38         public void update(Observable o, Object data) {
  39           initialize(VM.getVM().getTypeDataBase());
  40         }
  41       });
  42   }
  43 
  44   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
  45     Type type = db.lookupType("ClassLoaderDataGraph");
  46 
  47     headField = type.getAddressField("_head");
  48   }
  49 
  50   private static AddressField headField;
  51 
  52   public ClassLoaderData getClassLoaderGraphHead() {
  53     return ClassLoaderData.instantiateWrapperFor(headField.getValue());
  54   }
  55 
  56   /** Lookup an already loaded class in any class loader. */
  57   public Klass find(String className) {
  58     Symbol sym = VM.getVM().getSymbolTable().probe(className);
  59     if (sym == null) return null;
  60     for (ClassLoaderData cld = getClassLoaderGraphHead(); cld != null; cld = cld.next()) {
  61         Klass k = cld.find(sym);
  62         if (k != null) {
  63             return k;
  64         }
  65     }
  66     return null;
  67   }
  68 
  69   /** Interface for iterating through all classes. */
  70   public static interface ClassVisitor {
  71     public void visit(Klass k);
  72   }
  73 
  74   /** Interface for iterating through all classes and their class
  75       loaders in dictionary */
  76   public static interface ClassAndLoaderVisitor {
  77     public void visit(Klass k, Oop loader);
  78   }
  79 
  80   /** Iterate over all klasses - including object, primitive
  81       array klasses */

  38         public void update(Observable o, Object data) {
  39           initialize(VM.getVM().getTypeDataBase());
  40         }
  41       });
  42   }
  43 
  44   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
  45     Type type = db.lookupType("ClassLoaderDataGraph");
  46 
  47     headField = type.getAddressField("_head");
  48   }
  49 
  50   private static AddressField headField;
  51 
  52   public ClassLoaderData getClassLoaderGraphHead() {
  53     return ClassLoaderData.instantiateWrapperFor(headField.getValue());
  54   }
  55 
  56   /** Lookup an already loaded class in any class loader. */
  57   public Klass find(String className) {


  58     for (ClassLoaderData cld = getClassLoaderGraphHead(); cld != null; cld = cld.next()) {
  59         Klass k = cld.find(className);
  60         if (k != null) {
  61             return k;
  62         }
  63     }
  64     return null;
  65   }
  66 
  67   /** Interface for iterating through all classes. */
  68   public static interface ClassVisitor {
  69     public void visit(Klass k);
  70   }
  71 
  72   /** Interface for iterating through all classes and their class
  73       loaders in dictionary */
  74   public static interface ClassAndLoaderVisitor {
  75     public void visit(Klass k, Oop loader);
  76   }
  77 
  78   /** Iterate over all klasses - including object, primitive
  79       array klasses */