ADFA-5156: Roll back R8 shrinking to unbreak plugins - #1679
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Restores the blanket -dontshrink that ADFA-3604 (#1596) removed on 2026-07-29. This is a temporary rollback to restore plugin functionality; a targeted fix follows. Plugins are loaded parent-first through a stock DexClassLoader (PluginLoader.kt:92-116, parent passed at PluginManager.kt:603), so every kotlin.** class a plugin references resolves from the IDE's dex, not from the ~1058 stdlib classes the plugin bundles. R8 cannot see plugin call sites, so it strips every stdlib member the IDE itself does not call. The net effect is that a plugin can only call the subset of the Kotlin standard library that the IDE also calls; anything else throws NoSuchMethodError at runtime. Sketch to UI fails on every image load with "No static method maxOrNull([F)Ljava/lang/Float; in class ArraysKt". -dontobfuscate and -dontoptimize were already set, so restoring -dontshrink reduces R8 to a pass-through and returns the release build to the configuration shipped before ADFA-3604. isMinifyEnabled and isShrinkResources are deliberately left alone, keeping resource shrinking and the build wiring unchanged. Verified by dex-scanning both APKs (baseline pulled from a release install on Samsung RFCT704HEAL): kotlin/kotlinx method declarations 30,669 -> 45,371 ArraysKt/CollectionsKt/MapsKt/ FilesKt/SequencesKt facades absent -> present 10 sketch-to-ui stdlib call sites all stripped -> all present CompletableJob$DefaultImpls.plus stripped -> present Sketch to UI now loads an image and completes detection on-device with no NoSuchMethodError in logcat. APK size: 659,307,160 -> 706,829,817 bytes (+47.5 MB, +7.2%). Note: R8 was buying less than #1596 advertised. That PR measured dex at 28.8 MB / 24,853 classes, but the shipped APK is 85 MB / 78,757 classes -- the URGENT follow-ups (#1609, #1610) added -dontoptimize plus a set of keep rules that clawed most of it back.
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📝 Walkthrough
WalkthroughThe change temporarily disables R8 shrinking and adds DEX dump and plugin-impact analysis tools. The tools compare reference and candidate host DEX files, resolve Kotlin and Kotlinx method calls, and explain missing classes and methods. ChangesR8 plugin-impact validation
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The PR restores plugin compatibility by disabling shrinking, but its new validation scripts can silently analyze stale or incomplete APK data and undercount affected call sites, potentially giving false confidence in the rollback. Merge should wait for these bounded validation issues to be fixed or explicitly accepted by the owner. Sequence Diagram(s)sequenceDiagram
participant Archives
participant dex_dump_sh
participant analyze_plugin_impact_py
participant HostAndPluginDumps
Archives->>dex_dump_sh: Provide APK or CGP archives
dex_dump_sh->>HostAndPluginDumps: Write DEX dump files
HostAndPluginDumps->>analyze_plugin_impact_py: Provide host and plugin dumps
analyze_plugin_impact_py->>analyze_plugin_impact_py: Resolve method calls and compare hosts
analyze_plugin_impact_py-->>Archives: Report regressions and absent classes
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Cross-plugin impact: all 24 plugins, zero regressionsSimulated parent-first resolution for every Calls made from inside each plugin's bundled stdlib copy are excluded — that copy is shadowed at runtime, so those are not real call sites.
Regressions: none. No call site that resolved in the shipped build fails after the rollback. Expected, since * The 8 remaining are false positives. All are inherited from the Android boot classpath, which isn't in the APK and so is invisible to the analysis: The 152 remaining fall-throughs are benign — only 3 distinct classes, all D8 build-time synthetics generated during the plugin's own dexing, with no host counterpart by design: The ticket understated the blast radiusIt listed sketch-to-ui 12, compose-preview 3, layout-editor 1, Beepy/markdown-preview 0. Measured across the whole catalogue, ten plugins carried guaranteed-failure call sites in the shipped build: compose-preview 36 (not 3) · sketch-to-ui 20 (not 12) · client-time-tracker 5 · random-xkcd 5 · markdown-previewer 2 (not 0) · project-to-template 2 · ai-assistant, ai-literacy-course, keystore-generator, layout-editor 1 each Beepy at 0 is confirmed. This was breaking considerably more of the catalogue than recorded — most of it latent, on paths users hadn't hit yet. Method: |
The ADFA-5156 failure mode is invisible at build time -- assemblePlugin is
green, the manifest is fine, the .cgp is correct, and only on-device
execution of a specific code path reveals that R8 stripped a stdlib member
the plugin needs. These scripts make it measurable from build artifacts
instead.
