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 triggeredDESCRIPTION
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.