Java, C#, Go, Python, JavaScript, Swift and C++ although everything gets started with Java and filled out to the other targets. You may be thinking of ANTRL 3.

Java, C#, Go, Python, JavaScript, Swift and C++ although everything gets started with Java and filled out to the other targets. You may be thinking of ANTRL 3. I really didn't much care for the ANTLR 3 C target but I use ANTRL 4 and its C target. It is really much much better than ANTRL 3. TParr says ANTLR 4 is the parser generator he always wanted to make. However, I'm not still pitching ANTRL as a parser for a real compiler. ANTRL rules the world for little languages, domain specific languages but a production language would almost certainly would use a hand crafted recursive decent compiler. This is a learning project. So I'd strongly recommend anyone learn modern tools and methods and learn those. bison is C++ native with experimental Java support and nothing else. flex is C and C++ only. Not a fan.