Repository navigation
Expand file tree
/
Copy pathFTLOperations.cpp
More file actions
985 lines (858 loc) · 46.2 KB
/
Copy pathFTLOperations.cpp
File metadata and controls
985 lines (858 loc) · 46.2 KB
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
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
/*
* Copyright (C) 2014-2024 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "FTLOperations.h"
#if ENABLE(FTL_JIT)
#include "BytecodeStructs.h"
#include "ClonedArguments.h"
#include "CommonSlowPaths.h"
#include "DirectArguments.h"
#include "FTLJITCode.h"
#include "FTLLazySlowPath.h"
#include "FrameTracers.h"
#include "InlineCallFrame.h"
#include "JSArrayIterator.h"
#include "JSAsyncFromSyncIterator.h"
#include "JSAsyncFunction.h"
#include "JSAsyncFunctionGenerator.h"
#include "JSAsyncGenerator.h"
#include "JSAsyncGeneratorFunction.h"
#include "JSCellButterfly.h"
#include "JSCInlines.h"
#include "JSGenerator.h"
#include "JSGeneratorFunction.h"
#include "JSIteratorHelper.h"
#include "JSLexicalEnvironmentInlines.h"
#include "JSMapIterator.h"
#include "JSPromise.h"
#include "JSPromiseReaction.h"
#include "JSRegExpStringIterator.h"
#include "JSSetIterator.h"
#include "JSStringIterator.h"
#include "JSWrapForValidIterator.h"
#include "RegExpObject.h"
#include "ResourceExhaustion.h"
#include "VMTrapsInlines.h"
#include <wtf/Assertions.h>
IGNORE_WARNINGS_BEGIN("frame-address")
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC { namespace FTL {
JSC_DEFINE_NOEXCEPT_JIT_OPERATION(operationPopulateObjectInOSR, void, (JSGlobalObject* globalObject, ExitTimeObjectMaterialization* materialization, EncodedJSValue* encodedValue, EncodedJSValue* values))
{
using namespace DFG;
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
CodeBlock* codeBlock = callFrame->codeBlock();
// We cannot GC. We've got pointers in evil places.
// FIXME: We are not doing anything that can GC here, and this is
// probably unnecessary.
DeferGCForAWhile deferGC(vm);
switch (materialization->type()) {
case PhantomNewArrayWithButterfly: {
auto scope = DECLARE_THROW_SCOPE(vm);
// This might be unnecessary because operationMaterializeObjectInOSR does DeferGCForAWhile but its better to be safe.
JSArray* array = uncheckedDowncast<JSArray>(JSValue::decode(*encodedValue));
// This may be called during a GenericUnwind OSR exit (e.g. stack overflow caught by
// try/catch), where vm.exception() is already set. Suspend it so the assertion below
// only fires on new exceptions from putDirectIndex; it is restored on scope exit.
SuspendExceptionScope suspendException(vm);
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() != ArrayIndexedPropertyPLoc)
continue;
JSValue value = JSValue::decode(values[i]);
unsigned index = property.location().info();
// When a double array element's Phi resolves to PNaN (the hole default), the OSR exit
// compiler boxes it as jsNumber(NaN). To preserve hole semantics for double Arrays,
// store PNaN directly instead of going through putDirectIndex which would trigger a
// double-to-contiguous conversion. This is safe because values written to sunk double
// arrays use DoubleRepRealUse (proven non-NaN), so any NaN here must be the hole
// sentinel and is not user-visible.
//
// The analogous case for Int32/Contiguous arrays: an unwritten element's Phi resolves
// to the empty JSValue, which is the hole sentinel for these indexing types. For Int32
// arrays, putDirectIndex would spuriously convert the array to Contiguous because the
// empty JSValue is not an Int32. Contiguous is also handled here for the debug ASSERT
// in putDirectIndex that null-derefs on the empty JSValue. Write directly into the
// butterfly to preserve the indexing type.
//
// If the VM had a bad time between FTL compilation and this OSR exit, the Array was
// switched to SlowPutArrayStorage in operationMaterializeObjectInOSR. A hole must then
// be cleared in the ArrayStorage vector rather than the contiguous butterfly to match
// the rematerialized layout. Note that the hole arrives as the hole sentinel of the
// indexing type the Array was sunk with, not of the Array's current indexing type:
// boxed NaN if the Array was sunk as Double, the empty JSValue otherwise.
