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
|
// RUN: %clang_cc1 -fno-rtti -emit-llvm %s -o - -mconstructor-aliases -triple=i386-pc-win32 | FileCheck %s
struct Left {
virtual void left();
};
struct Right {
virtual void right();
};
struct ChildNoOverride : Left, Right {
};
struct ChildOverride : Left, Right {
virtual void left();
virtual void right();
};
extern "C" void foo(void *);
void call_left_no_override(ChildNoOverride *child) {
// CHECK-LABEL: define void @"\01?call_left_no_override
// CHECK: %[[CHILD:.*]] = load %struct.ChildNoOverride
child->left();
// Only need to cast 'this' to Left*.
// CHECK: %[[LEFT:.*]] = bitcast %struct.ChildNoOverride* %[[CHILD]] to %struct.Left*
// CHECK: %[[VFPTR:.*]] = bitcast %struct.Left* %[[LEFT]] to void (%struct.Left*)***
// CHECK: %[[VFTABLE:.*]] = load void (%struct.Left*)**, void (%struct.Left*)*** %[[VFPTR]]
// CHECK: %[[VFUN:.*]] = getelementptr inbounds void (%struct.Left*)*, void (%struct.Left*)** %[[VFTABLE]], i64 0
// CHECK: %[[VFUN_VALUE:.*]] = load void (%struct.Left*)*, void (%struct.Left*)** %[[VFUN]]
// CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](%struct.Left* %[[LEFT]])
// CHECK: ret
}
void ChildOverride::left() {
// CHECK-LABEL: define x86_thiscallcc void @"\01?left@ChildOverride@@UAEXXZ"
// CHECK-SAME: (%struct.ChildOverride* %[[THIS:.*]])
//
// No need to adjust 'this' as the ChildOverride's layout begins with Left.
// CHECK: %[[THIS_ADDR:.*]] = alloca %struct.ChildOverride*, align 4
// CHECK: store %struct.ChildOverride* %[[THIS]], %struct.ChildOverride** %[[THIS_ADDR]], align 4
foo(this);
// CHECK: %[[THIS:.*]] = load %struct.ChildOverride*, %struct.ChildOverride** %[[THIS_ADDR]]
// CHECK: %[[THIS_i8:.*]] = bitcast %struct.ChildOverride* %[[THIS]] to i8*
// CHECK: call void @foo(i8* %[[THIS_i8]])
// CHECK: ret
}
void call_left_override(ChildOverride *child) {
// CHECK-LABEL: define void @"\01?call_left_override
// CHECK: %[[CHILD:.*]] = load %struct.ChildOverride
child->left();
// CHECK: %[[VFPTR:.*]] = bitcast %struct.ChildOverride* %[[CHILD]] to void (%struct.ChildOverride*)***
// CHECK: %[[VFTABLE:.*]] = load void (%struct.ChildOverride*)**, void (%struct.ChildOverride*)*** %[[VFPTR]]
// CHECK: %[[VFUN:.*]] = getelementptr inbounds void (%struct.ChildOverride*)*, void (%struct.ChildOverride*)** %[[VFTABLE]], i64 0
// CHECK: %[[VFUN_VALUE:.*]] = load void (%struct.ChildOverride*)*, void (%struct.ChildOverride*)** %[[VFUN]]
//
// CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](%struct.ChildOverride* %[[CHILD]])
// CHECK: ret
}
void call_right_no_override(ChildNoOverride *child) {
// CHECK-LABEL: define void @"\01?call_right_no_override
// CHECK: %[[CHILD:.*]] = load %struct.ChildNoOverride
child->right();
// When calling a right base's virtual method, one needs to adjust 'this' at
// the caller site.
