This repository was archived by the owner on Jun 24, 2022. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 2k
Expand file tree
/
Copy pathLLIntSlowPaths.cpp
More file actions
2424 lines (2029 loc) · 92.6 KB
/
LLIntSlowPaths.cpp
File metadata and controls
2424 lines (2029 loc) · 92.6 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) 2011-2020 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 "LLIntSlowPaths.h"
#include "ArrayConstructor.h"
#include "BytecodeGenerator.h"
#include "BytecodeOperandsForCheckpoint.h"
#include "CallFrame.h"
#include "CheckpointOSRExitSideState.h"
#include "CommonSlowPathsInlines.h"
#include "Error.h"
#include "ErrorHandlingScope.h"
#include "Exception.h"
#include "ExceptionFuzz.h"
#include "FrameTracers.h"
#include "FunctionAllowlist.h"
#include "FunctionCodeBlock.h"
#include "GetterSetter.h"
#include "JITExceptions.h"
#include "JITWorklist.h"
#include "JSAsyncFunction.h"
#include "JSAsyncGeneratorFunction.h"
#include "JSCInlines.h"
#include "JSCJSValue.h"
#include "JSGeneratorFunction.h"
#include "JSGlobalObjectFunctions.h"
#include "JSLexicalEnvironment.h"
#include "JSString.h"
#include "LLIntCommon.h"
#include "LLIntData.h"
#include "LLIntEntrypoint.h"
#include "LLIntExceptions.h"
#include "LLIntPrototypeLoadAdaptiveStructureWatchpoint.h"
#include "ObjectConstructor.h"
#include "ObjectPropertyConditionSet.h"
#include "ProtoCallFrameInlines.h"
#include "RegExpObject.h"
#include "ShadowChicken.h"
#include "SuperSampler.h"
#include "VMInlines.h"
#include <wtf/NeverDestroyed.h>
#include <wtf/StringPrintStream.h>
namespace JSC { namespace LLInt {
#define LLINT_BEGIN_NO_SET_PC() \
CodeBlock* codeBlock = callFrame->codeBlock(); \
JSGlobalObject* globalObject = codeBlock->globalObject(); \
VM& vm = codeBlock->vm(); \
SlowPathFrameTracer tracer(vm, callFrame); \
dataLogLnIf(LLINT_TRACING && Options::traceLLIntSlowPath(), "Calling slow path ", WTF_PRETTY_FUNCTION); \
auto throwScope = DECLARE_THROW_SCOPE(vm)
#ifndef NDEBUG
#define LLINT_SET_PC_FOR_STUBS() do { \
codeBlock->bytecodeOffset(pc); \
callFrame->setCurrentVPC(pc); \
} while (false)
#else
#define LLINT_SET_PC_FOR_STUBS() do { \
callFrame->setCurrentVPC(pc); \
} while (false)
#endif
#define LLINT_BEGIN() \
LLINT_BEGIN_NO_SET_PC(); \
LLINT_SET_PC_FOR_STUBS()
inline JSValue getNonConstantOperand(CallFrame* callFrame, VirtualRegister operand) { return callFrame->uncheckedR(operand).jsValue(); }
inline JSValue getOperand(CallFrame* callFrame, VirtualRegister operand) { return callFrame->r(operand).jsValue(); }
#define LLINT_RETURN_TWO(first, second) do { \
return encodeResult(first, second); \
} while (false)
#define LLINT_END_IMPL() LLINT_RETURN_TWO(pc, nullptr)
#define LLINT_THROW(exceptionToThrow) do { \
throwException(globalObject, throwScope, exceptionToThrow); \
pc = returnToThrow(vm); \
LLINT_END_IMPL(); \
} while (false)
#define LLINT_CHECK_EXCEPTION() do { \
doExceptionFuzzingIfEnabled(globalObject, throwScope, "LLIntSlowPaths", pc); \
if (UNLIKELY(throwScope.exception())) { \
pc = returnToThrow(vm); \
LLINT_END_IMPL(); \
} \
} while (false)
#define LLINT_END() do { \
LLINT_CHECK_EXCEPTION(); \
LLINT_END_IMPL(); \
} while (false)
#define JUMP_OFFSET(targetOffset) \
((targetOffset) ? (targetOffset) : codeBlock->outOfLineJumpOffset(pc))
#define JUMP_TO(target) do { \
pc = reinterpret_cast<const Instruction*>(reinterpret_cast<const uint8_t*>(pc) + (target)); \
} while (false)
#define LLINT_BRANCH(condition) do { \
bool __b_condition = (condition); \
LLINT_CHECK_EXCEPTION(); \
if (__b_condition) \
