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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/linux/compiler-clang.h
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."
6 /* Compiler specific definitions for Clang compiler */
8 /* same as gcc, this was present in clang-2.6 so we can assume it works
9 * with any version that can compile the kernel
11 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
13 /* all clang versions usable with the kernel support KASAN ABI version 5 */
14 #define KASAN_ABI_VERSION 5
17 * Note: Checking __has_feature(*_sanitizer) is only true if the feature is
18 * enabled. Therefore it is not required to additionally check defined(CONFIG_*)
19 * to avoid adding redundant attributes in other configurations.
22 #if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer)
23 /* Emulate GCC's __SANITIZE_ADDRESS__ flag */
24 #define __SANITIZE_ADDRESS__
25 #define __no_sanitize_address \
26 __attribute__((no_sanitize("address", "hwaddress")))
28 #define __no_sanitize_address
31 #if __has_feature(thread_sanitizer)
32 /* emulate gcc's __SANITIZE_THREAD__ flag */
33 #define __SANITIZE_THREAD__
34 #define __no_sanitize_thread \
35 __attribute__((no_sanitize("thread")))
37 #define __no_sanitize_thread
40 #if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP)
41 #define __HAVE_BUILTIN_BSWAP32__
42 #define __HAVE_BUILTIN_BSWAP64__
43 #define __HAVE_BUILTIN_BSWAP16__
44 #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
46 #if __has_feature(undefined_behavior_sanitizer)
47 /* GCC does not have __SANITIZE_UNDEFINED__ */
48 #define __no_sanitize_undefined \
49 __attribute__((no_sanitize("undefined")))
51 #define __no_sanitize_undefined
55 * Support for __has_feature(coverage_sanitizer) was added in Clang 13 together
56 * with no_sanitize("coverage"). Prior versions of Clang support coverage
57 * instrumentation, but cannot be queried for support by the preprocessor.
59 #if __has_feature(coverage_sanitizer)
60 #define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
62 #define __no_sanitize_coverage
66 * Not all versions of clang implement the type-generic versions
67 * of the builtin overflow checkers. Fortunately, clang implements
68 * __has_builtin allowing us to avoid awkward version
69 * checks. Unfortunately, we don't know which version of gcc clang
70 * pretends to be, so the macro may or may not be defined.
72 #if __has_builtin(__builtin_mul_overflow) && \
73 __has_builtin(__builtin_add_overflow) && \
74 __has_builtin(__builtin_sub_overflow)
75 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
78 #if __has_feature(shadow_call_stack)
79 # define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
82 #define __nocfi __attribute__((__no_sanitize__("cfi")))
83 #define __cficanonical __attribute__((__cfi_canonical_jump_table__))