--- a/hotspot/src/share/vm/gc/cms/concurrentMarkSweepGeneration.cpp	Fri Oct 16 10:20:59 2015 +0200
+++ b/hotspot/src/share/vm/gc/cms/concurrentMarkSweepGeneration.cpp	Fri Oct 16 14:55:09 2015 -0400
@@ -6045,8 +6045,8 @@
     _span(span),
     _bitMap(bitMap)
 {
-    assert(_ref_processor == NULL, "deliberately left NULL");
-    assert(_bitMap->covers(_span), "_bitMap/_span mismatch");
+  assert(ref_processor() == NULL, "deliberately left NULL");
+  assert(_bitMap->covers(_span), "_bitMap/_span mismatch");
 }
 
 void MarkRefsIntoClosure::do_oop(oop obj) {
@@ -6067,8 +6067,8 @@
     _span(span),
     _bitMap(bitMap)
 {
-    assert(_ref_processor == NULL, "deliberately left NULL");
-    assert(_bitMap->covers(_span), "_bitMap/_span mismatch");
+  assert(ref_processor() == NULL, "deliberately left NULL");
+  assert(_bitMap->covers(_span), "_bitMap/_span mismatch");
 }
 
 void Par_MarkRefsIntoClosure::do_oop(oop obj) {
@@ -6091,8 +6091,8 @@
     _verification_bm(verification_bm),
     _cms_bm(cms_bm)
 {
-    assert(_ref_processor == NULL, "deliberately left NULL");
-    assert(_verification_bm->covers(_span), "_verification_bm/_span mismatch");
+  assert(ref_processor() == NULL, "deliberately left NULL");
+  assert(_verification_bm->covers(_span), "_verification_bm/_span mismatch");
 }
 
 void MarkRefsIntoVerifyClosure::do_oop(oop obj) {
@@ -6134,8 +6134,9 @@
   _concurrent_precleaning(concurrent_precleaning),
   _freelistLock(NULL)
 {
-  _ref_processor = rp;
-  assert(_ref_processor != NULL, "_ref_processor shouldn't be NULL");
+  // FIXME: Should initialize in base class constructor.
+  assert(rp != NULL, "ref_processor shouldn't be NULL");
+  set_ref_processor_internal(rp);
 }
 
 // This closure is used to mark refs into the CMS generation at the
@@ -6240,8 +6241,9 @@
                        ((uint)CMSWorkQueueDrainThreshold * ParallelGCThreads))),
   _par_pushAndMarkClosure(collector, span, rp, bit_map, work_queue)
 {
-  _ref_processor = rp;
-  assert(_ref_processor != NULL, "_ref_processor shouldn't be NULL");
+  // FIXME: Should initialize in base class constructor.
+  assert(rp != NULL, "ref_processor shouldn't be NULL");
+  set_ref_processor_internal(rp);
 }
 
 // This closure is used to mark refs into the CMS generation at the
@@ -7091,7 +7093,7 @@
   _mark_stack(mark_stack),
   _concurrent_precleaning(concurrent_precleaning)
 {
-  assert(_ref_processor != NULL, "_ref_processor shouldn't be NULL");
+  assert(ref_processor() != NULL, "ref_processor shouldn't be NULL");
 }
 
 // Grey object rescan during pre-cleaning and second checkpoint phases --
@@ -7162,7 +7164,7 @@
   _bit_map(bit_map),
   _work_queue(work_queue)
 {
-  assert(_ref_processor != NULL, "_ref_processor shouldn't be NULL");
+  assert(ref_processor() != NULL, "ref_processor shouldn't be NULL");
 }
 
 void PushAndMarkClosure::do_oop(oop* p)       { PushAndMarkClosure::do_oop_work(p); }

--- a/hotspot/src/share/vm/gc/g1/concurrentMark.cpp	Fri Oct 16 10:20:59 2015 +0200
+++ b/hotspot/src/share/vm/gc/g1/concurrentMark.cpp	Fri Oct 16 14:55:09 2015 -0400
@@ -3084,17 +3084,21 @@
   }
 };
 
