Implement a new type trait __is_trivially_constructible(T, Args...)

that provides the behavior of the C++11 library trait
std::is_trivially_constructible<T, Args...>, which can't be
implemented purely as a library.

Since __is_trivially_constructible can have zero or more arguments, I
needed to add Yet Another Type Trait Expression Class, this one
handling arbitrary arguments. The next step will be to migrate
UnaryTypeTrait and BinaryTypeTrait over to this new, more general
TypeTrait class.

Fixes the Clang side of <rdar://problem/10895483> / PR12038.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151352 91177308-0d34-0410-b5e6-96231b3b80d8

33 files changed, 656 insertions, 6 deletions

diff --git a/docs/LanguageExtensions.html b/docs/LanguageExtensions.html
index d38f5d05ce..2471c60776 100644
--- a/docs/LanguageExtensions.html
+++ b/docs/LanguageExtensions.html
@@ -889,6 +889,8 @@ struct is_convertible_to {
   <li><code>__is_literal(type)</code>: Determines whether the given type is a literal type</li>
   <li><code>__is_final</code>: Determines whether the given type is declared with a <code>final</code> class-virt-specifier.</li>
   <li><code>__underlying_type(type)</code>: Retrieves the underlying type for a given <code>enum</code> type. This trait is required to implement the C++11 standard library.</li>
+  <li><code>__is_trivially_assignable(totype, fromtype)</code>: Determines whether a value of type <tt>totype</tt> can be assigned to from a value of type <tt>fromtype</tt> such that no non-trivial functions are called as part of that assignment. This trait is required to implement the C++11 standard library.</li>
+  <li><code>__is_trivially_constructible(type, argtypes...)</code>: Determines whether a value of type <tt>type</tt> can be direct-initialized with arguments of types <tt>argtypes...</tt> such that no non-trivial functions are called as part of that initialization. This trait is required to implement the C++11 standard library.</li>
 </ul>
 
 <!-- ======================================================================= -->
diff --git a/include/clang/AST/ExprCXX.h b/include/clang/AST/ExprCXX.h
index f21ba1f3b7..40050c3d2c 100644
--- a/include/clang/AST/ExprCXX.h
+++ b/include/clang/AST/ExprCXX.h
@@ -1926,6 +1926,102 @@ public:
   friend class ASTStmtReader;
 };
 
+/// \brief A type trait used in the implementation of various C++11 and
+/// Library TR1 trait templates.
+///
+/// \code
+///   __is_trivially_constructible(vector<int>, int*, int*)
+/// \endcode
+class TypeTraitExpr : public Expr {
+  /// \brief The location of the type trait keyword.
+  SourceLocation Loc;
+  
+  /// \brief  The location of the closing parenthesis.
+  SourceLocation RParenLoc;
+  
+  // Note: The TypeSourceInfos for the arguments are allocated after the
+  // TypeTraitExpr.
+  
+  TypeTraitExpr(QualType T, SourceLocation Loc, TypeTrait Kind,
+                ArrayRef<TypeSourceInfo *> Args,
+                SourceLocation RParenLoc,
+                bool Value);
+
+  TypeTraitExpr(EmptyShell Empty) : Expr(TypeTraitExprClass, Empty) { }
+
+  /// \brief Retrieve the argument types.
+  TypeSourceInfo **getTypeSourceInfos() {
+    return reinterpret_cast<TypeSourceInfo **>(this+1);
+  }
+  
+  /// \brief Retrieve the argument types.
+  TypeSourceInfo * const *getTypeSourceInfos() const {
+    return reinterpret_cast<TypeSourceInfo * const*>(this+1);
+  }
+  
+public:
+  /// \brief Create a new type trait expression.
+  static TypeTraitExpr *Create(ASTContext &C, QualType T, SourceLocation Loc, 
+                               TypeTrait Kind,
+                               ArrayRef<TypeSourceInfo *> Args,
+                               SourceLocation RParenLoc,
+                               bool Value);
+
+  static TypeTraitExpr *CreateDeserialized(ASTContext &C, unsigned NumArgs);
+  
+  /// \brief Determine which type trait this expression uses.
+  TypeTrait getTrait() const {
+    return static_cast<TypeTrait>(TypeTraitExprBits.Kind);
+  }
+
+  bool getValue() const { 
+    assert(!isValueDependent()); 
+    return TypeTraitExprBits.Value; 
+  }
+  
+  /// \brief Determine the number of arguments to this type trait.
+  unsigned getNumArgs() const { return TypeTraitExprBits.NumArgs; }
+  
+  /// \brief Retrieve the Ith argument.
+  TypeSourceInfo *getArg(unsigned I) const {
+    assert(I < getNumArgs() && "Argument out-of-range");
+    return getArgs()[I];
+  }
+  
+  /// \brief Retrieve the argument types.
+  ArrayRef<TypeSourceInfo *> getArgs() const { 
+    return ArrayRef<TypeSourceInfo *>(getTypeSourceInfos(), getNumArgs());
+  }
+  
+  typedef TypeSourceInfo **arg_iterator;
+  arg_iterator arg_begin() { 
+    return getTypeSourceInfos(); 
+  }
+  arg_iterator arg_end() { 
+    return getTypeSourceInfos() + getNumArgs(); 
+  }
+
+  typedef TypeSourceInfo const * const *arg_const_iterator;
+  arg_const_iterator arg_begin() const { return getTypeSourceInfos(); }
+  arg_const_iterator arg_end() const { 
+    return getTypeSourceInfos() + getNumArgs(); 
+  }
+
+  SourceRange getSourceRange() const { return SourceRange(Loc, RParenLoc); }
+  
+  static bool classof(const Stmt *T) {
+    return T->getStmtClass() == TypeTraitExprClass;
+  }
+  static bool classof(const TypeTraitExpr *) { return true; }
+  
+  // Iterators
+  child_range children() { return child_range(); }
+  
+  friend class ASTStmtReader;
+  friend class ASTStmtWriter;
+
+};
+  
 /// ArrayTypeTraitExpr - An Embarcadero array type trait, as used in the
 /// implementation of __array_rank and __array_extent.
 /// Example:
diff --git a/include/clang/AST/RecursiveASTVisitor.h b/include/clang/AST/RecursiveASTVisitor.h
index a0f4950a04..a1214a9d25 100644
--- a/include/clang/AST/RecursiveASTVisitor.h
+++ b/include/clang/AST/RecursiveASTVisitor.h
@@ -1946,6 +1946,11 @@ DEF_TRAVERSE_STMT(BinaryTypeTraitExpr, {
     TRY_TO(TraverseTypeLoc(S->getRhsTypeSourceInfo()->getTypeLoc()));
   })
 
