Remove support for dyn*

5 files changed, 14 insertions, 149 deletions

diff --git a/compiler/rustc_codegen_cranelift/src/abi/mod.rs b/compiler/rustc_codegen_cranelift/src/abi/mod.rs
index 4c6fd907815..8965e4a944d 100644
--- a/compiler/rustc_codegen_cranelift/src/abi/mod.rs
+++ b/compiler/rustc_codegen_cranelift/src/abi/mod.rs
@@ -753,51 +753,6 @@ pub(crate) fn codegen_drop<'tcx>(
                 fx.bcx.ins().call_indirect(sig, drop_fn, &[ptr]);
                 fx.bcx.ins().jump(ret_block, &[]);
             }
-            ty::Dynamic(_, _, ty::DynStar) => {
-                // IN THIS ARM, WE HAVE:
-                // ty = *mut (dyn* Trait)
-                // which is: *mut exists<T: sizeof(T) == sizeof(usize)> (T, Vtable<T: Trait>)
-                //
-                // args = [ * ]
-                //          |
-                //          v
-                //      ( Data, Vtable )
-                //                |
-                //                v
-                //              /-------\
-                //              | ...   |
-                //              \-------/
-                //
-                //
-                // WE CAN CONVERT THIS INTO THE ABOVE LOGIC BY DOING
-                //
-                // data = &(*args[0]).0    // gives a pointer to Data above (really the same pointer)
-                // vtable = (*args[0]).1   // loads the vtable out
-                // (data, vtable)          // an equivalent Rust `*mut dyn Trait`
-                //
-                // SO THEN WE CAN USE THE ABOVE CODE.
-                let (data, vtable) = drop_place.to_cvalue(fx).dyn_star_force_data_on_stack(fx);
-                let drop_fn = crate::vtable::drop_fn_of_obj(fx, vtable);
-
-                let is_null = fx.bcx.ins().icmp_imm(IntCC::Equal, drop_fn, 0);
-                let target_block = fx.get_block(target);
-                let continued = fx.bcx.create_block();
-                fx.bcx.ins().brif(is_null, target_block, &[], continued, &[]);
-                fx.bcx.switch_to_block(continued);
-
-                let virtual_drop = Instance {
-                    def: ty::InstanceKind::Virtual(drop_instance.def_id(), 0),
-                    args: drop_instance.args,
-                };
-                let fn_abi = FullyMonomorphizedLayoutCx(fx.tcx)
-                    .fn_abi_of_instance(virtual_drop, ty::List::empty());
-
-                let sig = clif_sig_from_fn_abi(fx.tcx, fx.target_config.default_call_conv, &fn_abi);
-                let sig = fx.bcx.import_signature(sig);
-                fx.bcx.ins().call_indirect(sig, drop_fn, &[data]);
-                // FIXME implement cleanup on exceptions
-                fx.bcx.ins().jump(ret_block, &[]);
-            }
             _ => {
                 assert!(!matches!(drop_instance.def, InstanceKind::Virtual(_, _)));
 
diff --git a/compiler/rustc_codegen_cranelift/src/base.rs b/compiler/rustc_codegen_cranelift/src/base.rs
index 1b68c6535da..bc0a0f034b2 100644
--- a/compiler/rustc_codegen_cranelift/src/base.rs
+++ b/compiler/rustc_codegen_cranelift/src/base.rs
@@ -790,14 +790,6 @@ fn codegen_stmt<'tcx>(fx: &mut FunctionCx<'_, '_, 'tcx>, cur_block: Block, stmt:
                     let operand = codegen_operand(fx, operand);
                     crate::unsize::coerce_unsized_into(fx, operand, lval);
                 }
-                Rvalue::Cast(
-                    CastKind::PointerCoercion(PointerCoercion::DynStar, _),
-                    ref operand,
-                    _,
-                ) => {
-                    let operand = codegen_operand(fx, operand);
-                    crate::unsize::coerce_dyn_star(fx, operand, lval);
-                }
                 Rvalue::Cast(CastKind::Transmute, ref operand, _to_ty) => {
                     let operand = codegen_operand(fx, operand);
                     lval.write_cvalue_transmute(fx, operand);
diff --git a/compiler/rustc_codegen_cranelift/src/unsize.rs b/compiler/rustc_codegen_cranelift/src/unsize.rs
index df60b05c463..2aee0b2e974 100644
--- a/compiler/rustc_codegen_cranelift/src/unsize.rs
+++ b/compiler/rustc_codegen_cranelift/src/unsize.rs
@@ -112,21 +112,6 @@ fn unsize_ptr<'tcx>(
     }
 }
 