// m_numValuesInVector is also decremented because the cleared slot was counted when
// the sentinel-filled butterfly was converted to ArrayStorage.
bool valueIsHole = hasDouble(materialization->indexingType()) ? value.isNumber() && isHole(value.asNumber()) : !value;
if (hasDouble(array->indexingType()) && valueIsHole) [[unlikely]]
array->butterfly()->contiguousDouble().atUnsafe(index) = PNaN;
else if ((hasInt32(array->indexingType()) || hasContiguous(array->indexingType())) && valueIsHole) [[unlikely]]
array->butterfly()->contiguous().atUnsafe(index).setStartingValue(JSValue());
else if (hasAnyArrayStorage(array->indexingType()) && valueIsHole) [[unlikely]] {
ArrayStorage* storage = array->butterfly()->arrayStorage();
ASSERT(storage->m_vector[index]);
ASSERT(storage->m_numValuesInVector);
storage->m_vector[index].clear();
storage->m_numValuesInVector--;
} else
array->putDirectIndex(globalObject, index, value);
scope.assertNoExceptionExceptTermination();
}
// This might be unnecessary because operationMaterializeObjectInOSR does DeferGCForAWhile but its better to be safe.
if (hasContiguous(array->indexingType()) || hasAnyArrayStorage(array->indexingType()))
vm.writeBarrier(array);
break;
}
case PhantomNewObject: {
JSFinalObject* object = uncheckedDowncast<JSFinalObject>(JSValue::decode(*encodedValue));
Structure* structure = object->structure();
// Figure out what the heck to populate the object with. Use
// getPropertiesConcurrently() because that happens to be
// lower-level and more convenient. It doesn't change the
// materialization of the property table. We want to have
// minimal visible effects on the system. Also, don't mind
// that this is O(n^2). It doesn't matter. We only get here
// from OSR exit.
for (const PropertyTableEntry& entry : structure->getPropertiesConcurrently()) {
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() != NamedPropertyPLoc)
continue;
if (codeBlock->identifier(property.location().info()).impl() != entry.key())
continue;
object->putDirectOffset(vm, entry.offset(), JSValue::decode(values[i]));
}
}
break;
}
case PhantomNewButterflyWithSize:
case PhantomNewFunction:
case PhantomNewGeneratorFunction:
case PhantomNewAsyncFunction:
case PhantomNewAsyncGeneratorFunction:
case PhantomDirectArguments:
case PhantomClonedArguments:
case PhantomCreateRest:
case PhantomSpread:
case PhantomNewArrayWithSpread:
case PhantomNewArrayBuffer:
case PhantomNewPromise:
// Those are completely handled by operationMaterializeObjectInOSR
break;
case PhantomCreateActivation: {
JSLexicalEnvironment* activation = uncheckedDowncast<JSLexicalEnvironment>(JSValue::decode(*encodedValue));
// Figure out what to populate the activation with
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() != ClosureVarPLoc)
continue;
activation->variableAt(ScopeOffset(property.location().info())).set(vm, activation, JSValue::decode(values[i]));
}
break;
}
case PhantomNewInternalFieldObject: {
auto materialize = [&] (auto* target) {
using JSCellType = std::remove_reference_t<decltype(*target)>;
// Figure out what to populate the iterator with
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() != InternalFieldObjectPLoc)
continue;
ASSERT(property.location().info() < JSCellType::numberOfInternalFields);
target->internalField(static_cast<typename JSCellType::Field>(property.location().info())).set(vm, target, JSValue::decode(values[i]));
}
};
JSObject* class="pl-c1">JSValue::decode(*encodedValue));
switch (target->type()) {
case JSArrayIteratorType:
materialize(uncheckedDowncast<JSArrayIterator>(target));
break;
case JSMapIteratorType:
materialize(uncheckedDowncast<JSMapIterator>(target));
break;
case JSSetIteratorType:
materialize(uncheckedDowncast<JSSetIterator>(target));
break;
case JSStringIteratorType:
materialize(uncheckedDowncast<JSStringIterator>(target));
break;
case JSIteratorHelperType:
materialize(uncheckedDowncast<JSIteratorHelper>(target));
break;
case JSWrapForValidIteratorType:
materialize(uncheckedDowncast<JSWrapForValidIterator>(target));
break;
case JSRegExpStringIteratorType:
materialize(uncheckedDowncast<JSRegExpStringIterator>(target));
break;
case JSGeneratorType:
materialize(uncheckedDowncast<JSGenerator>(target));
break;
case JSAsyncFunctionGeneratorType:
materialize(uncheckedDowncast<JSAsyncFunctionGenerator>(target));
break;
case JSAsyncGeneratorType:
materialize(uncheckedDowncast<JSAsyncGenerator>(target));
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
break;
}
case PhantomNewRegExp: {
RegExpObject* regExpObject = uncheckedDowncast<RegExpObject>(JSValue::decode(*encodedValue));
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() != RegExpObjectLastIndexPLoc)
continue;
regExpObject->setLastIndex(globalObject, JSValue::decode(values[i]), false /* shouldThrow */);
break;
}
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
JSC_DEFINE_NOEXCEPT_JIT_OPERATION(operationMaterializeObjectInOSR, HeapCell*, (JSGlobalObject* globalObject, ExitTimeObjectMaterialization* materialization, EncodedJSValue* values))
{
using namespace DFG;
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
// It's too hairy to handle TerminationExceptions during OSR object materialization.
