[itsaky-adfa]

ADFA-6858

Kotlin source declaration lookups no longer walk every PSI tree in the package.

Changes

• AbstractDeclarationProvider reads top-level declarations (KtFile.declarations, plus class bodies for ClassId lookups) instead of PsiTreeUtil.collectElementsOfType over each file. The helpers in TopLevelDeclarations.kt return lazy sequences, and callers consume them under project.read.
• New PackageFileCache caches each package's VirtualFile list. It is capped at 2,000 files and invalidated by a new KtFileMetadataIndex write listener, by package and by path.
• KtSymbolIndex.removeFromIndex now also evicts the cached KtFile.
• Deleting or renaming a .kt file in the IDE now removes it from the index. Before, the guard used isKotlinFile, which needs the file to exist, so these events were dropped.

Review by commit: 165b23f002 only reformats DocumentUtils.java with Spotless, including an Eclipse member sort.

Known limitations

• The cache costs about 570 B per file, so 2,000 files is about 1.1 MB worst case, above the 1 MB budget. This trade-off was accepted.
• No unit test covers the delete/rename routing in KotlinLanguageServer; it is checked on device only.
• A .kt -> .kt rename now reaches onFileMoved, which production never called before.
• Deleting a .kt outside every module's source roots clears the whole analysis cache.
• An index write listener that throws is not caught; the only listener cannot throw.

Testing

• :lsp:kotlin (624 tests), :lsp:jvm-symbol-index, :shared and spotlessCheck pass.
• New tests:
  • TopLevelDeclarationsEquivalenceTest: old walk vs new, across all 18 source packages
  • PrivateTopLevelResolutionTest
  • KtFileMetadataIndexWriteListenerTest
  • PackageFileCacheTest
  • DeclarationStalenessTest
  • KotlinFileRemovalTest
  • DocumentUtilsKotlinPathTest
• Each regression test was shown to fail with its fix reverted; the logs are in the commit bodies.
• Device (moto g34): TODO. Add completion timings, cache footprint, and delete/rename of an open file.

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[coderabbitai]

Summary

• Replace package-wide PSI-tree traversal with lazy declaration lookups. Read top-level declarations and inspect nested class and object members for ClassId queries. Consume lookup sequences inside project.read.
• Cache package VirtualFile lists with a 2,000-file limit. Invalidate affected entries after metadata-index writes. Evict a file’s cached disk copy when KtSymbolIndex removes it.
• Handle Kotlin file creation and removal in AbstractCompilationEnvironment. Detect deleted and renamed-away Kotlin paths by extension, even when the paths no longer exist.
• Add tests for lookup equivalence, stale declarations, cache invalidation and races, index write notifications, private declarations, and Kotlin file removal.
• Risks: The cache may use about 1.1 MB at its configured limit, above the stated 1 MB budget. Deleting a .kt file outside module source roots clears the full analysis cache. Exceptions from index write listeners are not caught. No unit test covers delete or rename routing in KotlinLanguageServer.
• Validation reported by the author: :lsp:kotlin (624 tests), :lsp:jvm-symbol-index, :shared, and spotlessCheck pass. Testing on a moto g34, including completion timings, cache footprint, and deletion or rename of an open file, remains pending.

The metadata index now emits write notifications. Kotlin file lifecycle handling resolves environments from paths and updates index and analysis state. Package-file queries use a bounded cache, and declaration lookup uses Kotlin-file query helpers under project read access.

Changes: Kotlin Index and Declaration Flow

Layer / File(s)	Summary
Metadata write events lsp/jvm-symbol-index/.../KtFileMetadataIndex.kt, lsp/jvm-symbol-index/.../KtFileMetadataIndexWriteListenerTest.kt	The metadata index reports upserts, removals, and clears to registered listeners after each write. Tests cover event data, ordering, visibility, and listener closure.
Kotlin file lifecycle handling shared/src/main/java/.../DocumentUtils.java, shared/src/test/.../DocumentUtilsKotlinPathTest.kt, lsp/kotlin/.../KotlinLanguageServer.kt, lsp/kotlin/.../compiler/Compiler.kt, lsp/kotlin/.../compiler/AbstractCompilationEnvironment.kt, lsp/kotlin/.../compiler/CompilationEnvironment.kt, lsp/kotlin/src/test/.../KotlinFileRemovalTest.kt	Kotlin extension checks identify deleted or renamed paths without requiring them to exist. The compiler resolves environments from paths. File creation and removal update index and analysis state. Tests cover removal of deleted and open files.
Cached package and declaration queries lsp/kotlin/.../compiler/index/*, lsp/kotlin/.../compiler/services/DeclarationsProvider.kt, lsp/kotlin/.../compiler/services/TopLevelDeclarations.kt, lsp/kotlin/src/test/.../compiler/index/PackageFileCacheTest.kt, lsp/kotlin/src/test/.../compiler/services/*Test.kt	KtSymbolIndex caches package source-file queries and resolves indexed paths to virtual files. Declaration queries use Kotlin-file lookup helpers under read access. Tests cover cache invalidation, lookup equivalence, and resolution changes across file edits.

