/*

* Copyright (C) 2010-2019 Apple Inc. All rights reserved.

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

* 1. Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* 2. Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the distribution.

*

* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''

* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS

* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

* THE POSSIBILITY OF SUCH DAMAGE.

*/

#pragma once

#include "BuiltinNames.h"

#include "BytecodeIntrinsicRegistry.h"

#include "MathCommon.h"

#include "NodeConstructors.h"

#include "SyntaxChecker.h"

#include "VariableEnvironment.h"

#include <utility>

namespace JSC {

class ASTBuilder {

struct BinaryOpInfo {

BinaryOpInfo() {}

BinaryOpInfo(const JSTextPosition& otherStart, const JSTextPosition& otherDivot, const JSTextPosition& otherEnd, bool rhsHasAssignment)

: start(otherStart)

, divot(otherDivot)

, end(otherEnd)

, hasAssignment(rhsHasAssignment)

{

}

BinaryOpInfo(const BinaryOpInfo& lhs, const BinaryOpInfo& rhs)

: start(lhs.start)

, divot(rhs.start)

, end(rhs.end)

, hasAssignment(lhs.hasAssignment || rhs.hasAssignment)

{

}

JSTextPosition start;

JSTextPosition divot;

JSTextPosition end;

bool hasAssignment;

};

struct AssignmentInfo {

AssignmentInfo() {}

AssignmentInfo(ExpressionNode* node, const JSTextPosition& start, const JSTextPosition& divot, int initAssignments, Operator op)

: m_node(node)

, m_start(start)

, m_divot(divot)

, m_initAssignments(initAssignments)

, m_op(op)

{

ASSERT(m_divot.offset >= m_divot.lineStartOffset);

ASSERT(m_start.offset >= m_start.lineStartOffset);

}

ExpressionNode* m_node;

JSTextPosition m_start;

JSTextPosition m_divot;

int m_initAssignments;

Operator m_op;

};

public:

ASTBuilder(VM& vm, ParserArena& parserArena, SourceCode* sourceCode)

: m_vm(vm)

, m_parserArena(parserArena)

, m_sourceCode(sourceCode)

, m_evalCount(0)

{

}

struct BinaryExprContext {

BinaryExprContext(ASTBuilder&) {}

};

struct UnaryExprContext {

UnaryExprContext(ASTBuilder&) {}

};

typedef ExpressionNode* Expression;

typedef JSC::SourceElements* SourceElements;

typedef ArgumentsNode* Arguments;

typedef CommaNode* Comma;

typedef PropertyNode* Property;

typedef PropertyListNode* PropertyList;

typedef ElementNode* ElementList;

typedef ArgumentListNode* ArgumentsList;

typedef TemplateExpressionListNode* TemplateExpressionList;

typedef TemplateStringNode* TemplateString;

typedef TemplateStringListNode* TemplateStringList;

typedef TemplateLiteralNode* TemplateLiteral;

typedef FunctionParameters* FormalParameterList;

typedef FunctionMetadataNode* FunctionBody;

typedef ClassExprNode* ClassExpression;

typedef ModuleNameNode* ModuleName;

typedef ImportSpecifierNode* ImportSpecifier;

typedef ImportSpecifierListNode* ImportSpecifierList;

typedef ExportSpecifierNode* ExportSpecifier;

typedef ExportSpecifierListNode* ExportSpecifierList;

typedef StatementNode* Statement;

typedef ClauseListNode* ClauseList;

typedef CaseClauseNode* Clause;

typedef std::pair<ExpressionNode*, BinaryOpInfo> BinaryOperand;

typedef DestructuringPatternNode* DestructuringPattern;

typedef ArrayPatternNode* ArrayPattern;

typedef ObjectPatternNode* ObjectPattern;

typedef BindingNode* BindingPattern;

typedef AssignmentElementNode* AssignmentElement;

static constexpr bool CreatesAST = true;

static constexpr bool NeedsFreeVariableInfo = true;

static constexpr bool CanUseFunctionCache = true;

static constexpr OptionSet<LexerFlags> DontBuildKeywords = { };

static constexpr OptionSet<LexerFlags> DontBuildStrings = { };

ExpressionNode* makeBinaryNode(const JSTokenLocation&, int token, std::pair<ExpressionNode*, BinaryOpInfo>, std::pair<ExpressionNode*, BinaryOpInfo>);

ExpressionNode* makeFunctionCallNode(const JSTokenLocation&, ExpressionNode* func, bool previousBaseWasSuper, ArgumentsNode* args, const JSTextPosition& divotStart, const JSTextPosition& divot, const JSTextPosition& divotEnd, size_t callOrApplyChildDepth, bool isOptionalCall);

JSC::SourceElements* createSourceElements() { return new (m_parserArena) JSC::SourceElements(); }

int features() const { return m_scope.m_features; }

int numConstants() const { return m_scope.m_numConstants; }

ExpressionNode* makeAssignNode(const JSTokenLocation&, ExpressionNode* left, Operator, ExpressionNode* right, bool leftHasAssignments, bool rightHasAssignments, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end);

ExpressionNode* makePrefixNode(const JSTokenLocation&, ExpressionNode*, Operator, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end);

ExpressionNode* makePostfixNode(const JSTokenLocation&, ExpressionNode*, Operator, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end);

ExpressionNode* makeTypeOfNode(const JSTokenLocation&, ExpressionNode*);

ExpressionNode* makeDeleteNode(const JSTokenLocation&, ExpressionNode*, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end);

ExpressionNode* makeNegateNode(const JSTokenLocation&, ExpressionNode*);

ExpressionNode* makeBitwiseNotNode(const JSTokenLocation&, ExpressionNode*);

ExpressionNode* makePowNode(const JSTokenLocation&, ExpressionNode* left, ExpressionNode* right, bool rightHasAssignments);

ExpressionNode* makeMultNode(const JSTokenLocation&, ExpressionNode* left, ExpressionNode* right, bool rightHasAssignments);

ExpressionNode* makeDivNode(const JSTokenLocation&, ExpressionNode* left, ExpressionNode* right, bool rightHasAssignments);

ExpressionNode* makeModNode(const JSTokenLocation&, ExpressionNode* left, ExpressionNode* right, bool rightHasAssignments);

