| // Copyright 2014 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. |
| |
| #include "src/objects/lookup.h" |
| |
| #include "src/common/globals.h" |
| #include "src/deoptimizer/deoptimizer.h" |
| #include "src/execution/isolate-inl.h" |
| #include "src/execution/protectors-inl.h" |
| #include "src/init/bootstrapper.h" |
| #include "src/logging/counters.h" |
| #include "src/objects/arguments-inl.h" |
| #include "src/objects/elements.h" |
| #include "src/objects/field-type.h" |
| #include "src/objects/hash-table-inl.h" |
| #include "src/objects/heap-number-inl.h" |
| #include "src/objects/ordered-hash-table.h" |
| #include "src/objects/struct-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| LookupIterator::Key::Key(Isolate* isolate, Handle<Object> key, bool* success) { |
| if (key->ToIntegerIndex(&index_)) { |
| *success = true; |
| return; |
| } |
| *success = Object::ToName(isolate, key).ToHandle(&name_); |
| if (!*success) { |
| DCHECK(isolate->has_pending_exception()); |
| index_ = kInvalidIndex; |
| return; |
| } |
| if (!name_->AsIntegerIndex(&index_)) { |
| // {AsIntegerIndex} may modify {index_} before deciding to fail. |
| index_ = LookupIterator::kInvalidIndex; |
| } |
| } |
| |
| LookupIterator::LookupIterator(Isolate* isolate, Handle<Object> receiver, |
| Handle<Name> name, Handle<Map> transition_map, |
| PropertyDetails details, bool has_property) |
| : configuration_(DEFAULT), |
| state_(TRANSITION), |
| has_property_(has_property), |
| interceptor_state_(InterceptorState::kUninitialized), |
| property_details_(details), |
| isolate_(isolate), |
| name_(name), |
| transition_(transition_map), |
| receiver_(receiver), |
| lookup_start_object_(receiver), |
| index_(kInvalidIndex) { |
| holder_ = GetRoot(isolate, lookup_start_object_); |
| } |
| |
| template <bool is_element> |
| void LookupIterator::Start() { |
| // GetRoot might allocate if lookup_start_object_ is a string. |
| holder_ = GetRoot(isolate_, lookup_start_object_, index_); |
| |
| { |
| DisallowHeapAllocation no_gc; |
| |
| has_property_ = false; |
| state_ = NOT_FOUND; |
| |
| JSReceiver holder = *holder_; |
| Map map = holder.map(isolate_); |
| |
| state_ = LookupInHolder<is_element>(map, holder); |
| if (IsFound()) return; |
| |
| NextInternal<is_element>(map, holder); |
| } |
| } |
| |
| template void LookupIterator::Start<true>(); |
| template void LookupIterator::Start<false>(); |
| |
| void LookupIterator::Next() { |
| DCHECK_NE(JSPROXY, state_); |
| DCHECK_NE(TRANSITION, state_); |
| DisallowHeapAllocation no_gc; |
| has_property_ = false; |
| |
| JSReceiver holder = *holder_; |
| Map map = holder.map(isolate_); |
| |
| if (map.IsSpecialReceiverMap()) { |
| state_ = IsElement() ? LookupInSpecialHolder<true>(map, holder) |
| : LookupInSpecialHolder<false>(map, holder); |
| if (IsFound()) return; |
| } |
| |
| IsElement() ? NextInternal<true>(map, holder) |
| : NextInternal<false>(map, holder); |
| } |
| |
| template <bool is_element> |
| void LookupIterator::NextInternal(Map map, JSReceiver holder) { |
| do { |
| JSReceiver maybe_holder = NextHolder(map); |
| if (maybe_holder.is_null()) { |
| if (interceptor_state_ == InterceptorState::kSkipNonMasking) { |
| RestartLookupForNonMaskingInterceptors<is_element>(); |
| return; |
| } |
| state_ = NOT_FOUND; |
| if (holder != *holder_) holder_ = handle(holder, isolate_); |
| return; |
| } |
| holder = maybe_holder; |
| map = holder.map(isolate_); |
| state_ = LookupInHolder<is_element>(map, holder); |
| } while (!IsFound()); |
| |
| holder_ = handle(holder, isolate_); |
| } |
| |
| template <bool is_element> |
| void LookupIterator::RestartInternal(InterceptorState interceptor_state) { |
| interceptor_state_ = interceptor_state; |
| property_details_ = PropertyDetails::Empty(); |
| number_ = InternalIndex::NotFound(); |
| Start<is_element>(); |
| } |
| |
| template void LookupIterator::RestartInternal<true>(InterceptorState); |
| template void LookupIterator::RestartInternal<false>(InterceptorState); |
| |
| // static |
| Handle<JSReceiver> LookupIterator::GetRootForNonJSReceiver( |
| Isolate* isolate, Handle<Object> lookup_start_object, size_t index) { |
| // Strings are the only objects with properties (only elements) directly on |
| // the wrapper. Hence we can skip generating the wrapper for all other cases. |
| if (lookup_start_object->IsString(isolate) && |
| index < |
| static_cast<size_t>(String::cast(*lookup_start_object).length())) { |
| // TODO(verwaest): Speed this up. Perhaps use a cached wrapper on the native |
| // context, ensuring that we don't leak it into JS? |
| Handle<JSFunction> constructor = isolate->string_function(); |
| Handle<JSObject> result = isolate->factory()->NewJSObject(constructor); |
| Handle<JSPrimitiveWrapper>::cast(result)->set_value(*lookup_start_object); |
| return result; |
| } |
| Handle<HeapObject> root( |
| lookup_start_object->GetPrototypeChainRootMap(isolate).prototype(isolate), |
| isolate); |
| if (root->IsNull(isolate)) { |
| isolate->PushStackTraceAndDie( |
| reinterpret_cast<void*>(lookup_start_object->ptr())); |
| } |
| return Handle<JSReceiver>::cast(root); |
| } |
| |
| Handle<Map> LookupIterator::GetReceiverMap() const { |
| if (receiver_->IsNumber(isolate_)) return factory()->heap_number_map(); |
| return handle(Handle<HeapObject>::cast(receiver_)->map(isolate_), isolate_); |
| } |
| |
| bool LookupIterator::HasAccess() const { |
| DCHECK_EQ(ACCESS_CHECK, state_); |
| return isolate_->MayAccess(handle(isolate_->context(), isolate_), |
| GetHolder<JSObject>()); |
| } |
| |
| template <bool is_element> |
| void LookupIterator::ReloadPropertyInformation() { |
| state_ = BEFORE_PROPERTY; |
| interceptor_state_ = InterceptorState::kUninitialized; |
| state_ = LookupInHolder<is_element>(holder_->map(isolate_), *holder_); |
| DCHECK(IsFound() || !holder_->HasFastProperties(isolate_)); |
| } |
| |
| namespace { |
| |
| bool IsTypedArrayFunctionInAnyContext(Isolate* isolate, HeapObject object) { |
| static uint32_t context_slots[] = { |
| #define TYPED_ARRAY_CONTEXT_SLOTS(Type, type, TYPE, ctype) \ |
