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    Contents of /trunk/mkinitrd-magellan/klibc/usr/include/klibc/compiler.h

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    Revision 1297 - (show annotations) (download)
    Fri May 27 15:12:11 2011 UTC (12 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 4221 byte(s) 
    -updated to klibc-1.5.22 with mntproc definitions patch included
    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 /*
    24 * How to declare a function which should be inlined or instantiated locally
    25 */
    26 #ifdef __GNUC__
    27 # ifdef __GNUC_STDC_INLINE__
    28 # define __static_inline static __inline__ __attribute__((__gnu_inline__))
    29 # else
    30 # define __static_inline static __inline__
    31 # endif
    32 #else
    33 # define __static_inline inline /* Just hope this works... */
    34 #endif
    35
    36 /*
    37 * How to declare a function which should be inlined or have a call to
    38 * an external module
    39 */
    40 #ifdef __GNUC__
    41 # ifdef __GNUC_STDC_INLINE__
    42 # define __extern_inline extern __inline__ __attribute__((__gnu_inline__))
    43 # else
    44 # define __extern_inline extern __inline__
    45 # endif
    46 #else
    47 # define __extern_inline inline /* Just hope this works... */
    48 #endif
    49
    50 /* How to declare a function that *must* be inlined */
    51 /* Use "extern inline" even in the gcc3+ case to avoid warnings in ctype.h */
    52 #ifdef __GNUC__
    53 # if __GNUC__ >= 3
    54 # define __must_inline __extern_inline __attribute__((__always_inline__))
    55 # else
    56 # define __must_inline extern __inline__
    57 # endif
    58 #else
    59 # define __must_inline inline /* Just hope this works... */
    60 #endif
    61
    62 /* How to declare a function that does not return */
    63 #ifdef __GNUC__
    64 # define __noreturn void __attribute__((noreturn))
    65 #else
    66 # define __noreturn void
    67 #endif
    68
    69 /* "const" function:
    70
    71 Many functions do not examine any values except their arguments,
    72 and have no effects except the return value. Basically this is
    73 just slightly more strict class than the `pure' attribute above,
    74 since function is not allowed to read global memory.
    75
    76 Note that a function that has pointer arguments and examines the
    77 data pointed to must _not_ be declared `const'. Likewise, a
    78 function that calls a non-`const' function usually must not be
    79 `const'. It does not make sense for a `const' function to return
    80 `void'.
    81 */
    82 #ifdef __GNUC__
    83 # define __constfunc __attribute__((const))
    84 #else
    85 # define __constfunc
    86 #endif
    87 #undef __attribute_const__
    88 #define __attribute_const__ __constfunc
    89
    90 /* "pure" function:
    91
    92 Many functions have no effects except the return value and their
    93 return value depends only on the parameters and/or global
    94 variables. Such a function can be subject to common subexpression
    95 elimination and loop optimization just as an arithmetic operator
    96 would be. These functions should be declared with the attribute
    97 `pure'.
    98 */
    99 #ifdef __GNUC__
    100 # define __purefunc __attribute__((pure))
    101 #else
    102 # define __purefunc
    103 #endif
    104 #undef __attribute_pure__
    105 #define __attribute_pure__ __purefunc
    106
    107 /* Format attribute */
    108 #ifdef __GNUC__
    109 # define __formatfunc(t,f,a) __attribute__((format(t,f,a)))
    110 #else
    111 # define __formatfunc(t,f,a)
    112 #endif
    113
    114 /* malloc() function (returns unaliased pointer) */
    115 #if defined(__GNUC__) && (__GNUC__ >= 3)
    116 # define __mallocfunc __attribute__((malloc))
    117 #else
    118 # define __mallocfunc
    119 #endif
    120
    121 /* likely/unlikely */
    122 #if defined(__GNUC__) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95))
    123 # define __likely(x) __builtin_expect(!!(x), 1)
    124 # define __unlikely(x) __builtin_expect(!!(x), 0)
    125 #else
    126 # define __likely(x) (!!(x))
    127 # define __unlikely(x) (!!(x))
    128 #endif
    129
    130 /* Possibly unused function */
    131 #ifdef __GNUC__
    132 # define __unusedfunc __attribute__((unused))
    133 #else
    134 # define __unusedfunc
    135 #endif
    136
    137 /* It's all user space... */
    138 #define __user
    139
    140 /* The bitwise attribute: disallow arithmetric operations */
    141 #ifdef __CHECKER__ /* sparse only */
    142 # define __bitwise __attribute__((bitwise))
    143 #else
    144 # define __bitwise
    145 #endif
    146
    147 /* Shut up unused warnings */
    148 #ifdef __GNUC__
    149 # define __attribute_used__ __attribute__((used))
    150 #else
    151 # define __attribute_used__
    152 #endif
    153
    154 /* Compiler pragma to make an alias symbol */
    155 #define __ALIAS(__t, __f, __p, __a) \
    156 __t __f __p __attribute__((weak, alias(#__a)));
    157
    158 #endif