bjoernager/rust
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add helper methods for accessing struct tail

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This commit is contained in:
Lukas Markeffsky 2023-07-05 20:44:24 +02:00
parent e3de14e463
commit 7aa5f39d3b
9 changed files with 31 additions and 34 deletions
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11
compiler/rustc_ty_utils/src/layout.rs
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@ -480,7 +480,7 @@ fn layout_of_uncached<'tcx>(
.any(|(i, v)| v.discr != ty::VariantDiscr::Relative(i.as_u32()));
let maybe_unsized = def.is_struct()
&& def.non_enum_variant().fields.raw.last().is_some_and(|last_field| {
&& def.non_enum_variant().tail_opt().is_some_and(|last_field| {
let param_env = tcx.param_env(def.did());
!tcx.type_of(last_field.did).subst_identity().is_sized(tcx, param_env)
});
@ -502,14 +502,7 @@ fn layout_of_uncached<'tcx>(
// If the struct tail is sized and can be unsized, check that unsizing doesn't move the fields around.
if cfg!(debug_assertions)
&& maybe_unsized
&& def
.non_enum_variant()
.fields
.raw
.last()
.unwrap()
.ty(tcx, substs)
.is_sized(tcx, cx.param_env)
&& def.non_enum_variant().tail().ty(tcx, substs).is_sized(tcx, cx.param_env)
{
let mut variants = variants;
let tail_replacement = cx.layout_of(Ty::new_slice(tcx, tcx.types.u8)).unwrap();

2
compiler/rustc_ty_utils/src/ty.rs
View file

@ -103,7 +103,7 @@ fn adt_sized_constraint(tcx: TyCtxt<'_>, def_id: DefId) -> &[Ty<'_>] {
let result = tcx.mk_type_list_from_iter(
def.variants()
.iter()
.filter_map(|v| v.fields.raw.last())
.filter_map(|v| v.tail_opt())
.flat_map(|f| sized_constraint_for_ty(tcx, def, tcx.type_of(f.did).subst_identity())),
);