summaryrefslogtreecommitdiffstats
path: root/src/qml/jsruntime/qv4engine_p.h
blob: d0c58eee8fcf11c22794c484b2eafb3167f7a19b (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
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QV4ENGINE_H
#define QV4ENGINE_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "qv4global_p.h"
#include "qv4managed_p.h"
#include "qv4context_p.h"
#include <private/qintrusivelist_p.h>
#include "qv4enginebase_p.h"
#include <private/qqmlrefcount_p.h>
#include <private/qqmljsengine_p.h>

#ifndef V4_BOOTSTRAP
#  include "qv4function_p.h"
#  include <private/qv8engine_p.h>
#  include <private/qv4compileddata_p.h>
#endif

namespace WTF {
class BumpPointerAllocator;
class PageAllocation;
}

QT_BEGIN_NAMESPACE

class QV8Engine;
class QQmlError;
class QJSEngine;
class QQmlEngine;
class QQmlContextData;

namespace QV4 {
namespace Debugging {
class Debugger;
} // namespace Debugging
namespace Profiling {
class Profiler;
} // namespace Profiling
namespace CompiledData {
struct CompilationUnit;
}

namespace Heap {
struct Module;
};

struct Function;

namespace Promise {
class ReactionHandler;
};

struct Q_QML_EXPORT ExecutionEngine : public EngineBase
{
private:
    static qint32 maxCallDepth;

    friend struct ExecutionContextSaver;
    friend struct ExecutionContext;
    friend struct Heap::ExecutionContext;
public:
    ExecutableAllocator *executableAllocator;
    ExecutableAllocator *regExpAllocator;

    WTF::BumpPointerAllocator *bumperPointerAllocator; // Used by Yarr Regex engine.

    enum {
        JSStackLimit = 4*1024*1024,
        GCStackLimit = 2*1024*1024
    };
    WTF::PageAllocation *jsStack;

    WTF::PageAllocation *gcStack;

    QML_NEARLY_ALWAYS_INLINE Value *jsAlloca(int nValues) {
        Value *ptr = jsStackTop;
        jsStackTop = ptr + nValues;
        return ptr;
    }

    Function *globalCode;

#ifdef V4_BOOTSTRAP
    QJSEngine *jsEngine() const;
    QQmlEngine *qmlEngine() const;
#else // !V4_BOOTSTRAP
    QJSEngine *jsEngine() const { return publicEngine; }
    QQmlEngine *qmlEngine() const { return v8Engine ? v8Engine->engine() : nullptr; }
#endif // V4_BOOTSTRAP
    QV8Engine *v8Engine;
    QJSEngine *publicEngine;

    enum JSObjects {
        RootContext,
        ScriptContext,
        IntegerNull, // Has to come after the RootContext to make the context stack safe
        ObjectProto,
        SymbolProto,
        ArrayProto,
        ArrayProtoValues,
        PropertyListProto,
        StringProto,
        NumberProto,
        BooleanProto,
        DateProto,
        FunctionProto,
        GeneratorProto,
        RegExpProto,
        ErrorProto,
        EvalErrorProto,
        RangeErrorProto,
        ReferenceErrorProto,
        SyntaxErrorProto,
        TypeErrorProto,
        URIErrorProto,
        PromiseProto,
        VariantProto,
#if QT_CONFIG(qml_sequence_object)
        SequenceProto,
#endif
        SharedArrayBufferProto,
        ArrayBufferProto,
        DataViewProto,
        WeakSetProto,
        SetProto,
        WeakMapProto,
        MapProto,
        IntrinsicTypedArrayProto,
        ValueTypeProto,
        SignalHandlerProto,
        IteratorProto,
        ForInIteratorProto,
        SetIteratorProto,
        MapIteratorProto,
        ArrayIteratorProto,
        StringIteratorProto,

