Make create_def a query

compiler/rustc_ast_lowering/src/lib.rs

@@ -51,7 +51,6 @@ use rustc_data_structures::tagged_ptr::TaggedRef;
 use rustc_errors::{DiagArgFromDisplay, DiagCtxtHandle};
 use rustc_hir::def::{DefKind, LifetimeRes, Namespace, PartialRes, PerNS, Res};
 use rustc_hir::def_id::{CRATE_DEF_ID, LOCAL_CRATE, LocalDefId};
-use rustc_hir::definitions::PerParentDisambiguatorState;
 use rustc_hir::lints::{AttributeLint, DelayedLint, DynAttribute};
 use rustc_hir::{
     self as hir, AngleBrackets, ConstArg, GenericArg, HirId, ItemLocalMap, LifetimeSource,
@@ -94,7 +93,6 @@ pub mod stability;
 struct LoweringContext<'a, 'hir> {
     tcx: TyCtxt<'hir>,
     resolver: &'a ResolverAstLowering<'hir>,
-    current_disambiguator: PerParentDisambiguatorState,
 
     /// Used to allocate HIR nodes.
     arena: &'hir hir::Arena<'hir>,
@@ -169,7 +167,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         Self {
             tcx,
             resolver,
-            current_disambiguator: Default::default(),
             arena: tcx.hir_arena,
 
             // HirId handling.
@@ -641,11 +638,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
             self.tcx.hir_def_key(self.local_def_id(node_id)),
         );
 
-        let def_id = self
-            .tcx
-            .at(span)
-            .create_def(parent, name, def_kind, None, &mut self.current_disambiguator)
-            .def_id();
+        let def_id = self.tcx.at(span).create_def(parent, name, def_kind, None).def_id();
 
         debug!("create_def: def_id_to_node_id[{:?}] <-> {:?}", def_id, node_id);
         self.node_id_to_def_id.insert(node_id, def_id);
@@ -697,16 +690,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
         f: impl FnOnce(&mut Self) -> hir::OwnerNode<'hir>,
     ) {
         let owner_id = self.owner_id(owner);
-        let def_id = owner_id.def_id;
 
-        let new_disambig = self
-            .resolver
-            .disambiguators
-            .get(&def_id)
-            .map(|s| s.steal())
-            .unwrap_or_else(|| PerParentDisambiguatorState::new(def_id));
-
-        let disambiguator = std::mem::replace(&mut self.current_disambiguator, new_disambig);
         let current_attrs = std::mem::take(&mut self.attrs);
         let current_bodies = std::mem::take(&mut self.bodies);
         let current_define_opaque = std::mem::take(&mut self.define_opaque);
@@ -741,7 +725,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
         assert!(self.impl_trait_bounds.is_empty());
         let info = self.make_owner_info(item);
 
-        self.current_disambiguator = disambiguator;
         self.attrs = current_attrs;
         self.bodies = current_bodies;
         self.define_opaque = current_define_opaque;

compiler/rustc_const_eval/src/interpret/intern.rs

@@ -16,7 +16,7 @@
 use hir::def::DefKind;
 use rustc_ast::Mutability;
 use rustc_data_structures::fx::{FxHashSet, FxIndexMap};
-use rustc_hir::definitions::{DefPathData, PerParentDisambiguatorState};
+use rustc_hir::definitions::DefPathData;
 use rustc_hir::{self as hir};
 use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrs;
 use rustc_middle::mir::interpret::{
@@ -105,7 +105,6 @@ fn intern_shallow<'tcx, M: CompileTimeMachine<'tcx>>(
     ecx: &mut InterpCx<'tcx, M>,
     alloc_id: AllocId,
     mutability: Mutability,
-    disambiguator: Option<&mut PerParentDisambiguatorState>,
 ) -> Result<impl Iterator<Item = CtfeProvenance> + 'tcx, InternError> {
     trace!("intern_shallow {:?}", alloc_id);
     // remove allocation
@@ -124,13 +123,7 @@ fn intern_shallow<'tcx, M: CompileTimeMachine<'tcx>>(
     // link the alloc id to the actual allocation
     let alloc = ecx.tcx.mk_const_alloc(alloc);
     if let Some(static_id) = ecx.machine.static_def_id() {
-        intern_as_new_static(
-            ecx.tcx,
-            static_id,
-            alloc_id,
-            alloc,
-            disambiguator.expect("disambiguator needed"),
-        );
+        intern_as_new_static(ecx.tcx, static_id, alloc_id, alloc);
     } else {
         ecx.tcx.set_alloc_id_memory(alloc_id, alloc);
     }
@@ -144,18 +137,12 @@ fn intern_as_new_static<'tcx>(
     static_id: LocalDefId,
     alloc_id: AllocId,
     alloc: ConstAllocation<'tcx>,
-    disambiguator: &mut PerParentDisambiguatorState,
 ) {
-    // `intern_const_alloc_recursive` is called once per static and it contains the `PerParentDisambiguatorState`.
-    //  The `<static_id>::{{nested}}` path is thus unique to `intern_const_alloc_recursive` and the
-    // `PerParentDisambiguatorState` ensures the generated path is unique for this call as we generate
-    // `<static_id>::{{nested#n}}` where `n` is the `n`th `intern_as_new_static` call.
     let feed = tcx.create_def(
         static_id,
         None,
         DefKind::Static { safety: hir::Safety::Safe, mutability: alloc.0.mutability, nested: true },
         Some(DefPathData::NestedStatic),
-        disambiguator,
     );
     tcx.set_nested_alloc_id_static(alloc_id, feed.def_id());
 
