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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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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package com.oracle.svm.core.graal.thread;

import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.nodeinfo.NodeCycles;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodeinfo.NodeSize;
import org.graalvm.compiler.nodes.ConstantNode;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.calc.AddNode;
import org.graalvm.compiler.nodes.calc.FloatingNode;
import org.graalvm.compiler.nodes.spi.Lowerable;
import org.graalvm.compiler.nodes.spi.LoweringTool;

import com.oracle.svm.core.FrameAccess;
import com.oracle.svm.core.graal.nodes.FloatingWordCastNode;
import com.oracle.svm.core.threadlocal.VMThreadLocalInfo;

import jdk.vm.ci.meta.JavaKind;

@NodeInfo(cycles = NodeCycles.CYCLES_1, size = NodeSize.SIZE_1)
public class AddressOfVMThreadLocalNode extends FloatingNode implements VMThreadLocalAccess, Lowerable {
    public static final NodeClass<AddressOfVMThreadLocalNode> TYPE = NodeClass.create(AddressOfVMThreadLocalNode.class);

    protected final VMThreadLocalInfo threadLocalInfo;
    @Input protected ValueNode holder;

    public AddressOfVMThreadLocalNode(VMThreadLocalInfo threadLocalInfo, ValueNode holder) {
        super(TYPE, FrameAccess.getWordStamp());
        this.threadLocalInfo = threadLocalInfo;
        this.holder = holder;
    }

    @Override
    public void lower(LoweringTool tool) {
        assert threadLocalInfo.offset >= 0;

        ValueNode base = holder;
        if (base.getStackKind() == JavaKind.Object) {
            base = graph().unique(new FloatingWordCastNode(FrameAccess.getWordStamp(), base));
        }
        assert base.getStackKind() == FrameAccess.getWordKind();

        ConstantNode offset = ConstantNode.forIntegerKind(FrameAccess.getWordKind(), threadLocalInfo.offset, graph());
        ValueNode address = graph().unique(new AddNode(base, offset));
        replaceAtUsagesAndDelete(address);
    }
}