| Context::TYPE##_ARRAY_FUN_INDEX, |
| |
| TYPED_ARRAYS(TYPED_ARRAY_CONTEXT_SLOTS) |
| #undef TYPED_ARRAY_CONTEXT_SLOTS |
| }; |
| |
| if (!object.IsJSFunction(isolate)) return false; |
| |
| return std::any_of( |
| std::begin(context_slots), std::end(context_slots), |
| [=](uint32_t slot) { return isolate->IsInAnyContext(object, slot); }); |
| } |
| |
| } // namespace |
| |
| // static |
| void LookupIterator::InternalUpdateProtector(Isolate* isolate, |
| Handle<Object> receiver_generic, |
| Handle<Name> name) { |
| if (isolate->bootstrapper()->IsActive()) return; |
| if (!receiver_generic->IsHeapObject()) return; |
| Handle<HeapObject> receiver = Handle<HeapObject>::cast(receiver_generic); |
| |
| ReadOnlyRoots roots(isolate); |
| if (*name == roots.constructor_string()) { |
| if (!Protectors::IsArraySpeciesLookupChainIntact(isolate) && |
| !Protectors::IsPromiseSpeciesLookupChainIntact(isolate) && |
| !Protectors::IsRegExpSpeciesLookupChainIntact(isolate) && |
| !Protectors::IsTypedArraySpeciesLookupChainIntact(isolate)) { |
| return; |
| } |
| // Setting the constructor property could change an instance's @@species |
| if (receiver->IsJSArray(isolate)) { |
| if (!Protectors::IsArraySpeciesLookupChainIntact(isolate)) return; |
| isolate->CountUsage( |
| v8::Isolate::UseCounterFeature::kArrayInstanceConstructorModified); |
| Protectors::InvalidateArraySpeciesLookupChain(isolate); |
| return; |
| } else if (receiver->IsJSPromise(isolate)) { |
| if (!Protectors::IsPromiseSpeciesLookupChainIntact(isolate)) return; |
| Protectors::InvalidatePromiseSpeciesLookupChain(isolate); |
| return; |
| } else if (receiver->IsJSRegExp(isolate)) { |
| if (!Protectors::IsRegExpSpeciesLookupChainIntact(isolate)) return; |
| Protectors::InvalidateRegExpSpeciesLookupChain(isolate); |
| return; |
| } else if (receiver->IsJSTypedArray(isolate)) { |
| if (!Protectors::IsTypedArraySpeciesLookupChainIntact(isolate)) return; |
| Protectors::InvalidateTypedArraySpeciesLookupChain(isolate); |
| return; |
| } |
| if (receiver->map(isolate).is_prototype_map()) { |
| DisallowHeapAllocation no_gc; |
| // Setting the constructor of any prototype with the @@species protector |
| // (of any realm) also needs to invalidate the protector. |
| // For typed arrays, we check a prototype of this receiver since |
| // TypedArrays have different prototypes for each type, and their parent |
| // prototype is pointing the same TYPED_ARRAY_PROTOTYPE. |
| if (isolate->IsInAnyContext(*receiver, |
| Context::INITIAL_ARRAY_PROTOTYPE_INDEX)) { |
| if (!Protectors::IsArraySpeciesLookupChainIntact(isolate)) return; |
| isolate->CountUsage( |
| v8::Isolate::UseCounterFeature::kArrayPrototypeConstructorModified); |
| Protectors::InvalidateArraySpeciesLookupChain(isolate); |
| } else if (isolate->IsInAnyContext(*receiver, |
| Context::PROMISE_PROTOTYPE_INDEX)) { |
| if (!Protectors::IsPromiseSpeciesLookupChainIntact(isolate)) return; |
| Protectors::InvalidatePromiseSpeciesLookupChain(isolate); |
| } else if (isolate->IsInAnyContext(*receiver, |
| Context::REGEXP_PROTOTYPE_INDEX)) { |
| if (!Protectors::IsRegExpSpeciesLookupChainIntact(isolate)) return; |
| Protectors::InvalidateRegExpSpeciesLookupChain(isolate); |
| } else if (isolate->IsInAnyContext( |
| receiver->map(isolate).prototype(isolate), |
| Context::TYPED_ARRAY_PROTOTYPE_INDEX)) { |
| if (!Protectors::IsTypedArraySpeciesLookupChainIntact(isolate)) return; |
| Protectors::InvalidateTypedArraySpeciesLookupChain(isolate); |
| } |
| } |
| } else if (*name == roots.next_string()) { |
| if (receiver->IsJSArrayIterator() || |
| isolate->IsInAnyContext( |
| *receiver, Context::INITIAL_ARRAY_ITERATOR_PROTOTYPE_INDEX)) { |
| // Setting the next property of %ArrayIteratorPrototype% also needs to |
| // invalidate the array iterator protector. |
| if (!Protectors::IsArrayIteratorLookupChainIntact(isolate)) return; |
| Protectors::InvalidateArrayIteratorLookupChain(isolate); |
| } else if (receiver->IsJSMapIterator() || |
| isolate->IsInAnyContext( |
| *receiver, Context::INITIAL_MAP_ITERATOR_PROTOTYPE_INDEX)) { |
| if (!Protectors::IsMapIteratorLookupChainIntact(isolate)) return; |
| Protectors::InvalidateMapIteratorLookupChain(isolate); |
| } else if (receiver->IsJSSetIterator() || |
| isolate->IsInAnyContext( |
| *receiver, Context::INITIAL_SET_ITERATOR_PROTOTYPE_INDEX)) { |
| if (!Protectors::IsSetIteratorLookupChainIntact(isolate)) return; |
| Protectors::InvalidateSetIteratorLookupChain(isolate); |
| } else if (receiver->IsJSStringIterator() || |
| isolate->IsInAnyContext( |
| *receiver, |
| Context::INITIAL_STRING_ITERATOR_PROTOTYPE_INDEX)) { |
| // Setting the next property of %StringIteratorPrototype% invalidates the |
| // string iterator protector. |
| if (!Protectors::IsStringIteratorLookupChainIntact(isolate)) return; |
| Protectors::InvalidateStringIteratorLookupChain(isolate); |
| } |
| } else if (*name == roots.species_symbol()) { |
| if (!Protectors::IsArraySpeciesLookupChainIntact(isolate) && |
| !Protectors::IsPromiseSpeciesLookupChainIntact(isolate) && |
| !Protectors::IsRegExpSpeciesLookupChainIntact(isolate) && |
| !Protectors::IsTypedArraySpeciesLookupChainIntact(isolate)) { |
| return; |
| } |
| // Setting the Symbol.species property of any Array, Promise or TypedArray |
| // constructor invalidates the @@species protector |
| if (isolate->IsInAnyContext(*receiver, Context::ARRAY_FUNCTION_INDEX)) { |
| if (!Protectors::IsArraySpeciesLookupChainIntact(isolate)) return; |
| isolate->CountUsage( |
| v8::Isolate::UseCounterFeature::kArraySpeciesModified); |
| Protectors::InvalidateArraySpeciesLookupChain(isolate); |
| } else if (isolate->IsInAnyContext(*receiver, |
| Context::PROMISE_FUNCTION_INDEX)) { |
| if (!Protectors::IsPromiseSpeciesLookupChainIntact(isolate)) return; |
| Protectors::InvalidatePromiseSpeciesLookupChain(isolate); |
| } else if (isolate->IsInAnyContext(*receiver, |
| Context::REGEXP_FUNCTION_INDEX)) { |
| if (!Protectors::IsRegExpSpeciesLookupChainIntact(isolate)) return; |
| Protectors::InvalidateRegExpSpeciesLookupChain(isolate); |
