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refactor: drop redundant program scope enter/leave in finalizer#10049

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06-30-refactor_drop_redundant_program_scope
Jul 1, 2026
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refactor: drop redundant program scope enter/leave in finalizer#10049
graphite-app[bot] merged 1 commit into
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06-30-refactor_drop_redundant_program_scope

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What

In ScopeHoistingFinalizer::visit_program, removes the manual enter_scope / leave_scope pair wrapped around walk_mut::walk_program, plus the now-unused semantic::ScopeFlags import.

Why

walk_mut::walk_program already calls enter_scope and leave_scope internally, using the exact same scope-flag computation (ScopeFlags::Top, with StrictMode added when the program is strict or has a "use strict" directive) and the same scope_id. The manual wrapper duplicated that, so enter_scope / leave_scope ran twice per program.

The duplication was harmless because the finalizer's enter_scope / leave_scope only derive two boolean states (TopLevel, IsRootLevel) via scope_stack.iter().rev().all(...) predicates, and pushing the same Top flag twice does not change an .all() result. Nothing reads the stack depth or length. Removing the redundant wrapper keeps behavior identical while dropping dead nesting.

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@shulaoda shulaoda force-pushed the 06-30-refactor_drop_redundant_program_scope branch from cc02dca to ffc849b Compare June 30, 2026 20:51
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Merging this PR will improve performance by 3.01%

⚡ 1 improved benchmark
✅ 6 untouched benchmarks
⏩ 10 skipped benchmarks1

Performance Changes

Benchmark BASE HEAD Efficiency
bundle@multi-duplicated-top-level-symbol 257.6 ms 250 ms +3.01%

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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 06-30-refactor_drop_redundant_program_scope (ffc849b) with main (e041753)2

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Footnotes

  1. 10 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.

  2. No successful run was found on main (b240d83) during the generation of this report, so e041753 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report.

shulaoda commented Jul 1, 2026

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Merge activity

  • Jul 1, 2:51 AM UTC: The merge label 'graphite: merge-when-ready' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
  • Jul 1, 2:51 AM UTC: shulaoda added this pull request to the Graphite merge queue.
  • Jul 1, 2:59 AM UTC: Merged by the Graphite merge queue.

### What

In `ScopeHoistingFinalizer::visit_program`, removes the manual `enter_scope` / `leave_scope` pair wrapped around `walk_mut::walk_program`, plus the now-unused `semantic::ScopeFlags` import.

### Why

`walk_mut::walk_program` already calls `enter_scope` and `leave_scope` internally, using the exact same scope-flag computation (`ScopeFlags::Top`, with `StrictMode` added when the program is strict or has a `"use strict"` directive) and the same `scope_id`. The manual wrapper duplicated that, so `enter_scope` / `leave_scope` ran twice per program.

The duplication was harmless because the finalizer's `enter_scope` / `leave_scope` only derive two boolean states (`TopLevel`, `IsRootLevel`) via `scope_stack.iter().rev().all(...)` predicates, and pushing the same `Top` flag twice does not change an `.all()` result. Nothing reads the stack depth or length. Removing the redundant wrapper keeps behavior identical while dropping dead nesting.
@graphite-app graphite-app Bot force-pushed the 06-30-refactor_drop_redundant_program_scope branch from ffc849b to cf91eb3 Compare July 1, 2026 02:55
@graphite-app graphite-app Bot merged commit cf91eb3 into main Jul 1, 2026
34 checks passed
@graphite-app graphite-app Bot deleted the 06-30-refactor_drop_redundant_program_scope branch July 1, 2026 02:59
@rolldown-guard rolldown-guard Bot mentioned this pull request Jul 1, 2026
shulaoda added a commit that referenced this pull request Jul 1, 2026
## [1.1.4] - 2026-07-01

