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ADFA-6228: Make the JVM symbol index correct enough to replace the classpath trie - #2072

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itsaky-adfa merged 48 commits into
perf/ADFA-6228-memprof-probesfrom
perf/ADFA-6228-index-correctness
Oct 13, 2026
Merged

itsaky-adfa merged 48 commits into
perf/ADFA-6228-memprof-probesfrom
perf/ADFA-6228-index-correctness

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@itsaky-adfa itsaky-adfa commented Sep 24, 2026 •

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ADFA-6228

2 of 4, stacked on #2071. Before the JVM symbol index can replace the per-module classpath trie, it has to give the same answers the trie gives, and give them fast. Today it does not. This PR fixes the index and migrates no consumer, so any regression here shows up in Kotlin completion alone.

Why each group of changes:

  • Rows were keyed by class name alone. A class in two JARs overwrote itself, and removing one JAR deleted the other's row. Rows are now keyed by source and name, and a shared name resolves to the smallest source id.
  • Queries were slow or wrong at scale.
    • _ in a prefix acted as a wildcard, and prefix queries skipped the column index.
    • The limit ran before the source filter, so results came back short.
    • Package lookups had no bound.
    • SQLite chose poor indexes for mixed predicates. A unary + keeps scope and kind terms out of index selection, and EXPLAIN QUERY PLAN tests pin the plans.
  • Stale or half-written data survived. The index now has a format version and is rebuilt on any mismatch. JARs are re-indexed when size or mtime changes. Re-indexing of one source is serialised. Cancellation is checked before each batch. WAL is enabled, because androidx leaves it off.
  • The scanner indexed things that cannot be referenced and missed things that can. Fixed: anonymous classes, multi-release copies under META-INF, file facades and companions. Nested visibility now comes from InnerClasses, and names use the class-file internal name.
  • Kotlin unimported-symbol completion capped rows fetched rather than items shown, and could list duplicates. It now queries exact matches first and dedupes.

Review by commit. The style: commits are Spotless-only. The last commit converts pre-existing comments only.

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itsaky-adfa added this pull request to stack #2077 September 25, 2026 09:16
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📥 Commits

Reviewing files that changed from the base of the PR and between 2214104 and c72fa57.

📒 Files selected for processing (59)
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/FilteredIndex.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/InMemoryIndex.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/MergedIndex.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndex.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/api/Core.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/api/Index.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/api/Query.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/util/BackgroundIndexer.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/FilteredIndexLimitTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/FilteredIndexTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/InMemoryIndexTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/MergedIndexTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexAnalysisLimitTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexCancellationTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexFingerprintTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexIdentityTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexJournalTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexPrefixTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexQueryPlanTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexScopeTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexVersionTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/UndeclaredFieldQueryTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/api/IndexQueryBuilderTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/util/BackgroundIndexerTest.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/CombinedJarScanner.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/JarSymbolScanner.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmGeneratedIndexingService.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmLibraryIndexingService.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmSymbol.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmSymbolDescriptor.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmSymbolIndex.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/KotlinMetadataScanner.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/KtFileMetadataIndex.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/ClasspathTrieDifferentialTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/CombinedJarScannerMultiReleaseTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/JarFingerprintTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/JarSymbolScannerDollarNameTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/JarSymbolScannerVisibilityTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmSymbolIndexKindScopeTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmSymbolIndexOptimizeTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/KotlinMetadataScannerDollarNameTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/KotlinMetadataScannerShapeTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/KotlinMetadataScannerVersionTest.kt
  • lsp/jvm-symbol-models/src/main/proto/jvm_symbol.proto
  • lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/actions/AddImportAction.kt
  • lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/index/KtSymbolIndex.kt
  • lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/index/SourceFileIndexer.kt
  • lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/completion/KotlinCompletions.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/actions/AddImportActionTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/compiler/index/IndexWorkerBatchRemovalTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/compiler/index/IndexWorkerDisposalTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/compiler/index/IndexWorkerPhaseLifecycleTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/compiler/index/SourceFileIndexerTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/completion/CollectUnimportedSymbolMatchesTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/completion/CollectUpToLimitTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/completion/UnimportedSymbolCandidateTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/fixtures/KtLspTestEnvironment.kt
  • subprojects/javac-services/src/main/java/com/itsaky/androidide/javac/services/fs/CachingJarFileSystemProvider.kt
  • subprojects/javac-services/src/test/java/com/itsaky/androidide/javac/services/fs/CachingJarFileSystemProviderConcurrencyTest.kt
📝 Summary
  • Reworks the JVM symbol index to support source-scoped keys, deterministic lookups, filtered queries, and query limits. SQLite indexes now track source fingerprints, rebuild when the format version changes, and use WAL.
  • Adds fingerprint-based JAR re-indexing and serializes indexing jobs per source. JAR fingerprints use file size and modification time; a rewrite that preserves both can go undetected.
  • Updates JVM and Kotlin class scanning for nested and anonymous classes, package-private visibility, Kotlin file facades, and multi-release JARs.
  • Improves unimported-symbol completion. Exact matches take priority, duplicate candidates are removed, and only accepted items count toward the display limit.
  • Adds tests for query behavior, query plans, scanner output, indexing cancellation and concurrency, fingerprints, and completion collection.
  • Risk: The fingerprint does not detect same-size rewrites within the filesystem’s modification-time granularity.
  • Risk: The changes update index interfaces and constructor signatures. Callers and persisted indexes must use the new APIs and format version.
  • Test execution results and review severity counts were not provided.

