bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Reject registration of downcasts for now

Browse source
This commit is contained in:
Jannis Christopher Köhl 2022-09-01 15:05:53 +02:00
parent 47a00d5337
commit 8a789ce009
3 changed files with 92 additions and 87 deletions
Download patch file Download diff file Expand all files Collapse all files

9
compiler/rustc_mir_dataflow/src/value_analysis.rs
View file

@ -462,8 +462,8 @@ impl Map {
filter: &mut impl FnMut(Ty<'tcx>) -> bool,
) {
if filter(ty) {
self.register(local, projection)
.expect("projection should only contain convertible elements");
// Since downcasts are currently not allowed, this might fail.
let _ = self.register(local, projection);
}
if max_derefs > 0 {
if let Some(ty::TypeAndMut { ty, .. }) = ty.builtin_deref(false) {
@ -496,6 +496,11 @@ impl Map {
// Apply the projection.
for &elem in projection {
// For now, downcast is not allowed (see #101168).
match elem {
PlaceElem::Downcast(..) => return Err(()),
_ => (),
}
let elem = elem.try_into()?;
index = *self.projections.entry((index, elem)).or_insert_with(|| {
// Prepend new child to the linked list.