在程序被主程序或者应用程序调用的过程，称为被调用过程。
对处理程序的搜索一直持续到“调用堆栈”，它是应用程序内被调用过程的序列。
The search for a handler continues up the call stack, which is the series of procedures called within the application.
该算法通过计算表达式在指向图中的左值，得到所有可能被修改的内存位置，从而计算出所有可能在被调用过程中被修改的表达式。
Through computing the lvalue of an expression in the points-to graph, we get all the modified memory locations. Thus we can get all the expressions that may be modified in the called procedure.
在异步调用过程中，当目标组件发生系统异常时，消息会回滚到传入目的地，并被重新提交。
When a system exception occurs at the target component during an asynchronous invocation, the message is rolled back to the incoming destination and redelivered.
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