a forward reference.
973 In that case, the TYPE_SIZE will be zero. */
976 pushtag (tree name, tree type)
978 /* Record the identifier as the type's name if it has none. */
979 if (name && !TYPE_NAME (type))
980 TYPE_NAME (type) = name;
981 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false,
984 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
985 tagged type we just added to the current scope. This fake
986 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
987 to output a representation of a tagged type, and it also gives
988 us a convenient place to record the "scope start" address for the
991 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
993 /* An approximation for now, so we can tell this is a function-scope tag.
994 This will be updated in pop_scope. */
995 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
998 /* Subroutine of compare_decls. Allow harmless mismatches in return
999 and argument types provided that the type modes match. This function
1000 return a unified type given a suitable match, and 0 otherwise. */
1003 match_builtin_function_types (tree newtype, tree oldtype)
1005 tree newrettype, oldrettype;
1006 tree newargs, oldargs;
1007 tree trytype, tryargs;
1009 /* Accept the return type of the new declaration if same modes. */
1010 oldrettype = TREE_TYPE (oldtype);
1011 newrettype = TREE_TYPE (newtype);
1013 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1016 oldargs = TYPE_ARG_TYPES (oldtype);
1017 newargs = TYPE_ARG_TYPES (newtype);
1020 while (oldargs || newargs)
1024 || !TREE_VALUE (oldargs)
1025 || !TREE_VALUE (newargs)
1026 || TYPE_MODE (TREE_VALUE (oldargs))
1027 != TYPE_MODE (TREE_VALUE (newargs)))
1030 oldargs = TREE_CHAIN (oldargs);
1031 newargs = TREE_CHAIN (newargs);
1034 trytype = build_function_type (newrettype, tryargs);
1035 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1038 /* Subroutine of diagnose_mismatched_decls. Check for function type
1039 mismatch involving an empty arglist vs a nonempty one and give clearer
1042 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1043 tree newtype, tree oldtype)
1047 if (TREE_CODE (olddecl) != FUNCTION_DECL
1048 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1049 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1051 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1054 t = TYPE_ARG_TYPES (oldtype);
1056 t = TYPE_ARG_TYPES (newtype);
1057 for (; t; t = TREE_CHAIN (t))
1059 tree type = TREE_VALUE (t);
1061 if (TREE_CHAIN (t) == 0
1062 && TYPE_MAIN_VARIANT (type) != void_type_node)
1064 inform (input_location, "a parameter list with an ellipsis can%'t match "
1065 "an empty parameter name list declaration");
1069 if (c_type_promotes_to (type) != type)
1071 inform (input_location, "an argument type that has a default promotion can%'t match "
1072 "an empty parameter name list declaration");
1078 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1079 old-style function definition, NEWDECL is a prototype declaration.
1080 Diagnose inconsistencies in the argument list. Returns TRUE if
1081 the prototype is compatible, FALSE if not. */
1083 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1085 tree newargs, oldargs;
1088 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1090 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1091 newargs = TYPE_ARG_TYPES (newtype);
1096 tree oldargtype = TREE_VALUE (oldargs);
1097 tree newargtype = TREE_VALUE (newargs);
1099 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1102 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1103 newargtype = TYPE_MAIN_VARIANT (newargtype);
1105 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1108 /* Reaching the end of just one list means the two decls don't
1109 agree on the number of arguments. */
1110 if (END_OF_ARGLIST (oldargtype))
1112 error ("prototype for %q+D declares more arguments "
1113 "than previous old-style definition", newdecl);
1116 else if (END_OF_ARGLIST (newargtype))
1118 error ("prototype for %q+D declares fewer arguments "
1119 "than previous old-style definition", newdecl);
1123 /* Type for passing arg must be consistent with that declared
1125 else if (!comptypes (oldargtype, newargtype))
1127 error ("prototype for %q+D declares argument %d"
1128 " with incompatible type",
1133 oldargs = TREE_CHAIN (oldargs);
1134 newargs = TREE_CHAIN (newargs);
1138 /* If we get here, no errors were found, but do issue a warning
1139 for this poor-style construct. */
1140 warning (0, "prototype for %q+D follows non-prototype definition",
1143 #undef END_OF_ARGLIST
1146 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1147 first in a pair of mismatched declarations, using the diagnostic
1150 locate_old_decl (tree decl)
1152 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1154 else if (DECL_INITIAL (decl))
1155 inform (input_location, "previous definition of %q+D was here", decl);
1156 else if (C_DECL_IMPLICIT (decl))
1157 inform (input_location, "previous implicit declaration of %q+D was here", decl);
1159 inform (input_location, "previous declaration of %q+D was here", decl);
1162 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1163 Returns true if the caller should proceed to merge the two, false
1164 if OLDDECL should simply be discarded. As a side effect, issues
1165 all necessary diagnostics for invalid or poor-style combinations.
1166 If it returns true, writes the types of NEWDECL and OLDDECL to
1167 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1168 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1171 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1172 tree *newtypep, tree *oldtypep)
1174 tree newtype, oldtype;
1175 bool pedwarned = false;
1176 bool warned = false;
1179 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1180 && DECL_EXTERNAL (DECL))
1182 /* If we have error_mark_node for either decl or type, just discard
1183 the previous decl - we're in an error cascade already. */
1184 if (olddecl == error_mark_node || newdecl == error_mark_node)
1186 *oldtypep = oldtype = TREE_TYPE (olddecl);
1187 *newtypep = newtype = TREE_TYPE (newdecl);
1188 if (oldtype == error_mark_node || newtype == error_mark_node)
1191 /* Two different categories of symbol altogether. This is an error
1192 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1193 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1195 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1196 && DECL_BUILT_IN (olddecl)
1197 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1199 error ("%q+D redeclared as different kind of symbol", newdecl);
1200 locate_old_decl (olddecl);
1202 else if (TREE_PUBLIC (newdecl))
1203 warning (0, "built-in function %q+D declared as non-function",
1206 warning (OPT_Wshadow, "declaration of %q+D shadows "
1207 "a built-in function", newdecl);
1211 /* Enumerators have no linkage, so may only be declared once in a
1213 if (TREE_CODE (olddecl) == CONST_DECL)
1215 error ("redeclaration of enumerator %q+D", newdecl);
1216 locate_old_decl (olddecl);
1220 if (!comptypes (oldtype, newtype))
1222 if (TREE_CODE (olddecl) == FUNCTION_DECL
1223 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1225 /* Accept harmless mismatch in function types.
1226 This is for the ffs and fprintf builtins. */
1227 tree trytype = match_builtin_function_types (newtype, oldtype);
1229 if (trytype && comptypes (newtype, trytype))
1230 *oldtypep = oldtype = trytype;
1233 /* If types don't match for a built-in, throw away the
1234 built-in. No point in calling locate_old_decl here, it
1235 won't print anything. */
1236 warning (0, "conflicting types for built-in function %q+D",
1241 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1242 && DECL_IS_BUILTIN (olddecl))
1244 /* A conflicting function declaration for a predeclared
1245 function that isn't actually built in. Objective C uses
1246 these. The new declaration silently overrides everything
1247 but the volatility (i.e. noreturn) indication. See also
1248 below. FIXME: Make Objective C use normal builtins. */
1249 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1252 /* Permit void foo (...) to match int foo (...) if the latter is
1253 the definition and implicit int was used. See
1254 c-torture/compile/920625-2.c. */
1255 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1256 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1257 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1258 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1260 pedwarned = pedwarn (input_location, 0,
1261 "conflicting types for %q+D", newdecl);
1262 /* Make sure we keep void as the return type. */
1263 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1264 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1266 /* Permit void foo (...) to match an earlier call to foo (...) with
1267 no declared type (thus, implicitly int). */
1268 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1269 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1270 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1271 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1273 pedwarned = pedwarn (input_location, 0,
1274 "conflicting types for %q+D", newdecl);
1275 /* Make sure we keep void as the return type. */
1276 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1280 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1281 error ("conflicting type qualifiers for %q+D", newdecl);
1283 error ("conflicting types for %q+D", newdecl);
1284 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1285 locate_old_decl (olddecl);
1290 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1291 but silently ignore the redeclaration if either is in a system
1292 header. (Conflicting redeclarations were handled above.) */
1293 if (TREE_CODE (newdecl) == TYPE_DECL)
1295 if (DECL_IN_SYSTEM_HEADER (newdecl)
1296 || DECL_IN_SYSTEM_HEADER (olddecl)
1297 || TREE_NO_WARNING (newdecl)
1298 || TREE_NO_WARNING (olddecl))
1299 return true; /* Allow OLDDECL to continue in use. */
1301 error ("redefinition of typedef %q+D", newdecl);
1302 locate_old_decl (olddecl);
1306 /* Function declarations can either be 'static' or 'extern' (no
1307 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1308 can never conflict with each other on account of linkage
1309 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1310 gnu89 mode permits two definitions if one is 'extern inline' and
1311 one is not. The non- extern-inline definition supersedes the
1312 extern-inline definition. */
1314 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1316 /* If you declare a built-in function name as static, or
1317 define the built-in with an old-style definition (so we
1318 can't validate the argument list) the built-in definition is
1319 overridden, but optionally warn this was a bad choice of name. */
1320 if (DECL_BUILT_IN (olddecl)
1321 && !C_DECL_DECLARED_BUILTIN (olddecl)
1322 && (!TREE_PUBLIC (newdecl)
1323 || (DECL_INITIAL (newdecl)
1324 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1326 warning (OPT_Wshadow, "declaration of %q+D shadows "
1327 "a built-in function", newdecl);
1328 /* Discard the old built-in function. */
1332 if (DECL_INITIAL (newdecl))
1334 if (DECL_INITIAL (olddecl))
1336 /* If both decls are in the same TU and the new declaration
1337 isn't overriding an extern inline reject the new decl.
1338 In c99, no overriding is allowed in the same translation
1340 if ((!DECL_EXTERN_INLINE (olddecl)
1341 || DECL_EXTERN_INLINE (newdecl)
1342 || (!flag_gnu89_inline
1343 && (!DECL_DECLARED_INLINE_P (olddecl)
1344 || !lookup_attribute ("gnu_inline",
1345 DECL_ATTRIBUTES (olddecl)))
1346 && (!DECL_DECLARED_INLINE_P (newdecl)
1347 || !lookup_attribute ("gnu_inline",
1348 DECL_ATTRIBUTES (newdecl))))
1350 && same_translation_unit_p (newdecl, olddecl))
1352 error ("redefinition of %q+D", newdecl);
1353 locate_old_decl (olddecl);
1358 /* If we have a prototype after an old-style function definition,
1359 the argument types must be checked specially. */
1360 else if (DECL_INITIAL (olddecl)
1361 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1362 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1363 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1365 locate_old_decl (olddecl);
1368 /* A non-static declaration (even an "extern") followed by a
1369 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1370 The same is true for a static forward declaration at block
1371 scope followed by a non-static declaration/definition at file
1372 scope. Static followed by non-static at the same scope is
1373 not undefined behavior, and is the most convenient way to get
1374 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1375 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1376 we do diagnose it if -Wtraditional. */
1377 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1379 /* Two exceptions to the rule. If olddecl is an extern
1380 inline, or a predeclared function that isn't actually
1381 built in, newdecl silently overrides olddecl. The latter
1382 occur only in Objective C; see also above. (FIXME: Make
1383 Objective C use normal builtins.) */
1384 if (!DECL_IS_BUILTIN (olddecl)
1385 && !DECL_EXTERN_INLINE (olddecl))
1387 error ("static declaration of %q+D follows "
1388 "non-static declaration", newdecl);
1389 locate_old_decl (olddecl);
1393 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1395 if (DECL_CONTEXT (olddecl))
1397 error ("non-static declaration of %q+D follows "
1398 "static declaration", newdecl);
1399 locate_old_decl (olddecl);
1402 else if (warn_traditional)
1404 warned |= warning (OPT_Wtraditional,
1405 "non-static declaration of %q+D "
1406 "follows static declaration", newdecl);
1410 /* Make sure gnu_inline attribute is either not present, or
1411 present on all inline decls. */
1412 if (DECL_DECLARED_INLINE_P (olddecl)
1413 && DECL_DECLARED_INLINE_P (newdecl))
1415 bool newa = lookup_attribute ("gnu_inline",
1416 DECL_ATTRIBUTES (newdecl)) != NULL;
1417 bool olda = lookup_attribute ("gnu_inline",
1418 DECL_ATTRIBUTES (olddecl)) != NULL;
1421 error ("%<gnu_inline%> attribute present on %q+D",
1422 newa ? newdecl : olddecl);
1423 error ("%Jbut not here", newa ? olddecl : newdecl);
1427 else if (TREE_CODE (newdecl) == VAR_DECL)
1429 /* Only variables can be thread-local, and all declarations must
1430 agree on this property. */
1431 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1433 /* Nothing to check. Since OLDDECL is marked threadprivate
1434 and NEWDECL does not have a thread-local attribute, we
1435 will merge the threadprivate attribute into NEWDECL. */
1438 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1440 if (DECL_THREAD_LOCAL_P (newdecl))
1441 error ("thread-local declaration of %q+D follows "
1442 "non-thread-local declaration", newdecl);
1444 error ("non-thread-local declaration of %q+D follows "
1445 "thread-local declaration", newdecl);
1447 locate_old_decl (olddecl);
1451 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1452 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1454 error ("redefinition of %q+D", newdecl);
1455 locate_old_decl (olddecl);
1459 /* Objects declared at file scope: if the first declaration had
1460 external linkage (even if it was an external reference) the
1461 second must have external linkage as well, or the behavior is
1462 undefined. If the first declaration had internal linkage, then
1463 the second must too, or else be an external reference (in which
1464 case the composite declaration still has internal linkage).
1465 As for function declarations, we warn about the static-then-
1466 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1467 if (DECL_FILE_SCOPE_P (newdecl)
1468 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1470 if (DECL_EXTERNAL (newdecl))
1472 if (!DECL_FILE_SCOPE_P (olddecl))
1474 error ("extern declaration of %q+D follows "
1475 "declaration with no linkage", newdecl);
1476 locate_old_decl (olddecl);
1479 else if (warn_traditional)
1481 warned |= warning (OPT_Wtraditional,
1482 "non-static declaration of %q+D "
1483 "follows static declaration", newdecl);
1488 if (TREE_PUBLIC (newdecl))
1489 error ("non-static declaration of %q+D follows "
1490 "static declaration", newdecl);
1492 error ("static declaration of %q+D follows "
1493 "non-static declaration", newdecl);
1495 locate_old_decl (olddecl);
1499 /* Two objects with the same name declared at the same block
1500 scope must both be external references (6.7p3). */
1501 else if (!DECL_FILE_SCOPE_P (newdecl))
1503 if (DECL_EXTERNAL (newdecl))
1505 /* Extern with initializer at block scope, which will
1506 already have received an error. */
1508 else if (DECL_EXTERNAL (olddecl))
1510 error ("declaration of %q+D with no linkage follows "
1511 "extern declaration", newdecl);
1512 locate_old_decl (olddecl);
1516 error ("redeclaration of %q+D with no linkage", newdecl);
1517 locate_old_decl (olddecl);
1525 /* All decls must agree on a visibility. */
1526 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
1527 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1528 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1530 warned |= warning (0, "redeclaration of %q+D with different visibility "
1531 "(old visibility preserved)", newdecl);
1534 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1536 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1537 if (DECL_DECLARED_INLINE_P (newdecl)
1538 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1540 warned |= warning (OPT_Wattributes,
1541 "inline declaration of %qD follows "
1542 "declaration with attribute noinline", newdecl);
1544 else if (DECL_DECLARED_INLINE_P (olddecl)
1545 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1547 warned |= warning (OPT_Wattributes,
1548 "declaration of %q+D with attribute "
1549 "noinline follows inline declaration ", newdecl);
1552 else /* PARM_DECL, VAR_DECL */
1554 /* Redeclaration of a parameter is a constraint violation (this is
1555 not explicitly stated, but follows from C99 6.7p3 [no more than
1556 one declaration of the same identifier with no linkage in the
1557 same scope, except type tags] and 6.2.2p6 [parameters have no
1558 linkage]). We must check for a forward parameter declaration,
1559 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1560 an extension, the mandatory diagnostic for which is handled by
1561 mark_forward_parm_decls. */
1563 if (TREE_CODE (newdecl) == PARM_DECL
1564 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1566 error ("redefinition of parameter %q+D", newdecl);
1567 locate_old_decl (olddecl);
1572 /* Optional warning for completely redundant decls. */
1573 if (!warned && !pedwarned
1574 && warn_redundant_decls
1575 /* Don't warn about a function declaration followed by a
1577 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1578 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1579 /* Don't warn about redundant redeclarations of builtins. */
1580 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1581 && !DECL_BUILT_IN (newdecl)
1582 && DECL_BUILT_IN (olddecl)
1583 && !C_DECL_DECLARED_BUILTIN (olddecl))
1584 /* Don't warn about an extern followed by a definition. */
1585 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1586 /* Don't warn about forward parameter decls. */
1587 && !(TREE_CODE (newdecl) == PARM_DECL
1588 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1589 /* Don't warn about a variable definition following a declaration. */
1590 && !(TREE_CODE (newdecl) == VAR_DECL
1591 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
1593 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
1597 /* Report location of previous decl/defn. */
1598 if (warned || pedwarned)
1599 locate_old_decl (olddecl);
1601 #undef DECL_EXTERN_INLINE
1606 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1607 consistent with OLDDECL, but carries new information. Merge the
1608 new information into OLDDECL. This function issues no
1612 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1614 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1615 && DECL_INITIAL (newdecl) != 0);
1616 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
1617 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
1618 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
1619 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
1620 bool extern_changed = false;
1622 /* For real parm decl following a forward decl, rechain the old decl
1623 in its new location and clear TREE_ASM_WRITTEN (it's not a
1624 forward decl anymore). */
1625 if (TREE_CODE (newdecl) == PARM_DECL
1626 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1628 struct c_binding *b, **here;
1630 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1631 if ((*here)->decl == olddecl)
1638 b->prev = current_scope->bindings;
1639 current_scope->bindings = b;
1641 TREE_ASM_WRITTEN (olddecl) = 0;
1644 DECL_ATTRIBUTES (newdecl)
1645 = targetm.merge_decl_attributes (olddecl, newdecl);
1647 /* Merge the data types specified in the two decls. */
1649 = TREE_TYPE (olddecl)
1650 = composite_type (newtype, oldtype);
1652 /* Lay the type out, unless already done. */
1653 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1655 if (TREE_TYPE (newdecl) != error_mark_node)
1656 layout_type (TREE_TYPE (newdecl));
1657 if (TREE_CODE (newdecl) != FUNCTION_DECL
1658 && TREE_CODE (newdecl) != TYPE_DECL
1659 && TREE_CODE (newdecl) != CONST_DECL)
1660 layout_decl (newdecl, 0);
1664 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1665 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1666 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1667 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1668 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1670 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1671 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
1675 /* Keep the old rtl since we can safely use it. */
1676 if (HAS_RTL_P (olddecl))
1677 COPY_DECL_RTL (olddecl, newdecl);
1679 /* Merge the type qualifiers. */
1680 if (TREE_READONLY (newdecl))
1681 TREE_READONLY (olddecl) = 1;
1683 if (TREE_THIS_VOLATILE (newdecl))
1684 TREE_THIS_VOLATILE (olddecl) = 1;
1686 /* Merge deprecatedness. */
1687 if (TREE_DEPRECATED (newdecl))
1688 TREE_DEPRECATED (olddecl) = 1;
1690 /* If a decl is in a system header and the other isn't, keep the one on the
1691 system header. Otherwise, keep source location of definition rather than
1692 declaration and of prototype rather than non-prototype unless that
1693 prototype is built-in. */
1694 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
1695 && DECL_IN_SYSTEM_HEADER (olddecl)
1696 && !DECL_IN_SYSTEM_HEADER (newdecl) )
1697 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1698 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
1699 && DECL_IN_SYSTEM_HEADER (newdecl)
1700 && !DECL_IN_SYSTEM_HEADER (olddecl))
1701 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
1702 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1703 || (old_is_prototype && !new_is_prototype
1704 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1705 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1707 /* Merge the initialization information. */
1708 if (DECL_INITIAL (newdecl) == 0)
1709 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1711 /* Merge the threadprivate attribute. */
1712 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
1714 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1715 C_DECL_THREADPRIVATE_P (newdecl) = 1;
1718 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1720 /* Merge the section attribute.
1721 We want to issue an error if the sections conflict but that
1722 must be done later in decl_attributes since we are called
1723 before attributes are assigned. */
1724 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1725 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1727 /* Copy the assembler name.
1728 Currently, it can only be defined in the prototype. */
1729 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1731 /* Use visibility of whichever declaration had it specified */
1732 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1734 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1735 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1738 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1740 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1741 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1742 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1743 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1744 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1745 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1746 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1747 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1748 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1749 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1750 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1753 /* Merge the storage class information. */
1754 merge_weak (newdecl, olddecl);
1756 /* For functions, static overrides non-static. */
1757 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1759 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1760 /* This is since we don't automatically
1761 copy the attributes of NEWDECL into OLDDECL. */
1762 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1763 /* If this clears `static', clear it in the identifier too. */
1764 if (!TREE_PUBLIC (olddecl))
1765 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1769 /* In c99, 'extern' declaration before (or after) 'inline' means this
1770 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
1772 if (TREE_CODE (newdecl) == FUNCTION_DECL
1773 && !flag_gnu89_inline
1774 && (DECL_DECLARED_INLINE_P (newdecl)
1775 || DECL_DECLARED_INLINE_P (olddecl))
1776 && (!DECL_DECLARED_INLINE_P (newdecl)
1777 || !DECL_DECLARED_INLINE_P (olddecl)
1778 || !DECL_EXTERNAL (olddecl))
1779 && DECL_EXTERNAL (newdecl)
1780 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
1781 && !current_function_decl)
1782 DECL_EXTERNAL (newdecl) = 0;
1784 if (DECL_EXTERNAL (newdecl))
1786 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1787 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1789 /* An extern decl does not override previous storage class. */
1790 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1791 if (!DECL_EXTERNAL (newdecl))
1793 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1794 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1799 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1800 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1803 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1805 /* If we're redefining a function previously defined as extern
1806 inline, make sure we emit debug info for the inline before we
1807 throw it away, in case it was inlined into a function that
1808 hasn't been written out yet. */
1809 if (new_is_definition && DECL_INITIAL (olddecl))
1810 /* The new defn must not be inline. */
1811 DECL_UNINLINABLE (newdecl) = 1;
1814 /* If either decl says `inline', this fn is inline, unless
1815 its definition was passed already. */
1816 if (DECL_DECLARED_INLINE_P (newdecl)
1817 || DECL_DECLARED_INLINE_P (olddecl))
1818 DECL_DECLARED_INLINE_P (newdecl) = 1;
1820 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1821 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1823 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1824 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1825 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1826 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1829 if (DECL_BUILT_IN (olddecl))
1831 /* If redeclaring a builtin function, it stays built in.
