diff options
Diffstat (limited to 'src/corelib/global/qglobal.cpp')
| -rw-r--r-- | src/corelib/global/qglobal.cpp | 307 |
1 files changed, 154 insertions, 153 deletions
diff --git a/src/corelib/global/qglobal.cpp b/src/corelib/global/qglobal.cpp index 8d614b4f91..36b7560398 100644 --- a/src/corelib/global/qglobal.cpp +++ b/src/corelib/global/qglobal.cpp @@ -42,7 +42,6 @@ #include "qstring.h" #include "qvector.h" #include "qlist.h" -#include "qthreadstorage.h" #include "qdir.h" #include "qdatetime.h" #include "qoperatingsystemversion.h" @@ -131,6 +130,38 @@ Q_CORE_EXPORT void *qMemSet(void *dest, int c, size_t n); Q_STATIC_ASSERT_X(sizeof(int) == 4, "Qt assumes that int is 32 bits"); Q_STATIC_ASSERT_X(UCHAR_MAX == 255, "Qt assumes that char is 8 bits"); Q_STATIC_ASSERT_X(QT_POINTER_SIZE == sizeof(void *), "QT_POINTER_SIZE defined incorrectly"); +Q_STATIC_ASSERT_X(sizeof(float) == 4, "Qt assumes that float is 32 bits"); + +// While we'd like to check for __STDC_IEC_559__, as per ISO/IEC 9899:2011 +// Annex F (C11, normative for C++11), there are a few corner cases regarding +// denormals where GHS compiler is relying hardware behavior that is not IEC +// 559 compliant. So split the check in several subchecks. + +// On GHC the compiler reports std::numeric_limits<float>::is_iec559 as false. +// This is all right according to our needs. +#if !defined(Q_CC_GHS) +Q_STATIC_ASSERT_X(std::numeric_limits<float>::is_iec559, + "Qt assumes IEEE 754 floating point"); +#endif + +// Technically, presence of NaN and infinities are implied from the above check, +// but double checking our environment doesn't hurt... +Q_STATIC_ASSERT_X(std::numeric_limits<float>::has_infinity && + std::numeric_limits<float>::has_quiet_NaN && + std::numeric_limits<float>::has_signaling_NaN, + "Qt assumes IEEE 754 floating point"); + +// is_iec559 checks for ISO/IEC/IEEE 60559:2011 (aka IEEE 754-2008) compliance, +// but that allows for a non-binary radix. We need to recheck that. +// Note how __STDC_IEC_559__ would instead check for IEC 60559:1989, aka +// ANSI/IEEE 754−1985, which specifically implies binary floating point numbers. +Q_STATIC_ASSERT_X(std::numeric_limits<float>::radix == 2, + "Qt assumes binary IEEE 754 floating point"); + +// not required by the definition of size_t, but we depend on this +Q_STATIC_ASSERT_X(sizeof(size_t) == sizeof(void *), "size_t and a pointer don't have the same size"); +Q_STATIC_ASSERT(sizeof(size_t) == sizeof(qssize_t)); // implied by the definition +Q_STATIC_ASSERT((std::is_same<qssize_t, qptrdiff>::value)); /*! \class QFlag @@ -793,6 +824,21 @@ Q_STATIC_ASSERT_X(QT_POINTER_SIZE == sizeof(void *), "QT_POINTER_SIZE defined in */ /*! + \typedef qssize_t + \relates <QtGlobal> + \since 5.10 + + Integral type providing Posix' \c ssize_t for all platforms. + + This type is guaranteed to be the same size as a \c size_t on all + platforms supported by Qt. + + Note that qssize_t is signed. Use \c size_t for unsigned values. + + \sa qptrdiff +*/ + +/*! \enum QtMsgType \relates <QtGlobal> @@ -3091,7 +3137,7 @@ void qt_assert_x(const char *where, const char *what, const char *file, int line Deliberately not exported as part of the Qt API, but used in both qsimplerichtext.cpp and qgfxraster_qws.cpp */ -Q_CORE_EXPORT unsigned int qt_int_sqrt(unsigned int n) +Q_CORE_EXPORT Q_DECL_CONST_FUNCTION unsigned int qt_int_sqrt(unsigned int n) { // n must be in the range 0...UINT_MAX/2-1 if (n >= (UINT_MAX>>2)) { @@ -3121,24 +3167,27 @@ void *qMemSet(void *dest, int c, size_t n) { return memset(dest, c, n); } // add thread-safety for the Qt wrappers. static QBasicMutex