// RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-apple-darwin9 -fblocks -std=c++11 | FileCheck %s
struct X { };
struct Y { };

// CHECK: @unmangled_variable = global
// CHECK: @_ZN1N1iE = global
// CHECK: @_ZZN1N1fEiiE1b = internal global
// CHECK: @_ZZN1N1gEvE1a = internal global
// CHECK: @_ZGVZN1N1gEvE1a = internal global

//CHECK: @pr5966_i = external global
//CHECK: @_ZL8pr5966_j = internal global

// CHECK-LABEL: define zeroext i1 @_ZplRK1YRA100_P1X
bool operator+(const Y&, X* (&xs)[100]) { return false; }

// CHECK-LABEL: define void @_Z1f1s
typedef struct { int a; } s;
void f(s) { }

// CHECK-LABEL: define void @_Z1f1e
typedef enum { foo } e;
void f(e) { }

// CHECK-LABEL: define void @_Z1f1u
typedef union { int a; } u;
void f(u) { }

// CHECK-LABEL: define void @_Z1f1x
typedef struct { int a; } x,y;
void f(y) { }

// CHECK-LABEL: define void @_Z1fv
void f() { }

// CHECK-LABEL: define void @_ZN1N1fEv
namespace N { void f() { } }

// CHECK-LABEL: define void @_ZN1N1N1fEv
namespace N { namespace N { void f() { } } }

// CHECK-LABEL: define void @unmangled_function
extern "C" { namespace N { void unmangled_function() { } } }

extern "C" { namespace N { int unmangled_variable = 10; } }

namespace N { int i; }

namespace N { int f(int, int) { static int b; return b; } }

namespace N { int h(); void g() { static int a = h(); } }

// CHECK-LABEL: define void @_Z1fno
void f(__int128_t, __uint128_t) { } 

template <typename T> struct S1 {};

// CHECK-LABEL: define void @_Z1f2S1IiE
void f(S1<int>) {}

// CHECK-LABEL: define void @_Z1f2S1IdE
void f(S1<double>) {}

template <int N> struct S2 {};
// CHECK-LABEL: define void @_Z1f2S2ILi100EE
void f(S2<100>) {}

// CHECK-LABEL: define void @_Z1f2S2ILin100EE
void f(S2<-100>) {}

template <bool B> struct S3 {};

// CHECK-LABEL: define void @_Z1f2S3ILb1EE
void f(S3<true>) {}

// CHECK-LABEL: define void @_Z1f2S3ILb0EE
void f(S3<false>) {}

struct S;

// CHECK-LABEL: define void @_Z1fM1SKFvvE
void f(void (S::*)() const) {}

// CHECK-LABEL: define void @_Z1fM1SFvvE
void f(void (S::*)()) {}

// CHECK-LABEL: define void @_Z1fi
void f(const int) { }

template<typename T, typename U> void ft1(U u, T t) { }

template<typename T> void ft2(T t, void (*)(T), void (*)(T)) { }

template<typename T, typename U = S1<T> > struct S4 { };
template<typename T> void ft3(S4<T>*) {  }

namespace NS {
  template<typename T> void ft1(T) { }
}

void g1() {
  // CHECK: @_Z3ft1IidEvT0_T_
  ft1<int, double>(1, 0);
  
  // CHECK: @_Z3ft2IcEvT_PFvS0_ES2_
  ft2<char>(1, 0, 0);
  
  // CHECK: @_Z3ft3IiEvP2S4IT_2S1IS1_EE
  ft3<int>(0);
  
  // CHECK: @_ZN2NS3ft1IiEEvT_
  NS::ft1<int>(1);
}

// Expressions
template<int I> struct S5 { };

template<int I> void ft4(S5<I>) { }
void g2() {
  // CHECK: @_Z3ft4ILi10EEv2S5IXT_EE
  ft4(S5<10>());
  
  // CHECK: @_Z3ft4ILi20EEv2S5IXT_EE
  ft4(S5<20>());
}

extern "C++" {
  // CHECK: @_Z1hv
 void h() { } 
}

// PR5019
extern "C" { struct a { int b; }; }

// CHECK: @_Z1fP1a
int f(struct a *x) {
    return x->b;
}

// PR5017
extern "C" {
struct Debug {
  const Debug& operator<< (unsigned a) const { return *this; }
};
Debug dbg;
// CHECK: @_ZNK5DebuglsEj
int main(void) {  dbg << 32 ;}
}

template<typename T> struct S6 {
  typedef int B;
};

template<typename T> void ft5(typename S6<T>::B) { }
// CHECK: @_Z3ft5IiEvN2S6IT_E1BE
template void ft5<int>(int);

template<typename T> class A {};

namespace NS {
template<typename T> bool operator==(const A<T>&, const A<T>&) { return true; }
}

// CHECK: @_ZN2NSeqIcEEbRK1AIT_ES5_
template bool NS::operator==(const ::A<char>&, const ::A<char>&);

namespace std {
template<typename T> bool operator==(const A<T>&, const A<T>&) { return true; }
}

