53 lines
2.1 KiB
Diff
53 lines
2.1 KiB
Diff
From a72666ed56ec5f1b6d254c7020cf86143edc6dbd Mon Sep 17 00:00:00 2001
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From: Josh Stone <jistone@redhat.com>
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Date: Tue, 20 Sep 2022 13:03:43 -0700
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Subject: [PATCH] rustc_transmute: fix big-endian discriminants
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---
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compiler/rustc_transmute/src/layout/tree.rs | 22 +++++++++++++++------
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1 file changed, 16 insertions(+), 6 deletions(-)
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diff --git a/compiler/rustc_transmute/src/layout/tree.rs b/compiler/rustc_transmute/src/layout/tree.rs
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index 211c813b8001..acd4fa63d782 100644
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--- a/compiler/rustc_transmute/src/layout/tree.rs
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+++ b/compiler/rustc_transmute/src/layout/tree.rs
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@@ -404,7 +404,7 @@ fn from_repr_c_variant(
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.unwrap();
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trace!(?discr_layout, "computed discriminant layout");
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variant_layout = variant_layout.extend(discr_layout).unwrap().0;
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- tree = tree.then(Self::from_disr(discr, tcx, layout_summary.discriminant_size));
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+ tree = tree.then(Self::from_discr(discr, tcx, layout_summary.discriminant_size));
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}
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// Next come fields.
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@@ -444,11 +444,21 @@ fn from_repr_c_variant(
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Ok(tree)
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}
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- pub fn from_disr(discr: Discr<'tcx>, tcx: TyCtxt<'tcx>, size: usize) -> Self {
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- // FIXME(@jswrenn): I'm certain this is missing needed endian nuance.
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- let bytes = discr.val.to_ne_bytes();
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- let bytes = &bytes[..size];
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- Self::Seq(bytes.into_iter().copied().map(|b| Self::from_bits(b)).collect())
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+ pub fn from_discr(discr: Discr<'tcx>, tcx: TyCtxt<'tcx>, size: usize) -> Self {
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+ use rustc_target::abi::Endian;
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+
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+ let bytes: [u8; 16];
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+ let bytes = match tcx.data_layout.endian {
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+ Endian::Little => {
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+ bytes = discr.val.to_le_bytes();
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+ &bytes[..size]
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+ }
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+ Endian::Big => {
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+ bytes = discr.val.to_be_bytes();
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+ &bytes[bytes.len() - size..]
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+ }
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+ };
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+ Self::Seq(bytes.iter().map(|&b| Self::from_bits(b)).collect())
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}
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}
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--
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2.37.3
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