1 files changed, 7 insertions, 3 deletions
diff --git a/lib/Lex/Lexer.cpp b/lib/Lex/Lexer.cpp
index 3207062..6cdb96f 100644
--- a/lib/Lex/Lexer.cpp
+++ b/lib/Lex/Lexer.cpp
@@ -229,14 +229,18 @@ unsigned Lexer::MeasureTokenLength(SourceLocation Loc,
   // the token this macro expanded to.
   Loc = SM.getInstantiationLoc(Loc);
   std::pair<FileID, unsigned> LocInfo = SM.getDecomposedLoc(Loc);
-  std::pair<const char *,const char *> Buffer = SM.getBufferData(LocInfo.first);
-  const char *StrData = Buffer.first+LocInfo.second;
+  bool Invalid = false;
+  llvm::StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid);
+  if (Invalid)
+    return 0;
+
+  const char *StrData = Buffer.data()+LocInfo.second;
 
   if (isWhitespace(StrData[0]))
     return 0;
 
   // Create a lexer starting at the beginning of this token.
-  Lexer TheLexer(Loc, LangOpts, Buffer.first, StrData, Buffer.second);
+  Lexer TheLexer(Loc, LangOpts, Buffer.begin(), StrData, Buffer.end());
   TheLexer.SetCommentRetentionState(true);
   Token TheTok;
   TheLexer.LexFromRawLexer(TheTok);