Rollup merge of #117649 - nnethercote:mv-lint_store, r=cjgillot

Move `lint_store`

Some nice cleanups enabled by the removal of compiler plugins.

r? `@cjgillot`

compiler/rustc_driver_impl/src/lib.rs

@@ -33,7 +33,7 @@ use rustc_feature::find_gated_cfg;
 use rustc_fluent_macro::fluent_messages;
 use rustc_interface::util::{self, collect_crate_types, get_codegen_backend};
 use rustc_interface::{interface, Queries};
-use rustc_lint::{unerased_lint_store, LintStore};
+use rustc_lint::unerased_lint_store;
 use rustc_metadata::locator;
 use rustc_session::config::{nightly_options, CG_OPTIONS, Z_OPTIONS};
 use rustc_session::config::{ErrorOutputType, Input, OutFileName, OutputType, TrimmedDefPaths};
@@ -356,16 +356,7 @@ fn run_compiler(
                     let handler = EarlyErrorHandler::new(sopts.error_format);
 
                     if sopts.describe_lints {
-                        let mut lint_store =
-                            rustc_lint::new_lint_store(compiler.session().enable_internal_lints());
-                        let registered_lints =
-                            if let Some(register_lints) = compiler.register_lints() {
-                                register_lints(compiler.session(), &mut lint_store);
-                                true
-                            } else {
-                                false
-                            };
-                        describe_lints(compiler.session(), &lint_store, registered_lints);
+                        describe_lints(compiler.session());
                         return;
                     }
                     let should_stop = print_crate_info(
@@ -442,9 +433,7 @@ fn run_compiler(
             }
 
             if sess.opts.describe_lints {
-                queries
-                    .global_ctxt()?
-                    .enter(|tcx| describe_lints(sess, unerased_lint_store(tcx), true));
+                describe_lints(sess);
                 return early_exit();
             }
 
@@ -991,7 +980,7 @@ the command line flag directly.
 }
 
 /// Write to stdout lint command options, together with a list of all available lints
-pub fn describe_lints(sess: &Session, lint_store: &LintStore, loaded_lints: bool) {
+pub fn describe_lints(sess: &Session) {
     safe_println!(
         "
 Available lint options:
@@ -1017,6 +1006,7 @@ Available lint options:
         lints
     }
 
+    let lint_store = unerased_lint_store(sess);
     let (loaded, builtin): (Vec<_>, _) =
         lint_store.get_lints().iter().cloned().partition(|&lint| lint.is_loaded);
     let loaded = sort_lints(sess, loaded);
@@ -1094,7 +1084,7 @@ Available lint options:
 
     print_lint_groups(builtin_groups, true);
 
-    match (loaded_lints, loaded.len(), loaded_groups.len()) {
+    match (sess.registered_lints, loaded.len(), loaded_groups.len()) {
         (false, 0, _) | (false, _, 0) => {
             safe_println!("Lint tools like Clippy can load additional lints and lint groups.");
         }

compiler/rustc_interface/src/interface.rs

@@ -40,7 +40,6 @@ pub type Result<T> = result::Result<T, ErrorGuaranteed>;
 pub struct Compiler {
     pub(crate) sess: Lrc<Session>,
     codegen_backend: Lrc<dyn CodegenBackend>,
-    pub(crate) register_lints: Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>>,
     pub(crate) override_queries: Option<fn(&Session, &mut Providers)>,
 }
 
@@ -51,9 +50,6 @@ impl Compiler {
     pub fn codegen_backend(&self) -> &Lrc<dyn CodegenBackend> {
         &self.codegen_backend
     }
-    pub fn register_lints(&self) -> &Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>> {
-        &self.register_lints
-    }
     pub fn build_output_filenames(
         &self,
         sess: &Session,
@@ -485,10 +481,19 @@ pub fn run_compiler<R: Send>(config: Config, f: impl FnOnce(&Compiler) -> R + Se
                 sess.opts.untracked_state_hash = hasher.finish()
             }
 
