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 * 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.runtime.VM;

import sun.jvm.hotspot.types.Field;

import sun.jvm.hotspot.types.Type;

import sun.jvm.hotspot.types.TypeDataBase;

public class ZGlobals {

    private static Field instanceField;

    // Global phase state

    public static int ZPhaseRelocate;

    public static byte ZPageTypeSmall;

    public static byte ZPageTypeMedium;

    public static byte ZPageTypeLarge;

    // Page size shifts

    public static long ZPageSizeSmallShift;

    public static long ZPageSizeMediumShift;

    public static long ZPageSizeMinShift;

    // Object alignment shifts

    public static int  ZObjectAlignmentMediumShift;

    public static int  ZObjectAlignmentLargeShift;

    // Pointer part of address

    public static long ZAddressOffsetShift;

    // Pointer part of address

    public static long ZAddressOffsetBits;

    public static long ZAddressOffsetMask;

    // Address space start/end/size

    public static long ZAddressSpaceStart;

    static {

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

    }

    static private synchronized void initialize(TypeDataBase db) {

        Type type = db.lookupType("ZGlobalsForVMStructs");

        instanceField = type.getField("_instance_p");

        ZPhaseRelocate = db.lookupIntConstant("ZPhaseRelocate").intValue();

        ZPageTypeSmall = db.lookupIntConstant("ZPageTypeSmall").byteValue();

        ZPageTypeMedium = db.lookupIntConstant("ZPageTypeMedium").byteValue();

        ZPageTypeLarge = db.lookupIntConstant("ZPageTypeLarge").byteValue();

        ZPageSizeSmallShift = db.lookupLongConstant("ZPageSizeSmallShift").longValue();

        ZPageSizeMediumShift = db.lookupLongConstant("ZPageSizeMediumShift").longValue();

        ZPageSizeMinShift = db.lookupLongConstant("ZPageSizeMinShift").longValue();

        ZObjectAlignmentMediumShift = db.lookupIntConstant("ZObjectAlignmentMediumShift").intValue();

        ZObjectAlignmentLargeShift = db.lookupIntConstant("ZObjectAlignmentLargeShift").intValue();;

        ZAddressOffsetShift = db.lookupLongConstant("ZAddressOffsetShift").longValue();

        ZAddressOffsetBits = db.lookupLongConstant("ZAddressOffsetBits").longValue();

        ZAddressOffsetMask = db.lookupLongConstant("ZAddressOffsetMask").longValue();

        ZAddressSpaceStart = db.lookupLongConstant("ZAddressSpaceStart").longValue();

    }

    private static ZGlobalsForVMStructs instance() {

        return new ZGlobalsForVMStructs(instanceField.getAddress());

    }

    public static int ZGlobalPhase() {

        return instance().ZGlobalPhase();

    }

    public static long ZAddressGoodMask() {

        return instance().ZAddressGoodMask();

    }

    public static long ZAddressBadMask() {

        return instance().ZAddressBadMask();

    }

    public static long ZAddressWeakBadMask() {

        return instance().ZAddressWeakBadMask();

    }

    public static int ZObjectAlignmentSmallShift() {

        return instance().ZObjectAlignmentSmallShift();

    }

    public static int ZObjectAlignmentSmall() {

        return instance().ZObjectAlignmentSmall();

    }

}