RFR: 8202641: Replace OOP_SINCE_SAVE_MARKS with templates

Erik Österlund erik.osterlund at oracle.com
Fri May 4 13:18:07 UTC 2018

Hi Stefan,

Templates... oh yes.

gc/cms/promotionInfo.inline.hpp is seemingly missing some includes. It 
looks like it needs macros.hpp, oop.inline.hpp and debug.hpp.

Apart from that, this looks good, and I don't need another webrev.


On 2018-05-04 12:06, Stefan Karlsson wrote:
> Hi all,
> Please review this patch to replace the OOPS_SINCE_SAVE_MARKS macros 
> with templates.
> http://cr.openjdk.java.net/~stefank/8202641/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8202641
> The OOP_SINCE_SAVE_MARKS related macros are used to devirtualize 
> OopClosure calls. The way these works require us to stamp out all 
> relevant overloads of OopClosures in the Generation and 
> GenCollectedHeap classes. This makes it hard to separate Serial from 
> CMS. One example is defNewGeneration.hpp, which includes 
> cms/parOopClosure.hpp, just to make sure that CMS specific overloads 
> are generated for DefNewGeneration, even those that are never used.
> By replacing these macros with templates we can get rid of this false 
> dependency between DefNewGeneration and CMS.
> This patch builds upon the patch in:
> http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2018-May/021966.html 
> Thanks,
> StefanK

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