1 /*
   2  * Copyright (c) 2003, 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_implementation.parallelScavenge;
  26 
  27 import java.io.*;
  28 import java.util.*;
  29 
  30 import sun.jvm.hotspot.debugger.*;
  31 import sun.jvm.hotspot.gc_implementation.shared.*;
  32 import sun.jvm.hotspot.memory.*;
  33 import sun.jvm.hotspot.runtime.*;
  34 import sun.jvm.hotspot.types.*;
  35 
  36 public class PSYoungGen extends VMObject {
  37    static {
  38       VM.registerVMInitializedObserver(new Observer() {
  39          public void update(Observable o, Object data) {
  40             initialize(VM.getVM().getTypeDataBase());
  41          }
  42       });
  43    }
  44 
  45    private static synchronized void initialize(TypeDataBase db) {
  46       Type type = db.lookupType("PSYoungGen");
  47       edenSpaceField = type.getAddressField("_eden_space");
  48       fromSpaceField = type.getAddressField("_from_space");
  49       toSpaceField = type.getAddressField("_to_space");
  50    }
  51 
  52    public PSYoungGen(Address addr) {
  53       super(addr);
  54    }
  55 
  56    // Fields
  57    private static AddressField edenSpaceField;
  58    private static AddressField fromSpaceField;
  59    private static AddressField toSpaceField;
  60 
  61    // Accessors
  62    public MutableSpace edenSpace() {
  63       return (MutableSpace) VMObjectFactory.newObject(MutableSpace.class, edenSpaceField.getValue(addr));
  64    }
  65 
  66    public MutableSpace fromSpace() {
  67       return (MutableSpace) VMObjectFactory.newObject(MutableSpace.class, fromSpaceField.getValue(addr));
  68    }
  69 
  70    public MutableSpace toSpace() {
  71       return (MutableSpace) VMObjectFactory.newObject(MutableSpace.class, toSpaceField.getValue(addr));
  72    }
  73 
  74    public long capacity() {
  75       return edenSpace().capacity() + fromSpace().capacity();
  76    }
  77 
  78    public long used() {
  79       return edenSpace().used() + fromSpace().used();
  80    }
  81 
  82    public boolean isIn(Address a) {
  83       if (edenSpace().contains(a)) {
  84          return true;
  85       }
  86 
  87       if (fromSpace().contains(a)) {
  88          return true;
  89       }
  90       return false;
  91    }
  92 
  93    public void printOn(PrintStream tty) {
  94       tty.print("PSYoungGen [ ");
  95       tty.print("eden = ");
  96       edenSpace().printOn(tty);
  97       tty.print(", from = ");
  98       fromSpace().printOn(tty);
  99       tty.print(", to = ");
 100       toSpace().printOn(tty);
 101       tty.print(" ] ");
 102    }
 103 }