llvm-project/clang/test/SemaTemplate/instantiate-expr-1.cpp

// RUN: %clang_cc1 -fsyntax-only -verify %s  -triple x86_64-pc-linux-gnu
template<int I, int J>
struct Bitfields {
  int simple : I; // expected-error{{bit-field 'simple' has zero width}}
  int parens : (J);
};

void test_Bitfields(Bitfields<0, 5> *b) {
  (void)sizeof(Bitfields<10, 5>);
  (void)sizeof(Bitfields<0, 1>); // expected-note{{in instantiation of template class 'Bitfields<0, 1>' requested here}}
}

template<int I, int J>
struct BitfieldPlus {
  int bitfield : I + J; // expected-error{{bit-field 'bitfield' has zero width}}
};

void test_BitfieldPlus() {
  (void)sizeof(BitfieldPlus<0, 1>);
  (void)sizeof(BitfieldPlus<-5, 5>); // expected-note{{in instantiation of template class 'BitfieldPlus<-5, 5>' requested here}}
}

template<int I, int J>
struct BitfieldMinus {
  int bitfield : I - J; // expected-error{{bit-field 'bitfield' has negative width (-1)}} \
  // expected-error{{bit-field 'bitfield' has zero width}}
};

void test_BitfieldMinus() {
  (void)sizeof(BitfieldMinus<5, 1>);
  (void)sizeof(BitfieldMinus<0, 1>); // expected-note{{in instantiation of template class 'BitfieldMinus<0, 1>' requested here}}
  (void)sizeof(BitfieldMinus<5, 5>); // expected-note{{in instantiation of template class 'BitfieldMinus<5, 5>' requested here}}
}

template<int I, int J>
struct BitfieldDivide {
  int bitfield : I / J; // expected-error{{expression is not an integral constant expression}} \
                        // expected-note{{division by zero}}
};

void test_BitfieldDivide() {
  (void)sizeof(BitfieldDivide<5, 1>);
  (void)sizeof(BitfieldDivide<5, 0>); // expected-note{{in instantiation of template class 'BitfieldDivide<5, 0>' requested here}}
}

template<typename T, T I, int J>
struct BitfieldDep {
  int bitfield : I + J;
};

void test_BitfieldDep() {
  (void)sizeof(BitfieldDep<int, 1, 5>);
}

template<int I>
struct BitfieldNeg {
  int bitfield : (-I); // expected-error{{bit-field 'bitfield' has negative width (-5)}}
};

template<typename T, T I>
struct BitfieldNeg2 {
  int bitfield : (-I); // expected-error{{bit-field 'bitfield' has negative width (-5)}}
};

void test_BitfieldNeg() {
  (void)sizeof(BitfieldNeg<-5>); // okay
  (void)sizeof(BitfieldNeg<5>); // expected-note{{in instantiation of template class 'BitfieldNeg<5>' requested here}}
  (void)sizeof(BitfieldNeg2<int, -5>); // okay
  (void)sizeof(BitfieldNeg2<int, 5>); // expected-note{{in instantiation of template class 'BitfieldNeg2<int, 5>' requested here}}
}

template<typename T>
void increment(T &x) {
  (void)++x;
}

struct Incrementable {
  Incrementable &operator++();
};

void test_increment(Incrementable inc) {
  increment(inc);
}

template<typename T>
void add(const T &x) {
  (void)(x + x);
}

namespace PR6237 {
  template <typename T>
  void f(T t) {
    t++;
  }

  struct B { };
  B operator++(B &, int);

  template void f(B);
}

struct Addable {
  Addable operator+(const Addable&) const;
};

void test_add(Addable &a) {
  add(a);
}

struct CallOperator {
  int &operator()(int);
  double &operator()(double);
};

template<typename Result, typename F, typename Arg1>
Result test_call_operator(F f, Arg1 arg1) {
  // PR5266: non-dependent invocations of a function call operator.
  CallOperator call_op;
  int &ir = call_op(17);
  return f(arg1);
}

void test_call_operator(CallOperator call_op, int i, double d) {
  int &ir = test_call_operator<int&>(call_op, i);
  double &dr = test_call_operator<double&>(call_op, d);
}

template<typename T>
void test_asm(T t) {
  asm ("nop" : "=r"(*t) : "r"(*t)); // expected-error {{indirection requires pointer operand ('int' invalid)}}
}

void test_asm() {
  int* a;
  test_asm(a);
  
  int b;
  test_asm(b); // expected-note {{in instantiation of function template specialization 'test_asm<int>' requested here}}
}

namespace PR6424 {
  template<int I> struct X { 
    X() { 
      int *ip = I; // expected-error{{cannot initialize a variable of type 'int *' with an rvalue of type 'int'}}
    }
  };
  
  template<int> struct Y {
    typedef X<7> X7;
    
    void f() { X7(); } // expected-note{{instantiation}}
  };
  
  template void Y<3>::f(); 

  template<int I> 
  struct X2 {
    void *operator new(__SIZE_TYPE__) { 
      int *ip = I; // expected-error{{cannot initialize a variable of type 'int *' with an rvalue of type 'int'}}
      return ip;
    }
  };

  template<int> struct Y2 {
    typedef X2<7> X;
    void f() { 
      new X(); // expected-note{{instantiation of}}
    }
  };
  
  template void Y2<3>::f();

  template<typename T>
  void rdar10283928(int count) {
    (void)new char[count]();
  }

  template void rdar10283928<int>(int);
}

namespace PR10864 {
  template<typename T> class Vals {};
  template<> class Vals<int> { public: static const int i = 1; };
  template<> class Vals<float> { public: static const double i; };
  template<typename T> void test_asm_tied(T o) {
    __asm("addl $1, %0" : "=r" (o) : "0"(Vals<T>::i)); // expected-error {{input with type 'double' matching output with type 'float'}}
  }
  void test_asm_tied() {
    test_asm_tied(1);
    test_asm_tied(1.f); // expected-note {{instantiation of}}
  }
}