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| 1 | +/* | |
| 2 | + * Copyright (c) 1998, 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 | +package com.sun.tools.jdi; | |
| 27 | + | |
| 28 | +import com.sun.jdi.*; | |
| 29 | + | |
| 30 | +import java.util.*; | |
| 31 | +import java.util.ArrayList; | |
| 32 | + | |
| 33 | +public class ObjectReferenceImpl extends ValueImpl | |
| 34 | + implements ObjectReference, VMListener { | |
| 35 | + | |
| 36 | + protected long ref; | |
| 37 | + private ReferenceType type = null; | |
| 38 | + private int gcDisableCount = 0; | |
| 39 | + boolean addedListener = false; | |
| 40 | + | |
| 41 | + // This is cached only while the VM is suspended | |
| 42 | + protected static class Cache { | |
| 43 | + JDWP.ObjectReference.MonitorInfo monitorInfo = null; | |
| 44 | + } | |
| 45 | + | |
| 46 | + private static final Cache noInitCache = new Cache(); | |
| 47 | + private static final Cache markerCache = new Cache(); | |
| 48 | + private Cache cache = noInitCache; | |
| 49 | + | |
| 50 | + private void disableCache() { | |
| 51 | + synchronized (vm.state()) { | |
| 52 | + cache = null; | |
| 53 | + } | |
| 54 | + } | |
| 55 | + | |
| 56 | + private void enableCache() { | |
| 57 | + synchronized (vm.state()) { | |
| 58 | + cache = markerCache; | |
| 59 | + } | |
| 60 | + } | |
| 61 | + | |
| 62 | + // Override in subclasses | |
| 63 | + protected Cache newCache() { | |
| 64 | + return new Cache(); | |
| 65 | + } | |
| 66 | + | |
| 67 | + protected Cache getCache() { | |
| 68 | + synchronized (vm.state()) { | |
| 69 | + if (cache == noInitCache) { | |
| 70 | + if (vm.state().isSuspended()) { | |
| 71 | + // Set cache now, otherwise newly created objects are | |
| 72 | + // not cached until resuspend | |
| 73 | + enableCache(); | |
| 74 | + } else { | |
| 75 | + disableCache(); | |
| 76 | + } | |
| 77 | + } | |
| 78 | + if (cache == markerCache) { | |
| 79 | + cache = newCache(); | |
| 80 | + } | |
| 81 | + return cache; | |
| 82 | + } | |
| 83 | + } | |
| 84 | + | |
| 85 | + // Return the ClassTypeImpl upon which to invoke a method. | |
| 86 | + // By default it is our very own referenceType() but subclasses | |
| 87 | + // can override. | |
| 88 | + protected ClassTypeImpl invokableReferenceType(Method method) { | |
| 89 | + return (ClassTypeImpl)referenceType(); | |
| 90 | + } | |
| 91 | + | |
| 92 | + ObjectReferenceImpl(VirtualMachine aVm,long aRef) { | |
| 93 | + super(aVm); | |
| 94 | + | |
| 95 | + ref = aRef; | |
| 96 | + } | |
| 97 | + | |
| 98 | + protected String description() { | |
| 99 | + return "ObjectReference " + uniqueID(); | |
| 100 | + } | |
| 101 | + | |
| 102 | + /* | |
| 103 | + * VMListener implementation | |
| 104 | + */ | |
| 105 | + public boolean vmSuspended(VMAction action) { | |
| 106 | + enableCache(); | |
| 107 | + return true; | |
| 108 | + } | |
| 109 | + | |
| 110 | + public boolean vmNotSuspended(VMAction action) { | |
| 111 | + // make sure that cache and listener management are synchronized | |
| 112 | + synchronized (vm.state()) { | |
| 113 | + if (cache != null && (vm.traceFlags & vm.TRACE_OBJREFS) != 0) { | |
| 114 | + vm.printTrace("Clearing temporary cache for " + description()); | |
