[14547] | 1 | /* The implementation of class Object for Objective-C. |
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| 2 | Copyright (C) 1993, 1994, 1995, 1997 Free Software Foundation, Inc. |
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| 3 | |
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| 4 | This file is part of GNU CC. |
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| 5 | |
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| 6 | GNU CC is free software; you can redistribute it and/or modify it |
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| 7 | under the terms of the GNU General Public License as published by the |
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| 8 | Free Software Foundation; either version 2, or (at your option) any |
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| 9 | later version. |
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| 10 | |
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| 11 | GNU CC is distributed in the hope that it will be useful, but WITHOUT |
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| 12 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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| 13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
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| 14 | License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU General Public License |
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| 17 | along with GNU CC; see the file COPYING. If not, write to |
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| 18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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| 19 | Boston, MA 02111-1307, USA. */ |
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| 20 | |
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| 21 | /* As a special exception, if you link this library with files compiled |
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| 22 | with GCC to produce an executable, this does not cause the resulting |
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| 23 | executable to be covered by the GNU General Public License. This |
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| 24 | exception does not however invalidate any other reasons why the |
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| 25 | executable file might be covered by the GNU General Public License. */ |
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| 26 | |
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| 27 | #include <stdarg.h> |
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| 28 | #include "objc/Object.h" |
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| 29 | #include "objc/Protocol.h" |
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| 30 | #include "objc/objc-api.h" |
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| 31 | |
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| 32 | extern int errno; |
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| 33 | |
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| 34 | #define MAX_CLASS_NAME_LEN 256 |
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| 35 | |
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| 36 | @implementation Object |
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| 37 | |
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| 38 | + initialize |
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| 39 | { |
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| 40 | return self; |
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| 41 | } |
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| 42 | |
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| 43 | - init |
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| 44 | { |
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| 45 | return self; |
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| 46 | } |
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| 47 | |
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| 48 | + new |
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| 49 | { |
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| 50 | return [[self alloc] init]; |
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| 51 | } |
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| 52 | |
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| 53 | + alloc |
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| 54 | { |
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| 55 | return class_create_instance(self); |
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| 56 | } |
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| 57 | |
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| 58 | - free |
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| 59 | { |
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| 60 | return object_dispose(self); |
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| 61 | } |
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| 62 | |
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| 63 | - copy |
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| 64 | { |
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| 65 | return [[self shallowCopy] deepen]; |
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| 66 | } |
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| 67 | |
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| 68 | - shallowCopy |
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| 69 | { |
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| 70 | return object_copy(self); |
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| 71 | } |
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| 72 | |
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| 73 | - deepen |
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| 74 | { |
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| 75 | return self; |
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| 76 | } |
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| 77 | |
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| 78 | - deepCopy |
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| 79 | { |
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| 80 | return [self copy]; |
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| 81 | } |
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| 82 | |
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| 83 | - (Class)class |
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| 84 | { |
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| 85 | return object_get_class(self); |
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| 86 | } |
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| 87 | |
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| 88 | - (Class)superClass |
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| 89 | { |
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| 90 | return object_get_super_class(self); |
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| 91 | } |
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| 92 | |
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| 93 | - (MetaClass)metaClass |
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| 94 | { |
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| 95 | return object_get_meta_class(self); |
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| 96 | } |
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| 97 | |
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| 98 | - (const char *)name |
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| 99 | { |
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| 100 | return object_get_class_name(self); |
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| 101 | } |
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| 102 | |
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| 103 | - self |
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| 104 | { |
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| 105 | return self; |
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| 106 | } |
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| 107 | |
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| 108 | - (unsigned int)hash |
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| 109 | { |
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| 110 | return (size_t)self; |
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| 111 | } |
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| 112 | |
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| 113 | - (BOOL)isEqual:anObject |
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| 114 | { |
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| 115 | return self==anObject; |
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| 116 | } |
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| 117 | |
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| 118 | - (int)compare:anotherObject; |
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| 119 | { |
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| 120 | if ([self isEqual:anotherObject]) |
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| 121 | return 0; |
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| 122 | // Ordering objects by their address is pretty useless, |
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| 123 | // so subclasses should override this is some useful way. |
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| 124 | else if (self > anotherObject) |
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| 125 | return 1; |
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| 126 | else |
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| 127 | return -1; |
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| 128 | } |
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| 129 | |
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| 130 | - (BOOL)isMetaClass |
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| 131 | { |
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| 132 | return NO; |
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| 133 | } |
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| 134 | |
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| 135 | - (BOOL)isClass |
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| 136 | { |
