objects.c
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上传日期:2013-05-12
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文件大小:3k
- /* GNU Objective C Runtime class related functions
- Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
- Contributed by Kresten Krab Thorup
- This file is part of GNU CC.
- GNU CC is free software; you can redistribute it and/or modify it under the
- terms of the GNU General Public License as published by the Free Software
- Foundation; either version 2, or (at your option) any later version.
- GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
- details.
- You should have received a copy of the GNU General Public License along with
- GNU CC; see the file COPYING. If not, write to the Free Software
- Foundation, 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
- /* As a special exception, if you link this library with files compiled with
- GCC to produce an executable, this does not cause the resulting executable
- to be covered by the GNU General Public License. This exception does not
- however invalidate any other reasons why the executable file might be
- covered by the GNU General Public License. */
- #include "objc.h"
- #include "runtime.h" /* the kitchen sink */
- #include <string.h> // memset
- #if OBJC_WITH_GC
- # include <gc.h>
- #endif
- id __objc_object_alloc (Class);
- id __objc_object_dispose (id);
- id __objc_object_copy (id);
- externobjcvardef id (*_objc_object_alloc) (Class) = __objc_object_alloc; /* !T:SINGLE */
- externobjcvardef id (*_objc_object_dispose) (id) = __objc_object_dispose; /* !T:SINGLE */
- externobjcvardef id (*_objc_object_copy) (id) = __objc_object_copy; /* !T:SINGLE */
- id
- class_create_instance(Class class)
- {
- id new = nil;
- #if OBJC_WITH_GC
- if (CLS_ISCLASS(class))
- new = (id)GC_malloc_explicitly_typed (class->instance_size,
- class->gc_object_type);
- #else
- if (CLS_ISCLASS(class))
- new = (*_objc_object_alloc)(class);
- #endif
- if (new!=nil)
- {
- memset (new, 0, class->instance_size);
- new->class_pointer = class;
- }
- return new;
- }
- id
- object_copy(id object)
- {
- if ((object!=nil)&&CLS_ISCLASS(object->class_pointer))
- return (*_objc_object_copy)(object);
- else
- return nil;
- }
- id
- object_dispose(id object)
- {
- if ((object!=nil)&&CLS_ISCLASS(object->class_pointer))
- {
- if (_objc_object_dispose)
- (*_objc_object_dispose)(object);
- else
- objc_free(object);
- }
- return nil;
- }
- id __objc_object_alloc(Class class)
- {
- return (id)objc_malloc(class->instance_size);
- }
- id __objc_object_dispose(id object)
- {
- objc_free(object);
- return 0;
- }
- id __objc_object_copy(id object)
- {
- id copy = class_create_instance(object->class_pointer);
- memcpy(copy, object, object->class_pointer->instance_size);
- return copy;
- }