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(v8::internal::Handle<v8::internal::Object> value);
61 v8::internal::Object* get(int index);
62 // Change the value at an index to undefined value. If the index is
63 // out of bounds, the request is ignored. Returns the old value.
64 void set(int index, v8::internal::Object* value);
70 NeanderObject::NeanderObject(v8::internal::Handle<v8::internal::Object> obj)
71 : value_(v8::internal::Handle<v8::internal::JSObject>::cast(obj)) { }
74 NeanderObject::NeanderObject(v8::internal::Object* obj)
75 : value_(v8::internal::Handle<v8::internal::JSObject>(
76 v8::internal::JSObject::cast(obj))) { }
79 NeanderArray::NeanderArray(v8::internal::Handle<v8::internal::Object> obj)
83 v8::internal::Object* NeanderObject::get(int offset) {
84 DCHECK(value()->HasFastObjectElements());
85 return v8::internal::FixedArray::cast(value()->elements())->get(offset);
89 void NeanderObject::set(int offset, v8::internal::Object* value) {
90 DCHECK(value_->HasFastObjectElements());
91 v8::internal::FixedArray::cast(value_->elements())->set(offset, value);
95 template <typename T> inline T ToCData(v8::internal::Object* obj) {
96 STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
97 return reinterpret_cast<T>(
98 reinterpret_cast<intptr_t>(
99 v8::internal::Foreign::cast(obj)->foreign_address()));
103 template <typename T>
104 inline v8::internal::Handle<v8::internal::Object> FromCData(
105 v8::internal::Isolate* isolate, T obj) {
106 STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
107 return isolate->factory()->NewForeign(
108 reinterpret_cast<v8::internal::Address>(reinterpret_cast<intptr_t>(obj)));
114 explicit ApiFunction(v8::internal::Address addr) : addr_(addr) { }
115 v8::internal::Address address() { return addr_; }
117 v8::internal::Address addr_;
122 class RegisteredExtension {
124 explicit RegisteredExtension(Extension* extension);
125 static void Register(RegisteredExtension* that);
126 static void UnregisterAll();
127 Extension* extension() { return extension_; }
128 RegisteredExtension* next() { return next_; }
129 static RegisteredExtension* first_extension() { return first_extension_; }
131 Extension* extension_;
132 RegisteredExtension* next_;
133 static RegisteredExtension* first_extension_;
137 #define OPEN_HANDLE_LIST(V) \
138 V(Template, TemplateInfo) \
139 V(FunctionTemplate, FunctionTemplateInfo) \
140 V(ObjectTemplate, ObjectTemplateInfo) \
141 V(Signature, SignatureInfo) \
142 V(AccessorSignature, FunctionTemplateInfo) \
143 V(TypeSwitch, TypeSwitchInfo) \
145 V(RegExp, JSRegExp) \
146 V(Object, JSObject) \
148 V(ArrayBuffer, JSArrayBuffer) \
149 V(ArrayBufferView, JSArrayBufferView) \
150 V(TypedArray, JSTypedArray) \
151 V(Uint8Array, JSTypedArray) \
152 V(Uint8ClampedArray, JSTypedArray) \
153 V(Int8Array, JSTypedArray) \
154 V(Uint16Array, JSTypedArray) \
155 V(Int16Array, JSTypedArray) \
156 V(Uint32Array, JSTypedArray) \
157 V(Int32Array, JSTypedArray) \
158 V(Float32Array, JSTypedArray) \
159 V(Float32x4Array, JSTypedArray) \
160 V(Float64x2Array, JSTypedArray) \