| } else if (IsTypedArrayFunctionInAnyContext(isolate, *receiver)) { |
| if (!Protectors::IsTypedArraySpeciesLookupChainIntact(isolate)) return; |
| Protectors::InvalidateTypedArraySpeciesLookupChain(isolate); |
| } |
| } else if (*name == roots.is_concat_spreadable_symbol()) { |
| if (!Protectors::IsIsConcatSpreadableLookupChainIntact(isolate)) return; |
| Protectors::InvalidateIsConcatSpreadableLookupChain(isolate); |
| } else if (*name == roots.iterator_symbol()) { |
| if (receiver->IsJSArray(isolate)) { |
| if (!Protectors::IsArrayIteratorLookupChainIntact(isolate)) return; |
| Protectors::InvalidateArrayIteratorLookupChain(isolate); |
| } else if (receiver->IsJSSet(isolate) || receiver->IsJSSetIterator() || |
| isolate->IsInAnyContext( |
| *receiver, Context::INITIAL_SET_ITERATOR_PROTOTYPE_INDEX) || |
| isolate->IsInAnyContext(*receiver, |
| Context::INITIAL_SET_PROTOTYPE_INDEX)) { |
| if (Protectors::IsSetIteratorLookupChainIntact(isolate)) { |
| Protectors::InvalidateSetIteratorLookupChain(isolate); |
| } |
| } else if (receiver->IsJSMapIterator() || |
| isolate->IsInAnyContext( |
| *receiver, Context::INITIAL_MAP_ITERATOR_PROTOTYPE_INDEX)) { |
| if (Protectors::IsMapIteratorLookupChainIntact(isolate)) { |
| Protectors::InvalidateMapIteratorLookupChain(isolate); |
| } |
| } else if (isolate->IsInAnyContext( |
| *receiver, Context::INITIAL_ITERATOR_PROTOTYPE_INDEX)) { |
| if (Protectors::IsMapIteratorLookupChainIntact(isolate)) { |
| Protectors::InvalidateMapIteratorLookupChain(isolate); |
| } |
| if (Protectors::IsSetIteratorLookupChainIntact(isolate)) { |
| Protectors::InvalidateSetIteratorLookupChain(isolate); |
| } |
| } else if (isolate->IsInAnyContext( |
| *receiver, Context::INITIAL_STRING_PROTOTYPE_INDEX)) { |
| // Setting the Symbol.iterator property of String.prototype invalidates |
| // the string iterator protector. Symbol.iterator can also be set on a |
| // String wrapper, but not on a primitive string. We only support |
| // protector for primitive strings. |
| if (!Protectors::IsStringIteratorLookupChainIntact(isolate)) return; |
| Protectors::InvalidateStringIteratorLookupChain(isolate); |
| } |
| } else if (*name == roots.resolve_string()) { |
| if (!Protectors::IsPromiseResolveLookupChainIntact(isolate)) return; |
| // Setting the "resolve" property on any %Promise% intrinsic object |
| // invalidates the Promise.resolve protector. |
| if (isolate->IsInAnyContext(*receiver, Context::PROMISE_FUNCTION_INDEX)) { |
| Protectors::InvalidatePromiseResolveLookupChain(isolate); |
| } |
| } else if (*name == roots.then_string()) { |
| if (!Protectors::IsPromiseThenLookupChainIntact(isolate)) return; |
| // Setting the "then" property on any JSPromise instance or on the |
| // initial %PromisePrototype% invalidates the Promise#then protector. |
| // Also setting the "then" property on the initial %ObjectPrototype% |
| // invalidates the Promise#then protector, since we use this protector |
| // to guard the fast-path in AsyncGeneratorResolve, where we can skip |
| // the ResolvePromise step and go directly to FulfillPromise if we |
| // know that the Object.prototype doesn't contain a "then" method. |
| if (receiver->IsJSPromise(isolate) || |
| isolate->IsInAnyContext(*receiver, |
| Context::INITIAL_OBJECT_PROTOTYPE_INDEX) || |
| isolate->IsInAnyContext(*receiver, Context::PROMISE_PROTOTYPE_INDEX)) { |
| Protectors::InvalidatePromiseThenLookupChain(isolate); |
| } |
| } |
| } |
| |
| void LookupIterator::PrepareForDataProperty(Handle<Object> value) { |
| DCHECK(state_ == DATA || state_ == ACCESSOR); |
| DCHECK(HolderIsReceiverOrHiddenPrototype()); |
| |
| Handle<JSReceiver> holder = GetHolder<JSReceiver>(); |
| // JSProxy does not have fast properties so we do an early return. |
| DCHECK_IMPLIES(holder->IsJSProxy(isolate_), |
| !holder->HasFastProperties(isolate_)); |
| DCHECK_IMPLIES(holder->IsJSProxy(isolate_), name()->IsPrivate(isolate_)); |
| if (holder->IsJSProxy(isolate_)) return; |
| |
| Handle<JSObject> holder_obj = Handle<JSObject>::cast(holder); |
| |
| if (IsElement(*holder)) { |
| ElementsKind kind = holder_obj->GetElementsKind(isolate_); |
| ElementsKind to = value->OptimalElementsKind(isolate_); |
| if (IsHoleyElementsKind(kind)) to = GetHoleyElementsKind(to); |
| to = GetMoreGeneralElementsKind(kind, to); |
| |
| if (kind != to) { |
| JSObject::TransitionElementsKind(holder_obj, to); |
| } |
| |
| // Copy the backing store if it is copy-on-write. |
| if (IsSmiOrObjectElementsKind(to) || IsSealedElementsKind(to) || |
| IsNonextensibleElementsKind(to)) { |
| JSObject::EnsureWritableFastElements(holder_obj); |
| } |
| return; |
| } |
| |
| if (holder_obj->IsJSGlobalObject(isolate_)) { |
| Handle<GlobalDictionary> dictionary( |
| JSGlobalObject::cast(*holder_obj).global_dictionary(isolate_), |
| isolate()); |
| Handle<PropertyCell> cell(dictionary->CellAt(isolate_, dictionary_entry()), |
| isolate()); |
| property_details_ = cell->property_details(); |
| PropertyCell::PrepareForValue(isolate(), dictionary, dictionary_entry(), |
| value, property_details_); |
| return; |
| } |
| if (!holder_obj->HasFastProperties(isolate_)) return; |
| |
| PropertyConstness new_constness = PropertyConstness::kConst; |
| if (constness() == PropertyConstness::kConst) { |
| DCHECK_EQ(kData, property_details_.kind()); |
| // Check that current value matches new value otherwise we should make |
| // the property mutable. |
| if (!IsConstFieldValueEqualTo(*value)) |
| new_constness = PropertyConstness::kMutable; |
| } |
| |
| Handle<Map> old_map(holder_obj->map(isolate_), isolate_); |
| DCHECK(!old_map->is_dictionary_map()); |
| |
| Handle<Map> new_map = Map::Update(isolate_, old_map); |
| if (!new_map->is_dictionary_map()) { |
| new_map = Map::PrepareForDataProperty( |
| isolate(), new_map, descriptor_number(), new_constness, value); |
| |
| if (old_map.is_identical_to(new_map)) { |
| // Update the property details if the representation was None. |
| if (constness() != new_constness || representation().IsNone()) { |
| property_details_ = |
| new_map->instance_descriptors(isolate_, kRelaxedLoad) |
