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cobalt / cobalt / 7a8c3d464b6008023471eebab34df4c241e6d713 / . / src / v8 / src / runtime / runtime-object.cc
blob: 25bd07b53524b4d62f8196a4d8413619a78e9e0a [file] [log] [blame]
// 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/common/message-template.h"
#include "src/debug/debug.h"
#include "src/execution/arguments-inl.h"
#include "src/execution/isolate-inl.h"
#include "src/heap/heap-inl.h" // For ToBoolean. TODO(jkummerow): Drop.
#include "src/init/bootstrapper.h"
#include "src/logging/counters.h"
#include "src/objects/hash-table-inl.h"
#include "src/objects/js-array-inl.h"
#include "src/objects/property-descriptor-object.h"
#include "src/objects/property-descriptor.h"
#include "src/runtime/runtime-utils.h"
#include "src/runtime/runtime.h"
namespace v8 {
namespace internal {
MaybeHandle<Object> Runtime::GetObjectProperty(Isolate* isolate,
Handle<Object> object,
Handle<Object> key,
bool* is_found_out) {
if (object->IsNullOrUndefined(isolate)) {
if (*key == ReadOnlyRoots(isolate).iterator_symbol()) {
return Runtime::ThrowIteratorError(isolate, object);
}
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kNonObjectPropertyLoad, key, object),
Object);
}
bool success = false;
LookupIterator it =
LookupIterator::PropertyOrElement(isolate, object, key, &success);
if (!success) return MaybeHandle<Object>();
MaybeHandle<Object> result = Object::GetProperty(&it);
if (is_found_out) *is_found_out = it.IsFound();
if (!it.IsFound() && key->IsSymbol() &&
Symbol::cast(*key).is_private_name()) {
Handle<Object> name_string(Symbol::cast(*key).name(), isolate);
DCHECK(name_string->IsString());
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kInvalidPrivateFieldRead,
name_string, object),
Object);
}
return result;
}
MaybeHandle<Object> Runtime::HasProperty(Isolate* isolate,
Handle<Object> object,
Handle<Object> key) {
// Check that {object} is actually a receiver.
if (!object->IsJSReceiver()) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kInvalidInOperatorUse, key, object),
Object);
}
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(object);
// Convert the {key} to a name.
Handle<Name> name;
ASSIGN_RETURN_ON_EXCEPTION(isolate, name, Object::ToName(isolate, key),
Object);
// Lookup the {name} on {receiver}.
Maybe<bool> maybe = JSReceiver::HasProperty(receiver, name);
if (maybe.IsNothing()) return MaybeHandle<Object>();
return maybe.FromJust() ? ReadOnlyRoots(isolate).true_value_handle()
: ReadOnlyRoots(isolate).false_value_handle();
}
namespace {
bool DeleteObjectPropertyFast(Isolate* isolate, Handle<JSReceiver> receiver,
Handle<Object> raw_key) {
// This implements a special case for fast property deletion: when the
// last property in an object is deleted, then instead of normalizing
// the properties, we can undo the last map transition, with a few
// prerequisites:
// (1) The receiver must be a regular object and the key a unique name.
Handle<Map> receiver_map(receiver->map(), isolate);
if (receiver_map->IsSpecialReceiverMap()) return false;
if (!raw_key->IsUniqueName()) return false;
Handle<Name> key = Handle<Name>::cast(raw_key);
// (2) The property to be deleted must be the last property.
int nof = receiver_map->NumberOfOwnDescriptors();
if (nof == 0) return false;
int descriptor = nof - 1;
Handle<DescriptorArray> descriptors(receiver_map->instance_descriptors(),
isolate);
if (descriptors->GetKey(descriptor) != *key) return false;
// (3) The property to be deleted must be deletable.
PropertyDetails details = descriptors->GetDetails(descriptor);
if (!details.IsConfigurable()) return false;
// (4) The map must have a back pointer.
Handle<Object> backpointer(receiver_map->GetBackPointer(), isolate);
if (!backpointer->IsMap()) return false;
Handle<Map> parent_map = Handle<Map>::cast(backpointer);
// (5) The last transition must have been caused by adding a property
// (and not any kind of special transition).
if (parent_map->NumberOfOwnDescriptors() != nof - 1) return false;
// Preconditions successful. No more bailouts after this point.
// If the {descriptor} was "const" so far, we need to update the
// {receiver_map} here, otherwise we could get the constants wrong, i.e.
//
// o.x = 1;
// delete o.x;
// o.x = 2;
//
// could trick V8 into thinking that `o.x` is still 1 even after the second
// assignment.
if (details.constness() == PropertyConstness::kConst &&
details.location() == kField) {
Handle<FieldType> field_type(descriptors->GetFieldType(descriptor),
isolate);
Map::GeneralizeField(isolate, receiver_map, descriptor,
PropertyConstness::kMutable, details.representation(),
field_type);
DCHECK_EQ(PropertyConstness::kMutable,
descriptors->GetDetails(descriptor).constness());
}
// Zap the property to avoid keeping objects alive. Zapping is not necessary
// for properties stored in the descriptor array.
if (details.location() == kField) {
DisallowHeapAllocation no_allocation;
isolate->heap()->NotifyObjectLayoutChange(
*receiver, receiver_map->instance_size(), no_allocation);
FieldIndex index =
FieldIndex::ForPropertyIndex(*receiver_map, details.field_index());
// Special case deleting the last out-of object property.
if (!index.is_inobject() && index.outobject_array_index() == 0) {
DCHECK(!parent_map->HasOutOfObjectProperties());
// Clear out the properties backing store.
receiver->SetProperties(ReadOnlyRoots(isolate).empty_fixed_array());
} else {
Object filler = ReadOnlyRoots(isolate).one_pointer_filler_map();
JSObject::cast(*receiver).RawFastPropertyAtPut(index, filler);
// We must clear any recorded slot for the deleted property, because
// subsequent object modifications might put a raw double there.
