anonymous-union-member-initializer.cpp revision 4955e57cd5de1e47be4e2f3e6c733beac166bbd8 
1// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -o - %s | FileCheck %s
2
3// rdar://8818236
4namespace rdar8818236 {
5struct S {
6  char c2;
7  union {
8    char c;
9    int i;
10  };
11};
12
13// CHECK: @_ZN11rdar88182363fooE = global i64 4
14char S::*foo  = &S::c;
15}
16
17struct A {
18  union {
19    int a;
20    void* b;
21  };
22
23  A() : a(0) { }
24};
25
26A a;
27
28namespace PR7021 {
29  struct X
30  {
31    union { long l; };
32  };
33
34  // CHECK: define void @_ZN6PR70211fENS_1XES0_
35  void f(X x, X z) {
36    X x1;
37
38    // CHECK: store i64 1, i64
39    x1.l = 1;
40
41    // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64
42    X x2(x1);
43
44    X x3;
45    // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64
46    x3 = x1;
47
48    // CHECK: ret void
49  }
50}
51
52namespace test2 {
53  struct A {
54    struct {
55      union {
56        int b;
57      };
58    };
59
60    A();
61  };
62
63  A::A() : b(10) { }
64  // CHECK: define void @_ZN5test21AC2Ev(
65  // CHECK-NOT: }
66  // CHECK: store i32 10
67  // CHECK: }
68}
69
70namespace test3 {
71  struct A {
72    union {
73      mutable char fibers[100];
74      struct {
75        void (*callback)(void*);
76        void *callback_value;
77      };
78    };
79
80    A();
81  };
82
83  A::A() : callback(0), callback_value(0) {}
84  // CHECK: define void @_ZN5test31AC2Ev(
85  // CHECK: [[THIS:%.*]] = load
86  // CHECK-NEXT: [[UNION:%.*]] = getelementptr inbounds {{.*}} [[THIS]], i32 0, i32 0
87  // CHECK-NEXT: [[STRUCT:%.*]] = bitcast {{.*}}* [[UNION]] to
88  // CHECK-NEXT: [[CALLBACK:%.*]] = getelementptr inbounds {{.*}} [[STRUCT]], i32 0, i32 0
89  // CHECK-NEXT: store void (i8*)* null, void (i8*)** [[CALLBACK]]
90  // CHECK-NEXT: [[UNION:%.*]] = getelementptr inbounds {{.*}} [[THIS]], i32 0, i32 0
91  // CHECK-NEXT: [[STRUCT:%.*]] = bitcast {{.*}}* [[UNION]] to
92  // CHECK-NEXT: [[CVALUE:%.*]] = getelementptr inbounds {{.*}} [[STRUCT]], i32 0, i32 1
93  // CHECK-NEXT: store i8* null, i8** [[CVALUE]]
94}
95
96struct S {
97  // CHECK: store i32 42
98  // CHECK: store i32 55
99  S() : x(42), y(55) {}
100  union {
101    struct {
102      int x;
103      union { int y; };
104    };
105  };
106} s;
107
108
109//PR8760
110template <typename T> struct Foo {
111  Foo() : ptr(__nullptr) {}
112  union {
113    T *ptr;
114  };
115};
116Foo<int> f;
117