hotspot/agent/src/share/classes/sun/jvm/hotspot/memory/DictionaryEntry.java

/*
 * Copyright (c) 2003, 2013, 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
 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

package sun.jvm.hotspot.memory;

import java.util.*;
import sun.jvm.hotspot.classfile.ClassLoaderData;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.utilities.*;

public class DictionaryEntry extends sun.jvm.hotspot.utilities.HashtableEntry {
  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("DictionaryEntry");
    pdSetField = type.getAddressField("_pd_set");
    loaderDataField = type.getAddressField("_loader_data");
  }

  // Fields
  private static AddressField pdSetField;
  private static AddressField loaderDataField;

  // Accessors

  public ProtectionDomainEntry pdSet() {
    Address tmp = pdSetField.getValue(addr);
    return (ProtectionDomainEntry) VMObjectFactory.newObject(
                          ProtectionDomainEntry.class, tmp);
  }

  public Oop loader() {
    return loaderData().getClassLoader();
  }

  public ClassLoaderData loaderData() {
    return ClassLoaderData.instantiateWrapperFor(loaderDataField.getValue(addr));
  }

  public Klass klass() {
    return (Klass)Metadata.instantiateWrapperFor(literalValue());
  }

  public DictionaryEntry(Address addr) {
    super(addr);
  }

  public boolean equals(Symbol className, Oop classLoader) {
    InstanceKlass ik = (InstanceKlass) klass();
    Oop loader = loader();
    if (! ik.getName().equals(className)) {
      return false;
    } else {
      return (loader == null)? (classLoader == null) :
                               (loader.equals(classLoader));
    }
  }

  public boolean isValidProtectionDomain(Oop protectionDomain) {
    if (protectionDomain == null) {
      return true;
    } else {
      return containsProtectionDomain(protectionDomain);
    }
  }

  public boolean containsProtectionDomain(Oop protectionDomain) {
    InstanceKlass ik = (InstanceKlass) klass();
    // Currently unimplemented and not used.
    // if (protectionDomain.equals(ik.getJavaMirror().getProtectionDomain())) {
    //   return true; // Succeeds trivially
    // }
    for (ProtectionDomainEntry current = pdSet(); current != null;
                                       current = current.next()) {
      if (protectionDomain.equals(current.protectionDomain())) {
        return true;
      }
    }
    return false;
  }

  /* covariant return type :-(
  public DictionaryEntry next() {
    return (DictionaryEntry) super.next();
  }
  For now, let the caller cast it ..
  */
}