forked from nodejs/node
-
Notifications
You must be signed in to change notification settings - Fork 5
/
env.cc
1990 lines (1727 loc) · 74.6 KB
/
env.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
#include "env.h"
#include "async_wrap.h"
#include "base_object-inl.h"
#include "debug_utils-inl.h"
#include "diagnosticfilename-inl.h"
#include "memory_tracker-inl.h"
#include "node_buffer.h"
#include "node_context_data.h"
#include "node_contextify.h"
#include "node_errors.h"
#include "node_internals.h"
#include "node_options-inl.h"
#include "node_process-inl.h"
#include "node_shadow_realm.h"
#include "node_v8_platform-inl.h"
#include "node_worker.h"
#include "req_wrap-inl.h"
#include "stream_base.h"
#include "tracing/agent.h"
#include "tracing/traced_value.h"
#include "util-inl.h"
#include "v8-cppgc.h"
#include "v8-profiler.h"
#include <algorithm>
#include <atomic>
#include <cinttypes>
#include <cstdio>
#include <iostream>
#include <limits>
#include <memory>
#include <unordered_map>
namespace node {
using errors::TryCatchScope;
using v8::Array;
using v8::Boolean;
using v8::Context;
using v8::EmbedderGraph;
using v8::EscapableHandleScope;
using v8::Function;
using v8::HandleScope;
using v8::HeapProfiler;
using v8::HeapSpaceStatistics;
using v8::Integer;
using v8::Isolate;
using v8::Local;
using v8::MaybeLocal;
using v8::NewStringType;
using v8::Number;
using v8::Object;
using v8::ObjectTemplate;
using v8::Private;
using v8::Script;
using v8::SnapshotCreator;
using v8::StackTrace;
using v8::String;
using v8::Symbol;
using v8::TracingController;
using v8::TryCatch;
using v8::Undefined;
using v8::Value;
using worker::Worker;
int const ContextEmbedderTag::kNodeContextTag = 0x6e6f64;
void* const ContextEmbedderTag::kNodeContextTagPtr = const_cast<void*>(
static_cast<const void*>(&ContextEmbedderTag::kNodeContextTag));
void AsyncHooks::ResetPromiseHooks(Local<Function> init,
Local<Function> before,
Local<Function> after,
Local<Function> resolve) {
js_promise_hooks_[0].Reset(env()->isolate(), init);
js_promise_hooks_[1].Reset(env()->isolate(), before);
js_promise_hooks_[2].Reset(env()->isolate(), after);
js_promise_hooks_[3].Reset(env()->isolate(), resolve);
}
void Environment::ResetPromiseHooks(Local<Function> init,
Local<Function> before,
Local<Function> after,
Local<Function> resolve) {
async_hooks()->ResetPromiseHooks(init, before, after, resolve);
for (auto it = contexts_.begin(); it != contexts_.end(); it++) {
if (it->IsEmpty()) {
contexts_.erase(it--);
continue;
}
PersistentToLocal::Weak(isolate_, *it)
->SetPromiseHooks(init, before, after, resolve);
}
}
// Remember to keep this code aligned with pushAsyncContext() in JS.
void AsyncHooks::push_async_context(double async_id,
double trigger_async_id,
Local<Object> resource) {
// Since async_hooks is experimental, do only perform the check
// when async_hooks is enabled.
if (fields_[kCheck] > 0) {
CHECK_GE(async_id, -1);
CHECK_GE(trigger_async_id, -1);
}
uint32_t offset = fields_[kStackLength];
if (offset * 2 >= async_ids_stack_.Length()) grow_async_ids_stack();
async_ids_stack_[2 * offset] = async_id_fields_[kExecutionAsyncId];
async_ids_stack_[2 * offset + 1] = async_id_fields_[kTriggerAsyncId];
fields_[kStackLength] += 1;
async_id_fields_[kExecutionAsyncId] = async_id;
async_id_fields_[kTriggerAsyncId] = trigger_async_id;
#ifdef DEBUG
for (uint32_t i = offset; i < native_execution_async_resources_.size(); i++)
CHECK(native_execution_async_resources_[i].IsEmpty());
#endif
// When this call comes from JS (as a way of increasing the stack size),
// `resource` will be empty, because JS caches these values anyway.
if (!resource.IsEmpty()) {
native_execution_async_resources_.resize(offset + 1);
// Caveat: This is a v8::Local<> assignment, we do not keep a v8::Global<>!
native_execution_async_resources_[offset] = resource;
}
}
// Remember to keep this code aligned with popAsyncContext() in JS.
bool AsyncHooks::pop_async_context(double async_id) {
// In case of an exception then this may have already been reset, if the
// stack was multiple MakeCallback()'s deep.
if (UNLIKELY(fields_[kStackLength] == 0)) return false;
// Ask for the async_id to be restored as a check that the stack
// hasn't been corrupted.
