| /* |
| * Copyright (c) 2000, 2012, 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> 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())); |
| } |
| } |