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The GraalVM compiler and the Graal-truffle optimizer.
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/*
 * Copyright (c) 2016, 2022, 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.replacements.nodes;

import jdk.graal.compiler.core.common.type.IntegerStamp;
import jdk.graal.compiler.graph.Node;
import jdk.graal.compiler.graph.NodeClass;
import jdk.graal.compiler.nodeinfo.NodeInfo;
import jdk.graal.compiler.nodes.AbstractStateSplit;
import jdk.graal.compiler.nodes.ConstantNode;
import jdk.graal.compiler.nodes.DeoptBciSupplier;
import jdk.graal.compiler.nodes.ValueNode;
import jdk.graal.compiler.nodes.memory.SingleMemoryKill;
import jdk.graal.compiler.nodes.spi.Canonicalizable;
import jdk.graal.compiler.nodes.spi.CanonicalizerTool;
import jdk.graal.compiler.nodes.spi.CoreProviders;
import jdk.graal.compiler.nodes.spi.Lowerable;

@NodeInfo
public abstract class IdentityHashCodeNode extends AbstractStateSplit implements Canonicalizable, Lowerable, SingleMemoryKill, DeoptBciSupplier {

    public static final NodeClass TYPE = NodeClass.create(IdentityHashCodeNode.class);

    @Input ValueNode object;
    private int bci;

    protected IdentityHashCodeNode(NodeClass c, ValueNode object, int bci) {
        super(c, IntegerStamp.create(32));
        this.object = object;
        this.bci = bci;
    }

    public ValueNode object() {
        return object;
    }

    @Override
    public int bci() {
        return bci;
    }

    @Override
    public void setBci(int bci) {
        this.bci = bci;
    }

    @Override
    public Node canonical(CanonicalizerTool tool) {
        ValueNode result = canonical(object, tool);
        return result != null ? result : this;
    }

    protected static ValueNode canonical(ValueNode object, CoreProviders providers) {
        if (object.isJavaConstant()) {
            Integer identityHashCode = providers.getIdentityHashCodeProvider().identityHashCode(object.asJavaConstant());
            if (identityHashCode != null) {
                return ConstantNode.forInt(identityHashCode);
            }
        }
        return null;
    }
}