1 /*
2 * Copyright (c) 1998, 2020, 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 java.util.ArrayList;
29 import java.util.Collection;
30 import java.util.Iterator;
31 import java.util.NoSuchElementException;
32 import java.util.Spliterator;
33 import java.util.Spliterators;
34
35 import com.sun.jdi.Field;
36 import com.sun.jdi.InternalException;
37 import com.sun.jdi.Locatable;
38 import com.sun.jdi.Location;
39 import com.sun.jdi.Method;
40 import com.sun.jdi.ObjectReference;
41 import com.sun.jdi.ReferenceType;
42 import com.sun.jdi.ThreadReference;
43 import com.sun.jdi.VMDisconnectedException;
44 import com.sun.jdi.Value;
45 import com.sun.jdi.VirtualMachine;
46 import com.sun.jdi.event.AccessWatchpointEvent;
47 import com.sun.jdi.event.BreakpointEvent;
48 import com.sun.jdi.event.ClassPrepareEvent;
49 import com.sun.jdi.event.ClassUnloadEvent;
50 import com.sun.jdi.event.Event;
51 import com.sun.jdi.event.EventIterator;
52 import com.sun.jdi.event.EventSet;
53 import com.sun.jdi.event.ExceptionEvent;
54 import com.sun.jdi.event.MethodEntryEvent;
55 import com.sun.jdi.event.MethodExitEvent;
56 import com.sun.jdi.event.ModificationWatchpointEvent;
57 import com.sun.jdi.event.MonitorContendedEnterEvent;
58 import com.sun.jdi.event.MonitorContendedEnteredEvent;
59 import com.sun.jdi.event.MonitorWaitEvent;
60 import com.sun.jdi.event.MonitorWaitedEvent;
61 import com.sun.jdi.event.StepEvent;
62 import com.sun.jdi.event.ThreadDeathEvent;
63 import com.sun.jdi.event.ThreadStartEvent;
64 import com.sun.jdi.event.VMDeathEvent;
65 import com.sun.jdi.event.VMDisconnectEvent;
66 import com.sun.jdi.event.VMStartEvent;
67 import com.sun.jdi.event.WatchpointEvent;
68 import com.sun.jdi.request.EventRequest;
69
70 enum EventDestination {UNKNOWN_EVENT, INTERNAL_EVENT, CLIENT_EVENT};
71
72 /*
73 * An EventSet is normally created by the transport reader thread when
74 * it reads a JDWP Composite command. The constructor doesn't unpack
75 * the events contained in the Composite command and create EventImpls
76 * for them because that process might involve calling back into the back-end
77 * which should not be done by the transport reader thread. Instead,
78 * the raw bytes of the packet are read and stored in the EventSet.
79 * The EventSet is then added to each EventQueue. When an EventSet is
80 * removed from an EventQueue, the EventSetImpl.build() method is called.
81 * This method reads the packet bytes and creates the actual EventImpl objects.
82 * build() also filters out events for our internal handler and puts them in
83 * their own EventSet. This means that the EventImpls that are in the EventSet
84 * that is on the queues are all for client requests.
85 */
86 public class EventSetImpl extends ArrayList<Event> implements EventSet {
87 private static final long serialVersionUID = -4857338819787924570L;
88 private VirtualMachineImpl vm; // we implement Mirror
89 private Packet pkt;
90 private byte suspendPolicy;
91 private EventSetImpl internalEventSet;
92
93 public String toString() {
94 String string = "event set, policy:" + suspendPolicy +
95 ", count:" + this.size() + " = {";
96 boolean first = true;
97 for (Event event : this) {
98 if (!first) {
99 string += ", ";
100 }
101 string += event.toString();
102 first = false;
103 }
104 string += "}";
105 return string;
106 }
107
108 abstract class EventImpl extends MirrorImpl implements Event {
109
110 private final byte eventCmd;
111 private final int requestID;
112 // This is set only for client requests, not internal requests.
113 private final EventRequest request;
114
115 /**
116 * Constructor for events.
