11 files changed, 8937 insertions, 0 deletions
diff --git a/contrib/llvm/tools/clang/lib/Rewrite/DeltaTree.cpp b/contrib/llvm/tools/clang/lib/Rewrite/DeltaTree.cpp
new file mode 100644
index 0000000..085dfd8
--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/Rewrite/DeltaTree.cpp
@@ -0,0 +1,469 @@
+//===--- DeltaTree.cpp - B-Tree for Rewrite Delta tracking ----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the DeltaTree and related classes.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/DeltaTree.h"
+#include "llvm/Support/Casting.h"
+#include <cstring>
+#include <cstdio>
+using namespace clang;
+using llvm::cast;
+using llvm::dyn_cast;
+
+/// The DeltaTree class is a multiway search tree (BTree) structure with some
+/// fancy features.  B-Trees are generally more memory and cache efficient
+/// than binary trees, because they store multiple keys/values in each node.
+///
+/// DeltaTree implements a key/value mapping from FileIndex to Delta, allowing
+/// fast lookup by FileIndex.  However, an added (important) bonus is that it
+/// can also efficiently tell us the full accumulated delta for a specific
+/// file offset as well, without traversing the whole tree.
+///
+/// The nodes of the tree are made up of instances of two classes:
+/// DeltaTreeNode and DeltaTreeInteriorNode.  The later subclasses the
+/// former and adds children pointers.  Each node knows the full delta of all
+/// entries (recursively) contained inside of it, which allows us to get the
+/// full delta implied by a whole subtree in constant time.
+
+namespace {
+  /// SourceDelta - As code in the original input buffer is added and deleted,
+  /// SourceDelta records are used to keep track of how the input SourceLocation
+  /// object is mapped into the output buffer.
+  struct SourceDelta {
+    unsigned FileLoc;
+    int Delta;
+
+    static SourceDelta get(unsigned Loc, int D) {
+      SourceDelta Delta;
+      Delta.FileLoc = Loc;
+      Delta.Delta = D;
+      return Delta;
+    }
+  };
+  
+  /// DeltaTreeNode - The common part of all nodes.
+  ///
+  class DeltaTreeNode {
+  public:
+    struct InsertResult {
+      DeltaTreeNode *LHS, *RHS;
+      SourceDelta Split;
+    };
+    
+  private:
+    friend class DeltaTreeInteriorNode;
+
+    /// WidthFactor - This controls the number of K/V slots held in the BTree:
+    /// how wide it is.  Each level of the BTree is guaranteed to have at least
+    /// WidthFactor-1 K/V pairs (except the root) and may have at most
+    /// 2*WidthFactor-1 K/V pairs.
+    enum { WidthFactor = 8 };
+
+    /// Values - This tracks the SourceDelta's currently in this node.
+    ///
+    SourceDelta Values[2*WidthFactor-1];
+
+    /// NumValuesUsed - This tracks the number of values this node currently
+    /// holds.
+    unsigned char NumValuesUsed;
+
+    /// IsLeaf - This is true if this is a leaf of the btree.  If false, this is
+    /// an interior node, and is actually an instance of DeltaTreeInteriorNode.
+    bool IsLeaf;
+
+    /// FullDelta - This is the full delta of all the values in this node and
+    /// all children nodes.
+    int FullDelta;
+  public:
+    DeltaTreeNode(bool isLeaf = true)
+      : NumValuesUsed(0), IsLeaf(isLeaf), FullDelta(0) {}
+
+    bool isLeaf() const { return IsLeaf; }
+    int getFullDelta() const { return FullDelta; }
+    bool isFull() const { return NumValuesUsed == 2*WidthFactor-1; }
+
+    unsigned getNumValuesUsed() const { return NumValuesUsed; }
+    const SourceDelta &getValue(unsigned i) const {
+      assert(i < NumValuesUsed && "Invalid value #");
+      return Values[i];
+    }
+    SourceDelta &getValue(unsigned i) {
+      assert(i < NumValuesUsed && "Invalid value #");
+      return Values[i];
+    }
+
+    /// DoInsertion - Do an insertion of the specified FileIndex/Delta pair into
+    /// this node.  If insertion is easy, do it and return false.  Otherwise,
+    /// split the node, populate InsertRes with info about the split, and return
+    /// true.
+    bool DoInsertion(unsigned FileIndex, int Delta, InsertResult *InsertRes);
+
+    void DoSplit(InsertResult &InsertRes);
+
+
+    /// RecomputeFullDeltaLocally - Recompute the FullDelta field by doing a
+    /// local walk over our contained deltas.
+    void RecomputeFullDeltaLocally();
+
+    void Destroy();
+
+    //static inline bool classof(const DeltaTreeNode *) { return true; }
+  };
+} // end anonymous namespace
+
+namespace {
+  /// DeltaTreeInteriorNode - When isLeaf = false, a node has child pointers.
+  /// This class tracks them.
+  class DeltaTreeInteriorNode : public DeltaTreeNode {
+    DeltaTreeNode *Children[2*WidthFactor];
+    ~DeltaTreeInteriorNode() {
+      for (unsigned i = 0, e = NumValuesUsed+1; i != e; ++i)
+        Children[i]->Destroy();
+    }
+    friend class DeltaTreeNode;
+  public:
+    DeltaTreeInteriorNode() : DeltaTreeNode(false /*nonleaf*/) {}
+
+    DeltaTreeInteriorNode(const InsertResult &IR)
+      : DeltaTreeNode(false /*nonleaf*/) {
+      Children[0] = IR.LHS;
+      Children[1] = IR.RHS;
+      Values[0] = IR.Split;
+      FullDelta = IR.LHS->getFullDelta()+IR.RHS->getFullDelta()+IR.Split.Delta;
+      NumValuesUsed = 1;
+    }
+
+    const DeltaTreeNode *getChild(unsigned i) const {
+      assert(i < getNumValuesUsed()+1 && "Invalid child");
+      return Children[i];
+    }
+    DeltaTreeNode *getChild(unsigned i) {
+      assert(i < getNumValuesUsed()+1 && "Invalid child");
+      return Children[i];
+    }
+
+  //static inline bool classof(const DeltaTreeInteriorNode *) { return true; }
+    static inline bool classof(const DeltaTreeNode *N) { return !N->isLeaf(); }
+  };
+}
+
+
+/// Destroy - A 'virtual' destructor.
+void DeltaTreeNode::Destroy() {
+  if (isLeaf())
+    delete this;
+  else
+    delete cast<DeltaTreeInteriorNode>(this);
+}
+
+/// RecomputeFullDeltaLocally - Recompute the FullDelta field by doing a
+/// local walk over our contained deltas.
+void DeltaTreeNode::RecomputeFullDeltaLocally() {
+  int NewFullDelta = 0;
+  for (unsigned i = 0, e = getNumValuesUsed(); i != e; ++i)
+    NewFullDelta += Values[i].Delta;
+  if (DeltaTreeInteriorNode *IN = dyn_cast<DeltaTreeInteriorNode>(this))
+    for (unsigned i = 0, e = getNumValuesUsed()+1; i != e; ++i)
+      NewFullDelta += IN->getChild(i)->getFullDelta();
+  FullDelta = NewFullDelta;
+}
+
+/// DoInsertion - Do an insertion of the specified FileIndex/Delta pair into
+/// this node.  If insertion is easy, do it and return false.  Otherwise,
+/// split the node, populate InsertRes with info about the split, and return
+/// true.
+bool DeltaTreeNode::DoInsertion(unsigned FileIndex, int Delta,
+                                InsertResult *InsertRes) {
+  // Maintain full delta for this node.
+  FullDelta += Delta;
+
+  // Find the insertion point, the first delta whose index is >= FileIndex.
+  unsigned i = 0, e = getNumValuesUsed();
+  while (i != e && FileIndex > getValue(i).FileLoc)
+    ++i;
+
+  // If we found an a record for exactly this file index, just merge this
+  // value into the pre-existing record and finish early.
+  if (i != e && getValue(i).FileLoc == FileIndex) {
+    // NOTE: Delta could drop to zero here.  This means that the delta entry is
+    // useless and could be removed.  Supporting erases is more complex than
+    // leaving an entry with Delta=0, so we just leave an entry with Delta=0 in
+    // the tree.
+    Values[i].Delta += Delta;
+    return false;
+  }
+
+  // Otherwise, we found an insertion point, and we know that the value at the
+  // specified index is > FileIndex.  Handle the leaf case first.
+  if (isLeaf()) {
+    if (!isFull()) {
+      // For an insertion into a non-full leaf node, just insert the value in
+      // its sorted position.  This requires moving later values over.
+      if (i != e)
+        memmove(&Values[i+1], &Values[i], sizeof(Values[0])*(e-i));
+      Values[i] = SourceDelta::get(FileIndex, Delta);
+      ++NumValuesUsed;
+      return false;
+    }
+
+    // Otherwise, if this is leaf is full, split the node at its median, insert
+    // the value into one of the children, and return the result.
+    assert(InsertRes && "No result location specified");
+    DoSplit(*InsertRes);
+
+    if (InsertRes->Split.FileLoc > FileIndex)
+      InsertRes->LHS->DoInsertion(FileIndex, Delta, 0 /*can't fail*/);
+    else
+      InsertRes->RHS->DoInsertion(FileIndex, Delta, 0 /*can't fail*/);
+    return true;
+  }
+
+  // Otherwise, this is an interior node.  Send the request down the tree.
+  DeltaTreeInteriorNode *IN = cast<DeltaTreeInteriorNode>(this);
+  if (!IN->Children[i]->DoInsertion(FileIndex, Delta, InsertRes))
+    return false; // If there was space in the child, just return.
+
+  // Okay, this split the subtree, producing a new value and two children to
+  // insert here.  If this node is non-full, we can just insert it directly.
+  if (!isFull()) {
+    // Now that we have two nodes and a new element, insert the perclated value
+    // into ourself by moving all the later values/children down, then inserting
+    // the new one.
+    if (i != e)
+      memmove(&IN->Children[i+2], &IN->Children[i+1],
+              (e-i)*sizeof(IN->Children[0]));
+    IN->Children[i] = InsertRes->LHS;
+    IN->Children[i+1] = InsertRes->RHS;
+
+    if (e != i)
+      memmove(&Values[i+1], &Values[i], (e-i)*sizeof(Values[0]));
+    Values[i] = InsertRes->Split;
+    ++NumValuesUsed;
+    return false;
+  }
+
+  // Finally, if this interior node was full and a node is percolated up, split
+  // ourself and return that up the chain.  Start by saving all our info to
+  // avoid having the split clobber it.
+  IN->Children[i] = InsertRes->LHS;
+  DeltaTreeNode *SubRHS = InsertRes->RHS;
+  SourceDelta SubSplit = InsertRes->Split;
+
+  // Do the split.
+  DoSplit(*InsertRes);
+
+  // Figure out where to insert SubRHS/NewSplit.
+  DeltaTreeInteriorNode *InsertSide;
+  if (SubSplit.FileLoc < InsertRes->Split.FileLoc)
+    InsertSide = cast<DeltaTreeInteriorNode>(InsertRes->LHS);
+  else
+    InsertSide = cast<DeltaTreeInteriorNode>(InsertRes->RHS);
+
+  // We now have a non-empty interior node 'InsertSide' to insert
+  // SubRHS/SubSplit into.  Find out where to insert SubSplit.
+
+  // Find the insertion point, the first delta whose index is >SubSplit.FileLoc.
+  i = 0; e = InsertSide->getNumValuesUsed();
+  while (i != e && SubSplit.FileLoc > InsertSide->getValue(i).FileLoc)
+    ++i;
+
+  // Now we know that i is the place to insert the split value into.  Insert it
+  // and the child right after it.
+  if (i != e)
+    memmove(&InsertSide->Children[i+2], &InsertSide->Children[i+1],
+            (e-i)*sizeof(IN->Children[0]));
+  InsertSide->Children[i+1] = SubRHS;
+
+  if (e != i)
+    memmove(&InsertSide->Values[i+1], &InsertSide->Values[i],
+            (e-i)*sizeof(Values[0]));
+  InsertSide->Values[i] = SubSplit;
+  ++InsertSide->NumValuesUsed;
+  InsertSide->FullDelta += SubSplit.Delta + SubRHS->getFullDelta();
+  return true;
+}
+
+/// DoSplit - Split the currently full node (which has 2*WidthFactor-1 values)
+/// into two subtrees each with "WidthFactor-1" values and a pivot value.
+/// Return the pieces in InsertRes.
+void DeltaTreeNode::DoSplit(InsertResult &InsertRes) {
+  assert(isFull() && "Why split a non-full node?");
+
+  // Since this node is full, it contains 2*WidthFactor-1 values.  We move
+  // the first 'WidthFactor-1' values to the LHS child (which we leave in this
+  // node), propagate one value up, and move the last 'WidthFactor-1' values
+  // into the RHS child.
+
+  // Create the new child node.
+  DeltaTreeNode *NewNode;
+  if (DeltaTreeInteriorNode *IN = dyn_cast<DeltaTreeInteriorNode>(this)) {
+    // If this is an interior node, also move over 'WidthFactor' children
+    // into the new node.
+    DeltaTreeInteriorNode *New = new DeltaTreeInteriorNode();
+    memcpy(&New->Children[0], &IN->Children[WidthFactor],
+           WidthFactor*sizeof(IN->Children[0]));
+    NewNode = New;
+  } else {
+    // Just create the new leaf node.
+    NewNode = new DeltaTreeNode();
+  }
+
+  // Move over the last 'WidthFactor-1' values from here to NewNode.
+  memcpy(&NewNode->Values[0], &Values[WidthFactor],
+         (WidthFactor-1)*sizeof(Values[0]));
+
+  // Decrease the number of values in the two nodes.
+  NewNode->NumValuesUsed = NumValuesUsed = WidthFactor-1;
+
+  // Recompute the two nodes' full delta.
+  NewNode->RecomputeFullDeltaLocally();
+  RecomputeFullDeltaLocally();
+
+  InsertRes.LHS = this;
+  InsertRes.RHS = NewNode;
+  InsertRes.Split = Values[WidthFactor-1];
+}
+
+
+
+//===----------------------------------------------------------------------===//
+//                        DeltaTree Implementation
+//===----------------------------------------------------------------------===//
+
+//#define VERIFY_TREE
+
+#ifdef VERIFY_TREE
+/// VerifyTree - Walk the btree performing assertions on various properties to
+/// verify consistency.  This is useful for debugging new changes to the tree.
+static void VerifyTree(const DeltaTreeNode *N) {
+  const DeltaTreeInteriorNode *IN = dyn_cast<DeltaTreeInteriorNode>(N);
+  if (IN == 0) {
+    // Verify leaves, just ensure that FullDelta matches up and the elements
+    // are in proper order.
+    int FullDelta = 0;
+    for (unsigned i = 0, e = N->getNumValuesUsed(); i != e; ++i) {
+      if (i)
+        assert(N->getValue(i-1).FileLoc < N->getValue(i).FileLoc);
+      FullDelta += N->getValue(i).Delta;
+    }
+    assert(FullDelta == N->getFullDelta());
+    return;
+  }
+
+  // Verify interior nodes: Ensure that FullDelta matches up and the
+  // elements are in proper order and the children are in proper order.
+  int FullDelta = 0;
+  for (unsigned i = 0, e = IN->getNumValuesUsed(); i != e; ++i) {
+    const SourceDelta &IVal = N->getValue(i);
+    const DeltaTreeNode *IChild = IN->getChild(i);
+    if (i)
+      assert(IN->getValue(i-1).FileLoc < IVal.FileLoc);
+    FullDelta += IVal.Delta;
+    FullDelta += IChild->getFullDelta();
+
+    // The largest value in child #i should be smaller than FileLoc.
+    assert(IChild->getValue(IChild->getNumValuesUsed()-1).FileLoc <
+           IVal.FileLoc);
+
+    // The smallest value in child #i+1 should be larger than FileLoc.
+    assert(IN->getChild(i+1)->getValue(0).FileLoc > IVal.FileLoc);
+    VerifyTree(IChild);
+  }
+
+  FullDelta += IN->getChild(IN->getNumValuesUsed())->getFullDelta();
+
+  assert(FullDelta == N->getFullDelta());
+}
+#endif  // VERIFY_TREE
+
+static DeltaTreeNode *getRoot(void *Root) {
+  return (DeltaTreeNode*)Root;
+}
+
+DeltaTree::DeltaTree() {
+  Root = new DeltaTreeNode();
+}
+DeltaTree::DeltaTree(const DeltaTree &RHS) {
+  // Currently we only support copying when the RHS is empty.
+  assert(getRoot(RHS.Root)->getNumValuesUsed() == 0 &&
+         "Can only copy empty tree");
+  Root = new DeltaTreeNode();
+}
+
+DeltaTree::~DeltaTree() {
+  getRoot(Root)->Destroy();
+}
+
+/// getDeltaAt - Return the accumulated delta at the specified file offset.
+/// This includes all insertions or delections that occurred *before* the
+/// specified file index.
+int DeltaTree::getDeltaAt(unsigned FileIndex) const {
+  const DeltaTreeNode *Node = getRoot(Root);
+
+  int Result = 0;
+
+  // Walk down the tree.
+  while (1) {
+    // For all nodes, include any local deltas before the specified file
+    // index by summing them up directly.  Keep track of how many were
+    // included.
+    unsigned NumValsGreater = 0;
+    for (unsigned e = Node->getNumValuesUsed(); NumValsGreater != e;
+         ++NumValsGreater) {
+      const SourceDelta &Val = Node->getValue(NumValsGreater);
+
+      if (Val.FileLoc >= FileIndex)
+        break;
+      Result += Val.Delta;
+    }
+
+    // If we have an interior node, include information about children and
+    // recurse.  Otherwise, if we have a leaf, we're done.
+    const DeltaTreeInteriorNode *IN = dyn_cast<DeltaTreeInteriorNode>(Node);
+    if (!IN) return Result;
+
+    // Include any children to the left of the values we skipped, all of
+    // their deltas should be included as well.
+    for (unsigned i = 0; i != NumValsGreater; ++i)
+      Result += IN->getChild(i)->getFullDelta();
+
+    // If we found exactly the value we were looking for, break off the
+    // search early.  There is no need to search the RHS of the value for
+    // partial results.
+    if (NumValsGreater != Node->getNumValuesUsed() &&
+        Node->getValue(NumValsGreater).FileLoc == FileIndex)
+      return Result+IN->getChild(NumValsGreater)->getFullDelta();
+
+    // Otherwise, traverse down the tree.  The selected subtree may be
+    // partially included in the range.
+    Node = IN->getChild(NumValsGreater);
+  }
+  // NOT REACHED.
+}
+
+/// AddDelta - When a change is made that shifts around the text buffer,
+/// this method is used to record that info.  It inserts a delta of 'Delta'
+/// into the current DeltaTree at offset FileIndex.
+void DeltaTree::AddDelta(unsigned FileIndex, int Delta) {
+  assert(Delta && "Adding a noop?");
+  DeltaTreeNode *MyRoot = getRoot(Root);
+
+  DeltaTreeNode::InsertResult InsertRes;
+  if (MyRoot->DoInsertion(FileIndex, Delta, &InsertRes)) {
+    Root = MyRoot = new DeltaTreeInteriorNode(InsertRes);
+  }
+
+#ifdef VERIFY_TREE
+  VerifyTree(MyRoot);
+#endif
+}
+
diff --git a/contrib/llvm/tools/clang/lib/Rewrite/FixItRewriter.cpp b/contrib/llvm/tools/clang/lib/Rewrite/FixItRewriter.cpp
new file mode 100644
index 0000000..8dcc5dc
--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/Rewrite/FixItRewriter.cpp
@@ -0,0 +1,159 @@
+//===--- FixItRewriter.cpp - Fix-It Rewriter Diagnostic Client --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This is a diagnostic client adaptor that performs rewrites as
+// suggested by code modification hints attached to diagnostics. It
+// then forwards any diagnostics to the adapted diagnostic client.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/FixItRewriter.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Path.h"
+#include "llvm/ADT/OwningPtr.h"
+#include <cstdio>
+
+using namespace clang;
+
+FixItRewriter::FixItRewriter(Diagnostic &Diags, SourceManager &SourceMgr,
+                             const LangOptions &LangOpts,
+                             FixItOptions *FixItOpts)
+  : Diags(Diags),
+    Rewrite(SourceMgr, LangOpts),
+    FixItOpts(FixItOpts),
+    NumFailures(0) {
+  Client = Diags.takeClient();
+  Diags.setClient(this);
+}
+
+FixItRewriter::~FixItRewriter() {
+  Diags.takeClient();
+  Diags.setClient(Client);
+}
+
+bool FixItRewriter::WriteFixedFile(FileID ID, llvm::raw_ostream &OS) {
+  const RewriteBuffer *RewriteBuf = Rewrite.getRewriteBufferFor(ID);
+  if (!RewriteBuf) return true;
+  RewriteBuf->write(OS);
+  OS.flush();
+  return false;
+}
+
+bool FixItRewriter::WriteFixedFiles() {
+  if (NumFailures > 0 && !FixItOpts->FixWhatYouCan) {
+    Diag(FullSourceLoc(), diag::warn_fixit_no_changes);
+    return true;
+  }
+
+  for (iterator I = buffer_begin(), E = buffer_end(); I != E; ++I) {
+    const FileEntry *Entry = Rewrite.getSourceMgr().getFileEntryForID(I->first);
+    std::string Filename = FixItOpts->RewriteFilename(Entry->getName());
+    std::string Err;
+    llvm::raw_fd_ostream OS(Filename.c_str(), Err,
+                            llvm::raw_fd_ostream::F_Binary);
+    if (!Err.empty()) {
+      Diags.Report(clang::diag::err_fe_unable_to_open_output)
+          << Filename << Err;
+      continue;
+    }
+    RewriteBuffer &RewriteBuf = I->second;
+    RewriteBuf.write(OS);
+    OS.flush();
+  }
+
+  return false;
+}
+
+bool FixItRewriter::IncludeInDiagnosticCounts() const {
+  return Client ? Client->IncludeInDiagnosticCounts() : true;
+}
+
+void FixItRewriter::HandleDiagnostic(Diagnostic::Level DiagLevel,
+                                     const DiagnosticInfo &Info) {
+  // Default implementation (Warnings/errors count).
+  DiagnosticClient::HandleDiagnostic(DiagLevel, Info);
+
+  Client->HandleDiagnostic(DiagLevel, Info);
+
+  // Skip over any diagnostics that are ignored or notes.
+  if (DiagLevel <= Diagnostic::Note)
+    return;
+
+  // Make sure that we can perform all of the modifications we
+  // in this diagnostic.
+  bool CanRewrite = Info.getNumFixItHints() > 0;
+  for (unsigned Idx = 0, Last = Info.getNumFixItHints();
+       Idx < Last; ++Idx) {
+    const FixItHint &Hint = Info.getFixItHint(Idx);
+    if (Hint.RemoveRange.isValid() &&
+        Rewrite.getRangeSize(Hint.RemoveRange) == -1) {
+      CanRewrite = false;
+      break;
+    }
+  }
+
+  if (!CanRewrite) {
+    if (Info.getNumFixItHints() > 0)
+      Diag(Info.getLocation(), diag::note_fixit_in_macro);
+
+    // If this was an error, refuse to perform any rewriting.
+    if (DiagLevel == Diagnostic::Error || DiagLevel == Diagnostic::Fatal) {
+      if (++NumFailures == 1)
+        Diag(Info.getLocation(), diag::note_fixit_unfixed_error);
+    }
+    return;
+  }
+
+  bool Failed = false;
+  for (unsigned Idx = 0, Last = Info.getNumFixItHints();
+       Idx < Last; ++Idx) {
+    const FixItHint &Hint = Info.getFixItHint(Idx);
+
+    if (Hint.CodeToInsert.empty()) {
+      // We're removing code.
+      if (Rewrite.RemoveText(Hint.RemoveRange.getBegin(),
+                             Rewrite.getRangeSize(Hint.RemoveRange)))
+        Failed = true;
+      continue;
+    }
+
+    // We're replacing code.
+    if (Rewrite.ReplaceText(Hint.RemoveRange.getBegin(),
+                            Rewrite.getRangeSize(Hint.RemoveRange),
+                            Hint.CodeToInsert))
+      Failed = true;
+  }
+
+  if (Failed) {
+    ++NumFailures;
+    Diag(Info.getLocation(), diag::note_fixit_failed);
+    return;
+  }
+
+  Diag(Info.getLocation(), diag::note_fixit_applied);
+}
+
+/// \brief Emit a diagnostic via the adapted diagnostic client.
+void FixItRewriter::Diag(SourceLocation Loc, unsigned DiagID) {
+  // When producing this diagnostic, we temporarily bypass ourselves,
+  // clear out any current diagnostic, and let the downstream client
+  // format the diagnostic.
+  Diags.takeClient();
+  Diags.setClient(Client);
+  Diags.Clear();
+  Diags.Report(Loc, DiagID);
+  Diags.takeClient();
+  Diags.setClient(this);
+}
+
+FixItOptions::~FixItOptions() {}
diff --git a/contrib/llvm/tools/clang/lib/Rewrite/FrontendActions.cpp b/contrib/llvm/tools/clang/lib/Rewrite/FrontendActions.cpp
new file mode 100644
index 0000000..33e79ed
--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/Rewrite/FrontendActions.cpp
@@ -0,0 +1,116 @@
+//===--- FrontendActions.cpp ----------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/FrontendActions.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Parse/Parser.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/Utils.h"
+#include "clang/Rewrite/ASTConsumers.h"
+#include "clang/Rewrite/FixItRewriter.h"
+#include "clang/Rewrite/Rewriters.h"
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Path.h"
+using namespace clang;
+
+//===----------------------------------------------------------------------===//
+// AST Consumer Actions
+//===----------------------------------------------------------------------===//
+
+ASTConsumer *HTMLPrintAction::CreateASTConsumer(CompilerInstance &CI,
+                                                llvm::StringRef InFile) {
+  if (llvm::raw_ostream *OS = CI.createDefaultOutputFile(false, InFile))
+    return CreateHTMLPrinter(OS, CI.getPreprocessor());
+  return 0;
+}
+
+FixItAction::FixItAction() {}
+FixItAction::~FixItAction() {}
+
+ASTConsumer *FixItAction::CreateASTConsumer(CompilerInstance &CI,
+                                            llvm::StringRef InFile) {
+  return new ASTConsumer();
+}
+
+namespace {
+class FixItRewriteInPlace : public FixItOptions {
+public:
+  std::string RewriteFilename(const std::string &Filename) { return Filename; }
+};
+
+class FixItActionSuffixInserter : public FixItOptions {
+  std::string NewSuffix;
+
+public:
+  FixItActionSuffixInserter(std::string NewSuffix, bool FixWhatYouCan)
+    : NewSuffix(NewSuffix) {
+      this->FixWhatYouCan = FixWhatYouCan;
+  }
+
+  std::string RewriteFilename(const std::string &Filename) {
+    llvm::SmallString<128> Path(Filename);
+    llvm::sys::path::replace_extension(Path,
+      NewSuffix + llvm::sys::path::extension(Path));
+    return Path.str();
+  }
+};
+} // end anonymous namespace
+
+bool FixItAction::BeginSourceFileAction(CompilerInstance &CI,
+                                        llvm::StringRef Filename) {
+  const FrontendOptions &FEOpts = getCompilerInstance().getFrontendOpts();
+  if (!FEOpts.FixItSuffix.empty()) {
+    FixItOpts.reset(new FixItActionSuffixInserter(FEOpts.FixItSuffix,
+                                                  FEOpts.FixWhatYouCan));
+  } else {
+    FixItOpts.reset(new FixItRewriteInPlace);
+    FixItOpts->FixWhatYouCan = FEOpts.FixWhatYouCan;
+  }
+  Rewriter.reset(new FixItRewriter(CI.getDiagnostics(), CI.getSourceManager(),
+                                   CI.getLangOpts(), FixItOpts.get()));
+  return true;
+}
+
+void FixItAction::EndSourceFileAction() {
+  // Otherwise rewrite all files.
+  Rewriter->WriteFixedFiles();
+}
+
+//===----------------------------------------------------------------------===//
+// Preprocessor Actions
+//===----------------------------------------------------------------------===//
+
+ASTConsumer *RewriteObjCAction::CreateASTConsumer(CompilerInstance &CI,
+                                                  llvm::StringRef InFile) {
+  if (llvm::raw_ostream *OS = CI.createDefaultOutputFile(false, InFile, "cpp"))
+    return CreateObjCRewriter(InFile, OS,
+                              CI.getDiagnostics(), CI.getLangOpts(),
+                              CI.getDiagnosticOpts().NoRewriteMacros);
+  return 0;
+}
+
+void RewriteMacrosAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+  llvm::raw_ostream *OS = CI.createDefaultOutputFile(true, getCurrentFile());
+  if (!OS) return;
+
+  RewriteMacrosInInput(CI.getPreprocessor(), OS);
+}
+
+void RewriteTestAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+  llvm::raw_ostream *OS = CI.createDefaultOutputFile(false, getCurrentFile());
+  if (!OS) return;
+
+  DoRewriteTest(CI.getPreprocessor(), OS);
+}
diff --git a/contrib/llvm/tools/clang/lib/Rewrite/HTMLPrint.cpp b/contrib/llvm/tools/clang/lib/Rewrite/HTMLPrint.cpp
new file mode 100644
index 0000000..f66bfcb
--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/Rewrite/HTMLPrint.cpp
@@ -0,0 +1,94 @@
+//===--- HTMLPrint.cpp - Source code -> HTML pretty-printing --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Pretty-printing of source code to HTML.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/ASTConsumers.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Decl.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Rewrite/HTMLRewrite.h"
+#include "clang/Rewrite/Rewriter.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace clang;
+
+//===----------------------------------------------------------------------===//
+// Functional HTML pretty-printing.
+//===----------------------------------------------------------------------===//
+
+namespace {
+  class HTMLPrinter : public ASTConsumer {
+    Rewriter R;
+    llvm::raw_ostream *Out;
+    Preprocessor &PP;
+    bool SyntaxHighlight, HighlightMacros;
+
+  public:
+    HTMLPrinter(llvm::raw_ostream *OS, Preprocessor &pp,
+                bool _SyntaxHighlight, bool _HighlightMacros)
+      : Out(OS), PP(pp), SyntaxHighlight(_SyntaxHighlight),
+        HighlightMacros(_HighlightMacros) {}
+
+    void Initialize(ASTContext &context);
+    void HandleTranslationUnit(ASTContext &Ctx);
+  };
+}
+
+ASTConsumer* clang::CreateHTMLPrinter(llvm::raw_ostream *OS,
+                                      Preprocessor &PP,
+                                      bool SyntaxHighlight,
+                                      bool HighlightMacros) {
+  return new HTMLPrinter(OS, PP, SyntaxHighlight, HighlightMacros);
+}
+
+void HTMLPrinter::Initialize(ASTContext &context) {
+  R.setSourceMgr(context.getSourceManager(), context.getLangOptions());
+}
+
+void HTMLPrinter::HandleTranslationUnit(ASTContext &Ctx) {
+  if (PP.getDiagnostics().hasErrorOccurred())
+    return;
+
+  // Format the file.
+  FileID FID = R.getSourceMgr().getMainFileID();
+  const FileEntry* Entry = R.getSourceMgr().getFileEntryForID(FID);
+  const char* Name;
+  // In some cases, in particular the case where the input is from stdin,
+  // there is no entry.  Fall back to the memory buffer for a name in those
+  // cases.
+  if (Entry)
+    Name = Entry->getName();
+  else
+    Name = R.getSourceMgr().getBuffer(FID)->getBufferIdentifier();
+
+  html::AddLineNumbers(R, FID);
+  html::AddHeaderFooterInternalBuiltinCSS(R, FID, Name);
+
+  // If we have a preprocessor, relex the file and syntax highlight.
+  // We might not have a preprocessor if we come from a deserialized AST file,
+  // for example.
+
+  if (SyntaxHighlight) html::SyntaxHighlight(R, FID, PP);
+  if (HighlightMacros) html::HighlightMacros(R, FID, PP);
+  html::EscapeText(R, FID, false, true);
+
+  // Emit the HTML.
+  const RewriteBuffer &RewriteBuf = R.getEditBuffer(FID);
+  char *Buffer = (char*)malloc(RewriteBuf.size());
+  std::copy(RewriteBuf.begin(), RewriteBuf.end(), Buffer);
+  Out->write(Buffer, RewriteBuf.size());
+  free(Buffer);
+}
diff --git a/contrib/llvm/tools/clang/lib/Rewrite/HTMLRewrite.cpp b/contrib/llvm/tools/clang/lib/Rewrite/HTMLRewrite.cpp
new file mode 100644
index 0000000..df08cd7
--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/Rewrite/HTMLRewrite.cpp
@@ -0,0 +1,580 @@
+//== HTMLRewrite.cpp - Translate source code into prettified HTML --*- 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 HTMLRewriter clas, which is used to translate the
+//  text of a source file into prettified HTML.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Rewrite/Rewriter.h"
+#include "clang/Rewrite/HTMLRewrite.h"
+#include "clang/Lex/TokenConcatenation.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Basic/SourceManager.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace clang;
+
+
+/// HighlightRange - Highlight a range in the source code with the specified
+/// start/end tags.  B/E must be in the same file.  This ensures that
+/// start/end tags are placed at the start/end of each line if the range is
+/// multiline.
+void html::HighlightRange(Rewriter &R, SourceLocation B, SourceLocation E,
+                          const char *StartTag, const char *EndTag) {
+  SourceManager &SM = R.getSourceMgr();
+  B = SM.getInstantiationLoc(B);
+  E = SM.getInstantiationLoc(E);
+  FileID FID = SM.getFileID(B);
+  assert(SM.getFileID(E) == FID && "B/E not in the same file!");
+
+  unsigned BOffset = SM.getFileOffset(B);
+  unsigned EOffset = SM.getFileOffset(E);
+
+  // Include the whole end token in the range.
+  EOffset += Lexer::MeasureTokenLength(E, R.getSourceMgr(), R.getLangOpts());
+
+  bool Invalid = false;
+  const char *BufferStart = SM.getBufferData(FID, &Invalid).data();
+  if (Invalid)
+    return;
+  
+  HighlightRange(R.getEditBuffer(FID), BOffset, EOffset,
+                 BufferStart, StartTag, EndTag);
+}
+
+/// HighlightRange - This is the same as the above method, but takes
+/// decomposed file locations.
+void html::HighlightRange(RewriteBuffer &RB, unsigned B, unsigned E,
+                          const char *BufferStart,
+                          const char *StartTag, const char *EndTag) {
+  // Insert the tag at the absolute start/end of the range.
+  RB.InsertTextAfter(B, StartTag);
+  RB.InsertTextBefore(E, EndTag);
+
+  // Scan the range to see if there is a \r or \n.  If so, and if the line is
+  // not blank, insert tags on that line as well.
+  bool HadOpenTag = true;
+
+  unsigned LastNonWhiteSpace = B;
+  for (unsigned i = B; i != E; ++i) {
+    switch (BufferStart[i]) {
+    case '\r':
+    case '\n':
+      // Okay, we found a newline in the range.  If we have an open tag, we need
+      // to insert a close tag at the first non-whitespace before the newline.
+      if (HadOpenTag)
+        RB.InsertTextBefore(LastNonWhiteSpace+1, EndTag);
+
+      // Instead of inserting an open tag immediately after the newline, we
+      // wait until we see a non-whitespace character.  This prevents us from
+      // inserting tags around blank lines, and also allows the open tag to
+      // be put *after* whitespace on a non-blank line.
+      HadOpenTag = false;
+      break;
+    case '\0':
+    case ' ':
+    case '\t':
+    case '\f':
+    case '\v':
+      // Ignore whitespace.
+      break;
+
+    default:
+      // If there is no tag open, do it now.
+      if (!HadOpenTag) {
+        RB.InsertTextAfter(i, StartTag);
+        HadOpenTag = true;
+      }
+
+      // Remember this character.
+      LastNonWhiteSpace = i;
+      break;
+    }
+  }
+}
+
+void html::EscapeText(Rewriter &R, FileID FID,
+                      bool EscapeSpaces, bool ReplaceTabs) {
+
+  const llvm::MemoryBuffer *Buf = R.getSourceMgr().getBuffer(FID);
+  const char* C = Buf->getBufferStart();
+  const char* FileEnd = Buf->getBufferEnd();
+
+  assert (C <= FileEnd);
+
+  RewriteBuffer &RB = R.getEditBuffer(FID);
+
+  unsigned ColNo = 0;
+  for (unsigned FilePos = 0; C != FileEnd ; ++C, ++FilePos) {
+    switch (*C) {
+    default: ++ColNo; break;
+    case '\n':
+    case '\r':
+      ColNo = 0;
+      break;
+
+    case ' ':
+      if (EscapeSpaces)
+        RB.ReplaceText(FilePos, 1, "&nbsp;");
+      ++ColNo;
+      break;
+    case '\f':
+      RB.ReplaceText(FilePos, 1, "<hr>");
+      ColNo = 0;
+      break;
+
+    case '\t': {
+      if (!ReplaceTabs)
+        break;
+      unsigned NumSpaces = 8-(ColNo&7);
+      if (EscapeSpaces)
+        RB.ReplaceText(FilePos, 1,
+                       llvm::StringRef("&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"
+                                       "&nbsp;&nbsp;&nbsp;", 6*NumSpaces));
+      else
+        RB.ReplaceText(FilePos, 1, llvm::StringRef("        ", NumSpaces));
+      ColNo += NumSpaces;
+      break;
+    }
+    case '<':
+      RB.ReplaceText(FilePos, 1, "&lt;");
+      ++ColNo;
+      break;
+
+    case '>':
+      RB.ReplaceText(FilePos, 1, "&gt;");
+      ++ColNo;
+      break;
+
+    case '&':
+      RB.ReplaceText(FilePos, 1, "&amp;");
+      ++ColNo;
+      break;
+    }
+  }
+}
+
+std::string html::EscapeText(const std::string& s, bool EscapeSpaces,
+                             bool ReplaceTabs) {
+
+  unsigned len = s.size();
+  std::string Str;
+  llvm::raw_string_ostream os(Str);
+
+  for (unsigned i = 0 ; i < len; ++i) {
+
+    char c = s[i];
+    switch (c) {
+    default:
+      os << c; break;
+
+    case ' ':
+      if (EscapeSpaces) os << "&nbsp;";
+      else os << ' ';
+      break;
+
+    case '\t':
+      if (ReplaceTabs) {
+        if (EscapeSpaces)
+          for (unsigned i = 0; i < 4; ++i)
+            os << "&nbsp;";
+        else
+          for (unsigned i = 0; i < 4; ++i)
+            os << " ";
+      }
+      else
+        os << c;
+
+      break;
+
+    case '<': os << "&lt;"; break;
+    case '>': os << "&gt;"; break;
+    case '&': os << "&amp;"; break;
+    }
+  }
+
+  return os.str();
+}
+
+static void AddLineNumber(RewriteBuffer &RB, unsigned LineNo,
+                          unsigned B, unsigned E) {
+  llvm::SmallString<256> Str;
+  llvm::raw_svector_ostream OS(Str);
+
+  OS << "<tr><td class=\"num\" id=\"LN"
+     << LineNo << "\">"
+     << LineNo << "</td><td class=\"line\">";
+
+  if (B == E) { // Handle empty lines.
+    OS << " </td></tr>";
+    RB.InsertTextBefore(B, OS.str());
+  } else {
+    RB.InsertTextBefore(B, OS.str());
+    RB.InsertTextBefore(E, "</td></tr>");
+  }
+}
+
+void html::AddLineNumbers(Rewriter& R, FileID FID) {
+
+  const llvm::MemoryBuffer *Buf = R.getSourceMgr().getBuffer(FID);
+  const char* FileBeg = Buf->getBufferStart();
+  const char* FileEnd = Buf->getBufferEnd();
+  const char* C = FileBeg;
+  RewriteBuffer &RB = R.getEditBuffer(FID);
+
+  assert (C <= FileEnd);
+
+  unsigned LineNo = 0;
+  unsigned FilePos = 0;
+
+  while (C != FileEnd) {
+
+    ++LineNo;
+    unsigned LineStartPos = FilePos;
+    unsigned LineEndPos = FileEnd - FileBeg;
+
+    assert (FilePos <= LineEndPos);
+    assert (C < FileEnd);
+
+    // Scan until the newline (or end-of-file).
+
+    while (C != FileEnd) {
+      char c = *C;
+      ++C;
+
+      if (c == '\n') {
+        LineEndPos = FilePos++;
+        break;
+      }
+
+      ++FilePos;
+    }
+
+    AddLineNumber(RB, LineNo, LineStartPos, LineEndPos);
+  }
+
+  // Add one big table tag that surrounds all of the code.
+  RB.InsertTextBefore(0, "<table class=\"code\">\n");
+  RB.InsertTextAfter(FileEnd - FileBeg, "</table>");
+}
+
+void html::AddHeaderFooterInternalBuiltinCSS(Rewriter& R, FileID FID,
+                                             const char *title) {
+
+  const llvm::MemoryBuffer *Buf = R.getSourceMgr().getBuffer(FID);
+  const char* FileStart = Buf->getBufferStart();
+  const char* FileEnd = Buf->getBufferEnd();
+
+  SourceLocation StartLoc = R.getSourceMgr().getLocForStartOfFile(FID);
+  SourceLocation EndLoc = StartLoc.getFileLocWithOffset(FileEnd-FileStart);
+
+  std::string s;
+  llvm::raw_string_ostream os(s);
+  os << "<!doctype html>\n" // Use HTML 5 doctype
+        "<html>\n<head>\n";
+
+  if (title)
+    os << "<title>" << html::EscapeText(title) << "</title>\n";
+
+  os << "<style type=\"text/css\">\n"
+      " body { color:#000000; background-color:#ffffff }\n"
+      " body { font-family:Helvetica, sans-serif; font-size:10pt }\n"
+      " h1 { font-size:14pt }\n"
+      " .code { border-collapse:collapse; width:100%; }\n"
+      " .code { font-family: \"Andale Mono\", monospace; font-size:10pt }\n"
+      " .code { line-height: 1.2em }\n"
+      " .comment { color: green; font-style: oblique }\n"
+      " .keyword { color: blue }\n"
+      " .string_literal { color: red }\n"
+      " .directive { color: darkmagenta }\n"
+      // Macro expansions.
+      " .expansion { display: none; }\n"
+      " .macro:hover .expansion { display: block; border: 2px solid #FF0000; "
+          "padding: 2px; background-color:#FFF0F0; font-weight: normal; "
+          "  -webkit-border-radius:5px;  -webkit-box-shadow:1px 1px 7px #000; "
+          "position: absolute; top: -1em; left:10em; z-index: 1 } \n"
+      " .macro { color: darkmagenta; background-color:LemonChiffon;"
+             // Macros are position: relative to provide base for expansions.
+             " position: relative }\n"
+      " .num { width:2.5em; padding-right:2ex; background-color:#eeeeee }\n"
+      " .num { text-align:right; font-size:8pt }\n"
+      " .num { color:#444444 }\n"
+      " .line { padding-left: 1ex; border-left: 3px solid #ccc }\n"
+      " .line { white-space: pre }\n"
+      " .msg { -webkit-box-shadow:1px 1px 7px #000 }\n"
+      " .msg { -webkit-border-radius:5px }\n"
+      " .msg { font-family:Helvetica, sans-serif; font-size:8pt }\n"
+      " .msg { float:left }\n"
+      " .msg { padding:0.25em 1ex 0.25em 1ex }\n"
+      " .msg { margin-top:10px; margin-bottom:10px }\n"
+      " .msg { font-weight:bold }\n"
+      " .msg { max-width:60em; word-wrap: break-word; white-space: pre-wrap }\n"
+      " .msgT { padding:0x; spacing:0x }\n"
+      " .msgEvent { background-color:#fff8b4; color:#000000 }\n"
+      " .msgControl { background-color:#bbbbbb; color:#000000 }\n"
+      " .mrange { background-color:#dfddf3 }\n"
+      " .mrange { border-bottom:1px solid #6F9DBE }\n"
+      " .PathIndex { font-weight: bold; padding:0px 5px 0px 5px; "
+        "margin-right:5px; }\n"
+      " .PathIndex { -webkit-border-radius:8px }\n"
+      " .PathIndexEvent { background-color:#bfba87 }\n"
+      " .PathIndexControl { background-color:#8c8c8c }\n"
+      " .CodeInsertionHint { font-weight: bold; background-color: #10dd10 }\n"
+      " .CodeRemovalHint { background-color:#de1010 }\n"
+      " .CodeRemovalHint { border-bottom:1px solid #6F9DBE }\n"
+      " table.simpletable {\n"
+      "   padding: 5px;\n"
+      "   font-size:12pt;\n"
+      "   margin:20px;\n"
+      "   border-collapse: collapse; border-spacing: 0px;\n"
+      " }\n"
+      " td.rowname {\n"
+      "   text-align:right; font-weight:bold; color:#444444;\n"
+      "   padding-right:2ex; }\n"
+      "</style>\n</head>\n<body>";
+
+  // Generate header
+  R.InsertTextBefore(StartLoc, os.str());
+  // Generate footer
+
+  R.InsertTextAfter(EndLoc, "</body></html>\n");
+}
+
+/// SyntaxHighlight - Relex the specified FileID and annotate the HTML with
+/// information about keywords, macro expansions etc.  This uses the macro
+/// table state from the end of the file, so it won't be perfectly perfect,
+/// but it will be reasonably close.
+void html::SyntaxHighlight(Rewriter &R, FileID FID, const Preprocessor &PP) {
+  RewriteBuffer &RB = R.getEditBuffer(FID);
+
+  const SourceManager &SM = PP.getSourceManager();
+  const llvm::MemoryBuffer *FromFile = SM.getBuffer(FID);
+  Lexer L(FID, FromFile, SM, PP.getLangOptions());
+  const char *BufferStart = L.getBufferStart();
+
+  // Inform the preprocessor that we want to retain comments as tokens, so we
+  // can highlight them.
+  L.SetCommentRetentionState(true);
+
+  // Lex all the tokens in raw mode, to avoid entering #includes or expanding
+  // macros.
+  Token Tok;
+  L.LexFromRawLexer(Tok);
+
+  while (Tok.isNot(tok::eof)) {
+    // Since we are lexing unexpanded tokens, all tokens are from the main
+    // FileID.
