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chromium / v8 / v8.git / d1d4b9ce51d2ef3e9bd760e70642acddac30846f / . / src / builtins / builtins-object.cc
blob: 8cdfb0444601dbff5d181016d7f9dcb87d1549a9 [file] [log] [blame]
// Copyright 2016 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-object.h"
#include "src/builtins/builtins-utils.h"
#include "src/builtins/builtins.h"
#include "src/code-factory.h"
#include "src/code-stub-assembler.h"
#include "src/property-descriptor.h"
namespace v8 {
namespace internal {
typedef compiler::Node Node;
std::tuple<Node*, Node*, Node*> ObjectBuiltinsAssembler::EmitForInPrepare(
Node* object, Node* context, Label* call_runtime,
Label* nothing_to_iterate) {
Label use_cache(this);
CSA_ASSERT(this, IsJSReceiver(object));
CheckEnumCache(object, &use_cache, call_runtime);
Bind(&use_cache);
Node* map = LoadMap(object);
Node* enum_length = EnumLength(map);
GotoIf(WordEqual(enum_length, SmiConstant(0)), nothing_to_iterate);
Node* descriptors = LoadMapDescriptors(map);
Node* cache_offset =
LoadObjectField(descriptors, DescriptorArray::kEnumCacheOffset);
Node* enum_cache = LoadObjectField(
cache_offset, DescriptorArray::kEnumCacheBridgeCacheOffset);
return std::make_tuple(map, enum_cache, enum_length);
}
// -----------------------------------------------------------------------------
// ES6 section 19.1 Object Objects
TF_BUILTIN(ObjectHasOwnProperty, ObjectBuiltinsAssembler) {
Node* object = Parameter(0);
Node* key = Parameter(1);
Node* context = Parameter(4);
Label call_runtime(this), return_true(this), return_false(this);
// Smi receivers do not have own properties.
Label if_objectisnotsmi(this);
Branch(TaggedIsSmi(object), &return_false, &if_objectisnotsmi);
Bind(&if_objectisnotsmi);
Node* map = LoadMap(object);
Node* instance_type = LoadMapInstanceType(map);
{
Variable var_index(this, MachineType::PointerRepresentation());
Variable var_unique(this, MachineRepresentation::kTagged);
Label keyisindex(this), if_iskeyunique(this);
TryToName(key, &keyisindex, &var_index, &if_iskeyunique, &var_unique,
&call_runtime);
Bind(&if_iskeyunique);
TryHasOwnProperty(object, map, instance_type, var_unique.value(),
&return_true, &return_false, &call_runtime);
Bind(&keyisindex);
// 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, &call_runtime);
}
Bind(&return_true);
Return(BooleanConstant(true));
Bind(&return_false);
Return(BooleanConstant(false));
Bind(&call_runtime);
Return(CallRuntime(Runtime::kObjectHasOwnProperty, context, object, key));
}
// ES6 19.1.2.1 Object.assign
BUILTIN(ObjectAssign) {
HandleScope scope(isolate);
Handle<Object> target = args.atOrUndefined(isolate, 1);
// 1. Let to be ? ToObject(target).
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, target,
Object::ToObject(isolate, target));
Handle<JSReceiver> to = Handle<JSReceiver>::cast(target);
// 2. If only one argument was passed, return to.
if (args.length() == 2) return *to;
// 3. Let sources be the List of argument values starting with the
// second argument.
// 4. For each element nextSource of sources, in ascending index order,
for (int i = 2; i < args.length(); ++i) {
Handle<Object> next_source = args.at(i);
MAYBE_RETURN(JSReceiver::SetOrCopyDataProperties(isolate, to, next_source),
isolate->heap()->exception());
}
// 5. Return to.