// CHECK: @_ZSteqIcEbRK1AIT_ES4_
template bool std::operator==(const ::A<char>&, const ::A<char>&);

struct S {
  typedef int U;
};

template <typename T> typename T::U ft6(const T&) { return 0; }

// CHECK: @_Z3ft6I1SENT_1UERKS1_
template int ft6<S>(const S&);

template<typename> struct __is_scalar_type {
  enum { __value = 1 };
};

template<bool, typename> struct __enable_if { };

template<typename T> struct __enable_if<true, T> {
  typedef T __type;
};

// PR5063
template<typename T> typename __enable_if<__is_scalar_type<T>::__value, void>::__type ft7() { }

// CHECK: @_Z3ft7IiEN11__enable_ifIXsr16__is_scalar_typeIT_EE7__valueEvE6__typeEv
template void ft7<int>();
// CHECK: @_Z3ft7IPvEN11__enable_ifIXsr16__is_scalar_typeIT_EE7__valueEvE6__typeEv
template void ft7<void*>();

// PR5144
extern "C" {
void extern_f(void);
};

// CHECK: @extern_f
void extern_f(void) { }

struct S7 {
  S7();
  
  struct S { S(); };
  struct {
    S s;
  } a;
};

// PR5139
// CHECK: @_ZN2S7C2Ev
// CHECK: @_ZN2S7Ut_C1Ev
// CHECK: @_ZN2S7C1Ev
S7::S7() {}

// PR5063
template<typename T> typename __enable_if<(__is_scalar_type<T>::__value), void>::__type ft8() { }
// CHECK: @_Z3ft8IiEN11__enable_ifIXsr16__is_scalar_typeIT_EE7__valueEvE6__typeEv
template void ft8<int>();
// CHECK: @_Z3ft8IPvEN11__enable_ifIXsr16__is_scalar_typeIT_EE7__valueEvE6__typeEv
template void ft8<void*>();

// PR5796
namespace PR5796 {
template<typename> struct __is_scalar_type {
  enum { __value = 0 };
};

template<bool, typename> struct __enable_if {};
template<typename T> struct __enable_if<true, T> { typedef T __type; };
template<typename T>

// CHECK-LABEL: define linkonce_odr void @_ZN6PR57968__fill_aIiEENS_11__enable_ifIXntsr16__is_scalar_typeIT_EE7__valueEvE6__typeEv
typename __enable_if<!__is_scalar_type<T>::__value, void>::__type __fill_a() { };

void f() { __fill_a<int>(); }
}

namespace Expressions {
// Unary operators.

// CHECK-LABEL: define weak_odr void @_ZN11Expressions2f1ILi1EEEvPAplngT_Li2E_i
template <int i> void f1(int (*)[(-i) + 2]) { };
template void f1<1>(int (*)[1]);

// CHECK-LABEL: define weak_odr void @_ZN11Expressions2f2ILi1EEEvPApsT__i
template <int i> void f2(int (*)[+i]) { };
template void f2<1>(int (*)[1]);

// Binary operators.

// CHECK-LABEL: define weak_odr void @_ZN11Expressions2f3ILi1EEEvPAplT_T__i
template <int i> void f3(int (*)[i+i]) { };
template void f3<1>(int (*)[2]);

// CHECK-LABEL: define weak_odr void @_ZN11Expressions2f4ILi1EEEvPAplplLi2ET_T__i
template <int i> void f4(int (*)[2 + i+i]) { };
template void f4<1>(int (*)[4]);

// The ternary operator.
// CHECK-LABEL: define weak_odr void @_ZN11Expressions2f4ILb1EEEvPAquT_Li1ELi2E_i
template <bool b> void f4(int (*)[b ? 1 : 2]) { };
template void f4<true>(int (*)[1]);
}

struct Ops {
  Ops& operator+(const Ops&);
  Ops& operator-(const Ops&);
  Ops& operator&(const Ops&);
  Ops& operator*(const Ops&);
  
  void *v;
};

// CHECK-LABEL: define nonnull align {{[0-9]+}} dereferenceable({{[0-9]+}}) %struct.Ops* @_ZN3OpsplERKS_
Ops& Ops::operator+(const Ops&) { return *this; }
// CHECK-LABEL: define nonnull align {{[0-9]+}} dereferenceable({{[0-9]+}}) %struct.Ops* @_ZN3OpsmiERKS_
Ops& Ops::operator-(const Ops&) { return *this; }
// CHECK-LABEL: define nonnull align {{[0-9]+}} dereferenceable({{[0-9]+}}) %struct.Ops* @_ZN3OpsanERKS_
Ops& Ops::operator&(const Ops&) { return *this; }
// CHECK-LABEL: define nonnull align {{[0-9]+}} dereferenceable({{[0-9]+}}) %struct.Ops* @_ZN3OpsmlERKS_
Ops& Ops::operator*(const Ops&) { return *this; }

