--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/agent/src/share/classes/sun/jvm/hotspot/types/basic/BasicNarrowOopField.java	Sun Apr 13 17:43:42 2008 -0400
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2008 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.types.basic;
+
+import sun.jvm.hotspot.debugger.*;
+import sun.jvm.hotspot.types.*;
+
+/** A specialization of BasicField which represents a field containing
+    an oop value and which adds typechecked getValue() routines
+    returning OopHandles. */
+
+public class BasicNarrowOopField extends BasicOopField implements NarrowOopField {
+
+  private static final boolean DEBUG = false;
+
+  public BasicNarrowOopField (OopField oopf) {
+    super(oopf);
+  }
+
+  public BasicNarrowOopField(BasicTypeDataBase db, Type containingType, String name, Type type,
+                       boolean isStatic, long offset, Address staticFieldAddress) {
+    super(db, containingType, name, type, isStatic, offset, staticFieldAddress);
+
+    if (DEBUG) {
+      System.out.println(" name " + name + " type " + type + " isStatic " + isStatic + " offset " + offset + " static addr " + staticFieldAddress);
+    }
+    if (!type.isOopType()) {
+      throw new WrongTypeException("Type of a BasicOopField must be an oop type");
+    }
+  }
+
+  /** The field must be nonstatic and the type of the field must be a
+      Java oop, or a WrongTypeException will be thrown. */
+  public OopHandle getValue(Address addr) throws UnmappedAddressException, UnalignedAddressException, WrongTypeException {
+    return getNarrowOopHandle(addr);
+  }
+
+  /** The field must be static and the type of the field must be a
+      Java oop, or a WrongTypeException will be thrown. */
+  public OopHandle getValue() throws UnmappedAddressException, UnalignedAddressException, WrongTypeException {
+    return getNarrowOopHandle();
+  }
+}