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.
 
 #ifndef BASE_SYS_BYTEORDER_H_
 #define BASE_SYS_BYTEORDER_H_
 
 #include <stdint.h>
 
+#include "base/logging.h"
 #include "build/build_config.h"
 
 #if defined(COMPILER_MSVC)
 #include <stdlib.h>
 #endif
 
 namespace base {
 
 // Returns a value with all bytes in |x| swapped, i.e. reverses the endianness.
 inline uint16_t ByteSwap(uint16_t x) {
@@ skipping 13 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) {
+  // We do it this way because some build configurations are ILP32 even when
+  // defined(ARCH_CPU_64_BITS). Unfortunately, we can't use sizeof in #ifs. But,
+  // because these conditionals are constexprs, the irrelevant branches will
+  // likely be optimized away, so this construction should not result in code
+  // bloat.
+  if (sizeof(uintptr_t) == 4) {
+    return ByteSwap(static_cast<uint32_t>(x));
+  } else if (sizeof(uintptr_t) == 8) {
+    return ByteSwap(static_cast<uint64_t>(x));
+  } else {
+    NOTREACHED();
+  }
+}
+
 // 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_