struct-packed-align.c revision 7d076643e77a941cd1e53ed4a328df64c88140a5 
1// RUN: clang %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
49struct as2 {
50    char c;
51    int __attribute__((aligned(8))) a;
52};
53
54extern int f1[sizeof(struct as2) == 16 ? 1 : -1];
55extern int f2[__alignof(struct as2) == 8 ? 1 : -1];
56
57struct __attribute__((packed)) as3 {
58    char c;
59    int a;
60    int __attribute__((aligned(8))) b;
61};
62
63extern int g1[sizeof(struct as3) == 16 ? 1 : -1];
64extern int g2[__alignof(struct as3) == 8 ? 1 : -1];
65
66
67// rdar://5921025
68struct packedtest {
69  int ted_likes_cheese;
70  void *args[] __attribute__((packed));
71};
72
73// Packed union
74union __attribute__((packed)) au4 {char c; int x;};
75extern int h1[sizeof(union au4) == 4 ? 1 : -1];
76extern int h2[__alignof(union au4) == 1 ? 1 : -1];
77
78// Aligned union
79union au5 {__attribute__((aligned(4))) char c;};
80extern int h1[sizeof(union au5) == 4 ? 1 : -1];
81extern int h2[__alignof(union au5) == 4 ? 1 : -1];
82
83// Alignment+packed
84struct as6 {char c; __attribute__((packed, aligned(2))) int x;};
85extern int i1[sizeof(struct as6) == 6 ? 1 : -1];
86extern int i2[__alignof(struct as6) == 2 ? 1 : -1];
87
88union au6 {char c; __attribute__((packed, aligned(2))) int x;};
89extern int k1[sizeof(union au6) == 4 ? 1 : -1];
90extern int k2[__alignof(union au6) == 2 ? 1 : -1];
91
92// Check postfix attributes
93union au7 {char c; int x;} __attribute__((packed));
94extern int l1[sizeof(union au7) == 4 ? 1 : -1];
95extern int l2[__alignof(union au7) == 1 ? 1 : -1];
96
97struct packed_fas2 {
98    char a;
99    int b[];
100} __attribute__((packed));
101
102extern int m1[sizeof(struct packed_fas2) == 1 ? 1 : -1];
103extern int m2[__alignof(struct packed_fas2) == 1 ? 1 : -1];
104