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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 | + * Represents Java instance | |
| 40 | + * | |
| 41 | + * @author Bill Foote | |
| 42 | + */ | |
| 43 | +public class JavaObject extends JavaLazyReadObject { | |
| 44 | + | |
| 45 | + private Object clazz; // Number before resolve | |
| 46 | + // JavaClass after resolve | |
| 47 | + /** | |
| 48 | + * Construct a new JavaObject. | |
| 49 | + * | |
| 50 | + * @param classID id of the class object | |
| 51 | + * @param offset The offset of field data | |
| 52 | + */ | |
| 53 | + public JavaObject(long classID, long offset) { | |
| 54 | + super(offset); | |
| 55 | + this.clazz = makeId(classID); | |
| 56 | + } | |
| 57 | + | |
| 58 | + public void resolve(Snapshot snapshot) { | |
| 59 | + if (clazz instanceof JavaClass) { | |
| 60 | + return; | |
| 61 | + } | |
| 62 | + if (clazz instanceof Number) { | |
| 63 | + long classID = getIdValue((Number)clazz); | |
| 64 | + clazz = snapshot.findThing(classID); | |
| 65 | + if (! (clazz instanceof JavaClass)) { | |
| 66 | + warn("Class " + Long.toHexString(classID) + " not found, " + | |
| 67 | + "adding fake class!"); | |
| 68 | + int length; | |
| 69 | + ReadBuffer buf = snapshot.getReadBuffer(); | |
| 70 | + int idSize = snapshot.getIdentifierSize(); | |
| 71 | + long lenOffset = getOffset() + 2*idSize + 4; | |
| 72 | + try { | |
| 73 | + length = buf.getInt(lenOffset); | |
| 74 | + } catch (IOException exp) { | |
| 75 | + throw new RuntimeException(exp); | |
| 76 | + } | |
| 77 | + clazz = snapshot.addFakeInstanceClass(classID, length); | |
| 78 | + } | |
| 79 | + } else { | |
| 80 | + throw new InternalError("should not reach here"); | |
| 81 | + } | |
| 82 | + | |
| 83 | + JavaClass cl = (JavaClass) clazz; | |
| 84 | + cl.resolve(snapshot); | |
| 85 | + | |
| 86 | + // while resolving, parse fields in verbose mode. | |
| 87 | + // but, getFields calls parseFields in non-verbose mode | |
| 88 | + // to avoid printing warnings repeatedly. | |
| 89 | + parseFields(getValue(), true); | |
| 90 | + | |
| 91 | + cl.addInstance(this); | |
| 92 | + super.resolve(snapshot); | |
| 93 | + } | |
| 94 | + | |
| 95 | + /** | |
| 96 | + * Are we the same type as other? We are iff our clazz is the | |
| 97 | + * same type as other's. | |
| 98 | + */ | |
| 99 | + public boolean isSameTypeAs(JavaThing other) { | |
| 100 | + if (!(other instanceof JavaObject)) { | |
| 101 | + return false; | |
| 102 | + } | |
| 103 | + JavaObject oo = (JavaObject) other; | |
| 104 | + return getClazz().equals(oo.getClazz()); | |
| 105 | + } | |
| 106 | + | |
| 107 | + /** | |
| 108 | + * Return our JavaClass object. This may only be called after resolve. | |
| 109 | + */ | |
| 110 | + public JavaClass getClazz() { | |
| 111 | + return (JavaClass) clazz; | |
| 112 | + } | |
| 113 | + | |
| 114 | + public JavaThing[] getFields() { | |
| 115 | + // pass false to verbose mode so that dereference | |
| 116 | + // warnings are not printed. | |
| 117 | + return parseFields(getValue(), false); | |
| 118 | + } | |
| 119 | + | |
| 120 | + // returns the value of field of given name | |
| 121 | + public JavaThing getField(String name) { | |
| 122 | + JavaThing[] flds = getFields(); | |
| 123 | + JavaField[] instFields = getClazz().getFieldsForInstance(); | |
| 124 | + for (int i = 0; i < instFields.length; i++) { | |
| 125 | + if (instFields[i].getName().equals(name)) { | |
| 126 | + return flds[i]; | |
| 127 | + } | |
| 128 | + } | |
| 129 | + return null; | |
| 130 | + } | |
| 131 | + | |
| 132 | + public int compareTo(JavaThing other) { | |
| 133 | + if (other instanceof JavaObject) { | |
| 134 | + JavaObject oo = (JavaObject) other; | |
| 135 | + return getClazz().getName().compareTo(oo.getClazz().getName()); | |
| 136 | + } | |
| 137 | + return super.compareTo(other); | |
