diff --git a/include/clang/Sema/CodeCompleteConsumer.h b/include/clang/Sema/CodeCompleteConsumer.h
index a1ddec7..b152cca 100644
--- a/include/clang/Sema/CodeCompleteConsumer.h
+++ b/include/clang/Sema/CodeCompleteConsumer.h
@@ -271,22 +271,17 @@
   QualType BaseType;
 
   /// \brief The identifiers for Objective-C selector parts.
-  IdentifierInfo **SelIdents;
-
-  /// \brief The number of Objective-C selector parts.
-  unsigned NumSelIdents;
+  ArrayRef<IdentifierInfo *> SelIdents;
 
 public:
   /// \brief Construct a new code-completion context of the given kind.
-  CodeCompletionContext(enum Kind Kind) : Kind(Kind), SelIdents(NULL),
-                                          NumSelIdents(0) { }
+  CodeCompletionContext(enum Kind Kind) : Kind(Kind), SelIdents(None) { }
 
   /// \brief Construct a new code-completion context of the given kind.
   CodeCompletionContext(enum Kind Kind, QualType T,
-                        IdentifierInfo **SelIdents = NULL,
-                        unsigned NumSelIdents = 0) : Kind(Kind),
-                                                     SelIdents(SelIdents),
-                                                    NumSelIdents(NumSelIdents) {
+                        ArrayRef<IdentifierInfo *> SelIdents = None)
+                        : Kind(Kind),
+                          SelIdents(SelIdents) {
     if (Kind == CCC_DotMemberAccess || Kind == CCC_ArrowMemberAccess ||
         Kind == CCC_ObjCPropertyAccess || Kind == CCC_ObjCClassMessage ||
         Kind == CCC_ObjCInstanceMessage)
@@ -308,10 +303,10 @@
   QualType getBaseType() const { return BaseType; }
 
   /// \brief Retrieve the Objective-C selector identifiers.
-  IdentifierInfo **getSelIdents() const { return SelIdents; }
+  IdentifierInfo * const *getSelIdents() const { return SelIdents.data(); }
 
   /// \brief Retrieve the number of Objective-C selector identifiers.
-  unsigned getNumSelIdents() const { return NumSelIdents; }
+  unsigned getNumSelIdents() const { return SelIdents.size(); }
 
