diff options
Diffstat (limited to 'src/corelib/global/qglobal.cpp')
| -rw-r--r-- | src/corelib/global/qglobal.cpp | 311 |
1 files changed, 277 insertions, 34 deletions
diff --git a/src/corelib/global/qglobal.cpp b/src/corelib/global/qglobal.cpp index dd1dbd2..e53fd2d 100644 --- a/src/corelib/global/qglobal.cpp +++ b/src/corelib/global/qglobal.cpp @@ -69,6 +69,7 @@ #endif #if defined(Q_OS_SYMBIAN) +#include <e32def.h> #include <e32debug.h> #endif @@ -131,7 +132,8 @@ QT_BEGIN_NAMESPACE If you want to use QFlags for your own enum types, use the Q_DECLARE_FLAGS() and Q_DECLARE_OPERATORS_FOR_FLAGS(). - For example: + + Example: \snippet doc/src/snippets/code/src_corelib_global_qglobal.cpp 1 @@ -448,14 +450,18 @@ QT_BEGIN_NAMESPACE function. You can retrieve the minimum and maximum of two given objects using qMin() and qMax() respectively. All these functions return a corresponding template type; the template types can be - replaced by any other type. For example: + replaced by any other type. + + Example: \snippet doc/src/snippets/code/src_corelib_global_qglobal.cpp 3 <QtGlobal> also contains functions that generate messages from the given string argument: qCritical(), qDebug(), qFatal() and qWarning(). These functions call the message handler with the - given message. For example: + given message. + + Example: \snippet doc/src/snippets/code/src_corelib_global_qglobal.cpp 4 @@ -700,7 +706,9 @@ QT_BEGIN_NAMESPACE \relates <QtGlobal> Wraps the signed 64-bit integer \a literal in a - platform-independent way. For example: + platform-independent way. + + Example: \snippet doc/src/snippets/code/src_corelib_global_qglobal.cpp 8 @@ -711,7 +719,9 @@ QT_BEGIN_NAMESPACE \relates <QtGlobal> Wraps the unsigned 64-bit integer \a literal in a - platform-independent way. For example: + platform-independent way. + + Example: \snippet doc/src/snippets/code/src_corelib_global_qglobal.cpp 9 @@ -740,7 +750,11 @@ QT_BEGIN_NAMESPACE /*! \fn const T &qAbs(const T &value) \relates <QtGlobal> - Returns the absolute value of \a value. For example: + Compares \a value to the 0 of type T and returns the absolute + value. Thus if T is \e {double}, then \a value is compared to + \e{(double) 0}. + + Example: \snippet doc/src/snippets/code/src_corelib_global_qglobal.cpp 10 */ @@ -748,7 +762,9 @@ QT_BEGIN_NAMESPACE /*! \fn int qRound(qreal value) \relates <QtGlobal> - Rounds \a value to the nearest integer. For example: + Rounds \a value to the nearest integer. + + Example: \snippet doc/src/snippets/code/src_corelib_global_qglobal.cpp 11 */ @@ -756,7 +772,9 @@ QT_BEGIN_NAMESPACE /*! \fn qint64 qRound64(qreal value) \relates <QtGlobal> - Rounds \a value to the nearest 64-bit integer. For example: + Rounds \a value to the nearest 64-bit integer. + + Example: \snippet doc/src/snippets/code/src_corelib_global_qglobal.cpp 12 */ @@ -764,7 +782,9 @@ QT_BEGIN_NAMESPACE /*! \fn const T &qMin(const T &value1, const T &value2) \relates <QtGlobal> - Returns the minimum of \a value1 and \a value2. For example: + Returns the minimum of \a value1 and \a value2. + + Example: \snippet doc/src/snippets/code/src_corelib_global_qglobal.cpp 13 @@ -774,7 +794,9 @@ QT_BEGIN_NAMESPACE /*! \fn const T &qMax(const T &value1, const T &value2) \relates <QtGlobal> - Returns the maximum of \a value1 and \a value2. For example: + Returns the maximum of \a value1 and \a value2. + + Example: \snippet