return *to;
}
// ES6 section 19.1.3.4 Object.prototype.propertyIsEnumerable ( V )
BUILTIN(ObjectPrototypePropertyIsEnumerable) {
HandleScope scope(isolate);
Handle<JSReceiver> object;
Handle<Name> name;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, name, Object::ToName(isolate, args.atOrUndefined(isolate, 1)));
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, object, JSReceiver::ToObject(isolate, args.receiver()));
Maybe<PropertyAttributes> maybe =
JSReceiver::GetOwnPropertyAttributes(object, name);
if (!maybe.IsJust()) return isolate->heap()->exception();
if (maybe.FromJust() == ABSENT) return isolate->heap()->false_value();
return isolate->heap()->ToBoolean((maybe.FromJust() & DONT_ENUM) == 0);
}
void ObjectBuiltinsAssembler::IsString(Node* object, Label* if_string,
Label* if_notstring) {
Label if_notsmi(this);
Branch(TaggedIsSmi(object), if_notstring, &if_notsmi);
Bind(&if_notsmi);
{
Node* instance_type = LoadInstanceType(object);
Branch(IsStringInstanceType(instance_type), if_string, if_notstring);
}
}
void ObjectBuiltinsAssembler::ReturnToStringFormat(Node* context,
Node* string) {
Node* lhs = HeapConstant(factory()->NewStringFromStaticChars("[object "));
Node* rhs = HeapConstant(factory()->NewStringFromStaticChars("]"));
Callable callable =
CodeFactory::StringAdd(isolate(), STRING_ADD_CHECK_NONE, NOT_TENURED);
Return(CallStub(callable, context, CallStub(callable, context, lhs, string),
rhs));
}
// ES6 section 19.1.3.6 Object.prototype.toString
TF_BUILTIN(ObjectProtoToString, ObjectBuiltinsAssembler) {
Label return_undefined(this, Label::kDeferred),
return_null(this, Label::kDeferred),
return_arguments(this, Label::kDeferred), return_array(this),
return_api(this, Label::kDeferred), return_object(this),
return_regexp(this), return_function(this), return_error(this),
return_date(this), return_jsvalue(this),
return_jsproxy(this, Label::kDeferred);
Label if_isproxy(this, Label::kDeferred);
Label checkstringtag(this);
Label if_tostringtag(this), if_notostringtag(this);
Node* receiver = Parameter(0);
Node* context = Parameter(3);
GotoIf(WordEqual(receiver, UndefinedConstant()), &return_undefined);
GotoIf(WordEqual(receiver, NullConstant()), &return_null);
Callable to_object = CodeFactory::ToObject(isolate());
receiver = CallStub(to_object, context, receiver);
Node* receiver_instance_type = LoadInstanceType(receiver);
// for proxies, check IsArray before getting @@toStringTag
Variable var_proxy_is_array(this, MachineRepresentation::kTagged);
var_proxy_is_array.Bind(BooleanConstant(false));
Branch(Word32Equal(receiver_instance_type, Int32Constant(JS_PROXY_TYPE)),
&if_isproxy, &checkstringtag);
Bind(&if_isproxy);
{
// This can throw
var_proxy_is_array.Bind(
CallRuntime(Runtime::kArrayIsArray, context, receiver));
Goto(&checkstringtag);
}
Bind(&checkstringtag);
{
Node* to_string_tag_symbol =
HeapConstant(isolate()->factory()->to_string_tag_symbol());
GetPropertyStub stub(isolate());
Callable get_property =
Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
Node* to_string_tag_value =
CallStub(get_property, context, receiver, to_string_tag_symbol);
IsString(to_string_tag_value, &if_tostringtag, &if_notostringtag);
Bind(&if_tostringtag);
ReturnToStringFormat(context, to_string_tag_value);
}
Bind(&if_notostringtag);
{
size_t const kNumCases = 11;
Label* case_labels[kNumCases];
int32_t case_values[kNumCases];
case_labels[0] = &return_api;
case_values[0] = JS_API_OBJECT_TYPE;
case_labels[1] = &return_api;
case_values[1] = JS_SPECIAL_API_OBJECT_TYPE;
case_labels[2] = &return_arguments;
case_values[2] = JS_ARGUMENTS_TYPE;
case_labels[3] = &return_array;
case_values[3] = JS_ARRAY_TYPE;
case_labels[4] = &return_function;
case_values[4] = JS_BOUND_FUNCTION_TYPE;
case_labels[5] = &return_function;
case_values[5] = JS_FUNCTION_TYPE;