ExpressionNode* makeAddNode(const JSTokenLocation&, ExpressionNode* left, ExpressionNode* right, bool rightHasAssignments);

ExpressionNode* makeSubNode(const JSTokenLocation&, ExpressionNode* left, ExpressionNode* right, bool rightHasAssignments);

ExpressionNode* makeBitXOrNode(const JSTokenLocation&, ExpressionNode* left, ExpressionNode* right, bool rightHasAssignments);

ExpressionNode* makeBitAndNode(const JSTokenLocation&, ExpressionNode* left, ExpressionNode* right, bool rightHasAssignments);

ExpressionNode* makeBitOrNode(const JSTokenLocation&, ExpressionNode* left, ExpressionNode* right, bool rightHasAssignments);

ExpressionNode* makeCoalesceNode(const JSTokenLocation&, ExpressionNode* left, ExpressionNode* right);

ExpressionNode* makeLeftShiftNode(const JSTokenLocation&, ExpressionNode* left, ExpressionNode* right, bool rightHasAssignments);

ExpressionNode* makeRightShiftNode(const JSTokenLocation&, ExpressionNode* left, ExpressionNode* right, bool rightHasAssignments);

ExpressionNode* makeURightShiftNode(const JSTokenLocation&, ExpressionNode* left, ExpressionNode* right, bool rightHasAssignments);

ExpressionNode* createLogicalNot(const JSTokenLocation& location, ExpressionNode* expr)

{

if (expr->isNumber())

return createBoolean(location, isZeroOrUnordered(static_cast<NumberNode*>(expr)->value()));

return new (m_parserArena) LogicalNotNode(location, expr);

}

ExpressionNode* createUnaryPlus(const JSTokenLocation& location, ExpressionNode* expr) { return new (m_parserArena) UnaryPlusNode(location, expr); }

ExpressionNode* createVoid(const JSTokenLocation& location, ExpressionNode* expr)

{

incConstants();

return new (m_parserArena) VoidNode(location, expr);

}

ExpressionNode* createThisExpr(const JSTokenLocation& location)

{

usesThis();

return new (m_parserArena) ThisNode(location);

}

ExpressionNode* createSuperExpr(const JSTokenLocation& location)

{

return new (m_parserArena) SuperNode(location);

}

ExpressionNode* createImportExpr(const JSTokenLocation& location, ExpressionNode* expr, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end)

{

auto* node = new (m_parserArena) ImportNode(location, expr);

setExceptionLocation(node, start, divot, end);

return node;

}

ExpressionNode* createNewTargetExpr(const JSTokenLocation location)

{

usesNewTarget();

return new (m_parserArena) NewTargetNode(location);

}

ExpressionNode* createImportMetaExpr(const JSTokenLocation& location, ExpressionNode* expr) { return new (m_parserArena) ImportMetaNode(location, expr); }

bool isMetaProperty(ExpressionNode* node) { return node->isMetaProperty(); }

bool isNewTarget(ExpressionNode* node) { return node->isNewTarget(); }

bool isImportMeta(ExpressionNode* node) { return node->isImportMeta(); }

ExpressionNode* createResolve(const JSTokenLocation& location, const Identifier& ident, const JSTextPosition& start, const JSTextPosition& end)

{

if (m_vm.propertyNames->arguments == ident)

usesArguments();

if (ident.isSymbol()) {

auto entry = m_vm.bytecodeIntrinsicRegistry().lookup(ident);

if (entry)

return new (m_parserArena) BytecodeIntrinsicNode(BytecodeIntrinsicNode::Type::Constant, location, entry.value(), ident, nullptr, start, start, end);

}

return new (m_parserArena) ResolveNode(location, ident, start);

}

ExpressionNode* createPrivateIdentifierNode(const JSTokenLocation& location, const Identifier& ident)

{

return new (m_parserArena) PrivateIdentifierNode(location, ident);

}

ExpressionNode* createObjectLiteral(const JSTokenLocation& location) { return new (m_parserArena) ObjectLiteralNode(location); }

ExpressionNode* createObjectLiteral(const JSTokenLocation& location, PropertyListNode* properties) { return new (m_parserArena) ObjectLiteralNode(location, properties); }

ExpressionNode* createArray(const JSTokenLocation& location, int elisions)

{

if (elisions)

incConstants();

return new (m_parserArena) ArrayNode(location, elisions);

}

ExpressionNode* createArray(const JSTokenLocation& location, ElementNode* elems) { return new (m_parserArena) ArrayNode(location, elems); }

ExpressionNode* createArray(const JSTokenLocation& location, int elisions, ElementNode* elems)

{

if (elisions)

incConstants();

return new (m_parserArena) ArrayNode(location, elisions, elems);

}

ExpressionNode* createDoubleExpr(const JSTokenLocation& location, double d)

{

incConstants();

return new (m_parserArena) DoubleNode(location, d);

}

ExpressionNode* createIntegerExpr(const JSTokenLocation& location, double d)

{

incConstants();

return new (m_parserArena) IntegerNode(location, d);

}

ExpressionNode* createBigInt(const JSTokenLocation& location, const Identifier* bigInt, uint8_t radix)

{

incConstants();

return new (m_parserArena) BigIntNode(location, *bigInt, radix);

}

ExpressionNode* createString(const JSTokenLocation& location, const Identifier* string)

{

ASSERT(string);

incConstants();

return new (m_parserArena) StringNode(location, *string);

}

ExpressionNode* createBoolean(const JSTokenLocation& location, bool b)

{

incConstants();

return new (m_parserArena) BooleanNode(location, b);

}

ExpressionNode* createNull(const JSTokenLocation& location)

{

incConstants();

return new (m_parserArena) NullNode(location);

}

ExpressionNode* createBracketAccess(const JSTokenLocation& location, ExpressionNode* base, ExpressionNode* property, bool propertyHasAssignments, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end)

{

if (base->isSuperNode())

usesSuperProperty();

BracketAccessorNode* node = new (m_parserArena) BracketAccessorNode(location, base, property, propertyHasAssignments);

setExceptionLocation(node, start, divot, end);

return node;

}

ExpressionNode* createDotAccess(const JSTokenLocation& location, ExpressionNode* base, const Identifier* property, DotType type, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end)

