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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
 * 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.
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package sun.jvm.hotspot.gc.shared;

import java.io.*;
import java.util.*;

import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.memory.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.Observable;
import sun.jvm.hotspot.utilities.Observer;

public class ContiguousSpace extends CompactibleSpace implements LiveRegionsProvider {
  private static AddressField topField;

  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("ContiguousSpace");

    topField = type.getAddressField("_top");
  }

  public ContiguousSpace(Address addr) {
    super(addr);
  }

  public Address top() {
    return topField.getValue(addr);
  }

  
In bytes
/** In bytes */
public long capacity() { return end().minus(bottom()); }
In bytes
/** In bytes */
public long used() { return top().minus(bottom()); }
In bytes
/** In bytes */
public long free() { return end().minus(top()); }
In a contiguous space we have a more obvious bound on what parts contain objects.
/** In a contiguous space we have a more obvious bound on what parts contain objects. */
public MemRegion usedRegion() { return new MemRegion(bottom(), top()); }
Returns regions of Space where live objects live
/** Returns regions of Space where live objects live */
public List<MemRegion> getLiveRegions() { List<MemRegion> res = new ArrayList<>(); res.add(new MemRegion(bottom(), top())); return res; }
Testers
/** Testers */
public boolean contains(Address p) { return (bottom().lessThanOrEqual(p) && top().greaterThan(p)); } public void printOn(PrintStream tty) { tty.print(" [" + bottom() + "," + top() + "," + end() + ")"); super.printOn(tty); } }