JDK-8231086 : Shenandoah: Stronger invariant for object-arraycopy
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 8-shenandoah,11-shenandoah,14
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2019-09-16
  • Updated: 2021-01-20
  • Resolved: 2019-09-18
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JDK 14
14 b15Fixed
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JDK-8237012 :  
Currently, arraycopy operations can cause temporary from-space-references in the destination array. Those would be subsequently updated by an arraycopy-post-barrier, but it's awkward because this temporary from-space references need to be dealt with, e.g. in the CAS-obj barrier, and a few other places.
We can update the src array before copying, and therefore ensure to never see a from-space-reference in the dst array, ever. This opens up a couple of opportunities for simplification and optimization.
URL: https://hg.openjdk.java.net/jdk/jdk/rev/0d7877278adf User: rkennke Date: 2019-09-18 19:00:54 +0000