1 use rustc_data_structures::stable_hasher::{HashStable, StableHasher, ToStableHashKey};
4 BodyId, Expr, ForeignItem, ForeignItemId, ImplItem, ImplItemId, Item, ItemId, MacroDef, Mod,
5 TraitItem, TraitItemId, Ty, VisibilityKind,
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 ItemId {
38 type KeyType = DefPathHash;
41 fn to_stable_hash_key(&self, hcx: &HirCtx) -> DefPathHash {
42 hcx.local_def_path_hash(self.def_id)
46 impl<HirCtx: crate::HashStableContext> ToStableHashKey<HirCtx> for TraitItemId {
47 type KeyType = DefPathHash;
50 fn to_stable_hash_key(&self, hcx: &HirCtx) -> DefPathHash {
51 hcx.local_def_path_hash(self.def_id)
55 impl<HirCtx: crate::HashStableContext> ToStableHashKey<HirCtx> for ImplItemId {
56 type KeyType = DefPathHash;
59 fn to_stable_hash_key(&self, hcx: &HirCtx) -> DefPathHash {
60 hcx.local_def_path_hash(self.def_id)
64 impl<HirCtx: crate::HashStableContext> ToStableHashKey<HirCtx> for ForeignItemId {
65 type KeyType = DefPathHash;
68 fn to_stable_hash_key(&self, hcx: &HirCtx) -> DefPathHash {
69 hcx.local_def_path_hash(self.def_id)
73 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for HirId {
74 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
75 hcx.hash_hir_id(*self, hasher)
79 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for BodyId {
80 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
81 hcx.hash_body_id(*self, hasher)
85 // The following implementations of HashStable for `ItemId`, `TraitItemId`, and
86 // `ImplItemId` deserve special attention. Normally we do not hash `NodeId`s within
87 // the HIR, since they just signify a HIR nodes own path. But `ItemId` et al
88 // are used when another item in the HIR is *referenced* and we certainly
89 // want to pick up on a reference changing its target, so we hash the NodeIds
92 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for ItemId {
93 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
94 hcx.hash_reference_to_item(self.hir_id(), hasher)
98 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for ForeignItemId {
99 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
100 hcx.hash_reference_to_item(self.hir_id(), hasher)
104 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for ImplItemId {
105 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
106 hcx.hash_reference_to_item(self.hir_id(), hasher)
110 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for TraitItemId {
111 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
112 hcx.hash_reference_to_item(self.hir_id(), hasher)
116 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Mod<'_> {
117 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
118 hcx.hash_hir_mod(self, hasher)
122 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Expr<'_> {
123 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
124 hcx.hash_hir_expr(self, hasher)
128 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Ty<'_> {
129 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
130 hcx.hash_hir_ty(self, hasher)
134 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for VisibilityKind<'_> {
135 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
136 hcx.hash_hir_visibility_kind(self, hasher)
140 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for TraitItem<'_> {
141 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
142 let TraitItem { def_id: _, ident, ref attrs, ref generics, ref kind, span } = *self;
144 hcx.hash_hir_item_like(|hcx| {
145 ident.name.hash_stable(hcx, hasher);
146 attrs.hash_stable(hcx, hasher);
147 generics.hash_stable(hcx, hasher);
148 kind.hash_stable(hcx, hasher);
149 span.hash_stable(hcx, hasher);
154 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for ImplItem<'_> {
155 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
167 hcx.hash_hir_item_like(|hcx| {
168 ident.name.hash_stable(hcx, hasher);
169 vis.hash_stable(hcx, hasher);
170 defaultness.hash_stable(hcx, hasher);
171 attrs.hash_stable(hcx, hasher);
172 generics.hash_stable(hcx, hasher);
173 kind.hash_stable(hcx, hasher);
174 span.hash_stable(hcx, hasher);
179 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for ForeignItem<'_> {
180 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
181 let ForeignItem { def_id: _, ident, ref attrs, ref kind, span, ref vis } = *self;
183 hcx.hash_hir_item_like(|hcx| {
184 ident.name.hash_stable(hcx, hasher);
185 attrs.hash_stable(hcx, hasher);
186 kind.hash_stable(hcx, hasher);
187 span.hash_stable(hcx, hasher);
188 vis.hash_stable(hcx, hasher);
193 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Item<'_> {
194 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
195 let Item { ident, ref attrs, def_id: _, ref kind, ref vis, span } = *self;
197 hcx.hash_hir_item_like(|hcx| {
198 ident.name.hash_stable(hcx, hasher);
199 attrs.hash_stable(hcx, hasher);
200 kind.hash_stable(hcx, hasher);
201 vis.hash_stable(hcx, hasher);
202 span.hash_stable(hcx, hasher);
207 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for MacroDef<'_> {
208 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
209 let MacroDef { ident, ref attrs, def_id: _, ref ast, ref vis, span } = *self;
211 hcx.hash_hir_item_like(|hcx| {
212 ident.name.hash_stable(hcx, hasher);
213 attrs.hash_stable(hcx, hasher);
214 ast.hash_stable(hcx, hasher);
215 vis.hash_stable(hcx, hasher);
216 span.hash_stable(hcx, hasher);