Rollup of 5 pull requests

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -353,9 +353,8 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
 
         // We use the statements were the binding was initialized, and inspect the HIR to look
         // for the branching codepaths that aren't covered, to point at them.
-        let hir_id = self.mir_hir_id();
         let map = self.infcx.tcx.hir();
-        let body_id = map.body_owned_by(hir_id);
+        let body_id = map.body_owned_by(self.mir_def_id());
         let body = map.body(body_id);
 
         let mut visitor = ConditionVisitor { spans: &spans, name: &name, errors: vec![] };

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -853,7 +853,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
         let closure_id = self.mir_hir_id();
         let fn_call_id = hir.get_parent_node(closure_id);
         let node = hir.get(fn_call_id);
-        let item_id = hir.enclosing_body_owner(fn_call_id);
+        let def_id = hir.enclosing_body_owner(fn_call_id);
         let mut look_at_return = true;
         // If we can detect the expression to be an `fn` call where the closure was an argument,
         // we point at the `fn` definition argument...
@@ -864,7 +864,6 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                 .filter(|(_, arg)| arg.hir_id == closure_id)
                 .map(|(pos, _)| pos)
                 .next();
-            let def_id = hir.local_def_id(item_id);
             let tables = self.infcx.tcx.typeck(def_id);
             if let Some(ty::FnDef(def_id, _)) =
                 tables.node_type_opt(func.hir_id).as_ref().map(|ty| ty.kind())

compiler/rustc_data_structures/src/stable_hasher.rs

@@ -3,6 +3,7 @@ use rustc_index::bit_set;
 use rustc_index::vec;
 use smallvec::SmallVec;
 use std::hash::{BuildHasher, Hash, Hasher};
+use std::marker::PhantomData;
 use std::mem;
 
 #[cfg(test)]
@@ -261,6 +262,10 @@ impl<CTX> HashStable<CTX> for ! {
     }
 }
 
+impl<CTX, T> HashStable<CTX> for PhantomData<T> {
+    fn hash_stable(&self, _ctx: &mut CTX, _hasher: &mut StableHasher) {}
+}
+
 impl<CTX> HashStable<CTX> for ::std::num::NonZeroU32 {
     #[inline]
     fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher) {

compiler/rustc_driver/src/pretty.rs

@@ -328,7 +328,7 @@ impl<'tcx> pprust_hir::PpAnn for TypedAnnotation<'tcx> {
             let typeck_results = self.maybe_typeck_results.get().or_else(|| {
                 self.tcx
                     .hir()
-                    .maybe_body_owned_by(self.tcx.hir().local_def_id_to_hir_id(expr.hir_id.owner))
+                    .maybe_body_owned_by(expr.hir_id.owner)
                     .map(|body_id| self.tcx.typeck_body(body_id))
             });
 

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/util.rs

@@ -49,10 +49,10 @@ pub fn find_param_with_region<'tcx>(
     };
 
     let hir = &tcx.hir();
-    let hir_id = hir.local_def_id_to_hir_id(id.as_local()?);
-    let body_id = hir.maybe_body_owned_by(hir_id)?;
-    let body = hir.body(body_id);
+    let def_id = id.as_local()?;
+    let hir_id = hir.local_def_id_to_hir_id(def_id);
 
+    // FIXME: use def_kind
     // Don't perform this on closures
     match hir.get(hir_id) {
         hir::Node::Expr(&hir::Expr { kind: hir::ExprKind::Closure { .. }, .. }) => {
@@ -61,11 +61,14 @@ pub fn find_param_with_region<'tcx>(
         _ => {}
     }
 
+    let body_id = hir.maybe_body_owned_by(def_id)?;
+
     let owner_id = hir.body_owner(body_id);
     let fn_decl = hir.fn_decl_by_hir_id(owner_id).unwrap();
     let poly_fn_sig = tcx.fn_sig(id);
 
     let fn_sig = tcx.liberate_late_bound_regions(id, poly_fn_sig);
+    let body = hir.body(body_id);
     body.params
         .iter()
         .take(if fn_sig.c_variadic {