161 V(Int32x4Array, JSTypedArray) \
162 V(Float64Array, JSTypedArray) \
163 V(DataView, JSDataView) \
166 V(Script, JSFunction) \
167 V(UnboundScript, SharedFunctionInfo) \
168 V(Function, JSFunction) \
169 V(Message, JSMessageObject) \
170 V(Context, Context) \
171 V(External, Object) \
172 V(StackTrace, JSArray) \
173 V(StackFrame, JSObject) \
174 V(DeclaredAccessorDescriptor, DeclaredAccessorDescriptor)
179 static inline bool ApiCheck(bool condition,
180 const char* location,
181 const char* message) {
182 if (!condition) Utils::ReportApiFailure(location, message);
186 static Local<FunctionTemplate> ToFunctionTemplate(NeanderObject obj);
187 static Local<ObjectTemplate> ToObjectTemplate(NeanderObject obj);
189 static inline Local<Context> ToLocal(
190 v8::internal::Handle<v8::internal::Context> obj);
191 static inline Local<Value> ToLocal(
192 v8::internal::Handle<v8::internal::Object> obj);
193 static inline Local<Function> ToLocal(
194 v8::internal::Handle<v8::internal::JSFunction> obj);
195 static inline Local<String> ToLocal(
196 v8::internal::Handle<v8::internal::String> obj);
197 static inline Local<Symbol> ToLocal(
198 v8::internal::Handle<v8::internal::Symbol> obj);
199 static inline Local<RegExp> ToLocal(
200 v8::internal::Handle<v8::internal::JSRegExp> obj);
201 static inline Local<Object> ToLocal(
202 v8::internal::Handle<v8::internal::JSObject> obj);
203 static inline Local<Array> ToLocal(
204 v8::internal::Handle<v8::internal::JSArray> obj);
205 static inline Local<ArrayBuffer> ToLocal(
206 v8::internal::Handle<v8::internal::JSArrayBuffer> obj);
207 static inline Local<ArrayBufferView> ToLocal(
208 v8::internal::Handle<v8::internal::JSArrayBufferView> obj);
209 static inline Local<DataView> ToLocal(
210 v8::internal::Handle<v8::internal::JSDataView> obj);
212 static inline Local<TypedArray> ToLocal(
213 v8::internal::Handle<v8::internal::JSTypedArray> obj);
214 static inline Local<Uint8Array> ToLocalUint8Array(
215 v8::internal::Handle<v8::internal::JSTypedArray> obj);
216 static inline Local<Uint8ClampedArray> ToLocalUint8ClampedArray(
217 v8::internal::Handle<v8::internal::JSTypedArray> obj);
218 static inline Local<Int8Array> ToLocalInt8Array(
219 v8::internal::Handle<v8::internal::JSTypedArray> obj);
220 static inline Local<Uint16Array> ToLocalUint16Array(
221 v8::internal::Handle<v8::internal::JSTypedArray> obj);
222 static inline Local<Int16Array> ToLocalInt16Array(
223 v8::internal::Handle<v8::internal::JSTypedArray> obj);
224 static inline Local<Uint32Array> ToLocalUint32Array(
225 v8::internal::Handle<v8::internal::JSTypedArray> obj);
226 static inline Local<Int32Array> ToLocalInt32Array(
227 v8::internal::Handle<v8::internal::JSTypedArray> obj);
228 static inline Local<Float32Array> ToLocalFloat32Array(
229 v8::internal::Handle<v8::internal::JSTypedArray> obj);
230 static inline Local<Float32x4Array> ToLocalFloat32x4Array(
231 v8::internal::Handle<v8::internal::JSTypedArray> obj);
232 static inline Local<Float64x2Array> ToLocalFloat64x2Array(
233 v8::internal::Handle<v8::internal::JSTypedArray> obj);
