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…ys, and the handwritten C++ headers Shell: the cd, echo, exit, and export builtins each kept a private State enum that was written on every transition and never read. Remove the field, the enum, and the assignments. ParsedShellScript stored a weak JsRef to its own JS wrapper that nothing read. bun_core: strings::split_once and strings::rsplit_once have no callers. windows_sys: the NtReadFile, NtWriteFile, FillConsoleOutputAttribute and FillConsoleOutputCharacterW declarations are unused duplicates. The windows shim and bun_core::Progress declare their own. C++: the Encoding__* constants, BunPluginTargetMax, the ArrayBufferSink typedef, and the __NR_clone3 macro (the asm stubs hard-code 435) have no references. Also drop pub use re-exports that nothing imports (HTMLImportManifest, MetafileBuilder, JSCScheduler, jsx Defaults, and the node_fs async task types, which become pub(crate)), and a commented-out block in the util/inspect README that documents an export Bun never had.
WalkthroughChangesThe pull request narrows public API exports, removes unused platform declarations, simplifies shell builtin state handling, removes a Shell and API cleanup
Suggested reviewers: Merge Risk: 🔵 Low · up to The changes are otherwise localized cleanup, but several new shell tests require empty stderr even in builds that may emit benign diagnostics, so they are mergeable with owner awareness or a follow-up to relax those assertions. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
Full details: Title checkExplanation The title clearly identifies the dead-code cleanup in the shell builtins, Windows system declarations, and handwritten C++ headers. It omits some Rust re-export and documentation changes, but it accurately describes major parts of the pull request. Full details: Description checkExplanation The description provides detailed problem, fix, verification, and background information. Although it does not use the exact template headings, it covers the required purpose and validation details, including cross-platform checks and tests. Comment |
Cover the error and listing paths of the cd and export shell builtins: too many arguments, a missing directory, a file target, the || branch after a failed cd, cd -, export with and without a value, and the sorted listing that export prints with no arguments.
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clippy.toml names them as the replacement for str::split_once, str::rsplit_once, str::rsplitn and the bstr split_once_str family, so the lint's suggested fix has to keep compiling.
robobun
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Actionable comments posted: 1
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Inline comments:
In `@test/js/bun/shell/commands/cd.test.ts`:
- Line 12: Remove the empty-stderr assertions from the success tests in
test/js/bun/shell/commands/cd.test.ts at lines 12-12 and 21-21, and
test/js/bun/shell/commands/export.test.ts at lines 6-6, 10-10, 16-16, 22-22,
32-32, and 41-41. Leave non-empty stderr assertions in failure tests unchanged.
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📒 Files selected for processing (16)
src/bundler/HTMLImportManifest.rssrc/bundler/LinkerContext.rssrc/js/internal/util/README.mdsrc/jsc/bindings/bun-spawn.cppsrc/jsc/bindings/headers-handwritten.hsrc/jsc/event_loop.rssrc/options_types/jsx.rssrc/runtime/node/node_fs.rssrc/runtime/shell/ParsedShellScript.rssrc/runtime/shell/builtin/cd.rssrc/runtime/shell/builtin/echo.rssrc/runtime/shell/builtin/exit.rssrc/runtime/shell/builtin/export.rssrc/windows_sys/externs.rstest/js/bun/shell/commands/cd.test.tstest/js/bun/shell/commands/export.test.ts
💤 Files with no reviewable changes (8)
- src/jsc/event_loop.rs
- src/bundler/LinkerContext.rs
- src/options_types/jsx.rs
- src/js/internal/util/README.md
- src/jsc/bindings/bun-spawn.cpp
- src/windows_sys/externs.rs
- src/runtime/shell/builtin/echo.rs
- src/jsc/bindings/headers-handwritten.h
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Updated 5:11 AM PT - Aug 28th, 2026
❌ @robobun, your commit de6b5a6 has 2 failures in
🧪 To try this PR locally: bunx bun-pr 40762That installs a local version of the PR into your bun-40762 --bun |
…e positive The x64 baseline static scan decoded one RDPMC out of the embedded opcode id at the start of llint_op_jmp_wide32 after the .text layout shifted. Same data-in-.text false positive as the two existing LLInt entries; blanket pass because the misdecoded bytes move with link layout.
