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use hir::map as hir_map;
use rustc::hir;
use rustc::hir::def_id::{CrateNum, DefId, LocalDefId, LOCAL_CRATE};
use rustc::hir::itemlikevisit::ItemLikeVisitor;
use rustc::ty::maps::Providers;
use rustc::ty::{self, CratePredicatesMap, TyCtxt};
use rustc_data_structures::sync::Lrc;
use util::nodemap::FxHashMap;
pub fn explicit_predicates<'tcx>(
tcx: TyCtxt<'_, 'tcx, 'tcx>,
crate_num: CrateNum,
) -> FxHashMap<DefId, Lrc<Vec<ty::Predicate<'tcx>>>> {
assert_eq!(crate_num, LOCAL_CRATE);
let mut predicates: FxHashMap<DefId, Lrc<Vec<ty::Predicate<'tcx>>>> = FxHashMap();
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, Lrc<Vec<ty::Predicate<'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 local_explicit_predicate = self.tcx.explicit_predicates_of(def_id);
let filtered_predicates = local_explicit_predicate
.predicates
.into_iter()
.filter(|pred| match pred {
ty::Predicate::TypeOutlives(..) | ty::Predicate::RegionOutlives(..) => true,
ty::Predicate::Trait(..)
| ty::Predicate::Projection(..)
| ty::Predicate::WellFormed(..)
| ty::Predicate::ObjectSafe(..)
| ty::Predicate::ClosureKind(..)
| ty::Predicate::Subtype(..)
| ty::Predicate::ConstEvaluatable(..) => false,
})
.collect();
match item.node {
hir::ItemStruct(..) | hir::ItemEnum(..) => {
self.tcx.adt_def(def_id);
}
_ => {}
}
self.explicit_predicates
.insert(def_id, Lrc::new(filtered_predicates));
}
fn visit_trait_item(&mut self, trait_item: &'tcx hir::TraitItem) {}
fn visit_impl_item(&mut self, impl_item: &'tcx hir::ImplItem) {}
}