bjoernager/rust
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Use invalid local id for zeroth node parent.

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This commit is contained in:
Camille GILLOT 2021-10-12 08:34:38 +02:00
parent 6b7995195a
commit c5628a5e65
3 changed files with 11 additions and 2 deletions
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4
compiler/rustc_hir/src/hir.rs
View file

@ -696,7 +696,9 @@ pub struct OwnerNodes<'tcx> {
/// Pre-computed hash of the item signature, sithout recursing into the body.
pub hash_without_bodies: Fingerprint,
/// Full HIR for the current owner.
// The zeroth node's parent is trash, but is never accessed.
// The zeroth node's parent should never be accessed: the owner's parent is computed by the
// hir_owner_parent query. It is set to `ItemLocalId::INVALID` to force an ICE if accidentally
// used.
pub nodes: IndexVec<ItemLocalId, Option<ParentedNode<'tcx>>>,
/// Content of local bodies.
pub bodies: IndexVec<ItemLocalId, Option<&'tcx Body<'tcx>>>,

4
compiler/rustc_hir/src/hir_id.rs
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@ -56,6 +56,10 @@ rustc_index::newtype_index! {
pub struct ItemLocalId { .. }
}
rustc_data_structures::impl_stable_hash_via_hash!(ItemLocalId);
impl ItemLocalId {
/// Signal local id which should never be used.
pub const INVALID: ItemLocalId = ItemLocalId::MAX;
}
/// The `HirId` corresponding to `CRATE_NODE_ID` and `CRATE_DEF_INDEX`.
pub const CRATE_HIR_ID: HirId = HirId {