| // 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 <stdlib.h> |
| |
| #include <limits> |
| |
| #include "src/builtins/accessors.h" |
| #include "src/common/globals.h" |
| #include "src/common/message-template.h" |
| #include "src/execution/arguments-inl.h" |
| #include "src/execution/isolate-inl.h" |
| #include "src/logging/log.h" |
| #include "src/objects/hash-table-inl.h" |
| #include "src/objects/literal-objects-inl.h" |
| #include "src/objects/lookup-inl.h" |
| #include "src/objects/smi.h" |
| #include "src/runtime/runtime.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| RUNTIME_FUNCTION(Runtime_ThrowUnsupportedSuperError) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(0, args.length()); |
| THROW_NEW_ERROR_RETURN_FAILURE( |
| isolate, NewReferenceError(MessageTemplate::kUnsupportedSuper)); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_ThrowConstructorNonCallableError) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(1, args.length()); |
| Handle<JSFunction> constructor = args.at<JSFunction>(0); |
| Handle<String> name(constructor->shared().Name(), isolate); |
| |
| Handle<Context> context = handle(constructor->native_context(), isolate); |
| DCHECK(context->IsNativeContext()); |
| Handle<JSFunction> realm_type_error_function( |
| JSFunction::cast(context->get(Context::TYPE_ERROR_FUNCTION_INDEX)), |
| isolate); |
| if (name->length() == 0) { |
| THROW_NEW_ERROR_RETURN_FAILURE( |
| isolate, NewError(realm_type_error_function, |
| MessageTemplate::kAnonymousConstructorNonCallable)); |
| } |
| THROW_NEW_ERROR_RETURN_FAILURE( |
| isolate, NewError(realm_type_error_function, |
| MessageTemplate::kConstructorNonCallable, name)); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_ThrowStaticPrototypeError) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(0, args.length()); |
| THROW_NEW_ERROR_RETURN_FAILURE( |
| isolate, NewTypeError(MessageTemplate::kStaticPrototype)); |
| } |
| |
| RUNTIME_FUNCTION(Runtime_ThrowSuperAlreadyCalledError) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(0, args.length()); |
| THROW_NEW_ERROR_RETURN_FAILURE( |
| isolate, NewReferenceError(MessageTemplate::kSuperAlreadyCalled)); |
| } |
| |
| RUNTIME_FUNCTION(Runtime_ThrowSuperNotCalled) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(0, args.length()); |
| THROW_NEW_ERROR_RETURN_FAILURE( |
| isolate, NewReferenceError(MessageTemplate::kSuperNotCalled)); |
| } |
| |
| namespace { |
| |
| Object ThrowNotSuperConstructor(Isolate* isolate, Handle<Object> constructor, |
| Handle<JSFunction> function) { |
| Handle<String> super_name; |
| if (constructor->IsJSFunction()) { |
| super_name = |
| handle(Handle<JSFunction>::cast(constructor)->shared().Name(), isolate); |
| } else if (constructor->IsOddball()) { |
| DCHECK(constructor->IsNull(isolate)); |
| super_name = isolate->factory()->null_string(); |
| } else { |
| super_name = Object::NoSideEffectsToString(isolate, constructor); |
| } |
| // null constructor |
| if (super_name->length() == 0) { |
| super_name = isolate->factory()->null_string(); |
| } |
| Handle<String> function_name(function->shared().Name(), isolate); |
| // anonymous class |
| if (function_name->length() == 0) { |
| THROW_NEW_ERROR_RETURN_FAILURE( |
| isolate, |
| NewTypeError(MessageTemplate::kNotSuperConstructorAnonymousClass, |
| super_name)); |
| } |
| THROW_NEW_ERROR_RETURN_FAILURE( |
| isolate, NewTypeError(MessageTemplate::kNotSuperConstructor, super_name, |
| function_name)); |
| } |
| |
| } // namespace |
| |
| RUNTIME_FUNCTION(Runtime_ThrowNotSuperConstructor) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(2, args.length()); |
| Handle<Object> constructor = args.at(0); |
