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
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <mach-o/dyld.h>
  32 #include <mach-o/ldsyms.h>
  33
  34 #include "Protocol.h"
  35 #include "objc-private.h"
  36 #include "objc-runtime-old.h"
  37
  38 #if __OBJC2__
  39 @interface __IncompleteProtocol : NSObject @end
  40 @implementation __IncompleteProtocol
  41 // fixme hack - make __IncompleteProtocol a non-lazy class
  42 + (void) load { }
  43 @end
  44 #endif
  45
  46 @implementation Protocol
  47
  48 #if __OBJC2__
  49 // fixme hack - make Protocol a non-lazy class
  50 + (void) load { }
  51 #endif
  52
  53
  54 typedef struct {
  55     uintptr_t count;
  56     Protocol *list[0];
  57 } protocol_list_t;
  58
  59 - (BOOL) conformsTo: (Protocol *)aProtocolObj
  60 {
  61     return protocol_conformsToProtocol(self, aProtocolObj);
  62 }
  63
  64 - (struct objc_method_description *) descriptionForInstanceMethod:(SEL)aSel
  65 {
  66 #if !__OBJC2__
  67     return lookup_protocol_method((struct old_protocol *)self, aSel,
  68                                   YES/*required*/, YES/*instance*/,
  69                                   YES/*recursive*/);
  70 #else
  71     return method_getDescription(_protocol_getMethod(self, aSel,
  72                                                      YES, YES, YES));
  73 #endif
  74 }
  75
  76 - (struct objc_method_description *) descriptionForClassMethod:(SEL)aSel
  77 {
  78 #if !__OBJC2__
  79     return lookup_protocol_method((struct old_protocol *)self, aSel,
  80                                   YES/*required*/, NO/*instance*/,
  81                                   YES/*recursive*/);
  82 #else
  83     return method_getDescription(_protocol_getMethod(self, aSel,
  84                                                      YES, NO, YES));
  85 #endif
  86 }
  87
  88 - (const char *)name
  89 {
  90     return protocol_getName(self);
  91 }
  92
  93 - (BOOL)isEqual:other
  94 {
  95 #if __OBJC2__
  96     // check isKindOf:
  97     Class cls;
  98     Class protoClass = objc_getClass("Protocol");
  99     for (cls = object_getClass(other); cls; cls = class_getSuperclass(cls)) {
 100         if (cls == protoClass) break;
 101     }
 102     if (!cls) return NO;
 103     // check equality
 104     return protocol_isEqual(self, other);
 105 #else
 106     return [other isKindOf:[Protocol class]] && [self conformsTo: other] && [other conformsTo: self];
 107 #endif
 108 }
 109
 110 #if __OBJC2__
 111 - (NSUInteger)hash
 112 {
 113     return 23;
 114 }
 115 #else
 116 - (unsigned)hash
 117 {
 118     return 23;
 119 }
 120 #endif
 121
 122 @end