-
-
Notifications
You must be signed in to change notification settings - Fork 36.9k
Expand file tree
/
Copy pathnode_buffer.cc
More file actions
1952 lines (1643 loc) · 65.8 KB
/
Copy pathnode_buffer.cc
File metadata and controls
1952 lines (1643 loc) · 65.8 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 Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#include "node_buffer.h"
#include "node.h"
#include "node_blob.h"
#include "node_debug.h"
#include "node_errors.h"
#include "node_external_reference.h"
#include "node_i18n.h"
#include "node_internals.h"
#include "env-inl.h"
#include "simdutf.h"
#include "string_bytes.h"
#include "util-inl.h"
#include "v8-fast-api-calls.h"
#include "v8.h"
#include <stdint.h>
#include <climits>
#include <cstring>
#include "nbytes.h"
#define THROW_AND_RETURN_UNLESS_BUFFER(env, obj) \
THROW_AND_RETURN_IF_NOT_BUFFER(env, obj, "argument") \
#define THROW_AND_RETURN_IF_OOB(r) \
do { \
Maybe<bool> m = (r); \
if (m.IsNothing()) return; \
if (!m.FromJust()) \
return node::THROW_ERR_OUT_OF_RANGE(env, "Index out of range"); \
} while (0) \
namespace node {
namespace Buffer {
using v8::ArrayBuffer;
using v8::ArrayBufferView;
using v8::BackingStore;
using v8::BackingStoreInitializationMode;
using v8::BackingStoreOnFailureMode;
using v8::CFunction;
using v8::Context;
using v8::EscapableHandleScope;
using v8::FastApiCallbackOptions;
using v8::FastOneByteString;
using v8::FunctionCallbackInfo;
using v8::Global;
using v8::HandleScope;
using v8::Int32;
using v8::Integer;
using v8::Isolate;
using v8::Just;
using v8::Local;
using v8::Maybe;
using v8::MaybeLocal;
using v8::Nothing;
using v8::Number;
using v8::Object;
using v8::SharedArrayBuffer;
using v8::String;
using v8::Uint32;
using v8::Uint8Array;
using v8::Value;
namespace {
class CallbackInfo : public Cleanable {
public:
static inline MaybeLocal<ArrayBuffer> CreateTrackedArrayBuffer(
Environment* env,
char* data,
size_t length,
FreeCallback callback,
void* hint);
CallbackInfo(const CallbackInfo&) = delete;
CallbackInfo& operator=(const CallbackInfo&) = delete;
private:
void Clean() override;
inline void OnBackingStoreFree();
inline void CallAndResetCallback();
inline CallbackInfo(Environment* env,
FreeCallback callback,
char* data,
void* hint);
Global<ArrayBuffer> persistent_;
Mutex mutex_; // Protects callback_.
FreeCallback callback_;
char* const data_;
void* const hint_;
Environment* const env_;
};
MaybeLocal<ArrayBuffer> CallbackInfo::CreateTrackedArrayBuffer(
Environment* env,
char* data,
size_t length,
FreeCallback callback,
void* hint) {
CHECK_NOT_NULL(callback);
CHECK_IMPLIES(data == nullptr, length == 0);
CallbackInfo* self = new CallbackInfo(env, callback, data, hint);
std::unique_ptr<BackingStore> bs = AdoptIntoBackingStore(
env->isolate(),
data,
length,
[](void*, size_t, void* arg) {
static_cast<CallbackInfo*>(arg)->OnBackingStoreFree();
},
self);
if (!bs) {
THROW_ERR_MEMORY_ALLOCATION_FAILED(env);
return MaybeLocal<ArrayBuffer>();
}
Local<ArrayBuffer> ab = ArrayBuffer::New(env->isolate(), std::move(bs));
// V8 simply ignores the BackingStore deleter callback if data == nullptr,
// but our API contract requires it being called.
if (data == nullptr) {
ab->Detach(Local<Value>()).Check();
self->OnBackingStoreFree(); // This calls `callback` asynchronously.
