summaryrefslogtreecommitdiff
path: root/src/mongo/scripting/mozjs/implscope.cpp
blob: 0d5d36756039449e37b2e9ee8cacdae1d9127149 (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
/**
 * Copyright (C) 2015 MongoDB Inc.
 *
 * This program is free software: you can redistribute it and/or  modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * As a special exception, the copyright holders give permission to link the
 * code of portions of this program with the OpenSSL library under certain
 * conditions as described in each individual source file and distribute
 * linked combinations including the program with the OpenSSL library. You
 * must comply with the GNU Affero General Public License in all respects
 * for all of the code used other than as permitted herein. If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so. If you do not
 * wish to do so, delete this exception statement from your version. If you
 * delete this exception statement from all source files in the program,
 * then also delete it in the license file.
 */

#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kQuery

#include "mongo/platform/basic.h"

#include "mongo/scripting/mozjs/implscope.h"

#include <jscustomallocator.h>
#include <jsfriendapi.h>

#include "mongo/base/error_codes.h"
#include "mongo/db/operation_context.h"
#include "mongo/scripting/mozjs/objectwrapper.h"
#include "mongo/scripting/mozjs/valuereader.h"
#include "mongo/scripting/mozjs/valuewriter.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/concurrency/threadlocal.h"
#include "mongo/util/log.h"

using namespace mongoutils;

namespace mongo {

// Generated symbols for JS files
namespace JSFiles {
extern const JSFile types;
extern const JSFile assert;
}  // namespace

namespace mozjs {

const char* const MozJSImplScope::kExecResult = "__lastres__";
const char* const MozJSImplScope::kInvokeResult = "__returnValue";

namespace {

/**
 * The maximum amount of memory to be given out per thread to mozilla. We
 * manage this by trapping all calls to malloc, free, etc. and keeping track of
 * counts in some thread locals
 */
const size_t kMallocMemoryLimit = 1024ul * 1024 * 1024 * 1.1;

/**
 * The number of bytes to allocate after which garbage collection is run
 */
const int kMaxBytesBeforeGC = 8 * 1024 * 1024;

/**
 * The size, in bytes, of each "stack chunk". 8192 is the recommended amount
 * from mozilla
 */
const int kStackChunkSize = 8192;

/**
 * Runtime's can race on first creation (on some function statics), so we just
 * serialize the initial Runtime creation.
 */
stdx::mutex gRuntimeCreationMutex;
bool gFirstRuntimeCreated = false;

}  // namespace

MONGO_TRIVIALLY_CONSTRUCTIBLE_THREAD_LOCAL MozJSImplScope* kCurrentScope;

struct MozJSImplScope::MozJSEntry {
    MozJSEntry(MozJSImplScope* scope) : ar(scope->_context), ac(scope->_context, scope->_global) {}

    JSAutoRequest ar;
    JSAutoCompartment ac;
};

void MozJSImplScope::_reportError(JSContext* cx, const char* message, JSErrorReport* report) {
    auto scope = getScope(cx);

    if (!JSREPORT_IS_WARNING(report->flags)) {
        scope->_status =
            Status(report->errorNumber ? static_cast<ErrorCodes::Error>(report->errorNumber)
                                       : ErrorCodes::JSInterpreterFailure,
                   str::stream() << message << ":\n"
                                 << JS::FormatStackDump(cx, nullptr, true, true, false) << "\n");
    }
}

std::string MozJSImplScope::getError() {
    return "";
}

void MozJSImplScope::registerOperation(OperationContext* txn) {
    invariant(_opId == 0);
    _opId = txn->getOpID();

    _engine->registerOperation(txn, this);
}

void MozJSImplScope::unregisterOperation() {
    if (_opId != 0) {
        _engine->unregisterOperation(_opId);

