diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/metadata/type_map.rs b/compiler/rustc_codegen_llvm/src/debuginfo/metadata/type_map.rs
index 87fbb737ea8..8fc8118849b 100644
--- a/compiler/rustc_codegen_llvm/src/debuginfo/metadata/type_map.rs
+++ b/compiler/rustc_codegen_llvm/src/debuginfo/metadata/type_map.rs
@@ -93,8 +93,9 @@ pub fn for_vtable_ty(
     /// Right now this takes the form of a hex-encoded opaque hash value.
     pub fn generate_unique_id_string(self, tcx: TyCtxt<'tcx>) -> String {
         let mut hasher = StableHasher::new();
-        let mut hcx = tcx.create_stable_hashing_context();
-        hcx.while_hashing_spans(false, |hcx| self.hash_stable(hcx, &mut hasher));
+        tcx.with_stable_hashing_context(|mut hcx| {
+            hcx.while_hashing_spans(false, |hcx| self.hash_stable(hcx, &mut hasher))
+        });
         hasher.finish::<Fingerprint>().to_hex()
     }
 
diff --git a/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs b/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs
index 8755d91818d..8cd5a0fc247 100644
--- a/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs
+++ b/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs
@@ -701,16 +701,20 @@ fn push_const_param<'tcx>(tcx: TyCtxt<'tcx>, ct: ty::Const<'tcx>, output: &mut S
                 // If we cannot evaluate the constant to a known type, we fall back
                 // to emitting a stable hash value of the constant. This isn't very pretty
                 // but we get a deterministic, virtually unique value for the constant.
-                let hcx = &mut tcx.create_stable_hashing_context();
-                let mut hasher = StableHasher::new();
-                let ct = ct.eval(tcx, ty::ParamEnv::reveal_all());
-                hcx.while_hashing_spans(false, |hcx| ct.to_valtree().hash_stable(hcx, &mut hasher));
+                //
                 // Let's only emit 64 bits of the hash value. That should be plenty for
                 // avoiding collisions and will make the emitted type names shorter.
-                // Note: Don't use `StableHashResult` impl of `u64` here directly, since that
-                // would lead to endianness problems.
-                let hash: u128 = hasher.finish();
-                let hash_short = (hash.to_le() as u64).to_le();
+                let hash_short = tcx.with_stable_hashing_context(|mut hcx| {
+                    let mut hasher = StableHasher::new();
+                    let ct = ct.eval(tcx, ty::ParamEnv::reveal_all());
+                    hcx.while_hashing_spans(false, |hcx| {
+                        ct.to_valtree().hash_stable(hcx, &mut hasher)
+                    });
+                    // Note: Don't use `StableHashResult` impl of `u64` here directly, since that
+                    // would lead to endianness problems.
+                    let hash: u128 = hasher.finish();
+                    (hash.to_le() as u64).to_le()
+                });
 
                 if cpp_like_debuginfo(tcx) {
                     write!(output, "CONST${:x}", hash_short)
diff --git a/compiler/rustc_data_structures/src/lib.rs b/compiler/rustc_data_structures/src/lib.rs
index 390a44d3f33..0a2d2b40709 100644
--- a/compiler/rustc_data_structures/src/lib.rs
+++ b/compiler/rustc_data_structures/src/lib.rs
@@ -10,6 +10,7 @@
 #![feature(array_windows)]
 #![feature(associated_type_bounds)]
 #![feature(auto_traits)]
+#![feature(cell_leak)]
 #![feature(control_flow_enum)]
 #![feature(extend_one)]
 #![feature(let_else)]
diff --git a/compiler/rustc_data_structures/src/sync.rs b/compiler/rustc_data_structures/src/sync.rs
index 4437c0b1b69..cf0940df9e4 100644
--- a/compiler/rustc_data_structures/src/sync.rs
+++ b/compiler/rustc_data_structures/src/sync.rs
@@ -539,6 +539,33 @@ pub fn borrow(&self) -> ReadGuard<'_, T> {
     pub fn borrow_mut(&self) -> WriteGuard<'_, T> {
         self.write()
     }
+
+    #[cfg(not(parallel_compiler))]
+    #[inline(always)]
+    pub fn clone_guard<'a>(rg: &ReadGuard<'a, T>) -> ReadGuard<'a, T> {
+        ReadGuard::clone(rg)
+    }
+
+    #[cfg(parallel_compiler)]
+    #[inline(always)]
+    pub fn clone_guard<'a>(rg: &ReadGuard<'a, T>) -> ReadGuard<'a, T> {
+        ReadGuard::rwlock(&rg).read()
+    }
+
+    #[cfg(not(parallel_compiler))]
+    #[inline(always)]
+    pub fn leak(&self) -> &T {
+        ReadGuard::leak(self.read())
+    }
+
+    #[cfg(parallel_compiler)]
+    #[inline(always)]
+    pub fn leak(&self) -> &T {
+        let guard = self.read();
+        let ret = unsafe { &*(&*guard as *const T) };
+        std::mem::forget(guard);
+        ret
+    }
 }
 
