#include "config.h"

#include "Nodes.h"

#include "NodeConstructors.h"

#include "AbstractModuleRecord.h"

#include "BuiltinNames.h"

#include "BytecodeGenerator.h"

#include "BytecodeGeneratorBaseInlines.h"

#include "JSArrayIterator.h"

#include "JSAsyncDisposableStack.h"

#include "JSAsyncFromSyncIterator.h"

#include "JSAsyncGenerator.h"

#include "JSCellButterfly.h"

#include "JSCInlines.h"

#include "JSDisposableStack.h"

#include "JSGenerator.h"

#include "JSIteratorHelper.h"

#include "JSMapIterator.h"

#include "JSPromise.h"

#include "JSPromiseReaction.h"

#include "JSSetIterator.h"

#include "JSStringIterator.h"

#include "JSWrapForValidIterator.h"

#include "LabelScope.h"

#include "LinkTimeConstant.h"

#include "ModuleScopeData.h"

#include "StackAlignment.h"

#include "UnlinkedMetadataTableInlines.h"

#include "YarrFlags.h"

#include <wtf/Assertions.h>

#include <wtf/MathExtras.h>

#include <wtf/text/StringBuilder.h>

namespace JSC {

void ExpressionNode::emitBytecodeInConditionContext(BytecodeGenerator& generator, Label& trueTarget, Label& falseTarget, FallThroughMode fallThroughMode)

}

RegisterID* ThrowableExpressionData::emitThrowReferenceError(BytecodeGenerator& generator, ASCIILiteral message, RegisterID* dst)

{

generator.emitExpressionInfo(divot(), divotStart(), divotEnd());

generator.emitThrowReferenceError(message);

if (dst)

return dst;

return generator.newTemporary();

}

void ConstantNode::emitBytecodeInConditionContext(BytecodeGenerator& generator, Label& trueTarget, Label& falseTarget, FallThroughMode fallThroughMode)

}

RegisterID* ConstantNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

if (dst == generator.ignoredResult())

return nullptr;

JSValue constant = jsValue(generator);

if (!constant) [[unlikely]] {

// This can happen if we try to parse a string or BigInt so enormous that we OOM.

return generator.emitThrowExpressionTooDeepException();

}

return generator.emitLoad(dst, constant);

}

JSValue StringNode::jsValue(BytecodeGenerator& generator) const

{

return generator.addStringConstant(m_value);

}

JSValue BigIntNode::jsValue(BytecodeGenerator& generator) const

{

return generator.addBigIntConstant(m_value, m_radix, m_sign);

}

JSValue NumberNode::jsValue(BytecodeGenerator&) const { return jsNumber(m_value); }

RegisterID* NumberNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

if (dst == generator.ignoredResult())

return nullptr;

return generator.emitLoad(dst, jsValue(generator), isIntegerNode() ? SourceCodeRepresentation::Integer : SourceCodeRepresentation::Double);

}

RegisterID* RegExpNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

if (dst == generator.ignoredResult())

return nullptr;

auto flags = Yarr::parseFlags(m_flags.string());

ASSERT(flags);

RegExp* regExp = RegExp::create(generator.vm(), m_pattern.string(), flags.value());

if (regExp->isValid())

return generator.emitNewRegExp(generator.finalDestination(dst), regExp);

auto& message = generator.parserArena().identifierArena().makeIdentifier(generator.vm(), regExp->errorMessage().span8());

generator.emitThrowStaticError(ErrorTypeWithExtension::SyntaxError, message);

return generator.emitLoad(generator.finalDestination(dst), jsUndefined());

}

RegisterID* ThisNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

generator.ensureThis();

if (dst == generator.ignoredResult())

return nullptr;

RegisterID* result = generator.move(dst, generator.thisRegister());

static const unsigned thisLength = strlen("this");

generator.emitProfileType(generator.thisRegister(), position(), position() + thisLength);

return result;

}

static RegisterID* emitHomeObjectForCallee(BytecodeGenerator& generator)

