LocalCrate key

compiler/rustc_codegen_ssa/src/back/symbol_export.rs

@@ -10,6 +10,7 @@ use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
 use rustc_middle::middle::exported_symbols::{
     metadata_symbol_name, ExportedSymbol, SymbolExportInfo, SymbolExportKind, SymbolExportLevel,
 };
+use rustc_middle::query::LocalCrate;
 use rustc_middle::ty::query::{ExternProviders, Providers};
 use rustc_middle::ty::subst::{GenericArgKind, SubstsRef};
 use rustc_middle::ty::Instance;
@@ -41,7 +42,7 @@ pub fn crates_export_threshold(crate_types: &[CrateType]) -> SymbolExportLevel {
     }
 }
 
-fn reachable_non_generics_provider(tcx: TyCtxt<'_>, (): ()) -> DefIdMap<SymbolExportInfo> {
+fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<SymbolExportInfo> {
     if !tcx.sess.opts.output_types.should_codegen() {
         return Default::default();
     }
@@ -168,7 +169,7 @@ fn is_reachable_non_generic_provider_extern(tcx: TyCtxt<'_>, def_id: DefId) -> b
 
 fn exported_symbols_provider_local(
     tcx: TyCtxt<'_>,
-    (): (),
+    _: LocalCrate,
 ) -> &[(ExportedSymbol<'_>, SymbolExportInfo)] {
     if !tcx.sess.opts.output_types.should_codegen() {
         return &[];

compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs

@@ -13,6 +13,7 @@ use rustc_middle::arena::ArenaAllocatable;
 use rustc_middle::metadata::ModChild;
 use rustc_middle::middle::exported_symbols::ExportedSymbol;
 use rustc_middle::middle::stability::DeprecationEntry;
+use rustc_middle::query::LocalCrate;
 use rustc_middle::ty::fast_reject::SimplifiedType;
 use rustc_middle::ty::query::{ExternProviders, Providers};
 use rustc_middle::ty::{self, TyCtxt};
@@ -367,7 +368,7 @@ pub(in crate::rmeta) fn provide(providers: &mut Providers) {
     *providers = Providers {
         allocator_kind: |tcx, ()| CStore::from_tcx(tcx).allocator_kind(),
         alloc_error_handler_kind: |tcx, ()| CStore::from_tcx(tcx).alloc_error_handler_kind(),
-        is_private_dep: |_tcx, ()| false,
+        is_private_dep: |_tcx, LocalCrate| false,
         native_library: |tcx, id| {
             tcx.native_libraries(id.krate)
                 .iter()
@@ -383,8 +384,8 @@ pub(in crate::rmeta) fn provide(providers: &mut Providers) {
                         .contains(&id)
                 })
         },
-        native_libraries: |tcx, ()| native_libs::collect(tcx),
-        foreign_modules: |tcx, ()| {
+        native_libraries: |tcx, LocalCrate| native_libs::collect(tcx),
+        foreign_modules: |tcx, LocalCrate| {
             foreign_modules::collect(tcx).into_iter().map(|m| (m.def_id, m)).collect()
         },
 
@@ -482,8 +483,8 @@ pub(in crate::rmeta) fn provide(providers: &mut Providers) {
         },
 
         dependency_formats: |tcx, ()| Lrc::new(crate::dependency_format::calculate(tcx)),
-        has_global_allocator: |tcx, ()| CStore::from_tcx(tcx).has_global_allocator(),
-        has_alloc_error_handler: |tcx, ()| CStore::from_tcx(tcx).has_alloc_error_handler(),
+        has_global_allocator: |tcx, LocalCrate| CStore::from_tcx(tcx).has_global_allocator(),
+        has_alloc_error_handler: |tcx, LocalCrate| CStore::from_tcx(tcx).has_alloc_error_handler(),
         postorder_cnums: |tcx, ()| {
             tcx.arena
                 .alloc_slice(&CStore::from_tcx(tcx).crate_dependencies_in_postorder(LOCAL_CRATE))

