1 /*
   2  * Copyright (c) 2017, 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.z;
  26 
  27 import java.io.PrintStream;
  28 
  29 import sun.jvm.hotspot.debugger.Address;
  30 import sun.jvm.hotspot.debugger.OopHandle;
  31 import sun.jvm.hotspot.gc.shared.CollectedHeap;
  32 import sun.jvm.hotspot.gc.shared.CollectedHeapName;
  33 import sun.jvm.hotspot.gc.shared.LiveRegionsClosure;
  34 import sun.jvm.hotspot.runtime.VM;
  35 import sun.jvm.hotspot.runtime.VMObjectFactory;
  36 import sun.jvm.hotspot.types.Type;
  37 import sun.jvm.hotspot.types.TypeDataBase;
  38 import sun.jvm.hotspot.utilities.BitMapInterface;
  39 
  40 // Mirror class for ZCollectedHeap.
  41 
  42 public class ZCollectedHeap extends CollectedHeap {
  43     private static long zHeapFieldOffset;
  44 
  45     static {
  46         VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
  47     }
  48 
  49     private static synchronized void initialize(TypeDataBase db) {
  50         Type type = db.lookupType("ZCollectedHeap");
  51 
  52         zHeapFieldOffset = type.getAddressField("_heap").getOffset();
  53     }
  54 
  55     public ZHeap heap() {
  56         Address heapAddr = addr.addOffsetTo(zHeapFieldOffset);
  57         return (ZHeap)VMObjectFactory.newObject(ZHeap.class, heapAddr);
  58     }
  59 
  60     @Override
  61     public CollectedHeapName kind() {
  62         return CollectedHeapName.Z;
  63     }
  64 
  65     @Override
  66     public void printOn(PrintStream tty) {
  67         heap().printOn(tty);
  68     }
  69 
  70     public ZCollectedHeap(Address addr) {
  71         super(addr);
  72     }
  73 
  74     @Override
  75     public long capacity() {
  76         return heap().capacity();
  77     }
  78 
  79     @Override
  80     public long used() {
  81         return heap().used();
  82     }
  83 
  84 
  85 
  86     private OopHandle oop_load_barrier(Address oopAddress) {
  87         oopAddress = ZBarrier.weak_barrier(oopAddress);
  88         if (oopAddress == null) {
  89             return null;
  90         }
  91 
  92         return oopAddress.addOffsetToAsOopHandle(0);
  93     }
  94 
  95     @Override
  96     public OopHandle oop_load_at(OopHandle handle, long offset) {
  97         assert(!VM.getVM().isCompressedOopsEnabled());
  98 
  99         Address oopAddress = handle.getAddressAt(offset);
 100 
 101         return oop_load_barrier(oopAddress);
 102     }
 103 
 104     // addr can be either in heap or in native
 105     @Override
 106     public OopHandle oop_load_in_native(Address addr) {
 107         Address oopAddress = addr.getAddressAt(0);
 108 
 109         return oop_load_barrier(oopAddress);
 110     }
 111 
 112     public String oopAddressDescription(OopHandle handle) {
 113         Address origOop = ZOop.to_address(handle);
 114         Address loadBarrieredOop = ZBarrier.weak_barrier(origOop);
 115         if (!origOop.equals(loadBarrieredOop)) {
 116             return origOop + " (" + loadBarrieredOop.toString() + ")";
 117         } else {
 118             return handle.toString();
 119         }
 120     }
 121 
 122     @Override
 123     public void liveRegionsIterate(LiveRegionsClosure closure) {
 124         // Operation (currently) not supported with ZGC. Print
 125         // a warning and leave the list of live regions empty.
 126         System.err.println("Warning: Operation not supported with ZGC");
 127     }
 128 
 129     @Override
 130     public BitMapInterface createBitMap(long size) {
 131         // Ignores the size
 132         return new ZExternalBitMap(this);
 133     }
 134 }