Add {Local}ModDefId to more strongly type DefIds`

compiler/rustc_hir_analysis/src/check/check.rs

@@ -8,7 +8,7 @@ use rustc_attr as attr;
 use rustc_errors::{Applicability, ErrorGuaranteed, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def::{CtorKind, DefKind, Res};
-use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_ID};
+use rustc_hir::def_id::{DefId, LocalDefId, LocalModDefId};
 use rustc_hir::intravisit::Visitor;
 use rustc_hir::{ItemKind, Node, PathSegment};
 use rustc_infer::infer::opaque_types::ConstrainOpaqueTypeRegionVisitor;
@@ -1443,12 +1443,12 @@ pub(super) fn check_type_params_are_used<'tcx>(
     }
 }
 
-pub(super) fn check_mod_item_types(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
+pub(super) fn check_mod_item_types(tcx: TyCtxt<'_>, module_def_id: LocalModDefId) {
     let module = tcx.hir_module_items(module_def_id);
     for id in module.items() {
         check_item_type(tcx, id);
     }
-    if module_def_id == CRATE_DEF_ID {
+    if module_def_id == LocalModDefId::CRATE_DEF_ID {
         super::entry::check_for_entry_fn(tcx);
     }
 }

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -5,7 +5,7 @@ use rustc_ast as ast;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexSet};
 use rustc_errors::{pluralize, struct_span_err, Applicability, DiagnosticBuilder, ErrorGuaranteed};
 use rustc_hir as hir;
-use rustc_hir::def_id::{DefId, LocalDefId};
+use rustc_hir::def_id::{DefId, LocalDefId, LocalModDefId};
 use rustc_hir::lang_items::LangItem;
 use rustc_hir::ItemKind;
 use rustc_infer::infer::outlives::env::{OutlivesEnvironment, RegionBoundPairs};
@@ -1854,7 +1854,7 @@ impl<'tcx> WfCheckingCtxt<'_, 'tcx> {
     }
 }
 
-fn check_mod_type_wf(tcx: TyCtxt<'_>, module: LocalDefId) {
+fn check_mod_type_wf(tcx: TyCtxt<'_>, module: LocalModDefId) {
     let items = tcx.hir_module_items(module);
     items.par_items(|item| tcx.ensure().check_well_formed(item.owner_id));
     items.par_impl_items(|item| tcx.ensure().check_well_formed(item.owner_id));

compiler/rustc_hir_analysis/src/collect.rs

@@ -22,7 +22,7 @@ use rustc_data_structures::captures::Captures;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_errors::{Applicability, DiagnosticBuilder, ErrorGuaranteed, StashKey};
 use rustc_hir as hir;
-use rustc_hir::def_id::{DefId, LocalDefId};
+use rustc_hir::def_id::{DefId, LocalDefId, LocalModDefId};
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::{GenericParamKind, Node};
 use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
@@ -48,7 +48,7 @@ mod type_of;
 ///////////////////////////////////////////////////////////////////////////
 // Main entry point
 
-fn collect_mod_item_types(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
+fn collect_mod_item_types(tcx: TyCtxt<'_>, module_def_id: LocalModDefId) {
     tcx.hir().visit_item_likes_in_module(module_def_id, &mut CollectItemTypesVisitor { tcx });
 }
 

compiler/rustc_hir_analysis/src/impl_wf_check.rs

@@ -14,7 +14,7 @@ use min_specialization::check_min_specialization;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::struct_span_err;
 use rustc_hir::def::DefKind;
-use rustc_hir::def_id::LocalDefId;
+use rustc_hir::def_id::{LocalDefId, LocalModDefId};
 use rustc_middle::query::Providers;
 use rustc_middle::ty::{self, TyCtxt, TypeVisitableExt};
 use rustc_span::{Span, Symbol};
@@ -51,7 +51,7 @@ mod min_specialization;
 /// impl<'a> Trait<Foo> for Bar { type X = &'a i32; }
 /// //   ^ 'a is unused and appears in assoc type, error
 /// ```
-fn check_mod_impl_wf(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
+fn check_mod_impl_wf(tcx: TyCtxt<'_>, module_def_id: LocalModDefId) {
     let min_specialization = tcx.features().min_specialization;
     let module = tcx.hir_module_items(module_def_id);
     for id in module.items() {

