Update clang to 91430.

28 files changed, 5964 insertions, 1918 deletions

diff --git a/lib/Sema/CodeCompleteConsumer.cpp b/lib/Sema/CodeCompleteConsumer.cpp
index 91b16d3..d8ed894 100644
--- a/lib/Sema/CodeCompleteConsumer.cpp
+++ b/lib/Sema/CodeCompleteConsumer.cpp
@@ -46,7 +46,7 @@ CodeCompletionString::Chunk::Chunk(ChunkKind Kind, llvm::StringRef Text)
   }
 
   case CK_Optional:
-    llvm::llvm_unreachable("Optional strings cannot be created from text");
+    llvm_unreachable("Optional strings cannot be created from text");
     break;
       
   case CK_LeftParen:
diff --git a/lib/Sema/Lookup.h b/lib/Sema/Lookup.h
index e2134a2..78f79ea 100644
--- a/lib/Sema/Lookup.h
+++ b/lib/Sema/Lookup.h
@@ -26,13 +26,6 @@ namespace clang {
 /// a single declaration, a set of overloaded functions, or an
 /// ambiguity. Use the getKind() method to determine which of these
 /// results occurred for a given lookup.
-///
-/// Any non-ambiguous lookup can be converted into a single
-/// (possibly NULL) @c NamedDecl* via the getAsSingleDecl() method.
-/// This permits the common-case usage in C and Objective-C where
-/// name lookup will always return a single declaration.  Use of
-/// this is largely deprecated; callers should handle the possibility
-/// of multiple declarations.
 class LookupResult {
 public:
   enum LookupResultKind {
@@ -40,12 +33,11 @@ public:
     NotFound = 0,
 
     /// @brief Name lookup found a single declaration that met the
-    /// criteria. getAsDecl will return this declaration.
+    /// criteria.  getFoundDecl() will return this declaration.
     Found,
 
     /// @brief Name lookup found a set of overloaded functions that
-    /// met the criteria. getAsDecl will turn this set of overloaded
-    /// functions into an OverloadedFunctionDecl.
+    /// met the criteria.
     FoundOverloaded,
 
     /// @brief Name lookup found an unresolvable value declaration
@@ -282,13 +274,6 @@ public:
     }
   }
 
-  /// \brief Fetch this as an unambiguous single declaration
-  /// (possibly an overloaded one).
-  ///
-  /// This is deprecated; users should be written to handle
-  /// ambiguous and overloaded lookups.
-  NamedDecl *getAsSingleDecl(ASTContext &Context) const;
-
   template <class DeclClass>
   DeclClass *getAsSingle() const {
     if (getResultKind() != Found) return 0;
diff --git a/lib/Sema/ParseAST.cpp b/lib/Sema/ParseAST.cpp
index 7c7df4b..898b3c2 100644
--- a/lib/Sema/ParseAST.cpp
+++ b/lib/Sema/ParseAST.cpp
@@ -75,7 +75,7 @@ void clang::ParseAST(Preprocessor &PP, ASTConsumer *Consumer,
   while ((ADecl = P.RetrievePendingObjCImpDecl()))
     Consumer->HandleTopLevelDecl(ADecl.getAsVal<DeclGroupRef>());
 
-  // process any TopLevelDecls generated by #pragma weak
+  // Process any TopLevelDecls generated by #pragma weak.
   for (llvm::SmallVector<Decl*,2>::iterator
         I = S.WeakTopLevelDecls().begin(),
         E = S.WeakTopLevelDecls().end(); I != E; ++I)
@@ -83,6 +83,13 @@ void clang::ParseAST(Preprocessor &PP, ASTConsumer *Consumer,
 
   Consumer->HandleTranslationUnit(Ctx);
 
+  if (ExternalSemaSource *ESS =
+        dyn_cast_or_null<ExternalSemaSource>(Ctx.getExternalSource()))
+    ESS->ForgetSema();
+
+  if (SemaConsumer *SC = dyn_cast<SemaConsumer>(Consumer))
+    SC->ForgetSema();
+
   if (PrintStats) {
     fprintf(stderr, "\nSTATISTICS:\n");
     P.getActions().PrintStats();
diff --git a/lib/Sema/Sema.cpp b/lib/Sema/Sema.cpp
index f0812bf..ef61474 100644
--- a/lib/Sema/Sema.cpp
+++ b/lib/Sema/Sema.cpp
@@ -278,20 +278,20 @@ void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
   PushDeclContext(S, Context.getTranslationUnitDecl());
 
   if (PP.getTargetInfo().getPointerWidth(0) >= 64) {
-    DeclaratorInfo *DInfo;
+    TypeSourceInfo *TInfo;
 
     // Install [u]int128_t for 64-bit targets.
-    DInfo = Context.getTrivialDeclaratorInfo(Context.Int128Ty);
+    TInfo = Context.getTrivialTypeSourceInfo(Context.Int128Ty);
     PushOnScopeChains(TypedefDecl::Create(Context, CurContext,
                                           SourceLocation(),
                                           &Context.Idents.get("__int128_t"),
-                                          DInfo), TUScope);
+                                          TInfo), TUScope);
 
-    DInfo = Context.getTrivialDeclaratorInfo(Context.UnsignedInt128Ty);
+    TInfo = Context.getTrivialTypeSourceInfo(Context.UnsignedInt128Ty);
     PushOnScopeChains(TypedefDecl::Create(Context, CurContext,
                                           SourceLocation(),
                                           &Context.Idents.get("__uint128_t"),
-                                          DInfo), TUScope);
+                                          TInfo), TUScope);
   }
 
 
@@ -301,7 +301,7 @@ void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
   if (Context.getObjCSelType().isNull()) {
     // Create the built-in typedef for 'SEL'.
     QualType SelT = Context.getPointerType(Context.ObjCBuiltinSelTy);
-    DeclaratorInfo *SelInfo = Context.getTrivialDeclaratorInfo(SelT);
+    TypeSourceInfo *SelInfo = Context.getTrivialTypeSourceInfo(SelT);
     TypedefDecl *SelTypedef
       = TypedefDecl::Create(Context, CurContext, SourceLocation(),
                             &Context.Idents.get("SEL"), SelInfo);
@@ -322,7 +322,7 @@ void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
   // Create the built-in typedef for 'id'.
   if (Context.getObjCIdType().isNull()) {
     QualType IdT = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy);
-    DeclaratorInfo *IdInfo = Context.getTrivialDeclaratorInfo(IdT);
+    TypeSourceInfo *IdInfo = Context.getTrivialTypeSourceInfo(IdT);
     TypedefDecl *IdTypedef
       = TypedefDecl::Create(Context, CurContext, SourceLocation(),
                             &Context.Idents.get("id"), IdInfo);
@@ -334,7 +334,7 @@ void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
   if (Context.getObjCClassType().isNull()) {
     QualType ClassType
       = Context.getObjCObjectPointerType(Context.ObjCBuiltinClassTy);
-    DeclaratorInfo *ClassInfo = Context.getTrivialDeclaratorInfo(ClassType);
+    TypeSourceInfo *ClassInfo = Context.getTrivialTypeSourceInfo(ClassType);
     TypedefDecl *ClassTypedef
       = TypedefDecl::Create(Context, CurContext, SourceLocation(),
                             &Context.Idents.get("Class"), ClassInfo);
@@ -728,18 +728,27 @@ void Sema::DeleteStmt(StmtTy *S) {
 /// translation unit when EOF is reached and all but the top-level scope is
 /// popped.
 void Sema::ActOnEndOfTranslationUnit() {
-  // C++: Perform implicit template instantiations.
-  //
-  // FIXME: When we perform these implicit instantiations, we do not carefully
-  // keep track of the point of instantiation (C++ [temp.point]). This means
-  // that name lookup that occurs within the template instantiation will
-  // always happen at the end of the translation unit, so it will find
-  // some names that should not be found. Although this is common behavior
-  // for C++ compilers, it is technically wrong. In the future, we either need
-  // to be able to filter the results of name lookup or we need to perform
-  // template instantiations earlier.
-  PerformPendingImplicitInstantiations();
-
+  
+  while (1) {
+    // C++: Perform implicit template instantiations.
+    //
+    // FIXME: When we perform these implicit instantiations, we do not carefully
+    // keep track of the point of instantiation (C++ [temp.point]). This means
+    // that name lookup that occurs within the template instantiation will
+    // always happen at the end of the translation unit, so it will find
+    // some names that should not be found. Although this is common behavior
+    // for C++ compilers, it is technically wrong. In the future, we either need
+    // to be able to filter the results of name lookup or we need to perform
+    // template instantiations earlier.
+    PerformPendingImplicitInstantiations();
+    
+    /// If ProcessPendingClassesWithUnmarkedVirtualMembers ends up marking 
+    /// any virtual member functions it might lead to more pending template
+    /// instantiations, which is why we need to loop here.
+    if (!ProcessPendingClassesWithUnmarkedVirtualMembers())
+      break;
+  }
+  
   // Check for #pragma weak identifiers that were never declared
   // FIXME: This will cause diagnostics to be emitted in a non-determinstic
   // order!  Iterating over a densemap like this is bad.
diff --git a/lib/Sema/Sema.h b/lib/Sema/Sema.h
index b594ece..ada8aa1 100644
--- a/lib/Sema/Sema.h
+++ b/lib/Sema/Sema.h
@@ -32,6 +32,7 @@
 #include "llvm/ADT/OwningPtr.h"
 #include <deque>
 #include <list>
+#include <map>
 #include <string>
 #include <vector>
 
@@ -94,7 +95,10 @@ namespace clang {
   class CXXBasePaths;
   class CXXTemporary;
   class LookupResult;
-
+  class InitializedEntity;
+  class InitializationKind;
+  class InitializationSequence;
+  
 /// BlockSemaInfo - When a block is being parsed, this contains information
 /// about the block.  It is pointed to from Sema::CurBlock.
 struct BlockSemaInfo {
@@ -131,7 +135,7 @@ struct BlockSemaInfo {
   BlockSemaInfo *PrevBlockInfo;
 };
 
-/// \brief Holds a QualType and a DeclaratorInfo* that came out of a declarator
+/// \brief Holds a QualType and a TypeSourceInfo* that came out of a declarator
 /// parsing.
 ///
 /// LocInfoType is a "transient" type, only needed for passing to/from Parser
@@ -144,17 +148,17 @@ class LocInfoType : public Type {
     LocInfo = (1 << TypeClassBitSize) - 1
   };
 
-  DeclaratorInfo *DeclInfo;
+  TypeSourceInfo *DeclInfo;
 
-  LocInfoType(QualType ty, DeclaratorInfo *DInfo)
-    : Type((TypeClass)LocInfo, ty, ty->isDependentType()), DeclInfo(DInfo) {
+  LocInfoType(QualType ty, TypeSourceInfo *TInfo)
+    : Type((TypeClass)LocInfo, ty, ty->isDependentType()), DeclInfo(TInfo) {
     assert(getTypeClass() == (TypeClass)LocInfo && "LocInfo didn't fit in TC?");
   }
   friend class Sema;
 
 public:
   QualType getType() const { return getCanonicalTypeInternal(); }
-  DeclaratorInfo *getDeclaratorInfo() const { return DeclInfo; }
+  TypeSourceInfo *getTypeSourceInfo() const { return DeclInfo; }
 
   virtual void getAsStringInternal(std::string &Str,
                                    const PrintingPolicy &Policy) const;
@@ -335,6 +339,10 @@ public:
   typedef std::vector<std::pair<SourceLocation, Decl *> > 
     PotentiallyReferencedDecls;
 
+  /// \brief A set of diagnostics that may be emitted.
+  typedef std::vector<std::pair<SourceLocation, PartialDiagnostic> >
+    PotentiallyEmittedDiagnostics;
+
   /// \brief Data structure used to record current or nested
   /// expression evaluation contexts.
   struct ExpressionEvaluationContextRecord {
@@ -354,10 +362,14 @@ public:
     /// evaluated.
     PotentiallyReferencedDecls *PotentiallyReferenced;
 
+    /// \brief The set of diagnostics to emit should this potentially
+    /// potentially-evaluated context become evaluated.
+    PotentiallyEmittedDiagnostics *PotentiallyDiagnosed;
+
     ExpressionEvaluationContextRecord(ExpressionEvaluationContext Context,
                                       unsigned NumTemporaries) 
       : Context(Context), NumTemporaries(NumTemporaries), 
-        PotentiallyReferenced(0) { }
+        PotentiallyReferenced(0), PotentiallyDiagnosed(0) { }
 
     void addReferencedDecl(SourceLocation Loc, Decl *Decl) {
       if (!PotentiallyReferenced)
@@ -365,9 +377,17 @@ public:
       PotentiallyReferenced->push_back(std::make_pair(Loc, Decl));
     }
 
+    void addDiagnostic(SourceLocation Loc, const PartialDiagnostic &PD) {
+      if (!PotentiallyDiagnosed)
+        PotentiallyDiagnosed = new PotentiallyEmittedDiagnostics;
+      PotentiallyDiagnosed->push_back(std::make_pair(Loc, PD));
+    }
+
     void Destroy() {
       delete PotentiallyReferenced;
+      delete PotentiallyDiagnosed;
       PotentiallyReferenced = 0;
+      PotentiallyDiagnosed = 0;
     }
   };
 
@@ -517,14 +537,14 @@ public:
   QualType BuildBlockPointerType(QualType T, unsigned Quals,
                                  SourceLocation Loc, DeclarationName Entity);
   QualType GetTypeForDeclarator(Declarator &D, Scope *S,
-                                DeclaratorInfo **DInfo = 0,
+                                TypeSourceInfo **TInfo = 0,
                                 TagDecl **OwnedDecl = 0);
-  DeclaratorInfo *GetDeclaratorInfoForDeclarator(Declarator &D, QualType T);
-  /// \brief Create a LocInfoType to hold the given QualType and DeclaratorInfo.
-  QualType CreateLocInfoType(QualType T, DeclaratorInfo *DInfo);
+  TypeSourceInfo *GetTypeSourceInfoForDeclarator(Declarator &D, QualType T);
+  /// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo.
+  QualType CreateLocInfoType(QualType T, TypeSourceInfo *TInfo);
   DeclarationName GetNameForDeclarator(Declarator &D);
   DeclarationName GetNameFromUnqualifiedId(const UnqualifiedId &Name);
-  static QualType GetTypeFromParser(TypeTy *Ty, DeclaratorInfo **DInfo = 0);
+  static QualType GetTypeFromParser(TypeTy *Ty, TypeSourceInfo **TInfo = 0);
   bool CheckSpecifiedExceptionType(QualType T, const SourceRange &Range);
   bool CheckDistantExceptionSpec(QualType T);
   bool CheckEquivalentExceptionSpec(
@@ -596,23 +616,24 @@ public:
                           SourceLocation NameLoc,
                           unsigned Diagnostic);
   NamedDecl* ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
-                                    QualType R, DeclaratorInfo *DInfo,
+                                    QualType R, TypeSourceInfo *TInfo,
                                     LookupResult &Previous, bool &Redeclaration);
   NamedDecl* ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC,
-                                     QualType R, DeclaratorInfo *DInfo,
+                                     QualType R, TypeSourceInfo *TInfo,
                                      LookupResult &Previous,
                                      MultiTemplateParamsArg TemplateParamLists,
                                      bool &Redeclaration);
   void CheckVariableDeclaration(VarDecl *NewVD, LookupResult &Previous,
                                 bool &Redeclaration);
   NamedDecl* ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
-                                     QualType R, DeclaratorInfo *DInfo,
+                                     QualType R, TypeSourceInfo *TInfo,
                                      LookupResult &Previous,
                                      MultiTemplateParamsArg TemplateParamLists,
                                      bool IsFunctionDefinition,
                                      bool &Redeclaration);
   void AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD);
-  void CheckFunctionDeclaration(FunctionDecl *NewFD, LookupResult &Previous,
+  void CheckFunctionDeclaration(Scope *S,
+                                FunctionDecl *NewFD, LookupResult &Previous,
                                 bool IsExplicitSpecialization,
                                 bool &Redeclaration,
                                 bool &OverloadableAttrRequired);
@@ -710,7 +731,7 @@ public:
                          AccessSpecifier AS);
 
   FieldDecl *CheckFieldDecl(DeclarationName Name, QualType T,
-                            DeclaratorInfo *DInfo,
+                            TypeSourceInfo *TInfo,
                             RecordDecl *Record, SourceLocation Loc,
                             bool Mutable, Expr *BitfieldWidth,
                             SourceLocation TSSL,
@@ -811,19 +832,9 @@ public:
     return NULL;
   }
 
-  /// OverloadingResult - Capture the result of performing overload
-  /// resolution.
-  enum OverloadingResult {
-    OR_Success,             ///< Overload resolution succeeded.
-    OR_No_Viable_Function,  ///< No viable function found.
-    OR_Ambiguous,           ///< Ambiguous candidates found.
-    OR_Deleted              ///< Overload resoltuion refers to a deleted function.
-  };
-
-
   /// Subroutines of ActOnDeclarator().
   TypedefDecl *ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
-                                DeclaratorInfo *DInfo);
+                                TypeSourceInfo *TInfo);
   void MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls);
   bool MergeFunctionDecl(FunctionDecl *New, Decl *Old);
   bool MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old);
@@ -831,8 +842,22 @@ public:
   bool MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old);
 
   /// C++ Overloading.
-  bool IsOverload(FunctionDecl *New, LookupResult &OldDecls,
-                  NamedDecl *&OldDecl);
+  enum OverloadKind {
+    /// This is a legitimate overload: the existing declarations are
+    /// functions or function templates with different signatures.
+    Ovl_Overload,
+
+    /// This is not an overload because the signature exactly matches
+    /// an existing declaration.
+    Ovl_Match,
+
+    /// This is not an overload because the lookup results contain a
+    /// non-function.
+    Ovl_NonFunction
+  };
+  OverloadKind CheckOverload(FunctionDecl *New,
+                             const LookupResult &OldDecls,
+                             NamedDecl *&OldDecl);
   bool IsOverload(FunctionDecl *New, FunctionDecl *Old);
 
   ImplicitConversionSequence
@@ -896,7 +921,8 @@ public:
                                  const char *Flavor, bool Elidable = false);
 
   ImplicitConversionSequence
-  TryObjectArgumentInitialization(Expr *From, CXXMethodDecl *Method);
+  TryObjectArgumentInitialization(QualType FromType, CXXMethodDecl *Method,
+                                  CXXRecordDecl *ActingContext);
   bool PerformObjectArgumentInitialization(Expr *&From, CXXMethodDecl *Method);
 
   ImplicitConversionSequence TryContextuallyConvertToBool(Expr *From);
@@ -922,18 +948,20 @@ public:
                              OverloadCandidateSet& CandidateSet,
                              bool SuppressUserConversions = false);
   void AddMethodCandidate(NamedDecl *Decl,
-                          Expr *Object, Expr **Args, unsigned NumArgs,
+                          QualType ObjectType, Expr **Args, unsigned NumArgs,
                           OverloadCandidateSet& CandidateSet,
                           bool SuppressUserConversion = false,
                           bool ForceRValue = false);
-  void AddMethodCandidate(CXXMethodDecl *Method,
-                          Expr *Object, Expr **Args, unsigned NumArgs,
+  void AddMethodCandidate(CXXMethodDecl *Method, CXXRecordDecl *ActingContext,
+                          QualType ObjectType, Expr **Args, unsigned NumArgs,
                           OverloadCandidateSet& CandidateSet,
                           bool SuppressUserConversions = false,
                           bool ForceRValue = false);
   void AddMethodTemplateCandidate(FunctionTemplateDecl *MethodTmpl,
+                                  CXXRecordDecl *ActingContext,
                          const TemplateArgumentListInfo *ExplicitTemplateArgs,
-                                  Expr *Object, Expr **Args, unsigned NumArgs,
+                                  QualType ObjectType,
+                                  Expr **Args, unsigned NumArgs,
                                   OverloadCandidateSet& CandidateSet,
                                   bool SuppressUserConversions = false,
                                   bool ForceRValue = false);
@@ -944,14 +972,17 @@ public:
                                     bool SuppressUserConversions = false,
                                     bool ForceRValue = false);
   void AddConversionCandidate(CXXConversionDecl *Conversion,
+                              CXXRecordDecl *ActingContext,
                               Expr *From, QualType ToType,
                               OverloadCandidateSet& CandidateSet);
   void AddTemplateConversionCandidate(FunctionTemplateDecl *FunctionTemplate,
+                                      CXXRecordDecl *ActingContext,
                                       Expr *From, QualType ToType,
                                       OverloadCandidateSet &CandidateSet);
   void AddSurrogateCandidate(CXXConversionDecl *Conversion,
+                             CXXRecordDecl *ActingContext,
                              const FunctionProtoType *Proto,
-                             Expr *Object, Expr **Args, unsigned NumArgs,
+                             QualType ObjectTy, Expr **Args, unsigned NumArgs,
                              OverloadCandidateSet& CandidateSet);
   void AddOperatorCandidates(OverloadedOperatorKind Op, Scope *S,
                              SourceLocation OpLoc,
@@ -990,6 +1021,8 @@ public:
   FunctionDecl *ResolveAddressOfOverloadedFunction(Expr *From, QualType ToType,
                                                    bool Complain);
   Expr *FixOverloadedFunctionReference(Expr *E, FunctionDecl *Fn);
+  OwningExprResult FixOverloadedFunctionReference(OwningExprResult, 
+                                                  FunctionDecl *Fn);
 
   void AddOverloadedCallCandidates(llvm::SmallVectorImpl<NamedDecl*>& Callees,
                                    DeclarationName &UnqualifiedName,
@@ -1023,7 +1056,7 @@ public:
                                                       SourceLocation RLoc,
                                                       ExprArg Base,ExprArg Idx);
 
-  ExprResult
+  OwningExprResult
   BuildCallToMemberFunction(Scope *S, Expr *MemExpr,
                             SourceLocation LParenLoc, Expr **Args,
                             unsigned NumArgs, SourceLocation *CommaLocs,
@@ -1107,6 +1140,10 @@ public:
     /// namespace alias definition, ignoring non-namespace names (C++
     /// [basic.lookup.udir]p1).
     LookupNamespaceName,
+    /// Look up all declarations in a scope with the given name,
+    /// including resolved using declarations.  This is appropriate
+    /// for checking redeclarations for a using declaration.
+    LookupUsingDeclName,
     /// Look up an ordinary name that is going to be redeclared as a
     /// name with linkage. This lookup ignores any declarations that
     /// are outside of the current scope unless they have linkage. See
@@ -1115,9 +1152,7 @@ public:
     /// Look up the name of an Objective-C protocol.
     LookupObjCProtocolName,
     /// Look up the name of an Objective-C implementation
-    LookupObjCImplementationName,
-    /// Look up the name of an Objective-C category implementation
-    LookupObjCCategoryImplName
+    LookupObjCImplementationName
   };
 
   enum RedeclarationKind {
@@ -1138,9 +1173,9 @@ public:
     case Sema::LookupTagName:
     case Sema::LookupMemberName:
     case Sema::LookupRedeclarationWithLinkage: // FIXME: check linkage, scoping
+    case Sema::LookupUsingDeclName:
     case Sema::LookupObjCProtocolName:
     case Sema::LookupObjCImplementationName:
-    case Sema::LookupObjCCategoryImplName:
       return D->isInIdentifierNamespace(IDNS);
 
     case Sema::LookupOperatorName:
@@ -1160,7 +1195,7 @@ public:
   }
 
   /// \brief Look up a name, looking for a single declaration.  Return
-  /// null if no unambiguous results were found.
+  /// null if the results were absent, ambiguous, or overloaded.
   ///
   /// It is preferable to use the elaborated form and explicitly handle
   /// ambiguity and overloaded.
@@ -1176,7 +1211,6 @@ public:
                         bool EnteringContext = false);
 
   ObjCProtocolDecl *LookupProtocol(IdentifierInfo *II);
-  ObjCCategoryImplDecl *LookupObjCCategoryImpl(IdentifierInfo *II);
 
   void LookupOverloadedOperatorName(OverloadedOperatorKind Op, Scope *S,
                                     QualType T1, QualType T2,
@@ -1379,7 +1413,7 @@ public:
                                                        StmtArg SynchBody);
 
   VarDecl *BuildExceptionDeclaration(Scope *S, QualType ExDeclType,
-                                     DeclaratorInfo *DInfo,
+                                     TypeSourceInfo *TInfo,
                                      IdentifierInfo *Name,
                                      SourceLocation Loc,
                                      SourceRange Range);
@@ -1438,10 +1472,10 @@ public:
   OwningExprResult ActOnDependentIdExpression(const CXXScopeSpec &SS,
                                               DeclarationName Name,
                                               SourceLocation NameLoc,
-                                              bool CheckForImplicitMember,
+                                              bool isAddressOfOperand,
                                 const TemplateArgumentListInfo *TemplateArgs);
   
-  OwningExprResult BuildDeclRefExpr(NamedDecl *D, QualType Ty,
+  OwningExprResult BuildDeclRefExpr(ValueDecl *D, QualType Ty,
                                     SourceLocation Loc,
                                     const CXXScopeSpec *SS = 0);
   VarDecl *BuildAnonymousStructUnionMemberPath(FieldDecl *Field,
@@ -1451,9 +1485,10 @@ public:
                                            FieldDecl *Field,
                                            Expr *BaseObjectExpr = 0,
                                       SourceLocation OpLoc = SourceLocation());
-  OwningExprResult BuildImplicitMemberReferenceExpr(const CXXScopeSpec &SS,
-                                                    LookupResult &R,
-                                const TemplateArgumentListInfo *TemplateArgs);
+  OwningExprResult BuildImplicitMemberExpr(const CXXScopeSpec &SS,
+                                           LookupResult &R,
+                                const TemplateArgumentListInfo *TemplateArgs,
+                                           bool IsDefiniteInstance);
   bool UseArgumentDependentLookup(const CXXScopeSpec &SS,
                                   const LookupResult &R,
                                   bool HasTrailingLParen);
@@ -1498,7 +1533,7 @@ public:
   virtual OwningExprResult ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
                                         tok::TokenKind Op, ExprArg Input);
 
-  OwningExprResult CreateSizeOfAlignOfExpr(DeclaratorInfo *T,
+  OwningExprResult CreateSizeOfAlignOfExpr(TypeSourceInfo *T,
                                            SourceLocation OpLoc,
                                            bool isSizeOf, SourceRange R);
   OwningExprResult CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc,
@@ -1525,6 +1560,7 @@ public:
                                                    SourceLocation RLoc);
 
   OwningExprResult BuildMemberReferenceExpr(ExprArg Base,
+                                            QualType BaseType,
                                             SourceLocation OpLoc,
                                             bool IsArrow,
                                             const CXXScopeSpec &SS,
@@ -1534,23 +1570,24 @@ public:
                                 const TemplateArgumentListInfo *TemplateArgs);
 
   OwningExprResult BuildMemberReferenceExpr(ExprArg Base,
+                                            QualType BaseType,
                                             SourceLocation OpLoc, bool IsArrow,
                                             const CXXScopeSpec &SS,
                                             LookupResult &R,
                                  const TemplateArgumentListInfo *TemplateArgs);
 
   OwningExprResult LookupMemberExpr(LookupResult &R, Expr *&Base,
-                                    bool IsArrow, SourceLocation OpLoc,
+                                    bool &IsArrow, SourceLocation OpLoc,
                                     const CXXScopeSpec &SS,
                                     NamedDecl *FirstQualifierInScope,
                                     DeclPtrTy ObjCImpDecl);
 
   bool CheckQualifiedMemberReference(Expr *BaseExpr, QualType BaseType,
-                                     NestedNameSpecifier *Qualifier,
-                                     SourceRange QualifierRange,
+                                     const CXXScopeSpec &SS,
                                      const LookupResult &R);
 
   OwningExprResult ActOnDependentMemberExpr(ExprArg Base,
+                                            QualType BaseType,
                                             bool IsArrow,
                                             SourceLocation OpLoc,
                                             const CXXScopeSpec &SS,
@@ -1592,6 +1629,11 @@ public:
                                          MultiExprArg Args,
                                          SourceLocation *CommaLocs,
                                          SourceLocation RParenLoc);
+  OwningExprResult BuildResolvedCallExpr(Expr *Fn,
+                                         NamedDecl *NDecl,
+                                         SourceLocation LParenLoc,
+                                         Expr **Args, unsigned NumArgs,
+                                         SourceLocation RParenLoc);
 
   virtual OwningExprResult ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
                                          TypeTy *Ty, SourceLocation RParenLoc,
@@ -1715,6 +1757,21 @@ public:
                                            SourceLocation IdentLoc,
                                            IdentifierInfo *Ident);
 
+  void HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow);
+  bool CheckUsingShadowDecl(UsingDecl *UD, NamedDecl *Target,
+                            const LookupResult &PreviousDecls);
+  UsingShadowDecl *BuildUsingShadowDecl(Scope *S, UsingDecl *UD,
+                                        NamedDecl *Target);
+
+  bool CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
+                                   bool isTypeName,
+                                   const CXXScopeSpec &SS,
+                                   SourceLocation NameLoc,
+                                   const LookupResult &Previous);
+  bool CheckUsingDeclQualifier(SourceLocation UsingLoc,
+                               const CXXScopeSpec &SS,
+                               SourceLocation NameLoc);
+
   NamedDecl *BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
                                    SourceLocation UsingLoc,
                                    const CXXScopeSpec &SS,
@@ -1727,6 +1784,7 @@ public:
 
   virtual DeclPtrTy ActOnUsingDeclaration(Scope *CurScope,
                                           AccessSpecifier AS,
+                                          bool HasUsingKeyword,
                                           SourceLocation UsingLoc,
                                           const CXXScopeSpec &SS,
                                           UnqualifiedId &Name,
@@ -1809,7 +1867,8 @@ public:
 
   /// getAssignOperatorMethod - Returns the default copy assignmment operator
   /// for the class.
-  CXXMethodDecl *getAssignOperatorMethod(ParmVarDecl *Decl,
+  CXXMethodDecl *getAssignOperatorMethod(SourceLocation CurrentLocation,
+                                         ParmVarDecl *Decl,
                                          CXXRecordDecl *ClassDecl);
 
   /// MaybeBindToTemporary - If the passed in expression has a record type with
@@ -1817,14 +1876,6 @@ public:
   /// it simply returns the passed in expression.
   OwningExprResult MaybeBindToTemporary(Expr *E);
 
-  /// InitializationKind - Represents which kind of C++ initialization
-  /// [dcl.init] a routine is to perform.
-  enum InitializationKind {
-    IK_Direct, ///< Direct initialization
-    IK_Copy,   ///< Copy initialization
-    IK_Default ///< Default initialization
-  };
-
   CXXConstructorDecl *
   TryInitializationByConstructor(QualType ClassType,
                                  Expr **Args, unsigned NumArgs,
@@ -1982,7 +2033,8 @@ public:
                                           IdentifierInfo &II,
                                           QualType ObjectType,
                                           NamedDecl *ScopeLookupResult,
-                                          bool EnteringContext);
+                                          bool EnteringContext,
+                                          bool ErrorRecoveryLookup);
 
   virtual CXXScopeTy *ActOnCXXNestedNameSpecifier(Scope *S,
                                                   const CXXScopeSpec &SS,
@@ -1992,6 +2044,12 @@ public:
                                                   TypeTy *ObjectType,
                                                   bool EnteringContext);
 
+  virtual bool IsInvalidUnlessNestedName(Scope *S,
+                                         const CXXScopeSpec &SS,
+                                         IdentifierInfo &II,
+                                         TypeTy *ObjectType,
+                                         bool EnteringContext);
+  
   /// ActOnCXXNestedNameSpecifier - Called during parsing of a
   /// nested-name-specifier that involves a template-id, e.g.,
   /// "foo::bar<int, float>::", and now we need to build a scope
@@ -2006,6 +2064,8 @@ public:
                                                   SourceRange TypeRange,
                                                   SourceLocation CCLoc);
 
+  virtual bool ShouldEnterDeclaratorScope(Scope *S, const CXXScopeSpec &SS);
+
   /// ActOnCXXEnterDeclaratorScope - Called when a C++ scope specifier (global
   /// scope or nested-name-specifier) is parsed, part of a declarator-id.
   /// After this method is called, according to [C++ 3.4.3p3], names should be
@@ -2102,10 +2162,13 @@ public:
 
   MemInitResult BuildMemberInitializer(FieldDecl *Member, Expr **Args,
                                        unsigned NumArgs, SourceLocation IdLoc,
+                                       SourceLocation LParenLoc,
                                        SourceLocation RParenLoc);
 
-  MemInitResult BuildBaseInitializer(QualType BaseType, Expr **Args,
-                                     unsigned NumArgs, SourceLocation IdLoc,
+  MemInitResult BuildBaseInitializer(QualType BaseType,
+                                     TypeSourceInfo *BaseTInfo,
+                                     Expr **Args, unsigned NumArgs,
+                                     SourceLocation LParenLoc,
                                      SourceLocation RParenLoc,
                                      CXXRecordDecl *ClassDecl);
 
@@ -2119,12 +2182,34 @@ public:
   /// as referenced.
   void MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor);
 
+  /// ClassesWithUnmarkedVirtualMembers - Contains record decls whose virtual
+  /// members might need to be marked as referenced. This is either done when
+  /// the key function definition is emitted (this is handled by by 
+  /// MaybeMarkVirtualMembersReferenced), or at the end of the translation unit
+  /// (done by ProcessPendingClassesWithUnmarkedVirtualMembers).
+  std::map<CXXRecordDecl *, SourceLocation> ClassesWithUnmarkedVirtualMembers;
+
+  /// MaybeMarkVirtualMembersReferenced - If the passed in method is the
+  /// key function of the record decl, will mark virtual member functions as 
+  /// referenced.
+  void MaybeMarkVirtualMembersReferenced(SourceLocation Loc, CXXMethodDecl *MD);
+  
+  /// MarkVirtualMembersReferenced - Will mark all virtual members of the given
+  /// CXXRecordDecl referenced.
+  void MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD);
+
+  /// ProcessPendingClassesWithUnmarkedVirtualMembers - Will process classes 
+  /// that might need to have their virtual members marked as referenced.
+  /// Returns false if no work was done.
+  bool ProcessPendingClassesWithUnmarkedVirtualMembers();
+  
   void AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl);
 
   virtual void ActOnMemInitializers(DeclPtrTy ConstructorDecl,
                                     SourceLocation ColonLoc,
                                     MemInitTy **MemInits, unsigned NumMemInits);
 
+  void CheckCompletedCXXClass(CXXRecordDecl *Record);
   virtual void ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
                                                  DeclPtrTy TagDecl,
                                                  SourceLocation LBrac,
@@ -2168,6 +2253,14 @@ public:
                                        bool Virtual, AccessSpecifier Access,
                                        QualType BaseType,
                                        SourceLocation BaseLoc);
+  
+  /// SetClassDeclAttributesFromBase - Copies class decl traits 
+  /// (such as whether the class has a trivial constructor, 
+  /// trivial destructor etc) from the given base class.
+  void SetClassDeclAttributesFromBase(CXXRecordDecl *Class,
+                                      const CXXRecordDecl *BaseClass,
+                                      bool BaseIsVirtual);
+  
   virtual BaseResult ActOnBaseSpecifier(DeclPtrTy classdecl,
                                         SourceRange SpecifierRange,
                                         bool Virtual, AccessSpecifier Access,
@@ -2208,6 +2301,7 @@ public:
   bool CheckOverridingFunctionAttributes(const CXXMethodDecl *New,
                                          const CXXMethodDecl *Old);
 
+  bool CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange);
   //===--------------------------------------------------------------------===//
   // C++ Access Control
   //
@@ -2452,7 +2546,7 @@ public:
                                  TemplateArgumentListBuilder &Converted);
 
   bool CheckTemplateArgument(TemplateTypeParmDecl *Param,
-                             DeclaratorInfo *Arg);
+                             TypeSourceInfo *Arg);
   bool CheckTemplateArgumentAddressOfObjectOrFunction(Expr *Arg,
                                                       NamedDecl *&Entity);
   bool CheckTemplateArgumentPointerToMember(Expr *Arg, 
@@ -3084,7 +3178,7 @@ public:
 
   void PerformPendingImplicitInstantiations();
 
-  DeclaratorInfo *SubstType(DeclaratorInfo *T,
+  TypeSourceInfo *SubstType(TypeSourceInfo *T,
                             const MultiLevelTemplateArgumentList &TemplateArgs,
                             SourceLocation Loc, DeclarationName Entity);
 
@@ -3490,6 +3584,9 @@ public:
   AssignConvertType CheckPointerTypesForAssignment(QualType lhsType,
                                                    QualType rhsType);
 
+  AssignConvertType CheckObjCPointerTypesForAssignment(QualType lhsType,
+                                                       QualType rhsType);
+
   // Helper function for CheckAssignmentConstraints involving two
   // block pointer types.
   AssignConvertType CheckBlockPointerTypesForAssignment(QualType lhsType,
@@ -3556,6 +3653,9 @@ public:
     Expr *&cond, Expr *&lhs, Expr *&rhs, SourceLocation questionLoc);
   QualType FindCompositePointerType(Expr *&E1, Expr *&E2); // C++ 5.9
 
+  QualType FindCompositeObjCPointerType(Expr *&LHS, Expr *&RHS,
+                                        SourceLocation questionLoc);
+  
   /// type checking for vector binary operators.
   inline QualType CheckVectorOperands(SourceLocation l, Expr *&lex, Expr *&rex);
   inline QualType CheckVectorCompareOperands(Expr *&lex, Expr *&rx,
@@ -3718,6 +3818,10 @@ public:
   virtual void CodeCompleteNamespaceAliasDecl(Scope *S);
   virtual void CodeCompleteOperatorName(Scope *S);
   
+  virtual void CodeCompleteObjCAtDirective(Scope *S, DeclPtrTy ObjCImpDecl,
+                                           bool InInterface);
+  virtual void CodeCompleteObjCAtStatement(Scope *S);
+  virtual void CodeCompleteObjCAtExpression(Scope *S);
   virtual void CodeCompleteObjCPropertyFlags(Scope *S, ObjCDeclSpec &ODS);
   virtual void CodeCompleteObjCPropertyGetter(Scope *S, DeclPtrTy ClassDecl,
                                               DeclPtrTy *Methods,
diff --git a/lib/Sema/SemaAttr.cpp b/lib/Sema/SemaAttr.cpp
index 5769716..095f537 100644
--- a/lib/Sema/SemaAttr.cpp
+++ b/lib/Sema/SemaAttr.cpp
@@ -183,20 +183,19 @@ void Sema::ActOnPragmaUnused(const Token *Identifiers, unsigned NumIdentifiers,
     LookupResult Lookup(*this, Name, Tok.getLocation(), LookupOrdinaryName);
     LookupParsedName(Lookup, curScope, NULL, true);
 
-    NamedDecl *ND = Lookup.getAsSingleDecl(Context);
-
-    if (!ND) {
+    if (Lookup.empty()) {
       Diag(PragmaLoc, diag::warn_pragma_unused_undeclared_var)
         << Name << SourceRange(Tok.getLocation());
       continue;
     }
 
-    if (!isa<VarDecl>(ND) || !cast<VarDecl>(ND)->hasLocalStorage()) {
+    VarDecl *VD = Lookup.getAsSingle<VarDecl>();
+    if (!VD || !VD->hasLocalStorage()) {
       Diag(PragmaLoc, diag::warn_pragma_unused_expected_localvar)
         << Name << SourceRange(Tok.getLocation());
       continue;
     }
 
-    ND->addAttr(::new (Context) UnusedAttr());
+    VD->addAttr(::new (Context) UnusedAttr());
   }
 }
diff --git a/lib/Sema/SemaCXXCast.cpp b/lib/Sema/SemaCXXCast.cpp
index 6b4f87e..814af90 100644
--- a/lib/Sema/SemaCXXCast.cpp
+++ b/lib/Sema/SemaCXXCast.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "Sema.h"
+#include "SemaInit.h"
 #include "clang/AST/ExprCXX.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/CXXInheritance.h"
@@ -539,6 +540,16 @@ static TryCastResult TryStaticCast(Sema &Self, Expr *&SrcExpr,
           return TC_Success;
         }
       }
+      else if (CStyle && DestType->isObjCObjectPointerType()) {
+        // allow c-style cast of objective-c pointers as they are pervasive.
+        Kind = CastExpr::CK_AnyPointerToObjCPointerCast;
+        return TC_Success;
+      }
+      else if (CStyle && DestType->isBlockPointerType()) {
+        // allow c-style cast of void * to block pointers.
+        Kind = CastExpr::CK_AnyPointerToBlockPointerCast;
+        return TC_Success;
+      }
     }
   }
 
@@ -859,7 +870,9 @@ TryStaticImplicitCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
     if (CXXConstructorDecl *Constructor
           = Self.TryInitializationByConstructor(DestType, &SrcExpr, 1,
                                                 OpRange.getBegin(),
-                                                Sema::IK_Direct)) {
+              InitializationKind::CreateDirect(OpRange.getBegin(),
+                                               OpRange.getBegin(), 
+                                               OpRange.getEnd()))) {
       ConversionDecl = Constructor;
       Kind = CastExpr::CK_ConstructorConversion;
       return TC_Success;
@@ -1053,8 +1066,10 @@ static TryCastResult TryReinterpretCast(Sema &Self, Expr *SrcExpr,
     return TC_Failed;
   }
   
-  bool destIsPtr = DestType->isPointerType();
-  bool srcIsPtr = SrcType->isPointerType();
+  bool destIsPtr = 
+    CStyle? DestType->isAnyPointerType() : DestType->isPointerType();
+  bool srcIsPtr = 
+    CStyle ? SrcType->isAnyPointerType() : SrcType->isPointerType();
   if (!destIsPtr && !srcIsPtr) {
     // Except for std::nullptr_t->integer and lvalue->reference, which are
     // handled above, at least one of the two arguments must be a pointer.
@@ -1106,7 +1121,11 @@ static TryCastResult TryReinterpretCast(Sema &Self, Expr *SrcExpr,
     msg = diag::err_bad_cxx_cast_const_away;
     return TC_Failed;
   }
-
+  if (CStyle && DestType->isObjCObjectPointerType()) {
+    Kind = CastExpr::CK_AnyPointerToObjCPointerCast;
+    return TC_Success;
+  }
+  
   // Not casting away constness, so the only remaining check is for compatible
   // pointer categories.
   Kind = CastExpr::CK_BitCast;
@@ -1141,7 +1160,6 @@ static TryCastResult TryReinterpretCast(Sema &Self, Expr *SrcExpr,
   // Void pointers are not specified, but supported by every compiler out there.
   // So we finish by allowing everything that remains - it's got to be two
   // object pointers.
-  Kind = CastExpr::CK_BitCast;
   return TC_Success;
 }
 
diff --git a/lib/Sema/SemaCXXScopeSpec.cpp b/lib/Sema/SemaCXXScopeSpec.cpp
index 34a5b78..039691f 100644
--- a/lib/Sema/SemaCXXScopeSpec.cpp
+++ b/lib/Sema/SemaCXXScopeSpec.cpp
@@ -313,7 +313,10 @@ NamedDecl *Sema::FindFirstQualifierInScope(Scope *S, NestedNameSpecifier *NNS) {
   LookupName(Found, S);
   assert(!Found.isAmbiguous() && "Cannot handle ambiguities here yet");
 
-  NamedDecl *Result = Found.getAsSingleDecl(Context);
+  if (!Found.isSingleResult())
+    return 0;
+
+  NamedDecl *Result = Found.getFoundDecl();
   if (isAcceptableNestedNameSpecifier(Result))
     return Result;
 
@@ -327,6 +330,12 @@ NamedDecl *Sema::FindFirstQualifierInScope(Scope *S, NestedNameSpecifier *NNS) {
 /// that it contains an extra parameter \p ScopeLookupResult, which provides
 /// the result of name lookup within the scope of the nested-name-specifier
 /// that was computed at template definitino time.
+///
+/// If ErrorRecoveryLookup is true, then this call is used to improve error
+/// recovery.  This means that it should not emit diagnostics, it should
+/// just return null on failure.  It also means it should only return a valid
+/// scope if it *knows* that the result is correct.  It should not return in a
+/// dependent context, for example.
 Sema::CXXScopeTy *Sema::BuildCXXNestedNameSpecifier(Scope *S,
                                                     const CXXScopeSpec &SS,
                                                     SourceLocation IdLoc,
@@ -334,7 +343,8 @@ Sema::CXXScopeTy *Sema::BuildCXXNestedNameSpecifier(Scope *S,
                                                     IdentifierInfo &II,
                                                     QualType ObjectType,
                                                   NamedDecl *ScopeLookupResult,
-                                                    bool EnteringContext) {
+                                                    bool EnteringContext,
+                                                    bool ErrorRecoveryLookup) {
   NestedNameSpecifier *Prefix
     = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
 
@@ -400,6 +410,10 @@ Sema::CXXScopeTy *Sema::BuildCXXNestedNameSpecifier(Scope *S,
       ObjectTypeSearchedInScope = true;
     }
   } else if (isDependent) {
+    // Don't speculate if we're just trying to improve error recovery.
+    if (ErrorRecoveryLookup)
+      return 0;
+    
     // We were not able to compute the declaration context for a dependent
     // base object type or prior nested-name-specifier, so this
     // nested-name-specifier refers to an unknown specialization. Just build
@@ -414,7 +428,7 @@ Sema::CXXScopeTy *Sema::BuildCXXNestedNameSpecifier(Scope *S,
   }
 
   // FIXME: Deal with ambiguities cleanly.
-  NamedDecl *SD = Found.getAsSingleDecl(Context);
+  NamedDecl *SD = Found.getAsSingle<NamedDecl>();
   if (isAcceptableNestedNameSpecifier(SD)) {
     if (!ObjectType.isNull() && !ObjectTypeSearchedInScope) {
       // C++ [basic.lookup.classref]p4:
@@ -429,7 +443,7 @@ Sema::CXXScopeTy *Sema::BuildCXXNestedNameSpecifier(Scope *S,
       if (S) {
         LookupResult FoundOuter(*this, &II, IdLoc, LookupNestedNameSpecifierName);
         LookupName(FoundOuter, S);
-        OuterDecl = FoundOuter.getAsSingleDecl(Context);
+        OuterDecl = FoundOuter.getAsSingle<NamedDecl>();
       } else
         OuterDecl = ScopeLookupResult;
 
@@ -439,14 +453,17 @@ Sema::CXXScopeTy *Sema::BuildCXXNestedNameSpecifier(Scope *S,
            !Context.hasSameType(
                             Context.getTypeDeclType(cast<TypeDecl>(OuterDecl)),
                                Context.getTypeDeclType(cast<TypeDecl>(SD))))) {
+             if (ErrorRecoveryLookup)
+               return 0;
+             
              Diag(IdLoc, diag::err_nested_name_member_ref_lookup_ambiguous)
                << &II;
              Diag(SD->getLocation(), diag::note_ambig_member_ref_object_type)
                << ObjectType;
              Diag(OuterDecl->getLocation(), diag::note_ambig_member_ref_scope);
 
-             // Fall through so that we'll pick the name we found in the object type,
-             // since that's probably what the user wanted anyway.
+             // Fall through so that we'll pick the name we found in the object
+             // type, since that's probably what the user wanted anyway.
            }
     }
 
@@ -466,17 +483,21 @@ Sema::CXXScopeTy *Sema::BuildCXXNestedNameSpecifier(Scope *S,
                                        T.getTypePtr());
   }
 
+  // Otherwise, we have an error case.  If we don't want diagnostics, just
+  // return an error now.
+  if (ErrorRecoveryLookup)
+    return 0;
+
   // If we didn't find anything during our lookup, try again with
   // ordinary name lookup, which can help us produce better error
   // messages.
-  if (!SD) {
+  if (Found.empty()) {
     Found.clear(LookupOrdinaryName);
     LookupName(Found, S);
-    SD = Found.getAsSingleDecl(Context);
   }
 
   unsigned DiagID;
-  if (SD)
+  if (!Found.empty())
     DiagID = diag::err_expected_class_or_namespace;
   else if (SS.isSet()) {
     Diag(IdLoc, diag::err_no_member) << &II << LookupCtx << SS.getRange();
@@ -507,7 +528,23 @@ Sema::CXXScopeTy *Sema::ActOnCXXNestedNameSpecifier(Scope *S,
                                                     bool EnteringContext) {
   return BuildCXXNestedNameSpecifier(S, SS, IdLoc, CCLoc, II,
                                      QualType::getFromOpaquePtr(ObjectTypePtr),
-                                     /*ScopeLookupResult=*/0, EnteringContext);
+                                     /*ScopeLookupResult=*/0, EnteringContext,
+                                     false);
+}
+
+/// IsInvalidUnlessNestedName - This method is used for error recovery
+/// purposes to determine whether the specified identifier is only valid as
+/// a nested name specifier, for example a namespace name.  It is
+/// conservatively correct to always return false from this method.
+///
+/// The arguments are the same as those passed to ActOnCXXNestedNameSpecifier.
+bool Sema::IsInvalidUnlessNestedName(Scope *S, const CXXScopeSpec &SS,
+                                     IdentifierInfo &II, TypeTy *ObjectType,
+                                     bool EnteringContext) {
+  return BuildCXXNestedNameSpecifier(S, SS, SourceLocation(), SourceLocation(),
+                                     II, QualType::getFromOpaquePtr(ObjectType),
+                                     /*ScopeLookupResult=*/0, EnteringContext,
+                                     true);
 }
 
 Sema::CXXScopeTy *Sema::ActOnCXXNestedNameSpecifier(Scope *S,
@@ -522,6 +559,44 @@ Sema::CXXScopeTy *Sema::ActOnCXXNestedNameSpecifier(Scope *S,
                                      T.getTypePtr());
 }
 
+bool Sema::ShouldEnterDeclaratorScope(Scope *S, const CXXScopeSpec &SS) {
+  assert(SS.isSet() && "Parser passed invalid CXXScopeSpec.");
+
+  NestedNameSpecifier *Qualifier =
+    static_cast<NestedNameSpecifier*>(SS.getScopeRep());
+
+  // There are only two places a well-formed program may qualify a
+  // declarator: first, when defining a namespace or class member
+  // out-of-line, and second, when naming an explicitly-qualified
+  // friend function.  The latter case is governed by
+  // C++03 [basic.lookup.unqual]p10:
+  //   In a friend declaration naming a member function, a name used
+  //   in the function declarator and not part of a template-argument
+  //   in a template-id is first looked up in the scope of the member
+  //   function's class. If it is not found, or if the name is part of
+  //   a template-argument in a template-id, the look up is as
+  //   described for unqualified names in the definition of the class
+  //   granting friendship.
+  // i.e. we don't push a scope unless it's a class member.
+
+  switch (Qualifier->getKind()) {
+  case NestedNameSpecifier::Global:
+  case NestedNameSpecifier::Namespace:
+    // These are always namespace scopes.  We never want to enter a
+    // namespace scope from anything but a file context.
+    return CurContext->getLookupContext()->isFileContext();
+
+  case NestedNameSpecifier::Identifier:
+  case NestedNameSpecifier::TypeSpec:
+  case NestedNameSpecifier::TypeSpecWithTemplate:
+    // These are never namespace scopes.
+    return true;
+  }
+
+  // Silence bogus warning.
+  return false;
+}
+
 /// ActOnCXXEnterDeclaratorScope - Called when a C++ scope specifier (global
 /// scope or nested-name-specifier) is parsed, part of a declarator-id.
 /// After this method is called, according to [C++ 3.4.3p3], names should be
diff --git a/lib/Sema/SemaChecking.cpp b/lib/Sema/SemaChecking.cpp
index 9060fe6..28de500 100644
--- a/lib/Sema/SemaChecking.cpp
+++ b/lib/Sema/SemaChecking.cpp
@@ -700,30 +700,30 @@ bool Sema::SemaBuiltinPrefetch(CallExpr *TheCall) {
     if (Arg->isTypeDependent())
       continue;
 
-    QualType RWType = Arg->getType();
-
-    const BuiltinType *BT = RWType->getAs<BuiltinType>();
-    llvm::APSInt Result;
-    if (!BT || BT->getKind() != BuiltinType::Int)
-      return Diag(TheCall->getLocStart(), diag::err_prefetch_invalid_argument)
+    if (!Arg->getType()->isIntegralType())
+      return Diag(TheCall->getLocStart(), diag::err_prefetch_invalid_arg_type)
               << Arg->getSourceRange();
 
+    ImpCastExprToType(Arg, Context.IntTy, CastExpr::CK_IntegralCast);
+    TheCall->setArg(i, Arg);
+
     if (Arg->isValueDependent())
       continue;
 
+    llvm::APSInt Result;
     if (!Arg->isIntegerConstantExpr(Result, Context))
-      return Diag(TheCall->getLocStart(), diag::err_prefetch_invalid_argument)
+      return Diag(TheCall->getLocStart(), diag::err_prefetch_invalid_arg_ice)
         << SourceRange(Arg->getLocStart(), Arg->getLocEnd());
 
     // FIXME: gcc issues a warning and rewrites these to 0. These
     // seems especially odd for the third argument since the default
     // is 3.
     if (i == 1) {
-      if (Result.getSExtValue() < 0 || Result.getSExtValue() > 1)
+      if (Result.getLimitedValue() > 1)
         return Diag(TheCall->getLocStart(), diag::err_argument_invalid_range)
              << "0" << "1" << Arg->getSourceRange();
     } else {
-      if (Result.getSExtValue() < 0 || Result.getSExtValue() > 3)
+      if (Result.getLimitedValue() > 3)
         return Diag(TheCall->getLocStart(), diag::err_argument_invalid_range)
             << "0" << "3" << Arg->getSourceRange();
     }
diff --git a/lib/Sema/SemaCodeComplete.cpp b/lib/Sema/SemaCodeComplete.cpp
index b386adb..4ce9330 100644
--- a/lib/Sema/SemaCodeComplete.cpp
+++ b/lib/Sema/SemaCodeComplete.cpp
@@ -45,11 +45,64 @@ namespace {
     /// the result set twice.
     llvm::SmallPtrSet<Decl*, 16> AllDeclsFound;
     
+    typedef std::pair<NamedDecl *, unsigned> DeclIndexPair;
+
+    /// \brief An entry in the shadow map, which is optimized to store
+    /// a single (declaration, index) mapping (the common case) but
+    /// can also store a list of (declaration, index) mappings.
+    class ShadowMapEntry {
+      typedef llvm::SmallVector<DeclIndexPair, 4> DeclIndexPairVector;
+
+      /// \brief Contains either the solitary NamedDecl * or a vector
+      /// of (declaration, index) pairs.
+      llvm::PointerUnion<NamedDecl *, DeclIndexPairVector*> DeclOrVector;
+
+      /// \brief When the entry contains a single declaration, this is
+      /// the index associated with that entry.
+      unsigned SingleDeclIndex;
+
+    public:
+      ShadowMapEntry() : DeclOrVector(), SingleDeclIndex(0) { }
+
+      void Add(NamedDecl *ND, unsigned Index) {
+        if (DeclOrVector.isNull()) {
+          // 0 - > 1 elements: just set the single element information.
+          DeclOrVector = ND;
+          SingleDeclIndex = Index;
+          return;
+        }
+
+        if (NamedDecl *PrevND = DeclOrVector.dyn_cast<NamedDecl *>()) {
+          // 1 -> 2 elements: create the vector of results and push in the
+          // existing declaration.
+          DeclIndexPairVector *Vec = new DeclIndexPairVector;
+          Vec->push_back(DeclIndexPair(PrevND, SingleDeclIndex));
+          DeclOrVector = Vec;
+        }
+
+        // Add the new element to the end of the vector.
+        DeclOrVector.get<DeclIndexPairVector*>()->push_back(
+                                                    DeclIndexPair(ND, Index));
+      }
+
+      void Destroy() {
+        if (DeclIndexPairVector *Vec
+              = DeclOrVector.dyn_cast<DeclIndexPairVector *>()) {
+          delete Vec;
+          DeclOrVector = ((NamedDecl *)0);
+        }
+      }
+
+      // Iteration.
+      class iterator;
+      iterator begin() const;
+      iterator end() const;
+    };
+
     /// \brief A mapping from declaration names to the declarations that have
     /// this name within a particular scope and their index within the list of
     /// results.
-    typedef std::multimap<DeclarationName, 
-                          std::pair<NamedDecl *, unsigned> > ShadowMap;
+    typedef llvm::DenseMap<DeclarationName, ShadowMapEntry> ShadowMap;
     
     /// \brief The semantic analysis object for which results are being 
     /// produced.
@@ -117,6 +170,95 @@ namespace {
   };  
 }
 
+class ResultBuilder::ShadowMapEntry::iterator {
+  llvm::PointerUnion<NamedDecl*, const DeclIndexPair*> DeclOrIterator;
+  unsigned SingleDeclIndex;
+
+public:
+  typedef DeclIndexPair value_type;
+  typedef value_type reference;
+  typedef std::ptrdiff_t difference_type;
+  typedef std::input_iterator_tag iterator_category;
+        
+  class pointer {
+    DeclIndexPair Value;
+
+  public:
+    pointer(const DeclIndexPair &Value) : Value(Value) { }
+
+    const DeclIndexPair *operator->() const {
+      return &Value;
+    }
+  };
+        
+  iterator() : DeclOrIterator((NamedDecl *)0), SingleDeclIndex(0) { }
+
+  iterator(NamedDecl *SingleDecl, unsigned Index)
+    : DeclOrIterator(SingleDecl), SingleDeclIndex(Index) { }
+
+  iterator(const DeclIndexPair *Iterator)
+    : DeclOrIterator(Iterator), SingleDeclIndex(0) { }
+
+  iterator &operator++() {
+    if (DeclOrIterator.is<NamedDecl *>()) {
+      DeclOrIterator = (NamedDecl *)0;
+      SingleDeclIndex = 0;
+      return *this;
+    }
+
+    const DeclIndexPair *I = DeclOrIterator.get<const DeclIndexPair*>();
+    ++I;
+    DeclOrIterator = I;
+    return *this;
+  }
+
+  iterator operator++(int) {
+    iterator tmp(*this);
+    ++(*this);
+    return tmp;
+  }
+
+  reference operator*() const {
+    if (NamedDecl *ND = DeclOrIterator.dyn_cast<NamedDecl *>())
+      return reference(ND, SingleDeclIndex);
+
+    return *DeclOrIterator.get<const DeclIndexPair*>();
+  }
+
+  pointer operator->() const {
+    return pointer(**this);
+  }
+
+  friend bool operator==(const iterator &X, const iterator &Y) {
+    return X.DeclOrIterator.getOpaqueValue()
+                                  == Y.DeclOrIterator.getOpaqueValue() &&
+      X.SingleDeclIndex == Y.SingleDeclIndex;
+  }
+
+  friend bool operator!=(const iterator &X, const iterator &Y) {
+    return !(X == Y);
+  }
+};
+
+ResultBuilder::ShadowMapEntry::iterator 
+ResultBuilder::ShadowMapEntry::begin() const {
+  if (DeclOrVector.isNull())
+    return iterator();
+
+  if (NamedDecl *ND = DeclOrVector.dyn_cast<NamedDecl *>())
+    return iterator(ND, SingleDeclIndex);
+
+  return iterator(DeclOrVector.get<DeclIndexPairVector *>()->begin());
+}
+
+ResultBuilder::ShadowMapEntry::iterator 
+ResultBuilder::ShadowMapEntry::end() const {
+  if (DeclOrVector.is<NamedDecl *>() || DeclOrVector.isNull())
+    return iterator();
+
+  return iterator(DeclOrVector.get<DeclIndexPairVector *>()->end());
+}
+
 /// \brief Determines whether the given hidden result could be found with
 /// some extra work, e.g., by qualifying the name.
 ///
@@ -214,7 +356,16 @@ void ResultBuilder::MaybeAddResult(Result R, DeclContext *CurContext) {
   if (isa<FriendDecl>(CanonDecl) || 
       (IDNS & (Decl::IDNS_OrdinaryFriend | Decl::IDNS_TagFriend)))
     return;
+
+  // Class template (partial) specializations are never added as results.
+  if (isa<ClassTemplateSpecializationDecl>(CanonDecl) ||
+      isa<ClassTemplatePartialSpecializationDecl>(CanonDecl))
+    return;
   
+  // Using declarations themselves are never added as results.
+  if (isa<UsingDecl>(CanonDecl))
+    return;
+
   if (const IdentifierInfo *Id = R.Declaration->getIdentifier()) {
     // __va_list_tag is a freak of nature. Find it and skip it.
     if (Id->isStr("__va_list_tag") || Id->isStr("__builtin_va_list"))
@@ -241,14 +392,18 @@ void ResultBuilder::MaybeAddResult(Result R, DeclContext *CurContext) {
     return;
   
   ShadowMap &SMap = ShadowMaps.back();
-  ShadowMap::iterator I, IEnd;
-  for (llvm::tie(I, IEnd) = SMap.equal_range(R.Declaration->getDeclName());
-       I != IEnd; ++I) {
-    NamedDecl *ND = I->second.first;
-    unsigned Index = I->second.second;
+  ShadowMapEntry::iterator I, IEnd;
+  ShadowMap::iterator NamePos = SMap.find(R.Declaration->getDeclName());
+  if (NamePos != SMap.end()) {
+    I = NamePos->second.begin();
+    IEnd = NamePos->second.end();
+  }
+
+  for (; I != IEnd; ++I) {
+    NamedDecl *ND = I->first;
+    unsigned Index = I->second;
     if (ND->getCanonicalDecl() == CanonDecl) {
       // This is a redeclaration. Always pick the newer declaration.
-      I->second.first = R.Declaration;
       Results[Index].Declaration = R.Declaration;
       
       // Pick the best rank of the two.
@@ -265,23 +420,28 @@ void ResultBuilder::MaybeAddResult(Result R, DeclContext *CurContext) {
   std::list<ShadowMap>::iterator SM, SMEnd = ShadowMaps.end();
   --SMEnd;
   for (SM = ShadowMaps.begin(); SM != SMEnd; ++SM) {
-    for (llvm::tie(I, IEnd) = SM->equal_range(R.Declaration->getDeclName());
-         I != IEnd; ++I) {
+    ShadowMapEntry::iterator I, IEnd;
+    ShadowMap::iterator NamePos = SM->find(R.Declaration->getDeclName());
+    if (NamePos != SM->end()) {
+      I = NamePos->second.begin();
+      IEnd = NamePos->second.end();
+    }
+    for (; I != IEnd; ++I) {
       // A tag declaration does not hide a non-tag declaration.
-      if (I->second.first->getIdentifierNamespace() == Decl::IDNS_Tag &&
+      if (I->first->getIdentifierNamespace() == Decl::IDNS_Tag &&
           (IDNS & (Decl::IDNS_Member | Decl::IDNS_Ordinary | 
                    Decl::IDNS_ObjCProtocol)))
         continue;
       
       // Protocols are in distinct namespaces from everything else.
-      if (((I->second.first->getIdentifierNamespace() & Decl::IDNS_ObjCProtocol)
+      if (((I->first->getIdentifierNamespace() & Decl::IDNS_ObjCProtocol)
            || (IDNS & Decl::IDNS_ObjCProtocol)) &&
-          I->second.first->getIdentifierNamespace() != IDNS)
+          I->first->getIdentifierNamespace() != IDNS)
         continue;
       
       // The newly-added result is hidden by an entry in the shadow map.
       if (canHiddenResultBeFound(SemaRef.getLangOptions(), R.Declaration, 
-                                 I->second.first)) {
+                                 I->first)) {
         // Note that this result was hidden.
         R.Hidden = true;
         R.QualifierIsInformative = false;
@@ -327,8 +487,7 @@ void ResultBuilder::MaybeAddResult(Result R, DeclContext *CurContext) {
     
   // Insert this result into the set of results and into the current shadow
   // map.
-  SMap.insert(std::make_pair(R.Declaration->getDeclName(),
-                             std::make_pair(R.Declaration, Results.size())));
+  SMap[R.Declaration->getDeclName()].Add(R.Declaration, Results.size());
   Results.push_back(R);
 }
 
@@ -339,6 +498,12 @@ void ResultBuilder::EnterNewScope() {
 
 /// \brief Exit from the current scope.
 void ResultBuilder::ExitScope() {
+  for (ShadowMap::iterator E = ShadowMaps.back().begin(),
+                        EEnd = ShadowMaps.back().end();
+       E != EEnd;
+       ++E)
+    E->second.Destroy();
+         
   ShadowMaps.pop_back();
 }
 
@@ -403,18 +568,20 @@ bool ResultBuilder::IsNamespaceOrAlias(NamedDecl *ND) const {
   return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND);
 }
 
-/// \brief Brief determines whether the given declaration is a namespace or
-/// namespace alias.
+/// \brief Determines whether the given declaration is a type.
 bool ResultBuilder::IsType(NamedDecl *ND) const {
   return isa<TypeDecl>(ND);
 }
 
-/// \brief Since every declaration found within a class is a member that we
-/// care about, always returns true. This predicate exists mostly to 
-/// communicate to the result builder that we are performing a lookup for
-/// member access.
+/// \brief Determines which members of a class should be visible via
+/// "." or "->".  Only value declarations, nested name specifiers, and
+/// using declarations thereof should show up.
 bool ResultBuilder::IsMember(NamedDecl *ND) const {
-  return true;
+  if (UsingShadowDecl *Using = dyn_cast<UsingShadowDecl>(ND))
+    ND = Using->getTargetDecl();
+
+  return isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND) ||
+    isa<ObjCPropertyDecl>(ND);
 }
 
 // Find the next outer declaration context corresponding to this scope.
@@ -615,7 +782,7 @@ static unsigned CollectLookupResults(Scope *S,
 }
 
 /// \brief Add type specifiers for the current language as keyword results.
-static void AddTypeSpecifierResults(const LangOptions &LangOpts, unsigned Rank, 
+static void AddTypeSpecifierResults(const LangOptions &LangOpts, unsigned Rank,
                                     ResultBuilder &Results) {
   typedef CodeCompleteConsumer::Result Result;
   Results.MaybeAddResult(Result("short", Rank));
@@ -773,10 +940,11 @@ static void AddTemplateParameterChunks(ASTContext &Context,
 
