8 files changed, 792 insertions, 0 deletions
diff --git a/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p1.cpp b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p1.cpp
new file mode 100644
index 0000000..6820fc6
--- /dev/null
+++ b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p1.cpp
@@ -0,0 +1,123 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
+
+struct notlit { // expected-note {{not literal because}}
+  notlit() {}
+};
+struct notlit2 {
+  notlit2() {}
+};
+
+// valid declarations
+constexpr int i1 = 0;
+constexpr int f1() { return 0; }
+struct s1 {
+  constexpr static int mi1 = 0;
+  const static int mi2;
+};
+constexpr int s1::mi2 = 0;
+
+// invalid declarations
+// not a definition of an object
+constexpr extern int i2; // expected-error {{constexpr variable declaration must be a definition}}
+// not a literal type
+constexpr notlit nl1; // expected-error {{constexpr variable cannot have non-literal type 'const notlit'}}
+// function parameters
+void f2(constexpr int i) {} // expected-error {{function parameter cannot be constexpr}}
+// non-static member
+struct s2 {
+  constexpr int mi1; // expected-error {{non-static data member cannot be constexpr}}
+  static constexpr int mi2; // expected-error {{requires an initializer}}
+};
+// typedef
+typedef constexpr int CI; // expected-error {{typedef cannot be constexpr}}
+// tag
+constexpr class C1 {}; // expected-error {{class cannot be marked constexpr}}
+constexpr struct S1 {}; // expected-error {{struct cannot be marked constexpr}}
+constexpr union U1 {}; // expected-error {{union cannot be marked constexpr}}
+constexpr enum E1 {}; // expected-error {{enum cannot be marked constexpr}}
+template <typename T> constexpr class TC1 {}; // expected-error {{class cannot be marked constexpr}}
+template <typename T> constexpr struct TS1 {}; // expected-error {{struct cannot be marked constexpr}}
+template <typename T> constexpr union TU1 {}; // expected-error {{union cannot be marked constexpr}}
+class C2 {} constexpr; // expected-error {{class cannot be marked constexpr}}
+struct S2 {} constexpr; // expected-error {{struct cannot be marked constexpr}}
+union U2 {} constexpr; // expected-error {{union cannot be marked constexpr}}
+enum E2 {} constexpr; // expected-error {{enum cannot be marked constexpr}}
+constexpr class C3 {} c3 = C3();
+constexpr struct S3 {} s3 = S3();
+constexpr union U3 {} u3 = {};
+constexpr enum E3 { V3 } e3 = V3;
+class C4 {} constexpr c4 = C4();
+struct S4 {} constexpr s4 = S4();
+union U4 {} constexpr u4 = {};
+enum E4 { V4 } constexpr e4 = V4;
+constexpr int; // expected-error {{constexpr can only be used in variable and function declarations}}
+// redeclaration mismatch
+constexpr int f3(); // expected-note {{previous declaration is here}}
+int f3(); // expected-error {{non-constexpr declaration of 'f3' follows constexpr declaration}}
+int f4(); // expected-note {{previous declaration is here}}
+constexpr int f4(); // expected-error {{constexpr declaration of 'f4' follows non-constexpr declaration}}
+template<typename T> constexpr T f5(T);
+template<typename T> constexpr T f5(T); // expected-note {{previous}}
+template<typename T> T f5(T); // expected-error {{non-constexpr declaration of 'f5' follows constexpr declaration}}
+template<typename T> T f6(T); // expected-note {{here}}
+template<typename T> constexpr T f6(T); // expected-error {{constexpr declaration of 'f6' follows non-constexpr declaration}}
+// destructor
+struct ConstexprDtor {
+  constexpr ~ConstexprDtor() = default; // expected-error {{destructor cannot be marked constexpr}}
+};
+
+// template stuff
+template <typename T> constexpr T ft(T t) { return t; }
+template <typename T> T gt(T t) { return t; }
+struct S {
+  template<typename T> constexpr T f();
+  template<typename T> T g() const;
+};
+
+// explicit specialization can differ in constepxr
+template <> notlit ft(notlit nl) { return nl; }
+template <> char ft(char c) { return c; } // expected-note {{previous}}
+template <> constexpr char ft(char nl); // expected-error {{constexpr declaration of 'ft<char>' follows non-constexpr declaration}}
+template <> constexpr int gt(int nl) { return nl; }
+template <> notlit S::f() const { return notlit(); }
+template <> constexpr int S::g() { return 0; } // expected-note {{previous}}
+template <> int S::g() const; // expected-error {{non-constexpr declaration of 'g<int>' follows constexpr declaration}}
+// specializations can drop the 'constexpr' but not the implied 'const'.