JUMP_TO(JUMP_OFFSET(bytecode.m_targetLabel)); \
else \
JUMP_TO(pc->size()); \
LLINT_END_IMPL(); \
} while (false)
#define LLINT_RETURN(value) do { \
JSValue __r_returnValue = (value); \
LLINT_CHECK_EXCEPTION(); \
callFrame->uncheckedR(bytecode.m_dst) = __r_returnValue; \
LLINT_END_IMPL(); \
} while (false)
#define LLINT_RETURN_PROFILED(value) do { \
JSValue __rp_returnValue = (value); \
LLINT_CHECK_EXCEPTION(); \
callFrame->uncheckedR(bytecode.m_dst) = __rp_returnValue; \
LLINT_PROFILE_VALUE(__rp_returnValue); \
LLINT_END_IMPL(); \
} while (false)
#define LLINT_PROFILE_VALUE(value) do { \
bytecode.metadata(codeBlock).m_profile.m_buckets[0] = JSValue::encode(value); \
} while (false)
#define LLINT_CALL_END_IMPL(callFrame, callTarget, callTargetTag) \
LLINT_RETURN_TWO((retagCodePtr<callTargetTag, SlowPathPtrTag>(callTarget)), (callFrame))
#define LLINT_CALL_THROW(globalObject, exceptionToThrow) do { \
JSGlobalObject* __ct_globalObject = (globalObject); \
throwException(__ct_globalObject, throwScope, exceptionToThrow); \
LLINT_CALL_END_IMPL(nullptr, callToThrow(vm).code().executableAddress(), ExceptionHandlerPtrTag); \
} while (false)
#define LLINT_CALL_CHECK_EXCEPTION(globalObject) do { \
JSGlobalObject* __cce_globalObject = (globalObject); \
doExceptionFuzzingIfEnabled(__cce_globalObject, throwScope, "LLIntSlowPaths/call", nullptr); \
if (UNLIKELY(throwScope.exception())) \
LLINT_CALL_END_IMPL(nullptr, callToThrow(vm).code().executableAddress(), ExceptionHandlerPtrTag); \
} while (false)
#define LLINT_CALL_RETURN(globalObject, calleeFrame, callTarget, callTargetTag) do { \
JSGlobalObject* __cr_globalObject = (globalObject); \
CallFrame* __cr_calleeFrame = (calleeFrame); \
void* __cr_callTarget = (callTarget); \
LLINT_CALL_CHECK_EXCEPTION(__cr_globalObject); \
LLINT_CALL_END_IMPL(__cr_calleeFrame, __cr_callTarget, callTargetTag); \
} while (false)
#define LLINT_RETURN_CALLEE_FRAME(calleeFrame) do { \
CallFrame* __rcf_calleeFrame = (calleeFrame); \
LLINT_RETURN_TWO(pc, __rcf_calleeFrame); \
} while (false)
#if LLINT_TRACING
template<typename... Types>
void slowPathLog(const Types&... values)
{
dataLogIf(Options::traceLLIntSlowPath(), values...);
}
template<typename... Types>
void slowPathLn(const Types&... values)
{
dataLogLnIf(Options::traceLLIntSlowPath(), values...);
}
template<typename... Types>
void slowPathLogF(const char* format, const Types&... values)
{
ALLOW_NONLITERAL_FORMAT_BEGIN
IGNORE_WARNINGS_BEGIN("format-security")
if (Options::traceLLIntSlowPath())
dataLogF(format, values...);
IGNORE_WARNINGS_END
ALLOW_NONLITERAL_FORMAT_END
}
#else // not LLINT_TRACING
template<typename... Types> void slowPathLog(const Types&...) { }
template<typename... Types> void slowPathLogLn(const Types&...) { }
template<typename... Types> void slowPathLogF(const char*, const Types&...) { }
#endif // LLINT_TRACING
extern "C" SlowPathReturnType llint_trace_operand(CallFrame* callFrame, const Instruction* pc, int fromWhere, int operand)
{
if (!Options::traceLLIntExecution())
LLINT_END_IMPL();
LLINT_BEGIN();
dataLogF(
"<%p> %p / %p: executing bc#%zu, op#%u: Trace(%d): %d\n",
&Thread::current(),
callFrame->codeBlock(),
globalObject,
static_cast<intptr_t>(callFrame->codeBlock()->bytecodeOffset(pc)),
pc->opcodeID(),
fromWhere,
operand);
LLINT_END();
}
extern "C" SlowPathReturnType llint_trace_value(CallFrame* callFrame, const Instruction* pc, int fromWhere, VirtualRegister operand)
{
if (!Options::traceLLIntExecution())
LLINT_END_IMPL();
JSValue value = getOperand(callFrame, operand);
union {
struct {
uint32_t tag;
uint32_t payload;
