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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Issue #21486: Make sure that all structures are dropped, even when
// created via FRU and control-flow breaks in the middle of
// construction.
use std::sync::atomic::{Ordering, AtomicUsize, ATOMIC_USIZE_INIT};
#[derive(Debug)]
struct Noisy(u8);
impl Drop for Noisy {
fn drop(&mut self) {
// println!("splat #{}", self.0);
event(self.0);
}
}
#[allow(dead_code)]
#[derive(Debug)]
struct Foo { n0: Noisy, n1: Noisy }
impl Foo {
fn vals(&self) -> (u8, u8) { (self.n0.0, self.n1.0) }
}
fn leak_1_ret() -> Foo {
let _old_foo = Foo { n0: Noisy(1), n1: Noisy(2) };
Foo { n0: { return Foo { n0: Noisy(3), n1: Noisy(4) } },
.._old_foo
};
}
fn leak_2_ret() -> Foo {
let _old_foo = Foo { n0: Noisy(1), n1: Noisy(2) };
Foo { n1: { return Foo { n0: Noisy(3), n1: Noisy(4) } },
.._old_foo
};
}
// In this case, the control flow break happens *before* we construct
// `Foo(Noisy(1),Noisy(2))`, so there should be no record of it in the
// event log.
fn leak_3_ret() -> Foo {
let _old_foo = || Foo { n0: Noisy(1), n1: Noisy(2) };
Foo { n1: { return Foo { n0: Noisy(3), n1: Noisy(4) } },
.._old_foo()
};
}
pub fn main() {
reset_log();
assert_eq!(leak_1_ret().vals(), (3,4));
assert_eq!(0x01_02_03_04, event_log());
reset_log();
assert_eq!(leak_2_ret().vals(), (3,4));
assert_eq!(0x01_02_03_04, event_log());
reset_log();
assert_eq!(leak_3_ret().vals(), (3,4));
assert_eq!(0x03_04, event_log());
}
static LOG: AtomicUsize = ATOMIC_USIZE_INIT;
fn reset_log() {
LOG.store(0, Ordering::SeqCst);
}
fn event_log() -> usize {
LOG.load(Ordering::SeqCst)
}
fn event(tag: u8) {
let old_log = LOG.load(Ordering::SeqCst);
let new_log = (old_log << 8) + tag as usize;
LOG.store(new_log, Ordering::SeqCst);
}
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