Index: include/clang/Parse/Parser.h
===================================================================
--- include/clang/Parse/Parser.h
+++ include/clang/Parse/Parser.h
@@ -290,6 +290,8 @@
            "Should consume special tokens with Consume*Token");
     PrevTokLocation = Tok.getLocation();
     PP.Lex(Tok);
+    if (Tok.is(tok::code_completion))
+      Actions.setCodeCompletionFilter(Tok.getIdentifierInfo());
     return PrevTokLocation;
   }
 
Index: include/clang/Sema/CodeCompleteConsumer.h
===================================================================
--- include/clang/Sema/CodeCompleteConsumer.h
+++ include/clang/Sema/CodeCompleteConsumer.h
@@ -912,6 +912,14 @@
   /// \brief Deregisters and destroys this code-completion consumer.
   virtual ~CodeCompleteConsumer();
 
+  /// \name Code-completion filtering
+  //@{
+  /// \brief Check if the result should be filtered out.
+  virtual bool isResultFilteredOut(StringRef Filter,
+                                CodeCompletionResult Results) {
+    return true;
+  }
+
   /// \name Code-completion callbacks
   //@{
   /// \brief Process the finalized code-completion results.
@@ -965,6 +973,8 @@
                                  OverloadCandidate *Candidates,
                                  unsigned NumCandidates) override;
 
+  bool isResultFilteredOut(StringRef Filter, CodeCompletionResult Results) override;
+
   CodeCompletionAllocator &getAllocator() override {
     return CCTUInfo.getAllocator();
   }
Index: include/clang/Sema/Sema.h
===================================================================
--- include/clang/Sema/Sema.h
+++ include/clang/Sema/Sema.h
@@ -305,6 +305,9 @@
   /// \brief Code-completion consumer.
   CodeCompleteConsumer *CodeCompleter;
 
+  /// \brief Code-complete filter.
+  IdentifierInfo *CodeCompleteFilter;
+
   /// CurContext - This is the current declaration context of parsing.
   DeclContext *CurContext;
 
@@ -8962,6 +8965,15 @@
     PCC_LocalDeclarationSpecifiers
   };
 
+  void setCodeCompletionFilter(IdentifierInfo* filterII) {
+    CodeCompleteFilter = filterII;
+  }
+  StringRef getCodeCompletionFilter() {
+    if (CodeCompleteFilter)
+      return CodeCompleteFilter->getName();
+    return StringRef();
+  }
+
   void CodeCompleteModuleImport(SourceLocation ImportLoc, ModuleIdPath Path);
   void CodeCompleteOrdinaryName(Scope *S,
                                 ParserCompletionContext CompletionContext);
Index: lib/Lex/Lexer.cpp
===================================================================
--- lib/Lex/Lexer.cpp
+++ lib/Lex/Lexer.cpp
@@ -1533,7 +1533,15 @@
     // preprocessor, which may macro expand it or something.
     if (II->isHandleIdentifierCase())
       return PP->HandleIdentifier(Result);
-    
+
+    if (II->getTokenID() == tok::identifier && isCodeCompletionPoint(CurPtr)
+        && II->getPPKeywordID() == tok::pp_not_keyword
+        && II->getObjCKeywordID() == tok::objc_not_keyword) {
+      // Return the code-completion token.
+      Result.setKind(tok::code_completion);
+      cutOffLexing();
+      return true;
+    }
     return true;
   }
 
Index: lib/Sema/CodeCompleteConsumer.cpp
===================================================================
--- lib/Sema/CodeCompleteConsumer.cpp
+++ lib/Sema/CodeCompleteConsumer.cpp
@@ -428,6 +428,28 @@
 
