forked from WebKit/WebKit-http
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathJITPropertyAccess.cpp
More file actions
1783 lines (1490 loc) · 67 KB
/
JITPropertyAccess.cpp
File metadata and controls
1783 lines (1490 loc) · 67 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
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Copyright (C) 2008, 2009, 2014, 2015 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"
#if ENABLE(JIT)
#include "JIT.h"
#include "CodeBlock.h"
#include "DirectArguments.h"
#include "GCAwareJITStubRoutine.h"
#include "GetterSetter.h"
#include "Interpreter.h"
#include "JITInlines.h"
#include "JSArray.h"
#include "JSEnvironmentRecord.h"
#include "JSFunction.h"
#include "LinkBuffer.h"
#include "ResultType.h"
#include "SamplingTool.h"
#include "ScopedArguments.h"
#include "ScopedArgumentsTable.h"
#include "SlowPathCall.h"
#include <wtf/StringPrintStream.h>
namespace JSC {
#if USE(JSVALUE64)
JIT::CodeRef JIT::stringGetByValStubGenerator(VM* vm)
{
JSInterfaceJIT jit(vm);
JumpList failures;
failures.append(jit.branchStructure(
NotEqual,
Address(regT0, JSCell::structureIDOffset()),
vm->stringStructure.get()));
// Load string length to regT2, and start the process of loading the data pointer into regT0
jit.load32(Address(regT0, ThunkHelpers::jsStringLengthOffset()), regT2);
jit.loadPtr(Address(regT0, ThunkHelpers::jsStringValueOffset()), regT0);
failures.append(jit.branchTest32(Zero, regT0));
// Do an unsigned compare to simultaneously filter negative indices as well as indices that are too large
failures.append(jit.branch32(AboveOrEqual, regT1, regT2));
// Load the character
JumpList is16Bit;
JumpList cont8Bit;
// Load the string flags
jit.loadPtr(Address(regT0, StringImpl::flagsOffset()), regT2);
jit.loadPtr(Address(regT0, StringImpl::dataOffset()), regT0);
is16Bit.append(jit.branchTest32(Zero, regT2, TrustedImm32(StringImpl::flagIs8Bit())));
jit.load8(BaseIndex(regT0, regT1, TimesOne, 0), regT0);
cont8Bit.append(jit.jump());
is16Bit.link(&jit);
jit.load16(BaseIndex(regT0, regT1, TimesTwo, 0), regT0);
cont8Bit.link(&jit);
failures.append(jit.branch32(AboveOrEqual, regT0, TrustedImm32(0x100)));
jit.move(TrustedImmPtr(vm->smallStrings.singleCharacterStrings()), regT1);
jit.loadPtr(BaseIndex(regT1, regT0, ScalePtr, 0), regT0);
jit.ret();
failures.link(&jit);
jit.move(TrustedImm32(0), regT0);
jit.ret();
LinkBuffer patchBuffer(*vm, jit, GLOBAL_THUNK_ID);
return FINALIZE_CODE(patchBuffer, ("String get_by_val stub"));
}
void JIT::emit_op_get_by_val(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
int property = currentInstruction[3].u.operand;
ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
ByValInfo* byValInfo = m_codeBlock->addByValInfo();
emitGetVirtualRegisters(base, regT0, property, regT1);
emitJumpSlowCaseIfNotJSCell(regT0, base);
PatchableJump notIndex = emitPatchableJumpIfNotImmediateInteger(regT1);
addSlowCase(notIndex);
// This is technically incorrect - we're zero-extending an int32. On the hot path this doesn't matter.
// We check the value as if it was a uint32 against the m_vectorLength - which will always fail if
// number was signed since m_vectorLength is always less than intmax (since the total allocation
// size is always less than 4Gb). As such zero extending will have been correct (and extending the value
// to 64-bits is necessary since it's used in the address calculation). We zero extend rather than sign
// extending since it makes it easier to re-tag the value in the slow case.