if (UNLIKELY(fields_[kCheck] > 0 &&
async_id_fields_[kExecutionAsyncId] != async_id)) {
FailWithCorruptedAsyncStack(async_id);
}
uint32_t offset = fields_[kStackLength] - 1;
async_id_fields_[kExecutionAsyncId] = async_ids_stack_[2 * offset];
async_id_fields_[kTriggerAsyncId] = async_ids_stack_[2 * offset + 1];
fields_[kStackLength] = offset;
if (LIKELY(offset < native_execution_async_resources_.size() &&
!native_execution_async_resources_[offset].IsEmpty())) {
#ifdef DEBUG
for (uint32_t i = offset + 1; i < native_execution_async_resources_.size();
i++) {
CHECK(native_execution_async_resources_[i].IsEmpty());
}
#endif
native_execution_async_resources_.resize(offset);
if (native_execution_async_resources_.size() <
native_execution_async_resources_.capacity() / 2 &&
native_execution_async_resources_.size() > 16) {
native_execution_async_resources_.shrink_to_fit();
}
}
if (UNLIKELY(js_execution_async_resources()->Length() > offset)) {
HandleScope handle_scope(env()->isolate());
USE(js_execution_async_resources()->Set(
env()->context(),
env()->length_string(),
Integer::NewFromUnsigned(env()->isolate(), offset)));
}
return fields_[kStackLength] > 0;
}
void AsyncHooks::clear_async_id_stack() {
if (!js_execution_async_resources_.IsEmpty() && env()->can_call_into_js()) {
Isolate* isolate = env()->isolate();
HandleScope handle_scope(isolate);
USE(PersistentToLocal::Strong(js_execution_async_resources_)
->Set(env()->context(),
env()->length_string(),
Integer::NewFromUnsigned(isolate, 0)));
}
native_execution_async_resources_.clear();
native_execution_async_resources_.shrink_to_fit();
async_id_fields_[kExecutionAsyncId] = 0;
async_id_fields_[kTriggerAsyncId] = 0;
fields_[kStackLength] = 0;
}
void AsyncHooks::InstallPromiseHooks(Local<Context> ctx) {
ctx->SetPromiseHooks(js_promise_hooks_[0].IsEmpty()
? Local<Function>()
: PersistentToLocal::Strong(js_promise_hooks_[0]),
js_promise_hooks_[1].IsEmpty()
? Local<Function>()
: PersistentToLocal::Strong(js_promise_hooks_[1]),
js_promise_hooks_[2].IsEmpty()
? Local<Function>()
: PersistentToLocal::Strong(js_promise_hooks_[2]),
js_promise_hooks_[3].IsEmpty()
? Local<Function>()
: PersistentToLocal::Strong(js_promise_hooks_[3]));
}
void Environment::TrackContext(Local<Context> context) {
size_t id = contexts_.size();
contexts_.resize(id + 1);
contexts_[id].Reset(isolate_, context);
contexts_[id].SetWeak();
}
void Environment::UntrackContext(Local<Context> context) {
HandleScope handle_scope(isolate_);
contexts_.erase(std::remove_if(contexts_.begin(),
contexts_.end(),
[&](auto&& el) { return el.IsEmpty(); }),
contexts_.end());
for (auto it = contexts_.begin(); it != contexts_.end(); it++) {
Local<Context> saved_context = PersistentToLocal::Weak(isolate_, *it);
if (saved_context == context) {
it->Reset();
contexts_.erase(it);
break;
}
}
}
void Environment::TrackShadowRealm(shadow_realm::ShadowRealm* realm) {
shadow_realms_.insert(realm);
}
void Environment::UntrackShadowRealm(shadow_realm::ShadowRealm* realm) {
shadow_realms_.erase(realm);
}
AsyncHooks::DefaultTriggerAsyncIdScope::DefaultTriggerAsyncIdScope(
Environment* env, double default_trigger_async_id)
: async_hooks_(env->async_hooks()) {
if (env->async_hooks()->fields()[AsyncHooks::kCheck] > 0) {
CHECK_GE(default_trigger_async_id, 0);
}
old_default_trigger_async_id_ =
async_hooks_->async_id_fields()[AsyncHooks::kDefaultTriggerAsyncId];
async_hooks_->async_id_fields()[AsyncHooks::kDefaultTriggerAsyncId] =
default_trigger_async_id;
}
AsyncHooks::DefaultTriggerAsyncIdScope::~DefaultTriggerAsyncIdScope() {
async_hooks_->async_id_fields()[AsyncHooks::kDefaultTriggerAsyncId] =
old_default_trigger_async_id_;
}
AsyncHooks::DefaultTriggerAsyncIdScope::DefaultTriggerAsyncIdScope(
AsyncWrap* async_wrap)
: DefaultTriggerAsyncIdScope(async_wrap->env(),
async_wrap->get_async_id()) {}
std::ostream& operator<<(std::ostream& output,
const std::vector<SnapshotIndex>& v) {
output << "{ ";
for (const SnapshotIndex i : v) {
output << i << ", ";
}
output << " }";
return output;
}
std::ostream& operator<<(std::ostream& output,
const IsolateDataSerializeInfo& i) {
