1 /* The implementation of class Object for Objective-C.
2 Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 GNU CC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* As a special exception, if you link this library with files compiled
22 with GCC to produce an executable, this does not cause the resulting
23 executable to be covered by the GNU General Public License. This
24 exception does not however invalidate any other reasons why the
25 executable file might be covered by the GNU General Public License. */
28 #include "objc/Object.h"
29 #include "objc/Protocol.h"
30 #include "objc/objc-api.h"
32 extern void (*_objc_error)(id object, const char *format, va_list);
36 #define MAX_CLASS_NAME_LEN 256
38 @implementation Object
52 return [[self alloc] init];
57 return class_create_instance(self);
62 return object_dispose(self);
67 return [[self shallowCopy] deepen];
72 return object_copy(self);
87 return object_get_class(self);
92 return object_get_super_class(self);
95 - (MetaClass)metaClass
97 return object_get_meta_class(self);
102 return object_get_class_name(self);
115 - (BOOL)isEqual:anObject
117 return self==anObject;
120 - (int)compare:anotherObject;
122 if ([self isEqual:anotherObject])
124 // Ordering objects by their address is pretty useless,
125 // so subclasses should override this is some useful way.
126 else if (self > anotherObject)
139 return object_is_class(self);
144 return object_is_instance(self);
147 - (BOOL)isKindOf:(Class)aClassObject
151 for (class = self->isa; class!=Nil; class = class_get_super_class(class))
152 if (class==aClassObject)
157 - (BOOL)isMemberOf:(Class)aClassObject
159 return self->isa==aClassObject;
162 - (BOOL)isKindOfClassNamed:(const char *)aClassName
166 if (aClassName!=NULL)
167 for (class = self->isa; class!=Nil; class = class_get_super_class(class))
168 if (!strcmp(class_get_class_name(class), aClassName))
173 - (BOOL)isMemberOfClassNamed:(const char *)aClassName
175 return ((aClassName!=NULL)
176 &&!strcmp(class_get_class_name(self->isa), aClassName));
179 + (BOOL)instancesRespondTo:(SEL)aSel
181 return class_get_instance_method(self, aSel)!=METHOD_NULL;
184 - (BOOL)respondsTo:(SEL)aSel
186 return ((object_is_instance(self)
187 ?class_get_instance_method(self->isa, aSel)
188 :class_get_class_method(self->isa, aSel))!=METHOD_NULL);
191 + (IMP)instanceMethodFor:(SEL)aSel
193 return method_get_imp(class_get_instance_method(self, aSel));
196 // Indicates if the receiving class or instance conforms to the given protocol
197 // not usually overridden by subclasses
199 // Modified 9/5/94 to always search the class object's protocol list, rather
200 // than the meta class.
202 + (BOOL) conformsTo: (Protocol*)aProtocol
205 struct objc_protocol_list* proto_list;
208 for (proto_list = ((Class)self)->protocols;
209 proto_list; proto_list = proto_list->next)
211 for (i=0; i < proto_list->count; i++)
213 if ([proto_list->list[i] conformsTo: aProtocol])
218 if (parent = [self superClass])
219 return [parent conformsTo: aProtocol];
224 - (BOOL) conformsTo: (Protocol*)aProtocol
226 return [[self class] conformsTo:aProtocol];
229 - (IMP)methodFor:(SEL)aSel
231 return (method_get_imp(object_is_instance(self)
232 ?class_get_instance_method(self->isa, aSel)
233 :class_get_class_method(self->isa, aSel)));
236 + (struct objc_method_description *)descriptionForInstanceMethod:(SEL)aSel
238 return ((struct objc_method_description *)
239 class_get_instance_method(self, aSel));
242 - (struct objc_method_description *)descriptionForMethod:(SEL)aSel
244 return ((struct objc_method_description *)
245 (object_is_instance(self)
246 ?class_get_instance_method(self->isa, aSel)
247 :class_get_class_method(self->isa, aSel)));
252 IMP msg = objc_msg_lookup(self, aSel);
254 return [self error:"invalid selector passed to %s", sel_get_name(_cmd)];
255 return (*msg)(self, aSel);
258 - perform:(SEL)aSel with:anObject
260 IMP msg = objc_msg_lookup(self, aSel);
262 return [self error:"invalid selector passed to %s", sel_get_name(_cmd)];
263 return (*msg)(self, aSel, anObject);
266 - perform:(SEL)aSel with:anObject1 with:anObject2
268 IMP msg = objc_msg_lookup(self, aSel);
270 return [self error:"invalid selector passed to %s", sel_get_name(_cmd)];
271 return (*msg)(self, aSel, anObject1, anObject2);
274 - (retval_t)forward:(SEL)aSel :(arglist_t)argFrame
276 return (retval_t)[self doesNotRecognize: aSel];
279 - (retval_t)performv:(SEL)aSel :(arglist_t)argFrame
281 return objc_msg_sendv(self, aSel, argFrame);
284 + poseAs:(Class)aClassObject
286 return class_pose_as(self, aClassObject);
289 - (Class)transmuteClassTo:(Class)aClassObject
291 if (object_is_instance(self))
292 if (class_is_class(aClassObject))
293 if (class_get_instance_size(aClassObject)==class_get_instance_size(isa))
294 if ([self isKindOf:aClassObject])
303 - subclassResponsibility:(SEL)aSel
305 return [self error:"subclass should override %s", sel_get_name(aSel)];
308 - notImplemented:(SEL)aSel
310 return [self error:"method %s not implemented", sel_get_name(aSel)];
313 - shouldNotImplement:(SEL)aSel
315 return [self error:"%s should not implement %s",
316 object_get_class_name(self), sel_get_name(aSel)];
319 - doesNotRecognize:(SEL)aSel
321 return [self error:"%s does not recognize %s",
322 object_get_class_name(self), sel_get_name(aSel)];
326 extern size_t strlen(const char*);
329 - error:(const char *)aString, ...
331 #define FMT "error: %s (%s)\n%s\n"
332 char fmt[(strlen((char*)FMT)+strlen((char*)object_get_class_name(self))
333 +((aString!=NULL)?strlen((char*)aString):0)+8)];
336 sprintf(fmt, FMT, object_get_class_name(self),
337 object_is_instance(self)?"instance":"class",
338 (aString!=NULL)?aString:"");
339 va_start(ap, aString);
340 (*_objc_error)(self, fmt, ap);
348 return class_get_version(self);
351 + setVersion:(int)aVersion
353 class_set_version(self, aVersion);
357 + (int)streamVersion: (TypedStream*)aStream
359 if (aStream->mode == OBJC_READONLY)
360 return objc_get_stream_class_version (aStream, self);
362 return class_get_version (self);
365 // These are used to write or read the instance variables
366 // declared in this particular part of the object. Subclasses
367 // should extend these, by calling [super read/write: aStream]
368 // before doing their own archiving. These methods are private, in
369 // the sense that they should only be called from subclasses.
371 - read: (TypedStream*)aStream
373 // [super read: aStream];
377 - write: (TypedStream*)aStream
379 // [super write: aStream];