 // FIXME: Probably a bad idea
diff --git a/compiler/rustc_metadata/src/rmeta/encoder.rs b/compiler/rustc_metadata/src/rmeta/encoder.rs
index bb4b502bded..7e07898ff52 100644
--- a/compiler/rustc_metadata/src/rmeta/encoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/encoder.rs
@@ -423,7 +423,7 @@ fn encode_info_for_items(&mut self) {
     }
 
     fn encode_def_path_table(&mut self) {
-        let table = self.tcx.definitions_untracked().def_path_table();
+        let table = self.tcx.def_path_table();
         if self.is_proc_macro {
             for def_index in std::iter::once(CRATE_DEF_INDEX)
                 .chain(self.tcx.resolutions(()).proc_macros.iter().map(|p| p.local_def_index))
@@ -443,9 +443,7 @@ fn encode_def_path_table(&mut self) {
     }
 
     fn encode_def_path_hash_map(&mut self) -> LazyValue<DefPathHashMapRef<'static>> {
-        self.lazy(DefPathHashMapRef::BorrowedFromTcx(
-            self.tcx.definitions_untracked().def_path_hash_to_def_index_map(),
-        ))
+        self.lazy(DefPathHashMapRef::BorrowedFromTcx(self.tcx.def_path_hash_to_def_index_map()))
     }
 
     fn encode_source_map(&mut self) -> LazyArray<rustc_span::SourceFile> {
@@ -614,7 +612,8 @@ fn encode_crate_root(&mut self) -> LazyValue<CrateRoot> {
         let interpret_alloc_index_bytes = self.position() - i;
 
         // Encode the proc macro data. This affects 'tables',
-        // so we need to do this before we encode the tables
+        // so we need to do this before we encode the tables.
+        // This overwrites def_keys, so it must happen after encode_def_path_table.
         i = self.position();
         let proc_macro_data = self.encode_proc_macros();
         let proc_macro_data_bytes = self.position() - i;
@@ -992,8 +991,7 @@ fn encode_def_ids(&mut self) {
             return;
         }
         let tcx = self.tcx;
-        let hir = tcx.hir();
-        for local_id in hir.iter_local_def_id() {
+        for local_id in tcx.iter_local_def_id() {
             let def_id = local_id.to_def_id();
             let def_kind = tcx.opt_def_kind(local_id);
             let Some(def_kind) = def_kind else { continue };
@@ -1854,12 +1852,13 @@ fn encode_incoherent_impls(&mut self) -> LazyArray<IncoherentImpls> {
         debug!("EncodeContext::encode_traits_and_impls()");
         empty_proc_macro!(self);
         let tcx = self.tcx;
-        let mut ctx = tcx.create_stable_hashing_context();
         let mut all_impls: Vec<_> = tcx.crate_inherent_impls(()).incoherent_impls.iter().collect();
-        all_impls.sort_by_cached_key(|&(&simp, _)| {
-            let mut hasher = StableHasher::new();
-            simp.hash_stable(&mut ctx, &mut hasher);
-            hasher.finish::<Fingerprint>();
+        tcx.with_stable_hashing_context(|mut ctx| {
+            all_impls.sort_by_cached_key(|&(&simp, _)| {
+                let mut hasher = StableHasher::new();
+                simp.hash_stable(&mut ctx, &mut hasher);
+                hasher.finish::<Fingerprint>()
+            })
         });
         let all_impls: Vec<_> = all_impls
             .into_iter()
diff --git a/compiler/rustc_middle/src/dep_graph/mod.rs b/compiler/rustc_middle/src/dep_graph/mod.rs
index e335cb395f8..5f3f1a3bc6c 100644
--- a/compiler/rustc_middle/src/dep_graph/mod.rs
+++ b/compiler/rustc_middle/src/dep_graph/mod.rs
@@ -71,8 +71,8 @@ impl<'tcx> DepContext for TyCtxt<'tcx> {
     type DepKind = DepKind;
 
     #[inline]
-    fn create_stable_hashing_context(&self) -> StableHashingContext<'_> {
-        TyCtxt::create_stable_hashing_context(*self)
+    fn with_stable_hashing_context<R>(&self, f: impl FnOnce(StableHashingContext<'_>) -> R) -> R {
+        TyCtxt::with_stable_hashing_context(*self, f)
     }
 
     #[inline]
diff --git a/compiler/rustc_middle/src/hir/map/mod.rs b/compiler/rustc_middle/src/hir/map/mod.rs
index 3539acbc06e..3ac302ef0ed 100644
--- a/compiler/rustc_middle/src/hir/map/mod.rs
+++ b/compiler/rustc_middle/src/hir/map/mod.rs
@@ -218,13 +218,6 @@ pub fn local_def_id_to_hir_id(self, def_id: LocalDefId) -> HirId {
         self.tcx.local_def_id_to_hir_id(def_id)
     }
 
-    pub fn iter_local_def_id(self) -> impl Iterator<Item = LocalDefId> + 'hir {
-        // Create a dependency to the crate to be sure we re-execute this when the amount of
-        // definitions change.
-        self.tcx.ensure().hir_crate(());
-        self.tcx.definitions_untracked().iter_local_def_id()
-    }
-
     /// Do not call this function directly. The query should be called.
     pub(super) fn opt_def_kind(self, local_def_id: LocalDefId) -> Option<DefKind> {
         let hir_id = self.local_def_id_to_hir_id(local_def_id);
@@ -1141,34 +1134,35 @@ pub(super) fn crate_hash(tcx: TyCtxt<'_>, crate_num: CrateNum) -> Svh {
 
     source_file_names.sort_unstable();
 