234 static inline Local<Int32x4Array> ToLocalInt32x4Array(
235 v8::internal::Handle<v8::internal::JSTypedArray> obj);
236 static inline Local<Float64Array> ToLocalFloat64Array(
237 v8::internal::Handle<v8::internal::JSTypedArray> obj);
239 static inline Local<Message> MessageToLocal(
240 v8::internal::Handle<v8::internal::Object> obj);
241 static inline Local<StackTrace> StackTraceToLocal(
242 v8::internal::Handle<v8::internal::JSArray> obj);
243 static inline Local<StackFrame> StackFrameToLocal(
244 v8::internal::Handle<v8::internal::JSObject> obj);
245 static inline Local<Number> NumberToLocal(
246 v8::internal::Handle<v8::internal::Object> obj);
247 static inline Local<Integer> IntegerToLocal(
248 v8::internal::Handle<v8::internal::Object> obj);
249 static inline Local<Uint32> Uint32ToLocal(
250 v8::internal::Handle<v8::internal::Object> obj);
251 static inline Local<FunctionTemplate> ToLocal(
252 v8::internal::Handle<v8::internal::FunctionTemplateInfo> obj);
253 static inline Local<ObjectTemplate> ToLocal(
254 v8::internal::Handle<v8::internal::ObjectTemplateInfo> obj);
255 static inline Local<Signature> ToLocal(
256 v8::internal::Handle<v8::internal::SignatureInfo> obj);
257 static inline Local<AccessorSignature> AccessorSignatureToLocal(
258 v8::internal::Handle<v8::internal::FunctionTemplateInfo> obj);
259 static inline Local<TypeSwitch> ToLocal(
260 v8::internal::Handle<v8::internal::TypeSwitchInfo> obj);
261 static inline Local<External> ExternalToLocal(
262 v8::internal::Handle<v8::internal::JSObject> obj);
263 static inline Local<DeclaredAccessorDescriptor> ToLocal(
264 v8::internal::Handle<v8::internal::DeclaredAccessorDescriptor> obj);
266 #define DECLARE_OPEN_HANDLE(From, To) \
267 static inline v8::internal::Handle<v8::internal::To> \
268 OpenHandle(const From* that, bool allow_empty_handle = false);
270 OPEN_HANDLE_LIST(DECLARE_OPEN_HANDLE)
272 #undef DECLARE_OPEN_HANDLE
274 template<class From, class To>
275 static inline Local<To> Convert(v8::internal::Handle<From> obj) {
276 DCHECK(obj.is_null() || !obj->IsTheHole());
277 return Local<To>(reinterpret_cast<To*>(obj.location()));
281 static inline v8::internal::Handle<v8::internal::Object> OpenPersistent(
282 const v8::Persistent<T>& persistent) {
283 return v8::internal::Handle<v8::internal::Object>(
284 reinterpret_cast<v8::internal::Object**>(persistent.val_));
288 static inline v8::internal::Handle<v8::internal::Object> OpenPersistent(
289 v8::Persistent<T>* persistent) {
290 return OpenPersistent(*persistent);
293 template <class From, class To>
294 static inline v8::internal::Handle<To> OpenHandle(v8::Local<From> handle) {
295 return OpenHandle(*handle);
299 static void ReportApiFailure(const char* location, const char* message);
304 v8::internal::Handle<T> v8::internal::Handle<T>::EscapeFrom(
305 v8::EscapableHandleScope* scope) {
306 v8::internal::Handle<T> handle;
310 return Utils::OpenHandle(*scope->Escape(Utils::ToLocal(handle)), true);
315 inline T* ToApi(v8::internal::Handle<v8::internal::Object> obj) {
316 return reinterpret_cast<T*>(obj.location());
320 inline v8::Local<T> ToApiHandle(
