1 /* 2 * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates. 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.epsilon; 26 27 import java.io.*; 28 import java.util.*; 29 30 import sun.jvm.hotspot.gc.shared.*; 31 import sun.jvm.hotspot.code.*; 32 import sun.jvm.hotspot.debugger.*; 33 import sun.jvm.hotspot.runtime.*; 34 import sun.jvm.hotspot.types.*; 35 import sun.jvm.hotspot.memory.*; 36 37 public class EpsilonHeap extends CollectedHeap { 38 39 private static AddressField spaceField; 40 private static Field virtualSpaceField; 41 private ContiguousSpace space; 42 private VirtualSpace virtualSpace; 43 44 static { 45 VM.registerVMInitializedObserver(new Observer() { 46 public void update(Observable o, Object data) { 47 initialize(VM.getVM().getTypeDataBase()); 48 } 49 }); 50 } 51 52 private static void initialize(TypeDataBase db) { 53 Type type = db.lookupType("EpsilonHeap"); 54 spaceField = type.getAddressField("_space"); 55 virtualSpaceField = type.getField("_virtual_space"); 56 } 57 58 public EpsilonHeap(Address addr) { 59 super(addr); 60 space = new ContiguousSpace(spaceField.getValue(addr)); 61 virtualSpace = new VirtualSpace(addr.addOffsetTo(virtualSpaceField.getOffset())); 62 } 63 64 @Override 65 public CollectedHeapName kind() { 66 return CollectedHeapName.EPSILON; 67 } 68 69 @Override 70 public long capacity() { 71 return space.capacity(); 72 } 73 74 @Override 75 public long used() { 76 return space.used(); 77 } 78 79 public ContiguousSpace space() { 80 return space; 81 } 82 83 @Override 84 public void printOn(PrintStream tty) { 85 MemRegion mr = reservedRegion(); 86 tty.println("Epsilon heap"); 87 tty.println(" reserved: [" + mr.start() + ", " + mr.end() + "]"); 88 tty.println(" committed: [" + virtualSpace.low() + ", " + virtualSpace.high() + "]"); 89 tty.println(" used: [" + space.bottom() + ", " + space.top() + "]"); 90 } 91 92 }