117 */
118 protected EventImpl(JDWP.Event.Composite.Events.EventsCommon evt,
119 int requestID) {
120 super(EventSetImpl.this.vm);
121 this.eventCmd = evt.eventKind();
122 this.requestID = requestID;
123 EventRequestManagerImpl ermi = EventSetImpl.this.
124 vm.eventRequestManagerImpl();
125 this.request = ermi.request(eventCmd, requestID);
126 }
127
128 /*
129 * Override superclass back to default equality
130 */
131 public boolean equals(Object obj) {
132 return this == obj;
133 }
134
135 public int hashCode() {
136 return System.identityHashCode(this);
137 }
138
139 /**
140 * Constructor for VM disconnected events.
141 */
142 protected EventImpl(byte eventCmd) {
143 super(EventSetImpl.this.vm);
144 this.eventCmd = eventCmd;
145 this.requestID = 0;
146 this.request = null;
147 }
148
149 public EventRequest request() {
150 return request;
151 }
152
153 int requestID() {
154 return requestID;
155 }
156
157 EventDestination destination() {
158 /*
159 * We need to decide if this event is for
160 * 1. an internal request
161 * 2. a client request that is no longer available, ie
162 * it has been deleted, or disabled and re-enabled
163 * which gives it a new ID.
164 * 3. a current client request that is disabled
165 * 4. a current enabled client request.
166 *
167 * We will filter this set into a set
168 * that contains only 1s for our internal queue
169 * and a set that contains only 4s for our client queue.
170 * If we get an EventSet that contains only 2 and 3
171 * then we have to resume it if it is not SUSPEND_NONE
172 * because no one else will.
173 */
174 if (requestID == 0) {
175 /* An unsolicited event. These have traditionally
176 * been treated as client events.
177 */
178 return EventDestination.CLIENT_EVENT;
179 }
180
181 // Is this an event for a current client request?
182 if (request == null) {
183 // Nope. Is it an event for an internal request?
184 EventRequestManagerImpl ermi = this.vm.getInternalEventRequestManager();
185 if (ermi.request(eventCmd, requestID) != null) {
186 // Yep
187 return EventDestination.INTERNAL_EVENT;
188 }
189 return EventDestination.UNKNOWN_EVENT;
190 }
191
192 // We found a client request
193 if (request.isEnabled()) {
194 return EventDestination.CLIENT_EVENT;
195 }
196 return EventDestination.UNKNOWN_EVENT;
197 }
198
199 abstract String eventName();
200
201 public String toString() {
202 return eventName();
203 }
204
205 }
206
207 abstract class ThreadedEventImpl extends EventImpl {
208 private ThreadReference thread;
209
210 ThreadedEventImpl(JDWP.Event.Composite.Events.EventsCommon evt,
211 int requestID, ThreadReference thread) {
212 super(evt, requestID);
213 this.thread = thread;
214 }
215
216 public ThreadReference thread() {
217 return thread;
218 }
219
220 public String toString() {
221 return eventName() + " in thread " + thread.name();
222 }
223 }
224
225 abstract class LocatableEventImpl extends ThreadedEventImpl
226 implements Locatable {
227 private Location location;
228
229 LocatableEventImpl(JDWP.Event.Composite.Events.EventsCommon evt,
230 int requestID,
231 ThreadReference thread, Location location) {
232 super(evt, requestID, thread);
233 this.location = location;
234 }
235
236 public Location location() {
237 return location;
238 }
239
240 /**
241 * For MethodEntry and MethodExit
242 */
243 public Method method() {
244 return location.method();
245 }
246
247 public String toString() {
248 return eventName() + "@" +
249 ((location() == null) ? " null" : location().toString()) +
250 " in thread " + thread().name();
251 }
252 }
253
254 class BreakpointEventImpl extends LocatableEventImpl
255 implements BreakpointEvent {
256 BreakpointEventImpl(JDWP.Event.Composite.Events.Breakpoint evt) {
257 super(evt, evt.requestID, evt.thread, evt.location);
258 }
259
260 String eventName() {
261 return "BreakpointEvent";
262 }
263 }
264
265 class StepEventImpl extends LocatableEventImpl implements StepEvent {
266 StepEventImpl(JDWP.Event.Composite.Events.SingleStep evt) {
267 super(evt, evt.requestID, evt.thread, evt.location);
268 }
269
270 String eventName() {
271 return "StepEvent";
272 }
273 }
274
275 class MethodEntryEventImpl extends LocatableEventImpl
276 implements MethodEntryEvent {
277 MethodEntryEventImpl(JDWP.Event.Composite.Events.MethodEntry evt) {
278 super(evt, evt.requestID, evt.thread, evt.location);