// Slot clearing is the reason why this entire function cannot currently
// be implemented in the DeleteProperty stub.
if (index.is_inobject() && !receiver_map->IsUnboxedDoubleField(index)) {
isolate->heap()->ClearRecordedSlot(*receiver,
receiver->RawField(index.offset()));
}
}
}
// If the {receiver_map} was marked stable before, then there could be
// optimized code that depends on the assumption that no object that
// reached this {receiver_map} transitions away from it without triggering
// the "deoptimize dependent code" mechanism.
receiver_map->NotifyLeafMapLayoutChange(isolate);
// Finally, perform the map rollback.
receiver->synchronized_set_map(*parent_map);
#if VERIFY_HEAP
receiver->HeapObjectVerify(isolate);
receiver->property_array().PropertyArrayVerify(isolate);
#endif
return true;
}
} // namespace
Maybe<bool> Runtime::DeleteObjectProperty(Isolate* isolate,
Handle<JSReceiver> receiver,
Handle<Object> key,
LanguageMode language_mode) {
if (DeleteObjectPropertyFast(isolate, receiver, key)) return Just(true);
bool success = false;
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, receiver, key, &success, LookupIterator::OWN);
if (!success) return Nothing<bool>();
return JSReceiver::DeleteProperty(&it, language_mode);
}
// ES #sec-object.keys
RUNTIME_FUNCTION(Runtime_ObjectKeys) {
HandleScope scope(isolate);
Handle<Object> object = args.at(0);
// Convert the {object} to a proper {receiver}.
Handle<JSReceiver> receiver;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
Object::ToObject(isolate, object));
// Collect the own keys for the {receiver}.
Handle<FixedArray> keys;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, keys,
KeyAccumulator::GetKeys(receiver, KeyCollectionMode::kOwnOnly,
ENUMERABLE_STRINGS,
GetKeysConversion::kConvertToString));
return *keys;
}
// ES #sec-object.getOwnPropertyNames
RUNTIME_FUNCTION(Runtime_ObjectGetOwnPropertyNames) {
HandleScope scope(isolate);
Handle<Object> object = args.at(0);
// Convert the {object} to a proper {receiver}.
Handle<JSReceiver> receiver;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
Object::ToObject(isolate, object));
// Collect the own keys for the {receiver}.
// TODO(v8:9401): We should extend the fast path of KeyAccumulator::GetKeys to
// also use fast path even when filter = SKIP_SYMBOLS.
Handle<FixedArray> keys;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, keys,
KeyAccumulator::GetKeys(receiver, KeyCollectionMode::kOwnOnly,
SKIP_SYMBOLS,
GetKeysConversion::kConvertToString));
return *keys;
}
RUNTIME_FUNCTION(Runtime_ObjectGetOwnPropertyNamesTryFast) {
HandleScope scope(isolate);
Handle<Object> object = args.at(0);
// Convert the {object} to a proper {receiver}.
Handle<JSReceiver> receiver;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
Object::ToObject(isolate, object));
Handle<Map> map(receiver->map(), isolate);
int nod = map->NumberOfOwnDescriptors();
Handle<FixedArray> keys;
if (nod != 0 && map->NumberOfEnumerableProperties() == nod) {
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, keys,
KeyAccumulator::GetKeys(receiver, KeyCollectionMode::kOwnOnly,
ENUMERABLE_STRINGS,
GetKeysConversion::kConvertToString));
} else {
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, keys,
KeyAccumulator::GetKeys(receiver, KeyCollectionMode::kOwnOnly,
SKIP_SYMBOLS,
GetKeysConversion::kConvertToString));
}
return *keys;
}
// ES6 19.1.3.2
RUNTIME_FUNCTION(Runtime_ObjectHasOwnProperty) {
HandleScope scope(isolate);
Handle<Object> property = args.at(1);
Handle<Name> key;
uint32_t index;
bool key_is_array_index = property->ToArrayIndex(&index);
if (!key_is_array_index) {
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, key,
Object::ToName(isolate, property));
key_is_array_index = key->AsArrayIndex(&index);
}
Handle<Object> object = args.at(0);
if (object->IsJSModuleNamespace()) {
if (key.is_null()) {
DCHECK(key_is_array_index);
// Namespace objects can't have indexed properties.
return ReadOnlyRoots(isolate).false_value();
}
Maybe<bool> result =
JSReceiver::HasOwnProperty(Handle<JSReceiver>::cast(object), key);
if (!result.IsJust()) return ReadOnlyRoots(isolate).exception();
return isolate->heap()->ToBoolean(result.FromJust());
} else if (object->IsJSObject()) {
Handle<JSObject> js_obj = Handle<JSObject>::cast(object);
// Fast case: either the key is a real named property or it is not
// an array index and there are no interceptors or hidden
// prototypes.
