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1 | // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | // write_volatile causes an LLVM assert with composite types | |
12 | ||
7cac9316 XL |
13 | // ignore-emscripten See #41299: probably a bad optimization |
14 | ||
54a0048b SL |
15 | #![feature(volatile)] |
16 | use std::ptr::{read_volatile, write_volatile}; | |
17 | ||
18 | #[derive(Debug, Eq, PartialEq)] | |
19 | struct A(u32); | |
20 | #[derive(Debug, Eq, PartialEq)] | |
21 | struct B(u64); | |
22 | #[derive(Debug, Eq, PartialEq)] | |
23 | struct C(u32, u32); | |
24 | #[derive(Debug, Eq, PartialEq)] | |
25 | struct D(u64, u64); | |
26 | #[derive(Debug, Eq, PartialEq)] | |
27 | struct E([u64; 32]); | |
28 | ||
29 | fn main() { | |
30 | unsafe { | |
31 | let mut x: u32 = 0; | |
32 | write_volatile(&mut x, 1); | |
33 | assert_eq!(read_volatile(&x), 1); | |
34 | assert_eq!(x, 1); | |
35 | ||
36 | let mut x: u64 = 0; | |
37 | write_volatile(&mut x, 1); | |
38 | assert_eq!(read_volatile(&x), 1); | |
39 | assert_eq!(x, 1); | |
40 | ||
41 | let mut x = A(0); | |
42 | write_volatile(&mut x, A(1)); | |
43 | assert_eq!(read_volatile(&x), A(1)); | |
44 | assert_eq!(x, A(1)); | |
45 | ||
46 | let mut x = B(0); | |
47 | write_volatile(&mut x, B(1)); | |
48 | assert_eq!(read_volatile(&x), B(1)); | |
49 | assert_eq!(x, B(1)); | |
50 | ||
51 | let mut x = C(0, 0); | |
52 | write_volatile(&mut x, C(1, 1)); | |
53 | assert_eq!(read_volatile(&x), C(1, 1)); | |
54 | assert_eq!(x, C(1, 1)); | |
55 | ||
56 | let mut x = D(0, 0); | |
57 | write_volatile(&mut x, D(1, 1)); | |
58 | assert_eq!(read_volatile(&x), D(1, 1)); | |
59 | assert_eq!(x, D(1, 1)); | |
60 | ||
61 | let mut x = E([0; 32]); | |
62 | write_volatile(&mut x, E([1; 32])); | |
63 | assert_eq!(read_volatile(&x), E([1; 32])); | |
64 | assert_eq!(x, E([1; 32])); | |
65 | } | |
66 | } |