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -24,6 +24,7 @@ use rustc_middle::middle::exported_symbols::{
     metadata_symbol_name, ExportedSymbol, SymbolExportInfo,
 };
 use rustc_middle::mir::interpret;
+use rustc_middle::query::LocalCrate;
 use rustc_middle::traits::specialization_graph;
 use rustc_middle::ty::codec::TyEncoder;
 use rustc_middle::ty::fast_reject::{self, SimplifiedType, TreatParams, TreatProjections};
@@ -2240,7 +2241,7 @@ pub fn provide(providers: &mut Providers) {
                 .get(&def_id)
                 .expect("no traits in scope for a doc link")
         },
-        traits_in_crate: |tcx, ()| {
+        traits_in_crate: |tcx, LocalCrate| {
             let mut traits = Vec::new();
             for id in tcx.hir().items() {
                 if matches!(tcx.def_kind(id.owner_id), DefKind::Trait | DefKind::TraitAlias) {
@@ -2252,7 +2253,7 @@ pub fn provide(providers: &mut Providers) {
             traits.sort_by_cached_key(|&def_id| tcx.def_path_hash(def_id));
             tcx.arena.alloc_slice(&traits)
         },
-        trait_impls_in_crate: |tcx, ()| {
+        trait_impls_in_crate: |tcx, LocalCrate| {
             let mut trait_impls = Vec::new();
             for id in tcx.hir().items() {
                 if matches!(tcx.def_kind(id.owner_id), DefKind::Impl { .. })

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

@@ -1,4 +1,5 @@
 use crate::hir::{ModuleItems, Owner};
+use crate::query::LocalCrate;
 use crate::ty::TyCtxt;
 use rustc_ast as ast;
 use rustc_data_structures::fingerprint::Fingerprint;
@@ -1131,7 +1132,7 @@ impl<'hir> intravisit::Map<'hir> for Map<'hir> {
     }
 }
 
-pub(super) fn crate_hash(tcx: TyCtxt<'_>, (): ()) -> Svh {
+pub(super) fn crate_hash(tcx: TyCtxt<'_>, _: LocalCrate) -> Svh {
     let krate = tcx.hir_crate(());
     let hir_body_hash = krate.opt_hir_hash.expect("HIR hash missing while computing crate hash");
 

compiler/rustc_middle/src/query/keys.rs

@@ -13,6 +13,10 @@ use rustc_query_system::query::{DefaultCacheSelector, SingleCacheSelector, VecCa
 use rustc_span::symbol::{Ident, Symbol};
 use rustc_span::{Span, DUMMY_SP};
 
+/// Placeholder for `CrateNum`'s "local" counterpart
+#[derive(Copy, Clone, Debug)]
+pub struct LocalCrate;
+
 /// The `Key` trait controls what types can legally be used as the key
 /// for a query.
 pub trait Key: Sized {
@@ -115,11 +119,11 @@ impl Key for CrateNum {
 }
 
 impl AsLocalKey for CrateNum {
-    type LocalKey = ();
+    type LocalKey = LocalCrate;
 
     #[inline(always)]
     fn as_local_key(&self) -> Option<Self::LocalKey> {
-        (*self == LOCAL_CRATE).then_some(())
+        (*self == LOCAL_CRATE).then_some(LocalCrate)
     }
 }
 

compiler/rustc_middle/src/query/mod.rs

@@ -8,7 +8,7 @@ use crate::ty::{self, print::describe_as_module, TyCtxt};
 use rustc_span::def_id::LOCAL_CRATE;
 
 mod keys;
-pub use keys::{AsLocalKey, Key};
+pub use keys::{AsLocalKey, Key, LocalCrate};
 
 // Each of these queries corresponds to a function pointer field in the
 // `Providers` struct for requesting a value of that type, and a method

compiler/rustc_middle/src/ty/context.rs

@@ -15,6 +15,7 @@ use crate::mir::interpret::{self, Allocation, ConstAllocation};
 use crate::mir::{
     Body, BorrowCheckResult, Field, Local, Place, PlaceElem, ProjectionKind, Promoted,
 };
+use crate::query::LocalCrate;
 use crate::thir::Thir;
 use crate::traits;
 use crate::traits::solve;
@@ -2519,10 +2520,10 @@ pub fn provide(providers: &mut ty::query::Providers) {
     providers.extern_mod_stmt_cnum =
         |tcx, id| tcx.resolutions(()).extern_crate_map.get(&id).cloned();
     providers.is_panic_runtime =
-        |tcx, ()| tcx.sess.contains_name(tcx.hir().krate_attrs(), sym::panic_runtime);
+        |tcx, LocalCrate| tcx.sess.contains_name(tcx.hir().krate_attrs(), sym::panic_runtime);
     providers.is_compiler_builtins =
-        |tcx, ()| tcx.sess.contains_name(tcx.hir().krate_attrs(), sym::compiler_builtins);
-    providers.has_panic_handler = |tcx, ()| {
+        |tcx, LocalCrate| tcx.sess.contains_name(tcx.hir().krate_attrs(), sym::compiler_builtins);
+    providers.has_panic_handler = |tcx, LocalCrate| {
         // 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())
     };