+DEF_TRAVERSE_STMT(TypeTraitExpr, {
+  for (unsigned I = 0, N = S->getNumArgs(); I != N; ++I)
+    TRY_TO(TraverseTypeLoc(S->getArg(I)->getTypeLoc()));
+})
+
 DEF_TRAVERSE_STMT(ArrayTypeTraitExpr, {
     TRY_TO(TraverseTypeLoc(S->getQueriedTypeSourceInfo()->getTypeLoc()));
   })
diff --git a/include/clang/AST/Stmt.h b/include/clang/AST/Stmt.h
index be2b706fac..1bc0c11ef5 100644
--- a/include/clang/AST/Stmt.h
+++ b/include/clang/AST/Stmt.h
@@ -227,6 +227,24 @@ protected:
     unsigned InitializesStdInitializerList : 1;
   };
 
+  class TypeTraitExprBitfields {
+    friend class TypeTraitExpr;
+    friend class ASTStmtReader;
+    friend class ASTStmtWriter;
+    
+    unsigned : NumExprBits;
+    
+    /// \brief The kind of type trait, which is a value of a TypeTrait enumerator.
+    unsigned Kind : 8;
+    
+    /// \brief If this expression is not value-dependent, this indicates whether
+    /// the trait evaluated true or false.
+    unsigned Value : 1;
+
+    /// \brief The number of arguments to this type trait.
+    unsigned NumArgs : 32 - 8 - 1 - NumExprBits;
+  };
+  
   union {
     // FIXME: this is wasteful on 64-bit platforms.
     void *Aligner;
@@ -241,9 +259,11 @@ protected:
     PseudoObjectExprBitfields PseudoObjectExprBits;
     ObjCIndirectCopyRestoreExprBitfields ObjCIndirectCopyRestoreExprBits;
     InitListExprBitfields InitListExprBits;
+    TypeTraitExprBitfields TypeTraitExprBits;
   };
 
   friend class ASTStmtReader;
+  friend class ASTStmtWriter;
 
 public:
   // Only allow allocation of Stmts using the allocator in ASTContext
diff --git a/include/clang/Basic/DiagnosticSemaKinds.td b/include/clang/Basic/DiagnosticSemaKinds.td
index 4e60edf37d..bfece366f1 100644
--- a/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/include/clang/Basic/DiagnosticSemaKinds.td
@@ -4438,6 +4438,10 @@ def note_inequality_comparison_to_or_assign : Note<
 
 def err_incomplete_type_used_in_type_trait_expr : Error<
   "incomplete type %0 used in type trait expression">;
+def err_type_trait_arity : Error<
+  "type trait requires %0%select{| or more}1 argument%select{|s}2; have "
+  "%3 argument%s3">;
+  
 def err_dimension_expr_not_constant_integer : Error<
   "dimension expression does not evaluate to a constant unsigned int">;
 def err_expected_ident_or_lparen : Error<"expected identifier or '('">;
diff --git a/include/clang/Basic/StmtNodes.td b/include/clang/Basic/StmtNodes.td
index d728221869..07bb227b82 100644
--- a/include/clang/Basic/StmtNodes.td
+++ b/include/clang/Basic/StmtNodes.td
@@ -107,6 +107,7 @@ def CXXScalarValueInitExpr : DStmt<Expr>;
 def CXXNewExpr : DStmt<Expr>;
 def CXXDeleteExpr : DStmt<Expr>;
 def CXXPseudoDestructorExpr : DStmt<Expr>;
+def TypeTraitExpr : DStmt<Expr>;
 def UnaryTypeTraitExpr : DStmt<Expr>;
 def BinaryTypeTraitExpr : DStmt<Expr>;
 def ArrayTypeTraitExpr : DStmt<Expr>;
diff --git a/include/clang/Basic/TokenKinds.def b/include/clang/Basic/TokenKinds.def
index 300db4d886..74072ba16a 100644
--- a/include/clang/Basic/TokenKinds.def
+++ b/include/clang/Basic/TokenKinds.def
@@ -365,6 +365,7 @@ KEYWORD(__is_trivial                , KEYCXX)
 KEYWORD(__is_union                  , KEYCXX)
 
 // Clang-only C++ Type Traits
+KEYWORD(__is_trivially_constructible, KEYCXX)
 KEYWORD(__is_trivially_copyable     , KEYCXX)
 KEYWORD(__is_trivially_assignable   , KEYCXX)
 KEYWORD(__underlying_type           , KEYCXX)
diff --git a/include/clang/Basic/TypeTraits.h b/include/clang/Basic/TypeTraits.h
index 6ed2adfaf5..721f44f408 100644
--- a/include/clang/Basic/TypeTraits.h
+++ b/include/clang/Basic/TypeTraits.h
@@ -84,6 +84,12 @@ namespace clang {
     UETT_AlignOf,
     UETT_VecStep
   };
+  
+  /// \brief Names for type traits that operate specifically on types.
+  enum TypeTrait {
+    TT_IsTriviallyConstructible
+  };
+  
 }
 
 #endif
diff --git a/include/clang/Parse/Parser.h b/include/clang/Parse/Parser.h
index 64736118e1..e7834edac7 100644
--- a/include/clang/Parse/Parser.h
+++ b/include/clang/Parse/Parser.h
@@ -2170,7 +2170,8 @@ private:
   // GNU G++: Type Traits [Type-Traits.html in the GCC manual]
   ExprResult ParseUnaryTypeTrait();
   ExprResult ParseBinaryTypeTrait();
-
+  ExprResult ParseTypeTrait();
+  
   //===--------------------------------------------------------------------===//
   // Embarcadero: Arary and Expression Traits
   ExprResult ParseArrayTypeTrait();
diff --git a/include/clang/Sema/Sema.h b/include/clang/Sema/Sema.h
index 7aed347d41..8131c6372e 100644
--- a/include/clang/Sema/Sema.h
+++ b/include/clang/Sema/Sema.h
@@ -3317,6 +3317,14 @@ public:
                                   TypeSourceInfo *RhsT,
                                   SourceLocation RParen);
 
+  /// \brief Parsed one of the type trait support pseudo-functions.
+  ExprResult ActOnTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
+                            ArrayRef<ParsedType> Args,
+                            SourceLocation RParenLoc);
+  ExprResult BuildTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
+                            ArrayRef<TypeSourceInfo *> Args,
+                            SourceLocation RParenLoc);
+  
   /// ActOnArrayTypeTrait - Parsed one of the bianry type trait support
   /// pseudo-functions.
   ExprResult ActOnArrayTypeTrait(ArrayTypeTrait ATT,
diff --git a/include/clang/Serialization/ASTBitCodes.h b/include/clang/Serialization/ASTBitCodes.h
index 7ec2cac7ff..7de6b4589a 100644
--- a/include/clang/Serialization/ASTBitCodes.h
+++ b/include/clang/Serialization/ASTBitCodes.h
@@ -1156,6 +1156,7 @@ namespace clang {
       EXPR_OPAQUE_VALUE,          // OpaqueValueExpr
       EXPR_BINARY_CONDITIONAL_OPERATOR,  // BinaryConditionalOperator
       EXPR_BINARY_TYPE_TRAIT,     // BinaryTypeTraitExpr
+      EXPR_TYPE_TRAIT,            // TypeTraitExpr
       EXPR_ARRAY_TYPE_TRAIT,      // ArrayTypeTraitIntExpr
       