compiler/rustc_lint/src/late.rs

@@ -19,7 +19,7 @@ use rustc_ast as ast;
 use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_data_structures::sync::join;
 use rustc_hir as hir;
-use rustc_hir::def_id::LocalDefId;
+use rustc_hir::def_id::{LocalDefId, LocalModDefId};
 use rustc_hir::intravisit as hir_visit;
 use rustc_hir::intravisit::Visitor;
 use rustc_middle::hir::nested_filter;
@@ -338,7 +338,7 @@ crate::late_lint_methods!(impl_late_lint_pass, []);
 
 pub fn late_lint_mod<'tcx, T: LateLintPass<'tcx> + 'tcx>(
     tcx: TyCtxt<'tcx>,
-    module_def_id: LocalDefId,
+    module_def_id: LocalModDefId,
     builtin_lints: T,
 ) {
     let context = LateContext {
@@ -369,7 +369,7 @@ pub fn late_lint_mod<'tcx, T: LateLintPass<'tcx> + 'tcx>(
 
 fn late_lint_mod_inner<'tcx, T: LateLintPass<'tcx>>(
     tcx: TyCtxt<'tcx>,
-    module_def_id: LocalDefId,
+    module_def_id: LocalModDefId,
     context: LateContext<'tcx>,
     pass: T,
 ) {

compiler/rustc_lint/src/lib.rs

@@ -90,7 +90,7 @@ use rustc_ast as ast;
 use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 use rustc_hir as hir;
-use rustc_hir::def_id::LocalDefId;
+use rustc_hir::def_id::{LocalDefId, LocalModDefId};
 use rustc_middle::query::Providers;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::lint::builtin::{
@@ -145,7 +145,7 @@ pub fn provide(providers: &mut Providers) {
     *providers = Providers { lint_mod, ..*providers };
 }
 
-fn lint_mod(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
+fn lint_mod(tcx: TyCtxt<'_>, module_def_id: LocalModDefId) {
     late_lint_mod(tcx, module_def_id, BuiltinCombinedModuleLateLintPass::new());
 }
 

compiler/rustc_middle/src/dep_graph/dep_node.rs

@@ -60,7 +60,7 @@ use crate::mir::mono::MonoItem;
 use crate::ty::TyCtxt;
 
 use rustc_data_structures::fingerprint::Fingerprint;
-use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, LOCAL_CRATE};
+use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, LocalModDefId, ModDefId, LOCAL_CRATE};
 use rustc_hir::definitions::DefPathHash;
 use rustc_hir::{HirId, ItemLocalId, OwnerId};
 use rustc_query_system::dep_graph::FingerprintStyle;
@@ -387,3 +387,53 @@ impl<'tcx> DepNodeParams<TyCtxt<'tcx>> for HirId {
         }
     }
 }
+
+macro_rules! impl_for_typed_def_id {
+    ($Name:ident, $LocalName:ident) => {
+        impl<'tcx> DepNodeParams<TyCtxt<'tcx>> for $Name {
+            #[inline(always)]
+            fn fingerprint_style() -> FingerprintStyle {
+                FingerprintStyle::DefPathHash
+            }
+
+            #[inline(always)]
+            fn to_fingerprint(&self, tcx: TyCtxt<'tcx>) -> Fingerprint {
+                self.to_def_id().to_fingerprint(tcx)
+            }
+
+            #[inline(always)]
+            fn to_debug_str(&self, tcx: TyCtxt<'tcx>) -> String {
+                self.to_def_id().to_debug_str(tcx)
+            }
+
+            #[inline(always)]
+            fn recover(tcx: TyCtxt<'tcx>, dep_node: &DepNode) -> Option<Self> {
+                DefId::recover(tcx, dep_node).map($Name::new_unchecked)
+            }
+        }
+
+        impl<'tcx> DepNodeParams<TyCtxt<'tcx>> for $LocalName {
+            #[inline(always)]
+            fn fingerprint_style() -> FingerprintStyle {
+                FingerprintStyle::DefPathHash
+            }
+
+            #[inline(always)]
+            fn to_fingerprint(&self, tcx: TyCtxt<'tcx>) -> Fingerprint {
+                self.to_def_id().to_fingerprint(tcx)
+            }
+
+            #[inline(always)]
+            fn to_debug_str(&self, tcx: TyCtxt<'tcx>) -> String {
+                self.to_def_id().to_debug_str(tcx)
+            }
+
+            #[inline(always)]
+            fn recover(tcx: TyCtxt<'tcx>, dep_node: &DepNode) -> Option<Self> {
+                LocalDefId::recover(tcx, dep_node).map($LocalName::new_unchecked)
+            }
+        }
+    };
+}
+
+impl_for_typed_def_id! { ModDefId, LocalModDefId }

