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/*
* 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 "Lexer.h"
#include "ParserFunctionInfo.h"
#include "YarrSyntaxChecker.h"
namespace JSC {
class SyntaxChecker {
public:
struct BinaryExprContext {
BinaryExprContext(SyntaxChecker& context)
: m_context(&context)
{
m_token = m_context->m_topBinaryExpr;
m_context->m_topBinaryExpr = 0;
}
~BinaryExprContext()
{
m_context->m_topBinaryExpr = m_token;
}
private:
int m_token;
SyntaxChecker* m_context;
};
struct UnaryExprContext {
UnaryExprContext(SyntaxChecker& context)
: m_context(&context)
{
m_token = m_context->m_topUnaryToken;
m_context->m_topUnaryToken = 0;
}
~UnaryExprContext()
{
m_context->m_topUnaryToken = m_token;
}
private:
int m_token;
SyntaxChecker* m_context;
};
SyntaxChecker(VM& , void*)
{
}
static const constexpr int MetaPropertyBit = 0x80000000;
enum : int { NoneExpr = 0,
ResolveEvalExpr, ResolveExpr, IntegerExpr, DoubleExpr, StringExpr, BigIntExpr,
ThisExpr, NullExpr, BoolExpr, RegExpExpr, ObjectLiteralExpr,
FunctionExpr, ClassExpr, SuperExpr, ImportExpr, BracketExpr, DotExpr, CallExpr,
NewExpr, PreExpr, PostExpr, UnaryExpr, BinaryExpr, OptionalChain,
ConditionalExpr, AssignmentExpr, TypeofExpr,
DeleteExpr, ArrayLiteralExpr, BindingDestructuring, RestParameter,
ArrayDestructuring, ObjectDestructuring, SourceElementsResult,
FunctionBodyResult, SpreadExpr, ObjectSpreadExpr, ArgumentsResult,
PropertyListResult, ArgumentsListResult, ElementsListResult,
StatementResult, FormalParameterListResult, ClauseResult,
ClauseListResult, CommaExpr, DestructuringAssignment,
TemplateStringResult, TemplateStringListResult,
TemplateExpressionListResult, TemplateExpr,
TaggedTemplateExpr, YieldExpr, AwaitExpr,
ModuleNameResult,
ImportSpecifierResult, ImportSpecifierListResult,
ExportSpecifierResult, ExportSpecifierListResult,
NewTargetExpr = MetaPropertyBit | 0,
ImportMetaExpr = MetaPropertyBit | 1,
};
typedef int ExpressionType;
typedef ExpressionType Expression;
typedef int SourceElements;
typedef int Arguments;
typedef ExpressionType Comma;
struct Property {
ALWAYS_INLINE Property(void* = 0)
: type((PropertyNode::Type)0)
{
}
ALWAYS_INLINE Property(const Identifier* ident, PropertyNode::Type ty)
: name(ident)
, type(ty)
{
}
ALWAYS_INLINE Property(PropertyNode::Type ty)
: name(0)
, type(ty)
{
}
ALWAYS_INLINE bool operator!() { return !type; }
const Identifier* name;
PropertyNode::Type type;
};
typedef int PropertyList;
typedef int ElementList;
typedef int ArgumentsList;
typedef int TemplateExpressionList;
typedef int TemplateString;
typedef int TemplateStringList;
typedef int TemplateLiteral;
typedef int FormalParameterList;
typedef int FunctionBody;
typedef int ClassExpression;
typedef int ModuleName;
typedef int ImportSpecifier;
typedef int ImportSpecifierList;
typedef int ExportSpecifier;
typedef int ExportSpecifierList;
typedef int Statement;
typedef int ClauseList;
typedef int Clause;
typedef int BinaryOperand;
typedef int DestructuringPattern;
typedef DestructuringPattern ArrayPattern;
typedef DestructuringPattern ObjectPattern;
typedef DestructuringPattern RestPattern;
static constexpr bool CreatesAST = false;
static constexpr bool NeedsFreeVariableInfo = false;
static constexpr bool CanUseFunctionCache = true;
static constexpr unsigned DontBuildKeywords = LexexFlagsDontBuildKeywords;
static constexpr unsigned DontBuildStrings = LexerFlagsDontBuildStrings;
int createSourceElements() { return SourceElementsResult; }
ExpressionType makeFunctionCallNode(const JSTokenLocation&, ExpressionType, bool, int, int, int, int, size_t, bool) { return CallExpr; }
