Rollup merge of rust-lang#108806 - cjgillot:query-lints, r=davidtwco

Querify register_tools and post-expansion early lints

The 2 extra queries correspond to code that happen before and after macro expansion, and don't need the resolver to exist.

compiler/rustc_ast_lowering/src/lib.rs

@@ -436,6 +436,7 @@ fn compute_hir_hash(
 pub fn lower_to_hir(tcx: TyCtxt<'_>, (): ()) -> hir::Crate<'_> {
     let sess = tcx.sess;
     tcx.ensure().output_filenames(());
+    let _ = tcx.early_lint_checks(()); // Borrows `resolver_for_lowering`.
     let (mut resolver, krate) = tcx.resolver_for_lowering(()).steal();
 
     let ast_index = index_crate(&resolver.node_id_to_def_id, &krate);

compiler/rustc_driver_impl/src/lib.rs

@@ -331,6 +331,7 @@ fn run_compiler(
             if let Some(ppm) = &sess.opts.pretty {
                 if ppm.needs_ast_map() {
                     queries.global_ctxt()?.enter(|tcx| {
+                        tcx.ensure().early_lint_checks(());
                         pretty::print_after_hir_lowering(tcx, *ppm);
                         Ok(())
                     })?;

compiler/rustc_expand/src/base.rs

@@ -12,13 +12,13 @@ use rustc_ast::tokenstream::TokenStream;
 use rustc_ast::visit::{AssocCtxt, Visitor};
 use rustc_ast::{self as ast, AttrVec, Attribute, HasAttrs, Item, NodeId, PatKind};
 use rustc_attr::{self as attr, Deprecation, Stability};
-use rustc_data_structures::fx::{FxHashSet, FxIndexMap};
+use rustc_data_structures::fx::FxIndexMap;
 use rustc_data_structures::sync::{self, Lrc};
 use rustc_errors::{
     Applicability, DiagnosticBuilder, ErrorGuaranteed, IntoDiagnostic, MultiSpan, PResult,
 };
 use rustc_lint_defs::builtin::PROC_MACRO_BACK_COMPAT;
-use rustc_lint_defs::{BufferedEarlyLint, BuiltinLintDiagnostics};
+use rustc_lint_defs::{BufferedEarlyLint, BuiltinLintDiagnostics, RegisteredTools};
 use rustc_parse::{self, parser, MACRO_ARGUMENTS};
 use rustc_session::errors::report_lit_error;
 use rustc_session::{parse::ParseSess, Limit, Session};
@@ -947,14 +947,14 @@ pub trait ResolverExpand {
     fn declare_proc_macro(&mut self, id: NodeId);
 
     /// Tools registered with `#![register_tool]` and used by tool attributes and lints.
-    fn registered_tools(&self) -> &FxHashSet<Ident>;
+    fn registered_tools(&self) -> &RegisteredTools;
 }
 
 pub trait LintStoreExpand {
     fn pre_expansion_lint(
         &self,
         sess: &Session,
-        registered_tools: &FxHashSet<Ident>,
+        registered_tools: &RegisteredTools,
         node_id: NodeId,
         attrs: &[Attribute],
         items: &[P<Item>],

compiler/rustc_interface/src/passes.rs

@@ -11,7 +11,7 @@ use rustc_data_structures::parallel;
 use rustc_data_structures::steal::Steal;
 use rustc_data_structures::sync::{Lrc, OnceCell, WorkerLocal};
 use rustc_errors::PResult;
-use rustc_expand::base::{ExtCtxt, LintStoreExpand, ResolverExpand};
+use rustc_expand::base::{ExtCtxt, LintStoreExpand};
 use rustc_hir::def_id::{StableCrateId, LOCAL_CRATE};
 use rustc_lint::{unerased_lint_store, BufferedEarlyLint, EarlyCheckNode, LintStore};
 use rustc_metadata::creader::CStore;
@@ -178,7 +178,7 @@ fn configure_and_expand(mut krate: ast::Crate, resolver: &mut Resolver<'_, '_>)
     let sess = tcx.sess;
     let lint_store = unerased_lint_store(tcx);
     let crate_name = tcx.crate_name(LOCAL_CRATE);
-    pre_expansion_lint(sess, lint_store, resolver.registered_tools(), &krate, crate_name);
+    pre_expansion_lint(sess, lint_store, tcx.registered_tools(()), &krate, crate_name);
     rustc_builtin_macros::register_builtin_macros(resolver);
 
