diff --git a/clang/lib/Sema/SemaExprCXX.cpp b/clang/lib/Sema/SemaExprCXX.cpp
@@ -845,11 +845,34 @@ QualType Sema::getCurrentThisType() {
       // within a default initializer - so use the enclosing class as 'this'.
       // There is no enclosing member function to retrieve the 'this' pointer
       // from.
+
+      // FIXME: This looks wrong. If we're in a lambda within a lambda within a
+      // default member initializer, we need to recurse up more parents to find
+      // the right context. Looks like we should be walking up to the parent of
+      // the closure type, checking whether that is itself a lambda, and if so,
+      // recursing, until we reach a class or a function that isn't a lambda
+      // call operator. And we should accumulate the constness of *this on the
+      // way.
+
       QualType ClassTy = Context.getTypeDeclType(
           cast<CXXRecordDecl>(CurContext->getParent()->getParent()));
       // There are no cv-qualifiers for 'this' within default initializers, 
       // per [expr.prim.general]p4.
-      return Context.getPointerType(ClassTy);
+      ThisTy = Context.getPointerType(ClassTy);
+    }
+  }
+   // Add const for '* this' capture if not mutable.
+  if (isLambdaCallOperator(CurContext)) {
+    LambdaScopeInfo *LSI = getCurLambda();
+    assert(LSI);
+    if (LSI->isCXXThisCaptured()) {
+      auto C = LSI->getCXXThisCapture();
+      QualType BaseType = ThisTy->getPointeeType();
+      if ((C.isThisCapture() && C.isCopyCapture()) &&
+          LSI->CallOperator->isConst() && !BaseType.isConstQualified()) {
+        BaseType.addConst();
+        ThisTy = Context.getPointerType(BaseType);
+      }
     }
   }
   return ThisTy;
@@ -884,28 +907,70 @@ Sema::CXXThisScopeRAII::~CXXThisScopeRAII() {
   }
 }
 
-static Expr *captureThis(ASTContext &Context, RecordDecl *RD,
-                         QualType ThisTy, SourceLocation Loc) {
+static Expr *captureThis(Sema &S, ASTContext &Context, RecordDecl *RD,
+                         QualType ThisTy, SourceLocation Loc,
+                         const bool ByCopy) {
+  QualType CaptureThisTy = ByCopy ? ThisTy->getPointeeType() : ThisTy;
+
   FieldDecl *Field
-    = FieldDecl::Create(Context, RD, Loc, Loc, nullptr, ThisTy,
-                        Context.getTrivialTypeSourceInfo(ThisTy, Loc),
+       = FieldDecl::Create(Context, RD, Loc, Loc, nullptr, CaptureThisTy,
+                       Context.getTrivialTypeSourceInfo(CaptureThisTy, Loc),
                         nullptr, false, ICIS_NoInit);
   Field->setImplicit(true);
   Field->setAccess(AS_private);
   RD->addDecl(Field);
-  return new (Context) CXXThisExpr(Loc, ThisTy, /*isImplicit*/true);
+  Expr *This = new (Context) CXXThisExpr(Loc, ThisTy, /*isImplicit*/true);
+  if (ByCopy) {
+    Expr *StarThis =  S.CreateBuiltinUnaryOp(Loc,
+                                      UO_Deref,
+                                      This).get();
+    InitializedEntity Entity = InitializedEntity::InitializeLambdaCapture(
+      nullptr, CaptureThisTy, Loc);
+    InitializationKind InitKind = InitializationKind::CreateDirect(Loc, Loc, Loc);
+    InitializationSequence Init(S, Entity, InitKind, StarThis);
+    ExprResult ER = Init.Perform(S, Entity, InitKind, StarThis);
+    if (ER.isInvalid()) return nullptr;
+    return ER.get();
+  }
+  return This;
 }
 
