1 /* 2 * Copyright (c) 2012, 2018, 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 sun.jvm.hotspot.debugger.*; 29 import sun.jvm.hotspot.memory.*; 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 java.util.Observer() { 37 public void update(java.util.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.getAddressField("_class_loader"); 46 nextField = type.getAddressField("_next"); 47 klassesField = new MetadataField(type.getAddressField("_klasses"), 0); 48 isUnsafeAnonymousField = new CIntField(type.getCIntegerField("_is_unsafe_anonymous"), 0); 49 dictionaryField = type.getAddressField("_dictionary"); 50 } 51 52 private static AddressField classLoaderField; 53 private static AddressField nextField; 54 private static MetadataField klassesField; 55 private static CIntField isUnsafeAnonymousField; 56 private static AddressField dictionaryField; 57 58 public ClassLoaderData(Address addr) { 59 super(addr); 60 } 61 62 public Dictionary dictionary() { 63 Address tmp = dictionaryField.getValue(); 64 return (Dictionary) VMObjectFactory.newObject(Dictionary.class, tmp); 65 } 66 67 public static ClassLoaderData instantiateWrapperFor(Address addr) { 68 if (addr == null) { 69 return null; 70 } 71 return new ClassLoaderData(addr); 72 } 73 74 public Oop getClassLoader() { 75 Address handle = classLoaderField.getValue(getAddress()); 76 if (handle != null) { 77 // Load through the handle 78 OopHandle refs = handle.getOopHandleAt(0); 79 return (Instance)VM.getVM().getObjectHeap().newOop(refs); 80 } 81 return null; 82 } 83 84 public boolean getisUnsafeAnonymous() { 85 return isUnsafeAnonymousField.getValue(this) != 0; 86 } 87 88 public ClassLoaderData next() { 89 return instantiateWrapperFor(nextField.getValue(getAddress())); 90 } 91 92 public Klass getKlasses() { return (Klass)klassesField.getValue(this); } 93 94 /** Lookup an already loaded class. If not found null is returned. */ 95 public Klass find(String className) { 96 for (Klass l = getKlasses(); l != null; l = l.getNextLinkKlass()) { 97 if (l.getName().equals(className)) { 98 return l; 99 } 100 } 101 return null; 102 } 103 104 /** Iterate over all klasses - including object, primitive 105 array klasses */ 106 public void classesDo(ClassLoaderDataGraph.ClassVisitor v) { 107 for (Klass l = getKlasses(); l != null; l = l.getNextLinkKlass()) { 108 v.visit(l); 109 } 110 } 111 112 /** Iterate over all klasses in the dictionary, including initiating loader. */ 113 public void allEntriesDo(ClassLoaderDataGraph.ClassAndLoaderVisitor v) { 114 for (Klass l = getKlasses(); l != null; l = l.getNextLinkKlass()) { 115 dictionary().allEntriesDo(v, getClassLoader()); 116 } 117 } 118 }