Auto merge of #66454 - cjgillot:lift, r=Zoxc

Derive Lift using a proc-macro

Based on #66384

r? @Zoxc

Author: bors

src/librustc/infer/canonical/mod.rs

@@ -32,7 +32,7 @@ use std::ops::Index;
 use syntax::source_map::Span;
 use crate::ty::fold::TypeFoldable;
 use crate::ty::subst::GenericArg;
-use crate::ty::{self, BoundVar, Lift, List, Region, TyCtxt};
+use crate::ty::{self, BoundVar, List, Region, TyCtxt};
 
 mod canonicalizer;
 
@@ -44,7 +44,7 @@ mod substitute;
 /// variables have been rewritten to "canonical vars". These are
 /// numbered starting from 0 in order of first appearance.
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, RustcDecodable, RustcEncodable)]
-#[derive(HashStable, TypeFoldable)]
+#[derive(HashStable, TypeFoldable, Lift)]
 pub struct Canonical<'tcx, V> {
     pub max_universe: ty::UniverseIndex,
     pub variables: CanonicalVarInfos<'tcx>,
@@ -65,7 +65,7 @@ impl<'tcx> UseSpecializedDecodable for CanonicalVarInfos<'tcx> {}
 /// variables. You will need to supply it later to instantiate the
 /// canonicalized query response.
 #[derive(Clone, Debug, PartialEq, Eq, Hash, RustcDecodable, RustcEncodable)]
-#[derive(HashStable, TypeFoldable)]
+#[derive(HashStable, TypeFoldable, Lift)]
 pub struct CanonicalVarValues<'tcx> {
     pub var_values: IndexVec<BoundVar, GenericArg<'tcx>>,
 }
@@ -188,15 +188,15 @@ pub enum CanonicalTyVarKind {
 /// After we execute a query with a canonicalized key, we get back a
 /// `Canonical<QueryResponse<..>>`. You can use
 /// `instantiate_query_result` to access the data in this result.
-#[derive(Clone, Debug, HashStable, TypeFoldable)]
+#[derive(Clone, Debug, HashStable, TypeFoldable, Lift)]
 pub struct QueryResponse<'tcx, R> {
     pub var_values: CanonicalVarValues<'tcx>,
     pub region_constraints: QueryRegionConstraints<'tcx>,
     pub certainty: Certainty,
     pub value: R,
 }
 
-#[derive(Clone, Debug, Default, HashStable, TypeFoldable)]
+#[derive(Clone, Debug, Default, HashStable, TypeFoldable, Lift)]
 pub struct QueryRegionConstraints<'tcx> {
     pub outlives: Vec<QueryOutlivesConstraint<'tcx>>,
     pub member_constraints: Vec<MemberConstraint<'tcx>>,
@@ -469,13 +469,6 @@ CloneTypeFoldableImpls! {
     }
 }
 
-BraceStructLiftImpl! {
-    impl<'a, 'tcx, T> Lift<'tcx> for Canonical<'a, T> {
-        type Lifted = Canonical<'tcx, T::Lifted>;
-        max_universe, variables, value
-    } where T: Lift<'tcx>
-}
-
 impl<'tcx> CanonicalVarValues<'tcx> {
     pub fn len(&self) -> usize {
         self.var_values.len()
@@ -521,27 +514,6 @@ impl<'a, 'tcx> IntoIterator for &'a CanonicalVarValues<'tcx> {
     }
 }
 
-BraceStructLiftImpl! {
-    impl<'a, 'tcx> Lift<'tcx> for CanonicalVarValues<'a> {
-        type Lifted = CanonicalVarValues<'tcx>;
-        var_values,
-    }
-}
-
-BraceStructLiftImpl! {
-    impl<'a, 'tcx, R> Lift<'tcx> for QueryResponse<'a, R> {
-        type Lifted = QueryResponse<'tcx, R::Lifted>;
-        var_values, region_constraints, certainty, value
-    } where R: Lift<'tcx>
-}
-
-BraceStructLiftImpl! {
-    impl<'a, 'tcx> Lift<'tcx> for QueryRegionConstraints<'a> {
-        type Lifted = QueryRegionConstraints<'tcx>;
-        outlives, member_constraints
-    }
-}
-
 impl<'tcx> Index<BoundVar> for CanonicalVarValues<'tcx> {
     type Output = GenericArg<'tcx>;
 

