summaryrefslogtreecommitdiffstats
path: root/src/scripttools/debugging/qscriptdebuggeragent.cpp
blob: 551f6c36e3e411a5e7496107830ac7264d1c4164 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtSCriptTools module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qscriptdebuggeragent_p.h"
#include "qscriptdebuggeragent_p_p.h"
#include "qscriptdebuggerbackend_p_p.h"

#include <QtCore/qcoreapplication.h>
#include <QtCore/qset.h>
#include <QtScript/qscriptengine.h>

QT_BEGIN_NAMESPACE

/*!
  \since 4.5
  \class QScriptDebuggerAgent
  \internal

  This class implements a state machine that uses the low-level events
  reported by the QScriptEngineAgent interface to implement debugging-
  specific functionality such as stepping and breakpoints. It is used
  internally by the QScriptDebuggerBackend class.
*/

QScriptDebuggerAgentPrivate::QScriptDebuggerAgentPrivate()
    : state(NoState), stepDepth(0), stepCount(0),
        targetScriptId(-1), targetLineNumber(-1), returnCounter(0),
        nextBreakpointId(1), hitBreakpointId(0),
        nextContextId(0), statementCounter(0)
{
}

QScriptDebuggerAgentPrivate::~QScriptDebuggerAgentPrivate()
{
}

QScriptDebuggerAgentPrivate *QScriptDebuggerAgentPrivate::get(
    QScriptDebuggerAgent *q)
{
    if (!q)
        return 0;
    return q->d_func();
}


/*!
  Constructs a new agent for the given \a engine. The agent will
  report debugging-related events (e.g. step completion) to the given
  \a backend.
*/
QScriptDebuggerAgent::QScriptDebuggerAgent(
    QScriptDebuggerBackendPrivate *backend, QScriptEngine *engine)
    : QScriptEngineAgent(engine), d_ptr(new QScriptDebuggerAgentPrivate())
{
    Q_D(QScriptDebuggerAgent);
    d->backend = backend;

    QScriptContext *ctx = engine->currentContext();
    while (ctx) {
        d->scriptIdStack.append(QList<qint64>());
        d->contextIdStack.append(d->nextContextId);
        ++d->nextContextId;
        ctx = ctx->parentContext();
    }
}

/*!
  Destroys this QScriptDebuggerAgent.
*/
QScriptDebuggerAgent::~QScriptDebuggerAgent()
{
    Q_D(QScriptDebuggerAgent);
    if (d->backend)
        d->backend->agentDestroyed(this);
    delete d;
}

/*!
  Instructs the agent to perform a "step into" operation.  This
  function returns immediately. The agent will report step completion
  at a later time, i.e. when script statements are evaluted.
*/
void QScriptDebuggerAgent::enterStepIntoMode(int count)
{
    Q_D(QScriptDebuggerAgent);
    d->state = QScriptDebuggerAgentPrivate::SteppingIntoState;
    d->stepCount = count;
    d->stepResult = QScriptValue();
}

/*!
  Instructs the agent to perform a "step over" operation.  This
  function returns immediately. The agent will report step completion
  at a later time, i.e. when script statements are evaluted.
*/
void QScriptDebuggerAgent::enterStepOverMode(int count)
{
    Q_D(QScriptDebuggerAgent);
    d->state = QScriptDebuggerAgentPrivate::SteppingOverState;
    if (engine()->isEvaluating())
        d->stepDepth = 0;
    else
        d->stepDepth = -1;
    d->stepCount = count;
    d->stepResult = QScriptValue();
}

/*!
  Instructs the agent to perform a "step out" operation.  This
  function returns immediately. The agent will report step completion
  at a later time, i.e. when script statements are evaluted.
*/
void QScriptDebuggerAgent::enterStepOutMode()
{
    Q_D(QScriptDebuggerAgent);
    d->state = QScriptDebuggerAgentPrivate::SteppingOutState;
    if (engine()->isEvaluating())
        d->stepDepth = 0;
    else
        d->stepDepth = -1;
}

/*!
  Instructs the agent to continue evaluation.
  This function returns immediately.
*/
void QScriptDebuggerAgent::enterContinueMode()
{
    Q_D(QScriptDebuggerAgent);
    d->state = QScriptDebuggerAgentPrivate::NoState;
}

/*!
  Instructs the agent to interrupt evaluation.
  This function returns immediately.
*/
void QScriptDebuggerAgent::enterInterruptMode()
{
    Q_D(QScriptDebuggerAgent);
    d->state = QScriptDebuggerAgentPrivate::InterruptingState;
}

