perf(linter/plugins): pre-populate cache of EnterExit objects at startup#20194
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Pull request overview
This PR is a performance optimization for the visitor compilation phase in the JS plugin system. Instead of lazily growing the EnterExit object cache in finalizeCompiledVisitor on each file, all EnterExit objects (one per non-leaf AST node type) are allocated together at module startup. This improves memory locality by ensuring the objects — which are heavily accessed during AST traversal — are allocated contiguously and are more likely to be grouped together when V8 promotes them from "new space" to "old space", reducing L1 cache misses. This continues the performance work started in PR #20187.
Changes:
- Pre-populate
enterExitObjectCachewith all neededEnterExitobjects at module startup (matchingNON_LEAF_NODE_TYPES_COUNT). - Remove the now-redundant
whileloop fromfinalizeCompiledVisitorthat was previously needed to ensure cache capacity. - Remove the now-redundant
debugAssertfromresetCompiledVisitorthat guarded cache size, and remove the corresponding pre-condition requirement from its JSDoc.
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…artup (#20194) Perf optimization to visitor compilation. Continuation of #20187. Instead of populating the cache of `EnterExit` objects in `finalizeCompiledVisitor`, populate it in full at process startup. The main gain is that it makes these objects, which are heavily accessed during AST walk, more likely to be grouped together in memory, reducing L1 cache misses, and consuming less L1 cache.
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# Oxlint ### 🚀 Features - 04a5ce0 oxlint: Support `vite.config.ts` `.lint` field (#20214) (leaysgur) - 1735215 linter: Implement `react/no-clone-element` rule. (#20129) (connorshea) - 68e6f6f linter: Implement `react/no-react-children` rule. (#20104) (connorshea) - fe3b32e linter/plugins: Add `oxlint-plugin-eslint` package (#20009) (overlookmotel) ### 🐛 Bug Fixes - 05f6a09 linter/no-inline-comments: Deserialize rule options with serde (#20207) (camc314) - c7eb09d linter/default-case: Deserialize rule options with serde (#20206) (camc314) - f85e16c linter/plugins: Fix types for visitor compilation (#20203) (overlookmotel) - 44e24e0 linter/exhaustive-deps: Ignore type-only typeof deps (#20201) (camc314) - 0b04998 linter/no-fallthrough: Deserialize rule options with serde (#20192) (camc314) - a1031cb linter/new-cap: Deserialize rule options with serde (#20161) (camc314) - ad27fd6 linter: Add help messages to import plugin diagnostics (#20158) (John Costa) - 1340307 linter/plugins: Ensure `after` hooks always run (#20167) (overlookmotel) - c4812ec linter/plugins: Reset visitor compilation state if error during compilation (#20166) (overlookmotel) - 887eecc linter/plugins: Add license notice to `oxlint-plugin-eslint` package (#20164) (overlookmotel) - e1713a4 linter/plugins: Include common chunks in `oxlint-plugin-eslint` package (#20163) (overlookmotel) - a9acb2b linter: Check `globals` entry for `no-undef`, only check es2026 globals for `no-extend-native` and `no-constant-binary-expression` (#20089) (Sysix) - 5559f0d linter/no-unused-vars: `reportUsedIgnorePattern` should not report used rest siblings (#20108) (Don Isaac) - de7c0e2 linter/plugins: Correct error message for `markVariableAsUsed` (#20152) (overlookmotel) ### ⚡ Performance - 3a86427 linter/plugins: Pre-populate cache of `EnterExit` objects at startup (#20194) (overlookmotel) - d243391 linter/plugins: Replace arrays with `Uint8Array`s (#20190) (overlookmotel) - 8742f8b linter/plugins: Pre-populate cache of `VisitProp` objects (#20189) (overlookmotel) - 3061acb linter/plugins: Pre-populate cache of `EnterExit` objects (#20187) (overlookmotel) - c73912b linter/plugins: Free visit functions earlier (#20186) (overlookmotel) - d9f8ff4 linter/plugins: Faster reset of visitor state (#20185) (overlookmotel) - 42aff15 oxlint/lsp: Avoid computing diagnostics for non invoked code actions requests (#20080) (Sysix) ### 📚 Documentation - a080650 linter/plugins: Fix documentation of visitor compilation (#20202) (overlookmotel) - 542a04a linter: Add a link to the cyclomatic complexity Wikipedia article in `eslint/complexity` (#20174) (connorshea) # Oxfmt ### 🚀 Features - 95943aa oxfmt: Support `vite.config.*` `.fmt` field (#20197) (leaysgur) - 172fc07 oxfmt: .js/.ts config file support (#20135) (leaysgur) ### 🐛 Bug Fixes - e483569 oxfmt: Avoid double-escaping in css-in-js (#20211) (leaysgur) Co-authored-by: leaysgur <6259812+leaysgur@users.noreply.github.com>
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Perf optimization to visitor compilation. Continuation of #20187.
Instead of populating the cache of
EnterExitobjects infinalizeCompiledVisitor, populate it in full at process startup.The main gain is that it makes these objects, which are heavily accessed during AST walk, more likely to be grouped together in memory, reducing L1 cache misses, and consuming less L1 cache.