       EXPR_PACK_EXPANSION,        // PackExpansionExpr
diff --git a/lib/AST/Expr.cpp b/lib/AST/Expr.cpp
index a1770c915a..37df90407d 100644
--- a/lib/AST/Expr.cpp
+++ b/lib/AST/Expr.cpp
@@ -2169,6 +2169,7 @@ Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const {
   case AddrLabelExprClass:
   case ArrayTypeTraitExprClass:
   case BinaryTypeTraitExprClass:
+  case TypeTraitExprClass:
   case CXXBoolLiteralExprClass:
   case CXXNoexceptExprClass:
   case CXXNullPtrLiteralExprClass:
diff --git a/lib/AST/ExprCXX.cpp b/lib/AST/ExprCXX.cpp
index 7ef3417e6d..da89bf2798 100644
--- a/lib/AST/ExprCXX.cpp
+++ b/lib/AST/ExprCXX.cpp
@@ -199,7 +199,6 @@ SourceRange CXXPseudoDestructorExpr::getSourceRange() const {
   return SourceRange(Base->getLocStart(), End);
 }
 
-
 // UnresolvedLookupExpr
 UnresolvedLookupExpr *
 UnresolvedLookupExpr::Create(ASTContext &C, 
@@ -1262,4 +1261,51 @@ TemplateArgument SubstNonTypeTemplateParmPackExpr::getArgumentPack() const {
   return TemplateArgument(Arguments, NumArguments);
 }
 
+TypeTraitExpr::TypeTraitExpr(QualType T, SourceLocation Loc, TypeTrait Kind,
+                             ArrayRef<TypeSourceInfo *> Args,
+                             SourceLocation RParenLoc,
+                             bool Value)
+  : Expr(TypeTraitExprClass, T, VK_RValue, OK_Ordinary,
+         /*TypeDependent=*/false,
+         /*ValueDependent=*/false,
+         /*InstantiationDependent=*/false,
+         /*ContainsUnexpandedParameterPack=*/false),
+    Loc(Loc), RParenLoc(RParenLoc)
+{
+  TypeTraitExprBits.Kind = Kind;
+  TypeTraitExprBits.Value = Value;
+  TypeTraitExprBits.NumArgs = Args.size();
+
+  TypeSourceInfo **ToArgs = getTypeSourceInfos();
+  
+  for (unsigned I = 0, N = Args.size(); I != N; ++I) {
+    if (Args[I]->getType()->isDependentType())
+      setValueDependent(true);
+    if (Args[I]->getType()->isInstantiationDependentType())
+      setInstantiationDependent(true);
+    if (Args[I]->getType()->containsUnexpandedParameterPack())
+      setContainsUnexpandedParameterPack(true);
+    
+    ToArgs[I] = Args[I];
+  }
+}
+
+TypeTraitExpr *TypeTraitExpr::Create(ASTContext &C, QualType T, 
+                                     SourceLocation Loc, 
+                                     TypeTrait Kind,
+                                     ArrayRef<TypeSourceInfo *> Args,
+                                     SourceLocation RParenLoc,
+                                     bool Value) {
+  unsigned Size = sizeof(TypeTraitExpr) + sizeof(TypeSourceInfo*) * Args.size();
+  void *Mem = C.Allocate(Size);
+  return new (Mem) TypeTraitExpr(T, Loc, Kind, Args, RParenLoc, Value);
+}
+
+TypeTraitExpr *TypeTraitExpr::CreateDeserialized(ASTContext &C,
+                                                 unsigned NumArgs) {
+  unsigned Size = sizeof(TypeTraitExpr) + sizeof(TypeSourceInfo*) * NumArgs;
+  void *Mem = C.Allocate(Size);
+  return new (Mem) TypeTraitExpr(EmptyShell());
+}
+
 void ArrayTypeTraitExpr::anchor() { }
diff --git a/lib/AST/ExprClassification.cpp b/lib/AST/ExprClassification.cpp
index 79d8dc48fe..1b04428fae 100644
--- a/lib/AST/ExprClassification.cpp
+++ b/lib/AST/ExprClassification.cpp
@@ -151,6 +151,7 @@ static Cl::Kinds ClassifyInternal(ASTContext &Ctx, const Expr *E) {
   case Expr::CXXScalarValueInitExprClass:
   case Expr::UnaryTypeTraitExprClass:
   case Expr::BinaryTypeTraitExprClass:
+  case Expr::TypeTraitExprClass:
   case Expr::ArrayTypeTraitExprClass:
   case Expr::ExpressionTraitExprClass:
   case Expr::ObjCSelectorExprClass:
diff --git a/lib/AST/ExprConstant.cpp b/lib/AST/ExprConstant.cpp
index ed64153f85..85aa5ee81e 100644
--- a/lib/AST/ExprConstant.cpp
+++ b/lib/AST/ExprConstant.cpp
@@ -4119,6 +4119,10 @@ public:
     return Success(E->getValue(), E);
   }
 
+  bool VisitTypeTraitExpr(const TypeTraitExpr *E) {
+    return Success(E->getValue(), E);
+  }
+
   bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) {
     return Success(E->getValue(), E);
   }
@@ -6360,6 +6364,7 @@ static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) {
   case Expr::CXXScalarValueInitExprClass:
   case Expr::UnaryTypeTraitExprClass:
   case Expr::BinaryTypeTraitExprClass:
+  case Expr::TypeTraitExprClass:
   case Expr::ArrayTypeTraitExprClass:
   case Expr::ExpressionTraitExprClass:
   case Expr::CXXNoexceptExprClass:
diff --git a/lib/AST/ItaniumMangle.cpp b/lib/AST/ItaniumMangle.cpp
index 5e167f58dc..91e6ee5c97 100644
--- a/lib/AST/ItaniumMangle.cpp
+++ b/lib/AST/ItaniumMangle.cpp
@@ -2383,6 +2383,7 @@ recurse:
   case Expr::StmtExprClass:
   case Expr::UnaryTypeTraitExprClass:
   case Expr::BinaryTypeTraitExprClass:
+  case Expr::TypeTraitExprClass:
   case Expr::ArrayTypeTraitExprClass:
   case Expr::ExpressionTraitExprClass:
   case Expr::VAArgExprClass:
diff --git a/lib/AST/StmtPrinter.cpp b/lib/AST/StmtPrinter.cpp
index 51296ad5f4..6d3e783f22 100644
--- a/lib/AST/StmtPrinter.cpp
+++ b/lib/AST/StmtPrinter.cpp
@@ -1555,6 +1555,13 @@ static const char *getTypeTraitName(BinaryTypeTrait BTT) {
   llvm_unreachable("Binary type trait not covered by switch");
 }
 