1832 But it gets tagged as having been declared. */
1833 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1834 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1835 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1836 if (new_is_prototype)
1837 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
1839 C_DECL_BUILTIN_PROTOTYPE (newdecl)
1840 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
1843 /* Preserve function specific target and optimization options */
1844 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1845 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1846 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1847 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1849 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1850 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1851 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1852 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1854 /* Also preserve various other info from the definition. */
1855 if (!new_is_definition)
1858 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1859 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1860 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1861 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1862 gimple_set_body (newdecl, gimple_body (olddecl));
1863 DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl));
1864 for (t = DECL_ARGUMENTS (newdecl); t ; t = TREE_CHAIN (t))
1865 DECL_CONTEXT (t) = newdecl;
1867 /* See if we've got a function to instantiate from. */
1868 if (DECL_SAVED_TREE (olddecl))
1869 DECL_ABSTRACT_ORIGIN (newdecl)
1870 = DECL_ABSTRACT_ORIGIN (olddecl);
1874 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
1876 /* Merge the USED information. */
1877 if (TREE_USED (olddecl))
1878 TREE_USED (newdecl) = 1;
1879 else if (TREE_USED (newdecl))
1880 TREE_USED (olddecl) = 1;
1882 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1883 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1885 unsigned olddecl_uid = DECL_UID (olddecl);
1886 tree olddecl_context = DECL_CONTEXT (olddecl);
1887 tree olddecl_arguments = NULL;
1888 if (TREE_CODE (olddecl) == FUNCTION_DECL)
1889 olddecl_arguments = DECL_ARGUMENTS (olddecl);
1891 memcpy ((char *) olddecl + sizeof (struct tree_common),
1892 (char *) newdecl + sizeof (struct tree_common),
1893 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1894 switch (TREE_CODE (olddecl))
1897 gimple_set_body (olddecl, gimple_body (newdecl));
1907 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1908 (char *) newdecl + sizeof (struct tree_decl_common),
1909 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
1914 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1915 (char *) newdecl + sizeof (struct tree_decl_common),
1916 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
1918 DECL_UID (olddecl) = olddecl_uid;
1919 DECL_CONTEXT (olddecl) = olddecl_context;
1920 if (TREE_CODE (olddecl) == FUNCTION_DECL)
1921 DECL_ARGUMENTS (olddecl) = olddecl_arguments;
1924 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1925 so that encode_section_info has a chance to look at the new decl
1926 flags and attributes. */
1927 if (DECL_RTL_SET_P (olddecl)
1928 && (TREE_CODE (olddecl) == FUNCTION_DECL
1929 || (TREE_CODE (olddecl) == VAR_DECL
1930 && TREE_STATIC (olddecl))))
1931 make_decl_rtl (olddecl);
1933 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
1934 and the definition is coming from the old version, cgraph needs
1935 to be called again. */
1936 if (extern_changed && !new_is_definition
1937 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
1938 cgraph_mark_if_needed (olddecl);
1941 /* Handle when a new declaration NEWDECL has the same name as an old
1942 one OLDDECL in the same binding contour. Prints an error message
1945 If safely possible, alter OLDDECL to look like NEWDECL, and return
1946 true. Otherwise, return false. */
1949 duplicate_decls (tree newdecl, tree olddecl)
1951 tree newtype = NULL, oldtype = NULL;
1953 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1955 /* Avoid `unused variable' and other warnings for OLDDECL. */
1956 TREE_NO_WARNING (olddecl) = 1;
1960 merge_decls (newdecl, olddecl, newtype, oldtype);
1965 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1967 warn_if_shadowing (tree new_decl)
1969 struct c_binding *b;
1971 /* Shadow warnings wanted? */
1973 /* No shadow warnings for internally generated vars. */
1974 || DECL_IS_BUILTIN (new_decl)
1975 /* No shadow warnings for vars made for inlining. */
1976 || DECL_FROM_INLINE (new_decl))
1979 /* Is anything being shadowed? Invisible decls do not count. */
1980 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1981 if (b->decl && b->decl != new_decl && !b->invisible)
1983 tree old_decl = b->decl;
1985 if (old_decl == error_mark_node)
1987 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
1988 "non-variable", new_decl);
1991 else if (TREE_CODE (old_decl) == PARM_DECL)
1992 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
1994 else if (DECL_FILE_SCOPE_P (old_decl))
1995 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
1996 "declaration", new_decl);
1997 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1998 && DECL_BUILT_IN (old_decl))
2000 warning (OPT_Wshadow, "declaration of %q+D shadows "
2001 "a built-in function", new_decl);
2005 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
2008 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
2014 /* Record a decl-node X as belonging to the current lexical scope.
2015 Check for errors (such as an incompatible declaration for the same
2016 name already seen in the same scope).
2018 Returns either X or an old decl for the same name.
2019 If an old decl is returned, it may have been smashed
2020 to agree with what X says. */
2025 tree name = DECL_NAME (x);
2026 struct c_scope *scope = current_scope;
2027 struct c_binding *b;
2028 bool nested = false;
2029 location_t locus = DECL_SOURCE_LOCATION (x);
2031 /* Must set DECL_CONTEXT for everything not at file scope or
2032 DECL_FILE_SCOPE_P won't work. Local externs don't count
2033 unless they have initializers (which generate code). */
2034 if (current_function_decl
2035 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2036 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2037 DECL_CONTEXT (x) = current_function_decl;
2039 /* If this is of variably modified type, prevent jumping into its
2041 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
2042 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
2043 c_begin_vm_scope (scope->depth);
2045 /* Anonymous decls are just inserted in the scope. */
2048 bind (name, x, scope, /*invisible=*/false, /*nested=*/false,
2053 /* First, see if there is another declaration with the same name in
2054 the current scope. If there is, duplicate_decls may do all the
2055 work for us. If duplicate_decls returns false, that indicates
2056 two incompatible decls in the same scope; we are to silently
2057 replace the old one (duplicate_decls has issued all appropriate
2058 diagnostics). In particular, we should not consider possible
2059 duplicates in the external scope, or shadowing. */
2060 b = I_SYMBOL_BINDING (name);
2061 if (b && B_IN_SCOPE (b, scope))
2063 struct c_binding *b_ext, *b_use;
2064 tree type = TREE_TYPE (x);
2065 tree visdecl = b->decl;
2066 tree vistype = TREE_TYPE (visdecl);
2067 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2068 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2069 b->inner_comp = false;
2072 /* If this is an external linkage declaration, we should check
2073 for compatibility with the type in the external scope before
2074 setting the type at this scope based on the visible
2075 information only. */
2076 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2078 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2079 b_ext = b_ext->shadowed;
2084 TREE_TYPE (b_use->decl) = b_use->type;
2087 if (duplicate_decls (x, b_use->decl))
2091 /* Save the updated type in the external scope and
2092 restore the proper type for this scope. */
2094 if (comptypes (vistype, type))
2095 thistype = composite_type (vistype, type);
2097 thistype = TREE_TYPE (b_use->decl);
2098 b_use->type = TREE_TYPE (b_use->decl);
2099 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2100 && DECL_BUILT_IN (b_use->decl))
2102 = build_type_attribute_variant (thistype,
2105 TREE_TYPE (b_use->decl) = thistype;
2110 goto skip_external_and_shadow_checks;
2113 /* All declarations with external linkage, and all external
2114 references, go in the external scope, no matter what scope is
2115 current. However, the binding in that scope is ignored for
2116 purposes of normal name lookup. A separate binding structure is
2117 created in the requested scope; this governs the normal
2118 visibility of the symbol.
2120 The binding in the externals scope is used exclusively for
2121 detecting duplicate declarations of the same object, no matter
2122 what scope they are in; this is what we do here. (C99 6.2.7p2:
2123 All declarations that refer to the same object or function shall
2124 have compatible type; otherwise, the behavior is undefined.) */
2125 if (DECL_EXTERNAL (x) || scope == file_scope)
2127 tree type = TREE_TYPE (x);
2130 bool type_saved = false;
2131 if (b && !B_IN_EXTERNAL_SCOPE (b)
2132 && (TREE_CODE (b->decl) == FUNCTION_DECL
2133 || TREE_CODE (b->decl) == VAR_DECL)
2134 && DECL_FILE_SCOPE_P (b->decl))
2137 vistype = TREE_TYPE (visdecl);
2139 if (scope != file_scope
2140 && !DECL_IN_SYSTEM_HEADER (x))
2141 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2143 while (b && !B_IN_EXTERNAL_SCOPE (b))
2145 /* If this decl might be modified, save its type. This is
2146 done here rather than when the decl is first bound
2147 because the type may change after first binding, through
2148 being completed or through attributes being added. If we
2149 encounter multiple such decls, only the first should have
2150 its type saved; the others will already have had their
2151 proper types saved and the types will not have changed as
2152 their scopes will not have been re-entered. */
2153 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2155 b->type = TREE_TYPE (b->decl);
2158 if (B_IN_FILE_SCOPE (b)
2159 && TREE_CODE (b->decl) == VAR_DECL
2160 && TREE_STATIC (b->decl)
2161 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2162 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2163 && TREE_CODE (type) == ARRAY_TYPE
2164 && TYPE_DOMAIN (type)
2165 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2166 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2168 /* Array type completed in inner scope, which should be
2169 diagnosed if the completion does not have size 1 and
2170 it does not get completed in the file scope. */
2171 b->inner_comp = true;
2176 /* If a matching external declaration has been found, set its
2177 type to the composite of all the types of that declaration.
2178 After the consistency checks, it will be reset to the
2179 composite of the visible types only. */
2180 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2182 TREE_TYPE (b->decl) = b->type;
2184 /* The point of the same_translation_unit_p check here is,
2185 we want to detect a duplicate decl for a construct like
2186 foo() { extern bar(); } ... static bar(); but not if
2187 they are in different translation units. In any case,
2188 the static does not go in the externals scope. */
2190 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2191 && duplicate_decls (x, b->decl))
2196 if (comptypes (vistype, type))
2197 thistype = composite_type (vistype, type);
2199 thistype = TREE_TYPE (b->decl);
2203 b->type = TREE_TYPE (b->decl);
2204 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2206 = build_type_attribute_variant (thistype,
2207 TYPE_ATTRIBUTES (b->type));
2208 TREE_TYPE (b->decl) = thistype;
2209 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true,
2213 else if (TREE_PUBLIC (x))
2215 if (visdecl && !b && duplicate_decls (x, visdecl))
2217 /* An external declaration at block scope referring to a
2218 visible entity with internal linkage. The composite
2219 type will already be correct for this scope, so we
2220 just need to fall through to make the declaration in
2227 bind (name, x, external_scope, /*invisible=*/true,
2228 /*nested=*/false, locus);
2234 if (TREE_CODE (x) != PARM_DECL)
2235 warn_if_shadowing (x);
2237 skip_external_and_shadow_checks:
2238 if (TREE_CODE (x) == TYPE_DECL)
2239 set_underlying_type (x);
2241 bind (name, x, scope, /*invisible=*/false, nested, locus);
2243 /* If x's type is incomplete because it's based on a
2244 structure or union which has not yet been fully declared,
2245 attach it to that structure or union type, so we can go
2246 back and complete the variable declaration later, if the
2247 structure or union gets fully declared.
2249 If the input is erroneous, we can have error_mark in the type
2250 slot (e.g. "f(void a, ...)") - that doesn't count as an
2252 if (TREE_TYPE (x) != error_mark_node
2253 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2255 tree element = TREE_TYPE (x);
2257 while (TREE_CODE (element) == ARRAY_TYPE)
2258 element = TREE_TYPE (element);
2259 element = TYPE_MAIN_VARIANT (element);
2261 if ((TREE_CODE (element) == RECORD_TYPE
2262 || TREE_CODE (element) == UNION_TYPE)
2263 && (TREE_CODE (x) != TYPE_DECL
2264 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2265 && !COMPLETE_TYPE_P (element))
2266 C_TYPE_INCOMPLETE_VARS (element)
2267 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2272 /* Record X as belonging to file scope.
2273 This is used only internally by the Objective-C front end,
2274 and is limited to its needs. duplicate_decls is not called;
2275 if there is any preexisting decl for this identifier, it is an ICE. */
2278 pushdecl_top_level (tree x)
2281 bool nested = false;
2282 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2284 name = DECL_NAME (x);
2286 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2288 if (TREE_PUBLIC (x))
2290 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false,
2295 bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION);
2301 implicit_decl_warning (tree id, tree olddecl)
2303 if (warn_implicit_function_declaration)
2308 warned = pedwarn (input_location, OPT_Wimplicit_function_declaration,
2309 "implicit declaration of function %qE", id);
2311 warned = warning (OPT_Wimplicit_function_declaration,
2312 G_("implicit declaration of function %qE"), id);
2313 if (olddecl && warned)
2314 locate_old_decl (olddecl);
2318 /* Generate an implicit declaration for identifier FUNCTIONID as a
2319 function of type int (). */
2322 implicitly_declare (tree functionid)
2324 struct c_binding *b;
2328 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2330 if (B_IN_SCOPE (b, external_scope))
2339 if (decl == error_mark_node)
2342 /* FIXME: Objective-C has weird not-really-builtin functions
2343 which are supposed to be visible automatically. They wind up
2344 in the external scope because they're pushed before the file
2345 scope gets created. Catch this here and rebind them into the
2347 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2349 bind (functionid, decl, file_scope,
2350 /*invisible=*/false, /*nested=*/true,
2351 DECL_SOURCE_LOCATION (decl));
2356 tree newtype = default_function_type;
2358 TREE_TYPE (decl) = b->type;
2359 /* Implicit declaration of a function already declared
2360 (somehow) in a different scope, or as a built-in.
2361 If this is the first time this has happened, warn;
2362 then recycle the old declaration but with the new type. */
2363 if (!C_DECL_IMPLICIT (decl))
2365 implicit_decl_warning (functionid, decl);
2366 C_DECL_IMPLICIT (decl) = 1;
2368 if (DECL_BUILT_IN (decl))
2370 newtype = build_type_attribute_variant (newtype,
2372 (TREE_TYPE (decl)));
2373 if (!comptypes (newtype, TREE_TYPE (decl)))
2375 warning (0, "incompatible implicit declaration of built-in"
2376 " function %qD", decl);
2377 newtype = TREE_TYPE (decl);
2382 if (!comptypes (newtype, TREE_TYPE (decl)))
2384 error ("incompatible implicit declaration of function %qD",
2386 locate_old_decl (decl);
2389 b->type = TREE_TYPE (decl);
2390 TREE_TYPE (decl) = newtype;
2391 bind (functionid, decl, current_scope,
2392 /*invisible=*/false, /*nested=*/true,
2393 DECL_SOURCE_LOCATION (decl));
2398 /* Not seen before. */
2399 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2400 DECL_EXTERNAL (decl) = 1;
2401 TREE_PUBLIC (decl) = 1;
2402 C_DECL_IMPLICIT (decl) = 1;
2403 implicit_decl_warning (functionid, 0);
2404 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2406 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2408 /* C89 says implicit declarations are in the innermost block.
2409 So we record the decl in the standard fashion. */
2410 decl = pushdecl (decl);
2412 /* No need to call objc_check_decl here - it's a function type. */
2413 rest_of_decl_compilation (decl, 0, 0);
2415 /* Write a record describing this implicit function declaration
2416 to the prototypes file (if requested). */
2417 gen_aux_info_record (decl, 0, 1, 0);
2419 /* Possibly apply some default attributes to this implicit declaration. */
2420 decl_attributes (&decl, NULL_TREE, 0);
2425 /* Issue an error message for a reference to an undeclared variable
2426 ID, including a reference to a builtin outside of function-call
2427 context. Establish a binding of the identifier to error_mark_node
2428 in an appropriate scope, which will suppress further errors for the
2429 same identifier. The error message should be given location LOC. */
2431 undeclared_variable (tree id, location_t loc)
2433 static bool already = false;
2434 struct c_scope *scope;
2436 if (current_function_decl == 0)
2438 error ("%H%qE undeclared here (not in a function)", &loc, id);
2439 scope = current_scope;
2443 error ("%H%qE undeclared (first use in this function)", &loc, id);
2447 error ("%H(Each undeclared identifier is reported only once", &loc);
2448 error ("%Hfor each function it appears in.)", &loc);
2452 /* If we are parsing old-style parameter decls, current_function_decl
2453 will be nonnull but current_function_scope will be null. */
2454 scope = current_function_scope ? current_function_scope : current_scope;
2456 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false,
2460 /* Subroutine of lookup_label, declare_label, define_label: construct a
2461 LABEL_DECL with all the proper frills. */
2464 make_label (tree name, location_t location)
2466 tree label = build_decl (LABEL_DECL, name, void_type_node);
2468 DECL_CONTEXT (label) = current_function_decl;
2469 DECL_MODE (label) = VOIDmode;
2470 DECL_SOURCE_LOCATION (label) = location;
2475 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2476 Create one if none exists so far for the current function.
2477 This is called when a label is used in a goto expression or
2478 has its address taken. */
2481 lookup_label (tree name)
2485 if (current_function_decl == 0)
2487 error ("label %qE referenced outside of any function", name);
2491 /* Use a label already defined or ref'd with this name, but not if
2492 it is inherited from a containing function and wasn't declared
2494 label = I_LABEL_DECL (name);
2495 if (label && (DECL_CONTEXT (label) == current_function_decl
2496 || C_DECLARED_LABEL_FLAG (label)))
2498 /* If the label has only been declared, update its apparent
2499 location to point here, for better diagnostics if it
2500 turns out not to have been defined. */
2501 if (!TREE_USED (label))
2502 DECL_SOURCE_LOCATION (label) = input_location;
2506 /* No label binding for that identifier; make one. */
2507 label = make_label (name, input_location);
2509 /* Ordinary labels go in the current function scope. */
2510 bind (name, label, current_function_scope,
2511 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
2515 /* Make a label named NAME in the current function, shadowing silently
2516 any that may be inherited from containing functions or containing
2517 scopes. This is called for __label__ declarations. */
2520 declare_label (tree name)
2522 struct c_binding *b = I_LABEL_BINDING (name);
2525 /* Check to make sure that the label hasn't already been declared
2527 if (b && B_IN_CURRENT_SCOPE (b))
2529 error ("duplicate label declaration %qE", name);
2530 locate_old_decl (b->decl);
2532 /* Just use the previous declaration. */
2536 label = make_label (name, input_location);
2537 C_DECLARED_LABEL_FLAG (label) = 1;
2539 /* Declared labels go in the current scope. */
2540 bind (name, label, current_scope,
2541 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
2545 /* Define a label, specifying the location in the source file.
2546 Return the LABEL_DECL node for the label, if the definition is valid.
2547 Otherwise return 0. */
2550 define_label (location_t location, tree name)
2552 /* Find any preexisting label with this name. It is an error
2553 if that label has already been defined in this function, or
2554 if there is a containing function with a declared label with
2556 tree label = I_LABEL_DECL (name);
2557 struct c_label_list *nlist_se, *nlist_vm;
2560 && ((DECL_CONTEXT (label) == current_function_decl
2561 && DECL_INITIAL (label) != 0)
2562 || (DECL_CONTEXT (label) != current_function_decl
2563 && C_DECLARED_LABEL_FLAG (label))))
2565 error ("%Hduplicate label %qD", &location, label);
2566 locate_old_decl (label);
2569 else if (label && DECL_CONTEXT (label) == current_function_decl)
2571 /* The label has been used or declared already in this function,
2572 but not defined. Update its location to point to this
2574 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2575 error ("%Jjump into statement expression", label);
2576 if (C_DECL_UNDEFINABLE_VM (label))
2577 error ("%Jjump into scope of identifier with variably modified type",
2579 DECL_SOURCE_LOCATION (label) = location;
2583 /* No label binding for that identifier; make one. */
2584 label = make_label (name, location);
2586 /* Ordinary labels go in the current function scope. */
2587 bind (name, label, current_function_scope,
2588 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
2591 if (!in_system_header && lookup_name (name))
2592 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2593 "for labels, identifier %qE conflicts", &location, name);
2595 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2596 nlist_se->next = label_context_stack_se->labels_def;
2597 nlist_se->label = label;
2598 label_context_stack_se->labels_def = nlist_se;
2600 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2601 nlist_vm->next = label_context_stack_vm->labels_def;
2602 nlist_vm->label = label;
2603 label_context_stack_vm->labels_def = nlist_vm;
2605 /* Mark label as having been defined. */
2606 DECL_INITIAL (label) = error_mark_node;
2610 /* Given NAME, an IDENTIFIER_NODE,
2611 return the structure (or union or enum) definition for that name.
2612 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2613 CODE says which kind of type the caller wants;
2614 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2615 If the wrong kind of type is found, an error is reported. */
2618 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2620 struct c_binding *b = I_TAG_BINDING (name);
2626 /* We only care about whether it's in this level if
2627 thislevel_only was set or it might be a type clash. */
2628 if (thislevel_only || TREE_CODE (b->decl) != code)
2630 /* For our purposes, a tag in the external scope is the same as
2631 a tag in the file scope. (Primarily relevant to Objective-C
2632 and its builtin structure tags, which get pushed before the
2633 file scope is created.) */
2634 if (B_IN_CURRENT_SCOPE (b)
2635 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2639 if (thislevel_only && !thislevel)
2642 if (TREE_CODE (b->decl) != code)
2644 /* Definition isn't the kind we were looking for. */
2645 pending_invalid_xref = name;
2646 pending_invalid_xref_location = input_location;
2648 /* If in the same binding level as a declaration as a tag
2649 of a different type, this must not be allowed to
2650 shadow that tag, so give the error immediately.
2651 (For example, "struct foo; union foo;" is invalid.) */
2653 pending_xref_error ();
2658 /* Print an error message now
2659 for a recent invalid struct, union or enum cross reference.
2660 We don't print them immediately because they are not invalid
2661 when used in the `struct foo;' construct for shadowing. */
2664 pending_xref_error (void)
2666 if (pending_invalid_xref != 0)
2667 error ("%H%qE defined as wrong kind of tag",
2668 &pending_invalid_xref_location, pending_invalid_xref);
2669 pending_invalid_xref = 0;
2673 /* Look up NAME in the current scope and its superiors
2674 in the namespace of variables, functions and typedefs.
2675 Return a ..._DECL node of some kind representing its definition,
2676 or return 0 if it is undefined. */
2679 lookup_name (tree name)
2681 struct c_binding *b = I_SYMBOL_BINDING (name);
2682 if (b && !b->invisible)
2687 /* Similar to `lookup_name' but look only at the indicated scope. */
2690 lookup_name_in_scope (tree name, struct c_scope *scope)
2692 struct c_binding *b;
2694 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2695 if (B_IN_SCOPE (b, scope))
2700 /* Create the predefined scalar types of C,
2701 and some nodes representing standard constants (0, 1, (void *) 0).
2702 Initialize the global scope.
2703 Make definitions for built-in primitive functions. */
2706 c_init_decl_processing (void)
2708 location_t save_loc = input_location;
2710 /* Initialize reserved words for parser. */
2713 current_function_decl = 0;
2715 gcc_obstack_init (&parser_obstack);
2717 /* Make the externals scope. */
2719 external_scope = current_scope;
2721 /* Declarations from c_common_nodes_and_builtins must not be associated
2722 with this input file, lest we get differences between using and not
2723 using preprocessed headers. */
2724 input_location = BUILTINS_LOCATION;
2726 build_common_tree_nodes (flag_signed_char, false);
2728 c_common_nodes_and_builtins ();
2730 /* In C, comparisons and TRUTH_* expressions have type int. */
2731 truthvalue_type_node = integer_type_node;
2732 truthvalue_true_node = integer_one_node;
2733 truthvalue_false_node = integer_zero_node;
2735 /* Even in C99, which has a real boolean type. */
2736 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2737 boolean_type_node));
2739 input_location = save_loc;
2741 pedantic_lvalues = true;
2743 make_fname_decl = c_make_fname_decl;
2744 start_fname_decls ();
2747 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2748 decl, NAME is the initialization string and TYPE_DEP indicates whether
2749 NAME depended on the type of the function. As we don't yet implement
2750 delayed emission of static data, we mark the decl as emitted
2751 so it is not placed in the output. Anything using it must therefore pull
2752 out the STRING_CST initializer directly. FIXME. */
2755 c_make_fname_decl (tree id, int type_dep)
2757 const char *name = fname_as_string (type_dep);
2758 tree decl, type, init;
2759 size_t length = strlen (name);
2761 type = build_array_type (char_type_node,
2762 build_index_type (size_int (length)));
2763 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2765 decl = build_decl (VAR_DECL, id, type);
2767 TREE_STATIC (decl) = 1;
2768 TREE_READONLY (decl) = 1;
2769 DECL_ARTIFICIAL (decl) = 1;
2771 init = build_string (length + 1, name);
2772 free (CONST_CAST (char *, name));
2773 TREE_TYPE (init) = type;
2774 DECL_INITIAL (decl) = init;
2776 TREE_USED (decl) = 1;
2778 if (current_function_decl
2779 /* For invalid programs like this:
2782 const char* p = __FUNCTION__;
2784 the __FUNCTION__ is believed to appear in K&R style function
2785 parameter declarator. In that case we still don't have
2787 && (!errorcount || current_function_scope))
2789 DECL_CONTEXT (decl) = current_function_decl;
2790 bind (id, decl, current_function_scope,
2791 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
2794 finish_decl (decl, init, NULL_TREE);
2800 c_builtin_function (tree decl)
2802 tree type = TREE_TYPE (decl);
2803 tree id = DECL_NAME (decl);
2805 const char *name = IDENTIFIER_POINTER (id);
2806 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2808 /* Should never be called on a symbol with a preexisting meaning. */
2809 gcc_assert (!I_SYMBOL_BINDING (id));
2811 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false,
2814 /* Builtins in the implementation namespace are made visible without
2815 needing to be explicitly declared. See push_file_scope. */
2816 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2818 TREE_CHAIN (decl) = visible_builtins;
2819 visible_builtins = decl;
2826 c_builtin_function_ext_scope (tree decl)
2828 tree type = TREE_TYPE (decl);
2829 tree id = DECL_NAME (decl);
2831 const char *name = IDENTIFIER_POINTER (id);
2832 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2834 /* Should never be called on a symbol with a preexisting meaning. */
2835 gcc_assert (!I_SYMBOL_BINDING (id));
2837 bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false,
2840 /* Builtins in the implementation namespace are made visible without
2841 needing to be explicitly declared. See push_file_scope. */
2842 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2844 TREE_CHAIN (decl) = visible_builtins;
2845 visible_builtins = decl;
2851 /* Called when a declaration is seen that contains no names to declare.
