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This PR updates vm/ByteCodeTranslator to support the invokedynamic instruction, specifically targeting the usage pattern of Java 8 javac for lambdas and method references.

It achieves this by:

  1. Intercepting invokedynamic instructions in Parser.java.
  2. Generating a synthetic class (e.g., EnclosingClass_lambda_0) that implements the target functional interface.
  3. Generating a factory method in this synthetic class that constructs an instance, capturing any necessary variables.
  4. Replacing the invokedynamic instruction with an INVOKESTATIC call to the generated factory method.

It also includes a comprehensive integration test LambdaIntegrationTest that compiles a Java class with lambdas, translates it using the updated ByteCodeTranslator, and compiles/runs the resulting C code to verify correctness.

Additionally, vm/JavaAPI/pom.xml was updated to Java 1.8 to allow building in environments with newer JDKs.


PR created automatically by Jules for task 17421991296738788070 started by @shai-almog

…s and method references.

- Implemented `visitInvokeDynamicInsn` in `Parser.java` to translate lambda expressions and method references into static proxy classes.
- Updated `vm/JavaAPI/pom.xml` to use source/target 1.8 to support newer build environments and lambdas.
- Added `LambdaIntegrationTest.java` in `vm/tests` to verify end-to-end compilation and execution of Java 8 lambda code translated to C.
- Handled generation of necessary stubs (`java.lang.invoke`, `java.util.Objects`) in integration tests.
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github-actions bot commented Dec 16, 2025

✅ Continuous Quality Report

Test & Coverage

Static Analysis

Generated automatically by the PR CI workflow.

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shai-almog commented Dec 16, 2025

iOS screenshot updates

Compared 30 screenshots: 0 matched, 3 updated, 27 missing references.

  • BrowserComponent — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

    BrowserComponent
    Preview info: Preview provided by instrumentation.
    Full-resolution PNG saved as BrowserComponent.png in workflow artifacts.

  • graphics-affine-scale — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-affine-scale.png.

    graphics-affine-scale
    Preview info: JPEG preview quality 40; JPEG preview quality 40; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-affine-scale.png in workflow artifacts.

  • graphics-clip — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-clip.png.

    graphics-clip
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    Full-resolution PNG saved as graphics-clip.png in workflow artifacts.

  • graphics-draw-arc — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-draw-arc.png.

    graphics-draw-arc
    Preview info: JPEG preview quality 20; JPEG preview quality 20; downscaled to 603x1311.
    Full-resolution PNG saved as graphics-draw-arc.png in workflow artifacts.

  • graphics-draw-gradient — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-draw-gradient.png.

    graphics-draw-gradient
    Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-draw-gradient.png in workflow artifacts.

  • graphics-draw-image-rect — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-draw-image-rect.png.

    graphics-draw-image-rect
    Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 603x1311.
    Full-resolution PNG saved as graphics-draw-image-rect.png in workflow artifacts.

  • graphics-draw-line — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-draw-line.png.

    graphics-draw-line
    Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 603x1311.
    Full-resolution PNG saved as graphics-draw-line.png in workflow artifacts.

  • graphics-draw-rect — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-draw-rect.png.

    graphics-draw-rect
    Preview info: JPEG preview quality 20; JPEG preview quality 20; downscaled to 603x1311.
    Full-resolution PNG saved as graphics-draw-rect.png in workflow artifacts.

  • graphics-draw-round-rect — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-draw-round-rect.png.

    graphics-draw-round-rect
    Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-draw-round-rect.png in workflow artifacts.

  • graphics-draw-shape — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-draw-shape.png.

    graphics-draw-shape
    Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-draw-shape.png in workflow artifacts.

  • graphics-draw-string — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-draw-string.png.

    graphics-draw-string
    Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 422x918.
    Full-resolution PNG saved as graphics-draw-string.png in workflow artifacts.

  • graphics-draw-string-decorated — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-draw-string-decorated.png.

    graphics-draw-string-decorated
    Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 603x1311.
    Full-resolution PNG saved as graphics-draw-string-decorated.png in workflow artifacts.

  • graphics-fill-arc — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-fill-arc.png.

    graphics-fill-arc
    Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-fill-arc.png in workflow artifacts.

