Generate CodeNodes for return_to_addr, add this node for function to
        function manager generating new edge

        :param int return_from_addr: target address
        :param int return_to_addr: target address
        :param int function_addr: address of function
        :return: None

def _function_add_return_edge(self, return_from_addr, return_to_addr, function_addr):
        """
        Generate CodeNodes for return_to_addr, add this node for function to
        function manager generating new edge

        :param int return_from_addr: target address
        :param int return_to_addr: target address
        :param int function_addr: address of function
        :return: None
        """

        return_to_node = self._nodes.get(return_to_addr, None)
        if return_to_node is None:
            return_to_snippet = self._to_snippet(addr=return_to_addr, base_state=self._base_state)
            to_outside = False
        else:
            return_to_snippet = self._to_snippet(cfg_node=return_to_node)
            to_outside = return_to_node.function_address != function_addr

        self.kb.functions._add_return_from_call(function_addr, return_from_addr, return_to_snippet,
                                                to_outside=to_outside)