1 /* GNU Objective C Runtime class related functions 2 Copyright (C) 1993, 1995, 1996, 2009, 2010 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.h> 35 # include <gc_typed.h> 36 #endif 37 38 /* FIXME: The semantics of extraBytes are not really clear. */ 39 inline 40 id 41 class_createInstance (Class class, size_t extraBytes) 42 { 43 id new = nil; 44 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 53 54 if (new != nil) 55 { 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; 60 } 61 62 /* TODO: Invoke C++ constructors on all appropriate C++ instance 63 variables of the new object. */ 64 65 return new; 66 } 67 68 /* Traditional GNU Objective-C Runtime API. */ 69 id 70 object_copy (id object, size_t extraBytes) 71 { 72 if ((object != nil) && CLS_ISCLASS (object->class_pointer)) 73 { 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; 78 } 79 else 80 return nil; 81 } 82 83 id 84 object_dispose (id object) 85 { 86 if ((object != nil) && CLS_ISCLASS (object->class_pointer)) 87 { 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 ? */ 91 92 objc_free (object); 93 } 94 return nil; 95 } 96 97 const char * 98 object_getClassName (id object) 99 { 100 if (object != nil) 101 return object->class_pointer->name; 102 else 103 return "Nil"; 104 } 105 106 Class 107 object_setClass (id object, Class class_) 108 { 109 if (object == nil) 110 return Nil; 111 else 112 { 113 Class old_class = object->class_pointer; 114 115 object->class_pointer = class_; 116 return old_class; 117 } 118 } 119