Merge branch 'msys2' of https://github.com/sitsofe/fio into master
[fio.git] / compiler / compiler.h
1 #ifndef FIO_COMPILER_H
2 #define FIO_COMPILER_H
3
4 #define __must_check            __attribute__((warn_unused_result))
5
6 #define __compiletime_warning(message)  __attribute__((warning(message)))
7 #define __compiletime_error(message)    __attribute__((error(message)))
8
9 /*
10  * Mark unused variables passed to ops functions as unused, to silence gcc
11  */
12 #define fio_unused      __attribute__((__unused__))
13 #define fio_init        __attribute__((constructor))
14 #define fio_exit        __attribute__((destructor))
15
16 #define fio_unlikely(x) __builtin_expect(!!(x), 0)
17
18 /*
19  * Check at compile time that something is of a particular type.
20  * Always evaluates to 1 so you may use it easily in comparisons.
21  */
22 #define typecheck(type,x) \
23 ({      type __dummy; \
24         __typeof__(x) __dummy2; \
25         (void)(&__dummy == &__dummy2); \
26         1; \
27 })
28
29
30 #if defined(CONFIG_STATIC_ASSERT)
31 #define compiletime_assert(condition, msg) _Static_assert(condition, msg)
32
33 #elif !defined(CONFIG_DISABLE_OPTIMIZATIONS)
34
35 #ifndef __compiletime_error
36 #define __compiletime_error(message)
37 #endif
38
39 #ifndef __compiletime_error_fallback
40 #define __compiletime_error_fallback(condition) do { } while (0)
41 #endif
42
43 #define __compiletime_assert(condition, msg, prefix, suffix)            \
44         do {                                                            \
45                 int __cond = !(condition);                              \
46                 extern void prefix ## suffix(void) __compiletime_error(msg); \
47                 if (__cond)                                             \
48                         prefix ## suffix();                             \
49                 __compiletime_error_fallback(__cond);                   \
50         } while (0)
51
52 #define _compiletime_assert(condition, msg, prefix, suffix) \
53         __compiletime_assert(condition, msg, prefix, suffix)
54
55 #define compiletime_assert(condition, msg) \
56         _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
57
58 #else
59
60 #define compiletime_assert(condition, msg)      do { } while (0)
61
62 #endif
63
64 #ifdef FIO_INTERNAL
65 #define ARRAY_SIZE(x)    (sizeof((x)) / (sizeof((x)[0])))
66 #define FIELD_SIZE(s, f) (sizeof(((__typeof__(s))0)->f))
67 #endif
68
69 #ifndef __has_attribute
70 #define __GCC4_has_attribute___fallthrough__    0
71 #endif
72
73 #if __has_attribute(__fallthrough__)
74 #define fallthrough      __attribute__((__fallthrough__))
75 #else
76 #define fallthrough     do {} while (0)  /* fallthrough */
77 #endif
78
79 #endif