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refactor: move Android out of the engine (#902 items 1-3) - #904
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📝 WalkthroughWalkthroughThe change replaces Android-specific storage and shared-memory handling with caller-supplied storage roots and a generated target capability. It removes the Android runtime helper module and adds a source-tree guard for platform-specific names. ChangesPlatform Portability
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Refactor Merge Risk: 🟡 Moderate · up to iOS callers cannot use the new private-storage root option. Fix that path before merging unless iOS storage is explicitly out of scope. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1⚔️ Resolve merge conflicts 💡
🧪 Generate unit tests (beta)
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| /// The app-private root the platform package supplies (a mobile | ||
| /// app's internal storage). Saves go to `<platform_root>/saves`; | ||
| /// without it the OS user-data default is used. | ||
| platform_root: ?[]const u8 = null, |
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When a mobile caller follows docs/persistent-blobs.md, it is still told that Default reads the Android native activity path automatically, even though this change removes that behavior and requires the caller to populate options.platform_root. Because this field defaults to null, such code still compiles but Android initialization can now fall through to HOME or return Unavailable, potentially misplacing or disabling saves; update the shipped documentation to describe the new input and precedence.
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Review comments at @src/storage/default.zig:
- Line 58: Update the platform switch in Default.init to handle the iOS OS tag
as a POSIX mobile platform, allowing a supplied absolute platform_root to be
used. Keep unsupported OS defaults mapped to error.Unavailable.
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build.zigdocs/persistent-blobs.mdsrc/android.zigsrc/preview_shm.zigsrc/root.zigsrc/storage/data_root.zigsrc/storage/default.zigsrc/storage/files.zigtest/agnostic_guard_test.zigtest/storage_test.zig
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- src/android.zig
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| } else { | ||
| const android = builtin.abi == .android or builtin.abi == .androideabi; | ||
| const platform: storage.dataRoot.Platform = if (android) .android else switch (builtin.os.tag) { | ||
| const platform: storage.dataRoot.Platform = switch (builtin.os.tag) { |
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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win
Accept a supplied root on iOS.
If an iOS caller supplies an absolute platform_root, this switch returns error.Unavailable before Default.init examines the root. The new mobile-root option therefore cannot provide native storage on iOS. Allow a POSIX mobile target to use a supplied root, while keeping unsupported OS defaults unavailable. Zig treats iOS as a separate OS tag. (github.com)
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Review comment at @src/storage/default.zig at line 58:
Update the platform switch in Default.init to handle the iOS OS tag as a POSIX
mobile platform, allowing a supplied absolute platform_root to be used. Keep
unsupported OS defaults mapped to error.Unavailable.
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1. Immersive mode: delete src/android.zig and its root export. It now lives in labelle-android 0.3.0 (`immersive`), which the generated main.zig calls since the matching assembler change. 2. preview_shm: gate on a `target_features.has_posix_shm` capability the build computes from the target (Bionic has no shm_open/shm_unlink), instead of an Android ABI check in src/. 3. Storage: drop the Android platform and the engine's own ANativeActivity read. The caller supplies `platform_root` (a mobile app's internal storage). It wins over the OS user-data defaults, and only LABELLE_DATA_DIR wins over it. storage.Default has no production caller today, so nothing changes at runtime. The agnostic guard drops four entries that are now clean (android.zig, preview_shm.zig, storage/data_root.zig, storage/files.zig), from 44 to 40. Must not be released before the assembler that calls labelle-android's immersive service, or immersive projects fail to compile.
The engine no longer reads the Android activity's internal data path, so the caller supplies it as options.platform_root. Document the new input, where it sits in the resolution order, and what happens without it.
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| /// consumer on such a target — so there we return `error.ShmOpenFailed` from | ||
| /// every entry point and rely on Zig's comptime dead-code elimination to | ||
| /// drop the linker references to `std.c.shm_*` entirely. | ||
| const has_posix_shm = @import("target_features").has_posix_shm; |
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When tools/hook_trace_cost.sh runs, both build_probe and the step-4 MODS array construct the engine directly with -Mengine=.../src/root.zig but do not declare or pass a target_features module. The probe instantiates Game, whose preview field reaches Preview and preview_shm.Producer, so this new import is analyzed and Zig reports that no module named target_features is available; update those direct build commands (or route them through the configured build module) so the repository's tracing benchmark remains runnable.
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…e bench - storage.Default returned Unavailable on an OS with no user-data default (iOS, say) before looking at a supplied platform_root. A supplied root now works there too, checked with POSIX path rules. - tools/hook_trace_cost.sh compiles the engine directly, so it has to declare the new target_features module (host: has_posix_shm = true). The script still fails further on with a missing `animation` module, which predates this change and is out of scope here.
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| // Any other OS has no user-data default here, but a | ||
| // supplied `platform_root` still works; it is checked | ||
| // with POSIX path rules. | ||
| else => if (options.platform_root != null) .linux else return error.Unavailable, |
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On targets outside Windows, macOS, and Linux (such as iOS/tvOS), initialization returns Unavailable here whenever platform_root is null, before reading LABELLE_DATA_DIR. This breaks the documented precedence where an absolute environment override is sufficient and should win over every other root source; select the POSIX fallback when either an override or platform_root is present, or read the override before this switch.
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On an OS with no user-data default, Default.init returned Unavailable unless a platform_root was supplied, so it never reached the environment override that is documented to win over every other root. Take the POSIX path when either one is present.
SM-T505 immersive test: PASS (3/3)This is the tablet run owed from the Trello card (the P42 already passed 3/3). Build:
Device: SM-T505, Android 12. Measured with
Tested by Claude on the owner's tablet. |
Closes the three Android items of #902. It is stacked on #903 (the guard) and must merge after it.
What
src/android.zigand its root export. It now lives in labelle-android 0.3.0 (labelle-android#23), called from the generatedmain.zig(labelle-assembler#796).preview_shm: gate ontarget_features.has_posix_shm, a capabilitybuild.zigcomputes from the target. Bionic ships noshm_open/shm_unlink. This replaces the Android ABI check insrc/.ANativeActivityread.platform_root(a mobile app's internal storage).LABELLE_DATA_DIRbeatsplatform_root, which beats the OS user-data defaults.storage.Defaulthas no production caller today, so nothing changes at runtime.The guard drops the four entries that are now clean:
android.zig,preview_shm.zig,storage/data_root.zigandstorage/files.zig. That takes it from 44 to 40 files.Tests
zig build testagainst labelle-coremain: 271/271 steps, 1484 tests.preview_shmcompiles foraarch64-linux-android(shm off),x86_64-linux-gnuandaarch64-macos.Release order: do not release before the assembler
Release this only after labelle-assembler#796 ships and Flying Platform runs on it with labelle-android 0.3.0, accepted on the SM-T505. With an older assembler, immersive projects would fail to compile, because the generated code calls
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