--- old/src/hotspot/share/gc/z/zOop.hpp	2019-04-10 18:50:43.024376700 -0400
+++ new/src/hotspot/share/gc/z/zOop.hpp	2019-04-10 18:50:42.099284200 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2017, 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
@@ -29,8 +29,13 @@
 
 class ZOop : public AllStatic {
 public:
-  static oop from_address(uintptr_t addr);
+  static oop to_oop(uintptr_t value);
   static uintptr_t to_address(oop o);
+
+  static bool is_good(oop o);
+  static bool is_finalizable_good(oop o);
+
+  static oop good(oop);
 };
 
 #endif // SHARE_GC_Z_ZOOP_HPP