xref: /aosp_15_r20/external/clang/test/SemaCXX/undefined-internal.cpp (revision 67e74705e28f6214e480b399dd47ea732279e315)
1*67e74705SXin Li // RUN: %clang_cc1 -fsyntax-only -verify -Wbind-to-temporary-copy %s
2*67e74705SXin Li // RUN: %clang_cc1 -fsyntax-only -verify -Wbind-to-temporary-copy -std=c++98 %s
3*67e74705SXin Li // RUN: %clang_cc1 -fsyntax-only -verify -Wbind-to-temporary-copy -std=c++11 %s
4*67e74705SXin Li 
5*67e74705SXin Li // Make sure we don't produce invalid IR.
6*67e74705SXin Li // RUN: %clang_cc1 -emit-llvm-only %s
7*67e74705SXin Li // RUN: %clang_cc1 -emit-llvm-only -std=c++98 %s
8*67e74705SXin Li // RUN: %clang_cc1 -emit-llvm-only -std=c++11 %s
9*67e74705SXin Li 
10*67e74705SXin Li namespace test1 {
11*67e74705SXin Li   static void foo(); // expected-warning {{function 'test1::foo' has internal linkage but is not defined}}
12*67e74705SXin Li   template <class T> static void bar(); // expected-warning {{function 'test1::bar<int>' has internal linkage but is not defined}}
13*67e74705SXin Li 
test()14*67e74705SXin Li   void test() {
15*67e74705SXin Li     foo(); // expected-note {{used here}}
16*67e74705SXin Li     bar<int>(); // expected-note {{used here}}
17*67e74705SXin Li   }
18*67e74705SXin Li }
19*67e74705SXin Li 
20*67e74705SXin Li namespace test2 {
21*67e74705SXin Li   namespace {
22*67e74705SXin Li     void foo(); // expected-warning {{function 'test2::(anonymous namespace)::foo' has internal linkage but is not defined}}
23*67e74705SXin Li     extern int var; // expected-warning {{variable 'test2::(anonymous namespace)::var' has internal linkage but is not defined}}
24*67e74705SXin Li     template <class T> void bar(); // expected-warning {{function 'test2::(anonymous namespace)::bar<int>' has internal linkage but is not defined}}
25*67e74705SXin Li   }
test()26*67e74705SXin Li   void test() {
27*67e74705SXin Li     foo(); // expected-note {{used here}}
28*67e74705SXin Li     var = 0; // expected-note {{used here}}
29*67e74705SXin Li     bar<int>(); // expected-note {{used here}}
30*67e74705SXin Li   }
31*67e74705SXin Li }
32*67e74705SXin Li 
33*67e74705SXin Li namespace test3 {
34*67e74705SXin Li   namespace {
35*67e74705SXin Li     void foo();
36*67e74705SXin Li     extern int var;
37*67e74705SXin Li     template <class T> void bar();
38*67e74705SXin Li   }
39*67e74705SXin Li 
test()40*67e74705SXin Li   void test() {
41*67e74705SXin Li     foo();
42*67e74705SXin Li     var = 0;
43*67e74705SXin Li     bar<int>();
44*67e74705SXin Li   }
45*67e74705SXin Li 
46*67e74705SXin Li   namespace {
foo()47*67e74705SXin Li     void foo() {}
48*67e74705SXin Li     int var = 0;
bar()49*67e74705SXin Li     template <class T> void bar() {}
50*67e74705SXin Li   }
51*67e74705SXin Li }
52*67e74705SXin Li 
53*67e74705SXin Li namespace test4 {
54*67e74705SXin Li   namespace {
55*67e74705SXin Li     struct A {
56*67e74705SXin Li       A(); // expected-warning {{function 'test4::(anonymous namespace)::A::A' has internal linkage but is not defined}}
57*67e74705SXin Li       ~A();// expected-warning {{function 'test4::(anonymous namespace)::A::~A' has internal linkage but is not defined}}
58*67e74705SXin Li       virtual void foo(); // expected-warning {{function 'test4::(anonymous namespace)::A::foo' has internal linkage but is not defined}}
59*67e74705SXin Li       virtual void bar() = 0;
60*67e74705SXin Li       virtual void baz(); // expected-warning {{function 'test4::(anonymous namespace)::A::baz' has internal linkage but is not defined}}
61*67e74705SXin Li     };
62*67e74705SXin Li   }
63*67e74705SXin Li 
test(A & a)64*67e74705SXin Li   void test(A &a) {
