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Object.cpp
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2200 lines (1948 loc) · 93.2 KB
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/*
* Copyright (c) 2016-present Samsung Electronics Co., Ltd
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*/
#include "Escargot.h"
#include "Object.h"
#include "Context.h"
#include "VMInstance.h"
#include "ErrorObject.h"
#include "FunctionObject.h"
#include "ArrayObject.h"
#include "BoundFunctionObject.h"
#include "StringObject.h"
#include "NumberObject.h"
#include "BooleanObject.h"
#include "SymbolObject.h"
#include "BigIntObject.h"
#include "ProxyObject.h"
#include "PrototypeObject.h"
#include "ScriptClassConstructorFunctionObject.h"
#include "Global.h"
namespace Escargot {
COMPILE_ASSERT(OBJECT_PROPERTY_NAME_UINT32_VIAS == (OBJECT_PROPERTY_NAME_ATOMIC_STRING_VIAS << 1), "");
COMPILE_ASSERT(OBJECT_PROPERTY_NAME_UINT32_VIAS <= (1 << 3), "");
ObjectStructurePropertyName::ObjectStructurePropertyName()
: m_data(((size_t)AtomicString().string()) | OBJECT_PROPERTY_NAME_ATOMIC_STRING_VIAS)
{
}
ObjectStructurePropertyName::ObjectStructurePropertyName(const Value& value)
{
// accept string or symbol value only
ASSERT(value.isString() || value.isSymbol());
if (value.isString()) {
m_data = reinterpret_cast<size_t>(value.asString());
} else {
m_data = reinterpret_cast<size_t>(value.asSymbol());
}
}
ObjectStructurePropertyName::ObjectStructurePropertyName(ExecutionState& state, const Value& valueIn)
{
Value value = valueIn.toPrimitive(state, Value::PreferString);
if (UNLIKELY(value.isSymbol())) {
m_data = (size_t)value.asSymbol();
return;
}
String* string = value.toString(state);
size_t v = string->getTypeTag();
if (v > POINTER_VALUE_STRING_TAG_IN_DATA) {
ASSERT(v == ((v & ~POINTER_VALUE_STRING_TAG_IN_DATA) | OBJECT_PROPERTY_NAME_ATOMIC_STRING_VIAS));
m_data = v;
return;
}
const auto& data = string->bufferAccessData();
if (data.length == 0) {
m_data = ((size_t)AtomicString().string()) | OBJECT_PROPERTY_NAME_ATOMIC_STRING_VIAS;
return;
}
bool needsRemainNormalString = false;
char16_t c = data.charAt(0);
if ((c == '.' || (c >= '0' && c <= '9')) && data.length > 16) {
needsRemainNormalString = true;
}
if (UNLIKELY(needsRemainNormalString)) {
m_data = (size_t)string;
} else {
if (c < ESCARGOT_ASCII_TABLE_MAX && (data.length == 1)) {
m_data = ((size_t)state.context()->staticStrings().asciiTable[c].string()) | OBJECT_PROPERTY_NAME_ATOMIC_STRING_VIAS;
} else {
m_data = ((size_t)AtomicString(state, string).string()) | OBJECT_PROPERTY_NAME_ATOMIC_STRING_VIAS;
}
}
}
ObjectStructurePropertyName ObjectPropertyName::toObjectStructurePropertyNameUintCase(ExecutionState& state) const
{
ASSERT(isUIntType());
auto uint = uintValue();
if (uint < ESCARGOT_STRINGS_NUMBERS_MAX) {
return ObjectStructurePropertyName(state.context()->staticStrings().numbers[uint]);
}
return ObjectStructurePropertyName(state, String::fromDouble(uint));
}
ObjectRareData::ObjectRareData(Object* obj)
: m_isExtensible(true)
, m_isEverSetAsPrototypeObject(false)
, m_isArrayObjectLengthWritable(true)
, m_isSpreadArrayObject(false)
, m_isFinalizerRegistered(false)
, m_isInlineCacheable(true)
, m_hasExtendedExtraData(false)
#if defined(ESCARGOT_ENABLE_TEST)
, m_isHTMLDDA(false)
#endif
, m_arrayObjectFastModeBufferExpandCount(0)
, m_extraData(nullptr)
, m_prototype(obj ? obj->m_prototype : nullptr)
, m_internalSlot(nullptr)
{
}
void* ObjectRareData::operator new(size_t size)
{
static MAY_THREAD_LOCAL bool typeInited = false;
static MAY_THREAD_LOCAL GC_descr descr;
if (!typeInited) {
GC_word obj_bitmap[GC_BITMAP_SIZE(ObjectRareData)] = { 0 };
GC_set_bit(obj_bitmap, GC_WORD_OFFSET(ObjectRareData, m_prototype));
GC_set_bit(obj_bitmap, GC_WORD_OFFSET(ObjectRareData, m_extraData));
GC_set_bit(obj_bitmap, GC_WORD_OFFSET(ObjectRareData, m_internalSlot));
descr = GC_make_descriptor(obj_bitmap, GC_WORD_LEN(ObjectRareData));
typeInited = true;
}
return GC_MALLOC_EXPLICITLY_TYPED(size, descr);
}
Value ObjectGetResult::valueSlowCase(ExecutionState& state, const Value& receiver) const
{
if (LIKELY(isDataProperty())) {
return m_nativeGetterSetterData.m_nativeGetterSetterData->m_getter(state, m_nativeGetterSetterData.m_object, receiver, m_nativeGetterSetterData.m_internalData);
}
if (m_jsGetterSetter->hasGetter() && m_jsGetterSetter->getter().isCallable()) {
return Object::call(state, m_jsGetterSetter->getter(), receiver, 0, nullptr);
}
return Value();
}
ObjectPropertyDescriptor ObjectGetResult::convertToPropertyDescriptor(ExecutionState& state, const Value& receiver)
{
ASSERT(hasValue());
ObjectPropertyDescriptor desc;
if (isDataProperty()) {
desc = ObjectPropertyDescriptor(this->value(state, receiver));
desc.setWritable(isWritable());
} else {
desc = ObjectPropertyDescriptor(*this->jsGetterSetter(), ObjectPropertyDescriptor::NotPresent);
}
desc.setEnumerable(isEnumerable());
desc.setConfigurable(isConfigurable());
ASSERT(desc.checkProperty());
return desc;
}
// https://262.ecma-international.org/#sec-frompropertydescriptor
Value ObjectGetResult::fromPropertyDescriptor(ExecutionState& state, const Value& receiver)
{
// If Desc is undefined, then return undefined.
