RFR: 8350118: Simplify the layout access VarHandle [v2]

[Chen Liang]

On Fri, 21 Feb 2025 10:15:12 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Review remarks, dates, some more simplifications
>
> src/java.base/share/classes/java/lang/invoke/X-VarHandleSegmentView.java.template line 85:
> 
>> 83: 
>> 84:         @ForceInline
>> 85:         static $type$ get(VarHandle ob, Object obb, long base) {
> 
> I like this: a fast path for non-strided access, while, at the same time, reusing the impl.
> In the future we can also add another variant for when there's only one index (which is by far the most common case).

I think that would require new impl classes, as there may be invocation type clash with the existing one-offset version. And the new offset will require extra checks too.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23720#discussion_r1968135651