   /// \brief Determines whether we want C++ constructors as results within this
   /// context.
diff --git a/include/clang/Sema/Sema.h b/include/clang/Sema/Sema.h
index 0cd639d..03952fe 100644
--- a/include/clang/Sema/Sema.h
+++ b/include/clang/Sema/Sema.h
@@ -7372,24 +7372,20 @@
                                    bool IsParameter);
   void CodeCompleteObjCMessageReceiver(Scope *S);
   void CodeCompleteObjCSuperMessage(Scope *S, SourceLocation SuperLoc,
-                                    IdentifierInfo **SelIdents,
-                                    unsigned NumSelIdents,
+                                    ArrayRef<IdentifierInfo *> SelIdents,
                                     bool AtArgumentExpression);
   void CodeCompleteObjCClassMessage(Scope *S, ParsedType Receiver,
-                                    IdentifierInfo **SelIdents,
-                                    unsigned NumSelIdents,
+                                    ArrayRef<IdentifierInfo *> SelIdents,
                                     bool AtArgumentExpression,
                                     bool IsSuper = false);
   void CodeCompleteObjCInstanceMessage(Scope *S, Expr *Receiver,
-                                       IdentifierInfo **SelIdents,
-                                       unsigned NumSelIdents,
+                                       ArrayRef<IdentifierInfo *> SelIdents,
                                        bool AtArgumentExpression,
                                        ObjCInterfaceDecl *Super = 0);
   void CodeCompleteObjCForCollection(Scope *S,
                                      DeclGroupPtrTy IterationVar);
   void CodeCompleteObjCSelector(Scope *S,
-                                IdentifierInfo **SelIdents,
-                                unsigned NumSelIdents);
+                                ArrayRef<IdentifierInfo *> SelIdents);
   void CodeCompleteObjCProtocolReferences(IdentifierLocPair *Protocols,
                                           unsigned NumProtocols);
   void CodeCompleteObjCProtocolDecl(Scope *S);
@@ -7414,8 +7410,7 @@
                                           bool IsInstanceMethod,
                                           bool AtParameterName,
                                           ParsedType ReturnType,
-                                          IdentifierInfo **SelIdents,
-                                          unsigned NumSelIdents);
+                                          ArrayRef<IdentifierInfo *> SelIdents);
   void CodeCompletePreprocessorDirective(bool InConditional);
   void CodeCompleteInPreprocessorConditionalExclusion(Scope *S);
   void CodeCompletePreprocessorMacroName(bool IsDefinition);
diff --git a/lib/Parse/ParseObjc.cpp b/lib/Parse/ParseObjc.cpp
index 1e10a82..e4793db 100644
--- a/lib/Parse/ParseObjc.cpp
+++ b/lib/Parse/ParseObjc.cpp
@@ -1080,9 +1080,7 @@
       Actions.CodeCompleteObjCMethodDeclSelector(getCurScope(), 
                                                  mType == tok::minus,
                                                  /*AtParameterName=*/true,
-                                                 ReturnType,
-                                                 KeyIdents.data(), 
-                                                 KeyIdents.size());
+                                                 ReturnType, KeyIdents);
       cutOffParsing();
       return 0;
     }
@@ -1108,9 +1106,7 @@
       Actions.CodeCompleteObjCMethodDeclSelector(getCurScope(), 
                                                  mType == tok::minus,
                                                  /*AtParameterName=*/false,
-                                                 ReturnType,
-                                                 KeyIdents.data(), 
-                                                 KeyIdents.size());
+                                                 ReturnType, KeyIdents);
       cutOffParsing();
       return 0;
     }
@@ -2456,14 +2452,14 @@
 
   if (Tok.is(tok::code_completion)) {
     if (SuperLoc.isValid())
-      Actions.CodeCompleteObjCSuperMessage(getCurScope(), SuperLoc, 0, 0,
+      Actions.CodeCompleteObjCSuperMessage(getCurScope(), SuperLoc, None,
                                            false);
     else if (ReceiverType)
-      Actions.CodeCompleteObjCClassMessage(getCurScope(), ReceiverType, 0, 0,
+      Actions.CodeCompleteObjCClassMessage(getCurScope(), ReceiverType, None,
                                            false);
     else
       Actions.CodeCompleteObjCInstanceMessage(getCurScope(), ReceiverExpr,
-                                              0, 0, false);
+                                              None, false);
     cutOffParsing();
     return ExprError();
   }
@@ -2497,18 +2493,15 @@
       if (Tok.is(tok::code_completion)) {
         if (SuperLoc.isValid())
           Actions.CodeCompleteObjCSuperMessage(getCurScope(), SuperLoc, 
-                                               KeyIdents.data(), 
-                                               KeyIdents.size(),
+                                               KeyIdents,
                                                /*AtArgumentEpression=*/true);
         else if (ReceiverType)
           Actions.CodeCompleteObjCClassMessage(getCurScope(), ReceiverType,
-                                               KeyIdents.data(), 
-                                               KeyIdents.size(),
+                                               KeyIdents,
                                                /*AtArgumentEpression=*/true);
         else
           Actions.CodeCompleteObjCInstanceMessage(getCurScope(), ReceiverExpr,
-                                                  KeyIdents.data(), 
-                                                  KeyIdents.size(),
+                                                  KeyIdents,
                                                   /*AtArgumentEpression=*/true);
 
