rustc_lint: Reuse the set of registered tools from resolver

compiler/rustc_expand/src/base.rs

@@ -8,7 +8,7 @@ use rustc_ast::tokenstream::{CanSynthesizeMissingTokens, TokenStream};
 use rustc_ast::visit::{AssocCtxt, Visitor};
 use rustc_ast::{self as ast, AstLike, Attribute, Item, NodeId, PatKind};
 use rustc_attr::{self as attr, Deprecation, Stability};
-use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync::{self, Lrc};
 use rustc_errors::{Applicability, DiagnosticBuilder, ErrorReported};
 use rustc_lint_defs::builtin::PROC_MACRO_BACK_COMPAT;
@@ -920,6 +920,9 @@ pub trait ResolverExpand {
     /// we generated proc macros harnesses, so that we can map
     /// HIR proc macros items back to their harness items.
     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>;
 }
 
 #[derive(Clone, Default)]

compiler/rustc_interface/src/passes.rs

@@ -11,7 +11,7 @@ use rustc_data_structures::parallel;
 use rustc_data_structures::sync::{Lrc, OnceCell, WorkerLocal};
 use rustc_data_structures::temp_dir::MaybeTempDir;
 use rustc_errors::{Applicability, ErrorReported, PResult};
-use rustc_expand::base::ExtCtxt;
+use rustc_expand::base::{ExtCtxt, ResolverExpand};
 use rustc_hir::def_id::{StableCrateId, LOCAL_CRATE};
 use rustc_hir::Crate;
 use rustc_lint::LintStore;
@@ -20,7 +20,7 @@ use rustc_metadata::{encode_metadata, EncodedMetadata};
 use rustc_middle::arena::Arena;
 use rustc_middle::dep_graph::DepGraph;
 use rustc_middle::ty::query::{ExternProviders, Providers};
-use rustc_middle::ty::{self, GlobalCtxt, ResolverOutputs, TyCtxt};
+use rustc_middle::ty::{self, GlobalCtxt, RegisteredTools, ResolverOutputs, TyCtxt};
 use rustc_mir_build as mir_build;
 use rustc_parse::{parse_crate_from_file, parse_crate_from_source_str, validate_attr};
 use rustc_passes::{self, hir_stats, layout_test};
@@ -236,7 +236,7 @@ pub fn register_plugins<'a>(
 fn pre_expansion_lint(
     sess: &Session,
     lint_store: &LintStore,
-    crate_attrs: &[ast::Attribute],
+    registered_tools: &RegisteredTools,
     check_node: &ast::Crate,
     node_name: &str,
 ) {
@@ -245,7 +245,7 @@ fn pre_expansion_lint(
             sess,
             true,
             lint_store,
-            crate_attrs,
+            registered_tools,
             None,
             rustc_lint::BuiltinCombinedPreExpansionLintPass::new(),
             check_node,
@@ -265,7 +265,7 @@ pub fn configure_and_expand(
     resolver: &mut Resolver<'_>,
 ) -> Result<ast::Crate> {
     tracing::trace!("configure_and_expand");
-    pre_expansion_lint(sess, lint_store, &krate.attrs, &krate, crate_name);
+    pre_expansion_lint(sess, lint_store, resolver.registered_tools(), &krate, crate_name);
     rustc_builtin_macros::register_builtin_macros(resolver);
 
     krate = sess.time("crate_injection", || {
@@ -321,10 +321,10 @@ pub fn configure_and_expand(
             ..rustc_expand::expand::ExpansionConfig::default(crate_name.to_string())
         };
 
-        let crate_attrs = krate.attrs.clone();
+        let registered_tools = resolver.registered_tools().clone();
         let extern_mod_loaded = |ident: Ident, attrs, items, span| {
             let krate = ast::Crate { attrs, items, span, id: DUMMY_NODE_ID, is_placeholder: false };
-            pre_expansion_lint(sess, lint_store, &crate_attrs, &krate, ident.name.as_str());
+            pre_expansion_lint(sess, lint_store, &registered_tools, &krate, ident.name.as_str());
             (krate.attrs, krate.items)
         };
         let mut ecx = ExtCtxt::new(sess, cfg, resolver, Some(&extern_mod_loaded));
@@ -499,12 +499,13 @@ pub fn lower_to_hir<'res, 'tcx>(
     );
 
     sess.time("early_lint_checks", || {
+        let lint_buffer = Some(std::mem::take(resolver.lint_buffer()));
         rustc_lint::check_ast_node(
             sess,
             false,
             lint_store,
-            &krate.attrs,
-            Some(std::mem::take(resolver.lint_buffer())),
+            resolver.registered_tools(),
+            lint_buffer,
             rustc_lint::BuiltinCombinedEarlyLintPass::new(),
             &krate,
         )

compiler/rustc_lint/src/context.rs

@@ -16,10 +16,9 @@
 
 use self::TargetLint::*;
 