output << "{\n"
<< "// -- primitive begins --\n"
<< i.primitive_values << ",\n"
<< "// -- primitive ends --\n"
<< "// -- template_values begins --\n"
<< i.template_values << ",\n"
<< "// -- template_values ends --\n"
<< "}";
return output;
}
std::ostream& operator<<(std::ostream& output, const SnapshotMetadata& i) {
output << "{\n"
<< " "
<< (i.type == SnapshotMetadata::Type::kDefault
? "SnapshotMetadata::Type::kDefault"
: "SnapshotMetadata::Type::kFullyCustomized")
<< ", // type\n"
<< " \"" << i.node_version << "\", // node_version\n"
<< " \"" << i.node_arch << "\", // node_arch\n"
<< " \"" << i.node_platform << "\", // node_platform\n"
<< " " << i.v8_cache_version_tag << ", // v8_cache_version_tag\n"
<< "}";
return output;
}
IsolateDataSerializeInfo IsolateData::Serialize(SnapshotCreator* creator) {
Isolate* isolate = creator->GetIsolate();
IsolateDataSerializeInfo info;
HandleScope handle_scope(isolate);
// XXX(joyeecheung): technically speaking, the indexes here should be
// consecutive and we could just return a range instead of an array,
// but that's not part of the V8 API contract so we use an array
// just to be safe.
#define VP(PropertyName, StringValue) V(Private, PropertyName)
#define VY(PropertyName, StringValue) V(Symbol, PropertyName)
#define VS(PropertyName, StringValue) V(String, PropertyName)
#define VR(PropertyName, TypeName) V(Private, per_realm_##PropertyName)
#define V(TypeName, PropertyName) \
info.primitive_values.push_back( \
creator->AddData(PropertyName##_.Get(isolate)));
PER_ISOLATE_PRIVATE_SYMBOL_PROPERTIES(VP)
PER_ISOLATE_SYMBOL_PROPERTIES(VY)
PER_ISOLATE_STRING_PROPERTIES(VS)
PER_REALM_STRONG_PERSISTENT_VALUES(VR)
#undef V
#undef VR
#undef VY
#undef VS
#undef VP
for (size_t i = 0; i < AsyncWrap::PROVIDERS_LENGTH; i++)
info.primitive_values.push_back(creator->AddData(async_wrap_provider(i)));
uint32_t id = 0;
#define VM(PropertyName) V(PropertyName##_binding_template, ObjectTemplate)
#define V(PropertyName, TypeName) \
do { \
Local<TypeName> field = PropertyName(); \
if (!field.IsEmpty()) { \
size_t index = creator->AddData(field); \
info.template_values.push_back({#PropertyName, id, index}); \
} \
id++; \
} while (0);
PER_ISOLATE_TEMPLATE_PROPERTIES(V)
NODE_BINDINGS_WITH_PER_ISOLATE_INIT(VM)
#undef V
return info;
}
void IsolateData::DeserializeProperties(const IsolateDataSerializeInfo* info) {
size_t i = 0;
HandleScope handle_scope(isolate_);
if (per_process::enabled_debug_list.enabled(DebugCategory::MKSNAPSHOT)) {
fprintf(stderr, "deserializing IsolateDataSerializeInfo...\n");
std::cerr << *info << "\n";
}
#define VP(PropertyName, StringValue) V(Private, PropertyName)
#define VY(PropertyName, StringValue) V(Symbol, PropertyName)
#define VS(PropertyName, StringValue) V(String, PropertyName)
#define VR(PropertyName, TypeName) V(Private, per_realm_##PropertyName)
#define V(TypeName, PropertyName) \
do { \
MaybeLocal<TypeName> maybe_field = \
isolate_->GetDataFromSnapshotOnce<TypeName>( \
info->primitive_values[i++]); \
Local<TypeName> field; \
if (!maybe_field.ToLocal(&field)) { \
fprintf(stderr, "Failed to deserialize " #PropertyName "\n"); \
} \
PropertyName##_.Set(isolate_, field); \
} while (0);
PER_ISOLATE_PRIVATE_SYMBOL_PROPERTIES(VP)
PER_ISOLATE_SYMBOL_PROPERTIES(VY)
PER_ISOLATE_STRING_PROPERTIES(VS)
PER_REALM_STRONG_PERSISTENT_VALUES(VR)
#undef V
#undef VR
#undef VY
#undef VS
#undef VP
for (size_t j = 0; j < AsyncWrap::PROVIDERS_LENGTH; j++) {
MaybeLocal<String> maybe_field =
isolate_->GetDataFromSnapshotOnce<String>(info->primitive_values[i++]);
Local<String> field;
if (!maybe_field.ToLocal(&field)) {
fprintf(stderr, "Failed to deserialize AsyncWrap provider %zu\n", j);
}
async_wrap_providers_[j].Set(isolate_, field);
}
const std::vector<PropInfo>& values = info->template_values;
i = 0; // index to the array
uint32_t id = 0;
#define VM(PropertyName) V(PropertyName##_binding_template, ObjectTemplate)
#define V(PropertyName, TypeName) \
do { \
if (values.size() > i && id == values[i].id) { \
const PropInfo& d = values[i]; \
DCHECK_EQ(d.name, #PropertyName); \
MaybeLocal<TypeName> maybe_field = \
