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Miri: make size/align_of_val work for dangling raw ptrs

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This commit is contained in:
Ralf Jung 2020-12-29 22:46:17 +01:00
parent 158f8d034b
commit 95aed7ab3b
2 changed files with 5 additions and 3 deletions
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6
compiler/rustc_mir/src/interpret/intrinsics.rs
View File

@ -141,9 +141,11 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
}
sym::min_align_of_val | sym::size_of_val => {
let place = self.deref_operand(args[0])?;
// Avoid `deref_operand` -- this is not a deref, the ptr does not have to be
// dereferencable!
let place = self.ref_to_mplace(self.read_immediate(args[0])?)?;
let (size, align) = self
.size_and_align_of(place.meta, place.layout)?
.size_and_align_of_mplace(place)?
.ok_or_else(|| err_unsup_format!("`extern type` does not have known layout"))?;
let result = match intrinsic_name {

2
compiler/rustc_mir/src/interpret/validity.rs
View File

@ -391,7 +391,7 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, '
}
// Make sure this is dereferenceable and all.
let size_and_align = try_validation!(
self.ecx.size_and_align_of(place.meta, place.layout),
self.ecx.size_and_align_of_mplace(place),
self.path,
err_ub!(InvalidMeta(msg)) => { "invalid {} metadata: {}", kind, msg },
);