1 /* 2 * Copyright (c) 2000, 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.shared; 26 27 import java.io.*; 28 import java.util.*; 29 30 import sun.jvm.hotspot.debugger.*; 31 import sun.jvm.hotspot.memory.*; 32 import sun.jvm.hotspot.runtime.*; 33 import sun.jvm.hotspot.types.*; 34 35 public abstract class CollectedHeap extends VMObject { 36 private static long reservedFieldOffset; 37 38 static { 39 VM.registerVMInitializedObserver(new Observer() { 40 public void update(Observable o, Object data) { 41 initialize(VM.getVM().getTypeDataBase()); 42 } 43 }); 44 } 45 46 private static synchronized void initialize(TypeDataBase db) { 47 Type type = db.lookupType("CollectedHeap"); 48 49 reservedFieldOffset = type.getField("_reserved").getOffset(); 50 } 51 52 public CollectedHeap(Address addr) { 53 super(addr); 54 } 55 56 /** Returns the lowest address of the heap. */ 57 public Address start() { 58 return reservedRegion().start(); 59 } 60 61 public long capacity() { return 0; } 62 public long used() { return 0; } 63 64 public MemRegion reservedRegion() { 65 return new MemRegion(addr.addOffsetTo(reservedFieldOffset)); 66 } 67 68 public boolean isIn(Address a) { 69 return isInReserved(a); 70 } 71 72 public boolean isInReserved(Address a) { 73 return reservedRegion().contains(a); 74 } 75 76 public abstract CollectedHeapName kind(); 77 78 public void print() { printOn(System.out); } 79 public void printOn(PrintStream tty) { 80 MemRegion mr = reservedRegion(); 81 tty.println("unknown subtype of CollectedHeap @ " + getAddress() + " (" + 82 mr.start() + "," + mr.end() + ")"); 83 } 84 }