isolate_->GetDataFromSnapshotOnce<TypeName>(d.index); \
Local<TypeName> field; \
if (!maybe_field.ToLocal(&field)) { \
fprintf(stderr, \
"Failed to deserialize isolate data template " #PropertyName \
"\n"); \
} \
set_##PropertyName(field); \
i++; \
} \
id++; \
} while (0);
PER_ISOLATE_TEMPLATE_PROPERTIES(V);
NODE_BINDINGS_WITH_PER_ISOLATE_INIT(VM);
#undef V
}
void IsolateData::CreateProperties() {
// Create string and private symbol properties as internalized one byte
// strings after the platform is properly initialized.
//
// Internalized because it makes property lookups a little faster and
// because the string is created in the old space straight away. It's going
// to end up in the old space sooner or later anyway but now it doesn't go
// through v8::Eternal's new space handling first.
//
// One byte because our strings are ASCII and we can safely skip V8's UTF-8
// decoding step.
HandleScope handle_scope(isolate_);
#define V(PropertyName, StringValue) \
PropertyName##_.Set( \
isolate_, \
Private::New(isolate_, \
String::NewFromOneByte( \
isolate_, \
reinterpret_cast<const uint8_t*>(StringValue), \
NewStringType::kInternalized, \
sizeof(StringValue) - 1) \
.ToLocalChecked()));
PER_ISOLATE_PRIVATE_SYMBOL_PROPERTIES(V)
#undef V
#define V(PropertyName, TypeName) \
per_realm_##PropertyName##_.Set( \
isolate_, \
Private::New( \
isolate_, \
String::NewFromOneByte( \
isolate_, \
reinterpret_cast<const uint8_t*>("per_realm_" #PropertyName), \
NewStringType::kInternalized, \
sizeof("per_realm_" #PropertyName) - 1) \
.ToLocalChecked()));
PER_REALM_STRONG_PERSISTENT_VALUES(V)
#undef V
#define V(PropertyName, StringValue) \
PropertyName##_.Set( \
isolate_, \
Symbol::New(isolate_, \
String::NewFromOneByte( \
isolate_, \
reinterpret_cast<const uint8_t*>(StringValue), \
NewStringType::kInternalized, \
sizeof(StringValue) - 1) \
.ToLocalChecked()));
PER_ISOLATE_SYMBOL_PROPERTIES(V)
#undef V
#define V(PropertyName, StringValue) \
PropertyName##_.Set( \
isolate_, \
String::NewFromOneByte(isolate_, \
reinterpret_cast<const uint8_t*>(StringValue), \
NewStringType::kInternalized, \
sizeof(StringValue) - 1) \
.ToLocalChecked());
PER_ISOLATE_STRING_PROPERTIES(V)
#undef V
// Create all the provider strings that will be passed to JS. Place them in
// an array so the array index matches the PROVIDER id offset. This way the
// strings can be retrieved quickly.
#define V(Provider) \
async_wrap_providers_[AsyncWrap::PROVIDER_ ## Provider].Set( \
isolate_, \
String::NewFromOneByte( \
isolate_, \
reinterpret_cast<const uint8_t*>(#Provider), \
NewStringType::kInternalized, \
sizeof(#Provider) - 1).ToLocalChecked());
NODE_ASYNC_PROVIDER_TYPES(V)
#undef V
Local<ObjectTemplate> templ = ObjectTemplate::New(isolate());
templ->SetInternalFieldCount(BaseObject::kInternalFieldCount);
set_binding_data_default_template(templ);
binding::CreateInternalBindingTemplates(this);
contextify::ContextifyContext::InitializeGlobalTemplates(this);
}
constexpr uint16_t kDefaultCppGCEmebdderID = 0x90de;
Mutex IsolateData::isolate_data_mutex_;
std::unordered_map<uint16_t, std::unique_ptr<PerIsolateWrapperData>>
IsolateData::wrapper_data_map_;
IsolateData::IsolateData(Isolate* isolate,
uv_loop_t* event_loop,
MultiIsolatePlatform* platform,
ArrayBufferAllocator* node_allocator,
const SnapshotData* snapshot_data)
: isolate_(isolate),
event_loop_(event_loop),
node_allocator_(node_allocator == nullptr ? nullptr
: node_allocator->GetImpl()),
platform_(platform),
snapshot_data_(snapshot_data) {
options_.reset(
new PerIsolateOptions(*(per_process::cli_options->per_isolate)));
v8::CppHeap* cpp_heap = isolate->GetCppHeap();
uint16_t cppgc_id = kDefaultCppGCEmebdderID;
if (cpp_heap != nullptr) {
// The general convention of the wrappable layout for cppgc in the
// ecosystem is:
// [ 0 ] -> embedder id
// [ 1 ] -> wrappable instance
// If the Isolate includes a CppHeap attached by another embedder,
// And if they also use the field 0 for the ID, we DCHECK that
// the layout matches our layout, and record the embedder ID for cppgc
// to avoid accidentally enabling cppgc on non-cppgc-managed wrappers .
