1 use rustc_data_structures::fx::FxHashMap;
2 use rustc_hir::def_id::DefId;
3 use rustc_middle::ty::{self, OutlivesPredicate, TyCtxt};
8 pub struct ExplicitPredicatesMap<'tcx> {
9 map: FxHashMap<DefId, RequiredPredicates<'tcx>>,
12 impl<'tcx> ExplicitPredicatesMap<'tcx> {
13 pub fn new() -> ExplicitPredicatesMap<'tcx> {
14 ExplicitPredicatesMap { map: FxHashMap::default() }
17 pub fn explicit_predicates_of(
21 ) -> &RequiredPredicates<'tcx> {
22 self.map.entry(def_id).or_insert_with(|| {
23 let predicates = if def_id.is_local() {
24 tcx.explicit_predicates_of(def_id)
26 tcx.predicates_of(def_id)
28 let mut required_predicates = RequiredPredicates::default();
30 // process predicates and convert to `RequiredPredicates` entry, see below
31 for &(predicate, span) in predicates.predicates {
32 match predicate.skip_binders() {
33 ty::PredicateAtom::TypeOutlives(OutlivesPredicate(ref ty, ref reg)) => {
34 insert_outlives_predicate(
39 &mut required_predicates,
43 ty::PredicateAtom::RegionOutlives(OutlivesPredicate(ref reg1, ref reg2)) => {
44 insert_outlives_predicate(
49 &mut required_predicates,
53 ty::PredicateAtom::Trait(..)
54 | ty::PredicateAtom::Projection(..)
55 | ty::PredicateAtom::WellFormed(..)
56 | ty::PredicateAtom::ObjectSafe(..)
57 | ty::PredicateAtom::ClosureKind(..)
58 | ty::PredicateAtom::Subtype(..)
59 | ty::PredicateAtom::ConstEvaluatable(..)
60 | ty::PredicateAtom::ConstEquate(..)
61 | ty::PredicateAtom::TypeWellFormedFromEnv(..) => (),