--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/agent/src/share/classes/sun/jvm/hotspot/compiler/ImmutableOopMapPair.java	Tue May 05 16:50:25 2015 +0200
@@ -0,0 +1,74 @@
+/*
+ * 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.
+ *
+ */
+
+package sun.jvm.hotspot.compiler;
+
+import sun.jvm.hotspot.debugger.Address;
+import sun.jvm.hotspot.runtime.VM;
+import sun.jvm.hotspot.types.CIntegerField;
+import sun.jvm.hotspot.types.Type;
+import sun.jvm.hotspot.types.TypeDataBase;
+
+import java.util.Observable;
+import java.util.Observer;
+
+public class ImmutableOopMapPair {
+  private static CIntegerField pcField;
+  private static CIntegerField offsetField;
+  private static long classSize;
+
+  static {
+    VM.registerVMInitializedObserver(new Observer() {
+      public void update(Observable o, Object data) {
+        initialize(VM.getVM().getTypeDataBase());
+      }
+    });
+  }
+
+  private final Address address;
+
+  public ImmutableOopMapPair(Address address) {
+    this.address = address;
+  }
+
+  public static long classSize() {
+    return classSize;
+  }
+
+  public int getPC() {
+    return (int) pcField.getValue(address);
+  }
+
+  public int getOffset() {
+    return (int) offsetField.getValue(address);
+  }
+
+  private static void initialize(TypeDataBase db) {
+    Type type = db.lookupType("ImmutableOopMapSet");
+
+    pcField = type.getCIntegerField("_pc_offset");
+    offsetField = type.getCIntegerField("_oopmap_offset");
+    classSize = type.getSize();
+  }
+}