Annotation of /trunk/mkinitrd-magellan/klibc/usr/include/klibc/compiler.h
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Wed Aug 18 21:11:40 2010 UTC (13 years, 8 months ago) by niro
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Wed Aug 18 21:11:40 2010 UTC (13 years, 8 months ago) by niro
File MIME type: text/plain
File size: 3671 byte(s)
-updated to klibc-1.5.19
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 | 1122 | # ifdef __GNUC_STDC_INLINE__ |
28 | # define __must_inline extern __inline__ \ | ||
29 | __attribute__((__gnu_inline__,__always_inline__)) | ||
30 | # else | ||
31 | # define __must_inline extern __inline__ __attribute__((__always_inline__)) | ||
32 | # endif | ||
33 | niro | 532 | # else |
34 | # define __must_inline extern __inline__ | ||
35 | # endif | ||
36 | #else | ||
37 | # define __must_inline inline /* Just hope this works... */ | ||
38 | #endif | ||
39 | |||
40 | /* How to declare a function that does not return */ | ||
41 | #ifdef __GNUC__ | ||
42 | # define __noreturn void __attribute__((noreturn)) | ||
43 | #else | ||
44 | # define __noreturn void | ||
45 | #endif | ||
46 | |||
47 | /* "const" function: | ||
48 | |||
49 | Many functions do not examine any values except their arguments, | ||
50 | and have no effects except the return value. Basically this is | ||
51 | just slightly more strict class than the `pure' attribute above, | ||
52 | since function is not allowed to read global memory. | ||
53 | |||
54 | Note that a function that has pointer arguments and examines the | ||
55 | data pointed to must _not_ be declared `const'. Likewise, a | ||
56 | function that calls a non-`const' function usually must not be | ||
57 | `const'. It does not make sense for a `const' function to return | ||
58 | `void'. | ||
59 | */ | ||
60 | #ifdef __GNUC__ | ||
61 | # define __constfunc __attribute__((const)) | ||
62 | #else | ||
63 | # define __constfunc | ||
64 | #endif | ||
65 | #undef __attribute_const__ | ||
66 | #define __attribute_const__ __constfunc | ||
67 | |||
68 | /* "pure" function: | ||
69 | |||
70 | Many functions have no effects except the return value and their | ||
71 | return value depends only on the parameters and/or global | ||
72 | variables. Such a function can be subject to common subexpression | ||
73 | elimination and loop optimization just as an arithmetic operator | ||
74 | would be. These functions should be declared with the attribute | ||
75 | `pure'. | ||
76 | */ | ||
77 | #ifdef __GNUC__ | ||
78 | # define __purefunc __attribute__((pure)) | ||
79 | #else | ||
80 | # define __purefunc | ||
81 | #endif | ||
82 | #undef __attribute_pure__ | ||
83 | #define __attribute_pure__ __purefunc | ||
84 | |||
85 | /* Format attribute */ | ||
86 | #ifdef __GNUC__ | ||
87 | # define __formatfunc(t,f,a) __attribute__((format(t,f,a))) | ||
88 | #else | ||
89 | # define __formatfunc(t,f,a) | ||
90 | #endif | ||
91 | |||
92 | /* malloc() function (returns unaliased pointer) */ | ||
93 | #if defined(__GNUC__) && (__GNUC__ >= 3) | ||
94 | # define __mallocfunc __attribute__((malloc)) | ||
95 | #else | ||
96 | # define __mallocfunc | ||
97 | #endif | ||
98 | |||
99 | /* likely/unlikely */ | ||
100 | #if defined(__GNUC__) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)) | ||
101 | niro | 815 | # define __likely(x) __builtin_expect(!!(x), 1) |
102 | # define __unlikely(x) __builtin_expect(!!(x), 0) | ||
103 | niro | 532 | #else |
104 | niro | 815 | # define __likely(x) (!!(x)) |
105 | # define __unlikely(x) (!!(x)) | ||
106 | niro | 532 | #endif |
107 | |||
108 | /* Possibly unused function */ | ||
109 | #ifdef __GNUC__ | ||
110 | # define __unusedfunc __attribute__((unused)) | ||
111 | #else | ||
112 | # define __unusedfunc | ||
113 | #endif | ||
114 | |||
115 | /* It's all user space... */ | ||
116 | #define __user | ||
117 | |||
118 | /* The bitwise attribute: disallow arithmetric operations */ | ||
119 | #ifdef __CHECKER__ /* sparse only */ | ||
120 | # define __bitwise __attribute__((bitwise)) | ||
121 | #else | ||
122 | # define __bitwise | ||
123 | #endif | ||
124 | |||
125 | /* Shut up unused warnings */ | ||
126 | #ifdef __GNUC__ | ||
127 | # define __attribute_used__ __attribute__((used)) | ||
128 | #else | ||
129 | # define __attribute_used__ | ||
130 | #endif | ||
131 | |||
132 | /* Compiler pragma to make an alias symbol */ | ||
133 | #define __ALIAS(__t, __f, __p, __a) \ | ||
134 | __t __f __p __attribute__((weak, alias(#__a))); | ||
135 | |||
136 | #endif |