| Handle<JSFunction> function = args.at<JSFunction>(1); |
| return ThrowNotSuperConstructor(isolate, constructor, function); |
| } |
| |
| namespace { |
| |
| template <typename Dictionary> |
| Handle<Name> KeyToName(Isolate* isolate, Handle<Object> key) { |
| static_assert((std::is_same<Dictionary, SwissNameDictionary>::value || |
| std::is_same<Dictionary, NameDictionary>::value)); |
| DCHECK(key->IsName()); |
| return Handle<Name>::cast(key); |
| } |
| |
| template <> |
| Handle<Name> KeyToName<NumberDictionary>(Isolate* isolate, Handle<Object> key) { |
| DCHECK(key->IsNumber()); |
| return isolate->factory()->NumberToString(key); |
| } |
| |
| // Gets |index|'th argument which may be a class constructor object, a class |
| // prototype object or a class method. In the latter case the following |
| // post-processing may be required: |
| // 1) set method's name to a concatenation of |name_prefix| and |key| if the |
| // method's shared function info indicates that method does not have a |
| // shared name. |
| template <typename Dictionary> |
| MaybeHandle<Object> GetMethodAndSetName(Isolate* isolate, |
| RuntimeArguments& args, Smi index, |
| Handle<String> name_prefix, |
| Handle<Object> key) { |
| int int_index = index.value(); |
| |
| // Class constructor and prototype values do not require post processing. |
| if (int_index < ClassBoilerplate::kFirstDynamicArgumentIndex) { |
| return args.at<Object>(int_index); |
| } |
| |
| Handle<JSFunction> method = args.at<JSFunction>(int_index); |
| |
| if (!method->shared().HasSharedName()) { |
| // TODO(ishell): method does not have a shared name at this point only if |
| // the key is a computed property name. However, the bytecode generator |
| // explicitly generates ToName bytecodes to ensure that the computed |
| // property name is properly converted to Name. So, we can actually be smart |
| // here and avoid converting Smi keys back to Name. |
| Handle<Name> name = KeyToName<Dictionary>(isolate, key); |
| if (!JSFunction::SetName(method, name, name_prefix)) { |
| return MaybeHandle<Object>(); |
| } |
| } |
| return method; |
| } |
| |
| // Gets |index|'th argument which may be a class constructor object, a class |
| // prototype object or a class method. |
| // This is a simplified version of GetMethodAndSetName() |
| // function above that is used when it's guaranteed that the method has |
| // shared name. |
| Object GetMethodWithSharedName(Isolate* isolate, RuntimeArguments& args, |
| Object index) { |
| DisallowGarbageCollection no_gc; |
| int int_index = Smi::ToInt(index); |
| |
| // Class constructor and prototype values do not require post processing. |
| if (int_index < ClassBoilerplate::kFirstDynamicArgumentIndex) { |
| return args[int_index]; |
| } |
| |
| Handle<JSFunction> method = args.at<JSFunction>(int_index); |
| DCHECK(method->shared().HasSharedName()); |
| return *method; |
| } |
| |
| template <typename Dictionary> |
| Handle<Dictionary> ShallowCopyDictionaryTemplate( |
| Isolate* isolate, Handle<Dictionary> dictionary_template) { |
| Handle<Dictionary> dictionary = |
| Dictionary::ShallowCopy(isolate, dictionary_template); |
| // Clone all AccessorPairs in the dictionary. |
| for (InternalIndex i : dictionary->IterateEntries()) { |
| Object value = dictionary->ValueAt(i); |
| if (value.IsAccessorPair()) { |
| Handle<AccessorPair> pair(AccessorPair::cast(value), isolate); |
| pair = AccessorPair::Copy(isolate, pair); |
| dictionary->ValueAtPut(i, *pair); |
| } |
| } |
| return dictionary; |
| } |
| |
| template <typename Dictionary> |
| bool SubstituteValues(Isolate* isolate, Handle<Dictionary> dictionary, |
| RuntimeArguments& args) { |
