DropckOutlives to rustc_middle

compiler/rustc_borrowck/src/type_check/liveness/trace.rs

@@ -11,8 +11,7 @@ use rustc_mir_dataflow::impls::MaybeInitializedPlaces;
 use rustc_mir_dataflow::move_paths::{HasMoveData, MoveData, MovePathIndex};
 use rustc_mir_dataflow::points::{DenseLocationMap, PointIndex};
 use rustc_span::DUMMY_SP;
-use rustc_trait_selection::traits::query::type_op::outlives::DropckOutlives;
-use rustc_trait_selection::traits::query::type_op::{TypeOp, TypeOpOutput};
+use rustc_trait_selection::traits::query::type_op::{DropckOutlives, TypeOp, TypeOpOutput};
 use tracing::debug;
 
 use crate::location::RichLocation;
@@ -632,7 +631,7 @@ impl<'tcx> LivenessContext<'_, '_, '_, 'tcx> {
 
         match typeck
             .param_env
-            .and(DropckOutlives::new(dropped_ty))
+            .and(DropckOutlives { dropped_ty })
             .fully_perform(typeck.infcx, DUMMY_SP)
         {
             Ok(TypeOpOutput { output, constraints, .. }) => {

compiler/rustc_middle/src/query/mod.rs

@@ -65,10 +65,11 @@ use crate::query::plumbing::{
     CyclePlaceholder, DynamicQuery, query_ensure, query_ensure_error_guaranteed, query_get_at,
 };
 use crate::traits::query::{
-    CanonicalAliasGoal, CanonicalImpliedOutlivesBoundsGoal, CanonicalPredicateGoal,
-    CanonicalTyGoal, CanonicalTypeOpAscribeUserTypeGoal, CanonicalTypeOpNormalizeGoal,
-    CanonicalTypeOpProvePredicateGoal, DropckConstraint, DropckOutlivesResult,
-    MethodAutoderefStepsResult, NoSolution, NormalizationResult, OutlivesBound,
+    CanonicalAliasGoal, CanonicalDropckOutlivesGoal, CanonicalImpliedOutlivesBoundsGoal,
+    CanonicalPredicateGoal, CanonicalTyGoal, CanonicalTypeOpAscribeUserTypeGoal,
+    CanonicalTypeOpNormalizeGoal, CanonicalTypeOpProvePredicateGoal, DropckConstraint,
+    DropckOutlivesResult, MethodAutoderefStepsResult, NoSolution, NormalizationResult,
+    OutlivesBound,
 };
 use crate::traits::{
     CodegenObligationError, DynCompatibilityViolation, EvaluationResult, ImplSource,
@@ -2069,12 +2070,12 @@ rustc_queries! {
     /// Do not call this query directly:
     /// invoke `DropckOutlives::new(dropped_ty)).fully_perform(typeck.infcx)` instead.
     query dropck_outlives(
-        goal: CanonicalTyGoal<'tcx>
+        goal: CanonicalDropckOutlivesGoal<'tcx>
     ) -> Result<
         &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, DropckOutlivesResult<'tcx>>>,
         NoSolution,
     > {
-        desc { "computing dropck types for `{}`", goal.value.value }
+        desc { "computing dropck types for `{}`", goal.value.value.dropped_ty }
     }
 
     /// Do not call this query directly: invoke `infcx.predicate_may_hold()` or

compiler/rustc_middle/src/traits/query.rs

@@ -51,6 +51,11 @@ pub mod type_op {
     pub struct ImpliedOutlivesBounds<'tcx> {
         pub ty: Ty<'tcx>,
     }
+
+    #[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, HashStable, TypeFoldable, TypeVisitable)]
+    pub struct DropckOutlives<'tcx> {
+        pub dropped_ty: Ty<'tcx>,
+    }
 }
 
 pub type CanonicalAliasGoal<'tcx> = Canonical<'tcx, ty::ParamEnvAnd<'tcx, ty::AliasTy<'tcx>>>;
@@ -76,6 +81,9 @@ pub type CanonicalTypeOpNormalizeGoal<'tcx, T> =
 pub type CanonicalImpliedOutlivesBoundsGoal<'tcx> =
     Canonical<'tcx, ty::ParamEnvAnd<'tcx, type_op::ImpliedOutlivesBounds<'tcx>>>;
 
+pub type CanonicalDropckOutlivesGoal<'tcx> =
+    Canonical<'tcx, ty::ParamEnvAnd<'tcx, type_op::DropckOutlives<'tcx>>>;
+
 #[derive(Clone, Debug, Default, HashStable, TypeFoldable, TypeVisitable)]
 pub struct DropckOutlivesResult<'tcx> {
     pub kinds: Vec<GenericArg<'tcx>>,

compiler/rustc_trait_selection/src/traits/query/dropck_outlives.rs

@@ -1,4 +1,5 @@
 use rustc_data_structures::fx::FxHashSet;
+use rustc_infer::traits::query::type_op::DropckOutlives;
 use rustc_middle::traits::query::{DropckConstraint, DropckOutlivesResult};
 use rustc_middle::ty::{self, EarlyBinder, ParamEnvAnd, Ty, TyCtxt};
 use rustc_span::{DUMMY_SP, Span};
@@ -88,18 +89,18 @@ pub fn trivial_dropck_outlives<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> bool {
 
 pub fn compute_dropck_outlives_inner<'tcx>(
     ocx: &ObligationCtxt<'_, 'tcx>,
-    goal: ParamEnvAnd<'tcx, Ty<'tcx>>,
+    goal: ParamEnvAnd<'tcx, DropckOutlives<'tcx>>,
 ) -> Result<DropckOutlivesResult<'tcx>, NoSolution> {
     let tcx = ocx.infcx.tcx;
-    let ParamEnvAnd { param_env, value: for_ty } = goal;
+    let ParamEnvAnd { param_env, value: DropckOutlives { dropped_ty } } = goal;
 
     let mut result = DropckOutlivesResult { kinds: vec![], overflows: vec![] };
 
