But this isn't unwinding the stack (not yet at least).

然而这并不是堆栈展开(unwinding the stack)(至少现在不是)。

youdao

Using this feature is an optimization that reduces overall code size because, by default, even if the code does not throw exceptions, cl still generates stack unwinding information for C++ sources.

使用这个特性可以对减少整体代码的大小进行优化，因为在缺省情况下，即使代码不会引发异常，cl 仍然会为 C++ 源代码生成堆栈展开信息。

youdao