mirrored from https://chromium.googlesource.com/v8/v8.git
/
compiler.cc
1821 lines (1568 loc) · 68.6 KB
/
compiler.cc
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 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/compiler.h"
#include <algorithm>
#include <memory>
#include "src/asmjs/asm-js.h"
#include "src/asmjs/asm-typer.h"
#include "src/ast/ast-numbering.h"
#include "src/ast/prettyprinter.h"
#include "src/ast/scopes.h"
#include "src/bootstrapper.h"
#include "src/codegen.h"
#include "src/compilation-cache.h"
#include "src/compiler-dispatcher/optimizing-compile-dispatcher.h"
#include "src/compiler/pipeline.h"
#include "src/crankshaft/hydrogen.h"
#include "src/debug/debug.h"
#include "src/debug/liveedit.h"
#include "src/deoptimizer.h"
#include "src/frames-inl.h"
#include "src/full-codegen/full-codegen.h"
#include "src/globals.h"
#include "src/heap/heap.h"
#include "src/interpreter/interpreter.h"
#include "src/isolate-inl.h"
#include "src/log-inl.h"
#include "src/messages.h"
#include "src/parsing/parser.h"
#include "src/parsing/rewriter.h"
#include "src/parsing/scanner-character-streams.h"
#include "src/runtime-profiler.h"
#include "src/snapshot/code-serializer.h"
#include "src/vm-state-inl.h"
namespace v8 {
namespace internal {
// A wrapper around a CompilationInfo that detaches the Handles from
// the underlying DeferredHandleScope and stores them in info_ on
// destruction.
class CompilationHandleScope final {
public:
explicit CompilationHandleScope(CompilationInfo* info)
: deferred_(info->isolate()), info_(info) {}
~CompilationHandleScope() { info_->set_deferred_handles(deferred_.Detach()); }
private:
DeferredHandleScope deferred_;
CompilationInfo* info_;
};
// Helper that times a scoped region and records the elapsed time.
struct ScopedTimer {
explicit ScopedTimer(base::TimeDelta* location) : location_(location) {
DCHECK(location_ != NULL);
timer_.Start();
}
~ScopedTimer() { *location_ += timer_.Elapsed(); }
base::ElapsedTimer timer_;
base::TimeDelta* location_;
};
// ----------------------------------------------------------------------------
// Implementation of CompilationJob
CompilationJob::Status CompilationJob::PrepareJob() {
DCHECK(ThreadId::Current().Equals(info()->isolate()->thread_id()));
DisallowJavascriptExecution no_js(isolate());
if (FLAG_trace_opt && info()->IsOptimizing()) {
OFStream os(stdout);
os << "[compiling method " << Brief(*info()->closure()) << " using "
<< compiler_name_;
if (info()->is_osr()) os << " OSR";
os << "]" << std::endl;
}
// Delegate to the underlying implementation.
DCHECK(state() == State::kReadyToPrepare);
ScopedTimer t(&time_taken_to_prepare_);
return UpdateState(PrepareJobImpl(), State::kReadyToExecute);
}
CompilationJob::Status CompilationJob::ExecuteJob() {
std::unique_ptr<DisallowHeapAllocation> no_allocation;
std::unique_ptr<DisallowHandleAllocation> no_handles;
std::unique_ptr<DisallowHandleDereference> no_deref;
std::unique_ptr<DisallowCodeDependencyChange> no_dependency_change;
if (can_execute_on_background_thread()) {
no_allocation.reset(new DisallowHeapAllocation());
no_handles.reset(new DisallowHandleAllocation());
no_deref.reset(new DisallowHandleDereference());
no_dependency_change.reset(new DisallowCodeDependencyChange());
} else {
DCHECK(ThreadId::Current().Equals(info()->isolate()->thread_id()));
}
// Delegate to the underlying implementation.
DCHECK(state() == State::kReadyToExecute);
ScopedTimer t(&time_taken_to_execute_);
return UpdateState(ExecuteJobImpl(), State::kReadyToFinalize);
}
CompilationJob::Status CompilationJob::FinalizeJob() {
DCHECK(ThreadId::Current().Equals(info()->isolate()->thread_id()));
DisallowCodeDependencyChange no_dependency_change;
DisallowJavascriptExecution no_js(isolate());
DCHECK(!info()->dependencies()->HasAborted());
// Delegate to the underlying implementation.
