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[rustc.git] / src / test / compile-fail / dropck_tarena_cycle_checked.rs
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1// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2// file at the top-level directory of this distribution and at
3// http://rust-lang.org/COPYRIGHT.
4//
5// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8// option. This file may not be copied, modified, or distributed
9// except according to those terms.
10
11// Reject mixing cyclic structure and Drop when using TypedArena.
12//
13// (Compare against compile-fail/dropck_vec_cycle_checked.rs)
14//
15// (Also compare against compile-fail/dropck_tarena_unsound_drop.rs,
16// which is a reduction of this code to more directly show the reason
17// for the error message we see here.)
18
62682a34 19#![feature(const_fn)]
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20
21extern crate arena;
22
23use arena::TypedArena;
24use std::cell::Cell;
25use id::Id;
26
27mod s {
62682a34 28 use std::sync::atomic::{AtomicUsize, Ordering};
85aaf69f 29
62682a34 30 static S_COUNT: AtomicUsize = AtomicUsize::new(0);
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31
32 pub fn next_count() -> usize {
33 S_COUNT.fetch_add(1, Ordering::SeqCst) + 1
34 }
35}
36
37mod id {
38 use s;
39 #[derive(Debug)]
40 pub struct Id {
41 orig_count: usize,
42 count: usize,
43 }
44
45 impl Id {
46 pub fn new() -> Id {
47 let c = s::next_count();
48 println!("building Id {}", c);
49 Id { orig_count: c, count: c }
50 }
51 pub fn count(&self) -> usize {
52 println!("Id::count on {} returns {}", self.orig_count, self.count);
53 self.count
54 }
55 }
56
57 impl Drop for Id {
58 fn drop(&mut self) {
59 println!("dropping Id {}", self.count);
60 self.count = 0;
61 }
62 }
63}
64
65trait HasId {
66 fn count(&self) -> usize;
67}
68
69#[derive(Debug)]
70struct CheckId<T:HasId> {
71 v: T
72}
73
74#[allow(non_snake_case)]
75fn CheckId<T:HasId>(t: T) -> CheckId<T> { CheckId{ v: t } }
76
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77impl<T:HasId> Drop for CheckId<T> {
78 fn drop(&mut self) {
79 assert!(self.v.count() > 0);
80 }
81}
82
83#[derive(Debug)]
84struct C<'a> {
85 id: Id,
86 v: Vec<CheckId<Cell<Option<&'a C<'a>>>>>,
87}
88
89impl<'a> HasId for Cell<Option<&'a C<'a>>> {
90 fn count(&self) -> usize {
91 match self.get() {
92 None => 1,
93 Some(c) => c.id.count(),
94 }
95 }
96}
97
98impl<'a> C<'a> {
99 fn new() -> C<'a> {
100 C { id: Id::new(), v: Vec::new() }
101 }
102}
103
104fn f<'a>(arena: &'a TypedArena<C<'a>>) {
105 let c1 = arena.alloc(C::new());
106 let c2 = arena.alloc(C::new());
107 let c3 = arena.alloc(C::new());
108
109 c1.v.push(CheckId(Cell::new(None)));
110 c1.v.push(CheckId(Cell::new(None)));
111 c2.v.push(CheckId(Cell::new(None)));
112 c2.v.push(CheckId(Cell::new(None)));
113 c3.v.push(CheckId(Cell::new(None)));
114 c3.v.push(CheckId(Cell::new(None)));
115
116 c1.v[0].v.set(Some(c2));
117 c1.v[1].v.set(Some(c3));
118 c2.v[0].v.set(Some(c2));
119 c2.v[1].v.set(Some(c3));
120 c3.v[0].v.set(Some(c1));
121 c3.v[1].v.set(Some(c2));
122}
123
124fn main() {
125 let arena = TypedArena::new();
126 f(&arena); //~ ERROR `arena` does not live long enough
127}