68 lines
2.2 KiB
Rust
68 lines
2.2 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// compile-flags: -Z force-dropflag-checks=on
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// Quick-and-dirty test to ensure -Z force-dropflag-checks=on works as
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// expected. Note that the inlined drop-flag is slated for removal
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// (RFC 320); when that happens, the -Z flag and this test should
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// simply be removed.
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//
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// See also drop-flag-skip-sanity-check.rs.
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use std::env;
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use std::process::Command;
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fn main() {
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let args: Vec<String> = env::args().collect();
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if args.len() > 1 && args[1] == "test" {
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return test();
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}
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let mut p = Command::new(&args[0]).arg("test").spawn().unwrap();
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// The invocation should fail due to the drop-flag sanity check.
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assert!(!p.wait().unwrap().success());
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}
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#[derive(Debug)]
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struct Corrupted {
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x: u8
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}
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impl Drop for Corrupted {
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fn drop(&mut self) { println!("dropping"); }
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}
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fn test() {
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{
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let mut c1 = Corrupted { x: 1 };
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let mut c2 = Corrupted { x: 2 };
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unsafe {
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let p1 = &mut c1 as *mut Corrupted as *mut u8;
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let p2 = &mut c2 as *mut Corrupted as *mut u8;
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for i in 0..std::mem::size_of::<Corrupted>() {
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// corrupt everything, *including the drop flag.
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//
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// (We corrupt via two different means to safeguard
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// against the hypothetical assignment of the
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// dtor_needed/dtor_done values to v and v+k. that
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// happen to match with one of the corruption values
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// below.)
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*p1.offset(i as isize) += 2;
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*p2.offset(i as isize) += 3;
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}
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}
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// Here, at the end of the scope of `c1` and `c2`, the
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// drop-glue should detect the corruption of (at least one of)
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// the drop-flags.
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}
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println!("We should never get here.");
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}
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