iced-x86 tags RDPMC (0F 33, Pentium Pro) with its own CpuidFeature, which NEHALEM_ALLOWED did not list, so a data-in-text decode of it in llint_op_jmp_wide32 was reported as a violation. Allow the feature instead of allowlisting the symbol: the instruction decodes on Nehalem, and the symbol keeps the same scrutiny as its llint_op_* siblings.
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LGTM — thanks for swapping the llint_op_jmp_wide32 blanket-pass allowlist entry for the RDPMC addition to NEHALEM_ALLOWED, and for keeping strings::split_once/rsplit_once.
Re-checked: the removed pub use re-exports (MetafileBuilder, JSCScheduler, HTMLImportManifest, jsx Defaults, the node_fs async task types) have no remaining consumers via those paths — build_command.rs already imports metafile_builder directly. The ArrayBufferSink void* typedef is distinct from every remaining ArrayBufferSink reference (all Rust struct / C++ class / enum variant, none the typedef). ParsedShellScript.this_jsvalue had no reader (the Interpreter.this_jsvalue field, which is read, is untouched). No state_mut/BuiltinState references remain in cd/exit/export after the field removal.
Extended reasoning...
Overview
This PR is a dead-code sweep touching 17 files: write-only State enum fields removed from four shell builtins (cd, echo, exit, export), the never-read this_jsvalue: JsRef self-backref dropped from ParsedShellScript, seven node_fs async-task types narrowed from pub to pub(crate) and dropped from the module re-export list, four unused pub use re-exports deleted (HTMLImportManifest, MetafileBuilder, JSCScheduler, jsx Defaults), unused C++ constants/typedefs removed from headers-handwritten.h and bun-spawn.cpp, four unused Windows extern declarations removed from windows_sys/externs.rs, a stale commented-out HTML block stripped from a README, and RDPMC added to NEHALEM_ALLOWED in the baseline-static verifier. Two new TestBuilder-based test files cover the cd and export builtins whose state machines changed.
Security risks
None. All deletions are of unreferenced declarations, write-only fields, or re-export aliases. No auth, crypto, permission, or input-validation code is touched. The RDPMC addition is to a build-time CI verifier's baseline feature allowlist; RDPMC is a Pentium Pro-era instruction and genuinely available on Nehalem, so this cannot mask a real baseline violation.
Level of scrutiny
Low-to-medium. The methodology (flip pub → pub(crate), read rustc dead_code output across all five target triples) is sound and the PR description enumerates what was intentionally kept. I grepped every removed public symbol for remaining consumers: the MetafileBuilder re-export is superseded by a direct linker_context::metafile_builder import in build_command.rs; the ArrayBufferSink void* typedef is unrelated to the ~40 remaining hits (all Rust struct, C++ class, or enum variant); Encoding__*, BunPluginTargetMax, and __NR_clone3 have zero references; the shell builtins have no remaining state_mut/BuiltinState uses in the three files that dropped the import. The ParsedShellScript.this_jsvalue removal does not affect Interpreter.this_jsvalue, which is still read and written.
Other factors
Both concerns I raised on earlier pushes have been addressed exactly as suggested: commit 054f131 restored strings::split_once/rsplit_once (which clippy.toml names as the mandated replacement for denied std/bstr methods), and commit 1a59d7a replaced the llint_op_jmp_wide32 blanket-pass allowlist entry with the structural fix — adding CpuidFeature::RDPMC to NEHALEM_ALLOWED — so the LLInt symbol group keeps its "multi-feature leak still fails" property. The new test files follow the existing test/js/bun/shell/commands/*.test.ts per-builtin pattern and use the TestBuilder harness. No CODEOWNERS paths are touched. The one third-party review thread (coderabbitai on cd.test.ts) was resolved by a non-author. Exit reason was dry_streak.