         cutOffParsing();
@@ -2538,18 +2531,15 @@
       if (Tok.is(tok::code_completion)) {
         if (SuperLoc.isValid())
           Actions.CodeCompleteObjCSuperMessage(getCurScope(), SuperLoc, 
-                                               KeyIdents.data(), 
-                                               KeyIdents.size(),
+                                               KeyIdents,
                                                /*AtArgumentEpression=*/false);
         else if (ReceiverType)
           Actions.CodeCompleteObjCClassMessage(getCurScope(), ReceiverType,
-                                               KeyIdents.data(), 
-                                               KeyIdents.size(),
+                                               KeyIdents,
                                                /*AtArgumentEpression=*/false);
         else
           Actions.CodeCompleteObjCInstanceMessage(getCurScope(), ReceiverExpr,
-                                                  KeyIdents.data(), 
-                                                  KeyIdents.size(),
+                                                  KeyIdents,
                                                 /*AtArgumentEpression=*/false);
         cutOffParsing();
         return ExprError();
@@ -2871,8 +2861,7 @@
   T.consumeOpen();
 
   if (Tok.is(tok::code_completion)) {
-    Actions.CodeCompleteObjCSelector(getCurScope(), KeyIdents.data(),
-                                     KeyIdents.size());
+    Actions.CodeCompleteObjCSelector(getCurScope(), KeyIdents);
     cutOffParsing();
     return ExprError();
   }
@@ -2898,8 +2887,7 @@
         break;
       
       if (Tok.is(tok::code_completion)) {
-        Actions.CodeCompleteObjCSelector(getCurScope(), KeyIdents.data(),
-                                         KeyIdents.size());
+        Actions.CodeCompleteObjCSelector(getCurScope(), KeyIdents);
         cutOffParsing();
         return ExprError();
       }
diff --git a/lib/Sema/SemaCodeComplete.cpp b/lib/Sema/SemaCodeComplete.cpp
index b488364..6bda0b4 100644
--- a/lib/Sema/SemaCodeComplete.cpp
+++ b/lib/Sema/SemaCodeComplete.cpp
@@ -3303,8 +3303,7 @@
 
 static void AddClassMessageCompletions(Sema &SemaRef, Scope *S, 
                                        ParsedType Receiver,
-                                       IdentifierInfo **SelIdents,
-                                       unsigned NumSelIdents,
+                                       ArrayRef<IdentifierInfo *> SelIdents,
                                        bool AtArgumentExpression,
                                        bool IsSuper,
                                        ResultBuilder &Results);
@@ -3360,7 +3359,7 @@
                         Scope::AtCatchScope)) == 0) {
     ParsedType T = DS.getRepAsType();
     if (!T.get().isNull() && T.get()->isObjCObjectOrInterfaceType())
-      AddClassMessageCompletions(*this, S, T, 0, 0, false, false, Results); 
+      AddClassMessageCompletions(*this, S, T, None, false, false, Results);
   }
 
   // Note that we intentionally suppress macro results here, since we do not
@@ -3436,7 +3435,7 @@
   if (E.isInvalid())
     CodeCompleteOrdinaryName(S, PCC_RecoveryInFunction);
   else if (getLangOpts().ObjC1)
-    CodeCompleteObjCInstanceMessage(S, E.take(), 0, 0, false);
+    CodeCompleteObjCInstanceMessage(S, E.take(), None, false);
 }
 
 /// \brief The set of properties that have already been added, referenced by
@@ -4786,9 +4785,9 @@
 
 static bool isAcceptableObjCSelector(Selector Sel,
                                      ObjCMethodKind WantKind,
-                                     IdentifierInfo **SelIdents,
-                                     unsigned NumSelIdents,
+                                     ArrayRef<IdentifierInfo *> SelIdents,
                                      bool AllowSameLength = true) {
+  unsigned NumSelIdents = SelIdents.size();
   if (NumSelIdents > Sel.getNumArgs())
     return false;
   
