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use rustc::hir;
use rustc::hir::def_id::{CrateNum, DefId};
use rustc::hir::itemlikevisit::ItemLikeVisitor;
use rustc::ty::{self, TyCtxt};
use util::nodemap::FxHashMap;
use super::utils::*;
pub fn explicit_predicates<'tcx>(
tcx: TyCtxt<'_, 'tcx, 'tcx>,
crate_num: CrateNum,
) -> FxHashMap<DefId, RequiredPredicates<'tcx>> {
let mut predicates = FxHashMap::default();
tcx.hir.krate().visit_all_item_likes(&mut ExplicitVisitor {
tcx: tcx,
explicit_predicates: &mut predicates,
crate_num: crate_num,
});
predicates
}
pub struct ExplicitVisitor<'cx, 'tcx: 'cx> {
tcx: TyCtxt<'cx, 'tcx, 'tcx>,
explicit_predicates: &'cx mut FxHashMap<DefId, RequiredPredicates<'tcx>>,
crate_num: CrateNum,
}
impl<'cx, 'tcx> ItemLikeVisitor<'tcx> for ExplicitVisitor<'cx, 'tcx> {
fn visit_item(&mut self, item: &'tcx hir::Item) {
let def_id = DefId {
krate: self.crate_num,
index: item.hir_id.owner,
};
let mut required_predicates = RequiredPredicates::default();
let local_explicit_predicate = self.tcx.explicit_predicates_of(def_id).predicates;
for pred in local_explicit_predicate.into_iter() {
match pred {
ty::Predicate::TypeOutlives(predicate) => {
let ty::OutlivesPredicate(ref ty, ref reg) = predicate.skip_binder();
insert_outlives_predicate(self.tcx, (*ty).into(), reg, &mut required_predicates)
}
ty::Predicate::RegionOutlives(predicate) => {
let ty::OutlivesPredicate(ref reg1, ref reg2) = predicate.skip_binder();
insert_outlives_predicate(
self.tcx,
(*reg1).into(),
reg2,
&mut required_predicates,
)
}
ty::Predicate::Trait(..)
| ty::Predicate::Projection(..)
| ty::Predicate::WellFormed(..)
| ty::Predicate::ObjectSafe(..)
| ty::Predicate::ClosureKind(..)
| ty::Predicate::Subtype(..)
| ty::Predicate::ConstEvaluatable(..) => (),
}
}
self.explicit_predicates.insert(def_id, required_predicates);
}
fn visit_trait_item(&mut self, _trait_item: &'tcx hir::TraitItem) {}
fn visit_impl_item(&mut self, _impl_item: &'tcx hir::ImplItem) {}
}