1 /* 2 * Copyright (c) 1997, 2015, 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 java.io.IOException; 36 import jdk.test.lib.hprof.parser.ReadBuffer; 37 38 /** 39 * @author Bill Foote 40 */ 41 public class JavaObjectArray extends JavaLazyReadObject { 42 43 private Object clazz; // Long before resolve, the class after resolve 44 45 public JavaObjectArray(long classID, long offset) { 46 super(offset); 47 this.clazz = makeId(classID); 48 } 49 50 public JavaClass getClazz() { 51 return (JavaClass) clazz; 52 } 53 54 public void resolve(Snapshot snapshot) { 55 if (clazz instanceof JavaClass) { 56 return; 57 } 58 long classID = getIdValue((Number)clazz); 59 if (snapshot.isNewStyleArrayClass()) { 60 // Modern heap dumps do this 61 JavaThing t = snapshot.findThing(classID); 62 if (t instanceof JavaClass) { 63 clazz = (JavaClass) t; 64 } 65 } 66 if (!(clazz instanceof JavaClass)) { 67 JavaThing t = snapshot.findThing(classID); 68 if (t != null && t instanceof JavaClass) { 69 JavaClass el = (JavaClass) t; 70 String nm = el.getName(); 71 if (!nm.startsWith("[")) { 72 nm = "L" + el.getName() + ";"; 73 } 74 clazz = snapshot.getArrayClass(nm); 75 } 76 } 77 78 if (!(clazz instanceof JavaClass)) { 79 clazz = snapshot.getOtherArrayType(); 80 } 81 ((JavaClass)clazz).addInstance(this); 82 super.resolve(snapshot); 83 } 84 85 public JavaThing[] getValues() { 86 return getElements(); 87 } 88 89 public JavaThing[] getElements() { 90 Snapshot snapshot = getClazz().getSnapshot(); 91 byte[] data = getValue(); 92 final int idSize = snapshot.getIdentifierSize(); 93 final int numElements = data.length / idSize; 94 JavaThing[] elements = new JavaThing[numElements]; 95 int index = 0; 96 for (int i = 0; i < elements.length; i++) { 97 long id = objectIdAt(index, data); 98 index += idSize; 99 elements[i] = snapshot.findThing(id); 100 } 101 return elements; 102 } 103 104 public int compareTo(JavaThing other) { 105 if (other instanceof JavaObjectArray) { 106 return 0; 107 } 108 return super.compareTo(other); 109 } 110 111 public int getLength() { 112 return getValueLength() / getClazz().getIdentifierSize(); 113 } 114 115 public void visitReferencedObjects(JavaHeapObjectVisitor v) { 116 super.visitReferencedObjects(v); 117 JavaThing[] elements = getElements(); 118 for (int i = 0; i < elements.length; i++) { 119 if (elements[i] != null && elements[i] instanceof JavaHeapObject) { 120 v.visit((JavaHeapObject) elements[i]); 121 } 122 } 123 } 124 125 /** 126 * Describe the reference that this thing has to target. This will only 127 * be called if target is in the array returned by getChildrenForRootset. 128 */ 129 public String describeReferenceTo(JavaThing target, Snapshot ss) { 130 JavaThing[] elements = getElements(); 131 for (int i = 0; i < elements.length; i++) { 132 if (elements[i] == target) { 133 return "Element " + i + " of " + this; 134 } 135 } 136 return super.describeReferenceTo(target, ss); 137 } 138 139 /* 140 * Java object array record (HPROF_GC_OBJ_ARRAY_DUMP) 141 * looks as below: 142 * 143 * object ID 144 * stack trace serial number (int) 145 * array length (int) 146 * array class ID 147 * array element IDs 148 */ 149 protected final int readValueLength() throws IOException { 150 JavaClass cl = getClazz(); 151 ReadBuffer buf = cl.getReadBuffer(); 152 int idSize = cl.getIdentifierSize(); 153 long offset = getOffset() + idSize + 4; 154 int len = buf.getInt(offset); 155 return len * cl.getIdentifierSize(); 156 } 157 158 protected final byte[] readValue() throws IOException { 159 JavaClass cl = getClazz(); 160 ReadBuffer buf = cl.getReadBuffer(); 161 int idSize = cl.getIdentifierSize(); 162 long offset = getOffset() + idSize + 4; 163 int len = buf.getInt(offset); 164 if (len == 0) { 165 return Snapshot.EMPTY_BYTE_ARRAY; 166 } else { 167 byte[] res = new byte[len * idSize]; 168 buf.get(offset + 4 + idSize, res); 169 return res; 170 } 171 } 172 }