ExpressionType createCommaExpr(const JSTokenLocation&, ExpressionType expr) { return expr; }
ExpressionType appendToCommaExpr(const JSTokenLocation&, ExpressionType& head, ExpressionType, ExpressionType next) { head = next; return next; }
ExpressionType makeAssignNode(const JSTokenLocation&, ExpressionType, Operator, ExpressionType, bool, bool, int, int, int) { return AssignmentExpr; }
ExpressionType makePrefixNode(const JSTokenLocation&, ExpressionType, Operator, int, int, int) { return PreExpr; }
ExpressionType makePostfixNode(const JSTokenLocation&, ExpressionType, Operator, int, int, int) { return PostExpr; }
ExpressionType makeTypeOfNode(const JSTokenLocation&, ExpressionType) { return TypeofExpr; }
ExpressionType makeDeleteNode(const JSTokenLocation&, ExpressionType, int, int, int) { return DeleteExpr; }
ExpressionType makeNegateNode(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
ExpressionType makeBitwiseNotNode(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
ExpressionType createLogicalNot(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
ExpressionType createUnaryPlus(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
ExpressionType createVoid(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
ExpressionType createImportExpr(const JSTokenLocation&, ExpressionType, int, int, int) { return ImportExpr; }
ExpressionType createThisExpr(const JSTokenLocation&) { return ThisExpr; }
ExpressionType createSuperExpr(const JSTokenLocation&) { return SuperExpr; }
ExpressionType createNewTargetExpr(const JSTokenLocation&) { return NewTargetExpr; }
ExpressionType createImportMetaExpr(const JSTokenLocation&, ExpressionType) { return ImportMetaExpr; }
ALWAYS_INLINE bool isMetaProperty(ExpressionType type) { return type & MetaPropertyBit; }
ALWAYS_INLINE bool isNewTarget(ExpressionType type) { return type == NewTargetExpr; }
ALWAYS_INLINE bool isImportMeta(ExpressionType type) { return type == ImportMetaExpr; }
ExpressionType createResolve(const JSTokenLocation&, const Identifier&, int, int) { return ResolveExpr; }
ExpressionType createObjectLiteral(const JSTokenLocation&) { return ObjectLiteralExpr; }
ExpressionType createObjectLiteral(const JSTokenLocation&, int) { return ObjectLiteralExpr; }
ExpressionType createArray(const JSTokenLocation&, int) { return ArrayLiteralExpr; }
ExpressionType createArray(const JSTokenLocation&, int, int) { return ArrayLiteralExpr; }
ExpressionType createDoubleExpr(const JSTokenLocation&, double) { return DoubleExpr; }
ExpressionType createIntegerExpr(const JSTokenLocation&, double) { return IntegerExpr; }
ExpressionType createBigInt(const JSTokenLocation&, const Identifier*, int) { return BigIntExpr; }
ExpressionType createString(const JSTokenLocation&, const Identifier*) { return StringExpr; }
ExpressionType createBoolean(const JSTokenLocation&, bool) { return BoolExpr; }
ExpressionType createNull(const JSTokenLocation&) { return NullExpr; }
ExpressionType createBracketAccess(const JSTokenLocation&, ExpressionType, ExpressionType, bool, int, int, int) { return BracketExpr; }
ExpressionType createDotAccess(const JSTokenLocation&, ExpressionType, const Identifier*, int, int, int) { return DotExpr; }
ExpressionType createRegExp(const JSTokenLocation&, const Identifier& pattern, const Identifier& flags, int) { return Yarr::hasError(Yarr::checkSyntax(pattern.string(), flags.string())) ? 0 : RegExpExpr; }
ExpressionType createNewExpr(const JSTokenLocation&, ExpressionType, int, int, int, int) { return NewExpr; }