### 🚀 Features

- disable `experimental.lazyBarrel` by default (#10071) by @shulaoda

### 🐛 Bug Fixes

- dev: disable lazy barrel in dev mode (#10060) by @shulaoda
- generate: keep full JSON interface under preserveModules namespa… (#10056) by @IWANABETHATGUY
- check finalize_other_specifiers in its own Debug attribute (#10032) by @shulaoda
- serialize the KeepAssign unused minify option as "keep_assign" (#10031) by @shulaoda
- keep fragments after the newline fragment in MagicString::last_line (#10023) by @shulaoda
- generate: undeclared JSON named exports under preserveModules (#10020) (#10027) by @IWANABETHATGUY
- deconflict: rename CJS-wrapped locals that shadow chunk-root bindings (#9921) by @IWANABETHATGUY
- rolldown: keep entry facade when a shared chunk holds another entry's module (#9997) by @hyf0
- treeshake: also bail JSON default split when the object escapes (#9996) by @IWANABETHATGUY
- don't classify await in a strict-mode function as top-level await (#9987) by @shulaoda
- avoid spurious leading newline in addon hooks (banner/footer/intro/outro) (#9989) by @shulaoda
- handle JSON default mutation bailouts (#9972) by @TheAlexLichter
- plugin: make lazy hook metadata enumerable (#9991) by @TheAlexLichter
- dev: make init errors in lazy-compiled modules catchable (#9981) by @h-a-n-a
- treeshake: keep computed-key side effects on namespace member access (#9986) by @shulaoda
- binding: validate replace plugin delimiters length instead of panicking (#9984) by @shulaoda
- reconstruct nested rest patterns in into_expression (#9980) by @IWANABETHATGUY
- reconstruct rest patterns as spread in into_expression (#9976) by @shulaoda
- preserve export keyword on multi-declarator exports under keepNames (#9974) by @shulaoda
- deterministically keep the shortest name for deduplicated assets (#9948) by @x1024
- treeshake: apply @__NO_SIDE_EFFECTS__ to cross-chunk namespace calls (#9960) by @IWANABETHATGUY

### 🚜 Refactor

- drop redundant program scope enter/leave in finalizer (#10049) by @shulaoda
- deconflict: extract collect_chunk_scope_captured_names (#10006) by @IWANABETHATGUY
- unify pre-scan multi-declarator split into one decision site (#9982) by @IWANABETHATGUY
- common: return bool from SymbolRef::is_not_reassigned (#9962) by @IWANABETHATGUY

### 📚 Documentation

- rolldown: remove outdated comment for removing parenthesized expression (#10062) by @Dunqing
- use GitHub-flavored alert for Etiquette note in contribution guide (#10012) by @IWANABETHATGUY
- replace: explain the delimiters left and right boundaries (#9985) by @shulaoda
- ast-mutation: remove stale Address Use section after pre-scan refactor (#9983) by @IWANABETHATGUY
- remove fathom (#9968) by @mdong1909
- contribution-guide: code-format main branch references (#9966) by @IWANABETHATGUY
- contribution-guide: fix stale REPL note and tidy wording (#9957) by @hyf0
- contribution-guide: clarify when to discuss before opening a PR (#9955) by @hyf0

### ⚡ Performance

- disable preserve_parens across all parse paths (#10057) by @Dunqing
- common: inline declared_symbols with SmallVec (#9920) by @IWANABETHATGUY
- common: pack TaggedSymbolRef into 8 bytes (#9919) by @IWANABETHATGUY
- sourcemap: skip newline scan on the no-sourcemap join fast path (#9936) by @Boshen

### 🧪 Testing

- dev: error in lazy module should be catchable (#9975) by @sapphi-red
- dev: reject unknown lazy compile modules (#9969) by @sapphi-red

### ⚙️ Miscellaneous Tasks

- deps: update actions/cache action to v6 (#10001) by @renovate[bot]
- trigger vite ecosystem-ci from PR comments (#10058) by @shulaoda
- deps: update napi to v3.10.0 (#10063) by @renovate[bot]
- remove unused From impl for RolldownLabelSpan (#10055) by @shulaoda
- remove dead Diagnostic::with_kind method (#10054) by @shulaoda
- remove unused StatementExt methods (#10053) by @shulaoda
- remove unused ExpressionExt methods (#10052) by @shulaoda
- remove commented-out re_export_all_names field (#10051) by @shulaoda
- deps: update pnpm to v11.9.0 (#10047) by @renovate[bot]
- remove the unused BindingGenerateHmrPatchReturn napi type (#10034) by @shulaoda
- remove the dead inline_entry_chunk_wrapping scaffolding (#10037) by @shulaoda
- deps: bump oxc_resolver to 11.22.0 (#10045) by @Boshen
- remove never-constructed MatchImportKind::_Ignore variant (#10041) by @shulaoda
- remove the unused ScheduledBuild napi struct (#10033) by @shulaoda
- remove dead compute_hmr_update_single method (#10040) by @shulaoda
- drop the redundant visited.insert in manual code splitting (#10038) by @shulaoda
- remove the dead output_assets vector in render_chunk_to_assets (#10036) by @shulaoda
- remove the unused From<String>/Display impls for BindingLogLevel (#10035) by @shulaoda
- deps: upgrade oxc to 0.138.0 and migrate to per-type AST construction (#10018) by @shulaoda
- deps: update rust crates (#9911) by @renovate[bot]
- deps: update test262 submodule for tests (#10016) by @rolldown-guard[bot]
- deps: update github actions (#9999) by @renovate[bot]
- deps: update npm packages (#10000) by @renovate[bot]

### ◀️ Revert

- "fix(plugin): make lazy hook metadata enumerable (#9991)" (#10005) by @shulaoda

### ❤️ New Contributors

* @x1024 made their first contribution in [#9948](#9948)

Co-authored-by: shulaoda <165626830+shulaoda@users.noreply.github.com>
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