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Diffstat (limited to 'tests/ui/drop/dynamic-drop.rs')
| -rw-r--r-- | tests/ui/drop/dynamic-drop.rs | 520 |
1 files changed, 520 insertions, 0 deletions
diff --git a/tests/ui/drop/dynamic-drop.rs b/tests/ui/drop/dynamic-drop.rs new file mode 100644 index 00000000000..9e51d3adaaa --- /dev/null +++ b/tests/ui/drop/dynamic-drop.rs @@ -0,0 +1,520 @@ +// run-pass +// needs-unwind + +#![feature(generators, generator_trait)] + +#![allow(unused_assignments)] +#![allow(unused_variables)] + +use std::cell::{Cell, RefCell}; +use std::mem::ManuallyDrop; +use std::ops::Generator; +use std::panic; +use std::pin::Pin; + +struct InjectedFailure; + +struct Allocator { + data: RefCell<Vec<bool>>, + failing_op: usize, + cur_ops: Cell<usize>, +} + +impl panic::UnwindSafe for Allocator {} +impl panic::RefUnwindSafe for Allocator {} + +impl Drop for Allocator { + fn drop(&mut self) { + let data = self.data.borrow(); + if data.iter().any(|d| *d) { + panic!("missing free: {:?}", data); + } + } +} + +impl Allocator { + fn new(failing_op: usize) -> Self { + Allocator { + failing_op: failing_op, + cur_ops: Cell::new(0), + data: RefCell::new(vec![]) + } + } + fn alloc(&self) -> Ptr<'_> { + self.cur_ops.set(self.cur_ops.get() + 1); + + if self.cur_ops.get() == self.failing_op { + panic::panic_any(InjectedFailure); + } + + let mut data = self.data.borrow_mut(); + let addr = data.len(); + data.push(true); + Ptr(addr, self) + } + // FIXME(#47949) Any use of this indicates a bug in rustc: we should never + // be leaking values in the cases here. + // + // Creates a `Ptr<'_>` and checks that the allocated value is leaked if the + // `failing_op` is in the list of exception. + fn alloc_leaked(&self, exceptions: Vec<usize>) -> Ptr<'_> { + let ptr = self.alloc(); + + if exceptions.iter().any(|operation| *operation == self.failing_op) { + let mut data = self.data.borrow_mut(); + data[ptr.0] = false; + } + ptr + } +} + +struct Ptr<'a>(usize, &'a Allocator); +impl<'a> Drop for Ptr<'a> { + fn drop(&mut self) { + match self.1.data.borrow_mut()[self.0] { + false => { + panic!("double free at index {:?}", self.0) + } + ref mut d => *d = false + } + + self.1.cur_ops.set(self.1.cur_ops.get()+1); + + if self.1.cur_ops.get() == self.1.failing_op { + panic::panic_any(InjectedFailure); + } + } +} + +fn dynamic_init(a: &Allocator, c: bool) { + let _x; + if c { + _x = Some(a.alloc()); + } +} + +fn dynamic_drop(a: &Allocator, c: bool) { + let x = a.alloc(); + if c { + Some(x) + } else { + None + }; +} + +struct TwoPtrs<'a>(Ptr<'a>, #[allow(unused_tuple_struct_fields)] Ptr<'a>); +fn struct_dynamic_drop(a: &Allocator, c0: bool, c1: bool, c: bool) { + for i in 0..2 { + let x; + let y; + if (c0 && i == 0) || (c1 && i == 1) { + x = (a.alloc(), a.alloc(), a.alloc()); + y = TwoPtrs(a.alloc(), a.alloc()); + if c { + drop(x.1); + drop(y.0); + } + } + } +} + +fn field_assignment(a: &Allocator, c0: bool) { + let mut x = (TwoPtrs(a.alloc(), a.alloc()), a.alloc()); + + x.1 = a.alloc(); + x.1 = a.alloc(); + + let f = (x.0).0; + if c0 { + (x.0).0 = f; + } +} + +fn assignment2(a: &Allocator, c0: bool, c1: bool) { + let mut _v = a.alloc(); + let mut _w = a.alloc(); + if c0 { + drop(_v); + } + _v = _w; + if