Class MMObjectAccessBarrier

java.lang.Object
com.ibm.j9ddr.vm29.j9.gc.GCBase
com.ibm.j9ddr.vm29.j9.gc.MMObjectAccessBarrier
public abstract class MMObjectAccessBarrier extends GCBase

  • Constructor Summary

    Constructors
    Modifier
    Constructor
    Description
    protected
    MMObjectAccessBarrier()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    abstract com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer
    convertPointerFromToken(long token)
    Converts token (e.g. compressed pointer value) into real heap pointer.
    abstract long
    convertTokenFromPointer(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer pointer)
    Converts real heap pointer into token (e.g. compressed pointer value).
    static MMObjectAccessBarrier
    from()
    Factory method to construct an appropriate object model.
    abstract com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer
    getFinalizeLink(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object)
    Fetch the finalize link field of object.
    abstract com.ibm.j9ddr.vm29.pointer.generated.J9ObjectMonitorPointer
    getLockword(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object)
    Return the lockword for the given object, or NULL if it does not have a lockword.
    abstract ObjectMonitor
    getMonitor(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object)
    Return an object representing the monitor for the given object, or NULL if it does not have a lockword/monitor.
    abstract I32
    getObjectHashCode(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object)
    Determine the basic hash code for the specified object.
    abstract com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer
    getOwnableSynchronizerLink(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object)
    Fetch the ownableSynchronizer link field of object.
    abstract com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer
    getReferenceLink(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object)
    Fetch the reference link field of the specified reference object.
    abstract com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer
    isObjectInOwnableSynchronizerList(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object)
    check if the object in one of OwnableSynchronizerLists

    Methods declared in class GCBase

    getExtensions, getJavaVM

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • MMObjectAccessBarrier

      protected MMObjectAccessBarrier()

  • Method Details

    • from

      public static MMObjectAccessBarrier from() throws CorruptDataException
      Factory method to construct an appropriate object model.
      Parameters:
      structure - the J9JavaVM structure to use
      Returns:
      an instance of ObjectModel
      Throws:
      CorruptDataException

    • getObjectHashCode

      public abstract I32 getObjectHashCode(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object) throws CorruptDataException
      Determine the basic hash code for the specified object.
      Parameters:
      object - [in] the object to be hashed
      Returns:
      the persistent, basic hash code for the object
      Throws:
      CorruptDataException

    • getFinalizeLink

      public abstract com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer getFinalizeLink(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object) throws CorruptDataException
      Fetch the finalize link field of object.
      Parameters:
      object - [in] the object to read
      Returns:
      the value stored in the object's finalizeLink field
      Throws:
      CorruptDataException

    • getOwnableSynchronizerLink

      public abstract com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer getOwnableSynchronizerLink(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object) throws CorruptDataException
      Fetch the ownableSynchronizer link field of object.
      Parameters:
      object - [in] the object to read
      Returns:
      the value stored in the object's ownableSynchronizerLink field
      Throws:
      CorruptDataException

    • isObjectInOwnableSynchronizerList

      public abstract com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer isObjectInOwnableSynchronizerList(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object) throws CorruptDataException
      check if the object in one of OwnableSynchronizerLists
      Parameters:
      object - [in] the object pointer
      Returns:
      the value stored in the object's reference link field if reference link field == J9ObjectPointer.NULL, it means the object isn't in the list
      Throws:
      CorruptDataException

    • getReferenceLink

      public abstract com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer getReferenceLink(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object) throws CorruptDataException
      Fetch the reference link field of the specified reference object.
      Parameters:
      object - the object to read
      Returns:
      the value stored in the object's reference link field
      Throws:
      CorruptDataException

    • getLockword

      public abstract com.ibm.j9ddr.vm29.pointer.generated.J9ObjectMonitorPointer getLockword(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object) throws CorruptDataException
      Return the lockword for the given object, or NULL if it does not have a lockword. This may return NULL, a flatlock, or an inflated monitor.
      Throws:
      CorruptDataException

    • getMonitor

      public abstract ObjectMonitor getMonitor(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object) throws CorruptDataException
      Return an object representing the monitor for the given object, or NULL if it does not have a lockword/monitor.
      Throws:
      CorruptDataException

    • convertPointerFromToken

      public abstract com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer convertPointerFromToken(long token)
      Converts token (e.g. compressed pointer value) into real heap pointer.
      Returns:
      the heap pointer value.

    • convertTokenFromPointer

      public abstract long convertTokenFromPointer(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer pointer)
      Converts real heap pointer into token (e.g. compressed pointer value).
      Returns:
      the compressed pointer value.