// Let's just wait until after.
DeferTerminationForAWhile deferTermination(vm);
// We cannot GC. We've got pointers in evil places.
DeferGCForAWhile deferGC(vm);
switch (materialization->type()) {
case PhantomNewButterflyWithSize: {
auto scope = DECLARE_THROW_SCOPE(vm);
size_t size = UINT64_MAX;
for (unsigned i = 0; i < materialization->properties().size(); ++i) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location() != PromotedLocationDescriptor(ArrayButterflyPublicLengthPLoc))
continue;
RELEASE_ASSERT(JSValue::decode(values[i]).isInt32());
size = JSValue::decode(values[i]).asInt32();
break;
}
RELEASE_ASSERT(size < MIN_ARRAY_STORAGE_CONSTRUCTION_LENGTH);
unsigned preCapacity = 0;
unsigned propertyCapacity = 0;
IndexingHeader header;
header.setPublicLength(size);
header.setVectorLength(size);
Butterfly* result = Butterfly::tryCreate(vm, globalObject, preCapacity, propertyCapacity, true, header, size * sizeof(JSValue));
if (!result) [[unlikely]] {
throwOutOfMemoryError(globalObject, scope);
OPERATION_RETURN(scope, nullptr);
}
Butterfly::clearRange(materialization->indexingType(), result, 0, size);
return std::bit_cast<HeapCell*>(result);
}
case PhantomNewArrayWithButterfly: {
// Rematerialized butterflies are always non-ArrayStorage. However, isHavingABadTime could
// have become true between the FTL compilation and the rematerialization, which would have
// switched arrayStructureForIndexingTypeDuringAllocation to SlowPutArrayStorage for all
// indexing types. To avoid a layout mismatch, the original Array structure is used to
// rematerialize the Array initially. If we're having a bad time, the layout is switched to
// SlowPutArrayStorage below.
Structure* structure = globalObject->originalArrayStructureForIndexingType(materialization->indexingType());
Butterfly* butterfly = nullptr;
for (unsigned i = 0; i < materialization->properties().size(); ++i) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() == ArrayButterflyPLoc) {
butterfly = std::bit_cast<Butterfly*>(values[i]);
break;
}
}
RELEASE_ASSERT(butterfly);
JSArray* result = JSArray::createWithButterfly(vm, nullptr, structure, butterfly);
// The real values will be put subsequently by
// operationPopulateNewObjectInOSR. We can't fill them in
// now, because they may not be available yet (typically
// because we have a cyclic dependency graph).
// We put a dummy value here in order to avoid super-subtle
// GC-and-OSR-exit crashes in case we have a bug and some
// field is, for any reason, not filled later.
// We use a random-ish number instead of a sensible value like
// undefined to make possible bugs easier to track.
for (unsigned i = 0; i < materialization->properties().size(); ++i) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() != ArrayIndexedPropertyPLoc) {
ASSERT(property.location().kind() == ArrayButterflyPLoc);
continue;
}
unsigned index = property.location().info();
int sentinel = 0xD3137E; // delete
ASSERT(jsNumber(sentinel).isInt32());
if (hasDouble(materialization->indexingType()))
butterfly->contiguousDouble().atUnsafe(index) = static_cast<double>(sentinel);
else
butterfly->contiguous().atUnsafe(index).setStartingValue(jsNumber(sentinel));
}
if (globalObject->isHavingABadTime()) [[unlikely]] {
#if ASSERT_ENABLED
Structure* originalStructure = globalObject->arrayStructureForIndexingTypeDuringAllocation(materialization->indexingType());
ASSERT(!originalStructure || hasSlowPutArrayStorage(originalStructure->indexingType()));
#endif
result->switchToSlowPutArrayStorage(vm);
}
return result;
}
case PhantomNewObject: {
// Figure out what the structure is
Structure* structure = nullptr;
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location() != PromotedLocationDescriptor(StructurePLoc))
continue;
RELEASE_ASSERT(JSValue::decode(values[i]).asCell()->inherits<Structure>());
structure = uncheckedDowncast<Structure>(JSValue::decode(values[i]));
break;
}
RELEASE_ASSERT(structure);
JSFinalObject* result = JSFinalObject::create(vm, structure);
// The real values will be put subsequently by
// operationPopulateNewObjectInOSR. We can't fill them in
// now, because they may not be available yet (typically
// because we have a cyclic dependency graph).