-use crate::levels::{is_known_lint_tool, LintLevelsBuilder};
+use crate::levels::LintLevelsBuilder;
 use crate::passes::{EarlyLintPassObject, LateLintPassObject};
-use ast::util::unicode::TEXT_FLOW_CONTROL_CHARS;
-use rustc_ast as ast;
+use rustc_ast::util::unicode::TEXT_FLOW_CONTROL_CHARS;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sync;
 use rustc_errors::{struct_span_err, Applicability, SuggestionStyle};
@@ -32,13 +31,14 @@ use rustc_middle::middle::privacy::AccessLevels;
 use rustc_middle::middle::stability;
 use rustc_middle::ty::layout::{LayoutError, LayoutOfHelpers, TyAndLayout};
 use rustc_middle::ty::print::with_no_trimmed_paths;
-use rustc_middle::ty::{self, print::Printer, subst::GenericArg, Ty, TyCtxt};
+use rustc_middle::ty::{self, print::Printer, subst::GenericArg, RegisteredTools, Ty, TyCtxt};
 use rustc_serialize::json::Json;
 use rustc_session::lint::{BuiltinLintDiagnostics, ExternDepSpec};
 use rustc_session::lint::{FutureIncompatibleInfo, Level, Lint, LintBuffer, LintId};
 use rustc_session::Session;
 use rustc_span::lev_distance::find_best_match_for_name;
-use rustc_span::{symbol::Symbol, BytePos, MultiSpan, Span, DUMMY_SP};
+use rustc_span::symbol::{sym, Ident, Symbol};
+use rustc_span::{BytePos, MultiSpan, Span, DUMMY_SP};
 use rustc_target::abi;
 use tracing::debug;
 
@@ -313,7 +313,7 @@ impl LintStore {
         sess: &Session,
         lint_name: &str,
         level: Level,
-        crate_attrs: &[ast::Attribute],
+        registered_tools: &RegisteredTools,
     ) {
         let (tool_name, lint_name_only) = parse_lint_and_tool_name(lint_name);
         if lint_name_only == crate::WARNINGS.name_lower() && level == Level::ForceWarn {
@@ -326,7 +326,7 @@ impl LintStore {
             )
             .emit();
         }
-        let db = match self.check_lint_name(sess, lint_name_only, tool_name, crate_attrs) {
+        let db = match self.check_lint_name(lint_name_only, tool_name, registered_tools) {
             CheckLintNameResult::Ok(_) => None,
             CheckLintNameResult::Warning(ref msg, _) => Some(sess.struct_warn(msg)),
             CheckLintNameResult::NoLint(suggestion) => {
@@ -397,13 +397,16 @@ impl LintStore {
     /// printing duplicate warnings.
     pub fn check_lint_name(
         &self,
-        sess: &Session,
         lint_name: &str,
         tool_name: Option<Symbol>,
-        crate_attrs: &[ast::Attribute],
+        registered_tools: &RegisteredTools,
     ) -> CheckLintNameResult<'_> {
         if let Some(tool_name) = tool_name {
-            if !is_known_lint_tool(tool_name, sess, crate_attrs) {
+            // FIXME: rustc and rustdoc are considered tools for lints, but not for attributes.
+            if tool_name != sym::rustc
+                && tool_name != sym::rustdoc
+                && !registered_tools.contains(&Ident::with_dummy_span(tool_name))
+            {
                 return CheckLintNameResult::NoTool;
             }
         }
@@ -794,11 +797,16 @@ impl<'a> EarlyContext<'a> {
         sess: &'a Session,
         warn_about_weird_lints: bool,
         lint_store: &'a LintStore,
-        crate_attrs: &'a [ast::Attribute],
+        registered_tools: &'a RegisteredTools,
         buffered: LintBuffer,
     ) -> EarlyContext<'a> {
         EarlyContext {
-            builder: LintLevelsBuilder::new(sess, warn_about_weird_lints, lint_store, crate_attrs),
+            builder: LintLevelsBuilder::new(
+                sess,
+                warn_about_weird_lints,
+                lint_store,
+                registered_tools,
+            ),
             buffered,
         }
     }