This change updates index query and storage contracts, adds source fingerprints and visibility-scoped queries, revises JVM symbol extraction and indexing, and changes Kotlin import and completion matching. It also makes cached JAR file-system creation atomic.

Changes: Indexing and Symbol Search

Layer / File(s) Summary
Index query contracts and storage
lsp/indexing/.../api/*, lsp/indexing/.../InMemoryIndex.kt, lsp/indexing/.../SQLiteIndex.kt, lsp/indexing/.../MergedIndex.kt, lsp/indexing/src/test/...
Queries support source-ID scopes and anyOf filters. In-memory and SQLite indexes identify rows by source and key, apply filters before limits, and support query-filtered distinct values. SQLite adds format-version handling, source fingerprints, indexes, WAL, and query optimization.
Source visibility and fingerprinted indexing
lsp/indexing/.../FilteredIndex.kt, lsp/indexing/.../BackgroundIndexer.kt, lsp/indexing/src/test/...
FilteredIndex applies visible-source scope to queries, point lookups, and distinct values. BackgroundIndexer supports fingerprint checks, same-fingerprint job reuse, and cancellation and replacement of prior jobs.
JVM symbol identity and extraction
lsp/jvm-symbol-index/.../jvm/*Scanner.kt, JvmSymbol.kt, JvmSymbolDescriptor.kt, lsp/jvm-symbol-models/src/main/proto/jvm_symbol.proto, lsp/jvm-symbol-index/src/test/...
JVM scanning records nesting and visibility from class-file metadata. Kotlin metadata scanning adds file facades and callable keys that include receiver types. The symbol payload stores its key, and the kind model adds file facades.
JVM index updates and query integration
lsp/jvm-symbol-index/.../JvmSymbolIndex.kt, *IndexingService.kt, KtFileMetadataIndex.kt, lsp/jvm-symbol-index/src/test/...
JVM symbol queries apply kind and top-level filters before limits. Generated and library JAR indexing compares fingerprints and optimizes after submitted jobs complete.
Kotlin imports and completion
lsp/kotlin/.../AddImportAction.kt, KotlinCompletions.kt, compiler/index/*, lsp/kotlin/src/test/...
Import candidates are filtered by visibility and deduplicated. Unimported completion searches exact matches before prefixes, deduplicates accepted symbols, and applies kind and accepted-item limits.

JAR File-System Cache

Layer / File(s) Summary
Atomic JAR file-system caching
subprojects/javac-services/.../CachingJarFileSystemProvider.kt, subprojects/javac-services/src/test/...
createFs now atomically computes and caches a file system for a normalized path. A concurrency test checks that parallel callers receive one instance.