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| 137 | return object_is_class(self); |
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| 138 | } |
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| 139 | |
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| 140 | - (BOOL)isInstance |
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| 141 | { |
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| 142 | return object_is_instance(self); |
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| 143 | } |
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| 144 | |
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| 145 | - (BOOL)isKindOf:(Class)aClassObject |
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| 146 | { |
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| 147 | Class class; |
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| 148 | |
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| 149 | for (class = self->isa; class!=Nil; class = class_get_super_class(class)) |
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| 150 | if (class==aClassObject) |
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| 151 | return YES; |
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| 152 | return NO; |
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| 153 | } |
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| 154 | |
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| 155 | - (BOOL)isMemberOf:(Class)aClassObject |
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| 156 | { |
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| 157 | return self->isa==aClassObject; |
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| 158 | } |
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| 159 | |
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| 160 | - (BOOL)isKindOfClassNamed:(const char *)aClassName |
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| 161 | { |
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| 162 | Class class; |
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| 163 | |
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| 164 | if (aClassName!=NULL) |
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| 165 | for (class = self->isa; class!=Nil; class = class_get_super_class(class)) |
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| 166 | if (!strcmp(class_get_class_name(class), aClassName)) |
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| 167 | return YES; |
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| 168 | return NO; |
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| 169 | } |
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| 170 | |
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| 171 | - (BOOL)isMemberOfClassNamed:(const char *)aClassName |
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| 172 | { |
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| 173 | return ((aClassName!=NULL) |
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| 174 | &&!strcmp(class_get_class_name(self->isa), aClassName)); |
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| 175 | } |
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| 176 | |
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| 177 | + (BOOL)instancesRespondTo:(SEL)aSel |
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| 178 | { |
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| 179 | return class_get_instance_method(self, aSel)!=METHOD_NULL; |
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| 180 | } |
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| 181 | |
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| 182 | - (BOOL)respondsTo:(SEL)aSel |
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| 183 | { |
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| 184 | return ((object_is_instance(self) |
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| 185 | ?class_get_instance_method(self->isa, aSel) |
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| 186 | :class_get_class_method(self->isa, aSel))!=METHOD_NULL); |
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| 187 | } |
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| 188 | |
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| 189 | + (IMP)instanceMethodFor:(SEL)aSel |
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| 190 | { |
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| 191 | return method_get_imp(class_get_instance_method(self, aSel)); |
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| 192 | } |
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| 193 | |
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| 194 | // Indicates if the receiving class or instance conforms to the given protocol |
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| 195 | // not usually overridden by subclasses |
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| 196 | // |
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| 197 | // Modified 9/5/94 to always search the class object's protocol list, rather |
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| 198 | // than the meta class. |
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| 199 | |
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| 200 | + (BOOL) conformsTo: (Protocol*)aProtocol |
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| 201 | { |
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| 202 | int i; |
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| 203 | struct objc_protocol_list* proto_list; |
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| 204 | id parent; |
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| 205 | |
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| 206 | for (proto_list = ((Class)self)->protocols; |
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| 207 | proto_list; proto_list = proto_list->next) |
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| 208 | { |
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| 209 | for (i=0; i < proto_list->count; i++) |
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| 210 | { |
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| 211 | if ([proto_list->list[i] conformsTo: aProtocol]) |
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| 212 | return YES; |
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| 213 | } |
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| 214 | } |
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| 215 | |
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| 216 | if ((parent = [self superClass])) |
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| 217 | return [parent conformsTo: aProtocol]; |
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| 218 | else |
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| 219 | return NO; |
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| 220 | } |
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| 221 | |
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| 222 | - (BOOL) conformsTo: (Protocol*)aProtocol |
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| 223 | { |
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| 224 | return [[self class] conformsTo:aProtocol]; |
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| 225 | } |
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| 226 | |
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| 227 | - (IMP)methodFor:(SEL)aSel |
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| 228 | { |
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| 229 | return (method_get_imp(object_is_instance(self) |
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| 230 | ?class_get_instance_method(self->isa, aSel) |
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| 231 | :class_get_class_method(self->isa, aSel))); |
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| 232 | } |
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| 233 | |
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| 234 | + (struct objc_method_description *)descriptionForInstanceMethod:(SEL)aSel |
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| 235 | { |
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| 236 | return ((struct objc_method_description *) |
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| 237 | class_get_instance_method(self, aSel)); |
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| 238 | } |
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| 239 | |
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| 240 | - (struct objc_method_description *)descriptionForMethod:(SEL)aSel |
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| 241 | { |
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| 242 | return ((struct objc_method_description *) |
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| 243 | (object_is_instance(self) |
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| 244 | ?class_get_instance_method(self->isa, aSel) |
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| 245 | :class_get_class_method(self->isa, aSel))); |
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| 246 | } |
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| 247 | |
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| 248 | - perform:(SEL)aSel |
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| 249 | { |
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| 250 | IMP msg = objc_msg_lookup(self, aSel); |
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| 251 | if (!msg) |
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| 252 | return [self error:"invalid selector passed to %s", sel_get_name(_cmd)]; |
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| 253 | return (*msg)(self, aSel); |
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| 254 | } |
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| 255 | |
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| 256 | - perform:(SEL)aSel with:anObject |
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| 257 | { |
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| 258 | IMP msg = objc_msg_lookup(self, aSel); |
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| 259 | if (!msg) |
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| 260 | return [self error:"invalid selector passed to %s", sel_get_name(_cmd)]; |
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| 261 | return (*msg)(self, aSel, anObject); |