-    let mut hcx = tcx.create_stable_hashing_context();
-    let mut stable_hasher = StableHasher::new();
-    hir_body_hash.hash_stable(&mut hcx, &mut stable_hasher);
-    upstream_crates.hash_stable(&mut hcx, &mut stable_hasher);
-    source_file_names.hash_stable(&mut hcx, &mut stable_hasher);
-    if tcx.sess.opts.debugging_opts.incremental_relative_spans {
-        let definitions = &tcx.definitions_untracked();
-        let mut owner_spans: Vec<_> = krate
-            .owners
-            .iter_enumerated()
-            .filter_map(|(def_id, info)| {
-                let _ = info.as_owner()?;
-                let def_path_hash = definitions.def_path_hash(def_id);
-                let span = resolutions.source_span[def_id];
-                debug_assert_eq!(span.parent(), None);
-                Some((def_path_hash, span))
-            })
-            .collect();
-        owner_spans.sort_unstable_by_key(|bn| bn.0);
-        owner_spans.hash_stable(&mut hcx, &mut stable_hasher);
-    }
-    tcx.sess.opts.dep_tracking_hash(true).hash_stable(&mut hcx, &mut stable_hasher);
-    tcx.sess.local_stable_crate_id().hash_stable(&mut hcx, &mut stable_hasher);
-    // Hash visibility information since it does not appear in HIR.
-    resolutions.visibilities.hash_stable(&mut hcx, &mut stable_hasher);
-    resolutions.has_pub_restricted.hash_stable(&mut hcx, &mut stable_hasher);
+    let crate_hash: Fingerprint = tcx.with_stable_hashing_context(|mut hcx| {
+        let mut stable_hasher = StableHasher::new();
+        hir_body_hash.hash_stable(&mut hcx, &mut stable_hasher);
+        upstream_crates.hash_stable(&mut hcx, &mut stable_hasher);
+        source_file_names.hash_stable(&mut hcx, &mut stable_hasher);
+        if tcx.sess.opts.debugging_opts.incremental_relative_spans {
+            let definitions = tcx.definitions_untracked();
+            let mut owner_spans: Vec<_> = krate
+                .owners
+                .iter_enumerated()
+                .filter_map(|(def_id, info)| {
+                    let _ = info.as_owner()?;
+                    let def_path_hash = definitions.def_path_hash(def_id);
+                    let span = resolutions.source_span[def_id];
+                    debug_assert_eq!(span.parent(), None);
+                    Some((def_path_hash, span))
+                })
+                .collect();
+            owner_spans.sort_unstable_by_key(|bn| bn.0);
+            owner_spans.hash_stable(&mut hcx, &mut stable_hasher);
+        }
+        tcx.sess.opts.dep_tracking_hash(true).hash_stable(&mut hcx, &mut stable_hasher);
+        tcx.sess.local_stable_crate_id().hash_stable(&mut hcx, &mut stable_hasher);
+        // Hash visibility information since it does not appear in HIR.
+        resolutions.visibilities.hash_stable(&mut hcx, &mut stable_hasher);
+        resolutions.has_pub_restricted.hash_stable(&mut hcx, &mut stable_hasher);
+        stable_hasher.finish()
+    });
 
-    let crate_hash: Fingerprint = stable_hasher.finish();
     Svh::new(crate_hash.to_smaller_hash())
 }
 
diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
index 57c4f3f3ba3..abc639136d6 100644
--- a/compiler/rustc_middle/src/query/mod.rs
+++ b/compiler/rustc_middle/src/query/mod.rs
@@ -20,6 +20,12 @@
         desc { "trigger a delay span bug" }
     }
 
+    /// Create a new definition within the incr. comp. engine.
+    query register_def(_: ty::RawLocalDefId) -> LocalDefId {
+        eval_always
+        desc { "register a DefId with the incr. comp. engine" }
+    }
+
     query resolutions(_: ()) -> &'tcx ty::ResolverOutputs {
         eval_always
         no_hash
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index af071b4e939..60329fc6eea 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -32,12 +32,13 @@
 use rustc_data_structures::sharded::{IntoPointer, ShardedHashMap};
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::steal::Steal;
-use rustc_data_structures::sync::{self, Lock, Lrc, WorkerLocal};
+use rustc_data_structures::sync::{self, Lock, Lrc, ReadGuard, RwLock, WorkerLocal};
 use rustc_data_structures::vec_map::VecMap;
 use rustc_errors::{DecorateLint, ErrorGuaranteed, LintDiagnosticBuilder, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LocalDefId, LOCAL_CRATE};
+use rustc_hir::definitions::Definitions;
 use rustc_hir::intravisit::Visitor;
 use rustc_hir::lang_items::LangItem;
 use rustc_hir::{
@@ -122,6 +123,9 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
     type PlaceholderRegion = ty::PlaceholderRegion;
 }
 
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, HashStable)]
+pub struct RawLocalDefId(LocalDefId);
+
 /// A type that is not publicly constructable. This prevents people from making [`TyKind::Error`]s
 /// except through the error-reporting functions on a [`tcx`][TyCtxt].
 #[derive(Copy, Clone, Debug, Eq, Hash, PartialEq, PartialOrd, Ord)]
@@ -1069,7 +1073,7 @@ pub struct GlobalCtxt<'tcx> {
     /// Common consts, pre-interned for your convenience.
     pub consts: CommonConsts<'tcx>,
 
