1 /* GNU Objective C Runtime class related functions
2 Copyright (C) 1993-2020 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 #include "objc-private/common.h"
26 #include "objc/runtime.h"
27 #include "objc/thr.h" /* Required by objc-private/runtime.h. */
28 #include "objc-private/module-abi-8.h" /* For CLS_ISCLASS and similar. */
29 #include "objc-private/runtime.h" /* the kitchen sink */
30
31 #include <string.h> /* For memcpy() */
32
33 #if OBJC_WITH_GC
34 # include <gc/gc.h>
35 # include <gc/gc_typed.h>
36 #endif
37
38 /* FIXME: The semantics of extraBytes are not really clear. */
39 id
class_createInstance(Class class,size_t extraBytes)40 class_createInstance (Class class, size_t extraBytes)
41 {
42 id new = nil;
43
44 #if OBJC_WITH_GC
45 if (CLS_ISCLASS (class))
46 new = (id) GC_malloc_explicitly_typed (class->instance_size + extraBytes,
47 (GC_descr)class->gc_object_type);
48 #else
49 if (CLS_ISCLASS (class))
50 new = (id) objc_calloc (class->instance_size + extraBytes, 1);
51 #endif
52
53 if (new != nil)
54 {
55 /* There is no need to zero the memory, since both
56 GC_malloc_explicitly_typed and objc_calloc return zeroed
57 memory. */
58 new->class_pointer = class;
59 }
60
61 /* TODO: Invoke C++ constructors on all appropriate C++ instance
62 variables of the new object. */
63
64 return new;
65 }
66
67 /* Traditional GNU Objective-C Runtime API. */
68 id
object_copy(id object,size_t extraBytes)69 object_copy (id object, size_t extraBytes)
70 {
71 if ((object != nil) && CLS_ISCLASS (object->class_pointer))
72 {
73 /* TODO: How should it work with C++ constructors ? */
74 id copy = class_createInstance (object->class_pointer, extraBytes);
75 memcpy (copy, object, object->class_pointer->instance_size + extraBytes);
76 return copy;
77 }
78 else
79 return nil;
80 }
81
82 id
object_dispose(id object)83 object_dispose (id object)
84 {
85 if ((object != nil) && CLS_ISCLASS (object->class_pointer))
86 {
87 /* TODO: Invoke C++ destructors on all appropriate C++ instance
88 variables. But what happens with the garbage collector ?
89 Would object_dispose() be ever called in that case ? */
90
91 objc_free (object);
92 }
93 return nil;
94 }
95
96 const char *
object_getClassName(id object)97 object_getClassName (id object)
98 {
99 if (object != nil)
100 return object->class_pointer->name;
101 else
102 return "Nil";
103 }
104
105 Class
object_setClass(id object,Class class_)106 object_setClass (id object, Class class_)
107 {
108 if (object == nil)
109 return Nil;
110 else
111 {
112 Class old_class = object->class_pointer;
113
114 object->class_pointer = class_;
115 return old_class;
116 }
117 }
118