这个对象必须有一个名为run() 的方法，在调用堆栈中的当前帧特别做了如上所述的标记时，由运行时执行这个方法。

This object must have a method called run(), which is executed by the runtime once the current frame in the call stack is specially marked as described above.

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获取函数的元数据标记，该函数包含与此堆栈帧关联的代码。

Gets the metadata token for the function that contains the code associated with this stack frame.

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获取函数的元数据标记，该函数包含与此堆栈帧关联的代码。

Gets the metadata token for the function that contains the code associated with this stack frame.

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