1 /*

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

     3  * Copyright (c) 2019, Red Hat Inc. All rights reserved.

     4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     5  *

     6  * This code is free software; you can redistribute it and/or modify it

     7  * under the terms of the GNU General Public License version 2 only, as

     8  * published by the Free Software Foundation.

     9  *

    10  * This code is distributed in the hope that it will be useful, but WITHOUT

    11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    13  * version 2 for more details (a copy is included in the LICENSE file that

    14  * accompanied this code).

    15  *

    16  * You should have received a copy of the GNU General Public License version

    17  * 2 along with this work; if not, write to the Free Software Foundation,

    18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    19  *

    20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    21  * or visit www.oracle.com if you need additional information or have any

    22  * questions.

    23  */

    24 

    25 

    26 

    27 package org.graalvm.compiler.phases.common;

    28 

    29 import org.graalvm.compiler.nodes.StructuredGraph;

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

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

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

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

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

    35 import org.graalvm.compiler.phases.Phase;

    36 

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

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

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

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

    41 

    42 public class InsertMembarsPhase extends Phase {

    43     @Override

    44     protected void run(StructuredGraph graph) {

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

    46             if (access instanceof VolatileReadNode) {

    47                 ReadNode read = (ReadNode) access;

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

    49                 graph.addBeforeFixed(read, preMembar);

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

    51                 graph.addAfterFixed(read, postMembar);

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

    53                 WriteNode write = (WriteNode) access;

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

    55                 graph.addBeforeFixed(write, preMembar);

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

    57                 graph.addAfterFixed(write, postMembar);

    58             }

    59         }

    60     }

    61 

    62     @Override

    63     public float codeSizeIncrease() {

    64         return 3f;

    65     }

    66 }