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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.util.Vector; | ||
| 36 | import java.util.Enumeration; | ||
| 37 | import com.sun.tools.hat.internal.util.CompositeEnumeration; | ||
| 38 | import com.sun.tools.hat.internal.parser.ReadBuffer; | ||
| 39 | |||
| 40 | /** | ||
| 41 | * | ||
| 42 | * @author Bill Foote | ||
| 43 | */ | ||
| 44 | |||
| 45 | |||
| 46 | public class JavaClass extends JavaHeapObject { | ||
| 47 | // my id | ||
| 48 | private long id; | ||
| 49 | // my name | ||
| 50 | private String name; | ||
| 51 | |||
| 52 | // These are JavaObjectRef before resolve | ||
| 53 | private JavaThing superclass; | ||
| 54 | private JavaThing loader; | ||
| 55 | private JavaThing signers; | ||
| 56 | private JavaThing protectionDomain; | ||
| 57 | |||
| 58 | // non-static fields | ||
| 59 | private JavaField[] fields; | ||
| 60 | // static fields | ||
| 61 | private JavaStatic[] statics; | ||
| 62 | |||
| 63 | private static final JavaClass[] EMPTY_CLASS_ARRAY = new JavaClass[0]; | ||
| 64 | // my subclasses | ||
| 65 | private JavaClass[] subclasses = EMPTY_CLASS_ARRAY; | ||
| 66 | |||
| 67 | // my instances | ||
| 68 | private Vector<JavaHeapObject> instances = new Vector<JavaHeapObject>(); | ||
| 69 | |||
| 70 | // Who I belong to. Set on resolve. | ||
| 71 | private Snapshot mySnapshot; | ||
| 72 | |||
| 73 | // Size of an instance, including VM overhead | ||
| 74 | private int instanceSize; | ||
| 75 | // Total number of fields including inherited ones | ||
| 76 | private int totalNumFields; | ||
| 77 | |||
| 78 | |||
| 79 | public JavaClass(long id, String name, long superclassId, long loaderId, | ||
| 80 | long signersId, long protDomainId, | ||
| 81 | JavaField[] fields, JavaStatic[] statics, | ||
| 82 | int instanceSize) { | ||
| 83 | this.id = id; | ||
| 84 | this.name = name; | ||
| 85 | this.superclass = new JavaObjectRef(superclassId); | ||
| 86 | this.loader = new JavaObjectRef(loaderId); | ||
| 87 | this.signers = new JavaObjectRef(signersId); | ||
| 88 | this.protectionDomain = new JavaObjectRef(protDomainId); | ||
| 89 | this.fields = fields; | ||
| 90 | this.statics = statics; | ||
| 91 | this.instanceSize = instanceSize; | ||
| 92 | } | ||
| 93 | |||
| 94 | public JavaClass(String name, long superclassId, long loaderId, | ||
| 95 | long signersId, long protDomainId, | ||
| 96 | JavaField[] fields, JavaStatic[] statics, | ||
| 97 | int instanceSize) { | ||
| 98 | this(-1L, name, superclassId, loaderId, signersId, | ||
| 99 | protDomainId, fields, statics, instanceSize); | ||
| 100 | } | ||
| 101 | |||
| 102 | public final JavaClass getClazz() { | ||
| 103 | return mySnapshot.getJavaLangClass(); | ||
| 104 | } | ||
| 105 | |||
| 106 | public final int getIdentifierSize() { | ||
| 107 | return mySnapshot.getIdentifierSize(); | ||
| 108 | } | ||
| 109 | |||
| 110 | public final int getMinimumObjectSize() { | ||
| 111 | return mySnapshot.getMinimumObjectSize(); | ||
| 112 | } | ||
| 113 | |||
| 114 | public void resolve(Snapshot snapshot) { | ||
| 115 | if (mySnapshot != null) { | ||
| 116 | return; | ||
| 117 | } | ||
| 118 | mySnapshot = snapshot; | ||
| 119 | resolveSuperclass(snapshot); | ||
| 120 | if (superclass != null) { | ||
| 121 | ((JavaClass) superclass).addSubclass(this); | ||
