Uplift AliasTy

compiler/rustc_errors/src/diagnostic_impls.rs

@@ -106,6 +106,12 @@ impl<I: rustc_type_ir::Interner> IntoDiagArg for rustc_type_ir::ExistentialTrait
     }
 }
 
+impl<I: rustc_type_ir::Interner> IntoDiagArg for rustc_type_ir::UnevaluatedConst<I> {
+    fn into_diag_arg(self) -> rustc_errors::DiagArgValue {
+        format!("{self:?}").into_diag_arg()
+    }
+}
+
 into_diag_arg_for_number!(i8, u8, i16, u16, i32, u32, i64, u64, i128, u128, isize, usize);
 
 impl IntoDiagArg for bool {

compiler/rustc_middle/src/ty/consts.rs

@@ -7,8 +7,7 @@ use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::LocalDefId;
 use rustc_macros::{HashStable, TyDecodable, TyEncodable};
-use rustc_type_ir::ConstKind as IrConstKind;
-use rustc_type_ir::{TypeFlags, WithCachedTypeInfo};
+use rustc_type_ir::{self as ir, TypeFlags, WithCachedTypeInfo};
 
 mod int;
 mod kind;
@@ -20,7 +19,8 @@ use rustc_span::Span;
 use rustc_span::DUMMY_SP;
 pub use valtree::*;
 
-pub type ConstKind<'tcx> = IrConstKind<TyCtxt<'tcx>>;
+pub type ConstKind<'tcx> = ir::ConstKind<TyCtxt<'tcx>>;
+pub type UnevaluatedConst<'tcx> = ir::UnevaluatedConst<TyCtxt<'tcx>>;
 
 #[cfg(target_pointer_width = "64")]
 rustc_data_structures::static_assert_size!(ConstKind<'_>, 32);
@@ -184,9 +184,21 @@ impl<'tcx> rustc_type_ir::inherent::Const<TyCtxt<'tcx>> for Const<'tcx> {
         Const::new_bound(tcx, debruijn, var, ty)
     }
 
+    fn new_unevaluated(
+        interner: TyCtxt<'tcx>,
+        uv: ty::UnevaluatedConst<'tcx>,
+        ty: Ty<'tcx>,
+    ) -> Self {
+        Const::new_unevaluated(interner, uv, ty)
+    }
+
     fn ty(self) -> Ty<'tcx> {
         self.ty()
     }
+
+    fn into_term(self) -> ty::Term<'tcx> {
+        self.into()
+    }
 }
 
 impl<'tcx> Const<'tcx> {

compiler/rustc_middle/src/ty/consts/kind.rs

@@ -1,30 +1,15 @@
 use super::Const;
 use crate::mir;
 use crate::ty::abstract_const::CastKind;
-use crate::ty::GenericArgsRef;
 use crate::ty::{self, visit::TypeVisitableExt as _, List, Ty, TyCtxt};
-use rustc_hir::def_id::DefId;
-use rustc_macros::{HashStable, TyDecodable, TyEncodable, TypeFoldable, TypeVisitable};
+use rustc_macros::{extension, HashStable, TyDecodable, TyEncodable, TypeFoldable, TypeVisitable};
 
-/// An unevaluated (potentially generic) constant used in the type-system.
-#[derive(Copy, Clone, Eq, PartialEq, TyEncodable, TyDecodable)]
-#[derive(Hash, HashStable, TypeFoldable, TypeVisitable)]
-pub struct UnevaluatedConst<'tcx> {
-    pub def: DefId,
-    pub args: GenericArgsRef<'tcx>,
-}
-
-impl rustc_errors::IntoDiagArg for UnevaluatedConst<'_> {
-    fn into_diag_arg(self) -> rustc_errors::DiagArgValue {
-        format!("{self:?}").into_diag_arg()
-    }
-}
-
-impl<'tcx> UnevaluatedConst<'tcx> {
+#[extension(pub(crate) trait UnevaluatedConstEvalExt<'tcx>)]
+impl<'tcx> ty::UnevaluatedConst<'tcx> {
     /// FIXME(RalfJung): I cannot explain what this does or why it makes sense, but not doing this
     /// hurts performance.
     #[inline]
-    pub(crate) fn prepare_for_eval(
+    fn prepare_for_eval(
         self,
         tcx: TyCtxt<'tcx>,
         param_env: ty::ParamEnv<'tcx>,
@@ -55,13 +40,6 @@ impl<'tcx> UnevaluatedConst<'tcx> {
     }
 }
 