65*67e74705SXin Li     a.foo(); // expected-note {{used here}}
66*67e74705SXin Li     a.bar();
67*67e74705SXin Li     a.baz(); // expected-note {{used here}}
68*67e74705SXin Li   }
69*67e74705SXin Li 
70*67e74705SXin Li   struct Test : A {
Testtest4::Test71*67e74705SXin Li     Test() {} // expected-note 2 {{used here}}
72*67e74705SXin Li   };
73*67e74705SXin Li }
74*67e74705SXin Li 
75*67e74705SXin Li // rdar://problem/9014651
76*67e74705SXin Li namespace test5 {
77*67e74705SXin Li   namespace {
78*67e74705SXin Li     struct A {};
79*67e74705SXin Li   }
80*67e74705SXin Li 
81*67e74705SXin Li   template <class N> struct B {
82*67e74705SXin Li     static int var; // expected-warning {{variable 'test5::B<test5::(anonymous namespace)::A>::var' has internal linkage but is not defined}}
83*67e74705SXin Li     static void foo(); // expected-warning {{function 'test5::B<test5::(anonymous namespace)::A>::foo' has internal linkage but is not defined}}
84*67e74705SXin Li   };
85*67e74705SXin Li   extern template int B<A>::var;
86*67e74705SXin Li 
test()87*67e74705SXin Li   void test() {
88*67e74705SXin Li     B<A>::var = 0; // expected-note {{used here}}
89*67e74705SXin Li     B<A>::foo(); // expected-note {{used here}}
90*67e74705SXin Li   }
91*67e74705SXin Li }
92*67e74705SXin Li 
93*67e74705SXin Li namespace test6 {
94*67e74705SXin Li   template <class T> struct A {
95*67e74705SXin Li     static const int zero = 0;
96*67e74705SXin Li     static const int one = 1;
97*67e74705SXin Li     static const int two = 2;
98*67e74705SXin Li 
99*67e74705SXin Li     int value;
100*67e74705SXin Li 
Atest6::A101*67e74705SXin Li     A() : value(zero) {
102*67e74705SXin Li       value = one;
103*67e74705SXin Li     }
104*67e74705SXin Li   };
105*67e74705SXin Li 
106*67e74705SXin Li   namespace { struct Internal; }
107*67e74705SXin Li 
test()108*67e74705SXin Li   void test() {
109*67e74705SXin Li     A<Internal> a;
110*67e74705SXin Li     a.value = A<Internal>::two;
111*67e74705SXin Li   }
112*67e74705SXin Li }
113*67e74705SXin Li 
114*67e74705SXin Li // We support (as an extension) private, undefined copy constructors when
115*67e74705SXin Li // a temporary is bound to a reference even in C++98. Similarly, we shouldn't
116*67e74705SXin Li // warn about this copy constructor being used without a definition.
117*67e74705SXin Li namespace PR9323 {
118*67e74705SXin Li   namespace {
119*67e74705SXin Li     struct Uncopyable {
UncopyablePR9323::__anon28cc8d9f0711::Uncopyable120*67e74705SXin Li       Uncopyable() {}
121*67e74705SXin Li     private:
122*67e74705SXin Li       Uncopyable(const Uncopyable&); // expected-note {{declared private here}}
123*67e74705SXin Li     };
124*67e74705SXin Li   }
f(const Uncopyable &)125*67e74705SXin Li   void f(const Uncopyable&) {}
test()126*67e74705SXin Li   void test() {
127*67e74705SXin Li     f(Uncopyable());
128*67e74705SXin Li #if __cplusplus <= 199711L // C++03 or earlier modes
129*67e74705SXin Li     // expected-warning@-2 {{C++98 requires an accessible copy constructor}}
130*67e74705SXin Li #else
131*67e74705SXin Li     // 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}}
132*67e74705SXin Li #endif
133*67e74705SXin Li   };
134*67e74705SXin Li }
135*67e74705SXin Li 
136*67e74705SXin Li 
137*67e74705SXin Li namespace std { class type_info; };
138*67e74705SXin Li namespace cxx11_odr_rules {
139*67e74705SXin Li   // Note: the way this test is written isn't really ideal, but there really
140*67e74705SXin Li   // isn't any other way to check that the odr-used logic for constants
141*67e74705SXin Li   // is working without working implicit capture in lambda-expressions.