+template <> char S::g() { return 0; } // expected-error {{no function template matches}}
+template <> double S::g() const { return 0; } // ok
+
+constexpr int i3 = ft(1);
+
+void test() {
+  // ignore constexpr when instantiating with non-literal
+  notlit2 nl2;
+  (void)ft(nl2);
+}
+
+// Examples from the standard:
+constexpr int square(int x); // expected-note {{declared here}}
+constexpr int bufsz = 1024;
+
+constexpr struct pixel { // expected-error {{struct cannot be marked constexpr}}
+  int x;
+  int y;
+  constexpr pixel(int);
+};
+
+constexpr pixel::pixel(int a)
+  : x(square(a)), y(square(a)) // expected-note {{undefined function 'square' cannot be used in a constant expression}}
+  { }
+
+constexpr pixel small(2); // expected-error {{must be initialized by a constant expression}} expected-note {{in call to 'pixel(2)'}}
+
+constexpr int square(int x) {
+  return x * x;
+}
+
+constexpr pixel large(4);
+
+int next(constexpr int x) { // expected-error {{function parameter cannot be constexpr}}
+      return x + 1;
+}
+
+extern constexpr int memsz; // expected-error {{constexpr variable declaration must be a definition}}
diff --git a/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p2.cpp b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p2.cpp
new file mode 100644
index 0000000..001a086
--- /dev/null
+++ b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p2.cpp
@@ -0,0 +1,26 @@
+// RUN: %clang_cc1 -std=c++11 -emit-llvm %s -o - | FileCheck %s
+
+// constexpr functions and constexpr constructors are implicitly inline.
+struct S {
+  constexpr S(int n);
+  constexpr int g();
+  int n;
+};
+
+constexpr S::S(int n) : n(n) {}
+
+constexpr S f(S s) {
+  return s.n * 2;
+}
+
+constexpr int S::g() {
+  return f(*this).n;
+}
+
+// CHECK: define linkonce_odr {{.*}} @_Z1f1S(
+// CHECK: define linkonce_odr {{.*}} @_ZN1SC1Ei(
+// CHECK: define linkonce_odr {{.*}} @_ZNK1S1gEv(
+
+int g() {
+  return f(42).g();
+}
diff --git a/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p3.cpp b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p3.cpp
new file mode 100644
index 0000000..cafdd63
--- /dev/null
+++ b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p3.cpp
@@ -0,0 +1,139 @@
+// RUN: %clang_cc1 -verify -std=c++11 %s
+
+namespace N {
+  typedef char C;
+}
+
+namespace M {
+  typedef double D;
+}
+
+struct NonLiteral { // expected-note 2{{no constexpr constructors}}
+  NonLiteral() {}
+  NonLiteral(int) {}
+};
+struct Literal {
+  constexpr Literal() {}
+  operator int() const { return 0; }
+};
+
+struct S {
+  virtual int ImplicitlyVirtual() const = 0; // expected-note {{overridden virtual function}}
+};
+struct SS : S { 
+  int ImplicitlyVirtual() const;
+};
+
+// The definition of a constexpr function shall satisfy the following
+// constraints:
+struct T : SS, NonLiteral { // expected-note {{base class 'NonLiteral' of non-literal type}}
+  constexpr T();
+  constexpr int f(); // expected-error {{non-literal type 'T' cannot have constexpr members}}
+
+  //  - it shall not be virtual;
+  virtual constexpr int ExplicitlyVirtual() { return 0; } // expected-error {{virtual function cannot be constexpr}}
+
+  constexpr int ImplicitlyVirtual() { return 0; } // expected-error {{virtual function cannot be constexpr}}
+
+  //  - its return type shall be a literal type;
+  constexpr NonLiteral NonLiteralReturn() { return {}; } // expected-error {{constexpr function's return type 'NonLiteral' is not a literal type}}
+  constexpr void VoidReturn() { return; } // expected-error {{constexpr function's return type 'void' is not a literal type}}
+  constexpr ~T(); // expected-error {{destructor cannot be marked constexpr}}
+  typedef NonLiteral F();
+  constexpr F NonLiteralReturn2; // ok until definition
+
+  //  - each of its parameter types shall be a literal type;
+  constexpr int NonLiteralParam(NonLiteral) { return 0; } // expected-error {{constexpr function's 1st parameter type 'NonLiteral' is not a literal type}}
+  typedef int G(NonLiteral);
+  constexpr G NonLiteralParam2; // ok until definition
+
+  //  - its function-body shall be = delete, = default,
+  constexpr int Deleted() = delete;
+  // It's not possible for the function-body to legally be "= default" here.
