Module openj9.dtfj

Package com.ibm.j9ddr.vm29.j9.gc

Class GCHeapRegionManager

java.lang.Object

com.ibm.j9ddr.vm29.j9.gc.GCHeapRegionManager

public class GCHeapRegionManager
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
protected int	_auxRegionCount	< address ordered doubly linked list for auxiliary heap regions
protected com.ibm.j9ddr.vm29.pointer.generated.MM_HeapRegionManagerPointer	_heapRegionManager
protected VoidPointer	_highTableEdge	< the first (lowest address) byte of heap which is addressable by the table
protected VoidPointer	_lowTableEdge	< number of heap regions on the fixed-sized table (_regionTable)
protected UDATA	_regionShift	< the size, in bytes, of a region in the _regionTable
protected UDATA	_regionSize	< number of heap regions on the auxiliary list
protected GCHeapRegionDescriptor[]	_regionTable	< the shift value to use against pointers to determine the corresponding region index
protected UDATA	_tableDescriptorSize	< the first byte AFTER the heap range which is addressable by the table
protected int	_tableRegionCount	< the raw array of fixed-sized regions for representing a flat heap
protected UDATA	_totalHeapSize	< The size, in bytes, of the HeapRegionDescriptor subclass used by this manager
protected static GCHeapRegionManager	singleton

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	GCHeapRegionManager(com.ibm.j9ddr.vm29.pointer.generated.MM_HeapRegionManagerPointer hrm)	< The size, in bytes, of all currently active regions on the heap (that is, both table descriptors attached to subspaces and aux descriptors in the list)

Method Summary

Modifier and Type	Method	Description
GCHeapRegionDescriptor	auxiliaryDescriptorForAddress(AbstractPointer heapAddress)
static GCHeapRegionManager	fromHeapRegionManager(com.ibm.j9ddr.vm29.pointer.generated.MM_HeapRegionManagerPointer hrm)
Iterator<GCHeapRegionDescriptor>	getAuxiliaryRegions()
UDATA	getHeapSize()
UDATA	getRegionSize()
int	getTableRegionCount()
Iterator<GCHeapRegionDescriptor>	getTableRegions()
UDATA	getTotalHeapSize()
protected void	initializeAuxRegionDescriptors()
protected void	initializeTableRegionDescriptors()
GCHeapRegionDescriptor	physicalTableDescriptorForIndex(int regionIndex)
protected int	physicalTableDescriptorIndexForAddress(AbstractPointer heapAddress)
GCHeapRegionDescriptor	regionDescriptorForAddress(AbstractPointer heapAddress)
GCHeapRegionDescriptor	tableDescriptorForAddress(AbstractPointer heapAddress)
GCHeapRegionDescriptor	tableDescriptorForIndex(int regionIndex)

Methods declared in class java.lang.Object

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

Field Details

singleton

protected static GCHeapRegionManager singleton

_heapRegionManager

protected com.ibm.j9ddr.vm29.pointer.generated.MM_HeapRegionManagerPointer _heapRegionManager

_auxRegionCount

protected int _auxRegionCount

< address ordered doubly linked list for auxiliary heap regions

_regionSize

protected UDATA _regionSize

< number of heap regions on the auxiliary list

_regionShift

protected UDATA _regionShift

< the size, in bytes, of a region in the _regionTable

_regionTable

protected GCHeapRegionDescriptor[] _regionTable

< the shift value to use against pointers to determine the corresponding region index

_tableRegionCount

protected int _tableRegionCount

< the raw array of fixed-sized regions for representing a flat heap

_lowTableEdge

protected VoidPointer _lowTableEdge

< number of heap regions on the fixed-sized table (_regionTable)

_highTableEdge

protected VoidPointer _highTableEdge

< the first (lowest address) byte of heap which is addressable by the table

_tableDescriptorSize

protected UDATA _tableDescriptorSize

< the first byte AFTER the heap range which is addressable by the table

_totalHeapSize

protected UDATA _totalHeapSize

< The size, in bytes, of the HeapRegionDescriptor subclass used by this manager

Constructor Details

GCHeapRegionManager

protected GCHeapRegionManager(com.ibm.j9ddr.vm29.pointer.generated.MM_HeapRegionManagerPointer hrm)
                       throws CorruptDataException

< The size, in bytes, of all currently active regions on the heap (that is, both table descriptors attached to subspaces and aux descriptors in the list)

Throws:

CorruptDataException

Method Details

fromHeapRegionManager

public static GCHeapRegionManager fromHeapRegionManager(com.ibm.j9ddr.vm29.pointer.generated.MM_HeapRegionManagerPointer hrm)
                                                 throws CorruptDataException

Throws:

CorruptDataException

initializeAuxRegionDescriptors

protected void initializeAuxRegionDescriptors()
                                       throws CorruptDataException

Throws:

CorruptDataException

initializeTableRegionDescriptors

protected void initializeTableRegionDescriptors()
                                         throws CorruptDataException

Throws:

CorruptDataException

getTotalHeapSize

public UDATA getTotalHeapSize()

getRegionSize

public UDATA getRegionSize()

getTableRegionCount

public int getTableRegionCount()

getHeapSize

public UDATA getHeapSize()

getAuxiliaryRegions

public Iterator<GCHeapRegionDescriptor> getAuxiliaryRegions()
                                                     throws CorruptDataException

Throws:

CorruptDataException

getTableRegions

public Iterator<GCHeapRegionDescriptor> getTableRegions()
                                                 throws CorruptDataException

Throws:

CorruptDataException

regionDescriptorForAddress

public GCHeapRegionDescriptor regionDescriptorForAddress(AbstractPointer heapAddress)

auxiliaryDescriptorForAddress

public GCHeapRegionDescriptor auxiliaryDescriptorForAddress(AbstractPointer heapAddress)

tableDescriptorForIndex

public GCHeapRegionDescriptor tableDescriptorForIndex(int regionIndex)

physicalTableDescriptorForIndex

public GCHeapRegionDescriptor physicalTableDescriptorForIndex(int regionIndex)

physicalTableDescriptorIndexForAddress

protected int physicalTableDescriptorIndexForAddress(AbstractPointer heapAddress)

tableDescriptorForAddress

public GCHeapRegionDescriptor tableDescriptorForAddress(AbstractPointer heapAddress)