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
|
// 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.
#ifndef V8_API_H_
#define V8_API_H_
#include "include/v8-testing.h"
#include "src/contexts.h"
#include "src/debug/debug-interface.h"
#include "src/detachable-vector.h"
#include "src/heap/factory.h"
#include "src/isolate.h"
#include "src/objects/bigint.h"
#include "src/objects/js-collection.h"
#include "src/objects/js-promise.h"
#include "src/objects/module.h"
#include "src/objects/templates.h"
namespace v8 {
// Constants used in the implementation of the API. The most natural thing
// would usually be to place these with the classes that use them, but
// we want to keep them out of v8.h because it is an externally
// visible file.
class Consts {
public:
enum TemplateType {
FUNCTION_TEMPLATE = 0,
OBJECT_TEMPLATE = 1
};
};
template <typename T> inline T ToCData(v8::internal::Object* obj) {
STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
if (obj == v8::internal::Smi::kZero) return nullptr;
return reinterpret_cast<T>(
v8::internal::Foreign::cast(obj)->foreign_address());
}
template <>
inline v8::internal::Address ToCData(v8::internal::Object* obj) {
if (obj == v8::internal::Smi::kZero) return v8::internal::kNullAddress;
return v8::internal::Foreign::cast(obj)->foreign_address();
}
template <typename T>
inline v8::internal::Handle<v8::internal::Object> FromCData(
v8::internal::Isolate* isolate, T obj) {
STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
if (obj == nullptr) return handle(v8::internal::Smi::kZero, isolate);
return isolate->factory()->NewForeign(
reinterpret_cast<v8::internal::Address>(obj));
}
template <>
inline v8::internal::Handle<v8::internal::Object> FromCData(
v8::internal::Isolate* isolate, v8::internal::Address obj) {
if (obj == v8::internal::kNullAddress) {
return handle(v8::internal::Smi::kZero, isolate);
}
return isolate->factory()->NewForeign(obj);
}
class ApiFunction {
public:
explicit ApiFunction(v8::internal::Address addr) : addr_(addr) { }
v8::internal::Address address() { return addr_; }
private:
v8::internal::Address addr_;
};
class RegisteredExtension {
public:
explicit RegisteredExtension(Extension* extension);
static void Register(RegisteredExtension* that);
static void UnregisterAll();
Extension* extension() { return extension_; }
RegisteredExtension* next() { return next_; }
static RegisteredExtension* first_extension() { return first_extension_; }
private:
Extension* extension_;
RegisteredExtension* next_;
static RegisteredExtension* first_extension_;
};
#define OPEN_HANDLE_LIST(V) \
V(Template, TemplateInfo) \
V(FunctionTemplate, FunctionTemplateInfo) \
V(ObjectTemplate, ObjectTemplateInfo) \
V(Signature, FunctionTemplateInfo) \
V(AccessorSignature, FunctionTemplateInfo) \
V(Data, Object) \
V(RegExp, JSRegExp) \
V(Object, JSReceiver) \
V(Array, JSArray) \
V(Map, JSMap) \
V(Set, JSSet) \
V(ArrayBuffer, JSArrayBuffer) \
V(ArrayBufferView, JSArrayBufferView) \
V(TypedArray, JSTypedArray) \
V(Uint8Array, JSTypedArray) \
V(Uint8ClampedArray, JSTypedArray) \
V(Int8Array, JSTypedArray) \
V(Uint16Array, JSTypedArray) \
V(Int16Array, JSTypedArray) \
V(Uint32Array, JSTypedArray) \