-bool Sema::CheckCXXThisCapture(SourceLocation Loc, bool Explicit, 
-    bool BuildAndDiagnose, const unsigned *const FunctionScopeIndexToStopAt) {
+bool Sema::CheckCXXThisCapture(SourceLocation Loc, const bool Explicit, 
+    bool BuildAndDiagnose, const unsigned *const FunctionScopeIndexToStopAt,
+    const bool ByCopy) {
   // We don't need to capture this in an unevaluated context.
   if (isUnevaluatedContext() && !Explicit)
     return true;
+
+  assert((!ByCopy || Explicit) && "cannot implicitly capture *this by value");
 
   const unsigned MaxFunctionScopesIndex = FunctionScopeIndexToStopAt ?
-    *FunctionScopeIndexToStopAt : FunctionScopes.size() - 1;  
- // Otherwise, check that we can capture 'this'.
-  unsigned NumClosures = 0;
+    *FunctionScopeIndexToStopAt : FunctionScopes.size() - 1;
+
+  // Check that we can capture the *enclosing object* (referred to by '*this')
+  // by the capturing-entity/closure (lambda/block/etc) at 
+  // MaxFunctionScopesIndex-deep on the FunctionScopes stack.  
+
+  // Note: The *enclosing object* can only be captured by-value by a 
+  // closure that is a lambda, using the explicit notation: 
+  //    [*this] { ... }.
+  // Every other capture of the *enclosing object* results in its by-reference
+  // capture.
+
+  // For a closure 'L' (at MaxFunctionScopesIndex in the FunctionScopes
+  // stack), we can capture the *enclosing object* only if:
+  // - 'L' has an explicit byref or byval capture of the *enclosing object*
+  // -  or, 'L' has an implicit capture.
+  // AND 
+  //   -- there is no enclosing closure
+  //   -- or, there is some enclosing closure 'E' that has already captured the 
+  //      *enclosing object*, and every intervening closure (if any) between 'E' 
+  //      and 'L' can implicitly capture the *enclosing object*.
+  //   -- or, every enclosing closure can implicitly capture the 
+  //      *enclosing object*
+
+
+  unsigned NumCapturingClosures = 0;
   for (unsigned idx = MaxFunctionScopesIndex; idx != 0; idx--) {
     if (CapturingScopeInfo *CSI =
             dyn_cast<CapturingScopeInfo>(FunctionScopes[idx])) {
@@ -917,44 +982,69 @@ bool Sema::CheckCXXThisCapture(SourceLocation Loc, bool Explicit,
       if (LSI && isGenericLambdaCallOperatorSpecialization(LSI->CallOperator)) {
         // This context can't implicitly capture 'this'; fail out.
         if (BuildAndDiagnose)
-          Diag(Loc, diag::err_this_capture) << Explicit;
+          Diag(Loc, diag::err_this_capture)
+              << (Explicit && idx == MaxFunctionScopesIndex);
         return true;
       }
       if (CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_LambdaByref ||
           CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_LambdaByval ||
           CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_Block ||
           CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_CapturedRegion ||
-          Explicit) {
+          (Explicit && idx == MaxFunctionScopesIndex)) {
+        // Regarding (Explicit && idx == MaxFunctionScopesIndex): only the first
+        // iteration through can be an explicit capture, all enclosing closures,
+        // if any, must perform implicit captures.
+
         // This closure can capture 'this'; continue looking upwards.
-        NumClosures++;
-        Explicit = false;
+        NumCapturingClosures++;
         continue;
       }
       // This context can't implicitly capture 'this'; fail out.
       if (BuildAndDiagnose)
-        Diag(Loc, diag::err_this_capture) << Explicit;
+        Diag(Loc, diag::err_this_capture)
+            << (Explicit && idx == MaxFunctionScopesIndex);
       return true;
     }
     break;
   }
   if (!BuildAndDiagnose) return false;
-  // Mark that we're implicitly capturing 'this' in all the scopes we skipped.
+
+  // If we got here, then the closure at MaxFunctionScopesIndex on the
+  // FunctionScopes stack, can capture the *enclosing object*, so capture it
+  // (including implicit by-reference captures in any enclosing closures).
+
+  // In the loop below, respect the ByCopy flag only for the closure requesting
+  // the capture (i.e. first iteration through the loop below).  Ignore it for
+  // all enclosing closure's upto NumCapturingClosures (since they must be
+  // implicitly capturing the *enclosing  object* by reference (see loop
+  // above)).
+  assert((!ByCopy ||
+          dyn_cast<LambdaScopeInfo>(FunctionScopes[MaxFunctionScopesIndex])) &&
+         "Only a lambda can capture the enclosing object (referred to by "
+         "*this) by copy");
   // FIXME: We need to delay this marking in PotentiallyPotentiallyEvaluated
   // contexts.
-  for (unsigned idx = MaxFunctionScopesIndex; NumClosures; 
-      --idx, --NumClosures) {
+
+  for (unsigned idx = MaxFunctionScopesIndex; NumCapturingClosures; 
+      --idx, --NumCapturingClosures) {
     CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FunctionScopes[idx]);
     Expr *ThisExpr = nullptr;
     QualType ThisTy = getCurrentThisType();
-    if (LambdaScopeInfo *LSI = dyn_cast<LambdaScopeInfo>(CSI))
-      // For lambda expressions, build a field and an initializing expression.
-      ThisExpr = captureThis(Context, LSI->Lambda, ThisTy, Loc);
-    else if (CapturedRegionScopeInfo *RSI
+    if (LambdaScopeInfo *LSI = dyn_cast<LambdaScopeInfo>(CSI)) {
+      // For lambda expressions, build a field and an initializing expression,
+      // and capture the *enclosing object* by copy only if this is the first
+      // iteration.
+      ThisExpr = captureThis(*this, Context, LSI->Lambda, ThisTy, Loc,
+                             ByCopy && idx == MaxFunctionScopesIndex);
+
+    } else if (CapturedRegionScopeInfo *RSI
         = dyn_cast<CapturedRegionScopeInfo>(FunctionScopes[idx]))
-      ThisExpr = captureThis(Context, RSI->TheRecordDecl, ThisTy, Loc);
+      ThisExpr =
+          captureThis(*this, Context, RSI->TheRecordDecl, ThisTy, Loc,
+                      false/*ByCopy*/);
 
