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Unconditionally encode hidden types in typeck results

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This commit is contained in:
Oli Scherer 2022-09-20 08:56:04 +00:00
parent 43c22af267
commit 5d15beb591
4 changed files with 43 additions and 47 deletions
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44
compiler/rustc_hir_analysis/src/check/writeback.rs
View file

@ -536,33 +536,29 @@ impl<'cx, 'tcx> WritebackCx<'cx, 'tcx> {
let opaque_types =
self.fcx.infcx.inner.borrow_mut().opaque_type_storage.take_opaque_types();
for (opaque_type_key, decl) in opaque_types {
let hidden_type = match decl.origin {
hir::OpaqueTyOrigin::FnReturn(_) | hir::OpaqueTyOrigin::AsyncFn(_) => {
let ty = self.resolve(decl.hidden_type.ty, &decl.hidden_type.span);
struct RecursionChecker {
def_id: LocalDefId,
}
impl<'tcx> ty::TypeVisitor<'tcx> for RecursionChecker {
type BreakTy = ();
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::Opaque(def_id, _) = *t.kind() {
if def_id == self.def_id.to_def_id() {
return ControlFlow::Break(());
}
}
t.super_visit_with(self)
let hidden_type = self.resolve(decl.hidden_type.ty, &decl.hidden_type.span);
struct RecursionChecker {
def_id: LocalDefId,
}
impl<'tcx> ty::TypeVisitor<'tcx> for RecursionChecker {
type BreakTy = ();
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::Opaque(def_id, _) = *t.kind() {
if def_id == self.def_id.to_def_id() {
return ControlFlow::Break(());
}
}
if ty
.visit_with(&mut RecursionChecker { def_id: opaque_type_key.def_id })
.is_break()
{
return;
}
Some(ty)
t.super_visit_with(self)
}
hir::OpaqueTyOrigin::TyAlias => None,
};
}
if hidden_type
.visit_with(&mut RecursionChecker { def_id: opaque_type_key.def_id })
.is_break()
{
continue;
}
self.typeck_results.concrete_opaque_types.insert(opaque_type_key.def_id, hidden_type);
}
}

23
compiler/rustc_hir_analysis/src/collect/type_of.rs
View file

@ -788,20 +788,15 @@ fn find_opaque_ty_constraints_for_rpit(
// the `concrete_opaque_types` table.
tcx.ty_error()
} else {
table
.concrete_opaque_types
.get(&def_id)
.copied()
.unwrap_or_else(|| {
// We failed to resolve the opaque type or it
// resolves to itself. We interpret this as the
// no values of the hidden type ever being constructed,
// so we can just make the hidden type be `!`.
// For backwards compatibility reasons, we fall back to
// `()` until we the diverging default is changed.
Some(tcx.mk_diverging_default())
})
.expect("RPIT always have a hidden type from typeck")
table.concrete_opaque_types.get(&def_id).copied().unwrap_or_else(|| {
// We failed to resolve the opaque type or it
// resolves to itself. We interpret this as the
// no values of the hidden type ever being constructed,
// so we can just make the hidden type be `!`.
// For backwards compatibility reasons, we fall back to
// `()` until we the diverging default is changed.
tcx.mk_diverging_default()
})
}
})
}