{

if ((generator.isDerivedClassContext() || generator.isDerivedConstructorContext()) && generator.parseMode() != SourceParseMode::ClassFieldInitializerMode) {

RegisterID* derivedConstructor = generator.emitLoadDerivedConstructorFromArrowFunctionLexicalEnvironment();

return generator.emitGetById(generator.newTemporary(), derivedConstructor, generator.propertyNames().builtinNames().homeObjectPrivateName());

}

RegisterID callee;

callee.setIndex(CallFrameSlot::callee);

return generator.emitGetById(generator.newTemporary(), &callee, generator.propertyNames().builtinNames().homeObjectPrivateName());

}

static RegisterID* emitSuperBaseForCallee(BytecodeGenerator& generator)

{

RefPtr<RegisterID> homeObject = emitHomeObjectForCallee(generator);

return generator.emitGetPrototypeOf(generator.newTemporary(), homeObject.get());

}

static RegisterID* emitGetSuperFunctionForConstruct(BytecodeGenerator& generator)

{

if (generator.isDerivedConstructorContext())

return generator.emitGetPrototypeOf(generator.newTemporary(), generator.emitLoadDerivedConstructorFromArrowFunctionLexicalEnvironment());

RegisterID callee;

callee.setIndex(CallFrameSlot::callee);

return generator.emitGetPrototypeOf(generator.newTemporary(), &callee);

}

RegisterID* SuperNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

RegisterID* result = emitSuperBaseForCallee(generator);

return generator.move(generator.finalDestination(dst), result);

}

RegisterID* ImportNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

RefPtr<RegisterID> importModule = generator.moveLinkTimeConstant(nullptr, LinkTimeConstant::importModule);

unsigned argumentCount = m_deferred ? 3 : (m_option ? 2 : 1);

CallArguments arguments(generator, nullptr, argumentCount);

generator.emitLoad(arguments.thisRegister(), jsUndefined());

generator.emitNode(arguments.argumentRegister(0), m_expr);

if (m_option)

generator.emitNode(arguments.argumentRegister(1), m_option);

else if (m_deferred)

generator.emitLoad(arguments.argumentRegister(1), jsUndefined());

if (m_deferred)

generator.emitLoad(arguments.argumentRegister(2), jsBoolean(true));

return generator.emitCall(generator.finalDestination(dst, importModule.get()), importModule.get(), NoExpectedFunction, arguments, divot(), divotStart(), divotEnd(), DebuggableCall::No);

}

RegisterID* NewTargetNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

if (dst == generator.ignoredResult())

return nullptr;

return generator.move(dst, generator.newTarget());

}

RegisterID* ImportMetaNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

return generator.emitNode(dst, m_expr);

}

bool ResolveNode::isPure(BytecodeGenerator& generator) const

{

return generator.variable(m_ident).offset().isStack();

}

bool ResolveNode::getFromScopeCanThrow(BytecodeGenerator& generator) const

}

RegisterID* ResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

Variable var = generator.variable(m_ident);

JSTextPosition divot = m_start + m_ident.length();

if (RegisterID* local = var.local()) {

generator.emitExpressionInfo(divot, m_start, divot);

generator.emitTDZCheckIfNecessary(var, local, nullptr);

if (dst == generator.ignoredResult())

return nullptr;

generator.emitProfileType(local, var, m_position, m_position + m_ident.length());

return generator.move(dst, local);

}

generator.emitExpressionInfo(divot, m_start, divot);

RefPtr<RegisterID> scope = generator.emitResolveScope(dst, var);

RegisterID* finalDest = generator.finalDestination(dst);

if (!generator.needsTDZCheck(var))

generator.emitGetFromScope(finalDest, scope.get(), var, ThrowIfNotFound);

else {

RefPtr<RegisterID> uncheckedResult = generator.newTemporary();

generator.emitGetFromScope(uncheckedResult.get(), scope.get(), var, ThrowIfNotFound);

generator.emitTDZCheck(uncheckedResult.get());

generator.move(finalDest, uncheckedResult.get());

