1 // RUN: %clang_cc1 -verify -Wno-return-type -Wno-main -std=c++11 -emit-llvm -triple %itanium_abi_triple -o - %s | FileCheck %s
2 // RUN: %clang_cc1 -verify -Wno-return-type -Wno-main -std=c++20 -emit-llvm -triple x86_64-linux-gnu -o - %s | FileCheck %s --check-prefixes=CHECK,CXX20
3 // expected-no-diagnostics
4
5 namespace test1 {
6 int x;
7 template <int& D> class T { };
8 // CHECK: void @_ZN5test12f0ENS_1TIL_ZNS_1xEEEE(
f0(T<x> a0)9 void f0(T<x> a0) {}
10 }
11
12 namespace test1 {
13 // CHECK: void @_ZN5test12f0Ef
f0(float)14 void f0(float) {}
15 template<void (&)(float)> struct t1 {};
16 // CHECK: void @_ZN5test12f1ENS_2t1IL_ZNS_2f0EfEEE(
f1(t1<f0> a0)17 void f1(t1<f0> a0) {}
18 }
19
20 namespace test2 {
21 // CHECK: void @_ZN5test22f0Ef
f0(float)22 void f0(float) {}
23 template<void (*)(float)> struct t1 {};
24 // CHECK: void @_ZN5test22f1ENS_2t1IXadL_ZNS_2f0EfEEEE(
f1(t1<f0> a0)25 void f1(t1<f0> a0) {}
26 }
27
28 namespace test3 {
29 // CHECK: void @test3_f0
test3_f0(float)30 extern "C" void test3_f0(float) {}
31 template<void (&)(float)> struct t1 {};
32 // CHECK: void @_ZN5test32f1ENS_2t1IL_Z8test3_f0EEE(
f1(t1<test3_f0> a0)33 void f1(t1<test3_f0> a0) {}
34 }
35
36 namespace test4 {
37 // CHECK: void @test4_f0
test4_f0(float)38 extern "C" void test4_f0(float) {}
39 template<void (*)(float)> struct t1 {};
40 // CHECK: void @_ZN5test42f1ENS_2t1IXadL_Z8test4_f0EEEE(
f1(t1<test4_f0> a0)41 void f1(t1<test4_f0> a0) {}
42 }
43
44 // CHECK: void @test5_f0
test5_f0(float)45 extern "C" void test5_f0(float) {}
main(int)46 int main(int) {}
47
48 namespace test5 {
49 template<void (&)(float)> struct t1 {};
50 // CHECK: void @_ZN5test52f1ENS_2t1IL_Z8test5_f0EEE(
f1(t1<test5_f0> a0)51 void f1(t1<test5_f0> a0) {}
52
53 template<int (&)(int)> struct t2 {};
54 // CHECK: void @_ZN5test52f2ENS_2t2IL_Z4mainEEE
f2(t2<main> a0)55 void f2(t2<main> a0) {}
56 }
57
58 namespace test6 {
59 struct A { void im0(float); };
60 // CHECK: void @_ZN5test61A3im0Ef
im0(float)61 void A::im0(float) {}
62 template <void(A::*)(float)> class T { };
63 // CHECK: void @_ZN5test62f0ENS_1TIXadL_ZNS_1A3im0EfEEEE(
f0(T<& A::im0> a0)64 void f0(T<&A::im0> a0) {}
65 }
66
67 namespace test7 {
68 template<typename T>
69 struct meta {
70 static const unsigned value = sizeof(T);
71 };
72
73 template<unsigned> struct int_c {
74 typedef float type;
75 };
76
77 template<typename T>
78 struct X {
79 template<typename U>
Xtest7::X80 X(U*, typename int_c<(meta<T>::value + meta<U>::value)>::type *) { }
81 };
82
83 // CHECK: define weak_odr {{.*}} @_ZN5test71XIiEC1IdEEPT_PNS_5int_cIXplL_ZNS_4metaIiE5valueEEsr4metaIS3_EE5valueEE4typeE(
84 template X<int>::X(double*, float*);
85 }
86
87 namespace test8 {
88 template<typename T>
89 struct meta {
90 struct type {
91 static const unsigned value = sizeof(T);
92 };
93 };
94
95 template<unsigned> struct int_c {
96 typedef float type;
97 };
98
99 template<typename T>
f(int_c<meta<T>::type::value>)100 void f(int_c<meta<T>::type::value>) { }
101
102 // CHECK-LABEL: define weak_odr {{.*}}void @_ZN5test81fIiEEvNS_5int_cIXsr4metaIT_E4typeE5valueEEE(
103 template void f<int>(int_c<sizeof(int)>);
104 }
105
106 namespace test9 {
107 template<typename T>
108 struct supermeta {
109 template<typename U>
110 struct apply {
111 typedef T U::*type;
112 };
113 };
114
115 struct X { };
116
117 template<typename T, typename U>
118 typename supermeta<T>::template apply<U>::type f();
119
test_f()120 void test_f() {
121 // CHECK: @_ZN5test91fIiNS_1XEEENS_9supermetaIT_E5applyIT0_E4typeEv()
122 // Note: GCC incorrectly mangles this as
123 // _ZN5test91fIiNS_1XEEENS_9supermetaIT_E5apply4typeEv, while EDG
124 // gets it right.