} bits;
EncodedJSValue asValue;
} u;
u.asValue = JSValue::encode(value);
dataLogF(
"<%p> %p / %p: executing bc#%zu, op#%u: Trace(%d): %d: %08x:%08x: %s\n",
&Thread::current(),
callFrame->codeBlock(),
callFrame,
static_cast<intptr_t>(callFrame->codeBlock()->bytecodeOffset(pc)),
pc->opcodeID(),
fromWhere,
operand.offset(),
u.bits.tag,
u.bits.payload,
toCString(value).data());
LLINT_END_IMPL();
}
LLINT_SLOW_PATH_DECL(trace_prologue)
{
if (!Options::traceLLIntExecution())
LLINT_END_IMPL();
CodeBlock* codeBlock = callFrame->codeBlock();
dataLogF("<%p> %p / %p: in prologue of ", &Thread::current(), codeBlock, callFrame);
dataLog(codeBlock, "\n");
LLINT_END_IMPL();
}
static void traceFunctionPrologue(CallFrame* callFrame, const char* comment, CodeSpecializationKind kind)
{
if (!Options::traceLLIntExecution())
return;
JSFunction* callee = jsCast<JSFunction*>(callFrame->jsCallee());
FunctionExecutable* executable = callee->jsExecutable();
CodeBlock* codeBlock = executable->codeBlockFor(kind);
dataLogF("<%p> %p / %p: in %s of ", &Thread::current(), codeBlock, callFrame, comment);
dataLog(codeBlock);
dataLogF(" function %p, executable %p; numVars = %u, numParameters = %u, numCalleeLocals = %u, caller = %p.\n",
callee, executable, codeBlock->numVars(), codeBlock->numParameters(), codeBlock->numCalleeLocals(), callFrame->callerFrame());
}
LLINT_SLOW_PATH_DECL(trace_prologue_function_for_call)
{
traceFunctionPrologue(callFrame, "call prologue", CodeForCall);
LLINT_END_IMPL();
}
LLINT_SLOW_PATH_DECL(trace_prologue_function_for_construct)
{
traceFunctionPrologue(callFrame, "construct prologue", CodeForConstruct);
LLINT_END_IMPL();
}
LLINT_SLOW_PATH_DECL(trace_arityCheck_for_call)
{
traceFunctionPrologue(callFrame, "call arity check", CodeForCall);
LLINT_END_IMPL();
}
LLINT_SLOW_PATH_DECL(trace_arityCheck_for_construct)
{
traceFunctionPrologue(callFrame, "construct arity check", CodeForConstruct);
LLINT_END_IMPL();
}
LLINT_SLOW_PATH_DECL(trace)
{
if (!Options::traceLLIntExecution())
LLINT_END_IMPL();
CodeBlock* codeBlock = callFrame->codeBlock();
OpcodeID opcodeID = pc->opcodeID();
dataLogF("<%p> %p / %p: executing bc#%zu, %s, pc = %p\n",
&Thread::current(),
codeBlock,
callFrame,
static_cast<intptr_t>(codeBlock->bytecodeOffset(pc)),
pc->name(),
pc);
if (opcodeID == op_enter) {
dataLogF("Frame will eventually return to %p\n", callFrame->returnPC().value());
*removeCodePtrTag<volatile char*>(callFrame->returnPC().value());
}
if (opcodeID == op_ret) {
dataLogF("Will be returning to %p\n", callFrame->returnPC().value());
dataLogF("The new cfr will be %p\n", callFrame->callerFrame());
}
LLINT_END_IMPL();
}
enum EntryKind { Prologue, ArityCheck };
#if ENABLE(JIT)
static FunctionAllowlist& ensureGlobalJITAllowlist()
{
static LazyNeverDestroyed<FunctionAllowlist> baselineAllowlist;
static std::once_flag initializeAllowlistFlag;
std::call_once(initializeAllowlistFlag, [] {
const char* functionAllowlistFile = Options::jitAllowlist();
baselineAllowlist.construct(functionAllowlistFile);
});
return baselineAllowlist;
}
inline bool shouldJIT(CodeBlock* codeBlock)
{
if (!Options::bytecodeRangeToJITCompile().isInRange(codeBlock->instructionsSize())
|| !ensureGlobalJITAllowlist().contains(codeBlock))
return false;
return Options::useBaselineJIT();
}
// Returns true if we should try to OSR.
inline bool jitCompileAndSetHeuristics(VM& vm, CodeBlock* codeBlock, BytecodeIndex loopOSREntryBytecodeIndex = BytecodeIndex(0))
{
DeferGCForAWhile deferGC(vm.heap); // My callers don't set top callframe, so we don't want to GC here at all.