| 115 | + } | |
| 116 | + disableCache(); | |
| 117 | + if (addedListener) { | |
| 118 | + /* | |
| 119 | + * If a listener was added (i.e. this is not a | |
| 120 | + * ObjectReference that adds a listener on startup), | |
| 121 | + * remove it here. | |
| 122 | + */ | |
| 123 | + addedListener = false; | |
| 124 | + return false; // false says remove | |
| 125 | + } else { | |
| 126 | + return true; | |
| 127 | + } | |
| 128 | + } | |
| 129 | + } | |
| 130 | + | |
| 131 | + public boolean equals(Object obj) { | |
| 132 | + if ((obj != null) && (obj instanceof ObjectReferenceImpl)) { | |
| 133 | + ObjectReferenceImpl other = (ObjectReferenceImpl)obj; | |
| 134 | + return (ref() == other.ref()) && | |
| 135 | + super.equals(obj); | |
| 136 | + } else { | |
| 137 | + return false; | |
| 138 | + } | |
| 139 | + } | |
| 140 | + | |
| 141 | + public int hashCode() { | |
| 142 | + return(int)ref(); | |
| 143 | + } | |
| 144 | + | |
| 145 | + public Type type() { | |
| 146 | + return referenceType(); | |
| 147 | + } | |
| 148 | + | |
| 149 | + public ReferenceType referenceType() { | |
| 150 | + if (type == null) { | |
| 151 | + try { | |
| 152 | + JDWP.ObjectReference.ReferenceType rtinfo = | |
| 153 | + JDWP.ObjectReference.ReferenceType.process(vm, this); | |
| 154 | + type = vm.referenceType(rtinfo.typeID, | |
| 155 | + rtinfo.refTypeTag); | |
| 156 | + } catch (JDWPException exc) { | |
| 157 | + throw exc.toJDIException(); | |
| 158 | + } | |
| 159 | + } | |
| 160 | + return type; | |
| 161 | + } | |
| 162 | + | |
| 163 | + public Value getValue(Field sig) { | |
| 164 | + List<Field> list = new ArrayList<Field>(1); | |
| 165 | + list.add(sig); | |
| 166 | + Map map = getValues(list); | |
| 167 | + return(Value)map.get(sig); | |
| 168 | + } | |
| 169 | + | |
| 170 | + public Map<Field,Value> getValues(List<? extends Field> theFields) { | |
| 171 | + validateMirrors(theFields); | |
| 172 | + | |
| 173 | + List<Field> staticFields = new ArrayList<Field>(0); | |
| 174 | + int size = theFields.size(); | |
| 175 | + List<Field> instanceFields = new ArrayList<Field>(size); | |
| 176 | + | |
| 177 | + for (int i=0; i<size; i++) { | |
| 178 | + Field field = (Field)theFields.get(i); | |
| 179 | + | |
| 180 | + // Make sure the field is valid | |
| 181 | + ((ReferenceTypeImpl)referenceType()).validateFieldAccess(field); | |
| 182 | + | |
| 183 | + // FIX ME! We need to do some sanity checking | |
| 184 | + // here; make sure the field belongs to this | |
| 185 | + // object. | |
| 186 | + if (field.isStatic()) | |
| 187 | + staticFields.add(field); | |
| 188 | + else { | |
| 189 | + instanceFields.add(field); | |
| 190 | + } | |
| 191 | + } | |
| 192 | + | |
| 193 | + Map<Field, Value> map; | |
| 194 | + if (staticFields.size() > 0) { | |
| 195 | + map = referenceType().getValues(staticFields); | |
| 196 | + } else { | |
| 197 | + map = new HashMap<Field, Value>(size); | |
| 198 | + } | |
| 199 | + | |
| 200 | + size = instanceFields.size(); | |
| 201 | + | |
| 202 | + JDWP.ObjectReference.GetValues.Field[] queryFields = | |
| 203 | + new JDWP.ObjectReference.GetValues.Field[size]; | |
