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此处结构为:

typedef struct objc_class{
        unsigned long long isa;
        unsigned long long superclass;
        unsigned long long cache;
        unsigned long long vtable;
        unsigned long long data;
        unsigned long long reserved1;
        unsigned long long reserved2;
        unsigned long long reserved3;
}objc_class;

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typedef struct objc_classdata{
    long long flags;
    long long instanceStart;
    long long instanceSize;
    long long reserved;
    unsigned long long ivarlayout;
    unsigned long long name;
    unsigned long long baseMethod;
    unsigned long long baseProtocol;
    unsigned long long ivars;
    unsigned long long weakIvarLayout;
    unsigned long long baseProperties;
}

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