ASSERT(Options::useJIT());
codeBlock->updateAllValueProfilePredictions();
if (!codeBlock->checkIfJITThresholdReached()) {
CODEBLOCK_LOG_EVENT(codeBlock, "delayJITCompile", ("threshold not reached, counter = ", codeBlock->llintExecuteCounter()));
dataLogLnIf(Options::verboseOSR(), " JIT threshold should be lifted.");
return false;
}
JITWorklist::ensureGlobalWorklist().poll(vm);
switch (codeBlock->jitType()) {
case JITType::BaselineJIT: {
dataLogLnIf(Options::verboseOSR(), " Code was already compiled.");
codeBlock->jitSoon();
return true;
}
case JITType::InterpreterThunk: {
JITWorklist::ensureGlobalWorklist().compileLater(codeBlock, loopOSREntryBytecodeIndex);
return codeBlock->jitType() == JITType::BaselineJIT;
}
default:
dataLog("Unexpected code block in LLInt: ", *codeBlock, "\n");
RELEASE_ASSERT_NOT_REACHED();
return false;
}
}
static SlowPathReturnType entryOSR(CodeBlock* codeBlock, const char *name, EntryKind kind)
{
dataLogLnIf(Options::verboseOSR(),
*codeBlock, ": Entered ", name, " with executeCounter = ",
codeBlock->llintExecuteCounter());
if (!shouldJIT(codeBlock)) {
codeBlock->dontJITAnytimeSoon();
LLINT_RETURN_TWO(nullptr, nullptr);
}
VM& vm = codeBlock->vm();
if (!jitCompileAndSetHeuristics(vm, codeBlock))
LLINT_RETURN_TWO(nullptr, nullptr);
CODEBLOCK_LOG_EVENT(codeBlock, "OSR entry", ("in prologue"));
if (kind == Prologue)
LLINT_RETURN_TWO(codeBlock->jitCode()->executableAddress(), nullptr);
ASSERT(kind == ArityCheck);
LLINT_RETURN_TWO(codeBlock->jitCode()->addressForCall(MustCheckArity).executableAddress(), nullptr);
}
#else // ENABLE(JIT)
static SlowPathReturnType entryOSR(CodeBlock* codeBlock, const char*, EntryKind)
{
codeBlock->dontJITAnytimeSoon();
LLINT_RETURN_TWO(nullptr, nullptr);
}
#endif // ENABLE(JIT)
LLINT_SLOW_PATH_DECL(entry_osr)
{
UNUSED_PARAM(pc);
return entryOSR(callFrame->codeBlock(), "entry_osr", Prologue);
}
LLINT_SLOW_PATH_DECL(entry_osr_function_for_call)
{
UNUSED_PARAM(pc);
return entryOSR(jsCast<JSFunction*>(callFrame->jsCallee())->jsExecutable()->codeBlockForCall(), "entry_osr_function_for_call", Prologue);
}
LLINT_SLOW_PATH_DECL(entry_osr_function_for_construct)
{
UNUSED_PARAM(pc);
return entryOSR(jsCast<JSFunction*>(callFrame->jsCallee())->jsExecutable()->codeBlockForConstruct(), "entry_osr_function_for_construct", Prologue);
}
LLINT_SLOW_PATH_DECL(entry_osr_function_for_call_arityCheck)
{
UNUSED_PARAM(pc);
return entryOSR(jsCast<JSFunction*>(callFrame->jsCallee())->jsExecutable()->codeBlockForCall(), "entry_osr_function_for_call_arityCheck", ArityCheck);
}
LLINT_SLOW_PATH_DECL(entry_osr_function_for_construct_arityCheck)
{
UNUSED_PARAM(pc);
return entryOSR(jsCast<JSFunction*>(callFrame->jsCallee())->jsExecutable()->codeBlockForConstruct(), "entry_osr_function_for_construct_arityCheck", ArityCheck);
}
LLINT_SLOW_PATH_DECL(loop_osr)
{
LLINT_BEGIN_NO_SET_PC();
UNUSED_PARAM(throwScope);
UNUSED_PARAM(globalObject);
#if ENABLE(JIT)
dataLogLnIf(Options::verboseOSR(),
*codeBlock, ": Entered loop_osr with executeCounter = ",
codeBlock->llintExecuteCounter());
if (UNLIKELY(Options::returnEarlyFromInfiniteLoopsForFuzzing() && codeBlock->loopHintsAreEligibleForFuzzingEarlyReturn())) {
uint64_t* ptr = vm.getLoopHintExecutionCounter(pc);
*ptr += codeBlock->llintExecuteCounter().m_activeThreshold;
if (*ptr >= Options::earlyReturnFromInfiniteLoopsLimit())
LLINT_RETURN_TWO(LLInt::getCodePtr<JSEntryPtrTag>(fuzzer_return_early_from_loop_hint).executableAddress(), callFrame->topOfFrame());
}
auto loopOSREntryBytecodeIndex = BytecodeIndex(codeBlock->bytecodeOffset(pc));
if (!shouldJIT(codeBlock)) {
codeBlock->dontJITAnytimeSoon();
LLINT_RETURN_TWO(nullptr, nullptr);
}
if (!jitCompileAndSetHeuristics(vm, codeBlock, loopOSREntryBytecodeIndex))
LLINT_RETURN_TWO(nullptr, nullptr);
CODEBLOCK_LOG_EVENT(codeBlock, "osrEntry", ("at ", loopOSREntryBytecodeIndex));
ASSERT(codeBlock->jitType() == JITType::BaselineJIT);
const JITCodeMap& codeMap = codeBlock->jitCodeMap();
CodeLocationLabel<JSEntryPtrTag> codeLocation = codeMap.find(loopOSREntryBytecodeIndex);
ASSERT(codeLocation);
void* jumpTarget = codeLocation.executableAddress();
ASSERT(jumpTarget);
LLINT_RETURN_TWO(jumpTarget, callFrame->topOfFrame());
#else // ENABLE(JIT)
UNUSED_PARAM(pc);
codeBlock->dontJITAnytimeSoon();
LLINT_RETURN_TWO(0, 0);
#endif // ENABLE(JIT)
}
LLINT_SLOW_PATH_DECL(replace)
{
LLINT_BEGIN_NO_SET_PC();
UNUSED_PARAM(throwScope);
UNUSED_PARAM(globalObject);
#if ENABLE(JIT)
dataLogLnIf(Options::verboseOSR(),
*codeBlock, ": Entered replace with executeCounter = ",
codeBlock->llintExecuteCounter());
if (shouldJIT(codeBlock))
jitCompileAndSetHeuristics(vm, codeBlock);
else
codeBlock->dontJITAnytimeSoon();
LLINT_END_IMPL();
#else // ENABLE(JIT)
codeBlock->dontJITAnytimeSoon();
LLINT_END_IMPL();
#endif // ENABLE(JIT)
}
LLINT_SLOW_PATH_DECL(stack_check)
{
CodeBlock* codeBlock = callFrame->codeBlock();
JSGlobalObject* globalObject = codeBlock->globalObject();
VM& vm = codeBlock->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
// It's ok to create the SlowPathFrameTracer here before we
// convertToStackOverflowFrame() because this function is always called
// after the frame has been propulated with a proper CodeBlock and callee.
