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 * 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.

 *

 * 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.

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package org.graalvm.compiler.hotspot.nodes.aot;

import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_4;

import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;

import org.graalvm.compiler.core.common.PermanentBailoutException;

import org.graalvm.compiler.graph.Node;

import org.graalvm.compiler.graph.NodeClass;

import org.graalvm.compiler.graph.spi.Canonicalizable;

import org.graalvm.compiler.graph.spi.CanonicalizerTool;

import org.graalvm.compiler.hotspot.HotSpotLIRGenerator;

import org.graalvm.compiler.hotspot.meta.HotSpotConstantLoadAction;

import org.graalvm.compiler.hotspot.word.KlassPointer;

import org.graalvm.compiler.nodeinfo.NodeInfo;

import org.graalvm.compiler.nodes.NodeView;

import org.graalvm.compiler.nodes.ValueNode;

import org.graalvm.compiler.nodes.calc.FloatingNode;

import org.graalvm.compiler.nodes.spi.LIRLowerable;

import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;

import org.graalvm.compiler.nodes.util.GraphUtil;

import jdk.vm.ci.hotspot.HotSpotMetaspaceConstant;

import jdk.vm.ci.hotspot.HotSpotObjectConstant;

import jdk.vm.ci.meta.Constant;

import jdk.vm.ci.meta.Value;

@NodeInfo(cycles = CYCLES_4, size = SIZE_1)

public class LoadConstantIndirectlyNode extends FloatingNode implements Canonicalizable, LIRLowerable {

    public static final NodeClass<LoadConstantIndirectlyNode> TYPE = NodeClass.create(LoadConstantIndirectlyNode.class);

    @OptionalInput protected ValueNode value;

    protected Constant constant;

    protected HotSpotConstantLoadAction action;

    public LoadConstantIndirectlyNode(ValueNode value) {

        super(TYPE, value.stamp(NodeView.DEFAULT));

        this.value = value;

        this.constant = null;

        this.action = HotSpotConstantLoadAction.RESOLVE;

    }

    public LoadConstantIndirectlyNode(ValueNode value, HotSpotConstantLoadAction action) {

        super(TYPE, value.stamp(NodeView.DEFAULT));

        this.value = value;

        this.constant = null;

        this.action = action;

    }

    @Override

    public Node canonical(CanonicalizerTool tool) {

        if (value != null) {

            constant = GraphUtil.foldIfConstantAndRemove(this, value);

        }

        return this;

    }

    @Override

    public void generate(NodeLIRBuilderTool gen) {

        assert constant != null : "Expected the value to fold: " + value;

        Value result;

            result = ((HotSpotLIRGenerator) gen.getLIRGeneratorTool()).emitLoadObjectAddress(constant);

        } else if (constant instanceof HotSpotMetaspaceConstant) {

            result = ((HotSpotLIRGenerator) gen.getLIRGeneratorTool()).emitLoadMetaspaceAddress(constant, action);

        } else {

            throw new PermanentBailoutException("Unsupported constant type: " + constant);

        }

        gen.setResult(this, result);

    }

    @NodeIntrinsic

    public static native KlassPointer loadKlass(KlassPointer klassPointer, @ConstantNodeParameter HotSpotConstantLoadAction action);

    @NodeIntrinsic

    public static native KlassPointer loadKlass(KlassPointer klassPointer);

    @NodeIntrinsic

    public static native Object loadObject(Object object);

}