// PR5861
namespace PR5861 {
template<bool> class P;
template<> class P<true> {};

template<template <bool> class, bool>
struct Policy { };

template<typename T, typename = Policy<P, true> > class Alloc
{
  T *allocate(int, const void*) { return 0; }
};

// CHECK-LABEL: define weak_odr i8* @_ZN6PR58615AllocIcNS_6PolicyINS_1PELb1EEEE8allocateEiPKv
template class Alloc<char>;
}

// CHECK-LABEL: define void @_Z1fU13block_pointerFiiiE
void f(int (^)(int, int)) { }

void pr5966_foo() {
  extern int pr5966_i;
  pr5966_i = 0;
}

static int pr5966_j;

void pr5966_bar() {
  pr5966_j = 0;
}

namespace test0 {
  int ovl(int x);
  char ovl(double x);

  template <class T> void f(T, char (&buffer)[sizeof(ovl(T()))]) {}

  void test0() {
    char buffer[1];
    f(0.0, buffer);
  }
  // CHECK-LABEL: define void @_ZN5test05test0Ev()
  // CHECK-LABEL: define linkonce_odr void @_ZN5test01fIdEEvT_RAszcl3ovlcvS1__EE_c(

  void test1() {
    char buffer[sizeof(int)];
    f(1, buffer);
  }
  // CHECK-LABEL: define void @_ZN5test05test1Ev()
  // CHECK-LABEL: define linkonce_odr void @_ZN5test01fIiEEvT_RAszcl3ovlcvS1__EE_c(

  template <class T> void g(char (&buffer)[sizeof(T() + 5.0f)]) {}
  void test2() {
    char buffer[sizeof(float)];
    g<float>(buffer);
  }
  // CHECK-LABEL: define linkonce_odr void @_ZN5test01gIfEEvRAszplcvT__ELf40a00000E_c(

  template <class T> void h(char (&buffer)[sizeof(T() + 5.0)]) {}
  void test3() {
    char buffer[sizeof(double)];
    h<float>(buffer);
  }
  // CHECK-LABEL: define linkonce_odr void @_ZN5test01hIfEEvRAszplcvT__ELd4014000000000000E_c(

  template <class T> void j(char (&buffer)[sizeof(T().buffer)]) {}
  struct A { double buffer[128]; };
  void test4() {
    char buffer[1024];
    j<A>(buffer);
  }
  // CHECK-LABEL: define linkonce_odr void @_ZN5test01jINS_1AEEEvRAszdtcvT__E6buffer_c(

  template <class T> void k(char (&buffer)[sizeof(T() + 0.0f)]) {}
  void test5() {
    char buffer[sizeof(float)];
    k<float>(buffer);
  }
  // CHECK-LABEL: define linkonce_odr void @_ZN5test01kIfEEvRAszplcvT__ELf00000000E_c(

}

namespace test1 {
  template<typename T> struct X { };
  template<template<class> class Y, typename T> void f(Y<T>) { }
  // CHECK-LABEL: define weak_odr void @_ZN5test11fINS_1XEiEEvT_IT0_E
  template void f(X<int>);
}

// CHECK-LABEL: define internal void @_ZL27functionWithInternalLinkagev()
static void functionWithInternalLinkage() {  }
void g() { functionWithInternalLinkage(); }

namespace test2 {
  template <class T> decltype(((T*) 0)->member) read_member(T& obj) {
    return obj.member;
  }

  struct A { int member; } obj;
  int test() {
    return read_member(obj);
  }

  // CHECK-LABEL: define linkonce_odr i32 @_ZN5test211read_memberINS_1AEEEDtptcvPT_Li0E6memberERS2_(
}

// rdar://problem/9280586
namespace test3 {
  struct AmbiguousBase { int ab; };
  struct Path1 : AmbiguousBase { float p; };
  struct Path2 : AmbiguousBase { double p; };
  struct Derived : Path1, Path2 { };

  // CHECK-LABEL: define linkonce_odr i32 @_ZN5test38get_ab_1INS_7DerivedEEEDtptcvPT_Li0Esr5Path1E2abERS2_(
  template <class T> decltype(((T*) 0)->Path1::ab) get_ab_1(T &ref) { return ref.Path1::ab; }

  // CHECK-LABEL: define linkonce_odr i32 @_ZN5test38get_ab_2INS_7DerivedEEEDtptcvPT_Li0Esr5Path2E2abERS2_(
  template <class T> decltype(((T*) 0)->Path2::ab) get_ab_2(T &ref) { return ref.Path2::ab; }

  // CHECK-LABEL: define linkonce_odr float @_ZN5test37get_p_1INS_7DerivedEEEDtptcvPT_Li0Esr5Path1E1pERS2_(
  template <class T> decltype(((T*) 0)->Path1::p) get_p_1(T &ref) { return ref.Path1::p; }

  // CHECK-LABEL: define linkonce_odr double @_ZN5test37get_p_2INS_7DerivedEEEDtptcvPT_Li0Esr5Path2E1pERS2_(
  template <class T> decltype(((T*) 0)->Path2::p) get_p_2(T &ref) { return ref.Path2::p; }