| // Replace all indices with proper methods. |
| ReadOnlyRoots roots(isolate); |
| for (InternalIndex i : dictionary->IterateEntries()) { |
| Object maybe_key = dictionary->KeyAt(i); |
| if (!Dictionary::IsKey(roots, maybe_key)) continue; |
| Handle<Object> key(maybe_key, isolate); |
| Handle<Object> value(dictionary->ValueAt(i), isolate); |
| if (value->IsAccessorPair()) { |
| Handle<AccessorPair> pair = Handle<AccessorPair>::cast(value); |
| Object tmp = pair->getter(); |
| if (tmp.IsSmi()) { |
| Handle<Object> result; |
| ASSIGN_RETURN_ON_EXCEPTION_VALUE( |
| isolate, result, |
| GetMethodAndSetName<Dictionary>(isolate, args, Smi::cast(tmp), |
| isolate->factory()->get_string(), |
| key), |
| false); |
| pair->set_getter(*result); |
| } |
| tmp = pair->setter(); |
| if (tmp.IsSmi()) { |
| Handle<Object> result; |
| ASSIGN_RETURN_ON_EXCEPTION_VALUE( |
| isolate, result, |
| GetMethodAndSetName<Dictionary>(isolate, args, Smi::cast(tmp), |
| isolate->factory()->set_string(), |
| key), |
| false); |
| pair->set_setter(*result); |
| } |
| } else if (value->IsSmi()) { |
| Handle<Object> result; |
| ASSIGN_RETURN_ON_EXCEPTION_VALUE( |
| isolate, result, |
| GetMethodAndSetName<Dictionary>(isolate, args, Smi::cast(*value), |
| isolate->factory()->empty_string(), |
| key), |
| false); |
| dictionary->ValueAtPut(i, *result); |
| } |
| } |
| return true; |
| } |
| |
| template <typename Dictionary> |
| void UpdateProtectors(Isolate* isolate, Handle<JSObject> receiver, |
| Handle<Dictionary> properties_dictionary) { |
| ReadOnlyRoots roots(isolate); |
| for (InternalIndex i : properties_dictionary->IterateEntries()) { |
| Object maybe_key = properties_dictionary->KeyAt(i); |
| if (!Dictionary::IsKey(roots, maybe_key)) continue; |
| Handle<Name> name(Name::cast(maybe_key), isolate); |
| LookupIterator::UpdateProtector(isolate, receiver, name); |
| } |
| } |
| |
| void UpdateProtectors(Isolate* isolate, Handle<JSObject> receiver, |
| Handle<DescriptorArray> properties_template) { |
| int nof_descriptors = properties_template->number_of_descriptors(); |
| for (InternalIndex i : InternalIndex::Range(nof_descriptors)) { |
| Handle<Name> name(properties_template->GetKey(i), isolate); |
| LookupIterator::UpdateProtector(isolate, receiver, name); |
| } |
| } |
| |
| bool AddDescriptorsByTemplate( |
| Isolate* isolate, Handle<Map> map, |
| Handle<DescriptorArray> descriptors_template, |
| Handle<NumberDictionary> elements_dictionary_template, |
| Handle<JSObject> receiver, RuntimeArguments& args) { |
| int nof_descriptors = descriptors_template->number_of_descriptors(); |
| |
| Handle<DescriptorArray> descriptors = |
| DescriptorArray::Allocate(isolate, nof_descriptors, 0); |
| |
| Handle<NumberDictionary> elements_dictionary = |
| *elements_dictionary_template == |
| ReadOnlyRoots(isolate).empty_slow_element_dictionary() |
| ? elements_dictionary_template |
| : ShallowCopyDictionaryTemplate(isolate, |
| elements_dictionary_template); |
| |
| // Count the number of properties that must be in the instance and |
| // create the property array to hold the constants. |
| int count = 0; |
| for (InternalIndex i : InternalIndex::Range(nof_descriptors)) { |
| PropertyDetails details = descriptors_template->GetDetails(i); |
| if (details.location() == PropertyLocation::kDescriptor && |
| details.kind() == PropertyKind::kData) { |
| count++; |
| } |
| } |
| Handle<PropertyArray> property_array = |
| isolate->factory()->NewPropertyArray(count); |
| |
| // Read values from |descriptors_template| and store possibly post-processed |
| // values into "instantiated" |descriptors| array. |
| int field_index = 0; |
| for (InternalIndex i : InternalIndex::Range(nof_descriptors)) { |
