--- /dev/null 2018-04-03 12:55:20.301839954 +0200 +++ new/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZVirtualMemory.java 2018-06-08 19:46:58.875398801 +0200 @@ -0,0 +1,60 @@ +/* + * 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.debugger.Address; +import sun.jvm.hotspot.runtime.VM; +import sun.jvm.hotspot.runtime.VMObject; +import sun.jvm.hotspot.types.CIntegerField; +import sun.jvm.hotspot.types.Type; +import sun.jvm.hotspot.types.TypeDataBase; + +public class ZVirtualMemory extends VMObject { + private static CIntegerField startField; + private static CIntegerField endField; + + static { + VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase())); + } + + static private synchronized void initialize(TypeDataBase db) { + Type type = db.lookupType("ZVirtualMemory"); + + startField = type.getCIntegerField("_start"); + endField = type.getCIntegerField("_end"); + } + + public ZVirtualMemory(Address addr) { + super(addr); + } + + long start() { + return startField.getJLong(addr); + } + + long end() { + return endField.getJLong(addr); + } +}