/*

 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2019, Red Hat Inc. 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

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 */

package org.graalvm.compiler.phases.common;

import org.graalvm.compiler.nodes.StructuredGraph;

import org.graalvm.compiler.nodes.extended.MembarNode;

import org.graalvm.compiler.nodes.memory.FixedAccessNode;

import org.graalvm.compiler.nodes.memory.ReadNode;

import org.graalvm.compiler.nodes.memory.VolatileReadNode;

import org.graalvm.compiler.nodes.memory.WriteNode;

import org.graalvm.compiler.phases.Phase;

import static jdk.vm.ci.code.MemoryBarriers.JMM_POST_VOLATILE_READ;

import static jdk.vm.ci.code.MemoryBarriers.JMM_POST_VOLATILE_WRITE;

import static jdk.vm.ci.code.MemoryBarriers.JMM_PRE_VOLATILE_READ;

import static jdk.vm.ci.code.MemoryBarriers.JMM_PRE_VOLATILE_WRITE;

public class InsertMembarsPhase extends Phase {

    @Override

    protected void run(StructuredGraph graph) {

        for (FixedAccessNode access : graph.getNodes(FixedAccessNode.TYPE)) {

            if (access instanceof VolatileReadNode) {

                ReadNode read = (ReadNode) access;

                MembarNode preMembar = graph.add(new MembarNode(JMM_PRE_VOLATILE_READ));

                graph.addBeforeFixed(read, preMembar);

                MembarNode postMembar = graph.add(new MembarNode(JMM_POST_VOLATILE_READ));

                graph.addAfterFixed(read, postMembar);

            } else if (access instanceof WriteNode && ((WriteNode) access).isVolatile()) {

                WriteNode write = (WriteNode) access;

                MembarNode preMembar = graph.add(new MembarNode(JMM_PRE_VOLATILE_WRITE));

                graph.addBeforeFixed(write, preMembar);

                MembarNode postMembar = graph.add(new MembarNode(JMM_POST_VOLATILE_WRITE));

                graph.addAfterFixed(write, postMembar);

            }

        }

    }

    @Override

    public float codeSizeIncrease() {

        return 3f;

    }

}