  Derived obj;
  void test() {
    get_ab_1(obj);
    get_ab_2(obj);
    get_p_1(obj);
    get_p_2(obj);
  }
}

// CHECK-LABEL: define void @_ZN5test41gEPNS_3zedIXadL_ZNS_3foo3barEEEEE
namespace test4 {
  struct foo { int bar; };
  template <int (foo::*)>
  struct zed {};
  void g(zed<&foo::bar>*)
  {}
}
// CHECK-LABEL: define void @_ZN5test51gEPNS_3zedIXadL_ZNS_3foo3barEEEEE
namespace test5 {
  struct foo { static int bar; };
  template <int *>
  struct zed {};
  void g(zed<&foo::bar>*)
  {}
}
// CHECK-LABEL: define void @_ZN5test61gEPNS_3zedIXadL_ZNS_3foo3barEvEEEE
namespace test6 {
  struct foo { int bar(); };
  template <int (foo::*)()>
  struct zed {};
  void g(zed<&foo::bar>*)
  {}
}
// CHECK-LABEL: define void @_ZN5test71gEPNS_3zedIXadL_ZNS_3foo3barEvEEEE
namespace test7 {
  struct foo { static int bar(); };
  template <int (*f)()>
  struct zed {};
  void g(zed<&foo::bar>*)
  {}
}
// CHECK-LABEL: define weak_odr void @_ZN5test81AIL_ZNS_1B5valueEEE3incEv
namespace test8 {
  template <int &counter> class A { void inc() { counter++; } };
  class B { public: static int value; };
  template class A<B::value>;
}
// CHECK: declare void @_ZN5test91fIiNS_3barEEEvRKNT0_3baz1XE
namespace test9 {
  template<class T>
  struct foo {
    typedef T X;
  };
  struct bar {
    typedef foo<int> baz;
  };
  template <class zaz, class zed>
  void f(const typename zed::baz::X&);
  void g() {
    f<int, bar>( 0);
  }
}

// <rdar://problem/7825453>
namespace test10 {
  template <char P1> struct S {};
  template <char P2> void f(struct S<false ? 'a' : P2> ) {}

  // CHECK-LABEL: define weak_odr void @_ZN6test101fILc3EEEvNS_1SIXquLb0ELc97ET_EEE(
  template void f<(char) 3>(struct S<3>);
}

namespace test11 {
  // CHECK: @_ZN6test111fEz
  void f(...) { }

  struct A {
    void f(...);
  };
  
  // CHECK: @_ZN6test111A1fEz
  void A::f(...) { }
}

namespace test12 {

  // CHECK: _ZN6test121fENS_1AILt33000EEE
  template <unsigned short> struct A { };
  void f(A<33000>) { }
}

// PR7446
namespace test13 {
  template <template <class> class T> class A {};
  template <class U> class B {};

  template <template<class> class T> void foo(const A<T> &a) {}

  // CHECK-LABEL: define weak_odr void @_ZN6test133fooINS_1BEEEvRKNS_1AIT_EE(
  template void foo(const A<B> &a);
}

namespace test14 {
  extern "C" {
    struct S {
      static int a(), x;
    };
    // CHECK-LABEL: define i32 @_ZN6test141S1aEv
    // CHECK: load i32, i32* @_ZN6test141S1xE
    int S::a() { return S::x; }
  }
}

// rdar://problem/8204122
namespace test15 {
  enum E { e = 3 };
  template <int I> struct S {};

  template <int I> void f(S<I + e>) {}

  // CHECK-LABEL: define weak_odr void @_ZN6test151fILi7EEEvNS_1SIXplT_LNS_1EE3EEEE(
  template void f<7>(S<7 + e>);
}

// rdar://problem/8302148
namespace test17 {
  template <int N> struct A {};

  struct B {
    static int foo(void);
  };

  template <class T> A<sizeof(T::foo())> func(void);

  // CHECK-LABEL: define void @_ZN6test174testEv()
  // CHECK: call {{.*}} @_ZN6test174funcINS_1BEEENS_1AIXszclsrT_3fooEEEEv()
  void test() {
    func<B>();
  }
}

// PR7891
namespace test18 {
  struct A {
    int operator+();
    int operator-();
    int operator*();
    int operator&();
  };
  template <int (A::*)()> struct S {};

  template <typename T> void f(S<&T::operator+>) {}
  template void f<A>(S<&A::operator+>);

  template <typename T> void f(S<&T::operator- >) {}
  template void f<A>(S<&A::operator- >);

  template <typename T> void f(S<&T::operator*>) {}
  template void f<A>(S<&A::operator*>);

  template <typename T> void f(S<&T::operator&>) {}
  template void f<A>(S<&A::operator&>);