}

generator.emitProfileType(finalDest, var, m_position, m_position + m_ident.length());

return finalDest;

}

RegisterID* TemplateStringNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

if (dst == generator.ignoredResult())

return nullptr;

ASSERT(cooked());

return generator.emitLoad(dst, JSValue(generator.addStringConstant(*cooked())));

}

RegisterID* TemplateLiteralNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

if (!m_templateExpressions) {

TemplateStringNode* templateString = m_templateStrings->value();

ASSERT_WITH_MESSAGE(!m_templateStrings->next(), "Only one template element exists because there's no expression in a given template literal.");

return generator.emitNode(dst, templateString);

}

Vector<RefPtr<RegisterID>, 16> temporaryRegisters;

TemplateStringListNode* templateString = m_templateStrings;

TemplateExpressionListNode* templateExpression = m_templateExpressions;

for (; templateExpression; templateExpression = templateExpression->next(), templateString = templateString->next()) {

// Evaluate TemplateString.

ASSERT(templateString->value()->cooked());

if (!templateString->value()->cooked()->isEmpty()) {

temporaryRegisters.append(generator.newTemporary());

generator.emitNode(temporaryRegisters.last().get(), templateString->value());

}

// Evaluate Expression.

temporaryRegisters.append(generator.newTemporary());

generator.emitNode(temporaryRegisters.last().get(), templateExpression->value());

generator.emitToString(temporaryRegisters.last().get(), temporaryRegisters.last().get());

}

// Evaluate tail TemplateString.

ASSERT(templateString->value()->cooked());

if (!templateString->value()->cooked()->isEmpty()) {

temporaryRegisters.append(generator.newTemporary());

generator.emitNode(temporaryRegisters.last().get(), templateString->value());

}

if (temporaryRegisters.size() == 1)

return generator.move(generator.finalDestination(dst, temporaryRegisters[0].get()), temporaryRegisters[0].get());

return generator.emitStrcat(generator.finalDestination(dst, temporaryRegisters[0].get()), temporaryRegisters[0].get(), temporaryRegisters.size());

}

RegisterID* TaggedTemplateNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

ExpectedFunction expectedFunction = NoExpectedFunction;

RefPtr<RegisterID> tag = nullptr;

RefPtr<RegisterID> base = nullptr;

if (!m_tag->isLocation()) {

tag = generator.newTemporary();

tag = generator.emitNode(tag.get(), m_tag);

} else if (m_tag->isResolveNode()) {

ResolveNode* resolve = static_cast<ResolveNode*>(m_tag);

const Identifier& identifier = resolve->identifier();

expectedFunction = generator.expectedFunctionForIdentifier(identifier);

Variable var = generator.variable(identifier);

if (RegisterID* local = var.local()) {

generator.emitTDZCheckIfNecessary(var, local, nullptr);

tag = generator.move(generator.newTemporary(), local);

} else {

tag = generator.newTemporary();

base = generator.newTemporary();

JSTextPosition newDivot = divotStart() + identifier.length();

generator.emitExpressionInfo(newDivot, divotStart(), newDivot);

generator.move(base.get(), generator.emitResolveScope(base.get(), var));

generator.emitGetFromScope(tag.get(), base.get(), var, ThrowIfNotFound);

generator.emitTDZCheckIfNecessary(var, tag.get(), nullptr);

}

} else if (m_tag->isBracketAccessorNode()) {

BracketAccessorNode* bracket = static_cast<BracketAccessorNode*>(m_tag);

base = generator.newTemporary();

base = generator.emitNode(base.get(), bracket->base());

RefPtr<RegisterID> property = generator.emitNodeForProperty(bracket->subscript());

if (bracket->base()->isSuperNode()) {

RefPtr<RegisterID> thisValue = generator.ensureThis();

tag = generator.emitGetByVal(generator.newTemporary(), base.get(), thisValue.get(), property.get());

} else

tag = generator.emitGetByVal(generator.newTemporary(), base.get(), property.get());

