1B::Utils::OP(3)       User Contributed Perl Documentation      B::Utils::OP(3)
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NAME

6       B::Utils::OP - op related utility functions for perl
7

VERSION

9       version 0.27
10

SYNOPSIS

12         use B::Utils::OP qw(parent_op return_op);
13         sub foo {
14           my $pop = parent_op(0);
15           my $rop = return_op(0);
16         }
17

DESCRIPTION

19         sub foo {
20           dothis(1);
21           find_things();
22           return;
23         }
24
25       has the following optree:
26
27        d  <1> leavesub[1 ref] K/REFC,1 ->(end)
28        -     <@> lineseq KP ->d
29        1        <;> nextstate(main -371 bah.pl:8) v/2 ->2
30        5        <1> entersub[t2] vKS/TARG,3 ->6
31        -           <1> ex-list K ->5
32        2              <0> pushmark s ->3
33        3              <$> const[IV 1] sM ->4
34        -              <1> ex-rv2cv sK/3 ->-
35        4                 <#> gv[*dothis] s ->5
36        6        <;> nextstate(main -371 bah.pl:9) v/2 ->7
37
38        9        <1> entersub[t4] vKS/TARG,3 ->a
39        -           <1> ex-list K ->9
40        7              <0> pushmark s ->8
41        -              <1> ex-rv2cv sK/3 ->-
42        8                 <#> gv[*find_things] s/EARLYCV ->9
43
44        a        <;> nextstate(main -371 bah.pl:10) v/2 ->b
45        c        <@> return K ->d
46        b           <0> pushmark s ->c
47
48       The "find_things" in "foo" is called in the "entersub" in #9.  If you
49       call "parent_op" function with level 0, you get the "nextstate" op that
50       is before the entersub, which is #6.  And "return_op" gives you the
51       next op that the caller is returning to, in this case, the "nextstate"
52       in #a.
53
54   EXPORTED PERL FUNCTIONS
55       parent_op($lv)
56           In runtime, returns the B::OP object whose next is the "entersub"
57           of the current context up level $lv
58
59       return_op($lv)
60           In runtime, returns the B::OP object that the current context is
61           returning to at level $lv
62
63   B::CV METHODS
64       $cv->NEW_with_start($root, $start)
65           Clone the $cv but with different $root and $start
66

AUTHORS

68       Chia-liang Kao <clkao@clkao.org>
69

71       Copyright 2008 by Chia-liang Kao
72
73       This program is free software; you can redistribute it and/or modify it
74       under the same terms as Perl itself.
75
76       See <http://www.perl.com/perl/misc/Artistic.html>
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80perl v5.34.0                      2021-07-22                   B::Utils::OP(3)
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