firmware/include/gcc_extensions.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  *
   9  * Copyright © 2010 Rafaël Carré
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  17  * KIND, either express or implied.
  18  *
  19  ****************************************************************************/
  20
  21 #ifndef _GCC_EXTENSIONS_H_
  22 #define _GCC_EXTENSIONS_H_
  23
  24 /* Support for some GCC extensions */
  25
  26 /* Compile time check of format for printf/scanf like functions */
  27 #ifdef __GNUC__
  28 #define ATTRIBUTE_PRINTF(fmt, arg1) __attribute__( ( format( printf, fmt, arg1 ) ) )
  29 #define ATTRIBUTE_SCANF(fmt, arg1) __attribute__( ( format( scanf, fmt, arg1 ) ) )
  30 #else
  31 #define ATTRIBUTE_PRINTF(fmt, arg1)
  32 #define ATTRIBUTE_SCANF(fmt, arg1)
  33 #endif
  34
  35
  36 /* Use to give gcc hints on which branch is most likely taken */
  37 #if defined(__GNUC__) && __GNUC__ >= 3
  38 #define LIKELY(x)   __builtin_expect(!!(x), 1)
  39 #define UNLIKELY(x) __builtin_expect(!!(x), 0)
  40 #else
  41 #define LIKELY(x)   (x)
  42 #define UNLIKELY(x) (x)
  43 #endif
  44
  45
  46 #if defined(__GNUC__) && (__GNUC__ >= 3 || \
  47                     (__GNUC__ >= 2 && __GNUC_MINOR__ >= 5))
  48 #define NORETURN_ATTR __attribute__((noreturn))
  49 #else
  50 #define NORETURN_ATTR
  51 #endif
  52
  53
  54 #if defined(__GNUC__)
  55 #define FORCE_INLINE inline __attribute__((always_inline))
  56 #else
  57 #define FORCE_INLINE inline
  58 #endif
  59
  60 #endif /* _GCC_EXTENSIONS_H_ */