-    bool isNested = NumClosures > 1;
-    CSI->addThisCapture(isNested, Loc, ThisTy, ThisExpr);
+    bool isNested = NumCapturingClosures > 1;
+    CSI->addThisCapture(isNested, Loc, ThisTy, ThisExpr, ByCopy);
   }
   return false;
 }

diff --git a/clang/lib/Sema/SemaLambda.cpp b/clang/lib/Sema/SemaLambda.cpp
@@ -924,7 +924,12 @@ void Sema::ActOnStartOfLambdaDefinition(LambdaIntroducer &Intro,
     = Intro.Default == LCD_None? Intro.Range.getBegin() : Intro.DefaultLoc;
   for (auto C = Intro.Captures.begin(), E = Intro.Captures.end(); C != E;
        PrevCaptureLoc = C->Loc, ++C) {
-    if (C->Kind == LCK_This) {
+    if (C->Kind == LCK_This || C->Kind == LCK_StarThis) {
+      if (C->Kind == LCK_StarThis) 
+        Diag(C->Loc, !getLangOpts().CPlusPlus1z
+                             ? diag::ext_star_this_lambda_capture_cxx1z
+                             : diag::warn_cxx14_compat_star_this_lambda_capture);
+
       // C++11 [expr.prim.lambda]p8:
       //   An identifier or this shall not appear more than once in a 
       //   lambda-capture.
@@ -936,10 +941,12 @@ void Sema::ActOnStartOfLambdaDefinition(LambdaIntroducer &Intro,
         continue;
       }
 
-      // C++11 [expr.prim.lambda]p8:
-      //   If a lambda-capture includes a capture-default that is =, the 
-      //   lambda-capture shall not contain this [...].
-      if (Intro.Default == LCD_ByCopy) {
+      // C++1z [expr.prim.lambda]p8:
+      //  If a lambda-capture includes a capture-default that is =, each
+      //  simple-capture of that lambda-capture shall be of the form "&
+      //  identifier" or "* this". [ Note: The form [&,this] is redundant but
+      //  accepted for compatibility with ISO C++14. --end note ]
+      if (Intro.Default == LCD_ByCopy && C->Kind != LCK_StarThis) {
         Diag(C->Loc, diag::err_this_capture_with_copy_default)
             << FixItHint::CreateRemoval(
                 SourceRange(getLocForEndOfToken(PrevCaptureLoc), C->Loc));
@@ -955,7 +962,9 @@ void Sema::ActOnStartOfLambdaDefinition(LambdaIntroducer &Intro,
         continue;
       }
 
-      CheckCXXThisCapture(C->Loc, /*Explicit=*/true);
+      CheckCXXThisCapture(C->Loc, /*Explicit=*/true, /*BuildAndDiagnose*/ true,
+                          /*FunctionScopeIndexToStopAtPtr*/ nullptr,
+                          C->Kind == LCK_StarThis);
       continue;
     }
 
