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Don't ICE on mutable zst slices

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This commit is contained in:
Oliver Scherer 2019-06-24 15:31:52 +02:00
parent 354163d478
commit 6b26fdad0a
1 changed files with 13 additions and 7 deletions
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20
src/librustc_mir/interpret/intern.rs
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@ -147,13 +147,13 @@ for
// Handle trait object vtables
if let Ok(meta) = value.to_meta() {
if let ty::Dynamic(..) = self.ecx.tcx.struct_tail(referenced_ty).sty {
if let Ok(vtable) = meta.unwrap().to_ptr() {
// explitly choose `Immutable` here, since vtables are immutable, even
// if the reference of the fat pointer is mutable
self.intern_shallow(vtable, Mutability::Immutable)?;
}
if let Ok(vtable) = meta.unwrap().to_ptr() {
// explitly choose `Immutable` here, since vtables are immutable, even
// if the reference of the fat pointer is mutable
self.intern_shallow(vtable, Mutability::Immutable)?;
}
}
}
let mplace = self.ecx.ref_to_mplace(value)?;
// Check if we have encountered this pointer+layout combination before.
// Only recurse for allocation-backed pointers.
@ -174,8 +174,14 @@ for
(InternMode::Static, hir::Mutability::MutMutable) => {},
// we statically prevent `&mut T` via `const_qualif` and double check this here
(InternMode::ConstBase, hir::Mutability::MutMutable) |
(InternMode::Const, hir::Mutability::MutMutable) =>
bug!("const qualif failed to prevent mutable references"),
(InternMode::Const, hir::Mutability::MutMutable) => {
match referenced_ty.sty {
ty::Array(_, n) if n.unwrap_usize(self.ecx.tcx.tcx) == 0 => {}
ty::Slice(_)
if value.to_meta().unwrap().unwrap().to_usize(self.ecx)? == 0 => {}
_ => bug!("const qualif failed to prevent mutable references"),
}
},
}
// Compute the mutability with which we'll start visiting the allocation. This is
// what gets changed when we encounter an `UnsafeCell`