        Object_Ctor,
        String_Ctor,
        Symbol_Ctor,
        Number_Ctor,
        Boolean_Ctor,
        Array_Ctor,
        Function_Ctor,
        GeneratorFunction_Ctor,
        Date_Ctor,
        RegExp_Ctor,
        Error_Ctor,
        EvalError_Ctor,
        RangeError_Ctor,
        ReferenceError_Ctor,
        SyntaxError_Ctor,
        TypeError_Ctor,
        URIError_Ctor,
        SharedArrayBuffer_Ctor,
        Promise_Ctor,
        ArrayBuffer_Ctor,
        DataView_Ctor,
        WeakSet_Ctor,
        Set_Ctor,
        WeakMap_Ctor,
        Map_Ctor,
        IntrinsicTypedArray_Ctor,

        GetSymbolSpecies,

        Eval_Function,
        GetStack_Function,
        ThrowerObject,
        NJSObjects
    };
    Value *jsObjects;
    enum { NTypedArrayTypes = 9 }; // == TypedArray::NValues, avoid header dependency

    ExecutionContext *rootContext() const { return reinterpret_cast<ExecutionContext *>(jsObjects + RootContext); }
    ExecutionContext *scriptContext() const { return reinterpret_cast<ExecutionContext *>(jsObjects + ScriptContext); }
    void setScriptContext(ReturnedValue c) { jsObjects[ScriptContext] = c; }
    FunctionObject *objectCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + Object_Ctor); }
    FunctionObject *stringCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + String_Ctor); }
    FunctionObject *symbolCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + Symbol_Ctor); }
    FunctionObject *numberCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + Number_Ctor); }
    FunctionObject *booleanCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + Boolean_Ctor); }
    FunctionObject *arrayCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + Array_Ctor); }
    FunctionObject *functionCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + Function_Ctor); }
    FunctionObject *generatorFunctionCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + GeneratorFunction_Ctor); }
    FunctionObject *dateCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + Date_Ctor); }
    FunctionObject *regExpCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + RegExp_Ctor); }
    FunctionObject *errorCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + Error_Ctor); }
    FunctionObject *evalErrorCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + EvalError_Ctor); }
    FunctionObject *rangeErrorCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + RangeError_Ctor); }
    FunctionObject *referenceErrorCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + ReferenceError_Ctor); }
    FunctionObject *syntaxErrorCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + SyntaxError_Ctor); }
    FunctionObject *typeErrorCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + TypeError_Ctor); }
    FunctionObject *uRIErrorCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + URIError_Ctor); }
    FunctionObject *sharedArrayBufferCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + SharedArrayBuffer_Ctor); }
    FunctionObject *promiseCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + Promise_Ctor); }
    FunctionObject *arrayBufferCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + ArrayBuffer_Ctor); }
    FunctionObject *dataViewCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + DataView_Ctor); }
    FunctionObject *weakSetCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + WeakSet_Ctor); }
    FunctionObject *setCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + Set_Ctor); }
    FunctionObject *weakMapCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + WeakMap_Ctor); }
    FunctionObject *mapCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + Map_Ctor); }
    FunctionObject *intrinsicTypedArrayCtor() const { return reinterpret_cast<FunctionObject *>(jsObjects + IntrinsicTypedArray_Ctor); }
    FunctionObject *typedArrayCtors;

    FunctionObject *getSymbolSpecies() const { return reinterpret_cast<FunctionObject *>(jsObjects + GetSymbolSpecies); }

