--- a/hotspot/src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp	Mon Jan 26 17:00:39 2015 -0800
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp	Tue Jan 27 13:50:31 2015 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 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
@@ -32,11 +32,8 @@
 #include "runtime/orderAccess.inline.hpp"
 #include "runtime/thread.inline.hpp"
 
-G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap) :
-    CardTableModRefBS(whole_heap)
-{
-  _kind = G1SATBCT;
-}
+G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap, BarrierSet::Name kind) :
+  CardTableModRefBS(whole_heap, kind) { }
 
 void G1SATBCardTableModRefBS::enqueue(oop pre_val) {
   // Nulls should have been already filtered.
@@ -132,11 +129,10 @@
 
 G1SATBCardTableLoggingModRefBS::
 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap) :
-  G1SATBCardTableModRefBS(whole_heap),
+  G1SATBCardTableModRefBS(whole_heap, BarrierSet::G1SATBCTLogging),
   _dcqs(JavaThread::dirty_card_queue_set()),
   _listener()
 {
-  _kind = G1SATBCTLogging;
   _listener.set_card_table(this);
 }
 

--- a/hotspot/src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp	Mon Jan 26 17:00:39 2015 -0800
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp	Tue Jan 27 13:50:31 2015 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 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
@@ -43,6 +43,9 @@
     g1_young_gen = CT_MR_BS_last_reserved << 1
   };
 
+  G1SATBCardTableModRefBS(MemRegion whole_heap, BarrierSet::Name kind);
+  ~G1SATBCardTableModRefBS() { }
+
 public:
   static int g1_young_card_val()   { return g1_young_gen; }
 
@@ -50,8 +53,6 @@
   // pre-marking object graph.
   static void enqueue(oop pre_val);
 
-  G1SATBCardTableModRefBS(MemRegion whole_heap);
-
   bool is_a(BarrierSet::Name bsn) {
     return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn);
   }

--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp	Mon Jan 26 17:00:39 2015 -0800
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp	Tue Jan 27 13:50:31 2015 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 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
@@ -54,7 +54,7 @@
   };
 
   CardTableExtension(MemRegion whole_heap) :
-    CardTableModRefBS(whole_heap) { }
+    CardTableModRefBS(whole_heap, BarrierSet::CardTableModRef) { }
 
   // Too risky for the 4/10/02 putback
   // BarrierSet::Name kind() { return BarrierSet::CardTableExtension; }

--- a/hotspot/src/share/vm/memory/barrierSet.hpp	Mon Jan 26 17:00:39 2015 -0800
+++ b/hotspot/src/share/vm/memory/barrierSet.hpp	Tue Jan 27 13:50:31 2015 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 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
@@ -40,8 +40,7 @@
     CardTableExtension,
     G1SATBCT,
     G1SATBCTLogging,
-    Other,
-    Uninit
+    Other
   };
 
   enum Flags {
@@ -57,9 +56,11 @@
   static const int _max_covered_regions = 2;
   Name _kind;
 
+  BarrierSet(Name kind) : _kind(kind) { }
+  ~BarrierSet() { }
+
 public:
 
-  BarrierSet() { _kind = Uninit; }
   // To get around prohibition on RTTI.
   BarrierSet::Name kind() { return _kind; }
   virtual bool is_a(BarrierSet::Name bsn) = 0;

--- a/hotspot/src/share/vm/memory/cardTableModRefBS.cpp	Mon Jan 26 17:00:39 2015 -0800
+++ b/hotspot/src/share/vm/memory/cardTableModRefBS.cpp	Tue Jan 27 13:50:31 2015 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 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
@@ -53,8 +53,8 @@
   return align_size_up(_guard_index + 1, MAX2(_page_size, granularity));
 }
 
-CardTableModRefBS::CardTableModRefBS(MemRegion whole_heap) :
-  ModRefBarrierSet(),
+CardTableModRefBS::CardTableModRefBS(MemRegion whole_heap, BarrierSet::Name kind) :
+  ModRefBarrierSet(kind),
   _whole_heap(whole_heap),
   _guard_index(0),
   _guard_region(),
@@ -72,8 +72,6 @@
   _lowest_non_clean_base_chunk_index(NULL),
   _last_LNC_resizing_collection(NULL)
 {
-  _kind = BarrierSet::CardTableModRef;
-
   assert((uintptr_t(_whole_heap.start())  & (card_size - 1))  == 0, "heap must start at card boundary");
   assert((uintptr_t(_whole_heap.end()) & (card_size - 1))  == 0, "heap must end at card boundary");
 

--- a/hotspot/src/share/vm/memory/cardTableModRefBS.hpp	Mon Jan 26 17:00:39 2015 -0800
+++ b/hotspot/src/share/vm/memory/cardTableModRefBS.hpp	Tue Jan 27 13:50:31 2015 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 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
@@ -284,20 +284,22 @@
     return bsn == BarrierSet::CardTableModRef || ModRefBarrierSet::is_a(bsn);
   }
 
-  CardTableModRefBS(MemRegion whole_heap);
-  ~CardTableModRefBS();
-
   virtual void initialize();
 
   // *** Barrier set functions.
 
   bool has_write_ref_pre_barrier() { return false; }
 
+protected:
+
+  CardTableModRefBS(MemRegion whole_heap, BarrierSet::Name kind);
+  ~CardTableModRefBS();
+
   // Record a reference update. Note that these versions are precise!
   // The scanning code has to handle the fact that the write barrier may be
   // either precise or imprecise. We make non-virtual inline variants of
   // these functions here for performance.
-protected:
+
   void write_ref_field_work(oop obj, size_t offset, oop newVal);
   virtual void write_ref_field_work(void* field, oop newVal, bool release = false);
 public:
@@ -478,7 +480,7 @@
   bool card_may_have_been_dirty(jbyte cv);
 public:
   CardTableModRefBSForCTRS(MemRegion whole_heap) :
-    CardTableModRefBS(whole_heap) {}
+    CardTableModRefBS(whole_heap, BarrierSet::CardTableModRef) {}
 
   void set_CTRS(CardTableRS* rs) { _rs = rs; }
 };

--- a/hotspot/src/share/vm/memory/modRefBarrierSet.hpp	Mon Jan 26 17:00:39 2015 -0800
+++ b/hotspot/src/share/vm/memory/modRefBarrierSet.hpp	Tue Jan 27 13:50:31 2015 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 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
@@ -37,8 +37,6 @@
 class ModRefBarrierSet: public BarrierSet {
 public:
 
-  ModRefBarrierSet() { _kind = BarrierSet::ModRef; }
-
   bool is_a(BarrierSet::Name bsn) {
     return bsn == BarrierSet::ModRef;
   }
@@ -59,7 +57,12 @@
 
   void read_ref_field(void* field) {}
   void read_prim_field(HeapWord* field, size_t bytes) {}
+
 protected:
+
+  ModRefBarrierSet(BarrierSet::Name kind) : BarrierSet(kind) { }
+  ~ModRefBarrierSet() { }
+
   virtual void write_ref_field_work(void* field, oop new_val, bool release = false) = 0;
 public:
   void write_prim_field(HeapWord* field, size_t bytes,