| /* |
| * Copyright (c) 2000, 2001, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.memory; |
| |
| import java.util.*; |
| |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.runtime.*; |
| import sun.jvm.hotspot.types.*; |
| import sun.jvm.hotspot.utilities.*; |
| |
| /** A very simple data structure representing a contigous region of |
| address space. */ |
| |
| public class MemRegion implements Cloneable { |
| private Address start; |
| private long byteSize; |
| |
| private static AddressField startField; |
| private static CIntegerField wordSizeField; |
| |
| static { |
| VM.registerVMInitializedObserver(new Observer() { |
| public void update(Observable o, Object data) { |
| initialize(VM.getVM().getTypeDataBase()); |
| } |
| }); |
| } |
| |
| private static synchronized void initialize(TypeDataBase db) { |
| Type type = db.lookupType("MemRegion"); |
| |
| startField = type.getAddressField("_start"); |
| wordSizeField = type.getCIntegerField("_word_size"); |
| } |
| |
| public MemRegion() { |
| } |
| |
| /** This constructor takes a "MemRegion*" in the target process */ |
| public MemRegion(Address memRegionAddr) { |
| this(startField.getValue(memRegionAddr), |
| wordSizeField.getValue(memRegionAddr)); |
| } |
| |
| public MemRegion(Address start, long wordSize) { |
| setStart(start); |
| setWordSize(wordSize); |
| } |
| |
| public MemRegion(Address start, Address limit) { |
| setStart(start); |
| byteSize = limit.minus(start); |
| } |
| |
| public Object clone() { |
| return new MemRegion(start, byteSize); |
| } |
| |
| public MemRegion copy() { |
| return (MemRegion) clone(); |
| } |
| |
| public MemRegion intersection(MemRegion mr2) { |
| MemRegion res = new MemRegion(); |
| if (AddressOps.gt(mr2.start(), start())) { |
| res.setStart(mr2.start()); |
| } else { |
| res.setStart(start()); |
| } |
| Address resEnd; |
| Address end = end(); |
| Address mr2End = mr2.end(); |
| if (AddressOps.lt(end, mr2End)) { |
| resEnd = end; |
| } else { |
| resEnd = mr2End; |
| } |
| if (AddressOps.lt(resEnd, res.start())) { |
| res.setStart(null); |
| res.setWordSize(0); |
| } else { |
| res.setEnd(resEnd); |
| } |
| return res; |
| } |
| |
| public MemRegion union(MemRegion mr2) { |
| MemRegion res = new MemRegion(); |
| if (AddressOps.lt(mr2.start(), start())) { |
| res.setStart(mr2.start()); |
| } else { |
| res.setStart(start()); |
| } |
| Address resEnd; |
| Address end = end(); |
| Address mr2End = mr2.end(); |
| if (AddressOps.gt(end, mr2End)) { |
| resEnd = end; |
| } else { |
| resEnd = mr2End; |
| } |
| res.setEnd(resEnd); |
| return res; |
| } |
| |
| public Address start() { |
| return start; |
| } |
| |
| public OopHandle startAsOopHandle() { |
| return start().addOffsetToAsOopHandle(0); |
| } |
| |
| public Address end() { |
| return start.addOffsetTo(byteSize); |
| } |
| |
| public OopHandle endAsOopHandle() { |
| return end().addOffsetToAsOopHandle(0); |
| } |
| |
| public void setStart(Address start) { |
| this.start = start; |
| } |
| |
| public void setEnd(Address end) { |
| byteSize = end.minus(start); |
| } |
| |
| public void setWordSize(long wordSize) { |
| byteSize = VM.getVM().getAddressSize() * wordSize; |
| } |
| |
| public boolean contains(MemRegion mr2) { |
| return AddressOps.lte(start, mr2.start) && AddressOps.gte(end(), mr2.end()); |
| } |
| |
| public boolean contains(Address addr) { |
| return AddressOps.gte(addr, start()) && AddressOps.lt(addr, end()); |
| } |
| |
| public long byteSize() { |
| return byteSize; |
| } |
| |
| public long wordSize() { |
| return byteSize / VM.getVM().getAddressSize(); |
| } |
| } |