+static const char *getTypeTraitName(TypeTrait TT) {
+  switch (TT) {
+  case clang::TT_IsTriviallyConstructible:return "__is_trivially_constructible";
+  }
+  llvm_unreachable("Type trait not covered by switch");
+}
+
 static const char *getTypeTraitName(ArrayTypeTrait ATT) {
   switch (ATT) {
   case ATT_ArrayRank:        return "__array_rank";
@@ -1582,6 +1589,16 @@ void StmtPrinter::VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *E) {
      << E->getRhsType().getAsString(Policy) << ")";
 }
 
+void StmtPrinter::VisitTypeTraitExpr(TypeTraitExpr *E) {
+  OS << getTypeTraitName(E->getTrait()) << "(";
+  for (unsigned I = 0, N = E->getNumArgs(); I != N; ++I) {
+    if (I > 0)
+      OS << ", ";
+    OS << E->getArg(I)->getType().getAsString(Policy);
+  }
+  OS << ")";
+}
+
 void StmtPrinter::VisitArrayTypeTraitExpr(ArrayTypeTraitExpr *E) {
   OS << getTypeTraitName(E->getTrait()) << "("
      << E->getQueriedType().getAsString(Policy) << ")";
diff --git a/lib/AST/StmtProfile.cpp b/lib/AST/StmtProfile.cpp
index fdd0c8502d..643bca817c 100644
--- a/lib/AST/StmtProfile.cpp
+++ b/lib/AST/StmtProfile.cpp
@@ -868,6 +868,14 @@ void StmtProfiler::VisitBinaryTypeTraitExpr(const BinaryTypeTraitExpr *S) {
   VisitType(S->getRhsType());
 }
 
+void StmtProfiler::VisitTypeTraitExpr(const TypeTraitExpr *S) {
+  VisitExpr(S);
+  ID.AddInteger(S->getTrait());
+  ID.AddInteger(S->getNumArgs());
+  for (unsigned I = 0, N = S->getNumArgs(); I != N; ++I)
+    VisitType(S->getArg(I)->getType());
+}
+
 void StmtProfiler::VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *S) {
   VisitExpr(S);
   ID.AddInteger(S->getTrait());
diff --git a/lib/Lex/PPMacroExpansion.cpp b/lib/Lex/PPMacroExpansion.cpp
index 0e00996410..bc34692702 100644
--- a/lib/Lex/PPMacroExpansion.cpp
+++ b/lib/Lex/PPMacroExpansion.cpp
@@ -701,6 +701,7 @@ static bool HasFeature(const Preprocessor &PP, const IdentifierInfo *II) {
            .Case("is_polymorphic", LangOpts.CPlusPlus)
            .Case("is_trivial", LangOpts.CPlusPlus)
            .Case("is_trivially_assignable", LangOpts.CPlusPlus)
+           .Case("is_trivially_constructible", LangOpts.CPlusPlus)
            .Case("is_trivially_copyable", LangOpts.CPlusPlus)
            .Case("is_union", LangOpts.CPlusPlus)
            .Case("modules", LangOpts.Modules)
diff --git a/lib/Parse/ParseExpr.cpp b/lib/Parse/ParseExpr.cpp
index fdf40e877c..62d1f494be 100644
--- a/lib/Parse/ParseExpr.cpp
+++ b/lib/Parse/ParseExpr.cpp
@@ -1143,6 +1143,9 @@ ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
   case tok::kw___is_trivially_assignable:
     return ParseBinaryTypeTrait();
 
+  case tok::kw___is_trivially_constructible:
+    return ParseTypeTrait();
+      
   case tok::kw___array_rank:
   case tok::kw___array_extent:
     return ParseArrayTypeTrait();
diff --git a/lib/Parse/ParseExprCXX.cpp b/lib/Parse/ParseExprCXX.cpp
index 19bc22020c..d8663077fd 100644
--- a/lib/Parse/ParseExprCXX.cpp
+++ b/lib/Parse/ParseExprCXX.cpp
@@ -2458,6 +2458,14 @@ static BinaryTypeTrait BinaryTypeTraitFromTokKind(tok::TokenKind kind) {
   }
 }
 
+static TypeTrait TypeTraitFromTokKind(tok::TokenKind kind) {
+  switch (kind) {
+  default: llvm_unreachable("Not a known type trait");
+  case tok::kw___is_trivially_constructible: 
+    return TT_IsTriviallyConstructible;
+  }
+}
+
 static ArrayTypeTrait ArrayTypeTraitFromTokKind(tok::TokenKind kind) {
   switch(kind) {
   default: llvm_unreachable("Not a known binary type trait");
@@ -2540,6 +2548,58 @@ ExprResult Parser::ParseBinaryTypeTrait() {
                                       T.getCloseLocation());
 }
 
+/// \brief Parse the built-in type-trait pseudo-functions that allow 
+/// implementation of the TR1/C++11 type traits templates.
+///
+///       primary-expression:
+///          type-trait '(' type-id-seq ')'
+///
+///       type-id-seq:
+///          type-id ...[opt] type-id-seq[opt]
+///
+ExprResult Parser::ParseTypeTrait() {
+  TypeTrait Kind = TypeTraitFromTokKind(Tok.getKind());
+  SourceLocation Loc = ConsumeToken();
+  
+  BalancedDelimiterTracker Parens(*this, tok::l_paren);
+  if (Parens.expectAndConsume(diag::err_expected_lparen))
+    return ExprError();
+
+  llvm::SmallVector<ParsedType, 2> Args;
+  do {
+    // Parse the next type.
+    TypeResult Ty = ParseTypeName();
+    if (Ty.isInvalid()) {
+      Parens.skipToEnd();
+      return ExprError();
+    }
+
+    // Parse the ellipsis, if present.
+    if (Tok.is(tok::ellipsis)) {
+      Ty = Actions.ActOnPackExpansion(Ty.get(), ConsumeToken());
+      if (Ty.isInvalid()) {
+        Parens.skipToEnd();
+        return ExprError();
+      }
+    }
+    
+    // Add this type to the list of arguments.
+    Args.push_back(Ty.get());
+    
+    if (Tok.is(tok::comma)) {
+      ConsumeToken();
+      continue;
+    }
+    
+    break;
+  } while (true);
+  
+  if (Parens.consumeClose())
+    return ExprError();
+  
+  return Actions.ActOnTypeTrait(Kind, Loc, Args, Parens.getCloseLocation());
+}
+
 /// ParseArrayTypeTrait - Parse the built-in array type-trait
 /// pseudo-functions.
 ///
diff --git a/lib/Parse/ParseTentative.cpp b/lib/Parse/ParseTentative.cpp
index 011c28aaf7..92ae770fa0 100644
--- a/lib/Parse/ParseTentative.cpp
+++ b/lib/Parse/ParseTentative.cpp
@@ -690,6 +690,7 @@ Parser::isExpressionOrTypeSpecifierSimple(tok::TokenKind Kind) {
   case tok::kw___is_polymorphic:
   case tok::kw___is_trivial:
   case tok::kw___is_trivially_assignable:
+  case tok::kw___is_trivially_constructible:
   case tok::kw___is_trivially_copyable:
   case tok::kw___is_union:
   case tok::kw___uuidof:
diff --git a/lib/Sema/SemaExprCXX.cpp b/lib/Sema/SemaExprCXX.cpp
index 708db1c9a9..a4ae9be41b 100644
--- a/lib/Sema/SemaExprCXX.cpp
+++ b/lib/Sema/SemaExprCXX.cpp
@@ -3212,6 +3212,127 @@ ExprResult Sema::ActOnBinaryTypeTrait(BinaryTypeTrait BTT,
   return BuildBinaryTypeTrait(BTT, KWLoc, LhsTSInfo, RhsTSInfo, RParen);
 }
 
