[libc][NFC] Add noreturn and constexpr qualifiers where appropriate

[gAlfonso-bit]

Summary

These functions make it clear to the compiler and user what the intended
behavior is so llvm can make them go as fast as possible.

[abrachet]

noexcept is superfluous because all LLVM is compiled with -fno-exceptions

[gAlfonso-bit]

Well that helps me out a LOT.

[lebedev.ri]

There's LLVM_ENABLE_EH cmake switch, not sure how it affects llvmlibc.

[sivachandra]

I have marked those files in which the changes are OK. Please update and I can submit this patch for you.

libc/src/__support/integer_operations.h

14

Changes in this file OK.

libc/src/ctype/ctype_utils.h

18

Changes in this file OK.

libc/utils/HdrGen/Command.h

36

Changes in this file OK.

llvm/include/llvm/Support/Compiler.h

27

You will need to move the changes in this file out to a different patch and get it reviewed by a suitable reviewer. Also, as I have suggested previously, do not mixup style cleanups with the actual intention of the patches.

[gAlfonso-bit]

Fixed according to feedback

[gAlfonso-bit]

Moved ctype function changes to its own diff. This diff now has every requested change!

[gAlfonso-bit]

@sivachandra All done!

[gAlfonso-bit]

@sivachandra Everything is ready for landing!

[gAlfonso-bit]

@ldionne May I ask if this is acceptable?

[gAlfonso-bit]

Rebased to LLVM 13's Release Branch

[sivachandra]

The frequent updates and repeated pinging of reviewers is almost like spamming us.
Please see https://llvm.org/docs/Contributing.html#how-to-submit-a-patch where it says that a good practice is to ping after a week of silence.

Again, don't get me wrong - I totally appreciate you doing this but we all have our own jobs and work which makes patches like this drop down in priority. That said, I have accepted this patch and will submit it for you some time day (US west coast time).

[gAlfonso-bit]

In D106807#2910599, @sivachandra wrote:

The frequent updates and repeated pinging of reviewers is almost like spamming us.
Please see https://llvm.org/docs/Contributing.html#how-to-submit-a-patch where it says that a good practice is to ping after a week of silence.

Again, don't get me wrong - I totally appreciate you doing this but we all have our own jobs and work which makes patches like this drop down in priority. That said, I have accepted this patch and will submit it for you some time day (US west coast time).

Ok, I read it. I apologize and should have read it earlier. I am sorry.

I was in a rush since I was hoping to get my changes in the release branch.

I definitely should have considered the people I was pinging first though. I will follow these guidelines from now on.

libc/src/__support/integer_operations.h

 namespace __llvm_libc {
 
 template <typename T>
-static inline cpp::EnableIfType<cpp::IsIntegral<T>::Value, T> integerAbs(T n) {
-  if (n < 0)
-    return -n;
-  return n;
+static constexpr cpp::EnableIfType<cpp::IsIntegral<T>::Value, T>
+integerAbs(T n) {
+  return (n < 0) ? -n : n;
 }
 
 } // namespace __llvm_libc

libc/src/ctype/ctype_utils.h

 // of a function call by inlining them.
 // ------------------------------------------------------
 
-static inline int isalpha(unsigned ch) { return (ch | 32) - 'a' < 26; }
+static constexpr int isalpha(unsigned ch) { return (ch | 32) - 'a' < 26; }
 
-static inline int isdigit(unsigned ch) { return (ch - '0') < 10; }
+static constexpr int isdigit(unsigned ch) { return (ch - '0') < 10; }
 
-static inline int isalnum(unsigned ch) { return isalpha(ch) || isdigit(ch); }
+static constexpr int isalnum(unsigned ch) { return isalpha(ch) || isdigit(ch); }
 
-static inline int isgraph(unsigned ch) { return 0x20 < ch && ch < 0x7f; }
+static constexpr int isgraph(unsigned ch) { return 0x20 < ch && ch < 0x7f; }
 
