Module openj9.dtfj

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

Class GCHeapLinkedFreeHeader

java.lang.Object

com.ibm.j9ddr.vm29.j9.gc.GCHeapLinkedFreeHeader

public abstract class GCHeapLinkedFreeHeader
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
protected com.ibm.j9ddr.vm29.pointer.generated.MM_HeapLinkedFreeHeaderPointer	heapLinkedFreeHeaderPointer

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	GCHeapLinkedFreeHeader(com.ibm.j9ddr.vm29.pointer.generated.MM_HeapLinkedFreeHeaderPointer heapLinkedFreeHeaderPointer)
protected	GCHeapLinkedFreeHeader(UDATA udata)

Method Summary

Modifier and Type	Method	Description
static GCHeapLinkedFreeHeader	fromJ9Object(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object)	Factory method to construct an appropriate heap linked free header
static GCHeapLinkedFreeHeader	fromLinkedFreeHeaderPointer(com.ibm.j9ddr.vm29.pointer.generated.MM_HeapLinkedFreeHeaderPointer heapLinkedFreeHeaderPointer)
com.ibm.j9ddr.vm29.pointer.generated.MM_HeapLinkedFreeHeaderPointer	getHeader()
abstract GCHeapLinkedFreeHeader	getNext()	Get the next HeapLinkedFreeHeader in the free list.
com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer	getObject()	Get the object represented by this free list entry.
abstract UDATA	getSize()	Get the size in bytes of this free entry.

Methods declared in class java.lang.Object

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

Field Details

heapLinkedFreeHeaderPointer

protected com.ibm.j9ddr.vm29.pointer.generated.MM_HeapLinkedFreeHeaderPointer heapLinkedFreeHeaderPointer

Constructor Details

GCHeapLinkedFreeHeader

protected GCHeapLinkedFreeHeader(UDATA udata)
                          throws CorruptDataException

Throws:

CorruptDataException

GCHeapLinkedFreeHeader

protected GCHeapLinkedFreeHeader(com.ibm.j9ddr.vm29.pointer.generated.MM_HeapLinkedFreeHeaderPointer heapLinkedFreeHeaderPointer)

Method Details

fromJ9Object

public static GCHeapLinkedFreeHeader fromJ9Object(com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer object)
                                           throws CorruptDataException

Factory method to construct an appropriate heap linked free header

Parameters:

object - the "J9Object" structure to view as a HeapLinkedFreeHeader

Returns:

an instance of GCHeapLinkedFreeHeader

Throws:

CorruptDataException

fromLinkedFreeHeaderPointer

public static GCHeapLinkedFreeHeader fromLinkedFreeHeaderPointer(com.ibm.j9ddr.vm29.pointer.generated.MM_HeapLinkedFreeHeaderPointer heapLinkedFreeHeaderPointer)

getSize

public abstract UDATA getSize()
                       throws CorruptDataException

Get the size in bytes of this free entry. The size is measured from the beginning of the header.

Returns:

size in bytes

Throws:

CorruptDataException

getNext

public abstract GCHeapLinkedFreeHeader getNext()
                                        throws CorruptDataException

Get the next HeapLinkedFreeHeader in the free list.

Returns:

size in bytes

Throws:

CorruptDataException

getObject

public com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer getObject()

Get the object represented by this free list entry.

Returns:

object the free list entry cast to a J9ObjectPointer

getHeader

public com.ibm.j9ddr.vm29.pointer.generated.MM_HeapLinkedFreeHeaderPointer getHeader()