+static bool evaluateTypeTrait(Sema &S, TypeTrait Kind, SourceLocation KWLoc,
+                              ArrayRef<TypeSourceInfo *> Args,
+                              SourceLocation RParenLoc) {
+  switch (Kind) {
+  case clang::TT_IsTriviallyConstructible: {
+    // C++11 [meta.unary.prop]:
+    //   is_trivially_constructor is defined as:
+    //
+    //     is_constructible<T, Args...>::value is true and the variable 
+    //
+    ///  definition for is_constructible, as defined below, is known to call no
+    //   operation that is not trivial.
+    //
+    //   The predicate condition for a template specialization 
+    //   is_constructible<T, Args...> shall be satisfied if and only if the 
+    //   following variable definition would be well-formed for some invented 
+    //   variable t:
+    //
+    //     T t(create<Args>()...);
+    if (Args.empty()) {
+      S.Diag(KWLoc, diag::err_type_trait_arity)
+        << 1 << 1 << 1 << (int)Args.size();
+      return false;
+    }
+    
+    bool SawVoid = false;
+    for (unsigned I = 0, N = Args.size(); I != N; ++I) {
+      if (Args[I]->getType()->isVoidType()) {
+        SawVoid = true;
+        continue;
+      }
+      
+      if (!Args[I]->getType()->isIncompleteType() &&
+        S.RequireCompleteType(KWLoc, Args[I]->getType(), 
+          diag::err_incomplete_type_used_in_type_trait_expr))
+        return false;
+    }
+    
+    // If any argument was 'void', of course it won't type-check.
+    if (SawVoid)
+      return false;
+    
+    llvm::SmallVector<OpaqueValueExpr, 2> OpaqueArgExprs;
+    llvm::SmallVector<Expr *, 2> ArgExprs;
+    ArgExprs.reserve(Args.size() - 1);
+    for (unsigned I = 1, N = Args.size(); I != N; ++I) {
+      QualType T = Args[I]->getType();
+      if (T->isObjectType() || T->isFunctionType())
+        T = S.Context.getRValueReferenceType(T);
+      OpaqueArgExprs.push_back(
+        OpaqueValueExpr(Args[I]->getTypeLoc().getSourceRange().getBegin(), 
+                        T.getNonLValueExprType(S.Context),
+                        Expr::getValueKindForType(T)));
+      ArgExprs.push_back(&OpaqueArgExprs.back());
+    }
+    
+    // Perform the initialization in an unevaluated context within a SFINAE 
+    // trap at translation unit scope.
+    EnterExpressionEvaluationContext Unevaluated(S, Sema::Unevaluated);
+    Sema::SFINAETrap SFINAE(S, /*AccessCheckingSFINAE=*/true);
+    Sema::ContextRAII TUContext(S, S.Context.getTranslationUnitDecl());
+    InitializedEntity To(InitializedEntity::InitializeTemporary(Args[0]));
+    InitializationKind InitKind(InitializationKind::CreateDirect(KWLoc, KWLoc,
+                                                                 RParenLoc));
+    InitializationSequence Init(S, To, InitKind, 
+                                ArgExprs.begin(), ArgExprs.size());
+    if (Init.Failed())
+      return false;
+    
+    ExprResult Result = Init.Perform(S, To, InitKind, 
+                                     MultiExprArg(ArgExprs.data(), 
+                                                  ArgExprs.size()));
+    if (Result.isInvalid() || SFINAE.hasErrorOccurred())
+      return false;
+    
+    // The initialization succeeded; not make sure there are no non-trivial 
+    // calls.
+    return !Result.get()->hasNonTrivialCall(S.Context);
+  }
+  }
+  
+  return false;
+}
+
+ExprResult Sema::BuildTypeTrait(TypeTrait Kind, SourceLocation KWLoc, 
+                                ArrayRef<TypeSourceInfo *> Args, 
+                                SourceLocation RParenLoc) {
+  bool Dependent = false;
+  for (unsigned I = 0, N = Args.size(); I != N; ++I) {
+    if (Args[I]->getType()->isDependentType()) {
+      Dependent = true;
+      break;
+    }
+  }
+  
+  bool Value = false;
+  if (!Dependent)
+    Value = evaluateTypeTrait(*this, Kind, KWLoc, Args, RParenLoc);
+  
+  return TypeTraitExpr::Create(Context, Context.BoolTy, KWLoc, Kind,
+                               Args, RParenLoc, Value);
+}
+
+ExprResult Sema::ActOnTypeTrait(TypeTrait Kind, SourceLocation KWLoc, 
+                                ArrayRef<ParsedType> Args, 
+                                SourceLocation RParenLoc) {
+  llvm::SmallVector<TypeSourceInfo *, 4> ConvertedArgs;
+  ConvertedArgs.reserve(Args.size());
+  
+  for (unsigned I = 0, N = Args.size(); I != N; ++I) {
+    TypeSourceInfo *TInfo;
+    QualType T = GetTypeFromParser(Args[I], &TInfo);
+    if (!TInfo)
+      TInfo = Context.getTrivialTypeSourceInfo(T, KWLoc);
+    
+    ConvertedArgs.push_back(TInfo);    
+  }
+  
+  return BuildTypeTrait(Kind, KWLoc, ConvertedArgs, RParenLoc);
+}
+
 static bool EvaluateBinaryTypeTrait(Sema &Self, BinaryTypeTrait BTT,
                                     QualType LhsT, QualType RhsT,
                                     SourceLocation KeyLoc) {
diff --git a/lib/Sema/TreeTransform.h b/lib/Sema/TreeTransform.h
index 58d6a22a28..f0b5f4e241 100644
--- a/lib/Sema/TreeTransform.h
+++ b/lib/Sema/TreeTransform.h
@@ -2022,6 +2022,17 @@ public:
     return getSema().BuildBinaryTypeTrait(Trait, StartLoc, LhsT, RhsT, RParenLoc);
   }
 
