org.mmtk.policy

Class MarkCompactCollector.ToCursor

java.lang.Object

org.mmtk.policy.MarkCompactCollector.RegionCursor

org.mmtk.policy.MarkCompactCollector.ToCursor

Enclosing class:

MarkCompactCollector

private static final class MarkCompactCollector.ToCursor
extends MarkCompactCollector.RegionCursor

Subclass for the read-only cursor that follows the 'from' cursor, writing or calculating the position of copied objects

Field Summary

Fields inherited from class org.mmtk.policy.MarkCompactCollector.RegionCursor

cursor, limit, region

Constructor Summary

Constructors

Constructor and Description
ToCursor()

Method Summary

Modifier and Type	Method and Description
(package private) void	advanceToNextRegion() Move to the next region, in read-only mode.
(package private) void	copy(ObjectReference from, ObjectReference to) Copy an object to an address within this cursor's region.
(package private) void	finish() Update the metadata of the current region with the current value of the cursor.
(package private) void	finishAndAdvanceToNextRegion() Move to the next region, updating the metadata with the current 'write' state.
(package private) void	init(Address region) Initialize the cursor to a given region.
(package private) Address	snip() Terminate the list of regions here.

Methods inherited from class org.mmtk.policy.MarkCompactCollector.RegionCursor

assertCursorInBounds, get, getLimit, getRegion, inc, incTo, isAvailable, isInRegion, isValid, print, sameRegion

Methods inherited from class java.lang.Object

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

Constructor Detail

ToCursor

ToCursor()

Method Detail

init

void init(Address region)

Initialize the cursor to a given region. The limit is the limit of available space in the region.

Specified by:

init in class MarkCompactCollector.RegionCursor

Parameters:

region - The region to be processed.

finish

void finish()

Update the metadata of the current region with the current value of the cursor. Zero the region from here to the end.

snip

Address snip()

Terminate the list of regions here.

Returns:

The address of the (old) next region in the list.

copy

void copy(ObjectReference from,
          ObjectReference to)

Copy an object to an address within this cursor's region.

Parameters:

from - The source object

to - The target object

finishAndAdvanceToNextRegion

void finishAndAdvanceToNextRegion()

Move to the next region, updating the metadata with the current 'write' state.

advanceToNextRegion

void advanceToNextRegion()

Move to the next region, in read-only mode. Add the assertion of validity, since we shouldn't be able to fall off the end of the list while writing.

Overrides:

advanceToNextRegion in class MarkCompactCollector.RegionCursor