| 204 | + for (int i=0; i<size; i++) { | |
| 205 | + FieldImpl field = (FieldImpl)instanceFields.get(i);/* thanks OTI */ | |
| 206 | + queryFields[i] = new JDWP.ObjectReference.GetValues.Field( | |
| 207 | + field.ref()); | |
| 208 | + } | |
| 209 | + ValueImpl[] values; | |
| 210 | + try { | |
| 211 | + values = JDWP.ObjectReference.GetValues. | |
| 212 | + process(vm, this, queryFields).values; | |
| 213 | + } catch (JDWPException exc) { | |
| 214 | + throw exc.toJDIException(); | |
| 215 | + } | |
| 216 | + | |
| 217 | + if (size != values.length) { | |
| 218 | + throw new InternalException( | |
| 219 | + "Wrong number of values returned from target VM"); | |
| 220 | + } | |
| 221 | + for (int i=0; i<size; i++) { | |
| 222 | + FieldImpl field = (FieldImpl)instanceFields.get(i); | |
| 223 | + map.put(field, values[i]); | |
| 224 | + } | |
| 225 | + | |
| 226 | + return map; | |
| 227 | + } | |
| 228 | + | |
| 229 | + public void setValue(Field field, Value value) | |
| 230 | + throws InvalidTypeException, ClassNotLoadedException { | |
| 231 | + | |
| 232 | + validateMirror(field); | |
| 233 | + validateMirrorOrNull(value); | |
| 234 | + | |
| 235 | + // Make sure the field is valid | |
| 236 | + ((ReferenceTypeImpl)referenceType()).validateFieldSet(field); | |
| 237 | + | |
| 238 | + if (field.isStatic()) { | |
| 239 | + ReferenceType type = referenceType(); | |
| 240 | + if (type instanceof ClassType) { | |
| 241 | + ((ClassType)type).setValue(field, value); | |
| 242 | + return; | |
| 243 | + } else { | |
| 244 | + throw new IllegalArgumentException( | |
| 245 | + "Invalid type for static field set"); | |
| 246 | + } | |
| 247 | + } | |
| 248 | + | |
| 249 | + try { | |
| 250 | + JDWP.ObjectReference.SetValues.FieldValue[] fvals = | |
| 251 | + new JDWP.ObjectReference.SetValues.FieldValue[1]; | |
| 252 | + fvals[0] = new JDWP.ObjectReference.SetValues.FieldValue( | |
| 253 | + ((FieldImpl)field).ref(), | |
| 254 | + // Validate and convert if necessary | |
| 255 | + ValueImpl.prepareForAssignment(value, | |
| 256 | + (FieldImpl)field)); | |
| 257 | + try { | |
| 258 | + JDWP.ObjectReference.SetValues.process(vm, this, fvals); | |
| 259 | + } catch (JDWPException exc) { | |
| 260 | + throw exc.toJDIException(); | |
| 261 | + } | |
| 262 | + } catch (ClassNotLoadedException e) { | |
| 263 | + /* | |
| 264 | + * Since we got this exception, | |
| 265 | + * the field type must be a reference type. The value | |
| 266 | + * we're trying to set is null, but if the field's | |
| 267 | + * class has not yet been loaded through the enclosing | |
| 268 | + * class loader, then setting to null is essentially a | |
| 269 | + * no-op, and we should allow it without an exception. | |
| 270 | + */ | |
| 271 | + if (value != null) { | |
| 272 | + throw e; | |
| 273 | + } | |
| 274 | + } | |
| 275 | + } | |
| 276 | + | |
| 277 | + void validateMethodInvocation(Method method, int options) | |
| 278 | + throws InvalidTypeException, | |
| 279 | + InvocationException { | |
| 280 | + | |
| 281 | + /* | |
| 282 | + * Method must be in this object's class, a superclass, or | |
| 283 | + * implemented interface | |
| 284 | + */ | |