  // CHECK-LABEL: define weak_odr void @_ZN6test181fINS_1AEEEvNS_1SIXadsrT_onplEEE
  // CHECK-LABEL: define weak_odr void @_ZN6test181fINS_1AEEEvNS_1SIXadsrT_onmiEEE
  // CHECK-LABEL: define weak_odr void @_ZN6test181fINS_1AEEEvNS_1SIXadsrT_onmlEEE
  // CHECK-LABEL: define weak_odr void @_ZN6test181fINS_1AEEEvNS_1SIXadsrT_onanEEE
}

// rdar://problem/8332117
namespace test19 {
  struct A {
    template <typename T> int f();
    int operator+();
    operator int();
    template <typename T> int operator-();
  };

  template <int (A::*)()> struct S {};

  template <typename T> void g (S<&T::template f<int> >) {}
  template <typename T> void g (S<&T::operator+ >) {}
  template <typename T> void g (S<&T::operator int>) {}
  template <typename T> void g (S<&T::template operator- <double> >) {}

  // CHECK-LABEL: define weak_odr void @_ZN6test191gINS_1AEEEvNS_1SIXadsrT_1fIiEEEE(
  template void g<A>(S<&A::f<int> >);
  // CHECK-LABEL: define weak_odr void @_ZN6test191gINS_1AEEEvNS_1SIXadsrT_onplEEE(
  template void g<A>(S<&A::operator+>);
  // CHECK-LABEL: define weak_odr void @_ZN6test191gINS_1AEEEvNS_1SIXadsrT_oncviEEE(
  template void g<A>(S<&A::operator int>);
  // CHECK-LABEL: define weak_odr void @_ZN6test191gINS_1AEEEvNS_1SIXadsrT_onmiIdEEEE(
  template void g<A>(S<&A::operator-<double> >);
}

namespace test20 {
  template <class T> T *f(const T&);
  template <class T> T *f(T*);

  // CHECK-LABEL: define weak_odr void @_ZN6test205test0IiEEvDTcl1fIPT_ELi0EEE(
  template <class T> void test0(decltype(f<T*>(0))) {}
  template void test0<int>(decltype(f<int*>(0)));

  // CHECK-LABEL: define weak_odr void @_ZN6test205test1IiEEvDTcl1fIEcvT__EEE(
  template <class T> void test1(decltype(f<>(T()))) {}
  template void test1<int>(decltype(f<>(int())));
}

// rdar:// 8620510
namespace test21 {
  // CHECK-LABEL: define void @_ZN6test2112vla_arg_funcEiPA_i(
  void vla_arg_func(int X, int a[X][X]) {}
}

namespace test22 {
  // CHECK-LABEL: define void @_ZN6test221fEDn(
  void f(decltype(nullptr)) { }
}

// rdar://problem/8913416
namespace test23 {
  typedef void * const vpc;

  // CHECK-LABEL: define void @_ZN6test231fERA10_KPv(
  void f(vpc (&)[10]) {}

  typedef vpc vpca5[5];
  void f(vpca5 volatile (&)[10]) {}
  // CHECK-LABEL: define void @_ZN6test231fERA10_A5_VKPv(
}

namespace test24 {
  void test0() {
    extern int foo();
    // CHECK: call i32 @_ZN6test243fooEv()
    foo();
  }

  static char bar() {}
  void test1() {
    // CHECK: call signext i8 @_ZN6test24L3barEv()
    bar();
  }
}

// rdar://problem/8806641
namespace test25 {
  template <void (*fn)()> struct A {
    static void call() { fn(); }
  };
  void foo();
  void test() {
    // CHECK: call void @_ZN6test251AIXadL_ZNS_3fooEvEEE4callEv()
    A<foo>::call();
  }
}

namespace test26 {
  template <template <class> class T> void foo(decltype(T<float>::object) &object) {}

  template <class T> struct holder { static T object; };

  void test() {
    float f;

    // CHECK: call void @_ZN6test263fooINS_6holderEEEvRDtsrT_IfE6objectE(
    foo<holder>(f);
  }
}

namespace test27 {
  struct A {
    struct inner {
      float object;
    };

    float meth();
  };
  typedef A Alias;

  template <class T> void a(decltype(T::inner::object) &object) {}
  template <class T> void b(decltype(T().Alias::meth()) &object) {}

  void test() {
    float f;
    // CHECK: call void @_ZN6test271aINS_1AEEEvRDtsrNT_5innerE6objectE(
    a<A>(f);
    // CHECK: call void @_ZN6test271bINS_1AEEEvRDTcldtcvT__Esr5AliasE4methEE(
    b<A>(f);
  }
}

// An injected class name type in a unresolved-name.
namespace test28 {
  template <class T> struct A {
    enum { bit };
  };

  template <class T> void foo(decltype(A<T>::A::bit) x);

  void test() {
    foo<char>(A<char>::bit);
    // CHECK: call void @_ZN6test283fooIcEEvDtsr1AIT_E1AE3bitE(
  }
}

// An enclosing template type parameter in an unresolved-name.
namespace test29 {
  template <class T> struct A {
    template <class U> static void foo(decltype(T::fn(U())) x);
  };
  struct B { static int fn(int); static long fn(long); };

  void test() {
    A<B>::foo<int>(0);
    // CHECK: call void @_ZN6test291AINS_1BEE3fooIiEEvDTclsrS1_2fncvT__EEE(
  }
}