} else if (ab->Data() == data) {
// Store the ArrayBuffer so that we can detach it later.
self->persistent_.Reset(env->isolate(), ab);
self->persistent_.SetWeak();
}
return ab;
}
CallbackInfo::CallbackInfo(Environment* env,
FreeCallback callback,
char* data,
void* hint)
: callback_(callback),
data_(data),
hint_(hint),
env_(env) {
env->cleanable_queue()->PushFront(this);
env->external_memory_accounter()->Increase(env->isolate(), sizeof(*this));
}
void CallbackInfo::Clean() {
{
HandleScope handle_scope(env_->isolate());
Local<ArrayBuffer> ab = persistent_.Get(env_->isolate());
if (!ab.IsEmpty() && ab->IsDetachable()) {
ab->Detach(Local<Value>()).Check();
persistent_.Reset();
}
}
// Call the callback in this case, but don't delete `this` yet because the
// BackingStore deleter callback will do so later.
CallAndResetCallback();
}
void CallbackInfo::CallAndResetCallback() {
FreeCallback callback;
{
Mutex::ScopedLock lock(mutex_);
callback = callback_;
callback_ = nullptr;
}
if (callback != nullptr) {
// Clean up all Environment-related state and run the callback.
cleanable_queue_.Remove();
env_->external_memory_accounter()->Decrease(env_->isolate(), sizeof(*this));
callback(data_, hint_);
}
}
void CallbackInfo::OnBackingStoreFree() {
// This method should always release the memory for `this`.
std::unique_ptr<CallbackInfo> self { this };
Mutex::ScopedLock lock(mutex_);
// If callback_ == nullptr, that means that the callback has already run from
// the cleanup hook, and there is nothing left to do here besides to clean
// up the memory involved. In particular, the underlying `Environment` may
// be gone at this point, so don’t attempt to call SetImmediateThreadsafe().
if (callback_ == nullptr) return;
env_->SetImmediateThreadsafe([self = std::move(self)](Environment* env) {
CHECK_EQ(self->env_, env); // Consistency check.
self->CallAndResetCallback();
});
}
// Parse index for external array data. An empty Maybe indicates
// a pending exception. `false` indicates that the index is out-of-bounds.
inline MUST_USE_RESULT Maybe<bool> ParseArrayIndex(Environment* env,
Local<Value> arg,
size_t def,
size_t* ret) {
if (arg->IsUndefined()) {
*ret = def;
return Just(true);
}
int64_t tmp_i;
if (!arg->IntegerValue(env->context()).To(&tmp_i))
return Nothing<bool>();
if (tmp_i < 0)
return Just(false);
// Check that the result fits in a size_t.
// coverity[pointless_expression]
if (static_cast<uint64_t>(tmp_i) > std::numeric_limits<size_t>::max())
return Just(false);
*ret = static_cast<size_t>(tmp_i);
return Just(true);
}
} // anonymous namespace
// Buffer methods
bool HasInstance(Local<Value> val) {
return val->IsArrayBufferView();
}
bool HasInstance(Local<Object> obj) {
return obj->IsArrayBufferView();
}
char* Data(Local<Value> val) {
CHECK(val->IsArrayBufferView());
Local<ArrayBufferView> ui = val.As<ArrayBufferView>();
return static_cast<char*>(ui->Buffer()->Data()) + ui->ByteOffset();
}
char* Data(Local<Object> obj) {
return Data(obj.As<Value>());
}
size_t Length(Local<Value> val) {
CHECK(val->IsArrayBufferView());
Local<ArrayBufferView> ui = val.As<ArrayBufferView>();
return ui->ByteLength();
}
size_t Length(Local<Object> obj) {
CHECK(obj->IsArrayBufferView());
Local<ArrayBufferView> ui = obj.As<ArrayBufferView>();
return ui->ByteLength();
}
MaybeLocal<Uint8Array> New(Environment* env,
Local<ArrayBuffer> ab,
size_t byte_offset,
size_t length) {
CHECK(!env->buffer_prototype_object().IsEmpty());
Local<Uint8Array> ui = Uint8Array::New(ab, byte_offset, length);
