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rustc_middle: Document which exactly DefIds don't have DefKinds #109778

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Apr 11, 2023
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rustc_middle: Document which exactly DefIds don't have DefKinds #109778

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21 changes: 18 additions & 3 deletions compiler/rustc_middle/src/hir/map/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ use rustc_data_structures::svh::Svh;
use rustc_data_structures::sync::{par_for_each_in, Send, Sync};
use rustc_hir::def::{DefKind, Res};
use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_ID, LOCAL_CRATE};
use rustc_hir::definitions::{DefKey, DefPath, DefPathHash};
use rustc_hir::definitions::{DefKey, DefPath, DefPathData, DefPathHash};
use rustc_hir::intravisit::{self, Visitor};
use rustc_hir::*;
use rustc_index::vec::Idx;
Expand Down Expand Up @@ -180,7 +180,19 @@ impl<'hir> Map<'hir> {
/// Do not call this function directly. The query should be called.
pub(super) fn opt_def_kind(self, local_def_id: LocalDefId) -> Option<DefKind> {
let hir_id = self.local_def_id_to_hir_id(local_def_id);
let def_kind = match self.find(hir_id)? {
let node = match self.find(hir_id) {
Some(node) => node,
None => match self.def_key(local_def_id).disambiguated_data.data {
// FIXME: Some anonymous constants do not have corresponding HIR nodes,
// so many local queries will panic on their def ids. `None` is currently
// returned here instead of `DefKind::{Anon,Inline}Const` to avoid such panics.
// Ideally all def ids should have `DefKind`s, we need to create the missing
// HIR nodes or feed relevant query results to achieve that.
DefPathData::AnonConst => return None,
_ => bug!("no HIR node for def id {local_def_id:?}"),
},
};
let def_kind = match node {
Node::Item(item) => match item.kind {
ItemKind::Static(_, mt, _) => DefKind::Static(mt),
ItemKind::Const(..) => DefKind::Const,
Expand Down Expand Up @@ -267,7 +279,10 @@ impl<'hir> Map<'hir> {
| Node::Param(_)
| Node::Arm(_)
| Node::Lifetime(_)
| Node::Block(_) => return None,
| Node::Block(_) => span_bug!(
self.span(hir_id),
"unexpected node with def id {local_def_id:?}: {node:?}"
),
};
Some(def_kind)
}
Expand Down