 /// \brief Add a qualifier to the given code-completion string, if the
 /// provided nested-name-specifier is non-NULL.
-void AddQualifierToCompletionString(CodeCompletionString *Result, 
-                                    NestedNameSpecifier *Qualifier, 
-                                    bool QualifierIsInformative,
-                                    ASTContext &Context) {
+static void 
+AddQualifierToCompletionString(CodeCompletionString *Result, 
+                               NestedNameSpecifier *Qualifier, 
+                               bool QualifierIsInformative,
+                               ASTContext &Context) {
   if (!Qualifier)
     return;
   
@@ -791,6 +959,23 @@ void AddQualifierToCompletionString(CodeCompletionString *Result,
     Result->AddTextChunk(PrintedNNS);
 }
 
+static void AddFunctionTypeQualsToCompletionString(CodeCompletionString *Result,
+                                                   FunctionDecl *Function) {
+  const FunctionProtoType *Proto
+    = Function->getType()->getAs<FunctionProtoType>();
+  if (!Proto || !Proto->getTypeQuals())
+    return;
+
+  std::string QualsStr;
+  if (Proto->getTypeQuals() & Qualifiers::Const)
+    QualsStr += " const";
+  if (Proto->getTypeQuals() & Qualifiers::Volatile)
+    QualsStr += " volatile";
+  if (Proto->getTypeQuals() & Qualifiers::Restrict)
+    QualsStr += " restrict";
+  Result->AddInformativeChunk(QualsStr);
+}
+
 /// \brief If possible, create a new code completion string for the given
 /// result.
 ///
@@ -864,6 +1049,7 @@ CodeCompleteConsumer::Result::CreateCodeCompletionString(Sema &S) {
     Result->AddChunk(Chunk(CodeCompletionString::CK_LeftParen));
     AddFunctionParameterChunks(S.Context, Function, Result);
     Result->AddChunk(Chunk(CodeCompletionString::CK_RightParen));
+    AddFunctionTypeQualsToCompletionString(Result, Function);
     return Result;
   }
   
@@ -917,6 +1103,7 @@ CodeCompleteConsumer::Result::CreateCodeCompletionString(Sema &S) {
     Result->AddChunk(Chunk(CodeCompletionString::CK_LeftParen));
     AddFunctionParameterChunks(S.Context, Function, Result);
     Result->AddChunk(Chunk(CodeCompletionString::CK_RightParen));
+    AddFunctionTypeQualsToCompletionString(Result, Function);
     return Result;
   }
   
@@ -1064,13 +1251,54 @@ namespace {
     typedef CodeCompleteConsumer::Result Result;
     
     bool isEarlierDeclarationName(DeclarationName X, DeclarationName Y) const {
-      if (!X.getObjCSelector().isNull() && !Y.getObjCSelector().isNull()) {
-        // Consider all selector kinds to be equivalent.
-      } else if (X.getNameKind() != Y.getNameKind())
+      Selector XSel = X.getObjCSelector();
+      Selector YSel = Y.getObjCSelector();
+      if (!XSel.isNull() && !YSel.isNull()) {
+        // We are comparing two selectors.
+        unsigned N = std::min(XSel.getNumArgs(), YSel.getNumArgs());
+        if (N == 0)
+          ++N;
+        for (unsigned I = 0; I != N; ++I) {
+          IdentifierInfo *XId = XSel.getIdentifierInfoForSlot(I);
+          IdentifierInfo *YId = YSel.getIdentifierInfoForSlot(I);
+          if (!XId || !YId)
+            return XId && !YId;
+          
+          switch (XId->getName().compare_lower(YId->getName())) {
+          case -1: return true;
+          case 1: return false;
+          default: break;
+          }
+        }
+    
+        return XSel.getNumArgs() < YSel.getNumArgs();
+      }
+
+      // For non-selectors, order by kind.
+      if (X.getNameKind() != Y.getNameKind())
         return X.getNameKind() < Y.getNameKind();
       
-      return llvm::LowercaseString(X.getAsString()) 
-        < llvm::LowercaseString(Y.getAsString());
+      // Order identifiers by comparison of their lowercased names.
+      if (IdentifierInfo *XId = X.getAsIdentifierInfo())
+        return XId->getName().compare_lower(
+                                     Y.getAsIdentifierInfo()->getName()) < 0;
+
+      // Order overloaded operators by the order in which they appear
+      // in our list of operators.
+      if (OverloadedOperatorKind XOp = X.getCXXOverloadedOperator())
+        return XOp < Y.getCXXOverloadedOperator();
+
+      // Order C++0x user-defined literal operators lexically by their
+      // lowercased suffixes.
+      if (IdentifierInfo *XLit = X.getCXXLiteralIdentifier())
+        return XLit->getName().compare_lower(
+                                  Y.getCXXLiteralIdentifier()->getName()) < 0;
+
+      // The only stable ordering we have is to turn the name into a
+      // string and then compare the lower-case strings. This is
+      // inefficient, but thankfully does not happen too often.
+      return llvm::StringRef(X.getAsString()).compare_lower(
+                                                 Y.getAsString()) < 0;
     }
     
     bool operator()(const Result &X, const Result &Y) const {
@@ -1088,7 +1316,7 @@ namespace {
                                                    : X.Pattern->getTypedText();
         const char *YStr = (Y.Kind == Result::RK_Keyword)? Y.Keyword 
                                                    : Y.Pattern->getTypedText();
-        return strcmp(XStr, YStr) < 0;
+        return llvm::StringRef(XStr).compare_lower(YStr) < 0;
       }
       
       // Result kinds are ordered by decreasing importance.
@@ -1113,12 +1341,11 @@ namespace {
                                           Y.Declaration->getDeclName());
           
         case Result::RK_Macro:
-          return llvm::LowercaseString(X.Macro->getName()) < 
-                   llvm::LowercaseString(Y.Macro->getName());
+          return X.Macro->getName().compare_lower(Y.Macro->getName()) < 0;
           
         case Result::RK_Keyword:
         case Result::RK_Pattern:
-          llvm::llvm_unreachable("Result kinds handled above");
+          llvm_unreachable("Result kinds handled above");
           break;
       }
       
@@ -1153,9 +1380,23 @@ static void HandleCodeCompleteResults(Sema *S,
 }
 
 void Sema::CodeCompleteOrdinaryName(Scope *S) {
+  typedef CodeCompleteConsumer::Result Result;
   ResultBuilder Results(*this, &ResultBuilder::IsOrdinaryName);
   unsigned NextRank = CollectLookupResults(S, Context.getTranslationUnitDecl(), 
                                            0, CurContext, Results);
+
+  Results.EnterNewScope();
+  AddTypeSpecifierResults(getLangOptions(), NextRank, Results);
+  
+  if (getLangOptions().ObjC1) {
+    // Add the "super" keyword, if appropriate.
+    if (ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(CurContext))
+      if (Method->getClassInterface()->getSuperClass())
+        Results.MaybeAddResult(Result("super", NextRank));
+  }
+
+  Results.ExitScope();
+
   if (CodeCompleter->includeMacros())
     AddMacroResults(PP, NextRank, Results);
   HandleCodeCompleteResults(this, CodeCompleter, Results.data(),Results.size());
@@ -1257,6 +1498,8 @@ void Sema::CodeCompleteMemberReferenceExpr(Scope *S, ExprTy *BaseE,
 
       // We could have the start of a nested-name-specifier. Add those
       // results as well.
+      // FIXME: We should really walk base classes to produce
+      // nested-name-specifiers so that we produce more-precise results.
       Results.setFilter(&ResultBuilder::IsNestedNameSpecifier);
       CollectLookupResults(S, Context.getTranslationUnitDecl(), NextRank,
                            CurContext, Results);
@@ -1448,14 +1691,21 @@ void Sema::CodeCompleteCall(Scope *S, ExprTy *FnIn,
                             ExprTy **ArgsIn, unsigned NumArgs) {
   if (!CodeCompleter)
     return;
-  
+
+  // When we're code-completing for a call, we fall back to ordinary
+  // name code-completion whenever we can't produce specific
+  // results. We may want to revisit this strategy in the future,
+  // e.g., by merging the two kinds of results.
+
   Expr *Fn = (Expr *)FnIn;
   Expr **Args = (Expr **)ArgsIn;
-  
+
   // Ignore type-dependent call expressions entirely.
   if (Fn->isTypeDependent() || 
-      Expr::hasAnyTypeDependentArguments(Args, NumArgs))
+      Expr::hasAnyTypeDependentArguments(Args, NumArgs)) {
+    CodeCompleteOrdinaryName(S);
     return;
+  }
   
   llvm::SmallVector<NamedDecl*,8> Fns;
   DeclarationName UnqualifiedName;
@@ -1498,8 +1748,12 @@ void Sema::CodeCompleteCall(Scope *S, ExprTy *FnIn,
     if (Cand->Viable)
       Results.push_back(ResultCandidate(Cand->Function));
   }
-  CodeCompleter->ProcessOverloadCandidates(*this, NumArgs, Results.data(), 
-                                           Results.size());
+
+  if (Results.empty())
+    CodeCompleteOrdinaryName(S);
+  else
+    CodeCompleter->ProcessOverloadCandidates(*this, NumArgs, Results.data(), 
+                                             Results.size());
 }
 
 void Sema::CodeCompleteQualifiedId(Scope *S, const CXXScopeSpec &SS,
@@ -1510,7 +1764,12 @@ void Sema::CodeCompleteQualifiedId(Scope *S, const CXXScopeSpec &SS,
   DeclContext *Ctx = computeDeclContext(SS, EnteringContext);
   if (!Ctx)
     return;
-  
+
+  // Try to instantiate any non-dependent declaration contexts before
+  // we look in them.
+  if (!isDependentScopeSpecifier(SS) && RequireCompleteDeclContext(SS))
+    return;
+
   ResultBuilder Results(*this);
   unsigned NextRank = CollectMemberLookupResults(Ctx, 0, Ctx, Results);
   
@@ -1644,6 +1903,183 @@ void Sema::CodeCompleteOperatorName(Scope *S) {
   HandleCodeCompleteResults(this, CodeCompleter, Results.data(),Results.size());
 }
 
+void Sema::CodeCompleteObjCAtDirective(Scope *S, DeclPtrTy ObjCImpDecl,
+                                       bool InInterface) {
+  typedef CodeCompleteConsumer::Result Result;
+  ResultBuilder Results(*this);
+  Results.EnterNewScope();
+  if (ObjCImpDecl) {
+    // Since we have an implementation, we can end it.
+    Results.MaybeAddResult(Result("end", 0));
+
+    CodeCompletionString *Pattern = 0;
+    Decl *ImpDecl = ObjCImpDecl.getAs<Decl>();
+    if (isa<ObjCImplementationDecl>(ImpDecl) || 
+        isa<ObjCCategoryImplDecl>(ImpDecl)) {
+      // @dynamic
+      Pattern = new CodeCompletionString;
+      Pattern->AddTypedTextChunk("dynamic");
+      Pattern->AddTextChunk(" ");
+      Pattern->AddPlaceholderChunk("property");
+      Results.MaybeAddResult(Result(Pattern, 0));
+
+      // @synthesize
+      Pattern = new CodeCompletionString;
+      Pattern->AddTypedTextChunk("synthesize");
+      Pattern->AddTextChunk(" ");
+      Pattern->AddPlaceholderChunk("property");
+      Results.MaybeAddResult(Result(Pattern, 0));
+    }
+  } else if (InInterface) {
+    // Since we have an interface or protocol, we can end it.
+    Results.MaybeAddResult(Result("end", 0));
+
+    if (LangOpts.ObjC2) {
+      // @property
+      Results.MaybeAddResult(Result("property", 0));
+    }
+
+    // @required
+    Results.MaybeAddResult(Result("required", 0));
+
+    // @optional
+    Results.MaybeAddResult(Result("optional", 0));
+  } else {
+    CodeCompletionString *Pattern = 0;
+
+    // @class name ;
+    Pattern = new CodeCompletionString;
+    Pattern->AddTypedTextChunk("class");
+    Pattern->AddTextChunk(" ");
+    Pattern->AddPlaceholderChunk("identifier");
+    Pattern->AddTextChunk(";"); // add ';' chunk
+    Results.MaybeAddResult(Result(Pattern, 0));
+
+    // @interface name 
+    // FIXME: Could introduce the whole pattern, including superclasses and 
+    // such.
+    Pattern = new CodeCompletionString;
+    Pattern->AddTypedTextChunk("interface");
+    Pattern->AddTextChunk(" ");
+    Pattern->AddPlaceholderChunk("class");
+    Results.MaybeAddResult(Result(Pattern, 0));
+
+    // @protocol name
+    Pattern = new CodeCompletionString;
+    Pattern->AddTypedTextChunk("protocol");
+    Pattern->AddTextChunk(" ");
+    Pattern->AddPlaceholderChunk("protocol");
+    Results.MaybeAddResult(Result(Pattern, 0));
+
+    // @implementation name
+    Pattern = new CodeCompletionString;
+    Pattern->AddTypedTextChunk("implementation");
+    Pattern->AddTextChunk(" ");
+    Pattern->AddPlaceholderChunk("class");
+    Results.MaybeAddResult(Result(Pattern, 0));
+
+    // @compatibility_alias name
+    Pattern = new CodeCompletionString;
+    Pattern->AddTypedTextChunk("compatibility_alias");
+    Pattern->AddTextChunk(" ");
+    Pattern->AddPlaceholderChunk("alias");
+    Pattern->AddTextChunk(" ");
+    Pattern->AddPlaceholderChunk("class");
+    Results.MaybeAddResult(Result(Pattern, 0));
+  }
+  Results.ExitScope();
+  HandleCodeCompleteResults(this, CodeCompleter, Results.data(),Results.size());
+}
+
+static void AddObjCExpressionResults(unsigned Rank, ResultBuilder &Results) {
+  typedef CodeCompleteConsumer::Result Result;
+  CodeCompletionString *Pattern = 0;
+
+  // @encode ( type-name )
+  Pattern = new CodeCompletionString;
+  Pattern->AddTypedTextChunk("encode");
+  Pattern->AddChunk(CodeCompletionString::CK_LeftParen);
+  Pattern->AddPlaceholderChunk("type-name");
+  Pattern->AddChunk(CodeCompletionString::CK_RightParen);
+  Results.MaybeAddResult(Result(Pattern, Rank));
+  
+  // @protocol ( protocol-name )
+  Pattern = new CodeCompletionString;
+  Pattern->AddTypedTextChunk("protocol");
+  Pattern->AddChunk(CodeCompletionString::CK_LeftParen);
+  Pattern->AddPlaceholderChunk("protocol-name");
+  Pattern->AddChunk(CodeCompletionString::CK_RightParen);
+  Results.MaybeAddResult(Result(Pattern, Rank));
+
+  // @selector ( selector )
+  Pattern = new CodeCompletionString;
+  Pattern->AddTypedTextChunk("selector");
+  Pattern->AddChunk(CodeCompletionString::CK_LeftParen);
+  Pattern->AddPlaceholderChunk("selector");
+  Pattern->AddChunk(CodeCompletionString::CK_RightParen);
+  Results.MaybeAddResult(Result(Pattern, Rank));
+}
+
+void Sema::CodeCompleteObjCAtStatement(Scope *S) {
+  typedef CodeCompleteConsumer::Result Result;
+  ResultBuilder Results(*this);
+  Results.EnterNewScope();
+
+  CodeCompletionString *Pattern = 0;
+
+  // @try { statements } @catch ( declaration ) { statements } @finally
+  //   { statements }
+  Pattern = new CodeCompletionString;
+  Pattern->AddTypedTextChunk("try");
+  Pattern->AddChunk(CodeCompletionString::CK_LeftBrace);
+  Pattern->AddPlaceholderChunk("statements");
+  Pattern->AddChunk(CodeCompletionString::CK_RightBrace);
+  Pattern->AddTextChunk("@catch");
+  Pattern->AddChunk(CodeCompletionString::CK_LeftParen);
+  Pattern->AddPlaceholderChunk("parameter");
+  Pattern->AddChunk(CodeCompletionString::CK_RightParen);
+  Pattern->AddChunk(CodeCompletionString::CK_LeftBrace);
+  Pattern->AddPlaceholderChunk("statements");
+  Pattern->AddChunk(CodeCompletionString::CK_RightBrace);
+  Pattern->AddTextChunk("@finally");
+  Pattern->AddChunk(CodeCompletionString::CK_LeftBrace);
+  Pattern->AddPlaceholderChunk("statements");
+  Pattern->AddChunk(CodeCompletionString::CK_RightBrace);
+  Results.MaybeAddResult(Result(Pattern, 0));
+
+  // @throw
+  Pattern = new CodeCompletionString;
+  Pattern->AddTypedTextChunk("throw");
+  Pattern->AddTextChunk(" ");
+  Pattern->AddPlaceholderChunk("expression");
+  Pattern->AddTextChunk(";");
+  Results.MaybeAddResult(Result(Pattern, 0)); // FIXME: add ';' chunk
+
+  // @synchronized ( expression ) { statements }
+  Pattern = new CodeCompletionString;
+  Pattern->AddTypedTextChunk("synchronized");
+  Pattern->AddTextChunk(" ");
+  Pattern->AddChunk(CodeCompletionString::CK_LeftParen);
+  Pattern->AddPlaceholderChunk("expression");
+  Pattern->AddChunk(CodeCompletionString::CK_RightParen);
+  Pattern->AddChunk(CodeCompletionString::CK_LeftBrace);
+  Pattern->AddPlaceholderChunk("statements");
+  Pattern->AddChunk(CodeCompletionString::CK_RightBrace);
+  Results.MaybeAddResult(Result(Pattern, 0)); // FIXME: add ';' chunk
+
+  AddObjCExpressionResults(0, Results);
+  Results.ExitScope();
+  HandleCodeCompleteResults(this, CodeCompleter, Results.data(),Results.size());
+}
+
+void Sema::CodeCompleteObjCAtExpression(Scope *S) {
+  ResultBuilder Results(*this);
+  Results.EnterNewScope();
+  AddObjCExpressionResults(0, Results);
+  Results.ExitScope();
+  HandleCodeCompleteResults(this, CodeCompleter, Results.data(),Results.size());
+}
+
 /// \brief Determine whether the addition of the given flag to an Objective-C
 /// property's attributes will cause a conflict.
 static bool ObjCPropertyFlagConflicts(unsigned Attributes, unsigned NewFlag) {
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 520d7de..14d2377 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "Sema.h"
+#include "SemaInit.h"
 #include "Lookup.h"
 #include "clang/AST/APValue.h"
 #include "clang/AST/ASTConsumer.h"
@@ -229,7 +230,7 @@ DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) {
   LookupName(R, S, false);
   R.suppressDiagnostics();
   if (R.getResultKind() == LookupResult::Found)
-    if (const TagDecl *TD = dyn_cast<TagDecl>(R.getAsSingleDecl(Context))) {
+    if (const TagDecl *TD = R.getAsSingle<TagDecl>()) {
       switch (TD->getTagKind()) {
       case TagDecl::TK_struct: return DeclSpec::TST_struct;
       case TagDecl::TK_union:  return DeclSpec::TST_union;
@@ -379,7 +380,9 @@ void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) {
   // scope.
   if ((isa<FunctionTemplateDecl>(D) &&
        cast<FunctionTemplateDecl>(D)->getTemplatedDecl()->isOutOfLine()) ||
-      (isa<FunctionDecl>(D) && cast<FunctionDecl>(D)->isOutOfLine()) ||
+      (isa<FunctionDecl>(D) &&
+       (cast<FunctionDecl>(D)->isFunctionTemplateSpecialization() ||
+        cast<FunctionDecl>(D)->isOutOfLine())) ||
       (isa<VarDecl>(D) && cast<VarDecl>(D)->isOutOfLine()))
     return;
 
@@ -588,7 +591,7 @@ NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid,
 
   FunctionDecl *New = FunctionDecl::Create(Context,
                                            Context.getTranslationUnitDecl(),
-                                           Loc, II, R, /*DInfo=*/0,
+                                           Loc, II, R, /*TInfo=*/0,
                                            FunctionDecl::Extern, false,
                                            /*hasPrototype=*/true);
   New->setImplicit();
@@ -599,7 +602,7 @@ NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid,
     llvm::SmallVector<ParmVarDecl*, 16> Params;
     for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i)
       Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0,
-                                           FT->getArgType(i), /*DInfo=*/0,
+                                           FT->getArgType(i), /*TInfo=*/0,
                                            VarDecl::None, 0));
     New->setParams(Context, Params.data(), Params.size());
   }
@@ -762,6 +765,24 @@ struct GNUCompatibleParamWarning {
   QualType PromotedType;
 };
 
+
+/// getSpecialMember - get the special member enum for a method.
+static Sema::CXXSpecialMember getSpecialMember(ASTContext &Ctx,
+                                               const CXXMethodDecl *MD) {
+  if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) {
+    if (Ctor->isDefaultConstructor())
+      return Sema::CXXDefaultConstructor;
+    if (Ctor->isCopyConstructor(Ctx))
+      return Sema::CXXCopyConstructor;
+  } 
+  
+  if (isa<CXXDestructorDecl>(MD))
+    return Sema::CXXDestructor;
+  
+  assert(MD->isCopyAssignment() && "Must have copy assignment operator");
+  return Sema::CXXCopyAssignment;
+}
+
 /// MergeFunctionDecl - We just parsed a function 'New' from
 /// declarator D which has the same name and scope as a previous
 /// declaration 'Old'.  Figure out how to resolve this situation,
@@ -782,6 +803,15 @@ bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) {
   else
     Old = dyn_cast<FunctionDecl>(OldD);
   if (!Old) {
+    if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) {
+      Diag(New->getLocation(), diag::err_using_decl_conflict_reverse);
+      Diag(Shadow->getTargetDecl()->getLocation(),
+           diag::note_using_decl_target);
+      Diag(Shadow->getUsingDecl()->getLocation(),
+           diag::note_using_decl) << 0;
+      return true;
+    }
+
     Diag(New->getLocation(), diag::err_redefinition_different_kind)
       << New->getDeclName();
     Diag(OldD->getLocation(), diag::note_previous_definition);
@@ -827,33 +857,45 @@ bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) {
 
     const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old);
     const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New);
-    if (OldMethod && NewMethod && !NewMethod->getFriendObjectKind() &&
-        NewMethod->getLexicalDeclContext()->isRecord()) {
-      //    -- Member function declarations with the same name and the
-      //       same parameter types cannot be overloaded if any of them
-      //       is a static member function declaration.
-      if (OldMethod->isStatic() || NewMethod->isStatic()) {
-        Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member);
+    if (OldMethod && NewMethod) {
+      if (!NewMethod->getFriendObjectKind() &&
+          NewMethod->getLexicalDeclContext()->isRecord()) {
+        //    -- Member function declarations with the same name and the
+        //       same parameter types cannot be overloaded if any of them
+        //       is a static member function declaration.
+        if (OldMethod->isStatic() || NewMethod->isStatic()) {
+          Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member);
+          Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
+          return true;
+        }
+      
+        // C++ [class.mem]p1:
+        //   [...] A member shall not be declared twice in the
+        //   member-specification, except that a nested class or member
+        //   class template can be declared and then later defined.
+        unsigned NewDiag;
+        if (isa<CXXConstructorDecl>(OldMethod))
+          NewDiag = diag::err_constructor_redeclared;
+        else if (isa<CXXDestructorDecl>(NewMethod))
+          NewDiag = diag::err_destructor_redeclared;
+        else if (isa<CXXConversionDecl>(NewMethod))
+          NewDiag = diag::err_conv_function_redeclared;
+        else
+          NewDiag = diag::err_member_redeclared;
+
+        Diag(New->getLocation(), NewDiag);
         Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
-        return true;
+      } else {
+        if (OldMethod->isImplicit()) {
+          Diag(NewMethod->getLocation(),
+               diag::err_definition_of_implicitly_declared_member) 
+          << New << getSpecialMember(Context, OldMethod);
+        
+          Diag(OldMethod->getLocation(),
+               diag::note_previous_implicit_declaration);
+          return true;
+        }
       }
-
-      // C++ [class.mem]p1:
-      //   [...] A member shall not be declared twice in the
-      //   member-specification, except that a nested class or member
-      //   class template can be declared and then later defined.
-      unsigned NewDiag;
-      if (isa<CXXConstructorDecl>(OldMethod))
-        NewDiag = diag::err_constructor_redeclared;
-      else if (isa<CXXDestructorDecl>(NewMethod))
-        NewDiag = diag::err_destructor_redeclared;
-      else if (isa<CXXConversionDecl>(NewMethod))
-        NewDiag = diag::err_conv_function_redeclared;
-      else
-        NewDiag = diag::err_member_redeclared;
-
-      Diag(New->getLocation(), NewDiag);
-      Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
     }
 
     // (C++98 8.3.5p3):
@@ -894,7 +936,7 @@ bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) {
            ParamType != ParamEnd; ++ParamType) {
         ParmVarDecl *Param = ParmVarDecl::Create(Context, New,
                                                  SourceLocation(), 0,
-                                                 *ParamType, /*DInfo=*/0,
+                                                 *ParamType, /*TInfo=*/0,
                                                  VarDecl::None, 0);
         Param->setImplicit();
         Params.push_back(Param);
@@ -1057,10 +1099,11 @@ void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) {
   if (getLangOptions().CPlusPlus) {
     if (Context.hasSameType(New->getType(), Old->getType()))
       MergedT = New->getType();
-    // C++ [basic.types]p7:
-    //   [...] The declared type of an array object might be an array of
-    //   unknown size and therefore be incomplete at one point in a
-    //   translation unit and complete later on; [...]
+    // C++ [basic.link]p10:
+    //   [...] the types specified by all declarations referring to a given
+    //   object or function shall be identical, except that declarations for an
+    //   array object can specify array types that differ by the presence or
+    //   absence of a major array bound (8.3.4).
     else if (Old->getType()->isIncompleteArrayType() &&
              New->getType()->isArrayType()) {
       CanQual<ArrayType> OldArray
@@ -1069,6 +1112,14 @@ void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) {
         = Context.getCanonicalType(New->getType())->getAs<ArrayType>();
       if (OldArray->getElementType() == NewArray->getElementType())
         MergedT = New->getType();
+    } else if (Old->getType()->isArrayType() &&
+             New->getType()->isIncompleteArrayType()) {
+      CanQual<ArrayType> OldArray
+        = Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
+      CanQual<ArrayType> NewArray
+        = Context.getCanonicalType(New->getType())->getAs<ArrayType>();
+      if (OldArray->getElementType() == NewArray->getElementType())
+        MergedT = Old->getType();
     }
   } else {
     MergedT = Context.mergeTypes(New->getType(), Old->getType());
@@ -1202,6 +1253,11 @@ Sema::ControlFlowKind Sema::CheckFallThrough(Stmt *Root) {
       HasFakeEdge = true;
       continue;
     }
+    if (isa<AsmStmt>(S)) {
+      HasFakeEdge = true;
+      HasLiveReturn = true;
+      continue;
+    }
     bool NoReturnEdge = false;
     if (CallExpr *C = dyn_cast<CallExpr>(S)) {
       Expr *CEE = C->getCallee()->IgnoreParenCasts();
@@ -1209,11 +1265,10 @@ Sema::ControlFlowKind Sema::CheckFallThrough(Stmt *Root) {
         NoReturnEdge = true;
         HasFakeEdge = true;
       } else if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) {
-        if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DRE->getDecl())) {
-          if (FD->hasAttr<NoReturnAttr>()) {
-            NoReturnEdge = true;
-            HasFakeEdge = true;
-          }
+        ValueDecl *VD = DRE->getDecl();
+        if (VD->hasAttr<NoReturnAttr>()) {
+          NoReturnEdge = true;
+          HasFakeEdge = true;
         }
       }
     }
@@ -1648,9 +1703,9 @@ Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
 
   // Mock up a declarator.
   Declarator Dc(DS, Declarator::TypeNameContext);
-  DeclaratorInfo *DInfo = 0;
-  GetTypeForDeclarator(Dc, S, &DInfo);
-  assert(DInfo && "couldn't build declarator info for anonymous struct/union");
+  TypeSourceInfo *TInfo = 0;
+  GetTypeForDeclarator(Dc, S, &TInfo);
+  assert(TInfo && "couldn't build declarator info for anonymous struct/union");
 
   // Create a declaration for this anonymous struct/union.
   NamedDecl *Anon = 0;
@@ -1658,7 +1713,7 @@ Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
     Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(),
                              /*IdentifierInfo=*/0,
                              Context.getTypeDeclType(Record),
-                             DInfo,
+                             TInfo,
                              /*BitWidth=*/0, /*Mutable=*/false);
     Anon->setAccess(AS_public);
     if (getLangOptions().CPlusPlus)
@@ -1685,7 +1740,7 @@ Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
     Anon = VarDecl::Create(Context, Owner, Record->getLocation(),
                            /*IdentifierInfo=*/0,
                            Context.getTypeDeclType(Record),
-                           DInfo,
+                           TInfo,
                            SC);
   }
   Anon->setImplicit();
@@ -1765,13 +1820,8 @@ DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) {
       
     case UnqualifiedId::IK_TemplateId: {
       TemplateName TName
-        = TemplateName::getFromVoidPointer(Name.TemplateId->Template);    
-      if (TemplateDecl *Template = TName.getAsTemplateDecl())
-        return Template->getDeclName();
-      if (OverloadedFunctionDecl *Ovl = TName.getAsOverloadedFunctionDecl())
-        return Ovl->getDeclName();
-      
-      return DeclarationName();
+        = TemplateName::getFromVoidPointer(Name.TemplateId->Template);
+      return Context.getNameForTemplate(TName);
     }
   }
   
@@ -1851,8 +1901,8 @@ Sema::HandleDeclarator(Scope *S, Declarator &D,
   DeclContext *DC;
   NamedDecl *New;
 
-  DeclaratorInfo *DInfo = 0;
-  QualType R = GetTypeForDeclarator(D, S, &DInfo);
+  TypeSourceInfo *TInfo = 0;
+  QualType R = GetTypeForDeclarator(D, S, &TInfo);
 
   LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName,
                         ForRedeclaration);
@@ -1982,13 +2032,13 @@ Sema::HandleDeclarator(Scope *S, Declarator &D,
       return DeclPtrTy();
     }
 
-    New = ActOnTypedefDeclarator(S, D, DC, R, DInfo, Previous, Redeclaration);
+    New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration);
   } else if (R->isFunctionType()) {
-    New = ActOnFunctionDeclarator(S, D, DC, R, DInfo, Previous,
+    New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous,
                                   move(TemplateParamLists),
                                   IsFunctionDefinition, Redeclaration);
   } else {
-    New = ActOnVariableDeclarator(S, D, DC, R, DInfo, Previous,
+    New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous,
                                   move(TemplateParamLists),
                                   Redeclaration);
   }
@@ -1998,9 +2048,7 @@ Sema::HandleDeclarator(Scope *S, Declarator &D,
 
   // If this has an identifier and is not an invalid redeclaration or 
   // function template specialization, add it to the scope stack.
-  if (Name && !(Redeclaration && New->isInvalidDecl()) &&
-      !(isa<FunctionDecl>(New) && 
-        cast<FunctionDecl>(New)->isFunctionTemplateSpecialization()))
+  if (Name && !(Redeclaration && New->isInvalidDecl()))
     PushOnScopeChains(New, S);
 
   return DeclPtrTy::make(New);
@@ -2104,7 +2152,7 @@ void Sema::DiagnoseFunctionSpecifiers(Declarator& D) {
 
 NamedDecl*
 Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
-                             QualType R,  DeclaratorInfo *DInfo,
+                             QualType R,  TypeSourceInfo *TInfo,
                              LookupResult &Previous, bool &Redeclaration) {
   // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1).
   if (D.getCXXScopeSpec().isSet()) {
@@ -2125,7 +2173,7 @@ Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
   if (D.getDeclSpec().isThreadSpecified())
     Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
 
-  TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, DInfo);
+  TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo);
   if (!NewTD) return 0;
 
   // Handle attributes prior to checking for duplicates in MergeVarDecl
@@ -2151,7 +2199,7 @@ Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
           TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative);
       if (!FixedTy.isNull()) {
         Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size);
-        NewTD->setTypeDeclaratorInfo(Context.getTrivialDeclaratorInfo(FixedTy));
+        NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy));
       } else {
         if (SizeIsNegative)
           Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size);
@@ -2244,7 +2292,7 @@ isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC,
 
 NamedDecl*
 Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC,
-                              QualType R, DeclaratorInfo *DInfo,
+                              QualType R, TypeSourceInfo *TInfo,
                               LookupResult &Previous,
                               MultiTemplateParamsArg TemplateParamLists,
                               bool &Redeclaration) {
@@ -2302,7 +2350,7 @@ Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC,
       Diag(D.getDeclSpec().getStorageClassSpecLoc(),
            diag::err_static_out_of_line)
         << CodeModificationHint::CreateRemoval(
-                       SourceRange(D.getDeclSpec().getStorageClassSpecLoc()));
+                                      D.getDeclSpec().getStorageClassSpecLoc());
     } else if (SC == VarDecl::None)
       SC = VarDecl::Static;
   }
@@ -2346,7 +2394,7 @@ Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC,
   }
 
   NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(),
-                          II, R, DInfo, SC);
+                          II, R, TInfo, SC);
 
   if (D.isInvalidType())
     NewVD->setInvalidDecl();
@@ -2449,12 +2497,6 @@ void Sema::CheckVariableDeclaration(VarDecl *NewVD,
     return NewVD->setInvalidDecl();
   }
 
-  // The variable can not have an abstract class type.
-  if (RequireNonAbstractType(NewVD->getLocation(), T,
-                             diag::err_abstract_type_in_decl,
-                             AbstractVariableType))
-    return NewVD->setInvalidDecl();
-
   // Emit an error if an address space was applied to decl with local storage.
   // This includes arrays of objects with address space qualifiers, but not
   // automatic variables that point to other address spaces.
@@ -2596,7 +2638,7 @@ void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
         if (!CheckOverridingFunctionReturnType(MD, OldMD) &&
             !CheckOverridingFunctionExceptionSpec(MD, OldMD) &&
             !CheckOverridingFunctionAttributes(MD, OldMD))
-          MD->addOverriddenMethod(OldMD);
+          MD->addOverriddenMethod(OldMD->getCanonicalDecl());
       }
     }
   }
@@ -2604,7 +2646,7 @@ void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
 
 NamedDecl*
 Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
-                              QualType R, DeclaratorInfo *DInfo,
+                              QualType R, TypeSourceInfo *TInfo,
                               LookupResult &Previous,
                               MultiTemplateParamsArg TemplateParamLists,
                               bool IsFunctionDefinition, bool &Redeclaration) {
@@ -2686,7 +2728,7 @@ Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
     // Create the new declaration
     NewFD = CXXConstructorDecl::Create(Context,
                                        cast<CXXRecordDecl>(DC),
-                                       D.getIdentifierLoc(), Name, R, DInfo,
+                                       D.getIdentifierLoc(), Name, R, TInfo,
                                        isExplicit, isInline,
                                        /*isImplicitlyDeclared=*/false);
   } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
@@ -2707,7 +2749,7 @@ Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
       // Create a FunctionDecl to satisfy the function definition parsing
       // code path.
       NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(),
-                                   Name, R, DInfo, SC, isInline,
+                                   Name, R, TInfo, SC, isInline,
                                    /*hasPrototype=*/true);
       D.setInvalidType();
     }
@@ -2720,7 +2762,7 @@ Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
 
     CheckConversionDeclarator(D, R, SC);
     NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC),
-                                      D.getIdentifierLoc(), Name, R, DInfo,
+                                      D.getIdentifierLoc(), Name, R, TInfo,
                                       isInline, isExplicit);
 
     isVirtualOkay = true;
@@ -2754,7 +2796,7 @@ Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
     
     // This is a C++ method declaration.
     NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC),
-                                  D.getIdentifierLoc(), Name, R, DInfo,
+                                  D.getIdentifierLoc(), Name, R, TInfo,
                                   isStatic, isInline);
 
     isVirtualOkay = !isStatic;
@@ -2772,7 +2814,7 @@ Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
 
     NewFD = FunctionDecl::Create(Context, DC,
                                  D.getIdentifierLoc(),
-                                 Name, R, DInfo, SC, isInline, HasPrototype);
+                                 Name, R, TInfo, SC, isInline, HasPrototype);
   }
 
   if (D.isInvalidType())
@@ -2830,18 +2872,11 @@ Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
       // 'virtual' was specified outside of the class.
       Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class)
         << CodeModificationHint::CreateRemoval(
-                             SourceRange(D.getDeclSpec().getVirtualSpecLoc()));
+                                           D.getDeclSpec().getVirtualSpecLoc());
     } else {
       // Okay: Add virtual to the method.
-      cast<CXXMethodDecl>(NewFD)->setVirtualAsWritten(true);
       CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC);
-      CurClass->setAggregate(false);
-      CurClass->setPOD(false);
-      CurClass->setEmpty(false);
-      CurClass->setPolymorphic(true);
-      CurClass->setHasTrivialConstructor(false);
-      CurClass->setHasTrivialCopyConstructor(false);
-      CurClass->setHasTrivialCopyAssignment(false);
+      CurClass->setMethodAsVirtual(NewFD);
     }
   }
 
@@ -2865,9 +2900,6 @@ Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
     NewFD->setAccess(AS_public);
   }
 
-  if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD))
-    AddOverriddenMethods(cast<CXXRecordDecl>(DC), NewMD);
-
   if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) &&
       !CurContext->isRecord()) {
     // C++ [class.static]p1:
@@ -2880,7 +2912,7 @@ Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
     Diag(D.getDeclSpec().getStorageClassSpecLoc(),
          diag::err_static_out_of_line)
       << CodeModificationHint::CreateRemoval(
-                      SourceRange(D.getDeclSpec().getStorageClassSpecLoc()));
+                                      D.getDeclSpec().getStorageClassSpecLoc());
   }
 
   // Handle GNU asm-label extension (encoded as an attribute).
@@ -2937,7 +2969,7 @@ Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
          AE = FT->arg_type_end(); AI != AE; ++AI) {
       ParmVarDecl *Param = ParmVarDecl::Create(Context, DC,
                                                SourceLocation(), 0,
-                                               *AI, /*DInfo=*/0,
+                                               *AI, /*TInfo=*/0,
                                                VarDecl::None, 0);
       Param->setImplicit();
       Params.push_back(Param);
@@ -2996,7 +3028,7 @@ Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
     
   // Perform semantic checking on the function declaration.
   bool OverloadableAttrRequired = false; // FIXME: HACK!
-  CheckFunctionDeclaration(NewFD, Previous, isExplicitSpecialization,
+  CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization,
                            Redeclaration, /*FIXME:*/OverloadableAttrRequired);
 
   assert((NewFD->isInvalidDecl() || !Redeclaration ||
@@ -3118,7 +3150,7 @@ Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
 /// an explicit specialization of the previous declaration.
 ///
 /// This sets NewFD->isInvalidDecl() to true if there was an error.
-void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD,
+void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
                                     LookupResult &Previous,
                                     bool IsExplicitSpecialization,
                                     bool &Redeclaration,
@@ -3156,34 +3188,47 @@ void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD,
     // there's no more work to do here; we'll just add the new
     // function to the scope.
 
-    if (!getLangOptions().CPlusPlus &&
-        AllowOverloadingOfFunction(Previous, Context)) {
-      OverloadableAttrRequired = true;
-
-      // Functions marked "overloadable" must have a prototype (that
-      // we can't get through declaration merging).
-      if (!NewFD->getType()->getAs<FunctionProtoType>()) {
-        Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype)
-          << NewFD;
-        Redeclaration = true;
+    NamedDecl *OldDecl = 0;
+    if (!AllowOverloadingOfFunction(Previous, Context)) {
+      Redeclaration = true;
+      OldDecl = Previous.getFoundDecl();
+    } else {
+      if (!getLangOptions().CPlusPlus) {
+        OverloadableAttrRequired = true;
+
+        // Functions marked "overloadable" must have a prototype (that
+        // we can't get through declaration merging).
+        if (!NewFD->getType()->getAs<FunctionProtoType>()) {
+          Diag(NewFD->getLocation(),
+               diag::err_attribute_overloadable_no_prototype)
+            << NewFD;
+          Redeclaration = true;
 
-        // Turn this into a variadic function with no parameters.
-        QualType R = Context.getFunctionType(
-                       NewFD->getType()->getAs<FunctionType>()->getResultType(),
-                       0, 0, true, 0);
-        NewFD->setType(R);
-        return NewFD->setInvalidDecl();
+          // Turn this into a variadic function with no parameters.
+          QualType R = Context.getFunctionType(
+                     NewFD->getType()->getAs<FunctionType>()->getResultType(),
+                     0, 0, true, 0);
+          NewFD->setType(R);
+          return NewFD->setInvalidDecl();
+        }
       }
-    }
 
-    NamedDecl *OldDecl = 0;
-    if (!Previous.empty()) {
-      if (!AllowOverloadingOfFunction(Previous, Context)) {
+      switch (CheckOverload(NewFD, Previous, OldDecl)) {
+      case Ovl_Match:
         Redeclaration = true;
-        OldDecl = Previous.getFoundDecl();
-      } else if (!IsOverload(NewFD, Previous, OldDecl)) {
-        if (!isUsingDecl(OldDecl))
-          Redeclaration = true;
+        if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) {
+          HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl));
+          Redeclaration = false;
+        }
+        break;
+
+      case Ovl_NonFunction:
+        Redeclaration = true;
+        break;
+
+      case Ovl_Overload:
+        Redeclaration = false;
+        break;
       }
     }
 
@@ -3243,8 +3288,6 @@ void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD,
           Diag(NewFD->getLocation(), diag::err_destructor_name);
           return NewFD->setInvalidDecl();
         }
-      
-        CheckDestructor(Destructor);
       }
 
       Record->setUserDeclaredDestructor(true);
@@ -3257,8 +3300,22 @@ void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD,
       // FIXME: C++0x: don't do this for "= default" destructors
       Record->setHasTrivialDestructor(false);
     } else if (CXXConversionDecl *Conversion
-               = dyn_cast<CXXConversionDecl>(NewFD))
+               = dyn_cast<CXXConversionDecl>(NewFD)) {
       ActOnConversionDeclarator(Conversion);
+    }
+
+    // Find any virtual functions that this function overrides.
+    if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) {
+      if (!Method->isFunctionTemplateSpecialization() && 
+          !Method->getDescribedFunctionTemplate())
+        AddOverriddenMethods(Method->getParent(), Method);
+    }
+
+    // Additional checks for the destructor; make sure we do this after we
+    // figure out whether the destructor is virtual.
+    if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD))
+      if (!Destructor->getParent()->isDependentType())
+        CheckDestructor(Destructor);
 
     // Extra checking for C++ overloaded operators (C++ [over.oper]).
     if (NewFD->isOverloadedOperator() &&
@@ -3392,18 +3449,9 @@ void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) {
     IntegerLiteral *IL;
     Expr *Init = static_cast<Expr *>(init.get());
     if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 &&
-        Context.getCanonicalType(IL->getType()) == Context.IntTy) {
-      if (Method->isVirtualAsWritten()) {
-        Method->setPure();
-
-        // A class is abstract if at least one function is pure virtual.
-        cast<CXXRecordDecl>(CurContext)->setAbstract(true);
-      } else if (!Method->isInvalidDecl()) {
-        Diag(Method->getLocation(), diag::err_non_virtual_pure)
-          << Method->getDeclName() << Init->getSourceRange();
-        Method->setInvalidDecl();
-      }
-    } else {
+        Context.getCanonicalType(IL->getType()) == Context.IntTy)
+      CheckPureMethod(Method, Init->getSourceRange());
+    else {
       Diag(Method->getLocation(), diag::err_member_function_initialization)
         << Method->getDeclName() << Init->getSourceRange();
       Method->setInvalidDecl();
@@ -3436,6 +3484,12 @@ void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) {
     return;
   }
 
+  // The variable can not have an abstract class type.
+  if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
+                             diag::err_abstract_type_in_decl,
+                             AbstractVariableType))
+    VDecl->setInvalidDecl();
+
   const VarDecl *Def = 0;
   if (VDecl->getDefinition(Def)) {
     Diag(VDecl->getLocation(), diag::err_redefinition)
@@ -3458,8 +3512,36 @@ void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) {
       Diag(VDecl->getLocation(), diag::err_block_extern_cant_init);
       VDecl->setInvalidDecl();
     } else if (!VDecl->isInvalidDecl()) {
-      if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(),
-                                VDecl->getDeclName(), DirectInit))
+      if (VDecl->getType()->isReferenceType()
+          || isa<InitListExpr>(Init)) {
+        InitializedEntity Entity
+          = InitializedEntity::InitializeVariable(VDecl);
+
+        // FIXME: Poor source location information.
+        InitializationKind Kind
+          = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(),
+                                                         SourceLocation(),
+                                                         SourceLocation())
+                      : InitializationKind::CreateCopy(VDecl->getLocation(),
+                                                       SourceLocation());
+        InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
+        if (InitSeq) {
+          OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind,
+                                           MultiExprArg(*this, (void**)&Init, 1),
+                                                    &DclT);
+          if (Result.isInvalid()) {
+            VDecl->setInvalidDecl();
+            return;
+          }
+
+          Init = Result.takeAs<Expr>();
+        } else {
+          InitSeq.Diagnose(*this, Entity, Kind, &Init, 1);
+          VDecl->setInvalidDecl();
+          return;
+        }    
+      } else if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(),
+                                       VDecl->getDeclName(), DirectInit))
         VDecl->setInvalidDecl();
 
       // C++ 3.6.2p2, allow dynamic initialization of static initializers.
@@ -3649,7 +3731,7 @@ void Sema::ActOnUninitializedDecl(DeclPtrTy dcl,
                                                SourceRange(Var->getLocation(),
                                                            Var->getLocation()),
                                                  Var->getDeclName(),
-                                                 IK_Default,
+                         InitializationKind::CreateDefault(Var->getLocation()),
                                                  ConstructorArgs);
           
           // FIXME: Location info for the variable initialization?
@@ -3668,6 +3750,12 @@ void Sema::ActOnUninitializedDecl(DeclPtrTy dcl,
           Var->setInvalidDecl();
         }
       }
+
+      // The variable can not have an abstract class type.
+      if (RequireNonAbstractType(Var->getLocation(), Type,
+                                 diag::err_abstract_type_in_decl,
+                                 AbstractVariableType))
+        Var->setInvalidDecl();
     }
 
 #if 0
@@ -3817,9 +3905,9 @@ Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
   if (getLangOptions().CPlusPlus)
     CheckExtraCXXDefaultArguments(D);
 
-  DeclaratorInfo *DInfo = 0;
+  TypeSourceInfo *TInfo = 0;
   TagDecl *OwnedDecl = 0;
-  QualType parmDeclType = GetTypeForDeclarator(D, S, &DInfo, &OwnedDecl);
+  QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl);
 
   if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) {
     // C++ [dcl.fct]p6:
@@ -3862,7 +3950,7 @@ Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
 
   ParmVarDecl *New
     = ParmVarDecl::Create(Context, CurContext, D.getIdentifierLoc(), II,
-                          T, DInfo, StorageClass, 0);
+                          T, TInfo, StorageClass, 0);
 
   if (D.isInvalidType())
     New->setInvalidDecl();
@@ -3960,6 +4048,50 @@ Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope,
   return ActOnStartOfFunctionDef(FnBodyScope, DP);
 }
 
+static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) {
+  // Don't warn about invalid declarations.
+  if (FD->isInvalidDecl())
+    return false;
+
+  // Or declarations that aren't global.
+  if (!FD->isGlobal())
+    return false;
+
+  // Don't warn about C++ member functions.
+  if (isa<CXXMethodDecl>(FD))
+    return false;
+
+  // Don't warn about 'main'.
+  if (FD->isMain())
+    return false;
+
+  // Don't warn about inline functions.
+  if (FD->isInlineSpecified())
+    return false;
+
+  // Don't warn about function templates.
+  if (FD->getDescribedFunctionTemplate())
+    return false;
+
+  // Don't warn about function template specializations.
+  if (FD->isFunctionTemplateSpecialization())
+    return false;
+
+  bool MissingPrototype = true;
+  for (const FunctionDecl *Prev = FD->getPreviousDeclaration();
+       Prev; Prev = Prev->getPreviousDeclaration()) {
+    // Ignore any declarations that occur in function or method
+    // scope, because they aren't visible from the header.
+    if (Prev->getDeclContext()->isFunctionOrMethod())
+      continue;
+      
+    MissingPrototype = !Prev->getType()->isFunctionProtoType();
+    break;
+  }
+    
+  return MissingPrototype;
+}
+
 Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) {
   // Clear the last template instantiation error context.
   LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation();
@@ -4005,23 +4137,8 @@ Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) {
   //   prototype declaration. This warning is issued even if the
   //   definition itself provides a prototype. The aim is to detect
   //   global functions that fail to be declared in header files.
-  if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD) &&
-      !FD->isMain()) {
-    bool MissingPrototype = true;
-    for (const FunctionDecl *Prev = FD->getPreviousDeclaration();
-         Prev; Prev = Prev->getPreviousDeclaration()) {
-      // Ignore any declarations that occur in function or method
-      // scope, because they aren't visible from the header.
-      if (Prev->getDeclContext()->isFunctionOrMethod())
-        continue;
-
-      MissingPrototype = !Prev->getType()->isFunctionProtoType();
-      break;
-    }
-
-    if (MissingPrototype)
-      Diag(FD->getLocation(), diag::warn_missing_prototype) << FD;
-  }
+  if (ShouldWarnAboutMissingPrototype(FD))
+    Diag(FD->getLocation(), diag::warn_missing_prototype) << FD;
 
   if (FnBodyScope)
     PushDeclContext(FnBodyScope, FD);
@@ -4090,11 +4207,8 @@ Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg,
     if (!FD->isInvalidDecl())
       DiagnoseUnusedParameters(FD->param_begin(), FD->param_end());
 
-    // C++ [basic.def.odr]p2:
-    //   [...] A virtual member function is used if it is not pure. [...]
     if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD))
-      if (Method->isVirtual() && !Method->isPure())
-        MarkDeclarationReferenced(Method->getLocation(), Method);
+      MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method);
 
     assert(FD == getCurFunctionDecl() && "Function parsing confused");
   } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) {
@@ -4301,20 +4415,20 @@ void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
 }
 
 TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
-                                    DeclaratorInfo *DInfo) {
+                                    TypeSourceInfo *TInfo) {
   assert(D.getIdentifier() && "Wrong callback for declspec without declarator");
   assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
 
-  if (!DInfo) {
+  if (!TInfo) {
     assert(D.isInvalidType() && "no declarator info for valid type");
-    DInfo = Context.getTrivialDeclaratorInfo(T);
+    TInfo = Context.getTrivialTypeSourceInfo(T);
   }
 
   // Scope manipulation handled by caller.
   TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext,
                                            D.getIdentifierLoc(),
                                            D.getIdentifier(),
-                                           DInfo);
+                                           TInfo);
 
   if (const TagType *TT = T->getAs<TagType>()) {
     TagDecl *TD = TT->getDecl();
@@ -4621,8 +4735,7 @@ Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
         Previous.clear();
       }
     }
-  } else if (TUK == TUK_Reference && SS.isEmpty() && Name &&
-             (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) {
+  } else if (TUK == TUK_Reference && SS.isEmpty() && Name) {
     // C++ [basic.scope.pdecl]p5:
     //   -- for an elaborated-type-specifier of the form
     //
@@ -4640,6 +4753,11 @@ Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
     // C99 6.7.2.3p8 has a similar (but not identical!) provision for
     // C structs and unions.
     //
+    // It is an error in C++ to declare (rather than define) an enum
+    // type, including via an elaborated type specifier.  We'll
+    // diagnose that later; for now, declare the enum in the same
+    // scope as we would have picked for any other tag type.
+    //
     // GNU C also supports this behavior as part of its incomplete
     // enum types extension, while GNU C++ does not.
     //
@@ -4739,10 +4857,7 @@ CreateNewDecl:
     LookupResult Lookup(*this, Name, NameLoc, LookupOrdinaryName,
                         ForRedeclaration);
     LookupName(Lookup, S);
-    TypedefDecl *PrevTypedef = 0;
-    if (NamedDecl *Prev = Lookup.getAsSingleDecl(Context))
-      PrevTypedef = dyn_cast<TypedefDecl>(Prev);
-
+    TypedefDecl *PrevTypedef = Lookup.getAsSingle<TypedefDecl>();
     NamedDecl *PrevTypedefNamed = PrevTypedef;
     if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) &&
         Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) !=
@@ -4947,8 +5062,8 @@ FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
   SourceLocation Loc = DeclStart;
   if (II) Loc = D.getIdentifierLoc();
 
-  DeclaratorInfo *DInfo = 0;
-  QualType T = GetTypeForDeclarator(D, S, &DInfo);
+  TypeSourceInfo *TInfo = 0;
+  QualType T = GetTypeForDeclarator(D, S, &TInfo);
   if (getLangOptions().CPlusPlus)
     CheckExtraCXXDefaultArguments(D);
 
@@ -4974,7 +5089,7 @@ FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
     = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable);
   SourceLocation TSSL = D.getSourceRange().getBegin();
   FieldDecl *NewFD
-    = CheckFieldDecl(II, T, DInfo, Record, Loc, Mutable, BitWidth, TSSL,
+    = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL,
                      AS, PrevDecl, &D);
   if (NewFD->isInvalidDecl() && PrevDecl) {
     // Don't introduce NewFD into scope; there's already something
@@ -4998,7 +5113,7 @@ FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
 ///
 /// \todo The Declarator argument is a hack. It will be removed once
 FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
-                                DeclaratorInfo *DInfo,
+                                TypeSourceInfo *TInfo,
                                 RecordDecl *Record, SourceLocation Loc,
                                 bool Mutable, Expr *BitWidth,
                                 SourceLocation TSSL,
@@ -5015,9 +5130,14 @@ FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
     T = Context.IntTy;
   }
 
+  QualType EltTy = Context.getBaseElementType(T);
+  if (!EltTy->isDependentType() &&
+      RequireCompleteType(Loc, EltTy, diag::err_field_incomplete))
+    InvalidDecl = true;
+
   // C99 6.7.2.1p8: A member of a structure or union may have any type other
   // than a variably modified type.
-  if (T->isVariablyModifiedType()) {
+  if (!InvalidDecl && T->isVariablyModifiedType()) {
     bool SizeIsNegative;
     QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context,
                                                            SizeIsNegative);
@@ -5034,20 +5154,22 @@ FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
   }
 
   // Fields can not have abstract class types
-  if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl,
-                             AbstractFieldType))
+  if (!InvalidDecl && RequireNonAbstractType(Loc, T,
+                                             diag::err_abstract_type_in_decl,
+                                             AbstractFieldType))
     InvalidDecl = true;
 
   bool ZeroWidth = false;
   // If this is declared as a bit-field, check the bit-field.
-  if (BitWidth && VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) {
+  if (!InvalidDecl && BitWidth &&
+      VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) {
     InvalidDecl = true;
     DeleteExpr(BitWidth);
     BitWidth = 0;
     ZeroWidth = false;
   }
 
-  FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, DInfo,
+  FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo,
                                        BitWidth, Mutable);
   if (InvalidDecl)
     NewFD->setInvalidDecl();
@@ -5059,8 +5181,6 @@ FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
   }
 
   if (getLangOptions().CPlusPlus) {
-    QualType EltTy = Context.getBaseElementType(T);
-
     CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record);
 
     if (!T->isPODType())
@@ -5296,8 +5416,8 @@ Sema::DeclPtrTy Sema::ActOnIvar(Scope *S,
   // FIXME: Unnamed fields can be handled in various different ways, for
   // example, unnamed unions inject all members into the struct namespace!
 
-  DeclaratorInfo *DInfo = 0;
-  QualType T = GetTypeForDeclarator(D, S, &DInfo);
+  TypeSourceInfo *TInfo = 0;
+  QualType T = GetTypeForDeclarator(D, S, &TInfo);
 
   if (BitWidth) {
     // 6.7.2.1p3, 6.7.2.1p4
@@ -5340,7 +5460,7 @@ Sema::DeclPtrTy Sema::ActOnIvar(Scope *S,
   // Construct the decl.
   ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context,
                                              EnclosingContext, Loc, II, T,
-                                             DInfo, ac, (Expr *)BitfieldWidth);
+                                             TInfo, ac, (Expr *)BitfieldWidth);
 
   if (II) {
     NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName,
@@ -5403,8 +5523,10 @@ void Sema::ActOnFields(Scope* S,
 
     // If the field is already invalid for some reason, don't emit more
     // diagnostics about it.
-    if (FD->isInvalidDecl())
+    if (FD->isInvalidDecl()) {
+      EnclosingDecl->setInvalidDecl();
       continue;
+    }
 
     // C99 6.7.2.1p2:
     //   A structure or union shall not contain a member with
@@ -5540,7 +5662,7 @@ EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
   llvm::APSInt EnumVal(32);
   QualType EltTy;
   if (Val) {
-    if (Val->isTypeDependent())
+    if (Enum->isDependentType())
       EltTy = Context.DependentTy;
     else {
       // Make sure to promote the operand type to int.
@@ -5552,8 +5674,7 @@ EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
 
       // C99 6.7.2.2p2: Make sure we have an integer constant expression.
       SourceLocation ExpLoc;
-      if (!Val->isValueDependent() &&
-          VerifyIntegerConstantExpression(Val, &EnumVal)) {
+      if (VerifyIntegerConstantExpression(Val, &EnumVal)) {
         Val = 0;
       } else {
         EltTy = Val->getType();
@@ -5562,7 +5683,9 @@ EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
   }
 
   if (!Val) {
-    if (LastEnumConst) {
+    if (Enum->isDependentType())
+      EltTy = Context.DependentTy;
+    else if (LastEnumConst) {
       // Assign the last value + 1.
       EnumVal = LastEnumConst->getInitVal();
       ++EnumVal;
@@ -5576,6 +5699,7 @@ EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
       // First value, set to zero.
       EltTy = Context.IntTy;
       EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy)));
+      EnumVal.setIsSigned(true);
     }
   }
 
@@ -5647,6 +5771,19 @@ void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
   if (Attr)
     ProcessDeclAttributeList(S, Enum, Attr);
 
+  if (Enum->isDependentType()) {
+    for (unsigned i = 0; i != NumElements; ++i) {
+      EnumConstantDecl *ECD =
+        cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>());
+      if (!ECD) continue;
+
+      ECD->setType(EnumType);
+    }
+
+    Enum->completeDefinition(Context, Context.DependentTy, Context.DependentTy);
+    return;
+  }
+
   // TODO: If the result value doesn't fit in an int, it must be a long or long
   // long value.  ISO C does not support this, but GCC does as an extension,
   // emit a warning.
@@ -5698,6 +5835,17 @@ void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
   QualType BestType;
   unsigned BestWidth;
 
+  // C++0x N3000 [conv.prom]p3:
+  //   An rvalue of an unscoped enumeration type whose underlying
+  //   type is not fixed can be converted to an rvalue of the first
+  //   of the following types that can represent all the values of
+  //   the enumeration: int, unsigned int, long int, unsigned long
+  //   int, long long int, or unsigned long long int.
+  // C99 6.4.4.3p2:
+  //   An identifier declared as an enumeration constant has type int.
+  // The C99 rule is modified by a gcc extension 
+  QualType BestPromotionType;
+
   bool Packed = Enum->getAttr<PackedAttr>() ? true : false;
 
   if (NumNegativeBits) {
@@ -5705,22 +5853,21 @@ void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
     // int/long/longlong) that fits.
     // If it's packed, check also if it fits a char or a short.
     if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) {
-        BestType = Context.SignedCharTy;
-        BestWidth = CharWidth;
+      BestType = Context.SignedCharTy;
+      BestWidth = CharWidth;
     } else if (Packed && NumNegativeBits <= ShortWidth &&
                NumPositiveBits < ShortWidth) {
-        BestType = Context.ShortTy;
-        BestWidth = ShortWidth;
-    }
-    else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
+      BestType = Context.ShortTy;
+      BestWidth = ShortWidth;
+    } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
       BestType = Context.IntTy;
       BestWidth = IntWidth;
     } else {
       BestWidth = Context.Target.getLongWidth();
 
-      if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth)
+      if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
         BestType = Context.LongTy;
-      else {
+      } else {
         BestWidth = Context.Target.getLongLongWidth();
 
         if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
@@ -5728,31 +5875,46 @@ void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
         BestType = Context.LongLongTy;
       }
     }
+    BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
   } else {
     // If there is no negative value, figure out which of uint, ulong, ulonglong
     // fits.
     // If it's packed, check also if it fits a char or a short.
     if (Packed && NumPositiveBits <= CharWidth) {
-        BestType = Context.UnsignedCharTy;
-        BestWidth = CharWidth;
+      BestType = Context.UnsignedCharTy;
+      BestPromotionType = Context.IntTy;
+      BestWidth = CharWidth;
     } else if (Packed && NumPositiveBits <= ShortWidth) {
-        BestType = Context.UnsignedShortTy;
-        BestWidth = ShortWidth;
-    }
-    else if (NumPositiveBits <= IntWidth) {
+      BestType = Context.UnsignedShortTy;
+      BestPromotionType = Context.IntTy;
+      BestWidth = ShortWidth;
+    } else if (NumPositiveBits <= IntWidth) {
       BestType = Context.UnsignedIntTy;
       BestWidth = IntWidth;
+      BestPromotionType = (NumPositiveBits == BestWidth
+                           ? Context.UnsignedIntTy : Context.IntTy);
     } else if (NumPositiveBits <=
                (BestWidth = Context.Target.getLongWidth())) {
       BestType = Context.UnsignedLongTy;
+      BestPromotionType = (NumPositiveBits == BestWidth
+                           ? Context.UnsignedLongTy : Context.LongTy);
     } else {
       BestWidth = Context.Target.getLongLongWidth();
       assert(NumPositiveBits <= BestWidth &&
              "How could an initializer get larger than ULL?");
       BestType = Context.UnsignedLongLongTy;
+      BestPromotionType = (NumPositiveBits == BestWidth
+                           ? Context.UnsignedLongLongTy : Context.LongLongTy);
     }
   }
 
+  // If we're in C and the promotion type is larger than an int, just
+  // use the underlying type, which is generally the unsigned integer
+  // type of the same rank as the promotion type.  This is how the gcc
+  // extension works.
+  if (!getLangOptions().CPlusPlus && BestPromotionType != Context.IntTy)
+    BestPromotionType = BestType;
+
   // Loop over all of the enumerator constants, changing their types to match
   // the type of the enum if needed.
   for (unsigned i = 0; i != NumElements; ++i) {
@@ -5765,19 +5927,8 @@ void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
     // enumerator value fits in an int, type it as an int, otherwise type it the
     // same as the enumerator decl itself.  This means that in "enum { X = 1U }"
     // that X has type 'int', not 'unsigned'.
-    if (ECD->getType() == Context.IntTy) {
-      // Make sure the init value is signed.
-      llvm::APSInt IV = ECD->getInitVal();
-      IV.setIsSigned(true);
-      ECD->setInitVal(IV);
-
-      if (getLangOptions().CPlusPlus)
-        // C++ [dcl.enum]p4: Following the closing brace of an
-        // enum-specifier, each enumerator has the type of its
-        // enumeration.
-        ECD->setType(EnumType);
-      continue;  // Already int type.
-    }
+    if (!getLangOptions().CPlusPlus && ECD->getType() == Context.IntTy)
+      continue;
 
     // Determine whether the value fits into an int.
     llvm::APSInt InitVal = ECD->getInitVal();
@@ -5792,7 +5943,7 @@ void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
     QualType NewTy;
     unsigned NewWidth;
     bool NewSign;
-    if (FitsInInt) {
+    if (FitsInInt && !getLangOptions().CPlusPlus) {
       NewTy = Context.IntTy;
       NewWidth = IntWidth;
       NewSign = true;
@@ -5830,7 +5981,7 @@ void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
       ECD->setType(NewTy);
   }
 
-  Enum->completeDefinition(Context, BestType);
+  Enum->completeDefinition(Context, BestType, BestPromotionType);
 }
 
 Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc,
diff --git a/lib/Sema/SemaDeclAttr.cpp b/lib/Sema/SemaDeclAttr.cpp
index b2124fe..84ee207 100644
--- a/lib/Sema/SemaDeclAttr.cpp
+++ b/lib/Sema/SemaDeclAttr.cpp
@@ -195,98 +195,13 @@ static void HandleExtVectorTypeAttr(Scope *scope, Decl *d,
   QualType T = S.BuildExtVectorType(curType, S.Owned(sizeExpr), Attr.getLoc());
   if (!T.isNull()) {
     // FIXME: preserve the old source info.
-    tDecl->setTypeDeclaratorInfo(S.Context.getTrivialDeclaratorInfo(T));
+    tDecl->setTypeSourceInfo(S.Context.getTrivialTypeSourceInfo(T));
 
     // Remember this typedef decl, we will need it later for diagnostics.
     S.ExtVectorDecls.push_back(tDecl);
   }
 }
 