-static inline int islower(unsigned ch) { return (ch - 'a') < 26; }
+static constexpr int islower(unsigned ch) { return (ch - 'a') < 26; }
 
-static inline int isupper(unsigned ch) { return (ch - 'A') < 26; }
+static constexpr int isupper(unsigned ch) { return (ch - 'A') < 26; }
 
 } // namespace internal
 } // namespace __llvm_libc

libc/src/ctype/isalnum.cpp

 
 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
-LLVM_LIBC_FUNCTION(int, isalnum, (int c)) { return internal::isalnum(c); }
+LLVM_LIBC_FUNCTION(int, isalnum, (int c)) {
+  return internal::isalnum(static_cast<unsigned>(c));
+}
 
 } // namespace __llvm_libc

libc/src/ctype/isalpha.cpp

 
 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
-LLVM_LIBC_FUNCTION(int, isalpha, (int c)) { return internal::isalpha(c); }
+LLVM_LIBC_FUNCTION(int, isalpha, (int c)) {
+  return internal::isalpha(static_cast<unsigned>(c));
+}
 
 } // namespace __llvm_libc

libc/src/ctype/isascii.cpp

 
 namespace __llvm_libc {
 
-LLVM_LIBC_FUNCTION(int, isascii, (int c)) { return (c & (~0x7f)) == 0; }
+LLVM_LIBC_FUNCTION(int, isascii, (int c)) {
+  return static_cast<unsigned>(c) <= 0x7f;
+}
 
 } // namespace __llvm_libc

libc/src/ctype/isblank.cpp

 
 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
-LLVM_LIBC_FUNCTION(int, isblank, (int c)) {
-  const unsigned char ch = static_cast<char>(c);
-  return ch == ' ' || ch == '\t';
-}
+LLVM_LIBC_FUNCTION(int, isblank, (int c)) { return c == ' ' || c == '\t'; }
 
 } // namespace __llvm_libc

libc/src/ctype/iscntrl.cpp

 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
 LLVM_LIBC_FUNCTION(int, iscntrl, (int c)) {
-  const unsigned char ch = static_cast<char>(c);
+  const unsigned ch = static_cast<unsigned>(c);
   return ch < 0x20 || ch == 0x7f;
 }
 

libc/src/ctype/isdigit.cpp

 
 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
-LLVM_LIBC_FUNCTION(int, isdigit, (int c)) { return internal::isdigit(c); }
+LLVM_LIBC_FUNCTION(int, isdigit, (int c)) {
+  return internal::isdigit(static_cast<unsigned>(c));
+}
 
 } // namespace __llvm_libc

libc/src/ctype/isgraph.cpp

 
 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
-LLVM_LIBC_FUNCTION(int, isgraph, (int c)) { return internal::isgraph(c); }
+LLVM_LIBC_FUNCTION(int, isgraph, (int c)) {
+  return internal::isgraph(static_cast<unsigned>(c));
+}
 
 } // namespace __llvm_libc

libc/src/ctype/islower.cpp

 
 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
-LLVM_LIBC_FUNCTION(int, islower, (int c)) { return internal::islower(c); }
+LLVM_LIBC_FUNCTION(int, islower, (int c)) {
+  return internal::islower(static_cast<unsigned>(c));
+}
 
 } // namespace __llvm_libc

libc/src/ctype/isprint.cpp

 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
 LLVM_LIBC_FUNCTION(int, isprint, (int c)) {
-  const unsigned ch = c;
+  const unsigned ch = static_cast<unsigned>(c);
   return (ch - ' ') < 95;
 }
 

libc/src/ctype/ispunct.cpp

 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
 LLVM_LIBC_FUNCTION(int, ispunct, (int c)) {
-  return !internal::isalnum(c) && internal::isgraph(c);
+  const unsigned ch = static_cast<unsigned>(c);
+  return !internal::isalnum(ch) && internal::isgraph(ch);
 }
 
