Did you guys consider hooking this up with llvm since it provides call graph generation for the supported languages? If so what was the conclusion? If not I might look into it, no promises though.
We haven't looked at llvm yet. None of the tools for the existing languages we've targeted so far (Python, JavaScript, Go, and Ruby) had llvm-based tools that we chose to use. It would be AWESOME to hook it up to llvm. We'll help however we can, if you are interested. I'm sqs@sourcegraph.com.