zeroExtend32ToPtr(regT1, regT1);
emitArrayProfilingSiteWithCell(regT0, regT2, profile);
and32(TrustedImm32(IndexingShapeMask), regT2);
PatchableJump badType;
JumpList slowCases;
JITArrayMode mode = chooseArrayMode(profile);
switch (mode) {
case JITInt32:
slowCases = emitInt32GetByVal(currentInstruction, badType);
break;
case JITDouble:
slowCases = emitDoubleGetByVal(currentInstruction, badType);
break;
case JITContiguous:
slowCases = emitContiguousGetByVal(currentInstruction, badType);
break;
case JITArrayStorage:
slowCases = emitArrayStorageGetByVal(currentInstruction, badType);
break;
default:
CRASH();
break;
}
addSlowCase(badType);
addSlowCase(slowCases);
Label done = label();
if (!ASSERT_DISABLED) {
Jump resultOK = branchTest64(NonZero, regT0);
abortWithReason(JITGetByValResultIsNotEmpty);
resultOK.link(this);
}
emitValueProfilingSite();
emitPutVirtualRegister(dst);
Label nextHotPath = label();
m_byValCompilationInfo.append(ByValCompilationInfo(byValInfo, m_bytecodeOffset, notIndex, badType, mode, profile, done, nextHotPath));
}
JIT::JumpList JIT::emitDoubleLoad(Instruction*, PatchableJump& badType)
{
JumpList slowCases;
badType = patchableBranch32(NotEqual, regT2, TrustedImm32(DoubleShape));
loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, Butterfly::offsetOfPublicLength())));
loadDouble(BaseIndex(regT2, regT1, TimesEight), fpRegT0);
slowCases.append(branchDouble(DoubleNotEqualOrUnordered, fpRegT0, fpRegT0));
return slowCases;
}
JIT::JumpList JIT::emitContiguousLoad(Instruction*, PatchableJump& badType, IndexingType expectedShape)
{
JumpList slowCases;
badType = patchableBranch32(NotEqual, regT2, TrustedImm32(expectedShape));
loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, Butterfly::offsetOfPublicLength())));
load64(BaseIndex(regT2, regT1, TimesEight), regT0);
slowCases.append(branchTest64(Zero, regT0));
return slowCases;
}
JIT::JumpList JIT::emitArrayStorageLoad(Instruction*, PatchableJump& badType)
{
JumpList slowCases;
add32(TrustedImm32(-ArrayStorageShape), regT2, regT3);
badType = patchableBranch32(Above, regT3, TrustedImm32(SlowPutArrayStorageShape - ArrayStorageShape));
loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, ArrayStorage::vectorLengthOffset())));
load64(BaseIndex(regT2, regT1, TimesEight, ArrayStorage::vectorOffset()), regT0);
slowCases.append(branchTest64(Zero, regT0));
return slowCases;
}
JITGetByIdGenerator JIT::emitGetByValWithCachedId(Instruction* currentInstruction, const Identifier& propertyName, Jump& fastDoneCase, Jump& slowDoneCase, JumpList& slowCases)
{
// base: regT0
// property: regT1
// scratch: regT3
int dst = currentInstruction[1].u.operand;
slowCases.append(emitJumpIfNotJSCell(regT1));
emitIdentifierCheck(regT1, regT3, propertyName, slowCases);
JITGetByIdGenerator gen(
m_codeBlock, CodeOrigin(m_bytecodeOffset), CallSiteIndex(m_bytecodeOffset), RegisterSet::stubUnavailableRegisters(),
JSValueRegs(regT0), JSValueRegs(regT0), DontSpill);
gen.generateFastPath(*this);
fastDoneCase = jump();
Label coldPathBegin = label();
gen.slowPathJump().link(this);
Call call = callOperation(WithProfile, operationGetByIdOptimize, dst, gen.stubInfo(), regT0, propertyName.impl());
gen.reportSlowPathCall(coldPathBegin, call);
slowDoneCase = jump();
return gen;
}
void JIT::emitSlow_op_get_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
int property = currentInstruction[3].u.operand;
ByValInfo* byValInfo = m_byValCompilationInfo[m_byValInstructionIndex].byValInfo;
linkSlowCaseIfNotJSCell(iter, base); // base cell check
linkSlowCase(iter); // property int32 check
Jump nonCell = jump();
linkSlowCase(iter); // base array check
Jump notString = branchStructure(NotEqual,
Address(regT0, JSCell::structureIDOffset()),
m_vm->stringStructure.get());
emitNakedCall(CodeLocationLabel(m_vm->getCTIStub(stringGetByValStubGenerator).code()));
Jump failed = branchTest64(Zero, regT0);
emitPutVirtualRegister(dst, regT0);
emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_get_by_val));
failed.link(this);
notString.link(this);
nonCell.link(this);
linkSlowCase(iter); // vector length check
linkSlowCase(iter); // empty value
Label slowPath = label();
emitGetVirtualRegister(base, regT0);
emitGetVirtualRegister(property, regT1);
Call call = callOperation(operationGetByValOptimize, dst, regT0, regT1, byValInfo);
m_byValCompilationInfo[m_byValInstructionIndex].slowPathTarget = slowPath;
m_byValCompilationInfo[m_byValInstructionIndex].returnAddress = call;
m_byValInstructionIndex++;
emitValueProfilingSite();
}
void JIT::compileGetDirectOffset(RegisterID base, RegisterID result, RegisterID offset, RegisterID scratch, FinalObjectMode finalObjectMode)
{
ASSERT(sizeof(JSValue) == 8);
if (finalObjectMode == MayBeFinal) {
Jump isInline = branch32(LessThan, offset, TrustedImm32(firstOutOfLineOffset));
loadPtr(Address(base, JSObject::butterflyOffset()), scratch);
neg32(offset);
Jump done = jump();
isInline.link(this);
addPtr(TrustedImm32(JSObject::offsetOfInlineStorage() - (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue)), base, scratch);
done.link(this);
} else {
if (!ASSERT_DISABLED) {
Jump isOutOfLine = branch32(GreaterThanOrEqual, offset, TrustedImm32(firstOutOfLineOffset));
abortWithReason(JITOffsetIsNotOutOfLine);
isOutOfLine.link(this);
}
loadPtr(Address(base, JSObject::butterflyOffset()), scratch);
neg32(offset);
}
signExtend32ToPtr(offset, offset);
load64(BaseIndex(scratch, offset, TimesEight, (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue)), result);
}
void JIT::emit_op_put_by_val(Instruction* currentInstruction)
{
int base = currentInstruction[1].u.operand;
int property = currentInstruction[2].u.operand;
ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
ByValInfo* byValInfo = m_codeBlock->addByValInfo();
emitGetVirtualRegisters(base, regT0, property, regT1);
emitJumpSlowCaseIfNotJSCell(regT0, base);
PatchableJump notIndex = emitPatchableJumpIfNotImmediateInteger(regT1);
addSlowCase(notIndex);
// See comment in op_get_by_val.