V(Int32Array, JSTypedArray) \
V(Float32Array, JSTypedArray) \
V(Float64Array, JSTypedArray) \
V(DataView, JSDataView) \
V(SharedArrayBuffer, JSArrayBuffer) \
V(Name, Name) \
V(String, String) \
V(Symbol, Symbol) \
V(Script, JSFunction) \
V(UnboundModuleScript, SharedFunctionInfo) \
V(UnboundScript, SharedFunctionInfo) \
V(Module, Module) \
V(Function, JSReceiver) \
V(Message, JSMessageObject) \
V(Context, Context) \
V(External, Object) \
V(StackTrace, FixedArray) \
V(StackFrame, StackFrameInfo) \
V(Proxy, JSProxy) \
V(debug::GeneratorObject, JSGeneratorObject) \
V(debug::Script, Script) \
V(Promise, JSPromise) \
V(Primitive, Object) \
V(PrimitiveArray, FixedArray) \
V(BigInt, BigInt) \
V(ScriptOrModule, Script)
class Utils {
public:
static inline bool ApiCheck(bool condition,
const char* location,
const char* message) {
if (!condition) Utils::ReportApiFailure(location, message);
return condition;
}
static void ReportOOMFailure(v8::internal::Isolate* isolate,
const char* location, bool is_heap_oom);
static inline Local<Context> ToLocal(
v8::internal::Handle<v8::internal::Context> obj);
static inline Local<Value> ToLocal(
v8::internal::Handle<v8::internal::Object> obj);
static inline Local<Module> ToLocal(
v8::internal::Handle<v8::internal::Module> obj);
static inline Local<Name> ToLocal(
v8::internal::Handle<v8::internal::Name> obj);
static inline Local<String> ToLocal(
v8::internal::Handle<v8::internal::String> obj);
static inline Local<Symbol> ToLocal(
v8::internal::Handle<v8::internal::Symbol> obj);
static inline Local<RegExp> ToLocal(
v8::internal::Handle<v8::internal::JSRegExp> obj);
static inline Local<Object> ToLocal(
v8::internal::Handle<v8::internal::JSReceiver> obj);
static inline Local<Object> ToLocal(
v8::internal::Handle<v8::internal::JSObject> obj);
static inline Local<Function> ToLocal(
v8::internal::Handle<v8::internal::JSFunction> obj);
static inline Local<Array> ToLocal(
v8::internal::Handle<v8::internal::JSArray> obj);
static inline Local<Map> ToLocal(
v8::internal::Handle<v8::internal::JSMap> obj);
static inline Local<Set> ToLocal(
v8::internal::Handle<v8::internal::JSSet> obj);
static inline Local<Proxy> ToLocal(
v8::internal::Handle<v8::internal::JSProxy> obj);
static inline Local<ArrayBuffer> ToLocal(
v8::internal::Handle<v8::internal::JSArrayBuffer> obj);
static inline Local<ArrayBufferView> ToLocal(
v8::internal::Handle<v8::internal::JSArrayBufferView> obj);
static inline Local<DataView> ToLocal(
v8::internal::Handle<v8::internal::JSDataView> obj);
static inline Local<TypedArray> ToLocal(
v8::internal::Handle<v8::internal::JSTypedArray> obj);
static inline Local<Uint8Array> ToLocalUint8Array(
v8::internal::Handle<v8::internal::JSTypedArray> obj);
static inline Local<Uint8ClampedArray> ToLocalUint8ClampedArray(
v8::internal::Handle<v8::internal::JSTypedArray> obj);
static inline Local<Int8Array> ToLocalInt8Array(
v8::internal::Handle<v8::internal::JSTypedArray> obj);
static inline Local<Uint16Array> ToLocalUint16Array(
v8::internal::Handle<v8::internal::JSTypedArray> obj);
static inline Local<Int16Array> ToLocalInt16Array(
v8::internal::Handle<v8::internal::JSTypedArray> obj);