compiler/rustc_lint/src/early.rs

@@ -19,6 +19,7 @@ use crate::passes::{EarlyLintPass, EarlyLintPassObject};
 use rustc_ast as ast;
 use rustc_ast::visit as ast_visit;
 use rustc_ast::AstLike;
+use rustc_middle::ty::RegisteredTools;
 use rustc_session::lint::{BufferedEarlyLint, LintBuffer, LintPass};
 use rustc_session::Session;
 use rustc_span::symbol::Ident;
@@ -329,13 +330,19 @@ fn early_lint_node(
     sess: &Session,
     warn_about_weird_lints: bool,
     lint_store: &LintStore,
-    crate_attrs: &[ast::Attribute],
+    registered_tools: &RegisteredTools,
     buffered: LintBuffer,
     pass: impl EarlyLintPass,
     check_node: &ast::Crate,
 ) -> LintBuffer {
     let mut cx = EarlyContextAndPass {
-        context: EarlyContext::new(sess, warn_about_weird_lints, lint_store, crate_attrs, buffered),
+        context: EarlyContext::new(
+            sess,
+            warn_about_weird_lints,
+            lint_store,
+            registered_tools,
+            buffered,
+        ),
         pass,
     };
 
@@ -351,7 +358,7 @@ pub fn check_ast_node(
     sess: &Session,
     pre_expansion: bool,
     lint_store: &LintStore,
-    crate_attrs: &[ast::Attribute],
+    registered_tools: &RegisteredTools,
     lint_buffer: Option<LintBuffer>,
     builtin_lints: impl EarlyLintPass,
     check_node: &ast::Crate,
@@ -366,7 +373,7 @@ pub fn check_ast_node(
             sess,
             pre_expansion,
             lint_store,
-            crate_attrs,
+            registered_tools,
             buffered,
             builtin_lints,
             check_node,
@@ -377,7 +384,7 @@ pub fn check_ast_node(
                 sess,
                 false,
                 lint_store,
-                crate_attrs,
+                registered_tools,
                 buffered,
                 EarlyLintPassObjects { lints: &mut passes[..] },
                 check_node,
@@ -391,7 +398,7 @@ pub fn check_ast_node(
                         sess,
                         pre_expansion && i == 0,
                         lint_store,
-                        crate_attrs,
+                        registered_tools,
                         buffered,
                         EarlyLintPassObjects { lints: slice::from_mut(pass) },
                         check_node,

compiler/rustc_lint/src/levels.rs

@@ -14,7 +14,7 @@ use rustc_middle::lint::{
     COMMAND_LINE,
 };
 use rustc_middle::ty::query::Providers;
-use rustc_middle::ty::TyCtxt;
+use rustc_middle::ty::{RegisteredTools, TyCtxt};
 use rustc_session::lint::{
     builtin::{self, FORBIDDEN_LINT_GROUPS},
     Level, Lint, LintId,
@@ -27,8 +27,8 @@ use tracing::debug;
 
 fn lint_levels(tcx: TyCtxt<'_>, (): ()) -> LintLevelMap {
     let store = unerased_lint_store(tcx);
-    let crate_attrs = tcx.hir().attrs(CRATE_HIR_ID);
-    let levels = LintLevelsBuilder::new(tcx.sess, false, &store, crate_attrs);
+    let levels =
+        LintLevelsBuilder::new(tcx.sess, false, &store, &tcx.resolutions(()).registered_tools);
     let mut builder = LintLevelMapBuilder { levels, tcx };
     let krate = tcx.hir().krate();
 