| Object value = descriptors_template->GetStrongValue(i); |
| if (value.IsAccessorPair()) { |
| Handle<AccessorPair> pair = AccessorPair::Copy( |
| isolate, handle(AccessorPair::cast(value), isolate)); |
| value = *pair; |
| } |
| DisallowGarbageCollection no_gc; |
| Name name = descriptors_template->GetKey(i); |
| DCHECK(name.IsUniqueName()); |
| PropertyDetails details = descriptors_template->GetDetails(i); |
| if (details.location() == PropertyLocation::kDescriptor) { |
| if (details.kind() == PropertyKind::kData) { |
| if (value.IsSmi()) { |
| value = GetMethodWithSharedName(isolate, args, value); |
| } |
| details = details.CopyWithRepresentation( |
| value.OptimalRepresentation(isolate)); |
| } else { |
| DCHECK_EQ(PropertyKind::kAccessor, details.kind()); |
| if (value.IsAccessorPair()) { |
| AccessorPair pair = AccessorPair::cast(value); |
| Object tmp = pair.getter(); |
| if (tmp.IsSmi()) { |
| pair.set_getter(GetMethodWithSharedName(isolate, args, tmp)); |
| } |
| tmp = pair.setter(); |
| if (tmp.IsSmi()) { |
| pair.set_setter(GetMethodWithSharedName(isolate, args, tmp)); |
| } |
| } |
| } |
| } else { |
| UNREACHABLE(); |
| } |
| DCHECK(value.FitsRepresentation(details.representation())); |
| if (details.location() == PropertyLocation::kDescriptor && |
| details.kind() == PropertyKind::kData) { |
| details = |
| PropertyDetails(details.kind(), details.attributes(), |
| PropertyLocation::kField, PropertyConstness::kConst, |
| details.representation(), field_index) |
| .set_pointer(details.pointer()); |
| |
| property_array->set(field_index, value); |
| field_index++; |
| descriptors->Set(i, name, MaybeObject::FromObject(FieldType::Any()), |
| details); |
| } else { |
| descriptors->Set(i, name, MaybeObject::FromObject(value), details); |
| } |
| } |
| |
| UpdateProtectors(isolate, receiver, descriptors_template); |
| |
| map->InitializeDescriptors(isolate, *descriptors); |
| if (elements_dictionary->NumberOfElements() > 0) { |
| if (!SubstituteValues<NumberDictionary>(isolate, elements_dictionary, |
| args)) { |
| return false; |
| } |
| map->set_elements_kind(DICTIONARY_ELEMENTS); |
| } |
| |
| // Atomically commit the changes. |
| receiver->set_map(*map, kReleaseStore); |
| if (elements_dictionary->NumberOfElements() > 0) { |
| receiver->set_elements(*elements_dictionary); |
| } |
| if (property_array->length() > 0) { |
| receiver->SetProperties(*property_array); |
| } |
| return true; |
| } |
| |
| // TODO(v8:7569): This is a workaround for the Handle vs MaybeHandle difference |
| // in the return types of the different Add functions: |
| // OrderedNameDictionary::Add returns MaybeHandle, NameDictionary::Add returns |
| // Handle. |
| template <typename T> |
| Handle<T> ToHandle(Handle<T> h) { |
| return h; |
| } |
| template <typename T> |
| Handle<T> ToHandle(MaybeHandle<T> h) { |
| return h.ToHandleChecked(); |
| } |
| |
| template <typename Dictionary> |
| bool AddDescriptorsByTemplate( |
| Isolate* isolate, Handle<Map> map, |
| Handle<Dictionary> properties_dictionary_template, |
| Handle<NumberDictionary> elements_dictionary_template, |
| Handle<FixedArray> computed_properties, Handle<JSObject> receiver, |
| RuntimeArguments& args) { |
| int computed_properties_length = computed_properties->length(); |
| |
| // Shallow-copy properties template. |
| Handle<Dictionary> properties_dictionary = |
| ShallowCopyDictionaryTemplate(isolate, properties_dictionary_template); |
| Handle<NumberDictionary> elements_dictionary = |
| ShallowCopyDictionaryTemplate(isolate, elements_dictionary_template); |
| |
| using ValueKind = ClassBoilerplate::ValueKind; |
| using ComputedEntryFlags = ClassBoilerplate::ComputedEntryFlags; |
