1 /*
   2  * Copyright (c) 2011, 2019, 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.LiveRegionsClosure;
  36 import sun.jvm.hotspot.gc.shared.PrintRegionClosure;
  37 import sun.jvm.hotspot.gc.shared.SpaceClosure;
  38 import sun.jvm.hotspot.memory.MemRegion;
  39 import sun.jvm.hotspot.runtime.VM;
  40 import sun.jvm.hotspot.runtime.VMObjectFactory;
  41 import sun.jvm.hotspot.types.AddressField;
  42 import sun.jvm.hotspot.types.CIntegerField;
  43 import sun.jvm.hotspot.types.Type;
  44 import sun.jvm.hotspot.types.TypeDataBase;
  45 import sun.jvm.hotspot.tools.HeapSummary;
  46 
  47 // Mirror class for G1CollectedHeap.
  48 
  49 public class G1CollectedHeap extends CollectedHeap {
  50     // HeapRegionManager _hrm;
  51     static private AddressField hrmField;
  52     // MemRegion _g1_reserved;
  53     static private long g1ReservedFieldOffset;
  54     // size_t _summary_bytes_used;
  55     static private CIntegerField summaryBytesUsedField;
  56     // G1MonitoringSupport* _g1mm;
  57     static private AddressField g1mmField;
  58     // HeapRegionSet _old_set;
  59     static private long oldSetFieldOffset;
  60     // HeapRegionSet _archive_set;
  61     static private long archiveSetFieldOffset;
  62     // HeapRegionSet _humongous_set;
  63     static private long humongousSetFieldOffset;
  64 
  65     static {
  66         VM.registerVMInitializedObserver(new Observer() {
  67                 public void update(Observable o, Object data) {
  68                     initialize(VM.getVM().getTypeDataBase());
  69                 }
  70             });
  71     }
  72 
  73     static private synchronized void initialize(TypeDataBase db) {
  74         Type type = db.lookupType("G1CollectedHeap");
  75 
  76         hrmField = type.getAddressField("_hrm");
  77         summaryBytesUsedField = type.getCIntegerField("_summary_bytes_used");
  78         g1mmField = type.getAddressField("_g1mm");
  79         oldSetFieldOffset = type.getField("_old_set").getOffset();
  80         archiveSetFieldOffset = type.getField("_archive_set").getOffset();
  81         humongousSetFieldOffset = type.getField("_humongous_set").getOffset();
  82     }
  83 
  84     public long capacity() {
  85         return hrm().capacity();
  86     }
  87 
  88     public long used() {
  89         return summaryBytesUsedField.getValue(addr);
  90     }
  91 
  92     public long n_regions() {
  93         return hrm().length();
  94     }
  95 
  96     public HeapRegionManager hrm() {
  97         Address hrmAddr = hrmField.getValue(addr);
  98         return (HeapRegionManager) VMObjectFactory.newObject(HeapRegionManager.class,
  99                                                          hrmAddr);
 100     }
 101 
 102     public G1MonitoringSupport g1mm() {
 103         Address g1mmAddr = g1mmField.getValue(addr);
 104         return (G1MonitoringSupport) VMObjectFactory.newObject(G1MonitoringSupport.class, g1mmAddr);
 105     }
 106 
 107     public HeapRegionSetBase oldSet() {
 108         Address oldSetAddr = addr.addOffsetTo(oldSetFieldOffset);
 109         return (HeapRegionSetBase) VMObjectFactory.newObject(HeapRegionSetBase.class,
 110                                                              oldSetAddr);
 111     }
 112 
 113     public HeapRegionSetBase archiveSet() {
 114         Address archiveSetAddr = addr.addOffsetTo(archiveSetFieldOffset);
 115         return (HeapRegionSetBase) VMObjectFactory.newObject(HeapRegionSetBase.class,
 116                                                              archiveSetAddr);
 117     }
 118 
 119     public HeapRegionSetBase humongousSet() {
 120         Address humongousSetAddr = addr.addOffsetTo(humongousSetFieldOffset);
 121         return (HeapRegionSetBase) VMObjectFactory.newObject(HeapRegionSetBase.class,
 122                                                              humongousSetAddr);
 123     }
 124 
 125     private Iterator<HeapRegion> heapRegionIterator() {
 126         return hrm().heapRegionIterator();
 127     }
 128 
 129     public void heapRegionIterate(SpaceClosure scl) {
 130         Iterator<HeapRegion> iter = heapRegionIterator();
 131         while (iter.hasNext()) {
 132             HeapRegion hr = iter.next();
 133             scl.doSpace(hr);
 134         }
 135     }
 136 
 137     public CollectedHeapName kind() {
 138         return CollectedHeapName.G1;
 139     }
 140 
 141     @Override
 142     public void liveRegionsIterate(LiveRegionsClosure closure) {
 143         Iterator<HeapRegion> iter = heapRegionIterator();
 144         while (iter.hasNext()) {
 145             HeapRegion hr = iter.next();
 146             closure.doLiveRegions(hr);
 147         }
 148     }
 149 
 150     @Override
 151     public void printOn(PrintStream tty) {
 152         MemRegion mr = reservedRegion();
 153 
 154         tty.print("garbage-first heap");
 155         tty.print(" [" + mr.start() + ", " + mr.end() + "]");
 156         tty.println(" region size " + (HeapRegion.grainBytes() / 1024) + "K");
 157 
 158         HeapSummary sum = new HeapSummary();
 159         sum.printG1HeapSummary(this);
 160     }
 161 
 162     public void printRegionDetails(PrintStream tty) {
 163         PrintRegionClosure prc = new PrintRegionClosure(tty);
 164         heapRegionIterate(prc);
 165     }
 166 
 167     public G1CollectedHeap(Address addr) {
 168         super(addr);
 169     }
 170 }