/*!
  Instructs the agent to continue evaluation until the location
  described by \a fileName and \a lineNumber is reached.  This
  function returns immediately.
*/
void QScriptDebuggerAgent::enterRunToLocationMode(const QString &fileName, int lineNumber)
{
    Q_D(QScriptDebuggerAgent);
    d->targetFileName = fileName;
    d->targetLineNumber = lineNumber;
    d->targetScriptId = resolveScript(fileName);
    d->state = QScriptDebuggerAgentPrivate::RunningToLocationState;
}

/*!
  Instructs the agent to continue evaluation until the location
  described by \a scriptId and \a lineNumber is reached.  This
  function returns immediately.
*/
void QScriptDebuggerAgent::enterRunToLocationMode(qint64 scriptId, int lineNumber)
{
    Q_D(QScriptDebuggerAgent);
    d->targetScriptId = scriptId;
    d->targetFileName = QString();
    d->targetLineNumber = lineNumber;
    d->state = QScriptDebuggerAgentPrivate::RunningToLocationState;
}

void QScriptDebuggerAgent::enterReturnByForceMode(int contextIndex, const QScriptValue &value)
{
    Q_D(QScriptDebuggerAgent);
    d->returnCounter = contextIndex + 1;
    d->returnValue = QScriptValue();
    d->state = QScriptDebuggerAgentPrivate::ReturningByForceState;
    // throw an exception; we will catch it when the proper frame is popped
    engine()->currentContext()->throwValue(value);
}

/*!
  Sets a breakpoint defined by the given \a data.
  Returns an integer that uniquely identifies the new breakpoint,
  or -1 if setting the breakpoint failed.
*/
int QScriptDebuggerAgent::setBreakpoint(const QScriptBreakpointData &data)
{
    Q_D(QScriptDebuggerAgent);
    qint64 scriptId = data.scriptId();
    if (scriptId != -1) {
        if (!d->scripts.contains(scriptId)) {
            // that script has been unloaded, so invalidate the ID
            scriptId = -1;
            const_cast<QScriptBreakpointData&>(data).setScriptId(-1);
        } else if (data.fileName().isEmpty()) {
            QString fileName = d->scripts[scriptId].fileName();
            const_cast<QScriptBreakpointData&>(data).setFileName(fileName);
        }
    }

    int id = d->nextBreakpointId;
    ++d->nextBreakpointId;

    if (scriptId != -1) {
        d->resolvedBreakpoints[scriptId].append(id);
    } else {
        QString fileName = data.fileName();
        bool resolved = false;
        QScriptScriptMap::const_iterator it;
        for (it = d->scripts.constBegin(); it != d->scripts.constEnd(); ++it) {
            if (it.value().fileName() == fileName) {
                d->resolvedBreakpoints[it.key()].append(id);
                resolved = true;
                break;
            }
        }
        if (!resolved)
            d->unresolvedBreakpoints[fileName].append(id);
    }

    d->breakpoints.insert(id, data);

    return id;
}

/*!
  Deletes the breakpoint with the given \a id.
  Returns true if the breakpoint was deleted, false if
  no such breakpoint exists.
*/
bool QScriptDebuggerAgent::deleteBreakpoint(int id)
{
    Q_D(QScriptDebuggerAgent);
    if (!d->breakpoints.contains(id))
        return false;
    d->breakpoints.remove(id);
    bool found = false;
    {
        QHash<qint64, QList<int> >::iterator it;
        it = d->resolvedBreakpoints.begin();
        for ( ; !found && (it != d->resolvedBreakpoints.end()); ) {
            QList<int> &lst = it.value();
            Q_ASSERT(!lst.isEmpty());
            for (int i = 0; i < lst.size(); ++i) {
                if (lst.at(i) == id) {
                    lst.removeAt(i);
                    found = true;
                    break;
                }
            }
            if (lst.isEmpty())
                it = d->resolvedBreakpoints.erase(it);
            else
                ++it;
        }
    }
    if (!found) {
        QHash<QString, QList<int> >::iterator it;
        it = d->unresolvedBreakpoints.begin();
        for ( ; !found && (it != d->unresolvedBreakpoints.end()); ) {
            QList<int> &lst = it.value();
            Q_ASSERT(!lst.isEmpty());
            for (int i = 0; i < lst.size(); ++i) {
                if (lst.at(i) == id) {
                    lst.removeAt(i);
                    found = true;
                    break;
                }
            }
            if (lst.isEmpty())
                it = d->unresolvedBreakpoints.erase(it);
            else
                ++it;
        }
    }
    return found;
}

