1 /* 2 * Copyright (c) 2003, 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_implementation.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 ImmutableSpace extends VMObject { 36 static { 37 VM.registerVMInitializedObserver(new Observer() { 38 public void update(Observable o, Object data) { 39 initialize(VM.getVM().getTypeDataBase()); 40 } 41 }); 42 } 43 44 private static synchronized void initialize(TypeDataBase db) { 45 Type type = db.lookupType("ImmutableSpace"); 46 bottomField = type.getAddressField("_bottom"); 47 endField = type.getAddressField("_end"); 48 } 49 50 public ImmutableSpace(Address addr) { 51 super(addr); 52 } 53 54 // Fields 55 private static AddressField bottomField; 56 private static AddressField endField; 57 58 // Accessors 59 public Address bottom() { return bottomField.getValue(addr); } 60 public Address end() { return endField.getValue(addr); } 61 62 /** Returns a subregion of the space containing all the objects in 63 the space. */ 64 public MemRegion usedRegion() { 65 return new MemRegion(bottom(), end()); 66 } 67 68 /** Support for iteration over heap -- not sure how this will 69 interact with GC in reflective system, but necessary for the 70 debugging mechanism */ 71 public OopHandle bottomAsOopHandle() { 72 return bottomField.getOopHandle(addr); 73 } 74 75 /** returns all MemRegions where live objects are */ 76 public abstract List/*<MemRegion>*/ getLiveRegions(); 77 78 /** Returned value is in bytes */ 79 public long capacity() { return end().minus(bottom()); } 80 81 public abstract long used(); 82 83 /** Testers */ 84 public boolean contains(Address p) { 85 return (bottom().lessThanOrEqual(p) && end().greaterThan(p)); 86 } 87 88 public void print() { printOn(System.out); } 89 public abstract void printOn(PrintStream tty); 90 }