| .GetDetails(descriptor_number()); |
| } |
| return; |
| } |
| } |
| // We should only get here if the new_map is different from the old map, |
| // otherwise we would have falled through to the is_identical_to check above. |
| DCHECK_NE(*old_map, *new_map); |
| |
| JSObject::MigrateToMap(isolate_, holder_obj, new_map); |
| ReloadPropertyInformation<false>(); |
| } |
| |
| void LookupIterator::ReconfigureDataProperty(Handle<Object> value, |
| PropertyAttributes attributes) { |
| DCHECK(state_ == DATA || state_ == ACCESSOR); |
| DCHECK(HolderIsReceiverOrHiddenPrototype()); |
| |
| Handle<JSReceiver> holder = GetHolder<JSReceiver>(); |
| |
| // Property details can never change for private properties. |
| if (holder->IsJSProxy(isolate_)) { |
| DCHECK(name()->IsPrivate(isolate_)); |
| return; |
| } |
| |
| Handle<JSObject> holder_obj = Handle<JSObject>::cast(holder); |
| if (IsElement(*holder)) { |
| DCHECK(!holder_obj->HasTypedArrayElements(isolate_)); |
| DCHECK(attributes != NONE || !holder_obj->HasFastElements(isolate_)); |
| Handle<FixedArrayBase> elements(holder_obj->elements(isolate_), isolate()); |
| holder_obj->GetElementsAccessor(isolate_)->Reconfigure( |
| holder_obj, elements, number_, value, attributes); |
| ReloadPropertyInformation<true>(); |
| } else if (holder_obj->HasFastProperties(isolate_)) { |
| Handle<Map> old_map(holder_obj->map(isolate_), isolate_); |
| // Force mutable to avoid changing constant value by reconfiguring |
| // kData -> kAccessor -> kData. |
| Handle<Map> new_map = Map::ReconfigureExistingProperty( |
| isolate_, old_map, descriptor_number(), i::kData, attributes, |
| PropertyConstness::kMutable); |
| if (!new_map->is_dictionary_map()) { |
| // Make sure that the data property has a compatible representation. |
| // TODO(leszeks): Do this as part of ReconfigureExistingProperty. |
| new_map = |
| Map::PrepareForDataProperty(isolate(), new_map, descriptor_number(), |
| PropertyConstness::kMutable, value); |
| } |
| JSObject::MigrateToMap(isolate_, holder_obj, new_map); |
| ReloadPropertyInformation<false>(); |
| } |
| |
| if (!IsElement(*holder) && !holder_obj->HasFastProperties(isolate_)) { |
| PropertyDetails details(kData, attributes, PropertyCellType::kMutable); |
| if (holder_obj->map(isolate_).is_prototype_map() && |
| (property_details_.attributes() & READ_ONLY) == 0 && |
| (attributes & READ_ONLY) != 0) { |
| // Invalidate prototype validity cell when a property is reconfigured |
| // from writable to read-only as this may invalidate transitioning store |
| // IC handlers. |
| JSObject::InvalidatePrototypeChains(holder->map(isolate_)); |
| } |
| if (holder_obj->IsJSGlobalObject(isolate_)) { |
| Handle<GlobalDictionary> dictionary( |
| JSGlobalObject::cast(*holder_obj).global_dictionary(isolate_), |
| isolate()); |
| |
| Handle<PropertyCell> cell = PropertyCell::PrepareForValue( |
| isolate(), dictionary, dictionary_entry(), value, details); |
| cell->set_value(*value); |
| property_details_ = cell->property_details(); |
| } else { |
| if (V8_DICT_MODE_PROTOTYPES_BOOL) { |
| Handle<OrderedNameDictionary> dictionary( |
| holder_obj->property_dictionary_ordered(isolate_), isolate()); |
| dictionary->SetEntry(dictionary_entry(), *name(), *value, details); |
| DCHECK_EQ(details.AsSmi(), |
| dictionary->DetailsAt(dictionary_entry()).AsSmi()); |
| property_details_ = details; |
| } else { |
| Handle<NameDictionary> dictionary( |
| holder_obj->property_dictionary(isolate_), isolate()); |
| PropertyDetails original_details = |
| dictionary->DetailsAt(dictionary_entry()); |
| int enumeration_index = original_details.dictionary_index(); |
| DCHECK_GT(enumeration_index, 0); |
| details = details.set_index(enumeration_index); |
| dictionary->SetEntry(dictionary_entry(), *name(), *value, details); |
| property_details_ = details; |
| } |
| } |
| state_ = DATA; |
| } |
| |
| WriteDataValue(value, true); |
| |
| #if VERIFY_HEAP |
| if (FLAG_verify_heap) { |
| holder->HeapObjectVerify(isolate()); |
| } |
| #endif |
| } |
| |
| // Can only be called when the receiver is a JSObject. JSProxy has to be handled |
| // via a trap. Adding properties to primitive values is not observable. |
| void LookupIterator::PrepareTransitionToDataProperty( |
| Handle<JSReceiver> receiver, Handle<Object> value, |
| PropertyAttributes attributes, StoreOrigin store_origin) { |
| DCHECK_IMPLIES(receiver->IsJSProxy(isolate_), name()->IsPrivate(isolate_)); |
| DCHECK(receiver.is_identical_to(GetStoreTarget<JSReceiver>())); |
| if (state_ == TRANSITION) return; |
| |
| if (!IsElement() && name()->IsPrivate(isolate_)) { |
| attributes = static_cast<PropertyAttributes>(attributes | DONT_ENUM); |
| } |
| |
| DCHECK(state_ != LookupIterator::ACCESSOR || |
| (GetAccessors()->IsAccessorInfo(isolate_) && |
| AccessorInfo::cast(*GetAccessors()).is_special_data_property())); |
| DCHECK_NE(INTEGER_INDEXED_EXOTIC, state_); |
| DCHECK(state_ == NOT_FOUND || !HolderIsReceiverOrHiddenPrototype()); |
| |
| Handle<Map> map(receiver->map(isolate_), isolate_); |
| |
| // Dictionary maps can always have additional data properties. |
| if (map->is_dictionary_map()) { |
| state_ = TRANSITION; |
| if (map->IsJSGlobalObjectMap()) { |
| Handle<PropertyCell> cell = isolate_->factory()->NewPropertyCell(name()); |
| DCHECK(cell->value(isolate_).IsTheHole(isolate_)); |
| DCHECK(!value->IsTheHole(isolate_)); |
| // Don't set enumeration index (it will be set during value store). |
| property_details_ = PropertyDetails( |
| kData, attributes, |
| PropertyCell::TypeForUninitializedCell(isolate_, value)); |
| |
| transition_ = cell; |
| has_property_ = true; |
| } else { |
| // Don't set enumeration index (it will be set during value store). |
| property_details_ = |
| PropertyDetails(kData, attributes, PropertyCellType::kNoCell); |
| transition_ = map; |
| } |
| return; |
| } |
| |
| Handle<Map> transition = |
| Map::TransitionToDataProperty(isolate_, map, name_, value, attributes, |
| PropertyConstness::kConst, store_origin); |
| state_ = TRANSITION; |
| transition_ = transition; |
| |