DCHECK(state() == State::kReadyToFinalize);
ScopedTimer t(&time_taken_to_finalize_);
return UpdateState(FinalizeJobImpl(), State::kSucceeded);
}
CompilationJob::Status CompilationJob::RetryOptimization(BailoutReason reason) {
DCHECK(info_->IsOptimizing());
info_->RetryOptimization(reason);
state_ = State::kFailed;
return FAILED;
}
CompilationJob::Status CompilationJob::AbortOptimization(BailoutReason reason) {
DCHECK(info_->IsOptimizing());
info_->AbortOptimization(reason);
state_ = State::kFailed;
return FAILED;
}
void CompilationJob::RecordUnoptimizedCompilationStats() const {
int code_size;
if (info()->has_bytecode_array()) {
code_size = info()->bytecode_array()->SizeIncludingMetadata();
} else {
code_size = info()->code()->SizeIncludingMetadata();
}
Counters* counters = isolate()->counters();
// TODO(4280): Rename counters from "baseline" to "unoptimized" eventually.
counters->total_baseline_code_size()->Increment(code_size);
counters->total_baseline_compile_count()->Increment(1);
// TODO(5203): Add timers for each phase of compilation.
}
void CompilationJob::RecordOptimizedCompilationStats() const {
DCHECK(info()->IsOptimizing());
Handle<JSFunction> function = info()->closure();
if (!function->IsOptimized()) {
// Concurrent recompilation and OSR may race. Increment only once.
int opt_count = function->shared()->opt_count();
function->shared()->set_opt_count(opt_count + 1);
}
double ms_creategraph = time_taken_to_prepare_.InMillisecondsF();
double ms_optimize = time_taken_to_execute_.InMillisecondsF();
double ms_codegen = time_taken_to_finalize_.InMillisecondsF();
if (FLAG_trace_opt) {
PrintF("[optimizing ");
function->ShortPrint();
PrintF(" - took %0.3f, %0.3f, %0.3f ms]\n", ms_creategraph, ms_optimize,
ms_codegen);
}
if (FLAG_trace_opt_stats) {
static double compilation_time = 0.0;
static int compiled_functions = 0;
static int code_size = 0;
compilation_time += (ms_creategraph + ms_optimize + ms_codegen);
compiled_functions++;
code_size += function->shared()->SourceSize();
PrintF("Compiled: %d functions with %d byte source size in %fms.\n",
compiled_functions, code_size, compilation_time);
}
if (FLAG_hydrogen_stats) {
isolate()->GetHStatistics()->IncrementSubtotals(time_taken_to_prepare_,
time_taken_to_execute_,
time_taken_to_finalize_);
}
}
Isolate* CompilationJob::isolate() const { return info()->isolate(); }
namespace {
void AddWeakObjectToCodeDependency(Isolate* isolate, Handle<HeapObject> object,
Handle<Code> code) {
Handle<WeakCell> cell = Code::WeakCellFor(code);
Heap* heap = isolate->heap();
if (heap->InNewSpace(*object)) {
heap->AddWeakNewSpaceObjectToCodeDependency(object, cell);
} else {
Handle<DependentCode> dep(heap->LookupWeakObjectToCodeDependency(object));
dep =
DependentCode::InsertWeakCode(dep, DependentCode::kWeakCodeGroup, cell);
heap->AddWeakObjectToCodeDependency(object, dep);
}
}
} // namespace
void CompilationJob::RegisterWeakObjectsInOptimizedCode(Handle<Code> code) {
// TODO(turbofan): Move this to pipeline.cc once Crankshaft dies.
Isolate* const isolate = code->GetIsolate();
DCHECK(code->is_optimized_code());
std::vector<Handle<Map>> maps;
std::vector<Handle<HeapObject>> objects;
{
DisallowHeapAllocation no_gc;
int const mode_mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT) |
RelocInfo::ModeMask(RelocInfo::CELL);
for (RelocIterator it(*code, mode_mask); !it.done(); it.next()) {
RelocInfo::Mode mode = it.rinfo()->rmode();
if (mode == RelocInfo::CELL &&
code->IsWeakObjectInOptimizedCode(it.rinfo()->target_cell())) {
objects.push_back(handle(it.rinfo()->target_cell(), isolate));
} else if (mode == RelocInfo::EMBEDDED_OBJECT &&
code->IsWeakObjectInOptimizedCode(
it.rinfo()->target_object())) {
Handle<HeapObject> object(HeapObject::cast(it.rinfo()->target_object()),
isolate);
if (object->IsMap()) {
maps.push_back(Handle<Map>::cast(object));
} else {
objects.push_back(object);
}
}
}
}
for (Handle<Map> map : maps) {
if (map->dependent_code()->IsEmpty(DependentCode::kWeakCodeGroup)) {
isolate->heap()->AddRetainedMap(map);
}
Map::AddDependentCode(map, DependentCode::kWeakCodeGroup, code);
}
for (Handle<HeapObject> object : objects) {
AddWeakObjectToCodeDependency(isolate, object, code);
}
code->set_can_have_weak_objects(true);
}
// ----------------------------------------------------------------------------
// Local helper methods that make up the compilation pipeline.
namespace {
bool Parse(ParseInfo* info) {
// Create a canonical handle scope if compiling ignition bytecode. This is
// required by the constant array builder to de-duplicate objects without
// dereferencing handles.