v8::WrapperDescriptor descriptor = cpp_heap->wrapper_descriptor();
if (descriptor.wrappable_type_index == BaseObject::kEmbedderType) {
cppgc_id = descriptor.embedder_id_for_garbage_collected;
DCHECK_EQ(descriptor.wrappable_instance_index, BaseObject::kSlot);
}
// If the CppHeap uses the slot we use to put non-cppgc-traced BaseObject
// for embedder ID, V8 could accidentally enable cppgc on them. So
// safe guard against this.
DCHECK_NE(descriptor.wrappable_type_index, BaseObject::kSlot);
}
// We do not care about overflow since we just want this to be different
// from the cppgc id.
uint16_t non_cppgc_id = cppgc_id + 1;
{
// GC could still be run after the IsolateData is destroyed, so we store
// the ids in a static map to ensure pointers to them are still valid
// then. In practice there should be very few variants of the cppgc id
// in one process so the size of this map should be very small.
node::Mutex::ScopedLock lock(isolate_data_mutex_);
auto it = wrapper_data_map_.find(cppgc_id);
if (it == wrapper_data_map_.end()) {
auto pair = wrapper_data_map_.emplace(
cppgc_id, new PerIsolateWrapperData{cppgc_id, non_cppgc_id});
it = pair.first;
}
wrapper_data_ = it->second.get();
}
if (snapshot_data == nullptr) {
CreateProperties();
} else {
DeserializeProperties(&snapshot_data->isolate_data_info);
}
}
void IsolateData::MemoryInfo(MemoryTracker* tracker) const {
#define V(PropertyName, StringValue) \
tracker->TrackField(#PropertyName, PropertyName());
PER_ISOLATE_SYMBOL_PROPERTIES(V)
PER_ISOLATE_STRING_PROPERTIES(V)
#undef V
tracker->TrackField("async_wrap_providers", async_wrap_providers_);
if (node_allocator_ != nullptr) {
tracker->TrackFieldWithSize(
"node_allocator", sizeof(*node_allocator_), "NodeArrayBufferAllocator");
}
tracker->TrackFieldWithSize(
"platform", sizeof(*platform_), "MultiIsolatePlatform");
// TODO(joyeecheung): implement MemoryRetainer in the option classes.
}
void TrackingTraceStateObserver::UpdateTraceCategoryState() {
if (!env_->owns_process_state() || !env_->can_call_into_js()) {
// Ideally, we’d have a consistent story that treats all threads/Environment
// instances equally here. However, tracing is essentially global, and this
// callback is called from whichever thread calls `StartTracing()` or
// `StopTracing()`. The only way to do this in a threadsafe fashion
// seems to be only tracking this from the main thread, and only allowing
// these state modifications from the main thread.
return;
}
if (env_->principal_realm() == nullptr) {
return;
}
bool async_hooks_enabled = (*(TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(
TRACING_CATEGORY_NODE1(async_hooks)))) != 0;
Isolate* isolate = env_->isolate();
HandleScope handle_scope(isolate);
Local<Function> cb = env_->trace_category_state_function();
if (cb.IsEmpty())
return;
TryCatchScope try_catch(env_);
try_catch.SetVerbose(true);
Local<Value> args[] = {Boolean::New(isolate, async_hooks_enabled)};
USE(cb->Call(env_->context(), Undefined(isolate), arraysize(args), args));
}
void Environment::AssignToContext(Local<v8::Context> context,
Realm* realm,
const ContextInfo& info) {
context->SetAlignedPointerInEmbedderData(ContextEmbedderIndex::kEnvironment,
this);
context->SetAlignedPointerInEmbedderData(ContextEmbedderIndex::kRealm, realm);
// Used to retrieve bindings
context->SetAlignedPointerInEmbedderData(
ContextEmbedderIndex::kBindingDataStoreIndex,
realm != nullptr ? realm->binding_data_store() : nullptr);
// ContextifyContexts will update this to a pointer to the native object.
context->SetAlignedPointerInEmbedderData(
ContextEmbedderIndex::kContextifyContext, nullptr);
// This must not be done before other context fields are initialized.
