I don't think this is the right way to do what you want. According to Verilog::Netlist::Net, dump_drivers is for debugging purposes. Since it doesn't give many more details about what it does, you should not rely on it to provide output in a consistent manner. It could change any any time in the future.

Looking at the source code, dump_drivers prints to STDOUT. So, to capture its output into a variable, you'd probably have to use select. But, I don't think that's worth it.

The reason you see 0 but true is because that is the return value of the last statement executed by sub dump_drivers: 

    flush STDOUT;

[download]

You should gather all the info you need for each pin as you descend through the Verilog module hierarchy.

UPDATE: Again, I don't recommend it, but to capture the STDOUT, you could do something like: 

my $fh;
my $out;
my $old_stdout;
open $fh, '>', \$out;
$old_stdout = select $fh;
my $x = $pin->net->dump_drivers();
select $old_stdout;
close $fh;
print $out; # This has the output you want

[download]

In reply to Re: Problem with storing values (Verilog::Netlist::Net) by toolic
in thread Problem with storing values by mavericknik

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