1 // run-pass
2
3 #![allow(dead_code)]
4
5 use std::mem::{size_of, align_of};
6 use std::os::raw::c_int;
7
8 // The two enums that follow are designed so that bugs trigger layout optimization.
9 // Specifically, if either of the following reprs used here is not detected by the compiler,
10 // then the sizes will be wrong.
11
12 #[repr(C, u8)]
13 enum E1 {
14 A(u8, u16, u8),
15 B(u8, u16, u8)
16 }
17
18 #[repr(u8, C)]
19 enum E2 {
20 A(u8, u16, u8),
21 B(u8, u16, u8)
22 }
23
24 // Check that repr(int) and repr(C) are in fact different from the above
25
26 #[repr(u8)]
27 enum E3 {
28 A(u8, u16, u8),
29 B(u8, u16, u8)
30 }
31
32 #[repr(u16)]
33 enum E4 {
34 A(u8, u16, u8),
35 B(u8, u16, u8)
36 }
37
38 #[repr(u32)]
39 enum E5 {
40 A(u8, u16, u8),
41 B(u8, u16, u8)
42 }
43
44 #[repr(u64)]
45 enum E6 {
46 A(u8, u16, u8),
47 B(u8, u16, u8)
48 }
49
50 #[repr(C)]
51 enum E7 {
52 A(u8, u16, u8),
53 B(u8, u16, u8)
54 }
55
56 // From pr 37429
57
58 #[repr(C,packed)]
59 pub struct p0f_api_query {
60 pub magic: u32,
61 pub addr_type: u8,
62 pub addr: [u8; 16],
63 }
64
main()65 pub fn main() {
66 assert_eq!(size_of::<E1>(), 8);
67 assert_eq!(size_of::<E2>(), 8);
68 assert_eq!(size_of::<E3>(), 6);
69 assert_eq!(size_of::<E4>(), 8);
70 assert_eq!(size_of::<E5>(), align_size(10, align_of::<u32>()));
71 assert_eq!(size_of::<E6>(), align_size(14, align_of::<u64>()));
72 assert_eq!(size_of::<E7>(), align_size(6 + size_of::<c_int>(), align_of::<c_int>()));
73 assert_eq!(size_of::<p0f_api_query>(), 21);
74 }
75
align_size(size: usize, align: usize) -> usize76 fn align_size(size: usize, align: usize) -> usize {
77 if size % align != 0 {
78 size + (align - (size % align))
79 } else {
80 size
81 }
82 }
83