diff options
Diffstat (limited to 'compiler/rustc_typeck/src/outlives/explicit.rs')
-rw-r--r-- | compiler/rustc_typeck/src/outlives/explicit.rs | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/compiler/rustc_typeck/src/outlives/explicit.rs b/compiler/rustc_typeck/src/outlives/explicit.rs new file mode 100644 index 000000000..7534482cc --- /dev/null +++ b/compiler/rustc_typeck/src/outlives/explicit.rs @@ -0,0 +1,69 @@ +use rustc_data_structures::fx::FxHashMap; +use rustc_hir::def_id::DefId; +use rustc_middle::ty::{self, OutlivesPredicate, TyCtxt}; + +use super::utils::*; + +#[derive(Debug)] +pub struct ExplicitPredicatesMap<'tcx> { + map: FxHashMap<DefId, ty::EarlyBinder<RequiredPredicates<'tcx>>>, +} + +impl<'tcx> ExplicitPredicatesMap<'tcx> { + pub fn new() -> ExplicitPredicatesMap<'tcx> { + ExplicitPredicatesMap { map: FxHashMap::default() } + } + + pub(crate) fn explicit_predicates_of( + &mut self, + tcx: TyCtxt<'tcx>, + def_id: DefId, + ) -> &ty::EarlyBinder<RequiredPredicates<'tcx>> { + self.map.entry(def_id).or_insert_with(|| { + let predicates = if def_id.is_local() { + tcx.explicit_predicates_of(def_id) + } else { + tcx.predicates_of(def_id) + }; + let mut required_predicates = RequiredPredicates::default(); + + // process predicates and convert to `RequiredPredicates` entry, see below + for &(predicate, span) in predicates.predicates { + match predicate.kind().skip_binder() { + ty::PredicateKind::TypeOutlives(OutlivesPredicate(ty, reg)) => { + insert_outlives_predicate( + tcx, + ty.into(), + reg, + span, + &mut required_predicates, + ) + } + + ty::PredicateKind::RegionOutlives(OutlivesPredicate(reg1, reg2)) => { + insert_outlives_predicate( + tcx, + reg1.into(), + reg2, + span, + &mut required_predicates, + ) + } + + ty::PredicateKind::Trait(..) + | ty::PredicateKind::Projection(..) + | ty::PredicateKind::WellFormed(..) + | ty::PredicateKind::ObjectSafe(..) + | ty::PredicateKind::ClosureKind(..) + | ty::PredicateKind::Subtype(..) + | ty::PredicateKind::Coerce(..) + | ty::PredicateKind::ConstEvaluatable(..) + | ty::PredicateKind::ConstEquate(..) + | ty::PredicateKind::TypeWellFormedFromEnv(..) => (), + } + } + + ty::EarlyBinder(required_predicates) + }) + } +} |