std::unique_ptr<CanonicalHandleScope> canonical;
if (FLAG_ignition) canonical.reset(new CanonicalHandleScope(info->isolate()));
return Parser::ParseStatic(info);
}
void RecordFunctionCompilation(CodeEventListener::LogEventsAndTags tag,
CompilationInfo* info) {
// Log the code generation. If source information is available include
// script name and line number. Check explicitly whether logging is
// enabled as finding the line number is not free.
if (info->isolate()->logger()->is_logging_code_events() ||
info->isolate()->is_profiling()) {
Handle<SharedFunctionInfo> shared = info->shared_info();
Handle<Script> script = info->parse_info()->script();
Handle<AbstractCode> abstract_code =
info->has_bytecode_array()
? Handle<AbstractCode>::cast(info->bytecode_array())
: Handle<AbstractCode>::cast(info->code());
if (abstract_code.is_identical_to(
info->isolate()->builtins()->CompileLazy())) {
return;
}
int line_num = Script::GetLineNumber(script, shared->start_position()) + 1;
int column_num =
Script::GetColumnNumber(script, shared->start_position()) + 1;
String* script_name = script->name()->IsString()
? String::cast(script->name())
: info->isolate()->heap()->empty_string();
CodeEventListener::LogEventsAndTags log_tag =
Logger::ToNativeByScript(tag, *script);
PROFILE(info->isolate(),
CodeCreateEvent(log_tag, *abstract_code, *shared, script_name,
line_num, column_num));
}
}
void EnsureFeedbackMetadata(CompilationInfo* info) {
DCHECK(info->has_shared_info());
// If no type feedback metadata exists, we create it now. At this point the
// AstNumbering pass has already run. Note the snapshot can contain outdated
// vectors for a different configuration, hence we also recreate a new vector
// when the function is not compiled (i.e. no code was serialized).
// TODO(mvstanton): reintroduce is_empty() predicate to feedback_metadata().
if (info->shared_info()->feedback_metadata()->length() == 0 ||
!info->shared_info()->is_compiled()) {
Handle<TypeFeedbackMetadata> feedback_metadata = TypeFeedbackMetadata::New(
info->isolate(), info->literal()->feedback_vector_spec());
info->shared_info()->set_feedback_metadata(*feedback_metadata);
}
// It's very important that recompiles do not alter the structure of the type
// feedback vector. Verify that the structure fits the function literal.
CHECK(!info->shared_info()->feedback_metadata()->SpecDiffersFrom(
info->literal()->feedback_vector_spec()));
}
bool ShouldUseIgnition(CompilationInfo* info) {
if (!FLAG_ignition) return false;
DCHECK(info->has_shared_info());
// When requesting debug code as a replacement for existing code, we provide
// the same kind as the existing code (to prevent implicit tier-change).
if (info->is_debug() && info->shared_info()->is_compiled()) {
return !info->shared_info()->HasBaselineCode();
}
// Since we can't OSR from Ignition, skip Ignition for asm.js functions.
if (info->shared_info()->asm_function()) {
return false;
}
// Checks whether top level functions should be passed by the filter.
if (info->shared_info()->is_toplevel()) {
Vector<const char> filter = CStrVector(FLAG_ignition_filter);
return (filter.length() == 0) || (filter.length() == 1 && filter[0] == '*');
}
// Finally respect the filter.
return info->shared_info()->PassesFilter(FLAG_ignition_filter);
}
CompilationJob* GetUnoptimizedCompilationJob(CompilationInfo* info) {
// Function should have been parsed and analyzed before creating a compilation
// job.
DCHECK_NOT_NULL(info->literal());
DCHECK_NOT_NULL(info->scope());
EnsureFeedbackMetadata(info);
if (ShouldUseIgnition(info)) {
return interpreter::Interpreter::NewCompilationJob(info);
} else {
return FullCodeGenerator::NewCompilationJob(info);
}
}
void InstallSharedScopeInfo(CompilationInfo* info,
Handle<SharedFunctionInfo> shared) {
Handle<ScopeInfo> scope_info = info->scope()->scope_info();
shared->set_scope_info(*scope_info);
Scope* outer_scope = info->scope()->GetOuterScopeWithContext();
if (outer_scope) {
shared->set_outer_scope_info(*outer_scope->scope_info());
}
}
void InstallSharedCompilationResult(CompilationInfo* info,
Handle<SharedFunctionInfo> shared) {
// TODO(mstarzinger): Compiling for debug code might be used to reveal inner
// functions via {FindSharedFunctionInfoInScript}, in which case we end up
// regenerating existing bytecode. Fix this!
if (info->is_debug() && info->has_bytecode_array()) {
shared->ClearBytecodeArray();
}
DCHECK(!info->code().is_null());
shared->ReplaceCode(*info->code());
if (info->has_bytecode_array()) {
DCHECK(!shared->HasBytecodeArray()); // Only compiled once.
shared->set_bytecode_array(*info->bytecode_array());
}
}
void InstallUnoptimizedCode(CompilationInfo* info) {
Handle<SharedFunctionInfo> shared = info->shared_info();
// Update the shared function info with the scope info.