{

if (base->isSuperNode())

usesSuperProperty();

DotAccessorNode* node = new (m_parserArena) DotAccessorNode(location, base, *property, type);

setExceptionLocation(node, start, divot, end);

return node;

}

ExpressionNode* createSpreadExpression(const JSTokenLocation& location, ExpressionNode* expression, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end)

{

auto node = new (m_parserArena) SpreadExpressionNode(location, expression);

setExceptionLocation(node, start, divot, end);

return node;

}

ExpressionNode* createObjectSpreadExpression(const JSTokenLocation& location, ExpressionNode* expression, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end)

{

auto node = new (m_parserArena) ObjectSpreadExpressionNode(location, expression);

setExceptionLocation(node, start, divot, end);

return node;

}

TemplateStringNode* createTemplateString(const JSTokenLocation& location, const Identifier* cooked, const Identifier* raw)

{

return new (m_parserArena) TemplateStringNode(location, cooked, raw);

}

TemplateStringListNode* createTemplateStringList(TemplateStringNode* templateString)

{

return new (m_parserArena) TemplateStringListNode(templateString);

}

TemplateStringListNode* createTemplateStringList(TemplateStringListNode* templateStringList, TemplateStringNode* templateString)

{

return new (m_parserArena) TemplateStringListNode(templateStringList, templateString);

}

TemplateExpressionListNode* createTemplateExpressionList(ExpressionNode* expression)

{

return new (m_parserArena) TemplateExpressionListNode(expression);

}

TemplateExpressionListNode* createTemplateExpressionList(TemplateExpressionListNode* templateExpressionListNode, ExpressionNode* expression)

{

return new (m_parserArena) TemplateExpressionListNode(templateExpressionListNode, expression);

}

TemplateLiteralNode* createTemplateLiteral(const JSTokenLocation& location, TemplateStringListNode* templateStringList)

{

return new (m_parserArena) TemplateLiteralNode(location, templateStringList);

}

TemplateLiteralNode* createTemplateLiteral(const JSTokenLocation& location, TemplateStringListNode* templateStringList, TemplateExpressionListNode* templateExpressionList)

{

return new (m_parserArena) TemplateLiteralNode(location, templateStringList, templateExpressionList);

}

ExpressionNode* createTaggedTemplate(const JSTokenLocation& location, ExpressionNode* base, TemplateLiteralNode* templateLiteral, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end)

{

auto node = new (m_parserArena) TaggedTemplateNode(location, base, templateLiteral);

setExceptionLocation(node, start, divot, end);

setEndOffset(node, end.offset);

return node;

}

ExpressionNode* createRegExp(const JSTokenLocation& location, const Identifier& pattern, const Identifier& flags, const JSTextPosition& start)

{

if (Yarr::hasError(Yarr::checkSyntax(pattern.string(), flags.string())))

return nullptr;

RegExpNode* node = new (m_parserArena) RegExpNode(location, pattern, flags);

int size = pattern.length() + 2; // + 2 for the two /'s

JSTextPosition end = start + size;

setExceptionLocation(node, start, end, end);

return node;

}

ExpressionNode* createNewExpr(const JSTokenLocation& location, ExpressionNode* expr, ArgumentsNode* arguments, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end)

{

NewExprNode* node = new (m_parserArena) NewExprNode(location, expr, arguments);

setExceptionLocation(node, start, divot, end);

return node;

}

ExpressionNode* createNewExpr(const JSTokenLocation& location, ExpressionNode* expr, const JSTextPosition& start, const JSTextPosition& end)

{

NewExprNode* node = new (m_parserArena) NewExprNode(location, expr);

setExceptionLocation(node, start, end, end);

return node;

}

ExpressionNode* createOptionalChain(const JSTokenLocation& location, ExpressionNode* base, ExpressionNode* expr, bool isOutermost)

{

base->setIsOptionalChainBase();

return new (m_parserArena) OptionalChainNode(location, expr, isOutermost);

}

ExpressionNode* createConditionalExpr(const JSTokenLocation& location, ExpressionNode* condition, ExpressionNode* lhs, ExpressionNode* rhs)

{

return new (m_parserArena) ConditionalNode(location, condition, lhs, rhs);

}

ExpressionNode* createAssignResolve(const JSTokenLocation& location, const Identifier& ident, ExpressionNode* rhs, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end, AssignmentContext assignmentContext)

{

if (rhs->isBaseFuncExprNode()) {

auto metadata = static_cast<BaseFuncExprNode*>(rhs)->metadata();

metadata->setEcmaName(ident);

} else if (rhs->isClassExprNode())

static_cast<ClassExprNode*>(rhs)->setEcmaName(ident);

AssignResolveNode* node = new (m_parserArena) AssignResolveNode(location, ident, rhs, assignmentContext);

setExceptionLocation(node, start, divot, end);

return node;

}

YieldExprNode* createYield(const JSTokenLocation& location)

{

return new (m_parserArena) YieldExprNode(location, nullptr, /* delegate */ false);

}

YieldExprNode* createYield(const JSTokenLocation& location, ExpressionNode* argument, bool delegate, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end)

{

YieldExprNode* node = new (m_parserArena) YieldExprNode(location, argument, delegate);

setExceptionLocation(node, start, divot, end);

return node;

}

AwaitExprNode* createAwait(const JSTokenLocation& location, ExpressionNode* argument, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end)

{

ASSERT(argument);

usesAwait();

AwaitExprNode* node = new (m_parserArena) AwaitExprNode(location, argument);

setExceptionLocation(node, start, divot, end);

return node;

}

DefineFieldNode* createDefineField(const JSTokenLocation& location, const Identifier* ident, ExpressionNode* initializer, DefineFieldNode::Type type)

{

return new (m_parserArena) DefineFieldNode(location, ident, initializer, type);

}

ClassExprNode* createClassExpr(const JSTokenLocation& location, const ParserClassInfo<ASTBuilder>& classInfo, VariableEnvironment&& classHeadEnvironment, VariableEnvironment&& classEnvironment, ExpressionNode* constructor,

ExpressionNode* parentClass, PropertyListNode* classElements, const JSTextPosition& start, const JSTextPosition& divot, const JSTextPosition& end)

