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
217
218
| // RUN: %clang_cc1 -fno-rtti %s -emit-llvm -o %t -triple=i386-pc-win32 -fdump-vtable-layouts 2>&1 | FileCheck --check-prefix=VFTABLES %s
// RUN: FileCheck --check-prefix=GLOBALS %s < %t
// RUN: FileCheck --check-prefix=CODEGEN %s < %t
namespace test1 {
// Some covariant types.
struct A { int a; };
struct B { int b; };
struct C : A, B { int c; };
struct D : C { int d; };
struct E : D { int e; };
// One base class and two overrides, all with covariant return types.
struct H { virtual B *foo(); };
struct I : H { virtual C *foo(); };
struct J : I { virtual D *foo(); J(); };
struct K : J { virtual E *foo(); K(); };
J::J() {}
// VFTABLES-LABEL: VFTable for 'test1::H' in 'test1::I' in 'test1::J' (3 entries).
// VFTABLES-NEXT: 0 | test1::D *test1::J::foo()
// VFTABLES-NEXT: [return adjustment (to type 'struct test1::B *'): 4 non-virtual]
// VFTABLES-NEXT: 1 | test1::D *test1::J::foo()
// VFTABLES-NEXT: [return adjustment (to type 'struct test1::C *'): 0 non-virtual]
// VFTABLES-NEXT: 2 | test1::D *test1::J::foo()
// GLOBALS-LABEL: @"??_7J@test1@@6B@" = linkonce_odr unnamed_addr constant { [3 x i8*] }
// GLOBALS: @"?foo@J@test1@@QAEPAUB@2@XZ"
// GLOBALS: @"?foo@J@test1@@QAEPAUC@2@XZ"
// GLOBALS: @"?foo@J@test1@@UAEPAUD@2@XZ"
K::K() {}
// VFTABLES-LABEL: VFTable for 'test1::H' in 'test1::I' in 'test1::J' in 'test1::K' (4 entries).
// VFTABLES-NEXT: 0 | test1::E *test1::K::foo()
// VFTABLES-NEXT: [return adjustment (to type 'struct test1::B *'): 4 non-virtual]
// VFTABLES-NEXT: 1 | test1::E *test1::K::foo()
// VFTABLES-NEXT: [return adjustment (to type 'struct test1::C *'): 0 non-virtual]
// VFTABLES-NEXT: 2 | test1::E *test1::K::foo()
// VFTABLES-NEXT: [return adjustment (to type 'struct test1::D *'): 0 non-virtual]
// VFTABLES-NEXT: 3 | test1::E *test1::K::foo()
// Only B to C requires adjustment, but we get 3 thunks in K's vftable, two of
// which are trivial.
// GLOBALS-LABEL: @"??_7K@test1@@6B@" = linkonce_odr unnamed_addr constant { [4 x i8*] }
// GLOBALS: @"?foo@K@test1@@QAEPAUB@2@XZ"
// GLOBALS: @"?foo@K@test1@@QAEPAUC@2@XZ"
// GLOBALS: @"?foo@K@test1@@QAEPAUD@2@XZ"
// GLOBALS: @"?foo@K@test1@@UAEPAUE@2@XZ"
// This thunk has a return adjustment.
// CODEGEN-LABEL: define {{.*}} @"?foo@K@test1@@QAEPAUB@2@XZ"
// CODEGEN: call {{.*}} @"?foo@K@test1@@UAEPAUE@2@XZ"
// CODEGEN: icmp {{.*}}, null
// CODEGEN: getelementptr
// CODEGEN: ret
// These two don't.
// CODEGEN-LABEL: define {{.*}} @"?foo@K@test1@@QAEPAUC@2@XZ"
// CODEGEN: call {{.*}} @"?foo@K@test1@@UAEPAUE@2@XZ"
// CODEGEN-NEXT: ret
// CODEGEN-LABEL: define {{.*}} @"?foo@K@test1@@QAEPAUD@2@XZ"
// CODEGEN: call {{.*}} @"?foo@K@test1@@UAEPAUE@2@XZ"
// CODEGEN-NEXT: ret
}
namespace test2 {
// Covariant types. D* is not trivially convertible to C*.
struct A { int a; };
struct B { int b; };
struct C : B { int c; };
struct D : A, C { int d; };
struct E : D { int e; };
// J's foo will require an adjusting thunk, and K will require a trivial thunk.
struct H { virtual B *foo(); };
struct I : H { virtual C *foo(); };
struct J : I { virtual D *foo(); J(); };
struct K : J { virtual E *foo(); K(); };
J::J() {}
// VFTABLES-LABEL: VFTable for 'test2::H' in 'test2::I' in 'test2::J' (2 entries).
// VFTABLES-NEXT: 0 | test2::D *test2::J::foo()
// VFTABLES-NEXT: [return adjustment (to type 'struct test2::B *'): 4 non-virtual]
// VFTABLES-NEXT: 1 | test2::D *test2::J::foo()
// GLOBALS-LABEL: @"??_7J@test2@@6B@" = linkonce_odr unnamed_addr constant { [2 x i8*] }
K::K() {}
// VFTABLES-LABEL: VFTable for 'test2::H' in 'test2::I' in 'test2::J' in 'test2::K' (3 entries).
