--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZGlobals.java	Tue Jun 12 17:40:28 2018 +0200
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2018, 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.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+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();
+    }
+}