zeroExtend32ToPtr(regT1, regT1);
emitArrayProfilingSiteWithCell(regT0, regT2, profile);
and32(TrustedImm32(IndexingShapeMask), regT2);
PatchableJump badType;
JumpList slowCases;
JITArrayMode mode = chooseArrayMode(profile);
switch (mode) {
case JITInt32:
slowCases = emitInt32PutByVal(currentInstruction, badType);
break;
case JITDouble:
slowCases = emitDoublePutByVal(currentInstruction, badType);
break;
case JITContiguous:
slowCases = emitContiguousPutByVal(currentInstruction, badType);
break;
case JITArrayStorage:
slowCases = emitArrayStoragePutByVal(currentInstruction, badType);
break;
default:
CRASH();
break;
}
addSlowCase(badType);
addSlowCase(slowCases);
Label done = label();
m_byValCompilationInfo.append(ByValCompilationInfo(byValInfo, m_bytecodeOffset, notIndex, badType, mode, profile, done, done));
}
JIT::JumpList JIT::emitGenericContiguousPutByVal(Instruction* currentInstruction, PatchableJump& badType, IndexingType indexingShape)
{
int value = currentInstruction[3].u.operand;
ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
JumpList slowCases;
badType = patchableBranch32(NotEqual, regT2, TrustedImm32(indexingShape));
loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
Jump outOfBounds = branch32(AboveOrEqual, regT1, Address(regT2, Butterfly::offsetOfPublicLength()));
Label storeResult = label();
emitGetVirtualRegister(value, regT3);
switch (indexingShape) {
case Int32Shape:
slowCases.append(emitJumpIfNotImmediateInteger(regT3));
store64(regT3, BaseIndex(regT2, regT1, TimesEight));
break;
case DoubleShape: {
Jump notInt = emitJumpIfNotImmediateInteger(regT3);
convertInt32ToDouble(regT3, fpRegT0);
Jump ready = jump();
notInt.link(this);
add64(tagTypeNumberRegister, regT3);
move64ToDouble(regT3, fpRegT0);
slowCases.append(branchDouble(DoubleNotEqualOrUnordered, fpRegT0, fpRegT0));
ready.link(this);
storeDouble(fpRegT0, BaseIndex(regT2, regT1, TimesEight));
break;
}
case ContiguousShape:
store64(regT3, BaseIndex(regT2, regT1, TimesEight));
emitWriteBarrier(currentInstruction[1].u.operand, value, ShouldFilterValue);
break;
default:
CRASH();
break;
}
Jump done = jump();
outOfBounds.link(this);
slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, Butterfly::offsetOfVectorLength())));
emitArrayProfileStoreToHoleSpecialCase(profile);
add32(TrustedImm32(1), regT1, regT3);
store32(regT3, Address(regT2, Butterfly::offsetOfPublicLength()));
jump().linkTo(storeResult, this);
done.link(this);
return slowCases;
}
JIT::JumpList JIT::emitArrayStoragePutByVal(Instruction* currentInstruction, PatchableJump& badType)
{
int value = currentInstruction[3].u.operand;
ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
JumpList slowCases;
badType = patchableBranch32(NotEqual, regT2, TrustedImm32(ArrayStorageShape));
loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, ArrayStorage::vectorLengthOffset())));
Jump empty = branchTest64(Zero, BaseIndex(regT2, regT1, TimesEight, OBJECT_OFFSETOF(ArrayStorage, m_vector[0])));
Label storeResult(this);
emitGetVirtualRegister(value, regT3);
store64(regT3, BaseIndex(regT2, regT1, TimesEight, OBJECT_OFFSETOF(ArrayStorage, m_vector[0])));
emitWriteBarrier(currentInstruction[1].u.operand, value, ShouldFilterValue);
Jump end = jump();
empty.link(this);
emitArrayProfileStoreToHoleSpecialCase(profile);
add32(TrustedImm32(1), Address(regT2, ArrayStorage::numValuesInVectorOffset()));
branch32(Below, regT1, Address(regT2, ArrayStorage::lengthOffset())).linkTo(storeResult, this);
add32(TrustedImm32(1), regT1);
store32(regT1, Address(regT2, ArrayStorage::lengthOffset()));
sub32(TrustedImm32(1), regT1);
jump().linkTo(storeResult, this);
end.link(this);
return slowCases;
}
JITPutByIdGenerator JIT::emitPutByValWithCachedId(Instruction* currentInstruction, PutKind putKind, const Identifier& propertyName, JumpList& doneCases, JumpList& slowCases)