if (ui->SetPrototypeV2(env->context(), env->buffer_prototype_object())
.IsNothing()) {
return MaybeLocal<Uint8Array>();
}
return ui;
}
MaybeLocal<Uint8Array> New(Isolate* isolate,
Local<ArrayBuffer> ab,
size_t byte_offset,
size_t length) {
Environment* env = Environment::GetCurrent(isolate);
if (env == nullptr) {
THROW_ERR_BUFFER_CONTEXT_NOT_AVAILABLE(isolate);
return MaybeLocal<Uint8Array>();
}
return New(env, ab, byte_offset, length);
}
MaybeLocal<Object> New(Isolate* isolate,
Local<String> string,
enum encoding enc) {
EscapableHandleScope scope(isolate);
size_t length;
if (!StringBytes::Size(isolate, string, enc).To(&length)) return {};
size_t actual = 0;
std::unique_ptr<BackingStore> store;
if (length > 0) {
store = ArrayBuffer::NewBackingStore(
isolate,
length,
BackingStoreInitializationMode::kZeroInitialized,
BackingStoreOnFailureMode::kReturnNull);
if (!store) [[unlikely]] {
THROW_ERR_MEMORY_ALLOCATION_FAILED(isolate);
return {};
}
actual = StringBytes::Write(
isolate,
static_cast<char*>(store->Data()),
length,
string,
enc);
CHECK(actual <= length);
if (actual > 0) [[likely]] {
if (actual < length) {
std::unique_ptr<BackingStore> old_store = std::move(store);
store = ArrayBuffer::NewBackingStore(
isolate,
actual,
BackingStoreInitializationMode::kUninitialized,
BackingStoreOnFailureMode::kReturnNull);
if (!store) [[unlikely]] {
THROW_ERR_MEMORY_ALLOCATION_FAILED(isolate);
return {};
}
memcpy(store->Data(), old_store->Data(), actual);
}
Local<ArrayBuffer> buf = ArrayBuffer::New(isolate, std::move(store));
Local<Object> obj;
if (!New(isolate, buf, 0, actual).ToLocal(&obj)) [[unlikely]] {
return {};
}
return scope.Escape(obj);
}
}
return scope.EscapeMaybe(New(isolate, 0));
}
MaybeLocal<Object> New(Isolate* isolate, size_t length) {
EscapableHandleScope handle_scope(isolate);
Local<Object> obj;
Environment* env = Environment::GetCurrent(isolate);
if (env == nullptr) {
THROW_ERR_BUFFER_CONTEXT_NOT_AVAILABLE(isolate);
return MaybeLocal<Object>();
}
if (Buffer::New(env, length).ToLocal(&obj))
return handle_scope.Escape(obj);
return Local<Object>();
}
MaybeLocal<Object> New(Environment* env, size_t length) {
Isolate* isolate(env->isolate());
EscapableHandleScope scope(isolate);
// V8 currently only allows a maximum Typed Array index of max Smi.
if (length > kMaxLength) {
isolate->ThrowException(ERR_BUFFER_TOO_LARGE(isolate));
return Local<Object>();
}
Local<ArrayBuffer> ab;
{
std::unique_ptr<BackingStore> bs = ArrayBuffer::NewBackingStore(
isolate,
length,
BackingStoreInitializationMode::kUninitialized,
BackingStoreOnFailureMode::kReturnNull);
if (!bs) [[unlikely]] {
THROW_ERR_MEMORY_ALLOCATION_FAILED(isolate);
return {};
}
CHECK(bs);
ab = ArrayBuffer::New(isolate, std::move(bs));
}
MaybeLocal<Object> obj =
New(env, ab, 0, ab->ByteLength())
.FromMaybe(Local<Uint8Array>());
return scope.EscapeMaybe(obj);
}
MaybeLocal<Object> Copy(Isolate* isolate, const char* data, size_t length) {
EscapableHandleScope handle_scope(isolate);
Environment* env = Environment::GetCurrent(isolate);
if (env == nullptr) {
THROW_ERR_BUFFER_CONTEXT_NOT_AVAILABLE(isolate);
return MaybeLocal<Object>();
}
Local<Object> obj;
if (Buffer::Copy(env, data, length).ToLocal(&obj))
return handle_scope.Escape(obj);
return Local<Object>();
}
MaybeLocal<Object> Copy(Environment* env, const char* data, size_t length) {
Isolate* isolate(env->isolate());
EscapableHandleScope scope(isolate);
// V8 currently only allows a maximum Typed Array index of max Smi.