c1 { + _w = a.alloc(); + } +} + +fn assignment1(a: &Allocator, c0: bool) { + let mut _v = a.alloc(); + let mut _w = a.alloc(); + if c0 { + drop(_v); + } + _v = _w; +} + +union Boxy<T> { + a: ManuallyDrop<T>, + b: ManuallyDrop<T>, +} + +fn union1(a: &Allocator) { + unsafe { + let mut u = Boxy { a: ManuallyDrop::new(a.alloc()) }; + *u.b = a.alloc(); // drops first alloc + drop(ManuallyDrop::into_inner(u.a)); + } +} + +fn array_simple(a: &Allocator) { + let _x = [a.alloc(), a.alloc(), a.alloc(), a.alloc()]; +} + +fn vec_simple(a: &Allocator) { + let _x = vec![a.alloc(), a.alloc(), a.alloc(), a.alloc()]; +} + +fn generator(a: &Allocator, run_count: usize) { + assert!(run_count < 4); + + let mut gen = || { + (a.alloc(), + yield a.alloc(), + a.alloc(), + yield a.alloc() + ); + }; + for _ in 0..run_count { + Pin::new(&mut gen).resume(()); + } +} + +fn mixed_drop_and_nondrop(a: &Allocator) { + // check that destructor panics handle drop + // and non-drop blocks in the same scope correctly. + // + // Surprisingly enough, this used to not work. + let (x, y, z); + x = a.alloc(); + y = 5; + z = a.alloc(); +} + +#[allow(unreachable_code)] +fn vec_unreachable(a: &Allocator) { + let _x = vec![a.alloc(), a.alloc(), a.alloc(), return]; +} + +fn slice_pattern_first(a: &Allocator) { + let[_x, ..] = [a.alloc(), a.alloc(), a.alloc()]; +} + +fn slice_pattern_middle(a: &Allocator) { + let[_, _x, _] = [a.alloc(), a.alloc(), a.alloc()]; +} + +fn slice_pattern_two(a: &Allocator) { + let[_x, _, _y, _] = [a.alloc(), a.alloc(), a.alloc(), a.alloc()]; +} + +fn slice_pattern_last(a: &Allocator) { + let[.., _y] = [a.alloc(), a.alloc(), a.alloc(), a.alloc()]; +} + +fn slice_pattern_one_of(a: &Allocator, i: usize) { + let array = [a.alloc(), a.alloc(), a.alloc(), a.alloc()]; + let _x = match i { + 0 => { let [a, ..] = array; a } + 1 => { let [_, a, ..] = array; a } + 2 => { let [_, _, a, _] = array; a } + 3 => { let [_, _, _, a] = array; a } + _ => panic!("unmatched"), + }; +} + +fn subslice_pattern_from_end(a: &Allocator, arg: bool) { + let a = [a.alloc(), a.alloc(), a.alloc()]; + if arg { + let[.., _x, _] = a; + } else { + let[_, _y @ ..] = a; + } +} + +fn subslice_pattern_from_end_with_drop(a: &Allocator, arg: bool, arg2: bool) { + let a = [a.alloc(), a.alloc(), a.alloc(), a.alloc(), a.alloc()]; + if arg2 { + drop(a); + return; + } + + if arg { + let[.., _x, _] = a; + } else { + let[_, _y @ ..] = a; + } +} + +fn slice_pattern_reassign(a: &Allocator) { + let mut ar = [a.alloc(), a.alloc()]; + let[_, _x] = ar; + ar = [a.alloc(), a.alloc()]; + let[.., _y] = ar; +} + +fn subslice_pattern_reassign(a: &Allocator) { + let mut ar = [a.alloc(), a.alloc(), a.alloc()]; + let[_, _, _x] = ar; + ar = [a.alloc(), a.alloc(), a.alloc()]; + let[_, _y @ ..] = ar; +} + +fn index_field_mixed_ends(a: &Allocator) { + let ar = [(a.alloc(), a.alloc()), (a.alloc(), a.alloc())]; + let[(_x, _), ..] = ar; + let[(_, _y), _] = ar; + let[_, (_, _w)] = ar; + let[.., (_z, _)] = ar; +} + +fn subslice_mixed_min_lengths(a: &Allocator, c: i32) { + let ar = [(a.alloc(), a.alloc()), (a.alloc(), a.alloc())]; + match c { + 0 => { let[_x, ..] = ar; } + 1 => { let[_x, _, ..] = ar; } + 2 => { let[_x, _] = ar; } + 3 => { let[(_x, _), _, ..] = ar; } + 4 => { let[.., (_x, _)] = ar; } + 5 => { let[.., (_x, _), _] = ar; } + 6 => { let [_y @ ..] = ar; } + _ => { let [_y @ .., _] = ar; } + } +} + +fn bindings_after_at_dynamic_init_move(a: &Allocator, c: bool) { + let foo = if c { Some(a.alloc()) } else { None }; + let _x; + + if let bar @ Some(_) = foo { + _x = bar; + } +} + +fn bindings_after_at_dynamic_init_ref(a: &Allocator, c: bool) { + let foo = if c { Some(a.alloc()) } else { None }; + let _x; + + if let bar @ Some(_baz) = &foo { + _x = bar; + } +} + +fn bindings_after_at_dynamic_drop_move(a: &Allocator, c: bool) { + let foo = if c { Some(a.alloc()) } else { None }; + + if let bar @ Some(_) = foo { + bar + } else { + None + }; +} + +fn bindings_after_at_dynamic_drop_ref(a: &Allocator, c: bool) { + let foo = if c { Some(a.alloc()) } else { None }; + + if let bar @ Some(_baz) = &foo { + bar + } else { + &None + }; +} + +fn move_ref_pattern(a: &Allocator) { + let mut tup = (a.alloc(), a.alloc(), a.alloc(), a.alloc()); + let (ref _a, ref mut _b, _c, mut _d) = tup; +} + +fn panic_after_return(a: &Allocator) -> Ptr<'_> { + // Panic in the drop of `p` or `q` can leak + let exceptions = vec![8, 9]; + a.alloc(); + let p = a.alloc(); + { + a.alloc(); + let p = a.alloc(); + // FIXME (#47949) We leak values when we panic in a destructor after + // evaluating an expression with `rustc_mir::build::Builder::into`. + a.alloc_leaked(exceptions) + } +} + +fn panic_after_return_expr(a: &Allocator) -> Ptr<'_> { + // Panic in the drop of `p` or `q` can leak + let exceptions = vec![8, 9]; + a.alloc(); + let p = a.alloc(); + { + a.alloc(); + let q = a.alloc(); + // FIXME (#47949) + return a.alloc_leaked(exceptions); + } +} + +fn panic_after_init(a: &Allocator) { + // Panic in the drop of `r` can leak + let exceptions = vec![8]; + a.alloc(); + let p = a.alloc(); + let q = { + a.alloc(); + let r = a.alloc(); + // FIXME (#47949) + a.alloc_leaked(exceptions) + }; +} + +fn panic_after_init_temp(a: &Allocator) { + // Panic in the drop of `r` can leak + let exceptions = vec![8]; + a.alloc(); + let p = a.alloc(); + { + a.alloc(); + let r = a.alloc(); + // FIXME (#47949) + a.alloc_leaked(exceptions) + }; +} + +fn panic_after_init_by_loop(a: &Allocator) { + // Panic in the drop of `r` can leak + let exceptions = vec![8]; + a.alloc(); + let p = a.alloc(); + let q = loop { + a.alloc(); + let r = a.alloc(); + // FIXME (#47949) + break a.alloc_leaked(exceptions); + }; +} + +fn run_test<F>(mut f: F) + where F: FnMut(&Allocator) +{ + let first_alloc = Allocator::new(usize::MAX); + f(&first_alloc); + + for failing_op in 1..first_alloc.cur_ops.get()+1 { + let alloc = Allocator::new(failing_op); + let alloc = &alloc; + let f = panic::AssertUnwindSafe(&mut f); + let result = panic::catch_unwind(move || { + f.0(alloc); + }); + match result { + Ok(..) => panic!