B::Hooks::OP::Check

Section: User Contributed Perl Documentation (3pm)
Updated: 2011-09-10
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NAME

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

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.