Treehydra development was abandoned sometime in 2010. Use at your own risk.
Try the gcc python plugin instead: https://fedorahosted.org/gcc-python-plugin/.
Most of Treehydra is generated by Dehydra. A Dehydra script walks the GCC tree node structure using the GTY attributes present in GCC. Treehydra is included in Dehydra source, and is built when a plugin-enabled CXX is detected.
For description of node types used in Treehydra see tree.def and cp-tree.def in the GCC sources.
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