2852 If its type is a reference to a structure, union or enum inherited
2853 from a containing scope, shadow that tag name for the current scope
2854 with a forward reference.
2855 If its type defines a new named structure or union
2856 or defines an enum, it is valid but we need not do anything here.
2857 Otherwise, it is an error. */
2860 shadow_tag (const struct c_declspecs *declspecs)
2862 shadow_tag_warned (declspecs, 0);
2865 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2868 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2870 bool found_tag = false;
2872 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2874 tree value = declspecs->type;
2875 enum tree_code code = TREE_CODE (value);
2877 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2878 /* Used to test also that TYPE_SIZE (value) != 0.
2879 That caused warning for `struct foo;' at top level in the file. */
2881 tree name = TYPE_NAME (value);
2886 if (declspecs->restrict_p)
2888 error ("invalid use of %<restrict%>");
2894 if (warned != 1 && code != ENUMERAL_TYPE)
2895 /* Empty unnamed enum OK */
2897 pedwarn (input_location, 0,
2898 "unnamed struct/union that defines no instances");
2902 else if (!declspecs->tag_defined_p
2903 && declspecs->storage_class != csc_none)
2906 pedwarn (input_location, 0,
2907 "empty declaration with storage class specifier "
2908 "does not redeclare tag");
2910 pending_xref_error ();
2912 else if (!declspecs->tag_defined_p
2913 && (declspecs->const_p
2914 || declspecs->volatile_p
2915 || declspecs->restrict_p))
2918 pedwarn (input_location, 0,
2919 "empty declaration with type qualifier "
2920 "does not redeclare tag");
2922 pending_xref_error ();
2926 pending_invalid_xref = 0;
2927 t = lookup_tag (code, name, 1);
2931 t = make_node (code);
2938 if (warned != 1 && !in_system_header)
2940 pedwarn (input_location, 0,
2941 "useless type name in empty declaration");
2946 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2948 pedwarn (input_location, 0, "useless type name in empty declaration");
2952 pending_invalid_xref = 0;
2954 if (declspecs->inline_p)
2956 error ("%<inline%> in empty declaration");
2960 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2962 error ("%<auto%> in file-scope empty declaration");
2966 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2968 error ("%<register%> in file-scope empty declaration");
2972 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2974 warning (0, "useless storage class specifier in empty declaration");
2978 if (!warned && !in_system_header && declspecs->thread_p)
2980 warning (0, "useless %<__thread%> in empty declaration");
2984 if (!warned && !in_system_header && (declspecs->const_p
2985 || declspecs->volatile_p
2986 || declspecs->restrict_p))
2988 warning (0, "useless type qualifier in empty declaration");
2995 pedwarn (input_location, 0, "empty declaration");
3000 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3001 bits. SPECS represents declaration specifiers that the grammar
3002 only permits to contain type qualifiers and attributes. */
3005 quals_from_declspecs (const struct c_declspecs *specs)
3007 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3008 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3009 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
3010 gcc_assert (!specs->type
3011 && !specs->decl_attr
3012 && specs->typespec_word == cts_none
3013 && specs->storage_class == csc_none
3014 && !specs->typedef_p
3015 && !specs->explicit_signed_p
3016 && !specs->deprecated_p
3018 && !specs->long_long_p
3021 && !specs->unsigned_p
3022 && !specs->complex_p
3024 && !specs->thread_p);
3028 /* Construct an array declarator. EXPR is the expression inside [],
3029 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3030 applied to the pointer to which a parameter array is converted).
3031 STATIC_P is true if "static" is inside the [], false otherwise.
3032 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3033 length which is nevertheless a complete type, false otherwise. The
3034 field for the contained declarator is left to be filled in by
3035 set_array_declarator_inner. */
3037 struct c_declarator *
3038 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3041 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3042 struct c_declarator);
3043 declarator->kind = cdk_array;
3044 declarator->declarator = 0;
3045 declarator->u.array.dimen = expr;
3048 declarator->u.array.attrs = quals->attrs;
3049 declarator->u.array.quals = quals_from_declspecs (quals);
3053 declarator->u.array.attrs = NULL_TREE;
3054 declarator->u.array.quals = 0;
3056 declarator->u.array.static_p = static_p;
3057 declarator->u.array.vla_unspec_p = vla_unspec_p;
3060 if (static_p || quals != NULL)
3061 pedwarn (input_location, OPT_pedantic,
3062 "ISO C90 does not support %<static%> or type "
3063 "qualifiers in parameter array declarators");
3065 pedwarn (input_location, OPT_pedantic,
3066 "ISO C90 does not support %<[*]%> array declarators");
3070 if (!current_scope->parm_flag)
3073 error ("%<[*]%> not allowed in other than function prototype scope");
3074 declarator->u.array.vla_unspec_p = false;
3077 current_scope->had_vla_unspec = true;
3082 /* Set the contained declarator of an array declarator. DECL is the
3083 declarator, as constructed by build_array_declarator; INNER is what
3084 appears on the left of the []. */
3086 struct c_declarator *
3087 set_array_declarator_inner (struct c_declarator *decl,
3088 struct c_declarator *inner)
3090 decl->declarator = inner;
3094 /* INIT is a constructor that forms DECL's initializer. If the final
3095 element initializes a flexible array field, add the size of that
3096 initializer to DECL's size. */
3099 add_flexible_array_elts_to_size (tree decl, tree init)
3103 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3106 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3107 type = TREE_TYPE (elt);
3108 if (TREE_CODE (type) == ARRAY_TYPE
3109 && TYPE_SIZE (type) == NULL_TREE
3110 && TYPE_DOMAIN (type) != NULL_TREE
3111 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3113 complete_array_type (&type, elt, false);
3115 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3116 DECL_SIZE_UNIT (decl)
3117 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3121 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3122 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3123 before the type name, and set *EXPR_CONST_OPERANDS, if
3124 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3125 appear in a constant expression. */
3128 groktypename (struct c_type_name *type_name, tree *expr,
3129 bool *expr_const_operands)
3132 tree attrs = type_name->specs->attrs;
3134 type_name->specs->attrs = NULL_TREE;
3136 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3137 false, NULL, &attrs, expr, expr_const_operands,
3140 /* Apply attributes. */
3141 decl_attributes (&type, attrs, 0);
3146 /* Decode a declarator in an ordinary declaration or data definition.
3147 This is called as soon as the type information and variable name
3148 have been parsed, before parsing the initializer if any.
3149 Here we create the ..._DECL node, fill in its type,
3150 and put it on the list of decls for the current context.
3151 The ..._DECL node is returned as the value.
3153 Exception: for arrays where the length is not specified,
3154 the type is left null, to be filled in by `finish_decl'.
3156 Function definitions do not come here; they go to start_function
3157 instead. However, external and forward declarations of functions
3158 do go through here. Structure field declarations are done by
3159 grokfield and not through here. */
3162 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3163 bool initialized, tree attributes)
3167 tree expr = NULL_TREE;
3168 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
3170 /* An object declared as __attribute__((deprecated)) suppresses
3171 warnings of uses of other deprecated items. */
3172 if (lookup_attribute ("deprecated", attributes))
3173 deprecated_state = DEPRECATED_SUPPRESS;
3175 decl = grokdeclarator (declarator, declspecs,
3176 NORMAL, initialized, NULL, &attributes, &expr, NULL,
3184 if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)))
3185 warning (OPT_Wmain, "%q+D is usually a function", decl);
3188 /* Is it valid for this decl to have an initializer at all?
3189 If not, set INITIALIZED to zero, which will indirectly
3190 tell 'finish_decl' to ignore the initializer once it is parsed. */
3191 switch (TREE_CODE (decl))
3194 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3199 error ("function %qD is initialized like a variable", decl);
3204 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3205 error ("parameter %qD is initialized", decl);
3210 /* Don't allow initializations for incomplete types except for
3211 arrays which might be completed by the initialization. */
3213 /* This can happen if the array size is an undefined macro.
3214 We already gave a warning, so we don't need another one. */
3215 if (TREE_TYPE (decl) == error_mark_node)
3217 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3219 /* A complete type is ok if size is fixed. */
3221 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3222 || C_DECL_VARIABLE_SIZE (decl))
3224 error ("variable-sized object may not be initialized");
3228 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3230 error ("variable %qD has initializer but incomplete type", decl);
3233 else if (C_DECL_VARIABLE_SIZE (decl))
3235 /* Although C99 is unclear about whether incomplete arrays
3236 of VLAs themselves count as VLAs, it does not make
3237 sense to permit them to be initialized given that
3238 ordinary VLAs may not be initialized. */
3239 error ("variable-sized object may not be initialized");
3246 if (current_scope == file_scope)
3247 TREE_STATIC (decl) = 1;
3249 /* Tell 'pushdecl' this is an initialized decl
3250 even though we don't yet have the initializer expression.
3251 Also tell 'finish_decl' it may store the real initializer. */
3252 DECL_INITIAL (decl) = error_mark_node;
3255 /* If this is a function declaration, write a record describing it to the
3256 prototypes file (if requested). */
3258 if (TREE_CODE (decl) == FUNCTION_DECL)
3259 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3261 /* ANSI specifies that a tentative definition which is not merged with
3262 a non-tentative definition behaves exactly like a definition with an
3263 initializer equal to zero. (Section 3.7.2)
3265 -fno-common gives strict ANSI behavior, though this tends to break
3266 a large body of code that grew up without this rule.
3268 Thread-local variables are never common, since there's no entrenched
3269 body of code to break, and it allows more efficient variable references
3270 in the presence of dynamic linking. */
3272 if (TREE_CODE (decl) == VAR_DECL
3274 && TREE_PUBLIC (decl)
3275 && !DECL_THREAD_LOCAL_P (decl)
3277 DECL_COMMON (decl) = 1;
3279 /* Set attributes here so if duplicate decl, will have proper attributes. */
3280 decl_attributes (&decl, attributes, 0);
3282 /* Handle gnu_inline attribute. */
3283 if (declspecs->inline_p
3284 && !flag_gnu89_inline
3285 && TREE_CODE (decl) == FUNCTION_DECL
3286 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
3287 || current_function_decl))
3289 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
3291 else if (declspecs->storage_class != csc_static)
3292 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
3295 if (TREE_CODE (decl) == FUNCTION_DECL
3296 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3298 struct c_declarator *ce = declarator;
3300 if (ce->kind == cdk_pointer)
3301 ce = declarator->declarator;
3302 if (ce->kind == cdk_function)
3304 tree args = ce->u.arg_info->parms;
3305 for (; args; args = TREE_CHAIN (args))
3307 tree type = TREE_TYPE (args);
3308 if (type && INTEGRAL_TYPE_P (type)
3309 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3310 DECL_ARG_TYPE (args) = integer_type_node;
3315 if (TREE_CODE (decl) == FUNCTION_DECL
3316 && DECL_DECLARED_INLINE_P (decl)
3317 && DECL_UNINLINABLE (decl)
3318 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3319 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3322 /* C99 6.7.4p3: An inline definition of a function with external
3323 linkage shall not contain a definition of a modifiable object
3324 with static storage duration... */
3325 if (TREE_CODE (decl) == VAR_DECL
3326 && current_scope != file_scope
3327 && TREE_STATIC (decl)
3328 && !TREE_READONLY (decl)
3329 && DECL_DECLARED_INLINE_P (current_function_decl)
3330 && DECL_EXTERNAL (current_function_decl))
3331 pedwarn (input_location, 0,
3332 "%q+D is static but declared in inline function %qD "
3333 "which is not static", decl, current_function_decl);
3335 /* Add this decl to the current scope.
3336 TEM may equal DECL or it may be a previous decl of the same name. */
3337 tem = pushdecl (decl);
3339 if (initialized && DECL_EXTERNAL (tem))
3341 DECL_EXTERNAL (tem) = 0;
3342 TREE_STATIC (tem) = 1;
3348 /* Initialize EH if not initialized yet and exceptions are enabled. */
3351 c_maybe_initialize_eh (void)
3353 if (!flag_exceptions || c_eh_initialized_p)
3356 c_eh_initialized_p = true;
3357 eh_personality_libfunc
3358 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3359 ? "__gcc_personality_sj0"
3360 : "__gcc_personality_v0");
3361 default_init_unwind_resume_libfunc ();
3362 using_eh_for_cleanups ();
3365 /* Finish processing of a declaration;
3366 install its initial value.
3367 If the length of an array type is not known before,
3368 it must be determined now, from the initial value, or it is an error. */
3371 finish_decl (tree decl, tree init, tree asmspec_tree)
3374 int was_incomplete = (DECL_SIZE (decl) == 0);
3375 const char *asmspec = 0;
3377 /* If a name was specified, get the string. */
3378 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3379 && DECL_FILE_SCOPE_P (decl))
3380 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3382 asmspec = TREE_STRING_POINTER (asmspec_tree);
3384 /* If `start_decl' didn't like having an initialization, ignore it now. */
3385 if (init != 0 && DECL_INITIAL (decl) == 0)
3388 /* Don't crash if parm is initialized. */
3389 if (TREE_CODE (decl) == PARM_DECL)
3393 store_init_value (decl, init);
3395 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3396 || TREE_CODE (decl) == FUNCTION_DECL
3397 || TREE_CODE (decl) == FIELD_DECL))
3398 objc_check_decl (decl);
3400 type = TREE_TYPE (decl);
3402 /* Deduce size of array from initialization, if not already known. */
3403 if (TREE_CODE (type) == ARRAY_TYPE
3404 && TYPE_DOMAIN (type) == 0
3405 && TREE_CODE (decl) != TYPE_DECL)
3408 = (TREE_STATIC (decl)
3409 /* Even if pedantic, an external linkage array
3410 may have incomplete type at first. */
3411 ? pedantic && !TREE_PUBLIC (decl)
3412 : !DECL_EXTERNAL (decl));
3414 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3417 /* Get the completed type made by complete_array_type. */
3418 type = TREE_TYPE (decl);
3423 error ("initializer fails to determine size of %q+D", decl);
3428 error ("array size missing in %q+D", decl);
3429 /* If a `static' var's size isn't known,
3430 make it extern as well as static, so it does not get
3432 If it is not `static', then do not mark extern;
3433 finish_incomplete_decl will give it a default size
3434 and it will get allocated. */
3435 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3436 DECL_EXTERNAL (decl) = 1;
3440 error ("zero or negative size array %q+D", decl);
3444 /* For global variables, update the copy of the type that
3445 exists in the binding. */
3446 if (TREE_PUBLIC (decl))
3448 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3449 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3450 b_ext = b_ext->shadowed;
3454 b_ext->type = composite_type (b_ext->type, type);
3465 if (DECL_INITIAL (decl))
3466 TREE_TYPE (DECL_INITIAL (decl)) = type;
3468 layout_decl (decl, 0);
3471 if (TREE_CODE (decl) == VAR_DECL)
3473 if (init && TREE_CODE (init) == CONSTRUCTOR)
3474 add_flexible_array_elts_to_size (decl, init);
3476 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3477 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3478 layout_decl (decl, 0);
3480 if (DECL_SIZE (decl) == 0
3481 /* Don't give an error if we already gave one earlier. */
3482 && TREE_TYPE (decl) != error_mark_node
3483 && (TREE_STATIC (decl)
3484 /* A static variable with an incomplete type
3485 is an error if it is initialized.
3486 Also if it is not file scope.
3487 Otherwise, let it through, but if it is not `extern'
3488 then it may cause an error message later. */
3489 ? (DECL_INITIAL (decl) != 0
3490 || !DECL_FILE_SCOPE_P (decl))
3491 /* An automatic variable with an incomplete type
3493 : !DECL_EXTERNAL (decl)))
3495 error ("storage size of %q+D isn%'t known", decl);
3496 TREE_TYPE (decl) = error_mark_node;
3499 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3500 && DECL_SIZE (decl) != 0)
3502 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3503 constant_expression_warning (DECL_SIZE (decl));
3506 error ("storage size of %q+D isn%'t constant", decl);
3507 TREE_TYPE (decl) = error_mark_node;
3511 if (TREE_USED (type))
3512 TREE_USED (decl) = 1;
3515 /* If this is a function and an assembler name is specified, reset DECL_RTL
3516 so we can give it its new name. Also, update built_in_decls if it
3517 was a normal built-in. */
3518 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3520 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3521 set_builtin_user_assembler_name (decl, asmspec);
3522 set_user_assembler_name (decl, asmspec);
3525 /* If #pragma weak was used, mark the decl weak now. */
3526 maybe_apply_pragma_weak (decl);
3528 /* Output the assembler code and/or RTL code for variables and functions,
3529 unless the type is an undefined structure or union.
3530 If not, it will get done when the type is completed. */
3532 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3534 /* Determine the ELF visibility. */
3535 if (TREE_PUBLIC (decl))
3536 c_determine_visibility (decl);
3538 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3539 if (c_dialect_objc ())
3540 objc_check_decl (decl);
3544 /* If this is not a static variable, issue a warning.
3545 It doesn't make any sense to give an ASMSPEC for an
3546 ordinary, non-register local variable. Historically,
3547 GCC has accepted -- but ignored -- the ASMSPEC in
3549 if (!DECL_FILE_SCOPE_P (decl)
3550 && TREE_CODE (decl) == VAR_DECL
3551 && !C_DECL_REGISTER (decl)
3552 && !TREE_STATIC (decl))
3553 warning (0, "ignoring asm-specifier for non-static local "
3554 "variable %q+D", decl);
3556 set_user_assembler_name (decl, asmspec);
3559 if (DECL_FILE_SCOPE_P (decl))
3561 if (DECL_INITIAL (decl) == NULL_TREE
3562 || DECL_INITIAL (decl) == error_mark_node)
3563 /* Don't output anything
3564 when a tentative file-scope definition is seen.
3565 But at end of compilation, do output code for them. */
3566 DECL_DEFER_OUTPUT (decl) = 1;
3567 rest_of_decl_compilation (decl, true, 0);
3571 /* In conjunction with an ASMSPEC, the `register'
3572 keyword indicates that we should place the variable
3573 in a particular register. */
3574 if (asmspec && C_DECL_REGISTER (decl))
3576 DECL_HARD_REGISTER (decl) = 1;
3577 /* This cannot be done for a structure with volatile
3578 fields, on which DECL_REGISTER will have been
3580 if (!DECL_REGISTER (decl))
3581 error ("cannot put object with volatile field into register");
3584 if (TREE_CODE (decl) != FUNCTION_DECL)
3586 /* If we're building a variable sized type, and we might be
3587 reachable other than via the top of the current binding
3588 level, then create a new BIND_EXPR so that we deallocate
3589 the object at the right time. */
3590 /* Note that DECL_SIZE can be null due to errors. */
3591 if (DECL_SIZE (decl)
3592 && !TREE_CONSTANT (DECL_SIZE (decl))
3593 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3596 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3597 TREE_SIDE_EFFECTS (bind) = 1;
3599 BIND_EXPR_BODY (bind) = push_stmt_list ();
3601 add_stmt (build_stmt (DECL_EXPR, decl));
3606 if (!DECL_FILE_SCOPE_P (decl))
3608 /* Recompute the RTL of a local array now
3609 if it used to be an incomplete type. */
3611 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3613 /* If we used it already as memory, it must stay in memory. */
3614 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3615 /* If it's still incomplete now, no init will save it. */
3616 if (DECL_SIZE (decl) == 0)
3617 DECL_INITIAL (decl) = 0;
3622 if (TREE_CODE (decl) == TYPE_DECL)
3624 if (!DECL_FILE_SCOPE_P (decl)
3625 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3626 add_stmt (build_stmt (DECL_EXPR, decl));
3628 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3631 /* At the end of a declaration, throw away any variable type sizes
3632 of types defined inside that declaration. There is no use
3633 computing them in the following function definition. */
3634 if (current_scope == file_scope)
3635 get_pending_sizes ();
3637 /* Install a cleanup (aka destructor) if one was given. */
3638 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3640 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3643 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3644 tree cleanup_decl = lookup_name (cleanup_id);
3647 /* Build "cleanup(&decl)" for the destructor. */
3648 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
3649 cleanup = build_tree_list (NULL_TREE, cleanup);
3650 cleanup = build_function_call (cleanup_decl, cleanup);
3652 /* Don't warn about decl unused; the cleanup uses it. */
3653 TREE_USED (decl) = 1;
3654 TREE_USED (cleanup_decl) = 1;
3656 /* Initialize EH, if we've been told to do so. */
3657 c_maybe_initialize_eh ();
3659 push_cleanup (decl, cleanup, false);
3664 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3667 grokparm (const struct c_parm *parm)
3669 tree attrs = parm->attrs;
3670 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3671 NULL, &attrs, NULL, NULL, DEPRECATED_NORMAL);
3673 decl_attributes (&decl, attrs, 0);
3678 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3679 and push that on the current scope. */
3682 push_parm_decl (const struct c_parm *parm)
3684 tree attrs = parm->attrs;
3687 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
3688 &attrs, NULL, NULL, DEPRECATED_NORMAL);
3689 decl_attributes (&decl, attrs, 0);
3691 decl = pushdecl (decl);
3693 finish_decl (decl, NULL_TREE, NULL_TREE);
3696 /* Mark all the parameter declarations to date as forward decls.
