summaryrefslogtreecommitdiff
path: root/clang/test/CodeGenCXX/vtable-linkage.cpp
blob: 4633a3fe9569f68739589f741a7aa721c13273f5 (about) (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
// RUN: %clang_cc1 %s -triple=x86_64-apple-darwin10 -emit-llvm -o %t
// RUN: %clang_cc1 %s -triple=x86_64-apple-darwin10 -fhidden-weak-vtables -emit-llvm -o %t.hidden
// RUN: FileCheck --check-prefix=CHECK-1 %s < %t
// RUN: FileCheck --check-prefix=CHECK-2 %s < %t
// RUN: FileCheck --check-prefix=CHECK-2-HIDDEN %s < %t.hidden
// RUN: FileCheck --check-prefix=CHECK-3 %s < %t
// RUN: FileCheck --check-prefix=CHECK-4 %s < %t
// RUN: FileCheck --check-prefix=CHECK-5 %s < %t
// RUN: FileCheck --check-prefix=CHECK-5-HIDDEN %s < %t.hidden
// RUN: FileCheck --check-prefix=CHECK-6 %s < %t
// RUN: FileCheck --check-prefix=CHECK-6-HIDDEN %s < %t.hidden
// RUN: FileCheck --check-prefix=CHECK-7 %s < %t
// RUN: FileCheck --check-prefix=CHECK-8 %s < %t
// RUN: FileCheck --check-prefix=CHECK-9 %s < %t
// RUN: FileCheck --check-prefix=CHECK-10 %s < %t
// RUN: FileCheck --check-prefix=CHECK-11 %s < %t
// RUN: FileCheck --check-prefix=CHECK-12 %s < %t
// RUN: FileCheck --check-prefix=CHECK-13 %s < %t

namespace {
  struct A {
    virtual void f() { }
  };
}

void f() { A b; }

struct B {
  B();
  virtual void f();
};

B::B() { }

struct C : virtual B {
  C();
  virtual void f() { } 
};

C::C() { } 

struct D {
  virtual void f();
};

void D::f() { }

static struct : D { } e;

// The destructor is the key function.
template<typename T>
struct E {
  virtual ~E();
};

template<typename T> E<T>::~E() { }

// Anchor is the key function
template<>
struct E<char> {
  virtual void anchor();
};

void E<char>::anchor() { }

template struct E<short>;
extern template struct E<int>;

void use_E() {
  E<int> ei;
  (void)ei;
  E<long> el;
  (void)el;
}

// No key function
template<typename T>
struct F {
  virtual void foo() { }
};

// No key function
template<>
struct F<char> {
  virtual void foo() { }
};

template struct F<short>;
extern template struct F<int>;

void use_F() {
  F<char> fc;
  fc.foo();
  F<int> fi;
  fi.foo();
  F<long> fl;
  (void)fl;
}

// B has a key function that is not defined in this translation unit so its vtable
// has external linkage.
// CHECK-1: @_ZTV1B = external unnamed_addr constant

// C has no key function, so its vtable should have weak_odr linkage
// and hidden visibility (rdar://problem/7523229).
// CHECK-2: @_ZTV1C = linkonce_odr unnamed_addr constant
// CHECK-2: @_ZTS1C = linkonce_odr constant
// CHECK-2: @_ZTI1C = linkonce_odr unnamed_addr constant
// CHECK-2: @_ZTT1C = linkonce_odr unnamed_addr constant
// CHECK-2-HIDDEN: @_ZTV1C = linkonce_odr hidden unnamed_addr constant
// CHECK-2-HIDDEN: @_ZTS1C = linkonce_odr constant
// CHECK-2-HIDDEN: @_ZTI1C = linkonce_odr hidden unnamed_addr constant
// CHECK-2-HIDDEN: @_ZTT1C = linkonce_odr hidden unnamed_addr constant

// D has a key function that is defined in this translation unit so its vtable is
// defined in the translation unit.
// CHECK-3: @_ZTV1D = unnamed_addr constant
// CHECK-3: @_ZTS1D = constant
// CHECK-3: @_ZTI1D = unnamed_addr constant

// E<char> is an explicit specialization with a key function defined
// in this translation unit, so its vtable should have external
// linkage.
// CHECK-4: @_ZTV1EIcE = unnamed_addr constant
// CHECK-4: @_ZTS1EIcE = constant
// CHECK-4: @_ZTI1EIcE = unnamed_addr constant

