/*

 * Copyright (c) 2017, 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

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 */

package sun.jvm.hotspot.gc.z;

import java.io.PrintStream;

import sun.jvm.hotspot.debugger.Address;

import sun.jvm.hotspot.debugger.OopHandle;

import sun.jvm.hotspot.gc.shared.CollectedHeap;

import sun.jvm.hotspot.gc.shared.CollectedHeapName;

import sun.jvm.hotspot.runtime.VM;

import sun.jvm.hotspot.runtime.VMObjectFactory;

import sun.jvm.hotspot.types.Type;

import sun.jvm.hotspot.types.TypeDataBase;

// Mirror class for ZCollectedHeap.

public class ZCollectedHeap extends CollectedHeap {

    private static long zHeapFieldOffset;

    static {

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

    }

    private static synchronized void initialize(TypeDataBase db) {

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

        zHeapFieldOffset = type.getAddressField("_heap").getOffset();

    }

    public ZHeap heap() {

        Address heapAddr = addr.addOffsetTo(zHeapFieldOffset);

        return (ZHeap)VMObjectFactory.newObject(ZHeap.class, heapAddr);

    }

    @Override

    public CollectedHeapName kind() {

        return CollectedHeapName.Z;

    }

    @Override

    public void printOn(PrintStream tty) {

        heap().printOn(tty);

    }

    public ZCollectedHeap(Address addr) {

        super(addr);

    }

    public OopHandle oop_load_at(OopHandle handle, long offset) {

        assert(!VM.getVM().isCompressedOopsEnabled());

        Address oopAddress = handle.getAddressAt(offset);

        oopAddress = ZBarrier.weak_barrier(oopAddress);

        if (oopAddress == null) {

            return null;

        }

        return oopAddress.addOffsetToAsOopHandle(0);

    }

    public String oopAddressDescription(OopHandle handle) {

        Address origOop = ZOop.to_address(handle);

        Address loadBarrieredOop = ZBarrier.weak_barrier(origOop);

        if (!origOop.equals(loadBarrieredOop)) {

            return origOop + " (" + loadBarrieredOop.toString() + ")";

        } else {

            return handle.toString();

        }

    }

}