-impl<'tcx> UnevaluatedConst<'tcx> {
-    #[inline]
-    pub fn new(def: DefId, args: GenericArgsRef<'tcx>) -> UnevaluatedConst<'tcx> {
-        UnevaluatedConst { def, args }
-    }
-}
-
 #[derive(Copy, Clone, Eq, PartialEq, Hash)]
 #[derive(HashStable, TyEncodable, TyDecodable, TypeVisitable, TypeFoldable)]
 pub enum Expr<'tcx> {

compiler/rustc_middle/src/ty/context.rs

@@ -76,6 +76,7 @@ use rustc_type_ir::TyKind::*;
 use rustc_type_ir::WithCachedTypeInfo;
 use rustc_type_ir::{CollectAndApply, Interner, TypeFlags};
 
+use std::assert_matches::assert_matches;
 use std::borrow::Borrow;
 use std::cmp::Ordering;
 use std::fmt;
@@ -91,67 +92,125 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
     type DefiningOpaqueTypes = &'tcx ty::List<LocalDefId>;
     type AdtDef = ty::AdtDef<'tcx>;
     type GenericArgs = ty::GenericArgsRef<'tcx>;
+    type GenericArgsSlice = &'tcx [ty::GenericArg<'tcx>];
     type GenericArg = ty::GenericArg<'tcx>;
-    type Term = ty::Term<'tcx>;
 
+    type Term = ty::Term<'tcx>;
     type Binder<T: TypeVisitable<TyCtxt<'tcx>>> = Binder<'tcx, T>;
     type BoundVars = &'tcx List<ty::BoundVariableKind>;
     type BoundVar = ty::BoundVariableKind;
-    type CanonicalVars = CanonicalVarInfos<'tcx>;
 
+    type CanonicalVars = CanonicalVarInfos<'tcx>;
     type Ty = Ty<'tcx>;
     type Tys = &'tcx List<Ty<'tcx>>;
-    type AliasTy = ty::AliasTy<'tcx>;
     type ParamTy = ParamTy;
     type BoundTy = ty::BoundTy;
     type PlaceholderTy = ty::PlaceholderType;
-    type ErrorGuaranteed = ErrorGuaranteed;
 
+    type ErrorGuaranteed = ErrorGuaranteed;
     type BoundExistentialPredicates = &'tcx List<PolyExistentialPredicate<'tcx>>;
     type PolyFnSig = PolyFnSig<'tcx>;
     type AllocId = crate::mir::interpret::AllocId;
-    type Pat = Pattern<'tcx>;
 
+    type Pat = Pattern<'tcx>;
     type Const = ty::Const<'tcx>;
     type AliasConst = ty::UnevaluatedConst<'tcx>;
     type PlaceholderConst = ty::PlaceholderConst;
     type ParamConst = ty::ParamConst;
     type BoundConst = ty::BoundVar;
     type ValueConst = ty::ValTree<'tcx>;
-    type ExprConst = ty::Expr<'tcx>;
 
+    type ExprConst = ty::Expr<'tcx>;
     type Region = Region<'tcx>;
     type EarlyParamRegion = ty::EarlyParamRegion;
     type LateParamRegion = ty::LateParamRegion;
     type BoundRegion = ty::BoundRegion;
     type InferRegion = ty::RegionVid;
-    type PlaceholderRegion = ty::PlaceholderRegion;
 
+    type PlaceholderRegion = ty::PlaceholderRegion;
     type Predicate = Predicate<'tcx>;
     type TraitPredicate = ty::TraitPredicate<'tcx>;
     type RegionOutlivesPredicate = ty::RegionOutlivesPredicate<'tcx>;
     type TypeOutlivesPredicate = ty::TypeOutlivesPredicate<'tcx>;
     type ProjectionPredicate = ty::ProjectionPredicate<'tcx>;
-    type AliasTerm = ty::AliasTerm<'tcx>;
     type NormalizesTo = ty::NormalizesTo<'tcx>;
     type SubtypePredicate = ty::SubtypePredicate<'tcx>;
     type CoercePredicate = ty::CoercePredicate<'tcx>;
     type ClosureKind = ty::ClosureKind;
-    type Clauses = ty::Clauses<'tcx>;
 
+    type Clauses = ty::Clauses<'tcx>;
     fn mk_canonical_var_infos(self, infos: &[ty::CanonicalVarInfo<Self>]) -> Self::CanonicalVars {
         self.mk_canonical_var_infos(infos)
     }
 
     type GenericsOf = &'tcx ty::Generics;
+
     fn generics_of(self, def_id: DefId) -> &'tcx ty::Generics {
         self.generics_of(def_id)
     }
 