     krate = sess.time("crate_injection", || {
@@ -302,6 +302,16 @@ fn configure_and_expand(mut krate: ast::Crate, resolver: &mut Resolver<'_, '_>)
 
     // Done with macro expansion!
 
+    resolver.resolve_crate(&krate);
+
+    krate
+}
+
+fn early_lint_checks(tcx: TyCtxt<'_>, (): ()) {
+    let sess = tcx.sess;
+    let (resolver, krate) = &*tcx.resolver_for_lowering(()).borrow();
+    let mut lint_buffer = resolver.lint_buffer.steal();
+
     if sess.opts.unstable_opts.input_stats {
         eprintln!("Post-expansion node count: {}", count_nodes(&krate));
     }
@@ -310,8 +320,6 @@ fn configure_and_expand(mut krate: ast::Crate, resolver: &mut Resolver<'_, '_>)
         hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS", "ast-stats-2");
     }
 
-    resolver.resolve_crate(&krate);
-
     // Needs to go *after* expansion to be able to check the results of macro expansion.
     sess.time("complete_gated_feature_checking", || {
         rustc_ast_passes::feature_gate::check_crate(&krate, sess);
@@ -321,7 +329,7 @@ fn configure_and_expand(mut krate: ast::Crate, resolver: &mut Resolver<'_, '_>)
     sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
         info!("{} parse sess buffered_lints", buffered_lints.len());
         for early_lint in buffered_lints.drain(..) {
-            resolver.lint_buffer().add_early_lint(early_lint);
+            lint_buffer.add_early_lint(early_lint);
         }
     });
 
@@ -340,20 +348,16 @@ fn configure_and_expand(mut krate: ast::Crate, resolver: &mut Resolver<'_, '_>)
         }
     });
 
-    sess.time("early_lint_checks", || {
-        let lint_buffer = Some(std::mem::take(resolver.lint_buffer()));
-        rustc_lint::check_ast_node(
-            sess,
-            false,
-            lint_store,
-            resolver.registered_tools(),
-            lint_buffer,
-            rustc_lint::BuiltinCombinedEarlyLintPass::new(),
-            &krate,
-        )
-    });
-
-    krate
+    let lint_store = unerased_lint_store(tcx);
+    rustc_lint::check_ast_node(
+        sess,
+        false,
+        lint_store,
+        tcx.registered_tools(()),
+        Some(lint_buffer),
+        rustc_lint::BuiltinCombinedEarlyLintPass::new(),
+        &**krate,
+    )
 }
 
 // Returns all the paths that correspond to generated files.
@@ -557,6 +561,7 @@ fn resolver_for_lowering<'tcx>(
     (): (),
 ) -> &'tcx Steal<(ty::ResolverAstLowering, Lrc<ast::Crate>)> {
     let arenas = Resolver::arenas();
+    let _ = tcx.registered_tools(()); // Uses `crate_for_resolver`.
     let krate = tcx.crate_for_resolver(()).steal();
     let mut resolver = Resolver::new(tcx, &krate, &arenas);
     let krate = configure_and_expand(krate, &mut resolver);
@@ -629,6 +634,7 @@ pub static DEFAULT_QUERY_PROVIDERS: LazyLock<Providers> = LazyLock::new(|| {
     providers.hir_crate = rustc_ast_lowering::lower_to_hir;
     providers.output_filenames = output_filenames;
     providers.resolver_for_lowering = resolver_for_lowering;
+    providers.early_lint_checks = early_lint_checks;
     proc_macro_decls::provide(providers);
     rustc_const_eval::provide(providers);
     rustc_middle::hir::provide(providers);
@@ -637,6 +643,7 @@ pub static DEFAULT_QUERY_PROVIDERS: LazyLock<Providers> = LazyLock::new(|| {
     rustc_mir_transform::provide(providers);
     rustc_monomorphize::provide(providers);
     rustc_privacy::provide(providers);
+    rustc_resolve::provide(providers);
     rustc_hir_analysis::provide(providers);
     rustc_hir_typeck::provide(providers);
     ty::provide(providers);