SlowPathFrameTracer tracer(vm, callFrame);
LLINT_SET_PC_FOR_STUBS();
slowPathLogF("Checking stack height with callFrame = %p.\n", callFrame);
slowPathLog("CodeBlock = ", codeBlock, "\n");
if (codeBlock) {
slowPathLogF("Num callee registers = %u.\n", codeBlock->numCalleeLocals());
slowPathLogF("Num vars = %u.\n", codeBlock->numVars());
}
slowPathLogF("Current OS stack end is at %p.\n", vm.softStackLimit());
#if ENABLE(C_LOOP)
slowPathLogF("Current C Loop stack end is at %p.\n", vm.cloopStackLimit());
#endif
// If the stack check succeeds and we don't need to throw the error, then
// we'll return 0 instead. The prologue will check for a non-zero value
// when determining whether to set the callFrame or not.
// For JIT enabled builds which uses the C stack, the stack is not growable.
// Hence, if we get here, then we know a stack overflow is imminent. So, just
// throw the StackOverflowError unconditionally.
#if ENABLE(C_LOOP)
Register* topOfFrame = callFrame->topOfFrame();
if (LIKELY(topOfFrame < reinterpret_cast<Register*>(callFrame))) {
ASSERT(!vm.interpreter->cloopStack().containsAddress(topOfFrame));
if (LIKELY(vm.ensureStackCapacityFor(topOfFrame)))
LLINT_RETURN_TWO(pc, 0);
}
#endif
callFrame->convertToStackOverflowFrame(vm, codeBlock);
ErrorHandlingScope errorScope(vm);
throwStackOverflowError(globalObject, throwScope);
pc = returnToThrow(vm);
LLINT_RETURN_TWO(pc, callFrame);
}
LLINT_SLOW_PATH_DECL(slow_path_new_object)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpNewObject>();
auto& metadata = bytecode.metadata(codeBlock);
LLINT_RETURN(constructEmptyObject(vm, metadata.m_objectAllocationProfile.structure()));
}
LLINT_SLOW_PATH_DECL(slow_path_new_array)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpNewArray>();
auto& metadata = bytecode.metadata(codeBlock);
LLINT_RETURN(constructArrayNegativeIndexed(globalObject, &metadata.m_arrayAllocationProfile, bitwise_cast<JSValue*>(&callFrame->uncheckedR(bytecode.m_argv)), bytecode.m_argc));
}
LLINT_SLOW_PATH_DECL(slow_path_new_array_with_size)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpNewArrayWithSize>();
auto& metadata = bytecode.metadata(codeBlock);
LLINT_RETURN(constructArrayWithSizeQuirk(globalObject, &metadata.m_arrayAllocationProfile, getOperand(callFrame, bytecode.m_length)));
}
LLINT_SLOW_PATH_DECL(slow_path_new_regexp)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpNewRegexp>();
RegExp* regExp = jsCast<RegExp*>(getOperand(callFrame, bytecode.m_regexp));
ASSERT(regExp->isValid());
LLINT_RETURN(RegExpObject::create(vm, globalObject->regExpStructure(), regExp));
}
LLINT_SLOW_PATH_DECL(slow_path_instanceof)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpInstanceof>();
JSValue value = getOperand(callFrame, bytecode.m_value);
JSValue proto = getOperand(callFrame, bytecode.m_prototype);
LLINT_RETURN(jsBoolean(JSObject::defaultHasInstance(globalObject, value, proto)));
}
LLINT_SLOW_PATH_DECL(slow_path_instanceof_custom)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpInstanceofCustom>();
JSValue value = getOperand(callFrame, bytecode.m_value);
JSValue constructor = getOperand(callFrame, bytecode.m_constructor);
JSValue hasInstanceValue = getOperand(callFrame, bytecode.m_hasInstanceValue);
ASSERT(constructor.isObject());
ASSERT(hasInstanceValue != globalObject->functionProtoHasInstanceSymbolFunction() || !constructor.getObject()->structure(vm)->typeInfo().implementsDefaultHasInstance());
JSValue result = jsBoolean(constructor.getObject()->hasInstance(globalObject, value, hasInstanceValue));
LLINT_RETURN(result);
}
LLINT_SLOW_PATH_DECL(slow_path_try_get_by_id)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpTryGetById>();
const Identifier& ident = codeBlock->identifier(bytecode.m_property);
JSValue baseValue = getOperand(callFrame, bytecode.m_base);
PropertySlot slot(baseValue, PropertySlot::PropertySlot::InternalMethodType::VMInquiry, &vm);
baseValue.getPropertySlot(globalObject, ident, slot);
JSValue result = slot.getPureResult();
LLINT_RETURN_PROFILED(result);
}
LLINT_SLOW_PATH_DECL(slow_path_get_by_id_direct)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpGetByIdDirect>();
const Identifier& ident = codeBlock->identifier(bytecode.m_property);
JSValue baseValue = getOperand(callFrame, bytecode.m_base);
PropertySlot slot(baseValue, PropertySlot::PropertySlot::InternalMethodType::GetOwnProperty);
bool found = baseValue.getOwnPropertySlot(globalObject, ident, slot);
LLINT_CHECK_EXCEPTION();
JSValue result = found ? slot.getValue(globalObject, ident) : jsUndefined();
LLINT_CHECK_EXCEPTION();