if (length > kMaxLength) {
isolate->ThrowException(ERR_BUFFER_TOO_LARGE(isolate));
return Local<Object>();
}
std::unique_ptr<BackingStore> bs = ArrayBuffer::NewBackingStore(
isolate,
length,
BackingStoreInitializationMode::kUninitialized,
BackingStoreOnFailureMode::kReturnNull);
if (!bs) [[unlikely]] {
THROW_ERR_MEMORY_ALLOCATION_FAILED(isolate);
return {};
}
if (length > 0) memcpy(bs->Data(), data, length);
Local<ArrayBuffer> ab = ArrayBuffer::New(isolate, std::move(bs));
MaybeLocal<Object> obj =
New(env, ab, 0, ab->ByteLength())
.FromMaybe(Local<Uint8Array>());
return scope.EscapeMaybe(obj);
}
MaybeLocal<Object> New(Isolate* isolate,
char* data,
size_t length,
FreeCallback callback,
void* hint) {
EscapableHandleScope handle_scope(isolate);
Environment* env = Environment::GetCurrent(isolate);
if (env == nullptr) {
callback(data, hint);
THROW_ERR_BUFFER_CONTEXT_NOT_AVAILABLE(isolate);
return MaybeLocal<Object>();
}
return handle_scope.EscapeMaybe(
Buffer::New(env, data, length, callback, hint));
}
MaybeLocal<Object> New(Environment* env,
char* data,
size_t length,
FreeCallback callback,
void* hint) {
EscapableHandleScope scope(env->isolate());
if (length > kMaxLength) {
env->isolate()->ThrowException(ERR_BUFFER_TOO_LARGE(env->isolate()));
callback(data, hint);
return Local<Object>();
}
Local<ArrayBuffer> ab;
if (!CallbackInfo::CreateTrackedArrayBuffer(env, data, length, callback, hint)
.ToLocal(&ab) ||
ab->SetPrivate(env->context(),
env->untransferable_object_private_symbol(),
True(env->isolate()))
.IsNothing()) {
return Local<Object>();
}
MaybeLocal<Uint8Array> maybe_ui = Buffer::New(env, ab, 0, length);
Local<Uint8Array> ui;
if (!maybe_ui.ToLocal(&ui))
return MaybeLocal<Object>();
return scope.Escape(ui);
}
// Warning: This function needs `data` to be allocated with malloc() and not
// necessarily isolate's ArrayBuffer::Allocator.
MaybeLocal<Object> New(Isolate* isolate, char* data, size_t length) {
EscapableHandleScope handle_scope(isolate);
Environment* env = Environment::GetCurrent(isolate);
if (env == nullptr) {
free(data);
THROW_ERR_BUFFER_CONTEXT_NOT_AVAILABLE(isolate);
return MaybeLocal<Object>();
}
Local<Object> obj;
if (Buffer::New(env, data, length).ToLocal(&obj))
return handle_scope.Escape(obj);
return Local<Object>();
}
// The contract for this function is that `data` is allocated with malloc()
// and not necessarily isolate's ArrayBuffer::Allocator.