{
// base: regT0
// property: regT1
// scratch: regT2
int base = currentInstruction[1].u.operand;
int value = currentInstruction[3].u.operand;
slowCases.append(emitJumpIfNotJSCell(regT1));
emitIdentifierCheck(regT1, regT1, propertyName, slowCases);
// Write barrier breaks the registers. So after issuing the write barrier,
// reload the registers.
emitWriteBarrier(base, value, ShouldFilterValue);
emitGetVirtualRegisters(base, regT0, value, regT1);
JITPutByIdGenerator gen(
m_codeBlock, CodeOrigin(m_bytecodeOffset), CallSiteIndex(m_bytecodeOffset), RegisterSet::stubUnavailableRegisters(),
JSValueRegs(regT0), JSValueRegs(regT1), regT2, DontSpill, m_codeBlock->ecmaMode(), putKind);
gen.generateFastPath(*this);
doneCases.append(jump());
Label coldPathBegin = label();
gen.slowPathJump().link(this);
Call call = callOperation(gen.slowPathFunction(), gen.stubInfo(), regT1, regT0, propertyName.impl());
gen.reportSlowPathCall(coldPathBegin, call);
doneCases.append(jump());
return gen;
}
void JIT::emitSlow_op_put_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int base = currentInstruction[1].u.operand;
int property = currentInstruction[2].u.operand;
int value = currentInstruction[3].u.operand;
ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
ByValInfo* byValInfo = m_byValCompilationInfo[m_byValInstructionIndex].byValInfo;
linkSlowCaseIfNotJSCell(iter, base); // base cell check
linkSlowCase(iter); // property int32 check
linkSlowCase(iter); // base not array check
JITArrayMode mode = chooseArrayMode(profile);
switch (mode) {
case JITInt32:
case JITDouble:
linkSlowCase(iter); // value type check
break;
default:
break;
}
Jump skipProfiling = jump();
linkSlowCase(iter); // out of bounds
emitArrayProfileOutOfBoundsSpecialCase(profile);
skipProfiling.link(this);
Label slowPath = label();
emitGetVirtualRegister(base, regT0);
emitGetVirtualRegister(property, regT1);
emitGetVirtualRegister(value, regT2);
bool isDirect = m_interpreter->getOpcodeID(currentInstruction->u.opcode) == op_put_by_val_direct;
Call call = callOperation(isDirect ? operationDirectPutByValOptimize : operationPutByValOptimize, regT0, regT1, regT2, byValInfo);
m_byValCompilationInfo[m_byValInstructionIndex].slowPathTarget = slowPath;
m_byValCompilationInfo[m_byValInstructionIndex].returnAddress = call;
m_byValInstructionIndex++;
}
void JIT::emit_op_put_by_index(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
emitGetVirtualRegister(currentInstruction[3].u.operand, regT1);
callOperation(operationPutByIndex, regT0, currentInstruction[2].u.operand, regT1);
}
void JIT::emit_op_put_getter_by_id(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
int32_t options = currentInstruction[3].u.operand;
emitGetVirtualRegister(currentInstruction[4].u.operand, regT1);
callOperation(operationPutGetterById, regT0, &m_codeBlock->identifier(currentInstruction[2].u.operand), options, regT1);
}
void JIT::emit_op_put_setter_by_id(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
int32_t options = currentInstruction[3].u.operand;
emitGetVirtualRegister(currentInstruction[4].u.operand, regT1);
callOperation(operationPutSetterById, regT0, &m_codeBlock->identifier(currentInstruction[2].u.operand), options, regT1);
}
void JIT::emit_op_put_getter_setter(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
int32_t attribute = currentInstruction[3].u.operand;
emitGetVirtualRegister(currentInstruction[4].u.operand, regT1);
emitGetVirtualRegister(currentInstruction[5].u.operand, regT2);
callOperation(operationPutGetterSetter, regT0, &m_codeBlock->identifier(currentInstruction[2].u.operand), attribute, regT1, regT2);
}
void JIT::emit_op_put_getter_by_val(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
emitGetVirtualRegister(currentInstruction[2].u.operand, regT1);
int32_t attributes = currentInstruction[3].u.operand;
