Generate CodeNodes for target and source, if no source node add node
        for function, otherwise creates fake return to in function manager

        :param int addr: target address
        :param angr.analyses.CFGNode src_node: source node
        :param int src_func_addr: address of function
        :param confirmed: used as attribute on eventual digraph
        :return: None

def _function_add_fakeret_edge(self, addr, src_node, src_func_addr, confirmed=None):
        """
        Generate CodeNodes for target and source, if no source node add node
        for function, otherwise creates fake return to in function manager

        :param int addr: target address
        :param angr.analyses.CFGNode src_node: source node
        :param int src_func_addr: address of function
        :param confirmed: used as attribute on eventual digraph
        :return: None
        """

        target_node = self._nodes.get(addr, None)
        if target_node is None:
            target_snippet = self._to_snippet(addr=addr, base_state=self._base_state)
        else:
            target_snippet = self._to_snippet(cfg_node=target_node)

        if src_node is None:
            self.kb.functions._add_node(src_func_addr, target_snippet)
        else:
            src_snippet = self._to_snippet(cfg_node=src_node)
            self.kb.functions._add_fakeret_to(src_func_addr, src_snippet, target_snippet, confirmed=confirmed)