Emit class stubs and headers for default interface methods and add test assertions

[shai-almog]

Motivation

• Interface default methods produced concrete implementations in the interface C output but did not always emit corresponding class-level stubs and header declarations for non-interface implementing classes, causing missing-symbol errors at native compile time when code referenced the class-level stub (e.g., for super calls).

Description

• Added hasMethodInBaseClass, appendDefaultInterfaceStubs, and appendDefaultInterfaceStubHeaders to ByteCodeClass to walk interface hierarchies and emit class-level stubs and header declarations for concrete default interface methods while skipping abstract/static/private methods.
• Integrated default-interface stub emission into the class C generation and header generation paths by calling the new helpers alongside existing super-stub generation, and changed the logic to only append super stubs when a base class exists.
• The new logic prevents emitting stubs when a base class already supplies the same implementation to avoid accidental overrides.
• Updated ParserTest.translatesDefaultInterfaceMethodImplementations to assert that the implementing class C contains the concrete stub symbol and that the implementing class header declares the stub.

Testing

• Added assertions in vm/tests/src/test/java/com/codename1/tools/translator/ParserTest.java to verify the implementing class emits the concrete stub and header declaration for default interface methods, but no automated test suite was executed for this patch.
• No CI or unit test runs were performed as part of this change (tests were updated but not run).

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Codex Task

[github-actions]

✅ ByteCodeTranslator Quality Report

Test & Coverage

• ✅ Tests: 171 total, 0 failed, 2 skipped

Benchmark Results

• Execution Time: 10163 ms

• Hotspots (Top 20 sampled methods):

  • 21.70% java.lang.String.indexOf (382 samples)
  • 18.24% com.codename1.tools.translator.Parser.isMethodUsed (321 samples)
  • 14.94% com.codename1.tools.translator.Parser.addToConstantPool (263 samples)
  • 8.41% java.util.ArrayList.indexOf (148 samples)
  • 4.43% java.lang.Object.hashCode (78 samples)
  • 3.75% com.codename1.tools.translator.ByteCodeClass.calcUsedByNative (66 samples)
  • 2.78% com.codename1.tools.translator.ByteCodeClass.fillVirtualMethodTable (49 samples)
  • 2.61% java.lang.System.identityHashCode (46 samples)
  • 2.16% com.codename1.tools.translator.BytecodeMethod.optimize (38 samples)
  • 1.25% java.lang.AbstractStringBuilder.append (22 samples)
  • 1.14% java.lang.StringBuilder.append (20 samples)
  • 0.97% com.codename1.tools.translator.Parser.cullMethods (17 samples)
  • 0.97% com.codename1.tools.translator.Parser.generateClassAndMethodIndexHeader (17 samples)
  • 0.91% java.io.FileOutputStream.open0 (16 samples)
  • 0.80% com.codename1.tools.translator.ByteCodeClass.markDependent (14 samples)
  • 0.74% java.io.FileInputStream.open0 (13 samples)
  • 0.57% java.io.FileOutputStream.writeBytes (10 samples)
  • 0.45% com.codename1.tools.translator.ByteCodeField.equals (8 samples)
  • 0.45% com.codename1.tools.translator.BytecodeMethod.equals (8 samples)
  • 0.45% java.util.Hashtable.get (8 samples)

• ⚠️ 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.

[github-actions]

✅ Continuous Quality Report

Test & Coverage

• ✅ Tests: 2282 total, 0 failed, 0 skipped
• 📊 Line coverage: 52.79% [HTML preview] [Download]
  • Lowest covered classes
    • com.codename1.io.rest.RequestBuilder$FetchAsPropertyListActionListener – 0.00%
    • com.codename1.io.rest.RequestBuilder$FetchAsPropertiesActionListener – 0.00%
    • com.codename1.ui.Display$EdtException – 0.00%
    • com.codename1.ui.BrowserWindow$BrowserForm – 0.00%
    • com.codename1.ui.plaf.CSSBorder$LinearGradient – 0.00%
    • com.codename1.io.rest.RequestBuilder$GetAsStringAsyncImplActionListener – 0.00%
    • com.codename1.io.rest.RequestBuilder$GetAsJsonMapActionListener – 0.00%
    • com.codename1.payment.Purchase$SynchronizeReceiptsSyncRunnable – 0.00%
    • com.codename1.io.rest.RequestBuilder$GetAsBytesAsyncImplActionListener – 0.00%
    • com.codename1.io.rest.RequestBuilder$FetchAsJsonMapActionListener – 0.00%

Static Analysis

• ✅ SpotBugs: 0 findings (no issues) [Report archive]
• ❌ PMD: 6225 findings (P1: 48, P2: 42, P3: 5833, P4: 302) [HTML preview] [Download]
  • Top findings
    • P1: CodenameOne/src/com/codename1/components/FileEncodedImage.java:123 – Return an empty collection rather than null. (rule: ReturnEmptyCollectionRatherThanNull)
    • P1: CodenameOne/src/com/codename1/components/FileEncodedImageAsync.java:160 – Return an empty collection rather than null. (rule: ReturnEmptyCollectionRatherThanNull)
    • P1: CodenameOne/src/com/codename1/components/StorageImageAsync.java:95 – Return an empty collection rather than null. (rule: ReturnEmptyCollectionRatherThanNull)
    • P1: CodenameOne/src/com/codename1/components/StorageImageAsync.java:119 – Return an empty collection rather than null. (rule: ReturnEmptyCollectionRatherThanNull)
    • P1: CodenameOne/src/com/codename1/impl/CodenameOneImplementation.java:5527 – Return an empty collection rather than null. (rule: ReturnEmptyCollectionRatherThanNull)
    • …and 6220 more
• ❌ Checkstyle: 220771 findings (Warning: 220771) [HTML preview] [Download]
  • Top findings
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:30:1 – Extra separation in import group before 'java.io.IOException' (rule: CustomImportOrderCheck)
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:32 – First sentence of Javadoc is missing an ending period. (rule: SummaryJavadocCheck)
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:36 – Line is longer than 100 characters (found 143). (rule: LineLengthCheck)
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:39:5 – 'member def modifier' has incorrect indentation level 4, expected level should be 2. (rule: IndentationCheck)
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:40:5 – 'member def modifier' has incorrect indentation level 4, expected level should be 2. (rule: IndentationCheck)
    • …and 220766 more

Generated automatically by the PR CI workflow.

[shai-almog]

iOS screenshot updates

Compared 30 screenshots: 23 matched, 6 updated, 1 missing reference.

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

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

• graphics-draw-arc — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

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

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

  
  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-string — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

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

  
  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.

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

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

Benchmark Results

• VM Translation Time: 365 seconds
• Compilation Time: 100 seconds

Detailed Performance Metrics

Metric	Duration
Build Time Statistics
Setup & Unzip	36843 ms
Extract Extensions	24 ms
Google Services Setup	2 ms
Scan Classes	957 ms
Extract Libs	1383 ms
Inject Build Hints	45 ms
Generate Unit Tests	3 ms
Generate Stubs	1217 ms
Compile Stubs	2695 ms
Generate Icons	1432 ms
Prepare ParparVM	222 ms
ParparVM Execution	205529 ms
Post-VM Setup	219 ms
CocoaPods	6933 ms
Finalize	44 ms
Total Time	257553 msMaven Overhead : 108000 ms
CocoaPods Install (Script)	2000 ms
Simulator Boot (Run)	79000 ms
App Install	12000 ms
App Launch	7000 ms
Test Execution	144000 ms