@@ -1529,10 +1538,9 @@ ExprResult Sema::BuildLambdaExpr(SourceLocation StartLoc, SourceLocation EndLoc,
       // Handle 'this' capture.
       if (From.isThisCapture()) {
         Captures.push_back(
-            LambdaCapture(From.getLocation(), IsImplicit, LCK_This));
-        CaptureInits.push_back(new (Context) CXXThisExpr(From.getLocation(),
-                                                         getCurrentThisType(),
-                                                         /*isImplicit=*/true));
+            LambdaCapture(From.getLocation(), IsImplicit,
+                          From.isCopyCapture() ? LCK_StarThis : LCK_This));
+        CaptureInits.push_back(From.getInitExpr());
         ArrayIndexStarts.push_back(ArrayIndexVars.size());
         continue;
       }

diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
@@ -10089,7 +10089,9 @@ TreeTransform<Derived>::TransformLambdaExpr(LambdaExpr *E) {
 
     // Capturing 'this' is trivial.
     if (C->capturesThis()) {
-      getSema().CheckCXXThisCapture(C->getLocation(), C->isExplicit());
+      getSema().CheckCXXThisCapture(C->getLocation(), C->isExplicit(),
+                                    /*BuildAndDiagnose*/ true, nullptr,
+                                    C->getCaptureKind() == LCK_StarThis);
       continue;
     }
     // Captured expression will be recaptured during captured variables

diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp b/clang/lib/Serialization/ASTReaderDecl.cpp
@@ -1497,6 +1497,7 @@ void ASTDeclReader::ReadCXXDefinitionData(
       bool IsImplicit = Record[Idx++];
       LambdaCaptureKind Kind = static_cast<LambdaCaptureKind>(Record[Idx++]);
       switch (Kind) {
+      case LCK_StarThis: 
       case LCK_This:
       case LCK_VLAType:
         *ToCapture++ = Capture(Loc, IsImplicit, Kind, nullptr,SourceLocation());

diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
@@ -5631,6 +5631,7 @@ void ASTWriter::AddCXXDefinitionData(const CXXRecordDecl *D, RecordDataImpl &Rec
       Record.push_back(Capture.isImplicit());
       Record.push_back(Capture.getCaptureKind());
       switch (Capture.getCaptureKind()) {
+      case LCK_StarThis:
       case LCK_This:
       case LCK_VLAType:
         break;