environmentMutex; -// getenv is declared as deprecated in VS2005. This function -// makes use of the new secure getenv function. /*! \relates <QtGlobal> + \threadsafe - Returns the value of the environment variable with name \a - varName. To get the variable string, use QByteArray::constData(). - To convert the data to a QString use QString::fromLocal8Bit(). + Returns the value of the environment variable with name \a varName as a + QByteArray. If no variable by that name is found in the environment, this + function returns a default-constructed QByteArray. - \note qgetenv() was introduced because getenv() from the standard - C library was deprecated in VC2005 (and later versions). qgetenv() - uses the new replacement function in VC, and calls the standard C - library's implementation on all other platforms. + The Qt environment manipulation functions are thread-safe, but this + requires that the C library equivalent functions like getenv and putenv are + not directly called. - \warning Don't use qgetenv on Windows if the content may contain - non-US-ASCII characters, like file paths. + To convert the data to a QString use QString::fromLocal8Bit(). + + \note on desktop Windows, qgetenv() may produce data loss if the + original string contains Unicode characters not representable in the + ANSI encoding. Use qEnvironmentVariable() instead. + On Unix systems, this function is lossless. - \sa qputenv(), qEnvironmentVariableIsSet(), qEnvironmentVariableIsEmpty() + \sa qputenv(), qEnvironmentVariable(), qEnvironmentVariableIsSet(), + qEnvironmentVariableIsEmpty() */ QByteArray qgetenv(const char *varName) { @@ -3160,6 +3209,87 @@ QByteArray qgetenv(const char *varName) #endif } + +/*! + \relates <QtGlobal> + \since 5.10 + + Returns the value of the environment variable with name \a varName as a + QString. If no variable by that name is found in the environment, this + function returns \a defaultValue. + + The Qt environment manipulation functions are thread-safe, but this + requires that the C library equivalent functions like getenv and putenv are + not directly called. + + The following table describes how to choose between qgetenv() and + qEnvironmentVariable(): + \table + \header \li Condition \li Recommendation + \row + \li Variable contains file paths or user text + \li qEnvironmentVariable() + \row + \li Windows-specific code + \li qEnvironmentVariable() + \row + \li Unix-specific code, destination variable is not QString and/or is + used to interface with non-Qt APIs + \li qgetenv() + \row + \li Destination variable is a QString + \li qEnvironmentVariable() + \row + \li Destination variable is a QByteArray or std::string + \li qgetenv() + \endtable + + \note on Unix systems, this function may produce data loss if the original + string contains arbitrary binary data that cannot be decoded by the locale + codec. Use qgetenv() instead for that case. On Windows, this function is + lossless. + + \note the variable name \a varName must contain only US-ASCII characters. + + \sa qputenv(), qgetenv(), qEnvironmentVariableIsSet(), qEnvironmentVariableIsEmpty() +*/ +QString qEnvironmentVariable(const char *varName, const QString &defaultValue) +{ +#if defined(Q_OS_WIN) && !defined(Q_OS_WINRT) + QMutexLocker locker(&environmentMutex); + QVarLengthArray<wchar_t, 32> wname(int(strlen(varName)) + 1); + for (int i = 0; i < wname.size(); ++i) // wname.size() is correct: will copy terminating null + wname[i] = uchar(varName[i]); + size_t requiredSize = 0; + QString buffer; + _wgetenv_s(&requiredSize, 0, 0, wname.data()); + if (requiredSize == 0) + return