Annotation of /trunk/mkinitrd-magellan/klibc/usr/include/klibc/compiler.h
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Revision 815 -
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Fri Apr 24 18:32:46 2009 UTC (15 years ago) by niro
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File size: 3523 byte(s)
Fri Apr 24 18:32:46 2009 UTC (15 years ago) by niro
File MIME type: text/plain
File size: 3523 byte(s)
-updated to klibc-1.5.15
| 1 | niro | 532 | /* |
| 2 | * klibc/compiler.h | ||
| 3 | * | ||
| 4 | * Various compiler features | ||
| 5 | */ | ||
| 6 | |||
| 7 | #ifndef _KLIBC_COMPILER_H | ||
| 8 | #define _KLIBC_COMPILER_H | ||
| 9 | |||
| 10 | /* Specific calling conventions */ | ||
| 11 | /* __cdecl is used when we want varadic and non-varadic functions to have | ||
| 12 | the same binary calling convention. */ | ||
| 13 | #ifdef __i386__ | ||
| 14 | # ifdef __GNUC__ | ||
| 15 | # define __cdecl __attribute__((cdecl,regparm(0))) | ||
| 16 | # else | ||
| 17 | /* Most other C compilers have __cdecl as a keyword */ | ||
| 18 | # endif | ||
| 19 | #else | ||
| 20 | # define __cdecl /* Meaningless on non-i386 */ | ||
| 21 | #endif | ||
| 22 | |||
| 23 | /* How to declare a function that *must* be inlined */ | ||
| 24 | niro | 815 | /* Use "extern inline" even in the gcc3+ case to avoid warnings in ctype.h */ |
| 25 | niro | 532 | #ifdef __GNUC__ |
| 26 | # if __GNUC__ >= 3 | ||
| 27 | niro | 815 | # define __must_inline extern __inline__ __attribute__((always_inline)) |
| 28 | niro | 532 | # else |
| 29 | # define __must_inline extern __inline__ | ||
| 30 | # endif | ||
| 31 | #else | ||
| 32 | # define __must_inline inline /* Just hope this works... */ | ||
| 33 | #endif | ||
| 34 | |||
| 35 | /* How to declare a function that does not return */ | ||
| 36 | #ifdef __GNUC__ | ||
| 37 | # define __noreturn void __attribute__((noreturn)) | ||
| 38 | #else | ||
| 39 | # define __noreturn void | ||
| 40 | #endif | ||
| 41 | |||
| 42 | /* "const" function: | ||
| 43 | |||
| 44 | Many functions do not examine any values except their arguments, | ||
| 45 | and have no effects except the return value. Basically this is | ||
| 46 | just slightly more strict class than the `pure' attribute above, | ||
| 47 | since function is not allowed to read global memory. | ||
| 48 | |||
| 49 | Note that a function that has pointer arguments and examines the | ||
| 50 | data pointed to must _not_ be declared `const'. Likewise, a | ||
| 51 | function that calls a non-`const' function usually must not be | ||
| 52 | `const'. It does not make sense for a `const' function to return | ||
| 53 | `void'. | ||
| 54 | */ | ||
| 55 | #ifdef __GNUC__ | ||
| 56 | # define __constfunc __attribute__((const)) | ||
| 57 | #else | ||
| 58 | # define __constfunc | ||
| 59 | #endif | ||
| 60 | #undef __attribute_const__ | ||
| 61 | #define __attribute_const__ __constfunc | ||
| 62 | |||
| 63 | /* "pure" function: | ||
| 64 | |||
| 65 | Many functions have no effects except the return value and their | ||
| 66 | return value depends only on the parameters and/or global | ||
| 67 | variables. Such a function can be subject to common subexpression | ||
| 68 | elimination and loop optimization just as an arithmetic operator | ||
| 69 | would be. These functions should be declared with the attribute | ||
| 70 | `pure'. | ||
| 71 | */ | ||
| 72 | #ifdef __GNUC__ | ||
| 73 | # define __purefunc __attribute__((pure)) | ||
| 74 | #else | ||
| 75 | # define __purefunc | ||
| 76 | #endif | ||
| 77 | #undef __attribute_pure__ | ||
| 78 | #define __attribute_pure__ __purefunc | ||
| 79 | |||
| 80 | /* Format attribute */ | ||
| 81 | #ifdef __GNUC__ | ||
| 82 | # define __formatfunc(t,f,a) __attribute__((format(t,f,a))) | ||
| 83 | #else | ||
| 84 | # define __formatfunc(t,f,a) | ||
| 85 | #endif | ||
| 86 | |||
| 87 | /* malloc() function (returns unaliased pointer) */ | ||
| 88 | #if defined(__GNUC__) && (__GNUC__ >= 3) | ||
| 89 | # define __mallocfunc __attribute__((malloc)) | ||
| 90 | #else | ||
| 91 | # define __mallocfunc | ||
| 92 | #endif | ||
| 93 | |||
| 94 | /* likely/unlikely */ | ||
| 95 | #if defined(__GNUC__) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)) | ||
| 96 | niro | 815 | # define __likely(x) __builtin_expect(!!(x), 1) |
| 97 | # define __unlikely(x) __builtin_expect(!!(x), 0) | ||
| 98 | niro | 532 | #else |
| 99 | niro | 815 | # define __likely(x) (!!(x)) |
| 100 | # define __unlikely(x) (!!(x)) | ||
| 101 | niro | 532 | #endif |
| 102 | |||
| 103 | /* Possibly unused function */ | ||
| 104 | #ifdef __GNUC__ | ||
| 105 | # define __unusedfunc __attribute__((unused)) | ||
| 106 | #else | ||
| 107 | # define __unusedfunc | ||
| 108 | #endif | ||
| 109 | |||
| 110 | /* It's all user space... */ | ||
| 111 | #define __user | ||
| 112 | |||
| 113 | /* The bitwise attribute: disallow arithmetric operations */ | ||
| 114 | #ifdef __CHECKER__ /* sparse only */ | ||
| 115 | # define __bitwise __attribute__((bitwise)) | ||
| 116 | #else | ||
| 117 | # define __bitwise | ||
| 118 | #endif | ||
| 119 | |||
| 120 | /* Shut up unused warnings */ | ||
| 121 | #ifdef __GNUC__ | ||
| 122 | # define __attribute_used__ __attribute__((used)) | ||
| 123 | #else | ||
| 124 | # define __attribute_used__ | ||
| 125 | #endif | ||
| 126 | |||
| 127 | /* Compiler pragma to make an alias symbol */ | ||
| 128 | #define __ALIAS(__t, __f, __p, __a) \ | ||
| 129 | __t __f __p __attribute__((weak, alias(#__a))); | ||
| 130 | |||
| 131 | #endif |