I really don't think you're going to find what you're looking for in Perl. The grammatical nature of Perl makes parsing it exceptionally difficult ("Only perl can parse Perl") and so automated programs of this nature are nightmarish to write and even then won't catch everything. Nice things like eval, symbolic references, XS linkage, the ability to tweak so deeply into the engine, and other such things hammer us.
Yes, it has also been said that 'C doesn't have a grammar, C coders write their own with #define' but C seems a lot more regular than Perl does, and there's a lot more people willing to pay big money to people who can produce tools like this for it. Java obeys a nice simple grammar, which is why you see so many of these kind of tools for it.
All this being said there does seem to be good progress with the Perl Refactoring Browser, so possibly if someone was determined enough it may be possible to stand on their shoulders and produce code metrics from that. The Browser itself may do so, I've not looked that deeply into it to be honest, this'd help it detect the 'Code smells' that Refactoring is meant to solve.
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