Add ALIGNAS and ALIGNOF macros to ensure proper alignment of StaticMemorySingletonTraits

base/memory/aligned_memory_unittest.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/memory/aligned_memory.h"
+#include "base/memory/scoped_ptr.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#define EXPECT_ALIGNED(ptr, align) \
+    EXPECT_EQ(0u, reinterpret_cast<uintptr_t>(ptr) & (align - 1))
+
+namespace {
+
+using base::AlignedMemory;
+
+TEST(AlignedMemoryTest, StaticAlignment) {
+  static AlignedMemory<8, 8> raw8;
+  static AlignedMemory<8, 16> raw16;
+  static AlignedMemory<8, 256> raw256;
+  static AlignedMemory<8, 4096> raw4096;
+
+  EXPECT_EQ(8u, ALIGNOF(raw8));
+  EXPECT_EQ(16u, ALIGNOF(raw16));
+  EXPECT_EQ(256u, ALIGNOF(raw256));
+  EXPECT_EQ(4096u, ALIGNOF(raw4096));
+
+  EXPECT_ALIGNED(raw8.void_data(), 8);
+  EXPECT_ALIGNED(raw16.void_data(), 16);
+  EXPECT_ALIGNED(raw256.void_data(), 256);
+  EXPECT_ALIGNED(raw4096.void_data(), 4096);
+}
+
+TEST(AlignedMemoryTest, StackAlignment) {
+  AlignedMemory<8, 8> raw8;
+  AlignedMemory<8, 16> raw16;
+  AlignedMemory<8, 256> raw256;
+  AlignedMemory<8, 4096> raw4096;
+
+  EXPECT_EQ(8u, ALIGNOF(raw8));
+  EXPECT_EQ(16u, ALIGNOF(raw16));
+  EXPECT_EQ(256u, ALIGNOF(raw256));
+  EXPECT_EQ(4096u, ALIGNOF(raw4096));
+
+  EXPECT_ALIGNED(raw8.void_data(), 8);
+  EXPECT_ALIGNED(raw16.void_data(), 16);
+  EXPECT_ALIGNED(raw256.void_data(), 256);
+  EXPECT_ALIGNED(raw4096.void_data(), 4096);
+}
+
+}  // namespace