| 285 | + ReferenceTypeImpl declType = (ReferenceTypeImpl)method.declaringType(); | |
| 286 | + if (!declType.isAssignableFrom(this)) { | |
| 287 | + throw new IllegalArgumentException("Invalid method"); | |
| 288 | + } | |
| 289 | + | |
| 290 | + ClassTypeImpl clazz = invokableReferenceType(method); | |
| 291 | + | |
| 292 | + /* | |
| 293 | + * Method must be a non-constructor | |
| 294 | + */ | |
| 295 | + if (method.isConstructor()) { | |
| 296 | + throw new IllegalArgumentException("Cannot invoke constructor"); | |
| 297 | + } | |
| 298 | + | |
| 299 | + /* | |
| 300 | + * For nonvirtual invokes, method must have a body | |
| 301 | + */ | |
| 302 | + if ((options & INVOKE_NONVIRTUAL) != 0) { | |
| 303 | + if (method.declaringType() instanceof InterfaceType) { | |
| 304 | + throw new IllegalArgumentException("Interface method"); | |
| 305 | + } else if (method.isAbstract()) { | |
| 306 | + throw new IllegalArgumentException("Abstract method"); | |
| 307 | + } | |
| 308 | + } | |
| 309 | + | |
| 310 | + /* | |
| 311 | + * Get the class containing the method that will be invoked. | |
| 312 | + * This class is needed only for proper validation of the | |
| 313 | + * method argument types. | |
| 314 | + */ | |
| 315 | + ClassTypeImpl invokedClass; | |
| 316 | + if ((options & INVOKE_NONVIRTUAL) != 0) { | |
| 317 | + // No overrides in non-virtual invokes | |
| 318 | + invokedClass = clazz; | |
| 319 | + } else { | |
| 320 | + /* | |
| 321 | + * For virtual invokes, find any override of the method. | |
| 322 | + * Since we are looking for a method with a real body, we | |
| 323 | + * don't need to bother with interfaces/abstract methods. | |
| 324 | + */ | |
| 325 | + Method invoker = clazz.concreteMethodByName(method.name(), | |
| 326 | + method.signature()); | |
| 327 | + // isAssignableFrom check above guarantees non-null | |
| 328 | + invokedClass = (ClassTypeImpl)invoker.declaringType(); | |
| 329 | + } | |
| 330 | + /* The above code is left over from previous versions. | |
| 331 | + * We haven't had time to divine the intent. jjh, 7/31/2003 | |
| 332 | + */ | |
| 333 | + } | |
| 334 | + | |
| 335 | + PacketStream sendInvokeCommand(final ThreadReferenceImpl thread, | |
| 336 | + final ClassTypeImpl refType, | |
| 337 | + final MethodImpl method, | |
| 338 | + final ValueImpl[] args, | |
| 339 | + final int options) { | |
| 340 | + CommandSender sender = | |
| 341 | + new CommandSender() { | |
| 342 | + public PacketStream send() { | |
| 343 | + return JDWP.ObjectReference.InvokeMethod.enqueueCommand( | |
| 344 | + vm, ObjectReferenceImpl.this, | |
| 345 | + thread, refType, | |
| 346 | + method.ref(), args, options); | |
| 347 | + } | |
| 348 | + }; | |
| 349 | + | |
| 350 | + PacketStream stream; | |
| 351 | + if ((options & INVOKE_SINGLE_THREADED) != 0) { | |
| 352 | + stream = thread.sendResumingCommand(sender); | |
| 353 | + } else { | |
| 354 | + stream = vm.sendResumingCommand(sender); | |
| 355 | + } | |
| 356 | + return stream; | |
| 357 | + } | |
| 358 | + | |
| 359 | + public Value invokeMethod(ThreadReference threadIntf, Method methodIntf, | |
| 360 | + List<? extends Value> origArguments, int options) | |
| 361 | + throws InvalidTypeException, | |