Dropping them makes NewAsyncCpTask crate-private, which puts its shelltask Option under mordant's always_unwrapped_option lint.
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LGTM — both earlier points (the strings::split_once clippy-replacement deletion and the llint_op_jmp_wide32 blanket allowlist entry) were addressed by reverting the string helpers and adding CpuidFeature::RDPMC to NEHALEM_ALLOWED at the right layer.
What was reviewed:
- Grepped every removed re-export/extern/constant (
MetafileBuilder,JSCScheduler,HTMLImportManifest,jsx::Defaults,NtReadFile/NtWriteFile,FillConsoleOutput*,Encoding__*,__NR_clone3,BunPluginTargetMax,ArrayBufferSink) — remaining callers all go through the surviving direct path or a locally-declared duplicate, none through the deleted alias. ParsedShellScript.this_jsvaluewas a weakJsRefwith no reader; theInterpreter.this_jsvaluethat actually drives promise resolution andhasPendingActivityis untouched.- Shell builtin
Stateremovals: confirmed nostate_mutcalls remain incd/exit/export;echokeepsBuiltinStatefor itsoutputfield.
Extended reasoning...
Overview
This PR is a dead-code sweep touching shell builtins (cd, echo, exit, export — write-only State enums), ParsedShellScript (unused weak self-backref), unused pub use re-exports in the bundler/jsc/options crates, unused C++ header constants and a fallback macro, duplicate Windows extern declarations, a stale README comment block, and a one-line addition of RDPMC to the baseline-static verifier's Nehalem feature set. Two new TestBuilder-based test files cover cd and export. Since the last review round, the author reverted the bun_core::strings::{split_once,rsplit_once} deletion (which the clippy config names as required replacements), reverted the node_fs async-task re-export tightening, and replaced the blanket llint_op_jmp_wide32 allowlist entry with the structural fix of adding RDPMC to NEHALEM_ALLOWED — exactly the layer the earlier comment pointed at.
Security risks
None. No auth, crypto, network, or input-parsing paths are touched. The only behavior-adjacent change is widening the baseline verifier's allowed feature set by one Pentium-Pro-era instruction (RDPMC, 0F 33), which genuinely executes on Nehalem, so this cannot mask a real SIGILL regression. Everything else is deletion of symbols with no remaining consumer.
Level of scrutiny
Low-to-moderate, focused on "does anything still reference the deleted thing." Per REVIEW.md, public items escape dead-code lints so each removal was grepped manually across src/: build_command.rs and bundle_v2.rs reach metafile_builder via crate::linker_context::metafile_builder (not the removed LinkerContext::MetafileBuilder alias); dispatch.rs uses bun_jsc::jsc_scheduler directly; Chunk.rs calls the free format_escaped_json/write_escaped_json on the html_import_manifest module, not the re-exported struct; Progress.rs and bun_shim_impl.rs declare their own copies of the removed Windows externs; no hits at all for the C++ constants or jsx::Defaults. The removed ParsedShellScript.this_jsvalue was a weak JsRef (so it never rooted anything) and the Interpreter's separately-owned this_jsvalue field — which is what promise resolution and pending-activity read — is unchanged.
Other factors
No CODEOWNERS pattern matches the changed files. The new tests follow the existing per-builtin file convention in test/js/bun/shell/commands/, use isWindows for platform branching, and avoid sleeps/ports. There are no outstanding CHANGES_REQUESTED reviews; the coderabbitai inline thread was resolved by a non-author. The hunt exited on dry_streak with no findings.
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Status: the diff is complete and the change set passes everywhere it is exercised.
None of the red tests touch the files in this PR (shell builtins, |
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LGTM — both earlier concerns are addressed (strings::split_once/rsplit_once kept, RDPMC moved into NEHALEM_ALLOWED rather than a blanket allowlist entry), and the node_fs re-exports were restored.
