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// Copyright (C) 2016 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 "qv4variantobject_p.h"
#include "qv4functionobject_p.h"
#include <private/qqmlvaluetypewrapper_p.h>
#include <private/qv4qobjectwrapper_p.h>
QT_BEGIN_NAMESPACE
using namespace QV4;
DEFINE_OBJECT_VTABLE(VariantObject);
void Heap::VariantObject::init()
{
Object::init();
scarceData = new ExecutionEngine::ScarceResourceData;
}
void Heap::VariantObject::init(const QMetaType type, const void *data)
{
Object::init();
scarceData = new ExecutionEngine::ScarceResourceData(type, data);
if (isScarce())
removeVmePropertyReference();
}
bool VariantObject::Data::isScarce() const
{
int t = data().userType();
return t == QMetaType::QPixmap || t == QMetaType::QImage;
}
bool VariantObject::virtualIsEqualTo(Managed *m, Managed *other)
{
Q_ASSERT(m->as<QV4::VariantObject>());
QV4::VariantObject *lv = static_cast<QV4::VariantObject *>(m);
if (QV4::VariantObject *rv = other->as<QV4::VariantObject>())
return lv->d()->data() == rv->d()->data();
if (QV4::QQmlValueTypeWrapper *v = other->as<QQmlValueTypeWrapper>())
return v->isEqual(lv->d()->data());
return false;
}
void VariantObject::addVmePropertyReference() const
{
if (d()->isScarce() && ++d()->vmePropertyReferenceCount == 1) {
// remove from the ep->scarceResources list
// since it is now no longer eligible to be
// released automatically by the engine.
d()->addVmePropertyReference();
}
}
void VariantObject::removeVmePropertyReference() const
{
if (d()->isScarce() && --d()->vmePropertyReferenceCount == 0) {
// and add to the ep->scarceResources list
// since it is now eligible to be released
// automatically by the engine.
d()->removeVmePropertyReference();
}
}
void VariantPrototype::init()
{
defineDefaultProperty(QStringLiteral("preserve"), method_preserve, 0);
defineDefaultProperty(QStringLiteral("destroy"), method_destroy, 0);
defineDefaultProperty(engine()->id_valueOf(), method_valueOf, 0);
defineDefaultProperty(engine()->id_toString(), method_toString, 0);
}
ReturnedValue VariantPrototype::method_preserve(const FunctionObject *, const Value *thisObject, const Value *, int)
{
const VariantObject *o = thisObject->as<QV4::VariantObject>();
if (o && o->d()->isScarce())
o->d()->addVmePropertyReference();
RETURN_UNDEFINED();
}
ReturnedValue VariantPrototype::method_destroy(const FunctionObject *, const Value *thisObject, const Value *, int)
{
const VariantObject *o = thisObject->as<QV4::VariantObject>();
if (o) {
if (o->d()->isScarce())
o->d()->addVmePropertyReference();
o->d()->data() = QVariant();
}
RETURN_UNDEFINED();
}
ReturnedValue VariantPrototype::method_toString(const FunctionObject *b, const Value *thisObject, const Value *, int)
{
ExecutionEngine *v4 = b->engine();
const VariantObject *o = thisObject->as<QV4::VariantObject>();
if (!o)
RETURN_UNDEFINED();
const QVariant variant = o->d()->data();
QString result = variant.toString();
if (result.isEmpty() && !variant.canConvert(QMetaType(QMetaType::QString))) {
QDebug dbg(&result);
dbg << variant;
// QDebug appends a space, we're not interested in continuing the stream so we chop it off.
// Can't use nospace() because it would affect the debug-stream operator of the variant.
result.chop(1);
}
return Encode(v4->newString(result));
}
ReturnedValue VariantPrototype::method_valueOf(const FunctionObject *b, const Value *thisObject, const Value *, int)
{
const VariantObject *o = thisObject->as<QV4::VariantObject>();
if (o) {
QVariant v = o->d()->data();
switch (v.userType()) {
case QMetaType::UnknownType:
return Encode::undefined();
case QMetaType::QString:
return Encode(b->engine()->newString(v.toString()));
case QMetaType::Int:
return Encode(v.toInt());
case QMetaType::Double:
case QMetaType::UInt:
return Encode(v.toDouble());
case QMetaType::Bool:
return Encode(v.toBool());
default:
if (QMetaType(v.metaType()).flags() & QMetaType::IsEnumeration)
if (v.metaType().sizeOf() <= qsizetype(sizeof(int)))
return Encode(v.toInt());
if (v.canConvert<double>())
return Encode(v.toDouble());
if (v.canConvert<int>())
return Encode(v.toInt());
if (v.canConvert<uint>())
return Encode(v.toUInt());
if (v.canConvert<bool>())
return Encode(v.toBool());
if (v.canConvert<QString>())
return Encode(b->engine()->newString(v.toString()));
break;
}
}
return thisObject->asReturnedValue();
}
QT_END_NAMESPACE