| 362 | + IncompatibleThreadStateException, | |
| 363 | + InvocationException, | |
| 364 | + ClassNotLoadedException { | |
| 365 | + validateMirror(threadIntf); | |
| 366 | + validateMirror(methodIntf); | |
| 367 | + validateMirrorsOrNulls(origArguments); | |
| 368 | + | |
| 369 | + MethodImpl method = (MethodImpl)methodIntf; | |
| 370 | + ThreadReferenceImpl thread = (ThreadReferenceImpl)threadIntf; | |
| 371 | + | |
| 372 | + if (method.isStatic()) { | |
| 373 | + if (referenceType() instanceof ClassType) { | |
| 374 | + ClassType type = (ClassType)referenceType(); | |
| 375 | + return type.invokeMethod(thread, method, origArguments, options); | |
| 376 | + } else { | |
| 377 | + throw new IllegalArgumentException("Invalid type for static method invocation"); | |
| 378 | + } | |
| 379 | + } | |
| 380 | + | |
| 381 | + validateMethodInvocation(method, options); | |
| 382 | + | |
| 383 | + List<Value> arguments = method.validateAndPrepareArgumentsForInvoke( | |
| 384 | + origArguments); | |
| 385 | + | |
| 386 | + ValueImpl[] args = arguments.toArray(new ValueImpl[0]); | |
| 387 | + JDWP.ObjectReference.InvokeMethod ret; | |
| 388 | + try { | |
| 389 | + PacketStream stream = | |
| 390 | + sendInvokeCommand(thread, invokableReferenceType(method), | |
| 391 | + method, args, options); | |
| 392 | + ret = JDWP.ObjectReference.InvokeMethod.waitForReply(vm, stream); | |
| 393 | + } catch (JDWPException exc) { | |
| 394 | + if (exc.errorCode() == JDWP.Error.INVALID_THREAD) { | |
| 395 | + throw new IncompatibleThreadStateException(); | |
| 396 | + } else { | |
| 397 | + throw exc.toJDIException(); | |
| 398 | + } | |
| 399 | + } | |
| 400 | + | |
| 401 | + /* | |
| 402 | + * There is an implict VM-wide suspend at the conclusion | |
| 403 | + * of a normal (non-single-threaded) method invoke | |
| 404 | + */ | |
| 405 | + if ((options & INVOKE_SINGLE_THREADED) == 0) { | |
| 406 | + vm.notifySuspend(); | |
| 407 | + } | |
| 408 | + | |
| 409 | + if (ret.exception != null) { | |
| 410 | + throw new InvocationException(ret.exception); | |
| 411 | + } else { | |
| 412 | + return ret.returnValue; | |
| 413 | + } | |
| 414 | + } | |
| 415 | + | |
| 416 | + /* leave synchronized to keep count accurate */ | |
| 417 | + public synchronized void disableCollection() { | |
| 418 | + if (gcDisableCount == 0) { | |
| 419 | + try { | |
| 420 | + JDWP.ObjectReference.DisableCollection.process(vm, this); | |
| 421 | + } catch (JDWPException exc) { | |
| 422 | + throw exc.toJDIException(); | |
| 423 | + } | |
| 424 | + } | |
| 425 | + gcDisableCount++; | |
| 426 | + } | |
| 427 | + | |
| 428 | + /* leave synchronized to keep count accurate */ | |
| 429 | + public synchronized void enableCollection() { | |
| 430 | + gcDisableCount--; | |
| 431 | + | |
| 432 | + if (gcDisableCount == 0) { | |
| 433 | + try { | |
| 434 | + JDWP.ObjectReference.EnableCollection.process(vm, this); | |
| 435 | + } catch (JDWPException exc) { | |
| 436 | + // If already collected, no harm done, no exception | |
| 437 | + if (exc.errorCode() != JDWP.Error.INVALID_OBJECT) { | |
| 438 | + throw exc.toJDIException(); | |
| 439 | + } | |
| 440 | + return; | |
| 441 | + } | |
| 442 | + } | |