InstallSharedScopeInfo(info, shared);
// Install compilation result on the shared function info
InstallSharedCompilationResult(info, shared);
}
CompilationJob::Status FinalizeUnoptimizedCompilationJob(CompilationJob* job) {
CompilationJob::Status status = job->FinalizeJob();
if (status == CompilationJob::SUCCEEDED) {
InstallUnoptimizedCode(job->info());
job->RecordUnoptimizedCompilationStats();
}
return status;
}
bool GenerateUnoptimizedCode(CompilationInfo* info) {
if (FLAG_validate_asm && info->scope()->asm_module() &&
!info->shared_info()->is_asm_wasm_broken()) {
EnsureFeedbackMetadata(info);
MaybeHandle<FixedArray> wasm_data;
wasm_data = AsmJs::ConvertAsmToWasm(info->parse_info());
if (!wasm_data.is_null()) {
info->shared_info()->set_asm_wasm_data(*wasm_data.ToHandleChecked());
info->SetCode(info->isolate()->builtins()->InstantiateAsmJs());
InstallUnoptimizedCode(info);
return true;
}
}
std::unique_ptr<CompilationJob> job(GetUnoptimizedCompilationJob(info));
if (job->PrepareJob() != CompilationJob::SUCCEEDED) return false;
if (job->ExecuteJob() != CompilationJob::SUCCEEDED) return false;
if (FinalizeUnoptimizedCompilationJob(job.get()) !=
CompilationJob::SUCCEEDED) {
return false;
}
return true;
}
bool CompileUnoptimizedCode(CompilationInfo* info) {
DCHECK(AllowCompilation::IsAllowed(info->isolate()));
if (!Compiler::Analyze(info->parse_info()) ||
!GenerateUnoptimizedCode(info)) {
Isolate* isolate = info->isolate();
if (!isolate->has_pending_exception()) isolate->StackOverflow();
return false;
}
return true;
}
MUST_USE_RESULT MaybeHandle<Code> GetUnoptimizedCode(CompilationInfo* info) {
VMState<COMPILER> state(info->isolate());
PostponeInterruptsScope postpone(info->isolate());
// Parse and update CompilationInfo with the results.
if (!Parse(info->parse_info())) return MaybeHandle<Code>();
DCHECK_EQ(info->shared_info()->language_mode(),
info->literal()->language_mode());
// Compile either unoptimized code or bytecode for the interpreter.
if (!CompileUnoptimizedCode(info)) return MaybeHandle<Code>();
// Record the function compilation event.
RecordFunctionCompilation(CodeEventListener::LAZY_COMPILE_TAG, info);
return info->code();
}
MUST_USE_RESULT MaybeHandle<Code> GetCodeFromOptimizedCodeMap(
Handle<JSFunction> function, BailoutId osr_ast_id) {
Handle<SharedFunctionInfo> shared(function->shared());
DisallowHeapAllocation no_gc;
CodeAndLiterals cached = shared->SearchOptimizedCodeMap(
function->context()->native_context(), osr_ast_id);
if (cached.code != nullptr) {
// Caching of optimized code enabled and optimized code found.
if (cached.literals != nullptr) function->set_literals(cached.literals);
DCHECK(!cached.code->marked_for_deoptimization());
DCHECK(function->shared()->is_compiled());
return Handle<Code>(cached.code);
}
return MaybeHandle<Code>();
}
void InsertCodeIntoOptimizedCodeMap(CompilationInfo* info) {
Handle<Code> code = info->code();
if (code->kind() != Code::OPTIMIZED_FUNCTION) return; // Nothing to do.
// Function context specialization folds-in the function context,
// so no sharing can occur.
if (info->is_function_context_specializing()) return;
// Frame specialization implies function context specialization.
DCHECK(!info->is_frame_specializing());
// TODO(4764): When compiling for OSR from bytecode, BailoutId might derive
// from bytecode offset and overlap with actual BailoutId. No caching!
if (info->is_osr() && info->is_optimizing_from_bytecode()) return;
// Cache optimized context-specific code.
