perf(react_compiler): replace all compiled functions in a single AST walk#24403
Merged
Merged
Conversation
Merging this PR will improve performance by 7.62%
|
| Mode | Benchmark | BASE |
HEAD |
Efficiency | |
|---|---|---|---|---|---|
| ⚡ | Simulation | react_compiler[kitchen-sink.tsx] |
289.3 ms | 268.8 ms | +7.62% |
Tip
Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.
Comparing perf/react-compiler-batch-fn-replace (b382f0c) with main (71945a2)
Footnotes
-
61 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩
Member
Author
Merge activity
|
…walk (#24403) ## What `OxcReplaceFnVisitor` walked the entire program from the root **once per compiled function** — O(replacements × AST size). This collects all non-gated replacements into an `FxHashMap<ScopeId, &CodegenFunction>` and applies them in a **single traversal**, with a `remaining` counter that stops the walk early once every target has been applied. ## Why it's equivalent - Non-gated replacement is a pure **in-place field edit** of a function node — it never inserts or removes `program.body` statements — so running the whole batch before the outlined-declaration insertion and gating loop (which *do* restructure `program.body`) cannot affect their results. - The **gated** path is untouched: it stays in the loop because it replaces a function with a `gating() ? … : …` conditional and clones the *original* body. Each replacement is gated or non-gated, never both. - A top-down walk reaches an outer function before any nested one and does not recurse into a replaced node, preserving the "outer wins, inner clobbered" behavior the N separate walks already produced — independent of list order or nesting. ## Verification - `cargo test -p oxc_react_compiler`: the 1806-fixture snapshot corpus passes **unchanged** (byte-identical output), plus all transform integration tests. Net: N full-program traversals → 1, scaling with the number of compiled functions per file.
graphite-app
Bot
force-pushed
the
perf/react-compiler-batch-fn-replace
branch
from
July 12, 2026 15:14
b382f0c to
dce0f29
Compare
Boshen
added a commit
that referenced
this pull request
Jul 14, 2026
### 🚀 Features - 616bfa2 minifier: Remove unreachable code after terminating statements (#24441) (Dunqing) - ddab89a data_structures: Add `likely` and `unlikely` functions (#24368) (overlookmotel) - a3a39f9 react_compiler: Implement enableEmitHookGuards codegen (#24329) (Boshen) - b79eef7 minifier: Apply De Morgan's law to negated comparison chains in jump guards and loop tests (#24279) (Dunqing) - 34ff7b4 minifier: Drop write-only property assignments to unused local bindings by default (#24112) (Dunqing) - 1b829d8 semantic: Record const enums in EnumData (#24268) (Dunqing) - ba0944c semantic: Add `Scoping::set_symbol_span` (#24221) (camc314) ### 🐛 Bug Fixes - 7d33363 minifier: Preserve guaranteed throws from class heritage evaluation (#24349) (Dunqing) - 058a62f semantic: Track ambient contexts in `SemanticBuilder` (#24327) (camc314) - 721eb0b transformer/decorator: Scope accessor class binding (#24330) (camc314) - 1ebdce3 semantic: Allow reserved keywords in ambient declaration types (#24325) (camc314) - 460176a track-memory-allocations: Exclude arena chunks from Sys allocs (#24292) (Dunqing) - af4922b transformer: Clear lowered namespace redeclarations (#24300) (camc314) - ffd2765 semantic: Mark declared computed `MethodDefinition`s as type references (#24296) (camc314) - f17514b isolated-declarations: Emit const readonly fields as types (#24288) (camc314) - 40f769d minifier: Make `__proto__` write tracking execution-order independent (#24280) (Dunqing) - 6371fed transformer: Remove stale enum member bindings (#24272) (camc314) - f05dfab transformer: Correct symbol flags for lowered namespaces (#24271) (Dunqing) - 84eeb55 transformer: Correct symbol flags for lowered enums (#24269) (Dunqing) - c3057da transformer: Preserve generated class binding spans (#24220) (camc314) - 8260096 transformer: Correct span for lowered namespace symbol (#24222) (camc314) - 42d00d3 semantic: Mark declared class heritage as type references (#24237) (camc314) - 588d997 semantic: Mark TS `PropertyDefinition`s computed fields as type references (#24233) (camc314) - 9b95632 semantic: Mark computed method keys in `TSMethodSignature`s as type references (#24232) (camc314) ### ⚡ Performance - 5b26643 transformer_plugins: Dispatch global defines by trailing name (#23666) (Boshen) - dce0f29 react_compiler: Replace all compiled functions in a single AST walk (#24403) (Boshen) - f85f0d8 ast: Delegate inherited enum variants in clone_in and estree derives (#23555) (Boshen) - 3ff0234 allocator: Remove `unwrap` from `ReplaceWith` (#24365) (overlookmotel) - ab22e80 transformer: Fix Rust 1.97 performance regression (#24354) (camc314) - b47585c parser: Use `ReplaceWith` instead of `TakeIn` (#24018) (overlookmotel) - b227a06 minifier: Use `ReplaceWith` instead of `TakeIn` (#24017) (overlookmotel) Co-authored-by: Boshen <[email protected]>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
What
OxcReplaceFnVisitorwalked the entire program from the root once per compiled function — O(replacements × AST size). This collects all non-gated replacements into anFxHashMap<ScopeId, &CodegenFunction>and applies them in a single traversal, with aremainingcounter that stops the walk early once every target has been applied.Why it's equivalent
program.bodystatements — so running the whole batch before the outlined-declaration insertion and gating loop (which do restructureprogram.body) cannot affect their results.gating() ? … : …conditional and clones the original body. Each replacement is gated or non-gated, never both.Verification
cargo test -p oxc_react_compiler: the 1806-fixture snapshot corpus passes unchanged (byte-identical output), plus all transform integration tests.Net: N full-program traversals → 1, scaling with the number of compiled functions per file.