| 443 | + } | |
| 444 | + | |
| 445 | + public boolean isCollected() { | |
| 446 | + try { | |
| 447 | + return JDWP.ObjectReference.IsCollected.process(vm, this). | |
| 448 | + isCollected; | |
| 449 | + } catch (JDWPException exc) { | |
| 450 | + throw exc.toJDIException(); | |
| 451 | + } | |
| 452 | + } | |
| 453 | + | |
| 454 | + public long uniqueID() { | |
| 455 | + return ref(); | |
| 456 | + } | |
| 457 | + | |
| 458 | + JDWP.ObjectReference.MonitorInfo jdwpMonitorInfo() | |
| 459 | + throws IncompatibleThreadStateException { | |
| 460 | + JDWP.ObjectReference.MonitorInfo info = null; | |
| 461 | + try { | |
| 462 | + Cache local; | |
| 463 | + | |
| 464 | + // getCache() and addlistener() must be synchronized | |
| 465 | + // so that no events are lost. | |
| 466 | + synchronized (vm.state()) { | |
| 467 | + local = getCache(); | |
| 468 | + | |
| 469 | + if (local != null) { | |
| 470 | + info = local.monitorInfo; | |
| 471 | + | |
| 472 | + // Check if there will be something to cache | |
| 473 | + // and there is not already a listener | |
| 474 | + if (info == null && !vm.state().hasListener(this)) { | |
| 475 | + /* For other, less numerous objects, this is done | |
| 476 | + * in the constructor. Since there can be many | |
| 477 | + * ObjectReferences, the VM listener is installed | |
| 478 | + * and removed as needed. | |
| 479 | + * Listener must be installed before process() | |
| 480 | + */ | |
| 481 | + vm.state().addListener(this); | |
| 482 | + addedListener = true; | |
| 483 | + } | |
| 484 | + } | |
| 485 | + } | |
| 486 | + if (info == null) { | |
| 487 | + info = JDWP.ObjectReference.MonitorInfo.process(vm, this); | |
| 488 | + if (local != null) { | |
| 489 | + local.monitorInfo = info; | |
| 490 | + if ((vm.traceFlags & vm.TRACE_OBJREFS) != 0) { | |
| 491 | + vm.printTrace("ObjectReference " + uniqueID() + | |
| 492 | + " temporarily caching monitor info"); | |
| 493 | + } | |
| 494 | + } | |
| 495 | + } | |
| 496 | + } catch (JDWPException exc) { | |
| 497 | + if (exc.errorCode() == JDWP.Error.THREAD_NOT_SUSPENDED) { | |
| 498 | + throw new IncompatibleThreadStateException(); | |
| 499 | + } else { | |
| 500 | + throw exc.toJDIException(); | |
| 501 | + } | |
| 502 | + } | |
| 503 | + return info; | |
| 504 | + } | |
| 505 | + | |
| 506 | + public List<ThreadReference> waitingThreads() throws IncompatibleThreadStateException { | |
| 507 | + return Arrays.asList((ThreadReference[])jdwpMonitorInfo().waiters); | |
| 508 | + } | |
| 509 | + | |
| 510 | + public ThreadReference owningThread() throws IncompatibleThreadStateException { | |
| 511 | + return jdwpMonitorInfo().owner; | |
| 512 | + } | |
| 513 | + | |
| 514 | + public int entryCount() throws IncompatibleThreadStateException { | |
| 515 | + return jdwpMonitorInfo().entryCount; | |
| 516 | + } | |
| 517 | + | |
| 518 | + | |
| 519 | + public List<ObjectReference> referringObjects(long maxReferrers) { | |
| 520 | + if (!vm.canGetInstanceInfo()) { | |
| 521 | + throw new UnsupportedOperationException( | |
| 522 | + "target does not support getting referring objects"); | |
| 523 | + } | |
| 524 | + | |
| 525 | + if (maxReferrers < 0) { | |
