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ADFA-6199: hold library PSI strongly in the Kotlin LSP analysis session - #2079
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…hange The file did not conform to the ktlint ratchet, so touching it at all pulls the whole file under `ratchetFrom = origin/stage`. Committed standalone so the behavioural change that follows reads as a one-line diff.
…session
The Kotlin LSP reports ~293 handled exceptions to GlitchTip from
SourceFileIndexer.analyzeDeclaration whose text is "Error while resolving
org.jetbrains.kotlin.fir.*" over a cause of "Cannot restore
StubIndexReference{...android.jar!/...}" or an opaque NullPointerException
naming PluginProblemReporter. Both come from the same throw site,
JavaElementPsiSourceWithSmartPointer.getPsi().
analysis-api-impl-base.xml registers JavaElementSourceWithSmartPointerFactory
for JavaElementSourceFactory. Its SmartPsiElementPointer keeps the compiled
library PSI only through a Weak/SoftReference plus a recipe to re-derive it,
and the layer beneath is weak too: FileManagerImpl's view-provider cache is a
weak-value map, and ClsFileImpl.myStub is a SoftReference. Nothing holds a
strong root, so on a phone under heap pressure the cls PSI is collected, the
re-derivation returns null, and getPsi() throws.
Smart pointers exist so library PSI can survive VFS invalidation in an IDE. A
standalone LSP never invalidates library PSI, so the indirection buys nothing
here and only adds the failure mode. Register JavaFixedElementSourceFactory
instead - it keeps the PSI in a plain field, and it is what
KotlinCoreEnvironment registers for the compiler's own MockProject.
The registration lands after the plugin XML (LspAnalysisApiServiceRegistrar
runs PluginStructureProvider first, then servAll), and
MockComponentManager.registerService(Class, Class) unregisters the existing
component before registering, so this replaces the XML binding. Every
construction path funnels through JavaElementSourceFactory.getInstance, and
nothing casts to the concrete smart-pointer source type.
Not fixed here: the ~269 events with no cause exception ("No fir element was
found for X", "FirDeclaration was not found for X", "Classifier was found in
KtFile but was not found in FirFile"). Those are a separate defect.
Heap impact is not yet established - see the PR description.
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📝 Summary
WalkthroughThe Kotlin Analysis API provider registers ChangesKotlin service registration
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~8 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to The change may leave the existing factory in use, so the reported library-PSI failures may persist. Ensure the service is replaced before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In
`@lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/registrar/AnalysisApiServiceProviders.kt`:
- Line 71: Update LspAnalysisApiServiceRegistrar so
JavaFixedElementSourceFactory replaces the XML-registered
JavaElementSourceFactory service; use ServiceContainerUtil.replaceService rather
than projectService, which only registers a mapping.
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lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/registrar/AnalysisApiServiceProviders.kt
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Daniel-ADFA
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MINOR
- AnalysisApiServiceProviders.kt:71 - no test pins the factory override
The change does what it says. Verified at 2b526644d:
- The override replaces the XML binding:
MockComponentManager.registerService(Class, Class)unregisters before registering (bytecode inkt-android.jar), and the XML (analysis-api-impl-base.xml:68-71, viakt-lsp.xml->analysis-api-fir.xml) loads beforeservAllin the only registrar both environments use. CodeRabbit's earlier finding does not hold; reply in its thread. :lsp:kotlin:testV8DebugUnitTestpasses at this head (525 tests, 0 failures), andKtLspTestEnvironmentusesProduction, so the suite runs with the fixed factory.
On memory: the measured table covers a cleared-index indexing run to plateau. It does not cover a long completion-heavy session, where strong cls PSI now lives as long as each FIR library session instead of being collectable on its own. Not posted as a finding, since under pressure that trades a thrown Cannot restore for a session rebuild, but a heap reading after a completion sweep on a low-end device would close the question the description already leaves open.
This repo has no written approve/request-changes rule (CLAUDE.md's "no critical, high, or medium findings" governs the Jira QA transition), so the default applied. The review pass ran at medium effort.
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Approving. Please add the one-line test that pins the factory override (see the inline comment).