+  /// \brief Build a new type trait expression.
+  ///
+  /// By default, performs semantic analysis to build the new expression.
+  /// Subclasses may override this routine to provide different behavior.
+  ExprResult RebuildTypeTrait(TypeTrait Trait,
+                              SourceLocation StartLoc,
+                              ArrayRef<TypeSourceInfo *> Args,
+                              SourceLocation RParenLoc) {
+    return getSema().BuildTypeTrait(Trait, StartLoc, Args, RParenLoc);
+  }
+  
   /// \brief Build a new array type trait expression.
   ///
   /// By default, performs semantic analysis to build the new expression.
@@ -7436,6 +7447,128 @@ TreeTransform<Derived>::TransformBinaryTypeTraitExpr(BinaryTypeTraitExpr *E) {
 
 template<typename Derived>
 ExprResult
+TreeTransform<Derived>::TransformTypeTraitExpr(TypeTraitExpr *E) {
+  bool ArgChanged = false;
+  llvm::SmallVector<TypeSourceInfo *, 4> Args;
+  for (unsigned I = 0, N = E->getNumArgs(); I != N; ++I) {
+    TypeSourceInfo *From = E->getArg(I);
+    TypeLoc FromTL = From->getTypeLoc();
+    if (!isa<PackExpansionTypeLoc>(FromTL)) {
+      TypeLocBuilder TLB;
+      TLB.reserve(FromTL.getFullDataSize());
+      QualType To = getDerived().TransformType(TLB, FromTL);
+      if (To.isNull())
+        return ExprError();
+      
+      if (To == From->getType())
+        Args.push_back(From);
+      else {
+        Args.push_back(TLB.getTypeSourceInfo(SemaRef.Context, To));
+        ArgChanged = true;
+      }
+      continue;
+    }
+    
+    ArgChanged = true;
+    
+    // We have a pack expansion. Instantiate it.
+    PackExpansionTypeLoc ExpansionTL = cast<PackExpansionTypeLoc>(FromTL);      
+    TypeLoc PatternTL = ExpansionTL.getPatternLoc();
+    SmallVector<UnexpandedParameterPack, 2> Unexpanded;
+    SemaRef.collectUnexpandedParameterPacks(PatternTL, Unexpanded);
+    
+    // Determine whether the set of unexpanded parameter packs can and should
+    // be expanded.
+    bool Expand = true;
+    bool RetainExpansion = false;
+    llvm::Optional<unsigned> OrigNumExpansions
+      = ExpansionTL.getTypePtr()->getNumExpansions();
+    llvm::Optional<unsigned> NumExpansions = OrigNumExpansions;
+    if (getDerived().TryExpandParameterPacks(ExpansionTL.getEllipsisLoc(),
+                                             PatternTL.getSourceRange(),
+                                             Unexpanded,
+                                             Expand, RetainExpansion,
+                                             NumExpansions))
+      return ExprError();
+    
+    if (!Expand) {
+      // The transform has determined that we should perform a simple
+      // transformation on the pack expansion, producing another pack 
+      // expansion.
+      Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(getSema(), -1);
+      
+      TypeLocBuilder TLB;
+      TLB.reserve(From->getTypeLoc().getFullDataSize());
+
+      QualType To = getDerived().TransformType(TLB, PatternTL);
+      if (To.isNull())
+        return ExprError();
+
+      To = getDerived().RebuildPackExpansionType(To, 
+                                                 PatternTL.getSourceRange(),
+                                                 ExpansionTL.getEllipsisLoc(),
+                                                 NumExpansions);
+      if (To.isNull())
+        return ExprError();
+      
+      PackExpansionTypeLoc ToExpansionTL
+        = TLB.push<PackExpansionTypeLoc>(To);
+      ToExpansionTL.setEllipsisLoc(ExpansionTL.getEllipsisLoc());
+      Args.push_back(TLB.getTypeSourceInfo(SemaRef.Context, To));
+      continue;
+    }
+
+    // Expand the pack expansion by substituting for each argument in the
+    // pack(s).
+    for (unsigned I = 0; I != *NumExpansions; ++I) {
+      Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, I);
+      TypeLocBuilder TLB;
+      TLB.reserve(PatternTL.getFullDataSize());
+      QualType To = getDerived().TransformType(TLB, PatternTL);
+      if (To.isNull())
+        return ExprError();
+
+      Args.push_back(TLB.getTypeSourceInfo(SemaRef.Context, To));
+    }
+    
+    if (!RetainExpansion)
+      continue;
+    
+    // If we're supposed to retain a pack expansion, do so by temporarily
+    // forgetting the partially-substituted parameter pack.
+    ForgetPartiallySubstitutedPackRAII Forget(getDerived());
+
+    TypeLocBuilder TLB;
+    TLB.reserve(From->getTypeLoc().getFullDataSize());
+    
+    QualType To = getDerived().TransformType(TLB, PatternTL);
+    if (To.isNull())
+      return ExprError();
+    
+    To = getDerived().RebuildPackExpansionType(To, 
+                                               PatternTL.getSourceRange(),
+                                               ExpansionTL.getEllipsisLoc(),
+                                               NumExpansions);
+    if (To.isNull())
+      return ExprError();
+    
+    PackExpansionTypeLoc ToExpansionTL
+      = TLB.push<PackExpansionTypeLoc>(To);
+    ToExpansionTL.setEllipsisLoc(ExpansionTL.getEllipsisLoc());
+    Args.push_back(TLB.getTypeSourceInfo(SemaRef.Context, To));
+  }
+  
+  if (!getDerived().AlwaysRebuild() && !ArgChanged)
+    return SemaRef.Owned(E);
+
+  return getDerived().RebuildTypeTrait(E->getTrait(),
+                                       E->getLocStart(),
+                                       Args,
+                                       E->getLocEnd());
+}
+
+template<typename Derived>
+ExprResult
 TreeTransform<Derived>::TransformArrayTypeTraitExpr(ArrayTypeTraitExpr *E) {
   TypeSourceInfo *T = getDerived().TransformType(E->getQueriedTypeSourceInfo());
   if (!T)
diff --git a/lib/Serialization/ASTReaderStmt.cpp b/lib/Serialization/ASTReaderStmt.cpp
index 77e4541669..2d308fb030 100644
--- a/lib/Serialization/ASTReaderStmt.cpp
+++ b/lib/Serialization/ASTReaderStmt.cpp
@@ -1327,6 +1327,17 @@ void ASTStmtReader::VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *E) {
   E->RhsType = GetTypeSourceInfo(Record, Idx);
 }
 