3697 Also diagnose use of this extension. */
3700 mark_forward_parm_decls (void)
3702 struct c_binding *b;
3704 if (pedantic && !current_scope->warned_forward_parm_decls)
3706 pedwarn (input_location, OPT_pedantic,
3707 "ISO C forbids forward parameter declarations");
3708 current_scope->warned_forward_parm_decls = true;
3711 for (b = current_scope->bindings; b; b = b->prev)
3712 if (TREE_CODE (b->decl) == PARM_DECL)
3713 TREE_ASM_WRITTEN (b->decl) = 1;
3716 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3717 literal, which may be an incomplete array type completed by the
3718 initializer; INIT is a CONSTRUCTOR that initializes the compound
3719 literal. NON_CONST is true if the initializers contain something
3720 that cannot occur in a constant expression. */
3723 build_compound_literal (tree type, tree init, bool non_const)
3725 /* We do not use start_decl here because we have a type, not a declarator;
3726 and do not use finish_decl because the decl should be stored inside
3727 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3732 if (type == error_mark_node)
3733 return error_mark_node;
3735 decl = build_decl (VAR_DECL, NULL_TREE, type);
3736 DECL_EXTERNAL (decl) = 0;
3737 TREE_PUBLIC (decl) = 0;
3738 TREE_STATIC (decl) = (current_scope == file_scope);
3739 DECL_CONTEXT (decl) = current_function_decl;
3740 TREE_USED (decl) = 1;
3741 TREE_TYPE (decl) = type;
3742 TREE_READONLY (decl) = TYPE_READONLY (type);
3743 store_init_value (decl, init);
3745 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3747 int failure = complete_array_type (&TREE_TYPE (decl),
3748 DECL_INITIAL (decl), true);
3749 gcc_assert (!failure);
3751 type = TREE_TYPE (decl);
3752 TREE_TYPE (DECL_INITIAL (decl)) = type;
3755 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3756 return error_mark_node;
3758 stmt = build_stmt (DECL_EXPR, decl);
3759 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3760 TREE_SIDE_EFFECTS (complit) = 1;
3762 layout_decl (decl, 0);
3764 if (TREE_STATIC (decl))
3766 /* This decl needs a name for the assembler output. */
3767 set_compound_literal_name (decl);
3768 DECL_DEFER_OUTPUT (decl) = 1;
3769 DECL_COMDAT (decl) = 1;
3770 DECL_ARTIFICIAL (decl) = 1;
3771 DECL_IGNORED_P (decl) = 1;
3773 rest_of_decl_compilation (decl, 1, 0);
3778 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
3779 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
3785 /* Determine whether TYPE is a structure with a flexible array member,
3786 or a union containing such a structure (possibly recursively). */
3789 flexible_array_type_p (tree type)
3792 switch (TREE_CODE (type))
3795 x = TYPE_FIELDS (type);
3798 while (TREE_CHAIN (x) != NULL_TREE)
3800 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3801 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3802 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3803 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3807 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3809 if (flexible_array_type_p (TREE_TYPE (x)))
3818 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3819 replacing with appropriate values if they are invalid. */
3821 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3824 unsigned int max_width;
3825 unsigned HOST_WIDE_INT w;
3826 const char *name = orig_name ? orig_name: _("<anonymous>");
3828 /* Detect and ignore out of range field width and process valid
3830 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3831 || TREE_CODE (*width) != INTEGER_CST)
3833 error ("bit-field %qs width not an integer constant", name);
3834 *width = integer_one_node;
3838 constant_expression_warning (*width);
3839 if (tree_int_cst_sgn (*width) < 0)
3841 error ("negative width in bit-field %qs", name);
3842 *width = integer_one_node;
3844 else if (integer_zerop (*width) && orig_name)
3846 error ("zero width for bit-field %qs", name);
3847 *width = integer_one_node;
3851 /* Detect invalid bit-field type. */
3852 if (TREE_CODE (*type) != INTEGER_TYPE
3853 && TREE_CODE (*type) != BOOLEAN_TYPE
3854 && TREE_CODE (*type) != ENUMERAL_TYPE)
3856 error ("bit-field %qs has invalid type", name);
3857 *type = unsigned_type_node;
3860 type_mv = TYPE_MAIN_VARIANT (*type);
3861 if (!in_system_header
3862 && type_mv != integer_type_node
3863 && type_mv != unsigned_type_node
3864 && type_mv != boolean_type_node)
3865 pedwarn (input_location, OPT_pedantic,
3866 "type of bit-field %qs is a GCC extension", name);
3868 max_width = TYPE_PRECISION (*type);
3870 if (0 < compare_tree_int (*width, max_width))
3872 error ("width of %qs exceeds its type", name);
3874 *width = build_int_cst (NULL_TREE, w);
3877 w = tree_low_cst (*width, 1);
3879 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3881 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3883 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3884 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3885 warning (0, "%qs is narrower than values of its type", name);
3891 /* Print warning about variable length array if necessary. */
3894 warn_variable_length_array (const char *name, tree size)
3896 int const_size = TREE_CONSTANT (size);
3898 if (!flag_isoc99 && pedantic && warn_vla != 0)
3903 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array %qs whose size "
3904 "can%'t be evaluated",
3907 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size "
3908 "can%'t be evaluated");
3913 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array %qs",
3916 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array");
3919 else if (warn_vla > 0)
3925 "the size of array %qs can"
3926 "%'t be evaluated", name);
3929 "the size of array can %'t be evaluated");
3935 "variable length array %qs is used",
3939 "variable length array is used");
3944 /* Given declspecs and a declarator,
3945 determine the name and type of the object declared
3946 and construct a ..._DECL node for it.
3947 (In one case we can return a ..._TYPE node instead.
3948 For invalid input we sometimes return 0.)
3950 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3952 DECL_CONTEXT says which syntactic context this declaration is in:
3953 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3954 FUNCDEF for a function definition. Like NORMAL but a few different
3955 error messages in each case. Return value may be zero meaning
3956 this definition is too screwy to try to parse.
3957 PARM for a parameter declaration (either within a function prototype
3958 or before a function body). Make a PARM_DECL, or return void_type_node.
3959 TYPENAME if for a typename (in a cast or sizeof).
3960 Don't make a DECL node; just return the ..._TYPE node.
3961 FIELD for a struct or union field; make a FIELD_DECL.
3962 INITIALIZED is true if the decl has an initializer.
3963 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3964 representing the width of the bit-field.
3965 DECL_ATTRS points to the list of attributes that should be added to this
3966 decl. Any nested attributes that belong on the decl itself will be
3968 If EXPR is not NULL, any expressions that need to be evaluated as
3969 part of evaluating variably modified types will be stored in *EXPR.
3970 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
3971 set to indicate whether operands in *EXPR can be used in constant
3973 DEPRECATED_STATE is a deprecated_states value indicating whether
3974 deprecation warnings should be suppressed.
3976 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3977 It may also be so in the PARM case, for a prototype where the
3978 argument type is specified but not the name.
3980 This function is where the complicated C meanings of `static'
3981 and `extern' are interpreted. */
3984 grokdeclarator (const struct c_declarator *declarator,
3985 struct c_declspecs *declspecs,
3986 enum decl_context decl_context, bool initialized, tree *width,
3987 tree *decl_attrs, tree *expr, bool *expr_const_operands,
3988 enum deprecated_states deprecated_state)
3990 tree type = declspecs->type;
3991 bool threadp = declspecs->thread_p;
3992 enum c_storage_class storage_class = declspecs->storage_class;
3996 int type_quals = TYPE_UNQUALIFIED;
3997 const char *name, *orig_name;
3998 bool funcdef_flag = false;
3999 bool funcdef_syntax = false;
4000 int size_varies = 0;
4001 tree decl_attr = declspecs->decl_attr;
4002 int array_ptr_quals = TYPE_UNQUALIFIED;
4003 tree array_ptr_attrs = NULL_TREE;
4004 int array_parm_static = 0;
4005 bool array_parm_vla_unspec_p = false;
4006 tree returned_attrs = NULL_TREE;
4007 bool bitfield = width != NULL;
4009 struct c_arg_info *arg_info = 0;
4011 bool expr_const_operands_dummy;
4015 if (expr_const_operands == NULL)
4016 expr_const_operands = &expr_const_operands_dummy;
4018 *expr = declspecs->expr;
4019 *expr_const_operands = declspecs->expr_const_operands;
4021 if (decl_context == FUNCDEF)
4022 funcdef_flag = true, decl_context = NORMAL;
4024 /* Look inside a declarator for the name being declared
4025 and get it as a string, for an error message. */
4027 const struct c_declarator *decl = declarator;
4036 funcdef_syntax = (decl->kind == cdk_function);
4037 decl = decl->declarator;
4041 decl = decl->declarator;
4046 name = IDENTIFIER_POINTER (decl->u.id);
4058 /* A function definition's declarator must have the form of
4059 a function declarator. */
4061 if (funcdef_flag && !funcdef_syntax)
4064 /* If this looks like a function definition, make it one,
4065 even if it occurs where parms are expected.
4066 Then store_parm_decls will reject it and not use it as a parm. */
4067 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4068 decl_context = PARM;
4070 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4071 warn_deprecated_use (declspecs->type);
4073 if ((decl_context == NORMAL || decl_context == FIELD)
4074 && current_scope == file_scope
4075 && variably_modified_type_p (type, NULL_TREE))
4077 error ("variably modified %qs at file scope", name);
4078 type = integer_type_node;
4081 size_varies = C_TYPE_VARIABLE_SIZE (type);
4083 /* Diagnose defaulting to "int". */
4085 if (declspecs->default_int_p && !in_system_header)
4087 /* Issue a warning if this is an ISO C 99 program or if
4088 -Wreturn-type and this is a function, or if -Wimplicit;
4089 prefer the former warning since it is more explicit. */
4090 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4092 warn_about_return_type = 1;
4094 pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int,
4095 "type defaults to %<int%> in declaration of %qs", name);
4098 /* Adjust the type if a bit-field is being declared,
4099 -funsigned-bitfields applied and the type is not explicitly
4101 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4102 && TREE_CODE (type) == INTEGER_TYPE)
4103 type = unsigned_type_for (type);
4105 /* Figure out the type qualifiers for the declaration. There are
4106 two ways a declaration can become qualified. One is something
4107 like `const int i' where the `const' is explicit. Another is
4108 something like `typedef const int CI; CI i' where the type of the
4109 declaration contains the `const'. A third possibility is that
4110 there is a type qualifier on the element type of a typedefed
4111 array type, in which case we should extract that qualifier so
4112 that c_apply_type_quals_to_decl receives the full list of
4113 qualifiers to work with (C90 is not entirely clear about whether
4114 duplicate qualifiers should be diagnosed in this case, but it
4115 seems most appropriate to do so). */
4116 element_type = strip_array_types (type);
4117 constp = declspecs->const_p + TYPE_READONLY (element_type);
4118 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4119 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4120 if (pedantic && !flag_isoc99)
4123 pedwarn (input_location, OPT_pedantic, "duplicate %<const%>");
4125 pedwarn (input_location, OPT_pedantic, "duplicate %<restrict%>");
4127 pedwarn (input_location, OPT_pedantic, "duplicate %<volatile%>");
4129 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4130 type = TYPE_MAIN_VARIANT (type);
4131 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4132 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4133 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4135 /* Warn about storage classes that are invalid for certain
4136 kinds of declarations (parameters, typenames, etc.). */
4140 || storage_class == csc_auto
4141 || storage_class == csc_register
4142 || storage_class == csc_typedef))
4144 if (storage_class == csc_auto)
4145 pedwarn (input_location,
4146 (current_scope == file_scope) ? 0 : OPT_pedantic,
4147 "function definition declared %<auto%>");
4148 if (storage_class == csc_register)
4149 error ("function definition declared %<register%>");
4150 if (storage_class == csc_typedef)
4151 error ("function definition declared %<typedef%>");
4153 error ("function definition declared %<__thread%>");
4155 if (storage_class == csc_auto
4156 || storage_class == csc_register
4157 || storage_class == csc_typedef)
4158 storage_class = csc_none;
4160 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4162 if (decl_context == PARM && storage_class == csc_register)
4166 switch (decl_context)
4169 error ("storage class specified for structure field %qs",
4173 error ("storage class specified for parameter %qs", name);
4176 error ("storage class specified for typename");
4179 storage_class = csc_none;
4183 else if (storage_class == csc_extern
4187 /* 'extern' with initialization is invalid if not at file scope. */
4188 if (current_scope == file_scope)
4190 /* It is fine to have 'extern const' when compiling at C
4191 and C++ intersection. */
4192 if (!(warn_cxx_compat && constp))
4193 warning (0, "%qs initialized and declared %<extern%>", name);
4196 error ("%qs has both %<extern%> and initializer", name);
4198 else if (current_scope == file_scope)
4200 if (storage_class == csc_auto)
4201 error ("file-scope declaration of %qs specifies %<auto%>", name);
4202 if (pedantic && storage_class == csc_register)
4203 pedwarn (input_location, OPT_pedantic,
4204 "file-scope declaration of %qs specifies %<register%>", name);
4208 if (storage_class == csc_extern && funcdef_flag)
4209 error ("nested function %qs declared %<extern%>", name);
4210 else if (threadp && storage_class == csc_none)
4212 error ("function-scope %qs implicitly auto and declared "
4219 /* Now figure out the structure of the declarator proper.
4220 Descend through it, creating more complex types, until we reach
4221 the declared identifier (or NULL_TREE, in an absolute declarator).
4222 At each stage we maintain an unqualified version of the type
4223 together with any qualifiers that should be applied to it with
4224 c_build_qualified_type; this way, array types including
4225 multidimensional array types are first built up in unqualified
4226 form and then the qualified form is created with
4227 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4229 while (declarator && declarator->kind != cdk_id)
4231 if (type == error_mark_node)
4233 declarator = declarator->declarator;
4237 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4238 a cdk_pointer (for *...),
4239 a cdk_function (for ...(...)),
4240 a cdk_attrs (for nested attributes),
4241 or a cdk_id (for the name being declared
4242 or the place in an absolute declarator
4243 where the name was omitted).
4244 For the last case, we have just exited the loop.
4246 At this point, TYPE is the type of elements of an array,
4247 or for a function to return, or for a pointer to point to.
4248 After this sequence of ifs, TYPE is the type of the
4249 array or function or pointer, and DECLARATOR has had its
4250 outermost layer removed. */
4252 if (array_ptr_quals != TYPE_UNQUALIFIED
4253 || array_ptr_attrs != NULL_TREE
4254 || array_parm_static)
4256 /* Only the innermost declarator (making a parameter be of
4257 array type which is converted to pointer type)
4258 may have static or type qualifiers. */
4259 error ("static or type qualifiers in non-parameter array declarator");
4260 array_ptr_quals = TYPE_UNQUALIFIED;
4261 array_ptr_attrs = NULL_TREE;
4262 array_parm_static = 0;
4265 switch (declarator->kind)
4269 /* A declarator with embedded attributes. */
4270 tree attrs = declarator->u.attrs;
4271 const struct c_declarator *inner_decl;
4273 declarator = declarator->declarator;
4274 inner_decl = declarator;
4275 while (inner_decl->kind == cdk_attrs)
4276 inner_decl = inner_decl->declarator;
4277 if (inner_decl->kind == cdk_id)
4278 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4279 else if (inner_decl->kind == cdk_function)
4280 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4281 else if (inner_decl->kind == cdk_array)
4282 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4283 returned_attrs = decl_attributes (&type,
4284 chainon (returned_attrs, attrs),
4290 tree itype = NULL_TREE;
4291 tree size = declarator->u.array.dimen;
4292 /* The index is a signed object `sizetype' bits wide. */
4293 tree index_type = c_common_signed_type (sizetype);
4295 array_ptr_quals = declarator->u.array.quals;
4296 array_ptr_attrs = declarator->u.array.attrs;
4297 array_parm_static = declarator->u.array.static_p;
4298 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
4300 declarator = declarator->declarator;
4302 /* Check for some types that there cannot be arrays of. */
4304 if (VOID_TYPE_P (type))
4306 error ("declaration of %qs as array of voids", name);
4307 type = error_mark_node;
4310 if (TREE_CODE (type) == FUNCTION_TYPE)
4312 error ("declaration of %qs as array of functions", name);
4313 type = error_mark_node;
4316 if (pedantic && !in_system_header && flexible_array_type_p (type))
4317 pedwarn (input_location, OPT_pedantic,
4318 "invalid use of structure with flexible array member");
4320 if (size == error_mark_node)
4321 type = error_mark_node;
4323 if (type == error_mark_node)
4326 /* If size was specified, set ITYPE to a range-type for
4327 that size. Otherwise, ITYPE remains null. finish_decl
4328 may figure it out from an initial value. */
4332 bool size_maybe_const = true;
4333 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
4334 && !TREE_OVERFLOW (size));
4335 bool this_size_varies = false;
4337 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4339 STRIP_TYPE_NOPS (size);
4341 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4343 error ("size of array %qs has non-integer type", name);
4344 size = integer_one_node;
4347 size = c_fully_fold (size, false, &size_maybe_const);
4349 if (pedantic && size_maybe_const && integer_zerop (size))
4350 pedwarn (input_location, OPT_pedantic,
4351 "ISO C forbids zero-size array %qs", name);
4353 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
4355 constant_expression_warning (size);
4356 if (tree_int_cst_sgn (size) < 0)
4358 error ("size of array %qs is negative", name);
4359 size = integer_one_node;
4361 /* Handle a size folded to an integer constant but
4362 not an integer constant expression. */
4363 if (!size_int_const)
4365 /* If this is a file scope declaration of an
4366 ordinary identifier, this is invalid code;
4367 diagnosing it here and not subsequently
4368 treating the type as variable-length avoids
4369 more confusing diagnostics later. */
4370 if ((decl_context == NORMAL || decl_context == FIELD)
4371 && current_scope == file_scope)
4372 pedwarn (input_location, 0,
4373 "variably modified %qs at file scope", name);
4375 this_size_varies = size_varies = 1;
4376 warn_variable_length_array (orig_name, size);
4379 else if ((decl_context == NORMAL || decl_context == FIELD)
4380 && current_scope == file_scope)
4382 error ("variably modified %qs at file scope", name);
4383 size = integer_one_node;
4387 /* Make sure the array size remains visibly
4388 nonconstant even if it is (eg) a const variable
4389 with known value. */
4390 this_size_varies = size_varies = 1;
4391 warn_variable_length_array (orig_name, size);
4394 if (integer_zerop (size) && !this_size_varies)
4396 /* A zero-length array cannot be represented with
4397 an unsigned index type, which is what we'll
4398 get with build_index_type. Create an
4399 open-ended range instead. */
4400 itype = build_range_type (sizetype, size, NULL_TREE);
4404 /* Arrange for the SAVE_EXPR on the inside of the
4405 MINUS_EXPR, which allows the -1 to get folded
4406 with the +1 that happens when building TYPE_SIZE. */
4408 size = variable_size (size);
4409 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
4410 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
4411 integer_zero_node, size);
4413 /* Compute the maximum valid index, that is, size
4414 - 1. Do the calculation in index_type, so that
4415 if it is a variable the computations will be
4416 done in the proper mode. */
4417 itype = fold_build2 (MINUS_EXPR, index_type,
4418 convert (index_type, size),
4419 convert (index_type,
4422 /* If that overflowed, the array is too big. ???
4423 While a size of INT_MAX+1 technically shouldn't
4424 cause an overflow (because we subtract 1), the
4425 overflow is recorded during the conversion to
4426 index_type, before the subtraction. Handling
4427 this case seems like an unnecessary
4429 if (TREE_CODE (itype) == INTEGER_CST
4430 && TREE_OVERFLOW (itype))
4432 error ("size of array %qs is too large", name);
4433 type = error_mark_node;
4437 itype = build_index_type (itype);
4439 if (this_size_varies)
4442 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
4446 *expr_const_operands &= size_maybe_const;
4449 else if (decl_context == FIELD)
4451 bool flexible_array_member = false;
4452 if (array_parm_vla_unspec_p)
4453 /* Field names can in fact have function prototype
4454 scope so [*] is disallowed here through making
4455 the field variably modified, not through being
4456 something other than a declaration with function
4461 const struct c_declarator *t = declarator;
4462 while (t->kind == cdk_attrs)
4464 flexible_array_member = (t->kind == cdk_id);
4466 if (flexible_array_member
4467 && pedantic && !flag_isoc99 && !in_system_header)
4468 pedwarn (input_location, OPT_pedantic,
4469 "ISO C90 does not support flexible array members");
4471 /* ISO C99 Flexible array members are effectively
4472 identical to GCC's zero-length array extension. */
4473 if (flexible_array_member || array_parm_vla_unspec_p)
4474 itype = build_range_type (sizetype, size_zero_node,
4477 else if (decl_context == PARM)
4479 if (array_parm_vla_unspec_p)
4481 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4485 else if (decl_context == TYPENAME)
4487 if (array_parm_vla_unspec_p)
4490 warning (0, "%<[*]%> not in a declaration");
4491 /* We use this to avoid messing up with incomplete
4492 array types of the same type, that would
4493 otherwise be modified below. */
4494 itype = build_range_type (sizetype, size_zero_node,
4500 /* Complain about arrays of incomplete types. */
4501 if (!COMPLETE_TYPE_P (type))
4503 error ("array type has incomplete element type");
4504 type = error_mark_node;
4507 /* When itype is NULL, a shared incomplete array type is
4508 returned for all array of a given type. Elsewhere we
4509 make sure we don't complete that type before copying
4510 it, but here we want to make sure we don't ever
4511 modify the shared type, so we gcc_assert (itype)
4513 type = build_array_type (type, itype);
4515 if (type != error_mark_node)
4519 /* It is ok to modify type here even if itype is
4520 NULL: if size_varies, we're in a
4521 multi-dimensional array and the inner type has
4522 variable size, so the enclosing shared array type
4524 if (size && TREE_CODE (size) == INTEGER_CST)
4526 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
4527 C_TYPE_VARIABLE_SIZE (type) = 1;
4530 /* The GCC extension for zero-length arrays differs from
4531 ISO flexible array members in that sizeof yields
4533 if (size && integer_zerop (size))
4536 TYPE_SIZE (type) = bitsize_zero_node;
4537 TYPE_SIZE_UNIT (type) = size_zero_node;
4539 if (array_parm_vla_unspec_p)
4542 /* The type is complete. C99 6.7.5.2p4 */
4543 TYPE_SIZE (type) = bitsize_zero_node;
4544 TYPE_SIZE_UNIT (type) = size_zero_node;
4548 if (decl_context != PARM
4549 && (array_ptr_quals != TYPE_UNQUALIFIED
4550 || array_ptr_attrs != NULL_TREE
4551 || array_parm_static))
4553 error ("static or type qualifiers in non-parameter array declarator");
4554 array_ptr_quals = TYPE_UNQUALIFIED;
4555 array_ptr_attrs = NULL_TREE;
4556 array_parm_static = 0;
4562 /* Say it's a definition only for the declarator closest
4563 to the identifier, apart possibly from some
4565 bool really_funcdef = false;
4569 const struct c_declarator *t = declarator->declarator;
4570 while (t->kind == cdk_attrs)
4572 really_funcdef = (t->kind == cdk_id);
4575 /* Declaring a function type. Make sure we have a valid
4576 type for the function to return. */
4577 if (type == error_mark_node)
4582 /* Warn about some types functions can't return. */
4583 if (TREE_CODE (type) == FUNCTION_TYPE)
4585 error ("%qs declared as function returning a function", name);
4586 type = integer_type_node;
4588 if (TREE_CODE (type) == ARRAY_TYPE)
4590 error ("%qs declared as function returning an array", name);
4591 type = integer_type_node;
4594 /* Construct the function type and go to the next
4595 inner layer of declarator. */
4596 arg_info = declarator->u.arg_info;
4597 arg_types = grokparms (arg_info, really_funcdef);
4599 put_pending_sizes (arg_info->pending_sizes);
4601 /* Type qualifiers before the return type of the function
4602 qualify the return type, not the function type. */
4605 /* Type qualifiers on a function return type are
4606 normally permitted by the standard but have no
4607 effect, so give a warning at -Wreturn-type.
4608 Qualifiers on a void return type are banned on
4609 function definitions in ISO C; GCC used to used
4610 them for noreturn functions. */
4611 if (VOID_TYPE_P (type) && really_funcdef)
4612 pedwarn (input_location, 0,
4613 "function definition has qualified void return type");
4615 warning (OPT_Wignored_qualifiers,
4616 "type qualifiers ignored on function return type");
4618 type = c_build_qualified_type (type, type_quals);
4620 type_quals = TYPE_UNQUALIFIED;
4622 type = build_function_type (type, arg_types);
4623 declarator = declarator->declarator;
4625 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4626 the formal parameter list of this FUNCTION_TYPE to point to
4627 the FUNCTION_TYPE node itself. */
4631 for (link = arg_info->tags;
4633 link = TREE_CHAIN (link))
4634 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4640 /* Merge any constancy or volatility into the target type
4643 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4645 pedwarn (input_location, OPT_pedantic,
4646 "ISO C forbids qualified function types");
4648 type = c_build_qualified_type (type, type_quals);
4651 /* When the pointed-to type involves components of variable size,
4652 care must be taken to ensure that the size evaluation code is
4653 emitted early enough to dominate all the possible later uses
4654 and late enough for the variables on which it depends to have
4657 This is expected to happen automatically when the pointed-to
4658 type has a name/declaration of it's own, but special attention
4659 is required if the type is anonymous.
4661 We handle the NORMAL and FIELD contexts here by attaching an
4662 artificial TYPE_DECL to such pointed-to type. This forces the
4663 sizes evaluation at a safe point and ensures it is not deferred
4664 until e.g. within a deeper conditional context.