125 f<int, X>();
126 }
127 }
128
129 namespace test10 {
130 template<typename T>
131 struct X {
132 template<typename U>
133 struct definition {
134 };
135 };
136
137 // CHECK: _ZN6test101fIidEENS_1XIT_E10definitionIT0_EES2_S5_
138 template<typename T, typename U>
f(T,U)139 typename X<T>::template definition<U> f(T, U) { }
140
g(int i,double d)141 void g(int i, double d) {
142 f(i, d);
143 }
144 }
145
146 // Report from cxx-abi-dev, 2012.01.04.
147 namespace test11 {
148 int cmp(char a, char b);
149 template <typename T, int (*cmp)(T, T)> struct A {};
f(A<T,cmp> &)150 template <typename T> void f(A<T,cmp> &) {}
151 template void f<char>(A<char,cmp> &);
152 // CHECK: @_ZN6test111fIcEEvRNS_1AIT_L_ZNS_3cmpEccEEE(
153 }
154
155 namespace test12 {
156 // Make sure we can mangle non-type template args with internal linkage.
f()157 static int f() {}
158 const int n = 10;
test()159 template<typename T, T v> void test() {}
use()160 void use() {
161 // CHECK-LABEL: define internal {{.*}}void @_ZN6test124testIFivEXadL_ZNS_L1fEvEEEEvv(
162 test<int(), &f>();
163 // CHECK-LABEL: define internal {{.*}}void @_ZN6test124testIRFivEL_ZNS_L1fEvEEEvv(
164 test<int(&)(), f>();
165 // CHECK-LABEL: define internal {{.*}}void @_ZN6test124testIPKiXadL_ZNS_L1nEEEEEvv(
166 test<const int*, &n>();
167 // CHECK-LABEL: define internal {{.*}}void @_ZN6test124testIRKiL_ZNS_L1nEEEEvv(
168 test<const int&, n>();
169 }
170 }
171
172 // rdar://problem/12072531
173 // Test the boundary condition of minimal signed integers.
174 namespace test13 {
returnChar()175 template <char c> char returnChar() { return c; }
176 template char returnChar<-128>();
177 // CHECK: @_ZN6test1310returnCharILcn128EEEcv()
178
returnShort()179 template <short s> short returnShort() { return s; }
180 template short returnShort<-32768>();
181 // CHECK: @_ZN6test1311returnShortILsn32768EEEsv()
182 }
183
184 namespace test14 {
inl(bool b)185 template <typename> inline int inl(bool b) {
186 if (b) {
187 static struct {
188 int field;
189 } a;
190 // CHECK: @_ZZN6test143inlIvEEibE1a
191
192 return a.field;
193 } else {
194 static struct {
195 int field;
196 } a;
197 // CHECK: @_ZZN6test143inlIvEEibE1a_0
198
199 return a.field;
200 }
201 }
202
call(bool b)203 int call(bool b) { return inl<void>(b); }
204 }
205
206 namespace std {
207 template <class _Tp, _Tp...> struct integer_sequence {};
208 }
209
210 namespace test15 {
211 template <int N>
make()212 __make_integer_seq<std::integer_sequence, int, N> make() {}
213 template __make_integer_seq<std::integer_sequence, int, 5> make<5>();
214 // CHECK: define weak_odr {{.*}} @_ZN6test154makeILi5EEE18__make_integer_seqISt16integer_sequenceiXT_EEv(
215 }
216
217 namespace test16 {
218 // Ensure we properly form substitutions for template names in prefixes.
