[lworld] RFR: 8281295: Prototype serialization/deserialization using Unsafe. [v3]

[Roger Riggs]

On Thu, 13 Oct 2022 14:07:24 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> src/java.base/share/classes/java/io/ObjectStreamClass.java line 2100:
>> 
>>> 2098:                 vals[offsets[i]] = switch (typeCodes[i]) {
>>> 2099:                     case 'L', '[' ->
>>> 2100:                             unsafe.isFlattened(f)
>> 
>> Flattened field has `Q` descriptor.  This PR doesn't support primitive class, right?
>
> As far as I know, a "value type" (aka primitive class) is a value class and the only difference from the Unsafe API point of view is whether it is flattened or not. There may be some additional work for JEP 401.

Also added a few tests for serializable primitive classes.

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PR: https://git.openjdk.org/valhalla/pull/761