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -1616,7 +1616,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
     fn encode_info_for_anon_const(&mut self, id: hir::HirId) {
         let def_id = self.tcx.hir().local_def_id(id);
         debug!("EncodeContext::encode_info_for_anon_const({:?})", def_id);
-        let body_id = self.tcx.hir().body_owned_by(id);
+        let body_id = self.tcx.hir().body_owned_by(def_id);
         let const_data = self.encode_rendered_const_for_body(body_id);
         let qualifs = self.tcx.mir_const_qualif(def_id);
 

compiler/rustc_middle/src/hir/map/mod.rs

@@ -396,10 +396,10 @@ impl<'hir> Map<'hir> {
         }
     }
 
-    pub fn enclosing_body_owner(self, hir_id: HirId) -> HirId {
+    pub fn enclosing_body_owner(self, hir_id: HirId) -> LocalDefId {
         for (parent, _) in self.parent_iter(hir_id) {
-            if let Some(body) = self.maybe_body_owned_by(parent) {
-                return self.body_owner(body);
+            if let Some(body) = self.find(parent).map(associated_body).flatten() {
+                return self.body_owner_def_id(body);
             }
         }
 
@@ -419,19 +419,20 @@ impl<'hir> Map<'hir> {
         self.local_def_id(self.body_owner(id))
     }
 
-    /// Given a `HirId`, returns the `BodyId` associated with it,
+    /// Given a `LocalDefId`, returns the `BodyId` associated with it,
     /// if the node is a body owner, otherwise returns `None`.
-    pub fn maybe_body_owned_by(self, hir_id: HirId) -> Option<BodyId> {
-        self.find(hir_id).map(associated_body).flatten()
+    pub fn maybe_body_owned_by(self, id: LocalDefId) -> Option<BodyId> {
+        self.get_if_local(id.to_def_id()).map(associated_body).flatten()
     }
 
     /// Given a body owner's id, returns the `BodyId` associated with it.
-    pub fn body_owned_by(self, id: HirId) -> BodyId {
+    pub fn body_owned_by(self, id: LocalDefId) -> BodyId {
         self.maybe_body_owned_by(id).unwrap_or_else(|| {
+            let hir_id = self.local_def_id_to_hir_id(id);
             span_bug!(
-                self.span(id),
+                self.span(hir_id),
                 "body_owned_by: {} has no associated body",
-                self.node_to_string(id)
+                self.node_to_string(hir_id)
             );
         })
     }
@@ -670,7 +671,7 @@ impl<'hir> Map<'hir> {
     /// Whether the expression pointed at by `hir_id` belongs to a `const` evaluation context.
     /// Used exclusively for diagnostics, to avoid suggestion function calls.
     pub fn is_inside_const_context(self, hir_id: HirId) -> bool {
-        self.body_const_context(self.local_def_id(self.enclosing_body_owner(hir_id))).is_some()
+        self.body_const_context(self.enclosing_body_owner(hir_id)).is_some()
     }
 
     /// Retrieves the `HirId` for `id`'s enclosing method, unless there's a

compiler/rustc_middle/src/hir/mod.rs

@@ -157,8 +157,9 @@ pub fn provide(providers: &mut Providers) {
     };
     providers.fn_arg_names = |tcx, id| {
         let hir = tcx.hir();
-        let hir_id = hir.local_def_id_to_hir_id(id.expect_local());
-        if let Some(body_id) = hir.maybe_body_owned_by(hir_id) {
+        let def_id = id.expect_local();
+        let hir_id = hir.local_def_id_to_hir_id(def_id);
+        if let Some(body_id) = hir.maybe_body_owned_by(def_id) {
             tcx.arena.alloc_from_iter(hir.body_param_names(body_id))
         } else if let Node::TraitItem(&TraitItem {
             kind: TraitItemKind::Fn(_, TraitFn::Required(idents)),

compiler/rustc_middle/src/traits/query.rs

@@ -9,13 +9,9 @@ use crate::infer::canonical::{Canonical, QueryResponse};
 use crate::ty::error::TypeError;
 use crate::ty::subst::GenericArg;
 use crate::ty::{self, Ty, TyCtxt};
-
-use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_errors::struct_span_err;
-use rustc_query_system::ich::StableHashingContext;
 use rustc_span::source_map::Span;
 use std::iter::FromIterator;
-use std::mem;
 