+    unsigned TokOffs = SM.getFileOffset(Tok.getLocation());
+    unsigned TokLen = Tok.getLength();
+    switch (Tok.getKind()) {
+    default: break;
+    case tok::identifier:
+      llvm_unreachable("tok::identifier in raw lexing mode!");
+      break;
+    case tok::raw_identifier: {
+      // Fill in Result.IdentifierInfo and update the token kind,
+      // looking up the identifier in the identifier table.
+      PP.LookUpIdentifierInfo(Tok);
+
+      // If this is a pp-identifier, for a keyword, highlight it as such.
+      if (Tok.isNot(tok::identifier))
+        HighlightRange(RB, TokOffs, TokOffs+TokLen, BufferStart,
+                       "<span class='keyword'>", "</span>");
+      break;
+    }
+    case tok::comment:
+      HighlightRange(RB, TokOffs, TokOffs+TokLen, BufferStart,
+                     "<span class='comment'>", "</span>");
+      break;
+    case tok::wide_string_literal:
+      // Chop off the L prefix
+      ++TokOffs;
+      --TokLen;
+      // FALL THROUGH.
+    case tok::string_literal:
+      HighlightRange(RB, TokOffs, TokOffs+TokLen, BufferStart,
+                     "<span class='string_literal'>", "</span>");
+      break;
+    case tok::hash: {
+      // If this is a preprocessor directive, all tokens to end of line are too.
+      if (!Tok.isAtStartOfLine())
+        break;
+
+      // Eat all of the tokens until we get to the next one at the start of
+      // line.
+      unsigned TokEnd = TokOffs+TokLen;
+      L.LexFromRawLexer(Tok);
+      while (!Tok.isAtStartOfLine() && Tok.isNot(tok::eof)) {
+        TokEnd = SM.getFileOffset(Tok.getLocation())+Tok.getLength();
+        L.LexFromRawLexer(Tok);
+      }
+
+      // Find end of line.  This is a hack.
+      HighlightRange(RB, TokOffs, TokEnd, BufferStart,
+                     "<span class='directive'>", "</span>");
+
+      // Don't skip the next token.
+      continue;
+    }
+    }
+
+    L.LexFromRawLexer(Tok);
+  }
+}
+
+namespace {
+/// IgnoringDiagClient - This is a diagnostic client that just ignores all
+/// diags.
+class IgnoringDiagClient : public DiagnosticClient {
+  void HandleDiagnostic(Diagnostic::Level DiagLevel,
+                        const DiagnosticInfo &Info) {
+    // Just ignore it.
+  }
+};
+}
+
+/// HighlightMacros - This uses the macro table state from the end of the
+/// file, to re-expand macros and insert (into the HTML) information about the
+/// macro expansions.  This won't be perfectly perfect, but it will be
+/// reasonably close.
+void html::HighlightMacros(Rewriter &R, FileID FID, const Preprocessor& PP) {
+  // Re-lex the raw token stream into a token buffer.
+  const SourceManager &SM = PP.getSourceManager();
+  std::vector<Token> TokenStream;
+
+  const llvm::MemoryBuffer *FromFile = SM.getBuffer(FID);
+  Lexer L(FID, FromFile, SM, PP.getLangOptions());
+
+  // Lex all the tokens in raw mode, to avoid entering #includes or expanding
+  // macros.
+  while (1) {
+    Token Tok;
+    L.LexFromRawLexer(Tok);
+
+    // If this is a # at the start of a line, discard it from the token stream.
+    // We don't want the re-preprocess step to see #defines, #includes or other
+    // preprocessor directives.
+    if (Tok.is(tok::hash) && Tok.isAtStartOfLine())
+      continue;
+
+    // If this is a ## token, change its kind to unknown so that repreprocessing
+    // it will not produce an error.
+    if (Tok.is(tok::hashhash))
+      Tok.setKind(tok::unknown);
+
+    // If this raw token is an identifier, the raw lexer won't have looked up
+    // the corresponding identifier info for it.  Do this now so that it will be
+    // macro expanded when we re-preprocess it.
+    if (Tok.is(tok::raw_identifier))
+      PP.LookUpIdentifierInfo(Tok);
+
+    TokenStream.push_back(Tok);
+
+    if (Tok.is(tok::eof)) break;
+  }
+
+  // Temporarily change the diagnostics object so that we ignore any generated
+  // diagnostics from this pass.
+  Diagnostic TmpDiags(PP.getDiagnostics().getDiagnosticIDs(),
+                      new IgnoringDiagClient);
+
+  // FIXME: This is a huge hack; we reuse the input preprocessor because we want
+  // its state, but we aren't actually changing it (we hope). This should really
+  // construct a copy of the preprocessor.
+  Preprocessor &TmpPP = const_cast<Preprocessor&>(PP);
+  Diagnostic *OldDiags = &TmpPP.getDiagnostics();
+  TmpPP.setDiagnostics(TmpDiags);
+
+  // Inform the preprocessor that we don't want comments.
+  TmpPP.SetCommentRetentionState(false, false);
+
+  // Enter the tokens we just lexed.  This will cause them to be macro expanded
+  // but won't enter sub-files (because we removed #'s).
+  TmpPP.EnterTokenStream(&TokenStream[0], TokenStream.size(), false, false);
+
+  TokenConcatenation ConcatInfo(TmpPP);
+
+  // Lex all the tokens.
+  Token Tok;
+  TmpPP.Lex(Tok);
+  while (Tok.isNot(tok::eof)) {
+    // Ignore non-macro tokens.
+    if (!Tok.getLocation().isMacroID()) {
+      TmpPP.Lex(Tok);
+      continue;
+    }
+
+    // Okay, we have the first token of a macro expansion: highlight the
+    // instantiation by inserting a start tag before the macro instantiation and
+    // end tag after it.
+    std::pair<SourceLocation, SourceLocation> LLoc =
+      SM.getInstantiationRange(Tok.getLocation());
+
+    // Ignore tokens whose instantiation location was not the main file.
+    if (SM.getFileID(LLoc.first) != FID) {
+      TmpPP.Lex(Tok);
+      continue;
+    }
+
+    assert(SM.getFileID(LLoc.second) == FID &&
+           "Start and end of expansion must be in the same ultimate file!");
+
+    std::string Expansion = EscapeText(TmpPP.getSpelling(Tok));
+    unsigned LineLen = Expansion.size();
+
+    Token PrevPrevTok;
+    Token PrevTok = Tok;
+    // Okay, eat this token, getting the next one.
+    TmpPP.Lex(Tok);
+
+    // Skip all the rest of the tokens that are part of this macro
+    // instantiation.  It would be really nice to pop up a window with all the
+    // spelling of the tokens or something.
+    while (!Tok.is(tok::eof) &&
+           SM.getInstantiationLoc(Tok.getLocation()) == LLoc.first) {
+      // Insert a newline if the macro expansion is getting large.
+      if (LineLen > 60) {
+        Expansion += "<br>";
+        LineLen = 0;
+      }
+
+      LineLen -= Expansion.size();
+
+      // If the tokens were already space separated, or if they must be to avoid
+      // them being implicitly pasted, add a space between them.
+      if (Tok.hasLeadingSpace() ||
+          ConcatInfo.AvoidConcat(PrevPrevTok, PrevTok, Tok))
+        Expansion += ' ';
+
+      // Escape any special characters in the token text.
+      Expansion += EscapeText(TmpPP.getSpelling(Tok));
+      LineLen += Expansion.size();
+
+      PrevPrevTok = PrevTok;
+      PrevTok = Tok;
+      TmpPP.Lex(Tok);
+    }
+
+
+    // Insert the expansion as the end tag, so that multi-line macros all get
+    // highlighted.
+    Expansion = "<span class='expansion'>" + Expansion + "</span></span>";
+
+    HighlightRange(R, LLoc.first, LLoc.second,
+                   "<span class='macro'>", Expansion.c_str());
+  }
+
+  // Restore diagnostics object back to its own thing.
+  TmpPP.setDiagnostics(*OldDiags);
+}
diff --git a/contrib/llvm/tools/clang/lib/Rewrite/RewriteMacros.cpp b/contrib/llvm/tools/clang/lib/Rewrite/RewriteMacros.cpp
new file mode 100644
index 0000000..0453098
--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/Rewrite/RewriteMacros.cpp
@@ -0,0 +1,217 @@
+//===--- RewriteMacros.cpp - Rewrite macros into their expansions ---------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This code rewrites macro invocations into their expansions.  This gives you
+// a macro expanded file that retains comments and #includes.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/Rewriters.h"
+#include "clang/Rewrite/Rewriter.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Basic/SourceManager.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Path.h"
+#include "llvm/ADT/OwningPtr.h"
+#include <cstdio>
+
+using namespace clang;
+
+/// isSameToken - Return true if the two specified tokens start have the same
+/// content.
+static bool isSameToken(Token &RawTok, Token &PPTok) {
+  // If two tokens have the same kind and the same identifier info, they are
+  // obviously the same.
+  if (PPTok.getKind() == RawTok.getKind() &&
+      PPTok.getIdentifierInfo() == RawTok.getIdentifierInfo())
+    return true;
+
+  // Otherwise, if they are different but have the same identifier info, they
+  // are also considered to be the same.  This allows keywords and raw lexed
+  // identifiers with the same name to be treated the same.
+  if (PPTok.getIdentifierInfo() &&
+      PPTok.getIdentifierInfo() == RawTok.getIdentifierInfo())
+    return true;
+
+  return false;
+}
+
+
+/// GetNextRawTok - Return the next raw token in the stream, skipping over
+/// comments if ReturnComment is false.
+static const Token &GetNextRawTok(const std::vector<Token> &RawTokens,
+                                  unsigned &CurTok, bool ReturnComment) {
+  assert(CurTok < RawTokens.size() && "Overran eof!");
+
+  // If the client doesn't want comments and we have one, skip it.
+  if (!ReturnComment && RawTokens[CurTok].is(tok::comment))
+    ++CurTok;
+
+  return RawTokens[CurTok++];
+}
+
+
+/// LexRawTokensFromMainFile - Lets all the raw tokens from the main file into
+/// the specified vector.
+static void LexRawTokensFromMainFile(Preprocessor &PP,
+                                     std::vector<Token> &RawTokens) {
+  SourceManager &SM = PP.getSourceManager();
+
+  // Create a lexer to lex all the tokens of the main file in raw mode.  Even
+  // though it is in raw mode, it will not return comments.
+  const llvm::MemoryBuffer *FromFile = SM.getBuffer(SM.getMainFileID());
+  Lexer RawLex(SM.getMainFileID(), FromFile, SM, PP.getLangOptions());
+
+  // Switch on comment lexing because we really do want them.
+  RawLex.SetCommentRetentionState(true);
+
+  Token RawTok;
+  do {
+    RawLex.LexFromRawLexer(RawTok);
+
+    // If we have an identifier with no identifier info for our raw token, look
+    // up the indentifier info.  This is important for equality comparison of
+    // identifier tokens.
+    if (RawTok.is(tok::raw_identifier))
+      PP.LookUpIdentifierInfo(RawTok);
+
+    RawTokens.push_back(RawTok);
+  } while (RawTok.isNot(tok::eof));
+}
+
+
+/// RewriteMacrosInInput - Implement -rewrite-macros mode.
+void clang::RewriteMacrosInInput(Preprocessor &PP, llvm::raw_ostream *OS) {
+  SourceManager &SM = PP.getSourceManager();
+
+  Rewriter Rewrite;
+  Rewrite.setSourceMgr(SM, PP.getLangOptions());
+  RewriteBuffer &RB = Rewrite.getEditBuffer(SM.getMainFileID());
+
+  std::vector<Token> RawTokens;
+  LexRawTokensFromMainFile(PP, RawTokens);
+  unsigned CurRawTok = 0;
+  Token RawTok = GetNextRawTok(RawTokens, CurRawTok, false);
+
+
+  // Get the first preprocessing token.
+  PP.EnterMainSourceFile();
+  Token PPTok;
+  PP.Lex(PPTok);
+
+  // Preprocess the input file in parallel with raw lexing the main file. Ignore
+  // all tokens that are preprocessed from a file other than the main file (e.g.
+  // a header).  If we see tokens that are in the preprocessed file but not the
+  // lexed file, we have a macro expansion.  If we see tokens in the lexed file
+  // that aren't in the preprocessed view, we have macros that expand to no
+  // tokens, or macro arguments etc.
+  while (RawTok.isNot(tok::eof) || PPTok.isNot(tok::eof)) {
+    SourceLocation PPLoc = SM.getInstantiationLoc(PPTok.getLocation());
+
+    // If PPTok is from a different source file, ignore it.
+    if (!SM.isFromMainFile(PPLoc)) {
+      PP.Lex(PPTok);
+      continue;
+    }
+
+    // If the raw file hits a preprocessor directive, they will be extra tokens
+    // in the raw file that don't exist in the preprocsesed file.  However, we
+    // choose to preserve them in the output file and otherwise handle them
+    // specially.
+    if (RawTok.is(tok::hash) && RawTok.isAtStartOfLine()) {
+      // If this is a #warning directive or #pragma mark (GNU extensions),
+      // comment the line out.
+      if (RawTokens[CurRawTok].is(tok::identifier)) {
+        const IdentifierInfo *II = RawTokens[CurRawTok].getIdentifierInfo();
+        if (II->getName() == "warning") {
+          // Comment out #warning.
+          RB.InsertTextAfter(SM.getFileOffset(RawTok.getLocation()), "//");
+        } else if (II->getName() == "pragma" &&
+                   RawTokens[CurRawTok+1].is(tok::identifier) &&
+                   (RawTokens[CurRawTok+1].getIdentifierInfo()->getName() ==
+                    "mark")) {
+          // Comment out #pragma mark.
+          RB.InsertTextAfter(SM.getFileOffset(RawTok.getLocation()), "//");
+        }
+      }
+
+      // Otherwise, if this is a #include or some other directive, just leave it
+      // in the file by skipping over the line.
+      RawTok = GetNextRawTok(RawTokens, CurRawTok, false);
+      while (!RawTok.isAtStartOfLine() && RawTok.isNot(tok::eof))
+        RawTok = GetNextRawTok(RawTokens, CurRawTok, false);
+      continue;
+    }
+
+    // Okay, both tokens are from the same file.  Get their offsets from the
+    // start of the file.
+    unsigned PPOffs = SM.getFileOffset(PPLoc);
+    unsigned RawOffs = SM.getFileOffset(RawTok.getLocation());
+
+    // If the offsets are the same and the token kind is the same, ignore them.
+    if (PPOffs == RawOffs && isSameToken(RawTok, PPTok)) {
+      RawTok = GetNextRawTok(RawTokens, CurRawTok, false);
+      PP.Lex(PPTok);
+      continue;
+    }
+
+    // If the PP token is farther along than the raw token, something was
+    // deleted.  Comment out the raw token.
+    if (RawOffs <= PPOffs) {
+      // Comment out a whole run of tokens instead of bracketing each one with
+      // comments.  Add a leading space if RawTok didn't have one.
+      bool HasSpace = RawTok.hasLeadingSpace();
+      RB.InsertTextAfter(RawOffs, " /*"+HasSpace);
+      unsigned EndPos;
+
+      do {
+        EndPos = RawOffs+RawTok.getLength();
+
+        RawTok = GetNextRawTok(RawTokens, CurRawTok, true);
+        RawOffs = SM.getFileOffset(RawTok.getLocation());
+
+        if (RawTok.is(tok::comment)) {
+          // Skip past the comment.
+          RawTok = GetNextRawTok(RawTokens, CurRawTok, false);
+          break;
+        }
+
+      } while (RawOffs <= PPOffs && !RawTok.isAtStartOfLine() &&
+               (PPOffs != RawOffs || !isSameToken(RawTok, PPTok)));
+
+      RB.InsertTextBefore(EndPos, "*/");
+      continue;
+    }
+
+    // Otherwise, there was a replacement an expansion.  Insert the new token
+    // in the output buffer.  Insert the whole run of new tokens at once to get
+    // them in the right order.
+    unsigned InsertPos = PPOffs;
+    std::string Expansion;
+    while (PPOffs < RawOffs) {
+      Expansion += ' ' + PP.getSpelling(PPTok);
+      PP.Lex(PPTok);
+      PPLoc = SM.getInstantiationLoc(PPTok.getLocation());
+      PPOffs = SM.getFileOffset(PPLoc);
+    }
+    Expansion += ' ';
+    RB.InsertTextBefore(InsertPos, Expansion);
+  }
+
+  // Get the buffer corresponding to MainFileID.  If we haven't changed it, then
+  // we are done.
+  if (const RewriteBuffer *RewriteBuf =
+      Rewrite.getRewriteBufferFor(SM.getMainFileID())) {
+    //printf("Changed:\n");
+    *OS << std::string(RewriteBuf->begin(), RewriteBuf->end());
+  } else {
+    fprintf(stderr, "No changes\n");
+  }
+  OS->flush();
+}
diff --git a/contrib/llvm/tools/clang/lib/Rewrite/RewriteObjC.cpp b/contrib/llvm/tools/clang/lib/Rewrite/RewriteObjC.cpp
new file mode 100644
index 0000000..d6e34ef
--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/Rewrite/RewriteObjC.cpp
@@ -0,0 +1,5959 @@
+//===--- RewriteObjC.cpp - Playground for the code rewriter ---------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Hacks and fun related to the code rewriter.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/ASTConsumers.h"
+#include "clang/Rewrite/Rewriter.h"
+#include "clang/AST/AST.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/ParentMap.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Basic/IdentifierTable.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Lex/Lexer.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/ADT/DenseSet.h"
+
+using namespace clang;
+using llvm::utostr;
+
+namespace {
+  class RewriteObjC : public ASTConsumer {
+    enum {
+      BLOCK_FIELD_IS_OBJECT   =  3,  /* id, NSObject, __attribute__((NSObject)),
+                                        block, ... */
+      BLOCK_FIELD_IS_BLOCK    =  7,  /* a block variable */
+      BLOCK_FIELD_IS_BYREF    =  8,  /* the on stack structure holding the 
+                                        __block variable */
+      BLOCK_FIELD_IS_WEAK     = 16,  /* declared __weak, only used in byref copy
+                                        helpers */
+      BLOCK_BYREF_CALLER      = 128, /* called from __block (byref) copy/dispose
+                                        support routines */
+      BLOCK_BYREF_CURRENT_MAX = 256
+    };
+    
+    enum {
+      BLOCK_NEEDS_FREE =        (1 << 24),
+      BLOCK_HAS_COPY_DISPOSE =  (1 << 25),
+      BLOCK_HAS_CXX_OBJ =       (1 << 26),
+      BLOCK_IS_GC =             (1 << 27),
+      BLOCK_IS_GLOBAL =         (1 << 28),
+      BLOCK_HAS_DESCRIPTOR =    (1 << 29)
+    };
+    
+    Rewriter Rewrite;
+    Diagnostic &Diags;
+    const LangOptions &LangOpts;
+    unsigned RewriteFailedDiag;
+    unsigned TryFinallyContainsReturnDiag;
+
+    ASTContext *Context;
+    SourceManager *SM;
+    TranslationUnitDecl *TUDecl;
+    FileID MainFileID;
+    const char *MainFileStart, *MainFileEnd;
+    SourceLocation LastIncLoc;
+
+    llvm::SmallVector<ObjCImplementationDecl *, 8> ClassImplementation;
+    llvm::SmallVector<ObjCCategoryImplDecl *, 8> CategoryImplementation;
+    llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCSynthesizedStructs;
+    llvm::SmallPtrSet<ObjCProtocolDecl*, 8> ObjCSynthesizedProtocols;
+    llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCForwardDecls;
+    llvm::DenseMap<ObjCMethodDecl*, std::string> MethodInternalNames;
+    llvm::SmallVector<Stmt *, 32> Stmts;
+    llvm::SmallVector<int, 8> ObjCBcLabelNo;
+    // Remember all the @protocol(<expr>) expressions.
+    llvm::SmallPtrSet<ObjCProtocolDecl *, 32> ProtocolExprDecls;
+    
+    llvm::DenseSet<uint64_t> CopyDestroyCache;
+    
+    unsigned NumObjCStringLiterals;
+
+    FunctionDecl *MsgSendFunctionDecl;
+    FunctionDecl *MsgSendSuperFunctionDecl;
+    FunctionDecl *MsgSendStretFunctionDecl;
+    FunctionDecl *MsgSendSuperStretFunctionDecl;
+    FunctionDecl *MsgSendFpretFunctionDecl;
+    FunctionDecl *GetClassFunctionDecl;
+    FunctionDecl *GetMetaClassFunctionDecl;
+    FunctionDecl *GetSuperClassFunctionDecl;
+    FunctionDecl *SelGetUidFunctionDecl;
+    FunctionDecl *CFStringFunctionDecl;
+    FunctionDecl *SuperContructorFunctionDecl;
+
+    // ObjC string constant support.
+    VarDecl *ConstantStringClassReference;
+    RecordDecl *NSStringRecord;
+
+    // ObjC foreach break/continue generation support.
+    int BcLabelCount;
+
+    // Needed for super.
+    ObjCMethodDecl *CurMethodDef;
+    RecordDecl *SuperStructDecl;
+    RecordDecl *ConstantStringDecl;
+
+    TypeDecl *ProtocolTypeDecl;
+    QualType getProtocolType();
+
+    // Needed for header files being rewritten
+    bool IsHeader;
+
+    std::string InFileName;
+    llvm::raw_ostream* OutFile;
+
+    bool SilenceRewriteMacroWarning;
+    bool objc_impl_method;
+
+    std::string Preamble;
+
+    // Block expressions.
+    llvm::SmallVector<BlockExpr *, 32> Blocks;
+    llvm::SmallVector<int, 32> InnerDeclRefsCount;
+    llvm::SmallVector<BlockDeclRefExpr *, 32> InnerDeclRefs;
+    
+    llvm::SmallVector<BlockDeclRefExpr *, 32> BlockDeclRefs;
+
+    // Block related declarations.
+    llvm::SmallVector<ValueDecl *, 8> BlockByCopyDecls;
+    llvm::SmallPtrSet<ValueDecl *, 8> BlockByCopyDeclsPtrSet;
+    llvm::SmallVector<ValueDecl *, 8> BlockByRefDecls;
+    llvm::SmallPtrSet<ValueDecl *, 8> BlockByRefDeclsPtrSet;
+    llvm::DenseMap<ValueDecl *, unsigned> BlockByRefDeclNo;
+    llvm::SmallPtrSet<ValueDecl *, 8> ImportedBlockDecls;
+    llvm::SmallPtrSet<VarDecl *, 8> ImportedLocalExternalDecls;
+    
+    llvm::DenseMap<BlockExpr *, std::string> RewrittenBlockExprs;
+
+    // This maps a property to it's assignment statement.
+    llvm::DenseMap<Expr *, BinaryOperator *> PropSetters;
+    // This maps a property to it's synthesied message expression.
+    // This allows us to rewrite chained getters (e.g. o.a.b.c).
+    llvm::DenseMap<Expr *, Stmt *> PropGetters;
+
+    // This maps an original source AST to it's rewritten form. This allows
+    // us to avoid rewriting the same node twice (which is very uncommon).
+    // This is needed to support some of the exotic property rewriting.
+    llvm::DenseMap<Stmt *, Stmt *> ReplacedNodes;
+
+    FunctionDecl *CurFunctionDef;
+    FunctionDecl *CurFunctionDeclToDeclareForBlock;
+    VarDecl *GlobalVarDecl;
+
+    bool DisableReplaceStmt;
+
+    static const int OBJC_ABI_VERSION = 7;
+  public:
+    virtual void Initialize(ASTContext &context);
+
+    // Top Level Driver code.
+    virtual void HandleTopLevelDecl(DeclGroupRef D) {
+      for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I)
+        HandleTopLevelSingleDecl(*I);
+    }
+    void HandleTopLevelSingleDecl(Decl *D);
+    void HandleDeclInMainFile(Decl *D);
+    RewriteObjC(std::string inFile, llvm::raw_ostream *OS,
+                Diagnostic &D, const LangOptions &LOpts,
+                bool silenceMacroWarn);
+
+    ~RewriteObjC() {}
+
+    virtual void HandleTranslationUnit(ASTContext &C);
+
+    void ReplaceStmt(Stmt *Old, Stmt *New) {
+      Stmt *ReplacingStmt = ReplacedNodes[Old];
+
+      if (ReplacingStmt)
+        return; // We can't rewrite the same node twice.
+
+      if (DisableReplaceStmt)
+        return; // Used when rewriting the assignment of a property setter.
+
+      // If replacement succeeded or warning disabled return with no warning.
+      if (!Rewrite.ReplaceStmt(Old, New)) {
+        ReplacedNodes[Old] = New;
+        return;
+      }
+      if (SilenceRewriteMacroWarning)
+        return;
+      Diags.Report(Context->getFullLoc(Old->getLocStart()), RewriteFailedDiag)
+                   << Old->getSourceRange();
+    }
+
+    void ReplaceStmtWithRange(Stmt *Old, Stmt *New, SourceRange SrcRange) {
+      // Measure the old text.
+      int Size = Rewrite.getRangeSize(SrcRange);
+      if (Size == -1) {
+        Diags.Report(Context->getFullLoc(Old->getLocStart()), RewriteFailedDiag)
+                     << Old->getSourceRange();
+        return;
+      }
+      // Get the new text.
+      std::string SStr;
+      llvm::raw_string_ostream S(SStr);
+      New->printPretty(S, *Context, 0, PrintingPolicy(LangOpts));
+      const std::string &Str = S.str();
+
+      // If replacement succeeded or warning disabled return with no warning.
+      if (!Rewrite.ReplaceText(SrcRange.getBegin(), Size, Str)) {
+        ReplacedNodes[Old] = New;
+        return;
+      }
+      if (SilenceRewriteMacroWarning)
+        return;
+      Diags.Report(Context->getFullLoc(Old->getLocStart()), RewriteFailedDiag)
+                   << Old->getSourceRange();
+    }
+
+    void InsertText(SourceLocation Loc, llvm::StringRef Str,
+                    bool InsertAfter = true) {
+      // If insertion succeeded or warning disabled return with no warning.
+      if (!Rewrite.InsertText(Loc, Str, InsertAfter) ||
+          SilenceRewriteMacroWarning)
+        return;
+
+      Diags.Report(Context->getFullLoc(Loc), RewriteFailedDiag);
+    }
+
+    void ReplaceText(SourceLocation Start, unsigned OrigLength,
+                     llvm::StringRef Str) {
+      // If removal succeeded or warning disabled return with no warning.
+      if (!Rewrite.ReplaceText(Start, OrigLength, Str) ||
+          SilenceRewriteMacroWarning)
+        return;
+
+      Diags.Report(Context->getFullLoc(Start), RewriteFailedDiag);
+    }
+
+    // Syntactic Rewriting.
+    void RewriteInclude();
+    void RewriteForwardClassDecl(ObjCClassDecl *Dcl);
+    void RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
+                                 ObjCImplementationDecl *IMD,
+                                 ObjCCategoryImplDecl *CID);
+    void RewriteInterfaceDecl(ObjCInterfaceDecl *Dcl);
+    void RewriteImplementationDecl(Decl *Dcl);
+    void RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
+                               ObjCMethodDecl *MDecl, std::string &ResultStr);
+    void RewriteTypeIntoString(QualType T, std::string &ResultStr,
+                               const FunctionType *&FPRetType);
+    void RewriteByRefString(std::string &ResultStr, const std::string &Name,
+                            ValueDecl *VD, bool def=false);
+    void RewriteCategoryDecl(ObjCCategoryDecl *Dcl);
+    void RewriteProtocolDecl(ObjCProtocolDecl *Dcl);
+    void RewriteForwardProtocolDecl(ObjCForwardProtocolDecl *Dcl);
+    void RewriteMethodDeclaration(ObjCMethodDecl *Method);
+    void RewriteProperty(ObjCPropertyDecl *prop);
+    void RewriteFunctionDecl(FunctionDecl *FD);
+    void RewriteBlockPointerType(std::string& Str, QualType Type);
+    void RewriteBlockPointerTypeVariable(std::string& Str, ValueDecl *VD);
+    void RewriteBlockLiteralFunctionDecl(FunctionDecl *FD);
+    void RewriteObjCQualifiedInterfaceTypes(Decl *Dcl);
+    void RewriteTypeOfDecl(VarDecl *VD);
+    void RewriteObjCQualifiedInterfaceTypes(Expr *E);
+    bool needToScanForQualifiers(QualType T);
+    QualType getSuperStructType();
+    QualType getConstantStringStructType();
+    QualType convertFunctionTypeOfBlocks(const FunctionType *FT);
+    bool BufferContainsPPDirectives(const char *startBuf, const char *endBuf);
+
+    // Expression Rewriting.
+    Stmt *RewriteFunctionBodyOrGlobalInitializer(Stmt *S);
+    void CollectPropertySetters(Stmt *S);
+
+    Stmt *CurrentBody;
+    ParentMap *PropParentMap; // created lazily.
+
+    Stmt *RewriteAtEncode(ObjCEncodeExpr *Exp);
+    Stmt *RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV, SourceLocation OrigStart,
+                                 bool &replaced);
+    Stmt *RewriteObjCNestedIvarRefExpr(Stmt *S, bool &replaced);
+    Stmt *RewritePropertyOrImplicitGetter(Expr *PropOrGetterRefExpr);
+    Stmt *RewritePropertyOrImplicitSetter(BinaryOperator *BinOp, Expr *newStmt,
+                                SourceRange SrcRange);
+    Stmt *RewriteAtSelector(ObjCSelectorExpr *Exp);
+    Stmt *RewriteMessageExpr(ObjCMessageExpr *Exp);
+    Stmt *RewriteObjCStringLiteral(ObjCStringLiteral *Exp);
+    Stmt *RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp);
+    void WarnAboutReturnGotoStmts(Stmt *S);
+    void HasReturnStmts(Stmt *S, bool &hasReturns);
+    void RewriteTryReturnStmts(Stmt *S);
+    void RewriteSyncReturnStmts(Stmt *S, std::string buf);
+    Stmt *RewriteObjCTryStmt(ObjCAtTryStmt *S);
+    Stmt *RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S);
+    Stmt *RewriteObjCThrowStmt(ObjCAtThrowStmt *S);
+    Stmt *RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
+                                       SourceLocation OrigEnd);
+    bool IsDeclStmtInForeachHeader(DeclStmt *DS);
+    CallExpr *SynthesizeCallToFunctionDecl(FunctionDecl *FD,
+                                      Expr **args, unsigned nargs,
+                                      SourceLocation StartLoc=SourceLocation(),
+                                      SourceLocation EndLoc=SourceLocation());
+    Stmt *SynthMessageExpr(ObjCMessageExpr *Exp,
+                           SourceLocation StartLoc=SourceLocation(),
+                           SourceLocation EndLoc=SourceLocation());
+    Stmt *RewriteBreakStmt(BreakStmt *S);
+    Stmt *RewriteContinueStmt(ContinueStmt *S);
+    void SynthCountByEnumWithState(std::string &buf);
+
+    void SynthMsgSendFunctionDecl();
+    void SynthMsgSendSuperFunctionDecl();
+    void SynthMsgSendStretFunctionDecl();
+    void SynthMsgSendFpretFunctionDecl();
+    void SynthMsgSendSuperStretFunctionDecl();
+    void SynthGetClassFunctionDecl();
+    void SynthGetMetaClassFunctionDecl();
+    void SynthGetSuperClassFunctionDecl();
+    void SynthSelGetUidFunctionDecl();
+    void SynthSuperContructorFunctionDecl();
+
+    // Metadata emission.
+    void RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
+                                  std::string &Result);
+
+    void RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *CDecl,
+                                     std::string &Result);
+
+    template<typename MethodIterator>
+    void RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
+                                    MethodIterator MethodEnd,
+                                    bool IsInstanceMethod,
+                                    llvm::StringRef prefix,
+                                    llvm::StringRef ClassName,
+                                    std::string &Result);
+
+    void RewriteObjCProtocolMetaData(ObjCProtocolDecl *Protocol,
+                                     llvm::StringRef prefix,
+                                     llvm::StringRef ClassName,
+                                     std::string &Result);
+    void RewriteObjCProtocolListMetaData(const ObjCList<ObjCProtocolDecl> &Prots,
+                                         llvm::StringRef prefix,
+                                         llvm::StringRef ClassName,
+                                         std::string &Result);
+    void SynthesizeObjCInternalStruct(ObjCInterfaceDecl *CDecl,
+                                      std::string &Result);
+    void SynthesizeIvarOffsetComputation(ObjCIvarDecl *ivar,
+                                         std::string &Result);
+    void RewriteImplementations();
+    void SynthesizeMetaDataIntoBuffer(std::string &Result);
+
+    // Block rewriting.
+    void RewriteBlocksInFunctionProtoType(QualType funcType, NamedDecl *D);
+    void CheckFunctionPointerDecl(QualType dType, NamedDecl *ND);
+
+    void InsertBlockLiteralsWithinFunction(FunctionDecl *FD);
+    void InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD);
+
+    // Block specific rewrite rules.
+    void RewriteBlockPointerDecl(NamedDecl *VD);
+    void RewriteByRefVar(VarDecl *VD);
+    std::string SynthesizeByrefCopyDestroyHelper(VarDecl *VD, int flag);
+    Stmt *RewriteBlockDeclRefExpr(Expr *VD);
+    Stmt *RewriteLocalVariableExternalStorage(DeclRefExpr *DRE);
+    void RewriteBlockPointerFunctionArgs(FunctionDecl *FD);
+
+    std::string SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
+                                      llvm::StringRef funcName, std::string Tag);
+    std::string SynthesizeBlockFunc(BlockExpr *CE, int i,
+                                      llvm::StringRef funcName, std::string Tag);
+    std::string SynthesizeBlockImpl(BlockExpr *CE, 
+                                    std::string Tag, std::string Desc);
+    std::string SynthesizeBlockDescriptor(std::string DescTag, 
+                                          std::string ImplTag,
+                                          int i, llvm::StringRef funcName,
+                                          unsigned hasCopy);
+    Stmt *SynthesizeBlockCall(CallExpr *Exp, const Expr* BlockExp);
+    void SynthesizeBlockLiterals(SourceLocation FunLocStart,
+                                 llvm::StringRef FunName);
+    void RewriteRecordBody(RecordDecl *RD);
+
+    void CollectBlockDeclRefInfo(BlockExpr *Exp);
+    void GetBlockDeclRefExprs(Stmt *S);
+    void GetInnerBlockDeclRefExprs(Stmt *S, 
+                llvm::SmallVector<BlockDeclRefExpr *, 8> &InnerBlockDeclRefs,
+                llvm::SmallPtrSet<const DeclContext *, 8> &InnerContexts);
+
+    // We avoid calling Type::isBlockPointerType(), since it operates on the
+    // canonical type. We only care if the top-level type is a closure pointer.
+    bool isTopLevelBlockPointerType(QualType T) {
+      return isa<BlockPointerType>(T);
+    }
+
+    /// convertBlockPointerToFunctionPointer - Converts a block-pointer type
+    /// to a function pointer type and upon success, returns true; false
+    /// otherwise.
+    bool convertBlockPointerToFunctionPointer(QualType &T) {
+      if (isTopLevelBlockPointerType(T)) {
+        const BlockPointerType *BPT = T->getAs<BlockPointerType>();
+        T = Context->getPointerType(BPT->getPointeeType());
+        return true;
+      }
+      return false;
+    }
+    
+    void convertToUnqualifiedObjCType(QualType &T) {
+      if (T->isObjCQualifiedIdType())
+        T = Context->getObjCIdType();
+      else if (T->isObjCQualifiedClassType())
+        T = Context->getObjCClassType();
+      else if (T->isObjCObjectPointerType() &&
+               T->getPointeeType()->isObjCQualifiedInterfaceType())
+        T = Context->getObjCIdType();
+    }
+    
+    // FIXME: This predicate seems like it would be useful to add to ASTContext.
+    bool isObjCType(QualType T) {
+      if (!LangOpts.ObjC1 && !LangOpts.ObjC2)
+        return false;
+
+      QualType OCT = Context->getCanonicalType(T).getUnqualifiedType();
+
+      if (OCT == Context->getCanonicalType(Context->getObjCIdType()) ||
+          OCT == Context->getCanonicalType(Context->getObjCClassType()))
+        return true;
+
+      if (const PointerType *PT = OCT->getAs<PointerType>()) {
+        if (isa<ObjCInterfaceType>(PT->getPointeeType()) ||
+            PT->getPointeeType()->isObjCQualifiedIdType())
+          return true;
+      }
+      return false;
+    }
+    bool PointerTypeTakesAnyBlockArguments(QualType QT);
+    bool PointerTypeTakesAnyObjCQualifiedType(QualType QT);
+    void GetExtentOfArgList(const char *Name, const char *&LParen,
+                            const char *&RParen);
+    void RewriteCastExpr(CStyleCastExpr *CE);
+
+    FunctionDecl *SynthBlockInitFunctionDecl(llvm::StringRef name);
+    Stmt *SynthBlockInitExpr(BlockExpr *Exp,
+            const llvm::SmallVector<BlockDeclRefExpr *, 8> &InnerBlockDeclRefs);
+
+    void QuoteDoublequotes(std::string &From, std::string &To) {
+      for (unsigned i = 0; i < From.length(); i++) {
+        if (From[i] == '"')
+          To += "\\\"";
+        else
+          To += From[i];
+      }
+    }
+
+    QualType getSimpleFunctionType(QualType result,
+                                   const QualType *args,
+                                   unsigned numArgs,
+                                   bool variadic = false) {
+      FunctionProtoType::ExtProtoInfo fpi;
+      fpi.Variadic = variadic;
+      return Context->getFunctionType(result, args, numArgs, fpi);
+    }
+  };
+
+  // Helper function: create a CStyleCastExpr with trivial type source info.
+  CStyleCastExpr* NoTypeInfoCStyleCastExpr(ASTContext *Ctx, QualType Ty,
+                                           CastKind Kind, Expr *E) {
+    TypeSourceInfo *TInfo = Ctx->getTrivialTypeSourceInfo(Ty, SourceLocation());
+    return CStyleCastExpr::Create(*Ctx, Ty, VK_RValue, Kind, E, 0, TInfo,
+                                  SourceLocation(), SourceLocation());
+  }
+}
+
+void RewriteObjC::RewriteBlocksInFunctionProtoType(QualType funcType,
+                                                   NamedDecl *D) {
+  if (const FunctionProtoType *fproto
+      = dyn_cast<FunctionProtoType>(funcType.IgnoreParens())) {
+    for (FunctionProtoType::arg_type_iterator I = fproto->arg_type_begin(),
+         E = fproto->arg_type_end(); I && (I != E); ++I)
+      if (isTopLevelBlockPointerType(*I)) {
+        // All the args are checked/rewritten. Don't call twice!
+        RewriteBlockPointerDecl(D);
+        break;
+      }
+  }
+}
+
+void RewriteObjC::CheckFunctionPointerDecl(QualType funcType, NamedDecl *ND) {
+  const PointerType *PT = funcType->getAs<PointerType>();
+  if (PT && PointerTypeTakesAnyBlockArguments(funcType))
+    RewriteBlocksInFunctionProtoType(PT->getPointeeType(), ND);
+}
+
+static bool IsHeaderFile(const std::string &Filename) {
+  std::string::size_type DotPos = Filename.rfind('.');
+
+  if (DotPos == std::string::npos) {
+    // no file extension
+    return false;
+  }
+
+  std::string Ext = std::string(Filename.begin()+DotPos+1, Filename.end());
+  // C header: .h
+  // C++ header: .hh or .H;
+  return Ext == "h" || Ext == "hh" || Ext == "H";
+}
+
+RewriteObjC::RewriteObjC(std::string inFile, llvm::raw_ostream* OS,
+                         Diagnostic &D, const LangOptions &LOpts,
+                         bool silenceMacroWarn)
+      : Diags(D), LangOpts(LOpts), InFileName(inFile), OutFile(OS),
+        SilenceRewriteMacroWarning(silenceMacroWarn) {
+  IsHeader = IsHeaderFile(inFile);
+  RewriteFailedDiag = Diags.getCustomDiagID(Diagnostic::Warning,
+               "rewriting sub-expression within a macro (may not be correct)");
+  TryFinallyContainsReturnDiag = Diags.getCustomDiagID(Diagnostic::Warning,
+               "rewriter doesn't support user-specified control flow semantics "
+               "for @try/@finally (code may not execute properly)");
+}
+
+ASTConsumer *clang::CreateObjCRewriter(const std::string& InFile,
+                                       llvm::raw_ostream* OS,
+                                       Diagnostic &Diags,
+                                       const LangOptions &LOpts,
+                                       bool SilenceRewriteMacroWarning) {
+  return new RewriteObjC(InFile, OS, Diags, LOpts, SilenceRewriteMacroWarning);
+}
+
+void RewriteObjC::Initialize(ASTContext &context) {
+  Context = &context;
+  SM = &Context->getSourceManager();
+  TUDecl = Context->getTranslationUnitDecl();
+  MsgSendFunctionDecl = 0;
+  MsgSendSuperFunctionDecl = 0;
+  MsgSendStretFunctionDecl = 0;
+  MsgSendSuperStretFunctionDecl = 0;
+  MsgSendFpretFunctionDecl = 0;
+  GetClassFunctionDecl = 0;
+  GetMetaClassFunctionDecl = 0;
+  GetSuperClassFunctionDecl = 0;
+  SelGetUidFunctionDecl = 0;
+  CFStringFunctionDecl = 0;
+  ConstantStringClassReference = 0;
+  NSStringRecord = 0;
+  CurMethodDef = 0;
+  CurFunctionDef = 0;
+  CurFunctionDeclToDeclareForBlock = 0;
+  GlobalVarDecl = 0;
+  SuperStructDecl = 0;
+  ProtocolTypeDecl = 0;
+  ConstantStringDecl = 0;
+  BcLabelCount = 0;
+  SuperContructorFunctionDecl = 0;
+  NumObjCStringLiterals = 0;
+  PropParentMap = 0;
+  CurrentBody = 0;
+  DisableReplaceStmt = false;
+  objc_impl_method = false;
+
+  // Get the ID and start/end of the main file.
+  MainFileID = SM->getMainFileID();
+  const llvm::MemoryBuffer *MainBuf = SM->getBuffer(MainFileID);
+  MainFileStart = MainBuf->getBufferStart();
+  MainFileEnd = MainBuf->getBufferEnd();
+
+  Rewrite.setSourceMgr(Context->getSourceManager(), Context->getLangOptions());
+
+  // declaring objc_selector outside the parameter list removes a silly
+  // scope related warning...
+  if (IsHeader)
+    Preamble = "#pragma once\n";
+  Preamble += "struct objc_selector; struct objc_class;\n";
+  Preamble += "struct __rw_objc_super { struct objc_object *object; ";
+  Preamble += "struct objc_object *superClass; ";
+  if (LangOpts.Microsoft) {
+    // Add a constructor for creating temporary objects.
+    Preamble += "__rw_objc_super(struct objc_object *o, struct objc_object *s) "
+                ": ";
+    Preamble += "object(o), superClass(s) {} ";
+  }
+  Preamble += "};\n";
+  Preamble += "#ifndef _REWRITER_typedef_Protocol\n";
+  Preamble += "typedef struct objc_object Protocol;\n";
+  Preamble += "#define _REWRITER_typedef_Protocol\n";
+  Preamble += "#endif\n";
+  if (LangOpts.Microsoft) {
+    Preamble += "#define __OBJC_RW_DLLIMPORT extern \"C\" __declspec(dllimport)\n";
+    Preamble += "#define __OBJC_RW_STATICIMPORT extern \"C\"\n";
+  } else
+  Preamble += "#define __OBJC_RW_DLLIMPORT extern\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_msgSend";
+  Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_msgSendSuper";
+  Preamble += "(struct objc_super *, struct objc_selector *, ...);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_msgSend_stret";
+  Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_msgSendSuper_stret";
+  Preamble += "(struct objc_super *, struct objc_selector *, ...);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT double objc_msgSend_fpret";
+  Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_getClass";
+  Preamble += "(const char *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *class_getSuperclass";
+  Preamble += "(struct objc_class *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_getMetaClass";
+  Preamble += "(const char *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_throw(struct objc_object *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_try_enter(void *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_try_exit(void *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_exception_extract(void *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT int objc_exception_match";
+  Preamble += "(struct objc_class *, struct objc_object *);\n";
+  // @synchronized hooks.
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_sync_enter(struct objc_object *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_sync_exit(struct objc_object *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT Protocol *objc_getProtocol(const char *);\n";
+  Preamble += "#ifndef __FASTENUMERATIONSTATE\n";
+  Preamble += "struct __objcFastEnumerationState {\n\t";
+  Preamble += "unsigned long state;\n\t";
+  Preamble += "void **itemsPtr;\n\t";
+  Preamble += "unsigned long *mutationsPtr;\n\t";
+  Preamble += "unsigned long extra[5];\n};\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_enumerationMutation(struct objc_object *);\n";
+  Preamble += "#define __FASTENUMERATIONSTATE\n";
+  Preamble += "#endif\n";
+  Preamble += "#ifndef __NSCONSTANTSTRINGIMPL\n";
+  Preamble += "struct __NSConstantStringImpl {\n";
+  Preamble += "  int *isa;\n";
+  Preamble += "  int flags;\n";
+  Preamble += "  char *str;\n";
+  Preamble += "  long length;\n";
+  Preamble += "};\n";
+  Preamble += "#ifdef CF_EXPORT_CONSTANT_STRING\n";
+  Preamble += "extern \"C\" __declspec(dllexport) int __CFConstantStringClassReference[];\n";
+  Preamble += "#else\n";
+  Preamble += "__OBJC_RW_DLLIMPORT int __CFConstantStringClassReference[];\n";
+  Preamble += "#endif\n";
+  Preamble += "#define __NSCONSTANTSTRINGIMPL\n";
+  Preamble += "#endif\n";
+  // Blocks preamble.