@@ -205,10 +192,6 @@ pub fn intern_const_alloc_recursive<'tcx, M: CompileTimeMachine<'tcx>>(
     intern_kind: InternKind,
     ret: &MPlaceTy<'tcx>,
 ) -> Result<(), InternError> {
-    let mut disambiguator =
-        ecx.machine.static_def_id().map(|id| PerParentDisambiguatorState::new(id));
-    let mut disambiguator = disambiguator.as_mut();
-
     // We are interning recursively, and for mutability we are distinguishing the "root" allocation
     // that we are starting in, and all other allocations that we are encountering recursively.
     let (base_mutability, inner_mutability, is_static) = match intern_kind {
@@ -246,15 +229,13 @@ pub fn intern_const_alloc_recursive<'tcx, M: CompileTimeMachine<'tcx>>(
     // This gives us the initial set of nested allocations, which will then all be processed
     // recursively in the loop below.
     let mut todo: Vec<_> = if is_static {
-        assert!(disambiguator.is_some());
         // Do not steal the root allocation, we need it later to create the return value of `eval_static_initializer`.
         // But still change its mutability to match the requested one.
         let (kind, alloc) = ecx.memory.alloc_map.get_mut(&base_alloc_id).unwrap();
         prepare_alloc(*ecx.tcx, *kind, alloc, base_mutability)?;
         alloc.provenance().ptrs().iter().map(|&(_, prov)| prov).collect()
     } else {
-        assert!(disambiguator.is_none());
-        intern_shallow(ecx, base_alloc_id, base_mutability, None)?.collect()
+        intern_shallow(ecx, base_alloc_id, base_mutability)?.collect()
     };
     // We need to distinguish "has just been interned" from "was already in `tcx`",
     // so we track this in a separate set.
@@ -336,7 +317,7 @@ pub fn intern_const_alloc_recursive<'tcx, M: CompileTimeMachine<'tcx>>(
         // okay with losing some potential for immutability here. This can anyway only affect
         // `static mut`.
         just_interned.insert(alloc_id);
-        let next = intern_shallow(ecx, alloc_id, inner_mutability, disambiguator.as_deref_mut())?;
+        let next = intern_shallow(ecx, alloc_id, inner_mutability)?;
         todo.extend(next);
     }
     if found_bad_mutable_ptr {
@@ -366,7 +347,7 @@ pub fn intern_const_alloc_for_constprop<'tcx, M: CompileTimeMachine<'tcx>>(
         return interp_ok(());
     }
     // Move allocation to `tcx`.
-    if let Some(_) = intern_shallow(ecx, alloc_id, Mutability::Not, None).unwrap().next() {
+    if let Some(_) = intern_shallow(ecx, alloc_id, Mutability::Not).unwrap().next() {
         // We are not doing recursive interning, so we don't currently support provenance.
         // (If this assertion ever triggers, we should just implement a
         // proper recursive interning loop -- or just call `intern_const_alloc_recursive`.
@@ -391,7 +372,7 @@ impl<'tcx> InterpCx<'tcx, DummyMachine> {
         let dest = self.allocate(layout, MemoryKind::Stack)?;
         f(self, &dest.clone().into())?;
         let alloc_id = dest.ptr().provenance.unwrap().alloc_id(); // this was just allocated, it must have provenance
-        for prov in intern_shallow(self, alloc_id, Mutability::Not, None).unwrap() {
+        for prov in intern_shallow(self, alloc_id, Mutability::Not).unwrap() {
             // We are not doing recursive interning, so we don't currently support provenance.
             // (If this assertion ever triggers, we should just implement a
             // proper recursive interning loop -- or just call `intern_const_alloc_recursive`.

