--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/interpreter/InterpreterCodelet.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2000-2004 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.interpreter;
+
+import java.io.*;
+import java.util.*;
+
+import sun.jvm.hotspot.code.*;
+import sun.jvm.hotspot.debugger.*;
+import sun.jvm.hotspot.runtime.*;
+import sun.jvm.hotspot.types.*;
+import sun.jvm.hotspot.utilities.*;
+
+/** An InterpreterCodelet is a piece of interpreter code. All
+    interpreter code is generated into little codelets which contain
+    extra information for debugging and printing purposes. */
+
+public class InterpreterCodelet extends Stub {
+  private static long          instanceSize;
+  private static CIntegerField sizeField;             // the size in bytes
+  private static AddressField  descriptionField;      // a description of the codelet, for debugging & printing
+  private static CIntegerField bytecodeField;         // associated bytecode if any
+
+  static {
+    VM.registerVMInitializedObserver(new Observer() {
+        public void update(Observable o, Object data) {
+          initialize(VM.getVM().getTypeDataBase());
+        }
+      });
+  }
+
+  private static synchronized void initialize(TypeDataBase db) {
+    Type type = db.lookupType("InterpreterCodelet");
+
+    sizeField            = type.getCIntegerField("_size");
+    descriptionField     = type.getAddressField("_description");
+    bytecodeField        = type.getCIntegerField("_bytecode");
+
+    instanceSize = type.getSize();
+  }
+
+  public InterpreterCodelet(Address addr) {
+    super(addr);
+  }
+
+  public long getSize() {
+    return sizeField.getValue(addr);
+  }
+
+  public Address codeBegin() {
+    return addr.addOffsetTo(instanceSize);
+  }
+
+  public Address codeEnd() {
+    return addr.addOffsetTo(getSize());
+  }
+
+  public long codeSize() {
+    return codeEnd().minus(codeBegin());
+  }
+
+  public String getDescription() {
+    return CStringUtilities.getString(descriptionField.getValue(addr));
+  }
+
+  public void verify() {
+  }
+
+  public void printOn(PrintStream tty) {
+    String desc = getDescription();
+    if (desc != null) {
+      tty.print(desc);
+    }
+    // FIXME: add printing of bytecode
+    tty.println(" [" + codeBegin() + ", " + codeEnd() + ")  " +
+                codeSize() + " bytes  ");
+    // FIXME: add disassembly
+  }
+}