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Rollup merge of #49540 - bjorn3:fix_miri_discriminant, r=oli-obk

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Fix miri Discriminant() for non-ADT

Fixes #49327
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kennytm 2018-04-04 11:07:17 +02:00 committed by GitHub
commit b5ceda86aa
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1 changed files with 19 additions and 10 deletions
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11
src/librustc_mir/interpret/eval_context.rs
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@ -743,8 +743,15 @@ impl<'a, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M
Discriminant(ref place) => {
let ty = self.place_ty(place);
let layout = self.layout_of(ty)?;
let place = self.eval_place(place)?;
let discr_val = self.read_discriminant_value(place, ty)?;
match layout.variants {
layout::Variants::Single { index } => {
assert_eq!(discr_val, index as u128);
}
layout::Variants::Tagged { .. } |
layout::Variants::NicheFilling { .. } => {
if let ty::TyAdt(adt_def, _) = ty.sty {
trace!("Read discriminant {}, valid discriminants {:?}", discr_val, adt_def.discriminants(*self.tcx).collect::<Vec<_>>());
if adt_def.discriminants(*self.tcx).all(|v| {
@ -753,12 +760,14 @@ impl<'a, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M
{
return err!(InvalidDiscriminant);
}
self.write_primval(dest, PrimVal::Bytes(discr_val), dest_ty)?;
} else {
bug!("rustc only generates Rvalue::Discriminant for enums");
}
}
}
self.write_primval(dest, PrimVal::Bytes(discr_val), dest_ty)?;
}
}
if log_enabled!(::log::Level::Trace) {
self.dump_local(dest);