This is interesting and clever - thank you for sharing it. However, it seems like the hash table would work on either the address or the shape of the code, and

This is interesting and clever - thank you for sharing it. However, it seems like the hash table would work on either the address or the shape of the code, and in either case you could build a pathological case which would break it. It's probably a really nice solution for the common/realistic case though.