Add InstanceDef::VtableShim.

Author: qnighy

src/librustc/ich/impls_ty.rs

@@ -1011,6 +1011,9 @@ impl<'a, 'gcx> HashStable<StableHashingContext<'a>> for ty::InstanceDef<'gcx> {
             ty::InstanceDef::Item(def_id) => {
                 def_id.hash_stable(hcx, hasher);
             }
+            ty::InstanceDef::VtableShim(def_id) => {
+                def_id.hash_stable(hcx, hasher);
+            }
             ty::InstanceDef::Intrinsic(def_id) => {
                 def_id.hash_stable(hcx, hasher);
             }

src/librustc/ty/instance.rs

@@ -27,6 +27,9 @@ pub enum InstanceDef<'tcx> {
     Item(DefId),
     Intrinsic(DefId),
 
+    /// `<T as Trait>::method` where `method` receives unsizeable `self: Self`.
+    VtableShim(DefId),
+
     /// \<fn() as FnTrait>::call_*
     /// def-id is FnTrait::call_*
     FnPtrShim(DefId, Ty<'tcx>),
@@ -63,6 +66,7 @@ impl<'tcx> InstanceDef<'tcx> {
     pub fn def_id(&self) -> DefId {
         match *self {
             InstanceDef::Item(def_id) |
+            InstanceDef::VtableShim(def_id) |
             InstanceDef::FnPtrShim(def_id, _) |
             InstanceDef::Virtual(def_id, _) |
             InstanceDef::Intrinsic(def_id, ) |
@@ -120,6 +124,9 @@ impl<'tcx> fmt::Display for Instance<'tcx> {
         ppaux::parameterized(f, self.substs, self.def_id(), &[])?;
         match self.def {
             InstanceDef::Item(_) => Ok(()),
+            InstanceDef::VtableShim(_) => {
+                write!(f, " - shim(vtable)")
+            }
             InstanceDef::Intrinsic(_) => {
                 write!(f, " - intrinsic")
             }

src/librustc/ty/mod.rs

@@ -2759,6 +2759,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
             ty::InstanceDef::Item(did) => {
                 self.optimized_mir(did)
             }
+            ty::InstanceDef::VtableShim(..) |
             ty::InstanceDef::Intrinsic(..) |
             ty::InstanceDef::FnPtrShim(..) |
             ty::InstanceDef::Virtual(..) |

src/librustc/ty/structural_impls.rs

@@ -624,6 +624,8 @@ impl<'a, 'tcx> Lift<'tcx> for ty::InstanceDef<'a> {
         match *self {
             ty::InstanceDef::Item(def_id) =>
                 Some(ty::InstanceDef::Item(def_id)),
+            ty::InstanceDef::VtableShim(def_id) =>
+                Some(ty::InstanceDef::VtableShim(def_id)),
             ty::InstanceDef::Intrinsic(def_id) =>
                 Some(ty::InstanceDef::Intrinsic(def_id)),
             ty::InstanceDef::FnPtrShim(def_id, ref ty) =>
@@ -793,6 +795,7 @@ impl<'tcx> TypeFoldable<'tcx> for ty::instance::Instance<'tcx> {
             substs: self.substs.fold_with(folder),
             def: match self.def {
                 Item(did) => Item(did.fold_with(folder)),
+                VtableShim(did) => VtableShim(did.fold_with(folder)),
                 Intrinsic(did) => Intrinsic(did.fold_with(folder)),
                 FnPtrShim(did, ty) => FnPtrShim(
                     did.fold_with(folder),
@@ -821,7 +824,7 @@ impl<'tcx> TypeFoldable<'tcx> for ty::instance::Instance<'tcx> {
         use ty::InstanceDef::*;
         self.substs.visit_with(visitor) ||
         match self.def {
-            Item(did) | Intrinsic(did) | Virtual(did, _) => {
+            Item(did) | VtableShim(did) | Intrinsic(did) | Virtual(did, _) => {
                 did.visit_with(visitor)
             },
             FnPtrShim(did, ty) | CloneShim(did, ty) => {

src/librustc_mir/interpret/terminator.rs

@@ -256,6 +256,7 @@ impl<'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
                 self.dump_place(*dest);
                 Ok(())
             }
+            ty::InstanceDef::VtableShim(..) |
             ty::InstanceDef::ClosureOnceShim { .. } |
             ty::InstanceDef::FnPtrShim(..) |
             ty::InstanceDef::DropGlue(..) |

src/librustc_mir/monomorphize/collector.rs

@@ -705,6 +705,7 @@ fn visit_instance_use<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
                 bug!("intrinsic {:?} being reified", def_id);
             }
         }
+        ty::InstanceDef::VtableShim(..) |
         ty::InstanceDef::Virtual(..) |
         ty::InstanceDef::DropGlue(_, None) => {
             // don't need to emit shim if we are calling directly.
@@ -731,6 +732,7 @@ fn should_monomorphize_locally<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, instance:
                                          -> bool {
     let def_id = match instance.def {
         ty::InstanceDef::Item(def_id) => def_id,
+        ty::InstanceDef::VtableShim(..) |
         ty::InstanceDef::ClosureOnceShim { .. } |
         ty::InstanceDef::Virtual(..) |
         ty::InstanceDef::FnPtrShim(..) |

src/librustc_mir/monomorphize/partitioning.rs

@@ -180,6 +180,7 @@ pub trait CodegenUnitExt<'tcx> {
                         InstanceDef::Item(def_id) => {
                             tcx.hir.as_local_node_id(def_id)
                         }
+                        InstanceDef::VtableShim(..) |
                         InstanceDef::Intrinsic(..) |
                         InstanceDef::FnPtrShim(..) |
                         InstanceDef::Virtual(..) |
@@ -422,6 +423,7 @@ fn mono_item_visibility(
         InstanceDef::Item(def_id) => def_id,
 
         // These are all compiler glue and such, never exported, always hidden.
+        InstanceDef::VtableShim(..) |
         InstanceDef::FnPtrShim(..) |
         InstanceDef::Virtual(..) |
         InstanceDef::Intrinsic(..) |
@@ -756,6 +758,7 @@ fn characteristic_def_id_of_mono_item<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
         MonoItem::Fn(instance) => {
             let def_id = match instance.def {
                 ty::InstanceDef::Item(def_id) => def_id,
+                ty::InstanceDef::VtableShim(..) |
                 ty::InstanceDef::FnPtrShim(..) |
                 ty::InstanceDef::ClosureOnceShim { .. } |
                 ty::InstanceDef::Intrinsic(..) |

src/librustc_mir/shim.rs

@@ -43,6 +43,9 @@ fn make_shim<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
     let mut result = match instance {
         ty::InstanceDef::Item(..) =>
             bug!("item {:?} passed to make_shim", instance),
+        ty::InstanceDef::VtableShim(..) => {
+            unimplemented!("make_shim({:?})", instance);
+        }
         ty::InstanceDef::FnPtrShim(def_id, ty) => {
             let trait_ = tcx.trait_of_item(def_id).unwrap();
             let adjustment = match tcx.lang_items().fn_trait_kind(trait_) {