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| 262 | } |
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| 263 | |
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| 264 | - perform:(SEL)aSel with:anObject1 with:anObject2 |
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| 265 | { |
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| 266 | IMP msg = objc_msg_lookup(self, aSel); |
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| 267 | if (!msg) |
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| 268 | return [self error:"invalid selector passed to %s", sel_get_name(_cmd)]; |
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| 269 | return (*msg)(self, aSel, anObject1, anObject2); |
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| 270 | } |
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| 271 | |
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| 272 | - (retval_t)forward:(SEL)aSel :(arglist_t)argFrame |
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| 273 | { |
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| 274 | return (retval_t)[self doesNotRecognize: aSel]; |
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| 275 | } |
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| 276 | |
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| 277 | - (retval_t)performv:(SEL)aSel :(arglist_t)argFrame |
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| 278 | { |
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| 279 | return objc_msg_sendv(self, aSel, argFrame); |
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| 280 | } |
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| 281 | |
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| 282 | + poseAs:(Class)aClassObject |
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| 283 | { |
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| 284 | return class_pose_as(self, aClassObject); |
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| 285 | } |
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| 286 | |
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| 287 | - (Class)transmuteClassTo:(Class)aClassObject |
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| 288 | { |
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| 289 | if (object_is_instance(self)) |
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| 290 | if (class_is_class(aClassObject)) |
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| 291 | if (class_get_instance_size(aClassObject)==class_get_instance_size(isa)) |
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| 292 | if ([self isKindOf:aClassObject]) |
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| 293 | { |
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| 294 | Class old_isa = isa; |
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| 295 | isa = aClassObject; |
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| 296 | return old_isa; |
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| 297 | } |
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| 298 | return nil; |
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| 299 | } |
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| 300 | |
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| 301 | - subclassResponsibility:(SEL)aSel |
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| 302 | { |
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| 303 | return [self error:"subclass should override %s", sel_get_name(aSel)]; |
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| 304 | } |
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| 305 | |
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| 306 | - notImplemented:(SEL)aSel |
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| 307 | { |
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| 308 | return [self error:"method %s not implemented", sel_get_name(aSel)]; |
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| 309 | } |
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| 310 | |
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| 311 | - shouldNotImplement:(SEL)aSel |
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| 312 | { |
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| 313 | return [self error:"%s should not implement %s", |
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| 314 | object_get_class_name(self), sel_get_name(aSel)]; |
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| 315 | } |
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| 316 | |
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| 317 | - doesNotRecognize:(SEL)aSel |
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| 318 | { |
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| 319 | return [self error:"%s does not recognize %s", |
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| 320 | object_get_class_name(self), sel_get_name(aSel)]; |
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| 321 | } |
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| 322 | |
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| 323 | #ifdef __alpha__ |
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| 324 | extern size_t strlen(const char*); |
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| 325 | #endif |
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| 326 | |
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| 327 | - error:(const char *)aString, ... |
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| 328 | { |
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| 329 | #define FMT "error: %s (%s)\n%s\n" |
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| 330 | char fmt[(strlen((char*)FMT)+strlen((char*)object_get_class_name(self)) |
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| 331 | +((aString!=NULL)?strlen((char*)aString):0)+8)]; |
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| 332 | va_list ap; |
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| 333 | |
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| 334 | sprintf(fmt, FMT, object_get_class_name(self), |
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| 335 | object_is_instance(self)?"instance":"class", |
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| 336 | (aString!=NULL)?aString:""); |
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| 337 | va_start(ap, aString); |
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| 338 | objc_verror(self, OBJC_ERR_UNKNOWN, fmt, ap); |
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| 339 | va_end(ap); |
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| 340 | return nil; |
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| 341 | #undef FMT |
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| 342 | } |
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| 343 | |
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| 344 | + (int)version |
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| 345 | { |
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| 346 | return class_get_version(self); |
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| 347 | } |
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| 348 | |
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| 349 | + setVersion:(int)aVersion |
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| 350 | { |
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| 351 | class_set_version(self, aVersion); |
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| 352 | return self; |
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| 353 | } |
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| 354 | |
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| 355 | + (int)streamVersion: (TypedStream*)aStream |
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| 356 | { |
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| 357 | if (aStream->mode == OBJC_READONLY) |
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| 358 | return objc_get_stream_class_version (aStream, self); |
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| 359 | else |
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| 360 | return class_get_version (self); |
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| 361 | } |
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| 362 | |
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| 363 | // These are used to write or read the instance variables |
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| 364 | // declared in this particular part of the object. Subclasses |
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| 365 | // should extend these, by calling [super read/write: aStream] |
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| 366 | // before doing their own archiving. These methods are private, in |
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| 367 | // the sense that they should only be called from subclasses. |
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| 368 | |
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| 369 | - read: (TypedStream*)aStream |
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| 370 | { |
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| 371 | // [super read: aStream]; |
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| 372 | return self; |
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| 373 | } |
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| 374 | |
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| 375 | - write: (TypedStream*)aStream |
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| 376 | { |
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| 377 | // [super write: aStream]; |
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| 378 | return self; |
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| 379 | } |
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| 380 | |
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| 381 | - awake |
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| 382 | { |
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| 383 | // [super awake]; |
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| 384 | return self; |
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| 385 | } |
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| 386 | |
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| 387 | @end |
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