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package sun.jvm.hotspot.gc.serial;

import java.io.*;
import java.util.*;

import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.gc.shared.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.Observable;
import sun.jvm.hotspot.utilities.Observer;

TenuredGeneration models a heap of old objects contained in a single contiguous space.

Garbage collection is performed using mark-compact.

/** <P> TenuredGeneration models a heap of old objects contained in a single contiguous space. </P> <P> Garbage collection is performed using mark-compact. </P> */
public class TenuredGeneration extends CardGeneration { private static AddressField theSpaceField; static { VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } }); } private static synchronized void initialize(TypeDataBase db) { Type type = db.lookupType("TenuredGeneration"); theSpaceField = type.getAddressField("_the_space"); } public TenuredGeneration(Address addr) { super(addr); } public ContiguousSpace theSpace() { return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, theSpaceField.getValue(addr)); } public boolean isIn(Address p) { return theSpace().contains(p); }
Space queries
/** Space queries */
public long capacity() { return theSpace().capacity(); } public long used() { return theSpace().used(); } public long free() { return theSpace().free(); } public long contiguousAvailable() { return theSpace().free() + virtualSpace().uncommittedSize(); } public void spaceIterate(SpaceClosure blk, boolean usedOnly) { blk.doSpace(theSpace()); } public void liveRegionsIterate(LiveRegionsClosure closure) { closure.doLiveRegions(theSpace()); } public void printOn(PrintStream tty) { tty.print(" old "); theSpace().printOn(tty); } public Generation.Name kind() { return Generation.Name.MARK_SWEEP_COMPACT; } public String name() { return "tenured generation"; } }