1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
10 #include "include/v8-testing.h"
11 #include "src/contexts.h"
12 #include "src/factory.h"
13 #include "src/isolate.h"
14 #include "src/list-inl.h"
18 // Constants used in the implementation of the API. The most natural thing
19 // would usually be to place these with the classes that use them, but
20 // we want to keep them out of v8.h because it is an externally
25 FUNCTION_TEMPLATE = 0,
31 // Utilities for working with neander-objects, primitive
32 // env-independent JSObjects used by the api.
35 explicit NeanderObject(v8::internal::Isolate* isolate, int size);
36 explicit inline NeanderObject(v8::internal::Handle<v8::internal::Object> obj);
37 explicit inline NeanderObject(v8::internal::Object* obj);
38 inline v8::internal::Object* get(int index);
39 inline void set(int index, v8::internal::Object* value);
40 inline v8::internal::Handle<v8::internal::JSObject> value() { return value_; }
43 v8::internal::Handle<v8::internal::JSObject> value_;
47 // Utilities for working with neander-arrays, a simple extensible
48 // array abstraction built on neander-objects.
51 explicit NeanderArray(v8::internal::Isolate* isolate);
52 explicit inline NeanderArray(v8::internal::Handle<v8::internal::Object> obj);
53 inline v8::internal::Handle<v8::internal::JSObject> value() {
57 void add(internal::Isolate* isolate,
58 v8::internal::Handle<v8::internal::Object> value);
62 v8::internal::Object* get(int index);
63 // Change the value at an index to undefined value. If the index is
64 // out of bounds, the request is ignored. Returns the old value.
65 void set(int index, v8::internal::Object* value);
71 NeanderObject::NeanderObject(v8::internal::Handle<v8::internal::Object> obj)
72 : value_(v8::internal::Handle<v8::internal::JSObject>::cast(obj)) { }
75 NeanderObject::NeanderObject(v8::internal::Object* obj)
76 : value_(v8::internal::Handle<v8::internal::JSObject>(
77 v8::internal::JSObject::cast(obj))) { }
80 NeanderArray::NeanderArray(v8::internal::Handle<v8::internal::Object> obj)
84 v8::internal::Object* NeanderObject::get(int offset) {
85 DCHECK(value()->HasFastObjectElements());
86 return v8::internal::FixedArray::cast(value()->elements())->get(offset);
90 void NeanderObject::set(int offset, v8::internal::Object* value) {
91 DCHECK(value_->HasFastObjectElements());
92 v8::internal::FixedArray::cast(value_->elements())->set(offset, value);
96 template <typename T> inline T ToCData(v8::internal::Object* obj) {
97 STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
98 return reinterpret_cast<T>(
99 reinterpret_cast<intptr_t>(
100 v8::internal::Foreign::cast(obj)->foreign_address()));
104 template <typename T>
105 inline v8::internal::Handle<v8::internal::Object> FromCData(
106 v8::internal::Isolate* isolate, T obj) {
107 STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
108 return isolate->factory()->NewForeign(
109 reinterpret_cast<v8::internal::Address>(reinterpret_cast<intptr_t>(obj)));
115 explicit ApiFunction(v8::internal::Address addr) : addr_(addr) { }
116 v8::internal::Address address() { return addr_; }
118 v8::internal::Address addr_;
123 class RegisteredExtension {
125 explicit RegisteredExtension(Extension* extension);
126 static void Register(RegisteredExtension* that);
