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 #if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer) 20 /* emulate gcc's __SANITIZE_ADDRESS__ flag */ 21 #define __SANITIZE_ADDRESS__ 22 #define __no_sanitize_address \ 23 __attribute__((no_sanitize("address", "hwaddress"))) 24 #else 25 #define __no_sanitize_address 26 #endif 27 28 /* 29 * Not all versions of clang implement the the type-generic versions 30 * of the builtin overflow checkers. Fortunately, clang implements 31 * __has_builtin allowing us to avoid awkward version 32 * checks. Unfortunately, we don't know which version of gcc clang 33 * pretends to be, so the macro may or may not be defined. 34 */ 35 #if __has_builtin(__builtin_mul_overflow) && \ 36 __has_builtin(__builtin_add_overflow) && \ 37 __has_builtin(__builtin_sub_overflow) 38 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1 39 #endif 40 41 /* The following are for compatibility with GCC, from compiler-gcc.h, 42 * and may be redefined here because they should not be shared with other 43 * compilers, like ICC. 44 */ 45 #define barrier() __asm__ __volatile__("" : : : "memory") 46