compiler/rustc_mir_transform/src/ffi_unwind_calls.rs

@@ -1,5 +1,6 @@
 use rustc_hir::def_id::{LocalDefId, LOCAL_CRATE};
 use rustc_middle::mir::*;
+use rustc_middle::query::LocalCrate;
 use rustc_middle::ty::layout;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::{self, TyCtxt};
@@ -121,7 +122,7 @@ fn has_ffi_unwind_calls(tcx: TyCtxt<'_>, local_def_id: LocalDefId) -> bool {
     tainted
 }
 
-fn required_panic_strategy(tcx: TyCtxt<'_>, (): ()) -> Option<PanicStrategy> {
+fn required_panic_strategy(tcx: TyCtxt<'_>, _: LocalCrate) -> Option<PanicStrategy> {
     if tcx.is_panic_runtime(LOCAL_CRATE) {
         return Some(tcx.sess.panic_strategy());
     }

compiler/rustc_passes/src/debugger_visualizer.rs

@@ -5,8 +5,8 @@ use rustc_data_structures::fx::FxHashSet;
 use rustc_expand::base::resolve_path;
 use rustc_hir as hir;
 use rustc_hir::HirId;
-use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::TyCtxt;
+use rustc_middle::{query::LocalCrate, ty::query::Providers};
 use rustc_span::{sym, DebuggerVisualizerFile, DebuggerVisualizerType};
 
 use std::sync::Arc;
@@ -67,7 +67,7 @@ fn check_for_debugger_visualizer(
 }
 
 /// Traverses and collects the debugger visualizers for a specific crate.
-fn debugger_visualizers(tcx: TyCtxt<'_>, (): ()) -> Vec<DebuggerVisualizerFile> {
+fn debugger_visualizers(tcx: TyCtxt<'_>, _: LocalCrate) -> Vec<DebuggerVisualizerFile> {
     // Initialize the collector.
     let mut debugger_visualizers = FxHashSet::default();
 

compiler/rustc_passes/src/diagnostic_items.rs

@@ -12,6 +12,7 @@
 use rustc_ast as ast;
 use rustc_hir::diagnostic_items::DiagnosticItems;
 use rustc_hir::OwnerId;
+use rustc_middle::query::LocalCrate;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::TyCtxt;
 use rustc_span::def_id::{DefId, LOCAL_CRATE};
@@ -62,7 +63,7 @@ fn extract(attrs: &[ast::Attribute]) -> Option<Symbol> {
 }
 
 /// Traverse and collect the diagnostic items in the current
-fn diagnostic_items(tcx: TyCtxt<'_>, (): ()) -> DiagnosticItems {
+fn diagnostic_items(tcx: TyCtxt<'_>, _: LocalCrate) -> DiagnosticItems {
     // Initialize the collector.
     let mut diagnostic_items = DiagnosticItems::default();
 

src/tools/miri/src/bin/miri.rs

@@ -29,6 +29,7 @@ use rustc_middle::{
         ExportedSymbol, SymbolExportInfo, SymbolExportKind, SymbolExportLevel,
     },
     ty::{query::ExternProviders, TyCtxt},
+    query::LocalCrate,
 };
 use rustc_session::{config::CrateType, search_paths::PathKind, CtfeBacktrace};
 
@@ -107,7 +108,7 @@ impl rustc_driver::Callbacks for MiriBeRustCompilerCalls {
             config.override_queries = Some(|_, local_providers, _| {
                 // `exported_symbols` and `reachable_non_generics` provided by rustc always returns
                 // an empty result if `tcx.sess.opts.output_types.should_codegen()` is false.
-                local_providers.exported_symbols = |tcx, ()| {
+                local_providers.exported_symbols = |tcx, LocalCrate| {
                     let reachable_set = tcx.with_stable_hashing_context(|hcx| {
                         tcx.reachable_set(()).to_sorted(&hcx, true)
                     });