// An enclosing template template parameter in an unresolved-name.
namespace test30 {
  template <template <class> class T> struct A {
    template <class U> static void foo(decltype(T<U>::fn()) x);
  };
  template <class T> struct B { static T fn(); };

  void test() {
    A<B>::foo<int>(0);
    // CHECK: call void @_ZN6test301AINS_1BEE3fooIiEEvDTclsrS1_IT_EE2fnEE(
  }
}

namespace test31 { // instantiation-dependent mangling of decltype
  int x;
  template<class T> auto f1(T p)->decltype(x) { return 0; }
  // The return type in the mangling of the template signature
  // is encoded as "i".
  template<class T> auto f2(T p)->decltype(p) { return 0; }
  // The return type in the mangling of the template signature
  // is encoded as "Dtfp_E".
  void g(int);
  template<class T> auto f3(T p)->decltype(g(p)) {}

  // CHECK-LABEL: define weak_odr i32 @_ZN6test312f1IiEEiT_(
  template int f1(int);
  // CHECK-LABEL: define weak_odr i32 @_ZN6test312f2IiEEDtfp_ET_
  template int f2(int);
  // CHECK-LABEL: define weak_odr void @_ZN6test312f3IiEEDTcl1gfp_EET_
  template void f3(int);
}

// PR10205
namespace test32 {
  template<typename T, int=T::value> struct A {
    typedef int type;
  };
  struct B { enum { value = 4 }; };

  template <class T> typename A<T>::type foo() { return 0; }
  void test() {
    foo<B>();
    // CHECK: call i32 @_ZN6test323fooINS_1BEEENS_1AIT_XsrS3_5valueEE4typeEv()
  }
}

namespace test33 {
  template <class T> struct X {
    enum { value = T::value };
  };

  template<typename T, int=X<T>::value> struct A {
    typedef int type;
  };
  struct B { enum { value = 4 }; };

  template <class T> typename A<T>::type foo() { return 0; }

  void test() {
    foo<B>();
    // CHECK: call i32 @_ZN6test333fooINS_1BEEENS_1AIT_Xsr1XIS3_EE5valueEE4typeEv()
  }
}

namespace test34 {
  // Mangling for instantiation-dependent decltype expressions.
  template<typename T>
  void f(decltype(sizeof(decltype(T() + T())))) {}

  // CHECK-LABEL: define weak_odr void @_ZN6test341fIiEEvDTstDTplcvT__EcvS1__EEE
  template void f<int>(decltype(sizeof(1)));

  // Mangling for non-instantiation-dependent sizeof expressions.
  template<unsigned N>
  void f2(int (&)[N + sizeof(int*)]) {}

  // CHECK-LABEL: define weak_odr void @_ZN6test342f2ILj4EEEvRAplT_Lm8E_i
  template void f2<4>(int (&)[4 + sizeof(int*)]);

  // Mangling for non-instantiation-dependent sizeof expressions
  // involving an implicit conversion of the result of the sizeof.
  template<unsigned long long N>
  void f3(int (&)[N + sizeof(int*)]) {}

  // CHECK-LABEL: define weak_odr void @_ZN6test342f3ILy4EEEvRAplT_Ly8E_i
  template void f3<4>(int (&)[4 + sizeof(int*)]);

  // Mangling for instantiation-dependent sizeof() expressions as
  // template arguments.
  template<unsigned> struct A { };

  template<typename T> void f4(::test34::A<sizeof(sizeof(decltype(T() + T())))>) { }

  // CHECK-LABEL: define weak_odr void @_ZN6test342f4IiEEvNS_1AIXszstDTplcvT__EcvS2__EEEEE
  template void f4<int>(A<sizeof(sizeof(int))>);
}

namespace test35 {
  // Dependent operator names of unknown arity.
  struct A { 
    template<typename U> A operator+(U) const;
  };

  template<typename T>
  void f1(decltype(sizeof(&T::template operator+<int>))) {}

  // CHECK-LABEL: define weak_odr void @_ZN6test352f1INS_1AEEEvDTszadsrT_onplIiEE
  template void f1<A>(__SIZE_TYPE__);
}

namespace test36 {
  template<unsigned> struct A { };

  template<typename ...Types>
  auto f1(Types... values) -> A<sizeof...(values)> { }

  // CHECK: define weak_odr {{.*}} @_ZN6test362f1IJifEEENS_1AIXsZfp_EEEDpT_
  template A<2> f1(int, float);
}

namespace test37 {
  struct foo {
    struct {
    } a;
    typedef struct { } b;
    typedef struct { } *c;
    struct {
    } d;
  };
  template<typename T> void func(T) { }
  void test() {
    // CHECK-LABEL: define linkonce_odr void @_ZN6test374funcINS_3fooUt_EEEvT_
    func(foo().a);
    // CHECK-LABEL: define linkonce_odr void @_ZN6test374funcINS_3fooUt0_EEEvT_
    func(*foo::c());
    // CHECK-LABEL: define linkonce_odr void @_ZN6test374funcINS_3fooUt1_EEEvT_
    func(foo().d);
  }
}