if (!LLINT_ALWAYS_ACCESS_SLOW && slot.isCacheable() && !slot.isUnset()) {
auto& metadata = bytecode.metadata(codeBlock);
{
StructureID oldStructureID = metadata.m_structureID;
if (oldStructureID) {
Structure* a = vm.heap.structureIDTable().get(oldStructureID);
Structure* b = baseValue.asCell()->structure(vm);
if (Structure::shouldConvertToPolyProto(a, b)) {
ASSERT(a->rareData()->sharedPolyProtoWatchpoint().get() == b->rareData()->sharedPolyProtoWatchpoint().get());
a->rareData()->sharedPolyProtoWatchpoint()->invalidate(vm, StringFireDetail("Detected poly proto opportunity."));
}
}
}
JSCell* baseCell = baseValue.asCell();
Structure* structure = baseCell->structure(vm);
if (slot.isValue()) {
// Start out by clearing out the old cache.
metadata.m_structureID = 0;
metadata.m_offset = 0;
if (structure->propertyAccessesAreCacheable() && !structure->needImpurePropertyWatchpoint()) {
{
ConcurrentJSLocker locker(codeBlock->m_lock);
metadata.m_structureID = structure->id();
metadata.m_offset = slot.cachedOffset();
}
vm.heap.writeBarrier(codeBlock);
}
}
}
LLINT_RETURN_PROFILED(result);
}
static void setupGetByIdPrototypeCache(JSGlobalObject* globalObject, VM& vm, CodeBlock* codeBlock, const Instruction* pc, GetByIdModeMetadata& metadata, JSCell* baseCell, PropertySlot& slot, const Identifier& ident)
{
Structure* structure = baseCell->structure(vm);
if (structure->typeInfo().prohibitsPropertyCaching())
return;
if (structure->needImpurePropertyWatchpoint())
return;
if (structure->isDictionary()) {
if (structure->hasBeenFlattenedBefore())
return;
structure->flattenDictionaryStructure(vm, jsCast<JSObject*>(baseCell));
}
prepareChainForCaching(globalObject, baseCell, slot);
ObjectPropertyConditionSet conditions;
if (slot.isUnset())
conditions = generateConditionsForPropertyMiss(vm, codeBlock, globalObject, structure, ident.impl());
else
conditions = generateConditionsForPrototypePropertyHit(vm, codeBlock, globalObject, structure, slot.slotBase(), ident.impl());
if (!conditions.isValid())
return;
unsigned bytecodeOffset = codeBlock->bytecodeOffset(pc);
PropertyOffset offset = invalidOffset;
CodeBlock::StructureWatchpointMap& watchpointMap = codeBlock->llintGetByIdWatchpointMap();
Vector<LLIntPrototypeLoadAdaptiveStructureWatchpoint> watchpoints;
watchpoints.reserveInitialCapacity(conditions.size());
for (ObjectPropertyCondition condition : conditions) {
if (!condition.isWatchable())
return;
if (condition.condition().kind() == PropertyCondition::Presence)
offset = condition.condition().offset();
watchpoints.uncheckedConstructAndAppend(codeBlock, condition, bytecodeOffset);
watchpoints.last().install(vm);
}
ASSERT((offset == invalidOffset) == slot.isUnset());
auto result = watchpointMap.add(std::make_tuple(structure->id(), bytecodeOffset), WTFMove(watchpoints));
ASSERT_UNUSED(result, result.isNewEntry);
{
ConcurrentJSLocker locker(codeBlock->m_lock);
if (slot.isUnset())
metadata.setUnsetMode(structure);
else {
ASSERT(slot.isValue());
metadata.setProtoLoadMode(structure, offset, slot.slotBase());
}
}
vm.heap.writeBarrier(codeBlock);
}
static JSValue performLLIntGetByID(const Instruction* pc, CodeBlock* codeBlock, JSGlobalObject* globalObject, JSValue baseValue, const Identifier& ident, GetByIdModeMetadata& metadata)
{
VM& vm = globalObject->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
PropertySlot slot(baseValue, PropertySlot::PropertySlot::InternalMethodType::Get);
JSValue result = baseValue.get(globalObject, ident, slot);
RETURN_IF_EXCEPTION(throwScope, { });
if (!LLINT_ALWAYS_ACCESS_SLOW
&& baseValue.isCell()
&& slot.isCacheable()
&& !slot.isUnset()) {
{
StructureID oldStructureID;
switch (metadata.mode) {
case GetByIdMode::Default:
oldStructureID = metadata.defaultMode.structureID;
break;
case GetByIdMode::Unset:
oldStructureID = metadata.unsetMode.structureID;
break;
case GetByIdMode::ProtoLoad:
oldStructureID = metadata.protoLoadMode.structureID;
break;
default:
oldStructureID = 0;
}
if (oldStructureID) {
Structure* a = vm.heap.structureIDTable().get(oldStructureID);
Structure* b = baseValue.asCell()->structure(vm);
if (Structure::shouldConvertToPolyProto(a, b)) {
ASSERT(a->rareData()->sharedPolyProtoWatchpoint().get() == b->rareData()->sharedPolyProtoWatchpoint().get());
a->rareData()->sharedPolyProtoWatchpoint()->invalidate(vm, StringFireDetail("Detected poly proto opportunity."));
}
}
}
JSCell* baseCell = baseValue.asCell();
Structure* structure = baseCell->structure(vm);
if (slot.isValue() && slot.slotBase() == baseValue) {
ConcurrentJSLocker locker(codeBlock->m_lock);
// Start out by clearing out the old cache.