 pub mod type_op {
     use crate::ty::fold::TypeFoldable;
@@ -226,29 +222,9 @@ pub struct NormalizationResult<'tcx> {
 /// case they are called implied bounds). They are fed to the
 /// `OutlivesEnv` which in turn is supplied to the region checker and
 /// other parts of the inference system.
-#[derive(Clone, Debug, TypeFoldable, TypeVisitable, Lift)]
+#[derive(Clone, Debug, TypeFoldable, TypeVisitable, Lift, HashStable)]
 pub enum OutlivesBound<'tcx> {
     RegionSubRegion(ty::Region<'tcx>, ty::Region<'tcx>),
     RegionSubParam(ty::Region<'tcx>, ty::ParamTy),
     RegionSubProjection(ty::Region<'tcx>, ty::ProjectionTy<'tcx>),
 }
-
-impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for OutlivesBound<'tcx> {
-    fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
-        mem::discriminant(self).hash_stable(hcx, hasher);
-        match *self {
-            OutlivesBound::RegionSubRegion(ref a, ref b) => {
-                a.hash_stable(hcx, hasher);
-                b.hash_stable(hcx, hasher);
-            }
-            OutlivesBound::RegionSubParam(ref a, ref b) => {
-                a.hash_stable(hcx, hasher);
-                b.hash_stable(hcx, hasher);
-            }
-            OutlivesBound::RegionSubProjection(ref a, ref b) => {
-                a.hash_stable(hcx, hasher);
-                b.hash_stable(hcx, hasher);
-            }
-        }
-    }
-}

compiler/rustc_middle/src/ty/impls_ty.rs

@@ -101,46 +101,6 @@ impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for ty::subst::GenericArgKin
     }
 }
 
-impl<'a> HashStable<StableHashingContext<'a>> for ty::EarlyBoundRegion {
-    #[inline]
-    fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
-        self.def_id.hash_stable(hcx, hasher);
-        self.index.hash_stable(hcx, hasher);
-        self.name.hash_stable(hcx, hasher);
-    }
-}
-
-impl<'a> HashStable<StableHashingContext<'a>> for ty::RegionVid {
-    #[inline]
-    fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
-        self.index().hash_stable(hcx, hasher);
-    }
-}
-
-impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for ty::ConstVid<'tcx> {
-    #[inline]
-    fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
-        self.index.hash_stable(hcx, hasher);
-    }
-}
-
-impl<'tcx> HashStable<StableHashingContext<'tcx>> for ty::BoundVar {
-    #[inline]
-    fn hash_stable(&self, hcx: &mut StableHashingContext<'tcx>, hasher: &mut StableHasher) {
-        self.index().hash_stable(hcx, hasher);
-    }
-}
-
-impl<'a, 'tcx, T> HashStable<StableHashingContext<'a>> for ty::Binder<'tcx, T>
-where
-    T: HashStable<StableHashingContext<'a>>,
-{
-    fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
-        self.as_ref().skip_binder().hash_stable(hcx, hasher);
-        self.bound_vars().hash_stable(hcx, hasher);
-    }
-}
-
 // AllocIds get resolved to whatever they point to (to be stable)
 impl<'a> HashStable<StableHashingContext<'a>> for mir::interpret::AllocId {
     fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {

compiler/rustc_middle/src/ty/mod.rs

@@ -1182,22 +1182,13 @@ impl<'tcx> OpaqueHiddenType<'tcx> {
 /// identified by both a universe, as well as a name residing within that universe. Distinct bound
 /// regions/types/consts within the same universe simply have an unknown relationship to one
 /// another.
-#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable, PartialOrd, Ord)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
+#[derive(HashStable, TyEncodable, TyDecodable)]
 pub struct Placeholder<T> {
     pub universe: UniverseIndex,
     pub name: T,
 }
 
-impl<'a, T> HashStable<StableHashingContext<'a>> for Placeholder<T>
-where
-    T: HashStable<StableHashingContext<'a>>,
-{
-    fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
-        self.universe.hash_stable(hcx, hasher);
-        self.name.hash_stable(hcx, hasher);
-    }
-}
-
 pub type PlaceholderRegion = Placeholder<BoundRegionKind>;
 
 pub type PlaceholderType = Placeholder<BoundVar>;
@@ -1581,6 +1572,7 @@ impl<'tcx> PolyTraitRef<'tcx> {
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, TypeFoldable, TypeVisitable)]
+#[derive(HashStable)]
 pub struct ParamEnvAnd<'tcx, T> {
     pub param_env: ParamEnv<'tcx>,
     pub value: T,
@@ -1598,18 +1590,6 @@ impl<'tcx, T> ParamEnvAnd<'tcx, T> {
     }
 }
 
