// Copyright 2017 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/builtins/builtins-utils-gen.h" #include "src/builtins/builtins.h" #include "src/code-stub-assembler.h" #include "src/factory-inl.h" #include "src/objects/shared-function-info.h" namespace v8 { namespace internal { // ----------------------------------------------------------------------------- // ES6 section 19.1 Object Objects typedef compiler::Node Node; class ObjectBuiltinsAssembler : public CodeStubAssembler { public: explicit ObjectBuiltinsAssembler(compiler::CodeAssemblerState* state) : CodeStubAssembler(state) {} protected: void ReturnToStringFormat(Node* context, Node* string); }; void ObjectBuiltinsAssembler::ReturnToStringFormat(Node* context, Node* string) { Node* lhs = StringConstant("[object "); Node* rhs = StringConstant("]"); Callable callable = CodeFactory::StringAdd(isolate(), STRING_ADD_CHECK_NONE, NOT_TENURED); Return(CallStub(callable, context, CallStub(callable, context, lhs, string), rhs)); } TF_BUILTIN(ObjectPrototypeHasOwnProperty, ObjectBuiltinsAssembler) { Node* object = Parameter(Descriptor::kReceiver); Node* key = Parameter(Descriptor::kKey); Node* context = Parameter(Descriptor::kContext); Label call_runtime(this), return_true(this), return_false(this), to_primitive(this); // Smi receivers do not have own properties, just perform ToPrimitive on the // key. Label if_objectisnotsmi(this); Branch(TaggedIsSmi(object), &to_primitive, &if_objectisnotsmi); BIND(&if_objectisnotsmi); Node* map = LoadMap(object); Node* instance_type = LoadMapInstanceType(map); { VARIABLE(var_index, MachineType::PointerRepresentation()); VARIABLE(var_unique, MachineRepresentation::kTagged); Label if_index(this), if_unique_name(this), if_notunique_name(this); TryToName(key, &if_index, &var_index, &if_unique_name, &var_unique, &call_runtime, &if_notunique_name); BIND(&if_unique_name); TryHasOwnProperty(object, map, instance_type, var_unique.value(), &return_true, &return_false, &call_runtime); BIND(&if_index); { // Handle negative keys in the runtime. GotoIf(IntPtrLessThan(var_index.value(), IntPtrConstant(0)), &call_runtime); TryLookupElement(object, map, instance_type, var_index.value(), &return_true, &return_false, &return_false, &call_runtime); } BIND(&if_notunique_name); { Label not_in_string_table(this); TryInternalizeString(key, &if_index, &var_index, &if_unique_name, &var_unique, ¬_in_string_table, &call_runtime); BIND(¬_in_string_table); { // If the string was not found in the string table, then no regular // object can have a property with that name, so return |false|. // "Special API objects" with interceptors must take the slow path. Branch(IsSpecialReceiverInstanceType(instance_type), &call_runtime, &return_false); } } } BIND(&to_primitive); GotoIf(IsNumber(key), &return_false); Branch(IsName(key), &return_false, &call_runtime); BIND(&return_true); Return(BooleanConstant(true)); BIND(&return_false); Return(BooleanConstant(false)); BIND(&call_runtime); Return(CallRuntime(Runtime::kObjectHasOwnProperty, context, object, key)); } // ES #sec-object.keys TF_BUILTIN(ObjectKeys, ObjectBuiltinsAssembler) { Node* object = Parameter(Descriptor::kObject); Node* context = Parameter(Descriptor::kContext); VARIABLE(var_length, MachineRepresentation::kTagged); VARIABLE(var_elements, MachineRepresentation::kTagged); Label if_empty(this, Label::kDeferred), if_empty_elements(this), if_fast(this), if_slow(this, Label::kDeferred), if_join(this); // Check if the {object} has a usable enum cache. GotoIf(TaggedIsSmi(object), &if_slow); Node* object_map = LoadMap(object); Node* object_bit_field3 = LoadMapBitField3(object_map); Node* object_enum_length = DecodeWordFromWord32<Map::EnumLengthBits>(object_bit_field3); GotoIf( WordEqual(object_enum_length, IntPtrConstant(kInvalidEnumCacheSentinel)), &if_slow); // Ensure