LPG is the parser generator that AXDT uses. It has gone through several name changes, builds and project spaces. The compiler is part of the now-defunct Jikes Compiler project and was originally known as JikesPG, then Jikes Parser Generator and then got its current name of LALR Parser Generator (LPG). On the Eclipse wiki it it noted in several places as JikesPG, and the executable that is used for the Eclipse Java compiler is jikespg.exe, based on old documentation.

This could be wrong... feel free to fix.