Get the sorting key of a CFGJob instance.

        :param CFGJob job: the CFGJob object.
        :return: An integer that determines the order of this job in the queue.
        :rtype: int

def _job_sorting_key(self, job):
        """
        Get the sorting key of a CFGJob instance.

        :param CFGJob job: the CFGJob object.
        :return: An integer that determines the order of this job in the queue.
        :rtype: int
        """

        if self._base_graph is None:
            # we don't do sorting if there is no base_graph
            return 0

        MAX_JOBS = 1000000

        if job.addr not in self._node_addr_visiting_order:
            return MAX_JOBS

        return self._node_addr_visiting_order.index(job.addr)