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NodesCodegen.cpp
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NodesCodegen.cpp
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/*
* Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2003-2019 Apple Inc. All rights reserved.
* Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
* Copyright (C) 2007 Maks Orlovich
* Copyright (C) 2007 Eric Seidel <eric@webkit.org>
* Copyright (C) 2012 Igalia, S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "Nodes.h"
#include "NodeConstructors.h"
#include "BuiltinNames.h"
#include "BytecodeGenerator.h"
#include "BytecodeGeneratorBaseInlines.h"
#include "JSArrayIterator.h"
#include "JSAsyncGenerator.h"
#include "JSCInlines.h"
#include "JSGenerator.h"
#include "JSImmutableButterfly.h"
#include "JSMapIterator.h"
#include "JSSetIterator.h"
#include "JSStringIterator.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/text/StringBuilder.h>
namespace JSC {
/*
Details of the emitBytecode function.
Return value: The register holding the production's value.
dst: An optional parameter specifying the most efficient destination at
which to store the production's value.
If dst is null, you may return whatever VirtualRegister you want. Otherwise you have to return dst.
The dst argument provides for a crude form of copy propagation. For example,
x = 1
becomes
load r[x], 1
instead of
load r0, 1
mov r[x], r0
because the assignment node, "x =", passes r[x] as dst to the number node, "1".
*/
void ExpressionNode::emitBytecodeInConditionContext(BytecodeGenerator& generator, Label& trueTarget, Label& falseTarget, FallThroughMode fallThroughMode)
{
RegisterID* result = generator.emitNode(this);
if (fallThroughMode == FallThroughMeansTrue)
generator.emitJumpIfFalse(result, falseTarget);
else
generator.emitJumpIfTrue(result, trueTarget);
}
// ------------------------------ ThrowableExpressionData --------------------------------
RegisterID* ThrowableExpressionData::emitThrowReferenceError(BytecodeGenerator& generator, const String& message, RegisterID* dst)
{
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitThrowReferenceError(message);
if (dst)
return dst;
return generator.newTemporary();
}
// ------------------------------ ConstantNode ----------------------------------
void ConstantNode::emitBytecodeInConditionContext(BytecodeGenerator& generator, Label& trueTarget, Label& falseTarget, FallThroughMode fallThroughMode)
{
TriState value = TriState::Indeterminate;
JSValue constant = jsValue(generator);
if (LIKELY(constant))
value = constant.pureToBoolean();
if (UNLIKELY(needsDebugHook())) {
if (value != TriState::Indeterminate)
generator.emitDebugHook(this);
}
if (value == TriState::Indeterminate)
ExpressionNode::emitBytecodeInConditionContext(generator, trueTarget, falseTarget, fallThroughMode);
else if (value == TriState::True && fallThroughMode == FallThroughMeansFalse)
generator.emitJump(trueTarget);
else if (value == TriState::False && fallThroughMode == FallThroughMeansTrue)
generator.emitJump(falseTarget);
// All other cases are unconditional fall-throughs, like "if (true)".
}
RegisterID* ConstantNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
return nullptr;
JSValue constant = jsValue(generator);
if (UNLIKELY(!constant)) {
// 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);
}
// ------------------------------ NumberNode ----------------------------------
RegisterID* NumberNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
return nullptr;
return generator.emitLoad(dst, jsValue(generator), isIntegerNode() ? SourceCodeRepresentation::Integer : SourceCodeRepresentation::Double);
}
// ------------------------------ RegExpNode -----------------------------------
RegisterID* RegExpNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
return nullptr;
auto flags = Yarr::parseFlags(m_flags.string());
ASSERT(flags.hasValue());
RegExp* regExp = RegExp::create(generator.vm(), m_pattern.string(), flags.value());
if (regExp->isValid())
return generator.emitNewRegExp(generator.finalDestination(dst), regExp);
const char* messageCharacters = regExp->errorMessage();
const Identifier& message = generator.parserArena().identifierArena().makeIdentifier(generator.vm(), bitwise_cast<const LChar*>(messageCharacters), strlen(messageCharacters));
generator.emitThrowStaticError(ErrorTypeWithExtension::SyntaxError, message);
return generator.emitLoad(generator.finalDestination(dst), jsUndefined());
}
// ------------------------------ ThisNode -------------------------------------
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;
}
// ------------------------------ SuperNode -------------------------------------
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);
}
// ------------------------------ ImportNode -------------------------------------
RegisterID* ImportNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> importModule = generator.moveLinkTimeConstant(nullptr, LinkTimeConstant::importModule);