142*67e74705SXin Li   // (The more accurate used-but-not-defined warning is the only other visible
143*67e74705SXin Li   // effect of accurate odr-used computation.)
144*67e74705SXin Li   //
145*67e74705SXin Li   // Note that the warning in question can trigger in cases some people would
146*67e74705SXin Li   // consider false positives; hopefully that happens rarely in practice.
147*67e74705SXin Li   //
148*67e74705SXin Li   // FIXME: Suppressing this test while I figure out how to fix a bug in the
149*67e74705SXin Li   // odr-use marking code.
150*67e74705SXin Li 
151*67e74705SXin Li   namespace {
152*67e74705SXin Li     struct A {
153*67e74705SXin Li       static const int unused = 10;
154*67e74705SXin Li       static const int used1 = 20; // xpected-warning {{internal linkage}}
155*67e74705SXin Li       static const int used2 = 20; // xpected-warning {{internal linkage}}
~Acxx11_odr_rules::__anon28cc8d9f0811::A156*67e74705SXin Li       virtual ~A() {}
157*67e74705SXin Li     };
158*67e74705SXin Li   }
159*67e74705SXin Li 
160*67e74705SXin Li   void a(int,int);
p(const int &)161*67e74705SXin Li   A& p(const int&) { static A a; return a; }
162*67e74705SXin Li 
163*67e74705SXin Li   // Check handling of default arguments
164*67e74705SXin Li   void b(int = A::unused);
165*67e74705SXin Li 
tests()166*67e74705SXin Li   void tests() {
167*67e74705SXin Li     // Basic test
168*67e74705SXin Li     a(A::unused, A::unused);
169*67e74705SXin Li 
170*67e74705SXin Li     // Check that nesting an unevaluated or constant-evaluated context does
171*67e74705SXin Li     // the right thing.
172*67e74705SXin Li     a(A::unused, sizeof(int[10]));
173*67e74705SXin Li 
174*67e74705SXin Li     // Check that the checks work with unevaluated contexts
175*67e74705SXin Li     (void)sizeof(p(A::used1));
176*67e74705SXin Li     (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}}
177*67e74705SXin Li 
178*67e74705SXin Li     // Misc other testing
179*67e74705SXin Li     a(A::unused, 1 ? A::used2 : A::used2); // xpected-note {{used here}}
180*67e74705SXin Li     b();
181*67e74705SXin Li   }
182*67e74705SXin Li }
183*67e74705SXin Li 
184*67e74705SXin Li 
185*67e74705SXin Li namespace OverloadUse {
186*67e74705SXin Li   namespace {
187*67e74705SXin Li     void f();
188*67e74705SXin Li     void f(int); // expected-warning {{function 'OverloadUse::(anonymous namespace)::f' has internal linkage but is not defined}}
189*67e74705SXin Li   }
t(int *)190*67e74705SXin Li   template<void x()> void t(int*) { x(); }
t(long *)191*67e74705SXin Li   template<void x(int)> void t(long*) { x(10); } // expected-note {{used here}}
g()192*67e74705SXin Li   void g() { long a; t<f>(&a); }
193*67e74705SXin Li }
194*67e74705SXin Li 
195*67e74705SXin Li namespace test7 {
196*67e74705SXin Li   typedef struct {
197*67e74705SXin Li     void bar();
footest7::__anon28cc8d9f0a08198*67e74705SXin Li     void foo() {
199*67e74705SXin Li       bar();
200*67e74705SXin Li     }
201*67e74705SXin Li   } A;
202*67e74705SXin Li }
203*67e74705SXin Li 
204*67e74705SXin Li namespace test8 {
205*67e74705SXin Li   typedef struct {
206*67e74705SXin Li     void bar(); // expected-warning {{function 'test8::(anonymous struct)::bar' has internal linkage but is not defined}}
footest8::__anon28cc8d9f0b08207*67e74705SXin Li     void foo() {
208*67e74705SXin Li       bar(); // expected-note {{used here}}
209*67e74705SXin Li     }
