首先我将创建一个样本样式表，对其应用跟踪程序。

I'll start by creating a sample stylesheet to apply the tracer to.

youdao

通过在出口点应用跟踪钩子并指定函数原型，可以探测函数的退出/返回值。

Tracing of exit/return value of a function is possible by applying trace hook at exit point and specifying function prototype.

youdao

应用程序负责跟踪它自己的状态。

The application is responsible for tracking its own state.

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