+  Preamble += "#ifndef BLOCK_IMPL\n";
+  Preamble += "#define BLOCK_IMPL\n";
+  Preamble += "struct __block_impl {\n";
+  Preamble += "  void *isa;\n";
+  Preamble += "  int Flags;\n";
+  Preamble += "  int Reserved;\n";
+  Preamble += "  void *FuncPtr;\n";
+  Preamble += "};\n";
+  Preamble += "// Runtime copy/destroy helper functions (from Block_private.h)\n";
+  Preamble += "#ifdef __OBJC_EXPORT_BLOCKS\n";
+  Preamble += "extern \"C\" __declspec(dllexport) "
+              "void _Block_object_assign(void *, const void *, const int);\n";
+  Preamble += "extern \"C\" __declspec(dllexport) void _Block_object_dispose(const void *, const int);\n";
+  Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteGlobalBlock[32];\n";
+  Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteStackBlock[32];\n";
+  Preamble += "#else\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_assign(void *, const void *, const int);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_dispose(const void *, const int);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteGlobalBlock[32];\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteStackBlock[32];\n";
+  Preamble += "#endif\n";
+  Preamble += "#endif\n";
+  if (LangOpts.Microsoft) {
+    Preamble += "#undef __OBJC_RW_DLLIMPORT\n";
+    Preamble += "#undef __OBJC_RW_STATICIMPORT\n";
+    Preamble += "#ifndef KEEP_ATTRIBUTES\n";  // We use this for clang tests.
+    Preamble += "#define __attribute__(X)\n";
+    Preamble += "#endif\n";
+    Preamble += "#define __weak\n";
+  }
+  else {
+    Preamble += "#define __block\n";
+    Preamble += "#define __weak\n";
+  }
+  // NOTE! Windows uses LLP64 for 64bit mode. So, cast pointer to long long
+  // as this avoids warning in any 64bit/32bit compilation model.
+  Preamble += "\n#define __OFFSETOFIVAR__(TYPE, MEMBER) ((long long) &((TYPE *)0)->MEMBER)\n";
+}
+
+
+//===----------------------------------------------------------------------===//
+// Top Level Driver Code
+//===----------------------------------------------------------------------===//
+
+void RewriteObjC::HandleTopLevelSingleDecl(Decl *D) {
+  if (Diags.hasErrorOccurred())
+    return;
+
+  // Two cases: either the decl could be in the main file, or it could be in a
+  // #included file.  If the former, rewrite it now.  If the later, check to see
+  // if we rewrote the #include/#import.
+  SourceLocation Loc = D->getLocation();
+  Loc = SM->getInstantiationLoc(Loc);
+
+  // If this is for a builtin, ignore it.
+  if (Loc.isInvalid()) return;
+
+  // Look for built-in declarations that we need to refer during the rewrite.
+  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
+    RewriteFunctionDecl(FD);
+  } else if (VarDecl *FVD = dyn_cast<VarDecl>(D)) {
+    // declared in <Foundation/NSString.h>
+    if (FVD->getName() == "_NSConstantStringClassReference") {
+      ConstantStringClassReference = FVD;
+      return;
+    }
+  } else if (ObjCInterfaceDecl *MD = dyn_cast<ObjCInterfaceDecl>(D)) {
+    RewriteInterfaceDecl(MD);
+  } else if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(D)) {
+    RewriteCategoryDecl(CD);
+  } else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)) {
+    RewriteProtocolDecl(PD);
+  } else if (ObjCForwardProtocolDecl *FP =
+             dyn_cast<ObjCForwardProtocolDecl>(D)){
+    RewriteForwardProtocolDecl(FP);
+  } else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(D)) {
+    // Recurse into linkage specifications
+    for (DeclContext::decl_iterator DI = LSD->decls_begin(),
+                                 DIEnd = LSD->decls_end();
+         DI != DIEnd; ++DI)
+      HandleTopLevelSingleDecl(*DI);
+  }
+  // If we have a decl in the main file, see if we should rewrite it.
+  if (SM->isFromMainFile(Loc))
+    return HandleDeclInMainFile(D);
+}
+
+//===----------------------------------------------------------------------===//
+// Syntactic (non-AST) Rewriting Code
+//===----------------------------------------------------------------------===//
+
+void RewriteObjC::RewriteInclude() {
+  SourceLocation LocStart = SM->getLocForStartOfFile(MainFileID);
+  llvm::StringRef MainBuf = SM->getBufferData(MainFileID);
+  const char *MainBufStart = MainBuf.begin();
+  const char *MainBufEnd = MainBuf.end();
+  size_t ImportLen = strlen("import");
+
+  // Loop over the whole file, looking for includes.
+  for (const char *BufPtr = MainBufStart; BufPtr < MainBufEnd; ++BufPtr) {
+    if (*BufPtr == '#') {
+      if (++BufPtr == MainBufEnd)
+        return;
+      while (*BufPtr == ' ' || *BufPtr == '\t')
+        if (++BufPtr == MainBufEnd)
+          return;
+      if (!strncmp(BufPtr, "import", ImportLen)) {
+        // replace import with include
+        SourceLocation ImportLoc =
+          LocStart.getFileLocWithOffset(BufPtr-MainBufStart);
+        ReplaceText(ImportLoc, ImportLen, "include");
+        BufPtr += ImportLen;
+      }
+    }
+  }
+}
+
+static std::string getIvarAccessString(ObjCIvarDecl *OID) {
+  const ObjCInterfaceDecl *ClassDecl = OID->getContainingInterface();
+  std::string S;
+  S = "((struct ";
+  S += ClassDecl->getIdentifier()->getName();
+  S += "_IMPL *)self)->";
+  S += OID->getName();
+  return S;
+}
+
+void RewriteObjC::RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
+                                          ObjCImplementationDecl *IMD,
+                                          ObjCCategoryImplDecl *CID) {
+  static bool objcGetPropertyDefined = false;
+  static bool objcSetPropertyDefined = false;
+  SourceLocation startLoc = PID->getLocStart();
+  InsertText(startLoc, "// ");
+  const char *startBuf = SM->getCharacterData(startLoc);
+  assert((*startBuf == '@') && "bogus @synthesize location");
+  const char *semiBuf = strchr(startBuf, ';');
+  assert((*semiBuf == ';') && "@synthesize: can't find ';'");
+  SourceLocation onePastSemiLoc =
+    startLoc.getFileLocWithOffset(semiBuf-startBuf+1);
+
+  if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
+    return; // FIXME: is this correct?
+
+  // Generate the 'getter' function.
+  ObjCPropertyDecl *PD = PID->getPropertyDecl();
+  ObjCIvarDecl *OID = PID->getPropertyIvarDecl();
+
+  if (!OID)
+    return;
+  unsigned Attributes = PD->getPropertyAttributes();
+  if (!PD->getGetterMethodDecl()->isDefined()) {
+    bool GenGetProperty = !(Attributes & ObjCPropertyDecl::OBJC_PR_nonatomic) &&
+                          (Attributes & (ObjCPropertyDecl::OBJC_PR_retain | 
+                                         ObjCPropertyDecl::OBJC_PR_copy));
+    std::string Getr;
+    if (GenGetProperty && !objcGetPropertyDefined) {
+      objcGetPropertyDefined = true;
+      // FIXME. Is this attribute correct in all cases?
+      Getr = "\nextern \"C\" __declspec(dllimport) "
+            "id objc_getProperty(id, SEL, long, bool);\n";
+    }
+    RewriteObjCMethodDecl(OID->getContainingInterface(),  
+                          PD->getGetterMethodDecl(), Getr);
+    Getr += "{ ";
+    // Synthesize an explicit cast to gain access to the ivar.
+    // See objc-act.c:objc_synthesize_new_getter() for details.
+    if (GenGetProperty) {
+      // return objc_getProperty(self, _cmd, offsetof(ClassDecl, OID), 1)
+      Getr += "typedef ";
+      const FunctionType *FPRetType = 0;
+      RewriteTypeIntoString(PD->getGetterMethodDecl()->getResultType(), Getr, 
+                            FPRetType);
+      Getr += " _TYPE";
+      if (FPRetType) {
+        Getr += ")"; // close the precedence "scope" for "*".
+      
+        // Now, emit the argument types (if any).
+        if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)){
+          Getr += "(";
+          for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) {
+            if (i) Getr += ", ";
+            std::string ParamStr = FT->getArgType(i).getAsString(
+                                                          Context->PrintingPolicy);
+            Getr += ParamStr;
+          }
+          if (FT->isVariadic()) {
+            if (FT->getNumArgs()) Getr += ", ";
+            Getr += "...";
+          }
+          Getr += ")";
+        } else
+          Getr += "()";
+      }
+      Getr += ";\n";
+      Getr += "return (_TYPE)";
+      Getr += "objc_getProperty(self, _cmd, ";
+      SynthesizeIvarOffsetComputation(OID, Getr);
+      Getr += ", 1)";
+    }
+    else
+      Getr += "return " + getIvarAccessString(OID);
+    Getr += "; }";
+    InsertText(onePastSemiLoc, Getr);
+  }
+  
+  if (PD->isReadOnly() || PD->getSetterMethodDecl()->isDefined())
+    return;
+
+  // Generate the 'setter' function.
+  std::string Setr;
+  bool GenSetProperty = Attributes & (ObjCPropertyDecl::OBJC_PR_retain | 
+                                      ObjCPropertyDecl::OBJC_PR_copy);
+  if (GenSetProperty && !objcSetPropertyDefined) {
+    objcSetPropertyDefined = true;
+    // FIXME. Is this attribute correct in all cases?
+    Setr = "\nextern \"C\" __declspec(dllimport) "
+    "void objc_setProperty (id, SEL, long, id, bool, bool);\n";
+  }
+  
+  RewriteObjCMethodDecl(OID->getContainingInterface(), 
+                        PD->getSetterMethodDecl(), Setr);
+  Setr += "{ ";
+  // Synthesize an explicit cast to initialize the ivar.
+  // See objc-act.c:objc_synthesize_new_setter() for details.
+  if (GenSetProperty) {
+    Setr += "objc_setProperty (self, _cmd, ";
+    SynthesizeIvarOffsetComputation(OID, Setr);
+    Setr += ", (id)";
+    Setr += PD->getName();
+    Setr += ", ";
+    if (Attributes & ObjCPropertyDecl::OBJC_PR_nonatomic)
+      Setr += "0, ";
+    else
+      Setr += "1, ";
+    if (Attributes & ObjCPropertyDecl::OBJC_PR_copy)
+      Setr += "1)";
+    else
+      Setr += "0)";
+  }
+  else {
+    Setr += getIvarAccessString(OID) + " = ";
+    Setr += PD->getName();
+  }
+  Setr += "; }";
+  InsertText(onePastSemiLoc, Setr);
+}
+
+void RewriteObjC::RewriteForwardClassDecl(ObjCClassDecl *ClassDecl) {
+  // Get the start location and compute the semi location.
+  SourceLocation startLoc = ClassDecl->getLocation();
+  const char *startBuf = SM->getCharacterData(startLoc);
+  const char *semiPtr = strchr(startBuf, ';');
+
+  // Translate to typedef's that forward reference structs with the same name
+  // as the class. As a convenience, we include the original declaration
+  // as a comment.
+  std::string typedefString;
+  typedefString += "// @class ";
+  for (ObjCClassDecl::iterator I = ClassDecl->begin(), E = ClassDecl->end();
+       I != E; ++I) {
+    ObjCInterfaceDecl *ForwardDecl = I->getInterface();
+    typedefString += ForwardDecl->getNameAsString();
+    if (I+1 != E)
+      typedefString += ", ";
+    else
+      typedefString += ";\n";
+  }
+  
+  for (ObjCClassDecl::iterator I = ClassDecl->begin(), E = ClassDecl->end();
+       I != E; ++I) {
+    ObjCInterfaceDecl *ForwardDecl = I->getInterface();
+    typedefString += "#ifndef _REWRITER_typedef_";
+    typedefString += ForwardDecl->getNameAsString();
+    typedefString += "\n";
+    typedefString += "#define _REWRITER_typedef_";
+    typedefString += ForwardDecl->getNameAsString();
+    typedefString += "\n";
+    typedefString += "typedef struct objc_object ";
+    typedefString += ForwardDecl->getNameAsString();
+    typedefString += ";\n#endif\n";
+  }
+
+  // Replace the @class with typedefs corresponding to the classes.
+  ReplaceText(startLoc, semiPtr-startBuf+1, typedefString);
+}
+
+void RewriteObjC::RewriteMethodDeclaration(ObjCMethodDecl *Method) {
+  // When method is a synthesized one, such as a getter/setter there is
+  // nothing to rewrite.
+  if (Method->isSynthesized())
+    return;
+  SourceLocation LocStart = Method->getLocStart();
+  SourceLocation LocEnd = Method->getLocEnd();
+
+  if (SM->getInstantiationLineNumber(LocEnd) >
+      SM->getInstantiationLineNumber(LocStart)) {
+    InsertText(LocStart, "#if 0\n");
+    ReplaceText(LocEnd, 1, ";\n#endif\n");
+  } else {
+    InsertText(LocStart, "// ");
+  }
+}
+
+void RewriteObjC::RewriteProperty(ObjCPropertyDecl *prop) {
+  SourceLocation Loc = prop->getAtLoc();
+
+  ReplaceText(Loc, 0, "// ");
+  // FIXME: handle properties that are declared across multiple lines.
+}
+
+void RewriteObjC::RewriteCategoryDecl(ObjCCategoryDecl *CatDecl) {
+  SourceLocation LocStart = CatDecl->getLocStart();
+
+  // FIXME: handle category headers that are declared across multiple lines.
+  ReplaceText(LocStart, 0, "// ");
+
+  for (ObjCCategoryDecl::prop_iterator I = CatDecl->prop_begin(),
+       E = CatDecl->prop_end(); I != E; ++I)
+    RewriteProperty(*I);
+  
+  for (ObjCCategoryDecl::instmeth_iterator
+         I = CatDecl->instmeth_begin(), E = CatDecl->instmeth_end();
+       I != E; ++I)
+    RewriteMethodDeclaration(*I);
+  for (ObjCCategoryDecl::classmeth_iterator
+         I = CatDecl->classmeth_begin(), E = CatDecl->classmeth_end();
+       I != E; ++I)
+    RewriteMethodDeclaration(*I);
+
+  // Lastly, comment out the @end.
+  ReplaceText(CatDecl->getAtEndRange().getBegin(), 
+              strlen("@end"), "/* @end */");
+}
+
+void RewriteObjC::RewriteProtocolDecl(ObjCProtocolDecl *PDecl) {
+  SourceLocation LocStart = PDecl->getLocStart();
+
+  // FIXME: handle protocol headers that are declared across multiple lines.
+  ReplaceText(LocStart, 0, "// ");
+
+  for (ObjCProtocolDecl::instmeth_iterator
+         I = PDecl->instmeth_begin(), E = PDecl->instmeth_end();
+       I != E; ++I)
+    RewriteMethodDeclaration(*I);
+  for (ObjCProtocolDecl::classmeth_iterator
+         I = PDecl->classmeth_begin(), E = PDecl->classmeth_end();
+       I != E; ++I)
+    RewriteMethodDeclaration(*I);
+
+  for (ObjCInterfaceDecl::prop_iterator I = PDecl->prop_begin(),
+       E = PDecl->prop_end(); I != E; ++I)
+    RewriteProperty(*I);
+  
+  // Lastly, comment out the @end.
+  SourceLocation LocEnd = PDecl->getAtEndRange().getBegin();
+  ReplaceText(LocEnd, strlen("@end"), "/* @end */");
+
+  // Must comment out @optional/@required
+  const char *startBuf = SM->getCharacterData(LocStart);
+  const char *endBuf = SM->getCharacterData(LocEnd);
+  for (const char *p = startBuf; p < endBuf; p++) {
+    if (*p == '@' && !strncmp(p+1, "optional", strlen("optional"))) {
+      SourceLocation OptionalLoc = LocStart.getFileLocWithOffset(p-startBuf);
+      ReplaceText(OptionalLoc, strlen("@optional"), "/* @optional */");
+
+    }
+    else if (*p == '@' && !strncmp(p+1, "required", strlen("required"))) {
+      SourceLocation OptionalLoc = LocStart.getFileLocWithOffset(p-startBuf);
+      ReplaceText(OptionalLoc, strlen("@required"), "/* @required */");
+
+    }
+  }
+}
+
+void RewriteObjC::RewriteForwardProtocolDecl(ObjCForwardProtocolDecl *PDecl) {
+  SourceLocation LocStart = PDecl->getLocation();
+  if (LocStart.isInvalid())
+    assert(false && "Invalid SourceLocation");
+  // FIXME: handle forward protocol that are declared across multiple lines.
+  ReplaceText(LocStart, 0, "// ");
+}
+
+void RewriteObjC::RewriteTypeIntoString(QualType T, std::string &ResultStr,
+                                        const FunctionType *&FPRetType) {
+  if (T->isObjCQualifiedIdType())
+    ResultStr += "id";
+  else if (T->isFunctionPointerType() ||
+           T->isBlockPointerType()) {
+    // needs special handling, since pointer-to-functions have special
+    // syntax (where a decaration models use).
+    QualType retType = T;
+    QualType PointeeTy;
+    if (const PointerType* PT = retType->getAs<PointerType>())
+      PointeeTy = PT->getPointeeType();
+    else if (const BlockPointerType *BPT = retType->getAs<BlockPointerType>())
+      PointeeTy = BPT->getPointeeType();
+    if ((FPRetType = PointeeTy->getAs<FunctionType>())) {
+      ResultStr += FPRetType->getResultType().getAsString(
+        Context->PrintingPolicy);
+      ResultStr += "(*";
+    }
+  } else
+    ResultStr += T.getAsString(Context->PrintingPolicy);
+}
+
+void RewriteObjC::RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
+                                        ObjCMethodDecl *OMD,
+                                        std::string &ResultStr) {
+  //fprintf(stderr,"In RewriteObjCMethodDecl\n");
+  const FunctionType *FPRetType = 0;
+  ResultStr += "\nstatic ";
+  RewriteTypeIntoString(OMD->getResultType(), ResultStr, FPRetType);
+  ResultStr += " ";
+
+  // Unique method name
+  std::string NameStr;
+
+  if (OMD->isInstanceMethod())
+    NameStr += "_I_";
+  else
+    NameStr += "_C_";
+
+  NameStr += IDecl->getNameAsString();
+  NameStr += "_";
+
+  if (ObjCCategoryImplDecl *CID =
+      dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext())) {
+    NameStr += CID->getNameAsString();
+    NameStr += "_";
+  }
+  // Append selector names, replacing ':' with '_'
+  {
+    std::string selString = OMD->getSelector().getAsString();
+    int len = selString.size();
+    for (int i = 0; i < len; i++)
+      if (selString[i] == ':')
+        selString[i] = '_';
+    NameStr += selString;
+  }
+  // Remember this name for metadata emission
+  MethodInternalNames[OMD] = NameStr;
+  ResultStr += NameStr;
+
+  // Rewrite arguments
+  ResultStr += "(";
+
+  // invisible arguments
+  if (OMD->isInstanceMethod()) {
+    QualType selfTy = Context->getObjCInterfaceType(IDecl);
+    selfTy = Context->getPointerType(selfTy);
+    if (!LangOpts.Microsoft) {
+      if (ObjCSynthesizedStructs.count(const_cast<ObjCInterfaceDecl*>(IDecl)))
+        ResultStr += "struct ";
+    }
+    // When rewriting for Microsoft, explicitly omit the structure name.
+    ResultStr += IDecl->getNameAsString();
+    ResultStr += " *";
+  }
+  else
+    ResultStr += Context->getObjCClassType().getAsString(
+      Context->PrintingPolicy);
+
+  ResultStr += " self, ";
+  ResultStr += Context->getObjCSelType().getAsString(Context->PrintingPolicy);
+  ResultStr += " _cmd";
+
+  // Method arguments.
+  for (ObjCMethodDecl::param_iterator PI = OMD->param_begin(),
+       E = OMD->param_end(); PI != E; ++PI) {
+    ParmVarDecl *PDecl = *PI;
+    ResultStr += ", ";
+    if (PDecl->getType()->isObjCQualifiedIdType()) {
+      ResultStr += "id ";
+      ResultStr += PDecl->getNameAsString();
+    } else {
+      std::string Name = PDecl->getNameAsString();
+      QualType QT = PDecl->getType();
+      // Make sure we convert "t (^)(...)" to "t (*)(...)".
+      if (convertBlockPointerToFunctionPointer(QT))
+        QT.getAsStringInternal(Name, Context->PrintingPolicy);
+      else
+        PDecl->getType().getAsStringInternal(Name, Context->PrintingPolicy);
+      ResultStr += Name;
+    }
+  }
+  if (OMD->isVariadic())
+    ResultStr += ", ...";
+  ResultStr += ") ";
+
+  if (FPRetType) {
+    ResultStr += ")"; // close the precedence "scope" for "*".
+
+    // Now, emit the argument types (if any).
+    if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)) {
+      ResultStr += "(";
+      for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) {
+        if (i) ResultStr += ", ";
+        std::string ParamStr = FT->getArgType(i).getAsString(
+          Context->PrintingPolicy);
+        ResultStr += ParamStr;
+      }
+      if (FT->isVariadic()) {
+        if (FT->getNumArgs()) ResultStr += ", ";
+        ResultStr += "...";
+      }
+      ResultStr += ")";
+    } else {
+      ResultStr += "()";
+    }
+  }
+}
+void RewriteObjC::RewriteImplementationDecl(Decl *OID) {
+  ObjCImplementationDecl *IMD = dyn_cast<ObjCImplementationDecl>(OID);
+  ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(OID);
+
+  InsertText(IMD ? IMD->getLocStart() : CID->getLocStart(), "// ");
+
+  for (ObjCCategoryImplDecl::instmeth_iterator
+       I = IMD ? IMD->instmeth_begin() : CID->instmeth_begin(),
+       E = IMD ? IMD->instmeth_end() : CID->instmeth_end();
+       I != E; ++I) {
+    std::string ResultStr;
+    ObjCMethodDecl *OMD = *I;
+    RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
+    SourceLocation LocStart = OMD->getLocStart();
+    SourceLocation LocEnd = OMD->getCompoundBody()->getLocStart();
+
+    const char *startBuf = SM->getCharacterData(LocStart);
+    const char *endBuf = SM->getCharacterData(LocEnd);
+    ReplaceText(LocStart, endBuf-startBuf, ResultStr);
+  }
+
+  for (ObjCCategoryImplDecl::classmeth_iterator
+       I = IMD ? IMD->classmeth_begin() : CID->classmeth_begin(),
+       E = IMD ? IMD->classmeth_end() : CID->classmeth_end();
+       I != E; ++I) {
+    std::string ResultStr;
+    ObjCMethodDecl *OMD = *I;
+    RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
+    SourceLocation LocStart = OMD->getLocStart();
+    SourceLocation LocEnd = OMD->getCompoundBody()->getLocStart();
+
+    const char *startBuf = SM->getCharacterData(LocStart);
+    const char *endBuf = SM->getCharacterData(LocEnd);
+    ReplaceText(LocStart, endBuf-startBuf, ResultStr);
+  }
+  for (ObjCCategoryImplDecl::propimpl_iterator
+       I = IMD ? IMD->propimpl_begin() : CID->propimpl_begin(),
+       E = IMD ? IMD->propimpl_end() : CID->propimpl_end();
+       I != E; ++I) {
+    RewritePropertyImplDecl(*I, IMD, CID);
+  }
+
+  InsertText(IMD ? IMD->getLocEnd() : CID->getLocEnd(), "// ");
+}
+
+void RewriteObjC::RewriteInterfaceDecl(ObjCInterfaceDecl *ClassDecl) {
+  std::string ResultStr;
+  if (!ObjCForwardDecls.count(ClassDecl)) {
+    // we haven't seen a forward decl - generate a typedef.
+    ResultStr = "#ifndef _REWRITER_typedef_";
+    ResultStr += ClassDecl->getNameAsString();
+    ResultStr += "\n";
+    ResultStr += "#define _REWRITER_typedef_";
+    ResultStr += ClassDecl->getNameAsString();
+    ResultStr += "\n";
+    ResultStr += "typedef struct objc_object ";
+    ResultStr += ClassDecl->getNameAsString();
+    ResultStr += ";\n#endif\n";
+    // Mark this typedef as having been generated.
+    ObjCForwardDecls.insert(ClassDecl);
+  }
+  SynthesizeObjCInternalStruct(ClassDecl, ResultStr);
+
+  for (ObjCInterfaceDecl::prop_iterator I = ClassDecl->prop_begin(),
+         E = ClassDecl->prop_end(); I != E; ++I)
+    RewriteProperty(*I);
+  for (ObjCInterfaceDecl::instmeth_iterator
+         I = ClassDecl->instmeth_begin(), E = ClassDecl->instmeth_end();
+       I != E; ++I)
+    RewriteMethodDeclaration(*I);
+  for (ObjCInterfaceDecl::classmeth_iterator
+         I = ClassDecl->classmeth_begin(), E = ClassDecl->classmeth_end();
+       I != E; ++I)
+    RewriteMethodDeclaration(*I);
+
+  // Lastly, comment out the @end.
+  ReplaceText(ClassDecl->getAtEndRange().getBegin(), strlen("@end"), 
+              "/* @end */");
+}
+
+Stmt *RewriteObjC::RewritePropertyOrImplicitSetter(BinaryOperator *BinOp, Expr *newStmt,
+                                         SourceRange SrcRange) {
+  ObjCMethodDecl *OMD = 0;
+  QualType Ty;
+  Selector Sel;
+  Stmt *Receiver = 0;
+  bool Super = false;
+  QualType SuperTy;
+  SourceLocation SuperLocation;
+  SourceLocation SelectorLoc;
+  // Synthesize a ObjCMessageExpr from a ObjCPropertyRefExpr or ObjCImplicitSetterGetterRefExpr.
+  // This allows us to reuse all the fun and games in SynthMessageExpr().
+  if (ObjCPropertyRefExpr *PropRefExpr =
+        dyn_cast<ObjCPropertyRefExpr>(BinOp->getLHS())) {
+    SelectorLoc = PropRefExpr->getLocation();
+    if (PropRefExpr->isExplicitProperty()) {
+      ObjCPropertyDecl *PDecl = PropRefExpr->getExplicitProperty();
+      OMD = PDecl->getSetterMethodDecl();
+      Ty = PDecl->getType();
+      Sel = PDecl->getSetterName();
+    } else {
+      OMD = PropRefExpr->getImplicitPropertySetter();
+      Sel = OMD->getSelector();
+      Ty = PropRefExpr->getType();
+    }
+    Super = PropRefExpr->isSuperReceiver();
+    if (!Super) {
+      Receiver = PropRefExpr->getBase();
+    } else {
+      SuperTy = PropRefExpr->getSuperReceiverType();
+      SuperLocation = PropRefExpr->getReceiverLocation();
+    }
+  }
+  
+  assert(OMD && "RewritePropertyOrImplicitSetter - null OMD");
+  llvm::SmallVector<Expr *, 1> ExprVec;
+  ExprVec.push_back(newStmt);
+
+  ObjCMessageExpr *MsgExpr;
+  if (Super)
+    MsgExpr = ObjCMessageExpr::Create(*Context, 
+                                      Ty.getNonReferenceType(),
+                                      Expr::getValueKindForType(Ty),
+                                      /*FIXME?*/SourceLocation(),
+                                      SuperLocation,
+                                      /*IsInstanceSuper=*/true,
+                                      SuperTy,
+                                      Sel, SelectorLoc, OMD,
+                                      &ExprVec[0], 1,
+                                      /*FIXME:*/SourceLocation());
+  else {
+    // FIXME. Refactor this into common code with that in 
+    // RewritePropertyOrImplicitGetter
+    assert(Receiver && "RewritePropertyOrImplicitSetter - null Receiver");
+    if (Expr *Exp = dyn_cast<Expr>(Receiver))
+      if (PropGetters[Exp])
+        // This allows us to handle chain/nested property/implicit getters.
+        Receiver = PropGetters[Exp];
+  
+    MsgExpr = ObjCMessageExpr::Create(*Context, 
+                                      Ty.getNonReferenceType(),
+                                      Expr::getValueKindForType(Ty),
+                                      /*FIXME: */SourceLocation(),
+                                      cast<Expr>(Receiver),
+                                      Sel, SelectorLoc, OMD,
+                                      &ExprVec[0], 1,
+                                      /*FIXME:*/SourceLocation());
+  }
+  Stmt *ReplacingStmt = SynthMessageExpr(MsgExpr);
+
+  // Now do the actual rewrite.
+  ReplaceStmtWithRange(BinOp, ReplacingStmt, SrcRange);
+  //delete BinOp;
+  // NOTE: We don't want to call MsgExpr->Destroy(), as it holds references
+  // to things that stay around.
+  Context->Deallocate(MsgExpr);
+  return ReplacingStmt;
+}
+
+Stmt *RewriteObjC::RewritePropertyOrImplicitGetter(Expr *PropOrGetterRefExpr) {
+  // Synthesize a ObjCMessageExpr from a ObjCPropertyRefExpr or ImplicitGetter.
+  // This allows us to reuse all the fun and games in SynthMessageExpr().
+  Stmt *Receiver = 0;
+  ObjCMethodDecl *OMD = 0;
+  QualType Ty;
+  Selector Sel;
+  bool Super = false;
+  QualType SuperTy;
+  SourceLocation SuperLocation;
+  SourceLocation SelectorLoc;
+  if (ObjCPropertyRefExpr *PropRefExpr = 
+        dyn_cast<ObjCPropertyRefExpr>(PropOrGetterRefExpr)) {
+    SelectorLoc = PropRefExpr->getLocation();
+    if (PropRefExpr->isExplicitProperty()) {
+      ObjCPropertyDecl *PDecl = PropRefExpr->getExplicitProperty();
+      OMD = PDecl->getGetterMethodDecl();
+      Ty = PDecl->getType();
+      Sel = PDecl->getGetterName();
+    } else {
+      OMD = PropRefExpr->getImplicitPropertyGetter();
+      Sel = OMD->getSelector();
+      Ty = PropRefExpr->getType();
+    }
+    Super = PropRefExpr->isSuperReceiver();
+    if (!Super)
+      Receiver = PropRefExpr->getBase();
+    else {
+      SuperTy = PropRefExpr->getSuperReceiverType();
+      SuperLocation = PropRefExpr->getReceiverLocation();
+    }
+  }
+  
+  assert (OMD && "RewritePropertyOrImplicitGetter - OMD is null");
+  
+  ObjCMessageExpr *MsgExpr;
+  if (Super)
+    MsgExpr = ObjCMessageExpr::Create(*Context, 
+                                      Ty.getNonReferenceType(),
+                                      Expr::getValueKindForType(Ty),
+                                      PropOrGetterRefExpr->getLocStart(),
+                                      SuperLocation,
+                                      /*IsInstanceSuper=*/true,
+                                      SuperTy,
+                                      Sel, SelectorLoc, OMD,
+                                      0, 0, 
+                                      PropOrGetterRefExpr->getLocEnd());
+  else {
+    assert (Receiver && "RewritePropertyOrImplicitGetter - Receiver is null");
+    if (Expr *Exp = dyn_cast<Expr>(Receiver))
+      if (PropGetters[Exp])
+        // This allows us to handle chain/nested property/implicit getters.
+        Receiver = PropGetters[Exp];
+    MsgExpr = ObjCMessageExpr::Create(*Context, 
+                                      Ty.getNonReferenceType(),
+                                      Expr::getValueKindForType(Ty),
+                                      PropOrGetterRefExpr->getLocStart(),
+                                      cast<Expr>(Receiver),
+                                      Sel, SelectorLoc, OMD,
+                                      0, 0, 
+                                      PropOrGetterRefExpr->getLocEnd());
+  }
+
+  Stmt *ReplacingStmt = SynthMessageExpr(MsgExpr, MsgExpr->getLocStart(),
+                                         MsgExpr->getLocEnd());
+
+  if (!PropParentMap)
+    PropParentMap = new ParentMap(CurrentBody);
+  bool NestedPropertyRef = false;
+  Stmt *Parent = PropParentMap->getParent(PropOrGetterRefExpr);
+  ImplicitCastExpr*ICE=0;
+  if (Parent)
+    if ((ICE = dyn_cast<ImplicitCastExpr>(Parent))) {
+      assert((ICE->getCastKind() == CK_GetObjCProperty)
+             && "RewritePropertyOrImplicitGetter");
+      Parent = PropParentMap->getParent(Parent);
+      NestedPropertyRef = (Parent && isa<ObjCPropertyRefExpr>(Parent));
+    }
+  if (NestedPropertyRef) {
+    // We stash away the ReplacingStmt since actually doing the
+    // replacement/rewrite won't work for nested getters (e.g. obj.p.i)
+    PropGetters[ICE] = ReplacingStmt;
+    // NOTE: We don't want to call MsgExpr->Destroy(), as it holds references
+    // to things that stay around.
+    Context->Deallocate(MsgExpr);
+    return PropOrGetterRefExpr; // return the original...
+  } else {
+    ReplaceStmt(PropOrGetterRefExpr, ReplacingStmt);
+    // delete PropRefExpr; elsewhere...
+    // NOTE: We don't want to call MsgExpr->Destroy(), as it holds references
+    // to things that stay around.
+    Context->Deallocate(MsgExpr);
+    return ReplacingStmt;
+  }
+}
+
+Stmt *RewriteObjC::RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV,
+                                          SourceLocation OrigStart,
+                                          bool &replaced) {
+  ObjCIvarDecl *D = IV->getDecl();
+  const Expr *BaseExpr = IV->getBase();
+  if (CurMethodDef) {
+    if (BaseExpr->getType()->isObjCObjectPointerType()) {
+      const ObjCInterfaceType *iFaceDecl =
+        dyn_cast<ObjCInterfaceType>(BaseExpr->getType()->getPointeeType());
+      assert(iFaceDecl && "RewriteObjCIvarRefExpr - iFaceDecl is null");
+      // lookup which class implements the instance variable.
+      ObjCInterfaceDecl *clsDeclared = 0;
+      iFaceDecl->getDecl()->lookupInstanceVariable(D->getIdentifier(),
+                                                   clsDeclared);
+      assert(clsDeclared && "RewriteObjCIvarRefExpr(): Can't find class");
+
+      // Synthesize an explicit cast to gain access to the ivar.
+      std::string RecName = clsDeclared->getIdentifier()->getName();
+      RecName += "_IMPL";
+      IdentifierInfo *II = &Context->Idents.get(RecName);
+      RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                          SourceLocation(), SourceLocation(),
+                                          II);
+      assert(RD && "RewriteObjCIvarRefExpr(): Can't find RecordDecl");
+      QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
+      CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, castT,
+                                                    CK_BitCast,
+                                                    IV->getBase());
+      // Don't forget the parens to enforce the proper binding.
+      ParenExpr *PE = new (Context) ParenExpr(IV->getBase()->getLocStart(),
+                                              IV->getBase()->getLocEnd(),
+                                              castExpr);
+      replaced = true;
+      if (IV->isFreeIvar() &&
+          CurMethodDef->getClassInterface() == iFaceDecl->getDecl()) {
+        MemberExpr *ME = new (Context) MemberExpr(PE, true, D,
+                                                  IV->getLocation(),
+                                                  D->getType(),
+                                                  VK_LValue, OK_Ordinary);
+        // delete IV; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+        return ME;
+      }
+      // Get the new text
+      // Cannot delete IV->getBase(), since PE points to it.
+      // Replace the old base with the cast. This is important when doing
+      // embedded rewrites. For example, [newInv->_container addObject:0].
+      IV->setBase(PE);
+      return IV;
+    }
+  } else { // we are outside a method.
+    assert(!IV->isFreeIvar() && "Cannot have a free standing ivar outside a method");
+
+    // Explicit ivar refs need to have a cast inserted.
+    // FIXME: consider sharing some of this code with the code above.
+    if (BaseExpr->getType()->isObjCObjectPointerType()) {
+      const ObjCInterfaceType *iFaceDecl =
+        dyn_cast<ObjCInterfaceType>(BaseExpr->getType()->getPointeeType());
+      // lookup which class implements the instance variable.
+      ObjCInterfaceDecl *clsDeclared = 0;
+      iFaceDecl->getDecl()->lookupInstanceVariable(D->getIdentifier(),
+                                                   clsDeclared);
+      assert(clsDeclared && "RewriteObjCIvarRefExpr(): Can't find class");
+
+      // Synthesize an explicit cast to gain access to the ivar.
+      std::string RecName = clsDeclared->getIdentifier()->getName();
+      RecName += "_IMPL";
+      IdentifierInfo *II = &Context->Idents.get(RecName);
+      RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                          SourceLocation(), SourceLocation(),
+                                          II);
+      assert(RD && "RewriteObjCIvarRefExpr(): Can't find RecordDecl");
+      QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
+      CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, castT,
+                                                    CK_BitCast,
+                                                    IV->getBase());
+      // Don't forget the parens to enforce the proper binding.
+      ParenExpr *PE = new (Context) ParenExpr(IV->getBase()->getLocStart(),
+                                    IV->getBase()->getLocEnd(), castExpr);
+      replaced = true;
+      // Cannot delete IV->getBase(), since PE points to it.
+      // Replace the old base with the cast. This is important when doing
+      // embedded rewrites. For example, [newInv->_container addObject:0].
+      IV->setBase(PE);
+      return IV;
+    }
+  }
+  return IV;
+}
+
+Stmt *RewriteObjC::RewriteObjCNestedIvarRefExpr(Stmt *S, bool &replaced) {
+  for (Stmt::child_range CI = S->children(); CI; ++CI) {
+    if (*CI) {
+      Stmt *newStmt = RewriteObjCNestedIvarRefExpr(*CI, replaced);
+      if (newStmt)
+        *CI = newStmt;
+    }
+  }
+  if (ObjCIvarRefExpr *IvarRefExpr = dyn_cast<ObjCIvarRefExpr>(S)) {
+    SourceRange OrigStmtRange = S->getSourceRange();
+    Stmt *newStmt = RewriteObjCIvarRefExpr(IvarRefExpr, OrigStmtRange.getBegin(),
+                                           replaced);
+    return newStmt;
+  } 
+  if (ObjCMessageExpr *MsgRefExpr = dyn_cast<ObjCMessageExpr>(S)) {
+    Stmt *newStmt = SynthMessageExpr(MsgRefExpr);
+    return newStmt;
+  }
+  return S;
+}
+
+/// SynthCountByEnumWithState - To print:
+/// ((unsigned int (*)
+///  (id, SEL, struct __objcFastEnumerationState *, id *, unsigned int))
+///  (void *)objc_msgSend)((id)l_collection,
+///                        sel_registerName(
+///                          "countByEnumeratingWithState:objects:count:"),
+///                        &enumState,
+///                        (id *)items, (unsigned int)16)
+///
+void RewriteObjC::SynthCountByEnumWithState(std::string &buf) {
+  buf += "((unsigned int (*) (id, SEL, struct __objcFastEnumerationState *, "
+  "id *, unsigned int))(void *)objc_msgSend)";
+  buf += "\n\t\t";
+  buf += "((id)l_collection,\n\t\t";
+  buf += "sel_registerName(\"countByEnumeratingWithState:objects:count:\"),";
+  buf += "\n\t\t";
+  buf += "&enumState, "
+         "(id *)items, (unsigned int)16)";
+}
+
+/// RewriteBreakStmt - Rewrite for a break-stmt inside an ObjC2's foreach
+/// statement to exit to its outer synthesized loop.
+///
+Stmt *RewriteObjC::RewriteBreakStmt(BreakStmt *S) {
+  if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
+    return S;
+  // replace break with goto __break_label
+  std::string buf;
+
+  SourceLocation startLoc = S->getLocStart();
+  buf = "goto __break_label_";
+  buf += utostr(ObjCBcLabelNo.back());
+  ReplaceText(startLoc, strlen("break"), buf);
+
+  return 0;
+}
+
+/// RewriteContinueStmt - Rewrite for a continue-stmt inside an ObjC2's foreach
+/// statement to continue with its inner synthesized loop.
+///
+Stmt *RewriteObjC::RewriteContinueStmt(ContinueStmt *S) {
+  if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
+    return S;
+  // replace continue with goto __continue_label
+  std::string buf;
+
+  SourceLocation startLoc = S->getLocStart();
+  buf = "goto __continue_label_";
+  buf += utostr(ObjCBcLabelNo.back());
+  ReplaceText(startLoc, strlen("continue"), buf);
+
+  return 0;
+}
+
+/// RewriteObjCForCollectionStmt - Rewriter for ObjC2's foreach statement.
+///  It rewrites:
+/// for ( type elem in collection) { stmts; }
+
+/// Into:
+/// {
+///   type elem;
+///   struct __objcFastEnumerationState enumState = { 0 };
+///   id items[16];
+///   id l_collection = (id)collection;
+///   unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
+///                                       objects:items count:16];
+/// if (limit) {
+///   unsigned long startMutations = *enumState.mutationsPtr;
+///   do {
+///        unsigned long counter = 0;
+///        do {
+///             if (startMutations != *enumState.mutationsPtr)
+///               objc_enumerationMutation(l_collection);
+///             elem = (type)enumState.itemsPtr[counter++];
+///             stmts;
+///             __continue_label: ;
+///        } while (counter < limit);
+///   } while (limit = [l_collection countByEnumeratingWithState:&enumState
+///                                  objects:items count:16]);
+///   elem = nil;
+///   __break_label: ;
+///  }
+///  else
+///       elem = nil;
+///  }
+///
+Stmt *RewriteObjC::RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
+                                                SourceLocation OrigEnd) {
+  assert(!Stmts.empty() && "ObjCForCollectionStmt - Statement stack empty");
+  assert(isa<ObjCForCollectionStmt>(Stmts.back()) &&
+         "ObjCForCollectionStmt Statement stack mismatch");
+  assert(!ObjCBcLabelNo.empty() &&
+         "ObjCForCollectionStmt - Label No stack empty");
+
+  SourceLocation startLoc = S->getLocStart();
+  const char *startBuf = SM->getCharacterData(startLoc);
+  llvm::StringRef elementName;
+  std::string elementTypeAsString;
+  std::string buf;
+  buf = "\n{\n\t";
+  if (DeclStmt *DS = dyn_cast<DeclStmt>(S->getElement())) {
+    // type elem;
+    NamedDecl* D = cast<NamedDecl>(DS->getSingleDecl());
+    QualType ElementType = cast<ValueDecl>(D)->getType();
+    if (ElementType->isObjCQualifiedIdType() ||
+        ElementType->isObjCQualifiedInterfaceType())
+      // Simply use 'id' for all qualified types.
+      elementTypeAsString = "id";
+    else
+      elementTypeAsString = ElementType.getAsString(Context->PrintingPolicy);
+    buf += elementTypeAsString;
+    buf += " ";
+    elementName = D->getName();
+    buf += elementName;
+    buf += ";\n\t";
+  }
+  else {
+    DeclRefExpr *DR = cast<DeclRefExpr>(S->getElement());
+    elementName = DR->getDecl()->getName();
+    ValueDecl *VD = cast<ValueDecl>(DR->getDecl());
+    if (VD->getType()->isObjCQualifiedIdType() ||
+        VD->getType()->isObjCQualifiedInterfaceType())
+      // Simply use 'id' for all qualified types.
+      elementTypeAsString = "id";
+    else
+      elementTypeAsString = VD->getType().getAsString(Context->PrintingPolicy);
+  }
+
+  // struct __objcFastEnumerationState enumState = { 0 };
+  buf += "struct __objcFastEnumerationState enumState = { 0 };\n\t";
+  // id items[16];
+  buf += "id items[16];\n\t";
+  // id l_collection = (id)
+  buf += "id l_collection = (id)";
+  // Find start location of 'collection' the hard way!
+  const char *startCollectionBuf = startBuf;
+  startCollectionBuf += 3;  // skip 'for'
+  startCollectionBuf = strchr(startCollectionBuf, '(');
+  startCollectionBuf++; // skip '('
+  // find 'in' and skip it.
+  while (*startCollectionBuf != ' ' ||
+         *(startCollectionBuf+1) != 'i' || *(startCollectionBuf+2) != 'n' ||
+         (*(startCollectionBuf+3) != ' ' &&
+          *(startCollectionBuf+3) != '[' && *(startCollectionBuf+3) != '('))
+    startCollectionBuf++;
+  startCollectionBuf += 3;
+
+  // Replace: "for (type element in" with string constructed thus far.
+  ReplaceText(startLoc, startCollectionBuf - startBuf, buf);
+  // Replace ')' in for '(' type elem in collection ')' with ';'
+  SourceLocation rightParenLoc = S->getRParenLoc();
+  const char *rparenBuf = SM->getCharacterData(rightParenLoc);
+  SourceLocation lparenLoc = startLoc.getFileLocWithOffset(rparenBuf-startBuf);
+  buf = ";\n\t";
+
+  // unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
+  //                                   objects:items count:16];
+  // which is synthesized into:
+  // unsigned int limit =
+  // ((unsigned int (*)
+  //  (id, SEL, struct __objcFastEnumerationState *, id *, unsigned int))
+  //  (void *)objc_msgSend)((id)l_collection,
+  //                        sel_registerName(
+  //                          "countByEnumeratingWithState:objects:count:"),
+  //                        (struct __objcFastEnumerationState *)&state,
+  //                        (id *)items, (unsigned int)16);
+  buf += "unsigned long limit =\n\t\t";
+  SynthCountByEnumWithState(buf);
+  buf += ";\n\t";
+  /// if (limit) {
+  ///   unsigned long startMutations = *enumState.mutationsPtr;
+  ///   do {
+  ///        unsigned long counter = 0;
+  ///        do {
+  ///             if (startMutations != *enumState.mutationsPtr)
+  ///               objc_enumerationMutation(l_collection);
+  ///             elem = (type)enumState.itemsPtr[counter++];
+  buf += "if (limit) {\n\t";
+  buf += "unsigned long startMutations = *enumState.mutationsPtr;\n\t";
+  buf += "do {\n\t\t";
+  buf += "unsigned long counter = 0;\n\t\t";
+  buf += "do {\n\t\t\t";
+  buf += "if (startMutations != *enumState.mutationsPtr)\n\t\t\t\t";
+  buf += "objc_enumerationMutation(l_collection);\n\t\t\t";
+  buf += elementName;
+  buf += " = (";
+  buf += elementTypeAsString;
+  buf += ")enumState.itemsPtr[counter++];";
+  // Replace ')' in for '(' type elem in collection ')' with all of these.
