diff --git a/clang/Driver/HTMLDiagnostics.cpp b/clang/Driver/HTMLDiagnostics.cpp
new file mode 100644
index 0000000..5e4ba97
--- /dev/null
+++ b/clang/Driver/HTMLDiagnostics.cpp
@@ -0,0 +1,245 @@
+//===--- HTMLDiagnostics.cpp - HTML Diagnostics for Paths ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the HTMLDiagnostics object.
+//
+//===----------------------------------------------------------------------===//
+
+#include "HTMLDiagnostics.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/Analysis/PathDiagnostic.h"
+#include "clang/Rewrite/Rewriter.h"
+#include "clang/Rewrite/HTMLRewrite.h"
+#include "clang/Lex/Lexer.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Streams.h"
+#include "llvm/System/Path.h"
+#include <fstream>
+#include <sstream>
+
+using namespace clang;
+
+//===----------------------------------------------------------------------===//
+// Boilerplate.
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+class VISIBILITY_HIDDEN HTMLDiagnostics : public PathDiagnosticClient {
+  llvm::sys::Path Directory, FilePrefix;
+  bool createdDir, noDir;
+public:
+  HTMLDiagnostics(const std::string& prefix);
+
+  virtual ~HTMLDiagnostics() {}
+  
+  virtual void HandlePathDiagnostic(const PathDiagnostic& D);
+  
+  void HandlePiece(Rewriter& R, const PathDiagnosticPiece& P, unsigned num);
+  void HighlightRange(Rewriter& R, SourceRange Range, unsigned MainFileID);
+};
+  
+} // end anonymous namespace
+
+HTMLDiagnostics::HTMLDiagnostics(const std::string& prefix)
+  : Directory(prefix), FilePrefix(prefix), createdDir(false), noDir(false) {
+  
+  // All html files begin with "report" 
+  FilePrefix.appendComponent("report");
+}
+
+PathDiagnosticClient*
+clang::CreateHTMLDiagnosticClient(const std::string& prefix) {
+  
+  return new HTMLDiagnostics(prefix);
+}
+
+//===----------------------------------------------------------------------===//
+// Report processing.
+//===----------------------------------------------------------------------===//
+
+void HTMLDiagnostics::HandlePathDiagnostic(const PathDiagnostic& D) {
+
+  if (D.empty())
+    return;
+  
+  // Create the HTML directory if it is missing.
+  
+  if (!createdDir) {
+    createdDir = true;
+    Directory.createDirectoryOnDisk(true, NULL);
+  
+    if (!Directory.isDirectory()) {
+      llvm::cerr << "warning: could not create directory '"
+                  << FilePrefix.toString() << "'\n";
+      
+      noDir = true;
+      
+      return;
+    }
+  }
+  
+  if (noDir)
+    return;
+  
+  // Create a new rewriter to generate HTML.
+  SourceManager& SMgr = D.begin()->getLocation().getManager();
+  Rewriter R(SMgr);
+  
+  // Process the path.
+  
+  unsigned n = D.size();
+  
+  for (PathDiagnostic::const_reverse_iterator I=D.rbegin(), E=D.rend();
+        I!=E; ++I, --n) {
+    
+    HandlePiece(R, *I, n);
+  }
+  
+  // Add line numbers, header, footer, etc.
+  unsigned FileID = R.getSourceMgr().getMainFileID();
+  html::EscapeText(R, FileID);
+  html::AddLineNumbers(R, FileID);
+  
+  // FIXME: Add the number of the file here.
+
+  // Add CSS, header, and footer.
+  
+  html::AddHeaderFooterInternalBuiltinCSS(R, FileID);
+  
+  // Get the rewrite buffer.
+  const RewriteBuffer *Buf = R.getRewriteBufferFor(FileID);
+  
+  if (!Buf) {
+    llvm::cerr << "warning: no diagnostics generated for main file.\n";
+    return;
+  }
+
+  // Create the stream to write out the HTML.
+  std::ofstream os;
+  
+  {
+    // Create a path for the target HTML file.
+    llvm::sys::Path F(FilePrefix);
+    F.makeUnique(false, NULL);
+  
+    // Rename the file with an HTML extension.