+            // Even though the session holds the lint store, we can't build the
+            // lint store until after the session exists. And we wait until now
+            // so that `register_lints` sees the fully initialized session.
+            let mut lint_store = rustc_lint::new_lint_store(sess.enable_internal_lints());
+            if let Some(register_lints) = config.register_lints.as_deref() {
+                register_lints(&sess, &mut lint_store);
+                sess.registered_lints = true;
+            }
+            sess.lint_store = Some(Lrc::new(lint_store));
+
             let compiler = Compiler {
                 sess: Lrc::new(sess),
                 codegen_backend: Lrc::from(codegen_backend),
-                register_lints: config.register_lints,
                 override_queries: config.override_queries,
             };
 

compiler/rustc_interface/src/passes.rs

@@ -72,17 +72,6 @@ fn count_nodes(krate: &ast::Crate) -> usize {
     counter.count
 }
 
-pub(crate) fn create_lint_store(
-    sess: &Session,
-    register_lints: Option<impl Fn(&Session, &mut LintStore)>,
-) -> LintStore {
-    let mut lint_store = rustc_lint::new_lint_store(sess.enable_internal_lints());
-    if let Some(register_lints) = register_lints {
-        register_lints(sess, &mut lint_store);
-    }
-    lint_store
-}
-
 fn pre_expansion_lint<'a>(
     sess: &Session,
     features: &Features,
@@ -138,7 +127,7 @@ fn configure_and_expand(
     let tcx = resolver.tcx();
     let sess = tcx.sess;
     let features = tcx.features();
-    let lint_store = unerased_lint_store(tcx);
+    let lint_store = unerased_lint_store(&tcx.sess);
     let crate_name = tcx.crate_name(LOCAL_CRATE);
     let lint_check_node = (&krate, pre_configured_attrs);
     pre_expansion_lint(
@@ -330,7 +319,7 @@ fn early_lint_checks(tcx: TyCtxt<'_>, (): ()) {
         }
     });
 
-    let lint_store = unerased_lint_store(tcx);
+    let lint_store = unerased_lint_store(&tcx.sess);
     rustc_lint::check_ast_node(
         sess,
         tcx.features(),
@@ -645,7 +634,6 @@ pub fn create_global_ctxt<'tcx>(
     compiler: &'tcx Compiler,
     crate_types: Vec<CrateType>,
     stable_crate_id: StableCrateId,
-    lint_store: Lrc<LintStore>,
     dep_graph: DepGraph,
     untracked: Untracked,
     gcx_cell: &'tcx OnceLock<GlobalCtxt<'tcx>>,
@@ -676,7 +664,6 @@ pub fn create_global_ctxt<'tcx>(
                 sess,
                 crate_types,
                 stable_crate_id,
-                lint_store,
                 arena,
                 hir_arena,
                 untracked,

compiler/rustc_interface/src/queries.rs

@@ -148,8 +148,6 @@ impl<'tcx> Queries<'tcx> {
             );
             let dep_graph = setup_dep_graph(sess, crate_name, stable_crate_id)?;
 
-            let lint_store =
-                Lrc::new(passes::create_lint_store(sess, self.compiler.register_lints.as_deref()));
             let cstore = FreezeLock::new(Box::new(CStore::new(
                 self.codegen_backend().metadata_loader(),
                 stable_crate_id,
@@ -164,7 +162,6 @@ impl<'tcx> Queries<'tcx> {
                 self.compiler,
                 crate_types,
                 stable_crate_id,
-                lint_store,
                 dep_graph,
                 untracked,
                 &self.gcx_cell,

compiler/rustc_lint/src/context.rs

@@ -497,9 +497,6 @@ pub struct LateContext<'tcx> {
     /// Items accessible from the crate being checked.
     pub effective_visibilities: &'tcx EffectiveVisibilities,
 
-    /// The store of registered lints and the lint levels.
-    pub lint_store: &'tcx LintStore,
-
     pub last_node_with_lint_attrs: hir::HirId,
 
     /// Generic type parameters in scope for the item we are in.
@@ -515,21 +512,14 @@ pub struct EarlyContext<'a> {
     pub buffered: LintBuffer,
 }
 
-pub trait LintPassObject: Sized {}
-
-impl LintPassObject for EarlyLintPassObject {}
-
-impl LintPassObject for LateLintPassObject<'_> {}
-
-pub trait LintContext: Sized {
-    type PassObject: LintPassObject;
-
+pub trait LintContext {
     fn sess(&self) -> &Session;
-    fn lints(&self) -> &LintStore;
 
