Similar Projects: CPP2XML, CPPX, GASTA
And links to AST information.

CPP2XML

CPPX : The CPPX project is very promising
CPPX

Guillaume Thouvenin's Gasta - Gcc Abstract Syntax Tree Analysis
http://gasta.sf.net
GASTA

Compiler Notes about ASTS
ASt Overview 1/2
ASt Overview 2/2