-impl<'a, 'tcx, T> HashStable<StableHashingContext<'a>> for ParamEnvAnd<'tcx, T>
-where
-    T: HashStable<StableHashingContext<'a>>,
-{
-    fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
-        let ParamEnvAnd { ref param_env, ref value } = *self;
-
-        param_env.hash_stable(hcx, hasher);
-        value.hash_stable(hcx, hasher);
-    }
-}
-
 #[derive(Copy, Clone, Debug, HashStable, Encodable, Decodable)]
 pub struct Destructor {
     /// The `DefId` of the destructor method

compiler/rustc_middle/src/ty/sty.rs

@@ -1009,6 +1009,7 @@ impl BoundVariableKind {
 ///
 /// `Decodable` and `Encodable` are implemented for `Binder<T>` using the `impl_binder_encode_decode!` macro.
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
+#[derive(HashStable)]
 pub struct Binder<'tcx, T>(T, &'tcx List<BoundVariableKind>);
 
 impl<'tcx, T> Binder<'tcx, T>
@@ -1355,6 +1356,7 @@ impl<'tcx> fmt::Debug for Region<'tcx> {
 }
 
 #[derive(Copy, Clone, PartialEq, Eq, Hash, TyEncodable, TyDecodable, PartialOrd, Ord)]
+#[derive(HashStable)]
 pub struct EarlyBoundRegion {
     pub def_id: DefId,
     pub index: u32,
@@ -1368,14 +1370,16 @@ impl fmt::Debug for EarlyBoundRegion {
 }
 
 /// A **`const`** **v**ariable **ID**.
-#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, TyEncodable, TyDecodable)]
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(HashStable, TyEncodable, TyDecodable)]
 pub struct ConstVid<'tcx> {
     pub index: u32,
     pub phantom: PhantomData<&'tcx ()>,
 }
 
 rustc_index::newtype_index! {
     /// A **region** (lifetime) **v**ariable **ID**.
+    #[derive(HashStable)]
     pub struct RegionVid {
         DEBUG_FORMAT = custom,
     }
@@ -1388,6 +1392,7 @@ impl Atom for RegionVid {
 }
 
 rustc_index::newtype_index! {
+    #[derive(HashStable)]
     pub struct BoundVar { .. }
 }
 

compiler/rustc_mir_build/src/check_unsafety.rs

@@ -626,7 +626,7 @@ pub fn check_unsafety<'tcx>(tcx: TyCtxt<'tcx>, def: ty::WithOptConstParam<LocalD
     if tcx.is_closure(def.did.to_def_id()) {
         let hir = tcx.hir();
         let owner = hir.enclosing_body_owner(hir.local_def_id_to_hir_id(def.did));
-        tcx.ensure().thir_check_unsafety(hir.local_def_id(owner));
+        tcx.ensure().thir_check_unsafety(owner);
         return;
     }
 

compiler/rustc_mir_build/src/thir/cx/mod.rs

@@ -21,7 +21,7 @@ pub(crate) fn thir_body<'tcx>(
     owner_def: ty::WithOptConstParam<LocalDefId>,
 ) -> Result<(&'tcx Steal<Thir<'tcx>>, ExprId), ErrorGuaranteed> {
     let hir = tcx.hir();
-    let body = hir.body(hir.body_owned_by(hir.local_def_id_to_hir_id(owner_def.did)));
+    let body = hir.body(hir.body_owned_by(owner_def.did));
     let mut cx = Cx::new(tcx, owner_def);
     if let Some(reported) = cx.typeck_results.tainted_by_errors {
         return Err(reported);

compiler/rustc_mir_build/src/thir/pattern/check_match.rs

@@ -26,7 +26,7 @@ use rustc_span::{BytePos, Span};
 pub(crate) fn check_match(tcx: TyCtxt<'_>, def_id: DefId) {
     let body_id = match def_id.as_local() {
         None => return,
-        Some(id) => tcx.hir().body_owned_by(tcx.hir().local_def_id_to_hir_id(id)),
+        Some(def_id) => tcx.hir().body_owned_by(def_id),
     };
 
     let pattern_arena = TypedArena::default();

compiler/rustc_mir_transform/src/check_unsafety.rs

@@ -464,15 +464,15 @@ fn check_unused_unsafe(
     def_id: LocalDefId,
     used_unsafe_blocks: &FxHashMap<HirId, UsedUnsafeBlockData>,
 ) -> Vec<(HirId, UnusedUnsafe)> {
-    let hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
-    let body_id = tcx.hir().maybe_body_owned_by(hir_id);
+    let body_id = tcx.hir().maybe_body_owned_by(def_id);
 
     let Some(body_id) = body_id else {
         debug!("check_unused_unsafe({:?}) - no body found", def_id);
         return vec![];
     };
-    let body = tcx.hir().body(body_id);
 
+    let body = tcx.hir().body(body_id);
+    let hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
     let context = match tcx.hir().fn_sig_by_hir_id(hir_id) {
         Some(sig) if sig.header.unsafety == hir::Unsafety::Unsafe => Context::UnsafeFn(hir_id),
         _ => Context::Safe,