+void ASTStmtReader::VisitTypeTraitExpr(TypeTraitExpr *E) {
+  VisitExpr(E);
+  E->TypeTraitExprBits.NumArgs = Record[Idx++];
+  E->TypeTraitExprBits.Kind = Record[Idx++];
+  E->TypeTraitExprBits.Value = Record[Idx++];
+  
+  TypeSourceInfo **Args = E->getTypeSourceInfos();
+  for (unsigned I = 0, N = E->getNumArgs(); I != N; ++I)
+    Args[I] = GetTypeSourceInfo(Record, Idx);
+}
+
 void ASTStmtReader::VisitArrayTypeTraitExpr(ArrayTypeTraitExpr *E) {
   VisitExpr(E);
   E->ATT = (ArrayTypeTrait)Record[Idx++];
@@ -2046,6 +2057,11 @@ Stmt *ASTReader::ReadStmtFromStream(ModuleFile &F) {
       S = new (Context) BinaryTypeTraitExpr(Empty);
       break;
 
+    case EXPR_TYPE_TRAIT:
+      S = TypeTraitExpr::CreateDeserialized(Context, 
+            Record[ASTStmtReader::NumExprFields]);
+      break;
+        
     case EXPR_ARRAY_TYPE_TRAIT:
       S = new (Context) ArrayTypeTraitExpr(Empty);
       break;
diff --git a/lib/Serialization/ASTWriterStmt.cpp b/lib/Serialization/ASTWriterStmt.cpp
index 0ba413df72..f9c3c5de43 100644
--- a/lib/Serialization/ASTWriterStmt.cpp
+++ b/lib/Serialization/ASTWriterStmt.cpp
@@ -1341,6 +1341,16 @@ void ASTStmtWriter::VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *E) {
   Code = serialization::EXPR_BINARY_TYPE_TRAIT;
 }
 
+void ASTStmtWriter::VisitTypeTraitExpr(TypeTraitExpr *E) {
+  VisitExpr(E);
+  Record.push_back(E->TypeTraitExprBits.NumArgs);
+  Record.push_back(E->TypeTraitExprBits.Kind); // FIXME: Stable encoding
+  Record.push_back(E->TypeTraitExprBits.Value);
+  for (unsigned I = 0, N = E->getNumArgs(); I != N; ++I)
+    Writer.AddTypeSourceInfo(E->getArg(I), Record);
+  Code = serialization::EXPR_TYPE_TRAIT;
+}
+
 void ASTStmtWriter::VisitArrayTypeTraitExpr(ArrayTypeTraitExpr *E) {
   VisitExpr(E);
   Record.push_back(E->getTrait());
diff --git a/lib/StaticAnalyzer/Core/ExprEngine.cpp b/lib/StaticAnalyzer/Core/ExprEngine.cpp
index 34ad23a429..a61c0272b5 100644
--- a/lib/StaticAnalyzer/Core/ExprEngine.cpp
+++ b/lib/StaticAnalyzer/Core/ExprEngine.cpp
@@ -478,6 +478,7 @@ void ExprEngine::Visit(const Stmt *S, ExplodedNode *Pred,
     case Stmt::DependentScopeDeclRefExprClass:
     case Stmt::UnaryTypeTraitExprClass:
     case Stmt::BinaryTypeTraitExprClass:
+    case Stmt::TypeTraitExprClass:
     case Stmt::ArrayTypeTraitExprClass:
     case Stmt::ExpressionTraitExprClass:
     case Stmt::UnresolvedLookupExprClass:
diff --git a/test/Index/annotate-tokens-cxx0x.cpp b/test/Index/annotate-tokens-cxx0x.cpp
index 89876b28ea..a126b85127 100644
--- a/test/Index/annotate-tokens-cxx0x.cpp
+++ b/test/Index/annotate-tokens-cxx0x.cpp
@@ -6,6 +6,11 @@ int f(Args ...args) {
 void test() {
   int a;
   decltype(a) b;
+
+  typedef int Integer;
+  typedef float Float;
+  typedef bool Bool;
+  bool b2 = __is_trivially_constructible(Integer, Float, Bool);
 }
 
 // RUN: c-index-test -test-annotate-tokens=%s:1:1:5:1 -fno-delayed-template-parsing -std=c++11 %s | FileCheck %s
@@ -14,3 +19,9 @@ void test() {
 
 // RUN: c-index-test -test-annotate-tokens=%s:8:1:9:1 -std=c++11 %s | FileCheck -check-prefix=CHECK-DECLTYPE %s
 // CHECK-DECLTYPE: Identifier: "a" [8:12 - 8:13] DeclRefExpr=a:7:7
+
+// RUN: c-index-test -test-annotate-tokens=%s:13:1:14:1 -std=c++11 %s | FileCheck -check-prefix=CHECK-TRAIT %s
+// CHECK-TRAIT: Identifier: "Integer" [13:42 - 13:49] TypeRef=Integer:10:15
+// CHECK-TRAIT: Identifier: "Float" [13:51 - 13:56] TypeRef=Float:11:17
+// CHECK-TRAIT: Identifier: "Bool" [13:58 - 13:62] TypeRef=Bool:12:16
+
diff --git a/test/PCH/cxx-traits.cpp b/test/PCH/cxx-traits.cpp
index 69c64758ae..3df34794f2 100644
--- a/test/PCH/cxx-traits.cpp
+++ b/test/PCH/cxx-traits.cpp
@@ -1,8 +1,11 @@
 // Test this without pch.
-// RUN: %clang_cc1 -include %S/cxx-traits.h -fsyntax-only -verify %s
+// RUN: %clang_cc1 -include %S/cxx-traits.h -std=c++11 -fsyntax-only -verify %s
 
-// RUN: %clang_cc1 -x c++-header -emit-pch -o %t %S/cxx-traits.h
-// RUN: %clang_cc1 -include-pch %t -fsyntax-only -verify %s
+// RUN: %clang_cc1 -x c++-header -std=c++11 -emit-pch -o %t %S/cxx-traits.h
+// RUN: %clang_cc1 -std=c++11 -include-pch %t -fsyntax-only -verify %s
 
 bool _Is_pod_comparator = __is_pod<int>::__value;
 bool _Is_empty_check = __is_empty<int>::__value;
+
+bool default_construct_int = is_trivially_constructible<int>::value;
+bool copy_construct_int = is_trivially_constructible<int, const int&>::value;
diff --git a/test/PCH/cxx-traits.h b/test/PCH/cxx-traits.h
index 62722ab179..8b62002789 100644
--- a/test/PCH/cxx-traits.h
+++ b/test/PCH/cxx-traits.h
@@ -9,3 +9,8 @@ template<typename _Tp>
 struct __is_empty {
   enum { __value };
 };
+
+template<typename T, typename ...Args>
+struct is_trivially_constructible {
+  static const bool value = __is_trivially_constructible(T, Args...);
+};
diff --git a/test/SemaCXX/type-traits.cpp b/test/SemaCXX/type-traits.cpp
index 50c135d0b7..fd41c17ab2 100644
--- a/test/SemaCXX/type-traits.cpp
+++ b/test/SemaCXX/type-traits.cpp
@@ -47,6 +47,10 @@ struct TrivialMoveButNotCopy {
   TrivialMoveButNotCopy &operator=(TrivialMoveButNotCopy&&) = default;
   TrivialMoveButNotCopy &operator=(const TrivialMoveButNotCopy&);
 };
+struct NonTrivialDefault {
+  NonTrivialDefault();
+};
+
 struct HasDest { ~HasDest(); };
 class  HasPriv { int priv; };
 class  HasProt { protected: int prot; };
@@ -104,6 +108,10 @@ class AllPrivate {
   ~AllPrivate() throw();
 };
 
