/*
 * Copyright (c) 2009, 2018, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 *
 *
 *
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 *
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 *
 *
 *
 *
 *
 */


package org.graalvm.compiler.nodes;

import java.util.Map;

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.graph.NodeInputList;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.type.StampTool;
import org.graalvm.util.CollectionsUtil;

/**
 * Value {@link PhiNode}s merge data flow values at control flow merges.
 */
@NodeInfo(nameTemplate = "Phi({i#values}, {p#valueDescription})")
public class ValuePhiNode extends PhiNode {

    public static final NodeClass<ValuePhiNode> TYPE = NodeClass.create(ValuePhiNode.class);
    @Input protected NodeInputList<ValueNode> values;

    public ValuePhiNode(Stamp stamp, AbstractMergeNode merge) {
        this(TYPE, stamp, merge);
    }

    protected ValuePhiNode(NodeClass<? extends ValuePhiNode> c, Stamp stamp, AbstractMergeNode merge) {
        super(c, stamp, merge);
        assert stamp != StampFactory.forVoid();
        values = new NodeInputList<>(this);
    }

    public ValuePhiNode(Stamp stamp, AbstractMergeNode merge, ValueNode[] values) {
        super(TYPE, stamp, merge);
        assert stamp != StampFactory.forVoid();
        this.values = new NodeInputList<>(this, values);
    }

    @Override
    public NodeInputList<ValueNode> values() {
        return values;
    }

    @Override
    public boolean inferStamp() {
        /*
         * Meet all the values feeding this Phi but don't use the stamp of this Phi since that's
         * what's being computed.
         */
        Stamp valuesStamp = StampTool.meetOrNull(values(), this);
        if (valuesStamp == null) {
            valuesStamp = stamp;
        } else if (stamp.isCompatible(valuesStamp)) {
            valuesStamp = stamp.join(valuesStamp);
        }
        return updateStamp(valuesStamp);
    }

    @Override
    public boolean verify() {
        Stamp s = null;
        for (ValueNode input : values()) {
            assert input != null;
            if (s == null) {
                s = input.stamp(NodeView.DEFAULT);
            } else {
                if (!s.isCompatible(input.stamp(NodeView.DEFAULT))) {
                    fail("Phi Input Stamps are not compatible. Phi:%s inputs:%s", this,
                                    CollectionsUtil.mapAndJoin(values(), x -> x.toString() + ":" + x.stamp(NodeView.DEFAULT), ", "));
                }
            }
        }
        return super.verify();
    }

    @Override
    protected String valueDescription() {
        return stamp(NodeView.DEFAULT).unrestricted().toString();
    }

    @Override
    public Map<Object, Object> getDebugProperties(Map<Object, Object> map) {
        Map<Object, Object> properties = super.getDebugProperties(map);
        properties.put("valueDescription", valueDescription());
        return properties;
    }
}
