def prioritize_function(self, func_addr: int) -> None:
        """
        Prioritize the specified function and its callee functions.

        :param func_addr:   Address of the function to prioritize.
        """
        if not self.started:
            # hasn't started - cache all requests
            self.func_addrs_to_prioritize.add(func_addr)
            return

        if self.instance is None:
            return
        if self.ccc is None:
            return

        # find its callee functions
        callees = set(self.instance.kb.functions.callgraph.successors(func_addr))
        self.ccc.prioritize_functions({func_addr} | callees)

        Prioritize the specified function and its callee functions.

        :param func_addr:   Address of the function to prioritize.
        
angrmanagement/data/jobs/variable_recovery.py