| 122 | } | ||
| 123 | |||
| 124 | loader = loader.dereference(snapshot, null); | ||
| 125 | signers = signers.dereference(snapshot, null); | ||
| 126 | protectionDomain = protectionDomain.dereference(snapshot, null); | ||
| 127 | |||
| 128 | for (int i = 0; i < statics.length; i++) { | ||
| 129 | statics[i].resolve(this, snapshot); | ||
| 130 | } | ||
| 131 | snapshot.getJavaLangClass().addInstance(this); | ||
| 132 | super.resolve(snapshot); | ||
| 133 | return; | ||
| 134 | } | ||
| 135 | |||
| 136 | /** | ||
| 137 | * Resolve our superclass. This might be called well before | ||
| 138 | * all instances are available (like when reading deferred | ||
| 139 | * instances in a 1.2 dump file :-) Calling this is sufficient | ||
| 140 | * to be able to explore this class' fields. | ||
| 141 | */ | ||
| 142 | public void resolveSuperclass(Snapshot snapshot) { | ||
| 143 | if (superclass == null) { | ||
| 144 | // We must be java.lang.Object, so we have no superclass. | ||
| 145 | } else { | ||
| 146 | totalNumFields = fields.length; | ||
| 147 | superclass = superclass.dereference(snapshot, null); | ||
| 148 | if (superclass == snapshot.getNullThing()) { | ||
| 149 | superclass = null; | ||
| 150 | } else { | ||
| 151 | try { | ||
| 152 | JavaClass sc = (JavaClass) superclass; | ||
| 153 | sc.resolveSuperclass(snapshot); | ||
| 154 | totalNumFields += sc.totalNumFields; | ||
| 155 | } catch (ClassCastException ex) { | ||
| 156 | System.out.println("Warning! Superclass of " + name + " is " + superclass); | ||
| 157 | superclass = null; | ||
| 158 | } | ||
| 159 | } | ||
| 160 | } | ||
| 161 | } | ||
| 162 | |||
| 163 | public boolean isString() { | ||
| 164 | return mySnapshot.getJavaLangString() == this; | ||
| 165 | } | ||
| 166 | |||
| 167 | public boolean isClassLoader() { | ||
| 168 | return mySnapshot.getJavaLangClassLoader().isAssignableFrom(this); | ||
| 169 | } | ||
| 170 | |||
| 171 | /** | ||
| 172 | * Get a numbered field from this class | ||
| 173 | */ | ||
| 174 | public JavaField getField(int i) { | ||
| 175 | if (i < 0 || i >= fields.length) { | ||
| 176 | throw new Error("No field " + i + " for " + name); | ||
| 177 | } | ||
| 178 | return fields[i]; | ||
| 179 | } | ||
| 180 | |||
| 181 | /** | ||
| 182 | * Get the total number of fields that are part of an instance of | ||
| 183 | * this class. That is, include superclasses. | ||
| 184 | */ | ||
| 185 | public int getNumFieldsForInstance() { | ||
| 186 | return totalNumFields; | ||
| 187 | } | ||
| 188 | |||
| 189 | /** | ||
| 190 | * Get a numbered field from all the fields that are part of instance | ||
| 191 | * of this class. That is, include superclasses. | ||
| 192 | */ | ||
| 193 | public JavaField getFieldForInstance(int i) { | ||
| 194 | if (superclass != null) { | ||
| 195 | JavaClass sc = (JavaClass) superclass; | ||
| 196 | if (i < sc.totalNumFields) { | ||
| 197 | return sc.getFieldForInstance(i); | ||
| 198 | } | ||
| 199 | i -= sc.totalNumFields; | ||
| 200 | } | ||
| 201 | return getField(i); | ||
| 202 | } | ||
| 203 | |||
| 204 | /** | ||
| 205 | * Get the class responsible for field i, where i is a field number that | ||
| 206 | * could be passed into getFieldForInstance. | ||
| 207 | * | ||
| 208 | * @see JavaClass.getFieldForInstance() | ||
