--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/code/VMRegImpl.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package sun.jvm.hotspot.code;
+
+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 VMRegImpl {
+
+  private static VMReg stack0;
+  private static int stack0Val;
+  private static Address stack0Addr;
+  private static AddressField regNameField;
+
+  static {
+    VM.registerVMInitializedObserver(new Observer() {
+        public void update(Observable o, Object data) {
+          initialize(VM.getVM().getTypeDataBase());
+        }
+      });
+  }
+
+  private static void initialize(TypeDataBase db) {
+    Type type = db.lookupType("VMRegImpl");
+    AddressField stack0Field = type.getAddressField("stack0");
+    stack0Addr = stack0Field.getValue();
+    stack0Val = (int) stack0Addr.hashCode();
+    stack0 = new VMReg(stack0Val);
+    regNameField = type.getAddressField("regName[0]");
+  }
+
+  public static VMReg getStack0() {
+    return stack0;
+  }
+
+  public static String getRegisterName(int index) {
+    if (Assert.ASSERTS_ENABLED) {
+      Assert.that(index >= 0 && index < stack0Val, "invalid index : " + index);
+    }
+    Address regName = regNameField.getStaticFieldAddress();
+    long addrSize = VM.getVM().getAddressSize();
+    return CStringUtilities.getString(regName.getAddressAt(index * addrSize));
+  }
+}