+/**
+ * the type walk function
+ *
+ * @param tore points to the visited type or entity
+ * @param env free environment pointer
+ */
+typedef void type_walk_func(type_or_ent *tore, void *env);
+
+/**
+ * the class walk function
+ *
+ * @param clss points to the visited class
+ * @param env free environment pointer
+ */
+typedef void class_walk_func(type *clss, void *env);
+
+/**
+ Touches every type and entity in unspecified order. If new
+ types/entities are created during the traversal these will
+ be visited, too. */
+void type_walk(type_walk_func *pre,
+ type_walk_func *post,
+ void *env);
+
+/** walks over all type information reachable from irg */
+void type_walk_irg(ir_graph *irg,
+ type_walk_func *pre,
+ type_walk_func *post,
+ void *env);
+
+/**
+ Touches every class in specified order:
+ - first the super class
+ - second the class itself
+ - third the sub classes. If new classes are created
+ during the traversal these will be visited, too.
+
+ @todo should be named class-walk
+
+ @deprecated will be removed?
+*/
+void type_walk_super2sub(type_walk_func *pre,
+ type_walk_func *post,
+ void *env);
+
+/**
+ Touches every class in specified order:
+ - first the super class
+ - second the class itself
+ If new classes are created during the traversal these
+ will be visited, too. */
+void type_walk_super(type_walk_func *pre,
+ type_walk_func *post,
+ void *env);
+
+/** Same as type_walk_super2sub, but visits only class types.
+ Executes pre for a class if all superclasses have been visited.
+ Then iterates to subclasses. Executes post after return from
+ subclass.
+ Does not visit global type, frame types.
+
+ @bug ?? something is wrong with this.
+*/
+void class_walk_super2sub(class_walk_func *pre,
+ class_walk_func *post,
+ void *env);
+
+/**
+ * the entity walk function
+ *
+ * @param ent points to the visited entity
+ * @param env free environment pointer
+ */
+typedef void entity_walk_func(entity *ent, void *env);