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QVariant: fix comparison of enums to numerics

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qIsNumericType does not return true for enum types, which meant we never
called numericCompare() or numericEquals() when one of the types was an
enum.

Task-number: QTBUG-108188
Change-Id: I3d74c753055744deb8acfffd172449c68af19367
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
This commit is contained in:
Thiago Macieira 2022-11-03 22:14:39 -07:00
parent da6efbb12b
commit cf0a1c2e51
2 changed files with 197 additions and 28 deletions
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42
src/corelib/kernel/qvariant.cpp
View File

@ -2158,15 +2158,49 @@ static bool qIsFloatingPoint(uint tp)
return tp == QMetaType::Double || tp == QMetaType::Float;
}
static bool canBeNumericallyCompared(const QtPrivate::QMetaTypeInterface *iface1,
const QtPrivate::QMetaTypeInterface *iface2)
{
if (!iface1 || !iface2)
return false;
// We don't need QMetaType::id() here because the type Id is always stored
// directly for all built-in types.
bool isNumeric1 = qIsNumericType(iface1->typeId);
bool isNumeric2 = qIsNumericType(iface2->typeId);
// if they're both numeric (or QString), then they can be compared
if (isNumeric1 && isNumeric2)
return true;
bool isEnum1 = iface1->flags & QMetaType::IsEnumeration;
bool isEnum2 = iface2->flags & QMetaType::IsEnumeration;
// if both are enums, we can only compare if they are the same enum
// (the language does allow comparing two different enum types, but that's
// usually considered poor coding and produces a warning)
if (isEnum1 && isEnum2)
return QMetaType(iface1) == QMetaType(iface2);
// if one is an enum and the other is a numeric, we can compare too
if (isEnum1 && isNumeric2)
return true;
if (isNumeric1 && isEnum2)
return true;
// we need at least one enum and one numeric...
return false;
}
static int numericTypePromotion(const QtPrivate::QMetaTypeInterface *iface1,
const QtPrivate::QMetaTypeInterface *iface2)
{
Q_ASSERT(canBeNumericallyCompared(iface1, iface2));
// We don't need QMetaType::id() here because the type Id is always stored
// directly for the types we're comparing against below.
uint t1 = iface1->typeId;
uint t2 = iface2->typeId;
Q_ASSERT(qIsNumericType(t1));
Q_ASSERT(qIsNumericType(t2));
if ((t1 == QMetaType::Bool && t2 == QMetaType::QString) ||
(t2 == QMetaType::Bool && t1 == QMetaType::QString))
@ -2295,7 +2329,7 @@ bool QVariant::equals(const QVariant &v) const
if (metatype != v.metaType()) {
// try numeric comparisons, with C++ type promotion rules (no conversion)
if (qIsNumericType(metatype.id()) && qIsNumericType(v.d.type().id()))
if (canBeNumericallyCompared(metatype.iface(), v.d.type().iface()))
return numericCompare(&d, &v.d) == QPartialOrdering::Equivalent;
#ifndef QT_BOOTSTRAPPED
// if both types are related pointers to QObjects, check if they point to the same object
@ -2339,7 +2373,7 @@ QPartialOrdering QVariant::compare(const QVariant &lhs, const QVariant &rhs)
QMetaType t = lhs.d.type();
if (t != rhs.d.type()) {
// try numeric comparisons, with C++ type promotion rules (no conversion)
if (qIsNumericType(lhs.d.type().id()) && qIsNumericType(rhs.d.type().id()))
if (canBeNumericallyCompared(lhs.d.type().iface(), rhs.d.type().iface()))
return numericCompare(&lhs.d, &rhs.d);
#ifndef QT_BOOTSTRAPPED
if (canConvertMetaObject(lhs.metaType(), rhs.metaType()))

183
tests/auto/corelib/kernel/qvariant/tst_qvariant.cpp
View File

@ -59,6 +59,29 @@ struct QVariantFromValueCompiles<T, std::void_t<decltype (QVariant::fromValue(st
static_assert(QVariantFromValueCompiles<int>::value);
static_assert(!QVariantFromValueCompiles<QObject>::value);
enum EnumTest_Enum0 { EnumTest_Enum0_value = 42, EnumTest_Enum0_negValue = -8 };
Q_DECLARE_METATYPE(EnumTest_Enum0)
enum EnumTest_Enum1 : qint64 { EnumTest_Enum1_value = 42, EnumTest_Enum1_bigValue = (Q_INT64_C(1) << 33) + 50 };
Q_DECLARE_METATYPE(EnumTest_Enum1)
enum EnumTest_Enum3 : qint64 { EnumTest_Enum3_value = -47, EnumTest_Enum3_bigValue = (Q_INT64_C(1) << 56) + 5 };
Q_DECLARE_METATYPE(EnumTest_Enum3)
enum EnumTest_Enum4 : quint64 { EnumTest_Enum4_value = 47, EnumTest_Enum4_bigValue = (Q_INT64_C(1) << 52) + 45 };
Q_DECLARE_METATYPE(EnumTest_Enum4)
enum EnumTest_Enum5 : uint { EnumTest_Enum5_value = 47 };
Q_DECLARE_METATYPE(EnumTest_Enum5)
enum EnumTest_Enum6 : uchar { EnumTest_Enum6_value = 47 };
Q_DECLARE_METATYPE(EnumTest_Enum6)
enum class EnumTest_Enum7 { EnumTest_Enum7_value = 47, ensureSignedEnum7 = -1 };
Q_DECLARE_METATYPE(EnumTest_Enum7)
enum EnumTest_Enum8 : short { EnumTest_Enum8_value = 47 };
Q_DECLARE_METATYPE(EnumTest_Enum8)
template <typename T> int qToUnderlying(QFlags<T> f)
{
return f.toInt();
}
class tst_QVariant : public QObject
{
Q_OBJECT
@ -2728,6 +2751,10 @@ void tst_QVariant::compareNumerics_data() const
static const auto asString = [](const QVariant &v) {
if (v.isNull())
return QStringLiteral("null");
if (v.metaType().flags() & QMetaType::IsEnumeration)
return v.metaType().flags() & QMetaType::IsUnsignedEnumeration ?
