/*

 * Copyright (c) 2019, 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

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 */

package org.graalvm.compiler.nodes;

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

import org.graalvm.compiler.graph.NodeClass;

import org.graalvm.compiler.nodeinfo.InputType;

import org.graalvm.compiler.nodeinfo.NodeInfo;

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

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

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

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

public final class MemoryProxyNode extends ProxyNode implements MemoryNode {

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

    @OptionalInput(InputType.Memory) MemoryNode value;

    protected final LocationIdentity locationIdentity;

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

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

        this.value = value;

        this.locationIdentity = locationIdentity;

    }

    public void setValue(MemoryNode newValue) {

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

        this.value = newValue;

    }

    @Override

    public ValueNode value() {

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

    }

    @Override

    public PhiNode createPhi(AbstractMergeNode merge) {

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

    }

}