defaultValue; + buffer.resize(int(requiredSize)); + _wgetenv_s(&requiredSize, reinterpret_cast<wchar_t *>(buffer.data()), requiredSize, + wname.data()); + // requiredSize includes the terminating null, which we don't want. + Q_ASSERT(buffer.endsWith(QLatin1Char('\0'))); + buffer.chop(1); + return buffer; +#else + QByteArray value = qgetenv(varName); + if (value.isNull()) + return defaultValue; +// duplicated in qfile.h (QFile::decodeName) +#if defined(Q_OS_DARWIN) + return QString::fromUtf8(value).normalized(QString::NormalizationForm_C); +#else // other Unix + return QString::fromLocal8Bit(value); +#endif +#endif +} + +QString qEnvironmentVariable(const char *varName) +{ + return qEnvironmentVariable(varName, QString()); +} + /*! \relates <QtGlobal> \since 5.1 @@ -3172,7 +3302,7 @@ QByteArray qgetenv(const char *varName) \endcode except that it's potentially much faster, and can't throw exceptions. - \sa qgetenv(), qEnvironmentVariableIsSet() + \sa qgetenv(), qEnvironmentVariable(), qEnvironmentVariableIsSet() */ bool qEnvironmentVariableIsEmpty(const char *varName) Q_DECL_NOEXCEPT { @@ -3209,7 +3339,7 @@ bool qEnvironmentVariableIsEmpty(const char *varName) Q_DECL_NOEXCEPT are too long will either be truncated or this function will set \a ok to \c false. - \sa qgetenv(), qEnvironmentVariableIsSet() + \sa qgetenv(), qEnvironmentVariable(), qEnvironmentVariableIsSet() */ int qEnvironmentVariableIntValue(const char *varName, bool *ok) Q_DECL_NOEXCEPT { @@ -3260,7 +3390,7 @@ int qEnvironmentVariableIntValue(const char *varName, bool *ok) Q_DECL_NOEXCEPT \endcode except that it's potentially much faster, and can't throw exceptions. - \sa qgetenv(), qEnvironmentVariableIsEmpty() + \sa qgetenv(), qEnvironmentVariable(), qEnvironmentVariableIsEmpty() */ bool qEnvironmentVariableIsSet(const char *varName) Q_DECL_NOEXCEPT { @@ -3290,7 +3420,7 @@ bool qEnvironmentVariableIsSet(const char *varName) Q_DECL_NOEXCEPT uses the replacement function in VC, and calls the standard C library's implementation on all other platforms. - \sa qgetenv() + \sa qgetenv(), qEnvironmentVariable() */ bool qputenv(const char *varName, const QByteArray& value) { @@ -3321,7 +3451,7 @@ bool qputenv(const char *varName, const QByteArray& value) \since 5.1 - \sa qputenv(), qgetenv() + \sa qputenv(), qgetenv(), qEnvironmentVariable() */ bool qunsetenv(const char *varName) { @@ -3346,138 +3476,6 @@ bool qunsetenv(const char *varName) #endif } -#if defined(Q_OS_ANDROID) && (__ANDROID_API__ < 21) -typedef QThreadStorage<QJNIObjectPrivate> AndroidRandomStorage; -Q_GLOBAL_STATIC(AndroidRandomStorage, randomTLS) - -#elif defined(Q_OS_UNIX) && !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS) && (_POSIX_THREAD_SAFE_FUNCTIONS - 0 > 0) - -# if defined(Q_OS_INTEGRITY) && defined(__GHS_VERSION_NUMBER) && (__GHS_VERSION_NUMBER < 500) -// older versions of INTEGRITY used a long instead of a uint for the seed. -typedef long SeedStorageType; -# else -typedef uint SeedStorageType; -# endif - -typedef QThreadStorage<SeedStorageType *> SeedStorage; -Q_GLOBAL_STATIC(SeedStorage, randTLS) // Thread Local Storage for seed value -#endif - -/*! - \relates <QtGlobal> - \since 4.2 - - Thread-safe version of the standard C++ \c srand() function. - - Sets the argument \a seed to be used to generate a new random number sequence of - pseudo random integers to be returned by qrand(). - - The sequence of random numbers generated is deterministic per thread. For example, - if two threads call qsrand(1) and subsequently call qrand(), the threads will get - the same random number sequence. - - \sa qrand() -*/ -void qsrand(uint seed) -{ -#if defined(Q_OS_ANDROID) && (__ANDROID_API__ < 21) - if (randomTLS->hasLocalData()) { - randomTLS->localData().callMethod<void>("setSeed", "(J)V", jlong(seed)); - return; - } - - QJNIObjectPrivate random("java/util/Random", - "(J)V", - jlong(seed)); - if (!random.isValid()) { - srand(seed); - return; - } - - randomTLS->setLocalData(random); -#elif defined(Q_OS_UNIX) && !