 } // namespace __llvm_libc

libc/src/ctype/isspace.cpp

 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
 LLVM_LIBC_FUNCTION(int, isspace, (int c)) {
-  const unsigned ch = c;
+  const unsigned ch = static_cast<unsigned>(c);
   return ch == ' ' || (ch - '\t') < 5;
 }
 

libc/src/ctype/isupper.cpp

 
 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
-LLVM_LIBC_FUNCTION(int, isupper, (int c)) { return internal::isupper(c); }
+LLVM_LIBC_FUNCTION(int, isupper, (int c)) {
+  return internal::isupper(static_cast<unsigned>(c));
+}
 
 } // namespace __llvm_libc

libc/src/ctype/isxdigit.cpp

 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
 LLVM_LIBC_FUNCTION(int, isxdigit, (int c)) {
-  const unsigned ch = c;
+  const unsigned ch = static_cast<unsigned>(c);
   return internal::isdigit(ch) || (ch | 32) - 'a' < 6;
 }
 

libc/src/ctype/tolower.cpp

 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
 LLVM_LIBC_FUNCTION(int, tolower, (int c)) {
-  if (internal::isupper(c))
+  if (internal::isupper(static_cast<unsigned>(c)))
     return c + 'a' - 'A';
   return c;
 }

libc/src/ctype/toupper.cpp

 // TODO: Currently restricted to default locale.
 // These should be extended using locale information.
 LLVM_LIBC_FUNCTION(int, toupper, (int c)) {
-  if (internal::islower(c))
+  if (internal::islower(static_cast<unsigned>(c)))
     return c + 'A' - 'a';
   return c;
 }

libc/utils/HdrGen/Command.h

   public:
     ErrorReporter(llvm::SMLoc L, llvm::SourceMgr &SM) : Loc(L), SrcMgr(SM) {}
 
-    void printFatalError(llvm::Twine Msg) const {
+    [[noreturn]] void printFatalError(llvm::Twine Msg) const {
       SrcMgr.PrintMessage(Loc, llvm::SourceMgr::DK_Error, Msg);
       std::exit(1);
     }

llvm/include/llvm/Support/Compiler.h

 #endif
 
 #ifndef __has_feature
-# define __has_feature(x) 0
+#define __has_feature(x) 0
 #endif
 
 #ifndef __has_extension
-# define __has_extension(x) 0
+#define __has_extension(x) 0
 #endif
 
 #ifndef __has_attribute
-# define __has_attribute(x) 0
+#define __has_attribute(x) 0
 #endif
 
 #ifndef __has_builtin
-# define __has_builtin(x) 0
+#define __has_builtin(x) 0
 #endif
 
 // Only use __has_cpp_attribute in C++ mode. GCC defines __has_cpp_attribute in
 // C mode, but the :: in __has_cpp_attribute(scoped::attribute) is invalid.
 #ifndef LLVM_HAS_CPP_ATTRIBUTE
 #if defined(__cplusplus) && defined(__has_cpp_attribute)
-# define LLVM_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
+#define LLVM_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
 #else
-# define LLVM_HAS_CPP_ATTRIBUTE(x) 0
+#define LLVM_HAS_CPP_ATTRIBUTE(x) 0
 #endif
 #endif
 

 /// Extend the default __GNUC_PREREQ even if glibc's features.h isn't
 /// available.
 #ifndef LLVM_GNUC_PREREQ
-# if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
-#  define LLVM_GNUC_PREREQ(maj, min, patch) \
-    ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >= \
-     ((maj) << 20) + ((min) << 10) + (patch))
-# elif defined(__GNUC__) && defined(__GNUC_MINOR__)
-#  define LLVM_GNUC_PREREQ(maj, min, patch) \
-    ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10))
-# else
-#  define LLVM_GNUC_PREREQ(maj, min, patch) 0
-# endif
+#if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
+#define LLVM_GNUC_PREREQ(maj, min, patch)                                      \
+  ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >=          \
+#elif defined(__GNUC__) && defined(__GNUC_MINOR__)
+#define LLVM_GNUC_PREREQ(maj, min, patch)                                      \
+#else
+#define LLVM_GNUC_PREREQ(maj, min, patch) 0
+#endif
 #endif
 
