diff options
Diffstat (limited to 'src/qml/qtqmlglobal_p.h')
-rw-r--r-- | src/qml/qtqmlglobal_p.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/qml/qtqmlglobal_p.h b/src/qml/qtqmlglobal_p.h index 63585fd62e..026be5a703 100644 --- a/src/qml/qtqmlglobal_p.h +++ b/src/qml/qtqmlglobal_p.h @@ -55,6 +55,46 @@ #include <QtQml/private/qtqml-config_p.h> #include <QtQml/qtqmlglobal.h> +// Define Q_ALLOCA_VAR macro to be used instead of #ifdeffing +// the occurrences of alloca() in case it's not supported. +// Q_ALLOCA_DECLARE and Q_ALLOCA_ASSIGN macros separate +// memory allocation from the declaration and RAII. +#define Q_ALLOCA_VAR(type, name, size) \ + Q_ALLOCA_DECLARE(type, name); \ + Q_ALLOCA_ASSIGN(type, name, size) + +#if QT_CONFIG(alloca) + +#define Q_ALLOCA_DECLARE(type, name) \ + type *name = 0 + +#define Q_ALLOCA_ASSIGN(type, name, size) \ + name = static_cast<type*>(alloca(size)) + +#else +QT_BEGIN_NAMESPACE +class Qt_AllocaWrapper +{ +public: + Qt_AllocaWrapper() { m_data = 0; } + ~Qt_AllocaWrapper() { free(m_data); } + void *data() { return m_data; } + void allocate(int size) { m_data = malloc(size); } +private: + void *m_data; +}; +QT_END_NAMESPACE + +#define Q_ALLOCA_DECLARE(type, name) \ + Qt_AllocaWrapper _qt_alloca_##name; \ + type *name = 0 + +#define Q_ALLOCA_ASSIGN(type, name, size) \ + _qt_alloca_##name.allocate(size); \ + name = static_cast<type*>(_qt_alloca_##name.data()) + +#endif + #if defined(QT_BUILD_QMLDEVTOOLS_LIB) || defined(QT_QMLDEVTOOLS_LIB) # define Q_QML_PRIVATE_EXPORT #else |