// TODO(jkummerow): Make JSReceiver::HasOwnProperty fast enough to
// handle all cases directly (without this custom fast path).
{
LookupIterator::Configuration c = LookupIterator::OWN_SKIP_INTERCEPTOR;
LookupIterator it =
key_is_array_index ? LookupIterator(isolate, js_obj, index, js_obj, c)
: LookupIterator(js_obj, key, js_obj, c);
Maybe<bool> maybe = JSReceiver::HasProperty(&it);
if (maybe.IsNothing()) return ReadOnlyRoots(isolate).exception();
DCHECK(!isolate->has_pending_exception());
if (maybe.FromJust()) return ReadOnlyRoots(isolate).true_value();
}
Map map = js_obj->map();
if (!map.IsJSGlobalProxyMap() &&
(key_is_array_index ? !map.has_indexed_interceptor()
: !map.has_named_interceptor())) {
return ReadOnlyRoots(isolate).false_value();
}
// Slow case.
LookupIterator::Configuration c = LookupIterator::OWN;
LookupIterator it = key_is_array_index
? LookupIterator(isolate, js_obj, index, js_obj, c)
: LookupIterator(js_obj, key, js_obj, c);
Maybe<bool> maybe = JSReceiver::HasProperty(&it);
if (maybe.IsNothing()) return ReadOnlyRoots(isolate).exception();
DCHECK(!isolate->has_pending_exception());
return isolate->heap()->ToBoolean(maybe.FromJust());
} else if (object->IsJSProxy()) {
if (key.is_null()) {
DCHECK(key_is_array_index);
key = isolate->factory()->Uint32ToString(index);
}
Maybe<bool> result =
JSReceiver::HasOwnProperty(Handle<JSProxy>::cast(object), key);
if (result.IsNothing()) return ReadOnlyRoots(isolate).exception();
return isolate->heap()->ToBoolean(result.FromJust());
} else if (object->IsString()) {
return isolate->heap()->ToBoolean(
key_is_array_index
? index < static_cast<uint32_t>(String::cast(*object).length())
: key->Equals(ReadOnlyRoots(isolate).length_string()));
} else if (object->IsNullOrUndefined(isolate)) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kUndefinedOrNullToObject));
}
return ReadOnlyRoots(isolate).false_value();
}
RUNTIME_FUNCTION(Runtime_AddDictionaryProperty) {
HandleScope scope(isolate);
Handle<JSObject> receiver = args.at<JSObject>(0);
Handle<Name> name = args.at<Name>(1);
Handle<Object> value = args.at(2);
DCHECK(name->IsUniqueName());
Handle<NameDictionary> dictionary(receiver->property_dictionary(), isolate);
PropertyDetails property_details(kData, NONE, PropertyCellType::kNoCell);
dictionary =
NameDictionary::Add(isolate, dictionary, name, value, property_details);
receiver->SetProperties(*dictionary);
return *value;
}
// ES6 section 19.1.2.2 Object.create ( O [ , Properties ] )
// TODO(verwaest): Support the common cases with precached map directly in
// an Object.create stub.
RUNTIME_FUNCTION(Runtime_ObjectCreate) {
HandleScope scope(isolate);
Handle<Object> prototype = args.at(0);
Handle<Object> properties = args.at(1);
Handle<JSObject> obj;
// 1. If Type(O) is neither Object nor Null, throw a TypeError exception.
if (!prototype->IsNull(isolate) && !prototype->IsJSReceiver()) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kProtoObjectOrNull, prototype));
}
// 2. Let obj be ObjectCreate(O).
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, obj, JSObject::ObjectCreate(isolate, prototype));
// 3. If Properties is not undefined, then
if (!properties->IsUndefined(isolate)) {
// a. Return ? ObjectDefineProperties(obj, Properties).
// Define the properties if properties was specified and is not undefined.
RETURN_RESULT_OR_FAILURE(
isolate, JSReceiver::DefineProperties(isolate, obj, properties));
}
// 4. Return obj.
return *obj;
}
MaybeHandle<Object> Runtime::SetObjectProperty(
Isolate* isolate, Handle<Object> object, Handle<Object> key,
Handle<Object> value, StoreOrigin store_origin,
Maybe<ShouldThrow> should_throw) {
if (object->IsNullOrUndefined(isolate)) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kNonObjectPropertyStore, key, object),
Object);
}
// Check if the given key is an array index.
bool success = false;
LookupIterator it =
LookupIterator::PropertyOrElement(isolate, object, key, &success);
if (!success) return MaybeHandle<Object>();
if (!it.IsFound() && key->IsSymbol() &&
Symbol::cast(*key).is_private_name()) {
Handle<Object> name_string(Symbol::cast(*key).name(), isolate);
DCHECK(name_string->IsString());
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kInvalidPrivateFieldWrite,
name_string, object),
Object);
}
MAYBE_RETURN_NULL(
Object::SetProperty(&it, value, store_origin, should_throw));
return value;
}
RUNTIME_FUNCTION(Runtime_InternalSetPrototype) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, obj, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, prototype, 1);
MAYBE_RETURN(JSReceiver::SetPrototype(obj, prototype, false, kThrowOnError),
ReadOnlyRoots(isolate).exception());
return *obj;
}
RUNTIME_FUNCTION(Runtime_OptimizeObjectForAddingMultipleProperties) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
CONVERT_SMI_ARG_CHECKED(properties, 1);
// Conservative upper limit to prevent fuzz tests from going OOM.