QString::number(v.toULongLong()) :
QString::number(v.toLongLong());
switch (v.typeId()) {
case QMetaType::Char:
case QMetaType::Char16:
@ -2768,9 +2795,15 @@ QT_WARNING_PUSH
QT_WARNING_DISABLE_CLANG("-Wsign-compare")
QT_WARNING_DISABLE_GCC("-Wsign-compare")
QT_WARNING_DISABLE_MSVC(4018) // '<': signed/unsigned mismatch
static const auto addComparePair = [](auto value1, auto value2) {
static const auto addComparePairWithResult = [](auto value1, auto value2, QPartialOrdering order) {
QVariant v1 = QVariant::fromValue(value1);
QVariant v2 = QVariant::fromValue(value2);
QTest::addRow("%s(%s)-%s(%s)", v1.typeName(), qPrintable(asString(v1)),
v2.typeName(), qPrintable(asString(v2)))
<< v1 << v2 << order;
};
static const auto addComparePair = [](auto value1, auto value2) {
QPartialOrdering order = QPartialOrdering::Unordered;
if (value1 == value2)
order = QPartialOrdering::Equivalent;
@ -2778,9 +2811,7 @@ QT_WARNING_DISABLE_MSVC(4018) // '<': signed/unsigned mismatch
order = QPartialOrdering::Less;
else if (value1 > value2)
order = QPartialOrdering::Greater;
QTest::addRow("%s(%s)-%s(%s)", v1.typeName(), qPrintable(asString(v1)),
v2.typeName(), qPrintable(asString(v2)))
<< v1 << v2 << order;
addComparePairWithResult(value1, value2, order);
};
QT_WARNING_POP
@ -2815,6 +2846,10 @@ QT_WARNING_POP
addSingleType(quint64(0));
addSingleType(0.f);
addSingleType(0.0);
addList(std::array{ EnumTest_Enum0{}, EnumTest_Enum0_value, EnumTest_Enum0_negValue });
addList(std::array{ EnumTest_Enum1{}, EnumTest_Enum1_value, EnumTest_Enum1_bigValue });
addList(std::array{ EnumTest_Enum7{}, EnumTest_Enum7::EnumTest_Enum7_value, EnumTest_Enum7::ensureSignedEnum7 });
addList(std::array{ Qt::AlignRight|Qt::AlignHCenter, Qt::AlignCenter|Qt::AlignVCenter });
// heterogeneous
addComparePair(char(0), qint8(-127));
@ -2888,6 +2923,52 @@ QT_WARNING_POP
addComparePair(-double(Q_INT64_C(1) << 53), Q_INT64_C(1) << 53);
addComparePair(-double(Q_INT64_C(1) << 53) + 1, (Q_INT64_C(1) << 53) + 1);
}
// enums vs integers
addComparePair(EnumTest_Enum0_value, 0);
addComparePair(EnumTest_Enum0_value, 0U);
addComparePair(EnumTest_Enum0_value, 0LL);
addComparePair(EnumTest_Enum0_value, 0ULL);
addComparePair(EnumTest_Enum0_value, int(EnumTest_Enum0_value));
addComparePair(EnumTest_Enum0_value, qint64(EnumTest_Enum0_value));
addComparePair(EnumTest_Enum0_value, quint64(EnumTest_Enum0_value));
addComparePair(EnumTest_Enum0_negValue, int(EnumTest_Enum0_value));
addComparePair(EnumTest_Enum0_negValue, qint64(EnumTest_Enum0_value));
addComparePair(EnumTest_Enum0_negValue, quint64(EnumTest_Enum0_value));
addComparePair(EnumTest_Enum0_negValue, int(EnumTest_Enum0_negValue));
addComparePair(EnumTest_Enum0_negValue, qint64(EnumTest_Enum0_negValue));
addComparePair(EnumTest_Enum0_negValue, quint64(EnumTest_Enum0_negValue));
addComparePair(EnumTest_Enum1_value, 0);
addComparePair(EnumTest_Enum1_value, 0U);
addComparePair(EnumTest_Enum1_value, 0LL);
addComparePair(EnumTest_Enum1_value, 0ULL);
addComparePair(EnumTest_Enum1_value, int(EnumTest_Enum1_value));
