1 /* 2 * Copyright (c) 2000, 2019, 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 import sun.jvm.hotspot.utilities.BitMapInterface; 35 import sun.jvm.hotspot.utilities.BitMapSegmented; 36 37 public abstract class CollectedHeap extends VMObject { 38 private static long reservedFieldOffset; 39 40 static { 41 VM.registerVMInitializedObserver(new Observer() { 42 public void update(Observable o, Object data) { 43 initialize(VM.getVM().getTypeDataBase()); 44 } 45 }); 46 } 47 48 private static synchronized void initialize(TypeDataBase db) { 49 Type type = db.lookupType("CollectedHeap"); 50 51 reservedFieldOffset = type.getField("_reserved").getOffset(); 52 } 53 54 public CollectedHeap(Address addr) { 55 super(addr); 56 } 57 58 /** Returns the lowest address of the heap. */ 59 public Address start() { 60 return reservedRegion().start(); 61 } 62 63 public abstract long capacity(); 64 public abstract long used(); 65 66 public MemRegion reservedRegion() { 67 return new MemRegion(addr.addOffsetTo(reservedFieldOffset)); 68 } 69 70 public boolean isIn(Address a) { 71 return isInReserved(a); 72 } 73 74 public boolean isInReserved(Address a) { 75 return reservedRegion().contains(a); 76 } 77 78 public abstract CollectedHeapName kind(); 79 80 public String oopAddressDescription(OopHandle handle) { 81 return handle.toString(); 82 } 83 84 public OopHandle oop_load_at(OopHandle handle, long offset) { 85 return handle.getOopHandleAt(offset); 86 } 87 88 public OopHandle oop_load_in_native(Address addr) { 89 return addr.getOopHandleAt(0); 90 } 91 92 public void print() { printOn(System.out); } 93 public void printOn(PrintStream tty) { 94 MemRegion mr = reservedRegion(); 95 tty.println("unknown subtype of CollectedHeap @ " + getAddress() + " (" + 96 mr.start() + "," + mr.end() + ")"); 97 } 98 99 public BitMapInterface createBitMap(long bits) { 100 return new BitMapSegmented(bits); 101 } 102 }