// VFTABLES-NEXT: 0 | test2::E *test2::K::foo()
// VFTABLES-NEXT: [return adjustment (to type 'struct test2::B *'): 4 non-virtual]
// VFTABLES-NEXT: 1 | test2::E *test2::K::foo()
// VFTABLES-NEXT: [return adjustment (to type 'struct test2::D *'): 0 non-virtual]
// VFTABLES-NEXT: 2 | test2::E *test2::K::foo()
// GLOBALS-LABEL: @"??_7K@test2@@6B@" = linkonce_odr unnamed_addr constant { [3 x i8*] }
}
namespace pr20479 {
struct A {
virtual A *f();
};
struct B : virtual A {
virtual B *f();
};
struct C : virtual A, B {
// VFTABLES-LABEL: VFTable for 'pr20479::A' in 'pr20479::B' in 'pr20479::C' (2 entries).
// VFTABLES-NEXT: 0 | pr20479::B *pr20479::B::f()
// VFTABLES-NEXT: [return adjustment (to type 'struct pr20479::A *'): vbase #1, 0 non-virtual]
// VFTABLES-NEXT: 1 | pr20479::B *pr20479::B::f()
C();
};
C::C() {}
// GLOBALS-LABEL: @"??_7C@pr20479@@6B@" = linkonce_odr unnamed_addr constant { [2 x i8*] }
// GLOBALS: @"?f@B@pr20479@@QAEPAUA@2@XZ"
// GLOBALS: @"?f@B@pr20479@@UAEPAU12@XZ"
}
namespace pr21073 {
struct A {
virtual A *f();
};
struct B : virtual A {
virtual B *f();
};
struct C : virtual A, virtual B {
// VFTABLES-LABEL: VFTable for 'pr21073::A' in 'pr21073::B' in 'pr21073::C' (2 entries).
// VFTABLES-NEXT: 0 | pr21073::B *pr21073::B::f()
// VFTABLES-NEXT: [return adjustment (to type 'struct pr21073::A *'): vbase #1, 0 non-virtual]
// VFTABLES-NEXT: [this adjustment: 8 non-virtual]
// VFTABLES-NEXT: 1 | pr21073::B *pr21073::B::f()
// VFTABLES-NEXT: [return adjustment (to type 'struct pr21073::B *'): 0 non-virtual]
// VFTABLES-NEXT: [this adjustment: 8 non-virtual]
C();
};
C::C() {}
// GLOBALS-LABEL: @"??_7C@pr21073@@6B@" = linkonce_odr unnamed_addr constant { [2 x i8*] }
// GLOBALS: @"?f@B@pr21073@@WPPPPPPPI@AEPAUA@2@XZ"
// GLOBALS: @"?f@B@pr21073@@WPPPPPPPI@AEPAU12@XZ"
}
namespace pr21073_2 {
struct A { virtual A *foo(); };
struct B : virtual A {};
struct C : virtual A { virtual C *foo(); };
struct D : B, C { D(); };
D::D() {}
// VFTABLES-LABEL: VFTable for 'pr21073_2::A' in 'pr21073_2::C' in 'pr21073_2::D' (2 entries)
// VFTABLES-NEXT: 0 | pr21073_2::C *pr21073_2::C::foo()
// VFTABLES-NEXT: [return adjustment (to type 'struct pr21073_2::A *'): vbase #1, 0 non-virtual]
// VFTABLES-NEXT: 1 | pr21073_2::C *pr21073_2::C::foo()
// GLOBALS-LABEL: @"??_7D@pr21073_2@@6B@" = {{.*}} constant { [2 x i8*] }
// GLOBALS: @"?foo@C@pr21073_2@@QAEPAUA@2@XZ"
// GLOBALS: @"?foo@C@pr21073_2@@UAEPAU12@XZ"
}
namespace test3 {
struct A { virtual A *fn(); };
struct B : virtual A { virtual B *fn(); };
struct X : virtual B {};
struct Y : virtual B {};
struct C : X, Y {};
struct D : virtual B, virtual A, C {
D *fn();
D();
};
D::D() {}
// VFTABLES-LABEL: VFTable for 'test3::A' in 'test3::B' in 'test3::X' in 'test3::C' in 'test3::D' (3 entries).
// VFTABLES-NEXT: 0 | test3::D *test3::D::fn()
// VFTABLES-NEXT: [return adjustment (to type 'struct test3::A *'): vbase #1, 0 non-virtual]
// VFTABLES-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
// VFTABLES-NEXT: 1 | test3::D *test3::D::fn()
// VFTABLES-NEXT: [return adjustment (to type 'struct test3::B *'): vbase #2, 0 non-virtual]
// VFTABLES-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
// VFTABLES-NEXT: 2 | test3::D *test3::D::fn()
// VFTABLES-NEXT: [return adjustment (to type 'struct test3::D *'): 0 non-virtual]
// VFTABLES-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
// GLOBALS-LABEL: @"??_7D@test3@@6B@" = {{.*}} constant { [3 x i8*] }
// GLOBALS: @"?fn@D@test3@@$4PPPPPPPM@A@AEPAUA@2@XZ"
// GLOBALS: @"?fn@D@test3@@$4PPPPPPPM@A@AEPAUB@2@XZ"
// GLOBALS: @"?fn@D@test3@@$4PPPPPPPM@A@AEPAU12@XZ"
}
namespace pr34302 {
// C::f is lives in the vftable inside its virtual B subobject. In the MS ABI,
// covariant return type virtual methods extend vftables from virtual bases,
// even though that can make it impossible to implement certain diamond
// hierarchies correctly.
struct A { virtual ~A(); };
struct B : A { virtual B *f(); };
struct C : virtual B { C *f(); };
C c;
// VFTABLES-LABEL: VFTable indices for 'pr34302::C' (2 entries).
// VFTABLES-NEXT: -- accessible via vbtable index 1, vfptr at offset 0 --
// VFTABLES-NEXT: 0 | pr34302::C::~C() [scalar deleting]
// VFTABLES-NEXT: 2 | pr34302::C *pr34302::C::f()
}
|