static inline Local<Uint32Array> ToLocalUint32Array(
v8::internal::Handle<v8::internal::JSTypedArray> obj);
static inline Local<Int32Array> ToLocalInt32Array(
v8::internal::Handle<v8::internal::JSTypedArray> obj);
static inline Local<Float32Array> ToLocalFloat32Array(
v8::internal::Handle<v8::internal::JSTypedArray> obj);
static inline Local<Float64Array> ToLocalFloat64Array(
v8::internal::Handle<v8::internal::JSTypedArray> obj);
static inline Local<BigInt64Array> ToLocalBigInt64Array(
v8::internal::Handle<v8::internal::JSTypedArray> obj);
static inline Local<BigUint64Array> ToLocalBigUint64Array(
v8::internal::Handle<v8::internal::JSTypedArray> obj);
static inline Local<SharedArrayBuffer> ToLocalShared(
v8::internal::Handle<v8::internal::JSArrayBuffer> obj);
static inline Local<Message> MessageToLocal(
v8::internal::Handle<v8::internal::Object> obj);
static inline Local<Promise> PromiseToLocal(
v8::internal::Handle<v8::internal::JSObject> obj);
static inline Local<StackTrace> StackTraceToLocal(
v8::internal::Handle<v8::internal::FixedArray> obj);
static inline Local<StackFrame> StackFrameToLocal(
v8::internal::Handle<v8::internal::StackFrameInfo> obj);
static inline Local<Number> NumberToLocal(
v8::internal::Handle<v8::internal::Object> obj);
static inline Local<Integer> IntegerToLocal(
v8::internal::Handle<v8::internal::Object> obj);
static inline Local<Uint32> Uint32ToLocal(
v8::internal::Handle<v8::internal::Object> obj);
static inline Local<BigInt> ToLocal(
v8::internal::Handle<v8::internal::BigInt> obj);
static inline Local<FunctionTemplate> ToLocal(
v8::internal::Handle<v8::internal::FunctionTemplateInfo> obj);
static inline Local<ObjectTemplate> ToLocal(
v8::internal::Handle<v8::internal::ObjectTemplateInfo> obj);
static inline Local<Signature> SignatureToLocal(
v8::internal::Handle<v8::internal::FunctionTemplateInfo> obj);
static inline Local<AccessorSignature> AccessorSignatureToLocal(
v8::internal::Handle<v8::internal::FunctionTemplateInfo> obj);
static inline Local<External> ExternalToLocal(
v8::internal::Handle<v8::internal::JSObject> obj);
static inline Local<Function> CallableToLocal(
v8::internal::Handle<v8::internal::JSReceiver> obj);
static inline Local<Primitive> ToLocalPrimitive(
v8::internal::Handle<v8::internal::Object> obj);
static inline Local<PrimitiveArray> ToLocal(
v8::internal::Handle<v8::internal::FixedArray> obj);
static inline Local<ScriptOrModule> ScriptOrModuleToLocal(
v8::internal::Handle<v8::internal::Script> obj);
#define DECLARE_OPEN_HANDLE(From, To) \
static inline v8::internal::Handle<v8::internal::To> \
OpenHandle(const From* that, bool allow_empty_handle = false);
OPEN_HANDLE_LIST(DECLARE_OPEN_HANDLE)
#undef DECLARE_OPEN_HANDLE
template<class From, class To>
static inline Local<To> Convert(v8::internal::Handle<From> obj) {
DCHECK(obj.is_null() || (obj->IsSmi() || !obj->IsTheHole()));
return Local<To>(reinterpret_cast<To*>(obj.location()));
}
template <class T>
static inline v8::internal::Handle<v8::internal::Object> OpenPersistent(
const v8::Persistent<T>& persistent) {
return v8::internal::Handle<v8::internal::Object>(
reinterpret_cast<v8::internal::Object**>(persistent.val_));
}
template <class T>