src/librustc/infer/region_constraints/mod.rs

@@ -151,7 +151,7 @@ impl Constraint<'_> {
 /// ```
 /// R0 member of [O1..On]
 /// ```
-#[derive(Debug, Clone, HashStable, TypeFoldable)]
+#[derive(Debug, Clone, HashStable, TypeFoldable, Lift)]
 pub struct MemberConstraint<'tcx> {
     /// The `DefId` of the opaque type causing this constraint: used for error reporting.
     pub opaque_type_def_id: DefId,
@@ -169,13 +169,6 @@ pub struct MemberConstraint<'tcx> {
     pub choice_regions: Lrc<Vec<Region<'tcx>>>,
 }
 
-BraceStructLiftImpl! {
-    impl<'a, 'tcx> Lift<'tcx> for MemberConstraint<'a> {
-        type Lifted = MemberConstraint<'tcx>;
-        opaque_type_def_id, definition_span, hidden_ty, member_region, choice_regions
-    }
-}
-
 /// `VerifyGenericBound(T, _, R, RS)`: the parameter type `T` (or
 /// associated type) must outlive the region `R`. `T` is known to
 /// outlive `RS`. Therefore, verify that `R <= RS[i]` for some

src/librustc/macros.rs

@@ -253,77 +253,6 @@ macro_rules! CloneTypeFoldableAndLiftImpls {
     }
 }
 
-#[macro_export]
-macro_rules! BraceStructLiftImpl {
-    (impl<$($p:tt),*> Lift<$tcx:tt> for $s:path {
-        type Lifted = $lifted:ty;
-        $($field:ident),* $(,)?
-    } $(where $($wc:tt)*)*) => {
-        impl<$($p),*> $crate::ty::Lift<$tcx> for $s
-            $(where $($wc)*)*
-        {
-            type Lifted = $lifted;
-
-            fn lift_to_tcx(&self, tcx: TyCtxt<$tcx>) -> Option<$lifted> {
-                $(let $field = tcx.lift(&self.$field)?;)*
-                Some(Self::Lifted { $($field),* })
-            }
-        }
-    };
-}
-
-#[macro_export]
-macro_rules! EnumLiftImpl {
-    (impl<$($p:tt),*> Lift<$tcx:tt> for $s:path {
-        type Lifted = $lifted:ty;
-        $($variants:tt)*
-    } $(where $($wc:tt)*)*) => {
-        impl<$($p),*> $crate::ty::Lift<$tcx> for $s
-            $(where $($wc)*)*
-        {
-            type Lifted = $lifted;
-
-            fn lift_to_tcx(&self, tcx: TyCtxt<$tcx>) -> Option<$lifted> {
-                EnumLiftImpl!(@Variants(self, tcx) input($($variants)*) output())
-            }
-        }
-    };
-
-    (@Variants($this:expr, $tcx:expr) input() output($($output:tt)*)) => {
-        match $this {
-            $($output)*
-        }
-    };
-
-    (@Variants($this:expr, $tcx:expr)
-     input( ($variant:path) ( $($variant_arg:ident),* ) , $($input:tt)*)
-     output( $($output:tt)*) ) => {
-        EnumLiftImpl!(
-            @Variants($this, $tcx)
-                input($($input)*)
-                output(
-                    $variant ( $($variant_arg),* ) => {
-                        Some($variant ( $($tcx.lift($variant_arg)?),* ))
-                    }
-                    $($output)*
-                )
-        )
-    };
-
-    (@Variants($this:expr, $tcx:expr)
-     input( ($variant:path), $($input:tt)*)
-     output( $($output:tt)*) ) => {
-        EnumLiftImpl!(
-            @Variants($this, $tcx)
-                input($($input)*)
-                output(
-                    $variant => { Some($variant) }
-                    $($output)*
-                )
-        )
-    };
-}
-
 #[macro_export]
 macro_rules! EnumTypeFoldableImpl {
     (impl<$($p:tt),*> TypeFoldable<$tcx:tt> for $s:path {

src/librustc/mir/interpret/mod.rs

@@ -124,7 +124,8 @@ use rustc_macros::HashStable;
 use byteorder::{WriteBytesExt, ReadBytesExt, LittleEndian, BigEndian};
 