| if (transition->is_dictionary_map()) { |
| // Don't set enumeration index (it will be set during value store). |
| property_details_ = |
| PropertyDetails(kData, attributes, PropertyCellType::kNoCell); |
| } else { |
| property_details_ = transition->GetLastDescriptorDetails(isolate_); |
| has_property_ = true; |
| } |
| } |
| |
| void LookupIterator::ApplyTransitionToDataProperty( |
| Handle<JSReceiver> receiver) { |
| DCHECK_EQ(TRANSITION, state_); |
| |
| DCHECK(receiver.is_identical_to(GetStoreTarget<JSReceiver>())); |
| holder_ = receiver; |
| if (receiver->IsJSGlobalObject(isolate_)) { |
| JSObject::InvalidatePrototypeChains(receiver->map(isolate_)); |
| |
| // Install a property cell. |
| Handle<JSGlobalObject> global = Handle<JSGlobalObject>::cast(receiver); |
| DCHECK(!global->HasFastProperties()); |
| Handle<GlobalDictionary> dictionary(global->global_dictionary(isolate_), |
| isolate_); |
| |
| dictionary = |
| GlobalDictionary::Add(isolate_, dictionary, name(), transition_cell(), |
| property_details_, &number_); |
| global->set_global_dictionary(*dictionary); |
| |
| // Reload details containing proper enumeration index value. |
| property_details_ = transition_cell()->property_details(); |
| has_property_ = true; |
| state_ = DATA; |
| return; |
| } |
| Handle<Map> transition = transition_map(); |
| bool simple_transition = |
| transition->GetBackPointer(isolate_) == receiver->map(isolate_); |
| |
| if (configuration_ == DEFAULT && !transition->is_dictionary_map() && |
| !transition->IsPrototypeValidityCellValid()) { |
| // Only LookupIterator instances with DEFAULT (full prototype chain) |
| // configuration can produce valid transition handler maps. |
| Handle<Object> validity_cell = |
| Map::GetOrCreatePrototypeChainValidityCell(transition, isolate()); |
| transition->set_prototype_validity_cell(*validity_cell); |
| } |
| |
| if (!receiver->IsJSProxy(isolate_)) { |
| JSObject::MigrateToMap(isolate_, Handle<JSObject>::cast(receiver), |
| transition); |
| } |
| |
| if (simple_transition) { |
| number_ = transition->LastAdded(); |
| property_details_ = transition->GetLastDescriptorDetails(isolate_); |
| state_ = DATA; |
| } else if (receiver->map(isolate_).is_dictionary_map()) { |
| if (receiver->map(isolate_).is_prototype_map() && |
| receiver->IsJSObject(isolate_)) { |
| JSObject::InvalidatePrototypeChains(receiver->map(isolate_)); |
| } |
| if (V8_DICT_MODE_PROTOTYPES_BOOL) { |
| Handle<OrderedNameDictionary> dictionary( |
| receiver->property_dictionary_ordered(isolate_), isolate_); |
| |
| dictionary = |
| OrderedNameDictionary::Add(isolate(), dictionary, name(), |
| isolate_->factory()->uninitialized_value(), |
| property_details_) |
| .ToHandleChecked(); |
| |
| // set to last used entry |
| number_ = InternalIndex(dictionary->UsedCapacity() - 1); |
| receiver->SetProperties(*dictionary); |
| } else { |
| Handle<NameDictionary> dictionary(receiver->property_dictionary(isolate_), |
| isolate_); |
| |
| dictionary = |
| NameDictionary::Add(isolate(), dictionary, name(), |
| isolate_->factory()->uninitialized_value(), |
| property_details_, &number_); |
| receiver->SetProperties(*dictionary); |
| // Reload details containing proper enumeration index value. |
| property_details_ = dictionary->DetailsAt(number_); |
| } |
| has_property_ = true; |
| state_ = DATA; |
| |
| } else { |
| ReloadPropertyInformation<false>(); |
| } |
| } |
| |
| void LookupIterator::Delete() { |
| Handle<JSReceiver> holder = Handle<JSReceiver>::cast(holder_); |
| if (IsElement(*holder)) { |
| Handle<JSObject> object = Handle<JSObject>::cast(holder); |
| ElementsAccessor* accessor = object->GetElementsAccessor(isolate_); |
| accessor->Delete(object, number_); |
| } else { |
| DCHECK(!name()->IsPrivateName(isolate_)); |
| bool is_prototype_map = holder->map(isolate_).is_prototype_map(); |
| RuntimeCallTimerScope stats_scope( |
| isolate_, is_prototype_map |
| ? RuntimeCallCounterId::kPrototypeObject_DeleteProperty |
| : RuntimeCallCounterId::kObject_DeleteProperty); |
| |
| PropertyNormalizationMode mode = |
| is_prototype_map ? KEEP_INOBJECT_PROPERTIES : CLEAR_INOBJECT_PROPERTIES; |
| |
| if (holder->HasFastProperties(isolate_)) { |
| JSObject::NormalizeProperties(isolate_, Handle<JSObject>::cast(holder), |
| mode, 0, "DeletingProperty"); |
| ReloadPropertyInformation<false>(); |
| } |
| JSReceiver::DeleteNormalizedProperty(holder, dictionary_entry()); |
| if (holder->IsJSObject(isolate_)) { |
| JSObject::ReoptimizeIfPrototype(Handle<JSObject>::cast(holder)); |
| } |
| } |
| state_ = NOT_FOUND; |
| } |
| |
| void LookupIterator::TransitionToAccessorProperty( |
| Handle<Object> getter, Handle<Object> setter, |
| PropertyAttributes attributes) { |
| DCHECK(!getter->IsNull(isolate_) || !setter->IsNull(isolate_)); |
| // Can only be called when the receiver is a JSObject. JSProxy has to be |
| // handled via a trap. Adding properties to primitive values is not |
| // observable. |
| Handle<JSObject> receiver = GetStoreTarget<JSObject>(); |
| if (!IsElement() && name()->IsPrivate(isolate_)) { |
| attributes = static_cast<PropertyAttributes>(attributes | DONT_ENUM); |
| } |
| |
| if (!IsElement(*receiver) && !receiver->map(isolate_).is_dictionary_map()) { |
| Handle<Map> old_map(receiver->map(isolate_), isolate_); |
| |
| if (!holder_.is_identical_to(receiver)) { |
| holder_ = receiver; |
| state_ = NOT_FOUND; |
| } else if (state_ == INTERCEPTOR) { |
| LookupInRegularHolder<false>(*old_map, *holder_); |
| } |
| // The case of IsFound() && number_.is_not_found() can occur for |
| // interceptors. |
| DCHECK_IMPLIES(!IsFound(), number_.is_not_found()); |
| |
| Handle<Map> new_map = Map::TransitionToAccessorProperty( |
| isolate_, old_map, name_, number_, getter, setter, attributes); |
| bool simple_transition = |
| new_map->GetBackPointer(isolate_) == receiver->map(isolate_); |
| JSObject::MigrateToMap(isolate_, receiver, new_map); |
| |
| if (simple_transition) { |
| number_ = new_map->LastAdded(); |
| property_details_ = new_map->GetLastDescriptorDetails(isolate_); |
| state_ = ACCESSOR; |
| return; |
| } |