+  // Other than constructors, only the copy- and move-assignment operators and
+  // destructor can be defaulted. Destructors can't be constexpr since they
+  // don't have a literal return type. Defaulted assignment operators can't be
+  // constexpr since they can't be const.
+  constexpr T &operator=(const T&) = default; // expected-error {{an explicitly-defaulted copy assignment operator may not have 'const', 'constexpr' or 'volatile' qualifiers}}
+};
+struct U {
+  constexpr U SelfReturn();
+  constexpr int SelfParam(U);
+};
+
+struct V : virtual U { // expected-note {{here}}
+  constexpr int F() { return 0; } // expected-error {{constexpr member function not allowed in struct with virtual base class}}
+};
+
+//  or a compound-statememt that contains only
+constexpr int AllowedStmts() {
+  //  - null statements
+  ;
+
+  //  - static_assert-declarations
+  static_assert(true, "the impossible happened!");
+
+  //  - typedef declarations and alias-declarations that do not define classes
+  //    or enumerations
+  typedef int I;
+  typedef struct S T;
+  using J = int;
+  using K = int[sizeof(I) + sizeof(J)];
+  // Note, the standard requires we reject this.
+  struct U;
+
+  //  - using-declarations
+  using N::C;
+
+  //  - using-directives
+  using namespace N;
+
+  //  - and exactly one return statement
+  return sizeof(K) + sizeof(C) + sizeof(K);
+}
+constexpr int ForStmt() {
+  for (int n = 0; n < 10; ++n) // expected-error {{statement not allowed in constexpr function}}
+    return 0;
+}
+constexpr int VarDecl() {
+  constexpr int a = 0; // expected-error {{variables cannot be declared in a constexpr function}}
+  return 0;
+}
+constexpr int FuncDecl() {
+  constexpr int ForwardDecl(int); // expected-error {{statement not allowed in constexpr function}}
+  return ForwardDecl(42);
+}
+constexpr int ClassDecl1() {
+  typedef struct { } S1; // expected-error {{types cannot be defined in a constexpr function}}
+  return 0;
+}
+constexpr int ClassDecl2() {
+  using S2 = struct { }; // expected-error {{types cannot be defined in a constexpr function}}
+  return 0;
+}
+constexpr int ClassDecl3() {
+  struct S3 { }; // expected-error {{types cannot be defined in a constexpr function}}
+  return 0;
+}
+constexpr int NoReturn() {} // expected-error {{no return statement in constexpr function}}
+constexpr int MultiReturn() {
+  return 0; // expected-note {{return statement}}
+  return 0; // expected-error {{multiple return statements in constexpr function}}
+}
+
+//  - every constructor call and implicit conversion used in initializing the
+//    return value shall be one of those allowed in a constant expression.
+//
+// We implement the proposed resolution of DR1364 and ignore this bullet.
+// However, we implement the spirit of the check as part of the p5 checking that
+// a constexpr function must be able to produce a constant expression.
+namespace DR1364 {
+  constexpr int f(int k) {
+    return k; // ok, even though lvalue-to-rvalue conversion of a function
+              // parameter is not allowed in a constant expression.