| |
| // Merge computed properties with properties and elements dictionary |
| // templates. |
| int i = 0; |
| while (i < computed_properties_length) { |
| int flags = Smi::ToInt(computed_properties->get(i++)); |
| |
| ValueKind value_kind = ComputedEntryFlags::ValueKindBits::decode(flags); |
| int key_index = ComputedEntryFlags::KeyIndexBits::decode(flags); |
| Smi value = Smi::FromInt(key_index + 1); // Value follows name. |
| |
| Handle<Object> key = args.at(key_index); |
| DCHECK(key->IsName()); |
| uint32_t element; |
| Handle<Name> name = Handle<Name>::cast(key); |
| if (name->AsArrayIndex(&element)) { |
| ClassBoilerplate::AddToElementsTemplate( |
| isolate, elements_dictionary, element, key_index, value_kind, value); |
| |
| } else { |
| name = isolate->factory()->InternalizeName(name); |
| ClassBoilerplate::AddToPropertiesTemplate( |
| isolate, properties_dictionary, name, key_index, value_kind, value); |
| if (name->IsInteresting(isolate)) { |
| // TODO(pthier): Add flags to swiss dictionaries. |
| if constexpr (!V8_ENABLE_SWISS_NAME_DICTIONARY_BOOL) { |
| properties_dictionary->set_may_have_interesting_properties(true); |
| } |
| } |
| } |
| } |
| |
| // Replace all indices with proper methods. |
| if (!SubstituteValues<Dictionary>(isolate, properties_dictionary, args)) { |
| return false; |
| } |
| |
| UpdateProtectors(isolate, receiver, properties_dictionary); |
| |
| if (elements_dictionary->NumberOfElements() > 0) { |
| if (!SubstituteValues<NumberDictionary>(isolate, elements_dictionary, |
| args)) { |
| return false; |
| } |
| map->set_elements_kind(DICTIONARY_ELEMENTS); |
| } |
| |
| // Atomically commit the changes. |
| receiver->set_map(*map, kReleaseStore); |
| receiver->set_raw_properties_or_hash(*properties_dictionary, kRelaxedStore); |
| if (elements_dictionary->NumberOfElements() > 0) { |
| receiver->set_elements(*elements_dictionary); |
| } |
| return true; |
| } |
| |
| Handle<JSObject> CreateClassPrototype(Isolate* isolate) { |
| // For constant tracking we want to avoid the hassle of handling |
| // in-object properties, so create a map with no in-object |
| // properties. |
| |
| // TODO(ishell) Support caching of zero in-object properties map |
| // by ObjectLiteralMapFromCache(). |
| Handle<Map> map = Map::Create(isolate, 0); |
| return isolate->factory()->NewJSObjectFromMap(map); |
| } |
| |
| bool InitClassPrototype(Isolate* isolate, |
| Handle<ClassBoilerplate> class_boilerplate, |
| Handle<JSObject> prototype, |
| Handle<HeapObject> prototype_parent, |
| Handle<JSFunction> constructor, |
| RuntimeArguments& args) { |
| Handle<Map> map(prototype->map(), isolate); |
| map = Map::CopyDropDescriptors(isolate, map); |
| map->set_is_prototype_map(true); |
| Map::SetPrototype(isolate, map, prototype_parent); |
| constructor->set_prototype_or_initial_map(*prototype, kReleaseStore); |
| map->SetConstructor(*constructor); |
| Handle<FixedArray> computed_properties( |
| class_boilerplate->instance_computed_properties(), isolate); |
| Handle<NumberDictionary> elements_dictionary_template( |
| NumberDictionary::cast(class_boilerplate->instance_elements_template()), |
| isolate); |
| |
| Handle<Object> properties_template( |
| class_boilerplate->instance_properties_template(), isolate); |
| |
| if (properties_template->IsDescriptorArray()) { |
| Handle<DescriptorArray> descriptors_template = |
| Handle<DescriptorArray>::cast(properties_template); |
| |
| // The size of the prototype object is known at this point. |
| // So we can create it now and then add the rest instance methods to the |
| // map. |
| return AddDescriptorsByTemplate(isolate, map, descriptors_template, |