279 }
280
281 String eventName() {
282 return "MethodEntryEvent";
283 }
284 }
285
286 class MethodExitEventImpl extends LocatableEventImpl
287 implements MethodExitEvent {
288 private Value returnVal = null;
289
290 MethodExitEventImpl(JDWP.Event.Composite.Events.MethodExit evt) {
291 super(evt, evt.requestID, evt.thread, evt.location);
292 }
293
294 MethodExitEventImpl(JDWP.Event.Composite.Events.MethodExitWithReturnValue evt) {
295 super(evt, evt.requestID, evt.thread, evt.location);
296 returnVal = evt.value;
297 }
298
299 String eventName() {
300 return "MethodExitEvent";
301 }
302
303 public Value returnValue() {
304 if (!this.vm.canGetMethodReturnValues()) {
305 throw new UnsupportedOperationException(
306 "target does not support return values in MethodExit events");
307 }
308 return returnVal;
309 }
310
311 }
312
313 class MonitorContendedEnterEventImpl extends LocatableEventImpl
314 implements MonitorContendedEnterEvent {
315 private ObjectReference monitor = null;
316
317 MonitorContendedEnterEventImpl(JDWP.Event.Composite.Events.MonitorContendedEnter evt) {
318 super(evt, evt.requestID, evt.thread, evt.location);
319 this.monitor = evt.object;
320 }
321
322 String eventName() {
323 return "MonitorContendedEnter";
324 }
325
326 public ObjectReference monitor() {
327 return monitor;
328 };
329
330 }
331
332 class MonitorContendedEnteredEventImpl extends LocatableEventImpl
333 implements MonitorContendedEnteredEvent {
334 private ObjectReference monitor = null;
335
336 MonitorContendedEnteredEventImpl(JDWP.Event.Composite.Events.MonitorContendedEntered evt) {
337 super(evt, evt.requestID, evt.thread, evt.location);
338 this.monitor = evt.object;
339 }
340
341 String eventName() {
342 return "MonitorContendedEntered";
343 }
344
345 public ObjectReference monitor() {
346 return monitor;
347 };
348
349 }
350
351 class MonitorWaitEventImpl extends LocatableEventImpl
352 implements MonitorWaitEvent {
353 private ObjectReference monitor = null;
354 private long timeout;
355
356 MonitorWaitEventImpl(JDWP.Event.Composite.Events.MonitorWait evt) {
357 super(evt, evt.requestID, evt.thread, evt.location);
358 this.monitor = evt.object;
359 this.timeout = evt.timeout;
360 }
361
362 String eventName() {
363 return "MonitorWait";
364 }
365
366 public ObjectReference monitor() {
367 return monitor;
368 };
369
370 public long timeout() {
371 return timeout;
372 }
373 }
374
375 class MonitorWaitedEventImpl extends LocatableEventImpl
376 implements MonitorWaitedEvent {
377 private ObjectReference monitor = null;
378 private boolean timed_out;
379
380 MonitorWaitedEventImpl(JDWP.Event.Composite.Events.MonitorWaited evt) {
381 super(evt, evt.requestID, evt.thread, evt.location);
382 this.monitor = evt.object;
383 this.timed_out = evt.timed_out;
384 }
385
386 String eventName() {
387 return "MonitorWaited";
388 }
389
390 public ObjectReference monitor() {
391 return monitor;
392 };
393
394 public boolean timedout() {
395 return timed_out;
396 }
397 }
398
399 class ClassPrepareEventImpl extends ThreadedEventImpl
400 implements ClassPrepareEvent {
401 private ReferenceType referenceType;
402
403 ClassPrepareEventImpl(JDWP.Event.Composite.Events.ClassPrepare evt) {
404 super(evt, evt.requestID, evt.thread);
405 referenceType = this.vm.referenceType(evt.typeID, evt.refTypeTag,
406 evt.signature);
407 ((ReferenceTypeImpl)referenceType).setStatus(evt.status);
408 }
409
410 public ReferenceType referenceType() {
411 return referenceType;
412 }
413
414 String eventName() {
415 return "ClassPrepareEvent";
416 }
417 }
418
419 class ClassUnloadEventImpl extends EventImpl implements ClassUnloadEvent {
420 private String classSignature;
421
422 ClassUnloadEventImpl(JDWP.Event.Composite.Events.ClassUnload evt) {
423 super(evt, evt.requestID);
424 this.classSignature = evt.signature;
425 }
426
427 public String className() {
428 // trim leading "L" and trailing ";"
429 String name = classSignature.substring(1, classSignature.length() - 1);
430 int index = name.indexOf("."); // check if it is a hidden class
431 if (index < 0) {
432 return name.replace('/', '.');
433 } else {
434 // map the type descriptor from: "L" + N + "." + <suffix> + ";"
435 // to class name: N.replace('/', '.') + "/" + <suffix>
436 return name.substring(0, index).replace('/', '.')