-    /// Emit a lint at the appropriate level, with an optional associated span and an existing diagnostic.
+    /// Emit a lint at the appropriate level, with an optional associated span and an existing
+    /// diagnostic.
     ///
-    /// Return value of the `decorate` closure is ignored, see [`struct_lint_level`] for a detailed explanation.
+    /// Return value of the `decorate` closure is ignored, see [`struct_lint_level`] for a detailed
+    /// explanation.
     ///
     /// [`struct_lint_level`]: rustc_middle::lint::struct_lint_level#decorate-signature
     #[rustc_lint_diagnostics]
@@ -1059,17 +1049,11 @@ impl<'a> EarlyContext<'a> {
 }
 
 impl<'tcx> LintContext for LateContext<'tcx> {
-    type PassObject = LateLintPassObject<'tcx>;
-
     /// Gets the overall compiler `Session` object.
     fn sess(&self) -> &Session {
         &self.tcx.sess
     }
 
-    fn lints(&self) -> &LintStore {
-        &*self.lint_store
-    }
-
     #[rustc_lint_diagnostics]
     fn lookup<S: Into<MultiSpan>>(
         &self,
@@ -1094,17 +1078,11 @@ impl<'tcx> LintContext for LateContext<'tcx> {
 }
 
 impl LintContext for EarlyContext<'_> {
-    type PassObject = EarlyLintPassObject;
-
     /// Gets the overall compiler `Session` object.
     fn sess(&self) -> &Session {
         &self.builder.sess()
     }
 
-    fn lints(&self) -> &LintStore {
-        self.builder.lint_store()
-    }
-
     #[rustc_lint_diagnostics]
     fn lookup<S: Into<MultiSpan>>(
         &self,

compiler/rustc_lint/src/late.rs

@@ -17,22 +17,25 @@
 use crate::{passes::LateLintPassObject, LateContext, LateLintPass, LintStore};
 use rustc_ast as ast;
 use rustc_data_structures::stack::ensure_sufficient_stack;
-use rustc_data_structures::sync::join;
+use rustc_data_structures::sync::{join, Lrc};
 use rustc_hir as hir;
 use rustc_hir::def_id::{LocalDefId, LocalModDefId};
 use rustc_hir::intravisit as hir_visit;
 use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_session::lint::LintPass;
+use rustc_session::Session;
 use rustc_span::Span;
 
 use std::any::Any;
 use std::cell::Cell;
 
 /// Extract the `LintStore` from the query context.
-/// This function exists because we've erased `LintStore` as `dyn Any` in the context.
-pub fn unerased_lint_store(tcx: TyCtxt<'_>) -> &LintStore {
-    let store: &dyn Any = &*tcx.lint_store;
+/// This function exists because we've erased `LintStore` as `dyn Any` in the session.
+pub fn unerased_lint_store(sess: &Session) -> &LintStore {
+    assert!(sess.lint_store.is_some());
+    let store: &Lrc<_> = sess.lint_store.as_ref().unwrap();
+    let store: &dyn Any = &**store;
     store.downcast_ref().unwrap()
 }
 
@@ -353,7 +356,6 @@ pub fn late_lint_mod<'tcx, T: LateLintPass<'tcx> + 'tcx>(
         cached_typeck_results: Cell::new(None),
         param_env: ty::ParamEnv::empty(),
         effective_visibilities: &tcx.effective_visibilities(()),
-        lint_store: unerased_lint_store(tcx),
         last_node_with_lint_attrs: tcx.hir().local_def_id_to_hir_id(module_def_id),
         generics: None,
         only_module: true,
@@ -362,8 +364,11 @@ pub fn late_lint_mod<'tcx, T: LateLintPass<'tcx> + 'tcx>(
     // Note: `passes` is often empty. In that case, it's faster to run
     // `builtin_lints` directly rather than bundling it up into the
     // `RuntimeCombinedLateLintPass`.
-    let mut passes: Vec<_> =
-        unerased_lint_store(tcx).late_module_passes.iter().map(|mk_pass| (mk_pass)(tcx)).collect();
+    let mut passes: Vec<_> = unerased_lint_store(&tcx.sess)
+        .late_module_passes
+        .iter()
+        .map(|mk_pass| (mk_pass)(tcx))
+        .collect();
     if passes.is_empty() {
         late_lint_mod_inner(tcx, module_def_id, context, builtin_lints);
     } else {
@@ -400,7 +405,7 @@ fn late_lint_mod_inner<'tcx, T: LateLintPass<'tcx>>(
 fn late_lint_crate<'tcx>(tcx: TyCtxt<'tcx>) {
     // Note: `passes` is often empty.
     let mut passes: Vec<_> =
-        unerased_lint_store(tcx).late_passes.iter().map(|mk_pass| (mk_pass)(tcx)).collect();
+        unerased_lint_store(&tcx.sess).late_passes.iter().map(|mk_pass| (mk_pass)(tcx)).collect();
 
