[Vala] Understanding compiler... where to start?

[Jiří Zárevúcky <zarevucky jiri gmail com>]

Hello everyone.

It's been some time since I started learning Vala. Now that I
understand the language (or at least I think so), I'd like to start
digging into the compilation process, and the compiler itself, so I
can help develop it and fix issues.

Can someone give me any pointers on where to start? There is quite a
lot of code and quite a little documentation on it.