mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-30 10:45:18 +00:00
84 lines
2.8 KiB
Rust
84 lines
2.8 KiB
Rust
// run-pass
|
|
// needs-unwind
|
|
// ignore-emscripten no threads support
|
|
|
|
// rust-lang/rust#64655: with panic=unwind, a panic from a subroutine
|
|
// should still run destructors as it unwinds the stack. However,
|
|
// bugs with how the nounwind LLVM attribute was applied led to this
|
|
// simple case being mishandled *if* you had optimization *and* fat
|
|
// LTO turned on.
|
|
|
|
// This test is the closest thing to a "regression test" we can do
|
|
// without actually spawning subprocesses and comparing stderr
|
|
// results.
|
|
//
|
|
// This test takes the code from the above issue and adapts it to
|
|
// better fit our test infrastructure:
|
|
//
|
|
// * Instead of relying on `println!` to observe whether the destructor
|
|
// is run, we instead run the code in a spawned thread and
|
|
// communicate the destructor's operation via a synchronous atomic
|
|
// in static memory.
|
|
//
|
|
// * To keep the output from confusing a casual user, we override the
|
|
// panic hook to be a no-op (rather than printing a message to
|
|
// stderr).
|
|
//
|
|
// (pnkfelix has confirmed by hand that these additions do not mask
|
|
// the underlying bug.)
|
|
|
|
// LTO settings cannot be combined with -C prefer-dynamic
|
|
// no-prefer-dynamic
|
|
|
|
// The revisions combine each lto setting with each optimization
|
|
// setting; pnkfelix observed three differing behaviors at opt-levels
|
|
// 0/1/2+3 for this test, so it seems prudent to be thorough.
|
|
|
|
// revisions: no0 no1 no2 no3 thin0 thin1 thin2 thin3 fat0 fat1 fat2 fat3
|
|
|
|
//[no0]compile-flags: -C opt-level=0 -C lto=no
|
|
//[no1]compile-flags: -C opt-level=1 -C lto=no
|
|
//[no2]compile-flags: -C opt-level=2 -C lto=no
|
|
//[no3]compile-flags: -C opt-level=3 -C lto=no
|
|
//[thin0]compile-flags: -C opt-level=0 -C lto=thin
|
|
//[thin1]compile-flags: -C opt-level=1 -C lto=thin
|
|
//[thin2]compile-flags: -C opt-level=2 -C lto=thin
|
|
//[thin3]compile-flags: -C opt-level=3 -C lto=thin
|
|
//[fat0]compile-flags: -C opt-level=0 -C lto=fat
|
|
//[fat1]compile-flags: -C opt-level=1 -C lto=fat
|
|
//[fat2]compile-flags: -C opt-level=2 -C lto=fat
|
|
//[fat3]compile-flags: -C opt-level=3 -C lto=fat
|
|
|
|
fn main() {
|
|
use std::sync::atomic::{AtomicUsize, Ordering};
|
|
|
|
static SHARED: AtomicUsize = AtomicUsize::new(0);
|
|
|
|
assert_eq!(SHARED.fetch_add(0, Ordering::SeqCst), 0);
|
|
|
|
let old_hook = std::panic::take_hook();
|
|
|
|
std::panic::set_hook(Box::new(|_| { } )); // no-op on panic.
|
|
|
|
let handle = std::thread::spawn(|| {
|
|
struct Droppable;
|
|
impl Drop for Droppable {
|
|
fn drop(&mut self) {
|
|
SHARED.fetch_add(1, Ordering::SeqCst);
|
|
}
|
|
}
|
|
|
|
let _guard = Droppable;
|
|
None::<()>.expect("???");
|
|
});
|
|
|
|
let wait = handle.join();
|
|
|
|
// reinstate handler to ease observation of assertion failures.
|
|
std::panic::set_hook(old_hook);
|
|
|
|
assert!(wait.is_err());
|
|
|
|
assert_eq!(SHARED.fetch_add(0, Ordering::SeqCst), 1);
|
|
}
|