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This commit is contained in:
Eric Holk 2021-12-06 11:08:00 -08:00
parent 46760b4e67
commit 006f547162
1 changed files with 10 additions and 1 deletions
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11
compiler/rustc_typeck/src/check/generator_interior/drop_ranges.rs
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@ -34,8 +34,15 @@ use crate::expr_use_visitor;
/// record the parent expression, which is the point where the drop actually takes place. /// record the parent expression, which is the point where the drop actually takes place.
pub struct ExprUseDelegate<'tcx> { pub struct ExprUseDelegate<'tcx> {
hir: Map<'tcx>, hir: Map<'tcx>,
/// Maps a HirId to a set of HirIds that are dropped by that node. /// Records the point at which an expression or local variable is dropped.
///
/// 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`.
consumed_places: HirIdMap<HirIdSet>, consumed_places: HirIdMap<HirIdSet>,
/// A set of hir-ids of values or variables that are borrowed at some point within the body.
borrowed_places: HirIdSet, borrowed_places: HirIdSet,
} }
@ -114,6 +121,8 @@ fn place_hir_id(place: &Place<'_>) -> Option<HirId> {
pub struct DropRangeVisitor<'tcx> { pub struct DropRangeVisitor<'tcx> {
hir: Map<'tcx>, hir: Map<'tcx>,
/// Maps a HirId to a set of HirIds that are dropped by that node. /// Maps a HirId to a set of HirIds that are dropped by that node.
///
/// See also the more detailed comment on `ExprUseDelegate.consumed_places`.
consumed_places: HirIdMap<HirIdSet>, consumed_places: HirIdMap<HirIdSet>,
borrowed_places: HirIdSet, borrowed_places: HirIdSet,
drop_ranges: DropRanges, drop_ranges: DropRanges,