Binary package “libb-hooks-op-check-entersubforcv-perl” in ubuntu bionic

Invoke callbacks on construction of entersub OPs for certain CVs

 B::Hooks::OP::Check::EntersubForCV is a perl module to register and
 unregister handlers to be executed when an entersub opcode for a
 given CV is compiled.
 .
 This enables you to hook one subroutine onto another, and have it
 executed before the originally called subroutine.