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.nodes.memory;

    28 

    29 import org.graalvm.compiler.core.common.GraalOptions;

    30 import org.graalvm.compiler.core.common.type.Stamp;

    31 import org.graalvm.compiler.graph.NodeClass;

    32 import org.graalvm.compiler.nodeinfo.NodeInfo;

    33 import org.graalvm.compiler.nodes.memory.address.AddressNode;

    34 import jdk.internal.vm.compiler.word.LocationIdentity;

    35 

    36 import static org.graalvm.compiler.nodeinfo.InputType.Memory;

    37 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;

    38 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;

    39 

    40 @NodeInfo(nameTemplate = "Read#{p#location/s}", allowedUsageTypes = Memory, cycles = CYCLES_2, size = SIZE_1)

    41 public class VolatileReadNode extends ReadNode implements MemoryCheckpoint.Single {

    42     public static final NodeClass<VolatileReadNode> TYPE = NodeClass.create(VolatileReadNode.class);

    43 

    44     public VolatileReadNode(AddressNode address, LocationIdentity location, Stamp stamp, BarrierType barrierType) {

    45         super(TYPE, address, location, stamp, null, barrierType, false, null);

    46         assert GraalOptions.LateMembars.getValue(address.getOptions());

    47     }

    48 

    49     @SuppressWarnings("try")

    50     @Override

    51     public FloatingAccessNode asFloatingNode() {

    52         throw new RuntimeException();

    53     }

    54 

    55     @Override

    56     public boolean canFloat() {

    57         return false;

    58     }

    59 

    60     @Override

    61     public LocationIdentity getKilledLocationIdentity() {

    62         return LocationIdentity.any();

    63     }

    64 

    65     @Override

    66     public boolean canNullCheck() {

    67         return false;

    68     }

    69 

    70 }