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Add expanded type cache to OpaqueTypeExpander

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This commit is contained in:
Tyler Mandry 2019-10-10 16:38:05 -07:00
parent 58b54911fa
commit fe09bb518d
1 changed files with 14 additions and 3 deletions
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17
src/librustc/ty/util.rs
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@ -697,6 +697,9 @@ impl<'tcx> TyCtxt<'tcx> {
// that type, and when we finish expanding that type we remove the
// its DefId.
seen_opaque_tys: FxHashSet<DefId>,
// Cache of all expansions we've seen so far. This is a critical
// optimization for some large types produced by async fn trees.
expanded_cache: FxHashMap<(DefId, SubstsRef<'tcx>), Ty<'tcx>>,
primary_def_id: DefId,
found_recursion: bool,
tcx: TyCtxt<'tcx>,
@ -713,9 +716,16 @@ impl<'tcx> TyCtxt<'tcx> {
}
let substs = substs.fold_with(self);
if self.seen_opaque_tys.insert(def_id) {
let generic_ty = self.tcx.type_of(def_id);
let concrete_ty = generic_ty.subst(self.tcx, substs);
let expanded_ty = self.fold_ty(concrete_ty);
let expanded_ty = match self.expanded_cache.get(&(def_id, substs)) {
Some(expanded_ty) => expanded_ty,
None => {
let generic_ty = self.tcx.type_of(def_id);
let concrete_ty = generic_ty.subst(self.tcx, substs);
let expanded_ty = self.fold_ty(concrete_ty);
self.expanded_cache.insert((def_id, substs), expanded_ty);
expanded_ty
}
};
self.seen_opaque_tys.remove(&def_id);
Some(expanded_ty)
} else {
@ -743,6 +753,7 @@ impl<'tcx> TyCtxt<'tcx> {
let mut visitor = OpaqueTypeExpander {
seen_opaque_tys: FxHashSet::default(),
expanded_cache: FxHashMap::default(),
primary_def_id: def_id,
found_recursion: false,
tcx: self,