    Object *objectPrototype() const { return reinterpret_cast<Object *>(jsObjects + ObjectProto); }
    Object *symbolPrototype() const { return reinterpret_cast<Object *>(jsObjects + SymbolProto); }
    Object *arrayPrototype() const { return reinterpret_cast<Object *>(jsObjects + ArrayProto); }
    Object *arrayProtoValues() const { return reinterpret_cast<Object *>(jsObjects + ArrayProtoValues); }
    Object *propertyListPrototype() const { return reinterpret_cast<Object *>(jsObjects + PropertyListProto); }
    Object *stringPrototype() const { return reinterpret_cast<Object *>(jsObjects + StringProto); }
    Object *numberPrototype() const { return reinterpret_cast<Object *>(jsObjects + NumberProto); }
    Object *booleanPrototype() const { return reinterpret_cast<Object *>(jsObjects + BooleanProto); }
    Object *datePrototype() const { return reinterpret_cast<Object *>(jsObjects + DateProto); }
    Object *functionPrototype() const { return reinterpret_cast<Object *>(jsObjects + FunctionProto); }
    Object *generatorPrototype() const { return reinterpret_cast<Object *>(jsObjects + GeneratorProto); }
    Object *regExpPrototype() const { return reinterpret_cast<Object *>(jsObjects + RegExpProto); }
    Object *errorPrototype() const { return reinterpret_cast<Object *>(jsObjects + ErrorProto); }
    Object *evalErrorPrototype() const { return reinterpret_cast<Object *>(jsObjects + EvalErrorProto); }
    Object *rangeErrorPrototype() const { return reinterpret_cast<Object *>(jsObjects + RangeErrorProto); }
    Object *referenceErrorPrototype() const { return reinterpret_cast<Object *>(jsObjects + ReferenceErrorProto); }
    Object *syntaxErrorPrototype() const { return reinterpret_cast<Object *>(jsObjects + SyntaxErrorProto); }
    Object *typeErrorPrototype() const { return reinterpret_cast<Object *>(jsObjects + TypeErrorProto); }
    Object *uRIErrorPrototype() const { return reinterpret_cast<Object *>(jsObjects + URIErrorProto); }
    Object *promisePrototype() const { return reinterpret_cast<Object *>(jsObjects + PromiseProto); }
    Object *variantPrototype() const { return reinterpret_cast<Object *>(jsObjects + VariantProto); }
#if QT_CONFIG(qml_sequence_object)
    Object *sequencePrototype() const { return reinterpret_cast<Object *>(jsObjects + SequenceProto); }
#endif

    Object *sharedArrayBufferPrototype() const { return reinterpret_cast<Object *>(jsObjects + SharedArrayBufferProto); }
    Object *arrayBufferPrototype() const { return reinterpret_cast<Object *>(jsObjects + ArrayBufferProto); }
    Object *dataViewPrototype() const { return reinterpret_cast<Object *>(jsObjects + DataViewProto); }
    Object *weakSetPrototype() const { return reinterpret_cast<Object *>(jsObjects + WeakSetProto); }
    Object *setPrototype() const { return reinterpret_cast<Object *>(jsObjects + SetProto); }
    Object *weakMapPrototype() const { return reinterpret_cast<Object *>(jsObjects + WeakMapProto); }
    Object *mapPrototype() const { return reinterpret_cast<Object *>(jsObjects + MapProto); }
    Object *intrinsicTypedArrayPrototype() const { return reinterpret_cast<Object *>(jsObjects + IntrinsicTypedArrayProto); }
    Object *typedArrayPrototype;

    Object *valueTypeWrapperPrototype() const { return reinterpret_cast<Object *>(jsObjects + ValueTypeProto); }
    Object *signalHandlerPrototype() const { return reinterpret_cast<Object *>(jsObjects + SignalHandlerProto); }
    Object *iteratorPrototype() const { return reinterpret_cast<Object *>(jsObjects + IteratorProto); }
    Object *forInIteratorPrototype() const { return reinterpret_cast<Object *>(jsObjects + ForInIteratorProto); }
    Object *setIteratorPrototype() const { return reinterpret_cast<Object *>(jsObjects + SetIteratorProto); }
    Object *mapIteratorPrototype() const { return reinterpret_cast<Object *>(jsObjects + MapIteratorProto); }
    Object *arrayIteratorPrototype() const { return reinterpret_cast<Object *>(jsObjects + ArrayIteratorProto); }
    Object *stringIteratorPrototype() const { return reinterpret_cast<Object *>(jsObjects + StringIteratorProto); }

