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qt5base-lts/tests/auto/exceptionsafety/tst_exceptionsafety.cpp
Qt by Nokia 38be0d1383 Initial import from the monolithic Qt. 
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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12
2011-04-27 12:05:43 +02:00

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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtTest/QtTest>
QT_USE_NAMESPACE
#if defined(QT_NO_EXCEPTIONS)
QTEST_NOOP_MAIN
#else
class tst_ExceptionSafety: public QObject
{
Q_OBJECT
private slots:
void exceptionInSlot();
void exceptionVector();
void exceptionHash();
void exceptionMap();
void exceptionList();
void exceptionLinkedList();
// void exceptionEventLoop();
// void exceptionSignalSlot();
};
class Emitter : public QObject
{
Q_OBJECT
public:
inline void emitTestSignal() { emit testSignal(); }
signals:
void testSignal();
};
class ExceptionThrower : public QObject
{
Q_OBJECT
public slots:
void thrower() { throw 5; }
};
class Receiver : public QObject
{
Q_OBJECT
public:
Receiver()
: received(0) {}
int received;
public slots:
void receiver() { ++received; }
};
enum ThrowType { ThrowNot = 0, ThrowAtCreate = 1, ThrowAtCopy = 2, ThrowLater = 3, ThrowAtComparison = 4 };
ThrowType throwType = ThrowNot; // global flag to indicate when an exception should be throw. Will be reset when the exception has been generated.
int objCounter = 0;
/*! Class that does not throw any exceptions. Used as baseclass for all the other ones.
*/
template <int T>
class FlexibleThrower
{
public:
FlexibleThrower() : _value(-1) {
if( throwType == ThrowAtCreate ) {
throwType = ThrowNot;
throw ThrowAtCreate;
}
objCounter++;
}
FlexibleThrower( short value ) : _value(value) {
if( throwType == ThrowAtCreate ) {
throwType = ThrowNot;
throw ThrowAtCreate;
}
objCounter++;
}
FlexibleThrower(FlexibleThrower const& other ) {
// qDebug("cc");
if( throwType == ThrowAtCopy ) {
throwType = ThrowNot;
throw ThrowAtCopy;
} else if( throwType == ThrowLater ) {
throwType = ThrowAtCopy;
}
objCounter++;
_value = other.value();
}
~FlexibleThrower() { objCounter--; }
bool operator==(const FlexibleThrower<T> &t) const
{
// qDebug("vv == %d %d", value(), t.value());
if( throwType == ThrowAtComparison ) {
throwType = ThrowNot;
throw ThrowAtComparison;
}
return value()==t.value();
}
bool operator<(const FlexibleThrower<T> &t) const
{
// qDebug("vv < %d %d", value(), t.value());
if( throwType == ThrowAtComparison ) {
throwType = ThrowNot;
throw ThrowAtComparison;
}
return value()<t.value();
}
int value() const
{ return (int)_value; }
short _value;
char dummy[T];
};
uint qHash(const FlexibleThrower<2>& t)
{
// qDebug("ha");
if( throwType == ThrowAtComparison ) {
throwType = ThrowNot;
throw ThrowAtComparison;
}
return (uint)t.value();
}
typedef FlexibleThrower<2> FlexibleThrowerSmall;
typedef QMap<FlexibleThrowerSmall,FlexibleThrowerSmall> MyMap;