if (!hasValue()) {
return Value();
}
// Let obj be the result of creating a new object as if by the expression new Object() where Object is the standard built-in constructor with that name.
Object* obj = new Object(state);
// If IsDataDescriptor(Desc) is true, then
if (isDataProperty()) {
// Call the [[DefineOwnProperty]] internal method of obj with arguments "value", Property Descriptor {[[Value]]: Desc.[[Value]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
obj->defineOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().value), ObjectPropertyDescriptor(this->value(state, receiver), ObjectPropertyDescriptor::AllPresent));
// Call the [[DefineOwnProperty]] internal method of obj with arguments "writable", Property Descriptor {[[Value]]: Desc.[[Writable]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
obj->defineOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().writable), ObjectPropertyDescriptor(Value(isWritable()), ObjectPropertyDescriptor::AllPresent));
} else {
Value get;
if (jsGetterSetter()->hasGetter())
get = jsGetterSetter()->getter();
Value set;
if (jsGetterSetter()->hasSetter())
set = jsGetterSetter()->setter();
// Call the [[DefineOwnProperty]] internal method of obj with arguments "get", Property Descriptor {[[Value]]: Desc.[[Writable]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
obj->defineOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().get), ObjectPropertyDescriptor(get, ObjectPropertyDescriptor::AllPresent));
// Call the [[DefineOwnProperty]] internal method of obj with arguments "set", Property Descriptor {[[Value]]: Desc.[[Writable]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
obj->defineOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().set), ObjectPropertyDescriptor(set, ObjectPropertyDescriptor::AllPresent));
}
// Call the [[DefineOwnProperty]] internal method of obj with arguments "enumerable", Property Descriptor {[[Value]]: Desc.[[Writable]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
obj->defineOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().enumerable), ObjectPropertyDescriptor(Value(isEnumerable()), ObjectPropertyDescriptor::AllPresent));
// Call the [[DefineOwnProperty]] internal method of obj with arguments "configurable", Property Descriptor {[[Value]]: Desc.[[Writable]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
obj->defineOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().configurable), ObjectPropertyDescriptor(Value(isConfigurable()), ObjectPropertyDescriptor::AllPresent));
return obj;
}
ObjectPropertyDescriptor::ObjectPropertyDescriptor(ExecutionState& state, Object* obj)
: m_isDataProperty(true)
{
m_property = NotPresent;
const StaticStrings* strings = &state.context()->staticStrings();
auto desc = obj->get(state, ObjectPropertyName(strings->enumerable));
if (desc.hasValue())
setEnumerable(desc.value(state, obj).toBoolean(state));
desc = obj->get(state, ObjectPropertyName(strings->configurable));
if (desc.hasValue())
setConfigurable(desc.value(state, obj).toBoolean(state));
bool hasValue = false;
desc = obj->get(state, ObjectPropertyName(strings->value));
if (desc.hasValue()) {
setValue(desc.value(state, obj));
hasValue = true;
}
bool hasWritable = false;
desc = obj->get(state, ObjectPropertyName(strings->writable));
if (desc.hasValue()) {
setWritable(desc.value(state, obj).toBoolean(state));
hasWritable = true;
}
desc = obj->get(state, ObjectPropertyName(strings->get));
if (desc.hasValue()) {
Value getter = desc.value(state, obj);
if (!getter.isCallable() && !getter.isUndefined()) {
ErrorObject::throwBuiltinError(state, ErrorObject::TypeError, "Getter must be a function or undefined");
} else {
m_isDataProperty = false;
m_getterSetter = JSGetterSetter(getter, Value(Value::EmptyValue));
}
}
desc = obj->get(state, ObjectPropertyName(strings->set));
if (desc.hasValue()) {
Value setter = desc.value(state, obj);
if (!setter.isCallable() && !setter.isUndefined()) {
ErrorObject::throwBuiltinError(state, ErrorObject::TypeError, "Setter must be a function or undefined");
} else {
if (m_isDataProperty) {
m_isDataProperty = false;
m_getterSetter = JSGetterSetter(Value(Value::EmptyValue), setter);
} else {
m_getterSetter.m_setter = setter;
}
}
}
if (!m_isDataProperty && (hasWritable || hasValue)) {
ErrorObject::throwBuiltinError(state, ErrorObject::TypeError, "Invalid property descriptor. Cannot both specify accessors and a value or writable attribute");
}
ASSERT(checkProperty());
}
void ObjectPropertyDescriptor::setEnumerable(bool enumerable)
{
if (enumerable) {
m_property = (PresentAttribute)(m_property | EnumerablePresent);
