Export of internal Abseil changes.

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60bc1e62580e0ff352a92c785f29550c2000447d by Xiaoyi Zhang <zhangxy@google.com>:

Import Github PR #143.

absl/synchronization/internal/kernel_timeout.h uses INFINITE macro that comes from windows.h that is included by winsock2.h that is included by absl/time/time.h. This internal header will be included by public header. It should not depend on windows.h.

PiperOrigin-RevId: 205109009

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1617f0a333a8030e4e4c0bc1eef71f4a5fe9874d by Abseil Team <absl-team@google.com>:

Internal change

PiperOrigin-RevId: 205101804

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8dce298b8c96c12c423943a366a4d92a554366c4 by Chris Kennelly <ckennelly@google.com>:

Define UNALIGNED_LOAD/STORE macros for UNDEFINED_BEHAVIOR_SANITIZER.

When using UBSan in trap mode (that is, without the ubsan runtime library), the
x86 macros can cause alignment errors as they assume unaligned loads/stores are
permitted.  The macros defined in the presence of
{ADDRESS,THREAD,MEMORY}_SANITIZER require the runtime library.

PiperOrigin-RevId: 205096794
GitOrigin-RevId: 60bc1e62580e0ff352a92c785f29550c2000447d
Change-Id: I65a6cc86a711796c9d3a605310d67795b9f76ce9

absl/base/internal/unaligned_access.h

@@ -96,6 +96,47 @@ inline void UnalignedStore64(void *p, uint64_t v) {
 #define ABSL_INTERNAL_UNALIGNED_LOAD32(_p) (absl::UnalignedLoad32(_p))
 #define ABSL_INTERNAL_UNALIGNED_LOAD64(_p) (absl::UnalignedLoad64(_p))
 
+#define ABSL_INTERNAL_UNALIGNED_STORE16(_p, _val) \
+  (absl::UnalignedStore16(_p, _val))
+#define ABSL_INTERNAL_UNALIGNED_STORE32(_p, _val) \
+  (absl::UnalignedStore32(_p, _val))
+#define ABSL_INTERNAL_UNALIGNED_STORE64(_p, _val) \
+  (absl::UnalignedStore64(_p, _val))
+
+#elif defined(UNDEFINED_BEHAVIOR_SANITIZER)
+
+namespace absl {
+
+inline uint16_t UnalignedLoad16(const void *p) {
+  uint16_t t;
+  memcpy(&t, p, sizeof t);
+  return t;
+}
+
+inline uint32_t UnalignedLoad32(const void *p) {
+  uint32_t t;
+  memcpy(&t, p, sizeof t);
+  return t;
+}
+
+inline uint64_t UnalignedLoad64(const void *p) {
+  uint64_t t;
+  memcpy(&t, p, sizeof t);
+  return t;
+}
+
+inline void UnalignedStore16(void *p, uint16_t v) { memcpy(p, &v, sizeof v); }
+
+inline void UnalignedStore32(void *p, uint32_t v) { memcpy(p, &v, sizeof v); }
+
+inline void UnalignedStore64(void *p, uint64_t v) { memcpy(p, &v, sizeof v); }
+
+}  // namespace absl
+
+#define ABSL_INTERNAL_UNALIGNED_LOAD16(_p) (absl::UnalignedLoad16(_p))
+#define ABSL_INTERNAL_UNALIGNED_LOAD32(_p) (absl::UnalignedLoad32(_p))
+#define ABSL_INTERNAL_UNALIGNED_LOAD64(_p) (absl::UnalignedLoad64(_p))
+
 #define ABSL_INTERNAL_UNALIGNED_STORE16(_p, _val) \
   (absl::UnalignedStore16(_p, _val))
 #define ABSL_INTERNAL_UNALIGNED_STORE32(_p, _val) \

absl/numeric/int128.h

@@ -31,6 +31,7 @@
 #include <cstring>
 #include <iosfwd>
 #include <limits>
+#include <utility>
 
 #include "absl/base/config.h"
 #include "absl/base/macros.h"

absl/synchronization/internal/kernel_timeout.h

@@ -117,7 +117,7 @@ class KernelTimeout {
   // This header file may be included transitively by public header files,
   // so we define our own DWORD and INFINITE instead of getting them from
   // <intsafe.h> and <WinBase.h>.
-  typedef unsigned long DWord;
+  typedef unsigned long DWord;  // NOLINT
   DWord InMillisecondsFromNow() const {
     constexpr DWord kInfinite = std::numeric_limits<DWord>::max();
     if (!has_timeout()) {