-    definitions: rustc_hir::definitions::Definitions,
+    definitions: RwLock<Definitions>,
     cstore: Box<CrateStoreDyn>,
 
     /// Output of the resolver.
@@ -1233,7 +1237,7 @@ pub fn create_global_ctxt(
         s: &'tcx Session,
         lint_store: Lrc<dyn Any + sync::Send + sync::Sync>,
         arena: &'tcx WorkerLocal<Arena<'tcx>>,
-        definitions: rustc_hir::definitions::Definitions,
+        definitions: Definitions,
         cstore: Box<CrateStoreDyn>,
         untracked_resolutions: ty::ResolverOutputs,
         krate: &'tcx hir::Crate<'tcx>,
@@ -1265,7 +1269,7 @@ pub fn create_global_ctxt(
             arena,
             interners,
             dep_graph,
-            definitions,
+            definitions: RwLock::new(definitions),
             cstore,
             untracked_resolutions,
             prof: s.prof.clone(),
@@ -1368,7 +1372,7 @@ pub fn features(self) -> &'tcx rustc_feature::Features {
     pub fn def_key(self, id: DefId) -> rustc_hir::definitions::DefKey {
         // Accessing the DefKey is ok, since it is part of DefPathHash.
         if let Some(id) = id.as_local() {
-            self.definitions.def_key(id)
+            self.definitions_untracked().def_key(id)
         } else {
             self.cstore.def_key(id)
         }
@@ -1382,7 +1386,7 @@ pub fn def_key(self, id: DefId) -> rustc_hir::definitions::DefKey {
     pub fn def_path(self, id: DefId) -> rustc_hir::definitions::DefPath {
         // Accessing the DefPath is ok, since it is part of DefPathHash.
         if let Some(id) = id.as_local() {
-            self.definitions.def_path(id)
+            self.definitions_untracked().def_path(id)
         } else {
             self.cstore.def_path(id)
         }
@@ -1392,7 +1396,7 @@ pub fn def_path(self, id: DefId) -> rustc_hir::definitions::DefPath {
     pub fn def_path_hash(self, def_id: DefId) -> rustc_hir::definitions::DefPathHash {
         // Accessing the DefPathHash is ok, it is incr. comp. stable.
         if let Some(def_id) = def_id.as_local() {
-            self.definitions.def_path_hash(def_id)
+            self.definitions_untracked().def_path_hash(def_id)
         } else {
             self.cstore.def_path_hash(def_id)
         }
@@ -1429,7 +1433,7 @@ pub fn def_path_hash_to_def_id(self, hash: DefPathHash, err: &mut dyn FnMut() ->
         // If this is a DefPathHash from the local crate, we can look up the
         // DefId in the tcx's `Definitions`.
         if stable_crate_id == self.sess.local_stable_crate_id() {
-            self.definitions.local_def_path_hash_to_def_id(hash, err).to_def_id()
+            self.definitions.read().local_def_path_hash_to_def_id(hash, err).to_def_id()
         } else {
             // If this is a DefPathHash from an upstream crate, let the CrateStore map
             // it to a DefId.
@@ -1460,6 +1464,65 @@ pub fn def_path_debug_str(self, def_id: DefId) -> String {
         )
     }
 
+    /// Create a new definition within the incr. comp. engine.
+    pub fn create_def(self, parent: LocalDefId, data: hir::definitions::DefPathData) -> LocalDefId {
+        // The following call has the side effect of modifying the tables inside `definitions`.
+        // These very tables are relied on by the incr. comp. engine to decode DepNodes and to
+        // decode the on-disk cache.
+        let def_id = self.definitions.write().create_def(parent, data);
+
+        // We need to ensure that these side effects are re-run by the incr. comp. engine.
+        // When the incr. comp. engine considers marking this query as green, eval_always requires
+        // we run the function to run.  To invoke it, the parameter cannot be reconstructed from
+        // the DepNode, so the caller query is run.  Luckily, we are inside the caller query,
+        // therefore the definition is properly created.
+        debug_assert!({
+            use rustc_query_system::dep_graph::{DepContext, DepNodeParams};
+            self.is_eval_always(crate::dep_graph::DepKind::register_def)
+                && !<RawLocalDefId as DepNodeParams<TyCtxt<'_>>>::fingerprint_style()
+                    .reconstructible()
+        });
+
+        // Any LocalDefId which is used within queries, either as key or result, either:
+        // - has been created before the construction of the TyCtxt;
+        // - has been created by this call to `register_def`.
+        // As a consequence, this LocalDefId is always re-created before it is needed by the incr.
+        // comp. engine itself.
+        self.register_def(RawLocalDefId(def_id))
+    }
+
+    pub fn iter_local_def_id(self) -> impl Iterator<Item = LocalDefId> + 'tcx {
+        // Create a dependency to the crate to be sure we re-execute this when the amount of
+        // definitions change.
+        self.ensure().hir_crate(());
+        // Leak a read lock once we start iterating on definitions, to prevent adding new onces
+        // while iterating.  If some query needs to add definitions, it should be `ensure`d above.
+        let definitions = self.definitions.leak();
+        definitions.iter_local_def_id()
+    }
+
+    pub fn def_path_table(self) -> &'tcx rustc_hir::definitions::DefPathTable {
+        // Create a dependency to the crate to be sure we reexcute this when the amount of
+        // definitions change.
+        self.ensure().hir_crate(());
+        // Leak a read lock once we start iterating on definitions, to prevent adding new onces
+        // while iterating.  If some query needs to add definitions, it should be `ensure`d above.
+        let definitions = self.definitions.leak();
+        definitions.def_path_table()
+    }
+
+    pub fn def_path_hash_to_def_index_map(
+        self,
+    ) -> &'tcx rustc_hir::def_path_hash_map::DefPathHashMap {
+        // Create a dependency to the crate to be sure we reexcute this when the amount of
+        // definitions change.
+        self.ensure().hir_crate(());
+        // Leak a read lock once we start iterating on definitions, to prevent adding new onces
+        // while iterating.  If some query needs to add definitions, it should be `ensure`d above.
+        let definitions = self.definitions.leak();
+        definitions.def_path_hash_to_def_index_map()
+    }
+
     /// Note that this is *untracked* and should only be used within the query
     /// system if the result is otherwise tracked through queries
     pub fn cstore_untracked(self) -> &'tcx CrateStoreDyn {
@@ -1468,8 +1531,9 @@ pub fn cstore_untracked(self) -> &'tcx CrateStoreDyn {
 
