mirror of https://github.com/rust-lang/rust
78 lines
1.8 KiB
Rust
78 lines
1.8 KiB
Rust
//@ run-pass
|
|
#![allow(unreachable_code)]
|
|
// 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};
|
|
|
|
#[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 = AtomicUsize::new(0);
|
|
|
|
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);
|
|
}
|