blob: b1ce500fe8b3df06a8fca84d6f022b02813000f8 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
Will Deacond1515582017-10-24 11:22:46 +01002#ifndef __LINUX_COMPILER_TYPES_H
Mark Charlebois565cbdc2012-11-20 22:13:10 +01003#error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
4#endif
5
6/* Some compiler specific definitions are overwritten here
7 * for Clang compiler
8 */
Mark Charlebois565cbdc2012-11-20 22:13:10 +01009#define uninitialized_var(x) x = *(&(x))
Arnd Bergmannb41c29b2016-02-08 15:38:32 +010010
11/* same as gcc, this was present in clang-2.6 so we can assume it works
12 * with any version that can compile the kernel
13 */
14#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
Sandipan Das4ca59b12017-11-17 15:27:28 -080015
Paul Lawrence53a98ed2018-02-06 15:36:03 -080016/* all clang versions usable with the kernel support KASAN ABI version 5 */
17#define KASAN_ABI_VERSION 5
18
19/* emulate gcc's __SANITIZE_ADDRESS__ flag */
20#if __has_feature(address_sanitizer)
21#define __SANITIZE_ADDRESS__
22#endif
David Woodhouse87358712018-02-19 10:50:57 +000023
Andrey Konovalov12c8f252018-04-20 14:55:52 -070024#define __no_sanitize_address __attribute__((no_sanitize("address")))
25
Rasmus Villemoesf0907822018-05-08 00:36:27 +020026/*
27 * Not all versions of clang implement the the type-generic versions
28 * of the builtin overflow checkers. Fortunately, clang implements
29 * __has_builtin allowing us to avoid awkward version
30 * checks. Unfortunately, we don't know which version of gcc clang
31 * pretends to be, so the macro may or may not be defined.
32 */
Rasmus Villemoesf0907822018-05-08 00:36:27 +020033#if __has_builtin(__builtin_mul_overflow) && \
34 __has_builtin(__builtin_add_overflow) && \
35 __has_builtin(__builtin_sub_overflow)
36#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
37#endif
Nick Desaulniers815f0dd2018-08-22 16:37:24 -070038
39/* The following are for compatibility with GCC, from compiler-gcc.h,
40 * and may be redefined here because they should not be shared with other
41 * compilers, like ICC.
42 */
43#define barrier() __asm__ __volatile__("" : : : "memory")
44#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
45#define __assume_aligned(a, ...) \
46 __attribute__((__assume_aligned__(a, ## __VA_ARGS__)))