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_ppaddr.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.

SEE ALSO
    B::Hooks::OP::Check

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.