Grepped every removed symbol: Encoding__*/BunPluginTargetMax/__NR_clone3 have zero hits in src/; the removed NtReadFile/NtWriteFile/FillConsoleOutput* externs are separately declared by their only callers (bun_shim_impl.rs, Progress.rs); MetafileBuilder/JSCScheduler/html_import_manifest::HTMLImportManifest/jsx::Defaults re-exports have no consumers on the removed path. ParsedShellScript.this_jsvalue had no reader (the Interpreter.this_jsvalue field is unrelated and untouched). The four builtins' removed State enums were write-only in every case; echo correctly keeps output and its state_mut calls. New cd.test.ts/export.test.ts follow the existing per-command file pattern in test/js/bun/shell/commands/.
Extended reasoning...
Overview
This PR is a dead-code sweep across the shell interpreter, C++ handwritten headers, windows_sys externs, and a handful of unused pub use re-exports, plus one additive change to the verify-baseline-static scanner (adding CpuidFeature::RDPMC to the Nehalem baseline set) and two new shell-builtin test files. Over the PR's lifetime the author reverted three deletions in response to review: strings::split_once/rsplit_once (kept because clippy.toml names them as the required replacement), the node_fs async-task re-exports (kept to avoid tripping a downstream lint), and the blanket allowlist entry for llint_op_jmp_wide32 (replaced by the structural fix of adding RDPMC to NEHALEM_ALLOWED).
Security risks
None. No auth, crypto, network, or input-parsing paths are touched. The only additive runtime-adjacent change is removing write-only State fields from four shell builtins — the values were never read, so control flow is unchanged. ParsedShellScript.this_jsvalue was a weak self-backref with no reader; dropping it removes an unused JsRef, not a GC root anything depended on. The __NR_clone3 macro removal is safe because both asm stubs in bun-spawn.cpp hard-code 435 directly.
Level of scrutiny
Low-to-moderate, appropriate for mechanical deletions. Per REVIEW.md, public items escape dead-code lints, so I manually grepped each removed symbol across src/ (including cfg-gated Windows code) and confirmed zero remaining consumers on the removed paths. The MetafileBuilder re-export removal is safe because build_command.rs imports via the direct bun_bundler::linker_context::metafile_builder path; JSCScheduler's only remaining hit is its #[path] module declaration. The ArrayBufferSink typedef in headers-handwritten.h was a void* alias unrelated to the real class in Sink.h. RDPMC (opcode 0F 33) has existed since the Pentium Pro, so adding it to the Nehalem allowed-feature set is factually correct and preserves the scanner's ability to flag genuine post-Nehalem leaks in LLInt symbols.
Other factors
The new test files follow the established one-file-per-builtin convention already used by echo.test.ts, exit.test.ts, basename.test.ts, etc. in test/js/bun/shell/commands/, so they are placed correctly rather than violating the "add to existing file" rule. The Windows-branched stderr check in cd.test.ts uses isWindows from harness. No CODEOWNERS paths are touched. No outstanding third-party CHANGES_REQUESTED reviews; the one coderabbitai inline thread was resolved by a non-author. Exit reason was dry_streak.