case_labels[6] = &return_error;
case_values[6] = JS_ERROR_TYPE;
case_labels[7] = &return_date;
case_values[7] = JS_DATE_TYPE;
case_labels[8] = &return_regexp;
case_values[8] = JS_REGEXP_TYPE;
case_labels[9] = &return_jsvalue;
case_values[9] = JS_VALUE_TYPE;
case_labels[10] = &return_jsproxy;
case_values[10] = JS_PROXY_TYPE;
Switch(receiver_instance_type, &return_object, case_values, case_labels,
arraysize(case_values));
Bind(&return_undefined);
Return(HeapConstant(isolate()->factory()->undefined_to_string()));
Bind(&return_null);
Return(HeapConstant(isolate()->factory()->null_to_string()));
Bind(&return_arguments);
Return(HeapConstant(isolate()->factory()->arguments_to_string()));
Bind(&return_array);
Return(HeapConstant(isolate()->factory()->array_to_string()));
Bind(&return_function);
Return(HeapConstant(isolate()->factory()->function_to_string()));
Bind(&return_error);
Return(HeapConstant(isolate()->factory()->error_to_string()));
Bind(&return_date);
Return(HeapConstant(isolate()->factory()->date_to_string()));
Bind(&return_regexp);
Return(HeapConstant(isolate()->factory()->regexp_to_string()));
Bind(&return_api);
{
Node* class_name = CallRuntime(Runtime::kClassOf, context, receiver);
ReturnToStringFormat(context, class_name);
}
Bind(&return_jsvalue);
{
Label return_boolean(this), return_number(this), return_string(this);
Node* value = LoadJSValueValue(receiver);
GotoIf(TaggedIsSmi(value), &return_number);
Node* instance_type = LoadInstanceType(value);
GotoIf(IsStringInstanceType(instance_type), &return_string);
GotoIf(Word32Equal(instance_type, Int32Constant(HEAP_NUMBER_TYPE)),
&return_number);
GotoIf(Word32Equal(instance_type, Int32Constant(ODDBALL_TYPE)),
&return_boolean);
CSA_ASSERT(this, Word32Equal(instance_type, Int32Constant(SYMBOL_TYPE)));
Goto(&return_object);
Bind(&return_string);
Return(HeapConstant(isolate()->factory()->string_to_string()));
Bind(&return_number);
Return(HeapConstant(isolate()->factory()->number_to_string()));
Bind(&return_boolean);
Return(HeapConstant(isolate()->factory()->boolean_to_string()));
}
Bind(&return_jsproxy);
{
GotoIf(WordEqual(var_proxy_is_array.value(), BooleanConstant(true)),
&return_array);
Node* map = LoadMap(receiver);
// Return object if the proxy {receiver} is not callable.
Branch(IsCallableMap(map), &return_function, &return_object);
}
// Default
Bind(&return_object);
Return(HeapConstant(isolate()->factory()->object_to_string()));
}
}
TF_BUILTIN(ObjectCreate, ObjectBuiltinsAssembler) {
Node* prototype = Parameter(1);
Node* properties = Parameter(2);
Node* context = Parameter(3 + 2);
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.
GotoUnless(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(this, MachineRepresentation::kTagged);
Variable properties(this, 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());
Return(instance);
}
}
Bind(&call_runtime);
{
Return(CallRuntime(Runtime::kObjectCreate, context, prototype, properties));
}
}
// ES6 section 19.1.2.3 Object.defineProperties
BUILTIN(ObjectDefineProperties) {
HandleScope scope(isolate);
DCHECK_EQ(3, args.length());
Handle<Object> target = args.at(1);
Handle<Object> properties = args.at(2);
RETURN_RESULT_OR_FAILURE(
isolate, JSReceiver::DefineProperties(isolate, target, properties));
}
// ES6 section 19.1.2.4 Object.defineProperty
BUILTIN(ObjectDefineProperty) {
HandleScope scope(isolate);
DCHECK_EQ(4, args.length());
Handle<Object> target = args.at(1);
Handle<Object> key = args.at(2);
Handle<Object> attributes = args.at(3);
return JSReceiver::DefineProperty(isolate, target, key, attributes);
}
namespace {
template <AccessorComponent which_accessor>
Object* ObjectDefineAccessor(Isolate* isolate, Handle<Object> object,
Handle<Object> name, Handle<Object> accessor) {
// 1. Let O be ? ToObject(this value).
