Use () for codegen queries.

compiler/rustc_codegen_cranelift/src/driver/aot.rs

@@ -41,7 +41,7 @@ fn emit_module(
 
     unwind_context.emit(&mut product);
 
-    let tmp_file = tcx.output_filenames(LOCAL_CRATE).temp_path(OutputType::Object, Some(&name));
+    let tmp_file = tcx.output_filenames(()).temp_path(OutputType::Object, Some(&name));
     let obj = product.object.write().unwrap();
     if let Err(err) = std::fs::write(&tmp_file, obj) {
         tcx.sess.fatal(&format!("error writing object file: {}", err));
@@ -73,7 +73,7 @@ fn reuse_workproduct_for_cgu(
     let work_product = cgu.work_product(tcx);
     if let Some(saved_file) = &work_product.saved_file {
         let obj_out = tcx
-            .output_filenames(LOCAL_CRATE)
+            .output_filenames(())
             .temp_path(OutputType::Object, Some(&cgu.name().as_str()));
         object = Some(obj_out.clone());
         let source_file = rustc_incremental::in_incr_comp_dir(&incr_comp_session_dir, &saved_file);
@@ -179,7 +179,7 @@ pub(crate) fn run_aot(
     let mut work_products = FxHashMap::default();
 
     let cgus = if tcx.sess.opts.output_types.should_codegen() {
-        tcx.collect_and_partition_mono_items(LOCAL_CRATE).1
+        tcx.collect_and_partition_mono_items(()).1
     } else {
         // If only `--emit metadata` is used, we shouldn't perform any codegen.
         // Also `tcx.collect_and_partition_mono_items` may panic in that case.
@@ -265,7 +265,7 @@ pub(crate) fn run_aot(
                 .to_string();
 
             let tmp_file = tcx
-                .output_filenames(LOCAL_CRATE)
+                .output_filenames(())
                 .temp_path(OutputType::Metadata, Some(&metadata_cgu_name));
 
             let obj = crate::backend::with_object(tcx.sess, &metadata_cgu_name, |object| {
@@ -342,7 +342,7 @@ fn codegen_global_asm(tcx: TyCtxt<'_>, cgu_name: &str, global_asm: &str) {
         .join("\n");
 
     let output_object_file =
-        tcx.output_filenames(LOCAL_CRATE).temp_path(OutputType::Object, Some(cgu_name));
+        tcx.output_filenames(()).temp_path(OutputType::Object, Some(cgu_name));
 
     // Assemble `global_asm`
     let global_asm_object_file = add_file_stem_postfix(output_object_file.clone(), ".asm");

compiler/rustc_codegen_cranelift/src/driver/jit.rs

@@ -8,7 +8,6 @@ use std::os::raw::{c_char, c_int};
 use cranelift_codegen::binemit::{NullStackMapSink, NullTrapSink};
 use rustc_codegen_ssa::CrateInfo;
 use rustc_middle::mir::mono::MonoItem;
-use rustc_session::config::EntryFnType;
 
 use cranelift_jit::{JITBuilder, JITModule};
 
@@ -66,7 +65,7 @@ pub(crate) fn run_jit(tcx: TyCtxt<'_>, backend_config: BackendConfig) -> ! {
         matches!(backend_config.codegen_mode, CodegenMode::JitLazy),
     );
 
-    let (_, cgus) = tcx.collect_and_partition_mono_items(LOCAL_CRATE);
+    let (_, cgus) = tcx.collect_and_partition_mono_items(());
     let mono_items = cgus
         .iter()
         .map(|cgu| cgu.items_in_deterministic_order(tcx).into_iter())

compiler/rustc_codegen_cranelift/src/pretty_clif.rs

@@ -214,7 +214,7 @@ pub(crate) fn write_ir_file(
         return;
     }
 
-    let clif_output_dir = tcx.output_filenames(LOCAL_CRATE).with_extension("clif");
+    let clif_output_dir = tcx.output_filenames(()).with_extension("clif");
 