     // A stack of types left to process. Each round, we pop
     // something from the stack and invoke
     // `dtorck_constraint_for_ty_inner`. This may produce new types that
     // have to be pushed on the stack. This continues until we have explored
-    // all the reachable types from the type `for_ty`.
+    // all the reachable types from the type `dropped_ty`.
     //
     // Example: Imagine that we have the following code:
     //
@@ -129,7 +130,7 @@ pub fn compute_dropck_outlives_inner<'tcx>(
     // lead to us trying to push `A` a second time -- to prevent
     // infinite recursion, we notice that `A` was already pushed
     // once and stop.
-    let mut ty_stack = vec![(for_ty, 0)];
+    let mut ty_stack = vec![(dropped_ty, 0)];
 
     // Set used to detect infinite recursion.
     let mut ty_set = FxHashSet::default();

compiler/rustc_trait_selection/src/traits/query/type_op/outlives.rs

@@ -1,23 +1,12 @@
-use rustc_macros::{HashStable, TypeFoldable, TypeVisitable};
 use rustc_middle::traits::query::{DropckOutlivesResult, NoSolution};
-use rustc_middle::ty::{ParamEnvAnd, Ty, TyCtxt};
+use rustc_middle::ty::{ParamEnvAnd, TyCtxt};
 
 use crate::infer::canonical::{Canonical, CanonicalQueryResponse};
 use crate::traits::ObligationCtxt;
 use crate::traits::query::dropck_outlives::{
     compute_dropck_outlives_inner, trivial_dropck_outlives,
 };
-
-#[derive(Copy, Clone, Debug, HashStable, TypeFoldable, TypeVisitable)]
-pub struct DropckOutlives<'tcx> {
-    dropped_ty: Ty<'tcx>,
-}
-
-impl<'tcx> DropckOutlives<'tcx> {
-    pub fn new(dropped_ty: Ty<'tcx>) -> Self {
-        DropckOutlives { dropped_ty }
-    }
-}
+use crate::traits::query::type_op::DropckOutlives;
 
 impl<'tcx> super::QueryTypeOp<'tcx> for DropckOutlives<'tcx> {
     type QueryResponse = DropckOutlivesResult<'tcx>;
@@ -33,21 +22,13 @@ impl<'tcx> super::QueryTypeOp<'tcx> for DropckOutlives<'tcx> {
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Self>>,
     ) -> Result<CanonicalQueryResponse<'tcx, Self::QueryResponse>, NoSolution> {
-        // FIXME convert to the type expected by the `dropck_outlives`
-        // query. This should eventually be fixed by changing the
-        // *underlying query*.
-        let canonicalized = canonicalized.unchecked_map(|ParamEnvAnd { param_env, value }| {
-            let DropckOutlives { dropped_ty } = value;
-            param_env.and(dropped_ty)
-        });
-
         tcx.dropck_outlives(canonicalized)
     }
 
     fn perform_locally_with_next_solver(
         ocx: &ObligationCtxt<'_, 'tcx>,
         key: ParamEnvAnd<'tcx, Self>,
     ) -> Result<Self::QueryResponse, NoSolution> {
-        compute_dropck_outlives_inner(ocx, key.param_env.and(key.value.dropped_ty))
+        compute_dropck_outlives_inner(ocx, key.param_env.and(key.value))
     }
 }

compiler/rustc_traits/src/dropck_outlives.rs

@@ -10,7 +10,7 @@ use rustc_trait_selection::infer::InferCtxtBuilderExt;
 use rustc_trait_selection::traits::query::dropck_outlives::{
     compute_dropck_outlives_inner, dtorck_constraint_for_ty_inner,
 };
-use rustc_trait_selection::traits::query::{CanonicalTyGoal, NoSolution};
+use rustc_trait_selection::traits::query::{CanonicalDropckOutlivesGoal, NoSolution};
 use tracing::debug;
 
 pub(crate) fn provide(p: &mut Providers) {
@@ -19,7 +19,7 @@ pub(crate) fn provide(p: &mut Providers) {
 
 fn dropck_outlives<'tcx>(
     tcx: TyCtxt<'tcx>,
-    canonical_goal: CanonicalTyGoal<'tcx>,
+    canonical_goal: CanonicalDropckOutlivesGoal<'tcx>,
 ) -> Result<&'tcx Canonical<'tcx, QueryResponse<'tcx, DropckOutlivesResult<'tcx>>>, NoSolution> {
     debug!("dropck_outlives(goal={:#?})", canonical_goal);