python - Adding printf to the starting of all functions in a file

Question

I have some very large C files, having lots of functions. I need to trace the execution path at run time. There is no way I can trace it through debugging as its a hypervisor code currently running over qemu and doing a lot of binary translations.

Can anyone point me to some script in Perl or Python which can add a printf at the starting of all functions and the text could be something like "I am in < function name >"?

Answer 1

Just pass -finstrument-functions to gcc when compiling. See the gcc(1) man page for details.