Handle<JSFunction> function = info->closure();
Handle<SharedFunctionInfo> shared(function->shared());
Handle<LiteralsArray> literals(function->literals());
Handle<Context> native_context(function->context()->native_context());
SharedFunctionInfo::AddToOptimizedCodeMap(shared, native_context, code,
literals, info->osr_ast_id());
}
bool Renumber(ParseInfo* parse_info) {
// Create a canonical handle scope if compiling ignition bytecode. This is
// required by the constant array builder to de-duplicate objects without
// dereferencing handles.
std::unique_ptr<CanonicalHandleScope> canonical;
if (FLAG_ignition) {
canonical.reset(new CanonicalHandleScope(parse_info->isolate()));
}
if (!AstNumbering::Renumber(parse_info->isolate(), parse_info->zone(),
parse_info->literal())) {
return false;
}
Handle<SharedFunctionInfo> shared_info = parse_info->shared_info();
if (!shared_info.is_null()) {
FunctionLiteral* lit = parse_info->literal();
shared_info->set_ast_node_count(lit->ast_node_count());
if (lit->dont_optimize_reason() != kNoReason) {
shared_info->DisableOptimization(lit->dont_optimize_reason());
}
if (lit->flags() & AstProperties::kDontCrankshaft) {
shared_info->set_dont_crankshaft(true);
}
}
return true;
}
bool UseTurboFan(Handle<SharedFunctionInfo> shared) {
bool optimization_disabled = shared->optimization_disabled();
bool dont_crankshaft = shared->dont_crankshaft();
// Check the enabling conditions for Turbofan.
// 1. "use asm" code.
bool is_turbofanable_asm =
FLAG_turbo_asm && shared->asm_function() && !optimization_disabled;
// 2. Fallback for features unsupported by Crankshaft.
bool is_unsupported_by_crankshaft_but_turbofanable =
dont_crankshaft && strcmp(FLAG_turbo_filter, "~~") == 0 &&
!optimization_disabled;
// 3. Explicitly enabled by the command-line filter.
bool passes_turbo_filter = shared->PassesFilter(FLAG_turbo_filter);
return is_turbofanable_asm || is_unsupported_by_crankshaft_but_turbofanable ||
passes_turbo_filter;
}
bool GetOptimizedCodeNow(CompilationJob* job) {
CompilationInfo* info = job->info();
Isolate* isolate = info->isolate();
// Parsing is not required when optimizing from existing bytecode.
if (!info->is_optimizing_from_bytecode()) {
if (!Compiler::ParseAndAnalyze(info->parse_info())) return false;
EnsureFeedbackMetadata(info);
}
JSFunction::EnsureLiterals(info->closure());
TimerEventScope<TimerEventRecompileSynchronous> timer(isolate);
RuntimeCallTimerScope runtimeTimer(isolate,
&RuntimeCallStats::RecompileSynchronous);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"),
"V8.RecompileSynchronous");
if (job->PrepareJob() != CompilationJob::SUCCEEDED ||
job->ExecuteJob() != CompilationJob::SUCCEEDED ||
job->FinalizeJob() != CompilationJob::SUCCEEDED) {
if (FLAG_trace_opt) {
PrintF("[aborted optimizing ");
info->closure()->ShortPrint();
PrintF(" because: %s]\n", GetBailoutReason(info->bailout_reason()));
}
return false;
}
// Success!
job->RecordOptimizedCompilationStats();
DCHECK(!isolate->has_pending_exception());
InsertCodeIntoOptimizedCodeMap(info);
RecordFunctionCompilation(CodeEventListener::LAZY_COMPILE_TAG, info);
return true;
}
bool GetOptimizedCodeLater(CompilationJob* job) {
CompilationInfo* info = job->info();
Isolate* isolate = info->isolate();
if (!isolate->optimizing_compile_dispatcher()->IsQueueAvailable()) {
if (FLAG_trace_concurrent_recompilation) {
PrintF(" ** Compilation queue full, will retry optimizing ");
info->closure()->ShortPrint();
PrintF(" later.\n");
}
return false;
}
if (isolate->heap()->HighMemoryPressure()) {
if (FLAG_trace_concurrent_recompilation) {
PrintF(" ** High memory pressure, will retry optimizing ");
info->closure()->ShortPrint();
PrintF(" later.\n");
}
return false;
}
// Parsing is not required when optimizing from existing bytecode.
if (!info->is_optimizing_from_bytecode()) {
if (!Compiler::ParseAndAnalyze(info->parse_info())) return false;
EnsureFeedbackMetadata(info);
}
JSFunction::EnsureLiterals(info->closure());
TimerEventScope<TimerEventRecompileSynchronous> timer(info->isolate());
RuntimeCallTimerScope runtimeTimer(info->isolate(),
&RuntimeCallStats::RecompileSynchronous);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"),
"V8.RecompileSynchronous");
if (job->PrepareJob() != CompilationJob::SUCCEEDED) return false;
isolate->optimizing_compile_dispatcher()->QueueForOptimization(job);
if (FLAG_trace_concurrent_recompilation) {
PrintF(" ** Queued ");
info->closure()->ShortPrint();
PrintF(" for concurrent optimization.\n");
}
return true;
}
MaybeHandle<Code> GetOptimizedCode(Handle<JSFunction> function,
Compiler::ConcurrencyMode mode,
BailoutId osr_ast_id = BailoutId::None(),
JavaScriptFrame* osr_frame = nullptr) {
Isolate* isolate = function->GetIsolate();
Handle<SharedFunctionInfo> shared(function->shared(), isolate);
bool ignition_osr = osr_frame && osr_frame->is_interpreted();
DCHECK_IMPLIES(ignition_osr, !osr_ast_id.IsNone());
DCHECK_IMPLIES(ignition_osr, FLAG_ignition_osr);
// Flag combination --ignition-osr --no-turbo-from-bytecode is unsupported.
