qv4symbol.cpp - mozsearch

// Copyright (C) 2018 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

// Qt-Security score:significant

#include <qv4symbol_p.h>

#include <qv4functionobject_p.h>

#include <qv4identifiertable_p.h>

using namespace QV4;

DEFINE_OBJECT_VTABLE(SymbolCtor);

DEFINE_MANAGED_VTABLE(Symbol);

DEFINE_OBJECT_VTABLE(SymbolObject);

void Heap::Symbol::init(const QString &s)

    Q_ASSERT(s.at(0) == QLatin1Char('@'));

    QString desc(s);

    StringOrSymbol::init(desc.data_ptr());

    identifier = PropertyKey::fromStringOrSymbol(internalClass->engine, this);

void Heap::SymbolCtor::init(QV4::ExecutionEngine *engine)

    Heap::FunctionObject::init(engine, QStringLiteral("Symbol"));

void Heap::SymbolObject::init(const QV4::Symbol *s)

    Object::init();

    symbol.set(internalClass->engine, s->d());

ReturnedValue QV4::SymbolCtor::virtualCall(const QV4::FunctionObject *f, const QV4::Value *, const QV4::Value *argv, int argc)

    Scope scope(f);

    QString desc = QChar::fromLatin1('@');

    if (argc && !argv[0].isUndefined()) {

        ScopedString s(scope, argv[0].toString(scope.engine));

        if (scope.hasException())

            return Encode::undefined();

        desc += s->toQString();

    return Symbol::create(scope.engine, desc)->asReturnedValue();

ReturnedValue SymbolCtor::virtualCallAsConstructor(const FunctionObject *f, const Value *, int, const Value *)

    return f->engine()->throwTypeError(QStringLiteral("Symbol can't be used together with |new|."));

ReturnedValue SymbolCtor::method_for(const FunctionObject *f, const Value *, const Value *argv, int argc)

    Scope scope(f);

    ScopedValue k(scope, argc ? argv[0] : Value::undefinedValue());

    ScopedString key(scope, k->toString(scope.engine));

    if (scope.hasException())

        return Encode::undefined();

    QString desc = QLatin1Char('@') + key->toQString();

    return scope.engine->identifierTable->insertSymbol(desc)->asReturnedValue();

ReturnedValue SymbolCtor::method_keyFor(const FunctionObject *f, const Value *, const Value *argv, int argc)

    ExecutionEngine *e = f->engine();

    if (!argc || !argv[0].isSymbol())

        return e->throwTypeError(QLatin1String("Symbol.keyFor: Argument is not a symbol."));

    const Symbol &arg = static_cast<const Symbol &>(argv[0]);

    Heap::Symbol *s = e->identifierTable->symbolForId(arg.propertyKey());

    Q_ASSERT(!s || s == arg.d());

    if (s)

        return e->newString(arg.toQString().mid((1)))->asReturnedValue();

    return Encode::undefined();

void SymbolPrototype::init(ExecutionEngine *engine, Object *ctor)

    Scope scope(engine);

    ScopedValue v(scope);

    ctor->defineReadonlyProperty(engine->id_prototype(), (v = this));

    ctor->defineReadonlyConfigurableProperty(engine->id_length(), Value::fromInt32(0));

    ctor->defineDefaultProperty(QStringLiteral("for"), SymbolCtor::method_for, 1);

    ctor->defineDefaultProperty(QStringLiteral("keyFor"), SymbolCtor::method_keyFor, 1);

    ctor->defineReadonlyProperty(QStringLiteral("hasInstance"), *engine->symbol_hasInstance());

    ctor->defineReadonlyProperty(QStringLiteral("isConcatSpreadable"), *engine->symbol_isConcatSpreadable());

    ctor->defineReadonlyProperty(QStringLiteral("iterator"), *engine->symbol_iterator());

    ctor->defineReadonlyProperty(QStringLiteral("match"), *engine->symbol_match());

    ctor->defineReadonlyProperty(QStringLiteral("replace"), *engine->symbol_replace());

    ctor->defineReadonlyProperty(QStringLiteral("search"), *engine->symbol_search());

    ctor->defineReadonlyProperty(QStringLiteral("species"), *engine->symbol_species());

    ctor->defineReadonlyProperty(QStringLiteral("split"), *engine->symbol_split());

    ctor->defineReadonlyProperty(QStringLiteral("toPrimitive"), *engine->symbol_toPrimitive());

    ctor->defineReadonlyProperty(QStringLiteral("toStringTag"), *engine->symbol_toStringTag());

    ctor->defineReadonlyProperty(QStringLiteral("unscopables"), *engine->symbol_unscopables());

    defineDefaultProperty(QStringLiteral("constructor"), (v = ctor));

    defineDefaultProperty(QStringLiteral("toString"), method_toString);

    defineDefaultProperty(QStringLiteral("valueOf"), method_valueOf);

    defineDefaultProperty(engine->symbol_toPrimitive(), method_symbolToPrimitive, 1, Attr_ReadOnly_ButConfigurable);

    v = engine->newString(QStringLiteral("Symbol"));

    defineReadonlyConfigurableProperty(engine->symbol_toStringTag(), v);

ReturnedValue SymbolPrototype::method_toString(const FunctionObject *f, const Value *thisObject, const Value *, int)

    Scope scope(f);

    Scoped<Symbol> s(scope, thisObject->as<Symbol>());

    if (!s) {

        if (const SymbolObject *o = thisObject->as<SymbolObject>())

            s = o->d()->symbol;

        else

            return scope.engine->throwTypeError();

    return scope.engine->newString(s->descriptiveString())->asReturnedValue();

ReturnedValue SymbolPrototype::method_valueOf(const FunctionObject *f, const Value *thisObject, const Value *, int)

    Scope scope(f);

    Scoped<Symbol> s(scope, thisObject->as<Symbol>());

    if (!s) {

        if (const SymbolObject *o = thisObject->as<SymbolObject>())

            s = o->d()->symbol;

        else

            return scope.engine->throwTypeError();

    return s->asReturnedValue();

ReturnedValue SymbolPrototype::method_symbolToPrimitive(const FunctionObject *f, const Value *thisObject, const Value *, int)

    if (thisObject->isSymbol())

        return thisObject->asReturnedValue();

    if (const SymbolObject *o = thisObject->as<SymbolObject>())

        return o->d()->symbol->asReturnedValue();

    return f->engine()->throwTypeError();

Heap::Symbol *Symbol::create(ExecutionEngine *e, const QString &s)

    Q_ASSERT(s.at(0) == QLatin1Char('@'));

    return e->memoryManager->alloc<Symbol>(s);

QString Symbol::descriptiveString() const

    return QLatin1String("Symbol(") + QStringView{toQString()}.mid(1) + QLatin1String(")");