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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.
/** 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
/** 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(); } }