/*
 * Copyright (c) 2011, 2015, 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 com.oracle.graal.nodes.extended;

import com.oracle.graal.compiler.common.type.*;
import com.oracle.graal.graph.*;
import com.oracle.graal.nodeinfo.*;
import com.oracle.graal.nodes.*;
import com.oracle.graal.nodes.memory.*;
import com.oracle.graal.nodes.spi.*;
import com.oracle.jvmci.meta.*;

/**
 * Creates a memory barrier.
 */
@NodeInfo(allowedUsageTypes = {InputType.Memory})
public final class MembarNode extends FixedWithNextNode implements LIRLowerable, MemoryCheckpoint.Single {

    public static final NodeClass<MembarNode> TYPE = NodeClass.create(MembarNode.class);
    protected final int barriers;
    protected final LocationIdentity location;

    public MembarNode(int barriers) {
        this(barriers, LocationIdentity.any());
    }

    public MembarNode(int barriers, LocationIdentity location) {
        super(TYPE, StampFactory.forVoid());
        this.barriers = barriers;
        this.location = location;
    }

    @Override
    public LocationIdentity getLocationIdentity() {
        return location;
    }

    @Override
    public void generate(NodeLIRBuilderTool generator) {
        generator.getLIRGeneratorTool().emitMembar(barriers);
    }

    @NodeIntrinsic
    public static native void memoryBarrier(@ConstantNodeParameter int barriers);

    @NodeIntrinsic
    public static native void memoryBarrier(@ConstantNodeParameter int barriers, @ConstantNodeParameter LocationIdentity location);
}