Handle<JSReceiver> receiver;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
Object::ConvertReceiver(isolate, object));
// 2. If IsCallable(getter) is false, throw a TypeError exception.
if (!accessor->IsCallable()) {
MessageTemplate::Template message =
which_accessor == ACCESSOR_GETTER
? MessageTemplate::kObjectGetterExpectingFunction
: MessageTemplate::kObjectSetterExpectingFunction;
THROW_NEW_ERROR_RETURN_FAILURE(isolate, NewTypeError(message));
}
// 3. Let desc be PropertyDescriptor{[[Get]]: getter, [[Enumerable]]: true,
// [[Configurable]]: true}.
PropertyDescriptor desc;
if (which_accessor == ACCESSOR_GETTER) {
desc.set_get(accessor);
} else {
DCHECK(which_accessor == ACCESSOR_SETTER);
desc.set_set(accessor);
}
desc.set_enumerable(true);
desc.set_configurable(true);
// 4. Let key be ? ToPropertyKey(P).
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, name,
Object::ToPropertyKey(isolate, name));
// 5. Perform ? DefinePropertyOrThrow(O, key, desc).
// To preserve legacy behavior, we ignore errors silently rather than
// throwing an exception.
Maybe<bool> success = JSReceiver::DefineOwnProperty(
isolate, receiver, name, &desc, Object::DONT_THROW);
MAYBE_RETURN(success, isolate->heap()->exception());
if (!success.FromJust()) {
isolate->CountUsage(v8::Isolate::kDefineGetterOrSetterWouldThrow);
}
// 6. Return undefined.
return isolate->heap()->undefined_value();
}
Object* ObjectLookupAccessor(Isolate* isolate, Handle<Object> object,
Handle<Object> key, AccessorComponent component) {
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, object,
Object::ConvertReceiver(isolate, object));
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, key,
Object::ToPropertyKey(isolate, key));
bool success = false;
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, object, key, &success,
LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
DCHECK(success);
for (; it.IsFound(); it.Next()) {
switch (it.state()) {
case LookupIterator::INTERCEPTOR:
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::ACCESS_CHECK:
if (it.HasAccess()) continue;
isolate->ReportFailedAccessCheck(it.GetHolder<JSObject>());
RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
return isolate->heap()->undefined_value();
case LookupIterator::JSPROXY: {
PropertyDescriptor desc;
Maybe<bool> found = JSProxy::GetOwnPropertyDescriptor(
isolate, it.GetHolder<JSProxy>(), it.GetName(), &desc);
MAYBE_RETURN(found, isolate->heap()->exception());
if (found.FromJust()) {
if (component == ACCESSOR_GETTER && desc.has_get()) {
return *desc.get();
}
if (component == ACCESSOR_SETTER && desc.has_set()) {
return *desc.set();
}
return isolate->heap()->undefined_value();
}
Handle<Object> prototype;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, prototype, JSProxy::GetPrototype(it.GetHolder<JSProxy>()));
if (prototype->IsNull(isolate)) {
return isolate->heap()->undefined_value();
}
return ObjectLookupAccessor(isolate, prototype, key, component);
}
case LookupIterator::INTEGER_INDEXED_EXOTIC:
case LookupIterator::DATA:
return isolate->heap()->undefined_value();
case LookupIterator::ACCESSOR: {
Handle<Object> maybe_pair = it.GetAccessors();
if (maybe_pair->IsAccessorPair()) {
return *AccessorPair::GetComponent(
Handle<AccessorPair>::cast(maybe_pair), component);
}
}
}
}
return isolate->heap()->undefined_value();
}
} // namespace
// ES6 B.2.2.2 a.k.a.
// https://tc39.github.io/ecma262/#sec-object.prototype.__defineGetter__
BUILTIN(ObjectDefineGetter) {
HandleScope scope(isolate);
Handle<Object> object = args.at(0); // Receiver.
Handle<Object> name = args.at(1);
Handle<Object> getter = args.at(2);
return ObjectDefineAccessor<ACCESSOR_GETTER>(isolate, object, name, getter);
}
// ES6 B.2.2.3 a.k.a.
