libobjc/objects.c

   1 /* GNU Objective C Runtime class related functions
   2    Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
   3    Contributed by Kresten Krab Thorup
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under the
   8 terms of the GNU General Public License as published by the Free Software
   9 Foundation; either version 2, or (at your option) any later version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13 FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  14 details.
  15
  16 You should have received a copy of the GNU General Public License along with
  17 GCC; see the file COPYING.  If not, write to the Free Software
  18 Foundation, 51 Franklin Street, Fifth Floor,
  19 Boston, MA 02110-1301, USA.  */
  20
  21 /* As a special exception, if you link this library with files compiled with
  22    GCC to produce an executable, this does not cause the resulting executable
  23    to be covered by the GNU General Public License. This exception does not
  24    however invalidate any other reasons why the executable file might be
  25    covered by the GNU General Public License.  */
  26
  27 #include "tconfig.h"         /* include defs of bzero for target */
  28 #include "objc/objc.h"
  29 #include "objc/runtime.h"               /* the kitchen sink */
  30
  31 #if OBJC_WITH_GC
  32 # include <gc.h>
  33 #endif
  34
  35 id __objc_object_alloc (Class);
  36 id __objc_object_dispose (id);
  37 id __objc_object_copy (id);
  38
  39 id (*_objc_object_alloc) (Class)   = __objc_object_alloc;   /* !T:SINGLE */
  40 id (*_objc_object_dispose) (id)    = __objc_object_dispose; /* !T:SINGLE */
  41 id (*_objc_object_copy) (id)       = __objc_object_copy;    /* !T:SINGLE */
  42
  43 id
  44 class_create_instance (Class class)
  45 {
  46   id new = nil;
  47
  48 #if OBJC_WITH_GC
  49   if (CLS_ISCLASS (class))
  50     new = (id) GC_malloc_explicitly_typed (class->instance_size,
  51                                            class->gc_object_type);
  52 #else
  53   if (CLS_ISCLASS (class))
  54     new = (*_objc_object_alloc) (class);
  55 #endif
  56
  57   if (new != nil)
  58     {
  59       memset (new, 0, class->instance_size);
  60       new->class_pointer = class;
  61     }
  62   return new;
  63 }
  64
  65 id
  66 object_copy (id object)
  67 {
  68   if ((object != nil) && CLS_ISCLASS (object->class_pointer))
  69     return (*_objc_object_copy) (object);
  70   else
  71     return nil;
  72 }
  73
  74 id
  75 object_dispose (id object)
  76 {
  77   if ((object != nil) && CLS_ISCLASS (object->class_pointer))
  78     {
  79       if (_objc_object_dispose)
  80         (*_objc_object_dispose) (object);
  81       else
  82         objc_free (object);
  83     }
  84   return nil;
  85 }
  86
  87 id __objc_object_alloc (Class class)
  88 {
  89   return (id) objc_malloc (class->instance_size);
  90 }
  91
  92 id __objc_object_dispose (id object)
  93 {
  94   objc_free (object);
  95   return 0;
  96 }
  97
  98 id __objc_object_copy (id object)
  99 {
 100   id copy = class_create_instance (object->class_pointer);
 101   memcpy (copy, object, object->class_pointer->instance_size);
 102   return copy;
 103 }