refactor(linter): remove with_rule_name from the tight loop (#3335)

crates/oxc_linter/src/context.rs

@@ -12,19 +12,20 @@ use crate::{
     ESLintConfig, ESLintEnv, ESLintGlobals, ESLintSettings,
 };
 
+#[derive(Clone)]
 pub struct LintContext<'a> {
     semantic: Rc<Semantic<'a>>,
 
     diagnostics: RefCell<Vec<Message<'a>>>,
 
-    disable_directives: DisableDirectives<'a>,
+    disable_directives: Rc<DisableDirectives<'a>>,
 
     /// Whether or not to apply code fixes during linting.
     fix: bool,
 
     current_rule_name: &'static str,
 
-    file_path: Box<Path>,
+    file_path: Rc<Path>,
 
     eslint_config: Arc<ESLintConfig>,
 }
@@ -36,10 +37,10 @@ impl<'a> LintContext<'a> {
         Self {
             semantic: Rc::clone(semantic),
             diagnostics: RefCell::new(vec![]),
-            disable_directives,
+            disable_directives: Rc::new(disable_directives),
             fix: false,
             current_rule_name: "",
-            file_path,
+            file_path: file_path.into(),
             eslint_config: Arc::new(ESLintConfig::default()),
         }
     }
@@ -99,15 +100,16 @@ impl<'a> LintContext<'a> {
         false
     }
 
-    #[inline]
-    pub fn with_rule_name(&mut self, name: &'static str) {
+    #[must_use]
+    pub fn with_rule_name(mut self, name: &'static str) -> Self {
         self.current_rule_name = name;
+        self
     }
 
     /* Diagnostics */
 
     pub fn into_message(self) -> Vec<Message<'a>> {
-        self.diagnostics.into_inner()
+        self.diagnostics.borrow().iter().cloned().collect::<Vec<_>>()
     }
 
     fn add_diagnostic(&self, message: Message<'a>) {

crates/oxc_linter/src/fixer.rs

@@ -3,7 +3,7 @@ use std::borrow::Cow;
 use oxc_diagnostics::OxcDiagnostic;
 use oxc_span::Span;
 
-#[derive(Debug, Default)]
+#[derive(Debug, Clone, Default)]
 pub struct Fix<'a> {
     pub content: Cow<'a, str>,
     pub span: Span,
@@ -25,6 +25,7 @@ pub struct FixResult<'a> {
     pub messages: Vec<Message<'a>>,
 }
 
+#[derive(Clone)]
 pub struct Message<'a> {
     pub error: OxcDiagnostic,
     pub start: u32,

crates/oxc_linter/src/lib.rs

@@ -52,7 +52,7 @@ fn size_asserts() {
 
 #[derive(Debug)]
 pub struct Linter {
-    rules: Vec<(/* rule name */ &'static str, RuleEnum)>,
+    rules: Vec<RuleEnum>,
     options: LintOptions,
     eslint_config: Arc<ESLintConfig>,
 }
@@ -69,13 +69,12 @@ impl Linter {
     /// Returns `Err` if there are any errors parsing the configuration file.
     pub fn from_options(options: LintOptions) -> Result<Self, Error> {
         let (rules, eslint_config) = options.derive_rules_and_config()?;
-        let rules = rules.into_iter().map(|rule| (rule.name(), rule)).collect();
         Ok(Self { rules, options, eslint_config: Arc::new(eslint_config) })
     }
 
     #[must_use]
     pub fn with_rules(mut self, rules: Vec<RuleEnum>) -> Self {
-        self.rules = rules.into_iter().map(|rule| (rule.name(), rule)).collect();
+        self.rules = rules;
         self
     }
 
@@ -101,34 +100,40 @@ impl Linter {
 
     pub fn run<'a>(&self, ctx: LintContext<'a>) -> Vec<Message<'a>> {
         let semantic = Rc::clone(ctx.semantic());
-        let mut ctx = ctx.with_fix(self.options.fix).with_eslint_config(&self.eslint_config);
 
-        for (rule_name, rule) in &self.rules {
-            ctx.with_rule_name(rule_name);
-            rule.run_once(&ctx);
+        let ctx = ctx.with_fix(self.options.fix).with_eslint_config(&self.eslint_config);
+        let rules = self
+            .rules
+            .iter()
+            .map(|rule| (rule, ctx.clone().with_rule_name(rule.name())))
+            .collect::<Vec<_>>();
+
+        for (rule, ctx) in &rules {
+            rule.run_once(ctx);
         }
 
         for symbol in semantic.symbols().iter() {
-            for (rule_name, rule) in &self.rules {
-                ctx.with_rule_name(rule_name);
-                rule.run_on_symbol(symbol, &ctx);
+            for (rule, ctx) in &rules {
+                rule.run_on_symbol(symbol, ctx);
             }
         }
 
         for node in semantic.nodes().iter() {
-            for (rule_name, rule) in &self.rules {
-                ctx.with_rule_name(rule_name);
-                rule.run(node, &ctx);
+            for (rule, ctx) in &rules {
+                rule.run(node, ctx);
             }
         }
 
-        ctx.into_message()
+        rules.into_iter().flat_map(|(_, ctx)| ctx.into_message()).collect::<Vec<_>>()
     }
 
     /// # Panics
     pub fn print_rules<W: Write>(writer: &mut W) {
-        let default_rules =
-            Linter::default().rules.into_iter().map(|(name, _)| name).collect::<FxHashSet<&str>>();
+        let default_rules = Linter::default()
+            .rules
+            .into_iter()
+            .map(|rule| rule.name())
+            .collect::<FxHashSet<&str>>();
 
         let rules_by_category = RULES.iter().fold(
             FxHashMap::default(),