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| 1 |  |  |  |  |  |  | package B::Utils::OP; | 
| 2 |  |  |  |  |  |  |  | 
| 3 |  |  |  |  |  |  | require 5.006; | 
| 4 | 1 |  |  | 1 |  | 2828 | use Carp 'croak'; | 
|  | 1 |  |  |  |  | 2 |  | 
|  | 1 |  |  |  |  | 56 |  | 
| 5 | 1 |  |  | 1 |  | 3 | use strict; | 
|  | 1 |  |  |  |  | 2 |  | 
|  | 1 |  |  |  |  | 16 |  | 
| 6 | 1 |  |  | 1 |  | 3 | use warnings; | 
|  | 1 |  |  |  |  | 1 |  | 
|  | 1 |  |  |  |  | 17 |  | 
| 7 | 1 |  |  | 1 |  | 3 | use B::Utils (); | 
|  | 1 |  |  |  |  | 1 |  | 
|  | 1 |  |  |  |  | 107 |  | 
| 8 |  |  |  |  |  |  |  | 
| 9 |  |  |  |  |  |  | our @ISA = 'Exporter'; | 
| 10 |  |  |  |  |  |  | require Exporter; | 
| 11 |  |  |  |  |  |  | our $VERSION = '0.27'; | 
| 12 |  |  |  |  |  |  | our @EXPORT = qw(parent_op return_op); | 
| 13 |  |  |  |  |  |  |  | 
| 14 |  |  |  |  |  |  |  | 
| 15 |  |  |  |  |  |  | push @ISA, 'DynaLoader'; | 
| 16 |  |  |  |  |  |  | # the boot symbol is in B::Utils.  bootstrap doesn't like it, so we | 
| 17 |  |  |  |  |  |  | # need to load it manually. | 
| 18 |  |  |  |  |  |  | my $bootname = 'boot_B__Utils__OP'; | 
| 19 |  |  |  |  |  |  | if (my $boot_symbol_ref = DynaLoader::dl_find_symbol_anywhere($bootname)) { | 
| 20 |  |  |  |  |  |  | DynaLoader::dl_install_xsub(__PACKAGE__."::bootstrap", $boot_symbol_ref, __FILE__)->(__PACKAGE__, $VERSION); | 
| 21 |  |  |  |  |  |  | } | 
| 22 |  |  |  |  |  |  |  | 
| 23 |  |  |  |  |  |  | =head1 NAME | 
| 24 |  |  |  |  |  |  |  | 
| 25 |  |  |  |  |  |  | B::Utils::OP - op related utility functions for perl | 
| 26 |  |  |  |  |  |  |  | 
| 27 |  |  |  |  |  |  | =head1 VERSION | 
| 28 |  |  |  |  |  |  |  | 
| 29 |  |  |  |  |  |  | version 0.27 | 
| 30 |  |  |  |  |  |  |  | 
| 31 |  |  |  |  |  |  | =head1 SYNOPSIS | 
| 32 |  |  |  |  |  |  |  | 
| 33 |  |  |  |  |  |  | use B::Utils::OP qw(parent_op return_op); | 
| 34 |  |  |  |  |  |  | sub foo { | 
| 35 |  |  |  |  |  |  | my $pop = parent_op(0); | 
| 36 |  |  |  |  |  |  | my $rop = return_op(0); | 
| 37 |  |  |  |  |  |  | } | 
| 38 |  |  |  |  |  |  |  | 
| 39 |  |  |  |  |  |  | =head1 DESCRIPTION | 
| 40 |  |  |  |  |  |  |  | 
| 41 |  |  |  |  |  |  | sub foo { | 
| 42 |  |  |  |  |  |  | dothis(1); | 
| 43 |  |  |  |  |  |  | find_things(); | 
| 44 |  |  |  |  |  |  | return; | 
| 45 |  |  |  |  |  |  | } | 
| 46 |  |  |  |  |  |  |  | 
| 47 |  |  |  |  |  |  | has the following optree: | 
| 48 |  |  |  |  |  |  |  | 
| 49 |  |  |  |  |  |  | d  <1> leavesub[1 ref] K/REFC,1 ->(end) | 
| 50 |  |  |  |  |  |  | -     <@> lineseq KP ->d | 
| 51 |  |  |  |  |  |  | 1        <;> nextstate(main -371 bah.pl:8) v/2 ->2 | 
| 52 |  |  |  |  |  |  | 5        <1> entersub[t2] vKS/TARG,3 ->6 | 
| 53 |  |  |  |  |  |  | -           <1> ex-list K ->5 | 
| 54 |  |  |  |  |  |  | 2              <0> pushmark s ->3 | 
| 55 |  |  |  |  |  |  | 3              <$> const[IV 1] sM ->4 | 
| 56 |  |  |  |  |  |  | -              <1> ex-rv2cv sK/3 ->- | 
