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39 | |
40 | #ifndef QV4_ALLOCA_H |
41 | #define QV4_ALLOCA_H |
42 | |
43 | // |
44 | // W A R N I N G |
45 | // ------------- |
46 | // |
47 | // This file is not part of the Qt API. It exists purely as an |
48 | // implementation detail. This header file may change from version to |
49 | // version without notice, or even be removed. |
50 | // |
51 | // We mean it. |
52 | // |
53 | |
54 | #include <QtCore/private/qglobal_p.h> |
55 | |
56 | #if QT_CONFIG(alloca_h) |
57 | # include <alloca.h> |
58 | #elif QT_CONFIG(alloca_malloc_h) |
59 | # include <malloc.h> |
60 | // This does not matter unless compiling in strict standard mode. |
61 | # ifdef Q_CC_MSVC |
62 | # define alloca _alloca |
63 | # endif |
64 | #else |
65 | # include <stdlib.h> |
66 | #endif |
67 | |
68 | // Define Q_ALLOCA_VAR macro to be used instead of #ifdeffing |
69 | // the occurrences of alloca() in case it's not supported. |
70 | // Q_ALLOCA_DECLARE and Q_ALLOCA_ASSIGN macros separate |
71 | // memory allocation from the declaration and RAII. |
72 | #define Q_ALLOCA_VAR(type, name, size) \ |
73 | Q_ALLOCA_DECLARE(type, name); \ |
74 | Q_ALLOCA_ASSIGN(type, name, size) |
75 | |
76 | #if QT_CONFIG(alloca) |
77 | |
78 | #define Q_ALLOCA_DECLARE(type, name) \ |
79 | type *name = 0 |
80 | |
81 | #define Q_ALLOCA_ASSIGN(type, name, size) \ |
82 | name = static_cast<type*>(alloca(size)) |
83 | |
84 | #else |
85 | QT_BEGIN_NAMESPACE |
86 | class Qt_AllocaWrapper |
87 | { |
88 | public: |
89 | Qt_AllocaWrapper() { m_data = 0; } |
90 | ~Qt_AllocaWrapper() { free(m_data); } |
91 | void *data() { return m_data; } |
92 | void allocate(int size) { m_data = malloc(size); memset(m_data, 0, size); } |
93 | private: |
94 | void *m_data; |
95 | }; |
96 | QT_END_NAMESPACE |
97 | |
98 | #define Q_ALLOCA_DECLARE(type, name) \ |
99 | Qt_AllocaWrapper _qt_alloca_##name; \ |
100 | type *name = nullptr |
101 | |
102 | #define Q_ALLOCA_ASSIGN(type, name, size) \ |
103 | _qt_alloca_##name.allocate(size); \ |
104 | name = static_cast<type*>(_qt_alloca_##name.data()) |
105 | |
106 | #endif |
107 | |
108 | #endif |
109 | |