1 // RUN: %clang_cc1 -fsyntax-only -verify -Wbind-to-temporary-copy %s 2 // RUN: %clang_cc1 -fsyntax-only -verify -Wbind-to-temporary-copy -std=c++98 %s 3 // RUN: %clang_cc1 -fsyntax-only -verify -Wbind-to-temporary-copy -std=c++11 %s 4 5 // Make sure we don't produce invalid IR. 6 // RUN: %clang_cc1 -emit-llvm-only %s 7 // RUN: %clang_cc1 -emit-llvm-only -std=c++98 %s 8 // RUN: %clang_cc1 -emit-llvm-only -std=c++11 %s 9 10 namespace test1 { 11 static void foo(); // expected-warning {{function 'test1::foo' has internal linkage but is not defined}} 12 template <class T> static void bar(); // expected-warning {{function 'test1::bar<int>' has internal linkage but is not defined}} 13 14 void test() { 15 foo(); // expected-note {{used here}} 16 bar<int>(); // expected-note {{used here}} 17 } 18 } 19 20 namespace test2 { 21 namespace { 22 void foo(); // expected-warning {{function 'test2::(anonymous namespace)::foo' has internal linkage but is not defined}} 23 extern int var; // expected-warning {{variable 'test2::(anonymous namespace)::var' has internal linkage but is not defined}} 24 template <class T> void bar(); // expected-warning {{function 'test2::(anonymous namespace)::bar<int>' has internal linkage but is not defined}} 25 } 26 void test() { 27 foo(); // expected-note {{used here}} 28 var = 0; // expected-note {{used here}} 29 bar<int>(); // expected-note {{used here}} 30 } 31 } 32 33 namespace test3 { 34 namespace { 35 void foo(); 36 extern int var; 37 template <class T> void bar(); 38 } 39 40 void test() { 41 foo(); 42 var = 0; 43 bar<int>(); 44 } 45 46 namespace { 47 void foo() {} 48 int var = 0; 49 template <class T> void bar() {} 50 } 51 } 52 53 namespace test4 { 54 namespace { 55 struct A { 56 A(); // expected-warning {{function 'test4::(anonymous namespace)::A::A' has internal linkage but is not defined}} 57 ~A();// expected-warning {{function 'test4::(anonymous namespace)::A::~A' has internal linkage but is not defined}} 58 virtual void foo(); // expected-warning {{function 'test4::(anonymous namespace)::A::foo' has internal linkage but is not defined}} 59 virtual void bar() = 0; 60 virtual void baz(); // expected-warning {{function 'test4::(anonymous namespace)::A::baz' has internal linkage but is not defined}} 61 }; 62 } 63 64 void test(A &a) { 65 a.foo(); // expected-note {{used here}} 66 a.bar(); 67 a.baz(); // expected-note {{used here}} 68 } 69 70 struct Test : A { 71 Test() {} // expected-note 2 {{used here}} 72 }; 73 } 74 75 // rdar://problem/9014651 76 namespace test5 { 77 namespace { 78 struct A {}; 79 } 80 81 template <class N> struct B { 82 static int var; // expected-warning {{variable 'test5::B<test5::(anonymous namespace)::A>::var' has internal linkage but is not defined}} 83 static void foo(); // expected-warning {{function 'test5::B<test5::(anonymous namespace)::A>::foo' has internal linkage but is not defined}} 84 }; 85 86 void test() { 87 B<A>::var = 0; // expected-note {{used here}} 88 B<A>::foo(); // expected-note {{used here}} 89 } 90 } 91 92 namespace test6 { 93 template <class T> struct A { 94 static const int zero = 0; 95 static const int one = 1; 96 static const int two = 2; 97 98 int value; 99 100 A() : value(zero) { 101 value = one; 102 } 103 }; 104 105 namespace { struct Internal; } 106 107 void test() { 108 A<Internal> a; 109 a.value = A<Internal>::two; 110 } 111 } 112 113 // We support (as an extension) private, undefined copy constructors when 114 // a temporary is bound to a reference even in C++98. Similarly, we shouldn't 115 // warn about this copy constructor being used without a definition. 