doc/src/snippets/code/src_corelib_global_qglobal.cpp 14 @@ -785,7 +807,9 @@ QT_BEGIN_NAMESPACE \relates <QtGlobal> Returns \a value bounded by \a min and \a max. This is equivalent - to qMax(\a min, qMin(\a value, \a max)). For example: + to qMax(\a min, qMin(\a value, \a max)). + + Example: \snippet doc/src/snippets/code/src_corelib_global_qglobal.cpp 15 @@ -931,7 +955,9 @@ QT_BEGIN_NAMESPACE 4.1.2, the QT_VERSION macro will expand to 0x040102. You can use QT_VERSION to use the latest Qt features where - available. For example: + available. + + Example: \snippet doc/src/snippets/code/src_corelib_global_qglobal.cpp 16 @@ -1903,6 +1929,15 @@ void qt_check_pointer(const char *n, int l) qWarning("In file %s, line %d: Out of memory", n, l); } +/* \internal + Allows you to throw an exception without including <new> + Called internally from Q_CHECK_PTR on certain OS combinations +*/ +void qBadAlloc() +{ + QT_THROW(std::bad_alloc()); +} + /* The Q_ASSERT macro calls this function when the test fails. */ @@ -2150,7 +2185,12 @@ void qt_message_output(QtMsgType msgType, const char *buf) #endif #if defined(Q_OS_SYMBIAN) - User::Invariant(); // Panic the current thread + __DEBUGGER(); // on the emulator, get the debugger to kick in if there's one around + TBuf<256> tmp; + TPtrC8 ptr(reinterpret_cast<const TUint8*>(buf)); + TInt len = Min(tmp.MaxLength(), ptr.Length()); + tmp.Copy(ptr.Left(len)); + User::Panic(tmp, 0); // Panic the current thread #elif (defined(Q_OS_UNIX) || defined(Q_CC_MINGW)) abort(); // trap; generates core dump #else @@ -2159,6 +2199,48 @@ void qt_message_output(QtMsgType msgType, const char *buf) } } +#if !defined(QT_NO_EXCEPTIONS) +/*! + \internal + Uses a local buffer to output the message. Not locale safe + cuts off + everything after character 1023, but will work in out of memory situations. +*/ +static void qEmergencyOut(QtMsgType msgType, const char *msg, va_list ap) +{ + char emergency_buf[256] = { '\0' }; + emergency_buf[255] = '\0'; + if (msg) + qvsnprintf(emergency_buf, 255, msg, ap); + qt_message_output(msgType, emergency_buf); +} +#endif + +/*! + \internal +*/ +static void qt_message(QtMsgType msgType, const char *msg, va_list ap) +{ +#if !defined(QT_NO_EXCEPTIONS) + if (std::uncaught_exception()) { + qEmergencyOut(msgType, msg, ap); + return; + } +#endif + QByteArray buf; + if (msg) { + QT_TRY { + buf = QString().vsprintf(msg, ap).toLocal8Bit(); + } QT_CATCH(const std::bad_alloc &) { +#if !defined(QT_NO_EXCEPTIONS) + qEmergencyOut(msgType, msg, ap); + // don't rethrow - we use qWarning and friends in destructors. + return; +#endif + } + } + qt_message_output(msgType, buf.constData()); +} + #undef qDebug /*! \relates <QtGlobal> @@ -2196,14 +2278,10 @@ void qt_message_output(QtMsgType msgType, const char *buf) */ void qDebug(const char *msg, ...) { - QString buf; va_list ap; - va_start(ap, msg); // use variable arg list - if (msg) - buf.vsprintf(msg, ap); + va_start(ap, msg); // use variable arg list + qt_message(QtDebugMsg, msg, ap); va_end(ap); - - qt_message_output(QtDebugMsg, buf.toLocal8Bit().constData()); } #undef qWarning @@ -2240,14 +2318,10 @@ void qDebug(const char *msg, ...) */ void qWarning(const char *msg, ...) { - QString buf; va_list ap; va_start(ap, msg); // use variable arg list - if (msg) - buf.vsprintf(msg, ap); + qt_message(QtWarningMsg, msg, ap); va_end(ap); - - qt_message_output(QtWarningMsg, buf.toLocal8Bit().constData()); } /*! @@ -2280,15 +2354,12 @@ void qWarning(const char *msg, ...) */ void qCritical(const char *msg, ...) { - QString buf; va_list ap; va_start(ap, msg); // use variable arg list - if (msg) - buf.vsprintf(msg, ap); + qt_message(QtCriticalMsg, msg, ap); va_end(ap); - - qt_message_output(QtCriticalMsg, buf.toLocal8Bit().constData()); } + #ifdef QT3_SUPPORT void qSystemWarning(const char *msg, int code) { qCritical("%s (%s)", msg, qt_error_string(code).toLocal8Bit().constData()); } @@ -2296,6 +2367,8 @@ void qSystemWarning(const char *msg, int code) void qErrnoWarning(const char *msg, ...) { + // qt_error_string() will allocate anyway, so we don't have + // to be careful here (like we do in plain qWarning()) QString buf; va_list ap; va_start(ap, msg); @@ -2308,6 +2381,8 @@ void qErrnoWarning(const char *msg, ...) void qErrnoWarning(int code, const char *msg, ...) { + // qt_error_string() will allocate anyway, so we don't have + // to be careful here (like we do in plain qWarning()) QString buf; va_list ap; va_start(ap, msg); @@ -2344,14 +2419,10 @@ void qErrnoWarning(int code, const char *msg, ...) */ void qFatal(const char *msg, ...) { - QString buf; va_list ap; va_start(ap, msg); // use variable arg list - if (msg) - buf.vsprintf(msg, ap); + qt_message(QtFatalMsg, msg, ap); va_end(ap); - - qt_message_output(QtFatalMsg, buf.toLocal8Bit().constData()); } // getenv is declared as deprecated in VS2005. This function @@ -3139,4 +3210,176 @@ bool QInternal::callFunction(InternalFunction func, void **args) \sa Q_DECL_EXPORT */ +#if defined(Q_OS_SYMBIAN) + +#include <typeinfo> + +/*! \macro QT_TRANSLATE_SYMBIAN_LEAVE_TO_EXCEPTION(function) + \relates <QtGlobal> + \ingroup qts60 + + TRAP leaves from Symbian \a function and throws an appropriate + standard C++ exception instead. + This must be used when calling Symbian OS leaving functions + from inside Qt or standard C++ code, so that the code can respond + correctly to the exception. + + \warning This macro is only available on Symbian. + + Example: + + \code + // A Symbian leaving function is being called within a Qt function. + // Any leave must be converted to an exception + CAknTitlePane* titlePane = S60->titlePane(); + if (titlePane) { + TPtrC captionPtr(qt_QString2TPtrC(caption)); + QT_TRANSLATE_SYMBIAN_LEAVE_TO_EXCEPTION(titlePane->SetTextL(captionPtr)); + } + \endcode + + \sa QT_TRANSLATE_EXCEPTION_TO_SYMBIAN_ERROR(), QT_TRANSLATE_EXCEPTION_TO_SYMBIAN_LEAVE() +*/ + +/*! \macro QT_TRANSLATE_EXCEPTION_TO_SYMBIAN_ERROR(error, function) + \relates <QtGlobal> + \ingroup qts60 + + Catch standard C++ exceptions from a \a function and convert them to a Symbian OS + \a error code, or \c KErrNone if there is no exception. + This must be used inside Qt or standard C++ code when using exception throwing + code (practically anything) and returning an error code to Symbian OS. + + \warning This macro is only available on Symbian. + + Example: + + \code + // An exception might be thrown in this Symbian TInt error returning function. + // It is caught and translated to an error code + TInt QServerApp::Connect(const QString &serverName) + { + TPtrC name; + TInt err; + QT_TRANSLATE_EXCEPTION_TO_SYMBIAN_ERROR(err, name.Set(qt_QString2TPtrC(serverName))); + if (err != KErrNone) + return err; + return iServer.Connect(name); + } + \endcode +} + + \sa QT_TRANSLATE_EXCEPTION_TO_SYMBIAN_LEAVE(), QT_TRANSLATE_SYMBIAN_LEAVE_TO_EXCEPTION() +*/ + +/*! \macro QT_TRANSLATE_EXCEPTION_TO_SYMBIAN_LEAVE(function) + \relates <QtGlobal> + \ingroup qts60 + + Catch standard C++ exceptions from \a function and convert them to Symbian OS + leaves. This must be used inside Qt or standard C++ code when using exception + throwing code (practically anything) and returning to Symbian OS from a leaving function. + For example inside a Symbian active object's \c RunL function implemented with Qt code. + + \warning This macro is only available on Symbian. + + Example: + + \code + // This active object signals Qt code + // Exceptions from the Qt code must be converted to Symbian OS leaves for the active scheduler + void QWakeUpActiveObject::RunL() + { + iStatus = KRequestPending; + SetActive(); + QT_TRANSLATE_EXCEPTION_TO_SYMBIAN_LEAVE(m_dispatcher->wakeUpWasCalled()); + } + \endcode + + \sa QT_TRANSLATE_SYMBIAN_LEAVE_TO_EXCEPTION(), QT_TRANSLATE_EXCEPTION_TO_SYMBIAN_ERROR() +*/ + +#include <stdexcept> + +class QSymbianLeaveException : public std::exception +{ +public: + inline QSymbianLeaveException(int err) : error(err) {} + inline const char* what() const throw() { return "Symbian leave exception"; } + +public: + int error; +}; + +/*! \relates <QtGlobal> + \ingroup qts60 + + Throws an exception if the \a error parameter is a symbian error code. + This is the exception throwing equivalent of Symbian's User::LeaveIfError. + + \warning This function is only available on Symbian. + + \sa qt_translateExceptionToSymbianErrorL(), qt_translateExceptionToSymbianError() +*/ +void qt_translateSymbianErrorToException(int error) +{ + if (error >= KErrNone) + return; // do nothing - not an exception + switch (error) { + case KErrNoMemory: + throw std::bad_alloc(); + default: + throw QSymbianLeaveException(error); + } +} + +/*! \relates <QtGlobal> + \ingroup qts60 + + Convert a caught standard C++ exception \a aThrow to a Symbian leave + + \warning This function is only available on Symbian. + + \sa qt_translateSymbianErrorToException(), qt_translateExceptionToSymbianError() +*/ +void qt_translateExceptionToSymbianErrorL(const std::exception& aThrow) +{ + User::Leave(qt_translateExceptionToSymbianError(aThrow)); +} + +/*! \relates <QtGlobal> + \ingroup qts60 + + Convert a caught standard C++ exception \a aThrow to a Symbian error code + + \warning This function is only available on Symbian. + + \sa qt_translateSymbianErrorToException(), qt_translateExceptionToSymbianErrorL() +*/ +int qt_translateExceptionToSymbianError(const std::exception& aThrow) +{ + const std::type_info& atype = typeid(aThrow); + int err = KErrGeneral; + + if(atype == typeid (std::bad_alloc)) + err = KErrNoMemory; + else if(atype == typeid(QSymbianLeaveException)) + err = static_cast<const QSymbianLeaveException&>(aThrow).error; + else if(atype == typeid(std::invalid_argument)) + err = KErrArgument; + else if(atype == typeid(std::out_of_range)) + // std::out_of_range is of type logic_error which by definition means that it is + // "presumably detectable before the program executes". + // std::out_of_range is used to report an argument is not within the expected range. + // The description of KErrArgument says an argument is out of range. Hence the mapping. + err = KErrArgument; + else if(atype == typeid(std::overflow_error)) + err = KErrOverflow; + else if(atype == typeid(std::underflow_error)) + err = KErrUnderflow; + + return err; +} +#endif + QT_END_NAMESPACE |