AST:
https://jonasdevlieghere.com/understanding-the-clang-ast/
http://clang.llvm.org/docs/IntroductionToTheClangAST.html
https://www.youtube.com/watch?v=VqCkCDFLSsc

clang -Xclang -ast-dump <file.cc>

http://clang.llvm.org/docs/LibASTMatchers.html

cppast:
https://github.com/foonathan/cppast
http://foonathan.net/blog/2017/04/20/cppast.html