bjoernager/rust
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inhibit layout randomization for Box

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The 8472 2024-08-31 14:43:23 +02:00
parent 1e377c5b9f
commit df20808f4d
3 changed files with 27 additions and 9 deletions
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10
compiler/rustc_middle/src/ty/mod.rs
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@ -35,6 +35,7 @@ use rustc_data_structures::tagged_ptr::CopyTaggedPtr;
use rustc_errors::{Diag, ErrorGuaranteed, StashKey};
use rustc_hir::def::{CtorKind, CtorOf, DefKind, DocLinkResMap, LifetimeRes, Res};
use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LocalDefId, LocalDefIdMap};
use rustc_hir::LangItem;
use rustc_index::IndexVec;
use rustc_macros::{
extension, Decodable, Encodable, HashStable, TyDecodable, TyEncodable, TypeFoldable,
@ -1570,8 +1571,15 @@ impl<'tcx> TyCtxt<'tcx> {
flags.insert(ReprFlags::RANDOMIZE_LAYOUT);
}
// box is special, on the one hand the compiler assumes an ordered layout, with the pointer
// always at offset zero. On the other hand we want scalar abi optimizations.
let is_box = self.is_lang_item(did.to_def_id(), LangItem::OwnedBox);
// This is here instead of layout because the choice must make it into metadata.
if !self.consider_optimizing(|| format!("Reorder fields of {:?}", self.def_path_str(did))) {
if is_box
|| !self
.consider_optimizing(|| format!("Reorder fields of {:?}", self.def_path_str(did)))
{
flags.insert(ReprFlags::IS_LINEAR);
}