RFR: 8132984: incorrect type for Reference.discovered [v3]
plevart at openjdk.java.net
Tue Jan 19 11:17:51 UTC 2021
On Mon, 18 Jan 2021 23:42:08 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:
>> Please review this change which fixes the type of the private
>> Reference.discovered field. It was Reference<T>, but that's wrong because
>> it can be any Reference object.
>> I've changed it to Reference<?> and let that flow through, updating some
>> other variables that were previously somewhat incorrectly typed (usually
>> with an Object type parameter). The interesting change is to the
>> ReferenceQueue.enqueue parameter, which is now also Reference<?>.
>> This ultimately end up with a provably safe and correct, but uncheckable,
>> cast in ReferenceQueue.enqueue.
>> An alternative might be to use a raw type for the discovered field, but I
>> think that ends up with more @SuppressWarnings of various flavors. I think
>> the unbounded wildcard approach is clearer and cleaner.
>> Note that all of the pending list handling, including the discovered field,
>> could be moved into a non-public, non-generic, sealed(?) base class of
>> Reference<T>. The pending list handling has nothing to do with the generic
>> parameter T.
>> mach5 tier1 and tier4 (tier4 is where vmTestbase_vm_gc_ref tests are run)
> Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:
> plevart improvement
This looks good.
Marked as reviewed by plevart (Reviewer).
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