void InterpreterMacroAssembler::call_VM_base(Register oop_result,
                                             Register java_thread,
                                             Register last_java_sp,
                                             address  entry_point,
                                             int      number_of_arguments,
                                             bool     check_exceptions) {

  {- -------------------------------------------
  (1) コード生成:
      「MacroAssembler::call_VM_base() が生成するコードによって呼び出しを行う.

       (なお, 以下の関数が生成するコードにより, 
        呼び出しの前後で r13(bcp) や r14(locals)の待避復帰も行っている.

        InterpreterMacroAssembler::save_bcp(), 
        InterpreterMacroAssembler::restore_bcp(), 
        InterpreterMacroAssembler::restore_locals())

      (なおコメントによると, 
       restore_locals() は省略できるかもしれないが, 元が重いからどのみち差なんか出ないよ, 
       とのこと)
      ---------------------------------------- -}

      // interpreter specific
      //
      // Note: Could avoid restoring locals ptr (callee saved) - however doesn't
      //       really make a difference for these runtime calls, since they are
      //       slow anyway. Btw., bcp must be saved/restored since it may change
      //       due to GC.
      // assert(java_thread == noreg , "not expecting a precomputed java thread");
      save_bcp();
    #ifdef ASSERT
      {
        Label L;
        cmpptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
        jcc(Assembler::equal, L);
        stop("InterpreterMacroAssembler::call_VM_leaf_base:"
             " last_sp != NULL");
        bind(L);
      }
    #endif /* ASSERT */
      // super call
      MacroAssembler::call_VM_base(oop_result, noreg, last_java_sp,
                                   entry_point, number_of_arguments,
                                   check_exceptions);
      // interpreter specific
      restore_bcp();
      restore_locals();
    }