| elements_dictionary_template, prototype, |
| args); |
| } else { |
| map->set_is_dictionary_map(true); |
| map->set_is_migration_target(false); |
| map->set_may_have_interesting_properties(true); |
| map->set_construction_counter(Map::kNoSlackTracking); |
| |
| if constexpr (V8_ENABLE_SWISS_NAME_DICTIONARY_BOOL) { |
| Handle<SwissNameDictionary> properties_dictionary_template = |
| Handle<SwissNameDictionary>::cast(properties_template); |
| return AddDescriptorsByTemplate( |
| isolate, map, properties_dictionary_template, |
| elements_dictionary_template, computed_properties, prototype, args); |
| } else { |
| Handle<NameDictionary> properties_dictionary_template = |
| Handle<NameDictionary>::cast(properties_template); |
| return AddDescriptorsByTemplate( |
| isolate, map, properties_dictionary_template, |
| elements_dictionary_template, computed_properties, prototype, args); |
| } |
| } |
| } |
| |
| bool InitClassConstructor(Isolate* isolate, |
| Handle<ClassBoilerplate> class_boilerplate, |
| Handle<HeapObject> constructor_parent, |
| Handle<JSFunction> constructor, |
| RuntimeArguments& args) { |
| Handle<Map> map(constructor->map(), isolate); |
| map = Map::CopyDropDescriptors(isolate, map); |
| DCHECK(map->is_prototype_map()); |
| |
| if (!constructor_parent.is_null()) { |
| // Set map's prototype without enabling prototype setup mode for superclass |
| // because it does not make sense. |
| Map::SetPrototype(isolate, map, constructor_parent, false); |
| // Ensure that setup mode will never be enabled for superclass. |
| JSObject::MakePrototypesFast(constructor_parent, kStartAtReceiver, isolate); |
| } |
| |
| Handle<NumberDictionary> elements_dictionary_template( |
| NumberDictionary::cast(class_boilerplate->static_elements_template()), |
| isolate); |
| Handle<FixedArray> computed_properties( |
| class_boilerplate->static_computed_properties(), isolate); |
| |
| Handle<Object> properties_template( |
| class_boilerplate->static_properties_template(), isolate); |
| |
| if (properties_template->IsDescriptorArray()) { |
| Handle<DescriptorArray> descriptors_template = |
| Handle<DescriptorArray>::cast(properties_template); |
| |
| return AddDescriptorsByTemplate(isolate, map, descriptors_template, |
| elements_dictionary_template, constructor, |
| args); |
| } else { |
| map->set_is_dictionary_map(true); |
| map->InitializeDescriptors(isolate, |
| ReadOnlyRoots(isolate).empty_descriptor_array()); |
| map->set_is_migration_target(false); |
| map->set_may_have_interesting_properties(true); |
| map->set_construction_counter(Map::kNoSlackTracking); |
| |
| if constexpr (V8_ENABLE_SWISS_NAME_DICTIONARY_BOOL) { |
| Handle<SwissNameDictionary> properties_dictionary_template = |
| Handle<SwissNameDictionary>::cast(properties_template); |
| |
| return AddDescriptorsByTemplate( |
| isolate, map, properties_dictionary_template, |
| elements_dictionary_template, computed_properties, constructor, args); |
| } else { |
| Handle<NameDictionary> properties_dictionary_template = |
| Handle<NameDictionary>::cast(properties_template); |
| return AddDescriptorsByTemplate( |
| isolate, map, properties_dictionary_template, |
| elements_dictionary_template, computed_properties, constructor, args); |
| } |
| } |
| } |
| |
| MaybeHandle<Object> DefineClass(Isolate* isolate, |
| Handle<ClassBoilerplate> class_boilerplate, |
| Handle<Object> super_class, |
| Handle<JSFunction> constructor, |
| RuntimeArguments& args) { |
| Handle<Object> prototype_parent; |
| Handle<HeapObject> constructor_parent; |
| |
| if (super_class->IsTheHole(isolate)) { |
| prototype_parent = isolate->initial_object_prototype(); |
| } else { |
| if (super_class->IsNull(isolate)) { |
