Parametrize gather_moves by filter.

Author: cjgillot

compiler/rustc_borrowck/src/lib.rs

@@ -33,7 +33,7 @@ use rustc_middle::mir::tcx::PlaceTy;
 use rustc_middle::mir::*;
 use rustc_middle::query::Providers;
 use rustc_middle::traits::DefiningAnchor;
-use rustc_middle::ty::{self, CapturedPlace, ParamEnv, RegionVid, TyCtxt};
+use rustc_middle::ty::{self, Ty, CapturedPlace, ParamEnv, RegionVid, TyCtxt};
 use rustc_session::lint::builtin::UNUSED_MUT;
 use rustc_span::{Span, Symbol};
 use rustc_target::abi::FieldIdx;
@@ -48,7 +48,7 @@ use rustc_mir_dataflow::impls::{
     EverInitializedPlaces, MaybeInitializedPlaces, MaybeUninitializedPlaces,
 };
 use rustc_mir_dataflow::move_paths::{InitIndex, MoveOutIndex, MovePathIndex};
-use rustc_mir_dataflow::move_paths::{InitLocation, LookupResult, MoveData};
+use rustc_mir_dataflow::move_paths::{InitLocation, LookupResult, MoveData, PathFilter};
 use rustc_mir_dataflow::Analysis;
 use rustc_mir_dataflow::MoveDataParamEnv;
 
@@ -215,10 +215,42 @@ fn do_mir_borrowck<'tcx>(
     let location_table_owned = LocationTable::new(body);
     let location_table = &location_table_owned;
 
-    let move_data = MoveData::gather_moves(&body, tcx, param_env);
+    let move_path_filter = |ty: Ty<'tcx>| match ty.kind() {
+        ty::Ref(..) | ty::RawPtr(..) | ty::Slice(_) => PathFilter::Leaf,
+        ty::Adt(adt, _) => {
+            if adt.has_dtor(tcx) && !adt.is_box() {
+                PathFilter::Leaf
+            } else {
+                PathFilter::Create
+            }
+        }
+        ty::Bool
+        | ty::Char
+        | ty::Int(_)
+        | ty::Uint(_)
+        | ty::Float(_)
+        | ty::Foreign(_)
+        | ty::Str
+        | ty::Array(_, _)
+        | ty::FnDef(_, _)
+        | ty::FnPtr(_)
+        | ty::Dynamic(_, _, _)
+        | ty::Closure(_, _)
+        | ty::Generator(_, _, _)
+        | ty::GeneratorWitness(..)
+        | ty::Never
+        | ty::Tuple(_)
+        | ty::Alias(_, _)
+        | ty::Param(_)
+        | ty::Bound(_, _)
+        | ty::Infer(_)
+        | ty::Error(_)
+        | ty::Placeholder(_) => PathFilter::Create,
+    };
+    let move_data = MoveData::gather_moves(&body, tcx, param_env, move_path_filter);
     let promoted_move_data = promoted
         .iter_enumerated()
-        .map(|(idx, body)| (idx, MoveData::gather_moves(&body, tcx, param_env)));
+        .map(|(idx, body)| (idx, MoveData::gather_moves(&body, tcx, param_env, move_path_filter)));
 
     let mdpe = MoveDataParamEnv { move_data, param_env };