--- a/src/hotspot/share/oops/klass.hpp	Thu Oct 04 14:03:13 2018 +0200
+++ b/src/hotspot/share/oops/klass.hpp	Thu Oct 04 16:39:07 2018 +0200
@@ -715,6 +715,10 @@
 
   virtual void oop_verify_on(oop obj, outputStream* st);
 
+  // for error reporting
+  static Klass* decode_klass_raw(narrowKlass narrow_klass);
+  static bool is_valid(Klass* k);
+
   static bool is_null(narrowKlass obj);
   static bool is_null(Klass* obj);