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1 /* GNU Objective C Runtime class related functions
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2 Copyright (C) 1993-2017 Free Software Foundation, Inc.
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3 Contributed by Kresten Krab Thorup
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation; either version 3, or (at your option) any later version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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14 details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 #include "objc-private/common.h"
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26 #include "objc/runtime.h"
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27 #include "objc/thr.h" /* Required by objc-private/runtime.h. */
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28 #include "objc-private/module-abi-8.h" /* For CLS_ISCLASS and similar. */
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29 #include "objc-private/runtime.h" /* the kitchen sink */
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30
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31 #include <string.h> /* For memcpy() */
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32
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33 #if OBJC_WITH_GC
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34 # include <gc/gc.h>
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35 # include <gc/gc_typed.h>
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36 #endif
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37
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38 /* FIXME: The semantics of extraBytes are not really clear. */
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39 inline
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40 id
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41 class_createInstance (Class class, size_t extraBytes)
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42 {
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43 id new = nil;
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44
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45 #if OBJC_WITH_GC
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46 if (CLS_ISCLASS (class))
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47 new = (id) GC_malloc_explicitly_typed (class->instance_size + extraBytes,
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48 (GC_descr)class->gc_object_type);
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49 #else
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50 if (CLS_ISCLASS (class))
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51 new = (id) objc_calloc (class->instance_size + extraBytes, 1);
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52 #endif
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53
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54 if (new != nil)
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55 {
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56 /* There is no need to zero the memory, since both
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57 GC_malloc_explicitly_typed and objc_calloc return zeroed
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58 memory. */
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59 new->class_pointer = class;
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60 }
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61
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62 /* TODO: Invoke C++ constructors on all appropriate C++ instance
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63 variables of the new object. */
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64
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65 return new;
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66 }
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67
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68 /* Traditional GNU Objective-C Runtime API. */
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69 id
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70 object_copy (id object, size_t extraBytes)
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71 {
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72 if ((object != nil) && CLS_ISCLASS (object->class_pointer))
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73 {
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74 /* TODO: How should it work with C++ constructors ? */
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75 id copy = class_createInstance (object->class_pointer, extraBytes);
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76 memcpy (copy, object, object->class_pointer->instance_size + extraBytes);
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77 return copy;
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78 }
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79 else
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80 return nil;
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81 }
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82
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83 id
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84 object_dispose (id object)
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85 {
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86 if ((object != nil) && CLS_ISCLASS (object->class_pointer))
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87 {
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88 /* TODO: Invoke C++ destructors on all appropriate C++ instance
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89 variables. But what happens with the garbage collector ?
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90 Would object_dispose() be ever called in that case ? */
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91
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92 objc_free (object);
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93 }
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94 return nil;
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95 }
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96
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97 const char *
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98 object_getClassName (id object)
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99 {
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100 if (object != nil)
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101 return object->class_pointer->name;
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102 else
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103 return "Nil";
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104 }
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105
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106 Class
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107 object_setClass (id object, Class class_)
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108 {
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109 if (object == nil)
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110 return Nil;
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111 else
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112 {
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113 Class old_class = object->class_pointer;
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114
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115 object->class_pointer = class_;
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116 return old_class;
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117 }
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118 }
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