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.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 
  41   private static AddressField youngGenSpecField;
  42   private static AddressField oldGenSpecField;
  43 
  44   private static GenerationFactory genFactory;
  45 
  46   static {
  47     VM.registerVMInitializedObserver(new Observer() {
  48         public void update(Observable o, Object data) {
  49           initialize(VM.getVM().getTypeDataBase());
  50         }
  51       });
  52   }
  53 
  54   private static synchronized void initialize(TypeDataBase db) {
  55     Type type = db.lookupType("GenCollectedHeap");
  56 
  57     nGensField = type.getCIntegerField("_n_gens");
  58     youngGenField = type.getAddressField("_young_gen");
  59     oldGenField = type.getAddressField("_old_gen");
  60 
  61     genFactory = new GenerationFactory();
  62 
  63     Type collectorPolicyType = db.lookupType("GenCollectorPolicy");
  64     youngGenSpecField = collectorPolicyType.getAddressField("_young_gen_spec");
  65     oldGenSpecField = collectorPolicyType.getAddressField("_old_gen_spec");
  66   }
  67 
  68   public GenCollectedHeap(Address addr) {
  69     super(addr);
  70   }
  71 
  72   public int nGens() {
  73     return (int) nGensField.getValue(addr);
  74   }
  75 
  76   public Generation getGen(int i) {
  77     if (Assert.ASSERTS_ENABLED) {
  78       Assert.that((i == 0) || (i == 1), "Index " + i +
  79                   " out of range (should be 0 or 1)");
  80     }
  81 
  82     switch (i) {
  83     case 0:
  84       return genFactory.newObject(youngGenField.getValue(addr));
  85     case 1:
  86       return genFactory.newObject(oldGenField.getValue(addr));
  87     default:
  88       // no generation for i, and assertions disabled.
  89       return null;
  90     }
  91   }
  92 
  93   public boolean isIn(Address a) {
  94     for (int i = 0; i < nGens(); i++) {
  95       Generation gen = getGen(i);
  96       if (gen.isIn(a)) {
  97         return true;
  98       }
  99     }
 100 
 101     return false;
 102   }
 103 
 104   public long capacity() {
 105     long capacity = 0;
 106     for (int i = 0; i < nGens(); i++) {
 107       capacity += getGen(i).capacity();
 108     }
 109     return capacity;
 110   }
 111 
 112   public long used() {
 113     long used = 0;
 114     for (int i = 0; i < nGens(); i++) {
 115       used += getGen(i).used();
 116     }
 117     return used;
 118   }
 119 
 120   /** Package-private access to GenerationSpecs */
 121   GenerationSpec spec(int level) {
 122     if (Assert.ASSERTS_ENABLED) {
 123       Assert.that((level == 0) || (level == 1), "Index " + level +
 124                   " out of range (should be 0 or 1)");
 125     }
 126 
 127     if ((level != 0) && (level != 1)) {
 128       return null;
 129     }
 130 
 131     if (level == 0) {
 132       return (GenerationSpec)
 133               VMObjectFactory.newObject(GenerationSpec.class,
 134                       youngGenSpecField.getAddress());
 135     } else {
 136       return (GenerationSpec)
 137               VMObjectFactory.newObject(GenerationSpec.class,
 138                       oldGenSpecField.getAddress());
 139     }
 140   }
 141 
 142   public CollectedHeapName kind() {
 143     return CollectedHeapName.GEN_COLLECTED_HEAP;
 144   }
 145 
 146   public void printOn(PrintStream tty) {
 147     for (int i = 0; i < nGens(); i++) {
 148       tty.print("Gen " + i + ": ");
 149       getGen(i).printOn(tty);
 150       tty.println("Invocations: " + getGen(i).invocations());
 151       tty.println();
 152     }
 153   }
 154 }