CallArguments arguments(generator, nullptr, 1);
generator.emitLoad(arguments.thisRegister(), jsUndefined());
generator.emitNode(arguments.argumentRegister(0), m_expr);
return generator.emitCall(generator.finalDestination(dst, importModule.get()), importModule.get(), NoExpectedFunction, arguments, divot(), divotStart(), divotEnd(), DebuggableCall::No);
}
// ------------------------------ NewTargetNode ----------------------------------
RegisterID* NewTargetNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
return nullptr;
return generator.move(dst, generator.newTarget());
}
// ------------------------------ ImportMetaNode ---------------------------------
RegisterID* ImportMetaNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
return generator.emitNode(dst, m_expr);
}
// ------------------------------ ResolveNode ----------------------------------
bool ResolveNode::isPure(BytecodeGenerator& generator) const
{
return generator.variable(m_ident).offset().isStack();
}
RegisterID* ResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
Variable var = generator.variable(m_ident);
if (RegisterID* local = var.local()) {
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);
}
JSTextPosition divot = m_start + m_ident.length();
generator.emitExpressionInfo(divot, m_start, divot);
RefPtr<RegisterID> scope = generator.emitResolveScope(dst, var);
RegisterID* finalDest = generator.finalDestination(dst);
RefPtr<RegisterID> uncheckedResult = generator.newTemporary();
generator.emitGetFromScope(uncheckedResult.get(), scope.get(), var, ThrowIfNotFound);
generator.emitTDZCheckIfNecessary(var, uncheckedResult.get(), nullptr);
generator.move(finalDest, uncheckedResult.get());
generator.emitProfileType(finalDest, var, m_position, m_position + m_ident.length());
return finalDest;
}
// ------------------------------ TemplateStringNode -----------------------------------
RegisterID* TemplateStringNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
return nullptr;
ASSERT(cooked());
return generator.emitLoad(dst, JSValue(generator.addStringConstant(*cooked())));
}
// ------------------------------ TemplateLiteralNode -----------------------------------
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.emitToString(generator.finalDestination(dst, temporaryRegisters[0].get()), temporaryRegisters[0].get());
return generator.emitStrcat(generator.finalDestination(dst, temporaryRegisters[0].get()), temporaryRegisters[0].get(), temporaryRegisters.size());
}
// ------------------------------ TaggedTemplateNode -----------------------------------
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);
base = generator.newTemporary();
base = generator.emitNode(base.get(), dot->base());
if (dot->base()->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
tag = generator.emitGetById(generator.newTemporary(), base.get(), thisValue.get(), dot->identifier());
} else
tag = generator.emitGetById(generator.newTemporary(), base.get(), dot->identifier());
}
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);
}
// ------------------------------ ArrayNode ------------------------------------
RegisterID* ArrayNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
bool hadVariableExpression = false;
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 (UNLIKELY(!constant))
hadVariableExpression = true;
else
recommendedIndexingType = leastUpperBoundOfIndexingTypeAndValue(recommendedIndexingType, constant);
}
++length;
}
auto newArray = [&] (RegisterID* dst, ElementNode* elements, unsigned length, bool hadVariableExpression) {
if (length && !hadVariableExpression) {
recommendedIndexingType |= CopyOnWrite;
ASSERT(generator.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.
auto* array = JSImmutableButterfly::create(generator.vm(), recommendedIndexingType, length);
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);
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, hadVariableExpression);
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, hadVariableExpression);
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
{
if (m_elision)
return false;
for (ElementNode* ptr = m_element; ptr; ptr = ptr->next()) {
if (ptr->elision())
return false;
if (ptr->value()->isSpreadExpression())
return false;
}
return true;
}
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;
}
// ------------------------------ ObjectLiteralNode ----------------------------
RegisterID* ObjectLiteralNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (!m_list) {
if (dst == generator.ignoredResult())
return nullptr;
return generator.emitNewObject(generator.finalDestination(dst));
}
RefPtr<RegisterID> newObj = generator.emitNewObject(generator.tempDestination(dst));
generator.emitNode(newObj.get(), m_list);
return generator.move(dst, newObj.get());
}
// ------------------------------ PropertyListNode -----------------------------
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)
{
// Walk the list and declare any Private property names (e.g. `#foo`) in the provided scope.