-
-/// HandleVectorSizeAttribute - this attribute is only applicable to integral
-/// and float scalars, although arrays, pointers, and function return values are
-/// allowed in conjunction with this construct. Aggregates with this attribute
-/// are invalid, even if they are of the same size as a corresponding scalar.
-/// The raw attribute should contain precisely 1 argument, the vector size for
-/// the variable, measured in bytes. If curType and rawAttr are well formed,
-/// this routine will return a new vector type.
-static void HandleVectorSizeAttr(Decl *D, const AttributeList &Attr, Sema &S) {
-  QualType CurType;
-  if (ValueDecl *VD = dyn_cast<ValueDecl>(D))
-    CurType = VD->getType();
-  else if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D))
-    CurType = TD->getUnderlyingType();
-  else {
-    S.Diag(D->getLocation(), diag::err_attr_wrong_decl)
-      << "vector_size" << SourceRange(Attr.getLoc(), Attr.getLoc());
-    return;
-  }
-
-  // Check the attribute arugments.
-  if (Attr.getNumArgs() != 1) {
-    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
-    return;
-  }
-  Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0));
-  llvm::APSInt vecSize(32);
-  if (!sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) {
-    S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
-      << "vector_size" << sizeExpr->getSourceRange();
-    return;
-  }
-  // navigate to the base type - we need to provide for vector pointers, vector
-  // arrays, and functions returning vectors.
-  if (CurType->isPointerType() || CurType->isArrayType() ||
-      CurType->isFunctionType()) {
-    S.Diag(Attr.getLoc(), diag::err_unsupported_vector_size) << CurType;
-    return;
-    /* FIXME: rebuild the type from the inside out, vectorizing the inner type.
-     do {
-     if (PointerType *PT = dyn_cast<PointerType>(canonType))
-     canonType = PT->getPointeeType().getTypePtr();
-     else if (ArrayType *AT = dyn_cast<ArrayType>(canonType))
-     canonType = AT->getElementType().getTypePtr();
-     else if (FunctionType *FT = dyn_cast<FunctionType>(canonType))
-     canonType = FT->getResultType().getTypePtr();
-     } while (canonType->isPointerType() || canonType->isArrayType() ||
-     canonType->isFunctionType());
-     */
-  }
-  // the base type must be integer or float, and can't already be a vector.
-  if (CurType->isVectorType() ||
-      (!CurType->isIntegerType() && !CurType->isRealFloatingType())) {
-    S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
-    return;
-  }
-  unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
-  // vecSize is specified in bytes - convert to bits.
-  unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8);
-
-  // the vector size needs to be an integral multiple of the type size.
-  if (vectorSize % typeSize) {
-    S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size)
-      << sizeExpr->getSourceRange();
-    return;
-  }
-  if (vectorSize == 0) {
-    S.Diag(Attr.getLoc(), diag::err_attribute_zero_size)
-      << sizeExpr->getSourceRange();
-    return;
-  }
-
-  // Success! Instantiate the vector type, the number of elements is > 0, and
-  // not required to be a power of 2, unlike GCC.
-  CurType = S.Context.getVectorType(CurType, vectorSize/typeSize);
-
-  if (ValueDecl *VD = dyn_cast<ValueDecl>(D))
-    VD->setType(CurType);
-  else {
-    // FIXME: preserve existing source info.
-    DeclaratorInfo *DInfo = S.Context.getTrivialDeclaratorInfo(CurType);
-    cast<TypedefDecl>(D)->setTypeDeclaratorInfo(DInfo);
-  }
-}
-
 static void HandlePackedAttr(Decl *d, const AttributeList &Attr, Sema &S) {
   // check the attribute arguments.
   if (Attr.getNumArgs() > 0) {
@@ -461,7 +376,8 @@ static bool HandleCommonNoReturnAttr(Decl *d, const AttributeList &Attr,
 
   if (!isFunctionOrMethod(d) && !isa<BlockDecl>(d)) {
     ValueDecl *VD = dyn_cast<ValueDecl>(d);
-    if (VD == 0 || !VD->getType()->isBlockPointerType()) {
+    if (VD == 0 || (!VD->getType()->isBlockPointerType()
+                    && !VD->getType()->isFunctionPointerType())) {
       S.Diag(Attr.getLoc(),
              Attr.isCXX0XAttribute() ? diag::err_attribute_wrong_decl_type
                                      : diag::warn_attribute_wrong_decl_type)
@@ -1143,10 +1059,6 @@ static void HandlePureAttr(Decl *d, const AttributeList &Attr, Sema &S) {
 }
 
 static void HandleCleanupAttr(Decl *d, const AttributeList &Attr, Sema &S) {
-  // Match gcc which ignores cleanup attrs when compiling C++.
-  if (S.getLangOptions().CPlusPlus)
-    return;
-
   if (!Attr.getParameterName()) {
     S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
     return;
@@ -1709,7 +1621,7 @@ static void HandleModeAttr(Decl *D, const AttributeList &Attr, Sema &S) {
   // Install the new type.
   if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D)) {
     // FIXME: preserve existing source info.
-    TD->setTypeDeclaratorInfo(S.Context.getTrivialDeclaratorInfo(NewTy));
+    TD->setTypeSourceInfo(S.Context.getTrivialTypeSourceInfo(NewTy));
   } else
     cast<ValueDecl>(D)->setType(NewTy);
 }
@@ -1964,6 +1876,7 @@ static void ProcessDeclAttribute(Scope *scope, Decl *D,
   case AttributeList::AT_IBOutlet:    HandleIBOutletAttr  (D, Attr, S); break;
   case AttributeList::AT_address_space:
   case AttributeList::AT_objc_gc:
+  case AttributeList::AT_vector_size:
     // Ignore these, these are type attributes, handled by
     // ProcessTypeAttributes.
     break;
@@ -2013,7 +1926,6 @@ static void ProcessDeclAttribute(Scope *scope, Decl *D,
   case AttributeList::AT_unavailable: HandleUnavailableAttr (D, Attr, S); break;
   case AttributeList::AT_unused:      HandleUnusedAttr      (D, Attr, S); break;
   case AttributeList::AT_used:        HandleUsedAttr        (D, Attr, S); break;
-  case AttributeList::AT_vector_size: HandleVectorSizeAttr  (D, Attr, S); break;
   case AttributeList::AT_visibility:  HandleVisibilityAttr  (D, Attr, S); break;
   case AttributeList::AT_warn_unused_result: HandleWarnUnusedResult(D,Attr,S);
     break;
@@ -2062,11 +1974,11 @@ NamedDecl * Sema::DeclClonePragmaWeak(NamedDecl *ND, IdentifierInfo *II) {
   if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
     NewD = FunctionDecl::Create(FD->getASTContext(), FD->getDeclContext(),
                                 FD->getLocation(), DeclarationName(II),
-                                FD->getType(), FD->getDeclaratorInfo());
+                                FD->getType(), FD->getTypeSourceInfo());
   } else if (VarDecl *VD = dyn_cast<VarDecl>(ND)) {
     NewD = VarDecl::Create(VD->getASTContext(), VD->getDeclContext(),
                            VD->getLocation(), II,
-                           VD->getType(), VD->getDeclaratorInfo(),
+                           VD->getType(), VD->getTypeSourceInfo(),
                            VD->getStorageClass());
   }
   return NewD;
diff --git a/lib/Sema/SemaDeclCXX.cpp b/lib/Sema/SemaDeclCXX.cpp
index f161cb5..228a716 100644
--- a/lib/Sema/SemaDeclCXX.cpp
+++ b/lib/Sema/SemaDeclCXX.cpp
@@ -12,11 +12,14 @@
 //===----------------------------------------------------------------------===//
 
 #include "Sema.h"
+#include "SemaInit.h"
 #include "Lookup.h"
 #include "clang/AST/ASTConsumer.h"
 #include "clang/AST/ASTContext.h"
+#include "clang/AST/RecordLayout.h"
 #include "clang/AST/CXXInheritance.h"
 #include "clang/AST/DeclVisitor.h"
+#include "clang/AST/TypeLoc.h"
 #include "clang/AST/TypeOrdering.h"
 #include "clang/AST/StmtVisitor.h"
 #include "clang/Parse/DeclSpec.h"
@@ -482,24 +485,47 @@ Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
   assert(BaseDecl && "Base type is not incomplete, but has no definition");
   CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
   assert(CXXBaseDecl && "Base type is not a C++ type");
-  if (!CXXBaseDecl->isEmpty())
-    Class->setEmpty(false);
-  if (CXXBaseDecl->isPolymorphic())
-    Class->setPolymorphic(true);
+
   // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases.
   if (CXXBaseDecl->hasAttr<FinalAttr>()) {
     Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString();
-    Diag(CXXBaseDecl->getLocation(), diag::note_previous_class_decl)
-      << BaseType.getAsString();
+    Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl)
+      << BaseType;
     return 0;
   }
 
+  SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual);
+  
+  // Create the base specifier.
+  // FIXME: Allocate via ASTContext?
+  return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
+                              Class->getTagKind() == RecordDecl::TK_class,
+                              Access, BaseType);
+}
+
+void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class,
+                                          const CXXRecordDecl *BaseClass,
+                                          bool BaseIsVirtual) {
+  // A class with a non-empty base class is not empty.
+  // FIXME: Standard ref?
+  if (!BaseClass->isEmpty())
+    Class->setEmpty(false);
+
+  // C++ [class.virtual]p1:
+  //   A class that [...] inherits a virtual function is called a polymorphic
+  //   class.
+  if (BaseClass->isPolymorphic())
+    Class->setPolymorphic(true);
+
   // C++ [dcl.init.aggr]p1:
   //   An aggregate is [...] a class with [...] no base classes [...].
   Class->setAggregate(false);
+
+  // C++ [class]p4:
+  //   A POD-struct is an aggregate class...
   Class->setPOD(false);
 
-  if (Virtual) {
+  if (BaseIsVirtual) {
     // C++ [class.ctor]p5:
     //   A constructor is trivial if its class has no virtual base classes.
     Class->setHasTrivialConstructor(false);
@@ -521,33 +547,27 @@ Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
     // C++ [class.ctor]p5:
     //   A constructor is trivial if all the direct base classes of its
     //   class have trivial constructors.
-    if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor())
+    if (!BaseClass->hasTrivialConstructor())
       Class->setHasTrivialConstructor(false);
 
     // C++ [class.copy]p6:
     //   A copy constructor is trivial if all the direct base classes of its
     //   class have trivial copy constructors.
-    if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor())
+    if (!BaseClass->hasTrivialCopyConstructor())
       Class->setHasTrivialCopyConstructor(false);
 
     // C++ [class.copy]p11:
     //   A copy assignment operator is trivial if all the direct base classes
     //   of its class have trivial copy assignment operators.
-    if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment())
+    if (!BaseClass->hasTrivialCopyAssignment())
       Class->setHasTrivialCopyAssignment(false);
   }
 
   // C++ [class.ctor]p3:
   //   A destructor is trivial if all the direct base classes of its class
   //   have trivial destructors.
-  if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor())
+  if (!BaseClass->hasTrivialDestructor())
     Class->setHasTrivialDestructor(false);
-
-  // Create the base specifier.
-  // FIXME: Allocate via ASTContext?
-  return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
-                              Class->getTagKind() == RecordDecl::TK_class,
-                              Access, BaseType);
 }
 
 /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
@@ -976,19 +996,26 @@ Sema::ActOnMemInitializer(DeclPtrTy ConstructorD,
 
     if (Member)
       return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc,
-                                    RParenLoc);
+                                    LParenLoc, RParenLoc);
   }
   // It didn't name a member, so see if it names a class.
-  TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy
-                     : getTypeName(*MemberOrBase, IdLoc, S, &SS);
-  if (!BaseTy)
+  QualType BaseType;
+
+  TypeSourceInfo *TInfo = 0;
+  if (TemplateTypeTy)
+    BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo);
+  else
+    BaseType = QualType::getFromOpaquePtr(getTypeName(*MemberOrBase, IdLoc, 
+                                                      S, &SS));
+  if (BaseType.isNull())
     return Diag(IdLoc, diag::err_mem_init_not_member_or_class)
       << MemberOrBase << SourceRange(IdLoc, RParenLoc);
 
-  QualType BaseType = GetTypeFromParser(BaseTy);
+  if (!TInfo)
+    TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc);
 
-  return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc,
-                              RParenLoc, ClassDecl);
+  return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 
+                              LParenLoc, RParenLoc, ClassDecl);
 }
 
 /// Checks an initializer expression for use of uninitialized fields, such as
@@ -1037,6 +1064,7 @@ static bool InitExprContainsUninitializedFields(const Stmt* S,
 Sema::MemInitResult
 Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args,
                              unsigned NumArgs, SourceLocation IdLoc,
+                             SourceLocation LParenLoc,
                              SourceLocation RParenLoc) {
   // FIXME: CXXBaseOrMemberInitializer should only contain a single 
   // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary.
@@ -1081,7 +1109,8 @@ Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args,
                                                           NumArgs), 
                                              IdLoc,
                                              SourceRange(IdLoc, RParenLoc), 
-                                             Member->getDeclName(), IK_Direct,
+                                             Member->getDeclName(), 
+                  InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc),
                                              ConstructorArgs);
       
       if (C) {
@@ -1118,22 +1147,25 @@ Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args,
   ExprTemporaries.clear();
   
   // FIXME: Perform direct initialization of the member.
-  return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args,
-                                                  NumArgs, C, IdLoc, RParenLoc);
+  return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc,
+                                                  C, LParenLoc, (Expr **)Args,
+                                                  NumArgs, RParenLoc);
 }
 
 Sema::MemInitResult
-Sema::BuildBaseInitializer(QualType BaseType, Expr **Args,
-                           unsigned NumArgs, SourceLocation IdLoc,
-                           SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) {
+Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo,
+                           Expr **Args, unsigned NumArgs, 
+                           SourceLocation LParenLoc, SourceLocation RParenLoc, 
+                           CXXRecordDecl *ClassDecl) {
   bool HasDependentArg = false;
   for (unsigned i = 0; i < NumArgs; i++)
     HasDependentArg |= Args[i]->isTypeDependent();
 
+  SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin();
   if (!BaseType->isDependentType()) {
     if (!BaseType->isRecordType())
-      return Diag(IdLoc, diag::err_base_init_does_not_name_class)
-        << BaseType << SourceRange(IdLoc, RParenLoc);
+      return Diag(BaseLoc, diag::err_base_init_does_not_name_class)
+        << BaseType << BaseTInfo->getTypeLoc().getSourceRange();
 
     // C++ [class.base.init]p2:
     //   [...] Unless the mem-initializer-id names a nonstatic data
@@ -1179,16 +1211,16 @@ Sema::BuildBaseInitializer(QualType BaseType, Expr **Args,
     //   a direct non-virtual base class and an inherited virtual base
     //   class, the mem-initializer is ill-formed.
     if (DirectBaseSpec && VirtualBaseSpec)
-      return Diag(IdLoc, diag::err_base_init_direct_and_virtual)
-        << BaseType << SourceRange(IdLoc, RParenLoc);
+      return Diag(BaseLoc, diag::err_base_init_direct_and_virtual)
+        << BaseType << BaseTInfo->getTypeLoc().getSourceRange();
     // C++ [base.class.init]p2:
     // Unless the mem-initializer-id names a nonstatic data membeer of the
     // constructor's class ot a direst or virtual base of that class, the
     // mem-initializer is ill-formed.
     if (!DirectBaseSpec && !VirtualBaseSpec)
-      return Diag(IdLoc, diag::err_not_direct_base_or_virtual)
-      << BaseType << ClassDecl->getNameAsCString()
-      << SourceRange(IdLoc, RParenLoc);
+      return Diag(BaseLoc, diag::err_not_direct_base_or_virtual)
+        << BaseType << ClassDecl->getNameAsCString()
+        << BaseTInfo->getTypeLoc().getSourceRange();
   }
 
   CXXConstructorDecl *C = 0;
@@ -1200,8 +1232,10 @@ Sema::BuildBaseInitializer(QualType BaseType, Expr **Args,
     C = PerformInitializationByConstructor(BaseType, 
                                            MultiExprArg(*this, 
                                                         (void**)Args, NumArgs),
-                                           IdLoc, SourceRange(IdLoc, RParenLoc),
-                                           Name, IK_Direct,
+                                           BaseLoc, 
+                                           SourceRange(BaseLoc, RParenLoc),
+                                           Name, 
+                InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc),
                                            ConstructorArgs);
     if (C) {
       // Take over the constructor arguments as our own.
@@ -1214,8 +1248,9 @@ Sema::BuildBaseInitializer(QualType BaseType, Expr **Args,
   // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary.
   ExprTemporaries.clear();
   
-  return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args,
-                                                  NumArgs, C, IdLoc, RParenLoc);
+  return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, C, 
+                                                  LParenLoc, (Expr **)Args, 
+                                                  NumArgs, RParenLoc);
 }
 
 bool
@@ -1277,14 +1312,14 @@ Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor,
       }
       else {
         CXXRecordDecl *VBaseDecl =
-        cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl());
+          cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl());
         assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null");
         CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context);
         if (!Ctor) {
           Diag(Constructor->getLocation(), diag::err_missing_default_ctor)
             << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
             << 0 << VBase->getType();
-          Diag(VBaseDecl->getLocation(), diag::note_previous_class_decl)
+          Diag(VBaseDecl->getLocation(), diag::note_previous_decl)
             << Context.getTagDeclType(VBaseDecl);
           HadError = true;
           continue;
@@ -1298,13 +1333,18 @@ Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor,
         MarkDeclarationReferenced(Constructor->getLocation(), Ctor);
         
         // FIXME: CXXBaseOrMemberInitializer should only contain a single 
-        // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary.
+        // subexpression so we can wrap it in a CXXExprWithTemporaries if 
+        // necessary.
+        // FIXME: Is there any better source-location information we can give?
         ExprTemporaries.clear();
         CXXBaseOrMemberInitializer *Member =
-          new (Context) CXXBaseOrMemberInitializer(VBase->getType(),
-                                                   CtorArgs.takeAs<Expr>(),
-                                                   CtorArgs.size(), Ctor,
+          new (Context) CXXBaseOrMemberInitializer(Context,
+                             Context.getTrivialTypeSourceInfo(VBase->getType(), 
+                                                              SourceLocation()),
+                                                   Ctor,
                                                    SourceLocation(),
+                                                   CtorArgs.takeAs<Expr>(),
+                                                   CtorArgs.size(), 
                                                    SourceLocation());
         AllToInit.push_back(Member);
       }
@@ -1332,7 +1372,7 @@ Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor,
           Diag(Constructor->getLocation(), diag::err_missing_default_ctor)
             << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
             << 0 << Base->getType();
-          Diag(BaseDecl->getLocation(), diag::note_previous_class_decl)
+          Diag(BaseDecl->getLocation(), diag::note_previous_decl)
             << Context.getTagDeclType(BaseDecl);
           HadError = true;
           continue;
@@ -1346,13 +1386,18 @@ Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor,
         MarkDeclarationReferenced(Constructor->getLocation(), Ctor);
 
         // FIXME: CXXBaseOrMemberInitializer should only contain a single 
-        // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary.
+        // subexpression so we can wrap it in a CXXExprWithTemporaries if 
+        // necessary.
+        // FIXME: Is there any better source-location information we can give?
         ExprTemporaries.clear();
         CXXBaseOrMemberInitializer *Member =
-          new (Context) CXXBaseOrMemberInitializer(Base->getType(),
-                                                   CtorArgs.takeAs<Expr>(),
-                                                   CtorArgs.size(), Ctor,
+          new (Context) CXXBaseOrMemberInitializer(Context,
+                             Context.getTrivialTypeSourceInfo(Base->getType(), 
+                                                              SourceLocation()),
+                                                   Ctor,
                                                    SourceLocation(),
+                                                   CtorArgs.takeAs<Expr>(),
+                                                   CtorArgs.size(), 
                                                    SourceLocation());
         AllToInit.push_back(Member);
       }
@@ -1399,7 +1444,7 @@ Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor,
           << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
           << 1 << (*Field)->getDeclName();
         Diag(Field->getLocation(), diag::note_field_decl);
-        Diag(RT->getDecl()->getLocation(), diag::note_previous_class_decl)
+        Diag(RT->getDecl()->getLocation(), diag::note_previous_decl)
           << Context.getTagDeclType(RT->getDecl());
         HadError = true;
         continue;
@@ -1427,9 +1472,12 @@ Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor,
       // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary.
       ExprTemporaries.clear();
       CXXBaseOrMemberInitializer *Member =
-        new (Context) CXXBaseOrMemberInitializer(*Field,CtorArgs.takeAs<Expr>(),
-                                                 CtorArgs.size(), Ctor,
+        new (Context) CXXBaseOrMemberInitializer(Context,
+                                                 *Field, SourceLocation(),
+                                                 Ctor,
                                                  SourceLocation(),
+                                                 CtorArgs.takeAs<Expr>(),
+                                                 CtorArgs.size(),
                                                  SourceLocation());
 
       AllToInit.push_back(Member);
@@ -1537,13 +1585,15 @@ void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl,
       if (FieldDecl *Field = Member->getMember())
         Diag(Member->getSourceLocation(),
              diag::error_multiple_mem_initialization)
-        << Field->getNameAsString();
+          << Field->getNameAsString()
+          << Member->getSourceRange();
       else {
         Type *BaseClass = Member->getBaseClass();
         assert(BaseClass && "ActOnMemInitializers - neither field or base");
         Diag(Member->getSourceLocation(),
              diag::error_multiple_base_initialization)
-          << QualType(BaseClass, 0);
+          << QualType(BaseClass, 0)
+          << Member->getSourceRange();
       }
       Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer)
         << 0;
@@ -1920,6 +1970,28 @@ namespace {
   };
 }
 
+/// \brief Perform semantic checks on a class definition that has been
+/// completing, introducing implicitly-declared members, checking for
+/// abstract types, etc.
+void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) {
+  if (!Record || Record->isInvalidDecl())
+    return;
+
+  if (!Record->isAbstract()) {
+    // Collect all the pure virtual methods and see if this is an abstract
+    // class after all.
+    PureVirtualMethodCollector Collector(Context, Record);
+    if (!Collector.empty())
+      Record->setAbstract(true);
+  }
+
+  if (Record->isAbstract())
+    (void)AbstractClassUsageDiagnoser(*this, Record);
+
+  if (!Record->isDependentType() && !Record->isInvalidDecl())
+    AddImplicitlyDeclaredMembersToClass(Record);
+}
+
 void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
                                              DeclPtrTy TagDecl,
                                              SourceLocation LBrac,
@@ -1928,24 +2000,13 @@ void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
     return;
 
   AdjustDeclIfTemplate(TagDecl);
+
   ActOnFields(S, RLoc, TagDecl,
               (DeclPtrTy*)FieldCollector->getCurFields(),
               FieldCollector->getCurNumFields(), LBrac, RBrac, 0);
 
-  CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>());
-  if (!RD->isAbstract()) {
-    // Collect all the pure virtual methods and see if this is an abstract
-    // class after all.
-    PureVirtualMethodCollector Collector(Context, RD);
-    if (!Collector.empty())
-      RD->setAbstract(true);
-  }
-
-  if (RD->isAbstract())
-    (void)AbstractClassUsageDiagnoser(*this, RD);
-
-  if (!RD->isDependentType() && !RD->isInvalidDecl())
-    AddImplicitlyDeclaredMembersToClass(RD);
+  CheckCompletedCXXClass(
+                      dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>()));
 }
 
 /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
@@ -1974,7 +2035,7 @@ void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
                                  ClassDecl->getLocation(), Name,
                                  Context.getFunctionType(Context.VoidTy,
                                                          0, 0, false, 0),
-                                 /*DInfo=*/0,
+                                 /*TInfo=*/0,
                                  /*isExplicit=*/false,
                                  /*isInline=*/true,
                                  /*isImplicitlyDeclared=*/true);
@@ -2046,7 +2107,7 @@ void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
                                    Context.getFunctionType(Context.VoidTy,
                                                            &ArgType, 1,
                                                            false, 0),
-                                   /*DInfo=*/0,
+                                   /*TInfo=*/0,
                                    /*isExplicit=*/false,
                                    /*isInline=*/true,
                                    /*isImplicitlyDeclared=*/true);
@@ -2058,7 +2119,7 @@ void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
     ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
                                                  ClassDecl->getLocation(),
                                                  /*IdentifierInfo=*/0,
-                                                 ArgType, /*DInfo=*/0,
+                                                 ArgType, /*TInfo=*/0,
                                                  VarDecl::None, 0);
     CopyConstructor->setParams(Context, &FromParam, 1);
     ClassDecl->addDecl(CopyConstructor);
@@ -2132,7 +2193,7 @@ void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
       CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name,
                             Context.getFunctionType(RetType, &ArgType, 1,
                                                     false, 0),
-                            /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true);
+                            /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true);
     CopyAssignment->setAccess(AS_public);
     CopyAssignment->setImplicit();
     CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment());
@@ -2142,13 +2203,14 @@ void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
     ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
                                                  ClassDecl->getLocation(),
                                                  /*IdentifierInfo=*/0,
-                                                 ArgType, /*DInfo=*/0,
+                                                 ArgType, /*TInfo=*/0,
                                                  VarDecl::None, 0);
     CopyAssignment->setParams(Context, &FromParam, 1);
 
     // Don't call addedAssignmentOperator. There is no way to distinguish an
     // implicit from an explicit assignment operator.
     ClassDecl->addDecl(CopyAssignment);
+    AddOverriddenMethods(ClassDecl, CopyAssignment);
   }
 
   if (!ClassDecl->hasUserDeclaredDestructor()) {
@@ -2814,6 +2876,7 @@ void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
 
 Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S,
                                             AccessSpecifier AS,
+                                            bool HasUsingKeyword,
                                             SourceLocation UsingLoc,
                                             const CXXScopeSpec &SS,
                                             UnqualifiedId &Name,
@@ -2830,6 +2893,9 @@ Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S,
     break;
       
   case UnqualifiedId::IK_ConstructorName:
+    // C++0x inherited constructors.
+    if (getLangOptions().CPlusPlus0x) break;
+
     Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor)
       << SS.getRange();
     return DeclPtrTy();
@@ -2846,45 +2912,237 @@ Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S,
   }
   
   DeclarationName TargetName = GetNameFromUnqualifiedId(Name);
+  if (!TargetName)
+    return DeclPtrTy();
+
+  // Warn about using declarations.
+  // TODO: store that the declaration was written without 'using' and
+  // talk about access decls instead of using decls in the
+  // diagnostics.
+  if (!HasUsingKeyword) {
+    UsingLoc = Name.getSourceRange().getBegin();
+    
+    Diag(UsingLoc, diag::warn_access_decl_deprecated)
+      << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(),
+                                               "using ");
+  }
+
   NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS,
                                         Name.getSourceRange().getBegin(),
                                         TargetName, AttrList,
                                         /* IsInstantiation */ false,
                                         IsTypeName, TypenameLoc);
-  if (UD) {
-    PushOnScopeChains(UD, S);
-    UD->setAccess(AS);
-  }
+  if (UD)
+    PushOnScopeChains(UD, S, /*AddToContext*/ false);
 
   return DeclPtrTy::make(UD);
 }
 
+/// Determines whether to create a using shadow decl for a particular
+/// decl, given the set of decls existing prior to this using lookup.
+bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig,
+                                const LookupResult &Previous) {
+  // Diagnose finding a decl which is not from a base class of the
+  // current class.  We do this now because there are cases where this
+  // function will silently decide not to build a shadow decl, which
+  // will pre-empt further diagnostics.
+  //
+  // We don't need to do this in C++0x because we do the check once on
+  // the qualifier.
+  //
+  // FIXME: diagnose the following if we care enough:
+  //   struct A { int foo; };
+  //   struct B : A { using A::foo; };
+  //   template <class T> struct C : A {};
+  //   template <class T> struct D : C<T> { using B::foo; } // <---
+  // This is invalid (during instantiation) in C++03 because B::foo
+  // resolves to the using decl in B, which is not a base class of D<T>.
+  // We can't diagnose it immediately because C<T> is an unknown
+  // specialization.  The UsingShadowDecl in D<T> then points directly
+  // to A::foo, which will look well-formed when we instantiate.
+  // The right solution is to not collapse the shadow-decl chain.
+  if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) {
+    DeclContext *OrigDC = Orig->getDeclContext();
+
+    // Handle enums and anonymous structs.
+    if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent();
+    CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC);
+    while (OrigRec->isAnonymousStructOrUnion())
+      OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext());
+
+    if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) {
+      if (OrigDC == CurContext) {
+        Diag(Using->getLocation(),
+             diag::err_using_decl_nested_name_specifier_is_current_class)
+          << Using->getNestedNameRange();
+        Diag(Orig->getLocation(), diag::note_using_decl_target);
+        return true;
+      }
+
+      Diag(Using->getNestedNameRange().getBegin(),
+           diag::err_using_decl_nested_name_specifier_is_not_base_class)
+        << Using->getTargetNestedNameDecl()
+        << cast<CXXRecordDecl>(CurContext)
+        << Using->getNestedNameRange();
+      Diag(Orig->getLocation(), diag::note_using_decl_target);
+      return true;
+    }
+  }
+
+  if (Previous.empty()) return false;
+
+  NamedDecl *Target = Orig;
+  if (isa<UsingShadowDecl>(Target))
+    Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
+
+  // If the target happens to be one of the previous declarations, we
+  // don't have a conflict.
+  // 
+  // FIXME: but we might be increasing its access, in which case we
+  // should redeclare it.
+  NamedDecl *NonTag = 0, *Tag = 0;
+  for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
+         I != E; ++I) {
+    NamedDecl *D = (*I)->getUnderlyingDecl();
+    if (D->getCanonicalDecl() == Target->getCanonicalDecl())
+      return false;
+
+    (isa<TagDecl>(D) ? Tag : NonTag) = D;
+  }
+
+  if (Target->isFunctionOrFunctionTemplate()) {
+    FunctionDecl *FD;
+    if (isa<FunctionTemplateDecl>(Target))
+      FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl();
+    else
+      FD = cast<FunctionDecl>(Target);
+
+    NamedDecl *OldDecl = 0;
+    switch (CheckOverload(FD, Previous, OldDecl)) {
+    case Ovl_Overload:
+      return false;
+
+    case Ovl_NonFunction:
+      Diag(Using->getLocation(), diag::err_using_decl_conflict);
+      break;
+      
+    // We found a decl with the exact signature.
+    case Ovl_Match:
+      if (isa<UsingShadowDecl>(OldDecl)) {
+        // Silently ignore the possible conflict.
+        return false;
+      }
+
+      // If we're in a record, we want to hide the target, so we
+      // return true (without a diagnostic) to tell the caller not to
+      // build a shadow decl.
+      if (CurContext->isRecord())
+        return true;
+
+      // If we're not in a record, this is an error.
+      Diag(Using->getLocation(), diag::err_using_decl_conflict);
+      break;
+    }
+
+    Diag(Target->getLocation(), diag::note_using_decl_target);
+    Diag(OldDecl->getLocation(), diag::note_using_decl_conflict);
+    return true;
+  }
+
+  // Target is not a function.
+
+  if (isa<TagDecl>(Target)) {
+    // No conflict between a tag and a non-tag.
+    if (!Tag) return false;
+
+    Diag(Using->getLocation(), diag::err_using_decl_conflict);
+    Diag(Target->getLocation(), diag::note_using_decl_target);
+    Diag(Tag->getLocation(), diag::note_using_decl_conflict);
+    return true;
+  }
+
+  // No conflict between a tag and a non-tag.
+  if (!NonTag) return false;
+
+  Diag(Using->getLocation(), diag::err_using_decl_conflict);
+  Diag(Target->getLocation(), diag::note_using_decl_target);
+  Diag(NonTag->getLocation(), diag::note_using_decl_conflict);
+  return true;
+}
+
 /// Builds a shadow declaration corresponding to a 'using' declaration.
-static UsingShadowDecl *BuildUsingShadowDecl(Sema &SemaRef, Scope *S,
-                                             AccessSpecifier AS,
-                                             UsingDecl *UD, NamedDecl *Orig) {
-  // FIXME: diagnose hiding, collisions
+UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S,
+                                            UsingDecl *UD,
+                                            NamedDecl *Orig) {
 
   // If we resolved to another shadow declaration, just coalesce them.
-  if (isa<UsingShadowDecl>(Orig)) {
-    Orig = cast<UsingShadowDecl>(Orig)->getTargetDecl();
-    assert(!isa<UsingShadowDecl>(Orig) && "nested shadow declaration");
+  NamedDecl *Target = Orig;
+  if (isa<UsingShadowDecl>(Target)) {
+    Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
+    assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration");
   }
   
   UsingShadowDecl *Shadow
-    = UsingShadowDecl::Create(SemaRef.Context, SemaRef.CurContext,
-                              UD->getLocation(), UD, Orig);
+    = UsingShadowDecl::Create(Context, CurContext,
+                              UD->getLocation(), UD, Target);
   UD->addShadowDecl(Shadow);
 
   if (S)
-    SemaRef.PushOnScopeChains(Shadow, S);
+    PushOnScopeChains(Shadow, S);
   else
-    SemaRef.CurContext->addDecl(Shadow);
-  Shadow->setAccess(AS);
+    CurContext->addDecl(Shadow);
+  Shadow->setAccess(UD->getAccess());
+
+  if (Orig->isInvalidDecl() || UD->isInvalidDecl())
+    Shadow->setInvalidDecl();
 
   return Shadow;
 }
 
+/// Hides a using shadow declaration.  This is required by the current
+/// using-decl implementation when a resolvable using declaration in a
+/// class is followed by a declaration which would hide or override
+/// one or more of the using decl's targets; for example:
+///
+///   struct Base { void foo(int); };
+///   struct Derived : Base {
+///     using Base::foo;
+///     void foo(int);
+///   };
+///
+/// The governing language is C++03 [namespace.udecl]p12:
+///
+///   When a using-declaration brings names from a base class into a
+///   derived class scope, member functions in the derived class
+///   override and/or hide member functions with the same name and
+///   parameter types in a base class (rather than conflicting).
+///
+/// There are two ways to implement this:
+///   (1) optimistically create shadow decls when they're not hidden
+///       by existing declarations, or
+///   (2) don't create any shadow decls (or at least don't make them
+///       visible) until we've fully parsed/instantiated the class.
+/// The problem with (1) is that we might have to retroactively remove
+/// a shadow decl, which requires several O(n) operations because the
+/// decl structures are (very reasonably) not designed for removal.
+/// (2) avoids this but is very fiddly and phase-dependent.
+void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) {
+  // Remove it from the DeclContext...
+  Shadow->getDeclContext()->removeDecl(Shadow);
+
+  // ...and the scope, if applicable...
+  if (S) {
+    S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow)));
+    IdResolver.RemoveDecl(Shadow);
+  }
+
+  // ...and the using decl.
+  Shadow->getUsingDecl()->removeShadowDecl(Shadow);
+
+  // TODO: complain somehow if Shadow was used.  It shouldn't
+  // be possible for this to happen, because 
+}
+
 /// Builds a using declaration.
 ///
 /// \param IsInstantiation - Whether this call arises from an
@@ -2910,56 +3168,76 @@ NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
     return 0;
   }
 
+  // Do the redeclaration lookup in the current scope.
+  LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName,
+                        ForRedeclaration);
+  Previous.setHideTags(false);
+  if (S) {
+    LookupName(Previous, S);
+
+    // It is really dumb that we have to do this.
+    LookupResult::Filter F = Previous.makeFilter();
+    while (F.hasNext()) {
+      NamedDecl *D = F.next();
+      if (!isDeclInScope(D, CurContext, S))
+        F.erase();
+    }
+    F.done();
+  } else {
+    assert(IsInstantiation && "no scope in non-instantiation");
+    assert(CurContext->isRecord() && "scope not record in instantiation");
+    LookupQualifiedName(Previous, CurContext);
+  }
+
   NestedNameSpecifier *NNS =
     static_cast<NestedNameSpecifier *>(SS.getScopeRep());
 
+  // Check for invalid redeclarations.
+  if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous))
+    return 0;
+
+  // Check for bad qualifiers.
+  if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc))
+    return 0;
+
   DeclContext *LookupContext = computeDeclContext(SS);
+  NamedDecl *D;
   if (!LookupContext) {
     if (IsTypeName) {
-      return UnresolvedUsingTypenameDecl::Create(Context, CurContext,
-                                                 UsingLoc, TypenameLoc,
-                                                 SS.getRange(), NNS,
-                                                 IdentLoc, Name);
-    } else {
-      return UnresolvedUsingValueDecl::Create(Context, CurContext,
-                                              UsingLoc, SS.getRange(), NNS,
+      // FIXME: not all declaration name kinds are legal here
+      D = UnresolvedUsingTypenameDecl::Create(Context, CurContext,
+                                              UsingLoc, TypenameLoc,
+                                              SS.getRange(), NNS,
                                               IdentLoc, Name);
+    } else {
+      D = UnresolvedUsingValueDecl::Create(Context, CurContext,
+                                           UsingLoc, SS.getRange(), NNS,
+                                           IdentLoc, Name);
     }
+  } else {
+    D = UsingDecl::Create(Context, CurContext, IdentLoc,
+                          SS.getRange(), UsingLoc, NNS, Name,
+                          IsTypeName);
   }
+  D->setAccess(AS);
+  CurContext->addDecl(D);
 
-  if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) {
-    // C++0x N2914 [namespace.udecl]p3:
-    // A using-declaration used as a member-declaration shall refer to a member
-    // of a base class of the class being defined, shall refer to a member of an
-    // anonymous union that is a member of a base class of the class being
-    // defined, or shall refer to an enumerator for an enumeration type that is
-    // a member of a base class of the class being defined.
-    
-    CXXRecordDecl *LookupRD = dyn_cast<CXXRecordDecl>(LookupContext);
-    if (!LookupRD || !RD->isDerivedFrom(LookupRD)) {
-      Diag(SS.getRange().getBegin(),
-           diag::err_using_decl_nested_name_specifier_is_not_a_base_class)
-        << NNS << RD->getDeclName();
-      return 0;
-    }
-  } else {
-    // C++0x N2914 [namespace.udecl]p8:
-    // A using-declaration for a class member shall be a member-declaration.
-    if (isa<CXXRecordDecl>(LookupContext)) {
-      Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member)
-        << SS.getRange();
-      return 0;
-    }
+  if (!LookupContext) return D;
+  UsingDecl *UD = cast<UsingDecl>(D);
+
+  if (RequireCompleteDeclContext(SS)) {
+    UD->setInvalidDecl();
+    return UD;
   }
 
-  // Look up the target name.  Unlike most lookups, we do not want to
-  // hide tag declarations: tag names are visible through the using
-  // declaration even if hidden by ordinary names.
+  // Look up the target name.
+
   LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName);
 
-  // We don't hide tags behind ordinary decls if we're in a
-  // non-dependent context, but in a dependent context, this is
-  // important for the stability of two-phase lookup.
+  // Unlike most lookups, we don't always want to hide tag
+  // declarations: tag names are visible through the using declaration
+  // even if hidden by ordinary names, *except* in a dependent context
+  // where it's important for the sanity of two-phase lookup.
   if (!IsInstantiation)
     R.setHideTags(false);
 
@@ -2968,54 +3246,243 @@ NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
   if (R.empty()) {
     Diag(IdentLoc, diag::err_no_member) 
       << Name << LookupContext << SS.getRange();
-    return 0;
+    UD->setInvalidDecl();
+    return UD;
   }
 
-  if (R.isAmbiguous())
-    return 0;
+  if (R.isAmbiguous()) {
+    UD->setInvalidDecl();
+    return UD;
+  }
 
   if (IsTypeName) {
     // If we asked for a typename and got a non-type decl, error out.
-    if (R.getResultKind() != LookupResult::Found
-        || !isa<TypeDecl>(R.getFoundDecl())) {
+    if (!R.getAsSingle<TypeDecl>()) {
       Diag(IdentLoc, diag::err_using_typename_non_type);
       for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
         Diag((*I)->getUnderlyingDecl()->getLocation(),
              diag::note_using_decl_target);
-      return 0;
+      UD->setInvalidDecl();
+      return UD;
     }
   } else {
     // If we asked for a non-typename and we got a type, error out,
     // but only if this is an instantiation of an unresolved using
     // decl.  Otherwise just silently find the type name.
-    if (IsInstantiation &&
-        R.getResultKind() == LookupResult::Found &&
-        isa<TypeDecl>(R.getFoundDecl())) {
+    if (IsInstantiation && R.getAsSingle<TypeDecl>()) {
       Diag(IdentLoc, diag::err_using_dependent_value_is_type);
       Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target);
-      return 0;
+      UD->setInvalidDecl();
+      return UD;
     }
   }
 
   // C++0x N2914 [namespace.udecl]p6:
   // A using-declaration shall not name a namespace.
-  if (R.getResultKind() == LookupResult::Found
-      && isa<NamespaceDecl>(R.getFoundDecl())) {
+  if (R.getAsSingle<NamespaceDecl>()) {
     Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace)
       << SS.getRange();
-    return 0;
+    UD->setInvalidDecl();
+    return UD;
   }
 
-  UsingDecl *UD = UsingDecl::Create(Context, CurContext, IdentLoc,
-                                    SS.getRange(), UsingLoc, NNS, Name,
-                                    IsTypeName);
-
-  for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
-    BuildUsingShadowDecl(*this, S, AS, UD, *I);
+  for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
+    if (!CheckUsingShadowDecl(UD, *I, Previous))
+      BuildUsingShadowDecl(S, UD, *I);
+  }
 
   return UD;
 }
 
+/// Checks that the given using declaration is not an invalid
+/// redeclaration.  Note that this is checking only for the using decl
+/// itself, not for any ill-formedness among the UsingShadowDecls.
+bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
+                                       bool isTypeName,
+                                       const CXXScopeSpec &SS,
+                                       SourceLocation NameLoc,
+                                       const LookupResult &Prev) {
+  // C++03 [namespace.udecl]p8:
+  // C++0x [namespace.udecl]p10:
+  //   A using-declaration is a declaration and can therefore be used
+  //   repeatedly where (and only where) multiple declarations are
+  //   allowed.
+  // That's only in file contexts.
+  if (CurContext->getLookupContext()->isFileContext())
+    return false;
+
+  NestedNameSpecifier *Qual
+    = static_cast<NestedNameSpecifier*>(SS.getScopeRep());
+
+  for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) {
+    NamedDecl *D = *I;
+
+    bool DTypename;
+    NestedNameSpecifier *DQual;
+    if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) {
+      DTypename = UD->isTypeName();
+      DQual = UD->getTargetNestedNameDecl();
+    } else if (UnresolvedUsingValueDecl *UD
+                 = dyn_cast<UnresolvedUsingValueDecl>(D)) {
+      DTypename = false;
+      DQual = UD->getTargetNestedNameSpecifier();
+    } else if (UnresolvedUsingTypenameDecl *UD
+                 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
+      DTypename = true;
+      DQual = UD->getTargetNestedNameSpecifier();
+    } else continue;
+
+    // using decls differ if one says 'typename' and the other doesn't.
+    // FIXME: non-dependent using decls?
+    if (isTypeName != DTypename) continue;
+
+    // using decls differ if they name different scopes (but note that
+    // template instantiation can cause this check to trigger when it
+    // didn't before instantiation).
+    if (Context.getCanonicalNestedNameSpecifier(Qual) !=
+        Context.getCanonicalNestedNameSpecifier(DQual))
+      continue;
+
+    Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange();
+    Diag(D->getLocation(), diag::note_using_decl) << 1;
+    return true;
+  }
+
+  return false;
+}
+
+
+/// Checks that the given nested-name qualifier used in a using decl
+/// in the current context is appropriately related to the current
+/// scope.  If an error is found, diagnoses it and returns true.
+bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc,
+                                   const CXXScopeSpec &SS,
+                                   SourceLocation NameLoc) {
+  DeclContext *NamedContext = computeDeclContext(SS);
+
+  if (!CurContext->isRecord()) {
+    // C++03 [namespace.udecl]p3:
+    // C++0x [namespace.udecl]p8:
+    //   A using-declaration for a class member shall be a member-declaration.
+
+    // If we weren't able to compute a valid scope, it must be a
+    // dependent class scope.
+    if (!NamedContext || NamedContext->isRecord()) {
+      Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member)
+        << SS.getRange();
+      return true;
+    }
+
+    // Otherwise, everything is known to be fine.
+    return false;
+  }
+
+  // The current scope is a record.
+
+  // If the named context is dependent, we can't decide much.
+  if (!NamedContext) {
+    // FIXME: in C++0x, we can diagnose if we can prove that the
+    // nested-name-specifier does not refer to a base class, which is
+    // still possible in some cases.
+
+    // Otherwise we have to conservatively report that things might be
+    // okay.
+    return false;
+  }
+
+  if (!NamedContext->isRecord()) {
+    // Ideally this would point at the last name in the specifier,
+    // but we don't have that level of source info.
+    Diag(SS.getRange().getBegin(),
+         diag::err_using_decl_nested_name_specifier_is_not_class)
+      << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange();
+    return true;
+  }
+
+  if (getLangOptions().CPlusPlus0x) {
+    // C++0x [namespace.udecl]p3:
+    //   In a using-declaration used as a member-declaration, the
+    //   nested-name-specifier shall name a base class of the class
+    //   being defined.
+
+    if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(
+                                 cast<CXXRecordDecl>(NamedContext))) {
+      if (CurContext == NamedContext) {
+        Diag(NameLoc,
+             diag::err_using_decl_nested_name_specifier_is_current_class)
+          << SS.getRange();
+        return true;
+      }
+
+      Diag(SS.getRange().getBegin(),
+           diag::err_using_decl_nested_name_specifier_is_not_base_class)
+        << (NestedNameSpecifier*) SS.getScopeRep()
+        << cast<CXXRecordDecl>(CurContext)
+        << SS.getRange();
+      return true;
+    }
+
+    return false;
+  }
+
+  // C++03 [namespace.udecl]p4:
+  //   A using-declaration used as a member-declaration shall refer
+  //   to a member of a base class of the class being defined [etc.].
+
+  // Salient point: SS doesn't have to name a base class as long as
+  // lookup only finds members from base classes.  Therefore we can
+  // diagnose here only if we can prove that that can't happen,
+  // i.e. if the class hierarchies provably don't intersect.
+
+  // TODO: it would be nice if "definitely valid" results were cached
+  // in the UsingDecl and UsingShadowDecl so that these checks didn't
+  // need to be repeated.
+
+  struct UserData {
+    llvm::DenseSet<const CXXRecordDecl*> Bases;
+
+    static bool collect(const CXXRecordDecl *Base, void *OpaqueData) {
+      UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
+      Data->Bases.insert(Base);
+      return true;
+    }
+
+    bool hasDependentBases(const CXXRecordDecl *Class) {
+      return !Class->forallBases(collect, this);
+    }
+
+    /// Returns true if the base is dependent or is one of the
+    /// accumulated base classes.
+    static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) {
+      UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
+      return !Data->Bases.count(Base);
+    }
+
+    bool mightShareBases(const CXXRecordDecl *Class) {
+      return Bases.count(Class) || !Class->forallBases(doesNotContain, this);
+    }
+  };
+
+  UserData Data;
+
+  // Returns false if we find a dependent base.
+  if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext)))
+    return false;
+
+  // Returns false if the class has a dependent base or if it or one
+  // of its bases is present in the base set of the current context.
+  if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext)))
+    return false;
+
+  Diag(SS.getRange().getBegin(),
+       diag::err_using_decl_nested_name_specifier_is_not_base_class)
+    << (NestedNameSpecifier*) SS.getScopeRep()
+    << cast<CXXRecordDecl>(CurContext)
+    << SS.getRange();
+
+  return true;
+}
+
 Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S,
                                              SourceLocation NamespaceLoc,
                                              SourceLocation AliasLoc,
@@ -3081,7 +3548,6 @@ void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
   } else {
     Constructor->setUsed();
   }
-  return;
 }
 
 void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
@@ -3163,7 +3629,8 @@ void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation,
     CXXRecordDecl *BaseClassDecl
       = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
     if (CXXMethodDecl *BaseAssignOpMethod =
-          getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl))
+          getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 
+                                  BaseClassDecl))
       MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod);
   }
   for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
@@ -3175,7 +3642,8 @@ void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation,
       CXXRecordDecl *FieldClassDecl
         = cast<CXXRecordDecl>(FieldClassType->getDecl());
       if (CXXMethodDecl *FieldAssignOpMethod =
-          getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl))
+          getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 
+                                  FieldClassDecl))
         MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod);
     } else if (FieldType->isReferenceType()) {
       Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
@@ -3196,7 +3664,8 @@ void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation,
 }
 
 CXXMethodDecl *
-Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl,
+Sema::getAssignOperatorMethod(SourceLocation CurrentLocation,
+                              ParmVarDecl *ParmDecl,
                               CXXRecordDecl *ClassDecl) {
   QualType LHSType = Context.getTypeDeclType(ClassDecl);
   QualType RHSType(LHSType);
@@ -3206,18 +3675,17 @@ Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl,
   RHSType = Context.getCVRQualifiedType(RHSType,
                                      ParmDecl->getType().getCVRQualifiers());
   ExprOwningPtr<Expr> LHS(this,  new (Context) DeclRefExpr(ParmDecl,
-                                                          LHSType,
-                                                          SourceLocation()));
+                                                           LHSType,
+                                                           SourceLocation()));
   ExprOwningPtr<Expr> RHS(this,  new (Context) DeclRefExpr(ParmDecl,
-                                                          RHSType,
-                                                          SourceLocation()));
+                                                           RHSType,
+                                                           CurrentLocation));
   Expr *Args[2] = { &*LHS, &*RHS };
   OverloadCandidateSet CandidateSet;
   AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2,
                               CandidateSet);
   OverloadCandidateSet::iterator Best;
-  if (BestViableFunction(CandidateSet,
-                         ClassDecl->getLocation(), Best) == OR_Success)
+  if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success)
     return cast<CXXMethodDecl>(Best->Function);
   assert(false &&
          "getAssignOperatorMethod - copy assignment operator method not found");
@@ -3286,8 +3754,10 @@ Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
     if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
       if (ICE->getCastKind() == CastExpr::CK_NoOp)
         E = ICE->getSubExpr();
-    
-    if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E))
+
+    if (CallExpr *CE = dyn_cast<CallExpr>(E))
+      Elidable = !CE->getCallReturnType()->isReferenceType();
+    else if (isa<CXXTemporaryObjectExpr>(E))
       Elidable = true;
   }
 
@@ -3428,7 +3898,9 @@ void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl,
                                            SourceRange(VDecl->getLocation(),
                                                        RParenLoc),
                                            VDecl->getDeclName(),
-                                           IK_Direct,
+                      InitializationKind::CreateDirect(VDecl->getLocation(), 
+                                                       LParenLoc, 
+                                                       RParenLoc),
                                            ConstructorArgs);
     if (!Constructor)
       RealDecl->setInvalidDecl();
@@ -3464,7 +3936,7 @@ static void AddConstructorInitializationCandidates(Sema &SemaRef,
                                                    QualType ClassType,
                                                    Expr **Args,
                                                    unsigned NumArgs,
-                                                  Sema::InitializationKind Kind,
+                                                   InitializationKind Kind,
                                            OverloadCandidateSet &CandidateSet) {
   // C++ [dcl.init]p14:
   //   If the initialization is direct-initialization, or if it is
@@ -3499,10 +3971,12 @@ static void AddConstructorInitializationCandidates(Sema &SemaRef,
     else
       Constructor = cast<CXXConstructorDecl>(*Con);
     
-    if ((Kind == Sema::IK_Direct) ||
-        (Kind == Sema::IK_Copy &&
+    if ((Kind.getKind() == InitializationKind::IK_Direct) ||
+        (Kind.getKind() == InitializationKind::IK_Value) ||
+        (Kind.getKind() == InitializationKind::IK_Copy &&
          Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) ||
-        (Kind == Sema::IK_Default && Constructor->isDefaultConstructor())) {
+        ((Kind.getKind() == InitializationKind::IK_Default) && 
+         Constructor->isDefaultConstructor())) {
       if (ConstructorTmpl)
         SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl,
                                              /*ExplicitArgs*/ 0,
@@ -3774,7 +4248,7 @@ Sema::CheckReferenceInit(Expr *&Init, QualType DeclType,
       // real, update the initializer with the resulting function.
       if (!ICS) {
         if (DiagnoseUseOfDecl(Fn, DeclLoc))
-          return true;
+          return true; 
 
         Init = FixOverloadedFunctionReference(Init, Fn);
       }
@@ -3874,23 +4348,28 @@ Sema::CheckReferenceInit(Expr *&Init, QualType DeclType,
       = T2RecordDecl->getVisibleConversionFunctions();
     for (UnresolvedSet::iterator I = Conversions->begin(),
            E = Conversions->end(); I != E; ++I) {
+      NamedDecl *D = *I;
+      CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
+      if (isa<UsingShadowDecl>(D))
+        D = cast<UsingShadowDecl>(D)->getTargetDecl();
+
       FunctionTemplateDecl *ConvTemplate
-        = dyn_cast<FunctionTemplateDecl>(*I);
+        = dyn_cast<FunctionTemplateDecl>(D);
       CXXConversionDecl *Conv;
       if (ConvTemplate)
         Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
       else
-        Conv = cast<CXXConversionDecl>(*I);
+        Conv = cast<CXXConversionDecl>(D);
       
       // If the conversion function doesn't return a reference type,
       // it can't be considered for this conversion.
       if (Conv->getConversionType()->isLValueReferenceType() &&
           (AllowExplicit || !Conv->isExplicit())) {
         if (ConvTemplate)
-          AddTemplateConversionCandidate(ConvTemplate, Init, DeclType,
-                                         CandidateSet);
+          AddTemplateConversionCandidate(ConvTemplate, ActingDC,
+                                         Init, DeclType, CandidateSet);
         else
-          AddConversionCandidate(Conv, Init, DeclType, CandidateSet);
+          AddConversionCandidate(Conv, ActingDC, Init, DeclType, CandidateSet);
       }
     }
 
@@ -4125,6 +4604,138 @@ Sema::CheckReferenceInit(Expr *&Init, QualType DeclType,
   }
 }
 
+static inline bool
+CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 
+                                       const FunctionDecl *FnDecl) {
+  const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext();
+  if (isa<NamespaceDecl>(DC)) {
+    return SemaRef.Diag(FnDecl->getLocation(), 
+                        diag::err_operator_new_delete_declared_in_namespace)
+      << FnDecl->getDeclName();
+  }
+  
+  if (isa<TranslationUnitDecl>(DC) && 
+      FnDecl->getStorageClass() == FunctionDecl::Static) {
+    return SemaRef.Diag(FnDecl->getLocation(),
+                        diag::err_operator_new_delete_declared_static)
+      << FnDecl->getDeclName();
+  }
+  
+  return false;
+}
+
+static inline bool
+CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl,
+                            CanQualType ExpectedResultType,
+                            CanQualType ExpectedFirstParamType,
+                            unsigned DependentParamTypeDiag,
+                            unsigned InvalidParamTypeDiag) {
+  QualType ResultType = 
+    FnDecl->getType()->getAs<FunctionType>()->getResultType();
+
+  // Check that the result type is not dependent.
+  if (ResultType->isDependentType())
+    return SemaRef.Diag(FnDecl->getLocation(),
+                        diag::err_operator_new_delete_dependent_result_type)
+    << FnDecl->getDeclName() << ExpectedResultType;
+
+  // Check that the result type is what we expect.
+  if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType)
+    return SemaRef.Diag(FnDecl->getLocation(),
+                        diag::err_operator_new_delete_invalid_result_type) 
+    << FnDecl->getDeclName() << ExpectedResultType;
+  
+  // A function template must have at least 2 parameters.
+  if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2)
+    return SemaRef.Diag(FnDecl->getLocation(),
+                      diag::err_operator_new_delete_template_too_few_parameters)
+        << FnDecl->getDeclName();
+  
+  // The function decl must have at least 1 parameter.
+  if (FnDecl->getNumParams() == 0)
+    return SemaRef.Diag(FnDecl->getLocation(),
+                        diag::err_operator_new_delete_too_few_parameters)
+      << FnDecl->getDeclName();
+ 
+  // Check the the first parameter type is not dependent.
+  QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
+  if (FirstParamType->isDependentType())
+    return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag)
+      << FnDecl->getDeclName() << ExpectedFirstParamType;
+
+  // Check that the first parameter type is what we expect.
+  if (SemaRef.Context.getCanonicalType(FirstParamType) != 
+      ExpectedFirstParamType)
+    return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag)
+    << FnDecl->getDeclName() << ExpectedFirstParamType;
+  
+  return false;
+}
+
+static bool
+CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
+  // C++ [basic.stc.dynamic.allocation]p1:
+  //   A program is ill-formed if an allocation function is declared in a
+  //   namespace scope other than global scope or declared static in global 
+  //   scope.
+  if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
+    return true;
+
+  CanQualType SizeTy = 
+    SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType());
+
+  // C++ [basic.stc.dynamic.allocation]p1:
+  //  The return type shall be void*. The first parameter shall have type 
+  //  std::size_t.
+  if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 
+                                  SizeTy,
+                                  diag::err_operator_new_dependent_param_type,
+                                  diag::err_operator_new_param_type))
+    return true;
+
+  // C++ [basic.stc.dynamic.allocation]p1:
+  //  The first parameter shall not have an associated default argument.
+  if (FnDecl->getParamDecl(0)->hasDefaultArg())
+    return SemaRef.Diag(FnDecl->getLocation(),
+                        diag::err_operator_new_default_arg)
+      << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange();
+
+  return false;
+}
+
+static bool
+CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
+  // C++ [basic.stc.dynamic.deallocation]p1:
+  //   A program is ill-formed if deallocation functions are declared in a
+  //   namespace scope other than global scope or declared static in global 
+  //   scope.
+  if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
+    return true;
+
+  // C++ [basic.stc.dynamic.deallocation]p2:
+  //   Each deallocation function shall return void and its first parameter 
+  //   shall be void*.
+  if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 
+                                  SemaRef.Context.VoidPtrTy,
+                                 diag::err_operator_delete_dependent_param_type,
+                                 diag::err_operator_delete_param_type))
+    return true;
+
+  QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
+  if (FirstParamType->isDependentType())
+    return SemaRef.Diag(FnDecl->getLocation(),
+                        diag::err_operator_delete_dependent_param_type)
+    << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy;
+
+  if (SemaRef.Context.getCanonicalType(FirstParamType) != 
+      SemaRef.Context.VoidPtrTy)
+    return SemaRef.Diag(FnDecl->getLocation(),
+                        diag::err_operator_delete_param_type)
+      << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy;
+  
+  return false;
+}
+
 /// CheckOverloadedOperatorDeclaration - Check whether the declaration
 /// of this overloaded operator is well-formed. If so, returns false;
 /// otherwise, emits appropriate diagnostics and returns true.
@@ -4140,29 +4751,11 @@ bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
   //   described completely in 3.7.3. The attributes and restrictions
   //   found in the rest of this subclause do not apply to them unless
   //   explicitly stated in 3.7.3.
-  // FIXME: Write a separate routine for checking this. For now, just allow it.
   if (Op == OO_Delete || Op == OO_Array_Delete)
-    return false;
+    return CheckOperatorDeleteDeclaration(*this, FnDecl);
   
-  if (Op == OO_New || Op == OO_Array_New) {
-    bool ret = false;
-    if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) {
-      QualType SizeTy = Context.getCanonicalType(Context.getSizeType());
-      QualType T = Context.getCanonicalType((*Param)->getType());
-      if (!T->isDependentType() && SizeTy != T) {
-        Diag(FnDecl->getLocation(),
-             diag::err_operator_new_param_type) << FnDecl->getDeclName()
-              << SizeTy;
-        ret = true;
-      }
-    }
-    QualType ResultTy = Context.getCanonicalType(FnDecl->getResultType());
-    if (!ResultTy->isDependentType() && ResultTy != Context.VoidPtrTy)
-      return Diag(FnDecl->getLocation(),
-                  diag::err_operator_new_result_type) << FnDecl->getDeclName()
-                  << static_cast<QualType>(Context.VoidPtrTy);
-    return ret;
-  }
+  if (Op == OO_New || Op == OO_Array_New)
+    return CheckOperatorNewDeclaration(*this, FnDecl);
 
   // C++ [over.oper]p6:
   //   An operator function shall either be a non-static member
@@ -4201,14 +4794,10 @@ bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
   if (Op != OO_Call) {
     for (FunctionDecl::param_iterator Param = FnDecl->param_begin();
          Param != FnDecl->param_end(); ++Param) {
-      if ((*Param)->hasUnparsedDefaultArg())
+      if ((*Param)->hasDefaultArg())
         return Diag((*Param)->getLocation(),
                     diag::err_operator_overload_default_arg)
-          << FnDecl->getDeclName();
-      else if (Expr *DefArg = (*Param)->getDefaultArg())
-        return Diag((*Param)->getLocation(),
-                    diag::err_operator_overload_default_arg)
-          << FnDecl->getDeclName() << DefArg->getSourceRange();
+          << FnDecl->getDeclName() << (*Param)->getDefaultArgRange();
     }
   }
 
@@ -4346,7 +4935,7 @@ Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S,
 /// occurs within a C++ catch clause, returning the newly-created
 /// variable.
 VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType,
-                                         DeclaratorInfo *DInfo,
+                                         TypeSourceInfo *TInfo,
                                          IdentifierInfo *Name,
                                          SourceLocation Loc,
                                          SourceRange Range) {
@@ -4396,7 +4985,7 @@ VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType,
   // FIXME: Need to check for abstract classes.
 
   VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc,
-                                    Name, ExDeclType, DInfo, VarDecl::None);
+                                    Name, ExDeclType, TInfo, VarDecl::None);
 
   if (Invalid)
     ExDecl->setInvalidDecl();
@@ -4407,8 +4996,8 @@ VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType,
 /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
 /// handler.
 Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
-  DeclaratorInfo *DInfo = 0;
-  QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo);
+  TypeSourceInfo *TInfo = 0;
+  QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo);
 
   bool Invalid = D.isInvalidType();
   IdentifierInfo *II = D.getIdentifier();
@@ -4428,7 +5017,7 @@ Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
     Invalid = true;
   }
 
-  VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo,
+  VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo,
                                               D.getIdentifier(),
                                               D.getIdentifierLoc(),
                                             D.getDeclSpec().getSourceRange());
@@ -4462,10 +5051,8 @@ Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc,
     }
 
     if (Value == 0) {
-      std::string str(AssertMessage->getStrData(),
-                      AssertMessage->getByteLength());
       Diag(AssertLoc, diag::err_static_assert_failed)
-        << str << AssertExpr->getSourceRange();
+        << AssertMessage->getString() << AssertExpr->getSourceRange();
     }
   }
 
@@ -4602,8 +5189,8 @@ Sema::ActOnFriendFunctionDecl(Scope *S,
   assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
 
   SourceLocation Loc = D.getIdentifierLoc();
-  DeclaratorInfo *DInfo = 0;
-  QualType T = GetTypeForDeclarator(D, S, &DInfo);
+  TypeSourceInfo *TInfo = 0;
+  QualType T = GetTypeForDeclarator(D, S, &TInfo);
 
   // C++ [class.friend]p1
   //   A friend of a class is a function or class....
@@ -4726,7 +5313,7 @@ Sema::ActOnFriendFunctionDecl(Scope *S,
   }
 
   bool Redeclaration = false;
-  NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, DInfo, Previous,
+  NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous,
                                           move(TemplateParams),
                                           IsDefinition,
                                           Redeclaration);
@@ -4890,6 +5477,26 @@ bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New,
   return false;
 }
 
+/// \brief Mark the given method pure.
+///
+/// \param Method the method to be marked pure.
+///
+/// \param InitRange the source range that covers the "0" initializer.
+bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) {
+  if (Method->isVirtual() || Method->getParent()->isDependentContext()) {
+    Method->setPure();
+    
+    // A class is abstract if at least one function is pure virtual.
+    Method->getParent()->setAbstract(true);
+    return false;
+  } 
+
+  if (!Method->isInvalidDecl())
+    Diag(Method->getLocation(), diag::err_non_virtual_pure)
+      << Method->getDeclName() << InitRange;
+  return true;
+}
+
 /// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an
 /// initializer for the declaration 'Dcl'.
 /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
@@ -4949,9 +5556,9 @@ Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) {
   assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
          "Parser allowed 'typedef' as storage class of condition decl.");
   
-  DeclaratorInfo *DInfo = 0;
+  TypeSourceInfo *TInfo = 0;
   TagDecl *OwnedTag = 0;
-  QualType Ty = GetTypeForDeclarator(D, S, &DInfo, &OwnedTag);
+  QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag);
   
   if (Ty->isFunctionType()) { // The declarator shall not specify a function...
                               // We exit without creating a CXXConditionDeclExpr because a FunctionDecl
@@ -4972,3 +5579,80 @@ Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) {
   VD->setDeclaredInCondition(true);
   return Dcl;
 }
+
+void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc,
+                                             CXXMethodDecl *MD) {
+  // Ignore dependent types.
+  if (MD->isDependentContext())
+    return;
+  
+  CXXRecordDecl *RD = MD->getParent();
+  
+  // Ignore classes without a vtable.
+  if (!RD->isDynamicClass())
+    return;
+
+  if (!MD->isOutOfLine()) {
+    // The only inline functions we care about are constructors. We also defer
+    // marking the virtual members as referenced until we've reached the end
+    // of the translation unit. We do this because we need to know the key
+    // function of the class in order to determine the key function.
+    if (isa<CXXConstructorDecl>(MD))
+      ClassesWithUnmarkedVirtualMembers.insert(std::make_pair(RD, Loc));
+    return;
+  }
+  
+  const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD);
+
+  if (!KeyFunction) {
+    // This record does not have a key function, so we assume that the vtable
+    // will be emitted when it's used by the constructor.
+    if (!isa<CXXConstructorDecl>(MD))
+      return;
+  } else if (KeyFunction->getCanonicalDecl() != MD->getCanonicalDecl()) {
+    // We don't have the right key function.
+    return;
+  }
+  
+  // Mark the members as referenced.
+  MarkVirtualMembersReferenced(Loc, RD);
+  ClassesWithUnmarkedVirtualMembers.erase(RD);
+}
+
+bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() {
+  if (ClassesWithUnmarkedVirtualMembers.empty())
+    return false;
+  
+  for (std::map<CXXRecordDecl *, SourceLocation>::iterator i = 
+       ClassesWithUnmarkedVirtualMembers.begin(), 
+       e = ClassesWithUnmarkedVirtualMembers.end(); i != e; ++i) {
+    CXXRecordDecl *RD = i->first;
+    
+    const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD);
+    if (KeyFunction) {
+      // We know that the class has a key function. If the key function was
+      // declared in this translation unit, then it the class decl would not 
+      // have been in the ClassesWithUnmarkedVirtualMembers map.
+      continue;
+    }
+    
+    SourceLocation Loc = i->second;
+    MarkVirtualMembersReferenced(Loc, RD);
+  }
+  
+  ClassesWithUnmarkedVirtualMembers.clear();
+  return true;
+}
+
+void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) {
+  for (CXXRecordDecl::method_iterator i = RD->method_begin(), 
+       e = RD->method_end(); i != e; ++i) {
+    CXXMethodDecl *MD = *i;
+
+    // C++ [basic.def.odr]p2:
+    //   [...] A virtual member function is used if it is not pure. [...]
+    if (MD->isVirtual() && !MD->isPure())
+      MarkDeclarationReferenced(Loc, MD);
+  }
+}
+
diff --git a/lib/Sema/SemaDeclObjC.cpp b/lib/Sema/SemaDeclObjC.cpp
index 7da37af..a768e1b 100644
--- a/lib/Sema/SemaDeclObjC.cpp
+++ b/lib/Sema/SemaDeclObjC.cpp
@@ -1349,10 +1349,10 @@ ObjCMethodDecl *Sema::LookupInstanceMethodInGlobalPool(Selector Sel,
   }
   if (issueWarning && (MethList.Method && MethList.Next)) {
     Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R;
-    Diag(MethList.Method->getLocStart(), diag::note_using_decl)
+    Diag(MethList.Method->getLocStart(), diag::note_using)
       << MethList.Method->getSourceRange();
     for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next)
-      Diag(Next->Method->getLocStart(), diag::note_also_found_decl)
+      Diag(Next->Method->getLocStart(), diag::note_also_found)
         << Next->Method->getSourceRange();
   }
   return MethList.Method;
@@ -1413,10 +1413,10 @@ ObjCMethodDecl *Sema::LookupFactoryMethodInGlobalPool(Selector Sel,
   }
   if (issueWarning && (MethList.Method && MethList.Next)) {
     Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R;
-    Diag(MethList.Method->getLocStart(), diag::note_using_decl)
+    Diag(MethList.Method->getLocStart(), diag::note_using)
       << MethList.Method->getSourceRange();
     for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next)
-      Diag(Next->Method->getLocStart(), diag::note_also_found_decl)
+      Diag(Next->Method->getLocStart(), diag::note_also_found)
         << Next->Method->getSourceRange();
   }
   return MethList.Method;
@@ -1495,7 +1495,7 @@ void Sema::ProcessPropertyDecl(ObjCPropertyDecl *property,
                                                   property->getLocation(),
                                                   property->getIdentifier(),
                                                   property->getType(),
-                                                  /*DInfo=*/0,
+                                                  /*TInfo=*/0,
                                                   VarDecl::None,
                                                   0);
       SetterMethod->setMethodParams(Context, &Argument, 1);
@@ -1765,7 +1765,7 @@ Sema::DeclPtrTy Sema::ActOnMethodDeclaration(
 
   for (unsigned i = 0, e = Sel.getNumArgs(); i != e; ++i) {
     QualType ArgType;
-    DeclaratorInfo *DI;
+    TypeSourceInfo *DI;
 
     if (ArgInfo[i].Type == 0) {
       ArgType = Context.getObjCIdType();
diff --git a/lib/Sema/SemaExceptionSpec.cpp b/lib/Sema/SemaExceptionSpec.cpp
index 25af052..7e2a98d 100644
--- a/lib/Sema/SemaExceptionSpec.cpp
+++ b/lib/Sema/SemaExceptionSpec.cpp
@@ -35,10 +35,15 @@ static const FunctionProtoType *GetUnderlyingFunction(QualType T)
 /// exception specification. Incomplete types, or pointers to incomplete types
 /// other than void are not allowed.
 bool Sema::CheckSpecifiedExceptionType(QualType T, const SourceRange &Range) {
-  // FIXME: This may not correctly work with the fix for core issue 437,
-  // where a class's own type is considered complete within its body. But
-  // perhaps RequireCompleteType itself should contain this logic?
 