emitGetVirtualRegister(currentInstruction[4].u.operand, regT2);
callOperation(operationPutGetterByVal, regT0, regT1, attributes, regT2);
}
void JIT::emit_op_put_setter_by_val(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
emitGetVirtualRegister(currentInstruction[2].u.operand, regT1);
int32_t attributes = currentInstruction[3].u.operand;
emitGetVirtualRegister(currentInstruction[4].u.operand, regT2);
callOperation(operationPutSetterByVal, regT0, regT1, attributes, regT2);
}
void JIT::emit_op_del_by_id(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
int property = currentInstruction[3].u.operand;
emitGetVirtualRegister(base, regT0);
callOperation(operationDeleteById, dst, regT0, &m_codeBlock->identifier(property));
}
void JIT::emit_op_get_by_id(Instruction* currentInstruction)
{
int resultVReg = currentInstruction[1].u.operand;
int baseVReg = currentInstruction[2].u.operand;
const Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
emitGetVirtualRegister(baseVReg, regT0);
emitJumpSlowCaseIfNotJSCell(regT0, baseVReg);
if (*ident == m_vm->propertyNames->length && shouldEmitProfiling())
emitArrayProfilingSiteForBytecodeIndexWithCell(regT0, regT1, m_bytecodeOffset);
JITGetByIdGenerator gen(
m_codeBlock, CodeOrigin(m_bytecodeOffset), CallSiteIndex(m_bytecodeOffset), RegisterSet::stubUnavailableRegisters(),
JSValueRegs(regT0), JSValueRegs(regT0), DontSpill);
gen.generateFastPath(*this);
addSlowCase(gen.slowPathJump());
m_getByIds.append(gen);
emitValueProfilingSite();
emitPutVirtualRegister(resultVReg);
assertStackPointerOffset();
}
void JIT::emitSlow_op_get_by_id(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int resultVReg = currentInstruction[1].u.operand;
int baseVReg = currentInstruction[2].u.operand;
const Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
linkSlowCaseIfNotJSCell(iter, baseVReg);
linkSlowCase(iter);
JITGetByIdGenerator& gen = m_getByIds[m_getByIdIndex++];
Label coldPathBegin = label();
Call call = callOperation(WithProfile, operationGetByIdOptimize, resultVReg, gen.stubInfo(), regT0, ident->impl());
gen.reportSlowPathCall(coldPathBegin, call);
}
void JIT::emit_op_put_by_id(Instruction* currentInstruction)
{
int baseVReg = currentInstruction[1].u.operand;
int valueVReg = currentInstruction[3].u.operand;
unsigned direct = currentInstruction[8].u.putByIdFlags & PutByIdIsDirect;
emitWriteBarrier(baseVReg, valueVReg, ShouldFilterBase);
// In order to be able to patch both the Structure, and the object offset, we store one pointer,
// to just after the arguments have been loaded into registers 'hotPathBegin', and we generate code
// such that the Structure & offset are always at the same distance from this.
emitGetVirtualRegisters(baseVReg, regT0, valueVReg, regT1);
// Jump to a slow case if either the base object is an immediate, or if the Structure does not match.
emitJumpSlowCaseIfNotJSCell(regT0, baseVReg);
JITPutByIdGenerator gen(
m_codeBlock, CodeOrigin(m_bytecodeOffset), CallSiteIndex(m_bytecodeOffset), RegisterSet::stubUnavailableRegisters(),
JSValueRegs(regT0), JSValueRegs(regT1), regT2, DontSpill, m_codeBlock->ecmaMode(),
direct ? Direct : NotDirect);
gen.generateFastPath(*this);
addSlowCase(gen.slowPathJump());
m_putByIds.append(gen);
}
void JIT::emitSlow_op_put_by_id(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int baseVReg = currentInstruction[1].u.operand;
const Identifier* ident = &(m_codeBlock->identifier(currentInstruction[2].u.operand));
linkSlowCaseIfNotJSCell(iter, baseVReg);
linkSlowCase(iter);
Label coldPathBegin(this);
JITPutByIdGenerator& gen = m_putByIds[m_putByIdIndex++];
Call call = callOperation(
gen.slowPathFunction(), gen.stubInfo(), regT1, regT0, ident->impl());
gen.reportSlowPathCall(coldPathBegin, call);
}
// Compile a store into an object's property storage. May overwrite the
// value in objectReg.
