+/**
+ * Ensure that edges of a given kind are activated.
+ *
+ * @param irg the IR graph
+ * @param kind the edge kind
+ *
+ * @return 0 if edges was deactivated before the call, 1 else
+ */
+int edges_assure_kind(ir_graph *irg, ir_edge_kind_t kind);
+
+void edges_node_deleted(ir_node *irn, ir_graph *irg);
+
+/**
+ * Notify normal and block edges.
+ */
+void edges_notify_edge(ir_node *src, int pos, ir_node *tgt, ir_node *old_tgt, ir_graph *irg);