Contents 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, 5 months ago) by niro
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Fri Apr 24 18:32:46 2009 UTC (15 years, 5 months ago) by niro
File MIME type: text/plain
File size: 3523 byte(s)
-updated to klibc-1.5.15
1 | /* |
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 | /* Use "extern inline" even in the gcc3+ case to avoid warnings in ctype.h */ |
25 | #ifdef __GNUC__ |
26 | # if __GNUC__ >= 3 |
27 | # define __must_inline extern __inline__ __attribute__((always_inline)) |
28 | # 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 | # define __likely(x) __builtin_expect(!!(x), 1) |
97 | # define __unlikely(x) __builtin_expect(!!(x), 0) |
98 | #else |
99 | # define __likely(x) (!!(x)) |
100 | # define __unlikely(x) (!!(x)) |
101 | #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 |