Add uint128_struct and its test.

This will be used in the upcoming Minidump context structures.

This also updates mini_chromium to ba9b15f1b6a7 to pick up:

ba9b15f1b6a7 Make bit_cast available in C++11 mode.

R=rsesek@chromium.org

Review URL: https://codereview.chromium.org/583283003

DEPS

@@ -28,7 +28,7 @@ deps = {
       '46282cedf40ff7fe803be4af357b9d59050f02e4',  # svn r1977
   'crashpad/third_party/mini_chromium/mini_chromium':
       Var('chromium_git') + '/chromium/mini_chromium@' +
-      '313bd83d6d9dc276bd48743fddc0295fc08f9478',
+      'ba9b15f1b6a7616ac0cb26069201a479e81845c3',
 }
 
 hooks = [

util/numeric/int128.h

@@ -0,0 +1,50 @@
+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_UTIL_NUMERIC_INT128_H_
+#define CRASHPAD_UTIL_NUMERIC_INT128_H_
+
+#include <stdint.h>
+
+#include "build/build_config.h"
+
+namespace crashpad {
+
+//! \brief Stores a 128-bit quantity.
+//!
+//! This structure is organized so that 128-bit quantities are laid out in
+//! memory according to the system’s natural byte order. If a system offers a
+//! native 128-bit type, it should be possible to bit_cast<> between that type
+//! and this one.
+//!
+//! This structure is designed to have the same layout, although not the same
+//! field names, as the Windows SDK’s `M128A` type from `<winnt.h>`. It is
+//! provided here instead of in `compat` because it is useful outside of the
+//! scope of data structures defined by the Windows SDK.
+struct uint128_struct {
+#if defined(ARCH_CPU_LITTLE_ENDIAN) || DOXYGEN
+  //! \brief The low 64 bits of the 128-bit quantity.
+  uint64_t lo;
+
+  //! \brief The high 64 bits of the 128-bit quantity.
+  uint64_t hi;
+#else
+  uint64_t hi;
+  uint64_t lo;
+#endif
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_UTIL_NUMERIC_INT128_H_

util/numeric/int128_test.cc

@@ -0,0 +1,42 @@
+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "util/numeric/int128.h"
+
+#include "base/basictypes.h"
+#include "gtest/gtest.h"
+
+namespace {
+
+using namespace crashpad;
+
+TEST(Int128, UInt128) {
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+  const uint8_t kBytes[] =
+      {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
+#else
+  const uint8_t kBytes[] =
+      {15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0};
+#endif
+
+  uint128_struct uint128;
+  COMPILE_ASSERT(sizeof(uint128) == sizeof(kBytes), sizes_must_be_equal);
+
+  uint128 = bit_cast<uint128_struct>(kBytes);
+
+  EXPECT_EQ(0x0706050403020100u, uint128.lo);
+  EXPECT_EQ(0x0f0e0d0c0b0a0908u, uint128.hi);
+}
+
+}  // namespace

util/util.gyp

@@ -92,6 +92,7 @@
         'misc/uuid.h',
         'numeric/checked_range.h',
         'numeric/in_range_cast.h',
+        'numeric/int128.h',
         'numeric/safe_assignment.h',
         'posix/process_util.h',
         'posix/process_util_mac.cc',
@@ -219,6 +220,7 @@
         'misc/uuid_test.cc',
         'numeric/checked_range_test.cc',
         'numeric/in_range_cast_test.cc',
+        'numeric/int128_test.cc',
         'posix/process_util_test.cc',
         'posix/symbolic_constants_posix_test.cc',
         'stdlib/string_number_conversion_test.cc',