With caller, you can find out about the line this sub was called. If you write a __DATA__ at the end of the script, you can use a seek(DATA, 0, 0) to jump at the beginning of the script or seek(DATA, 0, $offset) to jump to a certain line. Then just search for the surrounding { } and the logical statements.
As another solution that might also work with several files, you can find the Filename of the code which called your sub with caller, open the file and do about the same as above. The latter might be cleaner, but in the moment I can't find a better solution...
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