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The GraalVM compiler and the Graal-truffle optimizer.
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/*
 * Copyright (c) 2012, 2018, 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).
 *
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 * 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.hotspot.nodes;

import static jdk.graal.compiler.nodeinfo.NodeCycles.CYCLES_2;
import static jdk.graal.compiler.nodeinfo.NodeSize.SIZE_1;

import jdk.graal.compiler.core.common.type.StampFactory;
import jdk.graal.compiler.graph.NodeClass;
import jdk.graal.compiler.hotspot.HotSpotLIRGenerator;
import jdk.graal.compiler.lir.VirtualStackSlot;
import jdk.graal.compiler.nodeinfo.NodeInfo;
import jdk.graal.compiler.nodes.FixedWithNextNode;
import jdk.graal.compiler.nodes.spi.LIRLowerable;
import jdk.graal.compiler.nodes.spi.NodeLIRBuilderTool;
import jdk.graal.compiler.word.Word;
import jdk.graal.compiler.word.WordTypes;

import jdk.vm.ci.meta.Value;

/**
 * Intrinsic for getting the lock in the current {@linkplain BeginLockScopeNode lock scope}.
 */
@NodeInfo(cycles = CYCLES_2, size = SIZE_1)
public final class CurrentLockNode extends FixedWithNextNode implements LIRLowerable {
    public static final NodeClass TYPE = NodeClass.create(CurrentLockNode.class);

    protected int lockDepth;

    public CurrentLockNode(@InjectedNodeParameter WordTypes wordTypes, int lockDepth) {
        super(TYPE, StampFactory.forKind(wordTypes.getWordKind()));
        this.lockDepth = lockDepth;
    }

    @Override
    public void generate(NodeLIRBuilderTool gen) {
        assert lockDepth != -1;
        HotSpotLIRGenerator hsGen = (HotSpotLIRGenerator) gen.getLIRGeneratorTool();
        VirtualStackSlot slot = hsGen.getLockSlot(lockDepth);
        // The register allocator cannot handle stack -> register moves so we use an LEA here
        Value result = gen.getLIRGeneratorTool().emitAddress(slot);
        gen.setResult(this, result);
    }

    @NodeIntrinsic
    public static native Word currentLock(@ConstantNodeParameter int lockDepth);
}