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 /* emulate gcc's __SANITIZE_ADDRESS__ flag */ 19 #if __has_feature(address_sanitizer) 20 #define __SANITIZE_ADDRESS__ 21 #endif 22 23 #define __no_sanitize_address __attribute__((no_sanitize("address"))) 24 25 /* 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. 31 */ 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 36 #endif 37 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. 41 */ 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__))) 45