static SharkNativeWrapper* build(SharkBuilder* builder,
                                   methodHandle  target,
                                   const char*   name,
                                   BasicType*    arg_types,
                                   BasicType     return_type) {

  {- -------------------------------------------
  (1) 新しい SharkNativeWrapper オブジェクトを作ってリターンする.
      ---------------------------------------- -}

        return new SharkNativeWrapper(builder,
                                      target,
                                      name,
                                      arg_types,
                                      return_type);
      }