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 | |