1 /* 2 * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.memory; 26 27 import java.io.*; 28 import java.util.*; 29 30 import sun.jvm.hotspot.debugger.*; 31 import sun.jvm.hotspot.runtime.*; 32 import sun.jvm.hotspot.types.*; 33 34 /** <P> OneSpaceOldGeneration models a heap of old objects contained 35 in a single contiguous space. </P> 36 37 <P> Garbage collection is performed using mark-compact. </P> */ 38 39 public abstract class OneContigSpaceCardGeneration extends CardGeneration { 40 private static AddressField theSpaceField; 41 42 static { 43 VM.registerVMInitializedObserver(new Observer() { 44 public void update(Observable o, Object data) { 45 initialize(VM.getVM().getTypeDataBase()); 46 } 47 }); 48 } 49 50 private static synchronized void initialize(TypeDataBase db) { 51 Type type = db.lookupType("OneContigSpaceCardGeneration"); 52 53 theSpaceField = type.getAddressField("_the_space"); 54 } 55 56 public OneContigSpaceCardGeneration(Address addr) { 57 super(addr); 58 } 59 60 public ContiguousSpace theSpace() { 61 return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, theSpaceField.getValue(addr)); 62 } 63 64 public boolean isIn(Address p) { 65 return theSpace().contains(p); 66 } 67 68 /** Space queries */ 69 public long capacity() { return theSpace().capacity(); } 70 public long used() { return theSpace().used(); } 71 public long free() { return theSpace().free(); } 72 public long contiguousAvailable() { return theSpace().free() + virtualSpace().uncommittedSize(); } 73 74 public void spaceIterate(SpaceClosure blk, boolean usedOnly) { 75 blk.doSpace(theSpace()); 76 } 77 78 public void printOn(PrintStream tty) { 79 tty.print(" old "); 80 theSpace().printOn(tty); 81 } 82 }