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opened 2026-11-03 13:39:20 +00:00 by bsakaguchi
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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/7105
Author: @kaoru0822-kitauji
Created: 10/25/2026
Status: ✅ Merged
Merged: 10/25/2026
Merged by: @kaoru0822-kitauji
Base:
main← Head:fix/5298-macho-symbol-names📝 Commits (1)
fd92e50fix(macho): derive the runtime name of each Mach-O symbol📊 Changes
12 files changed (+142 additions, -20 deletions)
View changed files
📝
.agents/skills/reverse-engineer-anything/references/native-and-artifacts.md(+3 -2)📝
docs/native-investigation.md(+20 -9)📝
src/contracts/managed/managedWorkflowExamples.ts(+1 -0)📝
src/domain/analysisView/machoView.test.ts(+2 -0)📝
src/domain/managed/managedNativeVerificationMatch.ts(+7 -5)➕
src/domain/native/machoSymbolName.test.ts(+49 -0)➕
src/domain/native/machoSymbolName.ts(+22 -0)📝
src/domain/native/nativeCallObservation.ts(+1 -1)📝
src/domain/native/nativeInspection.ts(+11 -0)📝
src/native/NativeMachoInspection.ts(+14 -2)📝
tests/boundary/mcp/nativeMachoSummaryMcp.test.ts(+2 -0)📝
tests/boundary/providers/native/nativeInventory.golden.test.ts(+10 -1)📄 Description
What broke:
inspect_machonames a Mach-O function by its symbol-table spelling (_main), but LLDB andobserve_native_callsuse the runtime spelling (main). A name copied from static output silently selected a different function (_mainresolved only to AppKit's-[_NSLegacyFilePromiseCoordinator _main]), so results from the two tools could not be joined by name.Fix:
namestays the exact symbol-table fact. Every export and import row gains a derivedruntime_name, produced by one shared owner (src/domain/native/machoSymbolName.ts) that removes the single leading underscore Darwin adds. Managed P/Invoke verification now uses that owner instead of its own underscore stripping.Risk: The change only adds a field. Evidence retained before this change parses with
runtime_name: null. Rows get larger: one measured 64-row import page of a Swift app grew 11,835 → 16,565 bytes.Summary
Fixes #5298
The issue's original coverage framing was withdrawn in #5299. The remaining defect is a naming mismatch between REA's static and runtime Mach-O outputs.
observe_native_callsalready documents that it does not translate breakpoint names (d397ac742), and that contract is unchanged here. What was missing is a static output that gives the runtime spelling, so callers had to apply the Darwin convention themselves.Problem and expected behavior
main.inspect_machoreports export_mainat0x1000004e0, andobserve_native_callsreports location symbolmainat file address0x1000004e0. The breakpoint{"kind":"function","name":"_main"}resolves one location in AppKit and none in the executable.observe_native_callsdirectly.Change and scope
machoRuntimeSymbolName(src/domain/native/machoSymbolName.ts). It removes exactly one leading_and leaves names without one (-[Class sel], local labels) unchanged. It returns null for a null name, an empty name, or a bare_. This matches what LLDB reported on this machine for C, C++, Swift and ObjC symbols (see Evidence).inspect_machoexport and import rows gainruntime_name, derived once in the producer (NativeMachoInspection.normalizeMacho). An ambiguous chained import (name: null) getsruntime_name: null.verify_managed_native_boundariespreviously stripped the underscore itself (normalizedSymbolName). That copy is removed; it now calls the shared owner on the retained rawname, so Evidence that predates the field still matches exactly as before.observe_native_callsfunction-breakpointnamedescription,docs/native-investigation.mdand the skill reference now point callers toruntime_name. The doc also explains that event/locationsymbolvalues are LLDB display names, demangled for C++ and Swift. Those values are joined throughbreakpoint_indexplus the requestname, or throughfile_addressplus the exportaddress.Contribution scope: an ordinary fix within existing boundaries; no maintainer scope decision is needed.