/*!
  Deletes all breakpoints.
*/
void QScriptDebuggerAgent::deleteAllBreakpoints()
{
    Q_D(QScriptDebuggerAgent);
    d->breakpoints.clear();
    d->resolvedBreakpoints.clear();
    d->unresolvedBreakpoints.clear();
}

/*!
  Returns the data associated with the breakpoint with the given \a
  id.
*/
QScriptBreakpointData QScriptDebuggerAgent::breakpointData(int id) const
{
    Q_D(const QScriptDebuggerAgent);
    return d->breakpoints.value(id);
}

/*!
  Sets the data associated with the breakpoint with the given \a
  id.
*/
bool QScriptDebuggerAgent::setBreakpointData(int id,
                                             const QScriptBreakpointData &data)
{
    Q_D(QScriptDebuggerAgent);
    if (!d->breakpoints.contains(id))
        return false;
    d->breakpoints[id] = data;
    return true;
}

/*!
  Returns all breakpoints.
*/
QScriptBreakpointMap QScriptDebuggerAgent::breakpoints() const
{
    Q_D(const QScriptDebuggerAgent);
    return d->breakpoints;
}

/*!
  Returns all scripts.
*/
QScriptScriptMap QScriptDebuggerAgent::scripts() const
{
    Q_D(const QScriptDebuggerAgent);
    return d->scripts;
}

/*!
  Returns the data associated with the script with the given \a id.
*/
QScriptScriptData QScriptDebuggerAgent::scriptData(qint64 id) const
{
    Q_D(const QScriptDebuggerAgent);
    return d->scripts.value(id);
}

/*!
  Checkpoints the current scripts.
*/
void QScriptDebuggerAgent::scriptsCheckpoint()
{
    Q_D(QScriptDebuggerAgent);
    d->previousCheckpointScripts = d->checkpointScripts;
    d->checkpointScripts = d->scripts;
}

/*!
  Returns the difference between the current checkpoint and the
  previous checkpoint. The first item in the pair is a list containing
  the identifiers of the scripts that were added. The second item in
  the pair is a list containing the identifiers of the scripts that
  were removed.
*/
QPair<QList<qint64>, QList<qint64> > QScriptDebuggerAgent::scriptsDelta() const
{
    Q_D(const QScriptDebuggerAgent);
    QSet<qint64> prevSet = d->previousCheckpointScripts.keys().toSet();
    QSet<qint64> currSet = d->checkpointScripts.keys().toSet();
    QSet<qint64> addedScriptIds = currSet - prevSet;
    QSet<qint64> removedScriptIds = prevSet - currSet;
    return qMakePair(addedScriptIds.toList(), removedScriptIds.toList());
}

/*!
  Returns the identifier of the script that has the given \a fileName,
  or -1 if there is no such script.
*/
qint64 QScriptDebuggerAgent::resolveScript(const QString &fileName) const
{
    Q_D(const QScriptDebuggerAgent);
    QScriptScriptMap::const_iterator it;
    for (it = d->scripts.constBegin(); it != d->scripts.constEnd(); ++it) {
        if (it.value().fileName() == fileName)
            return it.key();
    }
    return -1;
}

QList<qint64> QScriptDebuggerAgent::contextIds() const
{
    Q_D(const QScriptDebuggerAgent);
    return d->contextIdStack;
}

QPair<QList<qint64>, QList<qint64> > QScriptDebuggerAgent::contextsCheckpoint()
{
    Q_D(QScriptDebuggerAgent);
    int i = d->checkpointContextIdStack.size() - 1;
    int j = d->contextIdStack.size() - 1;
    for ( ; (i >= 0) && (j >= 0); --i, --j) {
        if (d->checkpointContextIdStack.at(i) != d->contextIdStack.at(j))
            break;
    }
    QList<qint64> removed = d->checkpointContextIdStack.mid(0, i+1);
    QList<qint64> added = d->contextIdStack.mid(0, j+1);
    d->checkpointContextIdStack = d->contextIdStack;
    return qMakePair(removed, added);
}

void QScriptDebuggerAgent::nullifyBackendPointer()
{
    Q_D(QScriptDebuggerAgent);
    d->backend = 0;
}

/*!
  \reimp
*/
void QScriptDebuggerAgent::scriptLoad(qint64 id, const QString &program,
                                      const QString &fileName, int baseLineNumber)
{
    Q_D(QScriptDebuggerAgent);
    QScriptScriptData data = QScriptScriptData(program, fileName, baseLineNumber);
    d->scripts.insert(id, data);

    if ((d->state == QScriptDebuggerAgentPrivate::RunningToLocationState)
        && (d->targetScriptId == -1)
        && ((d->targetFileName == fileName) || d->targetFileName.isEmpty())) {
        d->targetScriptId = id;
    }

    if (!fileName.isEmpty()) {
        QList<int> lst = d->unresolvedBreakpoints.take(fileName);
        if (!lst.isEmpty())
            d->resolvedBreakpoints.insert(id, lst);
    }
}

