--- a/unittests/Support/MemoryBufferTest.cpp	Thu Dec 12 15:22:36 2013 +0900
+++ b/unittests/Support/MemoryBufferTest.cpp	Mon Sep 08 22:06:00 2014 +0900
@@ -14,7 +14,6 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/ADT/OwningPtr.h"
 #include "gtest/gtest.h"
 
 using namespace llvm;
@@ -36,7 +35,7 @@
   /// anew before using MemoryBuffer.
   void testGetOpenFileSlice(bool Reopen);
 
-  typedef OwningPtr<MemoryBuffer> OwningBuffer;
+  typedef std::unique_ptr<MemoryBuffer> OwningBuffer;
 
   std::string data;
 };
@@ -44,15 +43,15 @@
 TEST_F(MemoryBufferTest, get) {
   // Default name and null-terminator flag
   OwningBuffer MB1(MemoryBuffer::getMemBuffer(data));
-  EXPECT_TRUE(0 != MB1.get());
+  EXPECT_TRUE(nullptr != MB1.get());
 
   // RequiresNullTerminator = false
   OwningBuffer MB2(MemoryBuffer::getMemBuffer(data, "one", false));
-  EXPECT_TRUE(0 != MB2.get());
+  EXPECT_TRUE(nullptr != MB2.get());
 
   // RequiresNullTerminator = true
   OwningBuffer MB3(MemoryBuffer::getMemBuffer(data, "two", true));
-  EXPECT_TRUE(0 != MB3.get());
+  EXPECT_TRUE(nullptr != MB3.get());
 
   // verify all 3 buffers point to the same address
   EXPECT_EQ(MB1->getBufferStart(), MB2->getBufferStart());
@@ -78,11 +77,11 @@
   }
   OF.close();
 
-  OwningPtr<MemoryBuffer> MB;
-  error_code EC = MemoryBuffer::getFile(TestPath.c_str(), MB);
+  ErrorOr<OwningBuffer> MB = MemoryBuffer::getFile(TestPath.c_str());
+  std::error_code EC = MB.getError();
   ASSERT_FALSE(EC);
 
-  const char *BufData = MB->getBufferStart();
+  const char *BufData = MB.get()->getBufferStart();
   EXPECT_EQ('f', BufData[4095]);
   EXPECT_EQ('\0', BufData[4096]);
 }
@@ -90,11 +89,11 @@
 TEST_F(MemoryBufferTest, copy) {
   // copy with no name
   OwningBuffer MBC1(MemoryBuffer::getMemBufferCopy(data));
-  EXPECT_TRUE(0 != MBC1.get());
+  EXPECT_TRUE(nullptr != MBC1.get());
 
   // copy with a name
   OwningBuffer MBC2(MemoryBuffer::getMemBufferCopy(data, "copy"));
-  EXPECT_TRUE(0 != MBC2.get());
+  EXPECT_TRUE(nullptr != MBC2.get());
 
   // verify the two copies do not point to the same place
   EXPECT_NE(MBC1->getBufferStart(), MBC2->getBufferStart());
@@ -103,25 +102,25 @@
 TEST_F(MemoryBufferTest, make_new) {
   // 0-sized buffer
   OwningBuffer Zero(MemoryBuffer::getNewUninitMemBuffer(0));
-  EXPECT_TRUE(0 != Zero.get());
+  EXPECT_TRUE(nullptr != Zero.get());
 
   // uninitialized buffer with no name
   OwningBuffer One(MemoryBuffer::getNewUninitMemBuffer(321));
-  EXPECT_TRUE(0 != One.get());
+  EXPECT_TRUE(nullptr != One.get());
 
   // uninitialized buffer with name
   OwningBuffer Two(MemoryBuffer::getNewUninitMemBuffer(123, "bla"));
-  EXPECT_TRUE(0 != Two.get());
+  EXPECT_TRUE(nullptr != Two.get());
 
   // 0-initialized buffer with no name
   OwningBuffer Three(MemoryBuffer::getNewMemBuffer(321, data));
-  EXPECT_TRUE(0 != Three.get());
+  EXPECT_TRUE(nullptr != Three.get());
   for (size_t i = 0; i < 321; ++i)
     EXPECT_EQ(0, Three->getBufferStart()[0]);
 
   // 0-initialized buffer with name
   OwningBuffer Four(MemoryBuffer::getNewMemBuffer(123, "zeros"));
-  EXPECT_TRUE(0 != Four.get());
+  EXPECT_TRUE(nullptr != Four.get());
   for (size_t i = 0; i < 123; ++i)
     EXPECT_EQ(0, Four->getBufferStart()[0]);
 }
@@ -147,14 +146,16 @@
     EXPECT_FALSE(sys::fs::openFileForRead(TestPath.c_str(), TestFD));
   }
 
-  OwningBuffer Buf;
-  error_code EC = MemoryBuffer::getOpenFileSlice(TestFD, TestPath.c_str(), Buf,
-                                                 40000, // Size
-                                                 80000  // Offset
-                                                 );
+  ErrorOr<OwningBuffer> Buf =
+      MemoryBuffer::getOpenFileSlice(TestFD, TestPath.c_str(),
+                                     40000, // Size
+                                     80000  // Offset
+                                     );
+
+  std::error_code EC = Buf.getError();
   EXPECT_FALSE(EC);
 
-  StringRef BufData = Buf->getBuffer();
+  StringRef BufData = Buf.get()->getBuffer();
   EXPECT_EQ(BufData.size(), 40000U);
   EXPECT_EQ(BufData[0], '0');
   EXPECT_EQ(BufData[9], '9');