        _opId = 0;
    }
}

void MozJSImplScope::kill() {
    _pendingKill.store(true);
    JS_RequestInterruptCallback(_runtime);
}

bool MozJSImplScope::isKillPending() const {
    return _pendingKill.load();
}

OperationContext* MozJSImplScope::getOpContext() const {
    return _opCtx;
}

bool MozJSImplScope::_interruptCallback(JSContext* cx) {
    auto scope = getScope(cx);

    if (scope->_pendingGC.load()) {
        JS_GC(scope->_runtime);
    }

    bool kill = scope->isKillPending();

    if (kill) {
        scope->_engine->getDeadlineMonitor().stopDeadline(scope);
        scope->unregisterOperation();
    }

    return !kill;
}

void MozJSImplScope::_gcCallback(JSRuntime* rt, JSGCStatus status, void* data) {
    if (!shouldLog(logger::LogSeverity::Debug(1))) {
        // don't collect stats unless verbose
        return;
    }

    log() << "MozJS GC " << (status == JSGC_BEGIN ? "prologue" : "epilogue") << " heap stats - "
          << " total: " << mongo::sm::get_total_bytes() << " limit: " << mongo::sm::get_max_bytes()
          << std::endl;
}

MozJSImplScope::MozRuntime::MozRuntime() {
    mongo::sm::reset(kMallocMemoryLimit);

    {
        stdx::unique_lock<stdx::mutex> lk(gRuntimeCreationMutex);

        if (gFirstRuntimeCreated) {
            // If we've already made a runtime, just proceed
            lk.unlock();
        } else {
            // If this is the first one, hold the lock until after the first
            // one's done
            gFirstRuntimeCreated = true;
        }

        _runtime = JS_NewRuntime(kMaxBytesBeforeGC);
    }

    uassert(ErrorCodes::JSInterpreterFailure, "Failed to initialize JSRuntime", _runtime);

    _context = JS_NewContext(_runtime, kStackChunkSize);
    uassert(ErrorCodes::JSInterpreterFailure, "Failed to initialize JSContext", _context);
}

MozJSImplScope::MozRuntime::~MozRuntime() {
    JS_DestroyContext(_context);
    JS_DestroyRuntime(_runtime);
}

MozJSImplScope::MozJSImplScope(MozJSScriptEngine* engine)
    : _engine(engine),
      _mr(),
      _runtime(_mr._runtime),
      _context(_mr._context),
      _globalProto(_context),
      _global(_globalProto.getProto()),
      _funcs(),
      _pendingKill(false),
      _opId(0),
      _opCtx(nullptr),
      _pendingGC(false),
      _connectState(ConnectState::Not),
      _status(Status::OK()),
      _binDataProto(_context),
      _bsonProto(_context),
      _countDownLatchProto(_context),
      _cursorProto(_context),
      _dbCollectionProto(_context),
      _dbPointerProto(_context),
      _dbQueryProto(_context),
      _dbProto(_context),
      _dbRefProto(_context),
      _jsThreadProto(_context),
      _maxKeyProto(_context),
      _minKeyProto(_context),
      _mongoExternalProto(_context),
      _mongoLocalProto(_context),
      _nativeFunctionProto(_context),
      _numberIntProto(_context),
      _numberLongProto(_context),
      _objectProto(_context),
      _oidProto(_context),
      _regExpProto(_context),
      _timestampProto(_context) {
    kCurrentScope = this;

    // The default is quite low and doesn't seem to directly correlate with
    // malloc'd bytes.  Set it to MAX_INT here and catching things in the
    // jscustomallocator.cpp
    JS_SetGCParameter(_runtime, JSGC_MAX_BYTES, 0xffffffff);

    JS_SetInterruptCallback(_runtime, _interruptCallback);
    JS_SetGCCallback(_runtime, _gcCallback, this);
    JS_SetContextPrivate(_context, this);
    JSAutoRequest ar(_context);

    JS_SetErrorReporter(_runtime, _reportError);

    JSAutoCompartment ac(_context, _global);

    _checkErrorState(JS_InitStandardClasses(_context, _global));

    installBSONTypes();
    execSetup(JSFiles::assert);
    execSetup(JSFiles::types);

    // install process-specific utilities in the global scope (dependancy: types.js, assert.js)
    if (_engine->getScopeInitCallback())
        _engine->getScopeInitCallback()(*this);

    // install global utility functions
    installGlobalUtils(*this);
}

MozJSImplScope::~MozJSImplScope() {
    for (auto&& x : _funcs) {
        x.reset();
    }

    unregisterOperation();
}

bool MozJSImplScope::hasOutOfMemoryException() {
    return false;
}

void MozJSImplScope::init(const BSONObj* data) {
    if (!data)
        return;

    BSONObjIterator i(*data);
    while (i.more()) {
        BSONElement e = i.next();
        setElement(e.fieldName(), e);
    }
}

void MozJSImplScope::setNumber(const char* field, double val) {
    MozJSEntry entry(this);

