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#if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer) 19/* emulate gcc's __SANITIZE_ADDRESS__ flag */ 20#define __SANITIZE_ADDRESS__ 21#define __no_sanitize_address \ 22 __attribute__((no_sanitize("address", "hwaddress"))) 23#else 24#define __no_sanitize_address 25#endif 26 27/* 28 * Not all versions of clang implement the the type-generic versions 29 * of the builtin overflow checkers. Fortunately, clang implements 30 * __has_builtin allowing us to avoid awkward version 31 * checks. Unfortunately, we don't know which version of gcc clang 32 * pretends to be, so the macro may or may not be defined. 33 */ 34#if __has_builtin(__builtin_mul_overflow) && \ 35 __has_builtin(__builtin_add_overflow) && \ 36 __has_builtin(__builtin_sub_overflow) 37#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1 38#endif 39 40/* The following are for compatibility with GCC, from compiler-gcc.h, 41 * and may be redefined here because they should not be shared with other 42 * compilers, like ICC. 43 */ 44#define barrier() __asm__ __volatile__("" : : : "memory") 45