typedef QHash<FlexibleThrowerSmall,FlexibleThrowerSmall> MyHash;
// connect a signal to a slot that throws an exception
// run this through valgrind to make sure it doesn't corrupt
void tst_ExceptionSafety::exceptionInSlot()
{
Emitter emitter;
ExceptionThrower thrower;
connect(&emitter, SIGNAL(testSignal()), &thrower, SLOT(thrower()));
try {
emitter.emitTestSignal();
} catch (int i) {
QCOMPARE(i, 5);
}
}
void tst_ExceptionSafety::exceptionList() {
{
QList<FlexibleThrowerSmall> list;
QList<FlexibleThrowerSmall> list2;
QList<FlexibleThrowerSmall> list3;
for( int i = 0; i<10; i++ )
list.append( FlexibleThrowerSmall(i) );
try {
throwType = ThrowAtCopy;
list.append( FlexibleThrowerSmall(10));
} catch (...) {
}
QCOMPARE( list.size(), 10 );
try {
throwType = ThrowAtCopy;
list.prepend( FlexibleThrowerSmall(10));
} catch (...) {
}
QCOMPARE( list.at(0).value(), 0 );
QCOMPARE( list.size(), 10 );
try {
throwType = ThrowAtCopy;
list.insert( 8, FlexibleThrowerSmall(10));
} catch (...) {
}
QCOMPARE( list.at(7).value(), 7 );
QCOMPARE( list.at(8).value(), 8 );
QCOMPARE( list.size(), 10 );
try {
throwType = ThrowAtCopy;
FlexibleThrowerSmall t = list.takeAt( 6 );
} catch (...) {
}
QCOMPARE( list.at(6).value(), 6 );
QCOMPARE( list.at(7).value(), 7 );
QCOMPARE( list.size(), 10 );
try {
throwType = ThrowAtCopy;
list3 = list;
} catch (...) {
}
QCOMPARE( list.at(0).value(), 0 );
QCOMPARE( list.at(7).value(), 7 );
QCOMPARE( list.size(), 10 );
QCOMPARE( list3.at(0).value(), 0 );
QCOMPARE( list3.at(7).value(), 7 );
QCOMPARE( list3.size(), 10 );
try {
throwType = ThrowAtCopy;
list3.append( FlexibleThrowerSmall(11) );
} catch (...) {
}
QCOMPARE( list.at(0).value(), 0 );
QCOMPARE( list.at(7).value(), 7 );
QCOMPARE( list.size(), 10 );
QCOMPARE( list3.at(0).value(), 0 );
QCOMPARE( list3.at(7).value(), 7 );
QCOMPARE( list3.size(), 10 );
try {
list2.clear();
list2.append( FlexibleThrowerSmall(11));
throwType = ThrowAtCopy;
list3 = list+list2;
} catch (...) {
}
QCOMPARE( list.at(0).value(), 0 );
QCOMPARE( list.at(7).value(), 7 );
QCOMPARE( list.size(), 10 );
// check that copy on write works atomar
list2.clear();
list2.append( FlexibleThrowerSmall(11));
list3 = list+list2;
try {
throwType = ThrowAtCreate;
list3[7]=FlexibleThrowerSmall(12);
} catch (...) {
}
QCOMPARE( list.at(7).value(), 7 );
QCOMPARE( list.size(), 10 );
QCOMPARE( list3.at(7).value(), 7 );
QCOMPARE( list3.size(), 11 );
}
QCOMPARE(objCounter, 0 ); // check that every object has been freed
}
void tst_ExceptionSafety::exceptionLinkedList() {
{
QLinkedList<FlexibleThrowerSmall> list;
QLinkedList<FlexibleThrowerSmall> list2;
QLinkedList<FlexibleThrowerSmall> list3;
for( int i = 0; i<10; i++ )
list.append( FlexibleThrowerSmall(i) );
try {
throwType = ThrowAtCopy;
list.append( FlexibleThrowerSmall(10));
} catch (...) {
}
QCOMPARE( list.size(), 10 );
try {
throwType = ThrowAtCopy;
list.prepend( FlexibleThrowerSmall(10));
} catch (...) {
}
QCOMPARE( list.first().value(), 0 );