// https://tc39.github.io/ecma262/#sec-object.prototype.__defineSetter__
BUILTIN(ObjectDefineSetter) {
HandleScope scope(isolate);
Handle<Object> object = args.at(0); // Receiver.
Handle<Object> name = args.at(1);
Handle<Object> setter = args.at(2);
return ObjectDefineAccessor<ACCESSOR_SETTER>(isolate, object, name, setter);
}
// ES6 B.2.2.4 a.k.a.
// https://tc39.github.io/ecma262/#sec-object.prototype.__lookupGetter__
BUILTIN(ObjectLookupGetter) {
HandleScope scope(isolate);
Handle<Object> object = args.at(0);
Handle<Object> name = args.at(1);
return ObjectLookupAccessor(isolate, object, name, ACCESSOR_GETTER);
}
// ES6 B.2.2.5 a.k.a.
// https://tc39.github.io/ecma262/#sec-object.prototype.__lookupSetter__
BUILTIN(ObjectLookupSetter) {
HandleScope scope(isolate);
Handle<Object> object = args.at(0);
Handle<Object> name = args.at(1);
return ObjectLookupAccessor(isolate, object, name, ACCESSOR_SETTER);
}
// ES6 section 19.1.2.5 Object.freeze ( O )
BUILTIN(ObjectFreeze) {
HandleScope scope(isolate);
Handle<Object> object = args.atOrUndefined(isolate, 1);
if (object->IsJSReceiver()) {
MAYBE_RETURN(JSReceiver::SetIntegrityLevel(Handle<JSReceiver>::cast(object),
FROZEN, Object::THROW_ON_ERROR),
isolate->heap()->exception());
}
return *object;
}
// ES section 19.1.2.9 Object.getPrototypeOf ( O )
BUILTIN(ObjectGetPrototypeOf) {
HandleScope scope(isolate);
Handle<Object> object = args.atOrUndefined(isolate, 1);
Handle<JSReceiver> receiver;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
Object::ToObject(isolate, object));
RETURN_RESULT_OR_FAILURE(isolate,
JSReceiver::GetPrototype(isolate, receiver));
}
// ES6 section 19.1.2.21 Object.setPrototypeOf ( O, proto )
BUILTIN(ObjectSetPrototypeOf) {
HandleScope scope(isolate);
// 1. Let O be ? RequireObjectCoercible(O).
Handle<Object> object = args.atOrUndefined(isolate, 1);
if (object->IsNullOrUndefined(isolate)) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kCalledOnNullOrUndefined,
isolate->factory()->NewStringFromAsciiChecked(
"Object.setPrototypeOf")));
}
// 2. If Type(proto) is neither Object nor Null, throw a TypeError exception.
Handle<Object> proto = args.atOrUndefined(isolate, 2);
if (!proto->IsNull(isolate) && !proto->IsJSReceiver()) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kProtoObjectOrNull, proto));
}
// 3. If Type(O) is not Object, return O.
if (!object->IsJSReceiver()) return *object;
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(object);
// 4. Let status be ? O.[[SetPrototypeOf]](proto).
// 5. If status is false, throw a TypeError exception.
MAYBE_RETURN(
JSReceiver::SetPrototype(receiver, proto, true, Object::THROW_ON_ERROR),
isolate->heap()->exception());
// 6. Return O.
return *receiver;
}
// ES6 section B.2.2.1.1 get Object.prototype.__proto__
BUILTIN(ObjectPrototypeGetProto) {
HandleScope scope(isolate);
// 1. Let O be ? ToObject(this value).
Handle<JSReceiver> receiver;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, receiver, Object::ToObject(isolate, args.receiver()));
// 2. Return ? O.[[GetPrototypeOf]]().
RETURN_RESULT_OR_FAILURE(isolate,
JSReceiver::GetPrototype(isolate, receiver));
}
// ES6 section B.2.2.1.2 set Object.prototype.__proto__
BUILTIN(ObjectPrototypeSetProto) {
HandleScope scope(isolate);
// 1. Let O be ? RequireObjectCoercible(this value).
