JDK-8225801 : Shenandoah: Adjust SA to reflect recent forwarding pointer changes
  • Type: Bug
  • Component: hotspot
  • Sub-Component: svc-agent
  • Affected Version: 12,13
  • Priority: P2
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2019-06-14
  • Updated: 2020-06-01
  • Resolved: 2019-06-14
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JDK 13 JDK 14
13Fixed 14 b02Fixed
Related Reports
Relates :  
JDK-8224584 - Shenandoah: Eliminate forwarding pointer word
Description
Shenandoah eliminated extra header for forwarding pointers and folded into mark word.

SA needs to make corresponding adjustments.
Comments
This patch needs to be backport JDK13, cause Shenandoah SA is completely broken with it. I higher 'ed priority to P2 sun.jvm.hotspot.types.WrongTypeException: No suitable match for type of address 0x0000000800000008 at jdk.hotspot.agent/sun.jvm.hotspot.runtime.InstanceConstructor.newWrongTypeException(InstanceConstructor.java:62) at jdk.hotspot.agent/sun.jvm.hotspot.runtime.VirtualBaseConstructor.instantiateWrapperFor(VirtualBaseConstructor.java:109) at jdk.hotspot.agent/sun.jvm.hotspot.oops.Metadata.instantiateWrapperFor(Metadata.java:74) at jdk.hotspot.agent/sun.jvm.hotspot.oops.Oop.getKlassForOopHandle(Oop.java:210) at jdk.hotspot.agent/sun.jvm.hotspot.oops.ObjectHeap.newOop(ObjectHeap.java:182) at jdk.hotspot.agent/sun.jvm.hotspot.oops.ObjectHeap.iterateLiveRegions(ObjectHeap.java:263) at jdk.hotspot.agent/sun.jvm.hotspot.oops.ObjectHeap.iterate(ObjectHeap.java:102) at jdk.hotspot.agent/sun.jvm.hotspot.HSDB$VisitHeap.run(HSDB.java:1746) at jdk.hotspot.agent/sun.jvm.hotspot.utilities.WorkerThread$MainLoop.run(WorkerThread.java:70) at java.base/java.lang.Thread.run(Thread.java:830)
17-06-2019