369 lines
12 KiB
C++
369 lines
12 KiB
C++
// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -fsyntax-only -verify -std=c++11 -Wsign-conversion %s
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// C++ rules for ?: are a lot stricter than C rules, and have to take into
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// account more conversion options.
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// This test runs in C++11 mode for the contextual conversion of the condition.
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struct ToBool { explicit operator bool(); };
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struct B;
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struct A {
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A();
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A(const B&); // expected-note 2 {{candidate constructor}}
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};
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struct B { operator A() const; }; // expected-note 2 {{candidate function}}
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struct I { operator int(); };
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struct J { operator I(); };
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struct K { operator double(); };
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typedef void (*vfn)();
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struct F { operator vfn(); };
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struct G { operator vfn(); };
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struct Base {
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int trick();
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A trick() const;
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void fn1();
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};
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struct Derived : Base {
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void fn2();
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};
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struct Convertible { operator Base&(); };
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struct Priv : private Base {}; // expected-note 4 {{declared private here}}
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struct Mid : Base {};
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struct Fin : Mid, Derived {};
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typedef void (Derived::*DFnPtr)();
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struct ToMemPtr { operator DFnPtr(); };
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struct BadDerived;
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struct BadBase { operator BadDerived&(); };
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struct BadDerived : BadBase {};
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struct Fields {
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int i1, i2, b1 : 3, b2 : 3;
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};
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struct MixedFields {
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int i;
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volatile int vi;
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const int ci;
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const volatile int cvi;
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};
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struct MixedFieldsDerived : MixedFields {
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};
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enum Enum { EVal };
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struct Ambig {
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operator short(); // expected-note 2 {{candidate function}}
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operator signed char(); // expected-note 2 {{candidate function}}
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};
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struct Abstract {
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virtual ~Abstract() = 0; // expected-note {{unimplemented pure virtual method '~Abstract' in 'Abstract'}}
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};
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struct Derived1: Abstract {
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};
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struct Derived2: Abstract {
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};
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void test()
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{
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// This function tests C++0x 5.16
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// p1 (contextually convert to bool)
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int i1 = ToBool() ? 0 : 1;
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// p2 (one or both void, and throwing)
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i1 ? throw 0 : throw 1;
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i1 ? test() : throw 1;
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i1 ? throw 0 : test();
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i1 ? test() : test();
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i1 = i1 ? throw 0 : 0;
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i1 = i1 ? 0 : throw 0;
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i1 = i1 ? (throw 0) : 0;
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i1 = i1 ? 0 : (throw 0);
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i1 ? 0 : test(); // expected-error {{right operand to ? is void, but left operand is of type 'int'}}
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i1 ? test() : 0; // expected-error {{left operand to ? is void, but right operand is of type 'int'}}
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(i1 ? throw 0 : i1) = 0; // expected-error {{expression is not assignable}}
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(i1 ? i1 : throw 0) = 0; // expected-error {{expression is not assignable}}
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// p3 (one or both class type, convert to each other)
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// b1 (lvalues)
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Base base;
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Derived derived;
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Convertible conv;
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Base &bar1 = i1 ? base : derived;
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Base &bar2 = i1 ? derived : base;
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Base &bar3 = i1 ? base : conv;
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Base &bar4 = i1 ? conv : base;
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// these are ambiguous
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BadBase bb;
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BadDerived bd;
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(void)(i1 ? bb : bd); // expected-error {{conditional expression is ambiguous; 'BadBase' can be converted to 'BadDerived' and vice versa}}
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(void)(i1 ? bd : bb); // expected-error {{conditional expression is ambiguous}}
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// curiously enough (and a defect?), these are not
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// for rvalues, hierarchy takes precedence over other conversions
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(void)(i1 ? BadBase() : BadDerived());
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(void)(i1 ? BadDerived() : BadBase());
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// b2.1 (hierarchy stuff)
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extern const Base constret();
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extern const Derived constder();
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// should use const overload
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A a1((i1 ? constret() : Base()).trick());
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A a2((i1 ? Base() : constret()).trick());
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A a3((i1 ? constret() : Derived()).trick());
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A a4((i1 ? Derived() : constret()).trick());
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// should use non-const overload
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i1 = (i1 ? Base() : Base()).trick();
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i1 = (i1 ? Base() : Base()).trick();
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i1 = (i1 ? Base() : Derived()).trick();
