Magellan Linux

  • Back to homepage
    • /[magellan-source]/trunk/mkinitrd-magellan/klibc/usr/include/klibc/compiler.h

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

    Parent Directory Parent Directory | Revision Log Revision Log

    Revision 1122 - (show annotations) (download)
    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 /*
    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 # 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 # 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 # define __likely(x) __builtin_expect(!!(x), 1)
    102 # define __unlikely(x) __builtin_expect(!!(x), 0)
    103 #else
    104 # define __likely(x) (!!(x))
    105 # define __unlikely(x) (!!(x))
    106 #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