     /// Note that this is *untracked* and should only be used within the query
     /// system if the result is otherwise tracked through queries
-    pub fn definitions_untracked(self) -> &'tcx hir::definitions::Definitions {
-        &self.definitions
+    #[inline]
+    pub fn definitions_untracked(self) -> ReadGuard<'tcx, Definitions> {
+        self.definitions.read()
     }
 
     /// Note that this is *untracked* and should only be used within the query
@@ -1480,23 +1544,33 @@ pub fn source_span_untracked(self, def_id: LocalDefId) -> Span {
     }
 
     #[inline(always)]
-    pub fn create_stable_hashing_context(self) -> StableHashingContext<'tcx> {
-        StableHashingContext::new(
+    pub fn with_stable_hashing_context<R>(
+        self,
+        f: impl FnOnce(StableHashingContext<'_>) -> R,
+    ) -> R {
+        let definitions = self.definitions_untracked();
+        let hcx = StableHashingContext::new(
             self.sess,
-            &self.definitions,
+            &*definitions,
             &*self.cstore,
             &self.untracked_resolutions.source_span,
-        )
+        );
+        f(hcx)
     }
 
     #[inline(always)]
-    pub fn create_no_span_stable_hashing_context(self) -> StableHashingContext<'tcx> {
-        StableHashingContext::ignore_spans(
+    pub fn with_no_span_stable_hashing_context<R>(
+        self,
+        f: impl FnOnce(StableHashingContext<'_>) -> R,
+    ) -> R {
+        let definitions = self.definitions_untracked();
+        let hcx = StableHashingContext::ignore_spans(
             self.sess,
-            &self.definitions,
+            &*definitions,
             &*self.cstore,
             &self.untracked_resolutions.source_span,
-        )
+        );
+        f(hcx)
     }
 
     pub fn serialize_query_result_cache(self, encoder: FileEncoder) -> FileEncodeResult {
@@ -2304,7 +2378,7 @@ pub fn mk_ty(self, st: TyKind<'tcx>) -> Ty<'tcx> {
         self.interners.intern_ty(
             st,
             self.sess,
-            &self.definitions,
+            &self.definitions.read(),
             &*self.cstore,
             // This is only used to create a stable hashing context.
             &self.untracked_resolutions.source_span,
@@ -2953,4 +3027,5 @@ pub fn provide(providers: &mut ty::query::Providers) {
         // We want to check if the panic handler was defined in this crate
         tcx.lang_items().panic_impl().map_or(false, |did| did.is_local())
     };
+    providers.register_def = |_, raw_id| raw_id.0;
 }
diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index 3a795af2121..e00cf3ff9be 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -72,8 +72,8 @@
 pub use self::context::{
     tls, CanonicalUserType, CanonicalUserTypeAnnotation, CanonicalUserTypeAnnotations,
     CtxtInterners, DelaySpanBugEmitted, FreeRegionInfo, GeneratorDiagnosticData,
-    GeneratorInteriorTypeCause, GlobalCtxt, Lift, OnDiskCache, TyCtxt, TypeckResults, UserType,
-    UserTypeAnnotationIndex,
+    GeneratorInteriorTypeCause, GlobalCtxt, Lift, OnDiskCache, RawLocalDefId, TyCtxt,
+    TypeckResults, UserType, UserTypeAnnotationIndex,
 };
 pub use self::instance::{Instance, InstanceDef};
 pub use self::list::List;
diff --git a/compiler/rustc_middle/src/ty/util.rs b/compiler/rustc_middle/src/ty/util.rs
index 3a876df84c2..0e581d7f1f7 100644
--- a/compiler/rustc_middle/src/ty/util.rs
+++ b/compiler/rustc_middle/src/ty/util.rs
@@ -142,16 +142,16 @@ impl<'tcx> TyCtxt<'tcx> {
     /// Creates a hash of the type `Ty` which will be the same no matter what crate
     /// context it's calculated within. This is used by the `type_id` intrinsic.
     pub fn type_id_hash(self, ty: Ty<'tcx>) -> u64 {
-        let mut hasher = StableHasher::new();
-        let mut hcx = self.create_stable_hashing_context();
-
         // We want the type_id be independent of the types free regions, so we
         // erase them. The erase_regions() call will also anonymize bound
         // regions, which is desirable too.
         let ty = self.erase_regions(ty);
 