 /// \macro LLVM_MSC_PREREQ

 /// they are linked in to.
 #if (__has_attribute(visibility) || LLVM_GNUC_PREREQ(4, 0, 0)) &&              \
     !defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(_WIN32)
-#define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden")))
-#define LLVM_EXTERNAL_VISIBILITY __attribute__ ((visibility("default")))
+#define LLVM_LIBRARY_VISIBILITY __attribute__((visibility("hidden")))
+#define LLVM_EXTERNAL_VISIBILITY __attribute__((visibility("default")))
 #else
 #define LLVM_LIBRARY_VISIBILITY
 #define LLVM_EXTERNAL_VISIBILITY

 /// LLVM_NODISCARD - Warn if a type or return value is discarded.
 
 // Use the 'nodiscard' attribute in C++17 or newer mode.
-#if defined(__cplusplus) && __cplusplus > 201402L && LLVM_HAS_CPP_ATTRIBUTE(nodiscard)
+#if defined(__cplusplus) && __cplusplus > 201402L &&                           \
+    LLVM_HAS_CPP_ATTRIBUTE(nodiscard)
 #define LLVM_NODISCARD [[nodiscard]]
 #elif LLVM_HAS_CPP_ATTRIBUTE(clang::warn_unused_result)
 #define LLVM_NODISCARD [[clang::warn_unused_result]]

 #define LLVM_ATTRIBUTE_ALWAYS_INLINE inline
 #endif
 
-#ifdef __GNUC__
+// C++14 and up has [[noreturn]]
+#if defined(__cplusplus) && __cplusplus > 201300 ||                            \
+    LLVM_HAS_CPP_ATTRIBUTE(noreturn)
+#define LLVM_ATTRIBUTE_NORETURN [[noreturn]]
+// C11 and up has _Noreturn
+#elif !defined(__cplusplus) && __STDC_VERSION__ > 201112L
+#define LLVM_ATTRIBUTE_NORETURN _Noreturn;
+#elif defined(__GNUC__) || __has_attribute(noreturn)
 #define LLVM_ATTRIBUTE_NORETURN __attribute__((noreturn))
 #elif defined(_MSC_VER)
 #define LLVM_ATTRIBUTE_NORETURN __declspec(noreturn)

 #endif
 
 /// LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements.
-#if defined(__cplusplus) && __cplusplus > 201402L && LLVM_HAS_CPP_ATTRIBUTE(fallthrough)
+#if defined(__cplusplus) && __cplusplus > 201402L &&                           \
+    LLVM_HAS_CPP_ATTRIBUTE(fallthrough)
 #define LLVM_FALLTHROUGH [[fallthrough]]
 #elif LLVM_HAS_CPP_ATTRIBUTE(gnu::fallthrough)
 #define LLVM_FALLTHROUGH [[gnu::fallthrough]]

 /// to an expression which states that it is undefined behavior for the
 /// compiler to reach this point.  Otherwise is not defined.
 #if __has_builtin(__builtin_unreachable) || LLVM_GNUC_PREREQ(4, 5, 0)
-# define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
+#define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
 #elif defined(_MSC_VER)
-# define LLVM_BUILTIN_UNREACHABLE __assume(false)
+#define LLVM_BUILTIN_UNREACHABLE __assume(false)
 #endif
 
 /// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression
 /// which causes the program to exit abnormally.
 #if __has_builtin(__builtin_trap) || LLVM_GNUC_PREREQ(4, 3, 0)
-# define LLVM_BUILTIN_TRAP __builtin_trap()
+#define LLVM_BUILTIN_TRAP __builtin_trap()
 #elif defined(_MSC_VER)
 // The __debugbreak intrinsic is supported by MSVC, does not require forward
 // declarations involving platform-specific typedefs (unlike RaiseException),
 // results in a call to vectored exception handlers, and encodes to a short
 // instruction that still causes the trapping behavior we want.
-# define LLVM_BUILTIN_TRAP __debugbreak()
+#define LLVM_BUILTIN_TRAP __debugbreak()
 #else
-# define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0
+#define LLVM_BUILTIN_TRAP *(volatile int *)0x11 = 0
 #endif
 