MaybeLocal<Object> New(Environment* env,
char* data,
size_t length) {
if (length > 0) {
CHECK_NOT_NULL(data);
// V8 currently only allows a maximum Typed Array index of max Smi.
if (length > kMaxLength) {
Isolate* isolate(env->isolate());
isolate->ThrowException(ERR_BUFFER_TOO_LARGE(isolate));
free(data);
return Local<Object>();
}
}
EscapableHandleScope handle_scope(env->isolate());
std::unique_ptr<BackingStore> bs = AdoptIntoBackingStore(
env->isolate(),
data,
length,
[](void* data, size_t, void*) { free(data); },
nullptr);
if (!bs) {
THROW_ERR_MEMORY_ALLOCATION_FAILED(env);
return MaybeLocal<Object>();
}
Local<ArrayBuffer> ab = ArrayBuffer::New(env->isolate(), std::move(bs));
Local<Object> obj;
if (Buffer::New(env, ab, 0, length).ToLocal(&obj))
return handle_scope.Escape(obj);
return Local<Object>();
}
namespace {
template <encoding encoding>
void StringSlice(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
THROW_AND_RETURN_UNLESS_BUFFER(env, args[0]);
ArrayBufferViewContents<char> buffer(args[0]);
auto buffer_length = buffer.length();
const char* data_ptr = buffer.data();
Local<ArrayBufferView> view = args[0].As<ArrayBufferView>();
if (buffer_length == 0) return args.GetReturnValue().SetEmptyString();
size_t start = 0;
size_t end = 0;
THROW_AND_RETURN_IF_OOB(ParseArrayIndex(env, args[1], 0, &start));
THROW_AND_RETURN_IF_OOB(ParseArrayIndex(env, args[2], buffer_length, &end));
if (end <= start) return args.GetReturnValue().SetEmptyString();
THROW_AND_RETURN_IF_OOB(Just(end <= buffer_length));
size_t length = end - start;
std::unique_ptr<char[]> data_copy;
if (view->Buffer()->IsSharedArrayBuffer()) {
data_copy = std::make_unique_for_overwrite<char[]>(length);
memcpy(data_copy.get(), data_ptr + start, length);
data_ptr = data_copy.get();
start = 0;
}
Local<Value> ret;
if (StringBytes::Encode(isolate, data_ptr + start, length, encoding)
.ToLocal(&ret)) {
args.GetReturnValue().Set(ret);
}
}
// Returns the number of bytes actually copied. This is normally |to_copy|, but
// V8 copies nothing (and returns 0) when the target is backed by a detached or
// immutable ArrayBuffer.
size_t CopyImpl(Local<Value> source_obj,
Local<Value> target_obj,
const size_t target_start,
const size_t source_start,
const size_t to_copy) {
Local<ArrayBufferView> source = source_obj.As<ArrayBufferView>();
Local<ArrayBufferView> target = target_obj.As<ArrayBufferView>();
Local<ArrayBuffer> source_ab = source->Buffer();
Local<ArrayBuffer> target_ab = target->Buffer();
const size_t source_offset = source->ByteOffset() + source_start;
const size_t target_offset = target->ByteOffset() + target_start;
// Defer byte-range clamping and detached/immutable handling to V8. When both
// sides are backed by a SharedArrayBuffer the relaxed atomic overload is
// used, which honors the SharedArrayBuffer memory model. Any other
// combination (both regular, or one of each) goes through the ArrayBuffer
// overload: it operates on the underlying backing store regardless of
// shared-ness, so a plain memmove is performed (matching the historical
// behavior for SharedArrayBuffer-backed buffers). The V8 API has no overload
// that mixes ArrayBuffer and SharedArrayBuffer, so the two must never be
// cross-cast.
if (source_ab->IsSharedArrayBuffer() && target_ab->IsSharedArrayBuffer()) {
return source_ab.As<SharedArrayBuffer>()->CopyArrayBufferBytes(
source_offset,
to_copy,
target_ab.As<SharedArrayBuffer>(),
target_offset);
}
return source_ab->CopyArrayBufferBytes(
source_offset, to_copy, target_ab, target_offset);
}
// Assume caller has properly validated args.
void SlowCopy(const FunctionCallbackInfo<Value>& args) {
Local<Value> source_obj = args[0];
Local<Value> target_obj = args[1];
// Byte offsets and lengths can exceed uint32 for buffers larger than 4 GiB,
// so they are passed and returned as doubles (exact for integers < 2^53).
