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 }