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

[Serguei Spitsyn]

On Thu, 18 Dec 2025 20:00:45 GMT, Alex Menkov <amenkov at openjdk.org> wrote:

> Updated implementation of ObjectReference.equals and ObjectReference.hashCode to comply the spec for value objects.
> Added the test for value object ctor debugging, the test verifies the behaviour is expected.
> There is an issue with instance filter, it till be fixed separately (it's not yet clear how it would be better to fix it)
> 
> testing: tier1..4, hs-tier5-svc

src/jdk.jdwp.agent/share/native/libjdwp/ObjectReferenceImpl.c line 430:

> 428:     {isSameObjectImpl, "IsSameObject"},
> 429:     {objectHashCodeImpl, "ObjectHashCode"}
> 430: };

I'd suggest to keep current naming convention (just first letter is changed to capital):
   referenceType        <=> ReferenceType
   disableCollection   <=> DisableCollection
   referringObjects    <=> ReferringObjects
   isSameObjectIs     <=> SameObject
   objectHashCode   <=> ObjectHashCode
Then the existing objectHashCode needs to be renamed to something else.

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1834#discussion_r2632756590