--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/MC/YAML.cpp	Mon Sep 08 22:06:00 2014 +0900
@@ -0,0 +1,65 @@
+//===- YAML.cpp - YAMLIO utilities for object files -----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines utility classes for handling the YAML representation of
+// object files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/YAML.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cctype>
+
+using namespace llvm;
+
+void yaml::ScalarTraits<yaml::BinaryRef>::output(
+    const yaml::BinaryRef &Val, void *, llvm::raw_ostream &Out) {
+  Val.writeAsHex(Out);
+}
+
+StringRef yaml::ScalarTraits<yaml::BinaryRef>::input(StringRef Scalar, void *,
+                                                     yaml::BinaryRef &Val) {
+  if (Scalar.size() % 2 != 0)
+    return "BinaryRef hex string must contain an even number of nybbles.";
+  // TODO: Can we improve YAMLIO to permit a more accurate diagnostic here?
+  // (e.g. a caret pointing to the offending character).
+  for (unsigned I = 0, N = Scalar.size(); I != N; ++I)
+    if (!isxdigit(Scalar[I]))
+      return "BinaryRef hex string must contain only hex digits.";
+  Val = yaml::BinaryRef(Scalar);
+  return StringRef();
+}
+
+void yaml::BinaryRef::writeAsBinary(raw_ostream &OS) const {
+  if (!DataIsHexString) {
+    OS.write((const char *)Data.data(), Data.size());
+    return;
+  }
+  for (unsigned I = 0, N = Data.size(); I != N; I += 2) {
+    uint8_t Byte;
+    StringRef((const char *)&Data[I],  2).getAsInteger(16, Byte);
+    OS.write(Byte);
+  }
+}
+
+void yaml::BinaryRef::writeAsHex(raw_ostream &OS) const {
+  if (binary_size() == 0)
+    return;
+  if (DataIsHexString) {
+    OS.write((const char *)Data.data(), Data.size());
+    return;
+  }
+  for (ArrayRef<uint8_t>::iterator I = Data.begin(), E = Data.end(); I != E;
+       ++I) {
+    uint8_t Byte = *I;
+    OS << hexdigit(Byte >> 4);
+    OS << hexdigit(Byte & 0xf);
+  }
+}