addComparePair(EnumTest_Enum1_value, qint64(EnumTest_Enum1_value));
addComparePair(EnumTest_Enum1_value, quint64(EnumTest_Enum1_value));
addComparePair(EnumTest_Enum1_bigValue, int(EnumTest_Enum1_value));
addComparePair(EnumTest_Enum1_bigValue, qint64(EnumTest_Enum1_value));
addComparePair(EnumTest_Enum1_bigValue, quint64(EnumTest_Enum1_value));
addComparePair(EnumTest_Enum1_bigValue, int(EnumTest_Enum1_bigValue));
addComparePair(EnumTest_Enum1_bigValue, qint64(EnumTest_Enum1_bigValue));
addComparePair(EnumTest_Enum1_bigValue, quint64(EnumTest_Enum1_bigValue));
addComparePair(EnumTest_Enum3_value, 0);
addComparePair(EnumTest_Enum3_value, 0U);
addComparePair(EnumTest_Enum3_value, 0LL);
addComparePair(EnumTest_Enum3_value, 0ULL);
addComparePair(EnumTest_Enum3_value, int(EnumTest_Enum3_value));
addComparePair(EnumTest_Enum3_value, qint64(EnumTest_Enum3_value));
addComparePair(EnumTest_Enum3_value, quint64(EnumTest_Enum3_value));
addComparePair(EnumTest_Enum3_bigValue, int(EnumTest_Enum3_value));
addComparePair(EnumTest_Enum3_bigValue, qint64(EnumTest_Enum3_value));
addComparePair(EnumTest_Enum3_bigValue, quint64(EnumTest_Enum3_value));
addComparePair(EnumTest_Enum3_bigValue, int(EnumTest_Enum3_bigValue));
addComparePair(EnumTest_Enum3_bigValue, qint64(EnumTest_Enum3_bigValue));
addComparePair(EnumTest_Enum3_bigValue, quint64(EnumTest_Enum3_bigValue));
// enums of different types always compare as unordered
addComparePairWithResult(EnumTest_Enum0_value, EnumTest_Enum1_value, QPartialOrdering::Unordered);
}
void tst_QVariant::compareNumerics() const
@ -4818,27 +4899,16 @@ void tst_QVariant::pairElements()
TEST_PAIR_ELEMENT_ACCESS(std::pair, int, QVariant, 44, 15)
}
enum EnumTest_Enum0 { EnumTest_Enum0_value = 42, EnumTest_Enum0_negValue = -8 };
Q_DECLARE_METATYPE(EnumTest_Enum0)
enum EnumTest_Enum1 : qint64 { EnumTest_Enum1_value = 42, EnumTest_Enum1_bigValue = (Q_INT64_C(1) << 33) + 50 };
Q_DECLARE_METATYPE(EnumTest_Enum1)
enum EnumTest_Enum3 : qint64 { EnumTest_Enum3_value = -47, EnumTest_Enum3_bigValue = (Q_INT64_C(1) << 56) + 5 };
Q_DECLARE_METATYPE(EnumTest_Enum3)
enum EnumTest_Enum4 : quint64 { EnumTest_Enum4_value = 47, EnumTest_Enum4_bigValue = (Q_INT64_C(1) << 52) + 45 };
Q_DECLARE_METATYPE(EnumTest_Enum4)
enum EnumTest_Enum5 : uint { EnumTest_Enum5_value = 47 };
Q_DECLARE_METATYPE(EnumTest_Enum5)
enum EnumTest_Enum6 : uchar { EnumTest_Enum6_value = 47 };
Q_DECLARE_METATYPE(EnumTest_Enum6)
enum class EnumTest_Enum7 { EnumTest_Enum7_value = 47, ensureSignedEnum7 = -1 };
Q_DECLARE_METATYPE(EnumTest_Enum7)
enum EnumTest_Enum8 : short { EnumTest_Enum8_value = 47 };
Q_DECLARE_METATYPE(EnumTest_Enum8)
template<typename Enum> void testVariant(Enum value, bool *ok)
{
*ok = false;
auto canLosslesslyConvert = [=](auto zero) {
return sizeof(value) <= sizeof(zero) ||
value == Enum(decltype(zero)(qToUnderlying(value)));
};
bool losslessConvertToInt = canLosslesslyConvert(int{});
QVariant var = QVariant::fromValue(value);
QCOMPARE(var.userType(), qMetaTypeId<Enum>());
