RFR 8023463 Update HashMap and LinkedHashMap to use bins/buckets or trees (red/black)

Paul Sandoz paul.sandoz at oracle.com
Sun Aug 25 09:43:47 UTC 2013

On Aug 24, 2013, at 1:35 AM, Brent Christian <brent.christian at oracle.com> wrote:

> On 8/22/13 5:01 AM, Paul Sandoz wrote:
>> On Aug 21, 2013, at 6:47 PM, Paul Sandoz <Paul.Sandoz at oracle.com> wrote:
>>> I updated the webrev and replaced TreeBinSplitBackToEntries.java with:
>>>  http://cr.openjdk.java.net/~psandoz/tl/JDK-8023463-Linked-HashMap-bin-and-tree/webrev/test/java/util/Map/MapBinToFromTreeTest.java.html
> >
> > Another tweak to ensure untreeify is tested on resize (use the same
> > URL above). I think at this point the tests are in reasonable shape
> > and are on a par with previous tests.
> The new MapBinToFromTreeTest code looks good.  I confirmed that it hits the 4 main cases in split() (tree/untreeify for loHead/hiHead).


> (FWIW, I don't believe the entire split() tree ever lands all in one bin (loHead and hiHead are never null), though it's possible that it could.)

I did not cover those cases, but it should be easy to do so. IIUC either can be null but not both, if e.hash & bit == 0 or not for all in e in the tree.

> I agree that we should check back on the code coverage results and update the tests as needed.
> I've focused on looking at portions of HashMap that I recall being tricky (split, treeify, etc).  So far it all looks fine to me.

OK, thanks,

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