-        hcx.while_hashing_spans(false, |hcx| ty.hash_stable(hcx, &mut hasher));
-        hasher.finish()
+        self.with_stable_hashing_context(|mut hcx| {
+            let mut hasher = StableHasher::new();
+            hcx.while_hashing_spans(false, |hcx| ty.hash_stable(hcx, &mut hasher));
+            hasher.finish()
+        })
     }
 
     pub fn res_generics_def_id(self, res: Res) -> Option<DefId> {
diff --git a/compiler/rustc_mir_transform/src/coverage/mod.rs b/compiler/rustc_mir_transform/src/coverage/mod.rs
index 782b620e28f..88ad5b7ef14 100644
--- a/compiler/rustc_mir_transform/src/coverage/mod.rs
+++ b/compiler/rustc_mir_transform/src/coverage/mod.rs
@@ -15,7 +15,6 @@
 use crate::MirPass;
 
 use rustc_data_structures::graph::WithNumNodes;
-use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::sync::Lrc;
 use rustc_index::vec::IndexVec;
 use rustc_middle::hir;
@@ -576,12 +575,6 @@ fn get_body_span<'tcx>(
 
 fn hash_mir_source<'tcx>(tcx: TyCtxt<'tcx>, hir_body: &'tcx rustc_hir::Body<'tcx>) -> u64 {
     // FIXME(cjgillot) Stop hashing HIR manually here.
-    let mut hcx = tcx.create_no_span_stable_hashing_context();
-    let mut stable_hasher = StableHasher::new();
     let owner = hir_body.id().hir_id.owner;
-    let bodies = &tcx.hir_owner_nodes(owner).unwrap().bodies;
-    hcx.with_hir_bodies(false, owner, bodies, |hcx| {
-        hir_body.value.hash_stable(hcx, &mut stable_hasher)
-    });
-    stable_hasher.finish()
+    tcx.hir_owner_nodes(owner).unwrap().hash_including_bodies.to_smaller_hash()
 }
diff --git a/compiler/rustc_mir_transform/src/inline.rs b/compiler/rustc_mir_transform/src/inline.rs
index 12f5764152e..8f049a182ee 100644
--- a/compiler/rustc_mir_transform/src/inline.rs
+++ b/compiler/rustc_mir_transform/src/inline.rs
@@ -588,7 +588,7 @@ fn dest_needs_borrow(place: Place<'_>) -> bool {
                 );
                 expn_data.def_site = callee_body.span;
                 let expn_data =
-                    LocalExpnId::fresh(expn_data, self.tcx.create_stable_hashing_context());
+                    self.tcx.with_stable_hashing_context(|hcx| LocalExpnId::fresh(expn_data, hcx));
                 let mut integrator = Integrator {
                     args: &args,
                     new_locals: Local::new(caller_body.local_decls.len())..,
diff --git a/compiler/rustc_query_impl/src/keys.rs b/compiler/rustc_query_impl/src/keys.rs
index 6fbafeb1d32..c3fbba4456e 100644
--- a/compiler/rustc_query_impl/src/keys.rs
+++ b/compiler/rustc_query_impl/src/keys.rs
@@ -39,6 +39,17 @@ fn default_span(&self, _: TyCtxt<'_>) -> Span {
     }
 }
 
+impl Key for ty::RawLocalDefId {
+    #[inline(always)]
+    fn query_crate_is_local(&self) -> bool {
+        true
+    }
+
+    fn default_span(&self, _: TyCtxt<'_>) -> Span {
+        DUMMY_SP
+    }
+}
+
 impl<'tcx> Key for ty::InstanceDef<'tcx> {
     #[inline(always)]
     fn query_crate_is_local(&self) -> bool {
diff --git a/compiler/rustc_query_impl/src/on_disk_cache.rs b/compiler/rustc_query_impl/src/on_disk_cache.rs
index b01c512a3b4..4c25075327f 100644
--- a/compiler/rustc_query_impl/src/on_disk_cache.rs
+++ b/compiler/rustc_query_impl/src/on_disk_cache.rs
@@ -653,12 +653,11 @@ fn decode(decoder: &mut CacheDecoder<'a, 'tcx>) -> Self {
             #[cfg(debug_assertions)]
             {
                 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
-                let mut hcx = decoder.tcx.create_stable_hashing_context();
-                let mut hasher = StableHasher::new();
-                hcx.while_hashing_spans(true, |hcx| {
-                    expn_id.expn_data().hash_stable(hcx, &mut hasher)
+                let local_hash: u64 = decoder.tcx.with_stable_hashing_context(|mut hcx| {
+                    let mut hasher = StableHasher::new();
+                    expn_id.expn_data().hash_stable(&mut hcx, &mut hasher);
+                    hasher.finish()
                 });
-                let local_hash: u64 = hasher.finish();
                 debug_assert_eq!(hash.local_hash(), local_hash);
             }
 