// E<short> is an explicit template instantiation with a key function
// defined in this translation unit, so its vtable should have
// weak_odr linkage.
// CHECK-5: @_ZTV1EIsE = weak_odr unnamed_addr constant
// CHECK-5: @_ZTS1EIsE = weak_odr constant
// CHECK-5: @_ZTI1EIsE = weak_odr unnamed_addr constant
// CHECK-5-HIDDEN: @_ZTV1EIsE = weak_odr unnamed_addr constant
// CHECK-5-HIDDEN: @_ZTS1EIsE = weak_odr constant
// CHECK-5-HIDDEN: @_ZTI1EIsE = weak_odr unnamed_addr constant

// F<short> is an explicit template instantiation without a key
// function, so its vtable should have weak_odr linkage
// CHECK-6: @_ZTV1FIsE = weak_odr unnamed_addr constant
// CHECK-6: @_ZTS1FIsE = weak_odr constant
// CHECK-6: @_ZTI1FIsE = weak_odr unnamed_addr constant
// CHECK-6-HIDDEN: @_ZTV1FIsE = weak_odr unnamed_addr constant
// CHECK-6-HIDDEN: @_ZTS1FIsE = weak_odr constant
// CHECK-6-HIDDEN: @_ZTI1FIsE = weak_odr unnamed_addr constant

// E<long> is an implicit template instantiation with a key function
// defined in this translation unit, so its vtable should have
// linkonce_odr linkage.
// CHECK-7: @_ZTV1EIlE = linkonce_odr unnamed_addr constant
// CHECK-7: @_ZTS1EIlE = linkonce_odr constant
// CHECK-7: @_ZTI1EIlE = linkonce_odr unnamed_addr constant

// F<long> is an implicit template instantiation with no key function,
// so its vtable should have linkonce_odr linkage.
// CHECK-8: @_ZTV1FIlE = linkonce_odr unnamed_addr constant
// CHECK-8: @_ZTS1FIlE = linkonce_odr constant
// CHECK-8: @_ZTI1FIlE = linkonce_odr unnamed_addr constant

// F<int> is an explicit template instantiation declaration without a
// key function, so its vtable should have external linkage.
// CHECK-9: @_ZTV1FIiE = external unnamed_addr constant

// E<int> is an explicit template instantiation declaration. It has a
// key function that is not instantiated, so we should only reference
// its vtable, not define it.
// CHECK-10: @_ZTV1EIiE = external unnamed_addr constant

// The anonymous struct for e has no linkage, so the vtable should have
// internal linkage.
// CHECK-11: @"_ZTV3$_0" = internal unnamed_addr constant
// CHECK-11: @"_ZTS3$_0" = internal constant
// CHECK-11: @"_ZTI3$_0" = internal unnamed_addr constant

// The A vtable should have internal linkage since it is inside an anonymous 
// namespace.
// CHECK-12: @_ZTVN12_GLOBAL__N_11AE = internal unnamed_addr constant
// CHECK-12: @_ZTSN12_GLOBAL__N_11AE = internal constant
// CHECK-12: @_ZTIN12_GLOBAL__N_11AE = internal unnamed_addr constant

// F<char> is an explicit specialization without a key function, so
// its vtable should have linkonce_odr linkage.
// CHECK-13: @_ZTV1FIcE = linkonce_odr unnamed_addr constant
// CHECK-13: @_ZTS1FIcE = linkonce_odr constant
// CHECK-13: @_ZTI1FIcE = linkonce_odr unnamed_addr constant

// RUN: FileCheck --check-prefix=CHECK-G %s < %t
//
// CHECK-G: @_ZTV1GIiE = linkonce_odr unnamed_addr constant
template <typename T>
class G {
public:
  G() {}
  virtual void f0();
  virtual void f1();
};
template <>
void G<int>::f1() {}
template <typename T>
void G<T>::f0() {}
void G_f0()  { new G<int>(); }

// RUN: FileCheck --check-prefix=CHECK-H %s < %t

// H<int> has a key function without a body but it's a template instantiation
// so its VTable must be emitted.
// CHECK-H: @_ZTV1HIiE = linkonce_odr unnamed_addr constant
template <typename T>
class H {
public:
  virtual ~H();
};

void use_H() {
  H<int> h;
}