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i1 = (i1 ? Derived() : Base()).trick();
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// should fail: const lost
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(void)(i1 ? Base() : constder()); // expected-error {{incompatible operand types ('Base' and 'const Derived')}}
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(void)(i1 ? constder() : Base()); // expected-error {{incompatible operand types ('const Derived' and 'Base')}}
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Priv priv;
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Fin fin;
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(void)(i1 ? Base() : Priv()); // expected-error{{private base class}}
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(void)(i1 ? Priv() : Base()); // expected-error{{private base class}}
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(void)(i1 ? Base() : Fin()); // expected-error{{ambiguous conversion from derived class 'Fin' to base class 'Base':}}
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(void)(i1 ? Fin() : Base()); // expected-error{{ambiguous conversion from derived class 'Fin' to base class 'Base':}}
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(void)(i1 ? base : priv); // expected-error {{private base class}}
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(void)(i1 ? priv : base); // expected-error {{private base class}}
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(void)(i1 ? base : fin); // expected-error {{ambiguous conversion from derived class 'Fin' to base class 'Base':}}
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(void)(i1 ? fin : base); // expected-error {{ambiguous conversion from derived class 'Fin' to base class 'Base':}}
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// b2.2 (non-hierarchy)
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i1 = i1 ? I() : i1;
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i1 = i1 ? i1 : I();
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I i2(i1 ? I() : J());
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I i3(i1 ? J() : I());
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// "the type [it] woud have if E2 were converted to an rvalue"
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vfn pfn = i1 ? F() : test;
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pfn = i1 ? test : F();
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(void)(i1 ? A() : B()); // expected-error {{conversion from 'B' to 'A' is ambiguous}}
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(void)(i1 ? B() : A()); // expected-error {{conversion from 'B' to 'A' is ambiguous}}
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(void)(i1 ? 1 : Ambig()); // expected-error {{conversion from 'Ambig' to 'int' is ambiguous}}
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(void)(i1 ? Ambig() : 1); // expected-error {{conversion from 'Ambig' to 'int' is ambiguous}}
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// By the way, this isn't an lvalue:
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&(i1 ? i1 : i2); // expected-error {{cannot take the address of an rvalue}}
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// p4 (lvalue, same type)
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Fields flds;
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int &ir1 = i1 ? flds.i1 : flds.i2;
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(i1 ? flds.b1 : flds.i2) = 0;
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(i1 ? flds.i1 : flds.b2) = 0;
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(i1 ? flds.b1 : flds.b2) = 0;
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// p5 (conversion to built-in types)
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// GCC 4.3 fails these
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double d1 = i1 ? I() : K();
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pfn = i1 ? F() : G();
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DFnPtr pfm;
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pfm = i1 ? DFnPtr() : &Base::fn1;
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pfm = i1 ? &Base::fn1 : DFnPtr();
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// p6 (final conversions)
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i1 = i1 ? i1 : ir1;
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int *pi1 = i1 ? &i1 : 0;
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pi1 = i1 ? 0 : &i1;
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i1 = i1 ? i1 : EVal;
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i1 = i1 ? EVal : i1;
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d1 = i1 ? 'c' : 4.0;
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d1 = i1 ? 4.0 : 'c';
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Base *pb = i1 ? (Base*)0 : (Derived*)0;
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pb = i1 ? (Derived*)0 : (Base*)0;
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pfm = i1 ? &Base::fn1 : &Derived::fn2;
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pfm = i1 ? &Derived::fn2 : &Base::fn1;
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pfm = i1 ? &Derived::fn2 : 0;
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pfm = i1 ? 0 : &Derived::fn2;
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const int (MixedFieldsDerived::*mp1) =
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i1 ? &MixedFields::ci : &MixedFieldsDerived::i;
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const volatile int (MixedFields::*mp2) =
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i1 ? &MixedFields::ci : &MixedFields::cvi;
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(void)(i1 ? &MixedFields::ci : &MixedFields::vi);
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// Conversion of primitives does not result in an lvalue.
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&(i1 ? i1 : d1); // expected-error {{cannot take the address of an rvalue}}
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(void)&(i1 ? flds.b1 : flds.i1); // expected-error {{address of bit-field requested}}
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(void)&(i1 ? flds.i1 : flds.b1); // expected-error {{address of bit-field requested}}
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unsigned long test0 = 5;
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test0 = test0 ? (long) test0 : test0; // expected-warning {{operand of ? changes signedness: 'long' to 'unsigned long'}}
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test0 = test0 ? (int) test0 : test0; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
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test0 = test0 ? (short) test0 : test0; // expected-warning {{operand of ? changes signedness: 'short' to 'unsigned long'}}
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test0 = test0 ? test0 : (long) test0; // expected-warning {{operand of ? changes signedness: 'long' to 'unsigned long'}}
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test0 = test0 ? test0 : (int) test0; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
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test0 = test0 ? test0 : (short) test0; // expected-warning {{operand of ? changes signedness: 'short' to 'unsigned long'}}
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test0 = test0 ? test0 : (long) 10;
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test0 = test0 ? test0 : (int) 10;
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test0 = test0 ? test0 : (short) 10;
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test0 = test0 ? (long) 10 : test0;
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test0 = test0 ? (int) 10 : test0;
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test0 = test0 ? (short) 10 : test0;
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int test1;
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test0 = test0 ? EVal : test0;
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test1 = test0 ? EVal : (int) test0;
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test0 = test0 ? EVal : test1; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
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test0 = test0 ? test1 : EVal; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
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test1 = test0 ? EVal : (int) test0;
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test1 = test0 ? (int) test0 : EVal;
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// Note the thing that this does not test: since DR446, various situations
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// *must* create a separate temporary copy of class objects. This can only
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// be properly tested at runtime, though.
