1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
//@ run-pass
#![allow(dead_code)]
#![allow(unused_unsafe)]
// Issue #2303
#![feature(core_intrinsics, rustc_attrs)]
use std::mem;
use std::intrinsics;
// This is the type with the questionable alignment
#[derive(Debug)]
struct Inner {
c64: u32
}
// This is the type that contains the type with the
// questionable alignment, for testing
#[derive(Debug)]
struct Outer {
c8: u8,
t: Inner
}
mod m {
pub fn align() -> usize { 4 }
pub fn size() -> usize { 8 }
}
pub fn main() {
unsafe {
let x = Outer {c8: 22, t: Inner {c64: 44}};
// Send it through the shape code
let y = format!("{:?}", x);
println!("align inner = {:?}", intrinsics::min_align_of::<Inner>());
println!("size outer = {:?}", mem::size_of::<Outer>());
println!("y = {:?}", y);
// per clang/gcc the alignment of `inner` is 4 on x86.
assert_eq!(intrinsics::min_align_of::<Inner>(), m::align());
// per clang/gcc the size of `outer` should be 12
// because `inner`s alignment was 4.
assert_eq!(mem::size_of::<Outer>(), m::size());
assert_eq!(y, "Outer { c8: 22, t: Inner { c64: 44 } }".to_string());
}
}
|