void JIT::compilePutDirectOffset(RegisterID base, RegisterID value, PropertyOffset cachedOffset)
{
if (isInlineOffset(cachedOffset)) {
store64(value, Address(base, JSObject::offsetOfInlineStorage() + sizeof(JSValue) * offsetInInlineStorage(cachedOffset)));
return;
}
loadPtr(Address(base, JSObject::butterflyOffset()), base);
store64(value, Address(base, sizeof(JSValue) * offsetInButterfly(cachedOffset)));
}
// Compile a load from an object's property storage. May overwrite base.
void JIT::compileGetDirectOffset(RegisterID base, RegisterID result, PropertyOffset cachedOffset)
{
if (isInlineOffset(cachedOffset)) {
load64(Address(base, JSObject::offsetOfInlineStorage() + sizeof(JSValue) * offsetInInlineStorage(cachedOffset)), result);
return;
}
loadPtr(Address(base, JSObject::butterflyOffset()), result);
load64(Address(result, sizeof(JSValue) * offsetInButterfly(cachedOffset)), result);
}
void JIT::compileGetDirectOffset(JSObject* base, RegisterID result, PropertyOffset cachedOffset)
{
if (isInlineOffset(cachedOffset)) {
load64(base->locationForOffset(cachedOffset), result);
return;
}
loadPtr(base->butterflyAddress(), result);
load64(Address(result, offsetInButterfly(cachedOffset) * sizeof(WriteBarrier<Unknown>)), result);
}
void JIT::emitVarInjectionCheck(bool needsVarInjectionChecks)
{
if (!needsVarInjectionChecks)
return;
addSlowCase(branch8(Equal, AbsoluteAddress(m_codeBlock->globalObject()->varInjectionWatchpoint()->addressOfState()), TrustedImm32(IsInvalidated)));
}
void JIT::emitResolveClosure(int dst, int scope, bool needsVarInjectionChecks, unsigned depth)
{
emitVarInjectionCheck(needsVarInjectionChecks);
emitGetVirtualRegister(scope, regT0);
for (unsigned i = 0; i < depth; ++i)
loadPtr(Address(regT0, JSScope::offsetOfNext()), regT0);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_resolve_scope(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int scope = currentInstruction[2].u.operand;
ResolveType resolveType = static_cast<ResolveType>(currentInstruction[4].u.operand);
unsigned depth = currentInstruction[5].u.operand;
auto emitCode = [&] (ResolveType resolveType) {
switch (resolveType) {
case GlobalProperty:
case GlobalVar:
case GlobalPropertyWithVarInjectionChecks:
case GlobalVarWithVarInjectionChecks:
case GlobalLexicalVar:
case GlobalLexicalVarWithVarInjectionChecks: {
JSScope* constantScope = JSScope::constantScopeForCodeBlock(resolveType, m_codeBlock);
RELEASE_ASSERT(constantScope);
emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
move(TrustedImmPtr(constantScope), regT0);
emitPutVirtualRegister(dst);
break;
}
case ClosureVar:
case ClosureVarWithVarInjectionChecks:
emitResolveClosure(dst, scope, needsVarInjectionChecks(resolveType), depth);
break;
case ModuleVar:
move(TrustedImmPtr(currentInstruction[6].u.jsCell.get()), regT0);
emitPutVirtualRegister(dst);
break;
case Dynamic:
addSlowCase(jump());
break;
case LocalClosureVar:
case UnresolvedProperty:
case UnresolvedPropertyWithVarInjectionChecks:
RELEASE_ASSERT_NOT_REACHED();
}
};
switch (resolveType) {
case UnresolvedProperty:
case UnresolvedPropertyWithVarInjectionChecks: {
JumpList skipToEnd;
load32(¤tInstruction[4], regT0);
Jump notGlobalProperty = branch32(NotEqual, regT0, TrustedImm32(GlobalProperty));
emitCode(GlobalProperty);
skipToEnd.append(jump());
notGlobalProperty.link(this);
Jump notGlobalPropertyWithVarInjections = branch32(NotEqual, regT0, TrustedImm32(GlobalPropertyWithVarInjectionChecks));
emitCode(GlobalPropertyWithVarInjectionChecks);
skipToEnd.append(jump());
notGlobalPropertyWithVarInjections.link(this);
Jump notGlobalLexicalVar = branch32(NotEqual, regT0, TrustedImm32(GlobalLexicalVar));
emitCode(GlobalLexicalVar);
skipToEnd.append(jump());
notGlobalLexicalVar.link(this);
Jump notGlobalLexicalVarWithVarInjections = branch32(NotEqual, regT0, TrustedImm32(GlobalLexicalVarWithVarInjectionChecks));
emitCode(GlobalLexicalVarWithVarInjectionChecks);
skipToEnd.append(jump());
notGlobalLexicalVarWithVarInjections.link(this);
addSlowCase(jump());
skipToEnd.link(this);
break;
}
default:
emitCode(resolveType);
break;
}
}
void JIT::emitSlow_op_resolve_scope(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
ResolveType resolveType = static_cast<ResolveType>(currentInstruction[4].u.operand);
if (resolveType == GlobalProperty || resolveType == GlobalVar || resolveType == ClosureVar || resolveType == GlobalLexicalVar || resolveType == ModuleVar)
return;
if (resolveType == UnresolvedProperty || resolveType == UnresolvedPropertyWithVarInjectionChecks) {
linkSlowCase(iter); // var injections check for GlobalPropertyWithVarInjectionChecks.