if (properties > 100000) return isolate->ThrowIllegalOperation();
if (object->HasFastProperties() && !object->IsJSGlobalProxy()) {
JSObject::NormalizeProperties(isolate, object, KEEP_INOBJECT_PROPERTIES,
properties, "OptimizeForAdding");
}
return *object;
}
RUNTIME_FUNCTION(Runtime_ObjectValues) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
Handle<FixedArray> values;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, values,
JSReceiver::GetOwnValues(receiver, PropertyFilter::ENUMERABLE_STRINGS,
true));
return *isolate->factory()->NewJSArrayWithElements(values);
}
RUNTIME_FUNCTION(Runtime_ObjectValuesSkipFastPath) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
Handle<FixedArray> value;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, value,
JSReceiver::GetOwnValues(receiver, PropertyFilter::ENUMERABLE_STRINGS,
false));
return *isolate->factory()->NewJSArrayWithElements(value);
}
RUNTIME_FUNCTION(Runtime_ObjectEntries) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
Handle<FixedArray> entries;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, entries,
JSReceiver::GetOwnEntries(receiver, PropertyFilter::ENUMERABLE_STRINGS,
true));
return *isolate->factory()->NewJSArrayWithElements(entries);
}
RUNTIME_FUNCTION(Runtime_ObjectEntriesSkipFastPath) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
Handle<FixedArray> entries;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, entries,
JSReceiver::GetOwnEntries(receiver, PropertyFilter::ENUMERABLE_STRINGS,
false));
return *isolate->factory()->NewJSArrayWithElements(entries);
}
RUNTIME_FUNCTION(Runtime_ObjectIsExtensible) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
Maybe<bool> result =
object->IsJSReceiver()
? JSReceiver::IsExtensible(Handle<JSReceiver>::cast(object))
: Just(false);
MAYBE_RETURN(result, ReadOnlyRoots(isolate).exception());
return isolate->heap()->ToBoolean(result.FromJust());
}
RUNTIME_FUNCTION(Runtime_JSReceiverPreventExtensionsThrow) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
MAYBE_RETURN(JSReceiver::PreventExtensions(Handle<JSReceiver>::cast(object),
kThrowOnError),
ReadOnlyRoots(isolate).exception());
return *object;
}
RUNTIME_FUNCTION(Runtime_JSReceiverPreventExtensionsDontThrow) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
Maybe<bool> result = JSReceiver::PreventExtensions(
Handle<JSReceiver>::cast(object), kDontThrow);
MAYBE_RETURN(result, ReadOnlyRoots(isolate).exception());
return *isolate->factory()->ToBoolean(result.FromJust());
}
RUNTIME_FUNCTION(Runtime_JSReceiverGetPrototypeOf) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
RETURN_RESULT_OR_FAILURE(isolate,
JSReceiver::GetPrototype(isolate, receiver));
}
RUNTIME_FUNCTION(Runtime_JSReceiverSetPrototypeOfThrow) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, proto, 1);
MAYBE_RETURN(JSReceiver::SetPrototype(object, proto, true, kThrowOnError),
ReadOnlyRoots(isolate).exception());
return *object;
}
RUNTIME_FUNCTION(Runtime_JSReceiverSetPrototypeOfDontThrow) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, proto, 1);
Maybe<bool> result =
JSReceiver::SetPrototype(object, proto, true, kDontThrow);
MAYBE_RETURN(result, ReadOnlyRoots(isolate).exception());
return *isolate->factory()->ToBoolean(result.FromJust());
}
RUNTIME_FUNCTION(Runtime_GetProperty) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, receiver_obj, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, key_obj, 1);
// Fast cases for getting named properties of the receiver JSObject
// itself.
//
// The global proxy objects has to be excluded since LookupOwn on
// the global proxy object can return a valid result even though the
// global proxy object never has properties. This is the case
// because the global proxy object forwards everything to its hidden
// prototype including own lookups.
//
// Additionally, we need to make sure that we do not cache results
// for objects that require access checks.
// Convert string-index keys to their number variant to avoid internalization
// below; and speed up subsequent conversion to index.
uint32_t index;
if (key_obj->IsString() && String::cast(*key_obj).AsArrayIndex(&index)) {
key_obj = isolate->factory()->NewNumberFromUint(index);
}
if (receiver_obj->IsJSObject()) {
if (!receiver_obj->IsJSGlobalProxy() &&
!receiver_obj->IsAccessCheckNeeded() && key_obj->IsName()) {
Handle<JSObject> receiver = Handle<JSObject>::cast(receiver_obj);
Handle<Name> key = Handle<Name>::cast(key_obj);
key_obj = key = isolate->factory()->InternalizeName(key);
DisallowHeapAllocation no_allocation;
if (receiver->IsJSGlobalObject()) {
// Attempt dictionary lookup.
