On Thu, 24 Sep 2026 02:29:28 GMT, Serguei Spitsyn <[email protected]> wrote:

> This PR has fixes from @xmas92 for two bugs:
>  - https://bugs.openjdk.org/browse/JDK-8392964: JVMTI value-object tag 
> equality ignores inherited fields
>  - https://bugs.openjdk.org/browse/JDK-8386824: JVMTI equal_fields compares 
> value object floats mishandling NaNs
> 
> The fix accounts for inherited fields for JVMTI value-object tag equality.
> Also, it is using bit comparison for fields of `float` and `double` types.
> This updates provides an additional test coverage with new JVMTI test:
>  - 
> `test/hotspot/jtreg/serviceability/jvmti/valhalla/SetTag/ValueTagSubstitutabilityTest.java`
>  
>  Testing:
>   - Checked that new test `ValueTagSubstitutabilityTest.java` is failing 
> without this fix
>   - Checked that new test `ValueTagSubstitutabilityTest.java` is not failing 
> with the fix
>   - TBD: Run mach5 tiers 1-6
>   
> ---------
> - [x] I confirm that I make this contribution in accordance with the [OpenJDK 
> Interim AI Policy](https://openjdk.org/legal/ai).

lgtm.

test/hotspot/jtreg/serviceability/jvmti/valhalla/SetTag/ValueTagSubstitutabilityTest.java
 line 27:

> 25:  * @test
> 26:  * @summary Regression test for JVMTIs tag map value class instance 
> substitutability test
> 27:  * @bug 8386824 8389237

Suggestion:

 * @bug 8386824 8392964

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

Marked as reviewed by aboldtch (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/33046#pullrequestreview-5299979900
PR Review Comment: https://git.openjdk.org/jdk/pull/33046#discussion_r4090077700

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