127 static void UnregisterAll();
128 Extension* extension() { return extension_; }
129 RegisteredExtension* next() { return next_; }
130 static RegisteredExtension* first_extension() { return first_extension_; }
132 Extension* extension_;
133 RegisteredExtension* next_;
134 static RegisteredExtension* first_extension_;
138 #define OPEN_HANDLE_LIST(V) \
139 V(Template, TemplateInfo) \
140 V(FunctionTemplate, FunctionTemplateInfo) \
141 V(ObjectTemplate, ObjectTemplateInfo) \
142 V(Signature, SignatureInfo) \
143 V(AccessorSignature, FunctionTemplateInfo) \
144 V(TypeSwitch, TypeSwitchInfo) \
146 V(RegExp, JSRegExp) \
147 V(Object, JSObject) \
149 V(ArrayBuffer, JSArrayBuffer) \
150 V(ArrayBufferView, JSArrayBufferView) \
151 V(TypedArray, JSTypedArray) \
152 V(Uint8Array, JSTypedArray) \
153 V(Uint8ClampedArray, JSTypedArray) \
154 V(Int8Array, JSTypedArray) \
155 V(Uint16Array, JSTypedArray) \
156 V(Int16Array, JSTypedArray) \
157 V(Uint32Array, JSTypedArray) \
158 V(Int32Array, JSTypedArray) \
159 V(Float32Array, JSTypedArray) \
160 V(Float64Array, JSTypedArray) \
161 V(DataView, JSDataView) \
165 V(Script, JSFunction) \
166 V(UnboundScript, SharedFunctionInfo) \
167 V(Function, JSFunction) \
168 V(Message, JSMessageObject) \
169 V(Context, Context) \
170 V(External, Object) \
171 V(StackTrace, JSArray) \
172 V(StackFrame, JSObject)
176 static inline bool ApiCheck(bool condition,
177 const char* location,
178 const char* message) {
179 if (!condition) Utils::ReportApiFailure(location, message);
183 static Local<FunctionTemplate> ToFunctionTemplate(NeanderObject obj);
184 static Local<ObjectTemplate> ToObjectTemplate(NeanderObject obj);
186 static inline Local<Context> ToLocal(
187 v8::internal::Handle<v8::internal::Context> obj);
188 static inline Local<Value> ToLocal(
189 v8::internal::Handle<v8::internal::Object> obj);
190 static inline Local<Function> ToLocal(
191 v8::internal::Handle<v8::internal::JSFunction> obj);
192 static inline Local<Name> ToLocal(
193 v8::internal::Handle<v8::internal::Name> obj);
194 static inline Local<String> ToLocal(
195 v8::internal::Handle<v8::internal::String> obj);
196 static inline Local<Symbol> ToLocal(
197 v8::internal::Handle<v8::internal::Symbol> obj);
198 static inline Local<RegExp> ToLocal(
199 v8::internal::Handle<v8::internal::JSRegExp> obj);
200 static inline Local<Object> ToLocal(
201 v8::internal::Handle<v8::internal::JSObject> obj);
202 static inline Local<Array> ToLocal(
203 v8::internal::Handle<v8::internal::JSArray> obj);
204 static inline Local<ArrayBuffer> ToLocal(
205 v8::internal::Handle<v8::internal::JSArrayBuffer> obj);
206 static inline Local<ArrayBufferView> ToLocal(
207 v8::internal::Handle<v8::internal::JSArrayBufferView> obj);
208 static inline Local<DataView> ToLocal(
209 v8::internal::Handle<v8::internal::JSDataView> obj);
211 static inline Local<TypedArray> ToLocal(
212 v8::internal::Handle<v8::internal::JSTypedArray> obj);
213 static inline Local<Uint8Array> ToLocalUint8Array(
214 v8::internal::Handle<v8::internal::JSTypedArray> obj);
215 static inline Local<Uint8ClampedArray> ToLocalUint8ClampedArray(
216 v8::internal::Handle<v8::internal::JSTypedArray> obj);
217 static inline Local<Int8Array> ToLocalInt8Array(
218 v8::internal::Handle<v8::internal::JSTypedArray> obj);