compiler/rustc_lint/src/levels.rs

@@ -128,7 +128,7 @@ fn lint_expectations(tcx: TyCtxt<'_>, (): ()) -> Vec<(LintExpectationId, LintExp
         },
         warn_about_weird_lints: false,
         store,
-        registered_tools: &tcx.resolutions(()).registered_tools,
+        registered_tools: &tcx.registered_tools(()),
     };
 
     builder.add_command_line();
@@ -156,7 +156,7 @@ fn shallow_lint_levels_on(tcx: TyCtxt<'_>, owner: hir::OwnerId) -> ShallowLintLe
         },
         warn_about_weird_lints: false,
         store,
-        registered_tools: &tcx.resolutions(()).registered_tools,
+        registered_tools: &tcx.registered_tools(()),
     };
 
     if owner == hir::CRATE_OWNER_ID {

compiler/rustc_lint_defs/src/lib.rs

@@ -8,7 +8,7 @@ extern crate rustc_macros;
 pub use self::Level::*;
 use rustc_ast::node_id::NodeId;
 use rustc_ast::{AttrId, Attribute};
-use rustc_data_structures::fx::FxIndexMap;
+use rustc_data_structures::fx::{FxIndexMap, FxIndexSet};
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher, ToStableHashKey};
 use rustc_error_messages::{DiagnosticMessage, MultiSpan};
 use rustc_hir::HashStableContext;
@@ -533,6 +533,7 @@ pub enum BuiltinLintDiagnostics {
 
 /// Lints that are buffered up early on in the `Session` before the
 /// `LintLevels` is calculated.
+#[derive(Debug)]
 pub struct BufferedEarlyLint {
     /// The span of code that we are linting on.
     pub span: MultiSpan,
@@ -551,7 +552,7 @@ pub struct BufferedEarlyLint {
     pub diagnostic: BuiltinLintDiagnostics,
 }
 
-#[derive(Default)]
+#[derive(Default, Debug)]
 pub struct LintBuffer {
     pub map: FxIndexMap<NodeId, Vec<BufferedEarlyLint>>,
 }
@@ -601,6 +602,8 @@ impl LintBuffer {
     }
 }
 
+pub type RegisteredTools = FxIndexSet<Ident>;
+
 /// Declares a static item of type `&'static Lint`.
 ///
 /// See <https://rustc-dev-guide.rust-lang.org/diagnostics.html> for

compiler/rustc_middle/src/arena.rs

@@ -108,6 +108,7 @@ macro_rules! arena_types {
             // (during lowering) and the `librustc_middle` arena (for decoding MIR)
             [decode] asm_template: rustc_ast::InlineAsmTemplatePiece,
             [decode] used_trait_imports: rustc_data_structures::unord::UnordSet<rustc_hir::def_id::LocalDefId>,
+            [decode] registered_tools: rustc_middle::ty::RegisteredTools,
             [decode] is_late_bound_map: rustc_data_structures::fx::FxIndexSet<rustc_hir::ItemLocalId>,
             [decode] impl_source: rustc_middle::traits::ImplSource<'tcx, ()>,
 

compiler/rustc_middle/src/query/mod.rs

@@ -26,6 +26,15 @@ rustc_queries! {
         desc { "triggering a delay span bug" }
     }
 
