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 sun.jvm.hotspot.debugger.Address;
  28 import sun.jvm.hotspot.runtime.VM;
  29 import sun.jvm.hotspot.runtime.VMObject;
  30 import sun.jvm.hotspot.types.AddressField;
  31 import sun.jvm.hotspot.types.Type;
  32 import sun.jvm.hotspot.types.TypeDataBase;
  33 
  34 class ZGlobalsForVMStructs extends VMObject {
  35     private static AddressField ZGlobalPhaseField;
  36     private static AddressField ZAddressGoodMaskField;
  37     private static AddressField ZAddressBadMaskField;
  38     private static AddressField ZAddressWeakBadMaskField;
  39     private static AddressField ZObjectAlignmentSmallShiftField;
  40     private static AddressField ZObjectAlignmentSmallField;
  41 
  42     static {
  43         VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
  44     }
  45 
  46     static private synchronized void initialize(TypeDataBase db) {
  47         Type type = db.lookupType("ZGlobalsForVMStructs");
  48 
  49         ZGlobalPhaseField = type.getAddressField("_ZGlobalPhase");
  50         ZAddressGoodMaskField = type.getAddressField("_ZAddressGoodMask");
  51         ZAddressBadMaskField = type.getAddressField("_ZAddressBadMask");
  52         ZAddressWeakBadMaskField = type.getAddressField("_ZAddressWeakBadMask");
  53         ZObjectAlignmentSmallShiftField = type.getAddressField("_ZObjectAlignmentSmallShift");
  54         ZObjectAlignmentSmallField = type.getAddressField("_ZObjectAlignmentSmall");
  55     }
  56 
  57     ZGlobalsForVMStructs(Address addr) {
  58         super(addr);
  59     }
  60 
  61     int ZGlobalPhase() {
  62         return ZGlobalPhaseField.getValue(addr).getJIntAt(0);
  63     }
  64 
  65     long ZAddressGoodMask() {
  66         return ZAddressGoodMaskField.getValue(addr).getJLongAt(0);
  67     }
  68 
  69     long ZAddressBadMask() {
  70         return ZAddressBadMaskField.getValue(addr).getJLongAt(0);
  71     }
  72 
  73     long ZAddressWeakBadMask() {
  74         return ZAddressWeakBadMaskField.getValue(addr).getJLongAt(0);
  75     }
  76 
  77     int ZObjectAlignmentSmallShift() {
  78         return ZObjectAlignmentSmallShiftField.getValue(addr).getJIntAt(0);
  79     }
  80 
  81     int ZObjectAlignmentSmall() {
  82         return ZObjectAlignmentSmallField.getValue(addr).getJIntAt(0);
  83     }
  84 }