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| 1 | +/* | |
| 2 | + * Copyright (c) 1997, 2008, 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 com.sun.tools.hat.internal.model; | |
| 34 | + | |
| 35 | +import java.io.IOException; | |
| 36 | +import com.sun.tools.hat.internal.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 | +} | |