1 use rustc_data_structures::stable_hasher::{HashStable, StableHasher, ToStableHashKey};
4 BodyId, Expr, ImplItem, ImplItemId, Item, ItemId, Mod, TraitItem, TraitItemId, Ty,
7 use crate::hir_id::{HirId, ItemLocalId};
8 use rustc_span::def_id::{DefPathHash, LocalDefId};
10 /// Requirements for a `StableHashingContext` to be used in this crate.
11 /// This is a hack to allow using the `HashStable_Generic` derive macro
12 /// instead of implementing everything in librustc_middle.
13 pub trait HashStableContext:
14 rustc_ast::HashStableContext + rustc_target::HashStableContext
16 fn hash_hir_id(&mut self, _: HirId, hasher: &mut StableHasher);
17 fn hash_body_id(&mut self, _: BodyId, hasher: &mut StableHasher);
18 fn hash_reference_to_item(&mut self, _: HirId, hasher: &mut StableHasher);
19 fn hash_hir_mod(&mut self, _: &Mod<'_>, hasher: &mut StableHasher);
20 fn hash_hir_expr(&mut self, _: &Expr<'_>, hasher: &mut StableHasher);
21 fn hash_hir_ty(&mut self, _: &Ty<'_>, hasher: &mut StableHasher);
22 fn hash_hir_visibility_kind(&mut self, _: &VisibilityKind<'_>, hasher: &mut StableHasher);
23 fn hash_hir_item_like<F: FnOnce(&mut Self)>(&mut self, f: F);
24 fn local_def_path_hash(&self, def_id: LocalDefId) -> DefPathHash;
27 impl<HirCtx: crate::HashStableContext> ToStableHashKey<HirCtx> for HirId {
28 type KeyType = (DefPathHash, ItemLocalId);
31 fn to_stable_hash_key(&self, hcx: &HirCtx) -> (DefPathHash, ItemLocalId) {
32 let def_path_hash = hcx.local_def_path_hash(self.owner);
33 (def_path_hash, self.local_id)
37 impl<HirCtx: crate::HashStableContext> ToStableHashKey<HirCtx> for TraitItemId {
38 type KeyType = (DefPathHash, ItemLocalId);
41 fn to_stable_hash_key(&self, hcx: &HirCtx) -> (DefPathHash, ItemLocalId) {
42 self.hir_id.to_stable_hash_key(hcx)
46 impl<HirCtx: crate::HashStableContext> ToStableHashKey<HirCtx> for ImplItemId {
47 type KeyType = (DefPathHash, ItemLocalId);
50 fn to_stable_hash_key(&self, hcx: &HirCtx) -> (DefPathHash, ItemLocalId) {
51 self.hir_id.to_stable_hash_key(hcx)
55 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for HirId {
56 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
57 hcx.hash_hir_id(*self, hasher)
61 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for BodyId {
62 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
63 hcx.hash_body_id(*self, hasher)
67 // The following implementations of HashStable for `ItemId`, `TraitItemId`, and
68 // `ImplItemId` deserve special attention. Normally we do not hash `NodeId`s within
69 // the HIR, since they just signify a HIR nodes own path. But `ItemId` et al
70 // are used when another item in the HIR is *referenced* and we certainly
71 // want to pick up on a reference changing its target, so we hash the NodeIds
74 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for ItemId {
75 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
76 hcx.hash_reference_to_item(self.id, hasher)
80 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for ImplItemId {
81 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
82 hcx.hash_reference_to_item(self.hir_id, hasher)
86 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for TraitItemId {
87 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
88 hcx.hash_reference_to_item(self.hir_id, hasher)
92 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Mod<'_> {
93 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
94 hcx.hash_hir_mod(self, hasher)
98 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Expr<'_> {
99 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
100 hcx.hash_hir_expr(self, hasher)
104 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Ty<'_> {
105 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
106 hcx.hash_hir_ty(self, hasher)
110 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for VisibilityKind<'_> {
111 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
112 hcx.hash_hir_visibility_kind(self, hasher)
116 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for TraitItem<'_> {
117 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
118 let TraitItem { hir_id: _, ident, ref attrs, ref generics, ref kind, span } = *self;
120 hcx.hash_hir_item_like(|hcx| {
121 ident.name.hash_stable(hcx, hasher);
122 attrs.hash_stable(hcx, hasher);
123 generics.hash_stable(hcx, hasher);
124 kind.hash_stable(hcx, hasher);
125 span.hash_stable(hcx, hasher);
130 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for ImplItem<'_> {
131 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
143 hcx.hash_hir_item_like(|hcx| {
144 ident.name.hash_stable(hcx, hasher);
145 vis.hash_stable(hcx, hasher);
146 defaultness.hash_stable(hcx, hasher);
147 attrs.hash_stable(hcx, hasher);
148 generics.hash_stable(hcx, hasher);
149 kind.hash_stable(hcx, hasher);
150 span.hash_stable(hcx, hasher);
155 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Item<'_> {
156 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
157 let Item { ident, ref attrs, hir_id: _, ref kind, ref vis, span } = *self;
159 hcx.hash_hir_item_like(|hcx| {
160 ident.name.hash_stable(hcx, hasher);
161 attrs.hash_stable(hcx, hasher);
162 kind.hash_stable(hcx, hasher);
163 vis.hash_stable(hcx, hasher);
164 span.hash_stable(hcx, hasher);