// CHECK-LABEL: define void @_Z6ASfuncPU3AS3i
void ASfunc(__attribute__((address_space(3))) int* x) {}

namespace test38 {
  // CHECK-LABEL: define linkonce_odr void @_ZN6test384funcINS_3fooUt_EEEvT_
  typedef struct {
    struct {
    } a;
  } foo;

  template <typename T> void func(T) {}
  void test() { func(foo().a); }
}

namespace test39 {
  // CHECK-LABEL: define internal void @"_ZN6test394funcINS_3$_03$_1EEEvT_"
  typedef struct {
    struct {} a;
  } *foo;
  template<typename T> void func(T) {}
  void test() {
    foo x;
    func(x->a);
  }
}

namespace test40 {
  // CHECK: i32* {{.*}} @_ZZN6test401fEvE1a_0
  void h(int&);
  inline void f() {
    if (0) {
      static int a;
    }
    static int a;
    h(a);
  };
  void g() { f(); }
}

namespace test41 {
  // CHECK: define linkonce_odr void @_ZN6test414funcINS_1XEEEvNS_3fooILi20ES1_EE
  template <int i, class T> struct foo {
    template <class T2 = T> friend void func(foo x) {}
  };

  struct X {};

  void g() { func(foo<20, X>()); }
}

namespace test42 {
  // CHECK: define linkonce_odr void @_ZN6test424funcINS_1XEEEvNS_3fooILi20ES1_EE
  template <int i, template <class> class T> struct foo {
    template <template <class> class T2 = T> friend void func(foo x) {}
  };

  template <class V> struct X {
  };

  void g() { func(foo<20, X>()); }
}

namespace test43 {
  // CHECK-LABEL: define void @_ZN6test431gEPNS_3zedIXadL_ZNS_3fooUt_3barEEEEE
  struct foo { union { int bar; }; };
  template <int (foo::*)>
  struct zed {};
  void g(zed<&foo::bar>*)
  {}
}

namespace test44 {
  struct foo { void bar() __restrict { }; } obj;

  void f() {
    obj.bar();
  }
  // CHECK-LABEL: define linkonce_odr void @_ZN6test443foo3barEv(%"struct.test44::foo"* %this)
}

namespace test45 {
  struct S {
    enum e {};
  };
  template <typename T>
  void f(enum T::e *) {}
  template void f<S>(S::e *);
  // CHECK-LABEL: define weak_odr void @_ZN6test451fINS_1SEEEvPTeNT_1eE(i32* %0)
}

namespace test46 {
  struct S {
    struct s {};
  };
  template <typename T>
  void f(struct T::s *) {}
  template void f<S>(S::s *);
  // CHECK-LABEL: define weak_odr void @_ZN6test461fINS_1SEEEvPTsNT_1sE(%"struct.test46::S::s"* %0)
}

namespace test47 {
  struct S {
    class c {};
  };
  template <typename T>
  void f(class T::c *) {}
  template void f<S>(S::c *);
  // CHECK-LABEL: define weak_odr void @_ZN6test471fINS_1SEEEvPTsNT_1cE(%"class.test47::S::c"* %0)
}

namespace test48 {
  struct S {
    union u {};
  };
  template <typename T>
  void f(union T::u *) {}
  template void f<S>(S::u *);
  // CHECK-LABEL: define weak_odr void @_ZN6test481fINS_1SEEEvPTuNT_1uE(%"union.test48::S::u"* %0)
}

namespace test49 {
  template <int>
  struct S {};

  template <template <int> class T>
  T<3> fin(T<3>);

  auto v = fin<S>;
  // CHECK-LABEL: declare void @_ZN6test493finINS_1SEEET_ILi3EES3_()
}

namespace test50 {
  template <int>
  struct S {};

  template <template <int> class T>
  T<3> fin(T<4>);

  auto v = fin<S>;
  // CHECK-LABEL: declare void @_ZN6test503finINS_1SEEET_ILi3EES2_ILi4EE()
}

namespace test51 {
  template <typename T>
  decltype(T().~T()) fun() {}
  template void fun<int>();
  // CHECK-LABEL: @_ZN6test513funIiEEDTcldtcvT__EdnS1_EEv
  template void fun<X>();
  // CHECK-LABEL: @_ZN6test513funI1XEEDTcldtcvT__EdnS2_EEv
  template void fun<S1<int> >();
  // CHECK-LABEL: @_ZN6test513funI2S1IiEEEDTcldtcvT__EdnS3_EEv

  enum E {};
  template <typename T>
  struct X {
    struct Y {};
  };