| |
| ReloadPropertyInformation<false>(); |
| if (!new_map->is_dictionary_map()) return; |
| } |
| |
| Handle<AccessorPair> pair; |
| if (state() == ACCESSOR && GetAccessors()->IsAccessorPair(isolate_)) { |
| pair = Handle<AccessorPair>::cast(GetAccessors()); |
| // If the component and attributes are identical, nothing has to be done. |
| if (pair->Equals(*getter, *setter)) { |
| if (property_details().attributes() == attributes) { |
| if (!IsElement(*receiver)) JSObject::ReoptimizeIfPrototype(receiver); |
| return; |
| } |
| } else { |
| pair = AccessorPair::Copy(isolate(), pair); |
| pair->SetComponents(*getter, *setter); |
| } |
| } else { |
| pair = factory()->NewAccessorPair(); |
| pair->SetComponents(*getter, *setter); |
| } |
| |
| TransitionToAccessorPair(pair, attributes); |
| |
| #if VERIFY_HEAP |
| if (FLAG_verify_heap) { |
| receiver->JSObjectVerify(isolate()); |
| } |
| #endif |
| } |
| |
| void LookupIterator::TransitionToAccessorPair(Handle<Object> pair, |
| PropertyAttributes attributes) { |
| Handle<JSObject> receiver = GetStoreTarget<JSObject>(); |
| holder_ = receiver; |
| |
| PropertyDetails details(kAccessor, attributes, PropertyCellType::kMutable); |
| |
| if (IsElement(*receiver)) { |
| // TODO(verwaest): Move code into the element accessor. |
| isolate_->CountUsage(v8::Isolate::kIndexAccessor); |
| Handle<NumberDictionary> dictionary = JSObject::NormalizeElements(receiver); |
| |
| dictionary = NumberDictionary::Set(isolate_, dictionary, array_index(), |
| pair, receiver, details); |
| receiver->RequireSlowElements(*dictionary); |
| |
| if (receiver->HasSlowArgumentsElements(isolate_)) { |
| SloppyArgumentsElements parameter_map = |
| SloppyArgumentsElements::cast(receiver->elements(isolate_)); |
| uint32_t length = parameter_map.length(); |
| if (number_.is_found() && number_.as_uint32() < length) { |
| parameter_map.set_mapped_entries( |
| number_.as_int(), ReadOnlyRoots(isolate_).the_hole_value()); |
| } |
| parameter_map.set_arguments(*dictionary); |
| } else { |
| receiver->set_elements(*dictionary); |
| } |
| |
| ReloadPropertyInformation<true>(); |
| } else { |
| PropertyNormalizationMode mode = CLEAR_INOBJECT_PROPERTIES; |
| if (receiver->map(isolate_).is_prototype_map()) { |
| JSObject::InvalidatePrototypeChains(receiver->map(isolate_)); |
| mode = KEEP_INOBJECT_PROPERTIES; |
| } |
| |
| // Normalize object to make this operation simple. |
| JSObject::NormalizeProperties(isolate_, receiver, mode, 0, |
| "TransitionToAccessorPair"); |
| |
| JSObject::SetNormalizedProperty(receiver, name_, pair, details); |
| JSObject::ReoptimizeIfPrototype(receiver); |
| |
| ReloadPropertyInformation<false>(); |
| } |
| } |
| |
| bool LookupIterator::HolderIsReceiver() const { |
| DCHECK(has_property_ || state_ == INTERCEPTOR || state_ == JSPROXY); |
| // Optimization that only works if configuration_ is not mutable. |
| if (!check_prototype_chain()) return true; |
| return *receiver_ == *holder_; |
| } |
| |
| bool LookupIterator::HolderIsReceiverOrHiddenPrototype() const { |
| DCHECK(has_property_ || state_ == INTERCEPTOR || state_ == JSPROXY); |
| // Optimization that only works if configuration_ is not mutable. |
| if (!check_prototype_chain()) return true; |
| if (*receiver_ == *holder_) return true; |
| if (!receiver_->IsJSGlobalProxy(isolate_)) return false; |
| return Handle<JSGlobalProxy>::cast(receiver_)->map(isolate_).prototype( |
| isolate_) == *holder_; |
| } |
| |
| Handle<Object> LookupIterator::FetchValue( |
| AllocationPolicy allocation_policy) const { |
| Object result; |
| if (IsElement(*holder_)) { |
| Handle<JSObject> holder = GetHolder<JSObject>(); |
| ElementsAccessor* accessor = holder->GetElementsAccessor(isolate_); |
| return accessor->Get(holder, number_); |
| } else if (holder_->IsJSGlobalObject(isolate_)) { |
| Handle<JSGlobalObject> holder = GetHolder<JSGlobalObject>(); |
| result = holder->global_dictionary(isolate_).ValueAt(isolate_, |
| dictionary_entry()); |
| } else if (!holder_->HasFastProperties(isolate_)) { |
| if (V8_DICT_MODE_PROTOTYPES_BOOL) { |
| result = holder_->property_dictionary_ordered(isolate_).ValueAt( |
| dictionary_entry()); |
| } else { |
| result = holder_->property_dictionary(isolate_).ValueAt( |
| isolate_, dictionary_entry()); |
| } |
| } else if (property_details_.location() == kField) { |
| DCHECK_EQ(kData, property_details_.kind()); |
| Handle<JSObject> holder = GetHolder<JSObject>(); |
| FieldIndex field_index = |
| FieldIndex::ForDescriptor(holder->map(isolate_), descriptor_number()); |
| if (allocation_policy == AllocationPolicy::kAllocationDisallowed && |
| field_index.is_inobject() && field_index.is_double()) { |
| return isolate_->factory()->undefined_value(); |
| } |
| return JSObject::FastPropertyAt(holder, property_details_.representation(), |
| field_index); |
| } else { |
| result = holder_->map(isolate_) |
| .instance_descriptors(isolate_, kRelaxedLoad) |
| .GetStrongValue(isolate_, descriptor_number()); |
| } |
| return handle(result, isolate_); |
| } |
| |
| bool LookupIterator::IsConstFieldValueEqualTo(Object value) const { |
| DCHECK(!IsElement(*holder_)); |
| DCHECK(holder_->HasFastProperties(isolate_)); |
| DCHECK_EQ(kField, property_details_.location()); |
| DCHECK_EQ(PropertyConstness::kConst, property_details_.constness()); |
| if (value.IsUninitialized(isolate())) { |
| // Storing uninitialized value means that we are preparing for a computed |
| // property value in an object literal. The initializing store will follow |
| // and it will properly update constness based on the actual value. |
| return true; |
| } |
| Handle<JSObject> holder = GetHolder<JSObject>(); |
| FieldIndex field_index = |
| FieldIndex::ForDescriptor(holder->map(isolate_), descriptor_number()); |
| if (property_details_.representation().IsDouble()) { |
| if (!value.IsNumber(isolate_)) return false; |
| uint64_t bits; |
| if (holder->IsUnboxedDoubleField(isolate_, field_index)) { |
| bits = holder->RawFastDoublePropertyAsBitsAt(field_index); |
| } else { |
| Object current_value = holder->RawFastPropertyAt(isolate_, field_index); |