ContextEmbedderTag::TagNodeContext(context);
#if HAVE_INSPECTOR
inspector_agent()->ContextCreated(context, info);
#endif // HAVE_INSPECTOR
this->async_hooks()->InstallPromiseHooks(context);
TrackContext(context);
}
void Environment::UnassignFromContext(Local<v8::Context> context) {
if (!context.IsEmpty()) {
context->SetAlignedPointerInEmbedderData(ContextEmbedderIndex::kEnvironment,
nullptr);
context->SetAlignedPointerInEmbedderData(ContextEmbedderIndex::kRealm,
nullptr);
context->SetAlignedPointerInEmbedderData(
ContextEmbedderIndex::kBindingDataStoreIndex, nullptr);
context->SetAlignedPointerInEmbedderData(
ContextEmbedderIndex::kContextifyContext, nullptr);
}
UntrackContext(context);
}
void Environment::TryLoadAddon(
const char* filename,
int flags,
const std::function<bool(binding::DLib*)>& was_loaded) {
loaded_addons_.emplace_back(filename, flags);
if (!was_loaded(&loaded_addons_.back())) {
loaded_addons_.pop_back();
}
}
std::string Environment::GetCwd() {
char cwd[PATH_MAX_BYTES];
size_t size = PATH_MAX_BYTES;
const int err = uv_cwd(cwd, &size);
if (err == 0) {
CHECK_GT(size, 0);
return cwd;
}
// This can fail if the cwd is deleted. In that case, fall back to
// exec_path.
const std::string& exec_path = exec_path_;
return exec_path.substr(0, exec_path.find_last_of(kPathSeparator));
}
void Environment::add_refs(int64_t diff) {
task_queues_async_refs_ += diff;
CHECK_GE(task_queues_async_refs_, 0);
if (task_queues_async_refs_ == 0)
uv_unref(reinterpret_cast<uv_handle_t*>(&task_queues_async_));
else
uv_ref(reinterpret_cast<uv_handle_t*>(&task_queues_async_));
}
uv_buf_t Environment::allocate_managed_buffer(const size_t suggested_size) {
NoArrayBufferZeroFillScope no_zero_fill_scope(isolate_data());
std::unique_ptr<v8::BackingStore> bs =
v8::ArrayBuffer::NewBackingStore(isolate(), suggested_size);
uv_buf_t buf = uv_buf_init(static_cast<char*>(bs->Data()), bs->ByteLength());
released_allocated_buffers_.emplace(buf.base, std::move(bs));
return buf;
}
std::unique_ptr<v8::BackingStore> Environment::release_managed_buffer(
const uv_buf_t& buf) {
std::unique_ptr<v8::BackingStore> bs;
if (buf.base != nullptr) {
auto it = released_allocated_buffers_.find(buf.base);
CHECK_NE(it, released_allocated_buffers_.end());
bs = std::move(it->second);
released_allocated_buffers_.erase(it);
}
return bs;
}
std::string GetExecPath(const std::vector<std::string>& argv) {
char exec_path_buf[2 * PATH_MAX];
size_t exec_path_len = sizeof(exec_path_buf);
std::string exec_path;
if (uv_exepath(exec_path_buf, &exec_path_len) == 0) {
exec_path = std::string(exec_path_buf, exec_path_len);
} else if (argv.size() > 0) {
exec_path = argv[0];
}
// On OpenBSD process.execPath will be relative unless we
// get the full path before process.execPath is used.