     match std::fs::create_dir(&clif_output_dir) {
         Ok(()) => {}

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -20,7 +20,6 @@ use rustc_codegen_ssa::{CompiledModule, ModuleCodegen};
 use rustc_data_structures::small_c_str::SmallCStr;
 use rustc_errors::{FatalError, Handler, Level};
 use rustc_fs_util::{link_or_copy, path_to_c_string};
-use rustc_hir::def_id::LOCAL_CRATE;
 use rustc_middle::bug;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::config::{self, Lto, OutputType, Passes, SwitchWithOptPath};
@@ -92,13 +91,12 @@ pub fn create_informational_target_machine(sess: &Session) -> &'static mut llvm:
 
 pub fn create_target_machine(tcx: TyCtxt<'_>, mod_name: &str) -> &'static mut llvm::TargetMachine {
     let split_dwarf_file = if tcx.sess.target_can_use_split_dwarf() {
-        tcx.output_filenames(LOCAL_CRATE)
-            .split_dwarf_path(tcx.sess.split_debuginfo(), Some(mod_name))
+        tcx.output_filenames(()).split_dwarf_path(tcx.sess.split_debuginfo(), Some(mod_name))
     } else {
         None
     };
     let config = TargetMachineFactoryConfig { split_dwarf_file };
-    target_machine_factory(&tcx.sess, tcx.backend_optimization_level(LOCAL_CRATE))(config)
+    target_machine_factory(&tcx.sess, tcx.backend_optimization_level(()))(config)
         .unwrap_or_else(|err| llvm_err(tcx.sess.diagnostic(), &err).raise())
 }
 

compiler/rustc_codegen_llvm/src/coverageinfo/mapgen.rs

@@ -6,7 +6,7 @@ use llvm::coverageinfo::CounterMappingRegion;
 use rustc_codegen_ssa::coverageinfo::map::{Counter, CounterExpression};
 use rustc_codegen_ssa::traits::{ConstMethods, CoverageInfoMethods};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexSet};
-use rustc_hir::def_id::{DefId, DefIdSet, LOCAL_CRATE};
+use rustc_hir::def_id::{DefId, DefIdSet};
 use rustc_llvm::RustString;
 use rustc_middle::mir::coverage::CodeRegion;
 use rustc_span::Symbol;
@@ -276,7 +276,7 @@ fn add_unused_functions<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>) {
         })
         .collect();
 
-    let codegenned_def_ids = tcx.codegened_and_inlined_items(LOCAL_CRATE);
+    let codegenned_def_ids = tcx.codegened_and_inlined_items(());
 
     let mut unused_def_ids_by_file: FxHashMap<Symbol, Vec<DefId>> = FxHashMap::default();
     for &non_codegenned_def_id in all_def_ids.difference(codegenned_def_ids) {

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

@@ -995,9 +995,10 @@ pub fn compile_unit_metadata(
     let name_in_debuginfo = name_in_debuginfo.to_string_lossy();
     let work_dir = tcx.sess.working_dir.0.to_string_lossy();
     let flags = "\0";
-    let out_dir = &tcx.output_filenames(LOCAL_CRATE).out_directory;
+    let output_filenames = tcx.output_filenames(());
+    let out_dir = &output_filenames.out_directory;
     let split_name = if tcx.sess.target_can_use_split_dwarf() {
-        tcx.output_filenames(LOCAL_CRATE)
+        output_filenames
             .split_dwarf_path(tcx.sess.split_debuginfo(), Some(codegen_unit_name))
             .map(|f| out_dir.join(f))
     } else {
@@ -1058,15 +1059,12 @@ pub fn compile_unit_metadata(
         if tcx.sess.opts.debugging_opts.profile {
             let cu_desc_metadata =
                 llvm::LLVMRustMetadataAsValue(debug_context.llcontext, unit_metadata);
-            let default_gcda_path = &tcx.output_filenames(LOCAL_CRATE).with_extension("gcda");
+            let default_gcda_path = &output_filenames.with_extension("gcda");
             let gcda_path =
                 tcx.sess.opts.debugging_opts.profile_emit.as_ref().unwrap_or(default_gcda_path);
 
