diff -r d9132bdf6c30 -r 9d62da00bf15 src/hotspot/share/gc/z/zHeapIterator.cpp
--- a/src/hotspot/share/gc/z/zHeapIterator.cpp	Mon Jun 25 12:44:52 2018 +0200
+++ b/src/hotspot/share/gc/z/zHeapIterator.cpp	Sat May 26 06:59:49 2018 +0200
@@ -28,6 +28,7 @@
 #include "gc/z/zHeapIterator.hpp"
 #include "gc/z/zOop.inline.hpp"
 #include "gc/z/zRootsIterator.hpp"
+#include "memory/iterator.inline.hpp"
 #include "oops/oop.inline.hpp"
 #include "utilities/bitMap.inline.hpp"
 #include "utilities/stack.inline.hpp"
@@ -73,7 +74,7 @@
   }
 };
 
-class ZHeapIteratorPushOopClosure : public ExtendedOopClosure {
+class ZHeapIteratorPushOopClosure : public BasicOopIterateClosure {
 private:
   ZHeapIterator* const _iter;
   const oop            _base;
@@ -83,23 +84,15 @@
       _iter(iter),
       _base(base) {}
 
-  void do_oop_nv(oop* p) {
+  virtual void do_oop(oop* p) {
     const oop obj = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(_base, _base->field_offset(p));
     _iter->push(obj);
   }
 
-  void do_oop_nv(narrowOop* p) {
+  virtual void do_oop(narrowOop* p) {
     ShouldNotReachHere();
   }
 
-  virtual void do_oop(oop* p) {
-    do_oop_nv(p);
-  }
-
-  virtual void do_oop(narrowOop* p) {
-    do_oop_nv(p);
-  }
-
 #ifdef ASSERT
   virtual bool should_verify_oops() {
     return false;