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1 | // Copyright 2015 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 | // compile-flags: -Z force-dropflag-checks=on | |
5bcae85e | 12 | // ignore-emscripten |
c34b1796 AL |
13 | |
14 | // Quick-and-dirty test to ensure -Z force-dropflag-checks=on works as | |
15 | // expected. Note that the inlined drop-flag is slated for removal | |
16 | // (RFC 320); when that happens, the -Z flag and this test should | |
17 | // simply be removed. | |
18 | // | |
19 | // See also drop-flag-skip-sanity-check.rs. | |
20 | ||
c34b1796 | 21 | use std::env; |
9346a6ac | 22 | use std::process::Command; |
c34b1796 AL |
23 | |
24 | fn main() { | |
25 | let args: Vec<String> = env::args().collect(); | |
26 | if args.len() > 1 && args[1] == "test" { | |
27 | return test(); | |
28 | } | |
29 | ||
30 | let mut p = Command::new(&args[0]).arg("test").spawn().unwrap(); | |
31 | // The invocation should fail due to the drop-flag sanity check. | |
32 | assert!(!p.wait().unwrap().success()); | |
33 | } | |
34 | ||
35 | #[derive(Debug)] | |
36 | struct Corrupted { | |
37 | x: u8 | |
38 | } | |
39 | ||
40 | impl Drop for Corrupted { | |
41 | fn drop(&mut self) { println!("dropping"); } | |
42 | } | |
43 | ||
44 | fn test() { | |
45 | { | |
46 | let mut c1 = Corrupted { x: 1 }; | |
47 | let mut c2 = Corrupted { x: 2 }; | |
48 | unsafe { | |
49 | let p1 = &mut c1 as *mut Corrupted as *mut u8; | |
50 | let p2 = &mut c2 as *mut Corrupted as *mut u8; | |
51 | for i in 0..std::mem::size_of::<Corrupted>() { | |
52 | // corrupt everything, *including the drop flag. | |
53 | // | |
54 | // (We corrupt via two different means to safeguard | |
55 | // against the hypothetical assignment of the | |
56 | // dtor_needed/dtor_done values to v and v+k. that | |
57 | // happen to match with one of the corruption values | |
58 | // below.) | |
59 | *p1.offset(i as isize) += 2; | |
60 | *p2.offset(i as isize) += 3; | |
61 | } | |
62 | } | |
63 | // Here, at the end of the scope of `c1` and `c2`, the | |
64 | // drop-glue should detect the corruption of (at least one of) | |
65 | // the drop-flags. | |
66 | } | |
67 | println!("We should never get here."); | |
68 | } |