| 138 | + } | |
| 139 | + | |
| 140 | + public void visitReferencedObjects(JavaHeapObjectVisitor v) { | |
| 141 | + super.visitReferencedObjects(v); | |
| 142 | + JavaThing[] flds = getFields(); | |
| 143 | + for (int i = 0; i < flds.length; i++) { | |
| 144 | + if (flds[i] != null) { | |
| 145 | + if (v.mightExclude() | |
| 146 | + && v.exclude(getClazz().getClassForField(i), | |
| 147 | + getClazz().getFieldForInstance(i))) | |
| 148 | + { | |
| 149 | + // skip it | |
| 150 | + } else if (flds[i] instanceof JavaHeapObject) { | |
| 151 | + v.visit((JavaHeapObject) flds[i]); | |
| 152 | + } | |
| 153 | + } | |
| 154 | + } | |
| 155 | + } | |
| 156 | + | |
| 157 | + public boolean refersOnlyWeaklyTo(Snapshot ss, JavaThing other) { | |
| 158 | + if (ss.getWeakReferenceClass() != null) { | |
| 159 | + final int referentFieldIndex = ss.getReferentFieldIndex(); | |
| 160 | + if (ss.getWeakReferenceClass().isAssignableFrom(getClazz())) { | |
| 161 | + // | |
| 162 | + // REMIND: This introduces a dependency on the JDK | |
| 163 | + // implementation that is undesirable. | |
| 164 | + JavaThing[] flds = getFields(); | |
| 165 | + for (int i = 0; i < flds.length; i++) { | |
| 166 | + if (i != referentFieldIndex && flds[i] == other) { | |
| 167 | + return false; | |
| 168 | + } | |
| 169 | + } | |
| 170 | + return true; | |
| 171 | + } | |
| 172 | + } | |
| 173 | + return false; | |
| 174 | + } | |
| 175 | + | |
| 176 | + /** | |
| 177 | + * Describe the reference that this thing has to target. This will only | |
| 178 | + * be called if target is in the array returned by getChildrenForRootset. | |
| 179 | + */ | |
| 180 | + public String describeReferenceTo(JavaThing target, Snapshot ss) { | |
| 181 | + JavaThing[] flds = getFields(); | |
| 182 | + for (int i = 0; i < flds.length; i++) { | |
| 183 | + if (flds[i] == target) { | |
| 184 | + JavaField f = getClazz().getFieldForInstance(i); | |
| 185 | + return "field " + f.getName(); | |
| 186 | + } | |
| 187 | + } | |
| 188 | + return super.describeReferenceTo(target, ss); | |
| 189 | + } | |
| 190 | + | |
| 191 | + public String toString() { | |
| 192 | + if (getClazz().isString()) { | |
| 193 | + JavaThing value = getField("value"); | |
| 194 | + if (value instanceof JavaValueArray) { | |
| 195 | + return ((JavaValueArray)value).valueString(); | |
| 196 | + } else { | |
| 197 | + return "null"; | |
| 198 | + } | |
| 199 | + } else { | |
| 200 | + return super.toString(); | |
| 201 | + } | |
| 202 | + } | |
| 203 | + | |
| 204 | + // Internals only below this point | |
| 205 | + | |
| 206 | + /* | |
| 207 | + * Java instance record (HPROF_GC_INSTANCE_DUMP) looks as below: | |
| 208 | + * | |
| 209 | + * object ID | |
| 210 | + * stack trace serial number (int) | |
| 211 | + * class ID | |
| 212 | + * data length (int) | |
| 213 | + * byte[length] | |
| 214 | + */ | |
| 215 | + protected final int readValueLength() throws IOException { | |
| 216 | + JavaClass cl = getClazz(); | |
| 217 | + int idSize = cl.getIdentifierSize(); | |
| 218 | + long lengthOffset = getOffset() + 2*idSize + 4; | |
| 219 | + return cl.getReadBuffer().getInt(lengthOffset); | |
| 220 | + } | |
| 221 | + | |
| 222 | + protected final byte[] readValue() throws IOException { | |
| 223 | + JavaClass cl = getClazz(); | |
| 224 | + int idSize = cl.getIdentifierSize(); | |
| 225 | + ReadBuffer buf = cl.getReadBuffer(); | |
| 226 | + long offset = getOffset() + 2*idSize + 4; | |
| 227 | + int length = buf.getInt(offset); | |
| 228 | + if (length == 0) { | |
| 229 | + return Snapshot.EMPTY_BYTE_ARRAY; | |
| 230 | + } else { | |
| 231 | + byte[] res = new byte[length]; | |
| 232 | + buf.get(offset + 4, res); | |
| 233 | + return res; | |
| 234 | + } | |
| 235 | + } | |
| 236 | + | |
| 237 | + private JavaThing[] parseFields(byte[] data, boolean verbose) { | |
