Lookup.findStatic() triggers verification of nestmates attribute too early ?

Harold Seigel harold.seigel at oracle.com
Wed Apr 15 13:34:43 UTC 2020


Hi Remi,

An ASM example would be fine.

This is a hotspot issue, not core-dev.

Thanks, Harold

On 4/15/2020 9:27 AM, Remi Forax wrote:
> ----- Mail original -----
>> De: "Harold David Seigel" <harold.seigel at oracle.com>
>> À: "valhalla-dev" <valhalla-dev at openjdk.java.net>
>> Envoyé: Mercredi 15 Avril 2020 15:12:30
>> Objet: Re: Lookup.findStatic() triggers verification of nestmates attribute too early ?
>> Hi Remi,
>>
>> Can you provide us with your failing test?
> I will create a reproducer, but it involves generating bytecodes using ASM,
> i can generate the faulty class and base64 encode it as a String ?
>
>> Also, did the failure occur with inline types or on a different repo?
> It's more for the nestmate branch, but it's a jdk15 issue,
> may be i should have reported that issue on core-dev ?
>
>> Thanks, Harold
> Rémi
>
>> On 4/15/2020 8:41 AM, Remi Forax wrote:
>>> Hi all,
>>> i've discovered that using Lookup.findStatic() triggers the verification that
>>> the attributes NestHost and the NestMembers are compatible.
>>>
>>> I believe it's a bug, the equivalent code using bytecodes will no trigger this
>>> early verification, the verification is done lazily when a private member of a
>>> class of the nest is accessed the first time.
>>>
>>> java.lang.IncompatibleClassChangeError: Type
>>> jdk.incubator.vector.Cell$VectorizedBackend$Template/0x0000000800457840
>>> (loader: 'bootstrap') is not a nest member of jdk.incubator.vector.IntVector
>>> (loader: 'bootstrap'): current type is not listed as a nest member
>>>          java.base/java.lang.invoke.MethodHandleNatives.resolve(Native Method)
>>>          java.base/java.lang.invoke.MemberName$Factory.resolve(MemberName.java:1084)
>>>          java.base/java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:1111)
>>>          [...]
>>>
>>> regards,
>>> Rémi


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