1 /*
   2  * Copyright (c) 2011, 2017, 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.g1;
  26 
  27 import java.io.PrintStream;
  28 import java.util.Iterator;
  29 import java.util.Observable;
  30 import java.util.Observer;
  31 
  32 import sun.jvm.hotspot.debugger.Address;
  33 import sun.jvm.hotspot.gc.shared.CollectedHeap;
  34 import sun.jvm.hotspot.gc.shared.CollectedHeapName;
  35 import sun.jvm.hotspot.gc.shared.SpaceClosure;
  36 import sun.jvm.hotspot.memory.MemRegion;
  37 import sun.jvm.hotspot.runtime.VM;
  38 import sun.jvm.hotspot.runtime.VMObjectFactory;
  39 import sun.jvm.hotspot.types.AddressField;
  40 import sun.jvm.hotspot.types.CIntegerField;
  41 import sun.jvm.hotspot.types.Type;
  42 import sun.jvm.hotspot.types.TypeDataBase;
  43 
  44 // Mirror class for G1CollectedHeap.
  45 
  46 public class G1CollectedHeap extends CollectedHeap {
  47     // HeapRegionManager _hrm;
  48     static private long hrmFieldOffset;
  49     // MemRegion _g1_reserved;
  50     static private long g1ReservedFieldOffset;
  51     // size_t _summary_bytes_used;
  52     static private CIntegerField summaryBytesUsedField;
  53     // G1MonitoringSupport* _g1mm;
  54     static private AddressField g1mmField;
  55     // HeapRegionSet _old_set;
  56     static private long oldSetFieldOffset;
  57     // HeapRegionSet _humongous_set;
  58     static private long humongousSetFieldOffset;
  59 
  60     static {
  61         VM.registerVMInitializedObserver(new Observer() {
  62                 public void update(Observable o, Object data) {
  63                     initialize(VM.getVM().getTypeDataBase());
  64                 }
  65             });
  66     }
  67 
  68     static private synchronized void initialize(TypeDataBase db) {
  69         Type type = db.lookupType("G1CollectedHeap");
  70 
  71         hrmFieldOffset = type.getField("_hrm").getOffset();
  72         summaryBytesUsedField = type.getCIntegerField("_summary_bytes_used");
  73         g1mmField = type.getAddressField("_g1mm");
  74         oldSetFieldOffset = type.getField("_old_set").getOffset();
  75         humongousSetFieldOffset = type.getField("_humongous_set").getOffset();
  76     }
  77 
  78     public long capacity() {
  79         return hrm().capacity();
  80     }
  81 
  82     public long used() {
  83         return summaryBytesUsedField.getValue(addr);
  84     }
  85 
  86     public long n_regions() {
  87         return hrm().length();
  88     }
  89 
  90     public HeapRegionManager hrm() {
  91         Address hrmAddr = addr.addOffsetTo(hrmFieldOffset);
  92         return (HeapRegionManager) VMObjectFactory.newObject(HeapRegionManager.class,
  93                                                          hrmAddr);
  94     }
  95 
  96     public G1MonitoringSupport g1mm() {
  97         Address g1mmAddr = g1mmField.getValue(addr);
  98         return (G1MonitoringSupport) VMObjectFactory.newObject(G1MonitoringSupport.class, g1mmAddr);
  99     }
 100 
 101     public HeapRegionSetBase oldSet() {
 102         Address oldSetAddr = addr.addOffsetTo(oldSetFieldOffset);
 103         return (HeapRegionSetBase) VMObjectFactory.newObject(HeapRegionSetBase.class,
 104                                                              oldSetAddr);
 105     }
 106 
 107     public HeapRegionSetBase humongousSet() {
 108         Address humongousSetAddr = addr.addOffsetTo(humongousSetFieldOffset);
 109         return (HeapRegionSetBase) VMObjectFactory.newObject(HeapRegionSetBase.class,
 110                                                              humongousSetAddr);
 111     }
 112 
 113     private Iterator<HeapRegion> heapRegionIterator() {
 114         return hrm().heapRegionIterator();
 115     }
 116 
 117     public void heapRegionIterate(SpaceClosure scl) {
 118         Iterator<HeapRegion> iter = heapRegionIterator();
 119         while (iter.hasNext()) {
 120             HeapRegion hr = iter.next();
 121             scl.doSpace(hr);
 122         }
 123     }
 124 
 125     public CollectedHeapName kind() {
 126         return CollectedHeapName.G1_COLLECTED_HEAP;
 127     }
 128 
 129     @Override
 130     public void printOn(PrintStream tty) {
 131         MemRegion mr = reservedRegion();
 132 
 133         tty.print("garbage-first heap");
 134         tty.print(" [" + mr.start() + ", " + mr.end() + "]");
 135         tty.println(" region size " + (HeapRegion.grainBytes() / 1024) + "K");
 136     }
 137 
 138     public G1CollectedHeap(Address addr) {
 139         super(addr);
 140     }
 141 }