+  // This check (and the similar one below) deals with issue 437, that changes
+  // C++ 9.2p2 this way:
+  // Within the class member-specification, the class is regarded as complete
+  // within function bodies, default arguments, exception-specifications, and
+  // constructor ctor-initializers (including such things in nested classes).
+  if (T->isRecordType() && T->getAs<RecordType>()->isBeingDefined())
+    return false;
+    
   // C++ 15.4p2: A type denoted in an exception-specification shall not denote
   //   an incomplete type.
   if (RequireCompleteType(Range.getBegin(), T,
@@ -58,8 +63,12 @@ bool Sema::CheckSpecifiedExceptionType(QualType T, const SourceRange &Range) {
   } else
     return false;
 
+  // Again as before
+  if (T->isRecordType() && T->getAs<RecordType>()->isBeingDefined())
+    return false;
+    
   if (!T->isVoidType() && RequireCompleteType(Range.getBegin(), T,
-      PDiag(diag::err_incomplete_in_exception_spec) << /*direct*/kind << Range))
+      PDiag(diag::err_incomplete_in_exception_spec) << kind << Range))
     return true;
 
   return false;
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index f653cf6..358f445 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -259,15 +259,43 @@ bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) {
   DefaultArgumentPromotion(Expr);
 
   if (Expr->getType()->isObjCInterfaceType()) {
-    Diag(Expr->getLocStart(),
-         diag::err_cannot_pass_objc_interface_to_vararg)
-      << Expr->getType() << CT;
-    return true;
+    switch (ExprEvalContexts.back().Context ) {
+    case Unevaluated:
+      // The argument will never be evaluated, so don't complain.
+      break;
+
+    case PotentiallyEvaluated:
+      Diag(Expr->getLocStart(),
+           diag::err_cannot_pass_objc_interface_to_vararg)
+        << Expr->getType() << CT;
+      return true;
+
+    case PotentiallyPotentiallyEvaluated:
+      ExprEvalContexts.back().addDiagnostic(Expr->getLocStart(),
+                           PDiag(diag::err_cannot_pass_objc_interface_to_vararg) 
+                             << Expr->getType() << CT);
+      break;
+    }
   }
 
-  if (!Expr->getType()->isPODType())
-    Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg)
-      << Expr->getType() << CT;
+  if (!Expr->getType()->isPODType()) {
+    switch (ExprEvalContexts.back().Context ) {
+    case Unevaluated:
+      // The argument will never be evaluated, so don't complain.
+      break;
+
+    case PotentiallyEvaluated:
+      Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg)
+        << Expr->getType() << CT;
+      break;
+
+    case PotentiallyPotentiallyEvaluated:
+      ExprEvalContexts.back().addDiagnostic(Expr->getLocStart(),
+                           PDiag(diag::warn_cannot_pass_non_pod_arg_to_vararg) 
+                             << Expr->getType() << CT);
+      break;
+    }
+  }
 
   return false;
 }
@@ -415,7 +443,7 @@ static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock,
 
 /// BuildDeclRefExpr - Build a DeclRefExpr.
 Sema::OwningExprResult
-Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc,
+Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, SourceLocation Loc,
                        const CXXScopeSpec *SS) {
   if (Context.getCanonicalType(Ty) == Context.UndeducedAutoTy) {
     Diag(Loc,
@@ -605,6 +633,7 @@ Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc,
       MemberType = Context.getQualifiedType(MemberType, NewQuals);
 
     MarkDeclarationReferenced(Loc, *FI);
+    PerformObjectMemberConversion(Result, *FI);
     // FIXME: Might this end up being a qualified name?
     Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI,
                                       OpLoc, MemberType);
@@ -665,9 +694,9 @@ static void DecomposeTemplateName(LookupResult &R, const UnqualifiedId &Id) {
 
   if (TemplateDecl *TD = TName.getAsTemplateDecl())
     R.addDecl(TD);
-  else if (OverloadedFunctionDecl *OD
-             = TName.getAsOverloadedFunctionDecl())
-    for (OverloadIterator I(OD), E; I != E; ++I)
+  else if (OverloadedTemplateStorage *OT = TName.getAsOverloadedTemplate())
+    for (OverloadedTemplateStorage::iterator I = OT->begin(), E = OT->end();
+           I != E; ++I)
       R.addDecl(*I);
 
   R.resolveKind();
@@ -703,18 +732,188 @@ static bool IsDependentIdExpression(Sema &SemaRef, const CXXScopeSpec &SS) {
   // We can't look into record types unless they're fully-formed.
   if (!IsFullyFormedScope(SemaRef, cast<CXXRecordDecl>(DC))) return true;
 
-  // We can always look into fully-formed record types, but if we're
-  // in a dependent but not fully-formed context, we can't decide
-  // whether the qualifier names a base class.  We shouldn't be trying
-  // to decide that yet anyway, but we are, so we need to delay that
-  // decision.
-  CXXRecordDecl *CurRecord;
-  if (CXXMethodDecl *CurMethod = dyn_cast<CXXMethodDecl>(SemaRef.CurContext))
-    CurRecord = cast<CXXRecordDecl>(CurMethod->getParent());
-  else
-    CurRecord = dyn_cast<CXXRecordDecl>(SemaRef.CurContext);
+  return false;
+}
+
+/// Determines if the given class is provably not derived from all of
+/// the prospective base classes.
+static bool IsProvablyNotDerivedFrom(Sema &SemaRef,
+                                     CXXRecordDecl *Record,
+                            const llvm::SmallPtrSet<CXXRecordDecl*, 4> &Bases) {
+  if (Bases.count(Record->getCanonicalDecl()))
+    return false;
+
+  RecordDecl *RD = Record->getDefinition(SemaRef.Context);
+  if (!RD) return false;
+  Record = cast<CXXRecordDecl>(RD);
+
+  for (CXXRecordDecl::base_class_iterator I = Record->bases_begin(),
+         E = Record->bases_end(); I != E; ++I) {
+    CanQualType BaseT = SemaRef.Context.getCanonicalType((*I).getType());
+    CanQual<RecordType> BaseRT = BaseT->getAs<RecordType>();
+    if (!BaseRT) return false;
+
+    CXXRecordDecl *BaseRecord = cast<CXXRecordDecl>(BaseRT->getDecl());
+    if (!IsProvablyNotDerivedFrom(SemaRef, BaseRecord, Bases))
+      return false;
+  }
+
+  return true;
+}
+                                  
+/// Determines if this a C++ class member.
+static bool IsClassMember(NamedDecl *D) {
+  DeclContext *DC = D->getDeclContext();
+
+  // C++0x [class.mem]p1:
+  //   The enumerators of an unscoped enumeration defined in
+  //   the class are members of the class.
+  // FIXME: support C++0x scoped enumerations.
+  if (isa<EnumDecl>(DC))
+    DC = DC->getParent();
+
+  return DC->isRecord();
+}
+
+/// Determines if this is an instance member of a class.
+static bool IsInstanceMember(NamedDecl *D) {
+  assert(IsClassMember(D) &&
+         "checking whether non-member is instance member");
+
+  if (isa<FieldDecl>(D)) return true;
+  
+  if (isa<CXXMethodDecl>(D))
+    return !cast<CXXMethodDecl>(D)->isStatic();
+
+  if (isa<FunctionTemplateDecl>(D)) {
+    D = cast<FunctionTemplateDecl>(D)->getTemplatedDecl();
+    return !cast<CXXMethodDecl>(D)->isStatic();
+  }
+
+  return false;
+}
+
+enum IMAKind {
+  /// The reference is definitely not an instance member access.
+  IMA_Static,
+
+  /// The reference may be an implicit instance member access.
+  IMA_Mixed,
+
+  /// The reference may be to an instance member, but it is invalid if
+  /// so, because the context is not an instance method.
+  IMA_Mixed_StaticContext,
+
+  /// The reference may be to an instance member, but it is invalid if
+  /// so, because the context is from an unrelated class.
+  IMA_Mixed_Unrelated,
+
+  /// The reference is definitely an implicit instance member access.
+  IMA_Instance,
+
+  /// The reference may be to an unresolved using declaration.
+  IMA_Unresolved,
+
+  /// The reference may be to an unresolved using declaration and the
+  /// context is not an instance method.
+  IMA_Unresolved_StaticContext,
+
+  /// The reference is to a member of an anonymous structure in a
+  /// non-class context.
+  IMA_AnonymousMember,
 
-  return CurRecord && !IsFullyFormedScope(SemaRef, CurRecord);
+  /// All possible referrents are instance members and the current
+  /// context is not an instance method.
+  IMA_Error_StaticContext,
+
+  /// All possible referrents are instance members of an unrelated
+  /// class.
+  IMA_Error_Unrelated
+};
+
+/// The given lookup names class member(s) and is not being used for
+/// an address-of-member expression.  Classify the type of access
+/// according to whether it's possible that this reference names an
+/// instance member.  This is best-effort; it is okay to
+/// conservatively answer "yes", in which case some errors will simply
+/// not be caught until template-instantiation.
+static IMAKind ClassifyImplicitMemberAccess(Sema &SemaRef,
+                                            const LookupResult &R) {
+  assert(!R.empty() && IsClassMember(*R.begin()));
+
+  bool isStaticContext =
+    (!isa<CXXMethodDecl>(SemaRef.CurContext) ||
+     cast<CXXMethodDecl>(SemaRef.CurContext)->isStatic());
+
+  if (R.isUnresolvableResult())
+    return isStaticContext ? IMA_Unresolved_StaticContext : IMA_Unresolved;
+
+  // Collect all the declaring classes of instance members we find.
+  bool hasNonInstance = false;
+  llvm::SmallPtrSet<CXXRecordDecl*, 4> Classes;
+  for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
+    NamedDecl *D = (*I)->getUnderlyingDecl();
+    if (IsInstanceMember(D)) {
+      CXXRecordDecl *R = cast<CXXRecordDecl>(D->getDeclContext());
+
+      // If this is a member of an anonymous record, move out to the
+      // innermost non-anonymous struct or union.  If there isn't one,
+      // that's a special case.
+      while (R->isAnonymousStructOrUnion()) {
+        R = dyn_cast<CXXRecordDecl>(R->getParent());
+        if (!R) return IMA_AnonymousMember;
+      }
+      Classes.insert(R->getCanonicalDecl());
+    }
+    else
+      hasNonInstance = true;
+  }
+
+  // If we didn't find any instance members, it can't be an implicit
+  // member reference.
+  if (Classes.empty())
+    return IMA_Static;
+
+  // If the current context is not an instance method, it can't be
+  // an implicit member reference.
+  if (isStaticContext)
+    return (hasNonInstance ? IMA_Mixed_StaticContext : IMA_Error_StaticContext);
+
+  // If we can prove that the current context is unrelated to all the
+  // declaring classes, it can't be an implicit member reference (in
+  // which case it's an error if any of those members are selected).
+  if (IsProvablyNotDerivedFrom(SemaRef,
+                        cast<CXXMethodDecl>(SemaRef.CurContext)->getParent(),
+                               Classes))
+    return (hasNonInstance ? IMA_Mixed_Unrelated : IMA_Error_Unrelated);
+
+  return (hasNonInstance ? IMA_Mixed : IMA_Instance);
+}
+
+/// Diagnose a reference to a field with no object available.
+static void DiagnoseInstanceReference(Sema &SemaRef,
+                                      const CXXScopeSpec &SS,
+                                      const LookupResult &R) {
+  SourceLocation Loc = R.getNameLoc();
+  SourceRange Range(Loc);
+  if (SS.isSet()) Range.setBegin(SS.getRange().getBegin());
+
+  if (R.getAsSingle<FieldDecl>()) {
+    if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(SemaRef.CurContext)) {
+      if (MD->isStatic()) {
+        // "invalid use of member 'x' in static member function"
+        SemaRef.Diag(Loc, diag::err_invalid_member_use_in_static_method)
+          << Range << R.getLookupName();
+        return;
+      }
+    }
+
+    SemaRef.Diag(Loc, diag::err_invalid_non_static_member_use)
+      << R.getLookupName() << Range;
+    return;
+  }
+
+  SemaRef.Diag(Loc, diag::err_member_call_without_object) << Range;
 }
 
 Sema::OwningExprResult Sema::ActOnIdExpression(Scope *S,
@@ -746,10 +945,8 @@ Sema::OwningExprResult Sema::ActOnIdExpression(Scope *S,
   // Determine whether this is a member of an unknown specialization;
   // we need to handle these differently.
   if (SS.isSet() && IsDependentIdExpression(*this, SS)) {
-    bool CheckForImplicitMember = !isAddressOfOperand;
-
     return ActOnDependentIdExpression(SS, Name, NameLoc,
-                                      CheckForImplicitMember,
+                                      isAddressOfOperand,
                                       TemplateArgs);
   }
 
@@ -847,23 +1044,41 @@ Sema::OwningExprResult Sema::ActOnIdExpression(Scope *S,
     }
   }
 
-  // &SomeClass::foo is an abstract member reference, regardless of
-  // the nature of foo, but &SomeClass::foo(...) is not.  If this is
-  // *not* an abstract member reference, and any of the results is a
-  // class member (which necessarily means they're all class members),
-  // then we make an implicit member reference instead.
-  //
-  // This check considers all the same information as the "needs ADL"
-  // check, but there's no simple logical relationship other than the
-  // fact that they can never be simultaneously true.  We could
-  // calculate them both in one pass if that proves important for
-  // performance.
-  if (!ADL) {
+  // Check whether this might be a C++ implicit instance member access.
+  // C++ [expr.prim.general]p6:
+  //   Within the definition of a non-static member function, an
+  //   identifier that names a non-static member is transformed to a
+  //   class member access expression.
+  // But note that &SomeClass::foo is grammatically distinct, even
+  // though we don't parse it that way.
+  if (!R.empty() && IsClassMember(*R.begin())) {
     bool isAbstractMemberPointer = (isAddressOfOperand && !SS.isEmpty());
 
-    if (!isAbstractMemberPointer && !R.empty() &&
-        isa<CXXRecordDecl>((*R.begin())->getDeclContext())) {
-      return BuildImplicitMemberReferenceExpr(SS, R, TemplateArgs);
+    if (!isAbstractMemberPointer) {
+      switch (ClassifyImplicitMemberAccess(*this, R)) {
+      case IMA_Instance:
+        return BuildImplicitMemberExpr(SS, R, TemplateArgs, true);
+
+      case IMA_AnonymousMember:
+        assert(R.isSingleResult());
+        return BuildAnonymousStructUnionMemberReference(R.getNameLoc(),
+                                                 R.getAsSingle<FieldDecl>());
+
+      case IMA_Mixed:
+      case IMA_Mixed_Unrelated:
+      case IMA_Unresolved:
+        return BuildImplicitMemberExpr(SS, R, TemplateArgs, false);
+
+      case IMA_Static:
+      case IMA_Mixed_StaticContext:
+      case IMA_Unresolved_StaticContext:
+        break;
+
+      case IMA_Error_StaticContext:
+      case IMA_Error_Unrelated:
+        DiagnoseInstanceReference(*this, SS, R);
+        return ExprError();
+      }
     }
   }
 
@@ -1027,7 +1242,7 @@ Sema::PerformObjectMemberConversion(Expr *&From, NamedDecl *Member) {
 
 /// \brief Build a MemberExpr AST node.
 static MemberExpr *BuildMemberExpr(ASTContext &C, Expr *Base, bool isArrow,
-                                   const CXXScopeSpec &SS, NamedDecl *Member,
+                                   const CXXScopeSpec &SS, ValueDecl *Member,
                                    SourceLocation Loc, QualType Ty,
                           const TemplateArgumentListInfo *TemplateArgs = 0) {
   NestedNameSpecifier *Qualifier = 0;
@@ -1041,35 +1256,15 @@ static MemberExpr *BuildMemberExpr(ASTContext &C, Expr *Base, bool isArrow,
                             Member, Loc, TemplateArgs, Ty);
 }
 
-/// Return true if all the decls in the given result are instance
-/// methods.
-static bool IsOnlyInstanceMethods(const LookupResult &R) {
-  for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
-    NamedDecl *D = (*I)->getUnderlyingDecl();
-
-    CXXMethodDecl *Method;
-    if (isa<FunctionTemplateDecl>(D))
-      Method = cast<CXXMethodDecl>(cast<FunctionTemplateDecl>(D)
-                                   ->getTemplatedDecl());
-    else if (isa<CXXMethodDecl>(D))
-      Method = cast<CXXMethodDecl>(D);
-    else
-      return false;
-
-    if (Method->isStatic())
-      return false;
-  }
-
-  return true;
-}
-
-/// Builds an implicit member access expression from the given
-/// unqualified lookup set, which is known to contain only class
-/// members.
+/// Builds an implicit member access expression.  The current context
+/// is known to be an instance method, and the given unqualified lookup
+/// set is known to contain only instance members, at least one of which
+/// is from an appropriate type.
 Sema::OwningExprResult
-Sema::BuildImplicitMemberReferenceExpr(const CXXScopeSpec &SS,
-                                       LookupResult &R,
-                              const TemplateArgumentListInfo *TemplateArgs) {
+Sema::BuildImplicitMemberExpr(const CXXScopeSpec &SS,
+                              LookupResult &R,
+                              const TemplateArgumentListInfo *TemplateArgs,
+                              bool IsKnownInstance) {
   assert(!R.empty() && !R.isAmbiguous());
 
   SourceLocation Loc = R.getNameLoc();
@@ -1082,44 +1277,18 @@ Sema::BuildImplicitMemberReferenceExpr(const CXXScopeSpec &SS,
     if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion())
       return BuildAnonymousStructUnionMemberReference(Loc, FD);
 
-  QualType ThisType;
-  if (isImplicitMemberReference(R, ThisType)) {
-    Expr *This = new (Context) CXXThisExpr(SourceLocation(), ThisType);
-    return BuildMemberReferenceExpr(ExprArg(*this, This),
-                                    /*OpLoc*/ SourceLocation(),
-                                    /*IsArrow*/ true,
-                                    SS, R, TemplateArgs);
-  }
-
-  // Diagnose now if none of the available methods are static.
-  if (IsOnlyInstanceMethods(R))
-    return ExprError(Diag(Loc, diag::err_member_call_without_object));
-
-  if (R.getAsSingle<FieldDecl>()) {
-    if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) {
-      if (MD->isStatic()) {
-        // "invalid use of member 'x' in static member function"
-        Diag(Loc, diag::err_invalid_member_use_in_static_method)
-          << R.getLookupName();
-        return ExprError();
-      }
-    }
-
-    // Any other ways we could have found the field in a well-formed
-    // program would have been turned into implicit member expressions
-    // above.
-    Diag(Loc, diag::err_invalid_non_static_member_use)
-      << R.getLookupName();
-    return ExprError();
+  // If this is known to be an instance access, go ahead and build a
+  // 'this' expression now.
+  QualType ThisType = cast<CXXMethodDecl>(CurContext)->getThisType(Context);
+  Expr *This = 0; // null signifies implicit access
+  if (IsKnownInstance) {
+    This = new (Context) CXXThisExpr(SourceLocation(), ThisType);
   }
 
-  // We're not in an implicit member-reference context, but the lookup
-  // results might not require an instance.  Try to build a non-member
-  // decl reference.
-  if (TemplateArgs)
-    return BuildTemplateIdExpr(SS, R, /* ADL */ false, *TemplateArgs);
-
-  return BuildDeclarationNameExpr(SS, R, /*ADL*/ false);
+  return BuildMemberReferenceExpr(ExprArg(*this, This), ThisType,
+                                  /*OpLoc*/ SourceLocation(),
+                                  /*IsArrow*/ true,
+                                  SS, R, TemplateArgs);
 }
 
 bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS,
@@ -1146,7 +1315,7 @@ bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS,
     //     -- a declaration of a class member
     // Since using decls preserve this property, we check this on the
     // original decl.
-    if (D->getDeclContext()->isRecord())
+    if (IsClassMember(D))
       return false;
 
     // C++0x [basic.lookup.argdep]p3:
@@ -1205,11 +1374,9 @@ Sema::OwningExprResult
 Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
                                LookupResult &R,
                                bool NeedsADL) {
-  assert(R.getResultKind() != LookupResult::FoundUnresolvedValue);
-
-  // If this isn't an overloaded result and we don't need ADL, just
-  // build an ordinary singleton decl ref.
-  if (!NeedsADL && !R.isOverloadedResult())
+  // If this is a single, fully-resolved result and we don't need ADL,
+  // just build an ordinary singleton decl ref.
+  if (!NeedsADL && R.isSingleResult())
     return BuildDeclarationNameExpr(SS, R.getNameLoc(), R.getFoundDecl());
 
   // We only need to check the declaration if there's exactly one
@@ -1246,7 +1413,23 @@ Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
   if (CheckDeclInExpr(*this, Loc, D))
     return ExprError();
 
-  ValueDecl *VD = cast<ValueDecl>(D);
+  if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) {
+    // Specifically diagnose references to class templates that are missing
+    // a template argument list.
+    Diag(Loc, diag::err_template_decl_ref)
+      << Template << SS.getRange();
+    Diag(Template->getLocation(), diag::note_template_decl_here);
+    return ExprError();
+  }
+
+  // Make sure that we're referring to a value.
+  ValueDecl *VD = dyn_cast<ValueDecl>(D);
+  if (!VD) {
+    Diag(Loc, diag::err_ref_non_value) 
+      << D << SS.getRange();
+    Diag(D->getLocation(), diag::note_previous_declaration);
+    return ExprError();
+  }
 
   // Check whether this declaration can be used. Note that we suppress
   // this check when we're going to perform argument-dependent lookup
@@ -1558,20 +1741,20 @@ bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc,
 
 /// \brief Build a sizeof or alignof expression given a type operand.
 Action::OwningExprResult
-Sema::CreateSizeOfAlignOfExpr(DeclaratorInfo *DInfo,
+Sema::CreateSizeOfAlignOfExpr(TypeSourceInfo *TInfo,
                               SourceLocation OpLoc,
                               bool isSizeOf, SourceRange R) {
-  if (!DInfo)
+  if (!TInfo)
     return ExprError();
 
-  QualType T = DInfo->getType();
+  QualType T = TInfo->getType();
 
   if (!T->isDependentType() &&
       CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf))
     return ExprError();
 
   // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
-  return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, DInfo,
+  return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, TInfo,
                                                Context.getSizeType(), OpLoc,
                                                R.getEnd()));
 }
@@ -1613,9 +1796,9 @@ Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType,
   if (TyOrEx == 0) return ExprError();
 
   if (isType) {
-    DeclaratorInfo *DInfo;
-    (void) GetTypeFromParser(TyOrEx, &DInfo);
-    return CreateSizeOfAlignOfExpr(DInfo, OpLoc, isSizeof, ArgRange);
+    TypeSourceInfo *TInfo;
+    (void) GetTypeFromParser(TyOrEx, &TInfo);
+    return CreateSizeOfAlignOfExpr(TInfo, OpLoc, isSizeof, ArgRange);
   }
 
   Expr *ArgEx = (Expr *)TyOrEx;
@@ -1952,7 +2135,8 @@ static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy,
 }
 
 Sema::OwningExprResult
-Sema::ActOnDependentMemberExpr(ExprArg Base, bool IsArrow, SourceLocation OpLoc,
+Sema::ActOnDependentMemberExpr(ExprArg Base, QualType BaseType,
+                               bool IsArrow, SourceLocation OpLoc,
                                const CXXScopeSpec &SS,
                                NamedDecl *FirstQualifierInScope,
                                DeclarationName Name, SourceLocation NameLoc,
@@ -1969,20 +2153,21 @@ Sema::ActOnDependentMemberExpr(ExprArg Base, bool IsArrow, SourceLocation OpLoc,
   // accessing the 'f' property if T is an Obj-C interface. The extra check
   // allows this, while still reporting an error if T is a struct pointer.
   if (!IsArrow) {
-    const PointerType *PT = BaseExpr->getType()->getAs<PointerType>();
+    const PointerType *PT = BaseType->getAs<PointerType>();
     if (PT && (!getLangOptions().ObjC1 ||
                PT->getPointeeType()->isRecordType())) {
+      assert(BaseExpr && "cannot happen with implicit member accesses");
       Diag(NameLoc, diag::err_typecheck_member_reference_struct_union)
-        << BaseExpr->getType() << BaseExpr->getSourceRange();
+        << BaseType << BaseExpr->getSourceRange();
       return ExprError();
     }
   }
 
-  assert(BaseExpr->getType()->isDependentType());
+  assert(BaseType->isDependentType());
 
   // Get the type being accessed in BaseType.  If this is an arrow, the BaseExpr
   // must have pointer type, and the accessed type is the pointee.
-  return Owned(CXXDependentScopeMemberExpr::Create(Context, BaseExpr,
+  return Owned(CXXDependentScopeMemberExpr::Create(Context, BaseExpr, BaseType,
                                                    IsArrow, OpLoc,
                  static_cast<NestedNameSpecifier*>(SS.getScopeRep()),
                                                    SS.getRange(),
@@ -1997,15 +2182,18 @@ Sema::ActOnDependentMemberExpr(ExprArg Base, bool IsArrow, SourceLocation OpLoc,
 static void DiagnoseQualifiedMemberReference(Sema &SemaRef,
                                              Expr *BaseExpr,
                                              QualType BaseType,
-                                             NestedNameSpecifier *Qualifier,
-                                             SourceRange QualifierRange,
+                                             const CXXScopeSpec &SS,
                                              const LookupResult &R) {
-  DeclContext *DC = R.getRepresentativeDecl()->getDeclContext();
+  // If this is an implicit member access, use a different set of
+  // diagnostics.
+  if (!BaseExpr)
+    return DiagnoseInstanceReference(SemaRef, SS, R);
 
   // FIXME: this is an exceedingly lame diagnostic for some of the more
   // complicated cases here.
+  DeclContext *DC = R.getRepresentativeDecl()->getDeclContext();
   SemaRef.Diag(R.getNameLoc(), diag::err_not_direct_base_or_virtual)
-    << QualifierRange << DC << BaseType;
+    << SS.getRange() << DC << BaseType;
 }
 
 // Check whether the declarations we found through a nested-name
@@ -2022,37 +2210,78 @@ static void DiagnoseQualifiedMemberReference(Sema &SemaRef,
 // we actually pick through overload resolution is from a superclass.
 bool Sema::CheckQualifiedMemberReference(Expr *BaseExpr,
                                          QualType BaseType,
-                                         NestedNameSpecifier *Qualifier,
-                                         SourceRange QualifierRange,
+                                         const CXXScopeSpec &SS,
                                          const LookupResult &R) {
-  QualType BaseTypeCanon
-    = Context.getCanonicalType(BaseType).getUnqualifiedType();
-
-  bool FoundValid = false;
+  const RecordType *BaseRT = BaseType->getAs<RecordType>();
+  if (!BaseRT) {
+    // We can't check this yet because the base type is still
+    // dependent.
+    assert(BaseType->isDependentType());
+    return false;
+  }
+  CXXRecordDecl *BaseRecord = cast<CXXRecordDecl>(BaseRT->getDecl());
 
   for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
-    TypeDecl* TyD = cast<TypeDecl>((*I)->getUnderlyingDecl()->getDeclContext());
-    CanQualType MemberTypeCanon
-      = Context.getCanonicalType(Context.getTypeDeclType(TyD));
+    // If this is an implicit member reference and we find a
+    // non-instance member, it's not an error.
+    if (!BaseExpr && !IsInstanceMember((*I)->getUnderlyingDecl()))
+      return false;
 
-    if (BaseTypeCanon == MemberTypeCanon ||
-        IsDerivedFrom(BaseTypeCanon, MemberTypeCanon)) {
-      FoundValid = true;
-      break;
-    }
+    // Note that we use the DC of the decl, not the underlying decl.
+    CXXRecordDecl *RecordD = cast<CXXRecordDecl>((*I)->getDeclContext());
+    while (RecordD->isAnonymousStructOrUnion())
+      RecordD = cast<CXXRecordDecl>(RecordD->getParent());
+
+    llvm::SmallPtrSet<CXXRecordDecl*,4> MemberRecord;
+    MemberRecord.insert(RecordD->getCanonicalDecl());
+
+    if (!IsProvablyNotDerivedFrom(*this, BaseRecord, MemberRecord))
+      return false;
   }
 
-  if (!FoundValid) {
-    DiagnoseQualifiedMemberReference(*this, BaseExpr, BaseType,
-                                     Qualifier, QualifierRange, R);
+  DiagnoseQualifiedMemberReference(*this, BaseExpr, BaseType, SS, R);
+  return true;
+}
+
+static bool
+LookupMemberExprInRecord(Sema &SemaRef, LookupResult &R,
+                         SourceRange BaseRange, const RecordType *RTy,
+                         SourceLocation OpLoc, const CXXScopeSpec &SS) {
+  RecordDecl *RDecl = RTy->getDecl();
+  if (SemaRef.RequireCompleteType(OpLoc, QualType(RTy, 0),
+                                  PDiag(diag::err_typecheck_incomplete_tag)
+                                    << BaseRange))
     return true;
+
+  DeclContext *DC = RDecl;
+  if (SS.isSet()) {
+    // If the member name was a qualified-id, look into the
+    // nested-name-specifier.
+    DC = SemaRef.computeDeclContext(SS, false);
+
+    if (SemaRef.RequireCompleteDeclContext(SS)) {
+      SemaRef.Diag(SS.getRange().getEnd(), diag::err_typecheck_incomplete_tag)
+        << SS.getRange() << DC;
+      return true;
+    }
+
+    assert(DC && "Cannot handle non-computable dependent contexts in lookup");
+      
+    if (!isa<TypeDecl>(DC)) {
+      SemaRef.Diag(R.getNameLoc(), diag::err_qualified_member_nonclass)
+        << DC << SS.getRange();
+      return true;
+    }
   }
 
+  // The record definition is complete, now look up the member.
+  SemaRef.LookupQualifiedName(R, DC);
+
   return false;
 }
 
 Sema::OwningExprResult
-Sema::BuildMemberReferenceExpr(ExprArg BaseArg,
+Sema::BuildMemberReferenceExpr(ExprArg BaseArg, QualType BaseType,
                                SourceLocation OpLoc, bool IsArrow,
                                const CXXScopeSpec &SS,
                                NamedDecl *FirstQualifierInScope,
@@ -2060,38 +2289,53 @@ Sema::BuildMemberReferenceExpr(ExprArg BaseArg,
                                const TemplateArgumentListInfo *TemplateArgs) {
   Expr *Base = BaseArg.takeAs<Expr>();
 
-  if (Base->getType()->isDependentType())
-    return ActOnDependentMemberExpr(ExprArg(*this, Base),
+  if (BaseType->isDependentType() ||
+      (SS.isSet() && isDependentScopeSpecifier(SS)))
+    return ActOnDependentMemberExpr(ExprArg(*this, Base), BaseType,
                                     IsArrow, OpLoc,
                                     SS, FirstQualifierInScope,
                                     Name, NameLoc,
                                     TemplateArgs);
 
   LookupResult R(*this, Name, NameLoc, LookupMemberName);
-  OwningExprResult Result =
-    LookupMemberExpr(R, Base, IsArrow, OpLoc,
-                     SS, FirstQualifierInScope,
-                     /*ObjCImpDecl*/ DeclPtrTy());
 
-  if (Result.isInvalid()) {
-    Owned(Base);
-    return ExprError();
-  }
+  // Implicit member accesses.
+  if (!Base) {
+    QualType RecordTy = BaseType;
+    if (IsArrow) RecordTy = RecordTy->getAs<PointerType>()->getPointeeType();
+    if (LookupMemberExprInRecord(*this, R, SourceRange(),
+                                 RecordTy->getAs<RecordType>(),
+                                 OpLoc, SS))
+      return ExprError();
+
+  // Explicit member accesses.
+  } else {
+    OwningExprResult Result =
+      LookupMemberExpr(R, Base, IsArrow, OpLoc,
+                       SS, FirstQualifierInScope,
+                       /*ObjCImpDecl*/ DeclPtrTy());
 
-  if (Result.get())
-    return move(Result);
+    if (Result.isInvalid()) {
+      Owned(Base);
+      return ExprError();
+    }
+
+    if (Result.get())
+      return move(Result);
+  }
 
-  return BuildMemberReferenceExpr(ExprArg(*this, Base), OpLoc,
-                                  IsArrow, SS, R, TemplateArgs);
+  return BuildMemberReferenceExpr(ExprArg(*this, Base), BaseType,
+                                  OpLoc, IsArrow, SS, R, TemplateArgs);
 }
 
 Sema::OwningExprResult
-Sema::BuildMemberReferenceExpr(ExprArg Base, SourceLocation OpLoc,
-                               bool IsArrow, const CXXScopeSpec &SS,
+Sema::BuildMemberReferenceExpr(ExprArg Base, QualType BaseExprType,
+                               SourceLocation OpLoc, bool IsArrow,
+                               const CXXScopeSpec &SS,
                                LookupResult &R,
                          const TemplateArgumentListInfo *TemplateArgs) {
   Expr *BaseExpr = Base.takeAs<Expr>();
-  QualType BaseType = BaseExpr->getType();
+  QualType BaseType = BaseExprType;
   if (IsArrow) {
     assert(BaseType->isPointerType());
     BaseType = BaseType->getAs<PointerType>()->getPointeeType();
@@ -2112,29 +2356,30 @@ Sema::BuildMemberReferenceExpr(ExprArg Base, SourceLocation OpLoc,
                        : BaseType->getAs<RecordType>()->getDecl());
 
     Diag(R.getNameLoc(), diag::err_no_member)
-      << MemberName << DC << BaseExpr->getSourceRange();
+      << MemberName << DC
+      << (BaseExpr ? BaseExpr->getSourceRange() : SourceRange());
     return ExprError();
   }
 
-  // We can't always diagnose the problem yet: it's permitted for
-  // lookup to find things from an invalid context as long as they
-  // don't get picked by overload resolution.
-  if (SS.isSet() && CheckQualifiedMemberReference(BaseExpr, BaseType,
-                                                  Qualifier, SS.getRange(), R))
+  // Diagnose qualified lookups that find only declarations from a
+  // non-base type.  Note that it's okay for lookup to find
+  // declarations from a non-base type as long as those aren't the
+  // ones picked by overload resolution.
+  if (SS.isSet() && CheckQualifiedMemberReference(BaseExpr, BaseType, SS, R))
     return ExprError();
 
   // Construct an unresolved result if we in fact got an unresolved
   // result.
   if (R.isOverloadedResult() || R.isUnresolvableResult()) {
-    bool Dependent = R.isUnresolvableResult();
-    Dependent = Dependent ||
-                UnresolvedLookupExpr::ComputeDependence(R.begin(), R.end(),
-                                                        TemplateArgs);
+    bool Dependent =
+      R.isUnresolvableResult() ||
+      UnresolvedLookupExpr::ComputeDependence(R.begin(), R.end(), TemplateArgs);
 
     UnresolvedMemberExpr *MemExpr
       = UnresolvedMemberExpr::Create(Context, Dependent,
                                      R.isUnresolvableResult(),
-                                     BaseExpr, IsArrow, OpLoc,
+                                     BaseExpr, BaseExprType,
+                                     IsArrow, OpLoc,
                                      Qualifier, SS.getRange(),
                                      MemberName, MemberLoc,
                                      TemplateArgs);
@@ -2155,6 +2400,15 @@ Sema::BuildMemberReferenceExpr(ExprArg Base, SourceLocation OpLoc,
   if (MemberDecl->isInvalidDecl())
     return ExprError();
 
+  // Handle the implicit-member-access case.
+  if (!BaseExpr) {
+    // If this is not an instance member, convert to a non-member access.
+    if (!IsInstanceMember(MemberDecl))
+      return BuildDeclarationNameExpr(SS, R.getNameLoc(), MemberDecl);
+
+    BaseExpr = new (Context) CXXThisExpr(SourceLocation(), BaseExprType);
+  }
+
   bool ShouldCheckUse = true;
   if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MemberDecl)) {
     // Don't diagnose the use of a virtual member function unless it's
@@ -2172,7 +2426,8 @@ Sema::BuildMemberReferenceExpr(ExprArg Base, SourceLocation OpLoc,
   if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) {
     // We may have found a field within an anonymous union or struct
     // (C++ [class.union]).
-    if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion())
+    if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion() &&
+        !BaseType->getAs<RecordType>()->getDecl()->isAnonymousStructOrUnion())
       return BuildAnonymousStructUnionMemberReference(MemberLoc, FD,
                                                       BaseExpr, OpLoc);
 
@@ -2246,7 +2501,7 @@ Sema::BuildMemberReferenceExpr(ExprArg Base, SourceLocation OpLoc,
 /// fixed for ObjC++.
 Sema::OwningExprResult
 Sema::LookupMemberExpr(LookupResult &R, Expr *&BaseExpr,
-                       bool IsArrow, SourceLocation OpLoc,
+                       bool &IsArrow, SourceLocation OpLoc,
                        const CXXScopeSpec &SS,
                        NamedDecl *FirstQualifierInScope,
                        DeclPtrTy ObjCImpDecl) {
@@ -2295,6 +2550,16 @@ Sema::LookupMemberExpr(LookupResult &R, Expr *&BaseExpr,
   // If this is an Objective-C pseudo-builtin and a definition is provided then
   // use that.
   if (BaseType->isObjCIdType()) {
+    if (IsArrow) {
+      // Handle the following exceptional case PObj->isa.
+      if (const ObjCObjectPointerType *OPT =
+          BaseType->getAs<ObjCObjectPointerType>()) {
+        if (OPT->getPointeeType()->isSpecificBuiltinType(BuiltinType::ObjCId) &&
+            MemberName.getAsIdentifierInfo()->isStr("isa"))
+          return Owned(new (Context) ObjCIsaExpr(BaseExpr, true, MemberLoc,
+                                                 Context.getObjCClassType()));
+      }
+    }
     // We have an 'id' type. Rather than fall through, we check if this
     // is a reference to 'isa'.
     if (BaseType != Context.ObjCIdRedefinitionType) {
@@ -2377,41 +2642,48 @@ Sema::LookupMemberExpr(LookupResult &R, Expr *&BaseExpr,
       BaseType = PT->getPointeeType();
     else if (BaseType->isObjCObjectPointerType())
       ;
-    else {
+    else if (BaseType->isRecordType()) {
+      // Recover from arrow accesses to records, e.g.:
+      //   struct MyRecord foo;
+      //   foo->bar
+      // This is actually well-formed in C++ if MyRecord has an
+      // overloaded operator->, but that should have been dealt with
+      // by now.
+      Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
+        << BaseType << int(IsArrow) << BaseExpr->getSourceRange()
+        << CodeModificationHint::CreateReplacement(OpLoc, ".");
+      IsArrow = false;
+    } else {
       Diag(MemberLoc, diag::err_typecheck_member_reference_arrow)
         << BaseType << BaseExpr->getSourceRange();
       return ExprError();
     }
+  } else {
+    // Recover from dot accesses to pointers, e.g.:
+    //   type *foo;
+    //   foo.bar
+    // This is actually well-formed in two cases:
+    //   - 'type' is an Objective C type
+    //   - 'bar' is a pseudo-destructor name which happens to refer to
+    //     the appropriate pointer type
+    if (MemberName.getNameKind() != DeclarationName::CXXDestructorName) {
+      const PointerType *PT = BaseType->getAs<PointerType>();
+      if (PT && PT->getPointeeType()->isRecordType()) {
+        Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
+          << BaseType << int(IsArrow) << BaseExpr->getSourceRange()
+          << CodeModificationHint::CreateReplacement(OpLoc, "->");
+        BaseType = PT->getPointeeType();
+        IsArrow = true;
+      }
+    }
   }
-
+  
   // Handle field access to simple records.  This also handles access
   // to fields of the ObjC 'id' struct.
   if (const RecordType *RTy = BaseType->getAs<RecordType>()) {
-    RecordDecl *RDecl = RTy->getDecl();
-    if (RequireCompleteType(OpLoc, BaseType,
-                            PDiag(diag::err_typecheck_incomplete_tag)
-                              << BaseExpr->getSourceRange()))
+    if (LookupMemberExprInRecord(*this, R, BaseExpr->getSourceRange(),
+                                 RTy, OpLoc, SS))
       return ExprError();
-
-    DeclContext *DC = RDecl;
-    if (SS.isSet()) {
-      // If the member name was a qualified-id, look into the
-      // nested-name-specifier.
-      DC = computeDeclContext(SS, false);
-      
-      if (!isa<TypeDecl>(DC)) {
-        Diag(MemberLoc, diag::err_qualified_member_nonclass)
-          << DC << SS.getRange();
-        return ExprError();
-      }
-
-      // FIXME: If DC is not computable, we should build a
-      // CXXDependentScopeMemberExpr.
-      assert(DC && "Cannot handle non-computable dependent contexts in lookup");
-    }
-
-    // The record definition is complete, now make sure the member is valid.
-    LookupQualifiedName(R, DC);
     return Owned((Expr*) 0);
   }
 
@@ -2644,7 +2916,7 @@ Sema::LookupMemberExpr(LookupResult &R, Expr *&BaseExpr,
       BaseType->isSpecificBuiltinType(BuiltinType::ObjCId) &&
       MemberName.getAsIdentifierInfo()->isStr("isa"))
     return Owned(new (Context) ObjCIsaExpr(BaseExpr, false, MemberLoc,
-                                           Context.getObjCIdType()));
+                                           Context.getObjCClassType()));
 
   // Handle 'field access' to vectors, such as 'V.xx'.
   if (BaseType->isExtVectorType()) {
@@ -2723,7 +2995,7 @@ Sema::OwningExprResult Sema::ActOnMemberAccessExpr(Scope *S, ExprArg BaseArg,
   Expr *Base = BaseArg.takeAs<Expr>();
   OwningExprResult Result(*this);
   if (Base->getType()->isDependentType()) {
-    Result = ActOnDependentMemberExpr(ExprArg(*this, Base),
+    Result = ActOnDependentMemberExpr(ExprArg(*this, Base), Base->getType(),
                                       IsArrow, OpLoc,
                                       SS, FirstQualifierInScope,
                                       Name, NameLoc,
@@ -2756,8 +3028,8 @@ Sema::OwningExprResult Sema::ActOnMemberAccessExpr(Scope *S, ExprArg BaseArg,
       }
     }
 
-    Result = BuildMemberReferenceExpr(ExprArg(*this, Base), OpLoc,
-                                      IsArrow, SS, R, TemplateArgs);
+    Result = BuildMemberReferenceExpr(ExprArg(*this, Base), Base->getType(),
+                                      OpLoc, IsArrow, SS, R, TemplateArgs);
   }
 
   return move(Result);
@@ -3054,16 +3326,16 @@ Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc,
              isa<FunctionTemplateDecl>(*MemE->decls_begin()));
       (void)MemE;
 
-      return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
-                                             CommaLocs, RParenLoc));
+      return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
+                                       CommaLocs, RParenLoc);
     }
 
     // Determine whether this is a call to a member function.
     if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(NakedFn)) {
       NamedDecl *MemDecl = MemExpr->getMemberDecl();
       if (isa<CXXMethodDecl>(MemDecl))
-        return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
-                                               CommaLocs, RParenLoc));
+        return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
+                                         CommaLocs, RParenLoc);
     }
     
     // Determine whether this is a call to a pointer-to-member function.
@@ -3155,13 +3427,28 @@ Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc,
   } else {
     assert(Fns.size() <= 1 && "overloaded without Overloaded flag");
     if (Fns.empty())
-      NDecl = FDecl = 0;
+      NDecl = 0;
     else {
       NDecl = Fns[0];
-      FDecl = dyn_cast<FunctionDecl>(NDecl);
     }
   }
 
+  return BuildResolvedCallExpr(Fn, NDecl, LParenLoc, Args, NumArgs, RParenLoc);
+}
+
+/// BuildCallExpr - Build a call to a resolved expression, i.e. an
+/// expression not of \p OverloadTy.  The expression should
+/// unary-convert to an expression of function-pointer or
+/// block-pointer type.
+///
+/// \param NDecl the declaration being called, if available
+Sema::OwningExprResult
+Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
+                            SourceLocation LParenLoc,
+                            Expr **Args, unsigned NumArgs,
+                            SourceLocation RParenLoc) {
+  FunctionDecl *FDecl = dyn_cast_or_null<FunctionDecl>(NDecl);
+
   // Promote the function operand.
   UsualUnaryConversions(Fn);
 
@@ -3661,41 +3948,14 @@ QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS,
     ImpCastExprToType(LHS, RHSTy, CastExpr::CK_Unknown);
     return RHSTy;
   }
-  // Handle things like Class and struct objc_class*.  Here we case the result
-  // to the pseudo-builtin, because that will be implicitly cast back to the
-  // redefinition type if an attempt is made to access its fields.
-  if (LHSTy->isObjCClassType() &&
-      (RHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) {
-    ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast);
-    return LHSTy;
-  }
-  if (RHSTy->isObjCClassType() &&
-      (LHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) {
-    ImpCastExprToType(LHS, RHSTy, CastExpr::CK_BitCast);
-    return RHSTy;
-  }
-  // And the same for struct objc_object* / id
-  if (LHSTy->isObjCIdType() &&
-      (RHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) {
-    ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast);
-    return LHSTy;
-  }
-  if (RHSTy->isObjCIdType() &&
-      (LHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) {
-    ImpCastExprToType(LHS, RHSTy, CastExpr::CK_BitCast);
-    return RHSTy;
-  }
-  // And the same for struct objc_selector* / SEL
-  if (Context.isObjCSelType(LHSTy) &&
-      (RHSTy.getDesugaredType() == Context.ObjCSelRedefinitionType)) {
-    ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast);
-    return LHSTy;
-  }
-  if (Context.isObjCSelType(RHSTy) &&
-      (LHSTy.getDesugaredType() == Context.ObjCSelRedefinitionType)) {
-    ImpCastExprToType(LHS, RHSTy, CastExpr::CK_BitCast);
-    return RHSTy;
-  }
+  
+  // All objective-c pointer type analysis is done here.
+  QualType compositeType = FindCompositeObjCPointerType(LHS, RHS,
+                                                        QuestionLoc);
+  if (!compositeType.isNull())
+    return compositeType;
+  
+  
   // Handle block pointer types.
   if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) {
     if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) {
@@ -3706,7 +3966,7 @@ QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS,
         return destType;
       }
       Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
-            << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
+      << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
       return QualType();
     }
     // We have 2 block pointer types.
@@ -3717,11 +3977,11 @@ QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS,
     // The block pointer types aren't identical, continue checking.
     QualType lhptee = LHSTy->getAs<BlockPointerType>()->getPointeeType();
     QualType rhptee = RHSTy->getAs<BlockPointerType>()->getPointeeType();
-
+    
     if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(),
                                     rhptee.getUnqualifiedType())) {
       Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers)
-        << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
+      << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
       // In this situation, we assume void* type. No especially good
       // reason, but this is what gcc does, and we do have to pick
       // to get a consistent AST.
@@ -3735,86 +3995,7 @@ QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS,
     ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast);
     return LHSTy;
   }
-  // Check constraints for Objective-C object pointers types.
-  if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) {
-
-    if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
-      // Two identical object pointer types are always compatible.
-      return LHSTy;
-    }
-    const ObjCObjectPointerType *LHSOPT = LHSTy->getAs<ObjCObjectPointerType>();
-    const ObjCObjectPointerType *RHSOPT = RHSTy->getAs<ObjCObjectPointerType>();
-    QualType compositeType = LHSTy;
-
-    // If both operands are interfaces and either operand can be
-    // assigned to the other, use that type as the composite
-    // type. This allows
-    //   xxx ? (A*) a : (B*) b
-    // where B is a subclass of A.
-    //
-    // Additionally, as for assignment, if either type is 'id'
-    // allow silent coercion. Finally, if the types are
-    // incompatible then make sure to use 'id' as the composite
-    // type so the result is acceptable for sending messages to.
-
-    // FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
-    // It could return the composite type.
-    if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) {
-      compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy;
-    } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) {
-      compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy;
-    } else if ((LHSTy->isObjCQualifiedIdType() ||
-                RHSTy->isObjCQualifiedIdType()) &&
-                Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) {
-      // Need to handle "id<xx>" explicitly.
-      // GCC allows qualified id and any Objective-C type to devolve to
-      // id. Currently localizing to here until clear this should be
-      // part of ObjCQualifiedIdTypesAreCompatible.
-      compositeType = Context.getObjCIdType();
-    } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) {
-      compositeType = Context.getObjCIdType();
-    } else if (!(compositeType = 
-                 Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull())
-      ;
-    else {
-      Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
-        << LHSTy << RHSTy
-        << LHS->getSourceRange() << RHS->getSourceRange();
-      QualType incompatTy = Context.getObjCIdType();
-      ImpCastExprToType(LHS, incompatTy, CastExpr::CK_BitCast);
-      ImpCastExprToType(RHS, incompatTy, CastExpr::CK_BitCast);
-      return incompatTy;
-    }
-    // The object pointer types are compatible.
-    ImpCastExprToType(LHS, compositeType, CastExpr::CK_BitCast);
-    ImpCastExprToType(RHS, compositeType, CastExpr::CK_BitCast);
-    return compositeType;
-  }
-  // Check Objective-C object pointer types and 'void *'
-  if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) {
-    QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
-    QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
-    QualType destPointee
-      = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
-    QualType destType = Context.getPointerType(destPointee);
-    // Add qualifiers if necessary.
-    ImpCastExprToType(LHS, destType, CastExpr::CK_NoOp);
-    // Promote to void*.
-    ImpCastExprToType(RHS, destType, CastExpr::CK_BitCast);
-    return destType;
-  }
-  if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) {
-    QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
-    QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
-    QualType destPointee
-      = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
-    QualType destType = Context.getPointerType(destPointee);
-    // Add qualifiers if necessary.
-    ImpCastExprToType(RHS, destType, CastExpr::CK_NoOp);
-    // Promote to void*.
-    ImpCastExprToType(LHS, destType, CastExpr::CK_BitCast);
-    return destType;
-  }
+  
   // Check constraints for C object pointers types (C99 6.5.15p3,6).
   if (LHSTy->isPointerType() && RHSTy->isPointerType()) {
     // get the "pointed to" types
@@ -3892,6 +4073,131 @@ QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS,
   return QualType();
 }
 
+/// FindCompositeObjCPointerType - Helper method to find composite type of
+/// two objective-c pointer types of the two input expressions.
+QualType Sema::FindCompositeObjCPointerType(Expr *&LHS, Expr *&RHS,
+                                        SourceLocation QuestionLoc) {
+  QualType LHSTy = LHS->getType();
+  QualType RHSTy = RHS->getType();
+  
+  // Handle things like Class and struct objc_class*.  Here we case the result
+  // to the pseudo-builtin, because that will be implicitly cast back to the
+  // redefinition type if an attempt is made to access its fields.
+  if (LHSTy->isObjCClassType() &&
+      (RHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) {
+    ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast);
+    return LHSTy;
+  }
+  if (RHSTy->isObjCClassType() &&
+      (LHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) {
+    ImpCastExprToType(LHS, RHSTy, CastExpr::CK_BitCast);
+    return RHSTy;
+  }
+  // And the same for struct objc_object* / id
+  if (LHSTy->isObjCIdType() &&
+      (RHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) {
+    ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast);
+    return LHSTy;
+  }
+  if (RHSTy->isObjCIdType() &&
+      (LHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) {
+    ImpCastExprToType(LHS, RHSTy, CastExpr::CK_BitCast);
+    return RHSTy;
+  }
+  // And the same for struct objc_selector* / SEL
+  if (Context.isObjCSelType(LHSTy) &&
+      (RHSTy.getDesugaredType() == Context.ObjCSelRedefinitionType)) {
+    ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast);
+    return LHSTy;
+  }
+  if (Context.isObjCSelType(RHSTy) &&
+      (LHSTy.getDesugaredType() == Context.ObjCSelRedefinitionType)) {
+    ImpCastExprToType(LHS, RHSTy, CastExpr::CK_BitCast);
+    return RHSTy;
+  }
+  // Check constraints for Objective-C object pointers types.
+  if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) {
+    
+    if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
+      // Two identical object pointer types are always compatible.
+      return LHSTy;
+    }
+    const ObjCObjectPointerType *LHSOPT = LHSTy->getAs<ObjCObjectPointerType>();
+    const ObjCObjectPointerType *RHSOPT = RHSTy->getAs<ObjCObjectPointerType>();
+    QualType compositeType = LHSTy;
+    
+    // If both operands are interfaces and either operand can be
+    // assigned to the other, use that type as the composite
+    // type. This allows
+    //   xxx ? (A*) a : (B*) b
+    // where B is a subclass of A.
+    //
+    // Additionally, as for assignment, if either type is 'id'
+    // allow silent coercion. Finally, if the types are
+    // incompatible then make sure to use 'id' as the composite
+    // type so the result is acceptable for sending messages to.
+    
+    // FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
+    // It could return the composite type.
+    if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) {
+      compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy;
+    } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) {
+      compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy;
+    } else if ((LHSTy->isObjCQualifiedIdType() ||
+                RHSTy->isObjCQualifiedIdType()) &&
+               Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) {
+      // Need to handle "id<xx>" explicitly.
+      // GCC allows qualified id and any Objective-C type to devolve to
+      // id. Currently localizing to here until clear this should be
+      // part of ObjCQualifiedIdTypesAreCompatible.
+      compositeType = Context.getObjCIdType();
+    } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) {
+      compositeType = Context.getObjCIdType();
+    } else if (!(compositeType = 
+                 Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull())
+      ;
+    else {
+      Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
+      << LHSTy << RHSTy
+      << LHS->getSourceRange() << RHS->getSourceRange();
+      QualType incompatTy = Context.getObjCIdType();
+      ImpCastExprToType(LHS, incompatTy, CastExpr::CK_BitCast);
+      ImpCastExprToType(RHS, incompatTy, CastExpr::CK_BitCast);
+      return incompatTy;
+    }
+    // The object pointer types are compatible.
+    ImpCastExprToType(LHS, compositeType, CastExpr::CK_BitCast);
+    ImpCastExprToType(RHS, compositeType, CastExpr::CK_BitCast);
+    return compositeType;
+  }
+  // Check Objective-C object pointer types and 'void *'
+  if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) {
+    QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
+    QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
+    QualType destPointee
+    = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
+    QualType destType = Context.getPointerType(destPointee);
+    // Add qualifiers if necessary.
+    ImpCastExprToType(LHS, destType, CastExpr::CK_NoOp);
+    // Promote to void*.
+    ImpCastExprToType(RHS, destType, CastExpr::CK_BitCast);
+    return destType;
+  }
+  if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) {
+    QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
+    QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
+    QualType destPointee
+    = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
+    QualType destType = Context.getPointerType(destPointee);
+    // Add qualifiers if necessary.
+    ImpCastExprToType(RHS, destType, CastExpr::CK_NoOp);
+    // Promote to void*.
+    ImpCastExprToType(LHS, destType, CastExpr::CK_BitCast);
+    return destType;
+  }
+  return QualType();
+}
+
 /// ActOnConditionalOp - Parse a ?: operation.  Note that 'LHS' may be null
 /// in the case of a the GNU conditional expr extension.
 Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc,
@@ -4051,6 +4357,29 @@ Sema::CheckBlockPointerTypesForAssignment(QualType lhsType,
   return ConvTy;
 }
 
+/// CheckObjCPointerTypesForAssignment - Compares two objective-c pointer types
+/// for assignment compatibility.
+Sema::AssignConvertType
+Sema::CheckObjCPointerTypesForAssignment(QualType lhsType, QualType rhsType) {
+  if (lhsType->isObjCBuiltinType() || rhsType->isObjCBuiltinType())
+    return Compatible;
+  QualType lhptee = 
+  lhsType->getAs<ObjCObjectPointerType>()->getPointeeType();
+  QualType rhptee = 
+  rhsType->getAs<ObjCObjectPointerType>()->getPointeeType();
+  // make sure we operate on the canonical type
+  lhptee = Context.getCanonicalType(lhptee);
+  rhptee = Context.getCanonicalType(rhptee);
+  if (!lhptee.isAtLeastAsQualifiedAs(rhptee))
+    return CompatiblePointerDiscardsQualifiers;
+  
+  if (Context.typesAreCompatible(lhsType, rhsType))
+    return Compatible;
+  if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType())
+    return IncompatibleObjCQualifiedId;
+  return IncompatiblePointer;  
+}
+
 /// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
 /// has code to accommodate several GCC extensions when type checking
 /// pointers. Here are some objectionable examples that GCC considers warnings:
@@ -4173,13 +4502,7 @@ Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) {
       return IncompatiblePointer;
     }
     if (rhsType->isObjCObjectPointerType()) {
-      if (lhsType->isObjCBuiltinType() || rhsType->isObjCBuiltinType())
-        return Compatible;
-      if (Context.typesAreCompatible(lhsType, rhsType))
-        return Compatible;
-      if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType())
-        return IncompatibleObjCQualifiedId;
-      return IncompatiblePointer;
+      return CheckObjCPointerTypesForAssignment(lhsType, rhsType);
     }
     if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) {
       if (RHSPT->getPointeeType()->isVoidType())
@@ -4794,6 +5117,7 @@ QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc,
                                     unsigned OpaqueOpc, bool isRelational) {
   BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc;
 
+  // Handle vector comparisons separately.
   if (lex->getType()->isVectorType() || rex->getType()->isVectorType())
     return CheckVectorCompareOperands(lex, rex, Loc, isRelational);
 
@@ -4871,17 +5195,15 @@ QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc,
   }
 
   // The result of comparisons is 'bool' in C++, 'int' in C.
-  QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy;
+  QualType ResultTy = getLangOptions().CPlusPlus ? Context.BoolTy:Context.IntTy;
 
   if (isRelational) {
     if (lType->isRealType() && rType->isRealType())
       return ResultTy;
   } else {
     // Check for comparisons of floating point operands using != and ==.
-    if (lType->isFloatingType()) {
-      assert(rType->isFloatingType());
+    if (lType->isFloatingType() && rType->isFloatingType())
       CheckFloatComparison(Loc,lex,rex);
-    }
 
     if (lType->isArithmeticType() && rType->isArithmeticType())
       return ResultTy;
@@ -6157,18 +6479,33 @@ Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
       RecordDecl *RD = RC->getDecl();
       if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
         if (!CRD->isPOD() && !DidWarnAboutNonPOD) {
-          ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type)
-            << SourceRange(CompPtr[0].LocStart, OC.LocEnd)
-            << Res->getType());
-          DidWarnAboutNonPOD = true;
+          switch (ExprEvalContexts.back().Context ) {
+          case Unevaluated:
+            // The argument will never be evaluated, so don't complain.
+            break;
+            
+          case PotentiallyEvaluated:
+            ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type)
+                      << SourceRange(CompPtr[0].LocStart, OC.LocEnd)
+                      << Res->getType());
+            DidWarnAboutNonPOD = true;
+            break;
+            
+          case PotentiallyPotentiallyEvaluated:
+            ExprEvalContexts.back().addDiagnostic(BuiltinLoc,
+                              PDiag(diag::warn_offsetof_non_pod_type)
+                                << SourceRange(CompPtr[0].LocStart, OC.LocEnd)
+                                << Res->getType());
+            DidWarnAboutNonPOD = true;
+            break;
+          }
         }
       }
 
       LookupResult R(*this, OC.U.IdentInfo, OC.LocStart, LookupMemberName);
       LookupQualifiedName(R, RD);
 
-      FieldDecl *MemberDecl
-        = dyn_cast_or_null<FieldDecl>(R.getAsSingleDecl(Context));
+      FieldDecl *MemberDecl = R.getAsSingle<FieldDecl>();
       // FIXME: Leaks Res
       if (!MemberDecl)
         return ExprError(Diag(BuiltinLoc, diag::err_no_member)
@@ -6180,6 +6517,7 @@ Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
         Res = BuildAnonymousStructUnionMemberReference(
             OC.LocEnd, MemberDecl, Res, OC.LocEnd).takeAs<Expr>();
       } else {
+        PerformObjectMemberConversion(Res, MemberDecl);
         // MemberDecl->getType() doesn't get the right qualifiers, but it
         // doesn't matter here.
         Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd,
@@ -6270,6 +6608,7 @@ void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) {
   CurFunctionNeedsScopeChecking = false;
 
   BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc);
+  CurContext->addDecl(BSI->TheDecl);
   PushDeclContext(BlockScope, BSI->TheDecl);
 }
 
@@ -6625,16 +6964,26 @@ Sema::PopExpressionEvaluationContext() {
   ExpressionEvaluationContextRecord Rec = ExprEvalContexts.back();
   ExprEvalContexts.pop_back();
 
-  if (Rec.Context == PotentiallyPotentiallyEvaluated && 
-      Rec.PotentiallyReferenced) {
-    // Mark any remaining declarations in the current position of the stack
-    // as "referenced". If they were not meant to be referenced, semantic
-    // analysis would have eliminated them (e.g., in ActOnCXXTypeId).
-    for (PotentiallyReferencedDecls::iterator 
-              I = Rec.PotentiallyReferenced->begin(),
-           IEnd = Rec.PotentiallyReferenced->end();
-         I != IEnd; ++I)
-      MarkDeclarationReferenced(I->first, I->second);
+  if (Rec.Context == PotentiallyPotentiallyEvaluated) {
+    if (Rec.PotentiallyReferenced) {
+      // Mark any remaining declarations in the current position of the stack
+      // as "referenced". If they were not meant to be referenced, semantic
+      // analysis would have eliminated them (e.g., in ActOnCXXTypeId).
+      for (PotentiallyReferencedDecls::iterator 
+             I = Rec.PotentiallyReferenced->begin(),
+             IEnd = Rec.PotentiallyReferenced->end();
+           I != IEnd; ++I)
+        MarkDeclarationReferenced(I->first, I->second);
+    }
+
+    if (Rec.PotentiallyDiagnosed) {
+      // Emit any pending diagnostics.
+      for (PotentiallyEmittedDiagnostics::iterator
+                I = Rec.PotentiallyDiagnosed->begin(),
+             IEnd = Rec.PotentiallyDiagnosed->end();
+           I != IEnd; ++I)
+        Diag(I->first, I->second);
+    }
   } 
 
   // When are coming out of an unevaluated context, clear out any
@@ -6708,6 +7057,8 @@ void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) {
       if (!Constructor->isUsed())
         DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals);
     }
+    
+    MaybeMarkVirtualMembersReferenced(Loc, Constructor);
   } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
     if (Destructor->isImplicit() && !Destructor->isUsed())
       DefineImplicitDestructor(Loc, Destructor);
diff --git a/lib/Sema/SemaExprCXX.cpp b/lib/Sema/SemaExprCXX.cpp
index 00fb65d..6d991b6 100644
--- a/lib/Sema/SemaExprCXX.cpp
+++ b/lib/Sema/SemaExprCXX.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "Sema.h"
+#include "SemaInit.h"
 #include "Lookup.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/CXXInheritance.h"
@@ -37,8 +38,7 @@ Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
   IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info");
   LookupResult R(*this, TypeInfoII, SourceLocation(), LookupTagName);
   LookupQualifiedName(R, StdNamespace);
-  Decl *TypeInfoDecl = R.getAsSingleDecl(Context);
-  RecordDecl *TypeInfoRecordDecl = dyn_cast_or_null<RecordDecl>(TypeInfoDecl);
+  RecordDecl *TypeInfoRecordDecl = R.getAsSingle<RecordDecl>();
   if (!TypeInfoRecordDecl)
     return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
 