+    llvm::sys::Path H(F);
+    H.appendSuffix("html");
+    F.renamePathOnDisk(H, NULL);
+    
+    os.open(H.toString().c_str());
+    
+    if (!os) {
+      llvm::cerr << "warning: could not create file '" << F.toString() << "'\n";
+      return;
+    }
+  }
+  
+  // Emit the HTML to disk.
+
+  for (RewriteBuffer::iterator I = Buf->begin(), E = Buf->end(); I!=E; ++I)
+    os << *I;  
+}
+
+void HTMLDiagnostics::HandlePiece(Rewriter& R,
+                                  const PathDiagnosticPiece& P,
+                                  unsigned num) {
+  
+  // For now, just draw a box above the line in question, and emit the
+  // warning.
+  
+  FullSourceLoc Pos = P.getLocation();
+  
+  if (!Pos.isValid())
+    return;  
+  
+  SourceManager& SM = R.getSourceMgr();
+  FullSourceLoc LPos = Pos.getLogicalLoc();
+  unsigned FileID = LPos.getLocation().getFileID();
+  
+  assert (&LPos.getManager() == &SM && "SourceManagers are different!");
+  
+  unsigned MainFileID = SM.getMainFileID();
+  
+  if (FileID != MainFileID)
+    return;
+  
+  // Compute the column number.  Rewind from the current position to the start
+  // of the line.
+  
+  unsigned ColNo = LPos.getColumnNumber();
+  const char *TokLogicalPtr = LPos.getCharacterData();
+  const char *LineStart = TokLogicalPtr-ColNo;
+  
+  // Create the html for the message.
+  
+  std::ostringstream os;
+  
+  os << "\n<tr><td class=\"num\"></td><td class=\"line\">"
+     << "<div class=\"msg\" style=\"margin-left:"
+     << ColNo << "ex\">";
+  
+  os << P.getString() << "</div></td></tr>";
+  
+  // Insert the new html.
+  
+  const llvm::MemoryBuffer *Buf = SM.getBuffer(FileID);
+  const char* FileStart = Buf->getBufferStart();
+  
+  R.InsertStrBefore(SourceLocation::getFileLoc(FileID, LineStart - FileStart),
+                    os.str());
+  
+  // Now highlight the ranges.
+  
+  for (const SourceRange *I = P.ranges_begin(), *E = P.ranges_end();
+        I != E; ++I)
+    HighlightRange(R, *I, MainFileID);
+}
+
+void HTMLDiagnostics::HighlightRange(Rewriter& R, SourceRange Range,
+                                     unsigned MainFileID) {
+  
+  SourceManager& SourceMgr = R.getSourceMgr();
+  
+  SourceLocation LogicalStart = SourceMgr.getLogicalLoc(Range.getBegin());
+  unsigned StartLineNo = SourceMgr.getLineNumber(LogicalStart);
+  
+  SourceLocation LogicalEnd = SourceMgr.getLogicalLoc(Range.getEnd());
+  unsigned EndLineNo = SourceMgr.getLineNumber(LogicalEnd);
+  
+  if (EndLineNo < StartLineNo)
+    return;
+  
+  if (LogicalStart.getFileID() != MainFileID ||
+      LogicalEnd.getFileID() != MainFileID)
+    return;
+    
+  // Compute the column number of the end.
+  unsigned EndColNo = SourceMgr.getColumnNumber(LogicalEnd);
+  unsigned OldEndColNo = EndColNo;
+
+  if (EndColNo) {
+    // Add in the length of the token, so that we cover multi-char tokens.
+    EndColNo += Lexer::MeasureTokenLength(Range.getEnd(), SourceMgr);
+  }
+  
+  // Highlight the range.  Make the span tag the outermost tag for the
+  // selected range.
+  
+  SourceLocation E =
+    LogicalEnd.getFileLocWithOffset(OldEndColNo > EndColNo
+                                    ? -(OldEndColNo - EndColNo)
+                                    : EndColNo - OldEndColNo);
+  
+  R.InsertCStrBefore(LogicalStart, "<span class=\"mrange\">");
+  R.InsertCStrAfter(E, "</span>");
+}