 /// Uniquely identifies a specific constant or static.
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, RustcEncodable, RustcDecodable, HashStable)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, RustcEncodable, RustcDecodable)]
+#[derive(HashStable, Lift)]
 pub struct GlobalId<'tcx> {
     /// For a constant or static, the `Instance` of the item itself.
     /// For a promoted global, the `Instance` of the function they belong to.

src/librustc/traits/mod.rs

@@ -334,27 +334,27 @@ pub type TraitObligations<'tcx> = Vec<TraitObligation<'tcx>>;
 /// are used for representing the trait system in the form of
 /// logic programming clauses. They are part of the interface
 /// for the chalk SLG solver.
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, HashStable, TypeFoldable)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, HashStable, TypeFoldable, Lift)]
 pub enum WhereClause<'tcx> {
     Implemented(ty::TraitPredicate<'tcx>),
     ProjectionEq(ty::ProjectionPredicate<'tcx>),
     RegionOutlives(ty::RegionOutlivesPredicate<'tcx>),
     TypeOutlives(ty::TypeOutlivesPredicate<'tcx>),
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, HashStable, TypeFoldable)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, HashStable, TypeFoldable, Lift)]
 pub enum WellFormed<'tcx> {
     Trait(ty::TraitPredicate<'tcx>),
     Ty(Ty<'tcx>),
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, HashStable, TypeFoldable)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, HashStable, TypeFoldable, Lift)]
 pub enum FromEnv<'tcx> {
     Trait(ty::TraitPredicate<'tcx>),
     Ty(Ty<'tcx>),
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, HashStable, TypeFoldable)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, HashStable, TypeFoldable, Lift)]
 pub enum DomainGoal<'tcx> {
     Holds(WhereClause<'tcx>),
     WellFormed(WellFormed<'tcx>),
@@ -370,7 +370,7 @@ pub enum QuantifierKind {
     Existential,
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, HashStable, TypeFoldable)]
+#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, HashStable, TypeFoldable, Lift)]
 pub enum GoalKind<'tcx> {
     Implies(Clauses<'tcx>, Goal<'tcx>),
     And(Goal<'tcx>, Goal<'tcx>),

src/librustc/traits/query/dropck_outlives.rs

@@ -79,7 +79,7 @@ impl<'cx, 'tcx> At<'cx, 'tcx> {
     }
 }
 
-#[derive(Clone, Debug, Default, TypeFoldable)]
+#[derive(Clone, Debug, Default, TypeFoldable, Lift)]
 pub struct DropckOutlivesResult<'tcx> {
     pub kinds: Vec<GenericArg<'tcx>>,
     pub overflows: Vec<Ty<'tcx>>,
@@ -152,13 +152,6 @@ impl<'tcx> FromIterator<DtorckConstraint<'tcx>> for DtorckConstraint<'tcx> {
         result
     }
 }
-BraceStructLiftImpl! {
-    impl<'a, 'tcx> Lift<'tcx> for DropckOutlivesResult<'a> {
-        type Lifted = DropckOutlivesResult<'tcx>;
-        kinds, overflows
-    }
-}
-
 impl_stable_hash_for!(struct DropckOutlivesResult<'tcx> {
     kinds, overflows
 });

src/librustc/traits/query/normalize.rs

@@ -66,7 +66,7 @@ impl<'cx, 'tcx> At<'cx, 'tcx> {
 }
 
 /// Result from the `normalize_projection_ty` query.
-#[derive(Clone, Debug, TypeFoldable)]
+#[derive(Clone, Debug, TypeFoldable, Lift)]
 pub struct NormalizationResult<'tcx> {
     /// Result of normalization.
     pub normalized_ty: Ty<'tcx>,
@@ -194,13 +194,6 @@ impl<'cx, 'tcx> TypeFolder<'tcx> for QueryNormalizer<'cx, 'tcx> {
     }
 }
 
