1 /*
   2  * Copyright (c) 2000, 2015, 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.shared;
  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 import sun.jvm.hotspot.utilities.*;
  34 
  35 public class GenCollectedHeap extends CollectedHeap {
  36   private static AddressField youngGenField;
  37   private static AddressField oldGenField;
  38 
  39   private static AddressField youngGenSpecField;
  40   private static AddressField oldGenSpecField;
  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     youngGenField = type.getAddressField("_young_gen");
  56     oldGenField = type.getAddressField("_old_gen");
  57 
  58     genFactory = new GenerationFactory();
  59 
  60     Type collectorPolicyType = db.lookupType("GenCollectorPolicy");
  61     youngGenSpecField = collectorPolicyType.getAddressField("_young_gen_spec");
  62     oldGenSpecField = collectorPolicyType.getAddressField("_old_gen_spec");
  63   }
  64 
  65   public GenCollectedHeap(Address addr) {
  66     super(addr);
  67   }
  68 
  69   public int nGens() {
  70     return 2; // Young + Old
  71   }
  72 
  73   public Generation getGen(int i) {
  74     if (Assert.ASSERTS_ENABLED) {
  75       Assert.that((i == 0) || (i == 1), "Index " + i +
  76                   " out of range (should be 0 or 1)");
  77     }
  78 
  79     switch (i) {
  80     case 0:
  81       return genFactory.newObject(youngGenField.getValue(addr));
  82     case 1:
  83       return genFactory.newObject(oldGenField.getValue(addr));
  84     default:
  85       // no generation for i, and assertions disabled.
  86       return null;
  87     }
  88   }
  89 
  90   public boolean isIn(Address a) {
  91     for (int i = 0; i < nGens(); i++) {
  92       Generation gen = getGen(i);
  93       if (gen.isIn(a)) {
  94         return true;
  95       }
  96     }
  97 
  98     return false;
  99   }
 100 
 101   public long capacity() {
 102     long capacity = 0;
 103     for (int i = 0; i < nGens(); i++) {
 104       capacity += getGen(i).capacity();
 105     }
 106     return capacity;
 107   }
 108 
 109   public long used() {
 110     long used = 0;
 111     for (int i = 0; i < nGens(); i++) {
 112       used += getGen(i).used();
 113     }
 114     return used;
 115   }
 116 
 117   /** Package-private access to GenerationSpecs */
 118   GenerationSpec spec(int level) {
 119     if (Assert.ASSERTS_ENABLED) {
 120       Assert.that((level == 0) || (level == 1), "Index " + level +
 121                   " out of range (should be 0 or 1)");
 122     }
 123 
 124     if ((level != 0) && (level != 1)) {
 125       return null;
 126     }
 127 
 128     if (level == 0) {
 129       return (GenerationSpec)
 130               VMObjectFactory.newObject(GenerationSpec.class,
 131                       youngGenSpecField.getAddress());
 132     } else {
 133       return (GenerationSpec)
 134               VMObjectFactory.newObject(GenerationSpec.class,
 135                       oldGenSpecField.getAddress());
 136     }
 137   }
 138 
 139   public CollectedHeapName kind() {
 140     return CollectedHeapName.GEN_COLLECTED_HEAP;
 141   }
 142 
 143   public void printOn(PrintStream tty) {
 144     for (int i = 0; i < nGens(); i++) {
 145       tty.print("Gen " + i + ": ");
 146       getGen(i).printOn(tty);
 147       tty.println("Invocations: " + getGen(i).invocations());
 148       tty.println();
 149     }
 150   }
 151 }