116 namespace PR9323 { 117 namespace { 118 struct Uncopyable { 119 Uncopyable() {} 120 private: 121 Uncopyable(const Uncopyable&); // expected-note {{declared private here}} 122 }; 123 } 124 void f(const Uncopyable&) {} 125 void test() { 126 f(Uncopyable()); 127 #if __cplusplus <= 199711L // C++03 or earlier modes 128 // expected-warning@-2 {{C++98 requires an accessible copy constructor}} 129 #else 130 // expected-warning@-4 {{copying parameter of type 'PR9323::(anonymous namespace)::Uncopyable' when binding a reference to a temporary would invoke an inaccessible constructor in C++98}} 131 #endif 132 }; 133 } 134 135 136 namespace std { class type_info; }; 137 namespace cxx11_odr_rules { 138 // Note: the way this test is written isn't really ideal, but there really 139 // isn't any other way to check that the odr-used logic for constants 140 // is working without working implicit capture in lambda-expressions. 141 // (The more accurate used-but-not-defined warning is the only other visible 142 // effect of accurate odr-used computation.) 143 // 144 // Note that the warning in question can trigger in cases some people would 145 // consider false positives; hopefully that happens rarely in practice. 146 // 147 // FIXME: Suppressing this test while I figure out how to fix a bug in the 148 // odr-use marking code. 149 150 namespace { 151 struct A { 152 static const int unused = 10; 153 static const int used1 = 20; // xpected-warning {{internal linkage}} 154 static const int used2 = 20; // xpected-warning {{internal linkage}} 155 virtual ~A() {} 156 }; 157 } 158 159 void a(int,int); 160 A& p(const int&) { static A a; return a; } 161 162 // Check handling of default arguments 163 void b(int = A::unused); 164 165 void tests() { 166 // Basic test 167 a(A::unused, A::unused); 168 169 // Check that nesting an unevaluated or constant-evaluated context does 170 // the right thing. 171 a(A::unused, sizeof(int[10])); 172 173 // Check that the checks work with unevaluated contexts 174 (void)sizeof(p(A::used1)); 175 (void)typeid(p(A::used1)); // expected-warning {{expression with side effects will be evaluated despite being used as an operand to 'typeid'}} xpected-note {{used here}} 176 177 // Misc other testing 178 a(A::unused, 1 ? A::used2 : A::used2); // xpected-note {{used here}} 179 b(); 180 } 181 } 182 183 184 namespace OverloadUse { 185 namespace { 186 void f(); 187 void f(int); // expected-warning {{function 'OverloadUse::(anonymous namespace)::f' has internal linkage but is not defined}} 188 } 189 template<void x()> void t(int*) { x(); } 190 template<void x(int)> void t(long*) { x(10); } // expected-note {{used here}} 191 void g() { long a; t<f>(&a); } 192 } 193 194 namespace test7 { 195 typedef struct { 196 void bar(); 197 void foo() { 198 bar(); 199 } 200 } A; 201 } 202 203 namespace test8 { 204 typedef struct { 205 void bar(); // expected-warning {{function 'test8::(anonymous struct)::bar' has internal linkage but is not defined}} 206 void foo() { 207 bar(); // expected-note {{used here}} 208 } 209 } *A; 210 } 211 212 namespace test9 { 213 namespace { 214 struct X { 215 virtual void notused() = 0; 216 virtual void used() = 0; // expected-warning {{function 'test9::(anonymous namespace)::X::used' has internal linkage but is not defined}} 217 }; 218 } 219 void test(X &x) { 220 x.notused(); 221 x.X::used(); // expected-note {{used here}} 222 } 223 } 224 225 namespace test10 { 226 namespace { 227 struct X { 228 virtual void notused() = 0; 229 virtual void used() = 0; // expected-warning {{function 'test10::(anonymous namespace)::X::used' has internal linkage but is not defined}} 230 231 void test() { 232 notused(); 233 (void)&X::notused; 234 (this->*&X::notused)(); 235 X::used(); // expected-note {{used here}} 236 } 237 }; 238 struct Y : X { 239 using X::notused; 240 }; 241 } 242 } 243 244 namespace test11 { 245 namespace { 246 struct A { 247 virtual bool operator()() const = 0; 248 virtual void operator!