210*67e74705SXin Li   } *A;
211*67e74705SXin Li }
212*67e74705SXin Li 
213*67e74705SXin Li namespace test9 {
214*67e74705SXin Li   namespace {
215*67e74705SXin Li     struct X {
216*67e74705SXin Li       virtual void notused() = 0;
217*67e74705SXin Li       virtual void used() = 0; // expected-warning {{function 'test9::(anonymous namespace)::X::used' has internal linkage but is not defined}}
218*67e74705SXin Li     };
219*67e74705SXin Li   }
test(X & x)220*67e74705SXin Li   void test(X &x) {
221*67e74705SXin Li     x.notused();
222*67e74705SXin Li     x.X::used(); // expected-note {{used here}}
223*67e74705SXin Li   }
224*67e74705SXin Li }
225*67e74705SXin Li 
226*67e74705SXin Li namespace test10 {
227*67e74705SXin Li   namespace {
228*67e74705SXin Li     struct X {
229*67e74705SXin Li       virtual void notused() = 0;
230*67e74705SXin Li       virtual void used() = 0; // expected-warning {{function 'test10::(anonymous namespace)::X::used' has internal linkage but is not defined}}
231*67e74705SXin Li 
testtest10::__anon28cc8d9f0d11::X232*67e74705SXin Li       void test() {
233*67e74705SXin Li         notused();
234*67e74705SXin Li         (void)&X::notused;
235*67e74705SXin Li         (this->*&X::notused)();
236*67e74705SXin Li         X::used();  // expected-note {{used here}}
237*67e74705SXin Li       }
238*67e74705SXin Li     };
239*67e74705SXin Li     struct Y : X {
240*67e74705SXin Li       using X::notused;
241*67e74705SXin Li     };
242*67e74705SXin Li   }
243*67e74705SXin Li }
244*67e74705SXin Li 
245*67e74705SXin Li namespace test11 {
246*67e74705SXin Li   namespace {
247*67e74705SXin Li     struct A {
248*67e74705SXin Li       virtual bool operator()() const = 0;
249*67e74705SXin Li       virtual void operator!() const = 0;
250*67e74705SXin Li       virtual bool operator+(const A&) const = 0;
251*67e74705SXin Li       virtual int operator[](int) const = 0;
252*67e74705SXin Li       virtual const A* operator->() const = 0;
253*67e74705SXin Li       int member;
254*67e74705SXin Li     };
255*67e74705SXin Li 
256*67e74705SXin Li     struct B {
257*67e74705SXin Li       bool operator()() const;  // expected-warning {{function 'test11::(anonymous namespace)::B::operator()' has internal linkage but is not defined}}
258*67e74705SXin Li       void operator!() const;  // expected-warning {{function 'test11::(anonymous namespace)::B::operator!' has internal linkage but is not defined}}
259*67e74705SXin Li       bool operator+(const B&) const;  // expected-warning {{function 'test11::(anonymous namespace)::B::operator+' has internal linkage but is not defined}}
260*67e74705SXin Li       int operator[](int) const;  // expected-warning {{function 'test11::(anonymous namespace)::B::operator[]' has internal linkage but is not defined}}
261*67e74705SXin Li       const B* operator->() const;  // expected-warning {{function 'test11::(anonymous namespace)::B::operator->' has internal linkage but is not defined}}
262*67e74705SXin Li       int member;
263*67e74705SXin Li     };
264*67e74705SXin Li   }
265*67e74705SXin Li 
test1(A & a1,A & a2)266*67e74705SXin Li   void test1(A &a1, A &a2) {
267*67e74705SXin Li     a1();
268*67e74705SXin Li     !a1;
269*67e74705SXin Li     a1 + a2;
270*67e74705SXin Li     a1[0];
271*67e74705SXin Li     (void)a1->member;
272*67e74705SXin Li   }
273*67e74705SXin Li 
test2(B & b1,B & b2)274*67e74705SXin Li   void test2(B &b1, B &b2) {
