Module openj9.dtfj

Package com.ibm.dtfj.java.j9

Class JavaHeap

java.lang.Object

com.ibm.dtfj.java.j9.JavaHeap

All Implemented Interfaces:

JavaHeap

public class JavaHeap
extends Object
implements JavaHeap

Constructor Summary

Constructors

Constructor	Description
JavaHeap(JavaRuntime vm, String name, ImagePointer id, ImagePointer start, long size, int arrayletIdOffset, int arrayletIdWidth, long arrayletIdMask, long arrayletIdResult, int fobjectSize, int fobjectPointerScale, long fobjectPointerDisplacement, int classOffset, int classSize, long classAlignment, boolean isSWH)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)	Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
long	getArrayletIdentificationBitmask()
int	getArrayletIdentificationOffset()
long	getArrayletIdentificationResult()
int	getArrayletIdentificationWidth()
long	getClassAlignment()
int	getFObjectSize()
String	getName()	Get a brief textual description of this heap.
Iterator	getObjects()	Get the set of objects which are stored in this heap.
Iterator	getSections()	Get the set of contiguous memory regions which form this heap.
int	hashCode()	Answers an integer hash code for the receiver.
boolean	isSWH()
ImagePointer	readClassPointerRelativeTo(ImagePointer pointer)
ImagePointer	readFObjectAt(ImagePointer basePointer, long offset)
JavaHeapRegion	regionForPointer(ImagePointer address)
void	setRegions(Vector regions)
long	tokenToPointer(long fobject)

Methods declared in class java.lang.Object

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

Constructor Details

JavaHeap

public JavaHeap(JavaRuntime vm,
 String name,
 ImagePointer id,
 ImagePointer start,
 long size,
 int arrayletIdOffset,
 int arrayletIdWidth,
 long arrayletIdMask,
 long arrayletIdResult,
 int fobjectSize,
 int fobjectPointerScale,
 long fobjectPointerDisplacement,
 int classOffset,
 int classSize,
 long classAlignment,
 boolean isSWH)

Method Details

getSections

public Iterator getSections()

Description copied from interface: JavaHeap

Get the set of contiguous memory regions which form this heap.

Specified by:

getSections in interface JavaHeap

Returns:

an iterator over the collection of contiguous memory regions which form this heap

See Also:

• ImageSection
• CorruptData

getName

public String getName()

Description copied from interface: JavaHeap

Get a brief textual description of this heap.

Specified by:

getName in interface JavaHeap

Returns:

a brief textual description of this heap

getObjects

public Iterator getObjects()

Description copied from interface: JavaHeap

Get the set of objects which are stored in this heap.

Specified by:

getObjects in interface JavaHeap

Returns:

an iterator over the collection of objects which are stored in this heap

See Also:

• JavaObject
• CorruptData

equals

public boolean equals(Object obj)

Description copied from class: java.lang.Object

Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison. The implementation in Object answers true only if the argument is the exact same object as the receiver (==).

Specified by:

equals in interface JavaHeap

Overrides:

equals in class Object

Parameters:

obj -

Returns:

True if the given object refers to the same Java Heap in the image

See Also:

• Object.hashCode()

hashCode

public int hashCode()

Description copied from class: java.lang.Object

Answers an integer hash code for the receiver. Any two objects which answer true when passed to .equals must answer the same value for this method.

Specified by:

hashCode in interface JavaHeap

Overrides:

hashCode in class Object

Returns:

the receiver's hash.

See Also:

• Object.equals(java.lang.Object)

regionForPointer

public JavaHeapRegion regionForPointer(ImagePointer address)

getArrayletIdentificationWidth

public int getArrayletIdentificationWidth()

getArrayletIdentificationOffset

public int getArrayletIdentificationOffset()

getArrayletIdentificationBitmask

public long getArrayletIdentificationBitmask()

getArrayletIdentificationResult

public long getArrayletIdentificationResult()

setRegions

public void setRegions(Vector regions)

getFObjectSize

public int getFObjectSize()

tokenToPointer

public long tokenToPointer(long fobject)

readClassPointerRelativeTo

public ImagePointer readClassPointerRelativeTo(ImagePointer pointer)
                                        throws MemoryAccessException,
CorruptDataException

Throws:

MemoryAccessException

CorruptDataException

readFObjectAt

public ImagePointer readFObjectAt(ImagePointer basePointer,
 long offset)
                           throws MemoryAccessException,
CorruptDataException

Throws:

MemoryAccessException

CorruptDataException

getClassAlignment

public long getClassAlignment()

isSWH

public boolean isSWH()