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const Abstract &a = true ? static_cast<const Abstract&>(Derived1()) : Derived2(); // expected-error {{allocating an object of abstract class type 'const Abstract'}}
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true ? static_cast<const Abstract&>(Derived1()) : throw 3; // expected-error {{allocating an object of abstract class type 'const Abstract'}}
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}
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namespace PR6595 {
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struct OtherString {
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OtherString();
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OtherString(const char*);
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};
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struct String {
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String(const char *);
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String(const OtherString&);
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operator const char*() const;
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};
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void f(bool Cond, String S, OtherString OS) {
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(void)(Cond? S : "");
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(void)(Cond? "" : S);
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const char a[1] = {'a'};
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(void)(Cond? S : a);
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(void)(Cond? a : S);
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(void)(Cond? OS : S);
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}
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}
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namespace PR6757 {
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struct Foo1 {
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Foo1();
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Foo1(const Foo1&);
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};
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struct Foo2 { };
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struct Foo3 {
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Foo3();
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Foo3(Foo3&); // expected-note{{would lose const qualifier}}
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};
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struct Bar {
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operator const Foo1&() const;
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operator const Foo2&() const;
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operator const Foo3&() const;
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};
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void f() {
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(void)(true ? Bar() : Foo1()); // okay
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(void)(true ? Bar() : Foo2()); // okay
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(void)(true ? Bar() : Foo3()); // expected-error{{no viable constructor copying temporary}}
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}
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}
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// Reduced from selfhost.
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namespace test1 {
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struct A {
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enum Foo {
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fa, fb, fc, fd, fe, ff
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};
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Foo x();
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};
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void foo(int);
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void test(A *a) {
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foo(a ? a->x() : 0);
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}
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}
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namespace rdar7998817 {
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class X {
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X(X&); // expected-note{{declared private here}}
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struct ref { };
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public:
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X();
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X(ref);
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operator ref();
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};
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void f(bool B) {
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X x;
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(void)(B? x // expected-error{{calling a private constructor of class 'rdar7998817::X'}}
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: X());
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}
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}
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namespace PR7598 {
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enum Enum {
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v = 1,
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};
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const Enum g() {
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return v;
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}
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const volatile Enum g2() {
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return v;
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}
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void f() {
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const Enum v2 = v;
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Enum e = false ? g() : v;
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Enum e2 = false ? v2 : v;
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Enum e3 = false ? g2() : v;
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}
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}
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namespace PR9236 {
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#define NULL 0L
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void f() {
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int i;
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(void)(true ? A() : NULL); // expected-error{{non-pointer operand type 'A' incompatible with NULL}}
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(void)(true ? NULL : A()); // expected-error{{non-pointer operand type 'A' incompatible with NULL}}
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(void)(true ? 0 : A()); // expected-error{{incompatible operand types}}
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(void)(true ? nullptr : A()); // expected-error{{non-pointer operand type 'A' incompatible with nullptr}}
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(void)(true ? nullptr : i); // expected-error{{non-pointer operand type 'int' incompatible with nullptr}}
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(void)(true ? __null : A()); // expected-error{{non-pointer operand type 'A' incompatible with NULL}}
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(void)(true ? (void*)0 : A()); // expected-error{{incompatible operand types}}
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}
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}
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namespace DR587 {
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template<typename T>
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const T *f(bool b) {
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static T t1 = T();
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static const T t2 = T();
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return &(b ? t1 : t2);
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}
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struct S {};
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template const int *f(bool);
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template const S *f(bool);
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extern bool b;
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int i = 0;
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const int ci = 0;
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volatile int vi = 0;
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const volatile int cvi = 0;
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const int &cir = b ? i : ci;
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volatile int &vir = b ? vi : i;
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const volatile int &cvir1 = b ? ci : cvi;
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const volatile int &cvir2 = b ? cvi : vi;
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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'}}
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}
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