if (ignition_osr && !FLAG_turbo_from_bytecode) return MaybeHandle<Code>();
Handle<Code> cached_code;
// TODO(4764): When compiling for OSR from bytecode, BailoutId might derive
// from bytecode offset and overlap with actual BailoutId. No lookup!
if (!ignition_osr &&
GetCodeFromOptimizedCodeMap(function, osr_ast_id)
.ToHandle(&cached_code)) {
if (FLAG_trace_opt) {
PrintF("[found optimized code for ");
function->ShortPrint();
if (!osr_ast_id.IsNone()) {
PrintF(" at OSR AST id %d", osr_ast_id.ToInt());
}
PrintF("]\n");
}
return cached_code;
}
// Reset profiler ticks, function is no longer considered hot.
if (shared->is_compiled()) {
shared->code()->set_profiler_ticks(0);
}
VMState<COMPILER> state(isolate);
DCHECK(!isolate->has_pending_exception());
PostponeInterruptsScope postpone(isolate);
bool use_turbofan = UseTurboFan(shared) || ignition_osr;
std::unique_ptr<CompilationJob> job(
use_turbofan ? compiler::Pipeline::NewCompilationJob(function)
: new HCompilationJob(function));
CompilationInfo* info = job->info();
ParseInfo* parse_info = info->parse_info();
info->SetOptimizingForOsr(osr_ast_id, osr_frame);
// Do not use Crankshaft/TurboFan if we need to be able to set break points.
if (info->shared_info()->HasDebugInfo()) {
info->AbortOptimization(kFunctionBeingDebugged);
return MaybeHandle<Code>();
}
// Limit the number of times we try to optimize functions.
const int kMaxOptCount =
FLAG_deopt_every_n_times == 0 ? FLAG_max_opt_count : 1000;
if (info->shared_info()->opt_count() > kMaxOptCount) {
info->AbortOptimization(kOptimizedTooManyTimes);
return MaybeHandle<Code>();
}
TimerEventScope<TimerEventOptimizeCode> optimize_code_timer(isolate);
RuntimeCallTimerScope runtimeTimer(isolate, &RuntimeCallStats::OptimizeCode);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), "V8.OptimizeCode");
// TurboFan can optimize directly from existing bytecode.
if (FLAG_turbo_from_bytecode && use_turbofan && ShouldUseIgnition(info)) {
if (info->is_osr() && !ignition_osr) return MaybeHandle<Code>();
if (!Compiler::EnsureBytecode(info)) {
if (isolate->has_pending_exception()) isolate->clear_pending_exception();
return MaybeHandle<Code>();
}
info->MarkAsOptimizeFromBytecode();
}
// Verify that OSR compilations are delegated to the correct graph builder.
// Depending on the underlying frame the semantics of the {BailoutId} differ
// and the various graph builders hard-code a certain semantic:
// - Interpreter : The BailoutId represents a bytecode offset.
// - FullCodegen : The BailoutId represents the id of an AST node.
DCHECK_IMPLIES(info->is_osr() && ignition_osr,
info->is_optimizing_from_bytecode());
DCHECK_IMPLIES(info->is_osr() && !ignition_osr,
!info->is_optimizing_from_bytecode());
// In case of concurrent recompilation, all handles below this point will be
// allocated in a deferred handle scope that is detached and handed off to
// the background thread when we return.
std::unique_ptr<CompilationHandleScope> compilation;
if (mode == Compiler::CONCURRENT) {
compilation.reset(new CompilationHandleScope(info));
}
// In case of TurboFan, all handles below will be canonicalized.
std::unique_ptr<CanonicalHandleScope> canonical;
if (use_turbofan) canonical.reset(new CanonicalHandleScope(info->isolate()));
// Reopen handles in the new CompilationHandleScope.
info->ReopenHandlesInNewHandleScope();
parse_info->ReopenHandlesInNewHandleScope();
if (mode == Compiler::CONCURRENT) {
if (GetOptimizedCodeLater(job.get())) {
job.release(); // The background recompile job owns this now.
return isolate->builtins()->InOptimizationQueue();
}
} else {
if (GetOptimizedCodeNow(job.get())) return info->code();
}
if (isolate->has_pending_exception()) isolate->clear_pending_exception();
return MaybeHandle<Code>();
}
CompilationJob::Status FinalizeOptimizedCompilationJob(CompilationJob* job) {
CompilationInfo* info = job->info();
Isolate* isolate = info->isolate();
TimerEventScope<TimerEventRecompileSynchronous> timer(info->isolate());
RuntimeCallTimerScope runtimeTimer(isolate,
&RuntimeCallStats::RecompileSynchronous);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"),
"V8.RecompileSynchronous");
Handle<SharedFunctionInfo> shared = info->shared_info();
shared->code()->set_profiler_ticks(0);
DCHECK(!shared->HasDebugInfo());
// 1) Optimization on the concurrent thread may have failed.
