1 files changed, 0 insertions, 242 deletions
diff --git a/compiler/rustc_hir_typeck/src/generator_interior/drop_ranges/record_consumed_borrow.rs b/compiler/rustc_hir_typeck/src/generator_interior/drop_ranges/record_consumed_borrow.rs
deleted file mode 100644
index 29413f080..000000000
--- a/compiler/rustc_hir_typeck/src/generator_interior/drop_ranges/record_consumed_borrow.rs
+++ /dev/null
@@ -1,242 +0,0 @@
-use super::TrackedValue;
-use crate::{
-    expr_use_visitor::{self, ExprUseVisitor},
-    FnCtxt,
-};
-use hir::{def_id::DefId, Body, HirId, HirIdMap};
-use rustc_data_structures::{fx::FxIndexSet, unord::UnordSet};
-use rustc_hir as hir;
-use rustc_middle::ty::{ParamEnv, TyCtxt};
-use rustc_middle::{
-    hir::place::{PlaceBase, Projection, ProjectionKind},
-    ty::TypeVisitableExt,
-};
-
-pub(super) fn find_consumed_and_borrowed<'a, 'tcx>(
-    fcx: &'a FnCtxt<'a, 'tcx>,
-    def_id: DefId,
-    body: &'tcx Body<'tcx>,
-) -> ConsumedAndBorrowedPlaces {
-    let mut expr_use_visitor = ExprUseDelegate::new(fcx.tcx, fcx.param_env);
-    expr_use_visitor.consume_body(fcx, def_id, body);
-    expr_use_visitor.places
-}
-
-pub(super) struct ConsumedAndBorrowedPlaces {
-    /// Records the variables/expressions that are dropped by a given expression.
-    ///
-    /// The key is the hir-id of the expression, and the value is a set or hir-ids for variables
-    /// or values that are consumed by that expression.
-    ///
-    /// Note that this set excludes "partial drops" -- for example, a statement like `drop(x.y)` is
-    /// not considered a drop of `x`, although it would be a drop of `x.y`.
-    pub(super) consumed: HirIdMap<FxIndexSet<TrackedValue>>,
-
-    /// A set of hir-ids of values or variables that are borrowed at some point within the body.
-    pub(super) borrowed: UnordSet<TrackedValue>,
-
-    /// A set of hir-ids of values or variables that are borrowed at some point within the body.
-    pub(super) borrowed_temporaries: UnordSet<HirId>,
-}
-
-/// Works with ExprUseVisitor to find interesting values for the drop range analysis.
-///
-/// Interesting values are those that are either dropped or borrowed. For dropped values, we also
-/// record the parent expression, which is the point where the drop actually takes place.
-struct ExprUseDelegate<'tcx> {
-    tcx: TyCtxt<'tcx>,
-    param_env: ParamEnv<'tcx>,
-    places: ConsumedAndBorrowedPlaces,
-}
-
-impl<'tcx> ExprUseDelegate<'tcx> {
-    fn new(tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>) -> Self {
-        Self {
-            tcx,
-            param_env,
-            places: ConsumedAndBorrowedPlaces {
-                consumed: <_>::default(),
-                borrowed: <_>::default(),
-                borrowed_temporaries: <_>::default(),
-            },
-        }
-    }
-
-    fn consume_body(&mut self, fcx: &'_ FnCtxt<'_, 'tcx>, def_id: DefId, body: &'tcx Body<'tcx>) {
-        // Run ExprUseVisitor to find where values are consumed.
-        ExprUseVisitor::new(
-            self,
-            &fcx.infcx,
-            def_id.expect_local(),
-            fcx.param_env,
-            &fcx.typeck_results.borrow(),
-        )
-        .consume_body(body);
-    }
-
-    fn mark_consumed(&mut self, consumer: HirId, target: TrackedValue) {
-        self.places.consumed.entry(consumer).or_insert_with(|| <_>::default());
-
-        debug!(?consumer, ?target, "mark_consumed");
-        self.places.consumed.get_mut(&consumer).map(|places| places.insert(target));
-    }
-
-    fn borrow_place(&mut self, place_with_id: &expr_use_visitor::PlaceWithHirId<'tcx>) {
-        self.places
-            .borrowed
-            .insert(TrackedValue::from_place_with_projections_allowed(place_with_id));
-
-        // Ordinarily a value is consumed by it's parent, but in the special case of a
-        // borrowed RValue, we create a reference that lives as long as the temporary scope
-        // for that expression (typically, the innermost statement, but sometimes the enclosing
-        // block). We record this fact here so that later in generator_interior
-        // we can use the correct scope.
-        //
-        // We special case borrows through a dereference (`&*x`, `&mut *x` where `x` is
-        // some rvalue expression), since these are essentially a copy of a pointer.
-        // In other words, this borrow does not refer to the
-        // temporary (`*x`), but to the referent (whatever `x` is a borrow of).
-        //
-        // We were considering that we might encounter problems down the line if somehow,
-        // some part of the compiler were to look at this result and try to use it to
-        // drive a borrowck-like analysis (this does not currently happen, as of this writing).
-        // But even this should be fine, because the lifetime of the dereferenced reference
-        // found in the rvalue is only significant as an intermediate 'link' to the value we
-        // are producing, and we separately track whether that value is live over a yield.