GlobalDictionary dictionary =
JSGlobalObject::cast(*receiver).global_dictionary();
int entry = dictionary.FindEntry(isolate, key);
if (entry != GlobalDictionary::kNotFound) {
PropertyCell cell = dictionary.CellAt(entry);
if (cell.property_details().kind() == kData) {
Object value = cell.value();
if (!value.IsTheHole(isolate)) return value;
// If value is the hole (meaning, absent) do the general lookup.
}
}
} else if (!receiver->HasFastProperties()) {
// Attempt dictionary lookup.
NameDictionary dictionary = receiver->property_dictionary();
int entry = dictionary.FindEntry(isolate, key);
if ((entry != NameDictionary::kNotFound) &&
(dictionary.DetailsAt(entry).kind() == kData)) {
return dictionary.ValueAt(entry);
}
}
} else if (key_obj->IsSmi()) {
// JSObject without a name key. If the key is a Smi, check for a
// definite out-of-bounds access to elements, which is a strong indicator
// that subsequent accesses will also call the runtime. Proactively
// transition elements to FAST_*_ELEMENTS to avoid excessive boxing of
// doubles for those future calls in the case that the elements would
// become PACKED_DOUBLE_ELEMENTS.
Handle<JSObject> js_object = Handle<JSObject>::cast(receiver_obj);
ElementsKind elements_kind = js_object->GetElementsKind();
if (IsDoubleElementsKind(elements_kind)) {
if (Smi::ToInt(*key_obj) >= js_object->elements().length()) {
elements_kind = IsHoleyElementsKind(elements_kind) ? HOLEY_ELEMENTS
: PACKED_ELEMENTS;
JSObject::TransitionElementsKind(js_object, elements_kind);
}
} else {
DCHECK(IsSmiOrObjectElementsKind(elements_kind) ||
!IsFastElementsKind(elements_kind));
}
}
} else if (receiver_obj->IsString() && key_obj->IsSmi()) {
// Fast case for string indexing using [] with a smi index.
Handle<String> str = Handle<String>::cast(receiver_obj);
int index = Handle<Smi>::cast(key_obj)->value();
if (index >= 0 && index < str->length()) {
Factory* factory = isolate->factory();
return *factory->LookupSingleCharacterStringFromCode(
String::Flatten(isolate, str)->Get(index));
}
}
// Fall back to GetObjectProperty.
RETURN_RESULT_OR_FAILURE(
isolate, Runtime::GetObjectProperty(isolate, receiver_obj, key_obj));
}
RUNTIME_FUNCTION(Runtime_SetKeyedProperty) {
HandleScope scope(isolate);
DCHECK_EQ(3, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
RETURN_RESULT_OR_FAILURE(
isolate, Runtime::SetObjectProperty(isolate, object, key, value,
StoreOrigin::kMaybeKeyed));
}
RUNTIME_FUNCTION(Runtime_SetNamedProperty) {
HandleScope scope(isolate);
DCHECK_EQ(3, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
RETURN_RESULT_OR_FAILURE(
isolate, Runtime::SetObjectProperty(isolate, object, key, value,
StoreOrigin::kNamed));
}
// Similar to DefineDataPropertyInLiteral, but does not update feedback, and
// and does not have a flags parameter for performing SetFunctionName().
//
// Currently, this is used for ObjectLiteral spread properties.
RUNTIME_FUNCTION(Runtime_StoreDataPropertyInLiteral) {
HandleScope scope(isolate);
DCHECK_EQ(3, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
bool success;
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, object, key, &success, LookupIterator::OWN);
Maybe<bool> result = JSObject::DefineOwnPropertyIgnoreAttributes(
&it, value, NONE, Just(kDontThrow));
RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
DCHECK(result.IsJust());
USE(result);
return *value;
}
namespace {
// ES6 section 12.5.4.
Object DeleteProperty(Isolate* isolate, Handle<Object> object,
Handle<Object> key, LanguageMode language_mode) {
Handle<JSReceiver> receiver;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
Object::ToObject(isolate, object));
Maybe<bool> result =
Runtime::DeleteObjectProperty(isolate, receiver, key, language_mode);
MAYBE_RETURN(result, ReadOnlyRoots(isolate).exception());
return isolate->heap()->ToBoolean(result.FromJust());
}
} // namespace
RUNTIME_FUNCTION(Runtime_DeleteProperty) {
HandleScope scope(isolate);
DCHECK_EQ(3, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
CONVERT_SMI_ARG_CHECKED(language_mode, 2);
return DeleteProperty(isolate, object, key,
static_cast<LanguageMode>(language_mode));
}
RUNTIME_FUNCTION(Runtime_ShrinkPropertyDictionary) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
Handle<NameDictionary> dictionary(receiver->property_dictionary(), isolate);
Handle<NameDictionary> new_properties =
NameDictionary::Shrink(isolate, dictionary);
receiver->SetProperties(*new_properties);
return Smi::kZero;
}
// ES6 section 12.9.3, operator in.
RUNTIME_FUNCTION(Runtime_HasProperty) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
// Check that {object} is actually a receiver.
if (!object->IsJSReceiver()) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate,
NewTypeError(MessageTemplate::kInvalidInOperatorUse, key, object));
}
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(object);
// Convert the {key} to a name.