Priority: ➖ Normal

Estimated code review effort: 5 (Critical) | ~120 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Completion as KotlinCompletions
  participant SourceIndex as Source index
  participant GeneratedIndex as Generated index
  participant LibraryIndex as Library index
  participant Collector as collectUnimportedSymbolMatches
  Completion->>Collector: Search with candidate kinds and item cap
  Collector->>SourceIndex: Query exact-name matches
  Collector->>GeneratedIndex: Query exact-name matches
  Collector->>LibraryIndex: Query exact-name matches
  Collector->>SourceIndex: Query prefix matches
  Collector->>GeneratedIndex: Query prefix matches
  Collector->>LibraryIndex: Query prefix matches
  Collector-->>Completion: Return accepted, deduplicated candidates
Loading

Suggested reviewers: daniel-adfa

Merge Risk: 🔵 Low · up to 22141

The index and completion changes look sound. One new concurrency test can hang the test run if its setup times out; making that cleanup robust is a small follow-up.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 22141

The reviewed changes affect local code suggestions and recoverable cached data. They preserve visibility checks and improve source isolation and interrupted-work recovery. No new privilege-boundary crossing was established, but incomplete validation of the affected behavior prevents a minimal-risk assessment.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

  • inferred — An actor able to influence workspace dependencies can supply archive and symbol data to the reviewed indexing path. Demonstrated outcomes are processing in the IDE, derived cache rows, and completion candidates. The scoped trace did not establish cross-tenant exposure, credential access, or a new privileged execution sink; it is not an application-wide security assurance.

Trust Boundaries and Controls

  • observed — FilteredIndex enforces the selected classpath view, including empty and intersected source scopes, before returning rows. Callers holding the object can change that view, so it is not an authorization boundary. Completion separately retains module/package visibility checks before offering a candidate.

Resilience and Maintainability Implications

  • observed — Known indexing services serialize submissions. A replacement cancels and joins its predecessor before deletion; cleanup removes only its own job record. SQLite checks cancellation before batches, publishes the fingerprint only in the final transaction, and deletes rows and fingerprints atomically. Earlier batches can remain visible after interruption, but a fingerprinted retry can recognize missing completion. The API still depends on caller serialization, and the legacy null-fingerprint recovery limitation predates this PR.
Pre-merge checks | Passed 4 | Inconclusive 1

❌ Failed checks (1 inconclusive)

Check name Status Explanation Resolution
Docstring Coverage Inconclusive Docstring coverage is 18.36% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 523 functions across 50 files. (9 skipped… Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Title check Passed The title clearly summarizes the main change: improving the JVM symbol index so it can replace the classpath trie.
Description check Passed The description is directly related to the changeset and explains the indexing, query, scanner, SQLite, fingerprint, and completion updates.
Linked Issues check Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check Passed Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage

Explanation

Docstring coverage is 18.36% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 523 functions across 50 files. (9 skipped: 1 unsupported, 8 over the file limit.)

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  • Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

A rabbit checks each source row,
And follows keys where matches grow.
A facade joins the class-file line,
Exact names hop ahead in time.
Jar doors share one cached key,
Then carrots wait for every bunny.

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IMPORTANT

  • CombinedJarScanner.kt:62 - a cancelled scan leaves the JarFile open until GC
  • KotlinMetadataScanner.kt:317 - extension overloads that differ only by receiver share one key
  • KotlinCompletions.kt:661 - unimported type-alias completion inserts no import

MINOR

  • FilteredIndex.kt:95 - every query copies and binds the whole active set
  • MergedIndex.kt:32 - per-source duplicate rows use up each backing limit
  • CombinedJarScanner.kt:98 - skipping all of META-INF drops version-only classes
  • JarSymbolScanner.kt:72 - nesting still guessed from '$' in the name
  • JvmSymbolDescriptor.kt:219 - deserialized key differs from the stored row key
  • KotlinCompletions.kt:578 - constructor and member rows use up the fetch budget

NITPICK - 1 inline, not listed

Stack. This is layer 2 of 4: #2071 <- #2072 (this) <- #2073 <- #2074. #2071 is below; #2073 and #2074 are above. Every claim was checked against the stack tip, 5f67f3eab0 (#2074's head). 11 of this PR's files change again higher up, including SQLiteIndex, FilteredIndex, CombinedJarScanner, JvmSymbolIndex and JvmLibraryIndexingService. Each finding here is still present at the tip, and none was dropped as already fixed higher up.

Pre-existing code. KotlinMetadataScanner.kt:317, KotlinCompletions.kt:652 and JarSymbolScanner.kt:72 are lines this PR did not write. They are raised because the PR changes what they feed: the (source, key) identity and dedupeKey, the exact-match-first completion stage, and the InnerClasses-based visibility. Each comment says so.

Prior rounds. None; this is the first review on this PR.

Verdict rule. This repo has no written approve/request-changes rule. CLAUDE.md ties the QA transition to "no outstanding critical, high, or medium findings", and REVIEW.md is coaching, not a gate, so the default applied: confirmed IMPORTANT findings mean request changes. The MINOR findings marked PLAUSIBLE (CombinedJarScanner.kt:98, KotlinCompletions.kt:578, FilteredIndex.kt:95, JarSymbolScanner.kt:72) are graded on the mechanism, without a reproduction.

