1 /*
   2  * Copyright (c) 2000, 2012, 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.gc_interface.*;
  32 import sun.jvm.hotspot.runtime.*;
  33 import sun.jvm.hotspot.types.*;
  34 import sun.jvm.hotspot.utilities.*;
  35 
  36 public class GenCollectedHeap extends SharedHeap {
  37   private static CIntegerField nGensField;
  38   private static AddressField youngGenField;
  39   private static AddressField oldGenField;
  40   private static AddressField genSpecsField;
  41 
  42   private static GenerationFactory genFactory;
  43 
  44   static {
  45     VM.registerVMInitializedObserver(new Observer() {
  46         public void update(Observable o, Object data) {
  47           initialize(VM.getVM().getTypeDataBase());
  48         }
  49       });
  50   }
  51 
  52   private static synchronized void initialize(TypeDataBase db) {
  53     Type type = db.lookupType("GenCollectedHeap");
  54 
  55     nGensField = type.getCIntegerField("_n_gens");
  56     youngGenField = type.getAddressField("_young_gen");
  57     oldGenField = type.getAddressField("_old_gen");
  58     genSpecsField = type.getAddressField("_gen_specs");
  59 
  60     genFactory = new GenerationFactory();
  61   }
  62 
  63   public GenCollectedHeap(Address addr) {
  64     super(addr);
  65   }
  66 
  67   public int nGens() {
  68     return (int) nGensField.getValue(addr);
  69   }
  70 
  71   public Generation getGen(int i) {
  72     if (Assert.ASSERTS_ENABLED) {
  73       Assert.that((i >= 0) && (i < nGens()), "Index " + i +
  74                   " out of range (should be between 0 and " + nGens() + ")");
  75     }
  76 
  77     if ((i < 0) || (i >= nGens())) {
  78       return null;
  79     }
  80 
  81     if (i == 0) {
  82       return genFactory.newObject(youngGenField.getAddress());
  83     } else {
  84       return genFactory.newObject(oldGenField.getAddress());
  85     }
  86   }
  87 
  88   public boolean isIn(Address a) {
  89     for (int i = 0; i < nGens(); i++) {
  90       Generation gen = getGen(i);
  91       if (gen.isIn(a)) {
  92         return true;
  93       }
  94     }
  95 
  96     return false;
  97   }
  98 
  99   public long capacity() {
 100     long capacity = 0;
 101     for (int i = 0; i < nGens(); i++) {
 102       capacity += getGen(i).capacity();
 103     }
 104     return capacity;
 105   }
 106 
 107   public long used() {
 108     long used = 0;
 109     for (int i = 0; i < nGens(); i++) {
 110       used += getGen(i).used();
 111     }
 112     return used;
 113   }
 114 
 115   /** Package-private access to GenerationSpecs */
 116   GenerationSpec spec(int level) {
 117     if (Assert.ASSERTS_ENABLED) {
 118       Assert.that((level >= 0) && (level < nGens()), "Index " + level +
 119                   " out of range (should be between 0 and " + nGens() + ")");
 120     }
 121 
 122     if ((level < 0) || (level >= nGens())) {
 123       return null;
 124     }
 125 
 126     Address ptrList = genSpecsField.getValue(addr);
 127     if (ptrList == null) {
 128       return null;
 129     }
 130     return (GenerationSpec)
 131       VMObjectFactory.newObject(GenerationSpec.class,
 132                                 ptrList.getAddressAt(level * VM.getVM().getAddressSize()));
 133   }
 134 
 135   public CollectedHeapName kind() {
 136     return CollectedHeapName.GEN_COLLECTED_HEAP;
 137   }
 138 
 139   public void printOn(PrintStream tty) {
 140     for (int i = 0; i < nGens(); i++) {
 141       tty.print("Gen " + i + ": ");
 142       getGen(i).printOn(tty);
 143       tty.println("Invocations: " + getGen(i).invocations());
 144       tty.println();
 145     }
 146   }
 147 }
--- EOF ---