---
name: "B::Hooks::OP::Check"
section: "3pm"
platform: "linux"
package: "libb-hooks-op-check-perl"
version: "0.22-3+b2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/B::Hooks::OP::Check"
---

# B::Hooks::OP::Check(3pm)

Wrap OP check callbacks

## NAME

B::Hooks::OP::Check - Wrap OP check callbacks

## VERSION

version 0.22

## SYNOPSIS

```
    # include "hook_op_check.h"
    STATIC OP *my_const_check_op (pTHX_ OP *op, void *user_data) {
        /* ... */
        return op;
    }
    STATIC hook_op_check_id my_hook_id = 0;
    void
    setup ()
        CODE:
            my_hook_id = hook_op_check (OP_CONST, my_const_check_op, NULL);
    void
    teardown ()
        CODE:
            hook_op_check_remove (OP_CONST, my_hook_id);
```

## DESCRIPTION

This module provides a C API for XS modules to hook into the callbacks of `"PL_check"`.

ExtUtils::Depends is used to export all functions for other XS modules to use. Include the following in your Makefile.PL:

```
    my $pkg = ExtUtils::Depends->new('Your::XSModule', 'B::Hooks::OP::Check');
    WriteMakefile(
        ... # your normal makefile flags
        $pkg->get_makefile_vars,
    );
```

Your XS module can now include `"hook_op_check.h"`.

## TYPES

### typedef OP \*(\*hook\_op\_check\_cb) (pTHX\_ OP \*, void \*);

Type that callbacks need to implement.

### typedef UV hook\_op\_check\_id

Type to identify a callback.

## FUNCTIONS

### hook\_op\_check\_id hook\_op\_check (opcode type, hook\_op\_check\_cb cb, void \*user\_data)

Register the callback `"cb"` to be called after the `"PL_check"` function for opcodes of the given `"type"`. `"user_data"` will be passed to the callback as the last argument. Returns an id that can be used to remove the callback later on.

### void \*hook\_op\_check\_remove (opcode type, hook\_op\_check\_id id)

Remove the callback identified by `"id"`. Returns the user\_data that the callback had.

## SUPPORT

Bugs may be submitted through the RT bug tracker \<https://rt.cpan.org/Public/Dist/Display.html?Name=B-Hooks-OP-Check\> (or bug-B-Hooks-OP-Check@rt.cpan.org \<mailto:bug-B-Hooks-OP-Check@rt.cpan.org\>).

## AUTHOR

Florian Ragwitz \<rafl@debian.org\>

## CONTRIBUTORS

- •

  Karen Etheridge \<ether@cpan.org\>

- •

  Zefram \<zefram@fysh.org\>

- •

  Alexandr Ciornii \<alexchorny@gmail.com\>

## COPYRIGHT AND LICENCE

This software is copyright (c) 2008 by Florian Ragwitz.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.