Estimated code review effort: 4 (Complex) | ~45 minutes

Sequence Diagram(s)

sequenceDiagram
  participant DeclarationsProvider
  participant KtSymbolIndex
  participant PackageFileCache
  participant KtFileMetadataIndex
  DeclarationsProvider->>KtSymbolIndex: Request source files for package
  KtSymbolIndex->>PackageFileCache: Look up package files
  PackageFileCache->>KtSymbolIndex: Query package on cache miss
  KtSymbolIndex->>KtFileMetadataIndex: Read indexed package paths
  KtFileMetadataIndex-->>KtSymbolIndex: Return indexed paths
  KtSymbolIndex-->>PackageFileCache: Return resolved source files
  PackageFileCache-->>DeclarationsProvider: Return cached source files
  KtFileMetadataIndex->>PackageFileCache: Send write event and invalidate entries

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Possibly related PRs

• appdevforall/CodeOnTheGo#2176: Changes Kotlin file lifecycle handling and rename processing in the same LSP paths.

Suggested reviewers: daniel-adfa

Merge Risk: Minimal · up to 099b2

No verified current-head issue remains that should block merging.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 28.57% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly and concisely identifies the main change: avoiding whole-package PSI parses during Kotlin declaration lookups.
Description check		The description directly explains the Kotlin declaration lookup changes, cache behavior, index updates, limitations, and testing performed.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 28.57% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 14 functions across 18 files.

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

Finishing Touches

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_{A rabbit checks the index rows,
And hears the write events as they go.
New paths join the package cache,
Old paths leave when files detach.
Declarations hop from file to file,
While tidy scopes refresh in style.}

[coderabbitai]

• Fix comments: Fix CodeRabbit comments on this PR

[Daniel-ADFA]

IMPORTANT

• DeclarationsProvider.kt:136 - lookups still parse every file in the package; ticket scope and done-when not met

MINOR

• AbstractCompilationEnvironment.kt:418 - deleting a .kt in no module drops every FIR session
• KotlinLanguageServer.kt:479 - deleting a folder leaves its .kt files indexed
• KotlinLanguageServer.kt:527 - the open-file branch of onFileMoved cannot run for IDE renames
• PackageFileCache.kt:48 - every edit reindex evicts the edited package
• KotlinFileRemovalTest.kt:94 - the test does not pin module-scoped invalidation

NITPICK - 2 inline, not listed

Previous round: CodeRabbit's PackageFileCache.kt:31 finding (path conversions under the lock on every write) is still open at 872939e; replied in its thread.

Evidence (read at 872939e; nothing built or run):

• Ticket ADFA-6858: the full PSI walk is gone (top-level declarations only) and package file lists are cached. The scope item "parse only files that declare the requested name" is not implemented, and the done-when profile and timings are TODO (IMPORTANT above). REVIEW.md treats both as blocking.
• Exceptions: a throwing index write listener is not isolated; the description lists it, and the only listener cannot throw, so not posted.
• Leaks: the cache's write listener is closed in KtSymbolIndex.close; the old path's in-memory file after a rename is noted above.
• Threading: every provider lookup now runs under project.read, and the cache's generation counter keeps a lookup that raced a write from being cached.
• Security: no untrusted input added.
• Tests: seven new test classes; not run here.
• Architecture: no new module edges; Caffeine was already a dependency. No plugin-api change.
• Checked and dropped: a deleted file is not served from the stale package list, because getKtFile returns null once the file is gone.

[coderabbitai]

---

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Failed pre-merge checks:
- Docstring Coverage:
Write docstrings for the functions missing them to satisfy the coverage
threshold.

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Commits

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Files selected for processing: 1

• shared/src/main/java/com/itsaky/androidide/utils/DocumentUtils.java

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