static inline v8::internal::Handle<v8::internal::Object> OpenPersistent(
v8::Persistent<T>* persistent) {
return OpenPersistent(*persistent);
}
template <class From, class To>
static inline v8::internal::Handle<To> OpenHandle(v8::Local<From> handle) {
return OpenHandle(*handle);
}
private:
static void ReportApiFailure(const char* location, const char* message);
};
template <class T>
inline T* ToApi(v8::internal::Handle<v8::internal::Object> obj) {
return reinterpret_cast<T*>(obj.location());
}
template <class T>
inline v8::Local<T> ToApiHandle(
v8::internal::Handle<v8::internal::Object> obj) {
return Utils::Convert<v8::internal::Object, T>(obj);
}
template <class T>
inline bool ToLocal(v8::internal::MaybeHandle<v8::internal::Object> maybe,
Local<T>* local) {
v8::internal::Handle<v8::internal::Object> handle;
if (maybe.ToHandle(&handle)) {
*local = Utils::Convert<v8::internal::Object, T>(handle);
return true;
}
return false;
}
// Implementations of ToLocal
#define MAKE_TO_LOCAL(Name, From, To) \
Local<v8::To> Utils::Name(v8::internal::Handle<v8::internal::From> obj) { \
return Convert<v8::internal::From, v8::To>(obj); \
}
#define MAKE_TO_LOCAL_TYPED_ARRAY(Type, typeName, TYPE, ctype, size) \
Local<v8::Type##Array> Utils::ToLocal##Type##Array( \
v8::internal::Handle<v8::internal::JSTypedArray> obj) { \
DCHECK(obj->type() == v8::internal::kExternal##Type##Array); \
return Convert<v8::internal::JSTypedArray, v8::Type##Array>(obj); \
}
MAKE_TO_LOCAL(ToLocal, Context, Context)
MAKE_TO_LOCAL(ToLocal, Object, Value)
MAKE_TO_LOCAL(ToLocal, Module, Module)
MAKE_TO_LOCAL(ToLocal, Name, Name)
MAKE_TO_LOCAL(ToLocal, String, String)
MAKE_TO_LOCAL(ToLocal, Symbol, Symbol)
MAKE_TO_LOCAL(ToLocal, JSRegExp, RegExp)
MAKE_TO_LOCAL(ToLocal, JSReceiver, Object)
MAKE_TO_LOCAL(ToLocal, JSObject, Object)
MAKE_TO_LOCAL(ToLocal, JSFunction, Function)
MAKE_TO_LOCAL(ToLocal, JSArray, Array)
MAKE_TO_LOCAL(ToLocal, JSMap, Map)
MAKE_TO_LOCAL(ToLocal, JSSet, Set)
MAKE_TO_LOCAL(ToLocal, JSProxy, Proxy)
MAKE_TO_LOCAL(ToLocal, JSArrayBuffer, ArrayBuffer)
MAKE_TO_LOCAL(ToLocal, JSArrayBufferView, ArrayBufferView)
MAKE_TO_LOCAL(ToLocal, JSDataView, DataView)
MAKE_TO_LOCAL(ToLocal, JSTypedArray, TypedArray)
MAKE_TO_LOCAL(ToLocalShared, JSArrayBuffer, SharedArrayBuffer)
TYPED_ARRAYS(MAKE_TO_LOCAL_TYPED_ARRAY)
MAKE_TO_LOCAL(ToLocal, FunctionTemplateInfo, FunctionTemplate)
MAKE_TO_LOCAL(ToLocal, ObjectTemplateInfo, ObjectTemplate)
MAKE_TO_LOCAL(SignatureToLocal, FunctionTemplateInfo, Signature)
MAKE_TO_LOCAL(AccessorSignatureToLocal, FunctionTemplateInfo, AccessorSignature)
MAKE_TO_LOCAL(MessageToLocal, Object, Message)
MAKE_TO_LOCAL(PromiseToLocal, JSObject, Promise)
MAKE_TO_LOCAL(StackTraceToLocal, FixedArray, StackTrace)
MAKE_TO_LOCAL(StackFrameToLocal, StackFrameInfo, StackFrame)
MAKE_TO_LOCAL(NumberToLocal, Object, Number)
MAKE_TO_LOCAL(IntegerToLocal, Object, Integer)
MAKE_TO_LOCAL(Uint32ToLocal, Object, Uint32)
MAKE_TO_LOCAL(ToLocal, BigInt, BigInt);
MAKE_TO_LOCAL(ExternalToLocal, JSObject, External)
MAKE_TO_LOCAL(CallableToLocal, JSReceiver, Function)
MAKE_TO_LOCAL(ToLocalPrimitive, Object, Primitive)
MAKE_TO_LOCAL(ToLocal, FixedArray, PrimitiveArray)
