struct-packed-align.c revision d7d5f0223bd30dfd618762349c6209dd1d5ea3e6 
1// RUN: clang-cc %s -fsyntax-only -verify
2
3// Packed structs.
4struct s {
5    char a;
6    int b  __attribute__((packed));
7    char c;
8    int d;
9};
10
11extern int a1[sizeof(struct s) == 12 ? 1 : -1];
12extern int a2[__alignof(struct s) == 4 ? 1 : -1];
13
14struct __attribute__((packed)) packed_s {
15    char a;
16    int b  __attribute__((packed));
17    char c;
18    int d;
19};
20
21extern int b1[sizeof(struct packed_s) == 10 ? 1 : -1];
22extern int b2[__alignof(struct packed_s) == 1 ? 1 : -1];
23
24struct fas {
25    char a;
26    int b[];
27};
28
29extern int c1[sizeof(struct fas) == 4 ? 1 : -1];
30extern int c2[__alignof(struct fas) == 4 ? 1 : -1];
31
32struct __attribute__((packed)) packed_fas {
33    char a;
34    int b[];
35};
36
37extern int d1[sizeof(struct packed_fas) == 1 ? 1 : -1];
38extern int d2[__alignof(struct packed_fas) == 1 ? 1 : -1];
39
40// Alignment
41
42struct __attribute__((aligned(8))) as1 {
43    char c;
44};
45
46extern int e1[sizeof(struct as1) == 8 ? 1 : -1];
47extern int e2[__alignof(struct as1) == 8 ? 1 : -1];
48
49// FIXME: Will need to force arch once max usable alignment isn't hard
50// coded.
51struct __attribute__((aligned)) as1_2 {
52    char c;
53};
54extern int e1_2[sizeof(struct as1_2) == 16 ? 1 : -1];
55extern int e2_2[__alignof(struct as1_2) == 16 ? 1 : -1];
56
57struct as2 {
58    char c;
59    int __attribute__((aligned(8))) a;
60};
61
62extern int f1[sizeof(struct as2) == 16 ? 1 : -1];
63extern int f2[__alignof(struct as2) == 8 ? 1 : -1];
64
65struct __attribute__((packed)) as3 {
66    char c;
67    int a;
68    int __attribute__((aligned(8))) b;
69};
70
71extern int g1[sizeof(struct as3) == 16 ? 1 : -1];
72extern int g2[__alignof(struct as3) == 8 ? 1 : -1];
73
74
75// rdar://5921025
76struct packedtest {
77  int ted_likes_cheese;
78  void *args[] __attribute__((packed));
79};
80
81// Packed union
82union __attribute__((packed)) au4 {char c; int x;};
83extern int h1[sizeof(union au4) == 4 ? 1 : -1];
84extern int h2[__alignof(union au4) == 1 ? 1 : -1];
85
86// Aligned union
87union au5 {__attribute__((aligned(4))) char c;};
88extern int h1[sizeof(union au5) == 4 ? 1 : -1];
89extern int h2[__alignof(union au5) == 4 ? 1 : -1];
90
91// Alignment+packed
92struct as6 {char c; __attribute__((packed, aligned(2))) int x;};
93extern int i1[sizeof(struct as6) == 6 ? 1 : -1];
94extern int i2[__alignof(struct as6) == 2 ? 1 : -1];
95
96union au6 {char c; __attribute__((packed, aligned(2))) int x;};
97extern int k1[sizeof(union au6) == 4 ? 1 : -1];
98extern int k2[__alignof(union au6) == 2 ? 1 : -1];
99
100// Check postfix attributes
101union au7 {char c; int x;} __attribute__((packed));
102extern int l1[sizeof(union au7) == 4 ? 1 : -1];
103extern int l2[__alignof(union au7) == 1 ? 1 : -1];
104
105struct packed_fas2 {
106    char a;
107    int b[];
108} __attribute__((packed));
109
110extern int m1[sizeof(struct packed_fas2) == 1 ? 1 : -1];
111extern int m2[__alignof(struct packed_fas2) == 1 ? 1 : -1];
112