B::Utils::OP - op related utility functions for perl
use B::Utils::OP qw(parent_op return_op);
sub foo {
my $pop = parent_op(0);
my $rop = return_op(0);
}
sub foo {
dothis(1);
find_things();
return;
}
has the following optree:
d <1> leavesub[1 ref] K/REFC,1 ->(end) - <@> lineseq KP ->d 1 <;> nextstate(main -371 bah.pl:8) v/2 ->2 5 <1> entersub[t2] vKS/TARG,3 ->6 - <1> ex-list K ->5 2 <0> pushmark s ->3 3 <$> 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 find_things in foo is called in the entersub in #9. If you call parent_op function with level 0, you get the nextstate op that is before the entersub, which is #6. And return_op gives you the next op that the caller is returning to, in this case, the nextstate in #a.
In runtime, returns the B::OP object whose next is the entersub of the current context up level $lv
In runtime, returns the B::OP object that the current context is returning to at level $lv
Clone the $cv but with different $root and $start
Chia-liang Kao <clkao@clkao.org>
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.
