On Wed, 13 May 2026 13:17:30 GMT, Yasumasa Suenaga <[email protected]> wrote:

>> On the review for [JDK-8380955](https://bugs.openjdk.org/browse/JDK-8380955) 
>> (#30443), `Linker` and `FunctionDescriptor` do not need to be value based 
>> class because they would not be treated as "value".
>> `Linker` is defined as providing a way to look up the canonical layouts 
>> associated with the data types used by the ABI. `FunctionDescriptor` 
>> represents the signature of a foreign function. They are not "value".
>> 
>> Actually they and their child (final) classes do not have `@ValueBased`, 
>> thus `javac` and `-XX:DiagnoseSyncOnValueBasedClasses` cannot identify if 
>> they are used in anti-pattern of value based class. Thus this change does 
>> not change behavior, just documentation updates.
>> 
>> ---------
>> - [x] I confirm that I make this contribution in accordance with the 
>> [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai).
>
> Yasumasa Suenaga has updated the pull request incrementally with two 
> additional commits since the last revision:
> 
>  - Add @ValueBased to FunctionDescriptorImpl
>  - Revert the change in FunctionDescriptor

src/java.base/share/classes/java/lang/foreign/FunctionDescriptor.java line 46:

> 44:  * @implSpec
> 45:  * Implementing classes are immutable, thread-safe and
> 46:  * <a 
> href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>.

Shouldn't this use the `@ValueBased` anno instead?

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PR Review Comment: https://git.openjdk.org/jdk/pull/30481#discussion_r3240299515

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