@@ -226,7 +226,9 @@ Sema::ActOnCXXTypeConstructExpr(SourceRange TypeRange, TypeTy *TypeRep,
                                              SourceRange(TypeRange.getBegin(),
                                                          RParenLoc),
                                              DeclarationName(),
-                                             IK_Direct,
+                         InitializationKind::CreateDirect(TypeRange.getBegin(), 
+                                                          LParenLoc, 
+                                                          RParenLoc),
                                              ConstructorArgs);
 
       if (!Constructor)
@@ -322,9 +324,9 @@ Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
     }
   }
 
-  //FIXME: Store DeclaratorInfo in CXXNew expression.
-  DeclaratorInfo *DInfo = 0;
-  QualType AllocType = GetTypeForDeclarator(D, /*Scope=*/0, &DInfo);
+  //FIXME: Store TypeSourceInfo in CXXNew expression.
+  TypeSourceInfo *TInfo = 0;
+  QualType AllocType = GetTypeForDeclarator(D, /*Scope=*/0, &TInfo);
   if (D.isInvalidType())
     return ExprError();
     
@@ -450,12 +452,17 @@ Sema::BuildCXXNew(SourceLocation StartLoc, bool UseGlobal,
     // Skip all the checks.
   } else if ((RT = AllocType->getAs<RecordType>()) &&
              !AllocType->isAggregateType()) {
+    InitializationKind InitKind = InitializationKind::CreateDefault(TypeLoc);
+    if (NumConsArgs > 0)
+      InitKind = InitializationKind::CreateDirect(TypeLoc,
+                                                  PlacementLParen, 
+                                                  PlacementRParen);
     Constructor = PerformInitializationByConstructor(
                       AllocType, move(ConstructorArgs),
                       TypeLoc,
                       SourceRange(TypeLoc, ConstructorRParen),
                       RT->getDecl()->getDeclName(),
-                      NumConsArgs != 0 ? IK_Direct : IK_Default,
+                      InitKind,
                       ConvertedConstructorArgs);
     if (!Constructor)
       return ExprError();
@@ -602,7 +609,8 @@ bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range,
        Alloc != AllocEnd; ++Alloc) {
     // Even member operator new/delete are implicitly treated as
     // static, so don't use AddMemberCandidate.
-    if (FunctionDecl *Fn = dyn_cast<FunctionDecl>(*Alloc)) {
+    if (FunctionDecl *Fn = 
+          dyn_cast<FunctionDecl>((*Alloc)->getUnderlyingDecl())) {
       AddOverloadCandidate(Fn, Args, NumArgs, Candidates,
                            /*SuppressUserConversions=*/false);
       continue;
@@ -761,10 +769,10 @@ void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
                                             &BadAllocType);
   FunctionDecl *Alloc =
     FunctionDecl::Create(Context, GlobalCtx, SourceLocation(), Name,
-                         FnType, /*DInfo=*/0, FunctionDecl::None, false, true);
+                         FnType, /*TInfo=*/0, FunctionDecl::None, false, true);
   Alloc->setImplicit();
   ParmVarDecl *Param = ParmVarDecl::Create(Context, Alloc, SourceLocation(),
-                                           0, Argument, /*DInfo=*/0,
+                                           0, Argument, /*TInfo=*/0,
                                            VarDecl::None, 0);
   Alloc->setParams(Context, &Param, 1);
 
@@ -1270,6 +1278,16 @@ Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
     // Nothing else to do.
     break;
 
+  case ICK_NoReturn_Adjustment:
+    // If both sides are functions (or pointers/references to them), there could
+    // be incompatible exception declarations.
+    if (CheckExceptionSpecCompatibility(From, ToType))
+      return true;      
+      
+    ImpCastExprToType(From, Context.getNoReturnType(From->getType(), false),
+                      CastExpr::CK_NoOp);
+    break;
+      
   case ICK_Integral_Promotion:
   case ICK_Integral_Conversion:
     ImpCastExprToType(From, ToType, CastExpr::CK_IntegralCast);
@@ -1574,7 +1592,7 @@ static bool FindConditionalOverload(Sema &Self, Expr *&LHS, Expr *&RHS,
 
   OverloadCandidateSet::iterator Best;
   switch (Self.BestViableFunction(CandidateSet, Loc, Best)) {
-    case Sema::OR_Success:
+    case OR_Success:
       // We found a match. Perform the conversions on the arguments and move on.
       if (Self.PerformImplicitConversion(LHS, Best->BuiltinTypes.ParamTypes[0],
                                          Best->Conversions[0], "converting") ||
@@ -1583,13 +1601,13 @@ static bool FindConditionalOverload(Sema &Self, Expr *&LHS, Expr *&RHS,
         break;
       return false;
 
-    case Sema::OR_No_Viable_Function:
+    case OR_No_Viable_Function:
       Self.Diag(Loc, diag::err_typecheck_cond_incompatible_operands)
         << LHS->getType() << RHS->getType()
         << LHS->getSourceRange() << RHS->getSourceRange();
       return true;
 
-    case Sema::OR_Ambiguous:
+    case OR_Ambiguous:
       Self.Diag(Loc, diag::err_conditional_ambiguous_ovl)
         << LHS->getType() << RHS->getType()
         << LHS->getSourceRange() << RHS->getSourceRange();
@@ -1597,7 +1615,7 @@ static bool FindConditionalOverload(Sema &Self, Expr *&LHS, Expr *&RHS,
       // the viable candidates.
       break;
 
-    case Sema::OR_Deleted:
+    case OR_Deleted:
       assert(false && "Conditional operator has only built-in overloads");
       break;
   }
@@ -1788,6 +1806,11 @@ QualType Sema::CXXCheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS,
   QualType Composite = FindCompositePointerType(LHS, RHS);
   if (!Composite.isNull())
     return Composite;
+  
+  // Similarly, attempt to find composite type of twp objective-c pointers.
+  Composite = FindCompositeObjCPointerType(LHS, RHS, QuestionLoc);
+  if (!Composite.isNull())
+    return Composite;
 
   // Fourth bullet is same for pointers-to-member. However, the possible
   // conversions are far more limited: we have null-to-pointer, upcast of
@@ -1882,8 +1905,8 @@ QualType Sema::FindCompositePointerType(Expr *&E1, Expr *&E2) {
   assert(getLangOptions().CPlusPlus && "This function assumes C++");
   QualType T1 = E1->getType(), T2 = E2->getType();
 
-  if (!T1->isPointerType() && !T1->isMemberPointerType() &&
-      !T2->isPointerType() && !T2->isMemberPointerType())
+  if (!T1->isAnyPointerType() && !T1->isMemberPointerType() &&
+      !T2->isAnyPointerType() && !T2->isMemberPointerType())
    return QualType();
 
   // C++0x 5.9p2
@@ -2070,14 +2093,17 @@ Expr *Sema::MaybeCreateCXXExprWithTemporaries(Expr *SubExpr,
                                               bool ShouldDestroyTemps) {
   assert(SubExpr && "sub expression can't be null!");
 
-  if (ExprTemporaries.empty())
+  unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries;
+  assert(ExprTemporaries.size() >= FirstTemporary);
+  if (ExprTemporaries.size() == FirstTemporary)
     return SubExpr;
 
   Expr *E = CXXExprWithTemporaries::Create(Context, SubExpr,
-                                           &ExprTemporaries[0],
-                                           ExprTemporaries.size(),
+                                           &ExprTemporaries[FirstTemporary],
+                                    ExprTemporaries.size() - FirstTemporary,
                                            ShouldDestroyTemps);
-  ExprTemporaries.clear();
+  ExprTemporaries.erase(ExprTemporaries.begin() + FirstTemporary,
+                        ExprTemporaries.end());
 
   return E;
 }
@@ -2164,15 +2190,13 @@ Sema::ActOnStartCXXMemberReference(Scope *S, ExprArg Base, SourceLocation OpLoc,
 
 CXXMemberCallExpr *Sema::BuildCXXMemberCallExpr(Expr *Exp, 
                                                 CXXMethodDecl *Method) {
+  if (PerformObjectArgumentInitialization(Exp, Method))
+    assert(0 && "Calling BuildCXXMemberCallExpr with invalid call?");
+
   MemberExpr *ME = 
       new (Context) MemberExpr(Exp, /*IsArrow=*/false, Method, 
                                SourceLocation(), Method->getType());
-  QualType ResultType;
-  if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(Method))
-    ResultType = Conv->getConversionType().getNonReferenceType();
-  else
-    ResultType = Method->getResultType().getNonReferenceType();
-
+  QualType ResultType = Method->getResultType().getNonReferenceType();
   MarkDeclarationReferenced(Exp->getLocStart(), Method);
   CXXMemberCallExpr *CE =
     new (Context) CXXMemberCallExpr(Context, ME, 0, 0, ResultType,
@@ -2208,11 +2232,7 @@ Sema::OwningExprResult Sema::BuildCXXCastArgument(SourceLocation CastLoc,
 
   case CastExpr::CK_UserDefinedConversion: {
     assert(!From->getType()->isPointerType() && "Arg can't have pointer type!");
-  
-    // Cast to base if needed.
-    if (PerformObjectArgumentInitialization(From, Method))
-      return ExprError();
-    
+
     // Create an implicit call expr that calls it.
     CXXMemberCallExpr *CE = BuildCXXMemberCallExpr(From, Method);
     return MaybeBindToTemporary(CE);
diff --git a/lib/Sema/SemaInit.cpp b/lib/Sema/SemaInit.cpp
index 2eba704..4518465 100644
--- a/lib/Sema/SemaInit.cpp
+++ b/lib/Sema/SemaInit.cpp
@@ -15,11 +15,13 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "SemaInit.h"
 #include "Sema.h"
 #include "clang/Parse/Designator.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/ExprCXX.h"
 #include "clang/AST/ExprObjC.h"
+#include "llvm/Support/ErrorHandling.h"
 #include <map>
 using namespace clang;
 
@@ -76,7 +78,7 @@ static bool CheckSingleInitializer(Expr *&Init, QualType DeclType,
       OverloadCandidateSet CandidateSet;
       if (S.IsUserDefinedConversion(Init, DeclType, ICS.UserDefined,
                               CandidateSet,
-                              true, false, false) != S.OR_Ambiguous)
+                              true, false, false) != OR_Ambiguous)
         return S.Diag(Init->getSourceRange().getBegin(),
                       diag::err_typecheck_convert_incompatible)
                       << DeclType << Init->getType() << "initializing"
@@ -230,13 +232,20 @@ bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType,
 
         ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
 
+        // FIXME: Poor location information
+        InitializationKind InitKind
+          = InitializationKind::CreateCopy(Init->getLocStart(), 
+                                           SourceLocation());
+        if (DirectInit)
+          InitKind = InitializationKind::CreateDirect(Init->getLocStart(),
+                                                      SourceLocation(), 
+                                                      SourceLocation());
         CXXConstructorDecl *Constructor
           = PerformInitializationByConstructor(DeclType, 
                                                MultiExprArg(*this, 
                                                             (void **)&Init, 1),
                                                InitLoc, Init->getSourceRange(),
-                                               InitEntity,
-                                               DirectInit? IK_Direct : IK_Copy,
+                                               InitEntity, InitKind,
                                                ConstructorArgs);
         if (!Constructor)
           return true;
@@ -637,8 +646,8 @@ void InitListChecker::CheckExplicitInitList(InitListExpr *IList, QualType &T,
   if (T->isScalarType() && !TopLevelObject)
     SemaRef.Diag(IList->getLocStart(), diag::warn_braces_around_scalar_init)
       << IList->getSourceRange()
-      << CodeModificationHint::CreateRemoval(SourceRange(IList->getLocStart()))
-      << CodeModificationHint::CreateRemoval(SourceRange(IList->getLocEnd()));
+      << CodeModificationHint::CreateRemoval(IList->getLocStart())
+      << CodeModificationHint::CreateRemoval(IList->getLocEnd());
 }
 
 void InitListChecker::CheckListElementTypes(InitListExpr *IList,
@@ -1875,12 +1884,13 @@ bool Sema::CheckValueInitialization(QualType Type, SourceLocation Loc) {
       if (ClassDecl->hasUserDeclaredConstructor()) {
         ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
 
+        // FIXME: Poor location information
         CXXConstructorDecl *Constructor
           = PerformInitializationByConstructor(Type, 
                                                MultiExprArg(*this, 0, 0),
                                                Loc, SourceRange(Loc),
                                                DeclarationName(),
-                                               IK_Direct,
+                                 InitializationKind::CreateValue(Loc, Loc, Loc),
                                                ConstructorArgs);
         if (!Constructor)
           return true;
@@ -1908,3 +1918,1379 @@ bool Sema::CheckValueInitialization(QualType Type, SourceLocation Loc) {
 
   return false;
 }
+
+//===----------------------------------------------------------------------===//
+// Initialization entity
+//===----------------------------------------------------------------------===//
+
+void InitializedEntity::InitDeclLoc() {
+  assert((Kind == EK_Variable || Kind == EK_Parameter || Kind == EK_Member) &&
+         "InitDeclLoc cannot be used with non-declaration entities.");
+  
+  if (TypeSourceInfo *DI = VariableOrMember->getTypeSourceInfo()) {
+    TL = DI->getTypeLoc();
+    return;
+  }
+  
+  // FIXME: Once we've gone through the effort to create the fake 
+  // TypeSourceInfo, should we cache it in the declaration?
+  // (If not, we "leak" it).
+  TypeSourceInfo *DI = VariableOrMember->getASTContext()
+                             .CreateTypeSourceInfo(VariableOrMember->getType());
+  DI->getTypeLoc().initialize(VariableOrMember->getLocation());
+  TL = DI->getTypeLoc();
+}
+
+InitializedEntity InitializedEntity::InitializeBase(ASTContext &Context, 
+                                                    CXXBaseSpecifier *Base)
+{
+  InitializedEntity Result;
+  Result.Kind = EK_Base;
+  Result.Base = Base;
+  // FIXME: CXXBaseSpecifier should store a TypeLoc.
+  TypeSourceInfo *DI = Context.CreateTypeSourceInfo(Base->getType());
+  DI->getTypeLoc().initialize(Base->getSourceRange().getBegin());
+  Result.TL = DI->getTypeLoc();
+  return Result;
+}
+
+//===----------------------------------------------------------------------===//
+// Initialization sequence
+//===----------------------------------------------------------------------===//
+
+void InitializationSequence::Step::Destroy() {
+  switch (Kind) {
+  case SK_ResolveAddressOfOverloadedFunction:
+  case SK_CastDerivedToBaseRValue:
+  case SK_CastDerivedToBaseLValue:
+  case SK_BindReference:
+  case SK_BindReferenceToTemporary:
+  case SK_UserConversion:
+  case SK_QualificationConversionRValue:
+  case SK_QualificationConversionLValue:
+  case SK_ListInitialization:
+  case SK_ConstructorInitialization:
+  case SK_ZeroInitialization:
+    break;
+    
+  case SK_ConversionSequence:
+    delete ICS;
+  }
+}
+
+void InitializationSequence::AddAddressOverloadResolutionStep(
+                                                      FunctionDecl *Function) {
+  Step S;
+  S.Kind = SK_ResolveAddressOfOverloadedFunction;
+  S.Type = Function->getType();
+  S.Function = Function;
+  Steps.push_back(S);
+}
+
+void InitializationSequence::AddDerivedToBaseCastStep(QualType BaseType, 
+                                                      bool IsLValue) {
+  Step S;
+  S.Kind = IsLValue? SK_CastDerivedToBaseLValue : SK_CastDerivedToBaseRValue;
+  S.Type = BaseType;
+  Steps.push_back(S);
+}
+
+void InitializationSequence::AddReferenceBindingStep(QualType T, 
+                                                     bool BindingTemporary) {
+  Step S;
+  S.Kind = BindingTemporary? SK_BindReferenceToTemporary : SK_BindReference;
+  S.Type = T;
+  Steps.push_back(S);
+}
+
+void InitializationSequence::AddUserConversionStep(FunctionDecl *Function,
+                                                   QualType T) {
+  Step S;
+  S.Kind = SK_UserConversion;
+  S.Type = T;
+  S.Function = Function;
+  Steps.push_back(S);
+}
+
+void InitializationSequence::AddQualificationConversionStep(QualType Ty,
+                                                            bool IsLValue) {
+  Step S;
+  S.Kind = IsLValue? SK_QualificationConversionLValue 
+                   : SK_QualificationConversionRValue;
+  S.Type = Ty;
+  Steps.push_back(S);
+}
+
+void InitializationSequence::AddConversionSequenceStep(
+                                       const ImplicitConversionSequence &ICS,
+                                                       QualType T) {
+  Step S;
+  S.Kind = SK_ConversionSequence;
+  S.Type = T;
+  S.ICS = new ImplicitConversionSequence(ICS);
+  Steps.push_back(S);
+}
+
+void InitializationSequence::AddListInitializationStep(QualType T) {
+  Step S;
+  S.Kind = SK_ListInitialization;
+  S.Type = T;
+  Steps.push_back(S);
+}
+
+void 
+InitializationSequence::AddConstructorInitializationStep(
+                                              CXXConstructorDecl *Constructor,
+                                                         QualType T) {
+  Step S;
+  S.Kind = SK_ConstructorInitialization;
+  S.Type = T;
+  S.Function = Constructor;
+  Steps.push_back(S);
+}
+
+void InitializationSequence::AddZeroInitializationStep(QualType T) {
+  Step S;
+  S.Kind = SK_ZeroInitialization;
+  S.Type = T;
+  Steps.push_back(S);
+}
+
+void InitializationSequence::SetOverloadFailure(FailureKind Failure, 
+                                                OverloadingResult Result) {
+  SequenceKind = FailedSequence;
+  this->Failure = Failure;
+  this->FailedOverloadResult = Result;
+}
+
+//===----------------------------------------------------------------------===//
+// Attempt initialization
+//===----------------------------------------------------------------------===//
+
+/// \brief Attempt list initialization (C++0x [dcl.init.list]) 
+static void TryListInitialization(Sema &S, 
+                                  const InitializedEntity &Entity,
+                                  const InitializationKind &Kind,
+                                  InitListExpr *InitList,
+                                  InitializationSequence &Sequence) {
+  // FIXME: We only perform rudimentary checking of list
+  // initializations at this point, then assume that any list
+  // initialization of an array, aggregate, or scalar will be
+  // well-formed. We we actually "perform" list initialization, we'll
+  // do all of the necessary checking.  C++0x initializer lists will
+  // force us to perform more checking here.
+  Sequence.setSequenceKind(InitializationSequence::ListInitialization);
+
+  QualType DestType = Entity.getType().getType();
+
+  // C++ [dcl.init]p13:
+  //   If T is a scalar type, then a declaration of the form 
+  //
+  //     T x = { a };
+  //
+  //   is equivalent to
+  //
+  //     T x = a;
+  if (DestType->isScalarType()) {
+    if (InitList->getNumInits() > 1 && S.getLangOptions().CPlusPlus) {
+      Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForScalar);
+      return;
+    }
+
+    // Assume scalar initialization from a single value works.
+  } else if (DestType->isAggregateType()) {
+    // Assume aggregate initialization works.
+  } else if (DestType->isVectorType()) {
+    // Assume vector initialization works.
+  } else if (DestType->isReferenceType()) {
+    // FIXME: C++0x defines behavior for this.
+    Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList);
+    return;
+  } else if (DestType->isRecordType()) {
+    // FIXME: C++0x defines behavior for this
+    Sequence.SetFailed(InitializationSequence::FK_InitListBadDestinationType);
+  }
+
+  // Add a general "list initialization" step.
+  Sequence.AddListInitializationStep(DestType);
+}
+
+/// \brief Try a reference initialization that involves calling a conversion
+/// function.
+///
+/// FIXME: look intos DRs 656, 896
+static OverloadingResult TryRefInitWithConversionFunction(Sema &S,
+                                             const InitializedEntity &Entity,
+                                             const InitializationKind &Kind,
+                                                          Expr *Initializer,
+                                                          bool AllowRValues,
+                                             InitializationSequence &Sequence) {
+  QualType DestType = Entity.getType().getType();
+  QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType();
+  QualType T1 = cv1T1.getUnqualifiedType();
+  QualType cv2T2 = Initializer->getType();
+  QualType T2 = cv2T2.getUnqualifiedType();
+
+  bool DerivedToBase;
+  assert(!S.CompareReferenceRelationship(Initializer->getLocStart(), 
+                                         T1, T2, DerivedToBase) &&
+         "Must have incompatible references when binding via conversion");
+  (void)DerivedToBase;
+
+  // Build the candidate set directly in the initialization sequence
+  // structure, so that it will persist if we fail.
+  OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
+  CandidateSet.clear();
+
+  // Determine whether we are allowed to call explicit constructors or
+  // explicit conversion operators.
+  bool AllowExplicit = Kind.getKind() == InitializationKind::IK_Direct;
+  
+  const RecordType *T1RecordType = 0;
+  if (AllowRValues && (T1RecordType = T1->getAs<RecordType>())) {
+    // The type we're converting to is a class type. Enumerate its constructors
+    // to see if there is a suitable conversion.
+    CXXRecordDecl *T1RecordDecl = cast<CXXRecordDecl>(T1RecordType->getDecl());
+    
+    DeclarationName ConstructorName
+      = S.Context.DeclarationNames.getCXXConstructorName(
+                           S.Context.getCanonicalType(T1).getUnqualifiedType());
+    DeclContext::lookup_iterator Con, ConEnd;
+    for (llvm::tie(Con, ConEnd) = T1RecordDecl->lookup(ConstructorName);
+         Con != ConEnd; ++Con) {
+      // Find the constructor (which may be a template).
+      CXXConstructorDecl *Constructor = 0;
+      FunctionTemplateDecl *ConstructorTmpl
+        = dyn_cast<FunctionTemplateDecl>(*Con);
+      if (ConstructorTmpl)
+        Constructor = cast<CXXConstructorDecl>(
+                                         ConstructorTmpl->getTemplatedDecl());
+      else
+        Constructor = cast<CXXConstructorDecl>(*Con);
+      
+      if (!Constructor->isInvalidDecl() &&
+          Constructor->isConvertingConstructor(AllowExplicit)) {
+        if (ConstructorTmpl)
+          S.AddTemplateOverloadCandidate(ConstructorTmpl, /*ExplicitArgs*/ 0,
+                                         &Initializer, 1, CandidateSet);
+        else
+          S.AddOverloadCandidate(Constructor, &Initializer, 1, CandidateSet);
+      }
+    }    
+  }
+  
+  if (const RecordType *T2RecordType = T2->getAs<RecordType>()) {
+    // The type we're converting from is a class type, enumerate its conversion
+    // functions.
+    CXXRecordDecl *T2RecordDecl = cast<CXXRecordDecl>(T2RecordType->getDecl());
+
+    // Determine the type we are converting to. If we are allowed to
+    // convert to an rvalue, take the type that the destination type
+    // refers to.
+    QualType ToType = AllowRValues? cv1T1 : DestType;
+
+    const UnresolvedSet *Conversions
+      = T2RecordDecl->getVisibleConversionFunctions();
+    for (UnresolvedSet::iterator I = Conversions->begin(),
+         E = Conversions->end(); 
+         I != E; ++I) {
+      NamedDecl *D = *I;
+      CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
+      if (isa<UsingShadowDecl>(D))
+        D = cast<UsingShadowDecl>(D)->getTargetDecl();
+      
+      FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
+      CXXConversionDecl *Conv;
+      if (ConvTemplate)
+        Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
+      else
+        Conv = cast<CXXConversionDecl>(*I);
+      
+      // If the conversion function doesn't return a reference type,
+      // it can't be considered for this conversion unless we're allowed to
+      // consider rvalues.
+      // FIXME: Do we need to make sure that we only consider conversion 
+      // candidates with reference-compatible results? That might be needed to 
+      // break recursion.
+      if ((AllowExplicit || !Conv->isExplicit()) &&
+          (AllowRValues || Conv->getConversionType()->isLValueReferenceType())){
+        if (ConvTemplate)
+          S.AddTemplateConversionCandidate(ConvTemplate, ActingDC, Initializer,
+                                           ToType, CandidateSet);
+        else
+          S.AddConversionCandidate(Conv, ActingDC, Initializer, cv1T1,
+                                   CandidateSet);
+      }
+    }
+  }
+  
+  SourceLocation DeclLoc = Initializer->getLocStart();
+
+  // Perform overload resolution. If it fails, return the failed result.  
+  OverloadCandidateSet::iterator Best;
+  if (OverloadingResult Result 
+        = S.BestViableFunction(CandidateSet, DeclLoc, Best))
+    return Result;
+
+  FunctionDecl *Function = Best->Function;
+
+  // Compute the returned type of the conversion.
+  if (isa<CXXConversionDecl>(Function))
+    T2 = Function->getResultType();
+  else
+    T2 = cv1T1;
+
+  // Add the user-defined conversion step.
+  Sequence.AddUserConversionStep(Function, T2.getNonReferenceType());
+
+  // Determine whether we need to perform derived-to-base or 
+  // cv-qualification adjustments.
+  bool NewDerivedToBase = false;
+  Sema::ReferenceCompareResult NewRefRelationship
+    = S.CompareReferenceRelationship(DeclLoc, T1, T2.getNonReferenceType(),
+                                     NewDerivedToBase);
+  assert(NewRefRelationship != Sema::Ref_Incompatible &&
+         "Overload resolution picked a bad conversion function");
+  (void)NewRefRelationship;
+  if (NewDerivedToBase)
+    Sequence.AddDerivedToBaseCastStep(
+                                S.Context.getQualifiedType(T1,
+                                  T2.getNonReferenceType().getQualifiers()), 
+                                  /*isLValue=*/true);
+  
+  if (cv1T1.getQualifiers() != T2.getNonReferenceType().getQualifiers())
+    Sequence.AddQualificationConversionStep(cv1T1, T2->isReferenceType());
+  
+  Sequence.AddReferenceBindingStep(cv1T1, !T2->isReferenceType());
+  return OR_Success;
+}
+  
+/// \brief Attempt reference initialization (C++0x [dcl.init.list]) 
+static void TryReferenceInitialization(Sema &S, 
+                                       const InitializedEntity &Entity,
+                                       const InitializationKind &Kind,
+                                       Expr *Initializer,
+                                       InitializationSequence &Sequence) {
+  Sequence.setSequenceKind(InitializationSequence::ReferenceBinding);
+  
+  QualType DestType = Entity.getType().getType();
+  QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType();
+  QualType T1 = cv1T1.getUnqualifiedType();
+  QualType cv2T2 = Initializer->getType();
+  QualType T2 = cv2T2.getUnqualifiedType();
+  SourceLocation DeclLoc = Initializer->getLocStart();
+  
+  // If the initializer is the address of an overloaded function, try
+  // to resolve the overloaded function. If all goes well, T2 is the
+  // type of the resulting function.
+  if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy) {
+    FunctionDecl *Fn = S.ResolveAddressOfOverloadedFunction(Initializer, 
+                                                            T1,
+                                                            false);
+    if (!Fn) {
+      Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
+      return;
+    }
+    
+    Sequence.AddAddressOverloadResolutionStep(Fn);
+    cv2T2 = Fn->getType();
+    T2 = cv2T2.getUnqualifiedType();
+  }
+  
+  // FIXME: Rvalue references
+  bool ForceRValue = false;
+  
+  // Compute some basic properties of the types and the initializer.
+  bool isLValueRef = DestType->isLValueReferenceType();
+  bool isRValueRef = !isLValueRef;
+  bool DerivedToBase = false;
+  Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression :
+                                    Initializer->isLvalue(S.Context);
+  Sema::ReferenceCompareResult RefRelationship
+    = S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2, DerivedToBase);
+  
+  // C++0x [dcl.init.ref]p5:
+  //   A reference to type "cv1 T1" is initialized by an expression of type 
+  //   "cv2 T2" as follows:
+  //
+  //     - If the reference is an lvalue reference and the initializer 
+  //       expression
+  OverloadingResult ConvOvlResult = OR_Success;
+  if (isLValueRef) {
+    if (InitLvalue == Expr::LV_Valid && 
+        RefRelationship >= Sema::Ref_Compatible_With_Added_Qualification) {
+      //   - is an lvalue (but is not a bit-field), and "cv1 T1" is 
+      //     reference-compatible with "cv2 T2," or
+      //
+      // Per C++ [over.best.ics]p2, we ignore whether the lvalue is a 
+      // bit-field when we're determining whether the reference initialization
+      // can occur. This property will be checked by PerformInitialization.
+      if (DerivedToBase)
+        Sequence.AddDerivedToBaseCastStep(
+                         S.Context.getQualifiedType(T1, cv2T2.getQualifiers()), 
+                         /*isLValue=*/true);
+      if (cv1T1.getQualifiers() != cv2T2.getQualifiers())
+        Sequence.AddQualificationConversionStep(cv1T1, /*IsLValue=*/true);
+      Sequence.AddReferenceBindingStep(cv1T1, /*bindingTemporary=*/false);
+      return;
+    }
+    
+    //     - has a class type (i.e., T2 is a class type), where T1 is not 
+    //       reference-related to T2, and can be implicitly converted to an 
+    //       lvalue of type "cv3 T3," where "cv1 T1" is reference-compatible 
+    //       with "cv3 T3" (this conversion is selected by enumerating the 
+    //       applicable conversion functions (13.3.1.6) and choosing the best
+    //       one through overload resolution (13.3)),
+    if (RefRelationship == Sema::Ref_Incompatible && T2->isRecordType()) {
+      ConvOvlResult = TryRefInitWithConversionFunction(S, Entity, Kind, 
+                                                       Initializer,
+                                                       /*AllowRValues=*/false,
+                                                       Sequence);
+      if (ConvOvlResult == OR_Success)
+        return;
+    }
+  }
+  
+  //     - Otherwise, the reference shall be an lvalue reference to a 
+  //       non-volatile const type (i.e., cv1 shall be const), or the reference
+  //       shall be an rvalue reference and the initializer expression shall 
+  //       be an rvalue.
+  if (!((isLValueRef && cv1T1.getCVRQualifiers() == Qualifiers::Const) ||
+        (isRValueRef && InitLvalue != Expr::LV_Valid))) {
+    if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty())
+      Sequence.SetOverloadFailure(
+                        InitializationSequence::FK_ReferenceInitOverloadFailed,
+                                  ConvOvlResult);
+    else if (isLValueRef)
+      Sequence.SetFailed(InitLvalue == Expr::LV_Valid
+        ? (RefRelationship == Sema::Ref_Related
+             ? InitializationSequence::FK_ReferenceInitDropsQualifiers
+             : InitializationSequence::FK_NonConstLValueReferenceBindingToUnrelated)
+        : InitializationSequence::FK_NonConstLValueReferenceBindingToTemporary);
+    else
+      Sequence.SetFailed(
+                    InitializationSequence::FK_RValueReferenceBindingToLValue);
+    
+    return;
+  }
+  
+  //       - If T1 and T2 are class types and
+  if (T1->isRecordType() && T2->isRecordType()) {
+    //       - the initializer expression is an rvalue and "cv1 T1" is 
+    //         reference-compatible with "cv2 T2", or
+    if (InitLvalue != Expr::LV_Valid && 
+        RefRelationship >= Sema::Ref_Compatible_With_Added_Qualification) {
+      if (DerivedToBase)
+        Sequence.AddDerivedToBaseCastStep(
+                         S.Context.getQualifiedType(T1, cv2T2.getQualifiers()), 
+                         /*isLValue=*/false);
+      if (cv1T1.getQualifiers() != cv2T2.getQualifiers())
+        Sequence.AddQualificationConversionStep(cv1T1, /*IsLValue=*/false);
+      Sequence.AddReferenceBindingStep(cv1T1, /*bindingTemporary=*/true);
+      return;
+    }
+    
+    //       - T1 is not reference-related to T2 and the initializer expression
+    //         can be implicitly converted to an rvalue of type "cv3 T3" (this
+    //         conversion is selected by enumerating the applicable conversion
+    //         functions (13.3.1.6) and choosing the best one through overload 
+    //         resolution (13.3)),
+    if (RefRelationship == Sema::Ref_Incompatible) {
+      ConvOvlResult = TryRefInitWithConversionFunction(S, Entity,
+                                                       Kind, Initializer,
+                                                       /*AllowRValues=*/true,
+                                                       Sequence);
+      if (ConvOvlResult)
+        Sequence.SetOverloadFailure(
+                      InitializationSequence::FK_ReferenceInitOverloadFailed,
+                                    ConvOvlResult);
+        
+      return;
+    }
+    
+    Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
+    return;
+  }
+  
+  //      - If the initializer expression is an rvalue, with T2 an array type,
+  //        and "cv1 T1" is reference-compatible with "cv2 T2," the reference
+  //        is bound to the object represented by the rvalue (see 3.10).
+  // FIXME: How can an array type be reference-compatible with anything?
+  // Don't we mean the element types of T1 and T2?
+  
+  //      - Otherwise, a temporary of type “cv1 T1” is created and initialized
+  //        from the initializer expression using the rules for a non-reference
+  //        copy initialization (8.5). The reference is then bound to the 
+  //        temporary. [...]
+  // Determine whether we are allowed to call explicit constructors or
+  // explicit conversion operators.
+  bool AllowExplicit = (Kind.getKind() == InitializationKind::IK_Direct);
+  ImplicitConversionSequence ICS
+    = S.TryImplicitConversion(Initializer, cv1T1,
+                              /*SuppressUserConversions=*/false, AllowExplicit, 
+                              /*ForceRValue=*/false, 
+                              /*FIXME:InOverloadResolution=*/false,
+                              /*UserCast=*/Kind.isExplicitCast());
+            
+  if (ICS.ConversionKind == ImplicitConversionSequence::BadConversion) {
+    // FIXME: Use the conversion function set stored in ICS to turn
+    // this into an overloading ambiguity diagnostic. However, we need
+    // to keep that set as an OverloadCandidateSet rather than as some
+    // other kind of set.
+    Sequence.SetFailed(InitializationSequence::FK_ReferenceInitFailed);
+    return;
+  }
+
+  //        [...] If T1 is reference-related to T2, cv1 must be the
+  //        same cv-qualification as, or greater cv-qualification
+  //        than, cv2; otherwise, the program is ill-formed.
+  if (RefRelationship == Sema::Ref_Related && 
+      !cv1T1.isAtLeastAsQualifiedAs(cv2T2)) {
+    Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
+    return;
+  }
+
+  // Perform the actual conversion.
+  Sequence.AddConversionSequenceStep(ICS, cv1T1);
+  Sequence.AddReferenceBindingStep(cv1T1, /*bindingTemporary=*/true);
+  return;
+}
+
+/// \brief Attempt character array initialization from a string literal
+/// (C++ [dcl.init.string], C99 6.7.8). 
+static void TryStringLiteralInitialization(Sema &S, 
+                                           const InitializedEntity &Entity,
+                                           const InitializationKind &Kind,
+                                           Expr *Initializer,
+                                       InitializationSequence &Sequence) {
+  // FIXME: Implement!
+}
+
+/// \brief Attempt initialization by constructor (C++ [dcl.init]), which
+/// enumerates the constructors of the initialized entity and performs overload
+/// resolution to select the best.
+static void TryConstructorInitialization(Sema &S, 
+                                         const InitializedEntity &Entity,
+                                         const InitializationKind &Kind,
+                                         Expr **Args, unsigned NumArgs,
+                                         QualType DestType,
+                                         InitializationSequence &Sequence) {
+  Sequence.setSequenceKind(InitializationSequence::ConstructorInitialization);
+  
+  // Build the candidate set directly in the initialization sequence
+  // structure, so that it will persist if we fail.
+  OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
+  CandidateSet.clear();
+  
+  // Determine whether we are allowed to call explicit constructors or
+  // explicit conversion operators.
+  bool AllowExplicit = (Kind.getKind() == InitializationKind::IK_Direct ||
+                        Kind.getKind() == InitializationKind::IK_Value ||
+                        Kind.getKind() == InitializationKind::IK_Default);                      
+  
+  // The type we're converting to is a class type. Enumerate its constructors
+  // to see if one is suitable.
+  const RecordType *DestRecordType = DestType->getAs<RecordType>();
+  assert(DestRecordType && "Constructor initialization requires record type");  
+  CXXRecordDecl *DestRecordDecl
+    = cast<CXXRecordDecl>(DestRecordType->getDecl());
+    
+  DeclarationName ConstructorName
+    = S.Context.DeclarationNames.getCXXConstructorName(
+                     S.Context.getCanonicalType(DestType).getUnqualifiedType());
+  DeclContext::lookup_iterator Con, ConEnd;
+  for (llvm::tie(Con, ConEnd) = DestRecordDecl->lookup(ConstructorName);
+       Con != ConEnd; ++Con) {
+    // Find the constructor (which may be a template).
+    CXXConstructorDecl *Constructor = 0;
+    FunctionTemplateDecl *ConstructorTmpl
+      = dyn_cast<FunctionTemplateDecl>(*Con);
+    if (ConstructorTmpl)
+      Constructor = cast<CXXConstructorDecl>(
+                                           ConstructorTmpl->getTemplatedDecl());
+    else
+      Constructor = cast<CXXConstructorDecl>(*Con);
+    
+    if (!Constructor->isInvalidDecl() &&
+        Constructor->isConvertingConstructor(AllowExplicit)) {
+      if (ConstructorTmpl)
+        S.AddTemplateOverloadCandidate(ConstructorTmpl, /*ExplicitArgs*/ 0,
+                                       Args, NumArgs, CandidateSet);
+      else
+        S.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet);
+    }
+  }    
+    
+  SourceLocation DeclLoc = Kind.getLocation();
+  
+  // Perform overload resolution. If it fails, return the failed result.  
+  OverloadCandidateSet::iterator Best;
+  if (OverloadingResult Result 
+        = S.BestViableFunction(CandidateSet, DeclLoc, Best)) {
+    Sequence.SetOverloadFailure(
+                          InitializationSequence::FK_ConstructorOverloadFailed, 
+                                Result);
+    return;
+  }
+  
+  // Add the constructor initialization step. Any cv-qualification conversion is
+  // subsumed by the initialization.
+  Sequence.AddConstructorInitializationStep(
+                                      cast<CXXConstructorDecl>(Best->Function), 
+                                            DestType);
+}
+
+/// \brief Attempt value initialization (C++ [dcl.init]p7).
+static void TryValueInitialization(Sema &S, 
+                                   const InitializedEntity &Entity,
+                                   const InitializationKind &Kind,
+                                   InitializationSequence &Sequence) {
+  // C++ [dcl.init]p5:
+  //
+  //   To value-initialize an object of type T means:
+  QualType T = Entity.getType().getType();
+  
+  //     -- if T is an array type, then each element is value-initialized;
+  while (const ArrayType *AT = S.Context.getAsArrayType(T))
+    T = AT->getElementType();
+  
+  if (const RecordType *RT = T->getAs<RecordType>()) {
+    if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
+      // -- if T is a class type (clause 9) with a user-declared
+      //    constructor (12.1), then the default constructor for T is
+      //    called (and the initialization is ill-formed if T has no
+      //    accessible default constructor);
+      //
+      // FIXME: we really want to refer to a single subobject of the array,
+      // but Entity doesn't have a way to capture that (yet).
+      if (ClassDecl->hasUserDeclaredConstructor())
+        return TryConstructorInitialization(S, Entity, Kind, 0, 0, T, Sequence);
+      
+      // FIXME: non-union class type w/ non-trivial default constructor gets
+      // zero-initialized, then constructor gets called.
+    }
+  }
+
+  Sequence.AddZeroInitializationStep(Entity.getType().getType());
+  Sequence.setSequenceKind(InitializationSequence::ZeroInitialization);
+}
+
+/// \brief Attempt a user-defined conversion between two types (C++ [dcl.init]),
+/// which enumerates all conversion functions and performs overload resolution
+/// to select the best.
+static void TryUserDefinedConversion(Sema &S, 
+                                     const InitializedEntity &Entity,
+                                     const InitializationKind &Kind,
+                                     Expr *Initializer,
+                                     InitializationSequence &Sequence) {
+  Sequence.setSequenceKind(InitializationSequence::UserDefinedConversion);
+  
+  QualType DestType = Entity.getType().getType();
+  assert(!DestType->isReferenceType() && "References are handled elsewhere");
+  QualType SourceType = Initializer->getType();
+  assert((DestType->isRecordType() || SourceType->isRecordType()) &&
+         "Must have a class type to perform a user-defined conversion");
+  
+  // Build the candidate set directly in the initialization sequence
+  // structure, so that it will persist if we fail.
+  OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
+  CandidateSet.clear();
+  
+  // Determine whether we are allowed to call explicit constructors or
+  // explicit conversion operators.
+  bool AllowExplicit = Kind.getKind() == InitializationKind::IK_Direct;
+  
+  if (const RecordType *DestRecordType = DestType->getAs<RecordType>()) {
+    // The type we're converting to is a class type. Enumerate its constructors
+    // to see if there is a suitable conversion.
+    CXXRecordDecl *DestRecordDecl
+      = cast<CXXRecordDecl>(DestRecordType->getDecl());
+    
+    DeclarationName ConstructorName
+      = S.Context.DeclarationNames.getCXXConstructorName(
+                     S.Context.getCanonicalType(DestType).getUnqualifiedType());
+    DeclContext::lookup_iterator Con, ConEnd;
+    for (llvm::tie(Con, ConEnd) = DestRecordDecl->lookup(ConstructorName);
+         Con != ConEnd; ++Con) {
+      // Find the constructor (which may be a template).
+      CXXConstructorDecl *Constructor = 0;
+      FunctionTemplateDecl *ConstructorTmpl
+        = dyn_cast<FunctionTemplateDecl>(*Con);
+      if (ConstructorTmpl)
+        Constructor = cast<CXXConstructorDecl>(
+                                           ConstructorTmpl->getTemplatedDecl());
+      else
+        Constructor = cast<CXXConstructorDecl>(*Con);
+      
+      if (!Constructor->isInvalidDecl() &&
+          Constructor->isConvertingConstructor(AllowExplicit)) {
+        if (ConstructorTmpl)
+          S.AddTemplateOverloadCandidate(ConstructorTmpl, /*ExplicitArgs*/ 0,
+                                         &Initializer, 1, CandidateSet);
+        else
+          S.AddOverloadCandidate(Constructor, &Initializer, 1, CandidateSet);
+      }
+    }    
+  }
+  
+  if (const RecordType *SourceRecordType = SourceType->getAs<RecordType>()) {
+    // The type we're converting from is a class type, enumerate its conversion
+    // functions.
+    CXXRecordDecl *SourceRecordDecl
+      = cast<CXXRecordDecl>(SourceRecordType->getDecl());
+    
+    const UnresolvedSet *Conversions
+      = SourceRecordDecl->getVisibleConversionFunctions();
+    for (UnresolvedSet::iterator I = Conversions->begin(),
+         E = Conversions->end(); 
+         I != E; ++I) {
+      NamedDecl *D = *I;
+      CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
+      if (isa<UsingShadowDecl>(D))
+        D = cast<UsingShadowDecl>(D)->getTargetDecl();
+      
+      FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
+      CXXConversionDecl *Conv;
+      if (ConvTemplate)
+        Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
+      else
+        Conv = cast<CXXConversionDecl>(*I);
+      
+      if (AllowExplicit || !Conv->isExplicit()) {
+        if (ConvTemplate)
+          S.AddTemplateConversionCandidate(ConvTemplate, ActingDC, Initializer,
+                                           DestType, CandidateSet);
+        else
+          S.AddConversionCandidate(Conv, ActingDC, Initializer, DestType,
+                                   CandidateSet);
+      }
+    }
+  }
+  
+  SourceLocation DeclLoc = Initializer->getLocStart();
+  
+  // Perform overload resolution. If it fails, return the failed result.  
+  OverloadCandidateSet::iterator Best;
+  if (OverloadingResult Result 
+        = S.BestViableFunction(CandidateSet, DeclLoc, Best)) {
+    Sequence.SetOverloadFailure(
+                        InitializationSequence::FK_UserConversionOverloadFailed, 
+                                Result);
+    return;
+  }
+  
+  FunctionDecl *Function = Best->Function;
+  
+  if (isa<CXXConstructorDecl>(Function)) {
+    // Add the user-defined conversion step. Any cv-qualification conversion is
+    // subsumed by the initialization.
+    Sequence.AddUserConversionStep(Function, DestType);
+    return;
+  }
+
+  // Add the user-defined conversion step that calls the conversion function.
+  QualType ConvType = Function->getResultType().getNonReferenceType();
+  Sequence.AddUserConversionStep(Function, ConvType);
+
+  // If the conversion following the call to the conversion function is 
+  // interesting, add it as a separate step.
+  if (Best->FinalConversion.First || Best->FinalConversion.Second ||
+      Best->FinalConversion.Third) {
+    ImplicitConversionSequence ICS;
+    ICS.ConversionKind = ImplicitConversionSequence::StandardConversion;
+    ICS.Standard = Best->FinalConversion;
+    Sequence.AddConversionSequenceStep(ICS, DestType);
+  }
+}
+
+/// \brief Attempt an implicit conversion (C++ [conv]) converting from one
+/// non-class type to another.
+static void TryImplicitConversion(Sema &S, 
+                                  const InitializedEntity &Entity,
+                                  const InitializationKind &Kind,
+                                  Expr *Initializer,
+                                  InitializationSequence &Sequence) {
+  ImplicitConversionSequence ICS
+    = S.TryImplicitConversion(Initializer, Entity.getType().getType(),
+                              /*SuppressUserConversions=*/true, 
+                              /*AllowExplicit=*/false,
+                              /*ForceRValue=*/false, 
+                              /*FIXME:InOverloadResolution=*/false,
+                              /*UserCast=*/Kind.isExplicitCast());
+  
+  if (ICS.ConversionKind == ImplicitConversionSequence::BadConversion) {
+    Sequence.SetFailed(InitializationSequence::FK_ConversionFailed);
+    return;
+  }
+  
+  Sequence.AddConversionSequenceStep(ICS, Entity.getType().getType());
+}
+
+InitializationSequence::InitializationSequence(Sema &S,
+                                               const InitializedEntity &Entity,
+                                               const InitializationKind &Kind,
+                                               Expr **Args,
+                                               unsigned NumArgs) {
+  ASTContext &Context = S.Context;
+  
+  // C++0x [dcl.init]p16:
+  //   The semantics of initializers are as follows. The destination type is 
+  //   the type of the object or reference being initialized and the source 
+  //   type is the type of the initializer expression. The source type is not
+  //   defined when the initializer is a braced-init-list or when it is a 
+  //   parenthesized list of expressions.
+  QualType DestType = Entity.getType().getType();
+
+  if (DestType->isDependentType() ||
+      Expr::hasAnyTypeDependentArguments(Args, NumArgs)) {
+    SequenceKind = DependentSequence;
+    return;
+  }
+
+  QualType SourceType;
+  Expr *Initializer = 0;
+  if (Kind.getKind() == InitializationKind::IK_Copy) {
+    Initializer = Args[0];
+    if (!isa<InitListExpr>(Initializer))
+      SourceType = Initializer->getType();
+  }
+  
+  //     - If the initializer is a braced-init-list, the object is 
+  //       list-initialized (8.5.4).
+  if (InitListExpr *InitList = dyn_cast_or_null<InitListExpr>(Initializer)) {
+    TryListInitialization(S, Entity, Kind, InitList, *this);
+    return;
+  }
+  
+  //     - If the destination type is a reference type, see 8.5.3.
+  if (DestType->isReferenceType()) {
+    // C++0x [dcl.init.ref]p1:
+    //   A variable declared to be a T& or T&&, that is, "reference to type T"
+    //   (8.3.2), shall be initialized by an object, or function, of type T or
+    //   by an object that can be converted into a T.
+    // (Therefore, multiple arguments are not permitted.)
+    if (NumArgs != 1)
+      SetFailed(FK_TooManyInitsForReference);
+    else
+      TryReferenceInitialization(S, Entity, Kind, Args[0], *this);
+    return;
+  }
+  
+  //     - If the destination type is an array of characters, an array of 
+  //       char16_t, an array of char32_t, or an array of wchar_t, and the 
+  //       initializer is a string literal, see 8.5.2.
+  if (Initializer && IsStringInit(Initializer, DestType, Context)) {
+    TryStringLiteralInitialization(S, Entity, Kind, Initializer, *this);
+    return;
+  }
+  
+  //     - If the initializer is (), the object is value-initialized.
+  if (Kind.getKind() == InitializationKind::IK_Value) {
+    TryValueInitialization(S, Entity, Kind, *this);
+    return;
+  }
+  
+  //     - Otherwise, if the destination type is an array, the program is 
+  //       ill-formed.
+  if (const ArrayType *AT = Context.getAsArrayType(DestType)) {
+    if (AT->getElementType()->isAnyCharacterType())
+      SetFailed(FK_ArrayNeedsInitListOrStringLiteral);
+    else
+      SetFailed(FK_ArrayNeedsInitList);
+    
+    return;
+  }
+  
+  //     - If the destination type is a (possibly cv-qualified) class type:
+  if (DestType->isRecordType()) {
+    //     - If the initialization is direct-initialization, or if it is 
+    //       copy-initialization where the cv-unqualified version of the 
+    //       source type is the same class as, or a derived class of, the 
+    //       class of the destination, constructors are considered. [...]
+    if (Kind.getKind() == InitializationKind::IK_Direct ||
+        (Kind.getKind() == InitializationKind::IK_Copy &&
+         (Context.hasSameUnqualifiedType(SourceType, DestType) ||
+          S.IsDerivedFrom(SourceType, DestType))))
+      TryConstructorInitialization(S, Entity, Kind, Args, NumArgs, 
+                                   Entity.getType().getType(), *this);
+    //     - Otherwise (i.e., for the remaining copy-initialization cases), 
+    //       user-defined conversion sequences that can convert from the source
+    //       type to the destination type or (when a conversion function is 
+    //       used) to a derived class thereof are enumerated as described in
+    //       13.3.1.4, and the best one is chosen through overload resolution
+    //       (13.3).
+    else
+      TryUserDefinedConversion(S, Entity, Kind, Initializer, *this);
+    return;
+  }
+  
+  //    - Otherwise, if the source type is a (possibly cv-qualified) class 
+  //      type, conversion functions are considered.
+  if (SourceType->isRecordType()) {
+    TryUserDefinedConversion(S, Entity, Kind, Initializer, *this);
+    return;
+  }
+  
+  //    - Otherwise, the initial value of the object being initialized is the
+  //      (possibly converted) value of the initializer expression. Standard
+  //      conversions (Clause 4) will be used, if necessary, to convert the
+  //      initializer expression to the cv-unqualified version of the 
+  //      destination type; no user-defined conversions are considered.
+  TryImplicitConversion(S, Entity, Kind, Initializer, *this);
+}
+
+InitializationSequence::~InitializationSequence() {
+  for (llvm::SmallVectorImpl<Step>::iterator Step = Steps.begin(),
+                                          StepEnd = Steps.end();
+       Step != StepEnd; ++Step)
+    Step->Destroy();
+}
+
+//===----------------------------------------------------------------------===//
+// Perform initialization
+//===----------------------------------------------------------------------===//
+
+Action::OwningExprResult 
+InitializationSequence::Perform(Sema &S,
+                                const InitializedEntity &Entity,
+                                const InitializationKind &Kind,
+                                Action::MultiExprArg Args,
+                                QualType *ResultType) {
+  if (SequenceKind == FailedSequence) {
+    unsigned NumArgs = Args.size();
+    Diagnose(S, Entity, Kind, (Expr **)Args.release(), NumArgs);
+    return S.ExprError();
+  }
+  
+  if (SequenceKind == DependentSequence) {
+    // If the declaration is a non-dependent, incomplete array type
+    // that has an initializer, then its type will be completed once
+    // the initializer is instantiated.
+    if (ResultType && !Entity.getType().getType()->isDependentType() &&
+        Args.size() == 1) {
+      QualType DeclType = Entity.getType().getType();
+      if (const IncompleteArrayType *ArrayT
+                           = S.Context.getAsIncompleteArrayType(DeclType)) {
+        // FIXME: We don't currently have the ability to accurately
+        // compute the length of an initializer list without
+        // performing full type-checking of the initializer list
+        // (since we have to determine where braces are implicitly
+        // introduced and such).  So, we fall back to making the array
+        // type a dependently-sized array type with no specified
+        // bound.
+        if (isa<InitListExpr>((Expr *)Args.get()[0])) {
+          SourceRange Brackets;
+          // Scavange the location of the brackets from the entity, if we can.
+          if (isa<IncompleteArrayTypeLoc>(Entity.getType())) {
+            IncompleteArrayTypeLoc ArrayLoc
+              = cast<IncompleteArrayTypeLoc>(Entity.getType());
+            Brackets = ArrayLoc.getBracketsRange();
+          }
+
+          *ResultType
+            = S.Context.getDependentSizedArrayType(ArrayT->getElementType(),
+                                                   /*NumElts=*/0,
+                                                   ArrayT->getSizeModifier(),
+                                       ArrayT->getIndexTypeCVRQualifiers(),
+                                                   Brackets);
+        }
+
+      }
+    }
+
+    if (Kind.getKind() == InitializationKind::IK_Copy)
+      return Sema::OwningExprResult(S, Args.release()[0]);
+
+    unsigned NumArgs = Args.size();
+    return S.Owned(new (S.Context) ParenListExpr(S.Context,
+                                                 SourceLocation(),
+                                                 (Expr **)Args.release(), 
+                                                 NumArgs,
+                                                 SourceLocation()));
+  }
+
+  QualType DestType = Entity.getType().getType().getNonReferenceType();
+  if (ResultType)
+    *ResultType = Entity.getType().getType();
+
+  Sema::OwningExprResult CurInit(S);
+  // For copy initialization and any other initialization forms that
+  // only have a single initializer, we start with the (only)
+  // initializer we have.
+  // FIXME: DPG is not happy about this. There's confusion regarding whether
+  // we're supposed to start the conversion from the solitary initializer or
+  // from the set of arguments.
+  if (Kind.getKind() == InitializationKind::IK_Copy ||
+      SequenceKind != ConstructorInitialization) {
+    assert(Args.size() == 1);
+    CurInit = Sema::OwningExprResult(S, Args.release()[0]);
+    if (CurInit.isInvalid())
+      return S.ExprError();
+  }
+    
+  // Walk through the computed steps for the initialization sequence, 
+  // performing the specified conversions along the way.
+  for (step_iterator Step = step_begin(), StepEnd = step_end();
+       Step != StepEnd; ++Step) {
+    if (CurInit.isInvalid())
+      return S.ExprError();
+    
+    Expr *CurInitExpr = (Expr *)CurInit.get();
+    QualType SourceType = CurInitExpr->getType();
+    
+    switch (Step->Kind) {
+    case SK_ResolveAddressOfOverloadedFunction:
+      // Overload resolution determined which function invoke; update the 
+      // initializer to reflect that choice.
+      CurInit = S.FixOverloadedFunctionReference(move(CurInit), Step->Function);
+      break;
+        
+    case SK_CastDerivedToBaseRValue:
+    case SK_CastDerivedToBaseLValue: {
+      // We have a derived-to-base cast that produces either an rvalue or an
+      // lvalue. Perform that cast.
+      
+      // Casts to inaccessible base classes are allowed with C-style casts.
+      bool IgnoreBaseAccess = Kind.isCStyleOrFunctionalCast();
+      if (S.CheckDerivedToBaseConversion(SourceType, Step->Type,
+                                         CurInitExpr->getLocStart(),
+                                         CurInitExpr->getSourceRange(),
+                                         IgnoreBaseAccess))
+        return S.ExprError();
+        
+      CurInit = S.Owned(new (S.Context) ImplicitCastExpr(Step->Type,
+                                                    CastExpr::CK_DerivedToBase,
+                                                      (Expr*)CurInit.release(),
+                                     Step->Kind == SK_CastDerivedToBaseLValue));
+      break;
+    }
+        
+    case SK_BindReference:
+      if (FieldDecl *BitField = CurInitExpr->getBitField()) {
+        // References cannot bind to bit fields (C++ [dcl.init.ref]p5).
+        S.Diag(Kind.getLocation(), diag::err_reference_bind_to_bitfield)
+          << Entity.getType().getType().isVolatileQualified()
+          << BitField->getDeclName()
+          << CurInitExpr->getSourceRange();
+        S.Diag(BitField->getLocation(), diag::note_bitfield_decl);
+        return S.ExprError();
+      }
+        
+      // Reference binding does not have any corresponding ASTs.
+
+      // Check exception specifications
+      if (S.CheckExceptionSpecCompatibility(CurInitExpr, DestType))
+        return S.ExprError();
+      break;
+        
+    case SK_BindReferenceToTemporary:
+      // Check exception specifications
+      if (S.CheckExceptionSpecCompatibility(CurInitExpr, DestType))
+        return S.ExprError();
+
+      // FIXME: At present, we have no AST to describe when we need to make a
+      // temporary to bind a reference to. We should.
+      break;
+        
+    case SK_UserConversion: {
+      // We have a user-defined conversion that invokes either a constructor
+      // or a conversion function.
+      CastExpr::CastKind CastKind = CastExpr::CK_Unknown;
+      if (CXXConstructorDecl *Constructor
+                              = dyn_cast<CXXConstructorDecl>(Step->Function)) {
+        // Build a call to the selected constructor.
+        ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(S);
+        SourceLocation Loc = CurInitExpr->getLocStart();
+        CurInit.release(); // Ownership transferred into MultiExprArg, below.
+        
+        // Determine the arguments required to actually perform the constructor
+        // call.
+        if (S.CompleteConstructorCall(Constructor,
+                                      Sema::MultiExprArg(S, 
+                                                         (void **)&CurInitExpr,
+                                                         1),
+                                      Loc, ConstructorArgs))
+          return S.ExprError();
+        
+        // Build the an expression that constructs a temporary.
+        CurInit = S.BuildCXXConstructExpr(Loc, Step->Type, Constructor, 
+                                          move_arg(ConstructorArgs));
+        if (CurInit.isInvalid())
+          return S.ExprError();
+        
+        CastKind = CastExpr::CK_ConstructorConversion;
+      } else {
+        // Build a call to the conversion function.
+        CXXConversionDecl *Conversion = cast<CXXConversionDecl>(Step->Function);
+        
+        // FIXME: Should we move this initialization into a separate 
+        // derived-to-base conversion? I believe the answer is "no", because
+        // we don't want to turn off access control here for c-style casts.
+        if (S.PerformObjectArgumentInitialization(CurInitExpr, Conversion))
+          return S.ExprError();
+
+        // Do a little dance to make sure that CurInit has the proper
+        // pointer.
+        CurInit.release();
+        
+        // Build the actual call to the conversion function.
+        CurInit = S.Owned(S.BuildCXXMemberCallExpr(CurInitExpr, Conversion));
+        if (CurInit.isInvalid() || !CurInit.get())
+          return S.ExprError();
+        
+        CastKind = CastExpr::CK_UserDefinedConversion;
+      }
+      
+      CurInit = S.MaybeBindToTemporary(CurInit.takeAs<Expr>());
+      CurInitExpr = CurInit.takeAs<Expr>();
+      CurInit = S.Owned(new (S.Context) ImplicitCastExpr(CurInitExpr->getType(),
+                                                         CastKind, 
+                                                         CurInitExpr,
+                                                         false));                                                        
+      break;
+    }
+        
+    case SK_QualificationConversionLValue:
+    case SK_QualificationConversionRValue:
+      // Perform a qualification conversion; these can never go wrong.
+      S.ImpCastExprToType(CurInitExpr, Step->Type,
+                          CastExpr::CK_NoOp, 
+                          Step->Kind == SK_QualificationConversionLValue);
+      CurInit.release();
+      CurInit = S.Owned(CurInitExpr);
+      break;
+        
+    case SK_ConversionSequence:
+      if (S.PerformImplicitConversion(CurInitExpr, Step->Type, "converting", 
+                                      false, false, *Step->ICS))
+        return S.ExprError();
+        
+      CurInit.release();
+      CurInit = S.Owned(CurInitExpr);        
+      break;
+
+    case SK_ListInitialization: {
+      InitListExpr *InitList = cast<InitListExpr>(CurInitExpr);
+      QualType Ty = Step->Type;
+      if (S.CheckInitList(InitList, ResultType? *ResultType : Ty))
+        return S.ExprError();
+
+      CurInit.release();
+      CurInit = S.Owned(InitList);
+      break;
+    }
+
+    case SK_ConstructorInitialization: {
+      CXXConstructorDecl *Constructor
+        = cast<CXXConstructorDecl>(Step->Function);
+      
+      // Build a call to the selected constructor.
+      ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(S);
+      SourceLocation Loc = Kind.getLocation();
+          
+      // Determine the arguments required to actually perform the constructor
+      // call.
+      if (S.CompleteConstructorCall(Constructor, move(Args), 
+                                    Loc, ConstructorArgs))
+        return S.ExprError();
+          
+      // Build the an expression that constructs a temporary.
+      CurInit = S.BuildCXXConstructExpr(Loc, Step->Type, Constructor, 
+                                        move_arg(ConstructorArgs));
+      if (CurInit.isInvalid())
+        return S.ExprError();
+          
+      CurInit = S.MaybeBindToTemporary(CurInit.takeAs<Expr>());
+      break;
+    }
+        
+    case SK_ZeroInitialization: {
+      if (Kind.getKind() == InitializationKind::IK_Value)
+        CurInit = S.Owned(new (S.Context) CXXZeroInitValueExpr(Step->Type,
+                                                   Kind.getRange().getBegin(),
+                                                    Kind.getRange().getEnd()));
+      else
+        CurInit = S.Owned(new (S.Context) ImplicitValueInitExpr(Step->Type));
+      break;
+    }
+    }
+  }
+  
+  return move(CurInit);
+}
+
+//===----------------------------------------------------------------------===//
+// Diagnose initialization failures
+//===----------------------------------------------------------------------===//
+bool InitializationSequence::Diagnose(Sema &S, 
+                                      const InitializedEntity &Entity,
+                                      const InitializationKind &Kind,
+                                      Expr **Args, unsigned NumArgs) {
+  if (SequenceKind != FailedSequence)
+    return false;
+  
+  QualType DestType = Entity.getType().getType();
+  switch (Failure) {
+  case FK_TooManyInitsForReference:
+    S.Diag(Kind.getLocation(), diag::err_reference_has_multiple_inits)
+      << SourceRange(Args[0]->getLocStart(), Args[NumArgs - 1]->getLocEnd());
+    break;
+    
+  case FK_ArrayNeedsInitList:
+  case FK_ArrayNeedsInitListOrStringLiteral:
+    S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list)
+      << (Failure == FK_ArrayNeedsInitListOrStringLiteral);
+    break;
+      
+  case FK_AddressOfOverloadFailed:
+    S.ResolveAddressOfOverloadedFunction(Args[0], 
+                                         DestType.getNonReferenceType(),
+                                         true);
+    break;
+      
+  case FK_ReferenceInitOverloadFailed:
+  case FK_UserConversionOverloadFailed:
+    switch (FailedOverloadResult) {
+    case OR_Ambiguous:
+      S.Diag(Kind.getLocation(), diag::err_typecheck_ambiguous_condition)
+        << Args[0]->getType() << DestType.getNonReferenceType()
+        << Args[0]->getSourceRange();
+      S.PrintOverloadCandidates(FailedCandidateSet, true);
+      break;
+        
+    case OR_No_Viable_Function:
+      S.Diag(Kind.getLocation(), diag::err_typecheck_nonviable_condition)
+        << Args[0]->getType() << DestType.getNonReferenceType()
+        << Args[0]->getSourceRange();
+      S.PrintOverloadCandidates(FailedCandidateSet, false);
+      break;
+        
+    case OR_Deleted: {
+      S.Diag(Kind.getLocation(), diag::err_typecheck_deleted_function)
+        << Args[0]->getType() << DestType.getNonReferenceType()
+        << Args[0]->getSourceRange();
+      OverloadCandidateSet::iterator Best;
+      OverloadingResult Ovl = S.BestViableFunction(FailedCandidateSet,
+                                                   Kind.getLocation(),
+                                                   Best);
+      if (Ovl == OR_Deleted) {
+        S.Diag(Best->Function->getLocation(), diag::note_unavailable_here)
+          << Best->Function->isDeleted();
+      } else {
+        llvm_unreachable("Inconsistent overload resolution?");
+      }
+      break;
+    }
+        
+    case OR_Success:
+      llvm_unreachable("Conversion did not fail!");
+      break;
+    }
+    break;
+      
+  case FK_NonConstLValueReferenceBindingToTemporary:
+  case FK_NonConstLValueReferenceBindingToUnrelated:
+    S.Diag(Kind.getLocation(), 
+           Failure == FK_NonConstLValueReferenceBindingToTemporary
+             ? diag::err_lvalue_reference_bind_to_temporary
+             : diag::err_lvalue_reference_bind_to_unrelated)
+      << DestType.getNonReferenceType()
+      << Args[0]->getType()
+      << Args[0]->getSourceRange();
+    break;
+      
+  case FK_RValueReferenceBindingToLValue:
+    S.Diag(Kind.getLocation(), diag::err_lvalue_to_rvalue_ref)
+      << Args[0]->getSourceRange();
+    break;
+      
+  case FK_ReferenceInitDropsQualifiers:
+    S.Diag(Kind.getLocation(), diag::err_reference_bind_drops_quals)
+      << DestType.getNonReferenceType()
+      << Args[0]->getType()
+      << Args[0]->getSourceRange();
+    break;
+      
+  case FK_ReferenceInitFailed:
+    S.Diag(Kind.getLocation(), diag::err_reference_bind_failed)
+      << DestType.getNonReferenceType()
+      << (Args[0]->isLvalue(S.Context) == Expr::LV_Valid)
+      << Args[0]->getType()
+      << Args[0]->getSourceRange();
+    break;
+      
+  case FK_ConversionFailed:
+    S.Diag(Kind.getLocation(), diag::err_cannot_initialize_decl_noname)
+      << DestType
+      << (Args[0]->isLvalue(S.Context) == Expr::LV_Valid)
+      << Args[0]->getType()
+      << Args[0]->getSourceRange();
+    break;
+
+  case FK_TooManyInitsForScalar: {
+    InitListExpr *InitList = cast<InitListExpr>(Args[0]);
+
+    S.Diag(Kind.getLocation(), diag::err_excess_initializers)
+      << /*scalar=*/2 
+      << SourceRange(InitList->getInit(1)->getLocStart(),
+                     InitList->getLocEnd());
+    break;
+  }
+
+  case FK_ReferenceBindingToInitList:
+    S.Diag(Kind.getLocation(), diag::err_reference_bind_init_list)
+      << DestType.getNonReferenceType() << Args[0]->getSourceRange();
+    break;
+
+  case FK_InitListBadDestinationType:
+    S.Diag(Kind.getLocation(), diag::err_init_list_bad_dest_type)
+      << (DestType->isRecordType()) << DestType << Args[0]->getSourceRange();
+    break;
+      
+  case FK_ConstructorOverloadFailed: {
+    SourceRange ArgsRange;
+    if (NumArgs)
+      ArgsRange = SourceRange(Args[0]->getLocStart(), 
+                              Args[NumArgs - 1]->getLocEnd());
+    
+    // FIXME: Using "DestType" for the entity we're printing is probably
+    // bad.
+    switch (FailedOverloadResult) {
+      case OR_Ambiguous:
+        S.Diag(Kind.getLocation(), diag::err_ovl_ambiguous_init)
+          << DestType << ArgsRange;
+        S.PrintOverloadCandidates(FailedCandidateSet, true);
+        break;
+        
+      case OR_No_Viable_Function:
+        S.Diag(Kind.getLocation(), diag::err_ovl_no_viable_function_in_init)
+          << DestType << ArgsRange;
+        S.PrintOverloadCandidates(FailedCandidateSet, false);
+        break;
+        
+      case OR_Deleted: {
+        S.Diag(Kind.getLocation(), diag::err_ovl_deleted_init)
+          << true << DestType << ArgsRange;
+        OverloadCandidateSet::iterator Best;
+        OverloadingResult Ovl = S.BestViableFunction(FailedCandidateSet,
+                                                     Kind.getLocation(),
+                                                     Best);
+        if (Ovl == OR_Deleted) {
+          S.Diag(Best->Function->getLocation(), diag::note_unavailable_here)
+            << Best->Function->isDeleted();
+        } else {
+          llvm_unreachable("Inconsistent overload resolution?");
+        }
+        break;
+      }
+        
+      case OR_Success:
+        llvm_unreachable("Conversion did not fail!");
+        break;
+    }
+    break;
+  }
+  }
+  
+  return true;
+}
diff --git a/lib/Sema/SemaInit.h b/lib/Sema/SemaInit.h
new file mode 100644
index 0000000..2d4b01f
--- /dev/null
+++ b/lib/Sema/SemaInit.h
@@ -0,0 +1,579 @@
+//===--- SemaInit.h - Semantic Analysis for Initializers --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides supporting data types for initialization of objects.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_CLANG_SEMA_INIT_H
+#define LLVM_CLANG_SEMA_INIT_H
+
+#include "SemaOverload.h"
+#include "clang/AST/TypeLoc.h"
+#include "clang/Parse/Action.h"
+#include "clang/Basic/SourceLocation.h"
+#include "llvm/ADT/PointerIntPair.h"
+#include "llvm/ADT/SmallVector.h"
+#include <cassert>
+
+namespace clang {
+  
+class CXXBaseSpecifier;
+class DeclaratorDecl;
+class DeclaratorInfo;
+class FieldDecl;
+class FunctionDecl;
+class ParmVarDecl;
+class Sema;
+class TypeLoc;
+class VarDecl;
+  
+/// \brief Describes an entity that is being initialized.
+class InitializedEntity {
+public:
+  /// \brief Specifies the kind of entity being initialized.
+  enum EntityKind {
+    /// \brief The entity being initialized is a variable.
+    EK_Variable,
+    /// \brief The entity being initialized is a function parameter.
+    EK_Parameter,
+    /// \brief The entity being initialized is the result of a function call.
+    EK_Result,
+    /// \brief The entity being initialized is an exception object that
+    /// is being thrown.
+    EK_Exception,
+    /// \brief The entity being initialized is a temporary object.
+    EK_Temporary,
+    /// \brief The entity being initialized is a base member subobject.
+    EK_Base,
+    /// \brief The entity being initialized is a non-static data member 
+    /// subobject.
+    EK_Member
+  };
+  
+private:
+  /// \brief The kind of entity being initialized.
+  EntityKind Kind;
+
+  /// \brief The type of the object or reference being initialized along with 
+  /// its location information.
+  TypeLoc TL;
+  
+  union {
+    /// \brief When Kind == EK_Variable, EK_Parameter, or EK_Member, 
+    /// the VarDecl, ParmVarDecl, or FieldDecl, respectively.
+    DeclaratorDecl *VariableOrMember;
+    
+    /// \brief When Kind == EK_Result or EK_Exception, the location of the 
+    /// 'return' or 'throw' keyword, respectively. When Kind == EK_Temporary,
+    /// the location where the temporary is being created.
+    unsigned Location;
+    
+    /// \brief When Kind == EK_Base, the base specifier that provides the 
+    /// base class.
+    CXXBaseSpecifier *Base;
+  };
+
+  InitializedEntity() { }
+
+  /// \brief Create the initialization entity for a variable.
+  InitializedEntity(VarDecl *Var)
+    : Kind(EK_Variable), 
+      VariableOrMember(reinterpret_cast<DeclaratorDecl*>(Var)) 
+  {
+    InitDeclLoc();
+  }
+  
+  /// \brief Create the initialization entity for a parameter.
+  InitializedEntity(ParmVarDecl *Parm)
+    : Kind(EK_Parameter), 
+      VariableOrMember(reinterpret_cast<DeclaratorDecl*>(Parm)) 
+  { 
+    InitDeclLoc();
+  }
+  
+  /// \brief Create the initialization entity for the result of a function,
+  /// throwing an object, or performing an explicit cast.
+  InitializedEntity(EntityKind Kind, SourceLocation Loc, TypeLoc TL)
+    : Kind(Kind), TL(TL), Location(Loc.getRawEncoding()) { }
+  
+  /// \brief Create the initialization entity for a member subobject.
+  InitializedEntity(FieldDecl *Member) 
+    : Kind(EK_Member), 
+      VariableOrMember(reinterpret_cast<DeclaratorDecl*>(Member))
+  { 
+    InitDeclLoc();
+  }
+  
+  /// \brief Initialize type-location information from a declaration.
+  void InitDeclLoc();
+  
+public:
+  /// \brief Create the initialization entity for a variable.
+  static InitializedEntity InitializeVariable(VarDecl *Var) {
+    return InitializedEntity(Var);
+  }
+  
+  /// \brief Create the initialization entity for a parameter.
+  static InitializedEntity InitializeParameter(ParmVarDecl *Parm) {
+    return InitializedEntity(Parm);
+  }
+
+  /// \brief Create the initialization entity for the result of a function.
+  static InitializedEntity InitializeResult(SourceLocation ReturnLoc,
+                                            TypeLoc TL) {
+    return InitializedEntity(EK_Result, ReturnLoc, TL);
+  }
+
+  /// \brief Create the initialization entity for an exception object.
+  static InitializedEntity InitializeException(SourceLocation ThrowLoc,
+                                               TypeLoc TL) {
+    return InitializedEntity(EK_Exception, ThrowLoc, TL);
+  }
+  
+  /// \brief Create the initialization entity for a temporary.
+  static InitializedEntity InitializeTemporary(EntityKind Kind, TypeLoc TL) {
+    return InitializedEntity(Kind, SourceLocation(), TL);
+  }
+  
+  /// \brief Create the initialization entity for a base class subobject.
+  static InitializedEntity InitializeBase(ASTContext &Context,
+                                          CXXBaseSpecifier *Base);
+  
+  /// \brief Create the initialize entity for a member subobject.
+  static InitializedEntity InitializeMember(FieldDecl *Member) {
+    return InitializedEntity(Member);
+  }
+  
+  /// \brief Determine the kind of initialization.
+  EntityKind getKind() const { return Kind; }
+  
+  /// \brief Retrieve type being initialized.
+  TypeLoc getType() const { return TL; }
+  
+  /// \brief Determine the location of the 'return' keyword when initializing
+  /// the result of a function call.
+  SourceLocation getReturnLoc() const {
+    assert(getKind() == EK_Result && "No 'return' location!");
+    return SourceLocation::getFromRawEncoding(Location);
+  }
+  
+  /// \brief Determine the location of the 'throw' keyword when initializing
+  /// an exception object.
+  SourceLocation getThrowLoc() const {
+    assert(getKind() == EK_Exception && "No 'throw' location!");
+    return SourceLocation::getFromRawEncoding(Location);
+  }
+};
+  
+/// \brief Describes the kind of initialization being performed, along with 
+/// location information for tokens related to the initialization (equal sign,
+/// parentheses).
+class InitializationKind {
+public:
+  /// \brief The kind of initialization being performed.
+  enum InitKind {
+    IK_Direct,  ///< Direct initialization
+    IK_Copy,    ///< Copy initialization
+    IK_Default, ///< Default initialization
+    IK_Value    ///< Value initialization
+  };
+  
+private:
+  /// \brief The kind of initialization that we're storing.
+  enum StoredInitKind {
+    SIK_Direct = IK_Direct,   ///< Direct initialization
+    SIK_Copy = IK_Copy,       ///< Copy initialization
+    SIK_Default = IK_Default, ///< Default initialization
+    SIK_Value = IK_Value,     ///< Value initialization
+    SIK_DirectCast,  ///< Direct initialization due to a cast
+    /// \brief Direct initialization due to a C-style or functional cast.
+    SIK_DirectCStyleOrFunctionalCast
+  };
+  
+  /// \brief The kind of initialization being performed.
+  StoredInitKind Kind;
+  
+  /// \brief The source locations involved in the initialization.
+  SourceLocation Locations[3];
+  
+  InitializationKind(StoredInitKind Kind, SourceLocation Loc1, 
+                     SourceLocation Loc2, SourceLocation Loc3)
+    : Kind(Kind) 
+  {
+    Locations[0] = Loc1;
+    Locations[1] = Loc2;
+    Locations[2] = Loc3;
+  }
+  
+public:
+  /// \brief Create a direct initialization.
+  static InitializationKind CreateDirect(SourceLocation InitLoc,
+                                         SourceLocation LParenLoc,
+                                         SourceLocation RParenLoc) {
+    return InitializationKind(SIK_Direct, InitLoc, LParenLoc, RParenLoc);
+  }
+
+  /// \brief Create a direct initialization due to a cast.
+  static InitializationKind CreateCast(SourceRange TypeRange,
+                                       bool IsCStyleCast) {
+    return InitializationKind(IsCStyleCast? SIK_DirectCStyleOrFunctionalCast
+                                          : SIK_DirectCast,
+                              TypeRange.getBegin(), TypeRange.getBegin(), 
+                              TypeRange.getEnd());
+  }
+  
+  /// \brief Create a copy initialization.
+  static InitializationKind CreateCopy(SourceLocation InitLoc,
+                                       SourceLocation EqualLoc) {
+    return InitializationKind(SIK_Copy, InitLoc, EqualLoc, EqualLoc);
+  }
+  
+  /// \brief Create a default initialization.
+  static InitializationKind CreateDefault(SourceLocation InitLoc) {
+    return InitializationKind(SIK_Default, InitLoc, InitLoc, InitLoc);
+  }
+  
+  /// \brief Create a value initialization.
+  static InitializationKind CreateValue(SourceLocation InitLoc,
+                                        SourceLocation LParenLoc,
+                                        SourceLocation RParenLoc) {
+    return InitializationKind(SIK_Value, InitLoc, LParenLoc, RParenLoc);
+  }
+  
+  /// \brief Determine the initialization kind.
+  InitKind getKind() const {
+    if (Kind > SIK_Value)
+      return IK_Direct;
+    
+    return (InitKind)Kind;
+  }
+  
+  /// \brief Determine whether this initialization is an explicit cast.
+  bool isExplicitCast() const {
+    return Kind == SIK_DirectCast || Kind == SIK_DirectCStyleOrFunctionalCast;
+  }
+  
+  /// \brief Determine whether this initialization is a C-style cast.
+  bool isCStyleOrFunctionalCast() const { 
+    return Kind == SIK_DirectCStyleOrFunctionalCast; 
+  }
+  
+  /// \brief Retrieve the location at which initialization is occurring.
+  SourceLocation getLocation() const { return Locations[0]; }
+  
+  /// \brief Retrieve the source range that covers the initialization.
+  SourceRange getRange() const { 
+    return SourceRange(Locations[0], Locations[2]);
+  }
+  
+  /// \brief Retrieve the location of the equal sign for copy initialization
+  /// (if present).
+  SourceLocation getEqualLoc() const {
+    assert(Kind == SIK_Copy && "Only copy initialization has an '='");
+    return Locations[1];
+  }
+  
+  /// \brief Retrieve the source range containing the locations of the open
+  /// and closing parentheses for value and direct initializations.
+  SourceRange getParenRange() const {
+    assert((getKind() == IK_Direct || Kind == SIK_Value) &&
+           "Only direct- and value-initialization have parentheses");
+    return SourceRange(Locations[1], Locations[2]);
+  }
+};
+
+/// \brief Describes the sequence of initializations required to initialize
+/// a given object or reference with a set of arguments.
+class InitializationSequence {
+public:
+  /// \brief Describes the kind of initialization sequence computed.
+  ///
+  /// FIXME: Much of this information is in the initialization steps... why is
+  /// it duplicated here?
+  enum SequenceKind {
+    /// \brief A failed initialization sequence. The failure kind tells what
+    /// happened.
+    FailedSequence = 0,
+    
+    /// \brief A dependent initialization, which could not be
+    /// type-checked due to the presence of dependent types or
+    /// dependently-type expressions.
+    DependentSequence,
+
+    /// \brief A user-defined conversion sequence.
+    UserDefinedConversion,
+    
+    /// \brief A constructor call.
+    ConstructorInitialization,
+    
+    /// \brief A reference binding.
+    ReferenceBinding,
+
+    /// \brief List initialization
+    ListInitialization,
+    
+    /// \brief Zero-initialization.
+    ZeroInitialization
+  };
+  
+  /// \brief Describes the kind of a particular step in an initialization
+  /// sequence.
+  enum StepKind {
+    /// \brief Resolve the address of an overloaded function to a specific
+    /// function declaration.
+    SK_ResolveAddressOfOverloadedFunction,
+    /// \brief Perform a derived-to-base cast, producing an rvalue.
+    SK_CastDerivedToBaseRValue,
+    /// \brief Perform a derived-to-base cast, producing an lvalue.
+    SK_CastDerivedToBaseLValue,
+    /// \brief Reference binding to an lvalue.
+    SK_BindReference,
+    /// \brief Reference binding to a temporary.
+    SK_BindReferenceToTemporary,
+    /// \brief Perform a user-defined conversion, either via a conversion
+    /// function or via a constructor.
+    SK_UserConversion,
+    /// \brief Perform a qualification conversion, producing an rvalue.
+    SK_QualificationConversionRValue,
+    /// \brief Perform a qualification conversion, producing an lvalue.
+    SK_QualificationConversionLValue,
+    /// \brief Perform an implicit conversion sequence.
+    SK_ConversionSequence,
+    /// \brief Perform list-initialization
+    SK_ListInitialization,
+    /// \brief Perform initialization via a constructor.
+    SK_ConstructorInitialization,
+    /// \brief Zero-initialize the object
+    SK_ZeroInitialization
+  };
+  
+  /// \brief A single step in the initialization sequence.
+  class Step {
+  public:
+    /// \brief The kind of conversion or initialization step we are taking.
+    StepKind Kind;
+    
+    // \brief The type that results from this initialization.
+    QualType Type;
+    
+    union {
+      /// \brief When Kind == SK_ResolvedOverloadedFunction or Kind ==
+      /// SK_UserConversion, the function that the expression should be 
+      /// resolved to or the conversion function to call, respectively.
+      FunctionDecl *Function;
+      
+      /// \brief When Kind = SK_ConversionSequence, the implicit conversion
+      /// sequence 
+      ImplicitConversionSequence *ICS;
+    };
+    
+    void Destroy();
+  };
+  
+private:
+  /// \brief The kind of initialization sequence computed.
+  enum SequenceKind SequenceKind;
+  
+  /// \brief Steps taken by this initialization.
+  llvm::SmallVector<Step, 4> Steps;
+  
+public:
+  /// \brief Describes why initialization failed.
+  enum FailureKind {
+    /// \brief Too many initializers provided for a reference.
+    FK_TooManyInitsForReference,
+    /// \brief Array must be initialized with an initializer list.
+    FK_ArrayNeedsInitList,
+    /// \brief Array must be initialized with an initializer list or a 
+    /// string literal.
+    FK_ArrayNeedsInitListOrStringLiteral,
+    /// \brief Cannot resolve the address of an overloaded function.
+    FK_AddressOfOverloadFailed,
+    /// \brief Overloading due to reference initialization failed.
+    FK_ReferenceInitOverloadFailed,
+    /// \brief Non-const lvalue reference binding to a temporary.
+    FK_NonConstLValueReferenceBindingToTemporary,
+    /// \brief Non-const lvalue reference binding to an lvalue of unrelated
+    /// type.
+    FK_NonConstLValueReferenceBindingToUnrelated,
+    /// \brief Rvalue reference binding to an lvalue.
+    FK_RValueReferenceBindingToLValue,
+    /// \brief Reference binding drops qualifiers.
+    FK_ReferenceInitDropsQualifiers,
+    /// \brief Reference binding failed.
+    FK_ReferenceInitFailed,
+    /// \brief Implicit conversion failed.
+    FK_ConversionFailed,
+    /// \brief Too many initializers for scalar
+    FK_TooManyInitsForScalar,
+    /// \brief Reference initialization from an initializer list
+    FK_ReferenceBindingToInitList,
+    /// \brief Initialization of some unused destination type with an
+    /// initializer list.
+    FK_InitListBadDestinationType,
+    /// \brief Overloading for a user-defined conversion failed.
+    FK_UserConversionOverloadFailed,
+    /// \brief Overloaded for initialization by constructor failed.
+    FK_ConstructorOverloadFailed
+  };
+  
+private:
+  /// \brief The reason why initialization failued.
+  FailureKind Failure;
+
+  /// \brief The failed result of overload resolution.
+  OverloadingResult FailedOverloadResult;
+  
+  /// \brief The candidate set created when initialization failed.
+  OverloadCandidateSet FailedCandidateSet;
+  
+public:
+  /// \brief Try to perform initialization of the given entity, creating a 
+  /// record of the steps required to perform the initialization.
+  ///
+  /// The generated initialization sequence will either contain enough
+  /// information to diagnose 
+  ///
+  /// \param S the semantic analysis object.
+  ///
+  /// \param Entity the entity being initialized.
+  ///
+  /// \param Kind the kind of initialization being performed.
+  ///
+  /// \param Args the argument(s) provided for initialization.
+  ///
+  /// \param NumArgs the number of arguments provided for initialization.
+  InitializationSequence(Sema &S, 
+                         const InitializedEntity &Entity,
+                         const InitializationKind &Kind,
+                         Expr **Args,
+                         unsigned NumArgs);
+  
+  ~InitializationSequence();
+  
+  /// \brief Perform the actual initialization of the given entity based on
+  /// the computed initialization sequence.
+  ///
+  /// \param S the semantic analysis object.
+  ///
+  /// \param Entity the entity being initialized.
+  ///
+  /// \param Kind the kind of initialization being performed.
+  ///
+  /// \param Args the argument(s) provided for initialization, ownership of
+  /// which is transfered into the routine.
+  ///
+  /// \param ResultType if non-NULL, will be set to the type of the
+  /// initialized object, which is the type of the declaration in most
+  /// cases. However, when the initialized object is a variable of
+  /// incomplete array type and the initializer is an initializer
+  /// list, this type will be set to the completed array type.
+  ///
+  /// \returns an expression that performs the actual object initialization, if
+  /// the initialization is well-formed. Otherwise, emits diagnostics
+  /// and returns an invalid expression.
+  Action::OwningExprResult Perform(Sema &S,
+                                   const InitializedEntity &Entity,
+                                   const InitializationKind &Kind,
+                                   Action::MultiExprArg Args,
+                                   QualType *ResultType = 0);
+  
+  /// \brief Diagnose an potentially-invalid initialization sequence.
+  ///
+  /// \returns true if the initialization sequence was ill-formed, 
+  /// false otherwise.
+  bool Diagnose(Sema &S, 
+                const InitializedEntity &Entity,
+                const InitializationKind &Kind,
+                Expr **Args, unsigned NumArgs);
+  
+  /// \brief Determine the kind of initialization sequence computed.
+  enum SequenceKind getKind() const { return SequenceKind; }
+  
+  /// \brief Set the kind of sequence computed.
+  void setSequenceKind(enum SequenceKind SK) { SequenceKind = SK; }
+  
+  /// \brief Determine whether the initialization sequence is valid.
+  operator bool() const { return SequenceKind != FailedSequence; }
+  
+  typedef llvm::SmallVector<Step, 4>::const_iterator step_iterator;
+  step_iterator step_begin() const { return Steps.begin(); }
+  step_iterator step_end()   const { return Steps.end(); }
+
+  /// \brief Add a new step in the initialization that resolves the address
+  /// of an overloaded function to a specific function declaration.
+  ///
+  /// \param Function the function to which the overloaded function reference
+  /// resolves.
+  void AddAddressOverloadResolutionStep(FunctionDecl *Function);
+  
+  /// \brief Add a new step in the initialization that performs a derived-to-
+  /// base cast.
+  ///
+  /// \param BaseType the base type to which we will be casting.
+  ///
+  /// \param IsLValue true if the result of this cast will be treated as 
+  /// an lvalue.
+  void AddDerivedToBaseCastStep(QualType BaseType, bool IsLValue);
+     
+  /// \brief Add a new step binding a reference to an object.
+  ///
+  /// \param BindingTemporary true if we are binding a reference to a temporary
+  /// object (thereby extending its lifetime); false if we are binding to an
+  /// lvalue or an lvalue treated as an rvalue.
+  void AddReferenceBindingStep(QualType T, bool BindingTemporary);
+  
+  /// \brief Add a new step invoking a conversion function, which is either
+  /// a constructor or a conversion function.
+  void AddUserConversionStep(FunctionDecl *Function, QualType T);
+  
+  /// \brief Add a new step that performs a qualification conversion to the
+  /// given type.
+  void AddQualificationConversionStep(QualType Ty, bool IsLValue);
+  
+  /// \brief Add a new step that applies an implicit conversion sequence.
+  void AddConversionSequenceStep(const ImplicitConversionSequence &ICS,
+                                 QualType T);
+
+  /// \brief Add a list-initialiation step  
+  void AddListInitializationStep(QualType T);
+
+  /// \brief Add a constructor-initialization step.
+  void AddConstructorInitializationStep(CXXConstructorDecl *Constructor,
+                                        QualType T);
+
+  /// \brief Add a zero-initialization step.
+  void AddZeroInitializationStep(QualType T);
+  
+  /// \brief Note that this initialization sequence failed.
+  void SetFailed(FailureKind Failure) {
+    SequenceKind = FailedSequence;
+    this->Failure = Failure;
+  }
+  
+  /// \brief Note that this initialization sequence failed due to failed
+  /// overload resolution.
+  void SetOverloadFailure(FailureKind Failure, OverloadingResult Result);
+  
+  /// \brief Retrieve a reference to the candidate set when overload
+  /// resolution fails.
+  OverloadCandidateSet &getFailedCandidateSet() {
+    return FailedCandidateSet;
+  }
+
+  /// \brief Determine why initialization failed.
+  FailureKind getFailureKind() const {
+    assert(getKind() == FailedSequence && "Not an initialization failure!");
+    return Failure;
+  }
+};
+  
+} // end namespace clang
+
+#endif // LLVM_CLANG_SEMA_INIT_H
diff --git a/lib/Sema/SemaLookup.cpp b/lib/Sema/SemaLookup.cpp
index 8f09827..724e2fc 100644
--- a/lib/Sema/SemaLookup.cpp
+++ b/lib/Sema/SemaLookup.cpp
@@ -222,6 +222,11 @@ getIdentifierNamespacesFromLookupNameKind(Sema::LookupNameKind NameKind,
     IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Tag | Decl::IDNS_Member;
     break;
 