4666 We expect nothing to be needed here for PARM or TYPENAME.
4667 Pushing a TYPE_DECL at this point for TYPENAME would actually
4668 be incorrect, as we might be in the middle of an expression
4669 with side effects on the pointed-to type size "arguments" prior
4670 to the pointer declaration point and the fake TYPE_DECL in the
4671 enclosing context would force the size evaluation prior to the
4674 if (!TYPE_NAME (type)
4675 && (decl_context == NORMAL || decl_context == FIELD)
4676 && variably_modified_type_p (type, NULL_TREE))
4678 tree decl = build_decl (TYPE_DECL, NULL_TREE, type);
4679 DECL_ARTIFICIAL (decl) = 1;
4681 finish_decl (decl, NULL_TREE, NULL_TREE);
4682 TYPE_NAME (type) = decl;
4685 type = build_pointer_type (type);
4687 /* Process type qualifiers (such as const or volatile)
4688 that were given inside the `*'. */
4689 type_quals = declarator->u.pointer_quals;
4691 declarator = declarator->declarator;
4698 *decl_attrs = chainon (returned_attrs, *decl_attrs);
4700 /* Now TYPE has the actual type, apart from any qualifiers in
4703 /* Check the type and width of a bit-field. */
4705 check_bitfield_type_and_width (&type, width, orig_name);
4707 /* Did array size calculations overflow? */
4709 if (TREE_CODE (type) == ARRAY_TYPE
4710 && COMPLETE_TYPE_P (type)
4711 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
4712 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
4714 error ("size of array %qs is too large", name);
4715 /* If we proceed with the array type as it is, we'll eventually
4716 crash in tree_low_cst(). */
4717 type = error_mark_node;
4720 /* If this is declaring a typedef name, return a TYPE_DECL. */
4722 if (storage_class == csc_typedef)
4725 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4727 pedwarn (input_location, OPT_pedantic,
4728 "ISO C forbids qualified function types");
4730 type = c_build_qualified_type (type, type_quals);
4731 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4732 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4733 if (declspecs->explicit_signed_p)
4734 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4735 if (declspecs->inline_p)
4736 pedwarn (input_location, 0,"typedef %q+D declared %<inline%>", decl);
4740 /* If this is a type name (such as, in a cast or sizeof),
4741 compute the type and return it now. */
4743 if (decl_context == TYPENAME)
4745 /* Note that the grammar rejects storage classes in typenames
4747 gcc_assert (storage_class == csc_none && !threadp
4748 && !declspecs->inline_p);
4749 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4751 pedwarn (input_location, OPT_pedantic,
4752 "ISO C forbids const or volatile function types");
4754 type = c_build_qualified_type (type, type_quals);
4758 if (pedantic && decl_context == FIELD
4759 && variably_modified_type_p (type, NULL_TREE))
4762 pedwarn (input_location, OPT_pedantic,
4763 "a member of a structure or union cannot have a variably modified type");
4766 /* Aside from typedefs and type names (handle above),
4767 `void' at top level (not within pointer)
4768 is allowed only in public variables.
4769 We don't complain about parms either, but that is because
4770 a better error message can be made later. */
4772 if (VOID_TYPE_P (type) && decl_context != PARM
4773 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4774 && (storage_class == csc_extern
4775 || (current_scope == file_scope
4776 && !(storage_class == csc_static
4777 || storage_class == csc_register)))))
4779 error ("variable or field %qs declared void", name);
4780 type = integer_type_node;
4783 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4784 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4789 if (decl_context == PARM)
4793 /* A parameter declared as an array of T is really a pointer to T.
4794 One declared as a function is really a pointer to a function. */
4796 if (TREE_CODE (type) == ARRAY_TYPE)
4798 /* Transfer const-ness of array into that of type pointed to. */
4799 type = TREE_TYPE (type);
4801 type = c_build_qualified_type (type, type_quals);
4802 type = build_pointer_type (type);
4803 type_quals = array_ptr_quals;
4805 type = c_build_qualified_type (type, type_quals);
4807 /* We don't yet implement attributes in this context. */
4808 if (array_ptr_attrs != NULL_TREE)
4809 warning (OPT_Wattributes,
4810 "attributes in parameter array declarator ignored");
4814 else if (TREE_CODE (type) == FUNCTION_TYPE)
4817 pedwarn (input_location, OPT_pedantic,
4818 "ISO C forbids qualified function types");
4820 type = c_build_qualified_type (type, type_quals);
4821 type = build_pointer_type (type);
4822 type_quals = TYPE_UNQUALIFIED;
4824 else if (type_quals)
4825 type = c_build_qualified_type (type, type_quals);
4827 decl = build_decl (PARM_DECL, declarator->u.id, type);
4828 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4830 C_DECL_VARIABLE_SIZE (decl) = 1;
4832 /* Compute the type actually passed in the parmlist,
4833 for the case where there is no prototype.
4834 (For example, shorts and chars are passed as ints.)
4835 When there is a prototype, this is overridden later. */
4837 if (type == error_mark_node)
4838 promoted_type = type;
4840 promoted_type = c_type_promotes_to (type);
4842 DECL_ARG_TYPE (decl) = promoted_type;
4843 if (declspecs->inline_p)
4844 pedwarn (input_location, 0, "parameter %q+D declared %<inline%>", decl);
4846 else if (decl_context == FIELD)
4848 /* Note that the grammar rejects storage classes in typenames
4850 gcc_assert (storage_class == csc_none && !threadp
4851 && !declspecs->inline_p);
4853 /* Structure field. It may not be a function. */
4855 if (TREE_CODE (type) == FUNCTION_TYPE)
4857 error ("field %qs declared as a function", name);
4858 type = build_pointer_type (type);
4860 else if (TREE_CODE (type) != ERROR_MARK
4861 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4863 error ("field %qs has incomplete type", name);
4864 type = error_mark_node;
4866 type = c_build_qualified_type (type, type_quals);
4867 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4868 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4869 DECL_NONADDRESSABLE_P (decl) = bitfield;
4870 if (bitfield && !declarator->u.id)
4871 TREE_NO_WARNING (decl) = 1;
4874 C_DECL_VARIABLE_SIZE (decl) = 1;
4876 else if (TREE_CODE (type) == FUNCTION_TYPE)
4878 if (storage_class == csc_register || threadp)
4880 error ("invalid storage class for function %qs", name);
4882 else if (current_scope != file_scope)
4884 /* Function declaration not at file scope. Storage
4885 classes other than `extern' are not allowed, C99
4886 6.7.1p5, and `extern' makes no difference. However,
4887 GCC allows 'auto', perhaps with 'inline', to support
4888 nested functions. */
4889 if (storage_class == csc_auto)
4890 pedwarn (input_location, OPT_pedantic, "invalid storage class for function %qs", name);
4891 else if (storage_class == csc_static)
4893 error ("invalid storage class for function %qs", name);
4895 storage_class = declspecs->storage_class = csc_none;
4901 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4902 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4903 decl = build_decl_attribute_variant (decl, decl_attr);
4905 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4906 pedwarn (input_location, OPT_pedantic,
4907 "ISO C forbids qualified function types");
4909 /* GNU C interprets a volatile-qualified function type to indicate
4910 that the function does not return. */
4911 if ((type_quals & TYPE_QUAL_VOLATILE)
4912 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4913 warning (0, "%<noreturn%> function returns non-void value");
4915 /* Every function declaration is an external reference
4916 (DECL_EXTERNAL) except for those which are not at file
4917 scope and are explicitly declared "auto". This is
4918 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4919 GCC to signify a forward declaration of a nested function. */
4920 if (storage_class == csc_auto && current_scope != file_scope)
4921 DECL_EXTERNAL (decl) = 0;
4922 /* In C99, a function which is declared 'inline' with 'extern'
4923 is not an external reference (which is confusing). It
4924 means that the later definition of the function must be output
4925 in this file, C99 6.7.4p6. In GNU C89, a function declared
4926 'extern inline' is an external reference. */
4927 else if (declspecs->inline_p && storage_class != csc_static)
4928 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
4929 == flag_gnu89_inline);
4931 DECL_EXTERNAL (decl) = !initialized;
4933 /* Record absence of global scope for `static' or `auto'. */
4935 = !(storage_class == csc_static || storage_class == csc_auto);
4937 /* For a function definition, record the argument information
4938 block where store_parm_decls will look for it. */
4940 current_function_arg_info = arg_info;
4942 if (declspecs->default_int_p)
4943 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4945 /* Record presence of `inline', if it is reasonable. */
4946 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4948 if (declspecs->inline_p)
4949 pedwarn (input_location, 0, "cannot inline function %<main%>");
4951 else if (declspecs->inline_p)
4952 /* Record that the function is declared `inline'. */
4953 DECL_DECLARED_INLINE_P (decl) = 1;
4957 /* It's a variable. */
4958 /* An uninitialized decl with `extern' is a reference. */
4959 int extern_ref = !initialized && storage_class == csc_extern;
4961 type = c_build_qualified_type (type, type_quals);
4963 /* C99 6.2.2p7: It is invalid (compile-time undefined
4964 behavior) to create an 'extern' declaration for a
4965 variable if there is a global declaration that is
4966 'static' and the global declaration is not visible.
4967 (If the static declaration _is_ currently visible,
4968 the 'extern' declaration is taken to refer to that decl.) */
4969 if (extern_ref && current_scope != file_scope)
4971 tree global_decl = identifier_global_value (declarator->u.id);
4972 tree visible_decl = lookup_name (declarator->u.id);
4975 && global_decl != visible_decl
4976 && TREE_CODE (global_decl) == VAR_DECL
4977 && !TREE_PUBLIC (global_decl))
4978 error ("variable previously declared %<static%> redeclared "
4982 decl = build_decl (VAR_DECL, declarator->u.id, type);
4983 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4985 C_DECL_VARIABLE_SIZE (decl) = 1;
4987 if (declspecs->inline_p)
4988 pedwarn (input_location, 0, "variable %q+D declared %<inline%>", decl);
4990 /* At file scope, an initialized extern declaration may follow
4991 a static declaration. In that case, DECL_EXTERNAL will be
4992 reset later in start_decl. */
4993 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4995 /* At file scope, the presence of a `static' or `register' storage
4996 class specifier, or the absence of all storage class specifiers
4997 makes this declaration a definition (perhaps tentative). Also,
4998 the absence of `static' makes it public. */
4999 if (current_scope == file_scope)
5001 TREE_PUBLIC (decl) = storage_class != csc_static;
5002 TREE_STATIC (decl) = !extern_ref;
5004 /* Not at file scope, only `static' makes a static definition. */
5007 TREE_STATIC (decl) = (storage_class == csc_static);
5008 TREE_PUBLIC (decl) = extern_ref;
5012 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
5015 if (storage_class == csc_extern
5016 && variably_modified_type_p (type, NULL_TREE))
5019 error ("object with variably modified type must have no linkage");
5022 /* Record `register' declaration for warnings on &
5023 and in case doing stupid register allocation. */
5025 if (storage_class == csc_register)
5027 C_DECL_REGISTER (decl) = 1;
5028 DECL_REGISTER (decl) = 1;
5031 /* Record constancy and volatility. */
5032 c_apply_type_quals_to_decl (type_quals, decl);
5034 /* If a type has volatile components, it should be stored in memory.
5035 Otherwise, the fact that those components are volatile
5036 will be ignored, and would even crash the compiler.
5037 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
5038 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
5039 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
5040 || TREE_CODE (decl) == RESULT_DECL))
5042 /* It is not an error for a structure with volatile fields to
5043 be declared register, but reset DECL_REGISTER since it
5044 cannot actually go in a register. */
5045 int was_reg = C_DECL_REGISTER (decl);
5046 C_DECL_REGISTER (decl) = 0;
5047 DECL_REGISTER (decl) = 0;
5048 c_mark_addressable (decl);
5049 C_DECL_REGISTER (decl) = was_reg;
5052 /* This is the earliest point at which we might know the assembler
5053 name of a variable. Thus, if it's known before this, die horribly. */
5054 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
5060 /* Decode the parameter-list info for a function type or function definition.
5061 The argument is the value returned by `get_parm_info' (or made in c-parse.c
5062 if there is an identifier list instead of a parameter decl list).
5063 These two functions are separate because when a function returns
5064 or receives functions then each is called multiple times but the order
5065 of calls is different. The last call to `grokparms' is always the one
5066 that contains the formal parameter names of a function definition.
5068 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5070 FUNCDEF_FLAG is true for a function definition, false for
5071 a mere declaration. A nonempty identifier-list gets an error message
5072 when FUNCDEF_FLAG is false. */
5075 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
5077 tree arg_types = arg_info->types;
5079 if (funcdef_flag && arg_info->had_vla_unspec)
5081 /* A function definition isn't function prototype scope C99 6.2.1p4. */
5083 error ("%<[*]%> not allowed in other than function prototype scope");
5086 if (arg_types == 0 && !funcdef_flag && !in_system_header)
5087 warning (OPT_Wstrict_prototypes,
5088 "function declaration isn%'t a prototype");
5090 if (arg_types == error_mark_node)
5091 return 0; /* don't set TYPE_ARG_TYPES in this case */
5093 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
5096 pedwarn (input_location, 0, "parameter names (without types) in function declaration");
5098 arg_info->parms = arg_info->types;
5099 arg_info->types = 0;
5104 tree parm, type, typelt;
5105 unsigned int parmno;
5107 /* If there is a parameter of incomplete type in a definition,
5108 this is an error. In a declaration this is valid, and a
5109 struct or union type may be completed later, before any calls
5110 or definition of the function. In the case where the tag was
5111 first declared within the parameter list, a warning has
5112 already been given. If a parameter has void type, then
5113 however the function cannot be defined or called, so
5116 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
5118 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
5120 type = TREE_VALUE (typelt);
5121 if (type == error_mark_node)
5124 if (!COMPLETE_TYPE_P (type))
5128 if (DECL_NAME (parm))
5129 error ("parameter %u (%q+D) has incomplete type",
5132 error ("%Jparameter %u has incomplete type",
5135 TREE_VALUE (typelt) = error_mark_node;
5136 TREE_TYPE (parm) = error_mark_node;
5138 else if (VOID_TYPE_P (type))
5140 if (DECL_NAME (parm))
5141 warning (0, "parameter %u (%q+D) has void type",
5144 warning (0, "%Jparameter %u has void type",
5149 if (DECL_NAME (parm) && TREE_USED (parm))
5150 warn_if_shadowing (parm);
5156 /* Take apart the current scope and return a c_arg_info structure with
5157 info on a parameter list just parsed.
5159 This structure is later fed to 'grokparms' and 'store_parm_decls'.
5161 ELLIPSIS being true means the argument list ended in '...' so don't
5162 append a sentinel (void_list_node) to the end of the type-list. */
5165 get_parm_info (bool ellipsis)
5167 struct c_binding *b = current_scope->bindings;
5168 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
5175 static bool explained_incomplete_types = false;
5176 bool gave_void_only_once_err = false;
5178 arg_info->parms = 0;
5180 arg_info->types = 0;
5181 arg_info->others = 0;
5182 arg_info->pending_sizes = 0;
5183 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
5185 /* The bindings in this scope must not get put into a block.
5186 We will take care of deleting the binding nodes. */
5187 current_scope->bindings = 0;
5189 /* This function is only called if there was *something* on the
5193 /* A parameter list consisting solely of 'void' indicates that the
5194 function takes no arguments. But if the 'void' is qualified
5195 (by 'const' or 'volatile'), or has a storage class specifier
5196 ('register'), then the behavior is undefined; issue an error.
5197 Typedefs for 'void' are OK (see DR#157). */
5198 if (b->prev == 0 /* one binding */
5199 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
5200 && !DECL_NAME (b->decl) /* anonymous */
5201 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
5203 if (TREE_THIS_VOLATILE (b->decl)
5204 || TREE_READONLY (b->decl)
5205 || C_DECL_REGISTER (b->decl))
5206 error ("%<void%> as only parameter may not be qualified");
5208 /* There cannot be an ellipsis. */
5210 error ("%<void%> must be the only parameter");
5212 arg_info->types = void_list_node;
5217 types = void_list_node;
5219 /* Break up the bindings list into parms, tags, types, and others;
5220 apply sanity checks; purge the name-to-decl bindings. */
5223 tree decl = b->decl;
5224 tree type = TREE_TYPE (decl);
5225 const char *keyword;
5227 switch (TREE_CODE (decl))
5232 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5233 I_SYMBOL_BINDING (b->id) = b->shadowed;
5236 /* Check for forward decls that never got their actual decl. */
5237 if (TREE_ASM_WRITTEN (decl))
5238 error ("parameter %q+D has just a forward declaration", decl);
5239 /* Check for (..., void, ...) and issue an error. */
5240 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
5242 if (!gave_void_only_once_err)
5244 error ("%<void%> must be the only parameter");
5245 gave_void_only_once_err = true;
5250 /* Valid parameter, add it to the list. */
5251 TREE_CHAIN (decl) = parms;
5254 /* Since there is a prototype, args are passed in their
5255 declared types. The back end may override this later. */
5256 DECL_ARG_TYPE (decl) = type;
5257 types = tree_cons (0, type, types);
5261 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
5262 case UNION_TYPE: keyword = "union"; goto tag;
5263 case RECORD_TYPE: keyword = "struct"; goto tag;
5265 /* Types may not have tag-names, in which case the type
5266 appears in the bindings list with b->id NULL. */
5269 gcc_assert (I_TAG_BINDING (b->id) == b);
5270 I_TAG_BINDING (b->id) = b->shadowed;
5273 /* Warn about any struct, union or enum tags defined in a
5274 parameter list. The scope of such types is limited to
5275 the parameter list, which is rarely if ever desirable
5276 (it's impossible to call such a function with type-
5277 correct arguments). An anonymous union parm type is
5278 meaningful as a GNU extension, so don't warn for that. */
5279 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
5282 /* The %s will be one of 'struct', 'union', or 'enum'. */
5283 warning (0, "%<%s %E%> declared inside parameter list",
5286 /* The %s will be one of 'struct', 'union', or 'enum'. */
5287 warning (0, "anonymous %s declared inside parameter list",
5290 if (!explained_incomplete_types)
5292 warning (0, "its scope is only this definition or declaration,"
5293 " which is probably not what you want");
5294 explained_incomplete_types = true;
5298 tags = tree_cons (b->id, decl, tags);
5304 /* CONST_DECLs appear here when we have an embedded enum,
5305 and TYPE_DECLs appear here when we have an embedded struct
5306 or union. No warnings for this - we already warned about the
5307 type itself. FUNCTION_DECLs appear when there is an implicit
5308 function declaration in the parameter list. */
5310 TREE_CHAIN (decl) = others;
5315 /* error_mark_node appears here when we have an undeclared
5316 variable. Just throw it away. */
5319 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5320 I_SYMBOL_BINDING (b->id) = b->shadowed;
5324 /* Other things that might be encountered. */
5331 b = free_binding_and_advance (b);
5334 arg_info->parms = parms;
5335 arg_info->tags = tags;
5336 arg_info->types = types;
5337 arg_info->others = others;
5338 arg_info->pending_sizes = get_pending_sizes ();
5342 /* Get the struct, enum or union (CODE says which) with tag NAME.
5343 Define the tag as a forward-reference if it is not defined.
5344 Return a c_typespec structure for the type specifier. */
5347 parser_xref_tag (enum tree_code code, tree name)
5349 struct c_typespec ret;
5352 ret.expr = NULL_TREE;
5353 ret.expr_const_operands = true;
5355 /* If a cross reference is requested, look up the type
5356 already defined for this tag and return it. */
5358 ref = lookup_tag (code, name, 0);
5359 /* If this is the right type of tag, return what we found.
5360 (This reference will be shadowed by shadow_tag later if appropriate.)
5361 If this is the wrong type of tag, do not return it. If it was the
5362 wrong type in the same scope, we will have had an error
5363 message already; if in a different scope and declaring
5364 a name, pending_xref_error will give an error message; but if in a
5365 different scope and not declaring a name, this tag should
5366 shadow the previous declaration of a different type of tag, and
5367 this would not work properly if we return the reference found.
5368 (For example, with "struct foo" in an outer scope, "union foo;"
5369 must shadow that tag with a new one of union type.) */
5370 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5371 if (ref && TREE_CODE (ref) == code)
5377 /* If no such tag is yet defined, create a forward-reference node
5378 and record it as the "definition".
5379 When a real declaration of this type is found,
5380 the forward-reference will be altered into a real type. */
5382 ref = make_node (code);
5383 if (code == ENUMERAL_TYPE)
5385 /* Give the type a default layout like unsigned int
5386 to avoid crashing if it does not get defined. */
5387 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
5388 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5389 TYPE_USER_ALIGN (ref) = 0;
5390 TYPE_UNSIGNED (ref) = 1;
5391 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5392 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5393 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5396 pushtag (name, ref);
5402 /* Get the struct, enum or union (CODE says which) with tag NAME.
5403 Define the tag as a forward-reference if it is not defined.
5404 Return a tree for the type. */
5407 xref_tag (enum tree_code code, tree name)
5409 return parser_xref_tag (code, name).spec;
5412 /* Make sure that the tag NAME is defined *in the current scope*
5413 at least as a forward reference.
5414 CODE says which kind of tag NAME ought to be. */
5417 start_struct (enum tree_code code, tree name)
5419 /* If there is already a tag defined at this scope
5420 (as a forward reference), just return it. */
5425 ref = lookup_tag (code, name, 1);
5426 if (ref && TREE_CODE (ref) == code)
5428 if (TYPE_SIZE (ref))
5430 if (code == UNION_TYPE)
5431 error ("redefinition of %<union %E%>", name);
5433 error ("redefinition of %<struct %E%>", name);
5434 /* Don't create structures using a name already in use. */
5437 else if (C_TYPE_BEING_DEFINED (ref))
5439 if (code == UNION_TYPE)
5440 error ("nested redefinition of %<union %E%>", name);
5442 error ("nested redefinition of %<struct %E%>", name);
5443 /* Don't create structures that contain themselves. */
5448 /* Otherwise create a forward-reference just so the tag is in scope. */
5450 if (ref == NULL_TREE || TREE_CODE (ref) != code)
5452 ref = make_node (code);
5453 pushtag (name, ref);
5456 C_TYPE_BEING_DEFINED (ref) = 1;
5457 TYPE_PACKED (ref) = flag_pack_struct;
5461 /* Process the specs, declarator and width (NULL if omitted)
5462 of a structure component, returning a FIELD_DECL node.
5463 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5464 DECL_ATTRS is as for grokdeclarator.
5466 LOC is the location of the structure component.
5468 This is done during the parsing of the struct declaration.
5469 The FIELD_DECL nodes are chained together and the lot of them
5470 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5473 grokfield (location_t loc,
5474 struct c_declarator *declarator, struct c_declspecs *declspecs,
5475 tree width, tree *decl_attrs)
5479 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5480 && width == NULL_TREE)
5482 /* This is an unnamed decl.
5484 If we have something of the form "union { list } ;" then this
5485 is the anonymous union extension. Similarly for struct.
5487 If this is something of the form "struct foo;", then
5488 If MS extensions are enabled, this is handled as an
5490 Otherwise this is a forward declaration of a structure tag.
5492 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5493 If MS extensions are enabled and foo names a structure, then
5494 again this is an anonymous struct.
5495 Otherwise this is an error.
5497 Oh what a horrid tangled web we weave. I wonder if MS consciously
5498 took this from Plan 9 or if it was an accident of implementation
5499 that took root before someone noticed the bug... */
5501 tree type = declspecs->type;
5502 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5503 || TREE_CODE (type) == UNION_TYPE);
5507 && (flag_ms_extensions || !declspecs->typedef_p))
5509 if (flag_ms_extensions)
5513 else if (TYPE_NAME (type) == NULL)
5520 pedwarn (loc, 0, "declaration does not declare anything");
5523 pedwarn (loc, OPT_pedantic, "ISO C doesn%'t support unnamed structs/unions");
5526 value = grokdeclarator (declarator, declspecs, FIELD, false,
5527 width ? &width : NULL, decl_attrs, NULL, NULL,
5530 finish_decl (value, NULL_TREE, NULL_TREE);
5531 DECL_INITIAL (value) = width;
5536 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5537 the list such that this does not present a problem later. */
5540 detect_field_duplicates (tree fieldlist)
5545 /* First, see if there are more than "a few" fields.