() const = 0; 249 virtual bool operator+(const A&) const = 0; 250 virtual int operator[](int) const = 0; 251 virtual const A* operator->() const = 0; 252 int member; 253 }; 254 255 struct B { 256 bool operator()() const; // expected-warning {{function 'test11::(anonymous namespace)::B::operator()' has internal linkage but is not defined}} 257 void operator!() const; // expected-warning {{function 'test11::(anonymous namespace)::B::operator!' has internal linkage but is not defined}} 258 bool operator+(const B&) const; // expected-warning {{function 'test11::(anonymous namespace)::B::operator+' has internal linkage but is not defined}} 259 int operator[](int) const; // expected-warning {{function 'test11::(anonymous namespace)::B::operator[]' has internal linkage but is not defined}} 260 const B* operator->() const; // expected-warning {{function 'test11::(anonymous namespace)::B::operator->' has internal linkage but is not defined}} 261 int member; 262 }; 263 } 264 265 void test1(A &a1, A &a2) { 266 a1(); 267 !a1; 268 a1 + a2; 269 a1[0]; 270 (void)a1->member; 271 } 272 273 void test2(B &b1, B &b2) { 274 b1(); // expected-note {{used here}} 275 !b1; // expected-note {{used here}} 276 b1 + b2; // expected-note {{used here}} 277 b1[0]; // expected-note {{used here}} 278 (void)b1->member; // expected-note {{used here}} 279 } 280 } 281 282 namespace test12 { 283 class T1 {}; class T2 {}; class T3 {}; class T4 {}; class T5 {}; class T6 {}; 284 class T7 {}; 285 286 namespace { 287 struct Cls { 288 virtual void f(int) = 0; 289 virtual void f(int, double) = 0; 290 void g(int); // expected-warning {{function 'test12::(anonymous namespace)::Cls::g' has internal linkage but is not defined}} 291 void g(int, double); 292 virtual operator T1() = 0; 293 virtual operator T2() = 0; 294 virtual operator T3&() = 0; 295 operator T4(); // expected-warning {{function 'test12::(anonymous namespace)::Cls::operator T4' has internal linkage but is not defined}} 296 operator T5(); // expected-warning {{function 'test12::(anonymous namespace)::Cls::operator T5' has internal linkage but is not defined}} 297 operator T6&(); // expected-warning {{function 'test12::(anonymous namespace)::Cls::operator test12::T6 &' has internal linkage but is not defined}} 298 }; 299 300 struct Cls2 { 301 Cls2(T7); // expected-warning {{function 'test12::(anonymous namespace)::Cls2::Cls2' has internal linkage but is not defined}} 302 }; 303 } 304 305 void test(Cls &c) { 306 c.f(7); 307 c.g(7); // expected-note {{used here}} 308 (void)static_cast<T1>(c); 309 T2 t2 = c; 310 T3 &t3 = c; 311 (void)static_cast<T4>(c); // expected-note {{used here}} 312 T5 t5 = c; // expected-note {{used here}} 313 T6 &t6 = c; // expected-note {{used here}} 314 315 Cls2 obj1((T7())); // expected-note {{used here}} 316 } 317 } 318 319 namespace test13 { 320 namespace { 321 struct X { 322 virtual void f() { } 323 }; 324 325 struct Y : public X { 326 virtual void f() = 0; 327 328 virtual void g() { 329 X::f(); 330 } 331 }; 332 } 333 } 334 335 namespace test14 { 336 extern "C" const int foo; 337 338 int f() { 339 return foo; 340 } 341 } 342