diff --git a/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p15-star-this-capture.cpp b/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p15-star-this-capture.cpp
@@ -0,0 +1,22 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c++1z %s -verify
+
+class NonCopyable {
+  NonCopyable(const NonCopyable&) = delete; //expected-note3{{explicitly marked deleted here}}
+  int x = 10;
+  void foo() {
+    auto L = [this] { return x; };
+    const auto &M = [*this] { return x; };//expected-error{{call to deleted}}
+    const auto &M2 = [this] () -> auto&& {
+      ++x;
+      return [*this] {  //expected-error{{call to deleted}} expected-warning{{reference to local}}
+         return ++x; //expected-error{{read-only}}
+      }; 
+    };
+    const auto &M3 = [*this] () mutable -> auto&& { //expected-error{{call to deleted}} 
+      ++x;
+      return [this] {  // expected-warning{{reference to local}}
+         return x;
+      }; 
+    };
+  }  
+};
diff --git a/clang/test/CodeGenCXX/cxx1z-lambda-star-this.cpp b/clang/test/CodeGenCXX/cxx1z-lambda-star-this.cpp
@@ -0,0 +1,31 @@
+// RUN: %clang_cc1 -std=c++1y -triple i686-pc-windows-msvc -emit-llvm %s -o - | FileCheck %s
+//CHECK: %[[A_LAMBDA:.*]] = type { %struct.A }
+//CHECK: %[[B_LAMBDA:.*]] = type { %struct.B* }
+struct A {
+  double a = 111;
+  auto foo() { return [*this] { return a; }; }
+};
+
+namespace ns1 {
+int X = A{}.foo()();
+} //end ns1
+
+//CHECK: @"\01?foo@A@@QAE?A?<auto>@@XZ"(%struct.A* %this, %class.anon* noalias sret %[[A_LAMBDA_RETVAL:.*]])
+// get the first object with the closure type, which is of type 'struct.A'
+//CHECK: %0 = getelementptr inbounds %[[A_LAMBDA]], %[[A_LAMBDA]]* %[[A_LAMBDA_RETVAL]], i32 0, i32 0
+//CHECK: %1 = bitcast %struct.A* %0 to i8*
+//CHECK: %2 = bitcast %struct.A* %this1 to i8*
+// copy the contents ...
+//CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %1, i8* %2, i32 8, i32 8, i1 false)
+
+struct B {
+  double b = 222;
+  auto bar() { return [this] { return b; }; };
+};
+
+namespace ns2 {
+int X = B{}.bar()();
+}
+//CHECK: @"\01?bar@B@@QAE?A?<auto>@@XZ"(%struct.B* %this, %class.anon.0* noalias sret %agg.result)
+//CHECK: %0 = getelementptr inbounds %class.anon.0, %class.anon.0* %agg.result, i32 0, i32 0
+//CHECK: store %struct.B* %this1, %struct.B** %0, align 4
diff --git a/clang/test/SemaCXX/cxx1z-lambda-star-this.cpp b/clang/test/SemaCXX/cxx1z-lambda-star-this.cpp
@@ -0,0 +1,72 @@
+// RUN: %clang_cc1 -std=c++1z -verify -fsyntax-only -fblocks -emit-llvm-only %s
+// RUN: %clang_cc1 -std=c++1z -verify -fsyntax-only -fblocks -fdelayed-template-parsing %s -DDELAYED_TEMPLATE_PARSING
+// RUN: %clang_cc1 -std=c++1z -verify -fsyntax-only -fblocks -fms-extensions %s -DMS_EXTENSIONS
+// RUN: %clang_cc1 -std=c++1z -verify -fsyntax-only -fblocks -fdelayed-template-parsing -fms-extensions %s -DMS_EXTENSIONS -DDELAYED_TEMPLATE_PARSING
+
+
+namespace test_star_this {
+namespace ns1 {
+class A {
+  int x = 345;
+  auto foo() {
+    (void) [*this, this] { };  //expected-error{{'this' can appear only once}}
+    (void) [this] { ++x; };
+    (void) [*this] { ++x; };  //expected-error{{read-only variable}}
+    (void) [*this] () mutable { ++x; };
+    (void) [=] { return x; };
+    (void) [&, this] { return x; };
+    (void) [=, *this] { return x; };
+    (void) [&, *this] { return x; };
+  }
+};
+} // end ns1
+
+namespace ns2 {
+  class B {
+    B(const B&) = delete; //expected-note{{deleted here}}
+    int *x = (int *) 456;
+    void foo() {
+      (void)[this] { return x; };
+      (void)[*this] { return x; }; //expected-error{{call to deleted}}
+    }
+  };
+} // end ns2
+namespace ns3 {
+  class B {
+    B(const B&) = delete; //expected-note2{{deleted here}}
+
+    int *x = (int *) 456;
+    public: 
+    template<class T = int>
+    void foo() {
+      (void)[this] { return x; };
+      (void)[*this] { return x; }; //expected-error2{{call to deleted}}
+    }
+
+    B() = default;
+  } b;
+  B *c = (b.foo(), nullptr); //expected-note{{in instantiation}}
+} // end ns3
+
+namespace ns4 {
+template<class U>
+class B {
+  B(const B&) = delete; //expected-note{{deleted here}}
+  double d = 3.14;
+  public: 
+  template<class T = int>
+  auto foo() {
+    const auto &L = [*this] (auto a) mutable { //expected-error{{call to deleted}}
+      d += a; 
+      return [this] (auto b) { return d +=b; }; 
+    }; 
+  }
+
+  B() = default;
+};
+void main() {
+  B<int*> b;
+  b.foo(); //expected-note{{in instantiation}}
+} // end main  
+} // end ns4
+} //end ns test_star_this
diff --git a/clang/www/cxx_status.html b/clang/www/cxx_status.html
@@ -659,7 +659,7 @@ <h2 id="cxx17">C++1z implementation status</h2>
     <tr>
       <td>Lambda capture of <tt>*this</tt></td>
       <td><a href="http://wg21.link/p0018r3">P0018R3</a></td>
-      <td class="none" align="center">No</td>
+      <td class="svn" align="center">SVN</td>
     </tr>
     <tr>
       <td>Direct-list-initialization of <tt>enum</tt>s</td>