bjoernager/rust
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Don't derive TyEncodable/TyDecodable for Binder

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This commit is contained in:
Jack Huey 2021-01-17 04:13:51 -05:00
parent 674735b109
commit c76f47832a
3 changed files with 35 additions and 10 deletions
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41
compiler/rustc_middle/src/ty/codec.rs
View file

@ -120,9 +120,9 @@ impl<'tcx, E: TyEncoder<'tcx>> Encodable<E> for Ty<'tcx> {
}
}
impl<'tcx, E: TyEncoder<'tcx>> Encodable<E> for ty::PredicateKind<'tcx> {
impl<'tcx, E: TyEncoder<'tcx>> Encodable<E> for ty::Binder<ty::PredicateKind<'tcx>> {
fn encode(&self, e: &mut E) -> Result<(), E::Error> {
encode_with_shorthand(e, self, TyEncoder::predicate_shorthands)
encode_with_shorthand(e, &self.skip_binder(), TyEncoder::predicate_shorthands)
}
}
@ -226,18 +226,18 @@ impl<'tcx, D: TyDecoder<'tcx>> Decodable<D> for Ty<'tcx> {
}
}
impl<'tcx, D: TyDecoder<'tcx>> Decodable<D> for ty::PredicateKind<'tcx> {
fn decode(decoder: &mut D) -> Result<ty::PredicateKind<'tcx>, D::Error> {
impl<'tcx, D: TyDecoder<'tcx>> Decodable<D> for ty::Binder<ty::PredicateKind<'tcx>> {
fn decode(decoder: &mut D) -> Result<ty::Binder<ty::PredicateKind<'tcx>>, D::Error> {
// Handle shorthands first, if we have an usize > 0x80.
if decoder.positioned_at_shorthand() {
Ok(ty::Binder::bind(if decoder.positioned_at_shorthand() {
let pos = decoder.read_usize()?;
assert!(pos >= SHORTHAND_OFFSET);
let shorthand = pos - SHORTHAND_OFFSET;
decoder.with_position(shorthand, ty::PredicateKind::decode)
decoder.with_position(shorthand, ty::PredicateKind::decode)?
} else {
Ok(ty::PredicateKind::decode(decoder)?)
}
ty::PredicateKind::decode(decoder)?
}))
}
}
@ -471,3 +471,28 @@ macro_rules! implement_ty_decoder {
}
}
}
macro_rules! impl_binder_encode_decode {
($($t:ty),+ $(,)?) => {
$(
impl<'tcx, E: TyEncoder<'tcx>> Encodable<E> for ty::Binder<$t> {
fn encode(&self, e: &mut E) -> Result<(), E::Error> {
self.as_ref().skip_binder().encode(e)
}
}
impl<'tcx, D: TyDecoder<'tcx>> Decodable<D> for ty::Binder<$t> {
fn decode(decoder: &mut D) -> Result<Self, D::Error> {
Ok(ty::Binder::bind(Decodable::decode(decoder)?))
}
}
)*
}
}
impl_binder_encode_decode! {
&'tcx ty::List<Ty<'tcx>>,
ty::FnSig<'tcx>,
ty::ExistentialPredicate<'tcx>,
ty::TraitRef<'tcx>,
Vec<ty::GeneratorInteriorTypeCause<'tcx>>,
}

2
compiler/rustc_middle/src/ty/mod.rs
View file

@ -1081,7 +1081,7 @@ impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Predicate<'tcx> {
}
}
#[derive(Clone, Copy, PartialEq, Eq, Hash)]
#[derive(Clone, Copy, PartialEq, Eq, Hash, TyEncodable, TyDecodable)]
#[derive(HashStable, TypeFoldable)]
pub enum PredicateKind<'tcx> {
/// Corresponds to `where Foo: Bar<A, B, C>`. `Foo` here would be

2
compiler/rustc_middle/src/ty/sty.rs
View file

@ -955,7 +955,7 @@ impl<'tcx> PolyExistentialTraitRef<'tcx> {
/// erase, or otherwise "discharge" these bound vars, we change the
/// type from `Binder<T>` to just `T` (see
/// e.g., `liberate_late_bound_regions`).
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, TyEncodable, TyDecodable)]
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
pub struct Binder<T>(T);
impl<T> Binder<T> {