2 participants
ADFA-6199
Registers
JavaFixedElementSourceFactoryforJavaElementSourceFactory, so the Kotlin LSP holds compiled library PSI strongly instead of through a smart pointer.The defect
~293 of the handled exceptions this ticket family reports come from one throw site:
JavaElementPsiSourceWithSmartPointer.getPsi(). The two message shapes in GlitchTip (Cannot restore StubIndexReference{...android.jar!/...}andCannot restore a PsiElement from ...) are the same throw, differing only in how the pointer'stoString()renders. The 129 opaqueNullPointerExceptions namingPluginProblemReporterare the same condition routed throughPsiUtilCore.ensureValid, which cannot build itsPluginExceptionbecause that service is not registered on ourMockApplication.Nothing holds a strong root to the cls PSI:
analysis-api-impl-base.xml:68-71bindsJavaElementSourceFactorytoJavaElementSourceWithSmartPointerFactory.SmartPsiElementPointerImpl.myElementis ajava.lang.ref.Reference, assigned fromnew WeakReferenceornew SoftReference- a cache plus a recipe, never authoritative.FileManagerImpl's view-provider cache (ClassicFileViewProviderCache) is built byCollectionFactory.createConcurrentWeakValueMap().ClsFileImpl.myStubis avolatile SoftReference<StubTree>, a second independent collection point.Under heap pressure on a phone the PSI is collected,
PsiAnchor$StubIndexReferencere-derivation returns null, andgetPsi()throws. The OOM at the same call site (CODEONTHEGO-RH: 24-byte allocation failing with ~4 MB free) and the affected hardware (Xiaomi 25102RKBEC, Infinix X6716B, I2306) fit that trigger.Why the fixed factory
Smart pointers exist so library PSI survives VFS invalidation in an IDE. A standalone LSP never invalidates library PSI, so the indirection buys nothing and only adds the failure mode.
JavaFixedElementSourceFactorykeeps the PSI in a plain field, and it is whatKotlinCoreEnvironment.Companion.registerProjectServicesregisters for the compiler's ownMockProject.The swap is total and safe to make:
LspAnalysisApiServiceRegistrar.registerProjectServicesrunsPluginStructureProvider(the XML) first, thenservAll, so this registration lands last.MockComponentManager.registerService(Class, Class)callspicoContainer.unregisterComponent(name)before registering - an unconditional replace.projectService(...)produces exactly that call.JavaElementSourceFactory.getInstance(...).createPsiSource(...).instanceof/checkcastagainst the concrete smart-pointer source type.Verified
:lsp:kotlin:compileV8DebugKotlinandspotlessCheckpass.ldc JavaElementSourceFactory/ldc JavaFixedElementSourceFactoryin the compiledAnalysisApiServiceProviders.javap -cagainst the bundledkt-android.jar, not inferred.Heap impact - measured, no regression
The open risk was that holding cls PSI strongly would raise steady-state residency on a low-end device. Measured on an arm64 emulator against Neo-Store (349 Kotlin files, 452 distinct
android.*/androidx.*imports, Compose + Room + Koin, resolving against 11,745 classpath entries), both arms from a cleared Kotlin source index and settled to a stable plateau:scanned)sourceIndexCountJava heap differs by 0.27% on a ~332MB working set, in the lower direction; TOTAL PSS by 0.05%. Both sit inside the run-to-run variance observed on this setup - the baseline arm alone moved 500K between a warm and a cold run.
Method: same APK pair throughout, identified by sha256 (baseline
7fb589f9..., fixd5673097...) and verified against the installed package each time. Between arms,databases/kt-source-file-indexandkt-source-file-meta-indexwere deleted so every file is re-analysed;KtFileMetadata.shouldBeSkippedotherwise makes a warm run index nothing. Readings taken afterscannedandsourceIndexCountheld steady across consecutive 25-30s samples.Both arms were run twice. An earlier treatment reading of 473 files / 1582 symbols was discarded: it came from a warm index that had been through an extra sync-plus-build cycle, not from the change. On a cleared index both arms land on 411 files.
Still not verified - the benefit
This measures the cost side only. Neo-Store on this emulator never reproduced the
Cannot restorefailures the PR targets, because they need the memory pressure of a low-end device to collect the soft references behind the cls PSI. So the fix is shown not to cost heap; it is not yet shown on-device to remove the GlitchTip events. The bytecode argument for why it does is above.The
sourceIndexCountbeing 16 lower with the fix (795 vs 811) is small and unexplained. Worth a repeat run before reading anything into it.Scope
Does not address the ~269 events in this family that carry no cause exception (
No fir element was found for X,FirDeclaration was not found for X,Classifier was found in KtFile but was not found in FirFile). Those are a separate defect; experiments showed they are not caused by PSI instance mismatch or by any declaration shape.Review by commit
style:- Spotless ratchet reformat, no functional change.fix:- the change itself, +11 / -0.