1// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -fsyntax-only -verify -std=c++11 -Wsign-conversion %s
2
3// C++ rules for ?: are a lot stricter than C rules, and have to take into
4// account more conversion options.
5// This test runs in C++11 mode for the contextual conversion of the condition.
6
7struct ToBool { explicit operator bool(); };
8
9struct B;
10struct A {
11  A();
12  A(const B&); // expected-note 2 {{candidate constructor}}
13};
14struct B { operator A() const; }; // expected-note 2 {{candidate function}}
15struct I { operator int(); };
16struct J { operator I(); };
17struct K { operator double(); };
18typedef void (*vfn)();
19struct F { operator vfn(); };
20struct G { operator vfn(); };
21
22struct Base {
23  int trick();
24  A trick() const;
25  void fn1();
26};
27struct Derived : Base {
28  void fn2();
29};
30struct Convertible { operator Base&(); };
31struct Priv : private Base {}; // expected-note 4 {{declared private here}}
32struct Mid : Base {};
33struct Fin : Mid, Derived {};
34typedef void (Derived::*DFnPtr)();
35struct ToMemPtr { operator DFnPtr(); };
36
37struct BadDerived;
38struct BadBase { operator BadDerived&(); };
39struct BadDerived : BadBase {};
40
41struct Fields {
42  int i1, i2, b1 : 3, b2 : 3;
43};
44struct MixedFields {
45  int i;
46  volatile int vi;
47  const int ci;
48  const volatile int cvi;
49};
50struct MixedFieldsDerived : MixedFields {
51};
52
53enum Enum { EVal };
54
55struct Ambig {
56  operator short(); // expected-note 2 {{candidate function}}
57  operator signed char(); // expected-note 2 {{candidate function}}
58};
59
60struct Abstract {
61  virtual ~Abstract() = 0; // expected-note {{unimplemented pure virtual method '~Abstract' in 'Abstract'}}
62};
63
64struct Derived1: Abstract {
65};
66
67struct Derived2: Abstract {
68};
69
70void test()
71{
72  // This function tests C++0x 5.16
73
74  // p1 (contextually convert to bool)
75  int i1 = ToBool() ? 0 : 1;
76
77  // p2 (one or both void, and throwing)
78  Fields flds;
79  i1 ? throw 0 : throw 1;
80  i1 ? test() : throw 1;
81  i1 ? throw 0 : test();
82  i1 ? test() : test();
83  i1 = i1 ? throw 0 : 0;
84  i1 = i1 ? 0 : throw 0;
85  i1 = i1 ? (throw 0) : 0;
86  i1 = i1 ? 0 : (throw 0);
87  i1 ? 0 : test(); // expected-error {{right operand to ? is void, but left operand is of type 'int'}}
88  i1 ? test() : 0; // expected-error {{left operand to ? is void, but right operand is of type 'int'}}
89  (i1 ? throw 0 : i1) = 0;
90  (i1 ? i1 : throw 0) = 0;
91  (i1 ? (throw 0) : i1) = 0;
92  (i1 ? i1 : (throw 0)) = 0;
93  (i1 ? (void)(throw 0) : i1) = 0; // expected-error {{left operand to ? is void, but right operand is of type 'int'}}
94  (i1 ? i1 : (void)(throw 0)) = 0; // expected-error {{right operand to ? is void, but left operand is of type 'int'}}
95  int &throwRef1 = (i1 ? flds.i1 : throw 0);
96  int &throwRef2 = (i1 ? throw 0 : flds.i1);
97  int &throwRef3 = (i1 ? flds.b1 : throw 0); // expected-error {{non-const reference cannot bind to bit-field}}
98  int &throwRef4 = (i1 ? throw 0 : flds.b1); // expected-error {{non-const reference cannot bind to bit-field}}
