com.oracle.svm.core.genscavenge.remset

Class NoRememberedSet

java.lang.Object

com.oracle.svm.core.genscavenge.remset.NoRememberedSet

All Implemented Interfaces:

RememberedSet

public final class NoRememberedSet
extends Object
implements RememberedSet

This implementation is only used if remembered sets are disabled, so most operations are no-ops. Without a remembered set, the GC won't be able to collect the young and the old generation independently.

Constructor Summary

Constructors

Constructor and Description
NoRememberedSet()

Method Summary

Modifier and Type	Method and Description
void	clearRememberedSet(AlignedHeapChunk.AlignedHeader chunk) Clears the remembered set of an aligned chunk.
void	clearRememberedSet(UnalignedHeapChunk.UnalignedHeader chunk) Clears the remembered set of an unaligned chunk.
org.graalvm.compiler.nodes.gc.BarrierSet	createBarrierSet(jdk.vm.ci.meta.MetaAccessProvider metaAccess) Creates the barrier set that the compiler should use for emitting read/write barriers.
void	dirtyCardForAlignedObject(Object object, boolean verifyOnly) Marks an object as dirty.
void	dirtyCardForUnalignedObject(Object object, boolean verifyOnly) Marks an object as dirty.
void	dirtyCardIfNecessary(Object holderObject, Object object) Marks the holderObject as dirty if object is in the young generation.
void	enableRememberedSetForAlignedChunk(HostedByteBufferPointer chunk, int chunkPosition, List<ImageHeapObject> objects) Enables remembered set tracking for an aligned chunk and its objects.
void	enableRememberedSetForChunk(AlignedHeapChunk.AlignedHeader chunk) Enables remembered set tracking for an aligned chunk and its objects.
void	enableRememberedSetForChunk(UnalignedHeapChunk.UnalignedHeader chunk) Enables remembered set tracking for an unaligned chunk and its objects.
void	enableRememberedSetForObject(AlignedHeapChunk.AlignedHeader chunk, Object obj) Enables remembered set tracking for a single object in an aligned chunk.
void	enableRememberedSetForUnalignedChunk(HostedByteBufferPointer chunk) Enables remembered set tracking for an unaligned chunk and its objects.
org.graalvm.word.UnsignedWord	getHeaderSizeOfAlignedChunk() Returns the header size of aligned chunks.
org.graalvm.word.UnsignedWord	getHeaderSizeOfUnalignedChunk() Returns the header size of unaligned chunks.
boolean	hasRememberedSet(org.graalvm.word.UnsignedWord header) Checks if remembered set tracking is enabled for an object.
boolean	verify(AlignedHeapChunk.AlignedHeader firstAlignedHeapChunk) Verify the remembered set for an aligned chunk.
boolean	verify(UnalignedHeapChunk.UnalignedHeader firstUnalignedHeapChunk) Verify the remembered set for an unaligned chunk.
void	walkDirtyObjects(AlignedHeapChunk.AlignedHeader chunk, GreyToBlackObjectVisitor visitor) Walks all dirty objects in an aligned chunk.
void	walkDirtyObjects(Space space, GreyToBlackObjectVisitor visitor) Walks all dirty objects in a Space.
void	walkDirtyObjects(UnalignedHeapChunk.UnalignedHeader chunk, GreyToBlackObjectVisitor visitor) Walks all dirty objects in an unaligned chunk.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.oracle.svm.core.genscavenge.remset.RememberedSet

get

Constructor Detail

NoRememberedSet

public NoRememberedSet()

Method Detail

createBarrierSet

public org.graalvm.compiler.nodes.gc.BarrierSet createBarrierSet(jdk.vm.ci.meta.MetaAccessProvider metaAccess)

Description copied from interface: RememberedSet

Creates the barrier set that the compiler should use for emitting read/write barriers.

Specified by:

createBarrierSet in interface RememberedSet

getHeaderSizeOfAlignedChunk

public org.graalvm.word.UnsignedWord getHeaderSizeOfAlignedChunk()

Description copied from interface: RememberedSet

Returns the header size of aligned chunks.

Specified by:

getHeaderSizeOfAlignedChunk in interface RememberedSet

getHeaderSizeOfUnalignedChunk

public org.graalvm.word.UnsignedWord getHeaderSizeOfUnalignedChunk()

Description copied from interface: RememberedSet

Returns the header size of unaligned chunks.

Specified by:

getHeaderSizeOfUnalignedChunk in interface RememberedSet

enableRememberedSetForAlignedChunk

public void enableRememberedSetForAlignedChunk(HostedByteBufferPointer chunk,
                                               int chunkPosition,
                                               List<ImageHeapObject> objects)

Description copied from interface: RememberedSet

Enables remembered set tracking for an aligned chunk and its objects. Must be called when adding a new chunk to the image heap or old generation.