QCOMPARE( list.size(), 10 );
try {
throwType = ThrowAtCopy;
list3 = list;
list3.append( FlexibleThrowerSmall(11) );
} catch (...) {
}
QCOMPARE( list.first().value(), 0 );
QCOMPARE( list.size(), 10 );
QCOMPARE( list3.size(), 10 );
}
QCOMPARE(objCounter, 0 ); // check that every object has been freed
}
void tst_ExceptionSafety::exceptionVector() {
{
QVector<FlexibleThrowerSmall> vector;
QVector<FlexibleThrowerSmall> vector2;
QVector<FlexibleThrowerSmall> vector3;
for (int i = 0; i<10; i++)
vector.append( FlexibleThrowerSmall(i) );
try {
throwType = ThrowAtCopy;
vector.append( FlexibleThrowerSmall(10));
} catch (...) {
}
QCOMPARE( vector.size(), 10 );
try {
throwType = ThrowAtCopy;
vector.prepend( FlexibleThrowerSmall(10));
} catch (...) {
}
QCOMPARE( vector.at(0).value(), 0 );
QCOMPARE( vector.size(), 10 );
try {
throwType = ThrowAtCopy;
vector.insert( 8, FlexibleThrowerSmall(10));
} catch (...) {
}
QCOMPARE( vector.at(7).value(), 7 );
QCOMPARE( vector.at(8).value(), 8 );
QCOMPARE( vector.size(), 10 );
try {
throwType = ThrowAtCopy;
vector3 = vector;
} catch (...) {
}
QCOMPARE( vector.at(0).value(), 0 );
QCOMPARE( vector.at(7).value(), 7 );
QCOMPARE( vector.size(), 10 );
QCOMPARE( vector3.at(0).value(), 0 );
QCOMPARE( vector3.at(7).value(), 7 );
QCOMPARE( vector3.size(), 10 );
try {
throwType = ThrowAtCopy;
vector3.append( FlexibleThrowerSmall(11) );
} catch (...) {
}
QCOMPARE( vector.at(0).value(), 0 );
QCOMPARE( vector.at(7).value(), 7 );
QCOMPARE( vector.size(), 10 );
QCOMPARE( vector3.at(0).value(), 0 );
QCOMPARE( vector3.at(7).value(), 7 );
try {
vector2.clear();
vector2.append( FlexibleThrowerSmall(11));
throwType = ThrowAtCopy;
vector3 = vector+vector2;
} catch (...) {
}
QCOMPARE( vector.at(0).value(), 0 );
QCOMPARE( vector.at(7).value(), 7 );
QCOMPARE( vector.size(), 10 );
// check that copy on write works atomar
vector2.clear();
vector2.append( FlexibleThrowerSmall(11));
vector3 = vector+vector2;
try {
throwType = ThrowAtCreate;
vector3[7]=FlexibleThrowerSmall(12);
} catch (...) {
}
QCOMPARE( vector.at(7).value(), 7 );
QCOMPARE( vector.size(), 10 );
QCOMPARE( vector3.at(7).value(), 7 );
QCOMPARE( vector3.size(), 11 );
try {
throwType = ThrowAtCreate;
vector.resize(15);
} catch (...) {
}
QCOMPARE( vector.at(7).value(), 7 );
QCOMPARE( vector.size(), 10 );
try {
throwType = ThrowAtCreate;
vector.resize(15);
} catch (...) {
}
QCOMPARE( vector.at(7).value(), 7 );
QCOMPARE( vector.size(), 10 );
try {
throwType = ThrowLater;
vector.fill(FlexibleThrowerSmall(1), 15);
} catch (...) {
}
QCOMPARE( vector.at(0).value(), 0 );
QCOMPARE( vector.size(), 10 );
}
QCOMPARE(objCounter, 0 ); // check that every object has been freed
}
void tst_ExceptionSafety::exceptionMap() {
{
MyMap map;
MyMap map2;
MyMap map3;
throwType = ThrowNot;
for (int i = 0; i<10; i++)
map[ FlexibleThrowerSmall(i) ] = FlexibleThrowerSmall(i);
return; // further test are deactivated until Map is fixed.
