[ASan] Added __cplusplus guard around the C++ code so it is safe to include asan_mapping.h in assembly files.

[kstoimenov]

Summary

This will avoid addind asan_shadow_defines.h in D114558.

[kstoimenov]

Fixed compile error.

[kstoimenov]

Added an error message.

[kstoimenov]

Fixed message.

[kstoimenov]

Removed quotes.

[kstoimenov]

Lint.

[kstoimenov]

More lint.

[vitalybuka]

compiler-rt/lib/asan/asan_mapping.h

219

can you please clang-format entire file in a separate patch and rebase?

[vitalybuka]

compiler-rt/lib/asan/asan_mapping.h

198–203

actually clangformat in this file + c++ guard is OK

This errors" are probably redundant

[kstoimenov]

[ASan] Ran clang-format on asan_mappings.h.

[kstoimenov]

compiler-rt/lib/asan/asan_mapping.h

198–203

Not sure what you mean by this? What would you like me to do?

219

See D115371.

[vitalybuka]

compiler-rt/lib/asan/asan_mapping.h

198–203

I wanted to say patch as-is was ok.
But errors probably unnecessary as ASAN_SHADOW_SCALE set to 3

[kstoimenov]

After pull.

compiler-rt/lib/asan/asan_mapping.h

 //===-- asan_mapping.h ------------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This file is a part of AddressSanitizer, an address sanity checker.
 //
 // Defines ASan memory mapping.
 //===----------------------------------------------------------------------===//
 #ifndef ASAN_MAPPING_H
 #define ASAN_MAPPING_H
 
-#include "asan_internal.h"
-
 // The full explanation of the memory mapping could be found here:
 // https://github.com/google/sanitizers/wiki/AddressSanitizerAlgorithm
 //
 // Typical shadow mapping on Linux/x86_64 with SHADOW_OFFSET == 0x00007fff8000:
 // || `[0x10007fff8000, 0x7fffffffffff]` || HighMem    ||
 // || `[0x02008fff7000, 0x10007fff7fff]` || HighShadow ||
 // || `[0x00008fff7000, 0x02008fff6fff]` || ShadowGap  ||
 // || `[0x00007fff8000, 0x00008fff6fff]` || LowShadow  ||

 // || `[0x50000000, 0xffffffff]` || HighMem    ||
 // || `[0x3a000000, 0x4fffffff]` || HighShadow ||
 // || `[0x36000000, 0x39ffffff]` || ShadowGap  ||
 // || `[0x30000000, 0x35ffffff]` || LowShadow  ||
 // || `[0x00000000, 0x2fffffff]` || LowMem     ||
 
 #define ASAN_SHADOW_SCALE 3
 
-static const u64 kDefaultShadowSentinel = ~(uptr)0;
-
 #if SANITIZER_FUCHSIA
 #  define ASAN_SHADOW_OFFSET_CONST (0)
 #elif SANITIZER_WORDSIZE == 32
 #  if SANITIZER_ANDROID
 #    define ASAN_SHADOW_OFFSET_DYNAMIC
 #  elif defined(__mips__)
 #    define ASAN_SHADOW_OFFSET_CONST 0x0aaa0000
 #  elif SANITIZER_FREEBSD

 #    define ASAN_SHADOW_OFFSET_CONST 0x0000100000000000
 #  elif defined(__mips64)
 #    define ASAN_SHADOW_OFFSET_CONST 0x0000002000000000
 #  elif defined(__sparc__)
 #    define ASAN_SHADOW_OFFSET_CONST 0x0000080000000000
 #  elif SANITIZER_WINDOWS64
 #    define ASAN_SHADOW_OFFSET_DYNAMIC
 #  else
-#    define ASAN_SHADOW_OFFSET_CONST \
-      0x000000007FFFFFFF & (~0xFFFULL << ASAN_SHADOW_SCALE)
+#    if ASAN_SHADOW_SCALE != 3
+#      error "Value below is based on shadow scale = 3."
+#      error "Original formula was: "0x7FFFFFFF & (~0xFFFULL << SHADOW_SCALE)"."
+#    endif
+#    define ASAN_SHADOW_OFFSET_CONST 0x000000007fff8000
 #  endif
 #endif
 
-#if defined(ASAN_SHADOW_OFFSET_CONST)
+#if defined(__cplusplus)
+#  include "asan_internal.h"
+
+static const u64 kDefaultShadowSentinel = ~(uptr)0;
+
+#  if defined(ASAN_SHADOW_OFFSET_CONST)
 static const u64 kConstShadowOffset = ASAN_SHADOW_OFFSET_CONST;
 #  define ASAN_SHADOW_OFFSET kConstShadowOffset
 #elif defined(ASAN_SHADOW_OFFSET_DYNAMIC)
 #  define ASAN_SHADOW_OFFSET __asan_shadow_memory_dynamic_address
 #else
 #  error "ASAN_SHADOW_OFFSET can't be determined."
 #endif
 
 #if SANITIZER_ANDROID && defined(__arm__)
 # define ASAN_PREMAP_SHADOW 1
 #else
 # define ASAN_PREMAP_SHADOW 0
 #endif
 
 #define ASAN_SHADOW_GRANULARITY (1ULL << ASAN_SHADOW_SCALE)
 
static inline bool AddressIsPoisoned(uptr a) {
   return false;
 }
 
 // Must be after all calls to PROFILE_ASAN_MAPPING().
 static const uptr kAsanMappingProfileSize = __LINE__;
 
 }  // namespace __asan
 
+#endif  // __cplusplus
+
 #endif  // ASAN_MAPPING_H