99
100  // p3 (one or both class type, convert to each other)
101  // b1 (lvalues)
102  Base base;
103  Derived derived;
104  Convertible conv;
105  Base &bar1 = i1 ? base : derived;
106  Base &bar2 = i1 ? derived : base;
107  Base &bar3 = i1 ? base : conv;
108  Base &bar4 = i1 ? conv : base;
109  // these are ambiguous
110  BadBase bb;
111  BadDerived bd;
112  (void)(i1 ? bb : bd); // expected-error {{conditional expression is ambiguous; 'BadBase' can be converted to 'BadDerived' and vice versa}}
113  (void)(i1 ? bd : bb); // expected-error {{conditional expression is ambiguous}}
114  // curiously enough (and a defect?), these are not
115  // for rvalues, hierarchy takes precedence over other conversions
116  (void)(i1 ? BadBase() : BadDerived());
117  (void)(i1 ? BadDerived() : BadBase());
118
119  // b2.1 (hierarchy stuff)
120  extern const Base constret();
121  extern const Derived constder();
122  // should use const overload
123  A a1((i1 ? constret() : Base()).trick());
124  A a2((i1 ? Base() : constret()).trick());
125  A a3((i1 ? constret() : Derived()).trick());
126  A a4((i1 ? Derived() : constret()).trick());
127  // should use non-const overload
128  i1 = (i1 ? Base() : Base()).trick();
129  i1 = (i1 ? Base() : Base()).trick();
130  i1 = (i1 ? Base() : Derived()).trick();
131  i1 = (i1 ? Derived() : Base()).trick();
132  // should fail: const lost
133  (void)(i1 ? Base() : constder()); // expected-error {{incompatible operand types ('Base' and 'const Derived')}}
134  (void)(i1 ? constder() : Base()); // expected-error {{incompatible operand types ('const Derived' and 'Base')}}
135
136  Priv priv;
137  Fin fin;
138  (void)(i1 ? Base() : Priv()); // expected-error{{private base class}}
139  (void)(i1 ? Priv() : Base()); // expected-error{{private base class}}
140  (void)(i1 ? Base() : Fin()); // expected-error{{ambiguous conversion from derived class 'Fin' to base class 'Base':}}
141  (void)(i1 ? Fin() : Base()); // expected-error{{ambiguous conversion from derived class 'Fin' to base class 'Base':}}
142  (void)(i1 ? base : priv); // expected-error {{private base class}}
143  (void)(i1 ? priv : base); // expected-error {{private base class}}
144  (void)(i1 ? base : fin); // expected-error {{ambiguous conversion from derived class 'Fin' to base class 'Base':}}
145  (void)(i1 ? fin : base); // expected-error {{ambiguous conversion from derived class 'Fin' to base class 'Base':}}
146
147  // b2.2 (non-hierarchy)
148  i1 = i1 ? I() : i1;
149  i1 = i1 ? i1 : I();
150  I i2(i1 ? I() : J());
151  I i3(i1 ? J() : I());
152  // "the type [it] woud have if E2 were converted to an rvalue"
153  vfn pfn = i1 ? F() : test;
154  pfn = i1 ? test : F();
155  (void)(i1 ? A() : B()); // expected-error {{conversion from 'B' to 'A' is ambiguous}}
156  (void)(i1 ? B() : A()); // expected-error {{conversion from 'B' to 'A' is ambiguous}}
157  (void)(i1 ? 1 : Ambig()); // expected-error {{conversion from 'Ambig' to 'int' is ambiguous}}
158  (void)(i1 ? Ambig() : 1); // expected-error {{conversion from 'Ambig' to 'int' is ambiguous}}