} else {

ASSERT(m_tag->isDotAccessorNode());

DotAccessorNode* dot = static_cast<DotAccessorNode*>(m_tag);

tag = generator.newTemporary();

base = generator.newTemporary();

base = generator.emitNode(base.get(), dot->base());

tag = dot->emitGetPropertyValue(generator, tag.get(), base.get());

}

RefPtr<RegisterID> templateObject = generator.emitGetTemplateObject(nullptr, this);

unsigned expressionsCount = 0;

for (TemplateExpressionListNode* templateExpression = m_templateLiteral->templateExpressions(); templateExpression; templateExpression = templateExpression->next())

++expressionsCount;

CallArguments callArguments(generator, nullptr, 1 + expressionsCount);

if (base)

generator.move(callArguments.thisRegister(), base.get());

else

generator.emitLoad(callArguments.thisRegister(), jsUndefined());

unsigned argumentIndex = 0;

generator.move(callArguments.argumentRegister(argumentIndex++), templateObject.get());

for (TemplateExpressionListNode* templateExpression = m_templateLiteral->templateExpressions(); templateExpression; templateExpression = templateExpression->next())

generator.emitNode(callArguments.argumentRegister(argumentIndex++), templateExpression->value());

return generator.emitCallInTailPosition(generator.finalDestination(dst, tag.get()), tag.get(), expectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);

}

RegisterID* ArrayNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

bool hadVariableExpression = false;

bool allDenseStrings = true;

unsigned length = 0;

IndexingType recommendedIndexingType = ArrayWithUndecided;

ElementNode* firstPutElement;

for (firstPutElement = m_element; firstPutElement; firstPutElement = firstPutElement->next()) {

if (firstPutElement->elision() || firstPutElement->value()->isSpreadExpression())

break;

if (!firstPutElement->value()->isConstant())

hadVariableExpression = true;

else {

JSValue constant = static_cast<ConstantNode*>(firstPutElement->value())->jsValue(generator);

if (!constant) [[unlikely]]

hadVariableExpression = true;

else {

recommendedIndexingType = leastUpperBoundOfIndexingTypeAndValue(recommendedIndexingType, constant);

if (!constant.isString())

allDenseStrings = false;

else if (auto* impl = asString(constant)->tryGetValueImpl(); !impl || !impl->isAtom())

allDenseStrings = false;

}

}

++length;

}

if (hadVariableExpression)

allDenseStrings = false;

auto newArray = [&](RegisterID* dst, ElementNode* elements, unsigned length) {

if (length && !hadVariableExpression) {

VM& vm = generator.vm();

recommendedIndexingType |= CopyOnWrite;

ASSERT(vm.heap.isDeferred()); // We run bytecode generator under a DeferGC. If we stopped doing that, we'd need to put a DeferGC here as we filled in these slots.

Structure* cellButterflyStructure = allDenseStrings ? vm.cellButterflyOnlyAtomStringsStructure.get() : vm.cellButterflyStructure(recommendedIndexingType);

auto* array = JSCellButterfly::tryCreate(generator.vm(), cellButterflyStructure, length);

RELEASE_ASSERT(array);

unsigned index = 0;

for (ElementNode* element = elements; index < length; element = element->next()) {

ASSERT(element->value()->isConstant());

JSValue constant = static_cast<ConstantNode*>(element->value())->jsValue(generator);

ASSERT(constant);

if (allDenseStrings) {

JSString* string = asString(constant);

StringImpl* stringImpl = const_cast<StringImpl*>(string->getValueImpl());

constant = vm.atomStringToJSStringMap.ensureValue(stringImpl, [&] { return string; });

}

array->setIndex(generator.vm(), index++, constant);

}

return generator.emitNewArrayBuffer(dst, array, recommendedIndexingType);

}

return generator.emitNewArray(dst, elements, length, recommendedIndexingType);