             let gcov_cu_info = [
-                path_to_mdstring(
-                    debug_context.llcontext,
-                    &tcx.output_filenames(LOCAL_CRATE).with_extension("gcno"),
-                ),
+                path_to_mdstring(debug_context.llcontext, &output_filenames.with_extension("gcno")),
                 path_to_mdstring(debug_context.llcontext, &gcda_path),
                 cu_desc_metadata,
             ];

compiler/rustc_codegen_ssa/src/back/symbol_export.rs

@@ -230,7 +230,7 @@ fn exported_symbols_provider_local(
         // external linkage is enough for monomorphization to be linked to.
         let need_visibility = tcx.sess.target.dynamic_linking && !tcx.sess.target.only_cdylib;
 
-        let (_, cgus) = tcx.collect_and_partition_mono_items(LOCAL_CRATE);
+        let (_, cgus) = tcx.collect_and_partition_mono_items(());
 
         for (mono_item, &(linkage, visibility)) in cgus.iter().flat_map(|cgu| cgu.items().iter()) {
             if linkage != Linkage::External {
@@ -275,10 +275,8 @@ fn exported_symbols_provider_local(
 
 fn upstream_monomorphizations_provider(
     tcx: TyCtxt<'_>,
-    cnum: CrateNum,
+    (): (),
 ) -> DefIdMap<FxHashMap<SubstsRef<'_>, CrateNum>> {
-    debug_assert!(cnum == LOCAL_CRATE);
-
     let cnums = tcx.all_crate_nums(());
 
     let mut instances: DefIdMap<FxHashMap<_, _>> = Default::default();
@@ -341,7 +339,7 @@ fn upstream_monomorphizations_for_provider(
     def_id: DefId,
 ) -> Option<&FxHashMap<SubstsRef<'_>, CrateNum>> {
     debug_assert!(!def_id.is_local());
-    tcx.upstream_monomorphizations(LOCAL_CRATE).get(&def_id)
+    tcx.upstream_monomorphizations(()).get(&def_id)
 }
 
 fn upstream_drop_glue_for_provider<'tcx>(

compiler/rustc_codegen_ssa/src/back/write.rs

@@ -482,7 +482,7 @@ pub fn start_async_codegen<B: ExtraBackendMethods>(
         codegen_worker_receive,
         shared_emitter_main,
         future: coordinator_thread,
-        output_filenames: tcx.output_filenames(LOCAL_CRATE),
+        output_filenames: tcx.output_filenames(()),
     }
 }
 
@@ -1042,7 +1042,7 @@ fn start_executing_work<B: ExtraBackendMethods>(
         // If we know that we won’t be doing codegen, create target machines without optimisation.
         config::OptLevel::No
     } else {
-        tcx.backend_optimization_level(LOCAL_CRATE)
+        tcx.backend_optimization_level(())
     };
     let cgcx = CodegenContext::<B> {
         backend: backend.clone(),
@@ -1061,7 +1061,7 @@ fn start_executing_work<B: ExtraBackendMethods>(
         cgu_reuse_tracker: sess.cgu_reuse_tracker.clone(),
         coordinator_send,
         diag_emitter: shared_emitter.clone(),
-        output_filenames: tcx.output_filenames(LOCAL_CRATE),
+        output_filenames: tcx.output_filenames(()),
         regular_module_config: regular_config,
         metadata_module_config: metadata_config,
         allocator_module_config: allocator_config,

compiler/rustc_codegen_ssa/src/base.rs

@@ -485,7 +485,7 @@ pub fn codegen_crate<B: ExtraBackendMethods>(
 
     // Run the monomorphization collector and partition the collected items into
     // codegen units.
-    let codegen_units = tcx.collect_and_partition_mono_items(LOCAL_CRATE).1;
+    let codegen_units = tcx.collect_and_partition_mono_items(()).1;
 