219 // CHECK: @_ZN6test161fINS_1TEEEvNT_1UIiE1VIiEENS5_IfEE
220 template<typename T> void f(typename T::template U<int>::template V<int>, typename T::template U<int>::template V<float>);
221 struct T { template<typename I> struct U { template<typename J> using V = int; }; };
g()222 void g() { f<T>(1, 2); }
223 }
224
225 #if __cplusplus >= 202002L
226 namespace cxx20 {
227 template<auto> struct A {};
228 template<typename T, T V> struct B {};
229
230 int x;
231 // CXX20: define {{.*}} @_ZN5cxx201fENS_1AIXadL_ZNS_1xEEEEE(
f(A<& x>)232 void f(A<&x>) {}
233 // CXX20: define {{.*}} @_ZN5cxx201fENS_1BIPiXadL_ZNS_1xEEEEE(
f(B<int *,& x>)234 void f(B<int*, &x>) {}
235 // CXX20: define {{.*}} @_ZN5cxx201fENS_1AIXcvPKiadL_ZNS_1xEEEEE(
f(A<(const int *)& x>)236 void f(A<(const int*)&x>) {}
237 // CXX20: define {{.*}} @_ZN5cxx201fENS_1BIPKiXadL_ZNS_1xEEEEE(
f(B<const int *,& x>)238 void f(B<const int*, &x>) {}
239 // CXX20: define {{.*}} @_ZN5cxx201fENS_1AIXcvPvadL_ZNS_1xEEEEE(
f(A<(void *)& x>)240 void f(A<(void*)&x>) {}
241 // CXX20: define {{.*}} @_ZN5cxx201fENS_1BIPvXadL_ZNS_1xEEEEE(
f(B<void *,(void *)& x>)242 void f(B<void*, (void*)&x>) {}
243 // CXX20: define {{.*}} @_ZN5cxx201fENS_1AIXcvPKvadL_ZNS_1xEEEEE(
f(A<(const void *)& x>)244 void f(A<(const void*)&x>) {}
245 // CXX20: define {{.*}} @_ZN5cxx201fENS_1BIPKvXadL_ZNS_1xEEEEE(
f(B<const void *,(const void *)& x>)246 void f(B<const void*, (const void*)&x>) {}
247
248 struct Q { int x; };
249
250 // CXX20: define {{.*}} @_ZN5cxx201fENS_1AIXadL_ZNS_1Q1xEEEEE(
f(A<& Q::x>)251 void f(A<&Q::x>) {}
252 // CXX20: define {{.*}} @_ZN5cxx201fENS_1BIMNS_1QEiXadL_ZNS1_1xEEEEE
f(B<int Q::*,& Q::x>)253 void f(B<int Q::*, &Q::x>) {}
254 // CXX20: define {{.*}} @_ZN5cxx201fENS_1AIXcvMNS_1QEKiadL_ZNS1_1xEEEEE(
f(A<(const int Q::*)& Q::x>)255 void f(A<(const int Q::*)&Q::x>) {}
256 // CXX20: define {{.*}} @_ZN5cxx201fENS_1BIMNS_1QEKiXadL_ZNS1_1xEEEEE(
f(B<const int Q::*,(const int Q::*)& Q::x>)257 void f(B<const int Q::*, (const int Q::*)&Q::x>) {}
258 }
259 #endif
260
261 namespace test17 {
262 // Ensure we mangle the types for non-type template arguments if we've lost
263 // track of argument / parameter correspondence.
264 template<int A, int ...B> struct X {};
265
266 // CHECK: define {{.*}} @_ZN6test171fILi1EJLi2ELi3ELi4EEEEvNS_1XIXT_EJLi5EXspT0_ELi6EEEE
f(X<D,5u,C...,6u>)267 template<int D, int ...C> void f(X<D, 5u, C..., 6u>) {}
g()268 void g() { f<1, 2, 3, 4>({}); }
269
270 // Note: there is no J...E here, because we can't form a pack argument, and
271 // the 5u and 6u are mangled with the original type 'j' (unsigned int) not
272 // with the resolved type 'i' (signed int).
273 // CHECK: define {{.*}} @_ZN6test171hILi4EJLi1ELi2ELi3EEEEvNS_1XIXspT0_ELj5EXT_ELj6EEE
h(X<C...,5u,D,6u>)274 template<int D, int ...C> void h(X<C..., 5u, D, 6u>) {}
i()275 void i() { h<4, 1, 2, 3>({}); }
276
277 #if __cplusplus >= 201402L
278 template<int A, const volatile int*> struct Y {};
279 int n;
280 // Case 1: &n is a resolved template argument, with a known parameter:
281 // mangled with no conversion.
282 // CXX20: define {{.*}} @_ZN6test172j1ILi1EEEvNS_1YIXT_EXadL_ZNS_1nEEEEE
j1(Y<N,(const int *)& n>)283 template<int N> void j1(Y<N, (const int*)&n>) {}
284 // Case 2: &n is an unresolved template argument, with an unknown
285 // corresopnding parameter: mangled as the source expression.