#if defined(__OpenBSD__)
uv_fs_t req;
req.ptr = nullptr;
if (0 ==
uv_fs_realpath(nullptr, &req, exec_path.c_str(), nullptr)) {
CHECK_NOT_NULL(req.ptr);
exec_path = std::string(static_cast<char*>(req.ptr));
}
uv_fs_req_cleanup(&req);
#endif
return exec_path;
}
Environment::Environment(IsolateData* isolate_data,
Isolate* isolate,
const std::vector<std::string>& args,
const std::vector<std::string>& exec_args,
const EnvSerializeInfo* env_info,
EnvironmentFlags::Flags flags,
ThreadId thread_id)
: isolate_(isolate),
isolate_data_(isolate_data),
async_hooks_(isolate, MAYBE_FIELD_PTR(env_info, async_hooks)),
immediate_info_(isolate, MAYBE_FIELD_PTR(env_info, immediate_info)),
timeout_info_(isolate_, 1, MAYBE_FIELD_PTR(env_info, timeout_info)),
tick_info_(isolate, MAYBE_FIELD_PTR(env_info, tick_info)),
timer_base_(uv_now(isolate_data->event_loop())),
exec_argv_(exec_args),
argv_(args),
exec_path_(GetExecPath(args)),
exit_info_(
isolate_, kExitInfoFieldCount, MAYBE_FIELD_PTR(env_info, exit_info)),
should_abort_on_uncaught_toggle_(
isolate_,
1,
MAYBE_FIELD_PTR(env_info, should_abort_on_uncaught_toggle)),
stream_base_state_(isolate_,
StreamBase::kNumStreamBaseStateFields,
MAYBE_FIELD_PTR(env_info, stream_base_state)),
time_origin_(performance::performance_process_start),
time_origin_timestamp_(performance::performance_process_start_timestamp),
environment_start_(PERFORMANCE_NOW()),
flags_(flags),
thread_id_(thread_id.id == static_cast<uint64_t>(-1)
? AllocateEnvironmentThreadId().id
: thread_id.id) {
constexpr bool is_shared_ro_heap =
#ifdef NODE_V8_SHARED_RO_HEAP
true;
#else
false;
#endif
if (is_shared_ro_heap && !is_main_thread()) {
// If this is a Worker thread and we are in shared-readonly-heap mode,
// we can always safely use the parent's Isolate's code cache.
CHECK_NOT_NULL(isolate_data->worker_context());
builtin_loader()->CopySourceAndCodeCacheReferenceFrom(
isolate_data->worker_context()->env()->builtin_loader());
} else if (isolate_data->snapshot_data() != nullptr) {
// ... otherwise, if a snapshot was provided, use its code cache.
builtin_loader()->RefreshCodeCache(
isolate_data->snapshot_data()->code_cache);
}
// We'll be creating new objects so make sure we've entered the context.
HandleScope handle_scope(isolate);
// Set some flags if only kDefaultFlags was passed. This can make API version
// transitions easier for embedders.
if (flags_ & EnvironmentFlags::kDefaultFlags) {
flags_ = flags_ |
EnvironmentFlags::kOwnsProcessState |
EnvironmentFlags::kOwnsInspector;
}
set_env_vars(per_process::system_environment);
enabled_debug_list_.Parse(env_vars(), isolate);
// We create new copies of the per-Environment option sets, so that it is
// easier to modify them after Environment creation. The defaults are
// part of the per-Isolate option set, for which in turn the defaults are
// part of the per-process option set.
options_ = std::make_shared<EnvironmentOptions>(
*isolate_data->options()->per_env);
inspector_host_port_ = std::make_shared<ExclusiveAccess<HostPort>>(
options_->debug_options().host_port);
heap_snapshot_near_heap_limit_ =
static_cast<uint32_t>(options_->heap_snapshot_near_heap_limit);
if (!(flags_ & EnvironmentFlags::kOwnsProcessState)) {
set_abort_on_uncaught_exception(false);
}
#if HAVE_INSPECTOR
// We can only create the inspector agent after having cloned the options.
inspector_agent_ = std::make_unique<inspector::Agent>(this);
#endif
if (tracing::AgentWriterHandle* writer = GetTracingAgentWriter()) {
trace_state_observer_ = std::make_unique<TrackingTraceStateObserver>(this);
if (TracingController* tracing_controller = writer->GetTracingController())
tracing_controller->AddTraceStateObserver(trace_state_observer_.get());
}
destroy_async_id_list_.reserve(512);
performance_state_ = std::make_unique<performance::PerformanceState>(
isolate, time_origin_, MAYBE_FIELD_PTR(env_info, performance_state));
if (*TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(
TRACING_CATEGORY_NODE1(environment)) != 0) {
auto traced_value = tracing::TracedValue::Create();
traced_value->BeginArray("args");
for (const std::string& arg : args) traced_value->AppendString(arg);
traced_value->EndArray();
traced_value->BeginArray("exec_args");
for (const std::string& arg : exec_args) traced_value->AppendString(arg);
traced_value->EndArray();
TRACE_EVENT_NESTABLE_ASYNC_BEGIN1(TRACING_CATEGORY_NODE1(environment),
"Environment",
this,
"args",
std::move(traced_value));
}
if (options_->experimental_permission) {
permission()->EnablePermissions();
// If any permission is set the process shouldn't be able to neither
// spawn/worker nor use addons or enable inspector
// unless explicitly allowed by the user
if (!options_->allow_fs_read.empty() || !options_->allow_fs_write.empty()) {
options_->allow_native_addons = false;
flags_ = flags_ | EnvironmentFlags::kNoCreateInspector;
permission()->Apply("*", permission::PermissionScope::kInspector);
if (!options_->allow_child_process) {
permission()->Apply("*", permission::PermissionScope::kChildProcess);
}
if (!options_->allow_worker_threads) {
permission()->Apply("*", permission::PermissionScope::kWorkerThreads);
}
}
if (!options_->allow_fs_read.empty()) {
permission()->Apply(options_->allow_fs_read,
permission::PermissionScope::kFileSystemRead);
}
if (!options_->allow_fs_write.empty()) {
permission()->Apply(options_->allow_fs_write,
permission::PermissionScope::kFileSystemWrite);
}
}
}
void Environment::InitializeMainContext(Local<Context> context,
const EnvSerializeInfo* env_info) {
principal_realm_ = std::make_unique<PrincipalRealm>(
this, context, MAYBE_FIELD_PTR(env_info, principal_realm));
if (env_info != nullptr) {
DeserializeProperties(env_info);
}
if (!options_->force_async_hooks_checks) {
async_hooks_.no_force_checks();
}
// By default, always abort when --abort-on-uncaught-exception was passed.
