+/** A function called to free owned entities of a type. */
+typedef void (*free_entities_func)(ir_type *tp);
+
+/** A function called to free all automatic allocated entities of a type. */
+typedef void (*free_auto_entities_func)(ir_type *tp);
+
+/** A function called to set the mode of a type. */
+typedef void (*set_type_mode_func)(ir_type *tp, ir_mode *m);
+
+/** A function called to set the size of a type in bytes. */
+typedef void (*set_type_size_func)(ir_type *tp, unsigned size);
+
+/** A function called to get the number of compound members */
+typedef size_t (*get_n_members_func)(const ir_type *tp);
+
+/** A function called to get the pos'th compound member */
+typedef ir_entity *(*get_member_func)(const ir_type *tp, size_t pos);
+
+typedef size_t (*get_member_index_func)(const ir_type *tp, ir_entity *member);
+
+/** A function called to insert an entity into the type */
+typedef void (*insert_entity_func)(ir_type *tp, ir_entity *member);