1 /* 2 * Copyright (c) 1997, 2017, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 27 /* 28 * The Original Code is HAT. The Initial Developer of the 29 * Original Code is Bill Foote, with contributions from others 30 * at JavaSoft/Sun. 31 */ 32 33 package jdk.test.lib.hprof.model; 34 35 import jdk.test.lib.hprof.util.Misc; 36 37 /** 38 * A forward reference to an object. This is an intermediate representation 39 * for a JavaThing, when we have the thing's ID, but we might not have read 40 * the thing yet. 41 * 42 * @author Bill Foote 43 */ 44 public class JavaObjectRef extends JavaThing { 45 private long id; 46 47 public JavaObjectRef(long id) { 48 this.id = id; 49 } 50 51 public long getId() { 52 return id; 53 } 54 55 public boolean isHeapAllocated() { 56 return true; 57 } 58 59 public JavaThing dereference(Snapshot snapshot, JavaField field) { 60 return dereference(snapshot, field, true); 61 } 62 63 public JavaThing dereference(Snapshot snapshot, JavaField field, boolean verbose) { 64 if (field != null && !field.hasId()) { 65 // If this happens, we must be a field that represents an int. 66 // (This only happens with .bod-style files) 67 return new JavaLong(id); 68 } 69 if (id == 0) { 70 return snapshot.getNullThing(); 71 } 72 JavaThing result = snapshot.findThing(id); 73 if (result == null) { 74 if (!snapshot.getUnresolvedObjectsOK() && verbose) { 75 String msg = "WARNING: Failed to resolve object id " 76 + Misc.toHex(id); 77 if (field != null) { 78 msg += " for field " + field.getName() 79 + " (signature " + field.getSignature() + ")"; 80 } 81 System.out.println(msg); 82 // Thread.dumpStack(); 83 } 84 result = new HackJavaValue("Unresolved object " 85 + Misc.toHex(id), 0); 86 } 87 return result; 88 } 89 90 @Override 91 public long getSize() { 92 return 0; 93 } 94 95 public String toString() { 96 return "Unresolved object " + Misc.toHex(id); 97 } 98 }