@@ -4810,11 +4809,10 @@
 
 static bool isAcceptableObjCMethod(ObjCMethodDecl *Method,
                                    ObjCMethodKind WantKind,
-                                   IdentifierInfo **SelIdents,
-                                   unsigned NumSelIdents,
+                                   ArrayRef<IdentifierInfo *> SelIdents,
                                    bool AllowSameLength = true) {
   return isAcceptableObjCSelector(Method->getSelector(), WantKind, SelIdents,
-                                  NumSelIdents, AllowSameLength);
+                                  AllowSameLength);
 }
 
 namespace {
@@ -4846,8 +4844,7 @@
 static void AddObjCMethods(ObjCContainerDecl *Container, 
                            bool WantInstanceMethods,
                            ObjCMethodKind WantKind,
-                           IdentifierInfo **SelIdents,
-                           unsigned NumSelIdents,
+                           ArrayRef<IdentifierInfo *> SelIdents,
                            DeclContext *CurContext,
                            VisitedSelectorSet &Selectors,
                            bool AllowSameLength,
@@ -4866,15 +4863,14 @@
         (isRootClass && !WantInstanceMethods)) {
       // Check whether the selector identifiers we've been given are a 
       // subset of the identifiers for this particular method.
-      if (!isAcceptableObjCMethod(*M, WantKind, SelIdents, NumSelIdents,
-                                  AllowSameLength))
+      if (!isAcceptableObjCMethod(*M, WantKind, SelIdents, AllowSameLength))
         continue;
 
       if (!Selectors.insert(M->getSelector()))
         continue;
       
       Result R = Result(*M, Results.getBasePriority(*M), 0);
-      R.StartParameter = NumSelIdents;
+      R.StartParameter = SelIdents.size();
       R.AllParametersAreInformative = (WantKind != MK_Any);
       if (!InOriginalClass)
         R.Priority += CCD_InBaseClass;
@@ -4891,8 +4887,7 @@
                                                 E = Protocols.end(); 
            I != E; ++I)
         AddObjCMethods(*I, WantInstanceMethods, WantKind, SelIdents, 
-                       NumSelIdents, CurContext, Selectors, AllowSameLength, 
-                       Results, false);
+                       CurContext, Selectors, AllowSameLength, Results, false);
     }
   }
   
@@ -4903,7 +4898,7 @@
   for (ObjCInterfaceDecl::protocol_iterator I = IFace->protocol_begin(),
                                             E = IFace->protocol_end();
        I != E; ++I)
-    AddObjCMethods(*I, WantInstanceMethods, WantKind, SelIdents, NumSelIdents, 
+    AddObjCMethods(*I, WantInstanceMethods, WantKind, SelIdents,
                    CurContext, Selectors, AllowSameLength, Results, false);
   
   // Add methods in categories.
@@ -4914,7 +4909,7 @@
     ObjCCategoryDecl *CatDecl = *Cat;
     
     AddObjCMethods(CatDecl, WantInstanceMethods, WantKind, SelIdents,
-                   NumSelIdents, CurContext, Selectors, AllowSameLength, 
+                   CurContext, Selectors, AllowSameLength,
                    Results, InOriginalClass);
     
     // Add a categories protocol methods.
@@ -4924,26 +4919,26 @@
                                               E = Protocols.end();
          I != E; ++I)
       AddObjCMethods(*I, WantInstanceMethods, WantKind, SelIdents, 
-                     NumSelIdents, CurContext, Selectors, AllowSameLength, 
+                     CurContext, Selectors, AllowSameLength,
                      Results, false);
     
     // Add methods in category implementations.
     if (ObjCCategoryImplDecl *Impl = CatDecl->getImplementation())
       AddObjCMethods(Impl, WantInstanceMethods, WantKind, SelIdents, 
-                     NumSelIdents, CurContext, Selectors, AllowSameLength, 
+                     CurContext, Selectors, AllowSameLength,
                      Results, InOriginalClass);
   }
   
   // Add methods in superclass.
   if (IFace->getSuperClass())
     AddObjCMethods(IFace->getSuperClass(), WantInstanceMethods, WantKind, 
-                   SelIdents, NumSelIdents, CurContext, Selectors, 
+                   SelIdents, CurContext, Selectors,
                    AllowSameLength, Results, false);
 
   // Add methods in our implementation, if any.
   if (ObjCImplementationDecl *Impl = IFace->getImplementation())
     AddObjCMethods(Impl, WantInstanceMethods, WantKind, SelIdents,
-                   NumSelIdents, CurContext, Selectors, AllowSameLength, 
+                   CurContext, Selectors, AllowSameLength,
                    Results, InOriginalClass);
 }
 
