Annotation of /trunk/mkinitrd-magellan/klibc/usr/include/klibc/compiler.h
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
File MIME type: text/plain
File size: 3433 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
| 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 | #ifdef __GNUC__ | ||
| 25 | # if __GNUC__ >= 3 | ||
| 26 | # define __must_inline static __inline__ __attribute__((always_inline)) | ||
| 27 | # else | ||
| 28 | # define __must_inline extern __inline__ | ||
| 29 | # endif | ||
| 30 | #else | ||
| 31 | # define __must_inline inline /* Just hope this works... */ | ||
| 32 | #endif | ||
| 33 | |||
| 34 | /* How to declare a function that does not return */ | ||
| 35 | #ifdef __GNUC__ | ||
| 36 | # define __noreturn void __attribute__((noreturn)) | ||
| 37 | #else | ||
| 38 | # define __noreturn void | ||
| 39 | #endif | ||
| 40 | |||
| 41 | /* "const" function: | ||
| 42 | |||
| 43 | Many functions do not examine any values except their arguments, | ||
| 44 | and have no effects except the return value. Basically this is | ||
| 45 | just slightly more strict class than the `pure' attribute above, | ||
| 46 | since function is not allowed to read global memory. | ||
| 47 | |||
| 48 | Note that a function that has pointer arguments and examines the | ||
| 49 | data pointed to must _not_ be declared `const'. Likewise, a | ||
| 50 | function that calls a non-`const' function usually must not be | ||
| 51 | `const'. It does not make sense for a `const' function to return | ||
| 52 | `void'. | ||
| 53 | */ | ||
| 54 | #ifdef __GNUC__ | ||
| 55 | # define __constfunc __attribute__((const)) | ||
| 56 | #else | ||
| 57 | # define __constfunc | ||
| 58 | #endif | ||
| 59 | #undef __attribute_const__ | ||
| 60 | #define __attribute_const__ __constfunc | ||
| 61 | |||
| 62 | /* "pure" function: | ||
| 63 | |||
| 64 | Many functions have no effects except the return value and their | ||
| 65 | return value depends only on the parameters and/or global | ||
| 66 | variables. Such a function can be subject to common subexpression | ||
| 67 | elimination and loop optimization just as an arithmetic operator | ||
| 68 | would be. These functions should be declared with the attribute | ||
| 69 | `pure'. | ||
| 70 | */ | ||
| 71 | #ifdef __GNUC__ | ||
| 72 | # define __purefunc __attribute__((pure)) | ||
| 73 | #else | ||
| 74 | # define __purefunc | ||
| 75 | #endif | ||
| 76 | #undef __attribute_pure__ | ||
| 77 | #define __attribute_pure__ __purefunc | ||
| 78 | |||
| 79 | /* Format attribute */ | ||
| 80 | #ifdef __GNUC__ | ||
| 81 | # define __formatfunc(t,f,a) __attribute__((format(t,f,a))) | ||
| 82 | #else | ||
| 83 | # define __formatfunc(t,f,a) | ||
| 84 | #endif | ||
| 85 | |||
| 86 | /* malloc() function (returns unaliased pointer) */ | ||
| 87 | #if defined(__GNUC__) && (__GNUC__ >= 3) | ||
| 88 | # define __mallocfunc __attribute__((malloc)) | ||
| 89 | #else | ||
| 90 | # define __mallocfunc | ||
| 91 | #endif | ||
| 92 | |||
| 93 | /* likely/unlikely */ | ||
| 94 | #if defined(__GNUC__) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)) | ||
| 95 | # define __likely(x) __builtin_expect((x), 1) | ||
| 96 | # define __unlikely(x) __builtin_expect((x), 0) | ||
| 97 | #else | ||
| 98 | # define __likely(x) (x) | ||
| 99 | # define __unlikely(x) (x) | ||
| 100 | #endif | ||
| 101 | |||
| 102 | /* Possibly unused function */ | ||
| 103 | #ifdef __GNUC__ | ||
| 104 | # define __unusedfunc __attribute__((unused)) | ||
| 105 | #else | ||
| 106 | # define __unusedfunc | ||
| 107 | #endif | ||
| 108 | |||
| 109 | /* It's all user space... */ | ||
| 110 | #define __user | ||
| 111 | |||
| 112 | /* The bitwise attribute: disallow arithmetric operations */ | ||
| 113 | #ifdef __CHECKER__ /* sparse only */ | ||
| 114 | # define __bitwise __attribute__((bitwise)) | ||
| 115 | #else | ||
| 116 | # define __bitwise | ||
| 117 | #endif | ||
| 118 | |||
| 119 | /* Shut up unused warnings */ | ||
| 120 | #ifdef __GNUC__ | ||
| 121 | # define __attribute_used__ __attribute__((used)) | ||
| 122 | #else | ||
| 123 | # define __attribute_used__ | ||
| 124 | #endif | ||
| 125 | |||
| 126 | /* Compiler pragma to make an alias symbol */ | ||
| 127 | #define __ALIAS(__t, __f, __p, __a) \ | ||
| 128 | __t __f __p __attribute__((weak, alias(#__a))); | ||
| 129 | |||
| 130 | #endif |