Move Partition Allocator into Chromium base.

base/sys_byteorder.h

 // Copyright (c) 2012 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.
 
 // This header defines cross-platform ByteSwap() implementations for 16, 32 and
 // 64-bit values, and NetToHostXX() / HostToNextXX() functions equivalent to
 // the traditional ntohX() and htonX() functions.
 // Use the functions defined here rather than using the platform-specific
 // functions directly.
 
@@ skipping 28 matching lines @@
 }
 
 inline uint64_t ByteSwap(uint64_t x) {
 #if defined(COMPILER_MSVC)
   return _byteswap_uint64(x);
 #else
   return __builtin_bswap64(x);
 #endif
 }
 
+inline uintptr_t ByteSwapUintPtrT(uintptr_t x) {
+#if defined(ARCH_CPU_64_BITS)
+  static_assert(sizeof(uint64_t) == sizeof(uintptr_t),
+                "uintptr_t not the same as uint64_t");
+  return ByteSwap(static_cast<uint64_t>(x));
+#elif defined(ARCH_CPU_32_BITS)
+  static_assert(sizeof(uint32_t) == sizeof(uintptr_t),
+                "uintptr_t not the same as uinti32_t");

[gab, 2016/12/09 21:01:56]

nit: typo s/uinti32_t/uint32_t/

+  return ByteSwap(static_cast<uint32_t>(x));
+#else
+#error architecture not supported
+#endif
+}
+
 // Converts the bytes in |x| from host order (endianness) to little endian, and
 // returns the result.
 inline uint16_t ByteSwapToLE16(uint16_t x) {
 #if defined(ARCH_CPU_LITTLE_ENDIAN)
   return x;
 #else
   return ByteSwap(x);
 #endif
 }
 inline uint32_t ByteSwapToLE32(uint32_t x) {
@@ skipping 55 matching lines @@
 #if defined(ARCH_CPU_LITTLE_ENDIAN)
   return ByteSwap(x);
 #else
   return x;
 #endif
 }
 
 }  // namespace base
 
 #endif  // BASE_SYS_BYTEORDER_H_