 CodeCompleteConsumer::~CodeCompleteConsumer() { }
 
+bool PrintingCodeCompleteConsumer::isResultFilteredOut(StringRef Filter,
+                                                CodeCompletionResult Result) {
+  switch (Result.Kind) {
+  case CodeCompletionResult::RK_Declaration: {
+    return !(Result.Declaration &&
+            (*Result.Declaration).getIdentifier() &&
+            (*Result.Declaration).getIdentifier()->getName().startswith(Filter));
+  }
+  case CodeCompletionResult::RK_Keyword: {
+    return !(Result.Keyword && StringRef(&(*Result.Keyword)).startswith(Filter));
+  }
+  case CodeCompletionResult::RK_Macro: {
+    return !(Result.Macro && Result.Macro->getName().startswith(Filter));
+  }
+  case CodeCompletionResult::RK_Pattern: {
+    return !(Result.Pattern &&
+             StringRef((Result.Pattern->getAsString())).startswith(Filter));
+  }
+  }
+  return false;
+}
+
 void 
 PrintingCodeCompleteConsumer::ProcessCodeCompleteResults(Sema &SemaRef,
                                                  CodeCompletionContext Context,
@@ -435,8 +457,12 @@
                                                          unsigned NumResults) {
   std::stable_sort(Results, Results + NumResults);
   
+  StringRef Filter = SemaRef.getCodeCompletionFilter();
+
   // Print the results.
   for (unsigned I = 0; I != NumResults; ++I) {
+    if(!Filter.empty() && isResultFilteredOut(Filter, Results[I]))
+      continue;
     OS << "COMPLETION: ";
     switch (Results[I].Kind) {
     case CodeCompletionResult::RK_Declaration:
Index: lib/Sema/Sema.cpp
===================================================================
--- lib/Sema/Sema.cpp
+++ lib/Sema/Sema.cpp
@@ -77,7 +77,7 @@
     isMultiplexExternalSource(false), FPFeatures(pp.getLangOpts()),
     LangOpts(pp.getLangOpts()), PP(pp), Context(ctxt), Consumer(consumer),
     Diags(PP.getDiagnostics()), SourceMgr(PP.getSourceManager()),
-    CollectStats(false), CodeCompleter(CodeCompleter),
+    CollectStats(false), CodeCompleter(CodeCompleter), CodeCompleteFilter(0),
     CurContext(nullptr), OriginalLexicalContext(nullptr),
     PackContext(nullptr), MSStructPragmaOn(false),
     MSPointerToMemberRepresentationMethod(
Index: test/CodeCompletion/objc-message.mm
===================================================================
--- test/CodeCompletion/objc-message.mm
+++ test/CodeCompletion/objc-message.mm
@@ -38,9 +38,9 @@
   [ptr instanceMethod1];
 }
 
-// RUN: %clang_cc1 -fsyntax-only -std=c++11 -code-completion-at=%s:33:7 %s -o - | FileCheck -check-prefix=CHECK-CC1 %s
+// RUN: %clang_cc1 -fsyntax-only -std=c++11 -code-completion-at=%s:33:8 %s -o - | FileCheck -check-prefix=CHECK-CC1 %s
 // CHECK-CC1: categoryInstanceMethod : [#id#]categoryInstanceMethod
 // CHECK-CC1: instanceMethod1 : [#id#]instanceMethod1
 // CHECK-CC1: protocolInstanceMethod : [#id#]protocolInstanceMethod
-// RUN: %clang_cc1 -fsyntax-only -std=c++11 -code-completion-at=%s:38:7 %s -o - | FileCheck -check-prefix=CHECK-CC2 %s
+// RUN: %clang_cc1 -fsyntax-only -std=c++11 -code-completion-at=%s:38:8 %s -o - | FileCheck -check-prefix=CHECK-CC2 %s
 // CHECK-CC2: protocolInstanceMethod : [#id#]protocolInstanceMethod
Index: test/Index/complete-method-decls.m
===================================================================
--- test/Index/complete-method-decls.m
+++ test/Index/complete-method-decls.m
@@ -195,7 +195,7 @@
 // CHECK-CCG: NotImplemented:{TypedText void} (50)
 // CHECK-CCG: NotImplemented:{TypedText volatile} (50)
 // RUN: c-index-test -code-completion-at=%s:60:24 %s | FileCheck -check-prefix=CHECK-CCF %s
-// RUN: c-index-test -code-completion-at=%s:60:26 %s | FileCheck -check-prefix=CHECK-CCH %s
+// RUN: c-index-test -code-completion-at=%s:60:27 %s | FileCheck -check-prefix=CHECK-CCH %s
 // CHECK-CCH: ObjCInterfaceDecl:{TypedText A} (50)
 // CHECK-CCH: ObjCInterfaceDecl:{TypedText B} (50)
 // CHECK-CCH: NotImplemented:{TypedText bycopy} (40)
Index: test/Index/complete-objc-message-id.m
===================================================================
--- test/Index/complete-objc-message-id.m
+++ test/Index/complete-objc-message-id.m
@@ -68,7 +68,7 @@
 // CHECK-SELECTOR-PREF: ObjCClassMethodDecl:{ResultType id}{TypedText new} (35)
 // CHECK-SELECTOR-PREF: ObjCClassMethodDecl:{ResultType Class}{TypedText superclass} (35)
 
