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/*
* Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
package sun.jvm.hotspot.memory;
import java.io.*;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.runtime.*;
/** <P> The (supported) Generation hierarchy currently looks like this: </P>
<ul>
<li> Generation
<ul>
<li> CardGeneration
<ul>
<li> OneContigSpaceCardGeneration
<ul>
<li> CompactingPermGenGen
<li> TenuredGeneration
</ul>
</ul>
<li> DefNewGeneration
</ul>
</ul>
*/
public abstract class Generation extends VMObject {
private static long reservedFieldOffset;
private static long virtualSpaceFieldOffset;
private static CIntegerField levelField;
protected static final int K = 1024;
// Fields for class StatRecord
private static Field statRecordField;
private static CIntegerField invocationField;
// constants from Name enum
private static int NAME_DEF_NEW;
private static int NAME_PAR_NEW;
private static int NAME_MARK_SWEEP_COMPACT;
private static int NAME_CONCURRENT_MARK_SWEEP;
private static int NAME_OTHER;
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("Generation");
reservedFieldOffset = type.getField("_reserved").getOffset();
virtualSpaceFieldOffset = type.getField("_virtual_space").getOffset();
levelField = type.getCIntegerField("_level");
// StatRecord
statRecordField = type.getField("_stat_record");
type = db.lookupType("Generation::StatRecord");
invocationField = type.getCIntegerField("invocations");
// constants from Generation::Name
NAME_DEF_NEW = db.lookupIntConstant("Generation::DefNew").intValue();
NAME_PAR_NEW = db.lookupIntConstant("Generation::ParNew").intValue();
NAME_MARK_SWEEP_COMPACT = db.lookupIntConstant("Generation::MarkSweepCompact").intValue();
NAME_CONCURRENT_MARK_SWEEP = db.lookupIntConstant("Generation::ConcurrentMarkSweep").intValue();
NAME_OTHER = db.lookupIntConstant("Generation::Other").intValue();
}
public Generation(Address addr) {
super(addr);
}
public static class Name {
public static final Name DEF_NEW = new Name("DefNew");
public static final Name PAR_NEW = new Name("ParNew");
public static final Name MARK_SWEEP_COMPACT = new Name("MarkSweepCompact");
public static final Name CONCURRENT_MARK_SWEEP = new Name("ConcurrentMarkSweep");
public static final Name OTHER = new Name("Other");
private Name(String value) {
this.value = value;
}
private String value;
public String toString() {
return value;
}
}
public Generation.Name kind() {
return Generation.Name.OTHER;
}
static Generation.Name nameForEnum(int value) {
if (value == NAME_DEF_NEW) {
return Name.DEF_NEW;
} else if (value == NAME_PAR_NEW) {
return Name.PAR_NEW;
} else if (value == NAME_MARK_SWEEP_COMPACT) {
return Name.MARK_SWEEP_COMPACT;
} else if (value == NAME_CONCURRENT_MARK_SWEEP) {
return Name.CONCURRENT_MARK_SWEEP;
} else if (value == NAME_OTHER) {
return Name.OTHER;
} else {
throw new RuntimeException("should not reach here");
}
}
public GenerationSpec spec() {
return ((GenCollectedHeap) VM.getVM().getUniverse().heap()).spec(level());
}
public int level() {
return (int) levelField.getValue(addr);
}
public int invocations() {
return getStatRecord().getInvocations();
}
/** The maximum number of object bytes the generation can currently
hold. */
public abstract long capacity();
/** The number of used bytes in the gen. */
public abstract long used();
/** The number of free bytes in the gen. */
public abstract long free();
/** The largest number of contiguous free words in the generation,
including expansion. (VM's version assumes it is called at a
safepoint.) */
public abstract long contiguousAvailable();
public MemRegion reserved() {
return new MemRegion(addr.addOffsetTo(reservedFieldOffset));
}
/** Returns a region guaranteed to contain all the objects in the
generation. */
public MemRegion usedRegion() {
return reserved();
}
/* Returns "TRUE" iff "p" points into an allocated object in the
generation. */
public boolean isIn(Address p) {
GenerationIsInClosure blk = new GenerationIsInClosure(p);
spaceIterate(blk);
return (blk.space() != null);
}
/** Returns "TRUE" iff "p" points into the reserved area of the
generation. */
public boolean isInReserved(Address p) {
return reserved().contains(p);
}
protected VirtualSpace virtualSpace() {
return (VirtualSpace) VMObjectFactory.newObject(VirtualSpace.class, addr.addOffsetTo(virtualSpaceFieldOffset));
}
public abstract String name();
/** Equivalent to spaceIterate(blk, false) */
public void spaceIterate(SpaceClosure blk) {
spaceIterate(blk, false);
}
/** Iteration - do not use for time critical operations */
public abstract void spaceIterate(SpaceClosure blk, boolean usedOnly);
public void print() { printOn(System.out); }
public abstract void printOn(PrintStream tty);
public static class StatRecord extends VMObject {
public StatRecord(Address addr) {
super(addr);
}
public int getInvocations() {
return (int) invocationField.getValue(addr);
}
}
private StatRecord getStatRecord() {
return (StatRecord) VMObjectFactory.newObject(Generation.StatRecord.class, addr.addOffsetTo(statRecordField.getOffset()));
}
}
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