1 /*
   2  * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.memory;
  26 
  27 import java.util.*;
  28 import sun.jvm.hotspot.classfile.ClassLoaderData;
  29 import sun.jvm.hotspot.debugger.*;
  30 import sun.jvm.hotspot.oops.*;
  31 import sun.jvm.hotspot.types.*;
  32 import sun.jvm.hotspot.runtime.*;
  33 import sun.jvm.hotspot.utilities.*;
  34 
  35 public class DictionaryEntry extends sun.jvm.hotspot.utilities.HashtableEntry {
  36   static {
  37     VM.registerVMInitializedObserver(new Observer() {
  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) {
  45     Type type = db.lookupType("DictionaryEntry");
  46     pdSetField = type.getAddressField("_pd_set");
  47     loaderDataField = type.getAddressField("_loader_data");
  48   }
  49 
  50   // Fields
  51   private static AddressField pdSetField;
  52   private static AddressField loaderDataField;
  53 
  54   // Accessors
  55 
  56   public ProtectionDomainEntry pdSet() {
  57     Address tmp = pdSetField.getValue(addr);
  58     return (ProtectionDomainEntry) VMObjectFactory.newObject(
  59                           ProtectionDomainEntry.class, tmp);
  60   }
  61 
  62   public Oop loader() {
  63     return loaderData().getClassLoader();
  64   }
  65 
  66   public ClassLoaderData loaderData() {
  67     return ClassLoaderData.instantiateWrapperFor(loaderDataField.getValue(addr));
  68   }
  69 
  70   public Klass klass() {
  71     return (Klass)Metadata.instantiateWrapperFor(literalValue());
  72   }
  73 
  74   public DictionaryEntry(Address addr) {
  75     super(addr);
  76   }
  77 
  78   public boolean equals(Symbol className, Oop classLoader) {
  79     InstanceKlass ik = (InstanceKlass) klass();
  80     Oop loader = loader();
  81     if (! ik.getName().equals(className)) {
  82       return false;
  83     } else {
  84       return (loader == null)? (classLoader == null) :
  85                                (loader.equals(classLoader));
  86     }
  87   }
  88 
  89   public boolean isValidProtectionDomain(Oop protectionDomain) {
  90     if (protectionDomain == null) {
  91       return true;
  92     } else {
  93       return containsProtectionDomain(protectionDomain);
  94     }
  95   }
  96 
  97   public boolean containsProtectionDomain(Oop protectionDomain) {
  98     InstanceKlass ik = (InstanceKlass) klass();
  99     // Currently unimplemented and not used.
 100     // if (protectionDomain.equals(ik.getJavaMirror().getProtectionDomain())) {
 101     //   return true; // Succeeds trivially
 102     // }
 103     for (ProtectionDomainEntry current = pdSet(); current != null;
 104                                        current = current.next()) {
 105       if (protectionDomain.equals(current.protectionDomain())) {
 106         return true;
 107       }
 108     }
 109     return false;
 110   }
 111 
 112   /* covariant return type :-(
 113   public DictionaryEntry next() {
 114     return (DictionaryEntry) super.next();
 115   }
 116   For now, let the caller cast it ..
 117   */
 118 }