@@ -4967,7 +4962,7 @@
   Results.EnterNewScope();
 
   VisitedSelectorSet Selectors;
-  AddObjCMethods(Class, true, MK_ZeroArgSelector, 0, 0, CurContext, Selectors,
+  AddObjCMethods(Class, true, MK_ZeroArgSelector, None, CurContext, Selectors,
                  /*AllowSameLength=*/true, Results);
   Results.ExitScope();
   HandleCodeCompleteResults(this, CodeCompleter,
@@ -4995,7 +4990,7 @@
   Results.EnterNewScope();
 
   VisitedSelectorSet Selectors;
-  AddObjCMethods(Class, true, MK_OneArgSelector, 0, 0, CurContext, 
+  AddObjCMethods(Class, true, MK_OneArgSelector, None, CurContext,
                  Selectors, /*AllowSameLength=*/true, Results);
 
   Results.ExitScope();
@@ -5159,16 +5154,14 @@
 /// \param SelIdents The identifiers in the selector that have already been
 /// provided as arguments for a send to "super".
 ///
-/// \param NumSelIdents The number of identifiers in \p SelIdents.
-///
 /// \param Results The set of results to augment.
 ///
 /// \returns the Objective-C method declaration that would be invoked by 
 /// this "super" completion. If NULL, no completion was added.
-static ObjCMethodDecl *AddSuperSendCompletion(Sema &S, bool NeedSuperKeyword,
-                                              IdentifierInfo **SelIdents,
-                                              unsigned NumSelIdents,
-                                              ResultBuilder &Results) {
+static ObjCMethodDecl *AddSuperSendCompletion(
+                                          Sema &S, bool NeedSuperKeyword,
+                                          ArrayRef<IdentifierInfo *> SelIdents,
+                                          ResultBuilder &Results) {
   ObjCMethodDecl *CurMethod = S.getCurMethodDecl();
   if (!CurMethod)
     return 0;
@@ -5244,14 +5237,14 @@
   } else {
     ObjCMethodDecl::param_iterator CurP = CurMethod->param_begin();
     for (unsigned I = 0, N = Sel.getNumArgs(); I != N; ++I, ++CurP) {
-      if (I > NumSelIdents)
+      if (I > SelIdents.size())
         Builder.AddChunk(CodeCompletionString::CK_HorizontalSpace);
       
-      if (I < NumSelIdents)
+      if (I < SelIdents.size())
         Builder.AddInformativeChunk(
                    Builder.getAllocator().CopyString(
                                                  Sel.getNameForSlot(I) + ":"));
-      else if (NeedSuperKeyword || I > NumSelIdents) {
+      else if (NeedSuperKeyword || I > SelIdents.size()) {
         Builder.AddTextChunk(
                  Builder.getAllocator().CopyString(
                                                   Sel.getNameForSlot(I) + ":"));
@@ -5293,7 +5286,7 @@
       if (Iface->getSuperClass()) {
         Results.AddResult(Result("super"));
         
-        AddSuperSendCompletion(*this, /*NeedSuperKeyword=*/true, 0, 0, Results);
+        AddSuperSendCompletion(*this, /*NeedSuperKeyword=*/true, None, Results);
       }
   
