Auto merge of #85178 - cjgillot:local-crate, r=oli-obk

Remove CrateNum parameter for queries that only work on local crate

The pervasive `CrateNum` parameter is a remnant of the multi-crate rustc idea.

Using `()` as query key in those cases avoids having to worry about the validity of the query key.

7 files changed, 23 insertions, 47 deletions

diff --git a/compiler/rustc_passes/src/dead.rs b/compiler/rustc_passes/src/dead.rs
index bd142677cf9..bef56bbc287 100644
--- a/compiler/rustc_passes/src/dead.rs
+++ b/compiler/rustc_passes/src/dead.rs
@@ -5,7 +5,7 @@
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_hir as hir;
 use rustc_hir::def::{CtorOf, DefKind, Res};
-use rustc_hir::def_id::{DefId, LOCAL_CRATE};
+use rustc_hir::def_id::DefId;
 use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
 use rustc_hir::itemlikevisit::ItemLikeVisitor;
 use rustc_hir::{Node, PatKind, TyKind};
@@ -480,7 +480,7 @@ fn create_and_seed_worklist<'tcx>(
         )
         .chain(
             // Seed entry point
-            tcx.entry_fn(LOCAL_CRATE).and_then(|(def_id, _)| {
+            tcx.entry_fn(()).and_then(|(def_id, _)| {
                 def_id.as_local().map(|def_id| tcx.hir().local_def_id_to_hir_id(def_id))
             }),
         )
@@ -717,7 +717,7 @@ impl Visitor<'tcx> for DeadVisitor<'tcx> {
 }
 
 pub fn check_crate(tcx: TyCtxt<'_>) {
-    let access_levels = &tcx.privacy_access_levels(LOCAL_CRATE);
+    let access_levels = &tcx.privacy_access_levels(());
     let krate = tcx.hir().krate();
     let live_symbols = find_live(tcx, access_levels, krate);
     let mut visitor = DeadVisitor { tcx, live_symbols };
diff --git a/compiler/rustc_passes/src/diagnostic_items.rs b/compiler/rustc_passes/src/diagnostic_items.rs
index 8dd3700e5b6..f345d45d178 100644
--- a/compiler/rustc_passes/src/diagnostic_items.rs
+++ b/compiler/rustc_passes/src/diagnostic_items.rs
@@ -16,7 +16,7 @@ use rustc_hir::itemlikevisit::ItemLikeVisitor;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::Session;
-use rustc_span::def_id::{DefId, LocalDefId, LOCAL_CRATE};
+use rustc_span::def_id::{CrateNum, DefId, LocalDefId, LOCAL_CRATE};
 use rustc_span::symbol::{sym, Symbol};
 
 struct DiagnosticItemCollector<'tcx> {
@@ -99,7 +99,9 @@ fn extract(sess: &Session, attrs: &[ast::Attribute]) -> Option<Symbol> {
 }
 
 /// Traverse and collect the diagnostic items in the current
-fn collect<'tcx>(tcx: TyCtxt<'tcx>) -> FxHashMap<Symbol, DefId> {
+fn diagnostic_items<'tcx>(tcx: TyCtxt<'tcx>, cnum: CrateNum) -> FxHashMap<Symbol, DefId> {
+    assert_eq!(cnum, LOCAL_CRATE);
+
     // Initialize the collector.
     let mut collector = DiagnosticItemCollector::new(tcx);
 
@@ -114,7 +116,7 @@ fn collect<'tcx>(tcx: TyCtxt<'tcx>) -> FxHashMap<Symbol, DefId> {
 }
 
 /// Traverse and collect all the diagnostic items in all crates.
-fn collect_all<'tcx>(tcx: TyCtxt<'tcx>) -> FxHashMap<Symbol, DefId> {
+fn all_diagnostic_items<'tcx>(tcx: TyCtxt<'tcx>, (): ()) -> FxHashMap<Symbol, DefId> {
     // Initialize the collector.
     let mut collector = FxHashMap::default();
 