/*!
  \reimp
*/
void QScriptDebuggerAgent::scriptUnload(qint64 id)
{
    Q_D(QScriptDebuggerAgent);
    QScriptScriptData data = d->scripts.take(id);
    QString fileName = data.fileName();

    if ((d->state == QScriptDebuggerAgentPrivate::RunningToLocationState)
        && (d->targetScriptId == id)) {
        d->targetScriptId = -1;
        d->targetFileName = fileName;
    }

    if (!fileName.isEmpty()) {
        QList<int> lst = d->resolvedBreakpoints.take(id);
        if (!lst.isEmpty())
            d->unresolvedBreakpoints.insert(fileName, lst);
    }
}

/*!
  \reimp
*/
void QScriptDebuggerAgent::contextPush()
{
    Q_D(QScriptDebuggerAgent);
    d->scriptIdStack.append(QList<qint64>());
    d->contextIdStack.prepend(d->nextContextId);
    ++d->nextContextId;
}

/*!
  \reimp
*/
void QScriptDebuggerAgent::contextPop()
{
    Q_D(QScriptDebuggerAgent);
    d->scriptIdStack.removeLast();
    d->contextIdStack.removeFirst();
}

/*!
  \reimp
*/
void QScriptDebuggerAgent::functionEntry(qint64 scriptId)
{
    Q_D(QScriptDebuggerAgent);
    QList<qint64> &ids = d->scriptIdStack.last();
    ids.append(scriptId);
    if ((d->state == QScriptDebuggerAgentPrivate::SteppingOverState)
        || (d->state == QScriptDebuggerAgentPrivate::SteppingOutState)) {
        ++d->stepDepth;
    }
}

/*!
  \reimp
*/
void QScriptDebuggerAgent::functionExit(qint64 scriptId,
                                        const QScriptValue &returnValue)
{
    Q_UNUSED(scriptId);
    Q_D(QScriptDebuggerAgent);
    QList<qint64> &ids = d->scriptIdStack.last();
    ids.removeLast();
    if (d->state == QScriptDebuggerAgentPrivate::SteppingOverState) {
        --d->stepDepth;
    } else if (d->state == QScriptDebuggerAgentPrivate::SteppingOutState) {
        if (--d->stepDepth < 0) {
            d->stepResult = returnValue;
            d->state = QScriptDebuggerAgentPrivate::SteppedOutState;
        }
    } else if (d->state == QScriptDebuggerAgentPrivate::ReturningByForceState) {
        if (--d->returnCounter == 0) {
            d->returnValue = returnValue;
            d->state = QScriptDebuggerAgentPrivate::ReturnedByForceState;
            engine()->clearExceptions();
        }
    }
}

/*!
  \reimp
*/
void QScriptDebuggerAgent::positionChange(qint64 scriptId,
                                          int lineNumber, int columnNumber)
{
    Q_D(QScriptDebuggerAgent);
    if (engine()->processEventsInterval() == -1) {
        // see if it's time to call processEvents()
        if ((++d->statementCounter % 25000) == 0) {
            if (!d->processEventsTimer.isNull()) {
                if (d->processEventsTimer.elapsed() > 30) {
                    QCoreApplication::processEvents();
                    d->processEventsTimer.restart();
                }
            } else {
                d->processEventsTimer.start();
            }
        }
    }

    // check breakpoints
    {
        QList<int> lst = d->resolvedBreakpoints.value(scriptId);
        for (int i = 0; i < lst.size(); ++i) {
            int id = lst.at(i);
            QScriptBreakpointData &data = d->breakpoints[id];
            if (!data.isEnabled())
                continue;
            if (data.lineNumber() != lineNumber)
                continue;
            if (!data.condition().isEmpty()) {
                // ### careful, evaluate() can cause an exception
                // ### disable callbacks in nested evaluate?
                QScriptDebuggerAgentPrivate::State was = d->state;
                d->state = QScriptDebuggerAgentPrivate::NoState;
                QScriptValue ret = engine()->evaluate(
                    data.condition(),
                    QString::fromLatin1("Breakpoint %0 condition checker").arg(id));
                if (!ret.isError())
                    d->state = was;
                if (!ret.toBoolean())
                    continue;
            }
            if (!data.hit())
                continue;
            d->hitBreakpointId = id;
            d->state = QScriptDebuggerAgentPrivate::BreakpointState;
        }
    }

