--- old/agent/src/share/classes/sun/jvm/hotspot/code/CodeCache.java	2010-05-14 15:55:37.807642077 +0100
+++ new/agent/src/share/classes/sun/jvm/hotspot/code/CodeCache.java	2010-05-14 15:55:37.626304740 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2005 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright (c) 2000, 2005, 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
@@ -16,8 +16,8 @@
  * 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
+ * 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.
  *
  */
@@ -33,6 +33,7 @@
 
 public class CodeCache {
   private static AddressField       heapField;
+  private static AddressField       scavengeRootNMethodsField;
   private static VirtualConstructor virtualConstructor;
 
   private CodeHeap heap;
@@ -49,6 +50,7 @@
     Type type = db.lookupType("CodeCache");
 
     heapField = type.getAddressField("_heap");
+    scavengeRootNMethodsField = type.getAddressField("_scavenge_root_nmethods");
 
     virtualConstructor = new VirtualConstructor(db);
     // Add mappings for all possible CodeBlob subclasses
@@ -67,6 +69,10 @@
     heap = (CodeHeap) VMObjectFactory.newObject(CodeHeap.class, heapField.getValue());
   }
 
+  public NMethod scavengeRootMethods() {
+    return (NMethod) VMObjectFactory.newObject(NMethod.class, scavengeRootNMethodsField.getValue());
+  }
+
   public boolean contains(Address p) {
     return getHeap().contains(p);
   }
@@ -167,7 +173,8 @@
     CodeBlob lastBlob = null;
     while (ptr != null && ptr.lessThan(end)) {
       try {
-        CodeBlob blob = findBlobUnsafe(ptr);
+        // Use findStart to get a pointer inside blob other findBlob asserts
+        CodeBlob blob = findBlobUnsafe(heap.findStart(ptr));
         if (blob != null) {
           visitor.visit(blob);
           if (blob == lastBlob) {