scripts/r8-plugin-impact/
README.md what the bug is, how to run, how to read output,
the known false positives, and the ADFA-5156
baseline numbers to measure future builds against
dex-dump.sh extract + dexdump an APK or .cgp
analyze-plugin-impact.py simulate parent-first resolution of every
kotlin.*/kotlinx.* call site in each plugin's own
code against two host dexes and diff the verdicts
Three subcommands: impact (the before/after table), explain-method (trace one
resolution chain, showing where it leaves the APK), explain-absent (inspect
fall-throughs for the split-brain shape that caused the original bug).
Documents three traps that produce wrong conclusions if analysis is done ad
hoc, all of which bit during this investigation:
- Methods inherited from the Android boot classpath read as missing, because
java.util.* is not in the APK. Eight such false positives are enumerated.
- Kotlin multifile facades (ArraysKt, StringsKt) declare nothing themselves;
they extend a part class whose underscore count varies
(StringsKt__StringsKt vs ArraysKt___ArraysKt). Checking a facade directly
always fails.
- D8 build-time synthetics ($$ExternalSyntheticBackport0 and friends) never
exist in the host and always show as absent.
Stdlib-only Python, no third-party dependencies. Run with
uv run --no-project.
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Actionable comments posted: 4
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Inline comments:
In `@scripts/r8-plugin-impact/analyze-plugin-impact.py`:
- Around line 157-165: Update the site-processing loop around parse_plugin’s
sites data to iterate each target together with its stored occurrence count, add
that count rather than one to cr and cc, and report sum(sites.values()) in the
rows site-total field. Preserve regression and remaining-method tracking per
target occurrence entry while ensuring repeated call sites are included in
aggregate counts.
In `@scripts/r8-plugin-impact/dex-dump.sh`:
- Around line 57-75: Update the artifact-processing flow around the unzip
extraction and DEXDUMP loop to check the exit status of unzip and every
"$DEXDUMP" invocation. When extraction or dumping fails, report the artifact
failure and terminate with a nonzero status instead of treating missing DEX
output as a skip; preserve normal processing for successfully handled artifacts.
- Around line 57-76: Update the artifact-processing flow to remove stale
classes*.dex files and the selected output file (full-dump.txt or dis.txt)
before extracting and dumping each requested artifact, ensuring reruns with the
same output directory always analyze the current artifact.
In `@scripts/r8-plugin-impact/README.md`:
- Around line 53-57: Update the verdict table in the README so NoSuchMethod is
described as a potential failure only after explain-method confirms it, rather
than as universally guaranteed. Preserve the distinction that hierarchy
resolution may leave the APK through boot-classpath inheritance without causing
a runtime failure.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (3)
scripts/r8-plugin-impact/README.mdscripts/r8-plugin-impact/analyze-plugin-impact.pyscripts/r8-plugin-impact/dex-dump.sh
The first baseline measured a local folder of .cgp files that turned out to be a pre-rename snapshot -- 5 stale filenames and 3 plugins missing. Re-runs against the artifact from the last update-libs.yml deploy (26 plugins, 4,261 call sites) and documents how to obtain that artifact, so the next person does not measure the wrong set. Conclusion is unchanged: zero regressions, 67 real failures to 0.
