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739 |
jeremybenn |
/* GNU Objective C Runtime class related functions
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Copyright (C) 1993, 1995, 1996, 2009, 2010 Free Software Foundation, Inc.
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Contributed by Kresten Krab Thorup
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "objc-private/common.h"
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#include "objc/runtime.h"
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#include "objc/thr.h" /* Required by objc-private/runtime.h. */
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#include "objc-private/module-abi-8.h" /* For CLS_ISCLASS and similar. */
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#include "objc-private/runtime.h" /* the kitchen sink */
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#include <string.h> /* For memcpy() */
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#if OBJC_WITH_GC
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# include <gc.h>
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# include <gc_typed.h>
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#endif
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/* FIXME: The semantics of extraBytes are not really clear. */
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inline
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id
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class_createInstance (Class class, size_t extraBytes)
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{
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id new = nil;
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#if OBJC_WITH_GC
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if (CLS_ISCLASS (class))
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new = (id) GC_malloc_explicitly_typed (class->instance_size + extraBytes,
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(GC_descr)class->gc_object_type);
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#else
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if (CLS_ISCLASS (class))
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new = (id) objc_calloc (class->instance_size + extraBytes, 1);
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#endif
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if (new != nil)
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{
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/* There is no need to zero the memory, since both
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GC_malloc_explicitly_typed and objc_calloc return zeroed
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memory. */
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new->class_pointer = class;
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}
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/* TODO: Invoke C++ constructors on all appropriate C++ instance
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variables of the new object. */
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return new;
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}
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/* Traditional GNU Objective-C Runtime API. */
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id
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object_copy (id object, size_t extraBytes)
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{
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if ((object != nil) && CLS_ISCLASS (object->class_pointer))
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{
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/* TODO: How should it work with C++ constructors ? */
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id copy = class_createInstance (object->class_pointer, extraBytes);
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memcpy (copy, object, object->class_pointer->instance_size + extraBytes);
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return copy;
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}
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else
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return nil;
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}
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id
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object_dispose (id object)
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{
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if ((object != nil) && CLS_ISCLASS (object->class_pointer))
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{
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/* TODO: Invoke C++ destructors on all appropriate C++ instance
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variables. But what happens with the garbage collector ?
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Would object_dispose() be ever called in that case ? */
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objc_free (object);
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}
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return nil;
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}
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const char *
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object_getClassName (id object)
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{
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if (object != nil)
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return object->class_pointer->name;
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else
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return "Nil";
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}
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Class
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object_setClass (id object, Class class_)
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{
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if (object == nil)
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return Nil;
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else
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{
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Class old_class = object->class_pointer;
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object->class_pointer = class_;
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return old_class;
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}
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}
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