for( int i = ThrowAtCopy; i<=ThrowAtComparison; i++ ) {
try {
throwType = (ThrowType)i;
map[ FlexibleThrowerSmall(10) ] = FlexibleThrowerSmall(10);
} catch(...) {
}
QCOMPARE( map.size(), 10 );
QCOMPARE( map[ FlexibleThrowerSmall(1) ], FlexibleThrowerSmall(1) );
}
map2 = map;
try {
throwType = ThrowLater;
map2[ FlexibleThrowerSmall(10) ] = FlexibleThrowerSmall(10);
} catch(...) {
}
/* qDebug("%d %d", map.size(), map2.size() );
for( int i=0; i<map.size(); i++ )
qDebug( "Value at %d: %d",i, map.value(FlexibleThrowerSmall(i), FlexibleThrowerSmall()).value() );
QCOMPARE( map.value(FlexibleThrowerSmall(1), FlexibleThrowerSmall()), FlexibleThrowerSmall(1) );
qDebug( "Value at %d: %d",1, map[FlexibleThrowerSmall(1)].value() );
qDebug("%d %d", map.size(), map2.size() );
*/
QCOMPARE( map[ FlexibleThrowerSmall(1) ], FlexibleThrowerSmall(1) );
QCOMPARE( map.size(), 10 );
QCOMPARE( map2[ FlexibleThrowerSmall(1) ], FlexibleThrowerSmall(1) );
QCOMPARE( map2.size(), 10 );
}
QCOMPARE(objCounter, 0 ); // check that every object has been freed
}
void tst_ExceptionSafety::exceptionHash() {
{
MyHash hash;
MyHash hash2;
MyHash hash3;
for( int i = 0; i<10; i++ )
hash[ FlexibleThrowerSmall(i) ] = FlexibleThrowerSmall(i);
for( int i = ThrowAtCopy; i<=ThrowAtComparison; i++ ) {
try {
throwType = (ThrowType)i;
hash[ FlexibleThrowerSmall(10) ] = FlexibleThrowerSmall(10);
} catch(...) {
}
QCOMPARE( hash.size(), 10 );
}
hash2 = hash;
try {
throwType = ThrowLater;
hash2[ FlexibleThrowerSmall(10) ] = FlexibleThrowerSmall(10);
} catch(...) {
}
QCOMPARE( hash[ FlexibleThrowerSmall(1) ], FlexibleThrowerSmall(1) );
QCOMPARE( hash.size(), 10 );
QCOMPARE( hash2[ FlexibleThrowerSmall(1) ], FlexibleThrowerSmall(1) );
QCOMPARE( hash2.size(), 10 );
hash2.clear();
try {
throwType = ThrowLater;
hash2.reserve(30);
} catch(...) {
}
QCOMPARE( hash2.size(), 0 );
/*
try {
throwType = ThrowAtCopy;
hash.prepend( FlexibleThrowerSmall(10));
} catch (...) {
}
QCOMPARE( hash.at(0).value(), 0 );
QCOMPARE( hash.size(), 10 );
try {
throwType = ThrowAtCopy;
hash.insert( 8, FlexibleThrowerSmall(10));
} catch (...) {
}
QCOMPARE( hash.at(7).value(), 7 );
QCOMPARE( hash.at(8).value(), 8 );
QCOMPARE( hash.size(), 10 );
qDebug("val");
try {
throwType = ThrowAtCopy;
hash3 = hash;
} catch (...) {
}
QCOMPARE( hash.at(0).value(), 0 );
QCOMPARE( hash.at(7).value(), 7 );
QCOMPARE( hash.size(), 10 );
QCOMPARE( hash3.at(0).value(), 0 );
QCOMPARE( hash3.at(7).value(), 7 );
QCOMPARE( hash3.size(), 10 );
try {
throwType = ThrowAtCopy;
hash3.append( FlexibleThrowerSmall(11) );
} catch (...) {
}
QCOMPARE( hash.at(0).value(), 0 );
QCOMPARE( hash.at(7).value(), 7 );
QCOMPARE( hash.size(), 10 );
QCOMPARE( hash3.at(0).value(), 0 );
QCOMPARE( hash3.at(7).value(), 7 );
QCOMPARE( hash3.at(11).value(), 11 );
try {
hash2.clear();
hash2.append( FlexibleThrowerSmall(11));
throwType = ThrowAtCopy;
hash3 = hash+hash2;
} catch (...) {
}
QCOMPARE( hash.at(0).value(), 0 );
QCOMPARE( hash.at(7).value(), 7 );
QCOMPARE( hash.size(), 10 );
// check that copy on write works atomar
hash2.clear();
