src/lxc/compiler.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #ifndef __LXC_COMPILER_H
   4 #define __LXC_COMPILER_H
   5
   6 #ifndef _GNU_SOURCE
   7 #define _GNU_SOURCE 1
   8 #endif
   9
  10 #include "config.h"
  11
  12 #ifndef thread_local
  13 #if __STDC_VERSION__ >= 201112L &&    \
  14     !(defined(__STDC_NO_THREADS__) || \
  15       (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
  16 #define thread_local _Thread_local
  17 #else
  18 #define thread_local __thread
  19 #endif
  20 #endif
  21
  22 #if __GNUC__ >= 7
  23 #define __fallthrough __attribute__((__fallthrough__))
  24 #else
  25 #define __fallthrough /* fall through */
  26 #endif
  27
  28 #ifndef __noreturn
  29 #       if __STDC_VERSION__ >= 201112L
  30 #               if !IS_BIONIC
  31 #                       define __noreturn _Noreturn
  32 #               else
  33 #                       define __noreturn __attribute__((__noreturn__))
  34 #               endif
  35 #       elif IS_BIONIC
  36 #               define __noreturn __attribute__((__noreturn__))
  37 #       else
  38 #               define __noreturn __attribute__((noreturn))
  39 #       endif
  40 #endif
  41
  42 #ifndef __hot
  43 #       define __hot __attribute__((hot))
  44 #endif
  45
  46 #ifndef __returns_twice
  47 #define __returns_twice __attribute__((returns_twice))
  48 #endif
  49
  50 /* This attribute is required to silence clang warnings */
  51 #if defined(__GNUC__)
  52 #define __lxc_unused __attribute__ ((unused))
  53 #else
  54 #define __lxc_unused
  55 #endif
  56
  57 /* Indicates taking ownership */
  58 #define __owns
  59
  60 #define __cgfsng_ops
  61
  62 /* access attribute */
  63 #define __access_r_nosize(x)
  64 #define __access_r(x, y)
  65 #define __access_w(x, y)
  66 #define __access_rw(x, y)
  67
  68 #ifdef __has_attribute
  69 #if __has_attribute(access)
  70 #undef __access_r
  71 #define __access_r(x, y) __attribute__((access(read_only, x, y)))
  72
  73 #undef __access_r_nosize
  74 #define __access_r_nosize(x) __attribute__((access(read_only, x)))
  75
  76 #undef __access_w
  77 #define __access_w(x, y) __attribute__((access(write_only, x, y)))
  78
  79 #undef __access_rw
  80 #define __access_rw(x, y) __attribute__((access(read_write, x, y)))
  81 #endif
  82 #endif
  83
  84 #ifndef __hidden
  85 #define __hidden __attribute__((visibility("hidden")))
  86 #endif
  87
  88 #ifndef __public
  89 #define __public __attribute__((visibility("default")))
  90 #endif
  91
  92 #define likely(x) __builtin_expect(!!(x), 1)
  93 #define unlikely(x) __builtin_expect(!!(x), 0)
  94
  95 #endif /* __LXC_COMPILER_H */