    EvalFunction *evalFunction() const { return reinterpret_cast<EvalFunction *>(jsObjects + Eval_Function); }
    FunctionObject *getStackFunction() const { return reinterpret_cast<FunctionObject *>(jsObjects + GetStack_Function); }
    FunctionObject *thrower() const { return reinterpret_cast<FunctionObject *>(jsObjects + ThrowerObject); }

    enum JSStrings {
        String_Empty,
        String_undefined,
        String_null,
        String_true,
        String_false,
        String_boolean,
        String_number,
        String_string,
        String_default,
        String_symbol,
        String_object,
        String_function,
        String_length,
        String_prototype,
        String_constructor,
        String_arguments,
        String_caller,
        String_callee,
        String_this,
        String___proto__,
        String_enumerable,
        String_configurable,
        String_writable,
        String_value,
        String_get,
        String_set,
        String_eval,
        String_uintMax,
        String_name,
        String_index,
        String_input,
        String_toString,
        String_toLocaleString,
        String_destroy,
        String_valueOf,
        String_byteLength,
        String_byteOffset,
        String_buffer,
        String_lastIndex,
        String_next,
        String_done,
        String_return,
        String_throw,
        String_global,
        String_ignoreCase,
        String_multiline,
        String_unicode,
        String_sticky,
        String_source,
        String_flags,

        NJSStrings
    };
    Value *jsStrings;

    enum JSSymbols {
        Symbol_hasInstance,
        Symbol_isConcatSpreadable,
        Symbol_iterator,
        Symbol_match,
        Symbol_replace,
        Symbol_search,
        Symbol_species,
        Symbol_split,
        Symbol_toPrimitive,
        Symbol_toStringTag,
        Symbol_unscopables,
        Symbol_revokableProxy,
        NJSSymbols
    };
    Value *jsSymbols;

    String *id_empty() const { return reinterpret_cast<String *>(jsStrings + String_Empty); }
    String *id_undefined() const { return reinterpret_cast<String *>(jsStrings + String_undefined); }
    String *id_null() const { return reinterpret_cast<String *>(jsStrings + String_null); }
    String *id_true() const { return reinterpret_cast<String *>(jsStrings + String_true); }
    String *id_false() const { return reinterpret_cast<String *>(jsStrings + String_false); }
    String *id_boolean() const { return reinterpret_cast<String *>(jsStrings + String_boolean); }
    String *id_number() const { return reinterpret_cast<String *>(jsStrings + String_number); }
    String *id_string() const { return reinterpret_cast<String *>(jsStrings + String_string); }
    String *id_default() const { return reinterpret_cast<String *>(jsStrings + String_default); }
    String *id_symbol() const { return reinterpret_cast<String *>(jsStrings + String_symbol); }
    String *id_object() const { return reinterpret_cast<String *>(jsStrings + String_object); }
    String *id_function() const { return reinterpret_cast<String *>(jsStrings + String_function); }
    String *id_length() const { return reinterpret_cast<String *>(jsStrings + String_length); }
    String *id_prototype() const { return reinterpret_cast<String *>(jsStrings + String_prototype); }
    String *id_constructor() const { return reinterpret_cast<String *>(jsStrings + String_constructor); }
    String *id_arguments() const { return reinterpret_cast<String *>(jsStrings + String_arguments); }
    String *id_caller() const { return reinterpret_cast<String *>(jsStrings + String_caller); }
    String *id_callee() const { return reinterpret_cast<String *>(jsStrings + String_callee); }
    String *id_this() const { return reinterpret_cast<String *>(jsStrings + String_this); }
    String *id___proto__() const { return reinterpret_cast<String *>(jsStrings + String___proto__); }
    String *id_enumerable() const { return reinterpret_cast<String *>(jsStrings + String_enumerable); }
    String *id_configurable() const { return reinterpret_cast<String *>(jsStrings + String_configurable); }
    String *id_writable() const { return reinterpret_cast<String *>(jsStrings + String_writable); }
    String *id_value() const { return reinterpret_cast<String *>(jsStrings + String_value); }
    String *id_get() const { return reinterpret_cast<String *>(jsStrings + String_get); }
    String *id_set() const { return reinterpret_cast<String *>(jsStrings + String_set); }
    String *id_eval() const { return reinterpret_cast<String *>(jsStrings + String_eval); }
    String *id_uintMax() const { return reinterpret_cast<String *>(jsStrings + String_uintMax); }
    String *id_name() const { return reinterpret_cast<String *>(jsStrings + String_name); }
    String *id_index() const { return reinterpret_cast<String *>(jsStrings + String_index); }
    String *id_input() const { return reinterpret_cast<String *>(jsStrings + String_input); }
    String *id_toString() const { return reinterpret_cast<String *>(jsStrings + String_toString); }
    String *id_toLocaleString() const { return reinterpret_cast<String *>(jsStrings + String_toLocaleString); }
    String *id_destroy() const { return reinterpret_cast<String *>(jsStrings + String_destroy); }
    String *id_valueOf() const { return reinterpret_cast<String *>(jsStrings + String_valueOf); }
    String *id_byteLength() const { return reinterpret_cast<String *>(jsStrings + String_byteLength); }
    String *id_byteOffset() const { return reinterpret_cast<String *>(jsStrings + String_byteOffset); }
    String *id_buffer() const { return reinterpret_cast<String *>(jsStrings + String_buffer); }
    String *id_lastIndex() const { return reinterpret_cast<String *>(jsStrings + String_lastIndex); }
    String *id_next() const { return reinterpret_cast<String *>(jsStrings + String_next); }
    String *id_done() const { return reinterpret_cast<String *>(jsStrings + String_done); }
    String *id_return() const { return reinterpret_cast<String *>(jsStrings + String_return); }
    String *id_throw() const { return reinterpret_cast<String *>(jsStrings + String_throw); }
    String *id_global() const { return reinterpret_cast<String *>(jsStrings + String_global); }
    String *id_ignoreCase() const { return reinterpret_cast<String *>(jsStrings + String_ignoreCase); }
    String *id_multiline() const { return reinterpret_cast<String *>(jsStrings + String_multiline); }
    String *id_unicode() const { return reinterpret_cast<String *>(jsStrings + String_unicode); }
    String *id_sticky() const { return reinterpret_cast<String *>(jsStrings + String_sticky); }
    String *id_source() const { return reinterpret_cast<String *>(jsStrings + String_source); }
    String *id_flags() const { return reinterpret_cast<String *>(jsStrings + String_flags); }

