当参数是通过结果的，会在被调用块的本地堆栈寄存器中分配-一个空间，变量地址被保存。被调用块内读写这个参数的所有逻辑直接访问堆栈寄存器。被调用块执行完成后，堆栈寄存器内的数值重新拷贝到实际的变量地址中。在被调用块执行过程中，实际变量值没有发生变化，但是被调用块执行完成后，实际变量值被更新。
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