diff --git a/compiler/rustc_query_impl/src/plumbing.rs b/compiler/rustc_query_impl/src/plumbing.rs
index 3ed6632ba66..d0fef364eaf 100644
--- a/compiler/rustc_query_impl/src/plumbing.rs
+++ b/compiler/rustc_query_impl/src/plumbing.rs
@@ -291,11 +291,12 @@ pub fn $name<$tcx>(tcx: QueryCtxt<$tcx>, key: query_keys::$name<$tcx>) -> QueryS
                         .and_then(|def_id| tcx.opt_def_kind(def_id))
                 };
                 let hash = || {
-                    let mut hcx = tcx.create_stable_hashing_context();
-                    let mut hasher = StableHasher::new();
-                    std::mem::discriminant(&kind).hash_stable(&mut hcx, &mut hasher);
-                    key.hash_stable(&mut hcx, &mut hasher);
-                    hasher.finish::<u64>()
+                    tcx.with_stable_hashing_context(|mut hcx|{
+                        let mut hasher = StableHasher::new();
+                        std::mem::discriminant(&kind).hash_stable(&mut hcx, &mut hasher);
+                        key.hash_stable(&mut hcx, &mut hasher);
+                        hasher.finish::<u64>()
+                    })
                 };
 
                 QueryStackFrame::new(name, description, span, def_kind, hash)
diff --git a/compiler/rustc_query_system/src/dep_graph/dep_node.rs b/compiler/rustc_query_system/src/dep_graph/dep_node.rs
index bb2179a2495..c6210095b60 100644
--- a/compiler/rustc_query_system/src/dep_graph/dep_node.rs
+++ b/compiler/rustc_query_system/src/dep_graph/dep_node.rs
@@ -131,12 +131,11 @@ impl<Ctxt: DepContext, T> DepNodeParams<Ctxt> for T
 
     #[inline(always)]
     default fn to_fingerprint(&self, tcx: Ctxt) -> Fingerprint {
-        let mut hcx = tcx.create_stable_hashing_context();
-        let mut hasher = StableHasher::new();
-
-        self.hash_stable(&mut hcx, &mut hasher);
-
-        hasher.finish()
+        tcx.with_stable_hashing_context(|mut hcx| {
+            let mut hasher = StableHasher::new();
+            self.hash_stable(&mut hcx, &mut hasher);
+            hasher.finish()
+        })
     }
 
     #[inline(always)]
diff --git a/compiler/rustc_query_system/src/dep_graph/graph.rs b/compiler/rustc_query_system/src/dep_graph/graph.rs
index 341cf8f827b..0e1419f8a48 100644
--- a/compiler/rustc_query_system/src/dep_graph/graph.rs
+++ b/compiler/rustc_query_system/src/dep_graph/graph.rs
@@ -328,10 +328,8 @@ fn with_task_impl<Ctxt: HasDepContext<DepKind = K>, A: Debug, R>(
 
         let dcx = cx.dep_context();
         let hashing_timer = dcx.profiler().incr_result_hashing();
-        let current_fingerprint = hash_result.map(|f| {
-            let mut hcx = dcx.create_stable_hashing_context();
-            f(&mut hcx, &result)
-        });
+        let current_fingerprint =
+            hash_result.map(|f| dcx.with_stable_hashing_context(|mut hcx| f(&mut hcx, &result)));
 
         let print_status = cfg!(debug_assertions) && dcx.sess().opts.debugging_opts.dep_tasks;
 
diff --git a/compiler/rustc_query_system/src/dep_graph/mod.rs b/compiler/rustc_query_system/src/dep_graph/mod.rs
index 5907ae309ca..345ada263e4 100644
--- a/compiler/rustc_query_system/src/dep_graph/mod.rs
+++ b/compiler/rustc_query_system/src/dep_graph/mod.rs
@@ -23,7 +23,7 @@ pub trait DepContext: Copy {
     type DepKind: self::DepKind;
 
     /// Create a hashing context for hashing new results.
-    fn create_stable_hashing_context(&self) -> StableHashingContext<'_>;
+    fn with_stable_hashing_context<R>(&self, f: impl FnOnce(StableHashingContext<'_>) -> R) -> R;
 
     /// Access the DepGraph.
     fn dep_graph(&self) -> &DepGraph<Self::DepKind>;
diff --git a/compiler/rustc_query_system/src/ich/hcx.rs b/compiler/rustc_query_system/src/ich/hcx.rs
index 62a1f776fb3..89b9a80ee4d 100644
--- a/compiler/rustc_query_system/src/ich/hcx.rs
+++ b/compiler/rustc_query_system/src/ich/hcx.rs
@@ -1,4 +1,5 @@
 use crate::ich;
+
 use rustc_ast as ast;
 use rustc_data_structures::sorted_map::SortedMap;
 use rustc_data_structures::stable_hasher::{HashStable, HashingControls, StableHasher};
diff --git a/compiler/rustc_query_system/src/query/plumbing.rs b/compiler/rustc_query_system/src/query/plumbing.rs
index 3e4c7ad9f8f..bbcd00be943 100644
--- a/compiler/rustc_query_system/src/query/plumbing.rs
+++ b/compiler/rustc_query_system/src/query/plumbing.rs
@@ -542,8 +542,7 @@ fn incremental_verify_ich<CTX, K, V: Debug>(
 
     debug!("BEGIN verify_ich({:?})", dep_node);
     let new_hash = query.hash_result.map_or(Fingerprint::ZERO, |f| {
-        let mut hcx = tcx.create_stable_hashing_context();
-        f(&mut hcx, result)
+        tcx.with_stable_hashing_context(|mut hcx| f(&mut hcx, result))
     });
     let old_hash = tcx.dep_graph().prev_fingerprint_of(dep_node);
     debug!("END verify_ich({:?})", dep_node);
diff --git a/compiler/rustc_symbol_mangling/src/legacy.rs b/compiler/rustc_symbol_mangling/src/legacy.rs
index 470438471cb..e3045c9321d 100644
--- a/compiler/rustc_symbol_mangling/src/legacy.rs
+++ b/compiler/rustc_symbol_mangling/src/legacy.rs
@@ -96,47 +96,48 @@ fn get_symbol_hash<'tcx>(
     let substs = instance.substs;
     debug!("get_symbol_hash(def_id={:?}, parameters={:?})", def_id, substs);
 
