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

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    Revision 1297 - (hide 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 niro 532 /*
    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 niro 1297 /*
    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 niro 532 /* How to declare a function that *must* be inlined */
    51 niro 815 /* Use "extern inline" even in the gcc3+ case to avoid warnings in ctype.h */
    52 niro 532 #ifdef __GNUC__
    53     # if __GNUC__ >= 3
    54 niro 1297 # define __must_inline __extern_inline __attribute__((__always_inline__))
    55 niro 532 # 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 niro 815 # define __likely(x) __builtin_expect(!!(x), 1)
    124     # define __unlikely(x) __builtin_expect(!!(x), 0)
    125 niro 532 #else
    126 niro 815 # define __likely(x) (!!(x))
    127     # define __unlikely(x) (!!(x))
    128 niro 532 #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