219 static inline Local<Uint16Array> ToLocalUint16Array(
220 v8::internal::Handle<v8::internal::JSTypedArray> obj);
221 static inline Local<Int16Array> ToLocalInt16Array(
222 v8::internal::Handle<v8::internal::JSTypedArray> obj);
223 static inline Local<Uint32Array> ToLocalUint32Array(
224 v8::internal::Handle<v8::internal::JSTypedArray> obj);
225 static inline Local<Int32Array> ToLocalInt32Array(
226 v8::internal::Handle<v8::internal::JSTypedArray> obj);
227 static inline Local<Float32Array> ToLocalFloat32Array(
228 v8::internal::Handle<v8::internal::JSTypedArray> obj);
229 static inline Local<Float64Array> ToLocalFloat64Array(
230 v8::internal::Handle<v8::internal::JSTypedArray> obj);
232 static inline Local<Message> MessageToLocal(
233 v8::internal::Handle<v8::internal::Object> obj);
234 static inline Local<Promise> PromiseToLocal(
235 v8::internal::Handle<v8::internal::JSObject> obj);
236 static inline Local<StackTrace> StackTraceToLocal(
237 v8::internal::Handle<v8::internal::JSArray> obj);
238 static inline Local<StackFrame> StackFrameToLocal(
239 v8::internal::Handle<v8::internal::JSObject> obj);
240 static inline Local<Number> NumberToLocal(
241 v8::internal::Handle<v8::internal::Object> obj);
242 static inline Local<Integer> IntegerToLocal(
243 v8::internal::Handle<v8::internal::Object> obj);
244 static inline Local<Uint32> Uint32ToLocal(
245 v8::internal::Handle<v8::internal::Object> obj);
246 static inline Local<FunctionTemplate> ToLocal(
247 v8::internal::Handle<v8::internal::FunctionTemplateInfo> obj);
248 static inline Local<ObjectTemplate> ToLocal(
249 v8::internal::Handle<v8::internal::ObjectTemplateInfo> obj);
250 static inline Local<Signature> ToLocal(
251 v8::internal::Handle<v8::internal::SignatureInfo> obj);
252 static inline Local<AccessorSignature> AccessorSignatureToLocal(
253 v8::internal::Handle<v8::internal::FunctionTemplateInfo> obj);
254 static inline Local<TypeSwitch> ToLocal(
255 v8::internal::Handle<v8::internal::TypeSwitchInfo> obj);
256 static inline Local<External> ExternalToLocal(
257 v8::internal::Handle<v8::internal::JSObject> obj);
259 #define DECLARE_OPEN_HANDLE(From, To) \
260 static inline v8::internal::Handle<v8::internal::To> \
261 OpenHandle(const From* that, bool allow_empty_handle = false);
263 OPEN_HANDLE_LIST(DECLARE_OPEN_HANDLE)
265 #undef DECLARE_OPEN_HANDLE
267 template<class From, class To>
268 static inline Local<To> Convert(v8::internal::Handle<From> obj) {
269 DCHECK(obj.is_null() || !obj->IsTheHole());
270 return Local<To>(reinterpret_cast<To*>(obj.location()));
274 static inline v8::internal::Handle<v8::internal::Object> OpenPersistent(
275 const v8::Persistent<T>& persistent) {
276 return v8::internal::Handle<v8::internal::Object>(
277 reinterpret_cast<v8::internal::Object**>(persistent.val_));
281 static inline v8::internal::Handle<v8::internal::Object> OpenPersistent(
282 v8::Persistent<T>* persistent) {
283 return OpenPersistent(*persistent);
286 template <class From, class To>
287 static inline v8::internal::Handle<To> OpenHandle(v8::Local<From> handle) {
288 return OpenHandle(*handle);
292 static void ReportApiFailure(const char* location, const char* message);
297 v8::internal::Handle<T> v8::internal::Handle<T>::EscapeFrom(
298 v8::EscapableHandleScope* scope) {
299 v8::internal::Handle<T> handle;