    ObjectWrapper(_context, _global).setNumber(field, val);
}

void MozJSImplScope::setString(const char* field, StringData val) {
    MozJSEntry entry(this);

    ObjectWrapper(_context, _global).setString(field, val);
}

void MozJSImplScope::setBoolean(const char* field, bool val) {
    MozJSEntry entry(this);

    ObjectWrapper(_context, _global).setBoolean(field, val);
}

void MozJSImplScope::setElement(const char* field, const BSONElement& e) {
    MozJSEntry entry(this);

    ObjectWrapper(_context, _global).setBSONElement(field, e, false);
}

void MozJSImplScope::setObject(const char* field, const BSONObj& obj, bool readOnly) {
    MozJSEntry entry(this);

    ObjectWrapper(_context, _global).setBSON(field, obj, readOnly);
}

int MozJSImplScope::type(const char* field) {
    MozJSEntry entry(this);

    return ObjectWrapper(_context, _global).type(field);
}

double MozJSImplScope::getNumber(const char* field) {
    MozJSEntry entry(this);

    return ObjectWrapper(_context, _global).getNumber(field);
}

int MozJSImplScope::getNumberInt(const char* field) {
    MozJSEntry entry(this);

    return ObjectWrapper(_context, _global).getNumberInt(field);
}

long long MozJSImplScope::getNumberLongLong(const char* field) {
    MozJSEntry entry(this);

    return ObjectWrapper(_context, _global).getNumberLongLong(field);
}

std::string MozJSImplScope::getString(const char* field) {
    MozJSEntry entry(this);

    return ObjectWrapper(_context, _global).getString(field);
}

bool MozJSImplScope::getBoolean(const char* field) {
    MozJSEntry entry(this);

    return ObjectWrapper(_context, _global).getBoolean(field);
}

BSONObj MozJSImplScope::getObject(const char* field) {
    MozJSEntry entry(this);

    return ObjectWrapper(_context, _global).getObject(field);
}

void MozJSImplScope::newFunction(StringData raw, JS::MutableHandleValue out) {
    MozJSEntry entry(this);

    std::string code = str::stream() << "____MongoToSM_newFunction_temp = " << raw;

    JS::CompileOptions co(_context);
    setCompileOptions(&co);
    _checkErrorState(JS::Evaluate(_context, _global, co, code.c_str(), code.length(), out));
}

BSONObj MozJSImplScope::callThreadArgs(const BSONObj& args) {
    MozJSEntry entry(this);

    JS::RootedValue function(_context);
    ValueReader(_context, &function).fromBSONElement(args.firstElement(), true);

    int argc = args.nFields() - 1;

    JS::AutoValueVector argv(_context);
    BSONObjIterator it(args);
    it.next();
    JS::RootedValue value(_context);

    for (int i = 0; i < argc; ++i) {
        ValueReader(_context, &value).fromBSONElement(*it, true);
        argv.append(value);
        it.next();
    }

    JS::RootedValue out(_context);
    JS::RootedObject thisv(_context);

    bool success = JS::Call(_context, thisv, function, argv, &out);

    if (!success) {
        auto status = currentJSExceptionToStatus(
            _context, ErrorCodes::JSInterpreterFailure, "Unknown callThread failure");

        log() << "js thread raised js exception: " << status;

        uasserted(status.code(), status.reason());
    }

    BSONObjBuilder b;
    ValueWriter(_context, out).writeThis(&b, "ret");

    return b.obj();
}

bool hasFunctionIdentifier(StringData code) {
    if (code.size() < 9 || code.find("function") != 0)
        return false;

    return code[8] == ' ' || code[8] == '(';
}

// TODO: This function identification code is broken.  Fix it up to be more robust
//
// See: SERVER-16703 for more info
void MozJSImplScope::_MozJSCreateFunction(const char* raw,
                                          ScriptingFunction functionNumber,
                                          JS::MutableHandleValue fun) {
    std::string code = jsSkipWhiteSpace(raw);
    if (!hasFunctionIdentifier(code)) {
        if (code.find('\n') == std::string::npos && !hasJSReturn(code) &&
            (code.find(';') == std::string::npos || code.find(';') == code.size() - 1)) {
            code = "return " + code;
        }
        code = "function(){ " + code + "}";
    }

    code = str::stream() << "_funcs" << functionNumber << " = " << code;