// We put a dummy value here in order to avoid super-subtle
// GC-and-OSR-exit crashes in case we have a bug and some
// field is, for any reason, not filled later.
// We use a random-ish number instead of a sensible value like
// undefined to make possible bugs easier to track.
for (const PropertyTableEntry& entry : structure->getPropertiesConcurrently())
result->putDirectOffset(vm, entry.offset(), jsNumber(19723));
return result;
}
case PhantomNewFunction:
case PhantomNewGeneratorFunction:
case PhantomNewAsyncGeneratorFunction:
case PhantomNewAsyncFunction: {
// Figure out what the executable and activation are
FunctionExecutable* executable = nullptr;
JSScope* activation = nullptr;
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location() == PromotedLocationDescriptor(FunctionExecutablePLoc)) {
RELEASE_ASSERT(JSValue::decode(values[i]).asCell()->inherits<FunctionExecutable>());
executable = uncheckedDowncast<FunctionExecutable>(JSValue::decode(values[i]));
}
if (property.location() == PromotedLocationDescriptor(FunctionActivationPLoc)) {
RELEASE_ASSERT(JSValue::decode(values[i]).asCell()->inherits<JSScope>());
activation = uncheckedDowncast<JSScope>(JSValue::decode(values[i]));
}
}
RELEASE_ASSERT(executable && activation);
CodeBlock* codeBlock = baselineCodeBlockForOriginAndBaselineCodeBlock(materialization->origin(), callFrame->codeBlock()->baselineAlternative());
JSGlobalObject* globalObject = codeBlock->globalObject();
if (materialization->type() == PhantomNewFunction)
return JSFunction::createWithInvalidatedReallocationWatchpoint(vm, globalObject, executable, activation);
else if (materialization->type() == PhantomNewGeneratorFunction)
return JSGeneratorFunction::createWithInvalidatedReallocationWatchpoint(vm, globalObject, executable, activation);
else if (materialization->type() == PhantomNewAsyncGeneratorFunction)
return JSAsyncGeneratorFunction::createWithInvalidatedReallocationWatchpoint(vm, globalObject, executable, activation);
ASSERT(materialization->type() == PhantomNewAsyncFunction);
return JSAsyncFunction::createWithInvalidatedReallocationWatchpoint(vm, globalObject, executable, activation);
}
case PhantomCreateActivation: {
// Figure out what the scope and symbol table are
JSScope* scope = nullptr;
SymbolTable* table = nullptr;
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location() == PromotedLocationDescriptor(ActivationScopePLoc)) {
RELEASE_ASSERT(JSValue::decode(values[i]).asCell()->inherits<JSScope>());
scope = uncheckedDowncast<JSScope>(JSValue::decode(values[i]));
} else if (property.location() == PromotedLocationDescriptor(ActivationSymbolTablePLoc)) {
RELEASE_ASSERT(JSValue::decode(values[i]).asCell()->inherits<SymbolTable>());
table = uncheckedDowncast<SymbolTable>(JSValue::decode(values[i]));
}
}
RELEASE_ASSERT(scope);
RELEASE_ASSERT(table);
CodeBlock* codeBlock = baselineCodeBlockForOriginAndBaselineCodeBlock(
materialization->origin(), callFrame->codeBlock()->baselineAlternative());
Structure* structure = codeBlock->globalObject()->activationStructure();
// It doesn't matter what values we initialize as bottom values inside the activation constructor because
// activation sinking will set bottom values for each slot.
// FIXME: Slight optimization would be to create a constructor that doesn't initialize all slots.
JSLexicalEnvironment* result = JSLexicalEnvironment::create(vm, structure, scope, table, jsUndefined());
RELEASE_ASSERT(materialization->properties().size() - 2 == table->scopeSize());
// The real values will be put subsequently by
// operationPopulateNewObjectInOSR. See the PhantomNewObject
// case for details.
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() != ClosureVarPLoc)
continue;
result->variableAt(ScopeOffset(property.location().info())).set(
vm, result, jsNumber(29834));
}
if (validationEnabled()) {
// Validate to make sure every slot in the scope has one value.
ConcurrentJSLocker locker(table->m_lock);
for (auto iter = table->begin(locker), end = table->end(locker); iter != end; ++iter) {
bool found = false;
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() != ClosureVarPLoc)
continue;
if (ScopeOffset(property.location().info()) == iter->value.scopeOffset()) {
found = true;
break;
}
}
ASSERT_UNUSED(found, found);
}
unsigned numberOfClosureVarPloc = 0;
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() == ClosureVarPLoc)
numberOfClosureVarPloc++;
}
ASSERT_UNUSED(numberOfClosureVarPloc, numberOfClosureVarPloc == table->scopeSize());
}
return result;
}
case PhantomNewInternalFieldObject: {
// Figure out what structure.
