intern PredicateKind

src/librustc_infer/traits/mod.rs

@@ -59,7 +59,7 @@ pub type TraitObligation<'tcx> = Obligation<'tcx, ty::PolyTraitPredicate<'tcx>>;
 
 // `PredicateObligation` is used a lot. Make sure it doesn't unintentionally get bigger.
 #[cfg(target_arch = "x86_64")]
-static_assert_size!(PredicateObligation<'_>, 112);
+static_assert_size!(PredicateObligation<'_>, 88);
 
 pub type Obligations<'tcx, O> = Vec<Obligation<'tcx, O>>;
 pub type PredicateObligations<'tcx> = Vec<PredicateObligation<'tcx>>;

src/librustc_middle/ty/context.rs

@@ -29,10 +29,9 @@ use crate::ty::{self, DefIdTree, Ty, TypeAndMut};
 use crate::ty::{AdtDef, AdtKind, Const, Region};
 use crate::ty::{BindingMode, BoundVar};
 use crate::ty::{ConstVid, FloatVar, FloatVid, IntVar, IntVid, TyVar, TyVid};
-use crate::ty::{
-    ExistentialPredicate, InferTy, ParamTy, PolyFnSig, Predicate, PredicateKind, ProjectionTy,
-};
+use crate::ty::{ExistentialPredicate, Predicate, PredicateKind};
 use crate::ty::{InferConst, ParamConst};
+use crate::ty::{InferTy, ParamTy, PolyFnSig, ProjectionTy};
 use crate::ty::{List, TyKind, TyS};
 use rustc_ast::ast;
 use rustc_ast::expand::allocator::AllocatorKind;
@@ -91,6 +90,7 @@ pub struct CtxtInterners<'tcx> {
     canonical_var_infos: InternedSet<'tcx, List<CanonicalVarInfo>>,
     region: InternedSet<'tcx, RegionKind>,
     existential_predicates: InternedSet<'tcx, List<ExistentialPredicate<'tcx>>>,
+    predicate_kind: InternedSet<'tcx, PredicateKind<'tcx>>,
     predicates: InternedSet<'tcx, List<Predicate<'tcx>>>,
     projs: InternedSet<'tcx, List<ProjectionKind>>,
     place_elems: InternedSet<'tcx, List<PlaceElem<'tcx>>>,
@@ -109,6 +109,7 @@ impl<'tcx> CtxtInterners<'tcx> {
             region: Default::default(),
             existential_predicates: Default::default(),
             canonical_var_infos: Default::default(),
+            predicate_kind: Default::default(),
             predicates: Default::default(),
             projs: Default::default(),
             place_elems: Default::default(),
@@ -1579,6 +1580,7 @@ macro_rules! nop_list_lift {
 nop_lift! {type_; Ty<'a> => Ty<'tcx>}
 nop_lift! {region; Region<'a> => Region<'tcx>}
 nop_lift! {const_; &'a Const<'a> => &'tcx Const<'tcx>}
+nop_lift! {predicate_kind; &'a PredicateKind<'a> => &'tcx PredicateKind<'tcx>}
 
 nop_list_lift! {type_list; Ty<'a> => Ty<'tcx>}
 nop_list_lift! {existential_predicates; ExistentialPredicate<'a> => ExistentialPredicate<'tcx>}
@@ -2017,8 +2019,14 @@ impl<'tcx> Borrow<[traits::ChalkEnvironmentClause<'tcx>]>
     }
 }
 
+impl<'tcx> Borrow<PredicateKind<'tcx>> for Interned<'tcx, PredicateKind<'tcx>> {
+    fn borrow<'a>(&'a self) -> &'a PredicateKind<'tcx> {
+        &self.0
+    }
+}
+
 macro_rules! direct_interners {
-    ($($name:ident: $method:ident($ty:ty)),+) => {
+    ($($name:ident: $method:ident($ty:ty),)+) => {
         $(impl<'tcx> PartialEq for Interned<'tcx, $ty> {
             fn eq(&self, other: &Self) -> bool {
                 self.0 == other.0
@@ -2043,7 +2051,11 @@ macro_rules! direct_interners {
     }
 }
 
