1 pub use self::AssocItemContainer::*;
4 use rustc_data_structures::sorted_map::SortedIndexMultiMap;
6 use rustc_hir::def::{DefKind, Namespace};
7 use rustc_hir::def_id::DefId;
8 use rustc_span::symbol::{Ident, Symbol};
10 use super::{TyCtxt, Visibility};
12 #[derive(Clone, Copy, PartialEq, Eq, Debug, HashStable, Hash)]
13 pub enum AssocItemContainer {
14 TraitContainer(DefId),
18 impl AssocItemContainer {
19 pub fn impl_def_id(&self) -> Option<DefId> {
21 ImplContainer(id) => Some(id),
26 /// Asserts that this is the `DefId` of an associated item declared
27 /// in a trait, and returns the trait `DefId`.
28 pub fn assert_trait(&self) -> DefId {
30 TraitContainer(id) => id,
31 _ => bug!("associated item has wrong container type: {:?}", self),
35 pub fn id(&self) -> DefId {
37 TraitContainer(id) => id,
38 ImplContainer(id) => id,
43 /// Information about an associated item
44 #[derive(Copy, Clone, Debug, PartialEq, HashStable, Eq, Hash)]
45 pub struct AssocItem {
47 #[stable_hasher(project(name))]
51 pub defaultness: hir::Defaultness,
52 pub container: AssocItemContainer,
54 /// If this is an item in an impl of a trait then this is the `DefId` of
55 /// the associated item on the trait that this implements.
56 pub trait_item_def_id: Option<DefId>,
58 /// Whether this is a method with an explicit self
59 /// as its first parameter, allowing method calls.
60 pub fn_has_self_parameter: bool,
64 pub fn signature(&self, tcx: TyCtxt<'_>) -> String {
66 ty::AssocKind::Fn => {
67 // We skip the binder here because the binder would deanonymize all
68 // late-bound regions, and we don't want method signatures to show up
69 // `as for<'r> fn(&'r MyType)`. Pretty-printing handles late-bound
70 // regions just fine, showing `fn(&MyType)`.
71 tcx.fn_sig(self.def_id).skip_binder().to_string()
73 ty::AssocKind::Type => format!("type {};", self.ident),
74 ty::AssocKind::Const => {
75 format!("const {}: {:?};", self.ident, tcx.type_of(self.def_id))
81 #[derive(Copy, Clone, PartialEq, Debug, HashStable, Eq, Hash)]
89 pub fn namespace(&self) -> Namespace {
91 ty::AssocKind::Type => Namespace::TypeNS,
92 ty::AssocKind::Const | ty::AssocKind::Fn => Namespace::ValueNS,
96 pub fn as_def_kind(&self) -> DefKind {
98 AssocKind::Const => DefKind::AssocConst,
99 AssocKind::Fn => DefKind::AssocFn,
100 AssocKind::Type => DefKind::AssocTy,
105 /// A list of `ty::AssocItem`s in definition order that allows for efficient lookup by name.
107 /// When doing lookup by name, we try to postpone hygienic comparison for as long as possible since
108 /// it is relatively expensive. Instead, items are indexed by `Symbol` and hygienic comparison is
109 /// done only on items with the same name.
110 #[derive(Debug, Clone, PartialEq, HashStable)]
111 pub struct AssocItems<'tcx> {
112 pub(super) items: SortedIndexMultiMap<u32, Symbol, &'tcx ty::AssocItem>,
115 impl<'tcx> AssocItems<'tcx> {
116 /// Constructs an `AssociatedItems` map from a series of `ty::AssocItem`s in definition order.
117 pub fn new(items_in_def_order: impl IntoIterator<Item = &'tcx ty::AssocItem>) -> Self {
118 let items = items_in_def_order.into_iter().map(|item| (item.ident.name, item)).collect();
122 /// Returns a slice of associated items in the order they were defined.
124 /// New code should avoid relying on definition order. If you need a particular associated item
125 /// for a known trait, make that trait a lang item instead of indexing this array.
126 pub fn in_definition_order(&self) -> impl '_ + Iterator<Item = &ty::AssocItem> {
127 self.items.iter().map(|(_, v)| *v)
130 pub fn len(&self) -> usize {
134 /// Returns an iterator over all associated items with the given name, ignoring hygiene.
135 pub fn filter_by_name_unhygienic(
138 ) -> impl '_ + Iterator<Item = &ty::AssocItem> {
139 self.items.get_by_key(name).copied()
142 /// Returns the associated item with the given name and `AssocKind`, if one exists.
143 pub fn find_by_name_and_kind(
148 parent_def_id: DefId,
149 ) -> Option<&ty::AssocItem> {
150 self.filter_by_name_unhygienic(ident.name)
151 .filter(|item| item.kind == kind)
152 .find(|item| tcx.hygienic_eq(ident, item.ident, parent_def_id))
155 /// Returns the associated item with the given name and any of `AssocKind`, if one exists.
156 pub fn find_by_name_and_kinds(
161 parent_def_id: DefId,
162 ) -> Option<&ty::AssocItem> {
163 self.filter_by_name_unhygienic(ident.name)
164 .filter(|item| kinds.contains(&item.kind))
165 .find(|item| tcx.hygienic_eq(ident, item.ident, parent_def_id))
168 /// Returns the associated item with the given name in the given `Namespace`, if one exists.
169 pub fn find_by_name_and_namespace(
174 parent_def_id: DefId,
175 ) -> Option<&ty::AssocItem> {
176 self.filter_by_name_unhygienic(ident.name)
177 .filter(|item| item.kind.namespace() == ns)
178 .find(|item| tcx.hygienic_eq(ident, item.ident, parent_def_id))