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.types.Field;
  30 import sun.jvm.hotspot.types.Type;
  31 import sun.jvm.hotspot.types.TypeDataBase;
  32 
  33 public class ZGlobals {
  34     private static Field instanceField;
  35 
  36     // Global phase state
  37     public static int ZPhaseRelocate;
  38 
  39     public static byte ZPageTypeSmall;
  40     public static byte ZPageTypeMedium;
  41     public static byte ZPageTypeLarge;
  42 
  43     // Page size shifts
  44     public static long ZPageSizeSmallShift;
  45     public static long ZPageSizeMediumShift;
  46     public static long ZPageSizeMinShift;
  47 
  48     // Object alignment shifts
  49     public static int  ZObjectAlignmentMediumShift;
  50     public static int  ZObjectAlignmentLargeShift;
  51 
  52     // Pointer part of address
  53     public static long ZAddressOffsetShift;
  54 
  55     // Pointer part of address
  56     public static long ZAddressOffsetBits;
  57     public static long ZAddressOffsetMask;
  58     public static long ZAddressOffsetMax;
  59 
  60     // Address space start/end/size
  61     public static Address ZAddressSpaceStart;
  62 
  63     static {
  64         VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
  65     }
  66 
  67     static private synchronized void initialize(TypeDataBase db) {
  68         Type type = db.lookupType("ZGlobalsForVMStructs");
  69 
  70         instanceField = type.getField("_instance_p");
  71 
  72         ZPhaseRelocate = db.lookupIntConstant("ZPhaseRelocate").intValue();
  73 
  74         ZPageTypeSmall = db.lookupIntConstant("ZPageTypeSmall").byteValue();
  75         ZPageTypeMedium = db.lookupIntConstant("ZPageTypeMedium").byteValue();
  76         ZPageTypeLarge = db.lookupIntConstant("ZPageTypeLarge").byteValue();
  77 
  78         ZPageSizeSmallShift = db.lookupLongConstant("ZPageSizeSmallShift").longValue();
  79         ZPageSizeMediumShift = db.lookupLongConstant("ZPageSizeMediumShift").longValue();
  80         ZPageSizeMinShift = db.lookupLongConstant("ZPageSizeMinShift").longValue();
  81 
  82         ZObjectAlignmentMediumShift = db.lookupIntConstant("ZObjectAlignmentMediumShift").intValue();
  83         ZObjectAlignmentLargeShift = db.lookupIntConstant("ZObjectAlignmentLargeShift").intValue();;
  84 
  85         ZAddressOffsetShift = db.lookupLongConstant("ZAddressOffsetShift").longValue();
  86 
  87         ZAddressOffsetBits = db.lookupLongConstant("ZAddressOffsetBits").longValue();
  88         ZAddressOffsetMask = db.lookupLongConstant("ZAddressOffsetMask").longValue();
  89         ZAddressOffsetMax = db.lookupLongConstant("ZAddressOffsetMax").longValue();
  90 
  91         ZAddressSpaceStart = VM.getVM().getDebugger().parseAddress(
  92             "0x" + Long.toUnsignedString(db.lookupLongConstant("ZAddressSpaceStart").longValue(), 16));
  93     }
  94 
  95     private static ZGlobalsForVMStructs instance() {
  96         return new ZGlobalsForVMStructs(instanceField.getAddress());
  97     }
  98 
  99     public static int ZGlobalPhase() {
 100         return instance().ZGlobalPhase();
 101     }
 102 
 103     public static long ZAddressGoodMask() {
 104         return instance().ZAddressGoodMask();
 105     }
 106 
 107     public static long ZAddressBadMask() {
 108         return instance().ZAddressBadMask();
 109     }
 110 
 111     public static long ZAddressWeakBadMask() {
 112         return instance().ZAddressWeakBadMask();
 113     }
 114 
 115     public static int ZObjectAlignmentSmallShift() {
 116         return instance().ZObjectAlignmentSmallShift();
 117     }
 118 
 119     public static int ZObjectAlignmentSmall() {
 120         return instance().ZObjectAlignmentSmall();
 121     }
 122 }