    switch (d->state) {
    case QScriptDebuggerAgentPrivate::NoState:
    case QScriptDebuggerAgentPrivate::SteppingOutState:
    case QScriptDebuggerAgentPrivate::ReturningByForceState:
        // Do nothing
        break;

    case QScriptDebuggerAgentPrivate::SteppingIntoState:
        if (--d->stepCount == 0) {
            d->state = QScriptDebuggerAgentPrivate::NoState;
            if (d->backend)
                d->backend->stepped(scriptId, lineNumber, columnNumber, QScriptValue());
        }
        break;

    case QScriptDebuggerAgentPrivate::SteppingOverState:
        if ((d->stepDepth > 0) || (--d->stepCount != 0))
            break;
        // fallthrough
    case QScriptDebuggerAgentPrivate::SteppedOverState:
        d->state = QScriptDebuggerAgentPrivate::NoState;
        if (d->backend)
            d->backend->stepped(scriptId, lineNumber, columnNumber, d->stepResult);
        break;

    case QScriptDebuggerAgentPrivate::SteppedOutState:
        d->state = QScriptDebuggerAgentPrivate::NoState;
        if (d->backend)
            d->backend->stepped(scriptId, lineNumber, columnNumber, d->stepResult);
        break;

    case QScriptDebuggerAgentPrivate::RunningToLocationState:
        if (((lineNumber == d->targetLineNumber) || (d->targetLineNumber == -1))
            && (scriptId == d->targetScriptId)) {
            d->state = QScriptDebuggerAgentPrivate::NoState;
            if (d->backend)
                d->backend->locationReached(scriptId, lineNumber, columnNumber);
        }
        break;

    case QScriptDebuggerAgentPrivate::InterruptingState:
        d->state = QScriptDebuggerAgentPrivate::NoState;
        if (d->backend)
            d->backend->interrupted(scriptId, lineNumber, columnNumber);
        break;

    case QScriptDebuggerAgentPrivate::BreakpointState:
        d->state = QScriptDebuggerAgentPrivate::NoState;
        if (d->backend)
            d->backend->breakpoint(scriptId, lineNumber, columnNumber, d->hitBreakpointId);
        if (d->breakpoints.value(d->hitBreakpointId).isSingleShot())
            deleteBreakpoint(d->hitBreakpointId);
        break;

    case QScriptDebuggerAgentPrivate::ReturnedByForceState:
        d->state = QScriptDebuggerAgentPrivate::NoState;
        if (d->backend)
            d->backend->forcedReturn(scriptId, lineNumber, columnNumber, d->returnValue);
        break;

    case QScriptDebuggerAgentPrivate::SteppedIntoState:
    case QScriptDebuggerAgentPrivate::ReachedLocationState:
    case QScriptDebuggerAgentPrivate::InterruptedState:
// ### deal with the case when code is evaluated while we're already paused
//        Q_ASSERT(false);
        break;
    }
}

/*!
  \reimp
*/
void QScriptDebuggerAgent::exceptionThrow(qint64 scriptId,
                                          const QScriptValue &exception,
                                          bool hasHandler)
{
    Q_D(QScriptDebuggerAgent);
    if (d->state == QScriptDebuggerAgentPrivate::ReturningByForceState) {
        // we threw this exception ourselves, so ignore it for now
        // (see functionExit()).
        return;
    }
    if (d->backend)
        d->backend->exception(scriptId, exception, hasHandler);
}

/*!
  \reimp
*/
void QScriptDebuggerAgent::exceptionCatch(qint64 scriptId,
                                          const QScriptValue &exception)
{
    Q_UNUSED(scriptId);
    Q_UNUSED(exception);
}

/*!
  \reimp
*/
bool QScriptDebuggerAgent::supportsExtension(Extension extension) const
{
    return (extension == DebuggerInvocationRequest);
}

/*!
  \reimp
*/
QVariant QScriptDebuggerAgent::extension(Extension extension,
                                         const QVariant &argument)
{
    Q_UNUSED(extension);
    Q_D(QScriptDebuggerAgent);
    Q_ASSERT(extension == DebuggerInvocationRequest);
    QVariantList lst = argument.toList();
    qint64 scriptId = lst.at(0).toLongLong();
    int lineNumber = lst.at(1).toInt();
    int columnNumber = lst.at(2).toInt();
    d->state = QScriptDebuggerAgentPrivate::NoState;
    if (d->backend) {
        d->backend->debuggerInvocationRequest(
            scriptId, lineNumber, columnNumber);
    }
    return QVariant();
}

QT_END_NAMESPACE