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 long gensOffset;

  39   private static AddressField genSpecsField;
  40 
  41   private static GenerationFactory genFactory;
  42 
  43   static {
  44     VM.registerVMInitializedObserver(new Observer() {
  45         public void update(Observable o, Object data) {
  46           initialize(VM.getVM().getTypeDataBase());
  47         }
  48       });
  49   }
  50 
  51   private static synchronized void initialize(TypeDataBase db) {
  52     Type type = db.lookupType("GenCollectedHeap");
  53 
  54     nGensField = type.getCIntegerField("_n_gens");
  55     gensOffset = type.getField("_gens").getOffset();

  56     genSpecsField = type.getAddressField("_gen_specs");
  57 
  58     genFactory = new GenerationFactory();
  59   }
  60 
  61   public GenCollectedHeap(Address addr) {
  62     super(addr);
  63   }
  64 
  65   public int nGens() {
  66     return (int) nGensField.getValue(addr);
  67   }
  68 
  69   public Generation getGen(int i) {
  70     if (Assert.ASSERTS_ENABLED) {
  71       Assert.that((i >= 0) && (i < nGens()), "Index " + i +
  72                   " out of range (should be between 0 and " + nGens() + ")");
  73     }
  74 
  75     if ((i < 0) || (i >= nGens())) {
  76       return null;
  77     }
  78 
  79     Address genAddr = addr.getAddressAt(gensOffset +
  80                                         (i * VM.getVM().getAddressSize()));
  81     return genFactory.newObject(addr.getAddressAt(gensOffset +
  82                                                   (i * VM.getVM().getAddressSize())));

  83   }
  84 
  85   public boolean isIn(Address a) {
  86     for (int i = 0; i < nGens(); i++) {
  87       Generation gen = getGen(i);
  88       if (gen.isIn(a)) {
  89         return true;
  90       }
  91     }
  92 
  93     return false;
  94   }
  95 
  96   public long capacity() {
  97     long capacity = 0;
  98     for (int i = 0; i < nGens(); i++) {
  99       capacity += getGen(i).capacity();
 100     }
 101     return capacity;
 102   }
 103 
 104   public long used() {
 105     long used = 0;
 106     for (int i = 0; i < nGens(); i++) {
 107       used += getGen(i).used();
 108     }
 109     return used;
 110   }
 111 
 112   /** Package-private access to GenerationSpecs */
 113   GenerationSpec spec(int level) {
 114     if (Assert.ASSERTS_ENABLED) {
 115       Assert.that((level >= 0) && (level < nGens()), "Index " + level +
 116                   " out of range (should be between 0 and " + nGens() + ")");
 117     }
 118 
 119     if ((level < 0) || (level >= nGens())) {
 120       return null;
 121     }
 122 
 123     Address ptrList = genSpecsField.getValue(addr);
 124     if (ptrList == null) {
 125       return null;
 126     }
 127     return (GenerationSpec)
 128       VMObjectFactory.newObject(GenerationSpec.class,
 129                                 ptrList.getAddressAt(level * VM.getVM().getAddressSize()));
 130   }
 131 
 132   public CollectedHeapName kind() {
 133     return CollectedHeapName.GEN_COLLECTED_HEAP;
 134   }
 135 
 136   public void printOn(PrintStream tty) {
 137     for (int i = 0; i < nGens(); i++) {
 138       tty.print("Gen " + i + ": ");
 139       getGen(i).printOn(tty);
 140       tty.println("Invocations: " + getGen(i).invocations());
 141       tty.println();
 142     }
 143   }
 144 }
--- EOF ---