--- a/hotspot/src/share/vm/oops/klass.cpp	Thu Jan 28 16:30:37 2016 -0800
+++ b/hotspot/src/share/vm/oops/klass.cpp	Wed Feb 03 01:35:25 2016 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -673,6 +673,28 @@
   guarantee(obj->klass()->is_klass(), "klass field is not a klass");
 }
 
+klassVtable* Klass::vtable() const {
+  return new klassVtable(this, start_of_vtable(), vtable_length() / vtableEntry::size());
+}
+
+vtableEntry* Klass::start_of_vtable() const {
+  return (vtableEntry*) ((address)this + in_bytes(vtable_start_offset()));
+}
+
+Method* Klass::method_at_vtable(int index)  {
+#ifndef PRODUCT
+  assert(index >= 0, "valid vtable index");
+  if (DebugVtables) {
+    verify_vtable_index(index);
+  }
+#endif
+  return start_of_vtable()[index].method();
+}
+
+ByteSize Klass::vtable_start_offset() {
+  return in_ByteSize(InstanceKlass::header_size() * wordSize);
+}
+
 #ifndef PRODUCT
 
 bool Klass::verify_vtable_index(int i) {