ExpressionType createNewExpr(const JSTokenLocation&, ExpressionType, int, int) { return NewExpr; }
ExpressionType createOptionalChain(const JSTokenLocation&, ExpressionType, ExpressionType, bool) { return OptionalChain; }
ExpressionType createConditionalExpr(const JSTokenLocation&, ExpressionType, ExpressionType, ExpressionType) { return ConditionalExpr; }
ExpressionType createAssignResolve(const JSTokenLocation&, const Identifier&, ExpressionType, int, int, int, AssignmentContext) { return AssignmentExpr; }
ExpressionType createEmptyVarExpression(const JSTokenLocation&, const Identifier&) { return AssignmentExpr; }
ExpressionType createEmptyLetExpression(const JSTokenLocation&, const Identifier&) { return AssignmentExpr; }
ExpressionType createYield(const JSTokenLocation&) { return YieldExpr; }
ExpressionType createYield(const JSTokenLocation&, ExpressionType, bool, int, int, int) { return YieldExpr; }
ExpressionType createAwait(const JSTokenLocation&, ExpressionType, int, int, int) { return AwaitExpr; }
ClassExpression createClassExpr(const JSTokenLocation&, const ParserClassInfo<SyntaxChecker>&, VariableEnvironment&, ExpressionType, ExpressionType, PropertyList) { return ClassExpr; }
ExpressionType createFunctionExpr(const JSTokenLocation&, const ParserFunctionInfo<SyntaxChecker>&) { return FunctionExpr; }
ExpressionType createGeneratorFunctionBody(const JSTokenLocation&, const ParserFunctionInfo<SyntaxChecker>&, const Identifier&) { return FunctionExpr; }
ExpressionType createAsyncFunctionBody(const JSTokenLocation&, const ParserFunctionInfo<SyntaxChecker>&) { return FunctionExpr; }
int createFunctionMetadata(const JSTokenLocation&, const JSTokenLocation&, int, int, bool, int, int, int, ConstructorKind, SuperBinding, unsigned, SourceParseMode, bool, InnerArrowFunctionCodeFeatures = NoInnerArrowFunctionFeatures) { return FunctionBodyResult; }
ExpressionType createArrowFunctionExpr(const JSTokenLocation&, const ParserFunctionInfo<SyntaxChecker>&) { return FunctionExpr; }
ExpressionType createMethodDefinition(const JSTokenLocation&, const ParserFunctionInfo<SyntaxChecker>&) { return FunctionExpr; }
void setFunctionNameStart(int, int) { }
int createArguments() { return ArgumentsResult; }
int createArguments(int) { return ArgumentsResult; }
ExpressionType createSpreadExpression(const JSTokenLocation&, ExpressionType, int, int, int) { return SpreadExpr; }
ExpressionType createObjectSpreadExpression(const JSTokenLocation&, ExpressionType, int, int, int) { return ObjectSpreadExpr; }
TemplateString createTemplateString(const JSTokenLocation&, const Identifier*, const Identifier*) { return TemplateStringResult; }
TemplateStringList createTemplateStringList(TemplateString) { return TemplateStringListResult; }
TemplateStringList createTemplateStringList(TemplateStringList, TemplateString) { return TemplateStringListResult; }
TemplateExpressionList createTemplateExpressionList(Expression) { return TemplateExpressionListResult; }
TemplateExpressionList createTemplateExpressionList(TemplateExpressionList, Expression) { return TemplateExpressionListResult; }
TemplateLiteral createTemplateLiteral(const JSTokenLocation&, TemplateStringList) { return TemplateExpr; }
TemplateLiteral createTemplateLiteral(const JSTokenLocation&, TemplateStringList, TemplateExpressionList) { return TemplateExpr; }
ExpressionType createTaggedTemplate(const JSTokenLocation&, ExpressionType, TemplateLiteral, int, int, int) { return TaggedTemplateExpr; }
int createArgumentsList(const JSTokenLocation&, int) { return ArgumentsListResult; }
int createArgumentsList(const JSTokenLocation&, int, int) { return ArgumentsListResult; }