+  }
+  int kGlobal; // expected-note {{here}}
+  constexpr int f() { // expected-error {{constexpr function never produces a constant expression}}
+    return kGlobal; // expected-note {{read of non-const}}
+  }
+}
diff --git a/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p4.cpp b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p4.cpp
new file mode 100644
index 0000000..65573c7
--- /dev/null
+++ b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p4.cpp
@@ -0,0 +1,249 @@
+// RUN: %clang_cc1 -verify -std=c++11 -fcxx-exceptions %s
+
+namespace N {
+  typedef char C;
+}
+
+namespace M {
+  typedef double D;
+}
+
+struct NonLiteral { // expected-note 2{{no constexpr constructors}}
+  NonLiteral() {}
+  NonLiteral(int) {}
+};
+struct Literal {
+  constexpr Literal() {}
+  explicit Literal(int); // expected-note 2 {{here}}
+  operator int() const { return 0; }
+};
+
+// In the definition of a constexpr constructor, each of the parameter types
+// shall be a literal type.
+struct S {
+  constexpr S(int, N::C) {}
+  constexpr S(int, NonLiteral, N::C) {} // expected-error {{constexpr constructor's 2nd parameter type 'NonLiteral' is not a literal type}}
+  constexpr S(int, NonLiteral = 42) {} // expected-error {{constexpr constructor's 2nd parameter type 'NonLiteral' is not a literal type}}
+
+  // In addition, either its function-body shall be = delete or = default
+  constexpr S() = default;
+  constexpr S(Literal) = delete;
+};
+
+// or it shall satisfy the following constraints:
+
+// - the class shall not have any virtual base classes;
+struct T : virtual S { // expected-note {{here}}
+  constexpr T() {} // expected-error {{constexpr constructor not allowed in struct with virtual base class}}
+};
+namespace IndirectVBase {
+  struct A {};
+  struct B : virtual A {}; // expected-note {{here}}
+  class C : public B {
+  public:
+    constexpr C() {} // expected-error {{constexpr constructor not allowed in class with virtual base class}}
+  };
+}
+
+// - its function-body shall not be a function-try-block;
+struct U {
+  constexpr U()
+    try // expected-error {{function try block not allowed in constexpr constructor}}
+    : u() {
+  } catch (...) {
+    throw;
+  }
+  int u;
+};
+
+// - the compound-statememt of its function-body shall contain only
+struct V {
+  constexpr V() {
+    //  - null statements,
+    ;
+
+    //  - static_assert-declarations,
+    static_assert(true, "the impossible happened!");
+
+    //  - typedef declarations and alias-declarations that do not define classes
+    //    or enumerations,
+    typedef int I;
+    typedef struct S T;
+    using J = int;
+    using K = int[sizeof(I) + sizeof(J)];
+    // Note, the standard requires we reject this.
+    struct U;
+
+    //  - using-declarations,
+    using N::C;
+
+    //  - and using-directives;
+    using namespace N;
+  }
+
+  constexpr V(int(&)[1]) {
+    for (int n = 0; n < 10; ++n) // expected-error {{statement not allowed in constexpr constructor}}
+      /**/;
+  }
+  constexpr V(int(&)[2]) {
+    constexpr int a = 0; // expected-error {{variables cannot be declared in a constexpr constructor}}
+  }
+  constexpr V(int(&)[3]) {
+    constexpr int ForwardDecl(int); // expected-error {{statement not allowed in constexpr constructor}}
+  }
+  constexpr V(int(&)[4]) {
+    typedef struct { } S1; // expected-error {{types cannot be defined in a constexpr constructor}}
+  }
+  constexpr V(int(&)[5]) {
+    using S2 = struct { }; // expected-error {{types cannot be defined in a constexpr constructor}}
+  }
+  constexpr V(int(&)[6]) {
+    struct S3 { }; // expected-error {{types cannot be defined in a constexpr constructor}}
+  }
+  constexpr V(int(&)[7]) {
+    return; // expected-error {{statement not allowed in constexpr constructor}}
+  }
+};
+
+// - every non-static data member and base class sub-object shall be initialized
+struct W {
+  int n; // expected-note {{member not initialized by constructor}}
