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

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    Revision 815 - (show annotations) (download)
    Fri Apr 24 18:32:46 2009 UTC (15 years 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