  • graphics-fill-polygon — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-fill-polygon.png.

    graphics-fill-polygon
    Preview info: JPEG preview quality 30; JPEG preview quality 30; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-fill-polygon.png in workflow artifacts.

  • graphics-fill-rect — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-fill-rect.png.

    graphics-fill-rect
    Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-fill-rect.png in workflow artifacts.

  • graphics-fill-round-rect — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-fill-round-rect.png.

    graphics-fill-round-rect
    Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-fill-round-rect.png in workflow artifacts.

  • graphics-fill-shape — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-fill-shape.png.

    graphics-fill-shape
    Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-fill-shape.png in workflow artifacts.

  • graphics-fill-triangle — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-fill-triangle.png.

    graphics-fill-triangle
    Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-fill-triangle.png in workflow artifacts.

  • graphics-rotate — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-rotate.png.

    graphics-rotate
    Preview info: JPEG preview quality 40; JPEG preview quality 40; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-rotate.png in workflow artifacts.

  • graphics-scale — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-scale.png.

    graphics-scale
    Preview info: JPEG preview quality 60; JPEG preview quality 60; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-scale.png in workflow artifacts.

  • graphics-stroke-test — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-stroke-test.png.

    graphics-stroke-test
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    Full-resolution PNG saved as graphics-stroke-test.png in workflow artifacts.

  • graphics-tile-image — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-tile-image.png.

    graphics-tile-image
    Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 422x918.
    Full-resolution PNG saved as graphics-tile-image.png in workflow artifacts.

  • graphics-transform-camera — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-transform-camera.png.

    graphics-transform-camera
    Preview info: JPEG preview quality 50; JPEG preview quality 50; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-transform-camera.png in workflow artifacts.

  • graphics-transform-perspective — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-transform-perspective.png.

    graphics-transform-perspective
    Preview info: JPEG preview quality 40; JPEG preview quality 40; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-transform-perspective.png in workflow artifacts.

  • graphics-transform-rotation — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-transform-rotation.png.

    graphics-transform-rotation
    Preview info: JPEG preview quality 50; JPEG preview quality 50; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-transform-rotation.png in workflow artifacts.

  • graphics-transform-translation — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-transform-translation.png.

    graphics-transform-translation
    Preview info: JPEG preview quality 40; JPEG preview quality 40; downscaled to 844x1835.
    Full-resolution PNG saved as graphics-transform-translation.png in workflow artifacts.

  • kotlin — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/kotlin.png.

    kotlin
    Preview info: Preview provided by instrumentation.
    Full-resolution PNG saved as kotlin.png in workflow artifacts.

  • landscape — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/landscape.png.

    landscape
    Preview info: Preview provided by instrumentation.
    Full-resolution PNG saved as landscape.png in workflow artifacts.

  • MainActivity — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

    MainActivity
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    Full-resolution PNG saved as MainActivity.png in workflow artifacts.

  • MediaPlayback — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

    MediaPlayback
    Preview info: Preview provided by instrumentation.
    Full-resolution PNG saved as MediaPlayback.png in workflow artifacts.

…s and method references.

- Implemented `visitInvokeDynamicInsn` in `Parser.java` to translate lambda expressions and method references into static proxy classes.
- Added `LambdaIntegrationTest.java` in `vm/tests` to verify end-to-end compilation and execution of Java 8 lambda code translated to C.
- Handled generation of necessary stubs (`java.lang.invoke`, `java.util.Objects`, `virtual_java_lang_Object_getClass`) in integration tests to support method references and implicit null checks.
- Ensured generated lambda classes are registered to prevent dead code elimination.
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✅ ByteCodeTranslator Quality Report

Test & Coverage

  • Tests: 32 total, 0 failed, 0 skipped
  • ⚠️ Coverage report not generated.

Static Analysis

  • ✅ SpotBugs: no findings (report was not generated by the build).
  • ⚠️ PMD report not generated.
  • ⚠️ Checkstyle report not generated.

Generated automatically by the PR CI workflow.

@shai-almog shai-almog marked this pull request as ready for review December 16, 2025 11:16
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@shai-almog shai-almog merged commit fc36b02 into master Dec 16, 2025
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2 participants