const size_t target_start =
static_cast<size_t>(args[2].As<Number>()->Value());
const size_t source_start =
static_cast<size_t>(args[3].As<Number>()->Value());
const size_t to_copy = static_cast<size_t>(args[4].As<Number>()->Value());
const size_t copied =
CopyImpl(source_obj, target_obj, target_start, source_start, to_copy);
args.GetReturnValue().Set(static_cast<double>(copied));
}
// Assume caller has properly validated args.
double FastCopy(Local<Value> receiver,
Local<Value> source_obj,
Local<Value> target_obj,
double target_start,
double source_start,
double to_copy,
// NOLINTNEXTLINE(runtime/references)
FastApiCallbackOptions& options) {
TRACK_V8_FAST_API_CALL("buffer.copy");
HandleScope scope(options.isolate);
return static_cast<double>(CopyImpl(source_obj,
target_obj,
static_cast<size_t>(target_start),
static_cast<size_t>(source_start),
static_cast<size_t>(to_copy)));
}
static CFunction fast_copy(CFunction::Make(FastCopy));
void Fill(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Local<Context> ctx = env->context();
THROW_AND_RETURN_UNLESS_BUFFER(env, args[0]);
SPREAD_BUFFER_ARG(args[0], ts_obj);
size_t start = 0;
THROW_AND_RETURN_IF_OOB(ParseArrayIndex(env, args[2], 0, &start));
size_t end;
THROW_AND_RETURN_IF_OOB(ParseArrayIndex(env, args[3], 0, &end));
size_t fill_length = end - start;
Local<String> str_obj;
size_t str_length;
enum encoding enc;
// OOB Check. Throw the error in JS.
if (start > end || fill_length + start > ts_obj_length)
return args.GetReturnValue().Set(-2);
// First check if Buffer has been passed.
if (Buffer::HasInstance(args[1])) {
SPREAD_BUFFER_ARG(args[1], fill_obj);
str_length = fill_obj_length;
memcpy(
ts_obj_data + start, fill_obj_data, std::min(str_length, fill_length));
goto start_fill;
}
// Then coerce everything that's not a string.
if (!args[1]->IsString()) {
uint32_t val;
if (!args[1]->Uint32Value(ctx).To(&val)) return;
int value = val & 255;
memset(ts_obj_data + start, value, fill_length);
return;
}
if (!args[1]->ToString(env->context()).ToLocal(&str_obj)) {
return;
}
enc = ParseEncoding(env->isolate(), args[4], UTF8);
// Can't use StringBytes::Write() in all cases. For example if attempting
// to write a two byte character into a one byte Buffer.
if (enc == UTF8) {
str_length = str_obj->Utf8LengthV2(env->isolate());
node::Utf8Value str(env->isolate(), args[1]);
memcpy(ts_obj_data + start, *str, std::min(str_length, fill_length));
} else if (enc == UCS2) {
str_length = str_obj->Length() * sizeof(uint16_t);
node::TwoByteValue str(env->isolate(), args[1]);
if constexpr (IsBigEndian())
CHECK(nbytes::SwapBytes16(reinterpret_cast<char*>(&str[0]), str_length));
memcpy(ts_obj_data + start, *str, std::min(str_length, fill_length));
} else {
// Write initial String to Buffer, then use that memory to copy remainder
// of string. Correct the string length for cases like HEX where less than
// the total string length is written.
str_length = StringBytes::Write(
env->isolate(), ts_obj_data + start, fill_length, str_obj, enc);
}
start_fill:
if (str_length >= fill_length)
return;
// If str_length is zero, then either an empty buffer was provided, or Write()
// indicated that no bytes could be written. If no bytes could be written,
// then return -1 because the fill value is invalid. This will trigger a throw
// in JavaScript. Silently failing should be avoided because it can lead to
// buffers with unexpected contents.
