path: root/tests/auto/symbian/qmainexceptions/tst_qmainexceptions.cpp

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#include <QtTest/QtTest>
#include <e32base.h>

#ifdef Q_OS_SYMBIAN

typedef void TLeavingFunc();

class tst_qmainexceptions : public QObject
{
    Q_OBJECT
public:
    tst_qmainexceptions(){};
    ~tst_qmainexceptions(){};

    void TestSchedulerCatchesError(TLeavingFunc* f, int error);
    void TestSymbianRoundTrip(int leave, int trap);

    bool event(QEvent *event);

public slots:
    void initTestCase();
private slots:
    void trap();
    void cleanupstack();
    void leave();
    void testTranslateBadAlloc();
    void testTranslateBigAlloc();
    void testRoundTrip();
    void testTrap();
    void testPropagation();
    void testDtor1();
    void testDtor2();
    void testNestedExceptions();
};

class CDummy : public CBase
{
public:
    CDummy(){}
    ~CDummy(){}
};

void tst_qmainexceptions::initTestCase()
{
}

void tst_qmainexceptions::trap()
{
    TTrapHandler *th= User::TrapHandler();
    QVERIFY((int)th);
}

void tst_qmainexceptions::cleanupstack()
{
    __UHEAP_MARK;
    //fails if OOM
    CDummy* dummy1 = new (ELeave) CDummy;
    __UHEAP_CHECK(1);
    CleanupStack::PushL(dummy1);
    CleanupStack::PopAndDestroy(dummy1);
    __UHEAP_MARKEND;
}

void tst_qmainexceptions::leave()
{
    __UHEAP_MARK;
    CDummy* dummy1 = 0;
    TRAPD(err,{
        CDummy* csDummy = new (ELeave) CDummy;
        CleanupStack::PushL(csDummy);
        __UHEAP_FAILNEXT(1);
        dummy1 = new (ELeave) CDummy;
        //CleanupStack::PopAndDestroy(csDummy); not executed as previous line throws
    });
    QCOMPARE(err,KErrNoMemory);
    QVERIFY(!((int)dummy1));
    __UHEAP_MARKEND;
}

class CTestActive : public CActive
{
public:
    CTestActive(TLeavingFunc* aFunc) : CActive(EPriorityStandard), iFunc(aFunc)
    {
        CActiveScheduler::Add(this);
    }
    ~CTestActive()
    {
        Cancel();
    }
    void DoCancel() {}
    void Test()
    {
        // complete this AO in a nested scheduler, to make it synchronous
        TRequestStatus* s = &iStatus;
        SetActive();
        User::RequestComplete(s, KErrNone);
        CActiveScheduler::Start();
    }
    void RunL()
    {
        (*iFunc)();
        CActiveScheduler::Stop();   // will only get here if iFunc does not leave
    }
    TInt RunError(TInt aError)
    {
        error = aError;
        CActiveScheduler::Stop();   // will only get here if iFunc leaves
        return KErrNone;
    }
public:
    TLeavingFunc* iFunc;
    int error;
};

void tst_qmainexceptions::TestSchedulerCatchesError(TLeavingFunc* f, int error)
{
    CTestActive *act = new(ELeave) CTestActive(f);
    act->Test();
    QCOMPARE(act->error, error);
    delete act;
}

void ThrowBadAlloc()
{
    throw std::bad_alloc();
}

void TranslateThrowBadAllocL()
{
    QT_TRANSLATE_EXCEPTION_TO_SYMBIAN_LEAVE(ThrowBadAlloc());
}

void tst_qmainexceptions::testTranslateBadAlloc()
{
    // bad_alloc should give KErrNoMemory in an AO
    TestSchedulerCatchesError(&TranslateThrowBadAllocL, KErrNoMemory);
}

void BigAlloc()
{
    int *x = new int[100000000];
    delete [] x;
}

void TranslateBigAllocL()
{
    QT_TRANSLATE_EXCEPTION_TO_SYMBIAN_LEAVE(BigAlloc());
}