MAKE_TO_LOCAL(ScriptOrModuleToLocal, Script, ScriptOrModule)
#undef MAKE_TO_LOCAL_TYPED_ARRAY
#undef MAKE_TO_LOCAL
// Implementations of OpenHandle
#define MAKE_OPEN_HANDLE(From, To) \
v8::internal::Handle<v8::internal::To> Utils::OpenHandle( \
const v8::From* that, bool allow_empty_handle) { \
DCHECK(allow_empty_handle || that != nullptr); \
DCHECK(that == nullptr || \
(*reinterpret_cast<v8::internal::Object* const*>(that))->Is##To()); \
return v8::internal::Handle<v8::internal::To>( \
reinterpret_cast<v8::internal::To**>(const_cast<v8::From*>(that))); \
}
OPEN_HANDLE_LIST(MAKE_OPEN_HANDLE)
#undef MAKE_OPEN_HANDLE
#undef OPEN_HANDLE_LIST
namespace internal {
class V8_EXPORT_PRIVATE DeferredHandles {
public:
~DeferredHandles();
private:
DeferredHandles(Object** first_block_limit, Isolate* isolate)
: next_(nullptr),
previous_(nullptr),
first_block_limit_(first_block_limit),
isolate_(isolate) {
isolate->LinkDeferredHandles(this);
}
void Iterate(RootVisitor* v);
std::vector<Object**> blocks_;
DeferredHandles* next_;
DeferredHandles* previous_;
Object** first_block_limit_;
Isolate* isolate_;
friend class HandleScopeImplementer;
friend class Isolate;
};
// This class is here in order to be able to declare it a friend of
// HandleScope. Moving these methods to be members of HandleScope would be
// neat in some ways, but it would expose internal implementation details in
// our public header file, which is undesirable.
//
// An isolate has a single instance of this class to hold the current thread's
// data. In multithreaded V8 programs this data is copied in and out of storage
// so that the currently executing thread always has its own copy of this
// data.
class HandleScopeImplementer {
public:
explicit HandleScopeImplementer(Isolate* isolate)
: isolate_(isolate),
microtask_context_(nullptr),
spare_(nullptr),
call_depth_(0),
microtasks_depth_(0),
microtasks_suppressions_(0),
entered_contexts_count_(0),
entered_context_count_during_microtasks_(0),
#ifdef DEBUG
debug_microtasks_depth_(0),
#endif
microtasks_policy_(v8::MicrotasksPolicy::kAuto),
last_handle_before_deferred_block_(nullptr) {
}
~HandleScopeImplementer() {
DeleteArray(spare_);
}
// Threading support for handle data.
static int ArchiveSpacePerThread();
char* RestoreThread(char* from);
char* ArchiveThread(char* to);
void FreeThreadResources();
// Garbage collection support.
void Iterate(v8::internal::RootVisitor* v);
static char* Iterate(v8::internal::RootVisitor* v, char* data);
inline internal::Object** GetSpareOrNewBlock();
inline void DeleteExtensions(internal::Object** prev_limit);
// Call depth represents nested v8 api calls.
inline void IncrementCallDepth() {call_depth_++;}
inline void DecrementCallDepth() {call_depth_--;}
inline bool CallDepthIsZero() { return call_depth_ == 0; }
// Microtasks scope depth represents nested scopes controlling microtasks
// invocation, which happens when depth reaches zero.
inline void IncrementMicrotasksScopeDepth() {microtasks_depth_++;}
inline void DecrementMicrotasksScopeDepth() {microtasks_depth_--;}
inline int GetMicrotasksScopeDepth() { return microtasks_depth_; }
// Possibly nested microtasks suppression scopes prevent microtasks
// from running.