+static ReferenceProcessor* get_cm_oop_closure_ref_processor(G1CollectedHeap* g1h) {
+  ReferenceProcessor* result = NULL;
+  if (G1UseConcMarkReferenceProcessing) {
+    result = g1h->ref_processor_cm();
+    assert(result != NULL, "should not be NULL");
+  }
+  return result;
+}
+
 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h,
                                ConcurrentMark* cm,
                                CMTask* task)
-  : _g1h(g1h), _cm(cm), _task(task) {
-  assert(_ref_processor == NULL, "should be initialized to NULL");
-
-  if (G1UseConcMarkReferenceProcessing) {
-    _ref_processor = g1h->ref_processor_cm();
-    assert(_ref_processor != NULL, "should not be NULL");
-  }
-}
+  : MetadataAwareOopClosure(get_cm_oop_closure_ref_processor(g1h)),
+    _g1h(g1h), _cm(cm), _task(task)
+{ }
 
 void CMTask::setup_for_region(HeapRegion* hr) {
   assert(hr != NULL,

--- a/hotspot/src/share/vm/gc/g1/g1OopClosures.hpp	Fri Oct 16 10:20:59 2015 +0200
+++ b/hotspot/src/share/vm/gc/g1/g1OopClosures.hpp	Fri Oct 16 14:55:09 2015 -0400
@@ -80,7 +80,9 @@
   virtual void do_oop(oop* p)          { do_oop_nv(p); }
   virtual void do_oop(narrowOop* p)    { do_oop_nv(p); }
 
-  void set_ref_processor(ReferenceProcessor* ref_processor) { _ref_processor = ref_processor; }
+  void set_ref_processor(ReferenceProcessor* rp) {
+    set_ref_processor_internal(rp);
+  }
 };
 
 // Add back base class for metadata
@@ -127,7 +129,7 @@
 public:
   G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
       G1ParCopyHelper(g1, par_scan_state) {
-    assert(_ref_processor == NULL, "sanity");
+    assert(ref_processor() == NULL, "sanity");
   }
 
   template <class T> void do_oop_nv(T* p) { do_oop_work(p); }

--- a/hotspot/src/share/vm/gc/serial/markSweep.hpp	Fri Oct 16 10:20:59 2015 +0200
+++ b/hotspot/src/share/vm/gc/serial/markSweep.hpp	Fri Oct 16 14:55:09 2015 -0400
@@ -196,7 +196,9 @@
   virtual void do_cld(ClassLoaderData* cld);
   void do_cld_nv(ClassLoaderData* cld);
 
-  void set_ref_processor(ReferenceProcessor* rp) { _ref_processor = rp; }
+  void set_ref_processor(ReferenceProcessor* rp) {
+    set_ref_processor_internal(rp);
+  }
 };
 
 class PreservedMark VALUE_OBJ_CLASS_SPEC {

--- a/hotspot/src/share/vm/gc/shared/genOopClosures.hpp	Fri Oct 16 10:20:59 2015 +0200
+++ b/hotspot/src/share/vm/gc/shared/genOopClosures.hpp	Fri Oct 16 14:55:09 2015 -0400
@@ -157,7 +157,7 @@
   }
  public:
   FilteringClosure(HeapWord* boundary, ExtendedOopClosure* cl) :
-    ExtendedOopClosure(cl->_ref_processor), _boundary(boundary),
+    ExtendedOopClosure(cl->ref_processor()), _boundary(boundary),
     _cl(cl) {}
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);

--- a/hotspot/src/share/vm/memory/iterator.hpp	Fri Oct 16 10:20:59 2015 +0200
+++ b/hotspot/src/share/vm/memory/iterator.hpp	Fri Oct 16 14:55:09 2015 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2015, 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
@@ -51,10 +51,18 @@
 // This is needed by the GC and is extracted to a separate type to not
 // pollute the OopClosure interface.
 class ExtendedOopClosure : public OopClosure {
- public:
+ private:
   ReferenceProcessor* _ref_processor;
+
+ protected:
   ExtendedOopClosure(ReferenceProcessor* rp) : _ref_processor(rp) { }
-  ExtendedOopClosure() : OopClosure(), _ref_processor(NULL) { }
+  ExtendedOopClosure() : _ref_processor(NULL) { }
+  ~ExtendedOopClosure() { }
+
+  void set_ref_processor_internal(ReferenceProcessor* rp) { _ref_processor = rp; }
+
+ public:
+  ReferenceProcessor* ref_processor() const { return _ref_processor; }
 
   // If the do_metadata functions return "true",
   // we invoke the following when running oop_iterate():

--- a/hotspot/src/share/vm/oops/instanceRefKlass.inline.hpp	Fri Oct 16 10:20:59 2015 +0200
+++ b/hotspot/src/share/vm/oops/instanceRefKlass.inline.hpp	Fri Oct 16 14:55:09 2015 -0400
@@ -43,7 +43,7 @@
 
   T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
   T heap_oop = oopDesc::load_heap_oop(referent_addr);
-  ReferenceProcessor* rp = closure->_ref_processor;
+  ReferenceProcessor* rp = closure->ref_processor();
   if (!oopDesc::is_null(heap_oop)) {
     oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
     if (!referent->is_gc_marked() && (rp != NULL) &&