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