| 238 | + JavaClass cl = getClazz(); | |
| 239 | + int target = cl.getNumFieldsForInstance(); | |
| 240 | + JavaField[] fields = cl.getFields(); | |
| 241 | + JavaThing[] fieldValues = new JavaThing[target]; | |
| 242 | + Snapshot snapshot = cl.getSnapshot(); | |
| 243 | + int idSize = snapshot.getIdentifierSize(); | |
| 244 | + int fieldNo = 0; | |
| 245 | + // In the dump file, the fields are stored in this order: | |
| 246 | + // fields of most derived class (immediate class) are stored | |
| 247 | + // first and then the super class and so on. In this object, | |
| 248 | + // fields are stored in the reverse ("natural") order. i.e., | |
| 249 | + // fields of most super class are stored first. | |
| 250 | + | |
| 251 | + // target variable is used to compensate for the fact that | |
| 252 | + // the dump file starts field values from the leaf working | |
| 253 | + // upwards in the inheritance hierarchy, whereas JavaObject | |
| 254 | + // starts with the top of the inheritance hierarchy and works down. | |
| 255 | + target -= fields.length; | |
| 256 | + JavaClass currClass = cl; | |
| 257 | + int index = 0; | |
| 258 | + for (int i = 0; i < fieldValues.length; i++, fieldNo++) { | |
| 259 | + while (fieldNo >= fields.length) { | |
| 260 | + currClass = currClass.getSuperclass(); | |
| 261 | + fields = currClass.getFields(); | |
| 262 | + fieldNo = 0; | |
| 263 | + target -= fields.length; | |
| 264 | + } | |
| 265 | + JavaField f = fields[fieldNo]; | |
| 266 | + char sig = f.getSignature().charAt(0); | |
| 267 | + switch (sig) { | |
| 268 | + case 'L': | |
| 269 | + case '[': { | |
| 270 | + long id = objectIdAt(index, data); | |
| 271 | + index += idSize; | |
| 272 | + JavaObjectRef ref = new JavaObjectRef(id); | |
| 273 | + fieldValues[target+fieldNo] = ref.dereference(snapshot, f, verbose); | |
| 274 | + break; | |
| 275 | + } | |
| 276 | + case 'Z': { | |
| 277 | + byte value = byteAt(index, data); | |
| 278 | + index++; | |
| 279 | + fieldValues[target+fieldNo] = new JavaBoolean(value != 0); | |
| 280 | + break; | |
| 281 | + } | |
| 282 | + case 'B': { | |
| 283 | + byte value = byteAt(index, data); | |
| 284 | + index++; | |
| 285 | + fieldValues[target+fieldNo] = new JavaByte(value); | |
| 286 | + break; | |
| 287 | + } | |
| 288 | + case 'S': { | |
| 289 | + short value = shortAt(index, data); | |
| 290 | + index += 2; | |
| 291 | + fieldValues[target+fieldNo] = new JavaShort(value); | |
| 292 | + break; | |
| 293 | + } | |
| 294 | + case 'C': { | |
| 295 | + char value = charAt(index, data); | |
| 296 | + index += 2; | |
| 297 | + fieldValues[target+fieldNo] = new JavaChar(value); | |
| 298 | + break; | |
| 299 | + } | |
| 300 | + case 'I': { | |
| 301 | + int value = intAt(index, data); | |
| 302 | + index += 4; | |
| 303 | + fieldValues[target+fieldNo] = new JavaInt(value); | |
| 304 | + break; | |
| 305 | + } | |
| 306 | + case 'J': { | |
| 307 | + long value = longAt(index, data); | |
| 308 | + index += 8; | |
| 309 | + fieldValues[target+fieldNo] = new JavaLong(value); | |
| 310 | + break; | |
| 311 | + } | |
| 312 | + case 'F': { | |
| 313 | + float value = floatAt(index, data); | |
| 314 | + index += 4; | |
| 315 | + fieldValues[target+fieldNo] = new JavaFloat(value); | |
| 316 | + break; | |
| 317 | + } | |
| 318 | + case 'D': { | |
| 319 | + double value = doubleAt(index, data); | |
| 320 | + index += 8; | |
| 321 | + fieldValues[target+fieldNo] = new JavaDouble(value); | |
| 322 | + break; | |
| 323 | + } | |
| 324 | + default: | |
| 325 | + throw new RuntimeException("invalid signature: " + sig); | |
| 326 | + } | |
| 327 | + } | |
| 328 | + return fieldValues; | |
| 329 | + } | |
| 330 | + | |
| 331 | + private void warn(String msg) { | |
| 332 | + System.out.println("WARNING: " + msg); | |
| 333 | + } | |
| 334 | +} | |