that the {object} doesn't have any elements. CSA_ASSERT(this, IsJSObjectMap(object_map)); Node* object_elements = LoadObjectField(object, JSObject::kElementsOffset); GotoIf(IsEmptyFixedArray(object_elements), &if_empty_elements); Branch(IsEmptySlowElementDictionary(object_elements), &if_empty_elements, &if_slow); // Check whether there are enumerable properties. BIND(&if_empty_elements); Branch(WordEqual(object_enum_length, IntPtrConstant(0)), &if_empty, &if_fast); BIND(&if_fast); { // The {object} has a usable enum cache, use that. Node* object_descriptors = LoadMapDescriptors(object_map); Node* object_enum_cache = LoadObjectField(object_descriptors, DescriptorArray::kEnumCacheOffset); Node* object_enum_keys = LoadObjectField(object_enum_cache, EnumCache::kKeysOffset); // Allocate a JSArray and copy the elements from the {object_enum_keys}. Node* array = nullptr; Node* elements = nullptr; Node* native_context = LoadNativeContext(context); Node* array_map = LoadJSArrayElementsMap(PACKED_ELEMENTS, native_context); Node* array_length = SmiTag(object_enum_length); std::tie(array, elements) = AllocateUninitializedJSArrayWithElements( PACKED_ELEMENTS, array_map, array_length, nullptr, object_enum_length, INTPTR_PARAMETERS); CopyFixedArrayElements(PACKED_ELEMENTS, object_enum_keys, elements, object_enum_length, SKIP_WRITE_BARRIER); Return(array); } BIND(&if_empty); { // The {object} doesn't have any enumerable keys. var_length.Bind(SmiConstant(0)); var_elements.Bind(EmptyFixedArrayConstant()); Goto(&if_join); } BIND(&if_slow); { // Let the runtime compute the elements. Node* elements = CallRuntime(Runtime::kObjectKeys, context, object); var_length.Bind(LoadObjectField(elements, FixedArray::kLengthOffset)); var_elements.Bind(elements); Goto(&if_join); } BIND(&if_join); { // Wrap the elements into a proper JSArray and return that. Node* native_context = LoadNativeContext(context); Node* array_map = LoadJSArrayElementsMap(PACKED_ELEMENTS, native_context); Node* array = AllocateUninitializedJSArrayWithoutElements( PACKED_ELEMENTS, array_map, var_length.value(), nullptr); StoreObjectFieldNoWriteBarrier(array, JSArray::kElementsOffset, var_elements.value()); Return(array); } } // ES #sec-object.prototype.isprototypeof TF_BUILTIN(ObjectPrototypeIsPrototypeOf, ObjectBuiltinsAssembler) { Node* receiver = Parameter(Descriptor::kReceiver); Node* value = Parameter(Descriptor::kValue); Node* context = Parameter(Descriptor::kContext); Label if_receiverisnullorundefined(this, Label::kDeferred), if_valueisnotreceiver(this, Label::kDeferred); // We only check whether {value} is a Smi here, so that the // prototype chain walk below can safely access the {value}s // map. We don't rule out Primitive {value}s, since all of // them have null as their prototype, so the chain walk below // immediately aborts and returns false anyways. GotoIf(TaggedIsSmi(value), &if_valueisnotreceiver); // Check if {receiver} is either null or undefined and in that case, // invoke the ToObject builtin, which raises the appropriate error. // Otherwise we don't need to invoke ToObject, since {receiver} is // either already a JSReceiver, in which case ToObject is a no-op, // or it's a Primitive and ToObject would allocate a fresh JSValue // wrapper, which wouldn't be identical to any existing JSReceiver // found in the prototype chain of {value}, hence it will return // false no matter if we search for the Primitive {receiver} or // a newly allocated JSValue wrapper for {receiver}. GotoIf(IsNull(receiver), &if_receiverisnullorundefined); GotoIf(IsUndefined(receiver), &if_receiverisnullorundefined); // Loop through the prototype chain looking for the {receiver}. Return(HasInPrototypeChain(context, value, receiver)); BIND(&if_receiverisnullorundefined); { // If {value} is a primitive HeapObject, we need to return // false instead of throwing an exception per order of the // steps in the specification, so check that first here. GotoIfNot(IsJSReceiver(value), &if_valueisnotreceiver); // Simulate the ToObject invocation on {receiver}. CallBuiltin(Builtins::kToObject, context, receiver); Unreachable(); } BIND(&if_valueisnotreceiver); Return(FalseConstant()); } // ES #sec-object.prototype.tostring TF_BUILTIN(ObjectPrototypeToString, ObjectBuiltinsAssembler) { Label checkstringtag(this), if_apiobject(this, Label::kDeferred), if_arguments(this), if_array(this), if_boolean(this), if_date(this), if_error(this), if_function(this), if_number(this, Label::kDeferred), if_object(this), if_primitive(this), if_proxy(this, Label::kDeferred), if_regexp(this), if_string(this), if_symbol(this, Label::kDeferred), if_value(this); Node* receiver = Parameter(Descriptor::kReceiver); Node* context = Parameter(Descriptor::kContext); // This is arranged to check the likely cases first. VARIABLE(var_default, MachineRepresentation::kTagged); VARIABLE(var_holder, MachineRepresentation::kTagged, receiver); GotoIf(TaggedIsSmi(receiver), &if_number); Node* receiver_map = LoadMap(receiver); Node* receiver_instance_type = LoadMapInstanceType(receiver_map); GotoIf(IsPrimitiveInstanceType(receiver_instance_type), &if_primitive); const struct { InstanceType value; Label* label; } kJumpTable[] = {{JS_OBJECT_TYPE, &if_object}, {JS_ARRAY_TYPE, &if_array}, {JS_FUNCTION_TYPE, &if_function}, {JS_REGEXP_TYPE, &if_regexp}, {JS_ARGUMENTS_TYPE, &if_arguments}, {JS_DATE_TYPE, &if_date}, {JS_BOUND_FUNCTION_TYPE, &if_function}, {JS_API_OBJECT_TYPE, &if_apiobject}, {JS_SPECIAL_API_OBJECT_TYPE, &if_apiobject}, {JS_PROXY_TYPE, &if_proxy}, {JS_ERROR_TYPE, &if_error}, {JS_VALUE_TYPE, &if_value}}; size_t const kNumCases = arraysize(kJumpTable); Label* case_labels[kNumCases]; int32_t case_values[kNumCases]; for (size_t i = 0; i < kNumCases; ++i) { case_labels[i] = kJumpTable[i].label; case_values[i] = kJumpTable[i].value; } Switch(receiver_instance_type, &if_object, case_values, case_labels, arraysize(case_values)); BIND(&if_apiobject); { // Lookup the @@toStringTag property on the {receiver}. VARIABLE(var_tag, MachineRepresentation::kTagged, GetProperty(context, receiver, isolate()->factory()->to_string_tag_symbol())); Label if_tagisnotstring(this), if_tagisstring(this); GotoIf(TaggedIsSmi(var_tag.value()), &if_tagisnotstring); Branch(IsString(var_tag.value()), &if_tagisstring, &if_tagisnotstring); BIND(&if_tagisnotstring); { var_tag.Bind( CallStub(Builtins::CallableFor(isolate(), Builtins::kClassOf), context, receiver)); Goto(&if_tagisstring); } BIND(&if_tagisstring); ReturnToStringFormat(context, var_tag.value()); } BIND(&if_arguments); { var_default.Bind(LoadRoot(Heap::karguments_to_stringRootIndex)); Goto(&checkstringtag); } BIND(&if_array); { var_default.Bind(LoadRoot(Heap::karray_to_stringRootIndex)); Goto(&checkstringtag); } BIND(&if_boolean); { Node* native_context = LoadNativeContext(context); Node* boolean_constructor = LoadContextElement(native_context, Context::BOOLEAN_FUNCTION_INDEX); Node* boolean_initial_map = LoadObjectField( boolean_constructor, JSFunction::kPrototypeOrInitialMapOffset); Node* boolean_prototype = LoadObjectField(boolean_initial_map, Map::kPrototypeOffset); var_default.Bind(LoadRoot(Heap::kboolean_to_stringRootIndex)); var_holder.Bind(boolean_prototype); Goto(&checkstringtag); } BIND(&if_date); { var_default.Bind(LoadRoot(Heap::kdate_to_stringRootIndex)); Goto(&checkstringtag); } BIND(&if_error); { var_default.Bind(LoadRoot(Heap::kerror_to_stringRootIndex)); Goto(&checkstringtag); } BIND(&if_function); { var_default.Bind(LoadRoot(Heap::kfunction_to_stringRootIndex)); Goto(&checkstringtag); } BIND(&if_number); { Node* native_context = LoadNativeContext(context); Node* number_constructor = LoadContextElement(native_context, Context::NUMBER_FUNCTION_INDEX); Node* number_initial_map = LoadObjectField( number_constructor, JSFunction::kPrototypeOrInitialMapOffset); Node* number_prototype = LoadObjectField(number_initial_map, Map::kPrototypeOffset); var_default.Bind(LoadRoot(Heap::knumber_to_stringRootIndex)); var_holder.Bind(number_prototype); Goto(&checkstringtag); } BIND(&if_object); { CSA_ASSERT(this, IsJSReceiver(receiver)); var_default.Bind(LoadRoot(Heap::kobject_to_stringRootIndex)); Goto(&checkstringtag); } BIND(&if_primitive); { Label return_null(this), return_undefined(this); GotoIf(IsStringInstanceType(receiver_instance_type), &if_string); GotoIf(IsBooleanMap(receiver_map), &if_boolean); GotoIf(IsHeapNumberMap(receiver_map), &if_number); GotoIf(IsSymbolMap(receiver_map), &if_symbol); Branch(IsUndefined(receiver), &return_undefined, &return_null); BIND(&return_undefined); Return(LoadRoot(Heap::kundefined_to_stringRootIndex)); BIND(&return_null); Return(LoadRoot(Heap::knull_to_stringRootIndex)); } BIND(&if_proxy); { // If {receiver} is a proxy for a JSArray, we default to "[object Array]", // otherwise we default to "[object Object]" or "[object Function]" here, // depending on whether the {receiver} is callable. The order matters here, // i.e. we need to execute the %ArrayIsArray check before the [[Get]] below, // as the exception is observable. Node* receiver_is_array = CallRuntime(Runtime::kArrayIsArray, context, receiver); Node* builtin_tag = SelectTaggedConstant<Object>( IsTrue(receiver_is_array), LoadRoot(Heap::kArray_stringRootIndex), SelectTaggedConstant<Object>(IsCallableMap(receiver_map), LoadRoot(Heap::kFunction_stringRootIndex), LoadRoot(Heap::kObject_stringRootIndex))); // Lookup the @@toStringTag property on the {receiver}. VARIABLE(var_tag, MachineRepresentation::kTagged, GetProperty(context, receiver, isolate()->factory()->to_string_tag_symbol())); Label if_tagisnotstring(this), if_tagisstring(this); GotoIf(TaggedIsSmi(var_tag.value()), &if_tagisnotstring); Branch(IsString(var_tag.value()), &if_tagisstring, &if_tagisnotstring); BIND(&if_tagisnotstring); { var_tag.Bind(builtin_tag); Goto(&if_tagisstring); } BIND(&if_tagisstring); ReturnToStringFormat(context, var_tag.value()); } BIND(&if_regexp); { var_default.Bind(LoadRoot(Heap::kregexp_to_stringRootIndex)); Goto(&checkstringtag); } BIND(&if_string); { Node* native_context = LoadNativeContext(context); Node* string_constructor = LoadContextElement(native_context, Context::STRING_FUNCTION_INDEX); Node* string_initial_map = LoadObjectField( string_constructor, JSFunction::kPrototypeOrInitialMapOffset); Node* string_prototype = LoadObjectField(string_initial_map, Map::kPrototypeOffset); var_default.Bind(LoadRoot(Heap::kstring_to_stringRootIndex)); var_holder.Bind(string_prototype); Goto(&checkstringtag); } BIND(&if_symbol); { Node* native_context = LoadNativeContext(context); Node* symbol_constructor = LoadContextElement(native_context, Context::SYMBOL_FUNCTION_INDEX); Node* symbol_initial_map = LoadObjectField( symbol_constructor, JSFunction::kPrototypeOrInitialMapOffset); Node* symbol_prototype = LoadObjectField(symbol_initial_map, Map::kPrototypeOffset); var_default.Bind(LoadRoot(Heap::kobject_to_stringRootIndex)); var_holder.Bind(symbol_prototype); Goto(&checkstringtag); } BIND(&if_value); { Node* receiver_value = LoadJSValueValue(receiver); GotoIf(TaggedIsSmi(receiver_value), &if_number); Node* receiver_value_map = LoadMap(receiver_value); GotoIf(IsHeapNumberMap(receiver_value_map), &if_number); GotoIf(IsBooleanMap(receiver_value_map), &if_boolean); Branch(IsSymbolMap(receiver_value_map), &if_symbol, &if_string); } BIND(&checkstringtag); { // Check if all relevant maps (including the prototype