Handle<Name> name;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, name,
Object::ToName(isolate, key));
// Lookup the {name} on {receiver}.
Maybe<bool> maybe = JSReceiver::HasProperty(receiver, name);
if (maybe.IsNothing()) return ReadOnlyRoots(isolate).exception();
return isolate->heap()->ToBoolean(maybe.FromJust());
}
RUNTIME_FUNCTION(Runtime_GetOwnPropertyKeys) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
CONVERT_SMI_ARG_CHECKED(filter_value, 1);
PropertyFilter filter = static_cast<PropertyFilter>(filter_value);
Handle<FixedArray> keys;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, keys,
KeyAccumulator::GetKeys(object, KeyCollectionMode::kOwnOnly, filter,
GetKeysConversion::kConvertToString));
return *isolate->factory()->NewJSArrayWithElements(keys);
}
RUNTIME_FUNCTION(Runtime_ToFastProperties) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
if (object->IsJSObject() && !object->IsJSGlobalObject()) {
JSObject::MigrateSlowToFast(Handle<JSObject>::cast(object), 0,
"RuntimeToFastProperties");
}
return *object;
}
RUNTIME_FUNCTION(Runtime_AllocateHeapNumber) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
return *isolate->factory()->NewHeapNumber(0);
}
RUNTIME_FUNCTION(Runtime_NewObject) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSFunction, target, 0);
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, new_target, 1);
RETURN_RESULT_OR_FAILURE(
isolate,
JSObject::New(target, new_target, Handle<AllocationSite>::null()));
}
RUNTIME_FUNCTION(Runtime_GetDerivedMap) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSFunction, target, 0);
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, new_target, 1);
RETURN_RESULT_OR_FAILURE(
isolate, JSFunction::GetDerivedMap(isolate, target, new_target));
}
RUNTIME_FUNCTION(Runtime_CompleteInobjectSlackTrackingForMap) {
DisallowHeapAllocation no_gc;
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(Map, initial_map, 0);
initial_map->CompleteInobjectSlackTracking(isolate);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_TryMigrateInstance) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
if (!object->IsJSObject()) return Smi::kZero;
Handle<JSObject> js_object = Handle<JSObject>::cast(object);
// It could have been a DCHECK but we call this function directly from tests.
if (!js_object->map().is_deprecated()) return Smi::kZero;
// This call must not cause lazy deopts, because it's called from deferred
// code where we can't handle lazy deopts for lack of a suitable bailout
// ID. So we just try migration and signal failure if necessary,
// which will also trigger a deopt.
if (!JSObject::TryMigrateInstance(isolate, js_object)) return Smi::kZero;
return *object;
}
static bool IsValidAccessor(Isolate* isolate, Handle<Object> obj) {
return obj->IsNullOrUndefined(isolate) || obj->IsCallable();
}
// Implements part of 8.12.9 DefineOwnProperty.
// There are 3 cases that lead here:
// Step 4b - define a new accessor property.
// Steps 9c & 12 - replace an existing data property with an accessor property.
// Step 12 - update an existing accessor property with an accessor or generic
// descriptor.
RUNTIME_FUNCTION(Runtime_DefineAccessorPropertyUnchecked) {
HandleScope scope(isolate);
DCHECK_EQ(5, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
CHECK(!obj->IsNull(isolate));
CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
CONVERT_ARG_HANDLE_CHECKED(Object, getter, 2);
CHECK(IsValidAccessor(isolate, getter));
CONVERT_ARG_HANDLE_CHECKED(Object, setter, 3);
CHECK(IsValidAccessor(isolate, setter));
CONVERT_PROPERTY_ATTRIBUTES_CHECKED(attrs, 4);
RETURN_FAILURE_ON_EXCEPTION(
isolate, JSObject::DefineAccessor(obj, name, getter, setter, attrs));
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_DefineDataPropertyInLiteral) {
HandleScope scope(isolate);
DCHECK_EQ(6, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
CONVERT_SMI_ARG_CHECKED(flag, 3);
CONVERT_ARG_HANDLE_CHECKED(HeapObject, maybe_vector, 4);
CONVERT_SMI_ARG_CHECKED(index, 5);
if (!maybe_vector->IsUndefined()) {
DCHECK(maybe_vector->IsFeedbackVector());
Handle<FeedbackVector> vector = Handle<FeedbackVector>::cast(maybe_vector);
FeedbackNexus nexus(vector, FeedbackVector::ToSlot(index));
if (nexus.ic_state() == UNINITIALIZED) {
if (name->IsUniqueName()) {
nexus.ConfigureMonomorphic(name, handle(object->map(), isolate),
MaybeObjectHandle());
} else {
nexus.ConfigureMegamorphic(PROPERTY);
}
} else if (nexus.ic_state() == MONOMORPHIC) {
if (nexus.GetFirstMap() != object->map() ||
nexus.GetFeedbackExtra() != MaybeObject::FromObject(*name)) {
nexus.ConfigureMegamorphic(PROPERTY);
}
}
}
DataPropertyInLiteralFlags flags =
static_cast<DataPropertyInLiteralFlag>(flag);
PropertyAttributes attrs = (flags & DataPropertyInLiteralFlag::kDontEnum)
? PropertyAttributes::DONT_ENUM
: PropertyAttributes::NONE;
if (flags & DataPropertyInLiteralFlag::kSetFunctionName) {
DCHECK(value->IsJSFunction());
Handle<JSFunction> function = Handle<JSFunction>::cast(value);
DCHECK(!function->shared().HasSharedName());
Handle<Map> function_map(function->map(), isolate);
if (!JSFunction::SetName(function, name,
isolate->factory()->empty_string())) {
return ReadOnlyRoots(isolate).exception();
}
// Class constructors do not reserve in-object space for name field.
