Okay, so I tried the following code:

#!/usr/bin/perl
use warnings;
use strict;
use Hook::LexWrap;

my @mars_subs = qw (add increment);
for (@mars_subs) {
    wrap $_, pre => sub {
        my @caller = caller(0);
        for (@caller) {
            print $_, " " if defined $_;
        }
        print "\n";
    };
}

print add( 1, 2 ), "\n";

sub add {
    my ( $num1, $num2 ) = @_;
    increment($num1);
    return $num1 + $num2;
}

sub increment {
    my $num = shift;
    return ++$num;
}
[download]

And the output I got is:

main hooklexwrap.pl 17 main::__ANON__ 1 1 1794 UUUUUUUUUUUUU
main hooklexwrap.pl 21 main::__ANON__ 1 1538 UUUUUUUUUUUUU
3
[download]

How do I get the actual sub names like main::add instead of main::__ANON__ ?

What are you trying to report? Are you trying to emit something for every executed function? In that case, close over the name of the wrapped function:

my @mars_subs = qw( add increment );

for my $sub (@mars_subs) {
    wrap $sub, pre => sub {
        print "Calling '$sub'\n";
    };
}
[download]

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Improve your skills with Modern Perl: the free book.

Thanks. Yes, I want to log how these various subroutines are called one after the other, for understanding how this set of perl scripts and modules works and the dependencies between them. It's all legacy code of thousands of lines. Is there a better way to do this?