@itsaky-adfa
itsaky-adfa force-pushed the perf/ADFA-6228-index-correctness branch from ea904ac to c29ca5f Compare October 7, 2026 13:50

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Stack: layer 2 of 4 (#2071 -> #2072 -> #2073 -> #2074). Comments are anchored at this PR's head c29ca5f; every claim was checked against the stack tip 780908a (#2074).

IMPORTANT

  • KotlinCompletions.kt:578 - rows the filter always rejects crowd out real unimported candidates (existing thread, raised from MINOR)
  • KotlinMetadataScanner.kt:332 - extension overloads share one key (existing thread)
  • KotlinCompletions.kt:661 - an unimported type alias is inserted without its import (existing thread)

MINOR

  • KotlinCompletions.kt:444 - the visibility walk runs before the cheap kind check
  • SQLiteIndex.kt:791 - a predicate on an undeclared field is silently dropped
  • FilteredIndex.kt:95 - the active set is copied and re-sorted on every query (existing thread)
  • MergedIndex.kt:32 - per-index limit, deduped afterwards (existing thread)
  • CombinedJarScanner.kt:98 - classes only under META-INF/versions are skipped (existing thread)
  • JarSymbolScanner.kt:72 - nesting guessed from '$' (existing thread)
  • JvmSymbolDescriptor.kt:219 - fromProto rebuilds a different key (existing thread)

NITPICK - 2 (1 inline, 1 in an existing thread)

Previous round, checked at the stack tip:

  • Fixed higher in the stack: the JarFile not closed when a scan is cancelled. #2073 wraps the scan in a CloseableSequence.
  • Not fixed, replied in thread: the other 9 findings.

Evidence (REVIEW.md):

  • Ticket: ADFA-6228 asks to stop duplicating the per-module ClassTrie. This layer makes the JVM symbol index correct enough to replace it; #2073 and #2074 make the switch. The IMPORTANT findings are completion results the index gives differently from what it replaces.
  • Exceptions: new failure paths in the scanners are caught and logged; nothing new reaches the crash handler.
  • Leaks: JAR handles on cancellation are fixed in #2073 (above). Not run on a device.
  • Threading: completion-path cost covered above (visibility walk, per-query set copies). StrictMode not run.
  • Security: JAR entry paths are read, not written; no zip-slip surface.
  • Tests: no test pins the unimported-completion starvation or the extension-key collision. Coverage not measured.
  • Accessibility, contextual help, plugins: no UI or plugin API changes.

Verdict rule: REVIEW.md describes itself as "a coaching doc, not a gate" and sets no approve/request-changes rule, so the default applied.

Comment thread lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndex.kt Outdated
@itsaky-adfa
itsaky-adfa force-pushed the perf/ADFA-6228-index-correctness branch from c29ca5f to fbca918 Compare October 8, 2026 13:39
@itsaky-adfa
itsaky-adfa force-pushed the perf/ADFA-6228-index-correctness branch from fbca918 to d919500 Compare October 8, 2026 14:15

@Daniel-ADFA Daniel-ADFA left a comment

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CRITICAL

  • none

IMPORTANT

  • none

MINOR

  • BackgroundIndexer.kt:134 - a three-job chain can still interleave writes
  • KotlinMetadataScanner.kt:174 - a $-prefixed nested class gets a containing class ending in $
  • JarSymbolScanner.kt:92 - a nested class's fqName turns every $ into .
  • InMemoryIndex.kt:98 - an undeclared field returns empty instead of throwing
  • KotlinCompletions.kt:440 - the visibility walk still runs before the receiver check (reply, partly fixed)
  • FilteredIndex.kt:95 - the active set is copied and sorted on every query (reply)
  • MergedIndex.kt:32 - repeated keys still count against the limit (reply)
  • CombinedJarScanner.kt:98 - classes only under META-INF/versions/ are dropped (reply)

NITPICK - 1 inline, 2 as replies, not listed

Stack: layer 2 of stage <- #2071 <- #2072 <- #2073 <- #2074. Claims were checked at this head (d919500) and at the stack tip (765c699), following renames (for example JvmLibraryIndexingService -> JarIndexingService).

