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 532 - (show annotations) (download)
    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 /*
    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