RefPtr<RegisterID> createPrivateSymbol;
for (PropertyListNode* p = this; p; p = p->m_next) {
const PropertyNode& node = *p->m_node;
if (node.type() & PropertyNode::Private) {
if (!createPrivateSymbol)
createPrivateSymbol = generator.moveLinkTimeConstant(nullptr, LinkTimeConstant::createPrivateSymbol);
CallArguments arguments(generator, nullptr, 0);
generator.emitLoad(arguments.thisRegister(), jsUndefined());
RefPtr<RegisterID> symbol = generator.emitCall(generator.finalDestination(nullptr, createPrivateSymbol.get()), createPrivateSymbol.get(), NoExpectedFunction, arguments, position(), position(), position(), DebuggableCall::No);
Variable var = generator.variable(*node.name());
generator.emitPutToScope(scope, var, symbol.get(), DoNotThrowIfNotFound, InitializationMode::ConstInitialization);
}
}
}
RegisterID* PropertyListNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dstOrConstructor, RegisterID* prototype, Vector<JSTextPosition>* instanceFieldLocations, Vector<JSTextPosition>* staticFieldLocations)
{
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->isComputedClassField())
emitSaveComputedFieldName(generator, *p->m_node);
if (p->isInstanceClassField()) {
ASSERT(instanceFieldLocations);
instanceFieldLocations->append(p->position());
continue;
}
if (p->isStaticClassField()) {
ASSERT(staticFieldLocations);
staticFieldLocations->append(p->position());
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 computed property or a spread, just emit everything as that may override previous values.
bool canOverrideProperties = false;
typedef std::pair<PropertyNode*, PropertyNode*> GetterSetterPair;
typedef HashMap<UniquedStringImpl*, GetterSetterPair, IdentifierRepHash> GetterSetterMap;
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;
}
if (node->m_type & PropertyNode::Constant)
continue;
// Duplicates are possible.
GetterSetterPair pair(node, static_cast<PropertyNode*>(nullptr));
GetterSetterMap& map = node->isStaticClassProperty() ? staticMap : instanceMap;
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->isInstanceClassField()) {
ASSERT(instanceFieldLocations);
ASSERT(node->m_type & PropertyNode::Constant);
instanceFieldLocations->append(p->position());
continue;
}
if (p->isStaticClassField()) {
ASSERT(staticFieldLocations);
staticFieldLocations->append(p->position());
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);
bool needsSuperBinding = node->needsSuperBinding();
if (needsSuperBinding)
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.newTemporary();
generator.emitLoad(setterReg.get(), 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.newTemporary();
generator.emitLoad(getterReg.get(), jsUndefined());
}
}
ASSERT(!pair.second || needsSuperBinding == pair.second->needsSuperBinding());
if (needsSuperBinding && pair.second)
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)
{
// Private fields are handled in a synthetic classFieldInitializer function, not here.
ASSERT(!(node.type() & PropertyNode::Private));
if (PropertyNode::isUnderscoreProtoSetter(generator.vm(), node)) {
RefPtr<RegisterID> prototype = generator.emitNode(node.m_assign);
generator.emitDirectSetPrototypeOf(newObj, prototype.get());
return;
}
bool shouldSetFunctionName = generator.shouldSetFunctionName(node.m_assign);
RefPtr<RegisterID> propertyName;
if (!node.name()) {
propertyName = generator.newTemporary();
if (shouldSetFunctionName)
generator.emitToPropertyKey(propertyName.get(), generator.emitNode(node.m_expression));
else
generator.emitNode(propertyName.get(), node.m_expression);
}
RefPtr<RegisterID> value = generator.emitNode(node.m_assign);
if (node.needsSuperBinding())
emitPutHomeObject(generator, value.get(), newObj);
if (node.isClassProperty()) {
ASSERT(node.needsSuperBinding());
if (node.name())
propertyName = generator.emitLoad(nullptr, *node.name());
if (shouldSetFunctionName)
generator.emitSetFunctionName(value.get(), propertyName.get());
generator.emitCallDefineProperty(newObj, propertyName.get(), value.get(), nullptr, nullptr, BytecodeGenerator::PropertyConfigurable | BytecodeGenerator::PropertyWritable, m_position);
return;
}
if (const auto* identifier = node.name()) {
ASSERT(!propertyName);
Optional<uint32_t> optionalIndex = parseIndex(*identifier);
if (!optionalIndex) {
generator.emitDirectPutById(newObj, *identifier, value.get());
return;
}
propertyName = generator.emitLoad(nullptr, jsNumber(optionalIndex.value()));
generator.emitDirectPutByVal(newObj, propertyName.get(), value.get());
return;
}
if (shouldSetFunctionName)
generator.emitSetFunctionName(value.get(), propertyName.get());
generator.emitDirectPutByVal(newObj, propertyName.get(), value.get());
}
void PropertyListNode::emitSaveComputedFieldName(BytecodeGenerator& generator, PropertyNode& node)
{
ASSERT(node.isComputedClassField());
// The 'name' refers to a synthetic private name in the class scope, where the property key is saved for later use.
