JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package sun.jvm.hotspot.gc.z;

import sun.jvm.hotspot.debugger.Address;
import sun.jvm.hotspot.runtime.VM;
import sun.jvm.hotspot.runtime.VMObject;
import sun.jvm.hotspot.types.AddressField;
import sun.jvm.hotspot.types.Type;
import sun.jvm.hotspot.types.TypeDataBase;

class ZGlobalsForVMStructs extends VMObject {
    private static AddressField ZGlobalPhaseField;
    private static AddressField ZGlobalSeqNumField;
    private static AddressField ZAddressGoodMaskField;
    private static AddressField ZAddressBadMaskField;
    private static AddressField ZAddressWeakBadMaskField;
    private static AddressField ZObjectAlignmentSmallShiftField;
    private static AddressField ZObjectAlignmentSmallField;

    static {
        VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
    }

    static private synchronized void initialize(TypeDataBase db) {
        Type type = db.lookupType("ZGlobalsForVMStructs");

        ZGlobalPhaseField = type.getAddressField("_ZGlobalPhase");
        ZGlobalSeqNumField = type.getAddressField("_ZGlobalSeqNum");
        ZAddressGoodMaskField = type.getAddressField("_ZAddressGoodMask");
        ZAddressBadMaskField = type.getAddressField("_ZAddressBadMask");
        ZAddressWeakBadMaskField = type.getAddressField("_ZAddressWeakBadMask");
        ZObjectAlignmentSmallShiftField = type.getAddressField("_ZObjectAlignmentSmallShift");
        ZObjectAlignmentSmallField = type.getAddressField("_ZObjectAlignmentSmall");
    }

    ZGlobalsForVMStructs(Address addr) {
        super(addr);
    }

    int ZGlobalPhase() {
        return ZGlobalPhaseField.getValue(addr).getJIntAt(0);
    }

    int ZGlobalSeqNum() {
        return ZGlobalSeqNumField.getValue(addr).getJIntAt(0);
    }

    long ZAddressGoodMask() {
        return ZAddressGoodMaskField.getValue(addr).getJLongAt(0);
    }

    long ZAddressBadMask() {
        return ZAddressBadMaskField.getValue(addr).getJLongAt(0);
    }


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