 /// LLVM_BUILTIN_DEBUGTRAP - On compilers which support it, expands to
 /// an expression which causes the program to break while running
 /// under a debugger.
 #if __has_builtin(__builtin_debugtrap)
-# define LLVM_BUILTIN_DEBUGTRAP __builtin_debugtrap()
+#define LLVM_BUILTIN_DEBUGTRAP __builtin_debugtrap()
 #elif defined(_MSC_VER)
 // The __debugbreak intrinsic is supported by MSVC and breaks while
 // running under the debugger, and also supports invoking a debugger
 // when the OS is configured appropriately.
-# define LLVM_BUILTIN_DEBUGTRAP __debugbreak()
+#define LLVM_BUILTIN_DEBUGTRAP __debugbreak()
 #else
 // Just continue execution when built with compilers that have no
 // support. This is a debugging aid and not intended to force the
 // program to abort if encountered.
-# define LLVM_BUILTIN_DEBUGTRAP
+#define LLVM_BUILTIN_DEBUGTRAP
 #endif
 
 /// \macro LLVM_ASSUME_ALIGNED
 /// Returns a pointer with an assumed alignment.
 #if __has_builtin(__builtin_assume_aligned) || LLVM_GNUC_PREREQ(4, 7, 0)
-# define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a)
+#define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a)
 #elif defined(LLVM_BUILTIN_UNREACHABLE)
-# define LLVM_ASSUME_ALIGNED(p, a) \
-           (((uintptr_t(p) % (a)) == 0) ? (p) : (LLVM_BUILTIN_UNREACHABLE, (p)))
+#define LLVM_ASSUME_ALIGNED(p, a)                                              \
 #else
-# define LLVM_ASSUME_ALIGNED(p, a) (p)
+#define LLVM_ASSUME_ALIGNED(p, a) (p)
 #endif
 
 /// \macro LLVM_PACKED

 /// };
 /// LLVM_PACKED_END
 #ifdef _MSC_VER
-# define LLVM_PACKED(d) __pragma(pack(push, 1)) d __pragma(pack(pop))
-# define LLVM_PACKED_START __pragma(pack(push, 1))
-# define LLVM_PACKED_END   __pragma(pack(pop))
+#define LLVM_PACKED(d) __pragma(pack(push, 1)) d __pragma(pack(pop))
+#define LLVM_PACKED_START __pragma(pack(push, 1))
+#define LLVM_PACKED_END __pragma(pack(pop))
 #else
-# define LLVM_PACKED(d) d __attribute__((packed))
-# define LLVM_PACKED_START _Pragma("pack(push, 1)")
-# define LLVM_PACKED_END   _Pragma("pack(pop)")
+#define LLVM_PACKED(d) d __attribute__((packed))
+#define LLVM_PACKED_START _Pragma("pack(push, 1)")
+#define LLVM_PACKED_END _Pragma("pack(pop)")
 #endif
 
 /// \macro LLVM_PTR_SIZE

 /// Generally used in combination with alignas or when doing computation in the
 /// preprocessor.
 #ifdef __SIZEOF_POINTER__
-# define LLVM_PTR_SIZE __SIZEOF_POINTER__
+#define LLVM_PTR_SIZE __SIZEOF_POINTER__
 #elif defined(_WIN64)
-# define LLVM_PTR_SIZE 8
+#define LLVM_PTR_SIZE 8
 #elif defined(_WIN32)
-# define LLVM_PTR_SIZE 4
+#define LLVM_PTR_SIZE 4
 #elif defined(_MSC_VER)
-# error "could not determine LLVM_PTR_SIZE as a constant int for MSVC"
+#error "could not determine LLVM_PTR_SIZE as a constant int for MSVC"
 #else
-# define LLVM_PTR_SIZE sizeof(void *)
+#define LLVM_PTR_SIZE sizeof(void *)
 #endif
 
