diff -r 75e385f68b7e -r 627b6b94e774 jitcraft/Barriers.h
--- a/jitcraft/Barriers.h	Sat Jun 30 19:38:53 2012 -0700
+++ b/jitcraft/Barriers.h	Sat Jun 30 20:20:39 2012 -0700
@@ -55,6 +55,39 @@
     }
 };
 
+// Used to store unbarriered heap locations.
+template <typename T>
+class Barriered
+{
+    Object *obj_;
+
+  public:
+    Barriered()
+      : obj_(NULL)
+    {
+    }
+
+    T *operator ->() const {
+        return operator *();
+    }
+    T *operator *() const {
+        return static_cast<T *>(obj_);
+    }
+    Barriered &operator =(T *obj) {
+        obj_ = obj;
+        return *this;
+    }
+    Object **addr() {
+        return &obj_;
+    }
+    operator bool () const {
+        return !!obj_;
+    }
+    operator T*() const {
+        return static_cast<T *>(obj_);
+    }
+};
+
 }
 
 #endif // _include_jitcraft_barriers_h_