com.oracle.svm.core.genscavenge

Class OldGeneration

java.lang.Object

com.oracle.svm.core.genscavenge.OldGeneration

public final class OldGeneration
extends Object

An OldGeneration has two Spaces, OldGeneration.fromSpace for existing objects, and OldGeneration.toSpace for newly-allocated or promoted objects.

Method Summary

Modifier and Type	Method and Description
String	getName()
Object	promoteAlignedObject(Object original, AlignedHeapChunk.AlignedHeader originalChunk, Space originalSpace) Promote an Object to ToSpace if it is not already in ToSpace.
protected boolean	promoteChunk(HeapChunk.Header<?> originalChunk, boolean isAligned, Space originalSpace) Promote a HeapChunk from its original space to the appropriate space in this generation if there is sufficient capacity.
protected Object	promoteUnalignedObject(Object original, UnalignedHeapChunk.UnalignedHeader originalChunk, Space originalSpace) Promote an Object to this Generation, typically by HeapChunk motion.
Log	report(Log log, boolean traceHeapChunks) Report some statistics about the Generation to a Log.
boolean	walkObjects(ObjectVisitor visitor) Walk the Objects in this Space, passing each to a Visitor.

Methods inherited from class java.lang.Object

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

Method Detail

walkObjects

public boolean walkObjects(ObjectVisitor visitor)

Walk the Objects in this Space, passing each to a Visitor.

Parameters:

visitor - An ObjectVisitor.

Returns:

True if all visits returned true, false otherwise.

promoteAlignedObject

public Object promoteAlignedObject(Object original,
                                   AlignedHeapChunk.AlignedHeader originalChunk,
                                   Space originalSpace)

Promote an Object to ToSpace if it is not already in ToSpace.

Returns:

a reference to the promoted object, which is different to the original reference if promotion was done by copying, or null if there was insufficient capacity in this generation.

promoteUnalignedObject

protected Object promoteUnalignedObject(Object original,
                                        UnalignedHeapChunk.UnalignedHeader originalChunk,
                                        Space originalSpace)

Promote an Object to this Generation, typically by HeapChunk motion. If the object cannot be promoted due to insufficient capacity, returns null. This turns an Object from white to grey: the object is in this Generation, but has not yet had its interior pointers visited.

Returns:

a reference to the promoted object, which is the same as the original if the object was promoted through HeapChunk motion, or null if there was insufficient capacity in this generation.

promoteChunk

protected boolean promoteChunk(HeapChunk.Header<?> originalChunk,
                               boolean isAligned,
                               Space originalSpace)

Promote a HeapChunk from its original space to the appropriate space in this generation if there is sufficient capacity. This turns all the Objects in the chunk from white to grey: the objects are in the target Space, but have not yet had their interior pointers visited.

Returns:

true on success, false if the there was insufficient capacity.

report

public Log report(Log log,
                  boolean traceHeapChunks)

Report some statistics about the Generation to a Log.

getName

public String getName()