     // Force all codegen_unit queries so they are already either red or green
     // when compile_codegen_unit accesses them. We are not able to re-execute

compiler/rustc_incremental/src/assert_module_sources.rs

@@ -36,7 +36,7 @@ pub fn assert_module_sources(tcx: TyCtxt<'_>) {
         }
 
         let available_cgus = tcx
-            .collect_and_partition_mono_items(LOCAL_CRATE)
+            .collect_and_partition_mono_items(())
             .1
             .iter()
             .map(|cgu| cgu.name().to_string())

compiler/rustc_middle/src/query/mod.rs

@@ -1150,11 +1150,9 @@ rustc_queries! {
     /// added or removed in any upstream crate. Instead use the narrower
     /// `upstream_monomorphizations_for`, `upstream_drop_glue_for`, or, even
     /// better, `Instance::upstream_monomorphization()`.
-    query upstream_monomorphizations(
-        k: CrateNum
-    ) -> DefIdMap<FxHashMap<SubstsRef<'tcx>, CrateNum>> {
+    query upstream_monomorphizations(_: ()) -> DefIdMap<FxHashMap<SubstsRef<'tcx>, CrateNum>> {
         storage(ArenaCacheSelector<'tcx>)
-        desc { "collecting available upstream monomorphizations `{:?}`", k }
+        desc { "collecting available upstream monomorphizations" }
     }
 
     /// Returns the set of upstream monomorphizations available for the
@@ -1434,8 +1432,7 @@ rustc_queries! {
         desc { "exported_symbols" }
     }
 
-    query collect_and_partition_mono_items(_: CrateNum)
-        -> (&'tcx DefIdSet, &'tcx [CodegenUnit<'tcx>]) {
+    query collect_and_partition_mono_items(_: ()) -> (&'tcx DefIdSet, &'tcx [CodegenUnit<'tcx>]) {
         eval_always
         desc { "collect_and_partition_mono_items" }
     }
@@ -1444,8 +1441,7 @@ rustc_queries! {
     }
 
     /// All items participating in code generation together with items inlined into them.
-    query codegened_and_inlined_items(_: CrateNum)
-        -> &'tcx DefIdSet {
+    query codegened_and_inlined_items(_: ()) -> &'tcx DefIdSet {
         eval_always
        desc { "codegened_and_inlined_items" }
     }
@@ -1460,11 +1456,11 @@ rustc_queries! {
                 tcx.def_path_str(key)
         }
     }
-    query backend_optimization_level(_: CrateNum) -> OptLevel {
+    query backend_optimization_level(_: ()) -> OptLevel {
         desc { "optimization level used by backend" }
     }
 
-    query output_filenames(_: CrateNum) -> Arc<OutputFilenames> {
+    query output_filenames(_: ()) -> Arc<OutputFilenames> {
         eval_always
         desc { "output_filenames" }
     }

compiler/rustc_middle/src/ty/context.rs

@@ -2816,10 +2816,7 @@ pub fn provide(providers: &mut ty::query::Providers) {
     };
     providers.extern_mod_stmt_cnum = |tcx, id| tcx.extern_crate_map.get(&id).cloned();
     providers.all_crate_nums = |tcx, ()| tcx.arena.alloc_slice(&tcx.cstore.crates_untracked());
-    providers.output_filenames = |tcx, cnum| {
-        assert_eq!(cnum, LOCAL_CRATE);
-        tcx.output_filenames.clone()
-    };
+    providers.output_filenames = |tcx, ()| tcx.output_filenames.clone();
     providers.features_query = |tcx, ()| tcx.sess.features_untracked();
     providers.is_panic_runtime = |tcx, cnum| {
         assert_eq!(cnum, LOCAL_CRATE);

compiler/rustc_mir/src/monomorphize/collector.rs

@@ -184,7 +184,7 @@ use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync::{par_iter, MTLock, MTRef, ParallelIterator};
 use rustc_errors::{ErrorReported, FatalError};
 use rustc_hir as hir;
-use rustc_hir::def_id::{DefId, DefIdMap, LocalDefId, LOCAL_CRATE};
+use rustc_hir::def_id::{DefId, DefIdMap, LocalDefId};
 use rustc_hir::itemlikevisit::ItemLikeVisitor;
 use rustc_hir::lang_items::LangItem;
 use rustc_index::bit_set::GrowableBitSet;
@@ -452,7 +452,7 @@ fn shrunk_instance_name(
             after = &s[positions().rev().nth(after).unwrap_or(0)..],
         );
 
