118 lines
2.5 KiB
Rust
118 lines
2.5 KiB
Rust
// Reject mixing cyclic structure and Drop when using TypedArena.
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//
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// (Compare against dropck-vec-cycle-checked.rs)
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//
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// (Also compare against ui-fulldeps/dropck-tarena-unsound-drop.rs,
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// which is a reduction of this code to more directly show the reason
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// for the error message we see here.)
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#![feature(rustc_private)]
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extern crate rustc_arena;
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use rustc_arena::TypedArena;
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use std::cell::Cell;
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use id::Id;
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mod s {
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use std::sync::atomic::{AtomicUsize, Ordering};
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static S_COUNT: AtomicUsize = AtomicUsize::new(0);
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pub fn next_count() -> usize {
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S_COUNT.fetch_add(1, Ordering::SeqCst) + 1
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}
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}
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mod id {
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use s;
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#[derive(Debug)]
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pub struct Id {
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orig_count: usize,
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count: usize,
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}
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impl Id {
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pub fn new() -> Id {
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let c = s::next_count();
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println!("building Id {}", c);
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Id { orig_count: c, count: c }
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}
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pub fn count(&self) -> usize {
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println!("Id::count on {} returns {}", self.orig_count, self.count);
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self.count
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}
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}
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impl Drop for Id {
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fn drop(&mut self) {
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println!("dropping Id {}", self.count);
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self.count = 0;
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}
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}
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}
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trait HasId {
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fn count(&self) -> usize;
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}
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#[derive(Debug)]
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struct CheckId<T:HasId> {
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v: T
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}
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#[allow(non_snake_case)]
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fn CheckId<T:HasId>(t: T) -> CheckId<T> { CheckId{ v: t } }
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impl<T:HasId> Drop for CheckId<T> {
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fn drop(&mut self) {
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assert!(self.v.count() > 0);
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}
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}
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#[derive(Debug)]
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struct C<'a> {
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id: Id,
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v: Vec<CheckId<Cell<Option<&'a C<'a>>>>>,
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}
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impl<'a> HasId for Cell<Option<&'a C<'a>>> {
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fn count(&self) -> usize {
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match self.get() {
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None => 1,
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Some(c) => c.id.count(),
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}
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}
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}
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impl<'a> C<'a> {
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fn new() -> C<'a> {
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C { id: Id::new(), v: Vec::new() }
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}
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}
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fn f<'a>(arena: &'a TypedArena<C<'a>>) {
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let c1 = arena.alloc(C::new());
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let c2 = arena.alloc(C::new());
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let c3 = arena.alloc(C::new());
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c1.v.push(CheckId(Cell::new(None)));
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c1.v.push(CheckId(Cell::new(None)));
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c2.v.push(CheckId(Cell::new(None)));
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c2.v.push(CheckId(Cell::new(None)));
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c3.v.push(CheckId(Cell::new(None)));
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c3.v.push(CheckId(Cell::new(None)));
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c1.v[0].v.set(Some(c2));
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c1.v[1].v.set(Some(c3));
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c2.v[0].v.set(Some(c2));
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c2.v[1].v.set(Some(c3));
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c3.v[0].v.set(Some(c1));
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c3.v[1].v.set(Some(c2));
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}
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fn main() {
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let arena = TypedArena::default();
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f(&arena);
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} //~^ ERROR `arena` does not live long enough
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