Structure* structure = nullptr;
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location() == PromotedLocationDescriptor(StructurePLoc)) {
RELEASE_ASSERT(JSValue::decode(values[i]).asCell()->inherits<Structure>());
structure = uncheckedDowncast<Structure>(JSValue::decode(values[i]));
}
}
RELEASE_ASSERT(structure);
// The real values will be put subsequently by
// operationPopulateNewObjectInOSR. See the PhantomNewObject
// case for details.
auto create = [&]<typename T>() -> T* {
auto* result = T::createWithInitialValues(vm, structure);
RELEASE_ASSERT(materialization->properties().size() - 1 == T::numberOfInternalFields);
return result;
};
switch (structure->typeInfo().type()) {
case JSArrayIteratorType:
return create.operator()<JSArrayIterator>();
case JSMapIteratorType:
return create.operator()<JSMapIterator>();
case JSSetIteratorType:
return create.operator()<JSSetIterator>();
case JSStringIteratorType:
return create.operator()<JSStringIterator>();
case JSIteratorHelperType:
return create.operator()<JSIteratorHelper>();
case JSWrapForValidIteratorType:
return create.operator()<JSWrapForValidIterator>();
case JSRegExpStringIteratorType:
return create.operator()<JSRegExpStringIterator>();
case JSGeneratorType:
return create.operator()<JSGenerator>();
case JSAsyncFunctionGeneratorType:
return create.operator()<JSAsyncFunctionGenerator>();
case JSAsyncGeneratorType:
return create.operator()<JSAsyncGenerator>();
default:
RELEASE_ASSERT_NOT_REACHED();
return nullptr;
}
}
case PhantomNewPromise: {
Structure* structure = nullptr;
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location() == PromotedLocationDescriptor(StructurePLoc)) {
RELEASE_ASSERT(JSValue::decode(values[i]).asCell()->inherits<Structure>());
structure = uncheckedDowncast<Structure>(JSValue::decode(values[i]));
}
}
RELEASE_ASSERT(structure);
ASSERT(structure->classInfoForCells() == JSPromise::info());
return JSPromise::create(vm, structure);
}
case PhantomCreateRest:
case PhantomDirectArguments:
case PhantomClonedArguments: {
if (!materialization->origin().inlineCallFrame()) {
switch (materialization->type()) {
case PhantomDirectArguments:
return DirectArguments::createByCopying(globalObject, callFrame);
case PhantomClonedArguments: {
ClonedArguments* result = ClonedArguments::createWithMachineFrame(globalObject, callFrame, ArgumentsMode::Cloned);
RELEASE_ASSERT(result);
return result;
}
case PhantomCreateRest: {
CodeBlock* codeBlock = baselineCodeBlockForOriginAndBaselineCodeBlock(
materialization->origin(), callFrame->codeBlock()->baselineAlternative());
unsigned numberOfArgumentsToSkip = codeBlock->numberOfArgumentsToSkip();
JSGlobalObject* globalObject = codeBlock->globalObject();
Structure* structure = globalObject->restParameterStructure();
JSValue* argumentsToCopyRegion = callFrame->addressOfArgumentsStart() + numberOfArgumentsToSkip;
unsigned arraySize = callFrame->argumentCount() > numberOfArgumentsToSkip ? callFrame->argumentCount() - numberOfArgumentsToSkip : 0;
return constructArray(globalObject, structure, argumentsToCopyRegion, arraySize);
}
default:
RELEASE_ASSERT_NOT_REACHED();
return nullptr;
}
}
// First figure out the argument count. If there isn't one then we represent the machine frame.
unsigned argumentCount = 0;
if (materialization->origin().inlineCallFrame()->isVarargs()) {
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location() != PromotedLocationDescriptor(ArgumentCountPLoc))
continue;
argumentCount = JSValue::decode(values[i]).asUInt32();
break;
}
} else
argumentCount = materialization->origin().inlineCallFrame()->argumentCountIncludingThis;
RELEASE_ASSERT(argumentCount);
JSFunction* callee = nullptr;
if (materialization->origin().inlineCallFrame()->isClosureCall) {
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location() != PromotedLocationDescriptor(ArgumentsCalleePLoc))
continue;
callee = uncheckedDowncast<JSFunction>(JSValue::decode(values[i]));
break;
}
} else
callee = materialization->origin().inlineCallFrame()->calleeConstant();
RELEASE_ASSERT(callee);
CodeBlock* codeBlock = baselineCodeBlockForOriginAndBaselineCodeBlock(
materialization->origin(), callFrame->codeBlock()->baselineAlternative());
// We have an inline frame and we have all of the data we need to recreate it.