{

SourceCode source = m_sourceCode->subExpression(classInfo.startOffset, classInfo.endOffset, classInfo.startLine, classInfo.startColumn);

ClassExprNode* node = new (m_parserArena) ClassExprNode(location, *classInfo.className, source, WTFMove(classHeadEnvironment), WTFMove(classEnvironment), constructor, parentClass, classElements);

setExceptionLocation(node, start, divot, end);

return node;

}

ExpressionNode* createFunctionExpr(const JSTokenLocation& location, const ParserFunctionInfo<ASTBuilder>& functionInfo)

{

FuncExprNode* result = new (m_parserArena) FuncExprNode(location, *functionInfo.name, functionInfo.body,

m_sourceCode->subExpression(functionInfo.startOffset, functionInfo.endOffset, functionInfo.startLine, functionInfo.parametersStartColumn));

functionInfo.body->setLoc(functionInfo.startLine, functionInfo.endLine, location.startOffset, location.lineStartOffset);

return result;

}

ExpressionNode* createGeneratorFunctionBody(const JSTokenLocation& location, const ParserFunctionInfo<ASTBuilder>& functionInfo, const Identifier& name)

{

FuncExprNode* result = static_cast<FuncExprNode*>(createFunctionExpr(location, functionInfo));

if (!name.isNull())

result->metadata()->setEcmaName(name);

return result;

}

ExpressionNode* createAsyncFunctionBody(const JSTokenLocation& location, const ParserFunctionInfo<ASTBuilder>& functionInfo, SourceParseMode parseMode)

{

if (parseMode == SourceParseMode::AsyncArrowFunctionBodyMode) {

SourceCode source = m_sourceCode->subExpression(functionInfo.startOffset, functionInfo.body->isArrowFunctionBodyExpression() ? functionInfo.endOffset - 1 : functionInfo.endOffset, functionInfo.startLine, functionInfo.parametersStartColumn);

FuncExprNode* result = new (m_parserArena) FuncExprNode(location, *functionInfo.name, functionInfo.body, source);

functionInfo.body->setLoc(functionInfo.startLine, functionInfo.endLine, location.startOffset, location.lineStartOffset);

return result;

}

return createFunctionExpr(location, functionInfo);

}

ExpressionNode* createMethodDefinition(const JSTokenLocation& location, const ParserFunctionInfo<ASTBuilder>& functionInfo)

{

MethodDefinitionNode* result = new (m_parserArena) MethodDefinitionNode(location, *functionInfo.name, functionInfo.body,

m_sourceCode->subExpression(functionInfo.startOffset, functionInfo.endOffset, functionInfo.startLine, functionInfo.parametersStartColumn));

functionInfo.body->setLoc(functionInfo.startLine, functionInfo.endLine, location.startOffset, location.lineStartOffset);

return result;

}

FunctionMetadataNode* createFunctionMetadata(

const JSTokenLocation& startLocation, const JSTokenLocation& endLocation,

unsigned startColumn, unsigned endColumn, int functionKeywordStart,

int functionNameStart, int parametersStart, LexicalScopeFeatures lexicalScopeFeatures,

ConstructorKind constructorKind, SuperBinding superBinding,

unsigned parameterCount,

SourceParseMode mode, bool isArrowFunctionBodyExpression)

{

return new (m_parserArena) FunctionMetadataNode(

m_parserArena, startLocation, endLocation, startColumn, endColumn,

functionKeywordStart, functionNameStart, parametersStart,

lexicalScopeFeatures, constructorKind, superBinding,

parameterCount, mode, isArrowFunctionBodyExpression);

}

ExpressionNode* createArrowFunctionExpr(const JSTokenLocation& location, const ParserFunctionInfo<ASTBuilder>& functionInfo)

{

usesArrowFunction();

SourceCode source = m_sourceCode->subExpression(functionInfo.startOffset, functionInfo.body->isArrowFunctionBodyExpression() ? functionInfo.endOffset - 1 : functionInfo.endOffset, functionInfo.startLine, functionInfo.parametersStartColumn);

ArrowFuncExprNode* result = new (m_parserArena) ArrowFuncExprNode(location, *functionInfo.name, functionInfo.body, source);

functionInfo.body->setLoc(functionInfo.startLine, functionInfo.endLine, location.startOffset, location.lineStartOffset);

return result;

}

ArgumentsNode* createArguments() { return new (m_parserArena) ArgumentsNode(); }

ArgumentsNode* createArguments(ArgumentListNode* args, bool hasAssignments) { return new (m_parserArena) ArgumentsNode(args, hasAssignments); }

ArgumentListNode* createArgumentsList(const JSTokenLocation& location, ExpressionNode* arg) { return new (m_parserArena) ArgumentListNode(location, arg); }

ArgumentListNode* createArgumentsList(const JSTokenLocation& location, ArgumentListNode* args, ExpressionNode* arg) { return new (m_parserArena) ArgumentListNode(location, args, arg); }

NEVER_INLINE PropertyNode* createGetterOrSetterProperty(const JSTokenLocation& location, PropertyNode::Type type,

const Identifier* name, const ParserFunctionInfo<ASTBuilder>& functionInfo, ClassElementTag tag)

{

ASSERT(name);

functionInfo.body->setLoc(functionInfo.startLine, functionInfo.endLine, location.startOffset, location.lineStartOffset);

functionInfo.body->setEcmaName(*name);

SourceCode source = m_sourceCode->subExpression(functionInfo.startOffset, functionInfo.endOffset, functionInfo.startLine, functionInfo.parametersStartColumn);

MethodDefinitionNode* methodDef = new (m_parserArena) MethodDefinitionNode(location, m_vm.propertyNames->nullIdentifier, functionInfo.body, source);

return new (m_parserArena) PropertyNode(*name, methodDef, type, SuperBinding::Needed, tag);

}

NEVER_INLINE PropertyNode* createGetterOrSetterProperty(const JSTokenLocation& location, PropertyNode::Type type,

ExpressionNode* name, const ParserFunctionInfo<ASTBuilder>& functionInfo, ClassElementTag tag)

{

ASSERT(name);

functionInfo.body->setLoc(functionInfo.startLine, functionInfo.endLine, location.startOffset, location.lineStartOffset);

