IncompatibleClassChangeError bug

Remi Forax forax at univ-mlv.fr
Wed Jul 18 20:39:37 UTC 2018


Hi all,
a build from 39a2d3a3b101 breaks my tests with an IncompatibleClassChangeError.
I have isolated the issue:

---
import java.util.function.IntFunction;

public class ArrayGeneratorBug {

  static __ByValue class Foo {
    private final int x;
    
    public Foo(int x) {
      this.x = x;
    }
  }
  
  private static <T> T[] gen(IntFunction<T[]> arrayCreator) {
    return arrayCreator.apply(0);
  }
  
  public static void main(String[] args) {
    Foo[] array = gen(Foo[]::new);
    System.out.println(array); 
  }
}
---

At runtime something goes wrong:

/usr/jdk/jdk-11-lworld/bin/java -XX:+EnableValhalla ArrayGeneratorBug 
Exception in thread "main" java.lang.IncompatibleClassChangeError: signature (I)[LArrayGeneratorBug$Foo; inconsistent value type: ArrayGeneratorBug$$Lambda$1/0x0000000800060840 ArrayGeneratorBug
	at ArrayGeneratorBug.gen(ArrayGeneratorBug.java:14)
	at ArrayGeneratorBug.main(ArrayGeneratorBug.java:18)

regards,
Rémi




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