libobjc/objects.c

   1 /* GNU Objective C Runtime class related functions
   2    Copyright (C) 1993, 1995, 1996, 2009 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 3, 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 Under Section 7 of GPL version 3, you are granted additional
  17 permissions described in the GCC Runtime Library Exception, version
  18 3.1, as published by the Free Software Foundation.
  19
  20 You should have received a copy of the GNU General Public License and
  21 a copy of the GCC Runtime Library Exception along with this program;
  22 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 <http://www.gnu.org/licenses/>.  */
  24
  25
  26 #include "tconfig.h"         /* include defs of bzero for target */
  27 #include "objc/objc.h"
  28 #include "objc/runtime.h"               /* the kitchen sink */
  29
  30 #if OBJC_WITH_GC
  31 # include <gc.h>
  32 #endif
  33
  34 id __objc_object_alloc (Class);
  35 id __objc_object_dispose (id);
  36 id __objc_object_copy (id);
  37
  38 id (*_objc_object_alloc) (Class)   = __objc_object_alloc;   /* !T:SINGLE */
  39 id (*_objc_object_dispose) (id)    = __objc_object_dispose; /* !T:SINGLE */
  40 id (*_objc_object_copy) (id)       = __objc_object_copy;    /* !T:SINGLE */
  41
  42 id
  43 class_create_instance (Class class)
  44 {
  45   id new = nil;
  46
  47 #if OBJC_WITH_GC
  48   if (CLS_ISCLASS (class))
  49     new = (id) GC_malloc_explicitly_typed (class->instance_size,
  50                                            class->gc_object_type);
  51 #else
  52   if (CLS_ISCLASS (class))
  53     new = (*_objc_object_alloc) (class);
  54 #endif
  55
  56   if (new != nil)
  57     {
  58       memset (new, 0, class->instance_size);
  59       new->class_pointer = class;
  60     }
  61   return new;
  62 }
  63
  64 id
  65 object_copy (id object)
  66 {
  67   if ((object != nil) && CLS_ISCLASS (object->class_pointer))
  68     return (*_objc_object_copy) (object);
  69   else
  70     return nil;
  71 }
  72
  73 id
  74 object_dispose (id object)
  75 {
  76   if ((object != nil) && CLS_ISCLASS (object->class_pointer))
  77     {
  78       if (_objc_object_dispose)
  79         (*_objc_object_dispose) (object);
  80       else
  81         objc_free (object);
  82     }
  83   return nil;
  84 }
  85
  86 id __objc_object_alloc (Class class)
  87 {
  88   return (id) objc_malloc (class->instance_size);
  89 }
  90
  91 id __objc_object_dispose (id object)
  92 {
  93   objc_free (object);
  94   return 0;
  95 }
  96
  97 id __objc_object_copy (id object)
  98 {
  99   id copy = class_create_instance (object->class_pointer);
 100   memcpy (copy, object, object->class_pointer->instance_size);
 101   return copy;
 102 }