hash2.append( FlexibleThrowerSmall(11));
hash3 = hash+hash2;
try {
throwType = ThrowAtCopy;
hash3[7]=FlexibleThrowerSmall(12);
} catch (...) {
}
QCOMPARE( hash.at(7).value(), 7 );
QCOMPARE( hash.size(), 10 );
QCOMPARE( hash3.at(7).value(), 7 );
QCOMPARE( hash3.size(), 11 );
*/
}
QCOMPARE(objCounter, 0 ); // check that every object has been freed
}
// Disable these tests until the level of exception safety in event loops is clear
#if 0
enum
{
ThrowEventId = QEvent::User + 42,
NoThrowEventId = QEvent::User + 43
};
class ThrowEvent : public QEvent
{
public:
ThrowEvent()
: QEvent(static_cast<QEvent::Type>(ThrowEventId))
{
}
};
class NoThrowEvent : public QEvent
{
public:
NoThrowEvent()
: QEvent(static_cast<QEvent::Type>(NoThrowEventId))
{}
};
struct IntEx : public std::exception
{
IntEx(int aEx) : ex(aEx) {}
int ex;
};
class TestObject : public QObject
{
public:
TestObject()
: throwEventCount(0), noThrowEventCount(0) {}
int throwEventCount;
int noThrowEventCount;
protected:
bool event(QEvent *event)
{
if (int(event->type()) == ThrowEventId) {
throw IntEx(++throwEventCount);
} else if (int(event->type()) == NoThrowEventId) {
++noThrowEventCount;
}
return QObject::event(event);
}
};
void tst_ExceptionSafety::exceptionEventLoop()
{
// send an event that throws
TestObject obj;
ThrowEvent throwEvent;
try {
qApp->sendEvent(&obj, &throwEvent);
} catch (IntEx code) {
QCOMPARE(code.ex, 1);
}
QCOMPARE(obj.throwEventCount, 1);
// post an event that throws
qApp->postEvent(&obj, new ThrowEvent);
try {
qApp->processEvents();
} catch (IntEx code) {
QCOMPARE(code.ex, 2);
}
QCOMPARE(obj.throwEventCount, 2);
// post a normal event, then a throwing event, then a normal event
// run this in valgrind to ensure that it doesn't leak.
qApp->postEvent(&obj, new NoThrowEvent);
qApp->postEvent(&obj, new ThrowEvent);
qApp->postEvent(&obj, new NoThrowEvent);
try {
qApp->processEvents();
} catch (IntEx code) {
QCOMPARE(code.ex, 3);
}
// here, we should have received on non-throwing event and one throwing one
QCOMPARE(obj.throwEventCount, 3);
#ifndef __SYMBIAN32__
// symbian event loops will have absorbed the exceptions
QCOMPARE(obj.noThrowEventCount, 1);
#endif
// spin the event loop again
qApp->processEvents();
// now, we should have received the second non-throwing event
QCOMPARE(obj.noThrowEventCount, 2);
}
void tst_ExceptionSafety::exceptionSignalSlot()
{
Emitter e;
ExceptionThrower thrower;
Receiver r1;
Receiver r2;
// connect a signal to a normal object, a thrower and a normal object again
connect(&e, SIGNAL(testSignal()), &r1, SLOT(receiver()));
connect(&e, SIGNAL(testSignal()), &thrower, SLOT(thrower()));
connect(&e, SIGNAL(testSignal()), &r2, SLOT(receiver()));
int code = 0;
try {
e.emitTestSignal();
} catch (int c) {
code = c;
}
// 5 is the magic number that's thrown by thrower
QCOMPARE(code, 5);
// assumption: slots are called in the connection order
QCOMPARE(r1.received, 1);
QCOMPARE(r2.received, 0);
}
#endif
QTEST_MAIN(tst_ExceptionSafety)
#include "tst_exceptionsafety.moc"
#endif // QT_NO_EXCEPTIONS
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