+  constexpr W() {} // expected-error {{constexpr constructor must initialize all members}}
+};
+struct AnonMembers {
+  int a; // expected-note {{member not initialized by constructor}}
+  union { // expected-note 2{{member not initialized by constructor}}
+    char b;
+    struct {
+      double c;
+      long d; // expected-note {{member not initialized by constructor}}
+    };
+    union {
+      char e;
+      void *f;
+    };
+  };
+  struct { // expected-note {{member not initialized by constructor}}
+    long long g;
+    struct {
+      int h; // expected-note {{member not initialized by constructor}}
+      double i; // expected-note {{member not initialized by constructor}}
+    };
+    union { // expected-note 2{{member not initialized by constructor}}
+      char *j;
+      AnonMembers *k;
+    };
+  };
+
+  constexpr AnonMembers(int(&)[1]) : a(), b(), g(), h(), i(), j() {} // ok
+  // missing d, i, j/k union
+  constexpr AnonMembers(int(&)[2]) : a(), c(), g(), h() {} // expected-error {{constexpr constructor must initialize all members}}
+  constexpr AnonMembers(int(&)[3]) : a(), e(), g(), h(), i(), k() {} // ok
+  // missing h, j/k union
+  constexpr AnonMembers(int(&)[4]) : a(), c(), d(), g(), i() {} // expected-error {{constexpr constructor must initialize all members}}
+  // missing b/c/d/e/f union
+  constexpr AnonMembers(int(&)[5]) : a(), g(), h(), i(), k() {} // expected-error {{constexpr constructor must initialize all members}}
+  // missing a, b/c/d/e/f union, g/h/i/j/k struct
+  constexpr AnonMembers(int(&)[6]) {} // expected-error {{constexpr constructor must initialize all members}}
+};
+
+union Empty {
+  constexpr Empty() {} // ok
+} constexpr empty1;
+
+struct EmptyVariant {
+  union {};
+  struct {};
+  constexpr EmptyVariant() {} // ok
+} constexpr empty2;
+
+template<typename T> using Int = int;
+template<typename T>
+struct TemplateInit {
+  T a;
+  int b; // desired-note {{not initialized}}
+  Int<T> c; // desired-note {{not initialized}}
+  struct {
+    T d;
+    int e; // desired-note {{not initialized}}
+    Int<T> f; // desired-note {{not initialized}}
+  };
+  struct {
+    Literal l;
+    Literal m;
+    Literal n[3];
+  };
+  union { // desired-note {{not initialized}}
+    T g;
+    T h;
+  };
+  // FIXME: This is ill-formed (no diagnostic required). We should diagnose it.
+  constexpr TemplateInit() {} // desired-error {{must initialize all members}}
+};
+template<typename T> struct TemplateInit2 {
+  Literal l;
+  constexpr TemplateInit2() {} // ok
+};
+
+template<typename T> struct weak_ptr {
+  constexpr weak_ptr() : p(0) {}
+  T *p;
+};
+template<typename T> struct enable_shared_from_this {
+  weak_ptr<T> weak_this;
+  constexpr enable_shared_from_this() {} // ok
+};
+constexpr int f(enable_shared_from_this<int>);
+
+// - every constructor involved in initializing non-static data members and base
+//   class sub-objects shall be a constexpr constructor.
+struct ConstexprBaseMemberCtors : Literal {
+  Literal l;
+
+  constexpr ConstexprBaseMemberCtors() : Literal(), l() {} // ok
+  constexpr ConstexprBaseMemberCtors(char) : // expected-error {{constexpr constructor never produces a constant expression}}
+    Literal(0), // expected-note {{non-constexpr constructor}}
+    l() {}
+  constexpr ConstexprBaseMemberCtors(double) : Literal(), // expected-error {{constexpr constructor never produces a constant expression}}
+    l(0) // expected-note {{non-constexpr constructor}}
+  {}
+};
+
+// - every assignment-expression that is an initializer-caluse appearing
+//   directly or indirectly within a brace-or-equal-initializer for a non-static
+//   data member that is not named by a mem-initializer-id shall be a constant
+//   expression; and
+//
+// Note, we deliberately do not implement this bullet, so that we can allow the
+// following example. (See N3308).
+struct X {
+  int a = 0;
+  int b = 2 * a + 1; // ok, not a constant expression.