| 526 | + throw new IllegalArgumentException("maxReferrers is less than zero: " | |
| 527 | + + maxReferrers); | |
| 528 | + } | |
| 529 | + | |
| 530 | + int intMax = (maxReferrers > Integer.MAX_VALUE)? | |
| 531 | + Integer.MAX_VALUE: (int)maxReferrers; | |
| 532 | + // JDWP can't currently handle more than this (in mustang) | |
| 533 | + | |
| 534 | + try { | |
| 535 | + return Arrays.asList((ObjectReference[])JDWP.ObjectReference.ReferringObjects. | |
| 536 | + process(vm, this, intMax).referringObjects); | |
| 537 | + } catch (JDWPException exc) { | |
| 538 | + throw exc.toJDIException(); | |
| 539 | + } | |
| 540 | + } | |
| 541 | + | |
| 542 | + long ref() { | |
| 543 | + return ref; | |
| 544 | + } | |
| 545 | + | |
| 546 | + boolean isClassObject() { | |
| 547 | + /* | |
| 548 | + * Don't need to worry about subclasses since java.lang.Class is final. | |
| 549 | + */ | |
| 550 | + return referenceType().name().equals("java.lang.Class"); | |
| 551 | + } | |
| 552 | + | |
| 553 | + ValueImpl prepareForAssignmentTo(ValueContainer destination) | |
| 554 | + throws InvalidTypeException, | |
| 555 | + ClassNotLoadedException { | |
| 556 | + | |
| 557 | + validateAssignment(destination); | |
| 558 | + return this; // conversion never necessary | |
| 559 | + } | |
| 560 | + | |
| 561 | + void validateAssignment(ValueContainer destination) | |
| 562 | + throws InvalidTypeException, ClassNotLoadedException { | |
| 563 | + | |
| 564 | + /* | |
| 565 | + * Do these simpler checks before attempting a query of the destination's | |
| 566 | + * type which might cause a confusing ClassNotLoadedException if | |
| 567 | + * the destination is primitive or an array. | |
| 568 | + */ | |
| 569 | + /* | |
| 570 | + * TO DO: Centralize JNI signature knowledge | |
| 571 | + */ | |
| 572 | + if (destination.signature().length() == 1) { | |
| 573 | + throw new InvalidTypeException("Can't assign object value to primitive"); | |
| 574 | + } | |
| 575 | + if ((destination.signature().charAt(0) == '[') && | |
| 576 | + (type().signature().charAt(0) != '[')) { | |
| 577 | + throw new InvalidTypeException("Can't assign non-array value to an array"); | |
| 578 | + } | |
| 579 | + if ("void".equals(destination.typeName())) { | |
| 580 | + throw new InvalidTypeException("Can't assign object value to a void"); | |
| 581 | + } | |
| 582 | + | |
| 583 | + // Validate assignment | |
| 584 | + ReferenceType destType = (ReferenceTypeImpl)destination.type(); | |
| 585 | + ReferenceTypeImpl myType = (ReferenceTypeImpl)referenceType(); | |
| 586 | + if (!myType.isAssignableTo(destType)) { | |
| 587 | + JNITypeParser parser = new JNITypeParser(destType.signature()); | |
| 588 | + String destTypeName = parser.typeName(); | |
| 589 | + throw new InvalidTypeException("Can't assign " + | |
| 590 | + type().name() + | |
| 591 | + " to " + destTypeName); | |
| 592 | + } | |
| 593 | + } | |
| 594 | + | |
| 595 | + | |
| 596 | + public String toString() { | |
| 597 | + return "instance of " + referenceType().name() + "(id=" + uniqueID() + ")"; | |
| 598 | + } | |
| 599 | + | |
| 600 | + byte typeValueKey() { | |
| 601 | + return JDWP.Tag.OBJECT; | |
| 602 | + } | |
| 603 | +} | |