| 209 | */ | ||
| 210 | public JavaClass getClassForField(int i) { | ||
| 211 | if (superclass != null) { | ||
| 212 | JavaClass sc = (JavaClass) superclass; | ||
| 213 | if (i < sc.totalNumFields) { | ||
| 214 | return sc.getClassForField(i); | ||
| 215 | } | ||
| 216 | } | ||
| 217 | return this; | ||
| 218 | } | ||
| 219 | |||
| 220 | public long getId() { | ||
| 221 | return id; | ||
| 222 | } | ||
| 223 | |||
| 224 | public String getName() { | ||
| 225 | return name; | ||
| 226 | } | ||
| 227 | |||
| 228 | public boolean isArray() { | ||
| 229 | return name.indexOf('[') != -1; | ||
| 230 | } | ||
| 231 | |||
| 232 | public Enumeration getInstances(boolean includeSubclasses) { | ||
| 233 | if (includeSubclasses) { | ||
| 234 | Enumeration res = instances.elements(); | ||
| 235 | for (int i = 0; i < subclasses.length; i++) { | ||
| 236 | res = new CompositeEnumeration(res, | ||
| 237 | subclasses[i].getInstances(true)); | ||
| 238 | } | ||
| 239 | return res; | ||
| 240 | } else { | ||
| 241 | return instances.elements(); | ||
| 242 | } | ||
| 243 | } | ||
| 244 | |||
| 245 | /** | ||
| 246 | * @return a count of the instances of this class | ||
| 247 | */ | ||
| 248 | public int getInstancesCount(boolean includeSubclasses) { | ||
| 249 | int result = instances.size(); | ||
| 250 | if (includeSubclasses) { | ||
| 251 | for (int i = 0; i < subclasses.length; i++) { | ||
| 252 | result += subclasses[i].getInstancesCount(includeSubclasses); | ||
| 253 | } | ||
| 254 | } | ||
| 255 | return result; | ||
| 256 | } | ||
| 257 | |||
| 258 | public JavaClass[] getSubclasses() { | ||
| 259 | return subclasses; | ||
| 260 | } | ||
| 261 | |||
| 262 | /** | ||
| 263 | * This can only safely be called after resolve() | ||
| 264 | */ | ||
| 265 | public JavaClass getSuperclass() { | ||
| 266 | return (JavaClass) superclass; | ||
| 267 | } | ||
| 268 | |||
| 269 | /** | ||
| 270 | * This can only safely be called after resolve() | ||
| 271 | */ | ||
| 272 | public JavaThing getLoader() { | ||
| 273 | return loader; | ||
| 274 | } | ||
| 275 | |||
| 276 | /** | ||
| 277 | * This can only safely be called after resolve() | ||
| 278 | */ | ||
| 279 | public boolean isBootstrap() { | ||
| 280 | return loader == mySnapshot.getNullThing(); | ||
| 281 | } | ||
| 282 | |||
| 283 | /** | ||
| 284 | * This can only safely be called after resolve() | ||
| 285 | */ | ||
| 286 | public JavaThing getSigners() { | ||
| 287 | return signers; | ||
| 288 | } | ||
| 289 | |||
| 290 | /** | ||
| 291 | * This can only safely be called after resolve() | ||
| 292 | */ | ||
| 293 | public JavaThing getProtectionDomain() { | ||
| 294 | return protectionDomain; | ||
| 295 | } | ||
| 296 | |||
| 297 | public JavaField[] getFields() { | ||
| 298 | return fields; | ||
| 299 | } | ||
| 300 | |||
| 301 | /** | ||
| 302 | * Includes superclass fields | ||
| 303 | */ | ||
| 304 | public JavaField[] getFieldsForInstance() { | ||
| 305 | Vector<JavaField> v = new Vector<JavaField>(); | ||
| 306 | addFields(v); | ||
| 307 | JavaField[] result = new JavaField[v.size()]; | ||
| 308 | for (int i = 0; i < v.size(); i++) { | ||
| 309 | result[i] = v.elementAt(i); | ||
| 310 | } | ||
| 311 | return result; | ||
| 312 | } | ||
| 313 | |||
| 314 | |||
| 315 | public JavaStatic[] getStatics() { | ||
