1 // RUN: %clang_cc1 -triple i386-unknown-unknown %s -emit-llvm -o - | FileCheck %s
2
3 struct foo {
4 void *a;
5 int b;
6 };
7
8 // CHECK: @u = global %union.anon zeroinitializer
9 union { int i; float f; } u = { };
10
11 // CHECK: @u2 = global { i32, [4 x i8] } { i32 0, [4 x i8] undef }
12 union { int i; double f; } u2 = { };
13
14 // CHECK: @u3 = global %union.anon.1 zeroinitializer
15 union { double f; int i; } u3 = { };
16
17 // CHECK: @b = global [2 x i32] [i32 0, i32 22]
18 int b[2] = {
19 [1] = 22
20 };
21
22 // PR6955
23
24 struct ds {
25 struct {
26 struct {
27 short a;
28 };
29 short b;
30 struct {
31 short c;
32 };
33 };
34 };
35
36 // Traditional C anonymous member init
37 struct ds ds0 = { { { .a = 0 } } };
38 // C1X lookup-based anonymous member init cases
39 struct ds ds1 = { { .a = 1 } };
40 struct ds ds2 = { { .b = 1 } };
41 struct ds ds3 = { .a = 0 };
42 // CHECK: @ds4 = global %struct.ds { %struct.anon.3 { %struct.anon zeroinitializer, i16 0, %struct.anon.2 { i16 1 } } }
43 struct ds ds4 = { .c = 1 };
44 struct ds ds5 = { { { .a = 0 } }, .b = 1 };
45 struct ds ds6 = { { .a = 0, .b = 1 } };
46 // CHECK: @ds7 = global %struct.ds { %struct.anon.3 { %struct.anon { i16 2 }, i16 3, %struct.anon.2 zeroinitializer } }
47 struct ds ds7 = {
48 { {
49 .a = 1
50 } },
51 .a = 2,
52 .b = 3
53 };
54
55
56 // <rdar://problem/10465114>
57 struct overwrite_string_struct1 {
58 __typeof(L"foo"[0]) L[6];
59 int M;
60 } overwrite_string1[] = { { { L"foo" }, 1 }, [0].L[2] = L'x'};
61 // CHECK: [6 x i32] [i32 102, i32 111, i32 120, i32 0, i32 0, i32 0], i32 1
62 struct overwrite_string_struct2 {
63 char L[6];
64 int M;
65 } overwrite_string2[] = { { { "foo" }, 1 }, [0].L[2] = 'x'};
66 // CHECK: [6 x i8] c"fox\00\00\00", i32 1
67 struct overwrite_string_struct3 {
68 char L[3];
69 int M;
70 } overwrite_string3[] = { { { "foo" }, 1 }, [0].L[2] = 'x'};
71 // CHECK: [3 x i8] c"fox", i32 1
72 struct overwrite_string_struct4 {
73 char L[3];
74 int M;
75 } overwrite_string4[] = { { { "foobar" }, 1 }, [0].L[2] = 'x'};
76 // CHECK: [3 x i8] c"fox", i32 1
77 struct overwrite_string_struct5 {
78 char L[6];
79 int M;
80 } overwrite_string5[] = { { { "foo" }, 1 }, [0].L[4] = 'y'};
81 // CHECK: [6 x i8] c"foo\00y\00", i32 1
82
83
84 // CHECK: @u1 = {{.*}} { i32 65535 }
85 union u_FFFF { char c; long l; } u1 = { .l = 0xFFFF };
86
87
88 /// PR16644
89 typedef union u_16644 {
90 struct s_16644 {
91 int zero;
92 int one;
93 int two;
94 int three;
95 } a;
96 int b[4];
97 } union_16644_t;
98
99 // CHECK: @union_16644_instance_0 = {{.*}} { i32 0, i32 0, i32 0, i32 3 } }
100 union_16644_t union_16644_instance_0 =
101 {
102 .b[0] = 0,
103 .a.one = 1,
104 .b[2] = 2,
105 .a.three = 3,
106 };
107
108 // CHECK: @union_16644_instance_1 = {{.*}} [i32 10, i32 0, i32 0, i32 0]
109 union_16644_t union_16644_instance_1 =
110 {
111 .a.three = 13,
112 .b[2] = 12,
113 .a.one = 11,
114 .b[0] = 10,
115 };
116
117 // CHECK: @union_16644_instance_2 = {{.*}} [i32 0, i32 20, i32 0, i32 0]
118 union_16644_t union_16644_instance_2 =
119 {
120 .a.one = 21,
121 .b[1] = 20,
122 };
123
124 // CHECK: @union_16644_instance_3 = {{.*}} { i32 0, i32 31, i32 0, i32 0 }
125 union_16644_t union_16644_instance_3 =
126 {
127 .b[1] = 30,
128 .a = {
129 .one = 31
130 }
131 };
132
133 // CHECK: @union_16644_instance_4 = {{.*}} { i32 5, i32 2, i32 0, i32 0 } {{.*}} [i32 0, i32 4, i32 0, i32 0]
134 union_16644_t union_16644_instance_4[2] =
135 {
136 [0].a.one = 2,
137 [1].a.zero = 3,
138 [0].a.zero = 5,
139 [1].b[1] = 4
140 };
141
142 // CHECK: @lab = global { [4 x i8], i32 } { [4 x i8] undef, i32 123 }
143 struct leading_anon_bitfield { int : 32; int n; } lab = { .n = 123 };
144
test1(int argc,char ** argv)145 void test1(int argc, char **argv)
146 {
147 // CHECK: internal global %struct.foo { i8* null, i32 1024 }
148 static struct foo foo = {
149 .b = 1024,
150 };
151
152 // CHECK: bitcast %union.anon.4* %u2
153 // CHECK: call void @llvm.memset
154 union { int i; float f; } u2 = { };
155
156 // CHECK-NOT: call void @llvm.memset
157 union { int i; float f; } u3;
158
159 // CHECK: ret void
160 }
161
162
163 // PR7151
164 struct S {
165 int nkeys;
166 int *keys;
167 union {
168 void *data;
169 };
170 };
171
test2()172 void test2() {
173 struct S *btkr;
174
175 *btkr = (struct S) {
176 .keys = 0,
177 { .data = 0 },
178 };
179 }
180