I made use of ANTLR4 for parsing C to write a "worksheet" (like Swift's Playgrounds) tool: https://github.com/rgoulter/c-worksheet-instrumentor https://github.c

I made use of ANTLR4 for parsing C to write a "worksheet" (like Swift's Playgrounds) tool: https://github.com/rgoulter/c-worksheet-instrumentor https://github.com/rgoulter/c-worksheet-instrumentor It's an example of what you can do with "specific to a language", although it'd suffer the same limitation of "slower after a big computation".