maps) don't // have any interesting symbols (i.e. that none of them have the // @@toStringTag property). Label loop(this, &var_holder), return_default(this), return_generic(this, Label::kDeferred); Goto(&loop); BIND(&loop); { Node* holder = var_holder.value(); GotoIf(IsNull(holder), &return_default); Node* holder_map = LoadMap(holder); Node* holder_bit_field3 = LoadMapBitField3(holder_map); GotoIf(IsSetWord32<Map::MayHaveInterestingSymbols>(holder_bit_field3), &return_generic); var_holder.Bind(LoadMapPrototype(holder_map)); Goto(&loop); } BIND(&return_generic); { Node* tag = GetProperty( context, CallBuiltin(Builtins::kToObject, context, receiver), LoadRoot(Heap::kto_string_tag_symbolRootIndex)); GotoIf(TaggedIsSmi(tag), &return_default); GotoIfNot(IsString(tag), &return_default); ReturnToStringFormat(context, tag); } BIND(&return_default); Return(var_default.value()); } } // ES6 #sec-object.prototype.valueof TF_BUILTIN(ObjectPrototypeValueOf, CodeStubAssembler) { Node* receiver = Parameter(Descriptor::kReceiver); Node* context = Parameter(Descriptor::kContext); Return(CallBuiltin(Builtins::kToObject, context, receiver)); } // ES #sec-object.create TF_BUILTIN(ObjectCreate, ObjectBuiltinsAssembler) { int const kPrototypeArg = 0; int const kPropertiesArg = 1; Node* argc = ChangeInt32ToIntPtr(Parameter(BuiltinDescriptor::kArgumentsCount)); CodeStubArguments args(this, argc); Node* prototype = args.GetOptionalArgumentValue(kPrototypeArg); Node* properties = args.GetOptionalArgumentValue(kPropertiesArg); Node* context = Parameter(BuiltinDescriptor::kContext); Label call_runtime(this, Label::kDeferred), prototype_valid(this), no_properties(this); { Comment("Argument 1 check: prototype"); GotoIf(WordEqual(prototype, NullConstant()), &prototype_valid); BranchIfJSReceiver(prototype, &prototype_valid, &call_runtime); } BIND(&prototype_valid); { Comment("Argument 2 check: properties"); // Check that we have a simple object GotoIf(TaggedIsSmi(properties), &call_runtime); // Undefined implies no properties. GotoIf(WordEqual(properties, UndefinedConstant()), &no_properties); Node* properties_map = LoadMap(properties); GotoIf(IsSpecialReceiverMap(properties_map), &call_runtime); // Stay on the fast path only if there are no elements. GotoIfNot(WordEqual(LoadElements(properties), LoadRoot(Heap::kEmptyFixedArrayRootIndex)), &call_runtime); // Handle dictionary objects or fast objects with properties in runtime. Node* bit_field3 = LoadMapBitField3(properties_map); GotoIf(IsSetWord32<Map::DictionaryMap>(bit_field3), &call_runtime); Branch(IsSetWord32<Map::NumberOfOwnDescriptorsBits>(bit_field3), &call_runtime, &no_properties); } // Create a new object with the given prototype. BIND(&no_properties); { VARIABLE(map, MachineRepresentation::kTagged); VARIABLE(properties, MachineRepresentation::kTagged); Label non_null_proto(this), instantiate_map(this), good(this); Branch(WordEqual(prototype, NullConstant()), &good, &non_null_proto); BIND(&good); { map.Bind(LoadContextElement( context, Context::SLOW_OBJECT_WITH_NULL_PROTOTYPE_MAP)); properties.Bind(AllocateNameDictionary(NameDictionary::kInitialCapacity)); Goto(&instantiate_map); } BIND(&non_null_proto); { properties.Bind(EmptyFixedArrayConstant()); Node* object_function = LoadContextElement(context, Context::OBJECT_FUNCTION_INDEX); Node* object_function_map = LoadObjectField( object_function, JSFunction::kPrototypeOrInitialMapOffset); map.Bind(object_function_map); GotoIf(WordEqual(prototype, LoadMapPrototype(map.value())), &instantiate_map); // Try loading the prototype info. Node* prototype_info = LoadMapPrototypeInfo(LoadMap(prototype), &call_runtime); Comment("Load ObjectCreateMap from PrototypeInfo"); Node* weak_cell = LoadObjectField(prototype_info, PrototypeInfo::kObjectCreateMap); GotoIf(WordEqual(weak_cell, UndefinedConstant()), &call_runtime); map.Bind(LoadWeakCellValue(weak_cell, &call_runtime)); Goto(&instantiate_map); } BIND(&instantiate_map); { Node* instance = AllocateJSObjectFromMap(map.value(), properties.value()); args.PopAndReturn(instance); } } BIND(&call_runtime); { Node* result = CallRuntime(Runtime::kObjectCreate, context, prototype, properties); args.PopAndReturn(result); } } TF_BUILTIN(CreateIterResultObject, ObjectBuiltinsAssembler) { Node* const value = Parameter(Descriptor::kValue); Node* const done = Parameter(Descriptor::kDone); Node* const context = Parameter(Descriptor::kContext); Node* const native_context = LoadNativeContext(context); Node* const map = LoadContextElement(native_context, Context::ITERATOR_RESULT_MAP_INDEX); Node* const result = AllocateJSObjectFromMap(map); StoreObjectFieldNoWriteBarrier(result, JSIteratorResult::kValueOffset, value); StoreObjectFieldNoWriteBarrier(result, JSIteratorResult::kDoneOffset, done); Return(result); } TF_BUILTIN(HasProperty, ObjectBuiltinsAssembler) { Node* key = Parameter(Descriptor::kKey); Node* object = Parameter(Descriptor::kObject); Node* context = Parameter(Descriptor::kContext); Return(HasProperty(object, key, context, kHasProperty)); } TF_BUILTIN(InstanceOf, ObjectBuiltinsAssembler) { Node* object = Parameter(Descriptor::kLeft); Node* callable = Parameter(Descriptor::kRight); Node* context = Parameter(Descriptor::kContext); Return(InstanceOf(object, callable, context)); } // ES6 section 7.3.19 OrdinaryHasInstance ( C, O ) TF_BUILTIN(OrdinaryHasInstance, ObjectBuiltinsAssembler) { Node* constructor = Parameter(Descriptor::kLeft); Node* object = Parameter(Descriptor::kRight); Node* context = Parameter(Descriptor::kContext); Return(OrdinaryHasInstance(context, constructor, object)); } TF_BUILTIN(GetSuperConstructor, ObjectBuiltinsAssembler) { Node* object = Parameter(Descriptor::kObject); Node* context = Parameter(Descriptor::kContext); Return(GetSuperConstructor(object, context)); } TF_BUILTIN(CreateGeneratorObject, ObjectBuiltinsAssembler) { Node* closure = Parameter(Descriptor::kClosure); Node* receiver = Parameter(Descriptor::kReceiver); Node* context = Parameter(Descriptor::kContext); // Get the initial map from the function, jumping to the runtime if we don't // have one. Node* maybe_map = LoadObjectField(closure, JSFunction::kPrototypeOrInitialMapOffset); Label runtime(this); GotoIf(DoesntHaveInstanceType(maybe_map, MAP_TYPE), &runtime); Node* shared = LoadObjectField(closure, JSFunction::kSharedFunctionInfoOffset); Node* bytecode_array = LoadObjectField(shared, SharedFunctionInfo::kFunctionDataOffset); Node* frame_size = ChangeInt32ToIntPtr(LoadObjectField( bytecode_array, BytecodeArray::kFrameSizeOffset, MachineType::Int32())); Node* size = WordSar(frame_size, IntPtrConstant(kPointerSizeLog2)); Node* register_file = AllocateFixedArray(HOLEY_ELEMENTS, size); FillFixedArrayWithValue(HOLEY_ELEMENTS, register_file, IntPtrConstant(0), size, Heap::kUndefinedValueRootIndex); Node* const result = AllocateJSObjectFromMap(maybe_map); StoreObjectFieldNoWriteBarrier(result, JSGeneratorObject::kFunctionOffset, closure); StoreObjectFieldNoWriteBarrier(result, JSGeneratorObject::kContextOffset, context); StoreObjectFieldNoWriteBarrier(result, JSGeneratorObject::kReceiverOffset, receiver); StoreObjectFieldNoWriteBarrier(result, JSGeneratorObject::kRegisterFileOffset, register_file); Node* executing = SmiConstant(JSGeneratorObject::kGeneratorExecuting); StoreObjectFieldNoWriteBarrier(result, JSGeneratorObject::kContinuationOffset, executing); HandleSlackTracking(context, result, maybe_map, JSGeneratorObject::kSize); Return(result); BIND(&runtime); { Return(CallRuntime(Runtime::kCreateJSGeneratorObject, context, closure, receiver)); } } } // namespace internal } // namespace v8