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 __has_feature(undefined_behavior_sanitizer)
35/* GCC does not have __SANITIZE_UNDEFINED__ */
36#define __no_sanitize_undefined \
37		__attribute__((no_sanitize("undefined")))
38#else
39#define __no_sanitize_undefined
40#endif
41
42/*
43 * Not all versions of clang implement the type-generic versions
44 * of the builtin overflow checkers. Fortunately, clang implements
45 * __has_builtin allowing us to avoid awkward version
46 * checks. Unfortunately, we don't know which version of gcc clang
47 * pretends to be, so the macro may or may not be defined.
48 */
49#if __has_builtin(__builtin_mul_overflow) && \
50    __has_builtin(__builtin_add_overflow) && \
51    __has_builtin(__builtin_sub_overflow)
52#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
53#endif
54
55/* The following are for compatibility with GCC, from compiler-gcc.h,
56 * and may be redefined here because they should not be shared with other
57 * compilers, like ICC.
58 */
59#define barrier() __asm__ __volatile__("" : : : "memory")
60
61#if __has_feature(shadow_call_stack)
62# define __noscs	__attribute__((__no_sanitize__("shadow-call-stack")))
63#endif