CHECK_IMPLIES(!IsClassConstructor(function->shared().kind()),
*function_map == function->map());
}
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, object, name, object, LookupIterator::OWN);
// Cannot fail since this should only be called when
// creating an object literal.
CHECK(JSObject::DefineOwnPropertyIgnoreAttributes(&it, value, attrs,
Just(kDontThrow))
.IsJust());
return *object;
}
RUNTIME_FUNCTION(Runtime_CollectTypeProfile) {
HandleScope scope(isolate);
DCHECK_EQ(3, args.length());
CONVERT_ARG_HANDLE_CHECKED(Smi, position, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
CONVERT_ARG_HANDLE_CHECKED(FeedbackVector, vector, 2);
Handle<String> type = Object::TypeOf(isolate, value);
if (value->IsJSReceiver()) {
Handle<JSReceiver> object = Handle<JSReceiver>::cast(value);
type = JSReceiver::GetConstructorName(object);
} else if (value->IsNull(isolate)) {
// typeof(null) is object. But it's more user-friendly to annotate
// null as type "null".
type = Handle<String>(ReadOnlyRoots(isolate).null_string(), isolate);
}
DCHECK(vector->metadata().HasTypeProfileSlot());
FeedbackNexus nexus(vector, vector->GetTypeProfileSlot());
nexus.Collect(type, position->value());
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_HasFastPackedElements) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(HeapObject, obj, 0);
return isolate->heap()->ToBoolean(
IsFastPackedElementsKind(obj.map().elements_kind()));
}
RUNTIME_FUNCTION(Runtime_IsJSReceiver) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(Object, obj, 0);
return isolate->heap()->ToBoolean(obj.IsJSReceiver());
}
RUNTIME_FUNCTION(Runtime_ClassOf) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(Object, obj, 0);
if (!obj.IsJSReceiver()) return ReadOnlyRoots(isolate).null_value();
return JSReceiver::cast(obj).class_name();
}
RUNTIME_FUNCTION(Runtime_GetFunctionName) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
return *JSFunction::GetName(isolate, function);
}
RUNTIME_FUNCTION(Runtime_DefineGetterPropertyUnchecked) {
HandleScope scope(isolate);
DCHECK_EQ(4, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
CONVERT_ARG_HANDLE_CHECKED(JSFunction, getter, 2);
CONVERT_PROPERTY_ATTRIBUTES_CHECKED(attrs, 3);
if (String::cast(getter->shared().Name()).length() == 0) {
Handle<Map> getter_map(getter->map(), isolate);
if (!JSFunction::SetName(getter, name, isolate->factory()->get_string())) {
return ReadOnlyRoots(isolate).exception();
}
CHECK_EQ(*getter_map, getter->map());
}
RETURN_FAILURE_ON_EXCEPTION(
isolate,
JSObject::DefineAccessor(object, name, getter,
isolate->factory()->null_value(), attrs));
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_SetDataProperties) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, target, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, source, 1);
// 2. If source is undefined or null, let keys be an empty List.
if (source->IsUndefined(isolate) || source->IsNull(isolate)) {
return ReadOnlyRoots(isolate).undefined_value();
}
MAYBE_RETURN(JSReceiver::SetOrCopyDataProperties(isolate, target, source),
ReadOnlyRoots(isolate).exception());
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_CopyDataProperties) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSObject, target, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, source, 1);
// 2. If source is undefined or null, let keys be an empty List.
if (source->IsUndefined(isolate) || source->IsNull(isolate)) {
return ReadOnlyRoots(isolate).undefined_value();
}
MAYBE_RETURN(JSReceiver::SetOrCopyDataProperties(isolate, target, source,
nullptr, false),
ReadOnlyRoots(isolate).exception());
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_CopyDataPropertiesWithExcludedProperties) {
HandleScope scope(isolate);
DCHECK_LE(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, source, 0);
// 2. If source is undefined or null, let keys be an empty List.
if (source->IsUndefined(isolate) || source->IsNull(isolate)) {
return ReadOnlyRoots(isolate).undefined_value();
}
ScopedVector<Handle<Object>> excluded_properties(args.length() - 1);
for (int i = 1; i < args.length(); i++) {
Handle<Object> property = args.at(i);
uint32_t property_num;
// We convert string to number if possible, in cases of computed
// properties resolving to numbers, which would've been strings
// instead because of our call to %ToName() in the desugaring for
// computed properties.