321 v8::internal::Handle<v8::internal::Object> obj) {
322 return Utils::Convert<v8::internal::Object, T>(obj);
326 // Implementations of ToLocal
328 #define MAKE_TO_LOCAL(Name, From, To) \
329 Local<v8::To> Utils::Name(v8::internal::Handle<v8::internal::From> obj) { \
330 return Convert<v8::internal::From, v8::To>(obj); \
334 #define MAKE_TO_LOCAL_TYPED_ARRAY(Type, typeName, TYPE, ctype, size) \
335 Local<v8::Type##Array> Utils::ToLocal##Type##Array( \
336 v8::internal::Handle<v8::internal::JSTypedArray> obj) { \
337 DCHECK(obj->type() == kExternal##Type##Array); \
338 return Convert<v8::internal::JSTypedArray, v8::Type##Array>(obj); \
342 MAKE_TO_LOCAL(ToLocal, Context, Context)
343 MAKE_TO_LOCAL(ToLocal, Object, Value)
344 MAKE_TO_LOCAL(ToLocal, JSFunction, Function)
345 MAKE_TO_LOCAL(ToLocal, String, String)
346 MAKE_TO_LOCAL(ToLocal, Symbol, Symbol)
347 MAKE_TO_LOCAL(ToLocal, JSRegExp, RegExp)
348 MAKE_TO_LOCAL(ToLocal, JSObject, Object)
349 MAKE_TO_LOCAL(ToLocal, JSArray, Array)
350 MAKE_TO_LOCAL(ToLocal, JSArrayBuffer, ArrayBuffer)
351 MAKE_TO_LOCAL(ToLocal, JSArrayBufferView, ArrayBufferView)
352 MAKE_TO_LOCAL(ToLocal, JSDataView, DataView)
353 MAKE_TO_LOCAL(ToLocal, JSTypedArray, TypedArray)
355 TYPED_ARRAYS(MAKE_TO_LOCAL_TYPED_ARRAY)
357 MAKE_TO_LOCAL(ToLocal, FunctionTemplateInfo, FunctionTemplate)
358 MAKE_TO_LOCAL(ToLocal, ObjectTemplateInfo, ObjectTemplate)
359 MAKE_TO_LOCAL(ToLocal, SignatureInfo, Signature)
360 MAKE_TO_LOCAL(AccessorSignatureToLocal, FunctionTemplateInfo, AccessorSignature)
361 MAKE_TO_LOCAL(ToLocal, TypeSwitchInfo, TypeSwitch)
362 MAKE_TO_LOCAL(MessageToLocal, Object, Message)
363 MAKE_TO_LOCAL(StackTraceToLocal, JSArray, StackTrace)
364 MAKE_TO_LOCAL(StackFrameToLocal, JSObject, StackFrame)
365 MAKE_TO_LOCAL(NumberToLocal, Object, Number)
366 MAKE_TO_LOCAL(IntegerToLocal, Object, Integer)
367 MAKE_TO_LOCAL(Uint32ToLocal, Object, Uint32)
368 MAKE_TO_LOCAL(ExternalToLocal, JSObject, External)
369 MAKE_TO_LOCAL(ToLocal, DeclaredAccessorDescriptor, DeclaredAccessorDescriptor)
371 #undef MAKE_TO_LOCAL_TYPED_ARRAY
375 // Implementations of OpenHandle
377 #define MAKE_OPEN_HANDLE(From, To) \
378 v8::internal::Handle<v8::internal::To> Utils::OpenHandle( \
379 const v8::From* that, bool allow_empty_handle) { \
380 EXTRA_CHECK(allow_empty_handle || that != NULL); \
381 EXTRA_CHECK(that == NULL || \
382 (*reinterpret_cast<v8::internal::Object* const*>(that))->Is##To()); \
383 return v8::internal::Handle<v8::internal::To>( \
384 reinterpret_cast<v8::internal::To**>(const_cast<v8::From*>(that))); \
387 OPEN_HANDLE_LIST(MAKE_OPEN_HANDLE)
389 #undef MAKE_OPEN_HANDLE
390 #undef OPEN_HANDLE_LIST
395 // Tracks string usage to help make better decisions when
396 // externalizing strings.
398 // Implementation note: internally this class only tracks fresh
399 // strings and keeps a single use counter for them.
400 class StringTracker {
402 // Records that the given string's characters were copied to some
403 // external buffer. If this happens often we should honor
404 // externalization requests for the string.