Problem
src/js/node,internal,builtins,bun), the root C++ bindings, and every Rust crate. Most areas are clean after the earlier sweeps. What remains is a set of small items thatrgand rustc both confirm nothing references.pubitem in the workspace topub(crate)and reading rustc'sdead_codeoutput on linux, Windows (x64 and arm64), macOS, and FreeBSD. Only items dead on every target are removed here.Fix
cd,echo,exit,export(src/runtime/shell/builtin/*.rs): each kept a privateStateenum that was written on every transition and never read. The field, the enum, and the assignments are gone.ParsedShellScript.this_jsvalue(a weakJsRefto its own wrapper) had no reader.windows_sysdeclaredNtReadFile,NtWriteFile,FillConsoleOutputAttribute,FillConsoleOutputCharacterWa second time: the Windows shim andbun_core::Progressdeclare and use their own.headers-handwritten.h,bun-spawn.cpp): the nineEncoding__*constants,BunPluginTargetMax, theArrayBufferSinktypedef, and the__NR_clone3macro (both asm stubs hard-code435) have no references in C++, Rust, TS, or generated code.pub usere-exports removed:HTMLImportManifest,MetafileBuilder,JSCScheduler, and jsxDefaults. One stale commented-out block insrc/js/internal/util/README.mddocuments astylizeWithHTMLexport Bun never had.cargo check --workspaceon x86_64-linux, x86_64 and aarch64 Windows, aarch64 macOS, x86_64 FreeBSD.bun bdbuilds. Newtest/js/bun/shell/commands/cd.test.tsandexport.test.tscover the error and listing paths of the two builtins whose state machines changed.test/js/bun/shell/bunshell.test.ts,bunshell-instance.test.ts,lazy.test.ts,exec.test.ts, theecho/exitcommand tests, andtest/js/bun/spawn/spawn.test.tspass.Background
dead_codeandunreachable_pub, so private unused code cannot exist. Dead code can only hide behindpub(rustc treatspubas a crate API root and skips it). Making an itempub(crate)puts it back under analysis.multi_array_columns!structs are schemas: rustc reports their fields as "never read" because the data lives in column vectors. Those were reviewed and kept.#[repr(u8)]enums that mirror a C++ or lockfile enum (SSRKind,Origin,napi_status, c-ares codes) keep variants Rust never constructs. Kept.Notes
Overlap with open dead-code PRs was checked per symbol. Deletions that #40232, #40367, #40557, #40172, #40525, #39929 already carry (for example
ExportRenamer,has_termination_request,AllStmts,ColorCode::Pink,GetFileAttributesExW,us_socket_pair,lshpack.well_know) were dropped from this PR.bun_core::strings::split_once/rsplit_oncehave no callers, butclippy.tomlnames them as the replacement for the deniedstr::split_once/rsplit_once/rsplitnandbstrsplit_once_strmethods, so they stay.The
node_fsre-exports ofAsyncFSTask,CpSingleTask,NewAsyncCpTask,UVFSRequest, and theResultListEntrytypes are also unused, but removing them makesNewAsyncCpTaskcrate-private and itsshelltaskOptiontrips mordant'salways_unwrapped_optionlint, so they stay too.Items rustc reports as dead that this PR leaves alone on purpose (follow-up candidates, not certain enough to delete):
src/react_compiler/compile_result.rs:LoggerEvent,LoggerSourceLocation,CompilerErrorDetailInfo,LoggerSuggestionInfo,DebugLogEntryand friends (about 130 lines) are never constructed. The file carries#![allow(unreachable_pub, reason = "ported types consumed by sibling stubs not yet wired")], so it reads as in-progress porting work.src/parsers/yaml.rs: theLatin1andUtf16Encodingimpls and theirEncodingKindmatch arms. OnlyParser<Utf8>is instantiated. The generic design looks deliberate.src/jsc/bindgen.rs:BindgenString,BindgenNull,BindgenStrongAny,ExternTaggedUnion2,ExternUnion2, and theBindgentrait are unused by current.bind.tsinputs but are emitted bysrc/codegen/bindgenv2.src/runtime/dns_jsc/dns.rsDNSRequestOwner::Prefetch,src/install/PackageManager/PackageManagerEnqueue.rsDependencyToEnqueue::Pending: variants never constructed, each with one or two match arms.BuiltinInput::ArrayBuf.i,PromptBehaviour::Once.removed_count,UserOptions.allocations(owns allocations, itsDropmatters),AsyncReaddirRecursiveTask.args.Scans that found nothing to delete:
src/js/node/**andsrc/js/thirdparty/**(every top-level declaration, class method, private member, and primordial has a reader),src/js/internal/**andsrc/js/builtins/**(every builtin is wired throughWebCoreJSBuiltins.hor a$nameuse),src/jsc/bindings/*.cpp|*.hat the root (the remaining unreferencedJSC__*externs are already in #40232), and a heuristic unused-Cargo-dependency pass (the one hit,bytemuckinbun_paths, is already in #40525).no test proof · iteration 5 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/bun/shell/commands/cd.test.ts