    Symbol *symbol_hasInstance() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_hasInstance); }
    Symbol *symbol_isConcatSpreadable() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_isConcatSpreadable); }
    Symbol *symbol_iterator() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_iterator); }
    Symbol *symbol_match() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_match); }
    Symbol *symbol_replace() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_replace); }
    Symbol *symbol_search() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_search); }
    Symbol *symbol_species() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_species); }
    Symbol *symbol_split() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_split); }
    Symbol *symbol_toPrimitive() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_toPrimitive); }
    Symbol *symbol_toStringTag() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_toStringTag); }
    Symbol *symbol_unscopables() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_unscopables); }
    Symbol *symbol_revokableProxy() const { return reinterpret_cast<Symbol *>(jsSymbols + Symbol_revokableProxy); }

#ifndef V4_BOOTSTRAP
    QIntrusiveList<CompiledData::CompilationUnit, &CompiledData::CompilationUnit::nextCompilationUnit> compilationUnits;
#endif

    quint32 m_engineId;

    RegExpCache *regExpCache;

    // Scarce resources are "exceptionally high cost" QVariant types where allowing the
    // normal JavaScript GC to clean them up is likely to lead to out-of-memory or other
    // out-of-resource situations.  When such a resource is passed into JavaScript we
    // add it to the scarceResources list and it is destroyed when we return from the
    // JavaScript execution that created it.  The user can prevent this behavior by
    // calling preserve() on the object which removes it from this scarceResource list.
    class ScarceResourceData {
    public:
        ScarceResourceData(const QVariant &data = QVariant()) : data(data) {}
        QVariant data;
        QIntrusiveListNode node;
    };
    QIntrusiveList<ScarceResourceData, &ScarceResourceData::node> scarceResources;

    // Normally the JS wrappers for QObjects are stored in the QQmlData/QObjectPrivate,
    // but any time a QObject is wrapped a second time in another engine, we have to do
    // bookkeeping.
    MultiplyWrappedQObjectMap *m_multiplyWrappedQObjects;
#if QT_CONFIG(qml_jit)
    const bool m_canAllocateExecutableMemory;
#endif

    quintptr protoIdCount = 1;

    ExecutionEngine(QJSEngine *jsEngine = nullptr);
    ~ExecutionEngine();

