--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/oops/MethodCounters.java	Tue Apr 09 17:17:41 2013 -0400
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2013, 2013, 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.oops;
+
+import java.io.*;
+import java.util.*;
+import sun.jvm.hotspot.debugger.*;
+import sun.jvm.hotspot.runtime.*;
+import sun.jvm.hotspot.types.*;
+import sun.jvm.hotspot.utilities.*;
+
+public class MethodCounters extends Metadata {
+  public MethodCounters(Address addr) {
+    super(addr);
+  }
+
+  static {
+    VM.registerVMInitializedObserver(new Observer() {
+        public void update(Observable o, Object data) {
+          initialize(VM.getVM().getTypeDataBase());
+        }
+      });
+  }
+
+  private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
+    Type type      = db.lookupType("MethodCounters");
+
+    interpreterInvocationCountField = new CIntField(type.getCIntegerField("_interpreter_invocation_count"), 0);
+    interpreterThrowoutCountField = new CIntField(type.getCIntegerField("_interpreter_throwout_count"), 0);
+    if (!VM.getVM().isCore()) {
+      invocationCounter        = new CIntField(type.getCIntegerField("_invocation_counter"), 0);
+      backedgeCounter          = new CIntField(type.getCIntegerField("_backedge_counter"), 0);
+    }
+  }
+
+  private static CIntField interpreterInvocationCountField;
+  private static CIntField interpreterThrowoutCountField;
+  private static CIntField invocationCounter;
+  private static CIntField backedgeCounter;
+
+  public int interpreterInvocationCount() {
+    return (int) interpreterInvocationCountField.getValue(this);
+  }
+
+  public int interpreterThrowoutCount() {
+    return (int) interpreterThrowoutCountField.getValue(this);
+  }
+  public long getInvocationCounter() {
+    if (Assert.ASSERTS_ENABLED) {
+      Assert.that(!VM.getVM().isCore(), "must not be used in core build");
+    }
+    return invocationCounter.getValue(this);
+  }
+  public long getBackedgeCounter() {
+    if (Assert.ASSERTS_ENABLED) {
+      Assert.that(!VM.getVM().isCore(), "must not be used in core build");
+    }
+    return backedgeCounter.getValue(this);
+  }
+
+  public void printValueOn(PrintStream tty) {
+  }
+}
+