+  ReplaceText(lparenLoc, 1, buf);
+
+  ///            __continue_label: ;
+  ///        } while (counter < limit);
+  ///   } while (limit = [l_collection countByEnumeratingWithState:&enumState
+  ///                                  objects:items count:16]);
+  ///   elem = nil;
+  ///   __break_label: ;
+  ///  }
+  ///  else
+  ///       elem = nil;
+  ///  }
+  ///
+  buf = ";\n\t";
+  buf += "__continue_label_";
+  buf += utostr(ObjCBcLabelNo.back());
+  buf += ": ;";
+  buf += "\n\t\t";
+  buf += "} while (counter < limit);\n\t";
+  buf += "} while (limit = ";
+  SynthCountByEnumWithState(buf);
+  buf += ");\n\t";
+  buf += elementName;
+  buf += " = ((";
+  buf += elementTypeAsString;
+  buf += ")0);\n\t";
+  buf += "__break_label_";
+  buf += utostr(ObjCBcLabelNo.back());
+  buf += ": ;\n\t";
+  buf += "}\n\t";
+  buf += "else\n\t\t";
+  buf += elementName;
+  buf += " = ((";
+  buf += elementTypeAsString;
+  buf += ")0);\n\t";
+  buf += "}\n";
+
+  // Insert all these *after* the statement body.
+  // FIXME: If this should support Obj-C++, support CXXTryStmt
+  if (isa<CompoundStmt>(S->getBody())) {
+    SourceLocation endBodyLoc = OrigEnd.getFileLocWithOffset(1);
+    InsertText(endBodyLoc, buf);
+  } else {
+    /* Need to treat single statements specially. For example:
+     *
+     *     for (A *a in b) if (stuff()) break;
+     *     for (A *a in b) xxxyy;
+     *
+     * The following code simply scans ahead to the semi to find the actual end.
+     */
+    const char *stmtBuf = SM->getCharacterData(OrigEnd);
+    const char *semiBuf = strchr(stmtBuf, ';');
+    assert(semiBuf && "Can't find ';'");
+    SourceLocation endBodyLoc = OrigEnd.getFileLocWithOffset(semiBuf-stmtBuf+1);
+    InsertText(endBodyLoc, buf);
+  }
+  Stmts.pop_back();
+  ObjCBcLabelNo.pop_back();
+  return 0;
+}
+
+/// RewriteObjCSynchronizedStmt -
+/// This routine rewrites @synchronized(expr) stmt;
+/// into:
+/// objc_sync_enter(expr);
+/// @try stmt @finally { objc_sync_exit(expr); }
+///
+Stmt *RewriteObjC::RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S) {
+  // Get the start location and compute the semi location.
+  SourceLocation startLoc = S->getLocStart();
+  const char *startBuf = SM->getCharacterData(startLoc);
+
+  assert((*startBuf == '@') && "bogus @synchronized location");
+
+  std::string buf;
+  buf = "objc_sync_enter((id)";
+  const char *lparenBuf = startBuf;
+  while (*lparenBuf != '(') lparenBuf++;
+  ReplaceText(startLoc, lparenBuf-startBuf+1, buf);
+  // We can't use S->getSynchExpr()->getLocEnd() to find the end location, since
+  // the sync expression is typically a message expression that's already
+  // been rewritten! (which implies the SourceLocation's are invalid).
+  SourceLocation endLoc = S->getSynchBody()->getLocStart();
+  const char *endBuf = SM->getCharacterData(endLoc);
+  while (*endBuf != ')') endBuf--;
+  SourceLocation rparenLoc = startLoc.getFileLocWithOffset(endBuf-startBuf);
+  buf = ");\n";
+  // declare a new scope with two variables, _stack and _rethrow.
+  buf += "/* @try scope begin */ \n{ struct _objc_exception_data {\n";
+  buf += "int buf[18/*32-bit i386*/];\n";
+  buf += "char *pointers[4];} _stack;\n";
+  buf += "id volatile _rethrow = 0;\n";
+  buf += "objc_exception_try_enter(&_stack);\n";
+  buf += "if (!_setjmp(_stack.buf)) /* @try block continue */\n";
+  ReplaceText(rparenLoc, 1, buf);
+  startLoc = S->getSynchBody()->getLocEnd();
+  startBuf = SM->getCharacterData(startLoc);
+
+  assert((*startBuf == '}') && "bogus @synchronized block");
+  SourceLocation lastCurlyLoc = startLoc;
+  buf = "}\nelse {\n";
+  buf += "  _rethrow = objc_exception_extract(&_stack);\n";
+  buf += "}\n";
+  buf += "{ /* implicit finally clause */\n";
+  buf += "  if (!_rethrow) objc_exception_try_exit(&_stack);\n";
+  
+  std::string syncBuf;
+  syncBuf += " objc_sync_exit(";
+  Expr *syncExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
+                                            CK_BitCast,
+                                            S->getSynchExpr());
+  std::string syncExprBufS;
+  llvm::raw_string_ostream syncExprBuf(syncExprBufS);
+  syncExpr->printPretty(syncExprBuf, *Context, 0,
+                        PrintingPolicy(LangOpts));
+  syncBuf += syncExprBuf.str();
+  syncBuf += ");";
+  
+  buf += syncBuf;
+  buf += "\n  if (_rethrow) objc_exception_throw(_rethrow);\n";
+  buf += "}\n";
+  buf += "}";
+
+  ReplaceText(lastCurlyLoc, 1, buf);
+
+  bool hasReturns = false;
+  HasReturnStmts(S->getSynchBody(), hasReturns);
+  if (hasReturns)
+    RewriteSyncReturnStmts(S->getSynchBody(), syncBuf);
+
+  return 0;
+}
+
+void RewriteObjC::WarnAboutReturnGotoStmts(Stmt *S)
+{
+  // Perform a bottom up traversal of all children.
+  for (Stmt::child_range CI = S->children(); CI; ++CI)
+    if (*CI)
+      WarnAboutReturnGotoStmts(*CI);
+
+  if (isa<ReturnStmt>(S) || isa<GotoStmt>(S)) {
+    Diags.Report(Context->getFullLoc(S->getLocStart()),
+                 TryFinallyContainsReturnDiag);
+  }
+  return;
+}
+
+void RewriteObjC::HasReturnStmts(Stmt *S, bool &hasReturns) 
+{  
+  // Perform a bottom up traversal of all children.
+  for (Stmt::child_range CI = S->children(); CI; ++CI)
+   if (*CI)
+     HasReturnStmts(*CI, hasReturns);
+
+ if (isa<ReturnStmt>(S))
+   hasReturns = true;
+ return;
+}
+
+void RewriteObjC::RewriteTryReturnStmts(Stmt *S) {
+ // Perform a bottom up traversal of all children.
+ for (Stmt::child_range CI = S->children(); CI; ++CI)
+   if (*CI) {
+     RewriteTryReturnStmts(*CI);
+   }
+ if (isa<ReturnStmt>(S)) {
+   SourceLocation startLoc = S->getLocStart();
+   const char *startBuf = SM->getCharacterData(startLoc);
+
+   const char *semiBuf = strchr(startBuf, ';');
+   assert((*semiBuf == ';') && "RewriteTryReturnStmts: can't find ';'");
+   SourceLocation onePastSemiLoc = startLoc.getFileLocWithOffset(semiBuf-startBuf+1);
+
+   std::string buf;
+   buf = "{ objc_exception_try_exit(&_stack); return";
+   
+   ReplaceText(startLoc, 6, buf);
+   InsertText(onePastSemiLoc, "}");
+ }
+ return;
+}
+
+void RewriteObjC::RewriteSyncReturnStmts(Stmt *S, std::string syncExitBuf) {
+  // Perform a bottom up traversal of all children.
+  for (Stmt::child_range CI = S->children(); CI; ++CI)
+    if (*CI) {
+      RewriteSyncReturnStmts(*CI, syncExitBuf);
+    }
+  if (isa<ReturnStmt>(S)) {
+    SourceLocation startLoc = S->getLocStart();
+    const char *startBuf = SM->getCharacterData(startLoc);
+
+    const char *semiBuf = strchr(startBuf, ';');
+    assert((*semiBuf == ';') && "RewriteSyncReturnStmts: can't find ';'");
+    SourceLocation onePastSemiLoc = startLoc.getFileLocWithOffset(semiBuf-startBuf+1);
+
+    std::string buf;
+    buf = "{ objc_exception_try_exit(&_stack);";
+    buf += syncExitBuf;
+    buf += " return";
+    
+    ReplaceText(startLoc, 6, buf);
+    InsertText(onePastSemiLoc, "}");
+  }
+  return;
+}
+
+Stmt *RewriteObjC::RewriteObjCTryStmt(ObjCAtTryStmt *S) {
+  // Get the start location and compute the semi location.
+  SourceLocation startLoc = S->getLocStart();
+  const char *startBuf = SM->getCharacterData(startLoc);
+
+  assert((*startBuf == '@') && "bogus @try location");
+
+  std::string buf;
+  // declare a new scope with two variables, _stack and _rethrow.
+  buf = "/* @try scope begin */ { struct _objc_exception_data {\n";
+  buf += "int buf[18/*32-bit i386*/];\n";
+  buf += "char *pointers[4];} _stack;\n";
+  buf += "id volatile _rethrow = 0;\n";
+  buf += "objc_exception_try_enter(&_stack);\n";
+  buf += "if (!_setjmp(_stack.buf)) /* @try block continue */\n";
+
+  ReplaceText(startLoc, 4, buf);
+
+  startLoc = S->getTryBody()->getLocEnd();
+  startBuf = SM->getCharacterData(startLoc);
+
+  assert((*startBuf == '}') && "bogus @try block");
+
+  SourceLocation lastCurlyLoc = startLoc;
+  if (S->getNumCatchStmts()) {
+    startLoc = startLoc.getFileLocWithOffset(1);
+    buf = " /* @catch begin */ else {\n";
+    buf += " id _caught = objc_exception_extract(&_stack);\n";
+    buf += " objc_exception_try_enter (&_stack);\n";
+    buf += " if (_setjmp(_stack.buf))\n";
+    buf += "   _rethrow = objc_exception_extract(&_stack);\n";
+    buf += " else { /* @catch continue */";
+
+    InsertText(startLoc, buf);
+  } else { /* no catch list */
+    buf = "}\nelse {\n";
+    buf += "  _rethrow = objc_exception_extract(&_stack);\n";
+    buf += "}";
+    ReplaceText(lastCurlyLoc, 1, buf);
+  }
+  Stmt *lastCatchBody = 0;
+  for (unsigned I = 0, N = S->getNumCatchStmts(); I != N; ++I) {
+    ObjCAtCatchStmt *Catch = S->getCatchStmt(I);
+    VarDecl *catchDecl = Catch->getCatchParamDecl();
+
+    if (I == 0)
+      buf = "if ("; // we are generating code for the first catch clause
+    else
+      buf = "else if (";
+    startLoc = Catch->getLocStart();
+    startBuf = SM->getCharacterData(startLoc);
+
+    assert((*startBuf == '@') && "bogus @catch location");
+
+    const char *lParenLoc = strchr(startBuf, '(');
+
+    if (Catch->hasEllipsis()) {
+      // Now rewrite the body...
+      lastCatchBody = Catch->getCatchBody();
+      SourceLocation bodyLoc = lastCatchBody->getLocStart();
+      const char *bodyBuf = SM->getCharacterData(bodyLoc);
+      assert(*SM->getCharacterData(Catch->getRParenLoc()) == ')' &&
+             "bogus @catch paren location");
+      assert((*bodyBuf == '{') && "bogus @catch body location");
+
+      buf += "1) { id _tmp = _caught;";
+      Rewrite.ReplaceText(startLoc, bodyBuf-startBuf+1, buf);
+    } else if (catchDecl) {
+      QualType t = catchDecl->getType();
+      if (t == Context->getObjCIdType()) {
+        buf += "1) { ";
+        ReplaceText(startLoc, lParenLoc-startBuf+1, buf);
+      } else if (const ObjCObjectPointerType *Ptr =
+                   t->getAs<ObjCObjectPointerType>()) {
+        // Should be a pointer to a class.
+        ObjCInterfaceDecl *IDecl = Ptr->getObjectType()->getInterface();
+        if (IDecl) {
+          buf += "objc_exception_match((struct objc_class *)objc_getClass(\"";
+          buf += IDecl->getNameAsString();
+          buf += "\"), (struct objc_object *)_caught)) { ";
+          ReplaceText(startLoc, lParenLoc-startBuf+1, buf);
+        }
+      }
+      // Now rewrite the body...
+      lastCatchBody = Catch->getCatchBody();
+      SourceLocation rParenLoc = Catch->getRParenLoc();
+      SourceLocation bodyLoc = lastCatchBody->getLocStart();
+      const char *bodyBuf = SM->getCharacterData(bodyLoc);
+      const char *rParenBuf = SM->getCharacterData(rParenLoc);
+      assert((*rParenBuf == ')') && "bogus @catch paren location");
+      assert((*bodyBuf == '{') && "bogus @catch body location");
+
+      // Here we replace ") {" with "= _caught;" (which initializes and
+      // declares the @catch parameter).
+      ReplaceText(rParenLoc, bodyBuf-rParenBuf+1, " = _caught;");
+    } else {
+      assert(false && "@catch rewrite bug");
+    }
+  }
+  // Complete the catch list...
+  if (lastCatchBody) {
+    SourceLocation bodyLoc = lastCatchBody->getLocEnd();
+    assert(*SM->getCharacterData(bodyLoc) == '}' &&
+           "bogus @catch body location");
+
+    // Insert the last (implicit) else clause *before* the right curly brace.
+    bodyLoc = bodyLoc.getFileLocWithOffset(-1);
+    buf = "} /* last catch end */\n";
+    buf += "else {\n";
+    buf += " _rethrow = _caught;\n";
+    buf += " objc_exception_try_exit(&_stack);\n";
+    buf += "} } /* @catch end */\n";
+    if (!S->getFinallyStmt())
+      buf += "}\n";
+    InsertText(bodyLoc, buf);
+
+    // Set lastCurlyLoc
+    lastCurlyLoc = lastCatchBody->getLocEnd();
+  }
+  if (ObjCAtFinallyStmt *finalStmt = S->getFinallyStmt()) {
+    startLoc = finalStmt->getLocStart();
+    startBuf = SM->getCharacterData(startLoc);
+    assert((*startBuf == '@') && "bogus @finally start");
+
+    ReplaceText(startLoc, 8, "/* @finally */");
+
+    Stmt *body = finalStmt->getFinallyBody();
+    SourceLocation startLoc = body->getLocStart();
+    SourceLocation endLoc = body->getLocEnd();
+    assert(*SM->getCharacterData(startLoc) == '{' &&
+           "bogus @finally body location");
+    assert(*SM->getCharacterData(endLoc) == '}' &&
+           "bogus @finally body location");
+
+    startLoc = startLoc.getFileLocWithOffset(1);
+    InsertText(startLoc, " if (!_rethrow) objc_exception_try_exit(&_stack);\n");
+    endLoc = endLoc.getFileLocWithOffset(-1);
+    InsertText(endLoc, " if (_rethrow) objc_exception_throw(_rethrow);\n");
+
+    // Set lastCurlyLoc
+    lastCurlyLoc = body->getLocEnd();
+
+    // Now check for any return/continue/go statements within the @try.
+    WarnAboutReturnGotoStmts(S->getTryBody());
+  } else { /* no finally clause - make sure we synthesize an implicit one */
+    buf = "{ /* implicit finally clause */\n";
+    buf += " if (!_rethrow) objc_exception_try_exit(&_stack);\n";
+    buf += " if (_rethrow) objc_exception_throw(_rethrow);\n";
+    buf += "}";
+    ReplaceText(lastCurlyLoc, 1, buf);
+    
+    // Now check for any return/continue/go statements within the @try.
+    // The implicit finally clause won't called if the @try contains any
+    // jump statements.
+    bool hasReturns = false;
+    HasReturnStmts(S->getTryBody(), hasReturns);
+    if (hasReturns)
+      RewriteTryReturnStmts(S->getTryBody());
+  }
+  // Now emit the final closing curly brace...
+  lastCurlyLoc = lastCurlyLoc.getFileLocWithOffset(1);
+  InsertText(lastCurlyLoc, " } /* @try scope end */\n");
+  return 0;
+}
+
+// This can't be done with ReplaceStmt(S, ThrowExpr), since
+// the throw expression is typically a message expression that's already
+// been rewritten! (which implies the SourceLocation's are invalid).
+Stmt *RewriteObjC::RewriteObjCThrowStmt(ObjCAtThrowStmt *S) {
+  // Get the start location and compute the semi location.
+  SourceLocation startLoc = S->getLocStart();
+  const char *startBuf = SM->getCharacterData(startLoc);
+
+  assert((*startBuf == '@') && "bogus @throw location");
+
+  std::string buf;
+  /* void objc_exception_throw(id) __attribute__((noreturn)); */
+  if (S->getThrowExpr())
+    buf = "objc_exception_throw(";
+  else // add an implicit argument
+    buf = "objc_exception_throw(_caught";
+
+  // handle "@  throw" correctly.
+  const char *wBuf = strchr(startBuf, 'w');
+  assert((*wBuf == 'w') && "@throw: can't find 'w'");
+  ReplaceText(startLoc, wBuf-startBuf+1, buf);
+
+  const char *semiBuf = strchr(startBuf, ';');
+  assert((*semiBuf == ';') && "@throw: can't find ';'");
+  SourceLocation semiLoc = startLoc.getFileLocWithOffset(semiBuf-startBuf);
+  ReplaceText(semiLoc, 1, ");");
+  return 0;
+}
+
+Stmt *RewriteObjC::RewriteAtEncode(ObjCEncodeExpr *Exp) {
+  // Create a new string expression.
+  QualType StrType = Context->getPointerType(Context->CharTy);
+  std::string StrEncoding;
+  Context->getObjCEncodingForType(Exp->getEncodedType(), StrEncoding);
+  Expr *Replacement = StringLiteral::Create(*Context,StrEncoding.c_str(),
+                                            StrEncoding.length(),
+                                            false, false, StrType,
+                                            SourceLocation());
+  ReplaceStmt(Exp, Replacement);
+
+  // Replace this subexpr in the parent.
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return Replacement;
+}
+
+Stmt *RewriteObjC::RewriteAtSelector(ObjCSelectorExpr *Exp) {
+  if (!SelGetUidFunctionDecl)
+    SynthSelGetUidFunctionDecl();
+  assert(SelGetUidFunctionDecl && "Can't find sel_registerName() decl");
+  // Create a call to sel_registerName("selName").
+  llvm::SmallVector<Expr*, 8> SelExprs;
+  QualType argType = Context->getPointerType(Context->CharTy);
+  SelExprs.push_back(StringLiteral::Create(*Context,
+                                       Exp->getSelector().getAsString().c_str(),
+                                       Exp->getSelector().getAsString().size(),
+                                       false, false, argType, 
+                                           SourceLocation()));
+  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
+                                                 &SelExprs[0], SelExprs.size());
+  ReplaceStmt(Exp, SelExp);
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return SelExp;
+}
+
+CallExpr *RewriteObjC::SynthesizeCallToFunctionDecl(
+  FunctionDecl *FD, Expr **args, unsigned nargs, SourceLocation StartLoc,
+                                                    SourceLocation EndLoc) {
+  // Get the type, we will need to reference it in a couple spots.
+  QualType msgSendType = FD->getType();
+
+  // Create a reference to the objc_msgSend() declaration.
+  DeclRefExpr *DRE =
+    new (Context) DeclRefExpr(FD, msgSendType, VK_LValue, SourceLocation());
+
+  // Now, we cast the reference to a pointer to the objc_msgSend type.
+  QualType pToFunc = Context->getPointerType(msgSendType);
+  ImplicitCastExpr *ICE = 
+    ImplicitCastExpr::Create(*Context, pToFunc, CK_FunctionToPointerDecay,
+                             DRE, 0, VK_RValue);
+
+  const FunctionType *FT = msgSendType->getAs<FunctionType>();
+
+  CallExpr *Exp =  
+    new (Context) CallExpr(*Context, ICE, args, nargs, 
+                           FT->getCallResultType(*Context),
+                           VK_RValue, EndLoc);
+  return Exp;
+}
+
+static bool scanForProtocolRefs(const char *startBuf, const char *endBuf,
+                                const char *&startRef, const char *&endRef) {
+  while (startBuf < endBuf) {
+    if (*startBuf == '<')
+      startRef = startBuf; // mark the start.
+    if (*startBuf == '>') {
+      if (startRef && *startRef == '<') {
+        endRef = startBuf; // mark the end.
+        return true;
+      }
+      return false;
+    }
+    startBuf++;
+  }
+  return false;
+}
+
+static void scanToNextArgument(const char *&argRef) {
+  int angle = 0;
+  while (*argRef != ')' && (*argRef != ',' || angle > 0)) {
+    if (*argRef == '<')
+      angle++;
+    else if (*argRef == '>')
+      angle--;
+    argRef++;
+  }
+  assert(angle == 0 && "scanToNextArgument - bad protocol type syntax");
+}
+
+bool RewriteObjC::needToScanForQualifiers(QualType T) {
+  if (T->isObjCQualifiedIdType())
+    return true;
+  if (const PointerType *PT = T->getAs<PointerType>()) {
+    if (PT->getPointeeType()->isObjCQualifiedIdType())
+      return true;
+  }
+  if (T->isObjCObjectPointerType()) {
+    T = T->getPointeeType();
+    return T->isObjCQualifiedInterfaceType();
+  }
+  if (T->isArrayType()) {
+    QualType ElemTy = Context->getBaseElementType(T);
+    return needToScanForQualifiers(ElemTy);
+  }
+  return false;
+}
+
+void RewriteObjC::RewriteObjCQualifiedInterfaceTypes(Expr *E) {
+  QualType Type = E->getType();
+  if (needToScanForQualifiers(Type)) {
+    SourceLocation Loc, EndLoc;
+
+    if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E)) {
+      Loc = ECE->getLParenLoc();
+      EndLoc = ECE->getRParenLoc();
+    } else {
+      Loc = E->getLocStart();
+      EndLoc = E->getLocEnd();
+    }
+    // This will defend against trying to rewrite synthesized expressions.
+    if (Loc.isInvalid() || EndLoc.isInvalid())
+      return;
+
+    const char *startBuf = SM->getCharacterData(Loc);
+    const char *endBuf = SM->getCharacterData(EndLoc);
+    const char *startRef = 0, *endRef = 0;
+    if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
+      // Get the locations of the startRef, endRef.
+      SourceLocation LessLoc = Loc.getFileLocWithOffset(startRef-startBuf);
+      SourceLocation GreaterLoc = Loc.getFileLocWithOffset(endRef-startBuf+1);
+      // Comment out the protocol references.
+      InsertText(LessLoc, "/*");
+      InsertText(GreaterLoc, "*/");
+    }
+  }
+}
+
+void RewriteObjC::RewriteObjCQualifiedInterfaceTypes(Decl *Dcl) {
+  SourceLocation Loc;
+  QualType Type;
+  const FunctionProtoType *proto = 0;
+  if (VarDecl *VD = dyn_cast<VarDecl>(Dcl)) {
+    Loc = VD->getLocation();
+    Type = VD->getType();
+  }
+  else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Dcl)) {
+    Loc = FD->getLocation();
+    // Check for ObjC 'id' and class types that have been adorned with protocol
+    // information (id<p>, C<p>*). The protocol references need to be rewritten!
+    const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
+    assert(funcType && "missing function type");
+    proto = dyn_cast<FunctionProtoType>(funcType);
+    if (!proto)
+      return;
+    Type = proto->getResultType();
+  }
+  else if (FieldDecl *FD = dyn_cast<FieldDecl>(Dcl)) {
+    Loc = FD->getLocation();
+    Type = FD->getType();
+  }
+  else
+    return;
+
+  if (needToScanForQualifiers(Type)) {
+    // Since types are unique, we need to scan the buffer.
+
+    const char *endBuf = SM->getCharacterData(Loc);
+    const char *startBuf = endBuf;
+    while (*startBuf != ';' && *startBuf != '<' && startBuf != MainFileStart)
+      startBuf--; // scan backward (from the decl location) for return type.
+    const char *startRef = 0, *endRef = 0;
+    if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
+      // Get the locations of the startRef, endRef.
+      SourceLocation LessLoc = Loc.getFileLocWithOffset(startRef-endBuf);
+      SourceLocation GreaterLoc = Loc.getFileLocWithOffset(endRef-endBuf+1);
+      // Comment out the protocol references.
+      InsertText(LessLoc, "/*");
+      InsertText(GreaterLoc, "*/");
+    }
+  }
+  if (!proto)
+      return; // most likely, was a variable
+  // Now check arguments.
+  const char *startBuf = SM->getCharacterData(Loc);
+  const char *startFuncBuf = startBuf;
+  for (unsigned i = 0; i < proto->getNumArgs(); i++) {
+    if (needToScanForQualifiers(proto->getArgType(i))) {
+      // Since types are unique, we need to scan the buffer.
+
+      const char *endBuf = startBuf;
+      // scan forward (from the decl location) for argument types.
+      scanToNextArgument(endBuf);
+      const char *startRef = 0, *endRef = 0;
+      if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
+        // Get the locations of the startRef, endRef.
+        SourceLocation LessLoc =
+          Loc.getFileLocWithOffset(startRef-startFuncBuf);
+        SourceLocation GreaterLoc =
+          Loc.getFileLocWithOffset(endRef-startFuncBuf+1);
+        // Comment out the protocol references.
+        InsertText(LessLoc, "/*");
+        InsertText(GreaterLoc, "*/");
+      }
+      startBuf = ++endBuf;
+    }
+    else {
+      // If the function name is derived from a macro expansion, then the
+      // argument buffer will not follow the name. Need to speak with Chris.
+      while (*startBuf && *startBuf != ')' && *startBuf != ',')
+        startBuf++; // scan forward (from the decl location) for argument types.
+      startBuf++;
+    }
+  }
+}
+
+void RewriteObjC::RewriteTypeOfDecl(VarDecl *ND) {
+  QualType QT = ND->getType();
+  const Type* TypePtr = QT->getAs<Type>();
+  if (!isa<TypeOfExprType>(TypePtr))
+    return;
+  while (isa<TypeOfExprType>(TypePtr)) {
+    const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
+    QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
+    TypePtr = QT->getAs<Type>();
+  }
+  // FIXME. This will not work for multiple declarators; as in:
+  // __typeof__(a) b,c,d;
+  std::string TypeAsString(QT.getAsString(Context->PrintingPolicy));
+  SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
+  const char *startBuf = SM->getCharacterData(DeclLoc);
+  if (ND->getInit()) {
+    std::string Name(ND->getNameAsString());
+    TypeAsString += " " + Name + " = ";
+    Expr *E = ND->getInit();
+    SourceLocation startLoc;
+    if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
+      startLoc = ECE->getLParenLoc();
+    else
+      startLoc = E->getLocStart();
+    startLoc = SM->getInstantiationLoc(startLoc);
+    const char *endBuf = SM->getCharacterData(startLoc);
+    ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
+  }
+  else {
+    SourceLocation X = ND->getLocEnd();
+    X = SM->getInstantiationLoc(X);
+    const char *endBuf = SM->getCharacterData(X);
+    ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
+  }
+}
+
+// SynthSelGetUidFunctionDecl - SEL sel_registerName(const char *str);
+void RewriteObjC::SynthSelGetUidFunctionDecl() {
+  IdentifierInfo *SelGetUidIdent = &Context->Idents.get("sel_registerName");
+  llvm::SmallVector<QualType, 16> ArgTys;
+  ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
+  QualType getFuncType =
+    getSimpleFunctionType(Context->getObjCSelType(), &ArgTys[0], ArgTys.size());
+  SelGetUidFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                           SourceLocation(),
+                                           SourceLocation(),
+                                           SelGetUidIdent, getFuncType, 0,
+                                           SC_Extern,
+                                           SC_None, false);
+}
+
+void RewriteObjC::RewriteFunctionDecl(FunctionDecl *FD) {
+  // declared in <objc/objc.h>
+  if (FD->getIdentifier() &&
+      FD->getName() == "sel_registerName") {
+    SelGetUidFunctionDecl = FD;
+    return;
+  }
+  RewriteObjCQualifiedInterfaceTypes(FD);
+}
+
+void RewriteObjC::RewriteBlockPointerType(std::string& Str, QualType Type) {
+  std::string TypeString(Type.getAsString(Context->PrintingPolicy));
+  const char *argPtr = TypeString.c_str();
+  if (!strchr(argPtr, '^')) {
+    Str += TypeString;
+    return;
+  }
+  while (*argPtr) {
+    Str += (*argPtr == '^' ? '*' : *argPtr);
+    argPtr++;
+  }
+}
+
+// FIXME. Consolidate this routine with RewriteBlockPointerType.
+void RewriteObjC::RewriteBlockPointerTypeVariable(std::string& Str,
+                                                  ValueDecl *VD) {
+  QualType Type = VD->getType();
+  std::string TypeString(Type.getAsString(Context->PrintingPolicy));
+  const char *argPtr = TypeString.c_str();
+  int paren = 0;
+  while (*argPtr) {
+    switch (*argPtr) {
+      case '(':
+        Str += *argPtr;
+        paren++;
+        break;
+      case ')':
+        Str += *argPtr;
+        paren--;
+        break;
+      case '^':
+        Str += '*';
+        if (paren == 1)
+          Str += VD->getNameAsString();
+        break;
+      default:
+        Str += *argPtr;
+        break;
+    }
+    argPtr++;
+  }
+}
+
+
+void RewriteObjC::RewriteBlockLiteralFunctionDecl(FunctionDecl *FD) {
+  SourceLocation FunLocStart = FD->getTypeSpecStartLoc();
+  const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
+  const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(funcType);
+  if (!proto)
+    return;
+  QualType Type = proto->getResultType();
+  std::string FdStr = Type.getAsString(Context->PrintingPolicy);
+  FdStr += " ";
+  FdStr += FD->getName();
+  FdStr +=  "(";
+  unsigned numArgs = proto->getNumArgs();
+  for (unsigned i = 0; i < numArgs; i++) {
+    QualType ArgType = proto->getArgType(i);
+    RewriteBlockPointerType(FdStr, ArgType);
+    if (i+1 < numArgs)
+      FdStr += ", ";
+  }
+  FdStr +=  ");\n";
+  InsertText(FunLocStart, FdStr);
+  CurFunctionDeclToDeclareForBlock = 0;
+}
+
+// SynthSuperContructorFunctionDecl - id objc_super(id obj, id super);
+void RewriteObjC::SynthSuperContructorFunctionDecl() {
+  if (SuperContructorFunctionDecl)
+    return;
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("__rw_objc_super");
+  llvm::SmallVector<QualType, 16> ArgTys;
+  QualType argT = Context->getObjCIdType();
+  assert(!argT.isNull() && "Can't find 'id' type");
+  ArgTys.push_back(argT);
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               &ArgTys[0], ArgTys.size());
+  SuperContructorFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                         SourceLocation(),
+                                         SourceLocation(),
+                                         msgSendIdent, msgSendType, 0,
+                                         SC_Extern,
+                                         SC_None, false);
+}
+
+// SynthMsgSendFunctionDecl - id objc_msgSend(id self, SEL op, ...);
+void RewriteObjC::SynthMsgSendFunctionDecl() {
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend");
+  llvm::SmallVector<QualType, 16> ArgTys;
+  QualType argT = Context->getObjCIdType();
+  assert(!argT.isNull() && "Can't find 'id' type");
+  ArgTys.push_back(argT);
+  argT = Context->getObjCSelType();
+  assert(!argT.isNull() && "Can't find 'SEL' type");
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               &ArgTys[0], ArgTys.size(),
+                                               true /*isVariadic*/);
+  MsgSendFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                         SourceLocation(),
+                                         SourceLocation(),
+                                         msgSendIdent, msgSendType, 0,
+                                         SC_Extern,
+                                         SC_None, false);
+}
+
+// SynthMsgSendSuperFunctionDecl - id objc_msgSendSuper(struct objc_super *, SEL op, ...);
+void RewriteObjC::SynthMsgSendSuperFunctionDecl() {
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSendSuper");
+  llvm::SmallVector<QualType, 16> ArgTys;
+  RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                      SourceLocation(), SourceLocation(),
+                                      &Context->Idents.get("objc_super"));
+  QualType argT = Context->getPointerType(Context->getTagDeclType(RD));
+  assert(!argT.isNull() && "Can't build 'struct objc_super *' type");
+  ArgTys.push_back(argT);
+  argT = Context->getObjCSelType();
+  assert(!argT.isNull() && "Can't find 'SEL' type");
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               &ArgTys[0], ArgTys.size(),
+                                               true /*isVariadic*/);
+  MsgSendSuperFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                              SourceLocation(),
+                                              SourceLocation(),
+                                              msgSendIdent, msgSendType, 0,
+                                              SC_Extern,
+                                              SC_None, false);
+}
+
+// SynthMsgSendStretFunctionDecl - id objc_msgSend_stret(id self, SEL op, ...);
+void RewriteObjC::SynthMsgSendStretFunctionDecl() {
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_stret");
+  llvm::SmallVector<QualType, 16> ArgTys;
+  QualType argT = Context->getObjCIdType();
+  assert(!argT.isNull() && "Can't find 'id' type");
+  ArgTys.push_back(argT);
+  argT = Context->getObjCSelType();
+  assert(!argT.isNull() && "Can't find 'SEL' type");
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               &ArgTys[0], ArgTys.size(),
+                                               true /*isVariadic*/);
+  MsgSendStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                         SourceLocation(),
+                                         SourceLocation(),
+                                         msgSendIdent, msgSendType, 0,
+                                         SC_Extern,
+                                         SC_None, false);
+}
+
+// SynthMsgSendSuperStretFunctionDecl -
+// id objc_msgSendSuper_stret(struct objc_super *, SEL op, ...);
+void RewriteObjC::SynthMsgSendSuperStretFunctionDecl() {
+  IdentifierInfo *msgSendIdent =
+    &Context->Idents.get("objc_msgSendSuper_stret");
+  llvm::SmallVector<QualType, 16> ArgTys;
+  RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                      SourceLocation(), SourceLocation(),
+                                      &Context->Idents.get("objc_super"));
+  QualType argT = Context->getPointerType(Context->getTagDeclType(RD));
+  assert(!argT.isNull() && "Can't build 'struct objc_super *' type");
+  ArgTys.push_back(argT);
+  argT = Context->getObjCSelType();
+  assert(!argT.isNull() && "Can't find 'SEL' type");
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               &ArgTys[0], ArgTys.size(),
+                                               true /*isVariadic*/);
+  MsgSendSuperStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                       SourceLocation(),
+                                                       SourceLocation(),
+                                              msgSendIdent, msgSendType, 0,
+                                              SC_Extern,
+                                              SC_None, false);
+}
+
+// SynthMsgSendFpretFunctionDecl - double objc_msgSend_fpret(id self, SEL op, ...);
+void RewriteObjC::SynthMsgSendFpretFunctionDecl() {
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_fpret");
+  llvm::SmallVector<QualType, 16> ArgTys;
+  QualType argT = Context->getObjCIdType();
+  assert(!argT.isNull() && "Can't find 'id' type");
+  ArgTys.push_back(argT);
+  argT = Context->getObjCSelType();
+  assert(!argT.isNull() && "Can't find 'SEL' type");
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->DoubleTy,
+                                               &ArgTys[0], ArgTys.size(),
+                                               true /*isVariadic*/);
+  MsgSendFpretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                              SourceLocation(),
+                                              SourceLocation(),
+                                              msgSendIdent, msgSendType, 0,
+                                              SC_Extern,
+                                              SC_None, false);
+}
+
+// SynthGetClassFunctionDecl - id objc_getClass(const char *name);
+void RewriteObjC::SynthGetClassFunctionDecl() {
+  IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getClass");
+  llvm::SmallVector<QualType, 16> ArgTys;
+  ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
+  QualType getClassType = getSimpleFunctionType(Context->getObjCIdType(),
+                                                &ArgTys[0], ArgTys.size());
+  GetClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                          SourceLocation(),
+                                          SourceLocation(),
+                                          getClassIdent, getClassType, 0,
+                                          SC_Extern,
+                                          SC_None, false);
+}
+
+// SynthGetSuperClassFunctionDecl - Class class_getSuperclass(Class cls);
+void RewriteObjC::SynthGetSuperClassFunctionDecl() {
+  IdentifierInfo *getSuperClassIdent = 
+    &Context->Idents.get("class_getSuperclass");
+  llvm::SmallVector<QualType, 16> ArgTys;
+  ArgTys.push_back(Context->getObjCClassType());
+  QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
+                                                &ArgTys[0], ArgTys.size());
+  GetSuperClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                   SourceLocation(),
+                                                   SourceLocation(),
+                                                   getSuperClassIdent,
+                                                   getClassType, 0,
+                                                   SC_Extern,
+                                                   SC_None,
+                                                   false);
+}
+
+// SynthGetMetaClassFunctionDecl - id objc_getClass(const char *name);
+void RewriteObjC::SynthGetMetaClassFunctionDecl() {
+  IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getMetaClass");
+  llvm::SmallVector<QualType, 16> ArgTys;
+  ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
+  QualType getClassType = getSimpleFunctionType(Context->getObjCIdType(),
+                                                &ArgTys[0], ArgTys.size());
+  GetMetaClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                              SourceLocation(),
+                                              SourceLocation(),
+                                              getClassIdent, getClassType, 0,
+                                              SC_Extern,
+                                              SC_None, false);
+}
+
+Stmt *RewriteObjC::RewriteObjCStringLiteral(ObjCStringLiteral *Exp) {
+  QualType strType = getConstantStringStructType();
+
+  std::string S = "__NSConstantStringImpl_";
+
+  std::string tmpName = InFileName;
+  unsigned i;
+  for (i=0; i < tmpName.length(); i++) {
+    char c = tmpName.at(i);
+    // replace any non alphanumeric characters with '_'.
+    if (!isalpha(c) && (c < '0' || c > '9'))
+      tmpName[i] = '_';
+  }
+  S += tmpName;
+  S += "_";
+  S += utostr(NumObjCStringLiterals++);
+
+  Preamble += "static __NSConstantStringImpl " + S;
+  Preamble += " __attribute__ ((section (\"__DATA, __cfstring\"))) = {__CFConstantStringClassReference,";
+  Preamble += "0x000007c8,"; // utf8_str
+  // The pretty printer for StringLiteral handles escape characters properly.
+  std::string prettyBufS;
+  llvm::raw_string_ostream prettyBuf(prettyBufS);
+  Exp->getString()->printPretty(prettyBuf, *Context, 0,
+                                PrintingPolicy(LangOpts));
+  Preamble += prettyBuf.str();
+  Preamble += ",";
+  Preamble += utostr(Exp->getString()->getByteLength()) + "};\n";
+
+  VarDecl *NewVD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
+                                   SourceLocation(), &Context->Idents.get(S),
+                                   strType, 0, SC_Static, SC_None);
+  DeclRefExpr *DRE = new (Context) DeclRefExpr(NewVD, strType, VK_LValue,
+                                               SourceLocation());
+  Expr *Unop = new (Context) UnaryOperator(DRE, UO_AddrOf,
+                                 Context->getPointerType(DRE->getType()),
+                                           VK_RValue, OK_Ordinary,
+                                           SourceLocation());
+  // cast to NSConstantString *
+  CastExpr *cast = NoTypeInfoCStyleCastExpr(Context, Exp->getType(),
+                                            CK_BitCast, Unop);
+  ReplaceStmt(Exp, cast);
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return cast;
+}
+
+// struct objc_super { struct objc_object *receiver; struct objc_class *super; };
+QualType RewriteObjC::getSuperStructType() {
+  if (!SuperStructDecl) {
+    SuperStructDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                         SourceLocation(), SourceLocation(),
+                                         &Context->Idents.get("objc_super"));
+    QualType FieldTypes[2];
+
+    // struct objc_object *receiver;
+    FieldTypes[0] = Context->getObjCIdType();
+    // struct objc_class *super;
+    FieldTypes[1] = Context->getObjCClassType();
+
+    // Create fields
+    for (unsigned i = 0; i < 2; ++i) {
+      SuperStructDecl->addDecl(FieldDecl::Create(*Context, SuperStructDecl,
+                                                 SourceLocation(),
+                                                 SourceLocation(), 0,
+                                                 FieldTypes[i], 0,
+                                                 /*BitWidth=*/0,
+                                                 /*Mutable=*/false));
+    }
+
+    SuperStructDecl->completeDefinition();
+  }
+  return Context->getTagDeclType(SuperStructDecl);
+}
+
+QualType RewriteObjC::getConstantStringStructType() {
+  if (!ConstantStringDecl) {
+    ConstantStringDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                            SourceLocation(), SourceLocation(),
+                         &Context->Idents.get("__NSConstantStringImpl"));
+    QualType FieldTypes[4];
+
+    // struct objc_object *receiver;
+    FieldTypes[0] = Context->getObjCIdType();
+    // int flags;
+    FieldTypes[1] = Context->IntTy;
+    // char *str;
+    FieldTypes[2] = Context->getPointerType(Context->CharTy);
+    // long length;
+    FieldTypes[3] = Context->LongTy;
+
+    // Create fields
+    for (unsigned i = 0; i < 4; ++i) {
+      ConstantStringDecl->addDecl(FieldDecl::Create(*Context,
+                                                    ConstantStringDecl,
+                                                    SourceLocation(),
+                                                    SourceLocation(), 0,
+                                                    FieldTypes[i], 0,
+                                                    /*BitWidth=*/0,
+                                                    /*Mutable=*/true));
+    }
+
+    ConstantStringDecl->completeDefinition();
+  }
+  return Context->getTagDeclType(ConstantStringDecl);
+}
+
+Stmt *RewriteObjC::SynthMessageExpr(ObjCMessageExpr *Exp,
+                                    SourceLocation StartLoc,
+                                    SourceLocation EndLoc) {
+  if (!SelGetUidFunctionDecl)
+    SynthSelGetUidFunctionDecl();
+  if (!MsgSendFunctionDecl)
+    SynthMsgSendFunctionDecl();
+  if (!MsgSendSuperFunctionDecl)
+    SynthMsgSendSuperFunctionDecl();
+  if (!MsgSendStretFunctionDecl)
+    SynthMsgSendStretFunctionDecl();
+  if (!MsgSendSuperStretFunctionDecl)
+    SynthMsgSendSuperStretFunctionDecl();
+  if (!MsgSendFpretFunctionDecl)
+    SynthMsgSendFpretFunctionDecl();
+  if (!GetClassFunctionDecl)
+    SynthGetClassFunctionDecl();
+  if (!GetSuperClassFunctionDecl)
+    SynthGetSuperClassFunctionDecl();
+  if (!GetMetaClassFunctionDecl)
+    SynthGetMetaClassFunctionDecl();
+
+  // default to objc_msgSend().
+  FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
+  // May need to use objc_msgSend_stret() as well.
+  FunctionDecl *MsgSendStretFlavor = 0;
+  if (ObjCMethodDecl *mDecl = Exp->getMethodDecl()) {
+    QualType resultType = mDecl->getResultType();
+    if (resultType->isRecordType())
+      MsgSendStretFlavor = MsgSendStretFunctionDecl;
+    else if (resultType->isRealFloatingType())
+      MsgSendFlavor = MsgSendFpretFunctionDecl;
+  }
+
+  // Synthesize a call to objc_msgSend().
+  llvm::SmallVector<Expr*, 8> MsgExprs;
+  switch (Exp->getReceiverKind()) {
+  case ObjCMessageExpr::SuperClass: {
+    MsgSendFlavor = MsgSendSuperFunctionDecl;
+    if (MsgSendStretFlavor)
+      MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
+    assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
+
+    ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
+
+    llvm::SmallVector<Expr*, 4> InitExprs;
+
+    // set the receiver to self, the first argument to all methods.
+    InitExprs.push_back(
+      NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
+                               CK_BitCast,
+                   new (Context) DeclRefExpr(CurMethodDef->getSelfDecl(),
+                                             Context->getObjCIdType(),
+                                             VK_RValue,
+                                             SourceLocation()))
+                        ); // set the 'receiver'.
+
+    // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
+    llvm::SmallVector<Expr*, 8> ClsExprs;
+    QualType argType = Context->getPointerType(Context->CharTy);
+    ClsExprs.push_back(StringLiteral::Create(*Context,
+                                   ClassDecl->getIdentifier()->getNameStart(),
+                                   ClassDecl->getIdentifier()->getLength(),
+                                   false, false, argType, SourceLocation()));
+    CallExpr *Cls = SynthesizeCallToFunctionDecl(GetMetaClassFunctionDecl,
+                                                 &ClsExprs[0],
+                                                 ClsExprs.size(),
+                                                 StartLoc,
+                                                 EndLoc);
+    // (Class)objc_getClass("CurrentClass")
+    CastExpr *ArgExpr = NoTypeInfoCStyleCastExpr(Context,
+                                             Context->getObjCClassType(),
+                                             CK_BitCast, Cls);
+    ClsExprs.clear();
+    ClsExprs.push_back(ArgExpr);
+    Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl,
+                                       &ClsExprs[0], ClsExprs.size(),
+                                       StartLoc, EndLoc);
+    
+    // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
+    // To turn off a warning, type-cast to 'id'
+    InitExprs.push_back( // set 'super class', using class_getSuperclass().
+                        NoTypeInfoCStyleCastExpr(Context,
+                                                 Context->getObjCIdType(),
+                                                 CK_BitCast, Cls));
+    // struct objc_super
+    QualType superType = getSuperStructType();
+    Expr *SuperRep;
+
+    if (LangOpts.Microsoft) {
+      SynthSuperContructorFunctionDecl();
+      // Simulate a contructor call...