   if (getLangOpts().CPlusPlus11)
@@ -5309,8 +5302,7 @@
 }
 
 void Sema::CodeCompleteObjCSuperMessage(Scope *S, SourceLocation SuperLoc,
-                                        IdentifierInfo **SelIdents,
-                                        unsigned NumSelIdents,
+                                        ArrayRef<IdentifierInfo *> SelIdents,
                                         bool AtArgumentExpression) {
   ObjCInterfaceDecl *CDecl = 0;
   if (ObjCMethodDecl *CurMethod = getCurMethodDecl()) {
@@ -5328,8 +5320,7 @@
       // We are inside an instance method, which means that the message
       // send [super ...] is actually calling an instance method on the
       // current object.
-      return CodeCompleteObjCInstanceMessage(S, 0,
-                                             SelIdents, NumSelIdents,
+      return CodeCompleteObjCInstanceMessage(S, 0, SelIdents,
                                              AtArgumentExpression,
                                              CDecl);
     }
@@ -5358,7 +5349,7 @@
       ExprResult SuperExpr = ActOnIdExpression(S, SS, TemplateKWLoc, id,
                                                false, false);
       return CodeCompleteObjCInstanceMessage(S, (Expr *)SuperExpr.get(),
-                                             SelIdents, NumSelIdents,
+                                             SelIdents,
                                              AtArgumentExpression);
     }
 
@@ -5369,7 +5360,7 @@
   if (CDecl)
     Receiver = ParsedType::make(Context.getObjCInterfaceType(CDecl));
   return CodeCompleteObjCClassMessage(S, Receiver, SelIdents, 
-                                      NumSelIdents, AtArgumentExpression,
+                                      AtArgumentExpression,
                                       /*IsSuper=*/true);
 }
 
@@ -5409,8 +5400,7 @@
 
 static void AddClassMessageCompletions(Sema &SemaRef, Scope *S, 
                                        ParsedType Receiver,
-                                       IdentifierInfo **SelIdents,
-                                       unsigned NumSelIdents,
+                                       ArrayRef<IdentifierInfo *> SelIdents,
                                        bool AtArgumentExpression,
                                        bool IsSuper,
                                        ResultBuilder &Results) {
@@ -5434,8 +5424,7 @@
   // completion.
   if (IsSuper) {
     if (ObjCMethodDecl *SuperMethod
-        = AddSuperSendCompletion(SemaRef, false, SelIdents, NumSelIdents, 
-                                 Results))
+        = AddSuperSendCompletion(SemaRef, false, SelIdents, Results))
       Results.Ignore(SuperMethod);
   }
   
@@ -5446,7 +5435,7 @@
   
   VisitedSelectorSet Selectors;
   if (CDecl) 
-    AddObjCMethods(CDecl, false, MK_Any, SelIdents, NumSelIdents, 
+    AddObjCMethods(CDecl, false, MK_Any, SelIdents,
                    SemaRef.CurContext, Selectors, AtArgumentExpression,
                    Results);  
   else {
@@ -5472,12 +5461,11 @@
       for (ObjCMethodList *MethList = &M->second.second;
            MethList && MethList->Method; 
            MethList = MethList->getNext()) {
-        if (!isAcceptableObjCMethod(MethList->Method, MK_Any, SelIdents, 
-                                    NumSelIdents))
+        if (!isAcceptableObjCMethod(MethList->Method, MK_Any, SelIdents))
           continue;
         
         Result R(MethList->Method, Results.getBasePriority(MethList->Method),0);
-        R.StartParameter = NumSelIdents;
+        R.StartParameter = SelIdents.size();
         R.AllParametersAreInformative = false;
         Results.MaybeAddResult(R, SemaRef.CurContext);
       }
@@ -5488,8 +5476,7 @@
 }
 
 void Sema::CodeCompleteObjCClassMessage(Scope *S, ParsedType Receiver,
-                                        IdentifierInfo **SelIdents,
-                                        unsigned NumSelIdents,
+                                        ArrayRef<IdentifierInfo *> SelIdents,
                                         bool AtArgumentExpression,
                                         bool IsSuper) {
   
@@ -5498,9 +5485,9 @@
   ResultBuilder Results(*this, CodeCompleter->getAllocator(),
                         CodeCompleter->getCodeCompletionTUInfo(),
               CodeCompletionContext(CodeCompletionContext::CCC_ObjCClassMessage,
-                                    T, SelIdents, NumSelIdents));
+                                    T, SelIdents));
     
-  AddClassMessageCompletions(*this, S, Receiver, SelIdents, NumSelIdents, 
+  AddClassMessageCompletions(*this, S, Receiver, SelIdents,
                              AtArgumentExpression, IsSuper, Results);
   