const Identifier& description = *node.name();
Variable var = generator.variable(description);
ASSERT(!var.local());
RefPtr<RegisterID> propertyExpr = generator.emitNode(node.m_expression);
RefPtr<RegisterID> propertyName = generator.emitToPropertyKey(generator.newTemporary(), propertyExpr.get());
if (node.isStaticClassField()) {
Ref<Label> validPropertyNameLabel = generator.newLabel();
RefPtr<RegisterID> prototypeString = generator.emitLoad(nullptr, JSValue(generator.addStringConstant(generator.propertyNames().prototype)));
generator.emitJumpIfFalse(generator.emitBinaryOp<OpStricteq>(generator.newTemporary(), prototypeString.get(), propertyName.get(), OperandTypes(ResultType::stringType(), ResultType::stringType())), validPropertyNameLabel.get());
generator.emitThrowTypeError("Cannot declare a static field named 'prototype'");
generator.emitLabel(validPropertyNameLabel.get());
}
RefPtr<RegisterID> scope = generator.emitResolveScope(nullptr, var);
generator.emitPutToScope(scope.get(), var, propertyName.get(), ThrowIfNotFound, InitializationMode::ConstInitialization);
}
// ------------------------------ BracketAccessorNode --------------------------------
static bool isNonIndexStringElement(ExpressionNode& element)
{
return element.isString() && !parseIndex(static_cast<StringNode&>(element).value());
}
RegisterID* BracketAccessorNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (m_base->isSuperNode()) {
RefPtr<RegisterID> finalDest = generator.finalDestination(dst);
RefPtr<RegisterID> thisValue = generator.ensureThis();
RefPtr<RegisterID> superBase = emitSuperBaseForCallee(generator);
if (isNonIndexStringElement(*m_subscript)) {
const Identifier& id = static_cast<StringNode*>(m_subscript)->value();
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitGetById(finalDest.get(), superBase.get(), thisValue.get(), id);
} else {
RefPtr<RegisterID> subscript = generator.emitNodeForProperty(m_subscript);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitGetByVal(finalDest.get(), superBase.get(), thisValue.get(), subscript.get());
}
generator.emitProfileType(finalDest.get(), divotStart(), divotEnd());
return finalDest.get();
}
RegisterID* ret;
RefPtr<RegisterID> finalDest = generator.finalDestination(dst);
bool subscriptIsNonIndexString = isNonIndexStringElement(*m_subscript);
RefPtr<RegisterID> base = subscriptIsNonIndexString
? generator.emitNode(m_base)
: generator.emitNodeForLeftHandSide(m_base, m_subscriptHasAssignments, m_subscript->isPure(generator));
if (m_base->isOptionalChainBase())
generator.emitOptionalCheck(base.get());
if (subscriptIsNonIndexString) {
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
ret = generator.emitGetById(finalDest.get(), base.get(), static_cast<StringNode*>(m_subscript)->value());
} else {
RegisterID* property = generator.emitNodeForProperty(m_subscript);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
ret = generator.emitGetByVal(finalDest.get(), base.get(), property);
}
generator.emitProfileType(finalDest.get(), divotStart(), divotEnd());
return ret;
}
// ------------------------------ DotAccessorNode --------------------------------
RegisterID* DotAccessorNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> finalDest = generator.finalDestination(dst);
bool baseIsSuper = m_base->isSuperNode();
RefPtr<RegisterID> base;
if (baseIsSuper)
base = emitSuperBaseForCallee(generator);
else {
base = generator.emitNode(m_base);
if (m_base->isOptionalChainBase())
generator.emitOptionalCheck(base.get());
}
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