m_property = (PresentAttribute)(m_property & ~NonEnumerablePresent);
} else {
m_property = (PresentAttribute)(m_property | NonEnumerablePresent);
m_property = (PresentAttribute)(m_property & ~EnumerablePresent);
}
}
void ObjectPropertyDescriptor::setConfigurable(bool configurable)
{
if (configurable) {
m_property = (PresentAttribute)(m_property | ConfigurablePresent);
m_property = (PresentAttribute)(m_property & ~NonConfigurablePresent);
} else {
m_property = (PresentAttribute)(m_property | NonConfigurablePresent);
m_property = (PresentAttribute)(m_property & ~ConfigurablePresent);
}
}
void ObjectPropertyDescriptor::setWritable(bool writable)
{
if (writable) {
m_property = (PresentAttribute)(m_property | WritablePresent);
m_property = (PresentAttribute)(m_property & ~NonWritablePresent);
} else {
m_property = (PresentAttribute)(m_property | NonWritablePresent);
m_property = (PresentAttribute)(m_property & ~WritablePresent);
}
}
void ObjectPropertyDescriptor::setValue(const Value& v)
{
m_property = (PresentAttribute)(m_property | ValuePresent);
m_value = v;
}
ObjectStructurePropertyDescriptor ObjectPropertyDescriptor::toObjectStructurePropertyDescriptor() const
{
if (isDataProperty()) {
int f = 0;
if (isWritable()) {
f = ObjectStructurePropertyDescriptor::WritablePresent;
}
if (isConfigurable()) {
f |= ObjectStructurePropertyDescriptor::ConfigurablePresent;
}
if (isEnumerable()) {
f |= ObjectStructurePropertyDescriptor::EnumerablePresent;
}
return ObjectStructurePropertyDescriptor::createDataDescriptor((ObjectStructurePropertyDescriptor::PresentAttribute)f);
} else {
int f = 0;
if (isConfigurable()) {
f |= ObjectStructurePropertyDescriptor::ConfigurablePresent;
}
if (isEnumerable()) {
f |= ObjectStructurePropertyDescriptor::EnumerablePresent;
}
if (hasJSGetter()) {
f |= ObjectStructurePropertyDescriptor::HasJSGetter;
}
if (hasJSSetter()) {
f |= ObjectStructurePropertyDescriptor::HasJSSetter;
}
return ObjectStructurePropertyDescriptor::createAccessorDescriptor((ObjectStructurePropertyDescriptor::PresentAttribute)f);
}
}
ObjectPropertyDescriptor ObjectPropertyDescriptor::fromObjectStructurePropertyDescriptor(const ObjectStructurePropertyDescriptor& desc, const Value& value)
{
const ObjectPropertyDescriptor::PresentAttribute flag = ObjectPropertyDescriptor::NotPresent;
// If IsDataDescriptor(Desc) is true, then
if (desc.isDataProperty()) {
// Call the [[DefineOwnProperty]] internal method of obj with arguments "value", Property Descriptor {[[Value]]: Desc.[[Value]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
ObjectPropertyDescriptor ret(value, flag);
// Call the [[DefineOwnProperty]] internal method of obj with arguments "writable", Property Descriptor {[[Value]]: Desc.[[Writable]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
ret.setWritable(desc.isWritable());
// Call the [[DefineOwnProperty]] internal method of obj with arguments "enumerable", Property Descriptor {[[Value]]: Desc.[[Writable]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
ret.setEnumerable(desc.isEnumerable());
// Call the [[DefineOwnProperty]] internal method of obj with arguments "configurable", Property Descriptor {[[Value]]: Desc.[[Writable]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
ret.setConfigurable(desc.isConfigurable());
return ret;
} else {
// Call the [[DefineOwnProperty]] internal method of obj with arguments "get", Property Descriptor {[[Value]]: Desc.[[Writable]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
// Call the [[DefineOwnProperty]] internal method of obj with arguments "set", Property Descriptor {[[Value]]: Desc.[[Writable]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
ObjectPropertyDescriptor ret(*value.asPointerValue()->asJSGetterSetter(), flag);
// Call the [[DefineOwnProperty]] internal method of obj with arguments "enumerable", Property Descriptor {[[Value]]: Desc.[[Writable]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
ret.setEnumerable(desc.isEnumerable());
// Call the [[DefineOwnProperty]] internal method of obj with arguments "configurable", Property Descriptor {[[Value]]: Desc.[[Writable]], [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: true}, and false.
ret.setConfigurable(desc.isConfigurable());
return ret;
}
}
// https://www.ecma-international.org/ecma-262/6.0/#sec-frompropertydescriptor
Object* ObjectPropertyDescriptor::fromObjectPropertyDescriptor(ExecutionState& state, const ObjectPropertyDescriptor& desc)
{
auto strings = &state.context()->staticStrings();
// 1. If Desc is undefined, return undefined.
// 2. Let obj be ObjectCreate(%ObjectPrototype%).