+  case Sema::LookupUsingDeclName:
+    IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Tag
+         | Decl::IDNS_Member | Decl::IDNS_Using;
+    break;
+
   case Sema::LookupObjCProtocolName:
     IDNS = Decl::IDNS_ObjCProtocol;
     break;
@@ -229,10 +234,6 @@ getIdentifierNamespacesFromLookupNameKind(Sema::LookupNameKind NameKind,
   case Sema::LookupObjCImplementationName:
     IDNS = Decl::IDNS_ObjCImplementation;
     break;
-
-  case Sema::LookupObjCCategoryImplName:
-    IDNS = Decl::IDNS_ObjCCategoryImpl;
-    break;
   }
   return IDNS;
 }
@@ -245,7 +246,7 @@ void LookupResult::deletePaths(CXXBasePaths *Paths) {
 /// Resolves the result kind of this lookup.
 void LookupResult::resolveKind() {
   unsigned N = Decls.size();
-
+ 
   // Fast case: no possible ambiguity.
   if (N == 0) {
     assert(ResultKind == NotFound);
@@ -282,9 +283,6 @@ void LookupResult::resolveKind() {
       // If it's not unique, pull something off the back (and
       // continue at this index).
       Decls[I] = Decls[--N];
-    } else if (isa<UnresolvedUsingValueDecl>(D)) {
-      // FIXME: support unresolved using value declarations
-      Decls[I] = Decls[--N];
     } else {
       // Otherwise, do some decl type analysis and then continue.
 
@@ -318,13 +316,13 @@ void LookupResult::resolveKind() {
   //   wherever the object, function, or enumerator name is visible.
   // But it's still an error if there are distinct tag types found,
   // even if they're not visible. (ref?)
-  if (HideTags && HasTag && !Ambiguous && !HasUnresolved &&
-      (HasFunction || HasNonFunction))
+  if (HideTags && HasTag && !Ambiguous &&
+      (HasFunction || HasNonFunction || HasUnresolved))
     Decls[UniqueTagIndex] = Decls[--N];
 
   Decls.set_size(N);
 
-  if (HasFunction && HasNonFunction)
+  if (HasNonFunction && (HasFunction || HasUnresolved))
     Ambiguous = true;
 
   if (Ambiguous)
@@ -337,44 +335,6 @@ void LookupResult::resolveKind() {
     ResultKind = LookupResult::Found;
 }
 
-/// @brief Converts the result of name lookup into a single (possible
-/// NULL) pointer to a declaration.
-///
-/// The resulting declaration will either be the declaration we found
-/// (if only a single declaration was found), an
-/// OverloadedFunctionDecl (if an overloaded function was found), or
-/// NULL (if no declaration was found). This conversion must not be
-/// used anywhere where name lookup could result in an ambiguity.
-///
-/// The OverloadedFunctionDecl conversion is meant as a stop-gap
-/// solution, since it causes the OverloadedFunctionDecl to be
-/// leaked. FIXME: Eventually, there will be a better way to iterate
-/// over the set of overloaded functions returned by name lookup.
-NamedDecl *LookupResult::getAsSingleDecl(ASTContext &C) const {
-  size_t size = Decls.size();
-  if (size == 0) return 0;
-  if (size == 1) return (*begin())->getUnderlyingDecl();
-
-  if (isAmbiguous()) return 0;
-
-  iterator I = begin(), E = end();
-
-  OverloadedFunctionDecl *Ovl
-    = OverloadedFunctionDecl::Create(C, (*I)->getDeclContext(),
-                                        (*I)->getDeclName());
-  for (; I != E; ++I) {
-    NamedDecl *ND = (*I)->getUnderlyingDecl();
-    assert(ND->isFunctionOrFunctionTemplate());
-    if (isa<FunctionDecl>(ND))
-      Ovl->addOverload(cast<FunctionDecl>(ND));
-    else
-      Ovl->addOverload(cast<FunctionTemplateDecl>(ND));
-    // FIXME: UnresolvedUsingDecls.
-  }
-  
-  return Ovl;
-}
-
 void LookupResult::addDeclsFromBasePaths(const CXXBasePaths &P) {
   CXXBasePaths::paths_iterator I, E;
   DeclContext::lookup_iterator DI, DE;
@@ -521,7 +481,12 @@ bool Sema::CppLookupName(LookupResult &R, Scope *S) {
       DeclContext *OuterCtx = findOuterContext(S);
       for (; Ctx && Ctx->getPrimaryContext() != OuterCtx; 
            Ctx = Ctx->getLookupParent()) {
-        if (Ctx->isFunctionOrMethod())
+        // We do not directly look into function or method contexts
+        // (since all local variables are found via the identifier
+        // changes) or in transparent contexts (since those entities
+        // will be found in the nearest enclosing non-transparent
+        // context).
+        if (Ctx->isFunctionOrMethod() || Ctx->isTransparentContext())
           continue;
         
         // Perform qualified name lookup into this context.
@@ -649,6 +614,7 @@ bool Sema::LookupName(LookupResult &R, Scope *S, bool AllowBuiltinCreation) {
     case Sema::LookupOperatorName:
     case Sema::LookupNestedNameSpecifierName:
     case Sema::LookupNamespaceName:
+    case Sema::LookupUsingDeclName:
       assert(false && "C does not perform these kinds of name lookup");
       break;
 
@@ -670,9 +636,6 @@ bool Sema::LookupName(LookupResult &R, Scope *S, bool AllowBuiltinCreation) {
       IDNS = Decl::IDNS_ObjCImplementation;
       break;
 
-    case Sema::LookupObjCCategoryImplName:
-      IDNS = Decl::IDNS_ObjCCategoryImpl;
-      break;
     }
 
     // Scan up the scope chain looking for a decl that matches this
@@ -964,12 +927,14 @@ bool Sema::LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx) {
     case LookupTagName:
       BaseCallback = &CXXRecordDecl::FindTagMember;
       break;
+
+    case LookupUsingDeclName:
+      // This lookup is for redeclarations only.
       
     case LookupOperatorName:
     case LookupNamespaceName:
     case LookupObjCProtocolName:
     case LookupObjCImplementationName:
-    case LookupObjCCategoryImplName:
       // These lookups will never find a member in a C++ class (or base class).
       return false;
       
@@ -1202,7 +1167,7 @@ bool Sema::DiagnoseAmbiguousLookup(LookupResult &Result) {
   }
   }
 
-  llvm::llvm_unreachable("unknown ambiguity kind");
+  llvm_unreachable("unknown ambiguity kind");
   return true;
 }
 
@@ -1610,7 +1575,7 @@ NamedDecl *Sema::LookupSingleName(Scope *S, DeclarationName Name,
                                   RedeclarationKind Redecl) {
   LookupResult R(*this, Name, SourceLocation(), NameKind, Redecl);
   LookupName(R, S);
-  return R.getAsSingleDecl(Context);
+  return R.getAsSingle<NamedDecl>();
 }
 
 /// \brief Find the protocol with the given name, if any.
@@ -1619,13 +1584,6 @@ ObjCProtocolDecl *Sema::LookupProtocol(IdentifierInfo *II) {
   return cast_or_null<ObjCProtocolDecl>(D);
 }
 
-/// \brief Find the Objective-C category implementation with the given
-/// name, if any.
-ObjCCategoryImplDecl *Sema::LookupObjCCategoryImpl(IdentifierInfo *II) {
-  Decl *D = LookupSingleName(TUScope, II, LookupObjCCategoryImplName);
-  return cast_or_null<ObjCCategoryImplDecl>(D);
-}
-
 void Sema::LookupOverloadedOperatorName(OverloadedOperatorKind Op, Scope *S,
                                         QualType T1, QualType T2,
                                         FunctionSet &Functions) {
diff --git a/lib/Sema/SemaOverload.cpp b/lib/Sema/SemaOverload.cpp
index 6ea6a14..561cfdb 100644
--- a/lib/Sema/SemaOverload.cpp
+++ b/lib/Sema/SemaOverload.cpp
@@ -38,6 +38,7 @@ GetConversionCategory(ImplicitConversionKind Kind) {
     ICC_Lvalue_Transformation,
     ICC_Lvalue_Transformation,
     ICC_Lvalue_Transformation,
+    ICC_Identity,
     ICC_Qualification_Adjustment,
     ICC_Promotion,
     ICC_Promotion,
@@ -66,6 +67,7 @@ ImplicitConversionRank GetConversionRank(ImplicitConversionKind Kind) {
     ICR_Exact_Match,
     ICR_Exact_Match,
     ICR_Exact_Match,
+    ICR_Exact_Match,
     ICR_Promotion,
     ICR_Promotion,
     ICR_Promotion,
@@ -91,6 +93,7 @@ const char* GetImplicitConversionName(ImplicitConversionKind Kind) {
     "Lvalue-to-rvalue",
     "Array-to-pointer",
     "Function-to-pointer",
+    "Noreturn adjustment",
     "Qualification",
     "Integral promotion",
     "Floating point promotion",
@@ -172,7 +175,7 @@ isPointerConversionToVoidPointer(ASTContext& Context) const {
   if (First == ICK_Array_To_Pointer)
     FromType = Context.getArrayDecayedType(FromType);
 
-  if (Second == ICK_Pointer_Conversion)
+  if (Second == ICK_Pointer_Conversion && FromType->isPointerType())
     if (const PointerType* ToPtrType = ToType->getAs<PointerType>())
       return ToPtrType->getPointeeType()->isVoidType();
 
@@ -255,12 +258,13 @@ void ImplicitConversionSequence::DebugPrint() const {
 }
 
 // IsOverload - Determine whether the given New declaration is an
-// overload of the Old declaration. This routine returns false if New
-// and Old cannot be overloaded, e.g., if they are functions with the
-// same signature (C++ 1.3.10) or if the Old declaration isn't a
-// function (or overload set). When it does return false and Old is an
-// OverloadedFunctionDecl, MatchedDecl will be set to point to the
-// FunctionDecl that New cannot be overloaded with.
+// overload of the declarations in Old. This routine returns false if
+// New and Old cannot be overloaded, e.g., if New has the same
+// signature as some function in Old (C++ 1.3.10) or if the Old
+// declarations aren't functions (or function templates) at all. When
+// it does return false, MatchedDecl will point to the decl that New
+// cannot be overloaded with.  This decl may be a UsingShadowDecl on
+// top of the underlying declaration.
 //
 // Example: Given the following input:
 //
@@ -271,42 +275,51 @@ void ImplicitConversionSequence::DebugPrint() const {
 // When we process #1, there is no previous declaration of "f",
 // so IsOverload will not be used.
 //
-// When we process #2, Old is a FunctionDecl for #1.  By comparing the
-// parameter types, we see that #1 and #2 are overloaded (since they
-// have different signatures), so this routine returns false;
-// MatchedDecl is unchanged.
+// When we process #2, Old contains only the FunctionDecl for #1.  By
+// comparing the parameter types, we see that #1 and #2 are overloaded
+// (since they have different signatures), so this routine returns
+// false; MatchedDecl is unchanged.
 //
-// When we process #3, Old is an OverloadedFunctionDecl containing #1
-// and #2. We compare the signatures of #3 to #1 (they're overloaded,
-// so we do nothing) and then #3 to #2. Since the signatures of #3 and
-// #2 are identical (return types of functions are not part of the
+// When we process #3, Old is an overload set containing #1 and #2. We
+// compare the signatures of #3 to #1 (they're overloaded, so we do
+// nothing) and then #3 to #2. Since the signatures of #3 and #2 are
+// identical (return types of functions are not part of the
 // signature), IsOverload returns false and MatchedDecl will be set to
 // point to the FunctionDecl for #2.
-bool
-Sema::IsOverload(FunctionDecl *New, LookupResult &Previous, NamedDecl *&Match) {
-  for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
+Sema::OverloadKind
+Sema::CheckOverload(FunctionDecl *New, const LookupResult &Old,
+                    NamedDecl *&Match) {
+  for (LookupResult::iterator I = Old.begin(), E = Old.end();
          I != E; ++I) {
-    NamedDecl *Old = (*I)->getUnderlyingDecl();
-    if (FunctionTemplateDecl *OldT = dyn_cast<FunctionTemplateDecl>(Old)) {
+    NamedDecl *OldD = (*I)->getUnderlyingDecl();
+    if (FunctionTemplateDecl *OldT = dyn_cast<FunctionTemplateDecl>(OldD)) {
       if (!IsOverload(New, OldT->getTemplatedDecl())) {
-        Match = Old;
-        return false;
+        Match = *I;
+        return Ovl_Match;
       }
-    } else if (FunctionDecl *OldF = dyn_cast<FunctionDecl>(Old)) {
+    } else if (FunctionDecl *OldF = dyn_cast<FunctionDecl>(OldD)) {
       if (!IsOverload(New, OldF)) {
-        Match = Old;
-        return false;
+        Match = *I;
+        return Ovl_Match;
       }
+    } else if (isa<UsingDecl>(OldD) || isa<TagDecl>(OldD)) {
+      // We can overload with these, which can show up when doing
+      // redeclaration checks for UsingDecls.
+      assert(Old.getLookupKind() == LookupUsingDeclName);
+    } else if (isa<UnresolvedUsingValueDecl>(OldD)) {
+      // Optimistically assume that an unresolved using decl will
+      // overload; if it doesn't, we'll have to diagnose during
+      // template instantiation.
     } else {
       // (C++ 13p1):
       //   Only function declarations can be overloaded; object and type
       //   declarations cannot be overloaded.
-      Match = Old;
-      return false;
+      Match = *I;
+      return Ovl_NonFunction;
     }
   }
 
-  return true;
+  return Ovl_Overload;
 }
 
 bool Sema::IsOverload(FunctionDecl *New, FunctionDecl *Old) {
@@ -474,6 +487,23 @@ Sema::TryImplicitConversion(Expr* From, QualType ToType,
   return ICS;
 }
 
+/// \brief Determine whether the conversion from FromType to ToType is a valid 
+/// conversion that strips "noreturn" off the nested function type.
+static bool IsNoReturnConversion(ASTContext &Context, QualType FromType, 
+                                 QualType ToType, QualType &ResultTy) {
+  if (Context.hasSameUnqualifiedType(FromType, ToType))
+    return false;
+  
+  // Strip the noreturn off the type we're converting from; noreturn can
+  // safely be removed.
+  FromType = Context.getNoReturnType(FromType, false);
+  if (!Context.hasSameUnqualifiedType(FromType, ToType))
+    return false;
+
+  ResultTy = FromType;
+  return true;
+}
+  
 /// IsStandardConversion - Determines whether there is a standard
 /// conversion sequence (C++ [conv], C++ [over.ics.scs]) from the
 /// expression From to the type ToType. Standard conversion sequences
@@ -553,7 +583,7 @@ Sema::IsStandardConversion(Expr* From, QualType ToType,
     // function. (C++ 4.3p1).
     FromType = Context.getPointerType(FromType);
   } else if (FunctionDecl *Fn
-             = ResolveAddressOfOverloadedFunction(From, ToType, false)) {
+               = ResolveAddressOfOverloadedFunction(From, ToType, false)) {
     // Address of overloaded function (C++ [over.over]).
     SCS.First = ICK_Function_To_Pointer;
 
@@ -644,7 +674,7 @@ Sema::IsStandardConversion(Expr* From, QualType ToType,
   } else if (ToType->isBooleanType() &&
              (FromType->isArithmeticType() ||
               FromType->isEnumeralType() ||
-              FromType->isPointerType() ||
+              FromType->isAnyPointerType() ||
               FromType->isBlockPointerType() ||
               FromType->isMemberPointerType() ||
               FromType->isNullPtrType())) {
@@ -655,6 +685,9 @@ Sema::IsStandardConversion(Expr* From, QualType ToType,
              Context.typesAreCompatible(ToType, FromType)) {
     // Compatible conversions (Clang extension for C function overloading)
     SCS.Second = ICK_Compatible_Conversion;
+  } else if (IsNoReturnConversion(Context, FromType, ToType, FromType)) {
+    // Treat a conversion that strips "noreturn" as an identity conversion.
+    SCS.Second = ICK_NoReturn_Adjustment;
   } else {
     // No second conversion required.
     SCS.Second = ICK_Identity;
@@ -728,19 +761,21 @@ bool Sema::IsIntegralPromotion(Expr *From, QualType FromType, QualType ToType) {
   // can be converted to an rvalue of the first of the following types
   // that can represent all the values of its underlying type: int,
   // unsigned int, long, or unsigned long (C++ 4.5p2).
-  if ((FromType->isEnumeralType() || FromType->isWideCharType())
-      && ToType->isIntegerType()) {
+
+  // We pre-calculate the promotion type for enum types.
+  if (const EnumType *FromEnumType = FromType->getAs<EnumType>())
+    if (ToType->isIntegerType())
+      return Context.hasSameUnqualifiedType(ToType,
+                                FromEnumType->getDecl()->getPromotionType());
+
+  if (FromType->isWideCharType() && ToType->isIntegerType()) {
     // Determine whether the type we're converting from is signed or
     // unsigned.
     bool FromIsSigned;
     uint64_t FromSize = Context.getTypeSize(FromType);
-    if (const EnumType *FromEnumType = FromType->getAs<EnumType>()) {
-      QualType UnderlyingType = FromEnumType->getDecl()->getIntegerType();
-      FromIsSigned = UnderlyingType->isSignedIntegerType();
-    } else {
-      // FIXME: Is wchar_t signed or unsigned? We assume it's signed for now.
-      FromIsSigned = true;
-    }
+    
+    // FIXME: Is wchar_t signed or unsigned? We assume it's signed for now.
+    FromIsSigned = true;
 
     // The types we'll try to promote to, in the appropriate
     // order. Try each of these types.
@@ -1233,7 +1268,7 @@ bool Sema::IsMemberPointerConversion(Expr *From, QualType FromType,
 
   return false;
 }
-
+  
 /// CheckMemberPointerConversion - Check the member pointer conversion from the
 /// expression From to the type ToType. This routine checks for ambiguous or
 /// virtual (FIXME: or inaccessible) base-to-derived member pointer conversions
@@ -1371,13 +1406,13 @@ Sema::IsQualificationConversion(QualType FromType, QualType ToType) {
 /// for overload resolution.
 /// \param UserCast true if looking for user defined conversion for a static
 /// cast.
-Sema::OverloadingResult Sema::IsUserDefinedConversion(
-                                   Expr *From, QualType ToType,
-                                   UserDefinedConversionSequence& User,
-                                   OverloadCandidateSet& CandidateSet,
-                                   bool AllowConversionFunctions,
-                                   bool AllowExplicit, bool ForceRValue,
-                                   bool UserCast) {
+OverloadingResult Sema::IsUserDefinedConversion(Expr *From, QualType ToType,
+                                          UserDefinedConversionSequence& User,
+                                            OverloadCandidateSet& CandidateSet,
+                                                bool AllowConversionFunctions,
+                                                bool AllowExplicit, 
+                                                bool ForceRValue,
+                                                bool UserCast) {
   if (const RecordType *ToRecordType = ToType->getAs<RecordType>()) {
     if (RequireCompleteType(From->getLocStart(), ToType, PDiag())) {
       // We're not going to find any constructors.
@@ -1446,6 +1481,11 @@ Sema::OverloadingResult Sema::IsUserDefinedConversion(
         = FromRecordDecl->getVisibleConversionFunctions();
       for (UnresolvedSet::iterator I = Conversions->begin(),
              E = Conversions->end(); I != E; ++I) {
+        NamedDecl *D = *I;
+        CXXRecordDecl *ActingContext = cast<CXXRecordDecl>(D->getDeclContext());
+        if (isa<UsingShadowDecl>(D))
+          D = cast<UsingShadowDecl>(D)->getTargetDecl();
+
         CXXConversionDecl *Conv;
         FunctionTemplateDecl *ConvTemplate;
         if ((ConvTemplate = dyn_cast<FunctionTemplateDecl>(*I)))
@@ -1455,10 +1495,11 @@ Sema::OverloadingResult Sema::IsUserDefinedConversion(
 
         if (AllowExplicit || !Conv->isExplicit()) {
           if (ConvTemplate)
-            AddTemplateConversionCandidate(ConvTemplate, From, ToType,
-                                           CandidateSet);
+            AddTemplateConversionCandidate(ConvTemplate, ActingContext,
+                                           From, ToType, CandidateSet);
           else
-            AddConversionCandidate(Conv, From, ToType, CandidateSet);
+            AddConversionCandidate(Conv, ActingContext, From, ToType,
+                                   CandidateSet);
         }
       }
     }
@@ -2075,8 +2116,10 @@ bool Sema::PerformCopyInitialization(Expr *&From, QualType ToType,
 /// parameter of the given member function (@c Method) from the
 /// expression @p From.
 ImplicitConversionSequence
-Sema::TryObjectArgumentInitialization(Expr *From, CXXMethodDecl *Method) {
-  QualType ClassType = Context.getTypeDeclType(Method->getParent());
+Sema::TryObjectArgumentInitialization(QualType FromType,
+                                      CXXMethodDecl *Method,
+                                      CXXRecordDecl *ActingContext) {
+  QualType ClassType = Context.getTypeDeclType(ActingContext);
   // [class.dtor]p2: A destructor can be invoked for a const, volatile or
   //                 const volatile object.
   unsigned Quals = isa<CXXDestructorDecl>(Method) ?
@@ -2090,7 +2133,6 @@ Sema::TryObjectArgumentInitialization(Expr *From, CXXMethodDecl *Method) {
   ICS.ConversionKind = ImplicitConversionSequence::BadConversion;
 
   // We need to have an object of class type.
-  QualType FromType = From->getType();
   if (const PointerType *PT = FromType->getAs<PointerType>())
     FromType = PT->getPointeeType();
 
@@ -2150,8 +2192,11 @@ Sema::PerformObjectArgumentInitialization(Expr *&From, CXXMethodDecl *Method) {
     DestType = ImplicitParamRecordType;
   }
 
+  // Note that we always use the true parent context when performing
+  // the actual argument initialization.
   ImplicitConversionSequence ICS
-    = TryObjectArgumentInitialization(From, Method);
+    = TryObjectArgumentInitialization(From->getType(), Method,
+                                      Method->getParent());
   if (ICS.ConversionKind == ImplicitConversionSequence::BadConversion)
     return Diag(From->getSourceRange().getBegin(),
                 diag::err_implicit_object_parameter_init)
@@ -2226,9 +2271,11 @@ Sema::AddOverloadCandidate(FunctionDecl *Function,
       // that is named without a member access expression (e.g.,
       // "this->f") that was either written explicitly or created
       // implicitly. This can happen with a qualified call to a member
-      // function, e.g., X::f(). We use a NULL object as the implied
-      // object argument (C++ [over.call.func]p3).
-      AddMethodCandidate(Method, 0, Args, NumArgs, CandidateSet,
+      // function, e.g., X::f(). We use an empty type for the implied
+      // object argument (C++ [over.call.func]p3), and the acting context
+      // is irrelevant.
+      AddMethodCandidate(Method, Method->getParent(),
+                         QualType(), Args, NumArgs, CandidateSet,
                          SuppressUserConversions, ForceRValue);
       return;
     }
@@ -2340,10 +2387,12 @@ void Sema::AddFunctionCandidates(const FunctionSet &Functions,
   for (FunctionSet::const_iterator F = Functions.begin(),
                                 FEnd = Functions.end();
        F != FEnd; ++F) {
+    // FIXME: using declarations
     if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*F)) {
       if (isa<CXXMethodDecl>(FD) && !cast<CXXMethodDecl>(FD)->isStatic())
         AddMethodCandidate(cast<CXXMethodDecl>(FD),
-                           Args[0], Args + 1, NumArgs - 1, 
+                           cast<CXXMethodDecl>(FD)->getParent(),
+                           Args[0]->getType(), Args + 1, NumArgs - 1, 
                            CandidateSet, SuppressUserConversions);
       else
         AddOverloadCandidate(FD, Args, NumArgs, CandidateSet,
@@ -2353,8 +2402,9 @@ void Sema::AddFunctionCandidates(const FunctionSet &Functions,
       if (isa<CXXMethodDecl>(FunTmpl->getTemplatedDecl()) &&
           !cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl())->isStatic())
         AddMethodTemplateCandidate(FunTmpl,
+                              cast<CXXRecordDecl>(FunTmpl->getDeclContext()),
                                    /*FIXME: explicit args */ 0,
-                                   Args[0], Args + 1, NumArgs - 1,
+                                   Args[0]->getType(), Args + 1, NumArgs - 1,
                                    CandidateSet,
                                    SuppressUserConversions);
       else
@@ -2368,13 +2418,14 @@ void Sema::AddFunctionCandidates(const FunctionSet &Functions,
 
 /// AddMethodCandidate - Adds a named decl (which is some kind of
 /// method) as a method candidate to the given overload set.
-void Sema::AddMethodCandidate(NamedDecl *Decl, Expr *Object,
+void Sema::AddMethodCandidate(NamedDecl *Decl,
+                              QualType ObjectType,
                               Expr **Args, unsigned NumArgs,
                               OverloadCandidateSet& CandidateSet,
                               bool SuppressUserConversions, bool ForceRValue) {
 
   // FIXME: use this
-  //DeclContext *ActingContext = Decl->getDeclContext();
+  CXXRecordDecl *ActingContext = cast<CXXRecordDecl>(Decl->getDeclContext());
 
   if (isa<UsingShadowDecl>(Decl))
     Decl = cast<UsingShadowDecl>(Decl)->getTargetDecl();
@@ -2382,13 +2433,14 @@ void Sema::AddMethodCandidate(NamedDecl *Decl, Expr *Object,
   if (FunctionTemplateDecl *TD = dyn_cast<FunctionTemplateDecl>(Decl)) {
     assert(isa<CXXMethodDecl>(TD->getTemplatedDecl()) &&
            "Expected a member function template");
-    AddMethodTemplateCandidate(TD, /*ExplicitArgs*/ 0,
-                               Object, Args, NumArgs,
+    AddMethodTemplateCandidate(TD, ActingContext, /*ExplicitArgs*/ 0,
+                               ObjectType, Args, NumArgs,
                                CandidateSet,
                                SuppressUserConversions,
                                ForceRValue);
   } else {
-    AddMethodCandidate(cast<CXXMethodDecl>(Decl), Object, Args, NumArgs,
+    AddMethodCandidate(cast<CXXMethodDecl>(Decl), ActingContext,
+                       ObjectType, Args, NumArgs,
                        CandidateSet, SuppressUserConversions, ForceRValue);
   }
 }
@@ -2403,8 +2455,8 @@ void Sema::AddMethodCandidate(NamedDecl *Decl, Expr *Object,
 /// a slightly hacky way to implement the overloading rules for elidable copy
 /// initialization in C++0x (C++0x 12.8p15).
 void
-Sema::AddMethodCandidate(CXXMethodDecl *Method, Expr *Object,
-                         Expr **Args, unsigned NumArgs,
+Sema::AddMethodCandidate(CXXMethodDecl *Method, CXXRecordDecl *ActingContext,
+                         QualType ObjectType, Expr **Args, unsigned NumArgs,
                          OverloadCandidateSet& CandidateSet,
                          bool SuppressUserConversions, bool ForceRValue) {
   const FunctionProtoType* Proto
@@ -2453,13 +2505,14 @@ Sema::AddMethodCandidate(CXXMethodDecl *Method, Expr *Object,
   Candidate.Viable = true;
   Candidate.Conversions.resize(NumArgs + 1);
 
-  if (Method->isStatic() || !Object)
+  if (Method->isStatic() || ObjectType.isNull())
     // The implicit object argument is ignored.
     Candidate.IgnoreObjectArgument = true;
   else {
     // Determine the implicit conversion sequence for the object
     // parameter.
-    Candidate.Conversions[0] = TryObjectArgumentInitialization(Object, Method);
+    Candidate.Conversions[0]
+      = TryObjectArgumentInitialization(ObjectType, Method, ActingContext);
     if (Candidate.Conversions[0].ConversionKind
           == ImplicitConversionSequence::BadConversion) {
       Candidate.Viable = false;
@@ -2500,8 +2553,10 @@ Sema::AddMethodCandidate(CXXMethodDecl *Method, Expr *Object,
 /// function template specialization.
 void
 Sema::AddMethodTemplateCandidate(FunctionTemplateDecl *MethodTmpl,
+                                 CXXRecordDecl *ActingContext,
                         const TemplateArgumentListInfo *ExplicitTemplateArgs,
-                                 Expr *Object, Expr **Args, unsigned NumArgs,
+                                 QualType ObjectType,
+                                 Expr **Args, unsigned NumArgs,
                                  OverloadCandidateSet& CandidateSet,
                                  bool SuppressUserConversions,
                                  bool ForceRValue) {
@@ -2533,7 +2588,8 @@ Sema::AddMethodTemplateCandidate(FunctionTemplateDecl *MethodTmpl,
   assert(Specialization && "Missing member function template specialization?");
   assert(isa<CXXMethodDecl>(Specialization) &&
          "Specialization is not a member function?");
-  AddMethodCandidate(cast<CXXMethodDecl>(Specialization), Object, Args, NumArgs,
+  AddMethodCandidate(cast<CXXMethodDecl>(Specialization), ActingContext,
+                     ObjectType, Args, NumArgs,
                      CandidateSet, SuppressUserConversions, ForceRValue);
 }
 
@@ -2585,6 +2641,7 @@ Sema::AddTemplateOverloadCandidate(FunctionTemplateDecl *FunctionTemplate,
 /// conversion function produces).
 void
 Sema::AddConversionCandidate(CXXConversionDecl *Conversion,
+                             CXXRecordDecl *ActingContext,
                              Expr *From, QualType ToType,
                              OverloadCandidateSet& CandidateSet) {
   assert(!Conversion->getDescribedFunctionTemplate() &&
@@ -2611,7 +2668,9 @@ Sema::AddConversionCandidate(CXXConversionDecl *Conversion,
   // object parameter.
   Candidate.Viable = true;
   Candidate.Conversions.resize(1);
-  Candidate.Conversions[0] = TryObjectArgumentInitialization(From, Conversion);
+  Candidate.Conversions[0]
+    = TryObjectArgumentInitialization(From->getType(), Conversion,
+                                      ActingContext);
   // Conversion functions to a different type in the base class is visible in 
   // the derived class.  So, a derived to base conversion should not participate
   // in overload resolution. 
@@ -2683,6 +2742,7 @@ Sema::AddConversionCandidate(CXXConversionDecl *Conversion,
 /// [temp.deduct.conv]).
 void
 Sema::AddTemplateConversionCandidate(FunctionTemplateDecl *FunctionTemplate,
+                                     CXXRecordDecl *ActingDC,
                                      Expr *From, QualType ToType,
                                      OverloadCandidateSet &CandidateSet) {
   assert(isa<CXXConversionDecl>(FunctionTemplate->getTemplatedDecl()) &&
@@ -2705,7 +2765,7 @@ Sema::AddTemplateConversionCandidate(FunctionTemplateDecl *FunctionTemplate,
   // Add the conversion function template specialization produced by
   // template argument deduction as a candidate.
   assert(Specialization && "Missing function template specialization?");
-  AddConversionCandidate(Specialization, From, ToType, CandidateSet);
+  AddConversionCandidate(Specialization, ActingDC, From, ToType, CandidateSet);
 }
 
 /// AddSurrogateCandidate - Adds a "surrogate" candidate function that
@@ -2714,8 +2774,10 @@ Sema::AddTemplateConversionCandidate(FunctionTemplateDecl *FunctionTemplate,
 /// with the given arguments (C++ [over.call.object]p2-4). Proto is
 /// the type of function that we'll eventually be calling.
 void Sema::AddSurrogateCandidate(CXXConversionDecl *Conversion,
+                                 CXXRecordDecl *ActingContext,
                                  const FunctionProtoType *Proto,
-                                 Expr *Object, Expr **Args, unsigned NumArgs,
+                                 QualType ObjectType,
+                                 Expr **Args, unsigned NumArgs,
                                  OverloadCandidateSet& CandidateSet) {
   if (!CandidateSet.isNewCandidate(Conversion))
     return;
@@ -2735,7 +2797,7 @@ void Sema::AddSurrogateCandidate(CXXConversionDecl *Conversion,
   // Determine the implicit conversion sequence for the implicit
   // object parameter.
   ImplicitConversionSequence ObjectInit
-    = TryObjectArgumentInitialization(Object, Conversion);
+    = TryObjectArgumentInitialization(ObjectType, Conversion, ActingContext);
   if (ObjectInit.ConversionKind == ImplicitConversionSequence::BadConversion) {
     Candidate.Viable = false;
     return;
@@ -2870,7 +2932,8 @@ void Sema::AddMemberOperatorCandidates(OverloadedOperatorKind Op,
                              OperEnd = Operators.end();
          Oper != OperEnd;
          ++Oper)
-      AddMethodCandidate(*Oper, Args[0], Args + 1, NumArgs - 1, CandidateSet,
+      AddMethodCandidate(*Oper, Args[0]->getType(),
+                         Args + 1, NumArgs - 1, CandidateSet,
                          /* SuppressUserConversions = */ false);
   }
 }
@@ -4111,10 +4174,9 @@ Sema::isBetterOverloadCandidate(const OverloadCandidate& Cand1,
 /// function, Best points to the candidate function found.
 ///
 /// \returns The result of overload resolution.
-Sema::OverloadingResult
-Sema::BestViableFunction(OverloadCandidateSet& CandidateSet,
-                         SourceLocation Loc,
-                         OverloadCandidateSet::iterator& Best) {
+OverloadingResult Sema::BestViableFunction(OverloadCandidateSet& CandidateSet,
+                                           SourceLocation Loc,
+                                        OverloadCandidateSet::iterator& Best) {
   // Find the best viable function.
   Best = CandidateSet.end();
   for (OverloadCandidateSet::iterator Cand = CandidateSet.begin();
@@ -4426,7 +4488,10 @@ Sema::ResolveAddressOfOverloadedFunction(Expr *From, QualType ToType,
       continue;
 
     if (FunctionDecl *FunDecl = dyn_cast<FunctionDecl>(*I)) {
-      if (FunctionType == Context.getCanonicalType(FunDecl->getType())) {
+      QualType ResultTy;
+      if (Context.hasSameUnqualifiedType(FunctionType, FunDecl->getType()) ||
+          IsNoReturnConversion(Context, FunDecl->getType(), FunctionType, 
+                               ResultTy)) {
         Matches.insert(cast<FunctionDecl>(FunDecl->getCanonicalDecl()));
         FoundNonTemplateFunction = true;
       }
@@ -5122,7 +5187,7 @@ Sema::CreateOverloadedArraySubscriptExpr(SourceLocation LLoc,
 /// parameter). The caller needs to validate that the member
 /// expression refers to a member function or an overloaded member
 /// function.
-Sema::ExprResult
+Sema::OwningExprResult
 Sema::BuildCallToMemberFunction(Scope *S, Expr *MemExprE,
                                 SourceLocation LParenLoc, Expr **Args,
                                 unsigned NumArgs, SourceLocation *CommaLocs,
@@ -5131,46 +5196,46 @@ Sema::BuildCallToMemberFunction(Scope *S, Expr *MemExprE,
   // argument and the member function we're referring to.
   Expr *NakedMemExpr = MemExprE->IgnoreParens();
   
-  // Extract the object argument.
-  Expr *ObjectArg;
-
   MemberExpr *MemExpr;
   CXXMethodDecl *Method = 0;
   if (isa<MemberExpr>(NakedMemExpr)) {
     MemExpr = cast<MemberExpr>(NakedMemExpr);
-    ObjectArg = MemExpr->getBase();
     Method = cast<CXXMethodDecl>(MemExpr->getMemberDecl());
   } else {
     UnresolvedMemberExpr *UnresExpr = cast<UnresolvedMemberExpr>(NakedMemExpr);
-    ObjectArg = UnresExpr->getBase();
+
+    QualType ObjectType = UnresExpr->getBaseType();
 
     // Add overload candidates
     OverloadCandidateSet CandidateSet;
 
+    // FIXME: avoid copy.
+    TemplateArgumentListInfo TemplateArgsBuffer, *TemplateArgs = 0;
+    if (UnresExpr->hasExplicitTemplateArgs()) {
+      UnresExpr->copyTemplateArgumentsInto(TemplateArgsBuffer);
+      TemplateArgs = &TemplateArgsBuffer;
+    }
+
     for (UnresolvedMemberExpr::decls_iterator I = UnresExpr->decls_begin(),
            E = UnresExpr->decls_end(); I != E; ++I) {
 
-      // TODO: note if we found something through a using declaration
-      NamedDecl *Func = (*I)->getUnderlyingDecl();
-      
+      NamedDecl *Func = *I;
+      CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(Func->getDeclContext());
+      if (isa<UsingShadowDecl>(Func))
+        Func = cast<UsingShadowDecl>(Func)->getTargetDecl();
+
       if ((Method = dyn_cast<CXXMethodDecl>(Func))) {
         // If explicit template arguments were provided, we can't call a
         // non-template member function.
-        if (UnresExpr->hasExplicitTemplateArgs())
+        if (TemplateArgs)
           continue;
         
-        AddMethodCandidate(Method, ObjectArg, Args, NumArgs, CandidateSet,
-                           /*SuppressUserConversions=*/false);
+        AddMethodCandidate(Method, ActingDC, ObjectType, Args, NumArgs,
+                           CandidateSet, /*SuppressUserConversions=*/false);
       } else {
-        // FIXME: avoid copy.
-        TemplateArgumentListInfo TemplateArgs;
-        if (UnresExpr->hasExplicitTemplateArgs())
-          UnresExpr->copyTemplateArgumentsInto(TemplateArgs);
-
         AddMethodTemplateCandidate(cast<FunctionTemplateDecl>(Func),
-                                   (UnresExpr->hasExplicitTemplateArgs()
-                                      ? &TemplateArgs : 0),
-                                   ObjectArg, Args, NumArgs,
+                                   ActingDC, TemplateArgs,
+                                   ObjectType, Args, NumArgs,
                                    CandidateSet,
                                    /*SuppressUsedConversions=*/false);
       }
@@ -5190,14 +5255,14 @@ Sema::BuildCallToMemberFunction(Scope *S, Expr *MemExprE,
         << DeclName << MemExprE->getSourceRange();
       PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false);
       // FIXME: Leaking incoming expressions!
-      return true;
+      return ExprError();
 
     case OR_Ambiguous:
       Diag(UnresExpr->getMemberLoc(), diag::err_ovl_ambiguous_member_call)
         << DeclName << MemExprE->getSourceRange();
       PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false);
       // FIXME: Leaking incoming expressions!
-      return true;
+      return ExprError();
 
     case OR_Deleted:
       Diag(UnresExpr->getMemberLoc(), diag::err_ovl_deleted_member_call)
@@ -5205,16 +5270,24 @@ Sema::BuildCallToMemberFunction(Scope *S, Expr *MemExprE,
         << DeclName << MemExprE->getSourceRange();
       PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false);
       // FIXME: Leaking incoming expressions!
-      return true;
+      return ExprError();
     }
 
     MemExprE = FixOverloadedFunctionReference(MemExprE, Method);
+
+    // If overload resolution picked a static member, build a
+    // non-member call based on that function.
+    if (Method->isStatic()) {
+      return BuildResolvedCallExpr(MemExprE, Method, LParenLoc,
+                                   Args, NumArgs, RParenLoc);
+    }
+
     MemExpr = cast<MemberExpr>(MemExprE->IgnoreParens());
   }
 
   assert(Method && "Member call to something that isn't a method?");
   ExprOwningPtr<CXXMemberCallExpr>
-    TheCall(this, new (Context) CXXMemberCallExpr(Context, MemExpr, Args,
+    TheCall(this, new (Context) CXXMemberCallExpr(Context, MemExprE, Args,
                                                   NumArgs,
                                   Method->getResultType().getNonReferenceType(),
                                   RParenLoc));
@@ -5222,24 +5295,25 @@ Sema::BuildCallToMemberFunction(Scope *S, Expr *MemExprE,
   // Check for a valid return type.
   if (CheckCallReturnType(Method->getResultType(), MemExpr->getMemberLoc(), 
                           TheCall.get(), Method))
-    return true;
+    return ExprError();
   
   // Convert the object argument (for a non-static member function call).
+  Expr *ObjectArg = MemExpr->getBase();
   if (!Method->isStatic() &&
       PerformObjectArgumentInitialization(ObjectArg, Method))
-    return true;
+    return ExprError();
   MemExpr->setBase(ObjectArg);
 
   // Convert the rest of the arguments
   const FunctionProtoType *Proto = cast<FunctionProtoType>(Method->getType());
   if (ConvertArgumentsForCall(&*TheCall, MemExpr, Method, Proto, Args, NumArgs,
                               RParenLoc))
-    return true;
+    return ExprError();
 
   if (CheckFunctionCall(Method, TheCall.get()))
-    return true;
+    return ExprError();
 
-  return MaybeBindToTemporary(TheCall.release()).release();
+  return MaybeBindToTemporary(TheCall.release());
 }
 
 /// BuildCallToObjectOfClassType - Build a call to an object of class
@@ -5276,7 +5350,7 @@ Sema::BuildCallToObjectOfClassType(Scope *S, Expr *Object,
 
   for (LookupResult::iterator Oper = R.begin(), OperEnd = R.end();
        Oper != OperEnd; ++Oper) {
-    AddMethodCandidate(*Oper, Object, Args, NumArgs, CandidateSet,
+    AddMethodCandidate(*Oper, Object->getType(), Args, NumArgs, CandidateSet,
                        /*SuppressUserConversions=*/ false);
   }
   
@@ -5302,12 +5376,17 @@ Sema::BuildCallToObjectOfClassType(Scope *S, Expr *Object,
     = cast<CXXRecordDecl>(Record->getDecl())->getConversionFunctions();
   for (UnresolvedSet::iterator I = Conversions->begin(),
          E = Conversions->end(); I != E; ++I) {
+    NamedDecl *D = *I;
+    CXXRecordDecl *ActingContext = cast<CXXRecordDecl>(D->getDeclContext());
+    if (isa<UsingShadowDecl>(D))
+      D = cast<UsingShadowDecl>(D)->getTargetDecl();
+    
     // Skip over templated conversion functions; they aren't
     // surrogates.
-    if (isa<FunctionTemplateDecl>(*I))
+    if (isa<FunctionTemplateDecl>(D))
       continue;
 
-    CXXConversionDecl *Conv = cast<CXXConversionDecl>(*I);
+    CXXConversionDecl *Conv = cast<CXXConversionDecl>(D);
 