-direct_interners!(region: mk_region(RegionKind), const_: mk_const(Const<'tcx>));
+direct_interners!(
+    region: mk_region(RegionKind),
+    const_: mk_const(Const<'tcx>),
+    predicate_kind: intern_predicate_kind(PredicateKind<'tcx>),
+);
 
 macro_rules! slice_interners {
     ($($field:ident: $method:ident($ty:ty)),+) => (
@@ -2107,6 +2119,7 @@ impl<'tcx> TyCtxt<'tcx> {
 
     #[inline]
     pub fn mk_predicate(&self, kind: PredicateKind<'tcx>) -> Predicate<'tcx> {
+        let kind = self.intern_predicate_kind(kind);
         Predicate { kind }
     }
 

src/librustc_middle/ty/mod.rs

@@ -1017,14 +1017,14 @@ impl<'tcx> GenericPredicates<'tcx> {
 }
 
 #[derive(Clone, Copy, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Lift)]
-#[derive(HashStable, TypeFoldable)]
+#[derive(HashStable)]
 pub struct Predicate<'tcx> {
-    kind: PredicateKind<'tcx>,
+    kind: &'tcx PredicateKind<'tcx>,
 }
 
 impl Predicate<'tcx> {
     pub fn kind(&self) -> PredicateKind<'tcx> {
-        self.kind
+        *self.kind
     }
 }
 

src/librustc_middle/ty/structural_impls.rs

@@ -987,6 +987,16 @@ impl<'tcx> TypeFoldable<'tcx> for ty::Region<'tcx> {
     }
 }
 
+impl<'tcx> TypeFoldable<'tcx> for ty::Predicate<'tcx> {
+    fn super_fold_with<F: TypeFolder<'tcx>>(&self, folder: &mut F) -> Self {
+        folder.tcx().mk_predicate(ty::PredicateKind::super_fold_with(self.kind, folder))
+    }
+
+    fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
+        ty::PredicateKind::super_visit_with(self.kind, visitor)
+    }
+}
+
 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ty::Predicate<'tcx>> {
     fn super_fold_with<F: TypeFolder<'tcx>>(&self, folder: &mut F) -> Self {
         fold_list(*self, folder, |tcx, v| tcx.intern_predicates(v))

src/librustc_trait_selection/traits/fulfill.rs

@@ -83,7 +83,7 @@ pub struct PendingPredicateObligation<'tcx> {
 
 // `PendingPredicateObligation` is used a lot. Make sure it doesn't unintentionally get bigger.
 #[cfg(target_arch = "x86_64")]
-static_assert_size!(PendingPredicateObligation<'_>, 136);
+static_assert_size!(PendingPredicateObligation<'_>, 112);
 
 impl<'a, 'tcx> FulfillmentContext<'tcx> {
     /// Creates a new fulfillment context.

src/librustc_traits/type_op.rs

@@ -6,10 +6,8 @@ use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
 use rustc_infer::traits::TraitEngineExt as _;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::subst::{GenericArg, Subst, UserSelfTy, UserSubsts};
-use rustc_middle::ty::{
-    self, FnSig, Lift, ParamEnv, ParamEnvAnd, PolyFnSig, Predicate, ToPredicate, Ty, TyCtxt,
-    TypeFoldable, Variance,
-};
+use rustc_middle::ty::{self, FnSig, Lift, PolyFnSig, Ty, TyCtxt, TypeFoldable, Variance};
+use rustc_middle::ty::{ParamEnv, ParamEnvAnd, Predicate, ToPredicate};
 use rustc_span::DUMMY_SP;
 use rustc_trait_selection::infer::InferCtxtBuilderExt;
 use rustc_trait_selection::infer::InferCtxtExt;