 /// \macro LLVM_MEMORY_SANITIZER_BUILD
 /// Whether LLVM itself is built with MemorySanitizer instrumentation.
 #if __has_feature(memory_sanitizer)
-# define LLVM_MEMORY_SANITIZER_BUILD 1
-# include <sanitizer/msan_interface.h>
-# define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE __attribute__((no_sanitize_memory))
+#define LLVM_MEMORY_SANITIZER_BUILD 1
+#include <sanitizer/msan_interface.h>
+#define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE __attribute__((no_sanitize_memory))
 #else
-# define LLVM_MEMORY_SANITIZER_BUILD 0
-# define __msan_allocated_memory(p, size)
-# define __msan_unpoison(p, size)
-# define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE
+#define LLVM_MEMORY_SANITIZER_BUILD 0
+#define __msan_allocated_memory(p, size)
+#define __msan_unpoison(p, size)
+#define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE
 #endif
 
 /// \macro LLVM_ADDRESS_SANITIZER_BUILD
 /// Whether LLVM itself is built with AddressSanitizer instrumentation.
 #if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
-# define LLVM_ADDRESS_SANITIZER_BUILD 1
-# include <sanitizer/asan_interface.h>
+#define LLVM_ADDRESS_SANITIZER_BUILD 1
+#include <sanitizer/asan_interface.h>
 #else
-# define LLVM_ADDRESS_SANITIZER_BUILD 0
-# define __asan_poison_memory_region(p, size)
-# define __asan_unpoison_memory_region(p, size)
+#define LLVM_ADDRESS_SANITIZER_BUILD 0
+#define __asan_poison_memory_region(p, size)
+#define __asan_unpoison_memory_region(p, size)
 #endif
 
 /// \macro LLVM_THREAD_SANITIZER_BUILD
 /// Whether LLVM itself is built with ThreadSanitizer instrumentation.
 #if __has_feature(thread_sanitizer) || defined(__SANITIZE_THREAD__)
-# define LLVM_THREAD_SANITIZER_BUILD 1
+#define LLVM_THREAD_SANITIZER_BUILD 1
 #else
-# define LLVM_THREAD_SANITIZER_BUILD 0
+#define LLVM_THREAD_SANITIZER_BUILD 0
 #endif
 
 #if LLVM_THREAD_SANITIZER_BUILD

 // This marker is used to define a happens-before arc. The race detector will
 // infer an arc from the begin to the end when they share the same pointer
 // argument.
-# define TsanHappensBefore(cv) AnnotateHappensBefore(__FILE__, __LINE__, cv)
+#define TsanHappensBefore(cv) AnnotateHappensBefore(__FILE__, __LINE__, cv)
 
 // This marker defines the destination of a happens-before arc.
-# define TsanHappensAfter(cv) AnnotateHappensAfter(__FILE__, __LINE__, cv)
+#define TsanHappensAfter(cv) AnnotateHappensAfter(__FILE__, __LINE__, cv)
 
 // Ignore any races on writes between here and the next TsanIgnoreWritesEnd.
-# define TsanIgnoreWritesBegin() AnnotateIgnoreWritesBegin(__FILE__, __LINE__)
+#define TsanIgnoreWritesBegin() AnnotateIgnoreWritesBegin(__FILE__, __LINE__)
 
 // Resume checking for racy writes.
-# define TsanIgnoreWritesEnd() AnnotateIgnoreWritesEnd(__FILE__, __LINE__)
+#define TsanIgnoreWritesEnd() AnnotateIgnoreWritesEnd(__FILE__, __LINE__)
 #else
-# define TsanHappensBefore(cv)
-# define TsanHappensAfter(cv)
-# define TsanIgnoreWritesBegin()
-# define TsanIgnoreWritesEnd()
+#define TsanHappensBefore(cv)
+#define TsanHappensAfter(cv)
+#define TsanIgnoreWritesBegin()
+#define TsanIgnoreWritesEnd()
 #endif
 
 /// \macro LLVM_NO_SANITIZE