//
// CHECK: %[[CHILD_i8:.*]] = bitcast %struct.ChildNoOverride* %[[CHILD]] to i8*
// CHECK: %[[RIGHT_i8:.*]] = getelementptr inbounds i8, i8* %[[CHILD_i8]], i32 4
// CHECK: %[[RIGHT:.*]] = bitcast i8* %[[RIGHT_i8]] to %struct.Right*
//
// CHECK: %[[VFPTR:.*]] = bitcast %struct.Right* %[[RIGHT]] to void (%struct.Right*)***
// CHECK: %[[VFTABLE:.*]] = load void (%struct.Right*)**, void (%struct.Right*)*** %[[VFPTR]]
// CHECK: %[[VFUN:.*]] = getelementptr inbounds void (%struct.Right*)*, void (%struct.Right*)** %[[VFTABLE]], i64 0
// CHECK: %[[VFUN_VALUE:.*]] = load void (%struct.Right*)*, void (%struct.Right*)** %[[VFUN]]
// CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](%struct.Right* %[[RIGHT]])
// CHECK: ret
}
void ChildOverride::right() {
// CHECK-LABEL: define x86_thiscallcc void @"\01?right@ChildOverride@@UAEXXZ"(i8*
//
// ChildOverride::right gets 'this' cast to Right* in ECX (i.e. this+4) so we
// need to adjust 'this' before use.
//
// CHECK: %[[THIS_ADDR:.*]] = alloca %struct.ChildOverride*, align 4
// CHECK: %[[THIS_INIT:.*]] = bitcast i8* %[[ECX:.*]] to %struct.ChildOverride*
// CHECK: store %struct.ChildOverride* %[[THIS_INIT]], %struct.ChildOverride** %[[THIS_ADDR]], align 4
// CHECK: %[[THIS_RELOAD:.*]] = load %struct.ChildOverride*, %struct.ChildOverride** %[[THIS_ADDR]]
// CHECK: %[[THIS_i8:.*]] = bitcast %struct.ChildOverride* %[[THIS_RELOAD]] to i8*
// CHECK: %[[THIS_ADJUSTED:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 -4
// CHECK: %[[THIS:.*]] = bitcast i8* %[[THIS_ADJUSTED]] to %struct.ChildOverride*
foo(this);
// CHECK: %[[THIS_PARAM:.*]] = bitcast %struct.ChildOverride* %[[THIS]] to i8*
// CHECK: call void @foo(i8* %[[THIS_PARAM]])
// CHECK: ret
}
void call_right_override(ChildOverride *child) {
// CHECK-LABEL: define void @"\01?call_right_override
// CHECK: %[[CHILD:.*]] = load %struct.ChildOverride
child->right();
// When calling a right child's virtual method, one needs to adjust 'this' at
// the caller site.
//
// CHECK: %[[CHILD_i8:.*]] = bitcast %struct.ChildOverride* %[[CHILD]] to i8*
//
// CHECK: %[[VFPTR_i8:.*]] = getelementptr inbounds i8, i8* %[[CHILD_i8]], i32 4
// CHECK: %[[VFPTR:.*]] = bitcast i8* %[[VFPTR_i8]] to void (i8*)***
// CHECK: %[[VFTABLE:.*]] = load void (i8*)**, void (i8*)*** %[[VFPTR]]
// CHECK: %[[VFUN:.*]] = getelementptr inbounds void (i8*)*, void (i8*)** %[[VFTABLE]], i64 0
// CHECK: %[[VFUN_VALUE:.*]] = load void (i8*)*, void (i8*)** %[[VFUN]]
//
// CHECK: %[[CHILD_i8:.*]] = bitcast %struct.ChildOverride* %[[CHILD]] to i8*
// CHECK: %[[RIGHT:.*]] = getelementptr inbounds i8, i8* %[[CHILD_i8]], i32 4
//
// CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](i8* %[[RIGHT]])
// CHECK: ret
}
struct GrandchildOverride : ChildOverride {
virtual void right();
};
void GrandchildOverride::right() {
// CHECK-LABEL: define x86_thiscallcc void @"\01?right@GrandchildOverride@@UAEXXZ"(i8*
//
// CHECK: %[[THIS_ADDR:.*]] = alloca %struct.GrandchildOverride*, align 4
// CHECK: %[[THIS_INIT:.*]] = bitcast i8* %[[ECX:.*]] to %struct.GrandchildOverride*
// CHECK: store %struct.GrandchildOverride* %[[THIS_INIT]], %struct.GrandchildOverride** %[[THIS_ADDR]], align 4
// CHECK: %[[THIS_RELOAD:.*]] = load %struct.GrandchildOverride*, %struct.GrandchildOverride** %[[THIS_ADDR]]
// CHECK: %[[THIS_i8:.*]] = bitcast %struct.GrandchildOverride* %[[THIS_RELOAD]] to i8*
// CHECK: %[[THIS_ADJUSTED:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 -4
// CHECK: %[[THIS:.*]] = bitcast i8* %[[THIS_ADJUSTED]] to %struct.GrandchildOverride*
foo(this);
// CHECK: %[[THIS_PARAM:.*]] = bitcast %struct.GrandchildOverride* %[[THIS]] to i8*
// CHECK: call void @foo(i8* %[[THIS_PARAM]])
// CHECK: ret
}
void call_grandchild_right(GrandchildOverride *obj) {
// Just make sure we don't crash.
