1 /* 2 * Copyright (c) 2003, 2012, 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 PlaceholderEntry 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("PlaceholderEntry"); 46 loaderDataField = type.getAddressField("_loader_data"); 47 } 48 49 // Field 50 private static AddressField loaderDataField; 51 52 // Accessor 53 public Oop loader() { 54 return loaderData().getClassLoader(); 55 } 56 57 public ClassLoaderData loaderData() { 58 return ClassLoaderData.instantiateWrapperFor(loaderDataField.getValue(addr)); 59 } 60 61 public PlaceholderEntry(Address addr) { 62 super(addr); 63 } 64 65 public Symbol klass() { 66 return Symbol.create(literalValue()); 67 } 68 69 /* covariant return type :-( 70 public PlaceholderEntry next() { 71 return (PlaceholderEntry) super.next(); 72 } 73 For now, let the caller cast it .. 74 */ 75 }