Object* obj = new Object(state);
// 4. If Desc has a [[Value]] field, then
if (!desc.isAccessorDescriptor()) {
// 4.a Perform CreateDataProperty(obj, "value", Desc.[[Value]]).
// 5. If Desc has a [[Writable]] field, then
// 5.a Perform CreateDataProperty(obj, "writable", Desc.[[Writable]]).
if (desc.isValuePresent()) {
obj->defineOwnProperty(state, ObjectPropertyName(state, strings->value.string()), ObjectPropertyDescriptor(desc.value(), ObjectPropertyDescriptor::AllPresent));
}
if (desc.isWritablePresent()) {
obj->defineOwnProperty(state, ObjectPropertyName(state, strings->writable.string()), ObjectPropertyDescriptor(Value(desc.isWritable()), ObjectPropertyDescriptor::AllPresent));
}
} else {
ASSERT(desc.hasJSGetter() || desc.hasJSSetter());
// 6. If Desc has a [[Get]] field, then
if (desc.hasJSGetter()) {
// 6.a. Perform CreateDataProperty(obj, "get", Desc.[[Get]]).
obj->defineOwnProperty(state, ObjectPropertyName(state, strings->get.string()), ObjectPropertyDescriptor(desc.getterSetter().getter(), ObjectPropertyDescriptor::AllPresent));
}
// 7. If Desc has a [[Set]] field, then
if (desc.hasJSSetter()) {
// 7.a. Perform CreateDataProperty(obj, "set", Desc.[[Set]])
obj->defineOwnProperty(state, ObjectPropertyName(state, strings->set.string()), ObjectPropertyDescriptor(desc.getterSetter().setter(), ObjectPropertyDescriptor::AllPresent));
}
}
// 8. If Desc has an [[Enumerable]] field, then
// 8.a. Perform CreateDataProperty(obj, "enumerable", Desc.[[Enumerable]]).
if (desc.isEnumerablePresent()) {
obj->defineOwnProperty(state, ObjectPropertyName(state, strings->enumerable.string()), ObjectPropertyDescriptor(Value(desc.isEnumerable()), ObjectPropertyDescriptor::AllPresent));
}
// 9. If Desc has a [[Configurable]] field, then
// 9.a. Perform CreateDataProperty(obj , "configurable", Desc.[[Configurable]]).
if (desc.isConfigurablePresent()) {
obj->defineOwnProperty(state, ObjectPropertyName(state, strings->configurable.string()), ObjectPropertyDescriptor(Value(desc.isConfigurable()), ObjectPropertyDescriptor::AllPresent));
}
// 10. Assert: all of the above CreateDataProperty operations return true.
// 11. Return obj.
return obj;
}
void ObjectPropertyDescriptor::completePropertyDescriptor(ObjectPropertyDescriptor& desc)
{
// 1. ReturnIfAbrupt(Desc).
// 2. Assert: Desc is a Property Descriptor
// 3. Let like be Record{[[Value]]: undefined, [[Writable]]: false, [[Get]]: undefined, [[Set]]: undefined, [[Enumerable]]: false, [[Configurable]]: false}.
// 4. If either IsGenericDescriptor(Desc) or IsDataDescriptor(Desc) is true, then
if (desc.isGenericDescriptor() || desc.isDataDescriptor()) {
// a. If Desc does not have a [[Value]] field, set Desc.[[Value]] to like.[[Value]].
if (!desc.isValuePresent()) {
desc.setValue(Value());
}
// If Desc does not have a [[Writable]] field, set Desc.[[Writable]] to like.[[Writable]].
if (!desc.isWritablePresent()) {
desc.setWritable(false);
}
} else {
// a. If Desc does not have a [[Get]] field, set Desc.[[Get]] to like.[[Get]].
if (!desc.hasJSGetter()) {
desc.m_getterSetter.m_getter = Value();
}
// b. If Desc does not have a [[Set]] field, set Desc.[[Set]] to like.[[Set]].
if (!desc.hasJSSetter()) {
desc.m_getterSetter.m_setter = Value();
}
}
// 6. If Desc does not have an [[Enumerable]] field, set Desc.[[Enumerable]] to like.[[Enumerable]].
if (!desc.isEnumerablePresent()) {
desc.setEnumerable(false);
}
// 7. If Desc does not have a [[Configurable]] field, set Desc.[[Configurable]] to like.[[Configurable]].
if (!desc.isConfigurablePresent()) {
desc.setConfigurable(false);
}
// 8. Return Desc.
}
Object::Object(ExecutionState& state)
: m_structure(state.context()->defaultStructureForObject())
, m_prototype(state.context()->globalObject()->objectPrototype())
{
ASSERT(!!m_prototype);
m_values.resizeWithUninitializedValues(0, ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER);
}
// https://www.ecma-international.org/ecma-262/10.0/#sec-objectcreate
Object::Object(ExecutionState& state, Object* proto)
: m_structure(state.context()->defaultStructureForObject())
, m_prototype(proto)
{
// proto has been marked as a prototype object
ASSERT(!!proto);
ASSERT(proto->isEverSetAsPrototypeObject());
// create a new ordinary object
m_values.resizeWithUninitializedValues(0, ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER);
}
Object::Object(ExecutionState& state, Object::PrototypeIsNullTag)
: m_structure(state.context()->defaultStructureForObject())
, m_prototype(nullptr)
{
// create a new ordinary object
m_values.resizeWithUninitializedValues(0, ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER);
}
Object::Object(ExecutionState& state, Object* proto, size_t defaultSpace)
: m_structure(state.context()->defaultStructureForObject())
, m_prototype(proto)
{
// proto has been marked as a prototype object
ASSERT(!!proto);
ASSERT(proto->isEverSetAsPrototypeObject());
m_values.resizeWithUninitializedValues(0, defaultSpace);
}
Object::Object(ObjectStructure* structure, ObjectPropertyValueVector&& values, Object* proto)
: m_structure(structure)
, m_prototype(proto)
, m_values(std::move(values))
{
ASSERT(!!structure);
ASSERT(!!proto);
}
// https://www.ecma-international.org/ecma-262/6.0/#sec-isconcatspreadable
bool Object::isConcatSpreadable(ExecutionState& state)
{
// If Type(O) is not Object, return false.
