diff --git a/lib/CodeGen/CGCXX.cpp b/lib/CodeGen/CGCXX.cpp
index 9674146..7dc4b1e 100644
--- a/lib/CodeGen/CGCXX.cpp
+++ b/lib/CodeGen/CGCXX.cpp
@@ -968,8 +968,7 @@
                           const ThunkAdjustment &ThisAdjustment) {
   
   llvm::SmallString<256> OutName;
-  getMangleContext().mangleThunk(MD, ThisAdjustment.NonVirtual,
-                                 ThisAdjustment.Virtual, OutName);
+  getMangleContext().mangleThunk(MD, ThisAdjustment, OutName);
   
   llvm::GlobalVariable::LinkageTypes linktype;
   linktype = llvm::GlobalValue::WeakAnyLinkage;
diff --git a/lib/CodeGen/CGVtable.h b/lib/CodeGen/CGVtable.h
index af718b3..1d98bed 100644
--- a/lib/CodeGen/CGVtable.h
+++ b/lib/CodeGen/CGVtable.h
@@ -17,6 +17,10 @@
 #include "llvm/ADT/DenseMap.h"
 #include "GlobalDecl.h"
 
+namespace llvm {
+  class Constant;
+}
+
 namespace clang {
   class CXXMethodDecl;
   class CXXRecordDecl;
diff --git a/lib/CodeGen/Mangle.cpp b/lib/CodeGen/Mangle.cpp
index e2ae86b..37061f1 100644
--- a/lib/CodeGen/Mangle.cpp
+++ b/lib/CodeGen/Mangle.cpp
@@ -26,7 +26,9 @@
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/ErrorHandling.h"
+#include "CGVtable.h"
 using namespace clang;
+using namespace CodeGen;
 
 namespace {
   
@@ -67,8 +69,7 @@
   llvm::raw_svector_ostream &getStream() { return Out; }
 
   void mangle(const NamedDecl *D, llvm::StringRef Prefix = "_Z");
-  void mangleCallOffset(int64_t NonVirtualOffset, 
-                        int64_t VirtualOffset);
+  void mangleCallOffset(const ThunkAdjustment &Adjustment);
   void mangleNumber(int64_t Number);
   void mangleFunctionEncoding(const FunctionDecl *FD);
   void mangleName(const NamedDecl *ND);
@@ -348,24 +349,23 @@
   Out << Number;
 }
 
-void CXXNameMangler::mangleCallOffset(int64_t NonVirtualOffset, 
-                                      int64_t VirtualOffset) {
+void CXXNameMangler::mangleCallOffset(const ThunkAdjustment &Adjustment) {
   //  <call-offset>  ::= h <nv-offset> _
   //                 ::= v <v-offset> _
   //  <nv-offset>    ::= <offset number>        # non-virtual base override
   //  <v-offset>     ::= <offset number> _ <virtual offset number>
   //                      # virtual base override, with vcall offset
-  if (!VirtualOffset) {
+  if (!Adjustment.Virtual) {
     Out << 'h';
-    mangleNumber(NonVirtualOffset);
+    mangleNumber(Adjustment.NonVirtual);
     Out << '_';
     return;
   }
   
   Out << 'v';
-  mangleNumber(NonVirtualOffset);
+  mangleNumber(Adjustment.NonVirtual);
   Out << '_';
-  mangleNumber(VirtualOffset);
+  mangleNumber(Adjustment.Virtual);
   Out << '_';
 }
 
@@ -1355,8 +1355,7 @@
 /// \brief Mangles the a thunk with the offset n for the declaration D and
 /// emits that name to the given output stream.
 void MangleContext::mangleThunk(const FunctionDecl *FD, 
-                                int64_t NonVirtualOffset, 
-                                int64_t VirtualOffset,
+                                const ThunkAdjustment &ThisAdjustment,
                                 llvm::SmallVectorImpl<char> &Res) {
   // FIXME: Hum, we might have to thunk these, fix.
   assert(!isa<CXXDestructorDecl>(FD) &&
@@ -1366,7 +1365,7 @@
   //                      # base is the nominal target function of thunk
   CXXNameMangler Mangler(*this, Res);
   Mangler.getStream() << "_ZT";
-  Mangler.mangleCallOffset(NonVirtualOffset, VirtualOffset);
+  Mangler.mangleCallOffset(ThisAdjustment);
   Mangler.mangleFunctionEncoding(FD);
 }
 
@@ -1385,8 +1384,8 @@
   //                      # second call-offset is result adjustment
   CXXNameMangler Mangler(*this, Res);
   Mangler.getStream() << "_ZTc";
-  Mangler.mangleCallOffset(nv_t, v_t);
-  Mangler.mangleCallOffset(nv_r, v_r);
+  Mangler.mangleCallOffset(ThunkAdjustment(nv_t, v_t));
+  Mangler.mangleCallOffset(ThunkAdjustment(nv_r, v_r));
   Mangler.mangleFunctionEncoding(FD);
 }
 
diff --git a/lib/CodeGen/Mangle.h b/lib/CodeGen/Mangle.h
index 15951fe..81b7319 100644
--- a/lib/CodeGen/Mangle.h
+++ b/lib/CodeGen/Mangle.h
@@ -23,18 +23,20 @@
 #include "llvm/ADT/DenseMap.h"
 
 namespace llvm {
-template<typename T>
-class SmallVectorImpl;
+  template<typename T> class SmallVectorImpl;
 }
 
 namespace clang {
-class ASTContext;
-class CXXConstructorDecl;
-class CXXDestructorDecl;
-class FunctionDecl;
-class NamedDecl;
-class VarDecl;
+  class ASTContext;
+  class CXXConstructorDecl;
+  class CXXDestructorDecl;
+  class FunctionDecl;
+  class NamedDecl;
+  class VarDecl;
 
+namespace CodeGen {
+  class ThunkAdjustment;
+   
 /// MangleContext - Context for tracking state which persists across multiple
 /// calls to the C++ name mangler.
 class MangleContext {
@@ -62,7 +64,7 @@
 
   void mangleName(const NamedDecl *D, llvm::SmallVectorImpl<char> &);
   void mangleThunk(const FunctionDecl *FD, 
-                   int64_t NonVirtualOffset, int64_t VirtualOffset,
+                   const ThunkAdjustment &ThisAdjustment,
                    llvm::SmallVectorImpl<char> &);
   void mangleCovariantThunk(const FunctionDecl *FD, int64_t nv_t, int64_t v_t,
                             int64_t nv_r, int64_t v_r,
@@ -82,6 +84,8 @@
 
   /// @}
 };
+  
+}
 }
 
 #endif