-// RUN: c-index-test -code-completion-at=%s:46:7 %s | FileCheck -check-prefix=CHECK-INSTANCE-QUAL-ID %s
-// RUN: c-index-test -code-completion-at=%s:47:7 %s | FileCheck -check-prefix=CHECK-INSTANCE-QUAL-ID %s
+// RUN: c-index-test -code-completion-at=%s:46:8 %s | FileCheck -check-prefix=CHECK-INSTANCE-QUAL-ID %s
+// RUN: c-index-test -code-completion-at=%s:47:8 %s | FileCheck -check-prefix=CHECK-INSTANCE-QUAL-ID %s
 // CHECK-INSTANCE-QUAL-ID: ObjCInstanceMethodDecl:{ResultType int}{TypedText P1_method1} (37)
 // CHECK-INSTANCE-QUAL-ID: ObjCInstanceMethodDecl:{ResultType int}{TypedText P2_method1} (35)
Index: test/Index/complete-objc-message.m
===================================================================
--- test/Index/complete-objc-message.m
+++ test/Index/complete-objc-message.m
@@ -218,13 +218,13 @@
 // CHECK-CC2-NEXT: Container Kind: ObjCInterfaceDecl
 // CHECK-CC2-NEXT: Container is complete
 // CHECK-CC2-NEXT: Container USR: c:objc(cs)Foo
-// RUN: c-index-test -code-completion-at=%s:61:16 %s | FileCheck -check-prefix=CHECK-CC3 %s
+// RUN: c-index-test -code-completion-at=%s:61:17 %s | FileCheck -check-prefix=CHECK-CC3 %s
 // CHECK-CC3: ObjCClassMethodDecl:{ResultType int}{TypedText MyClassMethod:}{Placeholder (id)}
 // CHECK-CC3: ObjCClassMethodDecl:{ResultType int}{TypedText MyPrivateMethod}
-// RUN: c-index-test -code-completion-at=%s:65:16 %s | FileCheck -check-prefix=CHECK-CC4 %s
+// RUN: c-index-test -code-completion-at=%s:65:17 %s | FileCheck -check-prefix=CHECK-CC4 %s
 // CHECK-CC4: ObjCInstanceMethodDecl:{ResultType int}{TypedText MyInstMethod:}{Placeholder (id)}{HorizontalSpace  }{TypedText second:}{Placeholder (id)}
 // CHECK-CC4: ObjCInstanceMethodDecl:{ResultType int}{TypedText MyPrivateInstMethod}
-// RUN: c-index-test -code-completion-at=%s:74:9 %s | FileCheck -check-prefix=CHECK-CC5 %s
+// RUN: c-index-test -code-completion-at=%s:74:10 %s | FileCheck -check-prefix=CHECK-CC5 %s
 // CHECK-CC5: ObjCInstanceMethodDecl:{ResultType int}{TypedText MyInstMethod:}{Placeholder (id)}{HorizontalSpace  }{TypedText second:}{Placeholder (id)}
 // CHECK-CC5: ObjCInstanceMethodDecl:{ResultType int}{TypedText MySubInstMethod}
 // RUN: c-index-test -code-completion-at=%s:82:8 %s | FileCheck -check-prefix=CHECK-CC6 %s
@@ -311,7 +311,7 @@
 // CHECK-CCI: ObjCInstanceMethodDecl:{ResultType void}{TypedText method1} (37)
 // CHECK-CCI: ObjCInstanceMethodDecl:{ResultType void}{TypedText method2} (35)
 