437 + "/" + name.substring(index + 1);
438 }
439 }
440
441 public String classSignature() {
442 return classSignature;
443 }
444
445 String eventName() {
446 return "ClassUnloadEvent";
447 }
448 }
449
450 class ExceptionEventImpl extends LocatableEventImpl
451 implements ExceptionEvent {
452 private ObjectReference exception;
453 private Location catchLocation;
454
455 ExceptionEventImpl(JDWP.Event.Composite.Events.Exception evt) {
456 super(evt, evt.requestID, evt.thread, evt.location);
457 this.exception = evt.exception;
458 this.catchLocation = evt.catchLocation;
459 }
460
461 public ObjectReference exception() {
462 return exception;
463 }
464
465 public Location catchLocation() {
466 return catchLocation;
467 }
468
469 String eventName() {
470 return "ExceptionEvent";
471 }
472 }
473
474 class ThreadDeathEventImpl extends ThreadedEventImpl
475 implements ThreadDeathEvent {
476 ThreadDeathEventImpl(JDWP.Event.Composite.Events.ThreadDeath evt) {
477 super(evt, evt.requestID, evt.thread);
478 }
479
480 String eventName() {
481 return "ThreadDeathEvent";
482 }
483 }
484
485 class ThreadStartEventImpl extends ThreadedEventImpl
486 implements ThreadStartEvent {
487 ThreadStartEventImpl(JDWP.Event.Composite.Events.ThreadStart evt) {
488 super(evt, evt.requestID, evt.thread);
489 }
490
491 String eventName() {
492 return "ThreadStartEvent";
493 }
494 }
495
496 class VMStartEventImpl extends ThreadedEventImpl
497 implements VMStartEvent {
498 VMStartEventImpl(JDWP.Event.Composite.Events.VMStart evt) {
499 super(evt, evt.requestID, evt.thread);
500 }
501
502 String eventName() {
503 return "VMStartEvent";
504 }
505 }
506
507 class VMDeathEventImpl extends EventImpl implements VMDeathEvent {
508
509 VMDeathEventImpl(JDWP.Event.Composite.Events.VMDeath evt) {
510 super(evt, evt.requestID);
511 }
512
513 String eventName() {
514 return "VMDeathEvent";
515 }
516 }
517
518 class VMDisconnectEventImpl extends EventImpl
519 implements VMDisconnectEvent {
520
521 VMDisconnectEventImpl() {
522 super((byte)JDWP.EventKind.VM_DISCONNECTED);
523 }
524
525 String eventName() {
526 return "VMDisconnectEvent";
527 }
528 }
529
530 abstract class WatchpointEventImpl extends LocatableEventImpl
531 implements WatchpointEvent {
532 private final ReferenceTypeImpl refType;
533 private final long fieldID;
534 private final ObjectReference object;
535 private Field field = null;
536
537 WatchpointEventImpl(JDWP.Event.Composite.Events.EventsCommon evt,
538 int requestID,
539 ThreadReference thread, Location location,
540 byte refTypeTag, long typeID, long fieldID,
541 ObjectReference object) {
542 super(evt, requestID, thread, location);
543 this.refType = this.vm.referenceType(typeID, refTypeTag);
544 this.fieldID = fieldID;
545 this.object = object;
546 }
547
548 public Field field() {
549 if (field == null) {
550 field = refType.getFieldMirror(fieldID);
551 }
552 return field;
553 }
554
555 public ObjectReference object() {
556 return object;
557 }
558
559 public Value valueCurrent() {
560 if (object == null) {
561 return refType.getValue(field());
562 } else {
563 return object.getValue(field());
564 }
565 }
566 }
567
568 class AccessWatchpointEventImpl extends WatchpointEventImpl
569 implements AccessWatchpointEvent {
570
571 AccessWatchpointEventImpl(JDWP.Event.Composite.Events.FieldAccess evt) {
572 super(evt, evt.requestID, evt.thread, evt.location,
573 evt.refTypeTag, evt.typeID, evt.fieldID, evt.object);