-BraceStructLiftImpl! {
-    impl<'a, 'tcx> Lift<'tcx> for NormalizationResult<'a> {
-        type Lifted = NormalizationResult<'tcx>;
-        normalized_ty
-    }
-}
-
 impl_stable_hash_for!(struct NormalizationResult<'tcx> {
     normalized_ty
 });

src/librustc/traits/query/outlives_bounds.rs

@@ -4,7 +4,7 @@ use crate::hir;
 use syntax::source_map::Span;
 use crate::traits::{FulfillmentContext, ObligationCause, TraitEngine, TraitEngineExt};
 use crate::traits::query::NoSolution;
-use crate::ty::{self, Ty, TyCtxt};
+use crate::ty::{self, Ty};
 
 use crate::ich::StableHashingContext;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
@@ -17,22 +17,13 @@ use std::mem;
 /// case they are called implied bounds). They are fed to the
 /// `OutlivesEnv` which in turn is supplied to the region checker and
 /// other parts of the inference system.
-#[derive(Clone, Debug, TypeFoldable)]
+#[derive(Clone, Debug, TypeFoldable, Lift)]
 pub enum OutlivesBound<'tcx> {
     RegionSubRegion(ty::Region<'tcx>, ty::Region<'tcx>),
     RegionSubParam(ty::Region<'tcx>, ty::ParamTy),
     RegionSubProjection(ty::Region<'tcx>, ty::ProjectionTy<'tcx>),
 }
 
-EnumLiftImpl! {
-    impl<'a, 'tcx> Lift<'tcx> for self::OutlivesBound<'a> {
-        type Lifted = self::OutlivesBound<'tcx>;
-        (self::OutlivesBound::RegionSubRegion)(a, b),
-        (self::OutlivesBound::RegionSubParam)(a, b),
-        (self::OutlivesBound::RegionSubProjection)(a, b),
-    }
-}
-
 impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for OutlivesBound<'tcx> {
     fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
         mem::discriminant(self).hash_stable(hcx, hasher);

src/librustc/traits/query/type_op/ascribe_user_type.rs

@@ -4,7 +4,7 @@ use crate::hir::def_id::DefId;
 use crate::ty::{ParamEnvAnd, Ty, TyCtxt};
 use crate::ty::subst::UserSubsts;
 
-#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, TypeFoldable)]
+#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, TypeFoldable, Lift)]
 pub struct AscribeUserType<'tcx> {
     pub mir_ty: Ty<'tcx>,
     pub def_id: DefId,
@@ -39,13 +39,6 @@ impl<'tcx> super::QueryTypeOp<'tcx> for AscribeUserType<'tcx> {
     }
 }
 
-BraceStructLiftImpl! {
-    impl<'a, 'tcx> Lift<'tcx> for AscribeUserType<'a> {
-        type Lifted = AscribeUserType<'tcx>;
-        mir_ty, def_id, user_substs
-    }
-}
-
 impl_stable_hash_for! {
     struct AscribeUserType<'tcx> {
         mir_ty, def_id, user_substs

src/librustc/traits/query/type_op/eq.rs

@@ -2,7 +2,7 @@ use crate::infer::canonical::{Canonicalized, CanonicalizedQueryResponse};
 use crate::traits::query::Fallible;
 use crate::ty::{ParamEnvAnd, Ty, TyCtxt};
 
-#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, TypeFoldable)]
+#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, TypeFoldable, Lift)]
 pub struct Eq<'tcx> {
     pub a: Ty<'tcx>,
     pub b: Ty<'tcx>,
@@ -36,14 +36,6 @@ impl<'tcx> super::QueryTypeOp<'tcx> for Eq<'tcx> {
     }
 }
 
-BraceStructLiftImpl! {
-    impl<'a, 'tcx> Lift<'tcx> for Eq<'a> {
-        type Lifted = Eq<'tcx>;
-        a,
-        b,
-    }
-}
-
 impl_stable_hash_for! {
     struct Eq<'tcx> { a, b }
 }