switch (materialization->type()) {
case PhantomDirectArguments: {
unsigned length = argumentCount - 1;
unsigned capacity = std::max(length, static_cast<unsigned>(codeBlock->numParameters() - 1));
DirectArguments* result = DirectArguments::create(
vm, codeBlock->globalObject()->directArgumentsStructure(), length, capacity);
result->setCallee(vm, callee);
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() != ArgumentPLoc)
continue;
unsigned index = property.location().info();
if (index >= capacity)
continue;
// We don't want to use setIndexQuickly(), since that's only for the passed-in
// arguments but sometimes the number of named arguments is greater. For
// example:
//
// function foo(a, b, c) { ... }
// foo();
//
// setIndexQuickly() would fail for indices 0, 1, 2 - but we need to recover
// those here.
result->argument(DirectArgumentsOffset(index)).set(
vm, result, JSValue::decode(values[i]));
}
return result;
}
case PhantomClonedArguments: {
unsigned length = argumentCount - 1;
JSGlobalObject* globalObject = codeBlock->globalObject();
ClonedArguments* result = ClonedArguments::createEmpty(vm, nullptr, globalObject->clonedArgumentsStructure(), callee, length, nullptr);
RELEASE_ASSERT_RESOURCE_AVAILABLE(result, MemoryExhaustion, "Crash intentionally because memory is exhausted.");
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() != ArgumentPLoc)
continue;
unsigned index = property.location().info();
if (index >= length)
continue;
result->putDirectIndex(globalObject, index, JSValue::decode(values[i]));
}
return result;
}
case PhantomCreateRest: {
unsigned numberOfArgumentsToSkip = codeBlock->numberOfArgumentsToSkip();
JSGlobalObject* globalObject = codeBlock->globalObject();
Structure* structure = globalObject->restParameterStructure();
ASSERT(argumentCount > 0);
unsigned arraySize = (argumentCount - 1) > numberOfArgumentsToSkip ? argumentCount - 1 - numberOfArgumentsToSkip : 0;
// FIXME: we should throw an out of memory error here if tryCreate() fails.
// https://bugs.webkit.org/show_bug.cgi?id=169784
JSArray* array = JSArray::tryCreate(vm, structure, arraySize);
RELEASE_ASSERT(array);
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() != ArgumentPLoc)
continue;
unsigned argIndex = property.location().info();
if (numberOfArgumentsToSkip > argIndex)
continue;
unsigned arrayIndex = argIndex - numberOfArgumentsToSkip;
if (arrayIndex >= arraySize)
continue;
array->putDirectIndex(globalObject, arrayIndex, JSValue::decode(values[i]));
}
#if ASSERT_ENABLED
// We avoid this O(n^2) loop when asserts are disabled, but the condition checked here
// must hold to ensure the correctness of the above loop because of how we allocate the array.
for (unsigned targetIndex = 0; targetIndex < arraySize; ++targetIndex) {
bool found = false;
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() != ArgumentPLoc)
continue;
unsigned argIndex = property.location().info();
if (numberOfArgumentsToSkip > argIndex)
continue;
unsigned arrayIndex = argIndex - numberOfArgumentsToSkip;
if (arrayIndex >= arraySize)
continue;
if (arrayIndex == targetIndex) {
found = true;
break;
}
}
ASSERT(found);
}
#endif // ASSERT_ENABLED
return array;
}
default:
RELEASE_ASSERT_NOT_REACHED();
return nullptr;
}
}
case PhantomSpread: {
JSArray* array = nullptr;
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() == SpreadPLoc) {
array = uncheckedDowncast<JSArray>(JSValue::decode(values[i]));
break;
}
}
RELEASE_ASSERT(array);
// Note: it is sound for JSCellButterfly::createFromArray to call getDirectIndex here
// because we're guaranteed we won't be calling any getters. The reason for this is
// that we only support PhantomSpread over CreateRest, which is an array we create.
// Any attempts to put a getter on any indices on the rest array will escape the array.
auto* fixedArray = JSCellButterfly::createFromArray(globalObject, vm, array);
RELEASE_ASSERT(fixedArray);
return fixedArray;
}
case PhantomNewArrayBuffer: {
JSCellButterfly* immutableButterfly = nullptr;
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() == NewArrayBufferPLoc) {
immutableButterfly = uncheckedDowncast<JSCellButterfly>(JSValue::decode(values[i]));
break;
}
}
RELEASE_ASSERT(immutableButterfly);
// For now, we use array allocation profile in the actual CodeBlock. It is OK since current NewArrayBuffer
// and PhantomNewArrayBuffer are always bound to a specific op_new_array_buffer.