-/// Coerces `src` to `dst_ty` which is guaranteed to be a `dyn*` type.
-pub(crate) fn cast_to_dyn_star<'tcx>(
-    fx: &mut FunctionCx<'_, '_, 'tcx>,
-    src: Value,
-    src_ty_and_layout: TyAndLayout<'tcx>,
-    dst_ty: Ty<'tcx>,
-    old_info: Option<Value>,
-) -> (Value, Value) {
-    assert!(
-        matches!(dst_ty.kind(), ty::Dynamic(_, _, ty::DynStar)),
-        "destination type must be a dyn*"
-    );
-    (src, unsized_info(fx, src_ty_and_layout.ty, dst_ty, old_info))
-}
-
 /// Coerce `src`, which is a reference to a value of type `src_ty`,
 /// to a value of type `dst_ty` and store the result in `dst`
 pub(crate) fn coerce_unsized_into<'tcx>(
@@ -174,24 +159,6 @@ pub(crate) fn coerce_unsized_into<'tcx>(
     }
 }
 
-pub(crate) fn coerce_dyn_star<'tcx>(
-    fx: &mut FunctionCx<'_, '_, 'tcx>,
-    src: CValue<'tcx>,
-    dst: CPlace<'tcx>,
-) {
-    let (data, extra) = if let ty::Dynamic(_, _, ty::DynStar) = src.layout().ty.kind() {
-        let (data, vtable) = src.load_scalar_pair(fx);
-        (data, Some(vtable))
-    } else {
-        let data = src.load_scalar(fx);
-        (data, None)
-    };
-
-    let (data, vtable) = cast_to_dyn_star(fx, data, src.layout(), dst.layout().ty, extra);
-
-    dst.write_cvalue(fx, CValue::by_val_pair(data, vtable, dst.layout()));
-}
-
 // Adapted from https://github.com/rust-lang/rust/blob/2a663555ddf36f6b041445894a8c175cd1bc718c/src/librustc_codegen_ssa/glue.rs
 
 pub(crate) fn size_and_align_of<'tcx>(
diff --git a/compiler/rustc_codegen_cranelift/src/value_and_place.rs b/compiler/rustc_codegen_cranelift/src/value_and_place.rs
index cbfb215a892..9d73f200afe 100644
--- a/compiler/rustc_codegen_cranelift/src/value_and_place.rs
+++ b/compiler/rustc_codegen_cranelift/src/value_and_place.rs
@@ -121,43 +121,6 @@ impl<'tcx> CValue<'tcx> {
         }
     }
 
