runtime/Protocol.mm

   1 /*
   2  * Copyright (c) 1999-2001, 2005-2007 Apple Inc.  All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24         Protocol.h
  25         Copyright 1991-1996 NeXT Software, Inc.
  26 */
  27
  28 #include "objc-private.h"
  29
  30 #undef id
  31 #undef Class
  32
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <mach-o/dyld.h>
  36 #include <mach-o/ldsyms.h>
  37
  38 #include "Protocol.h"
  39
  40 #if __OBJC2__
  41 @interface __IncompleteProtocol : NSObject @end
  42 @implementation __IncompleteProtocol
  43 // fixme hack - make __IncompleteProtocol a non-lazy class
  44 + (void) load { }
  45 @end
  46 #endif
  47
  48 @implementation Protocol
  49
  50 #if __OBJC2__
  51 // fixme hack - make Protocol a non-lazy class
  52 + (void) load { }
  53 #endif
  54
  55
  56 - (BOOL) conformsTo: (Protocol *)aProtocolObj
  57 {
  58     return protocol_conformsToProtocol(self, aProtocolObj);
  59 }
  60
  61 - (struct objc_method_description *) descriptionForInstanceMethod:(SEL)aSel
  62 {
  63 #if !__OBJC2__
  64     return lookup_protocol_method((struct old_protocol *)self, aSel,
  65                                   YES/*required*/, YES/*instance*/,
  66                                   YES/*recursive*/);
  67 #else
  68     return method_getDescription(protocol_getMethod((struct protocol_t *)self,
  69                                                      aSel, YES, YES, YES));
  70 #endif
  71 }
  72
  73 - (struct objc_method_description *) descriptionForClassMethod:(SEL)aSel
  74 {
  75 #if !__OBJC2__
  76     return lookup_protocol_method((struct old_protocol *)self, aSel,
  77                                   YES/*required*/, NO/*instance*/,
  78                                   YES/*recursive*/);
  79 #else
  80     return method_getDescription(protocol_getMethod((struct protocol_t *)self,
  81                                                     aSel, YES, NO, YES));
  82 #endif
  83 }
  84
  85 - (const char *)name
  86 {
  87     return protocol_getName(self);
  88 }
  89
  90 - (BOOL)isEqual:other
  91 {
  92 #if __OBJC2__
  93     // check isKindOf:
  94     Class cls;
  95     Class protoClass = objc_getClass("Protocol");
  96     for (cls = object_getClass(other); cls; cls = cls->superclass) {
  97         if (cls == protoClass) break;
  98     }
  99     if (!cls) return NO;
 100     // check equality
 101     return protocol_isEqual(self, other);
 102 #else
 103     return [other isKindOf:[Protocol class]] && [self conformsTo: other] && [other conformsTo: self];
 104 #endif
 105 }
 106
 107 #if __OBJC2__
 108 - (NSUInteger)hash
 109 {
 110     return 23;
 111 }
 112 #else
 113 - (unsigned)hash
 114 {
 115     return 23;
 116 }
 117 #endif
 118
 119 @end