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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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 * published by the Free Software Foundation.  Oracle designates this
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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 jdk.graal.compiler.phases.common;

import java.util.Objects;
import java.util.Optional;

import jdk.graal.compiler.core.common.GraalOptions;
import jdk.graal.compiler.graph.Graph.NodeEventScope;
import jdk.graal.compiler.nodes.GraphState;
import jdk.graal.compiler.nodes.StructuredGraph;
import jdk.graal.compiler.nodes.spi.CoreProviders;
import jdk.graal.compiler.phases.BasePhase;
import jdk.graal.compiler.phases.common.util.EconomicSetNodeEventListener;

public class IterativeConditionalEliminationPhase extends BasePhase {
    private final boolean fullSchedule;
    private final ConditionalEliminationPhase conditionalEliminationPhase;

    public IterativeConditionalEliminationPhase(CanonicalizerPhase canonicalizer, boolean fullSchedule) {
        this.fullSchedule = fullSchedule;
        this.conditionalEliminationPhase = new ConditionalEliminationPhase(canonicalizer, fullSchedule);
    }

    @Override
    public Optional notApplicableTo(GraphState graphState) {
        return conditionalEliminationPhase.notApplicableTo(graphState);
    }

    @Override
    @SuppressWarnings("try")
    protected void run(StructuredGraph graph, CoreProviders context) {
        final int maxIterations = GraalOptions.ConditionalEliminationMaxIterations.getValue(graph.getOptions());
        EconomicSetNodeEventListener listener = new EconomicSetNodeEventListener();
        for (int count = 0; count < maxIterations; ++count) {
            try (NodeEventScope nes = graph.trackNodeEvents(listener)) {
                conditionalEliminationPhase.apply(graph, context);
            }
            if (listener.getNodes().isEmpty()) {
                break;
            }
            listener.getNodes().clear();
        }
    }

    @Override
    public float codeSizeIncrease() {
        return 2.0f;
    }

    @Override
    public int hashCode() {
        return Objects.hash(this.getClass().getName(), fullSchedule, conditionalEliminationPhase);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        if (!(obj instanceof IterativeConditionalEliminationPhase)) {
            return false;
        }

        IterativeConditionalEliminationPhase that = (IterativeConditionalEliminationPhase) obj;

        return this.getClass().equals(that.getClass()) &&
                        this.fullSchedule == that.fullSchedule &&
                        this.conditionalEliminationPhase.equals(that.conditionalEliminationPhase);
    }
}