574 }
575
576 String eventName() {
577 return "AccessWatchpoint";
578 }
579 }
580
581 class ModificationWatchpointEventImpl extends WatchpointEventImpl
582 implements ModificationWatchpointEvent {
583 Value newValue;
584
585 ModificationWatchpointEventImpl(
586 JDWP.Event.Composite.Events.FieldModification evt) {
587 super(evt, evt.requestID, evt.thread, evt.location,
588 evt.refTypeTag, evt.typeID, evt.fieldID, evt.object);
589 this.newValue = evt.valueToBe;
590 }
591
592 public Value valueToBe() {
593 return newValue;
594 }
595
596 String eventName() {
597 return "ModificationWatchpoint";
598 }
599 }
600
601 /**
602 * Events are constructed on the thread which reads all data from the
603 * transport. This means that the packet cannot be converted to real
604 * JDI objects as that may involve further communications with the
605 * back end which would deadlock.
606 *
607 * Hence the {@link #build()} method below called by EventQueue.
608 */
609 EventSetImpl(VirtualMachine aVm, Packet pkt) {
610 super();
611
612 // From "MirrorImpl":
613 // Yes, its a bit of a hack. But by doing it this
614 // way, this is the only place we have to change
615 // typing to substitute a new impl.
616 vm = (VirtualMachineImpl)aVm;
617
618 this.pkt = pkt;
619 }
620
621 /**
622 * Constructor for special events like VM disconnected
623 */
624 EventSetImpl(VirtualMachine aVm, byte eventCmd) {
625 this(aVm, null);
626 suspendPolicy = JDWP.SuspendPolicy.NONE;
627 switch (eventCmd) {
628 case JDWP.EventKind.VM_DISCONNECTED:
629 addEvent(new VMDisconnectEventImpl());
630 break;
631
632 default:
633 throw new InternalException("Bad singleton event code");
634 }
635 }
636
637 private void addEvent(EventImpl evt) {
638 // Note that this class has a public add method that throws
639 // an exception so that clients can't modify the EventSet
640 super.add(evt);
641 }
642
643 /*
644 * Complete the construction of an EventSet. This is called from
645 * an event handler thread. It upacks the JDWP events inside
646 * the packet and creates EventImpls for them. The EventSet is already
647 * on EventQueues when this is called, so it has to be synch.
648 */
649 synchronized void build() {
650 if (pkt == null) {
651 return;
652 }
653 PacketStream ps = new PacketStream(vm, pkt);
654 JDWP.Event.Composite compEvt = new JDWP.Event.Composite(vm, ps);
655 suspendPolicy = compEvt.suspendPolicy;
656 if ((vm.traceFlags & VirtualMachine.TRACE_EVENTS) != 0) {
657 switch(suspendPolicy) {
658 case JDWP.SuspendPolicy.ALL:
659 vm.printTrace("EventSet: SUSPEND_ALL");
660 break;
661
662 case JDWP.SuspendPolicy.EVENT_THREAD:
663 vm.printTrace("EventSet: SUSPEND_EVENT_THREAD");
664 break;
665
666 case JDWP.SuspendPolicy.NONE:
667 vm.printTrace("EventSet: SUSPEND_NONE");
668 break;
669 }
670 }
671
672 ThreadReference fix6485605 = null;
673 for (int i = 0; i < compEvt.events.length; i++) {
674 EventImpl evt = createEvent(compEvt.events[i]);
675 if ((vm.traceFlags & VirtualMachine.TRACE_EVENTS) != 0) {
676 try {
677 vm.printTrace("Event: " + evt);
678 } catch (VMDisconnectedException ee) {
679 // ignore - see bug 6502716
680 }
681 }
682
683 switch (evt.destination()) {
684 case UNKNOWN_EVENT:
685 // Ignore disabled, deleted, unknown events, but
686 // save the thread if there is one since we might
687 // have to resume it. Note that events for different
688 // threads can't be in the same event set.