Fixed since the last round, checked in the code at d919500:

  • A predicate on an undeclared field now throws (Query.kt:74-78, SQLiteIndex.kt:762); InMemoryIndex.distinctValues is the gap above.
  • Constructors, fields and member callables no longer crowd the unimported-symbol query (KotlinCompletions.kt:586-598).
  • Extension callables are keyed by their receiver (KotlinMetadataScanner.kt:332). Type arguments are still not in the key, so receivers that differ only in type arguments share a row; the import is the same, so this is harmless.
  • A type alias chosen from completion imports itself (KotlinCompletions.kt:643-647).
  • Java nesting comes from InnerClasses, not a $ in the name (JarSymbolScanner.kt:72, 89-90).
  • fromProto reads the stored key (JvmSymbolDescriptor.kt:59, 211).

Open at this head but fixed higher in the stack, so not posted:

  • A JAR scan that stops part-way left its JarFile open (round 1, CombinedJarScanner.kt:62); #2073 closes it through CloseableSequence (7ed612f).
  • FilteredIndex.setActiveSources clears and refills the set without a lock; #2073 replaces it with one volatile assignment.

Checked and not posted: the 999-parameter SQLite limit (the largest statement any caller builds is about 915 arguments), and key lookups taking the smallest source id rather than classpath order (no production caller depends on which duplicate wins).

No CRITICAL or IMPORTANT finding is open. The repo has no written approve/request-changes rule (REVIEW.md asks that a blocking comment name a concrete risk, and none of these does), and the requester asked to approve when only MINOR and NITPICK findings remain, so an approval follows.

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Approving: no CRITICAL or IMPORTANT finding is open at d919500, and the three IMPORTANT findings from the last round are fixed. The MINOR findings are in their threads and are safe to merge; the two $ naming ones (KotlinMetadataScanner.kt:174, JarSymbolScanner.kt:92) matter most once #2074 makes the index the only source for class lookups.

@itsaky-adfa
itsaky-adfa force-pushed the perf/ADFA-6228-index-correctness branch from d919500 to 6ad0976 Compare October 9, 2026 12:24
@itsaky-adfa
itsaky-adfa force-pushed the perf/ADFA-6228-index-correctness branch from 6ad0976 to 2214104 Compare October 12, 2026 13:51

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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at
@subprojects/javac-services/src/test/java/com/itsaky/androidide/javac/services/fs/CachingJarFileSystemProviderConcurrencyTest.kt:
- Line 75: In the concurrency test, ensure `start.countDown()` and
`executor.shutdown()` run in a `finally` block around the `ready.await`
assertion, so workers are released and the executor is shut down even if
readiness times out.

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📥 Commits

Reviewing files that changed from the base of the PR and between 4a39329 and 2214104.

📒 Files selected for processing (59)
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/FilteredIndex.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/InMemoryIndex.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/MergedIndex.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndex.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/api/Core.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/api/Index.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/api/Query.kt
  • lsp/indexing/src/main/kotlin/org/appdevforall/codeonthego/indexing/util/BackgroundIndexer.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/FilteredIndexLimitTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/FilteredIndexTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/InMemoryIndexTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/MergedIndexTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexAnalysisLimitTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexCancellationTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexFingerprintTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexIdentityTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexJournalTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexPrefixTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexQueryPlanTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexScopeTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/SQLiteIndexVersionTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/UndeclaredFieldQueryTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/api/IndexQueryBuilderTest.kt
  • lsp/indexing/src/test/kotlin/org/appdevforall/codeonthego/indexing/util/BackgroundIndexerTest.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/CombinedJarScanner.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/JarSymbolScanner.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmGeneratedIndexingService.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmLibraryIndexingService.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmSymbol.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmSymbolDescriptor.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmSymbolIndex.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/KotlinMetadataScanner.kt
  • lsp/jvm-symbol-index/src/main/kotlin/org/appdevforall/codeonthego/indexing/jvm/KtFileMetadataIndex.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/ClasspathTrieDifferentialTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/CombinedJarScannerMultiReleaseTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/JarFingerprintTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/JarSymbolScannerDollarNameTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/JarSymbolScannerVisibilityTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmSymbolIndexKindScopeTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/JvmSymbolIndexOptimizeTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/KotlinMetadataScannerDollarNameTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/KotlinMetadataScannerShapeTest.kt
  • lsp/jvm-symbol-index/src/test/kotlin/org/appdevforall/codeonthego/indexing/jvm/KotlinMetadataScannerVersionTest.kt
  • lsp/jvm-symbol-models/src/main/proto/jvm_symbol.proto
  • lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/actions/AddImportAction.kt
  • lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/index/KtSymbolIndex.kt
  • lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/index/SourceFileIndexer.kt
  • lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/completion/KotlinCompletions.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/actions/AddImportActionTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/compiler/index/IndexWorkerBatchRemovalTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/compiler/index/IndexWorkerDisposalTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/compiler/index/IndexWorkerPhaseLifecycleTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/compiler/index/SourceFileIndexerTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/completion/CollectUnimportedSymbolMatchesTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/completion/CollectUpToLimitTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/completion/UnimportedSymbolCandidateTest.kt
  • lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/fixtures/KtLspTestEnvironment.kt
  • subprojects/javac-services/src/main/java/com/itsaky/androidide/javac/services/fs/CachingJarFileSystemProvider.kt
  • subprojects/javac-services/src/test/java/com/itsaky/androidide/javac/services/fs/CachingJarFileSystemProviderConcurrencyTest.kt

Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 1 remain after this review.

A ClassTrie is per module while the symbol index is global and keyed by JAR
path, so "classes on module X's classpath" needs `sourceId IN (X's JARs)`,
which a single `sourceId` cannot express.

The scoped SELECT is chunked the way `removeBySources` already chunks its
DELETE, because a module's classpath can exceed SQLite's bound-parameter limit.
Chunks are disjoint on `_source_id`, so no row is returned twice and each
statement can take what remains of the limit.

`null` and an empty collection mean different things: no restriction at all
versus a scope that admits nothing. Keeping them distinct is what lets a caller
pass a computed scope without having to special-case the empty result.
A defect on stage, not a consequence of the index migration, but fixed here
because moving completion onto this index would otherwise inherit it.

`FilteredIndex.query` called `backing.query(query)`, which had already appended
`LIMIT` in SQL, and only then dropped rows from inactive sources. So a query for
200 could return zero while hundreds of matching active rows sat past the SQL
limit -- the limit was spent on rows the caller was never allowed to see.

The fix rewrites the query's scope instead of filtering its results, so the
limit counts only rows that already survived filtering. No second filter is
layered on top; that would just move the problem.

That changes the extension contract. Testing one id is no longer enough,
because the scope now has to be *described* to the backing index. So
`visibleSourceIds` is the overridable member, `null` means every source is
visible, and `isActive` derives from it and is final -- an override that could
not be honoured now fails to compile instead of silently hiding every entry.

`get` and `containsSource` are unaffected: both are point operations with no
limit to spend, and tests pin that they still refuse an inactive source.
The consumers that navigate the package tree do not look names up; they ask
what sits directly under a package. Answering that needs every package under a
prefix, and the existing `distinctValues(field)` takes no query at all -- no
source scope, no prefix -- so the only way to narrow it was to fetch the
matching entries and reduce them in memory, which is the materialisation this
work exists to avoid.

`distinctValues(field, query)` scans one column instead. Values are
deduplicated across source chunks as well as by SQL, since DISTINCT applies
only within a statement and one package name legitimately appears in many JARs.

It also closes the gap `FilteredIndex.distinctValues` documented in a comment:
it passed straight through to the backing index, so it reported values from
sources that were not active. It now carries the same scope as `query`.

Dropping `InMemoryIndex`'s own override removes a stale-value bug with it --
that one read the field map's keys, which retain a value after its last entry
has been removed.
… _ as a wildcard

`LIKE 'prefix%'` cannot use the column's index here. SQLite only rewrites LIKE
into a range scan when `case_sensitive_like` is on or the column collates
NOCASE, and this schema has neither, so every prefix query was a full table
scan. Measured against a 400k-row table shaped like the JVM symbol index, the
range form answers the same query in 0.04ms against 3.9ms - and this runs on
every completion keystroke.

The escaped LIKE stays beside the range bounds as the semantic guard. `_` and
`%` are legal identifier characters, so an unescaped pattern silently widened
the match: a prefix of `my_f` also returned `myXfield`.

