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1 | // Copyright 2017 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 | use rustc::hir::def_id::{CrateNum, DefId, LOCAL_CRATE}; | |
12 | use rustc::hir; | |
13 | use rustc::hir::itemlikevisit::ItemLikeVisitor; | |
14 | use rustc::traits::{self, Reveal}; | |
15 | use rustc::ty::{self, TyCtxt}; | |
16 | ||
17 | use syntax_pos::DUMMY_SP; | |
18 | ||
19 | pub fn crate_inherent_impls_overlap_check<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, | |
20 | crate_num: CrateNum) { | |
21 | assert_eq!(crate_num, LOCAL_CRATE); | |
22 | let krate = tcx.hir.krate(); | |
23 | krate.visit_all_item_likes(&mut InherentOverlapChecker { tcx }); | |
24 | } | |
25 | ||
26 | struct InherentOverlapChecker<'a, 'tcx: 'a> { | |
27 | tcx: TyCtxt<'a, 'tcx, 'tcx> | |
28 | } | |
29 | ||
30 | impl<'a, 'tcx> InherentOverlapChecker<'a, 'tcx> { | |
31 | fn check_for_common_items_in_impls(&self, impl1: DefId, impl2: DefId) { | |
32 | #[derive(Copy, Clone, PartialEq)] | |
33 | enum Namespace { | |
34 | Type, | |
35 | Value, | |
36 | } | |
37 | ||
38 | let name_and_namespace = |def_id| { | |
39 | let item = self.tcx.associated_item(def_id); | |
40 | (item.name, match item.kind { | |
41 | ty::AssociatedKind::Type => Namespace::Type, | |
42 | ty::AssociatedKind::Const | | |
43 | ty::AssociatedKind::Method => Namespace::Value, | |
44 | }) | |
45 | }; | |
46 | ||
47 | let impl_items1 = self.tcx.associated_item_def_ids(impl1); | |
48 | let impl_items2 = self.tcx.associated_item_def_ids(impl2); | |
49 | ||
50 | for &item1 in &impl_items1[..] { | |
51 | let (name, namespace) = name_and_namespace(item1); | |
52 | ||
53 | for &item2 in &impl_items2[..] { | |
54 | if (name, namespace) == name_and_namespace(item2) { | |
55 | struct_span_err!(self.tcx.sess, | |
56 | self.tcx.span_of_impl(item1).unwrap(), | |
57 | E0592, | |
58 | "duplicate definitions with name `{}`", | |
59 | name) | |
60 | .span_label(self.tcx.span_of_impl(item1).unwrap(), | |
61 | &format!("duplicate definitions for `{}`", name)) | |
62 | .span_label(self.tcx.span_of_impl(item2).unwrap(), | |
63 | &format!("other definition for `{}`", name)) | |
64 | .emit(); | |
65 | } | |
66 | } | |
67 | } | |
68 | } | |
69 | ||
70 | fn check_for_overlapping_inherent_impls(&self, ty_def_id: DefId) { | |
71 | let impls = ty::queries::inherent_impls::get(self.tcx, DUMMY_SP, ty_def_id); | |
72 | ||
73 | for (i, &impl1_def_id) in impls.iter().enumerate() { | |
74 | for &impl2_def_id in &impls[(i + 1)..] { | |
75 | self.tcx.infer_ctxt((), Reveal::UserFacing).enter(|infcx| { | |
76 | if traits::overlapping_impls(&infcx, impl1_def_id, impl2_def_id).is_some() { | |
77 | self.check_for_common_items_in_impls(impl1_def_id, impl2_def_id) | |
78 | } | |
79 | }); | |
80 | } | |
81 | } | |
82 | } | |
83 | } | |
84 | ||
85 | impl<'a, 'tcx, 'v> ItemLikeVisitor<'v> for InherentOverlapChecker<'a, 'tcx> { | |
86 | fn visit_item(&mut self, item: &'v hir::Item) { | |
87 | match item.node { | |
88 | hir::ItemEnum(..) | | |
89 | hir::ItemStruct(..) | | |
90 | hir::ItemTrait(..) | | |
91 | hir::ItemUnion(..) => { | |
92 | let type_def_id = self.tcx.hir.local_def_id(item.id); | |
93 | self.check_for_overlapping_inherent_impls(type_def_id); | |
94 | } | |
95 | _ => {} | |
96 | } | |
97 | } | |
98 | ||
99 | fn visit_trait_item(&mut self, _trait_item: &hir::TraitItem) { | |
100 | } | |
101 | ||
102 | fn visit_impl_item(&mut self, _impl_item: &hir::ImplItem) { | |
103 | } | |
104 | } | |
105 |