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Avoid ICEing miri on layout query cycles

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This commit is contained in:
Oli Scherer 2023-05-02 16:14:20 +00:00
parent 7b99493492
commit 7bc6d598f9
6 changed files with 119 additions and 44 deletions
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5
compiler/rustc_middle/src/ty/layout.rs
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@ -210,6 +210,7 @@ pub enum LayoutError<'tcx> {
Unknown(Ty<'tcx>),
SizeOverflow(Ty<'tcx>),
NormalizationFailure(Ty<'tcx>, NormalizationError<'tcx>),
Cycle,
}
impl IntoDiagnostic<'_, !> for LayoutError<'_> {
@ -230,6 +231,9 @@ impl IntoDiagnostic<'_, !> for LayoutError<'_> {
diag.set_arg("failure_ty", e.get_type_for_failure());
diag.set_primary_message(fluent::middle_cannot_be_normalized);
}
LayoutError::Cycle => {
diag.set_primary_message(fluent::middle_cycle);
}
}
diag
}
@ -250,6 +254,7 @@ impl<'tcx> fmt::Display for LayoutError<'tcx> {
t,
e.get_type_for_failure()
),
LayoutError::Cycle => write!(f, "a cycle occurred during layout computation"),
}
}
}

6
compiler/rustc_middle/src/values.rs
View file

@ -106,6 +106,12 @@ impl<'tcx> Value<TyCtxt<'tcx>, DepKind> for ty::EarlyBinder<ty::Binder<'_, ty::F
}
}
impl<'tcx, T> Value<TyCtxt<'tcx>, DepKind> for Result<T, ty::layout::LayoutError<'_>> {
fn from_cycle_error(_tcx: TyCtxt<'tcx>, _cycle: &[QueryInfo<DepKind>]) -> Self {
Err(ty::layout::LayoutError::Cycle)
}
}
// item_and_field_ids should form a cycle where each field contains the
// type in the next element in the list
pub fn recursive_type_error(