RFR: 8352075: Perf regression accessing fields [v4]

[Hannes Greule]

On Mon, 5 May 2025 12:51:47 GMT, Radim Vansa <rvansa at openjdk.org> wrote:

> For the record, in the ideal case I would like to backport this into JDK 21 as well. Do you think that the change in iteration order would be problematic for that?

I think that also affects iteration order of Java methods like `Class#getDeclaredFields()` etc.? While the order is unspecified there, I'm pretty certain that it would break existing code. But even worse, [JVM TI specifies that `GetClassFields` returns fields in the order they occur in the class file](https://docs.oracle.com/en/java/javase/21/docs/specs/jvmti.html#GetClassFields). I assume this is currently broken?

-------------

PR Comment: https://git.openjdk.org/jdk/pull/24847#issuecomment-2851062633