     if passes.is_empty() {
         return;
@@ -412,7 +417,6 @@ fn late_lint_crate<'tcx>(tcx: TyCtxt<'tcx>) {
         cached_typeck_results: Cell::new(None),
         param_env: ty::ParamEnv::empty(),
         effective_visibilities: &tcx.effective_visibilities(()),
-        lint_store: unerased_lint_store(tcx),
         last_node_with_lint_attrs: hir::CRATE_HIR_ID,
         generics: None,
         only_module: false,

compiler/rustc_lint/src/levels.rs

@@ -123,7 +123,7 @@ impl LintLevelSets {
 }
 
 fn lint_expectations(tcx: TyCtxt<'_>, (): ()) -> Vec<(LintExpectationId, LintExpectation)> {
-    let store = unerased_lint_store(tcx);
+    let store = unerased_lint_store(&tcx.sess);
 
     let mut builder = LintLevelsBuilder {
         sess: tcx.sess,
@@ -152,7 +152,7 @@ fn lint_expectations(tcx: TyCtxt<'_>, (): ()) -> Vec<(LintExpectationId, LintExp
 
 #[instrument(level = "trace", skip(tcx), ret)]
 fn shallow_lint_levels_on(tcx: TyCtxt<'_>, owner: hir::OwnerId) -> ShallowLintLevelMap {
-    let store = unerased_lint_store(tcx);
+    let store = unerased_lint_store(&tcx.sess);
     let attrs = tcx.hir_attrs(owner);
 
     let mut levels = LintLevelsBuilder {
@@ -548,10 +548,6 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
         self.features
     }
 
-    pub(crate) fn lint_store(&self) -> &LintStore {
-        self.store
-    }
-
     fn current_specs(&self) -> &FxHashMap<LintId, LevelAndSource> {
         self.provider.current_specs()
     }

compiler/rustc_middle/src/ty/context.rs

@@ -39,7 +39,7 @@ use rustc_data_structures::profiling::SelfProfilerRef;
 use rustc_data_structures::sharded::{IntoPointer, ShardedHashMap};
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::steal::Steal;
-use rustc_data_structures::sync::{self, FreezeReadGuard, Lock, Lrc, WorkerLocal};
+use rustc_data_structures::sync::{FreezeReadGuard, Lock, WorkerLocal};
 use rustc_data_structures::unord::UnordSet;
 use rustc_errors::{
     DecorateLint, DiagnosticBuilder, DiagnosticMessage, ErrorGuaranteed, MultiSpan,
@@ -69,7 +69,6 @@ use rustc_type_ir::TyKind::*;
 use rustc_type_ir::WithCachedTypeInfo;
 use rustc_type_ir::{CollectAndApply, Interner, TypeFlags};
 
-use std::any::Any;
 use std::borrow::Borrow;
 use std::cmp::Ordering;
 use std::fmt;
@@ -544,12 +543,6 @@ pub struct GlobalCtxt<'tcx> {
     /// `rustc_symbol_mangling` crate for more information.
     stable_crate_id: StableCrateId,
 
-    /// This only ever stores a `LintStore` but we don't want a dependency on that type here.
-    ///
-    /// FIXME(Centril): consider `dyn LintStoreMarker` once
-    /// we can upcast to `Any` for some additional type safety.
-    pub lint_store: Lrc<dyn Any + sync::DynSync + sync::DynSend>,
-
     pub dep_graph: DepGraph,
 
     pub prof: SelfProfilerRef,
@@ -709,7 +702,6 @@ impl<'tcx> TyCtxt<'tcx> {
         s: &'tcx Session,
         crate_types: Vec<CrateType>,
         stable_crate_id: StableCrateId,
-        lint_store: Lrc<dyn Any + sync::DynSend + sync::DynSync>,
         arena: &'tcx WorkerLocal<Arena<'tcx>>,
         hir_arena: &'tcx WorkerLocal<hir::Arena<'tcx>>,
         untracked: Untracked,
@@ -730,7 +722,6 @@ impl<'tcx> TyCtxt<'tcx> {
             sess: s,
             crate_types,
             stable_crate_id,
-            lint_store,
             arena,
             hir_arena,
             interners,