obj->right();
}
void emit_ctors() {
Left l;
// CHECK-LABEL: define {{.*}} @"\01??0Left@@QAE@XZ"
// CHECK-NOT: getelementptr
// CHECK: store i32 (...)** bitcast ({ [1 x i8*] }* @"\01??_7Left@@6B@" to i32 (...)**)
// CHECK: ret
Right r;
// CHECK-LABEL: define {{.*}} @"\01??0Right@@QAE@XZ"
// CHECK-NOT: getelementptr
// CHECK: store i32 (...)** bitcast ({ [1 x i8*] }* @"\01??_7Right@@6B@" to i32 (...)**)
// CHECK: ret
ChildOverride co;
// CHECK-LABEL: define {{.*}} @"\01??0ChildOverride@@QAE@XZ"
// CHECK: %[[THIS:.*]] = load %struct.ChildOverride*, %struct.ChildOverride**
// CHECK: %[[VFPTR:.*]] = bitcast %struct.ChildOverride* %[[THIS]] to i32 (...)***
// CHECK: store i32 (...)** bitcast ({ [1 x i8*] }* @"\01??_7ChildOverride@@6BLeft@@@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
// CHECK: %[[THIS_i8:.*]] = bitcast %struct.ChildOverride* %[[THIS]] to i8*
// CHECK: %[[VFPTR_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 4
// CHECK: %[[VFPTR:.*]] = bitcast i8* %[[VFPTR_i8]] to i32 (...)***
// CHECK: store i32 (...)** bitcast ({ [1 x i8*] }* @"\01??_7ChildOverride@@6BRight@@@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
// CHECK: ret
GrandchildOverride gc;
// CHECK-LABEL: define {{.*}} @"\01??0GrandchildOverride@@QAE@XZ"
// CHECK: %[[THIS:.*]] = load %struct.GrandchildOverride*, %struct.GrandchildOverride**
// CHECK: %[[VFPTR:.*]] = bitcast %struct.GrandchildOverride* %[[THIS]] to i32 (...)***
// CHECK: store i32 (...)** bitcast ({ [1 x i8*] }* @"\01??_7GrandchildOverride@@6BLeft@@@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
// CHECK: %[[THIS_i8:.*]] = bitcast %struct.GrandchildOverride* %[[THIS]] to i8*
// CHECK: %[[VFPTR_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 4
// CHECK: %[[VFPTR:.*]] = bitcast i8* %[[VFPTR_i8]] to i32 (...)***
// CHECK: store i32 (...)** bitcast ({ [1 x i8*] }* @"\01??_7GrandchildOverride@@6BRight@@@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
// CHECK: ret
}
struct LeftWithNonVirtualDtor {
virtual void left();
~LeftWithNonVirtualDtor();
};
struct AsymmetricChild : LeftWithNonVirtualDtor, Right {
virtual ~AsymmetricChild();
};
void call_asymmetric_child_complete_dtor() {
// CHECK-LABEL: define void @"\01?call_asymmetric_child_complete_dtor@@YAXXZ"
AsymmetricChild obj;
// CHECK: call x86_thiscallcc %struct.AsymmetricChild* @"\01??0AsymmetricChild@@QAE@XZ"(%struct.AsymmetricChild* %[[OBJ:.*]])
// CHECK-NOT: getelementptr
// CHECK: call x86_thiscallcc void @"\01??1AsymmetricChild@@UAE@XZ"(%struct.AsymmetricChild* %[[OBJ]])
// CHECK: ret
}
|