286 // CXX20: define {{.*}} @_ZN6test172j2IJLi1EEEEvNS_1YIXspT_EXcvPKiadL_ZNS_1nEEEEE
j2(Y<Ns...,(const int *)& n>)287 template<int ...Ns> void j2(Y<Ns..., (const int*)&n>) {}
288 // Case 3: &n is a resolved template argument, with a known parameter, but
289 // for a template that can be overloaded on type: mangled with the parameter type.
290 // CXX20: define {{.*}} @_ZN6test172j3ILi1EEEvDTplT_clL_ZNS_1yIXcvPVKiadL_ZNS_1nEEEEEivEEE
291 template<const volatile int*> int y();
292 template<int N> void j3(decltype(N + y<(const int*)&n>())) {}
k()293 void k() {
294 j1<1>(Y<1, &n>());
295 j2<1>(Y<1, &n>());
296 j3<1>(0);
297 }
298 #endif
299 }
300
301 namespace partially_dependent_template_args {
302 namespace test1 {
303 template<bool B> struct enable { using type = int; };
304 template<typename ...> struct and_ { static constexpr bool value = true; };
f(T)305 template<typename T> inline typename enable<and_<T, T, T>::value>::type f(T) {}
306 // FIXME: GCC and ICC form a J...E mangling for the pack here. Clang
307 // doesn't do so when mangling an <unresolved-prefix>. It's not clear who's
308 // right. See https://github.com/itanium-cxx-abi/cxx-abi/issues/113.
309 // CHECK: @_ZN33partially_dependent_template_args5test11fIiEENS0_6enableIXsr4and_IT_S3_S3_EE5valueEE4typeES3_
g()310 void g() { f(0); }
311 }
312
313 namespace test2 {
314 struct X { int n; };
315 template<unsigned> int f(X);
316
317 template<typename T> void g1(decltype(f<0>(T()))) {}
318 template<typename T> void g2(decltype(f<0>({}) + T())) {}
319 template<typename T> void g3(decltype(f<0>(X{}) + T())) {}
320 template<int N> void g4(decltype(f<0>(X{N})));
321
322 // The first of these mangles the unconverted argument Li0E because the
323 // callee is unresolved, the rest mangle the converted argument Lj0E
324 // because the callee is resolved.
h()325 void h() {
326 // CHECK: @_ZN33partially_dependent_template_args5test22g1INS0_1XEEEvDTcl1fILi0EEcvT__EEE
327 g1<X>({});
328 // CHECK: @_ZN33partially_dependent_template_args5test22g2IiEEvDTplclL_ZNS0_1fILj0EEEiNS0_1XEEilEEcvT__EE
329 g2<int>({});
330 // CHECK: @_ZN33partially_dependent_template_args5test22g3IiEEvDTplclL_ZNS0_1fILj0EEEiNS0_1XEEtlS3_EEcvT__EE
331 g3<int>({});
332 // CHECK: @_ZN33partially_dependent_template_args5test22g4ILi0EEEvDTclL_ZNS0_1fILj0EEEiNS0_1XEEtlS3_T_EEE
333 g4<0>({});
334 }
335 }
336 }
337
338 namespace fixed_size_parameter_pack {
339 template<typename ...T> struct A {
340 template<T ...> struct B {};
341 };
342 template<int ...Ns> void f(A<unsigned, char, long long>::B<0, Ns...>);
g()343 void g() { f<1, 2>({}); }
344 }
345
346 namespace type_qualifier {
347 template<typename T> using int_t = int;
348 template<typename T> void f(decltype(int_t<T*>() + 1)) {}
349 // FIXME: This mangling doesn't work: we need to mangle the
350 // instantiation-dependent 'int_t' operand.
351 // CHECK: @_ZN14type_qualifier1fIPiEEvDTplcvi_ELi1EE
352 template void f<int*>(int);
353
354 // Note that this template has different constraints but would mangle the
355 // same:
356 //template<typename T> void f(decltype(int_t<typename T::type>() + 1)) {}
357
358 struct impl { using type = void; };
359 template<typename T> using alias = impl;
360 template<typename T> void g(decltype(alias<T*>::type(), 1)) {}
361 // FIXME: Similarly we need to mangle the `T*` in here.
362 // CHECK: @_ZN14type_qualifier1gIPiEEvDTcmcvv_ELi1EE
363 template void g<int*>(int);
364 }
365