#if !QT_CONFIG(qml_debug)
    QV4::Debugging::Debugger *debugger() const { return nullptr; }
    QV4::Profiling::Profiler *profiler() const { return nullptr; }

    void setDebugger(Debugging::Debugger *) {}
    void setProfiler(Profiling::Profiler *) {}
#else
    QV4::Debugging::Debugger *debugger() const { return m_debugger.data(); }
    QV4::Profiling::Profiler *profiler() const { return m_profiler.data(); }

    void setDebugger(Debugging::Debugger *debugger);
    void setProfiler(Profiling::Profiler *profiler);
#endif // QT_CONFIG(qml_debug)

    ExecutionContext *currentContext() const;

    // ensure we always get odd prototype IDs. This helps make marking in QV4::Lookup fast
    quintptr newProtoId() { return (protoIdCount += 2); }

    Heap::InternalClass *newInternalClass(const VTable *vtable, Object *prototype);

    Heap::Object *newObject();
    Heap::Object *newObject(Heap::InternalClass *internalClass);

    Heap::String *newString(const QString &s = QString());
    Heap::String *newIdentifier(const QString &text);

    Heap::Object *newStringObject(const String *string);
    Heap::Object *newSymbolObject(const Symbol *symbol);
    Heap::Object *newNumberObject(double value);
    Heap::Object *newBooleanObject(bool b);

    Heap::ArrayObject *newArrayObject(int count = 0);
    Heap::ArrayObject *newArrayObject(const Value *values, int length);
    Heap::ArrayObject *newArrayObject(const QStringList &list);
    Heap::ArrayObject *newArrayObject(Heap::InternalClass *ic);

    Heap::ArrayBuffer *newArrayBuffer(const QByteArray &array);
    Heap::ArrayBuffer *newArrayBuffer(size_t length);

    Heap::DateObject *newDateObject(const Value &value);
    Heap::DateObject *newDateObject(const QDateTime &dt);
    Heap::DateObject *newDateObjectFromTime(const QTime &t);

    Heap::RegExpObject *newRegExpObject(const QString &pattern, int flags);
    Heap::RegExpObject *newRegExpObject(RegExp *re);
    Heap::RegExpObject *newRegExpObject(const QRegExp &re);
#if QT_CONFIG(regularexpression)
    Heap::RegExpObject *newRegExpObject(const QRegularExpression &re);
#endif

    Heap::Object *newErrorObject(const Value &value);
    Heap::Object *newErrorObject(const QString &message);
    Heap::Object *newSyntaxErrorObject(const QString &message, const QString &fileName, int line, int column);
    Heap::Object *newSyntaxErrorObject(const QString &message);
    Heap::Object *newReferenceErrorObject(const QString &message);
    Heap::Object *newReferenceErrorObject(const QString &message, const QString &fileName, int line, int column);
    Heap::Object *newTypeErrorObject(const QString &message);
    Heap::Object *newRangeErrorObject(const QString &message);
    Heap::Object *newURIErrorObject(const QString &message);
    Heap::Object *newURIErrorObject(const Value &message);
    Heap::Object *newEvalErrorObject(const QString &message);

    Heap::PromiseObject *newPromiseObject();
    Heap::Object *newPromiseObject(const QV4::FunctionObject *thisObject, const QV4::PromiseCapability *capability);
    Promise::ReactionHandler *getPromiseReactionHandler();

    Heap::Object *newVariantObject(const QVariant &v);

    Heap::Object *newForInIteratorObject(Object *o);
    Heap::Object *newSetIteratorObject(Object *o);
    Heap::Object *newMapIteratorObject(Object *o);
    Heap::Object *newArrayIteratorObject(Object *o);

    Heap::QmlContext *qmlContext() const;
    QObject *qmlScopeObject() const;
    QQmlContextData *callingQmlContext() const;


    StackTrace stackTrace(int frameLimit = -1) const;
    QUrl resolvedUrl(const QString &file);

    void markObjects(MarkStack *markStack);

    void initRootContext();

    Heap::InternalClass *newClass(Heap::InternalClass *other);

    StackTrace exceptionStackTrace;

    ReturnedValue throwError(const Value &value);
    ReturnedValue catchException(StackTrace *trace = nullptr);

