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