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8. Know Thy Code > 78. Introspect Your Subroutines

Introspect Your Subroutines

Trace any subroutine to its source.

You can name anonymous subroutines [Hack #57] and deparse them [Hack #56]. You can even peek at their closed-over lexical variables [Hack #76]. There are still more wonders in the world.

Someday you’ll have to debug a running program and figure out exactly where package A picked up subroutine B. One option is to trace all import( ) calls, but that’s even less fun than it sounds. Another option is to pull out the scariest and most powerful toolkit in the Perl hacker’s toolbox: the B::* modules.

The Hack

Finding a misbehaving function means you need to know two of three things:

  • The original package of the function

  • The name of the file containing the function


  

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