    JS::CompileOptions co(_context);
    setCompileOptions(&co);

    _checkErrorState(JS::Evaluate(_context, _global, co, code.c_str(), code.length(), fun));
    uassert(10232,
            "not a function",
            fun.isObject() && JS_ObjectIsFunction(_context, fun.toObjectOrNull()));
}

ScriptingFunction MozJSImplScope::_createFunction(const char* raw,
                                                  ScriptingFunction functionNumber) {
    MozJSEntry entry(this);

    JS::RootedValue fun(_context);
    _MozJSCreateFunction(raw, functionNumber, &fun);
    _funcs.emplace_back(_context, fun.get());

    return functionNumber;
}

void MozJSImplScope::setFunction(const char* field, const char* code) {
    MozJSEntry entry(this);

    JS::RootedValue fun(_context);

    _MozJSCreateFunction(code, getFunctionCache().size() + 1, &fun);

    ObjectWrapper(_context, _global).setValue(field, fun);
}

void MozJSImplScope::rename(const char* from, const char* to) {
    MozJSEntry entry(this);

    ObjectWrapper(_context, _global).rename(from, to);
}

int MozJSImplScope::invoke(ScriptingFunction func,
                           const BSONObj* argsObject,
                           const BSONObj* recv,
                           int timeoutMs,
                           bool ignoreReturn,
                           bool readOnlyArgs,
                           bool readOnlyRecv) {
    MozJSEntry entry(this);

    auto funcValue = _funcs[func - 1];
    JS::RootedValue result(_context);

    const int nargs = argsObject ? argsObject->nFields() : 0;

    JS::AutoValueVector args(_context);

    if (nargs) {
        BSONObjIterator it(*argsObject);
        for (int i = 0; i < nargs; i++) {
            BSONElement next = it.next();

            JS::RootedValue value(_context);
            ValueReader(_context, &value).fromBSONElement(next, readOnlyArgs);

            args.append(value);
        }
    }

    JS::RootedValue smrecv(_context);
    if (recv)
        ValueReader(_context, &smrecv).fromBSON(*recv, readOnlyRecv);
    else
        smrecv.setObjectOrNull(_global);

    if (timeoutMs)
        _engine->getDeadlineMonitor().startDeadline(this, timeoutMs);

    JS::RootedValue out(_context);
    JS::RootedObject obj(_context, smrecv.toObjectOrNull());

    bool success = JS::Call(_context, obj, funcValue, args, &out);

    if (timeoutMs)
        _engine->getDeadlineMonitor().stopDeadline(this);

    _checkErrorState(success);

    if (!ignoreReturn) {
        // must validate the handle because TerminateExecution may have
        // been thrown after the above checks
        if (out.isObject() && _nativeFunctionProto.instanceOf(out)) {
            warning() << "storing native function as return value";
            _lastRetIsNativeCode = true;
        } else {
            _lastRetIsNativeCode = false;
        }

        ObjectWrapper(_context, _global).setValue(kInvokeResult, out);
    }

    return 0;
}

bool MozJSImplScope::exec(StringData code,
                          const std::string& name,
                          bool printResult,
                          bool reportError,
                          bool assertOnError,
                          int timeoutMs) {
    MozJSEntry entry(this);

    JS::CompileOptions co(_context);
    setCompileOptions(&co);
    JS::RootedScript script(_context);

    bool success = JS::Compile(_context, _global, co, code.rawData(), code.size(), &script);

    if (_checkErrorState(success, reportError, assertOnError))
        return false;

    if (timeoutMs)
        _engine->getDeadlineMonitor().startDeadline(this, timeoutMs);

    JS::RootedValue out(_context);

    success = JS_ExecuteScript(_context, _global, script, &out);

    if (timeoutMs)
        _engine->getDeadlineMonitor().stopDeadline(this);

    if (_checkErrorState(success, reportError, assertOnError))
        return false;

    ObjectWrapper(_context, _global).setValue(kExecResult, out);

    if (printResult && !out.isUndefined()) {
        // TODO: We seem to use this productively in v8, but it seems
        // unecessary under sm.  That probably means somethings off
        //
        // appears to only be used by shell
        // std::cout << ValueWriter(_context, out).toString() << std::endl;
    }

    return true;
}

void MozJSImplScope::injectNative(const char* field, NativeFunction func, void* data) {
    MozJSEntry entry(this);

