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copied!<p>The following code could be part of your solution - it will show you which symbols are imported for each instance of <code>use</code>:</p> <pre><code>package traceuse; use strict; use warnings; use Devel::Symdump; sub import { my $class = shift; my $module = shift; my $caller = caller(); my $before = Devel::Symdump->new($caller); my $args = \@_; # more robust way of emulating use? eval "package $caller; require $module; $module\->import(\@\$args)"; my $after = Devel::Symdump->new($caller); my @added; my @after_subs = $after->functions; my %before_subs = map { ($_,1) } $before->functions; for my $k (@after_subs) { push(@added, $k) unless $before_subs{$k}; } if (@added) { warn "using module $module added: ".join(' ', @added)."\n"; } else { warn "no new symbols from using module $module\n"; } } 1; </code></pre> <p>Then just replace "use module ..." with "use traceuse module ...", and you'll get a list of the functions that were imported.</p> <p>Usage example:</p> <pre><code>package main; sub foo { print "debug: foo called with: ".Dumper(\@_)."\n"; } use traceuse Data::Dumper; </code></pre> <p>This will output:</p> <pre><code>using module Data::Dumper added: main::Dumper </code></pre> <p>i.e. you can tell which functions were imported in robust way. And you can easily extend this to report on imported scalar, array and hash variables - check the docs on <code>Devel::Symdump</code>.</p> <p>Determine which functions are actually used is the other half of the equation. For that you might be able to get away with a simple grep of your source code - i.e. does <code>Dumper</code> appear in the module's source code that's not on a <code>use</code> line. It depends on what you know about your source code.</p> <p>Notes:</p> <ul> <li><p>there may be a module which does what traceuse does - I haven't checked</p></li> <li><p>there might be a better way to emulate "use" from another package</p></li> </ul>

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