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

@@ -8,7 +8,7 @@ use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::svh::Svh;
 use rustc_data_structures::sync::{par_for_each_in, DynSend, DynSync};
 use rustc_hir::def::{DefKind, Res};
-use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_ID, LOCAL_CRATE};
+use rustc_hir::def_id::{DefId, LocalDefId, LocalModDefId, LOCAL_CRATE};
 use rustc_hir::definitions::{DefKey, DefPath, DefPathData, DefPathHash};
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::*;
@@ -148,7 +148,7 @@ impl<'hir> Map<'hir> {
     }
 
     #[inline]
-    pub fn module_items(self, module: LocalDefId) -> impl Iterator<Item = ItemId> + 'hir {
+    pub fn module_items(self, module: LocalModDefId) -> impl Iterator<Item = ItemId> + 'hir {
         self.tcx.hir_module_items(module).items()
     }
 
@@ -169,8 +169,8 @@ impl<'hir> Map<'hir> {
     }
 
     #[inline]
-    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 local_def_id_to_hir_id(self, def_id: impl Into<LocalDefId>) -> HirId {
+        self.tcx.local_def_id_to_hir_id(def_id.into())
     }
 
     /// Do not call this function directly. The query should be called.
@@ -529,8 +529,8 @@ impl<'hir> Map<'hir> {
         self.krate_attrs().iter().any(|attr| attr.has_name(sym::rustc_coherence_is_core))
     }
 
-    pub fn get_module(self, module: LocalDefId) -> (&'hir Mod<'hir>, Span, HirId) {
-        let hir_id = HirId::make_owner(module);
+    pub fn get_module(self, module: LocalModDefId) -> (&'hir Mod<'hir>, Span, HirId) {
+        let hir_id = HirId::make_owner(module.to_local_def_id());
         match self.tcx.hir_owner(hir_id.owner).map(|o| o.node) {
             Some(OwnerNode::Item(&Item { span, kind: ItemKind::Mod(ref m), .. })) => {
                 (m, span, hir_id)
@@ -542,7 +542,7 @@ impl<'hir> Map<'hir> {
 
     /// Walks the contents of the local crate. See also `visit_all_item_likes_in_crate`.
     pub fn walk_toplevel_module(self, visitor: &mut impl Visitor<'hir>) {
-        let (top_mod, span, hir_id) = self.get_module(CRATE_DEF_ID);
+        let (top_mod, span, hir_id) = self.get_module(LocalModDefId::CRATE_DEF_ID);
         visitor.visit_mod(top_mod, span, hir_id);
     }
 
@@ -595,7 +595,7 @@ impl<'hir> Map<'hir> {
 
     /// This method is the equivalent of `visit_all_item_likes_in_crate` but restricted to
     /// item-likes in a single module.
-    pub fn visit_item_likes_in_module<V>(self, module: LocalDefId, visitor: &mut V)
+    pub fn visit_item_likes_in_module<V>(self, module: LocalModDefId, visitor: &mut V)
     where
         V: Visitor<'hir>,
     {
@@ -618,17 +618,19 @@ impl<'hir> Map<'hir> {
         }
     }
 
-    pub fn for_each_module(self, mut f: impl FnMut(LocalDefId)) {
+    pub fn for_each_module(self, mut f: impl FnMut(LocalModDefId)) {
         let crate_items = self.tcx.hir_crate_items(());
         for module in crate_items.submodules.iter() {
-            f(module.def_id)
+            f(LocalModDefId::new_unchecked(module.def_id))
         }
     }
 
     #[inline]
-    pub fn par_for_each_module(self, f: impl Fn(LocalDefId) + DynSend + DynSync) {
+    pub fn par_for_each_module(self, f: impl Fn(LocalModDefId) + DynSend + DynSync) {
         let crate_items = self.tcx.hir_crate_items(());
-        par_for_each_in(&crate_items.submodules[..], |module| f(module.def_id))
+        par_for_each_in(&crate_items.submodules[..], |module| {
+            f(LocalModDefId::new_unchecked(module.def_id))
+        })
     }
 
     /// Returns an iterator for the nodes in the ancestor tree of the `current_id`
@@ -1324,7 +1326,7 @@ fn hir_id_to_string(map: Map<'_>, id: HirId) -> String {
     }
 }
 
