Rename RequiresStorage to MaybeRequiresStorage

...to be consistent with the naming of other dataflow analyses.

src/librustc_mir/dataflow/impls/storage_liveness.rs

@@ -71,24 +71,24 @@ type BorrowedLocalsResults<'a, 'tcx> = ResultsRefCursor<'a, 'a, 'tcx, MaybeBorro
 
 /// Dataflow analysis that determines whether each local requires storage at a
 /// given location; i.e. whether its storage can go away without being observed.
-pub struct RequiresStorage<'mir, 'tcx> {
+pub struct MaybeRequiresStorage<'mir, 'tcx> {
     body: ReadOnlyBodyAndCache<'mir, 'tcx>,
     borrowed_locals: RefCell<BorrowedLocalsResults<'mir, 'tcx>>,
 }
 
-impl<'mir, 'tcx> RequiresStorage<'mir, 'tcx> {
+impl<'mir, 'tcx> MaybeRequiresStorage<'mir, 'tcx> {
     pub fn new(
         body: ReadOnlyBodyAndCache<'mir, 'tcx>,
         borrowed_locals: &'mir Results<'tcx, MaybeBorrowedLocals>,
     ) -> Self {
-        RequiresStorage {
+        MaybeRequiresStorage {
             body,
             borrowed_locals: RefCell::new(ResultsRefCursor::new(*body, borrowed_locals)),
         }
     }
 }
 
-impl<'mir, 'tcx> dataflow::AnalysisDomain<'tcx> for RequiresStorage<'mir, 'tcx> {
+impl<'mir, 'tcx> dataflow::AnalysisDomain<'tcx> for MaybeRequiresStorage<'mir, 'tcx> {
     type Idx = Local;
 
     const NAME: &'static str = "requires_storage";
@@ -106,7 +106,7 @@ impl<'mir, 'tcx> dataflow::AnalysisDomain<'tcx> for RequiresStorage<'mir, 'tcx>
     }
 }
 
-impl<'mir, 'tcx> dataflow::GenKillAnalysis<'tcx> for RequiresStorage<'mir, 'tcx> {
+impl<'mir, 'tcx> dataflow::GenKillAnalysis<'tcx> for MaybeRequiresStorage<'mir, 'tcx> {
     fn before_statement_effect(
         &self,
         trans: &mut impl GenKill<Self::Idx>,
@@ -232,7 +232,7 @@ impl<'mir, 'tcx> dataflow::GenKillAnalysis<'tcx> for RequiresStorage<'mir, 'tcx>
     }
 }
 
-impl<'mir, 'tcx> RequiresStorage<'mir, 'tcx> {
+impl<'mir, 'tcx> MaybeRequiresStorage<'mir, 'tcx> {
     /// Kill locals that are fully moved and have not been borrowed.
     fn check_for_move(&self, trans: &mut impl GenKill<Local>, loc: Location) {
         let mut visitor = MoveVisitor { trans, borrowed_locals: &self.borrowed_locals };
@@ -240,7 +240,7 @@ impl<'mir, 'tcx> RequiresStorage<'mir, 'tcx> {
     }
 }
 
-impl<'mir, 'tcx> BottomValue for RequiresStorage<'mir, 'tcx> {
+impl<'mir, 'tcx> BottomValue for MaybeRequiresStorage<'mir, 'tcx> {
     /// bottom = dead
     const BOTTOM_VALUE: bool = false;
 }

src/librustc_mir/dataflow/mod.rs

@@ -25,7 +25,7 @@ pub use self::impls::DefinitelyInitializedPlaces;
 pub use self::impls::EverInitializedPlaces;
 pub use self::impls::{MaybeBorrowedLocals, MaybeMutBorrowedLocals};
 pub use self::impls::{MaybeInitializedPlaces, MaybeUninitializedPlaces};
-pub use self::impls::{MaybeStorageLive, RequiresStorage};
+pub use self::impls::{MaybeRequiresStorage, MaybeStorageLive};
 
 use self::move_paths::MoveData;
 

src/librustc_mir/transform/generator.rs

@@ -50,7 +50,7 @@
 //! Otherwise it drops all the values in scope at the last suspension point.
 
 use crate::dataflow::generic::{self as dataflow, Analysis};
-use crate::dataflow::{MaybeBorrowedLocals, MaybeStorageLive, RequiresStorage};
+use crate::dataflow::{MaybeBorrowedLocals, MaybeRequiresStorage, MaybeStorageLive};
 use crate::transform::no_landing_pads::no_landing_pads;
 use crate::transform::simplify;
 use crate::transform::{MirPass, MirSource};
@@ -490,7 +490,7 @@ fn locals_live_across_suspend_points(
 
     // Calculate the MIR locals that we actually need to keep storage around
     // for.
-    let requires_storage_results = RequiresStorage::new(body, &borrowed_locals_results)
+    let requires_storage_results = MaybeRequiresStorage::new(body, &borrowed_locals_results)
         .into_engine(tcx, body_ref, def_id)
         .iterate_to_fixpoint();
     let mut requires_storage_cursor =
@@ -600,7 +600,7 @@ fn compute_storage_conflicts(
     body: &'mir Body<'tcx>,
     stored_locals: &liveness::LiveVarSet,
     ignored: &StorageIgnored,
-    requires_storage: dataflow::Results<'tcx, RequiresStorage<'mir, 'tcx>>,
+    requires_storage: dataflow::Results<'tcx, MaybeRequiresStorage<'mir, 'tcx>>,
 ) -> BitMatrix<GeneratorSavedLocal, GeneratorSavedLocal> {
     assert_eq!(body.local_decls.len(), ignored.0.domain_size());
     assert_eq!(body.local_decls.len(), stored_locals.domain_size());