| 316 | return statics; | ||
| 317 | } | ||
| 318 | |||
| 319 | // returns value of static field of given name | ||
| 320 | public JavaThing getStaticField(String name) { | ||
| 321 | for (int i = 0; i < statics.length; i++) { | ||
| 322 | JavaStatic s = statics[i]; | ||
| 323 | if (s.getField().getName().equals(name)) { | ||
| 324 | return s.getValue(); | ||
| 325 | } | ||
| 326 | } | ||
| 327 | return null; | ||
| 328 | } | ||
| 329 | |||
| 330 | public String toString() { | ||
| 331 | return "class " + name; | ||
| 332 | } | ||
| 333 | |||
| 334 | public int compareTo(JavaThing other) { | ||
| 335 | if (other instanceof JavaClass) { | ||
| 336 | return name.compareTo(((JavaClass) other).name); | ||
| 337 | } | ||
| 338 | return super.compareTo(other); | ||
| 339 | } | ||
| 340 | |||
| 341 | |||
| 342 | /** | ||
| 343 | * @return true iff a variable of type this is assignable from an instance | ||
| 344 | * of other | ||
| 345 | */ | ||
| 346 | public boolean isAssignableFrom(JavaClass other) { | ||
| 347 | if (this == other) { | ||
| 348 | return true; | ||
| 349 | } else if (other == null) { | ||
| 350 | return false; | ||
| 351 | } else { | ||
| 352 | return isAssignableFrom((JavaClass) other.superclass); | ||
| 353 | // Trivial tail recursion: I have faith in javac. | ||
| 354 | } | ||
| 355 | } | ||
| 356 | |||
| 357 | /** | ||
| 358 | * Describe the reference that this thing has to target. This will only | ||
| 359 | * be called if target is in the array returned by getChildrenForRootset. | ||
| 360 | */ | ||
| 361 | public String describeReferenceTo(JavaThing target, Snapshot ss) { | ||
| 362 | for (int i = 0; i < statics.length; i++) { | ||
| 363 | JavaField f = statics[i].getField(); | ||
| 364 | if (f.hasId()) { | ||
| 365 | JavaThing other = statics[i].getValue(); | ||
| 366 | if (other == target) { | ||
| 367 | return "static field " + f.getName(); | ||
| 368 | } | ||
| 369 | } | ||
| 370 | } | ||
| 371 | return super.describeReferenceTo(target, ss); | ||
| 372 | } | ||
| 373 | |||
| 374 | /** | ||
| 375 | * @return the size of an instance of this class. Gives 0 for an array | ||
| 376 | * type. | ||
| 377 | */ | ||
| 378 | public int getInstanceSize() { | ||
| 379 | return instanceSize + mySnapshot.getMinimumObjectSize(); | ||
| 380 | } | ||
| 381 | |||
| 382 | |||
| 383 | /** | ||
| 384 | * @return The size of all instances of this class. Correctly handles | ||
| 385 | * arrays. | ||
| 386 | */ | ||
| 387 | public long getTotalInstanceSize() { | ||
| 388 | int count = instances.size(); | ||
| 389 | if (count == 0 || !isArray()) { | ||
| 390 | return count * instanceSize; | ||
| 391 | } | ||
| 392 | |||
| 393 | // array class and non-zero count, we have to | ||
| 394 | // get the size of each instance and sum it | ||
| 395 | long result = 0; | ||
| 396 | for (int i = 0; i < count; i++) { | ||
| 397 | JavaThing t = (JavaThing) instances.elementAt(i); | ||
| 398 | result += t.getSize(); | ||
| 399 | } | ||
| 400 | return result; | ||
| 401 | } | ||
| 402 | |||
| 403 | /** | ||
| 404 | * @return the size of this object | ||
| 405 | */ | ||
| 406 | public int getSize() { | ||
| 407 | JavaClass cl = mySnapshot.getJavaLangClass(); | ||
| 408 | if (cl == null) { | ||
| 409 | return 0; | ||
| 410 | } else { | ||
