1 /*
   2  * Copyright (c) 2017, 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.io.PrintStream;
  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 // Mirror class for ZHeap
  37 
  38 public class ZHeap extends VMObject {
  39 
  40     private static long pageAllocatorFieldOffset;
  41     private static long pageTableFieldOffset;
  42 
  43     static {
  44         VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
  45     }
  46 
  47     private static synchronized void initialize(TypeDataBase db) {
  48         Type type = db.lookupType("ZHeap");
  49 
  50         pageAllocatorFieldOffset = type.getAddressField("_page_allocator").getOffset();
  51         pageTableFieldOffset = type.getAddressField("_pagetable").getOffset();
  52     }
  53 
  54     public ZHeap(Address addr) {
  55         super(addr);
  56     }
  57 
  58     private ZPageAllocator pageAllocator() {
  59         Address pageAllocatorAddr = addr.addOffsetTo(pageAllocatorFieldOffset);
  60         return (ZPageAllocator)VMObjectFactory.newObject(ZPageAllocator.class, pageAllocatorAddr);
  61     }
  62 
  63     public ZPageTable pageTable() {
  64         return (ZPageTable)VMObjectFactory.newObject(ZPageTable.class, addr.addOffsetTo(pageTableFieldOffset));
  65     }
  66 
  67     public long maxCapacity() {
  68         return pageAllocator().maxCapacity();
  69     }
  70 
  71     public long capacity() {
  72         return pageAllocator().capacity();
  73     }
  74 
  75     public long used() {
  76         return pageAllocator().used();
  77     }
  78 
  79     boolean is_relocating(Address o) {
  80         return pageTable().is_relocating(o);
  81     }
  82 
  83     Address forward_object(Address addr) {
  84         ZPage page = pageTable().get(addr);
  85         return page.forward_object(addr);
  86     }
  87 
  88     Address relocate_object(Address addr) {
  89         ZPage page = pageTable().get(addr);
  90         return page.relocate_object(addr);
  91     }
  92 
  93     public void printOn(PrintStream tty) {
  94         tty.print(" ZHeap          ");
  95         tty.print("used " + (used() / 1024 / 1024) + "M, ");
  96         tty.print("capacity " + (capacity() / 1024 / 1024) + "M, ");
  97         tty.println("max capacity " + (maxCapacity() / 1024 / 1024) + "M");
  98     }
  99 }
--- EOF ---