NAME

B::Utils1::OP - op related utility functions for perl

SYNOPSIS

            

              
              
use B::Utils1::OP qw(parent_op return_op);
sub foo {
  my $pop = parent_op(0);
  my $rop = return_op(0);
}
            
          

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 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.

EXPORTED PERL FUNCTIONS

parent_op($lv)

In runtime, returns the B::OP object whose next is the entersub of the current context up level $lv

return_op($lv)

In runtime, returns the B::OP object that the current context is returning to at level $lv

AUTHORS

Chia-liang Kao <clkao@clkao.org>

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 http://www.perl.com/perl/misc/Artistic.html