B::Xref is recommended in some of the nodes that planetscape listed.
B::Xref generates a cross reference listing of all definitions and uses of variables, subroutines and formats in a Perl program.
Here is loosely tested code that uses B::Xref to detect unreferenced subroutines:
use strict;
use warnings;
my $script_name = shift or die;
my @lines = `perl -MO=Xref,-r $script_name` or die;
my %used_subs;
my %defined_subs;
foreach (@lines) {
my ($file, $subr, $line, $package, $type, $object, $event) = split;
next if $file ne $script_name
or $type ne '&'
or $package ne 'main';
if ( $event eq 'subdef' ) {
$defined_subs{$object} = 1;
}
elsif ( $event eq 'subused' ) {
$used_subs{$object} = 1;
}
}
foreach my $key ( sort keys %defined_subs ) {
next if $used_subs{$key};
print "Sub not directly called: '$key'\n";
}
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