com.oracle.svm.core.heap

Interface ObjectReferenceVisitor

All Known Implementing Classes:

CardTable.ReferenceToYoungObjectReferenceVisitor, GreyToBlackObjRefVisitor

public interface ObjectReferenceVisitor

Visit an object reference. The visitObjectReference method takes a Pointer as a parameter, but that Pointer is *not* a pointer to an Object, but a Pointer to an object reference.

Method Summary

Modifier and Type	Method and Description
default boolean	epilogue() Called after all Object references have been visited.
default boolean	prologue() Called before any Object references are visited.
boolean	visitObjectReference(org.graalvm.word.Pointer objRef, boolean compressed) Visit an Object reference.
default boolean	visitObjectReferenceInline(org.graalvm.word.Pointer objRef, boolean compressed) Like visitObjectReference(Pointer), but always inlined for performance.
default boolean	visitObjectReferenceInline(org.graalvm.word.Pointer objRef, int innerOffset, boolean compressed)

Method Detail

prologue

default boolean prologue()

Called before any Object references are visited.

Returns:

true if visiting should continue, false if visiting should stop.

visitObjectReference

boolean visitObjectReference(org.graalvm.word.Pointer objRef,
                             boolean compressed)

Visit an Object reference. To get the corresponding Object reference.readObject can be used.

Parameters:

objRef - The Object reference to be visited.

compressed - True if the reference is in compressed form, false otherwise.

Returns:

True if visiting should continue, false if visiting should stop.

visitObjectReferenceInline

default boolean visitObjectReferenceInline(org.graalvm.word.Pointer objRef,
                                           boolean compressed)

Like visitObjectReference(Pointer), but always inlined for performance.

visitObjectReferenceInline

default boolean visitObjectReferenceInline(org.graalvm.word.Pointer objRef,
                                           int innerOffset,
                                           boolean compressed)

epilogue

default boolean epilogue()

Called after all Object references have been visited. If visiting terminates because a visitor returned false, this method might not be called.