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."
6 /* Compiler specific definitions for Clang compiler */
8 #define uninitialized_var(x) x = *(&(x))
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
13 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
15 /* all clang versions usable with the kernel support KASAN ABI version 5 */
16 #define KASAN_ABI_VERSION 5
18 /* emulate gcc's __SANITIZE_ADDRESS__ flag */
19 #if __has_feature(address_sanitizer)
20 #define __SANITIZE_ADDRESS__
23 #define __no_sanitize_address __attribute__((no_sanitize("address")))
26 * Not all versions of clang implement the the type-generic versions
27 * of the builtin overflow checkers. Fortunately, clang implements
28 * __has_builtin allowing us to avoid awkward version
29 * checks. Unfortunately, we don't know which version of gcc clang
30 * pretends to be, so the macro may or may not be defined.
32 #if __has_builtin(__builtin_mul_overflow) && \
33 __has_builtin(__builtin_add_overflow) && \
34 __has_builtin(__builtin_sub_overflow)
35 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
38 /* The following are for compatibility with GCC, from compiler-gcc.h,
39 * and may be redefined here because they should not be shared with other
40 * compilers, like ICC.
42 #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
43 #define __assume_aligned(a, ...) \
44 __attribute__((__assume_aligned__(a, ## __VA_ARGS__)))