SourceCode source = m_sourceCode->subExpression(functionInfo.startOffset, functionInfo.endOffset, functionInfo.startLine, functionInfo.parametersStartColumn);

MethodDefinitionNode* methodDef = new (m_parserArena) MethodDefinitionNode(location, m_vm.propertyNames->nullIdentifier, functionInfo.body, source);

return new (m_parserArena) PropertyNode(name, methodDef, type, SuperBinding::Needed, tag);

}

NEVER_INLINE PropertyNode* createGetterOrSetterProperty(VM& vm, ParserArena& parserArena, const JSTokenLocation& location, PropertyNode::Type type,

double name, const ParserFunctionInfo<ASTBuilder>& functionInfo, ClassElementTag tag)

{

functionInfo.body->setLoc(functionInfo.startLine, functionInfo.endLine, location.startOffset, location.lineStartOffset);

const Identifier& ident = parserArena.identifierArena().makeNumericIdentifier(vm, name);

SourceCode source = m_sourceCode->subExpression(functionInfo.startOffset, functionInfo.endOffset, functionInfo.startLine, functionInfo.parametersStartColumn);

MethodDefinitionNode* methodDef = new (m_parserArena) MethodDefinitionNode(location, vm.propertyNames->nullIdentifier, functionInfo.body, source);

return new (m_parserArena) PropertyNode(ident, methodDef, type, SuperBinding::Needed, tag);

}

PropertyNode* createProperty(const Identifier* propertyName, ExpressionNode* node, PropertyNode::Type type, SuperBinding superBinding, InferName inferName, ClassElementTag tag)

{

if (inferName == InferName::Allowed) {

if (node->isBaseFuncExprNode()) {

auto metadata = static_cast<BaseFuncExprNode*>(node)->metadata();

metadata->setEcmaName(*propertyName);

} else if (node->isClassExprNode())

static_cast<ClassExprNode*>(node)->setEcmaName(*propertyName);

}

return new (m_parserArena) PropertyNode(*propertyName, node, type, superBinding, tag);

}

PropertyNode* createProperty(ExpressionNode* node, PropertyNode::Type type, SuperBinding superBinding, ClassElementTag tag)

{

return new (m_parserArena) PropertyNode(node, type, superBinding, tag);

}

PropertyNode* createProperty(VM& vm, ParserArena& parserArena, double propertyName, ExpressionNode* node, PropertyNode::Type type, SuperBinding superBinding, ClassElementTag tag)

{

return new (m_parserArena) PropertyNode(parserArena.identifierArena().makeNumericIdentifier(vm, propertyName), node, type, superBinding, tag);

}

PropertyNode* createProperty(ExpressionNode* propertyName, ExpressionNode* node, PropertyNode::Type type, SuperBinding superBinding, ClassElementTag tag) { return new (m_parserArena) PropertyNode(propertyName, node, type, superBinding, tag); }

PropertyNode* createProperty(const Identifier* identifier, ExpressionNode* propertyName, ExpressionNode* node, PropertyNode::Type type, SuperBinding superBinding, ClassElementTag tag) { return new (m_parserArena) PropertyNode(*identifier, propertyName, node, type, superBinding, tag); }

PropertyListNode* createPropertyList(const JSTokenLocation& location, PropertyNode* property) { return new (m_parserArena) PropertyListNode(location, property); }

PropertyListNode* createPropertyList(const JSTokenLocation& location, PropertyNode* property, PropertyListNode* tail) { return new (m_parserArena) PropertyListNode(location, property, tail); }

ElementNode* createElementList(int elisions, ExpressionNode* expr) { return new (m_parserArena) ElementNode(elisions, expr); }

ElementNode* createElementList(ElementNode* elems, int elisions, ExpressionNode* expr) { return new (m_parserArena) ElementNode(elems, elisions, expr); }

ElementNode* createElementList(ArgumentListNode* elems)

{

ElementNode* head = new (m_parserArena) ElementNode(0, elems->m_expr);

ElementNode* tail = head;

elems = elems->m_next;

while (elems) {

tail = new (m_parserArena) ElementNode(tail, 0, elems->m_expr);

elems = elems->m_next;

}

return head;

}

FormalParameterList createFormalParameterList() { return new (m_parserArena) FunctionParameters(); }

void appendParameter(FormalParameterList list, DestructuringPattern pattern, ExpressionNode* defaultValue)

{

list->append(pattern, defaultValue);

tryInferNameInPattern(pattern, defaultValue);

}

CaseClauseNode* createClause(ExpressionNode* expr, JSC::SourceElements* statements) { return new (m_parserArena) CaseClauseNode(expr, statements); }

ClauseListNode* createClauseList(CaseClauseNode* clause) { return new (m_parserArena) ClauseListNode(clause); }

ClauseListNode* createClauseList(ClauseListNode* tail, CaseClauseNode* clause) { return new (m_parserArena) ClauseListNode(tail, clause); }

StatementNode* createFuncDeclStatement(const JSTokenLocation& location, const ParserFunctionInfo<ASTBuilder>& functionInfo)

{

FuncDeclNode* decl = new (m_parserArena) FuncDeclNode(location, *functionInfo.name, functionInfo.body,

m_sourceCode->subExpression(functionInfo.startOffset, functionInfo.endOffset, functionInfo.startLine, functionInfo.parametersStartColumn));

if (*functionInfo.name == m_vm.propertyNames->arguments)

usesArguments();

functionInfo.body->setLoc(functionInfo.startLine, functionInfo.endLine, location.startOffset, location.lineStartOffset);

return decl;

}

StatementNode* createClassDeclStatement(const JSTokenLocation& location, ClassExprNode* classExpression,

const JSTextPosition& classStart, const JSTextPosition& classEnd, unsigned startLine, unsigned endLine)

{

ExpressionNode* assign = createAssignResolve(location, classExpression->name(), classExpression, classStart, classStart + 1, classEnd, AssignmentContext::DeclarationStatement);

ClassDeclNode* decl = new (m_parserArena) ClassDeclNode(location, assign);

decl->setLoc(startLine, endLine, location.startOffset, location.lineStartOffset);

return decl;