@@ -49,7 +49,7 @@ pub struct LintLevelsBuilder<'s> {
     cur: LintStackIndex,
     warn_about_weird_lints: bool,
     store: &'s LintStore,
-    crate_attrs: &'s [ast::Attribute],
+    registered_tools: &'s RegisteredTools,
 }
 
 pub struct BuilderPush {
@@ -62,7 +62,7 @@ impl<'s> LintLevelsBuilder<'s> {
         sess: &'s Session,
         warn_about_weird_lints: bool,
         store: &'s LintStore,
-        crate_attrs: &'s [ast::Attribute],
+        registered_tools: &'s RegisteredTools,
     ) -> Self {
         let mut builder = LintLevelsBuilder {
             sess,
@@ -71,7 +71,7 @@ impl<'s> LintLevelsBuilder<'s> {
             id_to_set: Default::default(),
             warn_about_weird_lints,
             store,
-            crate_attrs,
+            registered_tools,
         };
         builder.process_command_line(sess, store);
         assert_eq!(builder.sets.list.len(), 1);
@@ -91,7 +91,7 @@ impl<'s> LintLevelsBuilder<'s> {
         self.sets.lint_cap = sess.opts.lint_cap.unwrap_or(Level::Forbid);
 
         for &(ref lint_name, level) in &sess.opts.lint_opts {
-            store.check_lint_name_cmdline(sess, &lint_name, level, self.crate_attrs);
+            store.check_lint_name_cmdline(sess, &lint_name, level, self.registered_tools);
             let orig_level = level;
             let lint_flag_val = Symbol::intern(lint_name);
 
@@ -314,7 +314,7 @@ impl<'s> LintLevelsBuilder<'s> {
                 let tool_name = tool_ident.map(|ident| ident.name);
                 let name = pprust::path_to_string(&meta_item.path);
                 let lint_result =
-                    self.store.check_lint_name(sess, &name, tool_name, self.crate_attrs);
+                    self.store.check_lint_name(&name, tool_name, self.registered_tools);
                 match &lint_result {
                     CheckLintNameResult::Ok(ids) => {
                         let src = LintLevelSource::Node(
@@ -463,7 +463,7 @@ impl<'s> LintLevelsBuilder<'s> {
                     // Ignore any errors or warnings that happen because the new name is inaccurate
                     // NOTE: `new_name` already includes the tool name, so we don't have to add it again.
                     if let CheckLintNameResult::Ok(ids) =
-                        self.store.check_lint_name(sess, &new_name, None, self.crate_attrs)
+                        self.store.check_lint_name(&new_name, None, self.registered_tools)
                     {
                         let src = LintLevelSource::Node(Symbol::intern(&new_name), sp, reason);
                         for &id in ids {
@@ -566,20 +566,6 @@ impl<'s> LintLevelsBuilder<'s> {
     }
 }
 
-pub fn is_known_lint_tool(m_item: Symbol, sess: &Session, attrs: &[ast::Attribute]) -> bool {
-    if [sym::clippy, sym::rustc, sym::rustdoc].contains(&m_item) {
-        return true;
-    }
-    // Look for registered tools
-    // NOTE: does no error handling; error handling is done by rustc_resolve.
-    sess.filter_by_name(attrs, sym::register_tool)
-        .filter_map(|attr| attr.meta_item_list())
-        .flatten()
-        .filter_map(|nested_meta| nested_meta.ident())
-        .map(|ident| ident.name)
-        .any(|name| name == m_item)
-}
-
 struct LintLevelMapBuilder<'tcx> {
     levels: LintLevelsBuilder<'tcx>,
     tcx: TyCtxt<'tcx>,

compiler/rustc_lint/src/lib.rs

@@ -96,7 +96,7 @@ use unused::*;
 pub use builtin::SoftLints;
 pub use context::{CheckLintNameResult, FindLintError, LintStore};
 pub use context::{EarlyContext, LateContext, LintContext};
-pub use early::check_ast_node;
+pub use early::{check_ast_node, EarlyCheckNode};
 pub use late::check_crate;
 pub use passes::{EarlyLintPass, LateLintPass};
 pub use rustc_session::lint::Level::{self, *};

compiler/rustc_middle/src/ty/mod.rs

@@ -119,6 +119,8 @@ mod sty;
 
 // Data types
 
+pub type RegisteredTools = FxHashSet<Ident>;
+
 #[derive(Debug)]
 pub struct ResolverOutputs {
     pub definitions: rustc_hir::definitions::Definitions,
@@ -141,6 +143,7 @@ pub struct ResolverOutputs {
     /// 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,
 }
 
 #[derive(Clone, Copy, Debug)]