1 /* 2 * Copyright (c) 2012, 2016, 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.classfile; 26 27 import java.io.PrintStream; 28 import java.util.*; 29 import sun.jvm.hotspot.debugger.*; 30 import sun.jvm.hotspot.runtime.*; 31 import sun.jvm.hotspot.oops.*; 32 import sun.jvm.hotspot.types.*; 33 34 public class ClassLoaderData extends VMObject { 35 static { 36 VM.registerVMInitializedObserver(new Observer() { 37 public void update(Observable o, Object data) { 38 initialize(VM.getVM().getTypeDataBase()); 39 } 40 }); 41 } 42 43 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { 44 Type type = db.lookupType("ClassLoaderData"); 45 classLoaderField = type.getOopField("_class_loader"); 46 nextField = type.getAddressField("_next"); 47 klassesField = type.getAddressField("_klasses"); 48 isAnonymousField = new CIntField(type.getCIntegerField("_is_anonymous"), 0); 49 } 50 51 private static sun.jvm.hotspot.types.OopField classLoaderField; 52 private static AddressField nextField; 53 private static AddressField klassesField; 54 private static CIntField isAnonymousField; 55 56 public ClassLoaderData(Address addr) { 57 super(addr); 58 } 59 60 public static ClassLoaderData instantiateWrapperFor(Address addr) { 61 if (addr == null) { 62 return null; 63 } 64 return new ClassLoaderData(addr); 65 } 66 67 public Oop getClassLoader() { 68 return VM.getVM().getObjectHeap().newOop(classLoaderField.getValue(getAddress())); 69 } 70 71 public boolean getIsAnonymous() { 72 return isAnonymousField.getValue(this) != 0; 73 } 74 75 public ClassLoaderData next() { 76 return instantiateWrapperFor(nextField.getValue(getAddress())); 77 } 78 79 public Klass getKlasses() { 80 return (InstanceKlass)Metadata.instantiateWrapperFor(klassesField.getValue(getAddress())); 81 } 82 }