linkSlowCase(iter); // var injections check for GlobalLexicalVarWithVarInjectionChecks.
}
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_resolve_scope);
slowPathCall.call();
}
void JIT::emitLoadWithStructureCheck(int scope, Structure** structureSlot)
{
emitGetVirtualRegister(scope, regT0);
loadPtr(structureSlot, regT1);
addSlowCase(branchTestPtr(Zero, regT1));
load32(Address(regT1, Structure::structureIDOffset()), regT1);
addSlowCase(branch32(NotEqual, Address(regT0, JSCell::structureIDOffset()), regT1));
}
void JIT::emitGetGlobalProperty(uintptr_t* operandSlot)
{
load32(operandSlot, regT1);
compileGetDirectOffset(regT0, regT0, regT1, regT2, KnownNotFinal);
}
void JIT::emitGetVarFromPointer(JSValue* operand, GPRReg reg)
{
loadPtr(operand, reg);
}
void JIT::emitGetVarFromIndirectPointer(JSValue** operand, GPRReg reg)
{
loadPtr(operand, reg);
loadPtr(reg, reg);
}
void JIT::emitGetClosureVar(int scope, uintptr_t operand)
{
emitGetVirtualRegister(scope, regT0);
loadPtr(Address(regT0, JSEnvironmentRecord::offsetOfVariables() + operand * sizeof(Register)), regT0);
}
void JIT::emit_op_get_from_scope(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int scope = currentInstruction[2].u.operand;
ResolveType resolveType = GetPutInfo(currentInstruction[4].u.operand).resolveType();
Structure** structureSlot = currentInstruction[5].u.structure.slot();
uintptr_t* operandSlot = reinterpret_cast<uintptr_t*>(¤tInstruction[6].u.pointer);
auto emitCode = [&] (ResolveType resolveType, bool indirectLoadForOperand) {
switch (resolveType) {
case GlobalProperty:
case GlobalPropertyWithVarInjectionChecks:
emitLoadWithStructureCheck(scope, structureSlot); // Structure check covers var injection.
emitGetGlobalProperty(operandSlot);
break;
case GlobalVar:
case GlobalVarWithVarInjectionChecks:
case GlobalLexicalVar:
case GlobalLexicalVarWithVarInjectionChecks:
emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
if (indirectLoadForOperand)
emitGetVarFromIndirectPointer(bitwise_cast<JSValue**>(operandSlot), regT0);
else
emitGetVarFromPointer(bitwise_cast<JSValue*>(*operandSlot), regT0);
if (resolveType == GlobalLexicalVar || resolveType == GlobalLexicalVarWithVarInjectionChecks) // TDZ check.
addSlowCase(branchTest64(Zero, regT0));
break;
case ClosureVar:
case ClosureVarWithVarInjectionChecks:
emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
emitGetClosureVar(scope, *operandSlot);
break;
case Dynamic:
addSlowCase(jump());
break;
case LocalClosureVar:
case ModuleVar:
case UnresolvedProperty:
case UnresolvedPropertyWithVarInjectionChecks:
RELEASE_ASSERT_NOT_REACHED();
}
};
switch (resolveType) {
case UnresolvedProperty:
case UnresolvedPropertyWithVarInjectionChecks: {
JumpList skipToEnd;
load32(¤tInstruction[4], regT0);
and32(TrustedImm32(GetPutInfo::typeBits), regT0); // Load ResolveType into T0
Jump isGlobalProperty = branch32(Equal, regT0, TrustedImm32(GlobalProperty));
Jump notGlobalPropertyWithVarInjections = branch32(NotEqual, regT0, TrustedImm32(GlobalPropertyWithVarInjectionChecks));
isGlobalProperty.link(this);
emitCode(GlobalProperty, false);
skipToEnd.append(jump());
notGlobalPropertyWithVarInjections.link(this);
Jump notGlobalLexicalVar = branch32(NotEqual, regT0, TrustedImm32(GlobalLexicalVar));
emitCode(GlobalLexicalVar, true);
skipToEnd.append(jump());
notGlobalLexicalVar.link(this);
Jump notGlobalLexicalVarWithVarInjections = branch32(NotEqual, regT0, TrustedImm32(GlobalLexicalVarWithVarInjectionChecks));
emitCode(GlobalLexicalVarWithVarInjectionChecks, true);
skipToEnd.append(jump());
notGlobalLexicalVarWithVarInjections.link(this);
addSlowCase(jump());
skipToEnd.link(this);
break;
}
default:
emitCode(resolveType, false);
break;
}
emitPutVirtualRegister(dst);
emitValueProfilingSite();
}
void JIT::emitSlow_op_get_from_scope(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
ResolveType resolveType = GetPutInfo(currentInstruction[4].u.operand).resolveType();
if (resolveType == GlobalVar || resolveType == ClosureVar)
return;
if (resolveType == GlobalProperty || resolveType == GlobalPropertyWithVarInjectionChecks)
linkSlowCase(iter);
if (resolveType == GlobalLexicalVarWithVarInjectionChecks) // Var injections check.
