Compiler bugs

[Cay Horstmann]

Hi, I built the Valhalla image from https://github.com/openjdk/valhalla and get errors with very basic programs:

import java.lang.management.*;

value record Point(int x, int y) {}

public class Problem1 {
    public static void main(String[] args) {
       int NPOINTS = 100_000;
       System.out.println(new Point(3, 4));
    }
}

$ javac Problem1.java
$ java Problem1
Exception in thread "main" java.lang.IncompatibleClassChangeError: Value type Point has an identity type as supertype

value class Point {
    int x;
    int y;
    Point(int x, int y) { this.x = x; this.y = y; }
}

public class Problem2 {
    public static void main(String[] args) {
       int NPOINTS = 100_000;
       Point[] ps = new Point[NPOINTS];
       for (int i = 0; i < ps.length; i++) {
          ps[i] = new Point(i, i);
       }
    }
}

#  SIGSEGV (0xb) at pc=0x00007f27b82c9570, pid=111935, tid=111936
#
# JRE version: OpenJDK Runtime Environment (22.0) (build 22-internal-adhoc.cay.valhalla)
# Java VM: OpenJDK 64-Bit Server VM (22-internal-adhoc.cay.valhalla, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# J 6 c2 Point.<init>(II)V (15 bytes) @ 0x00007f27b82c9570 [0x00007f27b82c94a0+0x00000000000000d0]
#

Are you interested in getting such reports, or is the implementation known to be unstable right now?

Cheers,

Cay


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Cay S. Horstmann | http://horstmann.com | mailto:cay at horstmann.com