1 /*

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

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

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

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

    21  * questions.

    22  */

    23 

    24 

    25 package org.graalvm.compiler.nodes;

    26 

    27 import org.graalvm.compiler.core.common.type.StampFactory;

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

    29 import org.graalvm.compiler.nodeinfo.InputType;

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

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

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

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

    34 

    35 @NodeInfo(allowedUsageTypes = {InputType.Memory}, nameTemplate = "MemoryProxy({i#value})")

    36 public final class MemoryProxyNode extends ProxyNode implements MemoryNode {

    37 

    38     public static final NodeClass<MemoryProxyNode> TYPE = NodeClass.create(MemoryProxyNode.class);

    39     @OptionalInput(InputType.Memory) MemoryNode value;

    40     protected final LocationIdentity locationIdentity;

    41 

    42     public MemoryProxyNode(MemoryNode value, LoopExitNode proxyPoint, LocationIdentity locationIdentity) {

    43         super(TYPE, StampFactory.forVoid(), proxyPoint);

    44         this.value = value;

    45         this.locationIdentity = locationIdentity;

    46     }

    47 

    48     public void setValue(MemoryNode newValue) {

    49         this.updateUsages(value.asNode(), newValue.asNode());

    50         this.value = newValue;

    51     }

    52 

    53     @Override

    54     public ValueNode value() {

    55         return (value == null ? null : value.asNode());

    56     }

    57 

    58     @Override

    59     public PhiNode createPhi(AbstractMergeNode merge) {

    60         return graph().addWithoutUnique(new MemoryPhiNode(merge, locationIdentity));

    61     }

    62 }