--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/memory/SystemDictionary.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,192 @@
+/*
+ * Copyright 2001-2005 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.memory;
+
+import java.util.*;
+import sun.jvm.hotspot.debugger.*;
+import sun.jvm.hotspot.oops.*;
+import sun.jvm.hotspot.runtime.*;
+import sun.jvm.hotspot.types.*;
+
+public class SystemDictionary {
+  private static AddressField dictionaryField;
+  private static AddressField sharedDictionaryField;
+  private static AddressField placeholdersField;
+  private static AddressField loaderConstraintTableField;
+  private static sun.jvm.hotspot.types.OopField javaSystemLoaderField;
+  private static int nofBuckets;
+
+  private static sun.jvm.hotspot.types.OopField objectKlassField;
+  private static sun.jvm.hotspot.types.OopField classLoaderKlassField;
+  private static sun.jvm.hotspot.types.OopField stringKlassField;
+  private static sun.jvm.hotspot.types.OopField systemKlassField;
+  private static sun.jvm.hotspot.types.OopField threadKlassField;
+  private static sun.jvm.hotspot.types.OopField threadGroupKlassField;
+
+  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("SystemDictionary");
+
+    dictionaryField = type.getAddressField("_dictionary");
+    sharedDictionaryField = type.getAddressField("_shared_dictionary");
+    placeholdersField = type.getAddressField("_placeholders");
+    loaderConstraintTableField = type.getAddressField("_loader_constraints");
+    javaSystemLoaderField = type.getOopField("_java_system_loader");
+    nofBuckets = db.lookupIntConstant("SystemDictionary::_nof_buckets").intValue();
+
+    objectKlassField = type.getOopField("_object_klass");
+    classLoaderKlassField = type.getOopField("_classloader_klass");
+    stringKlassField = type.getOopField("_string_klass");
+    systemKlassField = type.getOopField("_system_klass");
+    threadKlassField = type.getOopField("_thread_klass");
+    threadGroupKlassField = type.getOopField("_threadGroup_klass");
+  }
+
+  public Dictionary dictionary() {
+    Address tmp = dictionaryField.getValue();
+    return (Dictionary) VMObjectFactory.newObject(Dictionary.class, tmp);
+  }
+
+  public Dictionary sharedDictionary() {
+    Address tmp = sharedDictionaryField.getValue();
+    return (Dictionary) VMObjectFactory.newObject(Dictionary.class, tmp);
+  }
+
+  public PlaceholderTable placeholders() {
+    Address tmp = placeholdersField.getValue();
+    return (PlaceholderTable) VMObjectFactory.newObject(PlaceholderTable.class, tmp);
+  }
+
+  public LoaderConstraintTable constraints() {
+    Address tmp = placeholdersField.getValue();
+    return (LoaderConstraintTable) VMObjectFactory.newObject(LoaderConstraintTable.class, tmp);
+  }
+
+  // few well known classes -- not all are added here.
+  // add more if needed.
+  public static InstanceKlass getThreadKlass() {
+    return (InstanceKlass) newOop(threadKlassField.getValue());
+  }
+
+  public static InstanceKlass getThreadGroupKlass() {
+    return (InstanceKlass) newOop(threadGroupKlassField.getValue());
+  }
+
+  public static InstanceKlass getObjectKlass() {
+    return (InstanceKlass) newOop(objectKlassField.getValue());
+  }
+
+  public static InstanceKlass getStringKlass() {
+    return (InstanceKlass) newOop(stringKlassField.getValue());
+  }
+
+  public static InstanceKlass getClassLoaderKlass() {
+    return (InstanceKlass) newOop(classLoaderKlassField.getValue());
+  }
+
+  public static InstanceKlass getSystemKlass() {
+    return (InstanceKlass) newOop(systemKlassField.getValue());
+  }
+
+  public InstanceKlass getAbstractOwnableSynchronizerKlass() {
+    return (InstanceKlass) find("java/util/concurrent/locks/AbstractOwnableSynchronizer",
+                                null, null);
+  }
+
+  public static Oop javaSystemLoader() {
+    return newOop(javaSystemLoaderField.getValue());
+  }
+
+  public static int getNumOfBuckets() {
+    return nofBuckets;
+  }
+
+  private static Oop newOop(OopHandle handle) {
+    return VM.getVM().getObjectHeap().newOop(handle);
+  }
+
+  /** Lookup an already loaded class. If not found null is returned. */
+  public Klass find(String className, Oop classLoader, Oop protectionDomain) {
+    Symbol sym = VM.getVM().getSymbolTable().probe(className);
+    if (sym == null) return null;
+    return find(sym, classLoader, protectionDomain);
+  }
+
+  /** Lookup an already loaded class. If not found null is returned. */
+  public Klass find(Symbol className, Oop classLoader, Oop protectionDomain) {
+    Dictionary dict = dictionary();
+    long hash = dict.computeHash(className, classLoader);
+    int index = dict.hashToIndex(hash);
+    return dict.find(index, hash, className, classLoader, protectionDomain);
+  }
+
+  /** Interface for iterating through all classes in dictionary */
+  public static interface ClassVisitor {
+    public void visit(Klass k);
+  }
+
+  /** Interface for iterating through all classes and their class
+      loaders in dictionary */
+  public static interface ClassAndLoaderVisitor {
+    public void visit(Klass k, Oop loader);
+  }
+
+  /** Iterate over all klasses - including object, primitive
+      array klasses */
+  public void allClassesDo(final ClassVisitor v) {
+    ClassVisitor visitor = new ClassVisitor() {
+      public void visit(Klass k) {
+        for (Klass l = k; l != null; l = l.arrayKlassOrNull()) {
+          v.visit(l);
+        }
+      }
+    };
+    classesDo(visitor);
+    VM.getVM().getUniverse().basicTypeClassesDo(visitor);
+  }
+
+  /** Iterate over all klasses in dictionary; just the classes from
+      declaring class loaders */
+  public void classesDo(ClassVisitor v) {
+    dictionary().classesDo(v);
+  }
+
+  /** All classes, and their class loaders */
+  public void classesDo(ClassAndLoaderVisitor v) {
+    dictionary().classesDo(v);
+  }
+
+  /** All array classes of primitive type, and their class loaders */
+  public void primArrayClassesDo(ClassAndLoaderVisitor v) {
+    placeholders().primArrayClassesDo(v);
+  }
+}