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Correction + re-run against the actual deployed plugin set The earlier cross-plugin analysis measured a local folder of .cgp files that turned out not to be authoritative. It was a pre-rename snapshot: 5 stale filenames ({{templatemanagerplugin}} -> {{template-manager}}, {{IconsRepository-Plugin}} -> {{icons-repository}}, {{fluttertemplate}} -> {{flutter-template}}, and {{code-suggestions}}/{{speech-to-text}} losing their {{-plugin}} suffix) and 3 plugins missing outright ({{cotg-ndk}}, {{pair-programming}}, {{vector-search}}). Re-ran against the artifact from the last {{update-libs.yml}} deploy (run 31626494060, 2026-08-12) -- the workflow that actually scp's .cgp files to {{public_html/flags/plugins}}, so that artifact is what users have installed. 26 plugins, 4,261 call sites. || ||shipped (shrinking on)||rolled back|| Conclusion unchanged, now on the right artifacts: zero regressions, 67 real failures -> 0. The 8 remaining are byte-identical to the previously documented boot-classpath false positives (compose-preview 7, random-xkcd 1). The 7 plugins the first pass never covered are all clean: {{code-suggestions}}, {{cotg-ndk}}, {{flutter-template}}, {{icons-repository}}, {{speech-to-text}}, {{template-manager}}, {{vector-search}} -- 0 failures before and after. {{ai-assistant}} shows 2 rather than 1 in the shipped build (slightly different build than the local copy). Revised list of plugins that carried guaranteed-failure call sites in the shipped build: compose-preview 36, sketch-to-ui 20, client-time-tracker 5, random-xkcd 5, ai-assistant 2, markdown-previewer 2, project-to-template 2, and ai-literacy-course / keystore-generator / layout-editor 1 each. Release guidance No plugin rebuild or plugin-api refresh is needed to ship the IDE fix:
Worth noting operationally: {{update-libs.yml}} is {{workflow_dispatch}} only. It will not fire when the IDE release is cut, so shipping the IDE changes nothing about the deployed plugins unless it is run deliberately. Recommend not running it as part of this release -- it would replace every deployed .cgp with a fresh unvalidated build for no compatibility benefit. Deploying the 3 plugins currently absent from the website ({{cotg-ndk}}, {{pair-programming}}, {{vector-search}}) is a separate product decision, not part of this fix. Tooling to reproduce all of this is on the PR at {{scripts/r8-plugin-impact/}}, including how to fetch the deployed artifact so the next person does not measure the wrong set. |
1 participant
Temporary rollback to restore plugin functionality. A targeted fix follows next week under the same ticket.
Problem
Plugins load parent-first through a stock
DexClassLoader(PluginLoader.kt:92-116, parent passed atPluginManager.kt:603), so everykotlin.**class a plugin references resolves from the IDE's dex, not from the ~1058 stdlib classes the plugin bundles. R8 cannot see plugin call sites, so it strips every stdlib member the IDE itself does not call.Net effect: a plugin can only call the subset of the Kotlin standard library that the IDE also calls. Anything else throws
NoSuchMethodErrorat runtime. Sketch to UI fails on every image load withNo static method maxOrNull([F)Ljava/lang/Float; in class ArraysKt.Change
One line: restores the blanket
-dontshrinkthat ADFA-3604 (#1596) removed on 2026-07-29.-dontobfuscateand-dontoptimizewere already set, so this reduces R8 to a pass-through and returns the release build to the configuration shipped before ADFA-3604.isMinifyEnabledandisShrinkResourcesare deliberately left alone — resource shrinking and the build wiring are unchanged. That flag is the only R8 switch in the repo.Chose the rollback over the ticket's proposed
-keep class kotlin.** { *; }because it returns to a known-shipped-good state rather than a new, untested configuration. With a demo today, that mattered.Verification
Dex-scanned both APKs. Baseline pulled from the release install on Samsung RFCT704HEAL (
run-asreports "package not debuggable", confirming release).ArraysKt/CollectionsKt/MapsKt/FilesKt/SequencesKtfacadesCompletableJob$DefaultImpls.plusSketch to UI installs, loads an image, and completes detection on-device with zero
NoSuchMethodErrorin logcat. Verified against a clean install — the uninstall also clears the stalecodeCacheDir/plugin_dexthe ticket warns can confound results.Size cost
659,307,160 -> 706,829,817 bytes, +47.5 MB (+7.2%). Dex 85 MB -> 116 MB; classes 78,757 -> 101,793.
Worth knowing for next week's decision: R8 was buying less than #1596 advertised. That PR measured dex at 28.8 MB / 24,853 classes, but the shipped APK is 85 MB / 78,757 classes — the URGENT follow-ups (#1609, #1610) added
-dontoptimizeplus a set of keep rules that clawed most of it back. The real cost of shrinking at rollback time was ~31 MB of dex, not the ~90 MB the original PR implies.Note on the ticket's impact table
It overstates compose-preview.
SendChannel.send,Flow.collect, andDeferred.awaitwere already present in the shipped build — they are inherited interface methods, and only the declaring supertype needs to survive. Of the three latent call sites onlyCompletableJob.pluswas genuinely missing. Same point applies to the facades:ArraysKtand friends declare nothing themselves, they extend the part class (ArraysKt___ArraysKt), which is exactly the resolution path the ticket describes.Not addressed here
kotlin.**/kotlinx.coroutines.**(the real fix, next week)codeCacheDir/plugin_dexcleanup gap inPluginManager.kt:1779-1826ComputerVisionViewModel.kt:154Rovo Dev code review: Rovo Dev not activated in your linked Atlassian organization
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