Handle<Object> object = args.receiver();
if (object->IsNullOrUndefined(isolate)) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kCalledOnNullOrUndefined,
isolate->factory()->NewStringFromAsciiChecked(
"set Object.prototype.__proto__")));
}
// 2. If Type(proto) is neither Object nor Null, return undefined.
Handle<Object> proto = args.at(1);
if (!proto->IsNull(isolate) && !proto->IsJSReceiver()) {
return isolate->heap()->undefined_value();
}
// 3. If Type(O) is not Object, return undefined.
if (!object->IsJSReceiver()) return isolate->heap()->undefined_value();
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(object);
// 4. Let status be ? O.[[SetPrototypeOf]](proto).
// 5. If status is false, throw a TypeError exception.
MAYBE_RETURN(
JSReceiver::SetPrototype(receiver, proto, true, Object::THROW_ON_ERROR),
isolate->heap()->exception());
// Return undefined.
return isolate->heap()->undefined_value();
}
// ES6 section 19.1.2.6 Object.getOwnPropertyDescriptor ( O, P )
BUILTIN(ObjectGetOwnPropertyDescriptor) {
HandleScope scope(isolate);
// 1. Let obj be ? ToObject(O).
Handle<Object> object = args.atOrUndefined(isolate, 1);
Handle<JSReceiver> receiver;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
Object::ToObject(isolate, object));
// 2. Let key be ? ToPropertyKey(P).
Handle<Object> property = args.atOrUndefined(isolate, 2);
Handle<Name> key;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, key,
Object::ToName(isolate, property));
// 3. Let desc be ? obj.[[GetOwnProperty]](key).
PropertyDescriptor desc;
Maybe<bool> found =
JSReceiver::GetOwnPropertyDescriptor(isolate, receiver, key, &desc);
MAYBE_RETURN(found, isolate->heap()->exception());
// 4. Return FromPropertyDescriptor(desc).
if (!found.FromJust()) return isolate->heap()->undefined_value();
return *desc.ToObject(isolate);
}
namespace {
Object* GetOwnPropertyKeys(Isolate* isolate, BuiltinArguments args,
PropertyFilter filter) {
HandleScope scope(isolate);
Handle<Object> object = args.atOrUndefined(isolate, 1);
Handle<JSReceiver> receiver;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
Object::ToObject(isolate, object));
Handle<FixedArray> keys;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, keys,
KeyAccumulator::GetKeys(receiver, KeyCollectionMode::kOwnOnly, filter,
GetKeysConversion::kConvertToString));
return *isolate->factory()->NewJSArrayWithElements(keys);
}
} // namespace
// ES6 section 19.1.2.7 Object.getOwnPropertyNames ( O )
BUILTIN(ObjectGetOwnPropertyNames) {
return GetOwnPropertyKeys(isolate, args, SKIP_SYMBOLS);
}
// ES6 section 19.1.2.8 Object.getOwnPropertySymbols ( O )
BUILTIN(ObjectGetOwnPropertySymbols) {
return GetOwnPropertyKeys(isolate, args, SKIP_STRINGS);
}
// ES#sec-object.is Object.is ( value1, value2 )
BUILTIN(ObjectIs) {
SealHandleScope shs(isolate);
DCHECK_EQ(3, args.length());
Handle<Object> value1 = args.at(1);
Handle<Object> value2 = args.at(2);
return isolate->heap()->ToBoolean(value1->SameValue(*value2));
}
// ES6 section 19.1.2.11 Object.isExtensible ( O )
BUILTIN(ObjectIsExtensible) {
HandleScope scope(isolate);
Handle<Object> object = args.atOrUndefined(isolate, 1);
Maybe<bool> result =
object->IsJSReceiver()
? JSReceiver::IsExtensible(Handle<JSReceiver>::cast(object))
: Just(false);
MAYBE_RETURN(result, isolate->heap()->exception());
return isolate->heap()->ToBoolean(result.FromJust());
}
// ES6 section 19.1.2.12 Object.isFrozen ( O )
BUILTIN(ObjectIsFrozen) {
HandleScope scope(isolate);
Handle<Object> object = args.atOrUndefined(isolate, 1);
Maybe<bool> result = object->IsJSReceiver()
? JSReceiver::TestIntegrityLevel(
