1 /* 2 * Copyright (c) 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 ClassLoaderDataGraph { 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("ClassLoaderDataGraph"); 45 46 headField = type.getAddressField("_head"); 47 } 48 49 private static AddressField headField; 50 51 public ClassLoaderData getClassLoaderGraphHead() { 52 return ClassLoaderData.instantiateWrapperFor(headField.getValue()); 53 } 54 55 public static interface KlassVisitor { 56 public void visit(Klass k); 57 } 58 59 /** Iterate over all anonymous class loaders and the klasses in those */ 60 public void allAnonymousKlassesDo(final KlassVisitor v) { 61 for (ClassLoaderData cl = getClassLoaderGraphHead(); 62 cl != null; 63 cl = cl.next()) { 64 if (cl.getIsAnonymous() == true) { 65 for (Klass k = cl.getKlasses(); k != null; k = k.getNextLinkKlass()) { 66 v.visit(k); 67 } 68 } 69 } 70 } 71 72 }