275*67e74705SXin Li     b1();  // expected-note {{used here}}
276*67e74705SXin Li     !b1;  // expected-note {{used here}}
277*67e74705SXin Li     b1 + b2;  // expected-note {{used here}}
278*67e74705SXin Li     b1[0];  // expected-note {{used here}}
279*67e74705SXin Li     (void)b1->member;  // expected-note {{used here}}
280*67e74705SXin Li   }
281*67e74705SXin Li }
282*67e74705SXin Li 
283*67e74705SXin Li namespace test12 {
284*67e74705SXin Li   class T1 {}; class T2 {}; class T3 {}; class T4 {}; class T5 {}; class T6 {};
285*67e74705SXin Li   class T7 {};
286*67e74705SXin Li 
287*67e74705SXin Li   namespace {
288*67e74705SXin Li     struct Cls {
289*67e74705SXin Li       virtual void f(int) = 0;
290*67e74705SXin Li       virtual void f(int, double) = 0;
291*67e74705SXin Li       void g(int);  // expected-warning {{function 'test12::(anonymous namespace)::Cls::g' has internal linkage but is not defined}}
292*67e74705SXin Li       void g(int, double);
293*67e74705SXin Li       virtual operator T1() = 0;
294*67e74705SXin Li       virtual operator T2() = 0;
295*67e74705SXin Li       virtual operator T3&() = 0;
296*67e74705SXin Li       operator T4();  // expected-warning {{function 'test12::(anonymous namespace)::Cls::operator T4' has internal linkage but is not defined}}
297*67e74705SXin Li       operator T5();  // expected-warning {{function 'test12::(anonymous namespace)::Cls::operator T5' has internal linkage but is not defined}}
298*67e74705SXin Li       operator T6&();  // expected-warning {{function 'test12::(anonymous namespace)::Cls::operator test12::T6 &' has internal linkage but is not defined}}
299*67e74705SXin Li     };
300*67e74705SXin Li 
301*67e74705SXin Li     struct Cls2 {
302*67e74705SXin Li       Cls2(T7);  // expected-warning {{function 'test12::(anonymous namespace)::Cls2::Cls2' has internal linkage but is not defined}}
303*67e74705SXin Li     };
304*67e74705SXin Li   }
305*67e74705SXin Li 
test(Cls & c)306*67e74705SXin Li   void test(Cls &c) {
307*67e74705SXin Li     c.f(7);
308*67e74705SXin Li     c.g(7);  // expected-note {{used here}}
309*67e74705SXin Li     (void)static_cast<T1>(c);
310*67e74705SXin Li     T2 t2 = c;
311*67e74705SXin Li     T3 &t3 = c;
312*67e74705SXin Li     (void)static_cast<T4>(c); // expected-note {{used here}}
313*67e74705SXin Li     T5 t5 = c;  // expected-note {{used here}}
314*67e74705SXin Li     T6 &t6 = c;  // expected-note {{used here}}
315*67e74705SXin Li 
316*67e74705SXin Li     Cls2 obj1((T7()));  // expected-note {{used here}}
317*67e74705SXin Li   }
318*67e74705SXin Li }
319*67e74705SXin Li 
320*67e74705SXin Li namespace test13 {
321*67e74705SXin Li   namespace {
322*67e74705SXin Li     struct X {
ftest13::__anon28cc8d9f1011::X323*67e74705SXin Li       virtual void f() { }
324*67e74705SXin Li     };
325*67e74705SXin Li 
326*67e74705SXin Li     struct Y : public X {
327*67e74705SXin Li       virtual void f() = 0;
328*67e74705SXin Li 
gtest13::__anon28cc8d9f1011::Y329*67e74705SXin Li       virtual void g() {
330*67e74705SXin Li         X::f();
331*67e74705SXin Li       }
332*67e74705SXin Li     };
333*67e74705SXin Li   }
334*67e74705SXin Li }
335*67e74705SXin Li 
336*67e74705SXin Li namespace test14 {
337*67e74705SXin Li   extern "C" const int foo;
338*67e74705SXin Li 
f()339*67e74705SXin Li   int f() {
340*67e74705SXin Li     return foo;
341*67e74705SXin Li   }
342*67e74705SXin Li }
343