CodeBlock* codeBlock = baselineCodeBlockForOriginAndBaselineCodeBlock(materialization->origin(), callFrame->codeBlock()->baselineAlternative());
const auto* currentInstruction = codeBlock->instructions().at(materialization->origin().bytecodeIndex()).ptr();
if (!currentInstruction->is<OpNewArrayBuffer>()) {
// This case can happen if Object.keys, an OpCall, and others is first converted into a NewArrayBuffer which is then converted into a PhantomNewArrayBuffer.
// There is no need to update the array allocation profile in that case.
Structure* structure = globalObject->arrayStructureForIndexingTypeDuringAllocation(immutableButterfly->indexingMode());
return CommonSlowPaths::allocateNewArrayBuffer(vm, structure, immutableButterfly);
}
auto newArrayBuffer = currentInstruction->as<OpNewArrayBuffer>();
ArrayAllocationProfile* profile = &newArrayBuffer.metadata(codeBlock).m_arrayAllocationProfile;
// FIXME: Share the code with CommonSlowPaths. Currently, codeBlock etc. are slightly different.
IndexingType indexingMode = profile->selectIndexingType();
Structure* structure = globalObject->arrayStructureForIndexingTypeDuringAllocation(indexingMode);
ASSERT(isCopyOnWrite(indexingMode));
ASSERT(!structure->outOfLineCapacity());
if (immutableButterfly->indexingMode() != indexingMode) [[unlikely]] {
auto* newButterfly = JSCellButterfly::create(vm, indexingMode, immutableButterfly->length());
for (unsigned i = 0; i < immutableButterfly->length(); ++i)
newButterfly->setIndex(vm, i, immutableButterfly->get(i));
immutableButterfly = newButterfly;
// FIXME: This is kinda gross and only works because we can't inline new_array_bufffer in the baseline.
// We also cannot allocate a new butterfly from compilation threads since it's invalid to allocate cells from
// a compilation thread.
WTF::storeStoreFence();
codeBlock->constantRegister(newArrayBuffer.m_immutableButterfly).set(vm, codeBlock, immutableButterfly);
WTF::storeStoreFence();
}
JSArray* result = CommonSlowPaths::allocateNewArrayBuffer(vm, structure, immutableButterfly);
ArrayAllocationProfile::updateLastAllocationFor(profile, result);
return result;
}
case PhantomNewArrayWithSpread: {
CodeBlock* codeBlock = baselineCodeBlockForOriginAndBaselineCodeBlock(
materialization->origin(), callFrame->codeBlock()->baselineAlternative());
JSGlobalObject* globalObject = codeBlock->globalObject();
Structure* structure = globalObject->arrayStructureForIndexingTypeDuringAllocation(ArrayWithContiguous);
CheckedUint32 checkedArraySize = 0;
unsigned numProperties = 0;
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() == NewArrayWithSpreadArgumentPLoc) {
++numProperties;
JSValue value = JSValue::decode(values[i]);
if (JSCellButterfly* immutableButterfly = dynamicDowncast<JSCellButterfly>(value))
checkedArraySize += immutableButterfly->publicLength();
else
checkedArraySize += 1;
}
}
// FIXME: we should throw an out of memory error here if checkedArraySize has hasOverflowed() or tryCreate() fails.
// https://bugs.webkit.org/show_bug.cgi?id=169784
unsigned arraySize = checkedArraySize; // Crashes if overflowed.
JSArray* result = JSArray::tryCreate(vm, structure, arraySize);
RELEASE_ASSERT(result);
#if ASSERT_ENABLED
// Ensure we see indices for everything in the range: [0, numProperties)
for (unsigned i = 0; i < numProperties; ++i) {
bool found = false;
for (unsigned j = 0; j < materialization->properties().size(); ++j) {
const ExitPropertyValue& property = materialization->properties()[j];
if (property.location().kind() == NewArrayWithSpreadArgumentPLoc && property.location().info() == i) {
found = true;
break;
}
}
ASSERT(found);
}
#endif // ASSERT_ENABLED
Vector<JSValue, 8> arguments;
arguments.grow(numProperties);
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location().kind() == NewArrayWithSpreadArgumentPLoc) {
JSValue value = JSValue::decode(values[i]);
RELEASE_ASSERT(property.location().info() < numProperties);
arguments[property.location().info()] = value;
}
}
unsigned arrayIndex = 0;
for (JSValue value : arguments) {
if (JSCellButterfly* immutableButterfly = dynamicDowncast<JSCellButterfly>(value)) {
for (unsigned i = 0; i < immutableButterfly->publicLength(); i++) {
ASSERT(immutableButterfly->get(i));
result->putDirectIndex(globalObject, arrayIndex, immutableButterfly->get(i));
++arrayIndex;
}
} else {
// We are not spreading.