+    fn type_of_instantiated(self, def_id: DefId, args: ty::GenericArgsRef<'tcx>) -> Ty<'tcx> {
+        self.type_of(def_id).instantiate(self, args)
+    }
+
+    fn alias_ty_kind(self, alias: ty::AliasTy<'tcx>) -> ty::AliasTyKind {
+        match self.def_kind(alias.def_id) {
+            DefKind::AssocTy => {
+                if let DefKind::Impl { of_trait: false } = self.def_kind(self.parent(alias.def_id))
+                {
+                    ty::Inherent
+                } else {
+                    ty::Projection
+                }
+            }
+            DefKind::OpaqueTy => ty::Opaque,
+            DefKind::TyAlias => ty::Weak,
+            kind => bug!("unexpected DefKind in AliasTy: {kind:?}"),
+        }
+    }
+
+    fn alias_term_kind(self, alias: ty::AliasTerm<'tcx>) -> ty::AliasTermKind {
+        match self.def_kind(alias.def_id) {
+            DefKind::AssocTy => {
+                if let DefKind::Impl { of_trait: false } = self.def_kind(self.parent(alias.def_id))
+                {
+                    ty::AliasTermKind::InherentTy
+                } else {
+                    ty::AliasTermKind::ProjectionTy
+                }
+            }
+            DefKind::OpaqueTy => ty::AliasTermKind::OpaqueTy,
+            DefKind::TyAlias => ty::AliasTermKind::WeakTy,
+            DefKind::AssocConst => ty::AliasTermKind::ProjectionConst,
+            DefKind::AnonConst => ty::AliasTermKind::UnevaluatedConst,
+            kind => bug!("unexpected DefKind in AliasTy: {kind:?}"),
+        }
+    }
+
+    fn trait_ref_and_own_args_for_alias(
+        self,
+        def_id: Self::DefId,
+        args: Self::GenericArgs,
+    ) -> (rustc_type_ir::TraitRef<Self>, Self::GenericArgsSlice) {
+        // FIXME: Make sure this isn't inherent
+        assert_matches!(self.def_kind(def_id), DefKind::AssocTy | DefKind::AssocConst);
+        let trait_def_id = self.parent(def_id);
+        assert_matches!(self.def_kind(trait_def_id), DefKind::Trait);
+        let trait_generics = self.generics_of(trait_def_id);
+        (
+            ty::TraitRef::new(self, trait_def_id, args.truncate_to(self, trait_generics)),
+            &args[trait_generics.count()..],
+        )
+    }
+
     fn mk_args(self, args: &[Self::GenericArg]) -> Self::GenericArgs {
         self.mk_args(args)
     }
 
+    fn mk_args_from_iter(self, args: impl Iterator<Item = Self::GenericArg>) -> Self::GenericArgs {
+        self.mk_args_from_iter(args)
+    }
+
     fn check_and_mk_args(
         self,
         def_id: DefId,

compiler/rustc_middle/src/ty/mod.rs

@@ -96,9 +96,9 @@ pub use self::list::{List, ListWithCachedTypeInfo};
 pub use self::parameterized::ParameterizedOverTcx;
 pub use self::pattern::{Pattern, PatternKind};
 pub use self::predicate::{
-    Clause, ClauseKind, CoercePredicate, ExistentialPredicate, ExistentialPredicateStableCmpExt,
-    ExistentialProjection, ExistentialTraitRef, NormalizesTo, OutlivesPredicate,
-    PolyCoercePredicate, PolyExistentialPredicate, PolyExistentialProjection,
+    AliasTerm, Clause, ClauseKind, CoercePredicate, ExistentialPredicate,
+    ExistentialPredicateStableCmpExt, ExistentialProjection, ExistentialTraitRef, NormalizesTo,
+    OutlivesPredicate, PolyCoercePredicate, PolyExistentialPredicate, PolyExistentialProjection,
     PolyExistentialTraitRef, PolyProjectionPredicate, PolyRegionOutlivesPredicate,
     PolySubtypePredicate, PolyTraitPredicate, PolyTraitRef, PolyTypeOutlivesPredicate, Predicate,
     PredicateKind, ProjectionPredicate, RegionOutlivesPredicate, SubtypePredicate, ToPolyTraitRef,
@@ -110,11 +110,11 @@ pub use self::region::{
 };
 pub use self::rvalue_scopes::RvalueScopes;
 pub use self::sty::{
-    AliasTerm, AliasTy, Article, Binder, BoundTy, BoundTyKind, BoundVariableKind,
-    CanonicalPolyFnSig, ClosureArgs, ClosureArgsParts, CoroutineArgs, CoroutineArgsParts,
-    CoroutineClosureArgs, CoroutineClosureArgsParts, CoroutineClosureSignature, FnSig, GenSig,
-    InlineConstArgs, InlineConstArgsParts, ParamConst, ParamTy, PolyFnSig, TyKind, TypeAndMut,
-    UpvarArgs, VarianceDiagInfo,
+    AliasTy, Article, Binder, BoundTy, BoundTyKind, BoundVariableKind, CanonicalPolyFnSig,
+    ClosureArgs, ClosureArgsParts, CoroutineArgs, CoroutineArgsParts, CoroutineClosureArgs,
+    CoroutineClosureArgsParts, CoroutineClosureSignature, FnSig, GenSig, InlineConstArgs,
+    InlineConstArgsParts, ParamConst, ParamTy, PolyFnSig, TyKind, TypeAndMut, UpvarArgs,
+    VarianceDiagInfo,
 };
 pub use self::trait_def::TraitDef;
 pub use self::typeck_results::{

