+-------+ | cflow | +-------+ GNU cflow analyzes a collection of C source files and prints a graph, charting control flow within the program. GNU cflow is able to produce both direct and inverted flowgraphs for C sources. Optionally a cross-reference listing can be generated. Two output formats are implemented: POSIX and GNU (extended). Input files can optionally be preprocessed before analyzing. https://www.gnu.org/software/cflow