+
+  constexpr X() {}
+  constexpr X(int c) : a(c) {} // ok, b initialized by 2 * c + 1
+};
+
+//  - every implicit conversion used in converting a constructor argument to the
+//    corresponding parameter type and converting a full-expression to the
+//    corresponding member type shall be one of those allowed in a constant
+//    expression.
+//
+// We implement the proposed resolution of DR1364 and ignore this bullet.
+// However, we implement the intent of this wording as part of the p5 check that
+// the function must be able to produce a constant expression.
+int kGlobal; // expected-note {{here}}
+struct Z {
+  constexpr Z(int a) : n(a) {}
+  constexpr Z() : n(kGlobal) {} // expected-error {{constexpr constructor never produces a constant expression}} expected-note {{read of non-const}}
+  int n;
+};
+
+
+namespace StdExample {
+  struct Length {
+    explicit constexpr Length(int i = 0) : val(i) { }
+  private:
+      int val;
+  };
+}
diff --git a/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p5.cpp b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p5.cpp
new file mode 100644
index 0000000..fd17d35
--- /dev/null
+++ b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p5.cpp
@@ -0,0 +1,112 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -fcxx-exceptions %s
+// RUN: %clang_cc1 -fsyntax-only -std=c++11 -fcxx-exceptions -Wno-invalid-constexpr %s
+
+namespace StdExample {
+
+constexpr int f(void *) { return 0; }
+constexpr int f(...) { return 1; }
+constexpr int g1() { return f(0); }
+constexpr int g2(int n) { return f(n); }
+constexpr int g3(int n) { return f(n*0); }
+
+namespace N {
+  constexpr int c = 5;
+  constexpr int h() { return c; }
+}
+constexpr int c = 0;
+constexpr int g4() { return N::h(); }
+
+static_assert(f(0) == 0, "");
+static_assert(f('0') == 1, "");
+static_assert(g1() == 0, "");
+static_assert(g2(0) == 1, "");
+static_assert(g2(1) == 1, "");
+static_assert(g3(0) == 1, "");
+static_assert(g3(1) == 1, "");
+static_assert(N::h() == 5, "");
+static_assert(g4() == 5, "");
+
+
+constexpr int f(bool b)
+  { return b ? throw 0 : 0; } // ok
+constexpr int f() { return throw 0, 0; } // expected-error {{constexpr function never produces a constant expression}} expected-note {{subexpression}}
+
+struct B {
+  constexpr B(int x) : i(0) { }
+  int i;
+};
+
+int global; // expected-note {{declared here}}
+
+struct D : B {
+  constexpr D() : B(global) { } // expected-error {{constexpr constructor never produces a constant expression}} expected-note {{read of non-const}}
+};
+
+}
+
+namespace PotentialConstant {
+
+constexpr int Comma(int n) { return // expected-error {{constexpr function never produces a constant expression}}
+  (void)(n * 2),
+  throw 0, // expected-note {{subexpression}}
+  0;
+}
+
+int ng; // expected-note 6{{here}}
+constexpr int BinaryOp1(int n) { return n + ng; } // expected-error {{never produces}} expected-note {{read}}
+constexpr int BinaryOp2(int n) { return ng + n; } // expected-error {{never produces}} expected-note {{read}}
+
+double dg; // expected-note 2{{here}}
+constexpr double BinaryOp1(double d) { return d + dg; } // expected-error {{never produces}} expected-note {{read}}
+constexpr double BinaryOp2(double d) { return dg + d; } // expected-error {{never produces}} expected-note {{read}}
+
+constexpr int Add(int a, int b, int c) { return a + b + c; }
+constexpr int FunctionArgs(int a) { return Add(a, ng, a); } // expected-error {{never produces}} expected-note {{read}}
+
+struct S { int a; int b; int c[2]; };
+constexpr S InitList(int a) { return { a, ng }; }; // expected-error {{never produces}} expected-note {{read}}
+constexpr S InitList1a(int a) { return S{ a, ng }; }; // expected-error {{never produces}} expected-note {{read}}
+constexpr S InitList2(int a) { return { a, a, { ng } }; }; // expected-error {{never produces}} expected-note {{read}}
+constexpr S InitList3(int a) { return a ? S{ a, a } : S{ a, ng }; }; // ok
+
+constexpr int LogicalAnd1(int n) { return n && (throw, 0); } // ok
+constexpr int LogicalAnd2(int n) { return 1 && (throw, 0); } // expected-error {{never produces}} expected-note {{subexpression}}
+
+constexpr int LogicalOr1(int n) { return n || (throw, 0); } // ok
+constexpr int LogicalOr2(int n) { return 0 || (throw, 0); } // expected-error {{never produces}} expected-note {{subexpression}}
+
+constexpr int Conditional1(bool b, int n) { return b ? n : ng; } // ok
+constexpr int Conditional2(bool b, int n) { return b ? n * ng : n + ng; } // expected-error {{never produces}} expected-note {{both arms of conditional operator are unable to produce a constant expression}}
+
+// __builtin_constant_p ? : is magical, and is always a potential constant.
