org.mmtk.vm.gcspy

Class ByteStream

java.lang.Object

org.mmtk.vm.gcspy.Stream

org.mmtk.vm.gcspy.ByteStream

Direct Known Subclasses:

ByteStream

public abstract class ByteStream
extends Stream

Set up a GCspy Stream with data type BYTE_TYPE

Field Summary

Fields

Modifier and Type	Field and Description
private byte[]	data Instance variables
private byte	defaultValue

Fields inherited from class org.mmtk.vm.gcspy.Stream

DEBUG, presentation, serverSpace, stream, streamId, summary0, summary1, summaryEnabled, summaryLen

Constructor Summary

Constructors

Constructor and Description
ByteStream(AbstractDriver driver, String name, byte minValue, byte maxValue, byte zeroValue, byte defaultValue, String stringPre, String stringPost, int presentation, int paintStyle, int indexMaxStream, Color colour, boolean summary) Construct a new GCspy stream of BYTE_TYPE

Method Summary

Modifier and Type	Method and Description
void	distribute(int start, byte remainder, int blockSize, byte value) Distribute a value across a sequence of tiles.
void	increment(int index, byte value) Increment the value of a tile.
void	resetData() Reset all data in this stream to default values.
void	send(int event, int numTiles) Send the data for this stream.

Methods inherited from class org.mmtk.vm.gcspy.Stream

getMaxValue, getMinValue, sendSummary, setStream, setSummary, setSummary

Methods inherited from class java.lang.Object

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

Field Detail

data

private final byte[] data

Instance variables

defaultValue

private final byte defaultValue

Constructor Detail

ByteStream

public ByteStream(AbstractDriver driver,
                  String name,
                  byte minValue,
                  byte maxValue,
                  byte zeroValue,
                  byte defaultValue,
                  String stringPre,
                  String stringPost,
                  int presentation,
                  int paintStyle,
                  int indexMaxStream,
                  Color colour,
                  boolean summary)

Construct a new GCspy stream of BYTE_TYPE

Parameters:

driver - The driver that owns this Stream

name - The name of the stream (e.g. "Used space")

minValue - The minimum value for any item in this stream. Values less than this will be represented as "minValue-"

maxValue - The maximum value for any item in this stream. Values greater than this will be represented as "maxValue+"

zeroValue - The zero value for this stream

defaultValue - The default value for this stream

stringPre - A string to prefix values (e.g. "Used: ")

stringPost - A string to suffix values (e.g. " bytes.")

presentation - How a stream value is to be presented.

paintStyle - How the value is to be painted.

indexMaxStream - The index of the maximum stream if the presentation is *_VAR.

colour - The default colour for tiles of this stream

summary - Is a summary enabled?

Method Detail

resetData

public void resetData()

Reset all data in this stream to default values.

distribute

public void distribute(int start,
                       byte remainder,
                       int blockSize,
                       byte value)

Distribute a value across a sequence of tiles. This handles the case when when an object spans two or more tiles and its value is to be attributed to each tile proportionally.

Parameters:

start - the index of the starting tile

remainder - the value left in the starting tile

blockSize - the size of each tile

value - the value to distribute

increment

public void increment(int index,
                      byte value)

Increment the value of a tile.

Parameters:

index - the index

value - the increment

send

public void send(int event,
                 int numTiles)

Description copied from class: Stream

Send the data for this stream.

Specified by:

send in class Stream

Parameters:

event - the event.

numTiles - the number of tiles to send (which may be less than maxTileNum)