-        // Example:
-        //
-        // ```notrust
-        // fn identity<T>(x: &mut T) -> &mut T { x }
-        // let a: A = ...;
-        // let y: &'y mut A = &mut *identity(&'a mut a);
-        //                    ^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow we are talking about
-        // ```
-        //
-        // The expression `*identity(...)` is a deref of an rvalue,
-        // where the `identity(...)` (the rvalue) produces a return type
-        // of `&'rv mut A`, where `'a: 'rv`. We then assign this result to
-        // `'y`, resulting in (transitively) `'a: 'y` (i.e., while `y` is in use,
-        // `a` will be considered borrowed). Other parts of the code will ensure
-        // that if `y` is live over a yield, `&'y mut A` appears in the generator
-        // state. If `'y` is live, then any sound region analysis must conclude
-        // that `'a` is also live. So if this causes a bug, blame some other
-        // part of the code!
-        let is_deref = place_with_id
-            .place
-            .projections
-            .iter()
-            .any(|Projection { kind, .. }| *kind == ProjectionKind::Deref);
-
-        if let (false, PlaceBase::Rvalue) = (is_deref, place_with_id.place.base) {
-            self.places.borrowed_temporaries.insert(place_with_id.hir_id);
-        }
-    }
-}
-
-impl<'tcx> expr_use_visitor::Delegate<'tcx> for ExprUseDelegate<'tcx> {
-    fn consume(
-        &mut self,
-        place_with_id: &expr_use_visitor::PlaceWithHirId<'tcx>,
-        diag_expr_id: HirId,
-    ) {
-        let hir = self.tcx.hir();
-        let parent = match hir.opt_parent_id(place_with_id.hir_id) {
-            Some(parent) => parent,
-            None => place_with_id.hir_id,
-        };
-        debug!(
-            "consume {:?}; diag_expr_id={}, using parent {}",
-            place_with_id,
-            hir.node_to_string(diag_expr_id),
-            hir.node_to_string(parent)
-        );
-
-        if let Ok(tracked_value) = place_with_id.try_into() {
-            self.mark_consumed(parent, tracked_value)
-        }
-    }
-
-    fn borrow(
-        &mut self,
-        place_with_id: &expr_use_visitor::PlaceWithHirId<'tcx>,
-        diag_expr_id: HirId,
-        bk: rustc_middle::ty::BorrowKind,
-    ) {
-        debug!(
-            "borrow: place_with_id = {place_with_id:#?}, diag_expr_id={diag_expr_id:#?}, \
-            borrow_kind={bk:#?}"
-        );
-
-        self.borrow_place(place_with_id);
-    }
-
-    fn copy(
-        &mut self,
-        place_with_id: &expr_use_visitor::PlaceWithHirId<'tcx>,
-        _diag_expr_id: HirId,
-    ) {
-        debug!("copy: place_with_id = {place_with_id:?}");
-
-        self.places
-            .borrowed
-            .insert(TrackedValue::from_place_with_projections_allowed(place_with_id));
-
-        // For copied we treat this mostly like a borrow except that we don't add the place
-        // to borrowed_temporaries because the copy is consumed.
-    }
-
-    fn mutate(
-        &mut self,
-        assignee_place: &expr_use_visitor::PlaceWithHirId<'tcx>,
-        diag_expr_id: HirId,
-    ) {
-        debug!("mutate {assignee_place:?}; diag_expr_id={diag_expr_id:?}");
-
-        if assignee_place.place.base == PlaceBase::Rvalue
-            && assignee_place.place.projections.is_empty()
-        {
-            // Assigning to an Rvalue is illegal unless done through a dereference. We would have
-            // already gotten a type error, so we will just return here.
-            return;
-        }
-
-        // If the type being assigned needs dropped, then the mutation counts as a borrow
-        // since it is essentially doing `Drop::drop(&mut x); x = new_value;`.
-        let ty = self.tcx.erase_regions(assignee_place.place.base_ty);
-        if ty.has_infer() {
-            self.tcx.sess.delay_span_bug(
-                self.tcx.hir().span(assignee_place.hir_id),
-                format!("inference variables in {ty}"),
-            );
-        } else if ty.needs_drop(self.tcx, self.param_env) {
-            self.places
-                .borrowed
-                .insert(TrackedValue::from_place_with_projections_allowed(assignee_place));
-        }
-    }
-
-    fn bind(
-        &mut self,
-        binding_place: &expr_use_visitor::PlaceWithHirId<'tcx>,
-        diag_expr_id: HirId,
-    ) {
-        debug!("bind {binding_place:?}; diag_expr_id={diag_expr_id:?}");
-    }
-
-    fn fake_read(
-        &mut self,
-        place_with_id: &expr_use_visitor::PlaceWithHirId<'tcx>,
-        cause: rustc_middle::mir::FakeReadCause,
-        diag_expr_id: HirId,
-    ) {
-        debug!(
-            "fake_read place_with_id={place_with_id:?}; cause={cause:?}; diag_expr_id={diag_expr_id:?}"
-        );
-
-        // fake reads happen in places like the scrutinee of a match expression.
-        // we treat those as a borrow, much like a copy: the idea is that we are
-        // transiently creating a `&T` ref that we can read from to observe the current
-        // value (this `&T` is immediately dropped afterwards).
-        self.borrow_place(place_with_id);
-    }
-}