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     static {
  36         VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
  37     }
  38 
  39     static private synchronized void initialize(TypeDataBase db) {
  40         Type type = db.lookupType("ZGlobalsForVMStructs");
  41 
  42         instanceField = type.getField("_instance_p");
  43     }
  44 
  45     private static ZGlobalsForVMStructs instance() {
  46         return new ZGlobalsForVMStructs(instanceField.getAddress());
  47     }
  48 
  49     public static int ZGlobalPhase() {
  50         return instance().ZGlobalPhase();
  51     }
  52 
  53     public static long ZAddressGoodMask() {
  54         return instance().ZAddressGoodMask();
  55     }
  56 
  57     public static long ZAddressBadMask() {
  58         return instance().ZAddressBadMask();
  59     }
  60 
  61     public static long ZAddressWeakBadMask() {
  62         return instance().ZAddressWeakBadMask();
  63     }
  64 
  65     public static int ZObjectAlignmentSmallShift() {
  66         return instance().ZObjectAlignmentSmallShift();
  67     }
  68 
  69     public static int ZObjectAlignmentSmall() {
  70         return instance().ZObjectAlignmentSmall();
  71     }
  72 
  73     public static final int ZPhaseMark                    = 0;
  74     public static final int ZPhaseMarkCompleted           = 1;
  75     public static final int ZPhaseRelocate                = 2;
  76 
  77     public static final byte ZPageTypeSmall                = 0;
  78     public static final byte ZPageTypeMedium               = 1;
  79     public static final byte ZPageTypeLarge                = 2;
  80 
  81     // TODO: Only LINUX for now
  82     public static final int  ZPlatformPageSizeSmallShift   = 21;
  83     public static final long ZPlatformAddressOffsetBits    = 42; // 4TB
  84     public static final long ZPlatformAddressMetadataShift = ZPlatformAddressOffsetBits;
  85 
  86 
  87     // Page size shifts
  88     public static final int  ZPageSizeSmallShift           = ZPlatformPageSizeSmallShift;
  89     public static final int  ZPageSizeMediumShift          = ZPageSizeSmallShift + 4;
  90     public static final int  ZPageSizeMinShift             = ZPageSizeSmallShift;
  91 
  92     public static final int  ZObjectAlignmentMediumShift   = ZPageSizeMediumShift - 13; // 8192 objects per page
  93     public static final int  ZObjectAlignmentLargeShift    = ZPageSizeSmallShift;
  94 
  95     public static final int  ZObjectAlignmentMedium        = 1 << ZObjectAlignmentMediumShift;
  96     public static final int  ZObjectAlignmentLarge         = 1 << ZObjectAlignmentLargeShift;
  97 
  98     // Metadata part of address
  99     public static final long ZAddressMetadataShift         = ZPlatformAddressMetadataShift;
 100     public static final long ZAddressMetadataBits          = 4;
 101     public static final long ZAddressMetadataMask          = ((1L << ZAddressMetadataBits) - 1) << ZAddressMetadataShift;
 102 
 103     public static final long ZAddressOffsetShift           = 0;
 104     public static final long ZAddressOffsetBits            = ZPlatformAddressOffsetBits;
 105     public static final long ZAddressOffsetMask            = ((1L << ZAddressOffsetBits) - 1) << ZAddressOffsetShift;
 106 
 107     public static final long ZMarked0                      = 0x0000040000000000L;
 108     public static final long ZMarked1                      = 0x0000080000000000L;
 109     public static final long ZRemapped                     = 0x0000100000000000L;
 110 };