compiler-clang.h (3300B)
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/* 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. 58 */ 59#if __has_feature(coverage_sanitizer) 60#define __no_sanitize_coverage __attribute__((no_sanitize("coverage"))) 61#else 62#define __no_sanitize_coverage 63#endif 64 65#if __has_feature(shadow_call_stack) 66# define __noscs __attribute__((__no_sanitize__("shadow-call-stack"))) 67#endif 68 69#define __nocfi __attribute__((__no_sanitize__("cfi"))) 70#define __cficanonical __attribute__((__cfi_canonical_jump_table__)) 71 72#if defined(CONFIG_CFI_CLANG) 73/* 74 * With CONFIG_CFI_CLANG, the compiler replaces function address 75 * references with the address of the function's CFI jump table 76 * entry. The function_nocfi macro always returns the address of the 77 * actual function instead. 78 */ 79#define function_nocfi(x) __builtin_function_start(x) 80#endif 81 82/* 83 * Turn individual warnings and errors on and off locally, depending 84 * on version. 85 */ 86#define __diag_clang(version, severity, s) \ 87 __diag_clang_ ## version(__diag_clang_ ## severity s) 88 89/* Severity used in pragma directives */ 90#define __diag_clang_ignore ignored 91#define __diag_clang_warn warning 92#define __diag_clang_error error 93 94#define __diag_str1(s) #s 95#define __diag_str(s) __diag_str1(s) 96#define __diag(s) _Pragma(__diag_str(clang diagnostic s)) 97 98#if CONFIG_CLANG_VERSION >= 110000 99#define __diag_clang_11(s) __diag(s) 100#else 101#define __diag_clang_11(s) 102#endif 103 104#define __diag_ignore_all(option, comment) \ 105 __diag_clang(11, ignore, option)