if (!isObject()) {
return false;
}
// Let spreadable be Get(O, @@isConcatSpreadable).
Value spreadable = get(state, ObjectPropertyName(state.context()->vmInstance()->globalSymbols().isConcatSpreadable)).value(state, this);
// If spreadable is not undefined, return ToBoolean(spreadable).
if (!spreadable.isUndefined()) {
return spreadable.toBoolean(state);
}
// Return IsArray(O).
return isArray(state);
}
Object* Object::createBuiltinObjectPrototype(ExecutionState& state)
{
Object* obj = new PrototypeObject(state, PrototypeObject::__ForGlobalBuiltin__);
obj->markThisObjectDontNeedStructureTransitionTable();
return obj;
}
class FunctionPrototypeObject : public PrototypeObject {
public:
explicit FunctionPrototypeObject(ExecutionState& state, Object* proto, size_t defaultSpace)
: PrototypeObject(state, proto, defaultSpace)
{
}
virtual bool isFunctionPrototypeObject() const override
{
return true;
}
};
Object* Object::createFunctionPrototypeObject(ExecutionState& state, FunctionObject* function)
{
auto ctx = function->codeBlock()->context();
Object* obj = new FunctionPrototypeObject(state, ctx->globalObject()->objectPrototype()->asObject(), ESCARGOT_OBJECT_BUILTIN_PROPERTY_NUMBER + 1);
obj->m_structure = ctx->defaultStructureForFunctionPrototypeObject();
obj->m_values[0] = Value(function);
return obj;
}
void Object::setGlobalIntrinsicObject(ExecutionState& state, bool isPrototype)
{
// For initialization of GlobalObject's intrinsic objects
// These objects have fixed properties, so transition table is not used for memory optimization
ASSERT(m_prototype);
ASSERT(!structure()->hasIndexPropertyName());
markThisObjectDontNeedStructureTransitionTable();
if (isPrototype) {
markAsPrototypeObject(state);
}
}
String* Object::constructorName(ExecutionState& state)
{
Optional<FunctionObject*> ctor;
if (hasRareData() && rareData()->m_hasExtendedExtraData && ensureObjectExtendedExtraData()->m_meaningfulConstructor) {
ctor = ensureObjectExtendedExtraData()->m_meaningfulConstructor;
} else {
Optional<Object*> object = getPrototypeObject(state);
if (object) {
Value c = object->getOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().constructor)).value(state, object.value());
if (c.isFunction()) {
ctor = c.asFunction();
}
}
}
Value name;
if (ctor) {
if (ctor->isScriptClassConstructorFunctionObject()) {
name = ctor->getOwnProperty(state, state.context()->staticStrings().name).value(state, ctor.value());
} else {
name = ctor->codeBlock()->functionName().string();
}
}
if (name.isString()) {
return name.asString();
} else {
return state.context()->staticStrings().Object.string();
}
}
bool Object::setPrototype(ExecutionState& state, const Value& proto)
{
// https://www.ecma-international.org/ecma-262/6.0/#sec-ordinary-object-internal-methods-and-internal-slots-setprototypeof-v
// [[SetPrototypeOf]] (V)
// 1. Assert: Either Type(V) is Object or Type(V) is Null.
ASSERT(proto.isObject() || proto.isNull());
// 3. Let current be the value of the [[Prototype]] internal slot of O.
// 4. If SameValue(V, current), return true.
Value lastPrototype = this->getPrototype(state);
if (proto == lastPrototype) {
return true;
}
// 2. Let extensible be the value of the [[Extensible]] internal slot of O.
// 5. If extensible is false, return false.
if (!isExtensible(state)) {
return false;
}
// 6. Let p be V.
Value p = proto;
// 7. Let done be false.
bool done = false;
// 8. Repeat while done is false,
while (done == false) {
if (p.isNull()) { // If p is null, let done be true.
done = true;
} else if (p.isObject() && p.asObject() == this) { // Else, if SameValue(p, O) is true, return false.
return false;
} else { // Else,
// i. If the [[GetPrototypeOf]] internal method of p is not the ordinary object internal method defined in 9.1.1, let done be true.
if (UNLIKELY(!p.isObject() || !p.asObject()->isOrdinary())) {
done = true;
} else { // ii. Else, let p be the value of p’s [[Prototype]] internal slot.
p = p.asObject()->getPrototype(state);
}
}
}
//9. Set the value of the [[Prototype]] internal slot of O to V.