159  // By the way, this isn't an lvalue:
160  &(i1 ? i1 : i2); // expected-error {{cannot take the address of an rvalue}}
161
162  // p4 (lvalue, same type)
163  int &ir1 = i1 ? flds.i1 : flds.i2;
164  (i1 ? flds.b1 : flds.i2) = 0;
165  (i1 ? flds.i1 : flds.b2) = 0;
166  (i1 ? flds.b1 : flds.b2) = 0;
167
168  // p5 (conversion to built-in types)
169  // GCC 4.3 fails these
170  double d1 = i1 ? I() : K();
171  pfn = i1 ? F() : G();
172  DFnPtr pfm;
173  pfm = i1 ? DFnPtr() : &Base::fn1;
174  pfm = i1 ? &Base::fn1 : DFnPtr();
175
176  // p6 (final conversions)
177  i1 = i1 ? i1 : ir1;
178  int *pi1 = i1 ? &i1 : 0;
179  pi1 = i1 ? 0 : &i1;
180  i1 = i1 ? i1 : EVal;
181  i1 = i1 ? EVal : i1;
182  d1 = i1 ? 'c' : 4.0;
183  d1 = i1 ? 4.0 : 'c';
184  Base *pb = i1 ? (Base*)0 : (Derived*)0;
185  pb = i1 ? (Derived*)0 : (Base*)0;
186  pfm = i1 ? &Base::fn1 : &Derived::fn2;
187  pfm = i1 ? &Derived::fn2 : &Base::fn1;
188  pfm = i1 ? &Derived::fn2 : 0;
189  pfm = i1 ? 0 : &Derived::fn2;
190  const int (MixedFieldsDerived::*mp1) =
191    i1 ? &MixedFields::ci : &MixedFieldsDerived::i;
192  const volatile int (MixedFields::*mp2) =
193    i1 ? &MixedFields::ci : &MixedFields::cvi;
194  (void)(i1 ? &MixedFields::ci : &MixedFields::vi);
195  // Conversion of primitives does not result in an lvalue.
196  &(i1 ? i1 : d1); // expected-error {{cannot take the address of an rvalue}}
197
198  (void)&(i1 ? flds.b1 : flds.i1); // expected-error {{address of bit-field requested}}
199  (void)&(i1 ? flds.i1 : flds.b1); // expected-error {{address of bit-field requested}}
200
201
202  unsigned long test0 = 5;
203  test0 = test0 ? (long) test0 : test0; // expected-warning {{operand of ? changes signedness: 'long' to 'unsigned long'}}
204  test0 = test0 ? (int) test0 : test0; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
205  test0 = test0 ? (short) test0 : test0; // expected-warning {{operand of ? changes signedness: 'short' to 'unsigned long'}}
206  test0 = test0 ? test0 : (long) test0; // expected-warning {{operand of ? changes signedness: 'long' to 'unsigned long'}}
207  test0 = test0 ? test0 : (int) test0; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
208  test0 = test0 ? test0 : (short) test0; // expected-warning {{operand of ? changes signedness: 'short' to 'unsigned long'}}
209  test0 = test0 ? test0 : (long) 10;
210  test0 = test0 ? test0 : (int) 10;
211  test0 = test0 ? test0 : (short) 10;
212  test0 = test0 ? (long) 10 : test0;
213  test0 = test0 ? (int) 10 : test0;
214  test0 = test0 ? (short) 10 : test0;
215
216  int test1;
217  test0 = test0 ? EVal : test0;
218  test1 = test0 ? EVal : (int) test0;
219
220  test0 = test0 ? EVal : test1; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
221  test0 = test0 ? test1 : EVal; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
222
223  test1 = test0 ? EVal : (int) test0;
224  test1 = test0 ? (int) test0 : EVal;
225
226  // Note the thing that this does not test: since DR446, various situations
227  // *must* create a separate temporary copy of class objects. This can only
228  // be properly tested at runtime, though.