if (property->IsString() &&
String::cast(*property).AsArrayIndex(&property_num)) {
property = isolate->factory()->NewNumberFromUint(property_num);
}
excluded_properties[i - 1] = property;
}
Handle<JSObject> target =
isolate->factory()->NewJSObject(isolate->object_function());
MAYBE_RETURN(JSReceiver::SetOrCopyDataProperties(isolate, target, source,
&excluded_properties, false),
ReadOnlyRoots(isolate).exception());
return *target;
}
RUNTIME_FUNCTION(Runtime_DefineSetterPropertyUnchecked) {
HandleScope scope(isolate);
DCHECK_EQ(4, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
CONVERT_ARG_HANDLE_CHECKED(JSFunction, setter, 2);
CONVERT_PROPERTY_ATTRIBUTES_CHECKED(attrs, 3);
if (String::cast(setter->shared().Name()).length() == 0) {
Handle<Map> setter_map(setter->map(), isolate);
if (!JSFunction::SetName(setter, name, isolate->factory()->set_string())) {
return ReadOnlyRoots(isolate).exception();
}
CHECK_EQ(*setter_map, setter->map());
}
RETURN_FAILURE_ON_EXCEPTION(
isolate,
JSObject::DefineAccessor(object, name, isolate->factory()->null_value(),
setter, attrs));
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_ToObject) {
// Runtime call is implemented in InterpreterIntrinsics and lowered in
// JSIntrinsicLowering.
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_ToNumber) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, input, 0);
RETURN_RESULT_OR_FAILURE(isolate, Object::ToNumber(isolate, input));
}
RUNTIME_FUNCTION(Runtime_ToNumeric) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, input, 0);
RETURN_RESULT_OR_FAILURE(isolate, Object::ToNumeric(isolate, input));
}
RUNTIME_FUNCTION(Runtime_ToLength) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, input, 0);
RETURN_RESULT_OR_FAILURE(isolate, Object::ToLength(isolate, input));
}
RUNTIME_FUNCTION(Runtime_ToStringRT) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, input, 0);
RETURN_RESULT_OR_FAILURE(isolate, Object::ToString(isolate, input));
}
RUNTIME_FUNCTION(Runtime_ToName) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, input, 0);
RETURN_RESULT_OR_FAILURE(isolate, Object::ToName(isolate, input));
}
RUNTIME_FUNCTION(Runtime_HasInPrototypeChain) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, prototype, 1);
if (!object->IsJSReceiver()) return ReadOnlyRoots(isolate).false_value();
Maybe<bool> result = JSReceiver::HasInPrototypeChain(
isolate, Handle<JSReceiver>::cast(object), prototype);
MAYBE_RETURN(result, ReadOnlyRoots(isolate).exception());
return isolate->heap()->ToBoolean(result.FromJust());
}
// ES6 section 7.4.7 CreateIterResultObject ( value, done )
RUNTIME_FUNCTION(Runtime_CreateIterResultObject) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, value, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, done, 1);
return *isolate->factory()->NewJSIteratorResult(value,
done->BooleanValue(isolate));
}
RUNTIME_FUNCTION(Runtime_CreateDataProperty) {
HandleScope scope(isolate);
DCHECK_EQ(3, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, o, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
bool success;
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, o, key, &success, LookupIterator::OWN);
if (!success) return ReadOnlyRoots(isolate).exception();
MAYBE_RETURN(JSReceiver::CreateDataProperty(&it, value, Just(kThrowOnError)),
ReadOnlyRoots(isolate).exception());
return *value;
}
RUNTIME_FUNCTION(Runtime_GetOwnPropertyDescriptor) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
PropertyDescriptor desc;
Maybe<bool> found =
JSReceiver::GetOwnPropertyDescriptor(isolate, object, name, &desc);
MAYBE_RETURN(found, ReadOnlyRoots(isolate).exception());
if (!found.FromJust()) return ReadOnlyRoots(isolate).undefined_value();
return *desc.ToPropertyDescriptorObject(isolate);
}
RUNTIME_FUNCTION(Runtime_AddPrivateBrand) {
HandleScope scope(isolate);
DCHECK_EQ(args.length(), 2);
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
CONVERT_ARG_HANDLE_CHECKED(Symbol, brand, 1);
DCHECK(brand->is_private_name());
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, receiver, brand, LookupIterator::OWN);
if (it.IsFound()) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kVarRedeclaration, brand));
}
PropertyAttributes attributes =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
// TODO(joyee): we could use this slot to store something useful. For now,
// store the brand itself.
CHECK(Object::AddDataProperty(&it, brand, attributes, Just(kDontThrow),
StoreOrigin::kMaybeKeyed)
.FromJust());
return *receiver;
}
RUNTIME_FUNCTION(Runtime_AddPrivateField) {
HandleScope scope(isolate);
DCHECK_EQ(3, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSReceiver, o, 0);
CONVERT_ARG_HANDLE_CHECKED(Symbol, key, 1);
CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
DCHECK(key->is_private_name());
LookupIterator it =
LookupIterator::PropertyOrElement(isolate, o, key, LookupIterator::OWN);
if (it.IsFound()) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kVarRedeclaration, key));
}
CHECK(Object::AddDataProperty(&it, value, NONE, Just(kDontThrow),
StoreOrigin::kMaybeKeyed)
.FromJust());
return ReadOnlyRoots(isolate).undefined_value();
}
} // namespace internal
} // namespace v8