Object* o = nullptr;
if (LIKELY(proto.isObject())) {
o = proto.asObject();
o->markAsPrototypeObject(state);
}
if (hasRareData()) {
rareData()->m_prototype = o;
} else {
m_prototype = o;
}
bool hadPrototypeAsObject = lastPrototype.isObject();
if (UNLIKELY(
// if new prototype is null and last prototype was object
(!o && hadPrototypeAsObject)
||
// if last prototype is function's prototype
(hadPrototypeAsObject && lastPrototype.asObject()->isFunctionPrototypeObject())
||
// if last prototype is class's prototype
(hadPrototypeAsObject && lastPrototype.asObject()->isScriptClassConstructorPrototypeObject()))) {
if (!hasRareData() || !rareData()->m_hasExtendedExtraData || !rareData()->m_extendedExtraData->m_meaningfulConstructor.hasValue()) {
if (lastPrototype.asObject()->isScriptClassConstructorPrototypeObject()) {
ensureObjectExtendedExtraData()->m_meaningfulConstructor = lastPrototype.asObject()->asScriptClassConstructorPrototypeObject()->constructor();
} else {
auto ctor = lastPrototype.asObject()->readConstructorSlotWithoutState();
if (ctor && ctor.value().isFunction()) {
ensureObjectExtendedExtraData()->m_meaningfulConstructor = ctor.value().asFunction();
}
}
}
}
// 10. Return true.
return true;
}
void Object::markAsPrototypeObject(ExecutionState& state)
{
if (hasVTag(g_objectTag)) {
writeVTag(g_prototypeObjectTag);
} else {
ensureRareData()->m_isEverSetAsPrototypeObject = true;
}
if (UNLIKELY(!state.context()->vmInstance()->didSomePrototypeObjectDefineIndexedProperty() && (structure()->hasIndexPropertyName() || isProxyObject()))) {
state.context()->vmInstance()->somePrototypeObjectDefineIndexedProperty(state);
}
}
ObjectGetResult Object::getOwnProperty(ExecutionState& state, const ObjectPropertyName& propertyName)
{
if (propertyName.isUIntType() && !m_structure->hasIndexPropertyName()) {
return ObjectGetResult();
}
ObjectStructurePropertyName P = propertyName.toObjectStructurePropertyName(state);
auto findResult = m_structure->findProperty(P);
if (LIKELY(findResult.first != SIZE_MAX)) {
const ObjectStructureItem* item = findResult.second.value();
const auto& desc = item->m_descriptor;
auto presentAttributes = desc.descriptorData().presentAttributes();
if (desc.isDataProperty()) {
if (LIKELY(!desc.isNativeAccessorProperty())) {
return ObjectGetResult(m_values[findResult.first], presentAttributes & ObjectStructurePropertyDescriptor::WritablePresent, presentAttributes & ObjectStructurePropertyDescriptor::EnumerablePresent, presentAttributes & ObjectStructurePropertyDescriptor::ConfigurablePresent);
} else {
ObjectPropertyNativeGetterSetterData* data = desc.nativeGetterSetterData();
return ObjectGetResult(data, this, m_values[findResult.first], presentAttributes & ObjectStructurePropertyDescriptor::WritablePresent, presentAttributes & ObjectStructurePropertyDescriptor::EnumerablePresent, presentAttributes & ObjectStructurePropertyDescriptor::ConfigurablePresent);
}
} else {
const Value& v = m_values[findResult.first];
ASSERT(v.isPointerValue() && v.asPointerValue()->isJSGetterSetter());
return ObjectGetResult(v.asPointerValue()->asJSGetterSetter(), presentAttributes & ObjectStructurePropertyDescriptor::EnumerablePresent, presentAttributes & ObjectStructurePropertyDescriptor::ConfigurablePresent);
}
}
return ObjectGetResult();
}
bool Object::defineOwnPropertyMethod(ExecutionState& state, const ObjectPropertyName& P, const ObjectPropertyDescriptor& desc)
{
// TODO Return true, if every field in Desc is absent.
// TODO Return true, if every field in Desc also occurs in current and the value of every field in Desc is the same value as the corresponding field in current when compared using the SameValue algorithm (9.12).
ObjectStructurePropertyName propertyName = P.toObjectStructurePropertyName(state);
auto findResult = m_structure->findProperty(propertyName);
if (findResult.first == SIZE_MAX) {
// 3. If current is undefined and extensible is false, then Reject.
if (UNLIKELY(!isExtensible(state))) {
return false;
}
auto structureBefore = m_structure;
m_structure = m_structure->addProperty(propertyName, desc.toObjectStructurePropertyDescriptor());
ASSERT(structureBefore != m_structure);
if (LIKELY(desc.isDataProperty())) {
const Value& val = desc.isValuePresent() ? desc.value() : Value();
m_values.pushBack(val, m_structure->propertyCount());
} else {
m_values.pushBack(Value(new JSGetterSetter(desc.getterSetter())), m_structure->propertyCount());
}
// ASSERT(m_values.size() == m_structure->propertyCount());
return true;
} else {
size_t idx = findResult.first;
const ObjectStructureItem* item = findResult.second.value();
auto current = item->m_descriptor;
// If the [[Configurable]] field of current is false then
if (!current.isConfigurable()) {
// Reject, if the [[Configurable]] field of Desc is true.
if (desc.isConfigurable()) {
return false;
}
// Reject, if the [[Enumerable]] field of Desc is present and the [[Enumerable]] fields of current and Desc are the Boolean negation of each other.
if (desc.isEnumerablePresent() && desc.isEnumerable() != current.isEnumerable()) {
return false;
}
}
bool shouldDelete = false;
Value v = current.isNativeAccessorProperty() ? this->get(state, ObjectPropertyName(state, propertyName)).value(state, this) : Value(m_values[idx]);
ObjectPropertyDescriptor newDesc = ObjectPropertyDescriptor::fromObjectStructurePropertyDescriptor(current, v);
// If IsGenericDescriptor(Desc) is true, then
if (desc.isGenericDescriptor()) {
// no further validation is required.
