1 /*
   2  * Copyright (c) 2018, 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.util.function.Consumer;
  28 
  29 import sun.jvm.hotspot.debugger.Address;
  30 import sun.jvm.hotspot.runtime.VM;
  31 import sun.jvm.hotspot.runtime.VMObject;
  32 import sun.jvm.hotspot.runtime.VMObjectFactory;
  33 import sun.jvm.hotspot.types.Type;
  34 import sun.jvm.hotspot.types.TypeDataBase;
  35 
  36 public class ZPageTable extends VMObject {
  37     private static long mapFieldOffset;
  38 
  39     static {
  40         VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
  41     }
  42 
  43     static private synchronized void initialize(TypeDataBase db) {
  44         Type type = db.lookupType("ZPageTable");
  45 
  46         mapFieldOffset = type.getAddressField("_map").getOffset();
  47     }
  48 
  49     public ZPageTable(Address addr) {
  50         super(addr);
  51     }
  52 
  53     private ZAddressRangeMapForPageTable map() {
  54         return (ZAddressRangeMapForPageTable)VMObjectFactory.newObject(ZAddressRangeMapForPageTable.class, addr.addOffsetTo(mapFieldOffset));
  55     }
  56 
  57     private ZPageTableEntry getEntry(Address o) {
  58         return new ZPageTableEntry(map().get(o));
  59     }
  60 
  61     private ZPageTableEntry getEntry(long index) {
  62         return new ZPageTableEntry(map().get(index));
  63     }
  64 
  65     ZPage get(Address o) {
  66         return getEntry(o).page();
  67     }
  68 
  69     boolean is_relocating(Address o) {
  70         return getEntry(o).relocating();
  71     }
  72 
  73     public void pageTableIterate(Consumer<ZPage> consumer) {
  74         ZPage prev = null;
  75         for (long index = 0L; index < map().size(); index++) {
  76             var pageEntry = getEntry(index);
  77             if (pageEntry.entry != null) {
  78                 var page = pageEntry.page();
  79                 if (!page.equals(prev)) {
  80                     consumer.accept(page);
  81                     prev = page;
  82                 }
  83             }
  84         }
  85     }
  86 }
--- EOF ---