    JS::RootedObject obj(_context);

    NativeFunctionInfo::make(_context, &obj, func, data);

    JS::RootedValue value(_context);
    value.setObjectOrNull(obj);
    ObjectWrapper(_context, _global).setValue(field, value);
}

void MozJSImplScope::gc() {
    _pendingGC.store(true);
    JS_RequestInterruptCallback(_runtime);
}

void MozJSImplScope::localConnectForDbEval(OperationContext* txn, const char* dbName) {
    MozJSEntry entry(this);

    invariant(_opCtx == NULL);
    _opCtx = txn;

    if (_connectState == ConnectState::External)
        uasserted(12510, "externalSetup already called, can't call localConnect");
    if (_connectState == ConnectState::Local) {
        if (_localDBName == dbName)
            return;
        uasserted(12511,
                  str::stream() << "localConnect previously called with name " << _localDBName);
    }

    // NOTE: order is important here.  the following methods must be called after
    //       the above conditional statements.

    // install db access functions in the global object
    installDBAccess();

    // install the Mongo function object and instantiate the 'db' global
    _mongoLocalProto.install(_global);
    execCoreFiles();

    const char* const makeMongo = "_mongo = new Mongo()";
    exec(makeMongo, "local connect 2", false, true, true, 0);

    std::string makeDB = str::stream() << "db = _mongo.getDB(\"" << dbName << "\");";
    exec(makeDB, "local connect 3", false, true, true, 0);

    _connectState = ConnectState::Local;
    _localDBName = dbName;

    loadStored(txn);
}

void MozJSImplScope::externalSetup() {
    MozJSEntry entry(this);

    if (_connectState == ConnectState::External)
        return;
    if (_connectState == ConnectState::Local)
        uasserted(12512, "localConnect already called, can't call externalSetup");

    mongo::sm::reset(0);

    // install db access functions in the global object
    installDBAccess();

    // install thread-related functions (e.g. _threadInject)
    installFork();

    // install the Mongo function object
    _mongoExternalProto.install(_global);
    execCoreFiles();
    _connectState = ConnectState::External;
}

void MozJSImplScope::reset() {
    unregisterOperation();
    _pendingKill.store(false);
    _pendingGC.store(false);
}

void MozJSImplScope::installBSONTypes() {
    _binDataProto.install(_global);
    _bsonProto.install(_global);
    _dbPointerProto.install(_global);
    _dbRefProto.install(_global);
    _maxKeyProto.install(_global);
    _minKeyProto.install(_global);
    _nativeFunctionProto.install(_global);
    _numberIntProto.install(_global);
    _numberLongProto.install(_global);
    _objectProto.install(_global);
    _oidProto.install(_global);
    _regExpProto.install(_global);
    _timestampProto.install(_global);

    // This builtin map is a javascript 6 thing.  We want our version.  so
    // take theirs out
    ObjectWrapper(_context, _global).deleteProperty("Map");
}

void MozJSImplScope::installDBAccess() {
    _cursorProto.install(_global);
    _dbProto.install(_global);
    _dbQueryProto.install(_global);
    _dbCollectionProto.install(_global);
}

void MozJSImplScope::installFork() {
    _countDownLatchProto.install(_global);
    _jsThreadProto.install(_global);
}

bool MozJSImplScope::_checkErrorState(bool success, bool reportError, bool assertOnError) {
    if (success)
        return false;

    if (_status.isOK()) {
        _status = Status(ErrorCodes::UnknownError, "Unknown Failure from JSInterpreter");
    }

    _error = _status.reason();

    if (reportError)
        error() << _error << std::endl;

    // Clear the status state
    auto status = std::move(_status);

    if (assertOnError) {
        // Throw if necessary
        uassertStatusOK(status);
    }

    return true;
}


void MozJSImplScope::setCompileOptions(JS::CompileOptions* co) {
    co->setUTF8(true);
}

MozJSImplScope* MozJSImplScope::getThreadScope() {
    return kCurrentScope;
}

void MozJSImplScope::setOOM() {
    _status = Status(ErrorCodes::JSInterpreterFailure, "Out of memory");
}

}  // namespace mozjs
}  // namespace mongo