| 57 |  |  |  |  |  |  | 4                 <#> gv[*dothis] s ->5 | 
| 58 |  |  |  |  |  |  | 6        <;> nextstate(main -371 bah.pl:9) v/2 ->7 | 
| 59 |  |  |  |  |  |  |  | 
| 60 |  |  |  |  |  |  | 9        <1> entersub[t4] vKS/TARG,3 ->a | 
| 61 |  |  |  |  |  |  | -           <1> ex-list K ->9 | 
| 62 |  |  |  |  |  |  | 7              <0> pushmark s ->8 | 
| 63 |  |  |  |  |  |  | -              <1> ex-rv2cv sK/3 ->- | 
| 64 |  |  |  |  |  |  | 8                 <#> gv[*find_things] s/EARLYCV ->9 | 
| 65 |  |  |  |  |  |  |  | 
| 66 |  |  |  |  |  |  | a        <;> nextstate(main -371 bah.pl:10) v/2 ->b | 
| 67 |  |  |  |  |  |  | c        <@> return K ->d | 
| 68 |  |  |  |  |  |  | b           <0> pushmark s ->c | 
| 69 |  |  |  |  |  |  |  | 
| 70 |  |  |  |  |  |  | The C<find_things> in C<foo> is called in the C<entersub> in #9.  If | 
| 71 |  |  |  |  |  |  | you call C<parent_op> function with level 0, you get the C<nextstate> | 
| 72 |  |  |  |  |  |  | op that is before the entersub, which is #6.  And C<return_op> gives | 
| 73 |  |  |  |  |  |  | you the next op that the caller is returning to, in this case, the | 
| 74 |  |  |  |  |  |  | C<nextstate> in #a. | 
| 75 |  |  |  |  |  |  |  | 
| 76 |  |  |  |  |  |  | =head2 EXPORTED PERL FUNCTIONS | 
| 77 |  |  |  |  |  |  |  | 
| 78 |  |  |  |  |  |  | =over | 
| 79 |  |  |  |  |  |  |  | 
| 80 |  |  |  |  |  |  | =item parent_op($lv) | 
| 81 |  |  |  |  |  |  |  | 
| 82 |  |  |  |  |  |  | In runtime, returns the L<B::OP> object whose next is the C<entersub> of the current context up level C<$lv> | 
| 83 |  |  |  |  |  |  |  | 
| 84 |  |  |  |  |  |  | =item return_op($lv) | 
| 85 |  |  |  |  |  |  |  | 
| 86 |  |  |  |  |  |  | In runtime, returns the L<B::OP> object that the current context is returning to at level C<$lv> | 
| 87 |  |  |  |  |  |  |  | 
| 88 |  |  |  |  |  |  | =back | 
| 89 |  |  |  |  |  |  |  | 
| 90 |  |  |  |  |  |  | =head2 B::CV METHODS | 
| 91 |  |  |  |  |  |  |  | 
| 92 |  |  |  |  |  |  | =over | 
| 93 |  |  |  |  |  |  |  | 
| 94 |  |  |  |  |  |  | =item $cv->NEW_with_start($root, $start) | 
| 95 |  |  |  |  |  |  |  | 
| 96 |  |  |  |  |  |  | Clone the C<$cv> but with different C<$root> and C<$start> | 
| 97 |  |  |  |  |  |  |  | 
| 98 |  |  |  |  |  |  | =back | 
| 99 |  |  |  |  |  |  |  | 
| 100 |  |  |  |  |  |  | =head1 AUTHORS | 
| 101 |  |  |  |  |  |  |  | 
| 102 |  |  |  |  |  |  | Chia-liang Kao E<lt>clkao@clkao.orgE<gt> | 
| 103 |  |  |  |  |  |  |  | 
| 104 |  |  |  |  |  |  | =head1 COPYRIGHT | 
| 105 |  |  |  |  |  |  |  | 
| 106 |  |  |  |  |  |  | Copyright 2008 by Chia-liang Kao | 
| 107 |  |  |  |  |  |  |  | 
| 108 |  |  |  |  |  |  | This program is free software; you can redistribute it and/or modify it | 
| 109 |  |  |  |  |  |  | under the same terms as Perl itself. | 
| 110 |  |  |  |  |  |  |  | 
| 111 |  |  |  |  |  |  | See L<http://www.perl.com/perl/misc/Artistic.html> | 
| 112 |  |  |  |  |  |  |  | 
| 113 |  |  |  |  |  |  | =cut | 
| 114 |  |  |  |  |  |  |  | 
| 115 |  |  |  |  |  |  | 1; |