inline void IncrementMicrotasksSuppressions() {microtasks_suppressions_++;}
inline void DecrementMicrotasksSuppressions() {microtasks_suppressions_--;}
inline bool HasMicrotasksSuppressions() { return !!microtasks_suppressions_; }
#ifdef DEBUG
// In debug we check that calls not intended to invoke microtasks are
// still correctly wrapped with microtask scopes.
inline void IncrementDebugMicrotasksScopeDepth() {debug_microtasks_depth_++;}
inline void DecrementDebugMicrotasksScopeDepth() {debug_microtasks_depth_--;}
inline bool DebugMicrotasksScopeDepthIsZero() {
return debug_microtasks_depth_ == 0;
}
#endif
inline void set_microtasks_policy(v8::MicrotasksPolicy policy);
inline v8::MicrotasksPolicy microtasks_policy() const;
inline void EnterContext(Handle<Context> context);
inline void LeaveContext();
inline bool LastEnteredContextWas(Handle<Context> context);
// Returns the last entered context or an empty handle if no
// contexts have been entered.
inline Handle<Context> LastEnteredContext();
inline void EnterMicrotaskContext(Handle<Context> context);
inline void LeaveMicrotaskContext();
inline Handle<Context> MicrotaskContext();
inline bool MicrotaskContextIsLastEnteredContext() const {
return microtask_context_ &&
entered_context_count_during_microtasks_ == entered_contexts_.size();
}
inline void SaveContext(Context* context);
inline Context* RestoreContext();
inline bool HasSavedContexts();
inline DetachableVector<Object**>* blocks() { return &blocks_; }
Isolate* isolate() const { return isolate_; }
void ReturnBlock(Object** block) {
DCHECK_NOT_NULL(block);
if (spare_ != nullptr) DeleteArray(spare_);
spare_ = block;
}
private:
void ResetAfterArchive() {
blocks_.detach();
entered_contexts_.detach();
saved_contexts_.detach();
microtask_context_ = nullptr;
entered_context_count_during_microtasks_ = 0;
spare_ = nullptr;
last_handle_before_deferred_block_ = nullptr;
call_depth_ = 0;
}
void Free() {
DCHECK(blocks_.empty());
DCHECK(entered_contexts_.empty());
DCHECK(saved_contexts_.empty());
DCHECK(!microtask_context_);
blocks_.free();
entered_contexts_.free();
saved_contexts_.free();
if (spare_ != nullptr) {
DeleteArray(spare_);
spare_ = nullptr;
}
DCHECK_EQ(call_depth_, 0);
}
void BeginDeferredScope();
DeferredHandles* Detach(Object** prev_limit);
Isolate* isolate_;
DetachableVector<Object**> blocks_;
// Used as a stack to keep track of entered contexts.
DetachableVector<Context*> entered_contexts_;
// Used as a stack to keep track of saved contexts.
DetachableVector<Context*> saved_contexts_;
Context* microtask_context_;
Object** spare_;
int call_depth_;
int microtasks_depth_;
int microtasks_suppressions_;
size_t entered_contexts_count_;
size_t entered_context_count_during_microtasks_;
#ifdef DEBUG
int debug_microtasks_depth_;
#endif
v8::MicrotasksPolicy microtasks_policy_;
Object** last_handle_before_deferred_block_;
// This is only used for threading support.
