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This commit is contained in:
Oliver Scherer 2019-12-22 12:55:31 +01:00
parent 41d58185dd
commit 8a88ff1006
1 changed files with 4 additions and 4 deletions
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8
src/librustc_mir/interpret/intern.rs
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@ -187,15 +187,15 @@ impl<'rt, 'mir, 'tcx, M: CompileTimeMachine<'mir, 'tcx>> ValueVisitor<'mir, 'tcx
if let ty::Ref(_, referenced_ty, mutability) = ty.kind {
let value = self.ecx.read_immediate(mplace.into())?;
let mplace = self.ecx.ref_to_mplace(value)?;
// Handle trait object vtables
// Handle trait object vtables.
if let ty::Dynamic(..) =
self.ecx.tcx.struct_tail_erasing_lifetimes(referenced_ty, self.ecx.param_env).kind
{
// Validation has already errored on an invalid vtable pointer so we can safely not
// do anything if this is not a real pointer
// do anything if this is not a real pointer.
if let Scalar::Ptr(vtable) = mplace.meta.unwrap() {
// explitly choose `Immutable` here, since vtables are immutable, even
// if the reference of the fat pointer is mutable
// Explitly choose `Immutable` here, since vtables are immutable, even
// if the reference of the fat pointer is mutable.
self.intern_shallow(vtable.alloc_id, Mutability::Not, None)?;
} else {
self.ecx().tcx.sess.delay_span_bug(