result->putDirectIndex(globalObject, arrayIndex, value);
++arrayIndex;
}
}
return result;
}
case PhantomNewRegExp: {
RegExp* regExp = nullptr;
for (unsigned i = materialization->properties().size(); i--;) {
const ExitPropertyValue& property = materialization->properties()[i];
if (property.location() == PromotedLocationDescriptor(RegExpObjectRegExpPLoc)) {
RELEASE_ASSERT(JSValue::decode(values[i]).asCell()->inherits<RegExp>());
regExp = uncheckedDowncast<RegExp>(JSValue::decode(values[i]));
}
}
RELEASE_ASSERT(regExp);
CodeBlock* codeBlock = baselineCodeBlockForOriginAndBaselineCodeBlock(materialization->origin(), callFrame->codeBlock()->baselineAlternative());
Structure* structure = codeBlock->globalObject()->regExpStructure();
static constexpr bool areLegacyFeaturesEnabled = true;
return RegExpObject::create(vm, structure, regExp, areLegacyFeaturesEnabled);
}
default:
RELEASE_ASSERT_NOT_REACHED();
return nullptr;
}
}
JSC_DEFINE_NOEXCEPT_JIT_OPERATION(operationSwitchStringAndGetIndex, UCPUStrictInt32, (JSGlobalObject* globalObject, const UnlinkedStringJumpTable* unlinkedTable, JSString* string))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto throwScope = DECLARE_THROW_SCOPE(vm);
unsigned length = string->length();
if (length < unlinkedTable->minLength() || length > unlinkedTable->maxLength())
return toUCPUStrictInt32(std::numeric_limits<unsigned>::max());
auto str = string->value(globalObject);
RETURN_IF_EXCEPTION(throwScope, 0);
return toUCPUStrictInt32(unlinkedTable->indexForValue(str->impl(), std::numeric_limits<unsigned>::max()));
}
JSC_DEFINE_NOEXCEPT_JIT_OPERATION(operationSwitchStringResolveRopeAndGetCharacters8, const Latin1Character*, (JSGlobalObject* globalObject, JSString* string))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
// We intentionally use tryGetValue here instead of value() function not to throw OOM error.
// When failing, we will just return a nullptr, and going to the slow path.
auto value = string->tryGetValue();
StringImpl* impl = value.data.impl();
if (!impl || !impl->is8Bit())
return nullptr;
return impl->span8().data();
}
JSC_DEFINE_NOEXCEPT_JIT_OPERATION(operationTypeOfObjectAsTypeofType, UCPUStrictInt32, (JSGlobalObject* globalObject, JSCell* object))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
ASSERT(is<JSObject>(object));
if (object->structure()->masqueradesAsUndefined(globalObject))
return toUCPUStrictInt32(static_cast<int32_t>(TypeofType::Undefined));
if (object->isCallable())
return toUCPUStrictInt32(static_cast<int32_t>(TypeofType::Function));
return toUCPUStrictInt32(static_cast<int32_t>(TypeofType::Object));
}
JSC_DEFINE_NOEXCEPT_JIT_OPERATION(operationCompileFTLLazySlowPath, void*, (CallFrame* callFrame, unsigned index))
{
VM& vm = callFrame->deprecatedVM();
// Don't need an ActiveScratchBufferScope here because we DeferGCForAWhile.
// We cannot GC. We've got pointers in evil places.
DeferGCForAWhile deferGC(vm);
CodeBlock* codeBlock = callFrame->codeBlock();
JITCode* jitCode = codeBlock->jitCode()->ftl();
LazySlowPath& lazySlowPath = *jitCode->lazySlowPaths[index];
lazySlowPath.generate(codeBlock);
return lazySlowPath.stub().code().taggedPtr();
}
JSC_DEFINE_NOEXCEPT_JIT_OPERATION_WITH_ATTRIBUTES(operationReportBoundsCheckEliminationErrorAndCrash, NO_RETURN_DUE_TO_CRASH, void, (intptr_t codeBlockAsIntPtr, int32_t nodeIndex, int32_t child1Index, int32_t child2Index, int32_t checkedIndex, int32_t bounds))
{
CodeBlock* codeBlock = std::bit_cast<CodeBlock*>(codeBlockAsIntPtr);
dataLogLn("Bounds Check Eimination error found @ D@", nodeIndex, ": AssertInBounds(index D@", child1Index, ": ", checkedIndex, ", bounds D@", child2Index, " ", bounds, ") in ", codeBlock);
CRASH();
}
} } // namespace JSC::FTL
IGNORE_WARNINGS_END
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif // ENABLE(FTL_JIT)