+struct ThreeArgCtor {
+  ThreeArgCtor(int*, char*, int);
+};
+
 void is_pod()
 {
   { int arr[T(__is_pod(int))]; }
@@ -1602,7 +1610,7 @@ void is_trivial()
   { int arr[F(__is_trivial(cvoid))]; }
 }
 
-void is_trivially_copyable()
+void trivial_checks()
 {
   { int arr[T(__is_trivially_copyable(int))]; }
   { int arr[T(__is_trivially_copyable(Enum))]; }
@@ -1646,6 +1654,25 @@ void is_trivially_copyable()
   { int arr[F(__is_trivially_copyable(void))]; }
   { int arr[F(__is_trivially_copyable(cvoid))]; }
 
+  { int arr[T((__is_trivially_constructible(int)))]; }
+  { int arr[T((__is_trivially_constructible(int, int)))]; }
+  { int arr[T((__is_trivially_constructible(int, float)))]; }
+  { int arr[T((__is_trivially_constructible(int, int&)))]; }
+  { int arr[T((__is_trivially_constructible(int, const int&)))]; }
+  { int arr[T((__is_trivially_constructible(int, int)))]; }
+  { int arr[T((__is_trivially_constructible(HasCopyAssign, HasCopyAssign)))]; }
+  { int arr[T((__is_trivially_constructible(HasCopyAssign, const HasCopyAssign&)))]; }
+  { int arr[T((__is_trivially_constructible(HasCopyAssign, HasCopyAssign&&)))]; }
+  { int arr[T((__is_trivially_constructible(HasCopyAssign)))]; }
+  { int arr[T((__is_trivially_constructible(NonTrivialDefault,
+                                            const NonTrivialDefault&)))]; }
+  { int arr[T((__is_trivially_constructible(NonTrivialDefault,
+                                            NonTrivialDefault&&)))]; }
+
+  { int arr[F((__is_trivially_constructible(int, int*)))]; }
+  { int arr[F((__is_trivially_constructible(NonTrivialDefault)))]; }
+  { int arr[F((__is_trivially_constructible(ThreeArgCtor, int*, char*, int&)))]; }
+
   { int arr[T((__is_trivially_assignable(int&, int)))]; }
   { int arr[T((__is_trivially_assignable(int&, int&)))]; }
   { int arr[T((__is_trivially_assignable(int&, int&&)))]; }
@@ -1680,6 +1707,33 @@ void is_trivially_copyable()
                                          TrivialMoveButNotCopy&&)))]; }
 }
 
+// Instantiation of __is_trivially_constructible
+template<typename T, typename ...Args>
+struct is_trivially_constructible {
+  static const bool value = __is_trivially_constructible(T, Args...);
+};
+
+void is_trivially_constructible_test() {
+  { int arr[T((is_trivially_constructible<int>::value))]; }
+  { int arr[T((is_trivially_constructible<int, int>::value))]; }
+  { int arr[T((is_trivially_constructible<int, float>::value))]; }
+  { int arr[T((is_trivially_constructible<int, int&>::value))]; }
+  { int arr[T((is_trivially_constructible<int, const int&>::value))]; }
+  { int arr[T((is_trivially_constructible<int, int>::value))]; }
+  { int arr[T((is_trivially_constructible<HasCopyAssign, HasCopyAssign>::value))]; }
+  { int arr[T((is_trivially_constructible<HasCopyAssign, const HasCopyAssign&>::value))]; }
+  { int arr[T((is_trivially_constructible<HasCopyAssign, HasCopyAssign&&>::value))]; }
+  { int arr[T((is_trivially_constructible<HasCopyAssign>::value))]; }
+  { int arr[T((is_trivially_constructible<NonTrivialDefault,
+                                            const NonTrivialDefault&>::value))]; }
+  { int arr[T((is_trivially_constructible<NonTrivialDefault,
+                                            NonTrivialDefault&&>::value))]; }
+
+  { int arr[F((is_trivially_constructible<int, int*>::value))]; }
+  { int arr[F((is_trivially_constructible<NonTrivialDefault>::value))]; }
+  { int arr[F((is_trivially_constructible<ThreeArgCtor, int*, char*, int&>::value))]; }
+}
+
 void array_rank() {
   int t01[T(__array_rank(IntAr) == 1)];
   int t02[T(__array_rank(ConstIntArAr) == 2)];
diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index 8d0f5fa76f..53c7634d46 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -1755,6 +1755,7 @@ public:
   void VisitWhileStmt(WhileStmt *W);
   void VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E);
   void VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *E);
+  void VisitTypeTraitExpr(TypeTraitExpr *E);
   void VisitArrayTypeTraitExpr(ArrayTypeTraitExpr *E);
   void VisitExpressionTraitExpr(ExpressionTraitExpr *E);
   void VisitUnresolvedMemberExpr(UnresolvedMemberExpr *U);
@@ -2056,6 +2057,11 @@ void EnqueueVisitor::VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *E) {
   AddTypeLoc(E->getLhsTypeSourceInfo());
 }
 
+void EnqueueVisitor::VisitTypeTraitExpr(TypeTraitExpr *E) {
+  for (unsigned I = E->getNumArgs(); I > 0; --I)
+    AddTypeLoc(E->getArg(I-1));
+}
+
 void EnqueueVisitor::VisitArrayTypeTraitExpr(ArrayTypeTraitExpr *E) {
   AddTypeLoc(E->getQueriedTypeSourceInfo());
 }
diff --git a/tools/libclang/CXCursor.cpp b/tools/libclang/CXCursor.cpp
index 531e70e17a..1adf552683 100644
--- a/tools/libclang/CXCursor.cpp
+++ b/tools/libclang/CXCursor.cpp
@@ -206,6 +206,7 @@ CXCursor cxcursor::MakeCXCursor(Stmt *S, Decl *Parent, CXTranslationUnit TU,
   case Stmt::AtomicExprClass:
   case Stmt::BinaryConditionalOperatorClass:
   case Stmt::BinaryTypeTraitExprClass:
+  case Stmt::TypeTraitExprClass:
   case Stmt::CXXBindTemporaryExprClass:
   case Stmt::CXXDefaultArgExprClass:
   case Stmt::CXXScalarValueInitExprClass: