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The GraalVM compiler and the Graal-truffle optimizer.
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/*
 * Copyright (c) 2019, 2020, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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,
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package jdk.graal.compiler.nodes;

import jdk.graal.compiler.core.common.type.StampFactory;
import jdk.graal.compiler.graph.NodeClass;
import jdk.graal.compiler.nodeinfo.InputType;
import jdk.graal.compiler.nodeinfo.NodeInfo;
import jdk.graal.compiler.nodes.memory.MemoryKill;
import jdk.graal.compiler.nodes.memory.MemoryPhiNode;
import jdk.graal.compiler.nodes.memory.SingleMemoryKill;
import org.graalvm.word.LocationIdentity;

@NodeInfo(allowedUsageTypes = {InputType.Memory}, nameTemplate = "MemoryProxy({i#value})")
public final class MemoryProxyNode extends ProxyNode implements SingleMemoryKill {

    public static final NodeClass TYPE = NodeClass.create(MemoryProxyNode.class);
    @OptionalInput(InputType.Memory) MemoryKill value;
    protected final LocationIdentity locationIdentity;

    public MemoryProxyNode(MemoryKill value, LoopExitNode proxyPoint, LocationIdentity locationIdentity) {
        super(TYPE, StampFactory.forVoid(), proxyPoint);
        this.value = value;
        this.locationIdentity = locationIdentity;
    }

    @Override
    public ValueNode value() {
        return (value == null ? null : value.asNode());
    }

    @Override
    public PhiNode createPhi(AbstractMergeNode merge) {
        return graph().addWithoutUnique(new MemoryPhiNode(merge, locationIdentity));
    }

    @Override
    public LocationIdentity getKilledLocationIdentity() {
        return locationIdentity;
    }

    @Override
    public ProxyNode duplicateOn(LoopExitNode newProxyPoint, ValueNode newOriginalNode) {
        assert MemoryKill.isMemoryKill(newOriginalNode);
        return graph().addWithoutUniqueWithInputs(new MemoryProxyNode((MemoryKill) newOriginalNode, newProxyPoint, getKilledLocationIdentity()));
    }
}