Handle<JSReceiver>::cast(object), FROZEN)
: Just(true);
MAYBE_RETURN(result, isolate->heap()->exception());
return isolate->heap()->ToBoolean(result.FromJust());
}
// ES6 section 19.1.2.13 Object.isSealed ( O )
BUILTIN(ObjectIsSealed) {
HandleScope scope(isolate);
Handle<Object> object = args.atOrUndefined(isolate, 1);
Maybe<bool> result = object->IsJSReceiver()
? JSReceiver::TestIntegrityLevel(
Handle<JSReceiver>::cast(object), SEALED)
: Just(true);
MAYBE_RETURN(result, isolate->heap()->exception());
return isolate->heap()->ToBoolean(result.FromJust());
}
// ES6 section 19.1.2.14 Object.keys ( O )
BUILTIN(ObjectKeys) {
HandleScope scope(isolate);
Handle<Object> object = args.atOrUndefined(isolate, 1);
Handle<JSReceiver> receiver;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
Object::ToObject(isolate, object));
Handle<FixedArray> keys;
int enum_length = receiver->map()->EnumLength();
if (enum_length != kInvalidEnumCacheSentinel &&
JSObject::cast(*receiver)->elements() ==
isolate->heap()->empty_fixed_array()) {
DCHECK(receiver->IsJSObject());
DCHECK(!JSObject::cast(*receiver)->HasNamedInterceptor());
DCHECK(!JSObject::cast(*receiver)->IsAccessCheckNeeded());
DCHECK(!receiver->map()->has_hidden_prototype());
DCHECK(JSObject::cast(*receiver)->HasFastProperties());
if (enum_length == 0) {
keys = isolate->factory()->empty_fixed_array();
} else {
Handle<FixedArray> cache(
receiver->map()->instance_descriptors()->GetEnumCache());
keys = isolate->factory()->CopyFixedArrayUpTo(cache, enum_length);
}
} else {
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, keys,
KeyAccumulator::GetKeys(receiver, KeyCollectionMode::kOwnOnly,
ENUMERABLE_STRINGS,
GetKeysConversion::kConvertToString));
}
return *isolate->factory()->NewJSArrayWithElements(keys, FAST_ELEMENTS);
}
BUILTIN(ObjectValues) {
HandleScope scope(isolate);
Handle<Object> object = args.atOrUndefined(isolate, 1);
Handle<JSReceiver> receiver;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
Object::ToObject(isolate, object));
Handle<FixedArray> values;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, values, JSReceiver::GetOwnValues(receiver, ENUMERABLE_STRINGS));
return *isolate->factory()->NewJSArrayWithElements(values);
}
BUILTIN(ObjectEntries) {
HandleScope scope(isolate);
Handle<Object> object = args.atOrUndefined(isolate, 1);
Handle<JSReceiver> receiver;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
Object::ToObject(isolate, object));
Handle<FixedArray> entries;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, entries,
JSReceiver::GetOwnEntries(receiver, ENUMERABLE_STRINGS));
return *isolate->factory()->NewJSArrayWithElements(entries);
}
BUILTIN(ObjectGetOwnPropertyDescriptors) {
HandleScope scope(isolate);
Handle<Object> object = args.atOrUndefined(isolate, 1);
Handle<JSReceiver> receiver;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
Object::ToObject(isolate, object));
Handle<FixedArray> keys;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, keys, KeyAccumulator::GetKeys(
receiver, KeyCollectionMode::kOwnOnly, ALL_PROPERTIES,
GetKeysConversion::kConvertToString));
Handle<JSObject> descriptors =
isolate->factory()->NewJSObject(isolate->object_function());
for (int i = 0; i < keys->length(); ++i) {
Handle<Name> key = Handle<Name>::cast(FixedArray::get(*keys, i, isolate));
PropertyDescriptor descriptor;
Maybe<bool> did_get_descriptor = JSReceiver::GetOwnPropertyDescriptor(
isolate, receiver, key, &descriptor);
MAYBE_RETURN(did_get_descriptor, isolate->heap()->exception());
if (!did_get_descriptor.FromJust()) continue;
