def _call_to(self, from_node, to_func, ret_node):

        self._register_nodes(from_node)

        if to_func.is_syscall:
            self.transition_graph.add_edge(from_node, to_func, type='syscall')
        else:
            self.transition_graph.add_edge(from_node, to_func, type='call')
            if ret_node is not None:
                self._fakeret_to(from_node, ret_node)

        self._local_transition_graph = None
Registers an edge between the caller basic block and callee function.
dataset/ETHPy150Open angr/angr/angr/knowledge/function.py/Function._call_to