--- a/hotspot/src/share/vm/opto/graphKit.cpp	Mon Feb 16 08:47:39 2015 -0800
+++ b/hotspot/src/share/vm/opto/graphKit.cpp	Mon Feb 16 21:24:39 2015 +0100
@@ -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
@@ -3754,6 +3754,17 @@
   sync_kit(ideal);
 }
 
+Node* GraphKit::byte_map_base_node() {
+  // Get base of card map
+  CardTableModRefBS* ct = (CardTableModRefBS*)(Universe::heap()->barrier_set());
+  assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust users of this code");
+  if (ct->byte_map_base != NULL) {
+    return makecon(TypeRawPtr::make((address)ct->byte_map_base));
+  } else {
+    return null();
+  }
+}
+
 // vanilla/CMS post barrier
 // Insert a write-barrier store.  This is to let generational GC work; we have
 // to flag all oop-stores before the next GC point.