};

if (!firstPutElement && !m_elision)

return newArray(generator.finalDestination(dst), m_element, length);

allDenseStrings = false;

if (firstPutElement && firstPutElement->value()->isSpreadExpression()) {

bool hasElision = m_elision;

if (!hasElision) {

for (ElementNode* node = firstPutElement; node; node = node->next()) {

if (node->elision()) {

hasElision = true;

break;

}

}

}

if (!hasElision)

return generator.emitNewArrayWithSpread(generator.finalDestination(dst), m_element);

}

RefPtr<RegisterID> array = newArray(generator.tempDestination(dst), m_element, length);

ElementNode* n = firstPutElement;

for (; n; n = n->next()) {

if (n->value()->isSpreadExpression())

goto handleSpread;

RefPtr<RegisterID> value = generator.emitNode(n->value());

length += n->elision();

RefPtr<RegisterID> index = generator.emitLoad(nullptr, jsNumber(length++));

generator.emitDirectPutByVal(array.get(), index.get(), value.get());

}

if (m_elision) {

RegisterID* value = generator.emitLoad(nullptr, jsNumber(m_elision + length));

generator.emitPutById(array.get(), generator.propertyNames().length, value);

}

return generator.move(dst, array.get());

handleSpread:

RefPtr<RegisterID> index = generator.emitLoad(generator.newTemporary(), jsNumber(length));

auto spreader = scopedLambda<void(BytecodeGenerator&, RegisterID*)>([array, index](BytecodeGenerator& generator, RegisterID* value)

{

generator.emitDirectPutByVal(array.get(), index.get(), value);

generator.emitInc(index.get());

});

for (; n; n = n->next()) {

if (n->elision())

generator.emitBinaryOp<OpAdd>(index.get(), index.get(), generator.emitLoad(nullptr, jsNumber(n->elision())), OperandTypes(ResultType::numberTypeIsInt32(), ResultType::numberTypeIsInt32()));

if (n->value()->isSpreadExpression()) {

SpreadExpressionNode* spread = static_cast<SpreadExpressionNode*>(n->value());

generator.emitEnumeration(spread, spread->expression(), spreader);

} else {

generator.emitDirectPutByVal(array.get(), index.get(), generator.emitNode(n->value()));

generator.emitInc(index.get());

}

}

if (m_elision) {

generator.emitBinaryOp<OpAdd>(index.get(), index.get(), generator.emitLoad(nullptr, jsNumber(m_elision)), OperandTypes(ResultType::numberTypeIsInt32(), ResultType::numberTypeIsInt32()));

generator.emitPutById(array.get(), generator.propertyNames().length, index.get());

}

return generator.move(dst, array.get());

}

bool ArrayNode::isSimpleArray() const

}

ArgumentListNode* ArrayNode::toArgumentList(ParserArena& parserArena, int lineNumber, int startPosition) const

{

ASSERT(!m_elision);

ElementNode* ptr = m_element;

if (!ptr)

return nullptr;

JSTokenLocation location;

location.line = lineNumber;

location.startOffset = startPosition;

ArgumentListNode* head = new (parserArena) ArgumentListNode(location, ptr->value());

ArgumentListNode* tail = head;

ptr = ptr->next();

for (; ptr; ptr = ptr->next()) {

ASSERT(!ptr->elision());

tail = new (parserArena) ArgumentListNode(location, tail, ptr->value());

}

return head;

}

RegisterID* ObjectLiteralNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)

{

if (!m_list) {

if (dst == generator.ignoredResult())

return nullptr;

return generator.emitNewObject(generator.finalDestination(dst));

}

auto* propertyList = m_list;

RefPtr<RegisterID> newObject;

if (propertyList->m_node->m_type & PropertyNode::Spread) {

// Only one element and it is spread.

if (!propertyList->m_next) {

RefPtr<RegisterID> function = generator.moveLinkTimeConstant(nullptr, LinkTimeConstant::cloneObject);

RefPtr<RegisterID> src = generator.emitNode(static_cast<ObjectSpreadExpressionNode*>(propertyList->m_node->m_assign)->expression());

