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 * Copyright (c) 2011, 2020, 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.
 *
 * 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.nodes.memory;

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

import org.graalvm.compiler.core.common.type.Stamp;
import org.graalvm.compiler.core.common.type.StampFactory;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.nodeinfo.InputType;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.FrameState;
import org.graalvm.compiler.nodes.NodeView;
import org.graalvm.compiler.nodes.StateSplit;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.extended.GuardingNode;
import org.graalvm.compiler.nodes.memory.address.AddressNode;
import jdk.internal.vm.compiler.word.LocationIdentity;

@NodeInfo(allowedUsageTypes = {InputType.Memory, InputType.Guard}, cycles = CYCLES_2, size = SIZE_1)
public abstract class AbstractWriteNode extends FixedAccessNode implements StateSplit, SingleMemoryKill, GuardingNode {

    public static final NodeClass<AbstractWriteNode> TYPE = NodeClass.create(AbstractWriteNode.class);
    @Input ValueNode value;
    @OptionalInput(InputType.State) FrameState stateAfter;

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

    @Override
    public void setStateAfter(FrameState x) {
        assert x == null || x.isAlive() : "frame state must be in a graph";
        updateUsages(stateAfter, x);
        stateAfter = x;
    }

    @Override
    public boolean hasSideEffect() {
        return true;
    }

    public ValueNode value() {
        return value;
    }

    protected AbstractWriteNode(NodeClass<? extends AbstractWriteNode> c, AddressNode address, LocationIdentity location, ValueNode value, BarrierType barrierType) {
        super(c, address, location, StampFactory.forVoid(), barrierType);
        this.value = value;
    }

    @Override
    public boolean isAllowedUsageType(InputType type) {
        return (type == InputType.Guard && getNullCheck()) ? true : super.isAllowedUsageType(type);
    }

    public abstract Stamp getAccessStamp(NodeView view);
}