--- /dev/null	2015-06-27 04:11:18.000000000 +0300
+++ new/src/share/vm/prims/unsafe.hpp	2015-06-27 04:11:18.000000000 +0300
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "utilities/globalDefinitions.hpp"
+
+class Unsafe {
+public:
+  // Note: The VM's obj_field and related accessors use byte-scaled
+  // ("unscaled") offsets, just as the unsafe methods do.
+
+  // However, the method Unsafe.fieldOffset explicitly declines to
+  // guarantee this.  The field offset values manipulated by the Java user
+  // through the Unsafe API are opaque cookies that just happen to be byte
+  // offsets.  We represent this state of affairs by passing the cookies
+  // through conversion functions when going between the VM and the Unsafe API.
+  // The conversion functions just happen to be no-ops at present.
+  enum {
+    final_bits   = 1,
+    offset_bits  = BitsPerLong - final_bits,
+
+    final_shift  = 0,
+    offset_shift = final_bits,
+
+    final_mask   = right_n_bits(final_bits)
+  };
+
+  static jlong field_offset_to_byte_offset(jlong field_offset) {
+    return (field_offset >> offset_shift);
+  }
+
+  static jlong field_offset_from_byte_offset(jlong byte_offset, bool is_final = false) {
+    return (byte_offset << offset_shift) | (is_final ? final_mask : 0);
+  }
+
+  static jint invocation_key_from_method_slot(jint slot) {
+    return slot;
+  }
+
+  static jint invocation_key_to_method_slot(jint key) {
+    return key;
+  }
+};
+