-        let path = tcx.output_filenames(LOCAL_CRATE).temp_path_ext("long-type.txt", None);
+        let path = tcx.output_filenames(()).temp_path_ext("long-type.txt", None);
         let written_to_path = std::fs::write(&path, s).ok().map(|_| path);
 
         (shrunk, written_to_path)

compiler/rustc_mir/src/monomorphize/partitioning/mod.rs

@@ -97,7 +97,7 @@ mod merging;
 
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync;
-use rustc_hir::def_id::{CrateNum, DefIdSet, LOCAL_CRATE};
+use rustc_hir::def_id::DefIdSet;
 use rustc_middle::mir::mono::MonoItem;
 use rustc_middle::mir::mono::{CodegenUnit, Linkage};
 use rustc_middle::ty::print::with_no_trimmed_paths;
@@ -311,10 +311,8 @@ where
 
 fn collect_and_partition_mono_items<'tcx>(
     tcx: TyCtxt<'tcx>,
-    cnum: CrateNum,
+    (): (),
 ) -> (&'tcx DefIdSet, &'tcx [CodegenUnit<'tcx>]) {
-    assert_eq!(cnum, LOCAL_CRATE);
-
     let collection_mode = match tcx.sess.opts.debugging_opts.print_mono_items {
         Some(ref s) => {
             let mode_string = s.to_lowercase();
@@ -426,8 +424,8 @@ fn collect_and_partition_mono_items<'tcx>(
     (tcx.arena.alloc(mono_items), codegen_units)
 }
 
-fn codegened_and_inlined_items<'tcx>(tcx: TyCtxt<'tcx>, cnum: CrateNum) -> &'tcx DefIdSet {
-    let (items, cgus) = tcx.collect_and_partition_mono_items(cnum);
+fn codegened_and_inlined_items<'tcx>(tcx: TyCtxt<'tcx>, (): ()) -> &'tcx DefIdSet {
+    let (items, cgus) = tcx.collect_and_partition_mono_items(());
     let mut visited = DefIdSet::default();
     let mut result = items.clone();
 
@@ -455,12 +453,12 @@ pub fn provide(providers: &mut Providers) {
     providers.codegened_and_inlined_items = codegened_and_inlined_items;
 
     providers.is_codegened_item = |tcx, def_id| {
-        let (all_mono_items, _) = tcx.collect_and_partition_mono_items(LOCAL_CRATE);
+        let (all_mono_items, _) = tcx.collect_and_partition_mono_items(());
         all_mono_items.contains(&def_id)
     };
 
     providers.codegen_unit = |tcx, name| {
-        let (_, all) = tcx.collect_and_partition_mono_items(LOCAL_CRATE);
+        let (_, all) = tcx.collect_and_partition_mono_items(());
         all.iter()
             .find(|cgu| cgu.name() == name)
             .unwrap_or_else(|| panic!("failed to find cgu with name {:?}", name))

compiler/rustc_save_analysis/src/lib.rs

@@ -95,7 +95,7 @@ impl<'tcx> SaveContext<'tcx> {
         let sess = &self.tcx.sess;
         // Save-analysis is emitted per whole session, not per each crate type
         let crate_type = sess.crate_types()[0];
-        let outputs = &*self.tcx.output_filenames(LOCAL_CRATE);
+        let outputs = &*self.tcx.output_filenames(());
 
         if outputs.outputs.contains_key(&OutputType::Metadata) {
             filename_for_metadata(sess, crate_name, outputs)