@@ -129,12 +131,6 @@ fn collect_all<'tcx>(tcx: TyCtxt<'tcx>) -> FxHashMap<Symbol, DefId> {
 }
 
 pub fn provide(providers: &mut Providers) {
-    providers.diagnostic_items = |tcx, id| {
-        assert_eq!(id, LOCAL_CRATE);
-        collect(tcx)
-    };
-    providers.all_diagnostic_items = |tcx, id| {
-        assert_eq!(id, LOCAL_CRATE);
-        collect_all(tcx)
-    };
+    providers.diagnostic_items = diagnostic_items;
+    providers.all_diagnostic_items = all_diagnostic_items;
 }
diff --git a/compiler/rustc_passes/src/entry.rs b/compiler/rustc_passes/src/entry.rs
index 65cfe986ad4..ca6a7561f3e 100644
--- a/compiler/rustc_passes/src/entry.rs
+++ b/compiler/rustc_passes/src/entry.rs
@@ -1,6 +1,6 @@
 use rustc_ast::entry::EntryPointType;
 use rustc_errors::struct_span_err;
-use rustc_hir::def_id::{CrateNum, DefId, CRATE_DEF_INDEX, LOCAL_CRATE};
+use rustc_hir::def_id::{DefId, CRATE_DEF_INDEX, LOCAL_CRATE};
 use rustc_hir::itemlikevisit::ItemLikeVisitor;
 use rustc_hir::{ForeignItem, HirId, ImplItem, Item, ItemKind, TraitItem, CRATE_HIR_ID};
 use rustc_middle::hir::map::Map;
@@ -48,9 +48,7 @@ impl<'a, 'tcx> ItemLikeVisitor<'tcx> for EntryContext<'a, 'tcx> {
     }
 }
 
-fn entry_fn(tcx: TyCtxt<'_>, cnum: CrateNum) -> Option<(DefId, EntryFnType)> {
-    assert_eq!(cnum, LOCAL_CRATE);
-
+fn entry_fn(tcx: TyCtxt<'_>, (): ()) -> Option<(DefId, EntryFnType)> {
     let any_exe = tcx.sess.crate_types().iter().any(|ty| *ty == CrateType::Executable);
     if !any_exe {
         // No need to find a main function.
@@ -227,10 +225,6 @@ fn no_main_err(tcx: TyCtxt<'_>, visitor: &EntryContext<'_, '_>) {
     err.emit();
 }
 
-pub fn find_entry_point(tcx: TyCtxt<'_>) -> Option<(DefId, EntryFnType)> {
-    tcx.entry_fn(LOCAL_CRATE)
-}
-
 pub fn provide(providers: &mut Providers) {
     *providers = Providers { entry_fn, ..*providers };
 }
diff --git a/compiler/rustc_passes/src/lang_items.rs b/compiler/rustc_passes/src/lang_items.rs
index 7e6bb9779f0..cfc18062d53 100644
--- a/compiler/rustc_passes/src/lang_items.rs
+++ b/compiler/rustc_passes/src/lang_items.rs
@@ -15,7 +15,7 @@ use rustc_middle::ty::TyCtxt;
 
 use rustc_errors::struct_span_err;
 use rustc_hir as hir;
-use rustc_hir::def_id::{DefId, LOCAL_CRATE};
+use rustc_hir::def_id::DefId;
 use rustc_hir::itemlikevisit::ItemLikeVisitor;
 use rustc_hir::lang_items::{extract, ITEM_REFS};
 use rustc_hir::{HirId, LangItem, LanguageItems, Target};
@@ -183,7 +183,7 @@ impl LanguageItemCollector<'tcx> {
 }
 
 /// Traverses and collects all the lang items in all crates.
-fn collect(tcx: TyCtxt<'_>) -> LanguageItems {
+fn get_lang_items(tcx: TyCtxt<'_>, (): ()) -> LanguageItems {
     // Initialize the collector.
     let mut collector = LanguageItemCollector::new(tcx);
 
@@ -207,8 +207,5 @@ fn collect(tcx: TyCtxt<'_>) -> LanguageItems {
 }
 
 pub fn provide(providers: &mut Providers) {
-    providers.get_lang_items = |tcx, id| {
-        assert_eq!(id, LOCAL_CRATE);
-        collect(tcx)
-    };
+    providers.get_lang_items = get_lang_items;
 }
diff --git a/compiler/rustc_passes/src/lib_features.rs b/compiler/rustc_passes/src/lib_features.rs
index 3dfe317a4bd..363a6417f99 100644
--- a/compiler/rustc_passes/src/lib_features.rs
+++ b/compiler/rustc_passes/src/lib_features.rs
@@ -6,7 +6,6 @@
 
 use rustc_ast::{Attribute, MetaItem, MetaItemKind};
 use rustc_errors::struct_span_err;
-use rustc_hir::def_id::LOCAL_CRATE;
 use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
 use rustc_middle::hir::map::Map;
 use rustc_middle::middle::lib_features::LibFeatures;
@@ -127,7 +126,7 @@ impl Visitor<'tcx> for LibFeatureCollector<'tcx> {
     }
 }
 