5546 This is trivially true if there are zero or one fields. */
5549 x = TREE_CHAIN (fieldlist);
5555 } while (timeout > 0 && x);
5557 /* If there were "few" fields, avoid the overhead of allocating
5558 a hash table. Instead just do the nested traversal thing. */
5561 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5564 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5565 if (DECL_NAME (y) == DECL_NAME (x))
5567 error ("duplicate member %q+D", x);
5568 DECL_NAME (x) = NULL_TREE;
5574 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5577 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5578 if ((y = DECL_NAME (x)) != 0)
5580 slot = htab_find_slot (htab, y, INSERT);
5583 error ("duplicate member %q+D", x);
5584 DECL_NAME (x) = NULL_TREE;
5593 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5594 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5595 ATTRIBUTES are attributes to be applied to the structure. */
5598 finish_struct (tree t, tree fieldlist, tree attributes)
5601 bool toplevel = file_scope == current_scope;
5602 int saw_named_field;
5604 /* If this type was previously laid out as a forward reference,
5605 make sure we lay it out again. */
5609 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5613 for (x = fieldlist; x; x = TREE_CHAIN (x))
5614 if (DECL_NAME (x) != 0)
5619 if (TREE_CODE (t) == UNION_TYPE)
5622 pedwarn (input_location, OPT_pedantic, "union has no named members");
5624 pedwarn (input_location, OPT_pedantic, "union has no members");
5629 pedwarn (input_location, OPT_pedantic, "struct has no named members");
5631 pedwarn (input_location, OPT_pedantic, "struct has no members");
5636 /* Install struct as DECL_CONTEXT of each field decl.
5637 Also process specified field sizes, found in the DECL_INITIAL,
5638 storing 0 there after the type has been changed to precision equal
5639 to its width, rather than the precision of the specified standard
5640 type. (Correct layout requires the original type to have been preserved
5643 saw_named_field = 0;
5644 for (x = fieldlist; x; x = TREE_CHAIN (x))
5646 if (TREE_TYPE (x) == error_mark_node)
5649 DECL_CONTEXT (x) = t;
5651 /* If any field is const, the structure type is pseudo-const. */
5652 if (TREE_READONLY (x))
5653 C_TYPE_FIELDS_READONLY (t) = 1;
5656 /* A field that is pseudo-const makes the structure likewise. */
5657 tree t1 = TREE_TYPE (x);
5658 while (TREE_CODE (t1) == ARRAY_TYPE)
5659 t1 = TREE_TYPE (t1);
5660 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5661 && C_TYPE_FIELDS_READONLY (t1))
5662 C_TYPE_FIELDS_READONLY (t) = 1;
5665 /* Any field that is volatile means variables of this type must be
5666 treated in some ways as volatile. */
5667 if (TREE_THIS_VOLATILE (x))
5668 C_TYPE_FIELDS_VOLATILE (t) = 1;
5670 /* Any field of nominal variable size implies structure is too. */
5671 if (C_DECL_VARIABLE_SIZE (x))
5672 C_TYPE_VARIABLE_SIZE (t) = 1;
5674 if (DECL_INITIAL (x))
5676 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5677 DECL_SIZE (x) = bitsize_int (width);
5678 DECL_BIT_FIELD (x) = 1;
5679 SET_DECL_C_BIT_FIELD (x);
5683 && (DECL_BIT_FIELD (x)
5684 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
5685 DECL_PACKED (x) = 1;
5687 /* Detect flexible array member in an invalid context. */
5688 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5689 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5690 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5691 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5693 if (TREE_CODE (t) == UNION_TYPE)
5695 error ("%Jflexible array member in union", x);
5696 TREE_TYPE (x) = error_mark_node;
5698 else if (TREE_CHAIN (x) != NULL_TREE)
5700 error ("%Jflexible array member not at end of struct", x);
5701 TREE_TYPE (x) = error_mark_node;
5703 else if (!saw_named_field)
5705 error ("%Jflexible array member in otherwise empty struct", x);
5706 TREE_TYPE (x) = error_mark_node;
5710 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5711 && flexible_array_type_p (TREE_TYPE (x)))
5712 pedwarn (input_location, OPT_pedantic,
5713 "%Jinvalid use of structure with flexible array member", x);
5716 saw_named_field = 1;
5719 detect_field_duplicates (fieldlist);
5721 /* Now we have the nearly final fieldlist. Record it,
5722 then lay out the structure or union (including the fields). */
5724 TYPE_FIELDS (t) = fieldlist;
5728 /* Give bit-fields their proper types. */
5730 tree *fieldlistp = &fieldlist;
5732 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5733 && TREE_TYPE (*fieldlistp) != error_mark_node)
5735 unsigned HOST_WIDE_INT width
5736 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5737 tree type = TREE_TYPE (*fieldlistp);
5738 if (width != TYPE_PRECISION (type))
5740 TREE_TYPE (*fieldlistp)
5741 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5742 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5744 DECL_INITIAL (*fieldlistp) = 0;
5747 fieldlistp = &TREE_CHAIN (*fieldlistp);
5750 /* Now we have the truly final field list.
5751 Store it in this type and in the variants. */
5753 TYPE_FIELDS (t) = fieldlist;
5755 /* If there are lots of fields, sort so we can look through them fast.
5756 We arbitrarily consider 16 or more elts to be "a lot". */
5761 for (x = fieldlist; x; x = TREE_CHAIN (x))
5763 if (len > 15 || DECL_NAME (x) == NULL)
5771 struct lang_type *space;
5772 struct sorted_fields_type *space2;
5774 len += list_length (x);
5776 /* Use the same allocation policy here that make_node uses, to
5777 ensure that this lives as long as the rest of the struct decl.
5778 All decls in an inline function need to be saved. */
5780 space = GGC_CNEW (struct lang_type);
5781 space2 = GGC_NEWVAR (struct sorted_fields_type,
5782 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5786 field_array = &space2->elts[0];
5787 for (x = fieldlist; x; x = TREE_CHAIN (x))
5789 field_array[len++] = x;
5791 /* If there is anonymous struct or union, break out of the loop. */
5792 if (DECL_NAME (x) == NULL)
5795 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5798 TYPE_LANG_SPECIFIC (t) = space;
5799 TYPE_LANG_SPECIFIC (t)->s->len = len;
5800 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5801 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5806 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5808 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5809 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5810 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5811 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5812 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5815 /* If this was supposed to be a transparent union, but we can't
5816 make it one, warn and turn off the flag. */
5817 if (TREE_CODE (t) == UNION_TYPE
5818 && TYPE_TRANSPARENT_UNION (t)
5819 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5821 TYPE_TRANSPARENT_UNION (t) = 0;
5822 warning (0, "union cannot be made transparent");
5825 /* If this structure or union completes the type of any previous
5826 variable declaration, lay it out and output its rtl. */
5827 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5831 tree decl = TREE_VALUE (x);
5832 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5833 layout_array_type (TREE_TYPE (decl));
5834 if (TREE_CODE (decl) != TYPE_DECL)
5836 layout_decl (decl, 0);
5837 if (c_dialect_objc ())
5838 objc_check_decl (decl);
5839 rest_of_decl_compilation (decl, toplevel, 0);
5844 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5846 /* Finish debugging output for this type. */
5847 rest_of_type_compilation (t, toplevel);
5849 /* If we're inside a function proper, i.e. not file-scope and not still
5850 parsing parameters, then arrange for the size of a variable sized type
5852 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
5853 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5858 /* Lay out the type T, and its element type, and so on. */
5861 layout_array_type (tree t)
5863 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5864 layout_array_type (TREE_TYPE (t));
5868 /* Begin compiling the definition of an enumeration type.
5869 NAME is its name (or null if anonymous).
5870 Returns the type object, as yet incomplete.
5871 Also records info about it so that build_enumerator
5872 may be used to declare the individual values as they are read. */
5875 start_enum (struct c_enum_contents *the_enum, tree name)
5879 /* If this is the real definition for a previous forward reference,
5880 fill in the contents in the same object that used to be the
5881 forward reference. */
5884 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5886 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5888 enumtype = make_node (ENUMERAL_TYPE);
5889 pushtag (name, enumtype);
5892 if (C_TYPE_BEING_DEFINED (enumtype))
5893 error ("nested redefinition of %<enum %E%>", name);
5895 C_TYPE_BEING_DEFINED (enumtype) = 1;
5897 if (TYPE_VALUES (enumtype) != 0)
5899 /* This enum is a named one that has been declared already. */
5900 error ("redeclaration of %<enum %E%>", name);
5902 /* Completely replace its old definition.
5903 The old enumerators remain defined, however. */
5904 TYPE_VALUES (enumtype) = 0;
5907 the_enum->enum_next_value = integer_zero_node;
5908 the_enum->enum_overflow = 0;
5910 if (flag_short_enums)
5911 TYPE_PACKED (enumtype) = 1;
5916 /* After processing and defining all the values of an enumeration type,
5917 install their decls in the enumeration type and finish it off.
5918 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5919 and ATTRIBUTES are the specified attributes.
5920 Returns ENUMTYPE. */
5923 finish_enum (tree enumtype, tree values, tree attributes)
5926 tree minnode = 0, maxnode = 0;
5927 int precision, unsign;
5928 bool toplevel = (file_scope == current_scope);
5929 struct lang_type *lt;
5931 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5933 /* Calculate the maximum value of any enumerator in this type. */
5935 if (values == error_mark_node)
5936 minnode = maxnode = integer_zero_node;
5939 minnode = maxnode = TREE_VALUE (values);
5940 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5942 tree value = TREE_VALUE (pair);
5943 if (tree_int_cst_lt (maxnode, value))
5945 if (tree_int_cst_lt (value, minnode))
5950 /* Construct the final type of this enumeration. It is the same
5951 as one of the integral types - the narrowest one that fits, except
5952 that normally we only go as narrow as int - and signed iff any of
5953 the values are negative. */
5954 unsign = (tree_int_cst_sgn (minnode) >= 0);
5955 precision = MAX (tree_int_cst_min_precision (minnode, unsign),
5956 tree_int_cst_min_precision (maxnode, unsign));
5958 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5960 tem = c_common_type_for_size (precision, unsign);
5963 warning (0, "enumeration values exceed range of largest integer");
5964 tem = long_long_integer_type_node;
5968 tem = unsign ? unsigned_type_node : integer_type_node;
5970 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5971 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5972 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5973 TYPE_SIZE (enumtype) = 0;
5975 /* If the precision of the type was specific with an attribute and it
5976 was too small, give an error. Otherwise, use it. */
5977 if (TYPE_PRECISION (enumtype))
5979 if (precision > TYPE_PRECISION (enumtype))
5980 error ("specified mode too small for enumeral values");
5983 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5985 layout_type (enumtype);
5987 if (values != error_mark_node)
5989 /* Change the type of the enumerators to be the enum type. We
5990 need to do this irrespective of the size of the enum, for
5991 proper type checking. Replace the DECL_INITIALs of the
5992 enumerators, and the value slots of the list, with copies
5993 that have the enum type; they cannot be modified in place
5994 because they may be shared (e.g. integer_zero_node) Finally,
5995 change the purpose slots to point to the names of the decls. */
5996 for (pair = values; pair; pair = TREE_CHAIN (pair))
5998 tree enu = TREE_PURPOSE (pair);
5999 tree ini = DECL_INITIAL (enu);
6001 TREE_TYPE (enu) = enumtype;
6003 /* The ISO C Standard mandates enumerators to have type int,
6004 even though the underlying type of an enum type is
6005 unspecified. However, GCC allows enumerators of any
6006 integer type as an extensions. build_enumerator()
6007 converts any enumerators that fit in an int to type int,
6008 to avoid promotions to unsigned types when comparing
6009 integers with enumerators that fit in the int range.
6010 When -pedantic is given, build_enumerator() would have
6011 already warned about those that don't fit. Here we
6012 convert the rest to the enumerator type. */
6013 if (TREE_TYPE (ini) != integer_type_node)
6014 ini = convert (enumtype, ini);
6016 DECL_INITIAL (enu) = ini;
6017 TREE_PURPOSE (pair) = DECL_NAME (enu);
6018 TREE_VALUE (pair) = ini;
6021 TYPE_VALUES (enumtype) = values;
6024 /* Record the min/max values so that we can warn about bit-field
6025 enumerations that are too small for the values. */
6026 lt = GGC_CNEW (struct lang_type);
6027 lt->enum_min = minnode;
6028 lt->enum_max = maxnode;
6029 TYPE_LANG_SPECIFIC (enumtype) = lt;
6031 /* Fix up all variant types of this enum type. */
6032 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6034 if (tem == enumtype)
6036 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6037 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6038 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6039 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6040 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
6041 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
6042 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6043 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6044 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
6045 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
6046 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
6049 /* Finish debugging output for this type. */
6050 rest_of_type_compilation (enumtype, toplevel);
6055 /* Build and install a CONST_DECL for one value of the
6056 current enumeration type (one that was begun with start_enum).
6057 Return a tree-list containing the CONST_DECL and its value.
6058 Assignment of sequential values by default is handled here. */
6061 build_enumerator (struct c_enum_contents *the_enum, tree name, tree value,
6062 location_t value_loc)
6066 /* Validate and default VALUE. */
6070 /* Don't issue more errors for error_mark_node (i.e. an
6071 undeclared identifier) - just ignore the value expression. */
6072 if (value == error_mark_node)
6074 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
6075 || TREE_CODE (value) != INTEGER_CST)
6077 error ("enumerator value for %qE is not an integer constant", name);
6082 value = default_conversion (value);
6083 constant_expression_warning (value);
6087 /* Default based on previous value. */
6088 /* It should no longer be possible to have NON_LVALUE_EXPR
6092 value = the_enum->enum_next_value;
6093 if (the_enum->enum_overflow)
6094 error ("overflow in enumeration values");
6096 /* Even though the underlying type of an enum is unspecified, the
6097 type of enumeration constants is explicitly defined as int
6098 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
6100 else if (!int_fits_type_p (value, integer_type_node))
6101 pedwarn (value_loc, OPT_pedantic,
6102 "ISO C restricts enumerator values to range of %<int%>");
6104 /* The ISO C Standard mandates enumerators to have type int, even
6105 though the underlying type of an enum type is unspecified.
6106 However, GCC allows enumerators of any integer type as an
6107 extensions. Here we convert any enumerators that fit in an int
6108 to type int, to avoid promotions to unsigned types when comparing
6109 integers with enumerators that fit in the int range. When
6110 -pedantic is given, we would have already warned about those that
6111 don't fit. We have to do this here rather than in finish_enum
6112 because this value may be used to define more enumerators. */
6113 if (int_fits_type_p (value, integer_type_node))
6114 value = convert (integer_type_node, value);
6116 /* Set basis for default for next value. */
6117 the_enum->enum_next_value
6119 (EXPR_HAS_LOCATION (value) ? EXPR_LOCATION (value) : input_location,
6120 PLUS_EXPR, value, integer_one_node, 0);
6121 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
6123 /* Now create a declaration for the enum value name. */
6125 type = TREE_TYPE (value);
6126 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
6127 TYPE_PRECISION (integer_type_node)),
6128 (TYPE_PRECISION (type)
6129 >= TYPE_PRECISION (integer_type_node)
6130 && TYPE_UNSIGNED (type)));
6132 decl = build_decl (CONST_DECL, name, type);
6133 DECL_INITIAL (decl) = convert (type, value);
6136 return tree_cons (decl, value, NULL_TREE);
6140 /* Create the FUNCTION_DECL for a function definition.
6141 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6142 the declaration; they describe the function's name and the type it returns,
6143 but twisted together in a fashion that parallels the syntax of C.
6145 This function creates a binding context for the function body
6146 as well as setting up the FUNCTION_DECL in current_function_decl.
6148 Returns 1 on success. If the DECLARATOR is not suitable for a function
6149 (it defines a datum instead), we return 0, which tells
6150 yyparse to report a parse error. */
6153 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
6156 tree decl1, old_decl;
6157 tree restype, resdecl;
6158 struct c_label_context_se *nstack_se;
6159 struct c_label_context_vm *nstack_vm;
6161 current_function_returns_value = 0; /* Assume, until we see it does. */
6162 current_function_returns_null = 0;
6163 current_function_returns_abnormally = 0;
6164 warn_about_return_type = 0;
6165 c_switch_stack = NULL;
6167 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
6168 nstack_se->labels_def = NULL;
6169 nstack_se->labels_used = NULL;
6170 nstack_se->next = label_context_stack_se;
6171 label_context_stack_se = nstack_se;
6173 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
6174 nstack_vm->labels_def = NULL;
6175 nstack_vm->labels_used = NULL;
6176 nstack_vm->scope = 0;
6177 nstack_vm->next = label_context_stack_vm;
6178 label_context_stack_vm = nstack_vm;
6180 /* Indicate no valid break/continue context by setting these variables
6181 to some non-null, non-label value. We'll notice and emit the proper
6182 error message in c_finish_bc_stmt. */
6183 c_break_label = c_cont_label = size_zero_node;
6185 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
6186 &attributes, NULL, NULL, DEPRECATED_NORMAL);
6188 /* If the declarator is not suitable for a function definition,
6189 cause a syntax error. */
6192 label_context_stack_se = label_context_stack_se->next;
6193 label_context_stack_vm = label_context_stack_vm->next;
6197 decl_attributes (&decl1, attributes, 0);
6199 if (DECL_DECLARED_INLINE_P (decl1)
6200 && DECL_UNINLINABLE (decl1)
6201 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6202 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
6205 /* Handle gnu_inline attribute. */
6206 if (declspecs->inline_p
6207 && !flag_gnu89_inline
6208 && TREE_CODE (decl1) == FUNCTION_DECL
6209 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
6210 || current_function_decl))
6212 if (declspecs->storage_class != csc_static)
6213 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
6216 announce_function (decl1);
6218 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6220 error ("return type is an incomplete type");
6221 /* Make it return void instead. */
6223 = build_function_type (void_type_node,
6224 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6227 if (warn_about_return_type)
6228 pedwarn_c99 (input_location, flag_isoc99 ? 0
6229 : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int),
6230 "return type defaults to %<int%>");
6232 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6233 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6234 DECL_INITIAL (decl1) = error_mark_node;
6236 /* If this definition isn't a prototype and we had a prototype declaration
6237 before, copy the arg type info from that prototype. */
6238 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
6239 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
6241 current_function_prototype_locus = UNKNOWN_LOCATION;
6242 current_function_prototype_built_in = false;
6243 current_function_prototype_arg_types = NULL_TREE;
6244 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6246 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6247 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6248 TREE_TYPE (TREE_TYPE (old_decl))))
6250 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
6252 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
6253 current_function_prototype_built_in
6254 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
6255 current_function_prototype_arg_types
6256 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
6258 if (TREE_PUBLIC (decl1))
6260 /* If there is an external prototype declaration of this
6261 function, record its location but do not copy information
6262 to this decl. This may be an invisible declaration
6263 (built-in or in a scope which has finished) or simply
6264 have more refined argument types than any declaration
6266 struct c_binding *b;
6267 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
6268 if (B_IN_SCOPE (b, external_scope))
6272 tree ext_decl, ext_type;
6274 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
6275 if (TREE_CODE (ext_type) == FUNCTION_TYPE
6276 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6277 TREE_TYPE (ext_type)))
6279 current_function_prototype_locus
6280 = DECL_SOURCE_LOCATION (ext_decl);
6281 current_function_prototype_built_in
6282 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
6283 current_function_prototype_arg_types
6284 = TYPE_ARG_TYPES (ext_type);
6290 /* Optionally warn of old-fashioned def with no previous prototype. */
6291 if (warn_strict_prototypes
6292 && old_decl != error_mark_node
6293 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6294 && C_DECL_ISNT_PROTOTYPE (old_decl))
6295 warning (OPT_Wstrict_prototypes,
6296 "function declaration isn%'t a prototype");
6297 /* Optionally warn of any global def with no previous prototype. */
6298 else if (warn_missing_prototypes
6299 && old_decl != error_mark_node
6300 && TREE_PUBLIC (decl1)
6301 && !MAIN_NAME_P (DECL_NAME (decl1))
6302 && C_DECL_ISNT_PROTOTYPE (old_decl))
6303 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
6304 /* Optionally warn of any def with no previous prototype
6305 if the function has already been used. */
6306 else if (warn_missing_prototypes
6308 && old_decl != error_mark_node
6309 && TREE_USED (old_decl)
6310 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6311 warning (OPT_Wmissing_prototypes,
6312 "%q+D was used with no prototype before its definition", decl1);
6313 /* Optionally warn of any global def with no previous declaration. */
6314 else if (warn_missing_declarations
6315 && TREE_PUBLIC (decl1)
6317 && !MAIN_NAME_P (DECL_NAME (decl1)))
6318 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
6320 /* Optionally warn of any def with no previous declaration
6321 if the function has already been used. */
6322 else if (warn_missing_declarations
6324 && old_decl != error_mark_node
6325 && TREE_USED (old_decl)
6326 && C_DECL_IMPLICIT (old_decl))
6327 warning (OPT_Wmissing_declarations,
6328 "%q+D was used with no declaration before its definition", decl1);
6330 /* This function exists in static storage.
6331 (This does not mean `static' in the C sense!) */
6332 TREE_STATIC (decl1) = 1;
6334 /* A nested function is not global. */
6335 if (current_function_decl != 0)
6336 TREE_PUBLIC (decl1) = 0;
6338 /* This is the earliest point at which we might know the assembler
6339 name of the function. Thus, if it's set before this, die horribly. */
6340 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
6342 /* If #pragma weak was used, mark the decl weak now. */
6343 if (current_scope == file_scope)
6344 maybe_apply_pragma_weak (decl1);
6346 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6347 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
6349 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6350 != integer_type_node)
6351 pedwarn (input_location, OPT_Wmain, "return type of %q+D is not %<int%>", decl1);
6353 check_main_parameter_types (decl1);
6355 if (!TREE_PUBLIC (decl1))
6356 pedwarn (input_location, OPT_Wmain, "%q+D is normally a non-static function", decl1);
6359 /* Record the decl so that the function name is defined.
6360 If we already have a decl for this name, and it is a FUNCTION_DECL,
6361 use the old decl. */
6363 current_function_decl = pushdecl (decl1);
6366 declare_parm_level ();
6368 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6369 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6370 DECL_ARTIFICIAL (resdecl) = 1;
6371 DECL_IGNORED_P (resdecl) = 1;
6372 DECL_RESULT (current_function_decl) = resdecl;
6374 start_fname_decls ();
6379 /* Subroutine of store_parm_decls which handles new-style function
6380 definitions (prototype format). The parms already have decls, so we
6381 need only record them as in effect and complain if any redundant
6382 old-style parm decls were written. */
6384 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6388 if (current_scope->bindings)
6390 error ("%Jold-style parameter declarations in prototyped "
6391 "function definition", fndecl);
6393 /* Get rid of the old-style declarations. */
6397 /* Don't issue this warning for nested functions, and don't issue this
6398 warning if we got here because ARG_INFO_TYPES was error_mark_node
6399 (this happens when a function definition has just an ellipsis in
6400 its parameter list). */
6401 else if (!in_system_header && !current_function_scope
6402 && arg_info->types != error_mark_node)
6403 warning (OPT_Wtraditional,
6404 "%Jtraditional C rejects ISO C style function definitions",
6407 /* Now make all the parameter declarations visible in the function body.