303 return Utils::OpenHandle(*scope->Escape(Utils::ToLocal(handle)), true);
308 inline T* ToApi(v8::internal::Handle<v8::internal::Object> obj) {
309 return reinterpret_cast<T*>(obj.location());
313 inline v8::Local<T> ToApiHandle(
314 v8::internal::Handle<v8::internal::Object> obj) {
315 return Utils::Convert<v8::internal::Object, T>(obj);
319 // Implementations of ToLocal
321 #define MAKE_TO_LOCAL(Name, From, To) \
322 Local<v8::To> Utils::Name(v8::internal::Handle<v8::internal::From> obj) { \
323 return Convert<v8::internal::From, v8::To>(obj); \
327 #define MAKE_TO_LOCAL_TYPED_ARRAY(Type, typeName, TYPE, ctype, size) \
328 Local<v8::Type##Array> Utils::ToLocal##Type##Array( \
329 v8::internal::Handle<v8::internal::JSTypedArray> obj) { \
330 DCHECK(obj->type() == kExternal##Type##Array); \
331 return Convert<v8::internal::JSTypedArray, v8::Type##Array>(obj); \
335 MAKE_TO_LOCAL(ToLocal, Context, Context)
336 MAKE_TO_LOCAL(ToLocal, Object, Value)
337 MAKE_TO_LOCAL(ToLocal, JSFunction, Function)
338 MAKE_TO_LOCAL(ToLocal, Name, Name)
339 MAKE_TO_LOCAL(ToLocal, String, String)
340 MAKE_TO_LOCAL(ToLocal, Symbol, Symbol)
341 MAKE_TO_LOCAL(ToLocal, JSRegExp, RegExp)
342 MAKE_TO_LOCAL(ToLocal, JSObject, Object)
343 MAKE_TO_LOCAL(ToLocal, JSArray, Array)
344 MAKE_TO_LOCAL(ToLocal, JSArrayBuffer, ArrayBuffer)
345 MAKE_TO_LOCAL(ToLocal, JSArrayBufferView, ArrayBufferView)
346 MAKE_TO_LOCAL(ToLocal, JSDataView, DataView)
347 MAKE_TO_LOCAL(ToLocal, JSTypedArray, TypedArray)
349 TYPED_ARRAYS(MAKE_TO_LOCAL_TYPED_ARRAY)
351 MAKE_TO_LOCAL(ToLocal, FunctionTemplateInfo, FunctionTemplate)
352 MAKE_TO_LOCAL(ToLocal, ObjectTemplateInfo, ObjectTemplate)
353 MAKE_TO_LOCAL(ToLocal, SignatureInfo, Signature)
354 MAKE_TO_LOCAL(AccessorSignatureToLocal, FunctionTemplateInfo, AccessorSignature)
355 MAKE_TO_LOCAL(ToLocal, TypeSwitchInfo, TypeSwitch)
356 MAKE_TO_LOCAL(MessageToLocal, Object, Message)
357 MAKE_TO_LOCAL(PromiseToLocal, JSObject, Promise)
358 MAKE_TO_LOCAL(StackTraceToLocal, JSArray, StackTrace)
359 MAKE_TO_LOCAL(StackFrameToLocal, JSObject, StackFrame)
360 MAKE_TO_LOCAL(NumberToLocal, Object, Number)
361 MAKE_TO_LOCAL(IntegerToLocal, Object, Integer)
362 MAKE_TO_LOCAL(Uint32ToLocal, Object, Uint32)
363 MAKE_TO_LOCAL(ExternalToLocal, JSObject, External)
365 #undef MAKE_TO_LOCAL_TYPED_ARRAY
369 // Implementations of OpenHandle
371 #define MAKE_OPEN_HANDLE(From, To) \
372 v8::internal::Handle<v8::internal::To> Utils::OpenHandle( \
373 const v8::From* that, bool allow_empty_handle) { \
374 DCHECK(allow_empty_handle || that != NULL); \
375 DCHECK(that == NULL || \
376 (*reinterpret_cast<v8::internal::Object* const*>(that))->Is##To()); \
377 return v8::internal::Handle<v8::internal::To>( \
378 reinterpret_cast<v8::internal::To**>(const_cast<v8::From*>(that))); \
381 OPEN_HANDLE_LIST(MAKE_OPEN_HANDLE)
383 #undef MAKE_OPEN_HANDLE
384 #undef OPEN_HANDLE_LIST
389 // Tracks string usage to help make better decisions when
390 // externalizing strings.
392 // Implementation note: internally this class only tracks fresh
393 // strings and keeps a single use counter for them.
394 class StringTracker {
396 // Records that the given string's characters were copied to some
397 // external buffer. If this happens often we should honor
398 // externalization requests for the string.
