I ran haskell-indexer [1] on the GHC 8.0.2 tarball, partly because I find myself reading GHC source from time to time while working on the indexer, and partly since it's fun.

First, here you can click around [2] and find where beloved functions are called from: http://stuff.codereview.me/#ghc/compiler/hsSyn/HsBinds.hs?corpus&signature (scroll down a bit, imports are not linked yet).

Second, the way I indexed was pretty simple. I took the output of `make`, replaced the ghc used with the ghc_kythe_wrapper, and filtered the lines which included '-c', since I noticed that those duplicate previous large compile lines. This only indexes the stage1 compilation AFAIU.

Feel free to suggest a better way to tap into the compilations to get everything properly indexed (and possibly only once).

Any comments welcome!

Robin

[1]: https://github.com/google/haskell-indexer

[2]: TLDR UI quirks:

  - Click the :: in top-left to navigate file tree

  - Ctrl-Click (on linux) to go directly to definition (otherwise click stuff from bottom pane)

  - Bottom pane often hides content, close it if stuck.