1 /* 2 * Copyright (c) 2003, 2011, 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.debugger.*; 29 import sun.jvm.hotspot.oops.*; 30 import sun.jvm.hotspot.types.*; 31 import sun.jvm.hotspot.runtime.*; 32 import sun.jvm.hotspot.utilities.*; 33 34 public class LoaderConstraintEntry extends sun.jvm.hotspot.utilities.HashtableEntry { 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) { 44 Type type = db.lookupType("LoaderConstraintEntry"); 45 nameField = type.getAddressField("_name"); 46 numLoadersField = type.getCIntegerField("_num_loaders"); 47 maxLoadersField = type.getCIntegerField("_max_loaders"); 48 loadersField = type.getAddressField("_loaders"); 49 } 50 51 // Fields 52 private static AddressField nameField; 53 private static CIntegerField numLoadersField; 54 private static CIntegerField maxLoadersField; 55 private static AddressField loadersField; 56 57 // Accessors 58 59 public Symbol name() { 60 return Symbol.create(nameField.getValue(addr)); 61 } 62 63 public int numLoaders() { 64 return (int) numLoadersField.getValue(addr); 65 } 66 67 public int maxLoaders() { 68 return (int) maxLoadersField.getValue(addr); 69 } 70 71 public Oop initiatingLoader(int i) { 72 if (Assert.ASSERTS_ENABLED) { 73 Assert.that(i >= 0 && i < numLoaders(), "invalid index"); 74 } 75 Address loaders = loadersField.getValue(addr); 76 OopHandle loader = loaders.addOffsetToAsOopHandle(i * VM.getVM().getOopSize()); 77 return VM.getVM().getObjectHeap().newOop(loader); 78 } 79 80 public LoaderConstraintEntry(Address addr) { 81 super(addr); 82 } 83 84 /* covariant return type :-( 85 public LoaderConstraintEntry next() { 86 return (LoaderConstraintEntry) super.next(); 87 } 88 For now, let the caller cast it .. 89 */ 90 }