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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 | } | ||