void tst_qmainexceptions::testTranslateBigAlloc()
{
    // this test will fail if new does not throw on failure, otherwise should give KErrNoMemory in AO
    TestSchedulerCatchesError(&TranslateBigAllocL, KErrNoMemory);
}

void tst_qmainexceptions::TestSymbianRoundTrip(int leave, int trap)
{
    // check that leave converted to exception, converted to error gives expected error code
    int trapped;
    QT_TRANSLATE_EXCEPTION_TO_SYMBIAN_ERROR(
        trapped,
        QT_TRANSLATE_SYMBIAN_LEAVE_TO_EXCEPTION(
            User::LeaveIfError(leave)));
    QCOMPARE(trap, trapped);
}

void tst_qmainexceptions::testRoundTrip()
{
    for (int e=-50; e<0; e++)
        TestSymbianRoundTrip(e, e);
    TestSymbianRoundTrip(KErrNone, KErrNone);
    // positive error codes are not errors
    TestSymbianRoundTrip(1, KErrNone);
    TestSymbianRoundTrip(1000000000, KErrNone);
}

void tst_qmainexceptions::testTrap()
{
    // testing qt_translateExceptionToSymbianErrorL
    TRAPD(err, qt_translateExceptionToSymbianErrorL(std::bad_alloc()));
    QCOMPARE(err, KErrNoMemory);
}

bool tst_qmainexceptions::event(QEvent *aEvent)
{
    if (aEvent->type() == QEvent::User+1)
        throw std::bad_alloc();
    else if (aEvent->type() == QEvent::User+2) {
        QEvent event(QEvent::Type(QEvent::User+1));
        QApplication::sendEvent(this, &event);
    }
    return QObject::event(aEvent);
}

void tst_qmainexceptions::testPropagation()
{
    // test exception thrown from event is propagated back to sender
    QEvent event(QEvent::Type(QEvent::User+1));
    bool caught = false;
    try {
        QApplication::sendEvent(this, &event);
    } catch (const std::bad_alloc&) {
        caught = true;
    }
    QCOMPARE(caught, true);

    // testing nested events propagate back to top level sender
    caught = false;
    QEvent event2(QEvent::Type(QEvent::User+2));
    try {
        QApplication::sendEvent(this, &event2);
    } catch (const std::bad_alloc&) {
        caught = true;
    }
    QCOMPARE(caught, true);
}

void tst_qmainexceptions::testDtor1()
{
    // destructors work on exception
    int i = 0;
    struct SAutoInc {
        SAutoInc(int& aI) : i(aI) { ++i; }
        ~SAutoInc() { --i; }
        int &i;
    } ai(i);
    QCOMPARE(i, 1);
    try {
        SAutoInc ai2(i);
        QCOMPARE(i, 2);
        throw std::bad_alloc();
        QFAIL("should not get here");
    } catch (const std::bad_alloc&) {
        QCOMPARE(i, 1);
    }
    QCOMPARE(i, 1);
}

void tst_qmainexceptions::testDtor2()
{
    // memory is cleaned up correctly on exception
    // this crashes with winscw compiler build < 481
    __UHEAP_MARK;
    try {
        QString str("abc");
        str += "def";
        throw std::bad_alloc();
        QFAIL("should not get here");
    } catch (const std::bad_alloc&) { }
    __UHEAP_MARKEND;
}

void tst_qmainexceptions::testNestedExceptions()
{
    // throwing exceptions while handling exceptions
    struct Oops {
        Oops* next;
        Oops(int level) : next(level > 0 ? new Oops(level-1) : 0) {}
        ~Oops() {
            try { throw std::bad_alloc(); }
            catch (const std::exception&) {delete next;}
        }
    };
    try {
        Oops oops(5);
        throw std::bad_alloc();
    }
    catch (const std::exception&) {}
}


QTEST_MAIN(tst_qmainexceptions)
#include "tst_qmainexceptions.moc"
#else
QTEST_NOOP_MAIN
#endif