-    // FIXME remove
-    /// Forces the data value of a dyn* value to the stack and returns a pointer to it as well as the
-    /// vtable pointer.
-    pub(crate) fn dyn_star_force_data_on_stack(
-        self,
-        fx: &mut FunctionCx<'_, '_, 'tcx>,
-    ) -> (Value, Value) {
-        assert!(self.1.ty.is_dyn_star());
-
-        match self.0 {
-            CValueInner::ByRef(ptr, None) => {
-                let (a_scalar, b_scalar) = match self.1.backend_repr {
-                    BackendRepr::ScalarPair(a, b) => (a, b),
-                    _ => unreachable!("dyn_star_force_data_on_stack({:?})", self),
-                };
-                let b_offset = scalar_pair_calculate_b_offset(fx.tcx, a_scalar, b_scalar);
-                let clif_ty2 = scalar_to_clif_type(fx.tcx, b_scalar);
-                let mut flags = MemFlags::new();
-                flags.set_notrap();
-                let vtable = ptr.offset(fx, b_offset).load(fx, clif_ty2, flags);
-                (ptr.get_addr(fx), vtable)
-            }
-            CValueInner::ByValPair(data, vtable) => {
-                let data_ptr = fx.create_stack_slot(
-                    u32::try_from(fx.target_config.pointer_type().bytes()).unwrap(),
-                    u32::try_from(fx.target_config.pointer_type().bytes()).unwrap(),
-                );
-                data_ptr.store(fx, data, MemFlags::trusted());
-
-                (data_ptr.get_addr(fx), vtable)
-            }
-            CValueInner::ByRef(_, Some(_)) | CValueInner::ByVal(_) => {
-                unreachable!("dyn_star_force_data_on_stack({:?})", self)
-            }
-        }
-    }
-
     pub(crate) fn try_to_ptr(self) -> Option<(Pointer, Option<Value>)> {
         match self.0 {
             CValueInner::ByRef(ptr, meta) => Some((ptr, meta)),
diff --git a/compiler/rustc_codegen_cranelift/src/vtable.rs b/compiler/rustc_codegen_cranelift/src/vtable.rs
index 1fae56949bc..423cc8d225b 100644
--- a/compiler/rustc_codegen_cranelift/src/vtable.rs
+++ b/compiler/rustc_codegen_cranelift/src/vtable.rs
@@ -46,34 +46,22 @@ pub(crate) fn get_ptr_and_method_ref<'tcx>(
     mut arg: CValue<'tcx>,
     idx: usize,
 ) -> (Pointer, Value) {
-    let (ptr, vtable) = 'block: {
-        if let BackendRepr::Scalar(_) = arg.layout().backend_repr {
-            while !arg.layout().ty.is_raw_ptr() && !arg.layout().ty.is_ref() {
-                let (idx, _) = arg
-                    .layout()
-                    .non_1zst_field(fx)
-                    .expect("not exactly one non-1-ZST field in a `DispatchFromDyn` type");
-                arg = arg.value_field(fx, idx);
-            }
-        }
-
-        if let ty::Ref(_, ty, _) = arg.layout().ty.kind() {
-            if ty.is_dyn_star() {
-                let inner_layout = fx.layout_of(arg.layout().ty.builtin_deref(true).unwrap());
-                let dyn_star = CPlace::for_ptr(Pointer::new(arg.load_scalar(fx)), inner_layout);
-                let ptr = dyn_star.place_field(fx, FieldIdx::ZERO).to_ptr();
-                let vtable = dyn_star.place_field(fx, FieldIdx::ONE).to_cvalue(fx).load_scalar(fx);
-                break 'block (ptr, vtable);
-            }
+    if let BackendRepr::Scalar(_) = arg.layout().backend_repr {
+        while !arg.layout().ty.is_raw_ptr() && !arg.layout().ty.is_ref() {
+            let (idx, _) = arg
+                .layout()
+                .non_1zst_field(fx)
+                .expect("not exactly one non-1-ZST field in a `DispatchFromDyn` type");
+            arg = arg.value_field(fx, idx);
         }
+    }
 
-        if let BackendRepr::ScalarPair(_, _) = arg.layout().backend_repr {
-            let (ptr, vtable) = arg.load_scalar_pair(fx);
-            (Pointer::new(ptr), vtable)
-        } else {
-            let (ptr, vtable) = arg.try_to_ptr().unwrap();
-            (ptr, vtable.unwrap())
-        }
+    let (ptr, vtable) = if let BackendRepr::ScalarPair(_, _) = arg.layout().backend_repr {
+        let (ptr, vtable) = arg.load_scalar_pair(fx);
+        (Pointer::new(ptr), vtable)
+    } else {
+        let (ptr, vtable) = arg.try_to_ptr().unwrap();
+        (ptr, vtable.unwrap())
     };
 
     let usize_size = fx.layout_of(fx.tcx.types.usize).size.bytes();