/*
* 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.
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*/
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) {
/**代码未完, 请加载全部代码(NowJava.com).**/