Where can I find good open source code flow visualization software?

Question

I am working on an academic research regarding some very long functions in the Linux kernel (link, link).

For that research, I would like to use some code flow visualiza

Answer 1

Doxygen does some amount of 'visualization',
but you need to work on the code a bit for it to be usable.

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Another interesting thing to check would be lxr

Linux Cross Referencer is a software toolset for indexing and presenting source code repositories. LXR was initially targeted at the Linux source code, but has proved usable for a wide range of software projects. lxr.linux.no is currently running an experimental fork of the LXR software.