CallArguments args(generator, nullptr, 0);

generator.move(args.thisRegister(), src.get());

return generator.emitCall(generator.finalDestination(dst, function.get()), function.get(), NoExpectedFunction, args, position(), position(), position(), DebuggableCall::No);

}

bool foundNonConstant = false;

for (auto* p = propertyList->m_next; p; p = p->m_next) {

if (p->m_node->m_type & PropertyNode::Constant)

continue;

if (p->m_node->m_type & PropertyNode::Computed)

continue;

if (p->m_node->m_type & PropertyNode::Spread)

continue;

foundNonConstant = true;

break;

}

// All properties are simple constants, and the first property is spread.

// Let's first clone an object and materialize the rest.

if (!foundNonConstant) {

RefPtr<RegisterID> function = generator.moveLinkTimeConstant(nullptr, LinkTimeConstant::cloneObject);

RefPtr<RegisterID> src = generator.emitNode(static_cast<ObjectSpreadExpressionNode*>(propertyList->m_node->m_assign)->expression());

CallArguments args(generator, nullptr, 0);

generator.move(args.thisRegister(), src.get());

newObject = generator.emitCall(generator.tempDestination(dst), function.get(), NoExpectedFunction, args, position(), position(), position(), DebuggableCall::No);

propertyList = propertyList->m_next;

}

}

if (!newObject)

newObject = generator.emitNewObject(generator.tempDestination(dst));

generator.emitNode(newObject.get(), propertyList);

return generator.move(dst, newObject.get());

}

static inline void emitPutHomeObject(BytecodeGenerator& generator, RegisterID* function, RegisterID* homeObject)

{

generator.emitPutById(function, generator.propertyNames().builtinNames().homeObjectPrivateName(), homeObject);

}

void PropertyListNode::emitDeclarePrivateFieldNames(BytecodeGenerator& generator, RegisterID* scope)

}

static ALWAYS_INLINE bool needsHomeObject(ExpressionNode* node)

}

RegisterID* PropertyListNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dstOrConstructor, RegisterID* prototype, Vector<UnlinkedFunctionExecutable::ClassElementDefinition>* instanceElementDefinitions, Vector<UnlinkedFunctionExecutable::ClassElementDefinition>* staticElementDefinitions)

{

auto makeClassElementDefinition = [](const PropertyListNode* p) {

using Kind = UnlinkedFunctionExecutable::ClassElementDefinition::Kind;

std::optional<JSTextPosition> initializerPosition;

if (ExpressionNode* initializer = p->m_node->m_assign)

initializerPosition = initializer->position();

Kind kind = Kind::FieldWithLiteralPropertyKey;

if (p->m_node->isStaticClassBlock())

kind = Kind::StaticInitializationBlock;

else if (p->m_node->hasComputedName())

kind = Kind::FieldWithComputedPropertyKey;

else if (p->m_node->isPrivate())

kind = Kind::FieldWithPrivatePropertyKey;

return UnlinkedFunctionExecutable::ClassElementDefinition { *p->m_node->name(), p->position(), initializerPosition, kind };

};

using GetterSetterPair = std::pair<PropertyNode*, PropertyNode*>;

using GetterSetterMap = UncheckedKeyHashMap<UniquedStringImpl*, GetterSetterPair, IdentifierRepHash>;

if (hasPrivateAccessors()) {

GetterSetterMap privateAccessorMap;

for (PropertyListNode* propertyList = this; propertyList; propertyList = propertyList->m_next) {

if (!(propertyList->m_node->type() & (PropertyNode::PrivateGetter | PropertyNode::PrivateSetter)))

continue;

// We group private getters and setters to store them in a object

GetterSetterPair pair(propertyList->m_node, static_cast<PropertyNode*>(nullptr));

GetterSetterMap::AddResult result = privateAccessorMap.add(propertyList->m_node->name()->impl(), pair);

auto& resultPair = result.iterator->value;

// If the map already contains an element with node->name(),

// we need to store this node in the second part.

if (!result.isNewEntry)

resultPair.second = propertyList->m_node;

continue;