}

StatementNode* createBlockStatement(const JSTokenLocation& location, JSC::SourceElements* elements, int startLine, int endLine, VariableEnvironment&& lexicalVariables, DeclarationStacks::FunctionStack&& functionStack)

{

BlockNode* block = new (m_parserArena) BlockNode(location, elements, WTFMove(lexicalVariables), WTFMove(functionStack));

block->setLoc(startLine, endLine, location.startOffset, location.lineStartOffset);

return block;

}

StatementNode* createExprStatement(const JSTokenLocation& location, ExpressionNode* expr, const JSTextPosition& start, int end)

{

ExprStatementNode* result = new (m_parserArena) ExprStatementNode(location, expr);

result->setLoc(start.line, end, start.offset, start.lineStartOffset);

return result;

}

StatementNode* createIfStatement(const JSTokenLocation& location, ExpressionNode* condition, StatementNode* trueBlock, StatementNode* falseBlock, int start, int end)

{

IfElseNode* result = new (m_parserArena) IfElseNode(location, condition, trueBlock, falseBlock);

result->setLoc(start, end, location.startOffset, location.lineStartOffset);

return result;

}

StatementNode* createForLoop(const JSTokenLocation& location, ExpressionNode* initializer, ExpressionNode* condition, ExpressionNode* iter, StatementNode* statements, int start, int end, VariableEnvironment&& lexicalVariables)

{

ForNode* result = new (m_parserArena) ForNode(location, initializer, condition, iter, statements, WTFMove(lexicalVariables));

result->setLoc(start, end, location.startOffset, location.lineStartOffset);

return result;

}

StatementNode* createForInLoop(const JSTokenLocation& location, ExpressionNode* lhs, ExpressionNode* iter, StatementNode* statements, const JSTokenLocation&, const JSTextPosition& eStart, const JSTextPosition& eDivot, const JSTextPosition& eEnd, int start, int end, VariableEnvironment&& lexicalVariables)

{

ForInNode* result = new (m_parserArena) ForInNode(location, lhs, iter, statements, WTFMove(lexicalVariables));

result->setLoc(start, end, location.startOffset, location.lineStartOffset);

setExceptionLocation(result, eStart, eDivot, eEnd);

return result;

}

StatementNode* createForInLoop(const JSTokenLocation& location, DestructuringPatternNode* pattern, ExpressionNode* iter, StatementNode* statements, const JSTokenLocation& declLocation, const JSTextPosition& eStart, const JSTextPosition& eDivot, const JSTextPosition& eEnd, int start, int end, VariableEnvironment&& lexicalVariables)

{

auto lexpr = new (m_parserArena) DestructuringAssignmentNode(declLocation, pattern, nullptr);

return createForInLoop(location, lexpr, iter, statements, declLocation, eStart, eDivot, eEnd, start, end, WTFMove(lexicalVariables));

}

StatementNode* createForOfLoop(bool isForAwait, const JSTokenLocation& location, ExpressionNode* lhs, ExpressionNode* iter, StatementNode* statements, const JSTokenLocation&, const JSTextPosition& eStart, const JSTextPosition& eDivot, const JSTextPosition& eEnd, int start, int end, VariableEnvironment&& lexicalVariables)

{

ForOfNode* result = new (m_parserArena) ForOfNode(isForAwait, location, lhs, iter, statements, WTFMove(lexicalVariables));

result->setLoc(start, end, location.startOffset, location.lineStartOffset);

setExceptionLocation(result, eStart, eDivot, eEnd);

return result;

}

StatementNode* createForOfLoop(bool isForAwait, const JSTokenLocation& location, DestructuringPatternNode* pattern, ExpressionNode* iter, StatementNode* statements, const JSTokenLocation& declLocation, const JSTextPosition& eStart, const JSTextPosition& eDivot, const JSTextPosition& eEnd, int start, int end, VariableEnvironment&& lexicalVariables)

{

auto lexpr = new (m_parserArena) DestructuringAssignmentNode(declLocation, pattern, nullptr);

return createForOfLoop(isForAwait, location, lexpr, iter, statements, declLocation, eStart, eDivot, eEnd, start, end, WTFMove(lexicalVariables));

}

bool isBindingNode(const DestructuringPattern& pattern)

{

return pattern->isBindingNode();

}

bool isLocation(const Expression& node)

{

return node->isLocation();

}

bool isAssignmentLocation(const Expression& node)

{

return node->isAssignmentLocation();

}

bool isPrivateLocation(const Expression& node)

{

return node->isPrivateLocation();

}

bool isObjectLiteral(const Expression& node)

{

return node->isObjectLiteral();

}

bool isArrayLiteral(const Expression& node)

{

return node->isArrayLiteral();

}

bool isObjectOrArrayLiteral(const Expression& node)

{

return isObjectLiteral(node) || isArrayLiteral(node);

}

bool isFunctionCall(const Expression& node)

{

return node->isFunctionCall();

}

bool shouldSkipPauseLocation(StatementNode* statement) const

{

return !statement || statement->isLabel();

}

StatementNode* createEmptyStatement(const JSTokenLocation& location) { return new (m_parserArena) EmptyStatementNode(location); }

StatementNode* createDeclarationStatement(const JSTokenLocation& location, ExpressionNode* expr, int start, int end)

{

StatementNode* result;

result = new (m_parserArena) DeclarationStatement(location, expr);

result->setLoc(start, end, location.startOffset, location.lineStartOffset);

return result;

}

ExpressionNode* createEmptyVarExpression(const JSTokenLocation& location, const Identifier& identifier)

{

return new (m_parserArena) EmptyVarExpression(location, identifier);

}

ExpressionNode* createEmptyLetExpression(const JSTokenLocation& location, const Identifier& identifier)

{

return new (m_parserArena) EmptyLetExpression(location, identifier);

}

StatementNode* createReturnStatement(const JSTokenLocation& location, ExpressionNode* expression, const JSTextPosition& start, const JSTextPosition& end)

{

ReturnNode* result = new (m_parserArena) ReturnNode(location, expression);

setExceptionLocation(result, start, end, end);

result->setLoc(start.line, end.line, start.offset, start.lineStartOffset);

return result;

}

StatementNode* createBreakStatement(const JSTokenLocation& location, const Identifier* ident, const JSTextPosition& start, const JSTextPosition& end)

