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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 | } | ||