[lworld] RFR: 8373202: [lworld] ObjectReference.equals should follow == semantics for value objects [v2]

[Alex Menkov]

On Tue, 20 Jan 2026 19:31:21 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> We should execute jdwp command only when it's available (vm.canUseIsSameObject returns true) and the object is value object.
>> Note that isValueObject() may not work for old releases, so we need to check both conditions here or move version check to ClassTypeImpl.isValueClass
>
> If the JVM supports value objects, the debug agent has to support IsSameObject and ObjectHashCode. I don't see how we can have a functional JDWP and JDI otherwise. The logic above is proving that. It allows for the impossible to support situation where isValueObject() can return true, yet IsSameObject is not supported, meaning we can't properly compute the hash code.
> 
> If IsValueObject returns true, the invariant should be that IsSameObject is supported.

ok. updated this way

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1834#discussion_r2718754861