1 /* 2 * Copyright (c) 2000, 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.oops; 26 27 import java.io.*; 28 import java.util.*; 29 import sun.jvm.hotspot.debugger.*; 30 import sun.jvm.hotspot.runtime.*; 31 import sun.jvm.hotspot.types.*; 32 33 // An Instance is an instance of a Java Class 34 35 public class Instance extends Oop { 36 static { 37 VM.registerVMInitializedObserver(new Observer() { 38 public void update(Observable o, Object data) { 39 initialize(VM.getVM().getTypeDataBase()); 40 } 41 }); 42 } 43 private static long typeSize; 44 45 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { 46 Type type = db.lookupType("instanceOopDesc"); 47 typeSize = type.getSize(); 48 } 49 50 Instance(OopHandle handle, ObjectHeap heap) { 51 super(handle, heap); 52 } 53 54 // Returns header size in bytes. 55 public static long getHeaderSize() { 56 if (VM.getVM().isCompressedKlassPointersEnabled()) { 57 return typeSize - VM.getVM().getIntSize(); 58 } else { 59 return typeSize; 60 } 61 } 62 63 public boolean isInstance() { return true; } 64 65 public void iterateFields(OopVisitor visitor, boolean doVMFields) { 66 super.iterateFields(visitor, doVMFields); 67 ((InstanceKlass) getKlass()).iterateNonStaticFields(visitor, this); 68 } 69 70 public void printValueOn(PrintStream tty) { 71 // Special-case strings. 72 // FIXME: would like to do this in more type-safe fashion (need 73 // SystemDictionary analogue) 74 if (getKlass().getName().asString().equals("java/lang/String")) { 75 tty.print("\"" + OopUtilities.stringOopToString(this) + "\""); 76 } else { 77 super.printValueOn(tty); 78 } 79 } 80 }