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mir-interpret now treats unions as non-immediate, even if they have scalar layout, allowing partially initializing them

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This commit is contained in:
Oli Scherer 2022-03-03 12:02:52 +00:00
parent d32ce37a17
commit 09b291f0b2
6 changed files with 115 additions and 47 deletions
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4
compiler/rustc_const_eval/src/const_eval/eval_queries.rs
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@ -15,7 +15,7 @@ use rustc_middle::ty::layout::LayoutOf;
use rustc_middle::ty::print::with_no_trimmed_paths;
use rustc_middle::ty::{self, subst::Subst, TyCtxt};
use rustc_span::source_map::Span;
use rustc_target::abi::Abi;
use rustc_target::abi::{self, Abi};
use std::borrow::Cow;
use std::convert::TryInto;
@ -119,7 +119,7 @@ pub(super) fn op_to_const<'tcx>(
// the usual cases of extracting e.g. a `usize`, without there being a real use case for the
// `Undef` situation.
let try_as_immediate = match op.layout.abi {
Abi::Scalar(..) => true,
Abi::Scalar(abi::Scalar::Initialized { .. }) => true,
Abi::ScalarPair(..) => match op.layout.ty.kind() {
ty::Ref(_, inner, _) => match *inner.kind() {
ty::Slice(elem) => elem == ecx.tcx.types.u8,