-pub(super) fn hir_module_items(tcx: TyCtxt<'_>, module_id: LocalDefId) -> ModuleItems {
+pub(super) fn hir_module_items(tcx: TyCtxt<'_>, module_id: LocalModDefId) -> ModuleItems {
     let mut collector = ItemCollector::new(tcx, false);
 
     let (hir_mod, span, hir_id) = tcx.hir().get_module(module_id);

compiler/rustc_middle/src/hir/mod.rs

@@ -11,7 +11,7 @@ use crate::ty::{EarlyBinder, ImplSubject, TyCtxt};
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::sync::{par_for_each_in, DynSend, DynSync};
 use rustc_hir::def::DefKind;
-use rustc_hir::def_id::{DefId, LocalDefId};
+use rustc_hir::def_id::{DefId, LocalDefId, LocalModDefId};
 use rustc_hir::*;
 use rustc_query_system::ich::StableHashingContext;
 use rustc_span::{ExpnId, DUMMY_SP};
@@ -101,22 +101,22 @@ impl<'tcx> TyCtxt<'tcx> {
         map::Map { tcx: self }
     }
 
-    pub fn parent_module(self, id: HirId) -> LocalDefId {
+    pub fn parent_module(self, id: HirId) -> LocalModDefId {
         if !id.is_owner() && self.def_kind(id.owner) == DefKind::Mod {
-            id.owner.def_id
+            LocalModDefId::new_unchecked(id.owner.def_id)
         } else {
             self.parent_module_from_def_id(id.owner.def_id)
         }
     }
 
-    pub fn parent_module_from_def_id(self, mut id: LocalDefId) -> LocalDefId {
+    pub fn parent_module_from_def_id(self, mut id: LocalDefId) -> LocalModDefId {
         while let Some(parent) = self.opt_local_parent(id) {
             id = parent;
             if self.def_kind(id) == DefKind::Mod {
                 break;
             }
         }
-        id
+        LocalModDefId::new_unchecked(id)
     }
 
     pub fn impl_subject(self, def_id: DefId) -> EarlyBinder<ImplSubject<'tcx>> {

compiler/rustc_middle/src/query/erase.rs

@@ -235,6 +235,7 @@ trivial! {
     rustc_hir::def_id::DefId,
     rustc_hir::def_id::DefIndex,
     rustc_hir::def_id::LocalDefId,
+    rustc_hir::def_id::LocalModDefId,
     rustc_hir::def::DefKind,
     rustc_hir::Defaultness,
     rustc_hir::definitions::DefKey,

compiler/rustc_middle/src/query/keys.rs

@@ -8,7 +8,7 @@ use crate::ty::fast_reject::SimplifiedType;
 use crate::ty::layout::{TyAndLayout, ValidityRequirement};
 use crate::ty::{self, Ty, TyCtxt};
 use crate::ty::{GenericArg, GenericArgsRef};
-use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, LOCAL_CRATE};
+use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, LocalModDefId, ModDefId, LOCAL_CRATE};
 use rustc_hir::hir_id::{HirId, OwnerId};
 use rustc_query_system::query::{DefaultCacheSelector, SingleCacheSelector, VecCacheSelector};
 use rustc_span::symbol::{Ident, Symbol};
@@ -175,6 +175,41 @@ impl AsLocalKey for DefId {
     }
 }
 
+impl Key for LocalModDefId {
+    type CacheSelector = DefaultCacheSelector<Self>;
+
+    fn default_span(&self, tcx: TyCtxt<'_>) -> Span {
+        tcx.def_span(*self)
+    }
+
+    #[inline(always)]
+    fn key_as_def_id(&self) -> Option<DefId> {
+        Some(self.to_def_id())
+    }
+}
+
+impl Key for ModDefId {
+    type CacheSelector = DefaultCacheSelector<Self>;
+
+    fn default_span(&self, tcx: TyCtxt<'_>) -> Span {
+        tcx.def_span(*self)
+    }
+
+    #[inline(always)]
+    fn key_as_def_id(&self) -> Option<DefId> {
+        Some(self.to_def_id())
+    }
+}
+
+impl AsLocalKey for ModDefId {
+    type LocalKey = LocalModDefId;
+
+    #[inline(always)]
+    fn as_local_key(&self) -> Option<Self::LocalKey> {
+        self.as_local()
+    }
+}
+
 impl Key for SimplifiedType {
     type CacheSelector = DefaultCacheSelector<Self>;