}

// Then we declare private accessors

for (auto& it : privateAccessorMap) {

// FIXME: Use GetterSetter to store private accessors

// https://bugs.webkit.org/show_bug.cgi?id=221915

RefPtr<RegisterID> getterSetterObj = generator.emitNewObject(generator.newTemporary());

GetterSetterPair pair = it.value;

auto emitPutAccessor = [&] (PropertyNode* propertyNode) {

RegisterID* base = propertyNode->isInstanceClassProperty() ? prototype : dstOrConstructor;

RefPtr<RegisterID> value = generator.emitNode(propertyNode->m_assign);

if (propertyNode->needsSuperBinding())

emitPutHomeObject(generator, value.get(), base);

auto setterOrGetterIdent = propertyNode->m_type & PropertyNode::PrivateGetter

? generator.propertyNames().builtinNames().getPrivateName()

: generator.propertyNames().builtinNames().setPrivateName();

generator.emitDirectPutById(getterSetterObj.get(), setterOrGetterIdent, value.get());

};

if (pair.first)

emitPutAccessor(pair.first);

if (pair.second)

emitPutAccessor(pair.second);

Variable var = generator.variable(*pair.first->name());

generator.emitPutToScope(generator.scopeRegister(), var, getterSetterObj.get(), DoNotThrowIfNotFound, InitializationMode::ConstInitialization);

}

}

PropertyListNode* p = this;

RegisterID* dst = nullptr;

// Fast case: this loop just handles regular value properties.

for (; p && (p->m_node->m_type & PropertyNode::Constant); p = p->m_next) {

dst = p->m_node->isInstanceClassProperty() ? prototype : dstOrConstructor;

if (p->m_node->type() & (PropertyNode::PrivateGetter | PropertyNode::PrivateSetter))

continue;

if (p->isComputedClassField())

emitSaveComputedFieldName(generator, *p->m_node);

if (p->isInstanceClassField() && !(p->m_node->type() & PropertyNode::PrivateMethod)) {

ASSERT(instanceElementDefinitions);

instanceElementDefinitions->append(makeClassElementDefinition(p));

continue;

}

if (p->isStaticClassElement()) {

ASSERT(staticElementDefinitions);

staticElementDefinitions->append(makeClassElementDefinition(p));

continue;

}

emitPutConstantProperty(generator, dst, *p->m_node);

}

// Were there any get/set properties?

if (p) {

// Build a list of getter/setter pairs to try to put them at the same time. If we encounter

// a constant property by the same name as accessor or a computed property or a spread,

// just emit everything as that may override previous values.

bool canOverrideProperties = false;

GetterSetterMap instanceMap;

GetterSetterMap staticMap;

// Build a map, pairing get/set values together.

for (PropertyListNode* q = p; q; q = q->m_next) {

PropertyNode* node = q->m_node;

if (node->m_type & PropertyNode::Computed || node->m_type & PropertyNode::Spread) {

canOverrideProperties = true;

break;

}

GetterSetterMap& map = node->isStaticClassProperty() ? staticMap : instanceMap;

if (node->m_type & PropertyNode::Constant) {

if (map.contains(node->name()->impl())) {

canOverrideProperties = true;

break;

}

continue;

}

// Duplicates are possible.

GetterSetterPair pair(node, static_cast<PropertyNode*>(nullptr));

GetterSetterMap::AddResult result = map.add(node->name()->impl(), pair);

auto& resultPair = result.iterator->value;

if (!result.isNewEntry) {

if (resultPair.first->m_type == node->m_type) {

resultPair.first->setIsOverriddenByDuplicate();

resultPair.first = node;

} else {

if (resultPair.second)

resultPair.second->setIsOverriddenByDuplicate();

resultPair.second = node;

}

}

}

// Iterate over the remaining properties in the list.

