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The GraalVM compiler and the Graal-truffle optimizer.
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/*
 * Copyright (c) 2014, 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,
 * 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 jdk.graal.compiler.nodes.java;

import static jdk.graal.compiler.nodeinfo.InputType.Memory;
import static jdk.graal.compiler.nodeinfo.NodeCycles.CYCLES_8;
import static jdk.graal.compiler.nodeinfo.NodeSize.SIZE_2;

import org.graalvm.word.LocationIdentity;

import jdk.graal.compiler.core.common.type.StampFactory;
import jdk.graal.compiler.graph.NodeClass;
import jdk.graal.compiler.nodeinfo.NodeInfo;
import jdk.graal.compiler.nodes.ValueNode;
import jdk.graal.compiler.nodes.memory.AbstractMemoryCheckpoint;
import jdk.graal.compiler.nodes.memory.SingleMemoryKill;
import jdk.graal.compiler.nodes.spi.Lowerable;
import jdk.graal.compiler.nodes.spi.TrackedUnsafeAccess;
import jdk.vm.ci.meta.JavaKind;

/**
 * Represents an atomic read-and-add operation like
 * {@code sun.misc.Unsafe.getAndAddInt(Object, long, int)}.
 */
@NodeInfo(allowedUsageTypes = Memory, cycles = CYCLES_8, size = SIZE_2)
public final class AtomicReadAndAddNode extends AbstractMemoryCheckpoint implements Lowerable, SingleMemoryKill, TrackedUnsafeAccess {

    public static final NodeClass TYPE = NodeClass.create(AtomicReadAndAddNode.class);
    @Input ValueNode object;
    @Input ValueNode offset;
    @Input ValueNode delta;
    /**
     * We explicitly track the kind of this node instead of using {#delta.getStackKind()} to be able
     * to emit the memory access instruction with the correct number of bits.
     */
    private JavaKind valueKind;

    protected final LocationIdentity locationIdentity;

    public AtomicReadAndAddNode(ValueNode object, ValueNode offset, ValueNode delta, JavaKind valueKind, LocationIdentity locationIdentity) {
        super(TYPE, StampFactory.forKind(valueKind));
        this.object = object;
        this.offset = offset;
        this.delta = delta;
        this.valueKind = valueKind;
        this.locationIdentity = locationIdentity;
    }

    public ValueNode object() {
        return object;
    }

    public ValueNode offset() {
        return offset;
    }

    public ValueNode delta() {
        return delta;
    }

    public JavaKind getValueKind() {
        return valueKind;
    }

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