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 namespace test14 {
327   extern "C" const int foo;
328 
329   int f() {
330     return foo;
331   }
332 }
333