     // Strip the reference type (if any) and then the pointer type (if
     // any) to get down to what might be a function type.
@@ -5316,7 +5395,9 @@ Sema::BuildCallToObjectOfClassType(Scope *S, Expr *Object,
       ConvType = ConvPtrType->getPointeeType();
 
     if (const FunctionProtoType *Proto = ConvType->getAs<FunctionProtoType>())
-      AddSurrogateCandidate(Conv, Proto, Object, Args, NumArgs, CandidateSet);
+      AddSurrogateCandidate(Conv, ActingContext, Proto,
+                            Object->getType(), Args, NumArgs,
+                            CandidateSet);
   }
 
   // Perform overload resolution.
@@ -5372,8 +5453,7 @@ Sema::BuildCallToObjectOfClassType(Scope *S, Expr *Object,
     
     // Create an implicit member expr to refer to the conversion operator.
     // and then call it.
-    CXXMemberCallExpr *CE =
-    BuildCXXMemberCallExpr(Object, Conv);
+    CXXMemberCallExpr *CE = BuildCXXMemberCallExpr(Object, Conv);
       
     return ActOnCallExpr(S, ExprArg(*this, CE), LParenLoc,
                          MultiExprArg(*this, (ExprTy**)Args, NumArgs),
@@ -5503,9 +5583,16 @@ Sema::BuildOverloadedArrowExpr(Scope *S, ExprArg BaseIn, SourceLocation OpLoc) {
   R.suppressDiagnostics();
 
   for (LookupResult::iterator Oper = R.begin(), OperEnd = R.end();
-       Oper != OperEnd; ++Oper)
-    AddMethodCandidate(cast<CXXMethodDecl>(*Oper), Base, 0, 0, CandidateSet,
+       Oper != OperEnd; ++Oper) {
+    NamedDecl *D = *Oper;
+    CXXRecordDecl *ActingContext = cast<CXXRecordDecl>(D->getDeclContext());
+    if (isa<UsingShadowDecl>(D))
+      D = cast<UsingShadowDecl>(D)->getTargetDecl();
+
+    AddMethodCandidate(cast<CXXMethodDecl>(D), ActingContext,
+                       Base->getType(), 0, 0, CandidateSet,
                        /*SuppressUserConversions=*/false);
+  }
 
   // Perform overload resolution.
   OverloadCandidateSet::iterator Best;
@@ -5632,19 +5719,11 @@ Expr *Sema::FixOverloadedFunctionReference(Expr *E, FunctionDecl *Fn) {
   } 
 
   if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
+    // FIXME: avoid copy.
+    TemplateArgumentListInfo TemplateArgsBuffer, *TemplateArgs = 0;
     if (ULE->hasExplicitTemplateArgs()) {
-      // FIXME: avoid copy.
-      TemplateArgumentListInfo TemplateArgs;
-      if (ULE->hasExplicitTemplateArgs())
-        ULE->copyTemplateArgumentsInto(TemplateArgs);
-
-      return DeclRefExpr::Create(Context,
-                                 ULE->getQualifier(),
-                                 ULE->getQualifierRange(),
-                                 Fn,
-                                 ULE->getNameLoc(),
-                                 Fn->getType(),
-                                 &TemplateArgs);
+      ULE->copyTemplateArgumentsInto(TemplateArgsBuffer);
+      TemplateArgs = &TemplateArgsBuffer;
     }
 
     return DeclRefExpr::Create(Context,
@@ -5652,23 +5731,43 @@ Expr *Sema::FixOverloadedFunctionReference(Expr *E, FunctionDecl *Fn) {
                                ULE->getQualifierRange(),
                                Fn,
                                ULE->getNameLoc(),
-                               Fn->getType());
+                               Fn->getType(),
+                               TemplateArgs);
   }
 
   if (UnresolvedMemberExpr *MemExpr = dyn_cast<UnresolvedMemberExpr>(E)) {
     // FIXME: avoid copy.
-    TemplateArgumentListInfo TemplateArgs;
-    if (MemExpr->hasExplicitTemplateArgs())
-      MemExpr->copyTemplateArgumentsInto(TemplateArgs);
+    TemplateArgumentListInfo TemplateArgsBuffer, *TemplateArgs = 0;
+    if (MemExpr->hasExplicitTemplateArgs()) {
+      MemExpr->copyTemplateArgumentsInto(TemplateArgsBuffer);
+      TemplateArgs = &TemplateArgsBuffer;
+    }
 
-    return MemberExpr::Create(Context, MemExpr->getBase()->Retain(),
+    Expr *Base;
+
+    // If we're filling in 
+    if (MemExpr->isImplicitAccess()) {
+      if (cast<CXXMethodDecl>(Fn)->isStatic()) {
+        return DeclRefExpr::Create(Context,
+                                   MemExpr->getQualifier(),
+                                   MemExpr->getQualifierRange(),
+                                   Fn,
+                                   MemExpr->getMemberLoc(),
+                                   Fn->getType(),
+                                   TemplateArgs);
+      } else
+        Base = new (Context) CXXThisExpr(SourceLocation(),
+                                         MemExpr->getBaseType());
+    } else
+      Base = MemExpr->getBase()->Retain();
+
+    return MemberExpr::Create(Context, Base,
                               MemExpr->isArrow(), 
                               MemExpr->getQualifier(), 
                               MemExpr->getQualifierRange(),
                               Fn, 
                               MemExpr->getMemberLoc(),
-                              (MemExpr->hasExplicitTemplateArgs()
-                                 ? &TemplateArgs : 0),
+                              TemplateArgs,
                               Fn->getType());
   }
   
@@ -5676,4 +5775,9 @@ Expr *Sema::FixOverloadedFunctionReference(Expr *E, FunctionDecl *Fn) {
   return E->Retain();
 }
 
+Sema::OwningExprResult Sema::FixOverloadedFunctionReference(OwningExprResult E, 
+                                                            FunctionDecl *Fn) {
+  return Owned(FixOverloadedFunctionReference((Expr *)E.get(), Fn));
+}
+
 } // end namespace clang
diff --git a/lib/Sema/SemaOverload.h b/lib/Sema/SemaOverload.h
index 0d1f37a..3613d60 100644
--- a/lib/Sema/SemaOverload.h
+++ b/lib/Sema/SemaOverload.h
@@ -15,12 +15,26 @@
 #ifndef LLVM_CLANG_SEMA_OVERLOAD_H
 #define LLVM_CLANG_SEMA_OVERLOAD_H
 
+#include "clang/AST/Decl.h"
+#include "clang/AST/Type.h"
+#include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallVector.h"
 
 namespace clang {
+  class ASTContext;
   class CXXConstructorDecl;
+  class CXXConversionDecl;
   class FunctionDecl;
 
+  /// OverloadingResult - Capture the result of performing overload
+  /// resolution.
+  enum OverloadingResult {
+    OR_Success,             ///< Overload resolution succeeded.
+    OR_No_Viable_Function,  ///< No viable function found.
+    OR_Ambiguous,           ///< Ambiguous candidates found.
+    OR_Deleted              ///< Overload resoltuion refers to a deleted function.
+  };
+    
   /// ImplicitConversionKind - The kind of implicit conversion used to
   /// convert an argument to a parameter's type. The enumerator values
   /// match with Table 9 of (C++ 13.3.3.1.1) and are listed such that
@@ -30,6 +44,7 @@ namespace clang {
     ICK_Lvalue_To_Rvalue,      ///< Lvalue-to-rvalue conversion (C++ 4.1)
     ICK_Array_To_Pointer,      ///< Array-to-pointer conversion (C++ 4.2)
     ICK_Function_To_Pointer,   ///< Function-to-pointer (C++ 4.3)
+    ICK_NoReturn_Adjustment,   ///< Removal of noreturn from a type (Clang)
     ICK_Qualification,         ///< Qualification conversions (C++ 4.4)
     ICK_Integral_Promotion,    ///< Integral promotions (C++ 4.5)
     ICK_Floating_Promotion,    ///< Floating point promotions (C++ 4.6)
@@ -270,6 +285,7 @@ namespace clang {
   /// OverloadCandidateSet - A set of overload candidates, used in C++
   /// overload resolution (C++ 13.3).
   class OverloadCandidateSet : public llvm::SmallVector<OverloadCandidate, 16> {
+    typedef llvm::SmallVector<OverloadCandidate, 16> inherited;
     llvm::SmallPtrSet<Decl *, 16> Functions;
     
   public:
@@ -278,6 +294,12 @@ namespace clang {
     bool isNewCandidate(Decl *F) { 
       return Functions.insert(F->getCanonicalDecl()); 
     }
+
+    /// \brief Clear out all of the candidates.
+    void clear() {
+      inherited::clear();
+      Functions.clear();
+    }
   };
 } // end namespace clang
 
diff --git a/lib/Sema/SemaTemplate.cpp b/lib/Sema/SemaTemplate.cpp
index f47577e..ac1b1ec 100644
--- a/lib/Sema/SemaTemplate.cpp
+++ b/lib/Sema/SemaTemplate.cpp
@@ -108,36 +108,36 @@ TemplateNameKind Sema::isTemplateName(Scope *S,
   if (R.empty())
     return TNK_Non_template;
 
-  NamedDecl *Template = R.getAsSingleDecl(Context);
-
-  if (SS.isSet() && !SS.isInvalid()) {
-    NestedNameSpecifier *Qualifier
-      = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
-    if (OverloadedFunctionDecl *Ovl
-          = dyn_cast<OverloadedFunctionDecl>(Template))
-      TemplateResult
-        = TemplateTy::make(Context.getQualifiedTemplateName(Qualifier, false,
-                                                            Ovl));
-    else
-      TemplateResult
-        = TemplateTy::make(Context.getQualifiedTemplateName(Qualifier, false,
-                                                 cast<TemplateDecl>(Template)));
-  } else if (OverloadedFunctionDecl *Ovl
-               = dyn_cast<OverloadedFunctionDecl>(Template)) {
-    TemplateResult = TemplateTy::make(TemplateName(Ovl));
+  TemplateName Template;
+  TemplateNameKind TemplateKind;
+
+  unsigned ResultCount = R.end() - R.begin();
+  if (ResultCount > 1) {
+    // We assume that we'll preserve the qualifier from a function
+    // template name in other ways.
+    Template = Context.getOverloadedTemplateName(R.begin(), R.end());
+    TemplateKind = TNK_Function_template;
   } else {
-    TemplateResult = TemplateTy::make(
-                                  TemplateName(cast<TemplateDecl>(Template)));
-  }
+    TemplateDecl *TD = cast<TemplateDecl>((*R.begin())->getUnderlyingDecl());
+
+    if (SS.isSet() && !SS.isInvalid()) {
+      NestedNameSpecifier *Qualifier
+        = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
+      Template = Context.getQualifiedTemplateName(Qualifier, false, TD);
+    } else {
+      Template = TemplateName(TD);
+    }
 
-  if (isa<ClassTemplateDecl>(Template) ||
-      isa<TemplateTemplateParmDecl>(Template))
-    return TNK_Type_template;
+    if (isa<FunctionTemplateDecl>(TD))
+      TemplateKind = TNK_Function_template;
+    else {
+      assert(isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD));
+      TemplateKind = TNK_Type_template;
+    }
+  }
 
-  assert((isa<FunctionTemplateDecl>(Template) ||
-          isa<OverloadedFunctionDecl>(Template)) &&
-         "Unhandled template kind in Sema::isTemplateName");
-  return TNK_Function_template;  
+  TemplateResult = TemplateTy::make(Template);
+  return TemplateKind;
 }
 
 void Sema::LookupTemplateName(LookupResult &Found,
@@ -248,126 +248,30 @@ void Sema::LookupTemplateName(LookupResult &Found,
   }
 }
 
-/// Constructs a full type for the given nested-name-specifier.
-static QualType GetTypeForQualifier(ASTContext &Context,
-                                    NestedNameSpecifier *Qualifier) {
-  // Three possibilities:
-
-  // 1.  A namespace (global or not).
-  assert(!Qualifier->getAsNamespace() && "can't construct type for namespace");
-
-  // 2.  A type (templated or not).
-  Type *Ty = Qualifier->getAsType();
-  if (Ty) return QualType(Ty, 0);
-
-  // 3.  A dependent identifier.
-  assert(Qualifier->getAsIdentifier());
-  return Context.getTypenameType(Qualifier->getPrefix(),
-                                 Qualifier->getAsIdentifier());
-}
-
-static bool HasDependentTypeAsBase(ASTContext &Context,
-                                   CXXRecordDecl *Record,
-                                   CanQualType T) {
-  for (CXXRecordDecl::base_class_iterator I = Record->bases_begin(),
-         E = Record->bases_end(); I != E; ++I) {
-    CanQualType BaseT = Context.getCanonicalType((*I).getType());
-    if (BaseT == T)
-      return true;
-
-    // We have to recurse here to cover some really bizarre cases.
-    // Obviously, we can only have the dependent type as an indirect
-    // base class through a dependent base class, and usually it's
-    // impossible to know which instantiation a dependent base class
-    // will have.  But!  If we're actually *inside* the dependent base
-    // class, then we know its instantiation and can therefore be
-    // reasonably expected to look into it.
-
-    // template <class T> class A : Base<T> {
-    //   class Inner : A<T> {
-    //     void foo() {
-    //       Base<T>::foo(); // statically known to be an implicit member
-    //                          reference
-    //     }
-    //   };
-    // };
-
-    CanQual<RecordType> RT = BaseT->getAs<RecordType>();
-
-    // Base might be a dependent member type, in which case we
-    // obviously can't look into it.
-    if (!RT) continue;
-
-    CXXRecordDecl *BaseRecord = cast<CXXRecordDecl>(RT->getDecl());
-    if (BaseRecord->isDefinition() &&
-        HasDependentTypeAsBase(Context, BaseRecord, T))
-      return true;
-  }
-
-  return false;
-}
-
-/// Checks whether the given dependent nested-name specifier
-/// introduces an implicit member reference.  This is only true if the
-/// nested-name specifier names a type identical to one of the current
-/// instance method's context's (possibly indirect) base classes.
-static bool IsImplicitDependentMemberReference(Sema &SemaRef,
-                                               NestedNameSpecifier *Qualifier,
-                                               QualType &ThisType) {
-  // If the context isn't a C++ method, then it isn't an implicit
-  // member reference.
-  CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(SemaRef.CurContext);
-  if (!MD || MD->isStatic())
-    return false;
-
-  ASTContext &Context = SemaRef.Context;
-
-  // We want to check whether the method's context is known to inherit
-  // from the type named by the nested name specifier.  The trivial
-  // case here is:
-  //   template <class T> class Base { ... };
-  //   template <class T> class Derived : Base<T> {
-  //     void foo() {
-  //       Base<T>::foo();
-  //     }
-  //   };
-
-  QualType QT = GetTypeForQualifier(Context, Qualifier);
-  CanQualType T = Context.getCanonicalType(QT);
-
-  // And now, just walk the non-dependent type hierarchy, trying to
-  // find the given type as a literal base class.
-  CXXRecordDecl *Record = cast<CXXRecordDecl>(MD->getParent());
-  if (Context.getCanonicalType(Context.getTypeDeclType(Record)) == T || 
-      HasDependentTypeAsBase(Context, Record, T)) {
-    ThisType = MD->getThisType(Context);
-    return true;
-  }
-
-  return false;
-}
-
-/// ActOnDependentIdExpression - Handle a dependent declaration name
-/// that was just parsed.
+/// ActOnDependentIdExpression - Handle a dependent id-expression that
+/// was just parsed.  This is only possible with an explicit scope
+/// specifier naming a dependent type.
 Sema::OwningExprResult
 Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS,
                                  DeclarationName Name,
                                  SourceLocation NameLoc,
-                                 bool CheckForImplicitMember,
+                                 bool isAddressOfOperand,
                            const TemplateArgumentListInfo *TemplateArgs) {
   NestedNameSpecifier *Qualifier
     = static_cast<NestedNameSpecifier*>(SS.getScopeRep());
     
-  QualType ThisType;
-  if (CheckForImplicitMember &&
-      IsImplicitDependentMemberReference(*this, Qualifier, ThisType)) {
-    Expr *This = new (Context) CXXThisExpr(SourceLocation(), ThisType);
-
+  if (!isAddressOfOperand &&
+      isa<CXXMethodDecl>(CurContext) &&
+      cast<CXXMethodDecl>(CurContext)->isInstance()) {
+    QualType ThisType = cast<CXXMethodDecl>(CurContext)->getThisType(Context);
+    
     // Since the 'this' expression is synthesized, we don't need to
     // perform the double-lookup check.
     NamedDecl *FirstQualifierInScope = 0;
 
-    return Owned(CXXDependentScopeMemberExpr::Create(Context, This, true,
+    return Owned(CXXDependentScopeMemberExpr::Create(Context,
+                                                     /*This*/ 0, ThisType,
+                                                     /*IsArrow*/ true,
                                                      /*Op*/ SourceLocation(),
                                                      Qualifier, SS.getRange(),
                                                      FirstQualifierInScope,
@@ -426,10 +330,10 @@ static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef,
   
   switch (Arg.getKind()) {
   case ParsedTemplateArgument::Type: {
-    DeclaratorInfo *DI;
+    TypeSourceInfo *DI;
     QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI);
     if (!DI) 
-      DI = SemaRef.Context.getTrivialDeclaratorInfo(T, Arg.getLocation());
+      DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation());
     return TemplateArgumentLoc(TemplateArgument(T), DI);
   }
     
@@ -447,7 +351,7 @@ static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef,
   }
   }
   
-  llvm::llvm_unreachable("Unhandled parsed template argument");
+  llvm_unreachable("Unhandled parsed template argument");
   return TemplateArgumentLoc();
 }
                                                      
@@ -515,10 +419,10 @@ void Sema::ActOnTypeParameterDefault(DeclPtrTy TypeParam,
   TemplateTypeParmDecl *Parm
     = cast<TemplateTypeParmDecl>(TypeParam.getAs<Decl>());
 
-  DeclaratorInfo *DefaultDInfo;
-  GetTypeFromParser(DefaultT, &DefaultDInfo);
+  TypeSourceInfo *DefaultTInfo;
+  GetTypeFromParser(DefaultT, &DefaultTInfo);
 
-  assert(DefaultDInfo && "expected source information for type");
+  assert(DefaultTInfo && "expected source information for type");
 
   // C++0x [temp.param]p9:
   // A default template-argument may be specified for any kind of
@@ -533,12 +437,12 @@ void Sema::ActOnTypeParameterDefault(DeclPtrTy TypeParam,
   // FIXME: Implement this check! Needs a recursive walk over the types.
 
   // Check the template argument itself.
-  if (CheckTemplateArgument(Parm, DefaultDInfo)) {
+  if (CheckTemplateArgument(Parm, DefaultTInfo)) {
     Parm->setInvalidDecl();
     return;
   }
 
-  Parm->setDefaultArgument(DefaultDInfo, false);
+  Parm->setDefaultArgument(DefaultTInfo, false);
 }
 
 /// \brief Check that the type of a non-type template parameter is
@@ -592,8 +496,8 @@ Sema::CheckNonTypeTemplateParameterType(QualType T, SourceLocation Loc) {
 Sema::DeclPtrTy Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
                                                     unsigned Depth,
                                                     unsigned Position) {
-  DeclaratorInfo *DInfo = 0;
-  QualType T = GetTypeForDeclarator(D, S, &DInfo);
+  TypeSourceInfo *TInfo = 0;
+  QualType T = GetTypeForDeclarator(D, S, &TInfo);
 
   assert(S->isTemplateParamScope() &&
          "Non-type template parameter not in template parameter scope!");
@@ -615,7 +519,7 @@ Sema::DeclPtrTy Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
 
   NonTypeTemplateParmDecl *Param
     = NonTypeTemplateParmDecl::Create(Context, CurContext, D.getIdentifierLoc(),
-                                      Depth, Position, ParamName, T, DInfo);
+                                      Depth, Position, ParamName, T, TInfo);
   if (Invalid)
     Param->setInvalidDecl();
 
@@ -1266,8 +1170,27 @@ Sema::MatchTemplateParametersToScopeSpecifier(SourceLocation DeclStartLoc,
     ExplicitSpecializationsInSpecifier;
   for (NestedNameSpecifier *NNS = (NestedNameSpecifier *)SS.getScopeRep();
        NNS; NNS = NNS->getPrefix()) {
+    const Type *T = NNS->getAsType();
+    if (!T) break;
+
+    // C++0x [temp.expl.spec]p17:
+    //   A member or a member template may be nested within many
+    //   enclosing class templates. In an explicit specialization for
+    //   such a member, the member declaration shall be preceded by a
+    //   template<> for each enclosing class template that is
+    //   explicitly specialized.
+    // We interpret this as forbidding typedefs of template
+    // specializations in the scope specifiers of out-of-line decls.
+    if (const TypedefType *TT = dyn_cast<TypedefType>(T)) {
+      const Type *UnderlyingT = TT->LookThroughTypedefs().getTypePtr();
+      if (isa<TemplateSpecializationType>(UnderlyingT))
+        // FIXME: better source location information.
+        Diag(DeclStartLoc, diag::err_typedef_in_def_scope) << QualType(T,0);
+      T = UnderlyingT;
+    }
+
     if (const TemplateSpecializationType *SpecType
-          = dyn_cast_or_null<TemplateSpecializationType>(NNS->getAsType())) {
+          = dyn_cast<TemplateSpecializationType>(T)) {
       TemplateDecl *Template = SpecType->getTemplateName().getAsTemplateDecl();
       if (!Template)
         continue; // FIXME: should this be an error? probably...
@@ -1481,7 +1404,7 @@ Sema::ActOnTemplateIdType(TemplateTy TemplateD, SourceLocation TemplateLoc,
   if (Result.isNull())
     return true;
 
-  DeclaratorInfo *DI = Context.CreateDeclaratorInfo(Result);
+  TypeSourceInfo *DI = Context.CreateTypeSourceInfo(Result);
   TemplateSpecializationTypeLoc TL
     = cast<TemplateSpecializationTypeLoc>(DI->getTypeLoc());
   TL.setTemplateNameLoc(TemplateLoc);
@@ -1501,7 +1424,7 @@ Sema::TypeResult Sema::ActOnTagTemplateIdType(TypeResult TypeResult,
     return Sema::TypeResult();
 
   // FIXME: preserve source info, ideally without copying the DI.
-  DeclaratorInfo *DI;
+  TypeSourceInfo *DI;
   QualType Type = GetTypeFromParser(TypeResult.get(), &DI);
 
   // Verify the tag specifier.
@@ -1687,7 +1610,7 @@ bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
     return true;
   }
 
-  if (CheckTemplateArgument(Param, AL.getSourceDeclaratorInfo()))
+  if (CheckTemplateArgument(Param, AL.getTypeSourceInfo()))
     return true;
 
   // Add the converted template type argument.
@@ -1718,14 +1641,14 @@ bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
 /// parameters that precede \p Param in the template parameter list.
 ///
 /// \returns the substituted template argument, or NULL if an error occurred.
-static DeclaratorInfo *
+static TypeSourceInfo *
 SubstDefaultTemplateArgument(Sema &SemaRef,
                              TemplateDecl *Template,
                              SourceLocation TemplateLoc,
                              SourceLocation RAngleLoc,
                              TemplateTypeParmDecl *Param,
                              TemplateArgumentListBuilder &Converted) {
-  DeclaratorInfo *ArgType = Param->getDefaultArgumentInfo();
+  TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo();
 
   // If the argument type is dependent, instantiate it now based
   // on the previously-computed template arguments.
@@ -1851,7 +1774,7 @@ Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
     if (!TypeParm->hasDefaultArgument())
       return TemplateArgumentLoc();
 
-    DeclaratorInfo *DI = SubstDefaultTemplateArgument(*this, Template,
+    TypeSourceInfo *DI = SubstDefaultTemplateArgument(*this, Template,
                                                       TemplateLoc,
                                                       RAngleLoc,
                                                       TypeParm,
@@ -2012,7 +1935,7 @@ bool Sema::CheckTemplateArgument(NamedDecl *Param,
     }
       
     case TemplateArgument::Pack:
-      llvm::llvm_unreachable("Caller must expand template argument packs");
+      llvm_unreachable("Caller must expand template argument packs");
       break;
     }
     
@@ -2065,16 +1988,16 @@ bool Sema::CheckTemplateArgument(NamedDecl *Param,
     return true;
       
   case TemplateArgument::Declaration:
-    llvm::llvm_unreachable(
+    llvm_unreachable(
                        "Declaration argument with template template parameter");
     break;
   case TemplateArgument::Integral:
-    llvm::llvm_unreachable(
+    llvm_unreachable(
                           "Integral argument with template template parameter");
     break;
     
   case TemplateArgument::Pack:
-    llvm::llvm_unreachable("Caller must expand template argument packs");
+    llvm_unreachable("Caller must expand template argument packs");
     break;
   }
   
@@ -2168,7 +2091,7 @@ bool Sema::CheckTemplateArgumentList(TemplateDecl *Template,
         break;
       }
 
-      DeclaratorInfo *ArgType = SubstDefaultTemplateArgument(*this, 
+      TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this, 
                                                              Template,
                                                              TemplateLoc,
                                                              RAngleLoc,
@@ -2240,8 +2163,8 @@ bool Sema::CheckTemplateArgumentList(TemplateDecl *Template,
 /// This routine implements the semantics of C++ [temp.arg.type]. It
 /// returns true if an error occurred, and false otherwise.
 bool Sema::CheckTemplateArgument(TemplateTypeParmDecl *Param,
-                                 DeclaratorInfo *ArgInfo) {
-  assert(ArgInfo && "invalid DeclaratorInfo");
+                                 TypeSourceInfo *ArgInfo) {
+  assert(ArgInfo && "invalid TypeSourceInfo");
   QualType Arg = ArgInfo->getType();
 
   // C++ [temp.arg.type]p2:
@@ -4469,8 +4392,7 @@ Sema::DeclResult Sema::ActOnExplicitInstantiation(Scope *S,
   if (D.getDeclSpec().isInlineSpecified() && getLangOptions().CPlusPlus0x)
     Diag(D.getDeclSpec().getInlineSpecLoc(), 
          diag::err_explicit_instantiation_inline)
-      << CodeModificationHint::CreateRemoval(
-                              SourceRange(D.getDeclSpec().getInlineSpecLoc()));
+      <<CodeModificationHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
   
   // FIXME: check for constexpr specifier.
   
@@ -4493,8 +4415,7 @@ Sema::DeclResult Sema::ActOnExplicitInstantiation(Scope *S,
     if (Previous.isAmbiguous())
       return true;
     
-    VarDecl *Prev = dyn_cast_or_null<VarDecl>(
-        Previous.getAsSingleDecl(Context));
+    VarDecl *Prev = Previous.getAsSingle<VarDecl>();
     if (!Prev || !Prev->isStaticDataMember()) {
       // We expect to see a data data member here.
       Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_not_known)
@@ -4793,7 +4714,7 @@ Sema::CheckTypenameType(NestedNameSpecifier *NNS, const IdentifierInfo &II,
     break;
 
   case LookupResult::FoundUnresolvedValue:
-    llvm::llvm_unreachable("unresolved using decl in non-dependent context");
+    llvm_unreachable("unresolved using decl in non-dependent context");
     return QualType();
 
   case LookupResult::FoundOverloaded:
diff --git a/lib/Sema/SemaTemplateDeduction.cpp b/lib/Sema/SemaTemplateDeduction.cpp
index 613ffde..b4754db 100644
--- a/lib/Sema/SemaTemplateDeduction.cpp
+++ b/lib/Sema/SemaTemplateDeduction.cpp
@@ -2361,6 +2361,7 @@ MarkUsedTemplateParameters(Sema &SemaRef, QualType T,
   case Type::Enum:
   case Type::ObjCInterface:
   case Type::ObjCObjectPointer:
+  case Type::UnresolvedUsing:
 #define TYPE(Class, Base)
 #define ABSTRACT_TYPE(Class, Base)
 #define DEPENDENT_TYPE(Class, Base)
diff --git a/lib/Sema/SemaTemplateInstantiate.cpp b/lib/Sema/SemaTemplateInstantiate.cpp
index 623cde8..dddb93c8 100644
--- a/lib/Sema/SemaTemplateInstantiate.cpp
+++ b/lib/Sema/SemaTemplateInstantiate.cpp
@@ -544,7 +544,7 @@ namespace {
     /// \brief Rebuild the exception declaration and register the declaration
     /// as an instantiated local.
     VarDecl *RebuildExceptionDecl(VarDecl *ExceptionDecl, QualType T,
-                                  DeclaratorInfo *Declarator,
+                                  TypeSourceInfo *Declarator,
                                   IdentifierInfo *Name,
                                   SourceLocation Loc, SourceRange TypeRange);
 
@@ -552,13 +552,10 @@ namespace {
     /// elaborated type.
     QualType RebuildElaboratedType(QualType T, ElaboratedType::TagKind Tag);
 
-    Sema::OwningExprResult TransformPredefinedExpr(PredefinedExpr *E,
-                                                   bool isAddressOfOperand);
-    Sema::OwningExprResult TransformDeclRefExpr(DeclRefExpr *E,
-                                                bool isAddressOfOperand);
+    Sema::OwningExprResult TransformPredefinedExpr(PredefinedExpr *E);
+    Sema::OwningExprResult TransformDeclRefExpr(DeclRefExpr *E);
 
-    Sema::OwningExprResult TransformCXXDefaultArgExpr(CXXDefaultArgExpr *E,
-                                                      bool isAddressOfOperand);
+    Sema::OwningExprResult TransformCXXDefaultArgExpr(CXXDefaultArgExpr *E);
 
     /// \brief Transforms a template type parameter type by performing
     /// substitution of the corresponding template type argument.
@@ -632,7 +629,7 @@ TemplateInstantiator::TransformFirstQualifierInScope(NamedDecl *D,
 VarDecl *
 TemplateInstantiator::RebuildExceptionDecl(VarDecl *ExceptionDecl,
                                            QualType T,
-                                           DeclaratorInfo *Declarator,
+                                           TypeSourceInfo *Declarator,
                                            IdentifierInfo *Name,
                                            SourceLocation Loc,
                                            SourceRange TypeRange) {
@@ -670,8 +667,7 @@ TemplateInstantiator::RebuildElaboratedType(QualType T,
 }
 
 Sema::OwningExprResult 
-TemplateInstantiator::TransformPredefinedExpr(PredefinedExpr *E,
-                                              bool isAddressOfOperand) {
+TemplateInstantiator::TransformPredefinedExpr(PredefinedExpr *E) {
   if (!E->isTypeDependent())
     return SemaRef.Owned(E->Retain());
 
@@ -694,8 +690,7 @@ TemplateInstantiator::TransformPredefinedExpr(PredefinedExpr *E,
 }
 
 Sema::OwningExprResult
-TemplateInstantiator::TransformDeclRefExpr(DeclRefExpr *E,
-                                           bool isAddressOfOperand) {
+TemplateInstantiator::TransformDeclRefExpr(DeclRefExpr *E) {
   // FIXME: Clean this up a bit
   NamedDecl *D = E->getDecl();
   if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) {
@@ -782,29 +777,11 @@ TemplateInstantiator::TransformDeclRefExpr(DeclRefExpr *E,
     // FindInstantiatedDecl will find it in the local instantiation scope.
   }
 
-  NamedDecl *InstD = SemaRef.FindInstantiatedDecl(D, TemplateArgs);
-  if (!InstD)
-    return SemaRef.ExprError();
-
-  assert(!isa<UsingDecl>(InstD) && "decl ref instantiated to UsingDecl");
-
-  CXXScopeSpec SS;
-  NestedNameSpecifier *Qualifier = 0;
-  if (E->getQualifier()) {
-    Qualifier = TransformNestedNameSpecifier(E->getQualifier(),
-                                             E->getQualifierRange());
-    if (!Qualifier)
-      return SemaRef.ExprError();
-    
-    SS.setScopeRep(Qualifier);
-    SS.setRange(E->getQualifierRange());
-  }
-  
-  return SemaRef.BuildDeclarationNameExpr(SS, E->getLocation(), InstD);
+  return TreeTransform<TemplateInstantiator>::TransformDeclRefExpr(E);
 }
 
 Sema::OwningExprResult TemplateInstantiator::TransformCXXDefaultArgExpr(
-    CXXDefaultArgExpr *E, bool isAddressOfOperand) {
+    CXXDefaultArgExpr *E) {
   assert(!cast<FunctionDecl>(E->getParam()->getDeclContext())->
              getDescribedFunctionTemplate() &&
          "Default arg expressions are never formed in dependent cases.");
@@ -889,7 +866,7 @@ TemplateInstantiator::TransformTemplateTypeParmType(TypeLocBuilder &TLB,
 ///
 /// \returns If the instantiation succeeds, the instantiated
 /// type. Otherwise, produces diagnostics and returns a NULL type.
-DeclaratorInfo *Sema::SubstType(DeclaratorInfo *T,
+TypeSourceInfo *Sema::SubstType(TypeSourceInfo *T,
                                 const MultiLevelTemplateArgumentList &Args,
                                 SourceLocation Loc,
                                 DeclarationName Entity) {
@@ -936,6 +913,13 @@ Sema::SubstBaseSpecifiers(CXXRecordDecl *Instantiation,
          Base = Pattern->bases_begin(), BaseEnd = Pattern->bases_end();
        Base != BaseEnd; ++Base) {
     if (!Base->getType()->isDependentType()) {
+      const CXXRecordDecl *BaseDecl =
+        cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
+      
+      // Make sure to set the attributes from the base.
+      SetClassDeclAttributesFromBase(Instantiation, BaseDecl, 
+                                     Base->isVirtual());
+      
       InstantiatedBases.push_back(new (Context) CXXBaseSpecifier(*Base));
       continue;
     }
@@ -1053,12 +1037,10 @@ Sema::InstantiateClass(SourceLocation PointOfInstantiation,
        Member != MemberEnd; ++Member) {
     Decl *NewMember = SubstDecl(*Member, Instantiation, TemplateArgs);
     if (NewMember) {
-      if (NewMember->isInvalidDecl()) {
-        Invalid = true;
-      } else if (FieldDecl *Field = dyn_cast<FieldDecl>(NewMember))
+      if (FieldDecl *Field = dyn_cast<FieldDecl>(NewMember))
         Fields.push_back(DeclPtrTy::make(Field));
-      else if (UsingDecl *UD = dyn_cast<UsingDecl>(NewMember))
-        Instantiation->addDecl(UD);
+      else if (NewMember->isInvalidDecl())
+        Invalid = true;
     } else {
       // FIXME: Eventually, a NULL return will mean that one of the
       // instantiations was a semantic disaster, and we'll want to set Invalid =
@@ -1070,13 +1052,10 @@ Sema::InstantiateClass(SourceLocation PointOfInstantiation,
   ActOnFields(0, Instantiation->getLocation(), DeclPtrTy::make(Instantiation),
               Fields.data(), Fields.size(), SourceLocation(), SourceLocation(),
               0);
+  CheckCompletedCXXClass(Instantiation);
   if (Instantiation->isInvalidDecl())
     Invalid = true;
   
-  // Add any implicitly-declared members that we might need.
-  if (!Invalid)
-    AddImplicitlyDeclaredMembersToClass(Instantiation);
-
   // Exit the scope of this instantiation.
   CurContext = PreviousContext;
 
diff --git a/lib/Sema/SemaTemplateInstantiateDecl.cpp b/lib/Sema/SemaTemplateInstantiateDecl.cpp
index a125857..8d74bd7 100644
--- a/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -16,6 +16,7 @@
 #include "clang/AST/DeclTemplate.h"
 #include "clang/AST/DeclVisitor.h"
 #include "clang/AST/Expr.h"
+#include "clang/AST/ExprCXX.h"
 #include "clang/Basic/PrettyStackTrace.h"
 #include "clang/Lex/Preprocessor.h"
 
@@ -66,6 +67,8 @@ namespace {
     Decl *VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
     Decl *VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
     Decl *VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
+    Decl *VisitUsingDecl(UsingDecl *D);
+    Decl *VisitUsingShadowDecl(UsingShadowDecl *D);
     Decl *VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
     Decl *VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
 
@@ -125,13 +128,13 @@ TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) {
 
 Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) {
   bool Invalid = false;
-  DeclaratorInfo *DI = D->getTypeDeclaratorInfo();
+  TypeSourceInfo *DI = D->getTypeSourceInfo();
   if (DI->getType()->isDependentType()) {
     DI = SemaRef.SubstType(DI, TemplateArgs,
                            D->getLocation(), D->getDeclName());
     if (!DI) {
       Invalid = true;
-      DI = SemaRef.Context.getTrivialDeclaratorInfo(SemaRef.Context.IntTy);
+      DI = SemaRef.Context.getTrivialTypeSourceInfo(SemaRef.Context.IntTy);
     }
   }
 
@@ -147,9 +150,38 @@ Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) {
   return Typedef;
 }
 
+/// \brief Instantiate the arguments provided as part of initialization.
+///
+/// \returns true if an error occurred, false otherwise.
+static bool InstantiateInitializationArguments(Sema &SemaRef,
+                                               Expr **Args, unsigned NumArgs,
+                           const MultiLevelTemplateArgumentList &TemplateArgs,
+                         llvm::SmallVectorImpl<SourceLocation> &FakeCommaLocs,
+                           ASTOwningVector<&ActionBase::DeleteExpr> &InitArgs) {
+  for (unsigned I = 0; I != NumArgs; ++I) {
+    // When we hit the first defaulted argument, break out of the loop:
+    // we don't pass those default arguments on.
+    if (Args[I]->isDefaultArgument())
+      break;
+  
+    Sema::OwningExprResult Arg = SemaRef.SubstExpr(Args[I], TemplateArgs);
+    if (Arg.isInvalid())
+      return true;
+  
+    Expr *ArgExpr = (Expr *)Arg.get();
+    InitArgs.push_back(Arg.release());
+    
+    // FIXME: We're faking all of the comma locations. Do we need them?
+    FakeCommaLocs.push_back(
+                          SemaRef.PP.getLocForEndOfToken(ArgExpr->getLocEnd()));
+  }
+  
+  return false;
+}
+
 Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) {
   // Do substitution on the type of the declaration
-  DeclaratorInfo *DI = SemaRef.SubstType(D->getDeclaratorInfo(),
+  TypeSourceInfo *DI = SemaRef.SubstType(D->getTypeSourceInfo(),
                                          TemplateArgs,
                                          D->getTypeSpecStartLoc(),
                                          D->getDeclName());
@@ -193,48 +225,82 @@ Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) {
                                                      TSK_ImplicitInstantiation);
   
   if (D->getInit()) {
-    OwningExprResult Init
-      = SemaRef.SubstExpr(D->getInit(), TemplateArgs);
-    if (Init.isInvalid())
-      Var->setInvalidDecl();
-    else if (!D->getType()->isDependentType() &&
-             !D->getInit()->isTypeDependent() &&
-             !D->getInit()->isValueDependent()) {
-      // If neither the declaration's type nor its initializer are dependent,
-      // we don't want to redo all the checking, especially since the
-      // initializer might have been wrapped by a CXXConstructExpr since we did
-      // it the first time.
-      Var->setType(D->getType());
-      Var->setInit(SemaRef.Context, Init.takeAs<Expr>());
-    }
-    else if (ParenListExpr *PLE = dyn_cast<ParenListExpr>((Expr *)Init.get())) {
-      // FIXME: We're faking all of the comma locations, which is suboptimal.
-      // Do we even need these comma locations?
-      llvm::SmallVector<SourceLocation, 4> FakeCommaLocs;
-      if (PLE->getNumExprs() > 0) {
-        FakeCommaLocs.reserve(PLE->getNumExprs() - 1);
-        for (unsigned I = 0, N = PLE->getNumExprs() - 1; I != N; ++I) {
-          Expr *E = PLE->getExpr(I)->Retain();
-          FakeCommaLocs.push_back(
-                                SemaRef.PP.getLocForEndOfToken(E->getLocEnd()));
-        }
-        PLE->getExpr(PLE->getNumExprs() - 1)->Retain();
+    if (Var->isStaticDataMember() && !D->isOutOfLine())
+      SemaRef.PushExpressionEvaluationContext(Sema::Unevaluated);
+    else
+      SemaRef.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated);
+
+    // Extract the initializer, skipping through any temporary-binding 
+    // expressions and look at the subexpression as it was written.
+    Expr *DInit = D->getInit();
+    while (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(DInit))
+      DInit = Binder->getSubExpr();
+    if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(DInit))
+      DInit = ICE->getSubExprAsWritten();
+        
+    if (ParenListExpr *PLE = dyn_cast<ParenListExpr>(DInit)) {
+      // The initializer is a parenthesized list of expressions that is
+      // type-dependent. Instantiate each of the expressions; we'll be 
+      // performing direct initialization with them.
+      llvm::SmallVector<SourceLocation, 4> CommaLocs;
+      ASTOwningVector<&ActionBase::DeleteExpr> InitArgs(SemaRef);
+      if (!InstantiateInitializationArguments(SemaRef, 
+                                              PLE->getExprs(), 
+                                              PLE->getNumExprs(),
+                                              TemplateArgs,
+                                              CommaLocs, InitArgs)) {
+        // Add the direct initializer to the declaration.
+        SemaRef.AddCXXDirectInitializerToDecl(Sema::DeclPtrTy::make(Var),
+                                              PLE->getLParenLoc(),
+                                              move_arg(InitArgs),
+                                              CommaLocs.data(),
+                                              PLE->getRParenLoc());
       }
+    } else if (CXXConstructExpr *Construct =dyn_cast<CXXConstructExpr>(DInit)) {
+      // The initializer resolved to a constructor. Instantiate the constructor
+      // arguments.
+      llvm::SmallVector<SourceLocation, 4> CommaLocs;
+      ASTOwningVector<&ActionBase::DeleteExpr> InitArgs(SemaRef);
+      
+      if (!InstantiateInitializationArguments(SemaRef, 
+                                              Construct->getArgs(),
+                                              Construct->getNumArgs(),
+                                              TemplateArgs,
+                                              CommaLocs, InitArgs)) {
+        if (D->hasCXXDirectInitializer()) {
+          SourceLocation FakeLParenLoc = 
+            SemaRef.PP.getLocForEndOfToken(D->getLocation());
+          SourceLocation FakeRParenLoc = CommaLocs.empty()? FakeLParenLoc
+                                                          : CommaLocs.back();
+          SemaRef.AddCXXDirectInitializerToDecl(Sema::DeclPtrTy::make(Var),
+                                                FakeLParenLoc,
+                                                move_arg(InitArgs),
+                                                CommaLocs.data(),
+                                                FakeRParenLoc);          
+        } else if (InitArgs.size() == 1) {
+          Expr *Init = (Expr*)(InitArgs.take()[0]);
+          SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var), 
+                                       SemaRef.Owned(Init),
+                                       false);
+        } else {
+          assert(InitArgs.size() == 0);
+          SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false);          
+        }
+      } 
+    } else {
+      OwningExprResult Init
+        = SemaRef.SubstExpr(D->getInit(), TemplateArgs);
 
-      // Add the direct initializer to the declaration.
-      SemaRef.AddCXXDirectInitializerToDecl(Sema::DeclPtrTy::make(Var),
-                                            PLE->getLParenLoc(),
-                                            Sema::MultiExprArg(SemaRef,
-                                                       (void**)PLE->getExprs(),
-                                                           PLE->getNumExprs()),
-                                            FakeCommaLocs.data(),
-                                            PLE->getRParenLoc());
-
-      // When Init is destroyed, it will destroy the instantiated ParenListExpr;
-      // we've explicitly retained all of its subexpressions already.
-    } else
-      SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var), move(Init),
-                                   D->hasCXXDirectInitializer());
+      // FIXME: Not happy about invalidating decls just because of a bad 
+      // initializer, unless it affects the type.
+      if (Init.isInvalid())
+        Var->setInvalidDecl();
+      else
+        SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var), move(Init),
+                                     D->hasCXXDirectInitializer());
+    }
+    
+    SemaRef.PopExpressionEvaluationContext();
   } else if (!Var->isStaticDataMember() || Var->isOutOfLine())
     SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false);
 
@@ -243,12 +309,12 @@ Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) {
 
 Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) {
   bool Invalid = false;
-  DeclaratorInfo *DI = D->getDeclaratorInfo();
+  TypeSourceInfo *DI = D->getTypeSourceInfo();
   if (DI->getType()->isDependentType())  {
     DI = SemaRef.SubstType(DI, TemplateArgs,
                            D->getLocation(), D->getDeclName());
     if (!DI) {
-      DI = D->getDeclaratorInfo();
+      DI = D->getTypeSourceInfo();
       Invalid = true;
     } else if (DI->getType()->isFunctionType()) {
       // C++ [temp.arg.type]p3:
@@ -561,7 +627,12 @@ TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
   InstTemplate->setAccess(D->getAccess());
   assert(InstTemplate && 
          "VisitFunctionDecl/CXXMethodDecl didn't create a template!");
-  if (!InstTemplate->getInstantiatedFromMemberTemplate())
+
+  // Link the instantiation back to the pattern *unless* this is a
+  // non-definition friend declaration.
+  if (!InstTemplate->getInstantiatedFromMemberTemplate() &&
+      !(InstTemplate->getFriendObjectKind() &&
+        !D->getTemplatedDecl()->isThisDeclarationADefinition()))
     InstTemplate->setInstantiatedFromMemberTemplate(D);
   
   // Add non-friends into the owner.
@@ -638,7 +709,7 @@ Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) {
                                                     TemplateArgs);
   FunctionDecl *Function =
       FunctionDecl::Create(SemaRef.Context, DC, D->getLocation(),
-                           D->getDeclName(), T, D->getDeclaratorInfo(),
+                           D->getDeclName(), T, D->getTypeSourceInfo(),
                            D->getStorageClass(),
                            D->isInlineSpecified(), D->hasWrittenPrototype());
   Function->setLexicalDeclContext(Owner);
@@ -700,7 +771,8 @@ Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) {
       Previous.clear();
   }
   
-  SemaRef.CheckFunctionDeclaration(Function, Previous, false, Redeclaration,
+  SemaRef.CheckFunctionDeclaration(/*Scope*/ 0, Function, Previous,
+                                   false, Redeclaration,
                                    /*FIXME:*/OverloadableAttrRequired);
 
   // If the original function was part of a friend declaration,
@@ -771,7 +843,7 @@ TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D,
     Method = CXXConstructorDecl::Create(SemaRef.Context, Record,
                                         Constructor->getLocation(),
                                         Name, T,
-                                        Constructor->getDeclaratorInfo(),
+                                        Constructor->getTypeSourceInfo(),
                                         Constructor->isExplicit(),
                                         Constructor->isInlineSpecified(), false);
   } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
@@ -789,12 +861,12 @@ TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D,
                                                                       ConvTy);
     Method = CXXConversionDecl::Create(SemaRef.Context, Record,
                                        Conversion->getLocation(), Name,
-                                       T, Conversion->getDeclaratorInfo(),
+                                       T, Conversion->getTypeSourceInfo(),
                                        Conversion->isInlineSpecified(),
                                        Conversion->isExplicit());
   } else {
     Method = CXXMethodDecl::Create(SemaRef.Context, Record, D->getLocation(),
-                                   D->getDeclName(), T, D->getDeclaratorInfo(),
+                                   D->getDeclName(), T, D->getTypeSourceInfo(),
                                    D->isStatic(), D->isInlineSpecified());
   }
 
@@ -860,15 +932,16 @@ TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D,
 
   bool Redeclaration = false;
   bool OverloadableAttrRequired = false;
-  SemaRef.CheckFunctionDeclaration(Method, Previous, false, Redeclaration,
+  SemaRef.CheckFunctionDeclaration(0, Method, Previous, false, Redeclaration,
                                    /*FIXME:*/OverloadableAttrRequired);
 
+  if (D->isPure())
+    SemaRef.CheckPureMethod(Method, SourceRange());
+
   if (!FunctionTemplate && (!Method->isInvalidDecl() || Previous.empty()) &&
       !Method->getFriendObjectKind())
     Owner->addDecl(Method);
 
-  SemaRef.AddOverriddenMethods(Record, Method);
-
   return Method;
 }
 
@@ -886,7 +959,7 @@ Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) {
 
 ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) {
   QualType T;
-  DeclaratorInfo *DI = D->getDeclaratorInfo();
+  TypeSourceInfo *DI = D->getTypeSourceInfo();
   if (DI) {
     DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(),
                            D->getDeclName());
@@ -948,7 +1021,7 @@ Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl(
                                                  NonTypeTemplateParmDecl *D) {
   // Substitute into the type of the non-type template parameter.
   QualType T;
-  DeclaratorInfo *DI = D->getDeclaratorInfo();
+  TypeSourceInfo *DI = D->getTypeSourceInfo();
   if (DI) {
     DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(),
                            D->getDeclName());
@@ -1027,6 +1100,80 @@ Decl *TemplateDeclInstantiator::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
   return Inst;
 }
 
+Decl *TemplateDeclInstantiator::VisitUsingDecl(UsingDecl *D) {
+  // The nested name specifier is non-dependent, so no transformation
+  // is required.
+
+  // We only need to do redeclaration lookups if we're in a class
+  // scope (in fact, it's not really even possible in non-class
+  // scopes).
+  bool CheckRedeclaration = Owner->isRecord();
+
+  LookupResult Prev(SemaRef, D->getDeclName(), D->getLocation(),
+                    Sema::LookupUsingDeclName, Sema::ForRedeclaration);
+
+  UsingDecl *NewUD = UsingDecl::Create(SemaRef.Context, Owner,
+                                       D->getLocation(),
+                                       D->getNestedNameRange(),
+                                       D->getUsingLocation(),
+                                       D->getTargetNestedNameDecl(),
+                                       D->getDeclName(),
+                                       D->isTypeName());
+
+  CXXScopeSpec SS;
+  SS.setScopeRep(D->getTargetNestedNameDecl());
+  SS.setRange(D->getNestedNameRange());
+
+  if (CheckRedeclaration) {
+    Prev.setHideTags(false);
+    SemaRef.LookupQualifiedName(Prev, Owner);
+
+    // Check for invalid redeclarations.
+    if (SemaRef.CheckUsingDeclRedeclaration(D->getUsingLocation(),
+                                            D->isTypeName(), SS,
+                                            D->getLocation(), Prev))
+      NewUD->setInvalidDecl();
+
+  }
+
+  if (!NewUD->isInvalidDecl() &&
+      SemaRef.CheckUsingDeclQualifier(D->getUsingLocation(), SS,
+                                      D->getLocation()))
+    NewUD->setInvalidDecl();
+
+  SemaRef.Context.setInstantiatedFromUsingDecl(NewUD, D);
+  NewUD->setAccess(D->getAccess());
+  Owner->addDecl(NewUD);
+
+  // Don't process the shadow decls for an invalid decl.
+  if (NewUD->isInvalidDecl())
+    return NewUD;
+
+  // Process the shadow decls.
+  for (UsingDecl::shadow_iterator I = D->shadow_begin(), E = D->shadow_end();
+         I != E; ++I) {
+    UsingShadowDecl *Shadow = *I;
+    NamedDecl *InstTarget =
+      cast<NamedDecl>(SemaRef.FindInstantiatedDecl(Shadow->getTargetDecl(),
+                                                   TemplateArgs));
+
+    if (CheckRedeclaration &&
+        SemaRef.CheckUsingShadowDecl(NewUD, InstTarget, Prev))
+      continue;
+
+    UsingShadowDecl *InstShadow
+      = SemaRef.BuildUsingShadowDecl(/*Scope*/ 0, NewUD, InstTarget);
+    SemaRef.Context.setInstantiatedFromUsingShadowDecl(InstShadow, Shadow);
+  }
+
+  return NewUD;
+}
+
+Decl *TemplateDeclInstantiator::VisitUsingShadowDecl(UsingShadowDecl *D) {
+  // Ignore these;  we handle them in bulk when processing the UsingDecl.
+  return 0;
+}
+
 Decl * TemplateDeclInstantiator
     ::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
   NestedNameSpecifier *NNS =
@@ -1047,8 +1194,8 @@ Decl * TemplateDeclInstantiator
                                   /*instantiation*/ true,
                                   /*typename*/ true, D->getTypenameLoc());
   if (UD)
-    SemaRef.Context.setInstantiatedFromUnresolvedUsingDecl(cast<UsingDecl>(UD),
-                                                           D);
+    SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D);
+
   return UD;
 }
 
@@ -1072,8 +1219,8 @@ Decl * TemplateDeclInstantiator
                                   /*instantiation*/ true,
                                   /*typename*/ false, SourceLocation());
   if (UD)
-    SemaRef.Context.setInstantiatedFromUnresolvedUsingDecl(cast<UsingDecl>(UD),
-                                                           D);
+    SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D);
+
   return UD;
 }
 
@@ -1336,6 +1483,43 @@ TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New,
     }
   }
 
+  const FunctionProtoType *Proto = Tmpl->getType()->getAs<FunctionProtoType>();
+  assert(Proto && "Function template without prototype?");
+
+  if (Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec() ||
+      Proto->getNoReturnAttr()) {
+    // The function has an exception specification or a "noreturn"
+    // attribute. Substitute into each of the exception types.
+    llvm::SmallVector<QualType, 4> Exceptions;
+    for (unsigned I = 0, N = Proto->getNumExceptions(); I != N; ++I) {
+      // FIXME: Poor location information!
+      QualType T
+        = SemaRef.SubstType(Proto->getExceptionType(I), TemplateArgs,
+                            New->getLocation(), New->getDeclName());
+      if (T.isNull() || 
+          SemaRef.CheckSpecifiedExceptionType(T, New->getLocation()))
+        continue;
+
+      Exceptions.push_back(T);
+    }
+
+    // Rebuild the function type 
+
+    const FunctionProtoType *NewProto
+      = New->getType()->getAs<FunctionProtoType>();
+    assert(NewProto && "Template instantiation without function prototype?");
+    New->setType(SemaRef.Context.getFunctionType(NewProto->getResultType(),
+                                                 NewProto->arg_type_begin(),
+                                                 NewProto->getNumArgs(),
+                                                 NewProto->isVariadic(),
+                                                 NewProto->getTypeQuals(),
+                                                 Proto->hasExceptionSpec(),
+                                                 Proto->hasAnyExceptionSpec(),
+                                                 Exceptions.size(),
+                                                 Exceptions.data(),
+                                                 Proto->getNoReturnAttr()));
+  }
+
   return false;
 }
 
@@ -1352,17 +1536,8 @@ TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New,
 
   CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner);
   New->setAccess(Tmpl->getAccess());
-  if (Tmpl->isVirtualAsWritten()) {
-    New->setVirtualAsWritten(true);
-    Record->setAggregate(false);
-    Record->setPOD(false);
-    Record->setEmpty(false);
-    Record->setPolymorphic(true);
-  }
-  if (Tmpl->isPure()) {
-    New->setPure();
-    Record->setAbstract(true);
-  }
+  if (Tmpl->isVirtualAsWritten())
+    Record->setMethodAsVirtual(New);
 
   // FIXME: attributes
   // FIXME: New needs a pointer to Tmpl
@@ -1623,14 +1798,19 @@ Sema::InstantiateMemInitializers(CXXConstructorDecl *New,
     MemInitResult NewInit;
 
     if (Init->isBaseInitializer()) {
-      QualType BaseType(Init->getBaseClass(), 0);
-      BaseType = SubstType(BaseType, TemplateArgs, Init->getSourceLocation(),
-                           New->getDeclName());
-
-      NewInit = BuildBaseInitializer(BaseType,
+      TypeSourceInfo *BaseTInfo = SubstType(Init->getBaseClassInfo(), 
+                                            TemplateArgs, 
+                                            Init->getSourceLocation(), 
+                                            New->getDeclName());
+      if (!BaseTInfo) {
+        New->setInvalidDecl();
+        continue;
+      }
+      
+      NewInit = BuildBaseInitializer(BaseTInfo->getType(), BaseTInfo,
                                      (Expr **)NewArgs.data(),
                                      NewArgs.size(),
-                                     Init->getSourceLocation(),
+                                     Init->getLParenLoc(),
                                      Init->getRParenLoc(),
                                      New->getParent());
     } else if (Init->isMemberInitializer()) {
@@ -1646,6 +1826,7 @@ Sema::InstantiateMemInitializers(CXXConstructorDecl *New,
       NewInit = BuildMemberInitializer(Member, (Expr **)NewArgs.data(),
                                        NewArgs.size(),
                                        Init->getSourceLocation(),
+                                       Init->getLParenLoc(),
                                        Init->getRParenLoc());
     }
 
@@ -1749,16 +1930,28 @@ static bool isInstantiationOf(EnumDecl *Pattern,
   return false;
 }
 
+static bool isInstantiationOf(UsingShadowDecl *Pattern,
+                              UsingShadowDecl *Instance,
+                              ASTContext &C) {
+  return C.getInstantiatedFromUsingShadowDecl(Instance) == Pattern;
+}
+
+static bool isInstantiationOf(UsingDecl *Pattern,
+                              UsingDecl *Instance,
+                              ASTContext &C) {
+  return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
+}
+
 static bool isInstantiationOf(UnresolvedUsingValueDecl *Pattern,
                               UsingDecl *Instance,
                               ASTContext &C) {
-  return C.getInstantiatedFromUnresolvedUsingDecl(Instance) == Pattern;
+  return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
 }
 
 static bool isInstantiationOf(UnresolvedUsingTypenameDecl *Pattern,
                               UsingDecl *Instance,
                               ASTContext &C) {
-  return C.getInstantiatedFromUnresolvedUsingDecl(Instance) == Pattern;
+  return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
 }
 
 static bool isInstantiationOfStaticDataMember(VarDecl *Pattern,
@@ -1776,6 +1969,8 @@ static bool isInstantiationOfStaticDataMember(VarDecl *Pattern,
   return false;
 }
 
+// Other is the prospective instantiation
+// D is the prospective pattern
 static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) {
   if (D->getKind() != Other->getKind()) {
     if (UnresolvedUsingTypenameDecl *UUD
@@ -1827,6 +2022,12 @@ static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) {
     }
   }
 
+  if (UsingDecl *Using = dyn_cast<UsingDecl>(Other))
+    return isInstantiationOf(cast<UsingDecl>(D), Using, Ctx);
+
+  if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(Other))
+    return isInstantiationOf(cast<UsingShadowDecl>(D), Shadow, Ctx);
+
   return D->getDeclName() && isa<NamedDecl>(Other) &&
     D->getDeclName() == cast<NamedDecl>(Other)->getDeclName();
 }
@@ -1979,7 +2180,10 @@ NamedDecl *Sema::FindInstantiatedDecl(NamedDecl *D,
                                    ParentDC->decls_end());
     }
 
-    assert(Result && "Unable to find instantiation of declaration!");
+    // UsingShadowDecls can instantiate to nothing because of using hiding.
+    assert((Result || isa<UsingShadowDecl>(D))
+           && "Unable to find instantiation of declaration!");
+
     D = Result;
   }
 
diff --git a/lib/Sema/SemaType.cpp b/lib/Sema/SemaType.cpp
index afce5e3..37f19f2 100644
--- a/lib/Sema/SemaType.cpp
+++ b/lib/Sema/SemaType.cpp
@@ -356,10 +356,14 @@ static QualType ConvertDeclSpecToType(Declarator &TheDeclarator, Sema &TheSema){
     // or incomplete types shall not be restrict-qualified."  C++ also allows
     // restrict-qualified references.
     if (TypeQuals & DeclSpec::TQ_restrict) {
-      if (Result->isPointerType() || Result->isReferenceType()) {
-        QualType EltTy = Result->isPointerType() ?
-          Result->getAs<PointerType>()->getPointeeType() :
-          Result->getAs<ReferenceType>()->getPointeeType();
+      if (Result->isAnyPointerType() || Result->isReferenceType()) {
+        QualType EltTy;
+        if (Result->isObjCObjectPointerType())
+          EltTy = Result;
+        else
+          EltTy = Result->isPointerType() ?
+                    Result->getAs<PointerType>()->getPointeeType() :
+                    Result->getAs<ReferenceType>()->getPointeeType();
 
         // If we have a pointer or reference, the pointee must have an object
         // incomplete type.
@@ -846,20 +850,20 @@ QualType Sema::BuildBlockPointerType(QualType T, unsigned CVR,
   return Context.getQualifiedType(Context.getBlockPointerType(T), Quals);
 }
 
-QualType Sema::GetTypeFromParser(TypeTy *Ty, DeclaratorInfo **DInfo) {
+QualType Sema::GetTypeFromParser(TypeTy *Ty, TypeSourceInfo **TInfo) {
   QualType QT = QualType::getFromOpaquePtr(Ty);
   if (QT.isNull()) {
-    if (DInfo) *DInfo = 0;
+    if (TInfo) *TInfo = 0;
     return QualType();
   }
 
-  DeclaratorInfo *DI = 0;
+  TypeSourceInfo *DI = 0;
   if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) {
     QT = LIT->getType();
-    DI = LIT->getDeclaratorInfo();
+    DI = LIT->getTypeSourceInfo();
   }
 
-  if (DInfo) *DInfo = DI;
+  if (TInfo) *TInfo = DI;
   return QT;
 }
 
@@ -870,7 +874,7 @@ QualType Sema::GetTypeFromParser(TypeTy *Ty, DeclaratorInfo **DInfo) {
 /// owns the declaration of a type (e.g., the definition of a struct
 /// type), then *OwnedDecl will receive the owned declaration.
 QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S,
-                                    DeclaratorInfo **DInfo,
+                                    TypeSourceInfo **TInfo,
                                     TagDecl **OwnedDecl) {
   // Determine the type of the declarator. Not all forms of declarator
   // have a type.
@@ -897,6 +901,9 @@ QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S,
     break;
   }
   
+  if (T.isNull())
+    return T;
+
   if (T == Context.UndeducedAutoTy) {
     int Error = -1;
 
@@ -1186,7 +1193,7 @@ QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S,
 
         case NestedNameSpecifier::Namespace:
         case NestedNameSpecifier::Global:
-          llvm::llvm_unreachable("Nested-name-specifier must name a type");
+          llvm_unreachable("Nested-name-specifier must name a type");
           break;
             
         case NestedNameSpecifier::TypeSpec:
@@ -1256,11 +1263,11 @@ QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S,
   if (const AttributeList *Attrs = D.getAttributes())
     ProcessTypeAttributeList(T, Attrs);
 
-  if (DInfo) {
+  if (TInfo) {
     if (D.isInvalidType())
-      *DInfo = 0;
+      *TInfo = 0;
     else
-      *DInfo = GetDeclaratorInfoForDeclarator(D, T);
+      *TInfo = GetTypeSourceInfoForDeclarator(D, T);
   }
 
   return T;
@@ -1326,18 +1333,18 @@ namespace {
       }
     }
     void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) {
-      DeclaratorInfo *DInfo = 0;
-      Sema::GetTypeFromParser(DS.getTypeRep(), &DInfo);
+      TypeSourceInfo *TInfo = 0;
+      Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo);
 
       // If we got no declarator info from previous Sema routines,
       // just fill with the typespec loc.
-      if (!DInfo) {
+      if (!TInfo) {
         TL.initialize(DS.getTypeSpecTypeLoc());
         return;
       }
 
       TemplateSpecializationTypeLoc OldTL =
-        cast<TemplateSpecializationTypeLoc>(DInfo->getTypeLoc());
+        cast<TemplateSpecializationTypeLoc>(TInfo->getTypeLoc());
       TL.copy(OldTL);
     }
     void VisitTypeLoc(TypeLoc TL) {
@@ -1353,7 +1360,7 @@ namespace {
     DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {}
 
     void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
-      llvm::llvm_unreachable("qualified type locs not expected here!");
+      llvm_unreachable("qualified type locs not expected here!");
     }
 
     void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
@@ -1408,18 +1415,18 @@ namespace {
     }
 
     void VisitTypeLoc(TypeLoc TL) {
-      llvm::llvm_unreachable("unsupported TypeLoc kind in declarator!");
+      llvm_unreachable("unsupported TypeLoc kind in declarator!");
     }
   };
 }
 
-/// \brief Create and instantiate a DeclaratorInfo with type source information.
+/// \brief Create and instantiate a TypeSourceInfo with type source information.
 ///
 /// \param T QualType referring to the type as written in source code.
-DeclaratorInfo *
-Sema::GetDeclaratorInfoForDeclarator(Declarator &D, QualType T) {
-  DeclaratorInfo *DInfo = Context.CreateDeclaratorInfo(T);
-  UnqualTypeLoc CurrTL = DInfo->getTypeLoc().getUnqualifiedLoc();
+TypeSourceInfo *
+Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T) {
+  TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T);
+  UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc();
 
   for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
     DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL);
@@ -1428,16 +1435,16 @@ Sema::GetDeclaratorInfoForDeclarator(Declarator &D, QualType T) {
   
   TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL);
 
-  return DInfo;
+  return TInfo;
 }
 
-/// \brief Create a LocInfoType to hold the given QualType and DeclaratorInfo.
-QualType Sema::CreateLocInfoType(QualType T, DeclaratorInfo *DInfo) {
+/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo.
+QualType Sema::CreateLocInfoType(QualType T, TypeSourceInfo *TInfo) {
   // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser
   // and Sema during declaration parsing. Try deallocating/caching them when
   // it's appropriate, instead of allocating them and keeping them around.
   LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8);
-  new (LocT) LocInfoType(T, DInfo);
+  new (LocT) LocInfoType(T, TInfo);
   assert(LocT->getTypeClass() != T->getTypeClass() &&
          "LocInfoType's TypeClass conflicts with an existing Type class");
   return QualType(LocT, 0);
@@ -1512,9 +1519,9 @@ Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) {
   // the parser.
   assert(D.getIdentifier() == 0 && "Type name should have no identifier!");
 
-  DeclaratorInfo *DInfo = 0;
+  TypeSourceInfo *TInfo = 0;
   TagDecl *OwnedTag = 0;
-  QualType T = GetTypeForDeclarator(D, S, &DInfo, &OwnedTag);
+  QualType T = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag);
   if (D.isInvalidType())
     return true;
 
@@ -1531,8 +1538,8 @@ Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) {
         << Context.getTypeDeclType(OwnedTag);
   }
 
-  if (DInfo)
-    T = CreateLocInfoType(T, DInfo);
+  if (TInfo)
+    T = CreateLocInfoType(T, TInfo);
 
   return T.getAsOpaquePtr();
 }
@@ -1640,6 +1647,53 @@ static void HandleNoReturnTypeAttribute(QualType &Type,
   Type = S.Context.getNoReturnType(Type);
 }
 