| prototype_parent = isolate->factory()->null_value(); |
| } else if (super_class->IsConstructor()) { |
| DCHECK(!super_class->IsJSFunction() || |
| !IsResumableFunction( |
| Handle<JSFunction>::cast(super_class)->shared().kind())); |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, prototype_parent, |
| Runtime::GetObjectProperty(isolate, super_class, |
| isolate->factory()->prototype_string()), |
| Object); |
| if (!prototype_parent->IsNull(isolate) && |
| !prototype_parent->IsJSReceiver()) { |
| THROW_NEW_ERROR( |
| isolate, NewTypeError(MessageTemplate::kPrototypeParentNotAnObject, |
| prototype_parent), |
| Object); |
| } |
| // Create new handle to avoid |constructor_parent| corruption because of |
| // |super_class| handle value overwriting via storing to |
| // args[ClassBoilerplate::kPrototypeArgumentIndex] below. |
| constructor_parent = handle(HeapObject::cast(*super_class), isolate); |
| } else { |
| THROW_NEW_ERROR(isolate, |
| NewTypeError(MessageTemplate::kExtendsValueNotConstructor, |
| super_class), |
| Object); |
| } |
| } |
| |
| Handle<JSObject> prototype = CreateClassPrototype(isolate); |
| DCHECK_EQ(*constructor, args[ClassBoilerplate::kConstructorArgumentIndex]); |
| // Temporarily change ClassBoilerplate::kPrototypeArgumentIndex for the |
| // subsequent calls, but use a scope to make sure to change it back before |
| // returning, to not corrupt the caller's argument frame (in particular, for |
| // the interpreter, to not clobber the register frame). |
| RuntimeArguments::ChangeValueScope set_prototype_value_scope( |
| isolate, &args, ClassBoilerplate::kPrototypeArgumentIndex, *prototype); |
| |
| if (!InitClassConstructor(isolate, class_boilerplate, constructor_parent, |
| constructor, args) || |
| !InitClassPrototype(isolate, class_boilerplate, prototype, |
| Handle<HeapObject>::cast(prototype_parent), |
| constructor, args)) { |
| DCHECK(isolate->has_pending_exception()); |
| return MaybeHandle<Object>(); |
| } |
| if (v8_flags.log_maps) { |
| Handle<Map> empty_map; |
| LOG(isolate, |
| MapEvent("InitialMap", empty_map, handle(constructor->map(), isolate), |
| "init class constructor", |
| SharedFunctionInfo::DebugName( |
| isolate, handle(constructor->shared(), isolate)))); |
| LOG(isolate, |
| MapEvent("InitialMap", empty_map, handle(prototype->map(), isolate), |
| "init class prototype")); |
| } |
| |
| return prototype; |
| } |
| |
| } // namespace |
| |
| RUNTIME_FUNCTION(Runtime_DefineClass) { |
| HandleScope scope(isolate); |
| DCHECK_LE(ClassBoilerplate::kFirstDynamicArgumentIndex, args.length()); |
| Handle<ClassBoilerplate> class_boilerplate = args.at<ClassBoilerplate>(0); |
| Handle<JSFunction> constructor = args.at<JSFunction>(1); |
| Handle<Object> super_class = args.at(2); |
| DCHECK_EQ(class_boilerplate->arguments_count(), args.length()); |
| |
| RETURN_RESULT_OR_FAILURE( |
| isolate, |
| DefineClass(isolate, class_boilerplate, super_class, constructor, args)); |
| } |
| |
| namespace { |
| |
| enum class SuperMode { kLoad, kStore }; |
| |
| MaybeHandle<JSReceiver> GetSuperHolder(Isolate* isolate, |
| Handle<JSObject> home_object, |
| SuperMode mode, PropertyKey* key) { |
| if (home_object->IsAccessCheckNeeded() && |
| !isolate->MayAccess(handle(isolate->context(), isolate), home_object)) { |
| isolate->ReportFailedAccessCheck(home_object); |
| RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, JSReceiver); |
| } |
| |
| PrototypeIterator iter(isolate, home_object); |
| Handle<Object> proto = PrototypeIterator::GetCurrent(iter); |
| if (!proto->IsJSReceiver()) { |
| MessageTemplate message = |
| mode == SuperMode::kLoad |
| ? MessageTemplate::kNonObjectPropertyLoadWithProperty |