should_abort_on_uncaught_toggle_[0] = 1;
// The process is not exiting by default.
set_exiting(false);
performance_state_->Mark(performance::NODE_PERFORMANCE_MILESTONE_ENVIRONMENT,
environment_start_);
performance_state_->Mark(performance::NODE_PERFORMANCE_MILESTONE_NODE_START,
per_process::node_start_time);
if (per_process::v8_initialized) {
performance_state_->Mark(performance::NODE_PERFORMANCE_MILESTONE_V8_START,
performance::performance_v8_start);
}
}
Environment::~Environment() {
HandleScope handle_scope(isolate());
Local<Context> ctx = context();
if (Environment** interrupt_data = interrupt_data_.load()) {
// There are pending RequestInterrupt() callbacks. Tell them not to run,
// then force V8 to run interrupts by compiling and running an empty script
// so as not to leak memory.
*interrupt_data = nullptr;
Isolate::AllowJavascriptExecutionScope allow_js_here(isolate());
TryCatch try_catch(isolate());
Context::Scope context_scope(ctx);
#ifdef DEBUG
bool consistency_check = false;
isolate()->RequestInterrupt([](Isolate*, void* data) {
*static_cast<bool*>(data) = true;
}, &consistency_check);
#endif
Local<Script> script;
if (Script::Compile(ctx, String::Empty(isolate())).ToLocal(&script))
USE(script->Run(ctx));
DCHECK(consistency_check);
}
// FreeEnvironment() should have set this.
CHECK(is_stopping());
if (heapsnapshot_near_heap_limit_callback_added_) {
RemoveHeapSnapshotNearHeapLimitCallback(0);
}
isolate()->GetHeapProfiler()->RemoveBuildEmbedderGraphCallback(
BuildEmbedderGraph, this);
#if HAVE_INSPECTOR
// Destroy inspector agent before erasing the context. The inspector
// destructor depends on the context still being accessible.
inspector_agent_.reset();
#endif
// Sub-realms should have been cleared with Environment's cleanup.
DCHECK_EQ(shadow_realms_.size(), 0);
principal_realm_.reset();
if (trace_state_observer_) {
tracing::AgentWriterHandle* writer = GetTracingAgentWriter();
CHECK_NOT_NULL(writer);
if (TracingController* tracing_controller = writer->GetTracingController())
tracing_controller->RemoveTraceStateObserver(trace_state_observer_.get());
}
TRACE_EVENT_NESTABLE_ASYNC_END0(
TRACING_CATEGORY_NODE1(environment), "Environment", this);
// Do not unload addons on the main thread. Some addons need to retain memory
// beyond the Environment's lifetime, and unloading them early would break
// them; with Worker threads, we have the opportunity to be stricter.
// Also, since the main thread usually stops just before the process exits,
// this is far less relevant here.
if (!is_main_thread()) {
// Dereference all addons that were loaded into this environment.
for (binding::DLib& addon : loaded_addons_) {
addon.Close();
}
}
}
void Environment::InitializeLibuv() {
HandleScope handle_scope(isolate());
Context::Scope context_scope(context());
CHECK_EQ(0, uv_timer_init(event_loop(), timer_handle()));
uv_unref(reinterpret_cast<uv_handle_t*>(timer_handle()));
CHECK_EQ(0, uv_check_init(event_loop(), immediate_check_handle()));
uv_unref(reinterpret_cast<uv_handle_t*>(immediate_check_handle()));
CHECK_EQ(0, uv_idle_init(event_loop(), immediate_idle_handle()));
CHECK_EQ(0, uv_check_start(immediate_check_handle(), CheckImmediate));
// Inform V8's CPU profiler when we're idle. The profiler is sampling-based
// but not all samples are created equal; mark the wall clock time spent in
// epoll_wait() and friends so profiling tools can filter it out. The samples
// still end up in v8.log but with state=IDLE rather than state=EXTERNAL.
CHECK_EQ(0, uv_prepare_init(event_loop(), &idle_prepare_handle_));
CHECK_EQ(0, uv_check_init(event_loop(), &idle_check_handle_));