Make naming more explicit.

compiler/rustc_ast_lowering/src/lib.rs

@@ -102,7 +102,9 @@ struct LoweringContext<'a, 'hir: 'a> {
 
     /// The items being lowered are collected here.
     owners: IndexVec<LocalDefId, Option<hir::OwnerInfo<'hir>>>,
+    /// Bodies inside the owner being lowered.
     bodies: IndexVec<hir::ItemLocalId, Option<&'hir hir::Body<'hir>>>,
+    /// Attributes inside the owner being lowered.
     attrs: BTreeMap<hir::ItemLocalId, &'hir [Attribute]>,
 
     generator_kind: Option<hir::GeneratorKind>,
@@ -418,6 +420,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         self.arena.alloc(krate)
     }
 
+    /// Compute the hash for the HIR of the full crate.
+    /// This hash will then be part of the crate_hash which is stored in the metadata.
     fn compute_hir_hash(&mut self) -> Fingerprint {
         let definitions = self.resolver.definitions();
         let mut hir_body_nodes: Vec<_> = self
@@ -493,10 +497,10 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             }
         }
 
-        let (hash, node_hash) = self.hash_body(node, &bodies);
+        let (hash_including_bodies, hash_without_bodies) = self.hash_owner(node, &bodies);
         let (nodes, parenting) =
             index::index_hir(self.sess, self.resolver.definitions(), node, &bodies);
-        let nodes = hir::OwnerNodes { hash, node_hash, nodes, bodies };
+        let nodes = hir::OwnerNodes { hash_including_bodies, hash_without_bodies, nodes, bodies };
         let attrs = {
             let mut hcx = self.resolver.create_stable_hashing_context();
             let mut stable_hasher = StableHasher::new();
@@ -510,7 +514,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
 
     /// Hash the HIR node twice, one deep and one shallow hash.  This allows to differentiate
     /// queries which depend on the full HIR tree and those which only depend on the item signature.
-    fn hash_body(
+    fn hash_owner(
         &mut self,
         node: hir::OwnerNode<'hir>,
         bodies: &IndexVec<hir::ItemLocalId, Option<&'hir hir::Body<'hir>>>,
@@ -520,13 +524,13 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         hcx.with_hir_bodies(true, node.def_id(), bodies, |hcx| {
             node.hash_stable(hcx, &mut stable_hasher)
         });
-        let full_hash = stable_hasher.finish();
+        let hash_including_bodies = stable_hasher.finish();
         let mut stable_hasher = StableHasher::new();
         hcx.with_hir_bodies(false, node.def_id(), bodies, |hcx| {
             node.hash_stable(hcx, &mut stable_hasher)
         });
-        let node_hash = stable_hasher.finish();
+        let hash_without_bodies = stable_hasher.finish();
-        (full_hash, node_hash)
+        (hash_including_bodies, hash_without_bodies)
     }
 
     /// This method allocates a new `HirId` for the given `NodeId` and stores it in

compiler/rustc_hir/src/hir.rs

@@ -692,9 +692,9 @@ impl<'tcx> AttributeMap<'tcx> {
 #[derive(Debug)]
 pub struct OwnerNodes<'tcx> {
     /// Pre-computed hash of the full HIR.
-    pub hash: Fingerprint,
+    pub hash_including_bodies: Fingerprint,
-    /// Pre-computed hash of the top node.
+    /// Pre-computed hash of the item signature, sithout recursing into the body.
-    pub node_hash: Fingerprint,
+    pub hash_without_bodies: Fingerprint,
     /// Full HIR for the current owner.
     // The zeroth node's parent is trash, but is never accessed.
     pub nodes: IndexVec<ItemLocalId, Option<ParentedNode<'tcx>>>,

compiler/rustc_hir/src/stable_hash_impls.rs

@@ -215,8 +215,9 @@ impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for OwnerNodes<'tcx> {
     fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
         // We ignore the `nodes` and `bodies` fields since these refer to information included in
         // `hash` which is hashed in the collector and used for the crate hash.
-        let OwnerNodes { hash, node_hash: _, nodes: _, bodies: _ } = *self;
+        let OwnerNodes { hash_including_bodies, hash_without_bodies: _, nodes: _, bodies: _ } =
-        hash.hash_stable(hcx, hasher);
+            *self;
+        hash_including_bodies.hash_stable(hcx, hasher);
     }
 }
 

compiler/rustc_middle/src/hir/mod.rs

@@ -23,14 +23,14 @@ use rustc_span::DUMMY_SP;
 #[derive(Copy, Clone, Debug)]
 pub struct Owner<'tcx> {
     node: OwnerNode<'tcx>,
-    node_hash: Fingerprint,
+    hash_without_bodies: Fingerprint,
 }
 
 impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Owner<'tcx> {
     #[inline]
     fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
-        let Owner { node: _, node_hash } = self;
+        let Owner { node: _, hash_without_bodies } = self;
-        node_hash.hash_stable(hcx, hasher)
+        hash_without_bodies.hash_stable(hcx, hasher)
     }
 }
 
@@ -67,7 +67,7 @@ pub fn provide(providers: &mut Providers) {
     providers.hir_owner = |tcx, id| {
         let owner = tcx.hir_crate(()).owners[id].as_ref()?;
         let node = owner.node();
-        Some(Owner { node, node_hash: owner.nodes.node_hash })
+        Some(Owner { node, hash_without_bodies: owner.nodes.hash_without_bodies })
     };
     providers.hir_owner_nodes = |tcx, id| tcx.hir_crate(()).owners[id].as_ref().map(|i| &i.nodes);
     providers.hir_owner_parent = |tcx, id| {