Property createProperty(const Identifier* name, int, PropertyNode::Type type, PropertyNode::PutType, bool complete, SuperBinding, InferName, ClassElementTag)
{
if (!complete)
return Property(type);
ASSERT(name);
return Property(name, type);
}
Property createProperty(int, PropertyNode::Type type, PropertyNode::PutType, bool, SuperBinding, ClassElementTag)
{
return Property(type);
}
Property createProperty(VM& vm, ParserArena& parserArena, double name, int, PropertyNode::Type type, PropertyNode::PutType, bool complete, SuperBinding, ClassElementTag)
{
if (!complete)
return Property(type);
return Property(&parserArena.identifierArena().makeNumericIdentifier(vm, name), type);
}
Property createProperty(int, int, PropertyNode::Type type, PropertyNode::PutType, bool, SuperBinding, ClassElementTag)
{
return Property(type);
}
int createPropertyList(const JSTokenLocation&, Property) { return PropertyListResult; }
int createPropertyList(const JSTokenLocation&, Property, int) { return PropertyListResult; }
int createElementList(int, int) { return ElementsListResult; }
int createElementList(int, int, int) { return ElementsListResult; }
int createElementList(int) { return ElementsListResult; }
int createFormalParameterList() { return FormalParameterListResult; }
void appendParameter(int, DestructuringPattern, int) { }
int createClause(int, int) { return ClauseResult; }
int createClauseList(int) { return ClauseListResult; }
int createClauseList(int, int) { return ClauseListResult; }
int createFuncDeclStatement(const JSTokenLocation&, const ParserFunctionInfo<SyntaxChecker>&) { return StatementResult; }
int createClassDeclStatement(const JSTokenLocation&, ClassExpression,
const JSTextPosition&, const JSTextPosition&, int, int) { return StatementResult; }
int createBlockStatement(const JSTokenLocation&, int, int, int, VariableEnvironment&, DeclarationStacks::FunctionStack&&) { return StatementResult; }
int createExprStatement(const JSTokenLocation&, int, int, int) { return StatementResult; }
int createIfStatement(const JSTokenLocation&, int, int, int, int) { return StatementResult; }
int createIfStatement(const JSTokenLocation&, int, int, int, int, int) { return StatementResult; }
int createForLoop(const JSTokenLocation&, int, int, int, int, int, int, VariableEnvironment&) { return StatementResult; }
int createForInLoop(const JSTokenLocation&, int, int, int, const JSTokenLocation&, int, int, int, int, int, VariableEnvironment&) { return StatementResult; }
int createForOfLoop(bool, const JSTokenLocation&, int, int, int, const JSTokenLocation&, int, int, int, int, int, VariableEnvironment&) { return StatementResult; }
int createEmptyStatement(const JSTokenLocation&) { return StatementResult; }
int createDeclarationStatement(const JSTokenLocation&, int, int, int) { return StatementResult; }
int createReturnStatement(const JSTokenLocation&, int, int, int) { return StatementResult; }
int createBreakStatement(const JSTokenLocation&, int, int) { return StatementResult; }
int createBreakStatement(const JSTokenLocation&, const Identifier*, int, int) { return StatementResult; }
int createContinueStatement(const JSTokenLocation&, int, int) { return StatementResult; }
int createContinueStatement(const JSTokenLocation&, const Identifier*, int, int) { return StatementResult; }
int createTryStatement(const JSTokenLocation&, int, int, int, int, int, int, VariableEnvironment&) { return StatementResult; }
int createSwitchStatement(const JSTokenLocation&, int, int, int, int, int, int, VariableEnvironment&, DeclarationStacks::FunctionStack&&) { return StatementResult; }
