[4/7] Preprocessor location-kind predicates
[official-gcc.git] / libobjc / objects.c
blob521fa18d3e57e73258592b11d9b2ce4f523f1967
1 /* GNU Objective C Runtime class related functions
2 Copyright (C) 1993-2018 Free Software Foundation, Inc.
3 Contributed by Kresten Krab Thorup
5 This file is part of GCC.
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.
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.
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.
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/>. */
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 */
31 #include <string.h> /* For memcpy() */
33 #if OBJC_WITH_GC
34 # include <gc/gc.h>
35 # include <gc/gc_typed.h>
36 #endif
38 /* FIXME: The semantics of extraBytes are not really clear. */
39 inline
41 class_createInstance (Class class, size_t extraBytes)
43 id new = nil;
45 #if OBJC_WITH_GC
46 if (CLS_ISCLASS (class))
47 new = (id) GC_malloc_explicitly_typed (class->instance_size + extraBytes,
48 (GC_descr)class->gc_object_type);
49 #else
50 if (CLS_ISCLASS (class))
51 new = (id) objc_calloc (class->instance_size + extraBytes, 1);
52 #endif
54 if (new != nil)
56 /* There is no need to zero the memory, since both
57 GC_malloc_explicitly_typed and objc_calloc return zeroed
58 memory. */
59 new->class_pointer = class;
62 /* TODO: Invoke C++ constructors on all appropriate C++ instance
63 variables of the new object. */
65 return new;
68 /* Traditional GNU Objective-C Runtime API. */
70 object_copy (id object, size_t extraBytes)
72 if ((object != nil) && CLS_ISCLASS (object->class_pointer))
74 /* TODO: How should it work with C++ constructors ? */
75 id copy = class_createInstance (object->class_pointer, extraBytes);
76 memcpy (copy, object, object->class_pointer->instance_size + extraBytes);
77 return copy;
79 else
80 return nil;
84 object_dispose (id object)
86 if ((object != nil) && CLS_ISCLASS (object->class_pointer))
88 /* TODO: Invoke C++ destructors on all appropriate C++ instance
89 variables. But what happens with the garbage collector ?
90 Would object_dispose() be ever called in that case ? */
92 objc_free (object);
94 return nil;
97 const char *
98 object_getClassName (id object)
100 if (object != nil)
101 return object->class_pointer->name;
102 else
103 return "Nil";
106 Class
107 object_setClass (id object, Class class_)
109 if (object == nil)
110 return Nil;
111 else
113 Class old_class = object->class_pointer;
115 object->class_pointer = class_;
116 return old_class;