FM / B

/usr/lib64/perl5/B

Name	Size	Mode	Actions
Concise.pm	58702	0644	edit dl rm
Debug.pm	9571	0644	edit dl rm
Deparse.pm	144067	0644	edit dl rm
Lint.pm	21606	0644	edit dl rm
Showlex.pm	5405	0644	edit dl rm
Terse.pm	2762	0644	edit dl rm
Xref.pm	10949	0644	edit dl rm

Edit: /usr/lib64/perl5/B/Showlex.pm (5405B)

package B::Showlex;

our $VERSION = '1.02';

use strict;
use B qw(svref_2object comppadlist class);
use B::Terse ();
use B::Concise ();

#
# Invoke as
#     perl -MO=Showlex,foo bar.pl
# to see the names of lexical variables used by &foo
# or as
#     perl -MO=Showlex bar.pl
# to see the names of file scope lexicals used by bar.pl
#

# borrowed from B::Concise
our $walkHandle = \*STDOUT;

sub walk_output { # updates $walkHandle
    $walkHandle = B::Concise::walk_output(@_);
    #print "got $walkHandle";
    #print $walkHandle "using it";
    $walkHandle;
}

sub shownamearray {
    my ($name, $av) = @_;
    my @els = $av->ARRAY;
    my $count = @els;
    my $i;
    print $walkHandle "$name has $count entries\n";
    for ($i = 0; $i < $count; $i++) {
	my $sv = $els[$i];
	if (class($sv) ne "SPECIAL") {
	    printf $walkHandle "$i: %s (0x%lx) %s\n", class($sv), $$sv, $sv->PVX;
	} else {
	    printf $walkHandle "$i: %s\n", $sv->terse;
	    #printf $walkHandle "$i: %s\n", B::Concise::concise_sv($sv);
	}
    }
}

sub showvaluearray {
    my ($name, $av) = @_;
    my @els = $av->ARRAY;
    my $count = @els;
    my $i;
    print $walkHandle "$name has $count entries\n";
    for ($i = 0; $i < $count; $i++) {
	printf $walkHandle "$i: %s\n", $els[$i]->terse;
	#print $walkHandle "$i: %s\n", B::Concise::concise_sv($els[$i]);
    }
}

sub showlex {
    my ($objname, $namesav, $valsav) = @_;
    shownamearray("Pad of lexical names for $objname", $namesav);
    showvaluearray("Pad of lexical values for $objname", $valsav);
}

my ($newlex, $nosp1); # rendering state vars

sub newlex { # drop-in for showlex
    my ($objname, $names, $vals) = @_;
    my @names = $names->ARRAY;
    my @vals  = $vals->ARRAY;
    my $count = @names;
    print $walkHandle "$objname Pad has $count entries\n";
    printf $walkHandle "0: %s\n", $names[0]->terse unless $nosp1;
    for (my $i = 1; $i < $count; $i++) {
	printf $walkHandle "$i: %s = %s\n", $names[$i]->terse, $vals[$i]->terse
	    unless $nosp1 and $names[$i]->terse =~ /SPECIAL/;
    }
}

sub showlex_obj {
    my ($objname, $obj) = @_;
    $objname =~ s/^&main::/&/;
    showlex($objname, svref_2object($obj)->PADLIST->ARRAY) if !$newlex;
    newlex ($objname, svref_2object($obj)->PADLIST->ARRAY) if  $newlex;
}

sub showlex_main {
    showlex("comppadlist", comppadlist->ARRAY)	if !$newlex;
    newlex ("main", comppadlist->ARRAY)		if  $newlex;
}

sub compile {
    my @options = grep(/^-/, @_);
    my @args = grep(!/^-/, @_);
    for my $o (@options) {
	$newlex = 1 if $o eq "-newlex";
	$nosp1  = 1 if $o eq "-nosp";
    }

return \&showlex_main unless @args;
    return sub {
	my $objref;
	foreach my $objname (@args) {
	    next unless $objname;	# skip nulls w/o carping

if (ref $objname) {
		print $walkHandle "B::Showlex::compile($objname)\n";
		$objref = $objname;
	    } else {
		$objname = "main::$objname" unless $objname =~ /::/;
		print $walkHandle "$objname:\n";
		no strict 'refs';
		die "err: unknown function ($objname)\n"
		    unless *{$objname}{CODE};
		$objref = \&$objname;
	    }
	    showlex_obj($objname, $objref);
	}
    }
}

__END__

=head1 NAME

B::Showlex - Show lexical variables used in functions or files

=head1 SYNOPSIS

perl -MO=Showlex[,-OPTIONS][,SUBROUTINE] foo.pl

=head1 DESCRIPTION

When a comma-separated list of subroutine names is given as options, Showlex
prints the lexical variables used in those subroutines.  Otherwise, it prints
the file-scope lexicals in the file.

=head1 EXAMPLES

Traditional form:

$ perl -MO=Showlex -e 'my ($i,$j,$k)=(1,"foo")'
 Pad of lexical names for comppadlist has 4 entries
 0: SPECIAL #1 &PL_sv_undef
 1: PVNV (0x9db0fb0) $i
 2: PVNV (0x9db0f38) $j
 3: PVNV (0x9db0f50) $k
 Pad of lexical values for comppadlist has 5 entries
 0: SPECIAL #1 &PL_sv_undef
 1: NULL (0x9da4234)
 2: NULL (0x9db0f2c)
 3: NULL (0x9db0f44)
 4: NULL (0x9da4264)
 -e syntax OK

New-style form:

$ perl -MO=Showlex,-newlex -e 'my ($i,$j,$k)=(1,"foo")'
 main Pad has 4 entries
 0: SPECIAL #1 &PL_sv_undef
 1: PVNV (0xa0c4fb8) "$i" = NULL (0xa0b8234)
 2: PVNV (0xa0c4f40) "$j" = NULL (0xa0c4f34)
 3: PVNV (0xa0c4f58) "$k" = NULL (0xa0c4f4c)
 -e syntax OK

New form, no specials, outside O framework:

$ perl -MB::Showlex -e \
    'my ($i,$j,$k)=(1,"foo"); B::Showlex::compile(-newlex,-nosp)->()'
 main Pad has 4 entries
 1: PVNV (0x998ffb0) "$i" = IV (0x9983234) 1
 2: PVNV (0x998ff68) "$j" = PV (0x998ff5c) "foo"
 3: PVNV (0x998ff80) "$k" = NULL (0x998ff74)

Note that this example shows the values of the lexicals, whereas the other
examples did not (as they're compile-time only).

=head2 OPTIONS

The C<-newlex> option produces a more readable C<< name => value >> format,
and is shown in the second example above.

The C<-nosp> option eliminates reporting of SPECIALs, such as C<0: SPECIAL
#1 &PL_sv_undef> above.  Reporting of SPECIALs can sometimes overwhelm
your declared lexicals.

=head1 SEE ALSO

C<B::Showlex> can also be used outside of the O framework, as in the third
example.  See C<B::Concise> for a fuller explanation of reasons.

=head1 TODO

Some of the reported info, such as hex addresses, is not particularly
valuable.  Other information would be more useful for the typical
programmer, such as line-numbers, pad-slot reuses, etc..  Given this,
-newlex isnt a particularly good flag-name.

=head1 AUTHOR

Malcolm Beattie, C<mbeattie@sable.ox.ac.uk>

=cut

cmd: