...says look at [link|http://search.cpan.org/search?mode=module&query=Devel::TraceFuncs|Devel::TraceFuncs], [link|http://search.cpan.org/search?mode=module&query=Devel::TraceCalls|Devel::TraceCalls], and [link|http://search.cpan.org/search?mode=module&query=Debug::Trace|Debug::Trace].