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:
10 rustc_ast::HashStableContext + rustc_target::HashStableContext
12 fn hash_hir_id(&mut self, _: HirId, hasher: &mut StableHasher);
13 fn hash_body_id(&mut self, _: BodyId, hasher: &mut StableHasher);
14 fn hash_reference_to_item(&mut self, _: HirId, hasher: &mut StableHasher);
15 fn hash_hir_mod(&mut self, _: &Mod<'_>, hasher: &mut StableHasher);
16 fn hash_hir_expr(&mut self, _: &Expr<'_>, hasher: &mut StableHasher);
17 fn hash_hir_ty(&mut self, _: &Ty<'_>, hasher: &mut StableHasher);
18 fn hash_hir_visibility_kind(&mut self, _: &VisibilityKind<'_>, hasher: &mut StableHasher);
21 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for HirId {
22 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
23 hcx.hash_hir_id(*self, hasher)
27 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for BodyId {
28 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
29 hcx.hash_body_id(*self, hasher)
33 // The following implementations of HashStable for `ItemId`, `TraitItemId`, and
34 // `ImplItemId` deserve special attention. Normally we do not hash `NodeId`s within
35 // the HIR, since they just signify a HIR nodes own path. But `ItemId` et al
36 // are used when another item in the HIR is *referenced* and we certainly
37 // want to pick up on a reference changing its target, so we hash the NodeIds
40 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for ItemId {
41 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
42 hcx.hash_reference_to_item(self.id, hasher)
46 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for ImplItemId {
47 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
48 hcx.hash_reference_to_item(self.hir_id, hasher)
52 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for TraitItemId {
53 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
54 hcx.hash_reference_to_item(self.hir_id, hasher)
58 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Mod<'_> {
59 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
60 hcx.hash_hir_mod(self, hasher)
64 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Expr<'_> {
65 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
66 hcx.hash_hir_expr(self, hasher)
70 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Ty<'_> {
71 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
72 hcx.hash_hir_ty(self, hasher)
76 impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for VisibilityKind<'_> {
77 fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
78 hcx.hash_hir_visibility_kind(self, hasher)