@ -4851,7 +4921,6 @@ template<typename Enum> void testVariant(Enum value, bool *ok)
QVERIFY(var.canConvert<qint64>());
QVERIFY(var.canConvert<quint64>());
QCOMPARE(var.value<Enum>(), value);
QCOMPARE(var.value<int>(), static_cast<int>(value));
QCOMPARE(var.value<uint>(), static_cast<uint>(value));
@ -4865,7 +4934,7 @@ template<typename Enum> void testVariant(Enum value, bool *ok)
QCOMPARE(var2.value<int>(), static_cast<int>(value));
// unary + to silence gcc warning
if ((+static_cast<qint64>(value) <= INT_MAX) && (+static_cast<qint64>(value) >= INT_MIN)) {
if (losslessConvertToInt) {
int intValue = static_cast<int>(value);
QVariant intVar = intValue;
QVERIFY(intVar.canConvert<Enum>());
@ -4875,6 +4944,72 @@ template<typename Enum> void testVariant(Enum value, bool *ok)
QVERIFY(QVariant(longValue).canConvert<Enum>());
QCOMPARE(QVariant(longValue).value<Enum>(), value);
auto value2 = Enum(qToUnderlying(value) + 1);
var2 = QVariant::fromValue(value2);
QCOMPARE_EQ(var, var);
QCOMPARE_NE(var, var2);
QCOMPARE(QVariant::compare(var, var), QPartialOrdering::Equivalent);
QCOMPARE(QVariant::compare(var, var2), QPartialOrdering::Less);
QCOMPARE(QVariant::compare(var2, var), QPartialOrdering::Greater);
QCOMPARE_EQ(var, static_cast<qint64>(value));
QCOMPARE_EQ(var, static_cast<quint64>(value));
QCOMPARE_EQ(static_cast<qint64>(value), var);
QCOMPARE_EQ(static_cast<quint64>(value), var);
QCOMPARE_NE(var2, static_cast<qint64>(value));
QCOMPARE_NE(var2, static_cast<quint64>(value));
QCOMPARE_NE(static_cast<qint64>(value), var2);
QCOMPARE_NE(static_cast<quint64>(value), var2);
if (losslessConvertToInt) {
QCOMPARE_EQ(var, int(value));
QCOMPARE_EQ(int(value), var);
QCOMPARE_NE(var2, int(value));
QCOMPARE_NE(int(value), var2);
}
if (canLosslesslyConvert(uint{})) {
QCOMPARE_EQ(var, uint(value));
QCOMPARE_EQ(uint(value), var);
QCOMPARE_NE(var2, uint(value));
QCOMPARE_NE(uint(value), var2);
}
if (canLosslesslyConvert(short{})) {
QCOMPARE_EQ(var, short(value));
QCOMPARE_EQ(short(value), var);
QCOMPARE_NE(var2, short(value));
QCOMPARE_NE(short(value), var2);
}
if (canLosslesslyConvert(ushort{})) {
QCOMPARE_EQ(var, ushort(value));
QCOMPARE_EQ(ushort(value), var);
QCOMPARE_NE(var2, ushort(value));
QCOMPARE_NE(ushort(value), var2);
}
if (canLosslesslyConvert(char{})) {
QCOMPARE_EQ(var, char(value));
QCOMPARE_EQ(char(value), var);
QCOMPARE_NE(var2, char(value));
QCOMPARE_NE(char(value), var2);
}
if (canLosslesslyConvert(uchar{})) {
QCOMPARE_EQ(var, uchar(value));
QCOMPARE_EQ(uchar(value), var);
QCOMPARE_NE(var2, uchar(value));
QCOMPARE_NE(uchar(value), var2);
}
if (canLosslesslyConvert(qint8{})) {
QCOMPARE_EQ(var, qint8(value));
QCOMPARE_EQ(qint8(value), var);
QCOMPARE_NE(var2, qint8(value));
QCOMPARE_NE(qint8(value), var2);
}
// string compares too (of the values in decimal)
QCOMPARE_EQ(var, QString::number(qToUnderlying(value)));
QCOMPARE_EQ(QString::number(qToUnderlying(value)), var);
QCOMPARE_NE(var, QString::number(qToUnderlying(value2)));
QCOMPARE_NE(QString::number(qToUnderlying(value2)), var);
*ok = true;
}