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1 | // Copyright 2014 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 | //! Unsafety checker: every impl either implements a trait defined in this | |
12 | //! crate or pertains to a type defined in this crate. | |
13 | ||
54a0048b SL |
14 | use rustc::ty::TyCtxt; |
15 | use rustc::hir::intravisit; | |
16 | use rustc::hir; | |
1a4d82fc | 17 | |
54a0048b | 18 | pub fn check(tcx: &TyCtxt) { |
1a4d82fc | 19 | let mut orphan = UnsafetyChecker { tcx: tcx }; |
92a42be0 | 20 | tcx.map.krate().visit_all_items(&mut orphan); |
1a4d82fc JJ |
21 | } |
22 | ||
23 | struct UnsafetyChecker<'cx, 'tcx:'cx> { | |
54a0048b | 24 | tcx: &'cx TyCtxt<'tcx> |
1a4d82fc JJ |
25 | } |
26 | ||
c34b1796 | 27 | impl<'cx, 'tcx, 'v> UnsafetyChecker<'cx, 'tcx> { |
e9174d1e SL |
28 | fn check_unsafety_coherence(&mut self, item: &'v hir::Item, |
29 | unsafety: hir::Unsafety, | |
30 | polarity: hir::ImplPolarity) { | |
b039eaaf | 31 | match self.tcx.impl_trait_ref(self.tcx.map.local_def_id(item.id)) { |
c34b1796 AL |
32 | None => { |
33 | // Inherent impl. | |
34 | match unsafety { | |
e9174d1e SL |
35 | hir::Unsafety::Normal => { /* OK */ } |
36 | hir::Unsafety::Unsafe => { | |
c34b1796 AL |
37 | span_err!(self.tcx.sess, item.span, E0197, |
38 | "inherent impls cannot be declared as unsafe"); | |
1a4d82fc | 39 | } |
c34b1796 AL |
40 | } |
41 | } | |
1a4d82fc | 42 | |
c34b1796 | 43 | Some(trait_ref) => { |
c1a9b12d | 44 | let trait_def = self.tcx.lookup_trait_def(trait_ref.def_id); |
c34b1796 | 45 | match (trait_def.unsafety, unsafety, polarity) { |
e9174d1e SL |
46 | (hir::Unsafety::Unsafe, |
47 | hir::Unsafety::Unsafe, hir::ImplPolarity::Negative) => { | |
c34b1796 AL |
48 | span_err!(self.tcx.sess, item.span, E0198, |
49 | "negative implementations are not unsafe"); | |
50 | } | |
1a4d82fc | 51 | |
e9174d1e | 52 | (hir::Unsafety::Normal, hir::Unsafety::Unsafe, _) => { |
c34b1796 AL |
53 | span_err!(self.tcx.sess, item.span, E0199, |
54 | "implementing the trait `{}` is not unsafe", | |
62682a34 | 55 | trait_ref); |
c34b1796 | 56 | } |
1a4d82fc | 57 | |
e9174d1e SL |
58 | (hir::Unsafety::Unsafe, |
59 | hir::Unsafety::Normal, hir::ImplPolarity::Positive) => { | |
c34b1796 AL |
60 | span_err!(self.tcx.sess, item.span, E0200, |
61 | "the trait `{}` requires an `unsafe impl` declaration", | |
62682a34 | 62 | trait_ref); |
c34b1796 | 63 | } |
85aaf69f | 64 | |
e9174d1e SL |
65 | (hir::Unsafety::Unsafe, |
66 | hir::Unsafety::Normal, hir::ImplPolarity::Negative) | | |
67 | (hir::Unsafety::Unsafe, | |
68 | hir::Unsafety::Unsafe, hir::ImplPolarity::Positive) | | |
69 | (hir::Unsafety::Normal, hir::Unsafety::Normal, _) => { | |
c34b1796 | 70 | /* OK */ |
1a4d82fc JJ |
71 | } |
72 | } | |
73 | } | |
c34b1796 AL |
74 | } |
75 | } | |
76 | } | |
77 | ||
92a42be0 | 78 | impl<'cx, 'tcx,'v> intravisit::Visitor<'v> for UnsafetyChecker<'cx, 'tcx> { |
e9174d1e | 79 | fn visit_item(&mut self, item: &'v hir::Item) { |
c34b1796 | 80 | match item.node { |
e9174d1e SL |
81 | hir::ItemDefaultImpl(unsafety, _) => { |
82 | self.check_unsafety_coherence(item, unsafety, hir::ImplPolarity::Positive); | |
c34b1796 | 83 | } |
e9174d1e | 84 | hir::ItemImpl(unsafety, polarity, _, _, _, _) => { |
c34b1796 AL |
85 | self.check_unsafety_coherence(item, unsafety, polarity); |
86 | } | |
1a4d82fc JJ |
87 | _ => { } |
88 | } | |
1a4d82fc JJ |
89 | } |
90 | } |