src/test/run-pass/issue-29663.rs

   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
  13 #![feature(volatile)]
  14 use std::ptr::{read_volatile, write_volatile};
  15
  16 #[derive(Debug, Eq, PartialEq)]
  17 struct A(u32);
  18 #[derive(Debug, Eq, PartialEq)]
  19 struct B(u64);
  20 #[derive(Debug, Eq, PartialEq)]
  21 struct C(u32, u32);
  22 #[derive(Debug, Eq, PartialEq)]
  23 struct D(u64, u64);
  24 #[derive(Debug, Eq, PartialEq)]
  25 struct E([u64; 32]);
  26
  27 fn main() {
  28     unsafe {
  29         let mut x: u32 = 0;
  30         write_volatile(&mut x, 1);
  31         assert_eq!(read_volatile(&x), 1);
  32         assert_eq!(x, 1);
  33
  34         let mut x: u64 = 0;
  35         write_volatile(&mut x, 1);
  36         assert_eq!(read_volatile(&x), 1);
  37         assert_eq!(x, 1);
  38
  39         let mut x = A(0);
  40         write_volatile(&mut x, A(1));
  41         assert_eq!(read_volatile(&x), A(1));
  42         assert_eq!(x, A(1));
  43
  44         let mut x = B(0);
  45         write_volatile(&mut x, B(1));
  46         assert_eq!(read_volatile(&x), B(1));
  47         assert_eq!(x, B(1));
  48
  49         let mut x = C(0, 0);
  50         write_volatile(&mut x, C(1, 1));
  51         assert_eq!(read_volatile(&x), C(1, 1));
  52         assert_eq!(x, C(1, 1));
  53
  54         let mut x = D(0, 0);
  55         write_volatile(&mut x, D(1, 1));
  56         assert_eq!(read_volatile(&x), D(1, 1));
  57         assert_eq!(x, D(1, 1));
  58
  59         let mut x = E([0; 32]);
  60         write_volatile(&mut x, E([1; 32]));
  61         assert_eq!(read_volatile(&x), E([1; 32]));
  62         assert_eq!(x, E([1; 32]));
  63     }
  64 }