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some comments or dynamic drop handling

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This commit is contained in:
Ralf Jung 2024-05-04 20:04:01 +02:00
parent 86a933a574
commit f0dee6bbe5
2 changed files with 8 additions and 2 deletions
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4
compiler/rustc_codegen_ssa/src/mir/block.rs
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@ -540,7 +540,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
// \-------/
//
let virtual_drop = Instance {
def: ty::InstanceDef::Virtual(drop_fn.def_id(), 0),
def: ty::InstanceDef::Virtual(drop_fn.def_id(), 0), // idx 0: the drop function
args: drop_fn.args,
};
debug!("ty = {:?}", ty);
@ -581,7 +581,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
//
// SO THEN WE CAN USE THE ABOVE CODE.
let virtual_drop = Instance {
def: ty::InstanceDef::Virtual(drop_fn.def_id(), 0),
def: ty::InstanceDef::Virtual(drop_fn.def_id(), 0), // idx 0: the drop function
args: drop_fn.args,
};
debug!("ty = {:?}", ty);

6
compiler/rustc_const_eval/src/interpret/terminator.rs
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@ -949,6 +949,12 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
// implementation fail -- a problem shared by rustc.
let place = self.force_allocation(place)?;
// We behave a bit different from codegen here.
// Codegen creates an `InstanceDef::Virtual` with index 0 (the slot of the drop method) and
// then dispatches that to the normal call machinery. However, our call machinery currently
// only supports calling `VtblEntry::Method`; it would choke on a `MetadataDropInPlace`. So
// instead we do the virtual call stuff ourselves. It's easier here than in `eval_fn_call`
// since we can just get a place of the underlying type and use `mplace_to_ref`.
let place = match place.layout.ty.kind() {
ty::Dynamic(data, _, ty::Dyn) => {
// Dropping a trait object. Need to find actual drop fn.