for (; p; p = p->m_next) {

PropertyNode* node = p->m_node;

dst = node->isInstanceClassProperty() ? prototype : dstOrConstructor;

if (p->isComputedClassField())

emitSaveComputedFieldName(generator, *p->m_node);

if (p->m_node->type() & (PropertyNode::PrivateGetter | PropertyNode::PrivateSetter))

continue;

if (p->isInstanceClassField()) {

ASSERT(instanceElementDefinitions);

ASSERT(node->m_type & PropertyNode::Constant);

instanceElementDefinitions->append(makeClassElementDefinition(p));

continue;

}

if (p->isStaticClassElement()) {

ASSERT(staticElementDefinitions);

staticElementDefinitions->append(makeClassElementDefinition(p));

continue;

}

// Handle regular values.

if (node->m_type & PropertyNode::Constant) {

emitPutConstantProperty(generator, dst, *node);

continue;

} else if (node->m_type & PropertyNode::Spread) {

generator.emitNode(dst, node->m_assign);

continue;

}

RefPtr<RegisterID> value = generator.emitNode(node->m_assign);

if (needsHomeObject(node->m_assign))

emitPutHomeObject(generator, value.get(), dst);

unsigned attributes = node->isClassProperty() ? (PropertyAttribute::Accessor | PropertyAttribute::DontEnum) : static_cast<unsigned>(PropertyAttribute::Accessor);

ASSERT(node->m_type & (PropertyNode::Getter | PropertyNode::Setter));

// This is a get/set property which may be overridden by a computed property or spread later.

if (canOverrideProperties) {

// Computed accessors.

if (node->m_type & PropertyNode::Computed) {

RefPtr<RegisterID> propertyName = generator.emitNode(node->m_expression);

if (generator.shouldSetFunctionName(node->m_assign)) {

propertyName = generator.emitToPropertyKey(generator.newTemporary(), propertyName.get());

generator.emitSetFunctionName(value.get(), propertyName.get());

}

if (node->m_type & PropertyNode::Getter)

generator.emitPutGetterByVal(dst, propertyName.get(), attributes, value.get());

else

generator.emitPutSetterByVal(dst, propertyName.get(), attributes, value.get());

continue;

}

if (node->m_type & PropertyNode::Getter)

generator.emitPutGetterById(dst, *node->name(), attributes, value.get());

else

generator.emitPutSetterById(dst, *node->name(), attributes, value.get());

continue;

}

// This is a get/set property pair.

GetterSetterMap& map = node->isStaticClassProperty() ? staticMap : instanceMap;

GetterSetterMap::iterator it = map.find(node->name()->impl());

ASSERT(it != map.end());

GetterSetterPair& pair = it->value;

// Was this already generated as a part of its partner?

if (pair.second == node || node->isOverriddenByDuplicate())

continue;

// Generate the paired node now.

RefPtr<RegisterID> getterReg;

RefPtr<RegisterID> setterReg;

RegisterID* secondReg = nullptr;

if (node->m_type & PropertyNode::Getter) {

getterReg = value;

if (pair.second) {

ASSERT(pair.second->m_type & PropertyNode::Setter);

setterReg = generator.emitNode(pair.second->m_assign);

secondReg = setterReg.get();

} else

setterReg = generator.emitLoad(nullptr, jsUndefined());

} else {

ASSERT(node->m_type & PropertyNode::Setter);

setterReg = value;

if (pair.second) {

ASSERT(pair.second->m_type & PropertyNode::Getter);

getterReg = generator.emitNode(pair.second->m_assign);

secondReg = getterReg.get();

} else

getterReg = generator.emitLoad(nullptr, jsUndefined());

}

if (pair.second) {

if (needsHomeObject(pair.second->m_assign))

emitPutHomeObject(generator, secondReg, dst);

}

generator.emitPutGetterSetter(dst, *node->name(), attributes, getterReg.get(), setterReg.get());

}

}

return dstOrConstructor;

}

void PropertyListNode::emitPutConstantProperty(BytecodeGenerator& generator, RegisterID* newObj, PropertyNode& node)

}

void PropertyListNode::emitSaveComputedFieldName(BytecodeGenerator& generator, PropertyNode& node)