+constexpr bool BcpCall(int n) {
+  return __builtin_constant_p((int*)n != &n) ? (int*)n != &n : (int*)n != &n;
+}
+static_assert(BcpCall(0), "");
+
+// DR1311: A function template which can produce a constant expression, but
+// for which a particular specialization cannot, is ok.
+template<typename T> constexpr T cmin(T a, T b) {
+  return a < b ? a : b;
+}
+int n = cmin(3, 5); // ok
+
+struct X {
+  constexpr X() {}
+  bool operator<(X); // not constexpr
+};
+
+X x = cmin(X(), X()); // ok, not constexpr
+
+// Same with other temploids.
+template<typename T>
+struct Y {
+  constexpr Y() {}
+  constexpr int get() { return T(); }
+};
+struct Z { operator int(); };
+
+int y1 = Y<int>().get(); // ok
+int y2 = Y<Z>().get(); // ok
+
+}
diff --git a/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p6.cpp b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p6.cpp
new file mode 100644
index 0000000..1a6dc9e
--- /dev/null
+++ b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p6.cpp
@@ -0,0 +1,68 @@
+// RUN: %clang_cc1 -verify -std=c++11 %s
+
+namespace N {
+  typedef char C;
+}
+
+namespace M {
+  typedef double D;
+}
+
+struct NonLiteral {
+  NonLiteral() {}
+  NonLiteral(int) {} // expected-note 2{{here}}
+  operator int() const { return 0; }
+};
+struct Literal {
+  constexpr Literal() {}
+  operator int() const { return 0; }
+};
+
+struct S {
+  virtual int ImplicitlyVirtual() const;
+};
+struct T {};
+
+template<typename T> struct ImplicitVirtualFromDependentBase : T {
+  constexpr int ImplicitlyVirtual() { return 0; }
+};
+
+constexpr int a = ImplicitVirtualFromDependentBase<S>().ImplicitlyVirtual(); // expected-error {{constant expression}} expected-note {{cannot evaluate virtual function call}}
+constexpr int b = ImplicitVirtualFromDependentBase<T>().ImplicitlyVirtual(); // ok
+constexpr int c = ImplicitVirtualFromDependentBase<S>().ImplicitVirtualFromDependentBase<S>::ImplicitlyVirtual();
+
+template<typename R> struct ConstexprMember {
+  constexpr R F() { return 0; }
+};
+constexpr int d = ConstexprMember<int>().F(); // ok
+constexpr int e = ConstexprMember<NonLiteral>().F(); // expected-error {{constant expression}}
+
+template<typename ...P> struct ConstexprCtor {
+  constexpr ConstexprCtor(P...) {}
+};
+constexpr ConstexprCtor<> f1() { return {}; } // ok
+constexpr ConstexprCtor<int> f2() { return 0; } // ok
+constexpr ConstexprCtor<NonLiteral> f3() { return { 0 }; } // expected-error {{never produces a constant expression}} expected-note {{non-constexpr constructor 'NonLiteral}}
+constexpr ConstexprCtor<int, NonLiteral> f4() { return { 0, 0 }; } // expected-error {{never produces a constant expression}} expected-note {{non-constexpr constructor 'NonLiteral}}
+
+struct VirtBase : virtual S {}; // expected-note {{here}}
+
+namespace TemplateVBase {
+  template<typename T> struct T1 : virtual Literal { // expected-note {{here}}
+    constexpr T1() {} // expected-error {{constexpr constructor not allowed in struct with virtual base class}}
+  };
+
+  template<typename T> struct T2 : virtual T {
+    // FIXME: This is ill-formed (no diagnostic required).