689 if (evt instanceof ThreadedEventImpl &&
690 suspendPolicy == JDWP.SuspendPolicy.EVENT_THREAD) {
691 fix6485605 = ((ThreadedEventImpl)evt).thread();
692 }
693 continue;
694 case CLIENT_EVENT:
695 addEvent(evt);
696 break;
697 case INTERNAL_EVENT:
698 if (internalEventSet == null) {
699 internalEventSet = new EventSetImpl(this.vm, null);
700 }
701 internalEventSet.addEvent(evt);
702 break;
703 default:
704 throw new InternalException("Invalid event destination");
705 }
706 }
707 pkt = null; // No longer needed - free it up
708
709 // Avoid hangs described in 6296125, 6293795
710 if (super.size() == 0) {
711 // This set has no client events. If we don't do
712 // needed resumes, no one else is going to.
713 if (suspendPolicy == JDWP.SuspendPolicy.ALL) {
714 vm.resume();
715 } else if (suspendPolicy == JDWP.SuspendPolicy.EVENT_THREAD) {
716 // See bug 6485605.
717 if (fix6485605 != null) {
718 fix6485605.resume();
719 } else {
720 // apparently, there is nothing to resume.
721 }
722 }
723 suspendPolicy = JDWP.SuspendPolicy.NONE;
724
725 }
726
727 }
728
729 /**
730 * Filter out internal events
731 */
732 EventSet userFilter() {
733 return this;
734 }
735
736 /**
737 * Filter out user events.
738 */
739 EventSet internalFilter() {
740 return this.internalEventSet;
741 }
742
743 EventImpl createEvent(JDWP.Event.Composite.Events evt) {
744 JDWP.Event.Composite.Events.EventsCommon comm = evt.aEventsCommon;
745 switch (evt.eventKind) {
746 case JDWP.EventKind.THREAD_START:
747 return new ThreadStartEventImpl(
748 (JDWP.Event.Composite.Events.ThreadStart)comm);
749
750 case JDWP.EventKind.THREAD_END:
751 return new ThreadDeathEventImpl(
752 (JDWP.Event.Composite.Events.ThreadDeath)comm);
753
754 case JDWP.EventKind.EXCEPTION:
755 return new ExceptionEventImpl(
756 (JDWP.Event.Composite.Events.Exception)comm);
757
758 case JDWP.EventKind.BREAKPOINT:
759 return new BreakpointEventImpl(
760 (JDWP.Event.Composite.Events.Breakpoint)comm);
761
762 case JDWP.EventKind.METHOD_ENTRY:
763 return new MethodEntryEventImpl(
764 (JDWP.Event.Composite.Events.MethodEntry)comm);
765
766 case JDWP.EventKind.METHOD_EXIT:
767 return new MethodExitEventImpl(
768 (JDWP.Event.Composite.Events.MethodExit)comm);
769
770 case JDWP.EventKind.METHOD_EXIT_WITH_RETURN_VALUE:
771 return new MethodExitEventImpl(
772 (JDWP.Event.Composite.Events.MethodExitWithReturnValue)comm);
773
774 case JDWP.EventKind.FIELD_ACCESS:
775 return new AccessWatchpointEventImpl(
776 (JDWP.Event.Composite.Events.FieldAccess)comm);
777
778 case JDWP.EventKind.FIELD_MODIFICATION:
779 return new ModificationWatchpointEventImpl(
780 (JDWP.Event.Composite.Events.FieldModification)comm);
781
782 case JDWP.EventKind.SINGLE_STEP:
783 return new StepEventImpl(
784 (JDWP.Event.Composite.Events.SingleStep)comm);
785
786 case JDWP.EventKind.CLASS_PREPARE:
787 return new ClassPrepareEventImpl(
788 (JDWP.Event.Composite.Events.ClassPrepare)comm);
789
790 case JDWP.EventKind.CLASS_UNLOAD:
791 return new ClassUnloadEventImpl(
792 (JDWP.Event.Composite.Events.ClassUnload)comm);
793
794 case JDWP.EventKind.MONITOR_CONTENDED_ENTER:
795 return new MonitorContendedEnterEventImpl(
796 (JDWP.Event.Composite.Events.MonitorContendedEnter)comm);
