Class::Inspector might also help.  For example:

#!/usr/bin/perl -l

package PkgA;

sub fooA {}
sub barA {}

package PkgB;

use base "PkgA";
sub fooB {}

package PkgC;

use base "PkgB";
sub barC {}


package main;

use Class::Inspector;

print for @{ Class::Inspector->methods('PkgC', 'full') };

__END__
PkgA::barA
PkgC::barC
PkgA::fooA
PkgB::fooB
[download]

Or, if you want to call it from within the child package (PkgC):

...
package PkgC;
...
use Class::Inspector;
print for @{ Class::Inspector->methods(__PACKAGE__, 'full') };
[download]