6408 We can bypass most of the grunt work of pushdecl. */
6409 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6411 DECL_CONTEXT (decl) = current_function_decl;
6412 if (DECL_NAME (decl))
6414 bind (DECL_NAME (decl), decl, current_scope,
6415 /*invisible=*/false, /*nested=*/false,
6417 if (!TREE_USED (decl))
6418 warn_if_shadowing (decl);
6421 error ("%Jparameter name omitted", decl);
6424 /* Record the parameter list in the function declaration. */
6425 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6427 /* Now make all the ancillary declarations visible, likewise. */
6428 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6430 DECL_CONTEXT (decl) = current_function_decl;
6431 if (DECL_NAME (decl))
6432 bind (DECL_NAME (decl), decl, current_scope,
6433 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
6436 /* And all the tag declarations. */
6437 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6438 if (TREE_PURPOSE (decl))
6439 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6440 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
6443 /* Subroutine of store_parm_decls which handles old-style function
6444 definitions (separate parameter list and declarations). */
6447 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6449 struct c_binding *b;
6450 tree parm, decl, last;
6451 tree parmids = arg_info->parms;
6452 struct pointer_set_t *seen_args = pointer_set_create ();
6454 if (!in_system_header)
6455 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6458 /* Match each formal parameter name with its declaration. Save each
6459 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6460 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6462 if (TREE_VALUE (parm) == 0)
6464 error ("%Jparameter name missing from parameter list", fndecl);
6465 TREE_PURPOSE (parm) = 0;
6469 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6470 if (b && B_IN_CURRENT_SCOPE (b))
6473 /* If we got something other than a PARM_DECL it is an error. */
6474 if (TREE_CODE (decl) != PARM_DECL)
6475 error ("%q+D declared as a non-parameter", decl);
6476 /* If the declaration is already marked, we have a duplicate
6477 name. Complain and ignore the duplicate. */
6478 else if (pointer_set_contains (seen_args, decl))
6480 error ("multiple parameters named %q+D", decl);
6481 TREE_PURPOSE (parm) = 0;
6484 /* If the declaration says "void", complain and turn it into
6486 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6488 error ("parameter %q+D declared with void type", decl);
6489 TREE_TYPE (decl) = integer_type_node;
6490 DECL_ARG_TYPE (decl) = integer_type_node;
6491 layout_decl (decl, 0);
6493 warn_if_shadowing (decl);
6495 /* If no declaration found, default to int. */
6498 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6499 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6500 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6502 warn_if_shadowing (decl);
6505 pedwarn (input_location, 0, "type of %q+D defaults to %<int%>", decl);
6507 warning (OPT_Wmissing_parameter_type, "type of %q+D defaults to %<int%>", decl);
6510 TREE_PURPOSE (parm) = decl;
6511 pointer_set_insert (seen_args, decl);
6514 /* Now examine the parms chain for incomplete declarations
6515 and declarations with no corresponding names. */
6517 for (b = current_scope->bindings; b; b = b->prev)
6520 if (TREE_CODE (parm) != PARM_DECL)
6523 if (TREE_TYPE (parm) != error_mark_node
6524 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6526 error ("parameter %q+D has incomplete type", parm);
6527 TREE_TYPE (parm) = error_mark_node;
6530 if (!pointer_set_contains (seen_args, parm))
6532 error ("declaration for parameter %q+D but no such parameter", parm);
6534 /* Pretend the parameter was not missing.
6535 This gets us to a standard state and minimizes
6536 further error messages. */
6537 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6541 /* Chain the declarations together in the order of the list of
6542 names. Store that chain in the function decl, replacing the
6543 list of names. Update the current scope to match. */
6544 DECL_ARGUMENTS (fndecl) = 0;
6546 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6547 if (TREE_PURPOSE (parm))
6549 if (parm && TREE_PURPOSE (parm))
6551 last = TREE_PURPOSE (parm);
6552 DECL_ARGUMENTS (fndecl) = last;
6554 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6555 if (TREE_PURPOSE (parm))
6557 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6558 last = TREE_PURPOSE (parm);
6560 TREE_CHAIN (last) = 0;
6563 pointer_set_destroy (seen_args);
6565 /* If there was a previous prototype,
6566 set the DECL_ARG_TYPE of each argument according to
6567 the type previously specified, and report any mismatches. */
6569 if (current_function_prototype_arg_types)
6572 for (parm = DECL_ARGUMENTS (fndecl),
6573 type = current_function_prototype_arg_types;
6574 parm || (type && TREE_VALUE (type) != error_mark_node
6575 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
6576 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6578 if (parm == 0 || type == 0
6579 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6581 if (current_function_prototype_built_in)
6582 warning (0, "number of arguments doesn%'t match "
6583 "built-in prototype");
6586 error ("number of arguments doesn%'t match prototype");
6587 error ("%Hprototype declaration",
6588 ¤t_function_prototype_locus);
6592 /* Type for passing arg must be consistent with that
6593 declared for the arg. ISO C says we take the unqualified
6594 type for parameters declared with qualified type. */
6595 if (TREE_TYPE (parm) != error_mark_node
6596 && TREE_TYPE (type) != error_mark_node
6597 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6598 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6600 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6601 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6603 /* Adjust argument to match prototype. E.g. a previous
6604 `int foo(float);' prototype causes
6605 `int foo(x) float x; {...}' to be treated like
6606 `int foo(float x) {...}'. This is particularly
6607 useful for argument types like uid_t. */
6608 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6610 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6611 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6612 && TYPE_PRECISION (TREE_TYPE (parm))
6613 < TYPE_PRECISION (integer_type_node))
6614 DECL_ARG_TYPE (parm) = integer_type_node;
6616 /* ??? Is it possible to get here with a
6617 built-in prototype or will it always have
6618 been diagnosed as conflicting with an
6619 old-style definition and discarded? */
6620 if (current_function_prototype_built_in)
6621 warning (OPT_pedantic, "promoted argument %qD "
6622 "doesn%'t match built-in prototype", parm);
6625 pedwarn (input_location, OPT_pedantic, "promoted argument %qD "
6626 "doesn%'t match prototype", parm);
6627 pedwarn (current_function_prototype_locus, OPT_pedantic,
6628 "prototype declaration");
6633 if (current_function_prototype_built_in)
6634 warning (0, "argument %qD doesn%'t match "
6635 "built-in prototype", parm);
6638 error ("argument %qD doesn%'t match prototype", parm);
6639 error ("%Hprototype declaration",
6640 ¤t_function_prototype_locus);
6645 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6648 /* Otherwise, create a prototype that would match. */
6652 tree actual = 0, last = 0, type;
6654 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6656 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6658 TREE_CHAIN (last) = type;
6663 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6665 TREE_CHAIN (last) = type;
6669 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6670 of the type of this function, but we need to avoid having this
6671 affect the types of other similarly-typed functions, so we must
6672 first force the generation of an identical (but separate) type
6673 node for the relevant function type. The new node we create
6674 will be a variant of the main variant of the original function
6677 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6679 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6683 /* Store parameter declarations passed in ARG_INFO into the current
6684 function declaration. */
6687 store_parm_decls_from (struct c_arg_info *arg_info)
6689 current_function_arg_info = arg_info;
6690 store_parm_decls ();
6693 /* Store the parameter declarations into the current function declaration.
6694 This is called after parsing the parameter declarations, before
6695 digesting the body of the function.
6697 For an old-style definition, construct a prototype out of the old-style
6698 parameter declarations and inject it into the function's type. */
6701 store_parm_decls (void)
6703 tree fndecl = current_function_decl;
6706 /* The argument information block for FNDECL. */
6707 struct c_arg_info *arg_info = current_function_arg_info;
6708 current_function_arg_info = 0;
6710 /* True if this definition is written with a prototype. Note:
6711 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6712 list in a function definition as equivalent to (void) -- an
6713 empty argument list specifies the function has no parameters,
6714 but only (void) sets up a prototype for future calls. */
6715 proto = arg_info->types != 0;
6718 store_parm_decls_newstyle (fndecl, arg_info);
6720 store_parm_decls_oldstyle (fndecl, arg_info);
6722 /* The next call to push_scope will be a function body. */
6724 next_is_function_body = true;
6726 /* Write a record describing this function definition to the prototypes
6727 file (if requested). */
6729 gen_aux_info_record (fndecl, 1, 0, proto);
6731 /* Initialize the RTL code for the function. */
6732 allocate_struct_function (fndecl, false);
6734 /* Begin the statement tree for this function. */
6735 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6737 /* ??? Insert the contents of the pending sizes list into the function
6738 to be evaluated. The only reason left to have this is
6739 void foo(int n, int array[n++])
6740 because we throw away the array type in favor of a pointer type, and
6741 thus won't naturally see the SAVE_EXPR containing the increment. All
6742 other pending sizes would be handled by gimplify_parameters. */
6745 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6746 add_stmt (TREE_VALUE (t));
6749 /* Even though we're inside a function body, we still don't want to
6750 call expand_expr to calculate the size of a variable-sized array.
6751 We haven't necessarily assigned RTL to all variables yet, so it's
6752 not safe to try to expand expressions involving them. */
6753 cfun->dont_save_pending_sizes_p = 1;
6756 /* Emit diagnostics that require gimple input for detection. Operate on
6757 FNDECL and all its nested functions. */
6760 c_gimple_diagnostics_recursively (tree fndecl)
6762 struct cgraph_node *cgn;
6763 gimple_seq body = gimple_body (fndecl);
6765 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6766 c_warn_unused_result (body);
6768 /* Notice when OpenMP structured block constraints are violated. */
6770 diagnose_omp_structured_block_errors (fndecl);
6772 /* Finalize all nested functions now. */
6773 cgn = cgraph_node (fndecl);
6774 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6775 c_gimple_diagnostics_recursively (cgn->decl);
6778 /* Finish up a function declaration and compile that function
6779 all the way to assembler language output. The free the storage
6780 for the function definition.
6782 This is called after parsing the body of the function definition. */
6785 finish_function (void)
6787 tree fndecl = current_function_decl;
6789 label_context_stack_se = label_context_stack_se->next;
6790 label_context_stack_vm = label_context_stack_vm->next;
6792 if (TREE_CODE (fndecl) == FUNCTION_DECL
6793 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6795 tree args = DECL_ARGUMENTS (fndecl);
6796 for (; args; args = TREE_CHAIN (args))
6798 tree type = TREE_TYPE (args);
6799 if (INTEGRAL_TYPE_P (type)
6800 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6801 DECL_ARG_TYPE (args) = integer_type_node;
6805 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6806 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6808 /* Must mark the RESULT_DECL as being in this function. */
6810 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6811 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6813 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
6814 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6815 == integer_type_node && flag_isoc99)
6817 tree stmt = c_finish_return (integer_zero_node);
6818 /* Hack. We don't want the middle-end to warn that this return
6819 is unreachable, so we mark its location as special. Using
6820 UNKNOWN_LOCATION has the problem that it gets clobbered in
6821 annotate_one_with_locus. A cleaner solution might be to
6822 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6824 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6827 /* Tie off the statement tree for this function. */
6828 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6830 finish_fname_decls ();
6832 /* Complain if there's just no return statement. */
6833 if (warn_return_type
6834 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6835 && !current_function_returns_value && !current_function_returns_null
6836 /* Don't complain if we are no-return. */
6837 && !current_function_returns_abnormally
6838 /* Don't warn for main(). */
6839 && !MAIN_NAME_P (DECL_NAME (fndecl))
6840 /* Or if they didn't actually specify a return type. */
6841 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6842 /* Normally, with -Wreturn-type, flow will complain, but we might
6843 optimize out static functions. */
6844 && !TREE_PUBLIC (fndecl))
6846 warning (OPT_Wreturn_type,
6847 "no return statement in function returning non-void");
6848 TREE_NO_WARNING (fndecl) = 1;
6851 /* Store the end of the function, so that we get good line number
6852 info for the epilogue. */
6853 cfun->function_end_locus = input_location;
6855 /* Finalize the ELF visibility for the function. */
6856 c_determine_visibility (fndecl);
6858 /* For GNU C extern inline functions disregard inline limits. */
6859 if (DECL_EXTERNAL (fndecl)
6860 && DECL_DECLARED_INLINE_P (fndecl))
6861 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
6863 /* Genericize before inlining. Delay genericizing nested functions
6864 until their parent function is genericized. Since finalizing
6865 requires GENERIC, delay that as well. */
6867 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6868 && !undef_nested_function)
6870 if (!decl_function_context (fndecl))
6872 c_genericize (fndecl);
6873 c_gimple_diagnostics_recursively (fndecl);
6875 /* ??? Objc emits functions after finalizing the compilation unit.
6876 This should be cleaned up later and this conditional removed. */
6877 if (cgraph_global_info_ready)
6879 cgraph_add_new_function (fndecl, false);
6883 cgraph_finalize_function (fndecl, false);
6887 /* Register this function with cgraph just far enough to get it
6888 added to our parent's nested function list. Handy, since the
6889 C front end doesn't have such a list. */
6890 (void) cgraph_node (fndecl);
6894 if (!decl_function_context (fndecl))
6895 undef_nested_function = false;
6897 /* We're leaving the context of this function, so zap cfun.
6898 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6899 tree_rest_of_compilation. */
6901 current_function_decl = NULL;
6904 /* Check the declarations given in a for-loop for satisfying the C99
6905 constraints. If exactly one such decl is found, return it. */
6908 check_for_loop_decls (void)
6910 struct c_binding *b;
6911 tree one_decl = NULL_TREE;
6916 static bool hint = true;
6917 /* If we get here, declarations have been used in a for loop without
6918 the C99 for loop scope. This doesn't make much sense, so don't
6920 error ("%<for%> loop initial declarations are only allowed in C99 mode");
6923 inform (input_location,
6924 "use option -std=c99 or -std=gnu99 to compile your code");
6929 /* C99 subclause 6.8.5 paragraph 3:
6931 [#3] The declaration part of a for statement shall only
6932 declare identifiers for objects having storage class auto or
6935 It isn't clear whether, in this sentence, "identifiers" binds to
6936 "shall only declare" or to "objects" - that is, whether all identifiers
6937 declared must be identifiers for objects, or whether the restriction
6938 only applies to those that are. (A question on this in comp.std.c
6939 in November 2000 received no answer.) We implement the strictest
6940 interpretation, to avoid creating an extension which later causes
6943 for (b = current_scope->bindings; b; b = b->prev)
6946 tree decl = b->decl;
6951 switch (TREE_CODE (decl))
6954 if (TREE_STATIC (decl))
6955 error ("declaration of static variable %q+D in %<for%> loop "
6956 "initial declaration", decl);
6957 else if (DECL_EXTERNAL (decl))
6958 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6959 "initial declaration", decl);
6963 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6967 error ("%<union %E%> declared in %<for%> loop initial declaration",
6971 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6975 error ("declaration of non-variable %q+D in %<for%> loop "
6976 "initial declaration", decl);
6983 return n_decls == 1 ? one_decl : NULL_TREE;
6986 /* Save and reinitialize the variables
6987 used during compilation of a C function. */
6990 c_push_function_context (void)
6992 struct language_function *p;
6993 p = GGC_NEW (struct language_function);
6996 p->base.x_stmt_tree = c_stmt_tree;
6997 p->x_break_label = c_break_label;
6998 p->x_cont_label = c_cont_label;
6999 p->x_switch_stack = c_switch_stack;
7000 p->arg_info = current_function_arg_info;
7001 p->returns_value = current_function_returns_value;
7002 p->returns_null = current_function_returns_null;
7003 p->returns_abnormally = current_function_returns_abnormally;
7004 p->warn_about_return_type = warn_about_return_type;
7006 push_function_context ();
7009 /* Restore the variables used during compilation of a C function. */
7012 c_pop_function_context (void)
7014 struct language_function *p;
7016 pop_function_context ();
7018 cfun->language = NULL;
7020 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
7021 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7023 /* Stop pointing to the local nodes about to be freed. */
7024 /* But DECL_INITIAL must remain nonzero so we know this
7025 was an actual function definition. */
7026 DECL_INITIAL (current_function_decl) = error_mark_node;
7027 DECL_ARGUMENTS (current_function_decl) = 0;
7030 c_stmt_tree = p->base.x_stmt_tree;
7031 c_break_label = p->x_break_label;
7032 c_cont_label = p->x_cont_label;
7033 c_switch_stack = p->x_switch_stack;
7034 current_function_arg_info = p->arg_info;
7035 current_function_returns_value = p->returns_value;
7036 current_function_returns_null = p->returns_null;
7037 current_function_returns_abnormally = p->returns_abnormally;
7038 warn_about_return_type = p->warn_about_return_type;
7041 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
7044 c_dup_lang_specific_decl (tree decl)
7046 struct lang_decl *ld;
7048 if (!DECL_LANG_SPECIFIC (decl))
7051 ld = GGC_NEW (struct lang_decl);
7052 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
7053 DECL_LANG_SPECIFIC (decl) = ld;
7056 /* The functions below are required for functionality of doing
7057 function at once processing in the C front end. Currently these
7058 functions are not called from anywhere in the C front end, but as
7059 these changes continue, that will change. */
7061 /* Returns the stmt_tree (if any) to which statements are currently
7062 being added. If there is no active statement-tree, NULL is
7066 current_stmt_tree (void)
7068 return &c_stmt_tree;
7071 /* Return the global value of T as a symbol. */
7074 identifier_global_value (tree t)
7076 struct c_binding *b;
7078 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
7079 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
7085 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7086 otherwise the name is found in ridpointers from RID_INDEX. */
7089 record_builtin_type (enum rid rid_index, const char *name, tree type)
7093 id = ridpointers[(int) rid_index];
7095 id = get_identifier (name);
7096 decl = build_decl (TYPE_DECL, id, type);
7098 if (debug_hooks->type_decl)
7099 debug_hooks->type_decl (decl, false);
7102 /* Build the void_list_node (void_type_node having been created). */
7104 build_void_list_node (void)
7106 tree t = build_tree_list (NULL_TREE, void_type_node);
7110 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
7113 build_c_parm (struct c_declspecs *specs, tree attrs,
7114 struct c_declarator *declarator)
7116 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
7119 ret->declarator = declarator;
7123 /* Return a declarator with nested attributes. TARGET is the inner
7124 declarator to which these attributes apply. ATTRS are the
7127 struct c_declarator *
7128 build_attrs_declarator (tree attrs, struct c_declarator *target)
7130 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7131 ret->kind = cdk_attrs;
7132 ret->declarator = target;
7133 ret->u.attrs = attrs;
7137 /* Return a declarator for a function with arguments specified by ARGS
7138 and return type specified by TARGET. */
7140 struct c_declarator *
7141 build_function_declarator (struct c_arg_info *args,
7142 struct c_declarator *target)
7144 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7145 ret->kind = cdk_function;
7146 ret->declarator = target;
7147 ret->u.arg_info = args;
7151 /* Return a declarator for the identifier IDENT (which may be
7152 NULL_TREE for an abstract declarator). */
7154 struct c_declarator *
7155 build_id_declarator (tree ident)
7157 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7159 ret->declarator = 0;
7161 /* Default value - may get reset to a more precise location. */
7162 ret->id_loc = input_location;
7166 /* Return something to represent absolute declarators containing a *.