   // If we're actually at the argument expression (rather than prior to the 
@@ -5510,7 +5497,7 @@
   // our preferred type, improving completion results.
   if (AtArgumentExpression) {
     QualType PreferredType = getPreferredArgumentTypeForMessageSend(Results, 
-                                                                  NumSelIdents);
+                                                              SelIdents.size());
     if (PreferredType.isNull())
       CodeCompleteOrdinaryName(S, PCC_Expression);
     else
@@ -5524,8 +5511,7 @@
 }
 
 void Sema::CodeCompleteObjCInstanceMessage(Scope *S, Expr *Receiver,
-                                           IdentifierInfo **SelIdents,
-                                           unsigned NumSelIdents,
+                                           ArrayRef<IdentifierInfo *> SelIdents,
                                            bool AtArgumentExpression,
                                            ObjCInterfaceDecl *Super) {
   typedef CodeCompletionResult Result;
@@ -5553,7 +5539,7 @@
       if (ReceiverType->isObjCClassType())
         return CodeCompleteObjCClassMessage(S, 
                        ParsedType::make(Context.getObjCInterfaceType(IFace)),
-                                            SelIdents, NumSelIdents,
+                                            SelIdents,
                                             AtArgumentExpression, Super);
 
       ReceiverType = Context.getObjCObjectPointerType(
@@ -5564,7 +5550,7 @@
   ResultBuilder Results(*this, CodeCompleter->getAllocator(),
                         CodeCompleter->getCodeCompletionTUInfo(),
            CodeCompletionContext(CodeCompletionContext::CCC_ObjCInstanceMessage,
-                                 ReceiverType, SelIdents, NumSelIdents));
+                                 ReceiverType, SelIdents));
   
   Results.EnterNewScope();
 
@@ -5572,8 +5558,7 @@
   // completion.
   if (Super) {
     if (ObjCMethodDecl *SuperMethod
-          = AddSuperSendCompletion(*this, false, SelIdents, NumSelIdents, 
-                                   Results))
+          = AddSuperSendCompletion(*this, false, SelIdents, Results))
       Results.Ignore(SuperMethod);
   }
   
@@ -5592,7 +5577,7 @@
       ReceiverType->isObjCQualifiedClassType()) {
     if (ObjCMethodDecl *CurMethod = getCurMethodDecl()) {
       if (ObjCInterfaceDecl *ClassDecl = CurMethod->getClassInterface())
-        AddObjCMethods(ClassDecl, false, MK_Any, SelIdents, NumSelIdents, 
+        AddObjCMethods(ClassDecl, false, MK_Any, SelIdents,
                        CurContext, Selectors, AtArgumentExpression, Results);
     }
   } 
@@ -5603,7 +5588,7 @@
     for (ObjCObjectPointerType::qual_iterator I = QualID->qual_begin(),
                                               E = QualID->qual_end(); 
          I != E; ++I)
-      AddObjCMethods(*I, true, MK_Any, SelIdents, NumSelIdents, CurContext, 
+      AddObjCMethods(*I, true, MK_Any, SelIdents, CurContext,
                      Selectors, AtArgumentExpression, Results);
   }
   // Handle messages to a pointer to interface type.
@@ -5611,14 +5596,14 @@
                               = ReceiverType->getAsObjCInterfacePointerType()) {
     // Search the class, its superclasses, etc., for instance methods.
     AddObjCMethods(IFacePtr->getInterfaceDecl(), true, MK_Any, SelIdents,
-                   NumSelIdents, CurContext, Selectors, AtArgumentExpression, 
+                   CurContext, Selectors, AtArgumentExpression,
                    Results);
     
