JDK-8331006 : [lworld] Support of null markers for nullable flat fields
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: repo-valhalla
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2024-04-23
  • Updated: 2024-05-03
  • Resolved: 2024-05-01
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Other
repo-valhallaFixed
Related Reports
Relates :  
JDK-8331673 - [lworld] JNI support for null marker
Relates :  
JDK-8331501 - [lworld] Unsafe support for null marker
Relates :  
JDK-8331500 - [lworld] Implement null markers support in C2
Relates :  
JDK-8331499 - [lworld] Implement null markers support in C1
Description
The first step to be able to flatten value fields within scope of JEP 401 is to have a null marker associated with such fields, to indicate if the current value of the value is the null reference or the flat representation embedded in the container.
Those null markers must be included in the object layout, and field accesses must be adjusted to either check or update those null markers.
Comments
A pull request was submitted for review. URL: https://git.openjdk.org/valhalla/pull/1078 Date: 2024-04-18 20:40:22 +0000
23-04-2024