+      DeclRefExpr *DRE = new (Context) DeclRefExpr(SuperContructorFunctionDecl,
+                                                   superType, VK_LValue,
+                                                   SourceLocation());
+      SuperRep = new (Context) CallExpr(*Context, DRE, &InitExprs[0],
+                                        InitExprs.size(),
+                                        superType, VK_LValue,
+                                        SourceLocation());
+      // The code for super is a little tricky to prevent collision with
+      // the structure definition in the header. The rewriter has it's own
+      // internal definition (__rw_objc_super) that is uses. This is why
+      // we need the cast below. For example:
+      // (struct objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
+      //
+      SuperRep = new (Context) UnaryOperator(SuperRep, UO_AddrOf,
+                               Context->getPointerType(SuperRep->getType()),
+                                             VK_RValue, OK_Ordinary,
+                                             SourceLocation());
+      SuperRep = NoTypeInfoCStyleCastExpr(Context,
+                                          Context->getPointerType(superType),
+                                          CK_BitCast, SuperRep);
+    } else {
+      // (struct objc_super) { <exprs from above> }
+      InitListExpr *ILE =
+        new (Context) InitListExpr(*Context, SourceLocation(),
+                                   &InitExprs[0], InitExprs.size(),
+                                   SourceLocation());
+      TypeSourceInfo *superTInfo
+        = Context->getTrivialTypeSourceInfo(superType);
+      SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
+                                                   superType, VK_LValue,
+                                                   ILE, false);
+      // struct objc_super *
+      SuperRep = new (Context) UnaryOperator(SuperRep, UO_AddrOf,
+                               Context->getPointerType(SuperRep->getType()),
+                                             VK_RValue, OK_Ordinary,
+                                             SourceLocation());
+    }
+    MsgExprs.push_back(SuperRep);
+    break;
+  }
+
+  case ObjCMessageExpr::Class: {
+    llvm::SmallVector<Expr*, 8> ClsExprs;
+    QualType argType = Context->getPointerType(Context->CharTy);
+    ObjCInterfaceDecl *Class
+      = Exp->getClassReceiver()->getAs<ObjCObjectType>()->getInterface();
+    IdentifierInfo *clsName = Class->getIdentifier();
+    ClsExprs.push_back(StringLiteral::Create(*Context,
+                                             clsName->getNameStart(),
+                                             clsName->getLength(),
+                                             false, false, 
+                                             argType, SourceLocation()));
+    CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl,
+                                                 &ClsExprs[0],
+                                                 ClsExprs.size(), 
+                                                 StartLoc, EndLoc);
+    MsgExprs.push_back(Cls);
+    break;
+  }
+
+  case ObjCMessageExpr::SuperInstance:{
+    MsgSendFlavor = MsgSendSuperFunctionDecl;
+    if (MsgSendStretFlavor)
+      MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
+    assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
+    ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
+    llvm::SmallVector<Expr*, 4> InitExprs;
+
+    InitExprs.push_back(
+      NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
+                               CK_BitCast,
+                   new (Context) DeclRefExpr(CurMethodDef->getSelfDecl(),
+                                             Context->getObjCIdType(),
+                                             VK_RValue, SourceLocation()))
+                        ); // set the 'receiver'.
+    
+    // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
+    llvm::SmallVector<Expr*, 8> ClsExprs;
+    QualType argType = Context->getPointerType(Context->CharTy);
+    ClsExprs.push_back(StringLiteral::Create(*Context,
+                                   ClassDecl->getIdentifier()->getNameStart(),
+                                   ClassDecl->getIdentifier()->getLength(),
+                                   false, false, argType, SourceLocation()));
+    CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl,
+                                                 &ClsExprs[0],
+                                                 ClsExprs.size(), 
+                                                 StartLoc, EndLoc);
+    // (Class)objc_getClass("CurrentClass")
+    CastExpr *ArgExpr = NoTypeInfoCStyleCastExpr(Context,
+                                                 Context->getObjCClassType(),
+                                                 CK_BitCast, Cls);
+    ClsExprs.clear();
+    ClsExprs.push_back(ArgExpr);
+    Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl,
+                                       &ClsExprs[0], ClsExprs.size(),
+                                       StartLoc, EndLoc);
+    
+    // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
+    // To turn off a warning, type-cast to 'id'
+    InitExprs.push_back(
+      // set 'super class', using class_getSuperclass().
+      NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
+                               CK_BitCast, Cls));
+    // struct objc_super
+    QualType superType = getSuperStructType();
+    Expr *SuperRep;
+
+    if (LangOpts.Microsoft) {
+      SynthSuperContructorFunctionDecl();
+      // Simulate a contructor call...
+      DeclRefExpr *DRE = new (Context) DeclRefExpr(SuperContructorFunctionDecl,
+                                                   superType, VK_LValue,
+                                                   SourceLocation());
+      SuperRep = new (Context) CallExpr(*Context, DRE, &InitExprs[0],
+                                        InitExprs.size(),
+                                        superType, VK_LValue, SourceLocation());
+      // The code for super is a little tricky to prevent collision with
+      // the structure definition in the header. The rewriter has it's own
+      // internal definition (__rw_objc_super) that is uses. This is why
+      // we need the cast below. For example:
+      // (struct objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
+      //
+      SuperRep = new (Context) UnaryOperator(SuperRep, UO_AddrOf,
+                               Context->getPointerType(SuperRep->getType()),
+                               VK_RValue, OK_Ordinary,
+                               SourceLocation());
+      SuperRep = NoTypeInfoCStyleCastExpr(Context,
+                               Context->getPointerType(superType),
+                               CK_BitCast, SuperRep);
+    } else {
+      // (struct objc_super) { <exprs from above> }
+      InitListExpr *ILE =
+        new (Context) InitListExpr(*Context, SourceLocation(),
+                                   &InitExprs[0], InitExprs.size(),
+                                   SourceLocation());
+      TypeSourceInfo *superTInfo
+        = Context->getTrivialTypeSourceInfo(superType);
+      SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
+                                                   superType, VK_RValue, ILE,
+                                                   false);
+    }
+    MsgExprs.push_back(SuperRep);
+    break;
+  }
+
+  case ObjCMessageExpr::Instance: {
+    // Remove all type-casts because it may contain objc-style types; e.g.
+    // Foo<Proto> *.
+    Expr *recExpr = Exp->getInstanceReceiver();
+    while (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(recExpr))
+      recExpr = CE->getSubExpr();
+    recExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
+                                       CK_BitCast, recExpr);
+    MsgExprs.push_back(recExpr);
+    break;
+  }
+  }
+
+  // Create a call to sel_registerName("selName"), it will be the 2nd argument.
+  llvm::SmallVector<Expr*, 8> SelExprs;
+  QualType argType = Context->getPointerType(Context->CharTy);
+  SelExprs.push_back(StringLiteral::Create(*Context,
+                                       Exp->getSelector().getAsString().c_str(),
+                                       Exp->getSelector().getAsString().size(),
+                                       false, false, argType, SourceLocation()));
+  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
+                                                 &SelExprs[0], SelExprs.size(),
+                                                  StartLoc,
+                                                  EndLoc);
+  MsgExprs.push_back(SelExp);
+
+  // Now push any user supplied arguments.
+  for (unsigned i = 0; i < Exp->getNumArgs(); i++) {
+    Expr *userExpr = Exp->getArg(i);
+    // Make all implicit casts explicit...ICE comes in handy:-)
+    if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(userExpr)) {
+      // Reuse the ICE type, it is exactly what the doctor ordered.
+      QualType type = ICE->getType();
+      if (needToScanForQualifiers(type))
+        type = Context->getObjCIdType();
+      // Make sure we convert "type (^)(...)" to "type (*)(...)".
+      (void)convertBlockPointerToFunctionPointer(type);
+      userExpr = NoTypeInfoCStyleCastExpr(Context, type, CK_BitCast,
+                                          userExpr);
+    }
+    // Make id<P...> cast into an 'id' cast.
+    else if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(userExpr)) {
+      if (CE->getType()->isObjCQualifiedIdType()) {
+        while ((CE = dyn_cast<CStyleCastExpr>(userExpr)))
+          userExpr = CE->getSubExpr();
+        userExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
+                                            CK_BitCast, userExpr);
+      }
+    }
+    MsgExprs.push_back(userExpr);
+    // We've transferred the ownership to MsgExprs. For now, we *don't* null
+    // out the argument in the original expression (since we aren't deleting
+    // the ObjCMessageExpr). See RewritePropertyOrImplicitSetter() usage for more info.
+    //Exp->setArg(i, 0);
+  }
+  // Generate the funky cast.
+  CastExpr *cast;
+  llvm::SmallVector<QualType, 8> ArgTypes;
+  QualType returnType;
+
+  // Push 'id' and 'SEL', the 2 implicit arguments.
+  if (MsgSendFlavor == MsgSendSuperFunctionDecl)
+    ArgTypes.push_back(Context->getPointerType(getSuperStructType()));
+  else
+    ArgTypes.push_back(Context->getObjCIdType());
+  ArgTypes.push_back(Context->getObjCSelType());
+  if (ObjCMethodDecl *OMD = Exp->getMethodDecl()) {
+    // Push any user argument types.
+    for (ObjCMethodDecl::param_iterator PI = OMD->param_begin(),
+         E = OMD->param_end(); PI != E; ++PI) {
+      QualType t = (*PI)->getType()->isObjCQualifiedIdType()
+                     ? Context->getObjCIdType()
+                     : (*PI)->getType();
+      // Make sure we convert "t (^)(...)" to "t (*)(...)".
+      (void)convertBlockPointerToFunctionPointer(t);
+      ArgTypes.push_back(t);
+    }
+    returnType = OMD->getResultType()->isObjCQualifiedIdType()
+                   ? Context->getObjCIdType() : OMD->getResultType();
+    (void)convertBlockPointerToFunctionPointer(returnType);
+  } else {
+    returnType = Context->getObjCIdType();
+  }
+  // Get the type, we will need to reference it in a couple spots.
+  QualType msgSendType = MsgSendFlavor->getType();
+
+  // Create a reference to the objc_msgSend() declaration.
+  DeclRefExpr *DRE = new (Context) DeclRefExpr(MsgSendFlavor, msgSendType,
+                                               VK_LValue, SourceLocation());
+
+  // Need to cast objc_msgSend to "void *" (to workaround a GCC bandaid).
+  // If we don't do this cast, we get the following bizarre warning/note:
+  // xx.m:13: warning: function called through a non-compatible type
+  // xx.m:13: note: if this code is reached, the program will abort
+  cast = NoTypeInfoCStyleCastExpr(Context,
+                                  Context->getPointerType(Context->VoidTy),
+                                  CK_BitCast, DRE);
+
+  // Now do the "normal" pointer to function cast.
+  QualType castType =
+    getSimpleFunctionType(returnType, &ArgTypes[0], ArgTypes.size(),
+      // If we don't have a method decl, force a variadic cast.
+      Exp->getMethodDecl() ? Exp->getMethodDecl()->isVariadic() : true);
+  castType = Context->getPointerType(castType);
+  cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
+                                  cast);
+
+  // Don't forget the parens to enforce the proper binding.
+  ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
+
+  const FunctionType *FT = msgSendType->getAs<FunctionType>();
+  CallExpr *CE = new (Context) CallExpr(*Context, PE, &MsgExprs[0],
+                                        MsgExprs.size(),
+                                        FT->getResultType(), VK_RValue,
+                                        EndLoc);
+  Stmt *ReplacingStmt = CE;
+  if (MsgSendStretFlavor) {
+    // We have the method which returns a struct/union. Must also generate
+    // call to objc_msgSend_stret and hang both varieties on a conditional
+    // expression which dictate which one to envoke depending on size of
+    // method's return type.
+
+    // Create a reference to the objc_msgSend_stret() declaration.
+    DeclRefExpr *STDRE = new (Context) DeclRefExpr(MsgSendStretFlavor, msgSendType,
+                                                   VK_LValue, SourceLocation());
+    // Need to cast objc_msgSend_stret to "void *" (see above comment).
+    cast = NoTypeInfoCStyleCastExpr(Context,
+                                    Context->getPointerType(Context->VoidTy),
+                                    CK_BitCast, STDRE);
+    // Now do the "normal" pointer to function cast.
+    castType = getSimpleFunctionType(returnType, &ArgTypes[0], ArgTypes.size(),
+      Exp->getMethodDecl() ? Exp->getMethodDecl()->isVariadic() : false);
+    castType = Context->getPointerType(castType);
+    cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
+                                    cast);
+
+    // Don't forget the parens to enforce the proper binding.
+    PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), cast);
+
+    FT = msgSendType->getAs<FunctionType>();
+    CallExpr *STCE = new (Context) CallExpr(*Context, PE, &MsgExprs[0],
+                                            MsgExprs.size(),
+                                            FT->getResultType(), VK_RValue,
+                                            SourceLocation());
+
+    // Build sizeof(returnType)
+    UnaryExprOrTypeTraitExpr *sizeofExpr =
+       new (Context) UnaryExprOrTypeTraitExpr(UETT_SizeOf,
+                                 Context->getTrivialTypeSourceInfo(returnType),
+                                 Context->getSizeType(), SourceLocation(),
+                                 SourceLocation());
+    // (sizeof(returnType) <= 8 ? objc_msgSend(...) : objc_msgSend_stret(...))
+    // FIXME: Value of 8 is base on ppc32/x86 ABI for the most common cases.
+    // For X86 it is more complicated and some kind of target specific routine
+    // is needed to decide what to do.
+    unsigned IntSize =
+      static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
+    IntegerLiteral *limit = IntegerLiteral::Create(*Context,
+                                                   llvm::APInt(IntSize, 8),
+                                                   Context->IntTy,
+                                                   SourceLocation());
+    BinaryOperator *lessThanExpr = 
+      new (Context) BinaryOperator(sizeofExpr, limit, BO_LE, Context->IntTy,
+                                   VK_RValue, OK_Ordinary, SourceLocation());
+    // (sizeof(returnType) <= 8 ? objc_msgSend(...) : objc_msgSend_stret(...))
+    ConditionalOperator *CondExpr =
+      new (Context) ConditionalOperator(lessThanExpr,
+                                        SourceLocation(), CE,
+                                        SourceLocation(), STCE,
+                                        returnType, VK_RValue, OK_Ordinary);
+    ReplacingStmt = new (Context) ParenExpr(SourceLocation(), SourceLocation(), 
+                                            CondExpr);
+  }
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return ReplacingStmt;
+}
+
+Stmt *RewriteObjC::RewriteMessageExpr(ObjCMessageExpr *Exp) {
+  Stmt *ReplacingStmt = SynthMessageExpr(Exp, Exp->getLocStart(),
+                                         Exp->getLocEnd());
+
+  // Now do the actual rewrite.
+  ReplaceStmt(Exp, ReplacingStmt);
+
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return ReplacingStmt;
+}
+
+// typedef struct objc_object Protocol;
+QualType RewriteObjC::getProtocolType() {
+  if (!ProtocolTypeDecl) {
+    TypeSourceInfo *TInfo
+      = Context->getTrivialTypeSourceInfo(Context->getObjCIdType());
+    ProtocolTypeDecl = TypedefDecl::Create(*Context, TUDecl,
+                                           SourceLocation(), SourceLocation(),
+                                           &Context->Idents.get("Protocol"),
+                                           TInfo);
+  }
+  return Context->getTypeDeclType(ProtocolTypeDecl);
+}
+
+/// RewriteObjCProtocolExpr - Rewrite a protocol expression into
+/// a synthesized/forward data reference (to the protocol's metadata).
+/// The forward references (and metadata) are generated in
+/// RewriteObjC::HandleTranslationUnit().
+Stmt *RewriteObjC::RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp) {
+  std::string Name = "_OBJC_PROTOCOL_" + Exp->getProtocol()->getNameAsString();
+  IdentifierInfo *ID = &Context->Idents.get(Name);
+  VarDecl *VD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
+                                SourceLocation(), ID, getProtocolType(), 0,
+                                SC_Extern, SC_None);
+  DeclRefExpr *DRE = new (Context) DeclRefExpr(VD, getProtocolType(), VK_LValue,
+                                               SourceLocation());
+  Expr *DerefExpr = new (Context) UnaryOperator(DRE, UO_AddrOf,
+                             Context->getPointerType(DRE->getType()),
+                             VK_RValue, OK_Ordinary, SourceLocation());
+  CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, DerefExpr->getType(),
+                                                CK_BitCast,
+                                                DerefExpr);
+  ReplaceStmt(Exp, castExpr);
+  ProtocolExprDecls.insert(Exp->getProtocol());
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return castExpr;
+
+}
+
+bool RewriteObjC::BufferContainsPPDirectives(const char *startBuf,
+                                             const char *endBuf) {
+  while (startBuf < endBuf) {
+    if (*startBuf == '#') {
+      // Skip whitespace.
+      for (++startBuf; startBuf[0] == ' ' || startBuf[0] == '\t'; ++startBuf)
+        ;
+      if (!strncmp(startBuf, "if", strlen("if")) ||
+          !strncmp(startBuf, "ifdef", strlen("ifdef")) ||
+          !strncmp(startBuf, "ifndef", strlen("ifndef")) ||
+          !strncmp(startBuf, "define", strlen("define")) ||
+          !strncmp(startBuf, "undef", strlen("undef")) ||
+          !strncmp(startBuf, "else", strlen("else")) ||
+          !strncmp(startBuf, "elif", strlen("elif")) ||
+          !strncmp(startBuf, "endif", strlen("endif")) ||
+          !strncmp(startBuf, "pragma", strlen("pragma")) ||
+          !strncmp(startBuf, "include", strlen("include")) ||
+          !strncmp(startBuf, "import", strlen("import")) ||
+          !strncmp(startBuf, "include_next", strlen("include_next")))
+        return true;
+    }
+    startBuf++;
+  }
+  return false;
+}
+
+/// SynthesizeObjCInternalStruct - Rewrite one internal struct corresponding to
+/// an objective-c class with ivars.
+void RewriteObjC::SynthesizeObjCInternalStruct(ObjCInterfaceDecl *CDecl,
+                                               std::string &Result) {
+  assert(CDecl && "Class missing in SynthesizeObjCInternalStruct");
+  assert(CDecl->getName() != "" &&
+         "Name missing in SynthesizeObjCInternalStruct");
+  // Do not synthesize more than once.
+  if (ObjCSynthesizedStructs.count(CDecl))
+    return;
+  ObjCInterfaceDecl *RCDecl = CDecl->getSuperClass();
+  int NumIvars = CDecl->ivar_size();
+  SourceLocation LocStart = CDecl->getLocStart();
+  SourceLocation LocEnd = CDecl->getLocEnd();
+
+  const char *startBuf = SM->getCharacterData(LocStart);
+  const char *endBuf = SM->getCharacterData(LocEnd);
+
+  // If no ivars and no root or if its root, directly or indirectly,
+  // have no ivars (thus not synthesized) then no need to synthesize this class.
+  if ((CDecl->isForwardDecl() || NumIvars == 0) &&
+      (!RCDecl || !ObjCSynthesizedStructs.count(RCDecl))) {
+    endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
+    ReplaceText(LocStart, endBuf-startBuf, Result);
+    return;
+  }
+
+  // FIXME: This has potential of causing problem. If
+  // SynthesizeObjCInternalStruct is ever called recursively.
+  Result += "\nstruct ";
+  Result += CDecl->getNameAsString();
+  if (LangOpts.Microsoft)
+    Result += "_IMPL";
+
+  if (NumIvars > 0) {
+    const char *cursor = strchr(startBuf, '{');
+    assert((cursor && endBuf)
+           && "SynthesizeObjCInternalStruct - malformed @interface");
+    // If the buffer contains preprocessor directives, we do more fine-grained
+    // rewrites. This is intended to fix code that looks like (which occurs in
+    // NSURL.h, for example):
+    //
+    // #ifdef XYZ
+    // @interface Foo : NSObject
+    // #else
+    // @interface FooBar : NSObject
+    // #endif
+    // {
+    //    int i;
+    // }
+    // @end
+    //
+    // This clause is segregated to avoid breaking the common case.
+    if (BufferContainsPPDirectives(startBuf, cursor)) {
+      SourceLocation L = RCDecl ? CDecl->getSuperClassLoc() :
+                                  CDecl->getClassLoc();
+      const char *endHeader = SM->getCharacterData(L);
+      endHeader += Lexer::MeasureTokenLength(L, *SM, LangOpts);
+
+      if (CDecl->protocol_begin() != CDecl->protocol_end()) {
+        // advance to the end of the referenced protocols.
+        while (endHeader < cursor && *endHeader != '>') endHeader++;
+        endHeader++;
+      }
+      // rewrite the original header
+      ReplaceText(LocStart, endHeader-startBuf, Result);
+    } else {
+      // rewrite the original header *without* disturbing the '{'
+      ReplaceText(LocStart, cursor-startBuf, Result);
+    }
+    if (RCDecl && ObjCSynthesizedStructs.count(RCDecl)) {
+      Result = "\n    struct ";
+      Result += RCDecl->getNameAsString();
+      Result += "_IMPL ";
+      Result += RCDecl->getNameAsString();
+      Result += "_IVARS;\n";
+
+      // insert the super class structure definition.
+      SourceLocation OnePastCurly =
+        LocStart.getFileLocWithOffset(cursor-startBuf+1);
+      InsertText(OnePastCurly, Result);
+    }
+    cursor++; // past '{'
+
+    // Now comment out any visibility specifiers.
+    while (cursor < endBuf) {
+      if (*cursor == '@') {
+        SourceLocation atLoc = LocStart.getFileLocWithOffset(cursor-startBuf);
+        // Skip whitespace.
+        for (++cursor; cursor[0] == ' ' || cursor[0] == '\t'; ++cursor)
+          /*scan*/;
+
+        // FIXME: presence of @public, etc. inside comment results in
+        // this transformation as well, which is still correct c-code.
+        if (!strncmp(cursor, "public", strlen("public")) ||
+            !strncmp(cursor, "private", strlen("private")) ||
+            !strncmp(cursor, "package", strlen("package")) ||
+            !strncmp(cursor, "protected", strlen("protected")))
+          InsertText(atLoc, "// ");
+      }
+      // FIXME: If there are cases where '<' is used in ivar declaration part
+      // of user code, then scan the ivar list and use needToScanForQualifiers
+      // for type checking.
+      else if (*cursor == '<') {
+        SourceLocation atLoc = LocStart.getFileLocWithOffset(cursor-startBuf);
+        InsertText(atLoc, "/* ");
+        cursor = strchr(cursor, '>');
+        cursor++;
+        atLoc = LocStart.getFileLocWithOffset(cursor-startBuf);
+        InsertText(atLoc, " */");
+      } else if (*cursor == '^') { // rewrite block specifier.
+        SourceLocation caretLoc = LocStart.getFileLocWithOffset(cursor-startBuf);
+        ReplaceText(caretLoc, 1, "*");
+      }
+      cursor++;
+    }
+    // Don't forget to add a ';'!!
+    InsertText(LocEnd.getFileLocWithOffset(1), ";");
+  } else { // we don't have any instance variables - insert super struct.
+    endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
+    Result += " {\n    struct ";
+    Result += RCDecl->getNameAsString();
+    Result += "_IMPL ";
+    Result += RCDecl->getNameAsString();
+    Result += "_IVARS;\n};\n";
+    ReplaceText(LocStart, endBuf-startBuf, Result);
+  }
+  // Mark this struct as having been generated.
+  if (!ObjCSynthesizedStructs.insert(CDecl))
+    assert(false && "struct already synthesize- SynthesizeObjCInternalStruct");
+}
+
+// RewriteObjCMethodsMetaData - Rewrite methods metadata for instance or
+/// class methods.
+template<typename MethodIterator>
+void RewriteObjC::RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
+                                             MethodIterator MethodEnd,
+                                             bool IsInstanceMethod,
+                                             llvm::StringRef prefix,
+                                             llvm::StringRef ClassName,
+                                             std::string &Result) {
+  if (MethodBegin == MethodEnd) return;
+
+  if (!objc_impl_method) {
+    /* struct _objc_method {
+       SEL _cmd;
+       char *method_types;
+       void *_imp;
+       }
+     */
+    Result += "\nstruct _objc_method {\n";
+    Result += "\tSEL _cmd;\n";
+    Result += "\tchar *method_types;\n";
+    Result += "\tvoid *_imp;\n";
+    Result += "};\n";
+
+    objc_impl_method = true;
+  }
+
+  // Build _objc_method_list for class's methods if needed
+
+  /* struct  {
+   struct _objc_method_list *next_method;
+   int method_count;
+   struct _objc_method method_list[];
+   }
+   */
+  unsigned NumMethods = std::distance(MethodBegin, MethodEnd);
+  Result += "\nstatic struct {\n";
+  Result += "\tstruct _objc_method_list *next_method;\n";
+  Result += "\tint method_count;\n";
+  Result += "\tstruct _objc_method method_list[";
+  Result += utostr(NumMethods);
+  Result += "];\n} _OBJC_";
+  Result += prefix;
+  Result += IsInstanceMethod ? "INSTANCE" : "CLASS";
+  Result += "_METHODS_";
+  Result += ClassName;
+  Result += " __attribute__ ((used, section (\"__OBJC, __";
+  Result += IsInstanceMethod ? "inst" : "cls";
+  Result += "_meth\")))= ";
+  Result += "{\n\t0, " + utostr(NumMethods) + "\n";
+
+  Result += "\t,{{(SEL)\"";
+  Result += (*MethodBegin)->getSelector().getAsString().c_str();
+  std::string MethodTypeString;
+  Context->getObjCEncodingForMethodDecl(*MethodBegin, MethodTypeString);
+  Result += "\", \"";
+  Result += MethodTypeString;
+  Result += "\", (void *)";
+  Result += MethodInternalNames[*MethodBegin];
+  Result += "}\n";
+  for (++MethodBegin; MethodBegin != MethodEnd; ++MethodBegin) {
+    Result += "\t  ,{(SEL)\"";
+    Result += (*MethodBegin)->getSelector().getAsString().c_str();
+    std::string MethodTypeString;
+    Context->getObjCEncodingForMethodDecl(*MethodBegin, MethodTypeString);
+    Result += "\", \"";
+    Result += MethodTypeString;
+    Result += "\", (void *)";
+    Result += MethodInternalNames[*MethodBegin];
+    Result += "}\n";
+  }
+  Result += "\t }\n};\n";
+}
+
+/// RewriteObjCProtocolMetaData - Rewrite protocols meta-data.
+void RewriteObjC::
+RewriteObjCProtocolMetaData(ObjCProtocolDecl *PDecl, llvm::StringRef prefix,
+                            llvm::StringRef ClassName, std::string &Result) {
+  static bool objc_protocol_methods = false;
+
+  // Output struct protocol_methods holder of method selector and type.
+  if (!objc_protocol_methods && !PDecl->isForwardDecl()) {
+    /* struct protocol_methods {
+     SEL _cmd;
+     char *method_types;
+     }
+     */
+    Result += "\nstruct _protocol_methods {\n";
+    Result += "\tstruct objc_selector *_cmd;\n";
+    Result += "\tchar *method_types;\n";
+    Result += "};\n";
+
+    objc_protocol_methods = true;
+  }
+  // Do not synthesize the protocol more than once.
+  if (ObjCSynthesizedProtocols.count(PDecl))
+    return;
+
+    if (PDecl->instmeth_begin() != PDecl->instmeth_end()) {
+      unsigned NumMethods = std::distance(PDecl->instmeth_begin(),
+                                          PDecl->instmeth_end());
+    /* struct _objc_protocol_method_list {
+     int protocol_method_count;
+     struct protocol_methods protocols[];
+     }
+     */
+    Result += "\nstatic struct {\n";
+    Result += "\tint protocol_method_count;\n";
+    Result += "\tstruct _protocol_methods protocol_methods[";
+    Result += utostr(NumMethods);
+    Result += "];\n} _OBJC_PROTOCOL_INSTANCE_METHODS_";
+    Result += PDecl->getNameAsString();
+    Result += " __attribute__ ((used, section (\"__OBJC, __cat_inst_meth\")))= "
+      "{\n\t" + utostr(NumMethods) + "\n";
+
+    // Output instance methods declared in this protocol.
+    for (ObjCProtocolDecl::instmeth_iterator
+           I = PDecl->instmeth_begin(), E = PDecl->instmeth_end();
+         I != E; ++I) {
+      if (I == PDecl->instmeth_begin())
+        Result += "\t  ,{{(struct objc_selector *)\"";
+      else
+        Result += "\t  ,{(struct objc_selector *)\"";
+      Result += (*I)->getSelector().getAsString();
+      std::string MethodTypeString;
+      Context->getObjCEncodingForMethodDecl((*I), MethodTypeString);
+      Result += "\", \"";
+      Result += MethodTypeString;
+      Result += "\"}\n";
+    }
+    Result += "\t }\n};\n";
+  }
+
+  // Output class methods declared in this protocol.
+  unsigned NumMethods = std::distance(PDecl->classmeth_begin(),
+                                      PDecl->classmeth_end());
+  if (NumMethods > 0) {
+    /* struct _objc_protocol_method_list {
+     int protocol_method_count;
+     struct protocol_methods protocols[];
+     }
+     */
+    Result += "\nstatic struct {\n";
+    Result += "\tint protocol_method_count;\n";
+    Result += "\tstruct _protocol_methods protocol_methods[";
+    Result += utostr(NumMethods);
+    Result += "];\n} _OBJC_PROTOCOL_CLASS_METHODS_";
+    Result += PDecl->getNameAsString();
+    Result += " __attribute__ ((used, section (\"__OBJC, __cat_cls_meth\")))= "
+           "{\n\t";
+    Result += utostr(NumMethods);
+    Result += "\n";
+
+    // Output instance methods declared in this protocol.
+    for (ObjCProtocolDecl::classmeth_iterator
+           I = PDecl->classmeth_begin(), E = PDecl->classmeth_end();
+         I != E; ++I) {
+      if (I == PDecl->classmeth_begin())
+        Result += "\t  ,{{(struct objc_selector *)\"";
+      else
+        Result += "\t  ,{(struct objc_selector *)\"";
+      Result += (*I)->getSelector().getAsString();
+      std::string MethodTypeString;
+      Context->getObjCEncodingForMethodDecl((*I), MethodTypeString);
+      Result += "\", \"";
+      Result += MethodTypeString;
+      Result += "\"}\n";
+    }
+    Result += "\t }\n};\n";
+  }
+
+  // Output:
+  /* struct _objc_protocol {
+   // Objective-C 1.0 extensions
+   struct _objc_protocol_extension *isa;
+   char *protocol_name;
+   struct _objc_protocol **protocol_list;
+   struct _objc_protocol_method_list *instance_methods;
+   struct _objc_protocol_method_list *class_methods;
+   };
+   */
+  static bool objc_protocol = false;
+  if (!objc_protocol) {
+    Result += "\nstruct _objc_protocol {\n";
+    Result += "\tstruct _objc_protocol_extension *isa;\n";
+    Result += "\tchar *protocol_name;\n";
+    Result += "\tstruct _objc_protocol **protocol_list;\n";
+    Result += "\tstruct _objc_protocol_method_list *instance_methods;\n";
+    Result += "\tstruct _objc_protocol_method_list *class_methods;\n";
+    Result += "};\n";
+
+    objc_protocol = true;
+  }
+
+  Result += "\nstatic struct _objc_protocol _OBJC_PROTOCOL_";
+  Result += PDecl->getNameAsString();
+  Result += " __attribute__ ((used, section (\"__OBJC, __protocol\")))= "
+    "{\n\t0, \"";
+  Result += PDecl->getNameAsString();
+  Result += "\", 0, ";
+  if (PDecl->instmeth_begin() != PDecl->instmeth_end()) {
+    Result += "(struct _objc_protocol_method_list *)&_OBJC_PROTOCOL_INSTANCE_METHODS_";
+    Result += PDecl->getNameAsString();
+    Result += ", ";
+  }
+  else
+    Result += "0, ";
+  if (PDecl->classmeth_begin() != PDecl->classmeth_end()) {
+    Result += "(struct _objc_protocol_method_list *)&_OBJC_PROTOCOL_CLASS_METHODS_";
+    Result += PDecl->getNameAsString();
+    Result += "\n";
+  }
+  else
+    Result += "0\n";
+  Result += "};\n";
+
+  // Mark this protocol as having been generated.
+  if (!ObjCSynthesizedProtocols.insert(PDecl))
+    assert(false && "protocol already synthesized");
+
+}
+
+void RewriteObjC::
+RewriteObjCProtocolListMetaData(const ObjCList<ObjCProtocolDecl> &Protocols,
+                                llvm::StringRef prefix, llvm::StringRef ClassName,
+                                std::string &Result) {
+  if (Protocols.empty()) return;
+
+  for (unsigned i = 0; i != Protocols.size(); i++)
+    RewriteObjCProtocolMetaData(Protocols[i], prefix, ClassName, Result);
+
+  // Output the top lovel protocol meta-data for the class.
+  /* struct _objc_protocol_list {
+   struct _objc_protocol_list *next;
+   int    protocol_count;
+   struct _objc_protocol *class_protocols[];
+   }
+   */
+  Result += "\nstatic struct {\n";
+  Result += "\tstruct _objc_protocol_list *next;\n";
+  Result += "\tint    protocol_count;\n";
+  Result += "\tstruct _objc_protocol *class_protocols[";
+  Result += utostr(Protocols.size());
+  Result += "];\n} _OBJC_";
+  Result += prefix;
+  Result += "_PROTOCOLS_";
+  Result += ClassName;
+  Result += " __attribute__ ((used, section (\"__OBJC, __cat_cls_meth\")))= "
+    "{\n\t0, ";
+  Result += utostr(Protocols.size());
+  Result += "\n";
+
+  Result += "\t,{&_OBJC_PROTOCOL_";
+  Result += Protocols[0]->getNameAsString();
+  Result += " \n";
+
+  for (unsigned i = 1; i != Protocols.size(); i++) {
+    Result += "\t ,&_OBJC_PROTOCOL_";
+    Result += Protocols[i]->getNameAsString();
+    Result += "\n";
+  }
+  Result += "\t }\n};\n";
+}
+
+
+/// RewriteObjCCategoryImplDecl - Rewrite metadata for each category
+/// implementation.
+void RewriteObjC::RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *IDecl,
+                                              std::string &Result) {
+  ObjCInterfaceDecl *ClassDecl = IDecl->getClassInterface();
+  // Find category declaration for this implementation.
+  ObjCCategoryDecl *CDecl;
+  for (CDecl = ClassDecl->getCategoryList(); CDecl;
+       CDecl = CDecl->getNextClassCategory())
+    if (CDecl->getIdentifier() == IDecl->getIdentifier())
+      break;
+
+  std::string FullCategoryName = ClassDecl->getNameAsString();
+  FullCategoryName += '_';
+  FullCategoryName += IDecl->getNameAsString();
+
+  // Build _objc_method_list for class's instance methods if needed
+  llvm::SmallVector<ObjCMethodDecl *, 32>
+    InstanceMethods(IDecl->instmeth_begin(), IDecl->instmeth_end());
+
+  // If any of our property implementations have associated getters or
+  // setters, produce metadata for them as well.
+  for (ObjCImplDecl::propimpl_iterator Prop = IDecl->propimpl_begin(),
+         PropEnd = IDecl->propimpl_end();
+       Prop != PropEnd; ++Prop) {
+    if ((*Prop)->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
+      continue;
+    if (!(*Prop)->getPropertyIvarDecl())
+      continue;
+    ObjCPropertyDecl *PD = (*Prop)->getPropertyDecl();
+    if (!PD)
+      continue;
+    if (ObjCMethodDecl *Getter = PD->getGetterMethodDecl())
+      InstanceMethods.push_back(Getter);
+    if (PD->isReadOnly())
+      continue;
+    if (ObjCMethodDecl *Setter = PD->getSetterMethodDecl())
+      InstanceMethods.push_back(Setter);
+  }
+  RewriteObjCMethodsMetaData(InstanceMethods.begin(), InstanceMethods.end(),
+                             true, "CATEGORY_", FullCategoryName.c_str(),
+                             Result);
+
+  // Build _objc_method_list for class's class methods if needed
+  RewriteObjCMethodsMetaData(IDecl->classmeth_begin(), IDecl->classmeth_end(),
+                             false, "CATEGORY_", FullCategoryName.c_str(),
+                             Result);
+
+  // Protocols referenced in class declaration?
+  // Null CDecl is case of a category implementation with no category interface
+  if (CDecl)
+    RewriteObjCProtocolListMetaData(CDecl->getReferencedProtocols(), "CATEGORY",
+                                    FullCategoryName, Result);
+  /* struct _objc_category {
+   char *category_name;
+   char *class_name;
+   struct _objc_method_list *instance_methods;
+   struct _objc_method_list *class_methods;
+   struct _objc_protocol_list *protocols;
+   // Objective-C 1.0 extensions
+   uint32_t size;     // sizeof (struct _objc_category)
+   struct _objc_property_list *instance_properties;  // category's own
+                                                     // @property decl.
+   };
+   */
+
+  static bool objc_category = false;
+  if (!objc_category) {
+    Result += "\nstruct _objc_category {\n";
+    Result += "\tchar *category_name;\n";
+    Result += "\tchar *class_name;\n";
+    Result += "\tstruct _objc_method_list *instance_methods;\n";
+    Result += "\tstruct _objc_method_list *class_methods;\n";
+    Result += "\tstruct _objc_protocol_list *protocols;\n";
+    Result += "\tunsigned int size;\n";
+    Result += "\tstruct _objc_property_list *instance_properties;\n";
+    Result += "};\n";
+    objc_category = true;
+  }
+  Result += "\nstatic struct _objc_category _OBJC_CATEGORY_";
+  Result += FullCategoryName;
+  Result += " __attribute__ ((used, section (\"__OBJC, __category\")))= {\n\t\"";
+  Result += IDecl->getNameAsString();
+  Result += "\"\n\t, \"";
+  Result += ClassDecl->getNameAsString();
+  Result += "\"\n";
+
+  if (IDecl->instmeth_begin() != IDecl->instmeth_end()) {
+    Result += "\t, (struct _objc_method_list *)"
+           "&_OBJC_CATEGORY_INSTANCE_METHODS_";
+    Result += FullCategoryName;
+    Result += "\n";
+  }
+  else
+    Result += "\t, 0\n";
+  if (IDecl->classmeth_begin() != IDecl->classmeth_end()) {
+    Result += "\t, (struct _objc_method_list *)"
+           "&_OBJC_CATEGORY_CLASS_METHODS_";
+    Result += FullCategoryName;
+    Result += "\n";
+  }
+  else
+    Result += "\t, 0\n";
+
+  if (CDecl && CDecl->protocol_begin() != CDecl->protocol_end()) {
+    Result += "\t, (struct _objc_protocol_list *)&_OBJC_CATEGORY_PROTOCOLS_";
+    Result += FullCategoryName;
+    Result += "\n";
+  }
+  else
+    Result += "\t, 0\n";
+  Result += "\t, sizeof(struct _objc_category), 0\n};\n";
+}
+
+/// SynthesizeIvarOffsetComputation - This rutine synthesizes computation of
+/// ivar offset.
+void RewriteObjC::SynthesizeIvarOffsetComputation(ObjCIvarDecl *ivar,
+                                                  std::string &Result) {
+  if (ivar->isBitField()) {
+    // FIXME: The hack below doesn't work for bitfields. For now, we simply
+    // place all bitfields at offset 0.
+    Result += "0";
+  } else {
+    Result += "__OFFSETOFIVAR__(struct ";
+    Result += ivar->getContainingInterface()->getNameAsString();
+    if (LangOpts.Microsoft)
+      Result += "_IMPL";
+    Result += ", ";
+    Result += ivar->getNameAsString();
+    Result += ")";
+  }
+}
+
+//===----------------------------------------------------------------------===//
+// Meta Data Emission
+//===----------------------------------------------------------------------===//
+
+void RewriteObjC::RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
+                                           std::string &Result) {
+  ObjCInterfaceDecl *CDecl = IDecl->getClassInterface();
+
+  // Explicitly declared @interface's are already synthesized.
+  if (CDecl->isImplicitInterfaceDecl()) {
+    // FIXME: Implementation of a class with no @interface (legacy) doese not
+    // produce correct synthesis as yet.
+    SynthesizeObjCInternalStruct(CDecl, Result);
+  }
+
+  // Build _objc_ivar_list metadata for classes ivars if needed
+  unsigned NumIvars = !IDecl->ivar_empty()
+                      ? IDecl->ivar_size()
+                      : (CDecl ? CDecl->ivar_size() : 0);
+  if (NumIvars > 0) {
+    static bool objc_ivar = false;
+    if (!objc_ivar) {
+      /* struct _objc_ivar {
+          char *ivar_name;
+          char *ivar_type;
+          int ivar_offset;
+        };
+       */
+      Result += "\nstruct _objc_ivar {\n";
+      Result += "\tchar *ivar_name;\n";
+      Result += "\tchar *ivar_type;\n";
+      Result += "\tint ivar_offset;\n";
+      Result += "};\n";
+
+      objc_ivar = true;
+    }
+
+    /* struct {
+       int ivar_count;
+       struct _objc_ivar ivar_list[nIvars];
+       };
+     */
+    Result += "\nstatic struct {\n";
+    Result += "\tint ivar_count;\n";
+    Result += "\tstruct _objc_ivar ivar_list[";
+    Result += utostr(NumIvars);
+    Result += "];\n} _OBJC_INSTANCE_VARIABLES_";
+    Result += IDecl->getNameAsString();
+    Result += " __attribute__ ((used, section (\"__OBJC, __instance_vars\")))= "
+      "{\n\t";
+    Result += utostr(NumIvars);
+    Result += "\n";
+
+    ObjCInterfaceDecl::ivar_iterator IVI, IVE;
+    llvm::SmallVector<ObjCIvarDecl *, 8> IVars;
+    if (!IDecl->ivar_empty()) {
+      for (ObjCInterfaceDecl::ivar_iterator
+             IV = IDecl->ivar_begin(), IVEnd = IDecl->ivar_end();
+           IV != IVEnd; ++IV)
+        IVars.push_back(*IV);
+      IVI = IDecl->ivar_begin();
+      IVE = IDecl->ivar_end();
+    } else {
+      IVI = CDecl->ivar_begin();
+      IVE = CDecl->ivar_end();
+    }
+    Result += "\t,{{\"";
+    Result += (*IVI)->getNameAsString();
+    Result += "\", \"";
+    std::string TmpString, StrEncoding;
+    Context->getObjCEncodingForType((*IVI)->getType(), TmpString, *IVI);
+    QuoteDoublequotes(TmpString, StrEncoding);
+    Result += StrEncoding;
+    Result += "\", ";
+    SynthesizeIvarOffsetComputation(*IVI, Result);
+    Result += "}\n";
+    for (++IVI; IVI != IVE; ++IVI) {
+      Result += "\t  ,{\"";
+      Result += (*IVI)->getNameAsString();
+      Result += "\", \"";
+      std::string TmpString, StrEncoding;
+      Context->getObjCEncodingForType((*IVI)->getType(), TmpString, *IVI);
+      QuoteDoublequotes(TmpString, StrEncoding);
+      Result += StrEncoding;
+      Result += "\", ";
+      SynthesizeIvarOffsetComputation((*IVI), Result);
+      Result += "}\n";
+    }
+
+    Result += "\t }\n};\n";
+  }
+
+  // Build _objc_method_list for class's instance methods if needed
+  llvm::SmallVector<ObjCMethodDecl *, 32>
+    InstanceMethods(IDecl->instmeth_begin(), IDecl->instmeth_end());
+
+  // If any of our property implementations have associated getters or
+  // setters, produce metadata for them as well.
+  for (ObjCImplDecl::propimpl_iterator Prop = IDecl->propimpl_begin(),
+         PropEnd = IDecl->propimpl_end();
+       Prop != PropEnd; ++Prop) {
+    if ((*Prop)->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
+      continue;
+    if (!(*Prop)->getPropertyIvarDecl())
+      continue;
+    ObjCPropertyDecl *PD = (*Prop)->getPropertyDecl();
+    if (!PD)
+      continue;
+    if (ObjCMethodDecl *Getter = PD->getGetterMethodDecl())
+      if (!Getter->isDefined())
+        InstanceMethods.push_back(Getter);
+    if (PD->isReadOnly())
+      continue;
+    if (ObjCMethodDecl *Setter = PD->getSetterMethodDecl())
+      if (!Setter->isDefined())
+        InstanceMethods.push_back(Setter);
+  }
+  RewriteObjCMethodsMetaData(InstanceMethods.begin(), InstanceMethods.end(),
+                             true, "", IDecl->getName(), Result);
+
+  // Build _objc_method_list for class's class methods if needed
+  RewriteObjCMethodsMetaData(IDecl->classmeth_begin(), IDecl->classmeth_end(),
+                             false, "", IDecl->getName(), Result);
+
+  // Protocols referenced in class declaration?
+  RewriteObjCProtocolListMetaData(CDecl->getReferencedProtocols(),
+                                  "CLASS", CDecl->getName(), Result);
+
+  // Declaration of class/meta-class metadata
+  /* struct _objc_class {
+   struct _objc_class *isa; // or const char *root_class_name when metadata
+   const char *super_class_name;
+   char *name;
+   long version;
+   long info;
+   long instance_size;
+   struct _objc_ivar_list *ivars;
+   struct _objc_method_list *methods;
+   struct objc_cache *cache;
+   struct objc_protocol_list *protocols;
+   const char *ivar_layout;
+   struct _objc_class_ext  *ext;
+   };
+  */
+  static bool objc_class = false;
+  if (!objc_class) {
+    Result += "\nstruct _objc_class {\n";
+    Result += "\tstruct _objc_class *isa;\n";
+    Result += "\tconst char *super_class_name;\n";
+    Result += "\tchar *name;\n";
+    Result += "\tlong version;\n";
+    Result += "\tlong info;\n";
+    Result += "\tlong instance_size;\n";
+    Result += "\tstruct _objc_ivar_list *ivars;\n";
+    Result += "\tstruct _objc_method_list *methods;\n";
+    Result += "\tstruct objc_cache *cache;\n";
+    Result += "\tstruct _objc_protocol_list *protocols;\n";
+    Result += "\tconst char *ivar_layout;\n";
+    Result += "\tstruct _objc_class_ext  *ext;\n";
+    Result += "};\n";
+    objc_class = true;
+  }
+
+  // Meta-class metadata generation.
+  ObjCInterfaceDecl *RootClass = 0;
+  ObjCInterfaceDecl *SuperClass = CDecl->getSuperClass();
+  while (SuperClass) {
+    RootClass = SuperClass;
+    SuperClass = SuperClass->getSuperClass();
+  }
+  SuperClass = CDecl->getSuperClass();
+
+  Result += "\nstatic struct _objc_class _OBJC_METACLASS_";
+  Result += CDecl->getNameAsString();
+  Result += " __attribute__ ((used, section (\"__OBJC, __meta_class\")))= "
+  "{\n\t(struct _objc_class *)\"";
+  Result += (RootClass ? RootClass->getNameAsString() : CDecl->getNameAsString());
+  Result += "\"";
+
+  if (SuperClass) {
+    Result += ", \"";
+    Result += SuperClass->getNameAsString();
+    Result += "\", \"";
+    Result += CDecl->getNameAsString();
+    Result += "\"";
+  }
+  else {
+    Result += ", 0, \"";
+    Result += CDecl->getNameAsString();
+    Result += "\"";
+  }
+  // Set 'ivars' field for root class to 0. ObjC1 runtime does not use it.