metadata.clearToDefaultModeWithoutCache();
// Prevent the prototype cache from ever happening.
metadata.hitCountForLLIntCaching = 0;
if (structure->propertyAccessesAreCacheable() && !structure->needImpurePropertyWatchpoint()) {
metadata.defaultMode.structureID = structure->id();
metadata.defaultMode.cachedOffset = slot.cachedOffset();
vm.heap.writeBarrier(codeBlock);
}
} else if (UNLIKELY(metadata.hitCountForLLIntCaching && slot.isValue())) {
ASSERT(slot.slotBase() != baseValue);
if (!(--metadata.hitCountForLLIntCaching))
setupGetByIdPrototypeCache(globalObject, vm, codeBlock, pc, metadata, baseCell, slot, ident);
}
} else if (!LLINT_ALWAYS_ACCESS_SLOW && isJSArray(baseValue) && ident == vm.propertyNames->length) {
{
ConcurrentJSLocker locker(codeBlock->m_lock);
metadata.setArrayLengthMode();
metadata.arrayLengthMode.arrayProfile.observeStructure(baseValue.asCell()->structure(vm));
}
vm.heap.writeBarrier(codeBlock);
}
return result;
}
LLINT_SLOW_PATH_DECL(slow_path_get_by_id)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpGetById>();
auto& metadata = bytecode.metadata(codeBlock);
const Identifier& ident = codeBlock->identifier(bytecode.m_property);
JSValue baseValue = getOperand(callFrame, bytecode.m_base);
JSValue result = performLLIntGetByID(pc, codeBlock, globalObject, baseValue, ident, metadata.m_modeMetadata);
LLINT_RETURN_PROFILED(result);
}
LLINT_SLOW_PATH_DECL(slow_path_iterator_open_get_next)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpIteratorOpen>();
auto& metadata = bytecode.metadata(codeBlock);
JSValue iterator = getOperand(callFrame, bytecode.m_iterator);
Register& nextRegister = callFrame->uncheckedR(bytecode.m_next);
if (!iterator.isObject())
LLINT_THROW(createTypeError(globalObject, "Iterator result interface is not an object."_s));
JSValue result = performLLIntGetByID(pc, codeBlock, globalObject, iterator, vm.propertyNames->next, metadata.m_modeMetadata);
LLINT_CHECK_EXCEPTION();
nextRegister = result;
bytecode.metadata(codeBlock).m_nextProfile.m_buckets[0] = JSValue::encode(result);
LLINT_END();
}
LLINT_SLOW_PATH_DECL(slow_path_iterator_next_get_done)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpIteratorNext>();
auto& metadata = bytecode.metadata(codeBlock);
// We use m_value to hold the iterator return value since it's either not live past this bytecode or it's going to be filled later.
JSValue iteratorReturn = getOperand(callFrame, bytecode.m_value);
Register& doneRegister = callFrame->uncheckedR(bytecode.m_done);
if (!iteratorReturn.isObject())
LLINT_THROW(createTypeError(globalObject, "Iterator result interface is not an object."_s));
JSValue result = performLLIntGetByID(pc, codeBlock, globalObject, iteratorReturn, vm.propertyNames->done, metadata.m_doneModeMetadata);
LLINT_CHECK_EXCEPTION();
doneRegister = result;
bytecode.metadata(codeBlock).m_doneProfile.m_buckets[0] = JSValue::encode(result);
LLINT_END();
}
LLINT_SLOW_PATH_DECL(slow_path_iterator_next_get_value)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpIteratorNext>();
auto& metadata = bytecode.metadata(codeBlock);
// We use m_value to hold the iterator return value tmp since it's either not live past this bytecode or it's going to be filled later.