405 void RecordWrite(Handle<String> string) {
406 Address address = reinterpret_cast<Address>(*string);
407 Address top = isolate_->heap()->NewSpaceTop();
408 if (IsFreshString(address, top)) {
409 IncrementUseCount(top);
413 // Estimates freshness and use frequency of the given string based
414 // on how close it is to the new space top and the recorded usage
416 inline bool IsFreshUnusedString(Handle<String> string) {
417 Address address = reinterpret_cast<Address>(*string);
418 Address top = isolate_->heap()->NewSpaceTop();
419 return IsFreshString(address, top) && IsUseCountLow(top);
423 StringTracker() : use_count_(0), last_top_(NULL), isolate_(NULL) { }
425 static inline bool IsFreshString(Address string, Address top) {
426 return top - kFreshnessLimit <= string && string <= top;
429 inline bool IsUseCountLow(Address top) {
430 if (last_top_ != top) return true;
431 return use_count_ < kUseLimit;
434 inline void IncrementUseCount(Address top) {
435 if (last_top_ != top) {
442 // Single use counter shared by all fresh strings.
445 // Last new space top when the use count above was valid.
450 // How close to the new space top a fresh string has to be.
451 static const int kFreshnessLimit = 1024;
453 // The number of uses required to consider a string useful.
454 static const int kUseLimit = 32;
456 friend class Isolate;
458 DISALLOW_COPY_AND_ASSIGN(StringTracker);
462 class DeferredHandles {
467 DeferredHandles(Object** first_block_limit, Isolate* isolate)
470 first_block_limit_(first_block_limit),
472 isolate->LinkDeferredHandles(this);
475 void Iterate(ObjectVisitor* v);
477 List<Object**> blocks_;
478 DeferredHandles* next_;
479 DeferredHandles* previous_;
480 Object** first_block_limit_;
483 friend class HandleScopeImplementer;
484 friend class Isolate;
488 // This class is here in order to be able to declare it a friend of
489 // HandleScope. Moving these methods to be members of HandleScope would be
490 // neat in some ways, but it would expose internal implementation details in
491 // our public header file, which is undesirable.
493 // An isolate has a single instance of this class to hold the current thread's
494 // data. In multithreaded V8 programs this data is copied in and out of storage
495 // so that the currently executing thread always has its own copy of this
497 class HandleScopeImplementer {
499 explicit HandleScopeImplementer(Isolate* isolate)
502 entered_contexts_(0),
506 last_handle_before_deferred_block_(NULL) { }
508 ~HandleScopeImplementer() {
512 // Threading support for handle data.
513 static int ArchiveSpacePerThread();
514 char* RestoreThread(char* from);
515 char* ArchiveThread(char* to);
516 void FreeThreadResources();
518 // Garbage collection support.
519 void Iterate(v8::internal::ObjectVisitor* v);
520 static char* Iterate(v8::internal::ObjectVisitor* v, char* data);
523 inline internal::Object** GetSpareOrNewBlock();
524 inline void DeleteExtensions(internal::Object** prev_limit);
526 inline void IncrementCallDepth() {call_depth_++;}
527 inline void DecrementCallDepth() {call_depth_--;}
528 inline bool CallDepthIsZero() { return call_depth_ == 0; }
530 inline void EnterContext(Handle<Context> context);
531 inline void LeaveContext();
532 inline bool LastEnteredContextWas(Handle<Context> context);
534 // Returns the last entered context or an empty handle if no
535 // contexts have been entered.
536 inline Handle<Context> LastEnteredContext();
538 inline void SaveContext(Context* context);
539 inline Context* RestoreContext();
540 inline bool HasSavedContexts();
542 inline List<internal::Object**>* blocks() { return &blocks_; }
543 Isolate* isolate() const { return isolate_; }
545 void ReturnBlock(Object** block) {
546 DCHECK(block != NULL);
547 if (spare_ != NULL) DeleteArray(spare_);
552 void ResetAfterArchive() {
553 blocks_.Initialize(0);
554 entered_contexts_.Initialize(0);
555 saved_contexts_.Initialize(0);
557 last_handle_before_deferred_block_ = NULL;
562 DCHECK(blocks_.length() == 0);
563 DCHECK(entered_contexts_.length() == 0);
564 DCHECK(saved_contexts_.length() == 0);
566 entered_contexts_.Free();
567 saved_contexts_.Free();
568 if (spare_ != NULL) {
572 DCHECK(call_depth_ == 0);
575 void BeginDeferredScope();
576 DeferredHandles* Detach(Object** prev_limit);
579 List<internal::Object**> blocks_;
580 // Used as a stack to keep track of entered contexts.