+  // 'info' field is initialized to CLS_META(2) for metaclass
+  Result += ", 0,2, sizeof(struct _objc_class), 0";
+  if (IDecl->classmeth_begin() != IDecl->classmeth_end()) {
+    Result += "\n\t, (struct _objc_method_list *)&_OBJC_CLASS_METHODS_";
+    Result += IDecl->getNameAsString();
+    Result += "\n";
+  }
+  else
+    Result += ", 0\n";
+  if (CDecl->protocol_begin() != CDecl->protocol_end()) {
+    Result += "\t,0, (struct _objc_protocol_list *)&_OBJC_CLASS_PROTOCOLS_";
+    Result += CDecl->getNameAsString();
+    Result += ",0,0\n";
+  }
+  else
+    Result += "\t,0,0,0,0\n";
+  Result += "};\n";
+
+  // class metadata generation.
+  Result += "\nstatic struct _objc_class _OBJC_CLASS_";
+  Result += CDecl->getNameAsString();
+  Result += " __attribute__ ((used, section (\"__OBJC, __class\")))= "
+            "{\n\t&_OBJC_METACLASS_";
+  Result += CDecl->getNameAsString();
+  if (SuperClass) {
+    Result += ", \"";
+    Result += SuperClass->getNameAsString();
+    Result += "\", \"";
+    Result += CDecl->getNameAsString();
+    Result += "\"";
+  }
+  else {
+    Result += ", 0, \"";
+    Result += CDecl->getNameAsString();
+    Result += "\"";
+  }
+  // 'info' field is initialized to CLS_CLASS(1) for class
+  Result += ", 0,1";
+  if (!ObjCSynthesizedStructs.count(CDecl))
+    Result += ",0";
+  else {
+    // class has size. Must synthesize its size.
+    Result += ",sizeof(struct ";
+    Result += CDecl->getNameAsString();
+    if (LangOpts.Microsoft)
+      Result += "_IMPL";
+    Result += ")";
+  }
+  if (NumIvars > 0) {
+    Result += ", (struct _objc_ivar_list *)&_OBJC_INSTANCE_VARIABLES_";
+    Result += CDecl->getNameAsString();
+    Result += "\n\t";
+  }
+  else
+    Result += ",0";
+  if (IDecl->instmeth_begin() != IDecl->instmeth_end()) {
+    Result += ", (struct _objc_method_list *)&_OBJC_INSTANCE_METHODS_";
+    Result += CDecl->getNameAsString();
+    Result += ", 0\n\t";
+  }
+  else
+    Result += ",0,0";
+  if (CDecl->protocol_begin() != CDecl->protocol_end()) {
+    Result += ", (struct _objc_protocol_list*)&_OBJC_CLASS_PROTOCOLS_";
+    Result += CDecl->getNameAsString();
+    Result += ", 0,0\n";
+  }
+  else
+    Result += ",0,0,0\n";
+  Result += "};\n";
+}
+
+/// RewriteImplementations - This routine rewrites all method implementations
+/// and emits meta-data.
+
+void RewriteObjC::RewriteImplementations() {
+  int ClsDefCount = ClassImplementation.size();
+  int CatDefCount = CategoryImplementation.size();
+
+  // Rewrite implemented methods
+  for (int i = 0; i < ClsDefCount; i++)
+    RewriteImplementationDecl(ClassImplementation[i]);
+
+  for (int i = 0; i < CatDefCount; i++)
+    RewriteImplementationDecl(CategoryImplementation[i]);
+}
+
+void RewriteObjC::SynthesizeMetaDataIntoBuffer(std::string &Result) {
+  int ClsDefCount = ClassImplementation.size();
+  int CatDefCount = CategoryImplementation.size();
+  
+  // For each implemented class, write out all its meta data.
+  for (int i = 0; i < ClsDefCount; i++)
+    RewriteObjCClassMetaData(ClassImplementation[i], Result);
+
+  // For each implemented category, write out all its meta data.
+  for (int i = 0; i < CatDefCount; i++)
+    RewriteObjCCategoryImplDecl(CategoryImplementation[i], Result);
+
+  // Write objc_symtab metadata
+  /*
+   struct _objc_symtab
+   {
+   long sel_ref_cnt;
+   SEL *refs;
+   short cls_def_cnt;
+   short cat_def_cnt;
+   void *defs[cls_def_cnt + cat_def_cnt];
+   };
+   */
+
+  Result += "\nstruct _objc_symtab {\n";
+  Result += "\tlong sel_ref_cnt;\n";
+  Result += "\tSEL *refs;\n";
+  Result += "\tshort cls_def_cnt;\n";
+  Result += "\tshort cat_def_cnt;\n";
+  Result += "\tvoid *defs[" + utostr(ClsDefCount + CatDefCount)+ "];\n";
+  Result += "};\n\n";
+
+  Result += "static struct _objc_symtab "
+         "_OBJC_SYMBOLS __attribute__((used, section (\"__OBJC, __symbols\")))= {\n";
+  Result += "\t0, 0, " + utostr(ClsDefCount)
+            + ", " + utostr(CatDefCount) + "\n";
+  for (int i = 0; i < ClsDefCount; i++) {
+    Result += "\t,&_OBJC_CLASS_";
+    Result += ClassImplementation[i]->getNameAsString();
+    Result += "\n";
+  }
+
+  for (int i = 0; i < CatDefCount; i++) {
+    Result += "\t,&_OBJC_CATEGORY_";
+    Result += CategoryImplementation[i]->getClassInterface()->getNameAsString();
+    Result += "_";
+    Result += CategoryImplementation[i]->getNameAsString();
+    Result += "\n";
+  }
+
+  Result += "};\n\n";
+
+  // Write objc_module metadata
+
+  /*
+   struct _objc_module {
+    long version;
+    long size;
+    const char *name;
+    struct _objc_symtab *symtab;
+   }
+  */
+
+  Result += "\nstruct _objc_module {\n";
+  Result += "\tlong version;\n";
+  Result += "\tlong size;\n";
+  Result += "\tconst char *name;\n";
+  Result += "\tstruct _objc_symtab *symtab;\n";
+  Result += "};\n\n";
+  Result += "static struct _objc_module "
+    "_OBJC_MODULES __attribute__ ((used, section (\"__OBJC, __module_info\")))= {\n";
+  Result += "\t" + utostr(OBJC_ABI_VERSION) +
+  ", sizeof(struct _objc_module), \"\", &_OBJC_SYMBOLS\n";
+  Result += "};\n\n";
+
+  if (LangOpts.Microsoft) {
+    if (ProtocolExprDecls.size()) {
+      Result += "#pragma section(\".objc_protocol$B\",long,read,write)\n";
+      Result += "#pragma data_seg(push, \".objc_protocol$B\")\n";
+      for (llvm::SmallPtrSet<ObjCProtocolDecl *,8>::iterator I = ProtocolExprDecls.begin(),
+           E = ProtocolExprDecls.end(); I != E; ++I) {
+        Result += "static struct _objc_protocol *_POINTER_OBJC_PROTOCOL_";
+        Result += (*I)->getNameAsString();
+        Result += " = &_OBJC_PROTOCOL_";
+        Result += (*I)->getNameAsString();
+        Result += ";\n";
+      }
+      Result += "#pragma data_seg(pop)\n\n";
+    }
+    Result += "#pragma section(\".objc_module_info$B\",long,read,write)\n";
+    Result += "#pragma data_seg(push, \".objc_module_info$B\")\n";
+    Result += "static struct _objc_module *_POINTER_OBJC_MODULES = ";
+    Result += "&_OBJC_MODULES;\n";
+    Result += "#pragma data_seg(pop)\n\n";
+  }
+}
+
+void RewriteObjC::RewriteByRefString(std::string &ResultStr, 
+                                     const std::string &Name,
+                                     ValueDecl *VD, bool def) {
+  assert(BlockByRefDeclNo.count(VD) && 
+         "RewriteByRefString: ByRef decl missing");
+  if (def)
+    ResultStr += "struct ";
+  ResultStr += "__Block_byref_" + Name + 
+    "_" + utostr(BlockByRefDeclNo[VD]) ;
+}
+
+static bool HasLocalVariableExternalStorage(ValueDecl *VD) {
+  if (VarDecl *Var = dyn_cast<VarDecl>(VD))
+    return (Var->isFunctionOrMethodVarDecl() && !Var->hasLocalStorage());
+  return false;
+}
+
+std::string RewriteObjC::SynthesizeBlockFunc(BlockExpr *CE, int i,
+                                                   llvm::StringRef funcName,
+                                                   std::string Tag) {
+  const FunctionType *AFT = CE->getFunctionType();
+  QualType RT = AFT->getResultType();
+  std::string StructRef = "struct " + Tag;
+  std::string S = "static " + RT.getAsString(Context->PrintingPolicy) + " __" +
+                  funcName.str() + "_" + "block_func_" + utostr(i);
+
+  BlockDecl *BD = CE->getBlockDecl();
+
+  if (isa<FunctionNoProtoType>(AFT)) {
+    // No user-supplied arguments. Still need to pass in a pointer to the
+    // block (to reference imported block decl refs).
+    S += "(" + StructRef + " *__cself)";
+  } else if (BD->param_empty()) {
+    S += "(" + StructRef + " *__cself)";
+  } else {
+    const FunctionProtoType *FT = cast<FunctionProtoType>(AFT);
+    assert(FT && "SynthesizeBlockFunc: No function proto");
+    S += '(';
+    // first add the implicit argument.
+    S += StructRef + " *__cself, ";
+    std::string ParamStr;
+    for (BlockDecl::param_iterator AI = BD->param_begin(),
+         E = BD->param_end(); AI != E; ++AI) {
+      if (AI != BD->param_begin()) S += ", ";
+      ParamStr = (*AI)->getNameAsString();
+      QualType QT = (*AI)->getType();
+      if (convertBlockPointerToFunctionPointer(QT))
+        QT.getAsStringInternal(ParamStr, Context->PrintingPolicy);
+      else
+        QT.getAsStringInternal(ParamStr, Context->PrintingPolicy);      
+      S += ParamStr;
+    }
+    if (FT->isVariadic()) {
+      if (!BD->param_empty()) S += ", ";
+      S += "...";
+    }
+    S += ')';
+  }
+  S += " {\n";
+
+  // Create local declarations to avoid rewriting all closure decl ref exprs.
+  // First, emit a declaration for all "by ref" decls.
+  for (llvm::SmallVector<ValueDecl*,8>::iterator I = BlockByRefDecls.begin(),
+       E = BlockByRefDecls.end(); I != E; ++I) {
+    S += "  ";
+    std::string Name = (*I)->getNameAsString();
+    std::string TypeString;
+    RewriteByRefString(TypeString, Name, (*I));
+    TypeString += " *";
+    Name = TypeString + Name;
+    S += Name + " = __cself->" + (*I)->getNameAsString() + "; // bound by ref\n";
+  }
+  // Next, emit a declaration for all "by copy" declarations.
+  for (llvm::SmallVector<ValueDecl*,8>::iterator I = BlockByCopyDecls.begin(),
+       E = BlockByCopyDecls.end(); I != E; ++I) {
+    S += "  ";
+    // Handle nested closure invocation. For example:
+    //
+    //   void (^myImportedClosure)(void);
+    //   myImportedClosure  = ^(void) { setGlobalInt(x + y); };
+    //
+    //   void (^anotherClosure)(void);
+    //   anotherClosure = ^(void) {
+    //     myImportedClosure(); // import and invoke the closure
+    //   };
+    //
+    if (isTopLevelBlockPointerType((*I)->getType())) {
+      RewriteBlockPointerTypeVariable(S, (*I));
+      S += " = (";
+      RewriteBlockPointerType(S, (*I)->getType());
+      S += ")";
+      S += "__cself->" + (*I)->getNameAsString() + "; // bound by copy\n";
+    }
+    else {
+      std::string Name = (*I)->getNameAsString();
+      QualType QT = (*I)->getType();
+      if (HasLocalVariableExternalStorage(*I))
+        QT = Context->getPointerType(QT);
+      QT.getAsStringInternal(Name, Context->PrintingPolicy);
+      S += Name + " = __cself->" + 
+                              (*I)->getNameAsString() + "; // bound by copy\n";
+    }
+  }
+  std::string RewrittenStr = RewrittenBlockExprs[CE];
+  const char *cstr = RewrittenStr.c_str();
+  while (*cstr++ != '{') ;
+  S += cstr;
+  S += "\n";
+  return S;
+}
+
+std::string RewriteObjC::SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
+                                                   llvm::StringRef funcName,
+                                                   std::string Tag) {
+  std::string StructRef = "struct " + Tag;
+  std::string S = "static void __";
+
+  S += funcName;
+  S += "_block_copy_" + utostr(i);
+  S += "(" + StructRef;
+  S += "*dst, " + StructRef;
+  S += "*src) {";
+  for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = ImportedBlockDecls.begin(),
+      E = ImportedBlockDecls.end(); I != E; ++I) {
+    S += "_Block_object_assign((void*)&dst->";
+    S += (*I)->getNameAsString();
+    S += ", (void*)src->";
+    S += (*I)->getNameAsString();
+    if (BlockByRefDeclsPtrSet.count((*I)))
+      S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
+    else
+      S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
+  }
+  S += "}\n";
+  
+  S += "\nstatic void __";
+  S += funcName;
+  S += "_block_dispose_" + utostr(i);
+  S += "(" + StructRef;
+  S += "*src) {";
+  for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = ImportedBlockDecls.begin(),
+      E = ImportedBlockDecls.end(); I != E; ++I) {
+    S += "_Block_object_dispose((void*)src->";
+    S += (*I)->getNameAsString();
+    if (BlockByRefDeclsPtrSet.count((*I)))
+      S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
+    else
+      S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
+  }
+  S += "}\n";
+  return S;
+}
+
+std::string RewriteObjC::SynthesizeBlockImpl(BlockExpr *CE, std::string Tag, 
+                                             std::string Desc) {
+  std::string S = "\nstruct " + Tag;
+  std::string Constructor = "  " + Tag;
+
+  S += " {\n  struct __block_impl impl;\n";
+  S += "  struct " + Desc;
+  S += "* Desc;\n";
+
+  Constructor += "(void *fp, "; // Invoke function pointer.
+  Constructor += "struct " + Desc; // Descriptor pointer.
+  Constructor += " *desc";
+
+  if (BlockDeclRefs.size()) {
+    // Output all "by copy" declarations.
+    for (llvm::SmallVector<ValueDecl*,8>::iterator I = BlockByCopyDecls.begin(),
+         E = BlockByCopyDecls.end(); I != E; ++I) {
+      S += "  ";
+      std::string FieldName = (*I)->getNameAsString();
+      std::string ArgName = "_" + FieldName;
+      // Handle nested closure invocation. For example:
+      //
+      //   void (^myImportedBlock)(void);
+      //   myImportedBlock  = ^(void) { setGlobalInt(x + y); };
+      //
+      //   void (^anotherBlock)(void);
+      //   anotherBlock = ^(void) {
+      //     myImportedBlock(); // import and invoke the closure
+      //   };
+      //
+      if (isTopLevelBlockPointerType((*I)->getType())) {
+        S += "struct __block_impl *";
+        Constructor += ", void *" + ArgName;
+      } else {
+        QualType QT = (*I)->getType();
+        if (HasLocalVariableExternalStorage(*I))
+          QT = Context->getPointerType(QT);
+        QT.getAsStringInternal(FieldName, Context->PrintingPolicy);
+        QT.getAsStringInternal(ArgName, Context->PrintingPolicy);
+        Constructor += ", " + ArgName;
+      }
+      S += FieldName + ";\n";
+    }
+    // Output all "by ref" declarations.
+    for (llvm::SmallVector<ValueDecl*,8>::iterator I = BlockByRefDecls.begin(),
+         E = BlockByRefDecls.end(); I != E; ++I) {
+      S += "  ";
+      std::string FieldName = (*I)->getNameAsString();
+      std::string ArgName = "_" + FieldName;
+      {
+        std::string TypeString;
+        RewriteByRefString(TypeString, FieldName, (*I));
+        TypeString += " *";
+        FieldName = TypeString + FieldName;
+        ArgName = TypeString + ArgName;
+        Constructor += ", " + ArgName;
+      }
+      S += FieldName + "; // by ref\n";
+    }
+    // Finish writing the constructor.
+    Constructor += ", int flags=0)";
+    // Initialize all "by copy" arguments.
+    bool firsTime = true;
+    for (llvm::SmallVector<ValueDecl*,8>::iterator I = BlockByCopyDecls.begin(),
+         E = BlockByCopyDecls.end(); I != E; ++I) {
+      std::string Name = (*I)->getNameAsString();
+        if (firsTime) {
+          Constructor += " : ";
+          firsTime = false;
+        }
+        else
+          Constructor += ", ";
+        if (isTopLevelBlockPointerType((*I)->getType()))
+          Constructor += Name + "((struct __block_impl *)_" + Name + ")";
+        else
+          Constructor += Name + "(_" + Name + ")";
+    }
+    // Initialize all "by ref" arguments.
+    for (llvm::SmallVector<ValueDecl*,8>::iterator I = BlockByRefDecls.begin(),
+         E = BlockByRefDecls.end(); I != E; ++I) {
+      std::string Name = (*I)->getNameAsString();
+      if (firsTime) {
+        Constructor += " : ";
+        firsTime = false;
+      }
+      else
+        Constructor += ", ";
+      Constructor += Name + "(_" + Name + "->__forwarding)";
+    }
+    
+    Constructor += " {\n";
+    if (GlobalVarDecl)
+      Constructor += "    impl.isa = &_NSConcreteGlobalBlock;\n";
+    else
+      Constructor += "    impl.isa = &_NSConcreteStackBlock;\n";
+    Constructor += "    impl.Flags = flags;\n    impl.FuncPtr = fp;\n";
+
+    Constructor += "    Desc = desc;\n";
+  } else {
+    // Finish writing the constructor.
+    Constructor += ", int flags=0) {\n";
+    if (GlobalVarDecl)
+      Constructor += "    impl.isa = &_NSConcreteGlobalBlock;\n";
+    else
+      Constructor += "    impl.isa = &_NSConcreteStackBlock;\n";
+    Constructor += "    impl.Flags = flags;\n    impl.FuncPtr = fp;\n";
+    Constructor += "    Desc = desc;\n";
+  }
+  Constructor += "  ";
+  Constructor += "}\n";
+  S += Constructor;
+  S += "};\n";
+  return S;
+}
+
+std::string RewriteObjC::SynthesizeBlockDescriptor(std::string DescTag, 
+                                                   std::string ImplTag, int i,
+                                                   llvm::StringRef FunName,
+                                                   unsigned hasCopy) {
+  std::string S = "\nstatic struct " + DescTag;
+  
+  S += " {\n  unsigned long reserved;\n";
+  S += "  unsigned long Block_size;\n";
+  if (hasCopy) {
+    S += "  void (*copy)(struct ";
+    S += ImplTag; S += "*, struct ";
+    S += ImplTag; S += "*);\n";
+    
+    S += "  void (*dispose)(struct ";
+    S += ImplTag; S += "*);\n";
+  }
+  S += "} ";
+
+  S += DescTag + "_DATA = { 0, sizeof(struct ";
+  S += ImplTag + ")";
+  if (hasCopy) {
+    S += ", __" + FunName.str() + "_block_copy_" + utostr(i);
+    S += ", __" + FunName.str() + "_block_dispose_" + utostr(i);
+  }
+  S += "};\n";
+  return S;
+}
+
+void RewriteObjC::SynthesizeBlockLiterals(SourceLocation FunLocStart,
+                                          llvm::StringRef FunName) {
+  // Insert declaration for the function in which block literal is used.
+  if (CurFunctionDeclToDeclareForBlock && !Blocks.empty())
+    RewriteBlockLiteralFunctionDecl(CurFunctionDeclToDeclareForBlock);
+  bool RewriteSC = (GlobalVarDecl &&
+                    !Blocks.empty() &&
+                    GlobalVarDecl->getStorageClass() == SC_Static &&
+                    GlobalVarDecl->getType().getCVRQualifiers());
+  if (RewriteSC) {
+    std::string SC(" void __");
+    SC += GlobalVarDecl->getNameAsString();
+    SC += "() {}";
+    InsertText(FunLocStart, SC);
+  }
+  
+  // Insert closures that were part of the function.
+  for (unsigned i = 0, count=0; i < Blocks.size(); i++) {
+    CollectBlockDeclRefInfo(Blocks[i]);
+    // Need to copy-in the inner copied-in variables not actually used in this
+    // block.
+    for (int j = 0; j < InnerDeclRefsCount[i]; j++) {
+      BlockDeclRefExpr *Exp = InnerDeclRefs[count++];
+      ValueDecl *VD = Exp->getDecl();
+      BlockDeclRefs.push_back(Exp);
+      if (!Exp->isByRef() && !BlockByCopyDeclsPtrSet.count(VD)) {
+        BlockByCopyDeclsPtrSet.insert(VD);
+        BlockByCopyDecls.push_back(VD);
+      }
+      if (Exp->isByRef() && !BlockByRefDeclsPtrSet.count(VD)) {
+        BlockByRefDeclsPtrSet.insert(VD);
+        BlockByRefDecls.push_back(VD);
+      }
+      // imported objects in the inner blocks not used in the outer
+      // blocks must be copied/disposed in the outer block as well.
+      if (Exp->isByRef() ||
+          VD->getType()->isObjCObjectPointerType() || 
+          VD->getType()->isBlockPointerType())
+        ImportedBlockDecls.insert(VD);
+    }
+
+    std::string ImplTag = "__" + FunName.str() + "_block_impl_" + utostr(i);
+    std::string DescTag = "__" + FunName.str() + "_block_desc_" + utostr(i);
+
+    std::string CI = SynthesizeBlockImpl(Blocks[i], ImplTag, DescTag);
+
+    InsertText(FunLocStart, CI);
+
+    std::string CF = SynthesizeBlockFunc(Blocks[i], i, FunName, ImplTag);
+
+    InsertText(FunLocStart, CF);
+
+    if (ImportedBlockDecls.size()) {
+      std::string HF = SynthesizeBlockHelperFuncs(Blocks[i], i, FunName, ImplTag);
+      InsertText(FunLocStart, HF);
+    }
+    std::string BD = SynthesizeBlockDescriptor(DescTag, ImplTag, i, FunName,
+                                               ImportedBlockDecls.size() > 0);
+    InsertText(FunLocStart, BD);
+
+    BlockDeclRefs.clear();
+    BlockByRefDecls.clear();
+    BlockByRefDeclsPtrSet.clear();
+    BlockByCopyDecls.clear();
+    BlockByCopyDeclsPtrSet.clear();
+    ImportedBlockDecls.clear();
+  }
+  if (RewriteSC) {
+    // Must insert any 'const/volatile/static here. Since it has been
+    // removed as result of rewriting of block literals.
+    std::string SC;
+    if (GlobalVarDecl->getStorageClass() == SC_Static)
+      SC = "static ";
+    if (GlobalVarDecl->getType().isConstQualified())
+      SC += "const ";
+    if (GlobalVarDecl->getType().isVolatileQualified())
+      SC += "volatile ";
+    if (GlobalVarDecl->getType().isRestrictQualified())
+      SC += "restrict ";
+    InsertText(FunLocStart, SC);
+  }
+  
+  Blocks.clear();
+  InnerDeclRefsCount.clear();
+  InnerDeclRefs.clear();
+  RewrittenBlockExprs.clear();
+}
+
+void RewriteObjC::InsertBlockLiteralsWithinFunction(FunctionDecl *FD) {
+  SourceLocation FunLocStart = FD->getTypeSpecStartLoc();
+  llvm::StringRef FuncName = FD->getName();
+
+  SynthesizeBlockLiterals(FunLocStart, FuncName);
+}
+
+static void BuildUniqueMethodName(std::string &Name,
+                                  ObjCMethodDecl *MD) {
+  ObjCInterfaceDecl *IFace = MD->getClassInterface();
+  Name = IFace->getName();
+  Name += "__" + MD->getSelector().getAsString();
+  // Convert colons to underscores.
+  std::string::size_type loc = 0;
+  while ((loc = Name.find(":", loc)) != std::string::npos)
+    Name.replace(loc, 1, "_");
+}
+
+void RewriteObjC::InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD) {
+  //fprintf(stderr,"In InsertBlockLiteralsWitinMethod\n");
+  //SourceLocation FunLocStart = MD->getLocStart();
+  SourceLocation FunLocStart = MD->getLocStart();
+  std::string FuncName;
+  BuildUniqueMethodName(FuncName, MD);
+  SynthesizeBlockLiterals(FunLocStart, FuncName);
+}
+
+void RewriteObjC::GetBlockDeclRefExprs(Stmt *S) {
+  for (Stmt::child_range CI = S->children(); CI; ++CI)
+    if (*CI) {
+      if (BlockExpr *CBE = dyn_cast<BlockExpr>(*CI))
+        GetBlockDeclRefExprs(CBE->getBody());
+      else
+        GetBlockDeclRefExprs(*CI);
+    }
+  // Handle specific things.
+  if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(S)) {
+    // FIXME: Handle enums.
+    if (!isa<FunctionDecl>(CDRE->getDecl()))
+      BlockDeclRefs.push_back(CDRE);
+  }
+  else if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S))
+    if (HasLocalVariableExternalStorage(DRE->getDecl())) {
+        BlockDeclRefExpr *BDRE = 
+          new (Context)BlockDeclRefExpr(cast<VarDecl>(DRE->getDecl()),
+                                        DRE->getType(), 
+                                        VK_LValue, DRE->getLocation(), false);
+        BlockDeclRefs.push_back(BDRE);
+    }
+  
+  return;
+}
+
+void RewriteObjC::GetInnerBlockDeclRefExprs(Stmt *S, 
+                llvm::SmallVector<BlockDeclRefExpr *, 8> &InnerBlockDeclRefs,
+                llvm::SmallPtrSet<const DeclContext *, 8> &InnerContexts) {
+  for (Stmt::child_range CI = S->children(); CI; ++CI)
+    if (*CI) {
+      if (BlockExpr *CBE = dyn_cast<BlockExpr>(*CI)) {
+        InnerContexts.insert(cast<DeclContext>(CBE->getBlockDecl()));
+        GetInnerBlockDeclRefExprs(CBE->getBody(),
+                                  InnerBlockDeclRefs,
+                                  InnerContexts);
+      }
+      else
+        GetInnerBlockDeclRefExprs(*CI,
+                                  InnerBlockDeclRefs,
+                                  InnerContexts);
+
+    }
+  // Handle specific things.
+  if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(S)) {
+    if (!isa<FunctionDecl>(CDRE->getDecl()) &&
+        !InnerContexts.count(CDRE->getDecl()->getDeclContext()))
+      InnerBlockDeclRefs.push_back(CDRE);
+  }
+  else if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
+    if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl()))
+      if (Var->isFunctionOrMethodVarDecl())
+        ImportedLocalExternalDecls.insert(Var);
+  }
+  
+  return;
+}
+
+/// convertFunctionTypeOfBlocks - This routine converts a function type
+/// whose result type may be a block pointer or whose argument type(s)
+/// might be block pointers to an equivalent function type replacing
+/// all block pointers to function pointers.
+QualType RewriteObjC::convertFunctionTypeOfBlocks(const FunctionType *FT) {
+  const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
+  // FTP will be null for closures that don't take arguments.
+  // Generate a funky cast.
+  llvm::SmallVector<QualType, 8> ArgTypes;
+  QualType Res = FT->getResultType();
+  bool HasBlockType = convertBlockPointerToFunctionPointer(Res);
+  
+  if (FTP) {
+    for (FunctionProtoType::arg_type_iterator I = FTP->arg_type_begin(),
+         E = FTP->arg_type_end(); I && (I != E); ++I) {
+      QualType t = *I;
+      // Make sure we convert "t (^)(...)" to "t (*)(...)".
+      if (convertBlockPointerToFunctionPointer(t))
+        HasBlockType = true;
+      ArgTypes.push_back(t);
+    }
+  }
+  QualType FuncType;
+  // FIXME. Does this work if block takes no argument but has a return type
+  // which is of block type?
+  if (HasBlockType)
+    FuncType = getSimpleFunctionType(Res, &ArgTypes[0], ArgTypes.size());
+  else FuncType = QualType(FT, 0);
+  return FuncType;
+}
+
+Stmt *RewriteObjC::SynthesizeBlockCall(CallExpr *Exp, const Expr *BlockExp) {
+  // Navigate to relevant type information.
+  const BlockPointerType *CPT = 0;
+
+  if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BlockExp)) {
+    CPT = DRE->getType()->getAs<BlockPointerType>();
+  } else if (const BlockDeclRefExpr *CDRE = 
+              dyn_cast<BlockDeclRefExpr>(BlockExp)) {
+    CPT = CDRE->getType()->getAs<BlockPointerType>();
+  } else if (const MemberExpr *MExpr = dyn_cast<MemberExpr>(BlockExp)) {
+    CPT = MExpr->getType()->getAs<BlockPointerType>();
+  } 
+  else if (const ParenExpr *PRE = dyn_cast<ParenExpr>(BlockExp)) {
+    return SynthesizeBlockCall(Exp, PRE->getSubExpr());
+  }
+  else if (const ImplicitCastExpr *IEXPR = dyn_cast<ImplicitCastExpr>(BlockExp)) 
+    CPT = IEXPR->getType()->getAs<BlockPointerType>();
+  else if (const ConditionalOperator *CEXPR = 
+            dyn_cast<ConditionalOperator>(BlockExp)) {
+    Expr *LHSExp = CEXPR->getLHS();
+    Stmt *LHSStmt = SynthesizeBlockCall(Exp, LHSExp);
+    Expr *RHSExp = CEXPR->getRHS();
+    Stmt *RHSStmt = SynthesizeBlockCall(Exp, RHSExp);
+    Expr *CONDExp = CEXPR->getCond();
+    ConditionalOperator *CondExpr =
+      new (Context) ConditionalOperator(CONDExp,
+                                      SourceLocation(), cast<Expr>(LHSStmt),
+                                      SourceLocation(), cast<Expr>(RHSStmt),
+                                      Exp->getType(), VK_RValue, OK_Ordinary);
+    return CondExpr;
+  } else if (const ObjCIvarRefExpr *IRE = dyn_cast<ObjCIvarRefExpr>(BlockExp)) {
+    CPT = IRE->getType()->getAs<BlockPointerType>();
+  } else {
+    assert(1 && "RewriteBlockClass: Bad type");
+  }
+  assert(CPT && "RewriteBlockClass: Bad type");
+  const FunctionType *FT = CPT->getPointeeType()->getAs<FunctionType>();
+  assert(FT && "RewriteBlockClass: Bad type");
+  const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
+  // FTP will be null for closures that don't take arguments.
+
+  RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                      SourceLocation(), SourceLocation(),
+                                      &Context->Idents.get("__block_impl"));
+  QualType PtrBlock = Context->getPointerType(Context->getTagDeclType(RD));
+
+  // Generate a funky cast.
+  llvm::SmallVector<QualType, 8> ArgTypes;
+
+  // Push the block argument type.
+  ArgTypes.push_back(PtrBlock);
+  if (FTP) {
+    for (FunctionProtoType::arg_type_iterator I = FTP->arg_type_begin(),
+         E = FTP->arg_type_end(); I && (I != E); ++I) {
+      QualType t = *I;
+      // Make sure we convert "t (^)(...)" to "t (*)(...)".
+      if (!convertBlockPointerToFunctionPointer(t))
+        convertToUnqualifiedObjCType(t);
+      ArgTypes.push_back(t);
+    }
+  }
+  // Now do the pointer to function cast.
+  QualType PtrToFuncCastType
+    = getSimpleFunctionType(Exp->getType(), &ArgTypes[0], ArgTypes.size());
+
+  PtrToFuncCastType = Context->getPointerType(PtrToFuncCastType);
+
+  CastExpr *BlkCast = NoTypeInfoCStyleCastExpr(Context, PtrBlock,
+                                               CK_BitCast,
+                                               const_cast<Expr*>(BlockExp));
+  // Don't forget the parens to enforce the proper binding.
+  ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
+                                          BlkCast);
+  //PE->dump();
+
+  FieldDecl *FD = FieldDecl::Create(*Context, 0, SourceLocation(),
+                                    SourceLocation(),
+                                    &Context->Idents.get("FuncPtr"),
+                                    Context->VoidPtrTy, 0,
+                                    /*BitWidth=*/0, /*Mutable=*/true);
+  MemberExpr *ME = new (Context) MemberExpr(PE, true, FD, SourceLocation(),
+                                            FD->getType(), VK_LValue,
+                                            OK_Ordinary);
+
+  
+  CastExpr *FunkCast = NoTypeInfoCStyleCastExpr(Context, PtrToFuncCastType,
+                                                CK_BitCast, ME);
+  PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), FunkCast);
+
+  llvm::SmallVector<Expr*, 8> BlkExprs;
+  // Add the implicit argument.
+  BlkExprs.push_back(BlkCast);
+  // Add the user arguments.
+  for (CallExpr::arg_iterator I = Exp->arg_begin(),
+       E = Exp->arg_end(); I != E; ++I) {
+    BlkExprs.push_back(*I);
+  }
+  CallExpr *CE = new (Context) CallExpr(*Context, PE, &BlkExprs[0],
+                                        BlkExprs.size(),
+                                        Exp->getType(), VK_RValue,
+                                        SourceLocation());
+  return CE;
+}
+
+// We need to return the rewritten expression to handle cases where the
+// BlockDeclRefExpr is embedded in another expression being rewritten.
+// For example:
+//
+// int main() {
+//    __block Foo *f;
+//    __block int i;
+//
+//    void (^myblock)() = ^() {
+//        [f test]; // f is a BlockDeclRefExpr embedded in a message (which is being rewritten).
+//        i = 77;
+//    };
+//}
+Stmt *RewriteObjC::RewriteBlockDeclRefExpr(Expr *DeclRefExp) {
+  // Rewrite the byref variable into BYREFVAR->__forwarding->BYREFVAR 
+  // for each DeclRefExp where BYREFVAR is name of the variable.
+  ValueDecl *VD;
+  bool isArrow = true;
+  if (BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(DeclRefExp))
+    VD = BDRE->getDecl();
+  else {
+    VD = cast<DeclRefExpr>(DeclRefExp)->getDecl();
+    isArrow = false;
+  }
+  
+  FieldDecl *FD = FieldDecl::Create(*Context, 0, SourceLocation(),
+                                    SourceLocation(),
+                                    &Context->Idents.get("__forwarding"), 
+                                    Context->VoidPtrTy, 0,
+                                    /*BitWidth=*/0, /*Mutable=*/true);
+  MemberExpr *ME = new (Context) MemberExpr(DeclRefExp, isArrow,
+                                            FD, SourceLocation(),
+                                            FD->getType(), VK_LValue,
+                                            OK_Ordinary);
+
+  llvm::StringRef Name = VD->getName();
+  FD = FieldDecl::Create(*Context, 0, SourceLocation(), SourceLocation(),
+                         &Context->Idents.get(Name), 
+                         Context->VoidPtrTy, 0,
+                         /*BitWidth=*/0, /*Mutable=*/true);
+  ME = new (Context) MemberExpr(ME, true, FD, SourceLocation(),
+                                DeclRefExp->getType(), VK_LValue, OK_Ordinary);
+  
+  
+  
+  // Need parens to enforce precedence.
+  ParenExpr *PE = new (Context) ParenExpr(DeclRefExp->getExprLoc(), 
+                                          DeclRefExp->getExprLoc(), 
+                                          ME);
+  ReplaceStmt(DeclRefExp, PE);
+  return PE;
+}
+
+// Rewrites the imported local variable V with external storage 
+// (static, extern, etc.) as *V
+//
+Stmt *RewriteObjC::RewriteLocalVariableExternalStorage(DeclRefExpr *DRE) {
+  ValueDecl *VD = DRE->getDecl();
+  if (VarDecl *Var = dyn_cast<VarDecl>(VD))
+    if (!ImportedLocalExternalDecls.count(Var))
+      return DRE;
+  Expr *Exp = new (Context) UnaryOperator(DRE, UO_Deref, DRE->getType(),
+                                          VK_LValue, OK_Ordinary,
+                                          DRE->getLocation());
+  // Need parens to enforce precedence.
+  ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), 
+                                          Exp);
+  ReplaceStmt(DRE, PE);
+  return PE;
+}
+
+void RewriteObjC::RewriteCastExpr(CStyleCastExpr *CE) {
+  SourceLocation LocStart = CE->getLParenLoc();
+  SourceLocation LocEnd = CE->getRParenLoc();
+
+  // Need to avoid trying to rewrite synthesized casts.
+  if (LocStart.isInvalid())
+    return;
+  // Need to avoid trying to rewrite casts contained in macros.
+  if (!Rewriter::isRewritable(LocStart) || !Rewriter::isRewritable(LocEnd))
+    return;
+
+  const char *startBuf = SM->getCharacterData(LocStart);
+  const char *endBuf = SM->getCharacterData(LocEnd);
+  QualType QT = CE->getType();
+  const Type* TypePtr = QT->getAs<Type>();
+  if (isa<TypeOfExprType>(TypePtr)) {
+    const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
+    QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
+    std::string TypeAsString = "(";
+    RewriteBlockPointerType(TypeAsString, QT);
+    TypeAsString += ")";
+    ReplaceText(LocStart, endBuf-startBuf+1, TypeAsString);
+    return;
+  }
+  // advance the location to startArgList.
+  const char *argPtr = startBuf;
+
+  while (*argPtr++ && (argPtr < endBuf)) {
+    switch (*argPtr) {
+    case '^':
+      // Replace the '^' with '*'.
+      LocStart = LocStart.getFileLocWithOffset(argPtr-startBuf);
+      ReplaceText(LocStart, 1, "*");
+      break;
+    }
+  }
+  return;
+}
+
+void RewriteObjC::RewriteBlockPointerFunctionArgs(FunctionDecl *FD) {
+  SourceLocation DeclLoc = FD->getLocation();
+  unsigned parenCount = 0;
+
+  // We have 1 or more arguments that have closure pointers.
+  const char *startBuf = SM->getCharacterData(DeclLoc);
+  const char *startArgList = strchr(startBuf, '(');
+
+  assert((*startArgList == '(') && "Rewriter fuzzy parser confused");
+
+  parenCount++;
+  // advance the location to startArgList.
+  DeclLoc = DeclLoc.getFileLocWithOffset(startArgList-startBuf);
+  assert((DeclLoc.isValid()) && "Invalid DeclLoc");
+
+  const char *argPtr = startArgList;
+
+  while (*argPtr++ && parenCount) {
+    switch (*argPtr) {
+    case '^':
+      // Replace the '^' with '*'.
+      DeclLoc = DeclLoc.getFileLocWithOffset(argPtr-startArgList);
+      ReplaceText(DeclLoc, 1, "*");
+      break;
+    case '(':
+      parenCount++;
+      break;
+    case ')':
+      parenCount--;
+      break;
+    }
+  }
+  return;
+}
+
+bool RewriteObjC::PointerTypeTakesAnyBlockArguments(QualType QT) {
+  const FunctionProtoType *FTP;
+  const PointerType *PT = QT->getAs<PointerType>();
+  if (PT) {
+    FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
+  } else {
+    const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
+    assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
+    FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
+  }
+  if (FTP) {
+    for (FunctionProtoType::arg_type_iterator I = FTP->arg_type_begin(),
+         E = FTP->arg_type_end(); I != E; ++I)
+      if (isTopLevelBlockPointerType(*I))
+        return true;
+  }
+  return false;
+}
+
+bool RewriteObjC::PointerTypeTakesAnyObjCQualifiedType(QualType QT) {
+  const FunctionProtoType *FTP;
+  const PointerType *PT = QT->getAs<PointerType>();
+  if (PT) {
+    FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
+  } else {
+    const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
+    assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
+    FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
+  }
+  if (FTP) {
+    for (FunctionProtoType::arg_type_iterator I = FTP->arg_type_begin(),
+         E = FTP->arg_type_end(); I != E; ++I) {
+      if ((*I)->isObjCQualifiedIdType())
+        return true;
+      if ((*I)->isObjCObjectPointerType() &&
+          (*I)->getPointeeType()->isObjCQualifiedInterfaceType())
+        return true;
+    }
+        
+  }
+  return false;
+}
+
+void RewriteObjC::GetExtentOfArgList(const char *Name, const char *&LParen,
+                                     const char *&RParen) {
+  const char *argPtr = strchr(Name, '(');
+  assert((*argPtr == '(') && "Rewriter fuzzy parser confused");
+
+  LParen = argPtr; // output the start.
+  argPtr++; // skip past the left paren.
+  unsigned parenCount = 1;
+
+  while (*argPtr && parenCount) {
+    switch (*argPtr) {
+    case '(': parenCount++; break;
+    case ')': parenCount--; break;
+    default: break;
+    }
+    if (parenCount) argPtr++;
+  }
+  assert((*argPtr == ')') && "Rewriter fuzzy parser confused");
+  RParen = argPtr; // output the end
+}
+
+void RewriteObjC::RewriteBlockPointerDecl(NamedDecl *ND) {
+  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
+    RewriteBlockPointerFunctionArgs(FD);
+    return;
+  }
+  // Handle Variables and Typedefs.
+  SourceLocation DeclLoc = ND->getLocation();
+  QualType DeclT;
+  if (VarDecl *VD = dyn_cast<VarDecl>(ND))
+    DeclT = VD->getType();
+  else if (TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(ND))
+    DeclT = TDD->getUnderlyingType();
+  else if (FieldDecl *FD = dyn_cast<FieldDecl>(ND))
+    DeclT = FD->getType();
+  else
+    assert(0 && "RewriteBlockPointerDecl(): Decl type not yet handled");
+
+  const char *startBuf = SM->getCharacterData(DeclLoc);
+  const char *endBuf = startBuf;
+  // scan backward (from the decl location) for the end of the previous decl.
+  while (*startBuf != '^' && *startBuf != ';' && startBuf != MainFileStart)
+    startBuf--;
+  SourceLocation Start = DeclLoc.getFileLocWithOffset(startBuf-endBuf);
+  std::string buf;
+  unsigned OrigLength=0;
+  // *startBuf != '^' if we are dealing with a pointer to function that
+  // may take block argument types (which will be handled below).
+  if (*startBuf == '^') {
+    // Replace the '^' with '*', computing a negative offset.
+    buf = '*';
+    startBuf++;
+    OrigLength++;
+  }
+  while (*startBuf != ')') {
+    buf += *startBuf;
+    startBuf++;
+    OrigLength++;
+  }
+  buf += ')';
+  OrigLength++;
+  
+  if (PointerTypeTakesAnyBlockArguments(DeclT) ||
+      PointerTypeTakesAnyObjCQualifiedType(DeclT)) {
+    // Replace the '^' with '*' for arguments.
+    // Replace id<P> with id/*<>*/
+    DeclLoc = ND->getLocation();
+    startBuf = SM->getCharacterData(DeclLoc);
+    const char *argListBegin, *argListEnd;
+    GetExtentOfArgList(startBuf, argListBegin, argListEnd);
+    while (argListBegin < argListEnd) {
+      if (*argListBegin == '^')
+        buf += '*';
+      else if (*argListBegin ==  '<') {
+        buf += "/*"; 
+        buf += *argListBegin++;
+        OrigLength++;;
+        while (*argListBegin != '>') {
+          buf += *argListBegin++;
+          OrigLength++;
+        }
+        buf += *argListBegin;
+        buf += "*/";
+      }
+      else
+        buf += *argListBegin;
+      argListBegin++;
+      OrigLength++;
+    }
+    buf += ')';
+    OrigLength++;
+  }
+  ReplaceText(Start, OrigLength, buf);
+  
+  return;
+}
+
+
+/// SynthesizeByrefCopyDestroyHelper - This routine synthesizes:
+/// void __Block_byref_id_object_copy(struct Block_byref_id_object *dst,
+///                    struct Block_byref_id_object *src) {
+///  _Block_object_assign (&_dest->object, _src->object, 
+///                        BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
+///                        [|BLOCK_FIELD_IS_WEAK]) // object
+///  _Block_object_assign(&_dest->object, _src->object, 
+///                       BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
+///                       [|BLOCK_FIELD_IS_WEAK]) // block
+/// }
+/// And:
+/// void __Block_byref_id_object_dispose(struct Block_byref_id_object *_src) {
+///  _Block_object_dispose(_src->object, 
+///                        BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
+///                        [|BLOCK_FIELD_IS_WEAK]) // object
+///  _Block_object_dispose(_src->object, 
+///                         BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
+///                         [|BLOCK_FIELD_IS_WEAK]) // block
+/// }
+
+std::string RewriteObjC::SynthesizeByrefCopyDestroyHelper(VarDecl *VD,
+                                                          int flag) {
+  std::string S;
+  if (CopyDestroyCache.count(flag))
+    return S;
+  CopyDestroyCache.insert(flag);
+  S = "static void __Block_byref_id_object_copy_";
+  S += utostr(flag);
+  S += "(void *dst, void *src) {\n";
+  
+  // offset into the object pointer is computed as:
+  // void * + void* + int + int + void* + void *
+  unsigned IntSize = 
+  static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
+  unsigned VoidPtrSize = 
+  static_cast<unsigned>(Context->getTypeSize(Context->VoidPtrTy));
+  
+  unsigned offset = (VoidPtrSize*4 + IntSize + IntSize)/Context->getCharWidth();
+  S += " _Block_object_assign((char*)dst + ";
+  S += utostr(offset);
+  S += ", *(void * *) ((char*)src + ";
+  S += utostr(offset);
+  S += "), ";
+  S += utostr(flag);
+  S += ");\n}\n";
+  
+  S += "static void __Block_byref_id_object_dispose_";
+  S += utostr(flag);
+  S += "(void *src) {\n";
+  S += " _Block_object_dispose(*(void * *) ((char*)src + ";
+  S += utostr(offset);
+  S += "), ";
+  S += utostr(flag);
+  S += ");\n}\n";
+  return S;
+}
+
+/// RewriteByRefVar - For each __block typex ND variable this routine transforms
+/// the declaration into:
+/// struct __Block_byref_ND {
+/// void *__isa;                  // NULL for everything except __weak pointers
+/// struct __Block_byref_ND *__forwarding;
+/// int32_t __flags;
+/// int32_t __size;
+/// void *__Block_byref_id_object_copy; // If variable is __block ObjC object
+/// void *__Block_byref_id_object_dispose; // If variable is __block ObjC object
+/// typex ND;
+/// };
+///
+/// It then replaces declaration of ND variable with:
+/// struct __Block_byref_ND ND = {__isa=0B, __forwarding=&ND, __flags=some_flag, 
+///                               __size=sizeof(struct __Block_byref_ND), 
+///                               ND=initializer-if-any};
+///
+///
+void RewriteObjC::RewriteByRefVar(VarDecl *ND) {
+  // Insert declaration for the function in which block literal is
+  // used.
