compiler-clang.h 1.6 KB

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  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. /* Compiler specific definitions for Clang compiler */
  6. #define uninitialized_var(x) x = *(&(x))
  7. /* same as gcc, this was present in clang-2.6 so we can assume it works
  8. * with any version that can compile the kernel
  9. */
  10. #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
  11. /* all clang versions usable with the kernel support KASAN ABI version 5 */
  12. #define KASAN_ABI_VERSION 5
  13. #if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer)
  14. /* emulate gcc's __SANITIZE_ADDRESS__ flag */
  15. #define __SANITIZE_ADDRESS__
  16. #define __no_sanitize_address \
  17. __attribute__((no_sanitize("address", "hwaddress")))
  18. #else
  19. #define __no_sanitize_address
  20. #endif
  21. /*
  22. * Not all versions of clang implement the the type-generic versions
  23. * of the builtin overflow checkers. Fortunately, clang implements
  24. * __has_builtin allowing us to avoid awkward version
  25. * checks. Unfortunately, we don't know which version of gcc clang
  26. * pretends to be, so the macro may or may not be defined.
  27. */
  28. #if __has_builtin(__builtin_mul_overflow) && \
  29. __has_builtin(__builtin_add_overflow) && \
  30. __has_builtin(__builtin_sub_overflow)
  31. #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
  32. #endif
  33. /* The following are for compatibility with GCC, from compiler-gcc.h,
  34. * and may be redefined here because they should not be shared with other
  35. * compilers, like ICC.
  36. */
  37. #define barrier() __asm__ __volatile__("" : : : "memory")