// 2) The function may have already been optimized by OSR. Simply continue.
// Except when OSR already disabled optimization for some reason.
// 3) The code may have already been invalidated due to dependency change.
// 4) Code generation may have failed.
if (job->state() == CompilationJob::State::kReadyToFinalize) {
if (shared->optimization_disabled()) {
job->RetryOptimization(kOptimizationDisabled);
} else if (info->dependencies()->HasAborted()) {
job->RetryOptimization(kBailedOutDueToDependencyChange);
} else if (job->FinalizeJob() == CompilationJob::SUCCEEDED) {
job->RecordOptimizedCompilationStats();
RecordFunctionCompilation(CodeEventListener::LAZY_COMPILE_TAG, info);
if (shared
->SearchOptimizedCodeMap(info->context()->native_context(),
info->osr_ast_id())
.code == nullptr) {
InsertCodeIntoOptimizedCodeMap(info);
}
if (FLAG_trace_opt) {
PrintF("[completed optimizing ");
info->closure()->ShortPrint();
PrintF("]\n");
}
info->closure()->ReplaceCode(*info->code());
return CompilationJob::SUCCEEDED;
}
}
DCHECK(job->state() == CompilationJob::State::kFailed);
if (FLAG_trace_opt) {
PrintF("[aborted optimizing ");
info->closure()->ShortPrint();
PrintF(" because: %s]\n", GetBailoutReason(info->bailout_reason()));
}
info->closure()->ReplaceCode(shared->code());
return CompilationJob::FAILED;
}
class InterpreterActivationsFinder : public ThreadVisitor,
public OptimizedFunctionVisitor {
public:
explicit InterpreterActivationsFinder(SharedFunctionInfo* shared)
: shared_(shared), has_activations_(false) {}
void VisitThread(Isolate* isolate, ThreadLocalTop* top) {
Address* activation_pc_address = nullptr;
JavaScriptFrameIterator it(isolate, top);
for (; !it.done(); it.Advance()) {
JavaScriptFrame* frame = it.frame();
if (FLAG_turbo_from_bytecode && FLAG_ignition_osr &&
frame->is_optimized() && frame->function()->shared() == shared_) {
// If we are able to optimize functions directly from bytecode, then
// there might be optimized OSR code active on the stack that is not
// reachable through a function. We count this as an activation.
has_activations_ = true;
}
if (frame->is_interpreted() && frame->function()->shared() == shared_) {
has_activations_ = true;
activation_pc_address = frame->pc_address();
}
}
if (activation_pc_address) {
activation_pc_addresses_.push_back(activation_pc_address);
}
}
void VisitFunction(JSFunction* function) {
if (function->Inlines(shared_)) has_activations_ = true;
}
void EnterContext(Context* context) {}
void LeaveContext(Context* context) {}
bool MarkActivationsForBaselineOnReturn(Isolate* isolate) {
if (activation_pc_addresses_.empty()) return false;
for (Address* activation_pc_address : activation_pc_addresses_) {
DCHECK(isolate->inner_pointer_to_code_cache()
->GetCacheEntry(*activation_pc_address)
->code->is_interpreter_trampoline_builtin());
*activation_pc_address =
isolate->builtins()->InterpreterMarkBaselineOnReturn()->entry();
}
return true;
}
bool has_activations() { return has_activations_; }
private:
SharedFunctionInfo* shared_;
bool has_activations_;
std::vector<Address*> activation_pc_addresses_;
};
bool HasInterpreterActivations(
Isolate* isolate, InterpreterActivationsFinder* activations_finder) {
activations_finder->VisitThread(isolate, isolate->thread_local_top());
isolate->thread_manager()->IterateArchivedThreads(activations_finder);
if (FLAG_turbo_from_bytecode) {
// If we are able to optimize functions directly from bytecode, then there
// might be optimized functions that rely on bytecode being around. We need
// to prevent switching the given function to baseline code in those cases.