linkSlowCase(iter);
if (resolveType == UnresolvedProperty || resolveType == UnresolvedPropertyWithVarInjectionChecks) {
// GlobalProperty/GlobalPropertyWithVarInjectionChecks
linkSlowCase(iter); // emitLoadWithStructureCheck
linkSlowCase(iter); // emitLoadWithStructureCheck
// GlobalLexicalVar
linkSlowCase(iter); // TDZ check.
// GlobalLexicalVarWithVarInjectionChecks.
linkSlowCase(iter); // var injection check.
linkSlowCase(iter); // TDZ check.
}
linkSlowCase(iter);
callOperation(WithProfile, operationGetFromScope, dst, currentInstruction);
}
void JIT::emitPutGlobalProperty(uintptr_t* operandSlot, int value)
{
emitGetVirtualRegister(value, regT2);
loadPtr(Address(regT0, JSObject::butterflyOffset()), regT0);
loadPtr(operandSlot, regT1);
negPtr(regT1);
storePtr(regT2, BaseIndex(regT0, regT1, TimesEight, (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue)));
}
void JIT::emitPutGlobalVariable(JSValue* operand, int value, WatchpointSet* set)
{
emitGetVirtualRegister(value, regT0);
emitNotifyWrite(set);
storePtr(regT0, operand);
}
void JIT::emitPutGlobalVariableIndirect(JSValue** addressOfOperand, int value, WatchpointSet** indirectWatchpointSet)
{
emitGetVirtualRegister(value, regT0);
loadPtr(indirectWatchpointSet, regT1);
emitNotifyWrite(regT1);
loadPtr(addressOfOperand, regT1);
storePtr(regT0, regT1);
}
void JIT::emitPutClosureVar(int scope, uintptr_t operand, int value, WatchpointSet* set)
{
emitGetVirtualRegister(value, regT1);
emitGetVirtualRegister(scope, regT0);
emitNotifyWrite(set);
storePtr(regT1, Address(regT0, JSEnvironmentRecord::offsetOfVariables() + operand * sizeof(Register)));
}
void JIT::emit_op_put_to_scope(Instruction* currentInstruction)
{
int scope = currentInstruction[1].u.operand;
int value = currentInstruction[3].u.operand;
GetPutInfo getPutInfo = GetPutInfo(currentInstruction[4].u.operand);
ResolveType resolveType = getPutInfo.resolveType();
Structure** structureSlot = currentInstruction[5].u.structure.slot();
uintptr_t* operandSlot = reinterpret_cast<uintptr_t*>(¤tInstruction[6].u.pointer);
auto emitCode = [&] (ResolveType resolveType, bool indirectLoadForOperand) {
switch (resolveType) {
case GlobalProperty:
case GlobalPropertyWithVarInjectionChecks:
emitWriteBarrier(m_codeBlock->globalObject(), value, ShouldFilterValue);
emitLoadWithStructureCheck(scope, structureSlot); // Structure check covers var injection.
emitPutGlobalProperty(operandSlot, value);
break;
case GlobalVar:
case GlobalVarWithVarInjectionChecks:
case GlobalLexicalVar:
case GlobalLexicalVarWithVarInjectionChecks: {
JSScope* constantScope = JSScope::constantScopeForCodeBlock(resolveType, m_codeBlock);
RELEASE_ASSERT(constantScope);
emitWriteBarrier(constantScope, value, ShouldFilterValue);
emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
if (getPutInfo.initializationMode() != Initialization && (resolveType == GlobalLexicalVar || resolveType == GlobalLexicalVarWithVarInjectionChecks)) {
// We need to do a TDZ check here because we can't always prove we need to emit TDZ checks statically.
if (indirectLoadForOperand)