if (str_length == 0)
return args.GetReturnValue().Set(-1);
size_t in_there = str_length;
char* ptr = ts_obj_data + start + str_length;
while (in_there < fill_length - in_there) {
memcpy(ptr, ts_obj_data + start, in_there);
ptr += in_there;
in_there *= 2;
}
if (in_there < fill_length) {
memcpy(ptr, ts_obj_data + start, fill_length - in_there);
}
}
template <encoding encoding>
void StringWrite(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
THROW_AND_RETURN_UNLESS_BUFFER(env, args[0]);
SPREAD_BUFFER_ARG(args[0], ts_obj);
THROW_AND_RETURN_IF_NOT_STRING(env, args[1], "argument");
Local<String> str;
if (!args[1]->ToString(env->context()).ToLocal(&str)) {
return;
}
size_t offset = 0;
size_t max_length = 0;
THROW_AND_RETURN_IF_OOB(ParseArrayIndex(env, args[2], 0, &offset));
if (offset > ts_obj_length) {
return node::THROW_ERR_BUFFER_OUT_OF_BOUNDS(
env, "\"offset\" is outside of buffer bounds");
}
THROW_AND_RETURN_IF_OOB(
ParseArrayIndex(env, args[3], ts_obj_length - offset, &max_length));
max_length = std::min(ts_obj_length - offset, max_length);
if (max_length == 0)
return args.GetReturnValue().Set(0);
uint32_t written = StringBytes::Write(
env->isolate(), ts_obj_data + offset, max_length, str, encoding);
args.GetReturnValue().Set(written);
}
void SlowByteLengthUtf8(const FunctionCallbackInfo<Value>& args) {
CHECK(args[0]->IsString());
Isolate* isolate = args.GetIsolate();
Local<String> str = args[0].As<String>();
// Below ~512 units, or for one-byte, V8's Utf8LengthV2 is faster.
if (str->Length() >= 512 && !str->IsOneByte()) {
String::ValueView view(isolate, str);
if (!view.is_one_byte()) {
// with_replacement matches Buffer.from's U+FFFD for lone surrogates.
size_t result =
simdutf::utf8_length_from_utf16_with_replacement(
reinterpret_cast<const char16_t*>(view.data16()), view.length())
.count;
args.GetReturnValue().Set(static_cast<uint64_t>(result));
return;
}
}
args.GetReturnValue().Set(static_cast<uint64_t>(str->Utf8LengthV2(isolate)));
}
uint32_t FastByteLengthUtf8(
Local<Value> receiver,
Local<Value> sourceValue,
FastApiCallbackOptions& options) { // NOLINT(runtime/references)
TRACK_V8_FAST_API_CALL("Buffer::FastByteLengthUtf8");
auto isolate = options.isolate;
HandleScope handleScope(isolate);
CHECK(sourceValue->IsString());
Local<String> sourceStr = sourceValue.As<String>();
if (!sourceStr->IsExternalOneByte()) {
// Below ~512 units, or for one-byte, V8's Utf8LengthV2 is faster.
if (sourceStr->Length() >= 512 && !sourceStr->IsOneByte()) {
String::ValueView view(isolate, sourceStr);
if (!view.is_one_byte()) {
// with_replacement matches Buffer.from's U+FFFD for lone surrogates.
return simdutf::utf8_length_from_utf16_with_replacement(
reinterpret_cast<const char16_t*>(view.data16()),
view.length())
.count;
}
}
return sourceStr->Utf8LengthV2(isolate);
}
auto source = sourceStr->GetExternalOneByteStringResource();
// For short inputs, the function call overhead to simdutf is maybe
// not worth it, reserve simdutf for long strings.
if (source->length() > 128) {
return simdutf::utf8_length_from_latin1(source->data(), source->length());
}
uint32_t length = source->length();
const auto input = reinterpret_cast<const uint8_t*>(source->data());
uint32_t answer = length;
uint32_t i = 0;
auto pop = [](uint64_t v) {
return static_cast<size_t>(((v >> 7) & UINT64_C(0x0101010101010101)) *
UINT64_C(0x0101010101010101) >>
56);
};
for (; i + 32 <= length; i += 32) {
uint64_t v;
memcpy(&v, input + i, 8);
answer += pop(v);
memcpy(&v, input + i + 8, 8);
answer += pop(v);
memcpy(&v, input + i + 16, 8);
answer += pop(v);
memcpy(&v, input + i + 24, 8);
answer += pop(v);
}
for (; i + 8 <= length; i += 8) {
uint64_t v;
memcpy(&v, input + i, 8);
answer += pop(v);
}
for (; i + 1 <= length; i += 1) {
answer += input[i] >> 7;
}
return answer;
}
static CFunction fast_byte_length_utf8(CFunction::Make(FastByteLengthUtf8));
// Normalize val to be an integer in the range of [1, -1] since
// implementations of memcmp() can vary by platform.