Deoptimizer::VisitAllOptimizedFunctions(isolate, activations_finder);
}
return activations_finder->has_activations();
}
MaybeHandle<Code> GetBaselineCode(Handle<JSFunction> function) {
Isolate* isolate = function->GetIsolate();
VMState<COMPILER> state(isolate);
PostponeInterruptsScope postpone(isolate);
Zone zone(isolate->allocator(), ZONE_NAME);
ParseInfo parse_info(&zone, handle(function->shared()));
CompilationInfo info(&parse_info, function);
// Reset profiler ticks, function is no longer considered hot.
if (function->shared()->HasBytecodeArray()) {
function->shared()->set_profiler_ticks(0);
}
// Nothing left to do if the function already has baseline code.
if (function->shared()->code()->kind() == Code::FUNCTION) {
return Handle<Code>(function->shared()->code());
}
// We do not switch to baseline code when the debugger might have created a
// copy of the bytecode with break slots to be able to set break points.
if (function->shared()->HasDebugInfo()) {
return MaybeHandle<Code>();
}
// TODO(4280): For now we do not switch generators or async functions to
// baseline code because there might be suspended activations stored in
// generator objects on the heap. We could eventually go directly to
// TurboFan in this case.
if (IsResumableFunction(function->shared()->kind())) {
return MaybeHandle<Code>();
}
// TODO(4280): For now we disable switching to baseline code in the presence
// of interpreter activations of the given function. The reasons is that the
// underlying bytecode is cleared below. Note that this only applies in case
// the --ignition-preserve-bytecode flag is not passed.
if (!FLAG_ignition_preserve_bytecode) {
InterpreterActivationsFinder activations_finder(function->shared());
if (HasInterpreterActivations(isolate, &activations_finder)) {
if (FLAG_trace_opt) {
OFStream os(stdout);
os << "[unable to switch " << Brief(*function) << " due to activations]"
<< std::endl;
}
if (activations_finder.MarkActivationsForBaselineOnReturn(isolate)) {
if (FLAG_trace_opt) {
OFStream os(stdout);
os << "[marking " << Brief(function->shared())
<< " for baseline recompilation on return]" << std::endl;
}
}
return MaybeHandle<Code>();
}
}
if (FLAG_trace_opt) {
OFStream os(stdout);
os << "[switching method " << Brief(*function) << " to baseline code]"
<< std::endl;
}
// Parse and update CompilationInfo with the results.
if (!Parse(info.parse_info())) return MaybeHandle<Code>();
Handle<SharedFunctionInfo> shared = info.shared_info();
DCHECK_EQ(shared->language_mode(), info.literal()->language_mode());
// Compile baseline code using the full code generator.
if (!Compiler::Analyze(info.parse_info()) ||
!FullCodeGenerator::MakeCode(&info)) {
if (!isolate->has_pending_exception()) isolate->StackOverflow();
return MaybeHandle<Code>();
}
// TODO(4280): For now we play it safe and remove the bytecode array when we
// switch to baseline code. We might consider keeping around the bytecode so
// that it can be used as the "source of truth" eventually. Note that this
// only applies in case the --ignition-preserve-bytecode flag is not passed.
if (!FLAG_ignition_preserve_bytecode) shared->ClearBytecodeArray();
// Update the shared function info with the scope info.
InstallSharedScopeInfo(&info, shared);
// Install compilation result on the shared function info
InstallSharedCompilationResult(&info, shared);
// Record the function compilation event.
RecordFunctionCompilation(CodeEventListener::LAZY_COMPILE_TAG, &info);
return info.code();
}
MaybeHandle<Code> GetLazyCode(Handle<JSFunction> function) {
Isolate* isolate = function->GetIsolate();
DCHECK(!isolate->has_pending_exception());
DCHECK(!function->is_compiled());
TimerEventScope<TimerEventCompileCode> compile_timer(isolate);
RuntimeCallTimerScope runtimeTimer(isolate,
&RuntimeCallStats::CompileCodeLazy);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), "V8.CompileCode");
AggregatedHistogramTimerScope timer(isolate->counters()->compile_lazy());
Handle<Code> cached_code;
if (GetCodeFromOptimizedCodeMap(function, BailoutId::None())
.ToHandle(&cached_code)) {
if (FLAG_trace_opt) {
PrintF("[found optimized code for ");
function->ShortPrint();
PrintF(" during unoptimized compile]\n");
}
DCHECK(function->shared()->is_compiled());
return cached_code;
}
if (function->shared()->is_compiled()) {
return Handle<Code>(function->shared()->code());
}
if (function->shared()->HasBytecodeArray()) {
Handle<Code> entry = isolate->builtins()->InterpreterEntryTrampoline();
function->shared()->ReplaceCode(*entry);
return entry;
}
Zone zone(isolate->allocator(), ZONE_NAME);
ParseInfo parse_info(&zone, handle(function->shared()));
CompilationInfo info(&parse_info, function);
Handle<Code> result;
ASSIGN_RETURN_ON_EXCEPTION(isolate, result, GetUnoptimizedCode(&info), Code);
if (FLAG_always_opt) {
Handle<Code> opt_code;
if (GetOptimizedCode(function, Compiler::NOT_CONCURRENT)
.ToHandle(&opt_code)) {
result = opt_code;