协议

Protocol - “协议”

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看源码

protocol_t

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// objc-runtime-new.h#L1425 
struct protocol_t : objc_object { // 协议结构体定义
    const char *mangledName;
    struct protocol_list_t *protocols;
    method_list_t *instanceMethods;
    method_list_t *classMethods;
    method_list_t *optionalInstanceMethods;
    method_list_t *optionalClassMethods;
    property_list_t *instanceProperties;
    uint32_t size;   // sizeof(protocol_t)
    uint32_t flags;
    // Fields below this point are not always present on disk.
    const char **_extendedMethodTypes;
    const char *_demangledName;
    property_list_t *_classProperties;
}

protocol_list_t

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struct protocol_list_t {
    // count is pointer-sized by accident.
    uintptr_t count;
    protocol_ref_t list[0]; // variable-size
}

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写总结