RFR: 8265079: Implement VarHandle invoker caching

[Vladimir Ivanov]

On Mon, 12 Apr 2021 16:24:37 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> This patch implements 2 leftover TODOs for implementing var handle invoker MH caching (lambda forms for those were already shared/cached).
> 
> This piggybacks on the existing mechanism for method handle invoker caching.
> 
> Testing: Local testing `java/lang/invoke` tests. Tier 1-3
> 
> Thanks,
> Jorn

Looks good.

src/java.base/share/classes/java/lang/invoke/Invokers.java line 131:

> 129:     }
> 130: 
> 131:     private MethodHandle cachedVHInvoker(int idx, VarHandle.AccessMode ak) {

You can turn `int idx` parameter into `boolean isExact` and choose base index depending on its value.

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

Marked as reviewed by vlivanov (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/3439