You can retrieve the code from named subs or coderefs with B::Deparse:

use B::Deparse;
my $d = B::Deparse->new;
# anonymous sub
my $coderef = sub { print "howdy!" }; # assuming herveus ;)
my $code = $d->coderef2text($coderef);
# named sub, e.g. coderef2text from B::Deparse
$code = $d->coderef2text(\&B::Deparse::coderef2text);
[download]

--shmem

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}