[compiler-rt] Work around incompatible Windows definitions of (S)SIZE_T

The interceptor types are supposed to match size_t (and the non-Windows
ssize_t) exactly, but on 32-bit Windows `size_t` uses `unsigned int`
whereas `SIZE_T` is `unsigned long`. The current definition results in
`uptr` not matching `uintptr_t` since we otherwise get typedef
redefinition errors. Work around this by using a #define instead of
a typedef when defining SIZE_T.

It would probably be cleaner to stop using these uppercase types, but
that is a rather invasive change and this one is the minimal change to
allow uptr to match uintptr_t on Windows.

To ensure this compiles on Windows, we also remove the interceptor.h
defines of uptr (that do not always match __sanitizer::uptr) and rely
on __sanitizer::uptr instead. The interceptor types most likely predate
those other types so clean up the unnecessary definition while here.

This also reverts commit 18e06e3 and
commit bb27dd8.

Reviewed By: mstorsjo, vitalybuka

Pull Request: #106311

compiler-rt/lib/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::sptr
 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.

compiler-rt/lib/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

compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h

@@ -143,7 +143,7 @@ namespace __sanitizer {
 typedef unsigned long long uptr;
 typedef signed long long sptr;
 #else
-#  if (SANITIZER_WORDSIZE == 64) || SANITIZER_APPLE || SANITIZER_WINDOWS
+#  if (SANITIZER_WORDSIZE == 64) || SANITIZER_APPLE
 typedef unsigned long uptr;
 typedef signed long sptr;
 #  else
@@ -194,16 +194,7 @@ typedef u64  OFF64_T;
 #ifdef __SIZE_TYPE__
 typedef __SIZE_TYPE__ usize;
 #else
-// Since we use this for operator new, usize must match the real size_t, but on
-// 32-bit Windows the definition of uptr does not actually match uintptr_t or
-// size_t because we are working around typedef mismatches for the (S)SIZE_T
-// types used in interception.h.
-// Until the definition of uptr has been fixed we have to special case Win32.
-#  if SANITIZER_WINDOWS && SANITIZER_WORDSIZE == 32
-typedef unsigned int usize;
-#  else
 typedef uptr usize;
-#  endif
 #endif
 
 typedef u64 tid_t;