src/built-in.h

   1 #ifndef BUILT_IN_H
   2 #define BUILT_IN_H
   3
   4 #ifndef __aligned_16
   5 # define __aligned_16           __attribute__((aligned(16)))
   6 #endif
   7
   8 #ifndef likely
   9 # define likely(x)              __builtin_expect(!!(x), 1)
  10 #endif
  11
  12 #ifndef unlikely
  13 # define unlikely(x)            __builtin_expect(!!(x), 0)
  14 #endif
  15
  16 #ifndef __extension__
  17 # define __extension__
  18 #endif
  19
  20 #ifndef __deprecated
  21 # define __deprecated           /* unimplemented */
  22 #endif
  23
  24 #ifndef __read_mostly
  25 # define __read_mostly          __attribute__((__section__(".data.read_mostly")))
  26 #endif
  27
  28 #ifndef __always_inline
  29 # define __always_inline        inline
  30 #endif
  31
  32 #ifndef __hidden
  33 # define __hidden               __attribute__((visibility("hidden")))
  34 #endif
  35
  36 #ifndef array_size
  37 # define array_size(x)          (sizeof(x) / sizeof((x)[0]) + __must_be_array(x))
  38 #endif
  39
  40 #ifndef __must_be_array
  41 # define __must_be_array(x)             \
  42         build_bug_on_zero(__builtin_types_compatible_p(typeof(x), typeof(&x[0])))
  43 #endif
  44
  45 #ifndef max
  46 # define max(a, b)                      \
  47         ({                              \
  48                 typeof (a) _a = (a);    \
  49                 typeof (b) _b = (b);    \
  50                 _a > _b ? _a : _b;      \
  51         })
  52 #endif
  53
  54 #ifndef min
  55 # define min(a, b)                      \
  56         ({                              \
  57                 typeof (a) _a = (a);    \
  58                 typeof (b) _b = (b);    \
  59                 _a < _b ? _a : _b;      \
  60         })
  61 #endif
  62
  63 #ifndef bug
  64 # define bug()                  __builtin_trap()
  65 #endif
  66
  67 #ifndef build_bug_on_zero
  68 # define build_bug_on_zero(e)   (sizeof(char[1 - 2 * !!(e)]) - 1)
  69 #endif
  70
  71 #endif /* BUILT_IN_H */