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.CollectedHeap; 31 import sun.jvm.hotspot.gc.shared.CollectedHeapName; 32 import sun.jvm.hotspot.code.*; 33 import sun.jvm.hotspot.debugger.*; 34 import sun.jvm.hotspot.runtime.*; 35 import sun.jvm.hotspot.types.*; 36 import sun.jvm.hotspot.memory.*; 37 38 public class EpsilonHeap extends CollectedHeap { 39 40 private static Field spaceField; 41 private VirtualSpace space; 42 43 static { 44 VM.registerVMInitializedObserver(new Observer() { 45 public void update(Observable o, Object data) { 46 initialize(VM.getVM().getTypeDataBase()); 47 } 48 }); 49 } 50 51 private static void initialize(TypeDataBase db) { 52 Type type = db.lookupType("EpsilonHeap"); 53 spaceField = type.getField("_virtual_space"); 54 } 55 56 public EpsilonHeap(Address addr) { 57 super(addr); 58 space = new VirtualSpace(addr.addOffsetTo(spaceField.getOffset())); 59 } 60 61 @Override 62 public CollectedHeapName kind() { 63 return CollectedHeapName.EPSILON; 64 } 65 66 public VirtualSpace space() { 67 return space; 68 } 69 70 @Override 71 public void printOn(PrintStream tty) { 72 MemRegion mr = reservedRegion(); 73 tty.println("Epsilon heap"); 74 tty.println(" reserved: [" + mr.start() + ", " + mr.end() + "]"); 75 tty.println(" committed: [" + space.low() + ", " + space.high() + "]"); 76 } 77 78 }