| : MessageTemplate::kNonObjectPropertyStoreWithProperty; |
| Handle<Name> name = key->GetName(isolate); |
| THROW_NEW_ERROR(isolate, NewTypeError(message, proto, name), JSReceiver); |
| } |
| return Handle<JSReceiver>::cast(proto); |
| } |
| |
| MaybeHandle<Object> LoadFromSuper(Isolate* isolate, Handle<Object> receiver, |
| Handle<JSObject> home_object, |
| PropertyKey* key) { |
| Handle<JSReceiver> holder; |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, holder, |
| GetSuperHolder(isolate, home_object, SuperMode::kLoad, key), Object); |
| LookupIterator it(isolate, receiver, *key, holder); |
| Handle<Object> result; |
| ASSIGN_RETURN_ON_EXCEPTION(isolate, result, Object::GetProperty(&it), Object); |
| return result; |
| } |
| |
| } // anonymous namespace |
| |
| RUNTIME_FUNCTION(Runtime_LoadFromSuper) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(3, args.length()); |
| Handle<Object> receiver = args.at(0); |
| Handle<JSObject> home_object = args.at<JSObject>(1); |
| Handle<Name> name = args.at<Name>(2); |
| |
| PropertyKey key(isolate, name); |
| |
| RETURN_RESULT_OR_FAILURE(isolate, |
| LoadFromSuper(isolate, receiver, home_object, &key)); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_LoadKeyedFromSuper) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(3, args.length()); |
| Handle<Object> receiver = args.at(0); |
| Handle<JSObject> home_object = args.at<JSObject>(1); |
| // TODO(ishell): To improve performance, consider performing the to-string |
| // conversion of {key} before calling into the runtime. |
| Handle<Object> key = args.at(2); |
| |
| bool success; |
| PropertyKey lookup_key(isolate, key, &success); |
| if (!success) return ReadOnlyRoots(isolate).exception(); |
| |
| RETURN_RESULT_OR_FAILURE( |
| isolate, LoadFromSuper(isolate, receiver, home_object, &lookup_key)); |
| } |
| |
| namespace { |
| |
| MaybeHandle<Object> StoreToSuper(Isolate* isolate, Handle<JSObject> home_object, |
| Handle<Object> receiver, PropertyKey* key, |
| Handle<Object> value, |
| StoreOrigin store_origin) { |
| Handle<JSReceiver> holder; |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, holder, |
| GetSuperHolder(isolate, home_object, SuperMode::kStore, key), Object); |
| LookupIterator it(isolate, receiver, *key, holder); |
| MAYBE_RETURN(Object::SetSuperProperty(&it, value, store_origin), |
| MaybeHandle<Object>()); |
| return value; |
| } |
| |
| } // anonymous namespace |
| |
| RUNTIME_FUNCTION(Runtime_StoreToSuper) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(4, args.length()); |
| Handle<Object> receiver = args.at(0); |
| Handle<JSObject> home_object = args.at<JSObject>(1); |
| Handle<Name> name = args.at<Name>(2); |
| Handle<Object> value = args.at(3); |
| |
| PropertyKey key(isolate, name); |
| |
| RETURN_RESULT_OR_FAILURE( |
| isolate, StoreToSuper(isolate, home_object, receiver, &key, value, |
| StoreOrigin::kNamed)); |
| } |
| |
| RUNTIME_FUNCTION(Runtime_StoreKeyedToSuper) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(4, args.length()); |
| Handle<Object> receiver = args.at(0); |
| Handle<JSObject> home_object = args.at<JSObject>(1); |
| // TODO(ishell): To improve performance, consider performing the to-string |
| // conversion of {key} before calling into the runtime. |
| Handle<Object> key = args.at(2); |
| Handle<Object> value = args.at(3); |
| |
| bool success; |
| PropertyKey lookup_key(isolate, key, &success); |
| if (!success) return ReadOnlyRoots(isolate).exception(); |
| |
| RETURN_RESULT_OR_FAILURE( |
| isolate, StoreToSuper(isolate, home_object, receiver, &lookup_key, value, |
| StoreOrigin::kMaybeKeyed)); |
| } |
| |
| } // namespace internal |
| } // namespace v8 |