{

BreakNode* result = new (m_parserArena) BreakNode(location, *ident);

setExceptionLocation(result, start, end, end);

result->setLoc(start.line, end.line, start.offset, start.lineStartOffset);

return result;

}

StatementNode* createContinueStatement(const JSTokenLocation& location, const Identifier* ident, const JSTextPosition& start, const JSTextPosition& end)

{

ContinueNode* result = new (m_parserArena) ContinueNode(location, *ident);

setExceptionLocation(result, start, end, end);

result->setLoc(start.line, end.line, start.offset, start.lineStartOffset);

return result;

}

StatementNode* createTryStatement(const JSTokenLocation& location, StatementNode* tryBlock, DestructuringPatternNode* catchPattern, StatementNode* catchBlock, StatementNode* finallyBlock, int startLine, int endLine, VariableEnvironment&& catchEnvironment)

{

TryNode* result = new (m_parserArena) TryNode(location, tryBlock, catchPattern, catchBlock, WTFMove(catchEnvironment), finallyBlock);

result->setLoc(startLine, endLine, location.startOffset, location.lineStartOffset);

return result;

}

StatementNode* createSwitchStatement(const JSTokenLocation& location, ExpressionNode* expr, ClauseListNode* firstClauses, CaseClauseNode* defaultClause, ClauseListNode* secondClauses, int startLine, int endLine, VariableEnvironment&& lexicalVariables, DeclarationStacks::FunctionStack&& functionStack)

{

CaseBlockNode* cases = new (m_parserArena) CaseBlockNode(firstClauses, defaultClause, secondClauses);

SwitchNode* result = new (m_parserArena) SwitchNode(location, expr, cases, WTFMove(lexicalVariables), WTFMove(functionStack));

result->setLoc(startLine, endLine, location.startOffset, location.lineStartOffset);

return result;

}

StatementNode* createWhileStatement(const JSTokenLocation& location, ExpressionNode* expr, StatementNode* statement, int startLine, int endLine)

{

WhileNode* result = new (m_parserArena) WhileNode(location, expr, statement);

result->setLoc(startLine, endLine, location.startOffset, location.lineStartOffset);

return result;

}

StatementNode* createDoWhileStatement(const JSTokenLocation& location, StatementNode* statement, ExpressionNode* expr, int startLine, int endLine)

{

DoWhileNode* result = new (m_parserArena) DoWhileNode(location, statement, expr);

result->setLoc(startLine, endLine, location.startOffset, location.lineStartOffset);

return result;

}

StatementNode* createLabelStatement(const JSTokenLocation& location, const Identifier* ident, StatementNode* statement, const JSTextPosition& start, const JSTextPosition& end)

{

LabelNode* result = new (m_parserArena) LabelNode(location, *ident, statement);

setExceptionLocation(result, start, end, end);

return result;

}

StatementNode* createWithStatement(const JSTokenLocation& location, ExpressionNode* expr, StatementNode* statement, unsigned start, const JSTextPosition& end, unsigned startLine, unsigned endLine)

{

usesWith();

WithNode* result = new (m_parserArena) WithNode(location, expr, statement, end, end - start);

result->setLoc(startLine, endLine, location.startOffset, location.lineStartOffset);

return result;

}

StatementNode* createThrowStatement(const JSTokenLocation& location, ExpressionNode* expr, const JSTextPosition& start, const JSTextPosition& end)

{

ThrowNode* result = new (m_parserArena) ThrowNode(location, expr);

result->setLoc(start.line, end.line, start.offset, start.lineStartOffset);

setExceptionLocation(result, start, end, end);

return result;

}

StatementNode* createDebugger(const JSTokenLocation& location, int startLine, int endLine)

{

DebuggerStatementNode* result = new (m_parserArena) DebuggerStatementNode(location);

result->setLoc(startLine, endLine, location.startOffset, location.lineStartOffset);

return result;

}

ModuleNameNode* createModuleName(const JSTokenLocation& location, const Identifier& moduleName)

{

return new (m_parserArena) ModuleNameNode(location, moduleName);

}

ImportSpecifierNode* createImportSpecifier(const JSTokenLocation& location, const Identifier& importedName, const Identifier& localName)

{

return new (m_parserArena) ImportSpecifierNode(location, importedName, localName);

}

ImportSpecifierListNode* createImportSpecifierList()

{

return new (m_parserArena) ImportSpecifierListNode();

}

void appendImportSpecifier(ImportSpecifierListNode* specifierList, ImportSpecifierNode* specifier)

{

specifierList->append(specifier);

}

StatementNode* createImportDeclaration(const JSTokenLocation& location, ImportSpecifierListNode* importSpecifierList, ModuleNameNode* moduleName)

{

return new (m_parserArena) ImportDeclarationNode(location, importSpecifierList, moduleName);

}

StatementNode* createExportAllDeclaration(const JSTokenLocation& location, ModuleNameNode* moduleName)

{

return new (m_parserArena) ExportAllDeclarationNode(location, moduleName);

}

StatementNode* createExportDefaultDeclaration(const JSTokenLocation& location, StatementNode* declaration, const Identifier& localName)

{

return new (m_parserArena) ExportDefaultDeclarationNode(location, declaration, localName);

}

StatementNode* createExportLocalDeclaration(const JSTokenLocation& location, StatementNode* declaration)

{

return new (m_parserArena) ExportLocalDeclarationNode(location, declaration);

}

StatementNode* createExportNamedDeclaration(const JSTokenLocation& location, ExportSpecifierListNode* exportSpecifierList, ModuleNameNode* moduleName)

{

return new (m_parserArena) ExportNamedDeclarationNode(location, exportSpecifierList, moduleName);

}

ExportSpecifierNode* createExportSpecifier(const JSTokenLocation& location, const Identifier& localName, const Identifier& exportedName)

{

return new (m_parserArena) ExportSpecifierNode(location, localName, exportedName);

}

ExportSpecifierListNode* createExportSpecifierList()

{

return new (m_parserArena) ExportSpecifierListNode();

}

void appendExportSpecifier(ExportSpecifierListNode* specifierList, ExportSpecifierNode* specifier)

{

specifierList->append(specifier);