-// RUN: c-index-test -code-completion-at=%s:150:5 %s | FileCheck -check-prefix=CHECK-REDUNDANT %s
+// RUN: c-index-test -code-completion-at=%s:150:6 %s | FileCheck -check-prefix=CHECK-REDUNDANT %s
 // CHECK-REDUNDANT: ObjCInstanceMethodDecl:{ResultType void}{TypedText method2} (35)
 // CHECK-REDUNDANT-NOT: ObjCInstanceMethodDecl:{ResultType void}{TypedText method2}
 // CHECK-REDUNDANT: ObjCInstanceMethodDecl:{ResultType void}{TypedText method3} (35)
Index: test/Index/complete-recovery.m
===================================================================
--- test/Index/complete-recovery.m
+++ test/Index/complete-recovery.m
@@ -26,7 +26,7 @@
 // Test case for fix committed in r145441.
 // RUN: env CINDEXTEST_CODE_COMPLETE_PATTERNS=1 c-index-test -code-completion-at=%s:9:20 %s -fms-compatibility | FileCheck -check-prefix=CHECK-CC1 %s
 
-// RUN: env CINDEXTEST_CODE_COMPLETE_PATTERNS=1 c-index-test -code-completion-at=%s:10:24 %s | FileCheck -check-prefix=CHECK-CC2 %s
+// RUN: env CINDEXTEST_CODE_COMPLETE_PATTERNS=1 c-index-test -code-completion-at=%s:10:25 %s | FileCheck -check-prefix=CHECK-CC2 %s
 // CHECK-CC2: NotImplemented:{ResultType char[]}{TypedText @encode}{LeftParen (}{Placeholder type-name}{RightParen )}
 // CHECK-CC2: NotImplemented:{TypedText _Bool}
 // CHECK-CC2: VarDecl:{ResultType A *}{TypedText a}
Index: test/Index/complete-super.m
===================================================================
--- test/Index/complete-super.m
+++ test/Index/complete-super.m
@@ -60,7 +60,7 @@
 // RUN: c-index-test -code-completion-at=%s:20:16 %s | FileCheck -check-prefix=CHECK-ADD-TO %s
 // CHECK-ADD-TO: ObjCInstanceMethodDecl:{ResultType void}{Informative add:}{TypedText to:}{Placeholder b} (20)
 
-// RUN: c-index-test -code-completion-at=%s:24:28 %s | FileCheck -check-prefix=CHECK-SELECTOR-FIRST %s
+// RUN: c-index-test -code-completion-at=%s:24:29 %s | FileCheck -check-prefix=CHECK-SELECTOR-FIRST %s
 // CHECK-SELECTOR-FIRST: ObjCClassMethodDecl:{ResultType void}{Informative select:}{TypedText first:}{Placeholder a}{HorizontalSpace  }{Text second:}{Placeholder b} (20)
 
 // Check "super" completion at the third identifier
@@ -69,7 +69,7 @@
 
 // Check "super" completion with missing '['.
 // RUN: c-index-test -code-completion-at=%s:25:10 %s | FileCheck -check-prefix=CHECK-SELECTOR-SELECTOR %s
-// RUN: c-index-test -code-completion-at=%s:25:28 %s | FileCheck -check-prefix=CHECK-SELECTOR-FIRST %s
+// RUN: c-index-test -code-completion-at=%s:25:29 %s | FileCheck -check-prefix=CHECK-SELECTOR-FIRST %s
 // RUN: c-index-test -code-completion-at=%s:25:37 %s | FileCheck -check-prefix=CHECK-SELECTOR-SECOND %s
 
 // Check "super" completion for a method declared in a category.