1 /*
   2  * Copyright (c) 2000, 2008, 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.memory;
  26 
  27 import java.io.*;
  28 import java.util.*;
  29 
  30 import sun.jvm.hotspot.debugger.*;
  31 import sun.jvm.hotspot.runtime.*;
  32 import sun.jvm.hotspot.types.*;
  33 
  34 /** DefNewGeneration is a young generation containing eden, from- and
  35     to-space. */
  36 
  37 public class DefNewGeneration extends Generation {
  38   protected static AddressField edenSpaceField;
  39   protected static AddressField fromSpaceField;
  40   protected static AddressField toSpaceField;
  41 
  42   static {
  43     VM.registerVMInitializedObserver(new Observer() {
  44         public void update(Observable o, Object data) {
  45           initialize(VM.getVM().getTypeDataBase());
  46         }
  47       });
  48   }
  49 
  50   private static synchronized void initialize(TypeDataBase db) {
  51     Type type = db.lookupType("DefNewGeneration");
  52 
  53     edenSpaceField = type.getAddressField("_eden_space");
  54     fromSpaceField = type.getAddressField("_from_space");
  55     toSpaceField   = type.getAddressField("_to_space");
  56   }
  57 
  58   public DefNewGeneration(Address addr) {
  59     super(addr);
  60   }
  61 
  62   public Generation.Name kind() {
  63     return Generation.Name.DEF_NEW;
  64   }
  65 
  66   // Accessing spaces
  67   public EdenSpace eden() {
  68     return (EdenSpace) VMObjectFactory.newObject(EdenSpace.class, edenSpaceField.getValue(addr));
  69   }
  70 
  71   public ContiguousSpace from() {
  72     return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, fromSpaceField.getValue(addr));
  73   }
  74 
  75   public ContiguousSpace to() {
  76     return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, toSpaceField.getValue(addr));
  77   }
  78 
  79   public long capacity()            { return eden().capacity() + from().capacity(); /* to() is only used during scavenge */ }
  80   public long used()                { return eden().used()     + from().used();     /* to() is only used during scavenge */ }
  81   public long free()                { return eden().free()     + from().free();     /* to() is only used during scavenge */ }
  82   public long contiguousAvailable() { return eden().free(); }
  83 
  84   public String name() {
  85     return "default new generation";
  86   }
  87 
  88   public void spaceIterate(SpaceClosure blk, boolean usedOnly) {
  89     blk.doSpace(eden());
  90     blk.doSpace(from());
  91     if (!usedOnly) {
  92       blk.doSpace(to());
  93     }
  94   }
  95 
  96   public void printOn(PrintStream tty) {
  97     tty.print("  eden");
  98     eden().printOn(tty);
  99     tty.print("\n  from");
 100     from().printOn(tty);
 101     tty.print("\n  to  ");
 102     to().printOn(tty);
 103   }
 104 }