compiler/rustc_hir/src/definitions.rs

@@ -11,7 +11,7 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::stable_hasher::StableHasher;
 use rustc_hashes::Hash64;
 use rustc_index::IndexVec;
-use rustc_macros::{BlobDecodable, Decodable, Encodable, extension};
+use rustc_macros::{BlobDecodable, Decodable, Encodable, HashStable_Generic, extension};
 use rustc_span::def_id::LocalDefIdMap;
 use rustc_span::{Symbol, kw, sym};
 use tracing::{debug, instrument};
@@ -277,7 +277,7 @@ impl DefPath {
 }
 
 /// New variants should only be added in synchronization with `enum DefKind`.
-#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, Encodable, BlobDecodable)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, Encodable, BlobDecodable, HashStable_Generic)]
 pub enum DefPathData {
     // Root: these should only be used for the root nodes, because
     // they are treated specially by the `def_path` function.

compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs

@@ -14,8 +14,7 @@ use rustc_ast::visit::walk_list;
 use rustc_data_structures::fx::{FxHashSet, FxIndexMap, FxIndexSet};
 use rustc_errors::ErrorGuaranteed;
 use rustc_hir::def::{DefKind, Res};
-use rustc_hir::def_id::LocalDefIdMap;
-use rustc_hir::definitions::{DefPathData, PerParentDisambiguatorsMap};
+use rustc_hir::definitions::DefPathData;
 use rustc_hir::intravisit::{self, InferKind, Visitor, VisitorExt};
 use rustc_hir::{
     self as hir, AmbigArg, GenericArg, GenericParam, GenericParamKind, HirId, LifetimeKind, Node,
@@ -31,7 +30,6 @@ use rustc_span::{Ident, Span, sym};
 use tracing::{debug, debug_span, instrument};
 
 use crate::errors;
-use crate::hir::definitions::PerParentDisambiguatorState;
 
 #[extension(trait RegionExt)]
 impl ResolvedArg {
@@ -66,7 +64,6 @@ impl ResolvedArg {
 struct BoundVarContext<'a, 'tcx> {
     tcx: TyCtxt<'tcx>,
     rbv: &'a mut ResolveBoundVars<'tcx>,
-    disambiguators: &'a mut LocalDefIdMap<PerParentDisambiguatorState>,
     scope: ScopeRef<'a, 'tcx>,
     opaque_capture_errors: RefCell<Option<OpaqueHigherRankedLifetimeCaptureErrors>>,
 }
@@ -261,7 +258,6 @@ fn resolve_bound_vars(tcx: TyCtxt<'_>, local_def_id: hir::OwnerId) -> ResolveBou
         tcx,
         rbv: &mut rbv,
         scope: &Scope::Root { opt_parent_item: None },
-        disambiguators: &mut Default::default(),
         opaque_capture_errors: RefCell::new(None),
     };
     match tcx.hir_owner_node(local_def_id) {
@@ -1106,12 +1102,11 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
     where
         F: for<'b> FnOnce(&mut BoundVarContext<'b, 'tcx>),
     {
-        let BoundVarContext { tcx, rbv, disambiguators, .. } = self;
+        let BoundVarContext { tcx, rbv, .. } = self;
         let nested_errors = RefCell::new(self.opaque_capture_errors.borrow_mut().take());
         let mut this = BoundVarContext {
             tcx: *tcx,
             rbv,
-            disambiguators,
             scope: &wrap_scope,
             opaque_capture_errors: nested_errors,
         };
@@ -1519,13 +1514,12 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
                 // `opaque_def_id` is unique to the `BoundVarContext` pass which is executed once
                 // per `resolve_bound_vars` query. This is the only location that creates
                 // `OpaqueLifetime` paths. `<opaque_def_id>::OpaqueLifetime(..)` is thus unique
-                // to this query and duplicates within the query are handled by `self.disambiguator`.
+                // to this query.
                 let feed = self.tcx.create_def(
                     opaque_def_id,
                     None,
                     DefKind::LifetimeParam,
                     Some(DefPathData::OpaqueLifetime(ident.name)),
-                    self.disambiguators.get_or_create(opaque_def_id),
                 );
                 feed.def_span(ident.span);
                 feed.def_ident_span(Some(ident.span));

