/*
 * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package org.graalvm.compiler.nodes;

import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;

import org.graalvm.compiler.api.replacements.Snippet;
import org.graalvm.compiler.core.common.LIRKind;
import org.graalvm.compiler.core.common.type.StampFactory;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.spi.LIRLowerable;
import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;

import jdk.vm.ci.meta.AllocatableValue;
import jdk.vm.ci.meta.JavaKind;

/**
 * Intrinsification for getting the address of an object. The code path(s) between a call to
 * {@link #get(Object)} and all uses of the returned value must not contain safepoints. This can
 * only be guaranteed if used in a snippet that is instantiated after frame state assignment.
 * {@link ComputeObjectAddressNode} should generally be used in preference to this node.
 */
@NodeInfo(cycles = CYCLES_2, size = SIZE_1)
public final class GetObjectAddressNode extends FixedWithNextNode implements LIRLowerable {
    public static final NodeClass<GetObjectAddressNode> TYPE = NodeClass.create(GetObjectAddressNode.class);

    @Input ValueNode object;

    public GetObjectAddressNode(ValueNode obj) {
        super(TYPE, StampFactory.forKind(JavaKind.Long));
        this.object = obj;
    }

    @NodeIntrinsic
    public static native long get(Object array);

    @Override
    public void generate(NodeLIRBuilderTool gen) {
        AllocatableValue obj = gen.getLIRGeneratorTool().newVariable(LIRKind.unknownReference(gen.getLIRGeneratorTool().target().arch.getWordKind()));
        gen.getLIRGeneratorTool().emitMove(obj, gen.operand(object));
        gen.setResult(this, obj);
    }

    @Override
    public boolean verify() {
        assert graph().getGuardsStage().areFrameStatesAtDeopts() || graph().method().getAnnotation(Snippet.class) != null : "GetObjectAddressNode can't be used directly until frame states are fixed";
        return super.verify();
    }
}
