skip-vtable-pointer-initialization.cpp revision ffb945ffb5d29b80fd93649c3572b6d87abce3fc 
1// RUN: %clang_cc1 %s -triple=x86_64-apple-darwin10 -emit-llvm -o - | FileCheck %s
2
3namespace Test1 {
4
5// Check that we don't initialize the vtable pointer in A::~A(), since the destructor body is trivial.
6struct A {
7  virtual void f();
8  ~A();
9};
10
11// CHECK: define void @_ZN5Test11AD2Ev
12// CHECK-NOT: store i8** getelementptr inbounds ([3 x i8*]* @_ZTVN5Test11AE, i64 0, i64 2), i8***
13A::~A()
14{
15}
16
17}
18
19namespace Test2 {
20
21// Check that we do initialize the vtable pointer in A::~A() since the destructor body isn't trivial.
22struct A {
23  virtual void f();
24  ~A();
25};
26
27// CHECK: define void @_ZN5Test21AD2Ev
28// CHECK: store i8** getelementptr inbounds ([3 x i8*]* @_ZTVN5Test21AE, i64 0, i64 2), i8***
29A::~A() {
30  f();
31}
32
33}
34
35namespace Test3 {
36
37// Check that we don't initialize the vtable pointer in A::~A(), since the destructor body is trivial
38// and Field's destructor body is also trivial.
39struct Field {
40  ~Field() { }
41};
42
43struct A {
44  virtual void f();
45  ~A();
46
47  Field field;
48};
49
50// CHECK: define void @_ZN5Test31AD2Ev
51// CHECK-NOT: store i8** getelementptr inbounds ([3 x i8*]* @_ZTVN5Test31AE, i64 0, i64 2), i8***
52A::~A() {
53
54}
55
56}
57
58namespace Test4 {
59
60// Check that we do initialize the vtable pointer in A::~A(), since Field's destructor body
61// isn't trivial.
62
63void f();
64
65struct Field {
66  ~Field() { f(); }
67};
68
69struct A {
70  virtual void f();
71  ~A();
72
73  Field field;
74};
75
76// CHECK: define void @_ZN5Test41AD2Ev
77// CHECK: store i8** getelementptr inbounds ([3 x i8*]* @_ZTVN5Test41AE, i64 0, i64 2), i8***
78A::~A()
79{
80}
81
82}
83
84namespace Test5 {
85
86// Check that we do initialize the vtable pointer in A::~A(), since Field's destructor isn't
87// available in this translation unit.
88
89struct Field {
90  ~Field();
91};
92
93struct A {
94  virtual void f();
95  ~A();
96
97  Field field;
98};
99
100// CHECK: define void @_ZN5Test51AD2Ev
101// CHECK: store i8** getelementptr inbounds ([3 x i8*]* @_ZTVN5Test51AE, i64 0, i64 2), i8***
102A::~A()
103{
104}
105
106}