| 411 | return cl.getInstanceSize(); | ||
| 412 | } | ||
| 413 | } | ||
| 414 | |||
| 415 | public void visitReferencedObjects(JavaHeapObjectVisitor v) { | ||
| 416 | super.visitReferencedObjects(v); | ||
| 417 | JavaHeapObject sc = getSuperclass(); | ||
| 418 | if (sc != null) v.visit(getSuperclass()); | ||
| 419 | |||
| 420 | JavaThing other; | ||
| 421 | other = getLoader(); | ||
| 422 | if (other instanceof JavaHeapObject) { | ||
| 423 | v.visit((JavaHeapObject)other); | ||
| 424 | } | ||
| 425 | other = getSigners(); | ||
| 426 | if (other instanceof JavaHeapObject) { | ||
| 427 | v.visit((JavaHeapObject)other); | ||
| 428 | } | ||
| 429 | other = getProtectionDomain(); | ||
| 430 | if (other instanceof JavaHeapObject) { | ||
| 431 | v.visit((JavaHeapObject)other); | ||
| 432 | } | ||
| 433 | |||
| 434 | for (int i = 0; i < statics.length; i++) { | ||
| 435 | JavaField f = statics[i].getField(); | ||
| 436 | if (!v.exclude(this, f) && f.hasId()) { | ||
| 437 | other = statics[i].getValue(); | ||
| 438 | if (other instanceof JavaHeapObject) { | ||
| 439 | v.visit((JavaHeapObject) other); | ||
| 440 | } | ||
| 441 | } | ||
| 442 | } | ||
| 443 | } | ||
| 444 | |||
| 445 | // package-privates below this point | ||
| 446 | final ReadBuffer getReadBuffer() { | ||
| 447 | return mySnapshot.getReadBuffer(); | ||
| 448 | } | ||
| 449 | |||
| 450 | final void setNew(JavaHeapObject obj, boolean flag) { | ||
| 451 | mySnapshot.setNew(obj, flag); | ||
| 452 | } | ||
| 453 | |||
| 454 | final boolean isNew(JavaHeapObject obj) { | ||
| 455 | return mySnapshot.isNew(obj); | ||
| 456 | } | ||
| 457 | |||
| 458 | final StackTrace getSiteTrace(JavaHeapObject obj) { | ||
| 459 | return mySnapshot.getSiteTrace(obj); | ||
| 460 | } | ||
| 461 | |||
| 462 | final void addReferenceFromRoot(Root root, JavaHeapObject obj) { | ||
| 463 | mySnapshot.addReferenceFromRoot(root, obj); | ||
| 464 | } | ||
| 465 | |||
| 466 | final Root getRoot(JavaHeapObject obj) { | ||
| 467 | return mySnapshot.getRoot(obj); | ||
| 468 | } | ||
| 469 | |||
| 470 | final Snapshot getSnapshot() { | ||
| 471 | return mySnapshot; | ||
| 472 | } | ||
| 473 | |||
| 474 | void addInstance(JavaHeapObject inst) { | ||
| 475 | instances.addElement(inst); | ||
| 476 | } | ||
| 477 | |||
| 478 | // Internals only below this point | ||
| 479 | private void addFields(Vector<JavaField> v) { | ||
| 480 | if (superclass != null) { | ||
| 481 | ((JavaClass) superclass).addFields(v); | ||
| 482 | } | ||
| 483 | for (int i = 0; i < fields.length; i++) { | ||
| 484 | v.addElement(fields[i]); | ||
| 485 | } | ||
| 486 | } | ||
| 487 | |||
| 488 | private void addSubclassInstances(Vector<JavaHeapObject> v) { | ||
| 489 | for (int i = 0; i < subclasses.length; i++) { | ||
| 490 | subclasses[i].addSubclassInstances(v); | ||
| 491 | } | ||
| 492 | for (int i = 0; i < instances.size(); i++) { | ||
| 493 | v.addElement(instances.elementAt(i)); | ||
| 494 | } | ||
| 495 | } | ||
| 496 | |||
| 497 | private void addSubclass(JavaClass sub) { | ||
| 498 | JavaClass newValue[] = new JavaClass[subclasses.length + 1]; | ||
| 499 | System.arraycopy(subclasses, 0, newValue, 0, subclasses.length); | ||
| 500 | newValue[subclasses.length] = sub; | ||
| 501 | subclasses = newValue; | ||
| 502 | } | ||
| 503 | } | ||