399 void RecordWrite(Handle<String> string) {
400 Address address = reinterpret_cast<Address>(*string);
401 Address top = isolate_->heap()->NewSpaceTop();
402 if (IsFreshString(address, top)) {
403 IncrementUseCount(top);
407 // Estimates freshness and use frequency of the given string based
408 // on how close it is to the new space top and the recorded usage
410 inline bool IsFreshUnusedString(Handle<String> string) {
411 Address address = reinterpret_cast<Address>(*string);
412 Address top = isolate_->heap()->NewSpaceTop();
413 return IsFreshString(address, top) && IsUseCountLow(top);
417 StringTracker() : use_count_(0), last_top_(NULL), isolate_(NULL) { }
419 static inline bool IsFreshString(Address string, Address top) {
420 return top - kFreshnessLimit <= string && string <= top;
423 inline bool IsUseCountLow(Address top) {
424 if (last_top_ != top) return true;
425 return use_count_ < kUseLimit;
428 inline void IncrementUseCount(Address top) {
429 if (last_top_ != top) {
436 // Single use counter shared by all fresh strings.
439 // Last new space top when the use count above was valid.
444 // How close to the new space top a fresh string has to be.
445 static const int kFreshnessLimit = 1024;
447 // The number of uses required to consider a string useful.
448 static const int kUseLimit = 32;
450 friend class Isolate;
452 DISALLOW_COPY_AND_ASSIGN(StringTracker);
456 class DeferredHandles {
461 DeferredHandles(Object** first_block_limit, Isolate* isolate)
464 first_block_limit_(first_block_limit),
466 isolate->LinkDeferredHandles(this);
469 void Iterate(ObjectVisitor* v);
471 List<Object**> blocks_;
472 DeferredHandles* next_;
473 DeferredHandles* previous_;
474 Object** first_block_limit_;
477 friend class HandleScopeImplementer;
478 friend class Isolate;
482 // This class is here in order to be able to declare it a friend of
483 // HandleScope. Moving these methods to be members of HandleScope would be
484 // neat in some ways, but it would expose internal implementation details in
485 // our public header file, which is undesirable.
487 // An isolate has a single instance of this class to hold the current thread's
488 // data. In multithreaded V8 programs this data is copied in and out of storage
489 // so that the currently executing thread always has its own copy of this
491 class HandleScopeImplementer {
493 explicit HandleScopeImplementer(Isolate* isolate)
496 entered_contexts_(0),
500 last_handle_before_deferred_block_(NULL) { }
502 ~HandleScopeImplementer() {
506 // Threading support for handle data.
507 static int ArchiveSpacePerThread();
508 char* RestoreThread(char* from);
509 char* ArchiveThread(char* to);
510 void FreeThreadResources();
512 // Garbage collection support.
513 void Iterate(v8::internal::ObjectVisitor* v);
514 static char* Iterate(v8::internal::ObjectVisitor* v, char* data);
517 inline internal::Object** GetSpareOrNewBlock();
518 inline void DeleteExtensions(internal::Object** prev_limit);
520 inline void IncrementCallDepth() {call_depth_++;}
521 inline void DecrementCallDepth() {call_depth_--;}
522 inline bool CallDepthIsZero() { return call_depth_ == 0; }
524 inline void EnterContext(Handle<Context> context);
525 inline void LeaveContext();
526 inline bool LastEnteredContextWas(Handle<Context> context);
528 // Returns the last entered context or an empty handle if no
529 // contexts have been entered.
530 inline Handle<Context> LastEnteredContext();
532 inline void SaveContext(Context* context);
533 inline Context* RestoreContext();
534 inline bool HasSavedContexts();
536 inline List<internal::Object**>* blocks() { return &blocks_; }
537 Isolate* isolate() const { return isolate_; }
539 void ReturnBlock(Object** block) {
540 DCHECK(block != NULL);
541 if (spare_ != NULL) DeleteArray(spare_);
546 void ResetAfterArchive() {
547 blocks_.Initialize(0);
548 entered_contexts_.Initialize(0);
549 saved_contexts_.Initialize(0);
551 last_handle_before_deferred_block_ = NULL;
556 DCHECK(blocks_.length() == 0);
557 DCHECK(entered_contexts_.length() == 0);
558 DCHECK(saved_contexts_.length() == 0);
560 entered_contexts_.Free();
561 saved_contexts_.Free();
562 if (spare_ != NULL) {
566 DCHECK(call_depth_ == 0);
569 void BeginDeferredScope();
570 DeferredHandles* Detach(Object** prev_limit);
573 List<internal::Object**> blocks_;
574 // Used as a stack to keep track of entered contexts.