+    // We should diagnose it now rather than waiting until instantiation.
+    constexpr T2() {}
+  };
+  constexpr T2<Literal> g2() { return {}; }
+
+  template<typename T> class T3 : public T { // expected-note {{class with virtual base class is not a literal type}}
+  public:
+    constexpr T3() {}
+  };
+  constexpr T3<Literal> g3() { return {}; } // ok
+  constexpr T3<VirtBase> g4() { return {}; } // expected-error {{not a literal type}}
+}
diff --git a/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p8.cpp b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p8.cpp
new file mode 100644
index 0000000..c4935b3
--- /dev/null
+++ b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p8.cpp
@@ -0,0 +1,38 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
+
+struct S {
+  constexpr int f();
+  constexpr int g() const;
+  static constexpr int Sf();
+};
+
+void f(const S &s) {
+  s.f();
+  s.g();
+
+  int (*f)() = &S::Sf;
+  int (S::*g)() const = &S::g;
+}
+
+namespace std_example {
+
+  class debug_flag { // expected-note {{not an aggregate and has no constexpr constructors}}
+  public:
+    explicit debug_flag(bool);
+    constexpr bool is_on(); // expected-error {{non-literal type 'std_example::debug_flag' cannot have constexpr members}}
+  private:
+    bool flag;
+  };
+
+  constexpr int bar(int x, int y) // expected-note {{here}}
+    { return x + y + x*y; }
+  int bar(int x, int y) // expected-error {{non-constexpr declaration of 'bar' follows constexpr declaration}}
+    { return x * 2 + 3 * y; }
+
+}
+
+// The constexpr specifier is allowed for static member functions of non-literal types.
+class NonLiteralClass {
+  NonLiteralClass(bool);
+  static constexpr bool isDebugFlag();
+};
diff --git a/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p9.cpp b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p9.cpp
new file mode 100644
index 0000000..2412a14
--- /dev/null
+++ b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p9.cpp
@@ -0,0 +1,37 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
+
+// A constexpr specifier used in an object declaration declares the object as
+// const.
+constexpr int a = 0;
+extern const int a;
+
+int i; // expected-note 2{{here}}
+constexpr int *b = &i;
+extern int *const b;
+
+constexpr int &c = i;
+extern int &c;
+
+constexpr int (*d)(int) = 0;
+extern int (*const d)(int);
+
+// A variable declaration which uses the constexpr specifier shall have an
+// initializer and shall be initialized by a constant expression.
+constexpr int ni1; // expected-error {{default initialization of an object of const type 'const int'}}
+constexpr struct C { C(); } ni2; // expected-error {{cannot have non-literal type 'const struct C'}} expected-note 3{{has no constexpr constructors}}
+constexpr double &ni3; // expected-error {{declaration of reference variable 'ni3' requires an initializer}}
+
+constexpr int nc1 = i; // expected-error {{constexpr variable 'nc1' must be initialized by a constant expression}} expected-note {{read of non-const variable 'i' is not allowed in a constant expression}}
+constexpr C nc2 = C(); // expected-error {{cannot have non-literal type 'const C'}}
+int &f(); // expected-note {{declared here}}
+constexpr int &nc3 = f(); // expected-error {{constexpr variable 'nc3' must be initialized by a constant expression}} expected-note {{non-constexpr function 'f' cannot be used in a constant expression}}
+constexpr int nc4(i); // expected-error {{constexpr variable 'nc4' must be initialized by a constant expression}} expected-note {{read of non-const variable 'i' is not allowed in a constant expression}}
+constexpr C nc5((C())); // expected-error {{cannot have non-literal type 'const C'}}
+int &f(); // expected-note {{here}}
+constexpr int &nc6(f()); // expected-error {{constexpr variable 'nc6' must be initialized by a constant expression}} expected-note {{non-constexpr function 'f'}}
+
+struct pixel {
+  int x, y;
+};
+constexpr pixel ur = { 1294, 1024 }; // ok
+constexpr pixel origin;              // expected-error {{default initialization of an object of const type 'const pixel' requires a user-provided default constructor}}