ISA与Class的继承#

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(lldb) p/x obj1
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(RYObject *) $8 = 0x000000028026c340
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(lldb) x/4gx 0x000000028026c340
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0x28026c340: 0x000001a1042194f1 0x0000000000000000
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0x28026c350: 0x0000b6106e0ac350 0x000000028356012e
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(lldb) p/x 0x000001a1042194f1 & 0x0000000ffffffff8ULL
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(unsigned long long) $14 = 0x00000001042194f0
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(lldb) po 0x000001a1042194f1 & 0x0000000ffffffff8ULL
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RYObject

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    RYObject *rySubObject = [[RYSubObject alloc] init];
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    NSLog(@"实例%@ 的地址是 %p", rySubObject, rySubObject);
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    Class rySubObjectClass = object_getClass(rySubObject);
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    NSLog(@"实例%@ 的类对象是 %@ 地址是 %p", rySubObject, rySubObjectClass, rySubObjectClass);
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    Class rySubObjectMetaClass = object_getClass(rySubObjectClass);
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    NSLog(@"实例%@ 的元类是 %@ 地址是 %p", rySubObject, rySubObjectMetaClass, rySubObjectMetaClass);
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    Class rySubObjectRootMetaClass = object_getClass(rySubObjectMetaClass);
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    NSLog(@"实例%@ 的根元类是 %@ 地址是 %p", rySubObject, rySubObjectRootMetaClass, rySubObjectRootMetaClass);
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    NSLog(@"\n");
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    RYObject *ryObject = [[RYObject alloc] init];
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    NSLog(@"实例%@ 的地址是 %p", ryObject, ryObject);
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    Class ryObjectClass = object_getClass(ryObject);
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    NSLog(@"实例%@ 的类对象是 %@ 地址是 %p", ryObject, ryObjectClass, ryObjectClass);
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    Class ryObjectMetaClass = object_getClass(ryObjectClass);
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    NSLog(@"实例%@ 的元类是 %@ 地址是 %p", ryObject, ryObjectMetaClass, ryObjectMetaClass);
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    Class ryObjectRootMetaClass = object_getClass(ryObjectMetaClass);
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    NSLog(@"实例%@ 的根元类是 %@ 地址是 %p", ryObject, ryObjectRootMetaClass, ryObjectRootMetaClass);
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    NSLog(@"\n");
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    NSObject *nsObject = [[NSObject alloc] init];
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    NSLog(@"实例%@ 的地址是 %p", nsObject, nsObject);
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    Class nsObjectClass = object_getClass(nsObject);
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    NSLog(@"实例%@ 的类对象是 %@ 地址是 %p", nsObject, nsObjectClass, nsObjectClass);
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    Class nsObjectMetaClass = object_getClass(nsObjectClass);
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    NSLog(@"实例%@ 的元类是 %@ 地址是 %p", nsObject, nsObjectMetaClass, nsObjectMetaClass);
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    Class nsObjectRootMetaClass = object_getClass(nsObjectMetaClass);
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    NSLog(@"实例%@ 的根元类是 %@ 地址是 %p", nsObject, nsObjectRootMetaClass, nsObjectRootMetaClass);
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    NSLog(@"\n");
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    Class rySubSuperClass = class_getSuperclass(rySubObjectClass);
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    NSLog(@"子类%@（地址%p）的父类是%@ 地址是%p",rySubObjectClass,rySubObjectClass, rySubSuperClass, rySubSuperClass);
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    Class rySuperClass = class_getSuperclass(ryObjectClass);
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    NSLog(@"父类%@（地址%p）的父类是%@ 地址是%p",ryObjectClass,ryObjectClass, rySuperClass, rySuperClass);
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    Class nsSuperClass = class_getSuperclass(nsObjectClass);
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    NSLog(@"根类%@（地址%p）的父类是%@ 地址是%p",nsObjectClass,nsObjectClass, nsSuperClass, nsSuperClass);
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    NSLog(@"\n");
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    Class rySubMetaSuperClass = class_getSuperclass(rySubObjectMetaClass);
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    NSLog(@"元类%@（地址%p）的父类是%@ 地址是%p",rySubObjectMetaClass,rySubObjectMetaClass, rySubMetaSuperClass, rySubMetaSuperClass);
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    Class ryMetaSuperClass = class_getSuperclass(ryObjectMetaClass);
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    NSLog(@"元类%@（地址%p）的父类是%@ 地址是%p",ryObjectMetaClass,ryObjectMetaClass, ryMetaSuperClass, ryMetaSuperClass);
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    Class nsMetaSuperClass = class_getSuperclass(nsObjectMetaClass);
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    NSLog(@"根元类%@（地址%p）的父类是%@ 地址是%p",nsObjectMetaClass,nsObjectMetaClass, nsMetaSuperClass, nsMetaSuperClass);