229
230  const Abstract &abstract1 = true ? static_cast<const Abstract&>(Derived1()) : Derived2(); // expected-error {{allocating an object of abstract class type 'const Abstract'}}
231  const Abstract &abstract2 = true ? static_cast<const Abstract&>(Derived1()) : throw 3; // ok
232}
233
234namespace PR6595 {
235  struct OtherString {
236    OtherString();
237    OtherString(const char*);
238  };
239
240  struct String {
241    String(const char *);
242    String(const OtherString&);
243    operator const char*() const;
244  };
245
246  void f(bool Cond, String S, OtherString OS) {
247    (void)(Cond? S : "");
248    (void)(Cond? "" : S);
249    const char a[1] = {'a'};
250    (void)(Cond? S : a);
251    (void)(Cond? a : S);
252    (void)(Cond? OS : S);
253  }
254}
255
256namespace PR6757 {
257  struct Foo1 {
258    Foo1();
259    Foo1(const Foo1&);
260  };
261
262  struct Foo2 { };
263
264  struct Foo3 {
265    Foo3();
266    Foo3(Foo3&); // expected-note{{would lose const qualifier}}
267  };
268
269  struct Bar {
270    operator const Foo1&() const;
271    operator const Foo2&() const;
272    operator const Foo3&() const;
273  };
274
275  void f() {
276    (void)(true ? Bar() : Foo1()); // okay
277    (void)(true ? Bar() : Foo2()); // okay
278    (void)(true ? Bar() : Foo3()); // expected-error{{no viable constructor copying temporary}}
279  }
280}
281
282// Reduced from selfhost.
283namespace test1 {
284  struct A {
285    enum Foo {
286      fa, fb, fc, fd, fe, ff
287    };
288
289    Foo x();
290  };
291
292  void foo(int);
293
294  void test(A *a) {
295    foo(a ? a->x() : 0);
296  }
297}
298
299namespace rdar7998817 {
300  class X {
301    X(X&); // expected-note{{declared private here}}
302
303    struct ref { };
304
305  public:
306    X();
307    X(ref);
308
309    operator ref();
310  };
311
312  void f(bool B) {
313    X x;
314    (void)(B? x // expected-error{{calling a private constructor of class 'rdar7998817::X'}}
315           : X());
316  }
317}
318
319namespace PR7598 {
320  enum Enum {
321    v = 1,
322  };
323
324  const Enum g() {
325    return v;
326  }
327
328  const volatile Enum g2() {
329    return v;
330  }
331
332  void f() {
333    const Enum v2 = v;
334    Enum e = false ? g() : v;
335    Enum e2 = false ? v2 : v;
336    Enum e3 = false ? g2() : v;
337  }
338
339}
340
341namespace PR9236 {
342#define NULL 0L
343  void f() {
344    int i;
345    (void)(true ? A() : NULL); // expected-error{{non-pointer operand type 'A' incompatible with NULL}}
346    (void)(true ? NULL : A()); // expected-error{{non-pointer operand type 'A' incompatible with NULL}}
347    (void)(true ? 0 : A()); // expected-error{{incompatible operand types}}
348    (void)(true ? nullptr : A()); // expected-error{{non-pointer operand type 'A' incompatible with nullptr}}
349    (void)(true ? nullptr : i); // expected-error{{non-pointer operand type 'int' incompatible with nullptr}}
350    (void)(true ? __null : A()); // expected-error{{non-pointer operand type 'A' incompatible with NULL}}
351    (void)(true ? (void*)0 : A()); // expected-error{{incompatible operand types}}
352  }
353}
354
355namespace DR587 {
356  template<typename T>
357  const T *f(bool b) {
358    static T t1 = T();
359    static const T t2 = T();
360    return &(b ? t1 : t2);
361  }
362  struct S {};
363  template const int *f(bool);
364  template const S *f(bool);
365
366  extern bool b;
367  int i = 0;
368  const int ci = 0;
369  volatile int vi = 0;
370  const volatile int cvi = 0;
371
372  const int &cir = b ? i : ci;
373  volatile int &vir = b ? vi : i;
374  const volatile int &cvir1 = b ? ci : cvi;
375  const volatile int &cvir2 = b ? cvi : vi;
376  const volatile int &cvir3 = b ? ci : vi; // expected-error{{volatile lvalue reference to type 'const volatile int' cannot bind to a temporary of type 'int'}}
377}
378
379namespace PR17052 {
380  struct X {
381    int i_;
382    bool b_;
383
384    int &test() { return b_ ? i_ : throw 1; }
385  };
386}
387