Florian Ragwitz

NAME

B::OPCheck - PL_check hacks using Perl callbacks

SYNOPSIS

    use B::Generate; # to change things

    use B::OPCheck entersub => check => sub {
        my $op = shift; # op has been checked by normal PL_check
        sodomize($op);
    };

    foo(); # this entersub will have the callback triggered

DESCRIPTION

PL_check is an array indexed by opcode number (op_type) that contains function pointers invoked as the last stage of optree compilation, per op.

This hook is called in bottom up order, as the code is parsed and the optree is prepared.

This is how modules like autobox do their magic

This module provides an api for registering PL_check hooks lexically, allowing you to alter the behavior of certain ops using B::Generate from perl space.

CHECK TYPES

check

Called after normal PL_checking. The return value is ignored.

after

Not yet implemented.

Allows you to return a processed B::OP. The op has been processed by PL_check already.

before

Not yet implemented.

Allows you to return a processed B::OP to be passed to normal PL_check.

replace

Not yet implemented.

Allows you to return a processed B::OP yourself, skipping normal PL_check handling completely.

AUTHORS

Chia-liang Kao <clkao@clkao.org> Yuval Kogman <nothingmuch@woobling.org>

COPYRIGHT

Copyright 2008 by Chia-liang Kao, Yuval Kogman

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




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