     // Search protocols for instance methods.
     for (ObjCObjectPointerType::qual_iterator I = IFacePtr->qual_begin(),
          E = IFacePtr->qual_end(); 
          I != E; ++I)
-      AddObjCMethods(*I, true, MK_Any, SelIdents, NumSelIdents, CurContext, 
+      AddObjCMethods(*I, true, MK_Any, SelIdents, CurContext,
                      Selectors, AtArgumentExpression, Results);
   }
   // Handle messages to "id".
@@ -5645,15 +5630,14 @@
       for (ObjCMethodList *MethList = &M->second.first;
            MethList && MethList->Method; 
            MethList = MethList->getNext()) {
-        if (!isAcceptableObjCMethod(MethList->Method, MK_Any, SelIdents, 
-                                    NumSelIdents))
+        if (!isAcceptableObjCMethod(MethList->Method, MK_Any, SelIdents))
           continue;
         
         if (!Selectors.insert(MethList->Method->getSelector()))
           continue;
         
         Result R(MethList->Method, Results.getBasePriority(MethList->Method),0);
-        R.StartParameter = NumSelIdents;
+        R.StartParameter = SelIdents.size();
         R.AllParametersAreInformative = false;
         Results.MaybeAddResult(R, CurContext);
       }
@@ -5669,7 +5653,7 @@
   // our preferred type, improving completion results.
   if (AtArgumentExpression) {
     QualType PreferredType = getPreferredArgumentTypeForMessageSend(Results, 
-                                                                  NumSelIdents);
+                                                              SelIdents.size());
     if (PreferredType.isNull())
       CodeCompleteOrdinaryName(S, PCC_Expression);
     else
@@ -5698,8 +5682,8 @@
   CodeCompleteExpression(S, Data);
 }
 
-void Sema::CodeCompleteObjCSelector(Scope *S, IdentifierInfo **SelIdents,
-                                    unsigned NumSelIdents) {
+void Sema::CodeCompleteObjCSelector(Scope *S,
+                                    ArrayRef<IdentifierInfo *> SelIdents) {
   // If we have an external source, load the entire class method
   // pool from the AST file.
   if (ExternalSource) {
@@ -5722,7 +5706,7 @@
        M != MEnd; ++M) {
     
     Selector Sel = M->first;
-    if (!isAcceptableObjCSelector(Sel, MK_Any, SelIdents, NumSelIdents))
+    if (!isAcceptableObjCSelector(Sel, MK_Any, SelIdents))
       continue;
 
     CodeCompletionBuilder Builder(Results.getAllocator(),
@@ -5736,7 +5720,7 @@
     
     std::string Accumulator;
     for (unsigned I = 0, N = Sel.getNumArgs(); I != N; ++I) {
-      if (I == NumSelIdents) {
+      if (I == SelIdents.size()) {
         if (!Accumulator.empty()) {
           Builder.AddInformativeChunk(Builder.getAllocator().CopyString(
                                                  Accumulator));
@@ -7054,8 +7038,7 @@
                                               bool IsInstanceMethod,
                                               bool AtParameterName,
                                               ParsedType ReturnTy,
-                                              IdentifierInfo **SelIdents,
-                                              unsigned NumSelIdents) {
+                                         ArrayRef<IdentifierInfo *> SelIdents) {
   // If we have an external source, load the entire class method
   // pool from the AST file.
   if (ExternalSource) {
@@ -7086,12 +7069,12 @@
                                                        &M->second.second;
          MethList && MethList->Method; 
          MethList = MethList->getNext()) {
-      if (!isAcceptableObjCMethod(MethList->Method, MK_Any, SelIdents, 
-                                  NumSelIdents))
+      if (!isAcceptableObjCMethod(MethList->Method, MK_Any, SelIdents))
         continue;
       
       if (AtParameterName) {
         // Suggest parameter names we've seen before.
+        unsigned NumSelIdents = SelIdents.size();
         if (NumSelIdents && NumSelIdents <= MethList->Method->param_size()) {
           ParmVarDecl *Param = MethList->Method->param_begin()[NumSelIdents-1];
           if (Param->getIdentifier()) {
@@ -7107,7 +7090,7 @@
       }
       
       Result R(MethList->Method, Results.getBasePriority(MethList->Method), 0);
-      R.StartParameter = NumSelIdents;
+      R.StartParameter = SelIdents.size();
       R.AllParametersAreInformative = false;
       R.DeclaringEntity = true;
       Results.MaybeAddResult(R, CurContext);