+    query registered_tools(_: ()) -> &'tcx ty::RegisteredTools {
+        arena_cache
+        desc { "compute registered tools for crate" }
+    }
+
+    query early_lint_checks(_: ()) -> () {
+        desc { "perform lints prior to macro expansion" }
+    }
+
     query resolutions(_: ()) -> &'tcx ty::ResolverGlobalCtxt {
         feedable
         no_hash

compiler/rustc_middle/src/ty/mod.rs

@@ -34,6 +34,7 @@ use rustc_attr as attr;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap, FxIndexSet};
 use rustc_data_structures::intern::Interned;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
+use rustc_data_structures::steal::Steal;
 use rustc_data_structures::tagged_ptr::CopyTaggedPtr;
 use rustc_errors::ErrorGuaranteed;
 use rustc_hir as hir;
@@ -44,6 +45,8 @@ use rustc_index::vec::IndexVec;
 use rustc_macros::HashStable;
 use rustc_query_system::ich::StableHashingContext;
 use rustc_serialize::{Decodable, Encodable};
+use rustc_session::lint::LintBuffer;
+pub use rustc_session::lint::RegisteredTools;
 use rustc_span::hygiene::MacroKind;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::{ExpnId, ExpnKind, Span};
@@ -148,8 +151,6 @@ mod typeck_results;
 
 // Data types
 
-pub type RegisteredTools = FxHashSet<Ident>;
-
 pub struct ResolverOutputs {
     pub global_ctxt: ResolverGlobalCtxt,
     pub ast_lowering: ResolverAstLowering,
@@ -175,7 +176,6 @@ pub struct ResolverGlobalCtxt {
     /// Mapping from ident span to path span for paths that don't exist as written, but that
     /// exist under `std`. For example, wrote `str::from_utf8` instead of `std::str::from_utf8`.
     pub confused_type_with_std_module: FxHashMap<Span, Span>,
-    pub registered_tools: RegisteredTools,
     pub doc_link_resolutions: FxHashMap<LocalDefId, DocLinkResMap>,
     pub doc_link_traits_in_scope: FxHashMap<LocalDefId, Vec<DefId>>,
     pub all_macro_rules: FxHashMap<Symbol, Res<ast::NodeId>>,
@@ -209,6 +209,9 @@ pub struct ResolverAstLowering {
     pub builtin_macro_kinds: FxHashMap<LocalDefId, MacroKind>,
     /// List functions and methods for which lifetime elision was successful.
     pub lifetime_elision_allowed: FxHashSet<ast::NodeId>,
+
+    /// Lints that were emitted by the resolver and early lints.
+    pub lint_buffer: Steal<LintBuffer>,
 }
 
 #[derive(Clone, Copy, Debug)]

compiler/rustc_resolve/src/lib.rs

@@ -27,6 +27,7 @@ use rustc_ast::{self as ast, NodeId, CRATE_NODE_ID};
 use rustc_ast::{AngleBracketedArg, Crate, Expr, ExprKind, GenericArg, GenericArgs, LitKind, Path};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap, FxIndexSet};
 use rustc_data_structures::intern::Interned;
+use rustc_data_structures::steal::Steal;
 use rustc_data_structures::sync::{Lrc, MappedReadGuard};
 use rustc_errors::{
     Applicability, DiagnosticBuilder, DiagnosticMessage, ErrorGuaranteed, SubdiagnosticMessage,
@@ -965,7 +966,7 @@ pub struct Resolver<'a, 'tcx> {
     /// A small map keeping true kinds of built-in macros that appear to be fn-like on
     /// the surface (`macro` items in libcore), but are actually attributes or derives.
     builtin_macro_kinds: FxHashMap<LocalDefId, MacroKind>,
-    registered_tools: RegisteredTools,
+    registered_tools: &'tcx RegisteredTools,
     macro_use_prelude: FxHashMap<Symbol, &'a NameBinding<'a>>,
     macro_map: FxHashMap<DefId, MacroData>,
     dummy_ext_bang: Lrc<SyntaxExtension>,
@@ -1233,7 +1234,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
             }
         }
 
-        let registered_tools = macros::registered_tools(tcx.sess, &krate.attrs);
+        let registered_tools = tcx.registered_tools(());
 
         let features = tcx.sess.features_untracked();
 
