Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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/* 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
10 */
11#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
12
13/* all clang versions usable with the kernel support KASAN ABI version 5 */
14#define KASAN_ABI_VERSION 5
15
16/*
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.
20 */
21
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")))
27#else
28#define __no_sanitize_address
29#endif
30
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")))
36#else
37#define __no_sanitize_thread
38#endif
39
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 */
45
46#if __has_feature(undefined_behavior_sanitizer)
47/* GCC does not have __SANITIZE_UNDEFINED__ */
48#define __no_sanitize_undefined \
49 __attribute__((no_sanitize("undefined")))
50#else
51#define __no_sanitize_undefined
52#endif
53
54#if __has_feature(memory_sanitizer)
55#define __SANITIZE_MEMORY__
56/*
57 * Unlike other sanitizers, KMSAN still inserts code into functions marked with
58 * no_sanitize("kernel-memory"). Using disable_sanitizer_instrumentation
59 * provides the behavior consistent with other __no_sanitize_ attributes,
60 * guaranteeing that __no_sanitize_memory functions remain uninstrumented.
61 */
62#define __no_sanitize_memory __disable_sanitizer_instrumentation
63
64/*
65 * The __no_kmsan_checks attribute ensures that a function does not produce
66 * false positive reports by:
67 * - initializing all local variables and memory stores in this function;
68 * - skipping all shadow checks;
69 * - passing initialized arguments to this function's callees.
70 */
71#define __no_kmsan_checks __attribute__((no_sanitize("kernel-memory")))
72#else
73#define __no_sanitize_memory
74#define __no_kmsan_checks
75#endif
76
77/*
78 * Support for __has_feature(coverage_sanitizer) was added in Clang 13 together
79 * with no_sanitize("coverage"). Prior versions of Clang support coverage
80 * instrumentation, but cannot be queried for support by the preprocessor.
81 */
82#if __has_feature(coverage_sanitizer)
83#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
84#else
85#define __no_sanitize_coverage
86#endif
87
88#if __has_feature(shadow_call_stack)
89# define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
90#endif
91
92#if __has_feature(kcfi)
93/* Disable CFI checking inside a function. */
94#define __nocfi __attribute__((__no_sanitize__("kcfi")))
95#endif
96
97/*
98 * Turn individual warnings and errors on and off locally, depending
99 * on version.
100 */
101#define __diag_clang(version, severity, s) \
102 __diag_clang_ ## version(__diag_clang_ ## severity s)
103
104/* Severity used in pragma directives */
105#define __diag_clang_ignore ignored
106#define __diag_clang_warn warning
107#define __diag_clang_error error
108
109#define __diag_str1(s) #s
110#define __diag_str(s) __diag_str1(s)
111#define __diag(s) _Pragma(__diag_str(clang diagnostic s))
112
113#if CONFIG_CLANG_VERSION >= 110000
114#define __diag_clang_11(s) __diag(s)
115#else
116#define __diag_clang_11(s)
117#endif
118
119#define __diag_ignore_all(option, comment) \
120 __diag_clang(11, ignore, option)