Commit | Line | Data |
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4fee8096 JA |
1 | #ifndef FIO_COMPILER_H |
2 | #define FIO_COMPILER_H | |
3 | ||
0e7e0725 BVA |
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))) | |
993cca04 | 8 | |
7b4203d7 JA |
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 | ||
225ba9e3 JA |
16 | #define fio_unlikely(x) __builtin_expect(!!(x), 0) |
17 | ||
ff8039b7 JA |
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; \ | |
3376ecf4 | 24 | __typeof__(x) __dummy2; \ |
ff8039b7 JA |
25 | (void)(&__dummy == &__dummy2); \ |
26 | 1; \ | |
27 | }) | |
28 | ||
5018f79f AH |
29 | |
30 | #if defined(CONFIG_STATIC_ASSERT) | |
31 | #define compiletime_assert(condition, msg) _Static_assert(condition, msg) | |
32 | ||
484817a9 JA |
33 | #elif !defined(CONFIG_DISABLE_OPTIMIZATIONS) |
34 | ||
029716a2 JA |
35 | #ifndef __compiletime_error |
36 | #define __compiletime_error(message) | |
37 | #endif | |
484817a9 | 38 | |
029716a2 JA |
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 | ||
484817a9 JA |
58 | #else |
59 | ||
60 | #define compiletime_assert(condition, msg) do { } while (0) | |
61 | ||
4fee8096 | 62 | #endif |
5018f79f | 63 | |
c26438ad | 64 | #ifdef FIO_INTERNAL |
59f94d26 JA |
65 | #define FIO_ARRAY_SIZE(x) (sizeof((x)) / (sizeof((x)[0]))) |
66 | #define FIO_FIELD_SIZE(s, f) (sizeof(((__typeof__(s))0)->f)) | |
c26438ad JA |
67 | #endif |
68 | ||
db83b0ab | 69 | #ifndef __has_attribute |
31e65735 | 70 | #define __has_attribute(x) __GCC4_has_attribute_##x |
db83b0ab JA |
71 | #define __GCC4_has_attribute___fallthrough__ 0 |
72 | #endif | |
73 | ||
74 | #if __has_attribute(__fallthrough__) | |
87933e32 | 75 | #define fio_fallthrough __attribute__((__fallthrough__)) |
db83b0ab | 76 | #else |
87933e32 | 77 | #define fio_fallthrough do {} while (0) /* fallthrough */ |
db83b0ab JA |
78 | #endif |
79 | ||
5018f79f | 80 | #endif |