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
|
// RUN: %clang_cc1 -std=c++98 %s -triple armv7-none-eabi -emit-llvm -o - | FileCheck %s
// RUN: %clang_cc1 -std=c++11 %s -triple armv7-none-eabi -emit-llvm -o - | FileCheck %s
// RUN: %clang_cc1 -std=c++1z %s -triple armv7-none-eabi -emit-llvm -o - | FileCheck %s
struct A {
virtual void f();
virtual void f_const() const;
virtual void g();
A h();
};
A g();
void f(A a, A *ap, A& ar) {
// This should not be a virtual function call.
// CHECK: call void @_ZN1A1fEv(%struct.A* %a)
a.f();
// CHECK: call void %
ap->f();
// CHECK: call void %
ar.f();
// CHECK: call void @_ZN1A1fEv
A().f();
// CHECK: call void @_ZN1A1fEv
g().f();
// CHECK: call void @_ZN1A1fEv
a.h().f();
// CHECK: call void @_ZNK1A7f_constEv
a.f_const();
// CHECK: call void @_ZN1A1fEv
(a).f();
}
struct D : A { virtual void g(); };
struct XD { D d; };
D gd();
void fd(D d, XD xd, D *p) {
// CHECK: call void @_ZN1A1fEv(%struct.A*
d.f();
// CHECK: call void @_ZN1D1gEv(%struct.D*
d.g();
// CHECK: call void @_ZN1A1fEv
D().f();
// CHECK: call void @_ZN1D1gEv
D().g();
// CHECK: call void @_ZN1A1fEv
gd().f();
// CHECK: call void @_ZNK1A7f_constEv
d.f_const();
// CHECK: call void @_ZN1A1fEv
(d).f();
// CHECK: call void @_ZN1A1fEv
(true, d).f();
// CHECK: call void @_ZN1D1gEv
(true, d).g();
// CHECK: call void @_ZN1A1fEv
xd.d.f();
// CHECK: call void @_ZN1A1fEv
XD().d.f();
// CHECK: call void @_ZN1A1fEv
D XD::*mp;
(xd.*mp).f();
// CHECK: call void @_ZN1D1gEv
(xd.*mp).g();
// Can't devirtualize this; we have no guarantee that p points to a D here,
// due to the "single object is considered to be an array of one element"
// rule.
// CHECK: call void %
p[0].f();
// FIXME: We can devirtualize this, by C++1z [expr.add]/6 (if the array
// element type and the pointee type are not similar, behavior is undefined).
// CHECK: call void %
p[1].f();
}
struct B {
virtual void f();
~B();
B h();
};
void f() {
// CHECK: call void @_ZN1B1fEv
B().f();
// CHECK: call void @_ZN1B1fEv
B().h().f();
}
namespace test2 {
struct foo {
virtual void f();
virtual ~foo();
};
struct bar : public foo {
virtual void f();
virtual ~bar();
};
void f(bar *b) {
// CHECK: call void @_ZN5test23foo1fEv
// CHECK: call %"struct.test2::foo"* @_ZN5test23fooD1Ev
b->foo::f();
b->foo::~foo();
}
}
namespace test3 {
// Test that we don't crash in this case.
struct B {
};
struct D : public B {
};
void f(D d) {
// CHECK-LABEL: define void @_ZN5test31fENS_1DE
d.B::~B();
}
}
namespace test4 {
struct Animal {
virtual void eat();
};
struct Fish : Animal {
virtual void eat();
};
struct Wrapper {
Fish fish;
};
extern Wrapper *p;
void test() {
// CHECK: call void @_ZN5test44Fish3eatEv
p->fish.eat();
}
}
// Do not devirtualize to pure virtual function calls.
namespace test5 {
struct X {
virtual void f() = 0;
};
struct Y {};
// CHECK-LABEL: define {{.*}} @_ZN5test51f
void f(Y &y, X Y::*p) {
// CHECK-NOT: call {{.*}} @_ZN5test51X1fEv
// CHECK: call void %
(y.*p).f();
};
struct Z final {
virtual void f() = 0;
};
// CHECK-LABEL: define {{.*}} @_ZN5test51g
void g(Z &z) {
// CHECK-NOT: call {{.*}} @_ZN5test51Z1fEv
// CHECK: call void %
z.f();
}
struct Q {
virtual void f() final = 0;
};
// CHECK-LABEL: define {{.*}} @_ZN5test51h
void h(Q &q) {
// CHECK-NOT: call {{.*}} @_ZN5test51Q1fEv
// CHECK: call void %
q.f();
}
}
|
