Detect (non-raw) borrows of null ZST pointers in CheckNull

compiler/rustc_mir_transform/src/check_pointers.rs

@@ -40,10 +40,10 @@ pub(crate) enum BorrowCheckMode {
 ///   success and fail the check otherwise.
 /// This utility will insert a terminator block that asserts on the condition
 /// and panics on failure.
-pub(crate) fn check_pointers<'a, 'tcx, F>(
+pub(crate) fn check_pointers<'tcx, F>(
     tcx: TyCtxt<'tcx>,
     body: &mut Body<'tcx>,
-    excluded_pointees: &'a [Ty<'tcx>],
+    excluded_pointees: &[Ty<'tcx>],
     on_finding: F,
     borrow_check_mode: BorrowCheckMode,
 ) where
@@ -51,6 +51,7 @@ pub(crate) fn check_pointers<'a, 'tcx, F>(
         /* tcx: */ TyCtxt<'tcx>,
         /* pointer: */ Place<'tcx>,
         /* pointee_ty: */ Ty<'tcx>,
+        /* context: */ PlaceContext,
         /* local_decls: */ &mut IndexVec<Local, LocalDecl<'tcx>>,
         /* stmts: */ &mut Vec<Statement<'tcx>>,
         /* source_info: */ SourceInfo,
@@ -86,7 +87,7 @@ pub(crate) fn check_pointers<'a, 'tcx, F>(
             );
             finder.visit_statement(statement, location);
 
-            for (local, ty) in finder.into_found_pointers() {
+            for (local, ty, context) in finder.into_found_pointers() {
                 debug!("Inserting check for {:?}", ty);
                 let new_block = split_block(basic_blocks, location);
 
@@ -98,6 +99,7 @@ pub(crate) fn check_pointers<'a, 'tcx, F>(
                     tcx,
                     local,
                     ty,
+                    context,
                     local_decls,
                     &mut block_data.statements,
                     source_info,
@@ -125,7 +127,7 @@ struct PointerFinder<'a, 'tcx> {
     tcx: TyCtxt<'tcx>,
     local_decls: &'a mut LocalDecls<'tcx>,
     typing_env: ty::TypingEnv<'tcx>,
-    pointers: Vec<(Place<'tcx>, Ty<'tcx>)>,
+    pointers: Vec<(Place<'tcx>, Ty<'tcx>, PlaceContext)>,
     excluded_pointees: &'a [Ty<'tcx>],
     borrow_check_mode: BorrowCheckMode,
 }
@@ -148,7 +150,7 @@ impl<'a, 'tcx> PointerFinder<'a, 'tcx> {
         }
     }
 
-    fn into_found_pointers(self) -> Vec<(Place<'tcx>, Ty<'tcx>)> {
+    fn into_found_pointers(self) -> Vec<(Place<'tcx>, Ty<'tcx>, PlaceContext)> {
         self.pointers
     }
 
@@ -211,7 +213,7 @@ impl<'a, 'tcx> Visitor<'tcx> for PointerFinder<'a, 'tcx> {
             return;
         }
 
-        self.pointers.push((pointer, pointee_ty));
+        self.pointers.push((pointer, pointee_ty, context));
 
         self.super_place(place, context, location);
     }