int createWhileStatement(const JSTokenLocation&, int, int, int, int) { return StatementResult; }
int createWithStatement(const JSTokenLocation&, int, int, int, int, int, int) { return StatementResult; }
int createDoWhileStatement(const JSTokenLocation&, int, int, int, int) { return StatementResult; }
int createLabelStatement(const JSTokenLocation&, const Identifier*, int, int, int) { return StatementResult; }
int createThrowStatement(const JSTokenLocation&, int, int, int) { return StatementResult; }
int createDebugger(const JSTokenLocation&, int, int) { return StatementResult; }
int createConstStatement(const JSTokenLocation&, int, int, int) { return StatementResult; }
int createModuleName(const JSTokenLocation&, const Identifier&) { return ModuleNameResult; }
ImportSpecifier createImportSpecifier(const JSTokenLocation&, const Identifier&, const Identifier&) { return ImportSpecifierResult; }
ImportSpecifierList createImportSpecifierList() { return ImportSpecifierListResult; }
void appendImportSpecifier(ImportSpecifierList, ImportSpecifier) { }
int createImportDeclaration(const JSTokenLocation&, ImportSpecifierList, ModuleName) { return StatementResult; }
int createExportAllDeclaration(const JSTokenLocation&, ModuleName) { return StatementResult; }
int createExportDefaultDeclaration(const JSTokenLocation&, int, const Identifier&) { return StatementResult; }
int createExportLocalDeclaration(const JSTokenLocation&, int) { return StatementResult; }
int createExportNamedDeclaration(const JSTokenLocation&, ExportSpecifierList, ModuleName) { return StatementResult; }
ExportSpecifier createExportSpecifier(const JSTokenLocation&, const Identifier&, const Identifier&) { return ExportSpecifierResult; }
ExportSpecifierList createExportSpecifierList() { return ExportSpecifierListResult; }
void appendExportSpecifier(ExportSpecifierList, ExportSpecifier) { }
int appendConstDecl(const JSTokenLocation&, int, const Identifier*, int) { return StatementResult; }
Property createGetterOrSetterProperty(const JSTokenLocation&, PropertyNode::Type type, bool strict, const Identifier* name, const ParserFunctionInfo<SyntaxChecker>&, ClassElementTag)
{
ASSERT(name);
if (!strict)
return Property(type);
return Property(name, type);
}
Property createGetterOrSetterProperty(const JSTokenLocation&, PropertyNode::Type type, bool, int, const ParserFunctionInfo<SyntaxChecker>&, ClassElementTag)
{
return Property(type);
}
Property createGetterOrSetterProperty(VM& vm, ParserArena& parserArena, const JSTokenLocation&, PropertyNode::Type type, bool strict, double name, const ParserFunctionInfo<SyntaxChecker>&, ClassElementTag)
{
if (!strict)
return Property(type);
return Property(&parserArena.identifierArena().makeNumericIdentifier(vm, name), type);
}
void appendStatement(int, int) { }
int combineCommaNodes(const JSTokenLocation&, int, int) { return CommaExpr; }
int evalCount() const { return 0; }
void appendBinaryExpressionInfo(int& operandStackDepth, int expr, int, int, int, bool)
{
if (!m_topBinaryExpr)
m_topBinaryExpr = expr;
else
m_topBinaryExpr = BinaryExpr;
operandStackDepth++;
}
// Logic to handle datastructures used during parsing of binary expressions
void operatorStackPop(int& operatorStackDepth) { operatorStackDepth--; }
bool operatorStackShouldReduce(int) { return true; }
BinaryOperand getFromOperandStack(int) { return m_topBinaryExpr; }
void shrinkOperandStackBy(int& operandStackDepth, int amount) { operandStackDepth -= amount; }