Register& valueRegister = callFrame->uncheckedR(bytecode.m_value);
JSValue iteratorReturn = valueRegister.jsValue();
JSValue result = performLLIntGetByID(pc, codeBlock, globalObject, iteratorReturn, vm.propertyNames->value, metadata.m_valueModeMetadata);
LLINT_CHECK_EXCEPTION();
valueRegister = result;
bytecode.metadata(codeBlock).m_valueProfile.m_buckets[0] = JSValue::encode(result);
LLINT_END();
}
LLINT_SLOW_PATH_DECL(slow_path_put_by_id)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpPutById>();
auto& metadata = bytecode.metadata(codeBlock);
const Identifier& ident = codeBlock->identifier(bytecode.m_property);
JSValue baseValue = getOperand(callFrame, bytecode.m_base);
PutPropertySlot slot(baseValue, bytecode.m_flags.ecmaMode().isStrict(), codeBlock->putByIdContext());
Structure* oldStructure = baseValue.isCell() ? baseValue.asCell()->structure(vm) : nullptr;
if (bytecode.m_flags.isDirect())
CommonSlowPaths::putDirectWithReify(vm, globalObject, asObject(baseValue), ident, getOperand(callFrame, bytecode.m_value), slot);
else
baseValue.putInline(globalObject, ident, getOperand(callFrame, bytecode.m_value), slot);
LLINT_CHECK_EXCEPTION();
if (!LLINT_ALWAYS_ACCESS_SLOW
&& baseValue.isCell()
&& slot.isCacheablePut()
&& oldStructure->propertyAccessesAreCacheable()) {
{
StructureID oldStructureID = metadata.m_oldStructureID;
if (oldStructureID) {
Structure* a = vm.heap.structureIDTable().get(oldStructureID);
Structure* b = baseValue.asCell()->structure(vm);
if (slot.type() == PutPropertySlot::NewProperty)
b = b->previousID();
if (Structure::shouldConvertToPolyProto(a, b)) {
a->rareData()->sharedPolyProtoWatchpoint()->invalidate(vm, StringFireDetail("Detected poly proto opportunity."));
b->rareData()->sharedPolyProtoWatchpoint()->invalidate(vm, StringFireDetail("Detected poly proto opportunity."));
}
}
}
// Start out by clearing out the old cache.
metadata.m_oldStructureID = 0;
metadata.m_offset = 0;
metadata.m_newStructureID = 0;
metadata.m_structureChain.clear();
JSCell* baseCell = baseValue.asCell();
Structure* newStructure = baseCell->structure(vm);
if (newStructure->propertyAccessesAreCacheable() && baseCell == slot.base()) {
if (slot.type() == PutPropertySlot::NewProperty) {
GCSafeConcurrentJSLocker locker(codeBlock->m_lock, vm.heap);
if (!newStructure->isDictionary() && newStructure->previousID()->outOfLineCapacity() == newStructure->outOfLineCapacity()) {
ASSERT(oldStructure == newStructure->previousID());
if (oldStructure == newStructure->previousID()) {
ASSERT(oldStructure->transitionWatchpointSetHasBeenInvalidated());
bool sawPolyProto = false;
auto result = normalizePrototypeChain(globalObject, baseCell, sawPolyProto);
if (result != InvalidPrototypeChain && !sawPolyProto) {
ASSERT(oldStructure->isObject());
metadata.m_oldStructureID = oldStructure->id();
metadata.m_offset = slot.cachedOffset();
metadata.m_newStructureID = newStructure->id();
if (!(bytecode.m_flags.isDirect())) {
StructureChain* chain = newStructure->prototypeChain(globalObject, asObject(baseCell));
ASSERT(chain);
metadata.m_structureChain.set(vm, codeBlock, chain);
}
vm.heap.writeBarrier(codeBlock);
}
}
}
} else {
// This assert helps catch bugs if we accidentally forget to disable caching
// when we transition then store to an existing property. This is common among
// paths that reify lazy properties. If we reify a lazy property and forget
// to disable caching, we may come down this path. The Replace IC does not
// know how to model these types of structure transitions (or any structure
// transition for that matter).
RELEASE_ASSERT(newStructure == oldStructure);
newStructure->didCachePropertyReplacement(vm, slot.cachedOffset());
{
ConcurrentJSLocker locker(codeBlock->m_lock);
metadata.m_oldStructureID = newStructure->id();
metadata.m_offset = slot.cachedOffset();
}
vm.heap.writeBarrier(codeBlock);
}
}
}
LLINT_END();
}
LLINT_SLOW_PATH_DECL(slow_path_del_by_id)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpDelById>();
JSObject* baseObject = getOperand(callFrame, bytecode.m_base).toObject(globalObject);
LLINT_CHECK_EXCEPTION();
bool couldDelete = JSCell::deleteProperty(baseObject, globalObject, codeBlock->identifier(bytecode.m_property));
LLINT_CHECK_EXCEPTION();
if (!couldDelete && bytecode.m_ecmaMode.isStrict())
LLINT_THROW(createTypeError(globalObject, UnableToDeletePropertyError));
LLINT_RETURN(jsBoolean(couldDelete));
}
static ALWAYS_INLINE JSValue getByVal(VM& vm, JSGlobalObject* globalObject, CodeBlock* codeBlock, JSValue baseValue, JSValue subscript, OpGetByVal bytecode)
{
auto scope = DECLARE_THROW_SCOPE(vm);
if (LIKELY(baseValue.isCell() && subscript.isString())) {