}
// If IsDataDescriptor(current) and IsDataDescriptor(Desc) have different results, then
else if (current.isDataProperty() != desc.isDataDescriptor()) {
// Reject, if the [[Configurable]] field of current is false.
if (!current.isConfigurable()) {
return false;
}
shouldDelete = true;
int f = current.isConfigurable() ? ObjectPropertyDescriptor::ConfigurablePresent : ObjectPropertyDescriptor::NonConfigurablePresent;
f |= current.isEnumerable() ? ObjectPropertyDescriptor::EnumerablePresent : ObjectPropertyDescriptor::NonEnumerablePresent;
// If IsDataDescriptor(current) is true, then
if (current.isDataProperty()) {
// Convert the property named P of object O from a data property to an accessor property.
// Preserve the existing values of the converted property’s [[Configurable]] and [[Enumerable]] attributes
// and set the rest of the property’s attributes to their default values.
newDesc = ObjectPropertyDescriptor(desc.getterSetter(), (ObjectPropertyDescriptor::PresentAttribute)f);
} else {
// Else,
// Convert the property named P of object O from an accessor property to a data property.
// Preserve the existing values of the converted property's [[Configurable]] and [[Enumerable]] attributes
// and set the rest of the property's attributes to their default values.
newDesc = ObjectPropertyDescriptor(desc.isValuePresent() ? desc.value() : Value(), (ObjectPropertyDescriptor::PresentAttribute)f);
}
// Else, if IsDataDescriptor(current) and IsDataDescriptor(Desc) are both true, then
} else if (item->m_descriptor.isDataProperty() && desc.isDataDescriptor()) {
// If the [[Configurable]] field of current is false, then
if (!item->m_descriptor.isConfigurable()) {
// Reject, if the [[Writable]] field of current is false and the [[Writable]] field of Desc is true.
if (!item->m_descriptor.isWritable() && desc.isWritable()) {
return false;
}
// If the [[Writable]] field of current is false, then
// Reject, if the [[Value]] field of Desc is present and SameValue(Desc.[[Value]], current.[[Value]]) is false.
if (!item->m_descriptor.isWritable() && desc.isValuePresent() && !desc.value().equalsToByTheSameValueAlgorithm(getOwnDataPropertyUtilForObject(state, idx, this))) {
return false;
}
}
}
// Else, the [[Configurable]] field of current is true, so any change is acceptable.
else {
// Else, IsAccessorDescriptor(current) and IsAccessorDescriptor(Desc) are both true so,
ASSERT(!current.isDataProperty() && !desc.isDataDescriptor());
// If the [[Configurable]] field of current is false, then
if (!current.isConfigurable()) {
JSGetterSetter* currgs = Value(m_values[idx]).asPointerValue()->asJSGetterSetter();
// Reject, if the [[Set]] field of Desc is present and SameValue(Desc.[[Set]], current.[[Set]]) is false.
if (desc.getterSetter().hasSetter() && (desc.getterSetter().setter() != (currgs->hasSetter() ? currgs->setter() : Value()))) {
return false;
}
// Reject, if the [[Get]] field of Desc is present and SameValue(Desc.[[Get]], current.[[Get]]) is false.
if (desc.getterSetter().hasGetter() && (desc.getterSetter().getter() != (currgs->hasGetter() ? currgs->getter() : Value()))) {
return false;
}
}
}
// For each attribute field of Desc that is present, set the correspondingly named attribute of the property named P of object O to the value of the field.
