RFR: 8299576: Reimplement java.io.Bits using VarHandle access [v2]

[Sergey Tsypanov]

On Tue, 17 Jan 2023 07:43:07 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>>> 
>>> Do you see any concrete examples of classes in the JDK that could benefit from a "VarHandlization"?
>> 
>>  `ImageOutputStreamImpl` and  `ImageInputStreamImpl`  in `javax.imageio.stream` have some very similar code that might benefit. Also `DataInputStream` and `DataOutpuStream`could possibly use `Bits` directly.
>
>> > Do you see any concrete examples of classes in the JDK that could benefit from a "VarHandlization"?
>> 
>> `ImageOutputStreamImpl` and `ImageInputStreamImpl` in `javax.imageio.stream` have some very similar code that might benefit. Also `DataInputStream` and `DataOutpuStream`could possibly use `Bits` directly.
> 
> Thanks @j3graham

@minborg I guess that the same can be done for `MethodHandles.readInt()`, `ByteBuffer.getInt()`, `AESCrypt.implEncryptBlock()`. Btw, I see that unlike original code `VarHandle.get()` returns Object, not primitive. Won't we have excessive allocation with this change?

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PR: https://git.openjdk.org/jdk/pull/11840