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 #if __has_feature(thread_sanitizer) 28 /* emulate gcc's __SANITIZE_THREAD__ flag */ 29 #define __SANITIZE_THREAD__ 30 #define __no_sanitize_thread \ 31 __attribute__((no_sanitize("thread"))) 32 #else 33 #define __no_sanitize_thread 34 #endif 35 36 #if __has_feature(undefined_behavior_sanitizer) 37 /* GCC does not have __SANITIZE_UNDEFINED__ */ 38 #define __no_sanitize_undefined \ 39 __attribute__((no_sanitize("undefined"))) 40 #else 41 #define __no_sanitize_undefined 42 #endif 43 44 /* 45 * Not all versions of clang implement the the type-generic versions 46 * of the builtin overflow checkers. Fortunately, clang implements 47 * __has_builtin allowing us to avoid awkward version 48 * checks. Unfortunately, we don't know which version of gcc clang 49 * pretends to be, so the macro may or may not be defined. 50 */ 51 #if __has_builtin(__builtin_mul_overflow) && \ 52 __has_builtin(__builtin_add_overflow) && \ 53 __has_builtin(__builtin_sub_overflow) 54 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1 55 #endif 56 57 /* The following are for compatibility with GCC, from compiler-gcc.h, 58 * and may be redefined here because they should not be shared with other 59 * compilers, like ICC. 60 */ 61 #define barrier() __asm__ __volatile__("" : : : "memory") 62 63 #if __has_feature(shadow_call_stack) 64 # define __noscs __attribute__((__no_sanitize__("shadow-call-stack"))) 65 #endif 66