NAME

B::Hooks::OP::Check::EntersubForCV - Invoke callbacks on construction of entersub OPs for certain CVs

SYNOPSIS

From Perl

    sub foo {}

    use B::Hooks::OP::Check::EntersubForCV
        \&foo => sub { warn "entersub for foo() being compiled" };

    foo(); # callback is invoked when this like is compiled

    no B::Hooks::OP::Check::EntersubForCV \&foo;

    foo(); # callback isn't invoked

From C/XS

    #include "hook_op_check_entersubforcv.h"

    STATIC OP *
    my_callback (pTHX_ OP *op, CV *cv, void *user_data) {
        /* ... */
        return op;
    }

    hook_op_check_id id;

    /* register callback */
    id = hook_op_check_entersubforcv (cv, my_callback, NULL);

    /* unregister */
    hook_op_check_entersubforcv_remove (id);

DESCRIPTION

Perl API

import / register

    use B::Hooks::OP::Check::EntersubForCV
        \&code => \&handler;

    # or
    my $id = B::Hooks::OP::Check::EntersubForCV::register(\&code => \&handler);

Register handler to be executed when an entersub opcode for the CV code points to is compiled.

When using register an id that can be used for later removal of the handler using unregister is returned.

unimport / unregister

    no B::Hooks::OP::Check::EntersubForCV \&code;

    # or
    B::Hooks::OP::Check::EntersubForCV::unregister($id);

Stop calling the registered handler for code for all entersubs after this.

C API

TYPES

OP *(*hook_op_check_entersubforcv_cb) (pTHX_ OP *, CV *, void *)

The type the handlers need to implement.

FUNCTIONS

hook_op_check_id hook_op_check_entersubforcv (CV *cv, hook_op_check_entersubforcv_cb cb, void *user_data)

Register the callback cb to be called when an entersub opcode for cv is compiled. user_data will be passed to the callback as the last argument.

Returns an id that can be used to remove the handler using hook_op_check_entersubforcv_remove.

void *hook_op_check_entersubforcv_remove (hook_op_check_id id)

Remove a previously registered handler referred to by id.

Returns the user data that was associated with the handler.

SEE ALSO

B::Hooks::OP::Check

AUTHOR

Florian Ragwitz <rafl@debian.org>

COPYRIGHT AND LICENSE

Copyright (c) 2008, 2009 Florian Ragwitz

This module is free software.

You may distribute this code under the same terms as Perl itself.