("test executed {} ops but now {}", + first_alloc.cur_ops.get(), alloc.cur_ops.get()), + Err(e) => { + if e.downcast_ref::<InjectedFailure>().is_none() { + panic::resume_unwind(e); + } + } + } + } +} + +fn run_test_nopanic<F>(mut f: F) + where F: FnMut(&Allocator) +{ + let first_alloc = Allocator::new(usize::MAX); + f(&first_alloc); +} + +fn main() { + run_test(|a| dynamic_init(a, false)); + run_test(|a| dynamic_init(a, true)); + run_test(|a| dynamic_drop(a, false)); + run_test(|a| dynamic_drop(a, true)); + + run_test(|a| assignment2(a, false, false)); + run_test(|a| assignment2(a, false, true)); + run_test(|a| assignment2(a, true, false)); + run_test(|a| assignment2(a, true, true)); + + run_test(|a| assignment1(a, false)); + run_test(|a| assignment1(a, true)); + + run_test(|a| array_simple(a)); + run_test(|a| vec_simple(a)); + run_test(|a| vec_unreachable(a)); + + run_test(|a| struct_dynamic_drop(a, false, false, false)); + run_test(|a| struct_dynamic_drop(a, false, false, true)); + run_test(|a| struct_dynamic_drop(a, false, true, false)); + run_test(|a| struct_dynamic_drop(a, false, true, true)); + run_test(|a| struct_dynamic_drop(a, true, false, false)); + run_test(|a| struct_dynamic_drop(a, true, false, true)); + run_test(|a| struct_dynamic_drop(a, true, true, false)); + run_test(|a| struct_dynamic_drop(a, true, true, true)); + + run_test(|a| field_assignment(a, false)); + run_test(|a| field_assignment(a, true)); + + run_test(|a| generator(a, 0)); + run_test(|a| generator(a, 1)); + run_test(|a| generator(a, 2)); + run_test(|a| generator(a, 3)); + + run_test(|a| mixed_drop_and_nondrop(a)); + + run_test(|a| slice_pattern_first(a)); + run_test(|a| slice_pattern_middle(a)); + run_test(|a| slice_pattern_two(a)); + run_test(|a| slice_pattern_last(a)); + run_test(|a| slice_pattern_one_of(a, 0)); + run_test(|a| slice_pattern_one_of(a, 1)); + run_test(|a| slice_pattern_one_of(a, 2)); + run_test(|a| slice_pattern_one_of(a, 3)); + + run_test(|a| subslice_pattern_from_end(a, true)); + run_test(|a| subslice_pattern_from_end(a, false)); + run_test(|a| subslice_pattern_from_end_with_drop(a, true, true)); + run_test(|a| subslice_pattern_from_end_with_drop(a, true, false)); + run_test(|a| subslice_pattern_from_end_with_drop(a, false, true)); + run_test(|a| subslice_pattern_from_end_with_drop(a, false, false)); + run_test(|a| slice_pattern_reassign(a)); + run_test(|a| subslice_pattern_reassign(a)); + + run_test(|a| index_field_mixed_ends(a)); + run_test(|a| subslice_mixed_min_lengths(a, 0)); + run_test(|a| subslice_mixed_min_lengths(a, 1)); + run_test(|a| subslice_mixed_min_lengths(a, 2)); + run_test(|a| subslice_mixed_min_lengths(a, 3)); + run_test(|a| subslice_mixed_min_lengths(a, 4)); + run_test(|a| subslice_mixed_min_lengths(a, 5)); + run_test(|a| subslice_mixed_min_lengths(a, 6)); + run_test(|a| subslice_mixed_min_lengths(a, 7)); + + run_test(|a| move_ref_pattern(a)); + + run_test(|a| { + panic_after_return(a); + }); + run_test(|a| { + panic_after_return_expr(a); + }); + run_test(|a| panic_after_init(a)); + run_test(|a| panic_after_init_temp(a)); + run_test(|a| panic_after_init_by_loop(a)); + + run_test(|a| bindings_after_at_dynamic_init_move(a, true)); + run_test(|a| bindings_after_at_dynamic_init_move(a, false)); + run_test(|a| bindings_after_at_dynamic_init_ref(a, true)); + run_test(|a| bindings_after_at_dynamic_init_ref(a, false)); + run_test(|a| bindings_after_at_dynamic_drop_move(a, true)); + run_test(|a| bindings_after_at_dynamic_drop_move(a, false)); + run_test(|a| bindings_after_at_dynamic_drop_ref(a, true)); + run_test(|a| bindings_after_at_dynamic_drop_ref(a, false)); + + run_test_nopanic(|a| union1(a)); +} |