-fn collect(tcx: TyCtxt<'_>) -> LibFeatures {
+fn get_lib_features(tcx: TyCtxt<'_>, (): ()) -> LibFeatures {
     let mut collector = LibFeatureCollector::new(tcx);
     let krate = tcx.hir().krate();
     for attr in krate.non_exported_macro_attrs {
@@ -138,8 +137,5 @@ fn collect(tcx: TyCtxt<'_>) -> LibFeatures {
 }
 
 pub fn provide(providers: &mut Providers) {
-    providers.get_lib_features = |tcx, id| {
-        assert_eq!(id, LOCAL_CRATE);
-        collect(tcx)
-    };
+    providers.get_lib_features = get_lib_features;
 }
diff --git a/compiler/rustc_passes/src/reachable.rs b/compiler/rustc_passes/src/reachable.rs
index ec47f597257..0b3227abb5f 100644
--- a/compiler/rustc_passes/src/reachable.rs
+++ b/compiler/rustc_passes/src/reachable.rs
@@ -8,8 +8,7 @@
 use rustc_data_structures::fx::FxHashSet;
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
-use rustc_hir::def_id::LOCAL_CRATE;
-use rustc_hir::def_id::{CrateNum, DefId, LocalDefId};
+use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
 use rustc_hir::itemlikevisit::ItemLikeVisitor;
 use rustc_hir::Node;
@@ -385,10 +384,8 @@ impl<'a, 'tcx> ItemLikeVisitor<'tcx> for CollectPrivateImplItemsVisitor<'a, 'tcx
     }
 }
 
-fn reachable_set<'tcx>(tcx: TyCtxt<'tcx>, crate_num: CrateNum) -> FxHashSet<LocalDefId> {
-    debug_assert!(crate_num == LOCAL_CRATE);
-
-    let access_levels = &tcx.privacy_access_levels(LOCAL_CRATE);
+fn reachable_set<'tcx>(tcx: TyCtxt<'tcx>, (): ()) -> FxHashSet<LocalDefId> {
+    let access_levels = &tcx.privacy_access_levels(());
 
     let any_library =
         tcx.sess.crate_types().iter().any(|ty| {
diff --git a/compiler/rustc_passes/src/stability.rs b/compiler/rustc_passes/src/stability.rs
index 6b1813fba76..f41e0e03706 100644
--- a/compiler/rustc_passes/src/stability.rs
+++ b/compiler/rustc_passes/src/stability.rs
@@ -629,7 +629,7 @@ impl<'tcx> Visitor<'tcx> for MissingStabilityAnnotations<'tcx> {
     // stable (assuming they have not inherited instability from their parent).
 }
 
-fn new_index(tcx: TyCtxt<'tcx>) -> Index<'tcx> {
+fn stability_index(tcx: TyCtxt<'tcx>, (): ()) -> Index<'tcx> {
     let is_staged_api =
         tcx.sess.opts.debugging_opts.force_unstable_if_unmarked || tcx.features().staged_api;
     let mut staged_api = FxHashMap::default();
@@ -704,11 +704,7 @@ fn check_mod_unstable_api_usage(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
 }
 
 pub(crate) fn provide(providers: &mut Providers) {
-    *providers = Providers { check_mod_unstable_api_usage, ..*providers };
-    providers.stability_index = |tcx, cnum| {
-        assert_eq!(cnum, LOCAL_CRATE);
-        new_index(tcx)
-    };
+    *providers = Providers { check_mod_unstable_api_usage, stability_index, ..*providers };
 }
 
 struct Checker<'tcx> {
@@ -880,7 +876,7 @@ impl Visitor<'tcx> for CheckTraitImplStable<'tcx> {
 /// were expected to be library features), and the list of features used from
 /// libraries, identify activated features that don't exist and error about them.
 pub fn check_unused_or_stable_features(tcx: TyCtxt<'_>) {
-    let access_levels = &tcx.privacy_access_levels(LOCAL_CRATE);
+    let access_levels = &tcx.privacy_access_levels(());
 
     if tcx.stability().staged_api[&LOCAL_CRATE] {
         let krate = tcx.hir().krate();