/usr/lib/x86_64-linux-gnu/perl5/5.26/B/Utils/OP.pm is in libb-utils-perl 0.27-1build4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 | package B::Utils::OP;
require 5.006;
use Carp 'croak';
use strict;
use warnings;
use B::Utils ();
our @ISA = 'Exporter';
require Exporter;
our $VERSION = '0.27';
our @EXPORT = qw(parent_op return_op);
push @ISA, 'DynaLoader';
# the boot symbol is in B::Utils. bootstrap doesn't like it, so we
# need to load it manually.
my $bootname = 'boot_B__Utils__OP';
if (my $boot_symbol_ref = DynaLoader::dl_find_symbol_anywhere($bootname)) {
DynaLoader::dl_install_xsub(__PACKAGE__."::bootstrap", $boot_symbol_ref, __FILE__)->(__PACKAGE__, $VERSION);
}
=head1 NAME
B::Utils::OP - op related utility functions for perl
=head1 VERSION
version 0.27
=head1 SYNOPSIS
use B::Utils::OP qw(parent_op return_op);
sub foo {
my $pop = parent_op(0);
my $rop = return_op(0);
}
=head1 DESCRIPTION
sub foo {
dothis(1);
find_things();
return;
}
has the following optree:
d <1> leavesub[1 ref] K/REFC,1 ->(end)
- <@> lineseq KP ->d
1 <;> nextstate(main -371 bah.pl:8) v/2 ->2
5 <1> entersub[t2] vKS/TARG,3 ->6
- <1> ex-list K ->5
2 <0> pushmark s ->3
3 <$> const[IV 1] sM ->4
- <1> ex-rv2cv sK/3 ->-
4 <#> gv[*dothis] s ->5
6 <;> nextstate(main -371 bah.pl:9) v/2 ->7
9 <1> entersub[t4] vKS/TARG,3 ->a
- <1> ex-list K ->9
7 <0> pushmark s ->8
- <1> ex-rv2cv sK/3 ->-
8 <#> gv[*find_things] s/EARLYCV ->9
a <;> nextstate(main -371 bah.pl:10) v/2 ->b
c <@> return K ->d
b <0> pushmark s ->c
The C<find_things> in C<foo> is called in the C<entersub> in #9. If
you call C<parent_op> function with level 0, you get the C<nextstate>
op that is before the entersub, which is #6. And C<return_op> gives
you the next op that the caller is returning to, in this case, the
C<nextstate> in #a.
=head2 EXPORTED PERL FUNCTIONS
=over
=item parent_op($lv)
In runtime, returns the L<B::OP> object whose next is the C<entersub> of the current context up level C<$lv>
=item return_op($lv)
In runtime, returns the L<B::OP> object that the current context is returning to at level C<$lv>
=back
=head2 B::CV METHODS
=over
=item $cv->NEW_with_start($root, $start)
Clone the C<$cv> but with different C<$root> and C<$start>
=back
=head1 AUTHORS
Chia-liang Kao E<lt>clkao@clkao.orgE<gt>
=head1 COPYRIGHT
Copyright 2008 by Chia-liang Kao
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
1;
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