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."
   4 #endif
   5
   6 #define CLANG_VERSION (__clang_major__ * 10000  \
   7                      + __clang_minor__ * 100    \
   8                      + __clang_patchlevel__)
   9
  10 #if CLANG_VERSION < 100001
  11 #ifndef __BPF_TRACING__
  12 # error Sorry, your version of Clang is too old - please use 10.0.1 or newer.
  13 #endif
  14 #endif
  15
  16 /* Compiler specific definitions for Clang compiler */
  17
  18 /* same as gcc, this was present in clang-2.6 so we can assume it works
  19  * with any version that can compile the kernel
  20  */
  21 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
  22
  23 /* all clang versions usable with the kernel support KASAN ABI version 5 */
  24 #define KASAN_ABI_VERSION 5
  25
  26 /*
  27  * Note: Checking __has_feature(*_sanitizer) is only true if the feature is
  28  * enabled. Therefore it is not required to additionally check defined(CONFIG_*)
  29  * to avoid adding redundant attributes in other configurations.
  30  */
  31
  32 #if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer)
  33 /* Emulate GCC's __SANITIZE_ADDRESS__ flag */
  34 #define __SANITIZE_ADDRESS__
  35 #define __no_sanitize_address \
  36                 __attribute__((no_sanitize("address", "hwaddress")))
  37 #else
  38 #define __no_sanitize_address
  39 #endif
  40
  41 #if __has_feature(thread_sanitizer)
  42 /* emulate gcc's __SANITIZE_THREAD__ flag */
  43 #define __SANITIZE_THREAD__
  44 #define __no_sanitize_thread \
  45                 __attribute__((no_sanitize("thread")))
  46 #else
  47 #define __no_sanitize_thread
  48 #endif
  49
  50 #if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP)
  51 #define __HAVE_BUILTIN_BSWAP32__
  52 #define __HAVE_BUILTIN_BSWAP64__
  53 #define __HAVE_BUILTIN_BSWAP16__
  54 #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
  55
  56 #if __has_feature(undefined_behavior_sanitizer)
  57 /* GCC does not have __SANITIZE_UNDEFINED__ */
  58 #define __no_sanitize_undefined \
  59                 __attribute__((no_sanitize("undefined")))
  60 #else
  61 #define __no_sanitize_undefined
  62 #endif
  63
  64 /*
  65  * Support for __has_feature(coverage_sanitizer) was added in Clang 13 together
  66  * with no_sanitize("coverage"). Prior versions of Clang support coverage
  67  * instrumentation, but cannot be queried for support by the preprocessor.
  68  */
  69 #if __has_feature(coverage_sanitizer)
  70 #define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
  71 #else
  72 #define __no_sanitize_coverage
  73 #endif
  74
  75 /*
  76  * Not all versions of clang implement the type-generic versions
  77  * of the builtin overflow checkers. Fortunately, clang implements
  78  * __has_builtin allowing us to avoid awkward version
  79  * checks. Unfortunately, we don't know which version of gcc clang
  80  * pretends to be, so the macro may or may not be defined.
  81  */
  82 #if __has_builtin(__builtin_mul_overflow) && \
  83     __has_builtin(__builtin_add_overflow) && \
  84     __has_builtin(__builtin_sub_overflow)
  85 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
  86 #endif
  87
  88 #if __has_feature(shadow_call_stack)
  89 # define __noscs        __attribute__((__no_sanitize__("shadow-call-stack")))
  90 #endif