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[PR #7064] [CLOSED] fix(apple): grade 32-bit ARM FAT slices by CPU subtype in dylib resol… #7617
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opened 2026-11-03 13:39:08 +00:00 by bsakaguchi
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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/7064
Author: @prahlad-lodhi-348
Created: 10/25/2026
Status: ❌ Closed
Base:
main← Head:fix/arm32-fat-slice-order📝 Commits (1)
2cb1955fix(apple): grade 32-bit ARM FAT slices by CPU subtype in dylib resolution📊 Changes
2 files changed (+118 additions, -0 deletions)
View changed files
📝
src/domain/apple/dyldPaths.ts(+38 -0)📝
src/domain/apple/dylibResolution.test.ts(+80 -0)📄 Description
This PR addresses #6723.
I used an AI assistant to help analyze the issue and write the fix and tests. I ran the repro script, verified the test counts, and personally reviewed the full diff of
src/domain/apple/dyldPaths.tsandsrc/domain/apple/dylibResolution.test.tsagainstupstream/main.Summary of Changes
CPU_TYPE_ARM = 12), all slices share the display name "arm", which causedcompatibleSliceto simply return the first ARM slice found in FAT order. This meant an ARMv7s process could end up following a different child dependency depending solely on slice order.dyldPaths.ts:CPU_TYPE_ARM = 12and anARM32_SUBTYPE_PREFERENCEmapping table (subtype 11/v7s prefers[11, 9], subtype 9/v7 prefers[9]).arm32Slicehelper function to grade and filter slices by CPU subtype preference regardless of FAT order.preference === undefined), it checks the unique base subtypes using aSet. If all available ARM slices share the same subtype (subtypes.size <= 1), it safely returnsarm[0]; otherwise, it returnsundefinedinstead of silently picking the first one in FAT order.Verification & Testing
specialized-child.dylib.dylibResolution.test.ts. Without the fix, 3 tests fail (3 failed, 102 passed); with the fix, all 105 pass.git diff upstream/main, confirming 118 insertions across the 2 files (dyldPaths.tsanddylibResolution.test.ts) with no secrets or unrelated cleanup.npm run check:fastsuccessfully (note: fullnpm run checkwas not run).Leaving the readiness checkboxes unchecked for now as this is a draft. Will update them once CI is green and final reviews are good.
Summary
Fixes #6723. Dylib resolution picked the first 32-bit ARM slice in FAT order, so the same ARMv7s process followed a different child dependency depending only on slice order, while reporting resolved/complete.
Problem and expected behavior
For CPU type 12 every slice has the display name "arm", so
compatibleSlice()returned the first ARM slice. Repro from the issue: with FAT order [v7, v7s] the trace followsgeneric-child.dylib; with [v7s, v7] it followsspecialized-child.dylib.Expected: an ARMv7s process prefers the ARMv7s slice regardless of FAT order and falls back to ARMv7 only when v7s is absent. When the process policy is not established, the graph should not be reported as resolved from an order-selected slice.
Change and scope
src/domain/apple/dyldPaths.ts: subtype-aware ARM32 selection incompatibleSlice. ARMv7s (11) prefers 11, then 9. ARMv7 (9) accepts only 9. For a process subtype outside this table, a slice is chosen only when the ARM slices cannot disagree; otherwise none is picked, which surfaces as the existingarchitecture-missingoutcome.src/domain/apple/dylibResolution.test.ts: 5 new test cases (4 scenarios, one parameterized over both FAT orders).Follow the contribution scope.
Ordinary fix within existing boundaries; no maintainer scope decision required.
Contract and boundary impact
compatibleSliceinsrc/domain/apple/dyldPaths.ts; its consumers are the three call sites insrc/domain/apple/dylibResolution.ts. No superseded paths removed.architecture-missingoutcome instead of an order-selectedresolvededge.Expected effects:
Evidence and regression coverage
Evidence below is executed unless marked otherwise.
src/domain/apple/dylibResolution.test.ts: ARMv7s process with FAT order [v7, v7s] and [v7s, v7] (both pick the v7s slice); ARMv7s process with only a v7 slice (falls back to v7); ARMv7 process with both slices (picks v7, never v7s); unknown process subtype with differing slices (architecture-missing, no children followed).generic-firstfollowsgeneric-child.dylib,specialized-firstfollowsspecialized-child.dylib. After: both orders followspecialized-child.dylib. With the fix removed (stashed), the new tests give 3 failed | 102 passed; with the fix, 105 passed.traceDylibLoading/traceDylibResolutionlevel only.Remaining proof gaps:
architecture-missing) rather than a dedicated "undetermined" outcome; maintainers may prefer the latter.For evidence-bearing changes:
Validation performed
specialized-child.dylibnpm run test:focused -- src/domain/apple/dylibResolution.test.ts— 105 passed (100 existing + 5 new); with the fix removed, 3 failed | 102 passednpm run check:fast— typecheck and lint passed (2 successful tasks)npm run check(full),npm run docs:check, real-provider or Apple-host workflowsCompatibility, safety, and release
Author readiness
Human owner: @prahlad-lodhi-348
Before merge
type(scope): outcome.🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.