NAME

B::Hooks::OP::PPAddr - Hook into opcode execution

SYNOPSIS

    #include "hook_op_check.h"
    #include "hook_op_ppaddr.h"

    STATIC OP *
    execute_entereval (pTHX_ OP *op, void *user_data) {
        ...
    }

    STATIC OP *
    check_entereval (pTHX_ OP *op, void *user_data) {
        hook_op_ppaddr (op, execute_entereval, NULL);
    }

    hook_op_check (OP_ENTEREVAL, check_entereval, NULL);

DESCRIPTION

This module provides a c api for XS modules to hook into the execution of perl opcodes.

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::PPAddr');
    WriteMakefile(
        ... # your normal makefile flags
        $pkg->get_makefile_vars,
    );

Your XS module can now include hook_op_check.h.

TYPES

typedef OP *(*hook_op_ppaddr_cb_t) (pTHX_ OP *, void *user_data)

Type that callbacks need to implement.

FUNCTIONS

void hook_op_ppaddr (OP *op, hook_op_ppaddr_cb_t cb, void *user_data)

Replace the function to execute op with the callback cb. user_data will be passed to the callback as the last argument.

void hook_op_ppaddr_around (OP *op, hook_op_ppaddr_cb_t before, hook_op_ppaddr_cb_t after, void *user_data)

Register the callbacks before and after to be called before and after the execution of op. user_data will be passed to the callback as the last argument.

AUTHOR

Florian Ragwitz <rafl@debian.org>

COPYRIGHT AND LICENSE

Copyright (c) 2008 Florian Ragwitz

This module is free software.

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