1 /* 2 * Copyright (c) 2003, 2015, 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.gc.cms; 26 27 import java.io.*; 28 import java.util.*; 29 import sun.jvm.hotspot.debugger.*; 30 import sun.jvm.hotspot.gc.shared.*; 31 import sun.jvm.hotspot.runtime.*; 32 import sun.jvm.hotspot.types.*; 33 34 public class ConcurrentMarkSweepGeneration extends CardGeneration { 35 private static AddressField cmsSpaceField; 36 37 public ConcurrentMarkSweepGeneration(Address addr) { 38 super(addr); 39 } 40 41 static { 42 VM.registerVMInitializedObserver(new Observer() { 43 public void update(Observable o, Object data) { 44 initialize(VM.getVM().getTypeDataBase()); 45 } 46 }); 47 } 48 49 private static synchronized void initialize(TypeDataBase db) { 50 Type type = db.lookupType("ConcurrentMarkSweepGeneration"); 51 cmsSpaceField = type.getAddressField("_cmsSpace"); 52 } 53 54 // Accessing space 55 public CompactibleFreeListSpace cmsSpace() { 56 return (CompactibleFreeListSpace) VMObjectFactory.newObject( 57 CompactibleFreeListSpace.class, 58 cmsSpaceField.getValue(addr)); 59 } 60 61 public long capacity() { return cmsSpace().capacity(); } 62 public long used() { return cmsSpace().used(); } 63 public long free() { return cmsSpace().free(); } 64 public long contiguousAvailable() { throw new RuntimeException("not yet implemented"); } 65 public boolean contains(Address p) { return cmsSpace().contains(p); } 66 public void spaceIterate(SpaceClosure blk, boolean usedOnly) { 67 blk.doSpace(cmsSpace()); 68 } 69 70 public Generation.Name kind() { 71 return Generation.Name.CONCURRENT_MARK_SWEEP; 72 } 73 74 public String name() { 75 return "concurrent mark-sweep generation"; 76 } 77 78 public void printOn(PrintStream tty) { 79 tty.println(name()); 80 cmsSpace().printOn(tty); 81 } 82 }