https://en.wikipedia.org/wiki/Call_graph#Free_software_call_graph_generators https://en.wikipedia.org/wiki/Call_graph#Free_software_call_... Lots of software t

https://en.wikipedia.org/wiki/Call_graph#Free_software_call_graph_generators https://en.wikipedia.org/wiki/Call_graph#Free_software_call_... Lots of software tools for generating call graphs. I've used doxygen (free) for it in the past and LDRA (not free) at an early job. This won't generate the new code for you, but will be a lot easier than manually constructing a call graph.