1 /*
   2  * Copyright (c) 2018, 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 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     // Granule size shift
  43     public static long ZGranuleSizeShift;
  44 
  45     // Page size shifts
  46     public static long ZPageSizeSmallShift;
  47     public static long ZPageSizeMediumShift;
  48 
  49     // Object alignment shifts
  50     public static int  ZObjectAlignmentMediumShift;
  51     public static int  ZObjectAlignmentLargeShift;
  52 
  53     // Pointer part of address
  54     public static long ZAddressOffsetShift;
  55 
  56     // Pointer part of address
  57     public static long ZAddressOffsetBits;
  58     public static long ZAddressOffsetMask;
  59     public static long ZAddressOffsetMax;
  60 
  61     // Address space start/end/size
  62     public static long ZAddressSpaceStart;
  63 
  64     static {
  65         VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
  66     }
  67 
  68     static private synchronized void initialize(TypeDataBase db) {
  69         Type type = db.lookupType("ZGlobalsForVMStructs");
  70 
  71         instanceField = type.getField("_instance_p");
  72 
  73         ZPhaseRelocate = db.lookupIntConstant("ZPhaseRelocate").intValue();
  74 
  75         ZPageTypeSmall = db.lookupIntConstant("ZPageTypeSmall").byteValue();
  76         ZPageTypeMedium = db.lookupIntConstant("ZPageTypeMedium").byteValue();
  77         ZPageTypeLarge = db.lookupIntConstant("ZPageTypeLarge").byteValue();
  78 
  79         ZGranuleSizeShift = db.lookupLongConstant("ZGranuleSizeShift").longValue();
  80 
  81         ZPageSizeSmallShift = db.lookupLongConstant("ZPageSizeSmallShift").longValue();
  82         ZPageSizeMediumShift = db.lookupLongConstant("ZPageSizeMediumShift").longValue();
  83 
  84         ZObjectAlignmentMediumShift = db.lookupIntConstant("ZObjectAlignmentMediumShift").intValue();
  85         ZObjectAlignmentLargeShift = db.lookupIntConstant("ZObjectAlignmentLargeShift").intValue();;
  86 
  87         ZAddressOffsetShift = db.lookupLongConstant("ZAddressOffsetShift").longValue();
  88 
  89         ZAddressOffsetBits = db.lookupLongConstant("ZAddressOffsetBits").longValue();
  90         ZAddressOffsetMask = db.lookupLongConstant("ZAddressOffsetMask").longValue();
  91         ZAddressOffsetMax  = db.lookupLongConstant("ZAddressOffsetMax").longValue();
  92 
  93         ZAddressSpaceStart = db.lookupLongConstant("ZAddressSpaceStart").longValue();
  94     }
  95 
  96     private static ZGlobalsForVMStructs instance() {
  97         return new ZGlobalsForVMStructs(instanceField.getAddress());
  98     }
  99 
 100     public static int ZGlobalPhase() {
 101         return instance().ZGlobalPhase();
 102     }
 103 
 104     public static int ZGlobalSeqNum() {
 105         return instance().ZGlobalSeqNum();
 106     }
 107 
 108     public static long ZAddressGoodMask() {
 109         return instance().ZAddressGoodMask();
 110     }
 111 
 112     public static long ZAddressBadMask() {
 113         return instance().ZAddressBadMask();
 114     }
 115 
 116     public static long ZAddressWeakBadMask() {
 117         return instance().ZAddressWeakBadMask();
 118     }
 119 
 120     public static int ZObjectAlignmentSmallShift() {
 121         return instance().ZObjectAlignmentSmallShift();
 122     }
 123 
 124     public static int ZObjectAlignmentSmall() {
 125         return instance().ZObjectAlignmentSmall();
 126     }
 127 }