http://gcc.gnu.org/

Description files, Tree mapping, Gimple

@book{aho2007compilers,
  title={Compilers: principles, techniques, \& tools},
  author={Aho, Alfred V and Lam, Monica S and Sethi, Ravi and Ullman, Jeffrey D},
  volume={1009},
  year={2007},
  publisher={Pearson/Addison Wesley}
}