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|
package PAR::Filter::Bytecode;
use strict;
use base 'PAR::Filter';
use File::Temp ();
=head1 NAME
PAR::Filter::Bytecode - Bytecode filter
=head1 SYNOPSIS
PAR::Filter::Bytecode->apply(\$code); # transforms $code
=head1 DESCRIPTION
This filter uses L<B::Bytecode> to turn the script into comment-free,
architecture-specific Perl bytecode, and uses L<ByteLoader> to load
back on execution.
For L<pp> users, please add an extra B<-M> option, like this:
pp -f Bytecode -M ByteLoader
Otherwise, the implicit dependency on ByteLoader will not be detected.
=head1 CAVEATS
This backend exhibits all bugs listed in L<B::Bytecode>, and then some.
Bytecode support is considered to be extremely fragile on Perl versions
earlier than 5.8.1, and is still far from robust (as of this writing).
=cut
sub apply {
my $ref = $_[1];
my ($fh, $in_file) = File::Temp::tempfile();
print $fh $$ref;
close $fh;
my $out_file = File::Temp::tmpnam();
system($^X, "-MO=Bytecode,-H,-k,-o$out_file", $in_file);
unless (-e $out_file) {
warn "Cannot transform $in_file to $out_file: $! ($?)\n";
return;
}
unlink($in_file);
open my $fh, '<', $out_file or die $!;
local $/;
$$ref = <$fh>;
close $fh;
unlink($out_file);
}
1;
=head1 SEE ALSO
L<PAR::Filter>, L<B::Bytecode>, L<ByteLoader>
=head1 AUTHORS
Audrey Tang E<lt>cpan@audreyt.orgE<gt>
L<http://par.perl.org/> is the official PAR website. You can write
to the mailing list at E<lt>par@perl.orgE<gt>, or send an empty mail to
E<lt>par-subscribe@perl.orgE<gt> to participate in the discussion.
Please submit bug reports to E<lt>bug-par@rt.cpan.orgE<gt>.
=head1 COPYRIGHT
Copyright 2003, 2004, 2005, 2006 by Audrey Tang E<lt>cpan@audreyt.orgE<gt>.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
See L<http://www.perl.com/perl/misc/Artistic.html>
=cut
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