Specified by:

enableRememberedSetForAlignedChunk in interface RememberedSet

enableRememberedSetForUnalignedChunk

public void enableRememberedSetForUnalignedChunk(HostedByteBufferPointer chunk)

Description copied from interface: RememberedSet

Enables remembered set tracking for an unaligned chunk and its objects. Must be called when adding a new chunk to the image heap or old generation.

Specified by:

enableRememberedSetForUnalignedChunk in interface RememberedSet

enableRememberedSetForChunk

public void enableRememberedSetForChunk(AlignedHeapChunk.AlignedHeader chunk)

Description copied from interface: RememberedSet

Enables remembered set tracking for an aligned chunk and its objects. Must be called when adding a new chunk to the image heap or old generation.

Specified by:

enableRememberedSetForChunk in interface RememberedSet

enableRememberedSetForChunk

public void enableRememberedSetForChunk(UnalignedHeapChunk.UnalignedHeader chunk)

Description copied from interface: RememberedSet

Enables remembered set tracking for an unaligned chunk and its objects. Must be called when adding a new chunk to the image heap or old generation.

Specified by:

enableRememberedSetForChunk in interface RememberedSet

enableRememberedSetForObject

public void enableRememberedSetForObject(AlignedHeapChunk.AlignedHeader chunk,
                                         Object obj)

Description copied from interface: RememberedSet

Enables remembered set tracking for a single object in an aligned chunk. Must be called when an object is added to the image heap or old generation.

Specified by:

enableRememberedSetForObject in interface RememberedSet

clearRememberedSet

public void clearRememberedSet(AlignedHeapChunk.AlignedHeader chunk)

Description copied from interface: RememberedSet

Clears the remembered set of an aligned chunk.

Specified by:

clearRememberedSet in interface RememberedSet

clearRememberedSet

public void clearRememberedSet(UnalignedHeapChunk.UnalignedHeader chunk)

Description copied from interface: RememberedSet

Clears the remembered set of an unaligned chunk.

Specified by:

clearRememberedSet in interface RememberedSet

hasRememberedSet

public boolean hasRememberedSet(org.graalvm.word.UnsignedWord header)

Description copied from interface: RememberedSet

Checks if remembered set tracking is enabled for an object.

Specified by:

hasRememberedSet in interface RememberedSet

dirtyCardForAlignedObject

public void dirtyCardForAlignedObject(Object object,
                                      boolean verifyOnly)

Description copied from interface: RememberedSet

Marks an object as dirty. May only be called for objects for which remembered set tracking is enabled. This tells the GC that the object may contain a reference to the young generation.

Specified by:

dirtyCardForAlignedObject in interface RememberedSet

dirtyCardForUnalignedObject

public void dirtyCardForUnalignedObject(Object object,
                                        boolean verifyOnly)

Description copied from interface: RememberedSet

Marks an object as dirty. May only be called for objects for which remembered set tracking is enabled. This tells the GC that the object may contain a reference to the young generation.

Specified by:

dirtyCardForUnalignedObject in interface RememberedSet

dirtyCardIfNecessary

public void dirtyCardIfNecessary(Object holderObject,
                                 Object object)

Description copied from interface: RememberedSet

Marks the holderObject as dirty if object is in the young generation. May only be called for holderObjects for which remembered set tracking is enabled. This tells the GC that the holderObject may contain a reference to the young generation.

Specified by:

dirtyCardIfNecessary in interface RememberedSet

walkDirtyObjects

public void walkDirtyObjects(AlignedHeapChunk.AlignedHeader chunk,
                             GreyToBlackObjectVisitor visitor)

Description copied from interface: RememberedSet

Walks all dirty objects in an aligned chunk.

Specified by:

walkDirtyObjects in interface RememberedSet

walkDirtyObjects

public void walkDirtyObjects(UnalignedHeapChunk.UnalignedHeader chunk,
                             GreyToBlackObjectVisitor visitor)

Description copied from interface: RememberedSet

Walks all dirty objects in an unaligned chunk.

Specified by:

walkDirtyObjects in interface RememberedSet

walkDirtyObjects

public void walkDirtyObjects(Space space,
                             GreyToBlackObjectVisitor visitor)

Description copied from interface: RememberedSet

Walks all dirty objects in a Space.

Specified by:

walkDirtyObjects in interface RememberedSet

verify

public boolean verify(AlignedHeapChunk.AlignedHeader firstAlignedHeapChunk)

Description copied from interface: RememberedSet

Verify the remembered set for an aligned chunk.

Specified by:

verify in interface RememberedSet

verify

public boolean verify(UnalignedHeapChunk.UnalignedHeader firstUnalignedHeapChunk)

Description copied from interface: RememberedSet

Verify the remembered set for an unaligned chunk.

Specified by:

verify in interface RememberedSet