-    let mut hasher = StableHasher::new();
-    let mut hcx = tcx.create_stable_hashing_context();
+    tcx.with_stable_hashing_context(|mut hcx| {
+        let mut hasher = StableHasher::new();
 
-    record_time(&tcx.sess.perf_stats.symbol_hash_time, || {
-        // the main symbol name is not necessarily unique; hash in the
-        // compiler's internal def-path, guaranteeing each symbol has a
-        // truly unique path
-        tcx.def_path_hash(def_id).hash_stable(&mut hcx, &mut hasher);
+        record_time(&tcx.sess.perf_stats.symbol_hash_time, || {
+            // the main symbol name is not necessarily unique; hash in the
+            // compiler's internal def-path, guaranteeing each symbol has a
+            // truly unique path
+            tcx.def_path_hash(def_id).hash_stable(&mut hcx, &mut hasher);
 
-        // Include the main item-type. Note that, in this case, the
-        // assertions about `needs_subst` may not hold, but this item-type
-        // ought to be the same for every reference anyway.
-        assert!(!item_type.has_erasable_regions());
-        hcx.while_hashing_spans(false, |hcx| {
-            item_type.hash_stable(hcx, &mut hasher);
+            // Include the main item-type. Note that, in this case, the
+            // assertions about `needs_subst` may not hold, but this item-type
+            // ought to be the same for every reference anyway.
+            assert!(!item_type.has_erasable_regions());
+            hcx.while_hashing_spans(false, |hcx| {
+                item_type.hash_stable(hcx, &mut hasher);
 
-            // If this is a function, we hash the signature as well.
-            // This is not *strictly* needed, but it may help in some
-            // situations, see the `run-make/a-b-a-linker-guard` test.
-            if let ty::FnDef(..) = item_type.kind() {
-                item_type.fn_sig(tcx).hash_stable(hcx, &mut hasher);
-            }
+                // If this is a function, we hash the signature as well.
+                // This is not *strictly* needed, but it may help in some
+                // situations, see the `run-make/a-b-a-linker-guard` test.
+                if let ty::FnDef(..) = item_type.kind() {
+                    item_type.fn_sig(tcx).hash_stable(hcx, &mut hasher);
+                }
 
-            // also include any type parameters (for generic items)
-            substs.hash_stable(hcx, &mut hasher);
+                // also include any type parameters (for generic items)
+                substs.hash_stable(hcx, &mut hasher);
 
-            if let Some(instantiating_crate) = instantiating_crate {
-                tcx.def_path_hash(instantiating_crate.as_def_id())
-                    .stable_crate_id()
-                    .hash_stable(hcx, &mut hasher);
-            }
+                if let Some(instantiating_crate) = instantiating_crate {
+                    tcx.def_path_hash(instantiating_crate.as_def_id())
+                        .stable_crate_id()
+                        .hash_stable(hcx, &mut hasher);
+                }
 
-            // We want to avoid accidental collision between different types of instances.
-            // Especially, `VtableShim`s and `ReifyShim`s may overlap with their original
-            // instances without this.
-            discriminant(&instance.def).hash_stable(hcx, &mut hasher);
+                // We want to avoid accidental collision between different types of instances.
+                // Especially, `VtableShim`s and `ReifyShim`s may overlap with their original
+                // instances without this.
+                discriminant(&instance.def).hash_stable(hcx, &mut hasher);
+            });
         });
-    });
 
-    // 64 bits should be enough to avoid collisions.
-    hasher.finish::<u64>()
+        // 64 bits should be enough to avoid collisions.
+        hasher.finish::<u64>()
+    })
 }
 
 // Follow C++ namespace-mangling style, see
diff --git a/src/librustdoc/passes/check_code_block_syntax.rs b/src/librustdoc/passes/check_code_block_syntax.rs
index 8bf0971ccb5..0172ef5700b 100644
--- a/src/librustdoc/passes/check_code_block_syntax.rs
+++ b/src/librustdoc/passes/check_code_block_syntax.rs
@@ -53,7 +53,8 @@ fn check_rust_syntax(&self, item: &clean::Item, dox: &str, code_block: RustCodeB
             None,
             None,
         );
-        let expn_id = LocalExpnId::fresh(expn_data, self.cx.tcx.create_stable_hashing_context());
+        let expn_id =
+            self.cx.tcx.with_stable_hashing_context(|hcx| LocalExpnId::fresh(expn_data, hcx));
         let span = DUMMY_SP.fresh_expansion(expn_id);
 
         let is_empty = rustc_driver::catch_fatal_errors(|| {