gcc/objc/objects.c

   1 /* GNU Objective C Runtime class related functions
   2    Copyright (C) 1993 Free Software Foundation, Inc.
   3
   4 Author: Kresten Krab Thorup
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify it under the
   9    terms of the GNU General Public License as published by the Free Software
  10    Foundation; either version 2, or (at your option) any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
  13    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  14    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  15    details.
  16
  17 You should have received a copy of the GNU General Public License along with
  18    GNU CC; see the file COPYING.  If not, write to the Free Software
  19    Foundation, 675 Mass Ave, Cambridge, MA 02139, 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 "runtime.h"            /* the kitchen sink */
  29
  30 id __objc_object_alloc(Class*);
  31 id __objc_object_dispose(id);
  32 id __objc_object_copy(id);
  33
  34 id (*_objc_object_alloc)(Class*) = __objc_object_alloc;
  35 id (*_objc_object_dispose)(id)    = __objc_object_dispose;
  36 id (*_objc_object_copy)(id)       = __objc_object_copy;
  37
  38 id
  39 class_create_instance(Class* class)
  40 {
  41   id new = nil;
  42   if (CLS_ISCLASS(class))
  43     new = (*_objc_object_alloc)(class);
  44   if (new!=nil)
  45     {
  46       bzero (new, class->instance_size);
  47       new->class_pointer = class;
  48     }
  49   return new;
  50 }
  51
  52 id
  53 object_copy(id object)
  54 {
  55   if ((object!=nil)&&CLS_ISCLASS(object->class_pointer))
  56     return (*_objc_object_copy)(object);
  57   else
  58     return nil;
  59 }
  60
  61 id
  62 object_dispose(id object)
  63 {
  64   if ((object!=nil)&&CLS_ISCLASS(object->class_pointer))
  65     {
  66       if (_objc_object_dispose)
  67         (*_objc_object_dispose)(object);
  68       else
  69         free(object);
  70     }
  71   return nil;
  72 }
  73
  74 id __objc_object_alloc(Class* class)
  75 {
  76   return (id)__objc_xmalloc(class->instance_size);
  77 }
  78
  79 id __objc_object_dispose(id object)
  80 {
  81   free(object);
  82   return 0;
  83 }
  84
  85 id __objc_object_copy(id object)
  86 {
  87   id copy = class_create_instance(object->class_pointer);
  88   memcpy(copy, object, object->class_pointer->instance_size);
  89   return copy;
  90 }
  91
  92