7167 TARGET is the absolute declarator that the * contains.
7168 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
7169 to apply to the pointer type. */
7171 struct c_declarator *
7172 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
7173 struct c_declarator *target)
7177 struct c_declarator *itarget = target;
7178 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7179 if (type_quals_attrs)
7181 attrs = type_quals_attrs->attrs;
7182 quals = quals_from_declspecs (type_quals_attrs);
7183 if (attrs != NULL_TREE)
7184 itarget = build_attrs_declarator (attrs, target);
7186 ret->kind = cdk_pointer;
7187 ret->declarator = itarget;
7188 ret->u.pointer_quals = quals;
7192 /* Return a pointer to a structure for an empty list of declaration
7195 struct c_declspecs *
7196 build_null_declspecs (void)
7198 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
7203 ret->typespec_word = cts_none;
7204 ret->storage_class = csc_none;
7205 ret->expr_const_operands = true;
7206 ret->declspecs_seen_p = false;
7207 ret->type_seen_p = false;
7208 ret->non_sc_seen_p = false;
7209 ret->typedef_p = false;
7210 ret->tag_defined_p = false;
7211 ret->explicit_signed_p = false;
7212 ret->deprecated_p = false;
7213 ret->default_int_p = false;
7214 ret->long_p = false;
7215 ret->long_long_p = false;
7216 ret->short_p = false;
7217 ret->signed_p = false;
7218 ret->unsigned_p = false;
7219 ret->complex_p = false;
7220 ret->inline_p = false;
7221 ret->thread_p = false;
7222 ret->const_p = false;
7223 ret->volatile_p = false;
7224 ret->restrict_p = false;
7225 ret->saturating_p = false;
7229 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
7232 struct c_declspecs *
7233 declspecs_add_qual (struct c_declspecs *specs, tree qual)
7237 specs->non_sc_seen_p = true;
7238 specs->declspecs_seen_p = true;
7239 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
7240 && C_IS_RESERVED_WORD (qual));
7241 i = C_RID_CODE (qual);
7245 dupe = specs->const_p;
7246 specs->const_p = true;
7249 dupe = specs->volatile_p;
7250 specs->volatile_p = true;
7253 dupe = specs->restrict_p;
7254 specs->restrict_p = true;
7259 if (dupe && !flag_isoc99)
7260 pedwarn (input_location, OPT_pedantic, "duplicate %qE", qual);
7264 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7267 struct c_declspecs *
7268 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
7270 tree type = spec.spec;
7271 specs->non_sc_seen_p = true;
7272 specs->declspecs_seen_p = true;
7273 specs->type_seen_p = true;
7274 if (TREE_DEPRECATED (type))
7275 specs->deprecated_p = true;
7277 /* Handle type specifier keywords. */
7278 if (TREE_CODE (type) == IDENTIFIER_NODE
7279 && C_IS_RESERVED_WORD (type)
7280 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
7282 enum rid i = C_RID_CODE (type);
7285 error ("two or more data types in declaration specifiers");
7288 if ((int) i <= (int) RID_LAST_MODIFIER)
7290 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
7295 if (specs->long_long_p)
7297 error ("%<long long long%> is too long for GCC");
7302 if (specs->typespec_word == cts_double)
7304 error ("both %<long long%> and %<double%> in "
7305 "declaration specifiers");
7308 if (pedantic && !flag_isoc99 && !in_system_header)
7309 pedwarn (input_location, OPT_Wlong_long, "ISO C90 does not support %<long long%>");
7310 specs->long_long_p = 1;
7314 error ("both %<long%> and %<short%> in "
7315 "declaration specifiers");
7316 else if (specs->typespec_word == cts_void)
7317 error ("both %<long%> and %<void%> in "
7318 "declaration specifiers");
7319 else if (specs->typespec_word == cts_bool)
7320 error ("both %<long%> and %<_Bool%> in "
7321 "declaration specifiers");
7322 else if (specs->typespec_word == cts_char)
7323 error ("both %<long%> and %<char%> in "
7324 "declaration specifiers");
7325 else if (specs->typespec_word == cts_float)
7326 error ("both %<long%> and %<float%> in "
7327 "declaration specifiers");
7328 else if (specs->typespec_word == cts_dfloat32)
7329 error ("both %<long%> and %<_Decimal32%> in "
7330 "declaration specifiers");
7331 else if (specs->typespec_word == cts_dfloat64)
7332 error ("both %<long%> and %<_Decimal64%> in "
7333 "declaration specifiers");
7334 else if (specs->typespec_word == cts_dfloat128)
7335 error ("both %<long%> and %<_Decimal128%> in "
7336 "declaration specifiers");
7338 specs->long_p = true;
7341 dupe = specs->short_p;
7343 error ("both %<long%> and %<short%> in "
7344 "declaration specifiers");
7345 else if (specs->typespec_word == cts_void)
7346 error ("both %<short%> and %<void%> in "
7347 "declaration specifiers");
7348 else if (specs->typespec_word == cts_bool)
7349 error ("both %<short%> and %<_Bool%> in "
7350 "declaration specifiers");
7351 else if (specs->typespec_word == cts_char)
7352 error ("both %<short%> and %<char%> in "
7353 "declaration specifiers");
7354 else if (specs->typespec_word == cts_float)
7355 error ("both %<short%> and %<float%> in "
7356 "declaration specifiers");
7357 else if (specs->typespec_word == cts_double)
7358 error ("both %<short%> and %<double%> in "
7359 "declaration specifiers");
7360 else if (specs->typespec_word == cts_dfloat32)
7361 error ("both %<short%> and %<_Decimal32%> in "
7362 "declaration specifiers");
7363 else if (specs->typespec_word == cts_dfloat64)
7364 error ("both %<short%> and %<_Decimal64%> in "
7365 "declaration specifiers");
7366 else if (specs->typespec_word == cts_dfloat128)
7367 error ("both %<short%> and %<_Decimal128%> in "
7368 "declaration specifiers");
7370 specs->short_p = true;
7373 dupe = specs->signed_p;
7374 if (specs->unsigned_p)
7375 error ("both %<signed%> and %<unsigned%> in "
7376 "declaration specifiers");
7377 else if (specs->typespec_word == cts_void)
7378 error ("both %<signed%> and %<void%> in "
7379 "declaration specifiers");
7380 else if (specs->typespec_word == cts_bool)
7381 error ("both %<signed%> and %<_Bool%> in "
7382 "declaration specifiers");
7383 else if (specs->typespec_word == cts_float)
7384 error ("both %<signed%> and %<float%> in "
7385 "declaration specifiers");
7386 else if (specs->typespec_word == cts_double)
7387 error ("both %<signed%> and %<double%> in "
7388 "declaration specifiers");
7389 else if (specs->typespec_word == cts_dfloat32)
7390 error ("both %<signed%> and %<_Decimal32%> in "
7391 "declaration specifiers");
7392 else if (specs->typespec_word == cts_dfloat64)
7393 error ("both %<signed%> and %<_Decimal64%> in "
7394 "declaration specifiers");
7395 else if (specs->typespec_word == cts_dfloat128)
7396 error ("both %<signed%> and %<_Decimal128%> in "
7397 "declaration specifiers");
7399 specs->signed_p = true;
7402 dupe = specs->unsigned_p;
7403 if (specs->signed_p)
7404 error ("both %<signed%> and %<unsigned%> in "
7405 "declaration specifiers");
7406 else if (specs->typespec_word == cts_void)
7407 error ("both %<unsigned%> and %<void%> in "
7408 "declaration specifiers");
7409 else if (specs->typespec_word == cts_bool)
7410 error ("both %<unsigned%> and %<_Bool%> in "
7411 "declaration specifiers");
7412 else if (specs->typespec_word == cts_float)
7413 error ("both %<unsigned%> and %<float%> in "
7414 "declaration specifiers");
7415 else if (specs->typespec_word == cts_double)
7416 error ("both %<unsigned%> and %<double%> in "
7417 "declaration specifiers");
7418 else if (specs->typespec_word == cts_dfloat32)
7419 error ("both %<unsigned%> and %<_Decimal32%> in "
7420 "declaration specifiers");
7421 else if (specs->typespec_word == cts_dfloat64)
7422 error ("both %<unsigned%> and %<_Decimal64%> in "
7423 "declaration specifiers");
7424 else if (specs->typespec_word == cts_dfloat128)
7425 error ("both %<unsigned%> and %<_Decimal128%> in "
7426 "declaration specifiers");
7428 specs->unsigned_p = true;
7431 dupe = specs->complex_p;
7432 if (!flag_isoc99 && !in_system_header)
7433 pedwarn (input_location, OPT_pedantic, "ISO C90 does not support complex types");
7434 if (specs->typespec_word == cts_void)
7435 error ("both %<complex%> and %<void%> in "
7436 "declaration specifiers");
7437 else if (specs->typespec_word == cts_bool)
7438 error ("both %<complex%> and %<_Bool%> in "
7439 "declaration specifiers");
7440 else if (specs->typespec_word == cts_dfloat32)
7441 error ("both %<complex%> and %<_Decimal32%> in "
7442 "declaration specifiers");
7443 else if (specs->typespec_word == cts_dfloat64)
7444 error ("both %<complex%> and %<_Decimal64%> in "
7445 "declaration specifiers");
7446 else if (specs->typespec_word == cts_dfloat128)
7447 error ("both %<complex%> and %<_Decimal128%> in "
7448 "declaration specifiers");
7449 else if (specs->typespec_word == cts_fract)
7450 error ("both %<complex%> and %<_Fract%> in "
7451 "declaration specifiers");
7452 else if (specs->typespec_word == cts_accum)
7453 error ("both %<complex%> and %<_Accum%> in "
7454 "declaration specifiers");
7455 else if (specs->saturating_p)
7456 error ("both %<complex%> and %<_Sat%> in "
7457 "declaration specifiers");
7459 specs->complex_p = true;
7462 dupe = specs->saturating_p;
7463 pedwarn (input_location, OPT_pedantic, "ISO C does not support saturating types");
7464 if (specs->typespec_word == cts_void)
7465 error ("both %<_Sat%> and %<void%> in "
7466 "declaration specifiers");
7467 else if (specs->typespec_word == cts_bool)
7468 error ("both %<_Sat%> and %<_Bool%> in "
7469 "declaration specifiers");
7470 else if (specs->typespec_word == cts_char)
7471 error ("both %<_Sat%> and %<char%> in "
7472 "declaration specifiers");
7473 else if (specs->typespec_word == cts_int)
7474 error ("both %<_Sat%> and %<int%> in "
7475 "declaration specifiers");
7476 else if (specs->typespec_word == cts_float)
7477 error ("both %<_Sat%> and %<float%> in "
7478 "declaration specifiers");
7479 else if (specs->typespec_word == cts_double)
7480 error ("both %<_Sat%> and %<double%> in "
7481 "declaration specifiers");
7482 else if (specs->typespec_word == cts_dfloat32)
7483 error ("both %<_Sat%> and %<_Decimal32%> in "
7484 "declaration specifiers");
7485 else if (specs->typespec_word == cts_dfloat64)
7486 error ("both %<_Sat%> and %<_Decimal64%> in "
7487 "declaration specifiers");
7488 else if (specs->typespec_word == cts_dfloat128)
7489 error ("both %<_Sat%> and %<_Decimal128%> in "
7490 "declaration specifiers");
7491 else if (specs->complex_p)
7492 error ("both %<_Sat%> and %<complex%> in "
7493 "declaration specifiers");
7495 specs->saturating_p = true;
7502 error ("duplicate %qE", type);
7508 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
7509 "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
7510 if (specs->typespec_word != cts_none)
7512 error ("two or more data types in declaration specifiers");
7519 error ("both %<long%> and %<void%> in "
7520 "declaration specifiers");
7521 else if (specs->short_p)
7522 error ("both %<short%> and %<void%> in "
7523 "declaration specifiers");
7524 else if (specs->signed_p)
7525 error ("both %<signed%> and %<void%> in "
7526 "declaration specifiers");
7527 else if (specs->unsigned_p)
7528 error ("both %<unsigned%> and %<void%> in "
7529 "declaration specifiers");
7530 else if (specs->complex_p)
7531 error ("both %<complex%> and %<void%> in "
7532 "declaration specifiers");
7533 else if (specs->saturating_p)
7534 error ("both %<_Sat%> and %<void%> in "
7535 "declaration specifiers");
7537 specs->typespec_word = cts_void;
7541 error ("both %<long%> and %<_Bool%> in "
7542 "declaration specifiers");
7543 else if (specs->short_p)
7544 error ("both %<short%> and %<_Bool%> in "
7545 "declaration specifiers");
7546 else if (specs->signed_p)
7547 error ("both %<signed%> and %<_Bool%> in "
7548 "declaration specifiers");
7549 else if (specs->unsigned_p)
7550 error ("both %<unsigned%> and %<_Bool%> in "
7551 "declaration specifiers");
7552 else if (specs->complex_p)
7553 error ("both %<complex%> and %<_Bool%> in "
7554 "declaration specifiers");
7555 else if (specs->saturating_p)
7556 error ("both %<_Sat%> and %<_Bool%> in "
7557 "declaration specifiers");
7559 specs->typespec_word = cts_bool;
7563 error ("both %<long%> and %<char%> in "
7564 "declaration specifiers");
7565 else if (specs->short_p)
7566 error ("both %<short%> and %<char%> in "
7567 "declaration specifiers");
7568 else if (specs->saturating_p)
7569 error ("both %<_Sat%> and %<char%> in "
7570 "declaration specifiers");
7572 specs->typespec_word = cts_char;
7575 if (specs->saturating_p)
7576 error ("both %<_Sat%> and %<int%> in "
7577 "declaration specifiers");
7579 specs->typespec_word = cts_int;
7583 error ("both %<long%> and %<float%> in "
7584 "declaration specifiers");
7585 else if (specs->short_p)
7586 error ("both %<short%> and %<float%> in "
7587 "declaration specifiers");
7588 else if (specs->signed_p)
7589 error ("both %<signed%> and %<float%> in "
7590 "declaration specifiers");
7591 else if (specs->unsigned_p)
7592 error ("both %<unsigned%> and %<float%> in "
7593 "declaration specifiers");
7594 else if (specs->saturating_p)
7595 error ("both %<_Sat%> and %<float%> in "
7596 "declaration specifiers");
7598 specs->typespec_word = cts_float;
7601 if (specs->long_long_p)
7602 error ("both %<long long%> and %<double%> in "
7603 "declaration specifiers");
7604 else if (specs->short_p)
7605 error ("both %<short%> and %<double%> in "
7606 "declaration specifiers");
7607 else if (specs->signed_p)
7608 error ("both %<signed%> and %<double%> in "
7609 "declaration specifiers");
7610 else if (specs->unsigned_p)
7611 error ("both %<unsigned%> and %<double%> in "
7612 "declaration specifiers");
7613 else if (specs->saturating_p)
7614 error ("both %<_Sat%> and %<double%> in "
7615 "declaration specifiers");
7617 specs->typespec_word = cts_double;
7624 if (i == RID_DFLOAT32)
7626 else if (i == RID_DFLOAT64)
7629 str = "_Decimal128";
7630 if (specs->long_long_p)
7631 error ("both %<long long%> and %<%s%> in "
7632 "declaration specifiers", str);
7634 error ("both %<long%> and %<%s%> in "
7635 "declaration specifiers", str);
7636 else if (specs->short_p)
7637 error ("both %<short%> and %<%s%> in "
7638 "declaration specifiers", str);
7639 else if (specs->signed_p)
7640 error ("both %<signed%> and %<%s%> in "
7641 "declaration specifiers", str);
7642 else if (specs->unsigned_p)
7643 error ("both %<unsigned%> and %<%s%> in "
7644 "declaration specifiers", str);
7645 else if (specs->complex_p)
7646 error ("both %<complex%> and %<%s%> in "
7647 "declaration specifiers", str);
7648 else if (specs->saturating_p)
7649 error ("both %<_Sat%> and %<%s%> in "
7650 "declaration specifiers", str);
7651 else if (i == RID_DFLOAT32)
7652 specs->typespec_word = cts_dfloat32;
7653 else if (i == RID_DFLOAT64)
7654 specs->typespec_word = cts_dfloat64;
7656 specs->typespec_word = cts_dfloat128;
7658 if (!targetm.decimal_float_supported_p ())
7659 error ("decimal floating point not supported for this target");
7660 pedwarn (input_location, OPT_pedantic,
7661 "ISO C does not support decimal floating point");
7671 if (specs->complex_p)
7672 error ("both %<complex%> and %<%s%> in "
7673 "declaration specifiers", str);
7674 else if (i == RID_FRACT)
7675 specs->typespec_word = cts_fract;
7677 specs->typespec_word = cts_accum;
7679 if (!targetm.fixed_point_supported_p ())
7680 error ("fixed-point types not supported for this target");
7681 pedwarn (input_location, OPT_pedantic,
7682 "ISO C does not support fixed-point types");
7685 /* ObjC reserved word "id", handled below. */
7691 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7692 form of ObjC type, cases such as "int" and "long" being handled
7693 above), a TYPE (struct, union, enum and typeof specifiers) or an
7694 ERROR_MARK. In none of these cases may there have previously
7695 been any type specifiers. */
7696 if (specs->type || specs->typespec_word != cts_none
7697 || specs->long_p || specs->short_p || specs->signed_p
7698 || specs->unsigned_p || specs->complex_p)
7699 error ("two or more data types in declaration specifiers");
7700 else if (TREE_CODE (type) == TYPE_DECL)
7702 if (TREE_TYPE (type) == error_mark_node)
7703 ; /* Allow the type to default to int to avoid cascading errors. */
7706 specs->type = TREE_TYPE (type);
7707 specs->decl_attr = DECL_ATTRIBUTES (type);
7708 specs->typedef_p = true;
7709 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7712 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7714 tree t = lookup_name (type);
7715 if (!t || TREE_CODE (t) != TYPE_DECL)
7716 error ("%qE fails to be a typedef or built in type", type);
7717 else if (TREE_TYPE (t) == error_mark_node)
7720 specs->type = TREE_TYPE (t);
7722 else if (TREE_CODE (type) != ERROR_MARK)
7724 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7725 specs->tag_defined_p = true;
7726 if (spec.kind == ctsk_typeof)
7728 specs->typedef_p = true;
7732 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
7733 specs->expr, spec.expr);
7735 specs->expr = spec.expr;
7736 specs->expr_const_operands &= spec.expr_const_operands;
7745 /* Add the storage class specifier or function specifier SCSPEC to the
7746 declaration specifiers SPECS, returning SPECS. */
7748 struct c_declspecs *
7749 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7752 enum c_storage_class n = csc_none;
7754 specs->declspecs_seen_p = true;
7755 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7756 && C_IS_RESERVED_WORD (scspec));
7757 i = C_RID_CODE (scspec);
7758 if (specs->non_sc_seen_p)
7759 warning (OPT_Wold_style_declaration,
7760 "%qE is not at beginning of declaration", scspec);
7764 /* C99 permits duplicate inline. Although of doubtful utility,
7765 it seems simplest to permit it in gnu89 mode as well, as
7766 there is also little utility in maintaining this as a
7767 difference between gnu89 and C99 inline. */
7769 specs->inline_p = true;
7772 dupe = specs->thread_p;
7773 if (specs->storage_class == csc_auto)
7774 error ("%<__thread%> used with %<auto%>");
7775 else if (specs->storage_class == csc_register)
7776 error ("%<__thread%> used with %<register%>");
7777 else if (specs->storage_class == csc_typedef)
7778 error ("%<__thread%> used with %<typedef%>");
7780 specs->thread_p = true;
7787 /* Diagnose "__thread extern". */
7788 if (specs->thread_p)
7789 error ("%<__thread%> before %<extern%>");
7796 /* Diagnose "__thread static". */
7797 if (specs->thread_p)
7798 error ("%<__thread%> before %<static%>");
7806 if (n != csc_none && n == specs->storage_class)
7809 error ("duplicate %qE", scspec);
7812 if (specs->storage_class != csc_none && n != specs->storage_class)
7814 error ("multiple storage classes in declaration specifiers");
7818 specs->storage_class = n;
7819 if (n != csc_extern && n != csc_static && specs->thread_p)
7821 error ("%<__thread%> used with %qE", scspec);
7822 specs->thread_p = false;
7829 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7832 struct c_declspecs *
7833 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7835 specs->attrs = chainon (attrs, specs->attrs);
7836 specs->declspecs_seen_p = true;
7840 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7841 specifiers with any other type specifier to determine the resulting
7842 type. This is where ISO C checks on complex types are made, since
7843 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7846 struct c_declspecs *
7847 finish_declspecs (struct c_declspecs *specs)
7849 /* If a type was specified as a whole, we have no modifiers and are
7851 if (specs->type != NULL_TREE)
7853 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7854 && !specs->signed_p && !specs->unsigned_p
7855 && !specs->complex_p);
7859 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7860 has been specified, treat it as "int" unless "_Complex" is
7861 present and there are no other specifiers. If we just have
7862 "_Complex", it is equivalent to "_Complex double", but e.g.
7863 "_Complex short" is equivalent to "_Complex short int". */
7864 if (specs->typespec_word == cts_none)
7866 if (specs->saturating_p)
7868 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
7869 if (!targetm.fixed_point_supported_p ())
7870 error ("fixed-point types not supported for this target");
7871 specs->typespec_word = cts_fract;
7873 else if (specs->long_p || specs->short_p
7874 || specs->signed_p || specs->unsigned_p)
7876 specs->typespec_word = cts_int;
7878 else if (specs->complex_p)
7880 specs->typespec_word = cts_double;
7881 pedwarn (input_location, OPT_pedantic,
7882 "ISO C does not support plain %<complex%> meaning "
7883 "%<double complex%>");
7887 specs->typespec_word = cts_int;
7888 specs->default_int_p = true;
7889 /* We don't diagnose this here because grokdeclarator will
7890 give more specific diagnostics according to whether it is
7891 a function definition. */
7895 /* If "signed" was specified, record this to distinguish "int" and
7896 "signed int" in the case of a bit-field with
7897 -funsigned-bitfields. */
7898 specs->explicit_signed_p = specs->signed_p;
7900 /* Now compute the actual type. */
7901 switch (specs->typespec_word)
7904 gcc_assert (!specs->long_p && !specs->short_p
7905 && !specs->signed_p && !specs->unsigned_p
7906 && !specs->complex_p);
7907 specs->type = void_type_node;
7910 gcc_assert (!specs->long_p && !specs->short_p
7911 && !specs->signed_p && !specs->unsigned_p
7912 && !specs->complex_p);
7913 specs->type = boolean_type_node;
7916 gcc_assert (!specs->long_p && !specs->short_p);
7917 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7918 if (specs->signed_p)
7919 specs->type = signed_char_type_node;
7920 else if (specs->unsigned_p)
7921 specs->type = unsigned_char_type_node;
7923 specs->type = char_type_node;
7924 if (specs->complex_p)
7926 pedwarn (input_location, OPT_pedantic,
7927 "ISO C does not support complex integer types");
7928 specs->type = build_complex_type (specs->type);
7932 gcc_assert (!(specs->long_p && specs->short_p));
7933 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7934 if (specs->long_long_p)
7935 specs->type = (specs->unsigned_p
7936 ? long_long_unsigned_type_node
7937 : long_long_integer_type_node);
7938 else if (specs->long_p)
7939 specs->type = (specs->unsigned_p
7940 ? long_unsigned_type_node
7941 : long_integer_type_node);
7942 else if (specs->short_p)
7943 specs->type = (specs->unsigned_p
7944 ? short_unsigned_type_node
7945 : short_integer_type_node);
7947 specs->type = (specs->unsigned_p
7948 ? unsigned_type_node
7949 : integer_type_node);
7950 if (specs->complex_p)
7952 pedwarn (input_location, OPT_pedantic,
7953 "ISO C does not support complex integer types");
7954 specs->type = build_complex_type (specs->type);
7958 gcc_assert (!specs->long_p && !specs->short_p
7959 && !specs->signed_p && !specs->unsigned_p);
7960 specs->type = (specs->complex_p
7961 ? complex_float_type_node
7965 gcc_assert (!specs->long_long_p && !specs->short_p
7966 && !specs->signed_p && !specs->unsigned_p);
7969 specs->type = (specs->complex_p
7970 ? complex_long_double_type_node
7971 : long_double_type_node);
7975 specs->type = (specs->complex_p
7976 ? complex_double_type_node
7977 : double_type_node);
7983 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7984 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
7985 if (specs->typespec_word == cts_dfloat32)
7986 specs->type = dfloat32_type_node;
7987 else if (specs->typespec_word == cts_dfloat64)
7988 specs->type = dfloat64_type_node;
7990 specs->type = dfloat128_type_node;
7993 gcc_assert (!specs->complex_p);
7994 if (!targetm.fixed_point_supported_p ())
7995 specs->type = integer_type_node;
7996 else if (specs->saturating_p)
7998 if (specs->long_long_p)
7999 specs->type = specs->unsigned_p
8000 ? sat_unsigned_long_long_fract_type_node
8001 : sat_long_long_fract_type_node;
8002 else if (specs->long_p)
8003 specs->type = specs->unsigned_p
8004 ? sat_unsigned_long_fract_type_node
8005 : sat_long_fract_type_node;
8006 else if (specs->short_p)
8007 specs->type = specs->unsigned_p
8008 ? sat_unsigned_short_fract_type_node
8009 : sat_short_fract_type_node;
8011 specs->type = specs->unsigned_p
8012 ? sat_unsigned_fract_type_node
8013 : sat_fract_type_node;
8017 if (specs->long_long_p)
8018 specs->type = specs->unsigned_p
8019 ? unsigned_long_long_fract_type_node
8020 : long_long_fract_type_node;
8021 else if (specs->long_p)
8022 specs->type = specs->unsigned_p
8023 ? unsigned_long_fract_type_node
8024 : long_fract_type_node;
8025 else if (specs->short_p)
8026 specs->type = specs->unsigned_p
8027 ? unsigned_short_fract_type_node
8028 : short_fract_type_node;
8030 specs->type = specs->unsigned_p
8031 ? unsigned_fract_type_node
8036 gcc_assert (!specs->complex_p);
8037 if (!targetm.fixed_point_supported_p ())
8038 specs->type = integer_type_node;
8039 else if (specs->saturating_p)
8041 if (specs->long_long_p)
8042 specs->type = specs->unsigned_p
8043 ? sat_unsigned_long_long_accum_type_node
8044 : sat_long_long_accum_type_node;
8045 else if (specs->long_p)
8046 specs->type = specs->unsigned_p
8047 ? sat_unsigned_long_accum_type_node
8048 : sat_long_accum_type_node;
8049 else if (specs->short_p)
8050 specs->type = specs->unsigned_p
8051 ? sat_unsigned_short_accum_type_node
8052 : sat_short_accum_type_node;
8054 specs->type = specs->unsigned_p
8055 ? sat_unsigned_accum_type_node
8056 : sat_accum_type_node;
8060 if (specs->long_long_p)
8061 specs->type = specs->unsigned_p
8062 ? unsigned_long_long_accum_type_node
8063 : long_long_accum_type_node;
8064 else if (specs->long_p)
8065 specs->type = specs->unsigned_p
8066 ? unsigned_long_accum_type_node
8067 : long_accum_type_node;
8068 else if (specs->short_p)
8069 specs->type = specs->unsigned_p
8070 ? unsigned_short_accum_type_node
8071 : short_accum_type_node;
8073 specs->type = specs->unsigned_p
8074 ? unsigned_accum_type_node
8085 /* A subroutine of c_write_global_declarations. Perform final processing
8086 on one file scope's declarations (or the external scope's declarations),
8090 c_write_global_declarations_1 (tree globals)
8095 /* Process the decls in the order they were written. */
8096 for (decl = globals; decl; decl = TREE_CHAIN (decl))
8098 /* Check for used but undefined static functions using the C
8099 standard's definition of "used", and set TREE_NO_WARNING so
8100 that check_global_declarations doesn't repeat the check. */
8101 if (TREE_CODE (decl) == FUNCTION_DECL
8102 && DECL_INITIAL (decl) == 0
8103 && DECL_EXTERNAL (decl)
8104 && !TREE_PUBLIC (decl)
8105 && C_DECL_USED (decl))
8107 pedwarn (input_location, 0, "%q+F used but never defined", decl);
8108 TREE_NO_WARNING (decl) = 1;
8111 wrapup_global_declaration_1 (decl);
8117 for (decl = globals; decl; decl = TREE_CHAIN (decl))
8118 reconsider |= wrapup_global_declaration_2 (decl);
8122 for (decl = globals; decl; decl = TREE_CHAIN (decl))
8123 check_global_declaration_1 (decl);
8126 /* A subroutine of c_write_global_declarations Emit debug information for each
8127 of the declarations in GLOBALS. */
8130 c_write_global_declarations_2 (tree globals)
8134 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
8135 debug_hooks->global_decl (decl);
8138 /* Preserve the external declarations scope across a garbage collect. */
8139 static GTY(()) tree ext_block;
8142 c_write_global_declarations (void)
8146 /* We don't want to do this if generating a PCH. */
8150 /* Don't waste time on further processing if -fsyntax-only or we've
8151 encountered errors. */
8152 if (flag_syntax_only || errorcount || sorrycount)
8155 /* Close the external scope. */
8156 ext_block = pop_scope ();
8158 gcc_assert (!current_scope);
8162 tree tmp = BLOCK_VARS (ext_block);
8164 FILE * stream = dump_begin (TDI_tu, &flags);
8167 dump_node (tmp, flags & ~TDF_SLIM, stream);
8168 dump_end (TDI_tu, stream);
8172 /* Process all file scopes in this compilation, and the external_scope,
8173 through wrapup_global_declarations and check_global_declarations. */
8174 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8175 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
8176 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
8178 /* We're done parsing; proceed to optimize and emit assembly.
8179 FIXME: shouldn't be the front end's responsibility to call this. */
8182 /* After cgraph has had a chance to emit everything that's going to
8183 be emitted, output debug information for globals. */
8184 if (errorcount == 0 && sorrycount == 0)
8186 timevar_push (TV_SYMOUT);
8187 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8188 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
8189 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
8190 timevar_pop (TV_SYMOUT);
8196 #include "gt-c-decl.h"