libtsan: Update to LLVM 20.

Author: alexrp

lib/tsan/builtins/assembly.h

@@ -290,4 +290,16 @@
   CFI_END
 #endif
 
+#ifdef __arm__
+#include "int_endianness.h"
+
+#if _YUGA_BIG_ENDIAN
+#define VMOV_TO_DOUBLE(dst, src0, src1) vmov dst, src1, src0 SEPARATOR
+#define VMOV_FROM_DOUBLE(dst0, dst1, src) vmov dst1, dst0, src SEPARATOR
+#else
+#define VMOV_TO_DOUBLE(dst, src0, src1) vmov dst, src0, src1 SEPARATOR
+#define VMOV_FROM_DOUBLE(dst0, dst1, src) vmov dst0, dst1, src SEPARATOR
+#endif
+#endif
+
 #endif // COMPILERRT_ASSEMBLY_H

lib/tsan/interception/interception.h

@@ -25,8 +25,19 @@
 
 // These typedefs should be used only in the interceptor definitions to replace
 // the standard system types (e.g. SSIZE_T instead of ssize_t)
-typedef __sanitizer::uptr    SIZE_T;
-typedef __sanitizer::sptr    SSIZE_T;
+// On Windows the system headers (basetsd.h) provide a conflicting definition
+// of SIZE_T/SSIZE_T that do not match the real size_t/ssize_t for 32-bit
+// systems (using long instead of the expected int). Work around the typedef
+// redefinition by #defining SIZE_T instead of using a typedef.
+// TODO: We should be using __sanitizer::usize (and a new ssize) instead of
+// these new macros as long as we ensure they match the real system definitions.
+#if SANITIZER_WINDOWS
+// Ensure that (S)SIZE_T were already defined as we are about to override them.
+#  include <basetsd.h>
+#endif
+
+#define SIZE_T __sanitizer::usize
+#define SSIZE_T __sanitizer::ssize
 typedef __sanitizer::sptr    PTRDIFF_T;
 typedef __sanitizer::s64     INTMAX_T;
 typedef __sanitizer::u64     UINTMAX_T;
@@ -338,16 +349,8 @@ const interpose_substitution substitution_##func_name[]             \
 #endif
 
 // ISO C++ forbids casting between pointer-to-function and pointer-to-object,
-// so we use casting via an integral type __interception::uptr,
-// assuming that system is POSIX-compliant. Using other hacks seem
-// challenging, as we don't even pass function type to
-// INTERCEPT_FUNCTION macro, only its name.
+// so we use casts via uintptr_t (the local __sanitizer::uptr equivalent).
 namespace __interception {
-#if defined(_WIN64)
-typedef unsigned long long uptr;
-#else
-typedef unsigned long uptr;
-#endif  // _WIN64
 
 #if defined(__ELF__) && !SANITIZER_FUCHSIA
 // The use of interceptors makes many sanitizers unusable for static linking.

lib/tsan/interception/interception_type_test.cpp

@@ -12,28 +12,35 @@
 //===----------------------------------------------------------------------===//
 
 #include "interception.h"
+#include "sanitizer_common/sanitizer_type_traits.h"
 
-#if SANITIZER_LINUX || SANITIZER_APPLE
-
-#include <sys/types.h>
+#if __has_include(<sys/types.h>)
+#  include <sys/types.h>
+#endif
 #include <stddef.h>
 #include <stdint.h>
 
-COMPILER_CHECK(sizeof(::SIZE_T) == sizeof(size_t));
-COMPILER_CHECK(sizeof(::SSIZE_T) == sizeof(ssize_t));
-COMPILER_CHECK(sizeof(::PTRDIFF_T) == sizeof(ptrdiff_t));
+COMPILER_CHECK((__sanitizer::is_same<__sanitizer::uptr, ::uintptr_t>::value));
+COMPILER_CHECK((__sanitizer::is_same<__sanitizer::sptr, ::intptr_t>::value));
+COMPILER_CHECK((__sanitizer::is_same<__sanitizer::usize, ::size_t>::value));
+COMPILER_CHECK((__sanitizer::is_same<::PTRDIFF_T, ::ptrdiff_t>::value));
+COMPILER_CHECK((__sanitizer::is_same<::SIZE_T, ::size_t>::value));
+#if !SANITIZER_WINDOWS
+// No ssize_t on Windows.
+COMPILER_CHECK((__sanitizer::is_same<::SSIZE_T, ::ssize_t>::value));
+#endif
+// TODO: These are not actually the same type on Linux (long vs long long)
 COMPILER_CHECK(sizeof(::INTMAX_T) == sizeof(intmax_t));
+COMPILER_CHECK(sizeof(::UINTMAX_T) == sizeof(uintmax_t));
 
-#  if SANITIZER_GLIBC || SANITIZER_ANDROID
+#if SANITIZER_GLIBC || SANITIZER_ANDROID
 COMPILER_CHECK(sizeof(::OFF64_T) == sizeof(off64_t));
-#  endif
+#endif
 
 // The following are the cases when pread (and friends) is used instead of
 // pread64. In those cases we need OFF_T to match off_t. We don't care about the
 // rest (they depend on _FILE_OFFSET_BITS setting when building an application).
-# if SANITIZER_ANDROID || !defined _FILE_OFFSET_BITS || \
-  _FILE_OFFSET_BITS != 64
+#if !SANITIZER_WINDOWS && (SANITIZER_ANDROID || !defined _FILE_OFFSET_BITS || \
+                           _FILE_OFFSET_BITS != 64)
 COMPILER_CHECK(sizeof(::OFF_T) == sizeof(off_t));
-# endif
-
 #endif