Contract and boundary impact
src/domain/native/machoSymbolName.ts(domain), used by the Mach-O producer (src/native/NativeMachoInspection.ts) and the managed matcher (src/domain/managed/managedNativeVerificationMatch.ts). The duplicated underscore stripping in the managed matcher was removed.inspect_machooutput schema addsruntime_name(string | null) toexports.items[]andimports.items[], and theinspect_analysis_viewMach-O rows carry it as well. The meaning of existing fields is unchanged. Theobserve_native_callsbreakpointnamedescription text changed.nameremains the exact source value.runtime_nameis derived and documented as such. For older Evidence it defaults to null, documented as "predates this field".docs:checkandmetadata:checkpassed locally. No committed build outputs.Expected effects:
Evidence and regression coverage
Tests added or updated:
src/domain/native/machoSymbolName.test.ts: C, Itanium__Z…, Swift_$s…and legacy__T0…,_OBJC_CLASS_$_…,__OBJC_$_…,objc_msgSend$…stubs,___stack_chk_fail; unchanged-[C sel],+[C sel],ltmp0,radr://…, leading space, case; null fornull,""and_.tests/boundary/providers/native/nativeInventory.golden.test.ts: the producer derivesruntime_namefor nm/dyld_info exports and imports, and gives null for an ambiguous chained import. This fails on base because the field is absent.tests/boundary/mcp/nativeMachoSummaryMcp.test.ts,src/domain/analysisView/machoView.test.ts: paged rows withruntime_namevalidate against the advertised MCP output schema and keep exact row shapes (export rows still precede import rows in the union).runtime_name(old Evidence shape)._open_nativestill verifies against importopen_native, and the underscore-declared import case still stays unresolved.Base reproduction (executed on
origin/main160d821ac, macOS arm64, LLDBlldb-2100.0.17.203, using the issue'sobjetivo.c): breakpointmain→ 35 locations includingobjetivo:main;_main→ 1 location,AppKit:-[_NSLegacyFilePromiseCoordinator _main];mainwithmodule: objetivo→objetivo:main.inspect-machoexport:_mainat0x1000004e0.Real-app check with this branch (built CLI). Each binary was compiled locally. Every function export's
runtime_nameand rawnamewere passed as module-scoped breakpoints:name→runtime_nameruntime_namename_main→main,_rea_add→rea_addfile_addressequals the exportaddress__ZN3rea3addEii→_ZN3rea3addEii,_c_add→c_addrea::add(int, int)), event hit_$s5swbin6reaAddyS2i_SitF→$s5swbin6reaAddyS2i_SitF_main→main;-[ReaThing addA:b:]is unchanged (LLDB names it the same way)In the first ObjC run the
mainbreakpoint was hit but recorded underother_stopsrather than as an event. Two reruns recorded it normally. That looks like flakiness unrelated to naming, since this PR does not touch the tracer.User-visible output (CLI
inspect-macho --format json, C binary):{"name":"_main","runtime_name":"main","address":"0x1000004e0",…}, import{"name":"_printf","runtime_name":"printf",…}.Cost: in the full Evidence for Calculator.app (1 export, 2059 Swift-heavy imports),
normalized_resultgrew from 399,070 to 537,169 bytes (+34.6%). A 64-row imports page grew from 11,835 to 16,565 bytes. For the C binary the growth was 10,086 to 10,193 bytes. These are byte counts, not token counts. MCP deliversinspect_machoas a summary by default, so rows are paid for only when a caller pages them.inspect-machoon Calculator took 1.89 s wall time with a 421 MB peak RSS; no before/after timing comparison was made, and the derivation is one string slice per row.Remaining proof gaps: x86_64 and other hosts were not run. Swift/C++ symbols were checked only with exports from locally built binaries, not third-party apps. Observation
symbolremains the LLDB display name, so a C++/Swift event cannot be joined toruntime_nameby string equality; it is joined viabreakpoint_indexor the address.Boundary regressions: malformed/unknown names (null, empty, bare
_) and source-value preservation are covered. Lifecycle regressions: not applicable.Validation performed
npm run test:local -- src/domain/native/machoSymbolName.test.ts src/domain/analysisView/machoView.test.ts src/contracts/toolEffects.test.ts src/native/NativeMachoInspection.test.ts: 4 files, 41 tests passednpm run test:focused --the native inventory/provider/UUID-less/selected-architecture/re-export goldens, the native exports filesystem test, the Mach-O summary MCP test, the managed native verification conformance and adapter tests, the managed unknown-identity MCP test, the missing-UUID CLI test, and the output-schema semantic constraints test: 12 files, 178 tests passed. The first run failed innativeMachoSummaryMcpbecause of the fixture shape; the fixture was updated and rerun (3/3 passed).npm run test:local -- src/contracts/toolInputReferences.test.ts, thennpm run test:focused --the native call observation tests, tool schema validity, native call MCP, local tool contracts, direct analysis factories, the native inventory golden and the Mach-O summary MCP test: 34 tests passed, then 7 files and 86 tests passednpm run check:fast: passednpm run format:check: passednpm run metadata:check: passednpm run docs:check: passedCompatibility, safety, and release
runtime_name: null.Author readiness
Human owner: @kaoru0822-kitauji
Before merge
type(scope): outcome.🤖 Generated with Claude Code
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