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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.
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 * 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.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * 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.phases.common;

import static org.graalvm.compiler.core.common.GraalOptions.GenLoopSafepoints;

import java.util.Optional;

import org.graalvm.compiler.debug.DebugCloseable;
import org.graalvm.compiler.nodes.GraphState;
import org.graalvm.compiler.nodes.GraphState.StageFlag;
import org.graalvm.compiler.nodes.LoopBeginNode;
import org.graalvm.compiler.nodes.LoopEndNode;
import org.graalvm.compiler.nodes.SafepointNode;
import org.graalvm.compiler.nodes.StructuredGraph;
import org.graalvm.compiler.phases.BasePhase;
import org.graalvm.compiler.phases.tiers.MidTierContext;

/**
 * Adds safepoints to loops.
 */
public class LoopSafepointInsertionPhase extends BasePhase {

    @Override
    public boolean checkContract() {
        // the size / cost after is highly dynamic and dependent on the graph, thus we do not verify
        // costs for this phase
        return false;
    }

    @Override
    public Optional notApplicableTo(GraphState graphState) {
        return NotApplicable.ifAny(
                        NotApplicable.ifApplied(this, StageFlag.SAFEPOINTS_INSERTION, graphState),
                        NotApplicable.unlessRunBefore(this, StageFlag.FSA, graphState));
    }

    @Override
    @SuppressWarnings("try")
    protected void run(StructuredGraph graph, MidTierContext context) {
        if (GenLoopSafepoints.getValue(graph.getOptions())) {
            for (LoopBeginNode loopBeginNode : graph.getNodes(LoopBeginNode.TYPE)) {
                for (LoopEndNode loopEndNode : loopBeginNode.loopEnds()) {
                    if (loopEndNode.canSafepoint()) {
                        try (DebugCloseable s = loopEndNode.withNodeSourcePosition()) {
                            SafepointNode safepointNode = graph.add(new SafepointNode());
                            graph.addBeforeFixed(loopEndNode, safepointNode);
                        }
                    }
                }
            }
        }
    }

    @Override
    public void updateGraphState(GraphState graphState) {
        super.updateGraphState(graphState);
        graphState.setAfterStage(StageFlag.SAFEPOINTS_INSERTION);
    }
}