1 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
3 use crate::hir::{BodyId, Expr, ImplItemId, ItemId, Mod, TraitItemId, Ty, VisibilityKind};
4 use crate::hir_id::HirId;
6 /// Requirements for a `StableHashingContext` to be used in this crate.
7 /// This is a hack to allow using the `HashStable_Generic` derive macro
8 /// instead of implementing everything in librustc.
9 pub trait HashStableContext: syntax::HashStableContext + rustc_target::HashStableContext {
10 fn hash_hir_id(&mut self, _: HirId, hasher: &mut StableHasher);
11 fn hash_body_id(&mut self, _: BodyId, hasher: &mut StableHasher);
12 fn hash_reference_to_item(&mut self, _: HirId, hasher: &mut StableHasher);
13 fn hash_hir_mod(&mut self, _: &Mod<'_>, hasher: &mut StableHasher);
14 fn hash_hir_expr(&mut self, _: &Expr<'_>, hasher: &mut StableHasher);
15 fn hash_hir_ty(&mut self, _: &Ty<'_>, hasher: &mut StableHasher);
16 fn hash_hir_visibility_kind(&mut self, _: &VisibilityKind<'_>, hasher: &mut StableHasher);
19 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for HirId {
20 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
21 hcx.hash_hir_id(*self, hasher)
25 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for BodyId {
26 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
27 hcx.hash_body_id(*self, hasher)
31 // The following implementations of HashStable for `ItemId`, `TraitItemId`, and
32 // `ImplItemId` deserve special attention. Normally we do not hash `NodeId`s within
33 // the HIR, since they just signify a HIR nodes own path. But `ItemId` et al
34 // are used when another item in the HIR is *referenced* and we certainly
35 // want to pick up on a reference changing its target, so we hash the NodeIds
38 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for ItemId {
39 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
40 hcx.hash_reference_to_item(self.id, hasher)
44 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for ImplItemId {
45 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
46 hcx.hash_reference_to_item(self.hir_id, hasher)
50 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for TraitItemId {
51 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
52 hcx.hash_reference_to_item(self.hir_id, hasher)
56 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Mod<'_> {
57 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
58 hcx.hash_hir_mod(self, hasher)
62 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Expr<'_> {
63 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
64 hcx.hash_hir_expr(self, hasher)
68 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Ty<'_> {
69 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
70 hcx.hash_hir_ty(self, hasher)
74 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for VisibilityKind<'_> {
75 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
76 hcx.hash_hir_visibility_kind(self, hasher)