RegisterID* ret = emitGetPropertyValue(generator, finalDest.get(), base.get());
generator.emitProfileType(finalDest.get(), divotStart(), divotEnd());
return ret;
}
RegisterID* BaseDotNode::emitGetPropertyValue(BytecodeGenerator& generator, RegisterID* dst, RegisterID* base, RefPtr<RegisterID>& thisValue)
{
if (isPrivateField()) {
Variable var = generator.variable(m_ident);
ASSERT_WITH_MESSAGE(!var.local(), "Private Field names must be stored in captured variables");
RefPtr<RegisterID> scope = generator.emitResolveScope(nullptr, var);
RefPtr<RegisterID> privateName = generator.newTemporary();
generator.emitGetFromScope(privateName.get(), scope.get(), var, DoNotThrowIfNotFound);
return generator.emitDirectGetByVal(dst, base, privateName.get());
}
if (m_base->isSuperNode()) {
if (!thisValue)
thisValue = generator.ensureThis();
return generator.emitGetById(dst, base, thisValue.get(), m_ident);
}
return generator.emitGetById(dst, base, m_ident);
}
RegisterID* BaseDotNode::emitGetPropertyValue(BytecodeGenerator& generator, RegisterID* dst, RegisterID* base)
{
RefPtr<RegisterID> thisValue;
return emitGetPropertyValue(generator, dst, base, thisValue);
}
RegisterID* BaseDotNode::emitPutProperty(BytecodeGenerator& generator, RegisterID* base, RegisterID* value, RefPtr<RegisterID>& thisValue)
{
if (isPrivateField()) {
Variable var = generator.variable(m_ident);
ASSERT_WITH_MESSAGE(!var.local(), "Private Field names must be stored in captured variables");
RefPtr<RegisterID> scope = generator.emitResolveScope(nullptr, var);
RefPtr<RegisterID> privateName = generator.newTemporary();
generator.emitGetFromScope(privateName.get(), scope.get(), var, DoNotThrowIfNotFound);
return generator.emitPrivateFieldPut(base, privateName.get(), value);
}
if (m_base->isSuperNode()) {
if (!thisValue)
thisValue = generator.ensureThis();
return generator.emitPutById(base, thisValue.get(), m_ident, value);
}
return generator.emitPutById(base, m_ident, value);
}
RegisterID* BaseDotNode::emitPutProperty(BytecodeGenerator& generator, RegisterID* base, RegisterID* value)
{
RefPtr<RegisterID> thisValue;
return emitPutProperty(generator, base, value, thisValue);
}
// ------------------------------ ArgumentListNode -----------------------------
RegisterID* ArgumentListNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
ASSERT(m_expr);
return generator.emitNode(dst, m_expr);
}
// ------------------------------ NewExprNode ----------------------------------
RegisterID* NewExprNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
ExpectedFunction expectedFunction;
if (m_expr->isResolveNode())
expectedFunction = generator.expectedFunctionForIdentifier(static_cast<ResolveNode*>(m_expr)->identifier());
else
expectedFunction = NoExpectedFunction;
RefPtr<RegisterID> func = generator.emitNode(m_expr);
RefPtr<RegisterID> returnValue = generator.finalDestination(dst, func.get());
CallArguments callArguments(generator, m_args);
return generator.emitConstruct(returnValue.get(), func.get(), func.get(), expectedFunction, callArguments, divot(), divotStart(), divotEnd());
}
CallArguments::CallArguments(BytecodeGenerator& generator, ArgumentsNode* argumentsNode, unsigned additionalArguments)
: m_argumentsNode(argumentsNode)
, m_padding(0)
{
size_t argumentCountIncludingThis = 1 + additionalArguments; // 'this' register.
if (argumentsNode) {
for (ArgumentListNode* node = argumentsNode->m_listNode; node; node = node->m_next)
++argumentCountIncludingThis;
}
m_argv.grow(argumentCountIncludingThis);
for (int i = argumentCountIncludingThis - 1; i >= 0; --i) {
m_argv[i] = generator.newTemporary();