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| |
| #ifndef QV4_ALLOCA_H |
| #define QV4_ALLOCA_H |
| |
| // |
| // W A R N I N G |
| // ------------- |
| // |
| // This file is not part of the Qt API. It exists purely as an |
| // implementation detail. This header file may change from version to |
| // version without notice, or even be removed. |
| // |
| // We mean it. |
| // |
| |
| #include <QtCore/private/qglobal_p.h> |
| |
| #if QT_CONFIG(alloca_h) |
| # include <alloca.h> |
| #elif QT_CONFIG(alloca_malloc_h) |
| # include <malloc.h> |
| // This does not matter unless compiling in strict standard mode. |
| # ifdef Q_CC_MSVC |
| # define alloca _alloca |
| # endif |
| #else |
| # include <stdlib.h> |
| #endif |
| |
| // 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); memset(m_data, 0, size); } |
| private: |
| void *m_data; |
| }; |
| QT_END_NAMESPACE |
| |
| #define Q_ALLOCA_DECLARE(type, name) \ |
| Qt_AllocaWrapper _qt_alloca_##name; \ |
| type *name = nullptr |
| |
| #define Q_ALLOCA_ASSIGN(type, name, size) \ |
| _qt_alloca_##name.allocate(size); \ |
| name = static_cast<type*>(_qt_alloca_##name.data()) |
| |
| #endif |
| |
| #endif |