797
798 case JDWP.EventKind.MONITOR_CONTENDED_ENTERED:
799 return new MonitorContendedEnteredEventImpl(
800 (JDWP.Event.Composite.Events.MonitorContendedEntered)comm);
801
802 case JDWP.EventKind.MONITOR_WAIT:
803 return new MonitorWaitEventImpl(
804 (JDWP.Event.Composite.Events.MonitorWait)comm);
805
806 case JDWP.EventKind.MONITOR_WAITED:
807 return new MonitorWaitedEventImpl(
808 (JDWP.Event.Composite.Events.MonitorWaited)comm);
809
810 case JDWP.EventKind.VM_START:
811 return new VMStartEventImpl(
812 (JDWP.Event.Composite.Events.VMStart)comm);
813
814 case JDWP.EventKind.VM_DEATH:
815 return new VMDeathEventImpl(
816 (JDWP.Event.Composite.Events.VMDeath)comm);
817
818 default:
819 // Ignore unknown event types
820 System.err.println("Ignoring event cmd " +
821 evt.eventKind + " from the VM");
822 return null;
823 }
824 }
825
826 public VirtualMachine virtualMachine() {
827 return vm;
828 }
829
830 public int suspendPolicy() {
831 return EventRequestManagerImpl.JDWPtoJDISuspendPolicy(suspendPolicy);
832 }
833
834 private ThreadReference eventThread() {
835 for (Event event : this) {
836 if (event instanceof ThreadedEventImpl) {
837 return ((ThreadedEventImpl)event).thread();
838 }
839 }
840 return null;
841 }
842
843 public void resume() {
844 switch (suspendPolicy()) {
845 case EventRequest.SUSPEND_ALL:
846 vm.resume();
847 break;
848 case EventRequest.SUSPEND_EVENT_THREAD:
849 ThreadReference thread = eventThread();
850 if (thread == null) {
851 throw new InternalException("Inconsistent suspend policy");
852 }
853 thread.resume();
854 break;
855 case EventRequest.SUSPEND_NONE:
856 // Do nothing
857 break;
858 default:
859 throw new InternalException("Invalid suspend policy");
860 }
861 }
862
863 public Iterator<Event> iterator() {
864 return new Itr();
865 }
866
867 public EventIterator eventIterator() {
868 return new Itr();
869 }
870
871 public class Itr implements EventIterator {
872 /**
873 * Index of element to be returned by subsequent call to next.
874 */
875 int cursor = 0;
876
877 public boolean hasNext() {
878 return cursor != size();
879 }
880
881 public Event next() {
882 try {
883 Event nxt = get(cursor);
884 ++cursor;
885 return nxt;
886 } catch(IndexOutOfBoundsException e) {
887 throw new NoSuchElementException();
888 }
889 }
890
891 public Event nextEvent() {
892 return next();
893 }
894
895 public void remove() {
896 throw new UnsupportedOperationException();
897 }
898 }
899
900 @Override
901 public Spliterator<Event> spliterator() {
902 return Spliterators.spliterator(this, Spliterator.DISTINCT);
903 }
904
905 /* below make this unmodifiable */
906
907 public boolean add(Event o){
908 throw new UnsupportedOperationException();
909 }
910 public boolean remove(Object o) {
911 throw new UnsupportedOperationException();
912 }
913 public boolean addAll(Collection<? extends Event> coll) {
914 throw new UnsupportedOperationException();
915 }
916 public boolean removeAll(Collection<?> coll) {
917 throw new UnsupportedOperationException();
918 }
919 public boolean retainAll(Collection<?> coll) {
920 throw new UnsupportedOperationException();
921 }
922 public void clear() {
923 throw new UnsupportedOperationException();
924 }
925 }