| DCHECK(current_value.IsHeapNumber(isolate_)); |
| bits = HeapNumber::cast(current_value).value_as_bits(); |
| } |
| // Use bit representation of double to check for hole double, since |
| // manipulating the signaling NaN used for the hole in C++, e.g. with |
| // bit_cast or value(), will change its value on ia32 (the x87 stack is |
| // used to return values and stores to the stack silently clear the |
| // signalling bit). |
| if (bits == kHoleNanInt64) { |
| // Uninitialized double field. |
| return true; |
| } |
| return Object::SameNumberValue(bit_cast<double>(bits), value.Number()); |
| } else { |
| Object current_value = holder->RawFastPropertyAt(isolate_, field_index); |
| if (current_value.IsUninitialized(isolate()) || current_value == value) { |
| return true; |
| } |
| return current_value.IsNumber(isolate_) && value.IsNumber(isolate_) && |
| Object::SameNumberValue(current_value.Number(), value.Number()); |
| } |
| } |
| |
| int LookupIterator::GetFieldDescriptorIndex() const { |
| DCHECK(has_property_); |
| DCHECK(holder_->HasFastProperties()); |
| DCHECK_EQ(kField, property_details_.location()); |
| DCHECK_EQ(kData, property_details_.kind()); |
| // TODO(jkummerow): Propagate InternalIndex further. |
| return descriptor_number().as_int(); |
| } |
| |
| int LookupIterator::GetAccessorIndex() const { |
| DCHECK(has_property_); |
| DCHECK(holder_->HasFastProperties(isolate_)); |
| DCHECK_EQ(kDescriptor, property_details_.location()); |
| DCHECK_EQ(kAccessor, property_details_.kind()); |
| return descriptor_number().as_int(); |
| } |
| |
| Handle<Map> LookupIterator::GetFieldOwnerMap() const { |
| DCHECK(has_property_); |
| DCHECK(holder_->HasFastProperties(isolate_)); |
| DCHECK_EQ(kField, property_details_.location()); |
| DCHECK(!IsElement(*holder_)); |
| Map holder_map = holder_->map(isolate_); |
| return handle(holder_map.FindFieldOwner(isolate(), descriptor_number()), |
| isolate_); |
| } |
| |
| FieldIndex LookupIterator::GetFieldIndex() const { |
| DCHECK(has_property_); |
| DCHECK(holder_->HasFastProperties(isolate_)); |
| DCHECK_EQ(kField, property_details_.location()); |
| DCHECK(!IsElement(*holder_)); |
| return FieldIndex::ForDescriptor(holder_->map(isolate_), descriptor_number()); |
| } |
| |
| Handle<FieldType> LookupIterator::GetFieldType() const { |
| DCHECK(has_property_); |
| DCHECK(holder_->HasFastProperties(isolate_)); |
| DCHECK_EQ(kField, property_details_.location()); |
| return handle(holder_->map(isolate_) |
| .instance_descriptors(isolate_, kRelaxedLoad) |
| .GetFieldType(isolate_, descriptor_number()), |
| isolate_); |
| } |
| |
| Handle<PropertyCell> LookupIterator::GetPropertyCell() const { |
| DCHECK(!IsElement(*holder_)); |
| Handle<JSGlobalObject> holder = GetHolder<JSGlobalObject>(); |
| return handle( |
| holder->global_dictionary(isolate_).CellAt(isolate_, dictionary_entry()), |
| isolate_); |
| } |
| |
| Handle<Object> LookupIterator::GetAccessors() const { |
| DCHECK_EQ(ACCESSOR, state_); |
| return FetchValue(); |
| } |
| |
| Handle<Object> LookupIterator::GetDataValue( |
| AllocationPolicy allocation_policy) const { |
| DCHECK_EQ(DATA, state_); |
| Handle<Object> value = FetchValue(allocation_policy); |
| return value; |
| } |
| |
| void LookupIterator::WriteDataValue(Handle<Object> value, |
| bool initializing_store) { |
| DCHECK_EQ(DATA, state_); |
| Handle<JSReceiver> holder = GetHolder<JSReceiver>(); |
| if (IsElement(*holder)) { |
| Handle<JSObject> object = Handle<JSObject>::cast(holder); |
| ElementsAccessor* accessor = object->GetElementsAccessor(isolate_); |
| accessor->Set(object, number_, *value); |
| } else if (holder->HasFastProperties(isolate_)) { |
| if (property_details_.location() == kField) { |
| // Check that in case of VariableMode::kConst field the existing value is |
| // equal to |value|. |
| DCHECK_IMPLIES(!initializing_store && property_details_.constness() == |
| PropertyConstness::kConst, |
| IsConstFieldValueEqualTo(*value)); |
| JSObject::cast(*holder).WriteToField(descriptor_number(), |
| property_details_, *value); |
| } else { |
| DCHECK_EQ(kDescriptor, property_details_.location()); |
| DCHECK_EQ(PropertyConstness::kConst, property_details_.constness()); |
| } |
| } else if (holder->IsJSGlobalObject(isolate_)) { |
| GlobalDictionary dictionary = |
| JSGlobalObject::cast(*holder).global_dictionary(isolate_); |
| dictionary.CellAt(isolate_, dictionary_entry()).set_value(*value); |
| } else { |
| DCHECK_IMPLIES(holder->IsJSProxy(isolate_), name()->IsPrivate(isolate_)); |
| if (V8_DICT_MODE_PROTOTYPES_BOOL) { |
| OrderedNameDictionary dictionary = |
| holder->property_dictionary_ordered(isolate_); |
| dictionary.ValueAtPut(dictionary_entry(), *value); |
| } else { |
| NameDictionary dictionary = holder->property_dictionary(isolate_); |
| dictionary.ValueAtPut(dictionary_entry(), *value); |
| } |
| } |
| } |
| |
| template <bool is_element> |
| bool LookupIterator::SkipInterceptor(JSObject holder) { |
| InterceptorInfo info = GetInterceptor<is_element>(holder); |
| if (!is_element && name_->IsSymbol(isolate_) && |
| !info.can_intercept_symbols()) { |
| return true; |
| } |
| if (info.non_masking()) { |
| switch (interceptor_state_) { |
| case InterceptorState::kUninitialized: |
| interceptor_state_ = InterceptorState::kSkipNonMasking; |
| V8_FALLTHROUGH; |
| case InterceptorState::kSkipNonMasking: |
| return true; |
| case InterceptorState::kProcessNonMasking: |
| return false; |
| } |
| } |
| return interceptor_state_ == InterceptorState::kProcessNonMasking; |
| } |
| |
| JSReceiver LookupIterator::NextHolder(Map map) { |
| DisallowHeapAllocation no_gc; |
| if (map.prototype(isolate_) == ReadOnlyRoots(isolate_).null_value()) { |
| return JSReceiver(); |
| } |
| if (!check_prototype_chain() && !map.IsJSGlobalProxyMap()) { |
| return JSReceiver(); |
| } |
| return JSReceiver::cast(map.prototype(isolate_)); |
| } |
| |
| LookupIterator::State LookupIterator::NotFound(JSReceiver const holder) const { |
| if (!holder.IsJSTypedArray(isolate_)) return NOT_FOUND; |
