--- old/src/share/vm/gc/g1/g1SATBCardTableModRefBS.hpp	2015-10-08 07:24:00.000000000 -1000
+++ new/src/share/vm/gc/g1/g1SATBCardTableModRefBS.hpp	2015-10-08 07:24:00.000000000 -1000
@@ -38,6 +38,7 @@
 // snapshot-at-the-beginning marking.
 
 class G1SATBCardTableModRefBS: public CardTableModRefBS {
+  friend class VMStructs;
 protected:
   enum G1CardValues {
     g1_young_gen = CT_MR_BS_last_reserved << 1
@@ -122,6 +123,9 @@
     jbyte val = _byte_map[card_index];
     return (val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val();
   }
+  virtual void write_ref_nmethod_pre(oop* dst, nmethod* nm);
+  virtual void write_ref_nmethod_post(oop* dst, nmethod* nm);
+
 };
 
 template<>