87 lines
2.3 KiB
Rust
87 lines
2.3 KiB
Rust
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// 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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// Issue #21486: Make sure that all structures are dropped, even when
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// created via FRU and control-flow breaks in the middle of
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// construction.
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use std::sync::atomic::{Ordering, AtomicUsize, ATOMIC_USIZE_INIT};
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#[derive(Debug)]
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struct Noisy(u8);
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impl Drop for Noisy {
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fn drop(&mut self) {
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// println!("splat #{}", self.0);
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event(self.0);
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}
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}
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#[allow(dead_code)]
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#[derive(Debug)]
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struct Foo { n0: Noisy, n1: Noisy }
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impl Foo {
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fn vals(&self) -> (u8, u8) { (self.n0.0, self.n1.0) }
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}
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fn leak_1_ret() -> Foo {
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let _old_foo = Foo { n0: Noisy(1), n1: Noisy(2) };
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Foo { n0: { return Foo { n0: Noisy(3), n1: Noisy(4) } },
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.._old_foo
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};
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}
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fn leak_2_ret() -> Foo {
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let _old_foo = Foo { n0: Noisy(1), n1: Noisy(2) };
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Foo { n1: { return Foo { n0: Noisy(3), n1: Noisy(4) } },
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.._old_foo
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};
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}
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// In this case, the control flow break happens *before* we construct
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// `Foo(Noisy(1),Noisy(2))`, so there should be no record of it in the
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// event log.
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fn leak_3_ret() -> Foo {
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let _old_foo = || Foo { n0: Noisy(1), n1: Noisy(2) };
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Foo { n1: { return Foo { n0: Noisy(3), n1: Noisy(4) } },
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.._old_foo()
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};
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}
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pub fn main() {
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reset_log();
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assert_eq!(leak_1_ret().vals(), (3,4));
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assert_eq!(0x01_02_03_04, event_log());
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reset_log();
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assert_eq!(leak_2_ret().vals(), (3,4));
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assert_eq!(0x01_02_03_04, event_log());
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reset_log();
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assert_eq!(leak_3_ret().vals(), (3,4));
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assert_eq!(0x03_04, event_log());
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}
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static LOG: AtomicUsize = ATOMIC_USIZE_INIT;
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fn reset_log() {
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LOG.store(0, Ordering::SeqCst);
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}
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fn event_log() -> usize {
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LOG.load(Ordering::SeqCst)
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}
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fn event(tag: u8) {
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let old_log = LOG.load(Ordering::SeqCst);
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let new_log = (old_log << 8) + tag as usize;
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LOG.store(new_log, Ordering::SeqCst);
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}
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