llvm-project/clang/test/CodeGenCXX/mangle-template.cpp

// RUN: %clang_cc1 -emit-llvm -o - %s | FileCheck %s
namespace test1 {
int x;
template <int& D> class T { };
// CHECK: void @_ZN5test12f0ENS_1TILZNS_1xEEEE(
void f0(T<x> a0) {}
}

namespace test1 {
// CHECK: void @_ZN5test12f0Ef
void f0(float) {}
template<void (&)(float)> struct t1 {};
// CHECK: void @_ZN5test12f1ENS_2t1ILZNS_2f0EfEEE(
void f1(t1<f0> a0) {}
}

namespace test2 {
// CHECK: void @_ZN5test22f0Ef
void f0(float) {}
template<void (*)(float)> struct t1 {};
// FIXME: Fails because we don't treat as an expression.
// CHECK-FIXME: void @_ZN5test22f1ENS_2t1IXadL_ZNS_2f0EfEEEE(
void f1(t1<f0> a0) {}
}

namespace test3 {
// CHECK: void @test3_f0
extern "C" void test3_f0(float) {}
template<void (&)(float)> struct t1 {};
// FIXME: Fails because we tack on a namespace.
// CHECK-FIXME: void @_ZN5test32f1ENS_2t1ILZ8test3_f0EEE(
void f1(t1<test3_f0> a0) {}
}

namespace test4 {
// CHECK: void @test4_f0
extern "C" void test4_f0(float) {}
template<void (*)(float)> struct t1 {};
// FIXME: Fails because we don't treat as an expression.
// CHECK-FIXME: void @_ZN5test42f1ENS_2t1IXadL_Z8test4_f0EEEE(
void f1(t1<test4_f0> a0) {}
}

// CHECK: void @test5_f0
extern "C" void test5_f0(float) {}
int main(int) {}

namespace test5 {
template<void (&)(float)> struct t1 {};
// CHECK: void @_ZN5test52f1ENS_2t1ILZ8test5_f0EEE(
void f1(t1<test5_f0> a0) {}

template<int (&)(int)> struct t2 {};
// CHECK: void @_ZN5test52f2ENS_2t2ILZ4mainEEE
void f2(t2<main> a0) {}
}

// FIXME: This fails.
namespace test6 {
struct A { void im0(float); };
// CHECK: void @_ZN5test61A3im0Ef
void A::im0(float) {}
template <void(A::*)(float)> class T { };
// FIXME: Fails because we don't treat as an expression.
// CHECK-FAIL: void @_ZN5test62f0ENS_1TIXadL_ZNS_1A3im0EfEEEE(
void f0(T<&A::im0> a0) {}
}

namespace test7 {
  template<typename T>
  struct meta {
    static const unsigned value = sizeof(T);
  };

  template<unsigned> struct int_c { 
    typedef float type;
  };

  template<typename T>
  struct X {
    template<typename U>
    X(U*, typename int_c<(meta<T>::value + meta<U>::value)>::type *) { }
  };

  // CHECK: define weak_odr void @_ZN5test71XIiEC1IdEEPT_PNS_5int_cIXplL_ZNS_4metaIiE5valueEEsrNS6_IS3_EE5valueEE4typeE(%"class.test1::T"* %this, double*, float*) unnamed_addr
  template X<int>::X(double*, float*);
}

namespace test8 {
  template<typename T>
  struct meta {
    struct type {
      static const unsigned value = sizeof(T);
    };
  };

  template<unsigned> struct int_c { 
    typedef float type;
  };

  template<typename T>
  void f(int_c<meta<T>::type::value>) { }

  // CHECK: define weak_odr void @_ZN5test81fIiEEvNS_5int_cIXsrNS_4metaIT_E4typeE5valueEEE
  template void f<int>(int_c<sizeof(int)>);
}

namespace test9 {
  template<typename T>
  struct supermeta {
    template<typename U>
    struct apply {
      typedef T U::*type;
    };
  };

  struct X { };

  template<typename T, typename U>
  typename supermeta<T>::template apply<U>::type f();

  void test_f() {
    // CHECK: @_ZN5test91fIiNS_1XEEENS_9supermetaIT_E5applyIT0_E4typeEv()
    // Note: GCC incorrectly mangles this as
    // _ZN5test91fIiNS_1XEEENS_9supermetaIT_E5apply4typeEv, while EDG
    // gets it right.
    f<int, X>();
  }
}

namespace test10 {
  template<typename T>
  struct X {
    template<typename U>
    struct definition {
    };
  };

  // CHECK: _ZN6test101fIidEENS_1XIT_E10definitionIT0_EES2_S5_
  template<typename T, typename U>
  typename X<T>::template definition<U> f(T, U) { }

  void g(int i, double d) {
    f(i, d);
  }
}