+  if (CurFunctionDeclToDeclareForBlock)
+    RewriteBlockLiteralFunctionDecl(CurFunctionDeclToDeclareForBlock);
+  int flag = 0;
+  int isa = 0;
+  SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
+  if (DeclLoc.isInvalid())
+    // If type location is missing, it is because of missing type (a warning).
+    // Use variable's location which is good for this case.
+    DeclLoc = ND->getLocation();
+  const char *startBuf = SM->getCharacterData(DeclLoc);
+  SourceLocation X = ND->getLocEnd();
+  X = SM->getInstantiationLoc(X);
+  const char *endBuf = SM->getCharacterData(X);
+  std::string Name(ND->getNameAsString());
+  std::string ByrefType;
+  RewriteByRefString(ByrefType, Name, ND, true);
+  ByrefType += " {\n";
+  ByrefType += "  void *__isa;\n";
+  RewriteByRefString(ByrefType, Name, ND);
+  ByrefType += " *__forwarding;\n";
+  ByrefType += " int __flags;\n";
+  ByrefType += " int __size;\n";
+  // Add void *__Block_byref_id_object_copy; 
+  // void *__Block_byref_id_object_dispose; if needed.
+  QualType Ty = ND->getType();
+  bool HasCopyAndDispose = Context->BlockRequiresCopying(Ty);
+  if (HasCopyAndDispose) {
+    ByrefType += " void (*__Block_byref_id_object_copy)(void*, void*);\n";
+    ByrefType += " void (*__Block_byref_id_object_dispose)(void*);\n";
+  }
+
+  QualType T = Ty;
+  (void)convertBlockPointerToFunctionPointer(T);
+  T.getAsStringInternal(Name, Context->PrintingPolicy);
+    
+  ByrefType += " " + Name + ";\n";
+  ByrefType += "};\n";
+  // Insert this type in global scope. It is needed by helper function.
+  SourceLocation FunLocStart;
+  if (CurFunctionDef)
+     FunLocStart = CurFunctionDef->getTypeSpecStartLoc();
+  else {
+    assert(CurMethodDef && "RewriteByRefVar - CurMethodDef is null");
+    FunLocStart = CurMethodDef->getLocStart();
+  }
+  InsertText(FunLocStart, ByrefType);
+  if (Ty.isObjCGCWeak()) {
+    flag |= BLOCK_FIELD_IS_WEAK;
+    isa = 1;
+  }
+  
+  if (HasCopyAndDispose) {
+    flag = BLOCK_BYREF_CALLER;
+    QualType Ty = ND->getType();
+    // FIXME. Handle __weak variable (BLOCK_FIELD_IS_WEAK) as well.
+    if (Ty->isBlockPointerType())
+      flag |= BLOCK_FIELD_IS_BLOCK;
+    else
+      flag |= BLOCK_FIELD_IS_OBJECT;
+    std::string HF = SynthesizeByrefCopyDestroyHelper(ND, flag);
+    if (!HF.empty())
+      InsertText(FunLocStart, HF);
+  }
+  
+  // struct __Block_byref_ND ND = 
+  // {0, &ND, some_flag, __size=sizeof(struct __Block_byref_ND), 
+  //  initializer-if-any};
+  bool hasInit = (ND->getInit() != 0);
+  unsigned flags = 0;
+  if (HasCopyAndDispose)
+    flags |= BLOCK_HAS_COPY_DISPOSE;
+  Name = ND->getNameAsString();
+  ByrefType.clear();
+  RewriteByRefString(ByrefType, Name, ND);
+  std::string ForwardingCastType("(");
+  ForwardingCastType += ByrefType + " *)";
+  if (!hasInit) {
+    ByrefType += " " + Name + " = {(void*)";
+    ByrefType += utostr(isa);
+    ByrefType += "," +  ForwardingCastType + "&" + Name + ", ";
+    ByrefType += utostr(flags);
+    ByrefType += ", ";
+    ByrefType += "sizeof(";
+    RewriteByRefString(ByrefType, Name, ND);
+    ByrefType += ")";
+    if (HasCopyAndDispose) {
+      ByrefType += ", __Block_byref_id_object_copy_";
+      ByrefType += utostr(flag);
+      ByrefType += ", __Block_byref_id_object_dispose_";
+      ByrefType += utostr(flag);
+    }
+    ByrefType += "};\n";
+    unsigned nameSize = Name.size();
+    // for block or function pointer declaration. Name is aleady
+    // part of the declaration.
+    if (Ty->isBlockPointerType() || Ty->isFunctionPointerType())
+      nameSize = 1;
+    ReplaceText(DeclLoc, endBuf-startBuf+nameSize, ByrefType);
+  }
+  else {
+    SourceLocation startLoc;
+    Expr *E = ND->getInit();
+    if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
+      startLoc = ECE->getLParenLoc();
+    else
+      startLoc = E->getLocStart();
+    startLoc = SM->getInstantiationLoc(startLoc);
+    endBuf = SM->getCharacterData(startLoc);
+    ByrefType += " " + Name;
+    ByrefType += " = {(void*)";
+    ByrefType += utostr(isa);
+    ByrefType += "," +  ForwardingCastType + "&" + Name + ", ";
+    ByrefType += utostr(flags);
+    ByrefType += ", ";
+    ByrefType += "sizeof(";
+    RewriteByRefString(ByrefType, Name, ND);
+    ByrefType += "), ";
+    if (HasCopyAndDispose) {
+      ByrefType += "__Block_byref_id_object_copy_";
+      ByrefType += utostr(flag);
+      ByrefType += ", __Block_byref_id_object_dispose_";
+      ByrefType += utostr(flag);
+      ByrefType += ", ";
+    }
+    ReplaceText(DeclLoc, endBuf-startBuf, ByrefType);
+    
+    // Complete the newly synthesized compound expression by inserting a right
+    // curly brace before the end of the declaration.
+    // FIXME: This approach avoids rewriting the initializer expression. It
+    // also assumes there is only one declarator. For example, the following
+    // isn't currently supported by this routine (in general):
+    // 
+    // double __block BYREFVAR = 1.34, BYREFVAR2 = 1.37;
+    //
+    const char *startInitializerBuf = SM->getCharacterData(startLoc);
+    const char *semiBuf = strchr(startInitializerBuf, ';');
+    assert((*semiBuf == ';') && "RewriteByRefVar: can't find ';'");
+    SourceLocation semiLoc =
+      startLoc.getFileLocWithOffset(semiBuf-startInitializerBuf);
+
+    InsertText(semiLoc, "}");
+  }
+  return;
+}
+
+void RewriteObjC::CollectBlockDeclRefInfo(BlockExpr *Exp) {
+  // Add initializers for any closure decl refs.
+  GetBlockDeclRefExprs(Exp->getBody());
+  if (BlockDeclRefs.size()) {
+    // Unique all "by copy" declarations.
+    for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
+      if (!BlockDeclRefs[i]->isByRef()) {
+        if (!BlockByCopyDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
+          BlockByCopyDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
+          BlockByCopyDecls.push_back(BlockDeclRefs[i]->getDecl());
+        }
+      }
+    // Unique all "by ref" declarations.
+    for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
+      if (BlockDeclRefs[i]->isByRef()) {
+        if (!BlockByRefDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
+          BlockByRefDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
+          BlockByRefDecls.push_back(BlockDeclRefs[i]->getDecl());
+        }
+      }
+    // Find any imported blocks...they will need special attention.
+    for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
+      if (BlockDeclRefs[i]->isByRef() ||
+          BlockDeclRefs[i]->getType()->isObjCObjectPointerType() || 
+          BlockDeclRefs[i]->getType()->isBlockPointerType())
+        ImportedBlockDecls.insert(BlockDeclRefs[i]->getDecl());
+  }
+}
+
+FunctionDecl *RewriteObjC::SynthBlockInitFunctionDecl(llvm::StringRef name) {
+  IdentifierInfo *ID = &Context->Idents.get(name);
+  QualType FType = Context->getFunctionNoProtoType(Context->VoidPtrTy);
+  return FunctionDecl::Create(*Context, TUDecl, SourceLocation(),
+                              SourceLocation(), ID, FType, 0, SC_Extern,
+                              SC_None, false, false);
+}
+
+Stmt *RewriteObjC::SynthBlockInitExpr(BlockExpr *Exp,
+          const llvm::SmallVector<BlockDeclRefExpr *, 8> &InnerBlockDeclRefs) {
+  const BlockDecl *block = Exp->getBlockDecl();
+  Blocks.push_back(Exp);
+
+  CollectBlockDeclRefInfo(Exp);
+  
+  // Add inner imported variables now used in current block.
+ int countOfInnerDecls = 0;
+  if (!InnerBlockDeclRefs.empty()) {
+    for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++) {
+      BlockDeclRefExpr *Exp = InnerBlockDeclRefs[i];
+      ValueDecl *VD = Exp->getDecl();
+      if (!Exp->isByRef() && !BlockByCopyDeclsPtrSet.count(VD)) {
+      // We need to save the copied-in variables in nested
+      // blocks because it is needed at the end for some of the API generations.
+      // See SynthesizeBlockLiterals routine.
+        InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
+        BlockDeclRefs.push_back(Exp);
+        BlockByCopyDeclsPtrSet.insert(VD);
+        BlockByCopyDecls.push_back(VD);
+      }
+      if (Exp->isByRef() && !BlockByRefDeclsPtrSet.count(VD)) {
+        InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
+        BlockDeclRefs.push_back(Exp);
+        BlockByRefDeclsPtrSet.insert(VD);
+        BlockByRefDecls.push_back(VD);
+      }
+    }
+    // Find any imported blocks...they will need special attention.
+    for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++)
+      if (InnerBlockDeclRefs[i]->isByRef() ||
+          InnerBlockDeclRefs[i]->getType()->isObjCObjectPointerType() || 
+          InnerBlockDeclRefs[i]->getType()->isBlockPointerType())
+        ImportedBlockDecls.insert(InnerBlockDeclRefs[i]->getDecl());
+  }
+  InnerDeclRefsCount.push_back(countOfInnerDecls);
+  
+  std::string FuncName;
+
+  if (CurFunctionDef)
+    FuncName = CurFunctionDef->getNameAsString();
+  else if (CurMethodDef)
+    BuildUniqueMethodName(FuncName, CurMethodDef);
+  else if (GlobalVarDecl)
+    FuncName = std::string(GlobalVarDecl->getNameAsString());
+
+  std::string BlockNumber = utostr(Blocks.size()-1);
+
+  std::string Tag = "__" + FuncName + "_block_impl_" + BlockNumber;
+  std::string Func = "__" + FuncName + "_block_func_" + BlockNumber;
+
+  // Get a pointer to the function type so we can cast appropriately.
+  QualType BFT = convertFunctionTypeOfBlocks(Exp->getFunctionType());
+  QualType FType = Context->getPointerType(BFT);
+
+  FunctionDecl *FD;
+  Expr *NewRep;
+
+  // Simulate a contructor call...
+  FD = SynthBlockInitFunctionDecl(Tag);
+  DeclRefExpr *DRE = new (Context) DeclRefExpr(FD, FType, VK_RValue,
+                                               SourceLocation());
+
+  llvm::SmallVector<Expr*, 4> InitExprs;
+
+  // Initialize the block function.
+  FD = SynthBlockInitFunctionDecl(Func);
+  DeclRefExpr *Arg = new (Context) DeclRefExpr(FD, FD->getType(), VK_LValue,
+                                               SourceLocation());
+  CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
+                                                CK_BitCast, Arg);
+  InitExprs.push_back(castExpr);
+
+  // Initialize the block descriptor.
+  std::string DescData = "__" + FuncName + "_block_desc_" + BlockNumber + "_DATA";
+
+  VarDecl *NewVD = VarDecl::Create(*Context, TUDecl,
+                                   SourceLocation(), SourceLocation(),
+                                   &Context->Idents.get(DescData.c_str()),
+                                   Context->VoidPtrTy, 0,
+                                   SC_Static, SC_None);
+  UnaryOperator *DescRefExpr =
+    new (Context) UnaryOperator(new (Context) DeclRefExpr(NewVD,
+                                                          Context->VoidPtrTy,
+                                                          VK_LValue,
+                                                          SourceLocation()), 
+                                UO_AddrOf,
+                                Context->getPointerType(Context->VoidPtrTy), 
+                                VK_RValue, OK_Ordinary,
+                                SourceLocation());
+  InitExprs.push_back(DescRefExpr); 
+  
+  // Add initializers for any closure decl refs.
+  if (BlockDeclRefs.size()) {
+    Expr *Exp;
+    // Output all "by copy" declarations.
+    for (llvm::SmallVector<ValueDecl*,8>::iterator I = BlockByCopyDecls.begin(),
+         E = BlockByCopyDecls.end(); I != E; ++I) {
+      if (isObjCType((*I)->getType())) {
+        // FIXME: Conform to ABI ([[obj retain] autorelease]).
+        FD = SynthBlockInitFunctionDecl((*I)->getName());
+        Exp = new (Context) DeclRefExpr(FD, FD->getType(), VK_LValue,
+                                        SourceLocation());
+        if (HasLocalVariableExternalStorage(*I)) {
+          QualType QT = (*I)->getType();
+          QT = Context->getPointerType(QT);
+          Exp = new (Context) UnaryOperator(Exp, UO_AddrOf, QT, VK_RValue,
+                                            OK_Ordinary, SourceLocation());
+        }
+      } else if (isTopLevelBlockPointerType((*I)->getType())) {
+        FD = SynthBlockInitFunctionDecl((*I)->getName());
+        Arg = new (Context) DeclRefExpr(FD, FD->getType(), VK_LValue,
+                                        SourceLocation());
+        Exp = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
+                                       CK_BitCast, Arg);
+      } else {
+        FD = SynthBlockInitFunctionDecl((*I)->getName());
+        Exp = new (Context) DeclRefExpr(FD, FD->getType(), VK_LValue,
+                                        SourceLocation());
+        if (HasLocalVariableExternalStorage(*I)) {
+          QualType QT = (*I)->getType();
+          QT = Context->getPointerType(QT);
+          Exp = new (Context) UnaryOperator(Exp, UO_AddrOf, QT, VK_RValue,
+                                            OK_Ordinary, SourceLocation());
+        }
+        
+      }
+      InitExprs.push_back(Exp);
+    }
+    // Output all "by ref" declarations.
+    for (llvm::SmallVector<ValueDecl*,8>::iterator I = BlockByRefDecls.begin(),
+         E = BlockByRefDecls.end(); I != E; ++I) {
+      ValueDecl *ND = (*I);
+      std::string Name(ND->getNameAsString());
+      std::string RecName;
+      RewriteByRefString(RecName, Name, ND, true);
+      IdentifierInfo *II = &Context->Idents.get(RecName.c_str() 
+                                                + sizeof("struct"));
+      RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                          SourceLocation(), SourceLocation(),
+                                          II);
+      assert(RD && "SynthBlockInitExpr(): Can't find RecordDecl");
+      QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
+      
+      FD = SynthBlockInitFunctionDecl((*I)->getName());
+      Exp = new (Context) DeclRefExpr(FD, FD->getType(), VK_LValue,
+                                      SourceLocation());
+      bool isNestedCapturedVar = false;
+      if (block)
+        for (BlockDecl::capture_const_iterator ci = block->capture_begin(),
+             ce = block->capture_end(); ci != ce; ++ci) {
+          const VarDecl *variable = ci->getVariable();
+          if (variable == ND && ci->isNested()) {
+            assert (ci->isByRef() && 
+                    "SynthBlockInitExpr - captured block variable is not byref");
+            isNestedCapturedVar = true;
+            break;
+          }
+        }
+      // captured nested byref variable has its address passed. Do not take
+      // its address again.
+      if (!isNestedCapturedVar)
+          Exp = new (Context) UnaryOperator(Exp, UO_AddrOf,
+                                     Context->getPointerType(Exp->getType()),
+                                     VK_RValue, OK_Ordinary, SourceLocation());
+      Exp = NoTypeInfoCStyleCastExpr(Context, castT, CK_BitCast, Exp);
+      InitExprs.push_back(Exp);
+    }
+  }
+  if (ImportedBlockDecls.size()) {
+    // generate BLOCK_HAS_COPY_DISPOSE(have helper funcs) | BLOCK_HAS_DESCRIPTOR
+    int flag = (BLOCK_HAS_COPY_DISPOSE | BLOCK_HAS_DESCRIPTOR);
+    unsigned IntSize = 
+      static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
+    Expr *FlagExp = IntegerLiteral::Create(*Context, llvm::APInt(IntSize, flag), 
+                                           Context->IntTy, SourceLocation());
+    InitExprs.push_back(FlagExp);
+  }
+  NewRep = new (Context) CallExpr(*Context, DRE, &InitExprs[0], InitExprs.size(),
+                                  FType, VK_LValue, SourceLocation());
+  NewRep = new (Context) UnaryOperator(NewRep, UO_AddrOf,
+                             Context->getPointerType(NewRep->getType()),
+                             VK_RValue, OK_Ordinary, SourceLocation());
+  NewRep = NoTypeInfoCStyleCastExpr(Context, FType, CK_BitCast,
+                                    NewRep);
+  BlockDeclRefs.clear();
+  BlockByRefDecls.clear();
+  BlockByRefDeclsPtrSet.clear();
+  BlockByCopyDecls.clear();
+  BlockByCopyDeclsPtrSet.clear();
+  ImportedBlockDecls.clear();
+  return NewRep;
+}
+
+bool RewriteObjC::IsDeclStmtInForeachHeader(DeclStmt *DS) {
+  if (const ObjCForCollectionStmt * CS = 
+      dyn_cast<ObjCForCollectionStmt>(Stmts.back()))
+        return CS->getElement() == DS;
+  return false;
+}
+
+//===----------------------------------------------------------------------===//
+// Function Body / Expression rewriting
+//===----------------------------------------------------------------------===//
+
+// This is run as a first "pass" prior to RewriteFunctionBodyOrGlobalInitializer().
+// The allows the main rewrite loop to associate all ObjCPropertyRefExprs with
+// their respective BinaryOperator. Without this knowledge, we'd need to rewrite
+// the ObjCPropertyRefExpr twice (once as a getter, and later as a setter).
+// Since the rewriter isn't capable of rewriting rewritten code, it's important
+// we get this right.
+void RewriteObjC::CollectPropertySetters(Stmt *S) {
+  // Perform a bottom up traversal of all children.
+  for (Stmt::child_range CI = S->children(); CI; ++CI)
+    if (*CI)
+      CollectPropertySetters(*CI);
+
+  if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(S)) {
+    if (BinOp->isAssignmentOp()) {
+      if (isa<ObjCPropertyRefExpr>(BinOp->getLHS()))
+        PropSetters[BinOp->getLHS()] = BinOp;
+    }
+  }
+}
+
+Stmt *RewriteObjC::RewriteFunctionBodyOrGlobalInitializer(Stmt *S) {
+  if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
+      isa<DoStmt>(S) || isa<ForStmt>(S))
+    Stmts.push_back(S);
+  else if (isa<ObjCForCollectionStmt>(S)) {
+    Stmts.push_back(S);
+    ObjCBcLabelNo.push_back(++BcLabelCount);
+  }
+
+  SourceRange OrigStmtRange = S->getSourceRange();
+
+  // Perform a bottom up rewrite of all children.
+  for (Stmt::child_range CI = S->children(); CI; ++CI)
+    if (*CI) {
+      Stmt *newStmt;
+      Stmt *ChildStmt = (*CI);
+      if (ObjCIvarRefExpr *IvarRefExpr = dyn_cast<ObjCIvarRefExpr>(ChildStmt)) {
+        Expr *OldBase = IvarRefExpr->getBase();
+        bool replaced = false;
+        newStmt = RewriteObjCNestedIvarRefExpr(ChildStmt, replaced);
+        if (replaced) {
+          if (ObjCIvarRefExpr *IRE = dyn_cast<ObjCIvarRefExpr>(newStmt))
+            ReplaceStmt(OldBase, IRE->getBase());
+          else
+            ReplaceStmt(ChildStmt, newStmt);
+        }
+      }
+      else
+        newStmt = RewriteFunctionBodyOrGlobalInitializer(ChildStmt);
+      if (newStmt) {
+          if (Expr *PropOrImplicitRefExpr = dyn_cast<Expr>(ChildStmt))
+            if (PropSetters[PropOrImplicitRefExpr] == S) {
+              S = newStmt;
+              newStmt = 0;
+            }
+        if (newStmt)
+          *CI = newStmt;
+      }
+      // If dealing with an assignment with LHS being a property reference
+      // expression, the entire assignment tree is rewritten into a property
+      // setter messaging. This involvs the RHS too. Do not attempt to rewrite
+      // RHS again.
+      if (Expr *Exp = dyn_cast<Expr>(ChildStmt))
+        if (isa<ObjCPropertyRefExpr>(Exp)) {
+          if (PropSetters[Exp]) {
+            ++CI;
+            continue;
+          }
+        }
+    }
+
+  if (BlockExpr *BE = dyn_cast<BlockExpr>(S)) {
+    llvm::SmallVector<BlockDeclRefExpr *, 8> InnerBlockDeclRefs;
+    llvm::SmallPtrSet<const DeclContext *, 8> InnerContexts;
+    InnerContexts.insert(BE->getBlockDecl());
+    ImportedLocalExternalDecls.clear();
+    GetInnerBlockDeclRefExprs(BE->getBody(),
+                              InnerBlockDeclRefs, InnerContexts);
+    // Rewrite the block body in place.
+    Stmt *SaveCurrentBody = CurrentBody;
+    CurrentBody = BE->getBody();
+    CollectPropertySetters(CurrentBody);
+    PropParentMap = 0;
+    RewriteFunctionBodyOrGlobalInitializer(BE->getBody());
+    CurrentBody = SaveCurrentBody;
+    PropParentMap = 0;
+    ImportedLocalExternalDecls.clear();
+    // Now we snarf the rewritten text and stash it away for later use.
+    std::string Str = Rewrite.ConvertToString(BE->getBody());
+    RewrittenBlockExprs[BE] = Str;
+
+    Stmt *blockTranscribed = SynthBlockInitExpr(BE, InnerBlockDeclRefs);
+                            
+    //blockTranscribed->dump();
+    ReplaceStmt(S, blockTranscribed);
+    return blockTranscribed;
+  }
+  // Handle specific things.
+  if (ObjCEncodeExpr *AtEncode = dyn_cast<ObjCEncodeExpr>(S))
+    return RewriteAtEncode(AtEncode);
+
+  if (isa<ObjCPropertyRefExpr>(S)) {
+    Expr *PropOrImplicitRefExpr = dyn_cast<Expr>(S);
+    assert(PropOrImplicitRefExpr && "Property or implicit setter/getter is null");
+    
+    BinaryOperator *BinOp = PropSetters[PropOrImplicitRefExpr];
+    if (BinOp) {
+      // Because the rewriter doesn't allow us to rewrite rewritten code,
+      // we need to rewrite the right hand side prior to rewriting the setter.
+      DisableReplaceStmt = true;
+      // Save the source range. Even if we disable the replacement, the
+      // rewritten node will have been inserted into the tree. If the synthesized
+      // node is at the 'end', the rewriter will fail. Consider this:
+      //    self.errorHandler = handler ? handler :
+      //              ^(NSURL *errorURL, NSError *error) { return (BOOL)1; };
+      SourceRange SrcRange = BinOp->getSourceRange();
+      Stmt *newStmt = RewriteFunctionBodyOrGlobalInitializer(BinOp->getRHS());
+      // Need to rewrite the ivar access expression if need be.
+      if (isa<ObjCIvarRefExpr>(newStmt)) {
+        bool replaced = false;
+        newStmt = RewriteObjCNestedIvarRefExpr(newStmt, replaced);
+      }
+      
+      DisableReplaceStmt = false;
+      //
+      // Unlike the main iterator, we explicily avoid changing 'BinOp'. If
+      // we changed the RHS of BinOp, the rewriter would fail (since it needs
+      // to see the original expression). Consider this example:
+      //
+      // Foo *obj1, *obj2;
+      //
+      // obj1.i = [obj2 rrrr];
+      //
+      // 'BinOp' for the previous expression looks like:
+      //
+      // (BinaryOperator 0x231ccf0 'int' '='
+      //   (ObjCPropertyRefExpr 0x231cc70 'int' Kind=PropertyRef Property="i"
+      //     (DeclRefExpr 0x231cc50 'Foo *' Var='obj1' 0x231cbb0))
+      //   (ObjCMessageExpr 0x231ccb0 'int' selector=rrrr
+      //     (DeclRefExpr 0x231cc90 'Foo *' Var='obj2' 0x231cbe0)))
+      //
+      // 'newStmt' represents the rewritten message expression. For example:
+      //
+      // (CallExpr 0x231d300 'id':'struct objc_object *'
+      //   (ParenExpr 0x231d2e0 'int (*)(id, SEL)'
+      //     (CStyleCastExpr 0x231d2c0 'int (*)(id, SEL)'
+      //       (CStyleCastExpr 0x231d220 'void *'
+      //         (DeclRefExpr 0x231d200 'id (id, SEL, ...)' FunctionDecl='objc_msgSend' 0x231cdc0))))
+      //
+      // Note that 'newStmt' is passed to RewritePropertyOrImplicitSetter so that it
+      // can be used as the setter argument. ReplaceStmt() will still 'see'
+      // the original RHS (since we haven't altered BinOp).
+      //
+      // This implies the Rewrite* routines can no longer delete the original
+      // node. As a result, we now leak the original AST nodes.
+      //
+      return RewritePropertyOrImplicitSetter(BinOp, dyn_cast<Expr>(newStmt), SrcRange);
+    } else {
+      return RewritePropertyOrImplicitGetter(PropOrImplicitRefExpr);
+    }
+  }
+  
+  if (ObjCSelectorExpr *AtSelector = dyn_cast<ObjCSelectorExpr>(S))
+    return RewriteAtSelector(AtSelector);
+
+  if (ObjCStringLiteral *AtString = dyn_cast<ObjCStringLiteral>(S))
+    return RewriteObjCStringLiteral(AtString);
+
+  if (ObjCMessageExpr *MessExpr = dyn_cast<ObjCMessageExpr>(S)) {
+#if 0
+    // Before we rewrite it, put the original message expression in a comment.
+    SourceLocation startLoc = MessExpr->getLocStart();
+    SourceLocation endLoc = MessExpr->getLocEnd();
+
+    const char *startBuf = SM->getCharacterData(startLoc);
+    const char *endBuf = SM->getCharacterData(endLoc);
+
+    std::string messString;
+    messString += "// ";
+    messString.append(startBuf, endBuf-startBuf+1);
+    messString += "\n";
+
+    // FIXME: Missing definition of
+    // InsertText(clang::SourceLocation, char const*, unsigned int).
+    // InsertText(startLoc, messString.c_str(), messString.size());
+    // Tried this, but it didn't work either...
+    // ReplaceText(startLoc, 0, messString.c_str(), messString.size());
+#endif
+    return RewriteMessageExpr(MessExpr);
+  }
+
+  if (ObjCAtTryStmt *StmtTry = dyn_cast<ObjCAtTryStmt>(S))
+    return RewriteObjCTryStmt(StmtTry);
+
+  if (ObjCAtSynchronizedStmt *StmtTry = dyn_cast<ObjCAtSynchronizedStmt>(S))
+    return RewriteObjCSynchronizedStmt(StmtTry);
+
+  if (ObjCAtThrowStmt *StmtThrow = dyn_cast<ObjCAtThrowStmt>(S))
+    return RewriteObjCThrowStmt(StmtThrow);
+
+  if (ObjCProtocolExpr *ProtocolExp = dyn_cast<ObjCProtocolExpr>(S))
+    return RewriteObjCProtocolExpr(ProtocolExp);
+
+  if (ObjCForCollectionStmt *StmtForCollection =
+        dyn_cast<ObjCForCollectionStmt>(S))
+    return RewriteObjCForCollectionStmt(StmtForCollection,
+                                        OrigStmtRange.getEnd());
+  if (BreakStmt *StmtBreakStmt =
+      dyn_cast<BreakStmt>(S))
+    return RewriteBreakStmt(StmtBreakStmt);
+  if (ContinueStmt *StmtContinueStmt =
+      dyn_cast<ContinueStmt>(S))
+    return RewriteContinueStmt(StmtContinueStmt);
+
+  // Need to check for protocol refs (id <P>, Foo <P> *) in variable decls
+  // and cast exprs.
+  if (DeclStmt *DS = dyn_cast<DeclStmt>(S)) {
+    // FIXME: What we're doing here is modifying the type-specifier that
+    // precedes the first Decl.  In the future the DeclGroup should have
+    // a separate type-specifier that we can rewrite.
+    // NOTE: We need to avoid rewriting the DeclStmt if it is within
+    // the context of an ObjCForCollectionStmt. For example:
+    //   NSArray *someArray;
+    //   for (id <FooProtocol> index in someArray) ;
+    // This is because RewriteObjCForCollectionStmt() does textual rewriting 
+    // and it depends on the original text locations/positions.
+    if (Stmts.empty() || !IsDeclStmtInForeachHeader(DS))
+      RewriteObjCQualifiedInterfaceTypes(*DS->decl_begin());
+
+    // Blocks rewrite rules.
+    for (DeclStmt::decl_iterator DI = DS->decl_begin(), DE = DS->decl_end();
+         DI != DE; ++DI) {
+      Decl *SD = *DI;
+      if (ValueDecl *ND = dyn_cast<ValueDecl>(SD)) {
+        if (isTopLevelBlockPointerType(ND->getType()))
+          RewriteBlockPointerDecl(ND);
+        else if (ND->getType()->isFunctionPointerType())
+          CheckFunctionPointerDecl(ND->getType(), ND);
+        if (VarDecl *VD = dyn_cast<VarDecl>(SD)) {
+          if (VD->hasAttr<BlocksAttr>()) {
+            static unsigned uniqueByrefDeclCount = 0;
+            assert(!BlockByRefDeclNo.count(ND) &&
+              "RewriteFunctionBodyOrGlobalInitializer: Duplicate byref decl");
+            BlockByRefDeclNo[ND] = uniqueByrefDeclCount++;
+            RewriteByRefVar(VD);
+          }
+          else           
+            RewriteTypeOfDecl(VD);
+        }
+      }
+      if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(SD)) {
+        if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
+          RewriteBlockPointerDecl(TD);
+        else if (TD->getUnderlyingType()->isFunctionPointerType())
+          CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
+      }
+    }
+  }
+
+  if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S))
+    RewriteObjCQualifiedInterfaceTypes(CE);
+
+  if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
+      isa<DoStmt>(S) || isa<ForStmt>(S)) {
+    assert(!Stmts.empty() && "Statement stack is empty");
+    assert ((isa<SwitchStmt>(Stmts.back()) || isa<WhileStmt>(Stmts.back()) ||
+             isa<DoStmt>(Stmts.back()) || isa<ForStmt>(Stmts.back()))
+            && "Statement stack mismatch");
+    Stmts.pop_back();
+  }
+  // Handle blocks rewriting.
+  if (BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(S)) {
+    if (BDRE->isByRef())
+      return RewriteBlockDeclRefExpr(BDRE);
+  }
+  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
+    ValueDecl *VD = DRE->getDecl(); 
+    if (VD->hasAttr<BlocksAttr>())
+      return RewriteBlockDeclRefExpr(DRE);
+    if (HasLocalVariableExternalStorage(VD))
+      return RewriteLocalVariableExternalStorage(DRE);
+  }
+  
+  if (CallExpr *CE = dyn_cast<CallExpr>(S)) {
+    if (CE->getCallee()->getType()->isBlockPointerType()) {
+      Stmt *BlockCall = SynthesizeBlockCall(CE, CE->getCallee());
+      ReplaceStmt(S, BlockCall);
+      return BlockCall;
+    }
+  }
+  if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S)) {
+    RewriteCastExpr(CE);
+  }
+#if 0
+  if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
+    CastExpr *Replacement = new (Context) CastExpr(ICE->getType(),
+                                                   ICE->getSubExpr(),
+                                                   SourceLocation());
+    // Get the new text.
+    std::string SStr;
+    llvm::raw_string_ostream Buf(SStr);
+    Replacement->printPretty(Buf, *Context);
+    const std::string &Str = Buf.str();
+
+    printf("CAST = %s\n", &Str[0]);
+    InsertText(ICE->getSubExpr()->getLocStart(), &Str[0], Str.size());
+    delete S;
+    return Replacement;
+  }
+#endif
+  // Return this stmt unmodified.
+  return S;
+}
+
+void RewriteObjC::RewriteRecordBody(RecordDecl *RD) {
+  for (RecordDecl::field_iterator i = RD->field_begin(), 
+                                  e = RD->field_end(); i != e; ++i) {
+    FieldDecl *FD = *i;
+    if (isTopLevelBlockPointerType(FD->getType()))
+      RewriteBlockPointerDecl(FD);
+    if (FD->getType()->isObjCQualifiedIdType() ||
+        FD->getType()->isObjCQualifiedInterfaceType())
+      RewriteObjCQualifiedInterfaceTypes(FD);
+  }
+}
+
+/// HandleDeclInMainFile - This is called for each top-level decl defined in the
+/// main file of the input.
+void RewriteObjC::HandleDeclInMainFile(Decl *D) {
+  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
+    if (FD->isOverloadedOperator())
+      return;
+
+    // Since function prototypes don't have ParmDecl's, we check the function
+    // prototype. This enables us to rewrite function declarations and
+    // definitions using the same code.
+    RewriteBlocksInFunctionProtoType(FD->getType(), FD);
+
+    // FIXME: If this should support Obj-C++, support CXXTryStmt
+    if (CompoundStmt *Body = dyn_cast_or_null<CompoundStmt>(FD->getBody())) {
+      CurFunctionDef = FD;
+      CurFunctionDeclToDeclareForBlock = FD;
+      CollectPropertySetters(Body);
+      CurrentBody = Body;
+      Body =
+       cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
+      FD->setBody(Body);
+      CurrentBody = 0;
+      if (PropParentMap) {
+        delete PropParentMap;
+        PropParentMap = 0;
+      }
+      // This synthesizes and inserts the block "impl" struct, invoke function,
+      // and any copy/dispose helper functions.
+      InsertBlockLiteralsWithinFunction(FD);
+      CurFunctionDef = 0;
+      CurFunctionDeclToDeclareForBlock = 0;
+    }
+    return;
+  }
+  if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
+    if (CompoundStmt *Body = MD->getCompoundBody()) {
+      CurMethodDef = MD;
+      CollectPropertySetters(Body);
+      CurrentBody = Body;
+      Body =
+       cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
+      MD->setBody(Body);
+      CurrentBody = 0;
+      if (PropParentMap) {
+        delete PropParentMap;
+        PropParentMap = 0;
+      }
+      InsertBlockLiteralsWithinMethod(MD);
+      CurMethodDef = 0;
+    }
+  }
+  if (ObjCImplementationDecl *CI = dyn_cast<ObjCImplementationDecl>(D))
+    ClassImplementation.push_back(CI);
+  else if (ObjCCategoryImplDecl *CI = dyn_cast<ObjCCategoryImplDecl>(D))
+    CategoryImplementation.push_back(CI);
+  else if (ObjCClassDecl *CD = dyn_cast<ObjCClassDecl>(D))
+    RewriteForwardClassDecl(CD);
+  else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
+    RewriteObjCQualifiedInterfaceTypes(VD);
+    if (isTopLevelBlockPointerType(VD->getType()))
+      RewriteBlockPointerDecl(VD);
+    else if (VD->getType()->isFunctionPointerType()) {
+      CheckFunctionPointerDecl(VD->getType(), VD);
+      if (VD->getInit()) {
+        if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
+          RewriteCastExpr(CE);
+        }
+      }
+    } else if (VD->getType()->isRecordType()) {
+      RecordDecl *RD = VD->getType()->getAs<RecordType>()->getDecl();
+      if (RD->isDefinition())
+        RewriteRecordBody(RD);
+    }
+    if (VD->getInit()) {
+      GlobalVarDecl = VD;
+      CollectPropertySetters(VD->getInit());
+      CurrentBody = VD->getInit();
+      RewriteFunctionBodyOrGlobalInitializer(VD->getInit());
+      CurrentBody = 0;
+      if (PropParentMap) {
+        delete PropParentMap;
+        PropParentMap = 0;
+      }
+      SynthesizeBlockLiterals(VD->getTypeSpecStartLoc(),
+                              VD->getName());
+      GlobalVarDecl = 0;
+
+      // This is needed for blocks.
+      if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
+        RewriteCastExpr(CE);
+      }
+    }
+    return;
+  }
+  if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
+    if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
+      RewriteBlockPointerDecl(TD);
+    else if (TD->getUnderlyingType()->isFunctionPointerType())
+      CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
+    return;
+  }
+  if (RecordDecl *RD = dyn_cast<RecordDecl>(D)) {
+    if (RD->isDefinition()) 
+      RewriteRecordBody(RD);
+    return;
+  }
+  // Nothing yet.
+}
+
+void RewriteObjC::HandleTranslationUnit(ASTContext &C) {
+  if (Diags.hasErrorOccurred())
+    return;
+
+  RewriteInclude();
+
+  // Here's a great place to add any extra declarations that may be needed.
+  // Write out meta data for each @protocol(<expr>).
+  for (llvm::SmallPtrSet<ObjCProtocolDecl *,8>::iterator I = ProtocolExprDecls.begin(),
+       E = ProtocolExprDecls.end(); I != E; ++I)
+    RewriteObjCProtocolMetaData(*I, "", "", Preamble);
+
+  InsertText(SM->getLocForStartOfFile(MainFileID), Preamble, false);
+  if (ClassImplementation.size() || CategoryImplementation.size())
+    RewriteImplementations();
+
+  // Get the buffer corresponding to MainFileID.  If we haven't changed it, then
+  // we are done.
+  if (const RewriteBuffer *RewriteBuf =
+      Rewrite.getRewriteBufferFor(MainFileID)) {
+    //printf("Changed:\n");
+    *OutFile << std::string(RewriteBuf->begin(), RewriteBuf->end());
+  } else {
+    llvm::errs() << "No changes\n";
+  }
+
+  if (ClassImplementation.size() || CategoryImplementation.size() ||
+      ProtocolExprDecls.size()) {
+    // Rewrite Objective-c meta data*
+    std::string ResultStr;
+    SynthesizeMetaDataIntoBuffer(ResultStr);
+    // Emit metadata.
+    *OutFile << ResultStr;
+  }
+  OutFile->flush();
+}
diff --git a/contrib/llvm/tools/clang/lib/Rewrite/RewriteRope.cpp b/contrib/llvm/tools/clang/lib/Rewrite/RewriteRope.cpp
new file mode 100644
index 0000000..cfedd4b
--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/Rewrite/RewriteRope.cpp
@@ -0,0 +1,808 @@
+//===--- RewriteRope.cpp - Rope specialized for rewriter --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file implements the RewriteRope class, which is a powerful string.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/RewriteRope.h"
+#include "llvm/Support/Casting.h"
+#include <algorithm>
+using namespace clang;
+using llvm::dyn_cast;
+using llvm::cast;
+
+/// RewriteRope is a "strong" string class, designed to make insertions and
+/// deletions in the middle of the string nearly constant time (really, they are
+/// O(log N), but with a very low constant factor).
+///
+/// The implementation of this datastructure is a conceptual linear sequence of
+/// RopePiece elements.  Each RopePiece represents a view on a separately
+/// allocated and reference counted string.  This means that splitting a very
+/// long string can be done in constant time by splitting a RopePiece that
+/// references the whole string into two rope pieces that reference each half.
+/// Once split, another string can be inserted in between the two halves by
+/// inserting a RopePiece in between the two others.  All of this is very
+/// inexpensive: it takes time proportional to the number of RopePieces, not the
+/// length of the strings they represent.
+///
+/// While a linear sequences of RopePieces is the conceptual model, the actual
+/// implementation captures them in an adapted B+ Tree.  Using a B+ tree (which
+/// is a tree that keeps the values in the leaves and has where each node
+/// contains a reasonable number of pointers to children/values) allows us to
+/// maintain efficient operation when the RewriteRope contains a *huge* number
+/// of RopePieces.  The basic idea of the B+ Tree is that it allows us to find
+/// the RopePiece corresponding to some offset very efficiently, and it
+/// automatically balances itself on insertions of RopePieces (which can happen
+/// for both insertions and erases of string ranges).
+///
+/// The one wrinkle on the theory is that we don't attempt to keep the tree
+/// properly balanced when erases happen.  Erases of string data can both insert
+/// new RopePieces (e.g. when the middle of some other rope piece is deleted,
+/// which results in two rope pieces, which is just like an insert) or it can
+/// reduce the number of RopePieces maintained by the B+Tree.  In the case when
+/// the number of RopePieces is reduced, we don't attempt to maintain the
+/// standard 'invariant' that each node in the tree contains at least
+/// 'WidthFactor' children/values.  For our use cases, this doesn't seem to
+/// matter.
+///
+/// The implementation below is primarily implemented in terms of three classes:
+///   RopePieceBTreeNode - Common base class for:
+///
+///     RopePieceBTreeLeaf - Directly manages up to '2*WidthFactor' RopePiece
+///          nodes.  This directly represents a chunk of the string with those
+///          RopePieces contatenated.
+///     RopePieceBTreeInterior - An interior node in the B+ Tree, which manages
+///          up to '2*WidthFactor' other nodes in the tree.
+
+
+//===----------------------------------------------------------------------===//
+// RopePieceBTreeNode Class
+//===----------------------------------------------------------------------===//
+
+namespace {
+  /// RopePieceBTreeNode - Common base class of RopePieceBTreeLeaf and
+  /// RopePieceBTreeInterior.  This provides some 'virtual' dispatching methods
+  /// and a flag that determines which subclass the instance is.  Also
+  /// important, this node knows the full extend of the node, including any
+  /// children that it has.  This allows efficient skipping over entire subtrees
+  /// when looking for an offset in the BTree.
+  class RopePieceBTreeNode {
+  protected:
+    /// WidthFactor - This controls the number of K/V slots held in the BTree:
+    /// how wide it is.  Each level of the BTree is guaranteed to have at least
+    /// 'WidthFactor' elements in it (either ropepieces or children), (except
+    /// the root, which may have less) and may have at most 2*WidthFactor
+    /// elements.
+    enum { WidthFactor = 8 };
+
+    /// Size - This is the number of bytes of file this node (including any
+    /// potential children) covers.
+    unsigned Size;
+
+    /// IsLeaf - True if this is an instance of RopePieceBTreeLeaf, false if it
+    /// is an instance of RopePieceBTreeInterior.
+    bool IsLeaf;
+
+    RopePieceBTreeNode(bool isLeaf) : Size(0), IsLeaf(isLeaf) {}
+    ~RopePieceBTreeNode() {}
+  public:
+
+    bool isLeaf() const { return IsLeaf; }
+    unsigned size() const { return Size; }
+
+    void Destroy();
+
+    /// split - Split the range containing the specified offset so that we are
+    /// guaranteed that there is a place to do an insertion at the specified
+    /// offset.  The offset is relative, so "0" is the start of the node.
+    ///
+    /// If there is no space in this subtree for the extra piece, the extra tree
+    /// node is returned and must be inserted into a parent.
+    RopePieceBTreeNode *split(unsigned Offset);
+
+    /// insert - Insert the specified ropepiece into this tree node at the
+    /// specified offset.  The offset is relative, so "0" is the start of the
+    /// node.
+    ///
+    /// If there is no space in this subtree for the extra piece, the extra tree
+    /// node is returned and must be inserted into a parent.
+    RopePieceBTreeNode *insert(unsigned Offset, const RopePiece &R);
+
+    /// erase - Remove NumBytes from this node at the specified offset.  We are
+    /// guaranteed that there is a split at Offset.
+    void erase(unsigned Offset, unsigned NumBytes);
+
+    //static inline bool classof(const RopePieceBTreeNode *) { return true; }
+
+  };
+} // end anonymous namespace
+
+//===----------------------------------------------------------------------===//
+// RopePieceBTreeLeaf Class
+//===----------------------------------------------------------------------===//
+
+namespace {
+  /// RopePieceBTreeLeaf - Directly manages up to '2*WidthFactor' RopePiece
+  /// nodes.  This directly represents a chunk of the string with those
+  /// RopePieces contatenated.  Since this is a B+Tree, all values (in this case
+  /// instances of RopePiece) are stored in leaves like this.  To make iteration
+  /// over the leaves efficient, they maintain a singly linked list through the
+  /// NextLeaf field.  This allows the B+Tree forward iterator to be constant
+  /// time for all increments.
+  class RopePieceBTreeLeaf : public RopePieceBTreeNode {
+    /// NumPieces - This holds the number of rope pieces currently active in the
+    /// Pieces array.
+    unsigned char NumPieces;
+
+    /// Pieces - This tracks the file chunks currently in this leaf.
+    ///
+    RopePiece Pieces[2*WidthFactor];
+
+    /// NextLeaf - This is a pointer to the next leaf in the tree, allowing
+    /// efficient in-order forward iteration of the tree without traversal.
+    RopePieceBTreeLeaf **PrevLeaf, *NextLeaf;
+  public:
+    RopePieceBTreeLeaf() : RopePieceBTreeNode(true), NumPieces(0),
+                           PrevLeaf(0), NextLeaf(0) {}
+    ~RopePieceBTreeLeaf() {
+      if (PrevLeaf || NextLeaf)
+        removeFromLeafInOrder();
+      clear();
+    }
+
+    bool isFull() const { return NumPieces == 2*WidthFactor; }
+
+    /// clear - Remove all rope pieces from this leaf.
