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.runtime.VM;
  28 import sun.jvm.hotspot.types.Field;
  29 import sun.jvm.hotspot.types.Type;
  30 import sun.jvm.hotspot.types.TypeDataBase;
  31 
  32 public class ZGlobals {
  33     private static Field instanceField;
  34 
  35     // Global phase state
  36     public static int ZPhaseRelocate;
  37 
  38     public static byte ZPageTypeSmall;
  39     public static byte ZPageTypeMedium;
  40     public static byte ZPageTypeLarge;
  41 
  42     // Page size shifts
  43     public static long ZPageSizeSmallShift;
  44     public static long ZPageSizeMediumShift;
  45     public static long ZPageSizeMinShift;
  46 
  47     // Object alignment shifts
  48     public static int  ZObjectAlignmentMediumShift;
  49     public static int  ZObjectAlignmentLargeShift;
  50 
  51     // Pointer part of address
  52     public static long ZAddressOffsetShift;
  53 
  54     // Pointer part of address
  55     public static long ZAddressOffsetBits;
  56     public static long ZAddressOffsetMask;

  57 
  58     // Address space start/end/size
  59     public static long ZAddressSpaceStart;
  60 
  61     static {
  62         VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
  63     }
  64 
  65     static private synchronized void initialize(TypeDataBase db) {
  66         Type type = db.lookupType("ZGlobalsForVMStructs");
  67 
  68         instanceField = type.getField("_instance_p");
  69 
  70         ZPhaseRelocate = db.lookupIntConstant("ZPhaseRelocate").intValue();
  71 
  72         ZPageTypeSmall = db.lookupIntConstant("ZPageTypeSmall").byteValue();
  73         ZPageTypeMedium = db.lookupIntConstant("ZPageTypeMedium").byteValue();
  74         ZPageTypeLarge = db.lookupIntConstant("ZPageTypeLarge").byteValue();
  75 
  76         ZPageSizeSmallShift = db.lookupLongConstant("ZPageSizeSmallShift").longValue();
  77         ZPageSizeMediumShift = db.lookupLongConstant("ZPageSizeMediumShift").longValue();
  78         ZPageSizeMinShift = db.lookupLongConstant("ZPageSizeMinShift").longValue();
  79 
  80         ZObjectAlignmentMediumShift = db.lookupIntConstant("ZObjectAlignmentMediumShift").intValue();
  81         ZObjectAlignmentLargeShift = db.lookupIntConstant("ZObjectAlignmentLargeShift").intValue();;
  82 
  83         ZAddressOffsetShift = db.lookupLongConstant("ZAddressOffsetShift").longValue();
  84 
  85         ZAddressOffsetBits = db.lookupLongConstant("ZAddressOffsetBits").longValue();
  86         ZAddressOffsetMask = db.lookupLongConstant("ZAddressOffsetMask").longValue();

  87 
  88         ZAddressSpaceStart = db.lookupLongConstant("ZAddressSpaceStart").longValue();

  89     }
  90 
  91     private static ZGlobalsForVMStructs instance() {
  92         return new ZGlobalsForVMStructs(instanceField.getAddress());
  93     }
  94 
  95     public static int ZGlobalPhase() {
  96         return instance().ZGlobalPhase();
  97     }
  98 
  99     public static long ZAddressGoodMask() {
 100         return instance().ZAddressGoodMask();
 101     }
 102 
 103     public static long ZAddressBadMask() {
 104         return instance().ZAddressBadMask();
 105     }
 106 
 107     public static long ZAddressWeakBadMask() {
 108         return instance().ZAddressWeakBadMask();
 109     }
 110 
 111     public static int ZObjectAlignmentSmallShift() {
 112         return instance().ZObjectAlignmentSmallShift();
 113     }
 114 
 115     public static int ZObjectAlignmentSmall() {
 116         return instance().ZObjectAlignmentSmall();
 117     }
 118 }
--- EOF ---