void appendBinaryOperation(const JSTokenLocation&, int& operandStackDepth, int&, BinaryOperand, BinaryOperand) { operandStackDepth++; }
void operatorStackAppend(int& operatorStackDepth, int, int) { operatorStackDepth++; }
int popOperandStack(int&) { int res = m_topBinaryExpr; m_topBinaryExpr = 0; return res; }
void appendUnaryToken(int& stackDepth, int tok, int) { stackDepth = 1; m_topUnaryToken = tok; }
int unaryTokenStackLastType(int&) { return m_topUnaryToken; }
JSTextPosition unaryTokenStackLastStart(int&) { return JSTextPosition(0, 0, 0); }
void unaryTokenStackRemoveLast(int& stackDepth) { stackDepth = 0; }
void assignmentStackAppend(int, int, int, int, int, Operator) { }
int createAssignment(const JSTokenLocation&, int, int, int, int, int) { RELEASE_ASSERT_NOT_REACHED(); return AssignmentExpr; }
const Identifier* getName(const Property& property) const { return property.name; }
PropertyNode::Type getType(const Property& property) const { return property.type; }
bool isResolve(ExpressionType expr) const { return expr == ResolveExpr || expr == ResolveEvalExpr; }
ExpressionType createDestructuringAssignment(const JSTokenLocation&, int, ExpressionType)
{
return DestructuringAssignment;
}
ArrayPattern createArrayPattern(const JSTokenLocation&)
{
return ArrayDestructuring;
}
void appendArrayPatternSkipEntry(ArrayPattern, const JSTokenLocation&)
{
}
void appendArrayPatternEntry(ArrayPattern, const JSTokenLocation&, DestructuringPattern, int)
{
}
void appendArrayPatternRestEntry(ArrayPattern, const JSTokenLocation&, DestructuringPattern)
{
}
void finishArrayPattern(ArrayPattern, const JSTextPosition&, const JSTextPosition&, const JSTextPosition&)
{
}
ObjectPattern createObjectPattern(const JSTokenLocation&)
{
return ObjectDestructuring;
}
void appendObjectPatternEntry(ObjectPattern, const JSTokenLocation&, bool, const Identifier&, DestructuringPattern, int)
{
}
void appendObjectPatternEntry(VM&, ObjectPattern, const JSTokenLocation&, Expression, DestructuringPattern, Expression)
{
}
void appendObjectPatternRestEntry(VM&, ObjectPattern, const JSTokenLocation&, DestructuringPattern)
{
}
void setContainsObjectRestElement(ObjectPattern, bool)
{
}
void setContainsComputedProperty(ObjectPattern, bool)
{
}
DestructuringPattern createBindingLocation(const JSTokenLocation&, const Identifier&, const JSTextPosition&, const JSTextPosition&, AssignmentContext)
{
return BindingDestructuring;
}
RestPattern createRestParameter(DestructuringPattern, size_t)
{
return RestParameter;
}
DestructuringPattern createAssignmentElement(const Expression&, const JSTextPosition&, const JSTextPosition&)
{
return BindingDestructuring;
}
bool isBindingNode(DestructuringPattern pattern)
{
return pattern == BindingDestructuring;
}
bool isLocation(ExpressionType type)
{
return type == ResolveExpr || type == DotExpr || type == BracketExpr;
}
bool isAssignmentLocation(ExpressionType type)
{
return isLocation(type) || type == DestructuringAssignment;
}
bool isObjectLiteral(ExpressionType type)
{
return type == ObjectLiteralExpr;
}
bool isArrayLiteral(ExpressionType type)
{
return type == ArrayLiteralExpr;
}
bool isObjectOrArrayLiteral(ExpressionType type)
{
return isObjectLiteral(type) || isArrayLiteral(type);
}
bool isFunctionCall(ExpressionType type)
{
return type == CallExpr;
}
bool shouldSkipPauseLocation(int) const { return true; }
void setEndOffset(int, int) { }
int endOffset(int) { return 0; }
void setStartOffset(int, int) { }
JSTextPosition breakpointLocation(int) { return JSTextPosition(-1, 0, 0); }
void propagateArgumentsUse() { }
private:
int m_topBinaryExpr;
int m_topUnaryToken;
};
} // namespace JSC