qt5base-lts/tests/auto/other/toolsupport/tst_toolsupport.cpp

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**
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#include <QtTest>

// Don't do this at home. This is test code, not production.
#define protected public
#define private public

#include <private/qdatetime_p.h>
#include <private/qfile_p.h>
#include <private/qfileinfo_p.h>
#include <private/qobject_p.h>
#include <qobject.h>

#if defined(Q_CC_GNU) || defined(Q_CC_MSVC)
#define RUN_MEMBER_OFFSET_TEST 1
#else
#define RUN_MEMBER_OFFSET_TEST 0
#endif

#if RUN_MEMBER_OFFSET_TEST
template <typename T, typename K>
size_t pmm_to_offsetof(T K:: *pmm)
{
#ifdef Q_CC_MSVC
    // Even on 64 bit MSVC uses 4 byte offsets.
    quint32 ret;
#else
    size_t ret;
#endif
    Q_STATIC_ASSERT(sizeof(ret) == sizeof(pmm));
    memcpy(&ret, &pmm, sizeof(ret));
    return ret;
}
#endif

class tst_toolsupport : public QObject
{
    Q_OBJECT

private slots:
    void offsets();
    void offsets_data();
};

void tst_toolsupport::offsets()
{
    QFETCH(size_t, actual);
    QFETCH(int, expected32);
    QFETCH(int, expected64);
    size_t expect = sizeof(void *) == 4 ? expected32 : expected64;
    QCOMPARE(actual, expect);
}

void tst_toolsupport::offsets_data()
{
    QTest::addColumn<size_t>("actual");
    QTest::addColumn<int>("expected32");
    QTest::addColumn<int>("expected64");

    {
        QTestData &data = QTest::newRow("sizeof(QObjectData)")
                << sizeof(QObjectData);
        data << 28 << 48; // vptr + 3 ptr + 2 int + ptr
    }

#if RUN_MEMBER_OFFSET_TEST
    {
        QTestData &data = QTest::newRow("QObjectPrivate::extraData")
                << pmm_to_offsetof(&QObjectPrivate::extraData);
        data << 28 << 48;    // sizeof(QObjectData)
    }

    {
        QTestData &data = QTest::newRow("QFileInfoPrivate::fileEntry")
                << pmm_to_offsetof(&QFileInfoPrivate::fileEntry);
        data << 4 << 8;
    }

    {
        QTestData &data = QTest::newRow("QFileSystemEntry::filePath")
                << pmm_to_offsetof(&QFileSystemEntry::m_filePath);
        data << 0 << 0;
    }

#ifdef Q_OS_LINUX
    if (sizeof(void *) == 8) {
        QTestData &data = QTest::newRow("QFilePrivate::fileName")
                << pmm_to_offsetof(&QFilePrivate::fileName);
        data << -1 << 248;
    }
#endif

    {
#ifdef Q_OS_WIN
        QTest::newRow("QDateTimePrivate::m_msecs")
            << pmm_to_offsetof(&QDateTimePrivate::m_msecs) << 8 << 8;
        QTest::newRow("QDateTimePrivate::m_spec")
            << pmm_to_offsetof(&QDateTimePrivate::m_spec) << 16 << 16;
        QTest::newRow("QDateTimePrivate::m_offsetFromUtc")
            << pmm_to_offsetof(&QDateTimePrivate::m_offsetFromUtc) << 20 << 20;
        QTest::newRow("QDateTimePrivate::m_timeZone")
            << pmm_to_offsetof(&QDateTimePrivate::m_timeZone) << 24 << 24;
        QTest::newRow("QDateTimePrivate::m_status")
            << pmm_to_offsetof(&QDateTimePrivate::m_status) << 28 << 32;
#else
        QTest::newRow("QDateTimePrivate::m_msecs")
            << pmm_to_offsetof(&QDateTimePrivate::m_msecs) << 4 << 8;
        QTest::newRow("QDateTimePrivate::m_spec")
            << pmm_to_offsetof(&QDateTimePrivate::m_spec) << 12 << 16;
        QTest::newRow("QDateTimePrivate::m_offsetFromUtc")
            << pmm_to_offsetof(&QDateTimePrivate::m_offsetFromUtc) << 16 << 20;
        QTest::newRow("QDateTimePrivate::m_timeZone")
            << pmm_to_offsetof(&QDateTimePrivate::m_timeZone) << 20 << 24;
        QTest::newRow("QDateTimePrivate::m_status")
            << pmm_to_offsetof(&QDateTimePrivate::m_status) << 24 << 32;
#endif
    }
#endif // RUN_MEMBER_OFFSET_TEST
}


QTEST_APPLESS_MAIN(tst_toolsupport);

#include "tst_toolsupport.moc"