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS) && (_POSIX_THREAD_SAFE_FUNCTIONS - 0 > 0) - SeedStorage *seedStorage = randTLS(); - if (seedStorage) { - SeedStorageType *pseed = seedStorage->localData(); - if (!pseed) - seedStorage->setLocalData(pseed = new SeedStorageType); - *pseed = seed; - } else { - //global static seed storage should always exist, - //except after being deleted by QGlobalStaticDeleter. - //But since it still can be called from destructor of another - //global static object, fallback to srand(seed) - srand(seed); - } -#else - // On Windows srand() and rand() already use Thread-Local-Storage - // to store the seed between calls - // this is also valid for QT_NO_THREAD - srand(seed); -#endif -} - -/*! - \relates <QtGlobal> - \since 4.2 - - Thread-safe version of the standard C++ \c rand() function. - - Returns a value between 0 and \c RAND_MAX (defined in \c <cstdlib> and - \c <stdlib.h>), the next number in the current sequence of pseudo-random - integers. - - Use \c qsrand() to initialize the pseudo-random number generator with - a seed value. - - \sa qsrand() -*/ -int qrand() -{ -#if defined(Q_OS_ANDROID) && (__ANDROID_API__ < 21) - AndroidRandomStorage *randomStorage = randomTLS(); - if (!randomStorage) - return rand(); - - if (randomStorage->hasLocalData()) { - return randomStorage->localData().callMethod<jint>("nextInt", - "(I)I", - RAND_MAX); - } - - QJNIObjectPrivate random("java/util/Random", - "(J)V", - jlong(1)); - - if (!random.isValid()) - return rand(); - - randomStorage->setLocalData(random); - return random.callMethod<jint>("nextInt", "(I)I", RAND_MAX); -#elif defined(Q_OS_UNIX) && !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS) && (_POSIX_THREAD_SAFE_FUNCTIONS - 0 > 0) - SeedStorage *seedStorage = randTLS(); - if (seedStorage) { - SeedStorageType *pseed = seedStorage->localData(); - if (!pseed) { - seedStorage->setLocalData(pseed = new SeedStorageType); - *pseed = 1; - } - return rand_r(pseed); - } else { - //global static seed storage should always exist, - //except after being deleted by QGlobalStaticDeleter. - //But since it still can be called from destructor of another - //global static object, fallback to rand() - return rand(); - } -#else - // On Windows srand() and rand() already use Thread-Local-Storage - // to store the seed between calls - // this is also valid for QT_NO_THREAD - return rand(); -#endif -} - /*! \macro forever \relates <QtGlobal> @@ -4380,8 +4378,11 @@ bool QInternal::activateCallbacks(Callback cb, void **parameters) stderr. Under Windows, the message is sent to the debugger. On QNX the message is sent to slogger2. This function does nothing if \c QT_NO_WARNING_OUTPUT was defined - during compilation; it exits if the environment variable \c - QT_FATAL_WARNINGS is not empty. + during compilation; it exits if at the nth warning corresponding to the + counter in environment variable \c QT_FATAL_WARNINGS. That is, if the + environment variable contains the value 1, it will exit on the 1st message; + if it contains the value 10, it will exit on the 10th message. Any + non-numeric value is equivalent to 1. This function takes a format string and a list of arguments, similar to the C printf() function. The format should be a Latin-1 |