581 List<Context*> entered_contexts_;
582 // Used as a stack to keep track of saved contexts.
583 List<Context*> saved_contexts_;
586 Object** last_handle_before_deferred_block_;
587 // This is only used for threading support.
588 HandleScopeData handle_scope_data_;
590 void IterateThis(ObjectVisitor* v);
591 char* RestoreThreadHelper(char* from);
592 char* ArchiveThreadHelper(char* to);
594 friend class DeferredHandles;
595 friend class DeferredHandleScope;
597 DISALLOW_COPY_AND_ASSIGN(HandleScopeImplementer);
601 const int kHandleBlockSize = v8::internal::KB - 2; // fit in one page
604 void HandleScopeImplementer::SaveContext(Context* context) {
605 saved_contexts_.Add(context);
609 Context* HandleScopeImplementer::RestoreContext() {
610 return saved_contexts_.RemoveLast();
614 bool HandleScopeImplementer::HasSavedContexts() {
615 return !saved_contexts_.is_empty();
619 void HandleScopeImplementer::EnterContext(Handle<Context> context) {
620 entered_contexts_.Add(*context);
624 void HandleScopeImplementer::LeaveContext() {
625 entered_contexts_.RemoveLast();
629 bool HandleScopeImplementer::LastEnteredContextWas(Handle<Context> context) {
630 return !entered_contexts_.is_empty() && entered_contexts_.last() == *context;
634 Handle<Context> HandleScopeImplementer::LastEnteredContext() {
635 if (entered_contexts_.is_empty()) return Handle<Context>::null();
636 return Handle<Context>(entered_contexts_.last());
640 // If there's a spare block, use it for growing the current scope.
641 internal::Object** HandleScopeImplementer::GetSpareOrNewBlock() {
642 internal::Object** block = (spare_ != NULL) ?
644 NewArray<internal::Object*>(kHandleBlockSize);
650 void HandleScopeImplementer::DeleteExtensions(internal::Object** prev_limit) {
651 while (!blocks_.is_empty()) {
652 internal::Object** block_start = blocks_.last();
653 internal::Object** block_limit = block_start + kHandleBlockSize;
655 // SealHandleScope may make the prev_limit to point inside the block.
656 if (block_start <= prev_limit && prev_limit <= block_limit) {
657 #ifdef ENABLE_HANDLE_ZAPPING
658 internal::HandleScope::ZapRange(prev_limit, block_limit);
663 if (prev_limit == block_limit) break;
666 blocks_.RemoveLast();
667 #ifdef ENABLE_HANDLE_ZAPPING
668 internal::HandleScope::ZapRange(block_start, block_limit);
670 if (spare_ != NULL) {
673 spare_ = block_start;
675 DCHECK((blocks_.is_empty() && prev_limit == NULL) ||
676 (!blocks_.is_empty() && prev_limit != NULL));
680 // Interceptor functions called from generated inline caches to notify
681 // CPU profiler that external callbacks are invoked.
682 void InvokeAccessorGetterCallback(
683 v8::Local<v8::String> property,
684 const v8::PropertyCallbackInfo<v8::Value>& info,
685 v8::AccessorGetterCallback getter);
687 void InvokeFunctionCallback(const v8::FunctionCallbackInfo<v8::Value>& info,
688 v8::FunctionCallback callback);
692 static v8::Testing::StressType stress_type() { return stress_type_; }
693 static void set_stress_type(v8::Testing::StressType stress_type) {
694 stress_type_ = stress_type;
698 static v8::Testing::StressType stress_type_;
701 } } // namespace v8::internal