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

       Florian Ragwitz <rafl@debian.org>

TYPESOP*(*hook_op_check_entersubforcv_cb)(pTHX_OP*,CV*,void*)

       The type the handlers need to implement.

   FUNCTIONShook_op_check_idhook_op_check_entersubforcv(CV*cv,hook_op_check_entersubforcv_cbcb,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_idid)

       Remove a previously registered handler referred to by "id".

       Returns the user data that was associated with the handler.

       Copyright (c) 2008, 2009 Florian Ragwitz

       Copyright (c) 2011, 2012, 2017 Andrew Main (Zefram)

       This module is free software.

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

perl v5.40.0                                       2024-10-20             B::Hooks::OP::C...::EntersubForCV(3pm)

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

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.

       B::Hooks::OP::Check

FromPerl
           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

   FromC/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);