--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/code/ScopeValue.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2000-2001 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.io.*;
+
+import sun.jvm.hotspot.utilities.*;
+
+/** <P> Classes used for serializing debugging information. These
+    abstractions are introducted to provide symmetric read and write
+    operations. </P>
+
+    <P>
+    <UL>
+    <LI> ScopeValue: describes the value of a variable/expression in a scope
+    <UL>
+    <LI> LocationValue: describes a value in a given location (in frame or register)
+    <LI> ConstantValue: describes a constant
+    </UL>
+    </UL>
+    </P> */
+
+public abstract class ScopeValue {
+  // Package private enumeration values (FIXME: read from target VM)
+  static final int LOCATION_CODE        = 0;
+  static final int CONSTANT_INT_CODE    = 1;
+  static final int CONSTANT_OOP_CODE    = 2;
+  static final int CONSTANT_LONG_CODE   = 3;
+  static final int CONSTANT_DOUBLE_CODE = 4;
+
+  public boolean isLocation()       { return false; }
+  public boolean isConstantInt()    { return false; }
+  public boolean isConstantDouble() { return false; }
+  public boolean isConstantLong()   { return false; }
+  public boolean isConstantOop()    { return false; }
+
+  public static ScopeValue readFrom(DebugInfoReadStream stream) {
+    switch (stream.readInt()) {
+    case LOCATION_CODE:
+      return new LocationValue(stream);
+    case CONSTANT_INT_CODE:
+      return new ConstantIntValue(stream);
+    case CONSTANT_OOP_CODE:
+      return new ConstantOopReadValue(stream);
+    case CONSTANT_LONG_CODE:
+      return new ConstantLongValue(stream);
+    case CONSTANT_DOUBLE_CODE:
+      return new ConstantDoubleValue(stream);
+    default:
+      Assert.that(false, "should not reach here");
+      return null;
+    }
+  }
+
+  public abstract void printOn(PrintStream tty);
+}