Kotlin: support 2.4.20-RC2 - #22404
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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Kotlin 2.4.20-RC removes the remaining ComponentRegistrar API under KT-85816. Use an RC-specific registrar that only implements CompilerPluginRegistrar, and package the legacy ComponentRegistrar service only for older compilers. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Kotlin 2.4.20-RC marks public K1 APIs with K1Deprecation under KT-86046 and rejects the previous repeatable-annotation IR access path. Opt in to K1Deprecation for 2.4.20 and later, and use the existing annotationClass compatibility extension. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Kotlin 2.4.20-RC assigns synthetic source offsets to generated interface forwarders. Use the enclosing class location for each fabricated forwarder and its generated body and accesses, preserving existing database and query output. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Replace the previous 2.4.20-RC dependency set and compatibility marker with RC2 while preserving existing extraction output. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Bumped artifacts to Kotlin 2.4.20-RC2 |
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Copilot review overview
Review tier: Balanced
Findings: None
What changed in this PR
Adds preliminary Kotlin 2.4.20-RC2 extractor support while continuing to reject Kotlin 2.4.20 GA.
Changes:
- Adds RC2 compiler dependencies and extractor variants.
- Adapts compiler registration, annotations, and synthetic forwarder locations.
- Updates defaults, diagnostics, documentation, and release notes.
| File | Description |
|---|---|
MODULE.bazel |
Registers RC2 dependency repositories. |
java/ql/lib/change-notes/2026-08-21-kotlin-2.4.20.md |
Announces preliminary support. |
java/ql/integration-tests/kotlin/all-platforms/diagnostics/kotlin-version-too-new/fake-kotlinc-source/kotlin/KotlinVersion.java |
Tests the GA rejection boundary. |
java/ql/integration-tests/kotlin/all-platforms/diagnostics/kotlin-version-too-new/diagnostics.expected |
Updates the expected diagnostic. |
java/kotlin-extractor/versions.bzl |
Adds the RC2 extractor version. |
java/kotlin-extractor/src/main/kotlin/utils/versions/v_2_4_20-RC2/Kotlin2ComponentRegistrar.kt |
Implements the supported registrar API. |
java/kotlin-extractor/src/main/kotlin/MetaAnnotationSupport.kt |
Uses compatible annotation-class access. |
java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt |
Stabilizes generated forwarder locations. |
java/kotlin-extractor/dev/wrapper.py |
Makes RC2 the development default. |
java/kotlin-extractor/deps/kotlin-stdlib-2.4.20-RC2.jar |
Adds the RC2 standard library artifact. |
java/kotlin-extractor/deps/kotlin-compiler-embeddable-2.4.20-RC2.jar |
Adds the embeddable compiler artifact. |
java/kotlin-extractor/deps/kotlin-compiler-2.4.20-RC2.jar |
Adds the standalone compiler artifact. |
java/kotlin-extractor/BUILD.bazel |
Configures version-specific APIs and services. |
docs/codeql/reusables/supported-versions-compilers.rst |
Documents preliminary RC2 support. |
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Summary
Support Kotlin 2.4.20-RC2 in the Kotlin extractor. Kotlin 2.4.20 GA remains unsupported.
The implementation is split between release-driven compatibility changes and two observed RC2 behaviours. The release changelog explicitly removes remaining
ComponentRegistrarusage (KT-85816) and applies@K1Deprecationto public K1 APIs (KT-86046). The RC2 compiler also gives generated interface forwarders synthetic source offsets and rejects the previous repeatable-annotation access path. The extractor adapts to those behaviours without changing query results.Motivation for each change
v2.4.20-RC2compiler rather than an inferred compatible version.CompilerPluginRegistrarimplementationComponentRegistraris absent from the 2.4.20 compiler, matching KT-85816. The existing registrar cannot be loaded because it implements both APIs.ComponentRegistrarservice only before 2.4.20org.jetbrains.kotlin.K1Deprecationfrom 2.4.20annotationClasscompatibility extensionconstructedClassand also compiles with the oldest supported Kotlin 1.8.0 compiler.Compatibility
Validation
VERSIONSv2.4.20-RC2compiler passed the Kotlin basic functionality extraction test2.4.20GANo tests are disabled. The only changed generated expectation is the too-new diagnostic.