com.oracle.svm.core.genscavenge

Class AbstractImageHeapLayouter<T extends AbstractImageHeapLayouter.AbstractImageHeapPartition>

java.lang.Object

com.oracle.svm.core.genscavenge.AbstractImageHeapLayouter<T>

All Implemented Interfaces:

ImageHeapLayouter

Direct Known Subclasses:

ChunkedImageHeapLayouter, LinearImageHeapLayouter

public abstract class AbstractImageHeapLayouter<T extends AbstractImageHeapLayouter.AbstractImageHeapPartition>
extends Object
implements ImageHeapLayouter

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AbstractImageHeapLayouter.AbstractImageHeapPartition The native image heap comes in partitions.

Constructor Summary

Constructors

Constructor and Description
AbstractImageHeapLayouter()

Method Summary

Modifier and Type	Method and Description
void	assignObjectToPartition(ImageHeapObject info, boolean immutable, boolean references, boolean relocatable) Assign an object to the most suitable partition.
protected ImageHeapLayoutInfo	createLayoutInfo(long heapStartOffset, long writableBeginOffset)
protected abstract T	createPartition(String name, boolean containsReferences, boolean writable, boolean hugeObjects)
protected abstract T[]	createPartitionsArray(int count)
protected abstract ImageHeapLayoutInfo	doLayout(ImageHeap imageHeap)
protected long	getHugeObjectThreshold() The size in bytes at and above which an object should be assigned to the huge partitions.
T[]	getPartitions() Returns all native image heap partitions.
protected T	getReadOnlyHuge()
protected T	getReadOnlyPrimitive()
protected T	getReadOnlyReference()
protected T	getReadOnlyRelocatable()
protected T	getWritableHuge()
protected T	getWritablePrimitive()
protected T	getWritableReference()
ImageHeapLayoutInfo	layout(ImageHeap imageHeap, int pageSize) This method places all heap partitions as one contiguous memory block in one section.
void	writeMetadata(ByteBuffer imageHeapBytes, long imageHeapOffsetInBuffer) Based on the layout decided during an earlier call to ImageHeapLayouter.layout(com.oracle.svm.core.image.ImageHeap, int), fill the image heap in the supplied buffer with additional data structures, if any.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractImageHeapLayouter

public AbstractImageHeapLayouter()

Method Detail

getPartitions

public T[] getPartitions()

Description copied from interface: ImageHeapLayouter

Returns all native image heap partitions.

Specified by:

getPartitions in interface ImageHeapLayouter

assignObjectToPartition

public void assignObjectToPartition(ImageHeapObject info,
                                    boolean immutable,
                                    boolean references,
                                    boolean relocatable)

Description copied from interface: ImageHeapLayouter

Assign an object to the most suitable partition.

Specified by:

assignObjectToPartition in interface ImageHeapLayouter

layout

public ImageHeapLayoutInfo layout(ImageHeap imageHeap,
                                  int pageSize)

Description copied from interface: ImageHeapLayouter

This method places all heap partitions as one contiguous memory block in one section. After calling that method, all native image heap objects are assigned their final address. This address must not change anymore.

Specified by:

layout in interface ImageHeapLayouter

writeMetadata

public void writeMetadata(ByteBuffer imageHeapBytes,
                          long imageHeapOffsetInBuffer)

Description copied from interface: ImageHeapLayouter

Based on the layout decided during an earlier call to ImageHeapLayouter.layout(com.oracle.svm.core.image.ImageHeap, int), fill the image heap in the supplied buffer with additional data structures, if any. At this time, the buffer already contains the laid out objects, which are not meant to be modified in this step.

Specified by:

writeMetadata in interface ImageHeapLayouter

imageHeapOffsetInBuffer - The offset of the first byte of the laid out image heap in the buffer. If a layouter subclass can be instructed to start laying out the image heap at a specific non-zero offset, and the image heap is intended to start at the same offset in the given buffer, the same offset must be specified to this method.

doLayout

protected abstract ImageHeapLayoutInfo doLayout(ImageHeap imageHeap)

getReadOnlyPrimitive

protected T getReadOnlyPrimitive()

getReadOnlyReference

protected T getReadOnlyReference()

getReadOnlyRelocatable

protected T getReadOnlyRelocatable()

getWritablePrimitive

protected T getWritablePrimitive()

getWritableReference

protected T getWritableReference()

getWritableHuge

protected T getWritableHuge()

getReadOnlyHuge

protected T getReadOnlyHuge()

getHugeObjectThreshold

protected long getHugeObjectThreshold()

The size in bytes at and above which an object should be assigned to the huge partitions.

createLayoutInfo

protected ImageHeapLayoutInfo createLayoutInfo(long heapStartOffset,
                                               long writableBeginOffset)

createPartitionsArray

protected abstract T[] createPartitionsArray(int count)

createPartition

protected abstract T createPartition(String name,
                                     boolean containsReferences,
                                     boolean writable,
                                     boolean hugeObjects)