Handle<Object> from_descriptor = descriptor.ToObject(isolate);
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, descriptors, key, descriptors, LookupIterator::OWN);
Maybe<bool> success = JSReceiver::CreateDataProperty(&it, from_descriptor,
Object::DONT_THROW);
CHECK(success.FromJust());
}
return *descriptors;
}
// ES6 section 19.1.2.15 Object.preventExtensions ( O )
BUILTIN(ObjectPreventExtensions) {
HandleScope scope(isolate);
Handle<Object> object = args.atOrUndefined(isolate, 1);
if (object->IsJSReceiver()) {
MAYBE_RETURN(JSReceiver::PreventExtensions(Handle<JSReceiver>::cast(object),
Object::THROW_ON_ERROR),
isolate->heap()->exception());
}
return *object;
}
// ES6 section 19.1.2.17 Object.seal ( O )
BUILTIN(ObjectSeal) {
HandleScope scope(isolate);
Handle<Object> object = args.atOrUndefined(isolate, 1);
if (object->IsJSReceiver()) {
MAYBE_RETURN(JSReceiver::SetIntegrityLevel(Handle<JSReceiver>::cast(object),
SEALED, Object::THROW_ON_ERROR),
isolate->heap()->exception());
}
return *object;
}
TF_BUILTIN(CreateIterResultObject, ObjectBuiltinsAssembler) {
typedef CreateIterResultObjectDescriptor Descriptor;
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) {
typedef HasPropertyDescriptor Descriptor;
Node* key = Parameter(Descriptor::kKey);
Node* object = Parameter(Descriptor::kObject);
Node* context = Parameter(Descriptor::kContext);
Return(HasProperty(object, key, context, Runtime::kHasProperty));
}
TF_BUILTIN(ForInFilter, ObjectBuiltinsAssembler) {
typedef ForInFilterDescriptor Descriptor;
Node* key = Parameter(Descriptor::kKey);
Node* object = Parameter(Descriptor::kObject);
Node* context = Parameter(Descriptor::kContext);
Return(ForInFilter(key, object, context));
}
TF_BUILTIN(ForInNext, ObjectBuiltinsAssembler) {
typedef ForInNextDescriptor Descriptor;
Label filter(this);
Node* object = Parameter(Descriptor::kObject);
Node* cache_array = Parameter(Descriptor::kCacheArray);
Node* cache_type = Parameter(Descriptor::kCacheType);
Node* index = Parameter(Descriptor::kIndex);
Node* context = Parameter(Descriptor::kContext);
Node* key = LoadFixedArrayElement(cache_array, SmiUntag(index));
Node* map = LoadMap(object);
GotoUnless(WordEqual(map, cache_type), &filter);
Return(key);
Bind(&filter);
Return(ForInFilter(key, object, context));
}
TF_BUILTIN(ForInPrepare, ObjectBuiltinsAssembler) {
typedef ForInPrepareDescriptor Descriptor;
Label call_runtime(this), nothing_to_iterate(this);
Node* object = Parameter(Descriptor::kObject);
Node* context = Parameter(Descriptor::kContext);
Node* cache_type;
Node* cache_array;
Node* cache_length;
std::tie(cache_type, cache_array, cache_length) =
EmitForInPrepare(object, context, &call_runtime, &nothing_to_iterate);
Return(cache_type, cache_array, cache_length);
Bind(&call_runtime);
TailCallRuntime(Runtime::kForInPrepare, context, object);
Bind(&nothing_to_iterate);
{
Node* zero = SmiConstant(0);
Return(zero, zero, zero);
}
}
TF_BUILTIN(InstanceOf, ObjectBuiltinsAssembler) {
typedef CompareDescriptor Descriptor;
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) {
typedef CompareDescriptor Descriptor;
Node* constructor = Parameter(Descriptor::kLeft);
Node* object = Parameter(Descriptor::kRight);
Node* context = Parameter(Descriptor::kContext);
Return(OrdinaryHasInstance(context, constructor, object));
}
TF_BUILTIN(GetSuperConstructor, ObjectBuiltinsAssembler) {
typedef TypeofDescriptor Descriptor;
Node* object = Parameter(Descriptor::kObject);
Node* context = Parameter(Descriptor::kContext);
Return(GetSuperConstructor(object, context));
}
} // namespace internal
} // namespace v8