compiler/rustc_interface/src/passes.rs

@@ -11,16 +11,15 @@ use rustc_codegen_ssa::traits::CodegenBackend;
 use rustc_codegen_ssa::{CompiledModules, CrateInfo};
 use rustc_data_structures::indexmap::IndexMap;
 use rustc_data_structures::steal::Steal;
-use rustc_data_structures::sync::{AppendOnlyIndexVec, FreezeLock, WorkerLocal, par_fns};
+use rustc_data_structures::sync::{WorkerLocal, par_fns};
 use rustc_data_structures::thousands;
 use rustc_errors::DiagCallback;
 use rustc_errors::timings::TimingSection;
 use rustc_expand::base::{ExtCtxt, LintStoreExpand};
 use rustc_feature::Features;
 use rustc_fs_util::try_canonicalize;
 use rustc_hir::attrs::AttributeKind;
-use rustc_hir::def_id::{LOCAL_CRATE, StableCrateId, StableCrateIdMap};
-use rustc_hir::definitions::Definitions;
+use rustc_hir::def_id::{LOCAL_CRATE, StableCrateId};
 use rustc_hir::limit::Limit;
 use rustc_hir::lints::DelayedLint;
 use rustc_hir::{Attribute, MaybeOwner, Target, find_attr};
@@ -39,7 +38,6 @@ use rustc_passes::{abi_test, input_stats, layout_test};
 use rustc_resolve::{Resolver, ResolverOutputs};
 use rustc_session::Session;
 use rustc_session::config::{CrateType, Input, OutFileName, OutputFilenames, OutputType};
-use rustc_session::cstore::Untracked;
 use rustc_session::output::{filename_for_input, invalid_output_for_target};
 use rustc_session::parse::feature_err;
 use rustc_session::search_paths::PathKind;
@@ -946,13 +944,7 @@ pub fn create_and_enter_global_ctxt<T, F: for<'tcx> FnOnce(TyCtxt<'tcx>) -> T>(
 
     let dep_graph = setup_dep_graph(sess, crate_name, stable_crate_id);
 
-    let cstore =
-        FreezeLock::new(Box::new(CStore::new(compiler.codegen_backend.metadata_loader())) as _);
-    let definitions = FreezeLock::new(Definitions::new(stable_crate_id));
-
-    let stable_crate_ids = FreezeLock::new(StableCrateIdMap::default());
-    let untracked =
-        Untracked { cstore, source_span: AppendOnlyIndexVec::new(), definitions, stable_crate_ids };
+    let cstore = Box::new(CStore::new(compiler.codegen_backend.metadata_loader())) as _;
 
     // We're constructing the HIR here; we don't care what we will
     // read, since we haven't even constructed the *input* to
@@ -993,7 +985,7 @@ pub fn create_and_enter_global_ctxt<T, F: for<'tcx> FnOnce(TyCtxt<'tcx>) -> T>(
         stable_crate_id,
         &arena,
         &hir_arena,
-        untracked,
+        cstore,
         dep_graph,
         rustc_query_impl::make_dep_kind_vtables(&arena),
         rustc_query_impl::query_system(

compiler/rustc_middle/src/dep_graph/dep_node.rs

@@ -51,14 +51,15 @@ use std::fmt;
 use std::hash::Hash;
 
 use rustc_data_structures::fingerprint::{Fingerprint, PackedFingerprint};
-use rustc_data_structures::stable_hasher::{StableHasher, StableOrd, ToStableHashKey};
+use rustc_data_structures::stable_hasher::{HashStable, StableHasher, StableOrd, ToStableHashKey};
 use rustc_hir::def_id::DefId;
 use rustc_hir::definitions::DefPathHash;
 use rustc_macros::{Decodable, Encodable, HashStable};
 use rustc_span::Symbol;
 
 use super::{KeyFingerprintStyle, SerializedDepNodeIndex};
 use crate::dep_graph::DepNodeKey;
+use crate::ich::StableHashingContext;
 use crate::mono::MonoItem;
 use crate::ty::{TyCtxt, tls};
 
@@ -152,6 +153,14 @@ impl fmt::Debug for DepNode {
     }
 }
 
+impl HashStable<StableHashingContext<'_>> for DepNode {
+    fn hash_stable(&self, hcx: &mut StableHashingContext<'_>, hasher: &mut StableHasher) {
+        let DepNode { kind, key_fingerprint } = self;
+        kind.hash_stable(hcx, hasher);
+        Fingerprint::from(*key_fingerprint).hash_stable(hcx, hasher);
+    }
+}
+
 /// This struct stores function pointers and other metadata for a particular DepKind.
 ///
 /// Information is retrieved by indexing the `DEP_KINDS` array using the integer value
@@ -269,7 +278,7 @@ macro_rules! define_dep_nodes {
         // encoding. The derived Encodable/Decodable uses leb128 encoding which is
         // dense when only considering this enum. But DepKind is encoded in a larger
         // struct, and there we can take advantage of the unused bits in the u16.
-        #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+        #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, HashStable)]
         #[allow(non_camel_case_types)]
         #[repr(u16)] // Must be kept in sync with the rest of `DepKind`.
         pub enum DepKind {