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The GraalVM compiler and the Graal-truffle optimizer.
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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
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 * 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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package org.graalvm.compiler.nodes.gc;

import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_64;
import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_64;

import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.nodeinfo.InputType;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.DeoptimizingNode;
import org.graalvm.compiler.nodes.FrameState;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.memory.address.AddressNode;

@NodeInfo(cycles = CYCLES_64, size = SIZE_64)
public final class G1PreWriteBarrier extends ObjectWriteBarrier implements DeoptimizingNode.DeoptBefore {

    public static final NodeClass TYPE = NodeClass.create(G1PreWriteBarrier.class);

    @OptionalInput(InputType.State) private FrameState stateBefore;
    private final boolean nullCheck;
    private final boolean doLoad;

    public G1PreWriteBarrier(AddressNode address, ValueNode expectedObject, boolean doLoad, boolean nullCheck) {
        super(TYPE, address, expectedObject, true);
        assert doLoad == (expectedObject == null);
        this.doLoad = doLoad;
        this.nullCheck = nullCheck;
    }

    public ValueNode getExpectedObject() {
        return getValue();
    }

    public boolean doLoad() {
        return doLoad;
    }

    public boolean getNullCheck() {
        return nullCheck;
    }

    @Override
    public boolean canDeoptimize() {
        return nullCheck;
    }

    @Override
    public FrameState stateBefore() {
        return stateBefore;
    }

    @Override
    public void setStateBefore(FrameState state) {
        updateUsages(stateBefore, state);
        stateBefore = state;
    }

    @Override
    public Kind getKind() {
        return Kind.PRE_BARRIER;
    }
}