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Annotation of Gnu-Mach/kern/macros.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2009, 2010, 2013 Richard Braun.
        !             3:  *
        !             4:  * This program is free software: you can redistribute it and/or modify
        !             5:  * it under the terms of the GNU General Public License as published by
        !             6:  * the Free Software Foundation, either version 3 of the License, or
        !             7:  * (at your option) any later version.
        !             8:  *
        !             9:  * This program is distributed in the hope that it will be useful,
        !            10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            12:  * GNU General Public License for more details.
        !            13:  *
        !            14:  * You should have received a copy of the GNU General Public License
        !            15:  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
        !            16:  *
        !            17:  *
        !            18:  * Helper macros.
        !            19:  */
        !            20: 
        !            21: #ifndef _KERN_MACROS_H
        !            22: #define _KERN_MACROS_H
        !            23: 
        !            24: #define MACRO_BEGIN         ({
        !            25: #define MACRO_END           })
        !            26: #define        MACRO_RETURN    if (1) return
        !            27: 
        !            28: #define __QUOTE(x)          #x
        !            29: #define QUOTE(x)            __QUOTE(x)
        !            30: 
        !            31: #ifdef __ASSEMBLER__
        !            32: #define DECL_CONST(x, s)    x
        !            33: #else /* __ASSEMBLER__ */
        !            34: #define __DECL_CONST(x, s)  x##s
        !            35: #define DECL_CONST(x, s)    __DECL_CONST(x, s)
        !            36: #endif /* __ASSEMBLER__ */
        !            37: 
        !            38: #define STRLEN(x)           (sizeof(x) - 1)
        !            39: #define ARRAY_SIZE(x)       (sizeof(x) / sizeof((x)[0]))
        !            40: 
        !            41: #define MIN(a, b)           ((a) < (b) ? (a) : (b))
        !            42: #define MAX(a, b)           ((a) > (b) ? (a) : (b))
        !            43: 
        !            44: #define DIV_CEIL(n, d)      (((n) + (d) - 1) / (d))
        !            45: 
        !            46: #define P2ALIGNED(x, a)     (((x) & ((a) - 1)) == 0)
        !            47: #define ISP2(x)             P2ALIGNED(x, x)
        !            48: #define P2ALIGN(x, a)       ((x) & -(a))
        !            49: #define P2ROUND(x, a)       (-(-(x) & -(a)))
        !            50: #define P2END(x, a)         (-(~(x) & -(a)))
        !            51: 
        !            52: #define structof(ptr, type, member) \
        !            53:     ((type *)((char *)(ptr) - offsetof(type, member)))
        !            54: 
        !            55: #define access_once(x)      (*(volatile typeof(x) *)&(x))
        !            56: 
        !            57: #define alignof(x)          __alignof__(x)
        !            58: 
        !            59: #ifndef likely
        !            60: #define likely(expr)        __builtin_expect(!!(expr), 1)
        !            61: #endif /* likely */
        !            62: #ifndef unlikely
        !            63: #define unlikely(expr)      __builtin_expect(!!(expr), 0)
        !            64: #endif /* unlikely */
        !            65: 
        !            66: #ifndef barrier
        !            67: #define barrier()           asm volatile("" : : : "memory")
        !            68: #endif /* barrier */
        !            69: 
        !            70: #define __noreturn          __attribute__((noreturn))
        !            71: #define __aligned(x)        __attribute__((aligned(x)))
        !            72: #define __always_inline     inline __attribute__((always_inline))
        !            73: #ifndef __section
        !            74: #define __section(x)        __attribute__((section(x)))
        !            75: #endif /* __section */
        !            76: #define __packed            __attribute__((packed))
        !            77: #define __alias(x)          __attribute__((alias(x)))
        !            78: 
        !            79: #define __format_printf(fmt, args) \
        !            80:     __attribute__((format(printf, fmt, args)))
        !            81: 
        !            82: #endif /* _KERN_MACROS_H */

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