RFR: 8286669: Replace MethodHandle specialization with ASM in mainline [v3]

[Rémi Forax]

On Mon, 16 May 2022 17:40:41 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> Hi,
>> 
>> This PR brings over commits from the panama-foreign repo. These commits mostly pertain to the switch to ASM and away from MethodHandle combinators for the binding recipe specialization. But, there is one more commit which adds freeing of downcall stubs, since those changes were mostly Java as well.
>> 
>> Thanks,
>> Jorn
>> 
>> Testing: `run-test-jdk_foreign` with `-Dgenerator.sample.factor=-1` on Windows and Linux.
>
> Jorn Vernee has updated the pull request incrementally with one additional commit since the last revision:
> 
>   BootstrapMethodError -> ExceptionInInitializerError

src/java.base/share/classes/jdk/internal/foreign/abi/BindingSpecializer.java line 967:

> 965: 
> 966:     // unaligned constants
> 967:     public final static ValueLayout.OfBoolean JAVA_BOOLEAN_UNALIGNED = JAVA_BOOLEAN;

as far as i understand, those constants are accessed from the bytecode, they should be in their own class to cleanly separate the specializer part and the runtime part.

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PR: https://git.openjdk.java.net/jdk/pull/8685