    ReturnedValue throwError(const QString &message);
    ReturnedValue throwSyntaxError(const QString &message);
    ReturnedValue throwSyntaxError(const QString &message, const QString &fileName, int lineNumber, int column);
    ReturnedValue throwTypeError();
    ReturnedValue throwTypeError(const QString &message);
    ReturnedValue throwReferenceError(const Value &value);
    ReturnedValue throwReferenceError(const QString &name);
    ReturnedValue throwReferenceError(const QString &value, const QString &fileName, int lineNumber, int column);
    ReturnedValue throwRangeError(const Value &value);
    ReturnedValue throwRangeError(const QString &message);
    ReturnedValue throwURIError(const Value &msg);
    ReturnedValue throwUnimplemented(const QString &message);

    // Use only inside catch(...) -- will re-throw if no JS exception
    QQmlError catchExceptionAsQmlError();

    // variant conversions
    QVariant toVariant(const QV4::Value &value, int typeHint, bool createJSValueForObjects = true);
    QV4::ReturnedValue fromVariant(const QVariant &);

    QVariantMap variantMapFromJS(const QV4::Object *o);

    bool metaTypeFromJS(const Value *value, int type, void *data);
    QV4::ReturnedValue metaTypeToJS(int type, const void *data);

    bool checkStackLimits();

    bool canJIT(Function *f = nullptr)
    {
#if QT_CONFIG(qml_jit)
        if (!m_canAllocateExecutableMemory)
            return false;
        if (f)
            return !f->isGenerator() && f->interpreterCallCount >= jitCallCountThreshold;
        return true;
#else
        Q_UNUSED(f);
        return false;
#endif
    }

    QV4::ReturnedValue global();

    double localTZA = 0.0; // local timezone, initialized at startup

    static QQmlRefPointer<CompiledData::CompilationUnit> compileModule(bool debugMode, const QString &url, const QString &sourceCode, const QDateTime &sourceTimeStamp, QList<QQmlJS::DiagnosticMessage> *diagnostics);
#ifndef V4_BOOTSTRAP
    QQmlRefPointer<CompiledData::CompilationUnit> compileModule(const QUrl &url);
    QQmlRefPointer<CompiledData::CompilationUnit> compileModule(const QUrl &url, const QString &sourceCode, const QDateTime &sourceTimeStamp);

    mutable QMutex moduleMutex;
    QHash<QUrl, QQmlRefPointer<CompiledData::CompilationUnit>> modules;
    void injectModule(const QQmlRefPointer<CompiledData::CompilationUnit> &moduleUnit);
    QQmlRefPointer<CompiledData::CompilationUnit> moduleForUrl(const QUrl &_url, const CompiledData::CompilationUnit *referrer = nullptr) const;
    QQmlRefPointer<CompiledData::CompilationUnit> loadModule(const QUrl &_url, const CompiledData::CompilationUnit *referrer = nullptr);
#endif

private:
#if QT_CONFIG(qml_debug)
    QScopedPointer<QV4::Debugging::Debugger> m_debugger;
    QScopedPointer<QV4::Profiling::Profiler> m_profiler;
#endif
    int jitCallCountThreshold;

    // used by generated Promise objects to handle 'then' events
    QScopedPointer<QV4::Promise::ReactionHandler> m_reactionHandler;
};

#define CHECK_STACK_LIMITS(v4) if ((v4)->checkStackLimits()) return Encode::undefined(); \
    ExecutionEngineCallDepthRecorder _executionEngineCallDepthRecorder(v4);

struct ExecutionEngineCallDepthRecorder
{
    ExecutionEngine *ee;

    ExecutionEngineCallDepthRecorder(ExecutionEngine *e): ee(e) { ++ee->callDepth; }
    ~ExecutionEngineCallDepthRecorder() { --ee->callDepth; }
};

inline bool ExecutionEngine::checkStackLimits()
{
    if (Q_UNLIKELY((jsStackTop > jsStackLimit) || (callDepth >= maxCallDepth))) {
        throwRangeError(QStringLiteral("Maximum call stack size exceeded."));
        return true;
    }

    return false;
}

} // namespace QV4

QT_END_NAMESPACE

#endif // QV4ENGINE_H