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[PR #2639] [CLOSED] fix(native): retain partial metadata when a protocol-list slot is unmapped #5300
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opened 2026-10-31 01:05:33 +00:00 by bsakaguchi
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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/2639
Author: @sx4im
Created: 10/13/2026
Status: ❌ Closed
Base:
main← Head:fix/2610-native-protocol-list-unmapped-partial📝 Commits (10+)
c0b7781fix(native): retain partial metadata when a protocol-list slot is unmapped9a80fb3fix(native): bound failed class-list slots by the record budget794b734fix(native): admit each failed objc list slot exactly once7b9b666refactor(native): own failed Objective-C slot accounting once31137e5fix(native): bound every Objective-C list slot attempt22b76eefix(native): scope Objective-C list scan truncation92f72f4fix(native): retain class-dependent scan coverage limits40e0de4fix(native): give each Objective-C list scan its own slot bound05f9b3afix(native): retain unresolved pointer coverage reasons98f985brefactor(test): split Apple dispatch budget cases📊 Changes
5 files changed (+334 additions, -28 deletions)
View changed files
📝
src/native/AppleDispatchCoverage.ts(+19 -14)📝
src/native/AppleDispatchMetadata.test.ts(+215 -0)📝
src/native/AppleDispatchMetadata.ts(+18 -9)📝
src/native/AppleObjcDispatchFacets.ts(+78 -5)📝
src/native/AppleSwiftVtables.test.ts(+4 -0)📄 Description
Summary
Fixes #2610.
A Mach-O image with valid Objective-C class metadata and an unmapped
__objc_protolistslot failed its entire static dispatch-metadata decode. The class-list loop already records per-slot mapping failures into partial coverage, but the protocol-list loop read its slot pointer unguarded, so the same unmapped pointer aborted the whole decode beforeprotocolReader.recordcould handle the record. Now the protocol-list slot uses the same guard as the class-list slot: the failure is recorded, theobjc_class_method_ivar_metadatafacet coverage becomes partial with a reason naming the mapping failure, and the independently decodable class is retained.Problem and expected behavior
Smallest trigger: build the 4096-byte fixture from the issue with the protocol-list section address pointing at an unmapped page (
base + 0x9000). The decode throwsRangeError: Unmapped or ambiguous metadata pointer 0x100009000out ofdecodeObjcDispatchFacetsat the protolist loop (AppleObjcDispatchFacets.ts:203). Expected: partial coverage with a reason identifying the mapping failure whileRetainedClassand its coverage records still reach the caller, matching the existing behavior for an unmapped class-list slot.Change and scope
Wrapped the per-slot pointer read in the
__objc_protolistloop in the same try/catch shape the__objc_classlistloop already uses in the same function: the field address is hoisted, the failure is pushed tofailuresas<field>: <message>, and the loop continues.pushDispatchCoveragealready turns those failure strings into partial facet coverage with a reason, so no other code changes were needed. Added three regression tests insrc/native/AppleDispatchMetadata.test.tsusing the fixture from the issue verbatim (controlsneither,class,protocol).Scope decision: not applicable. This is a routine fix inside the existing decode boundary; no new providers, no target execution, no new scope.
Contract and boundary impact
decodeObjcDispatchFacets,src/native/AppleObjcDispatchFacets.ts).Expected effects:
Evidence and regression coverage
src/native/AppleDispatchMetadata.test.ts("Apple dispatch unmapped protocol-list slot"), fixture builder taken verbatim from the issue.RangeError: Unmapped or ambiguous metadata pointer 0x100009000(new test failed red); after the fix the same control returnsRetainedClasswith the facet coveragepartialand the reason containing0x100009000. Theneithercontrol still returns the class with complete coverage, and theclasscontrol still yields partial coverage as before.NativeMacOSProviderprovider-level repro was not exercised; the decoder test covers the root cause directly and the provider path only wraps this decoder.For evidence-bearing changes:
Validation performed
npm run test:local -- src/native/AppleDispatchMetadata.test.ts- 25/25 passed (22 existing + 3 new; the protocol control failed before the fix, passed after)npm run test:local -- src/native/AppleSwiftVtables.test.ts- 3/3 passed (only other test file importing this code path)npm run check:fast- typecheck + lint greennpm run verify:test-discovery- all 1024 test files discovered exactly onceCompatibility, safety, and release
Before merge
type(scope): outcome.🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.