static int normalizeCompareVal(int val, size_t a_length, size_t b_length) {
if (val == 0) {
if (a_length > b_length)
return 1;
else if (a_length < b_length)
return -1;
} else {
if (val > 0)
return 1;
else
return -1;
}
return val;
}
void CompareOffset(const FunctionCallbackInfo<Value> &args) {
Environment* env = Environment::GetCurrent(args);
THROW_AND_RETURN_UNLESS_BUFFER(env, args[0]);
THROW_AND_RETURN_UNLESS_BUFFER(env, args[1]);
ArrayBufferViewContents<char> source(args[0]);
ArrayBufferViewContents<char> target(args[1]);
size_t target_start = 0;
size_t source_start = 0;
size_t source_end = 0;
size_t target_end = 0;
THROW_AND_RETURN_IF_OOB(ParseArrayIndex(env, args[2], 0, &target_start));
THROW_AND_RETURN_IF_OOB(ParseArrayIndex(env, args[3], 0, &source_start));
THROW_AND_RETURN_IF_OOB(ParseArrayIndex(env, args[4], target.length(),
&target_end));
THROW_AND_RETURN_IF_OOB(ParseArrayIndex(env, args[5], source.length(),
&source_end));
if (source_start > source.length())
return THROW_ERR_OUT_OF_RANGE(
env, "The value of \"sourceStart\" is out of range.");
if (target_start > target.length())
return THROW_ERR_OUT_OF_RANGE(
env, "The value of \"targetStart\" is out of range.");
CHECK_LE(source_start, source_end);
CHECK_LE(target_start, target_end);
size_t to_cmp =
std::min(std::min(source_end - source_start, target_end - target_start),
source.length() - source_start);
int val = normalizeCompareVal(to_cmp > 0 ?
memcmp(source.data() + source_start,
target.data() + target_start,
to_cmp) : 0,
source_end - source_start,
target_end - target_start);
args.GetReturnValue().Set(val);
}
int32_t CompareImpl(Local<Value> a_obj, Local<Value> b_obj) {
ArrayBufferViewContents<char> a(a_obj);
ArrayBufferViewContents<char> b(b_obj);
size_t cmp_length = std::min(a.length(), b.length());
return normalizeCompareVal(
cmp_length > 0 ? memcmp(a.data(), b.data(), cmp_length) : 0,
a.length(),
b.length());
}
void Compare(const FunctionCallbackInfo<Value> &args) {
Environment* env = Environment::GetCurrent(args);
THROW_AND_RETURN_UNLESS_BUFFER(env, args[0]);
THROW_AND_RETURN_UNLESS_BUFFER(env, args[1]);
int val = CompareImpl(args[0], args[1]);
args.GetReturnValue().Set(val);
}
int32_t FastCompare(Local<Value>,
Local<Value> a_obj,
Local<Value> b_obj,
// NOLINTNEXTLINE(runtime/references)
FastApiCallbackOptions& options) {
HandleScope scope(options.isolate);
return CompareImpl(a_obj, b_obj);
}
static CFunction fast_compare(CFunction::Make(FastCompare));
// Computes the offset for starting an indexOf or lastIndexOf search.
// Returns either a valid offset in [0...<length - 1>], ie inside the Buffer,
// or -1 to signal that there is no possible match.
int64_t IndexOfOffset(size_t length,
int64_t offset_i64,
int64_t needle_length,
bool is_forward) {
int64_t length_i64 = static_cast<int64_t>(length);
if (offset_i64 < 0) {