| if (IsElement()) return INTEGER_INDEXED_EXOTIC; |
| if (!name_->IsString(isolate_)) return NOT_FOUND; |
| return IsSpecialIndex(String::cast(*name_)) ? INTEGER_INDEXED_EXOTIC |
| : NOT_FOUND; |
| } |
| |
| namespace { |
| |
| template <bool is_element> |
| bool HasInterceptor(Map map, size_t index) { |
| if (is_element) { |
| if (index > JSArray::kMaxArrayIndex) { |
| // There is currently no way to install interceptors on an object with |
| // typed array elements. |
| DCHECK(!map.has_typed_array_elements()); |
| return map.has_named_interceptor(); |
| } |
| return map.has_indexed_interceptor(); |
| } else { |
| return map.has_named_interceptor(); |
| } |
| } |
| |
| } // namespace |
| |
| template <bool is_element> |
| LookupIterator::State LookupIterator::LookupInSpecialHolder( |
| Map const map, JSReceiver const holder) { |
| STATIC_ASSERT(INTERCEPTOR == BEFORE_PROPERTY); |
| switch (state_) { |
| case NOT_FOUND: |
| if (map.IsJSProxyMap()) { |
| if (is_element || !name_->IsPrivate(isolate_)) return JSPROXY; |
| } |
| if (map.is_access_check_needed()) { |
| if (is_element || !name_->IsPrivate(isolate_)) return ACCESS_CHECK; |
| } |
| V8_FALLTHROUGH; |
| case ACCESS_CHECK: |
| if (check_interceptor() && HasInterceptor<is_element>(map, index_) && |
| !SkipInterceptor<is_element>(JSObject::cast(holder))) { |
| if (is_element || !name_->IsPrivate(isolate_)) return INTERCEPTOR; |
| } |
| V8_FALLTHROUGH; |
| case INTERCEPTOR: |
| if (map.IsJSGlobalObjectMap() && !is_js_array_element(is_element)) { |
| GlobalDictionary dict = |
| JSGlobalObject::cast(holder).global_dictionary(isolate_); |
| number_ = dict.FindEntry(isolate(), name_); |
| if (number_.is_not_found()) return NOT_FOUND; |
| PropertyCell cell = dict.CellAt(isolate_, number_); |
| if (cell.value(isolate_).IsTheHole(isolate_)) return NOT_FOUND; |
| property_details_ = cell.property_details(); |
| has_property_ = true; |
| switch (property_details_.kind()) { |
| case v8::internal::kData: |
| return DATA; |
| case v8::internal::kAccessor: |
| return ACCESSOR; |
| } |
| } |
| return LookupInRegularHolder<is_element>(map, holder); |
| case ACCESSOR: |
| case DATA: |
| return NOT_FOUND; |
| case INTEGER_INDEXED_EXOTIC: |
| case JSPROXY: |
| case TRANSITION: |
| UNREACHABLE(); |
| } |
| UNREACHABLE(); |
| } |
| |
| template <bool is_element> |
| LookupIterator::State LookupIterator::LookupInRegularHolder( |
| Map const map, JSReceiver const holder) { |
| DisallowHeapAllocation no_gc; |
| if (interceptor_state_ == InterceptorState::kProcessNonMasking) { |
| return NOT_FOUND; |
| } |
| |
| if (is_element && IsElement(holder)) { |
| JSObject js_object = JSObject::cast(holder); |
| ElementsAccessor* accessor = js_object.GetElementsAccessor(isolate_); |
| FixedArrayBase backing_store = js_object.elements(isolate_); |
| number_ = |
| accessor->GetEntryForIndex(isolate_, js_object, backing_store, index_); |
| if (number_.is_not_found()) { |
| return holder.IsJSTypedArray(isolate_) ? INTEGER_INDEXED_EXOTIC |
| : NOT_FOUND; |
| } |
| property_details_ = accessor->GetDetails(js_object, number_); |
| if (map.has_frozen_elements()) { |
| property_details_ = property_details_.CopyAddAttributes(FROZEN); |
| } else if (map.has_sealed_elements()) { |
| property_details_ = property_details_.CopyAddAttributes(SEALED); |
| } |
| } else if (!map.is_dictionary_map()) { |
| DescriptorArray descriptors = |
| map.instance_descriptors(isolate_, kRelaxedLoad); |
| number_ = descriptors.SearchWithCache(isolate_, *name_, map); |
| if (number_.is_not_found()) return NotFound(holder); |
| property_details_ = descriptors.GetDetails(number_); |
| } else { |
| DCHECK_IMPLIES(holder.IsJSProxy(isolate_), name()->IsPrivate(isolate_)); |
| if (V8_DICT_MODE_PROTOTYPES_BOOL) { |
| OrderedNameDictionary dict = holder.property_dictionary_ordered(isolate_); |
| number_ = dict.FindEntry(isolate(), *name_); |
| if (number_.is_not_found()) return NotFound(holder); |
| property_details_ = dict.DetailsAt(number_); |
| } else { |
| NameDictionary dict = holder.property_dictionary(isolate_); |
| number_ = dict.FindEntry(isolate(), name_); |
| if (number_.is_not_found()) return NotFound(holder); |
| property_details_ = dict.DetailsAt(number_); |
| } |
| } |
| has_property_ = true; |
| switch (property_details_.kind()) { |
| case v8::internal::kData: |
| return DATA; |
| case v8::internal::kAccessor: |
| return ACCESSOR; |
| } |
| |
| UNREACHABLE(); |
| } |
| |
| Handle<InterceptorInfo> LookupIterator::GetInterceptorForFailedAccessCheck() |
| const { |
| DCHECK_EQ(ACCESS_CHECK, state_); |
| DisallowHeapAllocation no_gc; |
| AccessCheckInfo access_check_info = |
| AccessCheckInfo::Get(isolate_, Handle<JSObject>::cast(holder_)); |
| if (!access_check_info.is_null()) { |
| // There is currently no way to create objects with typed array elements |
| // and access checks. |
| DCHECK(!holder_->map().has_typed_array_elements()); |
| Object interceptor = is_js_array_element(IsElement()) |
| ? access_check_info.indexed_interceptor() |
| : access_check_info.named_interceptor(); |
| if (interceptor != Object()) { |
| return handle(InterceptorInfo::cast(interceptor), isolate_); |
| } |
| } |
| return Handle<InterceptorInfo>(); |
| } |
| |
| bool LookupIterator::TryLookupCachedProperty() { |
| return state() == LookupIterator::ACCESSOR && |
| GetAccessors()->IsAccessorPair(isolate_) && LookupCachedProperty(); |
| } |
| |
| bool LookupIterator::LookupCachedProperty() { |
| DCHECK_EQ(state(), LookupIterator::ACCESSOR); |
| DCHECK(GetAccessors()->IsAccessorPair(isolate_)); |
| |
| AccessorPair accessor_pair = AccessorPair::cast(*GetAccessors()); |
| Handle<Object> getter(accessor_pair.getter(isolate_), isolate()); |
| MaybeHandle<Name> maybe_name = |
| FunctionTemplateInfo::TryGetCachedPropertyName(isolate(), getter); |
| if (maybe_name.is_null()) return false; |
| |
| // We have found a cached property! Modify the iterator accordingly. |
| name_ = maybe_name.ToHandleChecked(); |
| Restart(); |
| CHECK_EQ(state(), LookupIterator::DATA); |
| return true; |
| } |
| |
| } // namespace internal |
| } // namespace v8 |
