Added Lexer::getBufferEnd().

Summary:
There's Lexer::getBufferStart(), and we need getBufferEnd() to access
the whole input buffer in clang::format::reformat. We don't want to
rely on the fact that the Lexer::BufferEnd always points to '\0', as there can
be embedded '\0's as well.

Reviewers: jordan_rose

Reviewed By: jordan_rose

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D916

llvm-svn: 183236

clang/include/clang/Lex/Lexer.h

@@ -202,7 +202,10 @@ public:
   /// lexer has nothing to reset to.
   void resetExtendedTokenMode();
 
-  const char *getBufferStart() const { return BufferStart; }
+  /// Gets source code buffer.
+  StringRef getBuffer() const {
+    return StringRef(BufferStart, BufferEnd - BufferStart);
+  }
 
   /// ReadToEndOfLine - Read the rest of the current preprocessor line as an
   /// uninterpreted string.  This switches the lexer out of directive mode.

clang/lib/Rewrite/Core/HTMLRewrite.cpp

@@ -361,7 +361,7 @@ void html::SyntaxHighlight(Rewriter &R, FileID FID, const Preprocessor &PP) {
   const SourceManager &SM = PP.getSourceManager();
   const llvm::MemoryBuffer *FromFile = SM.getBuffer(FID);
   Lexer L(FID, FromFile, SM, PP.getLangOpts());
-  const char *BufferStart = L.getBufferStart();
+  const char *BufferStart = L.getBuffer().data();
 
   // Inform the preprocessor that we want to retain comments as tokens, so we
   // can highlight them.