LXR linux/include/linux/compiler-clang.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __LINUX_COMPILER_TYPES_H
   3#error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
   4#endif
   5
   6/* Compiler specific definitions for Clang compiler */
   7
   8/* same as gcc, this was present in clang-2.6 so we can assume it works
   9 * with any version that can compile the kernel
  10 */
  11#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
  12
  13/* all clang versions usable with the kernel support KASAN ABI version 5 */
  14#define KASAN_ABI_VERSION 5
  15
  16#if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer)
  17/* Emulate GCC's __SANITIZE_ADDRESS__ flag */
  18#define __SANITIZE_ADDRESS__
  19#define __no_sanitize_address \
  20                __attribute__((no_sanitize("address", "hwaddress")))
  21#else
  22#define __no_sanitize_address
  23#endif
  24
  25#if __has_feature(thread_sanitizer)
  26/* emulate gcc's __SANITIZE_THREAD__ flag */
  27#define __SANITIZE_THREAD__
  28#define __no_sanitize_thread \
  29                __attribute__((no_sanitize("thread")))
  30#else
  31#define __no_sanitize_thread
  32#endif
  33
  34#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP)
  35#define __HAVE_BUILTIN_BSWAP32__
  36#define __HAVE_BUILTIN_BSWAP64__
  37#define __HAVE_BUILTIN_BSWAP16__
  38#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
  39
  40#if __has_feature(undefined_behavior_sanitizer)
  41/* GCC does not have __SANITIZE_UNDEFINED__ */
  42#define __no_sanitize_undefined \
  43                __attribute__((no_sanitize("undefined")))
  44#else
  45#define __no_sanitize_undefined
  46#endif
  47
  48/*
  49 * Not all versions of clang implement the type-generic versions
  50 * of the builtin overflow checkers. Fortunately, clang implements
  51 * __has_builtin allowing us to avoid awkward version
  52 * checks. Unfortunately, we don't know which version of gcc clang
  53 * pretends to be, so the macro may or may not be defined.
  54 */
  55#if __has_builtin(__builtin_mul_overflow) && \
  56    __has_builtin(__builtin_add_overflow) && \
  57    __has_builtin(__builtin_sub_overflow)
  58#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
  59#endif
  60
  61#if __has_feature(shadow_call_stack)
  62# define __noscs        __attribute__((__no_sanitize__("shadow-call-stack")))
  63#endif
  64
  65#define __nocfi         __attribute__((__no_sanitize__("cfi")))
  66#define __cficanonical  __attribute__((__cfi_canonical_jump_table__))
  67