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I interned at a company called Palamida that did this around 2006. They were eventually acquired by Flexera. One of their competitors was Black Duck Software which was acquired by Synopsys.

There is PMD's CPD: https://pmd.github.io/latest/pmd_userdocs_cpd.html

Guys from AdaCore working on a new Ada parsing and semantic manipulation library had a small try, fun read : https://blog.adacore.com/a-usable-copy-paste-detector-in-few...