Commit | Line | Data |
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4fee8096 JA |
1 | #ifndef FIO_COMPILER_H |
2 | #define FIO_COMPILER_H | |
5018f79f | 3 | #include <assert.h> |
4fee8096 JA |
4 | |
5 | #if __GNUC__ >= 4 | |
6 | #include "compiler-gcc4.h" | |
73e07acd | 7 | #elif __GNUC__ == 3 |
4fee8096 JA |
8 | #include "compiler-gcc3.h" |
9 | #else | |
10 | #error Compiler too old, need gcc at least gcc 3.x | |
11 | #endif | |
12 | ||
993cca04 JA |
13 | #ifndef __must_check |
14 | #define __must_check | |
15 | #endif | |
16 | ||
7b4203d7 JA |
17 | /* |
18 | * Mark unused variables passed to ops functions as unused, to silence gcc | |
19 | */ | |
20 | #define fio_unused __attribute__((__unused__)) | |
21 | #define fio_init __attribute__((constructor)) | |
22 | #define fio_exit __attribute__((destructor)) | |
23 | ||
225ba9e3 JA |
24 | #define fio_unlikely(x) __builtin_expect(!!(x), 0) |
25 | ||
ff8039b7 JA |
26 | /* |
27 | * Check at compile time that something is of a particular type. | |
28 | * Always evaluates to 1 so you may use it easily in comparisons. | |
29 | */ | |
30 | #define typecheck(type,x) \ | |
31 | ({ type __dummy; \ | |
32 | typeof(x) __dummy2; \ | |
33 | (void)(&__dummy == &__dummy2); \ | |
34 | 1; \ | |
35 | }) | |
36 | ||
5018f79f AH |
37 | |
38 | #if defined(CONFIG_STATIC_ASSERT) | |
39 | #define compiletime_assert(condition, msg) _Static_assert(condition, msg) | |
40 | ||
484817a9 JA |
41 | #elif !defined(CONFIG_DISABLE_OPTIMIZATIONS) |
42 | ||
029716a2 JA |
43 | #ifndef __compiletime_error |
44 | #define __compiletime_error(message) | |
45 | #endif | |
484817a9 | 46 | |
029716a2 JA |
47 | #ifndef __compiletime_error_fallback |
48 | #define __compiletime_error_fallback(condition) do { } while (0) | |
49 | #endif | |
50 | ||
51 | #define __compiletime_assert(condition, msg, prefix, suffix) \ | |
52 | do { \ | |
53 | int __cond = !(condition); \ | |
54 | extern void prefix ## suffix(void) __compiletime_error(msg); \ | |
55 | if (__cond) \ | |
56 | prefix ## suffix(); \ | |
57 | __compiletime_error_fallback(__cond); \ | |
58 | } while (0) | |
59 | ||
60 | #define _compiletime_assert(condition, msg, prefix, suffix) \ | |
61 | __compiletime_assert(condition, msg, prefix, suffix) | |
62 | ||
63 | #define compiletime_assert(condition, msg) \ | |
64 | _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) | |
65 | ||
484817a9 JA |
66 | #else |
67 | ||
68 | #define compiletime_assert(condition, msg) do { } while (0) | |
69 | ||
4fee8096 | 70 | #endif |
5018f79f AH |
71 | |
72 | #endif |