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#define uninitialized_var(x) x = *(&(x))
9
10/* same as gcc, this was present in clang-2.6 so we can assume it works
11 * with any version that can compile the kernel
12 */
13#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
14
15/* all clang versions usable with the kernel support KASAN ABI version 5 */
16#define KASAN_ABI_VERSION 5
17
18#if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer)
19/* emulate gcc's __SANITIZE_ADDRESS__ flag */
20#define __SANITIZE_ADDRESS__
21#define __no_sanitize_address \
22 __attribute__((no_sanitize("address", "hwaddress")))
23#else
24#define __no_sanitize_address
25#endif
26
27/*
28 * Not all versions of clang implement the the type-generic versions
29 * of the builtin overflow checkers. Fortunately, clang implements
30 * __has_builtin allowing us to avoid awkward version
31 * checks. Unfortunately, we don't know which version of gcc clang
32 * pretends to be, so the macro may or may not be defined.
33 */
34#if __has_builtin(__builtin_mul_overflow) && \
35 __has_builtin(__builtin_add_overflow) && \
36 __has_builtin(__builtin_sub_overflow)
37#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
38#endif
39
40/* The following are for compatibility with GCC, from compiler-gcc.h,
41 * and may be redefined here because they should not be shared with other
42 * compilers, like ICC.
43 */
44#define barrier() __asm__ __volatile__("" : : : "memory")
45