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Implement has_ptr_meta without computing type layout

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This matches type_has_metadata in cg_ssa and doesn't require computing
the layout of the type. It is also a bit faster.
This commit is contained in:
bjorn3 2023-12-18 15:24:06 +00:00
parent 697aa0a320
commit c4567c1841
1 changed files with 9 additions and 5 deletions
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14
src/common.rs
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@ -98,11 +98,15 @@ fn clif_pair_type_from_ty<'tcx>(
/// Is a pointer to this type a fat ptr? /// Is a pointer to this type a fat ptr?
pub(crate) fn has_ptr_meta<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> bool { pub(crate) fn has_ptr_meta<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> bool {
let ptr_ty = Ty::new_ptr(tcx, TypeAndMut { ty, mutbl: rustc_hir::Mutability::Not }); if ty.is_sized(tcx, ParamEnv::reveal_all()) {
match &tcx.layout_of(ParamEnv::reveal_all().and(ptr_ty)).unwrap().abi { return false;
Abi::Scalar(_) => false, }
Abi::ScalarPair(_, _) => true,
abi => unreachable!("Abi of ptr to {:?} is {:?}???", ty, abi), let tail = tcx.struct_tail_erasing_lifetimes(ty, ParamEnv::reveal_all());
match tail.kind() {
ty::Foreign(..) => false,
ty::Str | ty::Slice(..) | ty::Dynamic(..) => true,
_ => bug!("unexpected unsized tail: {:?}", tail),
} }
} }