575 List<Context*> entered_contexts_;
576 // Used as a stack to keep track of saved contexts.
577 List<Context*> saved_contexts_;
580 Object** last_handle_before_deferred_block_;
581 // This is only used for threading support.
582 HandleScopeData handle_scope_data_;
584 void IterateThis(ObjectVisitor* v);
585 char* RestoreThreadHelper(char* from);
586 char* ArchiveThreadHelper(char* to);
588 friend class DeferredHandles;
589 friend class DeferredHandleScope;
591 DISALLOW_COPY_AND_ASSIGN(HandleScopeImplementer);
595 const int kHandleBlockSize = v8::internal::KB - 2; // fit in one page
598 void HandleScopeImplementer::SaveContext(Context* context) {
599 saved_contexts_.Add(context);
603 Context* HandleScopeImplementer::RestoreContext() {
604 return saved_contexts_.RemoveLast();
608 bool HandleScopeImplementer::HasSavedContexts() {
609 return !saved_contexts_.is_empty();
613 void HandleScopeImplementer::EnterContext(Handle<Context> context) {
614 entered_contexts_.Add(*context);
618 void HandleScopeImplementer::LeaveContext() {
619 entered_contexts_.RemoveLast();
623 bool HandleScopeImplementer::LastEnteredContextWas(Handle<Context> context) {
624 return !entered_contexts_.is_empty() && entered_contexts_.last() == *context;
628 Handle<Context> HandleScopeImplementer::LastEnteredContext() {
629 if (entered_contexts_.is_empty()) return Handle<Context>::null();
630 return Handle<Context>(entered_contexts_.last());
634 // If there's a spare block, use it for growing the current scope.
635 internal::Object** HandleScopeImplementer::GetSpareOrNewBlock() {
636 internal::Object** block = (spare_ != NULL) ?
638 NewArray<internal::Object*>(kHandleBlockSize);
644 void HandleScopeImplementer::DeleteExtensions(internal::Object** prev_limit) {
645 while (!blocks_.is_empty()) {
646 internal::Object** block_start = blocks_.last();
647 internal::Object** block_limit = block_start + kHandleBlockSize;
649 // SealHandleScope may make the prev_limit to point inside the block.
650 if (block_start <= prev_limit && prev_limit <= block_limit) {
651 #ifdef ENABLE_HANDLE_ZAPPING
652 internal::HandleScope::ZapRange(prev_limit, block_limit);
657 if (prev_limit == block_limit) break;
660 blocks_.RemoveLast();
661 #ifdef ENABLE_HANDLE_ZAPPING
662 internal::HandleScope::ZapRange(block_start, block_limit);
664 if (spare_ != NULL) {
667 spare_ = block_start;
669 DCHECK((blocks_.is_empty() && prev_limit == NULL) ||
670 (!blocks_.is_empty() && prev_limit != NULL));
674 // Interceptor functions called from generated inline caches to notify
675 // CPU profiler that external callbacks are invoked.
676 void InvokeAccessorGetterCallback(
677 v8::Local<v8::Name> property,
678 const v8::PropertyCallbackInfo<v8::Value>& info,
679 v8::AccessorNameGetterCallback getter);
681 void InvokeFunctionCallback(const v8::FunctionCallbackInfo<v8::Value>& info,
682 v8::FunctionCallback callback);
686 static v8::Testing::StressType stress_type() { return stress_type_; }
687 static void set_stress_type(v8::Testing::StressType stress_type) {
688 stress_type_ = stress_type;
692 static v8::Testing::StressType stress_type_;
695 } } // namespace v8::internal