}

void appendStatement(JSC::SourceElements* elements, JSC::StatementNode* statement)

{

elements->append(statement);

}

CommaNode* createCommaExpr(const JSTokenLocation& location, ExpressionNode* node)

{

return new (m_parserArena) CommaNode(location, node);

}

CommaNode* appendToCommaExpr(const JSTokenLocation& location, ExpressionNode*, ExpressionNode* tail, ExpressionNode* next)

{

ASSERT(tail->isCommaNode());

ASSERT(next);

CommaNode* newTail = new (m_parserArena) CommaNode(location, next);

static_cast<CommaNode*>(tail)->setNext(newTail);

return newTail;

}

int evalCount() const { return m_evalCount; }

void appendBinaryExpressionInfo(int& operandStackDepth, ExpressionNode* current, const JSTextPosition& exprStart, const JSTextPosition& lhs, const JSTextPosition& rhs, bool hasAssignments)

{

operandStackDepth++;

m_binaryOperandStack.append(std::make_pair(current, BinaryOpInfo(exprStart, lhs, rhs, hasAssignments)));

}

// Logic to handle datastructures used during parsing of binary expressions

void operatorStackPop(int& operatorStackDepth)

{

operatorStackDepth--;

m_binaryOperatorStack.removeLast();

}

bool operatorStackShouldReduce(int precedence)

{

// If the current precedence of the operator stack is the same to the one of the given operator,

// it depends on the associative whether we reduce the stack.

// If the operator is right associative, we should not reduce the stack right now.

if (precedence == m_binaryOperatorStack.last().second)

return !(m_binaryOperatorStack.last().first & RightAssociativeBinaryOpTokenFlag);

return precedence < m_binaryOperatorStack.last().second;

}

const BinaryOperand& getFromOperandStack(int i) { return m_binaryOperandStack[m_binaryOperandStack.size() + i]; }

void shrinkOperandStackBy(int& operandStackDepth, int amount)

{

operandStackDepth -= amount;

ASSERT(operandStackDepth >= 0);

m_binaryOperandStack.shrink(m_binaryOperandStack.size() - amount);

}

void appendBinaryOperation(const JSTokenLocation& location, int& operandStackDepth, int&, const BinaryOperand& lhs, const BinaryOperand& rhs)

{

operandStackDepth++;

m_binaryOperandStack.append(std::make_pair(makeBinaryNode(location, m_binaryOperatorStack.last().first, lhs, rhs), BinaryOpInfo(lhs.second, rhs.second)));

}

void operatorStackAppend(int& operatorStackDepth, int op, int precedence)

{

operatorStackDepth++;

m_binaryOperatorStack.append(std::make_pair(op, precedence));

}

ExpressionNode* popOperandStack(int&)

{

ExpressionNode* result = m_binaryOperandStack.last().first;

m_binaryOperandStack.removeLast();

return result;

}

void appendUnaryToken(int& tokenStackDepth, int type, const JSTextPosition& start)

{

tokenStackDepth++;

m_unaryTokenStack.append(std::make_pair(type, start));

}

int unaryTokenStackLastType(int&)

{

return m_unaryTokenStack.last().first;

}

const JSTextPosition& unaryTokenStackLastStart(int&)

{

return m_unaryTokenStack.last().second;

}

void unaryTokenStackRemoveLast(int& tokenStackDepth)

{

tokenStackDepth--;

m_unaryTokenStack.removeLast();

}

int unaryTokenStackDepth() const

{

return m_unaryTokenStack.size();

}

void setUnaryTokenStackDepth(int oldDepth)

{

m_unaryTokenStack.shrink(oldDepth);

}

void assignmentStackAppend(int& assignmentStackDepth, ExpressionNode* node, const JSTextPosition& start, const JSTextPosition& divot, int assignmentCount, Operator op)

{

assignmentStackDepth++;

ASSERT(start.offset >= start.lineStartOffset);

ASSERT(divot.offset >= divot.lineStartOffset);

m_assignmentInfoStack.append(AssignmentInfo(node, start, divot, assignmentCount, op));

}

ExpressionNode* createAssignment(const JSTokenLocation& location, int& assignmentStackDepth, ExpressionNode* rhs, int initialAssignmentCount, int currentAssignmentCount, const JSTextPosition& lastTokenEnd)

{

AssignmentInfo& info = m_assignmentInfoStack.last();

ExpressionNode* result = makeAssignNode(location, info.m_node, info.m_op, rhs, info.m_initAssignments != initialAssignmentCount, info.m_initAssignments != currentAssignmentCount, info.m_start, info.m_divot + 1, lastTokenEnd);

m_assignmentInfoStack.removeLast();

assignmentStackDepth--;

return result;

}

PropertyNode::Type getType(const Property& property) const { return property->type(); }

bool isUnderscoreProtoSetter(const Property& property) const { return PropertyNode::isUnderscoreProtoSetter(m_vm, *property); }

bool isResolve(ExpressionNode* expr) const { return expr->isResolveNode(); }

ExpressionNode* createDestructuringAssignment(const JSTokenLocation& location, DestructuringPattern pattern, ExpressionNode* initializer)

{

return new (m_parserArena) DestructuringAssignmentNode(location, pattern, initializer);

}

ArrayPattern createArrayPattern(const JSTokenLocation&)

{

return new (m_parserArena) ArrayPatternNode();

}

void appendArrayPatternSkipEntry(ArrayPattern node, const JSTokenLocation& location)

{

node->appendIndex(ArrayPatternNode::BindingType::Elision, location, nullptr, nullptr);

}

void appendArrayPatternEntry(ArrayPattern node, const JSTokenLocation& location, DestructuringPattern pattern, ExpressionNode* defaultValue)

{

node->appendIndex(ArrayPatternNode::BindingType::Element, location, pattern, defaultValue);

tryInferNameInPattern(pattern, defaultValue);

}

void appendArrayPatternRestEntry(ArrayPattern node, const JSTokenLocation& location, DestructuringPattern pattern)

{

node->appendIndex(ArrayPatternNode::BindingType::RestElement, location, pattern, nullptr);

}

void finishArrayPattern(ArrayPattern node, const JSTextPosition& divotStart, const JSTextPosition& divot, const JSTextPosition& divotEnd)

{