+/// HandleVectorSizeAttribute - this attribute is only applicable to integral
+/// and float scalars, although arrays, pointers, and function return values are
+/// allowed in conjunction with this construct. Aggregates with this attribute
+/// are invalid, even if they are of the same size as a corresponding scalar.
+/// The raw attribute should contain precisely 1 argument, the vector size for
+/// the variable, measured in bytes. If curType and rawAttr are well formed,
+/// this routine will return a new vector type.
+static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, Sema &S) {
+  // Check the attribute arugments.
+  if (Attr.getNumArgs() != 1) {
+    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
+    return;
+  }
+  Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0));
+  llvm::APSInt vecSize(32);
+  if (!sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) {
+    S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
+      << "vector_size" << sizeExpr->getSourceRange();
+    return;
+  }
+  // the base type must be integer or float, and can't already be a vector.
+  if (CurType->isVectorType() ||
+      (!CurType->isIntegerType() && !CurType->isRealFloatingType())) {
+    S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
+    return;
+  }
+  unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
+  // vecSize is specified in bytes - convert to bits.
+  unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8);
+
+  // the vector size needs to be an integral multiple of the type size.
+  if (vectorSize % typeSize) {
+    S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size)
+      << sizeExpr->getSourceRange();
+    return;
+  }
+  if (vectorSize == 0) {
+    S.Diag(Attr.getLoc(), diag::err_attribute_zero_size)
+      << sizeExpr->getSourceRange();
+    return;
+  }
+
+  // Success! Instantiate the vector type, the number of elements is > 0, and
+  // not required to be a power of 2, unlike GCC.
+  CurType = S.Context.getVectorType(CurType, vectorSize/typeSize);
+}
+
 void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) {
   // Scan through and apply attributes to this type where it makes sense.  Some
   // attributes (such as __address_space__, __vector_size__, etc) apply to the
@@ -1659,6 +1713,9 @@ void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) {
     case AttributeList::AT_noreturn:
       HandleNoReturnTypeAttribute(Result, *AL, *this);
       break;
+    case AttributeList::AT_vector_size:
+      HandleVectorSizeAttr(Result, *AL, *this);
+      break;
     }
   }
 }
diff --git a/lib/Sema/TreeTransform.h b/lib/Sema/TreeTransform.h
index 28b2174..fd19987 100644
--- a/lib/Sema/TreeTransform.h
+++ b/lib/Sema/TreeTransform.h
@@ -172,13 +172,23 @@ public:
     return T.isNull();
   }
 
+  /// \brief Determine whether the given call argument should be dropped, e.g.,
+  /// because it is a default argument.
+  ///
+  /// Subclasses can provide an alternative implementation of this routine to
+  /// determine which kinds of call arguments get dropped. By default,
+  /// CXXDefaultArgument nodes are dropped (prior to transformation).
+  bool DropCallArgument(Expr *E) {
+    return E->isDefaultArgument();
+  }
+  
   /// \brief Transforms the given type into another type.
   ///
   /// By default, this routine transforms a type by creating a
-  /// DeclaratorInfo for it and delegating to the appropriate
+  /// TypeSourceInfo for it and delegating to the appropriate
   /// function.  This is expensive, but we don't mind, because
   /// this method is deprecated anyway;  all users should be
-  /// switched to storing DeclaratorInfos.
+  /// switched to storing TypeSourceInfos.
   ///
   /// \returns the transformed type.
   QualType TransformType(QualType T);
@@ -191,7 +201,7 @@ public:
   /// may override this function (to take over all type
   /// transformations) or some set of the TransformXXXType functions
   /// to alter the transformation.
-  DeclaratorInfo *TransformType(DeclaratorInfo *DI);
+  TypeSourceInfo *TransformType(TypeSourceInfo *DI);
 
   /// \brief Transform the given type-with-location into a new
   /// type, collecting location information in the given builder
@@ -218,19 +228,7 @@ public:
   /// other mechanism.
   ///
   /// \returns the transformed expression.
-  OwningExprResult TransformExpr(Expr *E) {
-    return getDerived().TransformExpr(E, /*isAddressOfOperand=*/false);
-  }
-
-  /// \brief Transform the given expression.
-  ///
-  /// By default, this routine transforms an expression by delegating to the
-  /// appropriate TransformXXXExpr function to build a new expression.
-  /// Subclasses may override this function to transform expressions using some
-  /// other mechanism.
-  ///
-  /// \returns the transformed expression.
-  OwningExprResult TransformExpr(Expr *E, bool isAddressOfOperand);
+  OwningExprResult TransformExpr(Expr *E);
 
   /// \brief Transform the given declaration, which is referenced from a type
   /// or expression.
@@ -301,9 +299,9 @@ public:
   void InventTemplateArgumentLoc(const TemplateArgument &Arg,
                                  TemplateArgumentLoc &ArgLoc);
 
-  /// \brief Fakes up a DeclaratorInfo for a type.
-  DeclaratorInfo *InventDeclaratorInfo(QualType T) {
-    return SemaRef.Context.getTrivialDeclaratorInfo(T,
+  /// \brief Fakes up a TypeSourceInfo for a type.
+  TypeSourceInfo *InventTypeSourceInfo(QualType T) {
+    return SemaRef.Context.getTrivialTypeSourceInfo(T,
                        getDerived().getBaseLocation());
   }
 
@@ -328,7 +326,7 @@ public:
 #define STMT(Node, Parent)                        \
   OwningStmtResult Transform##Node(Node *S);
 #define EXPR(Node, Parent)                        \
-  OwningExprResult Transform##Node(Node *E, bool isAddressOfOperand);
+  OwningExprResult Transform##Node(Node *E);
 #define ABSTRACT_EXPR(Node, Parent)
 #include "clang/AST/StmtNodes.def"
 
@@ -461,6 +459,10 @@ public:
   /// \brief Build a new unprototyped function type.
   QualType RebuildFunctionNoProtoType(QualType ResultType);
 
+  /// \brief Rebuild an unresolved typename type, given the decl that
+  /// the UnresolvedUsingTypenameDecl was transformed to.
+  QualType RebuildUnresolvedUsingType(Decl *D);
+
   /// \brief Build a new typedef type.
   QualType RebuildTypedefType(TypedefDecl *Typedef) {
     return SemaRef.Context.getTypeDeclType(Typedef);
@@ -779,7 +781,7 @@ public:
   /// By default, performs semantic analysis to build the new decaration.
   /// Subclasses may override this routine to provide different behavior.
   VarDecl *RebuildExceptionDecl(VarDecl *ExceptionDecl, QualType T,
-                                DeclaratorInfo *Declarator,
+                                TypeSourceInfo *Declarator,
                                 IdentifierInfo *Name,
                                 SourceLocation Loc,
                                 SourceRange TypeRange) {
@@ -826,15 +828,15 @@ public:
   /// Subclasses may override this routine to provide different behavior.
   OwningExprResult RebuildDeclRefExpr(NestedNameSpecifier *Qualifier,
                                       SourceRange QualifierRange,
-                                      NamedDecl *ND, SourceLocation Loc,
-                                      bool isAddressOfOperand) {
+                                      ValueDecl *VD, SourceLocation Loc,
+                                      TemplateArgumentListInfo *TemplateArgs) {
     CXXScopeSpec SS;
     SS.setScopeRep(Qualifier);
     SS.setRange(QualifierRange);
-    return getSema().BuildDeclarationNameExpr(Loc, ND,
-                                              /*FIXME:*/false,
-                                              &SS,
-                                              isAddressOfOperand);
+
+    // FIXME: loses template args.
+    
+    return getSema().BuildDeclarationNameExpr(SS, Loc, VD);
   }
 
   /// \brief Build a new expression in parentheses.
@@ -863,11 +865,14 @@ public:
       SS.setScopeRep(Qualifier);
     }
 
+    QualType BaseType = ((Expr*) Base.get())->getType();
+
     DeclarationName Name
       = SemaRef.Context.DeclarationNames.getCXXDestructorName(
                                SemaRef.Context.getCanonicalType(DestroyedType));
 
-    return getSema().BuildMemberReferenceExpr(move(Base), OperatorLoc, isArrow,
+    return getSema().BuildMemberReferenceExpr(move(Base), BaseType,
+                                              OperatorLoc, isArrow,
                                               SS, /*FIXME: FirstQualifier*/ 0,
                                               Name, DestroyedTypeLoc,
                                               /*TemplateArgs*/ 0);
@@ -887,10 +892,10 @@ public:
   ///
   /// By default, performs semantic analysis to build the new expression.
   /// Subclasses may override this routine to provide different behavior.
-  OwningExprResult RebuildSizeOfAlignOf(DeclaratorInfo *DInfo,
+  OwningExprResult RebuildSizeOfAlignOf(TypeSourceInfo *TInfo,
                                         SourceLocation OpLoc,
                                         bool isSizeOf, SourceRange R) {
-    return getSema().CreateSizeOfAlignOfExpr(DInfo, OpLoc, isSizeOf, R);
+    return getSema().CreateSizeOfAlignOfExpr(TInfo, OpLoc, isSizeOf, R);
   }
 
   /// \brief Build a new sizeof or alignof expression with an expression
@@ -944,7 +949,7 @@ public:
                                      NestedNameSpecifier *Qualifier,
                                      SourceRange QualifierRange,
                                      SourceLocation MemberLoc,
-                                     NamedDecl *Member,
+                                     ValueDecl *Member,
                         const TemplateArgumentListInfo *ExplicitTemplateArgs,
                                      NamedDecl *FirstQualifierInScope) {
     if (!Member->getDeclName()) {
@@ -964,7 +969,11 @@ public:
       SS.setScopeRep(Qualifier);
     }
 
-    return getSema().BuildMemberReferenceExpr(move(Base), OpLoc, isArrow,
+    QualType BaseType = ((Expr*) Base.get())->getType();
+
+    // FIXME: wait, this is re-performing lookup?
+    return getSema().BuildMemberReferenceExpr(move(Base), BaseType,
+                                              OpLoc, isArrow,
                                               SS, FirstQualifierInScope,
                                               Member->getDeclName(), MemberLoc,
                                               ExplicitTemplateArgs);
@@ -994,19 +1003,6 @@ public:
                                         move(LHS), move(RHS));
   }
 
-  /// \brief Build a new implicit cast expression.
-  ///
-  /// By default, builds a new implicit cast without any semantic analysis.
-  /// Subclasses may override this routine to provide different behavior.
-  OwningExprResult RebuildImplicitCastExpr(QualType T, CastExpr::CastKind Kind,
-                                           ExprArg SubExpr, bool isLvalue) {
-    ImplicitCastExpr *ICE
-      = new (getSema().Context) ImplicitCastExpr(T, Kind,
-                                                 (Expr *)SubExpr.release(),
-                                                 isLvalue);
-    return getSema().Owned(ICE);
-  }
-
   /// \brief Build a new C-style cast expression.
   ///
   /// By default, performs semantic analysis to build the new expression.
@@ -1042,8 +1038,10 @@ public:
                                                SourceLocation OpLoc,
                                                SourceLocation AccessorLoc,
                                                IdentifierInfo &Accessor) {
+
     CXXScopeSpec SS;
-    return getSema().BuildMemberReferenceExpr(move(Base),
+    QualType BaseType = ((Expr*) Base.get())->getType();
+    return getSema().BuildMemberReferenceExpr(move(Base), BaseType,
                                               OpLoc, /*IsArrow*/ false,
                                               SS, /*FirstQualifierInScope*/ 0,
                                               DeclarationName(&Accessor),
@@ -1471,13 +1469,17 @@ public:
   /// By default, performs semantic analysis to build the new expression.
   /// Subclasses may override this routine to provide different behavior.
   OwningExprResult RebuildCXXConstructExpr(QualType T,
+                                           SourceLocation Loc,
                                            CXXConstructorDecl *Constructor,
                                            bool IsElidable,
                                            MultiExprArg Args) {
-    return getSema().BuildCXXConstructExpr(/*FIXME:ConstructLoc*/
-                                           SourceLocation(),
-                                           T, Constructor, IsElidable,
-                                           move(Args));
+    ASTOwningVector<&ActionBase::DeleteExpr> ConvertedArgs(SemaRef);
+    if (getSema().CompleteConstructorCall(Constructor, move(Args), Loc, 
+                                          ConvertedArgs))
+      return getSema().ExprError();
+    
+    return getSema().BuildCXXConstructExpr(Loc, T, Constructor, IsElidable,
+                                           move_arg(ConvertedArgs));
   }
 
   /// \brief Build a new object-construction expression.
@@ -1522,6 +1524,7 @@ public:
   /// By default, performs semantic analysis to build the new expression.
   /// Subclasses may override this routine to provide different behavior.
   OwningExprResult RebuildCXXDependentScopeMemberExpr(ExprArg BaseE,
+                                                  QualType BaseType,
                                                   bool IsArrow,
                                                   SourceLocation OperatorLoc,
                                               NestedNameSpecifier *Qualifier,
@@ -1534,7 +1537,8 @@ public:
     SS.setRange(QualifierRange);
     SS.setScopeRep(Qualifier);
 
-    return SemaRef.BuildMemberReferenceExpr(move(BaseE), OperatorLoc, IsArrow,
+    return SemaRef.BuildMemberReferenceExpr(move(BaseE), BaseType,
+                                            OperatorLoc, IsArrow,
                                             SS, FirstQualifierInScope,
                                             Name, MemberLoc, TemplateArgs);
   }
@@ -1544,19 +1548,19 @@ public:
   /// By default, performs semantic analysis to build the new expression.
   /// Subclasses may override this routine to provide different behavior.
   OwningExprResult RebuildUnresolvedMemberExpr(ExprArg BaseE,
+                                               QualType BaseType,
                                                SourceLocation OperatorLoc,
                                                bool IsArrow,
                                                NestedNameSpecifier *Qualifier,
                                                SourceRange QualifierRange,
                                                LookupResult &R,
                                 const TemplateArgumentListInfo *TemplateArgs) {
-    OwningExprResult Base = move(BaseE);
-
     CXXScopeSpec SS;
     SS.setRange(QualifierRange);
     SS.setScopeRep(Qualifier);
 
-    return SemaRef.BuildMemberReferenceExpr(move(Base), OperatorLoc, IsArrow,
+    return SemaRef.BuildMemberReferenceExpr(move(BaseE), BaseType,
+                                            OperatorLoc, IsArrow,
                                             SS, R, TemplateArgs);
   }
 
@@ -1660,8 +1664,7 @@ Sema::OwningStmtResult TreeTransform<Derived>::TransformStmt(Stmt *S) {
 
 
 template<typename Derived>
-Sema::OwningExprResult TreeTransform<Derived>::TransformExpr(Expr *E,
-                                                    bool isAddressOfOperand) {
+Sema::OwningExprResult TreeTransform<Derived>::TransformExpr(Expr *E) {
   if (!E)
     return SemaRef.Owned(E);
 
@@ -1669,8 +1672,7 @@ Sema::OwningExprResult TreeTransform<Derived>::TransformExpr(Expr *E,
     case Stmt::NoStmtClass: break;
 #define STMT(Node, Parent) case Stmt::Node##Class: break;
 #define EXPR(Node, Parent)                                              \
-    case Stmt::Node##Class: return getDerived().Transform##Node(cast<Node>(E), \
-                                                            isAddressOfOperand);
+    case Stmt::Node##Class: return getDerived().Transform##Node(cast<Node>(E));
 #include "clang/AST/StmtNodes.def"
   }
 
@@ -1870,12 +1872,12 @@ void TreeTransform<Derived>::InventTemplateArgumentLoc(
   SourceLocation Loc = getDerived().getBaseLocation();
   switch (Arg.getKind()) {
   case TemplateArgument::Null:
-    llvm::llvm_unreachable("null template argument in TreeTransform");
+    llvm_unreachable("null template argument in TreeTransform");
     break;
 
   case TemplateArgument::Type:
     Output = TemplateArgumentLoc(Arg,
-               SemaRef.Context.getTrivialDeclaratorInfo(Arg.getAsType(), Loc));
+               SemaRef.Context.getTrivialTypeSourceInfo(Arg.getAsType(), Loc));
                                             
     break;
 
@@ -1907,9 +1909,9 @@ bool TreeTransform<Derived>::TransformTemplateArgument(
     return false;
 
   case TemplateArgument::Type: {
-    DeclaratorInfo *DI = Input.getSourceDeclaratorInfo();
+    TypeSourceInfo *DI = Input.getTypeSourceInfo();
     if (DI == NULL)
-      DI = InventDeclaratorInfo(Input.getArgument().getAsType());
+      DI = InventTypeSourceInfo(Input.getArgument().getAsType());
 
     DI = getDerived().TransformType(DI);
     if (!DI) return true;
@@ -2016,10 +2018,10 @@ QualType TreeTransform<Derived>::TransformType(QualType T) {
 
   // Temporary workaround.  All of these transformations should
   // eventually turn into transformations on TypeLocs.
-  DeclaratorInfo *DI = getSema().Context.CreateDeclaratorInfo(T);
+  TypeSourceInfo *DI = getSema().Context.CreateTypeSourceInfo(T);
   DI->getTypeLoc().initialize(getDerived().getBaseLocation());
   
-  DeclaratorInfo *NewDI = getDerived().TransformType(DI);
+  TypeSourceInfo *NewDI = getDerived().TransformType(DI);
 
   if (!NewDI)
     return QualType();
@@ -2028,7 +2030,7 @@ QualType TreeTransform<Derived>::TransformType(QualType T) {
 }
 
 template<typename Derived>
-DeclaratorInfo *TreeTransform<Derived>::TransformType(DeclaratorInfo *DI) {
+TypeSourceInfo *TreeTransform<Derived>::TransformType(TypeSourceInfo *DI) {
   if (getDerived().AlreadyTransformed(DI->getType()))
     return DI;
 
@@ -2041,7 +2043,7 @@ DeclaratorInfo *TreeTransform<Derived>::TransformType(DeclaratorInfo *DI) {
   if (Result.isNull())
     return 0;
 
-  return TLB.getDeclaratorInfo(SemaRef.Context, Result);
+  return TLB.getTypeSourceInfo(SemaRef.Context, Result);
 }
 
 template<typename Derived>
@@ -2055,7 +2057,7 @@ TreeTransform<Derived>::TransformType(TypeLocBuilder &TLB, TypeLoc T) {
 #include "clang/AST/TypeLocNodes.def"
   }
 
-  llvm::llvm_unreachable("unhandled type loc!");
+  llvm_unreachable("unhandled type loc!");
   return QualType();
 }
 
@@ -2489,10 +2491,10 @@ TreeTransform<Derived>::TransformFunctionProtoType(TypeLocBuilder &TLB,
     ParmVarDecl *NewParm;
 
     if (OldParm) {
-      DeclaratorInfo *OldDI = OldParm->getDeclaratorInfo();
+      TypeSourceInfo *OldDI = OldParm->getTypeSourceInfo();
       assert(OldDI->getType() == T->getArgType(i));
 
-      DeclaratorInfo *NewDI = getDerived().TransformType(OldDI);
+      TypeSourceInfo *NewDI = getDerived().TransformType(OldDI);
       if (!NewDI)
         return QualType();
 
@@ -2567,6 +2569,29 @@ QualType TreeTransform<Derived>::TransformFunctionNoProtoType(
   return Result;
 }
 
+template<typename Derived> QualType
+TreeTransform<Derived>::TransformUnresolvedUsingType(TypeLocBuilder &TLB,
+                                                 UnresolvedUsingTypeLoc TL) {
+  UnresolvedUsingType *T = TL.getTypePtr();
+  Decl *D = getDerived().TransformDecl(T->getDecl());
+  if (!D)
+    return QualType();
+
+  QualType Result = TL.getType();
+  if (getDerived().AlwaysRebuild() || D != T->getDecl()) {
+    Result = getDerived().RebuildUnresolvedUsingType(D);
+    if (Result.isNull())
+      return QualType();
+  }
+
+  // We might get an arbitrary type spec type back.  We should at
+  // least always get a type spec type, though.
+  TypeSpecTypeLoc NewTL = TLB.pushTypeSpec(Result);
+  NewTL.setNameLoc(TL.getNameLoc());
+
+  return Result;
+}
+
 template<typename Derived>
 QualType TreeTransform<Derived>::TransformTypedefType(TypeLocBuilder &TLB,
                                                       TypedefTypeLoc TL) {
@@ -2622,7 +2647,7 @@ QualType TreeTransform<Derived>::TransformTypeOfType(TypeLocBuilder &TLB,
                                                      TypeOfTypeLoc TL) {
   TypeOfType *T = TL.getTypePtr();
 
-  // FIXME: should be an inner type, or at least have a DeclaratorInfo.
+  // FIXME: should be an inner type, or at least have a TypeSourceInfo.
   QualType Underlying = getDerived().TransformType(T->getUnderlyingType());
   if (Underlying.isNull())
     return QualType();
@@ -3364,7 +3389,7 @@ TreeTransform<Derived>::TransformCXXCatchStmt(CXXCatchStmt *S) {
 
     Var = getDerived().RebuildExceptionDecl(ExceptionDecl,
                                             T,
-                                            ExceptionDecl->getDeclaratorInfo(),
+                                            ExceptionDecl->getTypeSourceInfo(),
                                             ExceptionDecl->getIdentifier(),
                                             ExceptionDecl->getLocation(),
                                             /*FIXME: Inaccurate*/
@@ -3430,15 +3455,13 @@ TreeTransform<Derived>::TransformCXXTryStmt(CXXTryStmt *S) {
 //===----------------------------------------------------------------------===//
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformPredefinedExpr(PredefinedExpr *E,
-                                                bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformPredefinedExpr(PredefinedExpr *E) {
   return SemaRef.Owned(E->Retain());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformDeclRefExpr(DeclRefExpr *E,
-                                             bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformDeclRefExpr(DeclRefExpr *E) {
   NestedNameSpecifier *Qualifier = 0;
   if (E->getQualifier()) {
     Qualifier = getDerived().TransformNestedNameSpecifier(E->getQualifier(),
@@ -3446,72 +3469,74 @@ TreeTransform<Derived>::TransformDeclRefExpr(DeclRefExpr *E,
     if (!Qualifier)
       return SemaRef.ExprError();
   }
-  
-  NamedDecl *ND
-    = dyn_cast_or_null<NamedDecl>(getDerived().TransformDecl(E->getDecl()));
+
+  ValueDecl *ND
+    = cast_or_null<ValueDecl>(getDerived().TransformDecl(E->getDecl()));
   if (!ND)
     return SemaRef.ExprError();
 
   if (!getDerived().AlwaysRebuild() && 
       Qualifier == E->getQualifier() &&
       ND == E->getDecl() &&
-      !E->hasExplicitTemplateArgumentList())
-    return SemaRef.Owned(E->Retain());
+      !E->hasExplicitTemplateArgumentList()) {
 
-  // FIXME: We're losing the explicit template arguments in this transformation.
+    // Mark it referenced in the new context regardless.
+    // FIXME: this is a bit instantiation-specific.
+    SemaRef.MarkDeclarationReferenced(E->getLocation(), ND);
 
-  llvm::SmallVector<TemplateArgumentLoc, 4> TransArgs(E->getNumTemplateArgs());
-  for (unsigned I = 0, N = E->getNumTemplateArgs(); I != N; ++I) {
-    if (getDerived().TransformTemplateArgument(E->getTemplateArgs()[I],
-                                               TransArgs[I]))
-      return SemaRef.ExprError();
+    return SemaRef.Owned(E->Retain());
   }
-  
-  // FIXME: Pass the qualifier/qualifier range along.
+
+  TemplateArgumentListInfo TransArgs, *TemplateArgs = 0;
+  if (E->hasExplicitTemplateArgumentList()) {
+    TemplateArgs = &TransArgs;
+    TransArgs.setLAngleLoc(E->getLAngleLoc());
+    TransArgs.setRAngleLoc(E->getRAngleLoc());
+    for (unsigned I = 0, N = E->getNumTemplateArgs(); I != N; ++I) {
+      TemplateArgumentLoc Loc;
+      if (getDerived().TransformTemplateArgument(E->getTemplateArgs()[I], Loc))
+        return SemaRef.ExprError();
+      TransArgs.addArgument(Loc);
+    }
+  }
+
   return getDerived().RebuildDeclRefExpr(Qualifier, E->getQualifierRange(),
-                                         ND, E->getLocation(),
-                                         isAddressOfOperand);
+                                         ND, E->getLocation(), TemplateArgs);
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformIntegerLiteral(IntegerLiteral *E,
-                                                bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformIntegerLiteral(IntegerLiteral *E) {
   return SemaRef.Owned(E->Retain());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformFloatingLiteral(FloatingLiteral *E,
-                                                 bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformFloatingLiteral(FloatingLiteral *E) {
   return SemaRef.Owned(E->Retain());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformImaginaryLiteral(ImaginaryLiteral *E,
-                                                  bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformImaginaryLiteral(ImaginaryLiteral *E) {
   return SemaRef.Owned(E->Retain());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformStringLiteral(StringLiteral *E,
-                                               bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformStringLiteral(StringLiteral *E) {
   return SemaRef.Owned(E->Retain());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCharacterLiteral(CharacterLiteral *E,
-                                                  bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCharacterLiteral(CharacterLiteral *E) {
   return SemaRef.Owned(E->Retain());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformParenExpr(ParenExpr *E,
-                                           bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformParenExpr(ParenExpr *E) {
   OwningExprResult SubExpr = getDerived().TransformExpr(E->getSubExpr());
   if (SubExpr.isInvalid())
     return SemaRef.ExprError();
@@ -3525,10 +3550,8 @@ TreeTransform<Derived>::TransformParenExpr(ParenExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformUnaryOperator(UnaryOperator *E,
-                                               bool isAddressOfOperand) {
-  OwningExprResult SubExpr = getDerived().TransformExpr(E->getSubExpr(),
-                                       E->getOpcode() == UnaryOperator::AddrOf);
+TreeTransform<Derived>::TransformUnaryOperator(UnaryOperator *E) {
+  OwningExprResult SubExpr = getDerived().TransformExpr(E->getSubExpr());
   if (SubExpr.isInvalid())
     return SemaRef.ExprError();
 
@@ -3542,12 +3565,11 @@ TreeTransform<Derived>::TransformUnaryOperator(UnaryOperator *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformSizeOfAlignOfExpr(SizeOfAlignOfExpr *E,
-                                                   bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformSizeOfAlignOfExpr(SizeOfAlignOfExpr *E) {
   if (E->isArgumentType()) {
-    DeclaratorInfo *OldT = E->getArgumentTypeInfo();
+    TypeSourceInfo *OldT = E->getArgumentTypeInfo();
 
-    DeclaratorInfo *NewT = getDerived().TransformType(OldT);
+    TypeSourceInfo *NewT = getDerived().TransformType(OldT);
     if (!NewT)
       return SemaRef.ExprError();
 
@@ -3581,8 +3603,7 @@ TreeTransform<Derived>::TransformSizeOfAlignOfExpr(SizeOfAlignOfExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformArraySubscriptExpr(ArraySubscriptExpr *E,
-                                                    bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformArraySubscriptExpr(ArraySubscriptExpr *E) {
   OwningExprResult LHS = getDerived().TransformExpr(E->getLHS());
   if (LHS.isInvalid())
     return SemaRef.ExprError();
@@ -3605,8 +3626,7 @@ TreeTransform<Derived>::TransformArraySubscriptExpr(ArraySubscriptExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCallExpr(CallExpr *E,
-                                          bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCallExpr(CallExpr *E) {
   // Transform the callee.
   OwningExprResult Callee = getDerived().TransformExpr(E->getCallee());
   if (Callee.isInvalid())
@@ -3645,8 +3665,7 @@ TreeTransform<Derived>::TransformCallExpr(CallExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformMemberExpr(MemberExpr *E,
-                                            bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformMemberExpr(MemberExpr *E) {
   OwningExprResult Base = getDerived().TransformExpr(E->getBase());
   if (Base.isInvalid())
     return SemaRef.ExprError();
@@ -3660,8 +3679,8 @@ TreeTransform<Derived>::TransformMemberExpr(MemberExpr *E,
       return SemaRef.ExprError();
   }
 
-  NamedDecl *Member
-    = cast_or_null<NamedDecl>(getDerived().TransformDecl(E->getMemberDecl()));
+  ValueDecl *Member
+    = cast_or_null<ValueDecl>(getDerived().TransformDecl(E->getMemberDecl()));
   if (!Member)
     return SemaRef.ExprError();
 
@@ -3701,16 +3720,14 @@ TreeTransform<Derived>::TransformMemberExpr(MemberExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCastExpr(CastExpr *E,
-                                          bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCastExpr(CastExpr *E) {
   assert(false && "Cannot transform abstract class");
   return SemaRef.Owned(E->Retain());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformBinaryOperator(BinaryOperator *E,
-                                                bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformBinaryOperator(BinaryOperator *E) {
   OwningExprResult LHS = getDerived().TransformExpr(E->getLHS());
   if (LHS.isInvalid())
     return SemaRef.ExprError();
@@ -3731,15 +3748,13 @@ TreeTransform<Derived>::TransformBinaryOperator(BinaryOperator *E,
 template<typename Derived>
 Sema::OwningExprResult
 TreeTransform<Derived>::TransformCompoundAssignOperator(
-                                                      CompoundAssignOperator *E,
-                                                      bool isAddressOfOperand) {
-  return getDerived().TransformBinaryOperator(E, isAddressOfOperand);
+                                                      CompoundAssignOperator *E) {
+  return getDerived().TransformBinaryOperator(E);
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformConditionalOperator(ConditionalOperator *E,
-                                                     bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformConditionalOperator(ConditionalOperator *E) {
   OwningExprResult Cond = getDerived().TransformExpr(E->getCond());
   if (Cond.isInvalid())
     return SemaRef.ExprError();
@@ -3767,42 +3782,22 @@ TreeTransform<Derived>::TransformConditionalOperator(ConditionalOperator *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformImplicitCastExpr(ImplicitCastExpr *E,
-                                                  bool isAddressOfOperand) {
-  TemporaryBase Rebase(*this, E->getLocStart(), DeclarationName());
-
-  // FIXME: Will we ever have type information here? It seems like we won't,
-  // so do we even need to transform the type?
-  QualType T = getDerived().TransformType(E->getType());
-  if (T.isNull())
-    return SemaRef.ExprError();
-
-  OwningExprResult SubExpr = getDerived().TransformExpr(E->getSubExpr());
-  if (SubExpr.isInvalid())
-    return SemaRef.ExprError();
-
-  if (!getDerived().AlwaysRebuild() &&
-      T == E->getType() &&
-      SubExpr.get() == E->getSubExpr())
-    return SemaRef.Owned(E->Retain());
-
-  return getDerived().RebuildImplicitCastExpr(T, E->getCastKind(),
-                                              move(SubExpr),
-                                              E->isLvalueCast());
+TreeTransform<Derived>::TransformImplicitCastExpr(ImplicitCastExpr *E) {
+  // Implicit casts are eliminated during transformation, since they
+  // will be recomputed by semantic analysis after transformation.
+  return getDerived().TransformExpr(E->getSubExprAsWritten());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformExplicitCastExpr(ExplicitCastExpr *E,
-                                                  bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformExplicitCastExpr(ExplicitCastExpr *E) {
   assert(false && "Cannot transform abstract class");
   return SemaRef.Owned(E->Retain());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCStyleCastExpr(CStyleCastExpr *E,
-                                                bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCStyleCastExpr(CStyleCastExpr *E) {
   QualType T;
   {
     // FIXME: Source location isn't quite accurate.
@@ -3815,7 +3810,8 @@ TreeTransform<Derived>::TransformCStyleCastExpr(CStyleCastExpr *E,
       return SemaRef.ExprError();
   }
 
-  OwningExprResult SubExpr = getDerived().TransformExpr(E->getSubExpr());
+  OwningExprResult SubExpr
+    = getDerived().TransformExpr(E->getSubExprAsWritten());
   if (SubExpr.isInvalid())
     return SemaRef.ExprError();
 
@@ -3831,8 +3827,7 @@ TreeTransform<Derived>::TransformCStyleCastExpr(CStyleCastExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCompoundLiteralExpr(CompoundLiteralExpr *E,
-                                                     bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCompoundLiteralExpr(CompoundLiteralExpr *E) {
   QualType T;
   {
     // FIXME: Source location isn't quite accurate.
@@ -3861,8 +3856,7 @@ TreeTransform<Derived>::TransformCompoundLiteralExpr(CompoundLiteralExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformExtVectorElementExpr(ExtVectorElementExpr *E,
-                                                      bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformExtVectorElementExpr(ExtVectorElementExpr *E) {
   OwningExprResult Base = getDerived().TransformExpr(E->getBase());
   if (Base.isInvalid())
     return SemaRef.ExprError();
@@ -3881,8 +3875,7 @@ TreeTransform<Derived>::TransformExtVectorElementExpr(ExtVectorElementExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformInitListExpr(InitListExpr *E,
-                                              bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformInitListExpr(InitListExpr *E) {
   bool InitChanged = false;
 
   ASTOwningVector<&ActionBase::DeleteExpr, 4> Inits(SemaRef);
@@ -3904,8 +3897,7 @@ TreeTransform<Derived>::TransformInitListExpr(InitListExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformDesignatedInitExpr(DesignatedInitExpr *E,
-                                                    bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformDesignatedInitExpr(DesignatedInitExpr *E) {
   Designation Desig;
 
   // transform the initializer value
@@ -3974,8 +3966,7 @@ TreeTransform<Derived>::TransformDesignatedInitExpr(DesignatedInitExpr *E,
 template<typename Derived>
 Sema::OwningExprResult
 TreeTransform<Derived>::TransformImplicitValueInitExpr(
-                                                     ImplicitValueInitExpr *E,
-                                                     bool isAddressOfOperand) {
+                                                     ImplicitValueInitExpr *E) {
   TemporaryBase Rebase(*this, E->getLocStart(), DeclarationName());
   
   // FIXME: Will we ever have proper type location here? Will we actually
@@ -3993,8 +3984,7 @@ TreeTransform<Derived>::TransformImplicitValueInitExpr(
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformVAArgExpr(VAArgExpr *E,
-                                           bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformVAArgExpr(VAArgExpr *E) {
   // FIXME: Do we want the type as written?
   QualType T;
 
@@ -4021,8 +4011,7 @@ TreeTransform<Derived>::TransformVAArgExpr(VAArgExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformParenListExpr(ParenListExpr *E,
-                                               bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformParenListExpr(ParenListExpr *E) {
   bool ArgumentChanged = false;
   ASTOwningVector<&ActionBase::DeleteExpr, 4> Inits(SemaRef);
   for (unsigned I = 0, N = E->getNumExprs(); I != N; ++I) {
@@ -4046,16 +4035,14 @@ TreeTransform<Derived>::TransformParenListExpr(ParenListExpr *E,
 /// the corresponding label statement by semantic analysis.
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformAddrLabelExpr(AddrLabelExpr *E,
-                                               bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformAddrLabelExpr(AddrLabelExpr *E) {
   return getDerived().RebuildAddrLabelExpr(E->getAmpAmpLoc(), E->getLabelLoc(),
                                            E->getLabel());
 }
 
 template<typename Derived>
 Sema::OwningExprResult 
-TreeTransform<Derived>::TransformStmtExpr(StmtExpr *E, 
-                                          bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformStmtExpr(StmtExpr *E) {
   OwningStmtResult SubStmt
     = getDerived().TransformCompoundStmt(E->getSubStmt(), true);
   if (SubStmt.isInvalid())
@@ -4072,8 +4059,7 @@ TreeTransform<Derived>::TransformStmtExpr(StmtExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformTypesCompatibleExpr(TypesCompatibleExpr *E,
-                                                     bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformTypesCompatibleExpr(TypesCompatibleExpr *E) {
   QualType T1, T2;
   {
     // FIXME: Source location isn't quite accurate.
@@ -4099,8 +4085,7 @@ TreeTransform<Derived>::TransformTypesCompatibleExpr(TypesCompatibleExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformChooseExpr(ChooseExpr *E,
-                                            bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformChooseExpr(ChooseExpr *E) {
   OwningExprResult Cond = getDerived().TransformExpr(E->getCond());
   if (Cond.isInvalid())
     return SemaRef.ExprError();
@@ -4126,22 +4111,83 @@ TreeTransform<Derived>::TransformChooseExpr(ChooseExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformGNUNullExpr(GNUNullExpr *E,
-                                             bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformGNUNullExpr(GNUNullExpr *E) {
   return SemaRef.Owned(E->Retain());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXOperatorCallExpr(CXXOperatorCallExpr *E,
-                                                     bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCXXOperatorCallExpr(CXXOperatorCallExpr *E) {
+  switch (E->getOperator()) {
+  case OO_New:
+  case OO_Delete:
+  case OO_Array_New:
+  case OO_Array_Delete:
+    llvm_unreachable("new and delete operators cannot use CXXOperatorCallExpr");
+    return SemaRef.ExprError();
+    
+  case OO_Call: {
+    // This is a call to an object's operator().
+    assert(E->getNumArgs() >= 1 && "Object call is missing arguments");
+
+    // Transform the object itself.
+    OwningExprResult Object = getDerived().TransformExpr(E->getArg(0));
+    if (Object.isInvalid())
+      return SemaRef.ExprError();
+
+    // FIXME: Poor location information
+    SourceLocation FakeLParenLoc
+      = SemaRef.PP.getLocForEndOfToken(
+                              static_cast<Expr *>(Object.get())->getLocEnd());
+
+    // Transform the call arguments.
+    ASTOwningVector<&ActionBase::DeleteExpr> Args(SemaRef);
+    llvm::SmallVector<SourceLocation, 4> FakeCommaLocs;
+    for (unsigned I = 1, N = E->getNumArgs(); I != N; ++I) {
+      if (getDerived().DropCallArgument(E->getArg(I)))
+        break;
+      
+      OwningExprResult Arg = getDerived().TransformExpr(E->getArg(I));
+      if (Arg.isInvalid())
+        return SemaRef.ExprError();
+
+      // FIXME: Poor source location information.
+      SourceLocation FakeCommaLoc
+        = SemaRef.PP.getLocForEndOfToken(
+                                 static_cast<Expr *>(Arg.get())->getLocEnd());
+      FakeCommaLocs.push_back(FakeCommaLoc);
+      Args.push_back(Arg.release());
+    }
+
+    return getDerived().RebuildCallExpr(move(Object), FakeLParenLoc,
+                                        move_arg(Args),
+                                        FakeCommaLocs.data(),
+                                        E->getLocEnd());
+  }
+
+#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
+  case OO_##Name:
+#define OVERLOADED_OPERATOR_MULTI(Name,Spelling,Unary,Binary,MemberOnly)
+#include "clang/Basic/OperatorKinds.def"
+  case OO_Subscript:
+    // Handled below.
+    break;
+
+  case OO_Conditional:
+    llvm_unreachable("conditional operator is not actually overloadable");
+    return SemaRef.ExprError();
+
+  case OO_None:
+  case NUM_OVERLOADED_OPERATORS:
+    llvm_unreachable("not an overloaded operator?");
+    return SemaRef.ExprError();
+  }
+
   OwningExprResult Callee = getDerived().TransformExpr(E->getCallee());
   if (Callee.isInvalid())
     return SemaRef.ExprError();
 
-  OwningExprResult First 
-    = getDerived().TransformExpr(E->getArg(0),
-                           E->getNumArgs() == 1 && E->getOperator() == OO_Amp);
+  OwningExprResult First = getDerived().TransformExpr(E->getArg(0));
   if (First.isInvalid())
     return SemaRef.ExprError();
 
@@ -4167,15 +4213,13 @@ TreeTransform<Derived>::TransformCXXOperatorCallExpr(CXXOperatorCallExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXMemberCallExpr(CXXMemberCallExpr *E,
-                                                   bool isAddressOfOperand) {
-  return getDerived().TransformCallExpr(E, isAddressOfOperand);
+TreeTransform<Derived>::TransformCXXMemberCallExpr(CXXMemberCallExpr *E) {
+  return getDerived().TransformCallExpr(E);
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXNamedCastExpr(CXXNamedCastExpr *E,
-                                                  bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCXXNamedCastExpr(CXXNamedCastExpr *E) {
   QualType ExplicitTy;
   {
     // FIXME: Source location isn't quite accurate.
@@ -4188,7 +4232,8 @@ TreeTransform<Derived>::TransformCXXNamedCastExpr(CXXNamedCastExpr *E,
       return SemaRef.ExprError();
   }
 
-  OwningExprResult SubExpr = getDerived().TransformExpr(E->getSubExpr());
+  OwningExprResult SubExpr
+    = getDerived().TransformExpr(E->getSubExprAsWritten());
   if (SubExpr.isInvalid())
     return SemaRef.ExprError();
 
@@ -4216,38 +4261,33 @@ TreeTransform<Derived>::TransformCXXNamedCastExpr(CXXNamedCastExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXStaticCastExpr(CXXStaticCastExpr *E,
-                                                   bool isAddressOfOperand) {
-  return getDerived().TransformCXXNamedCastExpr(E, isAddressOfOperand);
+TreeTransform<Derived>::TransformCXXStaticCastExpr(CXXStaticCastExpr *E) {
+  return getDerived().TransformCXXNamedCastExpr(E);
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXDynamicCastExpr(CXXDynamicCastExpr *E,
-                                                    bool isAddressOfOperand) {
-  return getDerived().TransformCXXNamedCastExpr(E, isAddressOfOperand);
+TreeTransform<Derived>::TransformCXXDynamicCastExpr(CXXDynamicCastExpr *E) {
+  return getDerived().TransformCXXNamedCastExpr(E);
 }
 
 template<typename Derived>
 Sema::OwningExprResult
 TreeTransform<Derived>::TransformCXXReinterpretCastExpr(
-                                                      CXXReinterpretCastExpr *E,
-                                                      bool isAddressOfOperand) {
-  return getDerived().TransformCXXNamedCastExpr(E, isAddressOfOperand);
+                                                      CXXReinterpretCastExpr *E) {
+  return getDerived().TransformCXXNamedCastExpr(E);
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXConstCastExpr(CXXConstCastExpr *E,
-                                                  bool isAddressOfOperand) {
-  return getDerived().TransformCXXNamedCastExpr(E, isAddressOfOperand);
+TreeTransform<Derived>::TransformCXXConstCastExpr(CXXConstCastExpr *E) {
+  return getDerived().TransformCXXNamedCastExpr(E);
 }
 
 template<typename Derived>
 Sema::OwningExprResult
 TreeTransform<Derived>::TransformCXXFunctionalCastExpr(
-                                                     CXXFunctionalCastExpr *E,
-                                                     bool isAddressOfOperand) {
+                                                     CXXFunctionalCastExpr *E) {
   QualType ExplicitTy;
   {
     TemporaryBase Rebase(*this, E->getTypeBeginLoc(), DeclarationName());
@@ -4257,7 +4297,8 @@ TreeTransform<Derived>::TransformCXXFunctionalCastExpr(
       return SemaRef.ExprError();
   }
 
-  OwningExprResult SubExpr = getDerived().TransformExpr(E->getSubExpr());
+  OwningExprResult SubExpr
+    = getDerived().TransformExpr(E->getSubExprAsWritten());
   if (SubExpr.isInvalid())
     return SemaRef.ExprError();
 
@@ -4277,8 +4318,7 @@ TreeTransform<Derived>::TransformCXXFunctionalCastExpr(
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXTypeidExpr(CXXTypeidExpr *E,
-                                               bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCXXTypeidExpr(CXXTypeidExpr *E) {
   if (E->isTypeOperand()) {
     TemporaryBase Rebase(*this, /*FIXME*/E->getLocStart(), DeclarationName());
 
@@ -4318,23 +4358,20 @@ TreeTransform<Derived>::TransformCXXTypeidExpr(CXXTypeidExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXBoolLiteralExpr(CXXBoolLiteralExpr *E,
-                                                    bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCXXBoolLiteralExpr(CXXBoolLiteralExpr *E) {
   return SemaRef.Owned(E->Retain());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
 TreeTransform<Derived>::TransformCXXNullPtrLiteralExpr(
-                                                     CXXNullPtrLiteralExpr *E,
-                                                     bool isAddressOfOperand) {
+                                                     CXXNullPtrLiteralExpr *E) {
   return SemaRef.Owned(E->Retain());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXThisExpr(CXXThisExpr *E,
-                                             bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCXXThisExpr(CXXThisExpr *E) {
   TemporaryBase Rebase(*this, E->getLocStart(), DeclarationName());
 
   QualType T = getDerived().TransformType(E->getType());
@@ -4350,8 +4387,7 @@ TreeTransform<Derived>::TransformCXXThisExpr(CXXThisExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXThrowExpr(CXXThrowExpr *E,
-                                              bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCXXThrowExpr(CXXThrowExpr *E) {
   OwningExprResult SubExpr = getDerived().TransformExpr(E->getSubExpr());
   if (SubExpr.isInvalid())
     return SemaRef.ExprError();
@@ -4365,8 +4401,7 @@ TreeTransform<Derived>::TransformCXXThrowExpr(CXXThrowExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXDefaultArgExpr(CXXDefaultArgExpr *E,
-                                                   bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
   ParmVarDecl *Param
     = cast_or_null<ParmVarDecl>(getDerived().TransformDecl(E->getParam()));
   if (!Param)
@@ -4381,8 +4416,7 @@ TreeTransform<Derived>::TransformCXXDefaultArgExpr(CXXDefaultArgExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXZeroInitValueExpr(CXXZeroInitValueExpr *E,
-                                                      bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCXXZeroInitValueExpr(CXXZeroInitValueExpr *E) {
   TemporaryBase Rebase(*this, E->getTypeBeginLoc(), DeclarationName());
 
   QualType T = getDerived().TransformType(E->getType());
@@ -4401,8 +4435,7 @@ TreeTransform<Derived>::TransformCXXZeroInitValueExpr(CXXZeroInitValueExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXNewExpr(CXXNewExpr *E,
-                                            bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCXXNewExpr(CXXNewExpr *E) {
   // Transform the type that we're allocating
   TemporaryBase Rebase(*this, E->getLocStart(), DeclarationName());
   QualType AllocType = getDerived().TransformType(E->getAllocatedType());
@@ -4460,8 +4493,7 @@ TreeTransform<Derived>::TransformCXXNewExpr(CXXNewExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXDeleteExpr(CXXDeleteExpr *E,
-                                               bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCXXDeleteExpr(CXXDeleteExpr *E) {
   OwningExprResult Operand = getDerived().TransformExpr(E->getArgument());
   if (Operand.isInvalid())
     return SemaRef.ExprError();
@@ -4479,8 +4511,7 @@ TreeTransform<Derived>::TransformCXXDeleteExpr(CXXDeleteExpr *E,
 template<typename Derived>
 Sema::OwningExprResult
 TreeTransform<Derived>::TransformCXXPseudoDestructorExpr(
-                                                     CXXPseudoDestructorExpr *E,
-                                                     bool isAddressOfOperand) {
+                                                     CXXPseudoDestructorExpr *E) {
   OwningExprResult Base = getDerived().TransformExpr(E->getBase());
   if (Base.isInvalid())
     return SemaRef.ExprError();
@@ -4517,8 +4548,7 @@ TreeTransform<Derived>::TransformCXXPseudoDestructorExpr(
 template<typename Derived>
 Sema::OwningExprResult
 TreeTransform<Derived>::TransformUnresolvedLookupExpr(
-                                                  UnresolvedLookupExpr *Old,
-                                                  bool isAddressOfOperand) {
+                                                  UnresolvedLookupExpr *Old) {
   TemporaryBase Rebase(*this, Old->getNameLoc(), DeclarationName());
 
   LookupResult R(SemaRef, Old->getName(), Old->getNameLoc(),
@@ -4528,8 +4558,14 @@ TreeTransform<Derived>::TransformUnresolvedLookupExpr(
   for (UnresolvedLookupExpr::decls_iterator I = Old->decls_begin(),
          E = Old->decls_end(); I != E; ++I) {
     NamedDecl *InstD = static_cast<NamedDecl*>(getDerived().TransformDecl(*I));
-    if (!InstD)
-      return SemaRef.ExprError();
+    if (!InstD) {
+      // Silently ignore these if a UsingShadowDecl instantiated to nothing.
+      // This can happen because of dependent hiding.
+      if (isa<UsingShadowDecl>(*I))
+        continue;
+      else
+        return SemaRef.ExprError();
+    }
 
     // Expand using declarations.
     if (isa<UsingDecl>(InstD)) {
@@ -4580,8 +4616,7 @@ TreeTransform<Derived>::TransformUnresolvedLookupExpr(
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformUnaryTypeTraitExpr(UnaryTypeTraitExpr *E,
-                                                    bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformUnaryTypeTraitExpr(UnaryTypeTraitExpr *E) {
   TemporaryBase Rebase(*this, /*FIXME*/E->getLocStart(), DeclarationName());
 
   QualType T = getDerived().TransformType(E->getQueriedType());
@@ -4606,8 +4641,7 @@ TreeTransform<Derived>::TransformUnaryTypeTraitExpr(UnaryTypeTraitExpr *E,
 template<typename Derived>
 Sema::OwningExprResult
 TreeTransform<Derived>::TransformDependentScopeDeclRefExpr(
-                                                  DependentScopeDeclRefExpr *E,
-                                                     bool isAddressOfOperand) {
+                                                  DependentScopeDeclRefExpr *E) {
   NestedNameSpecifier *NNS
     = getDerived().TransformNestedNameSpecifier(E->getQualifier(),
                                                 E->getQualifierRange());
@@ -4647,8 +4681,7 @@ TreeTransform<Derived>::TransformDependentScopeDeclRefExpr(
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXConstructExpr(CXXConstructExpr *E,
-                                                  bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCXXConstructExpr(CXXConstructExpr *E) {
   TemporaryBase Rebase(*this, /*FIXME*/E->getLocStart(), DeclarationName());
 
   QualType T = getDerived().TransformType(E->getType());
@@ -4666,6 +4699,11 @@ TreeTransform<Derived>::TransformCXXConstructExpr(CXXConstructExpr *E,
   for (CXXConstructExpr::arg_iterator Arg = E->arg_begin(),
        ArgEnd = E->arg_end();
        Arg != ArgEnd; ++Arg) {
+    if (getDerived().DropCallArgument(*Arg)) {
+      ArgumentChanged = true;
+      break;
+    }
+
     OwningExprResult TransArg = getDerived().TransformExpr(*Arg);
     if (TransArg.isInvalid())
       return SemaRef.ExprError();
@@ -4680,7 +4718,8 @@ TreeTransform<Derived>::TransformCXXConstructExpr(CXXConstructExpr *E,
       !ArgumentChanged)
     return SemaRef.Owned(E->Retain());
 
-  return getDerived().RebuildCXXConstructExpr(T, Constructor, E->isElidable(),
+  return getDerived().RebuildCXXConstructExpr(T, /*FIXME:*/E->getLocStart(),
+                                              Constructor, E->isElidable(),
                                               move_arg(Args));
 }
 
@@ -4692,8 +4731,7 @@ TreeTransform<Derived>::TransformCXXConstructExpr(CXXConstructExpr *E,
 /// must be unique.
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformCXXBindTemporaryExpr(CXXBindTemporaryExpr *E,
-                                                      bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
   OwningExprResult SubExpr = getDerived().TransformExpr(E->getSubExpr());
   if (SubExpr.isInvalid())
     return SemaRef.ExprError();
@@ -4711,8 +4749,7 @@ TreeTransform<Derived>::TransformCXXBindTemporaryExpr(CXXBindTemporaryExpr *E,
 template<typename Derived>
 Sema::OwningExprResult
 TreeTransform<Derived>::TransformCXXExprWithTemporaries(
-                                                      CXXExprWithTemporaries *E,
-                                                      bool isAddressOfOperand) {
+                                                      CXXExprWithTemporaries *E) {
   OwningExprResult SubExpr = getDerived().TransformExpr(E->getSubExpr());
   if (SubExpr.isInvalid())
     return SemaRef.ExprError();
@@ -4725,8 +4762,7 @@ TreeTransform<Derived>::TransformCXXExprWithTemporaries(
 template<typename Derived>
 Sema::OwningExprResult
 TreeTransform<Derived>::TransformCXXTemporaryObjectExpr(
-                                                      CXXTemporaryObjectExpr *E,
-                                                      bool isAddressOfOperand) {
+                                                      CXXTemporaryObjectExpr *E) {
   TemporaryBase Rebase(*this, E->getTypeBeginLoc(), DeclarationName());
   QualType T = getDerived().TransformType(E->getType());
   if (T.isNull())
@@ -4776,8 +4812,7 @@ TreeTransform<Derived>::TransformCXXTemporaryObjectExpr(
 template<typename Derived>
 Sema::OwningExprResult
 TreeTransform<Derived>::TransformCXXUnresolvedConstructExpr(
-                                                  CXXUnresolvedConstructExpr *E,
-                                                  bool isAddressOfOperand) {
+                                                  CXXUnresolvedConstructExpr *E) {
   TemporaryBase Rebase(*this, E->getTypeBeginLoc(), DeclarationName());
   QualType T = getDerived().TransformType(E->getTypeAsWritten());
   if (T.isNull())
@@ -4816,21 +4851,34 @@ TreeTransform<Derived>::TransformCXXUnresolvedConstructExpr(
 template<typename Derived>
 Sema::OwningExprResult
 TreeTransform<Derived>::TransformCXXDependentScopeMemberExpr(
-                                                     CXXDependentScopeMemberExpr *E,
-                                                     bool isAddressOfOperand) {
+                                                     CXXDependentScopeMemberExpr *E) {
   // Transform the base of the expression.
-  OwningExprResult Base = getDerived().TransformExpr(E->getBase());
-  if (Base.isInvalid())
-    return SemaRef.ExprError();
+  OwningExprResult Base(SemaRef, (Expr*) 0);
+  Expr *OldBase;
+  QualType BaseType;
+  QualType ObjectType;
+  if (!E->isImplicitAccess()) {
+    OldBase = E->getBase();
+    Base = getDerived().TransformExpr(OldBase);
+    if (Base.isInvalid())
+      return SemaRef.ExprError();
 
-  // Start the member reference and compute the object's type.
-  Sema::TypeTy *ObjectType = 0;
-  Base = SemaRef.ActOnStartCXXMemberReference(0, move(Base),
-                                              E->getOperatorLoc(),
+    // Start the member reference and compute the object's type.
+    Sema::TypeTy *ObjectTy = 0;
+    Base = SemaRef.ActOnStartCXXMemberReference(0, move(Base),
+                                                E->getOperatorLoc(),
                                       E->isArrow()? tok::arrow : tok::period,
-                                              ObjectType);
-  if (Base.isInvalid())
-    return SemaRef.ExprError();
+                                                ObjectTy);
+    if (Base.isInvalid())
+      return SemaRef.ExprError();
+
+    ObjectType = QualType::getFromOpaquePtr(ObjectTy);
+    BaseType = ((Expr*) Base.get())->getType();
+  } else {
+    OldBase = 0;
+    BaseType = getDerived().TransformType(E->getBaseType());
+    ObjectType = BaseType->getAs<PointerType>()->getPointeeType();
+  }
 
   // Transform the first part of the nested-name-specifier that qualifies
   // the member name.
@@ -4843,29 +4891,31 @@ TreeTransform<Derived>::TransformCXXDependentScopeMemberExpr(
   if (E->getQualifier()) {
     Qualifier = getDerived().TransformNestedNameSpecifier(E->getQualifier(),
                                                       E->getQualifierRange(),
-                                      QualType::getFromOpaquePtr(ObjectType),
-                                                        FirstQualifierInScope);
+                                                      ObjectType,
+                                                      FirstQualifierInScope);
     if (!Qualifier)
       return SemaRef.ExprError();
   }
 
   DeclarationName Name
     = getDerived().TransformDeclarationName(E->getMember(), E->getMemberLoc(),
-                                       QualType::getFromOpaquePtr(ObjectType));
+                                            ObjectType);
   if (!Name)
     return SemaRef.ExprError();
 
-  if (!E->hasExplicitTemplateArgumentList()) {
+  if (!E->hasExplicitTemplateArgs()) {
     // This is a reference to a member without an explicitly-specified
     // template argument list. Optimize for this common case.
     if (!getDerived().AlwaysRebuild() &&
-        Base.get() == E->getBase() &&
+        Base.get() == OldBase &&
+        BaseType == E->getBaseType() &&
         Qualifier == E->getQualifier() &&
         Name == E->getMember() &&
         FirstQualifierInScope == E->getFirstQualifierFoundInScope())
       return SemaRef.Owned(E->Retain());
 
     return getDerived().RebuildCXXDependentScopeMemberExpr(move(Base),
+                                                       BaseType,
                                                        E->isArrow(),
                                                        E->getOperatorLoc(),
                                                        Qualifier,
@@ -4885,6 +4935,7 @@ TreeTransform<Derived>::TransformCXXDependentScopeMemberExpr(
   }
 
   return getDerived().RebuildCXXDependentScopeMemberExpr(move(Base),
+                                                     BaseType,
                                                      E->isArrow(),
                                                      E->getOperatorLoc(),
                                                      Qualifier,
@@ -4897,12 +4948,18 @@ TreeTransform<Derived>::TransformCXXDependentScopeMemberExpr(
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformUnresolvedMemberExpr(UnresolvedMemberExpr *Old,
-                                                      bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformUnresolvedMemberExpr(UnresolvedMemberExpr *Old) {
   // Transform the base of the expression.
-  OwningExprResult Base = getDerived().TransformExpr(Old->getBase());
-  if (Base.isInvalid())
-    return SemaRef.ExprError();
+  OwningExprResult Base(SemaRef, (Expr*) 0);
+  QualType BaseType;
+  if (!Old->isImplicitAccess()) {
+    Base = getDerived().TransformExpr(Old->getBase());
+    if (Base.isInvalid())
+      return SemaRef.ExprError();
+    BaseType = ((Expr*) Base.get())->getType();
+  } else {
+    BaseType = getDerived().TransformType(Old->getBaseType());
+  }
 
   NestedNameSpecifier *Qualifier = 0;
   if (Old->getQualifier()) {
@@ -4920,8 +4977,14 @@ TreeTransform<Derived>::TransformUnresolvedMemberExpr(UnresolvedMemberExpr *Old,
   for (UnresolvedMemberExpr::decls_iterator I = Old->decls_begin(),
          E = Old->decls_end(); I != E; ++I) {
     NamedDecl *InstD = static_cast<NamedDecl*>(getDerived().TransformDecl(*I));
-    if (!InstD)
-      return SemaRef.ExprError();
+    if (!InstD) {
+      // Silently ignore these if a UsingShadowDecl instantiated to nothing.
+      // This can happen because of dependent hiding.
+      if (isa<UsingShadowDecl>(*I))
+        continue;
+      else
+        return SemaRef.ExprError();
+    }
 
     // Expand using declarations.
     if (isa<UsingDecl>(InstD)) {
@@ -4951,6 +5014,7 @@ TreeTransform<Derived>::TransformUnresolvedMemberExpr(UnresolvedMemberExpr *Old,
   }
   
   return getDerived().RebuildUnresolvedMemberExpr(move(Base),
+                                                  BaseType,
                                                   Old->getOperatorLoc(),
                                                   Old->isArrow(),
                                                   Qualifier,
@@ -4962,15 +5026,13 @@ TreeTransform<Derived>::TransformUnresolvedMemberExpr(UnresolvedMemberExpr *Old,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformObjCStringLiteral(ObjCStringLiteral *E,
-                                                   bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformObjCStringLiteral(ObjCStringLiteral *E) {
   return SemaRef.Owned(E->Retain());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformObjCEncodeExpr(ObjCEncodeExpr *E,
-                                                bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformObjCEncodeExpr(ObjCEncodeExpr *E) {
   // FIXME: poor source location
   TemporaryBase Rebase(*this, E->getAtLoc(), DeclarationName());
   QualType EncodedType = getDerived().TransformType(E->getEncodedType());
@@ -4988,8 +5050,7 @@ TreeTransform<Derived>::TransformObjCEncodeExpr(ObjCEncodeExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformObjCMessageExpr(ObjCMessageExpr *E,
-                                                 bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformObjCMessageExpr(ObjCMessageExpr *E) {
   // FIXME: Implement this!
   assert(false && "Cannot transform Objective-C expressions yet");
   return SemaRef.Owned(E->Retain());
@@ -4997,15 +5058,13 @@ TreeTransform<Derived>::TransformObjCMessageExpr(ObjCMessageExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformObjCSelectorExpr(ObjCSelectorExpr *E,
-                                                  bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformObjCSelectorExpr(ObjCSelectorExpr *E) {
   return SemaRef.Owned(E->Retain());
 }
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformObjCProtocolExpr(ObjCProtocolExpr *E,
-                                                  bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformObjCProtocolExpr(ObjCProtocolExpr *E) {
   ObjCProtocolDecl *Protocol
     = cast_or_null<ObjCProtocolDecl>(
                                 getDerived().TransformDecl(E->getProtocol()));
@@ -5026,8 +5085,7 @@ TreeTransform<Derived>::TransformObjCProtocolExpr(ObjCProtocolExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformObjCIvarRefExpr(ObjCIvarRefExpr *E,
-                                                 bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformObjCIvarRefExpr(ObjCIvarRefExpr *E) {
   // FIXME: Implement this!
   assert(false && "Cannot transform Objective-C expressions yet");
   return SemaRef.Owned(E->Retain());
@@ -5035,8 +5093,7 @@ TreeTransform<Derived>::TransformObjCIvarRefExpr(ObjCIvarRefExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformObjCPropertyRefExpr(ObjCPropertyRefExpr *E,
-                                                     bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformObjCPropertyRefExpr(ObjCPropertyRefExpr *E) {
   // FIXME: Implement this!
   assert(false && "Cannot transform Objective-C expressions yet");
   return SemaRef.Owned(E->Retain());
@@ -5045,8 +5102,7 @@ TreeTransform<Derived>::TransformObjCPropertyRefExpr(ObjCPropertyRefExpr *E,
 template<typename Derived>
 Sema::OwningExprResult
 TreeTransform<Derived>::TransformObjCImplicitSetterGetterRefExpr(
-                                          ObjCImplicitSetterGetterRefExpr *E,
-                                                     bool isAddressOfOperand) {
+                                          ObjCImplicitSetterGetterRefExpr *E) {
   // FIXME: Implement this!
   assert(false && "Cannot transform Objective-C expressions yet");
   return SemaRef.Owned(E->Retain());
@@ -5054,8 +5110,7 @@ TreeTransform<Derived>::TransformObjCImplicitSetterGetterRefExpr(
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformObjCSuperExpr(ObjCSuperExpr *E,
-                                               bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformObjCSuperExpr(ObjCSuperExpr *E) {
   // FIXME: Implement this!
   assert(false && "Cannot transform Objective-C expressions yet");
   return SemaRef.Owned(E->Retain());
@@ -5063,8 +5118,7 @@ TreeTransform<Derived>::TransformObjCSuperExpr(ObjCSuperExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformObjCIsaExpr(ObjCIsaExpr *E,
-                                             bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformObjCIsaExpr(ObjCIsaExpr *E) {
   // FIXME: Implement this!
   assert(false && "Cannot transform Objective-C expressions yet");
   return SemaRef.Owned(E->Retain());
@@ -5072,8 +5126,7 @@ TreeTransform<Derived>::TransformObjCIsaExpr(ObjCIsaExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformShuffleVectorExpr(ShuffleVectorExpr *E,
-                                                   bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformShuffleVectorExpr(ShuffleVectorExpr *E) {
   bool ArgumentChanged = false;
   ASTOwningVector<&ActionBase::DeleteExpr> SubExprs(SemaRef);
   for (unsigned I = 0, N = E->getNumSubExprs(); I != N; ++I) {
@@ -5096,8 +5149,7 @@ TreeTransform<Derived>::TransformShuffleVectorExpr(ShuffleVectorExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformBlockExpr(BlockExpr *E,
-                                           bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformBlockExpr(BlockExpr *E) {
   // FIXME: Implement this!
   assert(false && "Cannot transform block expressions yet");
   return SemaRef.Owned(E->Retain());
@@ -5105,8 +5157,7 @@ TreeTransform<Derived>::TransformBlockExpr(BlockExpr *E,
 
 template<typename Derived>
 Sema::OwningExprResult
-TreeTransform<Derived>::TransformBlockDeclRefExpr(BlockDeclRefExpr *E,
-                                                  bool isAddressOfOperand) {
+TreeTransform<Derived>::TransformBlockDeclRefExpr(BlockDeclRefExpr *E) {
   // FIXME: Implement this!
   assert(false && "Cannot transform block-related expressions yet");
   return SemaRef.Owned(E->Retain());
@@ -5282,6 +5333,30 @@ QualType TreeTransform<Derived>::RebuildFunctionNoProtoType(QualType T) {
 }
 
 template<typename Derived>
+QualType TreeTransform<Derived>::RebuildUnresolvedUsingType(Decl *D) {
+  assert(D && "no decl found");
+  if (D->isInvalidDecl()) return QualType();
+
+  TypeDecl *Ty;
+  if (isa<UsingDecl>(D)) {
+    UsingDecl *Using = cast<UsingDecl>(D);
+    assert(Using->isTypeName() &&
+           "UnresolvedUsingTypenameDecl transformed to non-typename using");
+
+    // A valid resolved using typename decl points to exactly one type decl.
+    assert(++Using->shadow_begin() == Using->shadow_end());
+    Ty = cast<TypeDecl>((*Using->shadow_begin())->getTargetDecl());
+    
+  } else {
+    assert(isa<UnresolvedUsingTypenameDecl>(D) &&
+           "UnresolvedUsingTypenameDecl transformed to non-using decl");
+    Ty = cast<UnresolvedUsingTypenameDecl>(D);
+  }
+
+  return SemaRef.Context.getTypeDeclType(Ty);
+}
+
+template<typename Derived>
 QualType TreeTransform<Derived>::RebuildTypeOfExprType(ExprArg E) {
   return SemaRef.BuildTypeofExprType(E.takeAs<Expr>());
 }
@@ -5320,7 +5395,7 @@ TreeTransform<Derived>::RebuildNestedNameSpecifier(NestedNameSpecifier *Prefix,
                                                         Range.getEnd(), II,
                                                         ObjectType,
                                                         FirstQualifierInScope,
-                                                        false));
+                                                        false, false));
 }
 
 template<typename Derived>