+    void clear() {
+      while (NumPieces)
+        Pieces[--NumPieces] = RopePiece();
+      Size = 0;
+    }
+
+    unsigned getNumPieces() const { return NumPieces; }
+
+    const RopePiece &getPiece(unsigned i) const {
+      assert(i < getNumPieces() && "Invalid piece ID");
+      return Pieces[i];
+    }
+
+    const RopePieceBTreeLeaf *getNextLeafInOrder() const { return NextLeaf; }
+    void insertAfterLeafInOrder(RopePieceBTreeLeaf *Node) {
+      assert(PrevLeaf == 0 && NextLeaf == 0 && "Already in ordering");
+
+      NextLeaf = Node->NextLeaf;
+      if (NextLeaf)
+        NextLeaf->PrevLeaf = &NextLeaf;
+      PrevLeaf = &Node->NextLeaf;
+      Node->NextLeaf = this;
+    }
+
+    void removeFromLeafInOrder() {
+      if (PrevLeaf) {
+        *PrevLeaf = NextLeaf;
+        if (NextLeaf)
+          NextLeaf->PrevLeaf = PrevLeaf;
+      } else if (NextLeaf) {
+        NextLeaf->PrevLeaf = 0;
+      }
+    }
+
+    /// FullRecomputeSizeLocally - This method recomputes the 'Size' field by
+    /// summing the size of all RopePieces.
+    void FullRecomputeSizeLocally() {
+      Size = 0;
+      for (unsigned i = 0, e = getNumPieces(); i != e; ++i)
+        Size += getPiece(i).size();
+    }
+
+    /// split - Split the range containing the specified offset so that we are
+    /// guaranteed that there is a place to do an insertion at the specified
+    /// offset.  The offset is relative, so "0" is the start of the node.
+    ///
+    /// If there is no space in this subtree for the extra piece, the extra tree
+    /// node is returned and must be inserted into a parent.
+    RopePieceBTreeNode *split(unsigned Offset);
+
+    /// insert - Insert the specified ropepiece into this tree node at the
+    /// specified offset.  The offset is relative, so "0" is the start of the
+    /// node.
+    ///
+    /// If there is no space in this subtree for the extra piece, the extra tree
+    /// node is returned and must be inserted into a parent.
+    RopePieceBTreeNode *insert(unsigned Offset, const RopePiece &R);
+
+
+    /// erase - Remove NumBytes from this node at the specified offset.  We are
+    /// guaranteed that there is a split at Offset.
+    void erase(unsigned Offset, unsigned NumBytes);
+
+    //static inline bool classof(const RopePieceBTreeLeaf *) { return true; }
+    static inline bool classof(const RopePieceBTreeNode *N) {
+      return N->isLeaf();
+    }
+  };
+} // end anonymous namespace
+
+/// split - Split the range containing the specified offset so that we are
+/// guaranteed that there is a place to do an insertion at the specified
+/// offset.  The offset is relative, so "0" is the start of the node.
+///
+/// If there is no space in this subtree for the extra piece, the extra tree
+/// node is returned and must be inserted into a parent.
+RopePieceBTreeNode *RopePieceBTreeLeaf::split(unsigned Offset) {
+  // Find the insertion point.  We are guaranteed that there is a split at the
+  // specified offset so find it.
+  if (Offset == 0 || Offset == size()) {
+    // Fastpath for a common case.  There is already a splitpoint at the end.
+    return 0;
+  }
+
+  // Find the piece that this offset lands in.
+  unsigned PieceOffs = 0;
+  unsigned i = 0;
+  while (Offset >= PieceOffs+Pieces[i].size()) {
+    PieceOffs += Pieces[i].size();
+    ++i;
+  }
+
+  // If there is already a split point at the specified offset, just return
+  // success.
+  if (PieceOffs == Offset)
+    return 0;
+
+  // Otherwise, we need to split piece 'i' at Offset-PieceOffs.  Convert Offset
+  // to being Piece relative.
+  unsigned IntraPieceOffset = Offset-PieceOffs;
+
+  // We do this by shrinking the RopePiece and then doing an insert of the tail.
+  RopePiece Tail(Pieces[i].StrData, Pieces[i].StartOffs+IntraPieceOffset,
+                 Pieces[i].EndOffs);
+  Size -= Pieces[i].size();
+  Pieces[i].EndOffs = Pieces[i].StartOffs+IntraPieceOffset;
+  Size += Pieces[i].size();
+
+  return insert(Offset, Tail);
+}
+
+
+/// insert - Insert the specified RopePiece into this tree node at the
+/// specified offset.  The offset is relative, so "0" is the start of the node.
+///
+/// If there is no space in this subtree for the extra piece, the extra tree
+/// node is returned and must be inserted into a parent.
+RopePieceBTreeNode *RopePieceBTreeLeaf::insert(unsigned Offset,
+                                               const RopePiece &R) {
+  // If this node is not full, insert the piece.
+  if (!isFull()) {
+    // Find the insertion point.  We are guaranteed that there is a split at the
+    // specified offset so find it.
+    unsigned i = 0, e = getNumPieces();
+    if (Offset == size()) {
+      // Fastpath for a common case.
+      i = e;
+    } else {
+      unsigned SlotOffs = 0;
+      for (; Offset > SlotOffs; ++i)
+        SlotOffs += getPiece(i).size();
+      assert(SlotOffs == Offset && "Split didn't occur before insertion!");
+    }
+
+    // For an insertion into a non-full leaf node, just insert the value in
+    // its sorted position.  This requires moving later values over.
+    for (; i != e; --e)
+      Pieces[e] = Pieces[e-1];
+    Pieces[i] = R;
+    ++NumPieces;
+    Size += R.size();
+    return 0;
+  }
+
+  // Otherwise, if this is leaf is full, split it in two halves.  Since this
+  // node is full, it contains 2*WidthFactor values.  We move the first
+  // 'WidthFactor' values to the LHS child (which we leave in this node) and
+  // move the last 'WidthFactor' values into the RHS child.
+
+  // Create the new node.
+  RopePieceBTreeLeaf *NewNode = new RopePieceBTreeLeaf();
+
+  // Move over the last 'WidthFactor' values from here to NewNode.
+  std::copy(&Pieces[WidthFactor], &Pieces[2*WidthFactor],
+            &NewNode->Pieces[0]);
+  // Replace old pieces with null RopePieces to drop refcounts.
+  std::fill(&Pieces[WidthFactor], &Pieces[2*WidthFactor], RopePiece());
+
+  // Decrease the number of values in the two nodes.
+  NewNode->NumPieces = NumPieces = WidthFactor;
+
+  // Recompute the two nodes' size.
+  NewNode->FullRecomputeSizeLocally();
+  FullRecomputeSizeLocally();
+
+  // Update the list of leaves.
+  NewNode->insertAfterLeafInOrder(this);
+
+  // These insertions can't fail.
+  if (this->size() >= Offset)
+    this->insert(Offset, R);
+  else
+    NewNode->insert(Offset - this->size(), R);
+  return NewNode;
+}
+
+/// erase - Remove NumBytes from this node at the specified offset.  We are
+/// guaranteed that there is a split at Offset.
+void RopePieceBTreeLeaf::erase(unsigned Offset, unsigned NumBytes) {
+  // Since we are guaranteed that there is a split at Offset, we start by
+  // finding the Piece that starts there.
+  unsigned PieceOffs = 0;
+  unsigned i = 0;
+  for (; Offset > PieceOffs; ++i)
+    PieceOffs += getPiece(i).size();
+  assert(PieceOffs == Offset && "Split didn't occur before erase!");
+
+  unsigned StartPiece = i;
+
+  // Figure out how many pieces completely cover 'NumBytes'.  We want to remove
+  // all of them.
+  for (; Offset+NumBytes > PieceOffs+getPiece(i).size(); ++i)
+    PieceOffs += getPiece(i).size();
+
+  // If we exactly include the last one, include it in the region to delete.
+  if (Offset+NumBytes == PieceOffs+getPiece(i).size())
+    PieceOffs += getPiece(i).size(), ++i;
+
+  // If we completely cover some RopePieces, erase them now.
+  if (i != StartPiece) {
+    unsigned NumDeleted = i-StartPiece;
+    for (; i != getNumPieces(); ++i)
+      Pieces[i-NumDeleted] = Pieces[i];
+
+    // Drop references to dead rope pieces.
+    std::fill(&Pieces[getNumPieces()-NumDeleted], &Pieces[getNumPieces()],
+              RopePiece());
+    NumPieces -= NumDeleted;
+
+    unsigned CoverBytes = PieceOffs-Offset;
+    NumBytes -= CoverBytes;
+    Size -= CoverBytes;
+  }
+
+  // If we completely removed some stuff, we could be done.
+  if (NumBytes == 0) return;
+
+  // Okay, now might be erasing part of some Piece.  If this is the case, then
+  // move the start point of the piece.
+  assert(getPiece(StartPiece).size() > NumBytes);
+  Pieces[StartPiece].StartOffs += NumBytes;
+
+  // The size of this node just shrunk by NumBytes.
+  Size -= NumBytes;
+}
+
+//===----------------------------------------------------------------------===//
+// RopePieceBTreeInterior Class
+//===----------------------------------------------------------------------===//
+
+namespace {
+  /// RopePieceBTreeInterior - This represents an interior node in the B+Tree,
+  /// which holds up to 2*WidthFactor pointers to child nodes.
+  class RopePieceBTreeInterior : public RopePieceBTreeNode {
+    /// NumChildren - This holds the number of children currently active in the
+    /// Children array.
+    unsigned char NumChildren;
+    RopePieceBTreeNode *Children[2*WidthFactor];
+  public:
+    RopePieceBTreeInterior() : RopePieceBTreeNode(false), NumChildren(0) {}
+
+    RopePieceBTreeInterior(RopePieceBTreeNode *LHS, RopePieceBTreeNode *RHS)
+    : RopePieceBTreeNode(false) {
+      Children[0] = LHS;
+      Children[1] = RHS;
+      NumChildren = 2;
+      Size = LHS->size() + RHS->size();
+    }
+
+    bool isFull() const { return NumChildren == 2*WidthFactor; }
+
+    unsigned getNumChildren() const { return NumChildren; }
+    const RopePieceBTreeNode *getChild(unsigned i) const {
+      assert(i < NumChildren && "invalid child #");
+      return Children[i];
+    }
+    RopePieceBTreeNode *getChild(unsigned i) {
+      assert(i < NumChildren && "invalid child #");
+      return Children[i];
+    }
+
+    /// FullRecomputeSizeLocally - Recompute the Size field of this node by
+    /// summing up the sizes of the child nodes.
+    void FullRecomputeSizeLocally() {
+      Size = 0;
+      for (unsigned i = 0, e = getNumChildren(); i != e; ++i)
+        Size += getChild(i)->size();
+    }
+
+
+    /// split - Split the range containing the specified offset so that we are
+    /// guaranteed that there is a place to do an insertion at the specified
+    /// offset.  The offset is relative, so "0" is the start of the node.
+    ///
+    /// If there is no space in this subtree for the extra piece, the extra tree
+    /// node is returned and must be inserted into a parent.
+    RopePieceBTreeNode *split(unsigned Offset);
+
+
+    /// insert - Insert the specified ropepiece into this tree node at the
+    /// specified offset.  The offset is relative, so "0" is the start of the
+    /// node.
+    ///
+    /// If there is no space in this subtree for the extra piece, the extra tree
+    /// node is returned and must be inserted into a parent.
+    RopePieceBTreeNode *insert(unsigned Offset, const RopePiece &R);
+
+    /// HandleChildPiece - A child propagated an insertion result up to us.
+    /// Insert the new child, and/or propagate the result further up the tree.
+    RopePieceBTreeNode *HandleChildPiece(unsigned i, RopePieceBTreeNode *RHS);
+
+    /// erase - Remove NumBytes from this node at the specified offset.  We are
+    /// guaranteed that there is a split at Offset.
+    void erase(unsigned Offset, unsigned NumBytes);
+
+    //static inline bool classof(const RopePieceBTreeInterior *) { return true; }
+    static inline bool classof(const RopePieceBTreeNode *N) {
+      return !N->isLeaf();
+    }
+  };
+} // end anonymous namespace
+
+/// split - Split the range containing the specified offset so that we are
+/// guaranteed that there is a place to do an insertion at the specified
+/// offset.  The offset is relative, so "0" is the start of the node.
+///
+/// If there is no space in this subtree for the extra piece, the extra tree
+/// node is returned and must be inserted into a parent.
+RopePieceBTreeNode *RopePieceBTreeInterior::split(unsigned Offset) {
+  // Figure out which child to split.
+  if (Offset == 0 || Offset == size())
+    return 0;  // If we have an exact offset, we're already split.
+
+  unsigned ChildOffset = 0;
+  unsigned i = 0;
+  for (; Offset >= ChildOffset+getChild(i)->size(); ++i)
+    ChildOffset += getChild(i)->size();
+
+  // If already split there, we're done.
+  if (ChildOffset == Offset)
+    return 0;
+
+  // Otherwise, recursively split the child.
+  if (RopePieceBTreeNode *RHS = getChild(i)->split(Offset-ChildOffset))
+    return HandleChildPiece(i, RHS);
+  return 0;  // Done!
+}
+
+/// insert - Insert the specified ropepiece into this tree node at the
+/// specified offset.  The offset is relative, so "0" is the start of the
+/// node.
+///
+/// If there is no space in this subtree for the extra piece, the extra tree
+/// node is returned and must be inserted into a parent.
+RopePieceBTreeNode *RopePieceBTreeInterior::insert(unsigned Offset,
+                                                   const RopePiece &R) {
+  // Find the insertion point.  We are guaranteed that there is a split at the
+  // specified offset so find it.
+  unsigned i = 0, e = getNumChildren();
+
+  unsigned ChildOffs = 0;
+  if (Offset == size()) {
+    // Fastpath for a common case.  Insert at end of last child.
+    i = e-1;
+    ChildOffs = size()-getChild(i)->size();
+  } else {
+    for (; Offset > ChildOffs+getChild(i)->size(); ++i)
+      ChildOffs += getChild(i)->size();
+  }
+
+  Size += R.size();
+
+  // Insert at the end of this child.
+  if (RopePieceBTreeNode *RHS = getChild(i)->insert(Offset-ChildOffs, R))
+    return HandleChildPiece(i, RHS);
+
+  return 0;
+}
+
+/// HandleChildPiece - A child propagated an insertion result up to us.
+/// Insert the new child, and/or propagate the result further up the tree.
+RopePieceBTreeNode *
+RopePieceBTreeInterior::HandleChildPiece(unsigned i, RopePieceBTreeNode *RHS) {
+  // Otherwise the child propagated a subtree up to us as a new child.  See if
+  // we have space for it here.
+  if (!isFull()) {
+    // Insert RHS after child 'i'.
+    if (i + 1 != getNumChildren())
+      memmove(&Children[i+2], &Children[i+1],
+              (getNumChildren()-i-1)*sizeof(Children[0]));
+    Children[i+1] = RHS;
+    ++NumChildren;
+    return 0;
+  }
+
+  // Okay, this node is full.  Split it in half, moving WidthFactor children to
+  // a newly allocated interior node.
+
+  // Create the new node.
+  RopePieceBTreeInterior *NewNode = new RopePieceBTreeInterior();
+
+  // Move over the last 'WidthFactor' values from here to NewNode.
+  memcpy(&NewNode->Children[0], &Children[WidthFactor],
+         WidthFactor*sizeof(Children[0]));
+
+  // Decrease the number of values in the two nodes.
+  NewNode->NumChildren = NumChildren = WidthFactor;
+
+  // Finally, insert the two new children in the side the can (now) hold them.
+  // These insertions can't fail.
+  if (i < WidthFactor)
+    this->HandleChildPiece(i, RHS);
+  else
+    NewNode->HandleChildPiece(i-WidthFactor, RHS);
+
+  // Recompute the two nodes' size.
+  NewNode->FullRecomputeSizeLocally();
+  FullRecomputeSizeLocally();
+  return NewNode;
+}
+
+/// erase - Remove NumBytes from this node at the specified offset.  We are
+/// guaranteed that there is a split at Offset.
+void RopePieceBTreeInterior::erase(unsigned Offset, unsigned NumBytes) {
+  // This will shrink this node by NumBytes.
+  Size -= NumBytes;
+
+  // Find the first child that overlaps with Offset.
+  unsigned i = 0;
+  for (; Offset >= getChild(i)->size(); ++i)
+    Offset -= getChild(i)->size();
+
+  // Propagate the delete request into overlapping children, or completely
+  // delete the children as appropriate.
+  while (NumBytes) {
+    RopePieceBTreeNode *CurChild = getChild(i);
+
+    // If we are deleting something contained entirely in the child, pass on the
+    // request.
+    if (Offset+NumBytes < CurChild->size()) {
+      CurChild->erase(Offset, NumBytes);
+      return;
+    }
+
+    // If this deletion request starts somewhere in the middle of the child, it
+    // must be deleting to the end of the child.
+    if (Offset) {
+      unsigned BytesFromChild = CurChild->size()-Offset;
+      CurChild->erase(Offset, BytesFromChild);
+      NumBytes -= BytesFromChild;
+      // Start at the beginning of the next child.
+      Offset = 0;
+      ++i;
+      continue;
+    }
+
+    // If the deletion request completely covers the child, delete it and move
+    // the rest down.
+    NumBytes -= CurChild->size();
+    CurChild->Destroy();
+    --NumChildren;
+    if (i != getNumChildren())
+      memmove(&Children[i], &Children[i+1],
+              (getNumChildren()-i)*sizeof(Children[0]));
+  }
+}
+
+//===----------------------------------------------------------------------===//
+// RopePieceBTreeNode Implementation
+//===----------------------------------------------------------------------===//
+
+void RopePieceBTreeNode::Destroy() {
+  if (RopePieceBTreeLeaf *Leaf = dyn_cast<RopePieceBTreeLeaf>(this))
+    delete Leaf;
+  else
+    delete cast<RopePieceBTreeInterior>(this);
+}
+
+/// split - Split the range containing the specified offset so that we are
+/// guaranteed that there is a place to do an insertion at the specified
+/// offset.  The offset is relative, so "0" is the start of the node.
+///
+/// If there is no space in this subtree for the extra piece, the extra tree
+/// node is returned and must be inserted into a parent.
+RopePieceBTreeNode *RopePieceBTreeNode::split(unsigned Offset) {
+  assert(Offset <= size() && "Invalid offset to split!");
+  if (RopePieceBTreeLeaf *Leaf = dyn_cast<RopePieceBTreeLeaf>(this))
+    return Leaf->split(Offset);
+  return cast<RopePieceBTreeInterior>(this)->split(Offset);
+}
+
+/// insert - Insert the specified ropepiece into this tree node at the
+/// specified offset.  The offset is relative, so "0" is the start of the
+/// node.
+///
+/// If there is no space in this subtree for the extra piece, the extra tree
+/// node is returned and must be inserted into a parent.
+RopePieceBTreeNode *RopePieceBTreeNode::insert(unsigned Offset,
+                                               const RopePiece &R) {
+  assert(Offset <= size() && "Invalid offset to insert!");
+  if (RopePieceBTreeLeaf *Leaf = dyn_cast<RopePieceBTreeLeaf>(this))
+    return Leaf->insert(Offset, R);
+  return cast<RopePieceBTreeInterior>(this)->insert(Offset, R);
+}
+
+/// erase - Remove NumBytes from this node at the specified offset.  We are
+/// guaranteed that there is a split at Offset.
+void RopePieceBTreeNode::erase(unsigned Offset, unsigned NumBytes) {
+  assert(Offset+NumBytes <= size() && "Invalid offset to erase!");
+  if (RopePieceBTreeLeaf *Leaf = dyn_cast<RopePieceBTreeLeaf>(this))
+    return Leaf->erase(Offset, NumBytes);
+  return cast<RopePieceBTreeInterior>(this)->erase(Offset, NumBytes);
+}
+
+
+//===----------------------------------------------------------------------===//
+// RopePieceBTreeIterator Implementation
+//===----------------------------------------------------------------------===//
+
+static const RopePieceBTreeLeaf *getCN(const void *P) {
+  return static_cast<const RopePieceBTreeLeaf*>(P);
+}
+
+// begin iterator.
+RopePieceBTreeIterator::RopePieceBTreeIterator(const void *n) {
+  const RopePieceBTreeNode *N = static_cast<const RopePieceBTreeNode*>(n);
+
+  // Walk down the left side of the tree until we get to a leaf.
+  while (const RopePieceBTreeInterior *IN = dyn_cast<RopePieceBTreeInterior>(N))
+    N = IN->getChild(0);
+
+  // We must have at least one leaf.
+  CurNode = cast<RopePieceBTreeLeaf>(N);
+
+  // If we found a leaf that happens to be empty, skip over it until we get
+  // to something full.
+  while (CurNode && getCN(CurNode)->getNumPieces() == 0)
+    CurNode = getCN(CurNode)->getNextLeafInOrder();
+
+  if (CurNode != 0)
+    CurPiece = &getCN(CurNode)->getPiece(0);
+  else  // Empty tree, this is an end() iterator.
+    CurPiece = 0;
+  CurChar = 0;
+}
+
+void RopePieceBTreeIterator::MoveToNextPiece() {
+  if (CurPiece != &getCN(CurNode)->getPiece(getCN(CurNode)->getNumPieces()-1)) {
+    CurChar = 0;
+    ++CurPiece;
+    return;
+  }
+
+  // Find the next non-empty leaf node.
+  do
+    CurNode = getCN(CurNode)->getNextLeafInOrder();
+  while (CurNode && getCN(CurNode)->getNumPieces() == 0);
+
+  if (CurNode != 0)
+    CurPiece = &getCN(CurNode)->getPiece(0);
+  else // Hit end().
+    CurPiece = 0;
+  CurChar = 0;
+}
+
+//===----------------------------------------------------------------------===//
+// RopePieceBTree Implementation
+//===----------------------------------------------------------------------===//
+
+static RopePieceBTreeNode *getRoot(void *P) {
+  return static_cast<RopePieceBTreeNode*>(P);
+}
+
+RopePieceBTree::RopePieceBTree() {
+  Root = new RopePieceBTreeLeaf();
+}
+RopePieceBTree::RopePieceBTree(const RopePieceBTree &RHS) {
+  assert(RHS.empty() && "Can't copy non-empty tree yet");
+  Root = new RopePieceBTreeLeaf();
+}
+RopePieceBTree::~RopePieceBTree() {
+  getRoot(Root)->Destroy();
+}
+
+unsigned RopePieceBTree::size() const {
+  return getRoot(Root)->size();
+}
+
+void RopePieceBTree::clear() {
+  if (RopePieceBTreeLeaf *Leaf = dyn_cast<RopePieceBTreeLeaf>(getRoot(Root)))
+    Leaf->clear();
+  else {
+    getRoot(Root)->Destroy();
+    Root = new RopePieceBTreeLeaf();
+  }
+}
+
+void RopePieceBTree::insert(unsigned Offset, const RopePiece &R) {
+  // #1. Split at Offset.
+  if (RopePieceBTreeNode *RHS = getRoot(Root)->split(Offset))
+    Root = new RopePieceBTreeInterior(getRoot(Root), RHS);
+
+  // #2. Do the insertion.
+  if (RopePieceBTreeNode *RHS = getRoot(Root)->insert(Offset, R))
+    Root = new RopePieceBTreeInterior(getRoot(Root), RHS);
+}
+
+void RopePieceBTree::erase(unsigned Offset, unsigned NumBytes) {
+  // #1. Split at Offset.
+  if (RopePieceBTreeNode *RHS = getRoot(Root)->split(Offset))
+    Root = new RopePieceBTreeInterior(getRoot(Root), RHS);
+
+  // #2. Do the erasing.
+  getRoot(Root)->erase(Offset, NumBytes);
+}
+
+//===----------------------------------------------------------------------===//
+// RewriteRope Implementation
+//===----------------------------------------------------------------------===//
+
+/// MakeRopeString - This copies the specified byte range into some instance of
+/// RopeRefCountString, and return a RopePiece that represents it.  This uses
+/// the AllocBuffer object to aggregate requests for small strings into one
+/// allocation instead of doing tons of tiny allocations.
+RopePiece RewriteRope::MakeRopeString(const char *Start, const char *End) {
+  unsigned Len = End-Start;
+  assert(Len && "Zero length RopePiece is invalid!");
+
+  // If we have space for this string in the current alloc buffer, use it.
+  if (AllocOffs+Len <= AllocChunkSize) {
+    memcpy(AllocBuffer->Data+AllocOffs, Start, Len);
+    AllocOffs += Len;
+    return RopePiece(AllocBuffer, AllocOffs-Len, AllocOffs);
+  }
+
+  // If we don't have enough room because this specific allocation is huge,
+  // just allocate a new rope piece for it alone.
+  if (Len > AllocChunkSize) {
+    unsigned Size = End-Start+sizeof(RopeRefCountString)-1;
+    RopeRefCountString *Res =
+      reinterpret_cast<RopeRefCountString *>(new char[Size]);
+    Res->RefCount = 0;
+    memcpy(Res->Data, Start, End-Start);
+    return RopePiece(Res, 0, End-Start);
+  }
+
+  // Otherwise, this was a small request but we just don't have space for it
+  // Make a new chunk and share it with later allocations.
+
+  // If we had an old allocation, drop our reference to it.
+  if (AllocBuffer && --AllocBuffer->RefCount == 0)
+    delete [] (char*)AllocBuffer;
+
+  unsigned AllocSize = offsetof(RopeRefCountString, Data) + AllocChunkSize;
+  AllocBuffer = reinterpret_cast<RopeRefCountString *>(new char[AllocSize]);
+  AllocBuffer->RefCount = 0;
+  memcpy(AllocBuffer->Data, Start, Len);
+  AllocOffs = Len;
+
+  // Start out the new allocation with a refcount of 1, since we have an
+  // internal reference to it.
+  AllocBuffer->addRef();
+  return RopePiece(AllocBuffer, 0, Len);
+}
+
+
diff --git a/contrib/llvm/tools/clang/lib/Rewrite/RewriteTest.cpp b/contrib/llvm/tools/clang/lib/Rewrite/RewriteTest.cpp
new file mode 100644
index 0000000..3620700
--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/Rewrite/RewriteTest.cpp
@@ -0,0 +1,39 @@
+//===--- RewriteTest.cpp - Rewriter playground ----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This is a testbed.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/Rewriters.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Rewrite/TokenRewriter.h"
+#include "llvm/Support/raw_ostream.h"
+
+void clang::DoRewriteTest(Preprocessor &PP, llvm::raw_ostream* OS) {
+  SourceManager &SM = PP.getSourceManager();
+  const LangOptions &LangOpts = PP.getLangOptions();
+
+  TokenRewriter Rewriter(SM.getMainFileID(), SM, LangOpts);
+
+  // Throw <i> </i> tags around comments.
+  for (TokenRewriter::token_iterator I = Rewriter.token_begin(),
+       E = Rewriter.token_end(); I != E; ++I) {
+    if (I->isNot(tok::comment)) continue;
+
+    Rewriter.AddTokenBefore(I, "<i>");
+    Rewriter.AddTokenAfter(I, "</i>");
+  }
+
+
+  // Print out the output.
+  for (TokenRewriter::token_iterator I = Rewriter.token_begin(),
+       E = Rewriter.token_end(); I != E; ++I)
+    *OS << PP.getSpelling(*I);
+}
diff --git a/contrib/llvm/tools/clang/lib/Rewrite/Rewriter.cpp b/contrib/llvm/tools/clang/lib/Rewrite/Rewriter.cpp
new file mode 100644
index 0000000..51fe379
--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/Rewrite/Rewriter.cpp
@@ -0,0 +1,397 @@
+//===--- Rewriter.cpp - Code rewriting interface --------------------------===//
+//
+//                     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 Rewriter class, which is used for code
+//  transformations.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/Rewriter.h"
+#include "clang/AST/Stmt.h"
+#include "clang/AST/Decl.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Basic/SourceManager.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace clang;
+
+llvm::raw_ostream &RewriteBuffer::write(llvm::raw_ostream &os) const {
+  // FIXME: eliminate the copy by writing out each chunk at a time
+  os << std::string(begin(), end());
+  return os;
+}
+
+/// \brief Return true if this character is non-new-line whitespace:
+/// ' ', '\t', '\f', '\v', '\r'.
+static inline bool isWhitespace(unsigned char c) {
+  switch (c) {
+  case ' ':
+  case '\t':
+  case '\f':
+  case '\v':
+  case '\r':
+    return true;
+  default:
+    return false;
+  }
+}
+
+void RewriteBuffer::RemoveText(unsigned OrigOffset, unsigned Size,
+                               bool removeLineIfEmpty) {
+  // Nothing to remove, exit early.
+  if (Size == 0) return;
+
+  unsigned RealOffset = getMappedOffset(OrigOffset, true);
+  assert(RealOffset+Size < Buffer.size() && "Invalid location");
+
+  // Remove the dead characters.
+  Buffer.erase(RealOffset, Size);
+
+  // Add a delta so that future changes are offset correctly.
+  AddReplaceDelta(OrigOffset, -Size);
+
+  if (removeLineIfEmpty) {
+    // Find the line that the remove occurred and if it is completely empty
+    // remove the line as well.
+
+    iterator curLineStart = begin();
+    unsigned curLineStartOffs = 0;
+    iterator posI = begin();
+    for (unsigned i = 0; i != RealOffset; ++i) {
+      if (*posI == '\n') {
+        curLineStart = posI;
+        ++curLineStart;
+        curLineStartOffs = i + 1;
+      }
+      ++posI;
+    }
+  
+    unsigned lineSize = 0;
+    posI = curLineStart;
+    while (posI != end() && isWhitespace(*posI)) {
+      ++posI;
+      ++lineSize;
+    }
+    if (posI != end() && *posI == '\n') {
+      Buffer.erase(curLineStartOffs, lineSize + 1/* + '\n'*/);
+      AddReplaceDelta(curLineStartOffs, -(lineSize + 1/* + '\n'*/));
+    }
+  }
+}
+
+void RewriteBuffer::InsertText(unsigned OrigOffset, llvm::StringRef Str,
+                               bool InsertAfter) {
+
+  // Nothing to insert, exit early.
+  if (Str.empty()) return;
+
+  unsigned RealOffset = getMappedOffset(OrigOffset, InsertAfter);
+  Buffer.insert(RealOffset, Str.begin(), Str.end());
+
+  // Add a delta so that future changes are offset correctly.
+  AddInsertDelta(OrigOffset, Str.size());
+}
+
+/// ReplaceText - This method replaces a range of characters in the input
+/// buffer with a new string.  This is effectively a combined "remove+insert"
+/// operation.
+void RewriteBuffer::ReplaceText(unsigned OrigOffset, unsigned OrigLength,
+                                llvm::StringRef NewStr) {
+  unsigned RealOffset = getMappedOffset(OrigOffset, true);
+  Buffer.erase(RealOffset, OrigLength);
+  Buffer.insert(RealOffset, NewStr.begin(), NewStr.end());
+  if (OrigLength != NewStr.size())
+    AddReplaceDelta(OrigOffset, NewStr.size() - OrigLength);
+}
+
+
+//===----------------------------------------------------------------------===//
+// Rewriter class
+//===----------------------------------------------------------------------===//
+
+/// getRangeSize - Return the size in bytes of the specified range if they
+/// are in the same file.  If not, this returns -1.
+int Rewriter::getRangeSize(const CharSourceRange &Range,
+                           RewriteOptions opts) const {
+  if (!isRewritable(Range.getBegin()) ||
+      !isRewritable(Range.getEnd())) return -1;
+
+  FileID StartFileID, EndFileID;
+  unsigned StartOff, EndOff;
+
+  StartOff = getLocationOffsetAndFileID(Range.getBegin(), StartFileID);
+  EndOff   = getLocationOffsetAndFileID(Range.getEnd(), EndFileID);
+
+  if (StartFileID != EndFileID)
+    return -1;
+
+  // If edits have been made to this buffer, the delta between the range may
+  // have changed.
+  std::map<FileID, RewriteBuffer>::const_iterator I =
+    RewriteBuffers.find(StartFileID);
+  if (I != RewriteBuffers.end()) {
+    const RewriteBuffer &RB = I->second;
+    EndOff = RB.getMappedOffset(EndOff, opts.IncludeInsertsAtEndOfRange);
+    StartOff = RB.getMappedOffset(StartOff, !opts.IncludeInsertsAtBeginOfRange);
+  }
+
+
+  // Adjust the end offset to the end of the last token, instead of being the
+  // start of the last token if this is a token range.
+  if (Range.isTokenRange())
+    EndOff += Lexer::MeasureTokenLength(Range.getEnd(), *SourceMgr, *LangOpts);
+
+  return EndOff-StartOff;
+}
+
+int Rewriter::getRangeSize(SourceRange Range, RewriteOptions opts) const {
+  return getRangeSize(CharSourceRange::getTokenRange(Range), opts);
+}
+
+
+/// getRewrittenText - Return the rewritten form of the text in the specified
+/// range.  If the start or end of the range was unrewritable or if they are
+/// in different buffers, this returns an empty string.
+///
+/// Note that this method is not particularly efficient.
+///
+std::string Rewriter::getRewrittenText(SourceRange Range) const {
+  if (!isRewritable(Range.getBegin()) ||
+      !isRewritable(Range.getEnd()))
+    return "";
+
+  FileID StartFileID, EndFileID;
+  unsigned StartOff, EndOff;
+  StartOff = getLocationOffsetAndFileID(Range.getBegin(), StartFileID);
+  EndOff   = getLocationOffsetAndFileID(Range.getEnd(), EndFileID);
+
+  if (StartFileID != EndFileID)
+    return ""; // Start and end in different buffers.
+
+  // If edits have been made to this buffer, the delta between the range may
+  // have changed.
+  std::map<FileID, RewriteBuffer>::const_iterator I =
+    RewriteBuffers.find(StartFileID);
+  if (I == RewriteBuffers.end()) {
+    // If the buffer hasn't been rewritten, just return the text from the input.
+    const char *Ptr = SourceMgr->getCharacterData(Range.getBegin());
+
+    // Adjust the end offset to the end of the last token, instead of being the
+    // start of the last token.
+    EndOff += Lexer::MeasureTokenLength(Range.getEnd(), *SourceMgr, *LangOpts);
+    return std::string(Ptr, Ptr+EndOff-StartOff);
+  }
+
+  const RewriteBuffer &RB = I->second;
+  EndOff = RB.getMappedOffset(EndOff, true);
+  StartOff = RB.getMappedOffset(StartOff);
+
+  // Adjust the end offset to the end of the last token, instead of being the
+  // start of the last token.
+  EndOff += Lexer::MeasureTokenLength(Range.getEnd(), *SourceMgr, *LangOpts);
+
+  // Advance the iterators to the right spot, yay for linear time algorithms.
+  RewriteBuffer::iterator Start = RB.begin();
+  std::advance(Start, StartOff);
+  RewriteBuffer::iterator End = Start;
+  std::advance(End, EndOff-StartOff);
+
+  return std::string(Start, End);
+}
+
+unsigned Rewriter::getLocationOffsetAndFileID(SourceLocation Loc,
+                                              FileID &FID) const {
+  assert(Loc.isValid() && "Invalid location");
+  std::pair<FileID,unsigned> V = SourceMgr->getDecomposedLoc(Loc);
+  FID = V.first;
+  return V.second;
+}
+
+
+/// getEditBuffer - Get or create a RewriteBuffer for the specified FileID.
+///
+RewriteBuffer &Rewriter::getEditBuffer(FileID FID) {
+  std::map<FileID, RewriteBuffer>::iterator I =
+    RewriteBuffers.lower_bound(FID);
+  if (I != RewriteBuffers.end() && I->first == FID)
+    return I->second;
+  I = RewriteBuffers.insert(I, std::make_pair(FID, RewriteBuffer()));
+
+  llvm::StringRef MB = SourceMgr->getBufferData(FID);
+  I->second.Initialize(MB.begin(), MB.end());
+
+  return I->second;
+}
+
+/// InsertText - Insert the specified string at the specified location in the
+/// original buffer.
+bool Rewriter::InsertText(SourceLocation Loc, llvm::StringRef Str,
+                          bool InsertAfter) {
+  if (!isRewritable(Loc)) return true;
+  FileID FID;
+  unsigned StartOffs = getLocationOffsetAndFileID(Loc, FID);
+  getEditBuffer(FID).InsertText(StartOffs, Str, InsertAfter);
+  return false;
+}
+
+bool Rewriter::InsertTextAfterToken(SourceLocation Loc, llvm::StringRef Str) {
+  if (!isRewritable(Loc)) return true;
+  FileID FID;
+  unsigned StartOffs = getLocationOffsetAndFileID(Loc, FID);
+  RewriteOptions rangeOpts;
+  rangeOpts.IncludeInsertsAtBeginOfRange = false;
+  StartOffs += getRangeSize(SourceRange(Loc, Loc), rangeOpts);
+  getEditBuffer(FID).InsertText(StartOffs, Str, /*InsertAfter*/true);
+  return false;
+}
+
+/// RemoveText - Remove the specified text region.
+bool Rewriter::RemoveText(SourceLocation Start, unsigned Length,
+                          RewriteOptions opts) {
+  if (!isRewritable(Start)) return true;
+  FileID FID;
+  unsigned StartOffs = getLocationOffsetAndFileID(Start, FID);
+  getEditBuffer(FID).RemoveText(StartOffs, Length, opts.RemoveLineIfEmpty);
+  return false;
+}
+
+/// ReplaceText - This method replaces a range of characters in the input
+/// buffer with a new string.  This is effectively a combined "remove/insert"
+/// operation.
+bool Rewriter::ReplaceText(SourceLocation Start, unsigned OrigLength,
+                           llvm::StringRef NewStr) {
+  if (!isRewritable(Start)) return true;
+  FileID StartFileID;
+  unsigned StartOffs = getLocationOffsetAndFileID(Start, StartFileID);
+
+  getEditBuffer(StartFileID).ReplaceText(StartOffs, OrigLength, NewStr);
+  return false;
+}
+
+bool Rewriter::ReplaceText(SourceRange range, SourceRange replacementRange) {
+  if (!isRewritable(range.getBegin())) return true;
+  if (!isRewritable(range.getEnd())) return true;
+  if (replacementRange.isInvalid()) return true;
+  SourceLocation start = range.getBegin();
+  unsigned origLength = getRangeSize(range);
+  unsigned newLength = getRangeSize(replacementRange);
+  FileID FID;
+  unsigned newOffs = getLocationOffsetAndFileID(replacementRange.getBegin(),
+                                                FID);
+  llvm::StringRef MB = SourceMgr->getBufferData(FID);
+  return ReplaceText(start, origLength, MB.substr(newOffs, newLength));
+}
+
+/// ReplaceStmt - This replaces a Stmt/Expr with another, using the pretty
+/// printer to generate the replacement code.  This returns true if the input
+/// could not be rewritten, or false if successful.
+bool Rewriter::ReplaceStmt(Stmt *From, Stmt *To) {
+  // Measaure the old text.
+  int Size = getRangeSize(From->getSourceRange());
+  if (Size == -1)
+    return true;
+
+  // Get the new text.
+  std::string SStr;
+  llvm::raw_string_ostream S(SStr);
+  To->printPretty(S, 0, PrintingPolicy(*LangOpts));
+  const std::string &Str = S.str();
+
+  ReplaceText(From->getLocStart(), Size, Str);
+  return false;
+}
+
+std::string Rewriter::ConvertToString(Stmt *From) {
+  std::string SStr;
+  llvm::raw_string_ostream S(SStr);
+  From->printPretty(S, 0, PrintingPolicy(*LangOpts));
+  return S.str();
+}
+
+bool Rewriter::IncreaseIndentation(CharSourceRange range,
+                                   SourceLocation parentIndent) {
+  using llvm::StringRef;
+
+  if (!isRewritable(range.getBegin())) return true;
+  if (!isRewritable(range.getEnd())) return true;
+  if (!isRewritable(parentIndent)) return true;
+
+  FileID StartFileID, EndFileID, parentFileID;
+  unsigned StartOff, EndOff, parentOff;
+
+  StartOff = getLocationOffsetAndFileID(range.getBegin(), StartFileID);
+  EndOff   = getLocationOffsetAndFileID(range.getEnd(), EndFileID);
+  parentOff = getLocationOffsetAndFileID(parentIndent, parentFileID);
+
+  if (StartFileID != EndFileID || StartFileID != parentFileID)
+    return true;
+  if (StartOff >= EndOff || parentOff >= StartOff)
+    return true;
+
+  FileID FID = StartFileID;
+  StringRef MB = SourceMgr->getBufferData(FID);
+
+  unsigned parentLineNo = SourceMgr->getLineNumber(FID, parentOff) - 1;
+  unsigned startLineNo = SourceMgr->getLineNumber(FID, StartOff) - 1;
+  unsigned endLineNo = SourceMgr->getLineNumber(FID, EndOff) - 1;
+  
+  const SrcMgr::ContentCache *
+      Content = SourceMgr->getSLocEntry(FID).getFile().getContentCache();
+  
+  // Find where the line starts for the three offsets.
+  unsigned parentLineOffs = Content->SourceLineCache[parentLineNo];
+  unsigned startLineOffs = Content->SourceLineCache[startLineNo];
+  unsigned endLineOffs = Content->SourceLineCache[endLineNo];
+
+  if (startLineOffs == endLineOffs || startLineOffs == parentLineOffs)
+    return true;
+
+  // Find the whitespace at the start of each line.
+  StringRef parentSpace, startSpace, endSpace;
+  {
+    unsigned i = parentLineOffs;
+    while (isWhitespace(MB[i]))
+      ++i;
+    parentSpace = MB.substr(parentLineOffs, i-parentLineOffs);
+
+    i = startLineOffs;
+    while (isWhitespace(MB[i]))
+      ++i;
+    startSpace = MB.substr(startLineOffs, i-startLineOffs);
+
+    i = endLineOffs;
+    while (isWhitespace(MB[i]))
+      ++i;
+    endSpace = MB.substr(endLineOffs, i-endLineOffs);
+  }
+  if (parentSpace.size() >= startSpace.size())
+    return true;
+  if (!startSpace.startswith(parentSpace))
+    return true;
+
+  llvm::StringRef indent = startSpace.substr(parentSpace.size());
+
+  // Indent the lines between start/end offsets.
+  RewriteBuffer &RB = getEditBuffer(FID);
+  for (unsigned i = startLineOffs; i != endLineOffs; ++i) {
+    if (MB[i] == '\n') {
+      unsigned startOfLine = i+1;
+      if (startOfLine == endLineOffs)
+        break;
+      StringRef origIndent;
+      unsigned ws = startOfLine;
+      while (isWhitespace(MB[ws]))
+        ++ws;
+      origIndent = MB.substr(startOfLine, ws-startOfLine);
+      if (origIndent.startswith(startSpace))
+        RB.InsertText(startOfLine, indent, /*InsertAfter=*/false);
+    }
+  }
+
+  return false;
+}
diff --git a/contrib/llvm/tools/clang/lib/Rewrite/TokenRewriter.cpp b/contrib/llvm/tools/clang/lib/Rewrite/TokenRewriter.cpp
new file mode 100644
index 0000000..03ce63e
--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/Rewrite/TokenRewriter.cpp
@@ -0,0 +1,99 @@
+//===--- TokenRewriter.cpp - Token-based code rewriting interface ---------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file implements the TokenRewriter class, which is used for code
+//  transformations.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/TokenRewriter.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Lex/ScratchBuffer.h"
+#include "clang/Basic/SourceManager.h"
+using namespace clang;
+
+TokenRewriter::TokenRewriter(FileID FID, SourceManager &SM,
+                             const LangOptions &LangOpts) {
+  ScratchBuf.reset(new ScratchBuffer(SM));
+
+  // Create a lexer to lex all the tokens of the main file in raw mode.
+  const llvm::MemoryBuffer *FromFile = SM.getBuffer(FID);
+  Lexer RawLex(FID, FromFile, SM, LangOpts);
+
+  // Return all comments and whitespace as tokens.
+  RawLex.SetKeepWhitespaceMode(true);
+
+  // Lex the file, populating our datastructures.
+  Token RawTok;
+  RawLex.LexFromRawLexer(RawTok);
+  while (RawTok.isNot(tok::eof)) {
+#if 0
+    if (Tok.is(tok::raw_identifier)) {
+      // Look up the identifier info for the token.  This should use
+      // IdentifierTable directly instead of PP.
+      PP.LookUpIdentifierInfo(Tok);
+    }
+#endif
+
+    AddToken(RawTok, TokenList.end());
+    RawLex.LexFromRawLexer(RawTok);
+  }
+}
+
+TokenRewriter::~TokenRewriter() {
+}
+
+
+/// RemapIterator - Convert from token_iterator (a const iterator) to
+/// TokenRefTy (a non-const iterator).
+TokenRewriter::TokenRefTy TokenRewriter::RemapIterator(token_iterator I) {
+  if (I == token_end()) return TokenList.end();
+
+  // FIXME: This is horrible, we should use our own list or something to avoid
+  // this.
+  std::map<SourceLocation, TokenRefTy>::iterator MapIt =
+    TokenAtLoc.find(I->getLocation());
+  assert(MapIt != TokenAtLoc.end() && "iterator not in rewriter?");
+  return MapIt->second;
+}
+
+
+/// AddToken - Add the specified token into the Rewriter before the other
+/// position.
+TokenRewriter::TokenRefTy
+TokenRewriter::AddToken(const Token &T, TokenRefTy Where) {
+  Where = TokenList.insert(Where, T);
+
+  bool InsertSuccess = TokenAtLoc.insert(std::make_pair(T.getLocation(),
+                                                        Where)).second;
+  assert(InsertSuccess && "Token location already in rewriter!");
+  (void)InsertSuccess;
+  return Where;
+}
+
+
+TokenRewriter::token_iterator
+TokenRewriter::AddTokenBefore(token_iterator I, const char *Val) {
+  unsigned Len = strlen(Val);
+
+  // Plop the string into the scratch buffer, then create a token for this
+  // string.
+  Token Tok;
+  Tok.startToken();
+  const char *Spelling;
+  Tok.setLocation(ScratchBuf->getToken(Val, Len, Spelling));
+  Tok.setLength(Len);
+
+  // TODO: Form a whole lexer around this and relex the token!  For now, just
+  // set kind to tok::unknown.
+  Tok.setKind(tok::unknown);
+
+  return AddToken(Tok, RemapIterator(I));
+}
+