+/** Returns true if the operation is a forking control flow
+ * operation: Cond. */
+int is_forking_op(const ir_node *node);
+
+/** Return the type associated with the value produced by n
+ * if the node remarks this type as it is the case for
+ * Cast, Const, SymConst and some Proj nodes. */
+type *get_irn_type(ir_node *n);
+
+/**
+ * Access custom node data.
+ * The data must have been registered with
+ * register_additional_node_data() before.
+ * @param node The ir node to get the data from.
+ * @param type The type of the data you registered.
+ * @param off The value returned by register_additional_node_data().
+ * @return A pointer of type @p type.
+ */
+#define get_irn_data(node,type,off) \
+ (assert(off > 0 && "Invalid node data offset"), (type *) ((char *) (node) - (off)))
+
+/**
+ * Get the pointer to the node some custom data belongs to.
+ * @param data The pointer to the custom data.
+ * @param off The number as returned by register_additional_node_data().
+ * @return A pointer to the ir node the custom data belongs to.
+ */
+#define get_irn_data_base(data,off) \
+ (assert(off > 0 && "Invalid node data offset"), (ir_node *) ((char *) (data) + (off)))
+
+/**
+ * Request additional data to be allocated with an ir node.
+ * @param size The size of the additional data required.
+ * @return A positive number, if the operation was successful, which
+ * must be passed to the access macro get_irn_data(), 0 if the
+ * registration failed.
+ */
+unsigned register_additional_node_data(unsigned size);
+
+
+/*-----------------------------------------------------------------*/
+/** Debug aides **/
+/*-----------------------------------------------------------------*/
+
+
+/** Debug print the node.
+ *
+ * Writes the node, all its attributes and the predecessors to stdout if DEBUG_libfirm
+ * is set. Else does nothing. */
+void dump_irn(ir_node *n);
+