The prefix match on a non-prefix-searchable column was case-insensitive, which
contradicted both its own comment and `InMemoryIndex`, whose fallback has
always used `startsWith`. The two agree now.
…e KDoc

visibleSourceIds() is the only extension point since filtering reads it, not
isActive(); activeSources() itself is no longer meant to be overridden.
… bound

- Make the source-id chunk size an internal constructor parameter so a small
  size can exercise the multi-statement path in tests; Robolectric's SQLite
  allows far more than 999 bound parameters, so the existing 2100-id test
  passed even with chunking deleted.
- Query each distinctValues chunk with the full limit instead of the
  remaining budget: a value repeating across chunks could otherwise exhaust
  that budget before a later chunk's still-unseen values were read.
- Increment exclusiveUpperBound by Unicode code point instead of raw UTF-16
  code unit: incrementing only a supplementary character's trailing low
  surrogate produced a bound below the prefix itself, so a matching row was
  excluded outright.
- Fix the escaped LIKE guard's stale rationale: the range already rejects a
  literal '_' or '%' substituted for another character; the LIKE guard only
  matters when the range's bound is carried or absent.
A new indexSource call now cancelAndJoin's the previous job for that
source before deleting its rows, so a superseded pass can never write
after the new one has already replaced them. A call whose fingerprint
matches an already-running job is folded into that job instead of
restarting it, and a job that loses the race no longer clears the
newer job's active-job entry on its own completion.
SQLiteIndex.insertBatched never checked cancellation, and its mutex's
uncontended fast path never suspends, so a cancelled indexing job kept
committing batches until its scan finished. Adding an explicit check
before each transaction bounds how much a superseded job can still
write once cancelled.
JvmGeneratedIndexingService skipped a JAR once any row existed for its
path, so a JAR rewritten outside an in-app build, or left half-indexed
by a killed process, stayed stale until the next build touched it.
Reusing the library indexer's size+mtime fingerprint means the
unconditional re-index on every build completion is no longer needed
either: a JAR whose fingerprint didn't change is now skipped there too.

Documents jarFingerprint's accepted limitation: a same-size rewrite
within the filesystem's mtime granularity goes undetected.
createFs read the cache and then put, so several callers racing on one path
each built a file system. Only the last reached the map; the others were never
closed while a walk still held them, and the JARs most exposed to it are the
most shared ones - kotlin-stdlib is named by 76 of this repository's modules.
32 threads racing createFs for the same JAR path each get a distinct
CachedJarFileSystem on the pre-fix get-then-put code; computeIfAbsent
guarantees they all get the same instance.
The class file header cannot carry private, protected or static, so every
private nested class was indexed as package-private and every static nested
class as inner. Kotlin completion derived isNested from isInner, which would
have flipped for static nested classes, so it now uses isTopLevel.
…a corpus

The kotlin-stdlib comparison found two defects when it was written:
anonymous Kotlin classes surfacing as top-level classes named `1`, and
`module-info` from a multi-release JAR indexed as a class. JUnit 4 adds
package-private, anonymous and nested Java classes to the same oracle.
With one shared cap over three prefix-only queries (source, generated,
library), a short prefix could let the source and generated indexes fill
the cap before the library index was ever queried, crowding out an exact
match on the class the user is actually typing. Collect an exact
simple-name match from every index first, then fill the remainder of the
cap with prefix matches, deduplicated by qualified name (by full key for
a callable, since two overloads share a qualified name) so a class
indexed from two JARs on the active source set is offered once.
… drop stray em dashes

These lines predate this branch but sit in files it touches; none has an owning
commit here to fold into. Also drops a stale internal ticket reference from one
comment while rewording it.
Extension overloads that differ only by receiver, such as Iterable<T>.first()
and List<T>.first(), shared one key, so each source kept only the last one.
The key is now stored in the payload as well: rebuilding it on read could not
recover the receiver, and completion dedupes callables by key.
Constructors, Java fields and member functions were fetched and then always
rejected, and with no ORDER BY they could fill the whole prefix budget, so a
prefix like `get` lost real candidates such as stdlib extensions.
…he name

Generated top-level classes such as Foo$$ViewBinder and $AutoValue_Foo were
indexed as nested and never offered as top-level classes. Folded into the
format version 3 bump this layer already makes.
@itsaky-adfa
itsaky-adfa force-pushed the perf/ADFA-6228-index-correctness branch from 2214104 to c72fa57 Compare October 13, 2026 05:38
@itsaky-adfa
itsaky-adfa merged commit 907ad97 into stage Oct 13, 2026
5 checks passed
@itsaky-adfa
itsaky-adfa deleted the perf/ADFA-6228-index-correctness branch October 13, 2026 07:35
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3 participants