@@ -1408,7 +1409,6 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
             trait_impls: self.trait_impls,
             proc_macros,
             confused_type_with_std_module,
-            registered_tools: self.registered_tools,
             doc_link_resolutions: self.doc_link_resolutions,
             doc_link_traits_in_scope: self.doc_link_traits_in_scope,
             all_macro_rules: self.all_macro_rules,
@@ -1426,6 +1426,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
             trait_map: self.trait_map,
             builtin_macro_kinds: self.builtin_macro_kinds,
             lifetime_elision_allowed: self.lifetime_elision_allowed,
+            lint_buffer: Steal::new(self.lint_buffer),
         };
         ResolverOutputs { global_ctxt, ast_lowering }
     }
@@ -2040,3 +2041,7 @@ impl Finalize {
         Finalize { node_id, path_span, root_span, report_private: true }
     }
 }
+
+pub fn provide(providers: &mut ty::query::Providers) {
+    providers.registered_tools = macros::registered_tools;
+}

compiler/rustc_resolve/src/macros.rs

@@ -8,7 +8,6 @@ use crate::{ModuleKind, ModuleOrUniformRoot, NameBinding, PathResult, Segment};
 use rustc_ast::{self as ast, Inline, ItemKind, ModKind, NodeId};
 use rustc_ast_pretty::pprust;
 use rustc_attr::StabilityLevel;
-use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::intern::Interned;
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::{struct_span_err, Applicability};
@@ -20,11 +19,11 @@ use rustc_hir::def::{self, DefKind, NonMacroAttrKind};
 use rustc_hir::def_id::{CrateNum, LocalDefId};
 use rustc_middle::middle::stability;
 use rustc_middle::ty::RegisteredTools;
+use rustc_middle::ty::TyCtxt;
 use rustc_session::lint::builtin::{LEGACY_DERIVE_HELPERS, SOFT_UNSTABLE};
 use rustc_session::lint::builtin::{UNUSED_MACROS, UNUSED_MACRO_RULES};
 use rustc_session::lint::BuiltinLintDiagnostics;
 use rustc_session::parse::feature_err;
-use rustc_session::Session;
 use rustc_span::edition::Edition;
 use rustc_span::hygiene::{self, ExpnData, ExpnKind, LocalExpnId};
 use rustc_span::hygiene::{AstPass, MacroKind};
@@ -111,23 +110,28 @@ fn fast_print_path(path: &ast::Path) -> Symbol {
     }
 }
 
-pub(crate) fn registered_tools(sess: &Session, attrs: &[ast::Attribute]) -> FxHashSet<Ident> {
-    let mut registered_tools = FxHashSet::default();
-    for attr in sess.filter_by_name(attrs, sym::register_tool) {
+pub(crate) fn registered_tools(tcx: TyCtxt<'_>, (): ()) -> RegisteredTools {
+    let mut registered_tools = RegisteredTools::default();
+    let krate = tcx.crate_for_resolver(()).borrow();
+    for attr in tcx.sess.filter_by_name(&krate.attrs, sym::register_tool) {
         for nested_meta in attr.meta_item_list().unwrap_or_default() {
             match nested_meta.ident() {
                 Some(ident) => {
                     if let Some(old_ident) = registered_tools.replace(ident) {
                         let msg = format!("{} `{}` was already registered", "tool", ident);
-                        sess.struct_span_err(ident.span, &msg)
+                        tcx.sess
+                            .struct_span_err(ident.span, &msg)
                             .span_label(old_ident.span, "already registered here")
                             .emit();
                     }
                 }
                 None => {
                     let msg = format!("`{}` only accepts identifiers", sym::register_tool);
                     let span = nested_meta.span();
-                    sess.struct_span_err(span, &msg).span_label(span, "not an identifier").emit();
+                    tcx.sess
+                        .struct_span_err(span, &msg)
+                        .span_label(span, "not an identifier")
+                        .emit();
                 }
             }
         }