if (newDesc.isDataDescriptor()) {
if (desc.isValuePresent()) {
newDesc.setValue(desc.value());
} else if (!newDesc.isValuePresent()) {
newDesc.setValue(Value());
}
if (desc.isWritablePresent()) {
newDesc.setWritable(desc.isWritable());
}
} else {
if (desc.isAccessorDescriptor()) {
if (desc.hasJSGetter()) {
newDesc.m_getterSetter.m_getter = desc.getterSetter().getter();
}
if (desc.hasJSSetter()) {
newDesc.m_getterSetter.m_setter = desc.getterSetter().setter();
}
}
}
if (desc.isConfigurablePresent()) {
newDesc.setConfigurable(desc.isConfigurable());
}
if (desc.isEnumerablePresent()) {
newDesc.setEnumerable(desc.isEnumerable());
}
if (!shouldDelete) {
if (newDesc.isDataDescriptor() && newDesc.isWritablePresent() && newDesc.isWritable() != current.isWritable()) {
shouldDelete = true;
} else if (newDesc.isEnumerablePresent() && newDesc.isEnumerable() != current.isEnumerable()) {
shouldDelete = true;
} else if (newDesc.isConfigurablePresent() && newDesc.isConfigurable() != current.isConfigurable()) {
shouldDelete = true;
}
}
if (!shouldDelete) {
if (newDesc.isDataDescriptor()) {
if (desc.isValuePresent()) {
return setOwnDataPropertyUtilForObjectInner(state, findResult.first, *item, newDesc.value(), Value(this));
}
} else {
m_values[idx] = Value(new JSGetterSetter(newDesc.getterSetter()));
}
} else {
auto oldDesc = findResult.second.value();
if (newDesc.isDataDescriptor() && oldDesc->m_descriptor.isNativeAccessorProperty()) {
auto newNative = new ObjectPropertyNativeGetterSetterData(newDesc.isWritable(), newDesc.isEnumerable(), newDesc.isConfigurable(),
oldDesc->m_descriptor.nativeGetterSetterData()->m_getter, oldDesc->m_descriptor.nativeGetterSetterData()->m_setter);
m_structure = m_structure->replacePropertyDescriptor(idx, ObjectStructurePropertyDescriptor::createDataButHasNativeGetterSetterDescriptor(newNative));
} else {
m_structure = m_structure->replacePropertyDescriptor(idx, newDesc.toObjectStructurePropertyDescriptor());
}
if (newDesc.isDataDescriptor()) {
return setOwnDataPropertyUtilForObjectInner(state, idx, m_structure->readProperty(idx), newDesc.value(), Value(this));
} else {
m_values[idx] = Value(new JSGetterSetter(newDesc.getterSetter()));
}
}
return true;
}
}
bool Object::defineOwnProperty(ExecutionState& state, const ObjectPropertyName& P, const ObjectPropertyDescriptor& desc)
{
// this method should be called for pure Object,
// not for derived Objects like PrototypeObject
ASSERT(hasVTag(g_objectTag));
ASSERT(!isEverSetAsPrototypeObject());
return defineOwnPropertyMethod(state, P, desc);
}
void Object::addNonExistentProperty(ExecutionState& state, const ObjectPropertyName& P, const ObjectPropertyDescriptor& desc)
{
ASSERT(isOrdinary());
ASSERT(!hasOwnProperty(state, P));
ASSERT(isExtensible(state));
ObjectStructurePropertyName propertyName = P.toObjectStructurePropertyName(state);
m_structure = m_structure->addProperty(propertyName, desc.toObjectStructurePropertyDescriptor());
if (LIKELY(desc.isDataProperty())) {
const Value& val = desc.isValuePresent() ? desc.value() : Value();
m_values.pushBack(val, m_structure->propertyCount());
} else {
m_values.pushBack(Value(new JSGetterSetter(desc.getterSetter())), m_structure->propertyCount());
}
}
bool Object::deleteOwnProperty(ExecutionState& state, const ObjectPropertyName& P)
{
auto result = getOwnProperty(state, P);
if (result.hasValue() && result.isConfigurable()) {
deleteOwnProperty(state, m_structure->findProperty(P.toObjectStructurePropertyName(state)).first);
return true;
} else if (result.hasValue() && !result.isConfigurable()) {
return false;
}
return true;
}
void Object::enumeration(ExecutionState& state, bool (*callback)(ExecutionState& state, Object* self, const ObjectPropertyName&, const ObjectStructurePropertyDescriptor& desc, void* data), void* data, bool shouldSkipSymbolKey)
{
const ObjectStructureItem* propertiesVector;
propertiesVector = m_structure->properties();
size_t cnt = m_structure->propertyCount();
bool inTransitionMode = m_structure->inTransitionMode();
if (!inTransitionMode) {
auto newData = ALLOCA(sizeof(ObjectStructureItem) * cnt, ObjectStructureItem, state);
memcpy(newData, propertiesVector, sizeof(ObjectStructureItem) * cnt);
propertiesVector = newData;
}
for (size_t i = 0; i < cnt; i++) {
const ObjectStructureItem& item = propertiesVector[i];
if (shouldSkipSymbolKey && item.m_propertyName.isSymbol()) {
continue;
}
if (!callback(state, this, ObjectPropertyName(state, item.m_propertyName), item.m_descriptor, data)) {
break;
}
}
}
ObjectHasPropertyResult Object::hasProperty(ExecutionState& state, const ObjectPropertyName& propertyName)
{
// https://www.ecma-international.org/ecma-262/6.0/#sec-ordinary-object-internal-methods-and-internal-slots-hasproperty-p
// 1. Assert: IsPropertyKey(P) is true.
// 2. Let hasOwn be OrdinaryGetOwnProperty(O, P).
auto hasOwn = getOwnProperty(state, propertyName);
// 3. If hasOwn is not undefined, return true.
if (hasOwn.hasValue()) {
return ObjectHasPropertyResult(hasOwn);
}
// 4. Let parent be O.[[GetPrototypeOf]]().
// 5. ReturnIfAbrupt(parent).
auto parent = getPrototypeObject(state);
// 6. If parent is not null, then
if (parent) {
// a. Return parent.[[HasProperty]](P).
return parent->hasProperty(state, propertyName);
}
// 7. Return false.
return ObjectHasPropertyResult();
}
ObjectHasPropertyResult Object::hasIndexedProperty(ExecutionState& state, const Value& propertyName)
{
return hasProperty(state, ObjectPropertyName(state, propertyName));
}
typedef std::pair<Value::ValueIndex, ObjectStructurePropertyDescriptor> IndexItem;
struct CompareIndexItem {
bool operator()(const IndexItem& a, const IndexItem& b) const
{
return a.first < b.first;
}
};
template <typename ResultType, typename ResultBinder>
static ResultType objectOwnPropertyKeys(ExecutionState& state, Object* self)
{