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 /* Some compiler specific definitions are overwritten here 7 * for Clang compiler 8 */ 9 #define uninitialized_var(x) x = *(&(x)) 10 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__) 15 16 /* 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 23 24 #define __no_sanitize_address __attribute__((no_sanitize("address"))) 25 26 /* 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 */ 33 #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 38 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__))) 47