compiler/rustc_middle/src/ty/predicate.rs

@@ -13,6 +13,7 @@ use crate::ty::{
 };
 
 pub type TraitRef<'tcx> = ir::TraitRef<TyCtxt<'tcx>>;
+pub type AliasTerm<'tcx> = ir::AliasTerm<TyCtxt<'tcx>>;
 pub type ProjectionPredicate<'tcx> = ir::ProjectionPredicate<TyCtxt<'tcx>>;
 pub type ExistentialPredicate<'tcx> = ir::ExistentialPredicate<TyCtxt<'tcx>>;
 pub type ExistentialTraitRef<'tcx> = ir::ExistentialTraitRef<TyCtxt<'tcx>>;

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -3038,6 +3038,33 @@ define_print! {
         p!(write("<{} as {}>", self.self_ty(), self.print_only_trait_path()))
     }
 
+    ty::AliasTy<'tcx> {
+        let alias_term: ty::AliasTerm<'tcx> = (*self).into();
+        p!(print(alias_term))
+    }
+
+    ty::AliasTerm<'tcx> {
+        match self.kind(cx.tcx()) {
+            ty::AliasTermKind::InherentTy => p!(pretty_print_inherent_projection(*self)),
+            ty::AliasTermKind::ProjectionTy
+            | ty::AliasTermKind::WeakTy
+            | ty::AliasTermKind::OpaqueTy
+            | ty::AliasTermKind::UnevaluatedConst
+            | ty::AliasTermKind::ProjectionConst => {
+                // If we're printing verbosely, or don't want to invoke queries
+                // (`is_impl_trait_in_trait`), then fall back to printing the def path.
+                // This is likely what you want if you're debugging the compiler anyways.
+                if !(cx.should_print_verbose() || with_reduced_queries())
+                    && cx.tcx().is_impl_trait_in_trait(self.def_id)
+                {
+                    return cx.pretty_print_opaque_impl_type(self.def_id, self.args);
+                } else {
+                    p!(print_def_path(self.def_id, self.args));
+                }
+            }
+        }
+    }
+
     ty::TraitPredicate<'tcx> {
         p!(print(self.trait_ref.self_ty()), ": ");
         p!(pretty_print_bound_constness(self.trait_ref));
@@ -3205,33 +3232,6 @@ define_print_and_forward_display! {
       }
     }
 
-    ty::AliasTy<'tcx> {
-        let alias_term: ty::AliasTerm<'tcx> = (*self).into();
-        p!(print(alias_term))
-    }
-
-    ty::AliasTerm<'tcx> {
-        match self.kind(cx.tcx()) {
-            ty::AliasTermKind::InherentTy => p!(pretty_print_inherent_projection(*self)),
-            ty::AliasTermKind::ProjectionTy
-            | ty::AliasTermKind::WeakTy
-            | ty::AliasTermKind::OpaqueTy
-            | ty::AliasTermKind::UnevaluatedConst
-            | ty::AliasTermKind::ProjectionConst => {
-                // If we're printing verbosely, or don't want to invoke queries
-                // (`is_impl_trait_in_trait`), then fall back to printing the def path.
-                // This is likely what you want if you're debugging the compiler anyways.
-                if !(cx.should_print_verbose() || with_reduced_queries())
-                    && cx.tcx().is_impl_trait_in_trait(self.def_id)
-                {
-                    return cx.pretty_print_opaque_impl_type(self.def_id, self.args);
-                } else {
-                    p!(print_def_path(self.def_id, self.args));
-                }
-            }
-        }
-    }
-
     ty::Predicate<'tcx> {
         p!(print(self.kind()))
     }