  template <typename T>
  decltype(S1<T>().~S1<T>()) fun1() {};
  template <typename U, typename T>
  decltype(U().~S1<T>()) fun2() {}
  template <typename U, typename T>
  decltype(S1<T>().~U()) fun3() {}
  template <typename T>
  decltype(S1<T>().~S1<T>(), S1<T>().~S1<T>()) fun4() {};
  template <typename T>
  decltype(S1<int>().~S1<T>()) fun5(){};
  template <template <typename T> class U>
  decltype(S1<int>().~U<int>()) fun6(){};
  template <typename T>
  decltype(E().E::~T()) fun7() {}
  template <template <typename> class U>
  decltype(X<int>::Y().U<int>::Y::~Y()) fun8() {}
  template void fun1<int>();
  // CHECK-LABEL: @_ZN6test514fun1IiEEDTcldtcv2S1IT_E_Edn2S1IS2_EEEv
  template void fun2<S1<int>, int>();
  // CHECK-LABEL: @_ZN6test514fun2I2S1IiEiEEDTcldtcvT__Edn2S1IT0_EEEv
  template void fun3<S1<int>, int>();
  // CHECK-LABEL: @_ZN6test514fun3I2S1IiEiEEDTcldtcvS1_IT0_E_EdnT_EEv
  template void fun4<int>();
  // CHECK-LABEL: @_ZN6test514fun4IiEEDTcmcldtcv2S1IT_E_Edn2S1IS2_EEcldtcvS3__Edn2S1IS2_EEEv
  template void fun5<int>();
  // CHECK-LABEL: @_ZN6test514fun5IiEEDTcldtcv2S1IiE_Edn2S1IT_EEEv
  template void fun6<S1>();
  // CHECK-LABEL: @_ZN6test514fun6I2S1EEDTcldtcvS1_IiE_EdnT_IiEEEv
  template void fun7<E>();
  // CHECK-LABEL: @_ZN6test514fun7INS_1EEEEDTcldtcvS1__Esr1EEdnT_EEv
  template void fun8<X>();
}

namespace test52 {
struct X {};
void operator+(X);
template <typename... T>
auto f4(T... x) -> decltype(operator+(x...));
// CHECK-LABEL: @_ZN6test522f4IJNS_1XEEEEDTclonplspfp_EEDpT_
void use() { f4(X{}); }
}

namespace test53 {
struct c {
  using t1 = struct { int z; };
  using t2 = struct { double z; };
  using t3 = struct { float z; };
  using t4 = struct { float z; };

  __attribute__((used)) c(t1) {}
  __attribute__((used)) c(t2) {}
  __attribute__((used)) c(t3) {}
  __attribute__((used)) c(t4) {}
  // CHECK-LABEL: @_ZN6test531cC2ENS0_2t1E
  // CHECK-LABEL: @_ZN6test531cC2ENS0_2t2E
  // CHECK-LABEL: @_ZN6test531cC2ENS0_2t3E
  // CHECK-LABEL: @_ZN6test531cC2ENS0_2t4E
};
}

namespace test54 {
struct c {
  using t1 = struct { int z; } *;
  using t2 = struct { double z; } *;

  __attribute__((used)) c(t1) {}
  __attribute__((used)) c(t2) {}
  // CHECK-LABEL: @_ZN6test541cC2EPNS0_Ut_E
  // CHECK-LABEL: @_ZN6test541cC2EPNS0_Ut0_E
};
}

namespace test55 {
enum E { R };

template <typename T>
void fn(T, __underlying_type(T)) {}

template void fn<E>(E, __underlying_type(E));
// CHECK-LABEL: @_ZN6test552fnINS_1EEEEvT_U3eutS2_
}

namespace test56 {
  struct A { A *operator->(); int n; } a;
  template<int N> void f(decltype(a->n + N)) {}
  // CHECK-LABEL: @_ZN6test561fILi0EEEvDTplptL_ZNS_1aEE1nT_E
  template void f<0>(int);
}

namespace test57 {
  struct X { template <int N> int f(); } x;
  template<int N> void f(decltype(x.f<0>() + N)) {}
  // CHECK-LABEL: @_ZN6test571fILi0EEEvDTplcldtL_ZNS_1xEE1fIXLi0EEEET_E
  template void f<0>(int);
}

namespace test58 {
  struct State {
   bool m_fn1();
  } a;
  template <class T> struct identity { typedef T type; };
  struct A {
   template <typename T> A(T, bool (identity<T>::type::*)());
  };
  // CHECK-LABEL: @_ZN6test581AC1INS_5StateEEET_MNS_8identityIS3_E4typeEFbvE
  void fn1() { A(a, &State::m_fn1); }
}

namespace test59 {
  // verify no crash.
  template<typename T>
  void f(T g) {
    auto [e] = g;
    [](decltype(e)) {};
  }
}

namespace test60 {
  struct X { int i, j; };
  auto [a,b] = X{1,2};
  template<typename T> void f(decltype(a + T())) {}
  // CHECK-LABEL: @_ZN6test601fIiEEvDTplL_ZNS_1aEEcvT__EE
  template void f<int>(int);
}