dwgrep is a tool for querying Dwarf (debuginfo) graphs. Queries are written in a language called Zwerg, the syntax of which is described in doc/syntax.rst. The engine itself is available as a shared library which can be used from C. Full documentation is available in the doc/ sub-directory. In particular, check out <doc/index.rst>. An HTML rendition of the full documentation is published at <http://pmachata.github.io/dwgrep/>.