HandleScopeData handle_scope_data_;
void IterateThis(RootVisitor* v);
char* RestoreThreadHelper(char* from);
char* ArchiveThreadHelper(char* to);
friend class DeferredHandles;
friend class DeferredHandleScope;
friend class HandleScopeImplementerOffsets;
DISALLOW_COPY_AND_ASSIGN(HandleScopeImplementer);
};
class HandleScopeImplementerOffsets {
public:
enum Offsets {
kMicrotaskContext = offsetof(HandleScopeImplementer, microtask_context_),
kEnteredContexts = offsetof(HandleScopeImplementer, entered_contexts_),
kEnteredContextsCount =
offsetof(HandleScopeImplementer, entered_contexts_count_),
kEnteredContextCountDuringMicrotasks = offsetof(
HandleScopeImplementer, entered_context_count_during_microtasks_)
};
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(HandleScopeImplementerOffsets);
};
const int kHandleBlockSize = v8::internal::KB - 2; // fit in one page
void HandleScopeImplementer::set_microtasks_policy(
v8::MicrotasksPolicy policy) {
microtasks_policy_ = policy;
}
v8::MicrotasksPolicy HandleScopeImplementer::microtasks_policy() const {
return microtasks_policy_;
}
void HandleScopeImplementer::SaveContext(Context* context) {
saved_contexts_.push_back(context);
}
Context* HandleScopeImplementer::RestoreContext() {
Context* last_context = saved_contexts_.back();
saved_contexts_.pop_back();
return last_context;
}
bool HandleScopeImplementer::HasSavedContexts() {
return !saved_contexts_.empty();
}
void HandleScopeImplementer::EnterContext(Handle<Context> context) {
entered_contexts_.push_back(*context);
entered_contexts_count_ = entered_contexts_.size();
}
void HandleScopeImplementer::LeaveContext() {
entered_contexts_.pop_back();
entered_contexts_count_ = entered_contexts_.size();
}
bool HandleScopeImplementer::LastEnteredContextWas(Handle<Context> context) {
return !entered_contexts_.empty() && entered_contexts_.back() == *context;
}
Handle<Context> HandleScopeImplementer::LastEnteredContext() {
if (entered_contexts_.empty()) return Handle<Context>::null();
return Handle<Context>(entered_contexts_.back(), isolate_);
}
void HandleScopeImplementer::EnterMicrotaskContext(Handle<Context> context) {
DCHECK(!microtask_context_);
microtask_context_ = *context;
entered_context_count_during_microtasks_ = entered_contexts_.size();
}
void HandleScopeImplementer::LeaveMicrotaskContext() {
microtask_context_ = nullptr;
entered_context_count_during_microtasks_ = 0;
}
Handle<Context> HandleScopeImplementer::MicrotaskContext() {
if (microtask_context_) return Handle<Context>(microtask_context_, isolate_);
return Handle<Context>::null();
}
// If there's a spare block, use it for growing the current scope.
internal::Object** HandleScopeImplementer::GetSpareOrNewBlock() {
internal::Object** block =
(spare_ != nullptr) ? spare_
: NewArray<internal::Object*>(kHandleBlockSize);
spare_ = nullptr;
return block;
}
void HandleScopeImplementer::DeleteExtensions(internal::Object** prev_limit) {
while (!blocks_.empty()) {
internal::Object** block_start = blocks_.back();
internal::Object** block_limit = block_start + kHandleBlockSize;
// SealHandleScope may make the prev_limit to point inside the block.
if (block_start <= prev_limit && prev_limit <= block_limit) {
#ifdef ENABLE_HANDLE_ZAPPING
internal::HandleScope::ZapRange(prev_limit, block_limit);
#endif
break;
}
blocks_.pop_back();
#ifdef ENABLE_HANDLE_ZAPPING
internal::HandleScope::ZapRange(block_start, block_limit);
#endif
if (spare_ != nullptr) {
DeleteArray(spare_);
}
spare_ = block_start;
}
DCHECK((blocks_.empty() && prev_limit == nullptr) ||
(!blocks_.empty() && prev_limit != nullptr));
}
// Interceptor functions called from generated inline caches to notify
// CPU profiler that external callbacks are invoked.
void InvokeAccessorGetterCallback(
v8::Local<v8::Name> property,
const v8::PropertyCallbackInfo<v8::Value>& info,
v8::AccessorNameGetterCallback getter);
void InvokeFunctionCallback(const v8::FunctionCallbackInfo<v8::Value>& info,
v8::FunctionCallback callback);
class Testing {
public:
static v8::Testing::StressType stress_type() { return stress_type_; }
static void set_stress_type(v8::Testing::StressType stress_type) {
stress_type_ = stress_type;
}
private:
static v8::Testing::StressType stress_type_;
};
} // namespace internal
} // namespace v8
#endif // V8_API_H_
|